blob: dba7a71cedf3e6f903368416554730d9885142ad [file] [log] [blame]
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_dir2.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#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"
Nathan Scotta844f452005-11-02 14:38:42 +110031#include "xfs_alloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include "xfs_dir2_sf.h"
33#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_bmap.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include "xfs_dir2_data.h"
38#include "xfs_dir2_leaf.h"
39#include "xfs_dir2_block.h"
40#include "xfs_dir2_node.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include "xfs_error.h"
David Chinnera8272ce2007-11-23 16:28:09 +110042#include "xfs_vnodeops.h"
Christoph Hellwig0b1b2132009-12-14 23:14:59 +000043#include "xfs_trace.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
Dave Chinner4a24cb72010-01-20 10:48:05 +110045struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2};
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Barry Naujok189f4bf2008-05-21 16:58:55 +100047/*
48 * ASCII case-insensitive (ie. A-Z) support for directories that was
49 * used in IRIX.
50 */
51STATIC xfs_dahash_t
52xfs_ascii_ci_hashname(
53 struct xfs_name *name)
54{
55 xfs_dahash_t hash;
56 int i;
57
58 for (i = 0, hash = 0; i < name->len; i++)
59 hash = tolower(name->name[i]) ^ rol32(hash, 7);
60
61 return hash;
62}
63
64STATIC enum xfs_dacmp
65xfs_ascii_ci_compname(
66 struct xfs_da_args *args,
Dave Chinner2bc75422010-01-20 10:47:17 +110067 const unsigned char *name,
68 int len)
Barry Naujok189f4bf2008-05-21 16:58:55 +100069{
70 enum xfs_dacmp result;
71 int i;
72
73 if (args->namelen != len)
74 return XFS_CMP_DIFFERENT;
75
76 result = XFS_CMP_EXACT;
77 for (i = 0; i < len; i++) {
78 if (args->name[i] == name[i])
79 continue;
80 if (tolower(args->name[i]) != tolower(name[i]))
81 return XFS_CMP_DIFFERENT;
82 result = XFS_CMP_CASE;
83 }
84
85 return result;
86}
87
88static struct xfs_nameops xfs_ascii_ci_nameops = {
89 .hashname = xfs_ascii_ci_hashname,
90 .compname = xfs_ascii_ci_compname,
91};
92
Nathan Scottf6c2d1f2006-06-20 13:04:51 +100093void
94xfs_dir_mount(
95 xfs_mount_t *mp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070096{
Eric Sandeen62118702008-03-06 13:44:28 +110097 ASSERT(xfs_sb_version_hasdirv2(&mp->m_sb));
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <=
99 XFS_MAX_BLOCKSIZE);
100 mp->m_dirblksize = 1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog);
101 mp->m_dirblkfsbs = 1 << mp->m_sb.sb_dirblklog;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000102 mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp));
103 mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp));
104 mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 mp->m_attr_node_ents =
106 (mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) /
107 (uint)sizeof(xfs_da_node_entry_t);
108 mp->m_dir_node_ents =
109 (mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) /
110 (uint)sizeof(xfs_da_node_entry_t);
111 mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100;
Barry Naujok189f4bf2008-05-21 16:58:55 +1000112 if (xfs_sb_version_hasasciici(&mp->m_sb))
113 mp->m_dirnameops = &xfs_ascii_ci_nameops;
114 else
115 mp->m_dirnameops = &xfs_default_nameops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116}
117
118/*
119 * Return 1 if directory contains only "." and "..".
120 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000121int
122xfs_dir_isempty(
123 xfs_inode_t *dp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124{
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000125 xfs_dir2_sf_t *sfp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
127 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000128 if (dp->i_d.di_size == 0) /* might happen during shutdown. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
131 return 0;
132 sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
133 return !sfp->hdr.count;
134}
135
136/*
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000137 * Validate a given inode number.
