Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/reiserfs/xattr.c | |
3 | * | |
4 | * Copyright (c) 2002 by Jeff Mahoney, <jeffm@suse.com> | |
5 | * | |
6 | */ | |
7 | ||
8 | /* | |
9 | * In order to implement EA/ACLs in a clean, backwards compatible manner, | |
10 | * they are implemented as files in a "private" directory. | |
11 | * Each EA is in it's own file, with the directory layout like so (/ is assumed | |
12 | * to be relative to fs root). Inside the /.reiserfs_priv/xattrs directory, | |
13 | * directories named using the capital-hex form of the objectid and | |
14 | * generation number are used. Inside each directory are individual files | |
15 | * named with the name of the extended attribute. | |
16 | * | |
17 | * So, for objectid 12648430, we could have: | |
18 | * /.reiserfs_priv/xattrs/C0FFEE.0/system.posix_acl_access | |
19 | * /.reiserfs_priv/xattrs/C0FFEE.0/system.posix_acl_default | |
20 | * /.reiserfs_priv/xattrs/C0FFEE.0/user.Content-Type | |
21 | * .. or similar. | |
22 | * | |
23 | * The file contents are the text of the EA. The size is known based on the | |
24 | * stat data describing the file. | |
25 | * | |
26 | * In the case of system.posix_acl_access and system.posix_acl_default, since | |
27 | * these are special cases for filesystem ACLs, they are interpreted by the | |
28 | * kernel, in addition, they are negatively and positively cached and attached | |
29 | * to the inode so that unnecessary lookups are avoided. | |
d984561b JM |
30 | * |
31 | * Locking works like so: | |
8b6dd72a JM |
32 | * Directory components (xattr root, xattr dir) are protectd by their i_mutex. |
33 | * The xattrs themselves are protected by the xattr_sem. | |
1da177e4 LT |
34 | */ |
35 | ||
f466c6fd | 36 | #include "reiserfs.h" |
16f7e0fe | 37 | #include <linux/capability.h> |
1da177e4 LT |
38 | #include <linux/dcache.h> |
39 | #include <linux/namei.h> | |
40 | #include <linux/errno.h> | |
5a0e3ad6 | 41 | #include <linux/gfp.h> |
1da177e4 LT |
42 | #include <linux/fs.h> |
43 | #include <linux/file.h> | |
44 | #include <linux/pagemap.h> | |
45 | #include <linux/xattr.h> | |
c45ac888 | 46 | #include "xattr.h" |
a3063ab8 | 47 | #include "acl.h" |
1da177e4 | 48 | #include <asm/uaccess.h> |
3277c39f | 49 | #include <net/checksum.h> |
1da177e4 | 50 | #include <linux/stat.h> |
6c17675e | 51 | #include <linux/quotaops.h> |
431547b3 | 52 | #include <linux/security.h> |
47f70d08 | 53 | #include <linux/posix_acl_xattr.h> |
1da177e4 | 54 | |
1da177e4 LT |
55 | #define PRIVROOT_NAME ".reiserfs_priv" |
56 | #define XAROOT_NAME "xattrs" | |
57 | ||
1da177e4 | 58 | |
098297b2 JM |
59 | /* |
60 | * Helpers for inode ops. We do this so that we don't have all the VFS | |
6c17675e | 61 | * overhead and also for proper i_mutex annotation. |
098297b2 JM |
62 | * dir->i_mutex must be held for all of them. |
63 | */ | |
3a355cc6 | 64 | #ifdef CONFIG_REISERFS_FS_XATTR |
6c17675e | 65 | static int xattr_create(struct inode *dir, struct dentry *dentry, int mode) |
1da177e4 | 66 | { |
6c17675e | 67 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
ebfc3b49 | 68 | return dir->i_op->create(dir, dentry, mode, true); |
6c17675e | 69 | } |
3a355cc6 | 70 | #endif |
bd4c625c | 71 | |
18bb1db3 | 72 | static int xattr_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
6c17675e JM |
73 | { |
74 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); | |
6c17675e JM |
75 | return dir->i_op->mkdir(dir, dentry, mode); |
76 | } | |
bd4c625c | 77 | |
098297b2 JM |
78 | /* |
79 | * We use I_MUTEX_CHILD here to silence lockdep. It's safe because xattr | |
6c17675e JM |
80 | * mutation ops aren't called during rename or splace, which are the |
81 | * only other users of I_MUTEX_CHILD. It violates the ordering, but that's | |
098297b2 JM |
82 | * better than allocating another subclass just for this code. |
83 | */ | |
6c17675e JM |
84 | static int xattr_unlink(struct inode *dir, struct dentry *dentry) |
85 | { | |
86 | int error; | |
87 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); | |
bd4c625c | 88 | |
4c05141d | 89 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD); |
6c17675e JM |
90 | error = dir->i_op->unlink(dir, dentry); |
91 | mutex_unlock(&dentry->d_inode->i_mutex); | |
92 | ||
93 | if (!error) | |
94 | d_delete(dentry); | |
95 | return error; | |
96 | } | |
97 | ||
98 | static int xattr_rmdir(struct inode *dir, struct dentry *dentry) | |
99 | { | |
100 | int error; | |
101 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); | |
6c17675e | 102 | |
4c05141d | 103 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD); |
6c17675e JM |
104 | error = dir->i_op->rmdir(dir, dentry); |
105 | if (!error) | |
106 | dentry->d_inode->i_flags |= S_DEAD; | |
107 | mutex_unlock(&dentry->d_inode->i_mutex); | |
108 | if (!error) | |
109 | d_delete(dentry); | |
6c17675e JM |
110 | |
111 | return error; | |
112 | } | |
113 | ||
6c17675e JM |
114 | #define xattr_may_create(flags) (!flags || flags & XATTR_CREATE) |
