Commit | Line | Data |
---|---|---|
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 | ||
36 | #include <linux/reiserfs_fs.h> | |
16f7e0fe | 37 | #include <linux/capability.h> |
1da177e4 LT |
38 | #include <linux/dcache.h> |
39 | #include <linux/namei.h> | |
40 | #include <linux/errno.h> | |
41 | #include <linux/fs.h> | |
42 | #include <linux/file.h> | |
43 | #include <linux/pagemap.h> | |
44 | #include <linux/xattr.h> | |
45 | #include <linux/reiserfs_xattr.h> | |
46 | #include <linux/reiserfs_acl.h> | |
1da177e4 | 47 | #include <asm/uaccess.h> |
3277c39f | 48 | #include <net/checksum.h> |
1da177e4 LT |
49 | #include <linux/smp_lock.h> |
50 | #include <linux/stat.h> | |
6c17675e | 51 | #include <linux/quotaops.h> |
1da177e4 | 52 | |
1da177e4 LT |
53 | #define PRIVROOT_NAME ".reiserfs_priv" |
54 | #define XAROOT_NAME "xattrs" | |
55 | ||
1da177e4 | 56 | |
6c17675e JM |
57 | /* Helpers for inode ops. We do this so that we don't have all the VFS |
58 | * overhead and also for proper i_mutex annotation. | |
59 | * dir->i_mutex must be held for all of them. */ | |
3a355cc6 | 60 | #ifdef CONFIG_REISERFS_FS_XATTR |
6c17675e | 61 | static int xattr_create(struct inode *dir, struct dentry *dentry, int mode) |
1da177e4 | 62 | { |
6c17675e | 63 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
e1c50248 | 64 | vfs_dq_init(dir); |
6c17675e JM |
65 | return dir->i_op->create(dir, dentry, mode, NULL); |
66 | } | |
3a355cc6 | 67 | #endif |
bd4c625c | 68 | |
6c17675e JM |
69 | static int xattr_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
70 | { | |
71 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); | |
e1c50248 | 72 | vfs_dq_init(dir); |
6c17675e JM |
73 | return dir->i_op->mkdir(dir, dentry, mode); |
74 | } | |
bd4c625c | 75 | |
6c17675e JM |
76 | /* We use I_MUTEX_CHILD here to silence lockdep. It's safe because xattr |
77 | * mutation ops aren't called during rename or splace, which are the | |
78 | * only other users of I_MUTEX_CHILD. It violates the ordering, but that's | |
79 | * better than allocating another subclass just for this code. */ | |
80 | static int xattr_unlink(struct inode *dir, struct dentry *dentry) | |
81 | { | |
82 | int error; | |
83 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); | |
e1c50248 | 84 | vfs_dq_init(dir); |
bd4c625c | 85 | |
6c17675e JM |
86 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD); |
87 | error = dir->i_op->unlink(dir, dentry); | |
88 | mutex_unlock(&dentry->d_inode->i_mutex); | |
89 | ||
90 | if (!error) | |
91 | d_delete(dentry); | |
92 | return error; | |
93 | } | |
94 | ||
95 | static int xattr_rmdir(struct inode *dir, struct dentry *dentry) | |
96 | { | |
97 | int error; | |
98 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); | |
e1c50248 | 99 | vfs_dq_init(dir); |
6c17675e JM |
100 | |
101 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD); | |
102 | dentry_unhash(dentry); | |
103 | error = dir->i_op->rmdir(dir, dentry); | |
104 | if (!error) | |
105 | dentry->d_inode->i_flags |= S_DEAD; | |
106 | mutex_unlock(&dentry->d_inode->i_mutex); | |
107 | if (!error) | |
108 | d_delete(dentry); | |
109 | dput(dentry); | |
110 | ||
111 | return error; | |
112 | } | |
113 | ||
6c17675e JM |
114 | #define xattr_may_create(flags) (!flags || flags & XATTR_CREATE) |
115 | ||
116 | /* Returns and possibly creates the xattr dir. */ | |
117 | static struct dentry *lookup_or_create_dir(struct dentry *parent, | |
118 | const char *name, int flags) | |
119 | { | |
120 | struct dentry *dentry; | |
121 | BUG_ON(!parent); | |
122 | ||
5a6059c3 | 123 | mutex_lock_nested(&parent->d_inode->i_mutex, I_MUTEX_XATTR); |
6c17675e | 124 | dentry = lookup_one_len(name, parent, strlen(name)); |
5a6059c3 | 125 | if (!IS_ERR(dentry) && !dentry->d_inode) { |
9b7f3755 | 126 | int err = -ENODATA; |
6c17675e | 127 | |
5a6059c3 | 128 | if (xattr_may_create(flags)) |
6c17675e | 129 | err = xattr_mkdir(parent->d_inode, dentry, 0700); |
6c17675e | 130 | |
9b7f3755 | 131 | if (err) { |
6c17675e JM |
132 | dput(dentry); |
133 | dentry = ERR_PTR(err); | |
9b7f3755 | 134 | } |
bd4c625c | 135 | } |
5a6059c3 | 136 | mutex_unlock(&parent->d_inode->i_mutex); |
6c17675e JM |
137 | return dentry; |
138 | } | |
139 | ||
140 | static struct dentry *open_xa_root(struct super_block *sb, int flags) | |
141 | { | |
142 | struct dentry *privroot = REISERFS_SB(sb)->priv_root; | |
143 | if (!privroot) | |
144 | return ERR_PTR(-ENODATA); | |
145 | return lookup_or_create_dir(privroot, XAROOT_NAME, flags); | |
1da177e4 LT |
146 | } |
147 | ||
bd4c625c | 148 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
1da177e4 | 149 | { |
bd4c625c LT |
150 | struct dentry *xaroot, *xadir; |
