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Commit | Line | Data |
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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> | |
41 | #include <linux/fs.h> | |
42 | #include <linux/file.h> | |
43 | #include <linux/pagemap.h> | |
44 | #include <linux/xattr.h> | |
45 | #include <linux/reiserfs_xattr.h> | |
46 | #include <linux/reiserfs_acl.h> | |
1da177e4 | 47 | #include <asm/uaccess.h> |
3277c39f | 48 | #include <net/checksum.h> |
1da177e4 | 49 | #include <linux/stat.h> |
6c17675e | 50 | #include <linux/quotaops.h> |
431547b3 | 51 | #include <linux/security.h> |
1da177e4 | 52 | |
1da177e4 LT |
53 | #define PRIVROOT_NAME ".reiserfs_priv" |
54 | #define XAROOT_NAME "xattrs" | |
55 | ||
1da177e4 | 56 | |
6c17675e JM |
57 | /* Helpers for inode ops. We do this so that we don't have all the VFS |
58 | * overhead and also for proper i_mutex annotation. | |
59 | * dir->i_mutex must be held for all of them. */ | |
3a355cc6 | 60 | #ifdef CONFIG_REISERFS_FS_XATTR |
6c17675e | 61 | static int xattr_create(struct inode *dir, struct dentry *dentry, int mode) |
1da177e4 | 62 | { |
6c17675e | 63 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
e1c50248 | 64 | vfs_dq_init(dir); |
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)); | |
e1c50248 | 72 | vfs_dq_init(dir); |
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)); | |
e1c50248 | 84 | vfs_dq_init(dir); |
bd4c625c | 85 | |
4dd85969 FW |
86 | reiserfs_mutex_lock_nested_safe(&dentry->d_inode->i_mutex, |
87 | I_MUTEX_CHILD, dir->i_sb); | |
6c17675e JM |
88 | error = dir->i_op->unlink(dir, dentry); |
89 | mutex_unlock(&dentry->d_inode->i_mutex); | |
90 | ||
91 | if (!error) | |
92 | d_delete(dentry); | |
93 | return error; | |
94 | } | |
95 | ||
96 | static int xattr_rmdir(struct inode *dir, struct dentry *dentry) | |
97 | { | |
98 | int error; | |
99 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); | |
e1c50248 | 100 | vfs_dq_init(dir); |
6c17675e | 101 | |
835d5247 FW |
102 | reiserfs_mutex_lock_nested_safe(&dentry->d_inode->i_mutex, |
103 | I_MUTEX_CHILD, dir->i_sb); | |
6c17675e JM |
104 | dentry_unhash(dentry); |
105 | error = dir->i_op->rmdir(dir, dentry); | |
106 | if (!error) | |
107 | dentry->d_inode->i_flags |= S_DEAD; | |
108 | mutex_unlock(&dentry->d_inode->i_mutex); | |
109 | if (!error) | |
110 | d_delete(dentry); | |
111 | dput(dentry); | |
112 | ||
113 | return error; | |
114 | } | |
115 | ||
6c17675e JM |
116 | #define xattr_may_create(flags) (!flags || flags & XATTR_CREATE) |
117 | ||
ab17c4f0 | 118 | static struct dentry *open_xa_root(struct super_block *sb, int flags) |
6c17675e | 119 | { |
ab17c4f0 JM |
120 | struct dentry *privroot = REISERFS_SB(sb)->priv_root; |
121 | struct dentry *xaroot; | |
122 | if (!privroot->d_inode) | |
123 | return ERR_PTR(-ENODATA); | |
6c17675e | 124 | |
ab17c4f0 | 125 | mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR); |
6c17675e | 126 | |
ab17c4f0 | 127 | xaroot = dget(REISERFS_SB(sb)->xattr_root); |
ceb5edc4 JM |
128 | if (!xaroot) |
129 | xaroot = ERR_PTR(-ENODATA); | |
130 | else if (!xaroot->d_inode) { | |
ab17c4f0 | 131 | int err = -ENODATA; |
5a6059c3 | 132 | if (xattr_may_create(flags)) |
ab17c4f0 | 133 | err = xattr_mkdir(privroot->d_inode, xaroot, 0700); |
9b7f3755 | 134 | if (err) { |
ab17c4f0 JM |
135 | dput(xaroot); |
136 | xaroot = ERR_PTR(err); | |
9b7f3755 | 137 | } |
bd4c625c | 138 | } |
6c17675e | 139 | |
ab17c4f0 JM |
140 | mutex_unlock(&privroot->d_inode->i_mutex); |
141 | return xaroot; | |
1da177e4 LT |
142 | } |
143 | ||
bd4c625c | 144 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
1da177e4 | 145 | { |
bd4c625c LT |
146 | struct dentry *xaroot, *xadir; |
147 | char namebuf[17]; | |
148 | ||
6c17675e | 149 | xaroot = open_xa_root(inode->i_sb, flags); |
9b7f3755 | 150 | if (IS_ERR(xaroot)) |
bd4c625c | 151 | return xaroot; |
bd4c625c | 152 | |
bd4c625c LT |
153 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
154 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), | |
155 | inode->i_generation); | |
bd4c625c | 156 | |
ab17c4f0 JM |
157 | mutex_lock_nested(&xaroot->d_inode->i_mutex, I_MUTEX_XATTR); |
158 | ||
159 | xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf)); | |
160 | if (!IS_ERR(xadir) && !xadir->d_inode) { | |
161 | int err = -ENODATA; | |
162 | if (xattr_may_create(flags)) | |
163 | err = xattr_mkdir(xaroot->d_inode, xadir, 0700); | |
164 | if (err) { | |
165 | dput(xadir); | |
166 | xadir = ERR_PTR(err); | |
167 | } | |
168 | } | |
169 | ||
170 | mutex_unlock(&xaroot->d_inode->i_mutex); | |
bd4c625c LT |
171 | dput(xaroot); |
172 | return xadir; | |
1da177e4 LT |
173 | } |
174 | ||
48b32a35 JM |
