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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it would be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
11 | * | |
12 | * Further, this software is distributed without any warranty that it is | |
13 | * free of the rightful claim of any third person regarding infringement | |
14 | * or the like. Any license provided herein, whether implied or | |
15 | * otherwise, applies only to this software file. Patent licenses, if | |
16 | * any, provided herein do not apply to combinations of this program with | |
17 | * other software, or any other product whatsoever. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write the Free Software Foundation, Inc., 59 | |
21 | * Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
22 | * | |
23 | * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, | |
24 | * Mountain View, CA 94043, or: | |
25 | * | |
26 | * http://www.sgi.com | |
27 | * | |
28 | * For further information regarding this notice, see: | |
29 | * | |
30 | * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ | |
31 | */ | |
32 | ||
33 | /* | |
34 | * xfs_dir2_sf.c | |
35 | * Shortform directory implementation for v2 directories. | |
36 | */ | |
37 | ||
38 | #include "xfs.h" | |
39 | ||
40 | #include "xfs_macros.h" | |
41 | #include "xfs_types.h" | |
42 | #include "xfs_inum.h" | |
43 | #include "xfs_log.h" | |
44 | #include "xfs_trans.h" | |
45 | #include "xfs_sb.h" | |
46 | #include "xfs_dir.h" | |
47 | #include "xfs_dir2.h" | |
48 | #include "xfs_dmapi.h" | |
49 | #include "xfs_mount.h" | |
50 | #include "xfs_bmap_btree.h" | |
51 | #include "xfs_attr_sf.h" | |
52 | #include "xfs_dir_sf.h" | |
53 | #include "xfs_dir2_sf.h" | |
54 | #include "xfs_dinode.h" | |
55 | #include "xfs_inode_item.h" | |
56 | #include "xfs_inode.h" | |
57 | #include "xfs_da_btree.h" | |
58 | #include "xfs_dir_leaf.h" | |
59 | #include "xfs_error.h" | |
60 | #include "xfs_dir2_data.h" | |
61 | #include "xfs_dir2_leaf.h" | |
62 | #include "xfs_dir2_block.h" | |
63 | #include "xfs_dir2_trace.h" | |
64 | ||
65 | /* | |
66 | * Prototypes for internal functions. | |
67 | */ | |
68 | static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args, | |
69 | xfs_dir2_sf_entry_t *sfep, | |
70 | xfs_dir2_data_aoff_t offset, | |
71 | int new_isize); | |
72 | static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange, | |
73 | int new_isize); | |
74 | static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange, | |
75 | xfs_dir2_sf_entry_t **sfepp, | |
76 | xfs_dir2_data_aoff_t *offsetp); | |
77 | #ifdef DEBUG | |
78 | static void xfs_dir2_sf_check(xfs_da_args_t *args); | |
79 | #else | |
80 | #define xfs_dir2_sf_check(args) | |
81 | #endif /* DEBUG */ | |
82 | #if XFS_BIG_INUMS | |
83 | static void xfs_dir2_sf_toino4(xfs_da_args_t *args); | |
84 | static void xfs_dir2_sf_toino8(xfs_da_args_t *args); | |
85 | #endif /* XFS_BIG_INUMS */ | |
86 | ||
87 | /* | |
88 | * Given a block directory (dp/block), calculate its size as a shortform (sf) | |
89 | * directory and a header for the sf directory, if it will fit it the | |
90 | * space currently present in the inode. If it won't fit, the output | |
91 | * size is too big (but not accurate). | |
92 | */ | |
93 | int /* size for sf form */ | |
94 | xfs_dir2_block_sfsize( | |
95 | xfs_inode_t *dp, /* incore inode pointer */ | |
96 | xfs_dir2_block_t *block, /* block directory data */ | |
97 | xfs_dir2_sf_hdr_t *sfhp) /* output: header for sf form */ | |
98 | { | |
99 | xfs_dir2_dataptr_t addr; /* data entry address */ | |
100 | xfs_dir2_leaf_entry_t *blp; /* leaf area of the block */ | |
101 | xfs_dir2_block_tail_t *btp; /* tail area of the block */ | |
102 | int count; /* shortform entry count */ | |
103 | xfs_dir2_data_entry_t *dep; /* data entry in the block */ | |
104 | int i; /* block entry index */ | |
105 | int i8count; /* count of big-inode entries */ | |
106 | int isdot; /* entry is "." */ | |
107 | int isdotdot; /* entry is ".." */ | |
108 | xfs_mount_t *mp; /* mount structure pointer */ | |
109 | int namelen; /* total name bytes */ | |
110 | xfs_ino_t parent; /* parent inode number */ | |
111 | int size=0; /* total computed size */ | |
112 | ||
113 | mp = dp->i_mount; | |
114 | ||
115 | count = i8count = namelen = 0; | |
116 | btp = XFS_DIR2_BLOCK_TAIL_P(mp, block); | |
117 | blp = XFS_DIR2_BLOCK_LEAF_P(btp); | |
118 | ||
119 | /* | |
120 | * Iterate over the block's data entries by using the leaf pointers. | |
121 | */ | |
122 | for (i = 0; i < INT_GET(btp->count, ARCH_CONVERT); i++) { | |
123 | if ((addr = INT_GET(blp[i].address, ARCH_CONVERT)) == XFS_DIR2_NULL_DATAPTR) | |
124 | continue; | |
125 | /* | |
126 | * Calculate the pointer to the entry at hand. | |
127 | */ | |
128 | dep = (xfs_dir2_data_entry_t *) | |
129 | ((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, addr)); | |
130 | /* | |
131 | * Detect . and .., so we can special-case them. | |
132 | * . is not included in sf directories. | |
133 | * .. is included by just the parent inode number. | |
134 | */ | |
135 | isdot = dep->namelen == 1 && dep->name[0] == '.'; | |
136 | isdotdot = | |
137 | dep->namelen == 2 && | |
138 | dep->name[0] == '.' && dep->name[1] == '.'; | |
139 | #if XFS_BIG_INUMS | |
140 | if (!isdot) | |
141 | i8count += INT_GET(dep->inumber, ARCH_CONVERT) > XFS_DIR2_MAX_SHORT_INUM; | |
142 | #endif | |
143 | if (!isdot && !isdotdot) { | |
144 | count++; | |
145 | namelen += dep->namelen; | |
146 | } else if (isdotdot) | |
147 | parent = INT_GET(dep->inumber, ARCH_CONVERT); | |
148 | /* | |
149 | * Calculate the new size, see if we should give up yet. | |
150 | */ | |
151 | size = XFS_DIR2_SF_HDR_SIZE(i8count) + /* header */ | |
152 | count + /* namelen */ | |
153 | count * (uint)sizeof(xfs_dir2_sf_off_t) + /* offset */ | |
154 | namelen + /* name */ | |
155 | (i8count ? /* inumber */ | |
156 | (uint)sizeof(xfs_dir2_ino8_t) * count : | |
157 | (uint)sizeof(xfs_dir2_ino4_t) * count); | |
158 | if (size > XFS_IFORK_DSIZE(dp)) | |
159 | return size; /* size value is a failure */ | |
160 | } | |
161 | /* | |
162 | * Create the output header, if it worked. | |
163 | */ | |
164 | sfhp->count = count; | |
