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 | dentry_unhash(dentry); |
102 | error = dir->i_op->rmdir(dir, dentry); | |
103 | if (!error) | |
104 | dentry->d_inode->i_flags |= S_DEAD; | |
105 | mutex_unlock(&dentry->d_inode->i_mutex); | |
106 | if (!error) | |
107 | d_delete(dentry); | |
108 | dput(dentry); | |
109 | ||
110 | return error; | |
111 | } | |
112 | ||
6c17675e JM |
113 | #define xattr_may_create(flags) (!flags || flags & XATTR_CREATE) |
114 | ||
ab17c4f0 | 115 | static struct dentry *open_xa_root(struct super_block *sb, int flags) |
6c17675e | 116 | { |
ab17c4f0 JM |
117 | struct dentry *privroot = REISERFS_SB(sb)->priv_root; |
118 | struct dentry *xaroot; | |
119 | if (!privroot->d_inode) | |
120 | return ERR_PTR(-ENODATA); | |
6c17675e | 121 | |
ab17c4f0 | 122 | mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR); |
6c17675e | 123 | |
ab17c4f0 | 124 | xaroot = dget(REISERFS_SB(sb)->xattr_root); |
ceb5edc4 JM |
125 | if (!xaroot) |
126 | xaroot = ERR_PTR(-ENODATA); | |
127 | else if (!xaroot->d_inode) { | |
ab17c4f0 | 128 | int err = -ENODATA; |
5a6059c3 | 129 | if (xattr_may_create(flags)) |
ab17c4f0 | 130 | err = xattr_mkdir(privroot->d_inode, xaroot, 0700); |
9b7f3755 | 131 | if (err) { |
ab17c4f0 JM |
132 | dput(xaroot); |
133 | xaroot = ERR_PTR(err); | |
9b7f3755 | 134 | } |
bd4c625c | 135 | } |
6c17675e | 136 | |
ab17c4f0 JM |
137 | mutex_unlock(&privroot->d_inode->i_mutex); |
138 | return xaroot; | |
1da177e4 LT |
139 | } |
140 | ||
bd4c625c | 141 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
1da177e4 | 142 | { |
bd4c625c LT |
143 | struct dentry *xaroot, *xadir; |
144 | char namebuf[17]; | |
145 | ||
6c17675e | 146 | xaroot = open_xa_root(inode->i_sb, flags); |
9b7f3755 | 147 | if (IS_ERR(xaroot)) |
bd4c625c | 148 | return xaroot; |
bd4c625c | 149 | |
bd4c625c LT |
150 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
151 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), | |
152 | inode->i_generation); | |
bd4c625c | 153 | |
ab17c4f0 JM |
154 | mutex_lock_nested(&xaroot->d_inode->i_mutex, I_MUTEX_XATTR); |
155 | ||
156 | xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf)); | |
157 | if (!IS_ERR(xadir) && !xadir->d_inode) { | |
158 | int err = -ENODATA; | |
159 | if (xattr_may_create(flags)) | |
160 | err = xattr_mkdir(xaroot->d_inode, xadir, 0700); | |
161 | if (err) { | |
162 | dput(xadir); | |
163 | xadir = ERR_PTR(err); | |
164 | } | |
165 | } | |
166 | ||
167 | mutex_unlock(&xaroot->d_inode->i_mutex); | |
bd4c625c LT |
168 | dput(xaroot); |
169 | return xadir; | |
1da177e4 LT |
170 | } |
171 | ||
48b32a35 JM |
172 | /* The following are side effects of other operations that aren't explicitly |
173 | * modifying extended attributes. This includes operations such as permissions | |
174 | * or ownership changes, object deletions, etc. */ | |
a41f1a47 JM |
175 | struct reiserfs_dentry_buf { |
176 | struct dentry *xadir; | |
177 | int count; | |
178 | struct dentry *dentries[8]; | |
179 | }; | |
bd4c625c | 180 | |
a72bdb1c | 181 | static int |
a41f1a47 JM |
182 | fill_with_dentries(void *buf, const char *name, int namelen, loff_t offset, |
183 | u64 ino, unsigned int d_type) | |
a72bdb1c | 184 | { |
a41f1a47 | 185 | struct reiserfs_dentry_buf *dbuf = buf; |
a72bdb1c | 186 | struct dentry *dentry; |
5a6059c3 | 187 | WARN_ON_ONCE(!mutex_is_locked(&dbuf->xadir->d_inode->i_mutex)); |
bd4c625c | 188 | |
a41f1a47 JM |
189 | if (dbuf->count == ARRAY_SIZE(dbuf->dentries)) |
190 | return -ENOSPC; | |
bd4c625c | 191 | |
a41f1a47 JM |
192 | if (name[0] == '.' && (name[1] == '\0' || |
193 | (name[1] == '.' && name[2] == '\0'))) | |
194 | return 0; | |
bd4c625c | 195 | |
a41f1a47 | 196 | dentry = lookup_one_len(name, dbuf->xadir, namelen); |
a72bdb1c | 197 | if (IS_ERR(dentry)) { |
a41f1a47 | 198 | return PTR_ERR(dentry); |
a72bdb1c | 199 | } else if (!dentry->d_inode) { |
a41f1a47 JM |
200 | /* A directory entry exists, but no file? */ |
201 | reiserfs_error(dentry->d_sb, "xattr-20003", | |
202 | "Corrupted directory: xattr %s listed but " | |
203 | "not found for file %s.\n", | |
204 | dentry->d_name.name, dbuf->xadir->d_name.name); | |
205 | dput(dentry); | |
206 | return -EIO; | |
bd4c625c | 207 | } |
1da177e4 | 208 | |
a41f1a47 JM |
209 | dbuf->dentries[dbuf->count++] = dentry; |
210 | return 0; | |
1da177e4 LT |
211 | } |
212 | ||
a41f1a47 JM |
213 | static void |
214 | cleanup_dentry_buf(struct reiserfs_dentry_buf *buf) | |
1da177e4 | 215 | { |
a41f1a47 JM |
216 | int i; |
