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> |
431547b3 | 51 | #include <linux/security.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 | ||
ab17c4f0 | 116 | static struct dentry *open_xa_root(struct super_block *sb, int flags) |
6c17675e | 117 | { |
ab17c4f0 JM |
118 | struct dentry *privroot = REISERFS_SB(sb)->priv_root; |
119 | struct dentry *xaroot; | |
120 | if (!privroot->d_inode) | |
121 | return ERR_PTR(-ENODATA); | |
6c17675e | 122 | |
ab17c4f0 | 123 | mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR); |
6c17675e | 124 | |
ab17c4f0 | 125 | xaroot = dget(REISERFS_SB(sb)->xattr_root); |
ceb5edc4 JM |
126 | if (!xaroot) |
127 | xaroot = ERR_PTR(-ENODATA); | |
128 | else if (!xaroot->d_inode) { | |
ab17c4f0 | 129 | int err = -ENODATA; |
5a6059c3 | 130 | if (xattr_may_create(flags)) |
ab17c4f0 | 131 | err = xattr_mkdir(privroot->d_inode, xaroot, 0700); |
9b7f3755 | 132 | if (err) { |
ab17c4f0 JM |
133 | dput(xaroot); |
134 | xaroot = ERR_PTR(err); | |
9b7f3755 | 135 | } |
bd4c625c | 136 | } |
6c17675e | 137 | |
ab17c4f0 JM |
138 | mutex_unlock(&privroot->d_inode->i_mutex); |
139 | return xaroot; | |
1da177e4 LT |
140 | } |
141 | ||
bd4c625c | 142 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
1da177e4 | 143 | { |
bd4c625c LT |
144 | struct dentry *xaroot, *xadir; |
145 | char namebuf[17]; | |
146 | ||
6c17675e | 147 | xaroot = open_xa_root(inode->i_sb, flags); |
9b7f3755 | 148 | if (IS_ERR(xaroot)) |
bd4c625c | 149 | return xaroot; |
bd4c625c | 150 | |
bd4c625c LT |
151 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
152 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), | |
153 | inode->i_generation); | |
bd4c625c | 154 | |
ab17c4f0 JM |
155 | mutex_lock_nested(&xaroot->d_inode->i_mutex, I_MUTEX_XATTR); |
156 | ||
157 | xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf)); | |
158 | if (!IS_ERR(xadir) && !xadir->d_inode) { | |
159 | int err = -ENODATA; | |
160 | if (xattr_may_create(flags)) | |
161 | err = xattr_mkdir(xaroot->d_inode, xadir, 0700); | |
162 | if (err) { | |
163 | dput(xadir); | |
164 | xadir = ERR_PTR(err); | |
165 | } | |
166 | } | |
167 | ||
168 | mutex_unlock(&xaroot->d_inode->i_mutex); | |
bd4c625c LT |
169 | dput(xaroot); |
170 | return xadir; | |
1da177e4 LT |
171 | } |
172 | ||
48b32a35 JM |
173 | /* The following are side effects of other operations that aren't explicitly |
174 | * modifying extended attributes. This includes operations such as permissions | |
175 | * or ownership changes, object deletions, etc. */ | |
a41f1a47 JM |
176 | struct reiserfs_dentry_buf { |
177 | struct dentry *xadir; | |
178 | int count; | |
179 | struct dentry *dentries[8]; | |
180 | }; | |
bd4c625c | 181 | |
a72bdb1c | 182 | static int |
a41f1a47 JM |
183 | fill_with_dentries(void *buf, const char *name, int namelen, loff_t offset, |
184 | u64 ino, unsigned int d_type) | |
a72bdb1c | 185 | { |
a41f1a47 | 186 | struct reiserfs_dentry_buf *dbuf = buf; |
a72bdb1c | 187 | struct dentry *dentry; |
5a6059c3 | 188 | WARN_ON_ONCE(!mutex_is_locked(&dbuf->xadir->d_inode->i_mutex)); |