175 | /* The following are side effects of other operations that aren't explicitly |
176 | * modifying extended attributes. This includes operations such as permissions | |
177 | * or ownership changes, object deletions, etc. */ | |
a41f1a47 JM |
178 | struct reiserfs_dentry_buf { |
179 | struct dentry *xadir; | |
180 | int count; | |
181 | struct dentry *dentries[8]; | |
182 | }; | |
bd4c625c | 183 | |
a72bdb1c | 184 | static int |
a41f1a47 JM |
185 | fill_with_dentries(void *buf, const char *name, int namelen, loff_t offset, |
186 | u64 ino, unsigned int d_type) | |
a72bdb1c | 187 | { |
a41f1a47 | 188 | struct reiserfs_dentry_buf *dbuf = buf; |
a72bdb1c | 189 | struct dentry *dentry; |
5a6059c3 | 190 | WARN_ON_ONCE(!mutex_is_locked(&dbuf->xadir->d_inode->i_mutex)); |
bd4c625c | 191 | |
a41f1a47 JM |
192 | if (dbuf->count == ARRAY_SIZE(dbuf->dentries)) |
193 | return -ENOSPC; | |
bd4c625c | 194 | |
a41f1a47 JM |
195 | if (name[0] == '.' && (name[1] == '\0' || |
196 | (name[1] == '.' && name[2] == '\0'))) | |
197 | return 0; | |
bd4c625c | 198 | |
a41f1a47 | 199 | dentry = lookup_one_len(name, dbuf->xadir, namelen); |
a72bdb1c | 200 | if (IS_ERR(dentry)) { |
a41f1a47 | 201 | return PTR_ERR(dentry); |
a72bdb1c | 202 | } else if (!dentry->d_inode) { |
a41f1a47 JM |
203 | /* A directory entry exists, but no file? */ |
204 | reiserfs_error(dentry->d_sb, "xattr-20003", | |
205 | "Corrupted directory: xattr %s listed but " | |
206 | "not found for file %s.\n", | |
207 | dentry->d_name.name, dbuf->xadir->d_name.name); | |
208 | dput(dentry); | |
209 | return -EIO; | |
bd4c625c | 210 | } |
1da177e4 | 211 | |
a41f1a47 JM |
212 | dbuf->dentries[dbuf->count++] = dentry; |
213 | return 0; | |
1da177e4 LT |
214 | } |
215 | ||
a41f1a47 JM |
216 | static void |
217 | cleanup_dentry_buf(struct reiserfs_dentry_buf *buf) | |
1da177e4 | 218 | { |
a41f1a47 JM |
219 | int i; |
220 | for (i = 0; i < buf->count; i++) | |
221 | if (buf->dentries[i]) | |
222 | dput(buf->dentries[i]); | |
a72bdb1c JM |
223 | } |
224 | ||
a41f1a47 JM |
225 | static int reiserfs_for_each_xattr(struct inode *inode, |
226 | int (*action)(struct dentry *, void *), | |
227 | void *data) | |
a72bdb1c | 228 | { |
a41f1a47 JM |
229 | struct dentry *dir; |
230 | int i, err = 0; | |
231 | loff_t pos = 0; | |
232 | struct reiserfs_dentry_buf buf = { | |
233 | .count = 0, | |
234 | }; | |
1da177e4 | 235 | |
a72bdb1c JM |
236 | /* Skip out, an xattr has no xattrs associated with it */ |
237 | if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1) | |
238 | return 0; | |
1da177e4 | 239 | |
27026a05 | 240 | reiserfs_write_unlock(inode->i_sb); |
6c17675e | 241 | dir = open_xa_dir(inode, XATTR_REPLACE); |
a72bdb1c JM |
242 | if (IS_ERR(dir)) { |
243 | err = PTR_ERR(dir); | |
27026a05 | 244 | reiserfs_write_lock(inode->i_sb); |
a72bdb1c JM |
245 | goto out; |
246 | } else if (!dir->d_inode) { | |
a41f1a47 | 247 | err = 0; |
27026a05 | 248 | reiserfs_write_lock(inode->i_sb); |
a41f1a47 | 249 | goto out_dir; |
a72bdb1c | 250 | } |
1da177e4 | 251 | |
6c17675e | 252 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
27026a05 FW |
253 | |
254 | reiserfs_write_lock(inode->i_sb); | |
255 | ||
a41f1a47 JM |
256 | buf.xadir = dir; |
257 | err = reiserfs_readdir_dentry(dir, &buf, fill_with_dentries, &pos); | |
258 | while ((err == 0 || err == -ENOSPC) && buf.count) { | |
259 | err = 0; | |
1da177e4 | 260 | |
a41f1a47 JM |
261 | for (i = 0; i < buf.count && buf.dentries[i]; i++) { |
262 | int lerr = 0; | |
263 | struct dentry *dentry = buf.dentries[i]; | |
1da177e4 | 264 | |
a41f1a47 JM |
265 | if (err == 0 && !S_ISDIR(dentry->d_inode->i_mode)) |
266 | lerr = action(dentry, data); | |
1da177e4 | 267 | |
a41f1a47 JM |
268 | dput(dentry); |
269 | buf.dentries[i] = NULL; | |
270 | err = lerr ?: err; | |
bd4c625c | 271 | } |
a41f1a47 JM |
272 | buf.count = 0; |
273 | if (!err) | |
274 | err = reiserfs_readdir_dentry(dir, &buf, | |
275 | fill_with_dentries, &pos); | |
8b6dd72a | 276 | } |
a41f1a47 | 277 | mutex_unlock(&dir->d_inode->i_mutex); |
1da177e4 | 278 | |
a41f1a47 JM |
279 | /* Clean up after a failed readdir */ |
280 | cleanup_dentry_buf(&buf); | |
1da177e4 | 281 | |
d984561b | 282 | if (!err) { |
a41f1a47 JM |
283 | /* We start a transaction here to avoid a ABBA situation |
284 | * between the xattr root's i_mutex and the journal lock. | |
285 | * This doesn't incur much additional overhead since the | |
286 | * new transaction will just nest inside the | |
287 | * outer transaction. */ | |
288 | int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + | |
289 | 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); | |
290 | struct reiserfs_transaction_handle th; | |
