Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Olaf Weber | 3e57ecf | 2006-06-09 14:48:12 +1000 | [diff] [blame] | 2 | * Copyright (c) 2000-2006 Silicon Graphics, Inc. |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 3 | * All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License as |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * published by the Free Software Foundation. |
| 8 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 9 | * This program is distributed in the hope that it would be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write the Free Software Foundation, |
| 16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include "xfs.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 19 | #include "xfs_fs.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include "xfs_types.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 21 | #include "xfs_bit.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include "xfs_log.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 23 | #include "xfs_inum.h" |
| 24 | #include "xfs_imap.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include "xfs_trans.h" |
| 26 | #include "xfs_trans_priv.h" |
| 27 | #include "xfs_sb.h" |
| 28 | #include "xfs_ag.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include "xfs_dir2.h" |
| 30 | #include "xfs_dmapi.h" |
| 31 | #include "xfs_mount.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include "xfs_bmap_btree.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 33 | #include "xfs_alloc_btree.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include "xfs_ialloc_btree.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include "xfs_dir2_sf.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 36 | #include "xfs_attr_sf.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include "xfs_dinode.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include "xfs_inode.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include "xfs_buf_item.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 40 | #include "xfs_inode_item.h" |
| 41 | #include "xfs_btree.h" |
| 42 | #include "xfs_alloc.h" |
| 43 | #include "xfs_ialloc.h" |
| 44 | #include "xfs_bmap.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include "xfs_rw.h" |
| 46 | #include "xfs_error.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include "xfs_utils.h" |
| 48 | #include "xfs_dir2_trace.h" |
| 49 | #include "xfs_quota.h" |
| 50 | #include "xfs_mac.h" |
| 51 | #include "xfs_acl.h" |
| 52 | |
| 53 | |
| 54 | kmem_zone_t *xfs_ifork_zone; |
| 55 | kmem_zone_t *xfs_inode_zone; |
| 56 | kmem_zone_t *xfs_chashlist_zone; |
| 57 | |
| 58 | /* |
| 59 | * Used in xfs_itruncate(). This is the maximum number of extents |
| 60 | * freed from a file in a single transaction. |
| 61 | */ |
| 62 | #define XFS_ITRUNC_MAX_EXTENTS 2 |
| 63 | |
| 64 | STATIC int xfs_iflush_int(xfs_inode_t *, xfs_buf_t *); |
| 65 | STATIC int xfs_iformat_local(xfs_inode_t *, xfs_dinode_t *, int, int); |
| 66 | STATIC int xfs_iformat_extents(xfs_inode_t *, xfs_dinode_t *, int); |
| 67 | STATIC int xfs_iformat_btree(xfs_inode_t *, xfs_dinode_t *, int); |
| 68 | |
| 69 | |
| 70 | #ifdef DEBUG |
| 71 | /* |
| 72 | * Make sure that the extents in the given memory buffer |
| 73 | * are valid. |
| 74 | */ |
| 75 | STATIC void |
| 76 | xfs_validate_extents( |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 77 | xfs_ifork_t *ifp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | int nrecs, |
| 79 | int disk, |
| 80 | xfs_exntfmt_t fmt) |
| 81 | { |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 82 | xfs_bmbt_rec_t *ep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | xfs_bmbt_irec_t irec; |
| 84 | xfs_bmbt_rec_t rec; |
| 85 | int i; |
| 86 | |
| 87 | for (i = 0; i < nrecs; i++) { |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 88 | ep = xfs_iext_get_ext(ifp, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | rec.l0 = get_unaligned((__uint64_t*)&ep->l0); |
| 90 | rec.l1 = get_unaligned((__uint64_t*)&ep->l1); |
| 91 | if (disk) |
| 92 | xfs_bmbt_disk_get_all(&rec, &irec); |
| 93 | else |
| 94 | xfs_bmbt_get_all(&rec, &irec); |
| 95 | if (fmt == XFS_EXTFMT_NOSTATE) |
| 96 | ASSERT(irec.br_state == XFS_EXT_NORM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | } |
| 98 | } |
| 99 | #else /* DEBUG */ |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 100 | #define xfs_validate_extents(ifp, nrecs, disk, fmt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | #endif /* DEBUG */ |
| 102 | |
| 103 | /* |
| 104 | * Check that none of the inode's in the buffer have a next |
| 105 | * unlinked field of 0. |
| 106 | */ |
| 107 | #if defined(DEBUG) |
| 108 | void |
| 109 | xfs_inobp_check( |
| 110 | xfs_mount_t *mp, |
| 111 | xfs_buf_t *bp) |
| 112 | { |
| 113 | int i; |
| 114 | int j; |
| 115 | xfs_dinode_t *dip; |
| 116 | |
| 117 | j = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog; |
| 118 | |
| 119 | for (i = 0; i < j; i++) { |
| 120 | dip = (xfs_dinode_t *)xfs_buf_offset(bp, |
| 121 | i * mp->m_sb.sb_inodesize); |
| 122 | if (!dip->di_next_unlinked) { |
| 123 | xfs_fs_cmn_err(CE_ALERT, mp, |
| 124 | "Detected a bogus zero next_unlinked field in incore inode buffer 0x%p. About to pop an ASSERT.", |
| 125 | bp); |
| 126 | ASSERT(dip->di_next_unlinked); |
| 127 | } |
| 128 | } |
| 129 | } |
| 130 | #endif |
| 131 | |
| 132 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | * This routine is called to map an inode number within a file |
| 134 | * system to the buffer containing the on-disk version of the |
| 135 | * inode. It returns a pointer to the buffer containing the |
| 136 | * on-disk inode in the bpp parameter, and in the dip parameter |
| 137 | * it returns a pointer to the on-disk inode within that buffer. |
| 138 | * |
| 139 | * If a non-zero error is returned, then the contents of bpp and |
| 140 | * dipp are undefined. |
| 141 | * |
| 142 | * Use xfs_imap() to determine the size and location of the |
| 143 | * buffer to read from disk. |
| 144 | */ |
Christoph Hellwig | ba0f32d | 2005-06-21 15:36:52 +1000 | [diff] [blame] | 145 | STATIC int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | xfs_inotobp( |
| 147 | xfs_mount_t *mp, |
| 148 | xfs_trans_t *tp, |
| 149 | xfs_ino_t ino, |
| 150 | xfs_dinode_t **dipp, |
| 151 | xfs_buf_t **bpp, |
| 152 | int *offset) |
| 153 | { |
| 154 | int di_ok; |
| 155 | xfs_imap_t imap; |
| 156 | xfs_buf_t *bp; |
| 157 | int error; |
| 158 | xfs_dinode_t *dip; |
| 159 | |
| 160 | /* |
Nathan Scott | c41564b | 2006-03-29 08:55:14 +1000 | [diff] [blame] | 161 | * Call the space management code to find the location of the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | * inode on disk. |
| 163 | */ |
| 164 | imap.im_blkno = 0; |
| 165 | error = xfs_imap(mp, tp, ino, &imap, XFS_IMAP_LOOKUP); |
| 166 | if (error != 0) { |
| 167 | cmn_err(CE_WARN, |
| 168 | "xfs_inotobp: xfs_imap() returned an " |
| 169 | "error %d on %s. Returning error.", error, mp->m_fsname); |
| 170 | return error; |
| 171 | } |
| 172 | |
| 173 | /* |
| 174 | * If the inode number maps to a block outside the bounds of the |
| 175 | * file system then return NULL rather than calling read_buf |
| 176 | * and panicing when we get an error from the driver. |
| 177 | */ |
| 178 | if ((imap.im_blkno + imap.im_len) > |
| 179 | XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)) { |
| 180 | cmn_err(CE_WARN, |
Christoph Hellwig | da1650a | 2005-11-02 10:21:35 +1100 | [diff] [blame] | 181 | "xfs_inotobp: inode number (%llu + %d) maps to a block outside the bounds " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | "of the file system %s. Returning EINVAL.", |
Christoph Hellwig | da1650a | 2005-11-02 10:21:35 +1100 | [diff] [blame] | 183 | (unsigned long long)imap.im_blkno, |
| 184 | imap.im_len, mp->m_fsname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | return XFS_ERROR(EINVAL); |
| 186 | } |
| 187 | |
| 188 | /* |
| 189 | * Read in the buffer. If tp is NULL, xfs_trans_read_buf() will |
| 190 | * default to just a read_buf() call. |
| 191 | */ |
| 192 | error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap.im_blkno, |
| 193 | (int)imap.im_len, XFS_BUF_LOCK, &bp); |
| 194 | |
| 195 | if (error) { |
| 196 | cmn_err(CE_WARN, |
| 197 | "xfs_inotobp: xfs_trans_read_buf() returned an " |
| 198 | "error %d on %s. Returning error.", error, mp->m_fsname); |
| 199 | return error; |
| 200 | } |
| 201 | dip = (xfs_dinode_t *)xfs_buf_offset(bp, 0); |
| 202 | di_ok = |
| 203 | INT_GET(dip->di_core.di_magic, ARCH_CONVERT) == XFS_DINODE_MAGIC && |
| 204 | XFS_DINODE_GOOD_VERSION(INT_GET(dip->di_core.di_version, ARCH_CONVERT)); |
| 205 | if (unlikely(XFS_TEST_ERROR(!di_ok, mp, XFS_ERRTAG_ITOBP_INOTOBP, |
| 206 | XFS_RANDOM_ITOBP_INOTOBP))) { |
| 207 | XFS_CORRUPTION_ERROR("xfs_inotobp", XFS_ERRLEVEL_LOW, mp, dip); |
| 208 | xfs_trans_brelse(tp, bp); |
| 209 | cmn_err(CE_WARN, |
| 210 | "xfs_inotobp: XFS_TEST_ERROR() returned an " |
| 211 | "error on %s. Returning EFSCORRUPTED.", mp->m_fsname); |
| 212 | return XFS_ERROR(EFSCORRUPTED); |
| 213 | } |
| 214 | |
| 215 | xfs_inobp_check(mp, bp); |
| 216 | |
| 217 | /* |
| 218 | * Set *dipp to point to the on-disk inode in the buffer. |
| 219 | */ |
| 220 | *dipp = (xfs_dinode_t *)xfs_buf_offset(bp, imap.im_boffset); |
| 221 | *bpp = bp; |
| 222 | *offset = imap.im_boffset; |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | |
| 227 | /* |
| 228 | * This routine is called to map an inode to the buffer containing |
| 229 | * the on-disk version of the inode. It returns a pointer to the |
| 230 | * buffer containing the on-disk inode in the bpp parameter, and in |
| 231 | * the dip parameter it returns a pointer to the on-disk inode within |
| 232 | * that buffer. |
| 233 | * |
| 234 | * If a non-zero error is returned, then the contents of bpp and |
| 235 | * dipp are undefined. |
| 236 | * |
| 237 | * If the inode is new and has not yet been initialized, use xfs_imap() |
| 238 | * to determine the size and location of the buffer to read from disk. |
| 239 | * If the inode has already been mapped to its buffer and read in once, |
| 240 | * then use the mapping information stored in the inode rather than |
| 241 | * calling xfs_imap(). This allows us to avoid the overhead of looking |
| 242 | * at the inode btree for small block file systems (see xfs_dilocate()). |
| 243 | * We can tell whether the inode has been mapped in before by comparing |
| 244 | * its disk block address to 0. Only uninitialized inodes will have |
| 245 | * 0 for the disk block address. |
| 246 | */ |
| 247 | int |
| 248 | xfs_itobp( |
| 249 | xfs_mount_t *mp, |
| 250 | xfs_trans_t *tp, |
| 251 | xfs_inode_t *ip, |
| 252 | xfs_dinode_t **dipp, |
| 253 | xfs_buf_t **bpp, |
Nathan Scott | b12dd34 | 2006-03-17 17:26:04 +1100 | [diff] [blame] | 254 | xfs_daddr_t bno, |
| 255 | uint imap_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | { |
Nathan Scott | 4d1a2ed | 2006-06-09 17:12:28 +1000 | [diff] [blame] | 257 | xfs_imap_t imap; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | xfs_buf_t *bp; |
| 259 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | int i; |
| 261 | int ni; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | |
| 263 | if (ip->i_blkno == (xfs_daddr_t)0) { |
| 264 | /* |
| 265 | * Call the space management code to find the location of the |
| 266 | * inode on disk. |
| 267 | */ |
| 268 | imap.im_blkno = bno; |
Nathan Scott | b12dd34 | 2006-03-17 17:26:04 +1100 | [diff] [blame] | 269 | if ((error = xfs_imap(mp, tp, ip->i_ino, &imap, |
| 270 | XFS_IMAP_LOOKUP | imap_flags))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
| 273 | /* |
| 274 | * If the inode number maps to a block outside the bounds |
| 275 | * of the file system then return NULL rather than calling |
| 276 | * read_buf and panicing when we get an error from the |
| 277 | * driver. |
| 278 | */ |
| 279 | if ((imap.im_blkno + imap.im_len) > |
| 280 | XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)) { |
| 281 | #ifdef DEBUG |
| 282 | xfs_fs_cmn_err(CE_ALERT, mp, "xfs_itobp: " |
| 283 | "(imap.im_blkno (0x%llx) " |
| 284 | "+ imap.im_len (0x%llx)) > " |
| 285 | " XFS_FSB_TO_BB(mp, " |
| 286 | "mp->m_sb.sb_dblocks) (0x%llx)", |
| 287 | (unsigned long long) imap.im_blkno, |
| 288 | (unsigned long long) imap.im_len, |
| 289 | XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks)); |
| 290 | #endif /* DEBUG */ |
| 291 | return XFS_ERROR(EINVAL); |
| 292 | } |
| 293 | |
| 294 | /* |
| 295 | * Fill in the fields in the inode that will be used to |
| 296 | * map the inode to its buffer from now on. |
| 297 | */ |
| 298 | ip->i_blkno = imap.im_blkno; |
| 299 | ip->i_len = imap.im_len; |
| 300 | ip->i_boffset = imap.im_boffset; |
| 301 | } else { |
| 302 | /* |
| 303 | * We've already mapped the inode once, so just use the |
| 304 | * mapping that we saved the first time. |
| 305 | */ |
| 306 | imap.im_blkno = ip->i_blkno; |
| 307 | imap.im_len = ip->i_len; |
| 308 | imap.im_boffset = ip->i_boffset; |
| 309 | } |
| 310 | ASSERT(bno == 0 || bno == imap.im_blkno); |
| 311 | |
| 312 | /* |
| 313 | * Read in the buffer. If tp is NULL, xfs_trans_read_buf() will |
| 314 | * default to just a read_buf() call. |
| 315 | */ |
| 316 | error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap.im_blkno, |
| 317 | (int)imap.im_len, XFS_BUF_LOCK, &bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | if (error) { |
| 319 | #ifdef DEBUG |
| 320 | xfs_fs_cmn_err(CE_ALERT, mp, "xfs_itobp: " |
| 321 | "xfs_trans_read_buf() returned error %d, " |
| 322 | "imap.im_blkno 0x%llx, imap.im_len 0x%llx", |
| 323 | error, (unsigned long long) imap.im_blkno, |
| 324 | (unsigned long long) imap.im_len); |
| 325 | #endif /* DEBUG */ |
| 326 | return error; |
| 327 | } |
Nathan Scott | 4d1a2ed | 2006-06-09 17:12:28 +1000 | [diff] [blame] | 328 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | /* |
| 330 | * Validate the magic number and version of every inode in the buffer |
| 331 | * (if DEBUG kernel) or the first inode in the buffer, otherwise. |
Nathan Scott | 4d1a2ed | 2006-06-09 17:12:28 +1000 | [diff] [blame] | 332 | * No validation is done here in userspace (xfs_repair). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | */ |
Nathan Scott | 4d1a2ed | 2006-06-09 17:12:28 +1000 | [diff] [blame] | 334 | #if !defined(__KERNEL__) |
| 335 | ni = 0; |
| 336 | #elif defined(DEBUG) |
Nathan Scott | 41ff715 | 2006-07-28 17:05:51 +1000 | [diff] [blame] | 337 | ni = BBTOB(imap.im_len) >> mp->m_sb.sb_inodelog; |
Nathan Scott | 4d1a2ed | 2006-06-09 17:12:28 +1000 | [diff] [blame] | 338 | #else /* usual case */ |
Nathan Scott | 41ff715 | 2006-07-28 17:05:51 +1000 | [diff] [blame] | 339 | ni = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | #endif |
Nathan Scott | 4d1a2ed | 2006-06-09 17:12:28 +1000 | [diff] [blame] | 341 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | for (i = 0; i < ni; i++) { |
| 343 | int di_ok; |
| 344 | xfs_dinode_t *dip; |
| 345 | |
| 346 | dip = (xfs_dinode_t *)xfs_buf_offset(bp, |
| 347 | (i << mp->m_sb.sb_inodelog)); |
| 348 | di_ok = INT_GET(dip->di_core.di_magic, ARCH_CONVERT) == XFS_DINODE_MAGIC && |
| 349 | XFS_DINODE_GOOD_VERSION(INT_GET(dip->di_core.di_version, ARCH_CONVERT)); |
Nathan Scott | 41ff715 | 2006-07-28 17:05:51 +1000 | [diff] [blame] | 350 | if (unlikely(XFS_TEST_ERROR(!di_ok, mp, |
| 351 | XFS_ERRTAG_ITOBP_INOTOBP, |
| 352 | XFS_RANDOM_ITOBP_INOTOBP))) { |
| 353 | if (imap_flags & XFS_IMAP_BULKSTAT) { |
| 354 | xfs_trans_brelse(tp, bp); |
| 355 | return XFS_ERROR(EINVAL); |
| 356 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | #ifdef DEBUG |
Nathan Scott | 41ff715 | 2006-07-28 17:05:51 +1000 | [diff] [blame] | 358 | cmn_err(CE_ALERT, |
Nathan Scott | 4d1a2ed | 2006-06-09 17:12:28 +1000 | [diff] [blame] | 359 | "Device %s - bad inode magic/vsn " |
| 360 | "daddr %lld #%d (magic=%x)", |
Nathan Scott | b657452 | 2006-06-09 15:29:40 +1000 | [diff] [blame] | 361 | XFS_BUFTARG_NAME(mp->m_ddev_targp), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | (unsigned long long)imap.im_blkno, i, |
| 363 | INT_GET(dip->di_core.di_magic, ARCH_CONVERT)); |
| 364 | #endif |
| 365 | XFS_CORRUPTION_ERROR("xfs_itobp", XFS_ERRLEVEL_HIGH, |
| 366 | mp, dip); |
| 367 | xfs_trans_brelse(tp, bp); |
| 368 | return XFS_ERROR(EFSCORRUPTED); |
| 369 | } |
| 370 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | |
| 372 | xfs_inobp_check(mp, bp); |
| 373 | |
| 374 | /* |
| 375 | * Mark the buffer as an inode buffer now that it looks good |
| 376 | */ |
| 377 | XFS_BUF_SET_VTYPE(bp, B_FS_INO); |
| 378 | |
| 379 | /* |
| 380 | * Set *dipp to point to the on-disk inode in the buffer. |
| 381 | */ |
| 382 | *dipp = (xfs_dinode_t *)xfs_buf_offset(bp, imap.im_boffset); |
| 383 | *bpp = bp; |
| 384 | return 0; |
| 385 | } |
| 386 | |
| 387 | /* |
| 388 | * Move inode type and inode format specific information from the |
| 389 | * on-disk inode to the in-core inode. For fifos, devs, and sockets |
| 390 | * this means set if_rdev to the proper value. For files, directories, |
| 391 | * and symlinks this means to bring in the in-line data or extent |
| 392 | * pointers. For a file in B-tree format, only the root is immediately |
| 393 | * brought in-core. The rest will be in-lined in if_extents when it |
| 394 | * is first referenced (see xfs_iread_extents()). |
| 395 | */ |
| 396 | STATIC int |
| 397 | xfs_iformat( |
| 398 | xfs_inode_t *ip, |
| 399 | xfs_dinode_t *dip) |
| 400 | { |
| 401 | xfs_attr_shortform_t *atp; |
| 402 | int size; |
| 403 | int error; |
| 404 | xfs_fsize_t di_size; |
| 405 | ip->i_df.if_ext_max = |
| 406 | XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t); |
| 407 | error = 0; |
| 408 | |
| 409 | if (unlikely( |
| 410 | INT_GET(dip->di_core.di_nextents, ARCH_CONVERT) + |
| 411 | INT_GET(dip->di_core.di_anextents, ARCH_CONVERT) > |
| 412 | INT_GET(dip->di_core.di_nblocks, ARCH_CONVERT))) { |
Nathan Scott | 3762ec6 | 2006-01-12 10:29:53 +1100 | [diff] [blame] | 413 | xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount, |
| 414 | "corrupt dinode %Lu, extent total = %d, nblocks = %Lu.", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | (unsigned long long)ip->i_ino, |
| 416 | (int)(INT_GET(dip->di_core.di_nextents, ARCH_CONVERT) |
| 417 | + INT_GET(dip->di_core.di_anextents, ARCH_CONVERT)), |
| 418 | (unsigned long long) |
| 419 | INT_GET(dip->di_core.di_nblocks, ARCH_CONVERT)); |
| 420 | XFS_CORRUPTION_ERROR("xfs_iformat(1)", XFS_ERRLEVEL_LOW, |
| 421 | ip->i_mount, dip); |
| 422 | return XFS_ERROR(EFSCORRUPTED); |
| 423 | } |
| 424 | |
| 425 | if (unlikely(INT_GET(dip->di_core.di_forkoff, ARCH_CONVERT) > ip->i_mount->m_sb.sb_inodesize)) { |
Nathan Scott | 3762ec6 | 2006-01-12 10:29:53 +1100 | [diff] [blame] | 426 | xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount, |
| 427 | "corrupt dinode %Lu, forkoff = 0x%x.", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | (unsigned long long)ip->i_ino, |
| 429 | (int)(INT_GET(dip->di_core.di_forkoff, ARCH_CONVERT))); |
| 430 | XFS_CORRUPTION_ERROR("xfs_iformat(2)", XFS_ERRLEVEL_LOW, |
| 431 | ip->i_mount, dip); |
| 432 | return XFS_ERROR(EFSCORRUPTED); |
| 433 | } |
| 434 | |
| 435 | switch (ip->i_d.di_mode & S_IFMT) { |
| 436 | case S_IFIFO: |
| 437 | case S_IFCHR: |
| 438 | case S_IFBLK: |
| 439 | case S_IFSOCK: |
| 440 | if (unlikely(INT_GET(dip->di_core.di_format, ARCH_CONVERT) != XFS_DINODE_FMT_DEV)) { |
| 441 | XFS_CORRUPTION_ERROR("xfs_iformat(3)", XFS_ERRLEVEL_LOW, |
| 442 | ip->i_mount, dip); |
| 443 | return XFS_ERROR(EFSCORRUPTED); |
| 444 | } |
| 445 | ip->i_d.di_size = 0; |
| 446 | ip->i_df.if_u2.if_rdev = INT_GET(dip->di_u.di_dev, ARCH_CONVERT); |
| 447 | break; |
| 448 | |
| 449 | case S_IFREG: |
| 450 | case S_IFLNK: |
| 451 | case S_IFDIR: |
| 452 | switch (INT_GET(dip->di_core.di_format, ARCH_CONVERT)) { |
| 453 | case XFS_DINODE_FMT_LOCAL: |
| 454 | /* |
| 455 | * no local regular files yet |
| 456 | */ |
| 457 | if (unlikely((INT_GET(dip->di_core.di_mode, ARCH_CONVERT) & S_IFMT) == S_IFREG)) { |
Nathan Scott | 3762ec6 | 2006-01-12 10:29:53 +1100 | [diff] [blame] | 458 | xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount, |
| 459 | "corrupt inode %Lu " |
| 460 | "(local format for regular file).", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | (unsigned long long) ip->i_ino); |
| 462 | XFS_CORRUPTION_ERROR("xfs_iformat(4)", |
| 463 | XFS_ERRLEVEL_LOW, |
| 464 | ip->i_mount, dip); |
| 465 | return XFS_ERROR(EFSCORRUPTED); |
| 466 | } |
| 467 | |
| 468 | di_size = INT_GET(dip->di_core.di_size, ARCH_CONVERT); |
| 469 | if (unlikely(di_size > XFS_DFORK_DSIZE(dip, ip->i_mount))) { |
Nathan Scott | 3762ec6 | 2006-01-12 10:29:53 +1100 | [diff] [blame] | 470 | xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount, |
| 471 | "corrupt inode %Lu " |
| 472 | "(bad size %Ld for local inode).", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | (unsigned long long) ip->i_ino, |
| 474 | (long long) di_size); |
| 475 | XFS_CORRUPTION_ERROR("xfs_iformat(5)", |
| 476 | XFS_ERRLEVEL_LOW, |
| 477 | ip->i_mount, dip); |
| 478 | return XFS_ERROR(EFSCORRUPTED); |
| 479 | } |
| 480 | |
| 481 | size = (int)di_size; |
| 482 | error = xfs_iformat_local(ip, dip, XFS_DATA_FORK, size); |
| 483 | break; |
| 484 | case XFS_DINODE_FMT_EXTENTS: |
| 485 | error = xfs_iformat_extents(ip, dip, XFS_DATA_FORK); |
| 486 | break; |
| 487 | case XFS_DINODE_FMT_BTREE: |
| 488 | error = xfs_iformat_btree(ip, dip, XFS_DATA_FORK); |
| 489 | break; |
| 490 | default: |
| 491 | XFS_ERROR_REPORT("xfs_iformat(6)", XFS_ERRLEVEL_LOW, |
| 492 | ip->i_mount); |
| 493 | return XFS_ERROR(EFSCORRUPTED); |
| 494 | } |
| 495 | break; |
| 496 | |
| 497 | default: |
| 498 | XFS_ERROR_REPORT("xfs_iformat(7)", XFS_ERRLEVEL_LOW, ip->i_mount); |
| 499 | return XFS_ERROR(EFSCORRUPTED); |
| 500 | } |
| 501 | if (error) { |
| 502 | return error; |
| 503 | } |
| 504 | if (!XFS_DFORK_Q(dip)) |
| 505 | return 0; |
| 506 | ASSERT(ip->i_afp == NULL); |
| 507 | ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP); |
| 508 | ip->i_afp->if_ext_max = |
| 509 | XFS_IFORK_ASIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t); |
| 510 | switch (INT_GET(dip->di_core.di_aformat, ARCH_CONVERT)) { |
| 511 | case XFS_DINODE_FMT_LOCAL: |
| 512 | atp = (xfs_attr_shortform_t *)XFS_DFORK_APTR(dip); |
Nathan Scott | 3b244aa | 2006-03-17 17:29:25 +1100 | [diff] [blame] | 513 | size = be16_to_cpu(atp->hdr.totsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | error = xfs_iformat_local(ip, dip, XFS_ATTR_FORK, size); |
| 515 | break; |
| 516 | case XFS_DINODE_FMT_EXTENTS: |
| 517 | error = xfs_iformat_extents(ip, dip, XFS_ATTR_FORK); |
| 518 | break; |
| 519 | case XFS_DINODE_FMT_BTREE: |
| 520 | error = xfs_iformat_btree(ip, dip, XFS_ATTR_FORK); |
| 521 | break; |
| 522 | default: |
| 523 | error = XFS_ERROR(EFSCORRUPTED); |
| 524 | break; |
| 525 | } |
| 526 | if (error) { |
| 527 | kmem_zone_free(xfs_ifork_zone, ip->i_afp); |
| 528 | ip->i_afp = NULL; |
| 529 | xfs_idestroy_fork(ip, XFS_DATA_FORK); |
| 530 | } |
| 531 | return error; |
| 532 | } |
| 533 | |
| 534 | /* |
| 535 | * The file is in-lined in the on-disk inode. |
| 536 | * If it fits into if_inline_data, then copy |
| 537 | * it there, otherwise allocate a buffer for it |
| 538 | * and copy the data there. Either way, set |
| 539 | * if_data to point at the data. |
| 540 | * If we allocate a buffer for the data, make |
| 541 | * sure that its size is a multiple of 4 and |
| 542 | * record the real size in i_real_bytes. |
| 543 | */ |
| 544 | STATIC int |
| 545 | xfs_iformat_local( |
| 546 | xfs_inode_t *ip, |
| 547 | xfs_dinode_t *dip, |
| 548 | int whichfork, |
| 549 | int size) |
| 550 | { |
| 551 | xfs_ifork_t *ifp; |
| 552 | int real_size; |
| 553 | |
| 554 | /* |
| 555 | * If the size is unreasonable, then something |
| 556 | * is wrong and we just bail out rather than crash in |
| 557 | * kmem_alloc() or memcpy() below. |
| 558 | */ |
| 559 | if (unlikely(size > XFS_DFORK_SIZE(dip, ip->i_mount, whichfork))) { |
Nathan Scott | 3762ec6 | 2006-01-12 10:29:53 +1100 | [diff] [blame] | 560 | xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount, |
| 561 | "corrupt inode %Lu " |
| 562 | "(bad size %d for local fork, size = %d).", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | (unsigned long long) ip->i_ino, size, |
| 564 | XFS_DFORK_SIZE(dip, ip->i_mount, whichfork)); |
| 565 | XFS_CORRUPTION_ERROR("xfs_iformat_local", XFS_ERRLEVEL_LOW, |
| 566 | ip->i_mount, dip); |
| 567 | return XFS_ERROR(EFSCORRUPTED); |
| 568 | } |
| 569 | ifp = XFS_IFORK_PTR(ip, whichfork); |
| 570 | real_size = 0; |
| 571 | if (size == 0) |
| 572 | ifp->if_u1.if_data = NULL; |
| 573 | else if (size <= sizeof(ifp->if_u2.if_inline_data)) |
| 574 | ifp->if_u1.if_data = ifp->if_u2.if_inline_data; |
| 575 | else { |
| 576 | real_size = roundup(size, 4); |
| 577 | ifp->if_u1.if_data = kmem_alloc(real_size, KM_SLEEP); |
| 578 | } |
| 579 | ifp->if_bytes = size; |
| 580 | ifp->if_real_bytes = real_size; |
| 581 | if (size) |
