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uml: speed up page table walking
[pv_ops_mirror.git] / fs / xfs / xfs_dir2_sf.c
blob0cd77b17bf92d8c2283e26420efe8a4528bc6679
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_inum.h"
23 #include "xfs_trans.h"
24 #include "xfs_sb.h"
25 #include "xfs_dir2.h"
26 #include "xfs_dmapi.h"
27 #include "xfs_mount.h"
28 #include "xfs_da_btree.h"
29 #include "xfs_bmap_btree.h"
30 #include "xfs_dir2_sf.h"
31 #include "xfs_attr_sf.h"
32 #include "xfs_dinode.h"
33 #include "xfs_inode.h"
34 #include "xfs_inode_item.h"
35 #include "xfs_error.h"
36 #include "xfs_dir2_data.h"
37 #include "xfs_dir2_leaf.h"
38 #include "xfs_dir2_block.h"
39 #include "xfs_dir2_trace.h"
40
41 /*
42 * Prototypes for internal functions.
43 */
44 static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args,
45 xfs_dir2_sf_entry_t *sfep,
46 xfs_dir2_data_aoff_t offset,
47 int new_isize);
48 static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange,
49 int new_isize);
50 static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange,
51 xfs_dir2_sf_entry_t **sfepp,
52 xfs_dir2_data_aoff_t *offsetp);
53 #ifdef DEBUG
54 static void xfs_dir2_sf_check(xfs_da_args_t *args);
55 #else
56 #define xfs_dir2_sf_check(args)
57 #endif /* DEBUG */
58 #if XFS_BIG_INUMS
59 static void xfs_dir2_sf_toino4(xfs_da_args_t *args);
60 static void xfs_dir2_sf_toino8(xfs_da_args_t *args);
61 #endif /* XFS_BIG_INUMS */
62
63 /*
64 * Given a block directory (dp/block), calculate its size as a shortform (sf)
65 * directory and a header for the sf directory, if it will fit it the
66 * space currently present in the inode. If it won't fit, the output
67 * size is too big (but not accurate).
68 */
69 int /* size for sf form */
70 xfs_dir2_block_sfsize(
71 xfs_inode_t *dp, /* incore inode pointer */
72 xfs_dir2_block_t *block, /* block directory data */
73 xfs_dir2_sf_hdr_t *sfhp) /* output: header for sf form */
74 {
75 xfs_dir2_dataptr_t addr; /* data entry address */
76 xfs_dir2_leaf_entry_t *blp; /* leaf area of the block */
77 xfs_dir2_block_tail_t *btp; /* tail area of the block */
78 int count; /* shortform entry count */
79 xfs_dir2_data_entry_t *dep; /* data entry in the block */
80 int i; /* block entry index */
81 int i8count; /* count of big-inode entries */
82 int isdot; /* entry is "." */
83 int isdotdot; /* entry is ".." */
84 xfs_mount_t *mp; /* mount structure pointer */
85 int namelen; /* total name bytes */
86 xfs_ino_t parent = 0; /* parent inode number */
87 int size=0; /* total computed size */
88
89 mp = dp->i_mount;
90
91 count = i8count = namelen = 0;
92 btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
93 blp = XFS_DIR2_BLOCK_LEAF_P(btp);
94
95 /*
96 * Iterate over the block's data entries by using the leaf pointers.
97 */
98 for (i = 0; i < be32_to_cpu(btp->count); i++) {
99 if ((addr = be32_to_cpu(blp[i].address)) == XFS_DIR2_NULL_DATAPTR)
100 continue;
101 /*
102 * Calculate the pointer to the entry at hand.
103 */
104 dep = (xfs_dir2_data_entry_t *)
105 ((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, addr));
106 /*
107 * Detect . and .., so we can special-case them.
108 * . is not included in sf directories.
109 * .. is included by just the parent inode number.
110 */
111 isdot = dep->namelen == 1 && dep->name[0] == '.';
112 isdotdot =
113 dep->namelen == 2 &&
114 dep->name[0] == '.' && dep->name[1] == '.';
115 #if XFS_BIG_INUMS
116 if (!isdot)
117 i8count += be64_to_cpu(dep->inumber) > XFS_DIR2_MAX_SHORT_INUM;
118 #endif
119 if (!isdot && !isdotdot) {
120 count++;
121 namelen += dep->namelen;
122 } else if (isdotdot)
123 parent = be64_to_cpu(dep->inumber);
124 /*
125 * Calculate the new size, see if we should give up yet.
126 */
127 size = XFS_DIR2_SF_HDR_SIZE(i8count) + /* header */
128 count + /* namelen */
129 count * (uint)sizeof(xfs_dir2_sf_off_t) + /* offset */
130 namelen + /* name */
131 (i8count ? /* inumber */
132 (uint)sizeof(xfs_dir2_ino8_t) * count :
133 (uint)sizeof(xfs_dir2_ino4_t) * count);
134 if (size > XFS_IFORK_DSIZE(dp))
135 return size; /* size value is a failure */
136 }
137 /*
138 * Create the output header, if it worked.
139 */
140 sfhp->count = count;
141 sfhp->i8count = i8count;
142 XFS_DIR2_SF_PUT_INUMBER((xfs_dir2_sf_t *)sfhp, &parent, &sfhp->parent);
143 return size;
144 }
145
146 /*
147 * Convert a block format directory to shortform.
148 * Caller has already checked that it will fit, and built us a header.