115 | ||
ab17c4f0 | 116 | static struct dentry *open_xa_root(struct super_block *sb, int flags) |
6c17675e | 117 | { |
ab17c4f0 JM |
118 | struct dentry *privroot = REISERFS_SB(sb)->priv_root; |
119 | struct dentry *xaroot; | |
120 | if (!privroot->d_inode) | |
121 | return ERR_PTR(-ENODATA); | |
6c17675e | 122 | |
ab17c4f0 | 123 | mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR); |
6c17675e | 124 | |
ab17c4f0 | 125 | xaroot = dget(REISERFS_SB(sb)->xattr_root); |
ceb5edc4 JM |
126 | if (!xaroot) |
127 | xaroot = ERR_PTR(-ENODATA); | |
128 | else if (!xaroot->d_inode) { | |
ab17c4f0 | 129 | int err = -ENODATA; |
5a6059c3 | 130 | if (xattr_may_create(flags)) |
ab17c4f0 | 131 | err = xattr_mkdir(privroot->d_inode, xaroot, 0700); |
9b7f3755 | 132 | if (err) { |
ab17c4f0 JM |
133 | dput(xaroot); |
134 | xaroot = ERR_PTR(err); | |
9b7f3755 | 135 | } |
bd4c625c | 136 | } |
6c17675e | 137 | |
ab17c4f0 JM |
138 | mutex_unlock(&privroot->d_inode->i_mutex); |
139 | return xaroot; | |
1da177e4 LT |
140 | } |
141 | ||
bd4c625c | 142 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
1da177e4 | 143 | { |
bd4c625c LT |
144 | struct dentry *xaroot, *xadir; |
145 | char namebuf[17]; | |
146 | ||
6c17675e | 147 | xaroot = open_xa_root(inode->i_sb, flags); |
9b7f3755 | 148 | if (IS_ERR(xaroot)) |
bd4c625c | 149 | return xaroot; |
bd4c625c | 150 | |
bd4c625c LT |
151 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
152 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), | |
153 | inode->i_generation); | |
bd4c625c | 154 | |
ab17c4f0 JM |
155 | mutex_lock_nested(&xaroot->d_inode->i_mutex, I_MUTEX_XATTR); |
156 | ||
157 | xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf)); | |
158 | if (!IS_ERR(xadir) && !xadir->d_inode) { | |
159 | int err = -ENODATA; | |
160 | if (xattr_may_create(flags)) | |
161 | err = xattr_mkdir(xaroot->d_inode, xadir, 0700); | |
162 | if (err) { | |
163 | dput(xadir); | |
164 | xadir = ERR_PTR(err); | |
165 | } | |
166 | } | |
167 | ||
168 | mutex_unlock(&xaroot->d_inode->i_mutex); | |
bd4c625c LT |
169 | dput(xaroot); |
170 | return xadir; | |
1da177e4 LT |
171 | } |
172 | ||
098297b2 JM |
173 | /* |
174 | * The following are side effects of other operations that aren't explicitly | |
48b32a35 | 175 | * modifying extended attributes. This includes operations such as permissions |
098297b2 JM |
176 | * or ownership changes, object deletions, etc. |
177 | */ | |
a41f1a47 | 178 | struct reiserfs_dentry_buf { |
4acf381e | 179 | struct dir_context ctx; |
a41f1a47 JM |
180 | struct dentry *xadir; |
181 | int count; | |
182 | struct dentry *dentries[8]; | |
183 | }; | |
bd4c625c | 184 | |
a72bdb1c | 185 | static int |
a41f1a47 JM |
186 | fill_with_dentries(void *buf, const char *name, int namelen, loff_t offset, |
187 | u64 ino, unsigned int d_type) | |
a72bdb1c | 188 | { |
a41f1a47 | 189 | struct reiserfs_dentry_buf *dbuf = buf; |
a72bdb1c | 190 | struct dentry *dentry; |
5a6059c3 | 191 | WARN_ON_ONCE(!mutex_is_locked(&dbuf->xadir->d_inode->i_mutex)); |
bd4c625c | 192 | |
a41f1a47 JM |
193 | if (dbuf->count == ARRAY_SIZE(dbuf->dentries)) |
194 | return -ENOSPC; | |
bd4c625c | 195 | |
35e5cbc0 JK |
196 | if (name[0] == '.' && (namelen < 2 || |
197 | (namelen == 2 && name[1] == '.'))) | |
a41f1a47 | 198 | return 0; |
bd4c625c | 199 | |
a41f1a47 | 200 | dentry = lookup_one_len(name, dbuf->xadir, namelen); |
a72bdb1c | 201 | if (IS_ERR(dentry)) { |
a41f1a47 | 202 | return PTR_ERR(dentry); |
a72bdb1c | 203 | } else if (!dentry->d_inode) { |
a41f1a47 JM |
204 | /* A directory entry exists, but no file? */ |
205 | reiserfs_error(dentry->d_sb, "xattr-20003", | |
206 | "Corrupted directory: xattr %s listed but " | |
207 | "not found for file %s.\n", | |
208 | dentry->d_name.name, dbuf->xadir->d_name.name); | |
209 | dput(dentry); | |
210 | return -EIO; | |
bd4c625c | 211 | } |
1da177e4 | 212 | |
a41f1a47 JM |
213 | dbuf->dentries[dbuf->count++] = dentry; |
214 | return 0; | |
1da177e4 LT |
215 | } |
216 | ||
a41f1a47 JM |
217 | static void |
218 | cleanup_dentry_buf(struct reiserfs_dentry_buf *buf) | |
1da177e4 | 219 | { |
a41f1a47 JM |
220 | int i; |
221 | for (i = 0; i < buf->count; i++) | |
222 | if (buf->dentries[i]) | |
223 | dput(buf->dentries[i]); | |
a72bdb1c JM |
224 | } |
225 | ||
a41f1a47 JM |
226 | static int reiserfs_for_each_xattr(struct inode *inode, |
227 | int (*action)(struct dentry *, void *), | |
228 | void *data) | |
a72bdb1c | 229 | { |
a41f1a47 JM |
230 | struct dentry *dir; |
231 | int i, err = 0; | |
a41f1a47 | 232 | struct reiserfs_dentry_buf buf = { |
4acf381e | 233 | .ctx.actor = fill_with_dentries, |
a41f1a47 | 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 | |
6c17675e | 240 | dir = open_xa_dir(inode, XATTR_REPLACE); |
a72bdb1c JM |
241 | if (IS_ERR(dir)) { |
242 | err = PTR_ERR(dir); | |
243 | goto out; | |
244 | } else if (!dir->d_inode) { | |
a41f1a47 JM |
245 | err = 0; |
