Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 2 | * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. |
| 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" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include "xfs_log.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 22 | #include "xfs_inum.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include "xfs_trans.h" |
| 24 | #include "xfs_sb.h" |
| 25 | #include "xfs_dir.h" |
| 26 | #include "xfs_dir2.h" |
| 27 | #include "xfs_dmapi.h" |
| 28 | #include "xfs_mount.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 29 | #include "xfs_da_btree.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include "xfs_bmap_btree.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include "xfs_dir_sf.h" |
| 32 | #include "xfs_dir2_sf.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 33 | #include "xfs_attr_sf.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include "xfs_dinode.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include "xfs_inode.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 36 | #include "xfs_inode_item.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include "xfs_dir_leaf.h" |
| 38 | #include "xfs_error.h" |
| 39 | #include "xfs_dir2_data.h" |
| 40 | #include "xfs_dir2_leaf.h" |
| 41 | #include "xfs_dir2_block.h" |
| 42 | #include "xfs_dir2_trace.h" |
| 43 | |
| 44 | /* |
| 45 | * Prototypes for internal functions. |
| 46 | */ |
| 47 | static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args, |
| 48 | xfs_dir2_sf_entry_t *sfep, |
| 49 | xfs_dir2_data_aoff_t offset, |
| 50 | int new_isize); |
| 51 | static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange, |
| 52 | int new_isize); |
| 53 | static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange, |
| 54 | xfs_dir2_sf_entry_t **sfepp, |
| 55 | xfs_dir2_data_aoff_t *offsetp); |
| 56 | #ifdef DEBUG |
| 57 | static void xfs_dir2_sf_check(xfs_da_args_t *args); |
| 58 | #else |
| 59 | #define xfs_dir2_sf_check(args) |
| 60 | #endif /* DEBUG */ |
| 61 | #if XFS_BIG_INUMS |
| 62 | static void xfs_dir2_sf_toino4(xfs_da_args_t *args); |
| 63 | static void xfs_dir2_sf_toino8(xfs_da_args_t *args); |
| 64 | #endif /* XFS_BIG_INUMS */ |
| 65 | |
| 66 | /* |
| 67 | * Given a block directory (dp/block), calculate its size as a shortform (sf) |
| 68 | * directory and a header for the sf directory, if it will fit it the |
| 69 | * space currently present in the inode. If it won't fit, the output |
| 70 | * size is too big (but not accurate). |
| 71 | */ |
| 72 | int /* size for sf form */ |
| 73 | xfs_dir2_block_sfsize( |
| 74 | xfs_inode_t *dp, /* incore inode pointer */ |
| 75 | xfs_dir2_block_t *block, /* block directory data */ |
| 76 | xfs_dir2_sf_hdr_t *sfhp) /* output: header for sf form */ |
| 77 | { |
| 78 | xfs_dir2_dataptr_t addr; /* data entry address */ |
| 79 | xfs_dir2_leaf_entry_t *blp; /* leaf area of the block */ |
| 80 | xfs_dir2_block_tail_t *btp; /* tail area of the block */ |
| 81 | int count; /* shortform entry count */ |
| 82 | xfs_dir2_data_entry_t *dep; /* data entry in the block */ |
| 83 | int i; /* block entry index */ |
| 84 | int i8count; /* count of big-inode entries */ |
| 85 | int isdot; /* entry is "." */ |
| 86 | int isdotdot; /* entry is ".." */ |
| 87 | xfs_mount_t *mp; /* mount structure pointer */ |
| 88 | int namelen; /* total name bytes */ |
Christoph Hellwig | 5bde1ba | 2005-11-02 15:06:18 +1100 | [diff] [blame] | 89 | xfs_ino_t parent = 0; /* parent inode number */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | int size=0; /* total computed size */ |
| 91 | |
| 92 | mp = dp->i_mount; |
| 93 | |
| 94 | count = i8count = namelen = 0; |
| 95 | btp = XFS_DIR2_BLOCK_TAIL_P(mp, block); |
| 96 | blp = XFS_DIR2_BLOCK_LEAF_P(btp); |
| 97 | |
| 98 | /* |
| 99 | * Iterate over the block's data entries by using the leaf pointers. |
| 100 | */ |
Nathan Scott | e922fff | 2006-03-17 17:27:56 +1100 | [diff] [blame] | 101 | for (i = 0; i < be32_to_cpu(btp->count); i++) { |
Nathan Scott | 3c1f9c1 | 2006-03-17 17:28:18 +1100 | [diff] [blame] | 102 | if ((addr = be32_to_cpu(blp[i].address)) == XFS_DIR2_NULL_DATAPTR) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | continue; |
| 104 | /* |
| 105 | * Calculate the pointer to the entry at hand. |
| 106 | */ |
| 107 | dep = (xfs_dir2_data_entry_t *) |
| 108 | ((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, addr)); |
| 109 | /* |
| 110 | * Detect . and .., so we can special-case them. |
| 111 | * . is not included in sf directories. |
| 112 | * .. is included by just the parent inode number. |
| 113 | */ |
| 114 | isdot = dep->namelen == 1 && dep->name[0] == '.'; |
| 115 | isdotdot = |
| 116 | dep->namelen == 2 && |
| 117 | dep->name[0] == '.' && dep->name[1] == '.'; |
| 118 | #if XFS_BIG_INUMS |
| 119 | if (!isdot) |
| 120 | i8count += INT_GET(dep->inumber, ARCH_CONVERT) > XFS_DIR2_MAX_SHORT_INUM; |
| 121 | #endif |
| 122 | if (!isdot && !isdotdot) { |
| 123 | count++; |
| 124 | namelen += dep->namelen; |
| 125 | } else if (isdotdot) |
| 126 | parent = INT_GET(dep->inumber, ARCH_CONVERT); |
| 127 | /* |
| 128 | * Calculate the new size, see if we should give up yet. |
| 129 | */ |
| 130 | size = XFS_DIR2_SF_HDR_SIZE(i8count) + /* header */ |
| 131 | count + /* namelen */ |
| 132 | count * (uint)sizeof(xfs_dir2_sf_off_t) + /* offset */ |
| 133 | namelen + /* name */ |
| 134 | (i8count ? /* inumber */ |
| 135 | (uint)sizeof(xfs_dir2_ino8_t) * count : |
| 136 | (uint)sizeof(xfs_dir2_ino4_t) * count); |
| 137 | if (size > XFS_IFORK_DSIZE(dp)) |
| 138 | return size; /* size value is a failure */ |
| 139 | } |
| 140 | /* |
| 141 | * Create the output header, if it worked. |
| 142 | */ |
| 143 | sfhp->count = count; |
| 144 | sfhp->i8count = i8count; |
| 145 | XFS_DIR2_SF_PUT_INUMBER((xfs_dir2_sf_t *)sfhp, &parent, &sfhp->parent); |
| 146 | return size; |
| 147 | } |
| 148 | |
| 149 | /* |
| 150 | * Convert a block format directory to shortform. |
| 151 | * Caller has already checked that it will fit, and built us a header. |
| 152 | */ |
| 153 | int /* error */ |
| 154 | xfs_dir2_block_to_sf( |
