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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" |
1da177e4 | 48 | #include <asm/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> |
1da177e4 | 53 | |
1da177e4 LT |
54 | #define PRIVROOT_NAME ".reiserfs_priv" |
55 | #define XAROOT_NAME "xattrs" | |
56 | ||
1da177e4 | 57 | |
6c17675e JM |
58 | /* Helpers for inode ops. We do this so that we don't have all the VFS |
59 | * overhead and also for proper i_mutex annotation. | |
60 | * dir->i_mutex must be held for all of them. */ | |
3a355cc6 | 61 | #ifdef CONFIG_REISERFS_FS_XATTR |
6c17675e | 62 | static int xattr_create(struct inode *dir, struct dentry *dentry, int mode) |
1da177e4 | 63 | { |
6c17675e | 64 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
ebfc3b49 | 65 | return dir->i_op->create(dir, dentry, mode, true); |
6c17675e | 66 | } |
3a355cc6 | 67 | #endif |
bd4c625c | 68 | |
18bb1db3 | 69 | static int xattr_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
6c17675e JM |
70 | { |
71 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); | |
6c17675e JM |
72 | return dir->i_op->mkdir(dir, dentry, mode); |
73 | } | |
bd4c625c | 74 | |
6c17675e JM |
75 | /* We use I_MUTEX_CHILD here to silence lockdep. It's safe because xattr |
76 | * mutation ops aren't called during rename or splace, which are the | |
77 | * only other users of I_MUTEX_CHILD. It violates the ordering, but that's | |
78 | * better than allocating another subclass just for this code. */ | |
79 | static int xattr_unlink(struct inode *dir, struct dentry *dentry) | |
80 | { | |
81 | int error; | |
82 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); | |
bd4c625c | 83 | |
4dd85969 FW |
84 | reiserfs_mutex_lock_nested_safe(&dentry->d_inode->i_mutex, |
85 | I_MUTEX_CHILD, dir->i_sb); | |
6c17675e JM |
86 | error = dir->i_op->unlink(dir, dentry); |
87 | mutex_unlock(&dentry->d_inode->i_mutex); | |
88 | ||
89 | if (!error) | |
90 | d_delete(dentry); | |
91 | return error; | |
92 | } | |
93 | ||
94 | static int xattr_rmdir(struct inode *dir, struct dentry *dentry) | |
95 | { | |
96 | int error; | |
97 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); | |
6c17675e | 98 | |
835d5247 FW |
99 | reiserfs_mutex_lock_nested_safe(&dentry->d_inode->i_mutex, |
100 | I_MUTEX_CHILD, dir->i_sb); | |
6c17675e JM |
101 | error = dir->i_op->rmdir(dir, dentry); |
102 | if (!error) | |
103 | dentry->d_inode->i_flags |= S_DEAD; | |
104 | mutex_unlock(&dentry->d_inode->i_mutex); | |
105 | if (!error) | |
106 | d_delete(dentry); | |
6c17675e JM |
107 | |
108 | return error; | |
109 | } | |
110 | ||
6c17675e JM |
111 | #define xattr_may_create(flags) (!flags || flags & XATTR_CREATE) |
112 | ||
ab17c4f0 | 113 | static struct dentry *open_xa_root(struct super_block *sb, int flags) |
6c17675e | 114 | { |
ab17c4f0 JM |
115 | struct dentry *privroot = REISERFS_SB(sb)->priv_root; |
116 | struct dentry *xaroot; | |
117 | if (!privroot->d_inode) | |
118 | return ERR_PTR(-ENODATA); | |
6c17675e | 119 | |
ab17c4f0 | 120 | mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR); |
6c17675e | 121 | |
ab17c4f0 | 122 | xaroot = dget(REISERFS_SB(sb)->xattr_root); |
ceb5edc4 JM |
123 | if (!xaroot) |
124 | xaroot = ERR_PTR(-ENODATA); | |
125 | else if (!xaroot->d_inode) { | |
ab17c4f0 | 126 | int err = -ENODATA; |
5a6059c3 | 127 | if (xattr_may_create(flags)) |
ab17c4f0 | 128 | err = xattr_mkdir(privroot->d_inode, xaroot, 0700); |
9b7f3755 | 129 | if (err) { |
ab17c4f0 JM |
130 | dput(xaroot); |
131 | xaroot = ERR_PTR(err); | |
9b7f3755 | 132 | } |
bd4c625c | 133 | } |
6c17675e | 134 | |
ab17c4f0 JM |
135 | mutex_unlock(&privroot->d_inode->i_mutex); |
136 | return xaroot; | |
1da177e4 LT |
137 | } |
138 | ||
bd4c625c | 139 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
1da177e4 | 140 | { |
bd4c625c LT |
141 | struct dentry *xaroot, *xadir; |
142 | char namebuf[17]; | |
143 | ||
6c17675e | 144 | xaroot = open_xa_root(inode->i_sb, flags); |
9b7f3755 | 145 | if (IS_ERR(xaroot)) |
bd4c625c | 146 | return xaroot; |
bd4c625c | 147 | |
bd4c625c LT |
148 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
149 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), | |
150 | inode->i_generation); | |
bd4c625c | 151 | |
ab17c4f0 JM |
152 | mutex_lock_nested(&xaroot->d_inode->i_mutex, I_MUTEX_XATTR); |
153 | ||
154 | xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf)); | |
155 | if (!IS_ERR(xadir) && !xadir->d_inode) { | |
156 | int err = -ENODATA; | |
157 | if (xattr_may_create(flags)) | |
158 | err = xattr_mkdir(xaroot->d_inode, xadir, 0700); | |
159 | if (err) { | |
160 | dput(xadir); | |
161 | xadir = ERR_PTR(err); | |
162 | } | |
