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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"
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include "xfs_mount.h"
Nathan Scotta844f452005-11-02 14:38:42 +110028#include "xfs_da_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include "xfs_bmap_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include "xfs_dir2_sf.h"
31#include "xfs_dinode.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include "xfs_inode.h"
Nathan Scotta844f452005-11-02 14:38:42 +110033#include "xfs_inode_item.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include "xfs_error.h"
35#include "xfs_dir2_data.h"
36#include "xfs_dir2_leaf.h"
37#include "xfs_dir2_block.h"
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000038#include "xfs_trace.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40/*
41 * Prototypes for internal functions.
42 */
43static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args,
44 xfs_dir2_sf_entry_t *sfep,
45 xfs_dir2_data_aoff_t offset,
46 int new_isize);
47static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange,
48 int new_isize);
49static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange,
50 xfs_dir2_sf_entry_t **sfepp,
51 xfs_dir2_data_aoff_t *offsetp);
52#ifdef DEBUG
53static void xfs_dir2_sf_check(xfs_da_args_t *args);
54#else
55#define xfs_dir2_sf_check(args)
56#endif /* DEBUG */
57#if XFS_BIG_INUMS
58static void xfs_dir2_sf_toino4(xfs_da_args_t *args);
59static void xfs_dir2_sf_toino8(xfs_da_args_t *args);
60#endif /* XFS_BIG_INUMS */
61
62/*
63 * Given a block directory (dp/block), calculate its size as a shortform (sf)
64 * directory and a header for the sf directory, if it will fit it the
65 * space currently present in the inode. If it won't fit, the output
66 * size is too big (but not accurate).
67 */
68int /* size for sf form */
69xfs_dir2_block_sfsize(
70 xfs_inode_t *dp, /* incore inode pointer */
71 xfs_dir2_block_t *block, /* block directory data */
72 xfs_dir2_sf_hdr_t *sfhp) /* output: header for sf form */
73{
74 xfs_dir2_dataptr_t addr; /* data entry address */
75 xfs_dir2_leaf_entry_t *blp; /* leaf area of the block */
76 xfs_dir2_block_tail_t *btp; /* tail area of the block */
77 int count; /* shortform entry count */
78 xfs_dir2_data_entry_t *dep; /* data entry in the block */
79 int i; /* block entry index */
80 int i8count; /* count of big-inode entries */
81 int isdot; /* entry is "." */
82 int isdotdot; /* entry is ".." */
83 xfs_mount_t *mp; /* mount structure pointer */
84 int namelen; /* total name bytes */
Christoph Hellwig5bde1ba92005-11-02 15:06:18 +110085 xfs_ino_t parent = 0; /* parent inode number */
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 int size=0; /* total computed size */
87
88 mp = dp->i_mount;
89
90 count = i8count = namelen = 0;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +100091 btp = xfs_dir2_block_tail_p(mp, block);
92 blp = xfs_dir2_block_leaf_p(btp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
94 /*
95 * Iterate over the block's data entries by using the leaf pointers.
96 */
Nathan Scotte922fff2006-03-17 17:27:56 +110097 for (i = 0; i < be32_to_cpu(btp->count); i++) {
Nathan Scott3c1f9c12006-03-17 17:28:18 +110098 if ((addr = be32_to_cpu(blp[i].address)) == XFS_DIR2_NULL_DATAPTR)
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 continue;
100 /*
101 * Calculate the pointer to the entry at hand.
102 */
103 dep = (xfs_dir2_data_entry_t *)
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000104 ((char *)block + xfs_dir2_dataptr_to_off(mp, addr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 /*
106 * Detect . and .., so we can special-case them.
107 * . is not included in sf directories.
108 * .. is included by just the parent inode number.
109 */
110 isdot = dep->namelen == 1 && dep->name[0] == '.';
111 isdotdot =
112 dep->namelen == 2 &&
113 dep->name[0] == '.' && dep->name[1] == '.';
114#if XFS_BIG_INUMS
115 if (!isdot)
Christoph Hellwigff9901c2006-06-09 14:48:37 +1000116 i8count += be64_to_cpu(dep->inumber) > XFS_DIR2_MAX_SHORT_INUM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117#endif
118 if (!isdot && !isdotdot) {
119 count++;
120 namelen += dep->namelen;
121 } else if (isdotdot)
Christoph Hellwigff9901c2006-06-09 14:48:37 +1000122 parent = be64_to_cpu(dep->inumber);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 /*
124 * Calculate the new size, see if we should give up yet.