151 | char namebuf[17]; | |
152 | ||
6c17675e | 153 | xaroot = open_xa_root(inode->i_sb, flags); |
9b7f3755 | 154 | if (IS_ERR(xaroot)) |
bd4c625c | 155 | return xaroot; |
bd4c625c | 156 | |
bd4c625c LT |
157 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
158 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), | |
159 | inode->i_generation); | |
bd4c625c | 160 | |
6c17675e | 161 | xadir = lookup_or_create_dir(xaroot, namebuf, flags); |
bd4c625c LT |
162 | dput(xaroot); |
163 | return xadir; | |
6c17675e | 164 | |
1da177e4 LT |
165 | } |
166 | ||
48b32a35 JM |
167 | /* The following are side effects of other operations that aren't explicitly |
168 | * modifying extended attributes. This includes operations such as permissions | |
169 | * or ownership changes, object deletions, etc. */ | |
a41f1a47 JM |
170 | struct reiserfs_dentry_buf { |
171 | struct dentry *xadir; | |
172 | int count; | |
173 | struct dentry *dentries[8]; | |
174 | }; | |
bd4c625c | 175 | |
a72bdb1c | 176 | static int |
a41f1a47 JM |
177 | fill_with_dentries(void *buf, const char *name, int namelen, loff_t offset, |
178 | u64 ino, unsigned int d_type) | |
a72bdb1c | 179 | { |
a41f1a47 | 180 | struct reiserfs_dentry_buf *dbuf = buf; |
a72bdb1c | 181 | struct dentry *dentry; |
5a6059c3 | 182 | WARN_ON_ONCE(!mutex_is_locked(&dbuf->xadir->d_inode->i_mutex)); |
bd4c625c | 183 | |
a41f1a47 JM |
184 | if (dbuf->count == ARRAY_SIZE(dbuf->dentries)) |
185 | return -ENOSPC; | |
bd4c625c | 186 | |
a41f1a47 JM |
187 | if (name[0] == '.' && (name[1] == '\0' || |
188 | (name[1] == '.' && name[2] == '\0'))) | |
189 | return 0; | |
bd4c625c | 190 | |
a41f1a47 | 191 | dentry = lookup_one_len(name, dbuf->xadir, namelen); |
a72bdb1c | 192 | if (IS_ERR(dentry)) { |
a41f1a47 | 193 | return PTR_ERR(dentry); |
a72bdb1c | 194 | } else if (!dentry->d_inode) { |
a41f1a47 JM |
195 | /* A directory entry exists, but no file? */ |
196 | reiserfs_error(dentry->d_sb, "xattr-20003", | |
197 | "Corrupted directory: xattr %s listed but " | |
198 | "not found for file %s.\n", | |
199 | dentry->d_name.name, dbuf->xadir->d_name.name); | |
200 | dput(dentry); | |
201 | return -EIO; | |
bd4c625c | 202 | } |
1da177e4 | 203 | |
a41f1a47 JM |
204 | dbuf->dentries[dbuf->count++] = dentry; |
205 | return 0; | |
1da177e4 LT |
206 | } |
207 | ||
a41f1a47 JM |
208 | static void |
209 | cleanup_dentry_buf(struct reiserfs_dentry_buf *buf) | |
1da177e4 | 210 | { |
a41f1a47 JM |
211 | int i; |
212 | for (i = 0; i < buf->count; i++) | |
213 | if (buf->dentries[i]) | |
214 | dput(buf->dentries[i]); | |
a72bdb1c JM |
215 | } |
216 | ||
a41f1a47 JM |
217 | static int reiserfs_for_each_xattr(struct inode *inode, |
218 | int (*action)(struct dentry *, void *), | |
219 | void *data) | |
a72bdb1c | 220 | { |
a41f1a47 JM |
221 | struct dentry *dir; |
222 | int i, err = 0; | |
223 | loff_t pos = 0; | |
224 | struct reiserfs_dentry_buf buf = { | |
225 | .count = 0, | |
226 | }; | |
1da177e4 | 227 | |
a72bdb1c JM |
228 | /* Skip out, an xattr has no xattrs associated with it */ |
229 | if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1) | |
230 | return 0; | |
1da177e4 | 231 | |
6c17675e | 232 | dir = open_xa_dir(inode, XATTR_REPLACE); |
a72bdb1c JM |
233 | if (IS_ERR(dir)) { |
234 | err = PTR_ERR(dir); | |
235 | goto out; | |
236 | } else if (!dir->d_inode) { | |
a41f1a47 JM |
237 | err = 0; |
238 | goto out_dir; | |
a72bdb1c | 239 | } |
1da177e4 | 240 | |
6c17675e | 241 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
a41f1a47 JM |
242 | buf.xadir = dir; |
243 | err = reiserfs_readdir_dentry(dir, &buf, fill_with_dentries, &pos); | |
244 | while ((err == 0 || err == -ENOSPC) && buf.count) { | |
245 | err = 0; | |
1da177e4 | 246 | |
a41f1a47 JM |
247 | for (i = 0; i < buf.count && buf.dentries[i]; i++) { |
248 | int lerr = 0; | |
249 | struct dentry *dentry = buf.dentries[i]; | |
1da177e4 | 250 | |
a41f1a47 JM |
251 | if (err == 0 && !S_ISDIR(dentry->d_inode->i_mode)) |
252 | lerr = action(dentry, data); | |
1da177e4 | 253 | |
a41f1a47 JM |
254 | dput(dentry); |
255 | buf.dentries[i] = NULL; | |
256 | err = lerr ?: err; | |
bd4c625c | 257 | } |
a41f1a47 JM |
258 | buf.count = 0; |
259 | if (!err) | |
260 | err = reiserfs_readdir_dentry(dir, &buf, | |
261 | fill_with_dentries, &pos); | |
8b6dd72a | 262 | } |
a41f1a47 | 263 | mutex_unlock(&dir->d_inode->i_mutex); |
1da177e4 | 264 | |
a41f1a47 JM |
265 | /* Clean up after a failed readdir */ |
266 | cleanup_dentry_buf(&buf); | |
1da177e4 | 267 | |
d984561b | 268 | if (!err) { |
a41f1a47 JM |
269 | /* We start a transaction here to avoid a ABBA situation |
270 | * between the xattr root's i_mutex and the journal lock. | |