| 155 | xfs_da_args_t *args, /* operation arguments */ |
| 156 | xfs_dabuf_t *bp, /* block buffer */ |
| 157 | int size, /* shortform directory size */ |
| 158 | xfs_dir2_sf_hdr_t *sfhp) /* shortform directory hdr */ |
| 159 | { |
| 160 | xfs_dir2_block_t *block; /* block structure */ |
| 161 | xfs_dir2_block_tail_t *btp; /* block tail pointer */ |
| 162 | xfs_dir2_data_entry_t *dep; /* data entry pointer */ |
| 163 | xfs_inode_t *dp; /* incore directory inode */ |
| 164 | xfs_dir2_data_unused_t *dup; /* unused data pointer */ |
| 165 | char *endptr; /* end of data entries */ |
| 166 | int error; /* error return value */ |
| 167 | int logflags; /* inode logging flags */ |
| 168 | xfs_mount_t *mp; /* filesystem mount point */ |
| 169 | char *ptr; /* current data pointer */ |
| 170 | xfs_dir2_sf_entry_t *sfep; /* shortform entry */ |
| 171 | xfs_dir2_sf_t *sfp; /* shortform structure */ |
| 172 | xfs_ino_t temp; |
| 173 | |
| 174 | xfs_dir2_trace_args_sb("block_to_sf", args, size, bp); |
| 175 | dp = args->dp; |
| 176 | mp = dp->i_mount; |
| 177 | |
| 178 | /* |
| 179 | * Make a copy of the block data, so we can shrink the inode |
| 180 | * and add local data. |
| 181 | */ |
| 182 | block = kmem_alloc(mp->m_dirblksize, KM_SLEEP); |
| 183 | memcpy(block, bp->data, mp->m_dirblksize); |
| 184 | logflags = XFS_ILOG_CORE; |
| 185 | if ((error = xfs_dir2_shrink_inode(args, mp->m_dirdatablk, bp))) { |
| 186 | ASSERT(error != ENOSPC); |
| 187 | goto out; |
| 188 | } |
| 189 | /* |
| 190 | * The buffer is now unconditionally gone, whether |
| 191 | * xfs_dir2_shrink_inode worked or not. |
| 192 | * |
| 193 | * Convert the inode to local format. |
| 194 | */ |
| 195 | dp->i_df.if_flags &= ~XFS_IFEXTENTS; |
| 196 | dp->i_df.if_flags |= XFS_IFINLINE; |
| 197 | dp->i_d.di_format = XFS_DINODE_FMT_LOCAL; |
| 198 | ASSERT(dp->i_df.if_bytes == 0); |
| 199 | xfs_idata_realloc(dp, size, XFS_DATA_FORK); |
| 200 | logflags |= XFS_ILOG_DDATA; |
| 201 | /* |
| 202 | * Copy the header into the newly allocate local space. |
| 203 | */ |
| 204 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; |
| 205 | memcpy(sfp, sfhp, XFS_DIR2_SF_HDR_SIZE(sfhp->i8count)); |
| 206 | dp->i_d.di_size = size; |
| 207 | /* |
| 208 | * Set up to loop over the block's entries. |
| 209 | */ |
| 210 | btp = XFS_DIR2_BLOCK_TAIL_P(mp, block); |
| 211 | ptr = (char *)block->u; |
| 212 | endptr = (char *)XFS_DIR2_BLOCK_LEAF_P(btp); |
| 213 | sfep = XFS_DIR2_SF_FIRSTENTRY(sfp); |
| 214 | /* |
| 215 | * Loop over the active and unused entries. |
| 216 | * Stop when we reach the leaf/tail portion of the block. |
| 217 | */ |
| 218 | while (ptr < endptr) { |
| 219 | /* |
| 220 | * If it's unused, just skip over it. |
| 221 | */ |
| 222 | dup = (xfs_dir2_data_unused_t *)ptr; |
Nathan Scott | ad354eb | 2006-03-17 17:27:37 +1100 | [diff] [blame] | 223 | if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) { |
| 224 | ptr += be16_to_cpu(dup->length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | continue; |
| 226 | } |
| 227 | dep = (xfs_dir2_data_entry_t *)ptr; |
| 228 | /* |
| 229 | * Skip . |
| 230 | */ |
| 231 | if (dep->namelen == 1 && dep->name[0] == '.') |
| 232 | ASSERT(INT_GET(dep->inumber, ARCH_CONVERT) == dp->i_ino); |
| 233 | /* |
| 234 | * Skip .., but make sure the inode number is right. |
| 235 | */ |
| 236 | else if (dep->namelen == 2 && |
| 237 | dep->name[0] == '.' && dep->name[1] == '.') |
| 238 | ASSERT(INT_GET(dep->inumber, ARCH_CONVERT) == |
| 239 | XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent)); |
| 240 | /* |
| 241 | * Normal entry, copy it into shortform. |
| 242 | */ |
| 243 | else { |
| 244 | sfep->namelen = dep->namelen; |
| 245 | XFS_DIR2_SF_PUT_OFFSET(sfep, |
| 246 | (xfs_dir2_data_aoff_t) |
| 247 | ((char *)dep - (char *)block)); |
| 248 | memcpy(sfep->name, dep->name, dep->namelen); |
| 249 | temp=INT_GET(dep->inumber, ARCH_CONVERT); |
| 250 | XFS_DIR2_SF_PUT_INUMBER(sfp, &temp, |
| 251 | XFS_DIR2_SF_INUMBERP(sfep)); |
| 252 | sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep); |
| 253 | } |
| 254 | ptr += XFS_DIR2_DATA_ENTSIZE(dep->namelen); |
| 255 | } |
| 256 | ASSERT((char *)sfep - (char *)sfp == size); |
| 257 | xfs_dir2_sf_check(args); |
| 258 | out: |
| 259 | xfs_trans_log_inode(args->trans, dp, logflags); |
| 260 | kmem_free(block, mp->m_dirblksize); |
| 261 | return error; |
| 262 | } |
| 263 | |
| 264 | /* |
| 265 | * Add a name to a shortform directory. |
| 266 | * There are two algorithms, "easy" and "hard" which we decide on |
| 267 | * before changing anything. |
| 268 | * Convert to block form if necessary, if the new entry won't fit. |
| 269 | */ |
| 270 | int /* error */ |
| 271 | xfs_dir2_sf_addname( |
| 272 | xfs_da_args_t *args) /* operation arguments */ |
| 273 | { |
| 274 | int add_entsize; /* size of the new entry */ |
| 275 | xfs_inode_t *dp; /* incore directory inode */ |
| 276 | int error; /* error return value */ |
| 277 | int incr_isize; /* total change in size */ |
| 278 | int new_isize; /* di_size after adding name */ |
| 279 | int objchange; /* changing to 8-byte inodes */ |
Christoph Hellwig | 5bde1ba | 2005-11-02 15:06:18 +1100 | [diff] [blame] | 280 | xfs_dir2_data_aoff_t offset = 0; /* offset for new entry */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | int old_isize; /* di_size before adding name */ |
| 282 | int pick; /* which algorithm to use */ |
| 283 | xfs_dir2_sf_t *sfp; /* shortform structure */ |
Christoph Hellwig | 5bde1ba | 2005-11-02 15:06:18 +1100 | [diff] [blame] | 284 | xfs_dir2_sf_entry_t *sfep = NULL; /* shortform entry */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | |
| 286 | xfs_dir2_trace_args("sf_addname", args); |
| 287 | ASSERT(xfs_dir2_sf_lookup(args) == ENOENT); |
| 288 | dp = args->dp; |
| 289 | ASSERT(dp->i_df.if_flags & XFS_IFINLINE); |
| 290 | /* |
| 291 | * Make sure the shortform value has some of its header. |
| 292 | */ |
| 293 | if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) { |
| 294 | ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount)); |
| 295 | return XFS_ERROR(EIO); |
| 296 | } |
| 297 | ASSERT(dp->i_df.if_bytes == dp->i_d.di_size); |
| 298 | ASSERT(dp->i_df.if_u1.if_data != NULL); |