163 | } | |
164 | ||
165 | mutex_unlock(&xaroot->d_inode->i_mutex); | |
bd4c625c LT |
166 | dput(xaroot); |
167 | return xadir; | |
1da177e4 LT |
168 | } |
169 | ||
48b32a35 JM |
170 | /* The following are side effects of other operations that aren't explicitly |
171 | * modifying extended attributes. This includes operations such as permissions | |
172 | * or ownership changes, object deletions, etc. */ | |
a41f1a47 JM |
173 | struct reiserfs_dentry_buf { |
174 | struct dentry *xadir; | |
175 | int count; | |
176 | struct dentry *dentries[8]; | |
177 | }; | |
bd4c625c | 178 | |
a72bdb1c | 179 | static int |
a41f1a47 JM |
180 | fill_with_dentries(void *buf, const char *name, int namelen, loff_t offset, |
181 | u64 ino, unsigned int d_type) | |
a72bdb1c | 182 | { |
a41f1a47 | 183 | struct reiserfs_dentry_buf *dbuf = buf; |
a72bdb1c | 184 | struct dentry *dentry; |
5a6059c3 | 185 | WARN_ON_ONCE(!mutex_is_locked(&dbuf->xadir->d_inode->i_mutex)); |
bd4c625c | 186 | |
a41f1a47 JM |
187 | if (dbuf->count == ARRAY_SIZE(dbuf->dentries)) |
188 | return -ENOSPC; | |
bd4c625c | 189 | |
35e5cbc0 JK |
190 | if (name[0] == '.' && (namelen < 2 || |
191 | (namelen == 2 && name[1] == '.'))) | |
a41f1a47 | 192 | return 0; |
bd4c625c | 193 | |
a41f1a47 | 194 | dentry = lookup_one_len(name, dbuf->xadir, namelen); |
a72bdb1c | 195 | if (IS_ERR(dentry)) { |
a41f1a47 | 196 | return PTR_ERR(dentry); |
a72bdb1c | 197 | } else if (!dentry->d_inode) { |
a41f1a47 JM |
198 | /* A directory entry exists, but no file? */ |
199 | reiserfs_error(dentry->d_sb, "xattr-20003", | |
200 | "Corrupted directory: xattr %s listed but " | |
201 | "not found for file %s.\n", | |
202 | dentry->d_name.name, dbuf->xadir->d_name.name); | |
203 | dput(dentry); | |
204 | return -EIO; | |
bd4c625c | 205 | } |
1da177e4 | 206 | |
a41f1a47 JM |
207 | dbuf->dentries[dbuf->count++] = dentry; |
208 | return 0; | |
1da177e4 LT |
209 | } |
210 | ||
a41f1a47 JM |
211 | static void |
212 | cleanup_dentry_buf(struct reiserfs_dentry_buf *buf) | |
1da177e4 | 213 | { |
a41f1a47 JM |
214 | int i; |
215 | for (i = 0; i < buf->count; i++) | |
216 | if (buf->dentries[i]) | |
217 | dput(buf->dentries[i]); | |
a72bdb1c JM |
218 | } |
219 | ||
a41f1a47 JM |
220 | static int reiserfs_for_each_xattr(struct inode *inode, |
221 | int (*action)(struct dentry *, void *), | |
222 | void *data) | |
a72bdb1c | 223 | { |
a41f1a47 JM |
224 | struct dentry *dir; |
225 | int i, err = 0; | |
226 | loff_t pos = 0; | |
227 | struct reiserfs_dentry_buf buf = { | |
228 | .count = 0, | |
229 | }; | |
1da177e4 | 230 | |
a72bdb1c JM |
231 | /* Skip out, an xattr has no xattrs associated with it */ |
232 | if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1) | |
233 | return 0; | |
1da177e4 | 234 | |
27026a05 | 235 | reiserfs_write_unlock(inode->i_sb); |
6c17675e | 236 | dir = open_xa_dir(inode, XATTR_REPLACE); |
a72bdb1c JM |
237 | if (IS_ERR(dir)) { |
238 | err = PTR_ERR(dir); | |
27026a05 | 239 | reiserfs_write_lock(inode->i_sb); |
a72bdb1c JM |
240 | goto out; |
241 | } else if (!dir->d_inode) { | |
a41f1a47 | 242 | err = 0; |
27026a05 | 243 | reiserfs_write_lock(inode->i_sb); |
a41f1a47 | 244 | goto out_dir; |
a72bdb1c | 245 | } |
1da177e4 | 246 | |
6c17675e | 247 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
27026a05 FW |
248 | |
249 | reiserfs_write_lock(inode->i_sb); | |
250 | ||
a41f1a47 JM |
251 | buf.xadir = dir; |
252 | err = reiserfs_readdir_dentry(dir, &buf, fill_with_dentries, &pos); | |
253 | while ((err == 0 || err == -ENOSPC) && buf.count) { | |
254 | err = 0; | |
1da177e4 | 255 | |
a41f1a47 JM |
256 | for (i = 0; i < buf.count && buf.dentries[i]; i++) { |
257 | int lerr = 0; | |
258 | struct dentry *dentry = buf.dentries[i]; | |
1da177e4 | 259 | |
a41f1a47 JM |
260 | if (err == 0 && !S_ISDIR(dentry->d_inode->i_mode)) |
261 | lerr = action(dentry, data); | |
1da177e4 | 262 | |
a41f1a47 JM |
263 | dput(dentry); |
264 | buf.dentries[i] = NULL; | |
265 | err = lerr ?: err; | |
bd4c625c | 266 | } |
a41f1a47 JM |
267 | buf.count = 0; |
268 | if (!err) | |
269 | err = reiserfs_readdir_dentry(dir, &buf, | |
270 | fill_with_dentries, &pos); | |
8b6dd72a | 271 | } |
a41f1a47 | 272 | mutex_unlock(&dir->d_inode->i_mutex); |
1da177e4 | 273 | |
a41f1a47 JM |
274 | /* Clean up after a failed readdir */ |
275 | cleanup_dentry_buf(&buf); | |
1da177e4 | 276 | |
d984561b | 277 | if (!err) { |
a41f1a47 JM |
278 | /* We start a transaction here to avoid a ABBA situation |
279 | * between the xattr root's i_mutex and the journal lock. | |
280 | * This doesn't incur much additional overhead since the | |
281 | * new transaction will just nest inside the | |
282 | * outer transaction. */ | |