125 */
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000126 size = xfs_dir2_sf_hdr_size(i8count) + /* header */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 count + /* namelen */
128 count * (uint)sizeof(xfs_dir2_sf_off_t) + /* offset */
129 namelen + /* name */
130 (i8count ? /* inumber */
131 (uint)sizeof(xfs_dir2_ino8_t) * count :
132 (uint)sizeof(xfs_dir2_ino4_t) * count);
133 if (size > XFS_IFORK_DSIZE(dp))
134 return size; /* size value is a failure */
135 }
136 /*
137 * Create the output header, if it worked.
138 */
139 sfhp->count = count;
140 sfhp->i8count = i8count;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000141 xfs_dir2_sf_put_inumber((xfs_dir2_sf_t *)sfhp, &parent, &sfhp->parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 return size;
143}
144
145/*
146 * Convert a block format directory to shortform.
147 * Caller has already checked that it will fit, and built us a header.
148 */
149int /* error */
150xfs_dir2_block_to_sf(
151 xfs_da_args_t *args, /* operation arguments */
152 xfs_dabuf_t *bp, /* block buffer */
153 int size, /* shortform directory size */
154 xfs_dir2_sf_hdr_t *sfhp) /* shortform directory hdr */
155{
156 xfs_dir2_block_t *block; /* block structure */
157 xfs_dir2_block_tail_t *btp; /* block tail pointer */
158 xfs_dir2_data_entry_t *dep; /* data entry pointer */
159 xfs_inode_t *dp; /* incore directory inode */
160 xfs_dir2_data_unused_t *dup; /* unused data pointer */
161 char *endptr; /* end of data entries */
162 int error; /* error return value */
163 int logflags; /* inode logging flags */
164 xfs_mount_t *mp; /* filesystem mount point */
165 char *ptr; /* current data pointer */
166 xfs_dir2_sf_entry_t *sfep; /* shortform entry */
167 xfs_dir2_sf_t *sfp; /* shortform structure */
168 xfs_ino_t temp;
169
Christoph Hellwig0b1b2132009-12-14 23:14:59 +0000170 trace_xfs_dir2_block_to_sf(args);
171
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 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;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000202 memcpy(sfp, sfhp, xfs_dir2_sf_hdr_size(sfhp->i8count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 dp->i_d.di_size = size;
204 /*
205 * Set up to loop over the block's entries.
206 */
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000207 btp = xfs_dir2_block_tail_p(mp, block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 ptr = (char *)block->u;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000209 endptr = (char *)xfs_dir2_block_leaf_p(btp);
210 sfep = xfs_dir2_sf_firstentry(sfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 /*
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;
Nathan Scottad354eb2006-03-17 17:27:37 +1100220 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
221 ptr += be16_to_cpu(dup->length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 continue;
223 }
224 dep = (xfs_dir2_data_entry_t *)ptr;
225 /*
226 * Skip .
227 */
228 if (dep->namelen == 1 && dep->name[0] == '.')
Christoph Hellwigff9901c2006-06-09 14:48:37 +1000229 ASSERT(be64_to_cpu(dep->inumber) == dp->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 /*
231 * Skip .., but make sure the inode number is right.
232 */
233 else if (dep->namelen == 2 &&
234 dep->name[0] == '.' && dep->name[1] == '.')
Christoph Hellwigff9901c2006-06-09 14:48:37 +1000235 ASSERT(be64_to_cpu(dep->inumber) ==
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000236 xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 /*
238 * Normal entry, copy it into shortform.
