2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
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.
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.
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
20 #include "xfs_types.h"
23 #include "xfs_trans.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_trace.h"
42 * Prototypes for internal functions.
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,
48 static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange,
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);
54 static void xfs_dir2_sf_check(xfs_da_args_t *args);
56 #define xfs_dir2_sf_check(args)
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 */
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).
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 */
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 */
91 count = i8count = namelen = 0;
92 btp = xfs_dir2_block_tail_p(mp, block);
93 blp = xfs_dir2_block_leaf_p(btp);
96 * Iterate over the block's data entries by using the leaf pointers.
98 for (i = 0; i < be32_to_cpu(btp->count); i++) {
99 if ((addr = be32_to_cpu(blp[i].address)) == XFS_DIR2_NULL_DATAPTR)
102 * Calculate the pointer to the entry at hand.
104 dep = (xfs_dir2_data_entry_t *)
105 ((char *)block + xfs_dir2_dataptr_to_off(mp, addr));
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.
111 isdot = dep->namelen == 1 && dep->name[0] == '.';
114 dep->name[0] == '.' && dep->name[1] == '.';
117 i8count += be64_to_cpu(dep->inumber) > XFS_DIR2_MAX_SHORT_INUM;
119 if (!isdot && !isdotdot) {
121 namelen += dep->namelen;
123 parent = be64_to_cpu(dep->inumber);
125 * Calculate the new size, see if we should give up yet.
127 size = xfs_dir2_sf_hdr_size(i8count) + /* header */
128 count + /* namelen */
129 count * (uint)sizeof(xfs_dir2_sf_off_t) + /* offset */
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 */
138 * Create the output header, if it worked.
141 sfhp->i8count = i8count;
142 xfs_dir2_sf_put_inumber((xfs_dir2_sf_t *)sfhp, &parent, &sfhp->parent);
147 * Convert a block format directory to shortform.
148 * Caller has already checked that it will fit, and built us a header.
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 */
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 */
171 trace_xfs_dir2_block_to_sf(args);
177 * Make a copy of the block data, so we can shrink the inode
178 * and add local data.
180 block = kmem_alloc(mp->m_dirblksize, KM_SLEEP);
181 memcpy(block, bp->data, mp->m_dirblksize);
182 logflags = XFS_ILOG_CORE;
183 if ((error = xfs_dir2_shrink_inode(args, mp->m_dirdatablk, bp))) {
184 ASSERT(error != ENOSPC);
188 * The buffer is now unconditionally gone, whether
189 * xfs_dir2_shrink_inode worked or not.
191 * Convert the inode to local format.
193 dp->i_df.if_flags &= ~XFS_IFEXTENTS;
194 dp->i_df.if_flags |= XFS_IFINLINE;
195 dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
196 ASSERT(dp->i_df.if_bytes == 0);
197 xfs_idata_realloc(dp, size, XFS_DATA_FORK);
198 logflags |= XFS_ILOG_DDATA;
200 * Copy the header into the newly allocate local space.
202 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
203 memcpy(sfp, sfhp, xfs_dir2_sf_hdr_size(sfhp->i8count));
204 dp->i_d.di_size = size;
206 * Set up to loop over the block's entries.
208 btp = xfs_dir2_block_tail_p(mp, block);
209 ptr = (char *)block->u;
210 endptr = (char *)xfs_dir2_block_leaf_p(btp);
211 sfep = xfs_dir2_sf_firstentry(sfp);
213 * Loop over the active and unused entries.
214 * Stop when we reach the leaf/tail portion of the block.
216 while (ptr < endptr) {
218 * If it's unused, just skip over it.
220 dup = (xfs_dir2_data_unused_t *)ptr;
221 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
222 ptr += be16_to_cpu(dup->length);
225 dep = (xfs_dir2_data_entry_t *)ptr;
229 if (dep->namelen == 1 && dep->name[0] == '.')
230 ASSERT(be64_to_cpu(dep->inumber) == dp->i_ino);
232 * Skip .., but make sure the inode number is right.
234 else if (dep->namelen == 2 &&
235 dep->name[0] == '.' && dep->name[1] == '.')
