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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include "xfs.h"
Nathan Scotta844f452005-11-02 14:38:42 +110019#include "xfs_fs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include "xfs_types.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include "xfs_log.h"
Nathan Scotta844f452005-11-02 14:38:42 +110022#include "xfs_inum.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include "xfs_trans.h"
24#include "xfs_sb.h"
David Chinnerda353b02007-08-28 14:00:13 +100025#include "xfs_ag.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include "xfs_dir2.h"
27#include "xfs_dmapi.h"
28#include "xfs_mount.h"
Nathan Scotta844f452005-11-02 14:38:42 +110029#include "xfs_da_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include "xfs_bmap_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include "xfs_dir2_sf.h"
Nathan Scotta844f452005-11-02 14:38:42 +110032#include "xfs_attr_sf.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include "xfs_dinode.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include "xfs_inode.h"
Nathan Scotta844f452005-11-02 14:38:42 +110035#include "xfs_inode_item.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include "xfs_error.h"
37#include "xfs_dir2_data.h"
38#include "xfs_dir2_leaf.h"
39#include "xfs_dir2_block.h"
40#include "xfs_dir2_trace.h"
41
42/*
43 * Prototypes for internal functions.
44 */
45static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args,
46 xfs_dir2_sf_entry_t *sfep,
47 xfs_dir2_data_aoff_t offset,
48 int new_isize);
49static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange,
50 int new_isize);
51static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange,
52 xfs_dir2_sf_entry_t **sfepp,
53 xfs_dir2_data_aoff_t *offsetp);
54#ifdef DEBUG
55static void xfs_dir2_sf_check(xfs_da_args_t *args);
56#else
57#define xfs_dir2_sf_check(args)
58#endif /* DEBUG */
59#if XFS_BIG_INUMS
60static void xfs_dir2_sf_toino4(xfs_da_args_t *args);
61static void xfs_dir2_sf_toino8(xfs_da_args_t *args);
62#endif /* XFS_BIG_INUMS */
63
64/*
65 * Given a block directory (dp/block), calculate its size as a shortform (sf)
66 * directory and a header for the sf directory, if it will fit it the
67 * space currently present in the inode. If it won't fit, the output
68 * size is too big (but not accurate).
69 */
70int /* size for sf form */
71xfs_dir2_block_sfsize(
72 xfs_inode_t *dp, /* incore inode pointer */
73 xfs_dir2_block_t *block, /* block directory data */
74 xfs_dir2_sf_hdr_t *sfhp) /* output: header for sf form */
75{
76 xfs_dir2_dataptr_t addr; /* data entry address */
77 xfs_dir2_leaf_entry_t *blp; /* leaf area of the block */
78 xfs_dir2_block_tail_t *btp; /* tail area of the block */
79 int count; /* shortform entry count */
80 xfs_dir2_data_entry_t *dep; /* data entry in the block */
81 int i; /* block entry index */
82 int i8count; /* count of big-inode entries */
83 int isdot; /* entry is "." */
84 int isdotdot; /* entry is ".." */
85 xfs_mount_t *mp; /* mount structure pointer */
86 int namelen; /* total name bytes */
Christoph Hellwig5bde1ba2005-11-02 15:06:18 +110087 xfs_ino_t parent = 0; /* parent inode number */
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 int size=0; /* total computed size */
89
90 mp = dp->i_mount;
91
92 count = i8count = namelen = 0;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +100093 btp = xfs_dir2_block_tail_p(mp, block);
94 blp = xfs_dir2_block_leaf_p(btp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
96 /*
97 * Iterate over the block's data entries by using the leaf pointers.
98 */
Nathan Scotte922fff2006-03-17 17:27:56 +110099 for (i = 0; i < be32_to_cpu(btp->count); i++) {
Nathan Scott3c1f9c12006-03-17 17:28:18 +1100100 if ((addr = be32_to_cpu(blp[i].address)) == XFS_DIR2_NULL_DATAPTR)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 continue;
102 /*
103 * Calculate the pointer to the entry at hand.
104 */
105 dep = (xfs_dir2_data_entry_t *)
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000106 ((char *)block + xfs_dir2_dataptr_to_off(mp, addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 /*
108 * Detect . and .., so we can special-case them.
109 * . is not included in sf directories.
110 * .. is included by just the parent inode number.
111 */
112 isdot = dep->namelen == 1 && dep->name[0] == '.';
113 isdotdot =
114 dep->namelen == 2 &&
115 dep->name[0] == '.' && dep->name[1] == '.';
116#if XFS_BIG_INUMS
117 if (!isdot)
Christoph Hellwigff9901c2006-06-09 14:48:37 +1000118 i8count += be64_to_cpu(dep->inumber) > XFS_DIR2_MAX_SHORT_INUM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119#endif
120 if (!isdot && !isdotdot) {
121 count++;
122 namelen += dep->namelen;
123 } else if (isdotdot)
Christoph Hellwigff9901c2006-06-09 14:48:37 +1000124 parent = be64_to_cpu(dep->inumber);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 /*
126 * Calculate the new size, see if we should give up yet.
127 */
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000128 size = xfs_dir2_sf_hdr_size(i8count) + /* header */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 count + /* namelen */
130 count * (uint)sizeof(xfs_dir2_sf_off_t) + /* offset */
131 namelen + /* name */
132 (i8count ? /* inumber */
133 (uint)sizeof(xfs_dir2_ino8_t) * count :
134 (uint)sizeof(xfs_dir2_ino4_t) * count);
135 if (size > XFS_IFORK_DSIZE(dp))
136 return size; /* size value is a failure */
137 }
138 /*
139 * Create the output header, if it worked.