239 */
240 else {
241 sfep->namelen = dep->namelen;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000242 xfs_dir2_sf_put_offset(sfep,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 (xfs_dir2_data_aoff_t)
244 ((char *)dep - (char *)block));
245 memcpy(sfep->name, dep->name, dep->namelen);
Christoph Hellwigff9901c2006-06-09 14:48:37 +1000246 temp = be64_to_cpu(dep->inumber);
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000247 xfs_dir2_sf_put_inumber(sfp, &temp,
248 xfs_dir2_sf_inumberp(sfep));
249 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 }
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000251 ptr += xfs_dir2_data_entsize(dep->namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 }
253 ASSERT((char *)sfep - (char *)sfp == size);
254 xfs_dir2_sf_check(args);
255out:
256 xfs_trans_log_inode(args->trans, dp, logflags);
Denys Vlasenkof0e2d932008-05-19 16:31:57 +1000257 kmem_free(block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 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 */
267int /* error */
268xfs_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 */
Christoph Hellwig5bde1ba92005-11-02 15:06:18 +1100277 xfs_dir2_data_aoff_t offset = 0; /* offset for new entry */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 int old_isize; /* di_size before adding name */
279 int pick; /* which algorithm to use */
280 xfs_dir2_sf_t *sfp; /* shortform structure */
Christoph Hellwig5bde1ba92005-11-02 15:06:18 +1100281 xfs_dir2_sf_entry_t *sfep = NULL; /* shortform entry */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282
Christoph Hellwig0b1b2132009-12-14 23:14:59 +0000283 trace_xfs_dir2_sf_addname(args);
284
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 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 */
Barry Naujok6a178102008-05-21 16:42:05 +1000335 if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 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 */
Barry Naujok6a178102008-05-21 16:42:05 +1000348 if (args->op_flags & XFS_DA_OP_JUSTCHECK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 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 }
Denys Vlasenkof0e2d932008-05-19 16:31:57 +1000515 kmem_free(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 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
Christoph Hellwig0b1b2132009-12-14 23:14:59 +0000657 trace_xfs_dir2_sf_create(args);
658
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 dp = args->dp;
660
661 ASSERT(dp != NULL);
662 ASSERT(dp->i_d.di_size == 0);
663 /*
664 * If it's currently a zero-length extent file,
665 * convert it to local format.
666 */
667 if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) {
668 dp->i_df.if_flags &= ~XFS_IFEXTENTS; /* just in case */
669 dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
670 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
671 dp->i_df.if_flags |= XFS_IFINLINE;
672 }
673 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
674 ASSERT(dp->i_df.if_bytes == 0);
675 i8count = pino > XFS_DIR2_MAX_SHORT_INUM;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000676 size = xfs_dir2_sf_hdr_size(i8count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 /*
678 * Make a buffer for the data.
679 */
680 xfs_idata_realloc(dp, size, XFS_DATA_FORK);
681 /*
682 * Fill in the header,
683 */
684 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
685 sfp->hdr.i8count = i8count;
686 /*
687 * Now can put in the inode number, since i8count is set.
688 */
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000689 xfs_dir2_sf_put_inumber(sfp, &pino, &sfp->hdr.parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 sfp->hdr.count = 0;
691 dp->i_d.di_size = size;
692 xfs_dir2_sf_check(args);
693 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
694 return 0;
695}
696
697int /* error */
698xfs_dir2_sf_getdents(
699 xfs_inode_t *dp, /* incore directory inode */
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000700 void *dirent,
701 xfs_off_t *offset,
702 filldir_t filldir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 int i; /* shortform entry number */
705 xfs_mount_t *mp; /* filesystem mount point */
706 xfs_dir2_dataptr_t off; /* current entry's offset */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
708 xfs_dir2_sf_t *sfp; /* shortform structure */
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000709 xfs_dir2_dataptr_t dot_offset;
710 xfs_dir2_dataptr_t dotdot_offset;
711 xfs_ino_t ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712
713 mp = dp->i_mount;
714
715 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
716 /*
717 * Give up if the directory is way too short.
718 */
719 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
720 ASSERT(XFS_FORCED_SHUTDOWN(mp));
721 return XFS_ERROR(EIO);
722 }
723
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
725 ASSERT(dp->i_df.if_u1.if_data != NULL);
726
727 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
728
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000729 ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730
731 /*
732 * If the block number in the offset is out of range, we're done.
