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> |
47f70d08 | 53 | #include <linux/posix_acl_xattr.h> |
1da177e4 | 54 | |
1da177e4 LT |
55 | #define PRIVROOT_NAME ".reiserfs_priv" |
56 | #define XAROOT_NAME "xattrs" | |
57 | ||
1da177e4 | 58 | |
6c17675e JM |
59 | /* Helpers for inode ops. We do this so that we don't have all the VFS |
60 | * overhead and also for proper i_mutex annotation. | |
61 | * dir->i_mutex must be held for all of them. */ | |
3a355cc6 | 62 | #ifdef CONFIG_REISERFS_FS_XATTR |
6c17675e | 63 | static int xattr_create(struct inode *dir, struct dentry *dentry, int mode) |
1da177e4 | 64 | { |
6c17675e | 65 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
ebfc3b49 | 66 | return dir->i_op->create(dir, dentry, mode, true); |
6c17675e | 67 | } |
3a355cc6 | 68 | #endif |
bd4c625c | 69 | |
18bb1db3 | 70 | static int xattr_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
6c17675e JM |
71 | { |
72 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); | |
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)); | |
bd4c625c | 84 | |
4c05141d | 85 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD); |
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 | |
4c05141d | 99 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD); |
6c17675e JM |
100 | error = dir->i_op->rmdir(dir, dentry); |
101 | if (!error) | |
102 | dentry->d_inode->i_flags |= S_DEAD; | |
103 | mutex_unlock(&dentry->d_inode->i_mutex); | |
104 | if (!error) | |
105 | d_delete(dentry); | |
6c17675e JM |
106 | |
107 | return error; | |
108 | } | |
109 | ||
6c17675e JM |
110 | #define xattr_may_create(flags) (!flags || flags & XATTR_CREATE) |
111 | ||
ab17c4f0 | 112 | static struct dentry *open_xa_root(struct super_block *sb, int flags) |
6c17675e | 113 | { |
ab17c4f0 JM |
114 | struct dentry *privroot = REISERFS_SB(sb)->priv_root; |
115 | struct dentry *xaroot; | |
116 | if (!privroot->d_inode) | |
117 | return ERR_PTR(-ENODATA); | |
6c17675e | 118 | |
ab17c4f0 | 119 | mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR); |
6c17675e | 120 | |
ab17c4f0 | 121 | xaroot = dget(REISERFS_SB(sb)->xattr_root); |
ceb5edc4 JM |
122 | if (!xaroot) |
123 | xaroot = ERR_PTR(-ENODATA); | |
124 | else if (!xaroot->d_inode) { | |
ab17c4f0 | 125 | int err = -ENODATA; |
5a6059c3 | 126 | if (xattr_may_create(flags)) |
ab17c4f0 | 127 | err = xattr_mkdir(privroot->d_inode, xaroot, 0700); |
9b7f3755 | 128 | if (err) { |
ab17c4f0 JM |
129 | dput(xaroot); |
130 | xaroot = ERR_PTR(err); | |
9b7f3755 | 131 | } |
bd4c625c | 132 | } |
6c17675e | 133 | |
ab17c4f0 JM |
134 | mutex_unlock(&privroot->d_inode->i_mutex); |
135 | return xaroot; | |
1da177e4 LT |
136 | } |
137 | ||
bd4c625c | 138 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
1da177e4 | 139 | { |
bd4c625c LT |
140 | struct dentry *xaroot, *xadir; |
141 | char namebuf[17]; | |
142 | ||
6c17675e | 143 | xaroot = open_xa_root(inode->i_sb, flags); |
9b7f3755 | 144 | if (IS_ERR(xaroot)) |
bd4c625c | 145 | return xaroot; |
bd4c625c | 146 | |
bd4c625c LT |
147 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
148 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), | |
149 | inode->i_generation); | |
bd4c625c | 150 | |
ab17c4f0 JM |
151 | mutex_lock_nested(&xaroot->d_inode->i_mutex, I_MUTEX_XATTR); |
152 | ||
153 | xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf)); | |
154 | if (!IS_ERR(xadir) && !xadir->d_inode) { | |
155 | int err = -ENODATA; | |
156 | if (xattr_may_create(flags)) | |
157 | err = xattr_mkdir(xaroot->d_inode, xadir, 0700); | |
158 | if (err) { | |
159 | dput(xadir); | |
160 | xadir = ERR_PTR(err); | |
161 | } | |
162 | } | |
163 | ||
164 | mutex_unlock(&xaroot->d_inode->i_mutex); | |
bd4c625c LT |
165 | dput(xaroot); |
166 | return xadir; | |
1da177e4 LT |
167 | } |
168 | ||
48b32a35 JM |
169 | /* The following are side effects of other operations that aren't explicitly |
170 | * modifying extended attributes. This includes operations such as permissions | |
171 | * or ownership changes, object deletions, etc. */ | |
a41f1a47 | 172 | struct reiserfs_dentry_buf { |
4acf381e | 173 | struct dir_context ctx; |
a41f1a47 JM |
174 | struct dentry *xadir; |
175 | int count; | |
176 | struct dentry *dentries[8]; | |
177 | }; | |
bd4c625c | 178 | |
a72bdb1c | 179 | static int |
a41f1a47 JM |
180 | fill_with_dentries(void *buf, const char *name, int namelen, loff_t offset, |
181 | u64 ino, unsigned int d_type) | |
a72bdb1c | 182 | { |
a41f1a47 | 183 | struct reiserfs_dentry_buf *dbuf = buf; |