236 ASSERT(be64_to_cpu(dep->inumber) ==
237 xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent));
239 * Normal entry, copy it into shortform.
242 sfep->namelen = dep->namelen;
243 xfs_dir2_sf_put_offset(sfep,
244 (xfs_dir2_data_aoff_t)
245 ((char *)dep - (char *)block));
246 memcpy(sfep->name, dep->name, dep->namelen);
247 temp = be64_to_cpu(dep->inumber);
248 xfs_dir2_sf_put_inumber(sfp, &temp,
249 xfs_dir2_sf_inumberp(sfep));
250 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
252 ptr += xfs_dir2_data_entsize(dep->namelen);
254 ASSERT((char *)sfep - (char *)sfp == size);
255 xfs_dir2_sf_check(args);
257 xfs_trans_log_inode(args->trans, dp, logflags);
263 * Add a name to a shortform directory.
264 * There are two algorithms, "easy" and "hard" which we decide on
265 * before changing anything.
266 * Convert to block form if necessary, if the new entry won't fit.
270 xfs_da_args_t *args) /* operation arguments */
272 int add_entsize; /* size of the new entry */
273 xfs_inode_t *dp; /* incore directory inode */
274 int error; /* error return value */
275 int incr_isize; /* total change in size */
276 int new_isize; /* di_size after adding name */
277 int objchange; /* changing to 8-byte inodes */
278 xfs_dir2_data_aoff_t offset = 0; /* offset for new entry */
279 int old_isize; /* di_size before adding name */
280 int pick; /* which algorithm to use */
281 xfs_dir2_sf_t *sfp; /* shortform structure */
282 xfs_dir2_sf_entry_t *sfep = NULL; /* shortform entry */
284 trace_xfs_dir2_sf_addname(args);
286 ASSERT(xfs_dir2_sf_lookup(args) == ENOENT);
288 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
290 * Make sure the shortform value has some of its header.
292 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
293 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
294 return XFS_ERROR(EIO);
296 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
297 ASSERT(dp->i_df.if_u1.if_data != NULL);
298 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
299 ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
301 * Compute entry (and change in) size.
303 add_entsize = xfs_dir2_sf_entsize_byname(sfp, args->namelen);
304 incr_isize = add_entsize;
308 * Do we have to change to 8 byte inodes?
310 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->hdr.i8count == 0) {
312 * Yes, adjust the entry size and the total size.
315 (uint)sizeof(xfs_dir2_ino8_t) -
316 (uint)sizeof(xfs_dir2_ino4_t);
318 (sfp->hdr.count + 2) *
319 ((uint)sizeof(xfs_dir2_ino8_t) -
320 (uint)sizeof(xfs_dir2_ino4_t));
324 old_isize = (int)dp->i_d.di_size;
325 new_isize = old_isize + incr_isize;
327 * Won't fit as shortform any more (due to size),
328 * or the pick routine says it won't (due to offset values).
330 if (new_isize > XFS_IFORK_DSIZE(dp) ||
332 xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) {
334 * Just checking or no space reservation, it doesn't fit.
336 if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0)
337 return XFS_ERROR(ENOSPC);
339 * Convert to block form then add the name.
341 error = xfs_dir2_sf_to_block(args);
344 return xfs_dir2_block_addname(args);
347 * Just checking, it fits.
349 if (args->op_flags & XFS_DA_OP_JUSTCHECK)
352 * Do it the easy way - just add it at the end.
355 xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize);
357 * Do it the hard way - look for a place to insert the new entry.
358 * Convert to 8 byte inode numbers first if necessary.
364 xfs_dir2_sf_toino8(args);
366 xfs_dir2_sf_addname_hard(args, objchange, new_isize);
368 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
373 * Add the new entry the "easy" way.
374 * This is copying the old directory and adding the new entry at the end.
375 * Since it's sorted by "offset" we need room after the last offset
376 * that's already there, and then room to convert to a block directory.
377 * This is already checked by the pick routine.
