Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/reiserfs/xattr.c | |
3 | * | |
4 | * Copyright (c) 2002 by Jeff Mahoney, <jeffm@suse.com> | |
5 | * | |
6 | */ | |
7 | ||
8 | /* | |
9 | * In order to implement EA/ACLs in a clean, backwards compatible manner, | |
10 | * they are implemented as files in a "private" directory. | |
11 | * Each EA is in it's own file, with the directory layout like so (/ is assumed | |
12 | * to be relative to fs root). Inside the /.reiserfs_priv/xattrs directory, | |
13 | * directories named using the capital-hex form of the objectid and | |
14 | * generation number are used. Inside each directory are individual files | |
15 | * named with the name of the extended attribute. | |
16 | * | |
17 | * So, for objectid 12648430, we could have: | |
18 | * /.reiserfs_priv/xattrs/C0FFEE.0/system.posix_acl_access | |
19 | * /.reiserfs_priv/xattrs/C0FFEE.0/system.posix_acl_default | |
20 | * /.reiserfs_priv/xattrs/C0FFEE.0/user.Content-Type | |
21 | * .. or similar. | |
22 | * | |
23 | * The file contents are the text of the EA. The size is known based on the | |
24 | * stat data describing the file. | |
25 | * | |
26 | * In the case of system.posix_acl_access and system.posix_acl_default, since | |
27 | * these are special cases for filesystem ACLs, they are interpreted by the | |
28 | * kernel, in addition, they are negatively and positively cached and attached | |
29 | * to the inode so that unnecessary lookups are avoided. | |
d984561b JM |
30 | * |
31 | * Locking works like so: | |
8b6dd72a JM |
32 | * Directory components (xattr root, xattr dir) are protectd by their i_mutex. |
33 | * The xattrs themselves are protected by the xattr_sem. | |
1da177e4 LT |
34 | */ |
35 | ||
36 | #include <linux/reiserfs_fs.h> | |
16f7e0fe | 37 | #include <linux/capability.h> |
1da177e4 LT |
38 | #include <linux/dcache.h> |
39 | #include <linux/namei.h> | |
40 | #include <linux/errno.h> | |
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> | |
46 | #include <linux/reiserfs_xattr.h> | |
47 | #include <linux/reiserfs_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)); |
6c17675e JM |
65 | return dir->i_op->create(dir, dentry, mode, NULL); |
66 | } | |
3a355cc6 | 67 | #endif |
bd4c625c | 68 | |
6c17675e JM |
69 | static int xattr_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
70 | { | |
71 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); | |
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 JM |
173 | struct reiserfs_dentry_buf { |
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 | |
a41f1a47 JM |
190 | if (name[0] == '.' && (name[1] == '\0' || |
191 | (name[1] == '.' && name[2] == '\0'))) | |
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; | |
226 | loff_t pos = 0; | |
227 | struct reiserfs_dentry_buf buf = { | |
228 | .count = 0, | |
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 JM |
251 | buf.xadir = dir; |
252 | err = reiserfs_readdir_dentry(dir, &buf, fill_with_dentries, &pos); | |
253 | while ((err == 0 || err == -ENOSPC) && buf.count) { | |
254 | err = 0; | |
1da177e4 | 255 | |
a41f1a47 JM |
256 | for (i = 0; i < buf.count && buf.dentries[i]; i++) { |
257 | int lerr = 0; | |
258 | struct dentry *dentry = buf.dentries[i]; | |
1da177e4 | 259 | |
a41f1a47 JM |
260 | if (err == 0 && !S_ISDIR(dentry->d_inode->i_mode)) |
261 | lerr = action(dentry, data); | |
1da177e4 | 262 | |
a41f1a47 JM |
263 | dput(dentry); |
264 | buf.dentries[i] = NULL; | |
265 | err = lerr ?: err; | |
bd4c625c | 266 | } |
a41f1a47 JM |
267 | buf.count = 0; |
268 | if (!err) | |
269 | err = reiserfs_readdir_dentry(dir, &buf, | |
270 | fill_with_dentries, &pos); | |
8b6dd72a | 271 | } |
a41f1a47 | 272 | mutex_unlock(&dir->d_inode->i_mutex); |
1da177e4 | 273 | |
a41f1a47 JM |
274 | /* Clean up after a failed readdir */ |
275 | cleanup_dentry_buf(&buf); | |
1da177e4 | 276 | |
d984561b | 277 | if (!err) { |
a41f1a47 JM |
278 | /* We start a transaction here to avoid a ABBA situation |
279 | * between the xattr root's i_mutex and the journal lock. | |
