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 | 49 | #include <linux/stat.h> |
6c17675e | 50 | #include <linux/quotaops.h> |
1da177e4 | 51 | |
1da177e4 LT |
52 | #define PRIVROOT_NAME ".reiserfs_priv" |
53 | #define XAROOT_NAME "xattrs" | |
54 | ||
1da177e4 | 55 | |
6c17675e JM |
56 | /* Helpers for inode ops. We do this so that we don't have all the VFS |
57 | * overhead and also for proper i_mutex annotation. | |
58 | * dir->i_mutex must be held for all of them. */ | |
3a355cc6 | 59 | #ifdef CONFIG_REISERFS_FS_XATTR |
6c17675e | 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 | } | |
3a355cc6 | 66 | #endif |
bd4c625c | 67 | |
6c17675e JM |
68 | static int xattr_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
69 | { | |
70 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); | |
e1c50248 | 71 | vfs_dq_init(dir); |
6c17675e JM |
72 | return dir->i_op->mkdir(dir, dentry, mode); |
73 | } | |
bd4c625c | 74 | |
6c17675e JM |
75 | /* We use I_MUTEX_CHILD here to silence lockdep. It's safe because xattr |
76 | * mutation ops aren't called during rename or splace, which are the | |
77 | * only other users of I_MUTEX_CHILD. It violates the ordering, but that's | |
78 | * better than allocating another subclass just for this code. */ | |
79 | static int xattr_unlink(struct inode *dir, struct dentry *dentry) | |
80 | { | |
81 | int error; | |
82 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); | |
e1c50248 | 83 | vfs_dq_init(dir); |
bd4c625c | 84 | |
6c17675e JM |
85 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD); |
86 | error = dir->i_op->unlink(dir, dentry); | |
87 | mutex_unlock(&dentry->d_inode->i_mutex); | |
88 | ||
89 | if (!error) | |
90 | d_delete(dentry); | |
91 | return error; | |
92 | } | |
93 | ||
94 | static int xattr_rmdir(struct inode *dir, struct dentry *dentry) | |
95 | { | |
96 | int error; | |
97 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); | |
e1c50248 | 98 | vfs_dq_init(dir); |
6c17675e JM |
99 | |
100 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD); | |
101 | dentry_unhash(dentry); | |
102 | error = dir->i_op->rmdir(dir, dentry); | |
103 | if (!error) | |
104 | dentry->d_inode->i_flags |= S_DEAD; | |
105 | mutex_unlock(&dentry->d_inode->i_mutex); | |
106 | if (!error) | |
107 | d_delete(dentry); | |
108 | dput(dentry); | |
109 | ||
110 | return error; | |
111 | } | |
112 | ||
6c17675e JM |
113 | #define xattr_may_create(flags) (!flags || flags & XATTR_CREATE) |
114 | ||
ab17c4f0 | 115 | static struct dentry *open_xa_root(struct super_block *sb, int flags) |
6c17675e | 116 | { |
ab17c4f0 JM |
117 | struct dentry *privroot = REISERFS_SB(sb)->priv_root; |
118 | struct dentry *xaroot; | |
119 | if (!privroot->d_inode) | |
120 | return ERR_PTR(-ENODATA); | |
6c17675e | 121 | |
ab17c4f0 | 122 | mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR); |
6c17675e | 123 | |
ab17c4f0 | 124 | xaroot = dget(REISERFS_SB(sb)->xattr_root); |
ceb5edc4 JM |
125 | if (!xaroot) |
126 | xaroot = ERR_PTR(-ENODATA); | |
127 | else if (!xaroot->d_inode) { | |
ab17c4f0 | 128 | int err = -ENODATA; |
5a6059c3 | 129 | if (xattr_may_create(flags)) |
ab17c4f0 | 130 | err = xattr_mkdir(privroot->d_inode, xaroot, 0700); |
9b7f3755 | 131 | if (err) { |
ab17c4f0 JM |
132 | dput(xaroot); |
133 | xaroot = ERR_PTR(err); | |
9b7f3755 | 134 | } |
bd4c625c | 135 | } |
6c17675e | 136 | |
ab17c4f0 JM |
137 | mutex_unlock(&privroot->d_inode->i_mutex); |
138 | return xaroot; | |
1da177e4 LT |
139 | } |
140 | ||
bd4c625c | 141 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
1da177e4 | 142 | { |
bd4c625c LT |
143 | struct dentry *xaroot, *xadir; |
144 | char namebuf[17]; | |
145 | ||
6c17675e | 146 | xaroot = open_xa_root(inode->i_sb, flags); |
9b7f3755 | 147 | if (IS_ERR(xaroot)) |
bd4c625c | 148 | return xaroot; |
bd4c625c | 149 | |
bd4c625c LT |
150 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
151 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), | |
152 | inode->i_generation); | |
bd4c625c | 153 | |
ab17c4f0 JM |
154 | mutex_lock_nested(&xaroot->d_inode->i_mutex, I_MUTEX_XATTR); |
155 | ||
156 | xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf)); | |
157 | if (!IS_ERR(xadir) && !xadir->d_inode) { | |
158 | int err = -ENODATA; | |
159 | if (xattr_may_create(flags)) | |
160 | err = xattr_mkdir(xaroot->d_inode, xadir, 0700); | |
161 | if (err) { | |
162 | dput(xadir); | |
163 | xadir = ERR_PTR(err); | |
164 | } | |
165 | } | |
166 | ||
167 | mutex_unlock(&xaroot->d_inode->i_mutex); | |
bd4c625c LT |
168 | dput(xaroot); |
169 | return xadir; | |
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; |
