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, len: 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, dp: 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 = kmalloc(mp->m_sb.sb_inodesize, GFP_KERNEL | __GFP_NOFAIL);
280 memcpy(sfp, sfhp, xfs_dir2_sf_hdr_size(i8count: 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(geo: args->geo, hdr: bp->b_addr);
287 sfep = xfs_dir2_sf_firstentry(hdr: 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, off: 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, hdr: sfp, sfep);
325 }
326 offset += xfs_dir2_data_entsize(mp, namelen: 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, db: 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 kfree(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(i8count: sfp->i8count));
385 /*
386 * Compute entry (and change in) size.
387 */
388 incr_isize = xfs_dir2_sf_entsize(mp: dp->i_mount, hdr: sfp, len: 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, sfepp: &sfep, offsetp: &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, off: 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 = kmalloc(old_isize, GFP_KERNEL | __GFP_NOFAIL);
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(hdr: oldsfp),
537 add_datasize = xfs_dir2_data_entsize(mp, namelen: args->namelen),
538 eof = (char *)oldsfep == &buf[old_isize];
539 !eof;
540 offset = new_offset + xfs_dir2_data_entsize(mp, namelen: oldsfep->namelen),
541 oldsfep = xfs_dir2_sf_nextentry(mp, hdr: oldsfp, sfep: oldsfep),
542 eof = (char *)oldsfep == &buf[old_isize]) {
543 new_offset = xfs_dir2_sf_get_offset(sfep: 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, off: 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, hdr: sfp, sfep);
577 memcpy(sfep, oldsfep, old_isize - nbytes);
578 }
579 kfree(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, namelen: args->namelen);
609 offset = args->geo->data_first_offset;
610 sfep = xfs_dir2_sf_firstentry(hdr: 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, namelen: sfep->namelen);
622 sfep = xfs_dir2_sf_nextentry(mp, hdr: 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(hdr: 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, hdr: 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, namelen: 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(i8count: 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(hdr: sfp); i < sfp->count;
886 i++, sfep = xfs_dir2_sf_nextentry(mp, hdr: 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, name: sfep->name, len: 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, name: ci_sfep->name, len: 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(i8count: 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(hdr: sfp); i < sfp->count;
943 i++, sfep = xfs_dir2_sf_nextentry(mp, hdr: sfp, sfep)) {
944 if (xfs_da_compname(args, name: sfep->name, len: 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, hdr: sfp, len: 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(i8count: 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(hdr: sfp); i < sfp->count;
1075 i++, sfep = xfs_dir2_sf_nextentry(mp, hdr: sfp, sfep)) {
1076 if (xfs_da_compname(args, name: sfep->name, len: 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 = kmalloc(oldsize, GFP_KERNEL | __GFP_NOFAIL);
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(hdr: sfp),
1178 oldsfep = xfs_dir2_sf_firstentry(hdr: oldsfp);
1179 i < sfp->count;
1180 i++, sfep = xfs_dir2_sf_nextentry(mp, hdr: sfp, sfep),
1181 oldsfep = xfs_dir2_sf_nextentry(mp, hdr: oldsfp, sfep: 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 kfree(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 = kmalloc(oldsize, GFP_KERNEL | __GFP_NOFAIL);
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(hdr: sfp),
1250 oldsfep = xfs_dir2_sf_firstentry(hdr: oldsfp);
1251 i < sfp->count;
1252 i++, sfep = xfs_dir2_sf_nextentry(mp, hdr: sfp, sfep),
1253 oldsfep = xfs_dir2_sf_nextentry(mp, hdr: oldsfp, sfep: 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 kfree(buf);
1266 dp->i_disk_size = newsize;
1267 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1268}
1269

source code of linux/fs/xfs/libxfs/xfs_dir2_sf.c