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 | |
4c05141d | 84 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD); |
6c17675e JM |
85 | error = dir->i_op->unlink(dir, dentry); |
86 | mutex_unlock(&dentry->d_inode->i_mutex); | |
87 | ||
88 | if (!error) | |
89 | d_delete(dentry); | |
90 | return error; | |
91 | } | |
92 | ||
93 | static int xattr_rmdir(struct inode *dir, struct dentry *dentry) | |
94 | { | |
95 | int error; | |
96 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); | |
6c17675e | 97 | |
4c05141d | 98 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD); |
6c17675e JM |
99 | error = dir->i_op->rmdir(dir, dentry); |
100 | if (!error) | |
101 | dentry->d_inode->i_flags |= S_DEAD; | |
102 | mutex_unlock(&dentry->d_inode->i_mutex); | |
103 | if (!error) | |
104 | d_delete(dentry); | |
6c17675e JM |
105 | |
106 | return error; | |
107 | } | |
108 | ||
6c17675e JM |
109 | #define xattr_may_create(flags) (!flags || flags & XATTR_CREATE) |
110 | ||
ab17c4f0 | 111 | static struct dentry *open_xa_root(struct super_block *sb, int flags) |
6c17675e | 112 | { |
ab17c4f0 JM |
113 | struct dentry *privroot = REISERFS_SB(sb)->priv_root; |
114 | struct dentry *xaroot; | |
115 | if (!privroot->d_inode) | |
116 | return ERR_PTR(-ENODATA); | |
6c17675e | 117 | |
ab17c4f0 | 118 | mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR); |
6c17675e | 119 | |
ab17c4f0 | 120 | xaroot = dget(REISERFS_SB(sb)->xattr_root); |
ceb5edc4 JM |
121 | if (!xaroot) |
122 | xaroot = ERR_PTR(-ENODATA); | |
123 | else if (!xaroot->d_inode) { | |
ab17c4f0 | 124 | int err = -ENODATA; |
5a6059c3 | 125 | if (xattr_may_create(flags)) |
ab17c4f0 | 126 | err = xattr_mkdir(privroot->d_inode, xaroot, 0700); |
9b7f3755 | 127 | if (err) { |
ab17c4f0 JM |
128 | dput(xaroot); |
129 | xaroot = ERR_PTR(err); | |
9b7f3755 | 130 | } |
bd4c625c | 131 | } |
6c17675e | 132 | |
ab17c4f0 JM |
133 | mutex_unlock(&privroot->d_inode->i_mutex); |
134 | return xaroot; | |
1da177e4 LT |
135 | } |
136 | ||
bd4c625c | 137 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
1da177e4 | 138 | { |
bd4c625c LT |
139 | struct dentry *xaroot, *xadir; |
140 | char namebuf[17]; | |
141 | ||
6c17675e | 142 | xaroot = open_xa_root(inode->i_sb, flags); |
9b7f3755 | 143 | if (IS_ERR(xaroot)) |
bd4c625c | 144 | return xaroot; |
bd4c625c | 145 | |
bd4c625c LT |
146 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
147 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), | |
148 | inode->i_generation); | |
bd4c625c | 149 | |
ab17c4f0 JM |
150 | mutex_lock_nested(&xaroot->d_inode->i_mutex, I_MUTEX_XATTR); |
151 | ||
152 | xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf)); | |
153 | if (!IS_ERR(xadir) && !xadir->d_inode) { | |
154 | int err = -ENODATA; | |
155 | if (xattr_may_create(flags)) | |
156 | err = xattr_mkdir(xaroot->d_inode, xadir, 0700); | |
157 | if (err) { | |
158 | dput(xadir); | |
159 | xadir = ERR_PTR(err); | |
160 | } | |
161 | } | |
162 | ||
163 | mutex_unlock(&xaroot->d_inode->i_mutex); | |
bd4c625c LT |
164 | dput(xaroot); |
165 | return xadir; | |
1da177e4 LT |
166 | } |
167 | ||
48b32a35 JM |
168 | /* The following are side effects of other operations that aren't explicitly |
169 | * modifying extended attributes. This includes operations such as permissions | |
170 | * or ownership changes, object deletions, etc. */ | |
a41f1a47 | 171 | struct reiserfs_dentry_buf { |
4acf381e | 172 | struct dir_context ctx; |
a41f1a47 JM |
173 | struct dentry *xadir; |
174 | int count; | |
175 | struct dentry *dentries[8]; | |
176 | }; | |
bd4c625c | 177 | |
a72bdb1c | 178 | static int |
a41f1a47 JM |
179 | fill_with_dentries(void *buf, const char *name, int namelen, loff_t offset, |
180 | u64 ino, unsigned int d_type) | |
a72bdb1c | 181 | { |
a41f1a47 | 182 | struct reiserfs_dentry_buf *dbuf = buf; |
a72bdb1c | 183 | struct dentry *dentry; |
5a6059c3 | 184 | WARN_ON_ONCE(!mutex_is_locked(&dbuf->xadir->d_inode->i_mutex)); |
bd4c625c | 185 | |
a41f1a47 JM |
186 | if (dbuf->count == ARRAY_SIZE(dbuf->dentries)) |
187 | return -ENOSPC; | |
bd4c625c | 188 | |
35e5cbc0 JK |
189 | if (name[0] == '.' && (namelen < 2 || |
190 | (namelen == 2 && name[1] == '.'))) | |
a41f1a47 | 191 | return 0; |
bd4c625c | 192 | |
a41f1a47 | 193 | dentry = lookup_one_len(name, dbuf->xadir, namelen); |
a72bdb1c | 194 | if (IS_ERR(dentry)) { |
a41f1a47 | 195 | return PTR_ERR(dentry); |
