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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/reiserfs/xattr.c | |
3 | * | |
4 | * Copyright (c) 2002 by Jeff Mahoney, <jeffm@suse.com> | |
5 | * | |
6 | */ | |
7 | ||
8 | /* | |
9 | * In order to implement EA/ACLs in a clean, backwards compatible manner, | |
10 | * they are implemented as files in a "private" directory. | |
11 | * Each EA is in it's own file, with the directory layout like so (/ is assumed | |
12 | * to be relative to fs root). Inside the /.reiserfs_priv/xattrs directory, | |
13 | * directories named using the capital-hex form of the objectid and | |
14 | * generation number are used. Inside each directory are individual files | |
15 | * named with the name of the extended attribute. | |
16 | * | |
17 | * So, for objectid 12648430, we could have: | |
18 | * /.reiserfs_priv/xattrs/C0FFEE.0/system.posix_acl_access | |
19 | * /.reiserfs_priv/xattrs/C0FFEE.0/system.posix_acl_default | |
20 | * /.reiserfs_priv/xattrs/C0FFEE.0/user.Content-Type | |
21 | * .. or similar. | |
22 | * | |
23 | * The file contents are the text of the EA. The size is known based on the | |
24 | * stat data describing the file. | |
25 | * | |
26 | * In the case of system.posix_acl_access and system.posix_acl_default, since | |
27 | * these are special cases for filesystem ACLs, they are interpreted by the | |
28 | * kernel, in addition, they are negatively and positively cached and attached | |
29 | * to the inode so that unnecessary lookups are avoided. | |
d984561b JM |
30 | * |
31 | * Locking works like so: | |
8b6dd72a JM |
32 | * Directory components (xattr root, xattr dir) are protectd by their i_mutex. |
33 | * The xattrs themselves are protected by the xattr_sem. | |
1da177e4 LT |
34 | */ |
35 | ||
f466c6fd | 36 | #include "reiserfs.h" |
16f7e0fe | 37 | #include <linux/capability.h> |
1da177e4 LT |
38 | #include <linux/dcache.h> |
39 | #include <linux/namei.h> | |
40 | #include <linux/errno.h> | |
5a0e3ad6 | 41 | #include <linux/gfp.h> |
1da177e4 LT |
42 | #include <linux/fs.h> |
43 | #include <linux/file.h> | |
44 | #include <linux/pagemap.h> | |
45 | #include <linux/xattr.h> | |
c45ac888 | 46 | #include "xattr.h" |
a3063ab8 | 47 | #include "acl.h" |
17093991 | 48 | #include <linux/uaccess.h> |
3277c39f | 49 | #include <net/checksum.h> |
1da177e4 | 50 | #include <linux/stat.h> |
6c17675e | 51 | #include <linux/quotaops.h> |
431547b3 | 52 | #include <linux/security.h> |
47f70d08 | 53 | #include <linux/posix_acl_xattr.h> |
1da177e4 | 54 | |
1da177e4 LT |
55 | #define PRIVROOT_NAME ".reiserfs_priv" |
56 | #define XAROOT_NAME "xattrs" | |
57 | ||
1da177e4 | 58 | |
098297b2 JM |
59 | /* |
60 | * Helpers for inode ops. We do this so that we don't have all the VFS | |
6c17675e | 61 | * overhead and also for proper i_mutex annotation. |
098297b2 JM |
62 | * dir->i_mutex must be held for all of them. |
63 | */ | |
3a355cc6 | 64 | #ifdef CONFIG_REISERFS_FS_XATTR |
6c17675e | 65 | static int xattr_create(struct inode *dir, struct dentry *dentry, int mode) |
1da177e4 | 66 | { |
6c17675e | 67 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
ebfc3b49 | 68 | return dir->i_op->create(dir, dentry, mode, true); |
6c17675e | 69 | } |
3a355cc6 | 70 | #endif |
bd4c625c | 71 | |
18bb1db3 | 72 | static int xattr_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
6c17675e JM |
73 | { |
74 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); | |
6c17675e JM |
75 | return dir->i_op->mkdir(dir, dentry, mode); |
76 | } | |
bd4c625c | 77 | |
098297b2 JM |
78 | /* |
79 | * We use I_MUTEX_CHILD here to silence lockdep. It's safe because xattr | |
6c17675e JM |
80 | * mutation ops aren't called during rename or splace, which are the |
81 | * only other users of I_MUTEX_CHILD. It violates the ordering, but that's | |
098297b2 JM |
82 | * better than allocating another subclass just for this code. |
83 | */ | |
6c17675e JM |
84 | static int xattr_unlink(struct inode *dir, struct dentry *dentry) |
85 | { | |
86 | int error; | |
f3fb9e27 | 87 | |
6c17675e | 88 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
bd4c625c | 89 | |
4c05141d | 90 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD); |
6c17675e JM |
91 | error = dir->i_op->unlink(dir, dentry); |
92 | mutex_unlock(&dentry->d_inode->i_mutex); | |
93 | ||
94 | if (!error) | |
95 | d_delete(dentry); | |
96 | return error; | |
97 | } | |
98 | ||
99 | static int xattr_rmdir(struct inode *dir, struct dentry *dentry) | |
100 | { | |
101 | int error; | |
f3fb9e27 | 102 | |
6c17675e | 103 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
6c17675e | 104 | |
4c05141d | 105 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD); |
6c17675e JM |
106 | error = dir->i_op->rmdir(dir, dentry); |
107 | if (!error) | |
108 | dentry->d_inode->i_flags |= S_DEAD; | |
109 | mutex_unlock(&dentry->d_inode->i_mutex); | |
110 | if (!error) | |
111 | d_delete(dentry); | |
6c17675e JM |
112 | |
113 | return error; | |
114 | } | |
115 | ||
6c17675e JM |
