Commit | Line | Data |
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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
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 | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
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. | |
1da177e4 | 13 | * |
7b718769 NS |
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 | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
a844f451 | 19 | #include "xfs_fs.h" |
1da177e4 | 20 | #include "xfs_types.h" |
1da177e4 LT |
21 | #include "xfs_log.h" |
22 | #include "xfs_trans.h" | |
23 | #include "xfs_sb.h" | |
da353b0d | 24 | #include "xfs_ag.h" |
1da177e4 | 25 | #include "xfs_mount.h" |
a844f451 | 26 | #include "xfs_da_btree.h" |
1da177e4 | 27 | #include "xfs_bmap_btree.h" |
1da177e4 LT |
28 | #include "xfs_dinode.h" |
29 | #include "xfs_inode.h" | |
57926640 CH |
30 | #include "xfs_dir2_format.h" |
31 | #include "xfs_dir2_priv.h" | |
1da177e4 LT |
32 | #include "xfs_error.h" |
33 | ||
c2066e26 CH |
34 | STATIC xfs_dir2_data_free_t * |
35 | xfs_dir2_data_freefind(xfs_dir2_data_hdr_t *hdr, xfs_dir2_data_unused_t *dup); | |
36 | ||
1da177e4 LT |
37 | /* |
38 | * Check the consistency of the data block. | |
39 | * The input can also be a block-format directory. | |
82025d7f | 40 | * Return 0 is the buffer is good, otherwise an error. |
1da177e4 | 41 | */ |
82025d7f DC |
42 | int |
43 | __xfs_dir2_data_check( | |
1d9025e5 DC |
44 | struct xfs_inode *dp, /* incore inode pointer */ |
45 | struct xfs_buf *bp) /* data block's buffer */ | |
1da177e4 LT |
46 | { |
47 | xfs_dir2_dataptr_t addr; /* addr for leaf lookup */ | |
48 | xfs_dir2_data_free_t *bf; /* bestfree table */ | |
49 | xfs_dir2_block_tail_t *btp=NULL; /* block tail */ | |
50 | int count; /* count of entries found */ | |
c2066e26 | 51 | xfs_dir2_data_hdr_t *hdr; /* data block header */ |
1da177e4 LT |
52 | xfs_dir2_data_entry_t *dep; /* data entry */ |
53 | xfs_dir2_data_free_t *dfp; /* bestfree entry */ | |
54 | xfs_dir2_data_unused_t *dup; /* unused entry */ | |
55 | char *endp; /* end of useful data */ | |
56 | int freeseen; /* mask of bestfrees seen */ | |
57 | xfs_dahash_t hash; /* hash of current name */ | |
58 | int i; /* leaf index */ | |
59 | int lastfree; /* last entry was unused */ | |
60 | xfs_dir2_leaf_entry_t *lep=NULL; /* block leaf entries */ | |
61 | xfs_mount_t *mp; /* filesystem mount point */ | |
62 | char *p; /* current data position */ | |
63 | int stale; /* count of stale leaves */ | |
5163f95a | 64 | struct xfs_name name; |
1da177e4 | 65 | |
82025d7f | 66 | mp = bp->b_target->bt_mount; |
1d9025e5 | 67 | hdr = bp->b_addr; |
c2066e26 | 68 | bf = hdr->bestfree; |
0ba9cd84 | 69 | p = (char *)(hdr + 1); |
c2066e26 | 70 | |
82025d7f DC |
71 | switch (hdr->magic) { |
72 | case cpu_to_be32(XFS_DIR2_BLOCK_MAGIC): | |
c2066e26 | 73 | btp = xfs_dir2_block_tail_p(mp, hdr); |
bbaaf538 | 74 | lep = xfs_dir2_block_leaf_p(btp); |
1da177e4 | 75 | endp = (char *)lep; |
82025d7f DC |
76 | break; |
77 | case cpu_to_be32(XFS_DIR2_DATA_MAGIC): | |
c2066e26 | 78 | endp = (char *)hdr + mp->m_dirblksize; |
82025d7f DC |
79 | break; |
80 | default: | |
81 | XFS_ERROR_REPORT("Bad Magic", XFS_ERRLEVEL_LOW, mp); | |
82 | return EFSCORRUPTED; | |
c2066e26 CH |
83 | } |
84 | ||
1da177e4 LT |
85 | count = lastfree = freeseen = 0; |
86 | /* | |
87 | * Account for zero bestfree entries. | |
88 | */ | |
89 | if (!bf[0].length) { | |
82025d7f | 90 | XFS_WANT_CORRUPTED_RETURN(!bf[0].offset); |
1da177e4 LT |
91 | freeseen |= 1 << 0; |
92 | } | |
93 | if (!bf[1].length) { | |
82025d7f | 94 | XFS_WANT_CORRUPTED_RETURN(!bf[1].offset); |
1da177e4 LT |
95 | freeseen |= 1 << 1; |
96 | } | |
97 | if (!bf[2].length) { | |
82025d7f | 98 | XFS_WANT_CORRUPTED_RETURN(!bf[2].offset); |
1da177e4 LT |
99 | freeseen |= 1 << 2; |
100 | } | |
82025d7f DC |
101 | |
102 | XFS_WANT_CORRUPTED_RETURN(be16_to_cpu(bf[0].length) >= | |
103 | be16_to_cpu(bf[1].length)); | |
104 | XFS_WANT_CORRUPTED_RETURN(be16_to_cpu(bf[1].length) >= | |
105 | be16_to_cpu(bf[2].length)); | |
1da177e4 LT |
106 | /* |
107 | * Loop over the data/unused entries. | |
108 | */ | |
109 | while (p < endp) { | |
110 | dup = (xfs_dir2_data_unused_t *)p; | |
111 | /* | |
112 | * If it's unused, look for the space in the bestfree table. | |
113 | * If we find it, account for that, else make sure it | |
114 | * doesn't need to be there. | |
115 | */ | |