280 | * This doesn't incur much additional overhead since the | |
281 | * new transaction will just nest inside the | |
282 | * outer transaction. */ | |
283 | int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + | |
284 | 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); | |
285 | struct reiserfs_transaction_handle th; | |
286 | err = journal_begin(&th, inode->i_sb, blocks); | |
287 | if (!err) { | |
288 | int jerror; | |
8b513f56 FW |
289 | reiserfs_mutex_lock_nested_safe( |
290 | &dir->d_parent->d_inode->i_mutex, | |
291 | I_MUTEX_XATTR, inode->i_sb); | |
a41f1a47 JM |
292 | err = action(dir, data); |
293 | jerror = journal_end(&th, inode->i_sb, blocks); | |
294 | mutex_unlock(&dir->d_parent->d_inode->i_mutex); | |
295 | err = jerror ?: err; | |
296 | } | |
a72bdb1c | 297 | } |
a41f1a47 JM |
298 | out_dir: |
299 | dput(dir); | |
a72bdb1c | 300 | out: |
a41f1a47 JM |
301 | /* -ENODATA isn't an error */ |
302 | if (err == -ENODATA) | |
303 | err = 0; | |
a72bdb1c JM |
304 | return err; |
305 | } | |
1da177e4 | 306 | |
a41f1a47 | 307 | static int delete_one_xattr(struct dentry *dentry, void *data) |
a72bdb1c | 308 | { |
a41f1a47 | 309 | struct inode *dir = dentry->d_parent->d_inode; |
1da177e4 | 310 | |
a41f1a47 JM |
311 | /* This is the xattr dir, handle specially. */ |
312 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
313 | return xattr_rmdir(dir, dentry); | |
1da177e4 | 314 | |
a41f1a47 JM |
315 | return xattr_unlink(dir, dentry); |
316 | } | |
bd4c625c | 317 | |
a41f1a47 JM |
318 | static int chown_one_xattr(struct dentry *dentry, void *data) |
319 | { | |
320 | struct iattr *attrs = data; | |
321 | return reiserfs_setattr(dentry, attrs); | |
322 | } | |
1da177e4 | 323 | |
a41f1a47 JM |
324 | /* No i_mutex, but the inode is unconnected. */ |
325 | int reiserfs_delete_xattrs(struct inode *inode) | |
326 | { | |
327 | int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); | |
328 | if (err) | |
329 | reiserfs_warning(inode->i_sb, "jdm-20004", | |
330 | "Couldn't delete all xattrs (%d)\n", err); | |
a72bdb1c JM |
331 | return err; |
332 | } | |
1da177e4 | 333 | |
a41f1a47 | 334 | /* inode->i_mutex: down */ |
a72bdb1c JM |
335 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
336 | { | |
a41f1a47 | 337 | int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); |
8b6dd72a JM |
338 | if (err) |
339 | reiserfs_warning(inode->i_sb, "jdm-20007", | |
340 | "Couldn't chown all xattrs (%d)\n", err); | |
a72bdb1c | 341 | return err; |
1da177e4 LT |
342 | } |
343 | ||
a72bdb1c | 344 | #ifdef CONFIG_REISERFS_FS_XATTR |
a72bdb1c JM |
345 | /* Returns a dentry corresponding to a specific extended attribute file |
346 | * for the inode. If flags allow, the file is created. Otherwise, a | |
347 | * valid or negative dentry, or an error is returned. */ | |
48b32a35 JM |
348 | static struct dentry *xattr_lookup(struct inode *inode, const char *name, |
349 | int flags) | |
1da177e4 | 350 | { |
a72bdb1c JM |
351 | struct dentry *xadir, *xafile; |
352 | int err = 0; | |
353 | ||
354 | xadir = open_xa_dir(inode, flags); | |
6c17675e | 355 | if (IS_ERR(xadir)) |
a72bdb1c | 356 | return ERR_CAST(xadir); |
a72bdb1c | 357 | |
5a6059c3 | 358 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
a72bdb1c JM |
359 | xafile = lookup_one_len(name, xadir, strlen(name)); |
360 | if (IS_ERR(xafile)) { | |
6c17675e JM |
361 | err = PTR_ERR(xafile); |
362 | goto out; | |
bd4c625c | 363 | } |
a72bdb1c | 364 | |
6c17675e JM |
365 | if (xafile->d_inode && (flags & XATTR_CREATE)) |
366 | err = -EEXIST; | |
a72bdb1c | 367 | |
6c17675e JM |
368 | if (!xafile->d_inode) { |
369 | err = -ENODATA; | |
5a6059c3 | 370 | if (xattr_may_create(flags)) |
6c17675e JM |
371 | err = xattr_create(xadir->d_inode, xafile, |
372 | 0700|S_IFREG); | |
a72bdb1c JM |
373 | } |
374 | ||
6c17675e JM |
375 | if (err) |
376 | dput(xafile); | |
a72bdb1c | 377 | out: |
5a6059c3 | 378 | mutex_unlock(&xadir->d_inode->i_mutex); |
a72bdb1c JM |
379 | dput(xadir); |
380 | if (err) | |
6c17675e | 381 | return ERR_PTR(err); |
