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 | ||
f466c6fd | 36 | #include "reiserfs.h" |
16f7e0fe | 37 | #include <linux/capability.h> |
1da177e4 LT |
38 | #include <linux/dcache.h> |
39 | #include <linux/namei.h> | |
40 | #include <linux/errno.h> | |
5a0e3ad6 | 41 | #include <linux/gfp.h> |
1da177e4 LT |
42 | #include <linux/fs.h> |
43 | #include <linux/file.h> | |
44 | #include <linux/pagemap.h> | |
45 | #include <linux/xattr.h> | |
c45ac888 | 46 | #include "xattr.h" |
a3063ab8 | 47 | #include "acl.h" |
1da177e4 | 48 | #include <asm/uaccess.h> |
3277c39f | 49 | #include <net/checksum.h> |
1da177e4 | 50 | #include <linux/stat.h> |
6c17675e | 51 | #include <linux/quotaops.h> |
431547b3 | 52 | #include <linux/security.h> |
1da177e4 | 53 | |
1da177e4 LT |
54 | #define PRIVROOT_NAME ".reiserfs_priv" |
55 | #define XAROOT_NAME "xattrs" | |
56 | ||
1da177e4 | 57 | |
6c17675e JM |
58 | /* Helpers for inode ops. We do this so that we don't have all the VFS |
59 | * overhead and also for proper i_mutex annotation. | |
60 | * dir->i_mutex must be held for all of them. */ | |
3a355cc6 | 61 | #ifdef CONFIG_REISERFS_FS_XATTR |
6c17675e | 62 | static int xattr_create(struct inode *dir, struct dentry *dentry, int mode) |
1da177e4 | 63 | { |
6c17675e | 64 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
ebfc3b49 | 65 | return dir->i_op->create(dir, dentry, mode, true); |
6c17675e | 66 | } |
3a355cc6 | 67 | #endif |
bd4c625c | 68 | |
18bb1db3 | 69 | static int xattr_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
6c17675e JM |
70 | { |
71 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); | |
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)); | |
bd4c625c | 83 | |
4dd85969 FW |
84 | reiserfs_mutex_lock_nested_safe(&dentry->d_inode->i_mutex, |
85 | I_MUTEX_CHILD, dir->i_sb); | |
6c17675e JM |
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)); | |
6c17675e | 98 | |
835d5247 FW |
99 | reiserfs_mutex_lock_nested_safe(&dentry->d_inode->i_mutex, |
100 | I_MUTEX_CHILD, dir->i_sb); | |
6c17675e JM |
101 | error = dir->i_op->rmdir(dir, dentry); |
102 | if (!error) | |
103 | dentry->d_inode->i_flags |= S_DEAD; | |
104 | mutex_unlock(&dentry->d_inode->i_mutex); | |
105 | if (!error) | |
106 | d_delete(dentry); | |
6c17675e JM |
107 | |
108 | return error; | |
109 | } | |
110 | ||
6c17675e JM |
111 | #define xattr_may_create(flags) (!flags || flags & XATTR_CREATE) |
112 | ||
ab17c4f0 | 113 | static struct dentry *open_xa_root(struct super_block *sb, int flags) |
6c17675e | 114 | { |
ab17c4f0 JM |
115 | struct dentry *privroot = REISERFS_SB(sb)->priv_root; |
116 | struct dentry *xaroot; | |
117 | if (!privroot->d_inode) | |
118 | return ERR_PTR(-ENODATA); | |
6c17675e | 119 | |
ab17c4f0 | 120 | mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR); |
6c17675e | 121 | |
ab17c4f0 | 122 | xaroot = dget(REISERFS_SB(sb)->xattr_root); |
ceb5edc4 JM |
123 | if (!xaroot) |
124 | xaroot = ERR_PTR(-ENODATA); | |
125 | else if (!xaroot->d_inode) { | |
ab17c4f0 | 126 | int err = -ENODATA; |
5a6059c3 | 127 | if (xattr_may_create(flags)) |
ab17c4f0 | 128 | err = xattr_mkdir(privroot->d_inode, xaroot, 0700); |
9b7f3755 | 129 | if (err) { |
ab17c4f0 JM |
130 | dput(xaroot); |
131 | xaroot = ERR_PTR(err); | |
9b7f3755 | 132 | } |
bd4c625c | 133 | } |
6c17675e | 134 | |
ab17c4f0 JM |
135 | mutex_unlock(&privroot->d_inode->i_mutex); |
136 | return xaroot; | |
1da177e4 LT |
137 | } |
138 | ||
bd4c625c | 139 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
1da177e4 | 140 | { |
bd4c625c LT |
141 | struct dentry *xaroot, *xadir; |
142 | char namebuf[17]; | |
143 | ||
6c17675e | 144 | xaroot = open_xa_root(inode->i_sb, flags); |
9b7f3755 | 145 | if (IS_ERR(xaroot)) |
bd4c625c | 146 | return xaroot; |
bd4c625c | 147 | |
bd4c625c LT |
148 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
149 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), | |
150 | inode->i_generation); | |
bd4c625c | 151 | |
ab17c4f0 JM |
152 | mutex_lock_nested(&xaroot->d_inode->i_mutex, I_MUTEX_XATTR); |
153 | ||
154 | xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf)); | |
155 | if (!IS_ERR(xadir) && !xadir->d_inode) { | |
156 | int err = -ENODATA; | |
157 | if (xattr_may_create(flags)) | |
158 | err = xattr_mkdir(xaroot->d_inode, xadir, 0700); | |
159 | if (err) { | |
160 | dput(xadir); | |
161 | xadir = ERR_PTR(err); | |
162 | } | |
163 | } | |
164 | ||
165 | mutex_unlock(&xaroot->d_inode->i_mutex); | |
bd4c625c LT |
166 | dput(xaroot); |