380 xfs_dir2_sf_addname_easy(
381 xfs_da_args_t *args, /* operation arguments */
382 xfs_dir2_sf_entry_t *sfep, /* pointer to new entry */
383 xfs_dir2_data_aoff_t offset, /* offset to use for new ent */
384 int new_isize) /* new directory size */
386 int byteoff; /* byte offset in sf dir */
387 xfs_inode_t *dp; /* incore directory inode */
388 xfs_dir2_sf_t *sfp; /* shortform structure */
392 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
393 byteoff = (int)((char *)sfep - (char *)sfp);
395 * Grow the in-inode space.
397 xfs_idata_realloc(dp, xfs_dir2_sf_entsize_byname(sfp, args->namelen),
400 * Need to set up again due to realloc of the inode data.
402 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
403 sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + byteoff);
405 * Fill in the new entry.
407 sfep->namelen = args->namelen;
408 xfs_dir2_sf_put_offset(sfep, offset);
409 memcpy(sfep->name, args->name, sfep->namelen);
410 xfs_dir2_sf_put_inumber(sfp, &args->inumber,
411 xfs_dir2_sf_inumberp(sfep));
413 * Update the header and inode.
417 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM)
420 dp->i_d.di_size = new_isize;
421 xfs_dir2_sf_check(args);
425 * Add the new entry the "hard" way.
426 * The caller has already converted to 8 byte inode numbers if necessary,
427 * in which case we need to leave the i8count at 1.
428 * Find a hole that the new entry will fit into, and copy
429 * the first part of the entries, the new entry, and the last part of
434 xfs_dir2_sf_addname_hard(
435 xfs_da_args_t *args, /* operation arguments */
436 int objchange, /* changing inode number size */
437 int new_isize) /* new directory size */
439 int add_datasize; /* data size need for new ent */
440 char *buf; /* buffer for old */
441 xfs_inode_t *dp; /* incore directory inode */
442 int eof; /* reached end of old dir */
443 int nbytes; /* temp for byte copies */
444 xfs_dir2_data_aoff_t new_offset; /* next offset value */
445 xfs_dir2_data_aoff_t offset; /* current offset value */
446 int old_isize; /* previous di_size */
447 xfs_dir2_sf_entry_t *oldsfep; /* entry in original dir */
448 xfs_dir2_sf_t *oldsfp; /* original shortform dir */
449 xfs_dir2_sf_entry_t *sfep; /* entry in new dir */
450 xfs_dir2_sf_t *sfp; /* new shortform dir */
453 * Copy the old directory to the stack buffer.
457 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
458 old_isize = (int)dp->i_d.di_size;
459 buf = kmem_alloc(old_isize, KM_SLEEP);
460 oldsfp = (xfs_dir2_sf_t *)buf;
461 memcpy(oldsfp, sfp, old_isize);
463 * Loop over the old directory finding the place we're going
464 * to insert the new entry.
465 * If it's going to end up at the end then oldsfep will point there.
467 for (offset = XFS_DIR2_DATA_FIRST_OFFSET,
468 oldsfep = xfs_dir2_sf_firstentry(oldsfp),
469 add_datasize = xfs_dir2_data_entsize(args->namelen),
470 eof = (char *)oldsfep == &buf[old_isize];
472 offset = new_offset + xfs_dir2_data_entsize(oldsfep->namelen),
473 oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep),
474 eof = (char *)oldsfep == &buf[old_isize]) {
475 new_offset = xfs_dir2_sf_get_offset(oldsfep);
476 if (offset + add_datasize <= new_offset)
480 * Get rid of the old directory, then allocate space for
481 * the new one. We do this so xfs_idata_realloc won't copy
484 xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK);
485 xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK);
487 * Reset the pointer since the buffer was reallocated.
489 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
491 * Copy the first part of the directory, including the header.
493 nbytes = (int)((char *)oldsfep - (char *)oldsfp);
494 memcpy(sfp, oldsfp, nbytes);
495 sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes);
497 * Fill in the new entry, and update the header counts.
499 sfep->namelen = args->namelen;
500 xfs_dir2_sf_put_offset(sfep, offset);
501 memcpy(sfep->name, args->name, sfep->namelen);
502 xfs_dir2_sf_put_inumber(sfp, &args->inumber,
503 xfs_dir2_sf_inumberp(sfep));
506 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange)
510 * If there's more left to copy, do that.