138 */
139int
140xfs_dir_ino_validate(
141 xfs_mount_t *mp,
142 xfs_ino_t ino)
143{
144 xfs_agblock_t agblkno;
145 xfs_agino_t agino;
146 xfs_agnumber_t agno;
147 int ino_ok;
148 int ioff;
149
150 agno = XFS_INO_TO_AGNO(mp, ino);
151 agblkno = XFS_INO_TO_AGBNO(mp, ino);
152 ioff = XFS_INO_TO_OFFSET(mp, ino);
153 agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
154 ino_ok =
155 agno < mp->m_sb.sb_agcount &&
156 agblkno < mp->m_sb.sb_agblocks &&
157 agblkno != 0 &&
158 ioff < (1 << mp->m_sb.sb_inopblog) &&
159 XFS_AGINO_TO_INO(mp, agno, agino) == ino;
160 if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
161 XFS_RANDOM_DIR_INO_VALIDATE))) {
Dave Chinner53487782011-03-07 10:05:35 +1100162 xfs_warn(mp, "Invalid inode number 0x%Lx",
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000163 (unsigned long long) ino);
164 XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
165 return XFS_ERROR(EFSCORRUPTED);
166 }
167 return 0;
168}
169
170/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 * Initialize a directory with its "." and ".." entries.
172 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000173int
174xfs_dir_init(
175 xfs_trans_t *tp,
176 xfs_inode_t *dp,
177 xfs_inode_t *pdp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178{
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000179 xfs_da_args_t args;
180 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
182 memset((char *)&args, 0, sizeof(args));
183 args.dp = dp;
184 args.trans = tp;
185 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000186 if ((error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 return xfs_dir2_sf_create(&args, pdp->i_ino);
189}
190
191/*
192 Enter a name in a directory.
193 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000194int
195xfs_dir_createname(
196 xfs_trans_t *tp,
197 xfs_inode_t *dp,
Barry Naujok556b8b12008-04-10 12:22:07 +1000198 struct xfs_name *name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 xfs_ino_t inum, /* new entry inode number */
200 xfs_fsblock_t *first, /* bmap's firstblock */
201 xfs_bmap_free_t *flist, /* bmap's freeblock list */
202 xfs_extlen_t total) /* bmap's total block count */
203{
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000204 xfs_da_args_t args;
205 int rval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 int v; /* type-checking value */
207
208 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000209 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 return rval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 XFS_STATS_INC(xs_dir_create);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000212
Barry Naujok87affd082008-06-03 11:59:18 +1000213 memset(&args, 0, sizeof(xfs_da_args_t));
Barry Naujok556b8b12008-04-10 12:22:07 +1000214 args.name = name->name;
215 args.namelen = name->len;
Barry Naujok5163f952008-05-21 16:41:01 +1000216 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 args.inumber = inum;
218 args.dp = dp;
219 args.firstblock = first;
220 args.flist = flist;
221 args.total = total;
222 args.whichfork = XFS_DATA_FORK;
223 args.trans = tp;
Barry Naujok6a178102008-05-21 16:42:05 +1000224 args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
227 rval = xfs_dir2_sf_addname(&args);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000228 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000230 else if (v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 rval = xfs_dir2_block_addname(&args);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000232 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000234 else if (v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 rval = xfs_dir2_leaf_addname(&args);
236 else
237 rval = xfs_dir2_node_addname(&args);
238 return rval;
239}
240
241/*
Barry Naujok384f3ce2008-05-21 16:58:22 +1000242 * If doing a CI lookup and case-insensitive match, dup actual name into
243 * args.value. Return EEXIST for success (ie. name found) or an error.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000245int
Barry Naujok384f3ce2008-05-21 16:58:22 +1000246xfs_dir_cilookup_result(
247 struct xfs_da_args *args,
Dave Chinnera3380ae2010-01-20 10:47:25 +1100248 const unsigned char *name,
Barry Naujok384f3ce2008-05-21 16:58:22 +1000249 int len)
250{
251 if (args->cmpresult == XFS_CMP_DIFFERENT)
252 return ENOENT;
253 if (args->cmpresult != XFS_CMP_CASE ||
254 !(args->op_flags & XFS_DA_OP_CILOOKUP))
255 return EEXIST;
256
Christoph Hellwig3f52c2f2009-07-18 18:14:57 -0400257 args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL);
Barry Naujok384f3ce2008-05-21 16:58:22 +1000258 if (!args->value)
259 return ENOMEM;
260
261 memcpy(args->value, name, len);
262 args->valuelen = len;
263 return EEXIST;
264}
265
266/*
267 * Lookup a name in a directory, give back the inode number.
268 * If ci_name is not NULL, returns the actual name in ci_name if it differs
269 * to name, or ci_name->name is set to NULL for an exact match.
