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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_types.h"
21#include "xfs_log.h"
22#include "xfs_trans.h"
23#include "xfs_sb.h"
24#include "xfs_ag.h"
25#include "xfs_mount.h"
26#include "xfs_da_btree.h"
27#include "xfs_bmap_btree.h"
28#include "xfs_dinode.h"
29#include "xfs_inode.h"
30#include "xfs_inode_item.h"
31#include "xfs_error.h"
32#include "xfs_dir2.h"
33#include "xfs_dir2_format.h"
34#include "xfs_dir2_priv.h"
35#include "xfs_trace.h"
36
37/*
38 * Prototypes for internal functions.
39 */
40static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args,
41 xfs_dir2_sf_entry_t *sfep,
42 xfs_dir2_data_aoff_t offset,
43 int new_isize);
44static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange,
45 int new_isize);
46static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange,
47 xfs_dir2_sf_entry_t **sfepp,
48 xfs_dir2_data_aoff_t *offsetp);
49#ifdef DEBUG
50static void xfs_dir2_sf_check(xfs_da_args_t *args);
51#else
52#define xfs_dir2_sf_check(args)
53#endif /* DEBUG */
54#if XFS_BIG_INUMS
55static void xfs_dir2_sf_toino4(xfs_da_args_t *args);
56static void xfs_dir2_sf_toino8(xfs_da_args_t *args);
57#endif /* XFS_BIG_INUMS */
58
59/*
60 * Inode numbers in short-form directories can come in two versions,
61 * either 4 bytes or 8 bytes wide. These helpers deal with the
62 * two forms transparently by looking at the headers i8count field.
63 *
64 * For 64-bit inode number the most significant byte must be zero.
65 */
66static xfs_ino_t
67xfs_dir2_sf_get_ino(
68 struct xfs_dir2_sf_hdr *hdr,
69 xfs_dir2_inou_t *from)
70{
71 if (hdr->i8count)
72 return get_unaligned_be64(&from->i8.i) & 0x00ffffffffffffffULL;
73 else
74 return get_unaligned_be32(&from->i4.i);
75}
76
77static void
78xfs_dir2_sf_put_ino(
79 struct xfs_dir2_sf_hdr *hdr,
80 xfs_dir2_inou_t *to,
81 xfs_ino_t ino)
82{
83 ASSERT((ino & 0xff00000000000000ULL) == 0);
84
85 if (hdr->i8count)
86 put_unaligned_be64(ino, &to->i8.i);
87 else
88 put_unaligned_be32(ino, &to->i4.i);
89}
90
91xfs_ino_t
92xfs_dir2_sf_get_parent_ino(
93 struct xfs_dir2_sf_hdr *hdr)
94{
95 return xfs_dir2_sf_get_ino(hdr, &hdr->parent);
96}
97
98static void
99xfs_dir2_sf_put_parent_ino(
100 struct xfs_dir2_sf_hdr *hdr,
101 xfs_ino_t ino)
102{
103 xfs_dir2_sf_put_ino(hdr, &hdr->parent, ino);
104}
105
106/*
107 * In short-form directory entries the inode numbers are stored at variable
108 * offset behind the entry name. The inode numbers may only be accessed
109 * through the helpers below.
110 */
111static xfs_dir2_inou_t *
112xfs_dir2_sfe_inop(
113 struct xfs_dir2_sf_entry *sfep)
114{
115 return (xfs_dir2_inou_t *)&sfep->name[sfep->namelen];
116}
117
118xfs_ino_t
119xfs_dir2_sfe_get_ino(
120 struct xfs_dir2_sf_hdr *hdr,
121 struct xfs_dir2_sf_entry *sfep)
122{
123 return xfs_dir2_sf_get_ino(hdr, xfs_dir2_sfe_inop(sfep));
124}
125
126static void
127xfs_dir2_sfe_put_ino(
128 struct xfs_dir2_sf_hdr *hdr,
129 struct xfs_dir2_sf_entry *sfep,
130 xfs_ino_t ino)
131{
132 xfs_dir2_sf_put_ino(hdr, xfs_dir2_sfe_inop(sfep), ino);
133}
134
135/*
136 * Given a block directory (dp/block), calculate its size as a shortform (sf)
137 * directory and a header for the sf directory, if it will fit it the
138 * space currently present in the inode. If it won't fit, the output
139 * size is too big (but not accurate).
140 */
141int /* size for sf form */
142xfs_dir2_block_sfsize(
143 xfs_inode_t *dp, /* incore inode pointer */
144 xfs_dir2_data_hdr_t *hdr, /* block directory data */
145 xfs_dir2_sf_hdr_t *sfhp) /* output: header for sf form */
146{
147 xfs_dir2_dataptr_t addr; /* data entry address */
148 xfs_dir2_leaf_entry_t *blp; /* leaf area of the block */
149 xfs_dir2_block_tail_t *btp; /* tail area of the block */
150 int count; /* shortform entry count */
151 xfs_dir2_data_entry_t *dep; /* data entry in the block */
152 int i; /* block entry index */
153 int i8count; /* count of big-inode entries */
154 int isdot; /* entry is "." */
155 int isdotdot; /* entry is ".." */
156 xfs_mount_t *mp; /* mount structure pointer */
157 int namelen; /* total name bytes */
158 xfs_ino_t parent = 0; /* parent inode number */
159 int size=0; /* total computed size */
160
161 mp = dp->i_mount;
162
163 count = i8count = namelen = 0;
164 btp = xfs_dir2_block_tail_p(mp, hdr);
165 blp = xfs_dir2_block_leaf_p(btp);
166
167 /*
168 * Iterate over the block's data entries by using the leaf pointers.