513 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
514 memcpy(sfep, oldsfep, old_isize - nbytes);
517 dp->i_d.di_size = new_isize;
518 xfs_dir2_sf_check(args);
522 * Decide if the new entry will fit at all.
523 * If it will fit, pick between adding the new entry to the end (easy)
524 * or somewhere else (hard).
525 * Return 0 (won't fit), 1 (easy), 2 (hard).
528 static int /* pick result */
529 xfs_dir2_sf_addname_pick(
530 xfs_da_args_t *args, /* operation arguments */
531 int objchange, /* inode # size changes */
532 xfs_dir2_sf_entry_t **sfepp, /* out(1): new entry ptr */
533 xfs_dir2_data_aoff_t *offsetp) /* out(1): new offset */
535 xfs_inode_t *dp; /* incore directory inode */
536 int holefit; /* found hole it will fit in */
537 int i; /* entry number */
538 xfs_mount_t *mp; /* filesystem mount point */
539 xfs_dir2_data_aoff_t offset; /* data block offset */
540 xfs_dir2_sf_entry_t *sfep; /* shortform entry */
541 xfs_dir2_sf_t *sfp; /* shortform structure */
542 int size; /* entry's data size */
543 int used; /* data bytes used */
548 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
549 size = xfs_dir2_data_entsize(args->namelen);
550 offset = XFS_DIR2_DATA_FIRST_OFFSET;
551 sfep = xfs_dir2_sf_firstentry(sfp);
554 * Loop over sf entries.
555 * Keep track of data offset and whether we've seen a place
556 * to insert the new entry.
558 for (i = 0; i < sfp->hdr.count; i++) {
560 holefit = offset + size <= xfs_dir2_sf_get_offset(sfep);
561 offset = xfs_dir2_sf_get_offset(sfep) +
562 xfs_dir2_data_entsize(sfep->namelen);
563 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
566 * Calculate data bytes used excluding the new entry, if this
567 * was a data block (block form directory).
570 (sfp->hdr.count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
571 (uint)sizeof(xfs_dir2_block_tail_t);
573 * If it won't fit in a block form then we can't insert it,
574 * we'll go back, convert to block, then try the insert and convert
577 if (used + (holefit ? 0 : size) > mp->m_dirblksize)
580 * If changing the inode number size, do it the hard way.
587 ASSERT(objchange == 0);
590 * If it won't fit at the end then do it the hard way (use the hole).
592 if (used + size > mp->m_dirblksize)
595 * Do it the easy way.
604 * Check consistency of shortform directory, assert if bad.
608 xfs_da_args_t *args) /* operation arguments */
610 xfs_inode_t *dp; /* incore directory inode */
611 int i; /* entry number */
612 int i8count; /* number of big inode#s */
613 xfs_ino_t ino; /* entry inode number */
614 int offset; /* data offset */
615 xfs_dir2_sf_entry_t *sfep; /* shortform dir entry */
616 xfs_dir2_sf_t *sfp; /* shortform structure */
620 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
621 offset = XFS_DIR2_DATA_FIRST_OFFSET;
622 ino = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);
623 i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
625 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
627 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
628 ASSERT(xfs_dir2_sf_get_offset(sfep) >= offset);
629 ino = xfs_dir2_sf_get_inumber(sfp, xfs_dir2_sf_inumberp(sfep));
630 i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
632 xfs_dir2_sf_get_offset(sfep) +
633 xfs_dir2_data_entsize(sfep->namelen);
635 ASSERT(i8count == sfp->hdr.i8count);
636 ASSERT(XFS_BIG_INUMS || i8count == 0);
637 ASSERT((char *)sfep - (char *)sfp == dp->i_d.di_size);
639 (sfp->hdr.count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
640 (uint)sizeof(xfs_dir2_block_tail_t) <=
641 dp->i_mount->m_dirblksize);
646 * Create a new (shortform) directory.