270 */
271
272int
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000273xfs_dir_lookup(
274 xfs_trans_t *tp,
275 xfs_inode_t *dp,
Barry Naujok556b8b12008-04-10 12:22:07 +1000276 struct xfs_name *name,
Barry Naujok384f3ce2008-05-21 16:58:22 +1000277 xfs_ino_t *inum, /* out: inode number */
278 struct xfs_name *ci_name) /* out: actual name if CI match */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279{
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000280 xfs_da_args_t args;
281 int rval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 int v; /* type-checking value */
283
284 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
285 XFS_STATS_INC(xs_dir_lookup);
286
Barry Naujok87affd082008-06-03 11:59:18 +1000287 memset(&args, 0, sizeof(xfs_da_args_t));
Barry Naujok556b8b12008-04-10 12:22:07 +1000288 args.name = name->name;
289 args.namelen = name->len;
Barry Naujok5163f952008-05-21 16:41:01 +1000290 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 args.dp = dp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 args.whichfork = XFS_DATA_FORK;
293 args.trans = tp;
Barry Naujok6a178102008-05-21 16:42:05 +1000294 args.op_flags = XFS_DA_OP_OKNOENT;
Barry Naujok384f3ce2008-05-21 16:58:22 +1000295 if (ci_name)
296 args.op_flags |= XFS_DA_OP_CILOOKUP;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000297
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
299 rval = xfs_dir2_sf_lookup(&args);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000300 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000302 else if (v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 rval = xfs_dir2_block_lookup(&args);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000304 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000306 else if (v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 rval = xfs_dir2_leaf_lookup(&args);
308 else
309 rval = xfs_dir2_node_lookup(&args);
310 if (rval == EEXIST)
311 rval = 0;
Barry Naujok384f3ce2008-05-21 16:58:22 +1000312 if (!rval) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 *inum = args.inumber;
Barry Naujok384f3ce2008-05-21 16:58:22 +1000314 if (ci_name) {
315 ci_name->name = args.value;
316 ci_name->len = args.valuelen;
317 }
318 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 return rval;
320}
321
322/*
323 * Remove an entry from a directory.
324 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000325int
326xfs_dir_removename(
327 xfs_trans_t *tp,
328 xfs_inode_t *dp,
Barry Naujok556b8b12008-04-10 12:22:07 +1000329 struct xfs_name *name,
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000330 xfs_ino_t ino,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 xfs_fsblock_t *first, /* bmap's firstblock */
332 xfs_bmap_free_t *flist, /* bmap's freeblock list */
333 xfs_extlen_t total) /* bmap's total block count */
334{
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000335 xfs_da_args_t args;
336 int rval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 int v; /* type-checking value */
338
339 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
340 XFS_STATS_INC(xs_dir_remove);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000341
Barry Naujok87affd082008-06-03 11:59:18 +1000342 memset(&args, 0, sizeof(xfs_da_args_t));
Barry Naujok556b8b12008-04-10 12:22:07 +1000343 args.name = name->name;
344 args.namelen = name->len;
Barry Naujok5163f952008-05-21 16:41:01 +1000345 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 args.inumber = ino;
347 args.dp = dp;
348 args.firstblock = first;
349 args.flist = flist;
350 args.total = total;
351 args.whichfork = XFS_DATA_FORK;
352 args.trans = tp;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000353
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
355 rval = xfs_dir2_sf_removename(&args);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000356 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000358 else if (v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 rval = xfs_dir2_block_removename(&args);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000360 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000362 else if (v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 rval = xfs_dir2_leaf_removename(&args);
364 else
365 rval = xfs_dir2_node_removename(&args);
366 return rval;
367}
368
369/*
370 * Read a directory.
371 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000372int
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000373xfs_readdir(
Christoph Hellwig993386c2007-08-28 16:12:30 +1000374 xfs_inode_t *dp,
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000375 void *dirent,
376 size_t bufsize,
377 xfs_off_t *offset,
378 filldir_t filldir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 int rval; /* return value */
381 int v; /* type-checking value */
382
Christoph Hellwigcca28fb2010-06-24 11:57:09 +1000383 trace_xfs_readdir(dp);
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000384
385 if (XFS_FORCED_SHUTDOWN(dp->i_mount))
386 return XFS_ERROR(EIO);
387
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
389 XFS_STATS_INC(xs_dir_getdents);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000392 rval = xfs_dir2_sf_getdents(dp, dirent, offset, filldir);
393 else if ((rval = xfs_dir2_isblock(NULL, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 ;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000395 else if (v)
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000396 rval = xfs_dir2_block_getdents(dp, dirent, offset, filldir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 else
Christoph Hellwig051e7cd2007-08-28 13:58:24 +1000398 rval = xfs_dir2_leaf_getdents(dp, dirent, bufsize, offset,
399 filldir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 return rval;
401}
402
403/*
404 * Replace the inode number of a directory entry.