291 | err = journal_begin(&th, inode->i_sb, blocks); | |
292 | if (!err) { | |
293 | int jerror; | |
8b513f56 FW |
294 | reiserfs_mutex_lock_nested_safe( |
295 | &dir->d_parent->d_inode->i_mutex, | |
296 | I_MUTEX_XATTR, inode->i_sb); | |
a41f1a47 JM |
297 | err = action(dir, data); |
298 | jerror = journal_end(&th, inode->i_sb, blocks); | |
299 | mutex_unlock(&dir->d_parent->d_inode->i_mutex); | |
300 | err = jerror ?: err; | |
301 | } | |
a72bdb1c | 302 | } |
a41f1a47 JM |
303 | out_dir: |
304 | dput(dir); | |
a72bdb1c | 305 | out: |
a41f1a47 JM |
306 | /* -ENODATA isn't an error */ |
307 | if (err == -ENODATA) | |
308 | err = 0; | |
a72bdb1c JM |
309 | return err; |
310 | } | |
1da177e4 | 311 | |
a41f1a47 | 312 | static int delete_one_xattr(struct dentry *dentry, void *data) |
a72bdb1c | 313 | { |
a41f1a47 | 314 | struct inode *dir = dentry->d_parent->d_inode; |
1da177e4 | 315 | |
a41f1a47 JM |
316 | /* This is the xattr dir, handle specially. */ |
317 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
318 | return xattr_rmdir(dir, dentry); | |
1da177e4 | 319 | |
a41f1a47 JM |
320 | return xattr_unlink(dir, dentry); |
321 | } | |
bd4c625c | 322 | |
a41f1a47 JM |
323 | static int chown_one_xattr(struct dentry *dentry, void *data) |
324 | { | |
325 | struct iattr *attrs = data; | |
326 | return reiserfs_setattr(dentry, attrs); | |
327 | } | |
1da177e4 | 328 | |
a41f1a47 JM |
329 | /* No i_mutex, but the inode is unconnected. */ |
330 | int reiserfs_delete_xattrs(struct inode *inode) | |
331 | { | |
332 | int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); | |
333 | if (err) | |
334 | reiserfs_warning(inode->i_sb, "jdm-20004", | |
335 | "Couldn't delete all xattrs (%d)\n", err); | |
a72bdb1c JM |
336 | return err; |
337 | } | |
1da177e4 | 338 | |
a41f1a47 | 339 | /* inode->i_mutex: down */ |
a72bdb1c JM |
340 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
341 | { | |
a41f1a47 | 342 | int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); |
8b6dd72a JM |
343 | if (err) |
344 | reiserfs_warning(inode->i_sb, "jdm-20007", | |
345 | "Couldn't chown all xattrs (%d)\n", err); | |
a72bdb1c | 346 | return err; |
1da177e4 LT |
347 | } |
348 | ||
a72bdb1c | 349 | #ifdef CONFIG_REISERFS_FS_XATTR |
a72bdb1c JM |
350 | /* Returns a dentry corresponding to a specific extended attribute file |
351 | * for the inode. If flags allow, the file is created. Otherwise, a | |
352 | * valid or negative dentry, or an error is returned. */ | |
48b32a35 JM |
353 | static struct dentry *xattr_lookup(struct inode *inode, const char *name, |
354 | int flags) | |
1da177e4 | 355 | { |
a72bdb1c JM |
356 | struct dentry *xadir, *xafile; |
357 | int err = 0; | |
358 | ||
359 | xadir = open_xa_dir(inode, flags); | |
6c17675e | 360 | if (IS_ERR(xadir)) |
a72bdb1c | 361 | return ERR_CAST(xadir); |
a72bdb1c | 362 | |
5a6059c3 | 363 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
a72bdb1c JM |
364 | xafile = lookup_one_len(name, xadir, strlen(name)); |
365 | if (IS_ERR(xafile)) { | |
6c17675e JM |
366 | err = PTR_ERR(xafile); |
367 | goto out; | |
bd4c625c | 368 | } |
a72bdb1c | 369 | |
6c17675e JM |
370 | if (xafile->d_inode && (flags & XATTR_CREATE)) |
371 | err = -EEXIST; | |
a72bdb1c | 372 | |
6c17675e JM |
373 | if (!xafile->d_inode) { |
374 | err = -ENODATA; | |
5a6059c3 | 375 | if (xattr_may_create(flags)) |
6c17675e JM |
376 | err = xattr_create(xadir->d_inode, xafile, |
377 | 0700|S_IFREG); | |
a72bdb1c JM |
378 | } |
379 | ||
6c17675e JM |
380 | if (err) |
381 | dput(xafile); | |
a72bdb1c | 382 | out: |
5a6059c3 | 383 | mutex_unlock(&xadir->d_inode->i_mutex); |
a72bdb1c JM |
384 | dput(xadir); |
385 | if (err) | |
6c17675e | 386 | return ERR_PTR(err); |
a72bdb1c | 387 | return xafile; |
1da177e4 LT |
388 | } |
389 | ||
1da177e4 | 390 | /* Internal operations on file data */ |
bd4c625c | 391 | static inline void reiserfs_put_page(struct page *page) |
1da177e4 | 392 | { |
bd4c625c LT |
393 | kunmap(page); |
394 | page_cache_release(page); | |
1da177e4 LT |
395 | } |
396 | ||
ec6ea56b | 397 | static struct page *reiserfs_get_page(struct inode *dir, size_t n) |
1da177e4 | 398 | { |
bd4c625c LT |
399 | struct address_space *mapping = dir->i_mapping; |
400 | struct page *page; | |
401 | /* We can deadlock if we try to free dentries, | |
402 | and an unlink/rmdir has just occured - GFP_NOFS avoids this */ | |
c4cdd038 | 403 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
ec6ea56b | 404 | page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL); |
bd4c625c | 405 | if (!IS_ERR(page)) { |
bd4c625c | 406 | kmap(page); |
bd4c625c LT |
407 | if (PageError(page)) |
408 | goto fail; | |
409 | } | |
410 | return page; | |
411 | ||
412 | fail: | |
413 | reiserfs_put_page(page); | |