217 | for (i = 0; i < buf->count; i++) | |
218 | if (buf->dentries[i]) | |
219 | dput(buf->dentries[i]); | |
a72bdb1c JM |
220 | } |
221 | ||
a41f1a47 JM |
222 | static int reiserfs_for_each_xattr(struct inode *inode, |
223 | int (*action)(struct dentry *, void *), | |
224 | void *data) | |
a72bdb1c | 225 | { |
a41f1a47 JM |
226 | struct dentry *dir; |
227 | int i, err = 0; | |
228 | loff_t pos = 0; | |
229 | struct reiserfs_dentry_buf buf = { | |
230 | .count = 0, | |
231 | }; | |
1da177e4 | 232 | |
a72bdb1c JM |
233 | /* Skip out, an xattr has no xattrs associated with it */ |
234 | if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1) | |
235 | return 0; | |
1da177e4 | 236 | |
27026a05 | 237 | reiserfs_write_unlock(inode->i_sb); |
6c17675e | 238 | dir = open_xa_dir(inode, XATTR_REPLACE); |
a72bdb1c JM |
239 | if (IS_ERR(dir)) { |
240 | err = PTR_ERR(dir); | |
27026a05 | 241 | reiserfs_write_lock(inode->i_sb); |
a72bdb1c JM |
242 | goto out; |
243 | } else if (!dir->d_inode) { | |
a41f1a47 | 244 | err = 0; |
27026a05 | 245 | reiserfs_write_lock(inode->i_sb); |
a41f1a47 | 246 | goto out_dir; |
a72bdb1c | 247 | } |
1da177e4 | 248 | |
6c17675e | 249 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
27026a05 FW |
250 | |
251 | reiserfs_write_lock(inode->i_sb); | |
252 | ||
a41f1a47 JM |
253 | buf.xadir = dir; |
254 | err = reiserfs_readdir_dentry(dir, &buf, fill_with_dentries, &pos); | |
255 | while ((err == 0 || err == -ENOSPC) && buf.count) { | |
256 | err = 0; | |
1da177e4 | 257 | |
a41f1a47 JM |
258 | for (i = 0; i < buf.count && buf.dentries[i]; i++) { |
259 | int lerr = 0; | |
260 | struct dentry *dentry = buf.dentries[i]; | |
1da177e4 | 261 | |
a41f1a47 JM |
262 | if (err == 0 && !S_ISDIR(dentry->d_inode->i_mode)) |
263 | lerr = action(dentry, data); | |
1da177e4 | 264 | |
a41f1a47 JM |
265 | dput(dentry); |
266 | buf.dentries[i] = NULL; | |
267 | err = lerr ?: err; | |
bd4c625c | 268 | } |
a41f1a47 JM |
269 | buf.count = 0; |
270 | if (!err) | |
271 | err = reiserfs_readdir_dentry(dir, &buf, | |
272 | fill_with_dentries, &pos); | |
8b6dd72a | 273 | } |
a41f1a47 | 274 | mutex_unlock(&dir->d_inode->i_mutex); |
1da177e4 | 275 | |
a41f1a47 JM |
276 | /* Clean up after a failed readdir */ |
277 | cleanup_dentry_buf(&buf); | |
1da177e4 | 278 | |
d984561b | 279 | if (!err) { |
a41f1a47 JM |
280 | /* We start a transaction here to avoid a ABBA situation |
281 | * between the xattr root's i_mutex and the journal lock. | |
282 | * This doesn't incur much additional overhead since the | |
283 | * new transaction will just nest inside the | |
284 | * outer transaction. */ | |
285 | int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + | |
286 | 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); | |
287 | struct reiserfs_transaction_handle th; | |
288 | err = journal_begin(&th, inode->i_sb, blocks); | |
289 | if (!err) { | |
290 | int jerror; | |
8b513f56 FW |
291 | reiserfs_mutex_lock_nested_safe( |
292 | &dir->d_parent->d_inode->i_mutex, | |
293 | I_MUTEX_XATTR, inode->i_sb); | |
a41f1a47 JM |
294 | err = action(dir, data); |
295 | jerror = journal_end(&th, inode->i_sb, blocks); | |
296 | mutex_unlock(&dir->d_parent->d_inode->i_mutex); | |
297 | err = jerror ?: err; | |
298 | } | |
a72bdb1c | 299 | } |
a41f1a47 JM |
300 | out_dir: |
301 | dput(dir); | |
a72bdb1c | 302 | out: |
a41f1a47 JM |
303 | /* -ENODATA isn't an error */ |
304 | if (err == -ENODATA) | |
305 | err = 0; | |
a72bdb1c JM |
306 | return err; |
307 | } | |
1da177e4 | 308 | |
a41f1a47 | 309 | static int delete_one_xattr(struct dentry *dentry, void *data) |
a72bdb1c | 310 | { |
a41f1a47 | 311 | struct inode *dir = dentry->d_parent->d_inode; |
1da177e4 | 312 | |
a41f1a47 JM |
313 | /* This is the xattr dir, handle specially. */ |
314 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
315 | return xattr_rmdir(dir, dentry); | |
1da177e4 | 316 | |
a41f1a47 JM |
317 | return xattr_unlink(dir, dentry); |
318 | } | |
bd4c625c | 319 | |
a41f1a47 JM |
320 | static int chown_one_xattr(struct dentry *dentry, void *data) |
321 | { | |
322 | struct iattr *attrs = data; | |
323 | return reiserfs_setattr(dentry, attrs); | |
324 | } | |
1da177e4 | 325 | |
a41f1a47 JM |
326 | /* No i_mutex, but the inode is unconnected. */ |
327 | int reiserfs_delete_xattrs(struct inode *inode) | |
328 | { | |
329 | int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); | |
330 | if (err) | |
331 | reiserfs_warning(inode->i_sb, "jdm-20004", | |
332 | "Couldn't delete all xattrs (%d)\n", err); | |
