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" |
17093991 | 48 | #include <linux/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; | |
f3fb9e27 | 87 | |
6c17675e | 88 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
bd4c625c | 89 | |
2b0143b5 | 90 | mutex_lock_nested(&d_inode(dentry)->i_mutex, I_MUTEX_CHILD); |
6c17675e | 91 | error = dir->i_op->unlink(dir, dentry); |
2b0143b5 | 92 | mutex_unlock(&d_inode(dentry)->i_mutex); |
6c17675e JM |
93 | |
94 | if (!error) | |
95 | d_delete(dentry); | |
96 | return error; | |
97 | } | |
98 | ||
99 | static int xattr_rmdir(struct inode *dir, struct dentry *dentry) | |
100 | { | |
101 | int error; | |
f3fb9e27 | 102 | |
6c17675e | 103 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
6c17675e | 104 | |
2b0143b5 | 105 | mutex_lock_nested(&d_inode(dentry)->i_mutex, I_MUTEX_CHILD); |
6c17675e JM |
106 | error = dir->i_op->rmdir(dir, dentry); |
107 | if (!error) | |
2b0143b5 DH |
108 | d_inode(dentry)->i_flags |= S_DEAD; |
109 | mutex_unlock(&d_inode(dentry)->i_mutex); | |
6c17675e JM |
110 | if (!error) |
111 | d_delete(dentry); | |
6c17675e JM |
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; | |
f3fb9e27 | 122 | |
2b0143b5 | 123 | if (d_really_is_negative(privroot)) |
ab17c4f0 | 124 | return ERR_PTR(-ENODATA); |
6c17675e | 125 | |
2b0143b5 | 126 | mutex_lock_nested(&d_inode(privroot)->i_mutex, I_MUTEX_XATTR); |
6c17675e | 127 | |
ab17c4f0 | 128 | xaroot = dget(REISERFS_SB(sb)->xattr_root); |
ceb5edc4 JM |
129 | if (!xaroot) |
130 | xaroot = ERR_PTR(-ENODATA); | |
2b0143b5 | 131 | else if (d_really_is_negative(xaroot)) { |
ab17c4f0 | 132 | int err = -ENODATA; |
f3fb9e27 | 133 | |
5a6059c3 | 134 | if (xattr_may_create(flags)) |
2b0143b5 | 135 | err = xattr_mkdir(d_inode(privroot), xaroot, 0700); |
9b7f3755 | 136 | if (err) { |
ab17c4f0 JM |
137 | dput(xaroot); |
138 | xaroot = ERR_PTR(err); | |
9b7f3755 | 139 | } |
bd4c625c | 140 | } |
6c17675e | 141 | |
2b0143b5 | 142 | mutex_unlock(&d_inode(privroot)->i_mutex); |
ab17c4f0 | 143 | return xaroot; |
1da177e4 LT |
144 | } |
145 | ||
bd4c625c | 146 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
1da177e4 | 147 | { |
bd4c625c LT |
148 | struct dentry *xaroot, *xadir; |
149 | char namebuf[17]; | |
150 | ||
6c17675e | 151 | xaroot = open_xa_root(inode->i_sb, flags); |
9b7f3755 | 152 | if (IS_ERR(xaroot)) |
bd4c625c | 153 | return xaroot; |
bd4c625c | 154 | |
bd4c625c LT |
155 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
156 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), | |
157 | inode->i_generation); | |
bd4c625c | 158 | |
2b0143b5 | 159 | mutex_lock_nested(&d_inode(xaroot)->i_mutex, I_MUTEX_XATTR); |
ab17c4f0 JM |
160 | |
161 | xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf)); | |
2b0143b5 | 162 | if (!IS_ERR(xadir) && d_really_is_negative(xadir)) { |
ab17c4f0 | 163 | int err = -ENODATA; |
f3fb9e27 | 164 | |
ab17c4f0 | 165 | if (xattr_may_create(flags)) |
2b0143b5 | 166 | err = xattr_mkdir(d_inode(xaroot), xadir, 0700); |
ab17c4f0 JM |