246 | goto out_dir; | |
a72bdb1c | 247 | } |
1da177e4 | 248 | |
6c17675e | 249 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
27026a05 | 250 | |
a41f1a47 | 251 | buf.xadir = dir; |
cd62cdae AV |
252 | while (1) { |
253 | err = reiserfs_readdir_inode(dir->d_inode, &buf.ctx); | |
254 | if (err) | |
255 | break; | |
256 | if (!buf.count) | |
257 | break; | |
258 | for (i = 0; !err && i < buf.count && buf.dentries[i]; i++) { | |
a41f1a47 | 259 | struct dentry *dentry = buf.dentries[i]; |
1da177e4 | 260 | |
cd62cdae AV |
261 | if (!S_ISDIR(dentry->d_inode->i_mode)) |
262 | err = action(dentry, data); | |
1da177e4 | 263 | |
a41f1a47 JM |
264 | dput(dentry); |
265 | buf.dentries[i] = NULL; | |
bd4c625c | 266 | } |
cd62cdae AV |
267 | if (err) |
268 | break; | |
a41f1a47 | 269 | buf.count = 0; |
8b6dd72a | 270 | } |
a41f1a47 | 271 | mutex_unlock(&dir->d_inode->i_mutex); |
1da177e4 | 272 | |
a41f1a47 | 273 | cleanup_dentry_buf(&buf); |
1da177e4 | 274 | |
d984561b | 275 | if (!err) { |
098297b2 JM |
276 | /* |
277 | * We start a transaction here to avoid a ABBA situation | |
a41f1a47 JM |
278 | * between the xattr root's i_mutex and the journal lock. |
279 | * This doesn't incur much additional overhead since the | |
280 | * new transaction will just nest inside the | |
098297b2 JM |
281 | * outer transaction. |
282 | */ | |
a41f1a47 JM |
283 | int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + |
284 | 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); | |
285 | struct reiserfs_transaction_handle th; | |
4c05141d | 286 | reiserfs_write_lock(inode->i_sb); |
a41f1a47 | 287 | err = journal_begin(&th, inode->i_sb, blocks); |
4c05141d | 288 | reiserfs_write_unlock(inode->i_sb); |
a41f1a47 JM |
289 | if (!err) { |
290 | int jerror; | |
4c05141d JM |
291 | mutex_lock_nested(&dir->d_parent->d_inode->i_mutex, |
292 | I_MUTEX_XATTR); | |
a41f1a47 | 293 | err = action(dir, data); |
4c05141d | 294 | reiserfs_write_lock(inode->i_sb); |
a41f1a47 | 295 | jerror = journal_end(&th, inode->i_sb, blocks); |
4c05141d | 296 | reiserfs_write_unlock(inode->i_sb); |
a41f1a47 JM |
297 | mutex_unlock(&dir->d_parent->d_inode->i_mutex); |
298 | err = jerror ?: err; | |
299 | } | |
a72bdb1c | 300 | } |
a41f1a47 JM |
301 | out_dir: |
302 | dput(dir); | |
a72bdb1c | 303 | out: |
a41f1a47 JM |
304 | /* -ENODATA isn't an error */ |
305 | if (err == -ENODATA) | |
306 | err = 0; | |
a72bdb1c JM |
307 | return err; |
308 | } | |
1da177e4 | 309 | |
a41f1a47 | 310 | static int delete_one_xattr(struct dentry *dentry, void *data) |
a72bdb1c | 311 | { |
a41f1a47 | 312 | struct inode *dir = dentry->d_parent->d_inode; |
1da177e4 | 313 | |
a41f1a47 JM |
314 | /* This is the xattr dir, handle specially. */ |
315 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
316 | return xattr_rmdir(dir, dentry); | |
1da177e4 | 317 | |
a41f1a47 JM |
318 | return xattr_unlink(dir, dentry); |
319 | } | |
bd4c625c | 320 | |
a41f1a47 JM |
321 | static int chown_one_xattr(struct dentry *dentry, void *data) |
322 | { | |
323 | struct iattr *attrs = data; | |
4a857011 JM |
324 | int ia_valid = attrs->ia_valid; |
325 | int err; | |
326 | ||
327 | /* | |
328 | * We only want the ownership bits. Otherwise, we'll do | |
329 | * things like change a directory to a regular file if | |
330 | * ATTR_MODE is set. | |
331 | */ | |
332 | attrs->ia_valid &= (ATTR_UID|ATTR_GID); | |
333 | err = reiserfs_setattr(dentry, attrs); | |
334 | attrs->ia_valid = ia_valid; | |
335 | ||
336 | return err; | |
a41f1a47 | 337 | } |
1da177e4 | 338 | |
a41f1a47 JM |
339 | /* No i_mutex, but the inode is unconnected. */ |
340 | int reiserfs_delete_xattrs(struct inode *inode) | |
341 | { | |
342 | int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); | |
343 | if (err) | |
344 | reiserfs_warning(inode->i_sb, "jdm-20004", | |
345 | "Couldn't delete all xattrs (%d)\n", err); | |
a72bdb1c JM |
346 | return err; |
347 | } | |
1da177e4 | 348 | |
a41f1a47 | 349 | /* inode->i_mutex: down */ |
a72bdb1c JM |
350 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
351 | { | |
a41f1a47 | 352 | int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); |
8b6dd72a JM |
353 | if (err) |
354 | reiserfs_warning(inode->i_sb, "jdm-20007", | |
355 | "Couldn't chown all xattrs (%d)\n", err); | |
a72bdb1c | 356 | return err; |
1da177e4 LT |
357 | } |
358 | ||
a72bdb1c | 359 | #ifdef CONFIG_REISERFS_FS_XATTR |
098297b2 JM |
360 | /* |
361 | * Returns a dentry corresponding to a specific extended attribute file | |
a72bdb1c | 362 | * for the inode. If flags allow, the file is created. Otherwise, a |
098297b2 JM |
363 | * valid or negative dentry, or an error is returned. |
364 | */ | |
48b32a35 JM |
365 | static struct dentry *xattr_lookup(struct inode *inode, const char *name, |
366 | int flags) | |
1da177e4 | 367 | { |
a72bdb1c JM |
368 | struct dentry *xadir, *xafile; |
369 | int err = 0; | |
370 | ||
371 | xadir = open_xa_dir(inode, flags); | |
6c17675e | 372 | if (IS_ERR(xadir)) |