167 | return xadir; | |
1da177e4 LT |
168 | } |
169 | ||
48b32a35 JM |
170 | /* The following are side effects of other operations that aren't explicitly |
171 | * modifying extended attributes. This includes operations such as permissions | |
172 | * or ownership changes, object deletions, etc. */ | |
a41f1a47 | 173 | struct reiserfs_dentry_buf { |
4acf381e | 174 | struct dir_context ctx; |
a41f1a47 JM |
175 | struct dentry *xadir; |
176 | int count; | |
177 | struct dentry *dentries[8]; | |
178 | }; | |
bd4c625c | 179 | |
a72bdb1c | 180 | static int |
a41f1a47 JM |
181 | fill_with_dentries(void *buf, const char *name, int namelen, loff_t offset, |
182 | u64 ino, unsigned int d_type) | |
a72bdb1c | 183 | { |
a41f1a47 | 184 | struct reiserfs_dentry_buf *dbuf = buf; |
a72bdb1c | 185 | struct dentry *dentry; |
5a6059c3 | 186 | WARN_ON_ONCE(!mutex_is_locked(&dbuf->xadir->d_inode->i_mutex)); |
bd4c625c | 187 | |
a41f1a47 JM |
188 | if (dbuf->count == ARRAY_SIZE(dbuf->dentries)) |
189 | return -ENOSPC; | |
bd4c625c | 190 | |
35e5cbc0 JK |
191 | if (name[0] == '.' && (namelen < 2 || |
192 | (namelen == 2 && name[1] == '.'))) | |
a41f1a47 | 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; | |
a41f1a47 | 227 | struct reiserfs_dentry_buf buf = { |
4acf381e | 228 | .ctx.actor = fill_with_dentries, |
a41f1a47 | 229 | }; |
1da177e4 | 230 | |
a72bdb1c JM |
231 | /* Skip out, an xattr has no xattrs associated with it */ |
232 | if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1) | |
233 | return 0; | |
1da177e4 | 234 | |
27026a05 | 235 | reiserfs_write_unlock(inode->i_sb); |
6c17675e | 236 | dir = open_xa_dir(inode, XATTR_REPLACE); |
a72bdb1c JM |
237 | if (IS_ERR(dir)) { |
238 | err = PTR_ERR(dir); | |
27026a05 | 239 | reiserfs_write_lock(inode->i_sb); |
a72bdb1c JM |
240 | goto out; |
241 | } else if (!dir->d_inode) { | |
a41f1a47 | 242 | err = 0; |
27026a05 | 243 | reiserfs_write_lock(inode->i_sb); |
a41f1a47 | 244 | goto out_dir; |
a72bdb1c | 245 | } |
1da177e4 | 246 | |
6c17675e | 247 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
27026a05 FW |
248 | |
249 | reiserfs_write_lock(inode->i_sb); | |
250 | ||
a41f1a47 | 251 | buf.xadir = dir; |
cd62cdae AV |
252 | while (1) { |
253 | err = reiserfs_readdir_inode(dir->d_inode, &buf.ctx); | |
254 | if (err) | |
255 | break; | |
256 | if (!buf.count) | |
257 | break; | |
258 | for (i = 0; !err && i < buf.count && buf.dentries[i]; i++) { | |
a41f1a47 | 259 | struct dentry *dentry = buf.dentries[i]; |
1da177e4 | 260 | |
cd62cdae AV |
261 | if (!S_ISDIR(dentry->d_inode->i_mode)) |
262 | err = action(dentry, data); | |
1da177e4 | 263 | |
a41f1a47 JM |
264 | dput(dentry); |
265 | buf.dentries[i] = NULL; | |
bd4c625c | 266 | } |
cd62cdae AV |
267 | if (err) |
268 | break; | |
a41f1a47 | 269 | buf.count = 0; |
8b6dd72a | 270 | } |
a41f1a47 | 271 | mutex_unlock(&dir->d_inode->i_mutex); |
1da177e4 | 272 | |
a41f1a47 | 273 | cleanup_dentry_buf(&buf); |
1da177e4 | 274 | |
d984561b | 275 | if (!err) { |
a41f1a47 JM |
276 | /* We start a transaction here to avoid a ABBA situation |
277 | * between the xattr root's i_mutex and the journal lock. | |
278 | * This doesn't incur much additional overhead since the | |
279 | * new transaction will just nest inside the | |
280 | * outer transaction. */ | |
281 | int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + | |
282 | 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); | |
283 | struct reiserfs_transaction_handle th; | |
284 | err = journal_begin(&th, inode->i_sb, blocks); | |
285 | if (!err) { | |
286 | int jerror; | |
8b513f56 FW |
287 | reiserfs_mutex_lock_nested_safe( |
288 | &dir->d_parent->d_inode->i_mutex, | |
289 | I_MUTEX_XATTR, inode->i_sb); | |
a41f1a47 JM |
290 | err = action(dir, data); |
291 | jerror = journal_end(&th, inode->i_sb, blocks); | |
292 | mutex_unlock(&dir->d_parent->d_inode->i_mutex); | |
293 | err = jerror ?: err; | |
294 | } | |
a72bdb1c | 295 | } |
a41f1a47 JM |
296 | out_dir: |
297 | dput(dir); | |
a72bdb1c | 298 | out: |
a41f1a47 JM |
299 | /* -ENODATA isn't an error */ |
300 | if (err == -ENODATA) | |
301 | err = 0; | |
a72bdb1c JM |
302 | return err; |
303 | } | |
1da177e4 | 304 | |
a41f1a47 | 305 | static int delete_one_xattr(struct dentry *dentry, void *data) |
a72bdb1c | 306 | { |
a41f1a47 | 307 | struct inode *dir = dentry->d_parent->d_inode; |
1da177e4 | 308 | |
a41f1a47 JM |
309 | /* This is the xattr dir, handle specially. */ |
310 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