414 | return ERR_PTR(-EIO); | |
1da177e4 LT |
415 | } |
416 | ||
bd4c625c | 417 | static inline __u32 xattr_hash(const char *msg, int len) |
1da177e4 | 418 | { |
bd4c625c | 419 | return csum_partial(msg, len, 0); |
1da177e4 LT |
420 | } |
421 | ||
ba9d8cec VS |
422 | int reiserfs_commit_write(struct file *f, struct page *page, |
423 | unsigned from, unsigned to); | |
424 | int reiserfs_prepare_write(struct file *f, struct page *page, | |
425 | unsigned from, unsigned to); | |
426 | ||
48b32a35 JM |
427 | static void update_ctime(struct inode *inode) |
428 | { | |
429 | struct timespec now = current_fs_time(inode->i_sb); | |
430 | if (hlist_unhashed(&inode->i_hash) || !inode->i_nlink || | |
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) { | |
4f3be1b5 | 455 | reiserfs_write_lock(inode->i_sb); |
48b32a35 | 456 | err = xattr_unlink(xadir->d_inode, dentry); |
4f3be1b5 | 457 | reiserfs_write_unlock(inode->i_sb); |
48b32a35 JM |
458 | update_ctime(inode); |
459 | } | |
460 | ||
461 | dput(dentry); | |
462 | out_dput: | |
5a6059c3 | 463 | mutex_unlock(&xadir->d_inode->i_mutex); |
48b32a35 JM |
464 | dput(xadir); |
465 | return err; | |
466 | } | |
467 | ||
ba9d8cec | 468 | |
1da177e4 LT |
469 | /* Generic extended attribute operations that can be used by xa plugins */ |
470 | ||
471 | /* | |
1b1dcc1b | 472 | * inode->i_mutex: down |
1da177e4 LT |
473 | */ |
474 | int | |
0ab2621e JM |
475 | reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, |
476 | struct inode *inode, const char *name, | |
477 | const void *buffer, size_t buffer_size, int flags) | |
1da177e4 | 478 | { |
bd4c625c | 479 | int err = 0; |
3227e14c | 480 | struct dentry *dentry; |
bd4c625c LT |
481 | struct page *page; |
482 | char *data; | |
bd4c625c LT |
483 | size_t file_pos = 0; |
484 | size_t buffer_pos = 0; | |
48b32a35 | 485 | size_t new_size; |
bd4c625c LT |
486 | __u32 xahash = 0; |
487 | ||
bd4c625c LT |
488 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
489 | return -EOPNOTSUPP; | |
490 | ||
3f14fea6 | 491 | reiserfs_write_unlock(inode->i_sb); |
4f3be1b5 FW |
492 | |
493 | if (!buffer) { | |
494 | err = lookup_and_delete_xattr(inode, name); | |
495 | reiserfs_write_lock(inode->i_sb); | |
496 | return err; | |
497 | } | |
498 | ||
48b32a35 | 499 | dentry = xattr_lookup(inode, name, flags); |
3f14fea6 FW |
500 | if (IS_ERR(dentry)) { |
501 | reiserfs_write_lock(inode->i_sb); | |
48b32a35 | 502 | return PTR_ERR(dentry); |
3f14fea6 FW |
503 | } |
504 | ||
f3e22f48 | 505 | down_write(&REISERFS_I(inode)->i_xattr_sem); |
bd4c625c | 506 | |
3f14fea6 | 507 | reiserfs_write_lock(inode->i_sb); |
bd4c625c | 508 | |
8b6dd72a | 509 | xahash = xattr_hash(buffer, buffer_size); |
bd4c625c LT |
510 | while (buffer_pos < buffer_size || buffer_pos == 0) { |
511 | size_t chunk; | |
512 | size_t skip = 0; | |
513 | size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1)); | |
514 | if (buffer_size - buffer_pos > PAGE_CACHE_SIZE) | |
515 | chunk = PAGE_CACHE_SIZE; | |
516 | else | |
517 | chunk = buffer_size - buffer_pos; | |
518 | ||
ec6ea56b | 519 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
520 | if (IS_ERR(page)) { |
521 | err = PTR_ERR(page); | |
48b32a35 | 522 | goto out_unlock; |
bd4c625c LT |
523 | } |
524 | ||
525 | lock_page(page); | |
526 | data = page_address(page); | |
527 | ||
528 | if (file_pos == 0) { | |
529 | struct reiserfs_xattr_header *rxh; | |
530 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
531 | if (chunk + skip > PAGE_CACHE_SIZE) | |
532 | chunk = PAGE_CACHE_SIZE - skip; | |
533 | rxh = (struct reiserfs_xattr_header *)data; | |
534 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); | |
535 | rxh->h_hash = cpu_to_le32(xahash); | |
536 | } | |
537 | ||
3227e14c | 538 | err = reiserfs_prepare_write(NULL, page, page_offset, |
ba9d8cec | 539 | page_offset + chunk + skip); |
bd4c625c LT |
540 | if (!err) { |
541 | if (buffer) | |
542 | memcpy(data + skip, buffer + buffer_pos, chunk); | |
3227e14c JM |
543 | err = reiserfs_commit_write(NULL, page, page_offset, |
544 | page_offset + chunk + | |
545 | skip); | |
bd4c625c LT |
546 | } |
547 | unlock_page(page); | |
548 | reiserfs_put_page(page); | |
549 | buffer_pos += chunk; | |
550 | file_pos += chunk; | |
551 | skip = 0; | |
552 | if (err || buffer_size == 0 || !buffer) | |
553 | break; | |
554 | } | |
555 | ||
48b32a35 JM |
556 | new_size = buffer_size + sizeof(struct reiserfs_xattr_header); |
557 | if (!err && new_size < i_size_read(dentry->d_inode)) { | |
558 | struct iattr newattrs = { | |
559 | .ia_ctime = current_fs_time(inode->i_sb), | |
560 | .ia_size = buffer_size, | |
561 | .ia_valid = ATTR_SIZE | ATTR_CTIME, | |
562 | }; | |
31370f62 FW |
563 | |