a72bdb1c | 184 | struct dentry *dentry; |
5a6059c3 | 185 | WARN_ON_ONCE(!mutex_is_locked(&dbuf->xadir->d_inode->i_mutex)); |
bd4c625c | 186 | |
a41f1a47 JM |
187 | if (dbuf->count == ARRAY_SIZE(dbuf->dentries)) |
188 | return -ENOSPC; | |
bd4c625c | 189 | |
35e5cbc0 JK |
190 | if (name[0] == '.' && (namelen < 2 || |
191 | (namelen == 2 && name[1] == '.'))) | |
a41f1a47 | 192 | return 0; |
bd4c625c | 193 | |
a41f1a47 | 194 | dentry = lookup_one_len(name, dbuf->xadir, namelen); |
a72bdb1c | 195 | if (IS_ERR(dentry)) { |
a41f1a47 | 196 | return PTR_ERR(dentry); |
a72bdb1c | 197 | } else if (!dentry->d_inode) { |
a41f1a47 JM |
198 | /* A directory entry exists, but no file? */ |
199 | reiserfs_error(dentry->d_sb, "xattr-20003", | |
200 | "Corrupted directory: xattr %s listed but " | |
201 | "not found for file %s.\n", | |
202 | dentry->d_name.name, dbuf->xadir->d_name.name); | |
203 | dput(dentry); | |
204 | return -EIO; | |
bd4c625c | 205 | } |
1da177e4 | 206 | |
a41f1a47 JM |
207 | dbuf->dentries[dbuf->count++] = dentry; |
208 | return 0; | |
1da177e4 LT |
209 | } |
210 | ||
a41f1a47 JM |
211 | static void |
212 | cleanup_dentry_buf(struct reiserfs_dentry_buf *buf) | |
1da177e4 | 213 | { |
a41f1a47 JM |
214 | int i; |
215 | for (i = 0; i < buf->count; i++) | |
216 | if (buf->dentries[i]) | |
217 | dput(buf->dentries[i]); | |
a72bdb1c JM |
218 | } |
219 | ||
a41f1a47 JM |
220 | static int reiserfs_for_each_xattr(struct inode *inode, |
221 | int (*action)(struct dentry *, void *), | |
222 | void *data) | |
a72bdb1c | 223 | { |
a41f1a47 JM |
224 | struct dentry *dir; |
225 | int i, err = 0; | |
a41f1a47 | 226 | struct reiserfs_dentry_buf buf = { |
4acf381e | 227 | .ctx.actor = fill_with_dentries, |
a41f1a47 | 228 | }; |
1da177e4 | 229 | |
a72bdb1c JM |
230 | /* Skip out, an xattr has no xattrs associated with it */ |
231 | if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1) | |
232 | return 0; | |
1da177e4 | 233 | |
6c17675e | 234 | dir = open_xa_dir(inode, XATTR_REPLACE); |
a72bdb1c JM |
235 | if (IS_ERR(dir)) { |
236 | err = PTR_ERR(dir); | |
237 | goto out; | |
238 | } else if (!dir->d_inode) { | |
a41f1a47 JM |
239 | err = 0; |
240 | goto out_dir; | |
a72bdb1c | 241 | } |
1da177e4 | 242 | |
6c17675e | 243 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
27026a05 | 244 | |
a41f1a47 | 245 | buf.xadir = dir; |
cd62cdae AV |
246 | while (1) { |
247 | err = reiserfs_readdir_inode(dir->d_inode, &buf.ctx); | |
248 | if (err) | |
249 | break; | |
250 | if (!buf.count) | |
251 | break; | |
252 | for (i = 0; !err && i < buf.count && buf.dentries[i]; i++) { | |
a41f1a47 | 253 | struct dentry *dentry = buf.dentries[i]; |
1da177e4 | 254 | |
cd62cdae AV |
255 | if (!S_ISDIR(dentry->d_inode->i_mode)) |
256 | err = action(dentry, data); | |
1da177e4 | 257 | |
a41f1a47 JM |
258 | dput(dentry); |
259 | buf.dentries[i] = NULL; | |
bd4c625c | 260 | } |
cd62cdae AV |
261 | if (err) |
262 | break; | |
a41f1a47 | 263 | buf.count = 0; |
8b6dd72a | 264 | } |
a41f1a47 | 265 | mutex_unlock(&dir->d_inode->i_mutex); |
1da177e4 | 266 | |
a41f1a47 | 267 | cleanup_dentry_buf(&buf); |
1da177e4 | 268 | |
d984561b | 269 | if (!err) { |
a41f1a47 JM |
270 | /* We start a transaction here to avoid a ABBA situation |
271 | * between the xattr root's i_mutex and the journal lock. | |
272 | * This doesn't incur much additional overhead since the | |
273 | * new transaction will just nest inside the | |
274 | * outer transaction. */ | |
275 | int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + | |
276 | 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); | |
277 | struct reiserfs_transaction_handle th; | |
4c05141d | 278 | reiserfs_write_lock(inode->i_sb); |
a41f1a47 | 279 | err = journal_begin(&th, inode->i_sb, blocks); |
4c05141d | 280 | reiserfs_write_unlock(inode->i_sb); |
a41f1a47 JM |
281 | if (!err) { |
282 | int jerror; | |
4c05141d JM |
283 | mutex_lock_nested(&dir->d_parent->d_inode->i_mutex, |
284 | I_MUTEX_XATTR); | |
a41f1a47 | 285 | err = action(dir, data); |
4c05141d | 286 | reiserfs_write_lock(inode->i_sb); |
a41f1a47 | 287 | jerror = journal_end(&th, inode->i_sb, blocks); |
4c05141d | 288 | reiserfs_write_unlock(inode->i_sb); |
a41f1a47 JM |
289 | mutex_unlock(&dir->d_parent->d_inode->i_mutex); |
290 | err = jerror ?: err; | |
291 | } | |
a72bdb1c | 292 | } |
a41f1a47 JM |
293 | out_dir: |
294 | dput(dir); | |
a72bdb1c | 295 | out: |
a41f1a47 JM |
296 | /* -ENODATA isn't an error */ |
297 | if (err == -ENODATA) | |
298 | err = 0; | |