169 */
170 for (i = 0; i < be32_to_cpu(btp->count); i++) {
171 if ((addr = be32_to_cpu(blp[i].address)) == XFS_DIR2_NULL_DATAPTR)
172 continue;
173 /*
174 * Calculate the pointer to the entry at hand.
175 */
176 dep = (xfs_dir2_data_entry_t *)
177 ((char *)hdr + xfs_dir2_dataptr_to_off(mp, addr));
178 /*
179 * Detect . and .., so we can special-case them.
180 * . is not included in sf directories.
181 * .. is included by just the parent inode number.
182 */
183 isdot = dep->namelen == 1 && dep->name[0] == '.';
184 isdotdot =
185 dep->namelen == 2 &&
186 dep->name[0] == '.' && dep->name[1] == '.';
187#if XFS_BIG_INUMS
188 if (!isdot)
189 i8count += be64_to_cpu(dep->inumber) > XFS_DIR2_MAX_SHORT_INUM;
190#endif
191 if (!isdot && !isdotdot) {
192 count++;
193 namelen += dep->namelen;
194 } else if (isdotdot)
195 parent = be64_to_cpu(dep->inumber);
196 /*
197 * Calculate the new size, see if we should give up yet.
198 */
199 size = xfs_dir2_sf_hdr_size(i8count) + /* header */
200 count + /* namelen */
201 count * (uint)sizeof(xfs_dir2_sf_off_t) + /* offset */
202 namelen + /* name */
203 (i8count ? /* inumber */
204 (uint)sizeof(xfs_dir2_ino8_t) * count :
205 (uint)sizeof(xfs_dir2_ino4_t) * count);
206 if (size > XFS_IFORK_DSIZE(dp))
207 return size; /* size value is a failure */
208 }
209 /*
210 * Create the output header, if it worked.
211 */
212 sfhp->count = count;
213 sfhp->i8count = i8count;
214 xfs_dir2_sf_put_parent_ino(sfhp, parent);
215 return size;
216}
217
218/*
219 * Convert a block format directory to shortform.
220 * Caller has already checked that it will fit, and built us a header.
221 */
222int /* error */
223xfs_dir2_block_to_sf(
224 xfs_da_args_t *args, /* operation arguments */
225 xfs_dabuf_t *bp, /* block buffer */
226 int size, /* shortform directory size */
227 xfs_dir2_sf_hdr_t *sfhp) /* shortform directory hdr */
228{
229 xfs_dir2_data_hdr_t *hdr; /* block header */
230 xfs_dir2_block_tail_t *btp; /* block tail pointer */
231 xfs_dir2_data_entry_t *dep; /* data entry pointer */
232 xfs_inode_t *dp; /* incore directory inode */
233 xfs_dir2_data_unused_t *dup; /* unused data pointer */
234 char *endptr; /* end of data entries */
235 int error; /* error return value */
236 int logflags; /* inode logging flags */
237 xfs_mount_t *mp; /* filesystem mount point */
238 char *ptr; /* current data pointer */
239 xfs_dir2_sf_entry_t *sfep; /* shortform entry */
240 xfs_dir2_sf_hdr_t *sfp; /* shortform directory header */
241
242 trace_xfs_dir2_block_to_sf(args);
243
244 dp = args->dp;
245 mp = dp->i_mount;
246
247 /*
248 * Make a copy of the block data, so we can shrink the inode
249 * and add local data.
250 */
251 hdr = kmem_alloc(mp->m_dirblksize, KM_SLEEP);
252 memcpy(hdr, bp->data, mp->m_dirblksize);
253 logflags = XFS_ILOG_CORE;
254 if ((error = xfs_dir2_shrink_inode(args, mp->m_dirdatablk, bp))) {
255 ASSERT(error != ENOSPC);
256 goto out;
257 }
258
259 /*
260 * The buffer is now unconditionally gone, whether
261 * xfs_dir2_shrink_inode worked or not.
262 *
263 * Convert the inode to local format.
264 */
265 dp->i_df.if_flags &= ~XFS_IFEXTENTS;
266 dp->i_df.if_flags |= XFS_IFINLINE;
267 dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
268 ASSERT(dp->i_df.if_bytes == 0);
269 xfs_idata_realloc(dp, size, XFS_DATA_FORK);
270 logflags |= XFS_ILOG_DDATA;
271 /*
272 * Copy the header into the newly allocate local space.
273 */
274 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
275 memcpy(sfp, sfhp, xfs_dir2_sf_hdr_size(sfhp->i8count));
276 dp->i_d.di_size = size;
277 /*
278 * Set up to loop over the block's entries.
279 */
280 btp = xfs_dir2_block_tail_p(mp, hdr);
281 ptr = (char *)(hdr + 1);
282 endptr = (char *)xfs_dir2_block_leaf_p(btp);
283 sfep = xfs_dir2_sf_firstentry(sfp);
284 /*
285 * Loop over the active and unused entries.
286 * Stop when we reach the leaf/tail portion of the block.
287 */
288 while (ptr < endptr) {
289 /*
290 * If it's unused, just skip over it.
291 */
292 dup = (xfs_dir2_data_unused_t *)ptr;
293 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
294 ptr += be16_to_cpu(dup->length);
295 continue;
296 }
297 dep = (xfs_dir2_data_entry_t *)ptr;
298 /*
299 * Skip .
300 */
301 if (dep->namelen == 1 && dep->name[0] == '.')
302 ASSERT(be64_to_cpu(dep->inumber) == dp->i_ino);
303 /*
304 * Skip .., but make sure the inode number is right.