140 */
141 sfhp->count = count;
142 sfhp->i8count = i8count;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000143 xfs_dir2_sf_put_inumber((xfs_dir2_sf_t *)sfhp, &parent, &sfhp->parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 return size;
145}
146
147/*
148 * Convert a block format directory to shortform.
149 * Caller has already checked that it will fit, and built us a header.
150 */
151int /* error */
152xfs_dir2_block_to_sf(
153 xfs_da_args_t *args, /* operation arguments */
154 xfs_dabuf_t *bp, /* block buffer */
155 int size, /* shortform directory size */
156 xfs_dir2_sf_hdr_t *sfhp) /* shortform directory hdr */
157{
158 xfs_dir2_block_t *block; /* block structure */
159 xfs_dir2_block_tail_t *btp; /* block tail pointer */
160 xfs_dir2_data_entry_t *dep; /* data entry pointer */
161 xfs_inode_t *dp; /* incore directory inode */
162 xfs_dir2_data_unused_t *dup; /* unused data pointer */
163 char *endptr; /* end of data entries */
164 int error; /* error return value */
165 int logflags; /* inode logging flags */
166 xfs_mount_t *mp; /* filesystem mount point */
167 char *ptr; /* current data pointer */
168 xfs_dir2_sf_entry_t *sfep; /* shortform entry */
169 xfs_dir2_sf_t *sfp; /* shortform structure */
170 xfs_ino_t temp;
171
172 xfs_dir2_trace_args_sb("block_to_sf", args, size, bp);
173 dp = args->dp;
174 mp = dp->i_mount;
175
176 /*
177 * Make a copy of the block data, so we can shrink the inode
178 * and add local data.
179 */
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);
185 goto out;
186 }
187 /*
188 * The buffer is now unconditionally gone, whether
189 * xfs_dir2_shrink_inode worked or not.
190 *
191 * Convert the inode to local format.
192 */
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;
199 /*
200 * Copy the header into the newly allocate local space.
201 */
202 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000203 memcpy(sfp, sfhp, xfs_dir2_sf_hdr_size(sfhp->i8count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 dp->i_d.di_size = size;
205 /*
206 * Set up to loop over the block's entries.
207 */
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000208 btp = xfs_dir2_block_tail_p(mp, block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 ptr = (char *)block->u;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000210 endptr = (char *)xfs_dir2_block_leaf_p(btp);
211 sfep = xfs_dir2_sf_firstentry(sfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 /*
213 * Loop over the active and unused entries.
214 * Stop when we reach the leaf/tail portion of the block.
215 */
216 while (ptr < endptr) {
217 /*
218 * If it's unused, just skip over it.
219 */
220 dup = (xfs_dir2_data_unused_t *)ptr;
Nathan Scottad354eb2006-03-17 17:27:37 +1100221 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
222 ptr += be16_to_cpu(dup->length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 continue;
224 }
225 dep = (xfs_dir2_data_entry_t *)ptr;
226 /*
227 * Skip .
228 */
229 if (dep->namelen == 1 && dep->name[0] == '.')
Christoph Hellwigff9901c2006-06-09 14:48:37 +1000230 ASSERT(be64_to_cpu(dep->inumber) == dp->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 /*
232 * Skip .., but make sure the inode number is right.
233 */
234 else if (dep->namelen == 2 &&
235 dep->name[0] == '.' && dep->name[1] == '.')
Christoph Hellwigff9901c2006-06-09 14:48:37 +1000236 ASSERT(be64_to_cpu(dep->inumber) ==
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000237 xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 /*
239 * Normal entry, copy it into shortform.
240 */
241 else {
242 sfep->namelen = dep->namelen;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000243 xfs_dir2_sf_put_offset(sfep,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 (xfs_dir2_data_aoff_t)
245 ((char *)dep - (char *)block));
246 memcpy(sfep->name, dep->name, dep->namelen);
Christoph Hellwigff9901c2006-06-09 14:48:37 +1000247 temp = be64_to_cpu(dep->inumber);
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000248 xfs_dir2_sf_put_inumber(sfp, &temp,
249 xfs_dir2_sf_inumberp(sfep));
250 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 }
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000252 ptr += xfs_dir2_data_entsize(dep->namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 }
254 ASSERT((char *)sfep - (char *)sfp == size);
255 xfs_dir2_sf_check(args);
256out:
257 xfs_trans_log_inode(args->trans, dp, logflags);
258 kmem_free(block, mp->m_dirblksize);
259 return error;
260}
261
262/*
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.
267 */
268int /* error */
269xfs_dir2_sf_addname(
270 xfs_da_args_t *args) /* operation arguments */
271{
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 */
Christoph Hellwig5bde1ba2005-11-02 15:06:18 +1100278 xfs_dir2_data_aoff_t offset = 0; /* offset for new entry */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 int old_isize; /* di_size before adding name */
280 int pick; /* which algorithm to use */
281 xfs_dir2_sf_t *sfp; /* shortform structure */
Christoph Hellwig5bde1ba2005-11-02 15:06:18 +1100282 xfs_dir2_sf_entry_t *sfep = NULL; /* shortform entry */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
284 xfs_dir2_trace_args("sf_addname", args);
285 ASSERT(xfs_dir2_sf_lookup(args) == ENOENT);
286 dp = args->dp;
287 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
288 /*
289 * Make sure the shortform value has some of its header.