283 | int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + | |
284 | 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); | |
285 | struct reiserfs_transaction_handle th; | |
286 | err = journal_begin(&th, inode->i_sb, blocks); | |
287 | if (!err) { | |
288 | int jerror; | |
8b513f56 FW |
289 | reiserfs_mutex_lock_nested_safe( |
290 | &dir->d_parent->d_inode->i_mutex, | |
291 | I_MUTEX_XATTR, inode->i_sb); | |
a41f1a47 JM |
292 | err = action(dir, data); |
293 | jerror = journal_end(&th, inode->i_sb, blocks); | |
294 | mutex_unlock(&dir->d_parent->d_inode->i_mutex); | |
295 | err = jerror ?: err; | |
296 | } | |
a72bdb1c | 297 | } |
a41f1a47 JM |
298 | out_dir: |
299 | dput(dir); | |
a72bdb1c | 300 | out: |
a41f1a47 JM |
301 | /* -ENODATA isn't an error */ |
302 | if (err == -ENODATA) | |
303 | err = 0; | |
a72bdb1c JM |
304 | return err; |
305 | } | |
1da177e4 | 306 | |
a41f1a47 | 307 | static int delete_one_xattr(struct dentry *dentry, void *data) |
a72bdb1c | 308 | { |
a41f1a47 | 309 | struct inode *dir = dentry->d_parent->d_inode; |
1da177e4 | 310 | |
a41f1a47 JM |
311 | /* This is the xattr dir, handle specially. */ |
312 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
313 | return xattr_rmdir(dir, dentry); | |
1da177e4 | 314 | |
a41f1a47 JM |
315 | return xattr_unlink(dir, dentry); |
316 | } | |
bd4c625c | 317 | |
a41f1a47 JM |
318 | static int chown_one_xattr(struct dentry *dentry, void *data) |
319 | { | |
320 | struct iattr *attrs = data; | |
4a857011 JM |
321 | int ia_valid = attrs->ia_valid; |
322 | int err; | |
323 | ||
324 | /* | |
325 | * We only want the ownership bits. Otherwise, we'll do | |
326 | * things like change a directory to a regular file if | |
327 | * ATTR_MODE is set. | |
328 | */ | |
329 | attrs->ia_valid &= (ATTR_UID|ATTR_GID); | |
330 | err = reiserfs_setattr(dentry, attrs); | |
331 | attrs->ia_valid = ia_valid; | |
332 | ||
333 | return err; | |
a41f1a47 | 334 | } |
1da177e4 | 335 | |
a41f1a47 JM |
336 | /* No i_mutex, but the inode is unconnected. */ |
337 | int reiserfs_delete_xattrs(struct inode *inode) | |
338 | { | |
339 | int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); | |
340 | if (err) | |
341 | reiserfs_warning(inode->i_sb, "jdm-20004", | |
342 | "Couldn't delete all xattrs (%d)\n", err); | |
a72bdb1c JM |
343 | return err; |
344 | } | |
1da177e4 | 345 | |
a41f1a47 | 346 | /* inode->i_mutex: down */ |
a72bdb1c JM |
347 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
348 | { | |
a41f1a47 | 349 | int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); |
8b6dd72a JM |
350 | if (err) |
351 | reiserfs_warning(inode->i_sb, "jdm-20007", | |
352 | "Couldn't chown all xattrs (%d)\n", err); | |
a72bdb1c | 353 | return err; |
1da177e4 LT |
354 | } |
355 | ||
a72bdb1c | 356 | #ifdef CONFIG_REISERFS_FS_XATTR |
a72bdb1c JM |
357 | /* Returns a dentry corresponding to a specific extended attribute file |
358 | * for the inode. If flags allow, the file is created. Otherwise, a | |
359 | * valid or negative dentry, or an error is returned. */ | |
48b32a35 JM |
360 | static struct dentry *xattr_lookup(struct inode *inode, const char *name, |
361 | int flags) | |
1da177e4 | 362 | { |
a72bdb1c JM |
363 | struct dentry *xadir, *xafile; |
364 | int err = 0; | |
365 | ||
366 | xadir = open_xa_dir(inode, flags); | |
6c17675e | 367 | if (IS_ERR(xadir)) |
a72bdb1c | 368 | return ERR_CAST(xadir); |
a72bdb1c | 369 | |
5a6059c3 | 370 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
a72bdb1c JM |
371 | xafile = lookup_one_len(name, xadir, strlen(name)); |
372 | if (IS_ERR(xafile)) { | |
6c17675e JM |
373 | err = PTR_ERR(xafile); |
374 | goto out; | |
bd4c625c | 375 | } |
a72bdb1c | 376 | |
6c17675e JM |
377 | if (xafile->d_inode && (flags & XATTR_CREATE)) |
378 | err = -EEXIST; | |
a72bdb1c | 379 | |
6c17675e JM |
380 | if (!xafile->d_inode) { |
381 | err = -ENODATA; | |
5a6059c3 | 382 | if (xattr_may_create(flags)) |
6c17675e JM |
383 | err = xattr_create(xadir->d_inode, xafile, |
384 | 0700|S_IFREG); | |
a72bdb1c JM |
385 | } |
386 | ||
6c17675e JM |
387 | if (err) |
388 | dput(xafile); | |
a72bdb1c | 389 | out: |
5a6059c3 | 390 | mutex_unlock(&xadir->d_inode->i_mutex); |
a72bdb1c JM |
391 | dput(xadir); |
392 | if (err) | |
6c17675e | 393 | return ERR_PTR(err); |
a72bdb1c | 394 | return xafile; |
1da177e4 LT |
395 | } |
396 | ||
1da177e4 | 397 | /* Internal operations on file data */ |
bd4c625c | 398 | static inline void reiserfs_put_page(struct page *page) |
1da177e4 | 399 | { |
bd4c625c LT |
400 | kunmap(page); |
401 | page_cache_release(page); | |
1da177e4 LT |
402 | } |
403 | ||
ec6ea56b | 404 | static struct page *reiserfs_get_page(struct inode *dir, size_t n) |