311 | return xattr_rmdir(dir, dentry); | |
1da177e4 | 312 | |
a41f1a47 JM |
313 | return xattr_unlink(dir, dentry); |
314 | } | |
bd4c625c | 315 | |
a41f1a47 JM |
316 | static int chown_one_xattr(struct dentry *dentry, void *data) |
317 | { | |
318 | struct iattr *attrs = data; | |
4a857011 JM |
319 | int ia_valid = attrs->ia_valid; |
320 | int err; | |
321 | ||
322 | /* | |
323 | * We only want the ownership bits. Otherwise, we'll do | |
324 | * things like change a directory to a regular file if | |
325 | * ATTR_MODE is set. | |
326 | */ | |
327 | attrs->ia_valid &= (ATTR_UID|ATTR_GID); | |
328 | err = reiserfs_setattr(dentry, attrs); | |
329 | attrs->ia_valid = ia_valid; | |
330 | ||
331 | return err; | |
a41f1a47 | 332 | } |
1da177e4 | 333 | |
a41f1a47 JM |
334 | /* No i_mutex, but the inode is unconnected. */ |
335 | int reiserfs_delete_xattrs(struct inode *inode) | |
336 | { | |
337 | int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); | |
338 | if (err) | |
339 | reiserfs_warning(inode->i_sb, "jdm-20004", | |
340 | "Couldn't delete all xattrs (%d)\n", err); | |
a72bdb1c JM |
341 | return err; |
342 | } | |
1da177e4 | 343 | |
a41f1a47 | 344 | /* inode->i_mutex: down */ |
a72bdb1c JM |
345 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
346 | { | |
a41f1a47 | 347 | int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); |
8b6dd72a JM |
348 | if (err) |
349 | reiserfs_warning(inode->i_sb, "jdm-20007", | |
350 | "Couldn't chown all xattrs (%d)\n", err); | |
a72bdb1c | 351 | return err; |
1da177e4 LT |
352 | } |
353 | ||
a72bdb1c | 354 | #ifdef CONFIG_REISERFS_FS_XATTR |
a72bdb1c JM |
355 | /* Returns a dentry corresponding to a specific extended attribute file |
356 | * for the inode. If flags allow, the file is created. Otherwise, a | |
357 | * valid or negative dentry, or an error is returned. */ | |
48b32a35 JM |
358 | static struct dentry *xattr_lookup(struct inode *inode, const char *name, |
359 | int flags) | |
1da177e4 | 360 | { |
a72bdb1c JM |
361 | struct dentry *xadir, *xafile; |
362 | int err = 0; | |
363 | ||
364 | xadir = open_xa_dir(inode, flags); | |
6c17675e | 365 | if (IS_ERR(xadir)) |
a72bdb1c | 366 | return ERR_CAST(xadir); |
a72bdb1c | 367 | |
5a6059c3 | 368 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
a72bdb1c JM |
369 | xafile = lookup_one_len(name, xadir, strlen(name)); |
370 | if (IS_ERR(xafile)) { | |
6c17675e JM |
371 | err = PTR_ERR(xafile); |
372 | goto out; | |
bd4c625c | 373 | } |
a72bdb1c | 374 | |
6c17675e JM |
375 | if (xafile->d_inode && (flags & XATTR_CREATE)) |
376 | err = -EEXIST; | |
a72bdb1c | 377 | |
6c17675e JM |
378 | if (!xafile->d_inode) { |
379 | err = -ENODATA; | |
5a6059c3 | 380 | if (xattr_may_create(flags)) |
6c17675e JM |
381 | err = xattr_create(xadir->d_inode, xafile, |
382 | 0700|S_IFREG); | |
a72bdb1c JM |
383 | } |
384 | ||
6c17675e JM |
385 | if (err) |
386 | dput(xafile); | |
a72bdb1c | 387 | out: |
5a6059c3 | 388 | mutex_unlock(&xadir->d_inode->i_mutex); |
a72bdb1c JM |
389 | dput(xadir); |
390 | if (err) | |
6c17675e | 391 | return ERR_PTR(err); |
a72bdb1c | 392 | return xafile; |
1da177e4 LT |
393 | } |
394 | ||
1da177e4 | 395 | /* Internal operations on file data */ |
bd4c625c | 396 | static inline void reiserfs_put_page(struct page *page) |
1da177e4 | 397 | { |
bd4c625c LT |
398 | kunmap(page); |
399 | page_cache_release(page); | |
1da177e4 LT |
400 | } |
401 | ||
ec6ea56b | 402 | static struct page *reiserfs_get_page(struct inode *dir, size_t n) |
1da177e4 | 403 | { |
bd4c625c LT |
404 | struct address_space *mapping = dir->i_mapping; |
405 | struct page *page; | |
406 | /* We can deadlock if we try to free dentries, | |
25985edc | 407 | and an unlink/rmdir has just occurred - GFP_NOFS avoids this */ |
c4cdd038 | 408 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
ec6ea56b | 409 | page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL); |
bd4c625c | 410 | if (!IS_ERR(page)) { |
bd4c625c | 411 | kmap(page); |
bd4c625c LT |
412 | if (PageError(page)) |
413 | goto fail; | |
414 | } | |
415 | return page; | |
416 | ||
417 | fail: | |
418 | reiserfs_put_page(page); | |
419 | return ERR_PTR(-EIO); | |
1da177e4 LT |
420 | } |
421 | ||
bd4c625c | 422 | static inline __u32 xattr_hash(const char *msg, int len) |
1da177e4 | 423 | { |
bd4c625c | 424 | return csum_partial(msg, len, 0); |
1da177e4 LT |
425 | } |
426 | ||
ba9d8cec VS |
427 | int reiserfs_commit_write(struct file *f, struct page *page, |