| 299 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; |
| 300 | ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count)); |
| 301 | /* |
| 302 | * Compute entry (and change in) size. |
| 303 | */ |
| 304 | add_entsize = XFS_DIR2_SF_ENTSIZE_BYNAME(sfp, args->namelen); |
| 305 | incr_isize = add_entsize; |
| 306 | objchange = 0; |
| 307 | #if XFS_BIG_INUMS |
| 308 | /* |
| 309 | * Do we have to change to 8 byte inodes? |
| 310 | */ |
| 311 | if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->hdr.i8count == 0) { |
| 312 | /* |
| 313 | * Yes, adjust the entry size and the total size. |
| 314 | */ |
| 315 | add_entsize += |
| 316 | (uint)sizeof(xfs_dir2_ino8_t) - |
| 317 | (uint)sizeof(xfs_dir2_ino4_t); |
| 318 | incr_isize += |
| 319 | (sfp->hdr.count + 2) * |
| 320 | ((uint)sizeof(xfs_dir2_ino8_t) - |
| 321 | (uint)sizeof(xfs_dir2_ino4_t)); |
| 322 | objchange = 1; |
| 323 | } |
| 324 | #endif |
| 325 | old_isize = (int)dp->i_d.di_size; |
| 326 | new_isize = old_isize + incr_isize; |
| 327 | /* |
| 328 | * Won't fit as shortform any more (due to size), |
| 329 | * or the pick routine says it won't (due to offset values). |
| 330 | */ |
| 331 | if (new_isize > XFS_IFORK_DSIZE(dp) || |
| 332 | (pick = |
| 333 | xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) { |
| 334 | /* |
| 335 | * Just checking or no space reservation, it doesn't fit. |
| 336 | */ |
| 337 | if (args->justcheck || args->total == 0) |
| 338 | return XFS_ERROR(ENOSPC); |
| 339 | /* |
| 340 | * Convert to block form then add the name. |
| 341 | */ |
| 342 | error = xfs_dir2_sf_to_block(args); |
| 343 | if (error) |
| 344 | return error; |
| 345 | return xfs_dir2_block_addname(args); |
| 346 | } |
| 347 | /* |
| 348 | * Just checking, it fits. |
| 349 | */ |
| 350 | if (args->justcheck) |
| 351 | return 0; |
| 352 | /* |
| 353 | * Do it the easy way - just add it at the end. |
| 354 | */ |
| 355 | if (pick == 1) |
| 356 | xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize); |
| 357 | /* |
| 358 | * Do it the hard way - look for a place to insert the new entry. |
| 359 | * Convert to 8 byte inode numbers first if necessary. |
| 360 | */ |
| 361 | else { |
| 362 | ASSERT(pick == 2); |
| 363 | #if XFS_BIG_INUMS |
| 364 | if (objchange) |
| 365 | xfs_dir2_sf_toino8(args); |
| 366 | #endif |
| 367 | xfs_dir2_sf_addname_hard(args, objchange, new_isize); |
| 368 | } |
| 369 | xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA); |
| 370 | return 0; |
| 371 | } |
| 372 | |
| 373 | /* |
| 374 | * Add the new entry the "easy" way. |
| 375 | * This is copying the old directory and adding the new entry at the end. |
| 376 | * Since it's sorted by "offset" we need room after the last offset |
| 377 | * that's already there, and then room to convert to a block directory. |
| 378 | * This is already checked by the pick routine. |
| 379 | */ |
| 380 | static void |
| 381 | xfs_dir2_sf_addname_easy( |
| 382 | xfs_da_args_t *args, /* operation arguments */ |
| 383 | xfs_dir2_sf_entry_t *sfep, /* pointer to new entry */ |
| 384 | xfs_dir2_data_aoff_t offset, /* offset to use for new ent */ |
| 385 | int new_isize) /* new directory size */ |
| 386 | { |
| 387 | int byteoff; /* byte offset in sf dir */ |
| 388 | xfs_inode_t *dp; /* incore directory inode */ |
| 389 | xfs_dir2_sf_t *sfp; /* shortform structure */ |
| 390 | |
| 391 | dp = args->dp; |
| 392 | |
| 393 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; |
| 394 | byteoff = (int)((char *)sfep - (char *)sfp); |
| 395 | /* |
| 396 | * Grow the in-inode space. |
| 397 | */ |
| 398 | xfs_idata_realloc(dp, XFS_DIR2_SF_ENTSIZE_BYNAME(sfp, args->namelen), |
| 399 | XFS_DATA_FORK); |
| 400 | /* |
| 401 | * Need to set up again due to realloc of the inode data. |
| 402 | */ |
| 403 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; |
| 404 | sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + byteoff); |
| 405 | /* |
| 406 | * Fill in the new entry. |
| 407 | */ |
| 408 | sfep->namelen = args->namelen; |
| 409 | XFS_DIR2_SF_PUT_OFFSET(sfep, offset); |
| 410 | memcpy(sfep->name, args->name, sfep->namelen); |
| 411 | XFS_DIR2_SF_PUT_INUMBER(sfp, &args->inumber, |
| 412 | XFS_DIR2_SF_INUMBERP(sfep)); |
| 413 | /* |
| 414 | * Update the header and inode. |
| 415 | */ |
| 416 | sfp->hdr.count++; |
| 417 | #if XFS_BIG_INUMS |
| 418 | if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) |
| 419 | sfp->hdr.i8count++; |
| 420 | #endif |
| 421 | dp->i_d.di_size = new_isize; |
| 422 | xfs_dir2_sf_check(args); |
| 423 | } |
| 424 | |
| 425 | /* |
| 426 | * Add the new entry the "hard" way. |
| 427 | * The caller has already converted to 8 byte inode numbers if necessary, |
| 428 | * in which case we need to leave the i8count at 1. |
| 429 | * Find a hole that the new entry will fit into, and copy |
| 430 | * the first part of the entries, the new entry, and the last part of |
| 431 | * the entries. |
| 432 | */ |
| 433 | /* ARGSUSED */ |
| 434 | static void |
| 435 | xfs_dir2_sf_addname_hard( |
| 436 | xfs_da_args_t *args, /* operation arguments */ |
| 437 | int objchange, /* changing inode number size */ |
| 438 | int new_isize) /* new directory size */ |
| 439 | { |
| 440 | int add_datasize; /* data size need for new ent */ |
| 441 | char *buf; /* buffer for old */ |
| 442 | xfs_inode_t *dp; /* incore directory inode */ |
| 443 | int eof; /* reached end of old dir */ |
| 444 | int nbytes; /* temp for byte copies */ |
| 445 | xfs_dir2_data_aoff_t new_offset; /* next offset value */ |
| 446 | xfs_dir2_data_aoff_t offset; /* current offset value */ |
| 447 | int old_isize; /* previous di_size */ |
| 448 | xfs_dir2_sf_entry_t *oldsfep; /* entry in original dir */ |
| 449 | xfs_dir2_sf_t *oldsfp; /* original shortform dir */ |
| 450 | xfs_dir2_sf_entry_t *sfep; /* entry in new dir */ |
| 451 | xfs_dir2_sf_t *sfp; /* new shortform dir */ |
| 452 | |
| 453 | /* |
| 454 | * Copy the old directory to the stack buffer. |
| 455 | */ |
| 456 | dp = args->dp; |
| 457 | |
| 458 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; |
| 459 | old_isize = (int)dp->i_d.di_size; |
| 460 | buf = kmem_alloc(old_isize, KM_SLEEP); |
