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. */ | |
60 | static int xattr_create(struct inode *dir, struct dentry *dentry, int mode) | |
1da177e4 | 61 | { |
6c17675e | 62 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
e1c50248 | 63 | vfs_dq_init(dir); |
6c17675e JM |
64 | return dir->i_op->create(dir, dentry, mode, NULL); |
65 | } | |
bd4c625c | 66 | |
6c17675e JM |
67 | static int xattr_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
68 | { | |
69 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); | |
e1c50248 | 70 | vfs_dq_init(dir); |
6c17675e JM |
71 | return dir->i_op->mkdir(dir, dentry, mode); |
72 | } | |
bd4c625c | 73 | |
6c17675e JM |
74 | /* We use I_MUTEX_CHILD here to silence lockdep. It's safe because xattr |
75 | * mutation ops aren't called during rename or splace, which are the | |
76 | * only other users of I_MUTEX_CHILD. It violates the ordering, but that's | |
77 | * better than allocating another subclass just for this code. */ | |
78 | static int xattr_unlink(struct inode *dir, struct dentry *dentry) | |
79 | { | |
80 | int error; | |
81 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); | |
e1c50248 | 82 | vfs_dq_init(dir); |
bd4c625c | 83 | |
6c17675e JM |
84 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD); |
85 | error = dir->i_op->unlink(dir, dentry); | |
86 | mutex_unlock(&dentry->d_inode->i_mutex); | |
87 | ||
88 | if (!error) | |
89 | d_delete(dentry); | |
90 | return error; | |
91 | } | |
92 | ||
93 | static int xattr_rmdir(struct inode *dir, struct dentry *dentry) | |
94 | { | |
95 | int error; | |
96 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); | |
e1c50248 | 97 | vfs_dq_init(dir); |
6c17675e JM |
98 | |
99 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD); | |
100 | dentry_unhash(dentry); | |
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); | |
107 | dput(dentry); | |
108 | ||
109 | return error; | |
110 | } | |
111 | ||
6c17675e JM |
112 | #define xattr_may_create(flags) (!flags || flags & XATTR_CREATE) |
113 | ||
114 | /* Returns and possibly creates the xattr dir. */ | |
115 | static struct dentry *lookup_or_create_dir(struct dentry *parent, | |
116 | const char *name, int flags) | |
117 | { | |
118 | struct dentry *dentry; | |
119 | BUG_ON(!parent); | |
120 | ||
121 | dentry = lookup_one_len(name, parent, strlen(name)); | |
122 | if (IS_ERR(dentry)) | |
123 | return dentry; | |
124 | else if (!dentry->d_inode) { | |
9b7f3755 | 125 | int err = -ENODATA; |
6c17675e JM |
126 | |
127 | if (xattr_may_create(flags)) { | |
128 | mutex_lock_nested(&parent->d_inode->i_mutex, | |
129 | I_MUTEX_XATTR); | |
130 | err = xattr_mkdir(parent->d_inode, dentry, 0700); | |
131 | mutex_unlock(&parent->d_inode->i_mutex); | |
132 | } | |
133 | ||
9b7f3755 | 134 | if (err) { |
6c17675e JM |
135 | dput(dentry); |
136 | dentry = ERR_PTR(err); | |
9b7f3755 | 137 | } |
bd4c625c | 138 | } |
bd4c625c | 139 | |
6c17675e JM |
140 | return dentry; |
141 | } | |
142 | ||
143 | static struct dentry *open_xa_root(struct super_block *sb, int flags) | |
144 | { | |
145 | struct dentry *privroot = REISERFS_SB(sb)->priv_root; | |
146 | if (!privroot) | |
147 | return ERR_PTR(-ENODATA); | |
148 | return lookup_or_create_dir(privroot, XAROOT_NAME, flags); | |
1da177e4 LT |
149 | } |
150 | ||
bd4c625c | 151 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
1da177e4 | 152 | { |
bd4c625c LT |
153 | struct dentry *xaroot, *xadir; |
154 | char namebuf[17]; | |
155 | ||
6c17675e | 156 | xaroot = open_xa_root(inode->i_sb, flags); |
9b7f3755 | 157 | if (IS_ERR(xaroot)) |
bd4c625c | 158 | return xaroot; |
bd4c625c | 159 | |
bd4c625c LT |
160 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
161 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), | |
162 | inode->i_generation); | |
bd4c625c | 163 | |
6c17675e | 164 | xadir = lookup_or_create_dir(xaroot, namebuf, flags); |
bd4c625c LT |
165 | dput(xaroot); |
166 | return xadir; | |
6c17675e | 167 | |
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; |
bd4c625c | 185 | |
a41f1a47 JM |
186 | if (dbuf->count == ARRAY_SIZE(dbuf->dentries)) |
187 | return -ENOSPC; | |
bd4c625c | 188 | |
a41f1a47 JM |
189 | if (name[0] == '.' && (name[1] == '\0' || |
190 | (name[1] == '.' && name[2] == '\0'))) | |
191 | return 0; | |
bd4c625c | 192 | |
a41f1a47 | 193 | dentry = lookup_one_len(name, dbuf->xadir, namelen); |
a72bdb1c | 194 | if (IS_ERR(dentry)) { |
a41f1a47 | 195 | return PTR_ERR(dentry); |