405 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000406int
407xfs_dir_replace(
408 xfs_trans_t *tp,
409 xfs_inode_t *dp,
Barry Naujok556b8b12008-04-10 12:22:07 +1000410 struct xfs_name *name, /* name of entry to replace */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 xfs_ino_t inum, /* new inode number */
412 xfs_fsblock_t *first, /* bmap's firstblock */
413 xfs_bmap_free_t *flist, /* bmap's freeblock list */
414 xfs_extlen_t total) /* bmap's total block count */
415{
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000416 xfs_da_args_t args;
417 int rval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 int v; /* type-checking value */
419
420 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
421
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000422 if ((rval = xfs_dir_ino_validate(tp->t_mountp, inum)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000424
Barry Naujok87affd082008-06-03 11:59:18 +1000425 memset(&args, 0, sizeof(xfs_da_args_t));
Barry Naujok556b8b12008-04-10 12:22:07 +1000426 args.name = name->name;
427 args.namelen = name->len;
Barry Naujok5163f952008-05-21 16:41:01 +1000428 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 args.inumber = inum;
430 args.dp = dp;
431 args.firstblock = first;
432 args.flist = flist;
433 args.total = total;
434 args.whichfork = XFS_DATA_FORK;
435 args.trans = tp;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000436
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
438 rval = xfs_dir2_sf_replace(&args);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000439 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000441 else if (v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 rval = xfs_dir2_block_replace(&args);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000443 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000445 else if (v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 rval = xfs_dir2_leaf_replace(&args);
447 else
448 rval = xfs_dir2_node_replace(&args);
449 return rval;
450}
451
452/*
453 * See if this entry can be added to the directory without allocating space.
Barry Naujok556b8b12008-04-10 12:22:07 +1000454 * First checks that the caller couldn't reserve enough space (resblks = 0).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000456int
457xfs_dir_canenter(
458 xfs_trans_t *tp,
459 xfs_inode_t *dp,
Barry Naujok556b8b12008-04-10 12:22:07 +1000460 struct xfs_name *name, /* name of entry to add */
461 uint resblks)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462{
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000463 xfs_da_args_t args;
464 int rval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 int v; /* type-checking value */
466
Barry Naujok556b8b12008-04-10 12:22:07 +1000467 if (resblks)
468 return 0;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000469
Barry Naujok556b8b12008-04-10 12:22:07 +1000470 ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
Barry Naujok556b8b12008-04-10 12:22:07 +1000471
Barry Naujok87affd082008-06-03 11:59:18 +1000472 memset(&args, 0, sizeof(xfs_da_args_t));
Barry Naujok556b8b12008-04-10 12:22:07 +1000473 args.name = name->name;
474 args.namelen = name->len;
Barry Naujok5163f952008-05-21 16:41:01 +1000475 args.hashval = dp->i_mount->m_dirnameops->hashname(name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 args.dp = dp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 args.whichfork = XFS_DATA_FORK;
478 args.trans = tp;
Barry Naujok6a178102008-05-21 16:42:05 +1000479 args.op_flags = XFS_DA_OP_JUSTCHECK | XFS_DA_OP_ADDNAME |
480 XFS_DA_OP_OKNOENT;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000481
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL)
483 rval = xfs_dir2_sf_addname(&args);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000484 else if ((rval = xfs_dir2_isblock(tp, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000486 else if (v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 rval = xfs_dir2_block_addname(&args);
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000488 else if ((rval = xfs_dir2_isleaf(tp, dp, &v)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 return rval;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000490 else if (v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 rval = xfs_dir2_leaf_addname(&args);
492 else
493 rval = xfs_dir2_node_addname(&args);
494 return rval;
495}
496
497/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 * Utility routines.
499 */
500
501/*
502 * Add a block to the directory.
503 * This routine is for data and free blocks, not leaf/node blocks
504 * which are handled by xfs_da_grow_inode.