733 */
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000734 if (xfs_dir2_dataptr_to_db(mp, *offset) > mp->m_dirdatablk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736
737 /*
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000738 * Precalculate offsets for . and .. as we will always need them.
739 *
740 * XXX(hch): the second argument is sometimes 0 and sometimes
741 * mp->m_dirdatablk.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 */
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000743 dot_offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
744 XFS_DIR2_DATA_DOT_OFFSET);
745 dotdot_offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
746 XFS_DIR2_DATA_DOTDOT_OFFSET);
747
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 /*
749 * Put . entry unless we're starting past it.
750 */
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000751 if (*offset <= dot_offset) {
Christoph Hellwiga19d9f82009-03-29 09:51:08 +0200752 if (filldir(dirent, ".", 1, dot_offset & 0x7fffffff, dp->i_ino, DT_DIR)) {
Christoph Hellwig15440312009-01-08 14:00:00 -0500753 *offset = dot_offset & 0x7fffffff;
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000754 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 }
756 }
757
758 /*
759 * Put .. entry unless we're starting past it.
760 */
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000761 if (*offset <= dotdot_offset) {
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000762 ino = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);
Christoph Hellwig15440312009-01-08 14:00:00 -0500763 if (filldir(dirent, "..", 2, dotdot_offset & 0x7fffffff, ino, DT_DIR)) {
764 *offset = dotdot_offset & 0x7fffffff;
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000765 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 }
767 }
768
769 /*
770 * Loop while there are more entries and put'ing works.
771 */
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000772 sfep = xfs_dir2_sf_firstentry(sfp);
773 for (i = 0; i < sfp->hdr.count; i++) {
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000774 off = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
775 xfs_dir2_sf_get_offset(sfep));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000777 if (*offset > off) {
778 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 }
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000781
782 ino = xfs_dir2_sf_get_inumber(sfp, xfs_dir2_sf_inumberp(sfep));
Dave Chinner4a24cb72010-01-20 10:48:05 +1100783 if (filldir(dirent, (char *)sfep->name, sfep->namelen,
Christoph Hellwig15440312009-01-08 14:00:00 -0500784 off & 0x7fffffff, ino, DT_UNKNOWN)) {
785 *offset = off & 0x7fffffff;
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000786 return 0;
787 }
788 sfep = xfs_dir2_sf_nextentry(sfp, sfep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 }
790
Christoph Hellwig15440312009-01-08 14:00:00 -0500791 *offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk + 1, 0) &
792 0x7fffffff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 return 0;
794}
795
796/*
797 * Lookup an entry in a shortform directory.
798 * Returns EEXIST if found, ENOENT if not found.
799 */
800int /* error */
801xfs_dir2_sf_lookup(
802 xfs_da_args_t *args) /* operation arguments */
803{
804 xfs_inode_t *dp; /* incore directory inode */
805 int i; /* entry index */
Barry Naujok384f3ce2008-05-21 16:58:22 +1000806 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
808 xfs_dir2_sf_t *sfp; /* shortform structure */
Barry Naujok5163f952008-05-21 16:41:01 +1000809 enum xfs_dacmp cmp; /* comparison result */
Barry Naujok384f3ce2008-05-21 16:58:22 +1000810 xfs_dir2_sf_entry_t *ci_sfep; /* case-insens. entry */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811
Christoph Hellwig0b1b2132009-12-14 23:14:59 +0000812 trace_xfs_dir2_sf_lookup(args);
813
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 xfs_dir2_sf_check(args);
815 dp = args->dp;
816
817 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
818 /*
819 * Bail out if the directory is way too short.
820 */
821 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
822 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
823 return XFS_ERROR(EIO);
824 }
825 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
826 ASSERT(dp->i_df.if_u1.if_data != NULL);
827 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000828 ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 /*
830 * Special case for .
831 */
832 if (args->namelen == 1 && args->name[0] == '.') {
833 args->inumber = dp->i_ino;
Barry Naujok5163f952008-05-21 16:41:01 +1000834 args->cmpresult = XFS_CMP_EXACT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 return XFS_ERROR(EEXIST);
836 }
837 /*
838 * Special case for ..