116 | #define xattr_may_create(flags) (!flags || flags & XATTR_CREATE) |
117 | ||
ab17c4f0 | 118 | static struct dentry *open_xa_root(struct super_block *sb, int flags) |
6c17675e | 119 | { |
ab17c4f0 JM |
120 | struct dentry *privroot = REISERFS_SB(sb)->priv_root; |
121 | struct dentry *xaroot; | |
f3fb9e27 | 122 | |
ab17c4f0 JM |
123 | if (!privroot->d_inode) |
124 | return ERR_PTR(-ENODATA); | |
6c17675e | 125 | |
ab17c4f0 | 126 | mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR); |
6c17675e | 127 | |
ab17c4f0 | 128 | xaroot = dget(REISERFS_SB(sb)->xattr_root); |
ceb5edc4 JM |
129 | if (!xaroot) |
130 | xaroot = ERR_PTR(-ENODATA); | |
131 | else if (!xaroot->d_inode) { | |
ab17c4f0 | 132 | int err = -ENODATA; |
f3fb9e27 | 133 | |
5a6059c3 | 134 | if (xattr_may_create(flags)) |
ab17c4f0 | 135 | err = xattr_mkdir(privroot->d_inode, xaroot, 0700); |
9b7f3755 | 136 | if (err) { |
ab17c4f0 JM |
137 | dput(xaroot); |
138 | xaroot = ERR_PTR(err); | |
9b7f3755 | 139 | } |
bd4c625c | 140 | } |
6c17675e | 141 | |
ab17c4f0 JM |
142 | mutex_unlock(&privroot->d_inode->i_mutex); |
143 | return xaroot; | |
1da177e4 LT |
144 | } |
145 | ||
bd4c625c | 146 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
1da177e4 | 147 | { |
bd4c625c LT |
148 | struct dentry *xaroot, *xadir; |
149 | char namebuf[17]; | |
150 | ||
6c17675e | 151 | xaroot = open_xa_root(inode->i_sb, flags); |
9b7f3755 | 152 | if (IS_ERR(xaroot)) |
bd4c625c | 153 | return xaroot; |
bd4c625c | 154 | |
bd4c625c LT |
155 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
156 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), | |
157 | inode->i_generation); | |
bd4c625c | 158 | |
ab17c4f0 JM |
159 | mutex_lock_nested(&xaroot->d_inode->i_mutex, I_MUTEX_XATTR); |
160 | ||
161 | xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf)); | |
162 | if (!IS_ERR(xadir) && !xadir->d_inode) { | |
163 | int err = -ENODATA; | |
f3fb9e27 | 164 | |
ab17c4f0 JM |
165 | if (xattr_may_create(flags)) |
166 | err = xattr_mkdir(xaroot->d_inode, xadir, 0700); | |
167 | if (err) { | |
168 | dput(xadir); | |
169 | xadir = ERR_PTR(err); | |
170 | } | |
171 | } | |
172 | ||
173 | mutex_unlock(&xaroot->d_inode->i_mutex); | |
bd4c625c LT |
174 | dput(xaroot); |
175 | return xadir; | |
1da177e4 LT |
176 | } |
177 | ||
098297b2 JM |
178 | /* |
179 | * The following are side effects of other operations that aren't explicitly | |
48b32a35 | 180 | * modifying extended attributes. This includes operations such as permissions |
098297b2 JM |
181 | * or ownership changes, object deletions, etc. |
182 | */ | |
a41f1a47 | 183 | struct reiserfs_dentry_buf { |
4acf381e | 184 | struct dir_context ctx; |
a41f1a47 JM |
185 | struct dentry *xadir; |
186 | int count; | |
187 | struct dentry *dentries[8]; | |
188 | }; | |
bd4c625c | 189 | |
a72bdb1c | 190 | static int |
a41f1a47 JM |
191 | fill_with_dentries(void *buf, const char *name, int namelen, loff_t offset, |
192 | u64 ino, unsigned int d_type) | |
a72bdb1c | 193 | { |
a41f1a47 | 194 | struct reiserfs_dentry_buf *dbuf = buf; |
a72bdb1c | 195 | struct dentry *dentry; |
f3fb9e27 | 196 | |
5a6059c3 | 197 | WARN_ON_ONCE(!mutex_is_locked(&dbuf->xadir->d_inode->i_mutex)); |
bd4c625c | 198 | |
a41f1a47 JM |
199 | if (dbuf->count == ARRAY_SIZE(dbuf->dentries)) |
200 | return -ENOSPC; | |
bd4c625c | 201 | |
35e5cbc0 JK |
202 | if (name[0] == '.' && (namelen < 2 || |
203 | (namelen == 2 && name[1] == '.'))) | |
a41f1a47 | 204 | return 0; |
bd4c625c | 205 | |
a41f1a47 | 206 | dentry = lookup_one_len(name, dbuf->xadir, namelen); |
a72bdb1c | 207 | if (IS_ERR(dentry)) { |
a41f1a47 | 208 | return PTR_ERR(dentry); |
a72bdb1c | 209 | } else if (!dentry->d_inode) { |
a41f1a47 JM |
210 | /* A directory entry exists, but no file? */ |
211 | reiserfs_error(dentry->d_sb, "xattr-20003", | |
212 | "Corrupted directory: xattr %s listed but " | |
213 | "not found for file %s.\n", | |
214 | dentry->d_name.name, dbuf->xadir->d_name.name); | |
215 | dput(dentry); | |
216 | return -EIO; | |
bd4c625c | 217 | } |
1da177e4 | 218 | |
a41f1a47 JM |
219 | dbuf->dentries[dbuf->count++] = dentry; |
220 | return 0; | |
1da177e4 LT |
221 | } |
222 | ||
a41f1a47 JM |
223 | static void |
224 | cleanup_dentry_buf(struct reiserfs_dentry_buf *buf) | |
1da177e4 | 225 | { |
a41f1a47 | 226 | int i; |
f3fb9e27 | 227 | |
a41f1a47 JM |
228 | for (i = 0; i < buf->count; i++) |
229 | if (buf->dentries[i]) | |
230 | dput(buf->dentries[i]); | |
a72bdb1c JM |
231 | } |
232 | ||
a41f1a47 JM |
233 | static int reiserfs_for_each_xattr(struct inode *inode, |
234 | int (*action)(struct dentry *, void *), | |
235 | void *data) | |
a72bdb1c | 236 | { |
a41f1a47 JM |
237 | struct dentry *dir; |
238 | int i, err = 0; | |
a41f1a47 | 239 | struct reiserfs_dentry_buf buf = { |
4acf381e | 240 | .ctx.actor = fill_with_dentries, |
a41f1a47 | 241 | }; |
1da177e4 | 242 | |
a72bdb1c JM |
243 | /* Skip out, an xattr has no xattrs associated with it */ |
244 | if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1) | |
245 | return 0; | |
1da177e4 | 246 | |