149 */
150 int /* error */
151 xfs_dir2_block_to_sf(
152 xfs_da_args_t *args, /* operation arguments */
153 xfs_dabuf_t *bp, /* block buffer */
154 int size, /* shortform directory size */
155 xfs_dir2_sf_hdr_t *sfhp) /* shortform directory hdr */
156 {
157 xfs_dir2_block_t *block; /* block structure */
158 xfs_dir2_block_tail_t *btp; /* block tail pointer */
159 xfs_dir2_data_entry_t *dep; /* data entry pointer */
160 xfs_inode_t *dp; /* incore directory inode */
161 xfs_dir2_data_unused_t *dup; /* unused data pointer */
162 char *endptr; /* end of data entries */
163 int error; /* error return value */
164 int logflags; /* inode logging flags */
165 xfs_mount_t *mp; /* filesystem mount point */
166 char *ptr; /* current data pointer */
167 xfs_dir2_sf_entry_t *sfep; /* shortform entry */
168 xfs_dir2_sf_t *sfp; /* shortform structure */
169 xfs_ino_t temp;
170
171 xfs_dir2_trace_args_sb("block_to_sf", args, size, bp);
172 dp = args->dp;
173 mp = dp->i_mount;
174
175 /*
176 * Make a copy of the block data, so we can shrink the inode
177 * and add local data.
178 */
179 block = kmem_alloc(mp->m_dirblksize, KM_SLEEP);
180 memcpy(block, bp->data, mp->m_dirblksize);
181 logflags = XFS_ILOG_CORE;
182 if ((error = xfs_dir2_shrink_inode(args, mp->m_dirdatablk, bp))) {
183 ASSERT(error != ENOSPC);
184 goto out;
185 }
186 /*
187 * The buffer is now unconditionally gone, whether
188 * xfs_dir2_shrink_inode worked or not.
189 *
190 * Convert the inode to local format.
191 */
192 dp->i_df.if_flags &= ~XFS_IFEXTENTS;
193 dp->i_df.if_flags |= XFS_IFINLINE;
194 dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
195 ASSERT(dp->i_df.if_bytes == 0);
196 xfs_idata_realloc(dp, size, XFS_DATA_FORK);
197 logflags |= XFS_ILOG_DDATA;
198 /*
199 * Copy the header into the newly allocate local space.
200 */
201 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
202 memcpy(sfp, sfhp, XFS_DIR2_SF_HDR_SIZE(sfhp->i8count));
203 dp->i_d.di_size = size;
204 /*
205 * Set up to loop over the block's entries.
206 */
207 btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
208 ptr = (char *)block->u;
209 endptr = (char *)XFS_DIR2_BLOCK_LEAF_P(btp);
210 sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
211 /*
212 * Loop over the active and unused entries.
213 * Stop when we reach the leaf/tail portion of the block.
214 */
215 while (ptr < endptr) {
216 /*
217 * If it's unused, just skip over it.
218 */
219 dup = (xfs_dir2_data_unused_t *)ptr;
220 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
221 ptr += be16_to_cpu(dup->length);
222 continue;
223 }
224 dep = (xfs_dir2_data_entry_t *)ptr;
225 /*
226 * Skip .
227 */
228 if (dep->namelen == 1 && dep->name[0] == '.')
229 ASSERT(be64_to_cpu(dep->inumber) == dp->i_ino);
230 /*
231 * Skip .., but make sure the inode number is right.
232 */
233 else if (dep->namelen == 2 &&
234 dep->name[0] == '.' && dep->name[1] == '.')
235 ASSERT(be64_to_cpu(dep->inumber) ==
236 XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent));
237 /*
238 * Normal entry, copy it into shortform.
239 */
240 else {
241 sfep->namelen = dep->namelen;
242 XFS_DIR2_SF_PUT_OFFSET(sfep,
243 (xfs_dir2_data_aoff_t)
244 ((char *)dep - (char *)block));
245 memcpy(sfep->name, dep->name, dep->namelen);
246 temp = be64_to_cpu(dep->inumber);
247 XFS_DIR2_SF_PUT_INUMBER(sfp, &temp,
248 XFS_DIR2_SF_INUMBERP(sfep));
249 sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep);
250 }
251 ptr += XFS_DIR2_DATA_ENTSIZE(dep->namelen);
252 }
253 ASSERT((char *)sfep - (char *)sfp == size);
254 xfs_dir2_sf_check(args);
255 out:
256 xfs_trans_log_inode(args->trans, dp, logflags);
257 kmem_free(block, mp->m_dirblksize);
258 return error;
259 }
260
261 /*
262 * Add a name to a shortform directory.
263 * There are two algorithms, "easy" and "hard" which we decide on
264 * before changing anything.
265 * Convert to block form if necessary, if the new entry won't fit.
266 */
267 int /* error */
268 xfs_dir2_sf_addname(
269 xfs_da_args_t *args) /* operation arguments */
270 {
271 int add_entsize; /* size of the new entry */
272 xfs_inode_t *dp; /* incore directory inode */
273 int error; /* error return value */
274 int incr_isize; /* total change in size */
275 int new_isize; /* di_size after adding name */
276 int objchange; /* changing to 8-byte inodes */
277 xfs_dir2_data_aoff_t offset = 0; /* offset for new entry */
278 int old_isize; /* di_size before adding name */
279 int pick; /* which algorithm to use */
280 xfs_dir2_sf_t *sfp; /* shortform structure */
281 xfs_dir2_sf_entry_t *sfep = NULL; /* shortform entry */
282
283 xfs_dir2_trace_args("sf_addname", args);
284 ASSERT(xfs_dir2_sf_lookup(args) == ENOENT);
285 dp = args->dp;
286 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
287 /*
288 * Make sure the shortform value has some of its header.
289 */
290 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
291 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
292 return XFS_ERROR(EIO);
293 }
294 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
295 ASSERT(dp->i_df.if_u1.if_data != NULL);
296 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
297 ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count));
298 /*
299 * Compute entry (and change in) size.