428 | unsigned from, unsigned to); | |
ba9d8cec | 429 | |
48b32a35 JM |
430 | static void update_ctime(struct inode *inode) |
431 | { | |
432 | struct timespec now = current_fs_time(inode->i_sb); | |
1d3382cb | 433 | if (inode_unhashed(inode) || !inode->i_nlink || |
48b32a35 JM |
434 | timespec_equal(&inode->i_ctime, &now)) |
435 | return; | |
436 | ||
437 | inode->i_ctime = CURRENT_TIME_SEC; | |
438 | mark_inode_dirty(inode); | |
439 | } | |
440 | ||
441 | static int lookup_and_delete_xattr(struct inode *inode, const char *name) | |
442 | { | |
443 | int err = 0; | |
444 | struct dentry *dentry, *xadir; | |
445 | ||
446 | xadir = open_xa_dir(inode, XATTR_REPLACE); | |
447 | if (IS_ERR(xadir)) | |
448 | return PTR_ERR(xadir); | |
449 | ||
5a6059c3 | 450 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
48b32a35 JM |
451 | dentry = lookup_one_len(name, xadir, strlen(name)); |
452 | if (IS_ERR(dentry)) { | |
453 | err = PTR_ERR(dentry); | |
454 | goto out_dput; | |
455 | } | |
456 | ||
457 | if (dentry->d_inode) { | |
4f3be1b5 | 458 | reiserfs_write_lock(inode->i_sb); |
48b32a35 | 459 | err = xattr_unlink(xadir->d_inode, dentry); |
4f3be1b5 | 460 | reiserfs_write_unlock(inode->i_sb); |
48b32a35 JM |
461 | update_ctime(inode); |
462 | } | |
463 | ||
464 | dput(dentry); | |
465 | out_dput: | |
5a6059c3 | 466 | mutex_unlock(&xadir->d_inode->i_mutex); |
48b32a35 JM |
467 | dput(xadir); |
468 | return err; | |
469 | } | |
470 | ||
ba9d8cec | 471 | |
1da177e4 LT |
472 | /* Generic extended attribute operations that can be used by xa plugins */ |
473 | ||
474 | /* | |
1b1dcc1b | 475 | * inode->i_mutex: down |
1da177e4 LT |
476 | */ |
477 | int | |
0ab2621e JM |
478 | reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, |
479 | struct inode *inode, const char *name, | |
480 | const void *buffer, size_t buffer_size, int flags) | |
1da177e4 | 481 | { |
bd4c625c | 482 | int err = 0; |
3227e14c | 483 | struct dentry *dentry; |
bd4c625c LT |
484 | struct page *page; |
485 | char *data; | |
bd4c625c LT |
486 | size_t file_pos = 0; |
487 | size_t buffer_pos = 0; | |
48b32a35 | 488 | size_t new_size; |
bd4c625c LT |
489 | __u32 xahash = 0; |
490 | ||
bd4c625c LT |
491 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
492 | return -EOPNOTSUPP; | |
493 | ||
3f14fea6 | 494 | reiserfs_write_unlock(inode->i_sb); |
4f3be1b5 FW |
495 | |
496 | if (!buffer) { | |
497 | err = lookup_and_delete_xattr(inode, name); | |
498 | reiserfs_write_lock(inode->i_sb); | |
499 | return err; | |
500 | } | |
501 | ||
48b32a35 | 502 | dentry = xattr_lookup(inode, name, flags); |
3f14fea6 FW |
503 | if (IS_ERR(dentry)) { |
504 | reiserfs_write_lock(inode->i_sb); | |
48b32a35 | 505 | return PTR_ERR(dentry); |
3f14fea6 FW |
506 | } |
507 | ||
f3e22f48 | 508 | down_write(&REISERFS_I(inode)->i_xattr_sem); |
bd4c625c | 509 | |
3f14fea6 | 510 | reiserfs_write_lock(inode->i_sb); |
bd4c625c | 511 | |
8b6dd72a | 512 | xahash = xattr_hash(buffer, buffer_size); |
bd4c625c LT |
513 | while (buffer_pos < buffer_size || buffer_pos == 0) { |
514 | size_t chunk; | |
515 | size_t skip = 0; | |
516 | size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1)); | |
517 | if (buffer_size - buffer_pos > PAGE_CACHE_SIZE) | |
518 | chunk = PAGE_CACHE_SIZE; | |
519 | else | |
520 | chunk = buffer_size - buffer_pos; | |
521 | ||
ec6ea56b | 522 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
523 | if (IS_ERR(page)) { |
524 | err = PTR_ERR(page); | |
48b32a35 | 525 | goto out_unlock; |
bd4c625c LT |
526 | } |
527 | ||
528 | lock_page(page); | |
529 | data = page_address(page); | |
530 | ||
531 | if (file_pos == 0) { | |
532 | struct reiserfs_xattr_header *rxh; | |
533 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
534 | if (chunk + skip > PAGE_CACHE_SIZE) | |
535 | chunk = PAGE_CACHE_SIZE - skip; | |
536 | rxh = (struct reiserfs_xattr_header *)data; | |
537 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); | |
538 | rxh->h_hash = cpu_to_le32(xahash); | |
539 | } | |
540 | ||
ebdec241 | 541 | err = __reiserfs_write_begin(page, page_offset, chunk + skip); |
bd4c625c LT |
542 | if (!err) { |
543 | if (buffer) | |
544 | memcpy(data + skip, buffer + buffer_pos, chunk); | |
3227e14c JM |
545 | err = reiserfs_commit_write(NULL, page, page_offset, |
546 | page_offset + chunk + | |
547 | skip); | |
bd4c625c LT |
548 | } |
549 | unlock_page(page); | |
550 | reiserfs_put_page(page); | |
551 | buffer_pos += chunk; | |
552 | file_pos += chunk; | |
553 | skip = 0; | |