a72bdb1c JM |
333 | return err; |
334 | } | |
1da177e4 | 335 | |
a41f1a47 | 336 | /* inode->i_mutex: down */ |
a72bdb1c JM |
337 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
338 | { | |
a41f1a47 | 339 | int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); |
8b6dd72a JM |
340 | if (err) |
341 | reiserfs_warning(inode->i_sb, "jdm-20007", | |
342 | "Couldn't chown all xattrs (%d)\n", err); | |
a72bdb1c | 343 | return err; |
1da177e4 LT |
344 | } |
345 | ||
a72bdb1c | 346 | #ifdef CONFIG_REISERFS_FS_XATTR |
a72bdb1c JM |
347 | /* Returns a dentry corresponding to a specific extended attribute file |
348 | * for the inode. If flags allow, the file is created. Otherwise, a | |
349 | * valid or negative dentry, or an error is returned. */ | |
48b32a35 JM |
350 | static struct dentry *xattr_lookup(struct inode *inode, const char *name, |
351 | int flags) | |
1da177e4 | 352 | { |
a72bdb1c JM |
353 | struct dentry *xadir, *xafile; |
354 | int err = 0; | |
355 | ||
356 | xadir = open_xa_dir(inode, flags); | |
6c17675e | 357 | if (IS_ERR(xadir)) |
a72bdb1c | 358 | return ERR_CAST(xadir); |
a72bdb1c | 359 | |
5a6059c3 | 360 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
a72bdb1c JM |
361 | xafile = lookup_one_len(name, xadir, strlen(name)); |
362 | if (IS_ERR(xafile)) { | |
6c17675e JM |
363 | err = PTR_ERR(xafile); |
364 | goto out; | |
bd4c625c | 365 | } |
a72bdb1c | 366 | |
6c17675e JM |
367 | if (xafile->d_inode && (flags & XATTR_CREATE)) |
368 | err = -EEXIST; | |
a72bdb1c | 369 | |
6c17675e JM |
370 | if (!xafile->d_inode) { |
371 | err = -ENODATA; | |
5a6059c3 | 372 | if (xattr_may_create(flags)) |
6c17675e JM |
373 | err = xattr_create(xadir->d_inode, xafile, |
374 | 0700|S_IFREG); | |
a72bdb1c JM |
375 | } |
376 | ||
6c17675e JM |
377 | if (err) |
378 | dput(xafile); | |
a72bdb1c | 379 | out: |
5a6059c3 | 380 | mutex_unlock(&xadir->d_inode->i_mutex); |
a72bdb1c JM |
381 | dput(xadir); |
382 | if (err) | |
6c17675e | 383 | return ERR_PTR(err); |
a72bdb1c | 384 | return xafile; |
1da177e4 LT |
385 | } |
386 | ||
1da177e4 | 387 | /* Internal operations on file data */ |
bd4c625c | 388 | static inline void reiserfs_put_page(struct page *page) |
1da177e4 | 389 | { |
bd4c625c LT |
390 | kunmap(page); |
391 | page_cache_release(page); | |
1da177e4 LT |
392 | } |
393 | ||
ec6ea56b | 394 | static struct page *reiserfs_get_page(struct inode *dir, size_t n) |
1da177e4 | 395 | { |
bd4c625c LT |
396 | struct address_space *mapping = dir->i_mapping; |
397 | struct page *page; | |
398 | /* We can deadlock if we try to free dentries, | |
399 | and an unlink/rmdir has just occured - GFP_NOFS avoids this */ | |
c4cdd038 | 400 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
ec6ea56b | 401 | page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL); |
bd4c625c | 402 | if (!IS_ERR(page)) { |
bd4c625c | 403 | kmap(page); |
bd4c625c LT |
404 | if (PageError(page)) |
405 | goto fail; | |
406 | } | |
407 | return page; | |
408 | ||
409 | fail: | |
410 | reiserfs_put_page(page); | |
411 | return ERR_PTR(-EIO); | |
1da177e4 LT |
412 | } |
413 | ||
bd4c625c | 414 | static inline __u32 xattr_hash(const char *msg, int len) |
1da177e4 | 415 | { |
bd4c625c | 416 | return csum_partial(msg, len, 0); |
1da177e4 LT |
417 | } |
418 | ||
ba9d8cec VS |
419 | int reiserfs_commit_write(struct file *f, struct page *page, |
420 | unsigned from, unsigned to); | |
ba9d8cec | 421 | |
48b32a35 JM |
422 | static void update_ctime(struct inode *inode) |
423 | { | |
424 | struct timespec now = current_fs_time(inode->i_sb); | |
1d3382cb | 425 | if (inode_unhashed(inode) || !inode->i_nlink || |
48b32a35 JM |
426 | timespec_equal(&inode->i_ctime, &now)) |
427 | return; | |
428 | ||
429 | inode->i_ctime = CURRENT_TIME_SEC; | |
430 | mark_inode_dirty(inode); | |
431 | } | |
432 | ||
433 | static int lookup_and_delete_xattr(struct inode *inode, const char *name) | |
434 | { | |
435 | int err = 0; | |
436 | struct dentry *dentry, *xadir; | |
437 | ||
438 | xadir = open_xa_dir(inode, XATTR_REPLACE); | |
439 | if (IS_ERR(xadir)) | |
440 | return PTR_ERR(xadir); | |
441 | ||
5a6059c3 | 442 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
48b32a35 JM |
443 | dentry = lookup_one_len(name, xadir, strlen(name)); |
444 | if (IS_ERR(dentry)) { | |
445 | err = PTR_ERR(dentry); | |
446 | goto out_dput; | |
447 | } | |
448 | ||
449 | if (dentry->d_inode) { | |
4f3be1b5 | 450 | reiserfs_write_lock(inode->i_sb); |
48b32a35 | 451 | err = xattr_unlink(xadir->d_inode, dentry); |