305 */
306 else if (dep->namelen == 2 &&
307 dep->name[0] == '.' && dep->name[1] == '.')
308 ASSERT(be64_to_cpu(dep->inumber) ==
309 xfs_dir2_sf_get_parent_ino(sfp));
310 /*
311 * Normal entry, copy it into shortform.
312 */
313 else {
314 sfep->namelen = dep->namelen;
315 xfs_dir2_sf_put_offset(sfep,
316 (xfs_dir2_data_aoff_t)
317 ((char *)dep - (char *)hdr));
318 memcpy(sfep->name, dep->name, dep->namelen);
319 xfs_dir2_sfe_put_ino(sfp, sfep,
320 be64_to_cpu(dep->inumber));
321
322 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
323 }
324 ptr += xfs_dir2_data_entsize(dep->namelen);
325 }
326 ASSERT((char *)sfep - (char *)sfp == size);
327 xfs_dir2_sf_check(args);
328out:
329 xfs_trans_log_inode(args->trans, dp, logflags);
330 kmem_free(hdr);
331 return error;
332}
333
334/*
335 * Add a name to a shortform directory.
336 * There are two algorithms, "easy" and "hard" which we decide on
337 * before changing anything.
338 * Convert to block form if necessary, if the new entry won't fit.
339 */
340int /* error */
341xfs_dir2_sf_addname(
342 xfs_da_args_t *args) /* operation arguments */
343{
344 int add_entsize; /* size of the new entry */
345 xfs_inode_t *dp; /* incore directory inode */
346 int error; /* error return value */
347 int incr_isize; /* total change in size */
348 int new_isize; /* di_size after adding name */
349 int objchange; /* changing to 8-byte inodes */
350 xfs_dir2_data_aoff_t offset = 0; /* offset for new entry */
351 int old_isize; /* di_size before adding name */
352 int pick; /* which algorithm to use */
353 xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
354 xfs_dir2_sf_entry_t *sfep = NULL; /* shortform entry */
355
356 trace_xfs_dir2_sf_addname(args);
357
358 ASSERT(xfs_dir2_sf_lookup(args) == ENOENT);
359 dp = args->dp;
360 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
361 /*
362 * Make sure the shortform value has some of its header.
363 */
364 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
365 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
366 return XFS_ERROR(EIO);
367 }
368 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
369 ASSERT(dp->i_df.if_u1.if_data != NULL);
370 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
371 ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
372 /*
373 * Compute entry (and change in) size.
374 */
375 add_entsize = xfs_dir2_sf_entsize(sfp, args->namelen);
376 incr_isize = add_entsize;
377 objchange = 0;
378#if XFS_BIG_INUMS
379 /*
380 * Do we have to change to 8 byte inodes?
381 */
382 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
383 /*
384 * Yes, adjust the entry size and the total size.
385 */
386 add_entsize +=
387 (uint)sizeof(xfs_dir2_ino8_t) -
388 (uint)sizeof(xfs_dir2_ino4_t);
389 incr_isize +=
390 (sfp->count + 2) *
391 ((uint)sizeof(xfs_dir2_ino8_t) -
392 (uint)sizeof(xfs_dir2_ino4_t));
393 objchange = 1;
394 }
395#endif
396 old_isize = (int)dp->i_d.di_size;
397 new_isize = old_isize + incr_isize;
398 /*
399 * Won't fit as shortform any more (due to size),
400 * or the pick routine says it won't (due to offset values).
401 */
402 if (new_isize > XFS_IFORK_DSIZE(dp) ||
403 (pick =
404 xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) {
405 /*
406 * Just checking or no space reservation, it doesn't fit.
407 */
408 if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0)
409 return XFS_ERROR(ENOSPC);
410 /*
411 * Convert to block form then add the name.
412 */
413 error = xfs_dir2_sf_to_block(args);
414 if (error)
415 return error;
416 return xfs_dir2_block_addname(args);
417 }
418 /*
419 * Just checking, it fits.
420 */
421 if (args->op_flags & XFS_DA_OP_JUSTCHECK)
422 return 0;
423 /*
424 * Do it the easy way - just add it at the end.
425 */
426 if (pick == 1)
427 xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize);
428 /*
429 * Do it the hard way - look for a place to insert the new entry.
430 * Convert to 8 byte inode numbers first if necessary.
431 */
432 else {
433 ASSERT(pick == 2);
434#if XFS_BIG_INUMS
435 if (objchange)
436 xfs_dir2_sf_toino8(args);
437#endif
438 xfs_dir2_sf_addname_hard(args, objchange, new_isize);
439 }
440 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
441 return 0;
442}
443
444/*
445 * Add the new entry the "easy" way.
446 * This is copying the old directory and adding the new entry at the end.
447 * Since it's sorted by "offset" we need room after the last offset
448 * that's already there, and then room to convert to a block directory.
449 * This is already checked by the pick routine.
450 */
451static void
452xfs_dir2_sf_addname_easy(
453 xfs_da_args_t *args, /* operation arguments */
454 xfs_dir2_sf_entry_t *sfep, /* pointer to new entry */
455 xfs_dir2_data_aoff_t offset, /* offset to use for new ent */
456 int new_isize) /* new directory size */
457{
458 int byteoff; /* byte offset in sf dir */
459 xfs_inode_t *dp; /* incore directory inode */
460 xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
461
462 dp = args->dp;
463
464 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
465 byteoff = (int)((char *)sfep - (char *)sfp);
466 /*
467 * Grow the in-inode space.
468 */
469 xfs_idata_realloc(dp, xfs_dir2_sf_entsize(sfp, args->namelen),
470 XFS_DATA_FORK);
471 /*
472 * Need to set up again due to realloc of the inode data.