a72bdb1c | 196 | } else if (!dentry->d_inode) { |
a41f1a47 JM |
197 | /* A directory entry exists, but no file? */ |
198 | reiserfs_error(dentry->d_sb, "xattr-20003", | |
199 | "Corrupted directory: xattr %s listed but " | |
200 | "not found for file %s.\n", | |
201 | dentry->d_name.name, dbuf->xadir->d_name.name); | |
202 | dput(dentry); | |
203 | return -EIO; | |
bd4c625c | 204 | } |
1da177e4 | 205 | |
a41f1a47 JM |
206 | dbuf->dentries[dbuf->count++] = dentry; |
207 | return 0; | |
1da177e4 LT |
208 | } |
209 | ||
a41f1a47 JM |
210 | static void |
211 | cleanup_dentry_buf(struct reiserfs_dentry_buf *buf) | |
1da177e4 | 212 | { |
a41f1a47 JM |
213 | int i; |
214 | for (i = 0; i < buf->count; i++) | |
215 | if (buf->dentries[i]) | |
216 | dput(buf->dentries[i]); | |
a72bdb1c JM |
217 | } |
218 | ||
a41f1a47 JM |
219 | static int reiserfs_for_each_xattr(struct inode *inode, |
220 | int (*action)(struct dentry *, void *), | |
221 | void *data) | |
a72bdb1c | 222 | { |
a41f1a47 JM |
223 | struct dentry *dir; |
224 | int i, err = 0; | |
a41f1a47 | 225 | struct reiserfs_dentry_buf buf = { |
4acf381e | 226 | .ctx.actor = fill_with_dentries, |
a41f1a47 | 227 | }; |
1da177e4 | 228 | |
a72bdb1c JM |
229 | /* Skip out, an xattr has no xattrs associated with it */ |
230 | if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1) | |
231 | return 0; | |
1da177e4 | 232 | |
6c17675e | 233 | dir = open_xa_dir(inode, XATTR_REPLACE); |
a72bdb1c JM |
234 | if (IS_ERR(dir)) { |
235 | err = PTR_ERR(dir); | |
236 | goto out; | |
237 | } else if (!dir->d_inode) { | |
a41f1a47 JM |
238 | err = 0; |
239 | goto out_dir; | |
a72bdb1c | 240 | } |
1da177e4 | 241 | |
6c17675e | 242 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
27026a05 | 243 | |
a41f1a47 | 244 | buf.xadir = dir; |
cd62cdae AV |
245 | while (1) { |
246 | err = reiserfs_readdir_inode(dir->d_inode, &buf.ctx); | |
247 | if (err) | |
248 | break; | |
249 | if (!buf.count) | |
250 | break; | |
251 | for (i = 0; !err && i < buf.count && buf.dentries[i]; i++) { | |
a41f1a47 | 252 | struct dentry *dentry = buf.dentries[i]; |
1da177e4 | 253 | |
cd62cdae AV |
254 | if (!S_ISDIR(dentry->d_inode->i_mode)) |
255 | err = action(dentry, data); | |
1da177e4 | 256 | |
a41f1a47 JM |
257 | dput(dentry); |
258 | buf.dentries[i] = NULL; | |
bd4c625c | 259 | } |
cd62cdae AV |
260 | if (err) |
261 | break; | |
a41f1a47 | 262 | buf.count = 0; |
8b6dd72a | 263 | } |
a41f1a47 | 264 | mutex_unlock(&dir->d_inode->i_mutex); |
1da177e4 | 265 | |
a41f1a47 | 266 | cleanup_dentry_buf(&buf); |
1da177e4 | 267 | |
d984561b | 268 | if (!err) { |
a41f1a47 JM |
269 | /* We start a transaction here to avoid a ABBA situation |
270 | * between the xattr root's i_mutex and the journal lock. | |
271 | * This doesn't incur much additional overhead since the | |
272 | * new transaction will just nest inside the | |
273 | * outer transaction. */ | |
274 | int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + | |
275 | 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); | |
276 | struct reiserfs_transaction_handle th; | |
4c05141d | 277 | reiserfs_write_lock(inode->i_sb); |
a41f1a47 | 278 | err = journal_begin(&th, inode->i_sb, blocks); |
4c05141d | 279 | reiserfs_write_unlock(inode->i_sb); |
a41f1a47 JM |
280 | if (!err) { |
281 | int jerror; | |
4c05141d JM |
282 | mutex_lock_nested(&dir->d_parent->d_inode->i_mutex, |
283 | I_MUTEX_XATTR); | |
a41f1a47 | 284 | err = action(dir, data); |
4c05141d | 285 | reiserfs_write_lock(inode->i_sb); |
a41f1a47 | 286 | jerror = journal_end(&th, inode->i_sb, blocks); |
4c05141d | 287 | reiserfs_write_unlock(inode->i_sb); |
a41f1a47 JM |
288 | mutex_unlock(&dir->d_parent->d_inode->i_mutex); |
289 | err = jerror ?: err; | |
290 | } | |
a72bdb1c | 291 | } |
a41f1a47 JM |
292 | out_dir: |
293 | dput(dir); | |
a72bdb1c | 294 | out: |
a41f1a47 JM |
295 | /* -ENODATA isn't an error */ |
296 | if (err == -ENODATA) | |
297 | err = 0; | |
a72bdb1c JM |
298 | return err; |
299 | } | |
1da177e4 | 300 | |
a41f1a47 | 301 | static int delete_one_xattr(struct dentry *dentry, void *data) |
a72bdb1c | 302 | { |
a41f1a47 | 303 | struct inode *dir = dentry->d_parent->d_inode; |
1da177e4 | 304 | |
a41f1a47 JM |
305 | /* This is the xattr dir, handle specially. */ |
306 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
307 | return xattr_rmdir(dir, dentry); | |
1da177e4 | 308 | |
a41f1a47 JM |
309 | return xattr_unlink(dir, dentry); |