a72bdb1c | 196 | } else if (!dentry->d_inode) { |
a41f1a47 JM |
197 | /* A directory entry exists, but no file? */ |
198 | reiserfs_error(dentry->d_sb, "xattr-20003", | |
199 | "Corrupted directory: xattr %s listed but " | |
200 | "not found for file %s.\n", | |
201 | dentry->d_name.name, dbuf->xadir->d_name.name); | |
202 | dput(dentry); | |
203 | return -EIO; | |
bd4c625c | 204 | } |
1da177e4 | 205 | |
a41f1a47 JM |
206 | dbuf->dentries[dbuf->count++] = dentry; |
207 | return 0; | |
1da177e4 LT |
208 | } |
209 | ||
a41f1a47 JM |
210 | static void |
211 | cleanup_dentry_buf(struct reiserfs_dentry_buf *buf) | |
1da177e4 | 212 | { |
a41f1a47 JM |
213 | int i; |
214 | for (i = 0; i < buf->count; i++) | |
215 | if (buf->dentries[i]) | |
216 | dput(buf->dentries[i]); | |
a72bdb1c JM |
217 | } |
218 | ||
a41f1a47 JM |
219 | static int reiserfs_for_each_xattr(struct inode *inode, |
220 | int (*action)(struct dentry *, void *), | |
221 | void *data) | |
a72bdb1c | 222 | { |
a41f1a47 JM |
223 | struct dentry *dir; |
224 | int i, err = 0; | |
225 | loff_t pos = 0; | |
226 | struct reiserfs_dentry_buf buf = { | |
227 | .count = 0, | |
228 | }; | |
1da177e4 | 229 | |
a72bdb1c JM |
230 | /* Skip out, an xattr has no xattrs associated with it */ |
231 | if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1) | |
232 | return 0; | |
1da177e4 | 233 | |
6c17675e | 234 | dir = open_xa_dir(inode, XATTR_REPLACE); |
a72bdb1c JM |
235 | if (IS_ERR(dir)) { |
236 | err = PTR_ERR(dir); | |
237 | goto out; | |
238 | } else if (!dir->d_inode) { | |
a41f1a47 JM |
239 | err = 0; |
240 | goto out_dir; | |
a72bdb1c | 241 | } |
1da177e4 | 242 | |
6c17675e | 243 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
a41f1a47 JM |
244 | buf.xadir = dir; |
245 | err = reiserfs_readdir_dentry(dir, &buf, fill_with_dentries, &pos); | |
246 | while ((err == 0 || err == -ENOSPC) && buf.count) { | |
247 | err = 0; | |
1da177e4 | 248 | |
a41f1a47 JM |
249 | for (i = 0; i < buf.count && buf.dentries[i]; i++) { |
250 | int lerr = 0; | |
251 | struct dentry *dentry = buf.dentries[i]; | |
1da177e4 | 252 | |
a41f1a47 JM |
253 | if (err == 0 && !S_ISDIR(dentry->d_inode->i_mode)) |
254 | lerr = action(dentry, data); | |
1da177e4 | 255 | |
a41f1a47 JM |
256 | dput(dentry); |
257 | buf.dentries[i] = NULL; | |
258 | err = lerr ?: err; | |
bd4c625c | 259 | } |
a41f1a47 JM |
260 | buf.count = 0; |
261 | if (!err) | |
262 | err = reiserfs_readdir_dentry(dir, &buf, | |
263 | fill_with_dentries, &pos); | |
8b6dd72a | 264 | } |
a41f1a47 | 265 | mutex_unlock(&dir->d_inode->i_mutex); |
1da177e4 | 266 | |
a41f1a47 JM |
267 | /* Clean up after a failed readdir */ |
268 | cleanup_dentry_buf(&buf); | |
1da177e4 | 269 | |
d984561b | 270 | if (!err) { |
a41f1a47 JM |
271 | /* We start a transaction here to avoid a ABBA situation |
272 | * between the xattr root's i_mutex and the journal lock. | |
273 | * This doesn't incur much additional overhead since the | |
274 | * new transaction will just nest inside the | |
275 | * outer transaction. */ | |
276 | int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + | |
277 | 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); | |
278 | struct reiserfs_transaction_handle th; | |
279 | err = journal_begin(&th, inode->i_sb, blocks); | |
280 | if (!err) { | |
281 | int jerror; | |
282 | mutex_lock_nested(&dir->d_parent->d_inode->i_mutex, | |
283 | I_MUTEX_XATTR); | |
284 | err = action(dir, data); | |
285 | jerror = journal_end(&th, inode->i_sb, blocks); | |
286 | mutex_unlock(&dir->d_parent->d_inode->i_mutex); | |
287 | err = jerror ?: err; | |
288 | } | |
a72bdb1c | 289 | } |
a41f1a47 JM |
290 | out_dir: |
291 | dput(dir); | |
a72bdb1c | 292 | out: |
a41f1a47 JM |
293 | /* -ENODATA isn't an error */ |
294 | if (err == -ENODATA) | |
295 | err = 0; | |
a72bdb1c JM |
296 | return err; |
297 | } | |
1da177e4 | 298 | |
a41f1a47 | 299 | static int delete_one_xattr(struct dentry *dentry, void *data) |
a72bdb1c | 300 | { |
a41f1a47 | 301 | struct inode *dir = dentry->d_parent->d_inode; |
1da177e4 | 302 | |
a41f1a47 JM |
303 | /* This is the xattr dir, handle specially. */ |
304 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
305 | return xattr_rmdir(dir, dentry); | |
1da177e4 | 306 | |
a41f1a47 JM |
307 | return xattr_unlink(dir, dentry); |
308 | } | |
bd4c625c | 309 | |
a41f1a47 JM |
310 | static int chown_one_xattr(struct dentry *dentry, void *data) |
311 | { | |
312 | struct iattr *attrs = data; | |