290 */
291 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
292 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
293 return XFS_ERROR(EIO);
294 }
295 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
296 ASSERT(dp->i_df.if_u1.if_data != NULL);
297 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000298 ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 /*
300 * Compute entry (and change in) size.
301 */
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000302 add_entsize = xfs_dir2_sf_entsize_byname(sfp, args->namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 incr_isize = add_entsize;
304 objchange = 0;
305#if XFS_BIG_INUMS
306 /*
307 * Do we have to change to 8 byte inodes?
308 */
309 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->hdr.i8count == 0) {
310 /*
311 * Yes, adjust the entry size and the total size.
312 */
313 add_entsize +=
314 (uint)sizeof(xfs_dir2_ino8_t) -
315 (uint)sizeof(xfs_dir2_ino4_t);
316 incr_isize +=
317 (sfp->hdr.count + 2) *
318 ((uint)sizeof(xfs_dir2_ino8_t) -
319 (uint)sizeof(xfs_dir2_ino4_t));
320 objchange = 1;
321 }
322#endif
323 old_isize = (int)dp->i_d.di_size;
324 new_isize = old_isize + incr_isize;
325 /*
326 * Won't fit as shortform any more (due to size),
327 * or the pick routine says it won't (due to offset values).
328 */
329 if (new_isize > XFS_IFORK_DSIZE(dp) ||
330 (pick =
331 xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) {
332 /*
333 * Just checking or no space reservation, it doesn't fit.
334 */
335 if (args->justcheck || args->total == 0)
336 return XFS_ERROR(ENOSPC);
337 /*
338 * Convert to block form then add the name.
339 */
340 error = xfs_dir2_sf_to_block(args);
341 if (error)
342 return error;
343 return xfs_dir2_block_addname(args);
344 }
345 /*
346 * Just checking, it fits.
347 */
348 if (args->justcheck)
349 return 0;
350 /*
351 * Do it the easy way - just add it at the end.
352 */
353 if (pick == 1)
354 xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize);
355 /*
356 * Do it the hard way - look for a place to insert the new entry.
357 * Convert to 8 byte inode numbers first if necessary.
358 */
359 else {
360 ASSERT(pick == 2);
361#if XFS_BIG_INUMS
362 if (objchange)
363 xfs_dir2_sf_toino8(args);
364#endif
365 xfs_dir2_sf_addname_hard(args, objchange, new_isize);
366 }
367 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
368 return 0;
369}
370
371/*
372 * Add the new entry the "easy" way.
373 * This is copying the old directory and adding the new entry at the end.
374 * Since it's sorted by "offset" we need room after the last offset
375 * that's already there, and then room to convert to a block directory.
376 * This is already checked by the pick routine.
377 */
378static void
379xfs_dir2_sf_addname_easy(
380 xfs_da_args_t *args, /* operation arguments */
381 xfs_dir2_sf_entry_t *sfep, /* pointer to new entry */
382 xfs_dir2_data_aoff_t offset, /* offset to use for new ent */
383 int new_isize) /* new directory size */
384{
385 int byteoff; /* byte offset in sf dir */
386 xfs_inode_t *dp; /* incore directory inode */
387 xfs_dir2_sf_t *sfp; /* shortform structure */
388
389 dp = args->dp;
390
391 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
392 byteoff = (int)((char *)sfep - (char *)sfp);
393 /*
394 * Grow the in-inode space.
395 */
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000396 xfs_idata_realloc(dp, xfs_dir2_sf_entsize_byname(sfp, args->namelen),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 XFS_DATA_FORK);
398 /*
399 * Need to set up again due to realloc of the inode data.
400 */
401 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
402 sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + byteoff);
403 /*
404 * Fill in the new entry.
405 */
406 sfep->namelen = args->namelen;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000407 xfs_dir2_sf_put_offset(sfep, offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 memcpy(sfep->name, args->name, sfep->namelen);
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000409 xfs_dir2_sf_put_inumber(sfp, &args->inumber,
410 xfs_dir2_sf_inumberp(sfep));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 /*
412 * Update the header and inode.
413 */
414 sfp->hdr.count++;
415#if XFS_BIG_INUMS
416 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM)
417 sfp->hdr.i8count++;
418#endif
419 dp->i_d.di_size = new_isize;
420 xfs_dir2_sf_check(args);
421}
422
423/*
424 * Add the new entry the "hard" way.
425 * The caller has already converted to 8 byte inode numbers if necessary,
426 * in which case we need to leave the i8count at 1.
427 * Find a hole that the new entry will fit into, and copy
428 * the first part of the entries, the new entry, and the last part of
429 * the entries.
430 */
431/* ARGSUSED */
432static void
433xfs_dir2_sf_addname_hard(
434 xfs_da_args_t *args, /* operation arguments */
435 int objchange, /* changing inode number size */
436 int new_isize) /* new directory size */
437{
438 int add_datasize; /* data size need for new ent */
439 char *buf; /* buffer for old */
440 xfs_inode_t *dp; /* incore directory inode */
441 int eof; /* reached end of old dir */
442 int nbytes; /* temp for byte copies */
443 xfs_dir2_data_aoff_t new_offset; /* next offset value */
444 xfs_dir2_data_aoff_t offset; /* current offset value */
445 int old_isize; /* previous di_size */
446 xfs_dir2_sf_entry_t *oldsfep; /* entry in original dir */
447 xfs_dir2_sf_t *oldsfp; /* original shortform dir */
448 xfs_dir2_sf_entry_t *sfep; /* entry in new dir */
449 xfs_dir2_sf_t *sfp; /* new shortform dir */
450
451 /*
452 * Copy the old directory to the stack buffer.