310 | } | |
bd4c625c | 311 | |
a41f1a47 JM |
312 | static int chown_one_xattr(struct dentry *dentry, void *data) |
313 | { | |
314 | struct iattr *attrs = data; | |
4a857011 JM |
315 | int ia_valid = attrs->ia_valid; |
316 | int err; | |
317 | ||
318 | /* | |
319 | * We only want the ownership bits. Otherwise, we'll do | |
320 | * things like change a directory to a regular file if | |
321 | * ATTR_MODE is set. | |
322 | */ | |
323 | attrs->ia_valid &= (ATTR_UID|ATTR_GID); | |
324 | err = reiserfs_setattr(dentry, attrs); | |
325 | attrs->ia_valid = ia_valid; | |
326 | ||
327 | return err; | |
a41f1a47 | 328 | } |
1da177e4 | 329 | |
a41f1a47 JM |
330 | /* No i_mutex, but the inode is unconnected. */ |
331 | int reiserfs_delete_xattrs(struct inode *inode) | |
332 | { | |
333 | int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); | |
334 | if (err) | |
335 | reiserfs_warning(inode->i_sb, "jdm-20004", | |
336 | "Couldn't delete all xattrs (%d)\n", err); | |
a72bdb1c JM |
337 | return err; |
338 | } | |
1da177e4 | 339 | |
a41f1a47 | 340 | /* inode->i_mutex: down */ |
a72bdb1c JM |
341 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
342 | { | |
a41f1a47 | 343 | int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); |
8b6dd72a JM |
344 | if (err) |
345 | reiserfs_warning(inode->i_sb, "jdm-20007", | |
346 | "Couldn't chown all xattrs (%d)\n", err); | |
a72bdb1c | 347 | return err; |
1da177e4 LT |
348 | } |
349 | ||
a72bdb1c | 350 | #ifdef CONFIG_REISERFS_FS_XATTR |
a72bdb1c JM |
351 | /* Returns a dentry corresponding to a specific extended attribute file |
352 | * for the inode. If flags allow, the file is created. Otherwise, a | |
353 | * valid or negative dentry, or an error is returned. */ | |
48b32a35 JM |
354 | static struct dentry *xattr_lookup(struct inode *inode, const char *name, |
355 | int flags) | |
1da177e4 | 356 | { |
a72bdb1c JM |
357 | struct dentry *xadir, *xafile; |
358 | int err = 0; | |
359 | ||
360 | xadir = open_xa_dir(inode, flags); | |
6c17675e | 361 | if (IS_ERR(xadir)) |
a72bdb1c | 362 | return ERR_CAST(xadir); |
a72bdb1c | 363 | |
5a6059c3 | 364 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
a72bdb1c JM |
365 | xafile = lookup_one_len(name, xadir, strlen(name)); |
366 | if (IS_ERR(xafile)) { | |
6c17675e JM |
367 | err = PTR_ERR(xafile); |
368 | goto out; | |
bd4c625c | 369 | } |
a72bdb1c | 370 | |
6c17675e JM |
371 | if (xafile->d_inode && (flags & XATTR_CREATE)) |
372 | err = -EEXIST; | |
a72bdb1c | 373 | |
6c17675e JM |
374 | if (!xafile->d_inode) { |
375 | err = -ENODATA; | |
5a6059c3 | 376 | if (xattr_may_create(flags)) |
6c17675e JM |
377 | err = xattr_create(xadir->d_inode, xafile, |
378 | 0700|S_IFREG); | |
a72bdb1c JM |
379 | } |
380 | ||
6c17675e JM |
381 | if (err) |
382 | dput(xafile); | |
a72bdb1c | 383 | out: |
5a6059c3 | 384 | mutex_unlock(&xadir->d_inode->i_mutex); |
a72bdb1c JM |
385 | dput(xadir); |
386 | if (err) | |
6c17675e | 387 | return ERR_PTR(err); |
a72bdb1c | 388 | return xafile; |
1da177e4 LT |
389 | } |
390 | ||
1da177e4 | 391 | /* Internal operations on file data */ |
bd4c625c | 392 | static inline void reiserfs_put_page(struct page *page) |
1da177e4 | 393 | { |
bd4c625c LT |
394 | kunmap(page); |
395 | page_cache_release(page); | |
1da177e4 LT |
396 | } |
397 | ||
ec6ea56b | 398 | static struct page *reiserfs_get_page(struct inode *dir, size_t n) |
1da177e4 | 399 | { |
bd4c625c LT |
400 | struct address_space *mapping = dir->i_mapping; |
401 | struct page *page; | |
402 | /* We can deadlock if we try to free dentries, | |
25985edc | 403 | and an unlink/rmdir has just occurred - GFP_NOFS avoids this */ |
c4cdd038 | 404 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
ec6ea56b | 405 | page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL); |
bd4c625c | 406 | if (!IS_ERR(page)) { |
bd4c625c | 407 | kmap(page); |
bd4c625c LT |
408 | if (PageError(page)) |
409 | goto fail; | |
410 | } | |
411 | return page; | |
412 | ||
413 | fail: | |
414 | reiserfs_put_page(page); | |
415 | return ERR_PTR(-EIO); | |
1da177e4 LT |
416 | } |
417 | ||
bd4c625c | 418 | static inline __u32 xattr_hash(const char *msg, int len) |
1da177e4 | 419 | { |
bd4c625c | 420 | return csum_partial(msg, len, 0); |
1da177e4 LT |
421 | } |
422 | ||
ba9d8cec VS |
423 | int reiserfs_commit_write(struct file *f, struct page *page, |
424 | unsigned from, unsigned to); | |
ba9d8cec | 425 | |
48b32a35 JM |