300 */
301 add_entsize = XFS_DIR2_SF_ENTSIZE_BYNAME(sfp, args->namelen);
302 incr_isize = add_entsize;
303 objchange = 0;
304 #if XFS_BIG_INUMS
305 /*
306 * Do we have to change to 8 byte inodes?
307 */
308 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->hdr.i8count == 0) {
309 /*
310 * Yes, adjust the entry size and the total size.
311 */
312 add_entsize +=
313 (uint)sizeof(xfs_dir2_ino8_t) -
314 (uint)sizeof(xfs_dir2_ino4_t);
315 incr_isize +=
316 (sfp->hdr.count + 2) *
317 ((uint)sizeof(xfs_dir2_ino8_t) -
318 (uint)sizeof(xfs_dir2_ino4_t));
319 objchange = 1;
320 }
321 #endif
322 old_isize = (int)dp->i_d.di_size;
323 new_isize = old_isize + incr_isize;
324 /*
325 * Won't fit as shortform any more (due to size),
326 * or the pick routine says it won't (due to offset values).
327 */
328 if (new_isize > XFS_IFORK_DSIZE(dp) ||
329 (pick =
330 xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) {
331 /*
332 * Just checking or no space reservation, it doesn't fit.
333 */
334 if (args->justcheck || args->total == 0)
335 return XFS_ERROR(ENOSPC);
336 /*
337 * Convert to block form then add the name.
338 */
339 error = xfs_dir2_sf_to_block(args);
340 if (error)
341 return error;
342 return xfs_dir2_block_addname(args);
343 }
344 /*
345 * Just checking, it fits.
346 */
347 if (args->justcheck)
348 return 0;
349 /*
350 * Do it the easy way - just add it at the end.
351 */
352 if (pick == 1)
353 xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize);
354 /*
355 * Do it the hard way - look for a place to insert the new entry.
356 * Convert to 8 byte inode numbers first if necessary.
357 */
358 else {
359 ASSERT(pick == 2);
360 #if XFS_BIG_INUMS
361 if (objchange)
362 xfs_dir2_sf_toino8(args);
363 #endif
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 */
377 static void
378 xfs_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_t *sfp; /* shortform structure */
387
388 dp = args->dp;
389
390 sfp = (xfs_dir2_sf_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, XFS_DIR2_SF_ENTSIZE_BYNAME(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_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 XFS_DIR2_SF_PUT_INUMBER(sfp, &args->inumber,
409 XFS_DIR2_SF_INUMBERP(sfep));
410 /*
411 * Update the header and inode.
412 */
413 sfp->hdr.count++;
414 #if XFS_BIG_INUMS
415 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM)
416 sfp->hdr.i8count++;
417 #endif
418 dp->i_d.di_size = new_isize;
419 xfs_dir2_sf_check(args);
420 }
421
422 /*
423 * Add the new entry the "hard" way.
424 * The caller has already converted to 8 byte inode numbers if necessary,
425 * in which case we need to leave the i8count at 1.
426 * Find a hole that the new entry will fit into, and copy
427 * the first part of the entries, the new entry, and the last part of
428 * the entries.
429 */
430 /* ARGSUSED */
431 static void
432 xfs_dir2_sf_addname_hard(
433 xfs_da_args_t *args, /* operation arguments */
434 int objchange, /* changing inode number size */
435 int new_isize) /* new directory size */
436 {
437 int add_datasize; /* data size need for new ent */
438 char *buf; /* buffer for old */
439 xfs_inode_t *dp; /* incore directory inode */
440 int eof; /* reached end of old dir */
441 int nbytes; /* temp for byte copies */
442 xfs_dir2_data_aoff_t new_offset; /* next offset value */
443 xfs_dir2_data_aoff_t offset; /* current offset value */
444 int old_isize; /* previous di_size */
445 xfs_dir2_sf_entry_t *oldsfep; /* entry in original dir */
446 xfs_dir2_sf_t *oldsfp; /* original shortform dir */
447 xfs_dir2_sf_entry_t *sfep; /* entry in new dir */
448 xfs_dir2_sf_t *sfp; /* new shortform dir */
449
450 /*
451 * Copy the old directory to the stack buffer.
452 */
453 dp = args->dp;
454
455 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
456 old_isize = (int)dp->i_d.di_size;
457 buf = kmem_alloc(old_isize, KM_SLEEP);
458 oldsfp = (xfs_dir2_sf_t *)buf;
459 memcpy(oldsfp, sfp, old_isize);
460 /*
461 * Loop over the old directory finding the place we're going
462 * to insert the new entry.
463 * If it's going to end up at the end then oldsfep will point there.
464 */
465 for (offset = XFS_DIR2_DATA_FIRST_OFFSET,
466 oldsfep = XFS_DIR2_SF_FIRSTENTRY(oldsfp),
467 add_datasize = XFS_DIR2_DATA_ENTSIZE(args->namelen),
468 eof = (char *)oldsfep == &buf[old_isize];
469 !eof;
470 offset = new_offset + XFS_DIR2_DATA_ENTSIZE(oldsfep->namelen),
471 oldsfep = XFS_DIR2_SF_NEXTENTRY(oldsfp, oldsfep),
472 eof = (char *)oldsfep == &buf[old_isize]) {
473 new_offset = XFS_DIR2_SF_GET_OFFSET(oldsfep);
474 if (offset + add_datasize <= new_offset)
475 break;
476 }
477 /*
478 * Get rid of the old directory, then allocate space for
479 * the new one. We do this so xfs_idata_realloc won't copy
480 * the data.