473 */
474 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
475 sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + byteoff);
476 /*
477 * Fill in the new entry.
478 */
479 sfep->namelen = args->namelen;
480 xfs_dir2_sf_put_offset(sfep, offset);
481 memcpy(sfep->name, args->name, sfep->namelen);
482 xfs_dir2_sfe_put_ino(sfp, sfep, args->inumber);
483 /*
484 * Update the header and inode.
485 */
486 sfp->count++;
487#if XFS_BIG_INUMS
488 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM)
489 sfp->i8count++;
490#endif
491 dp->i_d.di_size = new_isize;
492 xfs_dir2_sf_check(args);
493}
494
495/*
496 * Add the new entry the "hard" way.
497 * The caller has already converted to 8 byte inode numbers if necessary,
498 * in which case we need to leave the i8count at 1.
499 * Find a hole that the new entry will fit into, and copy
500 * the first part of the entries, the new entry, and the last part of
501 * the entries.
502 */
503/* ARGSUSED */
504static void
505xfs_dir2_sf_addname_hard(
506 xfs_da_args_t *args, /* operation arguments */
507 int objchange, /* changing inode number size */
508 int new_isize) /* new directory size */
509{
510 int add_datasize; /* data size need for new ent */
511 char *buf; /* buffer for old */
512 xfs_inode_t *dp; /* incore directory inode */
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 di_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 dp = args->dp;
527
528 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
529 old_isize = (int)dp->i_d.di_size;
530 buf = kmem_alloc(old_isize, KM_SLEEP);
531 oldsfp = (xfs_dir2_sf_hdr_t *)buf;
532 memcpy(oldsfp, sfp, old_isize);
533 /*
534 * Loop over the old directory finding the place we're going
535 * to insert the new entry.
536 * If it's going to end up at the end then oldsfep will point there.
537 */
538 for (offset = XFS_DIR2_DATA_FIRST_OFFSET,
539 oldsfep = xfs_dir2_sf_firstentry(oldsfp),
540 add_datasize = xfs_dir2_data_entsize(args->namelen),
541 eof = (char *)oldsfep == &buf[old_isize];
542 !eof;
543 offset = new_offset + xfs_dir2_data_entsize(oldsfep->namelen),
544 oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep),
545 eof = (char *)oldsfep == &buf[old_isize]) {
546 new_offset = xfs_dir2_sf_get_offset(oldsfep);
547 if (offset + add_datasize <= new_offset)
548 break;
549 }
550 /*
551 * Get rid of the old directory, then allocate space for
552 * the new one. We do this so xfs_idata_realloc won't copy
553 * the data.
554 */
555 xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK);
556 xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK);
557 /*
558 * Reset the pointer since the buffer was reallocated.
559 */
560 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
561 /*
562 * Copy the first part of the directory, including the header.
563 */
564 nbytes = (int)((char *)oldsfep - (char *)oldsfp);
565 memcpy(sfp, oldsfp, nbytes);
566 sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes);
567 /*
568 * Fill in the new entry, and update the header counts.
569 */
570 sfep->namelen = args->namelen;
571 xfs_dir2_sf_put_offset(sfep, offset);
572 memcpy(sfep->name, args->name, sfep->namelen);
573 xfs_dir2_sfe_put_ino(sfp, sfep, args->inumber);
574 sfp->count++;
575#if XFS_BIG_INUMS
576 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange)
577 sfp->i8count++;
578#endif
579 /*
580 * If there's more left to copy, do that.
581 */
582 if (!eof) {
583 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
584 memcpy(sfep, oldsfep, old_isize - nbytes);
585 }
586 kmem_free(buf);
587 dp->i_d.di_size = new_isize;
588 xfs_dir2_sf_check(args);
589}
590
591/*
592 * Decide if the new entry will fit at all.
593 * If it will fit, pick between adding the new entry to the end (easy)
594 * or somewhere else (hard).
595 * Return 0 (won't fit), 1 (easy), 2 (hard).
596 */
597/*ARGSUSED*/
598static int /* pick result */
599xfs_dir2_sf_addname_pick(
600 xfs_da_args_t *args, /* operation arguments */
601 int objchange, /* inode # size changes */
602 xfs_dir2_sf_entry_t **sfepp, /* out(1): new entry ptr */
603 xfs_dir2_data_aoff_t *offsetp) /* out(1): new offset */
604{
605 xfs_inode_t *dp; /* incore directory inode */
606 int holefit; /* found hole it will fit in */
607 int i; /* entry number */
608 xfs_mount_t *mp; /* filesystem mount point */
609 xfs_dir2_data_aoff_t offset; /* data block offset */
610 xfs_dir2_sf_entry_t *sfep; /* shortform entry */
611 xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
612 int size; /* entry's data size */
613 int used; /* data bytes used */
614
615 dp = args->dp;
616 mp = dp->i_mount;
617
618 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
619 size = xfs_dir2_data_entsize(args->namelen);
620 offset = XFS_DIR2_DATA_FIRST_OFFSET;
621 sfep = xfs_dir2_sf_firstentry(sfp);
622 holefit = 0;
623 /*
624 * Loop over sf entries.
625 * Keep track of data offset and whether we've seen a place
626 * to insert the new entry.
627 */
628 for (i = 0; i < sfp->count; i++) {
629 if (!holefit)
630 holefit = offset + size <= xfs_dir2_sf_get_offset(sfep);
631 offset = xfs_dir2_sf_get_offset(sfep) +
632 xfs_dir2_data_entsize(sfep->namelen);
633 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
634 }
635 /*
636 * Calculate data bytes used excluding the new entry, if this
637 * was a data block (block form directory).