ad354eb3 | 116 | if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) { |
82025d7f DC |
117 | XFS_WANT_CORRUPTED_RETURN(lastfree == 0); |
118 | XFS_WANT_CORRUPTED_RETURN( | |
119 | be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup)) == | |
120 | (char *)dup - (char *)hdr); | |
c2066e26 | 121 | dfp = xfs_dir2_data_freefind(hdr, dup); |
1da177e4 LT |
122 | if (dfp) { |
123 | i = (int)(dfp - bf); | |
82025d7f DC |
124 | XFS_WANT_CORRUPTED_RETURN( |
125 | (freeseen & (1 << i)) == 0); | |
1da177e4 | 126 | freeseen |= 1 << i; |
70e73f59 | 127 | } else { |
82025d7f DC |
128 | XFS_WANT_CORRUPTED_RETURN( |
129 | be16_to_cpu(dup->length) <= | |
130 | be16_to_cpu(bf[2].length)); | |
70e73f59 | 131 | } |
ad354eb3 | 132 | p += be16_to_cpu(dup->length); |
1da177e4 LT |
133 | lastfree = 1; |
134 | continue; | |
135 | } | |
136 | /* | |
137 | * It's a real entry. Validate the fields. | |
138 | * If this is a block directory then make sure it's | |
139 | * in the leaf section of the block. | |
140 | * The linear search is crude but this is DEBUG code. | |
141 | */ | |
142 | dep = (xfs_dir2_data_entry_t *)p; | |
82025d7f DC |
143 | XFS_WANT_CORRUPTED_RETURN(dep->namelen != 0); |
144 | XFS_WANT_CORRUPTED_RETURN( | |
145 | !xfs_dir_ino_validate(mp, be64_to_cpu(dep->inumber))); | |
146 | XFS_WANT_CORRUPTED_RETURN( | |
147 | be16_to_cpu(*xfs_dir2_data_entry_tag_p(dep)) == | |
148 | (char *)dep - (char *)hdr); | |
1da177e4 LT |
149 | count++; |
150 | lastfree = 0; | |
69ef921b | 151 | if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC)) { |
bbaaf538 | 152 | addr = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk, |
1da177e4 | 153 | (xfs_dir2_data_aoff_t) |
c2066e26 | 154 | ((char *)dep - (char *)hdr)); |
5163f95a BN |
155 | name.name = dep->name; |
156 | name.len = dep->namelen; | |
157 | hash = mp->m_dirnameops->hashname(&name); | |
e922fffa | 158 | for (i = 0; i < be32_to_cpu(btp->count); i++) { |
3c1f9c15 NS |
159 | if (be32_to_cpu(lep[i].address) == addr && |
160 | be32_to_cpu(lep[i].hashval) == hash) | |
1da177e4 LT |
161 | break; |
162 | } | |
82025d7f | 163 | XFS_WANT_CORRUPTED_RETURN(i < be32_to_cpu(btp->count)); |
1da177e4 | 164 | } |
bbaaf538 | 165 | p += xfs_dir2_data_entsize(dep->namelen); |
1da177e4 LT |
166 | } |
167 | /* | |
168 | * Need to have seen all the entries and all the bestfree slots. | |
169 | */ | |
82025d7f | 170 | XFS_WANT_CORRUPTED_RETURN(freeseen == 7); |
69ef921b | 171 | if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC)) { |
e922fffa | 172 | for (i = stale = 0; i < be32_to_cpu(btp->count); i++) { |
69ef921b CH |
173 | if (lep[i].address == |
174 | cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) | |
1da177e4 LT |
175 | stale++; |
176 | if (i > 0) | |
82025d7f DC |
177 | XFS_WANT_CORRUPTED_RETURN( |
178 | be32_to_cpu(lep[i].hashval) >= | |
179 | be32_to_cpu(lep[i - 1].hashval)); | |
1da177e4 | 180 | } |
82025d7f DC |
181 | XFS_WANT_CORRUPTED_RETURN(count == |
182 | be32_to_cpu(btp->count) - be32_to_cpu(btp->stale)); | |
183 | XFS_WANT_CORRUPTED_RETURN(stale == be32_to_cpu(btp->stale)); | |
1da177e4 | 184 | } |
82025d7f | 185 | return 0; |
1da177e4 | 186 | } |
1da177e4 LT |
187 | |
188 | /* | |
189 | * Given a data block and an unused entry from that block, | |
190 | * return the bestfree entry if any that corresponds to it. | |
191 | */ | |
c2066e26 | 192 | STATIC xfs_dir2_data_free_t * |
1da177e4 | 193 | xfs_dir2_data_freefind( |
c2066e26 | 194 | xfs_dir2_data_hdr_t *hdr, /* data block */ |
1da177e4 LT |
195 | xfs_dir2_data_unused_t *dup) /* data unused entry */ |
196 | { | |
197 | xfs_dir2_data_free_t *dfp; /* bestfree entry */ | |
198 | xfs_dir2_data_aoff_t off; /* offset value needed */ | |
199 | #if defined(DEBUG) && defined(__KERNEL__) | |
200 | int matched; /* matched the value */ | |
201 | int seenzero; /* saw a 0 bestfree entry */ | |
202 | #endif | |
203 | ||
c2066e26 | 204 | off = (xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr); |
1da177e4 LT |
205 | #if defined(DEBUG) && defined(__KERNEL__) |
206 | /* | |
207 | * Validate some consistency in the bestfree table. | |
208 | * Check order, non-overlapping entries, and if we find the | |
209 | * one we're looking for it has to be exact. | |
210 | */ | |
69ef921b CH |
211 | ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || |
212 | hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC)); | |
c2066e26 CH |
213 | for (dfp = &hdr->bestfree[0], seenzero = matched = 0; |