6c17675e | 247 | dir = open_xa_dir(inode, XATTR_REPLACE); |
a72bdb1c JM |
248 | if (IS_ERR(dir)) { |
249 | err = PTR_ERR(dir); | |
250 | goto out; | |
251 | } else if (!dir->d_inode) { | |
a41f1a47 JM |
252 | err = 0; |
253 | goto out_dir; | |
a72bdb1c | 254 | } |
1da177e4 | 255 | |
6c17675e | 256 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
27026a05 | 257 | |
a41f1a47 | 258 | buf.xadir = dir; |
cd62cdae AV |
259 | while (1) { |
260 | err = reiserfs_readdir_inode(dir->d_inode, &buf.ctx); | |
261 | if (err) | |
262 | break; | |
263 | if (!buf.count) | |
264 | break; | |
265 | for (i = 0; !err && i < buf.count && buf.dentries[i]; i++) { | |
a41f1a47 | 266 | struct dentry *dentry = buf.dentries[i]; |
1da177e4 | 267 | |
cd62cdae AV |
268 | if (!S_ISDIR(dentry->d_inode->i_mode)) |
269 | err = action(dentry, data); | |
1da177e4 | 270 | |
a41f1a47 JM |
271 | dput(dentry); |
272 | buf.dentries[i] = NULL; | |
bd4c625c | 273 | } |
cd62cdae AV |
274 | if (err) |
275 | break; | |
a41f1a47 | 276 | buf.count = 0; |
8b6dd72a | 277 | } |
a41f1a47 | 278 | mutex_unlock(&dir->d_inode->i_mutex); |
1da177e4 | 279 | |
a41f1a47 | 280 | cleanup_dentry_buf(&buf); |
1da177e4 | 281 | |
d984561b | 282 | if (!err) { |
098297b2 JM |
283 | /* |
284 | * We start a transaction here to avoid a ABBA situation | |
a41f1a47 JM |
285 | * between the xattr root's i_mutex and the journal lock. |
286 | * This doesn't incur much additional overhead since the | |
287 | * new transaction will just nest inside the | |
098297b2 JM |
288 | * outer transaction. |
289 | */ | |
a41f1a47 JM |
290 | int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + |
291 | 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); | |
292 | struct reiserfs_transaction_handle th; | |
f3fb9e27 | 293 | |
4c05141d | 294 | reiserfs_write_lock(inode->i_sb); |
a41f1a47 | 295 | err = journal_begin(&th, inode->i_sb, blocks); |
4c05141d | 296 | reiserfs_write_unlock(inode->i_sb); |
a41f1a47 JM |
297 | if (!err) { |
298 | int jerror; | |
f3fb9e27 | 299 | |
4c05141d JM |
300 | mutex_lock_nested(&dir->d_parent->d_inode->i_mutex, |
301 | I_MUTEX_XATTR); | |
a41f1a47 | 302 | err = action(dir, data); |
4c05141d | 303 | reiserfs_write_lock(inode->i_sb); |
58d85426 | 304 | jerror = journal_end(&th); |
4c05141d | 305 | reiserfs_write_unlock(inode->i_sb); |
a41f1a47 JM |
306 | mutex_unlock(&dir->d_parent->d_inode->i_mutex); |
307 | err = jerror ?: err; | |
308 | } | |
a72bdb1c | 309 | } |
a41f1a47 JM |
310 | out_dir: |
311 | dput(dir); | |
a72bdb1c | 312 | out: |
a41f1a47 JM |
313 | /* -ENODATA isn't an error */ |
314 | if (err == -ENODATA) | |
315 | err = 0; | |
a72bdb1c JM |
316 | return err; |
317 | } | |
1da177e4 | 318 | |
a41f1a47 | 319 | static int delete_one_xattr(struct dentry *dentry, void *data) |
a72bdb1c | 320 | { |
a41f1a47 | 321 | struct inode *dir = dentry->d_parent->d_inode; |
1da177e4 | 322 | |
a41f1a47 JM |
323 | /* This is the xattr dir, handle specially. */ |
324 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
325 | return xattr_rmdir(dir, dentry); | |
1da177e4 | 326 | |
a41f1a47 JM |
327 | return xattr_unlink(dir, dentry); |
328 | } | |
bd4c625c | 329 | |
a41f1a47 JM |
330 | static int chown_one_xattr(struct dentry *dentry, void *data) |
331 | { | |
332 | struct iattr *attrs = data; | |
4a857011 JM |
333 | int ia_valid = attrs->ia_valid; |
334 | int err; | |
335 | ||
336 | /* | |
337 | * We only want the ownership bits. Otherwise, we'll do | |
338 | * things like change a directory to a regular file if | |
339 | * ATTR_MODE is set. | |
340 | */ | |
341 | attrs->ia_valid &= (ATTR_UID|ATTR_GID); | |
342 | err = reiserfs_setattr(dentry, attrs); | |
343 | attrs->ia_valid = ia_valid; | |
344 | ||
345 | return err; | |
a41f1a47 | 346 | } |
1da177e4 | 347 | |
a41f1a47 JM |
348 | /* No i_mutex, but the inode is unconnected. */ |
349 | int reiserfs_delete_xattrs(struct inode *inode) | |
350 | { | |
351 | int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); | |
f3fb9e27 | 352 | |
a41f1a47 JM |
353 | if (err) |
354 | reiserfs_warning(inode->i_sb, "jdm-20004", | |
355 | "Couldn't delete all xattrs (%d)\n", err); | |
a72bdb1c JM |
356 | return err; |
357 | } | |
1da177e4 | 358 | |
a41f1a47 | 359 | /* inode->i_mutex: down */ |
a72bdb1c JM |
360 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
361 | { | |
a41f1a47 | 362 | int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); |
f3fb9e27 | 363 | |
8b6dd72a JM |
364 | if (err) |
365 | reiserfs_warning(inode->i_sb, "jdm-20007", | |
366 | "Couldn't chown all xattrs (%d)\n", err); | |
a72bdb1c | 367 | return err; |
1da177e4 LT |
368 | } |
369 | ||
a72bdb1c | 370 | #ifdef CONFIG_REISERFS_FS_XATTR |
098297b2 JM |
371 | /* |
372 | * Returns a dentry corresponding to a specific extended attribute file | |
a72bdb1c | 373 | * for the inode. If flags allow, the file is created. Otherwise, a |
098297b2 JM |
374 | * valid or negative dentry, or an error is returned. |
375 | */ | |
48b32a35 JM |
376 | static struct dentry *xattr_lookup(struct inode *inode, const char *name, |