554 | if (err || buffer_size == 0 || !buffer) | |
555 | break; | |
556 | } | |
557 | ||
48b32a35 JM |
558 | new_size = buffer_size + sizeof(struct reiserfs_xattr_header); |
559 | if (!err && new_size < i_size_read(dentry->d_inode)) { | |
560 | struct iattr newattrs = { | |
561 | .ia_ctime = current_fs_time(inode->i_sb), | |
fb2162df | 562 | .ia_size = new_size, |
48b32a35 JM |
563 | .ia_valid = ATTR_SIZE | ATTR_CTIME, |
564 | }; | |
31370f62 FW |
565 | |
566 | reiserfs_write_unlock(inode->i_sb); | |
48b32a35 | 567 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR); |
bd5fe6c5 | 568 | inode_dio_wait(dentry->d_inode); |
31370f62 FW |
569 | reiserfs_write_lock(inode->i_sb); |
570 | ||
48b32a35 | 571 | err = reiserfs_setattr(dentry, &newattrs); |
48b32a35 JM |
572 | mutex_unlock(&dentry->d_inode->i_mutex); |
573 | } else | |
574 | update_ctime(inode); | |
575 | out_unlock: | |
8b6dd72a | 576 | up_write(&REISERFS_I(inode)->i_xattr_sem); |
3227e14c | 577 | dput(dentry); |
48b32a35 JM |
578 | return err; |
579 | } | |
bd4c625c | 580 | |
0ab2621e JM |
581 | /* We need to start a transaction to maintain lock ordering */ |
582 | int reiserfs_xattr_set(struct inode *inode, const char *name, | |
583 | const void *buffer, size_t buffer_size, int flags) | |
48b32a35 | 584 | { |
0ab2621e JM |
585 | |
586 | struct reiserfs_transaction_handle th; | |
587 | int error, error2; | |
588 | size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size); | |
589 | ||
590 | if (!(flags & XATTR_REPLACE)) | |
591 | jbegin_count += reiserfs_xattr_jcreate_nblocks(inode); | |
592 | ||
593 | reiserfs_write_lock(inode->i_sb); | |
594 | error = journal_begin(&th, inode->i_sb, jbegin_count); | |
595 | if (error) { | |
596 | reiserfs_write_unlock(inode->i_sb); | |
597 | return error; | |
1da177e4 | 598 | } |
bd4c625c | 599 | |
0ab2621e JM |
600 | error = reiserfs_xattr_set_handle(&th, inode, name, |
601 | buffer, buffer_size, flags); | |
bd4c625c | 602 | |
0ab2621e JM |
603 | error2 = journal_end(&th, inode->i_sb, jbegin_count); |
604 | if (error == 0) | |
605 | error = error2; | |
606 | reiserfs_write_unlock(inode->i_sb); | |
607 | ||
608 | return error; | |
1da177e4 LT |
609 | } |
610 | ||
611 | /* | |
1b1dcc1b | 612 | * inode->i_mutex: down |
1da177e4 LT |
613 | */ |
614 | int | |
48b32a35 | 615 | reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, |
bd4c625c | 616 | size_t buffer_size) |
1da177e4 | 617 | { |
bd4c625c | 618 | ssize_t err = 0; |
3227e14c | 619 | struct dentry *dentry; |
bd4c625c LT |
620 | size_t isize; |
621 | size_t file_pos = 0; | |
622 | size_t buffer_pos = 0; | |
623 | struct page *page; | |
bd4c625c LT |
624 | __u32 hash = 0; |
625 | ||
626 | if (name == NULL) | |
627 | return -EINVAL; | |
628 | ||
629 | /* We can't have xattrs attached to v1 items since they don't have | |
630 | * generation numbers */ | |
631 | if (get_inode_sd_version(inode) == STAT_DATA_V1) | |
632 | return -EOPNOTSUPP; | |
633 | ||
48b32a35 | 634 | dentry = xattr_lookup(inode, name, XATTR_REPLACE); |
3227e14c JM |
635 | if (IS_ERR(dentry)) { |
636 | err = PTR_ERR(dentry); | |
bd4c625c LT |
637 | goto out; |
638 | } | |
639 | ||
8b6dd72a | 640 | down_read(&REISERFS_I(inode)->i_xattr_sem); |
d984561b | 641 | |
f437c529 | 642 | isize = i_size_read(dentry->d_inode); |
bd4c625c LT |
643 | |
644 | /* Just return the size needed */ | |
645 | if (buffer == NULL) { | |
646 | err = isize - sizeof(struct reiserfs_xattr_header); | |
8b6dd72a | 647 | goto out_unlock; |
bd4c625c LT |
648 | } |
649 | ||
650 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { | |
651 | err = -ERANGE; | |
8b6dd72a | 652 | goto out_unlock; |
bd4c625c LT |
653 | } |
654 | ||
655 | while (file_pos < isize) { | |
656 | size_t chunk; | |
657 | char *data; | |
658 | size_t skip = 0; | |
659 | if (isize - file_pos > PAGE_CACHE_SIZE) | |
660 | chunk = PAGE_CACHE_SIZE; | |
661 | else | |
662 | chunk = isize - file_pos; | |
663 | ||
a72bdb1c | 664 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
665 | if (IS_ERR(page)) { |
666 | err = PTR_ERR(page); | |
8b6dd72a | 667 | goto out_unlock; |
bd4c625c LT |
668 | } |
669 | ||
670 | lock_page(page); | |
671 | data = page_address(page); | |
672 | if (file_pos == 0) { | |
673 | struct reiserfs_xattr_header *rxh = | |
674 | (struct reiserfs_xattr_header *)data; | |
675 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
676 | chunk -= skip; | |
677 | /* Magic doesn't match up.. */ | |
678 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { | |
