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 | ||
123 | dentry = lookup_one_len(name, parent, strlen(name)); | |
124 | if (IS_ERR(dentry)) | |
125 | return dentry; | |
126 | else if (!dentry->d_inode) { | |
9b7f3755 | 127 | int err = -ENODATA; |
6c17675e JM |
128 | |
129 | if (xattr_may_create(flags)) { | |
130 | mutex_lock_nested(&parent->d_inode->i_mutex, | |
131 | I_MUTEX_XATTR); | |
132 | err = xattr_mkdir(parent->d_inode, dentry, 0700); | |
133 | mutex_unlock(&parent->d_inode->i_mutex); | |
134 | } | |
135 | ||
9b7f3755 | 136 | if (err) { |
6c17675e JM |
137 | dput(dentry); |
138 | dentry = ERR_PTR(err); | |
9b7f3755 | 139 | } |
bd4c625c | 140 | } |
bd4c625c | 141 | |
6c17675e JM |
142 | return dentry; |
143 | } | |
144 | ||
145 | static struct dentry *open_xa_root(struct super_block *sb, int flags) | |
146 | { | |
147 | struct dentry *privroot = REISERFS_SB(sb)->priv_root; | |
148 | if (!privroot) | |
149 | return ERR_PTR(-ENODATA); | |
150 | return lookup_or_create_dir(privroot, XAROOT_NAME, flags); | |
1da177e4 LT |
151 | } |
152 | ||
bd4c625c | 153 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
1da177e4 | 154 | { |
bd4c625c LT |
155 | struct dentry *xaroot, *xadir; |
156 | char namebuf[17]; | |
157 | ||
6c17675e | 158 | xaroot = open_xa_root(inode->i_sb, flags); |
9b7f3755 | 159 | if (IS_ERR(xaroot)) |
bd4c625c | 160 | return xaroot; |
bd4c625c | 161 | |
bd4c625c LT |
162 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
163 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), | |
164 | inode->i_generation); | |
bd4c625c | 165 | |
6c17675e | 166 | xadir = lookup_or_create_dir(xaroot, namebuf, flags); |
bd4c625c LT |
167 | dput(xaroot); |
168 | return xadir; | |
6c17675e | 169 | |
1da177e4 LT |
170 | } |
171 | ||
48b32a35 JM |
172 | /* The following are side effects of other operations that aren't explicitly |
173 | * modifying extended attributes. This includes operations such as permissions | |
174 | * or ownership changes, object deletions, etc. */ | |
a41f1a47 JM |
175 | struct reiserfs_dentry_buf { |
176 | struct dentry *xadir; | |
177 | int count; | |
178 | struct dentry *dentries[8]; | |
179 | }; | |
bd4c625c | 180 | |
a72bdb1c | 181 | static int |
a41f1a47 JM |
182 | fill_with_dentries(void *buf, const char *name, int namelen, loff_t offset, |
183 | u64 ino, unsigned int d_type) | |
a72bdb1c | 184 | { |
a41f1a47 | 185 | struct reiserfs_dentry_buf *dbuf = buf; |
a72bdb1c | 186 | struct dentry *dentry; |
bd4c625c | 187 | |
a41f1a47 JM |
188 | if (dbuf->count == ARRAY_SIZE(dbuf->dentries)) |
189 | return -ENOSPC; | |
bd4c625c | 190 | |
a41f1a47 JM |
191 | if (name[0] == '.' && (name[1] == '\0' || |
192 | (name[1] == '.' && name[2] == '\0'))) | |
193 | return 0; | |
bd4c625c | 194 | |
a41f1a47 | 195 | dentry = lookup_one_len(name, dbuf->xadir, namelen); |
a72bdb1c | 196 | if (IS_ERR(dentry)) { |
a41f1a47 | 197 | return PTR_ERR(dentry); |
a72bdb1c | 198 | } else if (!dentry->d_inode) { |
a41f1a47 JM |
199 | /* A directory entry exists, but no file? */ |
200 | reiserfs_error(dentry->d_sb, "xattr-20003", | |
201 | "Corrupted directory: xattr %s listed but " | |
202 | "not found for file %s.\n", | |
203 | dentry->d_name.name, dbuf->xadir->d_name.name); | |
204 | dput(dentry); | |
205 | return -EIO; | |
bd4c625c | 206 | } |
1da177e4 | 207 | |
a41f1a47 JM |
208 | dbuf->dentries[dbuf->count++] = dentry; |
209 | return 0; | |
1da177e4 LT |
210 | } |
211 | ||
a41f1a47 JM |
212 | static void |
213 | cleanup_dentry_buf(struct reiserfs_dentry_buf *buf) | |
1da177e4 | 214 | { |
a41f1a47 JM |
215 | int i; |
216 | for (i = 0; i < buf->count; i++) | |
217 | if (buf->dentries[i]) | |
218 | dput(buf->dentries[i]); | |
a72bdb1c JM |
219 | } |
220 | ||
a41f1a47 JM |
221 | static int reiserfs_for_each_xattr(struct inode *inode, |
222 | int (*action)(struct dentry *, void *), | |
223 | void *data) | |
a72bdb1c | 224 | { |
a41f1a47 JM |
225 | struct dentry *dir; |
226 | int i, err = 0; | |
227 | loff_t pos = 0; | |
228 | struct reiserfs_dentry_buf buf = { | |
229 | .count = 0, | |
230 | }; | |
1da177e4 | 231 | |
a72bdb1c JM |
232 | /* Skip out, an xattr has no xattrs associated with it */ |
233 | if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1) | |
234 | return 0; | |
1da177e4 | 235 | |