bd4c625c | 189 | |
a41f1a47 JM |
190 | if (dbuf->count == ARRAY_SIZE(dbuf->dentries)) |
191 | return -ENOSPC; | |
bd4c625c | 192 | |
a41f1a47 JM |
193 | if (name[0] == '.' && (name[1] == '\0' || |
194 | (name[1] == '.' && name[2] == '\0'))) | |
195 | return 0; | |
bd4c625c | 196 | |
a41f1a47 | 197 | dentry = lookup_one_len(name, dbuf->xadir, namelen); |
a72bdb1c | 198 | if (IS_ERR(dentry)) { |
a41f1a47 | 199 | return PTR_ERR(dentry); |
a72bdb1c | 200 | } else if (!dentry->d_inode) { |
a41f1a47 JM |
201 | /* A directory entry exists, but no file? */ |
202 | reiserfs_error(dentry->d_sb, "xattr-20003", | |
203 | "Corrupted directory: xattr %s listed but " | |
204 | "not found for file %s.\n", | |
205 | dentry->d_name.name, dbuf->xadir->d_name.name); | |
206 | dput(dentry); | |
207 | return -EIO; | |
bd4c625c | 208 | } |
1da177e4 | 209 | |
a41f1a47 JM |
210 | dbuf->dentries[dbuf->count++] = dentry; |
211 | return 0; | |
1da177e4 LT |
212 | } |
213 | ||
a41f1a47 JM |
214 | static void |
215 | cleanup_dentry_buf(struct reiserfs_dentry_buf *buf) | |
1da177e4 | 216 | { |
a41f1a47 JM |
217 | int i; |
218 | for (i = 0; i < buf->count; i++) | |
219 | if (buf->dentries[i]) | |
220 | dput(buf->dentries[i]); | |
a72bdb1c JM |
221 | } |
222 | ||
a41f1a47 JM |
223 | static int reiserfs_for_each_xattr(struct inode *inode, |
224 | int (*action)(struct dentry *, void *), | |
225 | void *data) | |
a72bdb1c | 226 | { |
a41f1a47 JM |
227 | struct dentry *dir; |
228 | int i, err = 0; | |
229 | loff_t pos = 0; | |
230 | struct reiserfs_dentry_buf buf = { | |
231 | .count = 0, | |
232 | }; | |
1da177e4 | 233 | |
a72bdb1c JM |
234 | /* Skip out, an xattr has no xattrs associated with it */ |
235 | if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1) | |
236 | return 0; | |
1da177e4 | 237 | |
6c17675e | 238 | dir = open_xa_dir(inode, XATTR_REPLACE); |
a72bdb1c JM |
239 | if (IS_ERR(dir)) { |
240 | err = PTR_ERR(dir); | |
241 | goto out; | |
242 | } else if (!dir->d_inode) { | |
a41f1a47 JM |
243 | err = 0; |
244 | goto out_dir; | |
a72bdb1c | 245 | } |
1da177e4 | 246 | |
6c17675e | 247 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
a41f1a47 JM |
248 | buf.xadir = dir; |
249 | err = reiserfs_readdir_dentry(dir, &buf, fill_with_dentries, &pos); | |
250 | while ((err == 0 || err == -ENOSPC) && buf.count) { | |
251 | err = 0; | |
1da177e4 | 252 | |
a41f1a47 JM |
253 | for (i = 0; i < buf.count && buf.dentries[i]; i++) { |
254 | int lerr = 0; | |
255 | struct dentry *dentry = buf.dentries[i]; | |
1da177e4 | 256 | |
a41f1a47 JM |
257 | if (err == 0 && !S_ISDIR(dentry->d_inode->i_mode)) |
258 | lerr = action(dentry, data); | |
1da177e4 | 259 | |
a41f1a47 JM |
260 | dput(dentry); |
261 | buf.dentries[i] = NULL; | |
262 | err = lerr ?: err; | |
bd4c625c | 263 | } |
a41f1a47 JM |
264 | buf.count = 0; |
265 | if (!err) | |
266 | err = reiserfs_readdir_dentry(dir, &buf, | |
267 | fill_with_dentries, &pos); | |
8b6dd72a | 268 | } |
a41f1a47 | 269 | mutex_unlock(&dir->d_inode->i_mutex); |
1da177e4 | 270 | |