214 | dfp < &hdr->bestfree[XFS_DIR2_DATA_FD_COUNT]; | |
1da177e4 LT |
215 | dfp++) { |
216 | if (!dfp->offset) { | |
217 | ASSERT(!dfp->length); | |
218 | seenzero = 1; | |
219 | continue; | |
220 | } | |
221 | ASSERT(seenzero == 0); | |
70e73f59 | 222 | if (be16_to_cpu(dfp->offset) == off) { |
1da177e4 | 223 | matched = 1; |
ad354eb3 | 224 | ASSERT(dfp->length == dup->length); |
70e73f59 | 225 | } else if (off < be16_to_cpu(dfp->offset)) |
ad354eb3 | 226 | ASSERT(off + be16_to_cpu(dup->length) <= be16_to_cpu(dfp->offset)); |
1da177e4 | 227 | else |
70e73f59 | 228 | ASSERT(be16_to_cpu(dfp->offset) + be16_to_cpu(dfp->length) <= off); |
ad354eb3 | 229 | ASSERT(matched || be16_to_cpu(dfp->length) >= be16_to_cpu(dup->length)); |
c2066e26 | 230 | if (dfp > &hdr->bestfree[0]) |
70e73f59 | 231 | ASSERT(be16_to_cpu(dfp[-1].length) >= be16_to_cpu(dfp[0].length)); |
1da177e4 LT |
232 | } |
233 | #endif | |
234 | /* | |
235 | * If this is smaller than the smallest bestfree entry, | |
236 | * it can't be there since they're sorted. | |
237 | */ | |
ad354eb3 | 238 | if (be16_to_cpu(dup->length) < |
c2066e26 | 239 | be16_to_cpu(hdr->bestfree[XFS_DIR2_DATA_FD_COUNT - 1].length)) |
1da177e4 LT |
240 | return NULL; |
241 | /* | |
242 | * Look at the three bestfree entries for our guy. | |
243 | */ | |
c2066e26 CH |
244 | for (dfp = &hdr->bestfree[0]; |
245 | dfp < &hdr->bestfree[XFS_DIR2_DATA_FD_COUNT]; | |
1da177e4 LT |
246 | dfp++) { |
247 | if (!dfp->offset) | |
248 | return NULL; | |
70e73f59 | 249 | if (be16_to_cpu(dfp->offset) == off) |
1da177e4 LT |
250 | return dfp; |
251 | } | |
252 | /* | |
253 | * Didn't find it. This only happens if there are duplicate lengths. | |
254 | */ | |
255 | return NULL; | |
256 | } | |
257 | ||
258 | /* | |
259 | * Insert an unused-space entry into the bestfree table. | |
260 | */ | |
261 | xfs_dir2_data_free_t * /* entry inserted */ | |
262 | xfs_dir2_data_freeinsert( | |
c2066e26 | 263 | xfs_dir2_data_hdr_t *hdr, /* data block pointer */ |
1da177e4 LT |
264 | xfs_dir2_data_unused_t *dup, /* unused space */ |
265 | int *loghead) /* log the data header (out) */ | |
266 | { | |
267 | xfs_dir2_data_free_t *dfp; /* bestfree table pointer */ | |
268 | xfs_dir2_data_free_t new; /* new bestfree entry */ | |
269 | ||
270 | #ifdef __KERNEL__ | |
69ef921b CH |
271 | ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || |
272 | hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC)); | |
1da177e4 | 273 | #endif |
c2066e26 | 274 | dfp = hdr->bestfree; |
70e73f59 | 275 | new.length = dup->length; |
c2066e26 CH |
276 | new.offset = cpu_to_be16((char *)dup - (char *)hdr); |
277 | ||
1da177e4 LT |
278 | /* |
279 | * Insert at position 0, 1, or 2; or not at all. | |
280 | */ | |
70e73f59 | 281 | if (be16_to_cpu(new.length) > be16_to_cpu(dfp[0].length)) { |
1da177e4 LT |
282 | dfp[2] = dfp[1]; |
283 | dfp[1] = dfp[0]; | |
284 | dfp[0] = new; | |
285 | *loghead = 1; | |
286 | return &dfp[0]; | |
287 | } | |
70e73f59 | 288 | if (be16_to_cpu(new.length) > be16_to_cpu(dfp[1].length)) { |
1da177e4 LT |
289 | dfp[2] = dfp[1]; |
290 | dfp[1] = new; | |
291 | *loghead = 1; | |
292 | return &dfp[1]; | |
293 | } | |
70e73f59 | 294 | if (be16_to_cpu(new.length) > be16_to_cpu(dfp[2].length)) { |
1da177e4 LT |
295 | dfp[2] = new; |
296 | *loghead = 1; | |
297 | return &dfp[2]; | |
298 | } | |
299 | return NULL; | |
300 | } | |
301 | ||
302 | /* | |
303 | * Remove a bestfree entry from the table. | |
304 | */ | |
ba0f32d4 | 305 | STATIC void |
1da177e4 | 306 | xfs_dir2_data_freeremove( |
c2066e26 | 307 | xfs_dir2_data_hdr_t *hdr, /* data block header */ |
1da177e4 LT |
308 | xfs_dir2_data_free_t *dfp, /* bestfree entry pointer */ |
309 | int *loghead) /* out: log data header */ | |
310 | { | |
311 | #ifdef __KERNEL__ | |
69ef921b CH |
312 | ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || |
313 | hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC)); | |
1da177e4 LT |
314 | #endif |
315 | /* | |
316 | * It's the first entry, slide the next 2 up. | |
317 | */ | |
c2066e26 CH |
318 | if (dfp == &hdr->bestfree[0]) { |
319 | hdr->bestfree[0] = hdr->bestfree[1]; | |
320 | hdr->bestfree[1] = hdr->bestfree[2]; | |
1da177e4 LT |
321 | } |
322 | /* | |
323 | * It's the second entry, slide the 3rd entry up. | |
324 | */ | |
c2066e26 CH |
325 | else if (dfp == &hdr->bestfree[1]) |
326 | hdr->bestfree[1] = hdr->bestfree[2]; | |
1da177e4 LT |
