Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2000-2006 Silicon Graphics, Inc. |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 3 | * Copyright (c) 2012 Red Hat, Inc. |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 4 | * All Rights Reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it would be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write the Free Software Foundation, |
| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | */ |
| 19 | #include "xfs.h" |
| 20 | #include "xfs_fs.h" |
Dave Chinner | 70a9883c | 2013-10-23 10:36:05 +1100 | [diff] [blame] | 21 | #include "xfs_shared.h" |
Dave Chinner | 239880e | 2013-10-23 10:50:10 +1100 | [diff] [blame] | 22 | #include "xfs_format.h" |
| 23 | #include "xfs_log_format.h" |
| 24 | #include "xfs_trans_resv.h" |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 25 | #include "xfs_bit.h" |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 26 | #include "xfs_mount.h" |
Dave Chinner | 5706278 | 2013-10-15 09:17:51 +1100 | [diff] [blame] | 27 | #include "xfs_da_format.h" |
Darrick J. Wong | 3ab78df | 2016-08-03 11:15:38 +1000 | [diff] [blame^] | 28 | #include "xfs_defer.h" |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 29 | #include "xfs_inode.h" |
| 30 | #include "xfs_btree.h" |
Dave Chinner | 239880e | 2013-10-23 10:50:10 +1100 | [diff] [blame] | 31 | #include "xfs_trans.h" |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 32 | #include "xfs_extfree_item.h" |
| 33 | #include "xfs_alloc.h" |
| 34 | #include "xfs_bmap.h" |
| 35 | #include "xfs_bmap_util.h" |
Dave Chinner | a4fbe6a | 2013-10-23 10:51:50 +1100 | [diff] [blame] | 36 | #include "xfs_bmap_btree.h" |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 37 | #include "xfs_rtalloc.h" |
| 38 | #include "xfs_error.h" |
| 39 | #include "xfs_quota.h" |
| 40 | #include "xfs_trans_space.h" |
| 41 | #include "xfs_trace.h" |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 42 | #include "xfs_icache.h" |
Dave Chinner | 239880e | 2013-10-23 10:50:10 +1100 | [diff] [blame] | 43 | #include "xfs_log.h" |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 44 | |
| 45 | /* Kernel only BMAP related definitions and functions */ |
| 46 | |
| 47 | /* |
| 48 | * Convert the given file system block to a disk block. We have to treat it |
| 49 | * differently based on whether the file is a real time file or not, because the |
| 50 | * bmap code does. |
| 51 | */ |
| 52 | xfs_daddr_t |
| 53 | xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb) |
| 54 | { |
| 55 | return (XFS_IS_REALTIME_INODE(ip) ? \ |
| 56 | (xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \ |
| 57 | XFS_FSB_TO_DADDR((ip)->i_mount, (fsb))); |
| 58 | } |
| 59 | |
| 60 | /* |
Dave Chinner | 3fbbbea | 2015-11-03 12:27:22 +1100 | [diff] [blame] | 61 | * Routine to zero an extent on disk allocated to the specific inode. |
| 62 | * |
| 63 | * The VFS functions take a linearised filesystem block offset, so we have to |
| 64 | * convert the sparse xfs fsb to the right format first. |
| 65 | * VFS types are real funky, too. |
| 66 | */ |
| 67 | int |
| 68 | xfs_zero_extent( |
| 69 | struct xfs_inode *ip, |
| 70 | xfs_fsblock_t start_fsb, |
| 71 | xfs_off_t count_fsb) |
| 72 | { |
| 73 | struct xfs_mount *mp = ip->i_mount; |
| 74 | xfs_daddr_t sector = xfs_fsb_to_db(ip, start_fsb); |
| 75 | sector_t block = XFS_BB_TO_FSBT(mp, sector); |
Dave Chinner | 3fbbbea | 2015-11-03 12:27:22 +1100 | [diff] [blame] | 76 | |
Matthew Wilcox | 3dc2916 | 2016-03-15 11:20:41 -0600 | [diff] [blame] | 77 | return blkdev_issue_zeroout(xfs_find_bdev_for_inode(VFS_I(ip)), |
| 78 | block << (mp->m_super->s_blocksize_bits - 9), |
| 79 | count_fsb << (mp->m_super->s_blocksize_bits - 9), |
| 80 | GFP_NOFS, true); |
Dave Chinner | 3fbbbea | 2015-11-03 12:27:22 +1100 | [diff] [blame] | 81 | } |
| 82 | |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 83 | int |
| 84 | xfs_bmap_rtalloc( |
| 85 | struct xfs_bmalloca *ap) /* bmap alloc argument struct */ |
| 86 | { |
| 87 | xfs_alloctype_t atype = 0; /* type for allocation routines */ |
| 88 | int error; /* error return value */ |
| 89 | xfs_mount_t *mp; /* mount point structure */ |
| 90 | xfs_extlen_t prod = 0; /* product factor for allocators */ |
| 91 | xfs_extlen_t ralen = 0; /* realtime allocation length */ |
| 92 | xfs_extlen_t align; /* minimum allocation alignment */ |
| 93 | xfs_rtblock_t rtb; |
| 94 | |
| 95 | mp = ap->ip->i_mount; |
| 96 | align = xfs_get_extsz_hint(ap->ip); |
| 97 | prod = align / mp->m_sb.sb_rextsize; |
| 98 | error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev, |
| 99 | align, 1, ap->eof, 0, |
| 100 | ap->conv, &ap->offset, &ap->length); |
| 101 | if (error) |
| 102 | return error; |
| 103 | ASSERT(ap->length); |
| 104 | ASSERT(ap->length % mp->m_sb.sb_rextsize == 0); |
| 105 | |
| 106 | /* |
| 107 | * If the offset & length are not perfectly aligned |
| 108 | * then kill prod, it will just get us in trouble. |
| 109 | */ |
| 110 | if (do_mod(ap->offset, align) || ap->length % align) |
| 111 | prod = 1; |
| 112 | /* |
| 113 | * Set ralen to be the actual requested length in rtextents. |
| 114 | */ |
| 115 | ralen = ap->length / mp->m_sb.sb_rextsize; |
| 116 | /* |
| 117 | * If the old value was close enough to MAXEXTLEN that |
| 118 | * we rounded up to it, cut it back so it's valid again. |
| 119 | * Note that if it's a really large request (bigger than |
| 120 | * MAXEXTLEN), we don't hear about that number, and can't |
| 121 | * adjust the starting point to match it. |
| 122 | */ |
| 123 | if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN) |
| 124 | ralen = MAXEXTLEN / mp->m_sb.sb_rextsize; |
| 125 | |
| 126 | /* |
Dave Chinner | 4b680af | 2016-02-08 10:46:51 +1100 | [diff] [blame] | 127 | * Lock out modifications to both the RT bitmap and summary inodes |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 128 | */ |
Darrick J. Wong | f4a0660 | 2016-08-03 11:00:42 +1000 | [diff] [blame] | 129 | xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL|XFS_ILOCK_RTBITMAP); |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 130 | xfs_trans_ijoin(ap->tp, mp->m_rbmip, XFS_ILOCK_EXCL); |
Darrick J. Wong | f4a0660 | 2016-08-03 11:00:42 +1000 | [diff] [blame] | 131 | xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL|XFS_ILOCK_RTSUM); |
Dave Chinner | 4b680af | 2016-02-08 10:46:51 +1100 | [diff] [blame] | 132 | xfs_trans_ijoin(ap->tp, mp->m_rsumip, XFS_ILOCK_EXCL); |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 133 | |
| 134 | /* |
| 135 | * If it's an allocation to an empty file at offset 0, |
| 136 | * pick an extent that will space things out in the rt area. |
| 137 | */ |
| 138 | if (ap->eof && ap->offset == 0) { |
| 139 | xfs_rtblock_t uninitialized_var(rtx); /* realtime extent no */ |
| 140 | |
| 141 | error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx); |
| 142 | if (error) |
| 143 | return error; |
| 144 | ap->blkno = rtx * mp->m_sb.sb_rextsize; |
| 145 | } else { |
| 146 | ap->blkno = 0; |
| 147 | } |
| 148 | |
| 149 | xfs_bmap_adjacent(ap); |
| 150 | |
| 151 | /* |
| 152 | * Realtime allocation, done through xfs_rtallocate_extent. |
| 153 | */ |
| 154 | atype = ap->blkno == 0 ? XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO; |
| 155 | do_div(ap->blkno, mp->m_sb.sb_rextsize); |
| 156 | rtb = ap->blkno; |
| 157 | ap->length = ralen; |
| 158 | if ((error = xfs_rtallocate_extent(ap->tp, ap->blkno, 1, ap->length, |
| 159 | &ralen, atype, ap->wasdel, prod, &rtb))) |
| 160 | return error; |
| 161 | if (rtb == NULLFSBLOCK && prod > 1 && |
| 162 | (error = xfs_rtallocate_extent(ap->tp, ap->blkno, 1, |
| 163 | ap->length, &ralen, atype, |
| 164 | ap->wasdel, 1, &rtb))) |
| 165 | return error; |
| 166 | ap->blkno = rtb; |
| 167 | if (ap->blkno != NULLFSBLOCK) { |
| 168 | ap->blkno *= mp->m_sb.sb_rextsize; |
| 169 | ralen *= mp->m_sb.sb_rextsize; |
| 170 | ap->length = ralen; |
| 171 | ap->ip->i_d.di_nblocks += ralen; |
| 172 | xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE); |
| 173 | if (ap->wasdel) |
| 174 | ap->ip->i_delayed_blks -= ralen; |
| 175 | /* |
| 176 | * Adjust the disk quota also. This was reserved |
| 177 | * earlier. |
| 178 | */ |
| 179 | xfs_trans_mod_dquot_byino(ap->tp, ap->ip, |
| 180 | ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT : |
| 181 | XFS_TRANS_DQ_RTBCOUNT, (long) ralen); |
Dave Chinner | 3fbbbea | 2015-11-03 12:27:22 +1100 | [diff] [blame] | 182 | |
| 183 | /* Zero the extent if we were asked to do so */ |
| 184 | if (ap->userdata & XFS_ALLOC_USERDATA_ZERO) { |
| 185 | error = xfs_zero_extent(ap->ip, ap->blkno, ap->length); |
| 186 | if (error) |
| 187 | return error; |
| 188 | } |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 189 | } else { |
| 190 | ap->length = 0; |
| 191 | } |
| 192 | return 0; |
| 193 | } |
| 194 | |
| 195 | /* |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 196 | * Check if the endoff is outside the last extent. If so the caller will grow |
| 197 | * the allocation to a stripe unit boundary. All offsets are considered outside |
| 198 | * the end of file for an empty fork, so 1 is returned in *eof in that case. |
| 199 | */ |
| 200 | int |
| 201 | xfs_bmap_eof( |
| 202 | struct xfs_inode *ip, |
| 203 | xfs_fileoff_t endoff, |
| 204 | int whichfork, |
| 205 | int *eof) |
| 206 | { |
| 207 | struct xfs_bmbt_irec rec; |
| 208 | int error; |
| 209 | |
| 210 | error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, eof); |
| 211 | if (error || *eof) |
| 212 | return error; |
| 213 | |
| 214 | *eof = endoff >= rec.br_startoff + rec.br_blockcount; |
| 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | /* |
| 219 | * Extent tree block counting routines. |
| 220 | */ |
| 221 | |
| 222 | /* |
| 223 | * Count leaf blocks given a range of extent records. |
| 224 | */ |
| 225 | STATIC void |
| 226 | xfs_bmap_count_leaves( |
| 227 | xfs_ifork_t *ifp, |
| 228 | xfs_extnum_t idx, |
| 229 | int numrecs, |
| 230 | int *count) |
| 231 | { |
| 232 | int b; |
| 233 | |
| 234 | for (b = 0; b < numrecs; b++) { |
| 235 | xfs_bmbt_rec_host_t *frp = xfs_iext_get_ext(ifp, idx + b); |