a72bdb1c | 382 | return xafile; |
1da177e4 LT |
383 | } |
384 | ||
1da177e4 | 385 | /* Internal operations on file data */ |
bd4c625c | 386 | static inline void reiserfs_put_page(struct page *page) |
1da177e4 | 387 | { |
bd4c625c LT |
388 | kunmap(page); |
389 | page_cache_release(page); | |
1da177e4 LT |
390 | } |
391 | ||
ec6ea56b | 392 | static struct page *reiserfs_get_page(struct inode *dir, size_t n) |
1da177e4 | 393 | { |
bd4c625c LT |
394 | struct address_space *mapping = dir->i_mapping; |
395 | struct page *page; | |
396 | /* We can deadlock if we try to free dentries, | |
25985edc | 397 | and an unlink/rmdir has just occurred - GFP_NOFS avoids this */ |
c4cdd038 | 398 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
ec6ea56b | 399 | page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL); |
bd4c625c | 400 | if (!IS_ERR(page)) { |
bd4c625c | 401 | kmap(page); |
bd4c625c LT |
402 | if (PageError(page)) |
403 | goto fail; | |
404 | } | |
405 | return page; | |
406 | ||
407 | fail: | |
408 | reiserfs_put_page(page); | |
409 | return ERR_PTR(-EIO); | |
1da177e4 LT |
410 | } |
411 | ||
bd4c625c | 412 | static inline __u32 xattr_hash(const char *msg, int len) |
1da177e4 | 413 | { |
bd4c625c | 414 | return csum_partial(msg, len, 0); |
1da177e4 LT |
415 | } |
416 | ||
ba9d8cec VS |
417 | int reiserfs_commit_write(struct file *f, struct page *page, |
418 | unsigned from, unsigned to); | |
ba9d8cec | 419 | |
48b32a35 JM |
420 | static void update_ctime(struct inode *inode) |
421 | { | |
422 | struct timespec now = current_fs_time(inode->i_sb); | |
1d3382cb | 423 | if (inode_unhashed(inode) || !inode->i_nlink || |
48b32a35 JM |
424 | timespec_equal(&inode->i_ctime, &now)) |
425 | return; | |
426 | ||
427 | inode->i_ctime = CURRENT_TIME_SEC; | |
428 | mark_inode_dirty(inode); | |
429 | } | |
430 | ||
431 | static int lookup_and_delete_xattr(struct inode *inode, const char *name) | |
432 | { | |
433 | int err = 0; | |
434 | struct dentry *dentry, *xadir; | |
435 | ||
436 | xadir = open_xa_dir(inode, XATTR_REPLACE); | |
437 | if (IS_ERR(xadir)) | |
438 | return PTR_ERR(xadir); | |
439 | ||
5a6059c3 | 440 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
48b32a35 JM |
441 | dentry = lookup_one_len(name, xadir, strlen(name)); |
442 | if (IS_ERR(dentry)) { | |
443 | err = PTR_ERR(dentry); | |
444 | goto out_dput; | |
445 | } | |
446 | ||
447 | if (dentry->d_inode) { | |
4f3be1b5 | 448 | reiserfs_write_lock(inode->i_sb); |
48b32a35 | 449 | err = xattr_unlink(xadir->d_inode, dentry); |
4f3be1b5 | 450 | reiserfs_write_unlock(inode->i_sb); |
48b32a35 JM |
451 | update_ctime(inode); |
452 | } | |
453 | ||
454 | dput(dentry); | |
455 | out_dput: | |
5a6059c3 | 456 | mutex_unlock(&xadir->d_inode->i_mutex); |
48b32a35 JM |
457 | dput(xadir); |
458 | return err; | |
459 | } | |
460 | ||
ba9d8cec | 461 | |
1da177e4 LT |
462 | /* Generic extended attribute operations that can be used by xa plugins */ |
463 | ||
464 | /* | |
1b1dcc1b | 465 | * inode->i_mutex: down |
1da177e4 LT |
466 | */ |
467 | int | |
0ab2621e JM |
468 | reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, |
469 | struct inode *inode, const char *name, | |
470 | const void *buffer, size_t buffer_size, int flags) | |
1da177e4 | 471 | { |
bd4c625c | 472 | int err = 0; |
3227e14c | 473 | struct dentry *dentry; |
bd4c625c LT |
474 | struct page *page; |
475 | char *data; | |
bd4c625c LT |
476 | size_t file_pos = 0; |
477 | size_t buffer_pos = 0; | |
48b32a35 | 478 | size_t new_size; |
bd4c625c LT |
479 | __u32 xahash = 0; |
480 | ||
bd4c625c LT |
481 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
482 | return -EOPNOTSUPP; | |
483 | ||
3f14fea6 | 484 | reiserfs_write_unlock(inode->i_sb); |
4f3be1b5 FW |
485 | |
486 | if (!buffer) { | |
487 | err = lookup_and_delete_xattr(inode, name); | |
488 | reiserfs_write_lock(inode->i_sb); | |
489 | return err; | |
490 | } | |
491 | ||
48b32a35 | 492 | dentry = xattr_lookup(inode, name, flags); |
3f14fea6 FW |
493 | if (IS_ERR(dentry)) { |
494 | reiserfs_write_lock(inode->i_sb); | |