a72bdb1c JM |
299 | return err; |
300 | } | |
1da177e4 | 301 | |
a41f1a47 | 302 | static int delete_one_xattr(struct dentry *dentry, void *data) |
a72bdb1c | 303 | { |
a41f1a47 | 304 | struct inode *dir = dentry->d_parent->d_inode; |
1da177e4 | 305 | |
a41f1a47 JM |
306 | /* This is the xattr dir, handle specially. */ |
307 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
308 | return xattr_rmdir(dir, dentry); | |
1da177e4 | 309 | |
a41f1a47 JM |
310 | return xattr_unlink(dir, dentry); |
311 | } | |
bd4c625c | 312 | |
a41f1a47 JM |
313 | static int chown_one_xattr(struct dentry *dentry, void *data) |
314 | { | |
315 | struct iattr *attrs = data; | |
4a857011 JM |
316 | int ia_valid = attrs->ia_valid; |
317 | int err; | |
318 | ||
319 | /* | |
320 | * We only want the ownership bits. Otherwise, we'll do | |
321 | * things like change a directory to a regular file if | |
322 | * ATTR_MODE is set. | |
323 | */ | |
324 | attrs->ia_valid &= (ATTR_UID|ATTR_GID); | |
325 | err = reiserfs_setattr(dentry, attrs); | |
326 | attrs->ia_valid = ia_valid; | |
327 | ||
328 | return err; | |
a41f1a47 | 329 | } |
1da177e4 | 330 | |
a41f1a47 JM |
331 | /* No i_mutex, but the inode is unconnected. */ |
332 | int reiserfs_delete_xattrs(struct inode *inode) | |
333 | { | |
334 | int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); | |
335 | if (err) | |
336 | reiserfs_warning(inode->i_sb, "jdm-20004", | |
337 | "Couldn't delete all xattrs (%d)\n", err); | |
a72bdb1c JM |
338 | return err; |
339 | } | |
1da177e4 | 340 | |
a41f1a47 | 341 | /* inode->i_mutex: down */ |
a72bdb1c JM |
342 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
343 | { | |
a41f1a47 | 344 | int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); |
8b6dd72a JM |
345 | if (err) |
346 | reiserfs_warning(inode->i_sb, "jdm-20007", | |
347 | "Couldn't chown all xattrs (%d)\n", err); | |
a72bdb1c | 348 | return err; |
1da177e4 LT |
349 | } |
350 | ||
a72bdb1c | 351 | #ifdef CONFIG_REISERFS_FS_XATTR |
a72bdb1c JM |
352 | /* Returns a dentry corresponding to a specific extended attribute file |
353 | * for the inode. If flags allow, the file is created. Otherwise, a | |
354 | * valid or negative dentry, or an error is returned. */ | |
48b32a35 JM |
355 | static struct dentry *xattr_lookup(struct inode *inode, const char *name, |
356 | int flags) | |
1da177e4 | 357 | { |
a72bdb1c JM |
358 | struct dentry *xadir, *xafile; |
359 | int err = 0; | |
360 | ||
361 | xadir = open_xa_dir(inode, flags); | |
6c17675e | 362 | if (IS_ERR(xadir)) |
a72bdb1c | 363 | return ERR_CAST(xadir); |
a72bdb1c | 364 | |
5a6059c3 | 365 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
a72bdb1c JM |
366 | xafile = lookup_one_len(name, xadir, strlen(name)); |
367 | if (IS_ERR(xafile)) { | |
6c17675e JM |
368 | err = PTR_ERR(xafile); |
369 | goto out; | |
bd4c625c | 370 | } |
a72bdb1c | 371 | |
6c17675e JM |
372 | if (xafile->d_inode && (flags & XATTR_CREATE)) |
373 | err = -EEXIST; | |
a72bdb1c | 374 | |
6c17675e JM |
375 | if (!xafile->d_inode) { |
376 | err = -ENODATA; | |
5a6059c3 | 377 | if (xattr_may_create(flags)) |
6c17675e JM |
378 | err = xattr_create(xadir->d_inode, xafile, |
379 | 0700|S_IFREG); | |
a72bdb1c JM |
380 | } |
381 | ||
6c17675e JM |
382 | if (err) |
383 | dput(xafile); | |
a72bdb1c | 384 | out: |
5a6059c3 | 385 | mutex_unlock(&xadir->d_inode->i_mutex); |
a72bdb1c JM |
386 | dput(xadir); |
387 | if (err) | |
6c17675e | 388 | return ERR_PTR(err); |
a72bdb1c | 389 | return xafile; |
1da177e4 LT |
390 | } |
391 | ||
1da177e4 | 392 | /* Internal operations on file data */ |
bd4c625c | 393 | static inline void reiserfs_put_page(struct page *page) |
1da177e4 | 394 | { |
bd4c625c LT |
395 | kunmap(page); |
396 | page_cache_release(page); | |
1da177e4 LT |
397 | } |
398 | ||
ec6ea56b | 399 | static struct page *reiserfs_get_page(struct inode *dir, size_t n) |
1da177e4 | 400 | { |
bd4c625c LT |
401 | struct address_space *mapping = dir->i_mapping; |
402 | struct page *page; | |
403 | /* We can deadlock if we try to free dentries, | |
25985edc | 404 | and an unlink/rmdir has just occurred - GFP_NOFS avoids this */ |
c4cdd038 | 405 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
ec6ea56b | 406 | page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL); |
bd4c625c | 407 | if (!IS_ERR(page)) { |
bd4c625c | 408 | kmap(page); |
bd4c625c LT |
409 | if (PageError(page)) |
410 | goto fail; | |
411 | } | |
412 | return page; | |
413 | ||
414 | fail: | |
415 | reiserfs_put_page(page); | |