| 236 | *count += xfs_bmbt_get_blockcount(frp); |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | /* |
| 241 | * Count leaf blocks given a range of extent records originally |
| 242 | * in btree format. |
| 243 | */ |
| 244 | STATIC void |
| 245 | xfs_bmap_disk_count_leaves( |
| 246 | struct xfs_mount *mp, |
| 247 | struct xfs_btree_block *block, |
| 248 | int numrecs, |
| 249 | int *count) |
| 250 | { |
| 251 | int b; |
| 252 | xfs_bmbt_rec_t *frp; |
| 253 | |
| 254 | for (b = 1; b <= numrecs; b++) { |
| 255 | frp = XFS_BMBT_REC_ADDR(mp, block, b); |
| 256 | *count += xfs_bmbt_disk_get_blockcount(frp); |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | /* |
| 261 | * Recursively walks each level of a btree |
Zhi Yong Wu | 8be11e9 | 2013-08-12 03:14:52 +0000 | [diff] [blame] | 262 | * to count total fsblocks in use. |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 263 | */ |
| 264 | STATIC int /* error */ |
| 265 | xfs_bmap_count_tree( |
| 266 | xfs_mount_t *mp, /* file system mount point */ |
| 267 | xfs_trans_t *tp, /* transaction pointer */ |
| 268 | xfs_ifork_t *ifp, /* inode fork pointer */ |
| 269 | xfs_fsblock_t blockno, /* file system block number */ |
| 270 | int levelin, /* level in btree */ |
| 271 | int *count) /* Count of blocks */ |
| 272 | { |
| 273 | int error; |
| 274 | xfs_buf_t *bp, *nbp; |
| 275 | int level = levelin; |
| 276 | __be64 *pp; |
| 277 | xfs_fsblock_t bno = blockno; |
| 278 | xfs_fsblock_t nextbno; |
| 279 | struct xfs_btree_block *block, *nextblock; |
| 280 | int numrecs; |
| 281 | |
| 282 | error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, XFS_BMAP_BTREE_REF, |
| 283 | &xfs_bmbt_buf_ops); |
| 284 | if (error) |
| 285 | return error; |
| 286 | *count += 1; |
| 287 | block = XFS_BUF_TO_BLOCK(bp); |
| 288 | |
| 289 | if (--level) { |
| 290 | /* Not at node above leaves, count this level of nodes */ |
| 291 | nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib); |
| 292 | while (nextbno != NULLFSBLOCK) { |
| 293 | error = xfs_btree_read_bufl(mp, tp, nextbno, 0, &nbp, |
| 294 | XFS_BMAP_BTREE_REF, |
| 295 | &xfs_bmbt_buf_ops); |
| 296 | if (error) |
| 297 | return error; |
| 298 | *count += 1; |
| 299 | nextblock = XFS_BUF_TO_BLOCK(nbp); |
| 300 | nextbno = be64_to_cpu(nextblock->bb_u.l.bb_rightsib); |
| 301 | xfs_trans_brelse(tp, nbp); |
| 302 | } |
| 303 | |
| 304 | /* Dive to the next level */ |
| 305 | pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]); |
| 306 | bno = be64_to_cpu(*pp); |
| 307 | if (unlikely((error = |
| 308 | xfs_bmap_count_tree(mp, tp, ifp, bno, level, count)) < 0)) { |
| 309 | xfs_trans_brelse(tp, bp); |
| 310 | XFS_ERROR_REPORT("xfs_bmap_count_tree(1)", |
| 311 | XFS_ERRLEVEL_LOW, mp); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 312 | return -EFSCORRUPTED; |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 313 | } |
| 314 | xfs_trans_brelse(tp, bp); |
| 315 | } else { |
| 316 | /* count all level 1 nodes and their leaves */ |
| 317 | for (;;) { |
| 318 | nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib); |
| 319 | numrecs = be16_to_cpu(block->bb_numrecs); |
| 320 | xfs_bmap_disk_count_leaves(mp, block, numrecs, count); |
| 321 | xfs_trans_brelse(tp, bp); |
| 322 | if (nextbno == NULLFSBLOCK) |
| 323 | break; |
| 324 | bno = nextbno; |
| 325 | error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, |
| 326 | XFS_BMAP_BTREE_REF, |
| 327 | &xfs_bmbt_buf_ops); |
| 328 | if (error) |
| 329 | return error; |
| 330 | *count += 1; |
| 331 | block = XFS_BUF_TO_BLOCK(bp); |
| 332 | } |
| 333 | } |
| 334 | return 0; |
| 335 | } |
| 336 | |
| 337 | /* |
| 338 | * Count fsblocks of the given fork. |
| 339 | */ |
Eric Sandeen | 0d5a75e | 2016-06-01 17:38:15 +1000 | [diff] [blame] | 340 | static int /* error */ |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 341 | xfs_bmap_count_blocks( |
| 342 | xfs_trans_t *tp, /* transaction pointer */ |
| 343 | xfs_inode_t *ip, /* incore inode */ |
| 344 | int whichfork, /* data or attr fork */ |
| 345 | int *count) /* out: count of blocks */ |
| 346 | { |
| 347 | struct xfs_btree_block *block; /* current btree block */ |
| 348 | xfs_fsblock_t bno; /* block # of "block" */ |
| 349 | xfs_ifork_t *ifp; /* fork structure */ |
| 350 | int level; /* btree level, for checking */ |
| 351 | xfs_mount_t *mp; /* file system mount structure */ |
| 352 | __be64 *pp; /* pointer to block address */ |
| 353 | |
| 354 | bno = NULLFSBLOCK; |
| 355 | mp = ip->i_mount; |
| 356 | ifp = XFS_IFORK_PTR(ip, whichfork); |
| 357 | if ( XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ) { |
| 358 | xfs_bmap_count_leaves(ifp, 0, |
| 359 | ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t), |
| 360 | count); |
| 361 | return 0; |
| 362 | } |
| 363 | |
| 364 | /* |
| 365 | * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out. |
| 366 | */ |
| 367 | block = ifp->if_broot; |
| 368 | level = be16_to_cpu(block->bb_level); |
| 369 | ASSERT(level > 0); |
| 370 | pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes); |
| 371 | bno = be64_to_cpu(*pp); |
Christoph Hellwig | d5cf09b | 2014-07-30 09:12:05 +1000 | [diff] [blame] | 372 | ASSERT(bno != NULLFSBLOCK); |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 373 | ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount); |
| 374 | ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks); |
| 375 | |
| 376 | if (unlikely(xfs_bmap_count_tree(mp, tp, ifp, bno, level, count) < 0)) { |
| 377 | XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW, |
| 378 | mp); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 379 | return -EFSCORRUPTED; |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 380 | } |
| 381 | |
| 382 | return 0; |
| 383 | } |
| 384 | |
| 385 | /* |
| 386 | * returns 1 for success, 0 if we failed to map the extent. |
| 387 | */ |
| 388 | STATIC int |
| 389 | xfs_getbmapx_fix_eof_hole( |
| 390 | xfs_inode_t *ip, /* xfs incore inode pointer */ |
| 391 | struct getbmapx *out, /* output structure */ |
| 392 | int prealloced, /* this is a file with |
| 393 | * preallocated data space */ |
| 394 | __int64_t end, /* last block requested */ |
| 395 | xfs_fsblock_t startblock) |
| 396 | { |
| 397 | __int64_t fixlen; |
| 398 | xfs_mount_t *mp; /* file system mount point */ |
| 399 | xfs_ifork_t *ifp; /* inode fork pointer */ |
| 400 | xfs_extnum_t lastx; /* last extent pointer */ |
| 401 | xfs_fileoff_t fileblock; |
| 402 | |
| 403 | if (startblock == HOLESTARTBLOCK) { |
| 404 | mp = ip->i_mount; |
| 405 | out->bmv_block = -1; |
| 406 | fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, XFS_ISIZE(ip))); |
| 407 | fixlen -= out->bmv_offset; |
| 408 | if (prealloced && out->bmv_offset + out->bmv_length == end) { |
| 409 | /* Came to hole at EOF. Trim it. */ |
| 410 | if (fixlen <= 0) |
| 411 | return 0; |
| 412 | out->bmv_length = fixlen; |
| 413 | } |
| 414 | } else { |
| 415 | if (startblock == DELAYSTARTBLOCK) |
| 416 | out->bmv_block = -2; |
| 417 | else |
| 418 | out->bmv_block = xfs_fsb_to_db(ip, startblock); |
| 419 | fileblock = XFS_BB_TO_FSB(ip->i_mount, out->bmv_offset); |
| 420 | ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK); |
| 421 | if (xfs_iext_bno_to_ext(ifp, fileblock, &lastx) && |
| 422 | (lastx == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))-1)) |
| 423 | out->bmv_oflags |= BMV_OF_LAST; |
| 424 | } |
| 425 | |
| 426 | return 1; |
| 427 | } |
| 428 | |
| 429 | /* |
| 430 | * Get inode's extents as described in bmv, and format for output. |
| 431 | * Calls formatter to fill the user's buffer until all extents |
| 432 | * are mapped, until the passed-in bmv->bmv_count slots have |
| 433 | * been filled, or until the formatter short-circuits the loop, |
| 434 | * if it is tracking filled-in extents on its own. |
| 435 | */ |
| 436 | int /* error code */ |
| 437 | xfs_getbmap( |
| 438 | xfs_inode_t *ip, |
| 439 | struct getbmapx *bmv, /* user bmap structure */ |
| 440 | xfs_bmap_format_t formatter, /* format to user */ |
| 441 | void *arg) /* formatter arg */ |
| 442 | { |
| 443 | __int64_t bmvend; /* last block requested */ |
| 444 | int error = 0; /* return value */ |
| 445 | __int64_t fixlen; /* length for -1 case */ |
| 446 | int i; /* extent number */ |
| 447 | int lock; /* lock state */ |
| 448 | xfs_bmbt_irec_t *map; /* buffer for user's data */ |
| 449 | xfs_mount_t *mp; /* file system mount point */ |
| 450 | int nex; /* # of user extents can do */ |
| 451 | int nexleft; /* # of user extents left */ |
| 452 | int subnex; /* # of bmapi's can do */ |
| 453 | int nmap; /* number of map entries */ |
| 454 | struct getbmapx *out; /* output structure */ |
| 455 | int whichfork; /* data or attr fork */ |
| 456 | int prealloced; /* this is a file with |
| 457 | * preallocated data space */ |
| 458 | int iflags; /* interface flags */ |
| 459 | int bmapi_flags; /* flags for xfs_bmapi */ |
| 460 | int cur_ext = 0; |
| 461 | |
| 462 | mp = ip->i_mount; |
| 463 | iflags = bmv->bmv_iflags; |
| 464 | whichfork = iflags & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK; |
| 465 | |
| 466 | if (whichfork == XFS_ATTR_FORK) { |
| 467 | if (XFS_IFORK_Q(ip)) { |
| 468 | if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS && |
| 469 | ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE && |
| 470 | ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 471 | return -EINVAL; |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 472 | } else if (unlikely( |
| 473 | ip->i_d.di_aformat != 0 && |
| 474 | ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS)) { |
| 475 | XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW, |
| 476 | ip->i_mount); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 477 | return -EFSCORRUPTED; |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 478 | } |
| 479 | |
| 480 | prealloced = 0; |
| 481 | fixlen = 1LL << 32; |
| 482 | } else { |
| 483 | if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS && |
| 484 | ip->i_d.di_format != XFS_DINODE_FMT_BTREE && |
| 485 | ip->i_d.di_format != XFS_DINODE_FMT_LOCAL) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 486 | return -EINVAL; |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 487 | |