453 */
454 dp = args->dp;
455
456 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
457 old_isize = (int)dp->i_d.di_size;
458 buf = kmem_alloc(old_isize, KM_SLEEP);
459 oldsfp = (xfs_dir2_sf_t *)buf;
460 memcpy(oldsfp, sfp, old_isize);
461 /*
462 * Loop over the old directory finding the place we're going
463 * to insert the new entry.
464 * If it's going to end up at the end then oldsfep will point there.
465 */
466 for (offset = XFS_DIR2_DATA_FIRST_OFFSET,
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000467 oldsfep = xfs_dir2_sf_firstentry(oldsfp),
468 add_datasize = xfs_dir2_data_entsize(args->namelen),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 eof = (char *)oldsfep == &buf[old_isize];
470 !eof;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000471 offset = new_offset + xfs_dir2_data_entsize(oldsfep->namelen),
472 oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 eof = (char *)oldsfep == &buf[old_isize]) {
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000474 new_offset = xfs_dir2_sf_get_offset(oldsfep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 if (offset + add_datasize <= new_offset)
476 break;
477 }
478 /*
479 * Get rid of the old directory, then allocate space for
480 * the new one. We do this so xfs_idata_realloc won't copy
481 * the data.
482 */
483 xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK);
484 xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK);
485 /*
486 * Reset the pointer since the buffer was reallocated.
487 */
488 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
489 /*
490 * Copy the first part of the directory, including the header.
491 */
492 nbytes = (int)((char *)oldsfep - (char *)oldsfp);
493 memcpy(sfp, oldsfp, nbytes);
494 sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes);
495 /*
496 * Fill in the new entry, and update the header counts.
497 */
498 sfep->namelen = args->namelen;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000499 xfs_dir2_sf_put_offset(sfep, offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 memcpy(sfep->name, args->name, sfep->namelen);
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000501 xfs_dir2_sf_put_inumber(sfp, &args->inumber,
502 xfs_dir2_sf_inumberp(sfep));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 sfp->hdr.count++;
504#if XFS_BIG_INUMS
505 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange)
506 sfp->hdr.i8count++;
507#endif
508 /*
509 * If there's more left to copy, do that.
510 */
511 if (!eof) {
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000512 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 memcpy(sfep, oldsfep, old_isize - nbytes);
514 }
515 kmem_free(buf, old_isize);
516 dp->i_d.di_size = new_isize;
517 xfs_dir2_sf_check(args);
518}
519
520/*
521 * Decide if the new entry will fit at all.
522 * If it will fit, pick between adding the new entry to the end (easy)
523 * or somewhere else (hard).
524 * Return 0 (won't fit), 1 (easy), 2 (hard).
525 */
526/*ARGSUSED*/
527static int /* pick result */
528xfs_dir2_sf_addname_pick(
529 xfs_da_args_t *args, /* operation arguments */
530 int objchange, /* inode # size changes */
531 xfs_dir2_sf_entry_t **sfepp, /* out(1): new entry ptr */
532 xfs_dir2_data_aoff_t *offsetp) /* out(1): new offset */
533{
534 xfs_inode_t *dp; /* incore directory inode */
535 int holefit; /* found hole it will fit in */
536 int i; /* entry number */
537 xfs_mount_t *mp; /* filesystem mount point */
538 xfs_dir2_data_aoff_t offset; /* data block offset */
539 xfs_dir2_sf_entry_t *sfep; /* shortform entry */
540 xfs_dir2_sf_t *sfp; /* shortform structure */
541 int size; /* entry's data size */
542 int used; /* data bytes used */
543
544 dp = args->dp;
545 mp = dp->i_mount;
546
547 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000548 size = xfs_dir2_data_entsize(args->namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 offset = XFS_DIR2_DATA_FIRST_OFFSET;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000550 sfep = xfs_dir2_sf_firstentry(sfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 holefit = 0;
552 /*
553 * Loop over sf entries.
554 * Keep track of data offset and whether we've seen a place
555 * to insert the new entry.
556 */
557 for (i = 0; i < sfp->hdr.count; i++) {
558 if (!holefit)
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000559 holefit = offset + size <= xfs_dir2_sf_get_offset(sfep);
560 offset = xfs_dir2_sf_get_offset(sfep) +
561 xfs_dir2_data_entsize(sfep->namelen);
562 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 }
564 /*
565 * Calculate data bytes used excluding the new entry, if this
566 * was a data block (block form directory).
567 */
568 used = offset +
569 (sfp->hdr.count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
570 (uint)sizeof(xfs_dir2_block_tail_t);
571 /*
572 * If it won't fit in a block form then we can't insert it,
573 * we'll go back, convert to block, then try the insert and convert
574 * to leaf.
575 */
576 if (used + (holefit ? 0 : size) > mp->m_dirblksize)
577 return 0;
578 /*
579 * If changing the inode number size, do it the hard way.
580 */
581#if XFS_BIG_INUMS
582 if (objchange) {
583 return 2;
584 }
585#else
586 ASSERT(objchange == 0);
587#endif
588 /*
589 * If it won't fit at the end then do it the hard way (use the hole).
590 */
591 if (used + size > mp->m_dirblksize)
592 return 2;
593 /*
594 * Do it the easy way.
595 */
596 *sfepp = sfep;
597 *offsetp = offset;
598 return 1;
599}
600
601#ifdef DEBUG
602/*
603 * Check consistency of shortform directory, assert if bad.