426 | static void update_ctime(struct inode *inode) |
427 | { | |
428 | struct timespec now = current_fs_time(inode->i_sb); | |
1d3382cb | 429 | if (inode_unhashed(inode) || !inode->i_nlink || |
48b32a35 JM |
430 | timespec_equal(&inode->i_ctime, &now)) |
431 | return; | |
432 | ||
433 | inode->i_ctime = CURRENT_TIME_SEC; | |
434 | mark_inode_dirty(inode); | |
435 | } | |
436 | ||
437 | static int lookup_and_delete_xattr(struct inode *inode, const char *name) | |
438 | { | |
439 | int err = 0; | |
440 | struct dentry *dentry, *xadir; | |
441 | ||
442 | xadir = open_xa_dir(inode, XATTR_REPLACE); | |
443 | if (IS_ERR(xadir)) | |
444 | return PTR_ERR(xadir); | |
445 | ||
5a6059c3 | 446 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
48b32a35 JM |
447 | dentry = lookup_one_len(name, xadir, strlen(name)); |
448 | if (IS_ERR(dentry)) { | |
449 | err = PTR_ERR(dentry); | |
450 | goto out_dput; | |
451 | } | |
452 | ||
453 | if (dentry->d_inode) { | |
48b32a35 | 454 | err = xattr_unlink(xadir->d_inode, dentry); |
48b32a35 JM |
455 | update_ctime(inode); |
456 | } | |
457 | ||
458 | dput(dentry); | |
459 | out_dput: | |
5a6059c3 | 460 | mutex_unlock(&xadir->d_inode->i_mutex); |
48b32a35 JM |
461 | dput(xadir); |
462 | return err; | |
463 | } | |
464 | ||
ba9d8cec | 465 | |
1da177e4 LT |
466 | /* Generic extended attribute operations that can be used by xa plugins */ |
467 | ||
468 | /* | |
1b1dcc1b | 469 | * inode->i_mutex: down |
1da177e4 LT |
470 | */ |
471 | int | |
0ab2621e JM |
472 | reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, |
473 | struct inode *inode, const char *name, | |
474 | const void *buffer, size_t buffer_size, int flags) | |
1da177e4 | 475 | { |
bd4c625c | 476 | int err = 0; |
3227e14c | 477 | struct dentry *dentry; |
bd4c625c LT |
478 | struct page *page; |
479 | char *data; | |
bd4c625c LT |
480 | size_t file_pos = 0; |
481 | size_t buffer_pos = 0; | |
48b32a35 | 482 | size_t new_size; |
bd4c625c LT |
483 | __u32 xahash = 0; |
484 | ||
bd4c625c LT |
485 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
486 | return -EOPNOTSUPP; | |
487 | ||
4f3be1b5 FW |
488 | if (!buffer) { |
489 | err = lookup_and_delete_xattr(inode, name); | |
4f3be1b5 FW |
490 | return err; |
491 | } | |
492 | ||
48b32a35 | 493 | dentry = xattr_lookup(inode, name, flags); |
4c05141d | 494 | if (IS_ERR(dentry)) |
48b32a35 | 495 | return PTR_ERR(dentry); |
3f14fea6 | 496 | |
f3e22f48 | 497 | down_write(&REISERFS_I(inode)->i_xattr_sem); |
bd4c625c | 498 | |
8b6dd72a | 499 | xahash = xattr_hash(buffer, buffer_size); |
bd4c625c LT |
500 | while (buffer_pos < buffer_size || buffer_pos == 0) { |
501 | size_t chunk; | |
502 | size_t skip = 0; | |
503 | size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1)); | |
504 | if (buffer_size - buffer_pos > PAGE_CACHE_SIZE) | |
505 | chunk = PAGE_CACHE_SIZE; | |
506 | else | |
507 | chunk = buffer_size - buffer_pos; | |
508 | ||
ec6ea56b | 509 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
510 | if (IS_ERR(page)) { |
511 | err = PTR_ERR(page); | |
48b32a35 | 512 | goto out_unlock; |
bd4c625c LT |
513 | } |
514 | ||
515 | lock_page(page); | |
516 | data = page_address(page); | |
517 | ||
518 | if (file_pos == 0) { | |
519 | struct reiserfs_xattr_header *rxh; | |
520 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
521 | if (chunk + skip > PAGE_CACHE_SIZE) | |
522 | chunk = PAGE_CACHE_SIZE - skip; | |
523 | rxh = (struct reiserfs_xattr_header *)data; | |
524 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); | |
525 | rxh->h_hash = cpu_to_le32(xahash); | |
526 | } | |
527 | ||
4c05141d | 528 | reiserfs_write_lock(inode->i_sb); |
ebdec241 | 529 | err = __reiserfs_write_begin(page, page_offset, chunk + skip); |
bd4c625c LT |
530 | if (!err) { |
531 | if (buffer) | |
532 | memcpy(data + skip, buffer + buffer_pos, chunk); | |
3227e14c JM |
533 | err = reiserfs_commit_write(NULL, page, page_offset, |
534 | page_offset + chunk + | |
535 | skip); | |
bd4c625c | 536 | } |
4c05141d | 537 | reiserfs_write_unlock(inode->i_sb); |
bd4c625c LT |
538 | unlock_page(page); |
539 | reiserfs_put_page(page); | |
540 | buffer_pos += chunk; | |
541 | file_pos += chunk; | |
542 | skip = 0; | |
543 | if (err || buffer_size == 0 || !buffer) | |
544 | break; | |
545 | } | |
546 | ||
48b32a35 JM |
547 | new_size = buffer_size + sizeof(struct reiserfs_xattr_header); |
548 | if (!err && new_size < i_size_read(dentry->d_inode)) { | |