313 | return reiserfs_setattr(dentry, attrs); | |
314 | } | |
1da177e4 | 315 | |
a41f1a47 JM |
316 | /* No i_mutex, but the inode is unconnected. */ |
317 | int reiserfs_delete_xattrs(struct inode *inode) | |
318 | { | |
319 | int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); | |
320 | if (err) | |
321 | reiserfs_warning(inode->i_sb, "jdm-20004", | |
322 | "Couldn't delete all xattrs (%d)\n", err); | |
a72bdb1c JM |
323 | return err; |
324 | } | |
1da177e4 | 325 | |
a41f1a47 | 326 | /* inode->i_mutex: down */ |
a72bdb1c JM |
327 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
328 | { | |
a41f1a47 | 329 | int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); |
8b6dd72a JM |
330 | if (err) |
331 | reiserfs_warning(inode->i_sb, "jdm-20007", | |
332 | "Couldn't chown all xattrs (%d)\n", err); | |
a72bdb1c | 333 | return err; |
1da177e4 LT |
334 | } |
335 | ||
a72bdb1c | 336 | #ifdef CONFIG_REISERFS_FS_XATTR |
a72bdb1c JM |
337 | /* Returns a dentry corresponding to a specific extended attribute file |
338 | * for the inode. If flags allow, the file is created. Otherwise, a | |
339 | * valid or negative dentry, or an error is returned. */ | |
48b32a35 JM |
340 | static struct dentry *xattr_lookup(struct inode *inode, const char *name, |
341 | int flags) | |
1da177e4 | 342 | { |
a72bdb1c JM |
343 | struct dentry *xadir, *xafile; |
344 | int err = 0; | |
345 | ||
346 | xadir = open_xa_dir(inode, flags); | |
6c17675e | 347 | if (IS_ERR(xadir)) |
a72bdb1c | 348 | return ERR_CAST(xadir); |
a72bdb1c JM |
349 | |
350 | xafile = lookup_one_len(name, xadir, strlen(name)); | |
351 | if (IS_ERR(xafile)) { | |
6c17675e JM |
352 | err = PTR_ERR(xafile); |
353 | goto out; | |
bd4c625c | 354 | } |
a72bdb1c | 355 | |
6c17675e JM |
356 | if (xafile->d_inode && (flags & XATTR_CREATE)) |
357 | err = -EEXIST; | |
a72bdb1c | 358 | |
6c17675e JM |
359 | if (!xafile->d_inode) { |
360 | err = -ENODATA; | |
361 | if (xattr_may_create(flags)) { | |
362 | mutex_lock_nested(&xadir->d_inode->i_mutex, | |
363 | I_MUTEX_XATTR); | |
364 | err = xattr_create(xadir->d_inode, xafile, | |
365 | 0700|S_IFREG); | |
366 | mutex_unlock(&xadir->d_inode->i_mutex); | |
a72bdb1c JM |
367 | } |
368 | } | |
369 | ||
6c17675e JM |
370 | if (err) |
371 | dput(xafile); | |
a72bdb1c JM |
372 | out: |
373 | dput(xadir); | |
374 | if (err) | |
6c17675e | 375 | return ERR_PTR(err); |
a72bdb1c | 376 | return xafile; |
1da177e4 LT |
377 | } |
378 | ||
1da177e4 | 379 | /* Internal operations on file data */ |
bd4c625c | 380 | static inline void reiserfs_put_page(struct page *page) |
1da177e4 | 381 | { |
bd4c625c LT |
382 | kunmap(page); |
383 | page_cache_release(page); | |
1da177e4 LT |
384 | } |
385 | ||
ec6ea56b | 386 | static struct page *reiserfs_get_page(struct inode *dir, size_t n) |
1da177e4 | 387 | { |
bd4c625c LT |
388 | struct address_space *mapping = dir->i_mapping; |
389 | struct page *page; | |
390 | /* We can deadlock if we try to free dentries, | |
391 | and an unlink/rmdir has just occured - GFP_NOFS avoids this */ | |
c4cdd038 | 392 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
ec6ea56b | 393 | page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL); |
bd4c625c | 394 | if (!IS_ERR(page)) { |
bd4c625c | 395 | kmap(page); |
bd4c625c LT |
396 | if (PageError(page)) |
397 | goto fail; | |
398 | } | |
399 | return page; | |
400 | ||
401 | fail: | |
402 | reiserfs_put_page(page); | |
403 | return ERR_PTR(-EIO); | |
1da177e4 LT |
404 | } |
405 | ||
bd4c625c | 406 | static inline __u32 xattr_hash(const char *msg, int len) |
1da177e4 | 407 | { |
bd4c625c | 408 | return csum_partial(msg, len, 0); |
1da177e4 LT |
409 | } |
410 | ||
ba9d8cec VS |
411 | int reiserfs_commit_write(struct file *f, struct page *page, |
412 | unsigned from, unsigned to); | |
413 | int reiserfs_prepare_write(struct file *f, struct page *page, | |
414 | unsigned from, unsigned to); | |
415 | ||
48b32a35 JM |
416 | static void update_ctime(struct inode *inode) |
417 | { | |
418 | struct timespec now = current_fs_time(inode->i_sb); | |
419 | if (hlist_unhashed(&inode->i_hash) || !inode->i_nlink || | |
420 | timespec_equal(&inode->i_ctime, &now)) | |
421 | return; | |
422 | ||
423 | inode->i_ctime = CURRENT_TIME_SEC; | |
424 | mark_inode_dirty(inode); | |
425 | } | |
426 | ||
427 | static int lookup_and_delete_xattr(struct inode *inode, const char *name) | |
428 | { | |
429 | int err = 0; | |
430 | struct dentry *dentry, *xadir; | |
431 | ||