165 | sfhp->i8count = i8count; | |
166 | XFS_DIR2_SF_PUT_INUMBER((xfs_dir2_sf_t *)sfhp, &parent, &sfhp->parent); | |
167 | return size; | |
168 | } | |
169 | ||
170 | /* | |
171 | * Convert a block format directory to shortform. | |
172 | * Caller has already checked that it will fit, and built us a header. | |
173 | */ | |
174 | int /* error */ | |
175 | xfs_dir2_block_to_sf( | |
176 | xfs_da_args_t *args, /* operation arguments */ | |
177 | xfs_dabuf_t *bp, /* block buffer */ | |
178 | int size, /* shortform directory size */ | |
179 | xfs_dir2_sf_hdr_t *sfhp) /* shortform directory hdr */ | |
180 | { | |
181 | xfs_dir2_block_t *block; /* block structure */ | |
182 | xfs_dir2_block_tail_t *btp; /* block tail pointer */ | |
183 | xfs_dir2_data_entry_t *dep; /* data entry pointer */ | |
184 | xfs_inode_t *dp; /* incore directory inode */ | |
185 | xfs_dir2_data_unused_t *dup; /* unused data pointer */ | |
186 | char *endptr; /* end of data entries */ | |
187 | int error; /* error return value */ | |
188 | int logflags; /* inode logging flags */ | |
189 | xfs_mount_t *mp; /* filesystem mount point */ | |
190 | char *ptr; /* current data pointer */ | |
191 | xfs_dir2_sf_entry_t *sfep; /* shortform entry */ | |
192 | xfs_dir2_sf_t *sfp; /* shortform structure */ | |
193 | xfs_ino_t temp; | |
194 | ||
195 | xfs_dir2_trace_args_sb("block_to_sf", args, size, bp); | |
196 | dp = args->dp; | |
197 | mp = dp->i_mount; | |
198 | ||
199 | /* | |
200 | * Make a copy of the block data, so we can shrink the inode | |
201 | * and add local data. | |
202 | */ | |
203 | block = kmem_alloc(mp->m_dirblksize, KM_SLEEP); | |
204 | memcpy(block, bp->data, mp->m_dirblksize); | |
205 | logflags = XFS_ILOG_CORE; | |
206 | if ((error = xfs_dir2_shrink_inode(args, mp->m_dirdatablk, bp))) { | |
207 | ASSERT(error != ENOSPC); | |
208 | goto out; | |
209 | } | |
210 | /* | |
211 | * The buffer is now unconditionally gone, whether | |
212 | * xfs_dir2_shrink_inode worked or not. | |
213 | * | |
214 | * Convert the inode to local format. | |
215 | */ | |
216 | dp->i_df.if_flags &= ~XFS_IFEXTENTS; | |
217 | dp->i_df.if_flags |= XFS_IFINLINE; | |
218 | dp->i_d.di_format = XFS_DINODE_FMT_LOCAL; | |
219 | ASSERT(dp->i_df.if_bytes == 0); | |
220 | xfs_idata_realloc(dp, size, XFS_DATA_FORK); | |
221 | logflags |= XFS_ILOG_DDATA; | |
222 | /* | |
223 | * Copy the header into the newly allocate local space. | |
224 | */ | |
225 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; | |
226 | memcpy(sfp, sfhp, XFS_DIR2_SF_HDR_SIZE(sfhp->i8count)); | |
227 | dp->i_d.di_size = size; | |
228 | /* | |
229 | * Set up to loop over the block's entries. | |
230 | */ | |
231 | btp = XFS_DIR2_BLOCK_TAIL_P(mp, block); | |
232 | ptr = (char *)block->u; | |
233 | endptr = (char *)XFS_DIR2_BLOCK_LEAF_P(btp); | |
234 | sfep = XFS_DIR2_SF_FIRSTENTRY(sfp); | |
235 | /* | |
236 | * Loop over the active and unused entries. | |
237 | * Stop when we reach the leaf/tail portion of the block. | |
238 | */ | |
239 | while (ptr < endptr) { | |
240 | /* | |
241 | * If it's unused, just skip over it. | |
242 | */ | |
243 | dup = (xfs_dir2_data_unused_t *)ptr; | |
244 | if (INT_GET(dup->freetag, ARCH_CONVERT) == XFS_DIR2_DATA_FREE_TAG) { | |
245 | ptr += INT_GET(dup->length, ARCH_CONVERT); | |
246 | continue; | |
247 | } | |
248 | dep = (xfs_dir2_data_entry_t *)ptr; | |
249 | /* | |
250 | * Skip . | |
251 | */ | |
252 | if (dep->namelen == 1 && dep->name[0] == '.') | |
253 | ASSERT(INT_GET(dep->inumber, ARCH_CONVERT) == dp->i_ino); | |
254 | /* | |
255 | * Skip .., but make sure the inode number is right. | |
256 | */ | |
257 | else if (dep->namelen == 2 && | |
258 | dep->name[0] == '.' && dep->name[1] == '.') | |
259 | ASSERT(INT_GET(dep->inumber, ARCH_CONVERT) == | |
260 | XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent)); | |
261 | /* | |
262 | * Normal entry, copy it into shortform. | |
263 | */ | |
264 | else { | |
265 | sfep->namelen = dep->namelen; | |
266 | XFS_DIR2_SF_PUT_OFFSET(sfep, | |
267 | (xfs_dir2_data_aoff_t) | |
268 | ((char *)dep - (char *)block)); | |
269 | memcpy(sfep->name, dep->name, dep->namelen); | |
270 | temp=INT_GET(dep->inumber, ARCH_CONVERT); | |
271 | XFS_DIR2_SF_PUT_INUMBER(sfp, &temp, | |
272 | XFS_DIR2_SF_INUMBERP(sfep)); | |
273 | sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep); | |
274 | } | |
275 | ptr += XFS_DIR2_DATA_ENTSIZE(dep->namelen); | |
276 | } | |
277 | ASSERT((char *)sfep - (char *)sfp == size); | |
278 | xfs_dir2_sf_check(args); | |
279 | out: | |
280 | xfs_trans_log_inode(args->trans, dp, logflags); | |
281 | kmem_free(block, mp->m_dirblksize); | |
282 | return error; | |
283 | } | |
284 | ||
285 | /* | |
286 | * Add a name to a shortform directory. | |
287 | * There are two algorithms, "easy" and "hard" which we decide on | |
288 | * before changing anything. | |
289 | * Convert to block form if necessary, if the new entry won't fit. | |
290 | */ | |
291 | int /* error */ | |
292 | xfs_dir2_sf_addname( | |
293 | xfs_da_args_t *args) /* operation arguments */ | |
294 | { | |
295 | int add_entsize; /* size of the new entry */ | |
296 | xfs_inode_t *dp; /* incore directory inode */ | |
297 | int error; /* error return value */ | |
298 | int incr_isize; /* total change in size */ | |
299 | int new_isize; /* di_size after adding name */ | |
300 | int objchange; /* changing to 8-byte inodes */ | |
301 | xfs_dir2_data_aoff_t offset; /* offset for new entry */ | |
302 | int old_isize; /* di_size before adding name */ | |
303 | int pick; /* which algorithm to use */ | |
304 | xfs_dir2_sf_t *sfp; /* shortform structure */ | |
305 | xfs_dir2_sf_entry_t *sfep; /* shortform entry */ | |
306 | ||
307 | xfs_dir2_trace_args("sf_addname", args); | |
308 | ASSERT(xfs_dir2_sf_lookup(args) == ENOENT); | |
309 | dp = args->dp; | |
310 | ASSERT(dp->i_df.if_flags & XFS_IFINLINE); | |
311 | /* | |
312 | * Make sure the shortform value has some of its header. | |
313 | */ | |
314 | if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) { | |
315 | ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount)); | |
316 | return XFS_ERROR(EIO); | |
317 | } | |
