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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000-2001,2005 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"
Nathan Scotta844f452005-11-02 14:38:42 +110021#include "xfs_bit.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include "xfs_log.h"
Nathan Scotta844f452005-11-02 14:38:42 +110023#include "xfs_inum.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include "xfs_trans.h"
25#include "xfs_sb.h"
26#include "xfs_ag.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"
Nathan Scotta844f452005-11-02 14:38:42 +110030#include "xfs_alloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#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_bmap.h"
Christoph Hellwig57926642011-07-13 13:43:48 +020035#include "xfs_dir2.h"
36#include "xfs_dir2_format.h"
37#include "xfs_dir2_priv.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include "xfs_error.h"
David Chinnera8272ce2007-11-23 16:28:09 +110039#include "xfs_vnodeops.h"
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000040#include "xfs_trace.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Dave Chinner4a24cb72010-01-20 10:48:05 +110042struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2};
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
Barry Naujok189f4bf2008-05-21 16:58:55 +100044/*
45 * ASCII case-insensitive (ie. A-Z) support for directories that was
46 * used in IRIX.
47 */
48STATIC xfs_dahash_t
49xfs_ascii_ci_hashname(
50 struct xfs_name *name)
51{
52 xfs_dahash_t hash;
53 int i;
54
55 for (i = 0, hash = 0; i < name->len; i++)
56 hash = tolower(name->name[i]) ^ rol32(hash, 7);
57
58 return hash;
59}
60
61STATIC enum xfs_dacmp
62xfs_ascii_ci_compname(
63 struct xfs_da_args *args,
Dave Chinner2bc75422010-01-20 10:47:17 +110064 const unsigned char *name,
65 int len)
Barry Naujok189f4bf2008-05-21 16:58:55 +100066{
67 enum xfs_dacmp result;
68 int i;
69
70 if (args->namelen != len)
71 return XFS_CMP_DIFFERENT;
72
73 result = XFS_CMP_EXACT;
74 for (i = 0; i < len; i++) {
75 if (args->name[i] == name[i])
76 continue;
77 if (tolower(args->name[i]) != tolower(name[i]))
78 return XFS_CMP_DIFFERENT;
79 result = XFS_CMP_CASE;
80 }
81
82 return result;
83}
84
85static struct xfs_nameops xfs_ascii_ci_nameops = {
86 .hashname = xfs_ascii_ci_hashname,
87 .compname = xfs_ascii_ci_compname,
88};
89
Nathan Scottf6c2d1f2006-06-20 13:04:51 +100090void
91xfs_dir_mount(
92 xfs_mount_t *mp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093{
Eric Sandeen62118702008-03-06 13:44:28 +110094 ASSERT(xfs_sb_version_hasdirv2(&mp->m_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
96 XFS_MAX_BLOCKSIZE);
97 mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
98 mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +100099 mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
100 mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
101 mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 mp->m_attr_node_ents =
103 (mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) /
104 (uint)sizeof(xfs_da_node_entry_t);
105 mp->m_dir_node_ents =
106 (mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
107 (uint)sizeof(xfs_da_node_entry_t);
108 mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
Barry Naujok189f4bf2008-05-21 16:58:55 +1000109 if (xfs_sb_version_hasasciici(&mp->m_sb))
110 mp->m_dirnameops = &xfs_ascii_ci_nameops;
111 else
112 mp->m_dirnameops = &xfs_default_nameops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113}
114
115/*
116 * Return 1 if directory contains only "." and "..".
117 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000118int
119xfs_dir_isempty(
120 xfs_inode_t *dp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121{
Christoph Hellwigac8ba502011-07-08 14:35:13 +0200122 xfs_dir2_sf_hdr_t *sfp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
124 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000125 if (dp->i_d.di_size == 0) /* might happen during shutdown. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
128 return 0;
Christoph Hellwigac8ba502011-07-08 14:35:13 +0200129 sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
130 return !sfp->count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131}
132
133/*
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000134 * Validate a given inode number.