a72bdb1c | 373 | return ERR_CAST(xadir); |
a72bdb1c | 374 | |
5a6059c3 | 375 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
a72bdb1c JM |
376 | xafile = lookup_one_len(name, xadir, strlen(name)); |
377 | if (IS_ERR(xafile)) { | |
6c17675e JM |
378 | err = PTR_ERR(xafile); |
379 | goto out; | |
bd4c625c | 380 | } |
a72bdb1c | 381 | |
6c17675e JM |
382 | if (xafile->d_inode && (flags & XATTR_CREATE)) |
383 | err = -EEXIST; | |
a72bdb1c | 384 | |
6c17675e JM |
385 | if (!xafile->d_inode) { |
386 | err = -ENODATA; | |
5a6059c3 | 387 | if (xattr_may_create(flags)) |
6c17675e JM |
388 | err = xattr_create(xadir->d_inode, xafile, |
389 | 0700|S_IFREG); | |
a72bdb1c JM |
390 | } |
391 | ||
6c17675e JM |
392 | if (err) |
393 | dput(xafile); | |
a72bdb1c | 394 | out: |
5a6059c3 | 395 | mutex_unlock(&xadir->d_inode->i_mutex); |
a72bdb1c JM |
396 | dput(xadir); |
397 | if (err) | |
6c17675e | 398 | return ERR_PTR(err); |
a72bdb1c | 399 | return xafile; |
1da177e4 LT |
400 | } |
401 | ||
1da177e4 | 402 | /* Internal operations on file data */ |
bd4c625c | 403 | static inline void reiserfs_put_page(struct page *page) |
1da177e4 | 404 | { |
bd4c625c LT |
405 | kunmap(page); |
406 | page_cache_release(page); | |
1da177e4 LT |
407 | } |
408 | ||
ec6ea56b | 409 | static struct page *reiserfs_get_page(struct inode *dir, size_t n) |
1da177e4 | 410 | { |
bd4c625c LT |
411 | struct address_space *mapping = dir->i_mapping; |
412 | struct page *page; | |
098297b2 JM |
413 | /* |
414 | * We can deadlock if we try to free dentries, | |
415 | * and an unlink/rmdir has just occurred - GFP_NOFS avoids this | |
416 | */ | |
c4cdd038 | 417 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
ec6ea56b | 418 | page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL); |
bd4c625c | 419 | if (!IS_ERR(page)) { |
bd4c625c | 420 | kmap(page); |
bd4c625c LT |
421 | if (PageError(page)) |
422 | goto fail; | |
423 | } | |
424 | return page; | |
425 | ||
426 | fail: | |
427 | reiserfs_put_page(page); | |
428 | return ERR_PTR(-EIO); | |
1da177e4 LT |
429 | } |
430 | ||
bd4c625c | 431 | static inline __u32 xattr_hash(const char *msg, int len) |
1da177e4 | 432 | { |
bd4c625c | 433 | return csum_partial(msg, len, 0); |
1da177e4 LT |
434 | } |
435 | ||
ba9d8cec VS |
436 | int reiserfs_commit_write(struct file *f, struct page *page, |
437 | unsigned from, unsigned to); | |
ba9d8cec | 438 | |
48b32a35 JM |
439 | static void update_ctime(struct inode *inode) |
440 | { | |
441 | struct timespec now = current_fs_time(inode->i_sb); | |
1d3382cb | 442 | if (inode_unhashed(inode) || !inode->i_nlink || |
48b32a35 JM |
443 | timespec_equal(&inode->i_ctime, &now)) |
444 | return; | |
445 | ||
446 | inode->i_ctime = CURRENT_TIME_SEC; | |
447 | mark_inode_dirty(inode); | |
448 | } | |
449 | ||
450 | static int lookup_and_delete_xattr(struct inode *inode, const char *name) | |
451 | { | |
452 | int err = 0; | |
453 | struct dentry *dentry, *xadir; | |
454 | ||
455 | xadir = open_xa_dir(inode, XATTR_REPLACE); | |
456 | if (IS_ERR(xadir)) | |
457 | return PTR_ERR(xadir); | |
458 | ||
5a6059c3 | 459 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
48b32a35 JM |
460 | dentry = lookup_one_len(name, xadir, strlen(name)); |
461 | if (IS_ERR(dentry)) { | |
462 | err = PTR_ERR(dentry); | |
463 | goto out_dput; | |
464 | } | |
465 | ||
466 | if (dentry->d_inode) { | |
48b32a35 | 467 | err = xattr_unlink(xadir->d_inode, dentry); |
48b32a35 JM |
468 | update_ctime(inode); |
469 | } | |
470 | ||
471 | dput(dentry); | |
472 | out_dput: | |
5a6059c3 | 473 | mutex_unlock(&xadir->d_inode->i_mutex); |
48b32a35 JM |
474 | dput(xadir); |
475 | return err; | |
476 | } | |
477 | ||
ba9d8cec | 478 | |
1da177e4 LT |
479 | /* Generic extended attribute operations that can be used by xa plugins */ |
480 | ||
481 | /* | |
1b1dcc1b | 482 | * inode->i_mutex: down |
1da177e4 LT |
483 | */ |
484 | int | |
0ab2621e JM |
485 | reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, |
486 | struct inode *inode, const char *name, | |
487 | const void *buffer, size_t buffer_size, int flags) | |
1da177e4 | 488 | { |
bd4c625c | 489 | int err = 0; |
3227e14c | 490 | struct dentry *dentry; |
bd4c625c LT |
491 | struct page *page; |
492 | char *data; | |
bd4c625c LT |
493 | size_t file_pos = 0; |
494 | size_t buffer_pos = 0; | |
48b32a35 | 495 | size_t new_size; |
bd4c625c LT |
496 | __u32 xahash = 0; |
497 | ||
bd4c625c LT |
498 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
499 | return -EOPNOTSUPP; | |
500 | ||
4f3be1b5 FW |
501 | if (!buffer) { |
502 | err = lookup_and_delete_xattr(inode, name); | |
4f3be1b5 FW |
503 | return err; |
504 | } | |
505 | ||
48b32a35 | 506 | dentry = xattr_lookup(inode, name, flags); |
4c05141d | 507 | if (IS_ERR(dentry)) |
48b32a35 | 508 | return PTR_ERR(dentry); |
3f14fea6 | 509 | |
f3e22f48 | 510 | down_write(&REISERFS_I(inode)->i_xattr_sem); |
bd4c625c | 511 | |