318 | ASSERT(dp->i_df.if_bytes == dp->i_d.di_size); | |
319 | ASSERT(dp->i_df.if_u1.if_data != NULL); | |
320 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; | |
321 | ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count)); | |
322 | /* | |
323 | * Compute entry (and change in) size. | |
324 | */ | |
325 | add_entsize = XFS_DIR2_SF_ENTSIZE_BYNAME(sfp, args->namelen); | |
326 | incr_isize = add_entsize; | |
327 | objchange = 0; | |
328 | #if XFS_BIG_INUMS | |
329 | /* | |
330 | * Do we have to change to 8 byte inodes? | |
331 | */ | |
332 | if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->hdr.i8count == 0) { | |
333 | /* | |
334 | * Yes, adjust the entry size and the total size. | |
335 | */ | |
336 | add_entsize += | |
337 | (uint)sizeof(xfs_dir2_ino8_t) - | |
338 | (uint)sizeof(xfs_dir2_ino4_t); | |
339 | incr_isize += | |
340 | (sfp->hdr.count + 2) * | |
341 | ((uint)sizeof(xfs_dir2_ino8_t) - | |
342 | (uint)sizeof(xfs_dir2_ino4_t)); | |
343 | objchange = 1; | |
344 | } | |
345 | #endif | |
346 | old_isize = (int)dp->i_d.di_size; | |
347 | new_isize = old_isize + incr_isize; | |
348 | /* | |
349 | * Won't fit as shortform any more (due to size), | |
350 | * or the pick routine says it won't (due to offset values). | |
351 | */ | |
352 | if (new_isize > XFS_IFORK_DSIZE(dp) || | |
353 | (pick = | |
354 | xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) { | |
355 | /* | |
356 | * Just checking or no space reservation, it doesn't fit. | |
357 | */ | |
358 | if (args->justcheck || args->total == 0) | |
359 | return XFS_ERROR(ENOSPC); | |
360 | /* | |
361 | * Convert to block form then add the name. | |
362 | */ | |
363 | error = xfs_dir2_sf_to_block(args); | |
364 | if (error) | |
365 | return error; | |
366 | return xfs_dir2_block_addname(args); | |
367 | } | |
368 | /* | |
369 | * Just checking, it fits. | |
370 | */ | |
371 | if (args->justcheck) | |
372 | return 0; | |
373 | /* | |
374 | * Do it the easy way - just add it at the end. | |
375 | */ | |
376 | if (pick == 1) | |
377 | xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize); | |
378 | /* | |
379 | * Do it the hard way - look for a place to insert the new entry. | |
380 | * Convert to 8 byte inode numbers first if necessary. | |
381 | */ | |
382 | else { | |
383 | ASSERT(pick == 2); | |
384 | #if XFS_BIG_INUMS | |
385 | if (objchange) | |
386 | xfs_dir2_sf_toino8(args); | |
387 | #endif | |
388 | xfs_dir2_sf_addname_hard(args, objchange, new_isize); | |
389 | } | |
390 | xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA); | |
391 | return 0; | |
392 | } | |
393 | ||
394 | /* | |
395 | * Add the new entry the "easy" way. | |
396 | * This is copying the old directory and adding the new entry at the end. | |
397 | * Since it's sorted by "offset" we need room after the last offset | |
398 | * that's already there, and then room to convert to a block directory. | |
399 | * This is already checked by the pick routine. | |
400 | */ | |
401 | static void | |
402 | xfs_dir2_sf_addname_easy( | |
403 | xfs_da_args_t *args, /* operation arguments */ | |
404 | xfs_dir2_sf_entry_t *sfep, /* pointer to new entry */ | |
405 | xfs_dir2_data_aoff_t offset, /* offset to use for new ent */ | |
406 | int new_isize) /* new directory size */ | |
407 | { | |
408 | int byteoff; /* byte offset in sf dir */ | |
409 | xfs_inode_t *dp; /* incore directory inode */ | |
410 | xfs_dir2_sf_t *sfp; /* shortform structure */ | |
411 | ||
412 | dp = args->dp; | |
413 | ||
414 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; | |
415 | byteoff = (int)((char *)sfep - (char *)sfp); | |
416 | /* | |
417 | * Grow the in-inode space. | |
418 | */ | |
419 | xfs_idata_realloc(dp, XFS_DIR2_SF_ENTSIZE_BYNAME(sfp, args->namelen), | |
420 | XFS_DATA_FORK); | |
421 | /* | |
422 | * Need to set up again due to realloc of the inode data. | |
423 | */ | |
424 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; | |
425 | sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + byteoff); | |
426 | /* | |
427 | * Fill in the new entry. | |
428 | */ | |
429 | sfep->namelen = args->namelen; | |
430 | XFS_DIR2_SF_PUT_OFFSET(sfep, offset); | |
431 | memcpy(sfep->name, args->name, sfep->namelen); | |
432 | XFS_DIR2_SF_PUT_INUMBER(sfp, &args->inumber, | |
433 | XFS_DIR2_SF_INUMBERP(sfep)); | |
434 | /* | |
435 | * Update the header and inode. | |
436 | */ | |
437 | sfp->hdr.count++; | |
438 | #if XFS_BIG_INUMS | |
439 | if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) | |
440 | sfp->hdr.i8count++; | |
441 | #endif | |
442 | dp->i_d.di_size = new_isize; | |
443 | xfs_dir2_sf_check(args); | |
444 | } | |
445 | ||
446 | /* | |
447 | * Add the new entry the "hard" way. | |
448 | * The caller has already converted to 8 byte inode numbers if necessary, | |
449 | * in which case we need to leave the i8count at 1. | |
450 | * Find a hole that the new entry will fit into, and copy | |
451 | * the first part of the entries, the new entry, and the last part of | |
452 | * the entries. | |
453 | */ | |
454 | /* ARGSUSED */ | |
455 | static void | |
456 | xfs_dir2_sf_addname_hard( | |
457 | xfs_da_args_t *args, /* operation arguments */ | |
458 | int objchange, /* changing inode number size */ | |
459 | int new_isize) /* new directory size */ | |
460 | { | |
461 | int add_datasize; /* data size need for new ent */ | |
462 | char *buf; /* buffer for old */ | |
463 | xfs_inode_t *dp; /* incore directory inode */ | |
464 | int eof; /* reached end of old dir */ | |
465 | int nbytes; /* temp for byte copies */ | |
466 | xfs_dir2_data_aoff_t new_offset; /* next offset value */ | |
467 | xfs_dir2_data_aoff_t offset; /* current offset value */ | |
468 | int old_isize; /* previous di_size */ | |
469 | xfs_dir2_sf_entry_t *oldsfep; /* entry in original dir */ | |
470 | xfs_dir2_sf_t *oldsfp; /* original shortform dir */ | |
471 | xfs_dir2_sf_entry_t *sfep; /* entry in new dir */ | |
472 | xfs_dir2_sf_t *sfp; /* new shortform dir */ | |
473 | ||
474 | /* | |
475 | * Copy the old directory to the stack buffer. | |
476 | */ | |
477 | dp = args->dp; | |
478 | ||
479 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; | |
480 | old_isize = (int)dp->i_d.di_size; | |