48b32a35 | 495 | return PTR_ERR(dentry); |
3f14fea6 FW |
496 | } |
497 | ||
f3e22f48 | 498 | down_write(&REISERFS_I(inode)->i_xattr_sem); |
bd4c625c | 499 | |
3f14fea6 | 500 | reiserfs_write_lock(inode->i_sb); |
bd4c625c | 501 | |
8b6dd72a | 502 | xahash = xattr_hash(buffer, buffer_size); |
bd4c625c LT |
503 | while (buffer_pos < buffer_size || buffer_pos == 0) { |
504 | size_t chunk; | |
505 | size_t skip = 0; | |
506 | size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1)); | |
507 | if (buffer_size - buffer_pos > PAGE_CACHE_SIZE) | |
508 | chunk = PAGE_CACHE_SIZE; | |
509 | else | |
510 | chunk = buffer_size - buffer_pos; | |
511 | ||
ec6ea56b | 512 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
513 | if (IS_ERR(page)) { |
514 | err = PTR_ERR(page); | |
48b32a35 | 515 | goto out_unlock; |
bd4c625c LT |
516 | } |
517 | ||
518 | lock_page(page); | |
519 | data = page_address(page); | |
520 | ||
521 | if (file_pos == 0) { | |
522 | struct reiserfs_xattr_header *rxh; | |
523 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
524 | if (chunk + skip > PAGE_CACHE_SIZE) | |
525 | chunk = PAGE_CACHE_SIZE - skip; | |
526 | rxh = (struct reiserfs_xattr_header *)data; | |
527 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); | |
528 | rxh->h_hash = cpu_to_le32(xahash); | |
529 | } | |
530 | ||
ebdec241 | 531 | err = __reiserfs_write_begin(page, page_offset, chunk + skip); |
bd4c625c LT |
532 | if (!err) { |
533 | if (buffer) | |
534 | memcpy(data + skip, buffer + buffer_pos, chunk); | |
3227e14c JM |
535 | err = reiserfs_commit_write(NULL, page, page_offset, |
536 | page_offset + chunk + | |
537 | skip); | |
bd4c625c LT |
538 | } |
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 FW |
555 | |
556 | reiserfs_write_unlock(inode->i_sb); | |
48b32a35 JM |
557 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR); |
558 | down_write(&dentry->d_inode->i_alloc_sem); | |
31370f62 FW |
559 | reiserfs_write_lock(inode->i_sb); |
560 | ||
48b32a35 JM |
561 | err = reiserfs_setattr(dentry, &newattrs); |
562 | up_write(&dentry->d_inode->i_alloc_sem); | |
563 | mutex_unlock(&dentry->d_inode->i_mutex); | |
564 | } else | |
565 | update_ctime(inode); | |
566 | out_unlock: | |
8b6dd72a | 567 | up_write(&REISERFS_I(inode)->i_xattr_sem); |
3227e14c | 568 | dput(dentry); |
48b32a35 JM |
569 | return err; |
570 | } | |
bd4c625c | 571 | |
0ab2621e JM |
572 | /* We need to start a transaction to maintain lock ordering */ |
573 | int reiserfs_xattr_set(struct inode *inode, const char *name, | |
574 | const void *buffer, size_t buffer_size, int flags) | |
48b32a35 | 575 | { |
0ab2621e JM |
576 | |
577 | struct reiserfs_transaction_handle th; | |
578 | int error, error2; | |
579 | size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size); | |
580 | ||
581 | if (!(flags & XATTR_REPLACE)) | |
582 | jbegin_count += reiserfs_xattr_jcreate_nblocks(inode); | |
583 | ||
584 | reiserfs_write_lock(inode->i_sb); | |
585 | error = journal_begin(&th, inode->i_sb, jbegin_count); | |
586 | if (error) { | |
587 | reiserfs_write_unlock(inode->i_sb); | |
588 | return error; | |
1da177e4 | 589 | } |
bd4c625c | 590 | |
0ab2621e JM |
591 | error = reiserfs_xattr_set_handle(&th, inode, name, |
592 | buffer, buffer_size, flags); | |
bd4c625c | 593 | |
0ab2621e JM |
594 | error2 = journal_end(&th, inode->i_sb, jbegin_count); |
595 | if (error == 0) | |
596 | error = error2; | |
597 | reiserfs_write_unlock(inode->i_sb); | |
598 | ||
599 | return error; | |
1da177e4 LT |
600 | } |
601 | ||
602 | /* | |
1b1dcc1b | 603 | * inode->i_mutex: down |
1da177e4 LT |
604 | */ |
605 | int | |
48b32a35 | 606 | reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, |
bd4c625c | 607 | size_t buffer_size) |
1da177e4 | 608 | { |
bd4c625c | 609 | ssize_t err = 0; |
3227e14c | 610 | struct dentry *dentry; |
bd4c625c LT |
611 | size_t isize; |
612 | size_t file_pos = 0; | |
613 | size_t buffer_pos = 0; | |
614 | struct page *page; | |
bd4c625c LT |
615 | __u32 hash = 0; |
616 | ||
617 | if (name == NULL) | |