377 | int flags) | |
1da177e4 | 378 | { |
a72bdb1c JM |
379 | struct dentry *xadir, *xafile; |
380 | int err = 0; | |
381 | ||
382 | xadir = open_xa_dir(inode, flags); | |
6c17675e | 383 | if (IS_ERR(xadir)) |
a72bdb1c | 384 | return ERR_CAST(xadir); |
a72bdb1c | 385 | |
5a6059c3 | 386 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
a72bdb1c JM |
387 | xafile = lookup_one_len(name, xadir, strlen(name)); |
388 | if (IS_ERR(xafile)) { | |
6c17675e JM |
389 | err = PTR_ERR(xafile); |
390 | goto out; | |
bd4c625c | 391 | } |
a72bdb1c | 392 | |
6c17675e JM |
393 | if (xafile->d_inode && (flags & XATTR_CREATE)) |
394 | err = -EEXIST; | |
a72bdb1c | 395 | |
6c17675e JM |
396 | if (!xafile->d_inode) { |
397 | err = -ENODATA; | |
5a6059c3 | 398 | if (xattr_may_create(flags)) |
6c17675e JM |
399 | err = xattr_create(xadir->d_inode, xafile, |
400 | 0700|S_IFREG); | |
a72bdb1c JM |
401 | } |
402 | ||
6c17675e JM |
403 | if (err) |
404 | dput(xafile); | |
a72bdb1c | 405 | out: |
5a6059c3 | 406 | mutex_unlock(&xadir->d_inode->i_mutex); |
a72bdb1c JM |
407 | dput(xadir); |
408 | if (err) | |
6c17675e | 409 | return ERR_PTR(err); |
a72bdb1c | 410 | return xafile; |
1da177e4 LT |
411 | } |
412 | ||
1da177e4 | 413 | /* Internal operations on file data */ |
bd4c625c | 414 | static inline void reiserfs_put_page(struct page *page) |
1da177e4 | 415 | { |
bd4c625c LT |
416 | kunmap(page); |
417 | page_cache_release(page); | |
1da177e4 LT |
418 | } |
419 | ||
ec6ea56b | 420 | static struct page *reiserfs_get_page(struct inode *dir, size_t n) |
1da177e4 | 421 | { |
bd4c625c LT |
422 | struct address_space *mapping = dir->i_mapping; |
423 | struct page *page; | |
098297b2 JM |
424 | /* |
425 | * We can deadlock if we try to free dentries, | |
426 | * and an unlink/rmdir has just occurred - GFP_NOFS avoids this | |
427 | */ | |
c4cdd038 | 428 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
ec6ea56b | 429 | page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL); |
bd4c625c | 430 | if (!IS_ERR(page)) { |
bd4c625c | 431 | kmap(page); |
bd4c625c LT |
432 | if (PageError(page)) |
433 | goto fail; | |
434 | } | |
435 | return page; | |
436 | ||
cf776a7a | 437 | fail: |
bd4c625c LT |
438 | reiserfs_put_page(page); |
439 | return ERR_PTR(-EIO); | |
1da177e4 LT |
440 | } |
441 | ||
bd4c625c | 442 | static inline __u32 xattr_hash(const char *msg, int len) |
1da177e4 | 443 | { |
bd4c625c | 444 | return csum_partial(msg, len, 0); |
1da177e4 LT |
445 | } |
446 | ||
ba9d8cec VS |
447 | int reiserfs_commit_write(struct file *f, struct page *page, |
448 | unsigned from, unsigned to); | |
ba9d8cec | 449 | |
48b32a35 JM |
450 | static void update_ctime(struct inode *inode) |
451 | { | |
452 | struct timespec now = current_fs_time(inode->i_sb); | |
f3fb9e27 | 453 | |
1d3382cb | 454 | if (inode_unhashed(inode) || !inode->i_nlink || |
48b32a35 JM |
455 | timespec_equal(&inode->i_ctime, &now)) |
456 | return; | |
457 | ||
458 | inode->i_ctime = CURRENT_TIME_SEC; | |
459 | mark_inode_dirty(inode); | |
460 | } | |
461 | ||
462 | static int lookup_and_delete_xattr(struct inode *inode, const char *name) | |
463 | { | |
464 | int err = 0; | |
465 | struct dentry *dentry, *xadir; | |
466 | ||
467 | xadir = open_xa_dir(inode, XATTR_REPLACE); | |
468 | if (IS_ERR(xadir)) | |
469 | return PTR_ERR(xadir); | |
470 | ||
5a6059c3 | 471 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
48b32a35 JM |
472 | dentry = lookup_one_len(name, xadir, strlen(name)); |
473 | if (IS_ERR(dentry)) { | |
474 | err = PTR_ERR(dentry); | |
475 | goto out_dput; | |
476 | } | |
477 | ||
478 | if (dentry->d_inode) { | |
48b32a35 | 479 | err = xattr_unlink(xadir->d_inode, dentry); |
48b32a35 JM |
480 | update_ctime(inode); |
481 | } | |
482 | ||
483 | dput(dentry); | |
484 | out_dput: | |
5a6059c3 | 485 | mutex_unlock(&xadir->d_inode->i_mutex); |
48b32a35 JM |
486 | dput(xadir); |
487 | return err; | |
488 | } | |
489 | ||
ba9d8cec | 490 | |
1da177e4 LT |
491 | /* Generic extended attribute operations that can be used by xa plugins */ |
492 | ||
493 | /* | |
1b1dcc1b | 494 | * inode->i_mutex: down |
1da177e4 LT |
495 | */ |
496 | int | |
0ab2621e JM |
497 | reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, |
498 | struct inode *inode, const char *name, | |
499 | const void *buffer, size_t buffer_size, int flags) | |
1da177e4 | 500 | { |
bd4c625c | 501 | int err = 0; |
3227e14c | 502 | struct dentry *dentry; |
bd4c625c LT |
503 | struct page *page; |
504 | char *data; | |
bd4c625c LT |
505 | size_t file_pos = 0; |
506 | size_t buffer_pos = 0; | |
48b32a35 | 507 | size_t new_size; |
bd4c625c LT |
508 | __u32 xahash = 0; |
509 | ||
bd4c625c LT |
510 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
511 | return -EOPNOTSUPP; | |
512 | ||
4f3be1b5 FW |
513 | if (!buffer) { |
514 | err = lookup_and_delete_xattr(inode, name); | |
4f3be1b5 FW |
515 | return err; |
516 | } | |
517 | ||
48b32a35 | 518 | dentry = xattr_lookup(inode, name, flags); |
4c05141d | 519 | if (IS_ERR(dentry)) |
48b32a35 | 520 | return PTR_ERR(dentry); |