432 | xadir = open_xa_dir(inode, XATTR_REPLACE); | |
433 | if (IS_ERR(xadir)) | |
434 | return PTR_ERR(xadir); | |
435 | ||
436 | dentry = lookup_one_len(name, xadir, strlen(name)); | |
437 | if (IS_ERR(dentry)) { | |
438 | err = PTR_ERR(dentry); | |
439 | goto out_dput; | |
440 | } | |
441 | ||
442 | if (dentry->d_inode) { | |
443 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); | |
444 | err = xattr_unlink(xadir->d_inode, dentry); | |
445 | mutex_unlock(&xadir->d_inode->i_mutex); | |
446 | update_ctime(inode); | |
447 | } | |
448 | ||
449 | dput(dentry); | |
450 | out_dput: | |
451 | dput(xadir); | |
452 | return err; | |
453 | } | |
454 | ||
ba9d8cec | 455 | |
1da177e4 LT |
456 | /* Generic extended attribute operations that can be used by xa plugins */ |
457 | ||
458 | /* | |
1b1dcc1b | 459 | * inode->i_mutex: down |
1da177e4 LT |
460 | */ |
461 | int | |
0ab2621e JM |
462 | reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, |
463 | struct inode *inode, const char *name, | |
464 | const void *buffer, size_t buffer_size, int flags) | |
1da177e4 | 465 | { |
bd4c625c | 466 | int err = 0; |
3227e14c | 467 | struct dentry *dentry; |
bd4c625c LT |
468 | struct page *page; |
469 | char *data; | |
bd4c625c LT |
470 | size_t file_pos = 0; |
471 | size_t buffer_pos = 0; | |
48b32a35 | 472 | size_t new_size; |
bd4c625c LT |
473 | __u32 xahash = 0; |
474 | ||
bd4c625c LT |
475 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
476 | return -EOPNOTSUPP; | |
477 | ||
8b6dd72a | 478 | if (!buffer) |
48b32a35 | 479 | return lookup_and_delete_xattr(inode, name); |
bd4c625c | 480 | |
48b32a35 JM |
481 | dentry = xattr_lookup(inode, name, flags); |
482 | if (IS_ERR(dentry)) | |
483 | return PTR_ERR(dentry); | |
bd4c625c | 484 | |
8b6dd72a | 485 | down_write(&REISERFS_I(inode)->i_xattr_sem); |
bd4c625c | 486 | |
8b6dd72a | 487 | xahash = xattr_hash(buffer, buffer_size); |
bd4c625c LT |
488 | while (buffer_pos < buffer_size || buffer_pos == 0) { |
489 | size_t chunk; | |
490 | size_t skip = 0; | |
491 | size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1)); | |
492 | if (buffer_size - buffer_pos > PAGE_CACHE_SIZE) | |
493 | chunk = PAGE_CACHE_SIZE; | |
494 | else | |
495 | chunk = buffer_size - buffer_pos; | |
496 | ||
ec6ea56b | 497 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
498 | if (IS_ERR(page)) { |
499 | err = PTR_ERR(page); | |
48b32a35 | 500 | goto out_unlock; |
bd4c625c LT |
501 | } |
502 | ||
503 | lock_page(page); | |
504 | data = page_address(page); | |
505 | ||
506 | if (file_pos == 0) { | |
507 | struct reiserfs_xattr_header *rxh; | |
508 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
509 | if (chunk + skip > PAGE_CACHE_SIZE) | |
510 | chunk = PAGE_CACHE_SIZE - skip; | |
511 | rxh = (struct reiserfs_xattr_header *)data; | |
512 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); | |
513 | rxh->h_hash = cpu_to_le32(xahash); | |
514 | } | |
515 | ||
3227e14c | 516 | err = reiserfs_prepare_write(NULL, page, page_offset, |
ba9d8cec | 517 | page_offset + chunk + skip); |
bd4c625c LT |
518 | if (!err) { |
519 | if (buffer) | |
520 | memcpy(data + skip, buffer + buffer_pos, chunk); | |
3227e14c JM |
521 | err = reiserfs_commit_write(NULL, page, page_offset, |
522 | page_offset + chunk + | |
523 | skip); | |
bd4c625c LT |
524 | } |
525 | unlock_page(page); | |
526 | reiserfs_put_page(page); | |
527 | buffer_pos += chunk; | |
528 | file_pos += chunk; | |
529 | skip = 0; | |
530 | if (err || buffer_size == 0 || !buffer) | |
531 | break; | |
532 | } | |
533 | ||
48b32a35 JM |
534 | new_size = buffer_size + sizeof(struct reiserfs_xattr_header); |
535 | if (!err && new_size < i_size_read(dentry->d_inode)) { | |
536 | struct iattr newattrs = { | |
537 | .ia_ctime = current_fs_time(inode->i_sb), | |
538 | .ia_size = buffer_size, | |
539 | .ia_valid = ATTR_SIZE | ATTR_CTIME, | |
540 | }; | |
541 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR); | |
542 | down_write(&dentry->d_inode->i_alloc_sem); | |
543 | err = reiserfs_setattr(dentry, &newattrs); | |
544 | up_write(&dentry->d_inode->i_alloc_sem); | |
545 | mutex_unlock(&dentry->d_inode->i_mutex); | |
546 | } else | |
547 | update_ctime(inode); | |
548 | out_unlock: | |
8b6dd72a | 549 | up_write(&REISERFS_I(inode)->i_xattr_sem); |
3227e14c | 550 | dput(dentry); |
48b32a35 JM |
551 | return err; |
552 | } | |
bd4c625c | 553 | |
0ab2621e JM |
554 | /* We need to start a transaction to maintain lock ordering */ |