679 | unlock_page(page); | |
680 | reiserfs_put_page(page); | |
a72bdb1c | 681 | reiserfs_warning(inode->i_sb, "jdm-20001", |
bd4c625c LT |
682 | "Invalid magic for xattr (%s) " |
683 | "associated with %k", name, | |
684 | INODE_PKEY(inode)); | |
685 | err = -EIO; | |
8b6dd72a | 686 | goto out_unlock; |
bd4c625c LT |
687 | } |
688 | hash = le32_to_cpu(rxh->h_hash); | |
689 | } | |
690 | memcpy(buffer + buffer_pos, data + skip, chunk); | |
691 | unlock_page(page); | |
692 | reiserfs_put_page(page); | |
693 | file_pos += chunk; | |
694 | buffer_pos += chunk; | |
695 | skip = 0; | |
696 | } | |
697 | err = isize - sizeof(struct reiserfs_xattr_header); | |
698 | ||
699 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != | |
700 | hash) { | |
a72bdb1c | 701 | reiserfs_warning(inode->i_sb, "jdm-20002", |
bd4c625c LT |
702 | "Invalid hash for xattr (%s) associated " |
703 | "with %k", name, INODE_PKEY(inode)); | |
704 | err = -EIO; | |
705 | } | |
706 | ||
8b6dd72a JM |
707 | out_unlock: |
708 | up_read(&REISERFS_I(inode)->i_xattr_sem); | |
3227e14c | 709 | dput(dentry); |
bd4c625c | 710 | |
a72bdb1c | 711 | out: |
bd4c625c | 712 | return err; |
1da177e4 LT |
713 | } |
714 | ||
48b32a35 JM |
715 | /* |
716 | * In order to implement different sets of xattr operations for each xattr | |
717 | * prefix with the generic xattr API, a filesystem should create a | |
718 | * null-terminated array of struct xattr_handler (one for each prefix) and | |
719 | * hang a pointer to it off of the s_xattr field of the superblock. | |
720 | * | |
721 | * The generic_fooxattr() functions will use this list to dispatch xattr | |
722 | * operations to the correct xattr_handler. | |
723 | */ | |
724 | #define for_each_xattr_handler(handlers, handler) \ | |
725 | for ((handler) = *(handlers)++; \ | |
726 | (handler) != NULL; \ | |
727 | (handler) = *(handlers)++) | |
1da177e4 | 728 | |
48b32a35 | 729 | /* This is the implementation for the xattr plugin infrastructure */ |
94d09a98 SH |
730 | static inline const struct xattr_handler * |
731 | find_xattr_handler_prefix(const struct xattr_handler **handlers, | |
48b32a35 | 732 | const char *name) |
1da177e4 | 733 | { |
94d09a98 | 734 | const struct xattr_handler *xah; |
bd4c625c | 735 | |
48b32a35 JM |
736 | if (!handlers) |
737 | return NULL; | |
bd4c625c | 738 | |
48b32a35 JM |
739 | for_each_xattr_handler(handlers, xah) { |
740 | if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0) | |
741 | break; | |
bd4c625c LT |
742 | } |
743 | ||
48b32a35 | 744 | return xah; |
bd4c625c | 745 | } |
1da177e4 | 746 | |
1da177e4 LT |
747 | |
748 | /* | |
749 | * Inode operation getxattr() | |
1da177e4 LT |
750 | */ |
751 | ssize_t | |
bd4c625c LT |
752 | reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, |
753 | size_t size) | |
1da177e4 | 754 | { |
94d09a98 | 755 | const struct xattr_handler *handler; |
bd4c625c | 756 | |
431547b3 | 757 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 758 | |
431547b3 | 759 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c LT |
760 | return -EOPNOTSUPP; |
761 | ||
431547b3 | 762 | return handler->get(dentry, name, buffer, size, handler->flags); |
1da177e4 LT |
763 | } |
764 | ||
1da177e4 LT |
765 | /* |
766 | * Inode operation setxattr() | |
767 | * | |
1b1dcc1b | 768 | * dentry->d_inode->i_mutex down |
1da177e4 LT |
769 | */ |
770 | int | |
bd4c625c LT |
771 | reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
772 | size_t size, int flags) | |
1da177e4 | 773 | { |
94d09a98 | 774 | const struct xattr_handler *handler; |
bd4c625c | 775 | |
431547b3 | 776 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 777 | |
431547b3 | 778 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c LT |
779 | return -EOPNOTSUPP; |
780 | ||
431547b3 | 781 | return handler->set(dentry, name, value, size, flags, handler->flags); |
1da177e4 LT |
782 | } |
783 | ||
784 | /* | |
785 | * Inode operation removexattr() | |
786 | * | |
1b1dcc1b | 787 | * dentry->d_inode->i_mutex down |
1da177e4 | 788 | */ |
bd4c625c | 789 | int reiserfs_removexattr(struct dentry *dentry, const char *name) |
1da177e4 | 790 | { |
94d09a98 | 791 | const struct xattr_handler *handler; |
431547b3 | 792 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
1da177e4 | 793 | |
431547b3 | 794 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c | 795 | return -EOPNOTSUPP; |
1da177e4 | 796 | |
431547b3 | 797 | return handler->set(dentry, name, NULL, 0, XATTR_REPLACE, handler->flags); |
1da177e4 LT |