327 | /* |
328 | * Must be the last entry. | |
329 | */ | |
330 | else | |
c2066e26 | 331 | ASSERT(dfp == &hdr->bestfree[2]); |
1da177e4 LT |
332 | /* |
333 | * Clear the 3rd entry, must be zero now. | |
334 | */ | |
c2066e26 CH |
335 | hdr->bestfree[2].length = 0; |
336 | hdr->bestfree[2].offset = 0; | |
1da177e4 LT |
337 | *loghead = 1; |
338 | } | |
339 | ||
340 | /* | |
341 | * Given a data block, reconstruct its bestfree map. | |
342 | */ | |
343 | void | |
344 | xfs_dir2_data_freescan( | |
345 | xfs_mount_t *mp, /* filesystem mount point */ | |
c2066e26 | 346 | xfs_dir2_data_hdr_t *hdr, /* data block header */ |
ef497f8a | 347 | int *loghead) /* out: log data header */ |
1da177e4 LT |
348 | { |
349 | xfs_dir2_block_tail_t *btp; /* block tail */ | |
350 | xfs_dir2_data_entry_t *dep; /* active data entry */ | |
351 | xfs_dir2_data_unused_t *dup; /* unused data entry */ | |
352 | char *endp; /* end of block's data */ | |
353 | char *p; /* current entry pointer */ | |
354 | ||
355 | #ifdef __KERNEL__ | |
69ef921b CH |
356 | ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || |
357 | hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC)); | |
1da177e4 LT |
358 | #endif |
359 | /* | |
360 | * Start by clearing the table. | |
361 | */ | |
c2066e26 | 362 | memset(hdr->bestfree, 0, sizeof(hdr->bestfree)); |
1da177e4 LT |
363 | *loghead = 1; |
364 | /* | |
365 | * Set up pointers. | |
366 | */ | |
0ba9cd84 | 367 | p = (char *)(hdr + 1); |
69ef921b | 368 | if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC)) { |
c2066e26 | 369 | btp = xfs_dir2_block_tail_p(mp, hdr); |
bbaaf538 | 370 | endp = (char *)xfs_dir2_block_leaf_p(btp); |
1da177e4 | 371 | } else |
c2066e26 | 372 | endp = (char *)hdr + mp->m_dirblksize; |
1da177e4 LT |
373 | /* |
374 | * Loop over the block's entries. | |
375 | */ | |
376 | while (p < endp) { | |
377 | dup = (xfs_dir2_data_unused_t *)p; | |
378 | /* | |
379 | * If it's a free entry, insert it. | |
380 | */ | |
ad354eb3 | 381 | if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) { |
c2066e26 | 382 | ASSERT((char *)dup - (char *)hdr == |
bbaaf538 | 383 | be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup))); |
c2066e26 | 384 | xfs_dir2_data_freeinsert(hdr, dup, loghead); |
ad354eb3 | 385 | p += be16_to_cpu(dup->length); |
1da177e4 LT |
386 | } |
387 | /* | |
388 | * For active entries, check their tags and skip them. | |
389 | */ | |
390 | else { | |
391 | dep = (xfs_dir2_data_entry_t *)p; | |
c2066e26 | 392 | ASSERT((char *)dep - (char *)hdr == |
bbaaf538 CH |
393 | be16_to_cpu(*xfs_dir2_data_entry_tag_p(dep))); |
394 | p += xfs_dir2_data_entsize(dep->namelen); | |
1da177e4 LT |
395 | } |
396 | } | |
397 | } | |
398 | ||
399 | /* | |
400 | * Initialize a data block at the given block number in the directory. | |
401 | * Give back the buffer for the created block. | |
402 | */ | |
403 | int /* error */ | |
404 | xfs_dir2_data_init( | |
405 | xfs_da_args_t *args, /* directory operation args */ | |
406 | xfs_dir2_db_t blkno, /* logical dir block number */ | |
1d9025e5 | 407 | struct xfs_buf **bpp) /* output block buffer */ |
1da177e4 | 408 | { |
1d9025e5 | 409 | struct xfs_buf *bp; /* block buffer */ |
c2066e26 | 410 | xfs_dir2_data_hdr_t *hdr; /* data block header */ |
1da177e4 LT |
411 | xfs_inode_t *dp; /* incore directory inode */ |
412 | xfs_dir2_data_unused_t *dup; /* unused entry pointer */ | |
413 | int error; /* error return value */ | |
414 | int i; /* bestfree index */ | |
415 | xfs_mount_t *mp; /* filesystem mount point */ | |
416 | xfs_trans_t *tp; /* transaction pointer */ | |
417 | int t; /* temp */ | |
418 | ||
419 | dp = args->dp; | |
420 | mp = dp->i_mount; | |
421 | tp = args->trans; | |
422 | /* | |
423 | * Get the buffer set up for the block. | |
424 | */ | |
bbaaf538 | 425 | error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(mp, blkno), -1, &bp, |
1da177e4 LT |
426 | XFS_DATA_FORK); |
427 | if (error) { | |
428 | return error; | |
429 | } | |
430 | ASSERT(bp != NULL); | |
c2066e26 | 431 | |
1da177e4 LT |
432 | /* |
433 | * Initialize the header. | |
434 | */ | |
1d9025e5 | 435 | hdr = bp->b_addr; |
c2066e26 CH |
436 | hdr->magic = cpu_to_be32(XFS_DIR2_DATA_MAGIC); |
437 | hdr->bestfree[0].offset = cpu_to_be16(sizeof(*hdr)); | |
1da177e4 | 438 | for (i = 1; i < XFS_DIR2_DATA_FD_COUNT; i++) { |
c2066e26 CH |
439 | hdr->bestfree[i].length = 0; |
440 | hdr->bestfree[i].offset = 0; | |