167 | if (err) { |
168 | dput(xadir); | |
169 | xadir = ERR_PTR(err); | |
170 | } | |
171 | } | |
172 | ||
2b0143b5 | 173 | mutex_unlock(&d_inode(xaroot)->i_mutex); |
bd4c625c LT |
174 | dput(xaroot); |
175 | return xadir; | |
1da177e4 LT |
176 | } |
177 | ||
098297b2 JM |
178 | /* |
179 | * The following are side effects of other operations that aren't explicitly | |
48b32a35 | 180 | * modifying extended attributes. This includes operations such as permissions |
098297b2 JM |
181 | * or ownership changes, object deletions, etc. |
182 | */ | |
a41f1a47 | 183 | struct reiserfs_dentry_buf { |
4acf381e | 184 | struct dir_context ctx; |
a41f1a47 JM |
185 | struct dentry *xadir; |
186 | int count; | |
187 | struct dentry *dentries[8]; | |
188 | }; | |
bd4c625c | 189 | |
a72bdb1c | 190 | static int |
ac7576f4 MS |
191 | fill_with_dentries(struct dir_context *ctx, const char *name, int namelen, |
192 | loff_t offset, u64 ino, unsigned int d_type) | |
a72bdb1c | 193 | { |
ac7576f4 MS |
194 | struct reiserfs_dentry_buf *dbuf = |
195 | container_of(ctx, struct reiserfs_dentry_buf, ctx); | |
a72bdb1c | 196 | struct dentry *dentry; |
f3fb9e27 | 197 | |
2b0143b5 | 198 | WARN_ON_ONCE(!mutex_is_locked(&d_inode(dbuf->xadir)->i_mutex)); |
bd4c625c | 199 | |
a41f1a47 JM |
200 | if (dbuf->count == ARRAY_SIZE(dbuf->dentries)) |
201 | return -ENOSPC; | |
bd4c625c | 202 | |
35e5cbc0 JK |
203 | if (name[0] == '.' && (namelen < 2 || |
204 | (namelen == 2 && name[1] == '.'))) | |
a41f1a47 | 205 | return 0; |
bd4c625c | 206 | |
a41f1a47 | 207 | dentry = lookup_one_len(name, dbuf->xadir, namelen); |
a72bdb1c | 208 | if (IS_ERR(dentry)) { |
a41f1a47 | 209 | return PTR_ERR(dentry); |
2b0143b5 | 210 | } else if (d_really_is_negative(dentry)) { |
a41f1a47 JM |
211 | /* A directory entry exists, but no file? */ |
212 | reiserfs_error(dentry->d_sb, "xattr-20003", | |
a455589f AV |
213 | "Corrupted directory: xattr %pd listed but " |
214 | "not found for file %pd.\n", | |
215 | dentry, dbuf->xadir); | |
a41f1a47 JM |
216 | dput(dentry); |
217 | return -EIO; | |
bd4c625c | 218 | } |
1da177e4 | 219 | |
a41f1a47 JM |
220 | dbuf->dentries[dbuf->count++] = dentry; |
221 | return 0; | |
1da177e4 LT |
222 | } |
223 | ||
a41f1a47 JM |
224 | static void |
225 | cleanup_dentry_buf(struct reiserfs_dentry_buf *buf) | |
1da177e4 | 226 | { |
a41f1a47 | 227 | int i; |
f3fb9e27 | 228 | |
a41f1a47 JM |
229 | for (i = 0; i < buf->count; i++) |
230 | if (buf->dentries[i]) | |
231 | dput(buf->dentries[i]); | |
a72bdb1c JM |
232 | } |
233 | ||
a41f1a47 JM |
234 | static int reiserfs_for_each_xattr(struct inode *inode, |
235 | int (*action)(struct dentry *, void *), | |
236 | void *data) | |
a72bdb1c | 237 | { |
a41f1a47 JM |
238 | struct dentry *dir; |
239 | int i, err = 0; | |
a41f1a47 | 240 | struct reiserfs_dentry_buf buf = { |
4acf381e | 241 | .ctx.actor = fill_with_dentries, |
a41f1a47 | 242 | }; |
1da177e4 | 243 | |
a72bdb1c JM |
244 | /* Skip out, an xattr has no xattrs associated with it */ |
245 | if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1) | |