416 | return ERR_PTR(-EIO); | |
1da177e4 LT |
417 | } |
418 | ||
bd4c625c | 419 | static inline __u32 xattr_hash(const char *msg, int len) |
1da177e4 | 420 | { |
bd4c625c | 421 | return csum_partial(msg, len, 0); |
1da177e4 LT |
422 | } |
423 | ||
ba9d8cec VS |
424 | int reiserfs_commit_write(struct file *f, struct page *page, |
425 | unsigned from, unsigned to); | |
ba9d8cec | 426 | |
48b32a35 JM |
427 | static void update_ctime(struct inode *inode) |
428 | { | |
429 | struct timespec now = current_fs_time(inode->i_sb); | |
1d3382cb | 430 | if (inode_unhashed(inode) || !inode->i_nlink || |
48b32a35 JM |
431 | timespec_equal(&inode->i_ctime, &now)) |
432 | return; | |
433 | ||
434 | inode->i_ctime = CURRENT_TIME_SEC; | |
435 | mark_inode_dirty(inode); | |
436 | } | |
437 | ||
438 | static int lookup_and_delete_xattr(struct inode *inode, const char *name) | |
439 | { | |
440 | int err = 0; | |
441 | struct dentry *dentry, *xadir; | |
442 | ||
443 | xadir = open_xa_dir(inode, XATTR_REPLACE); | |
444 | if (IS_ERR(xadir)) | |
445 | return PTR_ERR(xadir); | |
446 | ||
5a6059c3 | 447 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
48b32a35 JM |
448 | dentry = lookup_one_len(name, xadir, strlen(name)); |
449 | if (IS_ERR(dentry)) { | |
450 | err = PTR_ERR(dentry); | |
451 | goto out_dput; | |
452 | } | |
453 | ||
454 | if (dentry->d_inode) { | |
48b32a35 | 455 | err = xattr_unlink(xadir->d_inode, dentry); |
48b32a35 JM |
456 | update_ctime(inode); |
457 | } | |
458 | ||
459 | dput(dentry); | |
460 | out_dput: | |
5a6059c3 | 461 | mutex_unlock(&xadir->d_inode->i_mutex); |
48b32a35 JM |
462 | dput(xadir); |
463 | return err; | |
464 | } | |
465 | ||
ba9d8cec | 466 | |
1da177e4 LT |
467 | /* Generic extended attribute operations that can be used by xa plugins */ |
468 | ||
469 | /* | |
1b1dcc1b | 470 | * inode->i_mutex: down |
1da177e4 LT |
471 | */ |
472 | int | |
0ab2621e JM |
473 | reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, |
474 | struct inode *inode, const char *name, | |
475 | const void *buffer, size_t buffer_size, int flags) | |
1da177e4 | 476 | { |
bd4c625c | 477 | int err = 0; |
3227e14c | 478 | struct dentry *dentry; |
bd4c625c LT |
479 | struct page *page; |
480 | char *data; | |
bd4c625c LT |
481 | size_t file_pos = 0; |
482 | size_t buffer_pos = 0; | |
48b32a35 | 483 | size_t new_size; |
bd4c625c LT |
484 | __u32 xahash = 0; |
485 | ||
bd4c625c LT |
486 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
487 | return -EOPNOTSUPP; | |
488 | ||
4f3be1b5 FW |
489 | if (!buffer) { |
490 | err = lookup_and_delete_xattr(inode, name); | |
4f3be1b5 FW |
491 | return err; |
492 | } | |
493 | ||
48b32a35 | 494 | dentry = xattr_lookup(inode, name, flags); |
4c05141d | 495 | if (IS_ERR(dentry)) |
48b32a35 | 496 | return PTR_ERR(dentry); |
3f14fea6 | 497 | |
f3e22f48 | 498 | down_write(&REISERFS_I(inode)->i_xattr_sem); |
bd4c625c | 499 | |
8b6dd72a | 500 | xahash = xattr_hash(buffer, buffer_size); |
bd4c625c LT |
501 | while (buffer_pos < buffer_size || buffer_pos == 0) { |
502 | size_t chunk; | |
503 | size_t skip = 0; | |
504 | size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1)); | |
505 | if (buffer_size - buffer_pos > PAGE_CACHE_SIZE) | |
506 | chunk = PAGE_CACHE_SIZE; | |
507 | else | |
508 | chunk = buffer_size - buffer_pos; | |
509 | ||
ec6ea56b | 510 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
511 | if (IS_ERR(page)) { |
512 | err = PTR_ERR(page); | |
48b32a35 | 513 | goto out_unlock; |
bd4c625c LT |
514 | } |
515 | ||
516 | lock_page(page); | |
517 | data = page_address(page); | |
518 | ||
519 | if (file_pos == 0) { | |
520 | struct reiserfs_xattr_header *rxh; | |
521 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
522 | if (chunk + skip > PAGE_CACHE_SIZE) | |
523 | chunk = PAGE_CACHE_SIZE - skip; | |
524 | rxh = (struct reiserfs_xattr_header *)data; | |
525 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); | |
526 | rxh->h_hash = cpu_to_le32(xahash); | |
527 | } | |
528 | ||
4c05141d | 529 | reiserfs_write_lock(inode->i_sb); |
ebdec241 | 530 | err = __reiserfs_write_begin(page, page_offset, chunk + skip); |
bd4c625c LT |
531 | if (!err) { |
532 | if (buffer) | |
533 | memcpy(data + skip, buffer + buffer_pos, chunk); | |
3227e14c JM |
534 | err = reiserfs_commit_write(NULL, page, page_offset, |
535 | page_offset + chunk + | |
536 | skip); | |
bd4c625c | 537 | } |
4c05141d | 538 | reiserfs_write_unlock(inode->i_sb); |
bd4c625c LT |
539 | unlock_page(page); |
540 | reiserfs_put_page(page); | |