618 | return -EINVAL; | |
619 | ||
620 | /* We can't have xattrs attached to v1 items since they don't have | |
621 | * generation numbers */ | |
622 | if (get_inode_sd_version(inode) == STAT_DATA_V1) | |
623 | return -EOPNOTSUPP; | |
624 | ||
48b32a35 | 625 | dentry = xattr_lookup(inode, name, XATTR_REPLACE); |
3227e14c JM |
626 | if (IS_ERR(dentry)) { |
627 | err = PTR_ERR(dentry); | |
bd4c625c LT |
628 | goto out; |
629 | } | |
630 | ||
8b6dd72a | 631 | down_read(&REISERFS_I(inode)->i_xattr_sem); |
d984561b | 632 | |
f437c529 | 633 | isize = i_size_read(dentry->d_inode); |
bd4c625c LT |
634 | |
635 | /* Just return the size needed */ | |
636 | if (buffer == NULL) { | |
637 | err = isize - sizeof(struct reiserfs_xattr_header); | |
8b6dd72a | 638 | goto out_unlock; |
bd4c625c LT |
639 | } |
640 | ||
641 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { | |
642 | err = -ERANGE; | |
8b6dd72a | 643 | goto out_unlock; |
bd4c625c LT |
644 | } |
645 | ||
646 | while (file_pos < isize) { | |
647 | size_t chunk; | |
648 | char *data; | |
649 | size_t skip = 0; | |
650 | if (isize - file_pos > PAGE_CACHE_SIZE) | |
651 | chunk = PAGE_CACHE_SIZE; | |
652 | else | |
653 | chunk = isize - file_pos; | |
654 | ||
a72bdb1c | 655 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
656 | if (IS_ERR(page)) { |
657 | err = PTR_ERR(page); | |
8b6dd72a | 658 | goto out_unlock; |
bd4c625c LT |
659 | } |
660 | ||
661 | lock_page(page); | |
662 | data = page_address(page); | |
663 | if (file_pos == 0) { | |
664 | struct reiserfs_xattr_header *rxh = | |
665 | (struct reiserfs_xattr_header *)data; | |
666 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
667 | chunk -= skip; | |
668 | /* Magic doesn't match up.. */ | |
669 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { | |
670 | unlock_page(page); | |
671 | reiserfs_put_page(page); | |
a72bdb1c | 672 | reiserfs_warning(inode->i_sb, "jdm-20001", |
bd4c625c LT |
673 | "Invalid magic for xattr (%s) " |
674 | "associated with %k", name, | |
675 | INODE_PKEY(inode)); | |
676 | err = -EIO; | |
8b6dd72a | 677 | goto out_unlock; |
bd4c625c LT |
678 | } |
679 | hash = le32_to_cpu(rxh->h_hash); | |
680 | } | |
681 | memcpy(buffer + buffer_pos, data + skip, chunk); | |
682 | unlock_page(page); | |
683 | reiserfs_put_page(page); | |
684 | file_pos += chunk; | |
685 | buffer_pos += chunk; | |
686 | skip = 0; | |
687 | } | |
688 | err = isize - sizeof(struct reiserfs_xattr_header); | |
689 | ||
690 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != | |
691 | hash) { | |
a72bdb1c | 692 | reiserfs_warning(inode->i_sb, "jdm-20002", |
bd4c625c LT |
693 | "Invalid hash for xattr (%s) associated " |
694 | "with %k", name, INODE_PKEY(inode)); | |
695 | err = -EIO; | |
696 | } | |
697 | ||
8b6dd72a JM |
698 | out_unlock: |
699 | up_read(&REISERFS_I(inode)->i_xattr_sem); | |
3227e14c | 700 | dput(dentry); |
bd4c625c | 701 | |
a72bdb1c | 702 | out: |
bd4c625c | 703 | return err; |
1da177e4 LT |
704 | } |
705 | ||
48b32a35 JM |
706 | /* |
707 | * In order to implement different sets of xattr operations for each xattr | |
708 | * prefix with the generic xattr API, a filesystem should create a | |
709 | * null-terminated array of struct xattr_handler (one for each prefix) and | |
710 | * hang a pointer to it off of the s_xattr field of the superblock. | |
711 | * | |
712 | * The generic_fooxattr() functions will use this list to dispatch xattr | |
713 | * operations to the correct xattr_handler. | |
714 | */ | |
715 | #define for_each_xattr_handler(handlers, handler) \ | |
716 | for ((handler) = *(handlers)++; \ | |
717 | (handler) != NULL; \ | |
718 | (handler) = *(handlers)++) | |
1da177e4 | 719 | |
48b32a35 | 720 | /* This is the implementation for the xattr plugin infrastructure */ |
94d09a98 SH |
721 | static inline const struct xattr_handler * |
722 | find_xattr_handler_prefix(const struct xattr_handler **handlers, | |
48b32a35 | 723 | const char *name) |
1da177e4 | 724 | { |
94d09a98 | 725 | const struct xattr_handler *xah; |
bd4c625c | 726 | |