246 | return 0; | |
1da177e4 | 247 | |
6c17675e | 248 | dir = open_xa_dir(inode, XATTR_REPLACE); |
a72bdb1c JM |
249 | if (IS_ERR(dir)) { |
250 | err = PTR_ERR(dir); | |
251 | goto out; | |
2b0143b5 | 252 | } else if (d_really_is_negative(dir)) { |
a41f1a47 JM |
253 | err = 0; |
254 | goto out_dir; | |
a72bdb1c | 255 | } |
1da177e4 | 256 | |
2b0143b5 | 257 | mutex_lock_nested(&d_inode(dir)->i_mutex, I_MUTEX_XATTR); |
27026a05 | 258 | |
a41f1a47 | 259 | buf.xadir = dir; |
cd62cdae | 260 | while (1) { |
2b0143b5 | 261 | err = reiserfs_readdir_inode(d_inode(dir), &buf.ctx); |
cd62cdae AV |
262 | if (err) |
263 | break; | |
264 | if (!buf.count) | |
265 | break; | |
266 | for (i = 0; !err && i < buf.count && buf.dentries[i]; i++) { | |
a41f1a47 | 267 | struct dentry *dentry = buf.dentries[i]; |
1da177e4 | 268 | |
e36cb0b8 | 269 | if (!d_is_dir(dentry)) |
cd62cdae | 270 | err = action(dentry, data); |
1da177e4 | 271 | |
a41f1a47 JM |
272 | dput(dentry); |
273 | buf.dentries[i] = NULL; | |
bd4c625c | 274 | } |
cd62cdae AV |
275 | if (err) |
276 | break; | |
a41f1a47 | 277 | buf.count = 0; |
8b6dd72a | 278 | } |
2b0143b5 | 279 | mutex_unlock(&d_inode(dir)->i_mutex); |
1da177e4 | 280 | |
a41f1a47 | 281 | cleanup_dentry_buf(&buf); |
1da177e4 | 282 | |
d984561b | 283 | if (!err) { |
098297b2 JM |
284 | /* |
285 | * We start a transaction here to avoid a ABBA situation | |
a41f1a47 JM |
286 | * between the xattr root's i_mutex and the journal lock. |
287 | * This doesn't incur much additional overhead since the | |
288 | * new transaction will just nest inside the | |
098297b2 JM |
289 | * outer transaction. |
290 | */ | |
a41f1a47 JM |
291 | int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + |
292 | 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); | |
293 | struct reiserfs_transaction_handle th; | |
f3fb9e27 | 294 | |
4c05141d | 295 | reiserfs_write_lock(inode->i_sb); |
a41f1a47 | 296 | err = journal_begin(&th, inode->i_sb, blocks); |
4c05141d | 297 | reiserfs_write_unlock(inode->i_sb); |
a41f1a47 JM |
298 | if (!err) { |
299 | int jerror; | |
f3fb9e27 | 300 | |
2b0143b5 | 301 | mutex_lock_nested(&d_inode(dir->d_parent)->i_mutex, |
4c05141d | 302 | I_MUTEX_XATTR); |
a41f1a47 | 303 | err = action(dir, data); |
4c05141d | 304 | reiserfs_write_lock(inode->i_sb); |
58d85426 | 305 | jerror = journal_end(&th); |
4c05141d | 306 | reiserfs_write_unlock(inode->i_sb); |
2b0143b5 | 307 | mutex_unlock(&d_inode(dir->d_parent)->i_mutex); |
a41f1a47 JM |
308 | err = jerror ?: err; |
309 | } | |
a72bdb1c | 310 | } |
a41f1a47 JM |
311 | out_dir: |
312 | dput(dir); | |
a72bdb1c | 313 | out: |
a41f1a47 JM |
314 | /* -ENODATA isn't an error */ |
315 | if (err == -ENODATA) | |
316 | err = 0; | |
a72bdb1c JM |
317 | return err; |
318 | } | |
1da177e4 | 319 | |
a41f1a47 | 320 | static int delete_one_xattr(struct dentry *dentry, void *data) |
a72bdb1c | 321 | { |
2b0143b5 | 322 | struct inode *dir = d_inode(dentry->d_parent); |
1da177e4 | 323 | |