1da177e4 | 405 | { |
bd4c625c LT |
406 | struct address_space *mapping = dir->i_mapping; |
407 | struct page *page; | |
408 | /* We can deadlock if we try to free dentries, | |
25985edc | 409 | and an unlink/rmdir has just occurred - GFP_NOFS avoids this */ |
c4cdd038 | 410 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
ec6ea56b | 411 | page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL); |
bd4c625c | 412 | if (!IS_ERR(page)) { |
bd4c625c | 413 | kmap(page); |
bd4c625c LT |
414 | if (PageError(page)) |
415 | goto fail; | |
416 | } | |
417 | return page; | |
418 | ||
419 | fail: | |
420 | reiserfs_put_page(page); | |
421 | return ERR_PTR(-EIO); | |
1da177e4 LT |
422 | } |
423 | ||
bd4c625c | 424 | static inline __u32 xattr_hash(const char *msg, int len) |
1da177e4 | 425 | { |
bd4c625c | 426 | return csum_partial(msg, len, 0); |
1da177e4 LT |
427 | } |
428 | ||
ba9d8cec VS |
429 | int reiserfs_commit_write(struct file *f, struct page *page, |
430 | unsigned from, unsigned to); | |
ba9d8cec | 431 | |
48b32a35 JM |
432 | static void update_ctime(struct inode *inode) |
433 | { | |
434 | struct timespec now = current_fs_time(inode->i_sb); | |
1d3382cb | 435 | if (inode_unhashed(inode) || !inode->i_nlink || |
48b32a35 JM |
436 | timespec_equal(&inode->i_ctime, &now)) |
437 | return; | |
438 | ||
439 | inode->i_ctime = CURRENT_TIME_SEC; | |
440 | mark_inode_dirty(inode); | |
441 | } | |
442 | ||
443 | static int lookup_and_delete_xattr(struct inode *inode, const char *name) | |
444 | { | |
445 | int err = 0; | |
446 | struct dentry *dentry, *xadir; | |
447 | ||
448 | xadir = open_xa_dir(inode, XATTR_REPLACE); | |
449 | if (IS_ERR(xadir)) | |
450 | return PTR_ERR(xadir); | |
451 | ||
5a6059c3 | 452 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
48b32a35 JM |
453 | dentry = lookup_one_len(name, xadir, strlen(name)); |
454 | if (IS_ERR(dentry)) { | |
455 | err = PTR_ERR(dentry); | |
456 | goto out_dput; | |
457 | } | |
458 | ||
459 | if (dentry->d_inode) { | |
4f3be1b5 | 460 | reiserfs_write_lock(inode->i_sb); |
48b32a35 | 461 | err = xattr_unlink(xadir->d_inode, dentry); |
4f3be1b5 | 462 | reiserfs_write_unlock(inode->i_sb); |
48b32a35 JM |
463 | update_ctime(inode); |
464 | } | |
465 | ||
466 | dput(dentry); | |
467 | out_dput: | |
5a6059c3 | 468 | mutex_unlock(&xadir->d_inode->i_mutex); |
48b32a35 JM |
469 | dput(xadir); |
470 | return err; | |
471 | } | |
472 | ||
ba9d8cec | 473 | |
1da177e4 LT |
474 | /* Generic extended attribute operations that can be used by xa plugins */ |
475 | ||
476 | /* | |
1b1dcc1b | 477 | * inode->i_mutex: down |
1da177e4 LT |
478 | */ |
479 | int | |
0ab2621e JM |
480 | reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, |
481 | struct inode *inode, const char *name, | |
482 | const void *buffer, size_t buffer_size, int flags) | |
1da177e4 | 483 | { |
bd4c625c | 484 | int err = 0; |
3227e14c | 485 | struct dentry *dentry; |
bd4c625c LT |
486 | struct page *page; |
487 | char *data; | |
bd4c625c LT |
488 | size_t file_pos = 0; |
489 | size_t buffer_pos = 0; | |
48b32a35 | 490 | size_t new_size; |
bd4c625c LT |
491 | __u32 xahash = 0; |
492 | ||
bd4c625c LT |
493 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
494 | return -EOPNOTSUPP; | |
495 | ||
3f14fea6 | 496 | reiserfs_write_unlock(inode->i_sb); |
4f3be1b5 FW |
497 | |
498 | if (!buffer) { | |
499 | err = lookup_and_delete_xattr(inode, name); | |
500 | reiserfs_write_lock(inode->i_sb); | |
501 | return err; | |
502 | } | |
503 | ||
48b32a35 | 504 | dentry = xattr_lookup(inode, name, flags); |
3f14fea6 FW |
505 | if (IS_ERR(dentry)) { |
506 | reiserfs_write_lock(inode->i_sb); | |
48b32a35 | 507 | return PTR_ERR(dentry); |
3f14fea6 FW |
508 | } |
509 | ||
f3e22f48 | 510 | down_write(&REISERFS_I(inode)->i_xattr_sem); |
bd4c625c | 511 | |
3f14fea6 | 512 | reiserfs_write_lock(inode->i_sb); |
bd4c625c | 513 | |
8b6dd72a | 514 | xahash = xattr_hash(buffer, buffer_size); |
bd4c625c LT |
515 | while (buffer_pos < buffer_size || buffer_pos == 0) { |
516 | size_t chunk; | |
517 | size_t skip = 0; | |
518 | size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1)); | |
519 | if (buffer_size - buffer_pos > PAGE_CACHE_SIZE) | |
520 | chunk = PAGE_CACHE_SIZE; | |
521 | else | |
522 | chunk = buffer_size - buffer_pos; | |
523 | ||
ec6ea56b | 524 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
525 | if (IS_ERR(page)) { |
526 | err = PTR_ERR(page); | |
48b32a35 | 527 | goto out_unlock; |
bd4c625c LT |
528 | } |
529 | ||
530 | lock_page(page); | |
531 | data = page_address(page); | |
532 | ||
533 | if (file_pos == 0) { | |
534 | struct reiserfs_xattr_header *rxh; | |
