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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#include "xfs.h"
7#include "xfs_fs.h"
8#include "xfs_shared.h"
9#include "xfs_format.h"
10#include "xfs_log_format.h"
11#include "xfs_trans_resv.h"
12#include "xfs_mount.h"
13#include "xfs_inode.h"
14#include "xfs_trans.h"
15#include "xfs_dir2.h"
16#include "xfs_dir2_priv.h"
17#include "xfs_trace.h"
18
19/*
20 * Prototypes for internal functions.
21 */
22static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args,
23 xfs_dir2_sf_entry_t *sfep,
24 xfs_dir2_data_aoff_t offset,
25 int new_isize);
26static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange,
27 int new_isize);
28static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange,
29 xfs_dir2_sf_entry_t **sfepp,
30 xfs_dir2_data_aoff_t *offsetp);
31#ifdef DEBUG
32static void xfs_dir2_sf_check(xfs_da_args_t *args);
33#else
34#define xfs_dir2_sf_check(args)
35#endif /* DEBUG */
36
37static void xfs_dir2_sf_toino4(xfs_da_args_t *args);
38static void xfs_dir2_sf_toino8(xfs_da_args_t *args);
39
40int
41xfs_dir2_sf_entsize(
42 struct xfs_mount *mp,
43 struct xfs_dir2_sf_hdr *hdr,
44 int len)
45{
46 int count = len;
47
48 count += sizeof(struct xfs_dir2_sf_entry); /* namelen + offset */
49 count += hdr->i8count ? XFS_INO64_SIZE : XFS_INO32_SIZE; /* ino # */
50
51 if (xfs_has_ftype(mp))
52 count += sizeof(uint8_t);
53 return count;
54}
55
56struct xfs_dir2_sf_entry *
57xfs_dir2_sf_nextentry(
58 struct xfs_mount *mp,
59 struct xfs_dir2_sf_hdr *hdr,
60 struct xfs_dir2_sf_entry *sfep)
61{
62 return (void *)sfep + xfs_dir2_sf_entsize(mp, hdr, sfep->namelen);
63}
64
65/*
66 * In short-form directory entries the inode numbers are stored at variable
67 * offset behind the entry name. If the entry stores a filetype value, then it
68 * sits between the name and the inode number. The actual inode numbers can
69 * come in two formats as well, either 4 bytes or 8 bytes wide.
70 */
71xfs_ino_t
72xfs_dir2_sf_get_ino(
73 struct xfs_mount *mp,
74 struct xfs_dir2_sf_hdr *hdr,
75 struct xfs_dir2_sf_entry *sfep)
76{
77 uint8_t *from = sfep->name + sfep->namelen;
78
79 if (xfs_has_ftype(mp))
80 from++;
81
82 if (!hdr->i8count)
83 return get_unaligned_be32(from);
84 return get_unaligned_be64(from) & XFS_MAXINUMBER;
85}
86
87void
88xfs_dir2_sf_put_ino(
89 struct xfs_mount *mp,
90 struct xfs_dir2_sf_hdr *hdr,
91 struct xfs_dir2_sf_entry *sfep,
92 xfs_ino_t ino)
93{
94 uint8_t *to = sfep->name + sfep->namelen;
95
96 ASSERT(ino <= XFS_MAXINUMBER);
97
98 if (xfs_has_ftype(mp))
99 to++;
100
101 if (hdr->i8count)
102 put_unaligned_be64(ino, to);
103 else
104 put_unaligned_be32(ino, to);
105}
106
107xfs_ino_t
108xfs_dir2_sf_get_parent_ino(
109 struct xfs_dir2_sf_hdr *hdr)
110{
111 if (!hdr->i8count)
112 return get_unaligned_be32(hdr->parent);
113 return get_unaligned_be64(hdr->parent) & XFS_MAXINUMBER;
114}
115
116void
117xfs_dir2_sf_put_parent_ino(
118 struct xfs_dir2_sf_hdr *hdr,
119 xfs_ino_t ino)
120{
121 ASSERT(ino <= XFS_MAXINUMBER);
122
123 if (hdr->i8count)
124 put_unaligned_be64(ino, hdr->parent);
125 else
126 put_unaligned_be32(ino, hdr->parent);
127}
128
129/*
130 * The file type field is stored at the end of the name for filetype enabled
131 * shortform directories, or not at all otherwise.
132 */
133uint8_t
134xfs_dir2_sf_get_ftype(
135 struct xfs_mount *mp,
136 struct xfs_dir2_sf_entry *sfep)
137{
138 if (xfs_has_ftype(mp)) {
139 uint8_t ftype = sfep->name[sfep->namelen];
140
141 if (ftype < XFS_DIR3_FT_MAX)
142 return ftype;
143 }
144
145 return XFS_DIR3_FT_UNKNOWN;
146}
147
148void
149xfs_dir2_sf_put_ftype(
150 struct xfs_mount *mp,
151 struct xfs_dir2_sf_entry *sfep,
152 uint8_t ftype)
153{
154 ASSERT(ftype < XFS_DIR3_FT_MAX);
155
156 if (xfs_has_ftype(mp))
157 sfep->name[sfep->namelen] = ftype;
158}
159
160/*
161 * Given a block directory (dp/block), calculate its size as a shortform (sf)
162 * directory and a header for the sf directory, if it will fit it the
163 * space currently present in the inode. If it won't fit, the output
164 * size is too big (but not accurate).
165 */
166int /* size for sf form */
167xfs_dir2_block_sfsize(
168 xfs_inode_t *dp, /* incore inode pointer */
169 xfs_dir2_data_hdr_t *hdr, /* block directory data */
170 xfs_dir2_sf_hdr_t *sfhp) /* output: header for sf form */
171{
172 xfs_dir2_dataptr_t addr; /* data entry address */
173 xfs_dir2_leaf_entry_t *blp; /* leaf area of the block */
174 xfs_dir2_block_tail_t *btp; /* tail area of the block */
175 int count; /* shortform entry count */
176 xfs_dir2_data_entry_t *dep; /* data entry in the block */
177 int i; /* block entry index */
178 int i8count; /* count of big-inode entries */
179 int isdot; /* entry is "." */
180 int isdotdot; /* entry is ".." */
181 xfs_mount_t *mp; /* mount structure pointer */
182 int namelen; /* total name bytes */
183 xfs_ino_t parent = 0; /* parent inode number */
184 int size=0; /* total computed size */
185 int has_ftype;
186 struct xfs_da_geometry *geo;
187
188 mp = dp->i_mount;
189 geo = mp->m_dir_geo;
190
191 /*
192 * if there is a filetype field, add the extra byte to the namelen
193 * for each entry that we see.
194 */
195 has_ftype = xfs_has_ftype(mp) ? 1 : 0;
196
197 count = i8count = namelen = 0;
198 btp = xfs_dir2_block_tail_p(geo, hdr);
199 blp = xfs_dir2_block_leaf_p(btp);
200
201 /*
202 * Iterate over the block's data entries by using the leaf pointers.
203 */
204 for (i = 0; i < be32_to_cpu(btp->count); i++) {
205 if ((addr = be32_to_cpu(blp[i].address)) == XFS_DIR2_NULL_DATAPTR)
206 continue;
207 /*
208 * Calculate the pointer to the entry at hand.
209 */
210 dep = (xfs_dir2_data_entry_t *)((char *)hdr +
211 xfs_dir2_dataptr_to_off(geo, addr));
212 /*
213 * Detect . and .., so we can special-case them.
214 * . is not included in sf directories.
215 * .. is included by just the parent inode number.
216 */
217 isdot = dep->namelen == 1 && dep->name[0] == '.';
218 isdotdot =
219 dep->namelen == 2 &&
220 dep->name[0] == '.' && dep->name[1] == '.';
221
222 if (!isdot)
223 i8count += be64_to_cpu(dep->inumber) > XFS_DIR2_MAX_SHORT_INUM;
224
225 /* take into account the file type field */
226 if (!isdot && !isdotdot) {
227 count++;
228 namelen += dep->namelen + has_ftype;
229 } else if (isdotdot)
230 parent = be64_to_cpu(dep->inumber);
231 /*
232 * Calculate the new size, see if we should give up yet.
233 */
234 size = xfs_dir2_sf_hdr_size(i8count) + /* header */
235 count * 3 * sizeof(u8) + /* namelen + offset */
236 namelen + /* name */
237 (i8count ? /* inumber */
238 count * XFS_INO64_SIZE :
239 count * XFS_INO32_SIZE);
240 if (size > xfs_inode_data_fork_size(dp))
241 return size; /* size value is a failure */
242 }
243 /*
244 * Create the output header, if it worked.
245 */
246 sfhp->count = count;
247 sfhp->i8count = i8count;
248 xfs_dir2_sf_put_parent_ino(sfhp, parent);
249 return size;
250}
251
252/*
253 * Convert a block format directory to shortform.
254 * Caller has already checked that it will fit, and built us a header.
255 */
256int /* error */
257xfs_dir2_block_to_sf(
258 struct xfs_da_args *args, /* operation arguments */
259 struct xfs_buf *bp,
260 int size, /* shortform directory size */
261 struct xfs_dir2_sf_hdr *sfhp) /* shortform directory hdr */
262{
263 struct xfs_inode *dp = args->dp;
264 struct xfs_mount *mp = dp->i_mount;
265 int error; /* error return value */
266 int logflags; /* inode logging flags */
267 struct xfs_dir2_sf_entry *sfep; /* shortform entry */
268 struct xfs_dir2_sf_hdr *sfp; /* shortform directory header */
269 unsigned int offset = args->geo->data_entry_offset;
270 unsigned int end;
271
272 trace_xfs_dir2_block_to_sf(args);
273
274 /*
275 * Allocate a temporary destination buffer the size of the inode to
276 * format the data into. Once we have formatted the data, we can free
277 * the block and copy the formatted data into the inode literal area.
278 */
279 sfp = kmem_alloc(mp->m_sb.sb_inodesize, 0);
280 memcpy(sfp, sfhp, xfs_dir2_sf_hdr_size(sfhp->i8count));
281
282 /*
283 * Loop over the active and unused entries. Stop when we reach the
284 * leaf/tail portion of the block.
285 */
286 end = xfs_dir3_data_end_offset(args->geo, bp->b_addr);
287 sfep = xfs_dir2_sf_firstentry(sfp);
288 while (offset < end) {
289 struct xfs_dir2_data_unused *dup = bp->b_addr + offset;
290 struct xfs_dir2_data_entry *dep = bp->b_addr + offset;
291
292 /*
293 * If it's unused, just skip over it.