541 | buffer_pos += chunk; | |
542 | file_pos += chunk; | |
543 | skip = 0; | |
544 | if (err || buffer_size == 0 || !buffer) | |
545 | break; | |
546 | } | |
547 | ||
48b32a35 JM |
548 | new_size = buffer_size + sizeof(struct reiserfs_xattr_header); |
549 | if (!err && new_size < i_size_read(dentry->d_inode)) { | |
550 | struct iattr newattrs = { | |
551 | .ia_ctime = current_fs_time(inode->i_sb), | |
fb2162df | 552 | .ia_size = new_size, |
48b32a35 JM |
553 | .ia_valid = ATTR_SIZE | ATTR_CTIME, |
554 | }; | |
31370f62 | 555 | |
48b32a35 | 556 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR); |
bd5fe6c5 | 557 | inode_dio_wait(dentry->d_inode); |
31370f62 | 558 | |
48b32a35 | 559 | err = reiserfs_setattr(dentry, &newattrs); |
48b32a35 JM |
560 | mutex_unlock(&dentry->d_inode->i_mutex); |
561 | } else | |
562 | update_ctime(inode); | |
563 | out_unlock: | |
8b6dd72a | 564 | up_write(&REISERFS_I(inode)->i_xattr_sem); |
3227e14c | 565 | dput(dentry); |
48b32a35 JM |
566 | return err; |
567 | } | |
bd4c625c | 568 | |
0ab2621e JM |
569 | /* We need to start a transaction to maintain lock ordering */ |
570 | int reiserfs_xattr_set(struct inode *inode, const char *name, | |
571 | const void *buffer, size_t buffer_size, int flags) | |
48b32a35 | 572 | { |
0ab2621e JM |
573 | |
574 | struct reiserfs_transaction_handle th; | |
575 | int error, error2; | |
576 | size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size); | |
577 | ||
578 | if (!(flags & XATTR_REPLACE)) | |
579 | jbegin_count += reiserfs_xattr_jcreate_nblocks(inode); | |
580 | ||
581 | reiserfs_write_lock(inode->i_sb); | |
582 | error = journal_begin(&th, inode->i_sb, jbegin_count); | |
4c05141d | 583 | reiserfs_write_unlock(inode->i_sb); |
0ab2621e | 584 | if (error) { |
0ab2621e | 585 | return error; |
1da177e4 | 586 | } |
bd4c625c | 587 | |
0ab2621e JM |
588 | error = reiserfs_xattr_set_handle(&th, inode, name, |
589 | buffer, buffer_size, flags); | |
bd4c625c | 590 | |
4c05141d | 591 | reiserfs_write_lock(inode->i_sb); |
0ab2621e | 592 | error2 = journal_end(&th, inode->i_sb, jbegin_count); |
4c05141d | 593 | reiserfs_write_unlock(inode->i_sb); |
0ab2621e JM |
594 | if (error == 0) |
595 | error = error2; | |
0ab2621e JM |
596 | |
597 | return error; | |
1da177e4 LT |
598 | } |
599 | ||
600 | /* | |
1b1dcc1b | 601 | * inode->i_mutex: down |
1da177e4 LT |
602 | */ |
603 | int | |
48b32a35 | 604 | reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, |
bd4c625c | 605 | size_t buffer_size) |
1da177e4 | 606 | { |
bd4c625c | 607 | ssize_t err = 0; |
3227e14c | 608 | struct dentry *dentry; |
bd4c625c LT |
609 | size_t isize; |
610 | size_t file_pos = 0; | |
611 | size_t buffer_pos = 0; | |
612 | struct page *page; | |
bd4c625c LT |
613 | __u32 hash = 0; |
614 | ||
615 | if (name == NULL) | |
616 | return -EINVAL; | |
617 | ||
618 | /* We can't have xattrs attached to v1 items since they don't have | |
619 | * generation numbers */ | |
620 | if (get_inode_sd_version(inode) == STAT_DATA_V1) | |
621 | return -EOPNOTSUPP; | |
622 | ||
48b32a35 | 623 | dentry = xattr_lookup(inode, name, XATTR_REPLACE); |
3227e14c JM |
624 | if (IS_ERR(dentry)) { |
625 | err = PTR_ERR(dentry); | |
bd4c625c LT |
626 | goto out; |
627 | } | |
628 | ||
8b6dd72a | 629 | down_read(&REISERFS_I(inode)->i_xattr_sem); |
d984561b | 630 | |
f437c529 | 631 | isize = i_size_read(dentry->d_inode); |
bd4c625c LT |
632 | |
633 | /* Just return the size needed */ | |
634 | if (buffer == NULL) { | |
635 | err = isize - sizeof(struct reiserfs_xattr_header); | |
8b6dd72a | 636 | goto out_unlock; |
bd4c625c LT |
637 | } |
638 | ||
639 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { | |
640 | err = -ERANGE; | |
8b6dd72a | 641 | goto out_unlock; |
bd4c625c LT |
642 | } |
643 | ||
644 | while (file_pos < isize) { | |
645 | size_t chunk; | |
646 | char *data; | |
647 | size_t skip = 0; | |
648 | if (isize - file_pos > PAGE_CACHE_SIZE) | |
649 | chunk = PAGE_CACHE_SIZE; | |
650 | else | |
651 | chunk = isize - file_pos; | |
652 | ||
a72bdb1c | 653 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
654 | if (IS_ERR(page)) { |
655 | err = PTR_ERR(page); | |
8b6dd72a | 656 | goto out_unlock; |
bd4c625c LT |
657 | } |
658 | ||
659 | lock_page(page); | |
660 | data = page_address(page); | |
661 | if (file_pos == 0) { | |
662 | struct reiserfs_xattr_header *rxh = | |
663 | (struct reiserfs_xattr_header *)data; | |
664 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
665 | chunk -= skip; | |