481 | buf = kmem_alloc(old_isize, KM_SLEEP); | |
482 | oldsfp = (xfs_dir2_sf_t *)buf; | |
483 | memcpy(oldsfp, sfp, old_isize); | |
484 | /* | |
485 | * Loop over the old directory finding the place we're going | |
486 | * to insert the new entry. | |
487 | * If it's going to end up at the end then oldsfep will point there. | |
488 | */ | |
489 | for (offset = XFS_DIR2_DATA_FIRST_OFFSET, | |
490 | oldsfep = XFS_DIR2_SF_FIRSTENTRY(oldsfp), | |
491 | add_datasize = XFS_DIR2_DATA_ENTSIZE(args->namelen), | |
492 | eof = (char *)oldsfep == &buf[old_isize]; | |
493 | !eof; | |
494 | offset = new_offset + XFS_DIR2_DATA_ENTSIZE(oldsfep->namelen), | |
495 | oldsfep = XFS_DIR2_SF_NEXTENTRY(oldsfp, oldsfep), | |
496 | eof = (char *)oldsfep == &buf[old_isize]) { | |
497 | new_offset = XFS_DIR2_SF_GET_OFFSET(oldsfep); | |
498 | if (offset + add_datasize <= new_offset) | |
499 | break; | |
500 | } | |
501 | /* | |
502 | * Get rid of the old directory, then allocate space for | |
503 | * the new one. We do this so xfs_idata_realloc won't copy | |
504 | * the data. | |
505 | */ | |
506 | xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK); | |
507 | xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK); | |
508 | /* | |
509 | * Reset the pointer since the buffer was reallocated. | |
510 | */ | |
511 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; | |
512 | /* | |
513 | * Copy the first part of the directory, including the header. | |
514 | */ | |
515 | nbytes = (int)((char *)oldsfep - (char *)oldsfp); | |
516 | memcpy(sfp, oldsfp, nbytes); | |
517 | sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes); | |
518 | /* | |
519 | * Fill in the new entry, and update the header counts. | |
520 | */ | |
521 | sfep->namelen = args->namelen; | |
522 | XFS_DIR2_SF_PUT_OFFSET(sfep, offset); | |
523 | memcpy(sfep->name, args->name, sfep->namelen); | |
524 | XFS_DIR2_SF_PUT_INUMBER(sfp, &args->inumber, | |
525 | XFS_DIR2_SF_INUMBERP(sfep)); | |
526 | sfp->hdr.count++; | |
527 | #if XFS_BIG_INUMS | |
528 | if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange) | |
529 | sfp->hdr.i8count++; | |
530 | #endif | |
531 | /* | |
532 | * If there's more left to copy, do that. | |
533 | */ | |
534 | if (!eof) { | |
535 | sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep); | |
536 | memcpy(sfep, oldsfep, old_isize - nbytes); | |
537 | } | |
538 | kmem_free(buf, old_isize); | |
539 | dp->i_d.di_size = new_isize; | |
540 | xfs_dir2_sf_check(args); | |
541 | } | |
542 | ||
543 | /* | |
544 | * Decide if the new entry will fit at all. | |
545 | * If it will fit, pick between adding the new entry to the end (easy) | |
546 | * or somewhere else (hard). | |
547 | * Return 0 (won't fit), 1 (easy), 2 (hard). | |
548 | */ | |
549 | /*ARGSUSED*/ | |
550 | static int /* pick result */ | |
551 | xfs_dir2_sf_addname_pick( | |
552 | xfs_da_args_t *args, /* operation arguments */ | |
553 | int objchange, /* inode # size changes */ | |
554 | xfs_dir2_sf_entry_t **sfepp, /* out(1): new entry ptr */ | |
555 | xfs_dir2_data_aoff_t *offsetp) /* out(1): new offset */ | |
556 | { | |
557 | xfs_inode_t *dp; /* incore directory inode */ | |
558 | int holefit; /* found hole it will fit in */ | |
559 | int i; /* entry number */ | |
560 | xfs_mount_t *mp; /* filesystem mount point */ | |
561 | xfs_dir2_data_aoff_t offset; /* data block offset */ | |
562 | xfs_dir2_sf_entry_t *sfep; /* shortform entry */ | |
563 | xfs_dir2_sf_t *sfp; /* shortform structure */ | |
564 | int size; /* entry's data size */ | |
565 | int used; /* data bytes used */ | |
566 | ||
567 | dp = args->dp; | |
568 | mp = dp->i_mount; | |
569 | ||
570 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; | |
571 | size = XFS_DIR2_DATA_ENTSIZE(args->namelen); | |
572 | offset = XFS_DIR2_DATA_FIRST_OFFSET; | |
573 | sfep = XFS_DIR2_SF_FIRSTENTRY(sfp); | |
574 | holefit = 0; | |
575 | /* | |
576 | * Loop over sf entries. | |
577 | * Keep track of data offset and whether we've seen a place | |
578 | * to insert the new entry. | |
579 | */ | |
580 | for (i = 0; i < sfp->hdr.count; i++) { | |
581 | if (!holefit) | |
582 | holefit = offset + size <= XFS_DIR2_SF_GET_OFFSET(sfep); | |
583 | offset = XFS_DIR2_SF_GET_OFFSET(sfep) + | |
584 | XFS_DIR2_DATA_ENTSIZE(sfep->namelen); | |
585 | sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep); | |
586 | } | |
587 | /* | |
588 | * Calculate data bytes used excluding the new entry, if this | |
589 | * was a data block (block form directory). | |
590 | */ | |
591 | used = offset + | |
592 | (sfp->hdr.count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) + | |
593 | (uint)sizeof(xfs_dir2_block_tail_t); | |
594 | /* | |
595 | * If it won't fit in a block form then we can't insert it, | |
596 | * we'll go back, convert to block, then try the insert and convert | |
597 | * to leaf. | |
598 | */ | |
599 | if (used + (holefit ? 0 : size) > mp->m_dirblksize) | |
600 | return 0; | |
601 | /* | |
602 | * If changing the inode number size, do it the hard way. | |
603 | */ | |
604 | #if XFS_BIG_INUMS | |
605 | if (objchange) { | |
606 | return 2; | |
607 | } | |
608 | #else | |
609 | ASSERT(objchange == 0); | |
610 | #endif | |
611 | /* | |
612 | * If it won't fit at the end then do it the hard way (use the hole). | |
613 | */ | |
614 | if (used + size > mp->m_dirblksize) | |
615 | return 2; | |
616 | /* | |
617 | * Do it the easy way. | |
618 | */ | |
619 | *sfepp = sfep; | |
620 | *offsetp = offset; | |
621 | return 1; | |
622 | } | |
623 | ||
624 | #ifdef DEBUG | |
625 | /* | |
626 | * Check consistency of shortform directory, assert if bad. | |
627 | */ | |
628 | static void | |
629 | xfs_dir2_sf_check( | |
630 | xfs_da_args_t *args) /* operation arguments */ | |
631 | { | |
632 | xfs_inode_t *dp; /* incore directory inode */ | |
633 | int i; /* entry number */ | |
634 | int i8count; /* number of big inode#s */ | |
635 | xfs_ino_t ino; /* entry inode number */ | |
636 | int offset; /* data offset */ | |
637 | xfs_dir2_sf_entry_t *sfep; /* shortform dir entry */ | |
638 | xfs_dir2_sf_t *sfp; /* shortform structure */ | |
639 | ||
640 | dp = args->dp; | |
641 | ||