294 */
295 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
296 offset += be16_to_cpu(dup->length);
297 continue;
298 }
299
300 /*
301 * Skip .
302 */
303 if (dep->namelen == 1 && dep->name[0] == '.')
304 ASSERT(be64_to_cpu(dep->inumber) == dp->i_ino);
305 /*
306 * Skip .., but make sure the inode number is right.
307 */
308 else if (dep->namelen == 2 &&
309 dep->name[0] == '.' && dep->name[1] == '.')
310 ASSERT(be64_to_cpu(dep->inumber) ==
311 xfs_dir2_sf_get_parent_ino(sfp));
312 /*
313 * Normal entry, copy it into shortform.
314 */
315 else {
316 sfep->namelen = dep->namelen;
317 xfs_dir2_sf_put_offset(sfep, offset);
318 memcpy(sfep->name, dep->name, dep->namelen);
319 xfs_dir2_sf_put_ino(mp, sfp, sfep,
320 be64_to_cpu(dep->inumber));
321 xfs_dir2_sf_put_ftype(mp, sfep,
322 xfs_dir2_data_get_ftype(mp, dep));
323
324 sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep);
325 }
326 offset += xfs_dir2_data_entsize(mp, dep->namelen);
327 }
328 ASSERT((char *)sfep - (char *)sfp == size);
329
330 /* now we are done with the block, we can shrink the inode */
331 logflags = XFS_ILOG_CORE;
332 error = xfs_dir2_shrink_inode(args, args->geo->datablk, bp);
333 if (error) {
334 ASSERT(error != -ENOSPC);
335 goto out;
336 }
337
338 /*
339 * The buffer is now unconditionally gone, whether
340 * xfs_dir2_shrink_inode worked or not.
341 *
342 * Convert the inode to local format and copy the data in.
343 */
344 ASSERT(dp->i_df.if_bytes == 0);
345 xfs_init_local_fork(dp, XFS_DATA_FORK, sfp, size);
346 dp->i_df.if_format = XFS_DINODE_FMT_LOCAL;
347 dp->i_disk_size = size;
348
349 logflags |= XFS_ILOG_DDATA;
350 xfs_dir2_sf_check(args);
351out:
352 xfs_trans_log_inode(args->trans, dp, logflags);
353 kmem_free(sfp);
354 return error;
355}
356
357/*
358 * Add a name to a shortform directory.
359 * There are two algorithms, "easy" and "hard" which we decide on
360 * before changing anything.
361 * Convert to block form if necessary, if the new entry won't fit.
362 */
363int /* error */
364xfs_dir2_sf_addname(
365 xfs_da_args_t *args) /* operation arguments */
366{
367 struct xfs_inode *dp = args->dp;
368 struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;
369 int error; /* error return value */
370 int incr_isize; /* total change in size */
371 int new_isize; /* size after adding name */
372 int objchange; /* changing to 8-byte inodes */
373 xfs_dir2_data_aoff_t offset = 0; /* offset for new entry */
374 int pick; /* which algorithm to use */
375 xfs_dir2_sf_entry_t *sfep = NULL; /* shortform entry */
376
377 trace_xfs_dir2_sf_addname(args);
378
379 ASSERT(xfs_dir2_sf_lookup(args) == -ENOENT);
380 ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL);
381 ASSERT(dp->i_disk_size >= offsetof(struct xfs_dir2_sf_hdr, parent));
382 ASSERT(dp->i_df.if_bytes == dp->i_disk_size);
383 ASSERT(sfp != NULL);
384 ASSERT(dp->i_disk_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
385 /*
386 * Compute entry (and change in) size.
387 */
388 incr_isize = xfs_dir2_sf_entsize(dp->i_mount, sfp, args->namelen);
389 objchange = 0;
390
391 /*
392 * Do we have to change to 8 byte inodes?
393 */
394 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
395 /*
396 * Yes, adjust the inode size. old count + (parent + new)
397 */
398 incr_isize += (sfp->count + 2) * XFS_INO64_DIFF;
399 objchange = 1;
400 }
401
402 new_isize = (int)dp->i_disk_size + incr_isize;
403 /*
404 * Won't fit as shortform any more (due to size),
405 * or the pick routine says it won't (due to offset values).
406 */
407 if (new_isize > xfs_inode_data_fork_size(dp) ||
408 (pick =
409 xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) {
410 /*
411 * Just checking or no space reservation, it doesn't fit.
412 */
413 if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0)
414 return -ENOSPC;
415 /*
416 * Convert to block form then add the name.
417 */
418 error = xfs_dir2_sf_to_block(args);
419 if (error)
420 return error;
421 return xfs_dir2_block_addname(args);
422 }
423 /*
424 * Just checking, it fits.
425 */
426 if (args->op_flags & XFS_DA_OP_JUSTCHECK)
427 return 0;
428 /*
429 * Do it the easy way - just add it at the end.
430 */
431 if (pick == 1)
432 xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize);
433 /*
434 * Do it the hard way - look for a place to insert the new entry.
435 * Convert to 8 byte inode numbers first if necessary.
436 */
437 else {
438 ASSERT(pick == 2);
439 if (objchange)
440 xfs_dir2_sf_toino8(args);
441 xfs_dir2_sf_addname_hard(args, objchange, new_isize);
442 }
443 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
444 return 0;
445}
446
447/*
448 * Add the new entry the "easy" way.
449 * This is copying the old directory and adding the new entry at the end.
450 * Since it's sorted by "offset" we need room after the last offset
451 * that's already there, and then room to convert to a block directory.
452 * This is already checked by the pick routine.
453 */
454static void
455xfs_dir2_sf_addname_easy(
456 xfs_da_args_t *args, /* operation arguments */
457 xfs_dir2_sf_entry_t *sfep, /* pointer to new entry */
458 xfs_dir2_data_aoff_t offset, /* offset to use for new ent */
459 int new_isize) /* new directory size */
460{
461 struct xfs_inode *dp = args->dp;
462 struct xfs_mount *mp = dp->i_mount;
463 struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;
464 int byteoff = (int)((char *)sfep - (char *)sfp);
465
466 /*
467 * Grow the in-inode space.
468 */
469 sfp = xfs_idata_realloc(dp, xfs_dir2_sf_entsize(mp, sfp, args->namelen),
470 XFS_DATA_FORK);
471 /*
472 * Need to set up again due to realloc of the inode data.
473 */
474 sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + byteoff);
475 /*
476 * Fill in the new entry.
477 */
478 sfep->namelen = args->namelen;
479 xfs_dir2_sf_put_offset(sfep, offset);
480 memcpy(sfep->name, args->name, sfep->namelen);
481 xfs_dir2_sf_put_ino(mp, sfp, sfep, args->inumber);
482 xfs_dir2_sf_put_ftype(mp, sfep, args->filetype);
483
484 /*
485 * Update the header and inode.
486 */
487 sfp->count++;
488 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM)
489 sfp->i8count++;
490 dp->i_disk_size = new_isize;
491 xfs_dir2_sf_check(args);
492}
493
494/*
495 * Add the new entry the "hard" way.
496 * The caller has already converted to 8 byte inode numbers if necessary,
497 * in which case we need to leave the i8count at 1.
498 * Find a hole that the new entry will fit into, and copy
499 * the first part of the entries, the new entry, and the last part of
500 * the entries.
501 */
502/* ARGSUSED */
503static void
504xfs_dir2_sf_addname_hard(
505 xfs_da_args_t *args, /* operation arguments */
506 int objchange, /* changing inode number size */
507 int new_isize) /* new directory size */
508{
509 struct xfs_inode *dp = args->dp;
510 struct xfs_mount *mp = dp->i_mount;
511 int add_datasize; /* data size need for new ent */
512 char *buf; /* buffer for old */
513 int eof; /* reached end of old dir */
514 int nbytes; /* temp for byte copies */
515 xfs_dir2_data_aoff_t new_offset; /* next offset value */
516 xfs_dir2_data_aoff_t offset; /* current offset value */
517 int old_isize; /* previous size */
518 xfs_dir2_sf_entry_t *oldsfep; /* entry in original dir */
519 xfs_dir2_sf_hdr_t *oldsfp; /* original shortform dir */
520 xfs_dir2_sf_entry_t *sfep; /* entry in new dir */
521 xfs_dir2_sf_hdr_t *sfp; /* new shortform dir */
522
523 /*
524 * Copy the old directory to the stack buffer.
525 */
526 old_isize = (int)dp->i_disk_size;
527 buf = kmem_alloc(old_isize, 0);
528 oldsfp = (xfs_dir2_sf_hdr_t *)buf;
529 memcpy(oldsfp, dp->i_df.if_data, old_isize);
530 /*
531 * Loop over the old directory finding the place we're going
532 * to insert the new entry.
533 * If it's going to end up at the end then oldsfep will point there.
534 */
535 for (offset = args->geo->data_first_offset,
536 oldsfep = xfs_dir2_sf_firstentry(oldsfp),
537 add_datasize = xfs_dir2_data_entsize(mp, args->namelen),
538 eof = (char *)oldsfep == &buf[old_isize];
539 !eof;
540 offset = new_offset + xfs_dir2_data_entsize(mp, oldsfep->namelen),
541 oldsfep = xfs_dir2_sf_nextentry(mp, oldsfp, oldsfep),
542 eof = (char *)oldsfep == &buf[old_isize]) {
543 new_offset = xfs_dir2_sf_get_offset(oldsfep);
544 if (offset + add_datasize <= new_offset)
545 break;
546 }
547 /*
548 * Get rid of the old directory, then allocate space for
549 * the new one. We do this so xfs_idata_realloc won't copy
550 * the data.
551 */
552 xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK);
553 sfp = xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK);
554
555 /*
556 * Copy the first part of the directory, including the header.
557 */
558 nbytes = (int)((char *)oldsfep - (char *)oldsfp);
559 memcpy(sfp, oldsfp, nbytes);
560 sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes);
561 /*
562 * Fill in the new entry, and update the header counts.
563 */
564 sfep->namelen = args->namelen;
565 xfs_dir2_sf_put_offset(sfep, offset);
566 memcpy(sfep->name, args->name, sfep->namelen);
567 xfs_dir2_sf_put_ino(mp, sfp, sfep, args->inumber);
568 xfs_dir2_sf_put_ftype(mp, sfep, args->filetype);
569 sfp->count++;
570 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange)
571 sfp->i8count++;
572 /*
573 * If there's more left to copy, do that.