5a6059c3 | 187 | WARN_ON_ONCE(!mutex_is_locked(&dbuf->xadir->d_inode->i_mutex)); |
bd4c625c | 188 | |
a41f1a47 JM |
189 | if (dbuf->count == ARRAY_SIZE(dbuf->dentries)) |
190 | return -ENOSPC; | |
bd4c625c | 191 | |
a41f1a47 JM |
192 | if (name[0] == '.' && (name[1] == '\0' || |
193 | (name[1] == '.' && name[2] == '\0'))) | |
194 | return 0; | |
bd4c625c | 195 | |
a41f1a47 | 196 | dentry = lookup_one_len(name, dbuf->xadir, namelen); |
a72bdb1c | 197 | if (IS_ERR(dentry)) { |
a41f1a47 | 198 | return PTR_ERR(dentry); |
a72bdb1c | 199 | } else if (!dentry->d_inode) { |
a41f1a47 JM |
200 | /* A directory entry exists, but no file? */ |
201 | reiserfs_error(dentry->d_sb, "xattr-20003", | |
202 | "Corrupted directory: xattr %s listed but " | |
203 | "not found for file %s.\n", | |
204 | dentry->d_name.name, dbuf->xadir->d_name.name); | |
205 | dput(dentry); | |
206 | return -EIO; | |
bd4c625c | 207 | } |
1da177e4 | 208 | |
a41f1a47 JM |
209 | dbuf->dentries[dbuf->count++] = dentry; |
210 | return 0; | |
1da177e4 LT |
211 | } |
212 | ||
a41f1a47 JM |
213 | static void |
214 | cleanup_dentry_buf(struct reiserfs_dentry_buf *buf) | |
1da177e4 | 215 | { |
a41f1a47 JM |
216 | int i; |
217 | for (i = 0; i < buf->count; i++) | |
218 | if (buf->dentries[i]) | |
219 | dput(buf->dentries[i]); | |
a72bdb1c JM |
220 | } |
221 | ||
a41f1a47 JM |
222 | static int reiserfs_for_each_xattr(struct inode *inode, |
223 | int (*action)(struct dentry *, void *), | |
224 | void *data) | |
a72bdb1c | 225 | { |
a41f1a47 JM |
226 | struct dentry *dir; |
227 | int i, err = 0; | |
228 | loff_t pos = 0; | |
229 | struct reiserfs_dentry_buf buf = { | |
230 | .count = 0, | |
231 | }; | |
1da177e4 | 232 | |
a72bdb1c JM |
233 | /* Skip out, an xattr has no xattrs associated with it */ |
234 | if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1) | |
235 | return 0; | |
1da177e4 | 236 | |
27026a05 | 237 | reiserfs_write_unlock(inode->i_sb); |
6c17675e | 238 | dir = open_xa_dir(inode, XATTR_REPLACE); |
a72bdb1c JM |
239 | if (IS_ERR(dir)) { |
240 | err = PTR_ERR(dir); | |
27026a05 | 241 | reiserfs_write_lock(inode->i_sb); |
a72bdb1c JM |
242 | goto out; |
243 | } else if (!dir->d_inode) { | |
a41f1a47 | 244 | err = 0; |
27026a05 | 245 | reiserfs_write_lock(inode->i_sb); |
a41f1a47 | 246 | goto out_dir; |
a72bdb1c | 247 | } |
1da177e4 | 248 | |
27026a05 FW |
249 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
250 | ||
251 | reiserfs_write_lock(inode->i_sb); | |
252 | ||
a41f1a47 JM |
253 | buf.xadir = dir; |
254 | err = reiserfs_readdir_dentry(dir, &buf, fill_with_dentries, &pos); | |
255 | while ((err == 0 || err == -ENOSPC) && buf.count) { | |
256 | err = 0; | |
1da177e4 | 257 | |
a41f1a47 JM |
258 | for (i = 0; i < buf.count && buf.dentries[i]; i++) { |
259 | int lerr = 0; | |
260 | struct dentry *dentry = buf.dentries[i]; | |
1da177e4 | 261 | |
a41f1a47 JM |
262 | if (err == 0 && !S_ISDIR(dentry->d_inode->i_mode)) |
263 | lerr = action(dentry, data); | |
1da177e4 | 264 | |
a41f1a47 JM |
265 | dput(dentry); |
266 | buf.dentries[i] = NULL; | |
267 | err = lerr ?: err; | |
bd4c625c | 268 | } |
a41f1a47 JM |
269 | buf.count = 0; |
270 | if (!err) | |
271 | err = reiserfs_readdir_dentry(dir, &buf, | |
272 | fill_with_dentries, &pos); | |
8b6dd72a | 273 | } |
a41f1a47 | 274 | mutex_unlock(&dir->d_inode->i_mutex); |
1da177e4 | 275 | |
a41f1a47 JM |
276 | /* Clean up after a failed readdir */ |
277 | cleanup_dentry_buf(&buf); | |
1da177e4 | 278 | |
d984561b | 279 | if (!err) { |
a41f1a47 JM |
280 | /* We start a transaction here to avoid a ABBA situation |
281 | * between the xattr root's i_mutex and the journal lock. | |
282 | * This doesn't incur much additional overhead since the | |
283 | * new transaction will just nest inside the | |
284 | * outer transaction. */ | |
285 | int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + | |
286 | 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); | |
287 | struct reiserfs_transaction_handle th; | |
288 | err = journal_begin(&th, inode->i_sb, blocks); | |
289 | if (!err) { | |
290 | int jerror; | |
291 | mutex_lock_nested(&dir->d_parent->d_inode->i_mutex, | |
292 | I_MUTEX_XATTR); | |
293 | err = action(dir, data); | |
294 | jerror = journal_end(&th, inode->i_sb, blocks); | |
295 | mutex_unlock(&dir->d_parent->d_inode->i_mutex); | |
296 | err = jerror ?: err; | |
297 | } | |
a72bdb1c | 298 | } |
a41f1a47 JM |
299 | out_dir: |
300 | dput(dir); | |
a72bdb1c | 301 | out: |
a41f1a47 JM |
302 | /* -ENODATA isn't an error */ |
303 | if (err == -ENODATA) | |
304 | err = 0; | |
a72bdb1c JM |
305 | return err; |
306 | } | |
1da177e4 | 307 | |