642 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; | |
643 | offset = XFS_DIR2_DATA_FIRST_OFFSET; | |
644 | ino = XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent); | |
645 | i8count = ino > XFS_DIR2_MAX_SHORT_INUM; | |
646 | ||
647 | for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp); | |
648 | i < sfp->hdr.count; | |
649 | i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) { | |
650 | ASSERT(XFS_DIR2_SF_GET_OFFSET(sfep) >= offset); | |
651 | ino = XFS_DIR2_SF_GET_INUMBER(sfp, XFS_DIR2_SF_INUMBERP(sfep)); | |
652 | i8count += ino > XFS_DIR2_MAX_SHORT_INUM; | |
653 | offset = | |
654 | XFS_DIR2_SF_GET_OFFSET(sfep) + | |
655 | XFS_DIR2_DATA_ENTSIZE(sfep->namelen); | |
656 | } | |
657 | ASSERT(i8count == sfp->hdr.i8count); | |
658 | ASSERT(XFS_BIG_INUMS || i8count == 0); | |
659 | ASSERT((char *)sfep - (char *)sfp == dp->i_d.di_size); | |
660 | ASSERT(offset + | |
661 | (sfp->hdr.count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) + | |
662 | (uint)sizeof(xfs_dir2_block_tail_t) <= | |
663 | dp->i_mount->m_dirblksize); | |
664 | } | |
665 | #endif /* DEBUG */ | |
666 | ||
667 | /* | |
668 | * Create a new (shortform) directory. | |
669 | */ | |
670 | int /* error, always 0 */ | |
671 | xfs_dir2_sf_create( | |
672 | xfs_da_args_t *args, /* operation arguments */ | |
673 | xfs_ino_t pino) /* parent inode number */ | |
674 | { | |
675 | xfs_inode_t *dp; /* incore directory inode */ | |
676 | int i8count; /* parent inode is an 8-byte number */ | |
677 | xfs_dir2_sf_t *sfp; /* shortform structure */ | |
678 | int size; /* directory size */ | |
679 | ||
680 | xfs_dir2_trace_args_i("sf_create", args, pino); | |
681 | dp = args->dp; | |
682 | ||
683 | ASSERT(dp != NULL); | |
684 | ASSERT(dp->i_d.di_size == 0); | |
685 | /* | |
686 | * If it's currently a zero-length extent file, | |
687 | * convert it to local format. | |
688 | */ | |
689 | if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) { | |
690 | dp->i_df.if_flags &= ~XFS_IFEXTENTS; /* just in case */ | |
691 | dp->i_d.di_format = XFS_DINODE_FMT_LOCAL; | |
692 | xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE); | |
693 | dp->i_df.if_flags |= XFS_IFINLINE; | |
694 | } | |
695 | ASSERT(dp->i_df.if_flags & XFS_IFINLINE); | |
696 | ASSERT(dp->i_df.if_bytes == 0); | |
697 | i8count = pino > XFS_DIR2_MAX_SHORT_INUM; | |
698 | size = XFS_DIR2_SF_HDR_SIZE(i8count); | |
699 | /* | |
700 | * Make a buffer for the data. | |
701 | */ | |
702 | xfs_idata_realloc(dp, size, XFS_DATA_FORK); | |
703 | /* | |
704 | * Fill in the header, | |
705 | */ | |
706 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; | |
707 | sfp->hdr.i8count = i8count; | |
708 | /* | |
709 | * Now can put in the inode number, since i8count is set. | |
710 | */ | |
711 | XFS_DIR2_SF_PUT_INUMBER(sfp, &pino, &sfp->hdr.parent); | |
712 | sfp->hdr.count = 0; | |
713 | dp->i_d.di_size = size; | |
714 | xfs_dir2_sf_check(args); | |
715 | xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA); | |
716 | return 0; | |
717 | } | |
718 | ||
719 | int /* error */ | |
720 | xfs_dir2_sf_getdents( | |
721 | xfs_inode_t *dp, /* incore directory inode */ | |
722 | uio_t *uio, /* caller's buffer control */ | |
723 | int *eofp, /* eof reached? (out) */ | |
724 | xfs_dirent_t *dbp, /* caller's buffer */ | |
725 | xfs_dir2_put_t put) /* abi's formatting function */ | |
726 | { | |
727 | int error; /* error return value */ | |
728 | int i; /* shortform entry number */ | |
729 | xfs_mount_t *mp; /* filesystem mount point */ | |
730 | xfs_dir2_dataptr_t off; /* current entry's offset */ | |
731 | xfs_dir2_put_args_t p; /* arg package for put rtn */ | |
732 | xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */ | |
733 | xfs_dir2_sf_t *sfp; /* shortform structure */ | |
734 | xfs_off_t dir_offset; | |
735 | ||
736 | mp = dp->i_mount; | |
737 | ||
738 | ASSERT(dp->i_df.if_flags & XFS_IFINLINE); | |
739 | /* | |
740 | * Give up if the directory is way too short. | |
741 | */ | |
742 | if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) { | |
743 | ASSERT(XFS_FORCED_SHUTDOWN(mp)); | |
744 | return XFS_ERROR(EIO); | |
745 | } | |
746 | ||
747 | dir_offset = uio->uio_offset; | |
748 | ||
749 | ASSERT(dp->i_df.if_bytes == dp->i_d.di_size); | |
750 | ASSERT(dp->i_df.if_u1.if_data != NULL); | |
751 | ||
752 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; | |
753 | ||
754 | ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count)); | |
755 | ||
756 | /* | |
757 | * If the block number in the offset is out of range, we're done. | |
758 | */ | |
759 | if (XFS_DIR2_DATAPTR_TO_DB(mp, dir_offset) > mp->m_dirdatablk) { | |
760 | *eofp = 1; | |
761 | return 0; | |
762 | } | |
763 | ||
764 | /* | |
765 | * Set up putargs structure. | |
766 | */ | |
767 | p.dbp = dbp; | |
768 | p.put = put; | |
769 | p.uio = uio; | |
770 | /* | |
771 | * Put . entry unless we're starting past it. | |
772 | */ | |
773 | if (dir_offset <= | |
774 | XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk, | |
775 | XFS_DIR2_DATA_DOT_OFFSET)) { | |
776 | p.cook = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, 0, | |
777 | XFS_DIR2_DATA_DOTDOT_OFFSET); | |
778 | p.ino = dp->i_ino; | |
779 | #if XFS_BIG_INUMS | |
780 | p.ino += mp->m_inoadd; | |
781 | #endif | |
782 | p.name = "."; | |
783 | p.namelen = 1; | |
784 | ||
785 | error = p.put(&p); | |
786 | ||
787 | if (!p.done) { | |
788 | uio->uio_offset = | |
789 | XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk, | |
790 | XFS_DIR2_DATA_DOT_OFFSET); | |
791 | return error; | |
792 | } | |
793 | } | |
794 | ||
795 | /* | |
796 | * Put .. entry unless we're starting past it. | |
797 | */ | |
798 | if (dir_offset <= | |
799 | XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk, | |
800 | XFS_DIR2_DATA_DOTDOT_OFFSET)) { | |
801 | p.cook = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk, | |
802 | XFS_DIR2_DATA_FIRST_OFFSET); | |
803 | p.ino = XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent); | |
804 | #if XFS_BIG_INUMS | |
805 | p.ino += mp->m_inoadd; | |
806 | #endif | |
807 | p.name = ".."; | |
808 | p.namelen = 2; | |
809 | ||
810 | error = p.put(&p); | |
811 | ||
812 | if (!p.done) { | |