638 */
639 used = offset +
640 (sfp->count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
641 (uint)sizeof(xfs_dir2_block_tail_t);
642 /*
643 * If it won't fit in a block form then we can't insert it,
644 * we'll go back, convert to block, then try the insert and convert
645 * to leaf.
646 */
647 if (used + (holefit ? 0 : size) > mp->m_dirblksize)
648 return 0;
649 /*
650 * If changing the inode number size, do it the hard way.
651 */
652#if XFS_BIG_INUMS
653 if (objchange) {
654 return 2;
655 }
656#else
657 ASSERT(objchange == 0);
658#endif
659 /*
660 * If it won't fit at the end then do it the hard way (use the hole).
661 */
662 if (used + size > mp->m_dirblksize)
663 return 2;
664 /*
665 * Do it the easy way.
666 */
667 *sfepp = sfep;
668 *offsetp = offset;
669 return 1;
670}
671
672#ifdef DEBUG
673/*
674 * Check consistency of shortform directory, assert if bad.
675 */
676static void
677xfs_dir2_sf_check(
678 xfs_da_args_t *args) /* operation arguments */
679{
680 xfs_inode_t *dp; /* incore directory inode */
681 int i; /* entry number */
682 int i8count; /* number of big inode#s */
683 xfs_ino_t ino; /* entry inode number */
684 int offset; /* data offset */
685 xfs_dir2_sf_entry_t *sfep; /* shortform dir entry */
686 xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
687
688 dp = args->dp;
689
690 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
691 offset = XFS_DIR2_DATA_FIRST_OFFSET;
692 ino = xfs_dir2_sf_get_parent_ino(sfp);
693 i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
694
695 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
696 i < sfp->count;
697 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
698 ASSERT(xfs_dir2_sf_get_offset(sfep) >= offset);
699 ino = xfs_dir2_sfe_get_ino(sfp, sfep);
700 i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
701 offset =
702 xfs_dir2_sf_get_offset(sfep) +
703 xfs_dir2_data_entsize(sfep->namelen);
704 }
705 ASSERT(i8count == sfp->i8count);
706 ASSERT(XFS_BIG_INUMS || i8count == 0);
707 ASSERT((char *)sfep - (char *)sfp == dp->i_d.di_size);
708 ASSERT(offset +
709 (sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
710 (uint)sizeof(xfs_dir2_block_tail_t) <=
711 dp->i_mount->m_dirblksize);
712}
713#endif /* DEBUG */
714
715/*
716 * Create a new (shortform) directory.
717 */
718int /* error, always 0 */
719xfs_dir2_sf_create(
720 xfs_da_args_t *args, /* operation arguments */
721 xfs_ino_t pino) /* parent inode number */
722{
723 xfs_inode_t *dp; /* incore directory inode */
724 int i8count; /* parent inode is an 8-byte number */
725 xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
726 int size; /* directory size */
727
728 trace_xfs_dir2_sf_create(args);
729
730 dp = args->dp;
731
732 ASSERT(dp != NULL);
733 ASSERT(dp->i_d.di_size == 0);
734 /*
735 * If it's currently a zero-length extent file,
736 * convert it to local format.
737 */
738 if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) {
739 dp->i_df.if_flags &= ~XFS_IFEXTENTS; /* just in case */
740 dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
741 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
742 dp->i_df.if_flags |= XFS_IFINLINE;
743 }
744 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
745 ASSERT(dp->i_df.if_bytes == 0);
746 i8count = pino > XFS_DIR2_MAX_SHORT_INUM;
747 size = xfs_dir2_sf_hdr_size(i8count);
748 /*
749 * Make a buffer for the data.
750 */
751 xfs_idata_realloc(dp, size, XFS_DATA_FORK);
752 /*
753 * Fill in the header,
754 */
755 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
756 sfp->i8count = i8count;
757 /*
758 * Now can put in the inode number, since i8count is set.
759 */
760 xfs_dir2_sf_put_parent_ino(sfp, pino);
761 sfp->count = 0;
762 dp->i_d.di_size = size;
763 xfs_dir2_sf_check(args);
764 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
765 return 0;
766}
767
768int /* error */
769xfs_dir2_sf_getdents(
770 xfs_inode_t *dp, /* incore directory inode */
771 void *dirent,
772 xfs_off_t *offset,
773 filldir_t filldir)
774{
775 int i; /* shortform entry number */
776 xfs_mount_t *mp; /* filesystem mount point */
777 xfs_dir2_dataptr_t off; /* current entry's offset */
778 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
779 xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
780 xfs_dir2_dataptr_t dot_offset;
781 xfs_dir2_dataptr_t dotdot_offset;
782 xfs_ino_t ino;
783
784 mp = dp->i_mount;
785
786 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
787 /*
788 * Give up if the directory is way too short.
789 */
790 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
791 ASSERT(XFS_FORCED_SHUTDOWN(mp));
792 return XFS_ERROR(EIO);
793 }
794
795 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
796 ASSERT(dp->i_df.if_u1.if_data != NULL);
797
798 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
799
800 ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
801
802 /*
803 * If the block number in the offset is out of range, we're done.
804 */
805 if (xfs_dir2_dataptr_to_db(mp, *offset) > mp->m_dirdatablk)
806 return 0;
807
808 /*
809 * Precalculate offsets for . and .. as we will always need them.
810 *
811 * XXX(hch): the second argument is sometimes 0 and sometimes
812 * mp->m_dirdatablk.
813 */
814 dot_offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
815 XFS_DIR2_DATA_DOT_OFFSET);
816 dotdot_offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
817 XFS_DIR2_DATA_DOTDOT_OFFSET);
818
819 /*
820 * Put . entry unless we're starting past it.