a41f1a47 | 308 | static int delete_one_xattr(struct dentry *dentry, void *data) |
a72bdb1c | 309 | { |
a41f1a47 | 310 | struct inode *dir = dentry->d_parent->d_inode; |
1da177e4 | 311 | |
a41f1a47 JM |
312 | /* This is the xattr dir, handle specially. */ |
313 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
314 | return xattr_rmdir(dir, dentry); | |
1da177e4 | 315 | |
a41f1a47 JM |
316 | return xattr_unlink(dir, dentry); |
317 | } | |
bd4c625c | 318 | |
a41f1a47 JM |
319 | static int chown_one_xattr(struct dentry *dentry, void *data) |
320 | { | |
321 | struct iattr *attrs = data; | |
322 | return reiserfs_setattr(dentry, attrs); | |
323 | } | |
1da177e4 | 324 | |
a41f1a47 JM |
325 | /* No i_mutex, but the inode is unconnected. */ |
326 | int reiserfs_delete_xattrs(struct inode *inode) | |
327 | { | |
328 | int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); | |
329 | if (err) | |
330 | reiserfs_warning(inode->i_sb, "jdm-20004", | |
331 | "Couldn't delete all xattrs (%d)\n", err); | |
a72bdb1c JM |
332 | return err; |
333 | } | |
1da177e4 | 334 | |
a41f1a47 | 335 | /* inode->i_mutex: down */ |
a72bdb1c JM |
336 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
337 | { | |
a41f1a47 | 338 | int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); |
8b6dd72a JM |
339 | if (err) |
340 | reiserfs_warning(inode->i_sb, "jdm-20007", | |
341 | "Couldn't chown all xattrs (%d)\n", err); | |
a72bdb1c | 342 | return err; |
1da177e4 LT |
343 | } |
344 | ||
a72bdb1c | 345 | #ifdef CONFIG_REISERFS_FS_XATTR |
a72bdb1c JM |
346 | /* Returns a dentry corresponding to a specific extended attribute file |
347 | * for the inode. If flags allow, the file is created. Otherwise, a | |
348 | * valid or negative dentry, or an error is returned. */ | |
48b32a35 JM |
349 | static struct dentry *xattr_lookup(struct inode *inode, const char *name, |
350 | int flags) | |
1da177e4 | 351 | { |
a72bdb1c JM |
352 | struct dentry *xadir, *xafile; |
353 | int err = 0; | |
354 | ||
355 | xadir = open_xa_dir(inode, flags); | |
6c17675e | 356 | if (IS_ERR(xadir)) |
a72bdb1c | 357 | return ERR_CAST(xadir); |
a72bdb1c | 358 | |
5a6059c3 | 359 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
a72bdb1c JM |
360 | xafile = lookup_one_len(name, xadir, strlen(name)); |
361 | if (IS_ERR(xafile)) { | |
6c17675e JM |
362 | err = PTR_ERR(xafile); |
363 | goto out; | |
bd4c625c | 364 | } |
a72bdb1c | 365 | |
6c17675e JM |
366 | if (xafile->d_inode && (flags & XATTR_CREATE)) |
367 | err = -EEXIST; | |
a72bdb1c | 368 | |
6c17675e JM |
369 | if (!xafile->d_inode) { |
370 | err = -ENODATA; | |
5a6059c3 | 371 | if (xattr_may_create(flags)) |
6c17675e JM |
372 | err = xattr_create(xadir->d_inode, xafile, |
373 | 0700|S_IFREG); | |
a72bdb1c JM |
374 | } |
375 | ||
6c17675e JM |
376 | if (err) |
377 | dput(xafile); | |
a72bdb1c | 378 | out: |
5a6059c3 | 379 | mutex_unlock(&xadir->d_inode->i_mutex); |
a72bdb1c JM |
380 | dput(xadir); |
381 | if (err) | |
6c17675e | 382 | return ERR_PTR(err); |
a72bdb1c | 383 | return xafile; |
1da177e4 LT |
384 | } |
385 | ||
1da177e4 | 386 | /* Internal operations on file data */ |
bd4c625c | 387 | static inline void reiserfs_put_page(struct page *page) |
1da177e4 | 388 | { |
bd4c625c LT |
389 | kunmap(page); |
390 | page_cache_release(page); | |
1da177e4 LT |
391 | } |
392 | ||
ec6ea56b | 393 | static struct page *reiserfs_get_page(struct inode *dir, size_t n) |
1da177e4 | 394 | { |
bd4c625c LT |
395 | struct address_space *mapping = dir->i_mapping; |
396 | struct page *page; | |
397 | /* We can deadlock if we try to free dentries, | |
398 | and an unlink/rmdir has just occured - GFP_NOFS avoids this */ | |
c4cdd038 | 399 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
ec6ea56b | 400 | page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL); |
bd4c625c | 401 | if (!IS_ERR(page)) { |
bd4c625c | 402 | kmap(page); |
bd4c625c LT |
403 | if (PageError(page)) |
404 | goto fail; | |
405 | } | |
406 | return page; | |
407 | ||
408 | fail: | |
409 | reiserfs_put_page(page); | |
410 | return ERR_PTR(-EIO); | |
1da177e4 LT |
411 | } |
412 | ||
bd4c625c | 413 | static inline __u32 xattr_hash(const char *msg, int len) |
1da177e4 | 414 | { |
bd4c625c | 415 | return csum_partial(msg, len, 0); |
1da177e4 LT |
416 | } |
417 | ||
ba9d8cec VS |
418 | int reiserfs_commit_write(struct file *f, struct page *page, |
419 | unsigned from, unsigned to); | |
420 | int reiserfs_prepare_write(struct file *f, struct page *page, | |
421 | unsigned from, unsigned to); | |
422 | ||
48b32a35 JM |
423 | static void update_ctime(struct inode *inode) |
424 | { | |