813 | uio->uio_offset = | |
814 | XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk, | |
815 | XFS_DIR2_DATA_DOTDOT_OFFSET); | |
816 | return error; | |
817 | } | |
818 | } | |
819 | ||
820 | /* | |
821 | * Loop while there are more entries and put'ing works. | |
822 | */ | |
823 | for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp); | |
824 | i < sfp->hdr.count; | |
825 | i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) { | |
826 | ||
827 | off = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk, | |
828 | XFS_DIR2_SF_GET_OFFSET(sfep)); | |
829 | ||
830 | if (dir_offset > off) | |
831 | continue; | |
832 | ||
833 | p.namelen = sfep->namelen; | |
834 | ||
835 | p.cook = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk, | |
836 | XFS_DIR2_SF_GET_OFFSET(sfep) + | |
837 | XFS_DIR2_DATA_ENTSIZE(p.namelen)); | |
838 | ||
839 | p.ino = XFS_DIR2_SF_GET_INUMBER(sfp, XFS_DIR2_SF_INUMBERP(sfep)); | |
840 | #if XFS_BIG_INUMS | |
841 | p.ino += mp->m_inoadd; | |
842 | #endif | |
843 | p.name = (char *)sfep->name; | |
844 | ||
845 | error = p.put(&p); | |
846 | ||
847 | if (!p.done) { | |
848 | uio->uio_offset = off; | |
849 | return error; | |
850 | } | |
851 | } | |
852 | ||
853 | /* | |
854 | * They all fit. | |
855 | */ | |
856 | *eofp = 1; | |
857 | ||
858 | uio->uio_offset = | |
859 | XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk + 1, 0); | |
860 | ||
861 | return 0; | |
862 | } | |
863 | ||
864 | /* | |
865 | * Lookup an entry in a shortform directory. | |
866 | * Returns EEXIST if found, ENOENT if not found. | |
867 | */ | |
868 | int /* error */ | |
869 | xfs_dir2_sf_lookup( | |
870 | xfs_da_args_t *args) /* operation arguments */ | |
871 | { | |
872 | xfs_inode_t *dp; /* incore directory inode */ | |
873 | int i; /* entry index */ | |
874 | xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */ | |
875 | xfs_dir2_sf_t *sfp; /* shortform structure */ | |
876 | ||
877 | xfs_dir2_trace_args("sf_lookup", args); | |
878 | xfs_dir2_sf_check(args); | |
879 | dp = args->dp; | |
880 | ||
881 | ASSERT(dp->i_df.if_flags & XFS_IFINLINE); | |
882 | /* | |
883 | * Bail out if the directory is way too short. | |
884 | */ | |
885 | if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) { | |
886 | ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount)); | |
887 | return XFS_ERROR(EIO); | |
888 | } | |
889 | ASSERT(dp->i_df.if_bytes == dp->i_d.di_size); | |
890 | ASSERT(dp->i_df.if_u1.if_data != NULL); | |
891 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; | |
892 | ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count)); | |
893 | /* | |
894 | * Special case for . | |
895 | */ | |
896 | if (args->namelen == 1 && args->name[0] == '.') { | |
897 | args->inumber = dp->i_ino; | |
898 | return XFS_ERROR(EEXIST); | |
899 | } | |
900 | /* | |
901 | * Special case for .. | |
902 | */ | |
903 | if (args->namelen == 2 && | |
904 | args->name[0] == '.' && args->name[1] == '.') { | |
905 | args->inumber = XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent); | |
906 | return XFS_ERROR(EEXIST); | |
907 | } | |
908 | /* | |
909 | * Loop over all the entries trying to match ours. | |
910 | */ | |
911 | for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp); | |
912 | i < sfp->hdr.count; | |
913 | i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) { | |
914 | if (sfep->namelen == args->namelen && | |
915 | sfep->name[0] == args->name[0] && | |
916 | memcmp(args->name, sfep->name, args->namelen) == 0) { | |
917 | args->inumber = | |
918 | XFS_DIR2_SF_GET_INUMBER(sfp, | |
919 | XFS_DIR2_SF_INUMBERP(sfep)); | |
920 | return XFS_ERROR(EEXIST); | |
921 | } | |
922 | } | |
923 | /* | |
924 | * Didn't find it. | |
925 | */ | |
926 | ASSERT(args->oknoent); | |
927 | return XFS_ERROR(ENOENT); | |
928 | } | |
929 | ||
930 | /* | |
931 | * Remove an entry from a shortform directory. | |
932 | */ | |
933 | int /* error */ | |
934 | xfs_dir2_sf_removename( | |
935 | xfs_da_args_t *args) | |
936 | { | |
937 | int byteoff; /* offset of removed entry */ | |
938 | xfs_inode_t *dp; /* incore directory inode */ | |
939 | int entsize; /* this entry's size */ | |
940 | int i; /* shortform entry index */ | |
941 | int newsize; /* new inode size */ | |
942 | int oldsize; /* old inode size */ | |
943 | xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */ | |
944 | xfs_dir2_sf_t *sfp; /* shortform structure */ | |
945 | ||
946 | xfs_dir2_trace_args("sf_removename", args); | |
947 | dp = args->dp; | |
948 | ||
949 | ASSERT(dp->i_df.if_flags & XFS_IFINLINE); | |
950 | oldsize = (int)dp->i_d.di_size; | |
951 | /* | |
952 | * Bail out if the directory is way too short. | |
953 | */ | |
954 | if (oldsize < offsetof(xfs_dir2_sf_hdr_t, parent)) { | |
955 | ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount)); | |
956 | return XFS_ERROR(EIO); | |
957 | } | |
958 | ASSERT(dp->i_df.if_bytes == oldsize); | |
959 | ASSERT(dp->i_df.if_u1.if_data != NULL); | |
960 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; | |
961 | ASSERT(oldsize >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count)); | |
962 | /* | |
963 | * Loop over the old directory entries. | |
964 | * Find the one we're deleting. | |
965 | */ | |
966 | for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp); | |
967 | i < sfp->hdr.count; | |
968 | i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) { | |
969 | if (sfep->namelen == args->namelen && | |
970 | sfep->name[0] == args->name[0] && | |
971 | memcmp(sfep->name, args->name, args->namelen) == 0) { | |
972 | ASSERT(XFS_DIR2_SF_GET_INUMBER(sfp, | |
973 | XFS_DIR2_SF_INUMBERP(sfep)) == | |
974 | args->inumber); | |
975 | break; | |
976 | } | |
977 | } | |
978 | /* | |
979 | * Didn't find it. | |
980 | */ | |
981 | if (i == sfp->hdr.count) { | |
982 | return XFS_ERROR(ENOENT); | |
983 | } | |
984 | /* | |
985 | * Calculate sizes. | |
986 | */ | |
987 | byteoff = (int)((char *)sfep - (char *)sfp); | |
988 | entsize = XFS_DIR2_SF_ENTSIZE_BYNAME(sfp, args->namelen); | |
989 | newsize = oldsize - entsize; | |
990 | /* | |
991 | * Copy the part if any after the removed entry, sliding it down. | |
992 | */ | |
993 | if (byteoff + entsize < oldsize) | |