574 */
575 if (!eof) {
576 sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep);
577 memcpy(sfep, oldsfep, old_isize - nbytes);
578 }
579 kmem_free(buf);
580 dp->i_disk_size = new_isize;
581 xfs_dir2_sf_check(args);
582}
583
584/*
585 * Decide if the new entry will fit at all.
586 * If it will fit, pick between adding the new entry to the end (easy)
587 * or somewhere else (hard).
588 * Return 0 (won't fit), 1 (easy), 2 (hard).
589 */
590/*ARGSUSED*/
591static int /* pick result */
592xfs_dir2_sf_addname_pick(
593 xfs_da_args_t *args, /* operation arguments */
594 int objchange, /* inode # size changes */
595 xfs_dir2_sf_entry_t **sfepp, /* out(1): new entry ptr */
596 xfs_dir2_data_aoff_t *offsetp) /* out(1): new offset */
597{
598 struct xfs_inode *dp = args->dp;
599 struct xfs_mount *mp = dp->i_mount;
600 int holefit; /* found hole it will fit in */
601 int i; /* entry number */
602 xfs_dir2_data_aoff_t offset; /* data block offset */
603 xfs_dir2_sf_entry_t *sfep; /* shortform entry */
604 struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;
605 int size; /* entry's data size */
606 int used; /* data bytes used */
607
608 size = xfs_dir2_data_entsize(mp, args->namelen);
609 offset = args->geo->data_first_offset;
610 sfep = xfs_dir2_sf_firstentry(sfp);
611 holefit = 0;
612 /*
613 * Loop over sf entries.
614 * Keep track of data offset and whether we've seen a place
615 * to insert the new entry.
616 */
617 for (i = 0; i < sfp->count; i++) {
618 if (!holefit)
619 holefit = offset + size <= xfs_dir2_sf_get_offset(sfep);
620 offset = xfs_dir2_sf_get_offset(sfep) +
621 xfs_dir2_data_entsize(mp, sfep->namelen);
622 sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep);
623 }
624 /*
625 * Calculate data bytes used excluding the new entry, if this
626 * was a data block (block form directory).
627 */
628 used = offset +
629 (sfp->count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
630 (uint)sizeof(xfs_dir2_block_tail_t);
631 /*
632 * If it won't fit in a block form then we can't insert it,
633 * we'll go back, convert to block, then try the insert and convert
634 * to leaf.
635 */
636 if (used + (holefit ? 0 : size) > args->geo->blksize)
637 return 0;
638 /*
639 * If changing the inode number size, do it the hard way.
640 */
641 if (objchange)
642 return 2;
643 /*
644 * If it won't fit at the end then do it the hard way (use the hole).
645 */
646 if (used + size > args->geo->blksize)
647 return 2;
648 /*
649 * Do it the easy way.
650 */
651 *sfepp = sfep;
652 *offsetp = offset;
653 return 1;
654}
655
656#ifdef DEBUG
657/*
658 * Check consistency of shortform directory, assert if bad.
659 */
660static void
661xfs_dir2_sf_check(
662 xfs_da_args_t *args) /* operation arguments */
663{
664 struct xfs_inode *dp = args->dp;
665 struct xfs_mount *mp = dp->i_mount;
666 struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;
667 int i; /* entry number */
668 int i8count; /* number of big inode#s */
669 xfs_ino_t ino; /* entry inode number */
670 int offset; /* data offset */
671 xfs_dir2_sf_entry_t *sfep; /* shortform dir entry */
672
673 offset = args->geo->data_first_offset;
674 ino = xfs_dir2_sf_get_parent_ino(sfp);
675 i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
676
677 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
678 i < sfp->count;
679 i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep)) {
680 ASSERT(xfs_dir2_sf_get_offset(sfep) >= offset);
681 ino = xfs_dir2_sf_get_ino(mp, sfp, sfep);
682 i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
683 offset =
684 xfs_dir2_sf_get_offset(sfep) +
685 xfs_dir2_data_entsize(mp, sfep->namelen);
686 ASSERT(xfs_dir2_sf_get_ftype(mp, sfep) < XFS_DIR3_FT_MAX);
687 }
688 ASSERT(i8count == sfp->i8count);
689 ASSERT((char *)sfep - (char *)sfp == dp->i_disk_size);
690 ASSERT(offset +
691 (sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
692 (uint)sizeof(xfs_dir2_block_tail_t) <= args->geo->blksize);
693}
694#endif /* DEBUG */
695
696/* Verify the consistency of an inline directory. */
697xfs_failaddr_t
698xfs_dir2_sf_verify(
699 struct xfs_mount *mp,
700 struct xfs_dir2_sf_hdr *sfp,
701 int64_t size)
702{
703 struct xfs_dir2_sf_entry *sfep;
704 struct xfs_dir2_sf_entry *next_sfep;
705 char *endp;
706 xfs_ino_t ino;
707 int i;
708 int i8count;
709 int offset;
710 int error;
711 uint8_t filetype;
712
713 /*
714 * Give up if the directory is way too short.
715 */
716 if (size <= offsetof(struct xfs_dir2_sf_hdr, parent) ||
717 size < xfs_dir2_sf_hdr_size(sfp->i8count))
718 return __this_address;
719
720 endp = (char *)sfp + size;
721
722 /* Check .. entry */
723 ino = xfs_dir2_sf_get_parent_ino(sfp);
724 i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
725 error = xfs_dir_ino_validate(mp, ino);
726 if (error)
727 return __this_address;
728 offset = mp->m_dir_geo->data_first_offset;
729
730 /* Check all reported entries */
731 sfep = xfs_dir2_sf_firstentry(sfp);
732 for (i = 0; i < sfp->count; i++) {
733 /*
734 * struct xfs_dir2_sf_entry has a variable length.
735 * Check the fixed-offset parts of the structure are
736 * within the data buffer.
737 */
738 if (((char *)sfep + sizeof(*sfep)) >= endp)
739 return __this_address;
740
741 /* Don't allow names with known bad length. */
742 if (sfep->namelen == 0)
743 return __this_address;
744
745 /*
746 * Check that the variable-length part of the structure is
747 * within the data buffer. The next entry starts after the
748 * name component, so nextentry is an acceptable test.
749 */
750 next_sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep);
751 if (endp < (char *)next_sfep)
752 return __this_address;
753
754 /* Check that the offsets always increase. */
755 if (xfs_dir2_sf_get_offset(sfep) < offset)
756 return __this_address;
757
758 /* Check the inode number. */
759 ino = xfs_dir2_sf_get_ino(mp, sfp, sfep);
760 i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
761 error = xfs_dir_ino_validate(mp, ino);
762 if (error)
763 return __this_address;
764
765 /* Check the file type. */
766 filetype = xfs_dir2_sf_get_ftype(mp, sfep);
767 if (filetype >= XFS_DIR3_FT_MAX)
768 return __this_address;
769
770 offset = xfs_dir2_sf_get_offset(sfep) +
771 xfs_dir2_data_entsize(mp, sfep->namelen);
772
773 sfep = next_sfep;
774 }
775 if (i8count != sfp->i8count)
776 return __this_address;
777 if ((void *)sfep != (void *)endp)
778 return __this_address;
779
780 /* Make sure this whole thing ought to be in local format. */
781 if (offset + (sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
782 (uint)sizeof(xfs_dir2_block_tail_t) > mp->m_dir_geo->blksize)
783 return __this_address;
784
785 return NULL;
786}
787
788/*
789 * Create a new (shortform) directory.
790 */
791int /* error, always 0 */
792xfs_dir2_sf_create(
793 xfs_da_args_t *args, /* operation arguments */
794 xfs_ino_t pino) /* parent inode number */
795{
796 xfs_inode_t *dp; /* incore directory inode */
797 int i8count; /* parent inode is an 8-byte number */
798 xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
799 int size; /* directory size */
800
801 trace_xfs_dir2_sf_create(args);
802
803 dp = args->dp;
804
805 ASSERT(dp != NULL);
806 ASSERT(dp->i_disk_size == 0);
807 /*
808 * If it's currently a zero-length extent file,
809 * convert it to local format.
810 */
811 if (dp->i_df.if_format == XFS_DINODE_FMT_EXTENTS) {
812 dp->i_df.if_format = XFS_DINODE_FMT_LOCAL;
813 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
814 }
815 ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL);
816 ASSERT(dp->i_df.if_bytes == 0);
817 i8count = pino > XFS_DIR2_MAX_SHORT_INUM;
818 size = xfs_dir2_sf_hdr_size(i8count);
819
820 /*
821 * Make a buffer for the data and fill in the header.
822 */
823 sfp = xfs_idata_realloc(dp, size, XFS_DATA_FORK);
824 sfp->i8count = i8count;
825
826 /*
827 * Now can put in the inode number, since i8count is set.
828 */
829 xfs_dir2_sf_put_parent_ino(sfp, pino);
830 sfp->count = 0;
831 dp->i_disk_size = size;
832 xfs_dir2_sf_check(args);
833 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
834 return 0;
835}
836
837/*
838 * Lookup an entry in a shortform directory.
839 * Returns EEXIST if found, ENOENT if not found.
840 */
841int /* error */
842xfs_dir2_sf_lookup(
843 xfs_da_args_t *args) /* operation arguments */
844{
845 struct xfs_inode *dp = args->dp;
846 struct xfs_mount *mp = dp->i_mount;
847 struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;
848 int i; /* entry index */
849 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
850 enum xfs_dacmp cmp; /* comparison result */
851 xfs_dir2_sf_entry_t *ci_sfep; /* case-insens. entry */
852
853 trace_xfs_dir2_sf_lookup(args);
854
855 xfs_dir2_sf_check(args);
856
857 ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL);
858 ASSERT(dp->i_disk_size >= offsetof(struct xfs_dir2_sf_hdr, parent));
859 ASSERT(dp->i_df.if_bytes == dp->i_disk_size);
860 ASSERT(sfp != NULL);
861 ASSERT(dp->i_disk_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
862 /*
863 * Special case for .
864 */
865 if (args->namelen == 1 && args->name[0] == '.') {
866 args->inumber = dp->i_ino;
867 args->cmpresult = XFS_CMP_EXACT;
868 args->filetype = XFS_DIR3_FT_DIR;
869 return -EEXIST;
870 }
871 /*
872 * Special case for ..
873 */
874 if (args->namelen == 2 &&
875 args->name[0] == '.' && args->name[1] == '.') {
876 args->inumber = xfs_dir2_sf_get_parent_ino(sfp);
877 args->cmpresult = XFS_CMP_EXACT;
878 args->filetype = XFS_DIR3_FT_DIR;
879 return -EEXIST;
880 }
881 /*
882 * Loop over all the entries trying to match ours.