564 | reiserfs_write_unlock(inode->i_sb); | |
48b32a35 JM |
565 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR); |
566 | down_write(&dentry->d_inode->i_alloc_sem); | |
31370f62 FW |
567 | reiserfs_write_lock(inode->i_sb); |
568 | ||
48b32a35 JM |
569 | err = reiserfs_setattr(dentry, &newattrs); |
570 | up_write(&dentry->d_inode->i_alloc_sem); | |
571 | mutex_unlock(&dentry->d_inode->i_mutex); | |
572 | } else | |
573 | update_ctime(inode); | |
574 | out_unlock: | |
8b6dd72a | 575 | up_write(&REISERFS_I(inode)->i_xattr_sem); |
3227e14c | 576 | dput(dentry); |
48b32a35 JM |
577 | return err; |
578 | } | |
bd4c625c | 579 | |
0ab2621e JM |
580 | /* We need to start a transaction to maintain lock ordering */ |
581 | int reiserfs_xattr_set(struct inode *inode, const char *name, | |
582 | const void *buffer, size_t buffer_size, int flags) | |
48b32a35 | 583 | { |
0ab2621e JM |
584 | |
585 | struct reiserfs_transaction_handle th; | |
586 | int error, error2; | |
587 | size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size); | |
588 | ||
589 | if (!(flags & XATTR_REPLACE)) | |
590 | jbegin_count += reiserfs_xattr_jcreate_nblocks(inode); | |
591 | ||
592 | reiserfs_write_lock(inode->i_sb); | |
593 | error = journal_begin(&th, inode->i_sb, jbegin_count); | |
594 | if (error) { | |
595 | reiserfs_write_unlock(inode->i_sb); | |
596 | return error; | |
1da177e4 | 597 | } |
bd4c625c | 598 | |
0ab2621e JM |
599 | error = reiserfs_xattr_set_handle(&th, inode, name, |
600 | buffer, buffer_size, flags); | |
bd4c625c | 601 | |
0ab2621e JM |
602 | error2 = journal_end(&th, inode->i_sb, jbegin_count); |
603 | if (error == 0) | |
604 | error = error2; | |
605 | reiserfs_write_unlock(inode->i_sb); | |
606 | ||
607 | return error; | |
1da177e4 LT |
608 | } |
609 | ||
610 | /* | |
1b1dcc1b | 611 | * inode->i_mutex: down |
1da177e4 LT |
612 | */ |
613 | int | |
48b32a35 | 614 | reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, |
bd4c625c | 615 | size_t buffer_size) |
1da177e4 | 616 | { |
bd4c625c | 617 | ssize_t err = 0; |
3227e14c | 618 | struct dentry *dentry; |
bd4c625c LT |
619 | size_t isize; |
620 | size_t file_pos = 0; | |
621 | size_t buffer_pos = 0; | |
622 | struct page *page; | |
bd4c625c LT |
623 | __u32 hash = 0; |
624 | ||
625 | if (name == NULL) | |
626 | return -EINVAL; | |
627 | ||
628 | /* We can't have xattrs attached to v1 items since they don't have | |
629 | * generation numbers */ | |
630 | if (get_inode_sd_version(inode) == STAT_DATA_V1) | |
631 | return -EOPNOTSUPP; | |
632 | ||
48b32a35 | 633 | dentry = xattr_lookup(inode, name, XATTR_REPLACE); |
3227e14c JM |
634 | if (IS_ERR(dentry)) { |
635 | err = PTR_ERR(dentry); | |
bd4c625c LT |
636 | goto out; |
637 | } | |
638 | ||
8b6dd72a | 639 | down_read(&REISERFS_I(inode)->i_xattr_sem); |
d984561b | 640 | |
f437c529 | 641 | isize = i_size_read(dentry->d_inode); |
bd4c625c LT |
642 | |
643 | /* Just return the size needed */ | |
644 | if (buffer == NULL) { | |
645 | err = isize - sizeof(struct reiserfs_xattr_header); | |
8b6dd72a | 646 | goto out_unlock; |
bd4c625c LT |
647 | } |
648 | ||
649 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { | |
650 | err = -ERANGE; | |
8b6dd72a | 651 | goto out_unlock; |
bd4c625c LT |
652 | } |
653 | ||
654 | while (file_pos < isize) { | |
655 | size_t chunk; | |
656 | char *data; | |
657 | size_t skip = 0; | |
658 | if (isize - file_pos > PAGE_CACHE_SIZE) | |
659 | chunk = PAGE_CACHE_SIZE; | |
660 | else | |
661 | chunk = isize - file_pos; | |
662 | ||
a72bdb1c | 663 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
664 | if (IS_ERR(page)) { |
665 | err = PTR_ERR(page); | |
8b6dd72a | 666 | goto out_unlock; |
bd4c625c LT |
667 | } |
668 | ||
669 | lock_page(page); | |
670 | data = page_address(page); | |
671 | if (file_pos == 0) { | |
672 | struct reiserfs_xattr_header *rxh = | |
673 | (struct reiserfs_xattr_header *)data; | |
674 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
675 | chunk -= skip; | |
676 | /* Magic doesn't match up.. */ | |
677 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { | |
678 | unlock_page(page); | |
679 | reiserfs_put_page(page); | |
a72bdb1c | 680 | reiserfs_warning(inode->i_sb, "jdm-20001", |
bd4c625c LT |
681 | "Invalid magic for xattr (%s) " |
682 | "associated with %k", name, | |
683 | INODE_PKEY(inode)); | |
684 | err = -EIO; | |
8b6dd72a | 685 | goto out_unlock; |
bd4c625c LT |
686 | } |
687 | hash = le32_to_cpu(rxh->h_hash); | |
688 | } | |
689 | memcpy(buffer + buffer_pos, data + skip, chunk); | |
690 | unlock_page(page); | |
691 | reiserfs_put_page(page); | |
692 | file_pos += chunk; | |
693 | buffer_pos += chunk; | |
694 | skip = 0; | |
695 | } | |