6c17675e | 236 | dir = open_xa_dir(inode, XATTR_REPLACE); |
a72bdb1c JM |
237 | if (IS_ERR(dir)) { |
238 | err = PTR_ERR(dir); | |
239 | goto out; | |
240 | } else if (!dir->d_inode) { | |
a41f1a47 JM |
241 | err = 0; |
242 | goto out_dir; | |
a72bdb1c | 243 | } |
1da177e4 | 244 | |
6c17675e | 245 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
a41f1a47 JM |
246 | buf.xadir = dir; |
247 | err = reiserfs_readdir_dentry(dir, &buf, fill_with_dentries, &pos); | |
248 | while ((err == 0 || err == -ENOSPC) && buf.count) { | |
249 | err = 0; | |
1da177e4 | 250 | |
a41f1a47 JM |
251 | for (i = 0; i < buf.count && buf.dentries[i]; i++) { |
252 | int lerr = 0; | |
253 | struct dentry *dentry = buf.dentries[i]; | |
1da177e4 | 254 | |
a41f1a47 JM |
255 | if (err == 0 && !S_ISDIR(dentry->d_inode->i_mode)) |
256 | lerr = action(dentry, data); | |
1da177e4 | 257 | |
a41f1a47 JM |
258 | dput(dentry); |
259 | buf.dentries[i] = NULL; | |
260 | err = lerr ?: err; | |
bd4c625c | 261 | } |
a41f1a47 JM |
262 | buf.count = 0; |
263 | if (!err) | |
264 | err = reiserfs_readdir_dentry(dir, &buf, | |
265 | fill_with_dentries, &pos); | |
8b6dd72a | 266 | } |
a41f1a47 | 267 | mutex_unlock(&dir->d_inode->i_mutex); |
1da177e4 | 268 | |
a41f1a47 JM |
269 | /* Clean up after a failed readdir */ |
270 | cleanup_dentry_buf(&buf); | |
1da177e4 | 271 | |
d984561b | 272 | if (!err) { |
a41f1a47 JM |
273 | /* We start a transaction here to avoid a ABBA situation |
274 | * between the xattr root's i_mutex and the journal lock. | |
275 | * This doesn't incur much additional overhead since the | |
276 | * new transaction will just nest inside the | |
277 | * outer transaction. */ | |
278 | int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + | |
279 | 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); | |
280 | struct reiserfs_transaction_handle th; | |
281 | err = journal_begin(&th, inode->i_sb, blocks); | |
282 | if (!err) { | |
283 | int jerror; | |
284 | mutex_lock_nested(&dir->d_parent->d_inode->i_mutex, | |
285 | I_MUTEX_XATTR); | |
286 | err = action(dir, data); | |
287 | jerror = journal_end(&th, inode->i_sb, blocks); | |
288 | mutex_unlock(&dir->d_parent->d_inode->i_mutex); | |
289 | err = jerror ?: err; | |
290 | } | |
a72bdb1c | 291 | } |
a41f1a47 JM |
292 | out_dir: |
293 | dput(dir); | |
a72bdb1c | 294 | out: |
a41f1a47 JM |
295 | /* -ENODATA isn't an error */ |
296 | if (err == -ENODATA) | |
297 | err = 0; | |
a72bdb1c JM |
298 | return err; |
299 | } | |
1da177e4 | 300 | |
a41f1a47 | 301 | static int delete_one_xattr(struct dentry *dentry, void *data) |
a72bdb1c | 302 | { |
a41f1a47 | 303 | struct inode *dir = dentry->d_parent->d_inode; |
1da177e4 | 304 | |
a41f1a47 JM |
305 | /* This is the xattr dir, handle specially. */ |
306 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
307 | return xattr_rmdir(dir, dentry); | |
1da177e4 | 308 | |
a41f1a47 JM |
309 | return xattr_unlink(dir, dentry); |
310 | } | |
bd4c625c | 311 | |
a41f1a47 JM |
312 | static int chown_one_xattr(struct dentry *dentry, void *data) |
313 | { | |
314 | struct iattr *attrs = data; | |
315 | return reiserfs_setattr(dentry, attrs); | |
316 | } | |
1da177e4 | 317 | |
a41f1a47 JM |
318 | /* No i_mutex, but the inode is unconnected. */ |
319 | int reiserfs_delete_xattrs(struct inode *inode) | |
320 | { | |
321 | int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); | |
322 | if (err) | |
323 | reiserfs_warning(inode->i_sb, "jdm-20004", | |
324 | "Couldn't delete all xattrs (%d)\n", err); | |
a72bdb1c JM |
325 | return err; |
326 | } | |
1da177e4 | 327 | |
a41f1a47 | 328 | /* inode->i_mutex: down */ |
a72bdb1c JM |
329 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
330 | { | |
a41f1a47 | 331 | int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); |
8b6dd72a JM |
332 | if (err) |
333 | reiserfs_warning(inode->i_sb, "jdm-20007", | |
334 | "Couldn't chown all xattrs (%d)\n", err); | |
a72bdb1c | 335 | return err; |
1da177e4 LT |
336 | } |
337 | ||
a72bdb1c | 338 | #ifdef CONFIG_REISERFS_FS_XATTR |
a72bdb1c JM |
339 | /* Returns a dentry corresponding to a specific extended attribute file |
340 | * for the inode. If flags allow, the file is created. Otherwise, a | |
341 | * valid or negative dentry, or an error is returned. */ | |