a41f1a47 JM |
271 | /* Clean up after a failed readdir */ |
272 | cleanup_dentry_buf(&buf); | |
1da177e4 | 273 | |
d984561b | 274 | if (!err) { |
a41f1a47 JM |
275 | /* We start a transaction here to avoid a ABBA situation |
276 | * between the xattr root's i_mutex and the journal lock. | |
277 | * This doesn't incur much additional overhead since the | |
278 | * new transaction will just nest inside the | |
279 | * outer transaction. */ | |
280 | int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + | |
281 | 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); | |
282 | struct reiserfs_transaction_handle th; | |
283 | err = journal_begin(&th, inode->i_sb, blocks); | |
284 | if (!err) { | |
285 | int jerror; | |
286 | mutex_lock_nested(&dir->d_parent->d_inode->i_mutex, | |
287 | I_MUTEX_XATTR); | |
288 | err = action(dir, data); | |
289 | jerror = journal_end(&th, inode->i_sb, blocks); | |
290 | mutex_unlock(&dir->d_parent->d_inode->i_mutex); | |
291 | err = jerror ?: err; | |
292 | } | |
a72bdb1c | 293 | } |
a41f1a47 JM |
294 | out_dir: |
295 | dput(dir); | |
a72bdb1c | 296 | out: |
a41f1a47 JM |
297 | /* -ENODATA isn't an error */ |
298 | if (err == -ENODATA) | |
299 | err = 0; | |
a72bdb1c JM |
300 | return err; |
301 | } | |
1da177e4 | 302 | |
a41f1a47 | 303 | static int delete_one_xattr(struct dentry *dentry, void *data) |
a72bdb1c | 304 | { |
a41f1a47 | 305 | struct inode *dir = dentry->d_parent->d_inode; |
1da177e4 | 306 | |
a41f1a47 JM |
307 | /* This is the xattr dir, handle specially. */ |
308 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
309 | return xattr_rmdir(dir, dentry); | |
1da177e4 | 310 | |
a41f1a47 JM |
311 | return xattr_unlink(dir, dentry); |
312 | } | |
bd4c625c | 313 | |
a41f1a47 JM |
314 | static int chown_one_xattr(struct dentry *dentry, void *data) |
315 | { | |
316 | struct iattr *attrs = data; | |
317 | return reiserfs_setattr(dentry, attrs); | |
318 | } | |
1da177e4 | 319 | |
a41f1a47 JM |
320 | /* No i_mutex, but the inode is unconnected. */ |
321 | int reiserfs_delete_xattrs(struct inode *inode) | |
322 | { | |
323 | int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); | |
324 | if (err) | |
325 | reiserfs_warning(inode->i_sb, "jdm-20004", | |
326 | "Couldn't delete all xattrs (%d)\n", err); | |
a72bdb1c JM |
327 | return err; |
328 | } | |
1da177e4 | 329 | |
a41f1a47 | 330 | /* inode->i_mutex: down */ |
a72bdb1c JM |
331 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
332 | { | |
a41f1a47 | 333 | int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); |
8b6dd72a JM |
334 | if (err) |
335 | reiserfs_warning(inode->i_sb, "jdm-20007", | |
336 | "Couldn't chown all xattrs (%d)\n", err); | |
a72bdb1c | 337 | return err; |
1da177e4 LT |
338 | } |
339 | ||
a72bdb1c | 340 | #ifdef CONFIG_REISERFS_FS_XATTR |
a72bdb1c JM |
341 | /* Returns a dentry corresponding to a specific extended attribute file |
342 | * for the inode. If flags allow, the file is created. Otherwise, a | |
343 | * valid or negative dentry, or an error is returned. */ | |
48b32a35 JM |