883 */
884 ci_sfep = NULL;
885 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
886 i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep)) {
887 /*
888 * Compare name and if it's an exact match, return the inode
889 * number. If it's the first case-insensitive match, store the
890 * inode number and continue looking for an exact match.
891 */
892 cmp = xfs_dir2_compname(args, sfep->name, sfep->namelen);
893 if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
894 args->cmpresult = cmp;
895 args->inumber = xfs_dir2_sf_get_ino(mp, sfp, sfep);
896 args->filetype = xfs_dir2_sf_get_ftype(mp, sfep);
897 if (cmp == XFS_CMP_EXACT)
898 return -EEXIST;
899 ci_sfep = sfep;
900 }
901 }
902 ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
903 /*
904 * Here, we can only be doing a lookup (not a rename or replace).
905 * If a case-insensitive match was not found, return -ENOENT.
906 */
907 if (!ci_sfep)
908 return -ENOENT;
909 /* otherwise process the CI match as required by the caller */
910 return xfs_dir_cilookup_result(args, ci_sfep->name, ci_sfep->namelen);
911}
912
913/*
914 * Remove an entry from a shortform directory.
915 */
916int /* error */
917xfs_dir2_sf_removename(
918 xfs_da_args_t *args)
919{
920 struct xfs_inode *dp = args->dp;
921 struct xfs_mount *mp = dp->i_mount;
922 struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;
923 int byteoff; /* offset of removed entry */
924 int entsize; /* this entry's size */
925 int i; /* shortform entry index */
926 int newsize; /* new inode size */
927 int oldsize; /* old inode size */
928 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
929
930 trace_xfs_dir2_sf_removename(args);
931
932 ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL);
933 oldsize = (int)dp->i_disk_size;
934 ASSERT(oldsize >= offsetof(struct xfs_dir2_sf_hdr, parent));
935 ASSERT(dp->i_df.if_bytes == oldsize);
936 ASSERT(sfp != NULL);
937 ASSERT(oldsize >= xfs_dir2_sf_hdr_size(sfp->i8count));
938 /*
939 * Loop over the old directory entries.
940 * Find the one we're deleting.
941 */
942 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
943 i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep)) {
944 if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
945 XFS_CMP_EXACT) {
946 ASSERT(xfs_dir2_sf_get_ino(mp, sfp, sfep) ==
947 args->inumber);
948 break;
949 }
950 }
951 /*
952 * Didn't find it.
953 */
954 if (i == sfp->count)
955 return -ENOENT;
956 /*
957 * Calculate sizes.
958 */
959 byteoff = (int)((char *)sfep - (char *)sfp);
960 entsize = xfs_dir2_sf_entsize(mp, sfp, args->namelen);
961 newsize = oldsize - entsize;
962 /*
963 * Copy the part if any after the removed entry, sliding it down.
964 */
965 if (byteoff + entsize < oldsize)
966 memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize,
967 oldsize - (byteoff + entsize));
968 /*
969 * Fix up the header and file size.
970 */
971 sfp->count--;
972 dp->i_disk_size = newsize;
973
974 /*
975 * Reallocate, making it smaller.
976 */
977 sfp = xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
978
979 /*
980 * Are we changing inode number size?
981 */
982 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
983 if (sfp->i8count == 1)
984 xfs_dir2_sf_toino4(args);
985 else
986 sfp->i8count--;
987 }
988 xfs_dir2_sf_check(args);
989 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
990 return 0;
991}
992
993/*
994 * Check whether the sf dir replace operation need more blocks.
995 */
996static bool
997xfs_dir2_sf_replace_needblock(
998 struct xfs_inode *dp,
999 xfs_ino_t inum)
1000{
1001 struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;
1002 int newsize;
1003
1004 if (dp->i_df.if_format != XFS_DINODE_FMT_LOCAL)
1005 return false;
1006
1007 newsize = dp->i_df.if_bytes + (sfp->count + 1) * XFS_INO64_DIFF;
1008
1009 return inum > XFS_DIR2_MAX_SHORT_INUM &&
1010 sfp->i8count == 0 && newsize > xfs_inode_data_fork_size(dp);
1011}
1012
1013/*
1014 * Replace the inode number of an entry in a shortform directory.
1015 */
1016int /* error */
1017xfs_dir2_sf_replace(
1018 xfs_da_args_t *args) /* operation arguments */
1019{
1020 struct xfs_inode *dp = args->dp;
1021 struct xfs_mount *mp = dp->i_mount;
1022 struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;
1023 int i; /* entry index */
1024 xfs_ino_t ino=0; /* entry old inode number */
1025 int i8elevated; /* sf_toino8 set i8count=1 */
1026 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
1027
1028 trace_xfs_dir2_sf_replace(args);
1029
1030 ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL);
1031 ASSERT(dp->i_disk_size >= offsetof(struct xfs_dir2_sf_hdr, parent));
1032 ASSERT(dp->i_df.if_bytes == dp->i_disk_size);
1033 ASSERT(sfp != NULL);
1034 ASSERT(dp->i_disk_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
1035
1036 /*
1037 * New inode number is large, and need to convert to 8-byte inodes.
1038 */
1039 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
1040 int error; /* error return value */
1041
1042 /*
1043 * Won't fit as shortform, convert to block then do replace.
1044 */
1045 if (xfs_dir2_sf_replace_needblock(dp, args->inumber)) {
1046 error = xfs_dir2_sf_to_block(args);
1047 if (error)
1048 return error;
1049 return xfs_dir2_block_replace(args);
1050 }
1051 /*
1052 * Still fits, convert to 8-byte now.
1053 */
1054 xfs_dir2_sf_toino8(args);
1055 i8elevated = 1;
1056 sfp = dp->i_df.if_data;
1057 } else
1058 i8elevated = 0;
1059
1060 ASSERT(args->namelen != 1 || args->name[0] != '.');
1061 /*
1062 * Replace ..'s entry.
1063 */
1064 if (args->namelen == 2 &&
1065 args->name[0] == '.' && args->name[1] == '.') {
1066 ino = xfs_dir2_sf_get_parent_ino(sfp);
1067 ASSERT(args->inumber != ino);
1068 xfs_dir2_sf_put_parent_ino(sfp, args->inumber);
1069 }
1070 /*
1071 * Normal entry, look for the name.
1072 */
1073 else {
1074 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
1075 i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep)) {
1076 if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
1077 XFS_CMP_EXACT) {
1078 ino = xfs_dir2_sf_get_ino(mp, sfp, sfep);
1079 ASSERT(args->inumber != ino);
1080 xfs_dir2_sf_put_ino(mp, sfp, sfep,
1081 args->inumber);
1082 xfs_dir2_sf_put_ftype(mp, sfep, args->filetype);
1083 break;
1084 }
1085 }
1086 /*
1087 * Didn't find it.
1088 */
1089 if (i == sfp->count) {
1090 ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
1091 if (i8elevated)
1092 xfs_dir2_sf_toino4(args);
1093 return -ENOENT;
1094 }
1095 }
1096 /*
1097 * See if the old number was large, the new number is small.
1098 */
1099 if (ino > XFS_DIR2_MAX_SHORT_INUM &&
1100 args->inumber <= XFS_DIR2_MAX_SHORT_INUM) {
1101 /*
1102 * And the old count was one, so need to convert to small.
1103 */
1104 if (sfp->i8count == 1)
1105 xfs_dir2_sf_toino4(args);
1106 else
1107 sfp->i8count--;
1108 }
1109 /*
1110 * See if the old number was small, the new number is large.
1111 */
1112 if (ino <= XFS_DIR2_MAX_SHORT_INUM &&
1113 args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
1114 /*
1115 * add to the i8count unless we just converted to 8-byte
1116 * inodes (which does an implied i8count = 1)
1117 */
1118 ASSERT(sfp->i8count != 0);
1119 if (!i8elevated)
1120 sfp->i8count++;
1121 }
1122 xfs_dir2_sf_check(args);
1123 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
1124 return 0;
1125}
1126
1127/*
1128 * Convert from 8-byte inode numbers to 4-byte inode numbers.
1129 * The last 8-byte inode number is gone, but the count is still 1.
1130 */
1131static void
1132xfs_dir2_sf_toino4(
1133 xfs_da_args_t *args) /* operation arguments */
1134{
1135 struct xfs_inode *dp = args->dp;
1136 struct xfs_mount *mp = dp->i_mount;
1137 struct xfs_dir2_sf_hdr *oldsfp = dp->i_df.if_data;
1138 char *buf; /* old dir's buffer */
1139 int i; /* entry index */
1140 int newsize; /* new inode size */
1141 xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */
1142 int oldsize; /* old inode size */
1143 xfs_dir2_sf_entry_t *sfep; /* new sf entry */
1144 xfs_dir2_sf_hdr_t *sfp; /* new sf directory */
1145
1146 trace_xfs_dir2_sf_toino4(args);
1147
1148 /*
1149 * Copy the old directory to the buffer.
1150 * Then nuke it from the inode, and add the new buffer to the inode.
1151 * Don't want xfs_idata_realloc copying the data here.
1152 */
1153 oldsize = dp->i_df.if_bytes;
1154 buf = kmem_alloc(oldsize, 0);
1155 ASSERT(oldsfp->i8count == 1);
1156 memcpy(buf, oldsfp, oldsize);
1157 /*
1158 * Compute the new inode size.
1159 */
1160 newsize = oldsize - (oldsfp->count + 1) * XFS_INO64_DIFF;
1161 xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1162 xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1163 /*
1164 * Reset our pointers, the data has moved.
1165 */
1166 oldsfp = (xfs_dir2_sf_hdr_t *)buf;
1167 sfp = dp->i_df.if_data;
1168 /*
1169 * Fill in the new header.
1170 */
1171 sfp->count = oldsfp->count;
1172 sfp->i8count = 0;
1173 xfs_dir2_sf_put_parent_ino(sfp, xfs_dir2_sf_get_parent_ino(oldsfp));
1174 /*
1175 * Copy the entries field by field.
1176 */
1177 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1178 oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1179 i < sfp->count;
1180 i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep),
1181 oldsfep = xfs_dir2_sf_nextentry(mp, oldsfp, oldsfep)) {
1182 sfep->namelen = oldsfep->namelen;
1183 memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
1184 memcpy(sfep->name, oldsfep->name, sfep->namelen);
1185 xfs_dir2_sf_put_ino(mp, sfp, sfep,
1186 xfs_dir2_sf_get_ino(mp, oldsfp, oldsfep));
1187 xfs_dir2_sf_put_ftype(mp, sfep,
1188 xfs_dir2_sf_get_ftype(mp, oldsfep));
1189 }
1190 /*
1191 * Clean up the inode.