604 */
605static void
606xfs_dir2_sf_check(
607 xfs_da_args_t *args) /* operation arguments */
608{
609 xfs_inode_t *dp; /* incore directory inode */
610 int i; /* entry number */
611 int i8count; /* number of big inode#s */
612 xfs_ino_t ino; /* entry inode number */
613 int offset; /* data offset */
614 xfs_dir2_sf_entry_t *sfep; /* shortform dir entry */
615 xfs_dir2_sf_t *sfp; /* shortform structure */
616
617 dp = args->dp;
618
619 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
620 offset = XFS_DIR2_DATA_FIRST_OFFSET;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000621 ino = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
623
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000624 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 i < sfp->hdr.count;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000626 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
627 ASSERT(xfs_dir2_sf_get_offset(sfep) >= offset);
628 ino = xfs_dir2_sf_get_inumber(sfp, xfs_dir2_sf_inumberp(sfep));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
630 offset =
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000631 xfs_dir2_sf_get_offset(sfep) +
632 xfs_dir2_data_entsize(sfep->namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 }
634 ASSERT(i8count == sfp->hdr.i8count);
635 ASSERT(XFS_BIG_INUMS || i8count == 0);
636 ASSERT((char *)sfep - (char *)sfp == dp->i_d.di_size);
637 ASSERT(offset +
638 (sfp->hdr.count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
639 (uint)sizeof(xfs_dir2_block_tail_t) <=
640 dp->i_mount->m_dirblksize);
641}
642#endif /* DEBUG */
643
644/*
645 * Create a new (shortform) directory.
646 */
647int /* error, always 0 */
648xfs_dir2_sf_create(
649 xfs_da_args_t *args, /* operation arguments */
650 xfs_ino_t pino) /* parent inode number */
651{
652 xfs_inode_t *dp; /* incore directory inode */
653 int i8count; /* parent inode is an 8-byte number */
654 xfs_dir2_sf_t *sfp; /* shortform structure */
655 int size; /* directory size */
656
657 xfs_dir2_trace_args_i("sf_create", args, pino);
658 dp = args->dp;
659
660 ASSERT(dp != NULL);
661 ASSERT(dp->i_d.di_size == 0);
662 /*
663 * If it's currently a zero-length extent file,
664 * convert it to local format.
665 */
666 if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) {
667 dp->i_df.if_flags &= ~XFS_IFEXTENTS; /* just in case */
668 dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
669 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
670 dp->i_df.if_flags |= XFS_IFINLINE;
671 }
672 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
673 ASSERT(dp->i_df.if_bytes == 0);
674 i8count = pino > XFS_DIR2_MAX_SHORT_INUM;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000675 size = xfs_dir2_sf_hdr_size(i8count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 /*
677 * Make a buffer for the data.
678 */
679 xfs_idata_realloc(dp, size, XFS_DATA_FORK);
680 /*
681 * Fill in the header,
682 */
683 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
684 sfp->hdr.i8count = i8count;
685 /*
686 * Now can put in the inode number, since i8count is set.
687 */
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000688 xfs_dir2_sf_put_inumber(sfp, &pino, &sfp->hdr.parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 sfp->hdr.count = 0;
690 dp->i_d.di_size = size;
691 xfs_dir2_sf_check(args);
692 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
693 return 0;
694}
695
696int /* error */
697xfs_dir2_sf_getdents(
698 xfs_inode_t *dp, /* incore directory inode */
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000699 void *dirent,
700 xfs_off_t *offset,
701 filldir_t filldir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 int i; /* shortform entry number */
704 xfs_mount_t *mp; /* filesystem mount point */
705 xfs_dir2_dataptr_t off; /* current entry's offset */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
707 xfs_dir2_sf_t *sfp; /* shortform structure */
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000708 xfs_dir2_dataptr_t dot_offset;
709 xfs_dir2_dataptr_t dotdot_offset;
710 xfs_ino_t ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
724 ASSERT(dp->i_df.if_u1.if_data != NULL);
725
726 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
727
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000728 ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729
730 /*
731 * If the block number in the offset is out of range, we're done.
732 */
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000733 if (xfs_dir2_dataptr_to_db(mp, *offset) > mp->m_dirdatablk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735
736 /*
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000737 * Precalculate offsets for . and .. as we will always need them.
738 *
739 * XXX(hch): the second argument is sometimes 0 and sometimes
740 * mp->m_dirdatablk.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 */
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000742 dot_offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
743 XFS_DIR2_DATA_DOT_OFFSET);
744 dotdot_offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
745 XFS_DIR2_DATA_DOTDOT_OFFSET);
746
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 /*
748 * Put . entry unless we're starting past it.
749 */
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000750 if (*offset <= dot_offset) {
751 ino = dp->i_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752#if XFS_BIG_INUMS
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000753 ino += mp->m_inoadd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754#endif
Lachlan McIlroy041388b2007-12-18 16:19:34 +1100755 if (filldir(dirent, ".", 1, dot_offset, ino, DT_DIR)) {
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000756 *offset = dot_offset;
757 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 }
759 }
760
761 /*
762 * Put .. entry unless we're starting past it.
763 */
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000764 if (*offset <= dotdot_offset) {
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000765 ino = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766#if XFS_BIG_INUMS
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000767 ino += mp->m_inoadd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768#endif
Lachlan McIlroy041388b2007-12-18 16:19:34 +1100769 if (filldir(dirent, "..", 2, dotdot_offset, ino, DT_DIR)) {
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000770 *offset = dotdot_offset;
771 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 }
773 }
774
775 /*
776 * Loop while there are more entries and put'ing works.