821 */
822 if (*offset <= dot_offset) {
823 if (filldir(dirent, ".", 1, dot_offset & 0x7fffffff, dp->i_ino, DT_DIR)) {
824 *offset = dot_offset & 0x7fffffff;
825 return 0;
826 }
827 }
828
829 /*
830 * Put .. entry unless we're starting past it.
831 */
832 if (*offset <= dotdot_offset) {
833 ino = xfs_dir2_sf_get_parent_ino(sfp);
834 if (filldir(dirent, "..", 2, dotdot_offset & 0x7fffffff, ino, DT_DIR)) {
835 *offset = dotdot_offset & 0x7fffffff;
836 return 0;
837 }
838 }
839
840 /*
841 * Loop while there are more entries and put'ing works.
842 */
843 sfep = xfs_dir2_sf_firstentry(sfp);
844 for (i = 0; i < sfp->count; i++) {
845 off = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
846 xfs_dir2_sf_get_offset(sfep));
847
848 if (*offset > off) {
849 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
850 continue;
851 }
852
853 ino = xfs_dir2_sfe_get_ino(sfp, sfep);
854 if (filldir(dirent, (char *)sfep->name, sfep->namelen,
855 off & 0x7fffffff, ino, DT_UNKNOWN)) {
856 *offset = off & 0x7fffffff;
857 return 0;
858 }
859 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
860 }
861
862 *offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk + 1, 0) &
863 0x7fffffff;
864 return 0;
865}
866
867/*
868 * Lookup an entry in a shortform directory.
869 * Returns EEXIST if found, ENOENT if not found.
870 */
871int /* error */
872xfs_dir2_sf_lookup(
873 xfs_da_args_t *args) /* operation arguments */
874{
875 xfs_inode_t *dp; /* incore directory inode */
876 int i; /* entry index */
877 int error;
878 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
879 xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
880 enum xfs_dacmp cmp; /* comparison result */
881 xfs_dir2_sf_entry_t *ci_sfep; /* case-insens. entry */
882
883 trace_xfs_dir2_sf_lookup(args);
884
885 xfs_dir2_sf_check(args);
886 dp = args->dp;
887
888 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
889 /*
890 * Bail out if the directory is way too short.
891 */
892 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
893 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
894 return XFS_ERROR(EIO);
895 }
896 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
897 ASSERT(dp->i_df.if_u1.if_data != NULL);
898 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
899 ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
900 /*
901 * Special case for .
902 */
903 if (args->namelen == 1 && args->name[0] == '.') {
904 args->inumber = dp->i_ino;
905 args->cmpresult = XFS_CMP_EXACT;
906 return XFS_ERROR(EEXIST);
907 }
908 /*
909 * Special case for ..
910 */
911 if (args->namelen == 2 &&
912 args->name[0] == '.' && args->name[1] == '.') {
913 args->inumber = xfs_dir2_sf_get_parent_ino(sfp);
914 args->cmpresult = XFS_CMP_EXACT;
915 return XFS_ERROR(EEXIST);
916 }
917 /*
918 * Loop over all the entries trying to match ours.
919 */
920 ci_sfep = NULL;
921 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
922 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
923 /*
924 * Compare name and if it's an exact match, return the inode
925 * number. If it's the first case-insensitive match, store the
926 * inode number and continue looking for an exact match.
927 */
928 cmp = dp->i_mount->m_dirnameops->compname(args, sfep->name,
929 sfep->namelen);
930 if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
931 args->cmpresult = cmp;
932 args->inumber = xfs_dir2_sfe_get_ino(sfp, sfep);
933 if (cmp == XFS_CMP_EXACT)
934 return XFS_ERROR(EEXIST);
935 ci_sfep = sfep;
936 }
937 }
938 ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
939 /*
940 * Here, we can only be doing a lookup (not a rename or replace).
941 * If a case-insensitive match was not found, return ENOENT.
942 */
943 if (!ci_sfep)
944 return XFS_ERROR(ENOENT);
945 /* otherwise process the CI match as required by the caller */
946 error = xfs_dir_cilookup_result(args, ci_sfep->name, ci_sfep->namelen);
947 return XFS_ERROR(error);
948}
949
950/*
951 * Remove an entry from a shortform directory.
952 */
953int /* error */
954xfs_dir2_sf_removename(
955 xfs_da_args_t *args)
956{
957 int byteoff; /* offset of removed entry */
958 xfs_inode_t *dp; /* incore directory inode */
959 int entsize; /* this entry's size */
960 int i; /* shortform entry index */
961 int newsize; /* new inode size */
962 int oldsize; /* old inode size */
963 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
964 xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
965
966 trace_xfs_dir2_sf_removename(args);
967
968 dp = args->dp;
969
970 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
971 oldsize = (int)dp->i_d.di_size;
972 /*
973 * Bail out if the directory is way too short.
974 */
975 if (oldsize < offsetof(xfs_dir2_sf_hdr_t, parent)) {
976 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
977 return XFS_ERROR(EIO);
978 }
979 ASSERT(dp->i_df.if_bytes == oldsize);
980 ASSERT(dp->i_df.if_u1.if_data != NULL);
981 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
982 ASSERT(oldsize >= xfs_dir2_sf_hdr_size(sfp->i8count));
983 /*
984 * Loop over the old directory entries.
985 * Find the one we're deleting.
986 */
987 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
988 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
989 if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
990 XFS_CMP_EXACT) {
991 ASSERT(xfs_dir2_sfe_get_ino(sfp, sfep) ==
992 args->inumber);
993 break;
994 }
995 }
996 /*
997 * Didn't find it.