3f14fea6 | 521 | |
f3e22f48 | 522 | down_write(&REISERFS_I(inode)->i_xattr_sem); |
bd4c625c | 523 | |
8b6dd72a | 524 | xahash = xattr_hash(buffer, buffer_size); |
bd4c625c LT |
525 | while (buffer_pos < buffer_size || buffer_pos == 0) { |
526 | size_t chunk; | |
527 | size_t skip = 0; | |
528 | size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1)); | |
f3fb9e27 | 529 | |
bd4c625c LT |
530 | if (buffer_size - buffer_pos > PAGE_CACHE_SIZE) |
531 | chunk = PAGE_CACHE_SIZE; | |
532 | else | |
533 | chunk = buffer_size - buffer_pos; | |
534 | ||
ec6ea56b | 535 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
536 | if (IS_ERR(page)) { |
537 | err = PTR_ERR(page); | |
48b32a35 | 538 | goto out_unlock; |
bd4c625c LT |
539 | } |
540 | ||
541 | lock_page(page); | |
542 | data = page_address(page); | |
543 | ||
544 | if (file_pos == 0) { | |
545 | struct reiserfs_xattr_header *rxh; | |
f3fb9e27 | 546 | |
bd4c625c LT |
547 | skip = file_pos = sizeof(struct reiserfs_xattr_header); |
548 | if (chunk + skip > PAGE_CACHE_SIZE) | |
549 | chunk = PAGE_CACHE_SIZE - skip; | |
550 | rxh = (struct reiserfs_xattr_header *)data; | |
551 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); | |
552 | rxh->h_hash = cpu_to_le32(xahash); | |
553 | } | |
554 | ||
4c05141d | 555 | reiserfs_write_lock(inode->i_sb); |
ebdec241 | 556 | err = __reiserfs_write_begin(page, page_offset, chunk + skip); |
bd4c625c LT |
557 | if (!err) { |
558 | if (buffer) | |
559 | memcpy(data + skip, buffer + buffer_pos, chunk); | |
3227e14c JM |
560 | err = reiserfs_commit_write(NULL, page, page_offset, |
561 | page_offset + chunk + | |
562 | skip); | |
bd4c625c | 563 | } |
4c05141d | 564 | reiserfs_write_unlock(inode->i_sb); |
bd4c625c LT |
565 | unlock_page(page); |
566 | reiserfs_put_page(page); | |
567 | buffer_pos += chunk; | |
568 | file_pos += chunk; | |
569 | skip = 0; | |
570 | if (err || buffer_size == 0 || !buffer) | |
571 | break; | |
572 | } | |
573 | ||
48b32a35 JM |
574 | new_size = buffer_size + sizeof(struct reiserfs_xattr_header); |
575 | if (!err && new_size < i_size_read(dentry->d_inode)) { | |
576 | struct iattr newattrs = { | |
577 | .ia_ctime = current_fs_time(inode->i_sb), | |
fb2162df | 578 | .ia_size = new_size, |
48b32a35 JM |
579 | .ia_valid = ATTR_SIZE | ATTR_CTIME, |
580 | }; | |
31370f62 | 581 | |
48b32a35 | 582 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR); |
bd5fe6c5 | 583 | inode_dio_wait(dentry->d_inode); |
31370f62 | 584 | |
48b32a35 | 585 | err = reiserfs_setattr(dentry, &newattrs); |
48b32a35 JM |
586 | mutex_unlock(&dentry->d_inode->i_mutex); |
587 | } else | |
588 | update_ctime(inode); | |
589 | out_unlock: | |
8b6dd72a | 590 | up_write(&REISERFS_I(inode)->i_xattr_sem); |
3227e14c | 591 | dput(dentry); |
48b32a35 JM |
592 | return err; |
593 | } | |
bd4c625c | 594 | |
0ab2621e JM |
595 | /* We need to start a transaction to maintain lock ordering */ |
596 | int reiserfs_xattr_set(struct inode *inode, const char *name, | |
597 | const void *buffer, size_t buffer_size, int flags) | |
48b32a35 | 598 | { |
0ab2621e JM |
599 | |
600 | struct reiserfs_transaction_handle th; | |
601 | int error, error2; | |
602 | size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size); | |
603 | ||
604 | if (!(flags & XATTR_REPLACE)) | |
605 | jbegin_count += reiserfs_xattr_jcreate_nblocks(inode); | |
606 | ||
607 | reiserfs_write_lock(inode->i_sb); | |
608 | error = journal_begin(&th, inode->i_sb, jbegin_count); | |
4c05141d | 609 | reiserfs_write_unlock(inode->i_sb); |
0ab2621e | 610 | if (error) { |
0ab2621e | 611 | return error; |
1da177e4 | 612 | } |
bd4c625c | 613 | |
0ab2621e JM |
614 | error = reiserfs_xattr_set_handle(&th, inode, name, |
615 | buffer, buffer_size, flags); | |
bd4c625c | 616 | |
4c05141d | 617 | reiserfs_write_lock(inode->i_sb); |
58d85426 | 618 | error2 = journal_end(&th); |
4c05141d | 619 | reiserfs_write_unlock(inode->i_sb); |
0ab2621e JM |
620 | if (error == 0) |
621 | error = error2; | |
0ab2621e JM |
622 | |
623 | return error; | |
1da177e4 LT |
624 | } |
625 | ||
626 | /* | |
1b1dcc1b | 627 | * inode->i_mutex: down |
1da177e4 LT |
628 | */ |
629 | int | |
48b32a35 | 630 | reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, |
bd4c625c | 631 | size_t buffer_size) |
1da177e4 | 632 | { |
bd4c625c | 633 | ssize_t err = 0; |
3227e14c | 634 | struct dentry *dentry; |
bd4c625c LT |
635 | size_t isize; |
636 | size_t file_pos = 0; | |
637 | size_t buffer_pos = 0; | |
638 | struct page *page; | |
bd4c625c LT |
639 | __u32 hash = 0; |
640 | ||
641 | if (name == NULL) | |
642 | return -EINVAL; | |
643 | ||
098297b2 JM |
644 | /* |
645 | * We can't have xattrs attached to v1 items since they don't have | |
646 | * generation numbers | |
647 | */ | |
bd4c625c LT |
648 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
649 | return -EOPNOTSUPP; | |
650 | ||
48b32a35 | 651 | dentry = xattr_lookup(inode, name, XATTR_REPLACE); |
3227e14c JM |
652 | if (IS_ERR(dentry)) { |
653 | err = PTR_ERR(dentry); | |
bd4c625c LT |
654 | goto out; |