555 | int reiserfs_xattr_set(struct inode *inode, const char *name, | |
556 | const void *buffer, size_t buffer_size, int flags) | |
48b32a35 | 557 | { |
0ab2621e JM |
558 | |
559 | struct reiserfs_transaction_handle th; | |
560 | int error, error2; | |
561 | size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size); | |
562 | ||
563 | if (!(flags & XATTR_REPLACE)) | |
564 | jbegin_count += reiserfs_xattr_jcreate_nblocks(inode); | |
565 | ||
566 | reiserfs_write_lock(inode->i_sb); | |
567 | error = journal_begin(&th, inode->i_sb, jbegin_count); | |
568 | if (error) { | |
569 | reiserfs_write_unlock(inode->i_sb); | |
570 | return error; | |
1da177e4 | 571 | } |
bd4c625c | 572 | |
0ab2621e JM |
573 | error = reiserfs_xattr_set_handle(&th, inode, name, |
574 | buffer, buffer_size, flags); | |
bd4c625c | 575 | |
0ab2621e JM |
576 | error2 = journal_end(&th, inode->i_sb, jbegin_count); |
577 | if (error == 0) | |
578 | error = error2; | |
579 | reiserfs_write_unlock(inode->i_sb); | |
580 | ||
581 | return error; | |
1da177e4 LT |
582 | } |
583 | ||
584 | /* | |
1b1dcc1b | 585 | * inode->i_mutex: down |
1da177e4 LT |
586 | */ |
587 | int | |
48b32a35 | 588 | reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, |
bd4c625c | 589 | size_t buffer_size) |
1da177e4 | 590 | { |
bd4c625c | 591 | ssize_t err = 0; |
3227e14c | 592 | struct dentry *dentry; |
bd4c625c LT |
593 | size_t isize; |
594 | size_t file_pos = 0; | |
595 | size_t buffer_pos = 0; | |
596 | struct page *page; | |
bd4c625c LT |
597 | __u32 hash = 0; |
598 | ||
599 | if (name == NULL) | |
600 | return -EINVAL; | |
601 | ||
602 | /* We can't have xattrs attached to v1 items since they don't have | |
603 | * generation numbers */ | |
604 | if (get_inode_sd_version(inode) == STAT_DATA_V1) | |
605 | return -EOPNOTSUPP; | |
606 | ||
48b32a35 | 607 | dentry = xattr_lookup(inode, name, XATTR_REPLACE); |
3227e14c JM |
608 | if (IS_ERR(dentry)) { |
609 | err = PTR_ERR(dentry); | |
bd4c625c LT |
610 | goto out; |
611 | } | |
612 | ||
8b6dd72a | 613 | down_read(&REISERFS_I(inode)->i_xattr_sem); |
d984561b | 614 | |
f437c529 | 615 | isize = i_size_read(dentry->d_inode); |
bd4c625c LT |
616 | |
617 | /* Just return the size needed */ | |
618 | if (buffer == NULL) { | |
619 | err = isize - sizeof(struct reiserfs_xattr_header); | |
8b6dd72a | 620 | goto out_unlock; |
bd4c625c LT |
621 | } |
622 | ||
623 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { | |
624 | err = -ERANGE; | |
8b6dd72a | 625 | goto out_unlock; |
bd4c625c LT |
626 | } |
627 | ||
628 | while (file_pos < isize) { | |
629 | size_t chunk; | |
630 | char *data; | |
631 | size_t skip = 0; | |
632 | if (isize - file_pos > PAGE_CACHE_SIZE) | |
633 | chunk = PAGE_CACHE_SIZE; | |
634 | else | |
635 | chunk = isize - file_pos; | |
636 | ||
a72bdb1c | 637 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
638 | if (IS_ERR(page)) { |
639 | err = PTR_ERR(page); | |
8b6dd72a | 640 | goto out_unlock; |
bd4c625c LT |
641 | } |
642 | ||
643 | lock_page(page); | |
644 | data = page_address(page); | |
645 | if (file_pos == 0) { | |
646 | struct reiserfs_xattr_header *rxh = | |
647 | (struct reiserfs_xattr_header *)data; | |
648 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
649 | chunk -= skip; | |
650 | /* Magic doesn't match up.. */ | |
651 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { | |
652 | unlock_page(page); | |
653 | reiserfs_put_page(page); | |
a72bdb1c | 654 | reiserfs_warning(inode->i_sb, "jdm-20001", |
bd4c625c LT |
655 | "Invalid magic for xattr (%s) " |
656 | "associated with %k", name, | |
657 | INODE_PKEY(inode)); | |
658 | err = -EIO; | |
8b6dd72a | 659 | goto out_unlock; |
bd4c625c LT |
660 | } |
661 | hash = le32_to_cpu(rxh->h_hash); | |
662 | } | |
663 | memcpy(buffer + buffer_pos, data + skip, chunk); | |
664 | unlock_page(page); | |
665 | reiserfs_put_page(page); | |
666 | file_pos += chunk; | |
667 | buffer_pos += chunk; | |
668 | skip = 0; | |
669 | } | |
670 | err = isize - sizeof(struct reiserfs_xattr_header); | |
671 | ||
672 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != | |
673 | hash) { | |
a72bdb1c | 674 | reiserfs_warning(inode->i_sb, "jdm-20002", |
bd4c625c LT |
675 | "Invalid hash for xattr (%s) associated " |
676 | "with %k", name, INODE_PKEY(inode)); | |
677 | err = -EIO; | |
678 | } | |
679 | ||
8b6dd72a JM |
680 | out_unlock: |
681 | up_read(&REISERFS_I(inode)->i_xattr_sem); | |
3227e14c | 682 | dput(dentry); |
bd4c625c | 683 | |