4f3be1b5 | 452 | reiserfs_write_unlock(inode->i_sb); |
48b32a35 JM |
453 | update_ctime(inode); |
454 | } | |
455 | ||
456 | dput(dentry); | |
457 | out_dput: | |
5a6059c3 | 458 | mutex_unlock(&xadir->d_inode->i_mutex); |
48b32a35 JM |
459 | dput(xadir); |
460 | return err; | |
461 | } | |
462 | ||
ba9d8cec | 463 | |
1da177e4 LT |
464 | /* Generic extended attribute operations that can be used by xa plugins */ |
465 | ||
466 | /* | |
1b1dcc1b | 467 | * inode->i_mutex: down |
1da177e4 LT |
468 | */ |
469 | int | |
0ab2621e JM |
470 | reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, |
471 | struct inode *inode, const char *name, | |
472 | const void *buffer, size_t buffer_size, int flags) | |
1da177e4 | 473 | { |
bd4c625c | 474 | int err = 0; |
3227e14c | 475 | struct dentry *dentry; |
bd4c625c LT |
476 | struct page *page; |
477 | char *data; | |
bd4c625c LT |
478 | size_t file_pos = 0; |
479 | size_t buffer_pos = 0; | |
48b32a35 | 480 | size_t new_size; |
bd4c625c LT |
481 | __u32 xahash = 0; |
482 | ||
bd4c625c LT |
483 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
484 | return -EOPNOTSUPP; | |
485 | ||
3f14fea6 | 486 | reiserfs_write_unlock(inode->i_sb); |
4f3be1b5 FW |
487 | |
488 | if (!buffer) { | |
489 | err = lookup_and_delete_xattr(inode, name); | |
490 | reiserfs_write_lock(inode->i_sb); | |
491 | return err; | |
492 | } | |
493 | ||
48b32a35 | 494 | dentry = xattr_lookup(inode, name, flags); |
3f14fea6 FW |
495 | if (IS_ERR(dentry)) { |
496 | reiserfs_write_lock(inode->i_sb); | |
48b32a35 | 497 | return PTR_ERR(dentry); |
3f14fea6 FW |
498 | } |
499 | ||
f3e22f48 | 500 | down_write(&REISERFS_I(inode)->i_xattr_sem); |
bd4c625c | 501 | |
3f14fea6 | 502 | reiserfs_write_lock(inode->i_sb); |
bd4c625c | 503 | |
8b6dd72a | 504 | xahash = xattr_hash(buffer, buffer_size); |
bd4c625c LT |
505 | while (buffer_pos < buffer_size || buffer_pos == 0) { |
506 | size_t chunk; | |
507 | size_t skip = 0; | |
508 | size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1)); | |
509 | if (buffer_size - buffer_pos > PAGE_CACHE_SIZE) | |
510 | chunk = PAGE_CACHE_SIZE; | |
511 | else | |
512 | chunk = buffer_size - buffer_pos; | |
513 | ||
ec6ea56b | 514 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
515 | if (IS_ERR(page)) { |
516 | err = PTR_ERR(page); | |
48b32a35 | 517 | goto out_unlock; |
bd4c625c LT |
518 | } |
519 | ||
520 | lock_page(page); | |
521 | data = page_address(page); | |
522 | ||
523 | if (file_pos == 0) { | |
524 | struct reiserfs_xattr_header *rxh; | |
525 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
526 | if (chunk + skip > PAGE_CACHE_SIZE) | |
527 | chunk = PAGE_CACHE_SIZE - skip; | |
528 | rxh = (struct reiserfs_xattr_header *)data; | |
529 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); | |
530 | rxh->h_hash = cpu_to_le32(xahash); | |
531 | } | |
532 | ||
ebdec241 | 533 | err = __reiserfs_write_begin(page, page_offset, chunk + skip); |
bd4c625c LT |
534 | if (!err) { |
535 | if (buffer) | |
536 | memcpy(data + skip, buffer + buffer_pos, chunk); | |
3227e14c JM |
537 | err = reiserfs_commit_write(NULL, page, page_offset, |
538 | page_offset + chunk + | |
539 | skip); | |
bd4c625c LT |
540 | } |
541 | unlock_page(page); | |
542 | reiserfs_put_page(page); | |
543 | buffer_pos += chunk; | |
544 | file_pos += chunk; | |
545 | skip = 0; | |
546 | if (err || buffer_size == 0 || !buffer) | |
547 | break; | |
548 | } | |
549 | ||
48b32a35 JM |
550 | new_size = buffer_size + sizeof(struct reiserfs_xattr_header); |
551 | if (!err && new_size < i_size_read(dentry->d_inode)) { | |
552 | struct iattr newattrs = { | |
553 | .ia_ctime = current_fs_time(inode->i_sb), | |
fb2162df | 554 | .ia_size = new_size, |
48b32a35 JM |
555 | .ia_valid = ATTR_SIZE | ATTR_CTIME, |
556 | }; | |
31370f62 FW |
557 | |
558 | reiserfs_write_unlock(inode->i_sb); | |
48b32a35 JM |
559 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR); |
560 | down_write(&dentry->d_inode->i_alloc_sem); | |
31370f62 FW |
561 | reiserfs_write_lock(inode->i_sb); |
562 | ||
48b32a35 JM |
563 | err = reiserfs_setattr(dentry, &newattrs); |
564 | up_write(&dentry->d_inode->i_alloc_sem); | |
565 | mutex_unlock(&dentry->d_inode->i_mutex); | |
566 | } else | |
567 | update_ctime(inode); | |
568 | out_unlock: | |
8b6dd72a | 569 | up_write(&REISERFS_I(inode)->i_xattr_sem); |
3227e14c | 570 | dput(dentry); |
48b32a35 JM |
571 | return err; |
572 | } | |
bd4c625c | 573 | |
0ab2621e JM |
574 | /* We need to start a transaction to maintain lock ordering */ |