135 */
136int
137xfs_dir_ino_validate(
138 xfs_mount_t *mp,
139 xfs_ino_t ino)
140{
141 xfs_agblock_t agblkno;
142 xfs_agino_t agino;
143 xfs_agnumber_t agno;
144 int ino_ok;
145 int ioff;
146
147 agno = XFS_INO_TO_AGNO(mp, ino);
148 agblkno = XFS_INO_TO_AGBNO(mp, ino);
149 ioff = XFS_INO_TO_OFFSET(mp, ino);
150 agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
151 ino_ok =
152 agno < mp->m_sb.sb_agcount &&
153 agblkno < mp->m_sb.sb_agblocks &&
154 agblkno != 0 &&
155 ioff < (1 << mp->m_sb.sb_inopblog) &&
156 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
157 if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
158 XFS_RANDOM_DIR_INO_VALIDATE))) {
Dave Chinner53487782011-03-07 10:05:35 +1100159 xfs_warn(mp, "Invalid inode number 0x%Lx",
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000160 (unsigned long long) ino);
161 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
162 return XFS_ERROR(EFSCORRUPTED);
163 }
164 return 0;
165}
166
167/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 * Initialize a directory with its "." and ".." entries.
169 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000170int
171xfs_dir_init(
172 xfs_trans_t *tp,
173 xfs_inode_t *dp,
174 xfs_inode_t *pdp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175{
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000176 xfs_da_args_t args;
177 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
179 memset((char *)&args, 0, sizeof(args));
180 args.dp = dp;
181 args.trans = tp;
182 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000183 if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 return xfs_dir2_sf_create(&args, pdp->i_ino);
186}
187
188/*
189 Enter a name in a directory.
190 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000191int
192xfs_dir_createname(
193 xfs_trans_t *tp,
194 xfs_inode_t *dp,
Barry Naujok556b8b12008-04-10 12:22:07 +1000195 struct xfs_name *name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 xfs_ino_t inum, /* new entry inode number */
197 xfs_fsblock_t *first, /* bmap's firstblock */
198 xfs_bmap_free_t *flist, /* bmap's freeblock list */
199 xfs_extlen_t total) /* bmap's total block count */
200{
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000201 xfs_da_args_t args;
202 int rval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 int v; /* type-checking value */
204
205 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000206 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 return rval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 XFS_STATS_INC(xs_dir_create);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000209
Barry Naujok87affd082008-06-03 11:59:18 +1000210 memset(&args, 0, sizeof(xfs_da_args_t));
Barry Naujok556b8b12008-04-10 12:22:07 +1000211 args.name = name->name;
212 args.namelen = name->len;
Barry Naujok5163f952008-05-21 16:41:01 +1000213 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 args.inumber = inum;
215 args.dp = dp;
216 args.firstblock = first;
217 args.flist = flist;
218 args.total = total;
219 args.whichfork = XFS_DATA_FORK;
220 args.trans = tp;
Barry Naujok6a178102008-05-21 16:42:05 +1000221 args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000222
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
224 rval = xfs_dir2_sf_addname(&args);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000225 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000227 else if (v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 rval = xfs_dir2_block_addname(&args);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000229 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000231 else if (v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 rval = xfs_dir2_leaf_addname(&args);
233 else
234 rval = xfs_dir2_node_addname(&args);
235 return rval;
236}
237
238/*
Barry Naujok384f3ce2008-05-21 16:58:22 +1000239 * If doing a CI lookup and case-insensitive match, dup actual name into
240 * args.value. Return EEXIST for success (ie. name found) or an error.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000242int
Barry Naujok384f3ce2008-05-21 16:58:22 +1000243xfs_dir_cilookup_result(
244 struct xfs_da_args *args,
Dave Chinnera3380ae2010-01-20 10:47:25 +1100245 const unsigned char *name,
Barry Naujok384f3ce2008-05-21 16:58:22 +1000246 int len)
247{
248 if (args->cmpresult == XFS_CMP_DIFFERENT)
249 return ENOENT;
250 if (args->cmpresult != XFS_CMP_CASE ||
251 !(args->op_flags & XFS_DA_OP_CILOOKUP))
252 return EEXIST;
253
Christoph Hellwig3f52c2f2009-07-18 18:14:57 -0400254 args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
Barry Naujok384f3ce2008-05-21 16:58:22 +1000255 if (!args->value)
256 return ENOMEM;
257
258 memcpy(args->value, name, len);
259 args->valuelen = len;
260 return EEXIST;
261}
262
263/*
264 * Lookup a name in a directory, give back the inode number.