| 488 | if (xfs_get_extsz_hint(ip) || |
| 489 | ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)){ |
| 490 | prealloced = 1; |
| 491 | fixlen = mp->m_super->s_maxbytes; |
| 492 | } else { |
| 493 | prealloced = 0; |
| 494 | fixlen = XFS_ISIZE(ip); |
| 495 | } |
| 496 | } |
| 497 | |
| 498 | if (bmv->bmv_length == -1) { |
| 499 | fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, fixlen)); |
| 500 | bmv->bmv_length = |
| 501 | max_t(__int64_t, fixlen - bmv->bmv_offset, 0); |
| 502 | } else if (bmv->bmv_length == 0) { |
| 503 | bmv->bmv_entries = 0; |
| 504 | return 0; |
| 505 | } else if (bmv->bmv_length < 0) { |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 506 | return -EINVAL; |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 507 | } |
| 508 | |
| 509 | nex = bmv->bmv_count - 1; |
| 510 | if (nex <= 0) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 511 | return -EINVAL; |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 512 | bmvend = bmv->bmv_offset + bmv->bmv_length; |
| 513 | |
| 514 | |
| 515 | if (bmv->bmv_count > ULONG_MAX / sizeof(struct getbmapx)) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 516 | return -ENOMEM; |
Dave Chinner | fdd3cce | 2013-09-02 20:53:00 +1000 | [diff] [blame] | 517 | out = kmem_zalloc_large(bmv->bmv_count * sizeof(struct getbmapx), 0); |
| 518 | if (!out) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 519 | return -ENOMEM; |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 520 | |
| 521 | xfs_ilock(ip, XFS_IOLOCK_SHARED); |
Christoph Hellwig | efa70be | 2013-12-18 02:14:39 -0800 | [diff] [blame] | 522 | if (whichfork == XFS_DATA_FORK) { |
| 523 | if (!(iflags & BMV_IF_DELALLOC) && |
| 524 | (ip->i_delayed_blks || XFS_ISIZE(ip) > ip->i_d.di_size)) { |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 525 | error = filemap_write_and_wait(VFS_I(ip)->i_mapping); |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 526 | if (error) |
| 527 | goto out_unlock_iolock; |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 528 | |
Christoph Hellwig | efa70be | 2013-12-18 02:14:39 -0800 | [diff] [blame] | 529 | /* |
| 530 | * Even after flushing the inode, there can still be |
| 531 | * delalloc blocks on the inode beyond EOF due to |
| 532 | * speculative preallocation. These are not removed |
| 533 | * until the release function is called or the inode |
| 534 | * is inactivated. Hence we cannot assert here that |
| 535 | * ip->i_delayed_blks == 0. |
| 536 | */ |
| 537 | } |
| 538 | |
| 539 | lock = xfs_ilock_data_map_shared(ip); |
| 540 | } else { |
| 541 | lock = xfs_ilock_attr_map_shared(ip); |
| 542 | } |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 543 | |
| 544 | /* |
| 545 | * Don't let nex be bigger than the number of extents |
| 546 | * we can have assuming alternating holes and real extents. |
| 547 | */ |
| 548 | if (nex > XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1) |
| 549 | nex = XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1; |
| 550 | |
| 551 | bmapi_flags = xfs_bmapi_aflag(whichfork); |
| 552 | if (!(iflags & BMV_IF_PREALLOC)) |
| 553 | bmapi_flags |= XFS_BMAPI_IGSTATE; |
| 554 | |
| 555 | /* |
| 556 | * Allocate enough space to handle "subnex" maps at a time. |
| 557 | */ |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 558 | error = -ENOMEM; |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 559 | subnex = 16; |
| 560 | map = kmem_alloc(subnex * sizeof(*map), KM_MAYFAIL | KM_NOFS); |
| 561 | if (!map) |
| 562 | goto out_unlock_ilock; |
| 563 | |
| 564 | bmv->bmv_entries = 0; |
| 565 | |
| 566 | if (XFS_IFORK_NEXTENTS(ip, whichfork) == 0 && |
| 567 | (whichfork == XFS_ATTR_FORK || !(iflags & BMV_IF_DELALLOC))) { |
| 568 | error = 0; |
| 569 | goto out_free_map; |
| 570 | } |
| 571 | |
| 572 | nexleft = nex; |
| 573 | |
| 574 | do { |
| 575 | nmap = (nexleft > subnex) ? subnex : nexleft; |
| 576 | error = xfs_bmapi_read(ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset), |
| 577 | XFS_BB_TO_FSB(mp, bmv->bmv_length), |
| 578 | map, &nmap, bmapi_flags); |
| 579 | if (error) |
| 580 | goto out_free_map; |
| 581 | ASSERT(nmap <= subnex); |
| 582 | |
| 583 | for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) { |
| 584 | out[cur_ext].bmv_oflags = 0; |
| 585 | if (map[i].br_state == XFS_EXT_UNWRITTEN) |
| 586 | out[cur_ext].bmv_oflags |= BMV_OF_PREALLOC; |
| 587 | else if (map[i].br_startblock == DELAYSTARTBLOCK) |
| 588 | out[cur_ext].bmv_oflags |= BMV_OF_DELALLOC; |
| 589 | out[cur_ext].bmv_offset = |
| 590 | XFS_FSB_TO_BB(mp, map[i].br_startoff); |
| 591 | out[cur_ext].bmv_length = |
| 592 | XFS_FSB_TO_BB(mp, map[i].br_blockcount); |
| 593 | out[cur_ext].bmv_unused1 = 0; |
| 594 | out[cur_ext].bmv_unused2 = 0; |
| 595 | |
| 596 | /* |
| 597 | * delayed allocation extents that start beyond EOF can |
| 598 | * occur due to speculative EOF allocation when the |
| 599 | * delalloc extent is larger than the largest freespace |
| 600 | * extent at conversion time. These extents cannot be |
| 601 | * converted by data writeback, so can exist here even |
| 602 | * if we are not supposed to be finding delalloc |
| 603 | * extents. |
| 604 | */ |
| 605 | if (map[i].br_startblock == DELAYSTARTBLOCK && |
| 606 | map[i].br_startoff <= XFS_B_TO_FSB(mp, XFS_ISIZE(ip))) |
| 607 | ASSERT((iflags & BMV_IF_DELALLOC) != 0); |
| 608 | |
| 609 | if (map[i].br_startblock == HOLESTARTBLOCK && |
| 610 | whichfork == XFS_ATTR_FORK) { |
| 611 | /* came to the end of attribute fork */ |
| 612 | out[cur_ext].bmv_oflags |= BMV_OF_LAST; |
| 613 | goto out_free_map; |
| 614 | } |
| 615 | |
| 616 | if (!xfs_getbmapx_fix_eof_hole(ip, &out[cur_ext], |
| 617 | prealloced, bmvend, |
| 618 | map[i].br_startblock)) |
| 619 | goto out_free_map; |
| 620 | |
| 621 | bmv->bmv_offset = |
| 622 | out[cur_ext].bmv_offset + |
| 623 | out[cur_ext].bmv_length; |
| 624 | bmv->bmv_length = |
| 625 | max_t(__int64_t, 0, bmvend - bmv->bmv_offset); |
| 626 | |
| 627 | /* |
| 628 | * In case we don't want to return the hole, |
| 629 | * don't increase cur_ext so that we can reuse |
| 630 | * it in the next loop. |
| 631 | */ |
| 632 | if ((iflags & BMV_IF_NO_HOLES) && |
| 633 | map[i].br_startblock == HOLESTARTBLOCK) { |
| 634 | memset(&out[cur_ext], 0, sizeof(out[cur_ext])); |
| 635 | continue; |
| 636 | } |
| 637 | |
| 638 | nexleft--; |
| 639 | bmv->bmv_entries++; |
| 640 | cur_ext++; |
| 641 | } |
| 642 | } while (nmap && nexleft && bmv->bmv_length); |
| 643 | |
| 644 | out_free_map: |
| 645 | kmem_free(map); |
| 646 | out_unlock_ilock: |
Christoph Hellwig | 01f4f32 | 2013-12-06 12:30:08 -0800 | [diff] [blame] | 647 | xfs_iunlock(ip, lock); |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 648 | out_unlock_iolock: |
| 649 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); |
| 650 | |
| 651 | for (i = 0; i < cur_ext; i++) { |
| 652 | int full = 0; /* user array is full */ |
| 653 | |
| 654 | /* format results & advance arg */ |
| 655 | error = formatter(&arg, &out[i], &full); |
| 656 | if (error || full) |
| 657 | break; |
| 658 | } |
| 659 | |
Dave Chinner | fdd3cce | 2013-09-02 20:53:00 +1000 | [diff] [blame] | 660 | kmem_free(out); |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 661 | return error; |
| 662 | } |
| 663 | |
| 664 | /* |
| 665 | * dead simple method of punching delalyed allocation blocks from a range in |
| 666 | * the inode. Walks a block at a time so will be slow, but is only executed in |
Zhi Yong Wu | ad4809b | 2013-08-12 03:14:55 +0000 | [diff] [blame] | 667 | * rare error cases so the overhead is not critical. This will always punch out |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 668 | * both the start and end blocks, even if the ranges only partially overlap |
| 669 | * them, so it is up to the caller to ensure that partial blocks are not |
| 670 | * passed in. |
| 671 | */ |
| 672 | int |
| 673 | xfs_bmap_punch_delalloc_range( |
| 674 | struct xfs_inode *ip, |
| 675 | xfs_fileoff_t start_fsb, |
| 676 | xfs_fileoff_t length) |
| 677 | { |
| 678 | xfs_fileoff_t remaining = length; |
| 679 | int error = 0; |
| 680 | |
| 681 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
| 682 | |
| 683 | do { |
| 684 | int done; |
| 685 | xfs_bmbt_irec_t imap; |
| 686 | int nimaps = 1; |
| 687 | xfs_fsblock_t firstblock; |
| 688 | xfs_bmap_free_t flist; |
| 689 | |
| 690 | /* |
| 691 | * Map the range first and check that it is a delalloc extent |
| 692 | * before trying to unmap the range. Otherwise we will be |
| 693 | * trying to remove a real extent (which requires a |
| 694 | * transaction) or a hole, which is probably a bad idea... |
| 695 | */ |
| 696 | error = xfs_bmapi_read(ip, start_fsb, 1, &imap, &nimaps, |
| 697 | XFS_BMAPI_ENTIRE); |
| 698 | |
| 699 | if (error) { |
| 700 | /* something screwed, just bail */ |
| 701 | if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { |
| 702 | xfs_alert(ip->i_mount, |
| 703 | "Failed delalloc mapping lookup ino %lld fsb %lld.", |
| 704 | ip->i_ino, start_fsb); |
| 705 | } |
| 706 | break; |
| 707 | } |
| 708 | if (!nimaps) { |
| 709 | /* nothing there */ |
| 710 | goto next_block; |
| 711 | } |
| 712 | if (imap.br_startblock != DELAYSTARTBLOCK) { |
| 713 | /* been converted, ignore */ |
| 714 | goto next_block; |
| 715 | } |
| 716 | WARN_ON(imap.br_blockcount == 0); |
| 717 | |
| 718 | /* |
| 719 | * Note: while we initialise the firstblock/flist pair, they |
| 720 | * should never be used because blocks should never be |
| 721 | * allocated or freed for a delalloc extent and hence we need |
| 722 | * don't cancel or finish them after the xfs_bunmapi() call. |
| 723 | */ |
| 724 | xfs_bmap_init(&flist, &firstblock); |
| 725 | error = xfs_bunmapi(NULL, ip, start_fsb, 1, 0, 1, &firstblock, |
| 726 | &flist, &done); |
| 727 | if (error) |
| 728 | break; |
| 729 | |
Darrick J. Wong | 3ab78df | 2016-08-03 11:15:38 +1000 | [diff] [blame^] | 730 | ASSERT(!xfs_defer_has_unfinished_work(&flist)); |
Dave Chinner | 6898811 | 2013-08-12 20:49:42 +1000 | [diff] [blame] | 731 | next_block: |