| 582 | memcpy(ifp->if_u1.if_data, XFS_DFORK_PTR(dip, whichfork), size); |
| 583 | ifp->if_flags &= ~XFS_IFEXTENTS; |
| 584 | ifp->if_flags |= XFS_IFINLINE; |
| 585 | return 0; |
| 586 | } |
| 587 | |
| 588 | /* |
| 589 | * The file consists of a set of extents all |
| 590 | * of which fit into the on-disk inode. |
| 591 | * If there are few enough extents to fit into |
| 592 | * the if_inline_ext, then copy them there. |
| 593 | * Otherwise allocate a buffer for them and copy |
| 594 | * them into it. Either way, set if_extents |
| 595 | * to point at the extents. |
| 596 | */ |
| 597 | STATIC int |
| 598 | xfs_iformat_extents( |
| 599 | xfs_inode_t *ip, |
| 600 | xfs_dinode_t *dip, |
| 601 | int whichfork) |
| 602 | { |
| 603 | xfs_bmbt_rec_t *ep, *dp; |
| 604 | xfs_ifork_t *ifp; |
| 605 | int nex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | int size; |
| 607 | int i; |
| 608 | |
| 609 | ifp = XFS_IFORK_PTR(ip, whichfork); |
| 610 | nex = XFS_DFORK_NEXTENTS(dip, whichfork); |
| 611 | size = nex * (uint)sizeof(xfs_bmbt_rec_t); |
| 612 | |
| 613 | /* |
| 614 | * If the number of extents is unreasonable, then something |
| 615 | * is wrong and we just bail out rather than crash in |
| 616 | * kmem_alloc() or memcpy() below. |
| 617 | */ |
| 618 | if (unlikely(size < 0 || size > XFS_DFORK_SIZE(dip, ip->i_mount, whichfork))) { |
Nathan Scott | 3762ec6 | 2006-01-12 10:29:53 +1100 | [diff] [blame] | 619 | xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount, |
| 620 | "corrupt inode %Lu ((a)extents = %d).", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | (unsigned long long) ip->i_ino, nex); |
| 622 | XFS_CORRUPTION_ERROR("xfs_iformat_extents(1)", XFS_ERRLEVEL_LOW, |
| 623 | ip->i_mount, dip); |
| 624 | return XFS_ERROR(EFSCORRUPTED); |
| 625 | } |
| 626 | |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 627 | ifp->if_real_bytes = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | if (nex == 0) |
| 629 | ifp->if_u1.if_extents = NULL; |
| 630 | else if (nex <= XFS_INLINE_EXTS) |
| 631 | ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext; |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 632 | else |
| 633 | xfs_iext_add(ifp, 0, nex); |
| 634 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | ifp->if_bytes = size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | if (size) { |
| 637 | dp = (xfs_bmbt_rec_t *) XFS_DFORK_PTR(dip, whichfork); |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 638 | xfs_validate_extents(ifp, nex, 1, XFS_EXTFMT_INODE(ip)); |
| 639 | for (i = 0; i < nex; i++, dp++) { |
| 640 | ep = xfs_iext_get_ext(ifp, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | ep->l0 = INT_GET(get_unaligned((__uint64_t*)&dp->l0), |
| 642 | ARCH_CONVERT); |
| 643 | ep->l1 = INT_GET(get_unaligned((__uint64_t*)&dp->l1), |
| 644 | ARCH_CONVERT); |
| 645 | } |
| 646 | xfs_bmap_trace_exlist("xfs_iformat_extents", ip, nex, |
| 647 | whichfork); |
| 648 | if (whichfork != XFS_DATA_FORK || |
| 649 | XFS_EXTFMT_INODE(ip) == XFS_EXTFMT_NOSTATE) |
| 650 | if (unlikely(xfs_check_nostate_extents( |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 651 | ifp, 0, nex))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | XFS_ERROR_REPORT("xfs_iformat_extents(2)", |
| 653 | XFS_ERRLEVEL_LOW, |
| 654 | ip->i_mount); |
| 655 | return XFS_ERROR(EFSCORRUPTED); |
| 656 | } |
| 657 | } |
| 658 | ifp->if_flags |= XFS_IFEXTENTS; |
| 659 | return 0; |
| 660 | } |
| 661 | |
| 662 | /* |
| 663 | * The file has too many extents to fit into |
| 664 | * the inode, so they are in B-tree format. |
| 665 | * Allocate a buffer for the root of the B-tree |
| 666 | * and copy the root into it. The i_extents |
| 667 | * field will remain NULL until all of the |
| 668 | * extents are read in (when they are needed). |
| 669 | */ |
| 670 | STATIC int |
| 671 | xfs_iformat_btree( |
| 672 | xfs_inode_t *ip, |
| 673 | xfs_dinode_t *dip, |
| 674 | int whichfork) |
| 675 | { |
| 676 | xfs_bmdr_block_t *dfp; |
| 677 | xfs_ifork_t *ifp; |
| 678 | /* REFERENCED */ |
| 679 | int nrecs; |
| 680 | int size; |
| 681 | |
| 682 | ifp = XFS_IFORK_PTR(ip, whichfork); |
| 683 | dfp = (xfs_bmdr_block_t *)XFS_DFORK_PTR(dip, whichfork); |
| 684 | size = XFS_BMAP_BROOT_SPACE(dfp); |
| 685 | nrecs = XFS_BMAP_BROOT_NUMRECS(dfp); |
| 686 | |
| 687 | /* |
| 688 | * blow out if -- fork has less extents than can fit in |
| 689 | * fork (fork shouldn't be a btree format), root btree |
| 690 | * block has more records than can fit into the fork, |
| 691 | * or the number of extents is greater than the number of |
| 692 | * blocks. |
| 693 | */ |
| 694 | if (unlikely(XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max |
| 695 | || XFS_BMDR_SPACE_CALC(nrecs) > |
| 696 | XFS_DFORK_SIZE(dip, ip->i_mount, whichfork) |
| 697 | || XFS_IFORK_NEXTENTS(ip, whichfork) > ip->i_d.di_nblocks)) { |
Nathan Scott | 3762ec6 | 2006-01-12 10:29:53 +1100 | [diff] [blame] | 698 | xfs_fs_repair_cmn_err(CE_WARN, ip->i_mount, |
| 699 | "corrupt inode %Lu (btree).", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | (unsigned long long) ip->i_ino); |
| 701 | XFS_ERROR_REPORT("xfs_iformat_btree", XFS_ERRLEVEL_LOW, |
| 702 | ip->i_mount); |
| 703 | return XFS_ERROR(EFSCORRUPTED); |
| 704 | } |
| 705 | |
| 706 | ifp->if_broot_bytes = size; |
| 707 | ifp->if_broot = kmem_alloc(size, KM_SLEEP); |
| 708 | ASSERT(ifp->if_broot != NULL); |
| 709 | /* |
| 710 | * Copy and convert from the on-disk structure |
| 711 | * to the in-memory structure. |
| 712 | */ |
| 713 | xfs_bmdr_to_bmbt(dfp, XFS_DFORK_SIZE(dip, ip->i_mount, whichfork), |
| 714 | ifp->if_broot, size); |
| 715 | ifp->if_flags &= ~XFS_IFEXTENTS; |
| 716 | ifp->if_flags |= XFS_IFBROOT; |
| 717 | |
| 718 | return 0; |
| 719 | } |
| 720 | |
| 721 | /* |
| 722 | * xfs_xlate_dinode_core - translate an xfs_inode_core_t between ondisk |
| 723 | * and native format |
| 724 | * |
| 725 | * buf = on-disk representation |
| 726 | * dip = native representation |
| 727 | * dir = direction - +ve -> disk to native |
| 728 | * -ve -> native to disk |
| 729 | */ |
| 730 | void |
| 731 | xfs_xlate_dinode_core( |
| 732 | xfs_caddr_t buf, |
| 733 | xfs_dinode_core_t *dip, |
| 734 | int dir) |
| 735 | { |
| 736 | xfs_dinode_core_t *buf_core = (xfs_dinode_core_t *)buf; |
| 737 | xfs_dinode_core_t *mem_core = (xfs_dinode_core_t *)dip; |
| 738 | xfs_arch_t arch = ARCH_CONVERT; |
| 739 | |
| 740 | ASSERT(dir); |
| 741 | |
| 742 | INT_XLATE(buf_core->di_magic, mem_core->di_magic, dir, arch); |
| 743 | INT_XLATE(buf_core->di_mode, mem_core->di_mode, dir, arch); |
| 744 | INT_XLATE(buf_core->di_version, mem_core->di_version, dir, arch); |
| 745 | INT_XLATE(buf_core->di_format, mem_core->di_format, dir, arch); |
| 746 | INT_XLATE(buf_core->di_onlink, mem_core->di_onlink, dir, arch); |
| 747 | INT_XLATE(buf_core->di_uid, mem_core->di_uid, dir, arch); |
| 748 | INT_XLATE(buf_core->di_gid, mem_core->di_gid, dir, arch); |
| 749 | INT_XLATE(buf_core->di_nlink, mem_core->di_nlink, dir, arch); |
| 750 | INT_XLATE(buf_core->di_projid, mem_core->di_projid, dir, arch); |
| 751 | |
| 752 | if (dir > 0) { |
| 753 | memcpy(mem_core->di_pad, buf_core->di_pad, |
| 754 | sizeof(buf_core->di_pad)); |
| 755 | } else { |
| 756 | memcpy(buf_core->di_pad, mem_core->di_pad, |
| 757 | sizeof(buf_core->di_pad)); |
| 758 | } |
| 759 | |
| 760 | INT_XLATE(buf_core->di_flushiter, mem_core->di_flushiter, dir, arch); |
| 761 | |
| 762 | INT_XLATE(buf_core->di_atime.t_sec, mem_core->di_atime.t_sec, |
| 763 | dir, arch); |
| 764 | INT_XLATE(buf_core->di_atime.t_nsec, mem_core->di_atime.t_nsec, |
| 765 | dir, arch); |
| 766 | INT_XLATE(buf_core->di_mtime.t_sec, mem_core->di_mtime.t_sec, |
| 767 | dir, arch); |
| 768 | INT_XLATE(buf_core->di_mtime.t_nsec, mem_core->di_mtime.t_nsec, |
| 769 | dir, arch); |
| 770 | INT_XLATE(buf_core->di_ctime.t_sec, mem_core->di_ctime.t_sec, |
| 771 | dir, arch); |
| 772 | INT_XLATE(buf_core->di_ctime.t_nsec, mem_core->di_ctime.t_nsec, |
| 773 | dir, arch); |
| 774 | INT_XLATE(buf_core->di_size, mem_core->di_size, dir, arch); |
| 775 | INT_XLATE(buf_core->di_nblocks, mem_core->di_nblocks, dir, arch); |
| 776 | INT_XLATE(buf_core->di_extsize, mem_core->di_extsize, dir, arch); |
| 777 | INT_XLATE(buf_core->di_nextents, mem_core->di_nextents, dir, arch); |
| 778 | INT_XLATE(buf_core->di_anextents, mem_core->di_anextents, dir, arch); |
| 779 | INT_XLATE(buf_core->di_forkoff, mem_core->di_forkoff, dir, arch); |
| 780 | INT_XLATE(buf_core->di_aformat, mem_core->di_aformat, dir, arch); |
| 781 | INT_XLATE(buf_core->di_dmevmask, mem_core->di_dmevmask, dir, arch); |
| 782 | INT_XLATE(buf_core->di_dmstate, mem_core->di_dmstate, dir, arch); |
| 783 | INT_XLATE(buf_core->di_flags, mem_core->di_flags, dir, arch); |
| 784 | INT_XLATE(buf_core->di_gen, mem_core->di_gen, dir, arch); |
| 785 | } |
| 786 | |
| 787 | STATIC uint |
| 788 | _xfs_dic2xflags( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | __uint16_t di_flags) |
| 790 | { |
| 791 | uint flags = 0; |
| 792 | |
| 793 | if (di_flags & XFS_DIFLAG_ANY) { |
| 794 | if (di_flags & XFS_DIFLAG_REALTIME) |
| 795 | flags |= XFS_XFLAG_REALTIME; |
| 796 | if (di_flags & XFS_DIFLAG_PREALLOC) |
| 797 | flags |= XFS_XFLAG_PREALLOC; |
| 798 | if (di_flags & XFS_DIFLAG_IMMUTABLE) |
| 799 | flags |= XFS_XFLAG_IMMUTABLE; |
| 800 | if (di_flags & XFS_DIFLAG_APPEND) |
| 801 | flags |= XFS_XFLAG_APPEND; |
| 802 | if (di_flags & XFS_DIFLAG_SYNC) |
| 803 | flags |= XFS_XFLAG_SYNC; |
| 804 | if (di_flags & XFS_DIFLAG_NOATIME) |
| 805 | flags |= XFS_XFLAG_NOATIME; |
| 806 | if (di_flags & XFS_DIFLAG_NODUMP) |
| 807 | flags |= XFS_XFLAG_NODUMP; |
| 808 | if (di_flags & XFS_DIFLAG_RTINHERIT) |
| 809 | flags |= XFS_XFLAG_RTINHERIT; |
| 810 | if (di_flags & XFS_DIFLAG_PROJINHERIT) |
| 811 | flags |= XFS_XFLAG_PROJINHERIT; |
| 812 | if (di_flags & XFS_DIFLAG_NOSYMLINKS) |
| 813 | flags |= XFS_XFLAG_NOSYMLINKS; |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 814 | if (di_flags & XFS_DIFLAG_EXTSIZE) |
| 815 | flags |= XFS_XFLAG_EXTSIZE; |
| 816 | if (di_flags & XFS_DIFLAG_EXTSZINHERIT) |
| 817 | flags |= XFS_XFLAG_EXTSZINHERIT; |
Barry Naujok | d3446ea | 2006-06-09 14:54:19 +1000 | [diff] [blame] | 818 | if (di_flags & XFS_DIFLAG_NODEFRAG) |
| 819 | flags |= XFS_XFLAG_NODEFRAG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | } |
| 821 | |
| 822 | return flags; |
| 823 | } |
| 824 | |
| 825 | uint |
| 826 | xfs_ip2xflags( |
| 827 | xfs_inode_t *ip) |
| 828 | { |
| 829 | xfs_dinode_core_t *dic = &ip->i_d; |
| 830 | |
Nathan Scott | a916e2b | 2006-06-09 17:12:17 +1000 | [diff] [blame] | 831 | return _xfs_dic2xflags(dic->di_flags) | |
| 832 | (XFS_CFORK_Q(dic) ? XFS_XFLAG_HASATTR : 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | } |
| 834 | |
| 835 | uint |
| 836 | xfs_dic2xflags( |
| 837 | xfs_dinode_core_t *dic) |
| 838 | { |
Nathan Scott | a916e2b | 2006-06-09 17:12:17 +1000 | [diff] [blame] | 839 | return _xfs_dic2xflags(INT_GET(dic->di_flags, ARCH_CONVERT)) | |
| 840 | (XFS_CFORK_Q_DISK(dic) ? XFS_XFLAG_HASATTR : 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | } |
| 842 | |
| 843 | /* |
| 844 | * Given a mount structure and an inode number, return a pointer |
Nathan Scott | c41564b | 2006-03-29 08:55:14 +1000 | [diff] [blame] | 845 | * to a newly allocated in-core inode corresponding to the given |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | * inode number. |
| 847 | * |
| 848 | * Initialize the inode's attributes and extent pointers if it |
| 849 | * already has them (it will not if the inode has no links). |
| 850 | */ |
| 851 | int |
| 852 | xfs_iread( |
| 853 | xfs_mount_t *mp, |
| 854 | xfs_trans_t *tp, |
| 855 | xfs_ino_t ino, |
| 856 | xfs_inode_t **ipp, |
Nathan Scott | 745b1f47 | 2006-09-28 11:02:23 +1000 | [diff] [blame] | 857 | xfs_daddr_t bno, |
| 858 | uint imap_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | { |
| 860 | xfs_buf_t *bp; |
| 861 | xfs_dinode_t *dip; |
| 862 | xfs_inode_t *ip; |
| 863 | int error; |
| 864 | |
| 865 | ASSERT(xfs_inode_zone != NULL); |
| 866 | |
| 867 | ip = kmem_zone_zalloc(xfs_inode_zone, KM_SLEEP); |
| 868 | ip->i_ino = ino; |
| 869 | ip->i_mount = mp; |
David Chinner | f273ab8 | 2006-09-28 11:06:03 +1000 | [diff] [blame] | 870 | spin_lock_init(&ip->i_flags_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | |
| 872 | /* |
| 873 | * Get pointer's to the on-disk inode and the buffer containing it. |
| 874 | * If the inode number refers to a block outside the file system |
| 875 | * then xfs_itobp() will return NULL. In this case we should |
| 876 | * return NULL as well. Set i_blkno to 0 so that xfs_itobp() will |
| 877 | * know that this is a new incore inode. |
| 878 | */ |
Nathan Scott | 745b1f47 | 2006-09-28 11:02:23 +1000 | [diff] [blame] | 879 | error = xfs_itobp(mp, tp, ip, &dip, &bp, bno, imap_flags); |
Nathan Scott | b12dd34 | 2006-03-17 17:26:04 +1100 | [diff] [blame] | 880 | if (error) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | kmem_zone_free(xfs_inode_zone, ip); |
| 882 | return error; |
| 883 | } |
| 884 | |
| 885 | /* |
| 886 | * Initialize inode's trace buffers. |
| 887 | * Do this before xfs_iformat in case it adds entries. |
| 888 | */ |
| 889 | #ifdef XFS_BMAP_TRACE |
| 890 | ip->i_xtrace = ktrace_alloc(XFS_BMAP_KTRACE_SIZE, KM_SLEEP); |
| 891 | #endif |
| 892 | #ifdef XFS_BMBT_TRACE |
| 893 | ip->i_btrace = ktrace_alloc(XFS_BMBT_KTRACE_SIZE, KM_SLEEP); |
| 894 | #endif |
| 895 | #ifdef XFS_RW_TRACE |
| 896 | ip->i_rwtrace = ktrace_alloc(XFS_RW_KTRACE_SIZE, KM_SLEEP); |
| 897 | #endif |
| 898 | #ifdef XFS_ILOCK_TRACE |
| 899 | ip->i_lock_trace = ktrace_alloc(XFS_ILOCK_KTRACE_SIZE, KM_SLEEP); |
| 900 | #endif |
| 901 | #ifdef XFS_DIR2_TRACE |
| 902 | ip->i_dir_trace = ktrace_alloc(XFS_DIR2_KTRACE_SIZE, KM_SLEEP); |
| 903 | #endif |
| 904 | |
| 905 | /* |
| 906 | * If we got something that isn't an inode it means someone |
| 907 | * (nfs or dmi) has a stale handle. |
| 908 | */ |
| 909 | if (INT_GET(dip->di_core.di_magic, ARCH_CONVERT) != XFS_DINODE_MAGIC) { |
| 910 | kmem_zone_free(xfs_inode_zone, ip); |
| 911 | xfs_trans_brelse(tp, bp); |
| 912 | #ifdef DEBUG |
| 913 | xfs_fs_cmn_err(CE_ALERT, mp, "xfs_iread: " |
| 914 | "dip->di_core.di_magic (0x%x) != " |
| 915 | "XFS_DINODE_MAGIC (0x%x)", |
| 916 | INT_GET(dip->di_core.di_magic, ARCH_CONVERT), |
| 917 | XFS_DINODE_MAGIC); |
| 918 | #endif /* DEBUG */ |
| 919 | return XFS_ERROR(EINVAL); |
| 920 | } |
| 921 | |
| 922 | /* |
| 923 | * If the on-disk inode is already linked to a directory |
| 924 | * entry, copy all of the inode into the in-core inode. |
| 925 | * xfs_iformat() handles copying in the inode format |
| 926 | * specific information. |
| 927 | * Otherwise, just get the truly permanent information. |
| 928 | */ |
| 929 | if (dip->di_core.di_mode) { |
| 930 | xfs_xlate_dinode_core((xfs_caddr_t)&dip->di_core, |
| 931 | &(ip->i_d), 1); |
| 932 | error = xfs_iformat(ip, dip); |
| 933 | if (error) { |
| 934 | kmem_zone_free(xfs_inode_zone, ip); |
| 935 | xfs_trans_brelse(tp, bp); |
| 936 | #ifdef DEBUG |
| 937 | xfs_fs_cmn_err(CE_ALERT, mp, "xfs_iread: " |
| 938 | "xfs_iformat() returned error %d", |
| 939 | error); |
| 940 | #endif /* DEBUG */ |
| 941 | return error; |
| 942 | } |
| 943 | } else { |
| 944 | ip->i_d.di_magic = INT_GET(dip->di_core.di_magic, ARCH_CONVERT); |
| 945 | ip->i_d.di_version = INT_GET(dip->di_core.di_version, ARCH_CONVERT); |
| 946 | ip->i_d.di_gen = INT_GET(dip->di_core.di_gen, ARCH_CONVERT); |
| 947 | ip->i_d.di_flushiter = INT_GET(dip->di_core.di_flushiter, ARCH_CONVERT); |
| 948 | /* |
| 949 | * Make sure to pull in the mode here as well in |
| 950 | * case the inode is released without being used. |
| 951 | * This ensures that xfs_inactive() will see that |
| 952 | * the inode is already free and not try to mess |
| 953 | * with the uninitialized part of it. |
| 954 | */ |
| 955 | ip->i_d.di_mode = 0; |
| 956 | /* |
| 957 | * Initialize the per-fork minima and maxima for a new |
| 958 | * inode here. xfs_iformat will do it for old inodes. |
| 959 | */ |
| 960 | ip->i_df.if_ext_max = |
| 961 | XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t); |
| 962 | } |
| 963 | |
| 964 | INIT_LIST_HEAD(&ip->i_reclaim); |
| 965 | |
| 966 | /* |
| 967 | * The inode format changed when we moved the link count and |
| 968 | * made it 32 bits long. If this is an old format inode, |
| 969 | * convert it in memory to look like a new one. If it gets |
| 970 | * flushed to disk we will convert back before flushing or |
| 971 | * logging it. We zero out the new projid field and the old link |
| 972 | * count field. We'll handle clearing the pad field (the remains |
| 973 | * of the old uuid field) when we actually convert the inode to |
| 974 | * the new format. We don't change the version number so that we |
| 975 | * can distinguish this from a real new format inode. |
| 976 | */ |
| 977 | if (ip->i_d.di_version == XFS_DINODE_VERSION_1) { |
| 978 | ip->i_d.di_nlink = ip->i_d.di_onlink; |
| 979 | ip->i_d.di_onlink = 0; |
| 980 | ip->i_d.di_projid = 0; |
| 981 | } |
| 982 | |
| 983 | ip->i_delayed_blks = 0; |
| 984 | |
| 985 | /* |
| 986 | * Mark the buffer containing the inode as something to keep |
| 987 | * around for a while. This helps to keep recently accessed |
| 988 | * meta-data in-core longer. |
| 989 | */ |
| 990 | XFS_BUF_SET_REF(bp, XFS_INO_REF); |
| 991 | |
| 992 | /* |
| 993 | * Use xfs_trans_brelse() to release the buffer containing the |
| 994 | * on-disk inode, because it was acquired with xfs_trans_read_buf() |
| 995 | * in xfs_itobp() above. If tp is NULL, this is just a normal |
| 996 | * brelse(). If we're within a transaction, then xfs_trans_brelse() |
| 997 | * will only release the buffer if it is not dirty within the |
| 998 | * transaction. It will be OK to release the buffer in this case, |
| 999 | * because inodes on disk are never destroyed and we will be |
| 1000 | * locking the new in-core inode before putting it in the hash |
| 1001 | * table where other processes can find it. Thus we don't have |
| 1002 | * to worry about the inode being changed just because we released |
| 1003 | * the buffer. |
| 1004 | */ |
| 1005 | xfs_trans_brelse(tp, bp); |
| 1006 | *ipp = ip; |
| 1007 | return 0; |
| 1008 | } |
| 1009 | |
| 1010 | /* |
| 1011 | * Read in extents from a btree-format inode. |
| 1012 | * Allocate and fill in if_extents. Real work is done in xfs_bmap.c. |
| 1013 | */ |
| 1014 | int |
| 1015 | xfs_iread_extents( |
| 1016 | xfs_trans_t *tp, |
| 1017 | xfs_inode_t *ip, |
| 1018 | int whichfork) |
| 1019 | { |
| 1020 | int error; |
| 1021 | xfs_ifork_t *ifp; |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 1022 | xfs_extnum_t nextents; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | size_t size; |
| 1024 | |
| 1025 | if (unlikely(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) { |
| 1026 | XFS_ERROR_REPORT("xfs_iread_extents", XFS_ERRLEVEL_LOW, |
| 1027 | ip->i_mount); |
| 1028 | return XFS_ERROR(EFSCORRUPTED); |
| 1029 | } |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 1030 | nextents = XFS_IFORK_NEXTENTS(ip, whichfork); |
| 1031 | size = nextents * sizeof(xfs_bmbt_rec_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | ifp = XFS_IFORK_PTR(ip, whichfork); |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 1033 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | /* |
| 1035 | * We know that the size is valid (it's checked in iformat_btree) |
| 1036 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | ifp->if_lastex = NULLEXTNUM; |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 1038 | ifp->if_bytes = ifp->if_real_bytes = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | ifp->if_flags |= XFS_IFEXTENTS; |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 1040 | xfs_iext_add(ifp, 0, nextents); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | error = xfs_bmap_read_extents(tp, ip, whichfork); |
| 1042 | if (error) { |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 1043 | xfs_iext_destroy(ifp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | ifp->if_flags &= ~XFS_IFEXTENTS; |
| 1045 | return error; |
| 1046 | } |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 1047 | xfs_validate_extents(ifp, nextents, 0, XFS_EXTFMT_INODE(ip)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | return 0; |
| 1049 | } |
| 1050 | |
| 1051 | /* |
| 1052 | * Allocate an inode on disk and return a copy of its in-core version. |
| 1053 | * The in-core inode is locked exclusively. Set mode, nlink, and rdev |
| 1054 | * appropriately within the inode. The uid and gid for the inode are |
| 1055 | * set according to the contents of the given cred structure. |
| 1056 | * |
| 1057 | * Use xfs_dialloc() to allocate the on-disk inode. If xfs_dialloc() |
| 1058 | * has a free inode available, call xfs_iget() |
| 1059 | * to obtain the in-core version of the allocated inode. Finally, |
| 1060 | * fill in the inode and log its initial contents. In this case, |
| 1061 | * ialloc_context would be set to NULL and call_again set to false. |
| 1062 | * |
| 1063 | * If xfs_dialloc() does not have an available inode, |
| 1064 | * it will replenish its supply by doing an allocation. Since we can |
| 1065 | * only do one allocation within a transaction without deadlocks, we |
| 1066 | * must commit the current transaction before returning the inode itself. |
| 1067 | * In this case, therefore, we will set call_again to true and return. |
| 1068 | * The caller should then commit the current transaction, start a new |
| 1069 | * transaction, and call xfs_ialloc() again to actually get the inode. |
| 1070 | * |
| 1071 | * To ensure that some other process does not grab the inode that |
| 1072 | * was allocated during the first call to xfs_ialloc(), this routine |
| 1073 | * also returns the [locked] bp pointing to the head of the freelist |
| 1074 | * as ialloc_context. The caller should hold this buffer across |
| 1075 | * the commit and pass it back into this routine on the second call. |
| 1076 | */ |
| 1077 | int |
| 1078 | xfs_ialloc( |
| 1079 | xfs_trans_t *tp, |
| 1080 | xfs_inode_t *pip, |
| 1081 | mode_t mode, |
Nathan Scott | 31b084a | 2005-05-05 13:25:00 -0700 | [diff] [blame] | 1082 | xfs_nlink_t nlink, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | xfs_dev_t rdev, |
| 1084 | cred_t *cr, |
| 1085 | xfs_prid_t prid, |
| 1086 | int okalloc, |
| 1087 | xfs_buf_t **ialloc_context, |
| 1088 | boolean_t *call_again, |
| 1089 | xfs_inode_t **ipp) |
| 1090 | { |
| 1091 | xfs_ino_t ino; |
| 1092 | xfs_inode_t *ip; |
Nathan Scott | 67fcaa7 | 2006-06-09 17:00:52 +1000 | [diff] [blame] | 1093 | bhv_vnode_t *vp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | uint flags; |
| 1095 | int error; |
| 1096 | |
| 1097 | /* |
| 1098 | * Call the space management code to pick |
| 1099 | * the on-disk inode to be allocated. |
| 1100 | */ |
| 1101 | error = xfs_dialloc(tp, pip->i_ino, mode, okalloc, |
| 1102 | ialloc_context, call_again, &ino); |
| 1103 | if (error != 0) { |
| 1104 | return error; |
| 1105 | } |
| 1106 | if (*call_again || ino == NULLFSINO) { |
| 1107 | *ipp = NULL; |
| 1108 | return 0; |
| 1109 | } |
| 1110 | ASSERT(*ialloc_context == NULL); |
| 1111 | |
| 1112 | /* |
| 1113 | * Get the in-core inode with the lock held exclusively. |
| 1114 | * This is because we're setting fields here we need |
| 1115 | * to prevent others from looking at until we're done. |
| 1116 | */ |
| 1117 | error = xfs_trans_iget(tp->t_mountp, tp, ino, |
Nathan Scott | 745b1f47 | 2006-09-28 11:02:23 +1000 | [diff] [blame] | 1118 | XFS_IGET_CREATE, XFS_ILOCK_EXCL, &ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | if (error != 0) { |
| 1120 | return error; |
| 1121 | } |
| 1122 | ASSERT(ip != NULL); |
| 1123 | |
| 1124 | vp = XFS_ITOV(ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | ip->i_d.di_mode = (__uint16_t)mode; |
| 1126 | ip->i_d.di_onlink = 0; |
| 1127 | ip->i_d.di_nlink = nlink; |
| 1128 | ASSERT(ip->i_d.di_nlink == nlink); |
| 1129 | ip->i_d.di_uid = current_fsuid(cr); |
| 1130 | ip->i_d.di_gid = current_fsgid(cr); |
| 1131 | ip->i_d.di_projid = prid; |
| 1132 | memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad)); |
| 1133 | |
| 1134 | /* |
| 1135 | * If the superblock version is up to where we support new format |
| 1136 | * inodes and this is currently an old format inode, then change |
| 1137 | * the inode version number now. This way we only do the conversion |
| 1138 | * here rather than here and in the flush/logging code. |
| 1139 | */ |
| 1140 | if (XFS_SB_VERSION_HASNLINK(&tp->t_mountp->m_sb) && |
| 1141 | ip->i_d.di_version == XFS_DINODE_VERSION_1) { |
| 1142 | ip->i_d.di_version = XFS_DINODE_VERSION_2; |
| 1143 | /* |
| 1144 | * We've already zeroed the old link count, the projid field, |
| 1145 | * and the pad field. |
| 1146 | */ |
| 1147 | } |
| 1148 | |
| 1149 | /* |
| 1150 | * Project ids won't be stored on disk if we are using a version 1 inode. |
| 1151 | */ |
| 1152 | if ( (prid != 0) && (ip->i_d.di_version == XFS_DINODE_VERSION_1)) |
| 1153 | xfs_bump_ino_vers2(tp, ip); |