425 | struct timespec now = current_fs_time(inode->i_sb); | |
426 | if (hlist_unhashed(&inode->i_hash) || !inode->i_nlink || | |
427 | timespec_equal(&inode->i_ctime, &now)) | |
428 | return; | |
429 | ||
430 | inode->i_ctime = CURRENT_TIME_SEC; | |
431 | mark_inode_dirty(inode); | |
432 | } | |
433 | ||
434 | static int lookup_and_delete_xattr(struct inode *inode, const char *name) | |
435 | { | |
436 | int err = 0; | |
437 | struct dentry *dentry, *xadir; | |
438 | ||
439 | xadir = open_xa_dir(inode, XATTR_REPLACE); | |
440 | if (IS_ERR(xadir)) | |
441 | return PTR_ERR(xadir); | |
442 | ||
5a6059c3 | 443 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
48b32a35 JM |
444 | dentry = lookup_one_len(name, xadir, strlen(name)); |
445 | if (IS_ERR(dentry)) { | |
446 | err = PTR_ERR(dentry); | |
447 | goto out_dput; | |
448 | } | |
449 | ||
450 | if (dentry->d_inode) { | |
48b32a35 | 451 | err = xattr_unlink(xadir->d_inode, dentry); |
48b32a35 JM |
452 | update_ctime(inode); |
453 | } | |
454 | ||
455 | dput(dentry); | |
456 | out_dput: | |
5a6059c3 | 457 | mutex_unlock(&xadir->d_inode->i_mutex); |
48b32a35 JM |
458 | dput(xadir); |
459 | return err; | |
460 | } | |
461 | ||
ba9d8cec | 462 | |
1da177e4 LT |
463 | /* Generic extended attribute operations that can be used by xa plugins */ |
464 | ||
465 | /* | |
1b1dcc1b | 466 | * inode->i_mutex: down |
1da177e4 LT |
467 | */ |
468 | int | |
0ab2621e JM |
469 | reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, |
470 | struct inode *inode, const char *name, | |
471 | const void *buffer, size_t buffer_size, int flags) | |
1da177e4 | 472 | { |
bd4c625c | 473 | int err = 0; |
3227e14c | 474 | struct dentry *dentry; |
bd4c625c LT |
475 | struct page *page; |
476 | char *data; | |
bd4c625c LT |
477 | size_t file_pos = 0; |
478 | size_t buffer_pos = 0; | |
48b32a35 | 479 | size_t new_size; |
bd4c625c LT |
480 | __u32 xahash = 0; |
481 | ||
bd4c625c LT |
482 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
483 | return -EOPNOTSUPP; | |
484 | ||
8b6dd72a | 485 | if (!buffer) |
48b32a35 | 486 | return lookup_and_delete_xattr(inode, name); |
bd4c625c | 487 | |
48b32a35 JM |
488 | dentry = xattr_lookup(inode, name, flags); |
489 | if (IS_ERR(dentry)) | |
490 | return PTR_ERR(dentry); | |
bd4c625c | 491 | |
0719d343 | 492 | reiserfs_down_read_safe(&REISERFS_I(inode)->i_xattr_sem, inode->i_sb); |
bd4c625c | 493 | |
8b6dd72a | 494 | xahash = xattr_hash(buffer, buffer_size); |
bd4c625c LT |
495 | while (buffer_pos < buffer_size || buffer_pos == 0) { |
496 | size_t chunk; | |
497 | size_t skip = 0; | |
498 | size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1)); | |
499 | if (buffer_size - buffer_pos > PAGE_CACHE_SIZE) | |
500 | chunk = PAGE_CACHE_SIZE; | |
501 | else | |
502 | chunk = buffer_size - buffer_pos; | |
503 | ||
ec6ea56b | 504 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
505 | if (IS_ERR(page)) { |
506 | err = PTR_ERR(page); | |
48b32a35 | 507 | goto out_unlock; |
bd4c625c LT |
508 | } |
509 | ||
510 | lock_page(page); | |
511 | data = page_address(page); | |
512 | ||
513 | if (file_pos == 0) { | |
514 | struct reiserfs_xattr_header *rxh; | |
515 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
516 | if (chunk + skip > PAGE_CACHE_SIZE) | |
517 | chunk = PAGE_CACHE_SIZE - skip; | |
518 | rxh = (struct reiserfs_xattr_header *)data; | |
519 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); | |
520 | rxh->h_hash = cpu_to_le32(xahash); | |
521 | } | |
522 | ||
3227e14c | 523 | err = reiserfs_prepare_write(NULL, page, page_offset, |
ba9d8cec | 524 | page_offset + chunk + skip); |
bd4c625c LT |
525 | if (!err) { |
526 | if (buffer) | |
527 | memcpy(data + skip, buffer + buffer_pos, chunk); | |
3227e14c JM |
528 | err = reiserfs_commit_write(NULL, page, page_offset, |
529 | page_offset + chunk + | |
530 | skip); | |
bd4c625c LT |
531 | } |
532 | unlock_page(page); | |
533 | reiserfs_put_page(page); | |
534 | buffer_pos += chunk; | |
535 | file_pos += chunk; | |
536 | skip = 0; | |
537 | if (err || buffer_size == 0 || !buffer) | |
538 | break; | |
539 | } | |
540 | ||
48b32a35 JM |
541 | new_size = buffer_size + sizeof(struct reiserfs_xattr_header); |
542 | if (!err && new_size < i_size_read(dentry->d_inode)) { | |
543 | struct iattr newattrs = { | |
544 | .ia_ctime = current_fs_time(inode->i_sb), | |
545 | .ia_size = buffer_size, | |
546 | .ia_valid = ATTR_SIZE | ATTR_CTIME, | |
547 | }; | |
548 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR); | |
549 | down_write(&dentry->d_inode->i_alloc_sem); | |
550 | err = reiserfs_setattr(dentry, &newattrs); | |
551 | up_write(&dentry->d_inode->i_alloc_sem); | |