1192 */
1193 kmem_free(buf);
1194 dp->i_disk_size = newsize;
1195 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1196}
1197
1198/*
1199 * Convert existing entries from 4-byte inode numbers to 8-byte inode numbers.
1200 * The new entry w/ an 8-byte inode number is not there yet; we leave with
1201 * i8count set to 1, but no corresponding 8-byte entry.
1202 */
1203static void
1204xfs_dir2_sf_toino8(
1205 xfs_da_args_t *args) /* operation arguments */
1206{
1207 struct xfs_inode *dp = args->dp;
1208 struct xfs_mount *mp = dp->i_mount;
1209 struct xfs_dir2_sf_hdr *oldsfp = dp->i_df.if_data;
1210 char *buf; /* old dir's buffer */
1211 int i; /* entry index */
1212 int newsize; /* new inode size */
1213 xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */
1214 int oldsize; /* old inode size */
1215 xfs_dir2_sf_entry_t *sfep; /* new sf entry */
1216 xfs_dir2_sf_hdr_t *sfp; /* new sf directory */
1217
1218 trace_xfs_dir2_sf_toino8(args);
1219
1220 /*
1221 * Copy the old directory to the buffer.
1222 * Then nuke it from the inode, and add the new buffer to the inode.
1223 * Don't want xfs_idata_realloc copying the data here.
1224 */
1225 oldsize = dp->i_df.if_bytes;
1226 buf = kmem_alloc(oldsize, 0);
1227 ASSERT(oldsfp->i8count == 0);
1228 memcpy(buf, oldsfp, oldsize);
1229 /*
1230 * Compute the new inode size (nb: entry count + 1 for parent)
1231 */
1232 newsize = oldsize + (oldsfp->count + 1) * XFS_INO64_DIFF;
1233 xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1234 xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1235 /*
1236 * Reset our pointers, the data has moved.
1237 */
1238 oldsfp = (xfs_dir2_sf_hdr_t *)buf;
1239 sfp = dp->i_df.if_data;
1240 /*
1241 * Fill in the new header.
1242 */
1243 sfp->count = oldsfp->count;
1244 sfp->i8count = 1;
1245 xfs_dir2_sf_put_parent_ino(sfp, xfs_dir2_sf_get_parent_ino(oldsfp));
1246 /*
1247 * Copy the entries field by field.
1248 */
1249 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1250 oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1251 i < sfp->count;
1252 i++, sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep),
1253 oldsfep = xfs_dir2_sf_nextentry(mp, oldsfp, oldsfep)) {
1254 sfep->namelen = oldsfep->namelen;
1255 memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
1256 memcpy(sfep->name, oldsfep->name, sfep->namelen);
1257 xfs_dir2_sf_put_ino(mp, sfp, sfep,
1258 xfs_dir2_sf_get_ino(mp, oldsfp, oldsfep));
1259 xfs_dir2_sf_put_ftype(mp, sfep,
1260 xfs_dir2_sf_get_ftype(mp, oldsfep));
1261 }
1262 /*
1263 * Clean up the inode.
1264 */
1265 kmem_free(buf);
1266 dp->i_disk_size = newsize;
1267 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1268}
1/*
2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
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
7 * published by the Free Software Foundation.
8 *
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.
13 *
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
17 */
18#include "xfs.h"
19#include "xfs_fs.h"
20#include "xfs_format.h"
21#include "xfs_log_format.h"
22#include "xfs_trans_resv.h"
23#include "xfs_mount.h"
24#include "xfs_da_format.h"
25#include "xfs_da_btree.h"
26#include "xfs_inode.h"
27#include "xfs_trans.h"
28#include "xfs_inode_item.h"
29#include "xfs_error.h"
30#include "xfs_dir2.h"
31#include "xfs_dir2_priv.h"
32#include "xfs_trace.h"
33
34/*
35 * Prototypes for internal functions.
36 */
37static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args,
38 xfs_dir2_sf_entry_t *sfep,
39 xfs_dir2_data_aoff_t offset,
40 int new_isize);
41static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange,
42 int new_isize);
43static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange,
44 xfs_dir2_sf_entry_t **sfepp,
45 xfs_dir2_data_aoff_t *offsetp);
46#ifdef DEBUG
47static void xfs_dir2_sf_check(xfs_da_args_t *args);
48#else
49#define xfs_dir2_sf_check(args)
50#endif /* DEBUG */
51
52static void xfs_dir2_sf_toino4(xfs_da_args_t *args);
53static void xfs_dir2_sf_toino8(xfs_da_args_t *args);
54
55/*
56 * Given a block directory (dp/block), calculate its size as a shortform (sf)
57 * directory and a header for the sf directory, if it will fit it the
58 * space currently present in the inode. If it won't fit, the output
59 * size is too big (but not accurate).
60 */
61int /* size for sf form */
62xfs_dir2_block_sfsize(
63 xfs_inode_t *dp, /* incore inode pointer */
64 xfs_dir2_data_hdr_t *hdr, /* block directory data */
65 xfs_dir2_sf_hdr_t *sfhp) /* output: header for sf form */
66{
67 xfs_dir2_dataptr_t addr; /* data entry address */
68 xfs_dir2_leaf_entry_t *blp; /* leaf area of the block */
69 xfs_dir2_block_tail_t *btp; /* tail area of the block */
70 int count; /* shortform entry count */
71 xfs_dir2_data_entry_t *dep; /* data entry in the block */
72 int i; /* block entry index */
73 int i8count; /* count of big-inode entries */
74 int isdot; /* entry is "." */
75 int isdotdot; /* entry is ".." */
76 xfs_mount_t *mp; /* mount structure pointer */
77 int namelen; /* total name bytes */
78 xfs_ino_t parent = 0; /* parent inode number */
79 int size=0; /* total computed size */
80 int has_ftype;
81 struct xfs_da_geometry *geo;
82
83 mp = dp->i_mount;
84 geo = mp->m_dir_geo;
85
86 /*
87 * if there is a filetype field, add the extra byte to the namelen
88 * for each entry that we see.
89 */
90 has_ftype = xfs_sb_version_hasftype(&mp->m_sb) ? 1 : 0;
91
92 count = i8count = namelen = 0;
93 btp = xfs_dir2_block_tail_p(geo, hdr);
94 blp = xfs_dir2_block_leaf_p(btp);
95
96 /*
97 * Iterate over the block's data entries by using the leaf pointers.
98 */
99 for (i = 0; i < be32_to_cpu(btp->count); i++) {
100 if ((addr = be32_to_cpu(blp[i].address)) == XFS_DIR2_NULL_DATAPTR)
101 continue;
102 /*
103 * Calculate the pointer to the entry at hand.
104 */
105 dep = (xfs_dir2_data_entry_t *)((char *)hdr +
106 xfs_dir2_dataptr_to_off(geo, addr));
107 /*
108 * Detect . and .., so we can special-case them.
109 * . is not included in sf directories.
110 * .. is included by just the parent inode number.
111 */
112 isdot = dep->namelen == 1 && dep->name[0] == '.';
113 isdotdot =
114 dep->namelen == 2 &&
115 dep->name[0] == '.' && dep->name[1] == '.';
116
117 if (!isdot)
118 i8count += be64_to_cpu(dep->inumber) > XFS_DIR2_MAX_SHORT_INUM;
119
120 /* take into account the file type field */
121 if (!isdot && !isdotdot) {
122 count++;
123 namelen += dep->namelen + has_ftype;
124 } else if (isdotdot)
125 parent = be64_to_cpu(dep->inumber);
126 /*
127 * Calculate the new size, see if we should give up yet.
128 */
129 size = xfs_dir2_sf_hdr_size(i8count) + /* header */
130 count * 3 * sizeof(u8) + /* namelen + offset */
131 namelen + /* name */
132 (i8count ? /* inumber */
133 count * XFS_INO64_SIZE :
134 count * XFS_INO32_SIZE);
135 if (size > XFS_IFORK_DSIZE(dp))
136 return size; /* size value is a failure */
137 }
138 /*
139 * Create the output header, if it worked.
140 */
141 sfhp->count = count;
142 sfhp->i8count = i8count;
143 dp->d_ops->sf_put_parent_ino(sfhp, parent);
144 return size;
145}
146
147/*
148 * Convert a block format directory to shortform.
149 * Caller has already checked that it will fit, and built us a header.
150 */
151int /* error */
152xfs_dir2_block_to_sf(
153 xfs_da_args_t *args, /* operation arguments */
154 struct xfs_buf *bp,
155 int size, /* shortform directory size */
156 xfs_dir2_sf_hdr_t *sfhp) /* shortform directory hdr */
157{
158 xfs_dir2_data_hdr_t *hdr; /* block header */
159 xfs_dir2_block_tail_t *btp; /* block tail pointer */
160 xfs_dir2_data_entry_t *dep; /* data entry pointer */
161 xfs_inode_t *dp; /* incore directory inode */
162 xfs_dir2_data_unused_t *dup; /* unused data pointer */
163 char *endptr; /* end of data entries */
164 int error; /* error return value */
165 int logflags; /* inode logging flags */
166 xfs_mount_t *mp; /* filesystem mount point */
167 char *ptr; /* current data pointer */
168 xfs_dir2_sf_entry_t *sfep; /* shortform entry */
169 xfs_dir2_sf_hdr_t *sfp; /* shortform directory header */
170 xfs_dir2_sf_hdr_t *dst; /* temporary data buffer */
171
172 trace_xfs_dir2_block_to_sf(args);
173
174 dp = args->dp;
175 mp = dp->i_mount;
176
177 /*
178 * allocate a temporary destination buffer the size of the inode
179 * to format the data into. Once we have formatted the data, we
180 * can free the block and copy the formatted data into the inode literal
181 * area.
182 */
183 dst = kmem_alloc(mp->m_sb.sb_inodesize, KM_SLEEP);
184 hdr = bp->b_addr;
185
186 /*
187 * Copy the header into the newly allocate local space.
188 */
189 sfp = (xfs_dir2_sf_hdr_t *)dst;
190 memcpy(sfp, sfhp, xfs_dir2_sf_hdr_size(sfhp->i8count));
191
192 /*
193 * Set up to loop over the block's entries.