535 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
536 | if (chunk + skip > PAGE_CACHE_SIZE) | |
537 | chunk = PAGE_CACHE_SIZE - skip; | |
538 | rxh = (struct reiserfs_xattr_header *)data; | |
539 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); | |
540 | rxh->h_hash = cpu_to_le32(xahash); | |
541 | } | |
542 | ||
ebdec241 | 543 | err = __reiserfs_write_begin(page, page_offset, chunk + skip); |
bd4c625c LT |
544 | if (!err) { |
545 | if (buffer) | |
546 | memcpy(data + skip, buffer + buffer_pos, chunk); | |
3227e14c JM |
547 | err = reiserfs_commit_write(NULL, page, page_offset, |
548 | page_offset + chunk + | |
549 | skip); | |
bd4c625c LT |
550 | } |
551 | unlock_page(page); | |
552 | reiserfs_put_page(page); | |
553 | buffer_pos += chunk; | |
554 | file_pos += chunk; | |
555 | skip = 0; | |
556 | if (err || buffer_size == 0 || !buffer) | |
557 | break; | |
558 | } | |
559 | ||
48b32a35 JM |
560 | new_size = buffer_size + sizeof(struct reiserfs_xattr_header); |
561 | if (!err && new_size < i_size_read(dentry->d_inode)) { | |
562 | struct iattr newattrs = { | |
563 | .ia_ctime = current_fs_time(inode->i_sb), | |
fb2162df | 564 | .ia_size = new_size, |
48b32a35 JM |
565 | .ia_valid = ATTR_SIZE | ATTR_CTIME, |
566 | }; | |
31370f62 FW |
567 | |
568 | reiserfs_write_unlock(inode->i_sb); | |
48b32a35 | 569 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR); |
bd5fe6c5 | 570 | inode_dio_wait(dentry->d_inode); |
31370f62 FW |
571 | reiserfs_write_lock(inode->i_sb); |
572 | ||
48b32a35 | 573 | err = reiserfs_setattr(dentry, &newattrs); |
48b32a35 JM |
574 | mutex_unlock(&dentry->d_inode->i_mutex); |
575 | } else | |
576 | update_ctime(inode); | |
577 | out_unlock: | |
8b6dd72a | 578 | up_write(&REISERFS_I(inode)->i_xattr_sem); |
3227e14c | 579 | dput(dentry); |
48b32a35 JM |
580 | return err; |
581 | } | |
bd4c625c | 582 | |
0ab2621e JM |
583 | /* We need to start a transaction to maintain lock ordering */ |
584 | int reiserfs_xattr_set(struct inode *inode, const char *name, | |
585 | const void *buffer, size_t buffer_size, int flags) | |
48b32a35 | 586 | { |
0ab2621e JM |
587 | |
588 | struct reiserfs_transaction_handle th; | |
589 | int error, error2; | |
590 | size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size); | |
591 | ||
592 | if (!(flags & XATTR_REPLACE)) | |
593 | jbegin_count += reiserfs_xattr_jcreate_nblocks(inode); | |
594 | ||
595 | reiserfs_write_lock(inode->i_sb); | |
596 | error = journal_begin(&th, inode->i_sb, jbegin_count); | |
597 | if (error) { | |
598 | reiserfs_write_unlock(inode->i_sb); | |
599 | return error; | |
1da177e4 | 600 | } |
bd4c625c | 601 | |
0ab2621e JM |
602 | error = reiserfs_xattr_set_handle(&th, inode, name, |
603 | buffer, buffer_size, flags); | |
bd4c625c | 604 | |
0ab2621e JM |
605 | error2 = journal_end(&th, inode->i_sb, jbegin_count); |
606 | if (error == 0) | |
607 | error = error2; | |
608 | reiserfs_write_unlock(inode->i_sb); | |
609 | ||
610 | return error; | |
1da177e4 LT |
611 | } |
612 | ||
613 | /* | |
1b1dcc1b | 614 | * inode->i_mutex: down |
1da177e4 LT |
615 | */ |
616 | int | |
48b32a35 | 617 | reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, |
bd4c625c | 618 | size_t buffer_size) |
1da177e4 | 619 | { |
bd4c625c | 620 | ssize_t err = 0; |
3227e14c | 621 | struct dentry *dentry; |
bd4c625c LT |
622 | size_t isize; |
623 | size_t file_pos = 0; | |
624 | size_t buffer_pos = 0; | |
625 | struct page *page; | |
bd4c625c LT |
626 | __u32 hash = 0; |
627 | ||
628 | if (name == NULL) | |
629 | return -EINVAL; | |
630 | ||
631 | /* We can't have xattrs attached to v1 items since they don't have | |
632 | * generation numbers */ | |
633 | if (get_inode_sd_version(inode) == STAT_DATA_V1) | |
634 | return -EOPNOTSUPP; | |
635 | ||
48b32a35 | 636 | dentry = xattr_lookup(inode, name, XATTR_REPLACE); |
3227e14c JM |
637 | if (IS_ERR(dentry)) { |
638 | err = PTR_ERR(dentry); | |
bd4c625c LT |
639 | goto out; |
640 | } | |
641 | ||
8b6dd72a | 642 | down_read(&REISERFS_I(inode)->i_xattr_sem); |
d984561b | 643 | |
f437c529 | 644 | isize = i_size_read(dentry->d_inode); |
bd4c625c LT |
645 | |
646 | /* Just return the size needed */ | |
647 | if (buffer == NULL) { | |
648 | err = isize - sizeof(struct reiserfs_xattr_header); | |
8b6dd72a | 649 | goto out_unlock; |
bd4c625c LT |
650 | } |
651 | ||
652 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { | |
653 | err = -ERANGE; | |
8b6dd72a | 654 | goto out_unlock; |
bd4c625c LT |
655 | } |
656 | ||
657 | while (file_pos < isize) { | |
658 | size_t chunk; | |
659 | char *data; | |
660 | size_t skip = 0; | |
661 | if (isize - file_pos > PAGE_CACHE_SIZE) | |
662 | chunk = PAGE_CACHE_SIZE; | |
663 | else | |