8b6dd72a | 512 | xahash = xattr_hash(buffer, buffer_size); |
bd4c625c LT |
513 | while (buffer_pos < buffer_size || buffer_pos == 0) { |
514 | size_t chunk; | |
515 | size_t skip = 0; | |
516 | size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1)); | |
517 | if (buffer_size - buffer_pos > PAGE_CACHE_SIZE) | |
518 | chunk = PAGE_CACHE_SIZE; | |
519 | else | |
520 | chunk = buffer_size - buffer_pos; | |
521 | ||
ec6ea56b | 522 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
523 | if (IS_ERR(page)) { |
524 | err = PTR_ERR(page); | |
48b32a35 | 525 | goto out_unlock; |
bd4c625c LT |
526 | } |
527 | ||
528 | lock_page(page); | |
529 | data = page_address(page); | |
530 | ||
531 | if (file_pos == 0) { | |
532 | struct reiserfs_xattr_header *rxh; | |
533 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
534 | if (chunk + skip > PAGE_CACHE_SIZE) | |
535 | chunk = PAGE_CACHE_SIZE - skip; | |
536 | rxh = (struct reiserfs_xattr_header *)data; | |
537 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); | |
538 | rxh->h_hash = cpu_to_le32(xahash); | |
539 | } | |
540 | ||
4c05141d | 541 | reiserfs_write_lock(inode->i_sb); |
ebdec241 | 542 | err = __reiserfs_write_begin(page, page_offset, chunk + skip); |
bd4c625c LT |
543 | if (!err) { |
544 | if (buffer) | |
545 | memcpy(data + skip, buffer + buffer_pos, chunk); | |
3227e14c JM |
546 | err = reiserfs_commit_write(NULL, page, page_offset, |
547 | page_offset + chunk + | |
548 | skip); | |
bd4c625c | 549 | } |
4c05141d | 550 | reiserfs_write_unlock(inode->i_sb); |
bd4c625c LT |
551 | unlock_page(page); |
552 | reiserfs_put_page(page); | |
553 | buffer_pos += chunk; | |
554 | file_pos += chunk; | |
555 | skip = 0; | |
556 | if (err || buffer_size == 0 || !buffer) | |
557 | break; | |
558 | } | |
559 | ||
48b32a35 JM |
560 | new_size = buffer_size + sizeof(struct reiserfs_xattr_header); |
561 | if (!err && new_size < i_size_read(dentry->d_inode)) { | |
562 | struct iattr newattrs = { | |
563 | .ia_ctime = current_fs_time(inode->i_sb), | |
fb2162df | 564 | .ia_size = new_size, |
48b32a35 JM |
565 | .ia_valid = ATTR_SIZE | ATTR_CTIME, |
566 | }; | |
31370f62 | 567 | |
48b32a35 | 568 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR); |
bd5fe6c5 | 569 | inode_dio_wait(dentry->d_inode); |
31370f62 | 570 | |
48b32a35 | 571 | err = reiserfs_setattr(dentry, &newattrs); |
48b32a35 JM |
572 | mutex_unlock(&dentry->d_inode->i_mutex); |
573 | } else | |
574 | update_ctime(inode); | |
575 | out_unlock: | |
8b6dd72a | 576 | up_write(&REISERFS_I(inode)->i_xattr_sem); |
3227e14c | 577 | dput(dentry); |
48b32a35 JM |
578 | return err; |
579 | } | |
bd4c625c | 580 | |
0ab2621e JM |
581 | /* We need to start a transaction to maintain lock ordering */ |
582 | int reiserfs_xattr_set(struct inode *inode, const char *name, | |
583 | const void *buffer, size_t buffer_size, int flags) | |
48b32a35 | 584 | { |
0ab2621e JM |
585 | |
586 | struct reiserfs_transaction_handle th; | |
587 | int error, error2; | |
588 | size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size); | |
589 | ||
590 | if (!(flags & XATTR_REPLACE)) | |
591 | jbegin_count += reiserfs_xattr_jcreate_nblocks(inode); | |
592 | ||
593 | reiserfs_write_lock(inode->i_sb); | |
594 | error = journal_begin(&th, inode->i_sb, jbegin_count); | |
4c05141d | 595 | reiserfs_write_unlock(inode->i_sb); |
0ab2621e | 596 | if (error) { |
0ab2621e | 597 | return error; |
1da177e4 | 598 | } |
bd4c625c | 599 | |
0ab2621e JM |
600 | error = reiserfs_xattr_set_handle(&th, inode, name, |
601 | buffer, buffer_size, flags); | |
bd4c625c | 602 | |
4c05141d | 603 | reiserfs_write_lock(inode->i_sb); |
0ab2621e | 604 | error2 = journal_end(&th, inode->i_sb, jbegin_count); |
4c05141d | 605 | reiserfs_write_unlock(inode->i_sb); |
0ab2621e JM |
606 | if (error == 0) |
607 | error = error2; | |
0ab2621e JM |
608 | |
609 | return error; | |
1da177e4 LT |
610 | } |
611 | ||
612 | /* | |
1b1dcc1b | 613 | * inode->i_mutex: down |
1da177e4 LT |
614 | */ |
615 | int | |
48b32a35 | 616 | reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, |
bd4c625c | 617 | size_t buffer_size) |
1da177e4 | 618 | { |
bd4c625c | 619 | ssize_t err = 0; |
3227e14c | 620 | struct dentry *dentry; |
bd4c625c LT |
621 | size_t isize; |
622 | size_t file_pos = 0; | |
623 | size_t buffer_pos = 0; | |
624 | struct page *page; | |
bd4c625c LT |
625 | __u32 hash = 0; |
626 | ||
627 | if (name == NULL) | |
628 | return -EINVAL; | |
629 | ||
098297b2 JM |
630 | /* |
631 | * We can't have xattrs attached to v1 items since they don't have | |
632 | * generation numbers | |
633 | */ | |
bd4c625c LT |
634 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
635 | return -EOPNOTSUPP; | |
636 | ||
48b32a35 | 637 | dentry = xattr_lookup(inode, name, XATTR_REPLACE); |
3227e14c JM |
638 | if (IS_ERR(dentry)) { |
639 | err = PTR_ERR(dentry); | |
bd4c625c LT |
640 | goto out; |
641 | } | |
642 | ||
8b6dd72a | 643 | down_read(&REISERFS_I(inode)->i_xattr_sem); |