344 | static struct dentry *xattr_lookup(struct inode *inode, const char *name, |
345 | int flags) | |
1da177e4 | 346 | { |
a72bdb1c JM |
347 | struct dentry *xadir, *xafile; |
348 | int err = 0; | |
349 | ||
350 | xadir = open_xa_dir(inode, flags); | |
6c17675e | 351 | if (IS_ERR(xadir)) |
a72bdb1c | 352 | return ERR_CAST(xadir); |
a72bdb1c | 353 | |
5a6059c3 | 354 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
a72bdb1c JM |
355 | xafile = lookup_one_len(name, xadir, strlen(name)); |
356 | if (IS_ERR(xafile)) { | |
6c17675e JM |
357 | err = PTR_ERR(xafile); |
358 | goto out; | |
bd4c625c | 359 | } |
a72bdb1c | 360 | |
6c17675e JM |
361 | if (xafile->d_inode && (flags & XATTR_CREATE)) |
362 | err = -EEXIST; | |
a72bdb1c | 363 | |
6c17675e JM |
364 | if (!xafile->d_inode) { |
365 | err = -ENODATA; | |
5a6059c3 | 366 | if (xattr_may_create(flags)) |
6c17675e JM |
367 | err = xattr_create(xadir->d_inode, xafile, |
368 | 0700|S_IFREG); | |
a72bdb1c JM |
369 | } |
370 | ||
6c17675e JM |
371 | if (err) |
372 | dput(xafile); | |
a72bdb1c | 373 | out: |
5a6059c3 | 374 | mutex_unlock(&xadir->d_inode->i_mutex); |
a72bdb1c JM |
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 | ||
5a6059c3 | 438 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
48b32a35 JM |
439 | dentry = lookup_one_len(name, xadir, strlen(name)); |
440 | if (IS_ERR(dentry)) { | |
441 | err = PTR_ERR(dentry); | |
442 | goto out_dput; | |
443 | } | |
444 | ||
445 | if (dentry->d_inode) { | |
48b32a35 | 446 | err = xattr_unlink(xadir->d_inode, dentry); |
48b32a35 JM |
447 | update_ctime(inode); |
448 | } | |
449 | ||
450 | dput(dentry); | |
451 | out_dput: | |
5a6059c3 | 452 | mutex_unlock(&xadir->d_inode->i_mutex); |
48b32a35 JM |
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 | /* |
691 | * In order to implement different sets of xattr operations for each xattr | |
692 | * prefix with the generic xattr API, a filesystem should create a | |
693 | * null-terminated array of struct xattr_handler (one for each prefix) and | |
694 | * hang a pointer to it off of the s_xattr field of the superblock. | |
695 | * | |
696 | * The generic_fooxattr() functions will use this list to dispatch xattr | |
697 | * operations to the correct xattr_handler. | |
698 | */ | |
699 | #define for_each_xattr_handler(handlers, handler) \ | |
700 | for ((handler) = *(handlers)++; \ | |
701 | (handler) != NULL; \ | |
702 | (handler) = *(handlers)++) | |
1da177e4 | 703 | |
48b32a35 JM |
704 | /* This is the implementation for the xattr plugin infrastructure */ |
705 | static inline struct xattr_handler * | |
706 | find_xattr_handler_prefix(struct xattr_handler **handlers, | |
707 | const char *name) | |
1da177e4 | 708 | { |
48b32a35 | 709 | struct xattr_handler *xah; |
bd4c625c | 710 | |
48b32a35 JM |
711 | if (!handlers) |
712 | return NULL; | |
bd4c625c | 713 | |
48b32a35 JM |
714 | for_each_xattr_handler(handlers, xah) { |
715 | if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0) | |
716 | break; | |
bd4c625c LT |
717 | } |
718 | ||
48b32a35 | 719 | return xah; |