48b32a35 JM |
342 | static struct dentry *xattr_lookup(struct inode *inode, const char *name, |
343 | int flags) | |
1da177e4 | 344 | { |
a72bdb1c JM |
345 | struct dentry *xadir, *xafile; |
346 | int err = 0; | |
347 | ||
348 | xadir = open_xa_dir(inode, flags); | |
6c17675e | 349 | if (IS_ERR(xadir)) |
a72bdb1c | 350 | return ERR_CAST(xadir); |
a72bdb1c JM |
351 | |
352 | xafile = lookup_one_len(name, xadir, strlen(name)); | |
353 | if (IS_ERR(xafile)) { | |
6c17675e JM |
354 | err = PTR_ERR(xafile); |
355 | goto out; | |
bd4c625c | 356 | } |
a72bdb1c | 357 | |
6c17675e JM |
358 | if (xafile->d_inode && (flags & XATTR_CREATE)) |
359 | err = -EEXIST; | |
a72bdb1c | 360 | |
6c17675e JM |
361 | if (!xafile->d_inode) { |
362 | err = -ENODATA; | |
363 | if (xattr_may_create(flags)) { | |
364 | mutex_lock_nested(&xadir->d_inode->i_mutex, | |
365 | I_MUTEX_XATTR); | |
366 | err = xattr_create(xadir->d_inode, xafile, | |
367 | 0700|S_IFREG); | |
368 | mutex_unlock(&xadir->d_inode->i_mutex); | |
a72bdb1c JM |
369 | } |
370 | } | |
371 | ||
6c17675e JM |
372 | if (err) |
373 | dput(xafile); | |
a72bdb1c JM |
374 | out: |
375 | dput(xadir); | |
376 | if (err) | |
6c17675e | 377 | return ERR_PTR(err); |
a72bdb1c | 378 | return xafile; |
1da177e4 LT |
379 | } |
380 | ||
1da177e4 | 381 | /* Internal operations on file data */ |
bd4c625c | 382 | static inline void reiserfs_put_page(struct page *page) |
1da177e4 | 383 | { |
bd4c625c LT |
384 | kunmap(page); |
385 | page_cache_release(page); | |
1da177e4 LT |
386 | } |
387 | ||
ec6ea56b | 388 | static struct page *reiserfs_get_page(struct inode *dir, size_t n) |
1da177e4 | 389 | { |
bd4c625c LT |
390 | struct address_space *mapping = dir->i_mapping; |
391 | struct page *page; | |
392 | /* We can deadlock if we try to free dentries, | |
393 | and an unlink/rmdir has just occured - GFP_NOFS avoids this */ | |
c4cdd038 | 394 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
ec6ea56b | 395 | page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL); |
bd4c625c | 396 | if (!IS_ERR(page)) { |
bd4c625c | 397 | kmap(page); |
bd4c625c LT |
398 | if (PageError(page)) |
399 | goto fail; | |
400 | } | |
401 | return page; | |
402 | ||
403 | fail: | |
404 | reiserfs_put_page(page); | |
405 | return ERR_PTR(-EIO); | |
1da177e4 LT |
406 | } |
407 | ||
bd4c625c | 408 | static inline __u32 xattr_hash(const char *msg, int len) |
1da177e4 | 409 | { |
bd4c625c | 410 | return csum_partial(msg, len, 0); |
1da177e4 LT |
411 | } |
412 | ||
ba9d8cec VS |
413 | int reiserfs_commit_write(struct file *f, struct page *page, |
414 | unsigned from, unsigned to); | |
415 | int reiserfs_prepare_write(struct file *f, struct page *page, | |
416 | unsigned from, unsigned to); | |
417 | ||
48b32a35 JM |
418 | static void update_ctime(struct inode *inode) |
419 | { | |
420 | struct timespec now = current_fs_time(inode->i_sb); | |
421 | if (hlist_unhashed(&inode->i_hash) || !inode->i_nlink || | |
422 | timespec_equal(&inode->i_ctime, &now)) | |
423 | return; | |
424 | ||
425 | inode->i_ctime = CURRENT_TIME_SEC; | |
426 | mark_inode_dirty(inode); | |
427 | } | |
428 | ||
429 | static int lookup_and_delete_xattr(struct inode *inode, const char *name) | |
430 | { | |
431 | int err = 0; | |
432 | struct dentry *dentry, *xadir; | |
433 | ||
434 | xadir = open_xa_dir(inode, XATTR_REPLACE); | |
435 | if (IS_ERR(xadir)) | |
436 | return PTR_ERR(xadir); | |
437 | ||
438 | dentry = lookup_one_len(name, xadir, strlen(name)); | |
439 | if (IS_ERR(dentry)) { | |
440 | err = PTR_ERR(dentry); | |
441 | goto out_dput; | |
442 | } | |
443 | ||
444 | if (dentry->d_inode) { | |
445 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); | |
446 | err = xattr_unlink(xadir->d_inode, dentry); | |
447 | mutex_unlock(&xadir->d_inode->i_mutex); | |
448 | update_ctime(inode); | |
449 | } | |
450 | ||
451 | dput(dentry); | |
452 | out_dput: | |
453 | dput(xadir); | |
454 | return err; | |
455 | } | |
456 | ||
ba9d8cec | 457 | |
1da177e4 LT |
458 | /* Generic extended attribute operations that can be used by xa plugins */ |
459 | ||
460 | /* | |
1b1dcc1b | 461 | * inode->i_mutex: down |
1da177e4 LT |
462 | */ |
463 | int | |
0ab2621e JM |
464 | reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, |