d984561b | 644 | |
f437c529 | 645 | isize = i_size_read(dentry->d_inode); |
bd4c625c LT |
646 | |
647 | /* Just return the size needed */ | |
648 | if (buffer == NULL) { | |
649 | err = isize - sizeof(struct reiserfs_xattr_header); | |
8b6dd72a | 650 | goto out_unlock; |
bd4c625c LT |
651 | } |
652 | ||
653 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { | |
654 | err = -ERANGE; | |
8b6dd72a | 655 | goto out_unlock; |
bd4c625c LT |
656 | } |
657 | ||
658 | while (file_pos < isize) { | |
659 | size_t chunk; | |
660 | char *data; | |
661 | size_t skip = 0; | |
662 | if (isize - file_pos > PAGE_CACHE_SIZE) | |
663 | chunk = PAGE_CACHE_SIZE; | |
664 | else | |
665 | chunk = isize - file_pos; | |
666 | ||
a72bdb1c | 667 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c LT |
668 | if (IS_ERR(page)) { |
669 | err = PTR_ERR(page); | |
8b6dd72a | 670 | goto out_unlock; |
bd4c625c LT |
671 | } |
672 | ||
673 | lock_page(page); | |
674 | data = page_address(page); | |
675 | if (file_pos == 0) { | |
676 | struct reiserfs_xattr_header *rxh = | |
677 | (struct reiserfs_xattr_header *)data; | |
678 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
679 | chunk -= skip; | |
680 | /* Magic doesn't match up.. */ | |
681 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { | |
682 | unlock_page(page); | |
683 | reiserfs_put_page(page); | |
a72bdb1c | 684 | reiserfs_warning(inode->i_sb, "jdm-20001", |
bd4c625c LT |
685 | "Invalid magic for xattr (%s) " |
686 | "associated with %k", name, | |
687 | INODE_PKEY(inode)); | |
688 | err = -EIO; | |
8b6dd72a | 689 | goto out_unlock; |
bd4c625c LT |
690 | } |
691 | hash = le32_to_cpu(rxh->h_hash); | |
692 | } | |
693 | memcpy(buffer + buffer_pos, data + skip, chunk); | |
694 | unlock_page(page); | |
695 | reiserfs_put_page(page); | |
696 | file_pos += chunk; | |
697 | buffer_pos += chunk; | |
698 | skip = 0; | |
699 | } | |
700 | err = isize - sizeof(struct reiserfs_xattr_header); | |
701 | ||
702 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != | |
703 | hash) { | |
a72bdb1c | 704 | reiserfs_warning(inode->i_sb, "jdm-20002", |
bd4c625c LT |
705 | "Invalid hash for xattr (%s) associated " |
706 | "with %k", name, INODE_PKEY(inode)); | |
707 | err = -EIO; | |
708 | } | |
709 | ||
8b6dd72a JM |
710 | out_unlock: |
711 | up_read(&REISERFS_I(inode)->i_xattr_sem); | |
3227e14c | 712 | dput(dentry); |
bd4c625c | 713 | |
a72bdb1c | 714 | out: |
bd4c625c | 715 | return err; |
1da177e4 LT |
716 | } |
717 | ||
48b32a35 JM |
718 | /* |
719 | * In order to implement different sets of xattr operations for each xattr | |
720 | * prefix with the generic xattr API, a filesystem should create a | |
721 | * null-terminated array of struct xattr_handler (one for each prefix) and | |
722 | * hang a pointer to it off of the s_xattr field of the superblock. | |
723 | * | |
724 | * The generic_fooxattr() functions will use this list to dispatch xattr | |
725 | * operations to the correct xattr_handler. | |
726 | */ | |
727 | #define for_each_xattr_handler(handlers, handler) \ | |
728 | for ((handler) = *(handlers)++; \ | |
729 | (handler) != NULL; \ | |
730 | (handler) = *(handlers)++) | |
1da177e4 | 731 | |
48b32a35 | 732 | /* This is the implementation for the xattr plugin infrastructure */ |
94d09a98 SH |
733 | static inline const struct xattr_handler * |
734 | find_xattr_handler_prefix(const struct xattr_handler **handlers, | |
48b32a35 | 735 | const char *name) |
1da177e4 | 736 | { |
94d09a98 | 737 | const struct xattr_handler *xah; |
bd4c625c | 738 | |
48b32a35 JM |
739 | if (!handlers) |
740 | return NULL; | |
bd4c625c | 741 | |
48b32a35 JM |
742 | for_each_xattr_handler(handlers, xah) { |
743 | if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0) | |
744 | break; | |
bd4c625c LT |
745 | } |
746 | ||
48b32a35 | 747 | return xah; |
bd4c625c | 748 | } |
1da177e4 | 749 | |
1da177e4 LT |
750 | |
751 | /* | |
752 | * Inode operation getxattr() | |
1da177e4 LT |
753 | */ |
754 | ssize_t | |
bd4c625c LT |
755 | reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, |
756 | size_t size) | |
1da177e4 | 757 | { |
94d09a98 | 758 | const struct xattr_handler *handler; |
bd4c625c | 759 | |
431547b3 | 760 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 761 | |
431547b3 | 762 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c LT |
763 | return -EOPNOTSUPP; |
764 | ||
431547b3 | 765 | return handler->get(dentry, name, buffer, size, handler->flags); |
1da177e4 LT |
766 | } |
767 | ||
1da177e4 LT |
768 | /* |
769 | * Inode operation setxattr() | |
770 | * | |
1b1dcc1b | 771 | * dentry->d_inode->i_mutex down |
1da177e4 LT |
772 | */ |
773 | int | |
bd4c625c LT |
774 | reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
775 | size_t size, int flags) | |
1da177e4 | 776 | { |
94d09a98 | 777 | const struct xattr_handler *handler; |
bd4c625c | 778 | |
431547b3 | 779 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 780 | |