994 | memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize, | |
995 | oldsize - (byteoff + entsize)); | |
996 | /* | |
997 | * Fix up the header and file size. | |
998 | */ | |
999 | sfp->hdr.count--; | |
1000 | dp->i_d.di_size = newsize; | |
1001 | /* | |
1002 | * Reallocate, making it smaller. | |
1003 | */ | |
1004 | xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK); | |
1005 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; | |
1006 | #if XFS_BIG_INUMS | |
1007 | /* | |
1008 | * Are we changing inode number size? | |
1009 | */ | |
1010 | if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) { | |
1011 | if (sfp->hdr.i8count == 1) | |
1012 | xfs_dir2_sf_toino4(args); | |
1013 | else | |
1014 | sfp->hdr.i8count--; | |
1015 | } | |
1016 | #endif | |
1017 | xfs_dir2_sf_check(args); | |
1018 | xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA); | |
1019 | return 0; | |
1020 | } | |
1021 | ||
1022 | /* | |
1023 | * Replace the inode number of an entry in a shortform directory. | |
1024 | */ | |
1025 | int /* error */ | |
1026 | xfs_dir2_sf_replace( | |
1027 | xfs_da_args_t *args) /* operation arguments */ | |
1028 | { | |
1029 | xfs_inode_t *dp; /* incore directory inode */ | |
1030 | int i; /* entry index */ | |
1031 | #if XFS_BIG_INUMS || defined(DEBUG) | |
1032 | xfs_ino_t ino=0; /* entry old inode number */ | |
1033 | #endif | |
1034 | #if XFS_BIG_INUMS | |
1035 | int i8elevated; /* sf_toino8 set i8count=1 */ | |
1036 | #endif | |
1037 | xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */ | |
1038 | xfs_dir2_sf_t *sfp; /* shortform structure */ | |
1039 | ||
1040 | xfs_dir2_trace_args("sf_replace", args); | |
1041 | dp = args->dp; | |
1042 | ||
1043 | ASSERT(dp->i_df.if_flags & XFS_IFINLINE); | |
1044 | /* | |
1045 | * Bail out if the shortform directory is way too small. | |
1046 | */ | |
1047 | if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) { | |
1048 | ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount)); | |
1049 | return XFS_ERROR(EIO); | |
1050 | } | |
1051 | ASSERT(dp->i_df.if_bytes == dp->i_d.di_size); | |
1052 | ASSERT(dp->i_df.if_u1.if_data != NULL); | |
1053 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; | |
1054 | ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count)); | |
1055 | #if XFS_BIG_INUMS | |
1056 | /* | |
1057 | * New inode number is large, and need to convert to 8-byte inodes. | |
1058 | */ | |
1059 | if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->hdr.i8count == 0) { | |
1060 | int error; /* error return value */ | |
1061 | int newsize; /* new inode size */ | |
1062 | ||
1063 | newsize = | |
1064 | dp->i_df.if_bytes + | |
1065 | (sfp->hdr.count + 1) * | |
1066 | ((uint)sizeof(xfs_dir2_ino8_t) - | |
1067 | (uint)sizeof(xfs_dir2_ino4_t)); | |
1068 | /* | |
1069 | * Won't fit as shortform, convert to block then do replace. | |
1070 | */ | |
1071 | if (newsize > XFS_IFORK_DSIZE(dp)) { | |
1072 | error = xfs_dir2_sf_to_block(args); | |
1073 | if (error) { | |
1074 | return error; | |
1075 | } | |
1076 | return xfs_dir2_block_replace(args); | |
1077 | } | |
1078 | /* | |
1079 | * Still fits, convert to 8-byte now. | |
1080 | */ | |
1081 | xfs_dir2_sf_toino8(args); | |
1082 | i8elevated = 1; | |
1083 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; | |
1084 | } else | |
1085 | i8elevated = 0; | |
1086 | #endif | |
1087 | ASSERT(args->namelen != 1 || args->name[0] != '.'); | |
1088 | /* | |
1089 | * Replace ..'s entry. | |
1090 | */ | |
1091 | if (args->namelen == 2 && | |
1092 | args->name[0] == '.' && args->name[1] == '.') { | |
1093 | #if XFS_BIG_INUMS || defined(DEBUG) | |
1094 | ino = XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent); | |
1095 | ASSERT(args->inumber != ino); | |
1096 | #endif | |
1097 | XFS_DIR2_SF_PUT_INUMBER(sfp, &args->inumber, &sfp->hdr.parent); | |
1098 | } | |
1099 | /* | |
1100 | * Normal entry, look for the name. | |
1101 | */ | |
1102 | else { | |
1103 | for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp); | |
1104 | i < sfp->hdr.count; | |
1105 | i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) { | |
1106 | if (sfep->namelen == args->namelen && | |
1107 | sfep->name[0] == args->name[0] && | |
1108 | memcmp(args->name, sfep->name, args->namelen) == 0) { | |
1109 | #if XFS_BIG_INUMS || defined(DEBUG) | |
1110 | ino = XFS_DIR2_SF_GET_INUMBER(sfp, | |
1111 | XFS_DIR2_SF_INUMBERP(sfep)); | |
1112 | ASSERT(args->inumber != ino); | |
1113 | #endif | |
1114 | XFS_DIR2_SF_PUT_INUMBER(sfp, &args->inumber, | |
1115 | XFS_DIR2_SF_INUMBERP(sfep)); | |
1116 | break; | |
1117 | } | |
1118 | } | |
1119 | /* | |
1120 | * Didn't find it. | |
1121 | */ | |
1122 | if (i == sfp->hdr.count) { | |
1123 | ASSERT(args->oknoent); | |
1124 | #if XFS_BIG_INUMS | |
1125 | if (i8elevated) | |
1126 | xfs_dir2_sf_toino4(args); | |
1127 | #endif | |
1128 | return XFS_ERROR(ENOENT); | |
1129 | } | |
1130 | } | |
1131 | #if XFS_BIG_INUMS | |
1132 | /* | |
1133 | * See if the old number was large, the new number is small. | |
1134 | */ | |
1135 | if (ino > XFS_DIR2_MAX_SHORT_INUM && | |
1136 | args->inumber <= XFS_DIR2_MAX_SHORT_INUM) { | |
1137 | /* | |
1138 | * And the old count was one, so need to convert to small. | |
1139 | */ | |
1140 | if (sfp->hdr.i8count == 1) | |
1141 | xfs_dir2_sf_toino4(args); | |
1142 | else | |
1143 | sfp->hdr.i8count--; | |
1144 | } | |
1145 | /* | |
1146 | * See if the old number was small, the new number is large. | |
1147 | */ | |
1148 | if (ino <= XFS_DIR2_MAX_SHORT_INUM && | |
1149 | args->inumber > XFS_DIR2_MAX_SHORT_INUM) { | |
1150 | /* | |
1151 | * add to the i8count unless we just converted to 8-byte | |
1152 | * inodes (which does an implied i8count = 1) | |
1153 | */ | |
1154 | ASSERT(sfp->hdr.i8count != 0); | |
1155 | if (!i8elevated) | |
1156 | sfp->hdr.i8count++; | |
1157 | } | |
1158 | #endif | |
1159 | xfs_dir2_sf_check(args); | |
1160 | xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA); | |
1161 | return 0; | |
1162 | } | |
1163 | ||
1164 | #if XFS_BIG_INUMS | |
1165 | /* | |
1166 | * Convert from 8-byte inode numbers to 4-byte inode numbers. | |