552 | mutex_unlock(&dentry->d_inode->i_mutex); | |
553 | } else | |
554 | update_ctime(inode); | |
555 | out_unlock: | |
8b6dd72a | 556 | up_write(&REISERFS_I(inode)->i_xattr_sem); |
3227e14c | 557 | dput(dentry); |
48b32a35 JM |
558 | return err; |
559 | } | |
bd4c625c | 560 | |
0ab2621e JM |
561 | /* We need to start a transaction to maintain lock ordering */ |
562 | int reiserfs_xattr_set(struct inode *inode, const char *name, | |
563 | const void *buffer, size_t buffer_size, int flags) | |
48b32a35 | 564 | { |
0ab2621e JM |
565 | |
566 | struct reiserfs_transaction_handle th; | |
567 | int error, error2; | |
568 | size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size); | |
569 | ||
570 | if (!(flags & XATTR_REPLACE)) | |
571 | jbegin_count += reiserfs_xattr_jcreate_nblocks(inode); | |
572 | ||
573 | reiserfs_write_lock(inode->i_sb); | |
574 | error = journal_begin(&th, inode->i_sb, jbegin_count); | |
575 | if (error) { | |
576 | reiserfs_write_unlock(inode->i_sb); | |
577 | return error; | |
1da177e4 | 578 | } |
bd4c625c | 579 | |
0ab2621e JM |
580 | error = reiserfs_xattr_set_handle(&th, inode, name, |
581 | buffer, buffer_size, flags); | |
bd4c625c | 582 | |
0ab2621e JM |
583 | error2 = journal_end(&th, inode->i_sb, jbegin_count); |
584 | if (error == 0) | |
585 | error = error2; | |
586 | reiserfs_write_unlock(inode->i_sb); | |
587 | ||
588 | return error; | |
1da177e4 LT |
589 | } |
590 | ||
591 | /* | |
1b1dcc1b | 592 | * inode->i_mutex: down |
1da177e4 LT |
593 | */ |
594 | int | |
48b32a35 | 595 | reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, |
bd4c625c | 596 | size_t buffer_size) |
1da177e4 | 597 | { |
bd4c625c | 598 | ssize_t err = 0; |
3227e14c | 599 | struct dentry *dentry; |
bd4c625c LT |
600 | size_t isize; |
601 | size_t file_pos = 0; | |
602 | size_t buffer_pos = 0; | |
603 | struct page *page; | |
bd4c625c LT |
604 | __u32 hash = 0; |
605 | ||
606 | if (name == NULL) | |
607 | return -EINVAL; | |
608 | ||
609 | /* We can't have xattrs attached to v1 items since they don't have | |
610 | * generation numbers */ | |
611 | if (get_inode_sd_version(inode) == STAT_DATA_V1) | |
612 | return -EOPNOTSUPP; | |
613 | ||
48b32a35 | 614 | dentry = xattr_lookup(inode, name, XATTR_REPLACE); |
3227e14c JM |
615 | if (IS_ERR(dentry)) { |
616 | err = PTR_ERR(dentry); | |
bd4c625c LT |
617 | goto out; |
618 | } | |
619 | ||
8b6dd72a | 620 | down_read(&REISERFS_I(inode)->i_xattr_sem); |
d984561b | 621 | |
f437c529 | 622 | isize = i_size_read(dentry->d_inode); |
bd4c625c LT |
623 | |
624 | /* Just return the size needed */ | |
625 | if (buffer == NULL) { | |
626 | err = isize - sizeof(struct reiserfs_xattr_header); | |
8b6dd72a | 627 | goto out_unlock; |
bd4c625c LT |
628 | } |
629 | ||
630 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { | |
631 | err = -ERANGE; | |
8b6dd72a | 632 | goto out_unlock; |
bd4c625c LT |
633 | } |
634 | ||
635 | while (file_pos < isize) { | |
636 | size_t chunk; | |
637 | char *data; | |
638 | size_t skip = 0; | |
639 | if (isize - file_pos > PAGE_CACHE_SIZE) | |
640 | chunk = PAGE_CACHE_SIZE; | |
641 | else | |
642 | chunk = isize - file_pos; | |
643 | ||
a72bdb1c | 644 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
645 | if (IS_ERR(page)) { |
646 | err = PTR_ERR(page); | |
8b6dd72a | 647 | goto out_unlock; |
bd4c625c LT |
648 | } |
649 | ||
650 | lock_page(page); | |
651 | data = page_address(page); | |
652 | if (file_pos == 0) { | |
653 | struct reiserfs_xattr_header *rxh = | |
654 | (struct reiserfs_xattr_header *)data; | |
655 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
656 | chunk -= skip; | |
657 | /* Magic doesn't match up.. */ | |
658 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { | |
659 | unlock_page(page); | |
660 | reiserfs_put_page(page); | |
a72bdb1c | 661 | reiserfs_warning(inode->i_sb, "jdm-20001", |
bd4c625c LT |
662 | "Invalid magic for xattr (%s) " |
663 | "associated with %k", name, | |
664 | INODE_PKEY(inode)); | |
665 | err = -EIO; | |
8b6dd72a | 666 | goto out_unlock; |
bd4c625c LT |
667 | } |
668 | hash = le32_to_cpu(rxh->h_hash); | |
669 | } | |
670 | memcpy(buffer + buffer_pos, data + skip, chunk); | |
671 | unlock_page(page); | |
672 | reiserfs_put_page(page); | |
673 | file_pos += chunk; | |
674 | buffer_pos += chunk; | |
675 | skip = 0; | |
676 | } | |
677 | err = isize - sizeof(struct reiserfs_xattr_header); | |
678 | ||
679 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != | |
680 | hash) { | |
a72bdb1c | 681 | reiserfs_warning(inode->i_sb, "jdm-20002", |
bd4c625c LT |
682 | "Invalid hash for xattr (%s) associated " |