| 1154 | |
| 1155 | if (XFS_INHERIT_GID(pip, vp->v_vfsp)) { |
| 1156 | ip->i_d.di_gid = pip->i_d.di_gid; |
| 1157 | if ((pip->i_d.di_mode & S_ISGID) && (mode & S_IFMT) == S_IFDIR) { |
| 1158 | ip->i_d.di_mode |= S_ISGID; |
| 1159 | } |
| 1160 | } |
| 1161 | |
| 1162 | /* |
| 1163 | * If the group ID of the new file does not match the effective group |
| 1164 | * ID or one of the supplementary group IDs, the S_ISGID bit is cleared |
| 1165 | * (and only if the irix_sgid_inherit compatibility variable is set). |
| 1166 | */ |
| 1167 | if ((irix_sgid_inherit) && |
| 1168 | (ip->i_d.di_mode & S_ISGID) && |
| 1169 | (!in_group_p((gid_t)ip->i_d.di_gid))) { |
| 1170 | ip->i_d.di_mode &= ~S_ISGID; |
| 1171 | } |
| 1172 | |
| 1173 | ip->i_d.di_size = 0; |
| 1174 | ip->i_d.di_nextents = 0; |
| 1175 | ASSERT(ip->i_d.di_nblocks == 0); |
| 1176 | xfs_ichgtime(ip, XFS_ICHGTIME_CHG|XFS_ICHGTIME_ACC|XFS_ICHGTIME_MOD); |
| 1177 | /* |
| 1178 | * di_gen will have been taken care of in xfs_iread. |
| 1179 | */ |
| 1180 | ip->i_d.di_extsize = 0; |
| 1181 | ip->i_d.di_dmevmask = 0; |
| 1182 | ip->i_d.di_dmstate = 0; |
| 1183 | ip->i_d.di_flags = 0; |
| 1184 | flags = XFS_ILOG_CORE; |
| 1185 | switch (mode & S_IFMT) { |
| 1186 | case S_IFIFO: |
| 1187 | case S_IFCHR: |
| 1188 | case S_IFBLK: |
| 1189 | case S_IFSOCK: |
| 1190 | ip->i_d.di_format = XFS_DINODE_FMT_DEV; |
| 1191 | ip->i_df.if_u2.if_rdev = rdev; |
| 1192 | ip->i_df.if_flags = 0; |
| 1193 | flags |= XFS_ILOG_DEV; |
| 1194 | break; |
| 1195 | case S_IFREG: |
| 1196 | case S_IFDIR: |
| 1197 | if (unlikely(pip->i_d.di_flags & XFS_DIFLAG_ANY)) { |
Nathan Scott | 365ca83 | 2005-06-21 15:39:12 +1000 | [diff] [blame] | 1198 | uint di_flags = 0; |
| 1199 | |
| 1200 | if ((mode & S_IFMT) == S_IFDIR) { |
| 1201 | if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT) |
| 1202 | di_flags |= XFS_DIFLAG_RTINHERIT; |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 1203 | if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) { |
| 1204 | di_flags |= XFS_DIFLAG_EXTSZINHERIT; |
| 1205 | ip->i_d.di_extsize = pip->i_d.di_extsize; |
| 1206 | } |
| 1207 | } else if ((mode & S_IFMT) == S_IFREG) { |
Nathan Scott | 365ca83 | 2005-06-21 15:39:12 +1000 | [diff] [blame] | 1208 | if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT) { |
| 1209 | di_flags |= XFS_DIFLAG_REALTIME; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | ip->i_iocore.io_flags |= XFS_IOCORE_RT; |
| 1211 | } |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 1212 | if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) { |
| 1213 | di_flags |= XFS_DIFLAG_EXTSIZE; |
| 1214 | ip->i_d.di_extsize = pip->i_d.di_extsize; |
| 1215 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | } |
| 1217 | if ((pip->i_d.di_flags & XFS_DIFLAG_NOATIME) && |
| 1218 | xfs_inherit_noatime) |
Nathan Scott | 365ca83 | 2005-06-21 15:39:12 +1000 | [diff] [blame] | 1219 | di_flags |= XFS_DIFLAG_NOATIME; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | if ((pip->i_d.di_flags & XFS_DIFLAG_NODUMP) && |
| 1221 | xfs_inherit_nodump) |
Nathan Scott | 365ca83 | 2005-06-21 15:39:12 +1000 | [diff] [blame] | 1222 | di_flags |= XFS_DIFLAG_NODUMP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | if ((pip->i_d.di_flags & XFS_DIFLAG_SYNC) && |
| 1224 | xfs_inherit_sync) |
Nathan Scott | 365ca83 | 2005-06-21 15:39:12 +1000 | [diff] [blame] | 1225 | di_flags |= XFS_DIFLAG_SYNC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | if ((pip->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) && |
| 1227 | xfs_inherit_nosymlinks) |
Nathan Scott | 365ca83 | 2005-06-21 15:39:12 +1000 | [diff] [blame] | 1228 | di_flags |= XFS_DIFLAG_NOSYMLINKS; |
| 1229 | if (pip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) |
| 1230 | di_flags |= XFS_DIFLAG_PROJINHERIT; |
Barry Naujok | d3446ea | 2006-06-09 14:54:19 +1000 | [diff] [blame] | 1231 | if ((pip->i_d.di_flags & XFS_DIFLAG_NODEFRAG) && |
| 1232 | xfs_inherit_nodefrag) |
| 1233 | di_flags |= XFS_DIFLAG_NODEFRAG; |
Nathan Scott | 365ca83 | 2005-06-21 15:39:12 +1000 | [diff] [blame] | 1234 | ip->i_d.di_flags |= di_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | } |
| 1236 | /* FALLTHROUGH */ |
| 1237 | case S_IFLNK: |
| 1238 | ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS; |
| 1239 | ip->i_df.if_flags = XFS_IFEXTENTS; |
| 1240 | ip->i_df.if_bytes = ip->i_df.if_real_bytes = 0; |
| 1241 | ip->i_df.if_u1.if_extents = NULL; |
| 1242 | break; |
| 1243 | default: |
| 1244 | ASSERT(0); |
| 1245 | } |
| 1246 | /* |
| 1247 | * Attribute fork settings for new inode. |
| 1248 | */ |
| 1249 | ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS; |
| 1250 | ip->i_d.di_anextents = 0; |
| 1251 | |
| 1252 | /* |
| 1253 | * Log the new values stuffed into the inode. |
| 1254 | */ |
| 1255 | xfs_trans_log_inode(tp, ip, flags); |
| 1256 | |
Nathan Scott | b83bd13 | 2006-06-09 16:48:30 +1000 | [diff] [blame] | 1257 | /* now that we have an i_mode we can setup inode ops and unlock */ |
| 1258 | bhv_vfs_init_vnode(XFS_MTOVFS(tp->t_mountp), vp, XFS_ITOBHV(ip), 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | |
| 1260 | *ipp = ip; |
| 1261 | return 0; |
| 1262 | } |
| 1263 | |
| 1264 | /* |
| 1265 | * Check to make sure that there are no blocks allocated to the |
| 1266 | * file beyond the size of the file. We don't check this for |
| 1267 | * files with fixed size extents or real time extents, but we |
| 1268 | * at least do it for regular files. |
| 1269 | */ |
| 1270 | #ifdef DEBUG |
| 1271 | void |
| 1272 | xfs_isize_check( |
| 1273 | xfs_mount_t *mp, |
| 1274 | xfs_inode_t *ip, |
| 1275 | xfs_fsize_t isize) |
| 1276 | { |
| 1277 | xfs_fileoff_t map_first; |
| 1278 | int nimaps; |
| 1279 | xfs_bmbt_irec_t imaps[2]; |
| 1280 | |
| 1281 | if ((ip->i_d.di_mode & S_IFMT) != S_IFREG) |
| 1282 | return; |
| 1283 | |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 1284 | if (ip->i_d.di_flags & (XFS_DIFLAG_REALTIME | XFS_DIFLAG_EXTSIZE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | return; |
| 1286 | |
| 1287 | nimaps = 2; |
| 1288 | map_first = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize); |
| 1289 | /* |
| 1290 | * The filesystem could be shutting down, so bmapi may return |
| 1291 | * an error. |
| 1292 | */ |
| 1293 | if (xfs_bmapi(NULL, ip, map_first, |
| 1294 | (XFS_B_TO_FSB(mp, |
| 1295 | (xfs_ufsize_t)XFS_MAXIOFFSET(mp)) - |
| 1296 | map_first), |
| 1297 | XFS_BMAPI_ENTIRE, NULL, 0, imaps, &nimaps, |
Olaf Weber | 3e57ecf | 2006-06-09 14:48:12 +1000 | [diff] [blame] | 1298 | NULL, NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | return; |
| 1300 | ASSERT(nimaps == 1); |
| 1301 | ASSERT(imaps[0].br_startblock == HOLESTARTBLOCK); |
| 1302 | } |
| 1303 | #endif /* DEBUG */ |
| 1304 | |
| 1305 | /* |
| 1306 | * Calculate the last possible buffered byte in a file. This must |
| 1307 | * include data that was buffered beyond the EOF by the write code. |
| 1308 | * This also needs to deal with overflowing the xfs_fsize_t type |
| 1309 | * which can happen for sizes near the limit. |
| 1310 | * |
| 1311 | * We also need to take into account any blocks beyond the EOF. It |
| 1312 | * may be the case that they were buffered by a write which failed. |
| 1313 | * In that case the pages will still be in memory, but the inode size |
| 1314 | * will never have been updated. |
| 1315 | */ |
| 1316 | xfs_fsize_t |
| 1317 | xfs_file_last_byte( |
| 1318 | xfs_inode_t *ip) |
| 1319 | { |
| 1320 | xfs_mount_t *mp; |
| 1321 | xfs_fsize_t last_byte; |
| 1322 | xfs_fileoff_t last_block; |
| 1323 | xfs_fileoff_t size_last_block; |
| 1324 | int error; |
| 1325 | |
| 1326 | ASSERT(ismrlocked(&(ip->i_iolock), MR_UPDATE | MR_ACCESS)); |
| 1327 | |
| 1328 | mp = ip->i_mount; |
| 1329 | /* |
| 1330 | * Only check for blocks beyond the EOF if the extents have |
| 1331 | * been read in. This eliminates the need for the inode lock, |
| 1332 | * and it also saves us from looking when it really isn't |
| 1333 | * necessary. |
| 1334 | */ |
| 1335 | if (ip->i_df.if_flags & XFS_IFEXTENTS) { |
| 1336 | error = xfs_bmap_last_offset(NULL, ip, &last_block, |
| 1337 | XFS_DATA_FORK); |
| 1338 | if (error) { |
| 1339 | last_block = 0; |
| 1340 | } |
| 1341 | } else { |
| 1342 | last_block = 0; |
| 1343 | } |
| 1344 | size_last_block = XFS_B_TO_FSB(mp, (xfs_ufsize_t)ip->i_d.di_size); |
| 1345 | last_block = XFS_FILEOFF_MAX(last_block, size_last_block); |
| 1346 | |
| 1347 | last_byte = XFS_FSB_TO_B(mp, last_block); |
| 1348 | if (last_byte < 0) { |
| 1349 | return XFS_MAXIOFFSET(mp); |
| 1350 | } |
| 1351 | last_byte += (1 << mp->m_writeio_log); |
| 1352 | if (last_byte < 0) { |
| 1353 | return XFS_MAXIOFFSET(mp); |
| 1354 | } |
| 1355 | return last_byte; |
| 1356 | } |
| 1357 | |
| 1358 | #if defined(XFS_RW_TRACE) |
| 1359 | STATIC void |
| 1360 | xfs_itrunc_trace( |
| 1361 | int tag, |
| 1362 | xfs_inode_t *ip, |
| 1363 | int flag, |
| 1364 | xfs_fsize_t new_size, |
| 1365 | xfs_off_t toss_start, |
| 1366 | xfs_off_t toss_finish) |
| 1367 | { |
| 1368 | if (ip->i_rwtrace == NULL) { |
| 1369 | return; |
| 1370 | } |
| 1371 | |
| 1372 | ktrace_enter(ip->i_rwtrace, |
| 1373 | (void*)((long)tag), |
| 1374 | (void*)ip, |
| 1375 | (void*)(unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff), |
| 1376 | (void*)(unsigned long)(ip->i_d.di_size & 0xffffffff), |
| 1377 | (void*)((long)flag), |
| 1378 | (void*)(unsigned long)((new_size >> 32) & 0xffffffff), |
| 1379 | (void*)(unsigned long)(new_size & 0xffffffff), |
| 1380 | (void*)(unsigned long)((toss_start >> 32) & 0xffffffff), |
| 1381 | (void*)(unsigned long)(toss_start & 0xffffffff), |
| 1382 | (void*)(unsigned long)((toss_finish >> 32) & 0xffffffff), |
| 1383 | (void*)(unsigned long)(toss_finish & 0xffffffff), |
| 1384 | (void*)(unsigned long)current_cpu(), |
Yingping Lu | f1fdc84 | 2006-03-22 12:44:15 +1100 | [diff] [blame] | 1385 | (void*)(unsigned long)current_pid(), |
| 1386 | (void*)NULL, |
| 1387 | (void*)NULL, |
| 1388 | (void*)NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | } |
| 1390 | #else |
| 1391 | #define xfs_itrunc_trace(tag, ip, flag, new_size, toss_start, toss_finish) |
| 1392 | #endif |
| 1393 | |
| 1394 | /* |
| 1395 | * Start the truncation of the file to new_size. The new size |
| 1396 | * must be smaller than the current size. This routine will |
| 1397 | * clear the buffer and page caches of file data in the removed |
| 1398 | * range, and xfs_itruncate_finish() will remove the underlying |
| 1399 | * disk blocks. |
| 1400 | * |
| 1401 | * The inode must have its I/O lock locked EXCLUSIVELY, and it |
| 1402 | * must NOT have the inode lock held at all. This is because we're |
| 1403 | * calling into the buffer/page cache code and we can't hold the |
| 1404 | * inode lock when we do so. |
| 1405 | * |
David Chinner | 38e2299 | 2006-03-22 12:47:15 +1100 | [diff] [blame] | 1406 | * We need to wait for any direct I/Os in flight to complete before we |
| 1407 | * proceed with the truncate. This is needed to prevent the extents |
| 1408 | * being read or written by the direct I/Os from being removed while the |
| 1409 | * I/O is in flight as there is no other method of synchronising |
| 1410 | * direct I/O with the truncate operation. Also, because we hold |
| 1411 | * the IOLOCK in exclusive mode, we prevent new direct I/Os from being |
| 1412 | * started until the truncate completes and drops the lock. Essentially, |
| 1413 | * the vn_iowait() call forms an I/O barrier that provides strict ordering |
| 1414 | * between direct I/Os and the truncate operation. |
| 1415 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | * The flags parameter can have either the value XFS_ITRUNC_DEFINITE |
| 1417 | * or XFS_ITRUNC_MAYBE. The XFS_ITRUNC_MAYBE value should be used |
| 1418 | * in the case that the caller is locking things out of order and |
| 1419 | * may not be able to call xfs_itruncate_finish() with the inode lock |
| 1420 | * held without dropping the I/O lock. If the caller must drop the |
| 1421 | * I/O lock before calling xfs_itruncate_finish(), then xfs_itruncate_start() |
| 1422 | * must be called again with all the same restrictions as the initial |
| 1423 | * call. |
| 1424 | */ |
| 1425 | void |
| 1426 | xfs_itruncate_start( |
| 1427 | xfs_inode_t *ip, |
| 1428 | uint flags, |
| 1429 | xfs_fsize_t new_size) |
| 1430 | { |
| 1431 | xfs_fsize_t last_byte; |
| 1432 | xfs_off_t toss_start; |
| 1433 | xfs_mount_t *mp; |
Nathan Scott | 67fcaa7 | 2006-06-09 17:00:52 +1000 | [diff] [blame] | 1434 | bhv_vnode_t *vp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | |
| 1436 | ASSERT(ismrlocked(&ip->i_iolock, MR_UPDATE) != 0); |
| 1437 | ASSERT((new_size == 0) || (new_size <= ip->i_d.di_size)); |
| 1438 | ASSERT((flags == XFS_ITRUNC_DEFINITE) || |
| 1439 | (flags == XFS_ITRUNC_MAYBE)); |
| 1440 | |
| 1441 | mp = ip->i_mount; |
| 1442 | vp = XFS_ITOV(ip); |
Yingping Lu | 9fa8046 | 2006-03-22 12:44:35 +1100 | [diff] [blame] | 1443 | |
| 1444 | vn_iowait(vp); /* wait for the completion of any pending DIOs */ |
| 1445 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | /* |
Nathan Scott | 67fcaa7 | 2006-06-09 17:00:52 +1000 | [diff] [blame] | 1447 | * Call toss_pages or flushinval_pages to get rid of pages |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1448 | * overlapping the region being removed. We have to use |
Nathan Scott | 67fcaa7 | 2006-06-09 17:00:52 +1000 | [diff] [blame] | 1449 | * the less efficient flushinval_pages in the case that the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1450 | * caller may not be able to finish the truncate without |
| 1451 | * dropping the inode's I/O lock. Make sure |
| 1452 | * to catch any pages brought in by buffers overlapping |
| 1453 | * the EOF by searching out beyond the isize by our |
| 1454 | * block size. We round new_size up to a block boundary |
| 1455 | * so that we don't toss things on the same block as |
| 1456 | * new_size but before it. |
| 1457 | * |
Nathan Scott | 67fcaa7 | 2006-06-09 17:00:52 +1000 | [diff] [blame] | 1458 | * Before calling toss_page or flushinval_pages, make sure to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | * call remapf() over the same region if the file is mapped. |
| 1460 | * This frees up mapped file references to the pages in the |
Nathan Scott | 67fcaa7 | 2006-06-09 17:00:52 +1000 | [diff] [blame] | 1461 | * given range and for the flushinval_pages case it ensures |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | * that we get the latest mapped changes flushed out. |
| 1463 | */ |
| 1464 | toss_start = XFS_B_TO_FSB(mp, (xfs_ufsize_t)new_size); |
| 1465 | toss_start = XFS_FSB_TO_B(mp, toss_start); |
| 1466 | if (toss_start < 0) { |
| 1467 | /* |
| 1468 | * The place to start tossing is beyond our maximum |
| 1469 | * file size, so there is no way that the data extended |
| 1470 | * out there. |
| 1471 | */ |
| 1472 | return; |
| 1473 | } |
| 1474 | last_byte = xfs_file_last_byte(ip); |
| 1475 | xfs_itrunc_trace(XFS_ITRUNC_START, ip, flags, new_size, toss_start, |
| 1476 | last_byte); |
| 1477 | if (last_byte > toss_start) { |
| 1478 | if (flags & XFS_ITRUNC_DEFINITE) { |
Nathan Scott | 67fcaa7 | 2006-06-09 17:00:52 +1000 | [diff] [blame] | 1479 | bhv_vop_toss_pages(vp, toss_start, -1, FI_REMAPF_LOCKED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1480 | } else { |
Nathan Scott | 67fcaa7 | 2006-06-09 17:00:52 +1000 | [diff] [blame] | 1481 | bhv_vop_flushinval_pages(vp, toss_start, -1, FI_REMAPF_LOCKED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | } |
| 1483 | } |
| 1484 | |
| 1485 | #ifdef DEBUG |
| 1486 | if (new_size == 0) { |
| 1487 | ASSERT(VN_CACHED(vp) == 0); |
| 1488 | } |
| 1489 | #endif |
| 1490 | } |
| 1491 | |
| 1492 | /* |
| 1493 | * Shrink the file to the given new_size. The new |
| 1494 | * size must be smaller than the current size. |
| 1495 | * This will free up the underlying blocks |
| 1496 | * in the removed range after a call to xfs_itruncate_start() |
| 1497 | * or xfs_atruncate_start(). |
| 1498 | * |
| 1499 | * The transaction passed to this routine must have made |
| 1500 | * a permanent log reservation of at least XFS_ITRUNCATE_LOG_RES. |
| 1501 | * This routine may commit the given transaction and |
| 1502 | * start new ones, so make sure everything involved in |
| 1503 | * the transaction is tidy before calling here. |
| 1504 | * Some transaction will be returned to the caller to be |
| 1505 | * committed. The incoming transaction must already include |
| 1506 | * the inode, and both inode locks must be held exclusively. |
| 1507 | * The inode must also be "held" within the transaction. On |
| 1508 | * return the inode will be "held" within the returned transaction. |
| 1509 | * This routine does NOT require any disk space to be reserved |
| 1510 | * for it within the transaction. |
| 1511 | * |
| 1512 | * The fork parameter must be either xfs_attr_fork or xfs_data_fork, |
| 1513 | * and it indicates the fork which is to be truncated. For the |
| 1514 | * attribute fork we only support truncation to size 0. |
| 1515 | * |
| 1516 | * We use the sync parameter to indicate whether or not the first |
| 1517 | * transaction we perform might have to be synchronous. For the attr fork, |
| 1518 | * it needs to be so if the unlink of the inode is not yet known to be |
| 1519 | * permanent in the log. This keeps us from freeing and reusing the |
| 1520 | * blocks of the attribute fork before the unlink of the inode becomes |
| 1521 | * permanent. |
| 1522 | * |
| 1523 | * For the data fork, we normally have to run synchronously if we're |
| 1524 | * being called out of the inactive path or we're being called |
| 1525 | * out of the create path where we're truncating an existing file. |
| 1526 | * Either way, the truncate needs to be sync so blocks don't reappear |
| 1527 | * in the file with altered data in case of a crash. wsync filesystems |
| 1528 | * can run the first case async because anything that shrinks the inode |
| 1529 | * has to run sync so by the time we're called here from inactive, the |
| 1530 | * inode size is permanently set to 0. |
| 1531 | * |
| 1532 | * Calls from the truncate path always need to be sync unless we're |
| 1533 | * in a wsync filesystem and the file has already been unlinked. |
| 1534 | * |
| 1535 | * The caller is responsible for correctly setting the sync parameter. |
| 1536 | * It gets too hard for us to guess here which path we're being called |
| 1537 | * out of just based on inode state. |
| 1538 | */ |
| 1539 | int |
| 1540 | xfs_itruncate_finish( |
| 1541 | xfs_trans_t **tp, |
| 1542 | xfs_inode_t *ip, |
| 1543 | xfs_fsize_t new_size, |
| 1544 | int fork, |
| 1545 | int sync) |
| 1546 | { |
| 1547 | xfs_fsblock_t first_block; |
| 1548 | xfs_fileoff_t first_unmap_block; |
| 1549 | xfs_fileoff_t last_block; |
| 1550 | xfs_filblks_t unmap_len=0; |
| 1551 | xfs_mount_t *mp; |
| 1552 | xfs_trans_t *ntp; |
| 1553 | int done; |
| 1554 | int committed; |
| 1555 | xfs_bmap_free_t free_list; |
| 1556 | int error; |
| 1557 | |
| 1558 | ASSERT(ismrlocked(&ip->i_iolock, MR_UPDATE) != 0); |
| 1559 | ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0); |
| 1560 | ASSERT((new_size == 0) || (new_size <= ip->i_d.di_size)); |
| 1561 | ASSERT(*tp != NULL); |
| 1562 | ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES); |
| 1563 | ASSERT(ip->i_transp == *tp); |
| 1564 | ASSERT(ip->i_itemp != NULL); |
| 1565 | ASSERT(ip->i_itemp->ili_flags & XFS_ILI_HOLD); |
| 1566 | |
| 1567 | |
| 1568 | ntp = *tp; |
| 1569 | mp = (ntp)->t_mountp; |
| 1570 | ASSERT(! XFS_NOT_DQATTACHED(mp, ip)); |
| 1571 | |
| 1572 | /* |
| 1573 | * We only support truncating the entire attribute fork. |
| 1574 | */ |
| 1575 | if (fork == XFS_ATTR_FORK) { |
| 1576 | new_size = 0LL; |
| 1577 | } |
| 1578 | first_unmap_block = XFS_B_TO_FSB(mp, (xfs_ufsize_t)new_size); |
| 1579 | xfs_itrunc_trace(XFS_ITRUNC_FINISH1, ip, 0, new_size, 0, 0); |
| 1580 | /* |
| 1581 | * The first thing we do is set the size to new_size permanently |
| 1582 | * on disk. This way we don't have to worry about anyone ever |
| 1583 | * being able to look at the data being freed even in the face |
| 1584 | * of a crash. What we're getting around here is the case where |
| 1585 | * we free a block, it is allocated to another file, it is written |
| 1586 | * to, and then we crash. If the new data gets written to the |
| 1587 | * file but the log buffers containing the free and reallocation |
| 1588 | * don't, then we'd end up with garbage in the blocks being freed. |
| 1589 | * As long as we make the new_size permanent before actually |
| 1590 | * freeing any blocks it doesn't matter if they get writtten to. |
| 1591 | * |
| 1592 | * The callers must signal into us whether or not the size |
| 1593 | * setting here must be synchronous. There are a few cases |
| 1594 | * where it doesn't have to be synchronous. Those cases |
| 1595 | * occur if the file is unlinked and we know the unlink is |
| 1596 | * permanent or if the blocks being truncated are guaranteed |
| 1597 | * to be beyond the inode eof (regardless of the link count) |
| 1598 | * and the eof value is permanent. Both of these cases occur |
| 1599 | * only on wsync-mounted filesystems. In those cases, we're |
| 1600 | * guaranteed that no user will ever see the data in the blocks |
| 1601 | * that are being truncated so the truncate can run async. |
| 1602 | * In the free beyond eof case, the file may wind up with |
| 1603 | * more blocks allocated to it than it needs if we crash |
| 1604 | * and that won't get fixed until the next time the file |
| 1605 | * is re-opened and closed but that's ok as that shouldn't |
| 1606 | * be too many blocks. |
| 1607 | * |
| 1608 | * However, we can't just make all wsync xactions run async |
| 1609 | * because there's one call out of the create path that needs |
| 1610 | * to run sync where it's truncating an existing file to size |
| 1611 | * 0 whose size is > 0. |
| 1612 | * |
| 1613 | * It's probably possible to come up with a test in this |
| 1614 | * routine that would correctly distinguish all the above |
| 1615 | * cases from the values of the function parameters and the |
| 1616 | * inode state but for sanity's sake, I've decided to let the |
| 1617 | * layers above just tell us. It's simpler to correctly figure |
| 1618 | * out in the layer above exactly under what conditions we |
| 1619 | * can run async and I think it's easier for others read and |
| 1620 | * follow the logic in case something has to be changed. |
| 1621 | * cscope is your friend -- rcc. |
| 1622 | * |
| 1623 | * The attribute fork is much simpler. |
| 1624 | * |
| 1625 | * For the attribute fork we allow the caller to tell us whether |
| 1626 | * the unlink of the inode that led to this call is yet permanent |
| 1627 | * in the on disk log. If it is not and we will be freeing extents |
| 1628 | * in this inode then we make the first transaction synchronous |
| 1629 | * to make sure that the unlink is permanent by the time we free |
| 1630 | * the blocks. |
| 1631 | */ |
| 1632 | if (fork == XFS_DATA_FORK) { |
| 1633 | if (ip->i_d.di_nextents > 0) { |
| 1634 | ip->i_d.di_size = new_size; |
| 1635 | xfs_trans_log_inode(ntp, ip, XFS_ILOG_CORE); |
| 1636 | } |
| 1637 | } else if (sync) { |
| 1638 | ASSERT(!(mp->m_flags & XFS_MOUNT_WSYNC)); |
| 1639 | if (ip->i_d.di_anextents > 0) |
| 1640 | xfs_trans_set_sync(ntp); |
| 1641 | } |
| 1642 | ASSERT(fork == XFS_DATA_FORK || |
| 1643 | (fork == XFS_ATTR_FORK && |
| 1644 | ((sync && !(mp->m_flags & XFS_MOUNT_WSYNC)) || |
| 1645 | (sync == 0 && (mp->m_flags & XFS_MOUNT_WSYNC))))); |
| 1646 | |
| 1647 | /* |
| 1648 | * Since it is possible for space to become allocated beyond |
| 1649 | * the end of the file (in a crash where the space is allocated |
| 1650 | * but the inode size is not yet updated), simply remove any |
| 1651 | * blocks which show up between the new EOF and the maximum |
| 1652 | * possible file size. If the first block to be removed is |
| 1653 | * beyond the maximum file size (ie it is the same as last_block), |
| 1654 | * then there is nothing to do. |
| 1655 | */ |
| 1656 | last_block = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp)); |
| 1657 | ASSERT(first_unmap_block <= last_block); |
| 1658 | done = 0; |
| 1659 | if (last_block == first_unmap_block) { |
| 1660 | done = 1; |
| 1661 | } else { |
| 1662 | unmap_len = last_block - first_unmap_block + 1; |
| 1663 | } |
| 1664 | while (!done) { |
| 1665 | /* |
| 1666 | * Free up up to XFS_ITRUNC_MAX_EXTENTS. xfs_bunmapi() |
| 1667 | * will tell us whether it freed the entire range or |
| 1668 | * not. If this is a synchronous mount (wsync), |
| 1669 | * then we can tell bunmapi to keep all the |
| 1670 | * transactions asynchronous since the unlink |
| 1671 | * transaction that made this inode inactive has |
| 1672 | * already hit the disk. There's no danger of |
| 1673 | * the freed blocks being reused, there being a |
| 1674 | * crash, and the reused blocks suddenly reappearing |
| 1675 | * in this file with garbage in them once recovery |