798 | } |
799 | ||
48b32a35 | 800 | struct listxattr_buf { |
4acf381e | 801 | struct dir_context ctx; |
48b32a35 JM |
802 | size_t size; |
803 | size_t pos; | |
804 | char *buf; | |
431547b3 | 805 | struct dentry *dentry; |
1da177e4 LT |
806 | }; |
807 | ||
48b32a35 JM |
808 | static int listxattr_filler(void *buf, const char *name, int namelen, |
809 | loff_t offset, u64 ino, unsigned int d_type) | |
1da177e4 | 810 | { |
48b32a35 JM |
811 | struct listxattr_buf *b = (struct listxattr_buf *)buf; |
812 | size_t size; | |
813 | if (name[0] != '.' || | |
814 | (namelen != 1 && (name[1] != '.' || namelen != 2))) { | |
94d09a98 | 815 | const struct xattr_handler *handler; |
431547b3 | 816 | handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr, |
48b32a35 JM |
817 | name); |
818 | if (!handler) /* Unsupported xattr name */ | |
819 | return 0; | |
820 | if (b->buf) { | |
431547b3 CH |
821 | size = handler->list(b->dentry, b->buf + b->pos, |
822 | b->size, name, namelen, | |
823 | handler->flags); | |
48b32a35 JM |
824 | if (size > b->size) |
825 | return -ERANGE; | |
826 | } else { | |
431547b3 CH |
827 | size = handler->list(b->dentry, NULL, 0, name, |
828 | namelen, handler->flags); | |
bd4c625c | 829 | } |
bd4c625c | 830 | |
48b32a35 JM |
831 | b->pos += size; |
832 | } | |
bd4c625c | 833 | return 0; |
1da177e4 | 834 | } |
bd4c625c | 835 | |
1da177e4 LT |
836 | /* |
837 | * Inode operation listxattr() | |
838 | * | |
48b32a35 JM |
839 | * We totally ignore the generic listxattr here because it would be stupid |
840 | * not to. Since the xattrs are organized in a directory, we can just | |
841 | * readdir to find them. | |
1da177e4 | 842 | */ |
bd4c625c | 843 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
1da177e4 | 844 | { |
bd4c625c LT |
845 | struct dentry *dir; |
846 | int err = 0; | |
48b32a35 | 847 | struct listxattr_buf buf = { |
4acf381e | 848 | .ctx.actor = listxattr_filler, |
431547b3 | 849 | .dentry = dentry, |
48b32a35 JM |
850 | .buf = buffer, |
851 | .size = buffer ? size : 0, | |
852 | }; | |
bd4c625c LT |
853 | |
854 | if (!dentry->d_inode) | |
855 | return -EINVAL; | |
856 | ||
677c9b2e | 857 | if (!dentry->d_sb->s_xattr || |
bd4c625c LT |
858 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
859 | return -EOPNOTSUPP; | |
860 | ||
6c17675e | 861 | dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE); |
bd4c625c LT |
862 | if (IS_ERR(dir)) { |
863 | err = PTR_ERR(dir); | |
864 | if (err == -ENODATA) | |
48b32a35 | 865 | err = 0; /* Not an error if there aren't any xattrs */ |
bd4c625c LT |
866 | goto out; |
867 | } | |
868 | ||
6c17675e | 869 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
cd62cdae | 870 | err = reiserfs_readdir_inode(dir->d_inode, &buf.ctx); |
6c17675e | 871 | mutex_unlock(&dir->d_inode->i_mutex); |
bd4c625c | 872 | |
48b32a35 JM |
873 | if (!err) |
874 | err = buf.pos; | |
bd4c625c | 875 | |
3227e14c | 876 | dput(dir); |
8b6dd72a | 877 | out: |
bd4c625c | 878 | return err; |
1da177e4 LT |
879 | } |
880 | ||
a72bdb1c | 881 | static int create_privroot(struct dentry *dentry) |
1da177e4 | 882 | { |
a72bdb1c JM |
883 | int err; |
884 | struct inode *inode = dentry->d_parent->d_inode; | |
5a6059c3 JM |
885 | WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex)); |
886 | ||
6c17675e | 887 | err = xattr_mkdir(inode, dentry, 0700); |
edcc37a0 AV |
888 | if (err || !dentry->d_inode) { |
889 | reiserfs_warning(dentry->d_sb, "jdm-20006", | |
890 | "xattrs/ACLs enabled and couldn't " | |
891 | "find/create .reiserfs_priv. " | |
892 | "Failing mount."); | |
893 | return -EOPNOTSUPP; | |
bd4c625c LT |
894 | } |
895 | ||
edcc37a0 AV |
896 | dentry->d_inode->i_flags |= S_PRIVATE; |
897 | reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr " | |
898 | "storage.\n", PRIVROOT_NAME); | |
bd4c625c | 899 | |
edcc37a0 | 900 | return 0; |
1da177e4 LT |
901 | } |
902 | ||
12abb35a JM |
903 | #else |
904 | int __init reiserfs_xattr_register_handlers(void) { return 0; } | |
905 | void reiserfs_xattr_unregister_handlers(void) {} | |
906 | static int create_privroot(struct dentry *dentry) { return 0; } | |
907 | #endif | |
908 | ||
909 | /* Actual operations that are exported to VFS-land */ | |
da02eb72 | 910 | static const struct xattr_handler *reiserfs_xattr_handlers[] = { |
12abb35a JM |
911 | #ifdef CONFIG_REISERFS_FS_XATTR |
912 | &reiserfs_xattr_user_handler, | |
913 | &reiserfs_xattr_trusted_handler, | |
914 | #endif | |
915 | #ifdef CONFIG_REISERFS_FS_SECURITY | |