1da177e4 | 441 | } |
c2066e26 | 442 | |
1da177e4 LT |
443 | /* |
444 | * Set up an unused entry for the block's body. | |
445 | */ | |
0ba9cd84 | 446 | dup = (xfs_dir2_data_unused_t *)(hdr + 1); |
ad354eb3 | 447 | dup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG); |
1da177e4 | 448 | |
c2066e26 CH |
449 | t = mp->m_dirblksize - (uint)sizeof(*hdr); |
450 | hdr->bestfree[0].length = cpu_to_be16(t); | |
ad354eb3 | 451 | dup->length = cpu_to_be16(t); |
c2066e26 | 452 | *xfs_dir2_data_unused_tag_p(dup) = cpu_to_be16((char *)dup - (char *)hdr); |
1da177e4 LT |
453 | /* |
454 | * Log it and return it. | |
455 | */ | |
456 | xfs_dir2_data_log_header(tp, bp); | |
457 | xfs_dir2_data_log_unused(tp, bp, dup); | |
458 | *bpp = bp; | |
459 | return 0; | |
460 | } | |
461 | ||
462 | /* | |
463 | * Log an active data entry from the block. | |
464 | */ | |
465 | void | |
466 | xfs_dir2_data_log_entry( | |
1d9025e5 DC |
467 | struct xfs_trans *tp, |
468 | struct xfs_buf *bp, | |
1da177e4 LT |
469 | xfs_dir2_data_entry_t *dep) /* data entry pointer */ |
470 | { | |
1d9025e5 | 471 | xfs_dir2_data_hdr_t *hdr = bp->b_addr; |
1da177e4 | 472 | |
69ef921b CH |
473 | ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || |
474 | hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC)); | |
c2066e26 | 475 | |
1d9025e5 | 476 | xfs_trans_log_buf(tp, bp, (uint)((char *)dep - (char *)hdr), |
bbaaf538 | 477 | (uint)((char *)(xfs_dir2_data_entry_tag_p(dep) + 1) - |
c2066e26 | 478 | (char *)hdr - 1)); |
1da177e4 LT |
479 | } |
480 | ||
481 | /* | |
482 | * Log a data block header. | |
483 | */ | |
484 | void | |
485 | xfs_dir2_data_log_header( | |
1d9025e5 DC |
486 | struct xfs_trans *tp, |
487 | struct xfs_buf *bp) | |
1da177e4 | 488 | { |
1d9025e5 | 489 | xfs_dir2_data_hdr_t *hdr = bp->b_addr; |
1da177e4 | 490 | |
69ef921b CH |
491 | ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || |
492 | hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC)); | |
c2066e26 | 493 | |
1d9025e5 | 494 | xfs_trans_log_buf(tp, bp, 0, sizeof(*hdr) - 1); |
1da177e4 LT |
495 | } |
496 | ||
497 | /* | |
498 | * Log a data unused entry. | |
499 | */ | |
500 | void | |
501 | xfs_dir2_data_log_unused( | |
1d9025e5 DC |
502 | struct xfs_trans *tp, |
503 | struct xfs_buf *bp, | |
1da177e4 LT |
504 | xfs_dir2_data_unused_t *dup) /* data unused pointer */ |
505 | { | |
1d9025e5 | 506 | xfs_dir2_data_hdr_t *hdr = bp->b_addr; |
c2066e26 | 507 | |
69ef921b CH |
508 | ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || |
509 | hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC)); | |
1da177e4 | 510 | |
1da177e4 LT |
511 | /* |
512 | * Log the first part of the unused entry. | |
513 | */ | |
1d9025e5 | 514 | xfs_trans_log_buf(tp, bp, (uint)((char *)dup - (char *)hdr), |
1da177e4 | 515 | (uint)((char *)&dup->length + sizeof(dup->length) - |
c2066e26 | 516 | 1 - (char *)hdr)); |
1da177e4 LT |
517 | /* |
518 | * Log the end (tag) of the unused entry. | |
519 | */ | |
1d9025e5 | 520 | xfs_trans_log_buf(tp, bp, |
c2066e26 CH |
521 | (uint)((char *)xfs_dir2_data_unused_tag_p(dup) - (char *)hdr), |
522 | (uint)((char *)xfs_dir2_data_unused_tag_p(dup) - (char *)hdr + | |
1da177e4 LT |
523 | sizeof(xfs_dir2_data_off_t) - 1)); |
524 | } | |
525 | ||
526 | /* | |
527 | * Make a byte range in the data block unused. | |
528 | * Its current contents are unimportant. | |
529 | */ | |
530 | void | |
531 | xfs_dir2_data_make_free( | |
1d9025e5 DC |
532 | struct xfs_trans *tp, |
533 | struct xfs_buf *bp, | |
1da177e4 LT |
534 | xfs_dir2_data_aoff_t offset, /* starting byte offset */ |
535 | xfs_dir2_data_aoff_t len, /* length in bytes */ | |
536 | int *needlogp, /* out: log header */ | |
537 | int *needscanp) /* out: regen bestfree */ | |
538 | { | |
c2066e26 | 539 | xfs_dir2_data_hdr_t *hdr; /* data block pointer */ |
1da177e4 LT |
540 | xfs_dir2_data_free_t *dfp; /* bestfree pointer */ |
541 | char *endptr; /* end of data area */ | |
542 | xfs_mount_t *mp; /* filesystem mount point */ | |
543 | int needscan; /* need to regen bestfree */ | |
544 | xfs_dir2_data_unused_t *newdup; /* new unused entry */ | |
545 | xfs_dir2_data_unused_t *postdup; /* unused entry after us */ | |
546 | xfs_dir2_data_unused_t *prevdup; /* unused entry before us */ | |
547 | ||
548 | mp = tp->t_mountp; | |
1d9025e5 | 549 | hdr = bp->b_addr; |
c2066e26 | 550 | |
1da177e4 LT |
551 | /* |
552 | * Figure out where the end of the data area is. | |