465 | struct inode *inode, const char *name, | |
466 | const void *buffer, size_t buffer_size, int flags) | |
1da177e4 | 467 | { |
bd4c625c | 468 | int err = 0; |
3227e14c | 469 | struct dentry *dentry; |
bd4c625c LT |
470 | struct page *page; |
471 | char *data; | |
bd4c625c LT |
472 | size_t file_pos = 0; |
473 | size_t buffer_pos = 0; | |
48b32a35 | 474 | size_t new_size; |
bd4c625c LT |
475 | __u32 xahash = 0; |
476 | ||
bd4c625c LT |
477 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
478 | return -EOPNOTSUPP; | |
479 | ||
8b6dd72a | 480 | if (!buffer) |
48b32a35 | 481 | return lookup_and_delete_xattr(inode, name); |
bd4c625c | 482 | |
48b32a35 JM |
483 | dentry = xattr_lookup(inode, name, flags); |
484 | if (IS_ERR(dentry)) | |
485 | return PTR_ERR(dentry); | |
bd4c625c | 486 | |
8b6dd72a | 487 | down_write(&REISERFS_I(inode)->i_xattr_sem); |
bd4c625c | 488 | |
8b6dd72a | 489 | xahash = xattr_hash(buffer, buffer_size); |
bd4c625c LT |
490 | while (buffer_pos < buffer_size || buffer_pos == 0) { |
491 | size_t chunk; | |
492 | size_t skip = 0; | |
493 | size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1)); | |
494 | if (buffer_size - buffer_pos > PAGE_CACHE_SIZE) | |
495 | chunk = PAGE_CACHE_SIZE; | |
496 | else | |
497 | chunk = buffer_size - buffer_pos; | |
498 | ||
ec6ea56b | 499 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
500 | if (IS_ERR(page)) { |
501 | err = PTR_ERR(page); | |
48b32a35 | 502 | goto out_unlock; |
bd4c625c LT |
503 | } |
504 | ||
505 | lock_page(page); | |
506 | data = page_address(page); | |
507 | ||
508 | if (file_pos == 0) { | |
509 | struct reiserfs_xattr_header *rxh; | |
510 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
511 | if (chunk + skip > PAGE_CACHE_SIZE) | |
512 | chunk = PAGE_CACHE_SIZE - skip; | |
513 | rxh = (struct reiserfs_xattr_header *)data; | |
514 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); | |
515 | rxh->h_hash = cpu_to_le32(xahash); | |
516 | } | |
517 | ||
3227e14c | 518 | err = reiserfs_prepare_write(NULL, page, page_offset, |
ba9d8cec | 519 | page_offset + chunk + skip); |
bd4c625c LT |
520 | if (!err) { |
521 | if (buffer) | |
522 | memcpy(data + skip, buffer + buffer_pos, chunk); | |
3227e14c JM |
523 | err = reiserfs_commit_write(NULL, page, page_offset, |
524 | page_offset + chunk + | |
525 | skip); | |
bd4c625c LT |
526 | } |
527 | unlock_page(page); | |
528 | reiserfs_put_page(page); | |
529 | buffer_pos += chunk; | |
530 | file_pos += chunk; | |
531 | skip = 0; | |
532 | if (err || buffer_size == 0 || !buffer) | |
533 | break; | |
534 | } | |
535 | ||
48b32a35 JM |
536 | new_size = buffer_size + sizeof(struct reiserfs_xattr_header); |
537 | if (!err && new_size < i_size_read(dentry->d_inode)) { | |
538 | struct iattr newattrs = { | |
539 | .ia_ctime = current_fs_time(inode->i_sb), | |
540 | .ia_size = buffer_size, | |
541 | .ia_valid = ATTR_SIZE | ATTR_CTIME, | |
542 | }; | |
543 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR); | |
544 | down_write(&dentry->d_inode->i_alloc_sem); | |
545 | err = reiserfs_setattr(dentry, &newattrs); | |
546 | up_write(&dentry->d_inode->i_alloc_sem); | |
547 | mutex_unlock(&dentry->d_inode->i_mutex); | |
548 | } else | |
549 | update_ctime(inode); | |
550 | out_unlock: | |
8b6dd72a | 551 | up_write(&REISERFS_I(inode)->i_xattr_sem); |
3227e14c | 552 | dput(dentry); |
48b32a35 JM |
553 | return err; |
554 | } | |
bd4c625c | 555 | |
0ab2621e JM |
556 | /* We need to start a transaction to maintain lock ordering */ |
557 | int reiserfs_xattr_set(struct inode *inode, const char *name, | |
558 | const void *buffer, size_t buffer_size, int flags) | |
48b32a35 | 559 | { |
0ab2621e JM |
560 | |
561 | struct reiserfs_transaction_handle th; | |
562 | int error, error2; | |
563 | size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size); | |
564 | ||
565 | if (!(flags & XATTR_REPLACE)) | |
566 | jbegin_count += reiserfs_xattr_jcreate_nblocks(inode); | |
567 | ||
568 | reiserfs_write_lock(inode->i_sb); | |
569 | error = journal_begin(&th, inode->i_sb, jbegin_count); | |
570 | if (error) { | |
571 | reiserfs_write_unlock(inode->i_sb); | |
572 | return error; | |
1da177e4 | 573 | } |
bd4c625c | 574 | |
0ab2621e JM |
575 | error = reiserfs_xattr_set_handle(&th, inode, name, |