655 | } | |
656 | ||
8b6dd72a | 657 | down_read(&REISERFS_I(inode)->i_xattr_sem); |
d984561b | 658 | |
f437c529 | 659 | isize = i_size_read(dentry->d_inode); |
bd4c625c LT |
660 | |
661 | /* Just return the size needed */ | |
662 | if (buffer == NULL) { | |
663 | err = isize - sizeof(struct reiserfs_xattr_header); | |
8b6dd72a | 664 | goto out_unlock; |
bd4c625c LT |
665 | } |
666 | ||
667 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { | |
668 | err = -ERANGE; | |
8b6dd72a | 669 | goto out_unlock; |
bd4c625c LT |
670 | } |
671 | ||
672 | while (file_pos < isize) { | |
673 | size_t chunk; | |
674 | char *data; | |
675 | size_t skip = 0; | |
f3fb9e27 | 676 | |
bd4c625c LT |
677 | if (isize - file_pos > PAGE_CACHE_SIZE) |
678 | chunk = PAGE_CACHE_SIZE; | |
679 | else | |
680 | chunk = isize - file_pos; | |
681 | ||
a72bdb1c | 682 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
683 | if (IS_ERR(page)) { |
684 | err = PTR_ERR(page); | |
8b6dd72a | 685 | goto out_unlock; |
bd4c625c LT |
686 | } |
687 | ||
688 | lock_page(page); | |
689 | data = page_address(page); | |
690 | if (file_pos == 0) { | |
691 | struct reiserfs_xattr_header *rxh = | |
692 | (struct reiserfs_xattr_header *)data; | |
693 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
694 | chunk -= skip; | |
695 | /* Magic doesn't match up.. */ | |
696 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { | |
697 | unlock_page(page); | |
698 | reiserfs_put_page(page); | |
a72bdb1c | 699 | reiserfs_warning(inode->i_sb, "jdm-20001", |
bd4c625c LT |
700 | "Invalid magic for xattr (%s) " |
701 | "associated with %k", name, | |
702 | INODE_PKEY(inode)); | |
703 | err = -EIO; | |
8b6dd72a | 704 | goto out_unlock; |
bd4c625c LT |
705 | } |
706 | hash = le32_to_cpu(rxh->h_hash); | |
707 | } | |
708 | memcpy(buffer + buffer_pos, data + skip, chunk); | |
709 | unlock_page(page); | |
710 | reiserfs_put_page(page); | |
711 | file_pos += chunk; | |
712 | buffer_pos += chunk; | |
713 | skip = 0; | |
714 | } | |
715 | err = isize - sizeof(struct reiserfs_xattr_header); | |
716 | ||
717 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != | |
718 | hash) { | |
a72bdb1c | 719 | reiserfs_warning(inode->i_sb, "jdm-20002", |
bd4c625c LT |
720 | "Invalid hash for xattr (%s) associated " |
721 | "with %k", name, INODE_PKEY(inode)); | |
722 | err = -EIO; | |
723 | } | |
724 | ||
8b6dd72a JM |
725 | out_unlock: |
726 | up_read(&REISERFS_I(inode)->i_xattr_sem); | |
3227e14c | 727 | dput(dentry); |
bd4c625c | 728 | |
a72bdb1c | 729 | out: |
bd4c625c | 730 | return err; |
1da177e4 LT |
731 | } |
732 | ||
48b32a35 JM |
733 | /* |
734 | * In order to implement different sets of xattr operations for each xattr | |
735 | * prefix with the generic xattr API, a filesystem should create a | |
736 | * null-terminated array of struct xattr_handler (one for each prefix) and | |
737 | * hang a pointer to it off of the s_xattr field of the superblock. | |
738 | * | |
739 | * The generic_fooxattr() functions will use this list to dispatch xattr | |
740 | * operations to the correct xattr_handler. | |
741 | */ | |
742 | #define for_each_xattr_handler(handlers, handler) \ | |
743 | for ((handler) = *(handlers)++; \ | |
744 | (handler) != NULL; \ | |
745 | (handler) = *(handlers)++) | |
1da177e4 | 746 | |
48b32a35 | 747 | /* This is the implementation for the xattr plugin infrastructure */ |
94d09a98 SH |
748 | static inline const struct xattr_handler * |
749 | find_xattr_handler_prefix(const struct xattr_handler **handlers, | |
48b32a35 | 750 | const char *name) |
1da177e4 | 751 | { |
94d09a98 | 752 | const struct xattr_handler *xah; |
bd4c625c | 753 | |
48b32a35 JM |
754 | if (!handlers) |
755 | return NULL; | |
bd4c625c | 756 | |
48b32a35 JM |
757 | for_each_xattr_handler(handlers, xah) { |
758 | if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0) | |
759 | break; | |
bd4c625c LT |
760 | } |
761 | ||
48b32a35 | 762 | return xah; |
bd4c625c | 763 | } |
1da177e4 | 764 | |
1da177e4 LT |
765 | |
766 | /* | |
767 | * Inode operation getxattr() | |
1da177e4 LT |
768 | */ |
769 | ssize_t | |
bd4c625c LT |
770 | reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, |
771 | size_t size) | |
1da177e4 | 772 | { |
94d09a98 | 773 | const struct xattr_handler *handler; |
bd4c625c | 774 | |
431547b3 | 775 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 776 | |
431547b3 | 777 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c LT |
778 | return -EOPNOTSUPP; |
779 | ||
431547b3 | 780 | return handler->get(dentry, name, buffer, size, handler->flags); |
1da177e4 LT |
781 | } |
782 | ||
1da177e4 LT |
783 | /* |
784 | * Inode operation setxattr() | |
785 | * | |
1b1dcc1b | 786 | * dentry->d_inode->i_mutex down |
1da177e4 LT |
787 | */ |
788 | int | |
bd4c625c LT |
789 | reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
790 | size_t size, int flags) | |
1da177e4 | 791 | { |
94d09a98 | 792 | const struct xattr_handler *handler; |
bd4c625c | 793 | |
431547b3 | 794 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 795 | |