a72bdb1c | 684 | out: |
bd4c625c | 685 | return err; |
1da177e4 LT |
686 | } |
687 | ||
48b32a35 JM |
688 | /* Actual operations that are exported to VFS-land */ |
689 | struct xattr_handler *reiserfs_xattr_handlers[] = { | |
690 | &reiserfs_xattr_user_handler, | |
691 | &reiserfs_xattr_trusted_handler, | |
692 | #ifdef CONFIG_REISERFS_FS_SECURITY | |
693 | &reiserfs_xattr_security_handler, | |
694 | #endif | |
695 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL | |
696 | &reiserfs_posix_acl_access_handler, | |
697 | &reiserfs_posix_acl_default_handler, | |
698 | #endif | |
699 | NULL | |
1da177e4 LT |
700 | }; |
701 | ||
48b32a35 JM |
702 | /* |
703 | * In order to implement different sets of xattr operations for each xattr | |
704 | * prefix with the generic xattr API, a filesystem should create a | |
705 | * null-terminated array of struct xattr_handler (one for each prefix) and | |
706 | * hang a pointer to it off of the s_xattr field of the superblock. | |
707 | * | |
708 | * The generic_fooxattr() functions will use this list to dispatch xattr | |
709 | * operations to the correct xattr_handler. | |
710 | */ | |
711 | #define for_each_xattr_handler(handlers, handler) \ | |
712 | for ((handler) = *(handlers)++; \ | |
713 | (handler) != NULL; \ | |
714 | (handler) = *(handlers)++) | |
1da177e4 | 715 | |
48b32a35 JM |
716 | /* This is the implementation for the xattr plugin infrastructure */ |
717 | static inline struct xattr_handler * | |
718 | find_xattr_handler_prefix(struct xattr_handler **handlers, | |
719 | const char *name) | |
1da177e4 | 720 | { |
48b32a35 | 721 | struct xattr_handler *xah; |
bd4c625c | 722 | |
48b32a35 JM |
723 | if (!handlers) |
724 | return NULL; | |
bd4c625c | 725 | |
48b32a35 JM |
726 | for_each_xattr_handler(handlers, xah) { |
727 | if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0) | |
728 | break; | |
bd4c625c LT |
729 | } |
730 | ||
48b32a35 | 731 | return xah; |
bd4c625c | 732 | } |
1da177e4 | 733 | |
1da177e4 LT |
734 | |
735 | /* | |
736 | * Inode operation getxattr() | |
1da177e4 LT |
737 | */ |
738 | ssize_t | |
bd4c625c LT |
739 | reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, |
740 | size_t size) | |
1da177e4 | 741 | { |
48b32a35 JM |
742 | struct inode *inode = dentry->d_inode; |
743 | struct xattr_handler *handler; | |
bd4c625c | 744 | |
48b32a35 JM |
745 | handler = find_xattr_handler_prefix(inode->i_sb->s_xattr, name); |
746 | ||
747 | if (!handler || get_inode_sd_version(inode) == STAT_DATA_V1) | |
bd4c625c LT |
748 | return -EOPNOTSUPP; |
749 | ||
48b32a35 | 750 | return handler->get(inode, name, buffer, size); |
1da177e4 LT |
751 | } |
752 | ||
1da177e4 LT |
753 | /* |
754 | * Inode operation setxattr() | |
755 | * | |
1b1dcc1b | 756 | * dentry->d_inode->i_mutex down |
1da177e4 LT |
757 | */ |
758 | int | |
bd4c625c LT |
759 | reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
760 | size_t size, int flags) | |
1da177e4 | 761 | { |
48b32a35 JM |
762 | struct inode *inode = dentry->d_inode; |
763 | struct xattr_handler *handler; | |
bd4c625c | 764 | |
48b32a35 JM |
765 | handler = find_xattr_handler_prefix(inode->i_sb->s_xattr, name); |
766 | ||
767 | if (!handler || get_inode_sd_version(inode) == STAT_DATA_V1) | |
bd4c625c LT |
768 | return -EOPNOTSUPP; |
769 | ||
48b32a35 | 770 | return handler->set(inode, name, value, size, flags); |
1da177e4 LT |
771 | } |
772 | ||
773 | /* | |
774 | * Inode operation removexattr() | |
775 | * | |
1b1dcc1b | 776 | * dentry->d_inode->i_mutex down |
1da177e4 | 777 | */ |
bd4c625c | 778 | int reiserfs_removexattr(struct dentry *dentry, const char *name) |
1da177e4 | 779 | { |
48b32a35 JM |
780 | struct inode *inode = dentry->d_inode; |
781 | struct xattr_handler *handler; | |
782 | handler = find_xattr_handler_prefix(inode->i_sb->s_xattr, name); | |
1da177e4 | 783 | |
48b32a35 | 784 | if (!handler || get_inode_sd_version(inode) == STAT_DATA_V1) |
bd4c625c | 785 | return -EOPNOTSUPP; |
1da177e4 | 786 | |
48b32a35 | 787 | return handler->set(inode, name, NULL, 0, XATTR_REPLACE); |
1da177e4 LT |
788 | } |
789 | ||
48b32a35 JM |
790 | struct listxattr_buf { |
791 | size_t size; | |
792 | size_t pos; | |
793 | char *buf; | |
794 | struct inode *inode; | |
1da177e4 LT |
795 | }; |
796 | ||
48b32a35 JM |
797 | static int listxattr_filler(void *buf, const char *name, int namelen, |
798 | loff_t offset, u64 ino, unsigned int d_type) | |
1da177e4 | 799 | { |
48b32a35 JM |