839 */
840 if (args->namelen == 2 &&
841 args->name[0] == '.' && args->name[1] == '.') {
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000842 args->inumber = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);
Barry Naujok5163f952008-05-21 16:41:01 +1000843 args->cmpresult = XFS_CMP_EXACT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844 return XFS_ERROR(EEXIST);
845 }
846 /*
847 * Loop over all the entries trying to match ours.
848 */
Barry Naujok384f3ce2008-05-21 16:58:22 +1000849 ci_sfep = NULL;
Barry Naujok5163f952008-05-21 16:41:01 +1000850 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->hdr.count;
851 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
852 /*
853 * Compare name and if it's an exact match, return the inode
854 * number. If it's the first case-insensitive match, store the
855 * inode number and continue looking for an exact match.
856 */
857 cmp = dp->i_mount->m_dirnameops->compname(args, sfep->name,
858 sfep->namelen);
859 if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
860 args->cmpresult = cmp;
861 args->inumber = xfs_dir2_sf_get_inumber(sfp,
862 xfs_dir2_sf_inumberp(sfep));
863 if (cmp == XFS_CMP_EXACT)
864 return XFS_ERROR(EEXIST);
Barry Naujok384f3ce2008-05-21 16:58:22 +1000865 ci_sfep = sfep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 }
867 }
Barry Naujok6a178102008-05-21 16:42:05 +1000868 ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
Barry Naujok5163f952008-05-21 16:41:01 +1000869 /*
870 * Here, we can only be doing a lookup (not a rename or replace).
Barry Naujok384f3ce2008-05-21 16:58:22 +1000871 * If a case-insensitive match was not found, return ENOENT.
Barry Naujok5163f952008-05-21 16:41:01 +1000872 */
Barry Naujok384f3ce2008-05-21 16:58:22 +1000873 if (!ci_sfep)
874 return XFS_ERROR(ENOENT);
875 /* otherwise process the CI match as required by the caller */
876 error = xfs_dir_cilookup_result(args, ci_sfep->name, ci_sfep->namelen);
877 return XFS_ERROR(error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878}
879
880/*
881 * Remove an entry from a shortform directory.
882 */
883int /* error */
884xfs_dir2_sf_removename(
885 xfs_da_args_t *args)
886{
887 int byteoff; /* offset of removed entry */
888 xfs_inode_t *dp; /* incore directory inode */
889 int entsize; /* this entry's size */
890 int i; /* shortform entry index */
891 int newsize; /* new inode size */
892 int oldsize; /* old inode size */
893 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
894 xfs_dir2_sf_t *sfp; /* shortform structure */
895
Christoph Hellwig0b1b2132009-12-14 23:14:59 +0000896 trace_xfs_dir2_sf_removename(args);
897
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 dp = args->dp;
899
900 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
901 oldsize = (int)dp->i_d.di_size;
902 /*
903 * Bail out if the directory is way too short.
904 */
905 if (oldsize < offsetof(xfs_dir2_sf_hdr_t, parent)) {
906 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
907 return XFS_ERROR(EIO);
908 }
909 ASSERT(dp->i_df.if_bytes == oldsize);
910 ASSERT(dp->i_df.if_u1.if_data != NULL);
911 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000912 ASSERT(oldsize >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913 /*
914 * Loop over the old directory entries.
915 * Find the one we're deleting.
916 */
Barry Naujok5163f952008-05-21 16:41:01 +1000917 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->hdr.count;
918 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
919 if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
920 XFS_CMP_EXACT) {
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000921 ASSERT(xfs_dir2_sf_get_inumber(sfp,
Barry Naujok5163f952008-05-21 16:41:01 +1000922 xfs_dir2_sf_inumberp(sfep)) ==
923 args->inumber);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 break;
925 }
926 }
927 /*
928 * Didn't find it.
929 */
Barry Naujok5163f952008-05-21 16:41:01 +1000930 if (i == sfp->hdr.count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 return XFS_ERROR(ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 /*
933 * Calculate sizes.