777 */
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000778 sfep = xfs_dir2_sf_firstentry(sfp);
779 for (i = 0; i < sfp->hdr.count; i++) {
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000780 off = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
781 xfs_dir2_sf_get_offset(sfep));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000783 if (*offset > off) {
784 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 }
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000787
788 ino = xfs_dir2_sf_get_inumber(sfp, xfs_dir2_sf_inumberp(sfep));
789#if XFS_BIG_INUMS
790 ino += mp->m_inoadd;
791#endif
792
793 if (filldir(dirent, sfep->name, sfep->namelen,
Lachlan McIlroy041388b2007-12-18 16:19:34 +1100794 off, ino, DT_UNKNOWN)) {
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000795 *offset = off;
796 return 0;
797 }
798 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 }
800
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000801 *offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk + 1, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 return 0;
803}
804
805/*
806 * Lookup an entry in a shortform directory.
807 * Returns EEXIST if found, ENOENT if not found.
808 */
809int /* error */
810xfs_dir2_sf_lookup(
811 xfs_da_args_t *args) /* operation arguments */
812{
813 xfs_inode_t *dp; /* incore directory inode */
814 int i; /* entry index */
815 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
816 xfs_dir2_sf_t *sfp; /* shortform structure */
817
818 xfs_dir2_trace_args("sf_lookup", args);
819 xfs_dir2_sf_check(args);
820 dp = args->dp;
821
822 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
823 /*
824 * Bail out if the directory is way too short.
825 */
826 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
827 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
828 return XFS_ERROR(EIO);
829 }
830 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
831 ASSERT(dp->i_df.if_u1.if_data != NULL);
832 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000833 ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 /*
835 * Special case for .
836 */
837 if (args->namelen == 1 && args->name[0] == '.') {
838 args->inumber = dp->i_ino;
839 return XFS_ERROR(EEXIST);
840 }
841 /*
842 * Special case for ..
843 */
844 if (args->namelen == 2 &&
845 args->name[0] == '.' && args->name[1] == '.') {
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000846 args->inumber = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 return XFS_ERROR(EEXIST);
848 }
849 /*
850 * Loop over all the entries trying to match ours.
851 */
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000852 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 i < sfp->hdr.count;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000854 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 if (sfep->namelen == args->namelen &&
856 sfep->name[0] == args->name[0] &&
857 memcmp(args->name, sfep->name, args->namelen) == 0) {
858 args->inumber =
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000859 xfs_dir2_sf_get_inumber(sfp,
860 xfs_dir2_sf_inumberp(sfep));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 return XFS_ERROR(EEXIST);
862 }
863 }
864 /*
865 * Didn't find it.
866 */
867 ASSERT(args->oknoent);
868 return XFS_ERROR(ENOENT);
869}
870
871/*
872 * Remove an entry from a shortform directory.
873 */
874int /* error */
875xfs_dir2_sf_removename(
876 xfs_da_args_t *args)
877{
878 int byteoff; /* offset of removed entry */
879 xfs_inode_t *dp; /* incore directory inode */
880 int entsize; /* this entry's size */
881 int i; /* shortform entry index */
882 int newsize; /* new inode size */
883 int oldsize; /* old inode size */
884 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
885 xfs_dir2_sf_t *sfp; /* shortform structure */
886
887 xfs_dir2_trace_args("sf_removename", args);
888 dp = args->dp;
889
890 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
891 oldsize = (int)dp->i_d.di_size;
892 /*
893 * Bail out if the directory is way too short.
894 */
895 if (oldsize < offsetof(xfs_dir2_sf_hdr_t, parent)) {
896 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
897 return XFS_ERROR(EIO);
898 }
899 ASSERT(dp->i_df.if_bytes == oldsize);
900 ASSERT(dp->i_df.if_u1.if_data != NULL);
901 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000902 ASSERT(oldsize >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 /*
904 * Loop over the old directory entries.
905 * Find the one we're deleting.
906 */
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000907 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 i < sfp->hdr.count;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000909 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 if (sfep->namelen == args->namelen &&
911 sfep->name[0] == args->name[0] &&
912 memcmp(sfep->name, args->name, args->namelen) == 0) {
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000913 ASSERT(xfs_dir2_sf_get_inumber(sfp,
914 xfs_dir2_sf_inumberp(sfep)) ==
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 args->inumber);
916 break;
917 }
918 }
919 /*
920 * Didn't find it.
921 */
922 if (i == sfp->hdr.count) {
923 return XFS_ERROR(ENOENT);
924 }
925 /*
926 * Calculate sizes.
927 */
928 byteoff = (int)((char *)sfep - (char *)sfp);
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000929 entsize = xfs_dir2_sf_entsize_byname(sfp, args->namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 newsize = oldsize - entsize;
931 /*
932 * Copy the part if any after the removed entry, sliding it down.
933 */
934 if (byteoff + entsize < oldsize)
935 memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize,
936 oldsize - (byteoff + entsize));
937 /*
938 * Fix up the header and file size.
939 */
940 sfp->hdr.count--;
941 dp->i_d.di_size = newsize;
942 /*
943 * Reallocate, making it smaller.
944 */
945 xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
946 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
947#if XFS_BIG_INUMS
948 /*
949 * Are we changing inode number size?