| 732 | start_fsb++; |
| 733 | remaining--; |
| 734 | } while(remaining > 0); |
| 735 | |
| 736 | return error; |
| 737 | } |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 738 | |
| 739 | /* |
| 740 | * Test whether it is appropriate to check an inode for and free post EOF |
| 741 | * blocks. The 'force' parameter determines whether we should also consider |
| 742 | * regular files that are marked preallocated or append-only. |
| 743 | */ |
| 744 | bool |
| 745 | xfs_can_free_eofblocks(struct xfs_inode *ip, bool force) |
| 746 | { |
| 747 | /* prealloc/delalloc exists only on regular files */ |
Dave Chinner | c19b3b05 | 2016-02-09 16:54:58 +1100 | [diff] [blame] | 748 | if (!S_ISREG(VFS_I(ip)->i_mode)) |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 749 | return false; |
| 750 | |
| 751 | /* |
| 752 | * Zero sized files with no cached pages and delalloc blocks will not |
| 753 | * have speculative prealloc/delalloc blocks to remove. |
| 754 | */ |
| 755 | if (VFS_I(ip)->i_size == 0 && |
Dave Chinner | 2667c6f | 2014-08-04 13:23:15 +1000 | [diff] [blame] | 756 | VFS_I(ip)->i_mapping->nrpages == 0 && |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 757 | ip->i_delayed_blks == 0) |
| 758 | return false; |
| 759 | |
| 760 | /* If we haven't read in the extent list, then don't do it now. */ |
| 761 | if (!(ip->i_df.if_flags & XFS_IFEXTENTS)) |
| 762 | return false; |
| 763 | |
| 764 | /* |
| 765 | * Do not free real preallocated or append-only files unless the file |
| 766 | * has delalloc blocks and we are forced to remove them. |
| 767 | */ |
| 768 | if (ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) |
| 769 | if (!force || ip->i_delayed_blks == 0) |
| 770 | return false; |
| 771 | |
| 772 | return true; |
| 773 | } |
| 774 | |
| 775 | /* |
| 776 | * This is called by xfs_inactive to free any blocks beyond eof |
| 777 | * when the link count isn't zero and by xfs_dm_punch_hole() when |
| 778 | * punching a hole to EOF. |
| 779 | */ |
| 780 | int |
| 781 | xfs_free_eofblocks( |
| 782 | xfs_mount_t *mp, |
| 783 | xfs_inode_t *ip, |
| 784 | bool need_iolock) |
| 785 | { |
| 786 | xfs_trans_t *tp; |
| 787 | int error; |
| 788 | xfs_fileoff_t end_fsb; |
| 789 | xfs_fileoff_t last_fsb; |
| 790 | xfs_filblks_t map_len; |
| 791 | int nimaps; |
| 792 | xfs_bmbt_irec_t imap; |
| 793 | |
| 794 | /* |
| 795 | * Figure out if there are any blocks beyond the end |
| 796 | * of the file. If not, then there is nothing to do. |
| 797 | */ |
| 798 | end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_ISIZE(ip)); |
| 799 | last_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes); |
| 800 | if (last_fsb <= end_fsb) |
| 801 | return 0; |
| 802 | map_len = last_fsb - end_fsb; |
| 803 | |
| 804 | nimaps = 1; |
| 805 | xfs_ilock(ip, XFS_ILOCK_SHARED); |
| 806 | error = xfs_bmapi_read(ip, end_fsb, map_len, &imap, &nimaps, 0); |
| 807 | xfs_iunlock(ip, XFS_ILOCK_SHARED); |
| 808 | |
| 809 | if (!error && (nimaps != 0) && |
| 810 | (imap.br_startblock != HOLESTARTBLOCK || |
| 811 | ip->i_delayed_blks)) { |
| 812 | /* |
| 813 | * Attach the dquots to the inode up front. |
| 814 | */ |
| 815 | error = xfs_qm_dqattach(ip, 0); |
| 816 | if (error) |
| 817 | return error; |
| 818 | |
| 819 | /* |
| 820 | * There are blocks after the end of file. |
| 821 | * Free them up now by truncating the file to |
| 822 | * its current size. |
| 823 | */ |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 824 | if (need_iolock) { |
Christoph Hellwig | 253f491 | 2016-04-06 09:19:55 +1000 | [diff] [blame] | 825 | if (!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 826 | return -EAGAIN; |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 827 | } |
| 828 | |
Christoph Hellwig | 253f491 | 2016-04-06 09:19:55 +1000 | [diff] [blame] | 829 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, |
| 830 | &tp); |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 831 | if (error) { |
| 832 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 833 | if (need_iolock) |
| 834 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); |
| 835 | return error; |
| 836 | } |
| 837 | |
| 838 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
| 839 | xfs_trans_ijoin(tp, ip, 0); |
| 840 | |
| 841 | /* |
| 842 | * Do not update the on-disk file size. If we update the |
| 843 | * on-disk file size and then the system crashes before the |
| 844 | * contents of the file are flushed to disk then the files |
| 845 | * may be full of holes (ie NULL files bug). |
| 846 | */ |
| 847 | error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, |
| 848 | XFS_ISIZE(ip)); |
| 849 | if (error) { |
| 850 | /* |
| 851 | * If we get an error at this point we simply don't |
| 852 | * bother truncating the file. |
| 853 | */ |
Christoph Hellwig | 4906e21 | 2015-06-04 13:47:56 +1000 | [diff] [blame] | 854 | xfs_trans_cancel(tp); |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 855 | } else { |
Christoph Hellwig | 7039331 | 2015-06-04 13:48:08 +1000 | [diff] [blame] | 856 | error = xfs_trans_commit(tp); |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 857 | if (!error) |
| 858 | xfs_inode_clear_eofblocks_tag(ip); |
| 859 | } |
| 860 | |
| 861 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| 862 | if (need_iolock) |
| 863 | xfs_iunlock(ip, XFS_IOLOCK_EXCL); |
| 864 | } |
| 865 | return error; |
| 866 | } |
| 867 | |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 868 | int |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 869 | xfs_alloc_file_space( |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 870 | struct xfs_inode *ip, |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 871 | xfs_off_t offset, |
| 872 | xfs_off_t len, |
Christoph Hellwig | 5f8aca8 | 2013-10-12 00:55:06 -0700 | [diff] [blame] | 873 | int alloc_type) |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 874 | { |
| 875 | xfs_mount_t *mp = ip->i_mount; |
| 876 | xfs_off_t count; |
| 877 | xfs_filblks_t allocated_fsb; |
| 878 | xfs_filblks_t allocatesize_fsb; |
| 879 | xfs_extlen_t extsz, temp; |
| 880 | xfs_fileoff_t startoffset_fsb; |
| 881 | xfs_fsblock_t firstfsb; |
| 882 | int nimaps; |
| 883 | int quota_flag; |
| 884 | int rt; |
| 885 | xfs_trans_t *tp; |
| 886 | xfs_bmbt_irec_t imaps[1], *imapp; |
| 887 | xfs_bmap_free_t free_list; |
| 888 | uint qblocks, resblks, resrtextents; |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 889 | int error; |
| 890 | |
| 891 | trace_xfs_alloc_file_space(ip); |
| 892 | |
| 893 | if (XFS_FORCED_SHUTDOWN(mp)) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 894 | return -EIO; |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 895 | |
| 896 | error = xfs_qm_dqattach(ip, 0); |
| 897 | if (error) |
| 898 | return error; |
| 899 | |
| 900 | if (len <= 0) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 901 | return -EINVAL; |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 902 | |
| 903 | rt = XFS_IS_REALTIME_INODE(ip); |
| 904 | extsz = xfs_get_extsz_hint(ip); |
| 905 | |
| 906 | count = len; |
| 907 | imapp = &imaps[0]; |
| 908 | nimaps = 1; |
| 909 | startoffset_fsb = XFS_B_TO_FSBT(mp, offset); |
| 910 | allocatesize_fsb = XFS_B_TO_FSB(mp, count); |
| 911 | |
| 912 | /* |
| 913 | * Allocate file space until done or until there is an error |
| 914 | */ |
| 915 | while (allocatesize_fsb && !error) { |
| 916 | xfs_fileoff_t s, e; |
| 917 | |
| 918 | /* |
| 919 | * Determine space reservations for data/realtime. |
| 920 | */ |
| 921 | if (unlikely(extsz)) { |
| 922 | s = startoffset_fsb; |
| 923 | do_div(s, extsz); |
| 924 | s *= extsz; |
| 925 | e = startoffset_fsb + allocatesize_fsb; |
| 926 | if ((temp = do_mod(startoffset_fsb, extsz))) |
| 927 | e += temp; |
| 928 | if ((temp = do_mod(e, extsz))) |
| 929 | e += extsz - temp; |
| 930 | } else { |
| 931 | s = 0; |
| 932 | e = allocatesize_fsb; |
| 933 | } |
| 934 | |
| 935 | /* |
| 936 | * The transaction reservation is limited to a 32-bit block |
| 937 | * count, hence we need to limit the number of blocks we are |
| 938 | * trying to reserve to avoid an overflow. We can't allocate |
| 939 | * more than @nimaps extents, and an extent is limited on disk |
| 940 | * to MAXEXTLEN (21 bits), so use that to enforce the limit. |
| 941 | */ |
| 942 | resblks = min_t(xfs_fileoff_t, (e - s), (MAXEXTLEN * nimaps)); |
| 943 | if (unlikely(rt)) { |
| 944 | resrtextents = qblocks = resblks; |
| 945 | resrtextents /= mp->m_sb.sb_rextsize; |
| 946 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); |
| 947 | quota_flag = XFS_QMOPT_RES_RTBLKS; |
| 948 | } else { |
| 949 | resrtextents = 0; |
| 950 | resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resblks); |
| 951 | quota_flag = XFS_QMOPT_RES_REGBLKS; |
| 952 | } |
| 953 | |
| 954 | /* |
| 955 | * Allocate and setup the transaction. |
| 956 | */ |
Christoph Hellwig | 253f491 | 2016-04-06 09:19:55 +1000 | [diff] [blame] | 957 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, |
| 958 | resrtextents, 0, &tp); |
| 959 | |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 960 | /* |
| 961 | * Check for running out of space |
| 962 | */ |
| 963 | if (error) { |
| 964 | /* |
| 965 | * Free the transaction structure. |
| 966 | */ |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 967 | ASSERT(error == -ENOSPC || XFS_FORCED_SHUTDOWN(mp)); |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 968 | break; |
| 969 | } |
| 970 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
| 971 | error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks, |
| 972 | 0, quota_flag); |
| 973 | if (error) |
| 974 | goto error1; |
| 975 | |
| 976 | xfs_trans_ijoin(tp, ip, 0); |
| 977 | |
| 978 | xfs_bmap_init(&free_list, &firstfsb); |
| 979 | error = xfs_bmapi_write(tp, ip, startoffset_fsb, |
| 980 | allocatesize_fsb, alloc_type, &firstfsb, |
Brian Foster | dbd5c8c | 2015-10-12 16:04:13 +1100 | [diff] [blame] | 981 | resblks, imapp, &nimaps, &free_list); |
Eric Sandeen | f6106ef | 2016-01-11 11:34:01 +1100 | [diff] [blame] | 982 | if (error) |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 983 | goto error0; |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 984 | |