271 | * This doesn't incur much additional overhead since the | |
272 | * new transaction will just nest inside the | |
273 | * outer transaction. */ | |
274 | int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + | |
275 | 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); | |
276 | struct reiserfs_transaction_handle th; | |
277 | err = journal_begin(&th, inode->i_sb, blocks); | |
278 | if (!err) { | |
279 | int jerror; | |
280 | mutex_lock_nested(&dir->d_parent->d_inode->i_mutex, | |
281 | I_MUTEX_XATTR); | |
282 | err = action(dir, data); | |
283 | jerror = journal_end(&th, inode->i_sb, blocks); | |
284 | mutex_unlock(&dir->d_parent->d_inode->i_mutex); | |
285 | err = jerror ?: err; | |
286 | } | |
a72bdb1c | 287 | } |
a41f1a47 JM |
288 | out_dir: |
289 | dput(dir); | |
a72bdb1c | 290 | out: |
a41f1a47 JM |
291 | /* -ENODATA isn't an error */ |
292 | if (err == -ENODATA) | |
293 | err = 0; | |
a72bdb1c JM |
294 | return err; |
295 | } | |
1da177e4 | 296 | |
a41f1a47 | 297 | static int delete_one_xattr(struct dentry *dentry, void *data) |
a72bdb1c | 298 | { |
a41f1a47 | 299 | struct inode *dir = dentry->d_parent->d_inode; |
1da177e4 | 300 | |
a41f1a47 JM |
301 | /* This is the xattr dir, handle specially. */ |
302 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
303 | return xattr_rmdir(dir, dentry); | |
1da177e4 | 304 | |
a41f1a47 JM |
305 | return xattr_unlink(dir, dentry); |
306 | } | |
bd4c625c | 307 | |
a41f1a47 JM |
308 | static int chown_one_xattr(struct dentry *dentry, void *data) |
309 | { | |
310 | struct iattr *attrs = data; | |
311 | return reiserfs_setattr(dentry, attrs); | |
312 | } | |
1da177e4 | 313 | |
a41f1a47 JM |
314 | /* No i_mutex, but the inode is unconnected. */ |
315 | int reiserfs_delete_xattrs(struct inode *inode) | |
316 | { | |
317 | int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); | |
318 | if (err) | |
319 | reiserfs_warning(inode->i_sb, "jdm-20004", | |
320 | "Couldn't delete all xattrs (%d)\n", err); | |
a72bdb1c JM |
321 | return err; |
322 | } | |
1da177e4 | 323 | |
a41f1a47 | 324 | /* inode->i_mutex: down */ |
a72bdb1c JM |
325 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
326 | { | |
a41f1a47 | 327 | int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); |
8b6dd72a JM |
328 | if (err) |
329 | reiserfs_warning(inode->i_sb, "jdm-20007", | |
330 | "Couldn't chown all xattrs (%d)\n", err); | |
a72bdb1c | 331 | return err; |
1da177e4 LT |
332 | } |
333 | ||
a72bdb1c | 334 | #ifdef CONFIG_REISERFS_FS_XATTR |
a72bdb1c JM |
335 | /* Returns a dentry corresponding to a specific extended attribute file |
336 | * for the inode. If flags allow, the file is created. Otherwise, a | |
337 | * valid or negative dentry, or an error is returned. */ | |
48b32a35 JM |
338 | static struct dentry *xattr_lookup(struct inode *inode, const char *name, |
339 | int flags) | |
1da177e4 | 340 | { |
a72bdb1c JM |
341 | struct dentry *xadir, *xafile; |
342 | int err = 0; | |
343 | ||
344 | xadir = open_xa_dir(inode, flags); | |
6c17675e | 345 | if (IS_ERR(xadir)) |
a72bdb1c | 346 | return ERR_CAST(xadir); |
a72bdb1c | 347 | |
5a6059c3 | 348 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
a72bdb1c JM |
349 | xafile = lookup_one_len(name, xadir, strlen(name)); |
350 | if (IS_ERR(xafile)) { | |
6c17675e JM |
351 | err = PTR_ERR(xafile); |
352 | goto out; | |
bd4c625c | 353 | } |
a72bdb1c | 354 | |
6c17675e JM |
355 | if (xafile->d_inode && (flags & XATTR_CREATE)) |
356 | err = -EEXIST; | |
a72bdb1c | 357 | |
6c17675e JM |
358 | if (!xafile->d_inode) { |
359 | err = -ENODATA; | |
5a6059c3 | 360 | if (xattr_may_create(flags)) |
6c17675e JM |
361 | err = xattr_create(xadir->d_inode, xafile, |
362 | 0700|S_IFREG); | |
a72bdb1c JM |
363 | } |
364 | ||
6c17675e JM |
365 | if (err) |
366 | dput(xafile); | |
a72bdb1c | 367 | out: |
5a6059c3 | 368 | mutex_unlock(&xadir->d_inode->i_mutex); |
a72bdb1c JM |
369 | dput(xadir); |
370 | if (err) | |
6c17675e | 371 | return ERR_PTR(err); |
a72bdb1c | 372 | return xafile; |
1da177e4 LT |
373 | } |
374 | ||
1da177e4 | 375 | /* Internal operations on file data */ |
bd4c625c | 376 | static inline void reiserfs_put_page(struct page *page) |
1da177e4 | 377 | { |
bd4c625c LT |
378 | kunmap(page); |
379 | page_cache_release(page); | |
1da177e4 LT |
380 | } |
381 | ||
ec6ea56b | 382 | static struct page *reiserfs_get_page(struct inode *dir, size_t n) |
1da177e4 | 383 | { |
bd4c625c LT |
384 | struct address_space *mapping = dir->i_mapping; |
385 | struct page *page; | |
386 | /* We can deadlock if we try to free dentries, | |
387 | and an unlink/rmdir has just occured - GFP_NOFS avoids this */ | |