505 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000506int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507xfs_dir2_grow_inode(
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000508 xfs_da_args_t *args,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */
510 xfs_dir2_db_t *dbp) /* out: block number added */
511{
512 xfs_fileoff_t bno; /* directory offset of new block */
513 int count; /* count of filesystem blocks */
514 xfs_inode_t *dp; /* incore directory inode */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000515 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 int got; /* blocks actually mapped */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000517 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 xfs_bmbt_irec_t map; /* single structure for bmap */
519 int mapi; /* mapping index */
520 xfs_bmbt_irec_t *mapp; /* bmap mapping structure(s) */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000521 xfs_mount_t *mp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 int nmap; /* number of bmap entries */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000523 xfs_trans_t *tp;
David Chinnera7444052008-10-30 17:38:12 +1100524 xfs_drfsbno_t nblks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
Christoph Hellwig0b1b2132009-12-14 23:14:59 +0000526 trace_xfs_dir2_grow_inode(args, space);
527
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 dp = args->dp;
529 tp = args->trans;
530 mp = dp->i_mount;
David Chinnera7444052008-10-30 17:38:12 +1100531 nblks = dp->i_d.di_nblocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 /*
533 * Set lowest possible block in the space requested.
534 */
535 bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE);
536 count = mp->m_dirblkfsbs;
537 /*
538 * Find the first hole for our block.
539 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000540 if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, XFS_DATA_FORK)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 nmap = 1;
543 ASSERT(args->firstblock != NULL);
544 /*
545 * Try mapping the new block contiguously (one extent).
546 */
547 if ((error = xfs_bmapi(tp, dp, bno, count,
548 XFS_BMAPI_WRITE|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG,
549 args->firstblock, args->total, &map, &nmap,
Christoph Hellwigb4e91812010-06-23 18:11:15 +1000550 args->flist)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 ASSERT(nmap <= 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 if (nmap == 1) {
554 mapp = &map;
555 mapi = 1;
556 }
557 /*
558 * Didn't work and this is a multiple-fsb directory block.
559 * Try again with contiguous flag turned on.
560 */
561 else if (nmap == 0 && count > 1) {
562 xfs_fileoff_t b; /* current file offset */
563
564 /*
565 * Space for maximum number of mappings.
566 */
567 mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP);
568 /*
569 * Iterate until we get to the end of our block.
570 */
571 for (b = bno, mapi = 0; b < bno + count; ) {
572 int c; /* current fsb count */
573
574 /*
575 * Can't map more than MAX_NMAP at once.
576 */
577 nmap = MIN(XFS_BMAP_MAX_NMAP, count);
578 c = (int)(bno + count - b);
579 if ((error = xfs_bmapi(tp, dp, b, c,
580 XFS_BMAPI_WRITE|XFS_BMAPI_METADATA,
581 args->firstblock, args->total,
Christoph Hellwigb4e91812010-06-23 18:11:15 +1000582 &mapp[mapi], &nmap, args->flist))) {
Denys Vlasenkof0e2d932008-05-19 16:31:57 +1000583 kmem_free(mapp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 return error;
585 }
586 if (nmap < 1)
587 break;
588 /*
589 * Add this bunch into our table, go to the next offset.
590 */
591 mapi += nmap;
592 b = mapp[mapi - 1].br_startoff +
593 mapp[mapi - 1].br_blockcount;
594 }
595 }
596 /*
597 * Didn't work.
598 */
599 else {
600 mapi = 0;
601 mapp = NULL;
602 }
603 /*
604 * See how many fsb's we got.
605 */
606 for (i = 0, got = 0; i < mapi; i++)
607 got += mapp[i].br_blockcount;
608 /*
609 * Didn't get enough fsb's, or the first/last block's are wrong.
610 */
611 if (got != count || mapp[0].br_startoff != bno ||
612 mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount !=
613 bno + count) {
614 if (mapp != &map)
Denys Vlasenkof0e2d932008-05-19 16:31:57 +1000615 kmem_free(mapp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 return XFS_ERROR(ENOSPC);
617 }
618 /*
619 * Done with the temporary mapping table.
620 */
621 if (mapp != &map)
Denys Vlasenkof0e2d932008-05-19 16:31:57 +1000622 kmem_free(mapp);
David Chinnera7444052008-10-30 17:38:12 +1100623
624 /* account for newly allocated blocks in reserved blocks total */
625 args->total -= dp->i_d.di_nblocks - nblks;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000626 *dbp = xfs_dir2_da_to_db(mp, (xfs_dablk_t)bno);
David Chinnera7444052008-10-30 17:38:12 +1100627
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 /*
629 * Update file's size if this is the data space and it grew.