| 985 | /* |
| 986 | * Complete the transaction |
| 987 | */ |
Eric Sandeen | f6106ef | 2016-01-11 11:34:01 +1100 | [diff] [blame] | 988 | error = xfs_bmap_finish(&tp, &free_list, NULL); |
| 989 | if (error) |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 990 | goto error0; |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 991 | |
Christoph Hellwig | 7039331 | 2015-06-04 13:48:08 +1000 | [diff] [blame] | 992 | error = xfs_trans_commit(tp); |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 993 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
Eric Sandeen | f6106ef | 2016-01-11 11:34:01 +1100 | [diff] [blame] | 994 | if (error) |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 995 | break; |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 996 | |
| 997 | allocated_fsb = imapp->br_blockcount; |
| 998 | |
| 999 | if (nimaps == 0) { |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1000 | error = -ENOSPC; |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1001 | break; |
| 1002 | } |
| 1003 | |
| 1004 | startoffset_fsb += allocated_fsb; |
| 1005 | allocatesize_fsb -= allocated_fsb; |
| 1006 | } |
| 1007 | |
| 1008 | return error; |
| 1009 | |
| 1010 | error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */ |
| 1011 | xfs_bmap_cancel(&free_list); |
| 1012 | xfs_trans_unreserve_quota_nblks(tp, ip, (long)qblocks, 0, quota_flag); |
| 1013 | |
| 1014 | error1: /* Just cancel transaction */ |
Christoph Hellwig | 4906e21 | 2015-06-04 13:47:56 +1000 | [diff] [blame] | 1015 | xfs_trans_cancel(tp); |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1016 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| 1017 | return error; |
| 1018 | } |
| 1019 | |
Christoph Hellwig | bdb0d04 | 2016-06-21 10:00:55 +1000 | [diff] [blame] | 1020 | static int |
| 1021 | xfs_unmap_extent( |
| 1022 | struct xfs_inode *ip, |
| 1023 | xfs_fileoff_t startoffset_fsb, |
| 1024 | xfs_filblks_t len_fsb, |
| 1025 | int *done) |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1026 | { |
Christoph Hellwig | bdb0d04 | 2016-06-21 10:00:55 +1000 | [diff] [blame] | 1027 | struct xfs_mount *mp = ip->i_mount; |
| 1028 | struct xfs_trans *tp; |
| 1029 | struct xfs_bmap_free free_list; |
| 1030 | xfs_fsblock_t firstfsb; |
| 1031 | uint resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); |
| 1032 | int error; |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1033 | |
Christoph Hellwig | bdb0d04 | 2016-06-21 10:00:55 +1000 | [diff] [blame] | 1034 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, 0, &tp); |
| 1035 | if (error) { |
| 1036 | ASSERT(error == -ENOSPC || XFS_FORCED_SHUTDOWN(mp)); |
| 1037 | return error; |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1038 | } |
Christoph Hellwig | bdb0d04 | 2016-06-21 10:00:55 +1000 | [diff] [blame] | 1039 | |
| 1040 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
| 1041 | error = xfs_trans_reserve_quota(tp, mp, ip->i_udquot, ip->i_gdquot, |
| 1042 | ip->i_pdquot, resblks, 0, XFS_QMOPT_RES_REGBLKS); |
| 1043 | if (error) |
| 1044 | goto out_trans_cancel; |
| 1045 | |
| 1046 | xfs_trans_ijoin(tp, ip, 0); |
| 1047 | |
| 1048 | xfs_bmap_init(&free_list, &firstfsb); |
| 1049 | error = xfs_bunmapi(tp, ip, startoffset_fsb, len_fsb, 0, 2, &firstfsb, |
| 1050 | &free_list, done); |
| 1051 | if (error) |
| 1052 | goto out_bmap_cancel; |
| 1053 | |
| 1054 | error = xfs_bmap_finish(&tp, &free_list, NULL); |
| 1055 | if (error) |
| 1056 | goto out_bmap_cancel; |
| 1057 | |
| 1058 | error = xfs_trans_commit(tp); |
| 1059 | out_unlock: |
| 1060 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1061 | return error; |
Christoph Hellwig | bdb0d04 | 2016-06-21 10:00:55 +1000 | [diff] [blame] | 1062 | |
| 1063 | out_bmap_cancel: |
| 1064 | xfs_bmap_cancel(&free_list); |
| 1065 | out_trans_cancel: |
| 1066 | xfs_trans_cancel(tp); |
| 1067 | goto out_unlock; |
| 1068 | } |
| 1069 | |
| 1070 | static int |
| 1071 | xfs_adjust_extent_unmap_boundaries( |
| 1072 | struct xfs_inode *ip, |
| 1073 | xfs_fileoff_t *startoffset_fsb, |
| 1074 | xfs_fileoff_t *endoffset_fsb) |
| 1075 | { |
| 1076 | struct xfs_mount *mp = ip->i_mount; |
| 1077 | struct xfs_bmbt_irec imap; |
| 1078 | int nimap, error; |
| 1079 | xfs_extlen_t mod = 0; |
| 1080 | |
| 1081 | nimap = 1; |
| 1082 | error = xfs_bmapi_read(ip, *startoffset_fsb, 1, &imap, &nimap, 0); |
| 1083 | if (error) |
| 1084 | return error; |
| 1085 | |
| 1086 | if (nimap && imap.br_startblock != HOLESTARTBLOCK) { |
| 1087 | xfs_daddr_t block; |
| 1088 | |
| 1089 | ASSERT(imap.br_startblock != DELAYSTARTBLOCK); |
| 1090 | block = imap.br_startblock; |
| 1091 | mod = do_div(block, mp->m_sb.sb_rextsize); |
| 1092 | if (mod) |
| 1093 | *startoffset_fsb += mp->m_sb.sb_rextsize - mod; |
| 1094 | } |
| 1095 | |
| 1096 | nimap = 1; |
| 1097 | error = xfs_bmapi_read(ip, *endoffset_fsb - 1, 1, &imap, &nimap, 0); |
| 1098 | if (error) |
| 1099 | return error; |
| 1100 | |
| 1101 | if (nimap && imap.br_startblock != HOLESTARTBLOCK) { |
| 1102 | ASSERT(imap.br_startblock != DELAYSTARTBLOCK); |
| 1103 | mod++; |
| 1104 | if (mod && mod != mp->m_sb.sb_rextsize) |
| 1105 | *endoffset_fsb -= mod; |
| 1106 | } |
| 1107 | |
| 1108 | return 0; |
| 1109 | } |
| 1110 | |
| 1111 | static int |
| 1112 | xfs_flush_unmap_range( |
| 1113 | struct xfs_inode *ip, |
| 1114 | xfs_off_t offset, |
| 1115 | xfs_off_t len) |
| 1116 | { |
| 1117 | struct xfs_mount *mp = ip->i_mount; |
| 1118 | struct inode *inode = VFS_I(ip); |
| 1119 | xfs_off_t rounding, start, end; |
| 1120 | int error; |
| 1121 | |
| 1122 | /* wait for the completion of any pending DIOs */ |
| 1123 | inode_dio_wait(inode); |
| 1124 | |
| 1125 | rounding = max_t(xfs_off_t, 1 << mp->m_sb.sb_blocklog, PAGE_SIZE); |
| 1126 | start = round_down(offset, rounding); |
| 1127 | end = round_up(offset + len, rounding) - 1; |
| 1128 | |
| 1129 | error = filemap_write_and_wait_range(inode->i_mapping, start, end); |
| 1130 | if (error) |
| 1131 | return error; |
| 1132 | truncate_pagecache_range(inode, start, end); |
| 1133 | return 0; |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1134 | } |
| 1135 | |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 1136 | int |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1137 | xfs_free_file_space( |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 1138 | struct xfs_inode *ip, |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1139 | xfs_off_t offset, |
Christoph Hellwig | 5f8aca8 | 2013-10-12 00:55:06 -0700 | [diff] [blame] | 1140 | xfs_off_t len) |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1141 | { |
Christoph Hellwig | bdb0d04 | 2016-06-21 10:00:55 +1000 | [diff] [blame] | 1142 | struct xfs_mount *mp = ip->i_mount; |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1143 | xfs_fileoff_t startoffset_fsb; |
Christoph Hellwig | bdb0d04 | 2016-06-21 10:00:55 +1000 | [diff] [blame] | 1144 | xfs_fileoff_t endoffset_fsb; |
Christoph Hellwig | 3c2bdc9 | 2016-06-21 10:02:23 +1000 | [diff] [blame] | 1145 | int done = 0, error; |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1146 | |
| 1147 | trace_xfs_free_file_space(ip); |
| 1148 | |
| 1149 | error = xfs_qm_dqattach(ip, 0); |
| 1150 | if (error) |
| 1151 | return error; |
| 1152 | |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1153 | if (len <= 0) /* if nothing being freed */ |
Christoph Hellwig | bdb0d04 | 2016-06-21 10:00:55 +1000 | [diff] [blame] | 1154 | return 0; |
| 1155 | |
| 1156 | error = xfs_flush_unmap_range(ip, offset, len); |
| 1157 | if (error) |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1158 | return error; |
Christoph Hellwig | bdb0d04 | 2016-06-21 10:00:55 +1000 | [diff] [blame] | 1159 | |
| 1160 | startoffset_fsb = XFS_B_TO_FSB(mp, offset); |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1161 | endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len); |
| 1162 | |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1163 | /* |
Christoph Hellwig | bdb0d04 | 2016-06-21 10:00:55 +1000 | [diff] [blame] | 1164 | * Need to zero the stuff we're not freeing, on disk. If it's a RT file |
| 1165 | * and we can't use unwritten extents then we actually need to ensure |
| 1166 | * to zero the whole extent, otherwise we just need to take of block |
| 1167 | * boundaries, and xfs_bunmapi will handle the rest. |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1168 | */ |
Christoph Hellwig | bdb0d04 | 2016-06-21 10:00:55 +1000 | [diff] [blame] | 1169 | if (XFS_IS_REALTIME_INODE(ip) && |
| 1170 | !xfs_sb_version_hasextflgbit(&mp->m_sb)) { |
| 1171 | error = xfs_adjust_extent_unmap_boundaries(ip, &startoffset_fsb, |
| 1172 | &endoffset_fsb); |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1173 | if (error) |
Christoph Hellwig | bdb0d04 | 2016-06-21 10:00:55 +1000 | [diff] [blame] | 1174 | return error; |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1175 | } |
Christoph Hellwig | bdb0d04 | 2016-06-21 10:00:55 +1000 | [diff] [blame] | 1176 | |
Christoph Hellwig | 3c2bdc9 | 2016-06-21 10:02:23 +1000 | [diff] [blame] | 1177 | if (endoffset_fsb > startoffset_fsb) { |
| 1178 | while (!done) { |
| 1179 | error = xfs_unmap_extent(ip, startoffset_fsb, |
| 1180 | endoffset_fsb - startoffset_fsb, &done); |
| 1181 | if (error) |
| 1182 | return error; |
| 1183 | } |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1184 | } |
| 1185 | |
| 1186 | /* |
Christoph Hellwig | 3c2bdc9 | 2016-06-21 10:02:23 +1000 | [diff] [blame] | 1187 | * Now that we've unmap all full blocks we'll have to zero out any |
| 1188 | * partial block at the beginning and/or end. xfs_zero_range is |
| 1189 | * smart enough to skip any holes, including those we just created. |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1190 | */ |
Christoph Hellwig | 3c2bdc9 | 2016-06-21 10:02:23 +1000 | [diff] [blame] | 1191 | return xfs_zero_range(ip, offset, len, NULL); |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1192 | } |
| 1193 | |
Brian Foster | 5d11fb4 | 2014-10-30 10:35:11 +1100 | [diff] [blame] | 1194 | /* |