c4cdd038 | 388 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
ec6ea56b | 389 | page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL); |
bd4c625c | 390 | if (!IS_ERR(page)) { |
bd4c625c | 391 | kmap(page); |
bd4c625c LT |
392 | if (PageError(page)) |
393 | goto fail; | |
394 | } | |
395 | return page; | |
396 | ||
397 | fail: | |
398 | reiserfs_put_page(page); | |
399 | return ERR_PTR(-EIO); | |
1da177e4 LT |
400 | } |
401 | ||
bd4c625c | 402 | static inline __u32 xattr_hash(const char *msg, int len) |
1da177e4 | 403 | { |
bd4c625c | 404 | return csum_partial(msg, len, 0); |
1da177e4 LT |
405 | } |
406 | ||
ba9d8cec VS |
407 | int reiserfs_commit_write(struct file *f, struct page *page, |
408 | unsigned from, unsigned to); | |
409 | int reiserfs_prepare_write(struct file *f, struct page *page, | |
410 | unsigned from, unsigned to); | |
411 | ||
48b32a35 JM |
412 | static void update_ctime(struct inode *inode) |
413 | { | |
414 | struct timespec now = current_fs_time(inode->i_sb); | |
415 | if (hlist_unhashed(&inode->i_hash) || !inode->i_nlink || | |
416 | timespec_equal(&inode->i_ctime, &now)) | |
417 | return; | |
418 | ||
419 | inode->i_ctime = CURRENT_TIME_SEC; | |
420 | mark_inode_dirty(inode); | |
421 | } | |
422 | ||
423 | static int lookup_and_delete_xattr(struct inode *inode, const char *name) | |
424 | { | |
425 | int err = 0; | |
426 | struct dentry *dentry, *xadir; | |
427 | ||
428 | xadir = open_xa_dir(inode, XATTR_REPLACE); | |
429 | if (IS_ERR(xadir)) | |
430 | return PTR_ERR(xadir); | |
431 | ||
5a6059c3 | 432 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
48b32a35 JM |
433 | dentry = lookup_one_len(name, xadir, strlen(name)); |
434 | if (IS_ERR(dentry)) { | |
435 | err = PTR_ERR(dentry); | |
436 | goto out_dput; | |
437 | } | |
438 | ||
439 | if (dentry->d_inode) { | |
48b32a35 | 440 | err = xattr_unlink(xadir->d_inode, dentry); |
48b32a35 JM |
441 | update_ctime(inode); |
442 | } | |
443 | ||
444 | dput(dentry); | |
445 | out_dput: | |
5a6059c3 | 446 | mutex_unlock(&xadir->d_inode->i_mutex); |
48b32a35 JM |
447 | dput(xadir); |
448 | return err; | |
449 | } | |
450 | ||
ba9d8cec | 451 | |
1da177e4 LT |
452 | /* Generic extended attribute operations that can be used by xa plugins */ |
453 | ||
454 | /* | |
1b1dcc1b | 455 | * inode->i_mutex: down |
1da177e4 LT |
456 | */ |
457 | int | |
0ab2621e JM |
458 | reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, |
459 | struct inode *inode, const char *name, | |
460 | const void *buffer, size_t buffer_size, int flags) | |
1da177e4 | 461 | { |
bd4c625c | 462 | int err = 0; |
3227e14c | 463 | struct dentry *dentry; |
bd4c625c LT |
464 | struct page *page; |
465 | char *data; | |
bd4c625c LT |
466 | size_t file_pos = 0; |
467 | size_t buffer_pos = 0; | |
48b32a35 | 468 | size_t new_size; |
bd4c625c LT |
469 | __u32 xahash = 0; |
470 | ||
bd4c625c LT |
471 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
472 | return -EOPNOTSUPP; | |
473 | ||
8b6dd72a | 474 | if (!buffer) |
48b32a35 | 475 | return lookup_and_delete_xattr(inode, name); |
bd4c625c | 476 | |
48b32a35 JM |
477 | dentry = xattr_lookup(inode, name, flags); |
478 | if (IS_ERR(dentry)) | |
479 | return PTR_ERR(dentry); | |
bd4c625c | 480 | |
8b6dd72a | 481 | down_write(&REISERFS_I(inode)->i_xattr_sem); |
bd4c625c | 482 | |
8b6dd72a | 483 | xahash = xattr_hash(buffer, buffer_size); |
bd4c625c LT |
484 | while (buffer_pos < buffer_size || buffer_pos == 0) { |
485 | size_t chunk; | |
486 | size_t skip = 0; | |
487 | size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1)); | |
488 | if (buffer_size - buffer_pos > PAGE_CACHE_SIZE) | |
489 | chunk = PAGE_CACHE_SIZE; | |
490 | else | |
491 | chunk = buffer_size - buffer_pos; | |
492 | ||
ec6ea56b | 493 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
494 | if (IS_ERR(page)) { |
495 | err = PTR_ERR(page); | |
48b32a35 | 496 | goto out_unlock; |
bd4c625c LT |
497 | } |
498 | ||
499 | lock_page(page); | |
500 | data = page_address(page); | |
501 | ||
502 | if (file_pos == 0) { | |
503 | struct reiserfs_xattr_header *rxh; | |
504 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
505 | if (chunk + skip > PAGE_CACHE_SIZE) | |
506 | chunk = PAGE_CACHE_SIZE - skip; | |
507 | rxh = (struct reiserfs_xattr_header *)data; | |
508 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); | |
509 | rxh->h_hash = cpu_to_le32(xahash); | |
510 | } | |
511 | ||
3227e14c | 512 | err = reiserfs_prepare_write(NULL, page, page_offset, |
ba9d8cec | 513 | page_offset + chunk + skip); |
bd4c625c LT |
514 | if (!err) { |
515 | if (buffer) | |
516 | memcpy(data + skip, buffer + buffer_pos, chunk); | |
3227e14c JM |