934 */
935 byteoff = (int)((char *)sfep - (char *)sfp);
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000936 entsize = xfs_dir2_sf_entsize_byname(sfp, args->namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 newsize = oldsize - entsize;
938 /*
939 * Copy the part if any after the removed entry, sliding it down.
940 */
941 if (byteoff + entsize < oldsize)
942 memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize,
943 oldsize - (byteoff + entsize));
944 /*
945 * Fix up the header and file size.
946 */
947 sfp->hdr.count--;
948 dp->i_d.di_size = newsize;
949 /*
950 * Reallocate, making it smaller.
951 */
952 xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
953 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
954#if XFS_BIG_INUMS
955 /*
956 * Are we changing inode number size?
957 */
958 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
959 if (sfp->hdr.i8count == 1)
960 xfs_dir2_sf_toino4(args);
961 else
962 sfp->hdr.i8count--;
963 }
964#endif
965 xfs_dir2_sf_check(args);
966 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
967 return 0;
968}
969
970/*
971 * Replace the inode number of an entry in a shortform directory.
972 */
973int /* error */
974xfs_dir2_sf_replace(
975 xfs_da_args_t *args) /* operation arguments */
976{
977 xfs_inode_t *dp; /* incore directory inode */
978 int i; /* entry index */
979#if XFS_BIG_INUMS || defined(DEBUG)
980 xfs_ino_t ino=0; /* entry old inode number */
981#endif
982#if XFS_BIG_INUMS
983 int i8elevated; /* sf_toino8 set i8count=1 */
984#endif
985 xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
986 xfs_dir2_sf_t *sfp; /* shortform structure */
987
Christoph Hellwig0b1b2132009-12-14 23:14:59 +0000988 trace_xfs_dir2_sf_replace(args);
989
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 dp = args->dp;
991
992 ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
993 /*
994 * Bail out if the shortform directory is way too small.
995 */
996 if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
997 ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
998 return XFS_ERROR(EIO);
999 }
1000 ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
1001 ASSERT(dp->i_df.if_u1.if_data != NULL);
1002 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001003 ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004#if XFS_BIG_INUMS
1005 /*
1006 * New inode number is large, and need to convert to 8-byte inodes.
1007 */
1008 if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->hdr.i8count == 0) {
1009 int error; /* error return value */
1010 int newsize; /* new inode size */
1011
1012 newsize =
1013 dp->i_df.if_bytes +
1014 (sfp->hdr.count + 1) *
1015 ((uint)sizeof(xfs_dir2_ino8_t) -
1016 (uint)sizeof(xfs_dir2_ino4_t));
1017 /*
1018 * Won't fit as shortform, convert to block then do replace.
1019 */
1020 if (newsize > XFS_IFORK_DSIZE(dp)) {
1021 error = xfs_dir2_sf_to_block(args);
1022 if (error) {
1023 return error;
1024 }
1025 return xfs_dir2_block_replace(args);
1026 }
1027 /*
1028 * Still fits, convert to 8-byte now.
1029 */
1030 xfs_dir2_sf_toino8(args);
1031 i8elevated = 1;
1032 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1033 } else
1034 i8elevated = 0;
1035#endif
1036 ASSERT(args->namelen != 1 || args->name[0] != '.');
1037 /*
1038 * Replace ..'s entry.
1039 */
1040 if (args->namelen == 2 &&
1041 args->name[0] == '.' && args->name[1] == '.') {
1042#if XFS_BIG_INUMS || defined(DEBUG)
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001043 ino = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 ASSERT(args->inumber != ino);
1045#endif
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001046 xfs_dir2_sf_put_inumber(sfp, &args->inumber, &sfp->hdr.parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 }
1048 /*
1049 * Normal entry, look for the name.
1050 */
1051 else {
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001052 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
Barry Naujok5163f952008-05-21 16:41:01 +10001053 i < sfp->hdr.count;
1054 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
1055 if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
1056 XFS_CMP_EXACT) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057#if XFS_BIG_INUMS || defined(DEBUG)
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001058 ino = xfs_dir2_sf_get_inumber(sfp,
1059 xfs_dir2_sf_inumberp(sfep));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 ASSERT(args->inumber != ino);
1061#endif
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001062 xfs_dir2_sf_put_inumber(sfp, &args->inumber,
1063 xfs_dir2_sf_inumberp(sfep));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 break;
1065 }
1066 }
1067 /*
1068 * Didn't find it.