576 | buffer, buffer_size, flags); | |
bd4c625c | 577 | |
0ab2621e JM |
578 | error2 = journal_end(&th, inode->i_sb, jbegin_count); |
579 | if (error == 0) | |
580 | error = error2; | |
581 | reiserfs_write_unlock(inode->i_sb); | |
582 | ||
583 | return error; | |
1da177e4 LT |
584 | } |
585 | ||
586 | /* | |
1b1dcc1b | 587 | * inode->i_mutex: down |
1da177e4 LT |
588 | */ |
589 | int | |
48b32a35 | 590 | reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, |
bd4c625c | 591 | size_t buffer_size) |
1da177e4 | 592 | { |
bd4c625c | 593 | ssize_t err = 0; |
3227e14c | 594 | struct dentry *dentry; |
bd4c625c LT |
595 | size_t isize; |
596 | size_t file_pos = 0; | |
597 | size_t buffer_pos = 0; | |
598 | struct page *page; | |
bd4c625c LT |
599 | __u32 hash = 0; |
600 | ||
601 | if (name == NULL) | |
602 | return -EINVAL; | |
603 | ||
604 | /* We can't have xattrs attached to v1 items since they don't have | |
605 | * generation numbers */ | |
606 | if (get_inode_sd_version(inode) == STAT_DATA_V1) | |
607 | return -EOPNOTSUPP; | |
608 | ||
48b32a35 | 609 | dentry = xattr_lookup(inode, name, XATTR_REPLACE); |
3227e14c JM |
610 | if (IS_ERR(dentry)) { |
611 | err = PTR_ERR(dentry); | |
bd4c625c LT |
612 | goto out; |
613 | } | |
614 | ||
8b6dd72a | 615 | down_read(&REISERFS_I(inode)->i_xattr_sem); |
d984561b | 616 | |
f437c529 | 617 | isize = i_size_read(dentry->d_inode); |
bd4c625c LT |
618 | |
619 | /* Just return the size needed */ | |
620 | if (buffer == NULL) { | |
621 | err = isize - sizeof(struct reiserfs_xattr_header); | |
8b6dd72a | 622 | goto out_unlock; |
bd4c625c LT |
623 | } |
624 | ||
625 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { | |
626 | err = -ERANGE; | |
8b6dd72a | 627 | goto out_unlock; |
bd4c625c LT |
628 | } |
629 | ||
630 | while (file_pos < isize) { | |
631 | size_t chunk; | |
632 | char *data; | |
633 | size_t skip = 0; | |
634 | if (isize - file_pos > PAGE_CACHE_SIZE) | |
635 | chunk = PAGE_CACHE_SIZE; | |
636 | else | |
637 | chunk = isize - file_pos; | |
638 | ||
a72bdb1c | 639 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
640 | if (IS_ERR(page)) { |
641 | err = PTR_ERR(page); | |
8b6dd72a | 642 | goto out_unlock; |
bd4c625c LT |
643 | } |
644 | ||
645 | lock_page(page); | |
646 | data = page_address(page); | |
647 | if (file_pos == 0) { | |
648 | struct reiserfs_xattr_header *rxh = | |
649 | (struct reiserfs_xattr_header *)data; | |
650 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
651 | chunk -= skip; | |
652 | /* Magic doesn't match up.. */ | |
653 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { | |
654 | unlock_page(page); | |
655 | reiserfs_put_page(page); | |
a72bdb1c | 656 | reiserfs_warning(inode->i_sb, "jdm-20001", |
bd4c625c LT |
657 | "Invalid magic for xattr (%s) " |
658 | "associated with %k", name, | |
659 | INODE_PKEY(inode)); | |
660 | err = -EIO; | |
8b6dd72a | 661 | goto out_unlock; |
bd4c625c LT |
662 | } |
663 | hash = le32_to_cpu(rxh->h_hash); | |
664 | } | |
665 | memcpy(buffer + buffer_pos, data + skip, chunk); | |
666 | unlock_page(page); | |
667 | reiserfs_put_page(page); | |
668 | file_pos += chunk; | |
669 | buffer_pos += chunk; | |
670 | skip = 0; | |
671 | } | |
672 | err = isize - sizeof(struct reiserfs_xattr_header); | |
673 | ||
674 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != | |
675 | hash) { | |
a72bdb1c | 676 | reiserfs_warning(inode->i_sb, "jdm-20002", |
bd4c625c LT |
677 | "Invalid hash for xattr (%s) associated " |
678 | "with %k", name, INODE_PKEY(inode)); | |
679 | err = -EIO; | |
680 | } | |
681 | ||
8b6dd72a JM |
682 | out_unlock: |
683 | up_read(&REISERFS_I(inode)->i_xattr_sem); | |
3227e14c | 684 | dput(dentry); |
bd4c625c | 685 | |
a72bdb1c | 686 | out: |
bd4c625c | 687 | return err; |
1da177e4 LT |
688 | } |
689 | ||
48b32a35 JM |
690 | /* Actual operations that are exported to VFS-land */ |
691 | struct xattr_handler *reiserfs_xattr_handlers[] = { | |
692 | &reiserfs_xattr_user_handler, | |
693 | &reiserfs_xattr_trusted_handler, | |
694 | #ifdef CONFIG_REISERFS_FS_SECURITY | |
695 | &reiserfs_xattr_security_handler, | |
696 | #endif | |
697 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL | |
698 | &reiserfs_posix_acl_access_handler, | |
699 | &reiserfs_posix_acl_default_handler, | |
700 | #endif | |