265 * If ci_name is not NULL, returns the actual name in ci_name if it differs
266 * to name, or ci_name->name is set to NULL for an exact match.
267 */
268
269int
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000270xfs_dir_lookup(
271 xfs_trans_t *tp,
272 xfs_inode_t *dp,
Barry Naujok556b8b12008-04-10 12:22:07 +1000273 struct xfs_name *name,
Barry Naujok384f3ce2008-05-21 16:58:22 +1000274 xfs_ino_t *inum, /* out: inode number */
275 struct xfs_name *ci_name) /* out: actual name if CI match */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276{
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000277 xfs_da_args_t args;
278 int rval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 int v; /* type-checking value */
280
281 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
282 XFS_STATS_INC(xs_dir_lookup);
283
Barry Naujok87affd082008-06-03 11:59:18 +1000284 memset(&args, 0, sizeof(xfs_da_args_t));
Barry Naujok556b8b12008-04-10 12:22:07 +1000285 args.name = name->name;
286 args.namelen = name->len;
Barry Naujok5163f952008-05-21 16:41:01 +1000287 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 args.dp = dp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 args.whichfork = XFS_DATA_FORK;
290 args.trans = tp;
Barry Naujok6a178102008-05-21 16:42:05 +1000291 args.op_flags = XFS_DA_OP_OKNOENT;
Barry Naujok384f3ce2008-05-21 16:58:22 +1000292 if (ci_name)
293 args.op_flags |= XFS_DA_OP_CILOOKUP;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000294
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
296 rval = xfs_dir2_sf_lookup(&args);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000297 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000299 else if (v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 rval = xfs_dir2_block_lookup(&args);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000301 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000303 else if (v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 rval = xfs_dir2_leaf_lookup(&args);
305 else
306 rval = xfs_dir2_node_lookup(&args);
307 if (rval == EEXIST)
308 rval = 0;
Barry Naujok384f3ce2008-05-21 16:58:22 +1000309 if (!rval) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 *inum = args.inumber;
Barry Naujok384f3ce2008-05-21 16:58:22 +1000311 if (ci_name) {
312 ci_name->name = args.value;
313 ci_name->len = args.valuelen;
314 }
315 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 return rval;
317}
318
319/*
320 * Remove an entry from a directory.
321 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000322int
323xfs_dir_removename(
324 xfs_trans_t *tp,
325 xfs_inode_t *dp,
Barry Naujok556b8b12008-04-10 12:22:07 +1000326 struct xfs_name *name,
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000327 xfs_ino_t ino,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 xfs_fsblock_t *first, /* bmap's firstblock */
329 xfs_bmap_free_t *flist, /* bmap's freeblock list */
330 xfs_extlen_t total) /* bmap's total block count */
331{
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000332 xfs_da_args_t args;
333 int rval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 int v; /* type-checking value */
335
336 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
337 XFS_STATS_INC(xs_dir_remove);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000338
Barry Naujok87affd082008-06-03 11:59:18 +1000339 memset(&args, 0, sizeof(xfs_da_args_t));
Barry Naujok556b8b12008-04-10 12:22:07 +1000340 args.name = name->name;
341 args.namelen = name->len;
Barry Naujok5163f952008-05-21 16:41:01 +1000342 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 args.inumber = ino;
344 args.dp = dp;
345 args.firstblock = first;
346 args.flist = flist;
347 args.total = total;
348 args.whichfork = XFS_DATA_FORK;
349 args.trans = tp;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000350
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
352 rval = xfs_dir2_sf_removename(&args);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000353 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000355 else if (v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 rval = xfs_dir2_block_removename(&args);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000357 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000359 else if (v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 rval = xfs_dir2_leaf_removename(&args);
361 else
362 rval = xfs_dir2_node_removename(&args);
363 return rval;
364}
365
366/*
367 * Read a directory.