48b32a35 JM |
727 | if (!handlers) |
728 | return NULL; | |
bd4c625c | 729 | |
48b32a35 JM |
730 | for_each_xattr_handler(handlers, xah) { |
731 | if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0) | |
732 | break; | |
bd4c625c LT |
733 | } |
734 | ||
48b32a35 | 735 | return xah; |
bd4c625c | 736 | } |
1da177e4 | 737 | |
1da177e4 LT |
738 | |
739 | /* | |
740 | * Inode operation getxattr() | |
1da177e4 LT |
741 | */ |
742 | ssize_t | |
bd4c625c LT |
743 | reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, |
744 | size_t size) | |
1da177e4 | 745 | { |
94d09a98 | 746 | const struct xattr_handler *handler; |
bd4c625c | 747 | |
431547b3 | 748 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 749 | |
431547b3 | 750 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c LT |
751 | return -EOPNOTSUPP; |
752 | ||
431547b3 | 753 | return handler->get(dentry, name, buffer, size, handler->flags); |
1da177e4 LT |
754 | } |
755 | ||
1da177e4 LT |
756 | /* |
757 | * Inode operation setxattr() | |
758 | * | |
1b1dcc1b | 759 | * dentry->d_inode->i_mutex down |
1da177e4 LT |
760 | */ |
761 | int | |
bd4c625c LT |
762 | reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
763 | size_t size, int flags) | |
1da177e4 | 764 | { |
94d09a98 | 765 | const struct xattr_handler *handler; |
bd4c625c | 766 | |
431547b3 | 767 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 768 | |
431547b3 | 769 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c LT |
770 | return -EOPNOTSUPP; |
771 | ||
431547b3 | 772 | return handler->set(dentry, name, value, size, flags, handler->flags); |
1da177e4 LT |
773 | } |
774 | ||
775 | /* | |
776 | * Inode operation removexattr() | |
777 | * | |
1b1dcc1b | 778 | * dentry->d_inode->i_mutex down |
1da177e4 | 779 | */ |
bd4c625c | 780 | int reiserfs_removexattr(struct dentry *dentry, const char *name) |
1da177e4 | 781 | { |
94d09a98 | 782 | const struct xattr_handler *handler; |
431547b3 | 783 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
1da177e4 | 784 | |
431547b3 | 785 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c | 786 | return -EOPNOTSUPP; |
1da177e4 | 787 | |
431547b3 | 788 | return handler->set(dentry, name, NULL, 0, XATTR_REPLACE, handler->flags); |
1da177e4 LT |
789 | } |
790 | ||
48b32a35 JM |
791 | struct listxattr_buf { |
792 | size_t size; | |
793 | size_t pos; | |
794 | char *buf; | |
431547b3 | 795 | struct dentry *dentry; |
1da177e4 LT |
796 | }; |
797 | ||
48b32a35 JM |
798 | static int listxattr_filler(void *buf, const char *name, int namelen, |
799 | loff_t offset, u64 ino, unsigned int d_type) | |
1da177e4 | 800 | { |
48b32a35 JM |
801 | struct listxattr_buf *b = (struct listxattr_buf *)buf; |
802 | size_t size; | |
803 | if (name[0] != '.' || | |
804 | (namelen != 1 && (name[1] != '.' || namelen != 2))) { | |
94d09a98 | 805 | const struct xattr_handler *handler; |
431547b3 | 806 | handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr, |
48b32a35 JM |
807 | name); |
808 | if (!handler) /* Unsupported xattr name */ | |
809 | return 0; | |
810 | if (b->buf) { | |
431547b3 CH |
811 | size = handler->list(b->dentry, b->buf + b->pos, |
812 | b->size, name, namelen, | |
813 | handler->flags); | |
48b32a35 JM |
814 | if (size > b->size) |
815 | return -ERANGE; | |
816 | } else { | |
431547b3 CH |
817 | size = handler->list(b->dentry, NULL, 0, name, |
818 | namelen, handler->flags); | |
bd4c625c | 819 | } |
bd4c625c | 820 | |
48b32a35 JM |
821 | b->pos += size; |
822 | } | |
bd4c625c | 823 | return 0; |
1da177e4 | 824 | } |
bd4c625c | 825 | |
1da177e4 LT |
826 | /* |
827 | * Inode operation listxattr() | |
828 | * | |
48b32a35 JM |
829 | * We totally ignore the generic listxattr here because it would be stupid |
830 | * not to. Since the xattrs are organized in a directory, we can just | |
831 | * readdir to find them. | |
1da177e4 | 832 | */ |
bd4c625c | 833 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
1da177e4 | 834 | { |
bd4c625c LT |
835 | struct dentry *dir; |
836 | int err = 0; | |
a41f1a47 | 837 | loff_t pos = 0; |