| 461 | oldsfp = (xfs_dir2_sf_t *)buf; |
| 462 | memcpy(oldsfp, sfp, old_isize); |
| 463 | /* |
| 464 | * Loop over the old directory finding the place we're going |
| 465 | * to insert the new entry. |
| 466 | * If it's going to end up at the end then oldsfep will point there. |
| 467 | */ |
| 468 | for (offset = XFS_DIR2_DATA_FIRST_OFFSET, |
| 469 | oldsfep = XFS_DIR2_SF_FIRSTENTRY(oldsfp), |
| 470 | add_datasize = XFS_DIR2_DATA_ENTSIZE(args->namelen), |
| 471 | eof = (char *)oldsfep == &buf[old_isize]; |
| 472 | !eof; |
| 473 | offset = new_offset + XFS_DIR2_DATA_ENTSIZE(oldsfep->namelen), |
| 474 | oldsfep = XFS_DIR2_SF_NEXTENTRY(oldsfp, oldsfep), |
| 475 | eof = (char *)oldsfep == &buf[old_isize]) { |
| 476 | new_offset = XFS_DIR2_SF_GET_OFFSET(oldsfep); |
| 477 | if (offset + add_datasize <= new_offset) |
| 478 | break; |
| 479 | } |
| 480 | /* |
| 481 | * Get rid of the old directory, then allocate space for |
| 482 | * the new one. We do this so xfs_idata_realloc won't copy |
| 483 | * the data. |
| 484 | */ |
| 485 | xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK); |
| 486 | xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK); |
| 487 | /* |
| 488 | * Reset the pointer since the buffer was reallocated. |
| 489 | */ |
| 490 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; |
| 491 | /* |
| 492 | * Copy the first part of the directory, including the header. |
| 493 | */ |
| 494 | nbytes = (int)((char *)oldsfep - (char *)oldsfp); |
| 495 | memcpy(sfp, oldsfp, nbytes); |
| 496 | sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes); |
| 497 | /* |
| 498 | * Fill in the new entry, and update the header counts. |
| 499 | */ |
| 500 | sfep->namelen = args->namelen; |
| 501 | XFS_DIR2_SF_PUT_OFFSET(sfep, offset); |
| 502 | memcpy(sfep->name, args->name, sfep->namelen); |
| 503 | XFS_DIR2_SF_PUT_INUMBER(sfp, &args->inumber, |
| 504 | XFS_DIR2_SF_INUMBERP(sfep)); |
| 505 | sfp->hdr.count++; |
| 506 | #if XFS_BIG_INUMS |
| 507 | if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange) |
| 508 | sfp->hdr.i8count++; |
| 509 | #endif |
| 510 | /* |
| 511 | * If there's more left to copy, do that. |
| 512 | */ |
| 513 | if (!eof) { |
| 514 | sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep); |
| 515 | memcpy(sfep, oldsfep, old_isize - nbytes); |
| 516 | } |
| 517 | kmem_free(buf, old_isize); |
| 518 | dp->i_d.di_size = new_isize; |
| 519 | xfs_dir2_sf_check(args); |
| 520 | } |
| 521 | |
| 522 | /* |
| 523 | * Decide if the new entry will fit at all. |
| 524 | * If it will fit, pick between adding the new entry to the end (easy) |
| 525 | * or somewhere else (hard). |
| 526 | * Return 0 (won't fit), 1 (easy), 2 (hard). |
| 527 | */ |
| 528 | /*ARGSUSED*/ |
| 529 | static int /* pick result */ |
| 530 | xfs_dir2_sf_addname_pick( |
| 531 | xfs_da_args_t *args, /* operation arguments */ |
| 532 | int objchange, /* inode # size changes */ |
| 533 | xfs_dir2_sf_entry_t **sfepp, /* out(1): new entry ptr */ |
| 534 | xfs_dir2_data_aoff_t *offsetp) /* out(1): new offset */ |
| 535 | { |
| 536 | xfs_inode_t *dp; /* incore directory inode */ |
| 537 | int holefit; /* found hole it will fit in */ |
| 538 | int i; /* entry number */ |
| 539 | xfs_mount_t *mp; /* filesystem mount point */ |
| 540 | xfs_dir2_data_aoff_t offset; /* data block offset */ |
| 541 | xfs_dir2_sf_entry_t *sfep; /* shortform entry */ |
| 542 | xfs_dir2_sf_t *sfp; /* shortform structure */ |
| 543 | int size; /* entry's data size */ |
| 544 | int used; /* data bytes used */ |
| 545 | |
| 546 | dp = args->dp; |
| 547 | mp = dp->i_mount; |
| 548 | |
| 549 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; |
| 550 | size = XFS_DIR2_DATA_ENTSIZE(args->namelen); |
| 551 | offset = XFS_DIR2_DATA_FIRST_OFFSET; |
| 552 | sfep = XFS_DIR2_SF_FIRSTENTRY(sfp); |
| 553 | holefit = 0; |
| 554 | /* |
| 555 | * Loop over sf entries. |
| 556 | * Keep track of data offset and whether we've seen a place |
| 557 | * to insert the new entry. |
| 558 | */ |
| 559 | for (i = 0; i < sfp->hdr.count; i++) { |
| 560 | if (!holefit) |
| 561 | holefit = offset + size <= XFS_DIR2_SF_GET_OFFSET(sfep); |
| 562 | offset = XFS_DIR2_SF_GET_OFFSET(sfep) + |
| 563 | XFS_DIR2_DATA_ENTSIZE(sfep->namelen); |
| 564 | sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep); |
| 565 | } |
| 566 | /* |
| 567 | * Calculate data bytes used excluding the new entry, if this |
| 568 | * was a data block (block form directory). |
| 569 | */ |
| 570 | used = offset + |
| 571 | (sfp->hdr.count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) + |
| 572 | (uint)sizeof(xfs_dir2_block_tail_t); |
| 573 | /* |
| 574 | * If it won't fit in a block form then we can't insert it, |
| 575 | * we'll go back, convert to block, then try the insert and convert |
| 576 | * to leaf. |
| 577 | */ |
| 578 | if (used + (holefit ? 0 : size) > mp->m_dirblksize) |
| 579 | return 0; |
| 580 | /* |
| 581 | * If changing the inode number size, do it the hard way. |
| 582 | */ |
| 583 | #if XFS_BIG_INUMS |
| 584 | if (objchange) { |
| 585 | return 2; |
| 586 | } |
| 587 | #else |
| 588 | ASSERT(objchange == 0); |
| 589 | #endif |
| 590 | /* |
| 591 | * If it won't fit at the end then do it the hard way (use the hole). |
| 592 | */ |
| 593 | if (used + size > mp->m_dirblksize) |
| 594 | return 2; |
| 595 | /* |
| 596 | * Do it the easy way. |
| 597 | */ |
| 598 | *sfepp = sfep; |
| 599 | *offsetp = offset; |
| 600 | return 1; |
| 601 | } |
| 602 | |
| 603 | #ifdef DEBUG |
| 604 | /* |
| 605 | * Check consistency of shortform directory, assert if bad. |
| 606 | */ |
| 607 | static void |
| 608 | xfs_dir2_sf_check( |
| 609 | xfs_da_args_t *args) /* operation arguments */ |
| 610 | { |
| 611 | xfs_inode_t *dp; /* incore directory inode */ |
| 612 | int i; /* entry number */ |
| 613 | int i8count; /* number of big inode#s */ |
| 614 | xfs_ino_t ino; /* entry inode number */ |
| 615 | int offset; /* data offset */ |
| 616 | xfs_dir2_sf_entry_t *sfep; /* shortform dir entry */ |
| 617 | xfs_dir2_sf_t *sfp; /* shortform structure */ |
| 618 | |
| 619 | dp = args->dp; |
| 620 | |
| 621 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; |