bd4c625c | 720 | } |
1da177e4 | 721 | |
1da177e4 LT |
722 | |
723 | /* | |
724 | * Inode operation getxattr() | |
1da177e4 LT |
725 | */ |
726 | ssize_t | |
bd4c625c LT |
727 | reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, |
728 | size_t size) | |
1da177e4 | 729 | { |
48b32a35 | 730 | struct xattr_handler *handler; |
bd4c625c | 731 | |
431547b3 | 732 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 733 | |
431547b3 | 734 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c LT |
735 | return -EOPNOTSUPP; |
736 | ||
431547b3 | 737 | return handler->get(dentry, name, buffer, size, handler->flags); |
1da177e4 LT |
738 | } |
739 | ||
1da177e4 LT |
740 | /* |
741 | * Inode operation setxattr() | |
742 | * | |
1b1dcc1b | 743 | * dentry->d_inode->i_mutex down |
1da177e4 LT |
744 | */ |
745 | int | |
bd4c625c LT |
746 | reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
747 | size_t size, int flags) | |
1da177e4 | 748 | { |
48b32a35 | 749 | struct xattr_handler *handler; |
bd4c625c | 750 | |
431547b3 | 751 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 752 | |
431547b3 | 753 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c LT |
754 | return -EOPNOTSUPP; |
755 | ||
431547b3 | 756 | return handler->set(dentry, name, value, size, flags, handler->flags); |
1da177e4 LT |
757 | } |
758 | ||
759 | /* | |
760 | * Inode operation removexattr() | |
761 | * | |
1b1dcc1b | 762 | * dentry->d_inode->i_mutex down |
1da177e4 | 763 | */ |
bd4c625c | 764 | int reiserfs_removexattr(struct dentry *dentry, const char *name) |
1da177e4 | 765 | { |
48b32a35 | 766 | struct xattr_handler *handler; |
431547b3 | 767 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
1da177e4 | 768 | |
431547b3 | 769 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c | 770 | return -EOPNOTSUPP; |
1da177e4 | 771 | |
431547b3 | 772 | return handler->set(dentry, name, NULL, 0, XATTR_REPLACE, handler->flags); |
1da177e4 LT |
773 | } |
774 | ||
48b32a35 JM |
775 | struct listxattr_buf { |
776 | size_t size; | |
777 | size_t pos; | |
778 | char *buf; | |
431547b3 | 779 | struct dentry *dentry; |
1da177e4 LT |
780 | }; |
781 | ||
48b32a35 JM |
782 | static int listxattr_filler(void *buf, const char *name, int namelen, |
783 | loff_t offset, u64 ino, unsigned int d_type) | |
1da177e4 | 784 | { |
48b32a35 JM |
785 | struct listxattr_buf *b = (struct listxattr_buf *)buf; |
786 | size_t size; | |
787 | if (name[0] != '.' || | |
788 | (namelen != 1 && (name[1] != '.' || namelen != 2))) { | |
789 | struct xattr_handler *handler; | |
431547b3 | 790 | handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr, |
48b32a35 JM |
791 | name); |
792 | if (!handler) /* Unsupported xattr name */ | |
793 | return 0; | |
794 | if (b->buf) { | |
431547b3 CH |
795 | size = handler->list(b->dentry, b->buf + b->pos, |
796 | b->size, name, namelen, | |
797 | handler->flags); | |
48b32a35 JM |
798 | if (size > b->size) |
799 | return -ERANGE; | |
800 | } else { | |
431547b3 CH |
801 | size = handler->list(b->dentry, NULL, 0, name, |