48b32a35 | 838 | struct listxattr_buf buf = { |
431547b3 | 839 | .dentry = dentry, |
48b32a35 JM |
840 | .buf = buffer, |
841 | .size = buffer ? size : 0, | |
842 | }; | |
bd4c625c LT |
843 | |
844 | if (!dentry->d_inode) | |
845 | return -EINVAL; | |
846 | ||
677c9b2e | 847 | if (!dentry->d_sb->s_xattr || |
bd4c625c LT |
848 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
849 | return -EOPNOTSUPP; | |
850 | ||
6c17675e | 851 | dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE); |
bd4c625c LT |
852 | if (IS_ERR(dir)) { |
853 | err = PTR_ERR(dir); | |
854 | if (err == -ENODATA) | |
48b32a35 | 855 | err = 0; /* Not an error if there aren't any xattrs */ |
bd4c625c LT |
856 | goto out; |
857 | } | |
858 | ||
6c17675e | 859 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
a41f1a47 | 860 | err = reiserfs_readdir_dentry(dir, &buf, listxattr_filler, &pos); |
6c17675e | 861 | mutex_unlock(&dir->d_inode->i_mutex); |
bd4c625c | 862 | |
48b32a35 JM |
863 | if (!err) |
864 | err = buf.pos; | |
bd4c625c | 865 | |
3227e14c | 866 | dput(dir); |
8b6dd72a | 867 | out: |
bd4c625c | 868 | return err; |
1da177e4 LT |
869 | } |
870 | ||
7e40145e | 871 | int reiserfs_check_acl(struct inode *inode, int mask) |
1da177e4 | 872 | { |
a72bdb1c JM |
873 | struct posix_acl *acl; |
874 | int error = -EAGAIN; /* do regular unix permission checks by default */ | |
bd4c625c | 875 | |
178ea735 AV |
876 | /* |
877 | * Stat data v1 doesn't support ACLs. | |
878 | */ | |
879 | if (get_inode_sd_version(inode) == STAT_DATA_V1) | |
880 | return -EAGAIN; | |
881 | ||
9c2c7039 | 882 | if (mask & MAY_NOT_BLOCK) |
b74c79e9 NP |
883 | return -ECHILD; |
884 | ||
a72bdb1c JM |
885 | acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS); |
886 | ||
a72bdb1c JM |
887 | if (acl) { |
888 | if (!IS_ERR(acl)) { | |
889 | error = posix_acl_permission(inode, acl, mask); | |
890 | posix_acl_release(acl); | |
891 | } else if (PTR_ERR(acl) != -ENODATA) | |
892 | error = PTR_ERR(acl); | |
bd4c625c LT |
893 | } |
894 | ||
a72bdb1c | 895 | return error; |
1da177e4 LT |
896 | } |
897 | ||
a72bdb1c | 898 | static int create_privroot(struct dentry *dentry) |
1da177e4 | 899 | { |
a72bdb1c JM |
900 | int err; |
901 | struct inode *inode = dentry->d_parent->d_inode; | |
5a6059c3 JM |
902 | WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex)); |
903 | ||
6c17675e | 904 | err = xattr_mkdir(inode, dentry, 0700); |
edcc37a0 AV |
905 | if (err || !dentry->d_inode) { |
906 | reiserfs_warning(dentry->d_sb, "jdm-20006", | |
907 | "xattrs/ACLs enabled and couldn't " | |
908 | "find/create .reiserfs_priv. " | |
909 | "Failing mount."); | |
910 | return -EOPNOTSUPP; | |
bd4c625c LT |
911 | } |
912 | ||
edcc37a0 AV |
913 | dentry->d_inode->i_flags |= S_PRIVATE; |
914 | reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr " | |
915 | "storage.\n", PRIVROOT_NAME); | |
bd4c625c | 916 | |
edcc37a0 | 917 | return 0; |
1da177e4 LT |
918 | } |
919 | ||
12abb35a JM |
920 | #else |
921 | int __init reiserfs_xattr_register_handlers(void) { return 0; } | |
922 | void reiserfs_xattr_unregister_handlers(void) {} | |
923 | static int create_privroot(struct dentry *dentry) { return 0; } | |
924 | #endif | |
925 | ||
926 | /* Actual operations that are exported to VFS-land */ | |
94d09a98 | 927 | const struct xattr_handler *reiserfs_xattr_handlers[] = { |
12abb35a JM |
928 | #ifdef CONFIG_REISERFS_FS_XATTR |
929 | &reiserfs_xattr_user_handler, | |
930 | &reiserfs_xattr_trusted_handler, | |
931 | #endif | |
932 | #ifdef CONFIG_REISERFS_FS_SECURITY | |
933 | &reiserfs_xattr_security_handler, | |
934 | #endif | |
935 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL | |
936 | &reiserfs_posix_acl_access_handler, | |
937 | &reiserfs_posix_acl_default_handler, | |
938 | #endif | |
939 | NULL | |
940 | }; | |
941 | ||
a72bdb1c | 942 | static int xattr_mount_check(struct super_block *s) |
1da177e4 | 943 | { |
a72bdb1c JM |
944 | /* We need generation numbers to ensure that the oid mapping is correct |
945 | * v3.5 filesystems don't have them. */ | |