696 | err = isize - sizeof(struct reiserfs_xattr_header); | |
697 | ||
698 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != | |
699 | hash) { | |
a72bdb1c | 700 | reiserfs_warning(inode->i_sb, "jdm-20002", |
bd4c625c LT |
701 | "Invalid hash for xattr (%s) associated " |
702 | "with %k", name, INODE_PKEY(inode)); | |
703 | err = -EIO; | |
704 | } | |
705 | ||
8b6dd72a JM |
706 | out_unlock: |
707 | up_read(&REISERFS_I(inode)->i_xattr_sem); | |
3227e14c | 708 | dput(dentry); |
bd4c625c | 709 | |
a72bdb1c | 710 | out: |
bd4c625c | 711 | return err; |
1da177e4 LT |
712 | } |
713 | ||
48b32a35 JM |
714 | /* |
715 | * In order to implement different sets of xattr operations for each xattr | |
716 | * prefix with the generic xattr API, a filesystem should create a | |
717 | * null-terminated array of struct xattr_handler (one for each prefix) and | |
718 | * hang a pointer to it off of the s_xattr field of the superblock. | |
719 | * | |
720 | * The generic_fooxattr() functions will use this list to dispatch xattr | |
721 | * operations to the correct xattr_handler. | |
722 | */ | |
723 | #define for_each_xattr_handler(handlers, handler) \ | |
724 | for ((handler) = *(handlers)++; \ | |
725 | (handler) != NULL; \ | |
726 | (handler) = *(handlers)++) | |
1da177e4 | 727 | |
48b32a35 JM |
728 | /* This is the implementation for the xattr plugin infrastructure */ |
729 | static inline struct xattr_handler * | |
730 | find_xattr_handler_prefix(struct xattr_handler **handlers, | |
731 | const char *name) | |
1da177e4 | 732 | { |
48b32a35 | 733 | struct xattr_handler *xah; |
bd4c625c | 734 | |
48b32a35 JM |
735 | if (!handlers) |
736 | return NULL; | |
bd4c625c | 737 | |
48b32a35 JM |
738 | for_each_xattr_handler(handlers, xah) { |
739 | if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0) | |
740 | break; | |
bd4c625c LT |
741 | } |
742 | ||
48b32a35 | 743 | return xah; |
bd4c625c | 744 | } |
1da177e4 | 745 | |
1da177e4 LT |
746 | |
747 | /* | |
748 | * Inode operation getxattr() | |
1da177e4 LT |
749 | */ |
750 | ssize_t | |
bd4c625c LT |
751 | reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, |
752 | size_t size) | |
1da177e4 | 753 | { |
48b32a35 | 754 | struct xattr_handler *handler; |
bd4c625c | 755 | |
431547b3 | 756 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 757 | |
431547b3 | 758 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c LT |
759 | return -EOPNOTSUPP; |
760 | ||
431547b3 | 761 | return handler->get(dentry, name, buffer, size, handler->flags); |
1da177e4 LT |
762 | } |
763 | ||
1da177e4 LT |
764 | /* |
765 | * Inode operation setxattr() | |
766 | * | |
1b1dcc1b | 767 | * dentry->d_inode->i_mutex down |
1da177e4 LT |
768 | */ |
769 | int | |
bd4c625c LT |
770 | reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
771 | size_t size, int flags) | |
1da177e4 | 772 | { |
48b32a35 | 773 | struct xattr_handler *handler; |
bd4c625c | 774 | |
431547b3 | 775 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 776 | |
431547b3 | 777 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c LT |
778 | return -EOPNOTSUPP; |
779 | ||
431547b3 | 780 | return handler->set(dentry, name, value, size, flags, handler->flags); |
1da177e4 LT |
781 | } |
782 | ||
783 | /* | |
784 | * Inode operation removexattr() | |
785 | * | |
1b1dcc1b | 786 | * dentry->d_inode->i_mutex down |
1da177e4 | 787 | */ |
bd4c625c | 788 | int reiserfs_removexattr(struct dentry *dentry, const char *name) |
1da177e4 | 789 | { |
48b32a35 | 790 | struct xattr_handler *handler; |
431547b3 | 791 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
1da177e4 | 792 | |
431547b3 | 793 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c | 794 | return -EOPNOTSUPP; |
1da177e4 | 795 | |
431547b3 | 796 | return handler->set(dentry, name, NULL, 0, XATTR_REPLACE, handler->flags); |
1da177e4 LT |
797 | } |
798 | ||
48b32a35 JM |
799 | struct listxattr_buf { |
800 | size_t size; | |
801 | size_t pos; | |
802 | char *buf; | |
431547b3 | 803 | struct dentry *dentry; |
1da177e4 LT |
804 | }; |
805 | ||
48b32a35 JM |
806 | static int listxattr_filler(void *buf, const char *name, int namelen, |
807 | loff_t offset, u64 ino, unsigned int d_type) | |
1da177e4 | 808 | { |
48b32a35 JM |
809 | struct listxattr_buf *b = (struct listxattr_buf *)buf; |
810 | size_t size; | |
811 | if (name[0] != '.' || | |
812 | (namelen != 1 && (name[1] != '.' || namelen != 2))) { | |
813 | struct xattr_handler *handler; | |
431547b3 | 814 | handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr, |
48b32a35 JM |
815 | name); |
816 | if (!handler) /* Unsupported xattr name */ | |
817 | return 0; | |
818 | if (b->buf) { | |
431547b3 CH |
819 | size = handler->list(b->dentry, b->buf + b->pos, |