998 */
999 if (i == sfp->count)
1000 return XFS_ERROR(ENOENT);
1001 /*
1002 * Calculate sizes.
1003 */
1004 byteoff = (int)((char *)sfep - (char *)sfp);
1005 entsize = xfs_dir2_sf_entsize(sfp, args->namelen);
1006 newsize = oldsize - entsize;
1007 /*
1008 * Copy the part if any after the removed entry, sliding it down.
1009 */
1010 if (byteoff + entsize < oldsize)
1011 memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize,
1012 oldsize - (byteoff + entsize));
1013 /*
1014 * Fix up the header and file size.
1015 */
1016 sfp->count--;
1017 dp->i_d.di_size = newsize;
1018 /*
1019 * Reallocate, making it smaller.
1020 */
1021 xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
1022 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1023#if XFS_BIG_INUMS
1024 /*
1025 * Are we changing inode number size?
1026 */
1027 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
1028 if (sfp->i8count == 1)
1029 xfs_dir2_sf_toino4(args);
1030 else
1031 sfp->i8count--;
1032 }
1033#endif
1034 xfs_dir2_sf_check(args);
1035 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1036 return 0;
1037}
1038
1039/*
1040 * Replace the inode number of an entry in a shortform directory.
1041 */
1042int /* error */
1043xfs_dir2_sf_replace(
1044 xfs_da_args_t *args) /* operation arguments */
1045{
1046 xfs_inode_t *dp; /* incore directory inode */
1047 int i; /* entry index */
1048#if XFS_BIG_INUMS || defined(DEBUG)
1049 xfs_ino_t ino=0; /* entry old inode number */
1050#endif
1051#if XFS_BIG_INUMS
1052 int i8elevated; /* sf_toino8 set i8count=1 */
1053#endif
1054 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
1055 xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
1056
1057 trace_xfs_dir2_sf_replace(args);
1058
1059 dp = args->dp;
1060
1061 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
1062 /*
1063 * Bail out if the shortform directory is way too small.
1064 */
1065 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
1066 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
1067 return XFS_ERROR(EIO);
1068 }
1069 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
1070 ASSERT(dp->i_df.if_u1.if_data != NULL);
1071 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1072 ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
1073#if XFS_BIG_INUMS
1074 /*
1075 * New inode number is large, and need to convert to 8-byte inodes.
1076 */
1077 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
1078 int error; /* error return value */
1079 int newsize; /* new inode size */
1080
1081 newsize =
1082 dp->i_df.if_bytes +
1083 (sfp->count + 1) *
1084 ((uint)sizeof(xfs_dir2_ino8_t) -
1085 (uint)sizeof(xfs_dir2_ino4_t));
1086 /*
1087 * Won't fit as shortform, convert to block then do replace.
1088 */
1089 if (newsize > XFS_IFORK_DSIZE(dp)) {
1090 error = xfs_dir2_sf_to_block(args);
1091 if (error) {
1092 return error;
1093 }
1094 return xfs_dir2_block_replace(args);
1095 }
1096 /*
1097 * Still fits, convert to 8-byte now.
1098 */
1099 xfs_dir2_sf_toino8(args);
1100 i8elevated = 1;
1101 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1102 } else
1103 i8elevated = 0;
1104#endif
1105 ASSERT(args->namelen != 1 || args->name[0] != '.');
1106 /*
1107 * Replace ..'s entry.
1108 */
1109 if (args->namelen == 2 &&
1110 args->name[0] == '.' && args->name[1] == '.') {
1111#if XFS_BIG_INUMS || defined(DEBUG)
1112 ino = xfs_dir2_sf_get_parent_ino(sfp);
1113 ASSERT(args->inumber != ino);
1114#endif
1115 xfs_dir2_sf_put_parent_ino(sfp, args->inumber);
1116 }
1117 /*
1118 * Normal entry, look for the name.
1119 */
1120 else {
1121 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
1122 i < sfp->count;
1123 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
1124 if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
1125 XFS_CMP_EXACT) {
1126#if XFS_BIG_INUMS || defined(DEBUG)
1127 ino = xfs_dir2_sfe_get_ino(sfp, sfep);
1128 ASSERT(args->inumber != ino);
1129#endif
1130 xfs_dir2_sfe_put_ino(sfp, sfep, args->inumber);
1131 break;
1132 }
1133 }
1134 /*
1135 * Didn't find it.
1136 */
1137 if (i == sfp->count) {
1138 ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
1139#if XFS_BIG_INUMS
1140 if (i8elevated)
1141 xfs_dir2_sf_toino4(args);
1142#endif
1143 return XFS_ERROR(ENOENT);
1144 }
1145 }
1146#if XFS_BIG_INUMS
1147 /*
1148 * See if the old number was large, the new number is small.
1149 */
1150 if (ino > XFS_DIR2_MAX_SHORT_INUM &&
1151 args->inumber <= XFS_DIR2_MAX_SHORT_INUM) {
1152 /*
1153 * And the old count was one, so need to convert to small.
1154 */
1155 if (sfp->i8count == 1)
1156 xfs_dir2_sf_toino4(args);
1157 else
1158 sfp->i8count--;
1159 }
1160 /*
1161 * See if the old number was small, the new number is large.
1162 */
1163 if (ino <= XFS_DIR2_MAX_SHORT_INUM &&
1164 args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
1165 /*
1166 * add to the i8count unless we just converted to 8-byte
1167 * inodes (which does an implied i8count = 1)
1168 */
1169 ASSERT(sfp->i8count != 0);
1170 if (!i8elevated)
1171 sfp->i8count++;
1172 }
1173#endif
1174 xfs_dir2_sf_check(args);
1175 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
1176 return 0;
1177}
1178
1179#if XFS_BIG_INUMS
1180/*
1181 * Convert from 8-byte inode numbers to 4-byte inode numbers.