802 | namelen, handler->flags); | |
bd4c625c | 803 | } |
bd4c625c | 804 | |
48b32a35 JM |
805 | b->pos += size; |
806 | } | |
bd4c625c | 807 | return 0; |
1da177e4 | 808 | } |
bd4c625c | 809 | |
1da177e4 LT |
810 | /* |
811 | * Inode operation listxattr() | |
812 | * | |
48b32a35 JM |
813 | * We totally ignore the generic listxattr here because it would be stupid |
814 | * not to. Since the xattrs are organized in a directory, we can just | |
815 | * readdir to find them. | |
1da177e4 | 816 | */ |
bd4c625c | 817 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
1da177e4 | 818 | { |
bd4c625c LT |
819 | struct dentry *dir; |
820 | int err = 0; | |
a41f1a47 | 821 | loff_t pos = 0; |
48b32a35 | 822 | struct listxattr_buf buf = { |
431547b3 | 823 | .dentry = dentry, |
48b32a35 JM |
824 | .buf = buffer, |
825 | .size = buffer ? size : 0, | |
826 | }; | |
bd4c625c LT |
827 | |
828 | if (!dentry->d_inode) | |
829 | return -EINVAL; | |
830 | ||
677c9b2e | 831 | if (!dentry->d_sb->s_xattr || |
bd4c625c LT |
832 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
833 | return -EOPNOTSUPP; | |
834 | ||
6c17675e | 835 | dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE); |
bd4c625c LT |
836 | if (IS_ERR(dir)) { |
837 | err = PTR_ERR(dir); | |
838 | if (err == -ENODATA) | |
48b32a35 | 839 | err = 0; /* Not an error if there aren't any xattrs */ |
bd4c625c LT |
840 | goto out; |
841 | } | |
842 | ||
6c17675e | 843 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
a41f1a47 | 844 | err = reiserfs_readdir_dentry(dir, &buf, listxattr_filler, &pos); |
6c17675e | 845 | mutex_unlock(&dir->d_inode->i_mutex); |
bd4c625c | 846 | |
48b32a35 JM |
847 | if (!err) |
848 | err = buf.pos; | |
bd4c625c | 849 | |
3227e14c | 850 | dput(dir); |
8b6dd72a | 851 | out: |
bd4c625c | 852 | return err; |
1da177e4 LT |
853 | } |
854 | ||
a72bdb1c | 855 | static int reiserfs_check_acl(struct inode *inode, int mask) |
1da177e4 | 856 | { |
a72bdb1c JM |
857 | struct posix_acl *acl; |
858 | int error = -EAGAIN; /* do regular unix permission checks by default */ | |
bd4c625c | 859 | |
a72bdb1c JM |
860 | acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS); |
861 | ||
a72bdb1c JM |
862 | if (acl) { |
863 | if (!IS_ERR(acl)) { | |
864 | error = posix_acl_permission(inode, acl, mask); | |
865 | posix_acl_release(acl); | |
866 | } else if (PTR_ERR(acl) != -ENODATA) | |
867 | error = PTR_ERR(acl); | |
bd4c625c LT |
868 | } |
869 | ||
a72bdb1c | 870 | return error; |
1da177e4 LT |
871 | } |
872 | ||
a72bdb1c | 873 | static int create_privroot(struct dentry *dentry) |
1da177e4 | 874 | { |
a72bdb1c JM |
875 | int err; |
876 | struct inode *inode = dentry->d_parent->d_inode; | |
5a6059c3 JM |
877 | WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex)); |
878 | ||
6c17675e | 879 | err = xattr_mkdir(inode, dentry, 0700); |
edcc37a0 AV |
880 | if (err || !dentry->d_inode) { |
881 | reiserfs_warning(dentry->d_sb, "jdm-20006", | |
882 | "xattrs/ACLs enabled and couldn't " | |
883 | "find/create .reiserfs_priv. " | |
884 | "Failing mount."); | |