| 622 | offset = XFS_DIR2_DATA_FIRST_OFFSET; |
| 623 | ino = XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent); |
| 624 | i8count = ino > XFS_DIR2_MAX_SHORT_INUM; |
| 625 | |
| 626 | for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp); |
| 627 | i < sfp->hdr.count; |
| 628 | i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) { |
| 629 | ASSERT(XFS_DIR2_SF_GET_OFFSET(sfep) >= offset); |
| 630 | ino = XFS_DIR2_SF_GET_INUMBER(sfp, XFS_DIR2_SF_INUMBERP(sfep)); |
| 631 | i8count += ino > XFS_DIR2_MAX_SHORT_INUM; |
| 632 | offset = |
| 633 | XFS_DIR2_SF_GET_OFFSET(sfep) + |
| 634 | XFS_DIR2_DATA_ENTSIZE(sfep->namelen); |
| 635 | } |
| 636 | ASSERT(i8count == sfp->hdr.i8count); |
| 637 | ASSERT(XFS_BIG_INUMS || i8count == 0); |
| 638 | ASSERT((char *)sfep - (char *)sfp == dp->i_d.di_size); |
| 639 | ASSERT(offset + |
| 640 | (sfp->hdr.count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) + |
| 641 | (uint)sizeof(xfs_dir2_block_tail_t) <= |
| 642 | dp->i_mount->m_dirblksize); |
| 643 | } |
| 644 | #endif /* DEBUG */ |
| 645 | |
| 646 | /* |
| 647 | * Create a new (shortform) directory. |
| 648 | */ |
| 649 | int /* error, always 0 */ |
| 650 | xfs_dir2_sf_create( |
| 651 | xfs_da_args_t *args, /* operation arguments */ |
| 652 | xfs_ino_t pino) /* parent inode number */ |
| 653 | { |
| 654 | xfs_inode_t *dp; /* incore directory inode */ |
| 655 | int i8count; /* parent inode is an 8-byte number */ |
| 656 | xfs_dir2_sf_t *sfp; /* shortform structure */ |
| 657 | int size; /* directory size */ |
| 658 | |
| 659 | xfs_dir2_trace_args_i("sf_create", args, pino); |
| 660 | dp = args->dp; |
| 661 | |
| 662 | ASSERT(dp != NULL); |
| 663 | ASSERT(dp->i_d.di_size == 0); |
| 664 | /* |
| 665 | * If it's currently a zero-length extent file, |
| 666 | * convert it to local format. |
| 667 | */ |
| 668 | if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) { |
| 669 | dp->i_df.if_flags &= ~XFS_IFEXTENTS; /* just in case */ |
| 670 | dp->i_d.di_format = XFS_DINODE_FMT_LOCAL; |
| 671 | xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE); |
| 672 | dp->i_df.if_flags |= XFS_IFINLINE; |
| 673 | } |
| 674 | ASSERT(dp->i_df.if_flags & XFS_IFINLINE); |
| 675 | ASSERT(dp->i_df.if_bytes == 0); |
| 676 | i8count = pino > XFS_DIR2_MAX_SHORT_INUM; |
| 677 | size = XFS_DIR2_SF_HDR_SIZE(i8count); |
| 678 | /* |
| 679 | * Make a buffer for the data. |
| 680 | */ |
| 681 | xfs_idata_realloc(dp, size, XFS_DATA_FORK); |
| 682 | /* |
| 683 | * Fill in the header, |
| 684 | */ |
| 685 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; |
| 686 | sfp->hdr.i8count = i8count; |
| 687 | /* |
| 688 | * Now can put in the inode number, since i8count is set. |
| 689 | */ |
| 690 | XFS_DIR2_SF_PUT_INUMBER(sfp, &pino, &sfp->hdr.parent); |
| 691 | sfp->hdr.count = 0; |
| 692 | dp->i_d.di_size = size; |
| 693 | xfs_dir2_sf_check(args); |
| 694 | xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA); |
| 695 | return 0; |
| 696 | } |
| 697 | |
| 698 | int /* error */ |
| 699 | xfs_dir2_sf_getdents( |
| 700 | xfs_inode_t *dp, /* incore directory inode */ |
| 701 | uio_t *uio, /* caller's buffer control */ |
| 702 | int *eofp, /* eof reached? (out) */ |
| 703 | xfs_dirent_t *dbp, /* caller's buffer */ |
| 704 | xfs_dir2_put_t put) /* abi's formatting function */ |
| 705 | { |
| 706 | int error; /* error return value */ |
| 707 | int i; /* shortform entry number */ |
| 708 | xfs_mount_t *mp; /* filesystem mount point */ |
| 709 | xfs_dir2_dataptr_t off; /* current entry's offset */ |
| 710 | xfs_dir2_put_args_t p; /* arg package for put rtn */ |
| 711 | xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */ |
| 712 | xfs_dir2_sf_t *sfp; /* shortform structure */ |
| 713 | xfs_off_t dir_offset; |
| 714 | |
| 715 | mp = dp->i_mount; |
| 716 | |
| 717 | ASSERT(dp->i_df.if_flags & XFS_IFINLINE); |
| 718 | /* |
| 719 | * Give up if the directory is way too short. |
| 720 | */ |
| 721 | if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) { |
| 722 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); |
| 723 | return XFS_ERROR(EIO); |
| 724 | } |
| 725 | |
| 726 | dir_offset = uio->uio_offset; |
| 727 | |
| 728 | ASSERT(dp->i_df.if_bytes == dp->i_d.di_size); |
| 729 | ASSERT(dp->i_df.if_u1.if_data != NULL); |
| 730 | |
| 731 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; |
| 732 | |
| 733 | ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count)); |
| 734 | |
| 735 | /* |
| 736 | * If the block number in the offset is out of range, we're done. |
| 737 | */ |
| 738 | if (XFS_DIR2_DATAPTR_TO_DB(mp, dir_offset) > mp->m_dirdatablk) { |
| 739 | *eofp = 1; |
| 740 | return 0; |
| 741 | } |
| 742 | |
| 743 | /* |
| 744 | * Set up putargs structure. |
| 745 | */ |
| 746 | p.dbp = dbp; |
| 747 | p.put = put; |
| 748 | p.uio = uio; |
| 749 | /* |
| 750 | * Put . entry unless we're starting past it. |
| 751 | */ |
| 752 | if (dir_offset <= |
| 753 | XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk, |
| 754 | XFS_DIR2_DATA_DOT_OFFSET)) { |
| 755 | p.cook = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, 0, |
| 756 | XFS_DIR2_DATA_DOTDOT_OFFSET); |
| 757 | p.ino = dp->i_ino; |
| 758 | #if XFS_BIG_INUMS |
| 759 | p.ino += mp->m_inoadd; |
| 760 | #endif |
| 761 | p.name = "."; |
| 762 | p.namelen = 1; |
| 763 | |
| 764 | error = p.put(&p); |
| 765 | |
| 766 | if (!p.done) { |
| 767 | uio->uio_offset = |
| 768 | XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk, |
| 769 | XFS_DIR2_DATA_DOT_OFFSET); |
| 770 | return error; |
| 771 | } |
| 772 | } |
| 773 | |
| 774 | /* |
| 775 | * Put .. entry unless we're starting past it. |
| 776 | */ |
| 777 | if (dir_offset <= |
| 778 | XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk, |
| 779 | XFS_DIR2_DATA_DOTDOT_OFFSET)) { |
| 780 | p.cook = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk, |
| 781 | XFS_DIR2_DATA_FIRST_OFFSET); |
| 782 | p.ino = XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent); |
| 783 | #if XFS_BIG_INUMS |
| 784 | p.ino += mp->m_inoadd; |
| 785 | #endif |
| 786 | p.name = ".."; |
| 787 | p.namelen = 2; |
| 788 | |
| 789 | error = p.put(&p); |
| 790 | |
| 791 | if (!p.done) { |
| 792 | uio->uio_offset = |