| 1195 | * Preallocate and zero a range of a file. This mechanism has the allocation |
| 1196 | * semantics of fallocate and in addition converts data in the range to zeroes. |
| 1197 | */ |
Christoph Hellwig | 865e944 | 2013-10-12 00:55:08 -0700 | [diff] [blame] | 1198 | int |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1199 | xfs_zero_file_space( |
| 1200 | struct xfs_inode *ip, |
| 1201 | xfs_off_t offset, |
Christoph Hellwig | 5f8aca8 | 2013-10-12 00:55:06 -0700 | [diff] [blame] | 1202 | xfs_off_t len) |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1203 | { |
| 1204 | struct xfs_mount *mp = ip->i_mount; |
Brian Foster | 5d11fb4 | 2014-10-30 10:35:11 +1100 | [diff] [blame] | 1205 | uint blksize; |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1206 | int error; |
| 1207 | |
Dave Chinner | 897b73b | 2014-04-14 18:15:11 +1000 | [diff] [blame] | 1208 | trace_xfs_zero_file_space(ip); |
| 1209 | |
Brian Foster | 5d11fb4 | 2014-10-30 10:35:11 +1100 | [diff] [blame] | 1210 | blksize = 1 << mp->m_sb.sb_blocklog; |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1211 | |
| 1212 | /* |
Brian Foster | 5d11fb4 | 2014-10-30 10:35:11 +1100 | [diff] [blame] | 1213 | * Punch a hole and prealloc the range. We use hole punch rather than |
| 1214 | * unwritten extent conversion for two reasons: |
| 1215 | * |
| 1216 | * 1.) Hole punch handles partial block zeroing for us. |
| 1217 | * |
| 1218 | * 2.) If prealloc returns ENOSPC, the file range is still zero-valued |
| 1219 | * by virtue of the hole punch. |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1220 | */ |
Brian Foster | 5d11fb4 | 2014-10-30 10:35:11 +1100 | [diff] [blame] | 1221 | error = xfs_free_file_space(ip, offset, len); |
| 1222 | if (error) |
| 1223 | goto out; |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1224 | |
Brian Foster | 5d11fb4 | 2014-10-30 10:35:11 +1100 | [diff] [blame] | 1225 | error = xfs_alloc_file_space(ip, round_down(offset, blksize), |
| 1226 | round_up(offset + len, blksize) - |
| 1227 | round_down(offset, blksize), |
| 1228 | XFS_BMAPI_PREALLOC); |
Christoph Hellwig | 5f8aca8 | 2013-10-12 00:55:06 -0700 | [diff] [blame] | 1229 | out: |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 1230 | return error; |
| 1231 | |
| 1232 | } |
| 1233 | |
| 1234 | /* |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 1235 | * @next_fsb will keep track of the extent currently undergoing shift. |
| 1236 | * @stop_fsb will keep track of the extent at which we have to stop. |
| 1237 | * If we are shifting left, we will start with block (offset + len) and |
| 1238 | * shift each extent till last extent. |
| 1239 | * If we are shifting right, we will start with last extent inside file space |
| 1240 | * and continue until we reach the block corresponding to offset. |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 1241 | */ |
kbuild test robot | 72c1a73 | 2015-04-13 11:25:04 +1000 | [diff] [blame] | 1242 | static int |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 1243 | xfs_shift_file_space( |
| 1244 | struct xfs_inode *ip, |
| 1245 | xfs_off_t offset, |
| 1246 | xfs_off_t len, |
| 1247 | enum shift_direction direction) |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 1248 | { |
| 1249 | int done = 0; |
| 1250 | struct xfs_mount *mp = ip->i_mount; |
| 1251 | struct xfs_trans *tp; |
| 1252 | int error; |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 1253 | struct xfs_bmap_free free_list; |
| 1254 | xfs_fsblock_t first_block; |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 1255 | xfs_fileoff_t stop_fsb; |
Brian Foster | 2c845f5 | 2014-09-23 15:37:09 +1000 | [diff] [blame] | 1256 | xfs_fileoff_t next_fsb; |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 1257 | xfs_fileoff_t shift_fsb; |
| 1258 | |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 1259 | ASSERT(direction == SHIFT_LEFT || direction == SHIFT_RIGHT); |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 1260 | |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 1261 | if (direction == SHIFT_LEFT) { |
| 1262 | next_fsb = XFS_B_TO_FSB(mp, offset + len); |
| 1263 | stop_fsb = XFS_B_TO_FSB(mp, VFS_I(ip)->i_size); |
| 1264 | } else { |
| 1265 | /* |
| 1266 | * If right shift, delegate the work of initialization of |
| 1267 | * next_fsb to xfs_bmap_shift_extent as it has ilock held. |
| 1268 | */ |
| 1269 | next_fsb = NULLFSBLOCK; |
| 1270 | stop_fsb = XFS_B_TO_FSB(mp, offset); |
| 1271 | } |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 1272 | |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 1273 | shift_fsb = XFS_B_TO_FSB(mp, len); |
| 1274 | |
Brian Foster | f71721d | 2014-09-23 15:39:05 +1000 | [diff] [blame] | 1275 | /* |
| 1276 | * Trim eofblocks to avoid shifting uninitialized post-eof preallocation |
| 1277 | * into the accessible region of the file. |
| 1278 | */ |
Brian Foster | 41b9d72 | 2014-09-02 12:12:53 +1000 | [diff] [blame] | 1279 | if (xfs_can_free_eofblocks(ip, true)) { |
| 1280 | error = xfs_free_eofblocks(mp, ip, false); |
| 1281 | if (error) |
| 1282 | return error; |
| 1283 | } |
Dave Chinner | 1669a8c | 2014-09-02 12:12:53 +1000 | [diff] [blame] | 1284 | |
Brian Foster | f71721d | 2014-09-23 15:39:05 +1000 | [diff] [blame] | 1285 | /* |
| 1286 | * Writeback and invalidate cache for the remainder of the file as we're |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 1287 | * about to shift down every extent from offset to EOF. |
Brian Foster | f71721d | 2014-09-23 15:39:05 +1000 | [diff] [blame] | 1288 | */ |
| 1289 | error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping, |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 1290 | offset, -1); |
Brian Foster | f71721d | 2014-09-23 15:39:05 +1000 | [diff] [blame] | 1291 | if (error) |
| 1292 | return error; |
| 1293 | error = invalidate_inode_pages2_range(VFS_I(ip)->i_mapping, |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1294 | offset >> PAGE_SHIFT, -1); |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 1295 | if (error) |
| 1296 | return error; |
| 1297 | |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 1298 | /* |
| 1299 | * The extent shiting code works on extent granularity. So, if |
| 1300 | * stop_fsb is not the starting block of extent, we need to split |
| 1301 | * the extent at stop_fsb. |
| 1302 | */ |
| 1303 | if (direction == SHIFT_RIGHT) { |
| 1304 | error = xfs_bmap_split_extent(ip, stop_fsb); |
| 1305 | if (error) |
| 1306 | return error; |
| 1307 | } |
| 1308 | |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 1309 | while (!error && !done) { |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 1310 | /* |
| 1311 | * We would need to reserve permanent block for transaction. |
| 1312 | * This will come into picture when after shifting extent into |
| 1313 | * hole we found that adjacent extents can be merged which |
| 1314 | * may lead to freeing of a block during record update. |
| 1315 | */ |
Christoph Hellwig | 253f491 | 2016-04-06 09:19:55 +1000 | [diff] [blame] | 1316 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, |
| 1317 | XFS_DIOSTRAT_SPACE_RES(mp, 0), 0, 0, &tp); |
| 1318 | if (error) |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 1319 | break; |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 1320 | |
| 1321 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
| 1322 | error = xfs_trans_reserve_quota(tp, mp, ip->i_udquot, |
| 1323 | ip->i_gdquot, ip->i_pdquot, |
| 1324 | XFS_DIOSTRAT_SPACE_RES(mp, 0), 0, |
| 1325 | XFS_QMOPT_RES_REGBLKS); |
| 1326 | if (error) |
Brian Foster | d4a97a0 | 2015-08-19 10:01:40 +1000 | [diff] [blame] | 1327 | goto out_trans_cancel; |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 1328 | |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 1329 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 1330 | |
| 1331 | xfs_bmap_init(&free_list, &first_block); |
| 1332 | |
| 1333 | /* |
| 1334 | * We are using the write transaction in which max 2 bmbt |
| 1335 | * updates are allowed |
| 1336 | */ |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 1337 | error = xfs_bmap_shift_extents(tp, ip, &next_fsb, shift_fsb, |
| 1338 | &done, stop_fsb, &first_block, &free_list, |
| 1339 | direction, XFS_BMAP_MAX_SHIFT_EXTENTS); |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 1340 | if (error) |
Brian Foster | d4a97a0 | 2015-08-19 10:01:40 +1000 | [diff] [blame] | 1341 | goto out_bmap_cancel; |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 1342 | |
Eric Sandeen | f6106ef | 2016-01-11 11:34:01 +1100 | [diff] [blame] | 1343 | error = xfs_bmap_finish(&tp, &free_list, NULL); |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 1344 | if (error) |
Brian Foster | d4a97a0 | 2015-08-19 10:01:40 +1000 | [diff] [blame] | 1345 | goto out_bmap_cancel; |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 1346 | |
Christoph Hellwig | 7039331 | 2015-06-04 13:48:08 +1000 | [diff] [blame] | 1347 | error = xfs_trans_commit(tp); |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 1348 | } |
| 1349 | |
| 1350 | return error; |
| 1351 | |
Brian Foster | d4a97a0 | 2015-08-19 10:01:40 +1000 | [diff] [blame] | 1352 | out_bmap_cancel: |
| 1353 | xfs_bmap_cancel(&free_list); |
| 1354 | out_trans_cancel: |
Christoph Hellwig | 4906e21 | 2015-06-04 13:47:56 +1000 | [diff] [blame] | 1355 | xfs_trans_cancel(tp); |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 1356 | return error; |
| 1357 | } |
| 1358 | |
| 1359 | /* |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 1360 | * xfs_collapse_file_space() |
| 1361 | * This routine frees disk space and shift extent for the given file. |
| 1362 | * The first thing we do is to free data blocks in the specified range |
| 1363 | * by calling xfs_free_file_space(). It would also sync dirty data |
| 1364 | * and invalidate page cache over the region on which collapse range |
| 1365 | * is working. And Shift extent records to the left to cover a hole. |
| 1366 | * RETURNS: |
| 1367 | * 0 on success |
| 1368 | * errno on error |
| 1369 | * |
| 1370 | */ |
| 1371 | int |
| 1372 | xfs_collapse_file_space( |