630 */
631 if (space == XFS_DIR2_DATA_SPACE) {
632 xfs_fsize_t size; /* directory file (data) size */
633
634 size = XFS_FSB_TO_B(mp, bno + count);
635 if (size > dp->i_d.di_size) {
636 dp->i_d.di_size = size;
637 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
638 }
639 }
640 return 0;
641}
642
643/*
644 * See if the directory is a single-block form directory.
645 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000646int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647xfs_dir2_isblock(
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000648 xfs_trans_t *tp,
649 xfs_inode_t *dp,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 int *vp) /* out: 1 is block, 0 is not block */
651{
652 xfs_fileoff_t last; /* last file offset */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000653 xfs_mount_t *mp;
654 int rval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655
656 mp = dp->i_mount;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000657 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 return rval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 rval = XFS_FSB_TO_B(mp, last) == mp->m_dirblksize;
660 ASSERT(rval == 0 || dp->i_d.di_size == mp->m_dirblksize);
661 *vp = rval;
662 return 0;
663}
664
665/*
666 * See if the directory is a single-leaf form directory.
667 */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000668int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669xfs_dir2_isleaf(
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000670 xfs_trans_t *tp,
671 xfs_inode_t *dp,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 int *vp) /* out: 1 is leaf, 0 is not leaf */
673{
674 xfs_fileoff_t last; /* last file offset */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000675 xfs_mount_t *mp;
676 int rval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677
678 mp = dp->i_mount;
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000679 if ((rval = xfs_bmap_last_offset(tp, dp, &last, XFS_DATA_FORK)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680 return rval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 *vp = last == mp->m_dirleafblk + (1 << mp->m_sb.sb_dirblklog);
682 return 0;
683}
684
685/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 * Remove the given block from the directory.
687 * This routine is used for data and free blocks, leaf/node are done
688 * by xfs_da_shrink_inode.
689 */
690int
691xfs_dir2_shrink_inode(
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000692 xfs_da_args_t *args,
693 xfs_dir2_db_t db,
694 xfs_dabuf_t *bp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695{
696 xfs_fileoff_t bno; /* directory file offset */
697 xfs_dablk_t da; /* directory file offset */
698 int done; /* bunmap is finished */
Nathan Scottf6c2d1f2006-06-20 13:04:51 +1000699 xfs_inode_t *dp;
700 int error;
701 xfs_mount_t *mp;
702 xfs_trans_t *tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703
Christoph Hellwig0b1b2132009-12-14 23:14:59 +0000704 trace_xfs_dir2_shrink_inode(args, db);
705
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 dp = args->dp;
707 mp = dp->i_mount;
708 tp = args->trans;
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000709 da = xfs_dir2_db_to_da(mp, db);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 /*
711 * Unmap the fsblock(s).
712 */
713 if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
714 XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
Christoph Hellwigb4e91812010-06-23 18:11:15 +1000715 &done))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 /*
717 * ENOSPC actually can happen if we're in a removename with
718 * no space reservation, and the resulting block removal
719 * would cause a bmap btree split or conversion from extents
720 * to btree. This can only happen for un-fragmented
721 * directory blocks, since you need to be punching out
722 * the middle of an extent.
723 * In this case we need to leave the block in the file,
724 * and not binval it.
725 * So the block has to be in a consistent empty state
726 * and appropriately logged.
727 * We don't free up the buffer, the caller can tell it
728 * hasn't happened since it got an error back.
729 */
730 return error;
731 }
732 ASSERT(done);
733 /*
734 * Invalidate the buffer from the transaction.
735 */
736 xfs_da_binval(tp, bp);
737 /*
738 * If it's not a data block, we're done.
739 */
740 if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
741 return 0;
742 /*
743 * If the block isn't the last one in the directory, we're done.
744 */
Christoph Hellwigbbaaf532007-06-28 16:43:50 +1000745 if (dp->i_d.di_size > xfs_dir2_db_off_to_byte(mp, db + 1, 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 return 0;
747 bno = da;
748 if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
749 /*
750 * This can't really happen unless there's kernel corruption.
751 */
752 return error;
753 }
754 if (db == mp->m_dirdatablk)
755 ASSERT(bno == 0);
756 else
757 ASSERT(bno > 0);
758 /*
759 * Set the size to the new last block.
760 */
761 dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
762 xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
763 return 0;
764}