575 | int reiserfs_xattr_set(struct inode *inode, const char *name, | |
576 | const void *buffer, size_t buffer_size, int flags) | |
48b32a35 | 577 | { |
0ab2621e JM |
578 | |
579 | struct reiserfs_transaction_handle th; | |
580 | int error, error2; | |
581 | size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size); | |
582 | ||
583 | if (!(flags & XATTR_REPLACE)) | |
584 | jbegin_count += reiserfs_xattr_jcreate_nblocks(inode); | |
585 | ||
586 | reiserfs_write_lock(inode->i_sb); | |
587 | error = journal_begin(&th, inode->i_sb, jbegin_count); | |
588 | if (error) { | |
589 | reiserfs_write_unlock(inode->i_sb); | |
590 | return error; | |
1da177e4 | 591 | } |
bd4c625c | 592 | |
0ab2621e JM |
593 | error = reiserfs_xattr_set_handle(&th, inode, name, |
594 | buffer, buffer_size, flags); | |
bd4c625c | 595 | |
0ab2621e JM |
596 | error2 = journal_end(&th, inode->i_sb, jbegin_count); |
597 | if (error == 0) | |
598 | error = error2; | |
599 | reiserfs_write_unlock(inode->i_sb); | |
600 | ||
601 | return error; | |
1da177e4 LT |
602 | } |
603 | ||
604 | /* | |
1b1dcc1b | 605 | * inode->i_mutex: down |
1da177e4 LT |
606 | */ |
607 | int | |
48b32a35 | 608 | reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, |
bd4c625c | 609 | size_t buffer_size) |
1da177e4 | 610 | { |
bd4c625c | 611 | ssize_t err = 0; |
3227e14c | 612 | struct dentry *dentry; |
bd4c625c LT |
613 | size_t isize; |
614 | size_t file_pos = 0; | |
615 | size_t buffer_pos = 0; | |
616 | struct page *page; | |
bd4c625c LT |
617 | __u32 hash = 0; |
618 | ||
619 | if (name == NULL) | |
620 | return -EINVAL; | |
621 | ||
622 | /* We can't have xattrs attached to v1 items since they don't have | |
623 | * generation numbers */ | |
624 | if (get_inode_sd_version(inode) == STAT_DATA_V1) | |
625 | return -EOPNOTSUPP; | |
626 | ||
48b32a35 | 627 | dentry = xattr_lookup(inode, name, XATTR_REPLACE); |
3227e14c JM |
628 | if (IS_ERR(dentry)) { |
629 | err = PTR_ERR(dentry); | |
bd4c625c LT |
630 | goto out; |
631 | } | |
632 | ||
8b6dd72a | 633 | down_read(&REISERFS_I(inode)->i_xattr_sem); |
d984561b | 634 | |
f437c529 | 635 | isize = i_size_read(dentry->d_inode); |
bd4c625c LT |
636 | |
637 | /* Just return the size needed */ | |
638 | if (buffer == NULL) { | |
639 | err = isize - sizeof(struct reiserfs_xattr_header); | |
8b6dd72a | 640 | goto out_unlock; |
bd4c625c LT |
641 | } |
642 | ||
643 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { | |
644 | err = -ERANGE; | |
8b6dd72a | 645 | goto out_unlock; |
bd4c625c LT |
646 | } |
647 | ||
648 | while (file_pos < isize) { | |
649 | size_t chunk; | |
650 | char *data; | |
651 | size_t skip = 0; | |
652 | if (isize - file_pos > PAGE_CACHE_SIZE) | |
653 | chunk = PAGE_CACHE_SIZE; | |
654 | else | |
655 | chunk = isize - file_pos; | |
656 | ||
a72bdb1c | 657 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
658 | if (IS_ERR(page)) { |
659 | err = PTR_ERR(page); | |
8b6dd72a | 660 | goto out_unlock; |
bd4c625c LT |
661 | } |
662 | ||
663 | lock_page(page); | |
664 | data = page_address(page); | |
665 | if (file_pos == 0) { | |
666 | struct reiserfs_xattr_header *rxh = | |
667 | (struct reiserfs_xattr_header *)data; | |
668 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
669 | chunk -= skip; | |
670 | /* Magic doesn't match up.. */ | |
671 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { | |
672 | unlock_page(page); | |
673 | reiserfs_put_page(page); | |
a72bdb1c | 674 | reiserfs_warning(inode->i_sb, "jdm-20001", |
bd4c625c LT |
675 | "Invalid magic for xattr (%s) " |
676 | "associated with %k", name, | |
677 | INODE_PKEY(inode)); | |
678 | err = -EIO; | |
8b6dd72a | 679 | goto out_unlock; |
bd4c625c LT |
680 | } |
681 | hash = le32_to_cpu(rxh->h_hash); | |
682 | } | |
683 | memcpy(buffer + buffer_pos, data + skip, chunk); | |
684 | unlock_page(page); | |
685 | reiserfs_put_page(page); | |
686 | file_pos += chunk; | |
687 | buffer_pos += chunk; | |
688 | skip = 0; | |
689 | } | |
690 | err = isize - sizeof(struct reiserfs_xattr_header); | |
691 | ||
692 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != | |
693 | hash) { | |
a72bdb1c | 694 | reiserfs_warning(inode->i_sb, "jdm-20002", |
bd4c625c LT |
695 | "Invalid hash for xattr (%s) associated " |
696 | "with %k", name, INODE_PKEY(inode)); | |
697 | err = -EIO; | |
698 | } | |
699 | ||
8b6dd72a JM |
700 | out_unlock: |
701 | up_read(&REISERFS_I(inode)->i_xattr_sem); | |
3227e14c | 702 | dput(dentry); |
bd4c625c | 703 | |
a72bdb1c | 704 | out: |