| 1676 | * runs. |
| 1677 | */ |
| 1678 | XFS_BMAP_INIT(&free_list, &first_block); |
Olaf Weber | 3e57ecf | 2006-06-09 14:48:12 +1000 | [diff] [blame] | 1679 | error = XFS_BUNMAPI(mp, ntp, &ip->i_iocore, |
| 1680 | first_unmap_block, unmap_len, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | XFS_BMAPI_AFLAG(fork) | |
| 1682 | (sync ? 0 : XFS_BMAPI_ASYNC), |
| 1683 | XFS_ITRUNC_MAX_EXTENTS, |
Olaf Weber | 3e57ecf | 2006-06-09 14:48:12 +1000 | [diff] [blame] | 1684 | &first_block, &free_list, |
| 1685 | NULL, &done); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1686 | if (error) { |
| 1687 | /* |
| 1688 | * If the bunmapi call encounters an error, |
| 1689 | * return to the caller where the transaction |
| 1690 | * can be properly aborted. We just need to |
| 1691 | * make sure we're not holding any resources |
| 1692 | * that we were not when we came in. |
| 1693 | */ |
| 1694 | xfs_bmap_cancel(&free_list); |
| 1695 | return error; |
| 1696 | } |
| 1697 | |
| 1698 | /* |
| 1699 | * Duplicate the transaction that has the permanent |
| 1700 | * reservation and commit the old transaction. |
| 1701 | */ |
| 1702 | error = xfs_bmap_finish(tp, &free_list, first_block, |
| 1703 | &committed); |
| 1704 | ntp = *tp; |
| 1705 | if (error) { |
| 1706 | /* |
| 1707 | * If the bmap finish call encounters an error, |
| 1708 | * return to the caller where the transaction |
| 1709 | * can be properly aborted. We just need to |
| 1710 | * make sure we're not holding any resources |
| 1711 | * that we were not when we came in. |
| 1712 | * |
| 1713 | * Aborting from this point might lose some |
| 1714 | * blocks in the file system, but oh well. |
| 1715 | */ |
| 1716 | xfs_bmap_cancel(&free_list); |
| 1717 | if (committed) { |
| 1718 | /* |
| 1719 | * If the passed in transaction committed |
| 1720 | * in xfs_bmap_finish(), then we want to |
| 1721 | * add the inode to this one before returning. |
| 1722 | * This keeps things simple for the higher |
| 1723 | * level code, because it always knows that |
| 1724 | * the inode is locked and held in the |
| 1725 | * transaction that returns to it whether |
| 1726 | * errors occur or not. We don't mark the |
| 1727 | * inode dirty so that this transaction can |
| 1728 | * be easily aborted if possible. |
| 1729 | */ |
| 1730 | xfs_trans_ijoin(ntp, ip, |
| 1731 | XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); |
| 1732 | xfs_trans_ihold(ntp, ip); |
| 1733 | } |
| 1734 | return error; |
| 1735 | } |
| 1736 | |
| 1737 | if (committed) { |
| 1738 | /* |
| 1739 | * The first xact was committed, |
| 1740 | * so add the inode to the new one. |
| 1741 | * Mark it dirty so it will be logged |
| 1742 | * and moved forward in the log as |
| 1743 | * part of every commit. |
| 1744 | */ |
| 1745 | xfs_trans_ijoin(ntp, ip, |
| 1746 | XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); |
| 1747 | xfs_trans_ihold(ntp, ip); |
| 1748 | xfs_trans_log_inode(ntp, ip, XFS_ILOG_CORE); |
| 1749 | } |
| 1750 | ntp = xfs_trans_dup(ntp); |
| 1751 | (void) xfs_trans_commit(*tp, 0, NULL); |
| 1752 | *tp = ntp; |
| 1753 | error = xfs_trans_reserve(ntp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, |
| 1754 | XFS_TRANS_PERM_LOG_RES, |
| 1755 | XFS_ITRUNCATE_LOG_COUNT); |
| 1756 | /* |
| 1757 | * Add the inode being truncated to the next chained |
| 1758 | * transaction. |
| 1759 | */ |
| 1760 | xfs_trans_ijoin(ntp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); |
| 1761 | xfs_trans_ihold(ntp, ip); |
| 1762 | if (error) |
| 1763 | return (error); |
| 1764 | } |
| 1765 | /* |
| 1766 | * Only update the size in the case of the data fork, but |
| 1767 | * always re-log the inode so that our permanent transaction |
| 1768 | * can keep on rolling it forward in the log. |
| 1769 | */ |
| 1770 | if (fork == XFS_DATA_FORK) { |
| 1771 | xfs_isize_check(mp, ip, new_size); |
| 1772 | ip->i_d.di_size = new_size; |
| 1773 | } |
| 1774 | xfs_trans_log_inode(ntp, ip, XFS_ILOG_CORE); |
| 1775 | ASSERT((new_size != 0) || |
| 1776 | (fork == XFS_ATTR_FORK) || |
| 1777 | (ip->i_delayed_blks == 0)); |
| 1778 | ASSERT((new_size != 0) || |
| 1779 | (fork == XFS_ATTR_FORK) || |
| 1780 | (ip->i_d.di_nextents == 0)); |
| 1781 | xfs_itrunc_trace(XFS_ITRUNC_FINISH2, ip, 0, new_size, 0, 0); |
| 1782 | return 0; |
| 1783 | } |
| 1784 | |
| 1785 | |
| 1786 | /* |
| 1787 | * xfs_igrow_start |
| 1788 | * |
| 1789 | * Do the first part of growing a file: zero any data in the last |
| 1790 | * block that is beyond the old EOF. We need to do this before |
| 1791 | * the inode is joined to the transaction to modify the i_size. |
| 1792 | * That way we can drop the inode lock and call into the buffer |
| 1793 | * cache to get the buffer mapping the EOF. |
| 1794 | */ |
| 1795 | int |
| 1796 | xfs_igrow_start( |
| 1797 | xfs_inode_t *ip, |
| 1798 | xfs_fsize_t new_size, |
| 1799 | cred_t *credp) |
| 1800 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1801 | int error; |
| 1802 | |
| 1803 | ASSERT(ismrlocked(&(ip->i_lock), MR_UPDATE) != 0); |
| 1804 | ASSERT(ismrlocked(&(ip->i_iolock), MR_UPDATE) != 0); |
| 1805 | ASSERT(new_size > ip->i_d.di_size); |
| 1806 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1807 | /* |
| 1808 | * Zero any pages that may have been created by |
| 1809 | * xfs_write_file() beyond the end of the file |
| 1810 | * and any blocks between the old and new file sizes. |
| 1811 | */ |
Eric Sandeen | 24ee808 | 2006-01-11 15:34:32 +1100 | [diff] [blame] | 1812 | error = xfs_zero_eof(XFS_ITOV(ip), &ip->i_iocore, new_size, |
| 1813 | ip->i_d.di_size, new_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | return error; |
| 1815 | } |
| 1816 | |
| 1817 | /* |
| 1818 | * xfs_igrow_finish |
| 1819 | * |
| 1820 | * This routine is called to extend the size of a file. |
| 1821 | * The inode must have both the iolock and the ilock locked |
| 1822 | * for update and it must be a part of the current transaction. |
| 1823 | * The xfs_igrow_start() function must have been called previously. |
| 1824 | * If the change_flag is not zero, the inode change timestamp will |
| 1825 | * be updated. |
| 1826 | */ |
| 1827 | void |
| 1828 | xfs_igrow_finish( |
| 1829 | xfs_trans_t *tp, |
| 1830 | xfs_inode_t *ip, |
| 1831 | xfs_fsize_t new_size, |
| 1832 | int change_flag) |
| 1833 | { |
| 1834 | ASSERT(ismrlocked(&(ip->i_lock), MR_UPDATE) != 0); |
| 1835 | ASSERT(ismrlocked(&(ip->i_iolock), MR_UPDATE) != 0); |
| 1836 | ASSERT(ip->i_transp == tp); |
| 1837 | ASSERT(new_size > ip->i_d.di_size); |
| 1838 | |
| 1839 | /* |
| 1840 | * Update the file size. Update the inode change timestamp |
| 1841 | * if change_flag set. |
| 1842 | */ |
| 1843 | ip->i_d.di_size = new_size; |
| 1844 | if (change_flag) |
| 1845 | xfs_ichgtime(ip, XFS_ICHGTIME_CHG); |
| 1846 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
| 1847 | |
| 1848 | } |
| 1849 | |
| 1850 | |
| 1851 | /* |
| 1852 | * This is called when the inode's link count goes to 0. |
| 1853 | * We place the on-disk inode on a list in the AGI. It |
| 1854 | * will be pulled from this list when the inode is freed. |
| 1855 | */ |
| 1856 | int |
| 1857 | xfs_iunlink( |
| 1858 | xfs_trans_t *tp, |
| 1859 | xfs_inode_t *ip) |
| 1860 | { |
| 1861 | xfs_mount_t *mp; |
| 1862 | xfs_agi_t *agi; |
| 1863 | xfs_dinode_t *dip; |
| 1864 | xfs_buf_t *agibp; |
| 1865 | xfs_buf_t *ibp; |
| 1866 | xfs_agnumber_t agno; |
| 1867 | xfs_daddr_t agdaddr; |
| 1868 | xfs_agino_t agino; |
| 1869 | short bucket_index; |
| 1870 | int offset; |
| 1871 | int error; |
| 1872 | int agi_ok; |
| 1873 | |
| 1874 | ASSERT(ip->i_d.di_nlink == 0); |
| 1875 | ASSERT(ip->i_d.di_mode != 0); |
| 1876 | ASSERT(ip->i_transp == tp); |
| 1877 | |
| 1878 | mp = tp->t_mountp; |
| 1879 | |
| 1880 | agno = XFS_INO_TO_AGNO(mp, ip->i_ino); |
| 1881 | agdaddr = XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)); |
| 1882 | |
| 1883 | /* |
| 1884 | * Get the agi buffer first. It ensures lock ordering |
| 1885 | * on the list. |
| 1886 | */ |
| 1887 | error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, agdaddr, |
| 1888 | XFS_FSS_TO_BB(mp, 1), 0, &agibp); |
| 1889 | if (error) { |
| 1890 | return error; |
| 1891 | } |
| 1892 | /* |
| 1893 | * Validate the magic number of the agi block. |
| 1894 | */ |
| 1895 | agi = XFS_BUF_TO_AGI(agibp); |
| 1896 | agi_ok = |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 1897 | be32_to_cpu(agi->agi_magicnum) == XFS_AGI_MAGIC && |
| 1898 | XFS_AGI_GOOD_VERSION(be32_to_cpu(agi->agi_versionnum)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1899 | if (unlikely(XFS_TEST_ERROR(!agi_ok, mp, XFS_ERRTAG_IUNLINK, |
| 1900 | XFS_RANDOM_IUNLINK))) { |
| 1901 | XFS_CORRUPTION_ERROR("xfs_iunlink", XFS_ERRLEVEL_LOW, mp, agi); |
| 1902 | xfs_trans_brelse(tp, agibp); |
| 1903 | return XFS_ERROR(EFSCORRUPTED); |
| 1904 | } |
| 1905 | /* |
| 1906 | * Get the index into the agi hash table for the |
| 1907 | * list this inode will go on. |
| 1908 | */ |
| 1909 | agino = XFS_INO_TO_AGINO(mp, ip->i_ino); |
| 1910 | ASSERT(agino != 0); |
| 1911 | bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS; |
| 1912 | ASSERT(agi->agi_unlinked[bucket_index]); |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 1913 | ASSERT(be32_to_cpu(agi->agi_unlinked[bucket_index]) != agino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1914 | |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 1915 | if (be32_to_cpu(agi->agi_unlinked[bucket_index]) != NULLAGINO) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1916 | /* |
| 1917 | * There is already another inode in the bucket we need |
| 1918 | * to add ourselves to. Add us at the front of the list. |
| 1919 | * Here we put the head pointer into our next pointer, |
| 1920 | * and then we fall through to point the head at us. |
| 1921 | */ |
Nathan Scott | b12dd34 | 2006-03-17 17:26:04 +1100 | [diff] [blame] | 1922 | error = xfs_itobp(mp, tp, ip, &dip, &ibp, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1923 | if (error) { |
| 1924 | return error; |
| 1925 | } |
| 1926 | ASSERT(INT_GET(dip->di_next_unlinked, ARCH_CONVERT) == NULLAGINO); |
| 1927 | ASSERT(dip->di_next_unlinked); |
| 1928 | /* both on-disk, don't endian flip twice */ |
| 1929 | dip->di_next_unlinked = agi->agi_unlinked[bucket_index]; |
| 1930 | offset = ip->i_boffset + |
| 1931 | offsetof(xfs_dinode_t, di_next_unlinked); |
| 1932 | xfs_trans_inode_buf(tp, ibp); |
| 1933 | xfs_trans_log_buf(tp, ibp, offset, |
| 1934 | (offset + sizeof(xfs_agino_t) - 1)); |
| 1935 | xfs_inobp_check(mp, ibp); |
| 1936 | } |
| 1937 | |
| 1938 | /* |
| 1939 | * Point the bucket head pointer at the inode being inserted. |
| 1940 | */ |
| 1941 | ASSERT(agino != 0); |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 1942 | agi->agi_unlinked[bucket_index] = cpu_to_be32(agino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1943 | offset = offsetof(xfs_agi_t, agi_unlinked) + |
| 1944 | (sizeof(xfs_agino_t) * bucket_index); |
| 1945 | xfs_trans_log_buf(tp, agibp, offset, |
| 1946 | (offset + sizeof(xfs_agino_t) - 1)); |
| 1947 | return 0; |
| 1948 | } |
| 1949 | |
| 1950 | /* |
| 1951 | * Pull the on-disk inode from the AGI unlinked list. |
| 1952 | */ |
| 1953 | STATIC int |
| 1954 | xfs_iunlink_remove( |
| 1955 | xfs_trans_t *tp, |
| 1956 | xfs_inode_t *ip) |
| 1957 | { |
| 1958 | xfs_ino_t next_ino; |
| 1959 | xfs_mount_t *mp; |
| 1960 | xfs_agi_t *agi; |
| 1961 | xfs_dinode_t *dip; |
| 1962 | xfs_buf_t *agibp; |
| 1963 | xfs_buf_t *ibp; |
| 1964 | xfs_agnumber_t agno; |
| 1965 | xfs_daddr_t agdaddr; |
| 1966 | xfs_agino_t agino; |
| 1967 | xfs_agino_t next_agino; |
| 1968 | xfs_buf_t *last_ibp; |
Nathan Scott | 6fdf8cc | 2006-06-28 10:13:52 +1000 | [diff] [blame] | 1969 | xfs_dinode_t *last_dip = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1970 | short bucket_index; |
Nathan Scott | 6fdf8cc | 2006-06-28 10:13:52 +1000 | [diff] [blame] | 1971 | int offset, last_offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1972 | int error; |
| 1973 | int agi_ok; |
| 1974 | |
| 1975 | /* |
| 1976 | * First pull the on-disk inode from the AGI unlinked list. |
| 1977 | */ |
| 1978 | mp = tp->t_mountp; |
| 1979 | |
| 1980 | agno = XFS_INO_TO_AGNO(mp, ip->i_ino); |
| 1981 | agdaddr = XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)); |
| 1982 | |
| 1983 | /* |
| 1984 | * Get the agi buffer first. It ensures lock ordering |
| 1985 | * on the list. |
| 1986 | */ |
| 1987 | error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, agdaddr, |
| 1988 | XFS_FSS_TO_BB(mp, 1), 0, &agibp); |
| 1989 | if (error) { |
| 1990 | cmn_err(CE_WARN, |
| 1991 | "xfs_iunlink_remove: xfs_trans_read_buf() returned an error %d on %s. Returning error.", |
| 1992 | error, mp->m_fsname); |
| 1993 | return error; |
| 1994 | } |
| 1995 | /* |
| 1996 | * Validate the magic number of the agi block. |
| 1997 | */ |
| 1998 | agi = XFS_BUF_TO_AGI(agibp); |
| 1999 | agi_ok = |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 2000 | be32_to_cpu(agi->agi_magicnum) == XFS_AGI_MAGIC && |
| 2001 | XFS_AGI_GOOD_VERSION(be32_to_cpu(agi->agi_versionnum)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2002 | if (unlikely(XFS_TEST_ERROR(!agi_ok, mp, XFS_ERRTAG_IUNLINK_REMOVE, |
| 2003 | XFS_RANDOM_IUNLINK_REMOVE))) { |
| 2004 | XFS_CORRUPTION_ERROR("xfs_iunlink_remove", XFS_ERRLEVEL_LOW, |
| 2005 | mp, agi); |
| 2006 | xfs_trans_brelse(tp, agibp); |
| 2007 | cmn_err(CE_WARN, |
| 2008 | "xfs_iunlink_remove: XFS_TEST_ERROR() returned an error on %s. Returning EFSCORRUPTED.", |
| 2009 | mp->m_fsname); |
| 2010 | return XFS_ERROR(EFSCORRUPTED); |
| 2011 | } |
| 2012 | /* |
| 2013 | * Get the index into the agi hash table for the |
| 2014 | * list this inode will go on. |
| 2015 | */ |
| 2016 | agino = XFS_INO_TO_AGINO(mp, ip->i_ino); |
| 2017 | ASSERT(agino != 0); |
| 2018 | bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS; |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 2019 | ASSERT(be32_to_cpu(agi->agi_unlinked[bucket_index]) != NULLAGINO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2020 | ASSERT(agi->agi_unlinked[bucket_index]); |
| 2021 | |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 2022 | if (be32_to_cpu(agi->agi_unlinked[bucket_index]) == agino) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2023 | /* |
| 2024 | * We're at the head of the list. Get the inode's |
| 2025 | * on-disk buffer to see if there is anyone after us |
| 2026 | * on the list. Only modify our next pointer if it |
| 2027 | * is not already NULLAGINO. This saves us the overhead |
| 2028 | * of dealing with the buffer when there is no need to |
| 2029 | * change it. |
| 2030 | */ |
Nathan Scott | b12dd34 | 2006-03-17 17:26:04 +1100 | [diff] [blame] | 2031 | error = xfs_itobp(mp, tp, ip, &dip, &ibp, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2032 | if (error) { |
| 2033 | cmn_err(CE_WARN, |
| 2034 | "xfs_iunlink_remove: xfs_itobp() returned an error %d on %s. Returning error.", |
| 2035 | error, mp->m_fsname); |
| 2036 | return error; |
| 2037 | } |
| 2038 | next_agino = INT_GET(dip->di_next_unlinked, ARCH_CONVERT); |
| 2039 | ASSERT(next_agino != 0); |
| 2040 | if (next_agino != NULLAGINO) { |
| 2041 | INT_SET(dip->di_next_unlinked, ARCH_CONVERT, NULLAGINO); |
| 2042 | offset = ip->i_boffset + |
| 2043 | offsetof(xfs_dinode_t, di_next_unlinked); |
| 2044 | xfs_trans_inode_buf(tp, ibp); |
| 2045 | xfs_trans_log_buf(tp, ibp, offset, |
| 2046 | (offset + sizeof(xfs_agino_t) - 1)); |
| 2047 | xfs_inobp_check(mp, ibp); |
| 2048 | } else { |
| 2049 | xfs_trans_brelse(tp, ibp); |
| 2050 | } |
| 2051 | /* |
| 2052 | * Point the bucket head pointer at the next inode. |
| 2053 | */ |
| 2054 | ASSERT(next_agino != 0); |
| 2055 | ASSERT(next_agino != agino); |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 2056 | agi->agi_unlinked[bucket_index] = cpu_to_be32(next_agino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2057 | offset = offsetof(xfs_agi_t, agi_unlinked) + |
| 2058 | (sizeof(xfs_agino_t) * bucket_index); |
| 2059 | xfs_trans_log_buf(tp, agibp, offset, |
| 2060 | (offset + sizeof(xfs_agino_t) - 1)); |
| 2061 | } else { |
| 2062 | /* |
| 2063 | * We need to search the list for the inode being freed. |
| 2064 | */ |
Christoph Hellwig | 16259e7 | 2005-11-02 15:11:25 +1100 | [diff] [blame] | 2065 | next_agino = be32_to_cpu(agi->agi_unlinked[bucket_index]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2066 | last_ibp = NULL; |
| 2067 | while (next_agino != agino) { |
| 2068 | /* |
| 2069 | * If the last inode wasn't the one pointing to |
| 2070 | * us, then release its buffer since we're not |
| 2071 | * going to do anything with it. |
| 2072 | */ |
| 2073 | if (last_ibp != NULL) { |
| 2074 | xfs_trans_brelse(tp, last_ibp); |
| 2075 | } |
| 2076 | next_ino = XFS_AGINO_TO_INO(mp, agno, next_agino); |
| 2077 | error = xfs_inotobp(mp, tp, next_ino, &last_dip, |
| 2078 | &last_ibp, &last_offset); |
| 2079 | if (error) { |
| 2080 | cmn_err(CE_WARN, |
| 2081 | "xfs_iunlink_remove: xfs_inotobp() returned an error %d on %s. Returning error.", |
| 2082 | error, mp->m_fsname); |
| 2083 | return error; |
| 2084 | } |
| 2085 | next_agino = INT_GET(last_dip->di_next_unlinked, ARCH_CONVERT); |
| 2086 | ASSERT(next_agino != NULLAGINO); |
| 2087 | ASSERT(next_agino != 0); |
| 2088 | } |
| 2089 | /* |
| 2090 | * Now last_ibp points to the buffer previous to us on |
| 2091 | * the unlinked list. Pull us from the list. |
| 2092 | */ |
Nathan Scott | b12dd34 | 2006-03-17 17:26:04 +1100 | [diff] [blame] | 2093 | error = xfs_itobp(mp, tp, ip, &dip, &ibp, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2094 | if (error) { |
| 2095 | cmn_err(CE_WARN, |
| 2096 | "xfs_iunlink_remove: xfs_itobp() returned an error %d on %s. Returning error.", |
| 2097 | error, mp->m_fsname); |
| 2098 | return error; |
| 2099 | } |
| 2100 | next_agino = INT_GET(dip->di_next_unlinked, ARCH_CONVERT); |
| 2101 | ASSERT(next_agino != 0); |
| 2102 | ASSERT(next_agino != agino); |
| 2103 | if (next_agino != NULLAGINO) { |
| 2104 | INT_SET(dip->di_next_unlinked, ARCH_CONVERT, NULLAGINO); |
| 2105 | offset = ip->i_boffset + |
| 2106 | offsetof(xfs_dinode_t, di_next_unlinked); |
| 2107 | xfs_trans_inode_buf(tp, ibp); |
| 2108 | xfs_trans_log_buf(tp, ibp, offset, |
| 2109 | (offset + sizeof(xfs_agino_t) - 1)); |
| 2110 | xfs_inobp_check(mp, ibp); |
| 2111 | } else { |
| 2112 | xfs_trans_brelse(tp, ibp); |
| 2113 | } |
| 2114 | /* |
| 2115 | * Point the previous inode on the list to the next inode. |
| 2116 | */ |
| 2117 | INT_SET(last_dip->di_next_unlinked, ARCH_CONVERT, next_agino); |
| 2118 | ASSERT(next_agino != 0); |
| 2119 | offset = last_offset + offsetof(xfs_dinode_t, di_next_unlinked); |
| 2120 | xfs_trans_inode_buf(tp, last_ibp); |
| 2121 | xfs_trans_log_buf(tp, last_ibp, offset, |
| 2122 | (offset + sizeof(xfs_agino_t) - 1)); |
| 2123 | xfs_inobp_check(mp, last_ibp); |
| 2124 | } |
| 2125 | return 0; |
| 2126 | } |
| 2127 | |
| 2128 | static __inline__ int xfs_inode_clean(xfs_inode_t *ip) |
| 2129 | { |
| 2130 | return (((ip->i_itemp == NULL) || |
| 2131 | !(ip->i_itemp->ili_format.ilf_fields & XFS_ILOG_ALL)) && |
| 2132 | (ip->i_update_core == 0)); |
| 2133 | } |
| 2134 | |
Christoph Hellwig | ba0f32d | 2005-06-21 15:36:52 +1000 | [diff] [blame] | 2135 | STATIC void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2136 | xfs_ifree_cluster( |
| 2137 | xfs_inode_t *free_ip, |
| 2138 | xfs_trans_t *tp, |
| 2139 | xfs_ino_t inum) |
| 2140 | { |
| 2141 | xfs_mount_t *mp = free_ip->i_mount; |
| 2142 | int blks_per_cluster; |
| 2143 | int nbufs; |
| 2144 | int ninodes; |
| 2145 | int i, j, found, pre_flushed; |
| 2146 | xfs_daddr_t blkno; |
| 2147 | xfs_buf_t *bp; |
| 2148 | xfs_ihash_t *ih; |
| 2149 | xfs_inode_t *ip, **ip_found; |
| 2150 | xfs_inode_log_item_t *iip; |
| 2151 | xfs_log_item_t *lip; |
| 2152 | SPLDECL(s); |
| 2153 | |
| 2154 | if (mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp)) { |
| 2155 | blks_per_cluster = 1; |
| 2156 | ninodes = mp->m_sb.sb_inopblock; |
| 2157 | nbufs = XFS_IALLOC_BLOCKS(mp); |
| 2158 | } else { |
| 2159 | blks_per_cluster = XFS_INODE_CLUSTER_SIZE(mp) / |
| 2160 | mp->m_sb.sb_blocksize; |
| 2161 | ninodes = blks_per_cluster * mp->m_sb.sb_inopblock; |
| 2162 | nbufs = XFS_IALLOC_BLOCKS(mp) / blks_per_cluster; |
| 2163 | } |
| 2164 | |
| 2165 | ip_found = kmem_alloc(ninodes * sizeof(xfs_inode_t *), KM_NOFS); |
| 2166 | |
| 2167 | for (j = 0; j < nbufs; j++, inum += ninodes) { |
| 2168 | blkno = XFS_AGB_TO_DADDR(mp, XFS_INO_TO_AGNO(mp, inum), |
| 2169 | XFS_INO_TO_AGBNO(mp, inum)); |
| 2170 | |
| 2171 | |
| 2172 | /* |
| 2173 | * Look for each inode in memory and attempt to lock it, |
| 2174 | * we can be racing with flush and tail pushing here. |
| 2175 | * any inode we get the locks on, add to an array of |
| 2176 | * inode items to process later. |
| 2177 | * |
| 2178 | * The get the buffer lock, we could beat a flush |
| 2179 | * or tail pushing thread to the lock here, in which |
| 2180 | * case they will go looking for the inode buffer |
| 2181 | * and fail, we need some other form of interlock |
| 2182 | * here. |
| 2183 | */ |
| 2184 | found = 0; |
| 2185 | for (i = 0; i < ninodes; i++) { |
| 2186 | ih = XFS_IHASH(mp, inum + i); |
| 2187 | read_lock(&ih->ih_lock); |
| 2188 | for (ip = ih->ih_next; ip != NULL; ip = ip->i_next) { |
| 2189 | if (ip->i_ino == inum + i) |
| 2190 | break; |
| 2191 | } |
| 2192 | |
| 2193 | /* Inode not in memory or we found it already, |
| 2194 | * nothing to do |
| 2195 | */ |
| 2196 | if (!ip || (ip->i_flags & XFS_ISTALE)) { |
| 2197 | read_unlock(&ih->ih_lock); |
| 2198 | continue; |
| 2199 | } |
| 2200 | |
| 2201 | if (xfs_inode_clean(ip)) { |
| 2202 | read_unlock(&ih->ih_lock); |
| 2203 | continue; |
| 2204 | } |
| 2205 | |
| 2206 | /* If we can get the locks then add it to the |
| 2207 | * list, otherwise by the time we get the bp lock |
| 2208 | * below it will already be attached to the |
| 2209 | * inode buffer. |
| 2210 | */ |
| 2211 | |
| 2212 | /* This inode will already be locked - by us, lets |
| 2213 | * keep it that way. |
| 2214 | */ |
| 2215 | |
| 2216 | if (ip == free_ip) { |
| 2217 | if (xfs_iflock_nowait(ip)) { |
David Chinner | f273ab8 | 2006-09-28 11:06:03 +1000 | [diff] [blame] | 2218 | spin_lock(&ip->i_flags_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2219 | ip->i_flags |= XFS_ISTALE; |
David Chinner | f273ab8 | 2006-09-28 11:06:03 +1000 | [diff] [blame] | 2220 | spin_unlock(&ip->i_flags_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2221 | |
| 2222 | if (xfs_inode_clean(ip)) { |
| 2223 | xfs_ifunlock(ip); |
| 2224 | } else { |
| 2225 | ip_found[found++] = ip; |
| 2226 | } |
| 2227 | } |
| 2228 | read_unlock(&ih->ih_lock); |
| 2229 | continue; |
| 2230 | } |
| 2231 | |
| 2232 | if (xfs_ilock_nowait(ip, XFS_ILOCK_EXCL)) { |
| 2233 | if (xfs_iflock_nowait(ip)) { |
David Chinner | f273ab8 | 2006-09-28 11:06:03 +1000 | [diff] [blame] | 2234 | spin_lock(&ip->i_flags_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2235 | ip->i_flags |= XFS_ISTALE; |
David Chinner | f273ab8 | 2006-09-28 11:06:03 +1000 | [diff] [blame] | 2236 | spin_unlock(&ip->i_flags_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2237 | |
| 2238 | if (xfs_inode_clean(ip)) { |
| 2239 | xfs_ifunlock(ip); |
| 2240 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| 2241 | } else { |
| 2242 | ip_found[found++] = ip; |
| 2243 | } |
| 2244 | } else { |
| 2245 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| 2246 | } |
| 2247 | } |
| 2248 | |
| 2249 | read_unlock(&ih->ih_lock); |
| 2250 | } |
| 2251 | |
| 2252 | bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, blkno, |
| 2253 | mp->m_bsize * blks_per_cluster, |
| 2254 | XFS_BUF_LOCK); |
| 2255 | |
| 2256 | pre_flushed = 0; |
| 2257 | lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *); |
| 2258 | while (lip) { |
| 2259 | if (lip->li_type == XFS_LI_INODE) { |
| 2260 | iip = (xfs_inode_log_item_t *)lip; |
| 2261 | ASSERT(iip->ili_logged == 1); |
| 2262 | lip->li_cb = (void(*)(xfs_buf_t*,xfs_log_item_t*)) xfs_istale_done; |
| 2263 | AIL_LOCK(mp,s); |
| 2264 | iip->ili_flush_lsn = iip->ili_item.li_lsn; |
| 2265 | AIL_UNLOCK(mp, s); |
David Chinner | f273ab8 | 2006-09-28 11:06:03 +1000 | [diff] [blame] | 2266 | spin_lock(&iip->ili_inode->i_flags_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2267 | iip->ili_inode->i_flags |= XFS_ISTALE; |
David Chinner | f273ab8 | 2006-09-28 11:06:03 +1000 | [diff] [blame] | 2268 | spin_unlock(&iip->ili_inode->i_flags_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2269 | pre_flushed++; |
| 2270 | } |
| 2271 | lip = lip->li_bio_list; |
| 2272 | } |
| 2273 | |
| 2274 | for (i = 0; i < found; i++) { |
| 2275 | ip = ip_found[i]; |
| 2276 | iip = ip->i_itemp; |
| 2277 | |
| 2278 | if (!iip) { |
| 2279 | ip->i_update_core = 0; |
| 2280 | xfs_ifunlock(ip); |
| 2281 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| 2282 | continue; |
| 2283 | } |
| 2284 | |
| 2285 | iip->ili_last_fields = iip->ili_format.ilf_fields; |
| 2286 | iip->ili_format.ilf_fields = 0; |