820 | b->size, name, namelen, | |
821 | handler->flags); | |
48b32a35 JM |
822 | if (size > b->size) |
823 | return -ERANGE; | |
824 | } else { | |
431547b3 CH |
825 | size = handler->list(b->dentry, NULL, 0, name, |
826 | namelen, handler->flags); | |
bd4c625c | 827 | } |
bd4c625c | 828 | |
48b32a35 JM |
829 | b->pos += size; |
830 | } | |
bd4c625c | 831 | return 0; |
1da177e4 | 832 | } |
bd4c625c | 833 | |
1da177e4 LT |
834 | /* |
835 | * Inode operation listxattr() | |
836 | * | |
48b32a35 JM |
837 | * We totally ignore the generic listxattr here because it would be stupid |
838 | * not to. Since the xattrs are organized in a directory, we can just | |
839 | * readdir to find them. | |
1da177e4 | 840 | */ |
bd4c625c | 841 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
1da177e4 | 842 | { |
bd4c625c LT |
843 | struct dentry *dir; |
844 | int err = 0; | |
a41f1a47 | 845 | loff_t pos = 0; |
48b32a35 | 846 | struct listxattr_buf buf = { |
431547b3 | 847 | .dentry = dentry, |
48b32a35 JM |
848 | .buf = buffer, |
849 | .size = buffer ? size : 0, | |
850 | }; | |
bd4c625c LT |
851 | |
852 | if (!dentry->d_inode) | |
853 | return -EINVAL; | |
854 | ||
677c9b2e | 855 | if (!dentry->d_sb->s_xattr || |
bd4c625c LT |
856 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
857 | return -EOPNOTSUPP; | |
858 | ||
6c17675e | 859 | dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE); |
bd4c625c LT |
860 | if (IS_ERR(dir)) { |
861 | err = PTR_ERR(dir); | |
862 | if (err == -ENODATA) | |
48b32a35 | 863 | err = 0; /* Not an error if there aren't any xattrs */ |
bd4c625c LT |
864 | goto out; |
865 | } | |
866 | ||
6c17675e | 867 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
a41f1a47 | 868 | err = reiserfs_readdir_dentry(dir, &buf, listxattr_filler, &pos); |
6c17675e | 869 | mutex_unlock(&dir->d_inode->i_mutex); |
bd4c625c | 870 | |
48b32a35 JM |
871 | if (!err) |
872 | err = buf.pos; | |
bd4c625c | 873 | |
3227e14c | 874 | dput(dir); |
8b6dd72a | 875 | out: |
bd4c625c | 876 | return err; |
1da177e4 LT |
877 | } |
878 | ||
a72bdb1c | 879 | static int reiserfs_check_acl(struct inode *inode, int mask) |
1da177e4 | 880 | { |
a72bdb1c JM |
881 | struct posix_acl *acl; |
882 | int error = -EAGAIN; /* do regular unix permission checks by default */ | |
bd4c625c | 883 | |
a72bdb1c JM |
884 | acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS); |
885 | ||
a72bdb1c JM |
886 | if (acl) { |
887 | if (!IS_ERR(acl)) { | |
888 | error = posix_acl_permission(inode, acl, mask); | |
889 | posix_acl_release(acl); | |
890 | } else if (PTR_ERR(acl) != -ENODATA) | |
891 | error = PTR_ERR(acl); | |
bd4c625c LT |
892 | } |
893 | ||
a72bdb1c | 894 | return error; |
1da177e4 LT |
895 | } |
896 | ||
a72bdb1c | 897 | static int create_privroot(struct dentry *dentry) |
1da177e4 | 898 | { |
a72bdb1c JM |
899 | int err; |
900 | struct inode *inode = dentry->d_parent->d_inode; | |
5a6059c3 JM |
901 | WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex)); |
902 | ||
6c17675e | 903 | err = xattr_mkdir(inode, dentry, 0700); |
edcc37a0 AV |
904 | if (err || !dentry->d_inode) { |
905 | reiserfs_warning(dentry->d_sb, "jdm-20006", | |
906 | "xattrs/ACLs enabled and couldn't " | |
907 | "find/create .reiserfs_priv. " | |
908 | "Failing mount."); | |
909 | return -EOPNOTSUPP; | |
bd4c625c LT |
910 | } |
911 | ||
edcc37a0 AV |
912 | dentry->d_inode->i_flags |= S_PRIVATE; |
913 | reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr " | |
914 | "storage.\n", PRIVROOT_NAME); | |
bd4c625c | 915 | |
edcc37a0 | 916 | return 0; |
1da177e4 LT |
917 | } |
918 | ||
12abb35a JM |
919 | #else |
920 | int __init reiserfs_xattr_register_handlers(void) { return 0; } | |
921 | void reiserfs_xattr_unregister_handlers(void) {} | |
922 | static int create_privroot(struct dentry *dentry) { return 0; } | |
923 | #endif | |
924 | ||
925 | /* Actual operations that are exported to VFS-land */ | |
926 | struct xattr_handler *reiserfs_xattr_handlers[] = { | |
927 | #ifdef CONFIG_REISERFS_FS_XATTR | |
928 | &reiserfs_xattr_user_handler, | |
929 | &reiserfs_xattr_trusted_handler, | |
930 | #endif | |
931 | #ifdef CONFIG_REISERFS_FS_SECURITY | |
932 | &reiserfs_xattr_security_handler, | |
933 | #endif | |
934 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL | |
935 | &reiserfs_posix_acl_access_handler, | |
936 | &reiserfs_posix_acl_default_handler, | |
937 | #endif | |
938 | NULL | |
939 | }; | |
940 | ||
a72bdb1c | 941 | static int xattr_mount_check(struct super_block *s) |
1da177e4 | 942 | { |
a72bdb1c JM |
943 | /* We need generation numbers to ensure that the oid mapping is correct |
944 | * v3.5 filesystems don't have them. */ | |
48b32a35 JM |
945 | if (old_format_only(s)) { |