194 */
195 btp = xfs_dir2_block_tail_p(args->geo, hdr);
196 ptr = (char *)dp->d_ops->data_entry_p(hdr);
197 endptr = (char *)xfs_dir2_block_leaf_p(btp);
198 sfep = xfs_dir2_sf_firstentry(sfp);
199 /*
200 * Loop over the active and unused entries.
201 * Stop when we reach the leaf/tail portion of the block.
202 */
203 while (ptr < endptr) {
204 /*
205 * If it's unused, just skip over it.
206 */
207 dup = (xfs_dir2_data_unused_t *)ptr;
208 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
209 ptr += be16_to_cpu(dup->length);
210 continue;
211 }
212 dep = (xfs_dir2_data_entry_t *)ptr;
213 /*
214 * Skip .
215 */
216 if (dep->namelen == 1 && dep->name[0] == '.')
217 ASSERT(be64_to_cpu(dep->inumber) == dp->i_ino);
218 /*
219 * Skip .., but make sure the inode number is right.
220 */
221 else if (dep->namelen == 2 &&
222 dep->name[0] == '.' && dep->name[1] == '.')
223 ASSERT(be64_to_cpu(dep->inumber) ==
224 dp->d_ops->sf_get_parent_ino(sfp));
225 /*
226 * Normal entry, copy it into shortform.
227 */
228 else {
229 sfep->namelen = dep->namelen;
230 xfs_dir2_sf_put_offset(sfep,
231 (xfs_dir2_data_aoff_t)
232 ((char *)dep - (char *)hdr));
233 memcpy(sfep->name, dep->name, dep->namelen);
234 dp->d_ops->sf_put_ino(sfp, sfep,
235 be64_to_cpu(dep->inumber));
236 dp->d_ops->sf_put_ftype(sfep,
237 dp->d_ops->data_get_ftype(dep));
238
239 sfep = dp->d_ops->sf_nextentry(sfp, sfep);
240 }
241 ptr += dp->d_ops->data_entsize(dep->namelen);
242 }
243 ASSERT((char *)sfep - (char *)sfp == size);
244
245 /* now we are done with the block, we can shrink the inode */
246 logflags = XFS_ILOG_CORE;
247 error = xfs_dir2_shrink_inode(args, args->geo->datablk, bp);
248 if (error) {
249 ASSERT(error != -ENOSPC);
250 goto out;
251 }
252
253 /*
254 * The buffer is now unconditionally gone, whether
255 * xfs_dir2_shrink_inode worked or not.
256 *
257 * Convert the inode to local format and copy the data in.
258 */
259 ASSERT(dp->i_df.if_bytes == 0);
260 xfs_init_local_fork(dp, XFS_DATA_FORK, dst, size);
261 dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
262 dp->i_d.di_size = size;
263
264 logflags |= XFS_ILOG_DDATA;
265 xfs_dir2_sf_check(args);
266out:
267 xfs_trans_log_inode(args->trans, dp, logflags);
268 kmem_free(dst);
269 return error;
270}
271
272/*
273 * Add a name to a shortform directory.
274 * There are two algorithms, "easy" and "hard" which we decide on
275 * before changing anything.
276 * Convert to block form if necessary, if the new entry won't fit.
277 */
278int /* error */
279xfs_dir2_sf_addname(
280 xfs_da_args_t *args) /* operation arguments */
281{
282 xfs_inode_t *dp; /* incore directory inode */
283 int error; /* error return value */
284 int incr_isize; /* total change in size */
285 int new_isize; /* di_size after adding name */
286 int objchange; /* changing to 8-byte inodes */
287 xfs_dir2_data_aoff_t offset = 0; /* offset for new entry */
288 int pick; /* which algorithm to use */
289 xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
290 xfs_dir2_sf_entry_t *sfep = NULL; /* shortform entry */
291
292 trace_xfs_dir2_sf_addname(args);
293
294 ASSERT(xfs_dir2_sf_lookup(args) == -ENOENT);
295 dp = args->dp;
296 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
297 /*
298 * Make sure the shortform value has some of its header.
299 */
300 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
301 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
302 return -EIO;
303 }
304 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
305 ASSERT(dp->i_df.if_u1.if_data != NULL);
306 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
307 ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
308 /*
309 * Compute entry (and change in) size.
310 */
311 incr_isize = dp->d_ops->sf_entsize(sfp, args->namelen);
312 objchange = 0;
313
314 /*
315 * Do we have to change to 8 byte inodes?
316 */
317 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
318 /*
319 * Yes, adjust the inode size. old count + (parent + new)
320 */
321 incr_isize += (sfp->count + 2) * XFS_INO64_DIFF;
322 objchange = 1;
323 }
324
325 new_isize = (int)dp->i_d.di_size + incr_isize;
326 /*
327 * Won't fit as shortform any more (due to size),
328 * or the pick routine says it won't (due to offset values).
329 */
330 if (new_isize > XFS_IFORK_DSIZE(dp) ||
331 (pick =
332 xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) {
333 /*
334 * Just checking or no space reservation, it doesn't fit.
335 */
336 if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0)
337 return -ENOSPC;
338 /*
339 * Convert to block form then add the name.
340 */
341 error = xfs_dir2_sf_to_block(args);
342 if (error)
343 return error;
344 return xfs_dir2_block_addname(args);
345 }
346 /*
347 * Just checking, it fits.
348 */
349 if (args->op_flags & XFS_DA_OP_JUSTCHECK)
350 return 0;
351 /*
352 * Do it the easy way - just add it at the end.
353 */
354 if (pick == 1)
355 xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize);
356 /*
357 * Do it the hard way - look for a place to insert the new entry.
358 * Convert to 8 byte inode numbers first if necessary.
359 */
360 else {
361 ASSERT(pick == 2);
362 if (objchange)
363 xfs_dir2_sf_toino8(args);
364 xfs_dir2_sf_addname_hard(args, objchange, new_isize);
365 }
366 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
367 return 0;
368}
369
370/*
371 * Add the new entry the "easy" way.
372 * This is copying the old directory and adding the new entry at the end.
373 * Since it's sorted by "offset" we need room after the last offset
374 * that's already there, and then room to convert to a block directory.
375 * This is already checked by the pick routine.
376 */
377static void
378xfs_dir2_sf_addname_easy(
379 xfs_da_args_t *args, /* operation arguments */
380 xfs_dir2_sf_entry_t *sfep, /* pointer to new entry */
381 xfs_dir2_data_aoff_t offset, /* offset to use for new ent */
382 int new_isize) /* new directory size */
383{
384 int byteoff; /* byte offset in sf dir */
385 xfs_inode_t *dp; /* incore directory inode */
386 xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
387
388 dp = args->dp;
389
390 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
391 byteoff = (int)((char *)sfep - (char *)sfp);
392 /*
393 * Grow the in-inode space.
394 */
395 xfs_idata_realloc(dp, dp->d_ops->sf_entsize(sfp, args->namelen),
396 XFS_DATA_FORK);
397 /*
398 * Need to set up again due to realloc of the inode data.
399 */
400 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
401 sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + byteoff);
402 /*
403 * Fill in the new entry.
404 */
405 sfep->namelen = args->namelen;
406 xfs_dir2_sf_put_offset(sfep, offset);
407 memcpy(sfep->name, args->name, sfep->namelen);
408 dp->d_ops->sf_put_ino(sfp, sfep, args->inumber);
409 dp->d_ops->sf_put_ftype(sfep, args->filetype);
410
411 /*
412 * Update the header and inode.
413 */
414 sfp->count++;
415 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM)
416 sfp->i8count++;
417 dp->i_d.di_size = new_isize;
418 xfs_dir2_sf_check(args);
419}
420
421/*
422 * Add the new entry the "hard" way.
423 * The caller has already converted to 8 byte inode numbers if necessary,
424 * in which case we need to leave the i8count at 1.
425 * Find a hole that the new entry will fit into, and copy
426 * the first part of the entries, the new entry, and the last part of
427 * the entries.
428 */
429/* ARGSUSED */
430static void
431xfs_dir2_sf_addname_hard(
432 xfs_da_args_t *args, /* operation arguments */
433 int objchange, /* changing inode number size */
434 int new_isize) /* new directory size */
435{
436 int add_datasize; /* data size need for new ent */
437 char *buf; /* buffer for old */
438 xfs_inode_t *dp; /* incore directory inode */
439 int eof; /* reached end of old dir */
440 int nbytes; /* temp for byte copies */
441 xfs_dir2_data_aoff_t new_offset; /* next offset value */
442 xfs_dir2_data_aoff_t offset; /* current offset value */
443 int old_isize; /* previous di_size */
444 xfs_dir2_sf_entry_t *oldsfep; /* entry in original dir */
445 xfs_dir2_sf_hdr_t *oldsfp; /* original shortform dir */
446 xfs_dir2_sf_entry_t *sfep; /* entry in new dir */
447 xfs_dir2_sf_hdr_t *sfp; /* new shortform dir */
448
449 /*
450 * Copy the old directory to the stack buffer.
451 */
452 dp = args->dp;
453
454 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
455 old_isize = (int)dp->i_d.di_size;
456 buf = kmem_alloc(old_isize, KM_SLEEP);
457 oldsfp = (xfs_dir2_sf_hdr_t *)buf;
458 memcpy(oldsfp, sfp, old_isize);
459 /*
460 * Loop over the old directory finding the place we're going
461 * to insert the new entry.
462 * If it's going to end up at the end then oldsfep will point there.
463 */
464 for (offset = dp->d_ops->data_first_offset,
465 oldsfep = xfs_dir2_sf_firstentry(oldsfp),
466 add_datasize = dp->d_ops->data_entsize(args->namelen),
467 eof = (char *)oldsfep == &buf[old_isize];
468 !eof;
469 offset = new_offset + dp->d_ops->data_entsize(oldsfep->namelen),
470 oldsfep = dp->d_ops->sf_nextentry(oldsfp, oldsfep),
471 eof = (char *)oldsfep == &buf[old_isize]) {
472 new_offset = xfs_dir2_sf_get_offset(oldsfep);
473 if (offset + add_datasize <= new_offset)
474 break;
475 }
476 /*
477 * Get rid of the old directory, then allocate space for
478 * the new one. We do this so xfs_idata_realloc won't copy
479 * the data.
480 */
481 xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK);
482 xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK);
483 /*
484 * Reset the pointer since the buffer was reallocated.
485 */
486 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
487 /*
488 * Copy the first part of the directory, including the header.