553 | */ | |
69ef921b | 554 | if (hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC)) |
c2066e26 | 555 | endptr = (char *)hdr + mp->m_dirblksize; |
1da177e4 LT |
556 | else { |
557 | xfs_dir2_block_tail_t *btp; /* block tail */ | |
558 | ||
69ef921b | 559 | ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC)); |
c2066e26 | 560 | btp = xfs_dir2_block_tail_p(mp, hdr); |
bbaaf538 | 561 | endptr = (char *)xfs_dir2_block_leaf_p(btp); |
1da177e4 LT |
562 | } |
563 | /* | |
564 | * If this isn't the start of the block, then back up to | |
565 | * the previous entry and see if it's free. | |
566 | */ | |
c2066e26 | 567 | if (offset > sizeof(*hdr)) { |
3d693c6e | 568 | __be16 *tagp; /* tag just before us */ |
1da177e4 | 569 | |
c2066e26 CH |
570 | tagp = (__be16 *)((char *)hdr + offset) - 1; |
571 | prevdup = (xfs_dir2_data_unused_t *)((char *)hdr + be16_to_cpu(*tagp)); | |
ad354eb3 | 572 | if (be16_to_cpu(prevdup->freetag) != XFS_DIR2_DATA_FREE_TAG) |
1da177e4 LT |
573 | prevdup = NULL; |
574 | } else | |
575 | prevdup = NULL; | |
576 | /* | |
577 | * If this isn't the end of the block, see if the entry after | |
578 | * us is free. | |
579 | */ | |
c2066e26 | 580 | if ((char *)hdr + offset + len < endptr) { |
1da177e4 | 581 | postdup = |
c2066e26 | 582 | (xfs_dir2_data_unused_t *)((char *)hdr + offset + len); |
ad354eb3 | 583 | if (be16_to_cpu(postdup->freetag) != XFS_DIR2_DATA_FREE_TAG) |
1da177e4 LT |
584 | postdup = NULL; |
585 | } else | |
586 | postdup = NULL; | |
587 | ASSERT(*needscanp == 0); | |
588 | needscan = 0; | |
589 | /* | |
590 | * Previous and following entries are both free, | |
591 | * merge everything into a single free entry. | |
592 | */ | |
593 | if (prevdup && postdup) { | |
594 | xfs_dir2_data_free_t *dfp2; /* another bestfree pointer */ | |
595 | ||
596 | /* | |
597 | * See if prevdup and/or postdup are in bestfree table. | |
598 | */ | |
c2066e26 CH |
599 | dfp = xfs_dir2_data_freefind(hdr, prevdup); |
600 | dfp2 = xfs_dir2_data_freefind(hdr, postdup); | |
1da177e4 LT |
601 | /* |
602 | * We need a rescan unless there are exactly 2 free entries | |
603 | * namely our two. Then we know what's happening, otherwise | |
604 | * since the third bestfree is there, there might be more | |
605 | * entries. | |
606 | */ | |
c2066e26 | 607 | needscan = (hdr->bestfree[2].length != 0); |
1da177e4 LT |
608 | /* |
609 | * Fix up the new big freespace. | |
610 | */ | |
413d57c9 | 611 | be16_add_cpu(&prevdup->length, len + be16_to_cpu(postdup->length)); |
bbaaf538 | 612 | *xfs_dir2_data_unused_tag_p(prevdup) = |
c2066e26 | 613 | cpu_to_be16((char *)prevdup - (char *)hdr); |
1da177e4 LT |
614 | xfs_dir2_data_log_unused(tp, bp, prevdup); |
615 | if (!needscan) { | |
616 | /* | |
617 | * Has to be the case that entries 0 and 1 are | |
618 | * dfp and dfp2 (don't know which is which), and | |
619 | * entry 2 is empty. | |
620 | * Remove entry 1 first then entry 0. | |
621 | */ | |
622 | ASSERT(dfp && dfp2); | |
c2066e26 CH |
623 | if (dfp == &hdr->bestfree[1]) { |
624 | dfp = &hdr->bestfree[0]; | |
1da177e4 | 625 | ASSERT(dfp2 == dfp); |
c2066e26 | 626 | dfp2 = &hdr->bestfree[1]; |
1da177e4 | 627 | } |
c2066e26 CH |
628 | xfs_dir2_data_freeremove(hdr, dfp2, needlogp); |
629 | xfs_dir2_data_freeremove(hdr, dfp, needlogp); | |
1da177e4 LT |
630 | /* |
631 | * Now insert the new entry. | |
632 | */ | |
c2066e26 CH |
633 | dfp = xfs_dir2_data_freeinsert(hdr, prevdup, needlogp); |
634 | ASSERT(dfp == &hdr->bestfree[0]); | |
ad354eb3 | 635 | ASSERT(dfp->length == prevdup->length); |
1da177e4 LT |
636 | ASSERT(!dfp[1].length); |
637 | ASSERT(!dfp[2].length); | |
638 | } | |
639 | } | |
640 | /* | |
641 | * The entry before us is free, merge with it. | |
642 | */ | |
643 | else if (prevdup) { | |
c2066e26 | 644 | dfp = xfs_dir2_data_freefind(hdr, prevdup); |
413d57c9 | 645 | be16_add_cpu(&prevdup->length, len); |
bbaaf538 | 646 | *xfs_dir2_data_unused_tag_p(prevdup) = |
c2066e26 | 647 | cpu_to_be16((char *)prevdup - (char *)hdr); |
1da177e4 LT |
648 | xfs_dir2_data_log_unused(tp, bp, prevdup); |
649 | /* | |
650 | * If the previous entry was in the table, the new entry | |
651 | * is longer, so it will be in the table too. Remove | |
652 | * the old one and add the new one. | |
653 | */ | |
654 | if (dfp) { | |
c2066e26 CH |
655 | xfs_dir2_data_freeremove(hdr, dfp, needlogp); |
656 | xfs_dir2_data_freeinsert(hdr, prevdup, needlogp); | |
1da177e4 LT |