368 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000369int
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000370xfs_readdir(
Christoph Hellwig993386c12007-08-28 16:12:30 +1000371 xfs_inode_t *dp,
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000372 void *dirent,
373 size_t bufsize,
374 xfs_off_t *offset,
375 filldir_t filldir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 int rval; /* return value */
378 int v; /* type-checking value */
379
Christoph Hellwigcca28fb2010-06-24 11:57:09 +1000380 trace_xfs_readdir(dp);
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000381
382 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
383 return XFS_ERROR(EIO);
384
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
386 XFS_STATS_INC(xs_dir_getdents);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000389 rval = xfs_dir2_sf_getdents(dp, dirent, offset, filldir);
390 else if ((rval = xfs_dir2_isblock(NULL, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 ;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000392 else if (v)
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000393 rval = xfs_dir2_block_getdents(dp, dirent, offset, filldir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 else
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000395 rval = xfs_dir2_leaf_getdents(dp, dirent, bufsize, offset,
396 filldir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 return rval;
398}
399
400/*
401 * Replace the inode number of a directory entry.
402 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000403int
404xfs_dir_replace(
405 xfs_trans_t *tp,
406 xfs_inode_t *dp,
Barry Naujok556b8b12008-04-10 12:22:07 +1000407 struct xfs_name *name, /* name of entry to replace */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 xfs_ino_t inum, /* new inode number */
409 xfs_fsblock_t *first, /* bmap's firstblock */
410 xfs_bmap_free_t *flist, /* bmap's freeblock list */
411 xfs_extlen_t total) /* bmap's total block count */
412{
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000413 xfs_da_args_t args;
414 int rval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 int v; /* type-checking value */
416
417 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
418
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000419 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000421
Barry Naujok87affd082008-06-03 11:59:18 +1000422 memset(&args, 0, sizeof(xfs_da_args_t));
Barry Naujok556b8b12008-04-10 12:22:07 +1000423 args.name = name->name;
424 args.namelen = name->len;
Barry Naujok5163f952008-05-21 16:41:01 +1000425 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 args.inumber = inum;
427 args.dp = dp;
428 args.firstblock = first;
429 args.flist = flist;
430 args.total = total;
431 args.whichfork = XFS_DATA_FORK;
432 args.trans = tp;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000433
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
435 rval = xfs_dir2_sf_replace(&args);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000436 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000438 else if (v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 rval = xfs_dir2_block_replace(&args);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000440 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000442 else if (v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 rval = xfs_dir2_leaf_replace(&args);
444 else
445 rval = xfs_dir2_node_replace(&args);
446 return rval;
447}
448
449/*
450 * See if this entry can be added to the directory without allocating space.
Barry Naujok556b8b12008-04-10 12:22:07 +1000451 * First checks that the caller couldn't reserve enough space (resblks = 0).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000453int
454xfs_dir_canenter(
455 xfs_trans_t *tp,
456 xfs_inode_t *dp,
Barry Naujok556b8b12008-04-10 12:22:07 +1000457 struct xfs_name *name, /* name of entry to add */
458 uint resblks)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459{
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000460 xfs_da_args_t args;
461 int rval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 int v; /* type-checking value */
463
Barry Naujok556b8b12008-04-10 12:22:07 +1000464 if (resblks)
465 return 0;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000466
Barry Naujok556b8b12008-04-10 12:22:07 +1000467 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
Barry Naujok556b8b12008-04-10 12:22:07 +1000468
Barry Naujok87affd082008-06-03 11:59:18 +1000469 memset(&args, 0, sizeof(xfs_da_args_t));
Barry Naujok556b8b12008-04-10 12:22:07 +1000470 args.name = name->name;
471 args.namelen = name->len;
Barry Naujok5163f952008-05-21 16:41:01 +1000472 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 args.dp = dp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 args.whichfork = XFS_DATA_FORK;
475 args.trans = tp;
Barry Naujok6a178102008-05-21 16:42:05 +1000476 args.op_flags = XFS_DA_OP_JUSTCHECK | XFS_DA_OP_ADDNAME |
477 XFS_DA_OP_OKNOENT;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000478
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
480 rval = xfs_dir2_sf_addname(&args);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000481 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000483 else if (v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 rval = xfs_dir2_block_addname(&args);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000485 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000487 else if (v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 rval = xfs_dir2_leaf_addname(&args);
489 else
490 rval = xfs_dir2_node_addname(&args);
491 return rval;
492}
493
494/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 * Utility routines.
496 */
497
498/*
499 * Add a block to the directory.