648 int /* error, always 0 */
650 xfs_da_args_t *args, /* operation arguments */
651 xfs_ino_t pino) /* parent inode number */
653 xfs_inode_t *dp; /* incore directory inode */
654 int i8count; /* parent inode is an 8-byte number */
655 xfs_dir2_sf_t *sfp; /* shortform structure */
656 int size; /* directory size */
658 trace_xfs_dir2_sf_create(args);
663 ASSERT(dp->i_d.di_size == 0);
665 * If it's currently a zero-length extent file,
666 * convert it to local format.
668 if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) {
669 dp->i_df.if_flags &= ~XFS_IFEXTENTS; /* just in case */
670 dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
671 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
672 dp->i_df.if_flags |= XFS_IFINLINE;
674 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
675 ASSERT(dp->i_df.if_bytes == 0);
676 i8count = pino > XFS_DIR2_MAX_SHORT_INUM;
677 size = xfs_dir2_sf_hdr_size(i8count);
679 * Make a buffer for the data.
681 xfs_idata_realloc(dp, size, XFS_DATA_FORK);
683 * Fill in the header,
685 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
686 sfp->hdr.i8count = i8count;
688 * Now can put in the inode number, since i8count is set.
690 xfs_dir2_sf_put_inumber(sfp, &pino, &sfp->hdr.parent);
692 dp->i_d.di_size = size;
693 xfs_dir2_sf_check(args);
694 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
699 xfs_dir2_sf_getdents(
700 xfs_inode_t *dp, /* incore directory inode */
705 int i; /* shortform entry number */
706 xfs_mount_t *mp; /* filesystem mount point */
707 xfs_dir2_dataptr_t off; /* current entry's offset */
708 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
709 xfs_dir2_sf_t *sfp; /* shortform structure */
710 xfs_dir2_dataptr_t dot_offset;
711 xfs_dir2_dataptr_t dotdot_offset;
716 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
718 * Give up if the directory is way too short.
720 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
721 ASSERT(XFS_FORCED_SHUTDOWN(mp));
722 return XFS_ERROR(EIO);
725 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
726 ASSERT(dp->i_df.if_u1.if_data != NULL);
728 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
730 ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
733 * If the block number in the offset is out of range, we're done.
735 if (xfs_dir2_dataptr_to_db(mp, *offset) > mp->m_dirdatablk)
739 * Precalculate offsets for . and .. as we will always need them.
741 * XXX(hch): the second argument is sometimes 0 and sometimes
744 dot_offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
745 XFS_DIR2_DATA_DOT_OFFSET);
746 dotdot_offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
747 XFS_DIR2_DATA_DOTDOT_OFFSET);
750 * Put . entry unless we're starting past it.
752 if (*offset <= dot_offset) {
753 if (filldir(dirent, ".", 1, dot_offset & 0x7fffffff, dp->i_ino, DT_DIR)) {
754 *offset = dot_offset & 0x7fffffff;
760 * Put .. entry unless we're starting past it.
762 if (*offset <= dotdot_offset) {
763 ino = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);
764 if (filldir(dirent, "..", 2, dotdot_offset & 0x7fffffff, ino, DT_DIR)) {
765 *offset = dotdot_offset & 0x7fffffff;
771 * Loop while there are more entries and put'ing works.
773 sfep = xfs_dir2_sf_firstentry(sfp);
774 for (i = 0; i < sfp->hdr.count; i++) {
775 off = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
776 xfs_dir2_sf_get_offset(sfep));
779 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
783 ino = xfs_dir2_sf_get_inumber(sfp, xfs_dir2_sf_inumberp(sfep));
784 if (filldir(dirent, (char *)sfep->name, sfep->namelen,
785 off & 0x7fffffff, ino, DT_UNKNOWN)) {
786 *offset = off & 0x7fffffff;
789 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
792 *offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk + 1, 0) &
798 * Lookup an entry in a shortform directory.
799 * Returns EEXIST if found, ENOENT if not found.
803 xfs_da_args_t *args) /* operation arguments */
805 xfs_inode_t *dp; /* incore directory inode */
806 int i; /* entry index */
808 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
809 xfs_dir2_sf_t *sfp; /* shortform structure */
810 enum xfs_dacmp cmp; /* comparison result */
811 xfs_dir2_sf_entry_t *ci_sfep; /* case-insens. entry */
813 trace_xfs_dir2_sf_lookup(args);
815 xfs_dir2_sf_check(args);
818 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
820 * Bail out if the directory is way too short.