bd4c625c | 705 | return err; |
1da177e4 LT |
706 | } |
707 | ||
48b32a35 JM |
708 | /* |
709 | * In order to implement different sets of xattr operations for each xattr | |
710 | * prefix with the generic xattr API, a filesystem should create a | |
711 | * null-terminated array of struct xattr_handler (one for each prefix) and | |
712 | * hang a pointer to it off of the s_xattr field of the superblock. | |
713 | * | |
714 | * The generic_fooxattr() functions will use this list to dispatch xattr | |
715 | * operations to the correct xattr_handler. | |
716 | */ | |
717 | #define for_each_xattr_handler(handlers, handler) \ | |
718 | for ((handler) = *(handlers)++; \ | |
719 | (handler) != NULL; \ | |
720 | (handler) = *(handlers)++) | |
1da177e4 | 721 | |
48b32a35 | 722 | /* This is the implementation for the xattr plugin infrastructure */ |
94d09a98 SH |
723 | static inline const struct xattr_handler * |
724 | find_xattr_handler_prefix(const struct xattr_handler **handlers, | |
48b32a35 | 725 | const char *name) |
1da177e4 | 726 | { |
94d09a98 | 727 | const struct xattr_handler *xah; |
bd4c625c | 728 | |
48b32a35 JM |
729 | if (!handlers) |
730 | return NULL; | |
bd4c625c | 731 | |
48b32a35 JM |
732 | for_each_xattr_handler(handlers, xah) { |
733 | if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0) | |
734 | break; | |
bd4c625c LT |
735 | } |
736 | ||
48b32a35 | 737 | return xah; |
bd4c625c | 738 | } |
1da177e4 | 739 | |
1da177e4 LT |
740 | |
741 | /* | |
742 | * Inode operation getxattr() | |
1da177e4 LT |
743 | */ |
744 | ssize_t | |
bd4c625c LT |
745 | reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, |
746 | size_t size) | |
1da177e4 | 747 | { |
94d09a98 | 748 | const struct xattr_handler *handler; |
bd4c625c | 749 | |
431547b3 | 750 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 751 | |
431547b3 | 752 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c LT |
753 | return -EOPNOTSUPP; |
754 | ||
431547b3 | 755 | return handler->get(dentry, name, buffer, size, handler->flags); |
1da177e4 LT |
756 | } |
757 | ||
1da177e4 LT |
758 | /* |
759 | * Inode operation setxattr() | |
760 | * | |
1b1dcc1b | 761 | * dentry->d_inode->i_mutex down |
1da177e4 LT |
762 | */ |
763 | int | |
bd4c625c LT |
764 | reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
765 | size_t size, int flags) | |
1da177e4 | 766 | { |
94d09a98 | 767 | const struct xattr_handler *handler; |
bd4c625c | 768 | |
431547b3 | 769 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 770 | |
431547b3 | 771 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c LT |
772 | return -EOPNOTSUPP; |
773 | ||
431547b3 | 774 | return handler->set(dentry, name, value, size, flags, handler->flags); |
1da177e4 LT |
775 | } |
776 | ||
777 | /* | |
778 | * Inode operation removexattr() | |
779 | * | |
1b1dcc1b | 780 | * dentry->d_inode->i_mutex down |
1da177e4 | 781 | */ |
bd4c625c | 782 | int reiserfs_removexattr(struct dentry *dentry, const char *name) |
1da177e4 | 783 | { |
94d09a98 | 784 | const struct xattr_handler *handler; |
431547b3 | 785 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
1da177e4 | 786 | |
431547b3 | 787 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c | 788 | return -EOPNOTSUPP; |
1da177e4 | 789 | |
431547b3 | 790 | return handler->set(dentry, name, NULL, 0, XATTR_REPLACE, handler->flags); |
1da177e4 LT |
791 | } |
792 | ||
48b32a35 JM |
793 | struct listxattr_buf { |
794 | size_t size; | |
795 | size_t pos; | |
796 | char *buf; | |
431547b3 | 797 | struct dentry *dentry; |
1da177e4 LT |
798 | }; |
799 | ||
48b32a35 JM |
800 | static int listxattr_filler(void *buf, const char *name, int namelen, |
801 | loff_t offset, u64 ino, unsigned int d_type) | |
1da177e4 | 802 | { |
48b32a35 JM |
803 | struct listxattr_buf *b = (struct listxattr_buf *)buf; |
804 | size_t size; | |
805 | if (name[0] != '.' || | |
806 | (namelen != 1 && (name[1] != '.' || namelen != 2))) { | |
94d09a98 | 807 | const struct xattr_handler *handler; |
431547b3 | 808 | handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr, |
48b32a35 JM |
809 | name); |
810 | if (!handler) /* Unsupported xattr name */ | |
811 | return 0; | |
812 | if (b->buf) { | |
431547b3 CH |
813 | size = handler->list(b->dentry, b->buf + b->pos, |
814 | b->size, name, namelen, | |
815 | handler->flags); | |
48b32a35 JM |
816 | if (size > b->size) |
817 | return -ERANGE; | |
818 | } else { | |
431547b3 CH |
819 | size = handler->list(b->dentry, NULL, 0, name, |
820 | namelen, handler->flags); | |