500 * This routine is for data and free blocks, not leaf/node blocks
501 * which are handled by xfs_da_grow_inode.
502 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000503int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504xfs_dir2_grow_inode(
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000505 xfs_da_args_t *args,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
507 xfs_dir2_db_t *dbp) /* out: block number added */
508{
509 xfs_fileoff_t bno; /* directory offset of new block */
510 int count; /* count of filesystem blocks */
511 xfs_inode_t *dp; /* incore directory inode */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000512 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 int got; /* blocks actually mapped */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000514 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 xfs_bmbt_irec_t map; /* single structure for bmap */
516 int mapi; /* mapping index */
517 xfs_bmbt_irec_t *mapp; /* bmap mapping structure(s) */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000518 xfs_mount_t *mp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 int nmap; /* number of bmap entries */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000520 xfs_trans_t *tp;
David Chinnera7444052008-10-30 17:38:12 +1100521 xfs_drfsbno_t nblks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
Christoph Hellwig0b1b2132009-12-14 23:14:59 +0000523 trace_xfs_dir2_grow_inode(args, space);
524
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 dp = args->dp;
526 tp = args->trans;
527 mp = dp->i_mount;
David Chinnera7444052008-10-30 17:38:12 +1100528 nblks = dp->i_d.di_nblocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 /*
530 * Set lowest possible block in the space requested.
531 */
532 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
533 count = mp->m_dirblkfsbs;
534 /*
535 * Find the first hole for our block.
536 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000537 if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, XFS_DATA_FORK)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 nmap = 1;
540 ASSERT(args->firstblock != NULL);
541 /*
542 * Try mapping the new block contiguously (one extent).
543 */
544 if ((error = xfs_bmapi(tp, dp, bno, count,
545 XFS_BMAPI_WRITE|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG,
546 args->firstblock, args->total, &map, &nmap,
Christoph Hellwigb4e91812010-06-23 18:11:15 +1000547 args->flist)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 ASSERT(nmap <= 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 if (nmap == 1) {
551 mapp = &map;
552 mapi = 1;
553 }
554 /*
555 * Didn't work and this is a multiple-fsb directory block.
556 * Try again with contiguous flag turned on.
557 */
558 else if (nmap == 0 && count > 1) {
559 xfs_fileoff_t b; /* current file offset */
560
561 /*
562 * Space for maximum number of mappings.
563 */
564 mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP);
565 /*
566 * Iterate until we get to the end of our block.
567 */
568 for (b = bno, mapi = 0; b < bno + count; ) {
569 int c; /* current fsb count */
570
571 /*
572 * Can't map more than MAX_NMAP at once.
573 */
574 nmap = MIN(XFS_BMAP_MAX_NMAP, count);
575 c = (int)(bno + count - b);
576 if ((error = xfs_bmapi(tp, dp, b, c,
577 XFS_BMAPI_WRITE|XFS_BMAPI_METADATA,
578 args->firstblock, args->total,
Christoph Hellwigb4e91812010-06-23 18:11:15 +1000579 &mapp[mapi], &nmap, args->flist))) {
Denys Vlasenkof0e2d932008-05-19 16:31:57 +1000580 kmem_free(mapp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 return error;
582 }
583 if (nmap < 1)
584 break;
585 /*
586 * Add this bunch into our table, go to the next offset.
587 */
588 mapi += nmap;
589 b = mapp[mapi - 1].br_startoff +
590 mapp[mapi - 1].br_blockcount;
591 }
592 }
593 /*
594 * Didn't work.
595 */
596 else {
597 mapi = 0;
598 mapp = NULL;
599 }
600 /*
601 * See how many fsb's we got.
602 */
603 for (i = 0, got = 0; i < mapi; i++)
604 got += mapp[i].br_blockcount;
605 /*
606 * Didn't get enough fsb's, or the first/last block's are wrong.
607 */
608 if (got != count || mapp[0].br_startoff != bno ||
609 mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount !=
610 bno + count) {
611 if (mapp != &map)
Denys Vlasenkof0e2d932008-05-19 16:31:57 +1000612 kmem_free(mapp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 return XFS_ERROR(ENOSPC);
614 }
615 /*
616 * Done with the temporary mapping table.