549 | struct iattr newattrs = { | |
550 | .ia_ctime = current_fs_time(inode->i_sb), | |
fb2162df | 551 | .ia_size = new_size, |
48b32a35 JM |
552 | .ia_valid = ATTR_SIZE | ATTR_CTIME, |
553 | }; | |
31370f62 | 554 | |
48b32a35 | 555 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR); |
bd5fe6c5 | 556 | inode_dio_wait(dentry->d_inode); |
31370f62 | 557 | |
48b32a35 | 558 | err = reiserfs_setattr(dentry, &newattrs); |
48b32a35 JM |
559 | mutex_unlock(&dentry->d_inode->i_mutex); |
560 | } else | |
561 | update_ctime(inode); | |
562 | out_unlock: | |
8b6dd72a | 563 | up_write(&REISERFS_I(inode)->i_xattr_sem); |
3227e14c | 564 | dput(dentry); |
48b32a35 JM |
565 | return err; |
566 | } | |
bd4c625c | 567 | |
0ab2621e JM |
568 | /* We need to start a transaction to maintain lock ordering */ |
569 | int reiserfs_xattr_set(struct inode *inode, const char *name, | |
570 | const void *buffer, size_t buffer_size, int flags) | |
48b32a35 | 571 | { |
0ab2621e JM |
572 | |
573 | struct reiserfs_transaction_handle th; | |
574 | int error, error2; | |
575 | size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size); | |
576 | ||
577 | if (!(flags & XATTR_REPLACE)) | |
578 | jbegin_count += reiserfs_xattr_jcreate_nblocks(inode); | |
579 | ||
580 | reiserfs_write_lock(inode->i_sb); | |
581 | error = journal_begin(&th, inode->i_sb, jbegin_count); | |
4c05141d | 582 | reiserfs_write_unlock(inode->i_sb); |
0ab2621e | 583 | if (error) { |
0ab2621e | 584 | return error; |
1da177e4 | 585 | } |
bd4c625c | 586 | |
0ab2621e JM |
587 | error = reiserfs_xattr_set_handle(&th, inode, name, |
588 | buffer, buffer_size, flags); | |
bd4c625c | 589 | |
4c05141d | 590 | reiserfs_write_lock(inode->i_sb); |
0ab2621e | 591 | error2 = journal_end(&th, inode->i_sb, jbegin_count); |
4c05141d | 592 | reiserfs_write_unlock(inode->i_sb); |
0ab2621e JM |
593 | if (error == 0) |
594 | error = error2; | |
0ab2621e JM |
595 | |
596 | return error; | |
1da177e4 LT |
597 | } |
598 | ||
599 | /* | |
1b1dcc1b | 600 | * inode->i_mutex: down |
1da177e4 LT |
601 | */ |
602 | int | |
48b32a35 | 603 | reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, |
bd4c625c | 604 | size_t buffer_size) |
1da177e4 | 605 | { |
bd4c625c | 606 | ssize_t err = 0; |
3227e14c | 607 | struct dentry *dentry; |
bd4c625c LT |
608 | size_t isize; |
609 | size_t file_pos = 0; | |
610 | size_t buffer_pos = 0; | |
611 | struct page *page; | |
bd4c625c LT |
612 | __u32 hash = 0; |
613 | ||
614 | if (name == NULL) | |
615 | return -EINVAL; | |
616 | ||
617 | /* We can't have xattrs attached to v1 items since they don't have | |
618 | * generation numbers */ | |
619 | if (get_inode_sd_version(inode) == STAT_DATA_V1) | |
620 | return -EOPNOTSUPP; | |
621 | ||
48b32a35 | 622 | dentry = xattr_lookup(inode, name, XATTR_REPLACE); |
3227e14c JM |
623 | if (IS_ERR(dentry)) { |
624 | err = PTR_ERR(dentry); | |
bd4c625c LT |
625 | goto out; |
626 | } | |
627 | ||
8b6dd72a | 628 | down_read(&REISERFS_I(inode)->i_xattr_sem); |
d984561b | 629 | |
f437c529 | 630 | isize = i_size_read(dentry->d_inode); |
bd4c625c LT |
631 | |
632 | /* Just return the size needed */ | |
633 | if (buffer == NULL) { | |
634 | err = isize - sizeof(struct reiserfs_xattr_header); | |
8b6dd72a | 635 | goto out_unlock; |
bd4c625c LT |
636 | } |
637 | ||
638 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { | |
639 | err = -ERANGE; | |
8b6dd72a | 640 | goto out_unlock; |
bd4c625c LT |
641 | } |
642 | ||
643 | while (file_pos < isize) { | |
644 | size_t chunk; | |
645 | char *data; | |
646 | size_t skip = 0; | |
647 | if (isize - file_pos > PAGE_CACHE_SIZE) | |
648 | chunk = PAGE_CACHE_SIZE; | |
649 | else | |
650 | chunk = isize - file_pos; | |
651 | ||
a72bdb1c | 652 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
653 | if (IS_ERR(page)) { |
654 | err = PTR_ERR(page); | |
8b6dd72a | 655 | goto out_unlock; |
bd4c625c LT |
656 | } |
657 | ||
658 | lock_page(page); | |
659 | data = page_address(page); | |
660 | if (file_pos == 0) { | |
661 | struct reiserfs_xattr_header *rxh = | |
662 | (struct reiserfs_xattr_header *)data; | |
663 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
664 | chunk -= skip; | |
665 | /* Magic doesn't match up.. */ | |
666 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { | |
667 | unlock_page(page); | |
668 | reiserfs_put_page(page); | |
a72bdb1c | 669 | reiserfs_warning(inode->i_sb, "jdm-20001", |
bd4c625c LT |