| 1373 | struct xfs_inode *ip, |
| 1374 | xfs_off_t offset, |
| 1375 | xfs_off_t len) |
| 1376 | { |
| 1377 | int error; |
| 1378 | |
| 1379 | ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); |
| 1380 | trace_xfs_collapse_file_space(ip); |
| 1381 | |
| 1382 | error = xfs_free_file_space(ip, offset, len); |
| 1383 | if (error) |
| 1384 | return error; |
| 1385 | |
| 1386 | return xfs_shift_file_space(ip, offset, len, SHIFT_LEFT); |
| 1387 | } |
| 1388 | |
| 1389 | /* |
| 1390 | * xfs_insert_file_space() |
| 1391 | * This routine create hole space by shifting extents for the given file. |
| 1392 | * The first thing we do is to sync dirty data and invalidate page cache |
| 1393 | * over the region on which insert range is working. And split an extent |
| 1394 | * to two extents at given offset by calling xfs_bmap_split_extent. |
| 1395 | * And shift all extent records which are laying between [offset, |
| 1396 | * last allocated extent] to the right to reserve hole range. |
| 1397 | * RETURNS: |
| 1398 | * 0 on success |
| 1399 | * errno on error |
| 1400 | */ |
| 1401 | int |
| 1402 | xfs_insert_file_space( |
| 1403 | struct xfs_inode *ip, |
| 1404 | loff_t offset, |
| 1405 | loff_t len) |
| 1406 | { |
| 1407 | ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); |
| 1408 | trace_xfs_insert_file_space(ip); |
| 1409 | |
| 1410 | return xfs_shift_file_space(ip, offset, len, SHIFT_RIGHT); |
| 1411 | } |
| 1412 | |
| 1413 | /* |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1414 | * We need to check that the format of the data fork in the temporary inode is |
| 1415 | * valid for the target inode before doing the swap. This is not a problem with |
| 1416 | * attr1 because of the fixed fork offset, but attr2 has a dynamically sized |
| 1417 | * data fork depending on the space the attribute fork is taking so we can get |
| 1418 | * invalid formats on the target inode. |
| 1419 | * |
| 1420 | * E.g. target has space for 7 extents in extent format, temp inode only has |
| 1421 | * space for 6. If we defragment down to 7 extents, then the tmp format is a |
| 1422 | * btree, but when swapped it needs to be in extent format. Hence we can't just |
| 1423 | * blindly swap data forks on attr2 filesystems. |
| 1424 | * |
| 1425 | * Note that we check the swap in both directions so that we don't end up with |
| 1426 | * a corrupt temporary inode, either. |
| 1427 | * |
| 1428 | * Note that fixing the way xfs_fsr sets up the attribute fork in the source |
| 1429 | * inode will prevent this situation from occurring, so all we do here is |
| 1430 | * reject and log the attempt. basically we are putting the responsibility on |
| 1431 | * userspace to get this right. |
| 1432 | */ |
| 1433 | static int |
| 1434 | xfs_swap_extents_check_format( |
| 1435 | xfs_inode_t *ip, /* target inode */ |
| 1436 | xfs_inode_t *tip) /* tmp inode */ |
| 1437 | { |
| 1438 | |
| 1439 | /* Should never get a local format */ |
| 1440 | if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL || |
| 1441 | tip->i_d.di_format == XFS_DINODE_FMT_LOCAL) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1442 | return -EINVAL; |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1443 | |
| 1444 | /* |
| 1445 | * if the target inode has less extents that then temporary inode then |
| 1446 | * why did userspace call us? |
| 1447 | */ |
| 1448 | if (ip->i_d.di_nextents < tip->i_d.di_nextents) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1449 | return -EINVAL; |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1450 | |
| 1451 | /* |
| 1452 | * if the target inode is in extent form and the temp inode is in btree |
| 1453 | * form then we will end up with the target inode in the wrong format |
| 1454 | * as we already know there are less extents in the temp inode. |
| 1455 | */ |
| 1456 | if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS && |
| 1457 | tip->i_d.di_format == XFS_DINODE_FMT_BTREE) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1458 | return -EINVAL; |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1459 | |
| 1460 | /* Check temp in extent form to max in target */ |
| 1461 | if (tip->i_d.di_format == XFS_DINODE_FMT_EXTENTS && |
| 1462 | XFS_IFORK_NEXTENTS(tip, XFS_DATA_FORK) > |
| 1463 | XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK)) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1464 | return -EINVAL; |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1465 | |
| 1466 | /* Check target in extent form to max in temp */ |
| 1467 | if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS && |
| 1468 | XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK) > |
| 1469 | XFS_IFORK_MAXEXT(tip, XFS_DATA_FORK)) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1470 | return -EINVAL; |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1471 | |
| 1472 | /* |
| 1473 | * If we are in a btree format, check that the temp root block will fit |
| 1474 | * in the target and that it has enough extents to be in btree format |
| 1475 | * in the target. |
| 1476 | * |
| 1477 | * Note that we have to be careful to allow btree->extent conversions |
| 1478 | * (a common defrag case) which will occur when the temp inode is in |
| 1479 | * extent format... |
| 1480 | */ |
| 1481 | if (tip->i_d.di_format == XFS_DINODE_FMT_BTREE) { |
| 1482 | if (XFS_IFORK_BOFF(ip) && |
| 1483 | XFS_BMAP_BMDR_SPACE(tip->i_df.if_broot) > XFS_IFORK_BOFF(ip)) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1484 | return -EINVAL; |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1485 | if (XFS_IFORK_NEXTENTS(tip, XFS_DATA_FORK) <= |
| 1486 | XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK)) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1487 | return -EINVAL; |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1488 | } |
| 1489 | |
| 1490 | /* Reciprocal target->temp btree format checks */ |
| 1491 | if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE) { |
| 1492 | if (XFS_IFORK_BOFF(tip) && |
| 1493 | XFS_BMAP_BMDR_SPACE(ip->i_df.if_broot) > XFS_IFORK_BOFF(tip)) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1494 | return -EINVAL; |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1495 | if (XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK) <= |
| 1496 | XFS_IFORK_MAXEXT(tip, XFS_DATA_FORK)) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1497 | return -EINVAL; |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1498 | } |
| 1499 | |
| 1500 | return 0; |
| 1501 | } |
| 1502 | |
Dave Chinner | 7abbb8f | 2014-09-23 16:20:11 +1000 | [diff] [blame] | 1503 | static int |
Dave Chinner | 4ef897a | 2014-08-04 13:44:08 +1000 | [diff] [blame] | 1504 | xfs_swap_extent_flush( |
| 1505 | struct xfs_inode *ip) |
| 1506 | { |
| 1507 | int error; |
| 1508 | |
| 1509 | error = filemap_write_and_wait(VFS_I(ip)->i_mapping); |
| 1510 | if (error) |
| 1511 | return error; |
| 1512 | truncate_pagecache_range(VFS_I(ip), 0, -1); |
| 1513 | |
| 1514 | /* Verify O_DIRECT for ftmp */ |
| 1515 | if (VFS_I(ip)->i_mapping->nrpages) |
| 1516 | return -EINVAL; |
Dave Chinner | 4ef897a | 2014-08-04 13:44:08 +1000 | [diff] [blame] | 1517 | return 0; |
| 1518 | } |
| 1519 | |
| 1520 | int |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1521 | xfs_swap_extents( |
| 1522 | xfs_inode_t *ip, /* target inode */ |
| 1523 | xfs_inode_t *tip, /* tmp inode */ |
| 1524 | xfs_swapext_t *sxp) |
| 1525 | { |
| 1526 | xfs_mount_t *mp = ip->i_mount; |
| 1527 | xfs_trans_t *tp; |
| 1528 | xfs_bstat_t *sbp = &sxp->sx_stat; |
| 1529 | xfs_ifork_t *tempifp, *ifp, *tifp; |
| 1530 | int src_log_flags, target_log_flags; |
| 1531 | int error = 0; |
| 1532 | int aforkblks = 0; |
| 1533 | int taforkblks = 0; |
| 1534 | __uint64_t tmp; |
Dave Chinner | 8121768 | 2014-08-04 13:29:32 +1000 | [diff] [blame] | 1535 | int lock_flags; |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1536 | |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1537 | tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL); |
| 1538 | if (!tempifp) { |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1539 | error = -ENOMEM; |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1540 | goto out; |
| 1541 | } |
| 1542 | |
| 1543 | /* |
Dave Chinner | 723cac4 | 2015-02-23 21:47:29 +1100 | [diff] [blame] | 1544 | * Lock the inodes against other IO, page faults and truncate to |
| 1545 | * begin with. Then we can ensure the inodes are flushed and have no |
| 1546 | * page cache safely. Once we have done this we can take the ilocks and |
| 1547 | * do the rest of the checks. |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1548 | */ |
Dave Chinner | 723cac4 | 2015-02-23 21:47:29 +1100 | [diff] [blame] | 1549 | lock_flags = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL; |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1550 | xfs_lock_two_inodes(ip, tip, XFS_IOLOCK_EXCL); |
Dave Chinner | 723cac4 | 2015-02-23 21:47:29 +1100 | [diff] [blame] | 1551 | xfs_lock_two_inodes(ip, tip, XFS_MMAPLOCK_EXCL); |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1552 | |
| 1553 | /* Verify that both files have the same format */ |
Dave Chinner | c19b3b05 | 2016-02-09 16:54:58 +1100 | [diff] [blame] | 1554 | if ((VFS_I(ip)->i_mode & S_IFMT) != (VFS_I(tip)->i_mode & S_IFMT)) { |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1555 | error = -EINVAL; |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1556 | goto out_unlock; |
| 1557 | } |
| 1558 | |
| 1559 | /* Verify both files are either real-time or non-realtime */ |
| 1560 | if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) { |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1561 | error = -EINVAL; |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1562 | goto out_unlock; |
| 1563 | } |
| 1564 | |
Dave Chinner | 4ef897a | 2014-08-04 13:44:08 +1000 | [diff] [blame] | 1565 | error = xfs_swap_extent_flush(ip); |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1566 | if (error) |
| 1567 | goto out_unlock; |
Dave Chinner | 4ef897a | 2014-08-04 13:44:08 +1000 | [diff] [blame] | 1568 | error = xfs_swap_extent_flush(tip); |