481 */
482 xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK);
483 xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK);
484 /*
485 * Reset the pointer since the buffer was reallocated.
486 */
487 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
488 /*
489 * Copy the first part of the directory, including the header.
490 */
491 nbytes = (int)((char *)oldsfep - (char *)oldsfp);
492 memcpy(sfp, oldsfp, nbytes);
493 sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes);
494 /*
495 * Fill in the new entry, and update the header counts.
496 */
497 sfep->namelen = args->namelen;
498 XFS_DIR2_SF_PUT_OFFSET(sfep, offset);
499 memcpy(sfep->name, args->name, sfep->namelen);
500 XFS_DIR2_SF_PUT_INUMBER(sfp, &args->inumber,
501 XFS_DIR2_SF_INUMBERP(sfep));
502 sfp->hdr.count++;
503 #if XFS_BIG_INUMS
504 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange)
505 sfp->hdr.i8count++;
506 #endif
507 /*
508 * If there's more left to copy, do that.
509 */
510 if (!eof) {
511 sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep);
512 memcpy(sfep, oldsfep, old_isize - nbytes);
513 }
514 kmem_free(buf, old_isize);
515 dp->i_d.di_size = new_isize;
516 xfs_dir2_sf_check(args);
517 }
518
519 /*
520 * Decide if the new entry will fit at all.
521 * If it will fit, pick between adding the new entry to the end (easy)
522 * or somewhere else (hard).
523 * Return 0 (won't fit), 1 (easy), 2 (hard).
524 */
525 /*ARGSUSED*/
526 static int /* pick result */
527 xfs_dir2_sf_addname_pick(
528 xfs_da_args_t *args, /* operation arguments */
529 int objchange, /* inode # size changes */
530 xfs_dir2_sf_entry_t **sfepp, /* out(1): new entry ptr */
531 xfs_dir2_data_aoff_t *offsetp) /* out(1): new offset */
532 {
533 xfs_inode_t *dp; /* incore directory inode */
534 int holefit; /* found hole it will fit in */
535 int i; /* entry number */
536 xfs_mount_t *mp; /* filesystem mount point */
537 xfs_dir2_data_aoff_t offset; /* data block offset */
538 xfs_dir2_sf_entry_t *sfep; /* shortform entry */
539 xfs_dir2_sf_t *sfp; /* shortform structure */
540 int size; /* entry's data size */
541 int used; /* data bytes used */
542
543 dp = args->dp;
544 mp = dp->i_mount;
545
546 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
547 size = XFS_DIR2_DATA_ENTSIZE(args->namelen);
548 offset = XFS_DIR2_DATA_FIRST_OFFSET;
549 sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
550 holefit = 0;
551 /*
552 * Loop over sf entries.
553 * Keep track of data offset and whether we've seen a place
554 * to insert the new entry.
555 */
556 for (i = 0; i < sfp->hdr.count; i++) {
557 if (!holefit)
558 holefit = offset + size <= XFS_DIR2_SF_GET_OFFSET(sfep);
559 offset = XFS_DIR2_SF_GET_OFFSET(sfep) +
560 XFS_DIR2_DATA_ENTSIZE(sfep->namelen);
561 sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep);
562 }
563 /*
564 * Calculate data bytes used excluding the new entry, if this
565 * was a data block (block form directory).
566 */
567 used = offset +
568 (sfp->hdr.count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
569 (uint)sizeof(xfs_dir2_block_tail_t);
570 /*
571 * If it won't fit in a block form then we can't insert it,
572 * we'll go back, convert to block, then try the insert and convert
573 * to leaf.
574 */
575 if (used + (holefit ? 0 : size) > mp->m_dirblksize)
576 return 0;
577 /*
578 * If changing the inode number size, do it the hard way.
579 */
580 #if XFS_BIG_INUMS
581 if (objchange) {
582 return 2;
583 }
584 #else
585 ASSERT(objchange == 0);
586 #endif
587 /*
588 * If it won't fit at the end then do it the hard way (use the hole).
589 */
590 if (used + size > mp->m_dirblksize)
591 return 2;
592 /*
593 * Do it the easy way.
594 */
595 *sfepp = sfep;
596 *offsetp = offset;
597 return 1;
598 }
599
600 #ifdef DEBUG
601 /*
602 * Check consistency of shortform directory, assert if bad.
603 */
604 static void
605 xfs_dir2_sf_check(
606 xfs_da_args_t *args) /* operation arguments */
607 {
608 xfs_inode_t *dp; /* incore directory inode */
609 int i; /* entry number */
610 int i8count; /* number of big inode#s */
611 xfs_ino_t ino; /* entry inode number */
612 int offset; /* data offset */
613 xfs_dir2_sf_entry_t *sfep; /* shortform dir entry */
614 xfs_dir2_sf_t *sfp; /* shortform structure */
615
616 dp = args->dp;
617
618 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
619 offset = XFS_DIR2_DATA_FIRST_OFFSET;
620 ino = XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent);
621 i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
622
623 for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
624 i < sfp->hdr.count;
625 i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) {
626 ASSERT(XFS_DIR2_SF_GET_OFFSET(sfep) >= offset);
627 ino = XFS_DIR2_SF_GET_INUMBER(sfp, XFS_DIR2_SF_INUMBERP(sfep));
628 i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
629 offset =
630 XFS_DIR2_SF_GET_OFFSET(sfep) +
631 XFS_DIR2_DATA_ENTSIZE(sfep->namelen);
632 }
633 ASSERT(i8count == sfp->hdr.i8count);
634 ASSERT(XFS_BIG_INUMS || i8count == 0);
635 ASSERT((char *)sfep - (char *)sfp == dp->i_d.di_size);
636 ASSERT(offset +
637 (sfp->hdr.count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
638 (uint)sizeof(xfs_dir2_block_tail_t) <=
639 dp->i_mount->m_dirblksize);
640 }
641 #endif /* DEBUG */
642
643 /*
644 * Create a new (shortform) directory.