| 2287 | iip->ili_logged = 1; |
| 2288 | AIL_LOCK(mp,s); |
| 2289 | iip->ili_flush_lsn = iip->ili_item.li_lsn; |
| 2290 | AIL_UNLOCK(mp, s); |
| 2291 | |
| 2292 | xfs_buf_attach_iodone(bp, |
| 2293 | (void(*)(xfs_buf_t*,xfs_log_item_t*)) |
| 2294 | xfs_istale_done, (xfs_log_item_t *)iip); |
| 2295 | if (ip != free_ip) { |
| 2296 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| 2297 | } |
| 2298 | } |
| 2299 | |
| 2300 | if (found || pre_flushed) |
| 2301 | xfs_trans_stale_inode_buf(tp, bp); |
| 2302 | xfs_trans_binval(tp, bp); |
| 2303 | } |
| 2304 | |
| 2305 | kmem_free(ip_found, ninodes * sizeof(xfs_inode_t *)); |
| 2306 | } |
| 2307 | |
| 2308 | /* |
| 2309 | * This is called to return an inode to the inode free list. |
| 2310 | * The inode should already be truncated to 0 length and have |
| 2311 | * no pages associated with it. This routine also assumes that |
| 2312 | * the inode is already a part of the transaction. |
| 2313 | * |
| 2314 | * The on-disk copy of the inode will have been added to the list |
| 2315 | * of unlinked inodes in the AGI. We need to remove the inode from |
| 2316 | * that list atomically with respect to freeing it here. |
| 2317 | */ |
| 2318 | int |
| 2319 | xfs_ifree( |
| 2320 | xfs_trans_t *tp, |
| 2321 | xfs_inode_t *ip, |
| 2322 | xfs_bmap_free_t *flist) |
| 2323 | { |
| 2324 | int error; |
| 2325 | int delete; |
| 2326 | xfs_ino_t first_ino; |
| 2327 | |
| 2328 | ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE)); |
| 2329 | ASSERT(ip->i_transp == tp); |
| 2330 | ASSERT(ip->i_d.di_nlink == 0); |
| 2331 | ASSERT(ip->i_d.di_nextents == 0); |
| 2332 | ASSERT(ip->i_d.di_anextents == 0); |
| 2333 | ASSERT((ip->i_d.di_size == 0) || |
| 2334 | ((ip->i_d.di_mode & S_IFMT) != S_IFREG)); |
| 2335 | ASSERT(ip->i_d.di_nblocks == 0); |
| 2336 | |
| 2337 | /* |
| 2338 | * Pull the on-disk inode from the AGI unlinked list. |
| 2339 | */ |
| 2340 | error = xfs_iunlink_remove(tp, ip); |
| 2341 | if (error != 0) { |
| 2342 | return error; |
| 2343 | } |
| 2344 | |
| 2345 | error = xfs_difree(tp, ip->i_ino, flist, &delete, &first_ino); |
| 2346 | if (error != 0) { |
| 2347 | return error; |
| 2348 | } |
| 2349 | ip->i_d.di_mode = 0; /* mark incore inode as free */ |
| 2350 | ip->i_d.di_flags = 0; |
| 2351 | ip->i_d.di_dmevmask = 0; |
| 2352 | ip->i_d.di_forkoff = 0; /* mark the attr fork not in use */ |
| 2353 | ip->i_df.if_ext_max = |
| 2354 | XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t); |
| 2355 | ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS; |
| 2356 | ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS; |
| 2357 | /* |
| 2358 | * Bump the generation count so no one will be confused |
| 2359 | * by reincarnations of this inode. |
| 2360 | */ |
| 2361 | ip->i_d.di_gen++; |
| 2362 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
| 2363 | |
| 2364 | if (delete) { |
| 2365 | xfs_ifree_cluster(ip, tp, first_ino); |
| 2366 | } |
| 2367 | |
| 2368 | return 0; |
| 2369 | } |
| 2370 | |
| 2371 | /* |
| 2372 | * Reallocate the space for if_broot based on the number of records |
| 2373 | * being added or deleted as indicated in rec_diff. Move the records |
| 2374 | * and pointers in if_broot to fit the new size. When shrinking this |
| 2375 | * will eliminate holes between the records and pointers created by |
| 2376 | * the caller. When growing this will create holes to be filled in |
| 2377 | * by the caller. |
| 2378 | * |
| 2379 | * The caller must not request to add more records than would fit in |
| 2380 | * the on-disk inode root. If the if_broot is currently NULL, then |
| 2381 | * if we adding records one will be allocated. The caller must also |
| 2382 | * not request that the number of records go below zero, although |
| 2383 | * it can go to zero. |
| 2384 | * |
| 2385 | * ip -- the inode whose if_broot area is changing |
| 2386 | * ext_diff -- the change in the number of records, positive or negative, |
| 2387 | * requested for the if_broot array. |
| 2388 | */ |
| 2389 | void |
| 2390 | xfs_iroot_realloc( |
| 2391 | xfs_inode_t *ip, |
| 2392 | int rec_diff, |
| 2393 | int whichfork) |
| 2394 | { |
| 2395 | int cur_max; |
| 2396 | xfs_ifork_t *ifp; |
| 2397 | xfs_bmbt_block_t *new_broot; |
| 2398 | int new_max; |
| 2399 | size_t new_size; |
| 2400 | char *np; |
| 2401 | char *op; |
| 2402 | |
| 2403 | /* |
| 2404 | * Handle the degenerate case quietly. |
| 2405 | */ |
| 2406 | if (rec_diff == 0) { |
| 2407 | return; |
| 2408 | } |
| 2409 | |
| 2410 | ifp = XFS_IFORK_PTR(ip, whichfork); |
| 2411 | if (rec_diff > 0) { |
| 2412 | /* |
| 2413 | * If there wasn't any memory allocated before, just |
| 2414 | * allocate it now and get out. |
| 2415 | */ |
| 2416 | if (ifp->if_broot_bytes == 0) { |
| 2417 | new_size = (size_t)XFS_BMAP_BROOT_SPACE_CALC(rec_diff); |
| 2418 | ifp->if_broot = (xfs_bmbt_block_t*)kmem_alloc(new_size, |
| 2419 | KM_SLEEP); |
| 2420 | ifp->if_broot_bytes = (int)new_size; |
| 2421 | return; |
| 2422 | } |
| 2423 | |
| 2424 | /* |
| 2425 | * If there is already an existing if_broot, then we need |
| 2426 | * to realloc() it and shift the pointers to their new |
| 2427 | * location. The records don't change location because |
| 2428 | * they are kept butted up against the btree block header. |
| 2429 | */ |
| 2430 | cur_max = XFS_BMAP_BROOT_MAXRECS(ifp->if_broot_bytes); |
| 2431 | new_max = cur_max + rec_diff; |
| 2432 | new_size = (size_t)XFS_BMAP_BROOT_SPACE_CALC(new_max); |
| 2433 | ifp->if_broot = (xfs_bmbt_block_t *) |
| 2434 | kmem_realloc(ifp->if_broot, |
| 2435 | new_size, |
| 2436 | (size_t)XFS_BMAP_BROOT_SPACE_CALC(cur_max), /* old size */ |
| 2437 | KM_SLEEP); |
| 2438 | op = (char *)XFS_BMAP_BROOT_PTR_ADDR(ifp->if_broot, 1, |
| 2439 | ifp->if_broot_bytes); |
| 2440 | np = (char *)XFS_BMAP_BROOT_PTR_ADDR(ifp->if_broot, 1, |
| 2441 | (int)new_size); |
| 2442 | ifp->if_broot_bytes = (int)new_size; |
| 2443 | ASSERT(ifp->if_broot_bytes <= |
| 2444 | XFS_IFORK_SIZE(ip, whichfork) + XFS_BROOT_SIZE_ADJ); |
| 2445 | memmove(np, op, cur_max * (uint)sizeof(xfs_dfsbno_t)); |
| 2446 | return; |
| 2447 | } |
| 2448 | |
| 2449 | /* |
| 2450 | * rec_diff is less than 0. In this case, we are shrinking the |
| 2451 | * if_broot buffer. It must already exist. If we go to zero |
| 2452 | * records, just get rid of the root and clear the status bit. |
| 2453 | */ |
| 2454 | ASSERT((ifp->if_broot != NULL) && (ifp->if_broot_bytes > 0)); |
| 2455 | cur_max = XFS_BMAP_BROOT_MAXRECS(ifp->if_broot_bytes); |
| 2456 | new_max = cur_max + rec_diff; |
| 2457 | ASSERT(new_max >= 0); |
| 2458 | if (new_max > 0) |
| 2459 | new_size = (size_t)XFS_BMAP_BROOT_SPACE_CALC(new_max); |
| 2460 | else |
| 2461 | new_size = 0; |
| 2462 | if (new_size > 0) { |
| 2463 | new_broot = (xfs_bmbt_block_t *)kmem_alloc(new_size, KM_SLEEP); |
| 2464 | /* |
| 2465 | * First copy over the btree block header. |
| 2466 | */ |
| 2467 | memcpy(new_broot, ifp->if_broot, sizeof(xfs_bmbt_block_t)); |
| 2468 | } else { |
| 2469 | new_broot = NULL; |
| 2470 | ifp->if_flags &= ~XFS_IFBROOT; |
| 2471 | } |
| 2472 | |
| 2473 | /* |
| 2474 | * Only copy the records and pointers if there are any. |
| 2475 | */ |
| 2476 | if (new_max > 0) { |
| 2477 | /* |
| 2478 | * First copy the records. |
| 2479 | */ |
| 2480 | op = (char *)XFS_BMAP_BROOT_REC_ADDR(ifp->if_broot, 1, |
| 2481 | ifp->if_broot_bytes); |
| 2482 | np = (char *)XFS_BMAP_BROOT_REC_ADDR(new_broot, 1, |
| 2483 | (int)new_size); |
| 2484 | memcpy(np, op, new_max * (uint)sizeof(xfs_bmbt_rec_t)); |
| 2485 | |
| 2486 | /* |
| 2487 | * Then copy the pointers. |
| 2488 | */ |
| 2489 | op = (char *)XFS_BMAP_BROOT_PTR_ADDR(ifp->if_broot, 1, |
| 2490 | ifp->if_broot_bytes); |
| 2491 | np = (char *)XFS_BMAP_BROOT_PTR_ADDR(new_broot, 1, |
| 2492 | (int)new_size); |
| 2493 | memcpy(np, op, new_max * (uint)sizeof(xfs_dfsbno_t)); |
| 2494 | } |
| 2495 | kmem_free(ifp->if_broot, ifp->if_broot_bytes); |
| 2496 | ifp->if_broot = new_broot; |
| 2497 | ifp->if_broot_bytes = (int)new_size; |
| 2498 | ASSERT(ifp->if_broot_bytes <= |
| 2499 | XFS_IFORK_SIZE(ip, whichfork) + XFS_BROOT_SIZE_ADJ); |
| 2500 | return; |
| 2501 | } |
| 2502 | |
| 2503 | |
| 2504 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2505 | * This is called when the amount of space needed for if_data |
| 2506 | * is increased or decreased. The change in size is indicated by |
| 2507 | * the number of bytes that need to be added or deleted in the |
| 2508 | * byte_diff parameter. |
| 2509 | * |
| 2510 | * If the amount of space needed has decreased below the size of the |
| 2511 | * inline buffer, then switch to using the inline buffer. Otherwise, |
| 2512 | * use kmem_realloc() or kmem_alloc() to adjust the size of the buffer |
| 2513 | * to what is needed. |
| 2514 | * |
| 2515 | * ip -- the inode whose if_data area is changing |
| 2516 | * byte_diff -- the change in the number of bytes, positive or negative, |
| 2517 | * requested for the if_data array. |
| 2518 | */ |
| 2519 | void |
| 2520 | xfs_idata_realloc( |
| 2521 | xfs_inode_t *ip, |
| 2522 | int byte_diff, |
| 2523 | int whichfork) |
| 2524 | { |
| 2525 | xfs_ifork_t *ifp; |
| 2526 | int new_size; |
| 2527 | int real_size; |
| 2528 | |
| 2529 | if (byte_diff == 0) { |
| 2530 | return; |
| 2531 | } |
| 2532 | |
| 2533 | ifp = XFS_IFORK_PTR(ip, whichfork); |
| 2534 | new_size = (int)ifp->if_bytes + byte_diff; |
| 2535 | ASSERT(new_size >= 0); |
| 2536 | |
| 2537 | if (new_size == 0) { |
| 2538 | if (ifp->if_u1.if_data != ifp->if_u2.if_inline_data) { |
| 2539 | kmem_free(ifp->if_u1.if_data, ifp->if_real_bytes); |
| 2540 | } |
| 2541 | ifp->if_u1.if_data = NULL; |
| 2542 | real_size = 0; |
| 2543 | } else if (new_size <= sizeof(ifp->if_u2.if_inline_data)) { |
| 2544 | /* |
| 2545 | * If the valid extents/data can fit in if_inline_ext/data, |
| 2546 | * copy them from the malloc'd vector and free it. |
| 2547 | */ |
| 2548 | if (ifp->if_u1.if_data == NULL) { |
| 2549 | ifp->if_u1.if_data = ifp->if_u2.if_inline_data; |
| 2550 | } else if (ifp->if_u1.if_data != ifp->if_u2.if_inline_data) { |
| 2551 | ASSERT(ifp->if_real_bytes != 0); |
| 2552 | memcpy(ifp->if_u2.if_inline_data, ifp->if_u1.if_data, |
| 2553 | new_size); |
| 2554 | kmem_free(ifp->if_u1.if_data, ifp->if_real_bytes); |
| 2555 | ifp->if_u1.if_data = ifp->if_u2.if_inline_data; |
| 2556 | } |
| 2557 | real_size = 0; |
| 2558 | } else { |
| 2559 | /* |
| 2560 | * Stuck with malloc/realloc. |
| 2561 | * For inline data, the underlying buffer must be |
| 2562 | * a multiple of 4 bytes in size so that it can be |
| 2563 | * logged and stay on word boundaries. We enforce |
| 2564 | * that here. |
| 2565 | */ |
| 2566 | real_size = roundup(new_size, 4); |
| 2567 | if (ifp->if_u1.if_data == NULL) { |
| 2568 | ASSERT(ifp->if_real_bytes == 0); |
| 2569 | ifp->if_u1.if_data = kmem_alloc(real_size, KM_SLEEP); |
| 2570 | } else if (ifp->if_u1.if_data != ifp->if_u2.if_inline_data) { |
| 2571 | /* |
| 2572 | * Only do the realloc if the underlying size |
| 2573 | * is really changing. |
| 2574 | */ |
| 2575 | if (ifp->if_real_bytes != real_size) { |
| 2576 | ifp->if_u1.if_data = |
| 2577 | kmem_realloc(ifp->if_u1.if_data, |
| 2578 | real_size, |
| 2579 | ifp->if_real_bytes, |
| 2580 | KM_SLEEP); |
| 2581 | } |
| 2582 | } else { |
| 2583 | ASSERT(ifp->if_real_bytes == 0); |
| 2584 | ifp->if_u1.if_data = kmem_alloc(real_size, KM_SLEEP); |
| 2585 | memcpy(ifp->if_u1.if_data, ifp->if_u2.if_inline_data, |
| 2586 | ifp->if_bytes); |
| 2587 | } |
| 2588 | } |
| 2589 | ifp->if_real_bytes = real_size; |
| 2590 | ifp->if_bytes = new_size; |
| 2591 | ASSERT(ifp->if_bytes <= XFS_IFORK_SIZE(ip, whichfork)); |
| 2592 | } |
| 2593 | |
| 2594 | |
| 2595 | |
| 2596 | |
| 2597 | /* |
| 2598 | * Map inode to disk block and offset. |
| 2599 | * |
| 2600 | * mp -- the mount point structure for the current file system |
| 2601 | * tp -- the current transaction |
| 2602 | * ino -- the inode number of the inode to be located |
| 2603 | * imap -- this structure is filled in with the information necessary |
| 2604 | * to retrieve the given inode from disk |
| 2605 | * flags -- flags to pass to xfs_dilocate indicating whether or not |
| 2606 | * lookups in the inode btree were OK or not |
| 2607 | */ |
| 2608 | int |
| 2609 | xfs_imap( |
| 2610 | xfs_mount_t *mp, |
| 2611 | xfs_trans_t *tp, |
| 2612 | xfs_ino_t ino, |
| 2613 | xfs_imap_t *imap, |
| 2614 | uint flags) |
| 2615 | { |
| 2616 | xfs_fsblock_t fsbno; |
| 2617 | int len; |
| 2618 | int off; |
| 2619 | int error; |
| 2620 | |
| 2621 | fsbno = imap->im_blkno ? |
| 2622 | XFS_DADDR_TO_FSB(mp, imap->im_blkno) : NULLFSBLOCK; |
| 2623 | error = xfs_dilocate(mp, tp, ino, &fsbno, &len, &off, flags); |
| 2624 | if (error != 0) { |
| 2625 | return error; |
| 2626 | } |
| 2627 | imap->im_blkno = XFS_FSB_TO_DADDR(mp, fsbno); |
| 2628 | imap->im_len = XFS_FSB_TO_BB(mp, len); |
| 2629 | imap->im_agblkno = XFS_FSB_TO_AGBNO(mp, fsbno); |
| 2630 | imap->im_ioffset = (ushort)off; |
| 2631 | imap->im_boffset = (ushort)(off << mp->m_sb.sb_inodelog); |
| 2632 | return 0; |
| 2633 | } |
| 2634 | |
| 2635 | void |
| 2636 | xfs_idestroy_fork( |
| 2637 | xfs_inode_t *ip, |
| 2638 | int whichfork) |
| 2639 | { |
| 2640 | xfs_ifork_t *ifp; |
| 2641 | |
| 2642 | ifp = XFS_IFORK_PTR(ip, whichfork); |
| 2643 | if (ifp->if_broot != NULL) { |
| 2644 | kmem_free(ifp->if_broot, ifp->if_broot_bytes); |
| 2645 | ifp->if_broot = NULL; |
| 2646 | } |
| 2647 | |
| 2648 | /* |
| 2649 | * If the format is local, then we can't have an extents |
| 2650 | * array so just look for an inline data array. If we're |
| 2651 | * not local then we may or may not have an extents list, |
| 2652 | * so check and free it up if we do. |
| 2653 | */ |
| 2654 | if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) { |
| 2655 | if ((ifp->if_u1.if_data != ifp->if_u2.if_inline_data) && |
| 2656 | (ifp->if_u1.if_data != NULL)) { |
| 2657 | ASSERT(ifp->if_real_bytes != 0); |
| 2658 | kmem_free(ifp->if_u1.if_data, ifp->if_real_bytes); |
| 2659 | ifp->if_u1.if_data = NULL; |
| 2660 | ifp->if_real_bytes = 0; |
| 2661 | } |
| 2662 | } else if ((ifp->if_flags & XFS_IFEXTENTS) && |
Mandy Kirkconnell | 0293ce3 | 2006-03-14 13:30:23 +1100 | [diff] [blame] | 2663 | ((ifp->if_flags & XFS_IFEXTIREC) || |
| 2664 | ((ifp->if_u1.if_extents != NULL) && |
| 2665 | (ifp->if_u1.if_extents != ifp->if_u2.if_inline_ext)))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2666 | ASSERT(ifp->if_real_bytes != 0); |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 2667 | xfs_iext_destroy(ifp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2668 | } |
| 2669 | ASSERT(ifp->if_u1.if_extents == NULL || |
| 2670 | ifp->if_u1.if_extents == ifp->if_u2.if_inline_ext); |
| 2671 | ASSERT(ifp->if_real_bytes == 0); |
| 2672 | if (whichfork == XFS_ATTR_FORK) { |
| 2673 | kmem_zone_free(xfs_ifork_zone, ip->i_afp); |
| 2674 | ip->i_afp = NULL; |
| 2675 | } |
| 2676 | } |
| 2677 | |
| 2678 | /* |
| 2679 | * This is called free all the memory associated with an inode. |
| 2680 | * It must free the inode itself and any buffers allocated for |
| 2681 | * if_extents/if_data and if_broot. It must also free the lock |
| 2682 | * associated with the inode. |
| 2683 | */ |
| 2684 | void |
| 2685 | xfs_idestroy( |
| 2686 | xfs_inode_t *ip) |
| 2687 | { |
| 2688 | |
| 2689 | switch (ip->i_d.di_mode & S_IFMT) { |
| 2690 | case S_IFREG: |
| 2691 | case S_IFDIR: |
| 2692 | case S_IFLNK: |
| 2693 | xfs_idestroy_fork(ip, XFS_DATA_FORK); |
| 2694 | break; |
| 2695 | } |
| 2696 | if (ip->i_afp) |
| 2697 | xfs_idestroy_fork(ip, XFS_ATTR_FORK); |
| 2698 | mrfree(&ip->i_lock); |
| 2699 | mrfree(&ip->i_iolock); |
| 2700 | freesema(&ip->i_flock); |
| 2701 | #ifdef XFS_BMAP_TRACE |
| 2702 | ktrace_free(ip->i_xtrace); |
| 2703 | #endif |
| 2704 | #ifdef XFS_BMBT_TRACE |
| 2705 | ktrace_free(ip->i_btrace); |
| 2706 | #endif |
| 2707 | #ifdef XFS_RW_TRACE |
| 2708 | ktrace_free(ip->i_rwtrace); |
| 2709 | #endif |
| 2710 | #ifdef XFS_ILOCK_TRACE |
| 2711 | ktrace_free(ip->i_lock_trace); |
| 2712 | #endif |
| 2713 | #ifdef XFS_DIR2_TRACE |
| 2714 | ktrace_free(ip->i_dir_trace); |
| 2715 | #endif |
| 2716 | if (ip->i_itemp) { |
| 2717 | /* XXXdpd should be able to assert this but shutdown |
| 2718 | * is leaving the AIL behind. */ |
| 2719 | ASSERT(((ip->i_itemp->ili_item.li_flags & XFS_LI_IN_AIL) == 0) || |
| 2720 | XFS_FORCED_SHUTDOWN(ip->i_mount)); |
| 2721 | xfs_inode_item_destroy(ip); |
| 2722 | } |
| 2723 | kmem_zone_free(xfs_inode_zone, ip); |
| 2724 | } |
| 2725 | |
| 2726 | |
| 2727 | /* |
| 2728 | * Increment the pin count of the given buffer. |
| 2729 | * This value is protected by ipinlock spinlock in the mount structure. |
| 2730 | */ |
| 2731 | void |
| 2732 | xfs_ipin( |
| 2733 | xfs_inode_t *ip) |
| 2734 | { |
| 2735 | ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE)); |
| 2736 | |
| 2737 | atomic_inc(&ip->i_pincount); |
| 2738 | } |
| 2739 | |
| 2740 | /* |
| 2741 | * Decrement the pin count of the given inode, and wake up |
| 2742 | * anyone in xfs_iwait_unpin() if the count goes to 0. The |
Nathan Scott | c41564b | 2006-03-29 08:55:14 +1000 | [diff] [blame] | 2743 | * inode must have been previously pinned with a call to xfs_ipin(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2744 | */ |
| 2745 | void |
| 2746 | xfs_iunpin( |
| 2747 | xfs_inode_t *ip) |
| 2748 | { |
| 2749 | ASSERT(atomic_read(&ip->i_pincount) > 0); |
| 2750 | |
| 2751 | if (atomic_dec_and_test(&ip->i_pincount)) { |
David Chinner | 58829e4 | 2006-04-11 15:11:20 +1000 | [diff] [blame] | 2752 | /* |
| 2753 | * If the inode is currently being reclaimed, the |
| 2754 | * linux inode _and_ the xfs vnode may have been |
| 2755 | * freed so we cannot reference either of them safely. |
| 2756 | * Hence we should not try to do anything to them |
| 2757 | * if the xfs inode is currently in the reclaim |
| 2758 | * path. |
| 2759 | * |
| 2760 | * However, we still need to issue the unpin wakeup |
| 2761 | * call as the inode reclaim may be blocked waiting for |
| 2762 | * the inode to become unpinned. |
| 2763 | */ |
David Chinner | f273ab8 | 2006-09-28 11:06:03 +1000 | [diff] [blame] | 2764 | struct inode *inode = NULL; |
| 2765 | |
| 2766 | spin_lock(&ip->i_flags_lock); |
David Chinner | 58829e4 | 2006-04-11 15:11:20 +1000 | [diff] [blame] | 2767 | if (!(ip->i_flags & (XFS_IRECLAIM|XFS_IRECLAIMABLE))) { |
Nathan Scott | 67fcaa7 | 2006-06-09 17:00:52 +1000 | [diff] [blame] | 2768 | bhv_vnode_t *vp = XFS_ITOV_NULL(ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2769 | |
David Chinner | 58829e4 | 2006-04-11 15:11:20 +1000 | [diff] [blame] | 2770 | /* make sync come back and flush this inode */ |
| 2771 | if (vp) { |
David Chinner | f273ab8 | 2006-09-28 11:06:03 +1000 | [diff] [blame] | 2772 | inode = vn_to_inode(vp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2773 | |
David Chinner | 7142508 | 2006-06-09 14:55:52 +1000 | [diff] [blame] | 2774 | if (!(inode->i_state & |
David Chinner | f273ab8 | 2006-09-28 11:06:03 +1000 | [diff] [blame] | 2775 | (I_NEW|I_FREEING|I_CLEAR))) { |
| 2776 | inode = igrab(inode); |
| 2777 | if (inode) |
| 2778 | mark_inode_dirty_sync(inode); |
| 2779 | } else |
| 2780 | inode = NULL; |
David Chinner | 58829e4 | 2006-04-11 15:11:20 +1000 | [diff] [blame] | 2781 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2782 | } |
David Chinner | f273ab8 | 2006-09-28 11:06:03 +1000 | [diff] [blame] | 2783 | spin_unlock(&ip->i_flags_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2784 | wake_up(&ip->i_ipin_wait); |
David Chinner | f273ab8 | 2006-09-28 11:06:03 +1000 | [diff] [blame] | 2785 | if (inode) |
| 2786 | iput(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2787 | } |
| 2788 | } |
| 2789 | |
| 2790 | /* |
| 2791 | * This is called to wait for the given inode to be unpinned. |
| 2792 | * It will sleep until this happens. The caller must have the |
| 2793 | * inode locked in at least shared mode so that the buffer cannot |
| 2794 | * be subsequently pinned once someone is waiting for it to be |
| 2795 | * unpinned. |
| 2796 | */ |
Christoph Hellwig | ba0f32d | 2005-06-21 15:36:52 +1000 | [diff] [blame] | 2797 | STATIC void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2798 | xfs_iunpin_wait( |
| 2799 | xfs_inode_t *ip) |
| 2800 | { |
| 2801 | xfs_inode_log_item_t *iip; |
| 2802 | xfs_lsn_t lsn; |
| 2803 | |
| 2804 | ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE | MR_ACCESS)); |
| 2805 | |
| 2806 | if (atomic_read(&ip->i_pincount) == 0) { |
| 2807 | return; |
| 2808 | } |
| 2809 | |
| 2810 | iip = ip->i_itemp; |
| 2811 | if (iip && iip->ili_last_lsn) { |
| 2812 | lsn = iip->ili_last_lsn; |
| 2813 | } else { |
| 2814 | lsn = (xfs_lsn_t)0; |
| 2815 | } |
| 2816 | |
| 2817 | /* |
| 2818 | * Give the log a push so we don't wait here too long. |
| 2819 | */ |
| 2820 | xfs_log_force(ip->i_mount, lsn, XFS_LOG_FORCE); |
| 2821 | |
| 2822 | wait_event(ip->i_ipin_wait, (atomic_read(&ip->i_pincount) == 0)); |
| 2823 | } |
| 2824 | |
| 2825 | |
| 2826 | /* |
| 2827 | * xfs_iextents_copy() |
| 2828 | * |
| 2829 | * This is called to copy the REAL extents (as opposed to the delayed |
| 2830 | * allocation extents) from the inode into the given buffer. It |
| 2831 | * returns the number of bytes copied into the buffer. |
| 2832 | * |
| 2833 | * If there are no delayed allocation extents, then we can just |
| 2834 | * memcpy() the extents into the buffer. Otherwise, we need to |
| 2835 | * examine each extent in turn and skip those which are delayed. |
| 2836 | */ |
| 2837 | int |
| 2838 | xfs_iextents_copy( |
| 2839 | xfs_inode_t *ip, |
| 2840 | xfs_bmbt_rec_t *buffer, |
| 2841 | int whichfork) |
| 2842 | { |
| 2843 | int copied; |
| 2844 | xfs_bmbt_rec_t *dest_ep; |
| 2845 | xfs_bmbt_rec_t *ep; |
| 2846 | #ifdef XFS_BMAP_TRACE |
| 2847 | static char fname[] = "xfs_iextents_copy"; |
| 2848 | #endif |
| 2849 | int i; |
| 2850 | xfs_ifork_t *ifp; |
| 2851 | int nrecs; |
| 2852 | xfs_fsblock_t start_block; |
| 2853 | |
| 2854 | ifp = XFS_IFORK_PTR(ip, whichfork); |
| 2855 | ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE|MR_ACCESS)); |
| 2856 | ASSERT(ifp->if_bytes > 0); |
| 2857 | |
| 2858 | nrecs = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); |
| 2859 | xfs_bmap_trace_exlist(fname, ip, nrecs, whichfork); |
| 2860 | ASSERT(nrecs > 0); |
| 2861 | |
| 2862 | /* |
| 2863 | * There are some delayed allocation extents in the |
| 2864 | * inode, so copy the extents one at a time and skip |
| 2865 | * the delayed ones. There must be at least one |
| 2866 | * non-delayed extent. |
| 2867 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2868 | dest_ep = buffer; |
| 2869 | copied = 0; |
| 2870 | for (i = 0; i < nrecs; i++) { |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 2871 | ep = xfs_iext_get_ext(ifp, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2872 | start_block = xfs_bmbt_get_startblock(ep); |
| 2873 | if (ISNULLSTARTBLOCK(start_block)) { |
| 2874 | /* |
| 2875 | * It's a delayed allocation extent, so skip it. |
| 2876 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2877 | continue; |
| 2878 | } |
| 2879 | |
| 2880 | /* Translate to on disk format */ |
| 2881 | put_unaligned(INT_GET(ep->l0, ARCH_CONVERT), |
| 2882 | (__uint64_t*)&dest_ep->l0); |
| 2883 | put_unaligned(INT_GET(ep->l1, ARCH_CONVERT), |
| 2884 | (__uint64_t*)&dest_ep->l1); |
| 2885 | dest_ep++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2886 | copied++; |
| 2887 | } |
| 2888 | ASSERT(copied != 0); |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 2889 | xfs_validate_extents(ifp, copied, 1, XFS_EXTFMT_INODE(ip)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2890 | |
| 2891 | return (copied * (uint)sizeof(xfs_bmbt_rec_t)); |
| 2892 | } |
| 2893 | |
| 2894 | /* |
| 2895 | * Each of the following cases stores data into the same region |
| 2896 | * of the on-disk inode, so only one of them can be valid at |
| 2897 | * any given time. While it is possible to have conflicting formats |
| 2898 | * and log flags, e.g. having XFS_ILOG_?DATA set when the fork is |
| 2899 | * in EXTENTS format, this can only happen when the fork has |
| 2900 | * changed formats after being modified but before being flushed. |
| 2901 | * In these cases, the format always takes precedence, because the |
| 2902 | * format indicates the current state of the fork. |
| 2903 | */ |
| 2904 | /*ARGSUSED*/ |
| 2905 | STATIC int |
| 2906 | xfs_iflush_fork( |
| 2907 | xfs_inode_t *ip, |
| 2908 | xfs_dinode_t *dip, |
| 2909 | xfs_inode_log_item_t *iip, |
| 2910 | int whichfork, |
| 2911 | xfs_buf_t *bp) |
| 2912 | { |
| 2913 | char *cp; |
| 2914 | xfs_ifork_t *ifp; |
| 2915 | xfs_mount_t *mp; |
| 2916 | #ifdef XFS_TRANS_DEBUG |
| 2917 | int first; |
| 2918 | #endif |
| 2919 | static const short brootflag[2] = |
| 2920 | { XFS_ILOG_DBROOT, XFS_ILOG_ABROOT }; |
| 2921 | static const short dataflag[2] = |
| 2922 | { XFS_ILOG_DDATA, XFS_ILOG_ADATA }; |
| 2923 | static const short extflag[2] = |
| 2924 | { XFS_ILOG_DEXT, XFS_ILOG_AEXT }; |
| 2925 | |
| 2926 | if (iip == NULL) |