885 | return -EOPNOTSUPP; | |
bd4c625c LT |
886 | } |
887 | ||
edcc37a0 AV |
888 | dentry->d_inode->i_flags |= S_PRIVATE; |
889 | reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr " | |
890 | "storage.\n", PRIVROOT_NAME); | |
bd4c625c | 891 | |
edcc37a0 | 892 | return 0; |
1da177e4 LT |
893 | } |
894 | ||
12abb35a JM |
895 | #else |
896 | int __init reiserfs_xattr_register_handlers(void) { return 0; } | |
897 | void reiserfs_xattr_unregister_handlers(void) {} | |
898 | static int create_privroot(struct dentry *dentry) { return 0; } | |
899 | #endif | |
900 | ||
901 | /* Actual operations that are exported to VFS-land */ | |
902 | struct xattr_handler *reiserfs_xattr_handlers[] = { | |
903 | #ifdef CONFIG_REISERFS_FS_XATTR | |
904 | &reiserfs_xattr_user_handler, | |
905 | &reiserfs_xattr_trusted_handler, | |
906 | #endif | |
907 | #ifdef CONFIG_REISERFS_FS_SECURITY | |
908 | &reiserfs_xattr_security_handler, | |
909 | #endif | |
910 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL | |
911 | &reiserfs_posix_acl_access_handler, | |
912 | &reiserfs_posix_acl_default_handler, | |
913 | #endif | |
914 | NULL | |
915 | }; | |
916 | ||
a72bdb1c | 917 | static int xattr_mount_check(struct super_block *s) |
1da177e4 | 918 | { |
a72bdb1c JM |
919 | /* We need generation numbers to ensure that the oid mapping is correct |
920 | * v3.5 filesystems don't have them. */ | |
48b32a35 JM |
921 | if (old_format_only(s)) { |
922 | if (reiserfs_xattrs_optional(s)) { | |
923 | /* Old format filesystem, but optional xattrs have | |
924 | * been enabled. Error out. */ | |
925 | reiserfs_warning(s, "jdm-2005", | |
926 | "xattrs/ACLs not supported " | |
927 | "on pre-v3.6 format filesystems. " | |
928 | "Failing mount."); | |
929 | return -EOPNOTSUPP; | |
930 | } | |
a72bdb1c JM |
931 | } |
932 | ||
933 | return 0; | |
1da177e4 LT |
934 | } |
935 | ||
b83674c0 JM |
936 | int reiserfs_permission(struct inode *inode, int mask) |
937 | { | |
938 | /* | |
939 | * We don't do permission checks on the internal objects. | |
940 | * Permissions are determined by the "owning" object. | |
941 | */ | |
942 | if (IS_PRIVATE(inode)) | |
943 | return 0; | |
944 | ||
945 | #ifdef CONFIG_REISERFS_FS_XATTR | |
946 | /* | |
947 | * Stat data v1 doesn't support ACLs. | |
948 | */ | |
949 | if (get_inode_sd_version(inode) != STAT_DATA_V1) | |
950 | return generic_permission(inode, mask, reiserfs_check_acl); | |
951 | #endif | |
952 | return generic_permission(inode, mask, NULL); | |
953 | } | |
954 | ||
1da177e4 LT |
955 | /* This will catch lookups from the fs root to .reiserfs_priv */ |
956 | static int | |
bd4c625c | 957 | xattr_lookup_poison(struct dentry *dentry, struct qstr *q1, struct qstr *name) |
1da177e4 | 958 | { |
bd4c625c | 959 | struct dentry *priv_root = REISERFS_SB(dentry->d_sb)->priv_root; |
edcc37a0 | 960 | if (container_of(q1, struct dentry, d_name) == priv_root) |
bd4c625c | 961 | return -ENOENT; |
edcc37a0 | 962 | if (q1->len == name->len && |
bd4c625c LT |
963 | !memcmp(q1->name, name->name, name->len)) |
964 | return 0; | |