431547b3 | 781 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c LT |
782 | return -EOPNOTSUPP; |
783 | ||
431547b3 | 784 | return handler->set(dentry, name, value, size, flags, handler->flags); |
1da177e4 LT |
785 | } |
786 | ||
787 | /* | |
788 | * Inode operation removexattr() | |
789 | * | |
1b1dcc1b | 790 | * dentry->d_inode->i_mutex down |
1da177e4 | 791 | */ |
bd4c625c | 792 | int reiserfs_removexattr(struct dentry *dentry, const char *name) |
1da177e4 | 793 | { |
94d09a98 | 794 | const struct xattr_handler *handler; |
431547b3 | 795 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
1da177e4 | 796 | |
431547b3 | 797 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c | 798 | return -EOPNOTSUPP; |
1da177e4 | 799 | |
431547b3 | 800 | return handler->set(dentry, name, NULL, 0, XATTR_REPLACE, handler->flags); |
1da177e4 LT |
801 | } |
802 | ||
48b32a35 | 803 | struct listxattr_buf { |
4acf381e | 804 | struct dir_context ctx; |
48b32a35 JM |
805 | size_t size; |
806 | size_t pos; | |
807 | char *buf; | |
431547b3 | 808 | struct dentry *dentry; |
1da177e4 LT |
809 | }; |
810 | ||
48b32a35 JM |
811 | static int listxattr_filler(void *buf, const char *name, int namelen, |
812 | loff_t offset, u64 ino, unsigned int d_type) | |
1da177e4 | 813 | { |
48b32a35 JM |
814 | struct listxattr_buf *b = (struct listxattr_buf *)buf; |
815 | size_t size; | |
816 | if (name[0] != '.' || | |
817 | (namelen != 1 && (name[1] != '.' || namelen != 2))) { | |
94d09a98 | 818 | const struct xattr_handler *handler; |
431547b3 | 819 | handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr, |
48b32a35 JM |
820 | name); |
821 | if (!handler) /* Unsupported xattr name */ | |
822 | return 0; | |
823 | if (b->buf) { | |
431547b3 CH |
824 | size = handler->list(b->dentry, b->buf + b->pos, |
825 | b->size, name, namelen, | |
826 | handler->flags); | |
48b32a35 JM |
827 | if (size > b->size) |
828 | return -ERANGE; | |
829 | } else { | |
431547b3 CH |
830 | size = handler->list(b->dentry, NULL, 0, name, |
831 | namelen, handler->flags); | |
bd4c625c | 832 | } |
bd4c625c | 833 | |
48b32a35 JM |
834 | b->pos += size; |
835 | } | |
bd4c625c | 836 | return 0; |
1da177e4 | 837 | } |
bd4c625c | 838 | |
1da177e4 LT |
839 | /* |
840 | * Inode operation listxattr() | |
841 | * | |
48b32a35 JM |
842 | * We totally ignore the generic listxattr here because it would be stupid |
843 | * not to. Since the xattrs are organized in a directory, we can just | |
844 | * readdir to find them. | |
1da177e4 | 845 | */ |
bd4c625c | 846 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
1da177e4 | 847 | { |
bd4c625c LT |
848 | struct dentry *dir; |
849 | int err = 0; | |
48b32a35 | 850 | struct listxattr_buf buf = { |
4acf381e | 851 | .ctx.actor = listxattr_filler, |
431547b3 | 852 | .dentry = dentry, |
48b32a35 JM |
853 | .buf = buffer, |
854 | .size = buffer ? size : 0, | |
855 | }; | |
bd4c625c LT |
856 | |
857 | if (!dentry->d_inode) | |
858 | return -EINVAL; | |
859 | ||
677c9b2e | 860 | if (!dentry->d_sb->s_xattr || |
bd4c625c LT |
861 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
862 | return -EOPNOTSUPP; | |
863 | ||
6c17675e | 864 | dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE); |
bd4c625c LT |
865 | if (IS_ERR(dir)) { |
866 | err = PTR_ERR(dir); | |
867 | if (err == -ENODATA) | |
48b32a35 | 868 | err = 0; /* Not an error if there aren't any xattrs */ |
bd4c625c LT |
869 | goto out; |
870 | } | |
871 | ||
6c17675e | 872 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
cd62cdae | 873 | err = reiserfs_readdir_inode(dir->d_inode, &buf.ctx); |
6c17675e | 874 | mutex_unlock(&dir->d_inode->i_mutex); |
bd4c625c | 875 | |
48b32a35 JM |
876 | if (!err) |
877 | err = buf.pos; | |
bd4c625c | 878 | |
3227e14c | 879 | dput(dir); |
8b6dd72a | 880 | out: |
bd4c625c | 881 | return err; |
1da177e4 LT |
882 | } |
883 | ||
a72bdb1c | 884 | static int create_privroot(struct dentry *dentry) |
1da177e4 | 885 | { |
a72bdb1c JM |
886 | int err; |
887 | struct inode *inode = dentry->d_parent->d_inode; | |
5a6059c3 JM |
888 | WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex)); |
889 | ||
6c17675e | 890 | err = xattr_mkdir(inode, dentry, 0700); |
edcc37a0 AV |
891 | if (err || !dentry->d_inode) { |
892 | reiserfs_warning(dentry->d_sb, "jdm-20006", | |
893 | "xattrs/ACLs enabled and couldn't " | |
894 | "find/create .reiserfs_priv. " | |
895 | "Failing mount."); | |
896 | return -EOPNOTSUPP; | |
bd4c625c LT |
897 | } |
898 | ||
edcc37a0 AV |
899 | dentry->d_inode->i_flags |= S_PRIVATE; |
900 | reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr " | |
901 | "storage.\n", PRIVROOT_NAME); | |
bd4c625c | 902 | |
edcc37a0 | 903 | return 0; |
1da177e4 LT |
904 | } |
905 | ||
12abb35a JM |
906 | #else |
907 | int __init reiserfs_xattr_register_handlers(void) { return 0; } | |
908 | void reiserfs_xattr_unregister_handlers(void) {} | |
909 | static int create_privroot(struct dentry *dentry) { return 0; } | |