| 2927 | return 0; |
| 2928 | ifp = XFS_IFORK_PTR(ip, whichfork); |
| 2929 | /* |
| 2930 | * This can happen if we gave up in iformat in an error path, |
| 2931 | * for the attribute fork. |
| 2932 | */ |
| 2933 | if (ifp == NULL) { |
| 2934 | ASSERT(whichfork == XFS_ATTR_FORK); |
| 2935 | return 0; |
| 2936 | } |
| 2937 | cp = XFS_DFORK_PTR(dip, whichfork); |
| 2938 | mp = ip->i_mount; |
| 2939 | switch (XFS_IFORK_FORMAT(ip, whichfork)) { |
| 2940 | case XFS_DINODE_FMT_LOCAL: |
| 2941 | if ((iip->ili_format.ilf_fields & dataflag[whichfork]) && |
| 2942 | (ifp->if_bytes > 0)) { |
| 2943 | ASSERT(ifp->if_u1.if_data != NULL); |
| 2944 | ASSERT(ifp->if_bytes <= XFS_IFORK_SIZE(ip, whichfork)); |
| 2945 | memcpy(cp, ifp->if_u1.if_data, ifp->if_bytes); |
| 2946 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2947 | break; |
| 2948 | |
| 2949 | case XFS_DINODE_FMT_EXTENTS: |
| 2950 | ASSERT((ifp->if_flags & XFS_IFEXTENTS) || |
| 2951 | !(iip->ili_format.ilf_fields & extflag[whichfork])); |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 2952 | ASSERT((xfs_iext_get_ext(ifp, 0) != NULL) || |
| 2953 | (ifp->if_bytes == 0)); |
| 2954 | ASSERT((xfs_iext_get_ext(ifp, 0) == NULL) || |
| 2955 | (ifp->if_bytes > 0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2956 | if ((iip->ili_format.ilf_fields & extflag[whichfork]) && |
| 2957 | (ifp->if_bytes > 0)) { |
| 2958 | ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) > 0); |
| 2959 | (void)xfs_iextents_copy(ip, (xfs_bmbt_rec_t *)cp, |
| 2960 | whichfork); |
| 2961 | } |
| 2962 | break; |
| 2963 | |
| 2964 | case XFS_DINODE_FMT_BTREE: |
| 2965 | if ((iip->ili_format.ilf_fields & brootflag[whichfork]) && |
| 2966 | (ifp->if_broot_bytes > 0)) { |
| 2967 | ASSERT(ifp->if_broot != NULL); |
| 2968 | ASSERT(ifp->if_broot_bytes <= |
| 2969 | (XFS_IFORK_SIZE(ip, whichfork) + |
| 2970 | XFS_BROOT_SIZE_ADJ)); |
| 2971 | xfs_bmbt_to_bmdr(ifp->if_broot, ifp->if_broot_bytes, |
| 2972 | (xfs_bmdr_block_t *)cp, |
| 2973 | XFS_DFORK_SIZE(dip, mp, whichfork)); |
| 2974 | } |
| 2975 | break; |
| 2976 | |
| 2977 | case XFS_DINODE_FMT_DEV: |
| 2978 | if (iip->ili_format.ilf_fields & XFS_ILOG_DEV) { |
| 2979 | ASSERT(whichfork == XFS_DATA_FORK); |
| 2980 | INT_SET(dip->di_u.di_dev, ARCH_CONVERT, ip->i_df.if_u2.if_rdev); |
| 2981 | } |
| 2982 | break; |
| 2983 | |
| 2984 | case XFS_DINODE_FMT_UUID: |
| 2985 | if (iip->ili_format.ilf_fields & XFS_ILOG_UUID) { |
| 2986 | ASSERT(whichfork == XFS_DATA_FORK); |
| 2987 | memcpy(&dip->di_u.di_muuid, &ip->i_df.if_u2.if_uuid, |
| 2988 | sizeof(uuid_t)); |
| 2989 | } |
| 2990 | break; |
| 2991 | |
| 2992 | default: |
| 2993 | ASSERT(0); |
| 2994 | break; |
| 2995 | } |
| 2996 | |
| 2997 | return 0; |
| 2998 | } |
| 2999 | |
| 3000 | /* |
| 3001 | * xfs_iflush() will write a modified inode's changes out to the |
| 3002 | * inode's on disk home. The caller must have the inode lock held |
| 3003 | * in at least shared mode and the inode flush semaphore must be |
| 3004 | * held as well. The inode lock will still be held upon return from |
| 3005 | * the call and the caller is free to unlock it. |
| 3006 | * The inode flush lock will be unlocked when the inode reaches the disk. |
| 3007 | * The flags indicate how the inode's buffer should be written out. |
| 3008 | */ |
| 3009 | int |
| 3010 | xfs_iflush( |
| 3011 | xfs_inode_t *ip, |
| 3012 | uint flags) |
| 3013 | { |
| 3014 | xfs_inode_log_item_t *iip; |
| 3015 | xfs_buf_t *bp; |
| 3016 | xfs_dinode_t *dip; |
| 3017 | xfs_mount_t *mp; |
| 3018 | int error; |
| 3019 | /* REFERENCED */ |
| 3020 | xfs_chash_t *ch; |
| 3021 | xfs_inode_t *iq; |
| 3022 | int clcount; /* count of inodes clustered */ |
| 3023 | int bufwasdelwri; |
| 3024 | enum { INT_DELWRI = (1 << 0), INT_ASYNC = (1 << 1) }; |
| 3025 | SPLDECL(s); |
| 3026 | |
| 3027 | XFS_STATS_INC(xs_iflush_count); |
| 3028 | |
| 3029 | ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE|MR_ACCESS)); |
Al Viro | 0d8fee3 | 2006-06-19 08:41:30 +1000 | [diff] [blame] | 3030 | ASSERT(issemalocked(&(ip->i_flock))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3031 | ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE || |
| 3032 | ip->i_d.di_nextents > ip->i_df.if_ext_max); |
| 3033 | |
| 3034 | iip = ip->i_itemp; |
| 3035 | mp = ip->i_mount; |
| 3036 | |
| 3037 | /* |
| 3038 | * If the inode isn't dirty, then just release the inode |
| 3039 | * flush lock and do nothing. |
| 3040 | */ |
| 3041 | if ((ip->i_update_core == 0) && |
| 3042 | ((iip == NULL) || !(iip->ili_format.ilf_fields & XFS_ILOG_ALL))) { |
| 3043 | ASSERT((iip != NULL) ? |
| 3044 | !(iip->ili_item.li_flags & XFS_LI_IN_AIL) : 1); |
| 3045 | xfs_ifunlock(ip); |
| 3046 | return 0; |
| 3047 | } |
| 3048 | |
| 3049 | /* |
| 3050 | * We can't flush the inode until it is unpinned, so |
| 3051 | * wait for it. We know noone new can pin it, because |
| 3052 | * we are holding the inode lock shared and you need |
| 3053 | * to hold it exclusively to pin the inode. |
| 3054 | */ |
| 3055 | xfs_iunpin_wait(ip); |
| 3056 | |
| 3057 | /* |
| 3058 | * This may have been unpinned because the filesystem is shutting |
| 3059 | * down forcibly. If that's the case we must not write this inode |
| 3060 | * to disk, because the log record didn't make it to disk! |
| 3061 | */ |
| 3062 | if (XFS_FORCED_SHUTDOWN(mp)) { |
| 3063 | ip->i_update_core = 0; |
| 3064 | if (iip) |
| 3065 | iip->ili_format.ilf_fields = 0; |
| 3066 | xfs_ifunlock(ip); |
| 3067 | return XFS_ERROR(EIO); |
| 3068 | } |
| 3069 | |
| 3070 | /* |
| 3071 | * Get the buffer containing the on-disk inode. |
| 3072 | */ |
Nathan Scott | b12dd34 | 2006-03-17 17:26:04 +1100 | [diff] [blame] | 3073 | error = xfs_itobp(mp, NULL, ip, &dip, &bp, 0, 0); |
| 3074 | if (error) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3075 | xfs_ifunlock(ip); |
| 3076 | return error; |
| 3077 | } |
| 3078 | |
| 3079 | /* |
| 3080 | * Decide how buffer will be flushed out. This is done before |
| 3081 | * the call to xfs_iflush_int because this field is zeroed by it. |
| 3082 | */ |
| 3083 | if (iip != NULL && iip->ili_format.ilf_fields != 0) { |
| 3084 | /* |
| 3085 | * Flush out the inode buffer according to the directions |
| 3086 | * of the caller. In the cases where the caller has given |
| 3087 | * us a choice choose the non-delwri case. This is because |
| 3088 | * the inode is in the AIL and we need to get it out soon. |
| 3089 | */ |
| 3090 | switch (flags) { |
| 3091 | case XFS_IFLUSH_SYNC: |
| 3092 | case XFS_IFLUSH_DELWRI_ELSE_SYNC: |
| 3093 | flags = 0; |
| 3094 | break; |
| 3095 | case XFS_IFLUSH_ASYNC: |
| 3096 | case XFS_IFLUSH_DELWRI_ELSE_ASYNC: |
| 3097 | flags = INT_ASYNC; |
| 3098 | break; |
| 3099 | case XFS_IFLUSH_DELWRI: |
| 3100 | flags = INT_DELWRI; |
| 3101 | break; |
| 3102 | default: |
| 3103 | ASSERT(0); |
| 3104 | flags = 0; |
| 3105 | break; |
| 3106 | } |
| 3107 | } else { |
| 3108 | switch (flags) { |
| 3109 | case XFS_IFLUSH_DELWRI_ELSE_SYNC: |
| 3110 | case XFS_IFLUSH_DELWRI_ELSE_ASYNC: |
| 3111 | case XFS_IFLUSH_DELWRI: |
| 3112 | flags = INT_DELWRI; |
| 3113 | break; |
| 3114 | case XFS_IFLUSH_ASYNC: |
| 3115 | flags = INT_ASYNC; |
| 3116 | break; |
| 3117 | case XFS_IFLUSH_SYNC: |
| 3118 | flags = 0; |
| 3119 | break; |
| 3120 | default: |
| 3121 | ASSERT(0); |
| 3122 | flags = 0; |
| 3123 | break; |
| 3124 | } |
| 3125 | } |
| 3126 | |
| 3127 | /* |
| 3128 | * First flush out the inode that xfs_iflush was called with. |
| 3129 | */ |
| 3130 | error = xfs_iflush_int(ip, bp); |
| 3131 | if (error) { |
| 3132 | goto corrupt_out; |
| 3133 | } |
| 3134 | |
| 3135 | /* |
| 3136 | * inode clustering: |
| 3137 | * see if other inodes can be gathered into this write |
| 3138 | */ |
| 3139 | |
| 3140 | ip->i_chash->chl_buf = bp; |
| 3141 | |
| 3142 | ch = XFS_CHASH(mp, ip->i_blkno); |
| 3143 | s = mutex_spinlock(&ch->ch_lock); |
| 3144 | |
| 3145 | clcount = 0; |
| 3146 | for (iq = ip->i_cnext; iq != ip; iq = iq->i_cnext) { |
| 3147 | /* |
| 3148 | * Do an un-protected check to see if the inode is dirty and |
| 3149 | * is a candidate for flushing. These checks will be repeated |
| 3150 | * later after the appropriate locks are acquired. |
| 3151 | */ |
| 3152 | iip = iq->i_itemp; |
| 3153 | if ((iq->i_update_core == 0) && |
| 3154 | ((iip == NULL) || |
| 3155 | !(iip->ili_format.ilf_fields & XFS_ILOG_ALL)) && |
| 3156 | xfs_ipincount(iq) == 0) { |
| 3157 | continue; |
| 3158 | } |
| 3159 | |
| 3160 | /* |
| 3161 | * Try to get locks. If any are unavailable, |
| 3162 | * then this inode cannot be flushed and is skipped. |
| 3163 | */ |
| 3164 | |
| 3165 | /* get inode locks (just i_lock) */ |
| 3166 | if (xfs_ilock_nowait(iq, XFS_ILOCK_SHARED)) { |
| 3167 | /* get inode flush lock */ |
| 3168 | if (xfs_iflock_nowait(iq)) { |
| 3169 | /* check if pinned */ |
| 3170 | if (xfs_ipincount(iq) == 0) { |
| 3171 | /* arriving here means that |
| 3172 | * this inode can be flushed. |
| 3173 | * first re-check that it's |
| 3174 | * dirty |
| 3175 | */ |
| 3176 | iip = iq->i_itemp; |
| 3177 | if ((iq->i_update_core != 0)|| |
| 3178 | ((iip != NULL) && |
| 3179 | (iip->ili_format.ilf_fields & XFS_ILOG_ALL))) { |
| 3180 | clcount++; |
| 3181 | error = xfs_iflush_int(iq, bp); |
| 3182 | if (error) { |
| 3183 | xfs_iunlock(iq, |
| 3184 | XFS_ILOCK_SHARED); |
| 3185 | goto cluster_corrupt_out; |
| 3186 | } |
| 3187 | } else { |
| 3188 | xfs_ifunlock(iq); |
| 3189 | } |
| 3190 | } else { |
| 3191 | xfs_ifunlock(iq); |
| 3192 | } |
| 3193 | } |
| 3194 | xfs_iunlock(iq, XFS_ILOCK_SHARED); |
| 3195 | } |
| 3196 | } |
| 3197 | mutex_spinunlock(&ch->ch_lock, s); |
| 3198 | |
| 3199 | if (clcount) { |
| 3200 | XFS_STATS_INC(xs_icluster_flushcnt); |
| 3201 | XFS_STATS_ADD(xs_icluster_flushinode, clcount); |
| 3202 | } |
| 3203 | |
| 3204 | /* |
| 3205 | * If the buffer is pinned then push on the log so we won't |
| 3206 | * get stuck waiting in the write for too long. |
| 3207 | */ |
| 3208 | if (XFS_BUF_ISPINNED(bp)){ |
| 3209 | xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE); |
| 3210 | } |
| 3211 | |
| 3212 | if (flags & INT_DELWRI) { |
| 3213 | xfs_bdwrite(mp, bp); |
| 3214 | } else if (flags & INT_ASYNC) { |
| 3215 | xfs_bawrite(mp, bp); |
| 3216 | } else { |
| 3217 | error = xfs_bwrite(mp, bp); |
| 3218 | } |
| 3219 | return error; |
| 3220 | |
| 3221 | corrupt_out: |
| 3222 | xfs_buf_relse(bp); |
Nathan Scott | 7d04a33 | 2006-06-09 14:58:38 +1000 | [diff] [blame] | 3223 | xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3224 | xfs_iflush_abort(ip); |
| 3225 | /* |
| 3226 | * Unlocks the flush lock |
| 3227 | */ |
| 3228 | return XFS_ERROR(EFSCORRUPTED); |
| 3229 | |
| 3230 | cluster_corrupt_out: |
| 3231 | /* Corruption detected in the clustering loop. Invalidate the |
| 3232 | * inode buffer and shut down the filesystem. |
| 3233 | */ |
| 3234 | mutex_spinunlock(&ch->ch_lock, s); |
| 3235 | |
| 3236 | /* |
| 3237 | * Clean up the buffer. If it was B_DELWRI, just release it -- |
| 3238 | * brelse can handle it with no problems. If not, shut down the |
| 3239 | * filesystem before releasing the buffer. |
| 3240 | */ |
| 3241 | if ((bufwasdelwri= XFS_BUF_ISDELAYWRITE(bp))) { |
| 3242 | xfs_buf_relse(bp); |
| 3243 | } |
| 3244 | |
Nathan Scott | 7d04a33 | 2006-06-09 14:58:38 +1000 | [diff] [blame] | 3245 | xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3246 | |
| 3247 | if(!bufwasdelwri) { |
| 3248 | /* |
| 3249 | * Just like incore_relse: if we have b_iodone functions, |
| 3250 | * mark the buffer as an error and call them. Otherwise |
| 3251 | * mark it as stale and brelse. |
| 3252 | */ |
| 3253 | if (XFS_BUF_IODONE_FUNC(bp)) { |
| 3254 | XFS_BUF_CLR_BDSTRAT_FUNC(bp); |
| 3255 | XFS_BUF_UNDONE(bp); |
| 3256 | XFS_BUF_STALE(bp); |
| 3257 | XFS_BUF_SHUT(bp); |
| 3258 | XFS_BUF_ERROR(bp,EIO); |
| 3259 | xfs_biodone(bp); |
| 3260 | } else { |
| 3261 | XFS_BUF_STALE(bp); |
| 3262 | xfs_buf_relse(bp); |
| 3263 | } |
| 3264 | } |
| 3265 | |
| 3266 | xfs_iflush_abort(iq); |
| 3267 | /* |
| 3268 | * Unlocks the flush lock |
| 3269 | */ |
| 3270 | return XFS_ERROR(EFSCORRUPTED); |
| 3271 | } |
| 3272 | |
| 3273 | |
| 3274 | STATIC int |
| 3275 | xfs_iflush_int( |
| 3276 | xfs_inode_t *ip, |
| 3277 | xfs_buf_t *bp) |
| 3278 | { |
| 3279 | xfs_inode_log_item_t *iip; |
| 3280 | xfs_dinode_t *dip; |
| 3281 | xfs_mount_t *mp; |
| 3282 | #ifdef XFS_TRANS_DEBUG |
| 3283 | int first; |
| 3284 | #endif |
| 3285 | SPLDECL(s); |
| 3286 | |
| 3287 | ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE|MR_ACCESS)); |
Al Viro | 0d8fee3 | 2006-06-19 08:41:30 +1000 | [diff] [blame] | 3288 | ASSERT(issemalocked(&(ip->i_flock))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3289 | ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE || |
| 3290 | ip->i_d.di_nextents > ip->i_df.if_ext_max); |
| 3291 | |
| 3292 | iip = ip->i_itemp; |
| 3293 | mp = ip->i_mount; |
| 3294 | |
| 3295 | |
| 3296 | /* |
| 3297 | * If the inode isn't dirty, then just release the inode |
| 3298 | * flush lock and do nothing. |
| 3299 | */ |
| 3300 | if ((ip->i_update_core == 0) && |
| 3301 | ((iip == NULL) || !(iip->ili_format.ilf_fields & XFS_ILOG_ALL))) { |
| 3302 | xfs_ifunlock(ip); |
| 3303 | return 0; |
| 3304 | } |
| 3305 | |
| 3306 | /* set *dip = inode's place in the buffer */ |
| 3307 | dip = (xfs_dinode_t *)xfs_buf_offset(bp, ip->i_boffset); |
| 3308 | |
| 3309 | /* |
| 3310 | * Clear i_update_core before copying out the data. |
| 3311 | * This is for coordination with our timestamp updates |
| 3312 | * that don't hold the inode lock. They will always |
| 3313 | * update the timestamps BEFORE setting i_update_core, |
| 3314 | * so if we clear i_update_core after they set it we |
| 3315 | * are guaranteed to see their updates to the timestamps. |
| 3316 | * I believe that this depends on strongly ordered memory |
| 3317 | * semantics, but we have that. We use the SYNCHRONIZE |
| 3318 | * macro to make sure that the compiler does not reorder |
| 3319 | * the i_update_core access below the data copy below. |
| 3320 | */ |
| 3321 | ip->i_update_core = 0; |
| 3322 | SYNCHRONIZE(); |
| 3323 | |
Christoph Hellwig | 42fe2b1 | 2006-01-11 15:35:17 +1100 | [diff] [blame] | 3324 | /* |
| 3325 | * Make sure to get the latest atime from the Linux inode. |
| 3326 | */ |
| 3327 | xfs_synchronize_atime(ip); |
| 3328 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3329 | if (XFS_TEST_ERROR(INT_GET(dip->di_core.di_magic,ARCH_CONVERT) != XFS_DINODE_MAGIC, |
| 3330 | mp, XFS_ERRTAG_IFLUSH_1, XFS_RANDOM_IFLUSH_1)) { |
| 3331 | xfs_cmn_err(XFS_PTAG_IFLUSH, CE_ALERT, mp, |
| 3332 | "xfs_iflush: Bad inode %Lu magic number 0x%x, ptr 0x%p", |
| 3333 | ip->i_ino, (int) INT_GET(dip->di_core.di_magic, ARCH_CONVERT), dip); |
| 3334 | goto corrupt_out; |
| 3335 | } |
| 3336 | if (XFS_TEST_ERROR(ip->i_d.di_magic != XFS_DINODE_MAGIC, |
| 3337 | mp, XFS_ERRTAG_IFLUSH_2, XFS_RANDOM_IFLUSH_2)) { |
| 3338 | xfs_cmn_err(XFS_PTAG_IFLUSH, CE_ALERT, mp, |
| 3339 | "xfs_iflush: Bad inode %Lu, ptr 0x%p, magic number 0x%x", |
| 3340 | ip->i_ino, ip, ip->i_d.di_magic); |
| 3341 | goto corrupt_out; |
| 3342 | } |
| 3343 | if ((ip->i_d.di_mode & S_IFMT) == S_IFREG) { |
| 3344 | if (XFS_TEST_ERROR( |
| 3345 | (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) && |
| 3346 | (ip->i_d.di_format != XFS_DINODE_FMT_BTREE), |
| 3347 | mp, XFS_ERRTAG_IFLUSH_3, XFS_RANDOM_IFLUSH_3)) { |
| 3348 | xfs_cmn_err(XFS_PTAG_IFLUSH, CE_ALERT, mp, |
| 3349 | "xfs_iflush: Bad regular inode %Lu, ptr 0x%p", |
| 3350 | ip->i_ino, ip); |
| 3351 | goto corrupt_out; |
| 3352 | } |
| 3353 | } else if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) { |
| 3354 | if (XFS_TEST_ERROR( |
| 3355 | (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) && |
| 3356 | (ip->i_d.di_format != XFS_DINODE_FMT_BTREE) && |
| 3357 | (ip->i_d.di_format != XFS_DINODE_FMT_LOCAL), |
| 3358 | mp, XFS_ERRTAG_IFLUSH_4, XFS_RANDOM_IFLUSH_4)) { |
| 3359 | xfs_cmn_err(XFS_PTAG_IFLUSH, CE_ALERT, mp, |
| 3360 | "xfs_iflush: Bad directory inode %Lu, ptr 0x%p", |
| 3361 | ip->i_ino, ip); |
| 3362 | goto corrupt_out; |
| 3363 | } |
| 3364 | } |
| 3365 | if (XFS_TEST_ERROR(ip->i_d.di_nextents + ip->i_d.di_anextents > |
| 3366 | ip->i_d.di_nblocks, mp, XFS_ERRTAG_IFLUSH_5, |
| 3367 | XFS_RANDOM_IFLUSH_5)) { |
| 3368 | xfs_cmn_err(XFS_PTAG_IFLUSH, CE_ALERT, mp, |
| 3369 | "xfs_iflush: detected corrupt incore inode %Lu, total extents = %d, nblocks = %Ld, ptr 0x%p", |
| 3370 | ip->i_ino, |
| 3371 | ip->i_d.di_nextents + ip->i_d.di_anextents, |
| 3372 | ip->i_d.di_nblocks, |
| 3373 | ip); |
| 3374 | goto corrupt_out; |
| 3375 | } |
| 3376 | if (XFS_TEST_ERROR(ip->i_d.di_forkoff > mp->m_sb.sb_inodesize, |
| 3377 | mp, XFS_ERRTAG_IFLUSH_6, XFS_RANDOM_IFLUSH_6)) { |
| 3378 | xfs_cmn_err(XFS_PTAG_IFLUSH, CE_ALERT, mp, |
| 3379 | "xfs_iflush: bad inode %Lu, forkoff 0x%x, ptr 0x%p", |
| 3380 | ip->i_ino, ip->i_d.di_forkoff, ip); |
| 3381 | goto corrupt_out; |
| 3382 | } |
| 3383 | /* |
| 3384 | * bump the flush iteration count, used to detect flushes which |
| 3385 | * postdate a log record during recovery. |
| 3386 | */ |
| 3387 | |
| 3388 | ip->i_d.di_flushiter++; |
| 3389 | |
| 3390 | /* |
| 3391 | * Copy the dirty parts of the inode into the on-disk |
| 3392 | * inode. We always copy out the core of the inode, |
| 3393 | * because if the inode is dirty at all the core must |
| 3394 | * be. |
| 3395 | */ |
| 3396 | xfs_xlate_dinode_core((xfs_caddr_t)&(dip->di_core), &(ip->i_d), -1); |
| 3397 | |
| 3398 | /* Wrap, we never let the log put out DI_MAX_FLUSH */ |
| 3399 | if (ip->i_d.di_flushiter == DI_MAX_FLUSH) |
| 3400 | ip->i_d.di_flushiter = 0; |
| 3401 | |
| 3402 | /* |
| 3403 | * If this is really an old format inode and the superblock version |
| 3404 | * has not been updated to support only new format inodes, then |
| 3405 | * convert back to the old inode format. If the superblock version |
| 3406 | * has been updated, then make the conversion permanent. |
| 3407 | */ |
| 3408 | ASSERT(ip->i_d.di_version == XFS_DINODE_VERSION_1 || |
| 3409 | XFS_SB_VERSION_HASNLINK(&mp->m_sb)); |
| 3410 | if (ip->i_d.di_version == XFS_DINODE_VERSION_1) { |
| 3411 | if (!XFS_SB_VERSION_HASNLINK(&mp->m_sb)) { |
| 3412 | /* |
| 3413 | * Convert it back. |
| 3414 | */ |
| 3415 | ASSERT(ip->i_d.di_nlink <= XFS_MAXLINK_1); |
| 3416 | INT_SET(dip->di_core.di_onlink, ARCH_CONVERT, ip->i_d.di_nlink); |
| 3417 | } else { |
| 3418 | /* |
| 3419 | * The superblock version has already been bumped, |
| 3420 | * so just make the conversion to the new inode |
| 3421 | * format permanent. |
| 3422 | */ |
| 3423 | ip->i_d.di_version = XFS_DINODE_VERSION_2; |
| 3424 | INT_SET(dip->di_core.di_version, ARCH_CONVERT, XFS_DINODE_VERSION_2); |
| 3425 | ip->i_d.di_onlink = 0; |
| 3426 | dip->di_core.di_onlink = 0; |
| 3427 | memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad)); |
| 3428 | memset(&(dip->di_core.di_pad[0]), 0, |
| 3429 | sizeof(dip->di_core.di_pad)); |
| 3430 | ASSERT(ip->i_d.di_projid == 0); |
| 3431 | } |
| 3432 | } |
| 3433 | |
| 3434 | if (xfs_iflush_fork(ip, dip, iip, XFS_DATA_FORK, bp) == EFSCORRUPTED) { |
| 3435 | goto corrupt_out; |
| 3436 | } |
| 3437 | |
| 3438 | if (XFS_IFORK_Q(ip)) { |
| 3439 | /* |
| 3440 | * The only error from xfs_iflush_fork is on the data fork. |
| 3441 | */ |
| 3442 | (void) xfs_iflush_fork(ip, dip, iip, XFS_ATTR_FORK, bp); |
| 3443 | } |
| 3444 | xfs_inobp_check(mp, bp); |
| 3445 | |
| 3446 | /* |
| 3447 | * We've recorded everything logged in the inode, so we'd |
| 3448 | * like to clear the ilf_fields bits so we don't log and |
| 3449 | * flush things unnecessarily. However, we can't stop |
| 3450 | * logging all this information until the data we've copied |
| 3451 | * into the disk buffer is written to disk. If we did we might |
| 3452 | * overwrite the copy of the inode in the log with all the |
| 3453 | * data after re-logging only part of it, and in the face of |
| 3454 | * a crash we wouldn't have all the data we need to recover. |
| 3455 | * |
| 3456 | * What we do is move the bits to the ili_last_fields field. |
| 3457 | * When logging the inode, these bits are moved back to the |
| 3458 | * ilf_fields field. In the xfs_iflush_done() routine we |
| 3459 | * clear ili_last_fields, since we know that the information |
| 3460 | * those bits represent is permanently on disk. As long as |
| 3461 | * the flush completes before the inode is logged again, then |
| 3462 | * both ilf_fields and ili_last_fields will be cleared. |
| 3463 | * |
| 3464 | * We can play with the ilf_fields bits here, because the inode |
| 3465 | * lock must be held exclusively in order to set bits there |
| 3466 | * and the flush lock protects the ili_last_fields bits. |
| 3467 | * Set ili_logged so the flush done |
| 3468 | * routine can tell whether or not to look in the AIL. |
| 3469 | * Also, store the current LSN of the inode so that we can tell |
| 3470 | * whether the item has moved in the AIL from xfs_iflush_done(). |
| 3471 | * In order to read the lsn we need the AIL lock, because |
| 3472 | * it is a 64 bit value that cannot be read atomically. |
| 3473 | */ |
| 3474 | if (iip != NULL && iip->ili_format.ilf_fields != 0) { |
| 3475 | iip->ili_last_fields = iip->ili_format.ilf_fields; |
| 3476 | iip->ili_format.ilf_fields = 0; |
| 3477 | iip->ili_logged = 1; |
| 3478 | |
| 3479 | ASSERT(sizeof(xfs_lsn_t) == 8); /* don't lock if it shrinks */ |
| 3480 | AIL_LOCK(mp,s); |
| 3481 | iip->ili_flush_lsn = iip->ili_item.li_lsn; |
| 3482 | AIL_UNLOCK(mp, s); |
| 3483 | |
| 3484 | /* |
| 3485 | * Attach the function xfs_iflush_done to the inode's |
| 3486 | * buffer. This will remove the inode from the AIL |
| 3487 | * and unlock the inode's flush lock when the inode is |
| 3488 | * completely written to disk. |
| 3489 | */ |
| 3490 | xfs_buf_attach_iodone(bp, (void(*)(xfs_buf_t*,xfs_log_item_t*)) |
| 3491 | xfs_iflush_done, (xfs_log_item_t *)iip); |
| 3492 | |
| 3493 | ASSERT(XFS_BUF_FSPRIVATE(bp, void *) != NULL); |
| 3494 | ASSERT(XFS_BUF_IODONE_FUNC(bp) != NULL); |
| 3495 | } else { |
| 3496 | /* |
| 3497 | * We're flushing an inode which is not in the AIL and has |
| 3498 | * not been logged but has i_update_core set. For this |
| 3499 | * case we can use a B_DELWRI flush and immediately drop |
| 3500 | * the inode flush lock because we can avoid the whole |
| 3501 | * AIL state thing. It's OK to drop the flush lock now, |
| 3502 | * because we've already locked the buffer and to do anything |
| 3503 | * you really need both. |
| 3504 | */ |
| 3505 | if (iip != NULL) { |
| 3506 | ASSERT(iip->ili_logged == 0); |
| 3507 | ASSERT(iip->ili_last_fields == 0); |
| 3508 | ASSERT((iip->ili_item.li_flags & XFS_LI_IN_AIL) == 0); |
| 3509 | } |
| 3510 | xfs_ifunlock(ip); |
| 3511 | } |
| 3512 | |
| 3513 | return 0; |
| 3514 | |
| 3515 | corrupt_out: |
| 3516 | return XFS_ERROR(EFSCORRUPTED); |
| 3517 | } |
| 3518 | |
| 3519 | |
| 3520 | /* |
Christoph Hellwig | efa8027 | 2005-06-21 15:37:17 +1000 | [diff] [blame] | 3521 | * Flush all inactive inodes in mp. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3522 | */ |
Christoph Hellwig | efa8027 | 2005-06-21 15:37:17 +1000 | [diff] [blame] | 3523 | void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3524 | xfs_iflush_all( |
Christoph Hellwig | efa8027 | 2005-06-21 15:37:17 +1000 | [diff] [blame] | 3525 | xfs_mount_t *mp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3526 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3527 | xfs_inode_t *ip; |
Nathan Scott | 67fcaa7 | 2006-06-09 17:00:52 +1000 | [diff] [blame] | 3528 | bhv_vnode_t *vp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3529 | |
Christoph Hellwig | efa8027 | 2005-06-21 15:37:17 +1000 | [diff] [blame] | 3530 | again: |
| 3531 | XFS_MOUNT_ILOCK(mp); |
| 3532 | ip = mp->m_inodes; |
| 3533 | if (ip == NULL) |
| 3534 | goto out; |
| 3535 | |
| 3536 | do { |
| 3537 | /* Make sure we skip markers inserted by sync */ |
| 3538 | if (ip->i_mount == NULL) { |
| 3539 | ip = ip->i_mnext; |
| 3540 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3541 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3542 | |
Christoph Hellwig | efa8027 | 2005-06-21 15:37:17 +1000 | [diff] [blame] | 3543 | vp = XFS_ITOV_NULL(ip); |
| 3544 | if (!vp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3545 | XFS_MOUNT_IUNLOCK(mp); |
Christoph Hellwig | efa8027 | 2005-06-21 15:37:17 +1000 | [diff] [blame] | 3546 | xfs_finish_reclaim(ip, 0, XFS_IFLUSH_ASYNC); |
| 3547 | goto again; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3548 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3549 | |
Christoph Hellwig | efa8027 | 2005-06-21 15:37:17 +1000 | [diff] [blame] | 3550 | ASSERT(vn_count(vp) == 0); |
| 3551 | |
| 3552 | ip = ip->i_mnext; |
| 3553 | } while (ip != mp->m_inodes); |
| 3554 | out: |
| 3555 | XFS_MOUNT_IUNLOCK(mp); |
| 3556 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3557 | |
| 3558 | /* |
| 3559 | * xfs_iaccess: check accessibility of inode for mode. |
| 3560 | */ |
| 3561 | int |
| 3562 | xfs_iaccess( |
| 3563 | xfs_inode_t *ip, |
| 3564 | mode_t mode, |