683 | "with %k", name, INODE_PKEY(inode)); | |
684 | err = -EIO; | |
685 | } | |
686 | ||
8b6dd72a JM |
687 | out_unlock: |
688 | up_read(&REISERFS_I(inode)->i_xattr_sem); | |
3227e14c | 689 | dput(dentry); |
bd4c625c | 690 | |
a72bdb1c | 691 | out: |
bd4c625c | 692 | return err; |
1da177e4 LT |
693 | } |
694 | ||
48b32a35 JM |
695 | /* |
696 | * In order to implement different sets of xattr operations for each xattr | |
697 | * prefix with the generic xattr API, a filesystem should create a | |
698 | * null-terminated array of struct xattr_handler (one for each prefix) and | |
699 | * hang a pointer to it off of the s_xattr field of the superblock. | |
700 | * | |
701 | * The generic_fooxattr() functions will use this list to dispatch xattr | |
702 | * operations to the correct xattr_handler. | |
703 | */ | |
704 | #define for_each_xattr_handler(handlers, handler) \ | |
705 | for ((handler) = *(handlers)++; \ | |
706 | (handler) != NULL; \ | |
707 | (handler) = *(handlers)++) | |
1da177e4 | 708 | |
48b32a35 JM |
709 | /* This is the implementation for the xattr plugin infrastructure */ |
710 | static inline struct xattr_handler * | |
711 | find_xattr_handler_prefix(struct xattr_handler **handlers, | |
712 | const char *name) | |
1da177e4 | 713 | { |
48b32a35 | 714 | struct xattr_handler *xah; |
bd4c625c | 715 | |
48b32a35 JM |
716 | if (!handlers) |
717 | return NULL; | |
bd4c625c | 718 | |
48b32a35 JM |
719 | for_each_xattr_handler(handlers, xah) { |
720 | if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0) | |
721 | break; | |
bd4c625c LT |
722 | } |
723 | ||
48b32a35 | 724 | return xah; |
bd4c625c | 725 | } |
1da177e4 | 726 | |
1da177e4 LT |
727 | |
728 | /* | |
729 | * Inode operation getxattr() | |
1da177e4 LT |
730 | */ |
731 | ssize_t | |
bd4c625c LT |
732 | reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, |
733 | size_t size) | |
1da177e4 | 734 | { |
48b32a35 JM |
735 | struct inode *inode = dentry->d_inode; |
736 | struct xattr_handler *handler; | |
bd4c625c | 737 | |
48b32a35 JM |
738 | handler = find_xattr_handler_prefix(inode->i_sb->s_xattr, name); |
739 | ||
740 | if (!handler || get_inode_sd_version(inode) == STAT_DATA_V1) | |
bd4c625c LT |
741 | return -EOPNOTSUPP; |
742 | ||
48b32a35 | 743 | return handler->get(inode, name, buffer, size); |
1da177e4 LT |
744 | } |
745 | ||
1da177e4 LT |
746 | /* |
747 | * Inode operation setxattr() | |
748 | * | |
1b1dcc1b | 749 | * dentry->d_inode->i_mutex down |
1da177e4 LT |
750 | */ |
751 | int | |
bd4c625c LT |
752 | reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
753 | size_t size, int flags) | |
1da177e4 | 754 | { |
48b32a35 JM |
755 | struct inode *inode = dentry->d_inode; |
756 | struct xattr_handler *handler; | |
bd4c625c | 757 | |
48b32a35 JM |
758 | handler = find_xattr_handler_prefix(inode->i_sb->s_xattr, name); |
759 | ||
760 | if (!handler || get_inode_sd_version(inode) == STAT_DATA_V1) | |
bd4c625c LT |
761 | return -EOPNOTSUPP; |
762 | ||
48b32a35 | 763 | return handler->set(inode, name, value, size, flags); |
1da177e4 LT |
764 | } |
765 | ||
766 | /* | |
767 | * Inode operation removexattr() | |
768 | * | |
1b1dcc1b | 769 | * dentry->d_inode->i_mutex down |
1da177e4 | 770 | */ |
bd4c625c | 771 | int reiserfs_removexattr(struct dentry *dentry, const char *name) |
1da177e4 | 772 | { |
48b32a35 JM |
773 | struct inode *inode = dentry->d_inode; |
774 | struct xattr_handler *handler; | |
775 | handler = find_xattr_handler_prefix(inode->i_sb->s_xattr, name); | |
1da177e4 | 776 | |
48b32a35 | 777 | if (!handler || get_inode_sd_version(inode) == STAT_DATA_V1) |
bd4c625c | 778 | return -EOPNOTSUPP; |
1da177e4 | 779 | |
48b32a35 | 780 | return handler->set(inode, name, NULL, 0, XATTR_REPLACE); |
1da177e4 LT |
781 | } |
782 | ||
48b32a35 JM |
783 | struct listxattr_buf { |
784 | size_t size; | |
785 | size_t pos; | |
786 | char *buf; | |
787 | struct inode *inode; | |
1da177e4 LT |
788 | }; |
789 | ||
48b32a35 JM |
790 | static int listxattr_filler(void *buf, const char *name, int namelen, |
791 | loff_t offset, u64 ino, unsigned int d_type) | |
1da177e4 | 792 | { |
48b32a35 JM |
793 | struct listxattr_buf *b = (struct listxattr_buf *)buf; |
794 | size_t size; | |
795 | if (name[0] != '.' || | |
796 | (namelen != 1 && (name[1] != '.' || namelen != 2))) { | |
797 | struct xattr_handler *handler; | |
798 | handler = find_xattr_handler_prefix(b->inode->i_sb->s_xattr, | |
799 | name); | |
800 | if (!handler) /* Unsupported xattr name */ | |
801 | return 0; | |
802 | if (b->buf) { | |
803 | size = handler->list(b->inode, b->buf + b->pos, | |
804 | b->size, name, namelen); | |
805 | if (size > b->size) | |