645 */
646 int /* error, always 0 */
647 xfs_dir2_sf_create(
648 xfs_da_args_t *args, /* operation arguments */
649 xfs_ino_t pino) /* parent inode number */
650 {
651 xfs_inode_t *dp; /* incore directory inode */
652 int i8count; /* parent inode is an 8-byte number */
653 xfs_dir2_sf_t *sfp; /* shortform structure */
654 int size; /* directory size */
655
656 xfs_dir2_trace_args_i("sf_create", args, pino);
657 dp = args->dp;
658
659 ASSERT(dp != NULL);
660 ASSERT(dp->i_d.di_size == 0);
661 /*
662 * If it's currently a zero-length extent file,
663 * convert it to local format.
664 */
665 if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) {
666 dp->i_df.if_flags &= ~XFS_IFEXTENTS; /* just in case */
667 dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
668 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
669 dp->i_df.if_flags |= XFS_IFINLINE;
670 }
671 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
672 ASSERT(dp->i_df.if_bytes == 0);
673 i8count = pino > XFS_DIR2_MAX_SHORT_INUM;
674 size = XFS_DIR2_SF_HDR_SIZE(i8count);
675 /*
676 * Make a buffer for the data.
677 */
678 xfs_idata_realloc(dp, size, XFS_DATA_FORK);
679 /*
680 * Fill in the header,
681 */
682 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
683 sfp->hdr.i8count = i8count;
684 /*
685 * Now can put in the inode number, since i8count is set.
686 */
687 XFS_DIR2_SF_PUT_INUMBER(sfp, &pino, &sfp->hdr.parent);
688 sfp->hdr.count = 0;
689 dp->i_d.di_size = size;
690 xfs_dir2_sf_check(args);
691 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
692 return 0;
693 }
694
695 int /* error */
696 xfs_dir2_sf_getdents(
697 xfs_inode_t *dp, /* incore directory inode */
698 uio_t *uio, /* caller's buffer control */
699 int *eofp, /* eof reached? (out) */
700 xfs_dirent_t *dbp, /* caller's buffer */
701 xfs_dir2_put_t put) /* abi's formatting function */
702 {
703 int error; /* error return value */
704 int i; /* shortform entry number */
705 xfs_mount_t *mp; /* filesystem mount point */
706 xfs_dir2_dataptr_t off; /* current entry's offset */
707 xfs_dir2_put_args_t p; /* arg package for put rtn */
708 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
709 xfs_dir2_sf_t *sfp; /* shortform structure */
710 xfs_off_t dir_offset;
711
712 mp = dp->i_mount;
713
714 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
715 /*
716 * Give up if the directory is way too short.
717 */
718 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
719 ASSERT(XFS_FORCED_SHUTDOWN(mp));
720 return XFS_ERROR(EIO);
721 }
722
723 dir_offset = uio->uio_offset;
724
725 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
726 ASSERT(dp->i_df.if_u1.if_data != NULL);
727
728 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
729
730 ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count));
731
732 /*
733 * If the block number in the offset is out of range, we're done.
734 */
735 if (XFS_DIR2_DATAPTR_TO_DB(mp, dir_offset) > mp->m_dirdatablk) {
736 *eofp = 1;
737 return 0;
738 }
739
740 /*
741 * Set up putargs structure.
742 */
743 p.dbp = dbp;
744 p.put = put;
745 p.uio = uio;
746 /*
747 * Put . entry unless we're starting past it.
748 */
749 if (dir_offset <=
750 XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
751 XFS_DIR2_DATA_DOT_OFFSET)) {
752 p.cook = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, 0,
753 XFS_DIR2_DATA_DOTDOT_OFFSET);
754 p.ino = dp->i_ino;
755 #if XFS_BIG_INUMS
756 p.ino += mp->m_inoadd;
757 #endif
758 p.name = ".";
759 p.namelen = 1;
760
761 error = p.put(&p);
762
763 if (!p.done) {
764 uio->uio_offset =
765 XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
766 XFS_DIR2_DATA_DOT_OFFSET);
767 return error;
768 }
769 }
770
771 /*
772 * Put .. entry unless we're starting past it.
773 */
774 if (dir_offset <=
775 XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
776 XFS_DIR2_DATA_DOTDOT_OFFSET)) {
777 p.cook = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
778 XFS_DIR2_DATA_FIRST_OFFSET);
779 p.ino = XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent);
780 #if XFS_BIG_INUMS
781 p.ino += mp->m_inoadd;
782 #endif
783 p.name = "..";
784 p.namelen = 2;
785
786 error = p.put(&p);
787
788 if (!p.done) {
789 uio->uio_offset =
790 XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
791 XFS_DIR2_DATA_DOTDOT_OFFSET);
792 return error;
793 }
794 }
795
796 /*
797 * Loop while there are more entries and put'ing works.
798 */
799 for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
800 i < sfp->hdr.count;
801 i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) {
802
803 off = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
804 XFS_DIR2_SF_GET_OFFSET(sfep));
805
806 if (dir_offset > off)
807 continue;
808
809 p.namelen = sfep->namelen;
810
811 p.cook = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
812 XFS_DIR2_SF_GET_OFFSET(sfep) +
813 XFS_DIR2_DATA_ENTSIZE(p.namelen));
814
815 p.ino = XFS_DIR2_SF_GET_INUMBER(sfp, XFS_DIR2_SF_INUMBERP(sfep));
816 #if XFS_BIG_INUMS
817 p.ino += mp->m_inoadd;
818 #endif
819 p.name = (char *)sfep->name;
820
821 error = p.put(&p);
822
823 if (!p.done) {
824 uio->uio_offset = off;
825 return error;
826 }
827 }
828
829 /*
830 * They all fit.