| 3565 | cred_t *cr) |
| 3566 | { |
| 3567 | int error; |
| 3568 | mode_t orgmode = mode; |
Nathan Scott | ec86dc0 | 2006-03-17 17:25:36 +1100 | [diff] [blame] | 3569 | struct inode *inode = vn_to_inode(XFS_ITOV(ip)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3570 | |
| 3571 | if (mode & S_IWUSR) { |
| 3572 | umode_t imode = inode->i_mode; |
| 3573 | |
| 3574 | if (IS_RDONLY(inode) && |
| 3575 | (S_ISREG(imode) || S_ISDIR(imode) || S_ISLNK(imode))) |
| 3576 | return XFS_ERROR(EROFS); |
| 3577 | |
| 3578 | if (IS_IMMUTABLE(inode)) |
| 3579 | return XFS_ERROR(EACCES); |
| 3580 | } |
| 3581 | |
| 3582 | /* |
| 3583 | * If there's an Access Control List it's used instead of |
| 3584 | * the mode bits. |
| 3585 | */ |
| 3586 | if ((error = _ACL_XFS_IACCESS(ip, mode, cr)) != -1) |
| 3587 | return error ? XFS_ERROR(error) : 0; |
| 3588 | |
| 3589 | if (current_fsuid(cr) != ip->i_d.di_uid) { |
| 3590 | mode >>= 3; |
| 3591 | if (!in_group_p((gid_t)ip->i_d.di_gid)) |
| 3592 | mode >>= 3; |
| 3593 | } |
| 3594 | |
| 3595 | /* |
| 3596 | * If the DACs are ok we don't need any capability check. |
| 3597 | */ |
| 3598 | if ((ip->i_d.di_mode & mode) == mode) |
| 3599 | return 0; |
| 3600 | /* |
| 3601 | * Read/write DACs are always overridable. |
| 3602 | * Executable DACs are overridable if at least one exec bit is set. |
| 3603 | */ |
| 3604 | if (!(orgmode & S_IXUSR) || |
| 3605 | (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode)) |
| 3606 | if (capable_cred(cr, CAP_DAC_OVERRIDE)) |
| 3607 | return 0; |
| 3608 | |
| 3609 | if ((orgmode == S_IRUSR) || |
| 3610 | (S_ISDIR(inode->i_mode) && (!(orgmode & S_IWUSR)))) { |
| 3611 | if (capable_cred(cr, CAP_DAC_READ_SEARCH)) |
| 3612 | return 0; |
| 3613 | #ifdef NOISE |
| 3614 | cmn_err(CE_NOTE, "Ick: mode=%o, orgmode=%o", mode, orgmode); |
| 3615 | #endif /* NOISE */ |
| 3616 | return XFS_ERROR(EACCES); |
| 3617 | } |
| 3618 | return XFS_ERROR(EACCES); |
| 3619 | } |
| 3620 | |
| 3621 | /* |
| 3622 | * xfs_iroundup: round up argument to next power of two |
| 3623 | */ |
| 3624 | uint |
| 3625 | xfs_iroundup( |
| 3626 | uint v) |
| 3627 | { |
| 3628 | int i; |
| 3629 | uint m; |
| 3630 | |
| 3631 | if ((v & (v - 1)) == 0) |
| 3632 | return v; |
| 3633 | ASSERT((v & 0x80000000) == 0); |
| 3634 | if ((v & (v + 1)) == 0) |
| 3635 | return v + 1; |
| 3636 | for (i = 0, m = 1; i < 31; i++, m <<= 1) { |
| 3637 | if (v & m) |
| 3638 | continue; |
| 3639 | v |= m; |
| 3640 | if ((v & (v + 1)) == 0) |
| 3641 | return v + 1; |
| 3642 | } |
| 3643 | ASSERT(0); |
| 3644 | return( 0 ); |
| 3645 | } |
| 3646 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3647 | #ifdef XFS_ILOCK_TRACE |
| 3648 | ktrace_t *xfs_ilock_trace_buf; |
| 3649 | |
| 3650 | void |
| 3651 | xfs_ilock_trace(xfs_inode_t *ip, int lock, unsigned int lockflags, inst_t *ra) |
| 3652 | { |
| 3653 | ktrace_enter(ip->i_lock_trace, |
| 3654 | (void *)ip, |
| 3655 | (void *)(unsigned long)lock, /* 1 = LOCK, 3=UNLOCK, etc */ |
| 3656 | (void *)(unsigned long)lockflags, /* XFS_ILOCK_EXCL etc */ |
| 3657 | (void *)ra, /* caller of ilock */ |
| 3658 | (void *)(unsigned long)current_cpu(), |
| 3659 | (void *)(unsigned long)current_pid(), |
| 3660 | NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL); |
| 3661 | } |
| 3662 | #endif |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 3663 | |
| 3664 | /* |
| 3665 | * Return a pointer to the extent record at file index idx. |
| 3666 | */ |
| 3667 | xfs_bmbt_rec_t * |
| 3668 | xfs_iext_get_ext( |
| 3669 | xfs_ifork_t *ifp, /* inode fork pointer */ |
| 3670 | xfs_extnum_t idx) /* index of target extent */ |
| 3671 | { |
| 3672 | ASSERT(idx >= 0); |
Mandy Kirkconnell | 0293ce3 | 2006-03-14 13:30:23 +1100 | [diff] [blame] | 3673 | if ((ifp->if_flags & XFS_IFEXTIREC) && (idx == 0)) { |
| 3674 | return ifp->if_u1.if_ext_irec->er_extbuf; |
| 3675 | } else if (ifp->if_flags & XFS_IFEXTIREC) { |
| 3676 | xfs_ext_irec_t *erp; /* irec pointer */ |
| 3677 | int erp_idx = 0; /* irec index */ |
| 3678 | xfs_extnum_t page_idx = idx; /* ext index in target list */ |
| 3679 | |
| 3680 | erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 0); |
| 3681 | return &erp->er_extbuf[page_idx]; |
| 3682 | } else if (ifp->if_bytes) { |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 3683 | return &ifp->if_u1.if_extents[idx]; |
| 3684 | } else { |
| 3685 | return NULL; |
| 3686 | } |
| 3687 | } |
| 3688 | |
| 3689 | /* |
| 3690 | * Insert new item(s) into the extent records for incore inode |
| 3691 | * fork 'ifp'. 'count' new items are inserted at index 'idx'. |
| 3692 | */ |
| 3693 | void |
| 3694 | xfs_iext_insert( |
| 3695 | xfs_ifork_t *ifp, /* inode fork pointer */ |
| 3696 | xfs_extnum_t idx, /* starting index of new items */ |
| 3697 | xfs_extnum_t count, /* number of inserted items */ |
| 3698 | xfs_bmbt_irec_t *new) /* items to insert */ |
| 3699 | { |
| 3700 | xfs_bmbt_rec_t *ep; /* extent record pointer */ |
| 3701 | xfs_extnum_t i; /* extent record index */ |
| 3702 | |
| 3703 | ASSERT(ifp->if_flags & XFS_IFEXTENTS); |
| 3704 | xfs_iext_add(ifp, idx, count); |
| 3705 | for (i = idx; i < idx + count; i++, new++) { |
| 3706 | ep = xfs_iext_get_ext(ifp, i); |
| 3707 | xfs_bmbt_set_all(ep, new); |
| 3708 | } |
| 3709 | } |
| 3710 | |
| 3711 | /* |
| 3712 | * This is called when the amount of space required for incore file |
| 3713 | * extents needs to be increased. The ext_diff parameter stores the |
| 3714 | * number of new extents being added and the idx parameter contains |
| 3715 | * the extent index where the new extents will be added. If the new |
| 3716 | * extents are being appended, then we just need to (re)allocate and |
| 3717 | * initialize the space. Otherwise, if the new extents are being |
| 3718 | * inserted into the middle of the existing entries, a bit more work |
| 3719 | * is required to make room for the new extents to be inserted. The |
| 3720 | * caller is responsible for filling in the new extent entries upon |
| 3721 | * return. |
| 3722 | */ |
| 3723 | void |
| 3724 | xfs_iext_add( |
| 3725 | xfs_ifork_t *ifp, /* inode fork pointer */ |
| 3726 | xfs_extnum_t idx, /* index to begin adding exts */ |
Nathan Scott | c41564b | 2006-03-29 08:55:14 +1000 | [diff] [blame] | 3727 | int ext_diff) /* number of extents to add */ |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 3728 | { |
| 3729 | int byte_diff; /* new bytes being added */ |
| 3730 | int new_size; /* size of extents after adding */ |
| 3731 | xfs_extnum_t nextents; /* number of extents in file */ |
| 3732 | |
| 3733 | nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); |
| 3734 | ASSERT((idx >= 0) && (idx <= nextents)); |
| 3735 | byte_diff = ext_diff * sizeof(xfs_bmbt_rec_t); |
| 3736 | new_size = ifp->if_bytes + byte_diff; |
| 3737 | /* |
| 3738 | * If the new number of extents (nextents + ext_diff) |
| 3739 | * fits inside the inode, then continue to use the inline |
| 3740 | * extent buffer. |
| 3741 | */ |
| 3742 | if (nextents + ext_diff <= XFS_INLINE_EXTS) { |
| 3743 | if (idx < nextents) { |
| 3744 | memmove(&ifp->if_u2.if_inline_ext[idx + ext_diff], |
| 3745 | &ifp->if_u2.if_inline_ext[idx], |
| 3746 | (nextents - idx) * sizeof(xfs_bmbt_rec_t)); |
| 3747 | memset(&ifp->if_u2.if_inline_ext[idx], 0, byte_diff); |
| 3748 | } |
| 3749 | ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext; |
| 3750 | ifp->if_real_bytes = 0; |
Mandy Kirkconnell | 0293ce3 | 2006-03-14 13:30:23 +1100 | [diff] [blame] | 3751 | ifp->if_lastex = nextents + ext_diff; |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 3752 | } |
| 3753 | /* |
| 3754 | * Otherwise use a linear (direct) extent list. |
| 3755 | * If the extents are currently inside the inode, |
| 3756 | * xfs_iext_realloc_direct will switch us from |
| 3757 | * inline to direct extent allocation mode. |
| 3758 | */ |
Mandy Kirkconnell | 0293ce3 | 2006-03-14 13:30:23 +1100 | [diff] [blame] | 3759 | else if (nextents + ext_diff <= XFS_LINEAR_EXTS) { |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 3760 | xfs_iext_realloc_direct(ifp, new_size); |
| 3761 | if (idx < nextents) { |
| 3762 | memmove(&ifp->if_u1.if_extents[idx + ext_diff], |
| 3763 | &ifp->if_u1.if_extents[idx], |
| 3764 | (nextents - idx) * sizeof(xfs_bmbt_rec_t)); |
| 3765 | memset(&ifp->if_u1.if_extents[idx], 0, byte_diff); |
| 3766 | } |
| 3767 | } |
Mandy Kirkconnell | 0293ce3 | 2006-03-14 13:30:23 +1100 | [diff] [blame] | 3768 | /* Indirection array */ |
| 3769 | else { |
| 3770 | xfs_ext_irec_t *erp; |
| 3771 | int erp_idx = 0; |
| 3772 | int page_idx = idx; |
| 3773 | |
| 3774 | ASSERT(nextents + ext_diff > XFS_LINEAR_EXTS); |
| 3775 | if (ifp->if_flags & XFS_IFEXTIREC) { |
| 3776 | erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 1); |
| 3777 | } else { |
| 3778 | xfs_iext_irec_init(ifp); |
| 3779 | ASSERT(ifp->if_flags & XFS_IFEXTIREC); |
| 3780 | erp = ifp->if_u1.if_ext_irec; |
| 3781 | } |
| 3782 | /* Extents fit in target extent page */ |
| 3783 | if (erp && erp->er_extcount + ext_diff <= XFS_LINEAR_EXTS) { |
| 3784 | if (page_idx < erp->er_extcount) { |
| 3785 | memmove(&erp->er_extbuf[page_idx + ext_diff], |
| 3786 | &erp->er_extbuf[page_idx], |
| 3787 | (erp->er_extcount - page_idx) * |
| 3788 | sizeof(xfs_bmbt_rec_t)); |
| 3789 | memset(&erp->er_extbuf[page_idx], 0, byte_diff); |
| 3790 | } |
| 3791 | erp->er_extcount += ext_diff; |
| 3792 | xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff); |
| 3793 | } |
| 3794 | /* Insert a new extent page */ |
| 3795 | else if (erp) { |
| 3796 | xfs_iext_add_indirect_multi(ifp, |
| 3797 | erp_idx, page_idx, ext_diff); |
| 3798 | } |
| 3799 | /* |
| 3800 | * If extent(s) are being appended to the last page in |
| 3801 | * the indirection array and the new extent(s) don't fit |
| 3802 | * in the page, then erp is NULL and erp_idx is set to |
| 3803 | * the next index needed in the indirection array. |
| 3804 | */ |
| 3805 | else { |
| 3806 | int count = ext_diff; |
| 3807 | |
| 3808 | while (count) { |
| 3809 | erp = xfs_iext_irec_new(ifp, erp_idx); |
| 3810 | erp->er_extcount = count; |
| 3811 | count -= MIN(count, (int)XFS_LINEAR_EXTS); |
| 3812 | if (count) { |
| 3813 | erp_idx++; |
| 3814 | } |
| 3815 | } |
| 3816 | } |
| 3817 | } |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 3818 | ifp->if_bytes = new_size; |
| 3819 | } |
| 3820 | |
| 3821 | /* |
Mandy Kirkconnell | 0293ce3 | 2006-03-14 13:30:23 +1100 | [diff] [blame] | 3822 | * This is called when incore extents are being added to the indirection |
| 3823 | * array and the new extents do not fit in the target extent list. The |
| 3824 | * erp_idx parameter contains the irec index for the target extent list |
| 3825 | * in the indirection array, and the idx parameter contains the extent |
| 3826 | * index within the list. The number of extents being added is stored |
| 3827 | * in the count parameter. |
| 3828 | * |
| 3829 | * |-------| |-------| |
| 3830 | * | | | | idx - number of extents before idx |
| 3831 | * | idx | | count | |
| 3832 | * | | | | count - number of extents being inserted at idx |
| 3833 | * |-------| |-------| |
| 3834 | * | count | | nex2 | nex2 - number of extents after idx + count |
| 3835 | * |-------| |-------| |
| 3836 | */ |
| 3837 | void |
| 3838 | xfs_iext_add_indirect_multi( |
| 3839 | xfs_ifork_t *ifp, /* inode fork pointer */ |
| 3840 | int erp_idx, /* target extent irec index */ |
| 3841 | xfs_extnum_t idx, /* index within target list */ |
| 3842 | int count) /* new extents being added */ |
| 3843 | { |
| 3844 | int byte_diff; /* new bytes being added */ |
| 3845 | xfs_ext_irec_t *erp; /* pointer to irec entry */ |
| 3846 | xfs_extnum_t ext_diff; /* number of extents to add */ |
| 3847 | xfs_extnum_t ext_cnt; /* new extents still needed */ |
| 3848 | xfs_extnum_t nex2; /* extents after idx + count */ |
| 3849 | xfs_bmbt_rec_t *nex2_ep = NULL; /* temp list for nex2 extents */ |
| 3850 | int nlists; /* number of irec's (lists) */ |
| 3851 | |
| 3852 | ASSERT(ifp->if_flags & XFS_IFEXTIREC); |
| 3853 | erp = &ifp->if_u1.if_ext_irec[erp_idx]; |
| 3854 | nex2 = erp->er_extcount - idx; |
| 3855 | nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; |
| 3856 | |
| 3857 | /* |
| 3858 | * Save second part of target extent list |
| 3859 | * (all extents past */ |
| 3860 | if (nex2) { |
| 3861 | byte_diff = nex2 * sizeof(xfs_bmbt_rec_t); |
| 3862 | nex2_ep = (xfs_bmbt_rec_t *) kmem_alloc(byte_diff, KM_SLEEP); |
| 3863 | memmove(nex2_ep, &erp->er_extbuf[idx], byte_diff); |
| 3864 | erp->er_extcount -= nex2; |
| 3865 | xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, -nex2); |
| 3866 | memset(&erp->er_extbuf[idx], 0, byte_diff); |
| 3867 | } |
| 3868 | |
| 3869 | /* |
| 3870 | * Add the new extents to the end of the target |
| 3871 | * list, then allocate new irec record(s) and |
| 3872 | * extent buffer(s) as needed to store the rest |
| 3873 | * of the new extents. |
| 3874 | */ |
| 3875 | ext_cnt = count; |
| 3876 | ext_diff = MIN(ext_cnt, (int)XFS_LINEAR_EXTS - erp->er_extcount); |
| 3877 | if (ext_diff) { |
| 3878 | erp->er_extcount += ext_diff; |
| 3879 | xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff); |
| 3880 | ext_cnt -= ext_diff; |
| 3881 | } |
| 3882 | while (ext_cnt) { |
| 3883 | erp_idx++; |
| 3884 | erp = xfs_iext_irec_new(ifp, erp_idx); |
| 3885 | ext_diff = MIN(ext_cnt, (int)XFS_LINEAR_EXTS); |
| 3886 | erp->er_extcount = ext_diff; |
| 3887 | xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff); |
| 3888 | ext_cnt -= ext_diff; |
| 3889 | } |
| 3890 | |
| 3891 | /* Add nex2 extents back to indirection array */ |
| 3892 | if (nex2) { |
| 3893 | xfs_extnum_t ext_avail; |
| 3894 | int i; |
| 3895 | |
| 3896 | byte_diff = nex2 * sizeof(xfs_bmbt_rec_t); |
| 3897 | ext_avail = XFS_LINEAR_EXTS - erp->er_extcount; |
| 3898 | i = 0; |
| 3899 | /* |
| 3900 | * If nex2 extents fit in the current page, append |
| 3901 | * nex2_ep after the new extents. |
| 3902 | */ |
| 3903 | if (nex2 <= ext_avail) { |
| 3904 | i = erp->er_extcount; |
| 3905 | } |
| 3906 | /* |
| 3907 | * Otherwise, check if space is available in the |
| 3908 | * next page. |
| 3909 | */ |
| 3910 | else if ((erp_idx < nlists - 1) && |
| 3911 | (nex2 <= (ext_avail = XFS_LINEAR_EXTS - |
| 3912 | ifp->if_u1.if_ext_irec[erp_idx+1].er_extcount))) { |
| 3913 | erp_idx++; |
| 3914 | erp++; |
| 3915 | /* Create a hole for nex2 extents */ |
| 3916 | memmove(&erp->er_extbuf[nex2], erp->er_extbuf, |
| 3917 | erp->er_extcount * sizeof(xfs_bmbt_rec_t)); |
| 3918 | } |
| 3919 | /* |
| 3920 | * Final choice, create a new extent page for |
| 3921 | * nex2 extents. |
| 3922 | */ |
| 3923 | else { |
| 3924 | erp_idx++; |
| 3925 | erp = xfs_iext_irec_new(ifp, erp_idx); |
| 3926 | } |
| 3927 | memmove(&erp->er_extbuf[i], nex2_ep, byte_diff); |
| 3928 | kmem_free(nex2_ep, byte_diff); |
| 3929 | erp->er_extcount += nex2; |
| 3930 | xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, nex2); |
| 3931 | } |
| 3932 | } |
| 3933 | |
| 3934 | /* |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 3935 | * This is called when the amount of space required for incore file |
| 3936 | * extents needs to be decreased. The ext_diff parameter stores the |
| 3937 | * number of extents to be removed and the idx parameter contains |
| 3938 | * the extent index where the extents will be removed from. |
Mandy Kirkconnell | 0293ce3 | 2006-03-14 13:30:23 +1100 | [diff] [blame] | 3939 | * |
| 3940 | * If the amount of space needed has decreased below the linear |
| 3941 | * limit, XFS_IEXT_BUFSZ, then switch to using the contiguous |
| 3942 | * extent array. Otherwise, use kmem_realloc() to adjust the |
| 3943 | * size to what is needed. |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 3944 | */ |
| 3945 | void |
| 3946 | xfs_iext_remove( |
| 3947 | xfs_ifork_t *ifp, /* inode fork pointer */ |
| 3948 | xfs_extnum_t idx, /* index to begin removing exts */ |
| 3949 | int ext_diff) /* number of extents to remove */ |
| 3950 | { |
| 3951 | xfs_extnum_t nextents; /* number of extents in file */ |
| 3952 | int new_size; /* size of extents after removal */ |
| 3953 | |
| 3954 | ASSERT(ext_diff > 0); |
| 3955 | nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); |
| 3956 | new_size = (nextents - ext_diff) * sizeof(xfs_bmbt_rec_t); |
| 3957 | |
| 3958 | if (new_size == 0) { |
| 3959 | xfs_iext_destroy(ifp); |
Mandy Kirkconnell | 0293ce3 | 2006-03-14 13:30:23 +1100 | [diff] [blame] | 3960 | } else if (ifp->if_flags & XFS_IFEXTIREC) { |
| 3961 | xfs_iext_remove_indirect(ifp, idx, ext_diff); |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 3962 | } else if (ifp->if_real_bytes) { |
| 3963 | xfs_iext_remove_direct(ifp, idx, ext_diff); |
| 3964 | } else { |
| 3965 | xfs_iext_remove_inline(ifp, idx, ext_diff); |
| 3966 | } |
| 3967 | ifp->if_bytes = new_size; |
| 3968 | } |
| 3969 | |
| 3970 | /* |
| 3971 | * This removes ext_diff extents from the inline buffer, beginning |
| 3972 | * at extent index idx. |
| 3973 | */ |
| 3974 | void |
| 3975 | xfs_iext_remove_inline( |
| 3976 | xfs_ifork_t *ifp, /* inode fork pointer */ |
| 3977 | xfs_extnum_t idx, /* index to begin removing exts */ |
| 3978 | int ext_diff) /* number of extents to remove */ |
| 3979 | { |
| 3980 | int nextents; /* number of extents in file */ |
| 3981 | |
Mandy Kirkconnell | 0293ce3 | 2006-03-14 13:30:23 +1100 | [diff] [blame] | 3982 | ASSERT(!(ifp->if_flags & XFS_IFEXTIREC)); |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 3983 | ASSERT(idx < XFS_INLINE_EXTS); |
| 3984 | nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); |
| 3985 | ASSERT(((nextents - ext_diff) > 0) && |
| 3986 | (nextents - ext_diff) < XFS_INLINE_EXTS); |
| 3987 | |
| 3988 | if (idx + ext_diff < nextents) { |
| 3989 | memmove(&ifp->if_u2.if_inline_ext[idx], |
| 3990 | &ifp->if_u2.if_inline_ext[idx + ext_diff], |
| 3991 | (nextents - (idx + ext_diff)) * |
| 3992 | sizeof(xfs_bmbt_rec_t)); |
| 3993 | memset(&ifp->if_u2.if_inline_ext[nextents - ext_diff], |
| 3994 | 0, ext_diff * sizeof(xfs_bmbt_rec_t)); |
| 3995 | } else { |
| 3996 | memset(&ifp->if_u2.if_inline_ext[idx], 0, |
| 3997 | ext_diff * sizeof(xfs_bmbt_rec_t)); |
| 3998 | } |
| 3999 | } |
| 4000 | |
| 4001 | /* |
| 4002 | * This removes ext_diff extents from a linear (direct) extent list, |
| 4003 | * beginning at extent index idx. If the extents are being removed |
| 4004 | * from the end of the list (ie. truncate) then we just need to re- |
| 4005 | * allocate the list to remove the extra space. Otherwise, if the |
| 4006 | * extents are being removed from the middle of the existing extent |
| 4007 | * entries, then we first need to move the extent records beginning |
| 4008 | * at idx + ext_diff up in the list to overwrite the records being |
| 4009 | * removed, then remove the extra space via kmem_realloc. |
| 4010 | */ |
| 4011 | void |
| 4012 | xfs_iext_remove_direct( |
| 4013 | xfs_ifork_t *ifp, /* inode fork pointer */ |
| 4014 | xfs_extnum_t idx, /* index to begin removing exts */ |
| 4015 | int ext_diff) /* number of extents to remove */ |
| 4016 | { |
| 4017 | xfs_extnum_t nextents; /* number of extents in file */ |
| 4018 | int new_size; /* size of extents after removal */ |
| 4019 | |
Mandy Kirkconnell | 0293ce3 | 2006-03-14 13:30:23 +1100 | [diff] [blame] | 4020 | ASSERT(!(ifp->if_flags & XFS_IFEXTIREC)); |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 4021 | new_size = ifp->if_bytes - |
| 4022 | (ext_diff * sizeof(xfs_bmbt_rec_t)); |
| 4023 | nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); |
| 4024 | |
| 4025 | if (new_size == 0) { |
| 4026 | xfs_iext_destroy(ifp); |
| 4027 | return; |
| 4028 | } |
| 4029 | /* Move extents up in the list (if needed) */ |
| 4030 | if (idx + ext_diff < nextents) { |
| 4031 | memmove(&ifp->if_u1.if_extents[idx], |
| 4032 | &ifp->if_u1.if_extents[idx + ext_diff], |
| 4033 | (nextents - (idx + ext_diff)) * |
| 4034 | sizeof(xfs_bmbt_rec_t)); |
| 4035 | } |
| 4036 | memset(&ifp->if_u1.if_extents[nextents - ext_diff], |
| 4037 | 0, ext_diff * sizeof(xfs_bmbt_rec_t)); |
| 4038 | /* |
| 4039 | * Reallocate the direct extent list. If the extents |
| 4040 | * will fit inside the inode then xfs_iext_realloc_direct |
| 4041 | * will switch from direct to inline extent allocation |
| 4042 | * mode for us. |
| 4043 | */ |
| 4044 | xfs_iext_realloc_direct(ifp, new_size); |
| 4045 | ifp->if_bytes = new_size; |
| 4046 | } |
| 4047 | |
| 4048 | /* |
Mandy Kirkconnell | 0293ce3 | 2006-03-14 13:30:23 +1100 | [diff] [blame] | 4049 | * This is called when incore extents are being removed from the |
| 4050 | * indirection array and the extents being removed span multiple extent |
| 4051 | * buffers. The idx parameter contains the file extent index where we |
| 4052 | * want to begin removing extents, and the count parameter contains |
| 4053 | * how many extents need to be removed. |
| 4054 | * |
| 4055 | * |-------| |-------| |
| 4056 | * | nex1 | | | nex1 - number of extents before idx |
| 4057 | * |-------| | count | |
| 4058 | * | | | | count - number of extents being removed at idx |
| 4059 | * | count | |-------| |
| 4060 | * | | | nex2 | nex2 - number of extents after idx + count |
| 4061 | * |-------| |-------| |
| 4062 | */ |
| 4063 | void |
| 4064 | xfs_iext_remove_indirect( |
| 4065 | xfs_ifork_t *ifp, /* inode fork pointer */ |
| 4066 | xfs_extnum_t idx, /* index to begin removing extents */ |
| 4067 | int count) /* number of extents to remove */ |
| 4068 | { |
| 4069 | xfs_ext_irec_t *erp; /* indirection array pointer */ |
| 4070 | int erp_idx = 0; /* indirection array index */ |
| 4071 | xfs_extnum_t ext_cnt; /* extents left to remove */ |
| 4072 | xfs_extnum_t ext_diff; /* extents to remove in current list */ |
| 4073 | xfs_extnum_t nex1; /* number of extents before idx */ |
| 4074 | xfs_extnum_t nex2; /* extents after idx + count */ |
Nathan Scott | c41564b | 2006-03-29 08:55:14 +1000 | [diff] [blame] | 4075 | int nlists; /* entries in indirection array */ |
Mandy Kirkconnell | 0293ce3 | 2006-03-14 13:30:23 +1100 | [diff] [blame] | 4076 | int page_idx = idx; /* index in target extent list */ |
| 4077 | |
| 4078 | ASSERT(ifp->if_flags & XFS_IFEXTIREC); |
| 4079 | erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 0); |
| 4080 | ASSERT(erp != NULL); |
| 4081 | nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; |
| 4082 | nex1 = page_idx; |
| 4083 | ext_cnt = count; |
| 4084 | while (ext_cnt) { |
| 4085 | nex2 = MAX((erp->er_extcount - (nex1 + ext_cnt)), 0); |
| 4086 | ext_diff = MIN(ext_cnt, (erp->er_extcount - nex1)); |
| 4087 | /* |
| 4088 | * Check for deletion of entire list; |
| 4089 | * xfs_iext_irec_remove() updates extent offsets. |
| 4090 | */ |
| 4091 | if (ext_diff == erp->er_extcount) { |
| 4092 | xfs_iext_irec_remove(ifp, erp_idx); |
| 4093 | ext_cnt -= ext_diff; |
| 4094 | nex1 = 0; |
| 4095 | if (ext_cnt) { |
| 4096 | ASSERT(erp_idx < ifp->if_real_bytes / |
| 4097 | XFS_IEXT_BUFSZ); |
| 4098 | erp = &ifp->if_u1.if_ext_irec[erp_idx]; |
| 4099 | nex1 = 0; |
| 4100 | continue; |
| 4101 | } else { |
| 4102 | break; |
| 4103 | } |
| 4104 | } |
| 4105 | /* Move extents up (if needed) */ |
| 4106 | if (nex2) { |
| 4107 | memmove(&erp->er_extbuf[nex1], |
| 4108 | &erp->er_extbuf[nex1 + ext_diff], |
| 4109 | nex2 * sizeof(xfs_bmbt_rec_t)); |
| 4110 | } |
| 4111 | /* Zero out rest of page */ |
| 4112 | memset(&erp->er_extbuf[nex1 + nex2], 0, (XFS_IEXT_BUFSZ - |
| 4113 | ((nex1 + nex2) * sizeof(xfs_bmbt_rec_t)))); |
| 4114 | /* Update remaining counters */ |
| 4115 | erp->er_extcount -= ext_diff; |
| 4116 | xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, -ext_diff); |
| 4117 | ext_cnt -= ext_diff; |
| 4118 | nex1 = 0; |
| 4119 | erp_idx++; |
| 4120 | erp++; |
| 4121 | } |
| 4122 | ifp->if_bytes -= count * sizeof(xfs_bmbt_rec_t); |
| 4123 | xfs_iext_irec_compact(ifp); |
| 4124 | } |
| 4125 | |
| 4126 | /* |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 4127 | * Create, destroy, or resize a linear (direct) block of extents. |
| 4128 | */ |
| 4129 | void |
| 4130 | xfs_iext_realloc_direct( |
| 4131 | xfs_ifork_t *ifp, /* inode fork pointer */ |
| 4132 | int new_size) /* new size of extents */ |
| 4133 | { |
| 4134 | int rnew_size; /* real new size of extents */ |
| 4135 | |
| 4136 | rnew_size = new_size; |
| 4137 | |
Mandy Kirkconnell | 0293ce3 | 2006-03-14 13:30:23 +1100 | [diff] [blame] | 4138 | ASSERT(!(ifp->if_flags & XFS_IFEXTIREC) || |
| 4139 | ((new_size >= 0) && (new_size <= XFS_IEXT_BUFSZ) && |
| 4140 | (new_size != ifp->if_real_bytes))); |
| 4141 | |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 4142 | /* Free extent records */ |
| 4143 | if (new_size == 0) { |
| 4144 | xfs_iext_destroy(ifp); |
| 4145 | } |
| 4146 | /* Resize direct extent list and zero any new bytes */ |
| 4147 | else if (ifp->if_real_bytes) { |
| 4148 | /* Check if extents will fit inside the inode */ |
| 4149 | if (new_size <= XFS_INLINE_EXTS * sizeof(xfs_bmbt_rec_t)) { |
| 4150 | xfs_iext_direct_to_inline(ifp, new_size / |
| 4151 | (uint)sizeof(xfs_bmbt_rec_t)); |
| 4152 | ifp->if_bytes = new_size; |
| 4153 | return; |