822 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
823 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
824 return XFS_ERROR(EIO);
826 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
827 ASSERT(dp->i_df.if_u1.if_data != NULL);
828 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
829 ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
833 if (args->namelen == 1 && args->name[0] == '.') {
834 args->inumber = dp->i_ino;
835 args->cmpresult = XFS_CMP_EXACT;
836 return XFS_ERROR(EEXIST);
839 * Special case for ..
841 if (args->namelen == 2 &&
842 args->name[0] == '.' && args->name[1] == '.') {
843 args->inumber = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);
844 args->cmpresult = XFS_CMP_EXACT;
845 return XFS_ERROR(EEXIST);
848 * Loop over all the entries trying to match ours.
851 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->hdr.count;
852 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
854 * Compare name and if it's an exact match, return the inode
855 * number. If it's the first case-insensitive match, store the
856 * inode number and continue looking for an exact match.
858 cmp = dp->i_mount->m_dirnameops->compname(args, sfep->name,
860 if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
861 args->cmpresult = cmp;
862 args->inumber = xfs_dir2_sf_get_inumber(sfp,
863 xfs_dir2_sf_inumberp(sfep));
864 if (cmp == XFS_CMP_EXACT)
865 return XFS_ERROR(EEXIST);
869 ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
871 * Here, we can only be doing a lookup (not a rename or replace).
872 * If a case-insensitive match was not found, return ENOENT.
875 return XFS_ERROR(ENOENT);
876 /* otherwise process the CI match as required by the caller */
877 error = xfs_dir_cilookup_result(args, ci_sfep->name, ci_sfep->namelen);
878 return XFS_ERROR(error);
882 * Remove an entry from a shortform directory.
885 xfs_dir2_sf_removename(
888 int byteoff; /* offset of removed entry */
889 xfs_inode_t *dp; /* incore directory inode */
890 int entsize; /* this entry's size */
891 int i; /* shortform entry index */
892 int newsize; /* new inode size */
893 int oldsize; /* old inode size */
894 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
895 xfs_dir2_sf_t *sfp; /* shortform structure */
897 trace_xfs_dir2_sf_removename(args);
901 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
902 oldsize = (int)dp->i_d.di_size;
904 * Bail out if the directory is way too short.
906 if (oldsize < offsetof(xfs_dir2_sf_hdr_t, parent)) {
907 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
908 return XFS_ERROR(EIO);
910 ASSERT(dp->i_df.if_bytes == oldsize);
911 ASSERT(dp->i_df.if_u1.if_data != NULL);
912 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
913 ASSERT(oldsize >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
915 * Loop over the old directory entries.
916 * Find the one we're deleting.
918 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->hdr.count;
919 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
920 if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
922 ASSERT(xfs_dir2_sf_get_inumber(sfp,
923 xfs_dir2_sf_inumberp(sfep)) ==
931 if (i == sfp->hdr.count)
932 return XFS_ERROR(ENOENT);
936 byteoff = (int)((char *)sfep - (char *)sfp);
937 entsize = xfs_dir2_sf_entsize_byname(sfp, args->namelen);
938 newsize = oldsize - entsize;
940 * Copy the part if any after the removed entry, sliding it down.
942 if (byteoff + entsize < oldsize)
943 memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize,
944 oldsize - (byteoff + entsize));
946 * Fix up the header and file size.
949 dp->i_d.di_size = newsize;
951 * Reallocate, making it smaller.
953 xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
954 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
957 * Are we changing inode number size?
959 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
960 if (sfp->hdr.i8count == 1)
961 xfs_dir2_sf_toino4(args);
966 xfs_dir2_sf_check(args);
967 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
972 * Replace the inode number of an entry in a shortform directory.