| 793 | XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk, |
| 794 | XFS_DIR2_DATA_DOTDOT_OFFSET); |
| 795 | return error; |
| 796 | } |
| 797 | } |
| 798 | |
| 799 | /* |
| 800 | * Loop while there are more entries and put'ing works. |
| 801 | */ |
| 802 | for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp); |
| 803 | i < sfp->hdr.count; |
| 804 | i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) { |
| 805 | |
| 806 | off = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk, |
| 807 | XFS_DIR2_SF_GET_OFFSET(sfep)); |
| 808 | |
| 809 | if (dir_offset > off) |
| 810 | continue; |
| 811 | |
| 812 | p.namelen = sfep->namelen; |
| 813 | |
| 814 | p.cook = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk, |
| 815 | XFS_DIR2_SF_GET_OFFSET(sfep) + |
| 816 | XFS_DIR2_DATA_ENTSIZE(p.namelen)); |
| 817 | |
| 818 | p.ino = XFS_DIR2_SF_GET_INUMBER(sfp, XFS_DIR2_SF_INUMBERP(sfep)); |
| 819 | #if XFS_BIG_INUMS |
| 820 | p.ino += mp->m_inoadd; |
| 821 | #endif |
| 822 | p.name = (char *)sfep->name; |
| 823 | |
| 824 | error = p.put(&p); |
| 825 | |
| 826 | if (!p.done) { |
| 827 | uio->uio_offset = off; |
| 828 | return error; |
| 829 | } |
| 830 | } |
| 831 | |
| 832 | /* |
| 833 | * They all fit. |
| 834 | */ |
| 835 | *eofp = 1; |
| 836 | |
| 837 | uio->uio_offset = |
| 838 | XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk + 1, 0); |
| 839 | |
| 840 | return 0; |
| 841 | } |
| 842 | |
| 843 | /* |
| 844 | * Lookup an entry in a shortform directory. |
| 845 | * Returns EEXIST if found, ENOENT if not found. |
| 846 | */ |
| 847 | int /* error */ |
| 848 | xfs_dir2_sf_lookup( |
| 849 | xfs_da_args_t *args) /* operation arguments */ |
| 850 | { |
| 851 | xfs_inode_t *dp; /* incore directory inode */ |
| 852 | int i; /* entry index */ |
| 853 | xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */ |
| 854 | xfs_dir2_sf_t *sfp; /* shortform structure */ |
| 855 | |
| 856 | xfs_dir2_trace_args("sf_lookup", args); |
| 857 | xfs_dir2_sf_check(args); |
| 858 | dp = args->dp; |
| 859 | |
| 860 | ASSERT(dp->i_df.if_flags & XFS_IFINLINE); |
| 861 | /* |
| 862 | * Bail out if the directory is way too short. |
| 863 | */ |
| 864 | if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) { |
| 865 | ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount)); |
| 866 | return XFS_ERROR(EIO); |
| 867 | } |
| 868 | ASSERT(dp->i_df.if_bytes == dp->i_d.di_size); |
| 869 | ASSERT(dp->i_df.if_u1.if_data != NULL); |
| 870 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; |
| 871 | ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count)); |
| 872 | /* |
| 873 | * Special case for . |
| 874 | */ |
| 875 | if (args->namelen == 1 && args->name[0] == '.') { |
| 876 | args->inumber = dp->i_ino; |
| 877 | return XFS_ERROR(EEXIST); |
| 878 | } |
| 879 | /* |
| 880 | * Special case for .. |
| 881 | */ |
| 882 | if (args->namelen == 2 && |
| 883 | args->name[0] == '.' && args->name[1] == '.') { |
| 884 | args->inumber = XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent); |
| 885 | return XFS_ERROR(EEXIST); |
| 886 | } |
| 887 | /* |
| 888 | * Loop over all the entries trying to match ours. |
| 889 | */ |
| 890 | for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp); |
| 891 | i < sfp->hdr.count; |
| 892 | i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) { |
| 893 | if (sfep->namelen == args->namelen && |
| 894 | sfep->name[0] == args->name[0] && |
| 895 | memcmp(args->name, sfep->name, args->namelen) == 0) { |
| 896 | args->inumber = |
| 897 | XFS_DIR2_SF_GET_INUMBER(sfp, |
| 898 | XFS_DIR2_SF_INUMBERP(sfep)); |
| 899 | return XFS_ERROR(EEXIST); |
| 900 | } |
| 901 | } |
| 902 | /* |
| 903 | * Didn't find it. |
| 904 | */ |
| 905 | ASSERT(args->oknoent); |
| 906 | return XFS_ERROR(ENOENT); |
| 907 | } |
| 908 | |
| 909 | /* |
| 910 | * Remove an entry from a shortform directory. |
| 911 | */ |
| 912 | int /* error */ |
| 913 | xfs_dir2_sf_removename( |
| 914 | xfs_da_args_t *args) |
| 915 | { |
| 916 | int byteoff; /* offset of removed entry */ |
| 917 | xfs_inode_t *dp; /* incore directory inode */ |
| 918 | int entsize; /* this entry's size */ |
| 919 | int i; /* shortform entry index */ |
| 920 | int newsize; /* new inode size */ |
| 921 | int oldsize; /* old inode size */ |
| 922 | xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */ |
| 923 | xfs_dir2_sf_t *sfp; /* shortform structure */ |
| 924 | |
| 925 | xfs_dir2_trace_args("sf_removename", args); |
| 926 | dp = args->dp; |
| 927 | |
| 928 | ASSERT(dp->i_df.if_flags & XFS_IFINLINE); |
| 929 | oldsize = (int)dp->i_d.di_size; |
| 930 | /* |
| 931 | * Bail out if the directory is way too short. |
| 932 | */ |
| 933 | if (oldsize < offsetof(xfs_dir2_sf_hdr_t, parent)) { |
| 934 | ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount)); |
| 935 | return XFS_ERROR(EIO); |
| 936 | } |
| 937 | ASSERT(dp->i_df.if_bytes == oldsize); |
| 938 | ASSERT(dp->i_df.if_u1.if_data != NULL); |
| 939 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; |
| 940 | ASSERT(oldsize >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count)); |
| 941 | /* |
| 942 | * Loop over the old directory entries. |
| 943 | * Find the one we're deleting. |
| 944 | */ |
| 945 | for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp); |
| 946 | i < sfp->hdr.count; |
| 947 | i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) { |
| 948 | if (sfep->namelen == args->namelen && |
| 949 | sfep->name[0] == args->name[0] && |
| 950 | memcmp(sfep->name, args->name, args->namelen) == 0) { |
| 951 | ASSERT(XFS_DIR2_SF_GET_INUMBER(sfp, |
| 952 | XFS_DIR2_SF_INUMBERP(sfep)) == |
| 953 | args->inumber); |
| 954 | break; |
| 955 | } |
| 956 | } |
| 957 | /* |
| 958 | * Didn't find it. |
| 959 | */ |
| 960 | if (i == sfp->hdr.count) { |
| 961 | return XFS_ERROR(ENOENT); |
| 962 | } |
| 963 | /* |
| 964 | * Calculate sizes. |
| 965 | */ |
| 966 | byteoff = (int)((char *)sfep - (char *)sfp); |
| 967 | entsize = XFS_DIR2_SF_ENTSIZE_BYNAME(sfp, args->namelen); |
| 968 | newsize = oldsize - entsize; |
| 969 | /* |
| 970 | * Copy the part if any after the removed entry, sliding it down. |
| 971 | */ |