800 | struct listxattr_buf *b = (struct listxattr_buf *)buf; |
801 | size_t size; | |
802 | if (name[0] != '.' || | |
803 | (namelen != 1 && (name[1] != '.' || namelen != 2))) { | |
804 | struct xattr_handler *handler; | |
805 | handler = find_xattr_handler_prefix(b->inode->i_sb->s_xattr, | |
806 | name); | |
807 | if (!handler) /* Unsupported xattr name */ | |
808 | return 0; | |
809 | if (b->buf) { | |
810 | size = handler->list(b->inode, b->buf + b->pos, | |
811 | b->size, name, namelen); | |
812 | if (size > b->size) | |
813 | return -ERANGE; | |
814 | } else { | |
815 | size = handler->list(b->inode, NULL, 0, name, namelen); | |
bd4c625c | 816 | } |
bd4c625c | 817 | |
48b32a35 JM |
818 | b->pos += size; |
819 | } | |
bd4c625c | 820 | return 0; |
1da177e4 | 821 | } |
bd4c625c | 822 | |
1da177e4 LT |
823 | /* |
824 | * Inode operation listxattr() | |
825 | * | |
48b32a35 JM |
826 | * We totally ignore the generic listxattr here because it would be stupid |
827 | * not to. Since the xattrs are organized in a directory, we can just | |
828 | * readdir to find them. | |
1da177e4 | 829 | */ |
bd4c625c | 830 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
1da177e4 | 831 | { |
bd4c625c LT |
832 | struct dentry *dir; |
833 | int err = 0; | |
a41f1a47 | 834 | loff_t pos = 0; |
48b32a35 JM |
835 | struct listxattr_buf buf = { |
836 | .inode = dentry->d_inode, | |
837 | .buf = buffer, | |
838 | .size = buffer ? size : 0, | |
839 | }; | |
bd4c625c LT |
840 | |
841 | if (!dentry->d_inode) | |
842 | return -EINVAL; | |
843 | ||
844 | if (!reiserfs_xattrs(dentry->d_sb) || | |
845 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) | |
846 | return -EOPNOTSUPP; | |
847 | ||
6c17675e | 848 | dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE); |
bd4c625c LT |
849 | if (IS_ERR(dir)) { |
850 | err = PTR_ERR(dir); | |
851 | if (err == -ENODATA) | |
48b32a35 | 852 | err = 0; /* Not an error if there aren't any xattrs */ |
bd4c625c LT |
853 | goto out; |
854 | } | |
855 | ||
6c17675e | 856 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
a41f1a47 | 857 | err = reiserfs_readdir_dentry(dir, &buf, listxattr_filler, &pos); |
6c17675e | 858 | mutex_unlock(&dir->d_inode->i_mutex); |
bd4c625c | 859 | |
48b32a35 JM |
860 | if (!err) |
861 | err = buf.pos; | |
bd4c625c | 862 | |
3227e14c | 863 | dput(dir); |
8b6dd72a | 864 | out: |
bd4c625c | 865 | return err; |
1da177e4 LT |
866 | } |
867 | ||
a72bdb1c | 868 | static int reiserfs_check_acl(struct inode *inode, int mask) |
1da177e4 | 869 | { |
a72bdb1c JM |
870 | struct posix_acl *acl; |
871 | int error = -EAGAIN; /* do regular unix permission checks by default */ | |
bd4c625c | 872 | |
a72bdb1c JM |
873 | acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS); |
874 | ||
a72bdb1c JM |
875 | if (acl) { |
876 | if (!IS_ERR(acl)) { | |
877 | error = posix_acl_permission(inode, acl, mask); | |
878 | posix_acl_release(acl); | |
879 | } else if (PTR_ERR(acl) != -ENODATA) | |
880 | error = PTR_ERR(acl); | |
bd4c625c LT |
881 | } |
882 | ||
a72bdb1c | 883 | return error; |
1da177e4 LT |
884 | } |
885 | ||
a72bdb1c | 886 | int reiserfs_permission(struct inode *inode, int mask) |
1da177e4 | 887 | { |
a72bdb1c JM |
888 | /* |
889 | * We don't do permission checks on the internal objects. | |
890 | * Permissions are determined by the "owning" object. | |
891 | */ | |
892 | if (IS_PRIVATE(inode)) | |
893 | return 0; | |
894 | /* | |
895 | * Stat data v1 doesn't support ACLs. | |
896 | */ | |
897 | if (get_inode_sd_version(inode) == STAT_DATA_V1) | |
898 | return generic_permission(inode, mask, NULL); | |
899 | else | |
900 | return generic_permission(inode, mask, reiserfs_check_acl); | |
1da177e4 LT |
901 | } |
902 | ||
a72bdb1c | 903 | static int create_privroot(struct dentry *dentry) |
1da177e4 | 904 | { |
a72bdb1c JM |
905 | int err; |
906 | struct inode *inode = dentry->d_parent->d_inode; | |
907 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_XATTR); | |
6c17675e | 908 | err = xattr_mkdir(inode, dentry, 0700); |
a72bdb1c JM |
909 | mutex_unlock(&inode->i_mutex); |
910 | if (err) { | |
911 | dput(dentry); | |
912 | dentry = NULL; | |
bd4c625c LT |
913 | } |
914 | ||
a72bdb1c JM |
915 | if (dentry && dentry->d_inode) |
916 | reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr " | |
917 | "storage.\n", PRIVROOT_NAME); | |
bd4c625c | 918 | |
bd4c625c | 919 | return err; |
1da177e4 LT |
920 | } |
921 | ||
a72bdb1c | 922 | static int xattr_mount_check(struct super_block *s) |