657 | } |
658 | /* | |
659 | * Otherwise we need a scan if the new entry is big enough. | |
660 | */ | |
70e73f59 | 661 | else { |
ad354eb3 | 662 | needscan = be16_to_cpu(prevdup->length) > |
c2066e26 | 663 | be16_to_cpu(hdr->bestfree[2].length); |
70e73f59 | 664 | } |
1da177e4 LT |
665 | } |
666 | /* | |
667 | * The following entry is free, merge with it. | |
668 | */ | |
669 | else if (postdup) { | |
c2066e26 CH |
670 | dfp = xfs_dir2_data_freefind(hdr, postdup); |
671 | newdup = (xfs_dir2_data_unused_t *)((char *)hdr + offset); | |
ad354eb3 NS |
672 | newdup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG); |
673 | newdup->length = cpu_to_be16(len + be16_to_cpu(postdup->length)); | |
bbaaf538 | 674 | *xfs_dir2_data_unused_tag_p(newdup) = |
c2066e26 | 675 | cpu_to_be16((char *)newdup - (char *)hdr); |
1da177e4 LT |
676 | xfs_dir2_data_log_unused(tp, bp, newdup); |
677 | /* | |
678 | * If the following entry was in the table, the new entry | |
679 | * is longer, so it will be in the table too. Remove | |
680 | * the old one and add the new one. | |
681 | */ | |
682 | if (dfp) { | |
c2066e26 CH |
683 | xfs_dir2_data_freeremove(hdr, dfp, needlogp); |
684 | xfs_dir2_data_freeinsert(hdr, newdup, needlogp); | |
1da177e4 LT |
685 | } |
686 | /* | |
687 | * Otherwise we need a scan if the new entry is big enough. | |
688 | */ | |
70e73f59 | 689 | else { |
ad354eb3 | 690 | needscan = be16_to_cpu(newdup->length) > |
c2066e26 | 691 | be16_to_cpu(hdr->bestfree[2].length); |
70e73f59 | 692 | } |
1da177e4 LT |
693 | } |
694 | /* | |
695 | * Neither neighbor is free. Make a new entry. | |
696 | */ | |
697 | else { | |
c2066e26 | 698 | newdup = (xfs_dir2_data_unused_t *)((char *)hdr + offset); |
ad354eb3 NS |
699 | newdup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG); |
700 | newdup->length = cpu_to_be16(len); | |
bbaaf538 | 701 | *xfs_dir2_data_unused_tag_p(newdup) = |
c2066e26 | 702 | cpu_to_be16((char *)newdup - (char *)hdr); |
1da177e4 | 703 | xfs_dir2_data_log_unused(tp, bp, newdup); |
c2066e26 | 704 | xfs_dir2_data_freeinsert(hdr, newdup, needlogp); |
1da177e4 LT |
705 | } |
706 | *needscanp = needscan; | |
707 | } | |
708 | ||
709 | /* | |
710 | * Take a byte range out of an existing unused space and make it un-free. | |
711 | */ | |
712 | void | |
713 | xfs_dir2_data_use_free( | |
1d9025e5 DC |
714 | struct xfs_trans *tp, |
715 | struct xfs_buf *bp, | |
1da177e4 LT |
716 | xfs_dir2_data_unused_t *dup, /* unused entry */ |
717 | xfs_dir2_data_aoff_t offset, /* starting offset to use */ | |
718 | xfs_dir2_data_aoff_t len, /* length to use */ | |
719 | int *needlogp, /* out: need to log header */ | |
720 | int *needscanp) /* out: need regen bestfree */ | |
721 | { | |
c2066e26 | 722 | xfs_dir2_data_hdr_t *hdr; /* data block header */ |
1da177e4 LT |
723 | xfs_dir2_data_free_t *dfp; /* bestfree pointer */ |
724 | int matchback; /* matches end of freespace */ | |
725 | int matchfront; /* matches start of freespace */ | |
726 | int needscan; /* need to regen bestfree */ | |
727 | xfs_dir2_data_unused_t *newdup; /* new unused entry */ | |
728 | xfs_dir2_data_unused_t *newdup2; /* another new unused entry */ | |
729 | int oldlen; /* old unused entry's length */ | |
730 | ||
1d9025e5 | 731 | hdr = bp->b_addr; |
69ef921b CH |
732 | ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || |
733 | hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC)); | |
ad354eb3 | 734 | ASSERT(be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG); |
c2066e26 CH |
735 | ASSERT(offset >= (char *)dup - (char *)hdr); |
736 | ASSERT(offset + len <= (char *)dup + be16_to_cpu(dup->length) - (char *)hdr); | |
737 | ASSERT((char *)dup - (char *)hdr == be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup))); | |
1da177e4 LT |
738 | /* |
739 | * Look up the entry in the bestfree table. | |
740 | */ | |
c2066e26 | 741 | dfp = xfs_dir2_data_freefind(hdr, dup); |
ad354eb3 | 742 | oldlen = be16_to_cpu(dup->length); |
c2066e26 | 743 | ASSERT(dfp || oldlen <= be16_to_cpu(hdr->bestfree[2].length)); |
1da177e4 LT |
744 | /* |
745 | * Check for alignment with front and back of the entry. | |
746 | */ | |
c2066e26 CH |
747 | matchfront = (char *)dup - (char *)hdr == offset; |
748 | matchback = (char *)dup + oldlen - (char *)hdr == offset + len; | |
1da177e4 LT |
749 | ASSERT(*needscanp == 0); |
750 | needscan = 0; | |
751 | /* | |
752 | * If we matched it exactly we just need to get rid of it from | |