| 4154 | } |
| 4155 | if ((new_size & (new_size - 1)) != 0) { |
| 4156 | rnew_size = xfs_iroundup(new_size); |
| 4157 | } |
| 4158 | if (rnew_size != ifp->if_real_bytes) { |
| 4159 | ifp->if_u1.if_extents = (xfs_bmbt_rec_t *) |
| 4160 | kmem_realloc(ifp->if_u1.if_extents, |
| 4161 | rnew_size, |
| 4162 | ifp->if_real_bytes, |
| 4163 | KM_SLEEP); |
| 4164 | } |
| 4165 | if (rnew_size > ifp->if_real_bytes) { |
| 4166 | memset(&ifp->if_u1.if_extents[ifp->if_bytes / |
| 4167 | (uint)sizeof(xfs_bmbt_rec_t)], 0, |
| 4168 | rnew_size - ifp->if_real_bytes); |
| 4169 | } |
| 4170 | } |
| 4171 | /* |
| 4172 | * Switch from the inline extent buffer to a direct |
| 4173 | * extent list. Be sure to include the inline extent |
| 4174 | * bytes in new_size. |
| 4175 | */ |
| 4176 | else { |
| 4177 | new_size += ifp->if_bytes; |
| 4178 | if ((new_size & (new_size - 1)) != 0) { |
| 4179 | rnew_size = xfs_iroundup(new_size); |
| 4180 | } |
| 4181 | xfs_iext_inline_to_direct(ifp, rnew_size); |
| 4182 | } |
| 4183 | ifp->if_real_bytes = rnew_size; |
| 4184 | ifp->if_bytes = new_size; |
| 4185 | } |
| 4186 | |
| 4187 | /* |
| 4188 | * Switch from linear (direct) extent records to inline buffer. |
| 4189 | */ |
| 4190 | void |
| 4191 | xfs_iext_direct_to_inline( |
| 4192 | xfs_ifork_t *ifp, /* inode fork pointer */ |
| 4193 | xfs_extnum_t nextents) /* number of extents in file */ |
| 4194 | { |
| 4195 | ASSERT(ifp->if_flags & XFS_IFEXTENTS); |
| 4196 | ASSERT(nextents <= XFS_INLINE_EXTS); |
| 4197 | /* |
| 4198 | * The inline buffer was zeroed when we switched |
| 4199 | * from inline to direct extent allocation mode, |
| 4200 | * so we don't need to clear it here. |
| 4201 | */ |
| 4202 | memcpy(ifp->if_u2.if_inline_ext, ifp->if_u1.if_extents, |
| 4203 | nextents * sizeof(xfs_bmbt_rec_t)); |
Mandy Kirkconnell | fe6c1e7 | 2006-06-09 14:51:25 +1000 | [diff] [blame] | 4204 | kmem_free(ifp->if_u1.if_extents, ifp->if_real_bytes); |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 4205 | ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext; |
| 4206 | ifp->if_real_bytes = 0; |
| 4207 | } |
| 4208 | |
| 4209 | /* |
| 4210 | * Switch from inline buffer to linear (direct) extent records. |
| 4211 | * new_size should already be rounded up to the next power of 2 |
| 4212 | * by the caller (when appropriate), so use new_size as it is. |
| 4213 | * However, since new_size may be rounded up, we can't update |
| 4214 | * if_bytes here. It is the caller's responsibility to update |
| 4215 | * if_bytes upon return. |
| 4216 | */ |
| 4217 | void |
| 4218 | xfs_iext_inline_to_direct( |
| 4219 | xfs_ifork_t *ifp, /* inode fork pointer */ |
| 4220 | int new_size) /* number of extents in file */ |
| 4221 | { |
| 4222 | ifp->if_u1.if_extents = (xfs_bmbt_rec_t *) |
| 4223 | kmem_alloc(new_size, KM_SLEEP); |
| 4224 | memset(ifp->if_u1.if_extents, 0, new_size); |
| 4225 | if (ifp->if_bytes) { |
| 4226 | memcpy(ifp->if_u1.if_extents, ifp->if_u2.if_inline_ext, |
| 4227 | ifp->if_bytes); |
| 4228 | memset(ifp->if_u2.if_inline_ext, 0, XFS_INLINE_EXTS * |
| 4229 | sizeof(xfs_bmbt_rec_t)); |
| 4230 | } |
| 4231 | ifp->if_real_bytes = new_size; |
| 4232 | } |
| 4233 | |
| 4234 | /* |
Mandy Kirkconnell | 0293ce3 | 2006-03-14 13:30:23 +1100 | [diff] [blame] | 4235 | * Resize an extent indirection array to new_size bytes. |
| 4236 | */ |
| 4237 | void |
| 4238 | xfs_iext_realloc_indirect( |
| 4239 | xfs_ifork_t *ifp, /* inode fork pointer */ |
| 4240 | int new_size) /* new indirection array size */ |
| 4241 | { |
| 4242 | int nlists; /* number of irec's (ex lists) */ |
| 4243 | int size; /* current indirection array size */ |
| 4244 | |
| 4245 | ASSERT(ifp->if_flags & XFS_IFEXTIREC); |
| 4246 | nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; |
| 4247 | size = nlists * sizeof(xfs_ext_irec_t); |
| 4248 | ASSERT(ifp->if_real_bytes); |
| 4249 | ASSERT((new_size >= 0) && (new_size != size)); |
| 4250 | if (new_size == 0) { |
| 4251 | xfs_iext_destroy(ifp); |
| 4252 | } else { |
| 4253 | ifp->if_u1.if_ext_irec = (xfs_ext_irec_t *) |
| 4254 | kmem_realloc(ifp->if_u1.if_ext_irec, |
| 4255 | new_size, size, KM_SLEEP); |
| 4256 | } |
| 4257 | } |
| 4258 | |
| 4259 | /* |
| 4260 | * Switch from indirection array to linear (direct) extent allocations. |
| 4261 | */ |
| 4262 | void |
| 4263 | xfs_iext_indirect_to_direct( |
| 4264 | xfs_ifork_t *ifp) /* inode fork pointer */ |
| 4265 | { |
| 4266 | xfs_bmbt_rec_t *ep; /* extent record pointer */ |
| 4267 | xfs_extnum_t nextents; /* number of extents in file */ |
| 4268 | int size; /* size of file extents */ |
| 4269 | |
| 4270 | ASSERT(ifp->if_flags & XFS_IFEXTIREC); |
| 4271 | nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); |
| 4272 | ASSERT(nextents <= XFS_LINEAR_EXTS); |
| 4273 | size = nextents * sizeof(xfs_bmbt_rec_t); |
| 4274 | |
| 4275 | xfs_iext_irec_compact_full(ifp); |
| 4276 | ASSERT(ifp->if_real_bytes == XFS_IEXT_BUFSZ); |
| 4277 | |
| 4278 | ep = ifp->if_u1.if_ext_irec->er_extbuf; |
| 4279 | kmem_free(ifp->if_u1.if_ext_irec, sizeof(xfs_ext_irec_t)); |
| 4280 | ifp->if_flags &= ~XFS_IFEXTIREC; |
| 4281 | ifp->if_u1.if_extents = ep; |
| 4282 | ifp->if_bytes = size; |
| 4283 | if (nextents < XFS_LINEAR_EXTS) { |
| 4284 | xfs_iext_realloc_direct(ifp, size); |
| 4285 | } |
| 4286 | } |
| 4287 | |
| 4288 | /* |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 4289 | * Free incore file extents. |
| 4290 | */ |
| 4291 | void |
| 4292 | xfs_iext_destroy( |
| 4293 | xfs_ifork_t *ifp) /* inode fork pointer */ |
| 4294 | { |
Mandy Kirkconnell | 0293ce3 | 2006-03-14 13:30:23 +1100 | [diff] [blame] | 4295 | if (ifp->if_flags & XFS_IFEXTIREC) { |
| 4296 | int erp_idx; |
| 4297 | int nlists; |
| 4298 | |
| 4299 | nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; |
| 4300 | for (erp_idx = nlists - 1; erp_idx >= 0 ; erp_idx--) { |
| 4301 | xfs_iext_irec_remove(ifp, erp_idx); |
| 4302 | } |
| 4303 | ifp->if_flags &= ~XFS_IFEXTIREC; |
| 4304 | } else if (ifp->if_real_bytes) { |
Mandy Kirkconnell | 4eea22f | 2006-03-14 13:29:52 +1100 | [diff] [blame] | 4305 | kmem_free(ifp->if_u1.if_extents, ifp->if_real_bytes); |
| 4306 | } else if (ifp->if_bytes) { |
| 4307 | memset(ifp->if_u2.if_inline_ext, 0, XFS_INLINE_EXTS * |
| 4308 | sizeof(xfs_bmbt_rec_t)); |
| 4309 | } |
| 4310 | ifp->if_u1.if_extents = NULL; |
| 4311 | ifp->if_real_bytes = 0; |
| 4312 | ifp->if_bytes = 0; |
| 4313 | } |
Mandy Kirkconnell | 0293ce3 | 2006-03-14 13:30:23 +1100 | [diff] [blame] | 4314 | |
| 4315 | /* |
Mandy Kirkconnell | 8867bc9 | 2006-03-17 17:25:04 +1100 | [diff] [blame] | 4316 | * Return a pointer to the extent record for file system block bno. |
| 4317 | */ |
| 4318 | xfs_bmbt_rec_t * /* pointer to found extent record */ |
| 4319 | xfs_iext_bno_to_ext( |
| 4320 | xfs_ifork_t *ifp, /* inode fork pointer */ |
| 4321 | xfs_fileoff_t bno, /* block number to search for */ |
| 4322 | xfs_extnum_t *idxp) /* index of target extent */ |
| 4323 | { |
| 4324 | xfs_bmbt_rec_t *base; /* pointer to first extent */ |
| 4325 | xfs_filblks_t blockcount = 0; /* number of blocks in extent */ |
| 4326 | xfs_bmbt_rec_t *ep = NULL; /* pointer to target extent */ |
| 4327 | xfs_ext_irec_t *erp = NULL; /* indirection array pointer */ |
Nathan Scott | c41564b | 2006-03-29 08:55:14 +1000 | [diff] [blame] | 4328 | int high; /* upper boundary in search */ |
Mandy Kirkconnell | 8867bc9 | 2006-03-17 17:25:04 +1100 | [diff] [blame] | 4329 | xfs_extnum_t idx = 0; /* index of target extent */ |
Nathan Scott | c41564b | 2006-03-29 08:55:14 +1000 | [diff] [blame] | 4330 | int low; /* lower boundary in search */ |
Mandy Kirkconnell | 8867bc9 | 2006-03-17 17:25:04 +1100 | [diff] [blame] | 4331 | xfs_extnum_t nextents; /* number of file extents */ |
| 4332 | xfs_fileoff_t startoff = 0; /* start offset of extent */ |
| 4333 | |
| 4334 | nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); |
| 4335 | if (nextents == 0) { |
| 4336 | *idxp = 0; |
| 4337 | return NULL; |
| 4338 | } |
| 4339 | low = 0; |
| 4340 | if (ifp->if_flags & XFS_IFEXTIREC) { |
| 4341 | /* Find target extent list */ |
| 4342 | int erp_idx = 0; |
| 4343 | erp = xfs_iext_bno_to_irec(ifp, bno, &erp_idx); |
| 4344 | base = erp->er_extbuf; |
| 4345 | high = erp->er_extcount - 1; |
| 4346 | } else { |
| 4347 | base = ifp->if_u1.if_extents; |
| 4348 | high = nextents - 1; |
| 4349 | } |
| 4350 | /* Binary search extent records */ |
| 4351 | while (low <= high) { |
| 4352 | idx = (low + high) >> 1; |
| 4353 | ep = base + idx; |
| 4354 | startoff = xfs_bmbt_get_startoff(ep); |
| 4355 | blockcount = xfs_bmbt_get_blockcount(ep); |
| 4356 | if (bno < startoff) { |
| 4357 | high = idx - 1; |
| 4358 | } else if (bno >= startoff + blockcount) { |
| 4359 | low = idx + 1; |
| 4360 | } else { |
| 4361 | /* Convert back to file-based extent index */ |
| 4362 | if (ifp->if_flags & XFS_IFEXTIREC) { |
| 4363 | idx += erp->er_extoff; |
| 4364 | } |
| 4365 | *idxp = idx; |
| 4366 | return ep; |
| 4367 | } |
| 4368 | } |
| 4369 | /* Convert back to file-based extent index */ |
| 4370 | if (ifp->if_flags & XFS_IFEXTIREC) { |
| 4371 | idx += erp->er_extoff; |
| 4372 | } |
| 4373 | if (bno >= startoff + blockcount) { |
| 4374 | if (++idx == nextents) { |
| 4375 | ep = NULL; |
| 4376 | } else { |
| 4377 | ep = xfs_iext_get_ext(ifp, idx); |
| 4378 | } |
| 4379 | } |
| 4380 | *idxp = idx; |
| 4381 | return ep; |
| 4382 | } |
| 4383 | |
| 4384 | /* |
Mandy Kirkconnell | 0293ce3 | 2006-03-14 13:30:23 +1100 | [diff] [blame] | 4385 | * Return a pointer to the indirection array entry containing the |
| 4386 | * extent record for filesystem block bno. Store the index of the |
| 4387 | * target irec in *erp_idxp. |
| 4388 | */ |
Mandy Kirkconnell | 8867bc9 | 2006-03-17 17:25:04 +1100 | [diff] [blame] | 4389 | xfs_ext_irec_t * /* pointer to found extent record */ |
Mandy Kirkconnell | 0293ce3 | 2006-03-14 13:30:23 +1100 | [diff] [blame] | 4390 | xfs_iext_bno_to_irec( |
| 4391 | xfs_ifork_t *ifp, /* inode fork pointer */ |
| 4392 | xfs_fileoff_t bno, /* block number to search for */ |
| 4393 | int *erp_idxp) /* irec index of target ext list */ |
| 4394 | { |
| 4395 | xfs_ext_irec_t *erp = NULL; /* indirection array pointer */ |
| 4396 | xfs_ext_irec_t *erp_next; /* next indirection array entry */ |
Mandy Kirkconnell | 8867bc9 | 2006-03-17 17:25:04 +1100 | [diff] [blame] | 4397 | int erp_idx; /* indirection array index */ |
Mandy Kirkconnell | 0293ce3 | 2006-03-14 13:30:23 +1100 | [diff] [blame] | 4398 | int nlists; /* number of extent irec's (lists) */ |
| 4399 | int high; /* binary search upper limit */ |
| 4400 | int low; /* binary search lower limit */ |
| 4401 | |
| 4402 | ASSERT(ifp->if_flags & XFS_IFEXTIREC); |
| 4403 | nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; |
| 4404 | erp_idx = 0; |
| 4405 | low = 0; |
| 4406 | high = nlists - 1; |
| 4407 | while (low <= high) { |
| 4408 | erp_idx = (low + high) >> 1; |
| 4409 | erp = &ifp->if_u1.if_ext_irec[erp_idx]; |
| 4410 | erp_next = erp_idx < nlists - 1 ? erp + 1 : NULL; |
| 4411 | if (bno < xfs_bmbt_get_startoff(erp->er_extbuf)) { |
| 4412 | high = erp_idx - 1; |
| 4413 | } else if (erp_next && bno >= |
| 4414 | xfs_bmbt_get_startoff(erp_next->er_extbuf)) { |
| 4415 | low = erp_idx + 1; |
| 4416 | } else { |
| 4417 | break; |
| 4418 | } |
| 4419 | } |
| 4420 | *erp_idxp = erp_idx; |
| 4421 | return erp; |
| 4422 | } |
| 4423 | |
| 4424 | /* |
| 4425 | * Return a pointer to the indirection array entry containing the |
| 4426 | * extent record at file extent index *idxp. Store the index of the |
| 4427 | * target irec in *erp_idxp and store the page index of the target |
| 4428 | * extent record in *idxp. |
| 4429 | */ |
| 4430 | xfs_ext_irec_t * |
| 4431 | xfs_iext_idx_to_irec( |
| 4432 | xfs_ifork_t *ifp, /* inode fork pointer */ |
| 4433 | xfs_extnum_t *idxp, /* extent index (file -> page) */ |
| 4434 | int *erp_idxp, /* pointer to target irec */ |
| 4435 | int realloc) /* new bytes were just added */ |
| 4436 | { |
| 4437 | xfs_ext_irec_t *prev; /* pointer to previous irec */ |
| 4438 | xfs_ext_irec_t *erp = NULL; /* pointer to current irec */ |
| 4439 | int erp_idx; /* indirection array index */ |
| 4440 | int nlists; /* number of irec's (ex lists) */ |
| 4441 | int high; /* binary search upper limit */ |
| 4442 | int low; /* binary search lower limit */ |
| 4443 | xfs_extnum_t page_idx = *idxp; /* extent index in target list */ |
| 4444 | |
| 4445 | ASSERT(ifp->if_flags & XFS_IFEXTIREC); |
| 4446 | ASSERT(page_idx >= 0 && page_idx <= |
| 4447 | ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)); |
| 4448 | nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; |
| 4449 | erp_idx = 0; |
| 4450 | low = 0; |
| 4451 | high = nlists - 1; |
| 4452 | |
| 4453 | /* Binary search extent irec's */ |
| 4454 | while (low <= high) { |
| 4455 | erp_idx = (low + high) >> 1; |
| 4456 | erp = &ifp->if_u1.if_ext_irec[erp_idx]; |
| 4457 | prev = erp_idx > 0 ? erp - 1 : NULL; |
| 4458 | if (page_idx < erp->er_extoff || (page_idx == erp->er_extoff && |
| 4459 | realloc && prev && prev->er_extcount < XFS_LINEAR_EXTS)) { |
| 4460 | high = erp_idx - 1; |
| 4461 | } else if (page_idx > erp->er_extoff + erp->er_extcount || |
| 4462 | (page_idx == erp->er_extoff + erp->er_extcount && |
| 4463 | !realloc)) { |
| 4464 | low = erp_idx + 1; |
| 4465 | } else if (page_idx == erp->er_extoff + erp->er_extcount && |
| 4466 | erp->er_extcount == XFS_LINEAR_EXTS) { |
| 4467 | ASSERT(realloc); |
| 4468 | page_idx = 0; |
| 4469 | erp_idx++; |
| 4470 | erp = erp_idx < nlists ? erp + 1 : NULL; |
| 4471 | break; |
| 4472 | } else { |
| 4473 | page_idx -= erp->er_extoff; |
| 4474 | break; |
| 4475 | } |
| 4476 | } |
| 4477 | *idxp = page_idx; |
| 4478 | *erp_idxp = erp_idx; |
| 4479 | return(erp); |
| 4480 | } |
| 4481 | |
| 4482 | /* |
| 4483 | * Allocate and initialize an indirection array once the space needed |
| 4484 | * for incore extents increases above XFS_IEXT_BUFSZ. |
| 4485 | */ |
| 4486 | void |
| 4487 | xfs_iext_irec_init( |
| 4488 | xfs_ifork_t *ifp) /* inode fork pointer */ |
| 4489 | { |
| 4490 | xfs_ext_irec_t *erp; /* indirection array pointer */ |
| 4491 | xfs_extnum_t nextents; /* number of extents in file */ |
| 4492 | |
| 4493 | ASSERT(!(ifp->if_flags & XFS_IFEXTIREC)); |
| 4494 | nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); |
| 4495 | ASSERT(nextents <= XFS_LINEAR_EXTS); |
| 4496 | |
| 4497 | erp = (xfs_ext_irec_t *) |
| 4498 | kmem_alloc(sizeof(xfs_ext_irec_t), KM_SLEEP); |
| 4499 | |
| 4500 | if (nextents == 0) { |
| 4501 | ifp->if_u1.if_extents = (xfs_bmbt_rec_t *) |
| 4502 | kmem_alloc(XFS_IEXT_BUFSZ, KM_SLEEP); |
| 4503 | } else if (!ifp->if_real_bytes) { |
| 4504 | xfs_iext_inline_to_direct(ifp, XFS_IEXT_BUFSZ); |
| 4505 | } else if (ifp->if_real_bytes < XFS_IEXT_BUFSZ) { |
| 4506 | xfs_iext_realloc_direct(ifp, XFS_IEXT_BUFSZ); |
| 4507 | } |
| 4508 | erp->er_extbuf = ifp->if_u1.if_extents; |
| 4509 | erp->er_extcount = nextents; |
| 4510 | erp->er_extoff = 0; |
| 4511 | |
| 4512 | ifp->if_flags |= XFS_IFEXTIREC; |
| 4513 | ifp->if_real_bytes = XFS_IEXT_BUFSZ; |
| 4514 | ifp->if_bytes = nextents * sizeof(xfs_bmbt_rec_t); |
| 4515 | ifp->if_u1.if_ext_irec = erp; |
| 4516 | |
| 4517 | return; |
| 4518 | } |
| 4519 | |
| 4520 | /* |
| 4521 | * Allocate and initialize a new entry in the indirection array. |
| 4522 | */ |
| 4523 | xfs_ext_irec_t * |
| 4524 | xfs_iext_irec_new( |
| 4525 | xfs_ifork_t *ifp, /* inode fork pointer */ |
| 4526 | int erp_idx) /* index for new irec */ |
| 4527 | { |
| 4528 | xfs_ext_irec_t *erp; /* indirection array pointer */ |
| 4529 | int i; /* loop counter */ |
| 4530 | int nlists; /* number of irec's (ex lists) */ |
| 4531 | |
| 4532 | ASSERT(ifp->if_flags & XFS_IFEXTIREC); |
| 4533 | nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; |
| 4534 | |
| 4535 | /* Resize indirection array */ |
| 4536 | xfs_iext_realloc_indirect(ifp, ++nlists * |
| 4537 | sizeof(xfs_ext_irec_t)); |
| 4538 | /* |
| 4539 | * Move records down in the array so the |
| 4540 | * new page can use erp_idx. |
| 4541 | */ |
| 4542 | erp = ifp->if_u1.if_ext_irec; |
| 4543 | for (i = nlists - 1; i > erp_idx; i--) { |
| 4544 | memmove(&erp[i], &erp[i-1], sizeof(xfs_ext_irec_t)); |
| 4545 | } |
| 4546 | ASSERT(i == erp_idx); |
| 4547 | |
| 4548 | /* Initialize new extent record */ |
| 4549 | erp = ifp->if_u1.if_ext_irec; |
| 4550 | erp[erp_idx].er_extbuf = (xfs_bmbt_rec_t *) |
| 4551 | kmem_alloc(XFS_IEXT_BUFSZ, KM_SLEEP); |
| 4552 | ifp->if_real_bytes = nlists * XFS_IEXT_BUFSZ; |
| 4553 | memset(erp[erp_idx].er_extbuf, 0, XFS_IEXT_BUFSZ); |
| 4554 | erp[erp_idx].er_extcount = 0; |
| 4555 | erp[erp_idx].er_extoff = erp_idx > 0 ? |
| 4556 | erp[erp_idx-1].er_extoff + erp[erp_idx-1].er_extcount : 0; |
| 4557 | return (&erp[erp_idx]); |
| 4558 | } |
| 4559 | |
| 4560 | /* |
| 4561 | * Remove a record from the indirection array. |
| 4562 | */ |
| 4563 | void |
| 4564 | xfs_iext_irec_remove( |
| 4565 | xfs_ifork_t *ifp, /* inode fork pointer */ |
| 4566 | int erp_idx) /* irec index to remove */ |
| 4567 | { |
| 4568 | xfs_ext_irec_t *erp; /* indirection array pointer */ |
| 4569 | int i; /* loop counter */ |
| 4570 | int nlists; /* number of irec's (ex lists) */ |
| 4571 | |
| 4572 | ASSERT(ifp->if_flags & XFS_IFEXTIREC); |
| 4573 | nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; |
| 4574 | erp = &ifp->if_u1.if_ext_irec[erp_idx]; |
| 4575 | if (erp->er_extbuf) { |
| 4576 | xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, |
| 4577 | -erp->er_extcount); |
| 4578 | kmem_free(erp->er_extbuf, XFS_IEXT_BUFSZ); |
| 4579 | } |
| 4580 | /* Compact extent records */ |
| 4581 | erp = ifp->if_u1.if_ext_irec; |
| 4582 | for (i = erp_idx; i < nlists - 1; i++) { |
| 4583 | memmove(&erp[i], &erp[i+1], sizeof(xfs_ext_irec_t)); |
| 4584 | } |
| 4585 | /* |
| 4586 | * Manually free the last extent record from the indirection |
| 4587 | * array. A call to xfs_iext_realloc_indirect() with a size |
| 4588 | * of zero would result in a call to xfs_iext_destroy() which |
| 4589 | * would in turn call this function again, creating a nasty |
| 4590 | * infinite loop. |
| 4591 | */ |
| 4592 | if (--nlists) { |
| 4593 | xfs_iext_realloc_indirect(ifp, |
| 4594 | nlists * sizeof(xfs_ext_irec_t)); |
| 4595 | } else { |
| 4596 | kmem_free(ifp->if_u1.if_ext_irec, |
| 4597 | sizeof(xfs_ext_irec_t)); |
| 4598 | } |
| 4599 | ifp->if_real_bytes = nlists * XFS_IEXT_BUFSZ; |
| 4600 | } |
| 4601 | |
| 4602 | /* |
| 4603 | * This is called to clean up large amounts of unused memory allocated |
| 4604 | * by the indirection array. Before compacting anything though, verify |
| 4605 | * that the indirection array is still needed and switch back to the |
| 4606 | * linear extent list (or even the inline buffer) if possible. The |
| 4607 | * compaction policy is as follows: |
| 4608 | * |
| 4609 | * Full Compaction: Extents fit into a single page (or inline buffer) |
| 4610 | * Full Compaction: Extents occupy less than 10% of allocated space |
| 4611 | * Partial Compaction: Extents occupy > 10% and < 50% of allocated space |
| 4612 | * No Compaction: Extents occupy at least 50% of allocated space |
| 4613 | */ |
| 4614 | void |
| 4615 | xfs_iext_irec_compact( |
| 4616 | xfs_ifork_t *ifp) /* inode fork pointer */ |
| 4617 | { |
| 4618 | xfs_extnum_t nextents; /* number of extents in file */ |
| 4619 | int nlists; /* number of irec's (ex lists) */ |
| 4620 | |
| 4621 | ASSERT(ifp->if_flags & XFS_IFEXTIREC); |
| 4622 | nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; |
| 4623 | nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); |
| 4624 | |
| 4625 | if (nextents == 0) { |
| 4626 | xfs_iext_destroy(ifp); |
| 4627 | } else if (nextents <= XFS_INLINE_EXTS) { |
| 4628 | xfs_iext_indirect_to_direct(ifp); |
| 4629 | xfs_iext_direct_to_inline(ifp, nextents); |
| 4630 | } else if (nextents <= XFS_LINEAR_EXTS) { |
| 4631 | xfs_iext_indirect_to_direct(ifp); |
| 4632 | } else if (nextents < (nlists * XFS_LINEAR_EXTS) >> 3) { |
| 4633 | xfs_iext_irec_compact_full(ifp); |
| 4634 | } else if (nextents < (nlists * XFS_LINEAR_EXTS) >> 1) { |
| 4635 | xfs_iext_irec_compact_pages(ifp); |
| 4636 | } |
| 4637 | } |
| 4638 | |
| 4639 | /* |
| 4640 | * Combine extents from neighboring extent pages. |
| 4641 | */ |
| 4642 | void |
| 4643 | xfs_iext_irec_compact_pages( |
| 4644 | xfs_ifork_t *ifp) /* inode fork pointer */ |
| 4645 | { |
| 4646 | xfs_ext_irec_t *erp, *erp_next;/* pointers to irec entries */ |
| 4647 | int erp_idx = 0; /* indirection array index */ |
| 4648 | int nlists; /* number of irec's (ex lists) */ |
| 4649 | |
| 4650 | ASSERT(ifp->if_flags & XFS_IFEXTIREC); |
| 4651 | nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; |
| 4652 | while (erp_idx < nlists - 1) { |
| 4653 | erp = &ifp->if_u1.if_ext_irec[erp_idx]; |
| 4654 | erp_next = erp + 1; |
| 4655 | if (erp_next->er_extcount <= |
| 4656 | (XFS_LINEAR_EXTS - erp->er_extcount)) { |
| 4657 | memmove(&erp->er_extbuf[erp->er_extcount], |
| 4658 | erp_next->er_extbuf, erp_next->er_extcount * |
| 4659 | sizeof(xfs_bmbt_rec_t)); |
| 4660 | erp->er_extcount += erp_next->er_extcount; |
| 4661 | /* |
| 4662 | * Free page before removing extent record |
| 4663 | * so er_extoffs don't get modified in |
| 4664 | * xfs_iext_irec_remove. |
| 4665 | */ |
| 4666 | kmem_free(erp_next->er_extbuf, XFS_IEXT_BUFSZ); |
| 4667 | erp_next->er_extbuf = NULL; |
| 4668 | xfs_iext_irec_remove(ifp, erp_idx + 1); |
| 4669 | nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; |
| 4670 | } else { |
| 4671 | erp_idx++; |
| 4672 | } |
| 4673 | } |
| 4674 | } |
| 4675 | |
| 4676 | /* |
| 4677 | * Fully compact the extent records managed by the indirection array. |
| 4678 | */ |
| 4679 | void |
| 4680 | xfs_iext_irec_compact_full( |
| 4681 | xfs_ifork_t *ifp) /* inode fork pointer */ |
| 4682 | { |
| 4683 | xfs_bmbt_rec_t *ep, *ep_next; /* extent record pointers */ |
| 4684 | xfs_ext_irec_t *erp, *erp_next; /* extent irec pointers */ |
| 4685 | int erp_idx = 0; /* extent irec index */ |
| 4686 | int ext_avail; /* empty entries in ex list */ |
| 4687 | int ext_diff; /* number of exts to add */ |
| 4688 | int nlists; /* number of irec's (ex lists) */ |
| 4689 | |
| 4690 | ASSERT(ifp->if_flags & XFS_IFEXTIREC); |
| 4691 | nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; |
| 4692 | erp = ifp->if_u1.if_ext_irec; |
| 4693 | ep = &erp->er_extbuf[erp->er_extcount]; |
| 4694 | erp_next = erp + 1; |
| 4695 | ep_next = erp_next->er_extbuf; |
| 4696 | while (erp_idx < nlists - 1) { |
| 4697 | ext_avail = XFS_LINEAR_EXTS - erp->er_extcount; |
| 4698 | ext_diff = MIN(ext_avail, erp_next->er_extcount); |
| 4699 | memcpy(ep, ep_next, ext_diff * sizeof(xfs_bmbt_rec_t)); |
| 4700 | erp->er_extcount += ext_diff; |
| 4701 | erp_next->er_extcount -= ext_diff; |
| 4702 | /* Remove next page */ |
| 4703 | if (erp_next->er_extcount == 0) { |
| 4704 | /* |
| 4705 | * Free page before removing extent record |
| 4706 | * so er_extoffs don't get modified in |
| 4707 | * xfs_iext_irec_remove. |
| 4708 | */ |
| 4709 | kmem_free(erp_next->er_extbuf, |
| 4710 | erp_next->er_extcount * sizeof(xfs_bmbt_rec_t)); |
| 4711 | erp_next->er_extbuf = NULL; |
| 4712 | xfs_iext_irec_remove(ifp, erp_idx + 1); |
| 4713 | erp = &ifp->if_u1.if_ext_irec[erp_idx]; |
| 4714 | nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; |
| 4715 | /* Update next page */ |
| 4716 | } else { |
| 4717 | /* Move rest of page up to become next new page */ |
| 4718 | memmove(erp_next->er_extbuf, ep_next, |
| 4719 | erp_next->er_extcount * sizeof(xfs_bmbt_rec_t)); |
| 4720 | ep_next = erp_next->er_extbuf; |
| 4721 | memset(&ep_next[erp_next->er_extcount], 0, |
| 4722 | (XFS_LINEAR_EXTS - erp_next->er_extcount) * |
| 4723 | sizeof(xfs_bmbt_rec_t)); |
| 4724 | } |
| 4725 | if (erp->er_extcount == XFS_LINEAR_EXTS) { |
| 4726 | erp_idx++; |
| 4727 | if (erp_idx < nlists) |
| 4728 | erp = &ifp->if_u1.if_ext_irec[erp_idx]; |
| 4729 | else |
| 4730 | break; |
| 4731 | } |
| 4732 | ep = &erp->er_extbuf[erp->er_extcount]; |
| 4733 | erp_next = erp + 1; |
| 4734 | ep_next = erp_next->er_extbuf; |
| 4735 | } |
| 4736 | } |
| 4737 | |
| 4738 | /* |
| 4739 | * This is called to update the er_extoff field in the indirection |
| 4740 | * array when extents have been added or removed from one of the |
| 4741 | * extent lists. erp_idx contains the irec index to begin updating |
| 4742 | * at and ext_diff contains the number of extents that were added |
| 4743 | * or removed. |
| 4744 | */ |
| 4745 | void |
| 4746 | xfs_iext_irec_update_extoffs( |
| 4747 | xfs_ifork_t *ifp, /* inode fork pointer */ |
| 4748 | int erp_idx, /* irec index to update */ |
| 4749 | int ext_diff) /* number of new extents */ |
| 4750 | { |
| 4751 | int i; /* loop counter */ |
| 4752 | int nlists; /* number of irec's (ex lists */ |
| 4753 | |
| 4754 | ASSERT(ifp->if_flags & XFS_IFEXTIREC); |
| 4755 | nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; |
| 4756 | for (i = erp_idx; i < nlists; i++) { |
| 4757 | ifp->if_u1.if_ext_irec[i].er_extoff += ext_diff; |
| 4758 | } |
| 4759 | } |