670 | "Invalid magic for xattr (%s) " |
671 | "associated with %k", name, | |
672 | INODE_PKEY(inode)); | |
673 | err = -EIO; | |
8b6dd72a | 674 | goto out_unlock; |
bd4c625c LT |
675 | } |
676 | hash = le32_to_cpu(rxh->h_hash); | |
677 | } | |
678 | memcpy(buffer + buffer_pos, data + skip, chunk); | |
679 | unlock_page(page); | |
680 | reiserfs_put_page(page); | |
681 | file_pos += chunk; | |
682 | buffer_pos += chunk; | |
683 | skip = 0; | |
684 | } | |
685 | err = isize - sizeof(struct reiserfs_xattr_header); | |
686 | ||
687 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != | |
688 | hash) { | |
a72bdb1c | 689 | reiserfs_warning(inode->i_sb, "jdm-20002", |
bd4c625c LT |
690 | "Invalid hash for xattr (%s) associated " |
691 | "with %k", name, INODE_PKEY(inode)); | |
692 | err = -EIO; | |
693 | } | |
694 | ||
8b6dd72a JM |
695 | out_unlock: |
696 | up_read(&REISERFS_I(inode)->i_xattr_sem); | |
3227e14c | 697 | dput(dentry); |
bd4c625c | 698 | |
a72bdb1c | 699 | out: |
bd4c625c | 700 | return err; |
1da177e4 LT |
701 | } |
702 | ||
48b32a35 JM |
703 | /* |
704 | * In order to implement different sets of xattr operations for each xattr | |
705 | * prefix with the generic xattr API, a filesystem should create a | |
706 | * null-terminated array of struct xattr_handler (one for each prefix) and | |
707 | * hang a pointer to it off of the s_xattr field of the superblock. | |
708 | * | |
709 | * The generic_fooxattr() functions will use this list to dispatch xattr | |
710 | * operations to the correct xattr_handler. | |
711 | */ | |
712 | #define for_each_xattr_handler(handlers, handler) \ | |
713 | for ((handler) = *(handlers)++; \ | |
714 | (handler) != NULL; \ | |
715 | (handler) = *(handlers)++) | |
1da177e4 | 716 | |
48b32a35 | 717 | /* This is the implementation for the xattr plugin infrastructure */ |
94d09a98 SH |
718 | static inline const struct xattr_handler * |
719 | find_xattr_handler_prefix(const struct xattr_handler **handlers, | |
48b32a35 | 720 | const char *name) |
1da177e4 | 721 | { |
94d09a98 | 722 | const struct xattr_handler *xah; |
bd4c625c | 723 | |
48b32a35 JM |
724 | if (!handlers) |
725 | return NULL; | |
bd4c625c | 726 | |
48b32a35 JM |
727 | for_each_xattr_handler(handlers, xah) { |
728 | if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0) | |
729 | break; | |
bd4c625c LT |
730 | } |
731 | ||
48b32a35 | 732 | return xah; |
bd4c625c | 733 | } |
1da177e4 | 734 | |
1da177e4 LT |
735 | |
736 | /* | |
737 | * Inode operation getxattr() | |
1da177e4 LT |
738 | */ |
739 | ssize_t | |
bd4c625c LT |
740 | reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, |
741 | size_t size) | |
1da177e4 | 742 | { |
94d09a98 | 743 | const struct xattr_handler *handler; |
bd4c625c | 744 | |
431547b3 | 745 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 746 | |
431547b3 | 747 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c LT |
748 | return -EOPNOTSUPP; |
749 | ||
431547b3 | 750 | return handler->get(dentry, name, buffer, size, handler->flags); |
1da177e4 LT |
751 | } |
752 | ||
1da177e4 LT |
753 | /* |
754 | * Inode operation setxattr() | |
755 | * | |
1b1dcc1b | 756 | * dentry->d_inode->i_mutex down |
1da177e4 LT |
757 | */ |
758 | int | |
bd4c625c LT |
759 | reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
760 | size_t size, int flags) | |
1da177e4 | 761 | { |
94d09a98 | 762 | const struct xattr_handler *handler; |
bd4c625c | 763 | |
431547b3 | 764 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 765 | |
431547b3 | 766 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c LT |
767 | return -EOPNOTSUPP; |
768 | ||
431547b3 | 769 | return handler->set(dentry, name, value, size, flags, handler->flags); |
1da177e4 LT |
770 | } |
771 | ||
772 | /* | |
773 | * Inode operation removexattr() | |
774 | * | |
1b1dcc1b | 775 | * dentry->d_inode->i_mutex down |
1da177e4 | 776 | */ |
bd4c625c | 777 | int reiserfs_removexattr(struct dentry *dentry, const char *name) |
1da177e4 | 778 | { |
94d09a98 | 779 | const struct xattr_handler *handler; |
431547b3 | 780 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
1da177e4 | 781 | |
431547b3 | 782 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c | 783 | return -EOPNOTSUPP; |
1da177e4 | 784 | |
431547b3 | 785 | return handler->set(dentry, name, NULL, 0, XATTR_REPLACE, handler->flags); |
1da177e4 LT |
786 | } |
787 | ||
48b32a35 | 788 | struct listxattr_buf { |