1182 * The last 8-byte inode number is gone, but the count is still 1.
1183 */
1184static void
1185xfs_dir2_sf_toino4(
1186 xfs_da_args_t *args) /* operation arguments */
1187{
1188 char *buf; /* old dir's buffer */
1189 xfs_inode_t *dp; /* incore directory inode */
1190 int i; /* entry index */
1191 int newsize; /* new inode size */
1192 xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */
1193 xfs_dir2_sf_hdr_t *oldsfp; /* old sf directory */
1194 int oldsize; /* old inode size */
1195 xfs_dir2_sf_entry_t *sfep; /* new sf entry */
1196 xfs_dir2_sf_hdr_t *sfp; /* new sf directory */
1197
1198 trace_xfs_dir2_sf_toino4(args);
1199
1200 dp = args->dp;
1201
1202 /*
1203 * Copy the old directory to the buffer.
1204 * Then nuke it from the inode, and add the new buffer to the inode.
1205 * Don't want xfs_idata_realloc copying the data here.
1206 */
1207 oldsize = dp->i_df.if_bytes;
1208 buf = kmem_alloc(oldsize, KM_SLEEP);
1209 oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1210 ASSERT(oldsfp->i8count == 1);
1211 memcpy(buf, oldsfp, oldsize);
1212 /*
1213 * Compute the new inode size.
1214 */
1215 newsize =
1216 oldsize -
1217 (oldsfp->count + 1) *
1218 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
1219 xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1220 xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1221 /*
1222 * Reset our pointers, the data has moved.
1223 */
1224 oldsfp = (xfs_dir2_sf_hdr_t *)buf;
1225 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1226 /*
1227 * Fill in the new header.
1228 */
1229 sfp->count = oldsfp->count;
1230 sfp->i8count = 0;
1231 xfs_dir2_sf_put_parent_ino(sfp, xfs_dir2_sf_get_parent_ino(oldsfp));
1232 /*
1233 * Copy the entries field by field.
1234 */
1235 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1236 oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1237 i < sfp->count;
1238 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep),
1239 oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep)) {
1240 sfep->namelen = oldsfep->namelen;
1241 sfep->offset = oldsfep->offset;
1242 memcpy(sfep->name, oldsfep->name, sfep->namelen);
1243 xfs_dir2_sfe_put_ino(sfp, sfep,
1244 xfs_dir2_sfe_get_ino(oldsfp, oldsfep));
1245 }
1246 /*
1247 * Clean up the inode.
1248 */
1249 kmem_free(buf);
1250 dp->i_d.di_size = newsize;
1251 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1252}
1253
1254/*
1255 * Convert from 4-byte inode numbers to 8-byte inode numbers.
1256 * The new 8-byte inode number is not there yet, we leave with the
1257 * count 1 but no corresponding entry.
1258 */
1259static void
1260xfs_dir2_sf_toino8(
1261 xfs_da_args_t *args) /* operation arguments */
1262{
1263 char *buf; /* old dir's buffer */
1264 xfs_inode_t *dp; /* incore directory inode */
1265 int i; /* entry index */
1266 int newsize; /* new inode size */
1267 xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */
1268 xfs_dir2_sf_hdr_t *oldsfp; /* old sf directory */
1269 int oldsize; /* old inode size */
1270 xfs_dir2_sf_entry_t *sfep; /* new sf entry */
1271 xfs_dir2_sf_hdr_t *sfp; /* new sf directory */
1272
1273 trace_xfs_dir2_sf_toino8(args);
1274
1275 dp = args->dp;
1276
1277 /*
1278 * Copy the old directory to the buffer.
1279 * Then nuke it from the inode, and add the new buffer to the inode.
1280 * Don't want xfs_idata_realloc copying the data here.
1281 */
1282 oldsize = dp->i_df.if_bytes;
1283 buf = kmem_alloc(oldsize, KM_SLEEP);
1284 oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1285 ASSERT(oldsfp->i8count == 0);
1286 memcpy(buf, oldsfp, oldsize);
1287 /*
1288 * Compute the new inode size.
1289 */
1290 newsize =
1291 oldsize +
1292 (oldsfp->count + 1) *
1293 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
1294 xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1295 xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1296 /*
1297 * Reset our pointers, the data has moved.
1298 */
1299 oldsfp = (xfs_dir2_sf_hdr_t *)buf;
1300 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
1301 /*
1302 * Fill in the new header.
1303 */
1304 sfp->count = oldsfp->count;
1305 sfp->i8count = 1;
1306 xfs_dir2_sf_put_parent_ino(sfp, xfs_dir2_sf_get_parent_ino(oldsfp));
1307 /*
1308 * Copy the entries field by field.
1309 */
1310 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1311 oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1312 i < sfp->count;
1313 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep),
1314 oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep)) {
1315 sfep->namelen = oldsfep->namelen;
1316 sfep->offset = oldsfep->offset;
1317 memcpy(sfep->name, oldsfep->name, sfep->namelen);
1318 xfs_dir2_sfe_put_ino(sfp, sfep,
1319 xfs_dir2_sfe_get_ino(oldsfp, oldsfep));
1320 }
1321 /*
1322 * Clean up the inode.
1323 */
1324 kmem_free(buf);
1325 dp->i_d.di_size = newsize;
1326 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1327}
1328#endif /* XFS_BIG_INUMS */