617 */
618 if (mapp != &map)
Denys Vlasenkof0e2d932008-05-19 16:31:57 +1000619 kmem_free(mapp);
David Chinnera7444052008-10-30 17:38:12 +1100620
621 /* account for newly allocated blocks in reserved blocks total */
622 args->total -= dp->i_d.di_nblocks - nblks;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000623 *dbp = xfs_dir2_da_to_db(mp, (xfs_dablk_t)bno);
David Chinnera7444052008-10-30 17:38:12 +1100624
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 /*
626 * Update file's size if this is the data space and it grew.
627 */
628 if (space == XFS_DIR2_DATA_SPACE) {
629 xfs_fsize_t size; /* directory file (data) size */
630
631 size = XFS_FSB_TO_B(mp, bno + count);
632 if (size > dp->i_d.di_size) {
633 dp->i_d.di_size = size;
634 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
635 }
636 }
637 return 0;
638}
639
640/*
641 * See if the directory is a single-block form directory.
642 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000643int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644xfs_dir2_isblock(
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000645 xfs_trans_t *tp,
646 xfs_inode_t *dp,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 int *vp) /* out: 1 is block, 0 is not block */
648{
649 xfs_fileoff_t last; /* last file offset */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000650 xfs_mount_t *mp;
651 int rval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652
653 mp = dp->i_mount;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000654 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 return rval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
657 ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
658 *vp = rval;
659 return 0;
660}
661
662/*
663 * See if the directory is a single-leaf form directory.
664 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000665int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666xfs_dir2_isleaf(
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000667 xfs_trans_t *tp,
668 xfs_inode_t *dp,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 int *vp) /* out: 1 is leaf, 0 is not leaf */
670{
671 xfs_fileoff_t last; /* last file offset */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000672 xfs_mount_t *mp;
673 int rval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674
675 mp = dp->i_mount;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000676 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 return rval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
679 return 0;
680}
681
682/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 * Remove the given block from the directory.
684 * This routine is used for data and free blocks, leaf/node are done
685 * by xfs_da_shrink_inode.
686 */
687int
688xfs_dir2_shrink_inode(
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000689 xfs_da_args_t *args,
690 xfs_dir2_db_t db,
691 xfs_dabuf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692{
693 xfs_fileoff_t bno; /* directory file offset */
694 xfs_dablk_t da; /* directory file offset */
695 int done; /* bunmap is finished */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000696 xfs_inode_t *dp;
697 int error;
698 xfs_mount_t *mp;
699 xfs_trans_t *tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700
Christoph Hellwig0b1b2132009-12-14 23:14:59 +0000701 trace_xfs_dir2_shrink_inode(args, db);
702
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 dp = args->dp;
704 mp = dp->i_mount;
705 tp = args->trans;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000706 da = xfs_dir2_db_to_da(mp, db);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 /*
708 * Unmap the fsblock(s).
709 */
710 if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
711 XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
Christoph Hellwigb4e91812010-06-23 18:11:15 +1000712 &done))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 /*
714 * ENOSPC actually can happen if we're in a removename with
715 * no space reservation, and the resulting block removal
716 * would cause a bmap btree split or conversion from extents
717 * to btree. This can only happen for un-fragmented
718 * directory blocks, since you need to be punching out
719 * the middle of an extent.
720 * In this case we need to leave the block in the file,
721 * and not binval it.
722 * So the block has to be in a consistent empty state
723 * and appropriately logged.
724 * We don't free up the buffer, the caller can tell it
725 * hasn't happened since it got an error back.
726 */
727 return error;
728 }
729 ASSERT(done);
730 /*
731 * Invalidate the buffer from the transaction.
732 */
733 xfs_da_binval(tp, bp);
734 /*
735 * If it's not a data block, we're done.
736 */
737 if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
738 return 0;
739 /*
740 * If the block isn't the last one in the directory, we're done.
741 */
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000742 if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(mp, db + 1, 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 return 0;
744 bno = da;
745 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
746 /*
747 * This can't really happen unless there's kernel corruption.
748 */
749 return error;
750 }
751 if (db == mp->m_dirdatablk)
752 ASSERT(bno == 0);
753 else
754 ASSERT(bno > 0);
755 /*
756 * Set the size to the new last block.
757 */
758 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
759 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
760 return 0;
761}