48b32a35 JM |
946 | if (old_format_only(s)) { |
947 | if (reiserfs_xattrs_optional(s)) { | |
948 | /* Old format filesystem, but optional xattrs have | |
949 | * been enabled. Error out. */ | |
950 | reiserfs_warning(s, "jdm-2005", | |
951 | "xattrs/ACLs not supported " | |
952 | "on pre-v3.6 format filesystems. " | |
953 | "Failing mount."); | |
954 | return -EOPNOTSUPP; | |
955 | } | |
a72bdb1c JM |
956 | } |
957 | ||
958 | return 0; | |
1da177e4 LT |
959 | } |
960 | ||
10556cb2 | 961 | int reiserfs_permission(struct inode *inode, int mask) |
b83674c0 JM |
962 | { |
963 | /* | |
964 | * We don't do permission checks on the internal objects. | |
965 | * Permissions are determined by the "owning" object. | |
966 | */ | |
967 | if (IS_PRIVATE(inode)) | |
968 | return 0; | |
969 | ||
2830ba7f | 970 | return generic_permission(inode, mask); |
b83674c0 JM |
971 | } |
972 | ||
cac36f70 | 973 | static int xattr_hide_revalidate(struct dentry *dentry, struct nameidata *nd) |
1da177e4 | 974 | { |
cac36f70 | 975 | return -EPERM; |
1da177e4 LT |
976 | } |
977 | ||
e16404ed | 978 | static const struct dentry_operations xattr_lookup_poison_ops = { |
cac36f70 | 979 | .d_revalidate = xattr_hide_revalidate, |
1da177e4 LT |
980 | }; |
981 | ||
edcc37a0 AV |
982 | int reiserfs_lookup_privroot(struct super_block *s) |
983 | { | |
984 | struct dentry *dentry; | |
985 | int err = 0; | |
986 | ||
987 | /* If we don't have the privroot located yet - go find it */ | |
c72e0575 | 988 | reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s); |
edcc37a0 AV |
989 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, |
990 | strlen(PRIVROOT_NAME)); | |
991 | if (!IS_ERR(dentry)) { | |
992 | REISERFS_SB(s)->priv_root = dentry; | |
fb045adb | 993 | d_set_d_op(dentry, &xattr_lookup_poison_ops); |
edcc37a0 AV |
994 | if (dentry->d_inode) |
995 | dentry->d_inode->i_flags |= S_PRIVATE; | |
996 | } else | |
997 | err = PTR_ERR(dentry); | |
998 | mutex_unlock(&s->s_root->d_inode->i_mutex); | |
999 | ||
1000 | return err; | |
1001 | } | |
1002 | ||
1da177e4 LT |
1003 | /* We need to take a copy of the mount flags since things like |
1004 | * MS_RDONLY don't get set until *after* we're called. | |
1005 | * mount_flags != mount_options */ | |
bd4c625c | 1006 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
1da177e4 | 1007 | { |
bd4c625c | 1008 | int err = 0; |
ab17c4f0 | 1009 | struct dentry *privroot = REISERFS_SB(s)->priv_root; |
bd4c625c | 1010 | |
a72bdb1c JM |
1011 | err = xattr_mount_check(s); |
1012 | if (err) | |
bd4c625c | 1013 | goto error; |
bd4c625c | 1014 | |
ab17c4f0 | 1015 | if (!privroot->d_inode && !(mount_flags & MS_RDONLY)) { |
ae635c0b | 1016 | reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s); |
edcc37a0 | 1017 | err = create_privroot(REISERFS_SB(s)->priv_root); |
5a6059c3 | 1018 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
bd4c625c | 1019 | } |
ab17c4f0 JM |
1020 | |
1021 | if (privroot->d_inode) { | |
48b32a35 | 1022 | s->s_xattr = reiserfs_xattr_handlers; |
c72e0575 | 1023 | reiserfs_mutex_lock_safe(&privroot->d_inode->i_mutex, s); |
ab17c4f0 JM |
1024 | if (!REISERFS_SB(s)->xattr_root) { |
1025 | struct dentry *dentry; | |
1026 | dentry = lookup_one_len(XAROOT_NAME, privroot, | |
1027 | strlen(XAROOT_NAME)); | |
1028 | if (!IS_ERR(dentry)) | |
1029 | REISERFS_SB(s)->xattr_root = dentry; | |
1030 | else | |
1031 | err = PTR_ERR(dentry); | |
1032 | } | |
1033 | mutex_unlock(&privroot->d_inode->i_mutex); | |
1034 | } | |
48b32a35 | 1035 | |
a72bdb1c | 1036 | error: |
bd4c625c | 1037 | if (err) { |
bd4c625c LT |
1038 | clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt)); |
1039 | clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt)); | |
1040 | } | |
1041 | ||
1042 | /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */ | |
bd4c625c LT |
1043 | if (reiserfs_posixacl(s)) |
1044 | s->s_flags |= MS_POSIXACL; | |
ab17c4f0 | 1045 | else |
ab17c4f0 | 1046 | s->s_flags &= ~MS_POSIXACL; |
bd4c625c LT |
1047 | |
1048 | return err; | |
1da177e4 | 1049 | } |