664 | chunk = isize - file_pos; | |
665 | ||
a72bdb1c | 666 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
667 | if (IS_ERR(page)) { |
668 | err = PTR_ERR(page); | |
8b6dd72a | 669 | goto out_unlock; |
bd4c625c LT |
670 | } |
671 | ||
672 | lock_page(page); | |
673 | data = page_address(page); | |
674 | if (file_pos == 0) { | |
675 | struct reiserfs_xattr_header *rxh = | |
676 | (struct reiserfs_xattr_header *)data; | |
677 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
678 | chunk -= skip; | |
679 | /* Magic doesn't match up.. */ | |
680 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { | |
681 | unlock_page(page); | |
682 | reiserfs_put_page(page); | |
a72bdb1c | 683 | reiserfs_warning(inode->i_sb, "jdm-20001", |
bd4c625c LT |
684 | "Invalid magic for xattr (%s) " |
685 | "associated with %k", name, | |
686 | INODE_PKEY(inode)); | |
687 | err = -EIO; | |
8b6dd72a | 688 | goto out_unlock; |
bd4c625c LT |
689 | } |
690 | hash = le32_to_cpu(rxh->h_hash); | |
691 | } | |
692 | memcpy(buffer + buffer_pos, data + skip, chunk); | |
693 | unlock_page(page); | |
694 | reiserfs_put_page(page); | |
695 | file_pos += chunk; | |
696 | buffer_pos += chunk; | |
697 | skip = 0; | |
698 | } | |
699 | err = isize - sizeof(struct reiserfs_xattr_header); | |
700 | ||
701 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != | |
702 | hash) { | |
a72bdb1c | 703 | reiserfs_warning(inode->i_sb, "jdm-20002", |
bd4c625c LT |
704 | "Invalid hash for xattr (%s) associated " |
705 | "with %k", name, INODE_PKEY(inode)); | |
706 | err = -EIO; | |
707 | } | |
708 | ||
8b6dd72a JM |
709 | out_unlock: |
710 | up_read(&REISERFS_I(inode)->i_xattr_sem); | |
3227e14c | 711 | dput(dentry); |
bd4c625c | 712 | |
a72bdb1c | 713 | out: |
bd4c625c | 714 | return err; |
1da177e4 LT |
715 | } |
716 | ||
48b32a35 JM |
717 | /* |
718 | * In order to implement different sets of xattr operations for each xattr | |
719 | * prefix with the generic xattr API, a filesystem should create a | |
720 | * null-terminated array of struct xattr_handler (one for each prefix) and | |
721 | * hang a pointer to it off of the s_xattr field of the superblock. | |
722 | * | |
723 | * The generic_fooxattr() functions will use this list to dispatch xattr | |
724 | * operations to the correct xattr_handler. | |
725 | */ | |
726 | #define for_each_xattr_handler(handlers, handler) \ | |
727 | for ((handler) = *(handlers)++; \ | |
728 | (handler) != NULL; \ | |
729 | (handler) = *(handlers)++) | |
1da177e4 | 730 | |
48b32a35 | 731 | /* This is the implementation for the xattr plugin infrastructure */ |
94d09a98 SH |
732 | static inline const struct xattr_handler * |
733 | find_xattr_handler_prefix(const struct xattr_handler **handlers, | |
48b32a35 | 734 | const char *name) |
1da177e4 | 735 | { |
94d09a98 | 736 | const struct xattr_handler *xah; |
bd4c625c | 737 | |
48b32a35 JM |
738 | if (!handlers) |
739 | return NULL; | |
bd4c625c | 740 | |
48b32a35 JM |
741 | for_each_xattr_handler(handlers, xah) { |
742 | if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0) | |
743 | break; | |
bd4c625c LT |
744 | } |
745 | ||
48b32a35 | 746 | return xah; |
bd4c625c | 747 | } |
1da177e4 | 748 | |
1da177e4 LT |
749 | |
750 | /* | |
751 | * Inode operation getxattr() | |
1da177e4 LT |
752 | */ |
753 | ssize_t | |
bd4c625c LT |
754 | reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, |
755 | size_t size) | |
1da177e4 | 756 | { |
94d09a98 | 757 | const struct xattr_handler *handler; |
bd4c625c | 758 | |
431547b3 | 759 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 760 | |
431547b3 | 761 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c LT |
762 | return -EOPNOTSUPP; |
763 | ||
431547b3 | 764 | return handler->get(dentry, name, buffer, size, handler->flags); |
1da177e4 LT |
765 | } |
766 | ||
1da177e4 LT |
767 | /* |
768 | * Inode operation setxattr() | |
769 | * | |
1b1dcc1b | 770 | * dentry->d_inode->i_mutex down |
1da177e4 LT |
771 | */ |
772 | int | |
bd4c625c LT |
773 | reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
774 | size_t size, int flags) | |
1da177e4 | 775 | { |
94d09a98 | 776 | const struct xattr_handler *handler; |
bd4c625c | 777 | |
431547b3 | 778 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 779 | |
431547b3 | 780 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c LT |
781 | return -EOPNOTSUPP; |
782 | ||
431547b3 | 783 | return handler->set(dentry, name, value, size, flags, handler->flags); |
1da177e4 LT |
784 | } |
785 | ||
786 | /* | |
787 | * Inode operation removexattr() | |
788 | * | |
1b1dcc1b | 789 | * dentry->d_inode->i_mutex down |
1da177e4 | 790 | */ |