431547b3 | 796 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c LT |
797 | return -EOPNOTSUPP; |
798 | ||
431547b3 | 799 | return handler->set(dentry, name, value, size, flags, handler->flags); |
1da177e4 LT |
800 | } |
801 | ||
802 | /* | |
803 | * Inode operation removexattr() | |
804 | * | |
1b1dcc1b | 805 | * dentry->d_inode->i_mutex down |
1da177e4 | 806 | */ |
bd4c625c | 807 | int reiserfs_removexattr(struct dentry *dentry, const char *name) |
1da177e4 | 808 | { |
94d09a98 | 809 | const struct xattr_handler *handler; |
f3fb9e27 | 810 | |
431547b3 | 811 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
1da177e4 | 812 | |
431547b3 | 813 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c | 814 | return -EOPNOTSUPP; |
1da177e4 | 815 | |
431547b3 | 816 | return handler->set(dentry, name, NULL, 0, XATTR_REPLACE, handler->flags); |
1da177e4 LT |
817 | } |
818 | ||
48b32a35 | 819 | struct listxattr_buf { |
4acf381e | 820 | struct dir_context ctx; |
48b32a35 JM |
821 | size_t size; |
822 | size_t pos; | |
823 | char *buf; | |
431547b3 | 824 | struct dentry *dentry; |
1da177e4 LT |
825 | }; |
826 | ||
48b32a35 JM |
827 | static int listxattr_filler(void *buf, const char *name, int namelen, |
828 | loff_t offset, u64 ino, unsigned int d_type) | |
1da177e4 | 829 | { |
48b32a35 JM |
830 | struct listxattr_buf *b = (struct listxattr_buf *)buf; |
831 | size_t size; | |
f3fb9e27 | 832 | |
48b32a35 JM |
833 | if (name[0] != '.' || |
834 | (namelen != 1 && (name[1] != '.' || namelen != 2))) { | |
94d09a98 | 835 | const struct xattr_handler *handler; |
f3fb9e27 | 836 | |
431547b3 | 837 | handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr, |
48b32a35 JM |
838 | name); |
839 | if (!handler) /* Unsupported xattr name */ | |
840 | return 0; | |
841 | if (b->buf) { | |
431547b3 CH |
842 | size = handler->list(b->dentry, b->buf + b->pos, |
843 | b->size, name, namelen, | |
844 | handler->flags); | |
48b32a35 JM |
845 | if (size > b->size) |
846 | return -ERANGE; | |
847 | } else { | |
431547b3 CH |
848 | size = handler->list(b->dentry, NULL, 0, name, |
849 | namelen, handler->flags); | |
bd4c625c | 850 | } |
bd4c625c | 851 | |
48b32a35 JM |
852 | b->pos += size; |
853 | } | |
bd4c625c | 854 | return 0; |
1da177e4 | 855 | } |
bd4c625c | 856 | |
1da177e4 LT |
857 | /* |
858 | * Inode operation listxattr() | |
859 | * | |
48b32a35 JM |
860 | * We totally ignore the generic listxattr here because it would be stupid |
861 | * not to. Since the xattrs are organized in a directory, we can just | |
862 | * readdir to find them. | |
1da177e4 | 863 | */ |
bd4c625c | 864 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
1da177e4 | 865 | { |
bd4c625c LT |
866 | struct dentry *dir; |
867 | int err = 0; | |
48b32a35 | 868 | struct listxattr_buf buf = { |
4acf381e | 869 | .ctx.actor = listxattr_filler, |
431547b3 | 870 | .dentry = dentry, |
48b32a35 JM |
871 | .buf = buffer, |
872 | .size = buffer ? size : 0, | |
873 | }; | |
bd4c625c LT |
874 | |
875 | if (!dentry->d_inode) | |
876 | return -EINVAL; | |
877 | ||
677c9b2e | 878 | if (!dentry->d_sb->s_xattr || |
bd4c625c LT |
879 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
880 | return -EOPNOTSUPP; | |
881 | ||
6c17675e | 882 | dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE); |
bd4c625c LT |
883 | if (IS_ERR(dir)) { |
884 | err = PTR_ERR(dir); | |
885 | if (err == -ENODATA) | |
48b32a35 | 886 | err = 0; /* Not an error if there aren't any xattrs */ |
bd4c625c LT |
887 | goto out; |
888 | } | |
889 | ||
6c17675e | 890 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
cd62cdae | 891 | err = reiserfs_readdir_inode(dir->d_inode, &buf.ctx); |
6c17675e | 892 | mutex_unlock(&dir->d_inode->i_mutex); |
bd4c625c | 893 | |
48b32a35 JM |
894 | if (!err) |
895 | err = buf.pos; | |
bd4c625c | 896 | |
3227e14c | 897 | dput(dir); |
8b6dd72a | 898 | out: |
bd4c625c | 899 | return err; |
1da177e4 LT |
900 | } |
901 | ||
a72bdb1c | 902 | static int create_privroot(struct dentry *dentry) |
1da177e4 | 903 | { |
a72bdb1c JM |
904 | int err; |
905 | struct inode *inode = dentry->d_parent->d_inode; | |
f3fb9e27 | 906 | |
5a6059c3 JM |
907 | WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex)); |
908 | ||
6c17675e | 909 | err = xattr_mkdir(inode, dentry, 0700); |
edcc37a0 AV |
910 | if (err || !dentry->d_inode) { |
911 | reiserfs_warning(dentry->d_sb, "jdm-20006", | |
912 | "xattrs/ACLs enabled and couldn't " | |
913 | "find/create .reiserfs_priv. " | |
914 | "Failing mount."); | |
915 | return -EOPNOTSUPP; | |
bd4c625c LT |
916 | } |
917 | ||
edcc37a0 AV |
918 | dentry->d_inode->i_flags |= S_PRIVATE; |
919 | reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr " | |
920 | "storage.\n", PRIVROOT_NAME); | |
bd4c625c | 921 | |
edcc37a0 | 922 | return 0; |
1da177e4 LT |
923 | } |
924 | ||
12abb35a JM |
925 | #else |
926 | int __init reiserfs_xattr_register_handlers(void) { return 0; } | |
927 | void reiserfs_xattr_unregister_handlers(void) {} | |
928 | static int create_privroot(struct dentry *dentry) { return 0; } | |