976 xfs_da_args_t *args) /* operation arguments */
978 xfs_inode_t *dp; /* incore directory inode */
979 int i; /* entry index */
980 #if XFS_BIG_INUMS || defined(DEBUG)
981 xfs_ino_t ino=0; /* entry old inode number */
984 int i8elevated; /* sf_toino8 set i8count=1 */
986 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
987 xfs_dir2_sf_t *sfp; /* shortform structure */
989 trace_xfs_dir2_sf_replace(args);
993 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
995 * Bail out if the shortform directory is way too small.
997 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
998 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
999 return XFS_ERROR(EIO);
1001 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
1002 ASSERT(dp->i_df.if_u1.if_data != NULL);
1003 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1004 ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
1007 * New inode number is large, and need to convert to 8-byte inodes.
1009 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->hdr.i8count == 0) {
1010 int error; /* error return value */
1011 int newsize; /* new inode size */
1015 (sfp->hdr.count + 1) *
1016 ((uint)sizeof(xfs_dir2_ino8_t) -
1017 (uint)sizeof(xfs_dir2_ino4_t));
1019 * Won't fit as shortform, convert to block then do replace.
1021 if (newsize > XFS_IFORK_DSIZE(dp)) {
1022 error = xfs_dir2_sf_to_block(args);
1026 return xfs_dir2_block_replace(args);
1029 * Still fits, convert to 8-byte now.
1031 xfs_dir2_sf_toino8(args);
1033 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1037 ASSERT(args->namelen != 1 || args->name[0] != '.');
1039 * Replace ..'s entry.
1041 if (args->namelen == 2 &&
1042 args->name[0] == '.' && args->name[1] == '.') {
1043 #if XFS_BIG_INUMS || defined(DEBUG)
1044 ino = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);
1045 ASSERT(args->inumber != ino);
1047 xfs_dir2_sf_put_inumber(sfp, &args->inumber, &sfp->hdr.parent);
1050 * Normal entry, look for the name.
1053 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
1055 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
1056 if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
1058 #if XFS_BIG_INUMS || defined(DEBUG)
1059 ino = xfs_dir2_sf_get_inumber(sfp,
1060 xfs_dir2_sf_inumberp(sfep));
1061 ASSERT(args->inumber != ino);
1063 xfs_dir2_sf_put_inumber(sfp, &args->inumber,
1064 xfs_dir2_sf_inumberp(sfep));
1071 if (i == sfp->hdr.count) {
1072 ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
1075 xfs_dir2_sf_toino4(args);
1077 return XFS_ERROR(ENOENT);
1082 * See if the old number was large, the new number is small.
1084 if (ino > XFS_DIR2_MAX_SHORT_INUM &&
1085 args->inumber <= XFS_DIR2_MAX_SHORT_INUM) {
1087 * And the old count was one, so need to convert to small.
1089 if (sfp->hdr.i8count == 1)
1090 xfs_dir2_sf_toino4(args);
1095 * See if the old number was small, the new number is large.
1097 if (ino <= XFS_DIR2_MAX_SHORT_INUM &&
1098 args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
1100 * add to the i8count unless we just converted to 8-byte
1101 * inodes (which does an implied i8count = 1)
1103 ASSERT(sfp->hdr.i8count != 0);
1108 xfs_dir2_sf_check(args);
1109 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
1115 * Convert from 8-byte inode numbers to 4-byte inode numbers.
1116 * The last 8-byte inode number is gone, but the count is still 1.
1120 xfs_da_args_t *args) /* operation arguments */
1122 char *buf; /* old dir's buffer */
1123 xfs_inode_t *dp; /* incore directory inode */
1124 int i; /* entry index */
1125 xfs_ino_t ino; /* entry inode number */
1126 int newsize; /* new inode size */
1127 xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */
1128 xfs_dir2_sf_t *oldsfp; /* old sf directory */
1129 int oldsize; /* old inode size */
1130 xfs_dir2_sf_entry_t *sfep; /* new sf entry */
1131 xfs_dir2_sf_t *sfp; /* new sf directory */
1133 trace_xfs_dir2_sf_toino4(args);
1138 * Copy the old directory to the buffer.
1139 * Then nuke it from the inode, and add the new buffer to the inode.
1140 * Don't want xfs_idata_realloc copying the data here.