701 | NULL | |
1da177e4 LT |
702 | }; |
703 | ||
48b32a35 JM |
704 | /* |
705 | * In order to implement different sets of xattr operations for each xattr | |
706 | * prefix with the generic xattr API, a filesystem should create a | |
707 | * null-terminated array of struct xattr_handler (one for each prefix) and | |
708 | * hang a pointer to it off of the s_xattr field of the superblock. | |
709 | * | |
710 | * The generic_fooxattr() functions will use this list to dispatch xattr | |
711 | * operations to the correct xattr_handler. | |
712 | */ | |
713 | #define for_each_xattr_handler(handlers, handler) \ | |
714 | for ((handler) = *(handlers)++; \ | |
715 | (handler) != NULL; \ | |
716 | (handler) = *(handlers)++) | |
1da177e4 | 717 | |
48b32a35 JM |
718 | /* This is the implementation for the xattr plugin infrastructure */ |
719 | static inline struct xattr_handler * | |
720 | find_xattr_handler_prefix(struct xattr_handler **handlers, | |
721 | const char *name) | |
1da177e4 | 722 | { |
48b32a35 | 723 | struct xattr_handler *xah; |
bd4c625c | 724 | |
48b32a35 JM |
725 | if (!handlers) |
726 | return NULL; | |
bd4c625c | 727 | |
48b32a35 JM |
728 | for_each_xattr_handler(handlers, xah) { |
729 | if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0) | |
730 | break; | |
bd4c625c LT |
731 | } |
732 | ||
48b32a35 | 733 | return xah; |
bd4c625c | 734 | } |
1da177e4 | 735 | |
1da177e4 LT |
736 | |
737 | /* | |
738 | * Inode operation getxattr() | |
1da177e4 LT |
739 | */ |
740 | ssize_t | |
bd4c625c LT |
741 | reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, |
742 | size_t size) | |
1da177e4 | 743 | { |
48b32a35 JM |
744 | struct inode *inode = dentry->d_inode; |
745 | struct xattr_handler *handler; | |
bd4c625c | 746 | |
48b32a35 JM |
747 | handler = find_xattr_handler_prefix(inode->i_sb->s_xattr, name); |
748 | ||
749 | if (!handler || get_inode_sd_version(inode) == STAT_DATA_V1) | |
bd4c625c LT |
750 | return -EOPNOTSUPP; |
751 | ||
48b32a35 | 752 | return handler->get(inode, name, buffer, size); |
1da177e4 LT |
753 | } |
754 | ||
1da177e4 LT |
755 | /* |
756 | * Inode operation setxattr() | |
757 | * | |
1b1dcc1b | 758 | * dentry->d_inode->i_mutex down |
1da177e4 LT |
759 | */ |
760 | int | |
bd4c625c LT |
761 | reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
762 | size_t size, int flags) | |
1da177e4 | 763 | { |
48b32a35 JM |
764 | struct inode *inode = dentry->d_inode; |
765 | struct xattr_handler *handler; | |
bd4c625c | 766 | |
48b32a35 JM |
767 | handler = find_xattr_handler_prefix(inode->i_sb->s_xattr, name); |
768 | ||
769 | if (!handler || get_inode_sd_version(inode) == STAT_DATA_V1) | |
bd4c625c LT |
770 | return -EOPNOTSUPP; |
771 | ||
48b32a35 | 772 | return handler->set(inode, name, value, size, flags); |
1da177e4 LT |
773 | } |
774 | ||
775 | /* | |
776 | * Inode operation removexattr() | |
777 | * | |
1b1dcc1b | 778 | * dentry->d_inode->i_mutex down |
1da177e4 | 779 | */ |
bd4c625c | 780 | int reiserfs_removexattr(struct dentry *dentry, const char *name) |
1da177e4 | 781 | { |
48b32a35 JM |
782 | struct inode *inode = dentry->d_inode; |
783 | struct xattr_handler *handler; | |
784 | handler = find_xattr_handler_prefix(inode->i_sb->s_xattr, name); | |
1da177e4 | 785 | |
48b32a35 | 786 | if (!handler || get_inode_sd_version(inode) == STAT_DATA_V1) |
bd4c625c | 787 | return -EOPNOTSUPP; |
1da177e4 | 788 | |
48b32a35 | 789 | return handler->set(inode, name, NULL, 0, XATTR_REPLACE); |
1da177e4 LT |
790 | } |
791 | ||
48b32a35 JM |
792 | struct listxattr_buf { |
793 | size_t size; | |
794 | size_t pos; | |
795 | char *buf; | |
796 | struct inode *inode; | |
1da177e4 LT |
797 | }; |
798 | ||
48b32a35 JM |
799 | static int listxattr_filler(void *buf, const char *name, int namelen, |
800 | loff_t offset, u64 ino, unsigned int d_type) | |
1da177e4 | 801 | { |
48b32a35 JM |
802 | struct listxattr_buf *b = (struct listxattr_buf *)buf; |
803 | size_t size; | |
804 | if (name[0] != '.' || | |
805 | (namelen != 1 && (name[1] != '.' || namelen != 2))) { | |
806 | struct xattr_handler *handler; | |
807 | handler = find_xattr_handler_prefix(b->inode->i_sb->s_xattr, | |
808 | name); | |
809 | if (!handler) /* Unsupported xattr name */ | |
810 | return 0; | |
811 | if (b->buf) { | |