1da177e4 | 923 | { |
a72bdb1c JM |
924 | /* We need generation numbers to ensure that the oid mapping is correct |
925 | * v3.5 filesystems don't have them. */ | |
48b32a35 JM |
926 | if (old_format_only(s)) { |
927 | if (reiserfs_xattrs_optional(s)) { | |
928 | /* Old format filesystem, but optional xattrs have | |
929 | * been enabled. Error out. */ | |
930 | reiserfs_warning(s, "jdm-2005", | |
931 | "xattrs/ACLs not supported " | |
932 | "on pre-v3.6 format filesystems. " | |
933 | "Failing mount."); | |
934 | return -EOPNOTSUPP; | |
935 | } | |
a72bdb1c JM |
936 | } |
937 | ||
938 | return 0; | |
1da177e4 LT |
939 | } |
940 | ||
a72bdb1c JM |
941 | #else |
942 | int __init reiserfs_xattr_register_handlers(void) { return 0; } | |
943 | void reiserfs_xattr_unregister_handlers(void) {} | |
944 | #endif | |
945 | ||
1da177e4 LT |
946 | /* This will catch lookups from the fs root to .reiserfs_priv */ |
947 | static int | |
bd4c625c | 948 | xattr_lookup_poison(struct dentry *dentry, struct qstr *q1, struct qstr *name) |
1da177e4 | 949 | { |
bd4c625c LT |
950 | struct dentry *priv_root = REISERFS_SB(dentry->d_sb)->priv_root; |
951 | if (name->len == priv_root->d_name.len && | |
952 | name->hash == priv_root->d_name.hash && | |
953 | !memcmp(name->name, priv_root->d_name.name, name->len)) { | |
954 | return -ENOENT; | |
955 | } else if (q1->len == name->len && | |
956 | !memcmp(q1->name, name->name, name->len)) | |
957 | return 0; | |
958 | return 1; | |
1da177e4 LT |
959 | } |
960 | ||
e16404ed | 961 | static const struct dentry_operations xattr_lookup_poison_ops = { |
bd4c625c | 962 | .d_compare = xattr_lookup_poison, |
1da177e4 LT |
963 | }; |
964 | ||
1da177e4 LT |
965 | /* We need to take a copy of the mount flags since things like |
966 | * MS_RDONLY don't get set until *after* we're called. | |
967 | * mount_flags != mount_options */ | |
bd4c625c | 968 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
1da177e4 | 969 | { |
bd4c625c LT |
970 | int err = 0; |
971 | ||
a72bdb1c JM |
972 | #ifdef CONFIG_REISERFS_FS_XATTR |
973 | err = xattr_mount_check(s); | |
974 | if (err) | |
bd4c625c | 975 | goto error; |
a72bdb1c | 976 | #endif |
bd4c625c LT |
977 | |
978 | /* If we don't have the privroot located yet - go find it */ | |
a72bdb1c | 979 | if (!REISERFS_SB(s)->priv_root) { |
bd4c625c LT |
980 | struct dentry *dentry; |
981 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, | |
982 | strlen(PRIVROOT_NAME)); | |
983 | if (!IS_ERR(dentry)) { | |
a72bdb1c JM |
984 | #ifdef CONFIG_REISERFS_FS_XATTR |
985 | if (!(mount_flags & MS_RDONLY) && !dentry->d_inode) | |
986 | err = create_privroot(dentry); | |
987 | #endif | |
988 | if (!dentry->d_inode) { | |
bd4c625c LT |
989 | dput(dentry); |
990 | dentry = NULL; | |
991 | } | |
992 | } else | |
993 | err = PTR_ERR(dentry); | |
994 | ||
995 | if (!err && dentry) { | |
996 | s->s_root->d_op = &xattr_lookup_poison_ops; | |
6dfede69 | 997 | dentry->d_inode->i_flags |= S_PRIVATE; |
bd4c625c | 998 | REISERFS_SB(s)->priv_root = dentry; |
a72bdb1c JM |
999 | #ifdef CONFIG_REISERFS_FS_XATTR |
1000 | /* xattrs are unavailable */ | |
1001 | } else if (!(mount_flags & MS_RDONLY)) { | |
1002 | /* If we're read-only it just means that the dir | |
1003 | * hasn't been created. Not an error -- just no | |
1004 | * xattrs on the fs. We'll check again if we | |
1005 | * go read-write */ | |
45b03d5e JM |
1006 | reiserfs_warning(s, "jdm-20006", |
1007 | "xattrs/ACLs enabled and couldn't " | |
1008 | "find/create .reiserfs_priv. " | |
1009 | "Failing mount."); | |
bd4c625c | 1010 | err = -EOPNOTSUPP; |
a72bdb1c | 1011 | #endif |
bd4c625c LT |
1012 | } |
1013 | } | |
1014 | ||
a72bdb1c | 1015 | #ifdef CONFIG_REISERFS_FS_XATTR |
48b32a35 JM |
1016 | if (!err) |
1017 | s->s_xattr = reiserfs_xattr_handlers; | |
1018 | ||
a72bdb1c | 1019 | error: |
bd4c625c | 1020 | if (err) { |
bd4c625c LT |
1021 | clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt)); |
1022 | clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt)); | |
1023 | } | |
a72bdb1c | 1024 | #endif |
bd4c625c LT |
1025 | |
1026 | /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */ | |
1027 | s->s_flags = s->s_flags & ~MS_POSIXACL; | |
a72bdb1c | 1028 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL |
bd4c625c LT |
1029 | if (reiserfs_posixacl(s)) |
1030 | s->s_flags |= MS_POSIXACL; | |
a72bdb1c | 1031 | #endif |
bd4c625c LT |
1032 | |
1033 | return err; | |
1da177e4 | 1034 | } |