4acf381e | 789 | struct dir_context ctx; |
48b32a35 JM |
790 | size_t size; |
791 | size_t pos; | |
792 | char *buf; | |
431547b3 | 793 | struct dentry *dentry; |
1da177e4 LT |
794 | }; |
795 | ||
48b32a35 JM |
796 | static int listxattr_filler(void *buf, const char *name, int namelen, |
797 | loff_t offset, u64 ino, unsigned int d_type) | |
1da177e4 | 798 | { |
48b32a35 JM |
799 | struct listxattr_buf *b = (struct listxattr_buf *)buf; |
800 | size_t size; | |
801 | if (name[0] != '.' || | |
802 | (namelen != 1 && (name[1] != '.' || namelen != 2))) { | |
94d09a98 | 803 | const struct xattr_handler *handler; |
431547b3 | 804 | handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr, |
48b32a35 JM |
805 | name); |
806 | if (!handler) /* Unsupported xattr name */ | |
807 | return 0; | |
808 | if (b->buf) { | |
431547b3 CH |
809 | size = handler->list(b->dentry, b->buf + b->pos, |
810 | b->size, name, namelen, | |
811 | handler->flags); | |
48b32a35 JM |
812 | if (size > b->size) |
813 | return -ERANGE; | |
814 | } else { | |
431547b3 CH |
815 | size = handler->list(b->dentry, NULL, 0, name, |
816 | namelen, handler->flags); | |
bd4c625c | 817 | } |
bd4c625c | 818 | |
48b32a35 JM |
819 | b->pos += size; |
820 | } | |
bd4c625c | 821 | return 0; |
1da177e4 | 822 | } |
bd4c625c | 823 | |
1da177e4 LT |
824 | /* |
825 | * Inode operation listxattr() | |
826 | * | |
48b32a35 JM |
827 | * We totally ignore the generic listxattr here because it would be stupid |
828 | * not to. Since the xattrs are organized in a directory, we can just | |
829 | * readdir to find them. | |
1da177e4 | 830 | */ |
bd4c625c | 831 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
1da177e4 | 832 | { |
bd4c625c LT |
833 | struct dentry *dir; |
834 | int err = 0; | |
48b32a35 | 835 | struct listxattr_buf buf = { |
4acf381e | 836 | .ctx.actor = listxattr_filler, |
431547b3 | 837 | .dentry = dentry, |
48b32a35 JM |
838 | .buf = buffer, |
839 | .size = buffer ? size : 0, | |
840 | }; | |
bd4c625c LT |
841 | |
842 | if (!dentry->d_inode) | |
843 | return -EINVAL; | |
844 | ||
677c9b2e | 845 | if (!dentry->d_sb->s_xattr || |
bd4c625c LT |
846 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
847 | return -EOPNOTSUPP; | |
848 | ||
6c17675e | 849 | dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE); |
bd4c625c LT |
850 | if (IS_ERR(dir)) { |
851 | err = PTR_ERR(dir); | |
852 | if (err == -ENODATA) | |
48b32a35 | 853 | err = 0; /* Not an error if there aren't any xattrs */ |
bd4c625c LT |
854 | goto out; |
855 | } | |
856 | ||
6c17675e | 857 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
cd62cdae | 858 | err = reiserfs_readdir_inode(dir->d_inode, &buf.ctx); |
6c17675e | 859 | mutex_unlock(&dir->d_inode->i_mutex); |
bd4c625c | 860 | |
48b32a35 JM |
861 | if (!err) |
862 | err = buf.pos; | |
bd4c625c | 863 | |
3227e14c | 864 | dput(dir); |
8b6dd72a | 865 | out: |
bd4c625c | 866 | return err; |
1da177e4 LT |
867 | } |
868 | ||
a72bdb1c | 869 | static int create_privroot(struct dentry *dentry) |
1da177e4 | 870 | { |
a72bdb1c JM |
871 | int err; |
872 | struct inode *inode = dentry->d_parent->d_inode; | |
5a6059c3 JM |
873 | WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex)); |
874 | ||
6c17675e | 875 | err = xattr_mkdir(inode, dentry, 0700); |
edcc37a0 AV |
876 | if (err || !dentry->d_inode) { |
877 | reiserfs_warning(dentry->d_sb, "jdm-20006", | |
878 | "xattrs/ACLs enabled and couldn't " | |
879 | "find/create .reiserfs_priv. " | |
880 | "Failing mount."); | |
881 | return -EOPNOTSUPP; | |
bd4c625c LT |
882 | } |
883 | ||
edcc37a0 AV |
884 | dentry->d_inode->i_flags |= S_PRIVATE; |
885 | reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr " | |
886 | "storage.\n", PRIVROOT_NAME); | |
bd4c625c | 887 | |
edcc37a0 | 888 | return 0; |
1da177e4 LT |
889 | } |
890 | ||
12abb35a JM |
891 | #else |
892 | int __init reiserfs_xattr_register_handlers(void) { return 0; } | |
893 | void reiserfs_xattr_unregister_handlers(void) {} | |
894 | static int create_privroot(struct dentry *dentry) { return 0; } | |
895 | #endif | |
896 | ||
897 | /* Actual operations that are exported to VFS-land */ | |
da02eb72 | 898 | static const struct xattr_handler *reiserfs_xattr_handlers[] = { |
12abb35a JM |
899 | #ifdef CONFIG_REISERFS_FS_XATTR |
900 | &reiserfs_xattr_user_handler, | |
901 | &reiserfs_xattr_trusted_handler, | |
902 | #endif | |
903 | #ifdef CONFIG_REISERFS_FS_SECURITY | |