1142 oldsize = dp->i_df.if_bytes;
1143 buf = kmem_alloc(oldsize, KM_SLEEP);
1144 oldsfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1145 ASSERT(oldsfp->hdr.i8count == 1);
1146 memcpy(buf, oldsfp, oldsize);
1148 * Compute the new inode size.
1152 (oldsfp->hdr.count + 1) *
1153 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
1154 xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1155 xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1157 * Reset our pointers, the data has moved.
1159 oldsfp = (xfs_dir2_sf_t *)buf;
1160 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1162 * Fill in the new header.
1164 sfp->hdr.count = oldsfp->hdr.count;
1165 sfp->hdr.i8count = 0;
1166 ino = xfs_dir2_sf_get_inumber(oldsfp, &oldsfp->hdr.parent);
1167 xfs_dir2_sf_put_inumber(sfp, &ino, &sfp->hdr.parent);
1169 * Copy the entries field by field.
1171 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1172 oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1174 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep),
1175 oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep)) {
1176 sfep->namelen = oldsfep->namelen;
1177 sfep->offset = oldsfep->offset;
1178 memcpy(sfep->name, oldsfep->name, sfep->namelen);
1179 ino = xfs_dir2_sf_get_inumber(oldsfp,
1180 xfs_dir2_sf_inumberp(oldsfep));
1181 xfs_dir2_sf_put_inumber(sfp, &ino, xfs_dir2_sf_inumberp(sfep));
1184 * Clean up the inode.
1187 dp->i_d.di_size = newsize;
1188 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1192 * Convert from 4-byte inode numbers to 8-byte inode numbers.
1193 * The new 8-byte inode number is not there yet, we leave with the
1194 * count 1 but no corresponding entry.
1198 xfs_da_args_t *args) /* operation arguments */
1200 char *buf; /* old dir's buffer */
1201 xfs_inode_t *dp; /* incore directory inode */
1202 int i; /* entry index */
1203 xfs_ino_t ino; /* entry inode number */
1204 int newsize; /* new inode size */
1205 xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */
1206 xfs_dir2_sf_t *oldsfp; /* old sf directory */
1207 int oldsize; /* old inode size */
1208 xfs_dir2_sf_entry_t *sfep; /* new sf entry */
1209 xfs_dir2_sf_t *sfp; /* new sf directory */
1211 trace_xfs_dir2_sf_toino8(args);
1216 * Copy the old directory to the buffer.
1217 * Then nuke it from the inode, and add the new buffer to the inode.
1218 * Don't want xfs_idata_realloc copying the data here.
1220 oldsize = dp->i_df.if_bytes;
1221 buf = kmem_alloc(oldsize, KM_SLEEP);
1222 oldsfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1223 ASSERT(oldsfp->hdr.i8count == 0);
1224 memcpy(buf, oldsfp, oldsize);
1226 * Compute the new inode size.
1230 (oldsfp->hdr.count + 1) *
1231 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
1232 xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1233 xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1235 * Reset our pointers, the data has moved.
1237 oldsfp = (xfs_dir2_sf_t *)buf;
1238 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1240 * Fill in the new header.
1242 sfp->hdr.count = oldsfp->hdr.count;
1243 sfp->hdr.i8count = 1;
1244 ino = xfs_dir2_sf_get_inumber(oldsfp, &oldsfp->hdr.parent);
1245 xfs_dir2_sf_put_inumber(sfp, &ino, &sfp->hdr.parent);
1247 * Copy the entries field by field.
1249 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1250 oldsfep = xfs_dir2_sf_firstentry(oldsfp);
1252 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep),
1253 oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep)) {
1254 sfep->namelen = oldsfep->namelen;
1255 sfep->offset = oldsfep->offset;
1256 memcpy(sfep->name, oldsfep->name, sfep->namelen);
1257 ino = xfs_dir2_sf_get_inumber(oldsfp,
1258 xfs_dir2_sf_inumberp(oldsfep));
1259 xfs_dir2_sf_put_inumber(sfp, &ino, xfs_dir2_sf_inumberp(sfep));
1262 * Clean up the inode.
1265 dp->i_d.di_size = newsize;
1266 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1268 #endif /* XFS_BIG_INUMS */