666 | /* Magic doesn't match up.. */ | |
667 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { | |
668 | unlock_page(page); | |
669 | reiserfs_put_page(page); | |
a72bdb1c | 670 | reiserfs_warning(inode->i_sb, "jdm-20001", |
bd4c625c LT |
671 | "Invalid magic for xattr (%s) " |
672 | "associated with %k", name, | |
673 | INODE_PKEY(inode)); | |
674 | err = -EIO; | |
8b6dd72a | 675 | goto out_unlock; |
bd4c625c LT |
676 | } |
677 | hash = le32_to_cpu(rxh->h_hash); | |
678 | } | |
679 | memcpy(buffer + buffer_pos, data + skip, chunk); | |
680 | unlock_page(page); | |
681 | reiserfs_put_page(page); | |
682 | file_pos += chunk; | |
683 | buffer_pos += chunk; | |
684 | skip = 0; | |
685 | } | |
686 | err = isize - sizeof(struct reiserfs_xattr_header); | |
687 | ||
688 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != | |
689 | hash) { | |
a72bdb1c | 690 | reiserfs_warning(inode->i_sb, "jdm-20002", |
bd4c625c LT |
691 | "Invalid hash for xattr (%s) associated " |
692 | "with %k", name, INODE_PKEY(inode)); | |
693 | err = -EIO; | |
694 | } | |
695 | ||
8b6dd72a JM |
696 | out_unlock: |
697 | up_read(&REISERFS_I(inode)->i_xattr_sem); | |
3227e14c | 698 | dput(dentry); |
bd4c625c | 699 | |
a72bdb1c | 700 | out: |
bd4c625c | 701 | return err; |
1da177e4 LT |
702 | } |
703 | ||
48b32a35 JM |
704 | /* |
705 | * In order to implement different sets of xattr operations for each xattr | |
706 | * prefix with the generic xattr API, a filesystem should create a | |
707 | * null-terminated array of struct xattr_handler (one for each prefix) and | |
708 | * hang a pointer to it off of the s_xattr field of the superblock. | |
709 | * | |
710 | * The generic_fooxattr() functions will use this list to dispatch xattr | |
711 | * operations to the correct xattr_handler. | |
712 | */ | |
713 | #define for_each_xattr_handler(handlers, handler) \ | |
714 | for ((handler) = *(handlers)++; \ | |
715 | (handler) != NULL; \ | |
716 | (handler) = *(handlers)++) | |
1da177e4 | 717 | |
48b32a35 | 718 | /* This is the implementation for the xattr plugin infrastructure */ |
94d09a98 SH |
719 | static inline const struct xattr_handler * |
720 | find_xattr_handler_prefix(const struct xattr_handler **handlers, | |
48b32a35 | 721 | const char *name) |
1da177e4 | 722 | { |
94d09a98 | 723 | const struct xattr_handler *xah; |
bd4c625c | 724 | |
48b32a35 JM |
725 | if (!handlers) |
726 | return NULL; | |
bd4c625c | 727 | |
48b32a35 JM |
728 | for_each_xattr_handler(handlers, xah) { |
729 | if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0) | |
730 | break; | |
bd4c625c LT |
731 | } |
732 | ||
48b32a35 | 733 | return xah; |
bd4c625c | 734 | } |
1da177e4 | 735 | |
1da177e4 LT |
736 | |
737 | /* | |
738 | * Inode operation getxattr() | |
1da177e4 LT |
739 | */ |
740 | ssize_t | |
bd4c625c LT |
741 | reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, |
742 | size_t size) | |
1da177e4 | 743 | { |
94d09a98 | 744 | const struct xattr_handler *handler; |
bd4c625c | 745 | |
431547b3 | 746 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 747 | |
431547b3 | 748 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c LT |
749 | return -EOPNOTSUPP; |
750 | ||
431547b3 | 751 | return handler->get(dentry, name, buffer, size, handler->flags); |
1da177e4 LT |
752 | } |
753 | ||
1da177e4 LT |
754 | /* |
755 | * Inode operation setxattr() | |
756 | * | |
1b1dcc1b | 757 | * dentry->d_inode->i_mutex down |
1da177e4 LT |
758 | */ |
759 | int | |
bd4c625c LT |
760 | reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
761 | size_t size, int flags) | |
1da177e4 | 762 | { |
94d09a98 | 763 | const struct xattr_handler *handler; |
bd4c625c | 764 | |
431547b3 | 765 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 766 | |
431547b3 | 767 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c LT |
768 | return -EOPNOTSUPP; |
769 | ||
431547b3 | 770 | return handler->set(dentry, name, value, size, flags, handler->flags); |
1da177e4 LT |
771 | } |
772 | ||
773 | /* | |
774 | * Inode operation removexattr() | |
775 | * | |
1b1dcc1b | 776 | * dentry->d_inode->i_mutex down |
1da177e4 | 777 | */ |
bd4c625c | 778 | int reiserfs_removexattr(struct dentry *dentry, const char *name) |
1da177e4 | 779 | { |
94d09a98 | 780 | const struct xattr_handler *handler; |
431547b3 | 781 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
1da177e4 | 782 | |
431547b3 | 783 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c | 784 | return -EOPNOTSUPP; |
1da177e4 | 785 | |