950 */
951 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
952 if (sfp->hdr.i8count == 1)
953 xfs_dir2_sf_toino4(args);
954 else
955 sfp->hdr.i8count--;
956 }
957#endif
958 xfs_dir2_sf_check(args);
959 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
960 return 0;
961}
962
963/*
964 * Replace the inode number of an entry in a shortform directory.
965 */
966int /* error */
967xfs_dir2_sf_replace(
968 xfs_da_args_t *args) /* operation arguments */
969{
970 xfs_inode_t *dp; /* incore directory inode */
971 int i; /* entry index */
972#if XFS_BIG_INUMS || defined(DEBUG)
973 xfs_ino_t ino=0; /* entry old inode number */
974#endif
975#if XFS_BIG_INUMS
976 int i8elevated; /* sf_toino8 set i8count=1 */
977#endif
978 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
979 xfs_dir2_sf_t *sfp; /* shortform structure */
980
981 xfs_dir2_trace_args("sf_replace", args);
982 dp = args->dp;
983
984 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
985 /*
986 * Bail out if the shortform directory is way too small.
987 */
988 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
989 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
990 return XFS_ERROR(EIO);
991 }
992 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
993 ASSERT(dp->i_df.if_u1.if_data != NULL);
994 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000995 ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996#if XFS_BIG_INUMS
997 /*
998 * New inode number is large, and need to convert to 8-byte inodes.
999 */
1000 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->hdr.i8count == 0) {
1001 int error; /* error return value */
1002 int newsize; /* new inode size */
1003
1004 newsize =
1005 dp->i_df.if_bytes +
1006 (sfp->hdr.count + 1) *
1007 ((uint)sizeof(xfs_dir2_ino8_t) -
1008 (uint)sizeof(xfs_dir2_ino4_t));
1009 /*
1010 * Won't fit as shortform, convert to block then do replace.
1011 */
1012 if (newsize > XFS_IFORK_DSIZE(dp)) {
1013 error = xfs_dir2_sf_to_block(args);
1014 if (error) {
1015 return error;
1016 }
1017 return xfs_dir2_block_replace(args);
1018 }
1019 /*
1020 * Still fits, convert to 8-byte now.
1021 */
1022 xfs_dir2_sf_toino8(args);
1023 i8elevated = 1;
1024 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1025 } else
1026 i8elevated = 0;
1027#endif
1028 ASSERT(args->namelen != 1 || args->name[0] != '.');
1029 /*
1030 * Replace ..'s entry.
1031 */
1032 if (args->namelen == 2 &&
1033 args->name[0] == '.' && args->name[1] == '.') {
1034#if XFS_BIG_INUMS || defined(DEBUG)
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001035 ino = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 ASSERT(args->inumber != ino);
1037#endif
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001038 xfs_dir2_sf_put_inumber(sfp, &args->inumber, &sfp->hdr.parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 }
1040 /*
1041 * Normal entry, look for the name.
1042 */
1043 else {
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001044 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 i < sfp->hdr.count;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001046 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 if (sfep->namelen == args->namelen &&
1048 sfep->name[0] == args->name[0] &&
1049 memcmp(args->name, sfep->name, args->namelen) == 0) {
1050#if XFS_BIG_INUMS || defined(DEBUG)
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001051 ino = xfs_dir2_sf_get_inumber(sfp,
1052 xfs_dir2_sf_inumberp(sfep));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 ASSERT(args->inumber != ino);
1054#endif
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001055 xfs_dir2_sf_put_inumber(sfp, &args->inumber,
1056 xfs_dir2_sf_inumberp(sfep));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057 break;
1058 }
1059 }
1060 /*
1061 * Didn't find it.
1062 */
1063 if (i == sfp->hdr.count) {
1064 ASSERT(args->oknoent);
1065#if XFS_BIG_INUMS
1066 if (i8elevated)
1067 xfs_dir2_sf_toino4(args);
1068#endif
1069 return XFS_ERROR(ENOENT);
1070 }
1071 }
1072#if XFS_BIG_INUMS
1073 /*
1074 * See if the old number was large, the new number is small.
1075 */
1076 if (ino > XFS_DIR2_MAX_SHORT_INUM &&
1077 args->inumber <= XFS_DIR2_MAX_SHORT_INUM) {
1078 /*
1079 * And the old count was one, so need to convert to small.
1080 */
1081 if (sfp->hdr.i8count == 1)
1082 xfs_dir2_sf_toino4(args);
1083 else
1084 sfp->hdr.i8count--;
1085 }
1086 /*
1087 * See if the old number was small, the new number is large.
1088 */
1089 if (ino <= XFS_DIR2_MAX_SHORT_INUM &&
1090 args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
1091 /*
1092 * add to the i8count unless we just converted to 8-byte
1093 * inodes (which does an implied i8count = 1)
1094 */
1095 ASSERT(sfp->hdr.i8count != 0);
1096 if (!i8elevated)
1097 sfp->hdr.i8count++;
1098 }
1099#endif
1100 xfs_dir2_sf_check(args);
1101 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
1102 return 0;
1103}
1104
1105#if XFS_BIG_INUMS
1106/*
1107 * Convert from 8-byte inode numbers to 4-byte inode numbers.
1108 * The last 8-byte inode number is gone, but the count is still 1.