| 1569 | if (error) |
| 1570 | goto out_unlock; |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1571 | |
Christoph Hellwig | 253f491 | 2016-04-06 09:19:55 +1000 | [diff] [blame] | 1572 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp); |
| 1573 | if (error) |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1574 | goto out_unlock; |
Dave Chinner | 723cac4 | 2015-02-23 21:47:29 +1100 | [diff] [blame] | 1575 | |
| 1576 | /* |
| 1577 | * Lock and join the inodes to the tansaction so that transaction commit |
| 1578 | * or cancel will unlock the inodes from this point onwards. |
| 1579 | */ |
Dave Chinner | 4ef897a | 2014-08-04 13:44:08 +1000 | [diff] [blame] | 1580 | xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL); |
| 1581 | lock_flags |= XFS_ILOCK_EXCL; |
Dave Chinner | 723cac4 | 2015-02-23 21:47:29 +1100 | [diff] [blame] | 1582 | xfs_trans_ijoin(tp, ip, lock_flags); |
| 1583 | xfs_trans_ijoin(tp, tip, lock_flags); |
| 1584 | |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1585 | |
| 1586 | /* Verify all data are being swapped */ |
| 1587 | if (sxp->sx_offset != 0 || |
| 1588 | sxp->sx_length != ip->i_d.di_size || |
| 1589 | sxp->sx_length != tip->i_d.di_size) { |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1590 | error = -EFAULT; |
Dave Chinner | 4ef897a | 2014-08-04 13:44:08 +1000 | [diff] [blame] | 1591 | goto out_trans_cancel; |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1592 | } |
| 1593 | |
| 1594 | trace_xfs_swap_extent_before(ip, 0); |
| 1595 | trace_xfs_swap_extent_before(tip, 1); |
| 1596 | |
| 1597 | /* check inode formats now that data is flushed */ |
| 1598 | error = xfs_swap_extents_check_format(ip, tip); |
| 1599 | if (error) { |
| 1600 | xfs_notice(mp, |
| 1601 | "%s: inode 0x%llx format is incompatible for exchanging.", |
| 1602 | __func__, ip->i_ino); |
Dave Chinner | 4ef897a | 2014-08-04 13:44:08 +1000 | [diff] [blame] | 1603 | goto out_trans_cancel; |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1604 | } |
| 1605 | |
| 1606 | /* |
| 1607 | * Compare the current change & modify times with that |
| 1608 | * passed in. If they differ, we abort this swap. |
| 1609 | * This is the mechanism used to ensure the calling |
| 1610 | * process that the file was not changed out from |
| 1611 | * under it. |
| 1612 | */ |
| 1613 | if ((sbp->bs_ctime.tv_sec != VFS_I(ip)->i_ctime.tv_sec) || |
| 1614 | (sbp->bs_ctime.tv_nsec != VFS_I(ip)->i_ctime.tv_nsec) || |
| 1615 | (sbp->bs_mtime.tv_sec != VFS_I(ip)->i_mtime.tv_sec) || |
| 1616 | (sbp->bs_mtime.tv_nsec != VFS_I(ip)->i_mtime.tv_nsec)) { |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1617 | error = -EBUSY; |
Dave Chinner | 8121768 | 2014-08-04 13:29:32 +1000 | [diff] [blame] | 1618 | goto out_trans_cancel; |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1619 | } |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1620 | /* |
| 1621 | * Count the number of extended attribute blocks |
| 1622 | */ |
| 1623 | if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) && |
| 1624 | (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) { |
| 1625 | error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks); |
| 1626 | if (error) |
| 1627 | goto out_trans_cancel; |
| 1628 | } |
| 1629 | if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) && |
| 1630 | (tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) { |
| 1631 | error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK, |
| 1632 | &taforkblks); |
| 1633 | if (error) |
| 1634 | goto out_trans_cancel; |
| 1635 | } |
| 1636 | |
Dave Chinner | 21b5c97 | 2013-08-30 10:23:44 +1000 | [diff] [blame] | 1637 | /* |
| 1638 | * Before we've swapped the forks, lets set the owners of the forks |
| 1639 | * appropriately. We have to do this as we are demand paging the btree |
| 1640 | * buffers, and so the validation done on read will expect the owner |
| 1641 | * field to be correctly set. Once we change the owners, we can swap the |
| 1642 | * inode forks. |
| 1643 | * |
| 1644 | * Note the trickiness in setting the log flags - we set the owner log |
| 1645 | * flag on the opposite inode (i.e. the inode we are setting the new |
| 1646 | * owner to be) because once we swap the forks and log that, log |
| 1647 | * recovery is going to see the fork as owned by the swapped inode, |
| 1648 | * not the pre-swapped inodes. |
| 1649 | */ |
| 1650 | src_log_flags = XFS_ILOG_CORE; |
| 1651 | target_log_flags = XFS_ILOG_CORE; |
| 1652 | if (ip->i_d.di_version == 3 && |
| 1653 | ip->i_d.di_format == XFS_DINODE_FMT_BTREE) { |
Dave Chinner | 638f4416 | 2013-08-30 10:23:45 +1000 | [diff] [blame] | 1654 | target_log_flags |= XFS_ILOG_DOWNER; |
| 1655 | error = xfs_bmbt_change_owner(tp, ip, XFS_DATA_FORK, |
| 1656 | tip->i_ino, NULL); |
Dave Chinner | 21b5c97 | 2013-08-30 10:23:44 +1000 | [diff] [blame] | 1657 | if (error) |
| 1658 | goto out_trans_cancel; |
| 1659 | } |
| 1660 | |
| 1661 | if (tip->i_d.di_version == 3 && |
| 1662 | tip->i_d.di_format == XFS_DINODE_FMT_BTREE) { |
Dave Chinner | 638f4416 | 2013-08-30 10:23:45 +1000 | [diff] [blame] | 1663 | src_log_flags |= XFS_ILOG_DOWNER; |
| 1664 | error = xfs_bmbt_change_owner(tp, tip, XFS_DATA_FORK, |
| 1665 | ip->i_ino, NULL); |
Dave Chinner | 21b5c97 | 2013-08-30 10:23:44 +1000 | [diff] [blame] | 1666 | if (error) |
| 1667 | goto out_trans_cancel; |
| 1668 | } |
| 1669 | |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1670 | /* |
| 1671 | * Swap the data forks of the inodes |
| 1672 | */ |
| 1673 | ifp = &ip->i_df; |
| 1674 | tifp = &tip->i_df; |
| 1675 | *tempifp = *ifp; /* struct copy */ |
| 1676 | *ifp = *tifp; /* struct copy */ |
| 1677 | *tifp = *tempifp; /* struct copy */ |
| 1678 | |
| 1679 | /* |
| 1680 | * Fix the on-disk inode values |
| 1681 | */ |
| 1682 | tmp = (__uint64_t)ip->i_d.di_nblocks; |
| 1683 | ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks; |
| 1684 | tip->i_d.di_nblocks = tmp + taforkblks - aforkblks; |
| 1685 | |
| 1686 | tmp = (__uint64_t) ip->i_d.di_nextents; |
| 1687 | ip->i_d.di_nextents = tip->i_d.di_nextents; |
| 1688 | tip->i_d.di_nextents = tmp; |
| 1689 | |
| 1690 | tmp = (__uint64_t) ip->i_d.di_format; |
| 1691 | ip->i_d.di_format = tip->i_d.di_format; |
| 1692 | tip->i_d.di_format = tmp; |
| 1693 | |
| 1694 | /* |
| 1695 | * The extents in the source inode could still contain speculative |
| 1696 | * preallocation beyond EOF (e.g. the file is open but not modified |
| 1697 | * while defrag is in progress). In that case, we need to copy over the |
| 1698 | * number of delalloc blocks the data fork in the source inode is |
| 1699 | * tracking beyond EOF so that when the fork is truncated away when the |
| 1700 | * temporary inode is unlinked we don't underrun the i_delayed_blks |
| 1701 | * counter on that inode. |
| 1702 | */ |
| 1703 | ASSERT(tip->i_delayed_blks == 0); |
| 1704 | tip->i_delayed_blks = ip->i_delayed_blks; |
| 1705 | ip->i_delayed_blks = 0; |
| 1706 | |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1707 | switch (ip->i_d.di_format) { |
| 1708 | case XFS_DINODE_FMT_EXTENTS: |
| 1709 | /* If the extents fit in the inode, fix the |
| 1710 | * pointer. Otherwise it's already NULL or |
| 1711 | * pointing to the extent. |
| 1712 | */ |
| 1713 | if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) { |
| 1714 | ifp->if_u1.if_extents = |
| 1715 | ifp->if_u2.if_inline_ext; |
| 1716 | } |
| 1717 | src_log_flags |= XFS_ILOG_DEXT; |
| 1718 | break; |
| 1719 | case XFS_DINODE_FMT_BTREE: |
Dave Chinner | 21b5c97 | 2013-08-30 10:23:44 +1000 | [diff] [blame] | 1720 | ASSERT(ip->i_d.di_version < 3 || |
Dave Chinner | 638f4416 | 2013-08-30 10:23:45 +1000 | [diff] [blame] | 1721 | (src_log_flags & XFS_ILOG_DOWNER)); |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1722 | src_log_flags |= XFS_ILOG_DBROOT; |
| 1723 | break; |
| 1724 | } |
| 1725 | |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1726 | switch (tip->i_d.di_format) { |
| 1727 | case XFS_DINODE_FMT_EXTENTS: |
| 1728 | /* If the extents fit in the inode, fix the |
| 1729 | * pointer. Otherwise it's already NULL or |
| 1730 | * pointing to the extent. |
| 1731 | */ |
| 1732 | if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) { |
| 1733 | tifp->if_u1.if_extents = |
| 1734 | tifp->if_u2.if_inline_ext; |
| 1735 | } |
| 1736 | target_log_flags |= XFS_ILOG_DEXT; |
| 1737 | break; |
| 1738 | case XFS_DINODE_FMT_BTREE: |
| 1739 | target_log_flags |= XFS_ILOG_DBROOT; |
Dave Chinner | 21b5c97 | 2013-08-30 10:23:44 +1000 | [diff] [blame] | 1740 | ASSERT(tip->i_d.di_version < 3 || |
Dave Chinner | 638f4416 | 2013-08-30 10:23:45 +1000 | [diff] [blame] | 1741 | (target_log_flags & XFS_ILOG_DOWNER)); |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1742 | break; |
| 1743 | } |
| 1744 | |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1745 | xfs_trans_log_inode(tp, ip, src_log_flags); |
| 1746 | xfs_trans_log_inode(tp, tip, target_log_flags); |
| 1747 | |
| 1748 | /* |
| 1749 | * If this is a synchronous mount, make sure that the |
| 1750 | * transaction goes to disk before returning to the user. |
| 1751 | */ |
| 1752 | if (mp->m_flags & XFS_MOUNT_WSYNC) |
| 1753 | xfs_trans_set_sync(tp); |
| 1754 | |
Christoph Hellwig | 7039331 | 2015-06-04 13:48:08 +1000 | [diff] [blame] | 1755 | error = xfs_trans_commit(tp); |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1756 | |
| 1757 | trace_xfs_swap_extent_after(ip, 0); |
| 1758 | trace_xfs_swap_extent_after(tip, 1); |
| 1759 | out: |
| 1760 | kmem_free(tempifp); |
| 1761 | return error; |
| 1762 | |
| 1763 | out_unlock: |
Dave Chinner | 8121768 | 2014-08-04 13:29:32 +1000 | [diff] [blame] | 1764 | xfs_iunlock(ip, lock_flags); |
| 1765 | xfs_iunlock(tip, lock_flags); |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1766 | goto out; |
| 1767 | |
| 1768 | out_trans_cancel: |
Christoph Hellwig | 4906e21 | 2015-06-04 13:47:56 +1000 | [diff] [blame] | 1769 | xfs_trans_cancel(tp); |
Dave Chinner | 723cac4 | 2015-02-23 21:47:29 +1100 | [diff] [blame] | 1770 | goto out; |
Dave Chinner | a133d95 | 2013-08-12 20:49:48 +1000 | [diff] [blame] | 1771 | } |