831 */
832 *eofp = 1;
833
834 uio->uio_offset =
835 XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk + 1, 0);
836
837 return 0;
838 }
839
840 /*
841 * Lookup an entry in a shortform directory.
842 * Returns EEXIST if found, ENOENT if not found.
843 */
844 int /* error */
845 xfs_dir2_sf_lookup(
846 xfs_da_args_t *args) /* operation arguments */
847 {
848 xfs_inode_t *dp; /* incore directory inode */
849 int i; /* entry index */
850 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
851 xfs_dir2_sf_t *sfp; /* shortform structure */
852
853 xfs_dir2_trace_args("sf_lookup", args);
854 xfs_dir2_sf_check(args);
855 dp = args->dp;
856
857 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
858 /*
859 * Bail out if the directory is way too short.
860 */
861 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
862 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
863 return XFS_ERROR(EIO);
864 }
865 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
866 ASSERT(dp->i_df.if_u1.if_data != NULL);
867 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
868 ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count));
869 /*
870 * Special case for .
871 */
872 if (args->namelen == 1 && args->name[0] == '.') {
873 args->inumber = dp->i_ino;
874 return XFS_ERROR(EEXIST);
875 }
876 /*
877 * Special case for ..
878 */
879 if (args->namelen == 2 &&
880 args->name[0] == '.' && args->name[1] == '.') {
881 args->inumber = XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent);
882 return XFS_ERROR(EEXIST);
883 }
884 /*
885 * Loop over all the entries trying to match ours.
886 */
887 for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
888 i < sfp->hdr.count;
889 i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) {
890 if (sfep->namelen == args->namelen &&
891 sfep->name[0] == args->name[0] &&
892 memcmp(args->name, sfep->name, args->namelen) == 0) {
893 args->inumber =
894 XFS_DIR2_SF_GET_INUMBER(sfp,
895 XFS_DIR2_SF_INUMBERP(sfep));
896 return XFS_ERROR(EEXIST);
897 }
898 }
899 /*
900 * Didn't find it.
901 */
902 ASSERT(args->oknoent);
903 return XFS_ERROR(ENOENT);
904 }
905
906 /*
907 * Remove an entry from a shortform directory.
908 */
909 int /* error */
910 xfs_dir2_sf_removename(
911 xfs_da_args_t *args)
912 {
913 int byteoff; /* offset of removed entry */
914 xfs_inode_t *dp; /* incore directory inode */
915 int entsize; /* this entry's size */
916 int i; /* shortform entry index */
917 int newsize; /* new inode size */
918 int oldsize; /* old inode size */
919 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
920 xfs_dir2_sf_t *sfp; /* shortform structure */
921
922 xfs_dir2_trace_args("sf_removename", args);
923 dp = args->dp;
924
925 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
926 oldsize = (int)dp->i_d.di_size;
927 /*
928 * Bail out if the directory is way too short.
929 */
930 if (oldsize < offsetof(xfs_dir2_sf_hdr_t, parent)) {
931 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
932 return XFS_ERROR(EIO);
933 }
934 ASSERT(dp->i_df.if_bytes == oldsize);
935 ASSERT(dp->i_df.if_u1.if_data != NULL);
936 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
937 ASSERT(oldsize >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.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);
943 i < sfp->hdr.count;
944 i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) {
945 if (sfep->namelen == args->namelen &&
946 sfep->name[0] == args->name[0] &&
947 memcmp(sfep->name, args->name, args->namelen) == 0) {
948 ASSERT(XFS_DIR2_SF_GET_INUMBER(sfp,
949 XFS_DIR2_SF_INUMBERP(sfep)) ==
950 args->inumber);
951 break;
952 }
953 }
954 /*
955 * Didn't find it.
956 */
957 if (i == sfp->hdr.count) {
958 return XFS_ERROR(ENOENT);
959 }
960 /*
961 * Calculate sizes.
962 */
963 byteoff = (int)((char *)sfep - (char *)sfp);
964 entsize = XFS_DIR2_SF_ENTSIZE_BYNAME(sfp, args->namelen);
965 newsize = oldsize - entsize;
966 /*
967 * Copy the part if any after the removed entry, sliding it down.
968 */
969 if (byteoff + entsize < oldsize)
970 memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize,
971 oldsize - (byteoff + entsize));
972 /*
973 * Fix up the header and file size.
974 */
975 sfp->hdr.count--;
976 dp->i_d.di_size = newsize;
977 /*
978 * Reallocate, making it smaller.
979 */
980 xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
981 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
982 #if XFS_BIG_INUMS
983 /*
984 * Are we changing inode number size?
985 */
986 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
987 if (sfp->hdr.i8count == 1)
988 xfs_dir2_sf_toino4(args);
989 else
990 sfp->hdr.i8count--;
991 }
992 #endif
993 xfs_dir2_sf_check(args);
994 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
995 return 0;
996 }
997
998 /*
999 * Replace the inode number of an entry in a shortform directory.