bd4c625c | 821 | } |
bd4c625c | 822 | |
48b32a35 JM |
823 | b->pos += size; |
824 | } | |
bd4c625c | 825 | return 0; |
1da177e4 | 826 | } |
bd4c625c | 827 | |
1da177e4 LT |
828 | /* |
829 | * Inode operation listxattr() | |
830 | * | |
48b32a35 JM |
831 | * We totally ignore the generic listxattr here because it would be stupid |
832 | * not to. Since the xattrs are organized in a directory, we can just | |
833 | * readdir to find them. | |
1da177e4 | 834 | */ |
bd4c625c | 835 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
1da177e4 | 836 | { |
bd4c625c LT |
837 | struct dentry *dir; |
838 | int err = 0; | |
a41f1a47 | 839 | loff_t pos = 0; |
48b32a35 | 840 | struct listxattr_buf buf = { |
431547b3 | 841 | .dentry = dentry, |
48b32a35 JM |
842 | .buf = buffer, |
843 | .size = buffer ? size : 0, | |
844 | }; | |
bd4c625c LT |
845 | |
846 | if (!dentry->d_inode) | |
847 | return -EINVAL; | |
848 | ||
677c9b2e | 849 | if (!dentry->d_sb->s_xattr || |
bd4c625c LT |
850 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
851 | return -EOPNOTSUPP; | |
852 | ||
6c17675e | 853 | dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE); |
bd4c625c LT |
854 | if (IS_ERR(dir)) { |
855 | err = PTR_ERR(dir); | |
856 | if (err == -ENODATA) | |
48b32a35 | 857 | err = 0; /* Not an error if there aren't any xattrs */ |
bd4c625c LT |
858 | goto out; |
859 | } | |
860 | ||
6c17675e | 861 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
a41f1a47 | 862 | err = reiserfs_readdir_dentry(dir, &buf, listxattr_filler, &pos); |
6c17675e | 863 | mutex_unlock(&dir->d_inode->i_mutex); |
bd4c625c | 864 | |
48b32a35 JM |
865 | if (!err) |
866 | err = buf.pos; | |
bd4c625c | 867 | |
3227e14c | 868 | dput(dir); |
8b6dd72a | 869 | out: |
bd4c625c | 870 | return err; |
1da177e4 LT |
871 | } |
872 | ||
b74c79e9 | 873 | static int reiserfs_check_acl(struct inode *inode, int mask, unsigned int flags) |
1da177e4 | 874 | { |
a72bdb1c JM |
875 | struct posix_acl *acl; |
876 | int error = -EAGAIN; /* do regular unix permission checks by default */ | |
bd4c625c | 877 | |
b74c79e9 NP |
878 | if (flags & IPERM_FLAG_RCU) |
879 | return -ECHILD; | |
880 | ||
a72bdb1c JM |
881 | acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS); |
882 | ||
a72bdb1c JM |
883 | if (acl) { |
884 | if (!IS_ERR(acl)) { | |
885 | error = posix_acl_permission(inode, acl, mask); | |
886 | posix_acl_release(acl); | |
887 | } else if (PTR_ERR(acl) != -ENODATA) | |
888 | error = PTR_ERR(acl); | |
bd4c625c LT |
889 | } |
890 | ||
a72bdb1c | 891 | return error; |
1da177e4 LT |
892 | } |
893 | ||
a72bdb1c | 894 | static int create_privroot(struct dentry *dentry) |
1da177e4 | 895 | { |
a72bdb1c JM |
896 | int err; |
897 | struct inode *inode = dentry->d_parent->d_inode; | |
5a6059c3 JM |
898 | WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex)); |
899 | ||
6c17675e | 900 | err = xattr_mkdir(inode, dentry, 0700); |
edcc37a0 AV |
901 | if (err || !dentry->d_inode) { |
902 | reiserfs_warning(dentry->d_sb, "jdm-20006", | |
903 | "xattrs/ACLs enabled and couldn't " | |
904 | "find/create .reiserfs_priv. " | |
905 | "Failing mount."); | |
906 | return -EOPNOTSUPP; | |
bd4c625c LT |
907 | } |
908 | ||
edcc37a0 AV |
909 | dentry->d_inode->i_flags |= S_PRIVATE; |
910 | reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr " | |
911 | "storage.\n", PRIVROOT_NAME); | |
bd4c625c | 912 | |
edcc37a0 | 913 | return 0; |
1da177e4 LT |
914 | } |
915 | ||
12abb35a JM |
916 | #else |
917 | int __init reiserfs_xattr_register_handlers(void) { return 0; } | |
918 | void reiserfs_xattr_unregister_handlers(void) {} | |
919 | static int create_privroot(struct dentry *dentry) { return 0; } | |
920 | #endif | |
921 | ||
922 | /* Actual operations that are exported to VFS-land */ | |
94d09a98 | 923 | const struct xattr_handler *reiserfs_xattr_handlers[] = { |
12abb35a JM |
924 | #ifdef CONFIG_REISERFS_FS_XATTR |
925 | &reiserfs_xattr_user_handler, | |
926 | &reiserfs_xattr_trusted_handler, | |
927 | #endif | |
928 | #ifdef CONFIG_REISERFS_FS_SECURITY | |
929 | &reiserfs_xattr_security_handler, | |
930 | #endif | |
931 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL | |
932 | &reiserfs_posix_acl_access_handler, | |
933 | &reiserfs_posix_acl_default_handler, | |
934 | #endif | |
935 | NULL | |
936 | }; | |
937 | ||
a72bdb1c | 938 | static int xattr_mount_check(struct super_block *s) |
1da177e4 | 939 | { |
a72bdb1c JM |
940 | /* We need generation numbers to ensure that the oid mapping is correct |