812 | size = handler->list(b->inode, b->buf + b->pos, | |
813 | b->size, name, namelen); | |
814 | if (size > b->size) | |
815 | return -ERANGE; | |
816 | } else { | |
817 | size = handler->list(b->inode, NULL, 0, name, namelen); | |
bd4c625c | 818 | } |
bd4c625c | 819 | |
48b32a35 JM |
820 | b->pos += size; |
821 | } | |
bd4c625c | 822 | return 0; |
1da177e4 | 823 | } |
bd4c625c | 824 | |
1da177e4 LT |
825 | /* |
826 | * Inode operation listxattr() | |
827 | * | |
48b32a35 JM |
828 | * We totally ignore the generic listxattr here because it would be stupid |
829 | * not to. Since the xattrs are organized in a directory, we can just | |
830 | * readdir to find them. | |
1da177e4 | 831 | */ |
bd4c625c | 832 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
1da177e4 | 833 | { |
bd4c625c LT |
834 | struct dentry *dir; |
835 | int err = 0; | |
a41f1a47 | 836 | loff_t pos = 0; |
48b32a35 JM |
837 | struct listxattr_buf buf = { |
838 | .inode = dentry->d_inode, | |
839 | .buf = buffer, | |
840 | .size = buffer ? size : 0, | |
841 | }; | |
bd4c625c LT |
842 | |
843 | if (!dentry->d_inode) | |
844 | return -EINVAL; | |
845 | ||
846 | if (!reiserfs_xattrs(dentry->d_sb) || | |
847 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) | |
848 | return -EOPNOTSUPP; | |
849 | ||
6c17675e | 850 | dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE); |
bd4c625c LT |
851 | if (IS_ERR(dir)) { |
852 | err = PTR_ERR(dir); | |
853 | if (err == -ENODATA) | |
48b32a35 | 854 | err = 0; /* Not an error if there aren't any xattrs */ |
bd4c625c LT |
855 | goto out; |
856 | } | |
857 | ||
6c17675e | 858 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
a41f1a47 | 859 | err = reiserfs_readdir_dentry(dir, &buf, listxattr_filler, &pos); |
6c17675e | 860 | mutex_unlock(&dir->d_inode->i_mutex); |
bd4c625c | 861 | |
48b32a35 JM |
862 | if (!err) |
863 | err = buf.pos; | |
bd4c625c | 864 | |
3227e14c | 865 | dput(dir); |
8b6dd72a | 866 | out: |
bd4c625c | 867 | return err; |
1da177e4 LT |
868 | } |
869 | ||
a72bdb1c | 870 | static int reiserfs_check_acl(struct inode *inode, int mask) |
1da177e4 | 871 | { |
a72bdb1c JM |
872 | struct posix_acl *acl; |
873 | int error = -EAGAIN; /* do regular unix permission checks by default */ | |
bd4c625c | 874 | |
a72bdb1c JM |
875 | acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS); |
876 | ||
a72bdb1c JM |
877 | if (acl) { |
878 | if (!IS_ERR(acl)) { | |
879 | error = posix_acl_permission(inode, acl, mask); | |
880 | posix_acl_release(acl); | |
881 | } else if (PTR_ERR(acl) != -ENODATA) | |
882 | error = PTR_ERR(acl); | |
bd4c625c LT |
883 | } |
884 | ||
a72bdb1c | 885 | return error; |
1da177e4 LT |
886 | } |
887 | ||
a72bdb1c | 888 | int reiserfs_permission(struct inode *inode, int mask) |
1da177e4 | 889 | { |
a72bdb1c JM |
890 | /* |
891 | * We don't do permission checks on the internal objects. | |
892 | * Permissions are determined by the "owning" object. | |
893 | */ | |
894 | if (IS_PRIVATE(inode)) | |
895 | return 0; | |
896 | /* | |
897 | * Stat data v1 doesn't support ACLs. | |
898 | */ | |
899 | if (get_inode_sd_version(inode) == STAT_DATA_V1) | |
900 | return generic_permission(inode, mask, NULL); | |
901 | else | |
902 | return generic_permission(inode, mask, reiserfs_check_acl); | |
1da177e4 LT |
903 | } |
904 | ||
a72bdb1c | 905 | static int create_privroot(struct dentry *dentry) |
1da177e4 | 906 | { |
a72bdb1c JM |
907 | int err; |
908 | struct inode *inode = dentry->d_parent->d_inode; | |
909 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_XATTR); | |
6c17675e | 910 | err = xattr_mkdir(inode, dentry, 0700); |
a72bdb1c JM |
911 | mutex_unlock(&inode->i_mutex); |
912 | if (err) { | |
913 | dput(dentry); | |
914 | dentry = NULL; | |
bd4c625c LT |
915 | } |
916 | ||
a72bdb1c JM |
917 | if (dentry && dentry->d_inode) |
918 | reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr " | |
919 | "storage.\n", PRIVROOT_NAME); | |
bd4c625c | 920 | |
bd4c625c | 921 | return err; |
1da177e4 LT |
922 | } |
923 | ||
a72bdb1c | 924 | static int xattr_mount_check(struct super_block *s) |
1da177e4 | 925 | { |
a72bdb1c JM |
926 | /* We need generation numbers to ensure that the oid mapping is correct |
927 | * v3.5 filesystems don't have them. */ | |
48b32a35 JM |