965 | return 1; | |
1da177e4 LT |
966 | } |
967 | ||
e16404ed | 968 | static const struct dentry_operations xattr_lookup_poison_ops = { |
bd4c625c | 969 | .d_compare = xattr_lookup_poison, |
1da177e4 LT |
970 | }; |
971 | ||
edcc37a0 AV |
972 | int reiserfs_lookup_privroot(struct super_block *s) |
973 | { | |
974 | struct dentry *dentry; | |
975 | int err = 0; | |
976 | ||
977 | /* If we don't have the privroot located yet - go find it */ | |
c72e0575 | 978 | reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s); |
edcc37a0 AV |
979 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, |
980 | strlen(PRIVROOT_NAME)); | |
981 | if (!IS_ERR(dentry)) { | |
982 | REISERFS_SB(s)->priv_root = dentry; | |
73422811 JM |
983 | if (!reiserfs_expose_privroot(s)) |
984 | s->s_root->d_op = &xattr_lookup_poison_ops; | |
edcc37a0 AV |
985 | if (dentry->d_inode) |
986 | dentry->d_inode->i_flags |= S_PRIVATE; | |
987 | } else | |
988 | err = PTR_ERR(dentry); | |
989 | mutex_unlock(&s->s_root->d_inode->i_mutex); | |
990 | ||
991 | return err; | |
992 | } | |
993 | ||
1da177e4 LT |
994 | /* We need to take a copy of the mount flags since things like |
995 | * MS_RDONLY don't get set until *after* we're called. | |
996 | * mount_flags != mount_options */ | |
bd4c625c | 997 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
1da177e4 | 998 | { |
bd4c625c | 999 | int err = 0; |
ab17c4f0 | 1000 | struct dentry *privroot = REISERFS_SB(s)->priv_root; |
bd4c625c | 1001 | |
a72bdb1c JM |
1002 | err = xattr_mount_check(s); |
1003 | if (err) | |
bd4c625c | 1004 | goto error; |
bd4c625c | 1005 | |
ab17c4f0 | 1006 | if (!privroot->d_inode && !(mount_flags & MS_RDONLY)) { |
ae635c0b | 1007 | reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s); |
edcc37a0 | 1008 | err = create_privroot(REISERFS_SB(s)->priv_root); |
5a6059c3 | 1009 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
bd4c625c | 1010 | } |
ab17c4f0 JM |
1011 | |
1012 | if (privroot->d_inode) { | |
48b32a35 | 1013 | s->s_xattr = reiserfs_xattr_handlers; |
c72e0575 | 1014 | reiserfs_mutex_lock_safe(&privroot->d_inode->i_mutex, s); |
ab17c4f0 JM |
1015 | if (!REISERFS_SB(s)->xattr_root) { |
1016 | struct dentry *dentry; | |
1017 | dentry = lookup_one_len(XAROOT_NAME, privroot, | |
1018 | strlen(XAROOT_NAME)); | |
1019 | if (!IS_ERR(dentry)) | |
1020 | REISERFS_SB(s)->xattr_root = dentry; | |
1021 | else | |
1022 | err = PTR_ERR(dentry); | |
1023 | } | |
1024 | mutex_unlock(&privroot->d_inode->i_mutex); | |
1025 | } | |
48b32a35 | 1026 | |
a72bdb1c | 1027 | error: |
bd4c625c | 1028 | if (err) { |
bd4c625c LT |
1029 | clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt)); |
1030 | clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt)); | |
1031 | } | |
1032 | ||
1033 | /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */ | |
bd4c625c LT |
1034 | if (reiserfs_posixacl(s)) |
1035 | s->s_flags |= MS_POSIXACL; | |
ab17c4f0 | 1036 | else |
ab17c4f0 | 1037 | s->s_flags &= ~MS_POSIXACL; |
bd4c625c LT |
1038 | |
1039 | return err; | |
1da177e4 | 1040 | } |