1069 */
1070 if (i == sfp->hdr.count) {
Barry Naujok6a178102008-05-21 16:42:05 +10001071 ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072#if XFS_BIG_INUMS
1073 if (i8elevated)
1074 xfs_dir2_sf_toino4(args);
1075#endif
1076 return XFS_ERROR(ENOENT);
1077 }
1078 }
1079#if XFS_BIG_INUMS
1080 /*
1081 * See if the old number was large, the new number is small.
1082 */
1083 if (ino > XFS_DIR2_MAX_SHORT_INUM &&
1084 args->inumber <= XFS_DIR2_MAX_SHORT_INUM) {
1085 /*
1086 * And the old count was one, so need to convert to small.
1087 */
1088 if (sfp->hdr.i8count == 1)
1089 xfs_dir2_sf_toino4(args);
1090 else
1091 sfp->hdr.i8count--;
1092 }
1093 /*
1094 * See if the old number was small, the new number is large.
1095 */
1096 if (ino <= XFS_DIR2_MAX_SHORT_INUM &&
1097 args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
1098 /*
1099 * add to the i8count unless we just converted to 8-byte
1100 * inodes (which does an implied i8count = 1)
1101 */
1102 ASSERT(sfp->hdr.i8count != 0);
1103 if (!i8elevated)
1104 sfp->hdr.i8count++;
1105 }
1106#endif
1107 xfs_dir2_sf_check(args);
1108 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
1109 return 0;
1110}
1111
1112#if XFS_BIG_INUMS
1113/*
1114 * Convert from 8-byte inode numbers to 4-byte inode numbers.
1115 * The last 8-byte inode number is gone, but the count is still 1.
1116 */
1117static void
1118xfs_dir2_sf_toino4(
1119 xfs_da_args_t *args) /* operation arguments */
1120{
1121 char *buf; /* old dir's buffer */
1122 xfs_inode_t *dp; /* incore directory inode */
1123 int i; /* entry index */
1124 xfs_ino_t ino; /* entry inode number */
1125 int newsize; /* new inode size */
1126 xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */
1127 xfs_dir2_sf_t *oldsfp; /* old sf directory */
1128 int oldsize; /* old inode size */
1129 xfs_dir2_sf_entry_t *sfep; /* new sf entry */
1130 xfs_dir2_sf_t *sfp; /* new sf directory */
1131
Christoph Hellwig0b1b2132009-12-14 23:14:59 +00001132 trace_xfs_dir2_sf_toino4(args);
1133
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134 dp = args->dp;
1135
1136 /*
1137 * Copy the old directory to the buffer.
1138 * Then nuke it from the inode, and add the new buffer to the inode.
1139 * Don't want xfs_idata_realloc copying the data here.
1140 */
1141 oldsize = dp->i_df.if_bytes;
1142 buf = kmem_alloc(oldsize, KM_SLEEP);
1143 oldsfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1144 ASSERT(oldsfp->hdr.i8count == 1);
1145 memcpy(buf, oldsfp, oldsize);
1146 /*
1147 * Compute the new inode size.
1148 */
1149 newsize =
1150 oldsize -
1151 (oldsfp->hdr.count + 1) *
1152 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
1153 xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1154 xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1155 /*
1156 * Reset our pointers, the data has moved.
1157 */
1158 oldsfp = (xfs_dir2_sf_t *)buf;
1159 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1160 /*
1161 * Fill in the new header.
1162 */
1163 sfp->hdr.count = oldsfp->hdr.count;
1164 sfp->hdr.i8count = 0;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001165 ino = xfs_dir2_sf_get_inumber(oldsfp, &oldsfp->hdr.parent);
1166 xfs_dir2_sf_put_inumber(sfp, &ino, &sfp->hdr.parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 /*
1168 * Copy the entries field by field.