517 | err = reiserfs_commit_write(NULL, page, page_offset, |
518 | page_offset + chunk + | |
519 | skip); | |
bd4c625c LT |
520 | } |
521 | unlock_page(page); | |
522 | reiserfs_put_page(page); | |
523 | buffer_pos += chunk; | |
524 | file_pos += chunk; | |
525 | skip = 0; | |
526 | if (err || buffer_size == 0 || !buffer) | |
527 | break; | |
528 | } | |
529 | ||
48b32a35 JM |
530 | new_size = buffer_size + sizeof(struct reiserfs_xattr_header); |
531 | if (!err && new_size < i_size_read(dentry->d_inode)) { | |
532 | struct iattr newattrs = { | |
533 | .ia_ctime = current_fs_time(inode->i_sb), | |
534 | .ia_size = buffer_size, | |
535 | .ia_valid = ATTR_SIZE | ATTR_CTIME, | |
536 | }; | |
537 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR); | |
538 | down_write(&dentry->d_inode->i_alloc_sem); | |
539 | err = reiserfs_setattr(dentry, &newattrs); | |
540 | up_write(&dentry->d_inode->i_alloc_sem); | |
541 | mutex_unlock(&dentry->d_inode->i_mutex); | |
542 | } else | |
543 | update_ctime(inode); | |
544 | out_unlock: | |
8b6dd72a | 545 | up_write(&REISERFS_I(inode)->i_xattr_sem); |
3227e14c | 546 | dput(dentry); |
48b32a35 JM |
547 | return err; |
548 | } | |
bd4c625c | 549 | |
0ab2621e JM |
550 | /* We need to start a transaction to maintain lock ordering */ |
551 | int reiserfs_xattr_set(struct inode *inode, const char *name, | |
552 | const void *buffer, size_t buffer_size, int flags) | |
48b32a35 | 553 | { |
0ab2621e JM |
554 | |
555 | struct reiserfs_transaction_handle th; | |
556 | int error, error2; | |
557 | size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size); | |
558 | ||
559 | if (!(flags & XATTR_REPLACE)) | |
560 | jbegin_count += reiserfs_xattr_jcreate_nblocks(inode); | |
561 | ||
562 | reiserfs_write_lock(inode->i_sb); | |
563 | error = journal_begin(&th, inode->i_sb, jbegin_count); | |
564 | if (error) { | |
565 | reiserfs_write_unlock(inode->i_sb); | |
566 | return error; | |
1da177e4 | 567 | } |
bd4c625c | 568 | |
0ab2621e JM |
569 | error = reiserfs_xattr_set_handle(&th, inode, name, |
570 | buffer, buffer_size, flags); | |
bd4c625c | 571 | |
0ab2621e JM |
572 | error2 = journal_end(&th, inode->i_sb, jbegin_count); |
573 | if (error == 0) | |
574 | error = error2; | |
575 | reiserfs_write_unlock(inode->i_sb); | |
576 | ||
577 | return error; | |
1da177e4 LT |
578 | } |
579 | ||
580 | /* | |
1b1dcc1b | 581 | * inode->i_mutex: down |
1da177e4 LT |
582 | */ |
583 | int | |
48b32a35 | 584 | reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, |
bd4c625c | 585 | size_t buffer_size) |
1da177e4 | 586 | { |
bd4c625c | 587 | ssize_t err = 0; |
3227e14c | 588 | struct dentry *dentry; |
bd4c625c LT |
589 | size_t isize; |
590 | size_t file_pos = 0; | |
591 | size_t buffer_pos = 0; | |
592 | struct page *page; | |
bd4c625c LT |
593 | __u32 hash = 0; |
594 | ||
595 | if (name == NULL) | |
596 | return -EINVAL; | |
597 | ||
598 | /* We can't have xattrs attached to v1 items since they don't have | |
599 | * generation numbers */ | |
600 | if (get_inode_sd_version(inode) == STAT_DATA_V1) | |
601 | return -EOPNOTSUPP; | |
602 | ||
48b32a35 | 603 | dentry = xattr_lookup(inode, name, XATTR_REPLACE); |
3227e14c JM |
604 | if (IS_ERR(dentry)) { |
605 | err = PTR_ERR(dentry); | |
bd4c625c LT |
606 | goto out; |
607 | } | |
608 | ||
8b6dd72a | 609 | down_read(&REISERFS_I(inode)->i_xattr_sem); |
d984561b | 610 | |
f437c529 | 611 | isize = i_size_read(dentry->d_inode); |
bd4c625c LT |
612 | |
613 | /* Just return the size needed */ | |
614 | if (buffer == NULL) { | |
615 | err = isize - sizeof(struct reiserfs_xattr_header); | |
8b6dd72a | 616 | goto out_unlock; |
bd4c625c LT |
617 | } |
618 | ||
619 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { | |
620 | err = -ERANGE; | |
8b6dd72a | 621 | goto out_unlock; |
bd4c625c LT |
622 | } |
623 | ||
624 | while (file_pos < isize) { | |
625 | size_t chunk; | |
626 | char *data; | |
627 | size_t skip = 0; | |
628 | if (isize - file_pos > PAGE_CACHE_SIZE) | |
629 | chunk = PAGE_CACHE_SIZE; | |
630 | else | |
631 | chunk = isize - file_pos; | |
632 | ||
a72bdb1c | 633 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
634 | if (IS_ERR(page)) { |
635 | err = PTR_ERR(page); | |
8b6dd72a | 636 | goto out_unlock; |
bd4c625c LT |
637 | } |
638 | ||
639 | lock_page(page); | |
640 | data = page_address(page); | |
641 | if (file_pos == 0) { | |
642 | struct reiserfs_xattr_header *rxh = | |
643 | (struct reiserfs_xattr_header *)data; | |
644 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
645 | chunk -= skip; | |
646 | /* Magic doesn't match up.. */ | |
647 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { | |
648 | unlock_page(page); | |
649 | reiserfs_put_page(page); | |