431547b3 | 786 | return handler->set(dentry, name, NULL, 0, XATTR_REPLACE, handler->flags); |
1da177e4 LT |
787 | } |
788 | ||
48b32a35 | 789 | struct listxattr_buf { |
4acf381e | 790 | struct dir_context ctx; |
48b32a35 JM |
791 | size_t size; |
792 | size_t pos; | |
793 | char *buf; | |
431547b3 | 794 | struct dentry *dentry; |
1da177e4 LT |
795 | }; |
796 | ||
48b32a35 JM |
797 | static int listxattr_filler(void *buf, const char *name, int namelen, |
798 | loff_t offset, u64 ino, unsigned int d_type) | |
1da177e4 | 799 | { |
48b32a35 JM |
800 | struct listxattr_buf *b = (struct listxattr_buf *)buf; |
801 | size_t size; | |
802 | if (name[0] != '.' || | |
803 | (namelen != 1 && (name[1] != '.' || namelen != 2))) { | |
94d09a98 | 804 | const struct xattr_handler *handler; |
431547b3 | 805 | handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr, |
48b32a35 JM |
806 | name); |
807 | if (!handler) /* Unsupported xattr name */ | |
808 | return 0; | |
809 | if (b->buf) { | |
431547b3 CH |
810 | size = handler->list(b->dentry, b->buf + b->pos, |
811 | b->size, name, namelen, | |
812 | handler->flags); | |
48b32a35 JM |
813 | if (size > b->size) |
814 | return -ERANGE; | |
815 | } else { | |
431547b3 CH |
816 | size = handler->list(b->dentry, NULL, 0, name, |
817 | namelen, handler->flags); | |
bd4c625c | 818 | } |
bd4c625c | 819 | |
48b32a35 JM |
820 | b->pos += size; |
821 | } | |
bd4c625c | 822 | return 0; |
1da177e4 | 823 | } |
bd4c625c | 824 | |
1da177e4 LT |
825 | /* |
826 | * Inode operation listxattr() | |
827 | * | |
48b32a35 JM |
828 | * We totally ignore the generic listxattr here because it would be stupid |
829 | * not to. Since the xattrs are organized in a directory, we can just | |
830 | * readdir to find them. | |
1da177e4 | 831 | */ |
bd4c625c | 832 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
1da177e4 | 833 | { |
bd4c625c LT |
834 | struct dentry *dir; |
835 | int err = 0; | |
48b32a35 | 836 | struct listxattr_buf buf = { |
4acf381e | 837 | .ctx.actor = listxattr_filler, |
431547b3 | 838 | .dentry = dentry, |
48b32a35 JM |
839 | .buf = buffer, |
840 | .size = buffer ? size : 0, | |
841 | }; | |
bd4c625c LT |
842 | |
843 | if (!dentry->d_inode) | |
844 | return -EINVAL; | |
845 | ||
677c9b2e | 846 | if (!dentry->d_sb->s_xattr || |
bd4c625c LT |
847 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
848 | return -EOPNOTSUPP; | |
849 | ||
6c17675e | 850 | dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE); |
bd4c625c LT |
851 | if (IS_ERR(dir)) { |
852 | err = PTR_ERR(dir); | |
853 | if (err == -ENODATA) | |
48b32a35 | 854 | err = 0; /* Not an error if there aren't any xattrs */ |
bd4c625c LT |
855 | goto out; |
856 | } | |
857 | ||
6c17675e | 858 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
cd62cdae | 859 | err = reiserfs_readdir_inode(dir->d_inode, &buf.ctx); |
6c17675e | 860 | mutex_unlock(&dir->d_inode->i_mutex); |
bd4c625c | 861 | |
48b32a35 JM |
862 | if (!err) |
863 | err = buf.pos; | |
bd4c625c | 864 | |
3227e14c | 865 | dput(dir); |
8b6dd72a | 866 | out: |
bd4c625c | 867 | return err; |
1da177e4 LT |
868 | } |
869 | ||
a72bdb1c | 870 | static int create_privroot(struct dentry *dentry) |
1da177e4 | 871 | { |
a72bdb1c JM |
872 | int err; |
873 | struct inode *inode = dentry->d_parent->d_inode; | |
5a6059c3 JM |
874 | WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex)); |
875 | ||
6c17675e | 876 | err = xattr_mkdir(inode, dentry, 0700); |
edcc37a0 AV |
877 | if (err || !dentry->d_inode) { |
878 | reiserfs_warning(dentry->d_sb, "jdm-20006", | |
879 | "xattrs/ACLs enabled and couldn't " | |
880 | "find/create .reiserfs_priv. " | |
881 | "Failing mount."); | |
882 | return -EOPNOTSUPP; | |
bd4c625c LT |
883 | } |
884 | ||
edcc37a0 AV |
885 | dentry->d_inode->i_flags |= S_PRIVATE; |
886 | reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr " | |
887 | "storage.\n", PRIVROOT_NAME); | |
bd4c625c | 888 | |
edcc37a0 | 889 | return 0; |
1da177e4 LT |
890 | } |
891 | ||
12abb35a JM |
892 | #else |
893 | int __init reiserfs_xattr_register_handlers(void) { return 0; } | |
894 | void reiserfs_xattr_unregister_handlers(void) {} | |
895 | static int create_privroot(struct dentry *dentry) { return 0; } | |
896 | #endif | |
897 | ||
898 | /* Actual operations that are exported to VFS-land */ | |
da02eb72 | 899 | static const struct xattr_handler *reiserfs_xattr_handlers[] = { |
12abb35a JM |
900 | #ifdef CONFIG_REISERFS_FS_XATTR |
901 | &reiserfs_xattr_user_handler, | |
902 | &reiserfs_xattr_trusted_handler, | |