| 972 | if (byteoff + entsize < oldsize) |
| 973 | memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize, |
| 974 | oldsize - (byteoff + entsize)); |
| 975 | /* |
| 976 | * Fix up the header and file size. |
| 977 | */ |
| 978 | sfp->hdr.count--; |
| 979 | dp->i_d.di_size = newsize; |
| 980 | /* |
| 981 | * Reallocate, making it smaller. |
| 982 | */ |
| 983 | xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK); |
| 984 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; |
| 985 | #if XFS_BIG_INUMS |
| 986 | /* |
| 987 | * Are we changing inode number size? |
| 988 | */ |
| 989 | if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) { |
| 990 | if (sfp->hdr.i8count == 1) |
| 991 | xfs_dir2_sf_toino4(args); |
| 992 | else |
| 993 | sfp->hdr.i8count--; |
| 994 | } |
| 995 | #endif |
| 996 | xfs_dir2_sf_check(args); |
| 997 | xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA); |
| 998 | return 0; |
| 999 | } |
| 1000 | |
| 1001 | /* |
| 1002 | * Replace the inode number of an entry in a shortform directory. |
| 1003 | */ |
| 1004 | int /* error */ |
| 1005 | xfs_dir2_sf_replace( |
| 1006 | xfs_da_args_t *args) /* operation arguments */ |
| 1007 | { |
| 1008 | xfs_inode_t *dp; /* incore directory inode */ |
| 1009 | int i; /* entry index */ |
| 1010 | #if XFS_BIG_INUMS || defined(DEBUG) |
| 1011 | xfs_ino_t ino=0; /* entry old inode number */ |
| 1012 | #endif |
| 1013 | #if XFS_BIG_INUMS |
| 1014 | int i8elevated; /* sf_toino8 set i8count=1 */ |
| 1015 | #endif |
| 1016 | xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */ |
| 1017 | xfs_dir2_sf_t *sfp; /* shortform structure */ |
| 1018 | |
| 1019 | xfs_dir2_trace_args("sf_replace", args); |
| 1020 | dp = args->dp; |
| 1021 | |
| 1022 | ASSERT(dp->i_df.if_flags & XFS_IFINLINE); |
| 1023 | /* |
| 1024 | * Bail out if the shortform directory is way too small. |
| 1025 | */ |
| 1026 | if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) { |
| 1027 | ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount)); |
| 1028 | return XFS_ERROR(EIO); |
| 1029 | } |
| 1030 | ASSERT(dp->i_df.if_bytes == dp->i_d.di_size); |
| 1031 | ASSERT(dp->i_df.if_u1.if_data != NULL); |
| 1032 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; |
| 1033 | ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count)); |
| 1034 | #if XFS_BIG_INUMS |
| 1035 | /* |
| 1036 | * New inode number is large, and need to convert to 8-byte inodes. |
| 1037 | */ |
| 1038 | if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->hdr.i8count == 0) { |
| 1039 | int error; /* error return value */ |
| 1040 | int newsize; /* new inode size */ |
| 1041 | |
| 1042 | newsize = |
| 1043 | dp->i_df.if_bytes + |
| 1044 | (sfp->hdr.count + 1) * |
| 1045 | ((uint)sizeof(xfs_dir2_ino8_t) - |
| 1046 | (uint)sizeof(xfs_dir2_ino4_t)); |
| 1047 | /* |
| 1048 | * Won't fit as shortform, convert to block then do replace. |
| 1049 | */ |
| 1050 | if (newsize > XFS_IFORK_DSIZE(dp)) { |
| 1051 | error = xfs_dir2_sf_to_block(args); |
| 1052 | if (error) { |
| 1053 | return error; |
| 1054 | } |
| 1055 | return xfs_dir2_block_replace(args); |
| 1056 | } |
| 1057 | /* |
| 1058 | * Still fits, convert to 8-byte now. |
| 1059 | */ |
| 1060 | xfs_dir2_sf_toino8(args); |
| 1061 | i8elevated = 1; |
| 1062 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; |
| 1063 | } else |
| 1064 | i8elevated = 0; |
| 1065 | #endif |
| 1066 | ASSERT(args->namelen != 1 || args->name[0] != '.'); |
| 1067 | /* |
| 1068 | * Replace ..'s entry. |
| 1069 | */ |
| 1070 | if (args->namelen == 2 && |
| 1071 | args->name[0] == '.' && args->name[1] == '.') { |
| 1072 | #if XFS_BIG_INUMS || defined(DEBUG) |
| 1073 | ino = XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent); |
| 1074 | ASSERT(args->inumber != ino); |
| 1075 | #endif |
| 1076 | XFS_DIR2_SF_PUT_INUMBER(sfp, &args->inumber, &sfp->hdr.parent); |
| 1077 | } |
| 1078 | /* |
| 1079 | * Normal entry, look for the name. |
| 1080 | */ |
| 1081 | else { |
| 1082 | for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp); |
| 1083 | i < sfp->hdr.count; |
| 1084 | i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) { |
| 1085 | if (sfep->namelen == args->namelen && |
| 1086 | sfep->name[0] == args->name[0] && |
| 1087 | memcmp(args->name, sfep->name, args->namelen) == 0) { |
| 1088 | #if XFS_BIG_INUMS || defined(DEBUG) |
| 1089 | ino = XFS_DIR2_SF_GET_INUMBER(sfp, |
| 1090 | XFS_DIR2_SF_INUMBERP(sfep)); |
| 1091 | ASSERT(args->inumber != ino); |
| 1092 | #endif |
| 1093 | XFS_DIR2_SF_PUT_INUMBER(sfp, &args->inumber, |
| 1094 | XFS_DIR2_SF_INUMBERP(sfep)); |
| 1095 | break; |
| 1096 | } |
| 1097 | } |
| 1098 | /* |
| 1099 | * Didn't find it. |
| 1100 | */ |
| 1101 | if (i == sfp->hdr.count) { |
| 1102 | ASSERT(args->oknoent); |
| 1103 | #if XFS_BIG_INUMS |
| 1104 | if (i8elevated) |
| 1105 | xfs_dir2_sf_toino4(args); |
| 1106 | #endif |
| 1107 | return XFS_ERROR(ENOENT); |
| 1108 | } |
| 1109 | } |
| 1110 | #if XFS_BIG_INUMS |
| 1111 | /* |
| 1112 | * See if the old number was large, the new number is small. |
| 1113 | */ |
| 1114 | if (ino > XFS_DIR2_MAX_SHORT_INUM && |
| 1115 | args->inumber <= XFS_DIR2_MAX_SHORT_INUM) { |
| 1116 | /* |
| 1117 | * And the old count was one, so need to convert to small. |
| 1118 | */ |
| 1119 | if (sfp->hdr.i8count == 1) |
| 1120 | xfs_dir2_sf_toino4(args); |
| 1121 | else |
| 1122 | sfp->hdr.i8count--; |
| 1123 | } |
| 1124 | /* |
| 1125 | * See if the old number was small, the new number is large. |
| 1126 | */ |
| 1127 | if (ino <= XFS_DIR2_MAX_SHORT_INUM && |
| 1128 | args->inumber > XFS_DIR2_MAX_SHORT_INUM) { |
| 1129 | /* |
| 1130 | * add to the i8count unless we just converted to 8-byte |
| 1131 | * inodes (which does an implied i8count = 1) |
| 1132 | */ |
| 1133 | ASSERT(sfp->hdr.i8count != 0); |
| 1134 | if (!i8elevated) |
| 1135 | sfp->hdr.i8count++; |
| 1136 | } |
| 1137 | #endif |
| 1138 | xfs_dir2_sf_check(args); |
| 1139 | xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA); |
| 1140 | return 0; |
| 1141 | } |
| 1142 | |
| 1143 | #if XFS_BIG_INUMS |
| 1144 | /* |
| 1145 | * Convert from 8-byte inode numbers to 4-byte inode numbers. |
| 1146 | * The last 8-byte inode number is gone, but the count is still 1. |