928 | if (old_format_only(s)) { |
929 | if (reiserfs_xattrs_optional(s)) { | |
930 | /* Old format filesystem, but optional xattrs have | |
931 | * been enabled. Error out. */ | |
932 | reiserfs_warning(s, "jdm-2005", | |
933 | "xattrs/ACLs not supported " | |
934 | "on pre-v3.6 format filesystems. " | |
935 | "Failing mount."); | |
936 | return -EOPNOTSUPP; | |
937 | } | |
a72bdb1c JM |
938 | } |
939 | ||
940 | return 0; | |
1da177e4 LT |
941 | } |
942 | ||
a72bdb1c JM |
943 | #else |
944 | int __init reiserfs_xattr_register_handlers(void) { return 0; } | |
945 | void reiserfs_xattr_unregister_handlers(void) {} | |
946 | #endif | |
947 | ||
1da177e4 LT |
948 | /* This will catch lookups from the fs root to .reiserfs_priv */ |
949 | static int | |
bd4c625c | 950 | xattr_lookup_poison(struct dentry *dentry, struct qstr *q1, struct qstr *name) |
1da177e4 | 951 | { |
bd4c625c LT |
952 | struct dentry *priv_root = REISERFS_SB(dentry->d_sb)->priv_root; |
953 | if (name->len == priv_root->d_name.len && | |
954 | name->hash == priv_root->d_name.hash && | |
955 | !memcmp(name->name, priv_root->d_name.name, name->len)) { | |
956 | return -ENOENT; | |
957 | } else if (q1->len == name->len && | |
958 | !memcmp(q1->name, name->name, name->len)) | |
959 | return 0; | |
960 | return 1; | |
1da177e4 LT |
961 | } |
962 | ||
e16404ed | 963 | static const struct dentry_operations xattr_lookup_poison_ops = { |
bd4c625c | 964 | .d_compare = xattr_lookup_poison, |
1da177e4 LT |
965 | }; |
966 | ||
1da177e4 LT |
967 | /* We need to take a copy of the mount flags since things like |
968 | * MS_RDONLY don't get set until *after* we're called. | |
969 | * mount_flags != mount_options */ | |
bd4c625c | 970 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
1da177e4 | 971 | { |
bd4c625c LT |
972 | int err = 0; |
973 | ||
a72bdb1c JM |
974 | #ifdef CONFIG_REISERFS_FS_XATTR |
975 | err = xattr_mount_check(s); | |
976 | if (err) | |
bd4c625c | 977 | goto error; |
a72bdb1c | 978 | #endif |
bd4c625c LT |
979 | |
980 | /* If we don't have the privroot located yet - go find it */ | |
a72bdb1c | 981 | if (!REISERFS_SB(s)->priv_root) { |
bd4c625c LT |
982 | struct dentry *dentry; |
983 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, | |
984 | strlen(PRIVROOT_NAME)); | |
985 | if (!IS_ERR(dentry)) { | |
a72bdb1c JM |
986 | #ifdef CONFIG_REISERFS_FS_XATTR |
987 | if (!(mount_flags & MS_RDONLY) && !dentry->d_inode) | |
988 | err = create_privroot(dentry); | |
989 | #endif | |
990 | if (!dentry->d_inode) { | |
bd4c625c LT |
991 | dput(dentry); |
992 | dentry = NULL; | |
993 | } | |
994 | } else | |
995 | err = PTR_ERR(dentry); | |
996 | ||
997 | if (!err && dentry) { | |
998 | s->s_root->d_op = &xattr_lookup_poison_ops; | |
6dfede69 | 999 | dentry->d_inode->i_flags |= S_PRIVATE; |
bd4c625c | 1000 | REISERFS_SB(s)->priv_root = dentry; |
a72bdb1c JM |
1001 | #ifdef CONFIG_REISERFS_FS_XATTR |
1002 | /* xattrs are unavailable */ | |
1003 | } else if (!(mount_flags & MS_RDONLY)) { | |
1004 | /* If we're read-only it just means that the dir | |
1005 | * hasn't been created. Not an error -- just no | |
1006 | * xattrs on the fs. We'll check again if we | |
1007 | * go read-write */ | |
45b03d5e JM |
1008 | reiserfs_warning(s, "jdm-20006", |
1009 | "xattrs/ACLs enabled and couldn't " | |
1010 | "find/create .reiserfs_priv. " | |
1011 | "Failing mount."); | |
bd4c625c | 1012 | err = -EOPNOTSUPP; |
a72bdb1c | 1013 | #endif |
bd4c625c LT |
1014 | } |
1015 | } | |
1016 | ||
a72bdb1c | 1017 | #ifdef CONFIG_REISERFS_FS_XATTR |
48b32a35 JM |
1018 | if (!err) |
1019 | s->s_xattr = reiserfs_xattr_handlers; | |
1020 | ||
a72bdb1c | 1021 | error: |
bd4c625c | 1022 | if (err) { |
bd4c625c LT |
1023 | clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt)); |
1024 | clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt)); | |
1025 | } | |
a72bdb1c | 1026 | #endif |
bd4c625c LT |
1027 | |
1028 | /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */ | |
1029 | s->s_flags = s->s_flags & ~MS_POSIXACL; | |
a72bdb1c | 1030 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL |
bd4c625c LT |
1031 | if (reiserfs_posixacl(s)) |
1032 | s->s_flags |= MS_POSIXACL; | |
a72bdb1c | 1033 | #endif |
bd4c625c LT |
1034 | |
1035 | return err; | |
1da177e4 | 1036 | } |