1000 */
1001 int /* error */
1002 xfs_dir2_sf_replace(
1003 xfs_da_args_t *args) /* operation arguments */
1004 {
1005 xfs_inode_t *dp; /* incore directory inode */
1006 int i; /* entry index */
1007 #if XFS_BIG_INUMS || defined(DEBUG)
1008 xfs_ino_t ino=0; /* entry old inode number */
1009 #endif
1010 #if XFS_BIG_INUMS
1011 int i8elevated; /* sf_toino8 set i8count=1 */
1012 #endif
1013 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
1014 xfs_dir2_sf_t *sfp; /* shortform structure */
1015
1016 xfs_dir2_trace_args("sf_replace", args);
1017 dp = args->dp;
1018
1019 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
1020 /*
1021 * Bail out if the shortform directory is way too small.
1022 */
1023 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
1024 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
1025 return XFS_ERROR(EIO);
1026 }
1027 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
1028 ASSERT(dp->i_df.if_u1.if_data != NULL);
1029 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1030 ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count));
1031 #if XFS_BIG_INUMS
1032 /*
1033 * New inode number is large, and need to convert to 8-byte inodes.
1034 */
1035 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->hdr.i8count == 0) {
1036 int error; /* error return value */
1037 int newsize; /* new inode size */
1038
1039 newsize =
1040 dp->i_df.if_bytes +
1041 (sfp->hdr.count + 1) *
1042 ((uint)sizeof(xfs_dir2_ino8_t) -
1043 (uint)sizeof(xfs_dir2_ino4_t));
1044 /*
1045 * Won't fit as shortform, convert to block then do replace.
1046 */
1047 if (newsize > XFS_IFORK_DSIZE(dp)) {
1048 error = xfs_dir2_sf_to_block(args);
1049 if (error) {
1050 return error;
1051 }
1052 return xfs_dir2_block_replace(args);
1053 }
1054 /*
1055 * Still fits, convert to 8-byte now.
1056 */
1057 xfs_dir2_sf_toino8(args);
1058 i8elevated = 1;
1059 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1060 } else
1061 i8elevated = 0;
1062 #endif
1063 ASSERT(args->namelen != 1 || args->name[0] != '.');
1064 /*
1065 * Replace ..'s entry.
1066 */
1067 if (args->namelen == 2 &&
1068 args->name[0] == '.' && args->name[1] == '.') {
1069 #if XFS_BIG_INUMS || defined(DEBUG)
1070 ino = XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent);
1071 ASSERT(args->inumber != ino);
1072 #endif
1073 XFS_DIR2_SF_PUT_INUMBER(sfp, &args->inumber, &sfp->hdr.parent);
1074 }
1075 /*
1076 * Normal entry, look for the name.
1077 */
1078 else {
1079 for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
1080 i < sfp->hdr.count;
1081 i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep)) {
1082 if (sfep->namelen == args->namelen &&
1083 sfep->name[0] == args->name[0] &&
1084 memcmp(args->name, sfep->name, args->namelen) == 0) {
1085 #if XFS_BIG_INUMS || defined(DEBUG)
1086 ino = XFS_DIR2_SF_GET_INUMBER(sfp,
1087 XFS_DIR2_SF_INUMBERP(sfep));
1088 ASSERT(args->inumber != ino);
1089 #endif
1090 XFS_DIR2_SF_PUT_INUMBER(sfp, &args->inumber,
1091 XFS_DIR2_SF_INUMBERP(sfep));
1092 break;
1093 }
1094 }
1095 /*
1096 * Didn't find it.
1097 */
1098 if (i == sfp->hdr.count) {
1099 ASSERT(args->oknoent);
1100 #if XFS_BIG_INUMS
1101 if (i8elevated)
1102 xfs_dir2_sf_toino4(args);
1103 #endif
1104 return XFS_ERROR(ENOENT);
1105 }
1106 }
1107 #if XFS_BIG_INUMS
1108 /*
1109 * See if the old number was large, the new number is small.
1110 */
1111 if (ino > XFS_DIR2_MAX_SHORT_INUM &&
1112 args->inumber <= XFS_DIR2_MAX_SHORT_INUM) {
1113 /*
1114 * And the old count was one, so need to convert to small.
1115 */
1116 if (sfp->hdr.i8count == 1)
1117 xfs_dir2_sf_toino4(args);
1118 else
1119 sfp->hdr.i8count--;
1120 }
1121 /*
1122 * See if the old number was small, the new number is large.
1123 */
1124 if (ino <= XFS_DIR2_MAX_SHORT_INUM &&
1125 args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
1126 /*
1127 * add to the i8count unless we just converted to 8-byte
1128 * inodes (which does an implied i8count = 1)
1129 */
1130 ASSERT(sfp->hdr.i8count != 0);
1131 if (!i8elevated)
1132 sfp->hdr.i8count++;
1133 }
1134 #endif
1135 xfs_dir2_sf_check(args);
1136 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
1137 return 0;
1138 }
1139
1140 #if XFS_BIG_INUMS
1141 /*
1142 * Convert from 8-byte inode numbers to 4-byte inode numbers.
1143 * The last 8-byte inode number is gone, but the count is still 1.
1144 */
1145 static void
1146 xfs_dir2_sf_toino4(
1147 xfs_da_args_t *args) /* operation arguments */
1148 {
1149 char *buf; /* old dir's buffer */
1150 xfs_inode_t *dp; /* incore directory inode */
1151 int i; /* entry index */
1152 xfs_ino_t ino; /* entry inode number */
1153 int newsize; /* new inode size */
1154 xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */
1155 xfs_dir2_sf_t *oldsfp; /* old sf directory */
1156 int oldsize; /* old inode size */
1157 xfs_dir2_sf_entry_t *sfep; /* new sf entry */
1158 xfs_dir2_sf_t *sfp; /* new sf directory */
1159
1160 xfs_dir2_trace_args("sf_toino4", args);
1161 dp = args->dp;
1162
1163 /*
1164 * Copy the old directory to the buffer.