489 */
490 nbytes = (int)((char *)oldsfep - (char *)oldsfp);
491 memcpy(sfp, oldsfp, nbytes);
492 sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes);
493 /*
494 * Fill in the new entry, and update the header counts.
495 */
496 sfep->namelen = args->namelen;
497 xfs_dir2_sf_put_offset(sfep, offset);
498 memcpy(sfep->name, args->name, sfep->namelen);
499 dp->d_ops->sf_put_ino(sfp, sfep, args->inumber);
500 dp->d_ops->sf_put_ftype(sfep, args->filetype);
501 sfp->count++;
502 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange)
503 sfp->i8count++;
504 /*
505 * If there's more left to copy, do that.
506 */
507 if (!eof) {
508 sfep = dp->d_ops->sf_nextentry(sfp, sfep);
509 memcpy(sfep, oldsfep, old_isize - nbytes);
510 }
511 kmem_free(buf);
512 dp->i_d.di_size = new_isize;
513 xfs_dir2_sf_check(args);
514}
515
516/*
517 * Decide if the new entry will fit at all.
518 * If it will fit, pick between adding the new entry to the end (easy)
519 * or somewhere else (hard).
520 * Return 0 (won't fit), 1 (easy), 2 (hard).
521 */
522/*ARGSUSED*/
523static int /* pick result */
524xfs_dir2_sf_addname_pick(
525 xfs_da_args_t *args, /* operation arguments */
526 int objchange, /* inode # size changes */
527 xfs_dir2_sf_entry_t **sfepp, /* out(1): new entry ptr */
528 xfs_dir2_data_aoff_t *offsetp) /* out(1): new offset */
529{
530 xfs_inode_t *dp; /* incore directory inode */
531 int holefit; /* found hole it will fit in */
532 int i; /* entry number */
533 xfs_dir2_data_aoff_t offset; /* data block offset */
534 xfs_dir2_sf_entry_t *sfep; /* shortform entry */
535 xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
536 int size; /* entry's data size */
537 int used; /* data bytes used */
538
539 dp = args->dp;
540
541 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
542 size = dp->d_ops->data_entsize(args->namelen);
543 offset = dp->d_ops->data_first_offset;
544 sfep = xfs_dir2_sf_firstentry(sfp);
545 holefit = 0;
546 /*
547 * Loop over sf entries.
548 * Keep track of data offset and whether we've seen a place
549 * to insert the new entry.
550 */
551 for (i = 0; i < sfp->count; i++) {
552 if (!holefit)
553 holefit = offset + size <= xfs_dir2_sf_get_offset(sfep);
554 offset = xfs_dir2_sf_get_offset(sfep) +
555 dp->d_ops->data_entsize(sfep->namelen);
556 sfep = dp->d_ops->sf_nextentry(sfp, sfep);
557 }
558 /*
559 * Calculate data bytes used excluding the new entry, if this
560 * was a data block (block form directory).
561 */
562 used = offset +
563 (sfp->count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
564 (uint)sizeof(xfs_dir2_block_tail_t);
565 /*
566 * If it won't fit in a block form then we can't insert it,
567 * we'll go back, convert to block, then try the insert and convert
568 * to leaf.
569 */
570 if (used + (holefit ? 0 : size) > args->geo->blksize)
571 return 0;
572 /*
573 * If changing the inode number size, do it the hard way.
574 */
575 if (objchange)
576 return 2;
577 /*
578 * If it won't fit at the end then do it the hard way (use the hole).
579 */
580 if (used + size > args->geo->blksize)
581 return 2;
582 /*
583 * Do it the easy way.
584 */
585 *sfepp = sfep;
586 *offsetp = offset;
587 return 1;
588}
589
590#ifdef DEBUG
591/*
592 * Check consistency of shortform directory, assert if bad.
593 */
594static void
595xfs_dir2_sf_check(
596 xfs_da_args_t *args) /* operation arguments */
597{
598 xfs_inode_t *dp; /* incore directory inode */
599 int i; /* entry number */
600 int i8count; /* number of big inode#s */
601 xfs_ino_t ino; /* entry inode number */
602 int offset; /* data offset */
603 xfs_dir2_sf_entry_t *sfep; /* shortform dir entry */
604 xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
605
606 dp = args->dp;
607
608 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
609 offset = dp->d_ops->data_first_offset;
610 ino = dp->d_ops->sf_get_parent_ino(sfp);
611 i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
612
613 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
614 i < sfp->count;
615 i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
616 ASSERT(xfs_dir2_sf_get_offset(sfep) >= offset);
617 ino = dp->d_ops->sf_get_ino(sfp, sfep);
618 i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
619 offset =
620 xfs_dir2_sf_get_offset(sfep) +
621 dp->d_ops->data_entsize(sfep->namelen);
622 ASSERT(dp->d_ops->sf_get_ftype(sfep) < XFS_DIR3_FT_MAX);
623 }
624 ASSERT(i8count == sfp->i8count);
625 ASSERT((char *)sfep - (char *)sfp == dp->i_d.di_size);
626 ASSERT(offset +
627 (sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
628 (uint)sizeof(xfs_dir2_block_tail_t) <= args->geo->blksize);
629}
630#endif /* DEBUG */
631
632/*
633 * Create a new (shortform) directory.
634 */
635int /* error, always 0 */
636xfs_dir2_sf_create(
637 xfs_da_args_t *args, /* operation arguments */
638 xfs_ino_t pino) /* parent inode number */
639{
640 xfs_inode_t *dp; /* incore directory inode */
641 int i8count; /* parent inode is an 8-byte number */
642 xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
643 int size; /* directory size */
644
645 trace_xfs_dir2_sf_create(args);
646
647 dp = args->dp;
648
649 ASSERT(dp != NULL);
650 ASSERT(dp->i_d.di_size == 0);
651 /*
652 * If it's currently a zero-length extent file,
653 * convert it to local format.
654 */
655 if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) {
656 dp->i_df.if_flags &= ~XFS_IFEXTENTS; /* just in case */
657 dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
658 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
659 dp->i_df.if_flags |= XFS_IFINLINE;
660 }
661 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
662 ASSERT(dp->i_df.if_bytes == 0);
663 i8count = pino > XFS_DIR2_MAX_SHORT_INUM;
664 size = xfs_dir2_sf_hdr_size(i8count);
665 /*
666 * Make a buffer for the data.
667 */
668 xfs_idata_realloc(dp, size, XFS_DATA_FORK);
669 /*
670 * Fill in the header,
671 */
672 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
673 sfp->i8count = i8count;
674 /*
675 * Now can put in the inode number, since i8count is set.
676 */
677 dp->d_ops->sf_put_parent_ino(sfp, pino);
678 sfp->count = 0;
679 dp->i_d.di_size = size;
680 xfs_dir2_sf_check(args);
681 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
682 return 0;
683}
684
685/*
686 * Lookup an entry in a shortform directory.
687 * Returns EEXIST if found, ENOENT if not found.
688 */
689int /* error */
690xfs_dir2_sf_lookup(
691 xfs_da_args_t *args) /* operation arguments */
692{
693 xfs_inode_t *dp; /* incore directory inode */
694 int i; /* entry index */
695 int error;
696 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
697 xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
698 enum xfs_dacmp cmp; /* comparison result */
699 xfs_dir2_sf_entry_t *ci_sfep; /* case-insens. entry */
700
701 trace_xfs_dir2_sf_lookup(args);
702
703 xfs_dir2_sf_check(args);
704 dp = args->dp;
705
706 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
707 /*
708 * Bail out if the directory is way too short.
709 */
710 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
711 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
712 return -EIO;
713 }
714 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
715 ASSERT(dp->i_df.if_u1.if_data != NULL);
716 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
717 ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
718 /*
719 * Special case for .
720 */
721 if (args->namelen == 1 && args->name[0] == '.') {
722 args->inumber = dp->i_ino;
723 args->cmpresult = XFS_CMP_EXACT;
724 args->filetype = XFS_DIR3_FT_DIR;
725 return -EEXIST;
726 }
727 /*
728 * Special case for ..
729 */
730 if (args->namelen == 2 &&
731 args->name[0] == '.' && args->name[1] == '.') {
732 args->inumber = dp->d_ops->sf_get_parent_ino(sfp);
733 args->cmpresult = XFS_CMP_EXACT;
734 args->filetype = XFS_DIR3_FT_DIR;
735 return -EEXIST;
736 }
737 /*
738 * Loop over all the entries trying to match ours.
739 */
740 ci_sfep = NULL;
741 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
742 i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
743 /*
744 * Compare name and if it's an exact match, return the inode
745 * number. If it's the first case-insensitive match, store the
746 * inode number and continue looking for an exact match.
747 */
748 cmp = dp->i_mount->m_dirnameops->compname(args, sfep->name,
749 sfep->namelen);
750 if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
751 args->cmpresult = cmp;
752 args->inumber = dp->d_ops->sf_get_ino(sfp, sfep);
753 args->filetype = dp->d_ops->sf_get_ftype(sfep);
754 if (cmp == XFS_CMP_EXACT)
755 return -EEXIST;
756 ci_sfep = sfep;
757 }
758 }
759 ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
760 /*
761 * Here, we can only be doing a lookup (not a rename or replace).
762 * If a case-insensitive match was not found, return -ENOENT.
763 */
764 if (!ci_sfep)
765 return -ENOENT;
766 /* otherwise process the CI match as required by the caller */
767 error = xfs_dir_cilookup_result(args, ci_sfep->name, ci_sfep->namelen);
768 return error;
769}
770
771/*
772 * Remove an entry from a shortform directory.
773 */
774int /* error */
775xfs_dir2_sf_removename(
776 xfs_da_args_t *args)
777{
778 int byteoff; /* offset of removed entry */
779 xfs_inode_t *dp; /* incore directory inode */
780 int entsize; /* this entry's size */
781 int i; /* shortform entry index */
782 int newsize; /* new inode size */
783 int oldsize; /* old inode size */
784 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
785 xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
786
787 trace_xfs_dir2_sf_removename(args);
788
789 dp = args->dp;
790
791 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
792 oldsize = (int)dp->i_d.di_size;
793 /*
794 * Bail out if the directory is way too short.
795 */
796 if (oldsize < offsetof(xfs_dir2_sf_hdr_t, parent)) {
797 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
798 return -EIO;
799 }
800 ASSERT(dp->i_df.if_bytes == oldsize);
801 ASSERT(dp->i_df.if_u1.if_data != NULL);
802 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
803 ASSERT(oldsize >= xfs_dir2_sf_hdr_size(sfp->i8count));
804 /*
805 * Loop over the old directory entries.