bd4c625c | 791 | int reiserfs_removexattr(struct dentry *dentry, const char *name) |
1da177e4 | 792 | { |
94d09a98 | 793 | const struct xattr_handler *handler; |
431547b3 | 794 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
1da177e4 | 795 | |
431547b3 | 796 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c | 797 | return -EOPNOTSUPP; |
1da177e4 | 798 | |
431547b3 | 799 | return handler->set(dentry, name, NULL, 0, XATTR_REPLACE, handler->flags); |
1da177e4 LT |
800 | } |
801 | ||
48b32a35 JM |
802 | struct listxattr_buf { |
803 | size_t size; | |
804 | size_t pos; | |
805 | char *buf; | |
431547b3 | 806 | struct dentry *dentry; |
1da177e4 LT |
807 | }; |
808 | ||
48b32a35 JM |
809 | static int listxattr_filler(void *buf, const char *name, int namelen, |
810 | loff_t offset, u64 ino, unsigned int d_type) | |
1da177e4 | 811 | { |
48b32a35 JM |
812 | struct listxattr_buf *b = (struct listxattr_buf *)buf; |
813 | size_t size; | |
814 | if (name[0] != '.' || | |
815 | (namelen != 1 && (name[1] != '.' || namelen != 2))) { | |
94d09a98 | 816 | const struct xattr_handler *handler; |
431547b3 | 817 | handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr, |
48b32a35 JM |
818 | name); |
819 | if (!handler) /* Unsupported xattr name */ | |
820 | return 0; | |
821 | if (b->buf) { | |
431547b3 CH |
822 | size = handler->list(b->dentry, b->buf + b->pos, |
823 | b->size, name, namelen, | |
824 | handler->flags); | |
48b32a35 JM |
825 | if (size > b->size) |
826 | return -ERANGE; | |
827 | } else { | |
431547b3 CH |
828 | size = handler->list(b->dentry, NULL, 0, name, |
829 | namelen, handler->flags); | |
bd4c625c | 830 | } |
bd4c625c | 831 | |
48b32a35 JM |
832 | b->pos += size; |
833 | } | |
bd4c625c | 834 | return 0; |
1da177e4 | 835 | } |
bd4c625c | 836 | |
1da177e4 LT |
837 | /* |
838 | * Inode operation listxattr() | |
839 | * | |
48b32a35 JM |
840 | * We totally ignore the generic listxattr here because it would be stupid |
841 | * not to. Since the xattrs are organized in a directory, we can just | |
842 | * readdir to find them. | |
1da177e4 | 843 | */ |
bd4c625c | 844 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
1da177e4 | 845 | { |
bd4c625c LT |
846 | struct dentry *dir; |
847 | int err = 0; | |
a41f1a47 | 848 | loff_t pos = 0; |
48b32a35 | 849 | struct listxattr_buf buf = { |
431547b3 | 850 | .dentry = dentry, |
48b32a35 JM |
851 | .buf = buffer, |
852 | .size = buffer ? size : 0, | |
853 | }; | |
bd4c625c LT |
854 | |
855 | if (!dentry->d_inode) | |
856 | return -EINVAL; | |
857 | ||
677c9b2e | 858 | if (!dentry->d_sb->s_xattr || |
bd4c625c LT |
859 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
860 | return -EOPNOTSUPP; | |
861 | ||
6c17675e | 862 | dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE); |
bd4c625c LT |
863 | if (IS_ERR(dir)) { |
864 | err = PTR_ERR(dir); | |
865 | if (err == -ENODATA) | |
48b32a35 | 866 | err = 0; /* Not an error if there aren't any xattrs */ |
bd4c625c LT |
867 | goto out; |
868 | } | |
869 | ||
6c17675e | 870 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
a41f1a47 | 871 | err = reiserfs_readdir_dentry(dir, &buf, listxattr_filler, &pos); |
6c17675e | 872 | mutex_unlock(&dir->d_inode->i_mutex); |
bd4c625c | 873 | |
48b32a35 JM |
874 | if (!err) |
875 | err = buf.pos; | |
bd4c625c | 876 | |
3227e14c | 877 | dput(dir); |
8b6dd72a | 878 | out: |
bd4c625c | 879 | return err; |
1da177e4 LT |
880 | } |
881 | ||
a72bdb1c | 882 | static int create_privroot(struct dentry *dentry) |
1da177e4 | 883 | { |
a72bdb1c JM |
884 | int err; |
885 | struct inode *inode = dentry->d_parent->d_inode; | |
5a6059c3 JM |
886 | WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex)); |
887 | ||
6c17675e | 888 | err = xattr_mkdir(inode, dentry, 0700); |
edcc37a0 AV |
889 | if (err || !dentry->d_inode) { |
890 | reiserfs_warning(dentry->d_sb, "jdm-20006", | |
891 | "xattrs/ACLs enabled and couldn't " | |
892 | "find/create .reiserfs_priv. " | |
893 | "Failing mount."); | |
894 | return -EOPNOTSUPP; | |
bd4c625c LT |
895 | } |
896 | ||
edcc37a0 AV |
897 | dentry->d_inode->i_flags |= S_PRIVATE; |
898 | reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr " | |
899 | "storage.\n", PRIVROOT_NAME); | |
bd4c625c | 900 | |
edcc37a0 | 901 | return 0; |
1da177e4 LT |
902 | } |
903 | ||
12abb35a JM |
904 | #else |
905 | int __init reiserfs_xattr_register_handlers(void) { return 0; } | |
906 | void reiserfs_xattr_unregister_handlers(void) {} | |
907 | static int create_privroot(struct dentry *dentry) { return 0; } | |
908 | #endif | |
909 | ||
910 | /* Actual operations that are exported to VFS-land */ | |
da02eb72 | 911 | static const struct xattr_handler *reiserfs_xattr_handlers[] = { |
12abb35a JM |