a72bdb1c | 650 | reiserfs_warning(inode->i_sb, "jdm-20001", |
bd4c625c LT |
651 | "Invalid magic for xattr (%s) " |
652 | "associated with %k", name, | |
653 | INODE_PKEY(inode)); | |
654 | err = -EIO; | |
8b6dd72a | 655 | goto out_unlock; |
bd4c625c LT |
656 | } |
657 | hash = le32_to_cpu(rxh->h_hash); | |
658 | } | |
659 | memcpy(buffer + buffer_pos, data + skip, chunk); | |
660 | unlock_page(page); | |
661 | reiserfs_put_page(page); | |
662 | file_pos += chunk; | |
663 | buffer_pos += chunk; | |
664 | skip = 0; | |
665 | } | |
666 | err = isize - sizeof(struct reiserfs_xattr_header); | |
667 | ||
668 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != | |
669 | hash) { | |
a72bdb1c | 670 | reiserfs_warning(inode->i_sb, "jdm-20002", |
bd4c625c LT |
671 | "Invalid hash for xattr (%s) associated " |
672 | "with %k", name, INODE_PKEY(inode)); | |
673 | err = -EIO; | |
674 | } | |
675 | ||
8b6dd72a JM |
676 | out_unlock: |
677 | up_read(&REISERFS_I(inode)->i_xattr_sem); | |
3227e14c | 678 | dput(dentry); |
bd4c625c | 679 | |
a72bdb1c | 680 | out: |
bd4c625c | 681 | return err; |
1da177e4 LT |
682 | } |
683 | ||
48b32a35 JM |
684 | /* Actual operations that are exported to VFS-land */ |
685 | struct xattr_handler *reiserfs_xattr_handlers[] = { | |
686 | &reiserfs_xattr_user_handler, | |
687 | &reiserfs_xattr_trusted_handler, | |
688 | #ifdef CONFIG_REISERFS_FS_SECURITY | |
689 | &reiserfs_xattr_security_handler, | |
690 | #endif | |
691 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL | |
692 | &reiserfs_posix_acl_access_handler, | |
693 | &reiserfs_posix_acl_default_handler, | |
694 | #endif | |
695 | NULL | |
1da177e4 LT |
696 | }; |
697 | ||
48b32a35 JM |
698 | /* |
699 | * In order to implement different sets of xattr operations for each xattr | |
700 | * prefix with the generic xattr API, a filesystem should create a | |
701 | * null-terminated array of struct xattr_handler (one for each prefix) and | |
702 | * hang a pointer to it off of the s_xattr field of the superblock. | |
703 | * | |
704 | * The generic_fooxattr() functions will use this list to dispatch xattr | |
705 | * operations to the correct xattr_handler. | |
706 | */ | |
707 | #define for_each_xattr_handler(handlers, handler) \ | |
708 | for ((handler) = *(handlers)++; \ | |
709 | (handler) != NULL; \ | |
710 | (handler) = *(handlers)++) | |
1da177e4 | 711 | |
48b32a35 JM |
712 | /* This is the implementation for the xattr plugin infrastructure */ |
713 | static inline struct xattr_handler * | |
714 | find_xattr_handler_prefix(struct xattr_handler **handlers, | |
715 | const char *name) | |
1da177e4 | 716 | { |
48b32a35 | 717 | struct xattr_handler *xah; |
bd4c625c | 718 | |
48b32a35 JM |
719 | if (!handlers) |
720 | return NULL; | |
bd4c625c | 721 | |
48b32a35 JM |
722 | for_each_xattr_handler(handlers, xah) { |
723 | if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0) | |
724 | break; | |
bd4c625c LT |
725 | } |
726 | ||
48b32a35 | 727 | return xah; |
bd4c625c | 728 | } |
1da177e4 | 729 | |
1da177e4 LT |
730 | |
731 | /* | |
732 | * Inode operation getxattr() | |
1da177e4 LT |
733 | */ |
734 | ssize_t | |
bd4c625c LT |
735 | reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, |
736 | size_t size) | |
1da177e4 | 737 | { |
48b32a35 JM |
738 | struct inode *inode = dentry->d_inode; |
739 | struct xattr_handler *handler; | |
bd4c625c | 740 | |
48b32a35 JM |
741 | handler = find_xattr_handler_prefix(inode->i_sb->s_xattr, name); |
742 | ||
743 | if (!handler || get_inode_sd_version(inode) == STAT_DATA_V1) | |
bd4c625c LT |
744 | return -EOPNOTSUPP; |
745 | ||
48b32a35 | 746 | return handler->get(inode, name, buffer, size); |
1da177e4 LT |
747 | } |
748 | ||
1da177e4 LT |
749 | /* |
750 | * Inode operation setxattr() | |
751 | * | |
1b1dcc1b | 752 | * dentry->d_inode->i_mutex down |
1da177e4 LT |
753 | */ |
754 | int | |
bd4c625c LT |
755 | reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
756 | size_t size, int flags) | |
1da177e4 | 757 | { |
48b32a35 JM |
758 | struct inode *inode = dentry->d_inode; |
759 | struct xattr_handler *handler; | |
bd4c625c | 760 | |
48b32a35 JM |
761 | handler = find_xattr_handler_prefix(inode->i_sb->s_xattr, name); |
762 | ||
763 | if (!handler || get_inode_sd_version(inode) == STAT_DATA_V1) | |
bd4c625c LT |
764 | return -EOPNOTSUPP; |
765 | ||
48b32a35 | 766 | return handler->set(inode, name, value, size, flags); |
1da177e4 LT |
767 | } |
768 | ||
769 | /* | |
770 | * Inode operation removexattr() | |
771 | * | |
1b1dcc1b | 772 | * dentry->d_inode->i_mutex down |
1da177e4 | 773 | */ |
bd4c625c | 774 | int reiserfs_removexattr(struct dentry *dentry, const char *name) |