904 | &reiserfs_xattr_security_handler, | |
905 | #endif | |
906 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL | |
907 | &reiserfs_posix_acl_access_handler, | |
908 | &reiserfs_posix_acl_default_handler, | |
909 | #endif | |
910 | NULL | |
911 | }; | |
912 | ||
a72bdb1c | 913 | static int xattr_mount_check(struct super_block *s) |
1da177e4 | 914 | { |
a72bdb1c JM |
915 | /* We need generation numbers to ensure that the oid mapping is correct |
916 | * v3.5 filesystems don't have them. */ | |
48b32a35 JM |
917 | if (old_format_only(s)) { |
918 | if (reiserfs_xattrs_optional(s)) { | |
919 | /* Old format filesystem, but optional xattrs have | |
920 | * been enabled. Error out. */ | |
921 | reiserfs_warning(s, "jdm-2005", | |
922 | "xattrs/ACLs not supported " | |
923 | "on pre-v3.6 format filesystems. " | |
924 | "Failing mount."); | |
925 | return -EOPNOTSUPP; | |
926 | } | |
a72bdb1c JM |
927 | } |
928 | ||
929 | return 0; | |
1da177e4 LT |
930 | } |
931 | ||
10556cb2 | 932 | int reiserfs_permission(struct inode *inode, int mask) |
b83674c0 JM |
933 | { |
934 | /* | |
935 | * We don't do permission checks on the internal objects. | |
936 | * Permissions are determined by the "owning" object. | |
937 | */ | |
938 | if (IS_PRIVATE(inode)) | |
939 | return 0; | |
940 | ||
2830ba7f | 941 | return generic_permission(inode, mask); |
b83674c0 JM |
942 | } |
943 | ||
0b728e19 | 944 | static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 945 | { |
cac36f70 | 946 | return -EPERM; |
1da177e4 LT |
947 | } |
948 | ||
e16404ed | 949 | static const struct dentry_operations xattr_lookup_poison_ops = { |
cac36f70 | 950 | .d_revalidate = xattr_hide_revalidate, |
1da177e4 LT |
951 | }; |
952 | ||
edcc37a0 AV |
953 | int reiserfs_lookup_privroot(struct super_block *s) |
954 | { | |
955 | struct dentry *dentry; | |
956 | int err = 0; | |
957 | ||
958 | /* If we don't have the privroot located yet - go find it */ | |
4c05141d | 959 | mutex_lock(&s->s_root->d_inode->i_mutex); |
edcc37a0 AV |
960 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, |
961 | strlen(PRIVROOT_NAME)); | |
962 | if (!IS_ERR(dentry)) { | |
963 | REISERFS_SB(s)->priv_root = dentry; | |
fb045adb | 964 | d_set_d_op(dentry, &xattr_lookup_poison_ops); |
edcc37a0 AV |
965 | if (dentry->d_inode) |
966 | dentry->d_inode->i_flags |= S_PRIVATE; | |
967 | } else | |
968 | err = PTR_ERR(dentry); | |
969 | mutex_unlock(&s->s_root->d_inode->i_mutex); | |
970 | ||
971 | return err; | |
972 | } | |
973 | ||
1da177e4 LT |
974 | /* We need to take a copy of the mount flags since things like |
975 | * MS_RDONLY don't get set until *after* we're called. | |
976 | * mount_flags != mount_options */ | |
bd4c625c | 977 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
1da177e4 | 978 | { |
bd4c625c | 979 | int err = 0; |
ab17c4f0 | 980 | struct dentry *privroot = REISERFS_SB(s)->priv_root; |
bd4c625c | 981 | |
a72bdb1c JM |
982 | err = xattr_mount_check(s); |
983 | if (err) | |
bd4c625c | 984 | goto error; |
bd4c625c | 985 | |
ab17c4f0 | 986 | if (!privroot->d_inode && !(mount_flags & MS_RDONLY)) { |
4c05141d | 987 | mutex_lock(&s->s_root->d_inode->i_mutex); |
edcc37a0 | 988 | err = create_privroot(REISERFS_SB(s)->priv_root); |
5a6059c3 | 989 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
bd4c625c | 990 | } |
ab17c4f0 JM |
991 | |
992 | if (privroot->d_inode) { | |
48b32a35 | 993 | s->s_xattr = reiserfs_xattr_handlers; |
4c05141d | 994 | mutex_lock(&privroot->d_inode->i_mutex); |
ab17c4f0 JM |
995 | if (!REISERFS_SB(s)->xattr_root) { |
996 | struct dentry *dentry; | |
997 | dentry = lookup_one_len(XAROOT_NAME, privroot, | |
998 | strlen(XAROOT_NAME)); | |
999 | if (!IS_ERR(dentry)) | |
1000 | REISERFS_SB(s)->xattr_root = dentry; | |
1001 | else | |
1002 | err = PTR_ERR(dentry); | |
1003 | } | |
1004 | mutex_unlock(&privroot->d_inode->i_mutex); | |
1005 | } | |
48b32a35 | 1006 | |
a72bdb1c | 1007 | error: |
bd4c625c | 1008 | if (err) { |
bd4c625c LT |
1009 | clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt)); |
1010 | clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt)); | |
1011 | } | |
1012 | ||
1013 | /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */ | |
bd4c625c LT |
1014 | if (reiserfs_posixacl(s)) |
1015 | s->s_flags |= MS_POSIXACL; | |
ab17c4f0 | 1016 | else |
ab17c4f0 | 1017 | s->s_flags &= ~MS_POSIXACL; |
bd4c625c LT |
1018 | |
1019 | return err; | |
1da177e4 | 1020 | } |