1167 | * The last 8-byte inode number is gone, but the count is still 1. | |
1168 | */ | |
1169 | static void | |
1170 | xfs_dir2_sf_toino4( | |
1171 | xfs_da_args_t *args) /* operation arguments */ | |
1172 | { | |
1173 | char *buf; /* old dir's buffer */ | |
1174 | xfs_inode_t *dp; /* incore directory inode */ | |
1175 | int i; /* entry index */ | |
1176 | xfs_ino_t ino; /* entry inode number */ | |
1177 | int newsize; /* new inode size */ | |
1178 | xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */ | |
1179 | xfs_dir2_sf_t *oldsfp; /* old sf directory */ | |
1180 | int oldsize; /* old inode size */ | |
1181 | xfs_dir2_sf_entry_t *sfep; /* new sf entry */ | |
1182 | xfs_dir2_sf_t *sfp; /* new sf directory */ | |
1183 | ||
1184 | xfs_dir2_trace_args("sf_toino4", args); | |
1185 | dp = args->dp; | |
1186 | ||
1187 | /* | |
1188 | * Copy the old directory to the buffer. | |
1189 | * Then nuke it from the inode, and add the new buffer to the inode. | |
1190 | * Don't want xfs_idata_realloc copying the data here. | |
1191 | */ | |
1192 | oldsize = dp->i_df.if_bytes; | |
1193 | buf = kmem_alloc(oldsize, KM_SLEEP); | |
1194 | oldsfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; | |
1195 | ASSERT(oldsfp->hdr.i8count == 1); | |
1196 | memcpy(buf, oldsfp, oldsize); | |
1197 | /* | |
1198 | * Compute the new inode size. | |
1199 | */ | |
1200 | newsize = | |
1201 | oldsize - | |
1202 | (oldsfp->hdr.count + 1) * | |
1203 | ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t)); | |
1204 | xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK); | |
1205 | xfs_idata_realloc(dp, newsize, XFS_DATA_FORK); | |
1206 | /* | |
1207 | * Reset our pointers, the data has moved. | |
1208 | */ | |
1209 | oldsfp = (xfs_dir2_sf_t *)buf; | |
1210 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; | |
1211 | /* | |
1212 | * Fill in the new header. | |
1213 | */ | |
1214 | sfp->hdr.count = oldsfp->hdr.count; | |
1215 | sfp->hdr.i8count = 0; | |
1216 | ino = XFS_DIR2_SF_GET_INUMBER(oldsfp, &oldsfp->hdr.parent); | |
1217 | XFS_DIR2_SF_PUT_INUMBER(sfp, &ino, &sfp->hdr.parent); | |
1218 | /* | |
1219 | * Copy the entries field by field. | |
1220 | */ | |
1221 | for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp), | |
1222 | oldsfep = XFS_DIR2_SF_FIRSTENTRY(oldsfp); | |
1223 | i < sfp->hdr.count; | |
1224 | i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep), | |
1225 | oldsfep = XFS_DIR2_SF_NEXTENTRY(oldsfp, oldsfep)) { | |
1226 | sfep->namelen = oldsfep->namelen; | |
1227 | sfep->offset = oldsfep->offset; | |
1228 | memcpy(sfep->name, oldsfep->name, sfep->namelen); | |
1229 | ino = XFS_DIR2_SF_GET_INUMBER(oldsfp, | |
1230 | XFS_DIR2_SF_INUMBERP(oldsfep)); | |
1231 | XFS_DIR2_SF_PUT_INUMBER(sfp, &ino, XFS_DIR2_SF_INUMBERP(sfep)); | |
1232 | } | |
1233 | /* | |
1234 | * Clean up the inode. | |
1235 | */ | |
1236 | kmem_free(buf, oldsize); | |
1237 | dp->i_d.di_size = newsize; | |
1238 | xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA); | |
1239 | } | |
1240 | ||
1241 | /* | |
1242 | * Convert from 4-byte inode numbers to 8-byte inode numbers. | |
1243 | * The new 8-byte inode number is not there yet, we leave with the | |
1244 | * count 1 but no corresponding entry. | |
1245 | */ | |
1246 | static void | |
1247 | xfs_dir2_sf_toino8( | |
1248 | xfs_da_args_t *args) /* operation arguments */ | |
1249 | { | |
1250 | char *buf; /* old dir's buffer */ | |
1251 | xfs_inode_t *dp; /* incore directory inode */ | |
1252 | int i; /* entry index */ | |
1253 | xfs_ino_t ino; /* entry inode number */ | |
1254 | int newsize; /* new inode size */ | |
1255 | xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */ | |
1256 | xfs_dir2_sf_t *oldsfp; /* old sf directory */ | |
1257 | int oldsize; /* old inode size */ | |
1258 | xfs_dir2_sf_entry_t *sfep; /* new sf entry */ | |
1259 | xfs_dir2_sf_t *sfp; /* new sf directory */ | |
1260 | ||
1261 | xfs_dir2_trace_args("sf_toino8", args); | |
1262 | dp = args->dp; | |
1263 | ||
1264 | /* | |
1265 | * Copy the old directory to the buffer. | |
1266 | * Then nuke it from the inode, and add the new buffer to the inode. | |
1267 | * Don't want xfs_idata_realloc copying the data here. | |
1268 | */ | |
1269 | oldsize = dp->i_df.if_bytes; | |
1270 | buf = kmem_alloc(oldsize, KM_SLEEP); | |
1271 | oldsfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; | |
1272 | ASSERT(oldsfp->hdr.i8count == 0); | |
1273 | memcpy(buf, oldsfp, oldsize); | |
1274 | /* | |
1275 | * Compute the new inode size. | |
1276 | */ | |
1277 | newsize = | |
1278 | oldsize + | |
1279 | (oldsfp->hdr.count + 1) * | |
1280 | ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t)); | |
1281 | xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK); | |
1282 | xfs_idata_realloc(dp, newsize, XFS_DATA_FORK); | |
1283 | /* | |
1284 | * Reset our pointers, the data has moved. | |
1285 | */ | |
1286 | oldsfp = (xfs_dir2_sf_t *)buf; | |
1287 | sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data; | |
1288 | /* | |
1289 | * Fill in the new header. | |
1290 | */ | |
1291 | sfp->hdr.count = oldsfp->hdr.count; | |
1292 | sfp->hdr.i8count = 1; | |
1293 | ino = XFS_DIR2_SF_GET_INUMBER(oldsfp, &oldsfp->hdr.parent); | |
1294 | XFS_DIR2_SF_PUT_INUMBER(sfp, &ino, &sfp->hdr.parent); | |
1295 | /* | |
1296 | * Copy the entries field by field. | |
1297 | */ | |
1298 | for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp), | |
1299 | oldsfep = XFS_DIR2_SF_FIRSTENTRY(oldsfp); | |
1300 | i < sfp->hdr.count; | |
1301 | i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep), | |
1302 | oldsfep = XFS_DIR2_SF_NEXTENTRY(oldsfp, oldsfep)) { | |
1303 | sfep->namelen = oldsfep->namelen; | |
1304 | sfep->offset = oldsfep->offset; | |
1305 | memcpy(sfep->name, oldsfep->name, sfep->namelen); | |
1306 | ino = XFS_DIR2_SF_GET_INUMBER(oldsfp, | |
1307 | XFS_DIR2_SF_INUMBERP(oldsfep)); | |
1308 | XFS_DIR2_SF_PUT_INUMBER(sfp, &ino, XFS_DIR2_SF_INUMBERP(sfep)); | |
1309 | } | |
1310 | /* | |
1311 | * Clean up the inode. | |
1312 | */ | |
1313 | kmem_free(buf, oldsize); | |
1314 | dp->i_d.di_size = newsize; | |
1315 | xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA); | |
1316 | } | |
1317 | #endif /* XFS_BIG_INUMS */ |