916 | &reiserfs_xattr_security_handler, | |
917 | #endif | |
918 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL | |
919 | &reiserfs_posix_acl_access_handler, | |
920 | &reiserfs_posix_acl_default_handler, | |
921 | #endif | |
922 | NULL | |
923 | }; | |
924 | ||
a72bdb1c | 925 | static int xattr_mount_check(struct super_block *s) |
1da177e4 | 926 | { |
a72bdb1c JM |
927 | /* We need generation numbers to ensure that the oid mapping is correct |
928 | * v3.5 filesystems don't have them. */ | |
48b32a35 JM |
929 | if (old_format_only(s)) { |
930 | if (reiserfs_xattrs_optional(s)) { | |
931 | /* Old format filesystem, but optional xattrs have | |
932 | * been enabled. Error out. */ | |
933 | reiserfs_warning(s, "jdm-2005", | |
934 | "xattrs/ACLs not supported " | |
935 | "on pre-v3.6 format filesystems. " | |
936 | "Failing mount."); | |
937 | return -EOPNOTSUPP; | |
938 | } | |
a72bdb1c JM |
939 | } |
940 | ||
941 | return 0; | |
1da177e4 LT |
942 | } |
943 | ||
10556cb2 | 944 | int reiserfs_permission(struct inode *inode, int mask) |
b83674c0 JM |
945 | { |
946 | /* | |
947 | * We don't do permission checks on the internal objects. | |
948 | * Permissions are determined by the "owning" object. | |
949 | */ | |
950 | if (IS_PRIVATE(inode)) | |
951 | return 0; | |
952 | ||
2830ba7f | 953 | return generic_permission(inode, mask); |
b83674c0 JM |
954 | } |
955 | ||
0b728e19 | 956 | static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 957 | { |
cac36f70 | 958 | return -EPERM; |
1da177e4 LT |
959 | } |
960 | ||
e16404ed | 961 | static const struct dentry_operations xattr_lookup_poison_ops = { |
cac36f70 | 962 | .d_revalidate = xattr_hide_revalidate, |
1da177e4 LT |
963 | }; |
964 | ||
edcc37a0 AV |
965 | int reiserfs_lookup_privroot(struct super_block *s) |
966 | { | |
967 | struct dentry *dentry; | |
968 | int err = 0; | |
969 | ||
970 | /* If we don't have the privroot located yet - go find it */ | |
c72e0575 | 971 | reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s); |
edcc37a0 AV |
972 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, |
973 | strlen(PRIVROOT_NAME)); | |
974 | if (!IS_ERR(dentry)) { | |
975 | REISERFS_SB(s)->priv_root = dentry; | |
fb045adb | 976 | d_set_d_op(dentry, &xattr_lookup_poison_ops); |
edcc37a0 AV |
977 | if (dentry->d_inode) |
978 | dentry->d_inode->i_flags |= S_PRIVATE; | |
979 | } else | |
980 | err = PTR_ERR(dentry); | |
981 | mutex_unlock(&s->s_root->d_inode->i_mutex); | |
982 | ||
983 | return err; | |
984 | } | |
985 | ||
1da177e4 LT |
986 | /* We need to take a copy of the mount flags since things like |
987 | * MS_RDONLY don't get set until *after* we're called. | |
988 | * mount_flags != mount_options */ | |
bd4c625c | 989 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
1da177e4 | 990 | { |
bd4c625c | 991 | int err = 0; |
ab17c4f0 | 992 | struct dentry *privroot = REISERFS_SB(s)->priv_root; |
bd4c625c | 993 | |
a72bdb1c JM |
994 | err = xattr_mount_check(s); |
995 | if (err) | |
bd4c625c | 996 | goto error; |
bd4c625c | 997 | |
ab17c4f0 | 998 | if (!privroot->d_inode && !(mount_flags & MS_RDONLY)) { |
ae635c0b | 999 | reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s); |
edcc37a0 | 1000 | err = create_privroot(REISERFS_SB(s)->priv_root); |
5a6059c3 | 1001 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
bd4c625c | 1002 | } |
ab17c4f0 JM |
1003 | |
1004 | if (privroot->d_inode) { | |
48b32a35 | 1005 | s->s_xattr = reiserfs_xattr_handlers; |
c72e0575 | 1006 | reiserfs_mutex_lock_safe(&privroot->d_inode->i_mutex, s); |
ab17c4f0 JM |
1007 | if (!REISERFS_SB(s)->xattr_root) { |
1008 | struct dentry *dentry; | |
1009 | dentry = lookup_one_len(XAROOT_NAME, privroot, | |
1010 | strlen(XAROOT_NAME)); | |
1011 | if (!IS_ERR(dentry)) | |
1012 | REISERFS_SB(s)->xattr_root = dentry; | |
1013 | else | |
1014 | err = PTR_ERR(dentry); | |
1015 | } | |
1016 | mutex_unlock(&privroot->d_inode->i_mutex); | |
1017 | } | |
48b32a35 | 1018 | |
a72bdb1c | 1019 | error: |
bd4c625c | 1020 | if (err) { |
bd4c625c LT |
1021 | clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt)); |
1022 | clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt)); | |
1023 | } | |
1024 | ||
1025 | /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */ | |
bd4c625c LT |
1026 | if (reiserfs_posixacl(s)) |
1027 | s->s_flags |= MS_POSIXACL; | |
ab17c4f0 | 1028 | else |
ab17c4f0 | 1029 | s->s_flags &= ~MS_POSIXACL; |
bd4c625c LT |
1030 | |
1031 | return err; | |
1da177e4 | 1032 | } |