| 1147 | */ |
| 1148 | static void |
| 1149 | xfs_dir2_sf_toino4( |
| 1150 | xfs_da_args_t *args) /* operation arguments */ |
| 1151 | { |
| 1152 | char *buf; /* old dir's buffer */ |
| 1153 | xfs_inode_t *dp; /* incore directory inode */ |
| 1154 | int i; /* entry index */ |
| 1155 | xfs_ino_t ino; /* entry inode number */ |
| 1156 | int newsize; /* new inode size */ |
| 1157 | xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */ |
| 1158 | xfs_dir2_sf_t *oldsfp; /* old sf directory */ |
| 1159 | int oldsize; /* old inode size */ |
| 1160 | xfs_dir2_sf_entry_t *sfep; /* new sf entry */ |
| 1161 | xfs_dir2_sf_t *sfp; /* new sf directory */ |
| 1162 | |
| 1163 | xfs_dir2_trace_args("sf_toino4", args); |
| 1164 | dp = args->dp; |
| 1165 | |
| 1166 | /* |
| 1167 | * Copy the old directory to the buffer. |
| 1168 | * Then nuke it from the inode, and add the new buffer to the inode. |
| 1169 | * Don't want xfs_idata_realloc copying the data here. |
| 1170 | */ |
| 1171 | oldsize = dp->i_df.if_bytes; |
| 1172 | buf = kmem_alloc(oldsize, KM_SLEEP); |
| 1173 | oldsfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; |
| 1174 | ASSERT(oldsfp->hdr.i8count == 1); |
| 1175 | memcpy(buf, oldsfp, oldsize); |
| 1176 | /* |
| 1177 | * Compute the new inode size. |
| 1178 | */ |
| 1179 | newsize = |
| 1180 | oldsize - |
| 1181 | (oldsfp->hdr.count + 1) * |
| 1182 | ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t)); |
| 1183 | xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK); |
| 1184 | xfs_idata_realloc(dp, newsize, XFS_DATA_FORK); |
| 1185 | /* |
| 1186 | * Reset our pointers, the data has moved. |
| 1187 | */ |
| 1188 | oldsfp = (xfs_dir2_sf_t *)buf; |
| 1189 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; |
| 1190 | /* |
| 1191 | * Fill in the new header. |
| 1192 | */ |
| 1193 | sfp->hdr.count = oldsfp->hdr.count; |
| 1194 | sfp->hdr.i8count = 0; |
| 1195 | ino = XFS_DIR2_SF_GET_INUMBER(oldsfp, &oldsfp->hdr.parent); |
| 1196 | XFS_DIR2_SF_PUT_INUMBER(sfp, &ino, &sfp->hdr.parent); |
| 1197 | /* |
| 1198 | * Copy the entries field by field. |
| 1199 | */ |
| 1200 | for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp), |
| 1201 | oldsfep = XFS_DIR2_SF_FIRSTENTRY(oldsfp); |
| 1202 | i < sfp->hdr.count; |
| 1203 | i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep), |
| 1204 | oldsfep = XFS_DIR2_SF_NEXTENTRY(oldsfp, oldsfep)) { |
| 1205 | sfep->namelen = oldsfep->namelen; |
| 1206 | sfep->offset = oldsfep->offset; |
| 1207 | memcpy(sfep->name, oldsfep->name, sfep->namelen); |
| 1208 | ino = XFS_DIR2_SF_GET_INUMBER(oldsfp, |
| 1209 | XFS_DIR2_SF_INUMBERP(oldsfep)); |
| 1210 | XFS_DIR2_SF_PUT_INUMBER(sfp, &ino, XFS_DIR2_SF_INUMBERP(sfep)); |
| 1211 | } |
| 1212 | /* |
| 1213 | * Clean up the inode. |
| 1214 | */ |
| 1215 | kmem_free(buf, oldsize); |
| 1216 | dp->i_d.di_size = newsize; |
| 1217 | xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA); |
| 1218 | } |
| 1219 | |
| 1220 | /* |
| 1221 | * Convert from 4-byte inode numbers to 8-byte inode numbers. |
| 1222 | * The new 8-byte inode number is not there yet, we leave with the |
| 1223 | * count 1 but no corresponding entry. |
| 1224 | */ |
| 1225 | static void |
| 1226 | xfs_dir2_sf_toino8( |
| 1227 | xfs_da_args_t *args) /* operation arguments */ |
| 1228 | { |
| 1229 | char *buf; /* old dir's buffer */ |
| 1230 | xfs_inode_t *dp; /* incore directory inode */ |
| 1231 | int i; /* entry index */ |
| 1232 | xfs_ino_t ino; /* entry inode number */ |
| 1233 | int newsize; /* new inode size */ |
| 1234 | xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */ |
| 1235 | xfs_dir2_sf_t *oldsfp; /* old sf directory */ |
| 1236 | int oldsize; /* old inode size */ |
| 1237 | xfs_dir2_sf_entry_t *sfep; /* new sf entry */ |
| 1238 | xfs_dir2_sf_t *sfp; /* new sf directory */ |
| 1239 | |
| 1240 | xfs_dir2_trace_args("sf_toino8", args); |
| 1241 | dp = args->dp; |
| 1242 | |
| 1243 | /* |
| 1244 | * Copy the old directory to the buffer. |
| 1245 | * Then nuke it from the inode, and add the new buffer to the inode. |
| 1246 | * Don't want xfs_idata_realloc copying the data here. |
| 1247 | */ |
| 1248 | oldsize = dp->i_df.if_bytes; |
| 1249 | buf = kmem_alloc(oldsize, KM_SLEEP); |
| 1250 | oldsfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; |
| 1251 | ASSERT(oldsfp->hdr.i8count == 0); |
| 1252 | memcpy(buf, oldsfp, oldsize); |
| 1253 | /* |
| 1254 | * Compute the new inode size. |
| 1255 | */ |
| 1256 | newsize = |
| 1257 | oldsize + |
| 1258 | (oldsfp->hdr.count + 1) * |
| 1259 | ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t)); |
| 1260 | xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK); |
| 1261 | xfs_idata_realloc(dp, newsize, XFS_DATA_FORK); |
| 1262 | /* |
| 1263 | * Reset our pointers, the data has moved. |
| 1264 | */ |
| 1265 | oldsfp = (xfs_dir2_sf_t *)buf; |
| 1266 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; |
| 1267 | /* |
| 1268 | * Fill in the new header. |
| 1269 | */ |
| 1270 | sfp->hdr.count = oldsfp->hdr.count; |
| 1271 | sfp->hdr.i8count = 1; |
| 1272 | ino = XFS_DIR2_SF_GET_INUMBER(oldsfp, &oldsfp->hdr.parent); |
| 1273 | XFS_DIR2_SF_PUT_INUMBER(sfp, &ino, &sfp->hdr.parent); |
| 1274 | /* |
| 1275 | * Copy the entries field by field. |
| 1276 | */ |
| 1277 | for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp), |
| 1278 | oldsfep = XFS_DIR2_SF_FIRSTENTRY(oldsfp); |
| 1279 | i < sfp->hdr.count; |
| 1280 | i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep), |
| 1281 | oldsfep = XFS_DIR2_SF_NEXTENTRY(oldsfp, oldsfep)) { |
| 1282 | sfep->namelen = oldsfep->namelen; |
| 1283 | sfep->offset = oldsfep->offset; |
| 1284 | memcpy(sfep->name, oldsfep->name, sfep->namelen); |
| 1285 | ino = XFS_DIR2_SF_GET_INUMBER(oldsfp, |
| 1286 | XFS_DIR2_SF_INUMBERP(oldsfep)); |
| 1287 | XFS_DIR2_SF_PUT_INUMBER(sfp, &ino, XFS_DIR2_SF_INUMBERP(sfep)); |
| 1288 | } |
| 1289 | /* |
| 1290 | * Clean up the inode. |
| 1291 | */ |
| 1292 | kmem_free(buf, oldsize); |
| 1293 | dp->i_d.di_size = newsize; |
| 1294 | xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA); |
| 1295 | } |
| 1296 | #endif /* XFS_BIG_INUMS */ |