1169 */
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001170 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1171 oldsfep = xfs_dir2_sf_firstentry(oldsfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 i < sfp->hdr.count;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001173 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep),
1174 oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 sfep->namelen = oldsfep->namelen;
1176 sfep->offset = oldsfep->offset;
1177 memcpy(sfep->name, oldsfep->name, sfep->namelen);
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001178 ino = xfs_dir2_sf_get_inumber(oldsfp,
1179 xfs_dir2_sf_inumberp(oldsfep));
1180 xfs_dir2_sf_put_inumber(sfp, &ino, xfs_dir2_sf_inumberp(sfep));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 }
1182 /*
1183 * Clean up the inode.
1184 */
Denys Vlasenkof0e2d932008-05-19 16:31:57 +10001185 kmem_free(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 dp->i_d.di_size = newsize;
1187 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1188}
1189
1190/*
1191 * Convert from 4-byte inode numbers to 8-byte inode numbers.
1192 * The new 8-byte inode number is not there yet, we leave with the
1193 * count 1 but no corresponding entry.
1194 */
1195static void
1196xfs_dir2_sf_toino8(
1197 xfs_da_args_t *args) /* operation arguments */
1198{
1199 char *buf; /* old dir's buffer */
1200 xfs_inode_t *dp; /* incore directory inode */
1201 int i; /* entry index */
1202 xfs_ino_t ino; /* entry inode number */
1203 int newsize; /* new inode size */
1204 xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */
1205 xfs_dir2_sf_t *oldsfp; /* old sf directory */
1206 int oldsize; /* old inode size */
1207 xfs_dir2_sf_entry_t *sfep; /* new sf entry */
1208 xfs_dir2_sf_t *sfp; /* new sf directory */
1209
Christoph Hellwig0b1b2132009-12-14 23:14:59 +00001210 trace_xfs_dir2_sf_toino8(args);
1211
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 dp = args->dp;
1213
1214 /*
1215 * Copy the old directory to the buffer.
1216 * Then nuke it from the inode, and add the new buffer to the inode.
1217 * Don't want xfs_idata_realloc copying the data here.
1218 */
1219 oldsize = dp->i_df.if_bytes;
1220 buf = kmem_alloc(oldsize, KM_SLEEP);
1221 oldsfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1222 ASSERT(oldsfp->hdr.i8count == 0);
1223 memcpy(buf, oldsfp, oldsize);
1224 /*
1225 * Compute the new inode size.
1226 */
1227 newsize =
1228 oldsize +
1229 (oldsfp->hdr.count + 1) *
1230 ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
1231 xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
1232 xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
1233 /*
1234 * Reset our pointers, the data has moved.
1235 */
1236 oldsfp = (xfs_dir2_sf_t *)buf;
1237 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
1238 /*
1239 * Fill in the new header.
1240 */
1241 sfp->hdr.count = oldsfp->hdr.count;
1242 sfp->hdr.i8count = 1;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001243 ino = xfs_dir2_sf_get_inumber(oldsfp, &oldsfp->hdr.parent);
1244 xfs_dir2_sf_put_inumber(sfp, &ino, &sfp->hdr.parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 /*
1246 * Copy the entries field by field.
1247 */
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001248 for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
1249 oldsfep = xfs_dir2_sf_firstentry(oldsfp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 i < sfp->hdr.count;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001251 i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep),
1252 oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 sfep->namelen = oldsfep->namelen;
1254 sfep->offset = oldsfep->offset;
1255 memcpy(sfep->name, oldsfep->name, sfep->namelen);
Christoph Hellwigbbaaf532007-06-28 16:43:50 +10001256 ino = xfs_dir2_sf_get_inumber(oldsfp,
1257 xfs_dir2_sf_inumberp(oldsfep));
1258 xfs_dir2_sf_put_inumber(sfp, &ino, xfs_dir2_sf_inumberp(sfep));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 }
1260 /*
1261 * Clean up the inode.
1262 */
Denys Vlasenkof0e2d932008-05-19 16:31:57 +10001263 kmem_free(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 dp->i_d.di_size = newsize;
1265 xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
1266}
1267#endif /* XFS_BIG_INUMS */