1165 * Then nuke it from the inode, and add the new buffer to the inode.
1166 * Don't want xfs_idata_realloc copying the data here.
1167 */
1168 oldsize = dp->i_df.if_bytes;
1169 buf = kmem_alloc(oldsize, KM_SLEEP);
1170 oldsfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1171 ASSERT(oldsfp->hdr.i8count == 1);
1172 memcpy(buf, oldsfp, oldsize);
1173 /*
1174 * Compute the new inode size.
1175 */
1176 newsize =
1177 oldsize -
1178 (oldsfp->hdr.count + 1) *
1179 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
1180 xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1181 xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1182 /*
1183 * Reset our pointers, the data has moved.
1184 */
1185 oldsfp = (xfs_dir2_sf_t *)buf;
1186 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1187 /*
1188 * Fill in the new header.
1189 */
1190 sfp->hdr.count = oldsfp->hdr.count;
1191 sfp->hdr.i8count = 0;
1192 ino = XFS_DIR2_SF_GET_INUMBER(oldsfp, &oldsfp->hdr.parent);
1193 XFS_DIR2_SF_PUT_INUMBER(sfp, &ino, &sfp->hdr.parent);
1194 /*
1195 * Copy the entries field by field.
1196 */
1197 for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp),
1198 oldsfep = XFS_DIR2_SF_FIRSTENTRY(oldsfp);
1199 i < sfp->hdr.count;
1200 i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep),
1201 oldsfep = XFS_DIR2_SF_NEXTENTRY(oldsfp, oldsfep)) {
1202 sfep->namelen = oldsfep->namelen;
1203 sfep->offset = oldsfep->offset;
1204 memcpy(sfep->name, oldsfep->name, sfep->namelen);
1205 ino = XFS_DIR2_SF_GET_INUMBER(oldsfp,
1206 XFS_DIR2_SF_INUMBERP(oldsfep));
1207 XFS_DIR2_SF_PUT_INUMBER(sfp, &ino, XFS_DIR2_SF_INUMBERP(sfep));
1208 }
1209 /*
1210 * Clean up the inode.
1211 */
1212 kmem_free(buf, oldsize);
1213 dp->i_d.di_size = newsize;
1214 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1215 }
1216
1217 /*
1218 * Convert from 4-byte inode numbers to 8-byte inode numbers.
1219 * The new 8-byte inode number is not there yet, we leave with the
1220 * count 1 but no corresponding entry.
1221 */
1222 static void
1223 xfs_dir2_sf_toino8(
1224 xfs_da_args_t *args) /* operation arguments */
1225 {
1226 char *buf; /* old dir's buffer */
1227 xfs_inode_t *dp; /* incore directory inode */
1228 int i; /* entry index */
1229 xfs_ino_t ino; /* entry inode number */
1230 int newsize; /* new inode size */
1231 xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */
1232 xfs_dir2_sf_t *oldsfp; /* old sf directory */
1233 int oldsize; /* old inode size */
1234 xfs_dir2_sf_entry_t *sfep; /* new sf entry */
1235 xfs_dir2_sf_t *sfp; /* new sf directory */
1236
1237 xfs_dir2_trace_args("sf_toino8", args);
1238 dp = args->dp;
1239
1240 /*
1241 * Copy the old directory to the buffer.
1242 * Then nuke it from the inode, and add the new buffer to the inode.
1243 * Don't want xfs_idata_realloc copying the data here.
1244 */
1245 oldsize = dp->i_df.if_bytes;
1246 buf = kmem_alloc(oldsize, KM_SLEEP);
1247 oldsfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1248 ASSERT(oldsfp->hdr.i8count == 0);
1249 memcpy(buf, oldsfp, oldsize);
1250 /*
1251 * Compute the new inode size.
1252 */
1253 newsize =
1254 oldsize +
1255 (oldsfp->hdr.count + 1) *
1256 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
1257 xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1258 xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1259 /*
1260 * Reset our pointers, the data has moved.
1261 */
1262 oldsfp = (xfs_dir2_sf_t *)buf;
1263 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1264 /*
1265 * Fill in the new header.
1266 */
1267 sfp->hdr.count = oldsfp->hdr.count;
1268 sfp->hdr.i8count = 1;
1269 ino = XFS_DIR2_SF_GET_INUMBER(oldsfp, &oldsfp->hdr.parent);
1270 XFS_DIR2_SF_PUT_INUMBER(sfp, &ino, &sfp->hdr.parent);
1271 /*
1272 * Copy the entries field by field.
1273 */
1274 for (i = 0, sfep = XFS_DIR2_SF_FIRSTENTRY(sfp),
1275 oldsfep = XFS_DIR2_SF_FIRSTENTRY(oldsfp);
1276 i < sfp->hdr.count;
1277 i++, sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep),
1278 oldsfep = XFS_DIR2_SF_NEXTENTRY(oldsfp, oldsfep)) {
1279 sfep->namelen = oldsfep->namelen;
1280 sfep->offset = oldsfep->offset;
1281 memcpy(sfep->name, oldsfep->name, sfep->namelen);
1282 ino = XFS_DIR2_SF_GET_INUMBER(oldsfp,
1283 XFS_DIR2_SF_INUMBERP(oldsfep));
1284 XFS_DIR2_SF_PUT_INUMBER(sfp, &ino, XFS_DIR2_SF_INUMBERP(sfep));
1285 }
1286 /*
1287 * Clean up the inode.
1288 */
1289 kmem_free(buf, oldsize);
1290 dp->i_d.di_size = newsize;
1291 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1292 }
1293 #endif /* XFS_BIG_INUMS */
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