806 | return -ERANGE; | |
807 | } else { | |
808 | size = handler->list(b->inode, NULL, 0, name, namelen); | |
bd4c625c | 809 | } |
bd4c625c | 810 | |
48b32a35 JM |
811 | b->pos += size; |
812 | } | |
bd4c625c | 813 | return 0; |
1da177e4 | 814 | } |
bd4c625c | 815 | |
1da177e4 LT |
816 | /* |
817 | * Inode operation listxattr() | |
818 | * | |
48b32a35 JM |
819 | * We totally ignore the generic listxattr here because it would be stupid |
820 | * not to. Since the xattrs are organized in a directory, we can just | |
821 | * readdir to find them. | |
1da177e4 | 822 | */ |
bd4c625c | 823 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
1da177e4 | 824 | { |
bd4c625c LT |
825 | struct dentry *dir; |
826 | int err = 0; | |
a41f1a47 | 827 | loff_t pos = 0; |
48b32a35 JM |
828 | struct listxattr_buf buf = { |
829 | .inode = dentry->d_inode, | |
830 | .buf = buffer, | |
831 | .size = buffer ? size : 0, | |
832 | }; | |
bd4c625c LT |
833 | |
834 | if (!dentry->d_inode) | |
835 | return -EINVAL; | |
836 | ||
677c9b2e | 837 | if (!dentry->d_sb->s_xattr || |
bd4c625c LT |
838 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
839 | return -EOPNOTSUPP; | |
840 | ||
6c17675e | 841 | dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE); |
bd4c625c LT |
842 | if (IS_ERR(dir)) { |
843 | err = PTR_ERR(dir); | |
844 | if (err == -ENODATA) | |
48b32a35 | 845 | err = 0; /* Not an error if there aren't any xattrs */ |
bd4c625c LT |
846 | goto out; |
847 | } | |
848 | ||
6c17675e | 849 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
a41f1a47 | 850 | err = reiserfs_readdir_dentry(dir, &buf, listxattr_filler, &pos); |
6c17675e | 851 | mutex_unlock(&dir->d_inode->i_mutex); |
bd4c625c | 852 | |
48b32a35 JM |
853 | if (!err) |
854 | err = buf.pos; | |
bd4c625c | 855 | |
3227e14c | 856 | dput(dir); |
8b6dd72a | 857 | out: |
bd4c625c | 858 | return err; |
1da177e4 LT |
859 | } |
860 | ||
a72bdb1c | 861 | static int reiserfs_check_acl(struct inode *inode, int mask) |
1da177e4 | 862 | { |
a72bdb1c JM |
863 | struct posix_acl *acl; |
864 | int error = -EAGAIN; /* do regular unix permission checks by default */ | |
bd4c625c | 865 | |
a72bdb1c JM |
866 | acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS); |
867 | ||
a72bdb1c JM |
868 | if (acl) { |
869 | if (!IS_ERR(acl)) { | |
870 | error = posix_acl_permission(inode, acl, mask); | |
871 | posix_acl_release(acl); | |
872 | } else if (PTR_ERR(acl) != -ENODATA) | |
873 | error = PTR_ERR(acl); | |
bd4c625c LT |
874 | } |
875 | ||
a72bdb1c | 876 | return error; |
1da177e4 LT |
877 | } |
878 | ||
a72bdb1c | 879 | static int create_privroot(struct dentry *dentry) |
1da177e4 | 880 | { |
a72bdb1c JM |
881 | int err; |
882 | struct inode *inode = dentry->d_parent->d_inode; | |
5a6059c3 JM |
883 | WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex)); |
884 | ||
6c17675e | 885 | err = xattr_mkdir(inode, dentry, 0700); |
edcc37a0 AV |
886 | if (err || !dentry->d_inode) { |
887 | reiserfs_warning(dentry->d_sb, "jdm-20006", | |
888 | "xattrs/ACLs enabled and couldn't " | |
889 | "find/create .reiserfs_priv. " | |
890 | "Failing mount."); | |
891 | return -EOPNOTSUPP; | |
bd4c625c LT |
892 | } |
893 | ||
edcc37a0 AV |
894 | dentry->d_inode->i_flags |= S_PRIVATE; |
895 | reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr " | |
896 | "storage.\n", PRIVROOT_NAME); | |
bd4c625c | 897 | |
edcc37a0 | 898 | return 0; |
1da177e4 LT |
899 | } |
900 | ||
12abb35a JM |
901 | #else |
902 | int __init reiserfs_xattr_register_handlers(void) { return 0; } | |
903 | void reiserfs_xattr_unregister_handlers(void) {} | |
904 | static int create_privroot(struct dentry *dentry) { return 0; } | |
905 | #endif | |
906 | ||
907 | /* Actual operations that are exported to VFS-land */ | |
908 | struct xattr_handler *reiserfs_xattr_handlers[] = { | |
909 | #ifdef CONFIG_REISERFS_FS_XATTR | |
910 | &reiserfs_xattr_user_handler, | |
911 | &reiserfs_xattr_trusted_handler, | |
912 | #endif | |
913 | #ifdef CONFIG_REISERFS_FS_SECURITY | |
914 | &reiserfs_xattr_security_handler, | |
915 | #endif | |
916 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL | |
917 | &reiserfs_posix_acl_access_handler, | |
918 | &reiserfs_posix_acl_default_handler, | |
919 | #endif | |
920 | NULL | |
921 | }; | |
922 | ||
a72bdb1c | 923 | static int xattr_mount_check(struct super_block *s) |
1da177e4 | 924 | { |
a72bdb1c JM |
925 | /* We need generation numbers to ensure that the oid mapping is correct |
926 | * v3.5 filesystems don't have them. */ | |
48b32a35 JM |
927 | if (old_format_only(s)) { |
928 | if (reiserfs_xattrs_optional(s)) { | |