1da177e4 | 775 | { |
48b32a35 JM |
776 | struct inode *inode = dentry->d_inode; |
777 | struct xattr_handler *handler; | |
778 | handler = find_xattr_handler_prefix(inode->i_sb->s_xattr, name); | |
1da177e4 | 779 | |
48b32a35 | 780 | if (!handler || get_inode_sd_version(inode) == STAT_DATA_V1) |
bd4c625c | 781 | return -EOPNOTSUPP; |
1da177e4 | 782 | |
48b32a35 | 783 | return handler->set(inode, name, NULL, 0, XATTR_REPLACE); |
1da177e4 LT |
784 | } |
785 | ||
48b32a35 JM |
786 | struct listxattr_buf { |
787 | size_t size; | |
788 | size_t pos; | |
789 | char *buf; | |
790 | struct inode *inode; | |
1da177e4 LT |
791 | }; |
792 | ||
48b32a35 JM |
793 | static int listxattr_filler(void *buf, const char *name, int namelen, |
794 | loff_t offset, u64 ino, unsigned int d_type) | |
1da177e4 | 795 | { |
48b32a35 JM |
796 | struct listxattr_buf *b = (struct listxattr_buf *)buf; |
797 | size_t size; | |
798 | if (name[0] != '.' || | |
799 | (namelen != 1 && (name[1] != '.' || namelen != 2))) { | |
800 | struct xattr_handler *handler; | |
801 | handler = find_xattr_handler_prefix(b->inode->i_sb->s_xattr, | |
802 | name); | |
803 | if (!handler) /* Unsupported xattr name */ | |
804 | return 0; | |
805 | if (b->buf) { | |
806 | size = handler->list(b->inode, b->buf + b->pos, | |
807 | b->size, name, namelen); | |
808 | if (size > b->size) | |
809 | return -ERANGE; | |
810 | } else { | |
811 | size = handler->list(b->inode, NULL, 0, name, namelen); | |
bd4c625c | 812 | } |
bd4c625c | 813 | |
48b32a35 JM |
814 | b->pos += size; |
815 | } | |
bd4c625c | 816 | return 0; |
1da177e4 | 817 | } |
bd4c625c | 818 | |
1da177e4 LT |
819 | /* |
820 | * Inode operation listxattr() | |
821 | * | |
48b32a35 JM |
822 | * We totally ignore the generic listxattr here because it would be stupid |
823 | * not to. Since the xattrs are organized in a directory, we can just | |
824 | * readdir to find them. | |
1da177e4 | 825 | */ |
bd4c625c | 826 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
1da177e4 | 827 | { |
bd4c625c LT |
828 | struct dentry *dir; |
829 | int err = 0; | |
a41f1a47 | 830 | loff_t pos = 0; |
48b32a35 JM |
831 | struct listxattr_buf buf = { |
832 | .inode = dentry->d_inode, | |
833 | .buf = buffer, | |
834 | .size = buffer ? size : 0, | |
835 | }; | |
bd4c625c LT |
836 | |
837 | if (!dentry->d_inode) | |
838 | return -EINVAL; | |
839 | ||
840 | if (!reiserfs_xattrs(dentry->d_sb) || | |
841 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) | |
842 | return -EOPNOTSUPP; | |
843 | ||
6c17675e | 844 | dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE); |
bd4c625c LT |
845 | if (IS_ERR(dir)) { |
846 | err = PTR_ERR(dir); | |
847 | if (err == -ENODATA) | |
48b32a35 | 848 | err = 0; /* Not an error if there aren't any xattrs */ |
bd4c625c LT |
849 | goto out; |
850 | } | |
851 | ||
6c17675e | 852 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
a41f1a47 | 853 | err = reiserfs_readdir_dentry(dir, &buf, listxattr_filler, &pos); |
6c17675e | 854 | mutex_unlock(&dir->d_inode->i_mutex); |
bd4c625c | 855 | |
48b32a35 JM |
856 | if (!err) |
857 | err = buf.pos; | |
bd4c625c | 858 | |
3227e14c | 859 | dput(dir); |
8b6dd72a | 860 | out: |
bd4c625c | 861 | return err; |
1da177e4 LT |
862 | } |
863 | ||
a72bdb1c | 864 | static int reiserfs_check_acl(struct inode *inode, int mask) |
1da177e4 | 865 | { |
a72bdb1c JM |
866 | struct posix_acl *acl; |
867 | int error = -EAGAIN; /* do regular unix permission checks by default */ | |
bd4c625c | 868 | |
a72bdb1c JM |
869 | acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS); |
870 | ||
a72bdb1c JM |
871 | if (acl) { |
872 | if (!IS_ERR(acl)) { | |
873 | error = posix_acl_permission(inode, acl, mask); | |
874 | posix_acl_release(acl); | |
875 | } else if (PTR_ERR(acl) != -ENODATA) | |
876 | error = PTR_ERR(acl); | |
bd4c625c LT |
877 | } |
878 | ||
a72bdb1c | 879 | return error; |
1da177e4 LT |
880 | } |
881 | ||
a72bdb1c | 882 | int reiserfs_permission(struct inode *inode, int mask) |
1da177e4 | 883 | { |
a72bdb1c JM |
884 | /* |
885 | * We don't do permission checks on the internal objects. | |
886 | * Permissions are determined by the "owning" object. | |
887 | */ | |
888 | if (IS_PRIVATE(inode)) | |
889 | return 0; | |
890 | /* | |
891 | * Stat data v1 doesn't support ACLs. | |
892 | */ | |
893 | if (get_inode_sd_version(inode) == STAT_DATA_V1) | |
894 | return generic_permission(inode, mask, NULL); | |
895 | else | |
896 | return generic_permission(inode, mask, reiserfs_check_acl); | |
1da177e4 LT |
897 | } |
898 | ||
a72bdb1c | 899 | static int create_privroot(struct dentry *dentry) |
1da177e4 | 900 | { |
a72bdb1c JM |
901 | int err; |