806 * Find the one we're deleting.
807 */
808 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
809 i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
810 if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
811 XFS_CMP_EXACT) {
812 ASSERT(dp->d_ops->sf_get_ino(sfp, sfep) ==
813 args->inumber);
814 break;
815 }
816 }
817 /*
818 * Didn't find it.
819 */
820 if (i == sfp->count)
821 return -ENOENT;
822 /*
823 * Calculate sizes.
824 */
825 byteoff = (int)((char *)sfep - (char *)sfp);
826 entsize = dp->d_ops->sf_entsize(sfp, args->namelen);
827 newsize = oldsize - entsize;
828 /*
829 * Copy the part if any after the removed entry, sliding it down.
830 */
831 if (byteoff + entsize < oldsize)
832 memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize,
833 oldsize - (byteoff + entsize));
834 /*
835 * Fix up the header and file size.
836 */
837 sfp->count--;
838 dp->i_d.di_size = newsize;
839 /*
840 * Reallocate, making it smaller.
841 */
842 xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
843 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
844 /*
845 * Are we changing inode number size?
846 */
847 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
848 if (sfp->i8count == 1)
849 xfs_dir2_sf_toino4(args);
850 else
851 sfp->i8count--;
852 }
853 xfs_dir2_sf_check(args);
854 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
855 return 0;
856}
857
858/*
859 * Replace the inode number of an entry in a shortform directory.
860 */
861int /* error */
862xfs_dir2_sf_replace(
863 xfs_da_args_t *args) /* operation arguments */
864{
865 xfs_inode_t *dp; /* incore directory inode */
866 int i; /* entry index */
867 xfs_ino_t ino=0; /* entry old inode number */
868 int i8elevated; /* sf_toino8 set i8count=1 */
869 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
870 xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
871
872 trace_xfs_dir2_sf_replace(args);
873
874 dp = args->dp;
875
876 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
877 /*
878 * Bail out if the shortform directory is way too small.
879 */
880 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
881 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
882 return -EIO;
883 }
884 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
885 ASSERT(dp->i_df.if_u1.if_data != NULL);
886 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
887 ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
888
889 /*
890 * New inode number is large, and need to convert to 8-byte inodes.
891 */
892 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
893 int error; /* error return value */
894 int newsize; /* new inode size */
895
896 newsize = dp->i_df.if_bytes + (sfp->count + 1) * XFS_INO64_DIFF;
897 /*
898 * Won't fit as shortform, convert to block then do replace.
899 */
900 if (newsize > XFS_IFORK_DSIZE(dp)) {
901 error = xfs_dir2_sf_to_block(args);
902 if (error) {
903 return error;
904 }
905 return xfs_dir2_block_replace(args);
906 }
907 /*
908 * Still fits, convert to 8-byte now.
909 */
910 xfs_dir2_sf_toino8(args);
911 i8elevated = 1;
912 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
913 } else
914 i8elevated = 0;
915
916 ASSERT(args->namelen != 1 || args->name[0] != '.');
917 /*
918 * Replace ..'s entry.
919 */
920 if (args->namelen == 2 &&
921 args->name[0] == '.' && args->name[1] == '.') {
922 ino = dp->d_ops->sf_get_parent_ino(sfp);
923 ASSERT(args->inumber != ino);
924 dp->d_ops->sf_put_parent_ino(sfp, args->inumber);
925 }
926 /*
927 * Normal entry, look for the name.
928 */
929 else {
930 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
931 i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
932 if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
933 XFS_CMP_EXACT) {
934 ino = dp->d_ops->sf_get_ino(sfp, sfep);
935 ASSERT(args->inumber != ino);
936 dp->d_ops->sf_put_ino(sfp, sfep, args->inumber);
937 dp->d_ops->sf_put_ftype(sfep, args->filetype);
938 break;
939 }
940 }
941 /*
942 * Didn't find it.
943 */
944 if (i == sfp->count) {
945 ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
946 if (i8elevated)
947 xfs_dir2_sf_toino4(args);
948 return -ENOENT;
949 }
950 }
951 /*
952 * See if the old number was large, the new number is small.
953 */
954 if (ino > XFS_DIR2_MAX_SHORT_INUM &&
955 args->inumber <= XFS_DIR2_MAX_SHORT_INUM) {
956 /*
957 * And the old count was one, so need to convert to small.
958 */
959 if (sfp->i8count == 1)
960 xfs_dir2_sf_toino4(args);
961 else
962 sfp->i8count--;
963 }
964 /*
965 * See if the old number was small, the new number is large.
966 */
967 if (ino <= XFS_DIR2_MAX_SHORT_INUM &&
968 args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
969 /*
970 * add to the i8count unless we just converted to 8-byte
971 * inodes (which does an implied i8count = 1)
972 */
973 ASSERT(sfp->i8count != 0);
974 if (!i8elevated)
975 sfp->i8count++;
976 }
977 xfs_dir2_sf_check(args);
978 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
979 return 0;
980}
981
982/*
983 * Convert from 8-byte inode numbers to 4-byte inode numbers.
984 * The last 8-byte inode number is gone, but the count is still 1.
985 */
986static void
987xfs_dir2_sf_toino4(
988 xfs_da_args_t *args) /* operation arguments */
989{
990 char *buf; /* old dir's buffer */
991 xfs_inode_t *dp; /* incore directory inode */
992 int i; /* entry index */
993 int newsize; /* new inode size */
994 xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */
995 xfs_dir2_sf_hdr_t *oldsfp; /* old sf directory */
996 int oldsize; /* old inode size */
997 xfs_dir2_sf_entry_t *sfep; /* new sf entry */
998 xfs_dir2_sf_hdr_t *sfp; /* new sf directory */
999
1000 trace_xfs_dir2_sf_toino4(args);
1001
1002 dp = args->dp;
1003
1004 /*
1005 * Copy the old directory to the buffer.
1006 * Then nuke it from the inode, and add the new buffer to the inode.
1007 * Don't want xfs_idata_realloc copying the data here.
1008 */
1009 oldsize = dp->i_df.if_bytes;
1010 buf = kmem_alloc(oldsize, KM_SLEEP);
1011 oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1012 ASSERT(oldsfp->i8count == 1);
1013 memcpy(buf, oldsfp, oldsize);
1014 /*
1015 * Compute the new inode size.
1016 */
1017 newsize = oldsize - (oldsfp->count + 1) * XFS_INO64_DIFF;
1018 xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1019 xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1020 /*
1021 * Reset our pointers, the data has moved.
1022 */
1023 oldsfp = (xfs_dir2_sf_hdr_t *)buf;
1024 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1025 /*
1026 * Fill in the new header.
1027 */
1028 sfp->count = oldsfp->count;
1029 sfp->i8count = 0;
1030 dp->d_ops->sf_put_parent_ino(sfp, dp->d_ops->sf_get_parent_ino(oldsfp));
1031 /*
1032 * Copy the entries field by field.
1033 */
1034 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1035 oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1036 i < sfp->count;
1037 i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep),
1038 oldsfep = dp->d_ops->sf_nextentry(oldsfp, oldsfep)) {
1039 sfep->namelen = oldsfep->namelen;
1040 memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
1041 memcpy(sfep->name, oldsfep->name, sfep->namelen);
1042 dp->d_ops->sf_put_ino(sfp, sfep,
1043 dp->d_ops->sf_get_ino(oldsfp, oldsfep));
1044 dp->d_ops->sf_put_ftype(sfep, dp->d_ops->sf_get_ftype(oldsfep));
1045 }
1046 /*
1047 * Clean up the inode.
1048 */
1049 kmem_free(buf);
1050 dp->i_d.di_size = newsize;
1051 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1052}
1053
1054/*
1055 * Convert existing entries from 4-byte inode numbers to 8-byte inode numbers.
1056 * The new entry w/ an 8-byte inode number is not there yet; we leave with
1057 * i8count set to 1, but no corresponding 8-byte entry.
1058 */
1059static void
1060xfs_dir2_sf_toino8(
1061 xfs_da_args_t *args) /* operation arguments */
1062{
1063 char *buf; /* old dir's buffer */
1064 xfs_inode_t *dp; /* incore directory inode */
1065 int i; /* entry index */
1066 int newsize; /* new inode size */
1067 xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */
1068 xfs_dir2_sf_hdr_t *oldsfp; /* old sf directory */
1069 int oldsize; /* old inode size */
1070 xfs_dir2_sf_entry_t *sfep; /* new sf entry */
1071 xfs_dir2_sf_hdr_t *sfp; /* new sf directory */
1072
1073 trace_xfs_dir2_sf_toino8(args);
1074
1075 dp = args->dp;
1076
1077 /*
1078 * Copy the old directory to the buffer.
1079 * Then nuke it from the inode, and add the new buffer to the inode.
1080 * Don't want xfs_idata_realloc copying the data here.
1081 */
1082 oldsize = dp->i_df.if_bytes;
1083 buf = kmem_alloc(oldsize, KM_SLEEP);
1084 oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1085 ASSERT(oldsfp->i8count == 0);
1086 memcpy(buf, oldsfp, oldsize);
1087 /*
1088 * Compute the new inode size (nb: entry count + 1 for parent)
1089 */
1090 newsize = oldsize + (oldsfp->count + 1) * XFS_INO64_DIFF;
1091 xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1092 xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1093 /*
1094 * Reset our pointers, the data has moved.
1095 */
1096 oldsfp = (xfs_dir2_sf_hdr_t *)buf;
1097 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1098 /*
1099 * Fill in the new header.
1100 */
1101 sfp->count = oldsfp->count;
1102 sfp->i8count = 1;
1103 dp->d_ops->sf_put_parent_ino(sfp, dp->d_ops->sf_get_parent_ino(oldsfp));
1104 /*
1105 * Copy the entries field by field.
1106 */
1107 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1108 oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1109 i < sfp->count;
1110 i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep),
1111 oldsfep = dp->d_ops->sf_nextentry(oldsfp, oldsfep)) {
1112 sfep->namelen = oldsfep->namelen;
1113 memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
1114 memcpy(sfep->name, oldsfep->name, sfep->namelen);
1115 dp->d_ops->sf_put_ino(sfp, sfep,
1116 dp->d_ops->sf_get_ino(oldsfp, oldsfep));
1117 dp->d_ops->sf_put_ftype(sfep, dp->d_ops->sf_get_ftype(oldsfep));
1118 }
1119 /*
1120 * Clean up the inode.
1121 */
1122 kmem_free(buf);
1123 dp->i_d.di_size = newsize;
1124 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1125}