912 | #ifdef CONFIG_REISERFS_FS_XATTR |
913 | &reiserfs_xattr_user_handler, | |
914 | &reiserfs_xattr_trusted_handler, | |
915 | #endif | |
916 | #ifdef CONFIG_REISERFS_FS_SECURITY | |
917 | &reiserfs_xattr_security_handler, | |
918 | #endif | |
919 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL | |
920 | &reiserfs_posix_acl_access_handler, | |
921 | &reiserfs_posix_acl_default_handler, | |
922 | #endif | |
923 | NULL | |
924 | }; | |
925 | ||
a72bdb1c | 926 | static int xattr_mount_check(struct super_block *s) |
1da177e4 | 927 | { |
a72bdb1c JM |
928 | /* We need generation numbers to ensure that the oid mapping is correct |
929 | * v3.5 filesystems don't have them. */ | |
48b32a35 JM |
930 | if (old_format_only(s)) { |
931 | if (reiserfs_xattrs_optional(s)) { | |
932 | /* Old format filesystem, but optional xattrs have | |
933 | * been enabled. Error out. */ | |
934 | reiserfs_warning(s, "jdm-2005", | |
935 | "xattrs/ACLs not supported " | |
936 | "on pre-v3.6 format filesystems. " | |
937 | "Failing mount."); | |
938 | return -EOPNOTSUPP; | |
939 | } | |
a72bdb1c JM |
940 | } |
941 | ||
942 | return 0; | |
1da177e4 LT |
943 | } |
944 | ||
10556cb2 | 945 | int reiserfs_permission(struct inode *inode, int mask) |
b83674c0 JM |
946 | { |
947 | /* | |
948 | * We don't do permission checks on the internal objects. | |
949 | * Permissions are determined by the "owning" object. | |
950 | */ | |
951 | if (IS_PRIVATE(inode)) | |
952 | return 0; | |
953 | ||
2830ba7f | 954 | return generic_permission(inode, mask); |
b83674c0 JM |
955 | } |
956 | ||
0b728e19 | 957 | static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 958 | { |
cac36f70 | 959 | return -EPERM; |
1da177e4 LT |
960 | } |
961 | ||
e16404ed | 962 | static const struct dentry_operations xattr_lookup_poison_ops = { |
cac36f70 | 963 | .d_revalidate = xattr_hide_revalidate, |
1da177e4 LT |
964 | }; |
965 | ||
edcc37a0 AV |
966 | int reiserfs_lookup_privroot(struct super_block *s) |
967 | { | |
968 | struct dentry *dentry; | |
969 | int err = 0; | |
970 | ||
971 | /* If we don't have the privroot located yet - go find it */ | |
c72e0575 | 972 | reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s); |
edcc37a0 AV |
973 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, |
974 | strlen(PRIVROOT_NAME)); | |
975 | if (!IS_ERR(dentry)) { | |
976 | REISERFS_SB(s)->priv_root = dentry; | |
fb045adb | 977 | d_set_d_op(dentry, &xattr_lookup_poison_ops); |
edcc37a0 AV |
978 | if (dentry->d_inode) |
979 | dentry->d_inode->i_flags |= S_PRIVATE; | |
980 | } else | |
981 | err = PTR_ERR(dentry); | |
982 | mutex_unlock(&s->s_root->d_inode->i_mutex); | |
983 | ||
984 | return err; | |
985 | } | |
986 | ||
1da177e4 LT |
987 | /* We need to take a copy of the mount flags since things like |
988 | * MS_RDONLY don't get set until *after* we're called. | |
989 | * mount_flags != mount_options */ | |
bd4c625c | 990 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
1da177e4 | 991 | { |
bd4c625c | 992 | int err = 0; |
ab17c4f0 | 993 | struct dentry *privroot = REISERFS_SB(s)->priv_root; |
bd4c625c | 994 | |
a72bdb1c JM |
995 | err = xattr_mount_check(s); |
996 | if (err) | |
bd4c625c | 997 | goto error; |
bd4c625c | 998 | |
ab17c4f0 | 999 | if (!privroot->d_inode && !(mount_flags & MS_RDONLY)) { |
ae635c0b | 1000 | reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s); |
edcc37a0 | 1001 | err = create_privroot(REISERFS_SB(s)->priv_root); |
5a6059c3 | 1002 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
bd4c625c | 1003 | } |
ab17c4f0 JM |
1004 | |
1005 | if (privroot->d_inode) { | |
48b32a35 | 1006 | s->s_xattr = reiserfs_xattr_handlers; |
c72e0575 | 1007 | reiserfs_mutex_lock_safe(&privroot->d_inode->i_mutex, s); |
ab17c4f0 JM |
1008 | if (!REISERFS_SB(s)->xattr_root) { |
1009 | struct dentry *dentry; | |
1010 | dentry = lookup_one_len(XAROOT_NAME, privroot, | |
1011 | strlen(XAROOT_NAME)); | |
1012 | if (!IS_ERR(dentry)) | |
1013 | REISERFS_SB(s)->xattr_root = dentry; | |
1014 | else | |
1015 | err = PTR_ERR(dentry); | |
1016 | } | |
1017 | mutex_unlock(&privroot->d_inode->i_mutex); | |
1018 | } | |
48b32a35 | 1019 | |
a72bdb1c | 1020 | error: |
bd4c625c | 1021 | if (err) { |
bd4c625c LT |
1022 | clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt)); |
1023 | clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt)); | |
1024 | } | |
1025 | ||
1026 | /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */ | |
bd4c625c LT |
1027 | if (reiserfs_posixacl(s)) |
1028 | s->s_flags |= MS_POSIXACL; | |
ab17c4f0 | 1029 | else |
ab17c4f0 | 1030 | s->s_flags &= ~MS_POSIXACL; |
bd4c625c LT |
1031 | |
1032 | return err; | |
1da177e4 | 1033 | } |