902 | struct inode *inode = dentry->d_parent->d_inode; | |
5a6059c3 JM |
903 | WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex)); |
904 | ||
6c17675e | 905 | err = xattr_mkdir(inode, dentry, 0700); |
edcc37a0 AV |
906 | if (err || !dentry->d_inode) { |
907 | reiserfs_warning(dentry->d_sb, "jdm-20006", | |
908 | "xattrs/ACLs enabled and couldn't " | |
909 | "find/create .reiserfs_priv. " | |
910 | "Failing mount."); | |
911 | return -EOPNOTSUPP; | |
bd4c625c LT |
912 | } |
913 | ||
edcc37a0 AV |
914 | dentry->d_inode->i_flags |= S_PRIVATE; |
915 | reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr " | |
916 | "storage.\n", PRIVROOT_NAME); | |
bd4c625c | 917 | |
edcc37a0 | 918 | return 0; |
1da177e4 LT |
919 | } |
920 | ||
a72bdb1c | 921 | static int xattr_mount_check(struct super_block *s) |
1da177e4 | 922 | { |
a72bdb1c JM |
923 | /* We need generation numbers to ensure that the oid mapping is correct |
924 | * v3.5 filesystems don't have them. */ | |
48b32a35 JM |
925 | if (old_format_only(s)) { |
926 | if (reiserfs_xattrs_optional(s)) { | |
927 | /* Old format filesystem, but optional xattrs have | |
928 | * been enabled. Error out. */ | |
929 | reiserfs_warning(s, "jdm-2005", | |
930 | "xattrs/ACLs not supported " | |
931 | "on pre-v3.6 format filesystems. " | |
932 | "Failing mount."); | |
933 | return -EOPNOTSUPP; | |
934 | } | |
a72bdb1c JM |
935 | } |
936 | ||
937 | return 0; | |
1da177e4 LT |
938 | } |
939 | ||
a72bdb1c JM |
940 | #else |
941 | int __init reiserfs_xattr_register_handlers(void) { return 0; } | |
942 | void reiserfs_xattr_unregister_handlers(void) {} | |
943 | #endif | |
944 | ||
1da177e4 LT |
945 | /* This will catch lookups from the fs root to .reiserfs_priv */ |
946 | static int | |
bd4c625c | 947 | xattr_lookup_poison(struct dentry *dentry, struct qstr *q1, struct qstr *name) |
1da177e4 | 948 | { |
bd4c625c | 949 | struct dentry *priv_root = REISERFS_SB(dentry->d_sb)->priv_root; |
edcc37a0 | 950 | if (container_of(q1, struct dentry, d_name) == priv_root) |
bd4c625c | 951 | return -ENOENT; |
edcc37a0 | 952 | if (q1->len == name->len && |
bd4c625c LT |
953 | !memcmp(q1->name, name->name, name->len)) |
954 | return 0; | |
955 | return 1; | |
1da177e4 LT |
956 | } |
957 | ||
e16404ed | 958 | static const struct dentry_operations xattr_lookup_poison_ops = { |
bd4c625c | 959 | .d_compare = xattr_lookup_poison, |
1da177e4 LT |
960 | }; |
961 | ||
edcc37a0 AV |
962 | int reiserfs_lookup_privroot(struct super_block *s) |
963 | { | |
964 | struct dentry *dentry; | |
965 | int err = 0; | |
966 | ||
967 | /* If we don't have the privroot located yet - go find it */ | |
968 | mutex_lock(&s->s_root->d_inode->i_mutex); | |
969 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, | |
970 | strlen(PRIVROOT_NAME)); | |
971 | if (!IS_ERR(dentry)) { | |
972 | REISERFS_SB(s)->priv_root = dentry; | |
973 | s->s_root->d_op = &xattr_lookup_poison_ops; | |
974 | if (dentry->d_inode) | |
975 | dentry->d_inode->i_flags |= S_PRIVATE; | |
976 | } else | |
977 | err = PTR_ERR(dentry); | |
978 | mutex_unlock(&s->s_root->d_inode->i_mutex); | |
979 | ||
980 | return err; | |
981 | } | |
982 | ||
1da177e4 LT |
983 | /* We need to take a copy of the mount flags since things like |
984 | * MS_RDONLY don't get set until *after* we're called. | |
985 | * mount_flags != mount_options */ | |
bd4c625c | 986 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
1da177e4 | 987 | { |
bd4c625c LT |
988 | int err = 0; |
989 | ||
a72bdb1c JM |
990 | #ifdef CONFIG_REISERFS_FS_XATTR |
991 | err = xattr_mount_check(s); | |
992 | if (err) | |
bd4c625c | 993 | goto error; |
bd4c625c | 994 | |
edcc37a0 AV |
995 | if (!REISERFS_SB(s)->priv_root->d_inode && !(mount_flags & MS_RDONLY)) { |
996 | mutex_lock(&s->s_root->d_inode->i_mutex); | |
997 | err = create_privroot(REISERFS_SB(s)->priv_root); | |
5a6059c3 | 998 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
bd4c625c | 999 | } |
48b32a35 JM |
1000 | if (!err) |
1001 | s->s_xattr = reiserfs_xattr_handlers; | |
1002 | ||
a72bdb1c | 1003 | error: |
bd4c625c | 1004 | if (err) { |
bd4c625c LT |
1005 | clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt)); |
1006 | clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt)); | |
1007 | } | |
a72bdb1c | 1008 | #endif |
bd4c625c LT |
1009 | |
1010 | /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */ | |
1011 | s->s_flags = s->s_flags & ~MS_POSIXACL; | |
a72bdb1c | 1012 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL |
bd4c625c LT |
1013 | if (reiserfs_posixacl(s)) |
1014 | s->s_flags |= MS_POSIXACL; | |
a72bdb1c | 1015 | #endif |
bd4c625c LT |
1016 | |
1017 | return err; | |
1da177e4 | 1018 | } |