910 | #endif | |
911 | ||
912 | /* Actual operations that are exported to VFS-land */ | |
da02eb72 | 913 | static const struct xattr_handler *reiserfs_xattr_handlers[] = { |
12abb35a JM |
914 | #ifdef CONFIG_REISERFS_FS_XATTR |
915 | &reiserfs_xattr_user_handler, | |
916 | &reiserfs_xattr_trusted_handler, | |
917 | #endif | |
918 | #ifdef CONFIG_REISERFS_FS_SECURITY | |
919 | &reiserfs_xattr_security_handler, | |
920 | #endif | |
921 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL | |
47f70d08 CH |
922 | &posix_acl_access_xattr_handler, |
923 | &posix_acl_default_xattr_handler, | |
12abb35a JM |
924 | #endif |
925 | NULL | |
926 | }; | |
927 | ||
a72bdb1c | 928 | static int xattr_mount_check(struct super_block *s) |
1da177e4 | 929 | { |
098297b2 JM |
930 | /* |
931 | * We need generation numbers to ensure that the oid mapping is correct | |
932 | * v3.5 filesystems don't have them. | |
933 | */ | |
48b32a35 JM |
934 | if (old_format_only(s)) { |
935 | if (reiserfs_xattrs_optional(s)) { | |
098297b2 JM |
936 | /* |
937 | * Old format filesystem, but optional xattrs have | |
938 | * been enabled. Error out. | |
939 | */ | |
48b32a35 JM |
940 | reiserfs_warning(s, "jdm-2005", |
941 | "xattrs/ACLs not supported " | |
942 | "on pre-v3.6 format filesystems. " | |
943 | "Failing mount."); | |
944 | return -EOPNOTSUPP; | |
945 | } | |
a72bdb1c JM |
946 | } |
947 | ||
948 | return 0; | |
1da177e4 LT |
949 | } |
950 | ||
10556cb2 | 951 | int reiserfs_permission(struct inode *inode, int mask) |
b83674c0 JM |
952 | { |
953 | /* | |
954 | * We don't do permission checks on the internal objects. | |
955 | * Permissions are determined by the "owning" object. | |
956 | */ | |
957 | if (IS_PRIVATE(inode)) | |
958 | return 0; | |
959 | ||
2830ba7f | 960 | return generic_permission(inode, mask); |
b83674c0 JM |
961 | } |
962 | ||
0b728e19 | 963 | static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 964 | { |
cac36f70 | 965 | return -EPERM; |
1da177e4 LT |
966 | } |
967 | ||
e16404ed | 968 | static const struct dentry_operations xattr_lookup_poison_ops = { |
cac36f70 | 969 | .d_revalidate = xattr_hide_revalidate, |
1da177e4 LT |
970 | }; |
971 | ||
edcc37a0 AV |
972 | int reiserfs_lookup_privroot(struct super_block *s) |
973 | { | |
974 | struct dentry *dentry; | |
975 | int err = 0; | |
976 | ||
977 | /* If we don't have the privroot located yet - go find it */ | |
4c05141d | 978 | mutex_lock(&s->s_root->d_inode->i_mutex); |
edcc37a0 AV |
979 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, |
980 | strlen(PRIVROOT_NAME)); | |
981 | if (!IS_ERR(dentry)) { | |
982 | REISERFS_SB(s)->priv_root = dentry; | |
fb045adb | 983 | d_set_d_op(dentry, &xattr_lookup_poison_ops); |
edcc37a0 AV |
984 | if (dentry->d_inode) |
985 | dentry->d_inode->i_flags |= S_PRIVATE; | |
986 | } else | |
987 | err = PTR_ERR(dentry); | |
988 | mutex_unlock(&s->s_root->d_inode->i_mutex); | |
989 | ||
990 | return err; | |
991 | } | |
992 | ||
098297b2 JM |
993 | /* |
994 | * We need to take a copy of the mount flags since things like | |
1da177e4 | 995 | * MS_RDONLY don't get set until *after* we're called. |
098297b2 JM |
996 | * mount_flags != mount_options |
997 | */ | |
bd4c625c | 998 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
1da177e4 | 999 | { |
bd4c625c | 1000 | int err = 0; |
ab17c4f0 | 1001 | struct dentry *privroot = REISERFS_SB(s)->priv_root; |
bd4c625c | 1002 | |
a72bdb1c JM |
1003 | err = xattr_mount_check(s); |
1004 | if (err) | |
bd4c625c | 1005 | goto error; |
bd4c625c | 1006 | |
ab17c4f0 | 1007 | if (!privroot->d_inode && !(mount_flags & MS_RDONLY)) { |
4c05141d | 1008 | mutex_lock(&s->s_root->d_inode->i_mutex); |
edcc37a0 | 1009 | err = create_privroot(REISERFS_SB(s)->priv_root); |
5a6059c3 | 1010 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
bd4c625c | 1011 | } |
ab17c4f0 JM |
1012 | |
1013 | if (privroot->d_inode) { | |
48b32a35 | 1014 | s->s_xattr = reiserfs_xattr_handlers; |
4c05141d | 1015 | mutex_lock(&privroot->d_inode->i_mutex); |
ab17c4f0 JM |
1016 | if (!REISERFS_SB(s)->xattr_root) { |
1017 | struct dentry *dentry; | |
1018 | dentry = lookup_one_len(XAROOT_NAME, privroot, | |
1019 | strlen(XAROOT_NAME)); | |
1020 | if (!IS_ERR(dentry)) | |
1021 | REISERFS_SB(s)->xattr_root = dentry; | |
1022 | else | |
1023 | err = PTR_ERR(dentry); | |
1024 | } | |
1025 | mutex_unlock(&privroot->d_inode->i_mutex); | |
1026 | } | |
48b32a35 | 1027 | |
a72bdb1c | 1028 | error: |
bd4c625c | 1029 | if (err) { |
bd4c625c LT |
1030 | clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt)); |
1031 | clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt)); | |
1032 | } | |
1033 | ||
1034 | /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */ | |
bd4c625c LT |
1035 | if (reiserfs_posixacl(s)) |
1036 | s->s_flags |= MS_POSIXACL; | |
ab17c4f0 | 1037 | else |
ab17c4f0 | 1038 | s->s_flags &= ~MS_POSIXACL; |
bd4c625c LT |
1039 | |
1040 | return err; | |
1da177e4 | 1041 | } |