929 | #endif | |
930 | ||
931 | /* Actual operations that are exported to VFS-land */ | |
da02eb72 | 932 | static const struct xattr_handler *reiserfs_xattr_handlers[] = { |
12abb35a JM |
933 | #ifdef CONFIG_REISERFS_FS_XATTR |
934 | &reiserfs_xattr_user_handler, | |
935 | &reiserfs_xattr_trusted_handler, | |
936 | #endif | |
937 | #ifdef CONFIG_REISERFS_FS_SECURITY | |
938 | &reiserfs_xattr_security_handler, | |
939 | #endif | |
940 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL | |
47f70d08 CH |
941 | &posix_acl_access_xattr_handler, |
942 | &posix_acl_default_xattr_handler, | |
12abb35a JM |
943 | #endif |
944 | NULL | |
945 | }; | |
946 | ||
a72bdb1c | 947 | static int xattr_mount_check(struct super_block *s) |
1da177e4 | 948 | { |
098297b2 JM |
949 | /* |
950 | * We need generation numbers to ensure that the oid mapping is correct | |
951 | * v3.5 filesystems don't have them. | |
952 | */ | |
48b32a35 JM |
953 | if (old_format_only(s)) { |
954 | if (reiserfs_xattrs_optional(s)) { | |
098297b2 JM |
955 | /* |
956 | * Old format filesystem, but optional xattrs have | |
957 | * been enabled. Error out. | |
958 | */ | |
48b32a35 JM |
959 | reiserfs_warning(s, "jdm-2005", |
960 | "xattrs/ACLs not supported " | |
961 | "on pre-v3.6 format filesystems. " | |
962 | "Failing mount."); | |
963 | return -EOPNOTSUPP; | |
964 | } | |
a72bdb1c JM |
965 | } |
966 | ||
967 | return 0; | |
1da177e4 LT |
968 | } |
969 | ||
10556cb2 | 970 | int reiserfs_permission(struct inode *inode, int mask) |
b83674c0 JM |
971 | { |
972 | /* | |
973 | * We don't do permission checks on the internal objects. | |
974 | * Permissions are determined by the "owning" object. | |
975 | */ | |
976 | if (IS_PRIVATE(inode)) | |
977 | return 0; | |
978 | ||
2830ba7f | 979 | return generic_permission(inode, mask); |
b83674c0 JM |
980 | } |
981 | ||
0b728e19 | 982 | static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 983 | { |
cac36f70 | 984 | return -EPERM; |
1da177e4 LT |
985 | } |
986 | ||
e16404ed | 987 | static const struct dentry_operations xattr_lookup_poison_ops = { |
cac36f70 | 988 | .d_revalidate = xattr_hide_revalidate, |
1da177e4 LT |
989 | }; |
990 | ||
edcc37a0 AV |
991 | int reiserfs_lookup_privroot(struct super_block *s) |
992 | { | |
993 | struct dentry *dentry; | |
994 | int err = 0; | |
995 | ||
996 | /* If we don't have the privroot located yet - go find it */ | |
4c05141d | 997 | mutex_lock(&s->s_root->d_inode->i_mutex); |
edcc37a0 AV |
998 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, |
999 | strlen(PRIVROOT_NAME)); | |
1000 | if (!IS_ERR(dentry)) { | |
1001 | REISERFS_SB(s)->priv_root = dentry; | |
fb045adb | 1002 | d_set_d_op(dentry, &xattr_lookup_poison_ops); |
edcc37a0 AV |
1003 | if (dentry->d_inode) |
1004 | dentry->d_inode->i_flags |= S_PRIVATE; | |
1005 | } else | |
1006 | err = PTR_ERR(dentry); | |
1007 | mutex_unlock(&s->s_root->d_inode->i_mutex); | |
1008 | ||
1009 | return err; | |
1010 | } | |
1011 | ||
098297b2 JM |
1012 | /* |
1013 | * We need to take a copy of the mount flags since things like | |
1da177e4 | 1014 | * MS_RDONLY don't get set until *after* we're called. |
098297b2 JM |
1015 | * mount_flags != mount_options |
1016 | */ | |
bd4c625c | 1017 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
1da177e4 | 1018 | { |
bd4c625c | 1019 | int err = 0; |
ab17c4f0 | 1020 | struct dentry *privroot = REISERFS_SB(s)->priv_root; |
bd4c625c | 1021 | |
a72bdb1c JM |
1022 | err = xattr_mount_check(s); |
1023 | if (err) | |
bd4c625c | 1024 | goto error; |
bd4c625c | 1025 | |
ab17c4f0 | 1026 | if (!privroot->d_inode && !(mount_flags & MS_RDONLY)) { |
4c05141d | 1027 | mutex_lock(&s->s_root->d_inode->i_mutex); |
edcc37a0 | 1028 | err = create_privroot(REISERFS_SB(s)->priv_root); |
5a6059c3 | 1029 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
bd4c625c | 1030 | } |
ab17c4f0 JM |
1031 | |
1032 | if (privroot->d_inode) { | |
48b32a35 | 1033 | s->s_xattr = reiserfs_xattr_handlers; |
4c05141d | 1034 | mutex_lock(&privroot->d_inode->i_mutex); |
ab17c4f0 JM |
1035 | if (!REISERFS_SB(s)->xattr_root) { |
1036 | struct dentry *dentry; | |
f3fb9e27 | 1037 | |
ab17c4f0 JM |
1038 | dentry = lookup_one_len(XAROOT_NAME, privroot, |
1039 | strlen(XAROOT_NAME)); | |
1040 | if (!IS_ERR(dentry)) | |
1041 | REISERFS_SB(s)->xattr_root = dentry; | |
1042 | else | |
1043 | err = PTR_ERR(dentry); | |
1044 | } | |
1045 | mutex_unlock(&privroot->d_inode->i_mutex); | |
1046 | } | |
48b32a35 | 1047 | |
a72bdb1c | 1048 | error: |
bd4c625c | 1049 | if (err) { |
a228bf8f JM |
1050 | clear_bit(REISERFS_XATTRS_USER, &REISERFS_SB(s)->s_mount_opt); |
1051 | clear_bit(REISERFS_POSIXACL, &REISERFS_SB(s)->s_mount_opt); | |
bd4c625c LT |
1052 | } |
1053 | ||
1054 | /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */ | |
bd4c625c LT |
1055 | if (reiserfs_posixacl(s)) |
1056 | s->s_flags |= MS_POSIXACL; | |
ab17c4f0 | 1057 | else |
ab17c4f0 | 1058 | s->s_flags &= ~MS_POSIXACL; |
bd4c625c LT |
1059 | |
1060 | return err; | |
1da177e4 | 1061 | } |