929 | /* Old format filesystem, but optional xattrs have | |
930 | * been enabled. Error out. */ | |
931 | reiserfs_warning(s, "jdm-2005", | |
932 | "xattrs/ACLs not supported " | |
933 | "on pre-v3.6 format filesystems. " | |
934 | "Failing mount."); | |
935 | return -EOPNOTSUPP; | |
936 | } | |
a72bdb1c JM |
937 | } |
938 | ||
939 | return 0; | |
1da177e4 LT |
940 | } |
941 | ||
b83674c0 JM |
942 | int reiserfs_permission(struct inode *inode, int mask) |
943 | { | |
944 | /* | |
945 | * We don't do permission checks on the internal objects. | |
946 | * Permissions are determined by the "owning" object. | |
947 | */ | |
948 | if (IS_PRIVATE(inode)) | |
949 | return 0; | |
950 | ||
951 | #ifdef CONFIG_REISERFS_FS_XATTR | |
952 | /* | |
953 | * Stat data v1 doesn't support ACLs. | |
954 | */ | |
955 | if (get_inode_sd_version(inode) != STAT_DATA_V1) | |
956 | return generic_permission(inode, mask, reiserfs_check_acl); | |
957 | #endif | |
958 | return generic_permission(inode, mask, NULL); | |
959 | } | |
960 | ||
1da177e4 LT |
961 | /* This will catch lookups from the fs root to .reiserfs_priv */ |
962 | static int | |
bd4c625c | 963 | xattr_lookup_poison(struct dentry *dentry, struct qstr *q1, struct qstr *name) |
1da177e4 | 964 | { |
bd4c625c | 965 | struct dentry *priv_root = REISERFS_SB(dentry->d_sb)->priv_root; |
edcc37a0 | 966 | if (container_of(q1, struct dentry, d_name) == priv_root) |
bd4c625c | 967 | return -ENOENT; |
edcc37a0 | 968 | if (q1->len == name->len && |
bd4c625c LT |
969 | !memcmp(q1->name, name->name, name->len)) |
970 | return 0; | |
971 | return 1; | |
1da177e4 LT |
972 | } |
973 | ||
e16404ed | 974 | static const struct dentry_operations xattr_lookup_poison_ops = { |
bd4c625c | 975 | .d_compare = xattr_lookup_poison, |
1da177e4 LT |
976 | }; |
977 | ||
edcc37a0 AV |
978 | int reiserfs_lookup_privroot(struct super_block *s) |
979 | { | |
980 | struct dentry *dentry; | |
981 | int err = 0; | |
982 | ||
983 | /* If we don't have the privroot located yet - go find it */ | |
c72e0575 | 984 | reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s); |
edcc37a0 AV |
985 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, |
986 | strlen(PRIVROOT_NAME)); | |
987 | if (!IS_ERR(dentry)) { | |
988 | REISERFS_SB(s)->priv_root = dentry; | |
73422811 JM |
989 | if (!reiserfs_expose_privroot(s)) |
990 | s->s_root->d_op = &xattr_lookup_poison_ops; | |
edcc37a0 AV |
991 | if (dentry->d_inode) |
992 | dentry->d_inode->i_flags |= S_PRIVATE; | |
993 | } else | |
994 | err = PTR_ERR(dentry); | |
995 | mutex_unlock(&s->s_root->d_inode->i_mutex); | |
996 | ||
997 | return err; | |
998 | } | |
999 | ||
1da177e4 LT |
1000 | /* We need to take a copy of the mount flags since things like |
1001 | * MS_RDONLY don't get set until *after* we're called. | |
1002 | * mount_flags != mount_options */ | |
bd4c625c | 1003 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
1da177e4 | 1004 | { |
bd4c625c | 1005 | int err = 0; |
ab17c4f0 | 1006 | struct dentry *privroot = REISERFS_SB(s)->priv_root; |
bd4c625c | 1007 | |
a72bdb1c JM |
1008 | err = xattr_mount_check(s); |
1009 | if (err) | |
bd4c625c | 1010 | goto error; |
bd4c625c | 1011 | |
ab17c4f0 | 1012 | if (!privroot->d_inode && !(mount_flags & MS_RDONLY)) { |
ae635c0b | 1013 | reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s); |
edcc37a0 | 1014 | err = create_privroot(REISERFS_SB(s)->priv_root); |
5a6059c3 | 1015 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
bd4c625c | 1016 | } |
ab17c4f0 JM |
1017 | |
1018 | if (privroot->d_inode) { | |
48b32a35 | 1019 | s->s_xattr = reiserfs_xattr_handlers; |
c72e0575 | 1020 | reiserfs_mutex_lock_safe(&privroot->d_inode->i_mutex, s); |
ab17c4f0 JM |
1021 | if (!REISERFS_SB(s)->xattr_root) { |
1022 | struct dentry *dentry; | |
1023 | dentry = lookup_one_len(XAROOT_NAME, privroot, | |
1024 | strlen(XAROOT_NAME)); | |
1025 | if (!IS_ERR(dentry)) | |
1026 | REISERFS_SB(s)->xattr_root = dentry; | |
1027 | else | |
1028 | err = PTR_ERR(dentry); | |
1029 | } | |
1030 | mutex_unlock(&privroot->d_inode->i_mutex); | |
1031 | } | |
48b32a35 | 1032 | |
a72bdb1c | 1033 | error: |
bd4c625c | 1034 | if (err) { |
bd4c625c LT |
1035 | clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt)); |
1036 | clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt)); | |
1037 | } | |
1038 | ||
1039 | /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */ | |
bd4c625c LT |
1040 | if (reiserfs_posixacl(s)) |
1041 | s->s_flags |= MS_POSIXACL; | |
ab17c4f0 | 1042 | else |
ab17c4f0 | 1043 | s->s_flags &= ~MS_POSIXACL; |
bd4c625c LT |
1044 | |
1045 | return err; | |
1da177e4 | 1046 | } |