946 | if (reiserfs_xattrs_optional(s)) { | |
947 | /* Old format filesystem, but optional xattrs have | |
948 | * been enabled. Error out. */ | |
949 | reiserfs_warning(s, "jdm-2005", | |
950 | "xattrs/ACLs not supported " | |
951 | "on pre-v3.6 format filesystems. " | |
952 | "Failing mount."); | |
953 | return -EOPNOTSUPP; | |
954 | } | |
a72bdb1c JM |
955 | } |
956 | ||
957 | return 0; | |
1da177e4 LT |
958 | } |
959 | ||
b83674c0 JM |
960 | int reiserfs_permission(struct inode *inode, int mask) |
961 | { | |
962 | /* | |
963 | * We don't do permission checks on the internal objects. | |
964 | * Permissions are determined by the "owning" object. | |
965 | */ | |
966 | if (IS_PRIVATE(inode)) | |
967 | return 0; | |
968 | ||
969 | #ifdef CONFIG_REISERFS_FS_XATTR | |
970 | /* | |
971 | * Stat data v1 doesn't support ACLs. | |
972 | */ | |
973 | if (get_inode_sd_version(inode) != STAT_DATA_V1) | |
974 | return generic_permission(inode, mask, reiserfs_check_acl); | |
975 | #endif | |
976 | return generic_permission(inode, mask, NULL); | |
977 | } | |
978 | ||
1da177e4 LT |
979 | /* This will catch lookups from the fs root to .reiserfs_priv */ |
980 | static int | |
bd4c625c | 981 | xattr_lookup_poison(struct dentry *dentry, struct qstr *q1, struct qstr *name) |
1da177e4 | 982 | { |
bd4c625c | 983 | struct dentry *priv_root = REISERFS_SB(dentry->d_sb)->priv_root; |
edcc37a0 | 984 | if (container_of(q1, struct dentry, d_name) == priv_root) |
bd4c625c | 985 | return -ENOENT; |
edcc37a0 | 986 | if (q1->len == name->len && |
bd4c625c LT |
987 | !memcmp(q1->name, name->name, name->len)) |
988 | return 0; | |
989 | return 1; | |
1da177e4 LT |
990 | } |
991 | ||
e16404ed | 992 | static const struct dentry_operations xattr_lookup_poison_ops = { |
bd4c625c | 993 | .d_compare = xattr_lookup_poison, |
1da177e4 LT |
994 | }; |
995 | ||
edcc37a0 AV |
996 | int reiserfs_lookup_privroot(struct super_block *s) |
997 | { | |
998 | struct dentry *dentry; | |
999 | int err = 0; | |
1000 | ||
1001 | /* If we don't have the privroot located yet - go find it */ | |
c72e0575 | 1002 | reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s); |
edcc37a0 AV |
1003 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, |
1004 | strlen(PRIVROOT_NAME)); | |
1005 | if (!IS_ERR(dentry)) { | |
1006 | REISERFS_SB(s)->priv_root = dentry; | |
73422811 JM |
1007 | if (!reiserfs_expose_privroot(s)) |
1008 | s->s_root->d_op = &xattr_lookup_poison_ops; | |
edcc37a0 AV |
1009 | if (dentry->d_inode) |
1010 | dentry->d_inode->i_flags |= S_PRIVATE; | |
1011 | } else | |
1012 | err = PTR_ERR(dentry); | |
1013 | mutex_unlock(&s->s_root->d_inode->i_mutex); | |
1014 | ||
1015 | return err; | |
1016 | } | |
1017 | ||
1da177e4 LT |
1018 | /* We need to take a copy of the mount flags since things like |
1019 | * MS_RDONLY don't get set until *after* we're called. | |
1020 | * mount_flags != mount_options */ | |
bd4c625c | 1021 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
1da177e4 | 1022 | { |
bd4c625c | 1023 | int err = 0; |
ab17c4f0 | 1024 | struct dentry *privroot = REISERFS_SB(s)->priv_root; |
bd4c625c | 1025 | |
a72bdb1c JM |
1026 | err = xattr_mount_check(s); |
1027 | if (err) | |
bd4c625c | 1028 | goto error; |
bd4c625c | 1029 | |
ab17c4f0 | 1030 | if (!privroot->d_inode && !(mount_flags & MS_RDONLY)) { |
ae635c0b | 1031 | reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s); |
edcc37a0 | 1032 | err = create_privroot(REISERFS_SB(s)->priv_root); |
5a6059c3 | 1033 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
bd4c625c | 1034 | } |
ab17c4f0 JM |
1035 | |
1036 | if (privroot->d_inode) { | |
48b32a35 | 1037 | s->s_xattr = reiserfs_xattr_handlers; |
c72e0575 | 1038 | reiserfs_mutex_lock_safe(&privroot->d_inode->i_mutex, s); |
ab17c4f0 JM |
1039 | if (!REISERFS_SB(s)->xattr_root) { |
1040 | struct dentry *dentry; | |
1041 | dentry = lookup_one_len(XAROOT_NAME, privroot, | |
1042 | strlen(XAROOT_NAME)); | |
1043 | if (!IS_ERR(dentry)) | |
1044 | REISERFS_SB(s)->xattr_root = dentry; | |
1045 | else | |
1046 | err = PTR_ERR(dentry); | |
1047 | } | |
1048 | mutex_unlock(&privroot->d_inode->i_mutex); | |
1049 | } | |
48b32a35 | 1050 | |
a72bdb1c | 1051 | error: |
bd4c625c | 1052 | if (err) { |
bd4c625c LT |
1053 | clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt)); |
1054 | clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt)); | |
1055 | } | |
1056 | ||
1057 | /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */ | |
bd4c625c LT |
1058 | if (reiserfs_posixacl(s)) |
1059 | s->s_flags |= MS_POSIXACL; | |
ab17c4f0 | 1060 | else |
ab17c4f0 | 1061 | s->s_flags &= ~MS_POSIXACL; |
bd4c625c LT |
1062 | |
1063 | return err; | |
1da177e4 | 1064 | } |