1109 */
1110static void
1111xfs_dir2_sf_toino4(
1112 xfs_da_args_t *args) /* operation arguments */
1113{
1114 char *buf; /* old dir's buffer */
1115 xfs_inode_t *dp; /* incore directory inode */
1116 int i; /* entry index */
1117 xfs_ino_t ino; /* entry inode number */
1118 int newsize; /* new inode size */
1119 xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */
1120 xfs_dir2_sf_t *oldsfp; /* old sf directory */
1121 int oldsize; /* old inode size */
1122 xfs_dir2_sf_entry_t *sfep; /* new sf entry */
1123 xfs_dir2_sf_t *sfp; /* new sf directory */
1124
1125 xfs_dir2_trace_args("sf_toino4", args);
1126 dp = args->dp;
1127
1128 /*
1129 * Copy the old directory to the buffer.
1130 * Then nuke it from the inode, and add the new buffer to the inode.
1131 * Don't want xfs_idata_realloc copying the data here.
1132 */
1133 oldsize = dp->i_df.if_bytes;
1134 buf = kmem_alloc(oldsize, KM_SLEEP);
1135 oldsfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1136 ASSERT(oldsfp->hdr.i8count == 1);
1137 memcpy(buf, oldsfp, oldsize);
1138 /*
1139 * Compute the new inode size.
1140 */
1141 newsize =
1142 oldsize -
1143 (oldsfp->hdr.count + 1) *
1144 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
1145 xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1146 xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1147 /*
1148 * Reset our pointers, the data has moved.
1149 */
1150 oldsfp = (xfs_dir2_sf_t *)buf;
1151 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1152 /*
1153 * Fill in the new header.
1154 */
1155 sfp->hdr.count = oldsfp->hdr.count;
1156 sfp->hdr.i8count = 0;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001157 ino = xfs_dir2_sf_get_inumber(oldsfp, &oldsfp->hdr.parent);
1158 xfs_dir2_sf_put_inumber(sfp, &ino, &sfp->hdr.parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159 /*
1160 * Copy the entries field by field.
1161 */
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001162 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1163 oldsfep = xfs_dir2_sf_firstentry(oldsfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 i < sfp->hdr.count;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001165 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep),
1166 oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 sfep->namelen = oldsfep->namelen;
1168 sfep->offset = oldsfep->offset;
1169 memcpy(sfep->name, oldsfep->name, sfep->namelen);
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001170 ino = xfs_dir2_sf_get_inumber(oldsfp,
1171 xfs_dir2_sf_inumberp(oldsfep));
1172 xfs_dir2_sf_put_inumber(sfp, &ino, xfs_dir2_sf_inumberp(sfep));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 }
1174 /*
1175 * Clean up the inode.
1176 */
1177 kmem_free(buf, oldsize);
1178 dp->i_d.di_size = newsize;
1179 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1180}
1181
1182/*
1183 * Convert from 4-byte inode numbers to 8-byte inode numbers.
1184 * The new 8-byte inode number is not there yet, we leave with the
1185 * count 1 but no corresponding entry.
1186 */
1187static void
1188xfs_dir2_sf_toino8(
1189 xfs_da_args_t *args) /* operation arguments */
1190{
1191 char *buf; /* old dir's buffer */
1192 xfs_inode_t *dp; /* incore directory inode */
1193 int i; /* entry index */
1194 xfs_ino_t ino; /* entry inode number */
1195 int newsize; /* new inode size */
1196 xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */
1197 xfs_dir2_sf_t *oldsfp; /* old sf directory */
1198 int oldsize; /* old inode size */
1199 xfs_dir2_sf_entry_t *sfep; /* new sf entry */
1200 xfs_dir2_sf_t *sfp; /* new sf directory */
1201
1202 xfs_dir2_trace_args("sf_toino8", args);
1203 dp = args->dp;
1204
1205 /*
1206 * Copy the old directory to the buffer.
1207 * Then nuke it from the inode, and add the new buffer to the inode.
1208 * Don't want xfs_idata_realloc copying the data here.
1209 */
1210 oldsize = dp->i_df.if_bytes;
1211 buf = kmem_alloc(oldsize, KM_SLEEP);
1212 oldsfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1213 ASSERT(oldsfp->hdr.i8count == 0);
1214 memcpy(buf, oldsfp, oldsize);
1215 /*
1216 * Compute the new inode size.
1217 */
1218 newsize =
1219 oldsize +
1220 (oldsfp->hdr.count + 1) *
1221 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
1222 xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1223 xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1224 /*
1225 * Reset our pointers, the data has moved.
1226 */
1227 oldsfp = (xfs_dir2_sf_t *)buf;
1228 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1229 /*
1230 * Fill in the new header.
1231 */
1232 sfp->hdr.count = oldsfp->hdr.count;
1233 sfp->hdr.i8count = 1;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001234 ino = xfs_dir2_sf_get_inumber(oldsfp, &oldsfp->hdr.parent);
1235 xfs_dir2_sf_put_inumber(sfp, &ino, &sfp->hdr.parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236 /*
1237 * Copy the entries field by field.
1238 */
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001239 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1240 oldsfep = xfs_dir2_sf_firstentry(oldsfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 i < sfp->hdr.count;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001242 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep),
1243 oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 sfep->namelen = oldsfep->namelen;
1245 sfep->offset = oldsfep->offset;
1246 memcpy(sfep->name, oldsfep->name, sfep->namelen);
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001247 ino = xfs_dir2_sf_get_inumber(oldsfp,
1248 xfs_dir2_sf_inumberp(oldsfep));
1249 xfs_dir2_sf_put_inumber(sfp, &ino, xfs_dir2_sf_inumberp(sfep));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 }
1251 /*
1252 * Clean up the inode.
1253 */
1254 kmem_free(buf, oldsize);
1255 dp->i_d.di_size = newsize;
1256 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1257}
1258#endif /* XFS_BIG_INUMS */