941 | * v3.5 filesystems don't have them. */ | |
48b32a35 JM |
942 | if (old_format_only(s)) { |
943 | if (reiserfs_xattrs_optional(s)) { | |
944 | /* Old format filesystem, but optional xattrs have | |
945 | * been enabled. Error out. */ | |
946 | reiserfs_warning(s, "jdm-2005", | |
947 | "xattrs/ACLs not supported " | |
948 | "on pre-v3.6 format filesystems. " | |
949 | "Failing mount."); | |
950 | return -EOPNOTSUPP; | |
951 | } | |
a72bdb1c JM |
952 | } |
953 | ||
954 | return 0; | |
1da177e4 LT |
955 | } |
956 | ||
b74c79e9 | 957 | int reiserfs_permission(struct inode *inode, int mask, unsigned int flags) |
b83674c0 | 958 | { |
b74c79e9 NP |
959 | if (flags & IPERM_FLAG_RCU) |
960 | return -ECHILD; | |
b83674c0 JM |
961 | /* |
962 | * We don't do permission checks on the internal objects. | |
963 | * Permissions are determined by the "owning" object. | |
964 | */ | |
965 | if (IS_PRIVATE(inode)) | |
966 | return 0; | |
967 | ||
968 | #ifdef CONFIG_REISERFS_FS_XATTR | |
969 | /* | |
970 | * Stat data v1 doesn't support ACLs. | |
971 | */ | |
972 | if (get_inode_sd_version(inode) != STAT_DATA_V1) | |
b74c79e9 NP |
973 | return generic_permission(inode, mask, flags, |
974 | reiserfs_check_acl); | |
b83674c0 | 975 | #endif |
b74c79e9 | 976 | return generic_permission(inode, mask, flags, NULL); |
b83674c0 JM |
977 | } |
978 | ||
cac36f70 | 979 | static int xattr_hide_revalidate(struct dentry *dentry, struct nameidata *nd) |
1da177e4 | 980 | { |
cac36f70 | 981 | return -EPERM; |
1da177e4 LT |
982 | } |
983 | ||
e16404ed | 984 | static const struct dentry_operations xattr_lookup_poison_ops = { |
cac36f70 | 985 | .d_revalidate = xattr_hide_revalidate, |
1da177e4 LT |
986 | }; |
987 | ||
edcc37a0 AV |
988 | int reiserfs_lookup_privroot(struct super_block *s) |
989 | { | |
990 | struct dentry *dentry; | |
991 | int err = 0; | |
992 | ||
993 | /* If we don't have the privroot located yet - go find it */ | |
c72e0575 | 994 | reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s); |
edcc37a0 AV |
995 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, |
996 | strlen(PRIVROOT_NAME)); | |
997 | if (!IS_ERR(dentry)) { | |
998 | REISERFS_SB(s)->priv_root = dentry; | |
fb045adb | 999 | d_set_d_op(dentry, &xattr_lookup_poison_ops); |
edcc37a0 AV |
1000 | if (dentry->d_inode) |
1001 | dentry->d_inode->i_flags |= S_PRIVATE; | |
1002 | } else | |
1003 | err = PTR_ERR(dentry); | |
1004 | mutex_unlock(&s->s_root->d_inode->i_mutex); | |
1005 | ||
1006 | return err; | |
1007 | } | |
1008 | ||
1da177e4 LT |
1009 | /* We need to take a copy of the mount flags since things like |
1010 | * MS_RDONLY don't get set until *after* we're called. | |
1011 | * mount_flags != mount_options */ | |
bd4c625c | 1012 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
1da177e4 | 1013 | { |
bd4c625c | 1014 | int err = 0; |
ab17c4f0 | 1015 | struct dentry *privroot = REISERFS_SB(s)->priv_root; |
bd4c625c | 1016 | |
a72bdb1c JM |
1017 | err = xattr_mount_check(s); |
1018 | if (err) | |
bd4c625c | 1019 | goto error; |
bd4c625c | 1020 | |
ab17c4f0 | 1021 | if (!privroot->d_inode && !(mount_flags & MS_RDONLY)) { |
ae635c0b | 1022 | reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s); |
edcc37a0 | 1023 | err = create_privroot(REISERFS_SB(s)->priv_root); |
5a6059c3 | 1024 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
bd4c625c | 1025 | } |
ab17c4f0 JM |
1026 | |
1027 | if (privroot->d_inode) { | |
48b32a35 | 1028 | s->s_xattr = reiserfs_xattr_handlers; |
c72e0575 | 1029 | reiserfs_mutex_lock_safe(&privroot->d_inode->i_mutex, s); |
ab17c4f0 JM |
1030 | if (!REISERFS_SB(s)->xattr_root) { |
1031 | struct dentry *dentry; | |
1032 | dentry = lookup_one_len(XAROOT_NAME, privroot, | |
1033 | strlen(XAROOT_NAME)); | |
1034 | if (!IS_ERR(dentry)) | |
1035 | REISERFS_SB(s)->xattr_root = dentry; | |
1036 | else | |
1037 | err = PTR_ERR(dentry); | |
1038 | } | |
1039 | mutex_unlock(&privroot->d_inode->i_mutex); | |
1040 | } | |
48b32a35 | 1041 | |
a72bdb1c | 1042 | error: |
bd4c625c | 1043 | if (err) { |
bd4c625c LT |
1044 | clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt)); |
1045 | clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt)); | |
1046 | } | |
1047 | ||
1048 | /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */ | |
bd4c625c LT |
1049 | if (reiserfs_posixacl(s)) |
1050 | s->s_flags |= MS_POSIXACL; | |
ab17c4f0 | 1051 | else |
ab17c4f0 | 1052 | s->s_flags &= ~MS_POSIXACL; |
bd4c625c LT |
1053 | |
1054 | return err; | |
1da177e4 | 1055 | } |