903 | #endif | |
904 | #ifdef CONFIG_REISERFS_FS_SECURITY | |
905 | &reiserfs_xattr_security_handler, | |
906 | #endif | |
907 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL | |
47f70d08 CH |
908 | &posix_acl_access_xattr_handler, |
909 | &posix_acl_default_xattr_handler, | |
12abb35a JM |
910 | #endif |
911 | NULL | |
912 | }; | |
913 | ||
a72bdb1c | 914 | static int xattr_mount_check(struct super_block *s) |
1da177e4 | 915 | { |
a72bdb1c JM |
916 | /* We need generation numbers to ensure that the oid mapping is correct |
917 | * v3.5 filesystems don't have them. */ | |
48b32a35 JM |
918 | if (old_format_only(s)) { |
919 | if (reiserfs_xattrs_optional(s)) { | |
920 | /* Old format filesystem, but optional xattrs have | |
921 | * been enabled. Error out. */ | |
922 | reiserfs_warning(s, "jdm-2005", | |
923 | "xattrs/ACLs not supported " | |
924 | "on pre-v3.6 format filesystems. " | |
925 | "Failing mount."); | |
926 | return -EOPNOTSUPP; | |
927 | } | |
a72bdb1c JM |
928 | } |
929 | ||
930 | return 0; | |
1da177e4 LT |
931 | } |
932 | ||
10556cb2 | 933 | int reiserfs_permission(struct inode *inode, int mask) |
b83674c0 JM |
934 | { |
935 | /* | |
936 | * We don't do permission checks on the internal objects. | |
937 | * Permissions are determined by the "owning" object. | |
938 | */ | |
939 | if (IS_PRIVATE(inode)) | |
940 | return 0; | |
941 | ||
2830ba7f | 942 | return generic_permission(inode, mask); |
b83674c0 JM |
943 | } |
944 | ||
0b728e19 | 945 | static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 946 | { |
cac36f70 | 947 | return -EPERM; |
1da177e4 LT |
948 | } |
949 | ||
e16404ed | 950 | static const struct dentry_operations xattr_lookup_poison_ops = { |
cac36f70 | 951 | .d_revalidate = xattr_hide_revalidate, |
1da177e4 LT |
952 | }; |
953 | ||
edcc37a0 AV |
954 | int reiserfs_lookup_privroot(struct super_block *s) |
955 | { | |
956 | struct dentry *dentry; | |
957 | int err = 0; | |
958 | ||
959 | /* If we don't have the privroot located yet - go find it */ | |
4c05141d | 960 | mutex_lock(&s->s_root->d_inode->i_mutex); |
edcc37a0 AV |
961 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, |
962 | strlen(PRIVROOT_NAME)); | |
963 | if (!IS_ERR(dentry)) { | |
964 | REISERFS_SB(s)->priv_root = dentry; | |
fb045adb | 965 | d_set_d_op(dentry, &xattr_lookup_poison_ops); |
edcc37a0 AV |
966 | if (dentry->d_inode) |
967 | dentry->d_inode->i_flags |= S_PRIVATE; | |
968 | } else | |
969 | err = PTR_ERR(dentry); | |
970 | mutex_unlock(&s->s_root->d_inode->i_mutex); | |
971 | ||
972 | return err; | |
973 | } | |
974 | ||
1da177e4 LT |
975 | /* We need to take a copy of the mount flags since things like |
976 | * MS_RDONLY don't get set until *after* we're called. | |
977 | * mount_flags != mount_options */ | |
bd4c625c | 978 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
1da177e4 | 979 | { |
bd4c625c | 980 | int err = 0; |
ab17c4f0 | 981 | struct dentry *privroot = REISERFS_SB(s)->priv_root; |
bd4c625c | 982 | |
a72bdb1c JM |
983 | err = xattr_mount_check(s); |
984 | if (err) | |
bd4c625c | 985 | goto error; |
bd4c625c | 986 | |
ab17c4f0 | 987 | if (!privroot->d_inode && !(mount_flags & MS_RDONLY)) { |
4c05141d | 988 | mutex_lock(&s->s_root->d_inode->i_mutex); |
edcc37a0 | 989 | err = create_privroot(REISERFS_SB(s)->priv_root); |
5a6059c3 | 990 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
bd4c625c | 991 | } |
ab17c4f0 JM |
992 | |
993 | if (privroot->d_inode) { | |
48b32a35 | 994 | s->s_xattr = reiserfs_xattr_handlers; |
4c05141d | 995 | mutex_lock(&privroot->d_inode->i_mutex); |
ab17c4f0 JM |
996 | if (!REISERFS_SB(s)->xattr_root) { |
997 | struct dentry *dentry; | |
998 | dentry = lookup_one_len(XAROOT_NAME, privroot, | |
999 | strlen(XAROOT_NAME)); | |
1000 | if (!IS_ERR(dentry)) | |
1001 | REISERFS_SB(s)->xattr_root = dentry; | |
1002 | else | |
1003 | err = PTR_ERR(dentry); | |
1004 | } | |
1005 | mutex_unlock(&privroot->d_inode->i_mutex); | |
1006 | } | |
48b32a35 | 1007 | |
a72bdb1c | 1008 | error: |
bd4c625c | 1009 | if (err) { |
bd4c625c LT |
1010 | clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt)); |
1011 | clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt)); | |
1012 | } | |
1013 | ||
1014 | /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */ | |
bd4c625c LT |
1015 | if (reiserfs_posixacl(s)) |
1016 | s->s_flags |= MS_POSIXACL; | |
ab17c4f0 | 1017 | else |
ab17c4f0 | 1018 | s->s_flags &= ~MS_POSIXACL; |
bd4c625c LT |
1019 | |
1020 | return err; | |
1da177e4 | 1021 | } |