753 | * the bestfree table. | |
754 | */ | |
755 | if (matchfront && matchback) { | |
756 | if (dfp) { | |
c2066e26 | 757 | needscan = (hdr->bestfree[2].offset != 0); |
1da177e4 | 758 | if (!needscan) |
c2066e26 | 759 | xfs_dir2_data_freeremove(hdr, dfp, needlogp); |
1da177e4 LT |
760 | } |
761 | } | |
762 | /* | |
763 | * We match the first part of the entry. | |
764 | * Make a new entry with the remaining freespace. | |
765 | */ | |
766 | else if (matchfront) { | |
c2066e26 | 767 | newdup = (xfs_dir2_data_unused_t *)((char *)hdr + offset + len); |
ad354eb3 NS |
768 | newdup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG); |
769 | newdup->length = cpu_to_be16(oldlen - len); | |
bbaaf538 | 770 | *xfs_dir2_data_unused_tag_p(newdup) = |
c2066e26 | 771 | cpu_to_be16((char *)newdup - (char *)hdr); |
1da177e4 LT |
772 | xfs_dir2_data_log_unused(tp, bp, newdup); |
773 | /* | |
774 | * If it was in the table, remove it and add the new one. | |
775 | */ | |
776 | if (dfp) { | |
c2066e26 CH |
777 | xfs_dir2_data_freeremove(hdr, dfp, needlogp); |
778 | dfp = xfs_dir2_data_freeinsert(hdr, newdup, needlogp); | |
1da177e4 | 779 | ASSERT(dfp != NULL); |
ad354eb3 | 780 | ASSERT(dfp->length == newdup->length); |
c2066e26 | 781 | ASSERT(be16_to_cpu(dfp->offset) == (char *)newdup - (char *)hdr); |
1da177e4 LT |
782 | /* |
783 | * If we got inserted at the last slot, | |
784 | * that means we don't know if there was a better | |
785 | * choice for the last slot, or not. Rescan. | |
786 | */ | |
c2066e26 | 787 | needscan = dfp == &hdr->bestfree[2]; |
1da177e4 LT |
788 | } |
789 | } | |
790 | /* | |
791 | * We match the last part of the entry. | |
792 | * Trim the allocated space off the tail of the entry. | |
793 | */ | |
794 | else if (matchback) { | |
795 | newdup = dup; | |
c2066e26 | 796 | newdup->length = cpu_to_be16(((char *)hdr + offset) - (char *)newdup); |
bbaaf538 | 797 | *xfs_dir2_data_unused_tag_p(newdup) = |
c2066e26 | 798 | cpu_to_be16((char *)newdup - (char *)hdr); |
1da177e4 LT |
799 | xfs_dir2_data_log_unused(tp, bp, newdup); |
800 | /* | |
801 | * If it was in the table, remove it and add the new one. | |
802 | */ | |
803 | if (dfp) { | |
c2066e26 CH |
804 | xfs_dir2_data_freeremove(hdr, dfp, needlogp); |
805 | dfp = xfs_dir2_data_freeinsert(hdr, newdup, needlogp); | |
1da177e4 | 806 | ASSERT(dfp != NULL); |
ad354eb3 | 807 | ASSERT(dfp->length == newdup->length); |
c2066e26 | 808 | ASSERT(be16_to_cpu(dfp->offset) == (char *)newdup - (char *)hdr); |
1da177e4 LT |
809 | /* |
810 | * If we got inserted at the last slot, | |
811 | * that means we don't know if there was a better | |
812 | * choice for the last slot, or not. Rescan. | |
813 | */ | |
c2066e26 | 814 | needscan = dfp == &hdr->bestfree[2]; |
1da177e4 LT |
815 | } |
816 | } | |
817 | /* | |
818 | * Poking out the middle of an entry. | |
819 | * Make two new entries. | |
820 | */ | |
821 | else { | |
822 | newdup = dup; | |
c2066e26 | 823 | newdup->length = cpu_to_be16(((char *)hdr + offset) - (char *)newdup); |
bbaaf538 | 824 | *xfs_dir2_data_unused_tag_p(newdup) = |
c2066e26 | 825 | cpu_to_be16((char *)newdup - (char *)hdr); |
1da177e4 | 826 | xfs_dir2_data_log_unused(tp, bp, newdup); |
c2066e26 | 827 | newdup2 = (xfs_dir2_data_unused_t *)((char *)hdr + offset + len); |
ad354eb3 NS |
828 | newdup2->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG); |
829 | newdup2->length = cpu_to_be16(oldlen - len - be16_to_cpu(newdup->length)); | |
bbaaf538 | 830 | *xfs_dir2_data_unused_tag_p(newdup2) = |
c2066e26 | 831 | cpu_to_be16((char *)newdup2 - (char *)hdr); |
1da177e4 LT |
832 | xfs_dir2_data_log_unused(tp, bp, newdup2); |
833 | /* | |
834 | * If the old entry was in the table, we need to scan | |
835 | * if the 3rd entry was valid, since these entries | |
836 | * are smaller than the old one. | |
837 | * If we don't need to scan that means there were 1 or 2 | |
838 | * entries in the table, and removing the old and adding | |
839 | * the 2 new will work. | |
840 | */ | |
841 | if (dfp) { | |
c2066e26 | 842 | needscan = (hdr->bestfree[2].length != 0); |
1da177e4 | 843 | if (!needscan) { |
c2066e26 CH |
844 | xfs_dir2_data_freeremove(hdr, dfp, needlogp); |
845 | xfs_dir2_data_freeinsert(hdr, newdup, needlogp); | |
846 | xfs_dir2_data_freeinsert(hdr, newdup2, | |
847 | needlogp); | |
1da177e4 LT |
848 | } |
849 | } | |
850 | } | |
851 | *needscanp = needscan; | |
852 | } |