a41f1a47 | 324 | /* This is the xattr dir, handle specially. */ |
e36cb0b8 | 325 | if (d_is_dir(dentry)) |
a41f1a47 | 326 | return xattr_rmdir(dir, dentry); |
1da177e4 | 327 | |
a41f1a47 JM |
328 | return xattr_unlink(dir, dentry); |
329 | } | |
bd4c625c | 330 | |
a41f1a47 JM |
331 | static int chown_one_xattr(struct dentry *dentry, void *data) |
332 | { | |
333 | struct iattr *attrs = data; | |
4a857011 JM |
334 | int ia_valid = attrs->ia_valid; |
335 | int err; | |
336 | ||
337 | /* | |
338 | * We only want the ownership bits. Otherwise, we'll do | |
339 | * things like change a directory to a regular file if | |
340 | * ATTR_MODE is set. | |
341 | */ | |
342 | attrs->ia_valid &= (ATTR_UID|ATTR_GID); | |
343 | err = reiserfs_setattr(dentry, attrs); | |
344 | attrs->ia_valid = ia_valid; | |
345 | ||
346 | return err; | |
a41f1a47 | 347 | } |
1da177e4 | 348 | |
a41f1a47 JM |
349 | /* No i_mutex, but the inode is unconnected. */ |
350 | int reiserfs_delete_xattrs(struct inode *inode) | |
351 | { | |
352 | int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); | |
f3fb9e27 | 353 | |
a41f1a47 JM |
354 | if (err) |
355 | reiserfs_warning(inode->i_sb, "jdm-20004", | |
356 | "Couldn't delete all xattrs (%d)\n", err); | |
a72bdb1c JM |
357 | return err; |
358 | } | |
1da177e4 | 359 | |
a41f1a47 | 360 | /* inode->i_mutex: down */ |
a72bdb1c JM |
361 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
362 | { | |
a41f1a47 | 363 | int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); |
f3fb9e27 | 364 | |
8b6dd72a JM |
365 | if (err) |
366 | reiserfs_warning(inode->i_sb, "jdm-20007", | |
367 | "Couldn't chown all xattrs (%d)\n", err); | |
a72bdb1c | 368 | return err; |
1da177e4 LT |
369 | } |
370 | ||
a72bdb1c | 371 | #ifdef CONFIG_REISERFS_FS_XATTR |
098297b2 JM |
372 | /* |
373 | * Returns a dentry corresponding to a specific extended attribute file | |
a72bdb1c | 374 | * for the inode. If flags allow, the file is created. Otherwise, a |
098297b2 JM |
375 | * valid or negative dentry, or an error is returned. |
376 | */ | |
48b32a35 JM |
377 | static struct dentry *xattr_lookup(struct inode *inode, const char *name, |
378 | int flags) | |
1da177e4 | 379 | { |
a72bdb1c JM |
380 | struct dentry *xadir, *xafile; |
381 | int err = 0; | |
382 | ||
383 | xadir = open_xa_dir(inode, flags); | |
6c17675e | 384 | if (IS_ERR(xadir)) |
a72bdb1c | 385 | return ERR_CAST(xadir); |
a72bdb1c | 386 | |
2b0143b5 | 387 | mutex_lock_nested(&d_inode(xadir)->i_mutex, I_MUTEX_XATTR); |
a72bdb1c JM |
388 | xafile = lookup_one_len(name, xadir, strlen(name)); |
389 | if (IS_ERR(xafile)) { | |
6c17675e JM |
390 | err = PTR_ERR(xafile); |
391 | goto out; | |
bd4c625c | 392 | } |
a72bdb1c | 393 | |
2b0143b5 | 394 | if (d_really_is_positive(xafile) && (flags & XATTR_CREATE)) |
6c17675e | 395 | err = -EEXIST; |
a72bdb1c | 396 | |
2b0143b5 | 397 | if (d_really_is_negative(xafile)) { |
6c17675e | 398 | err = -ENODATA; |
5a6059c3 | 399 | if (xattr_may_create(flags)) |
2b0143b5 | 400 | err = xattr_create(d_inode(xadir), xafile, |
6c17675e | 401 | 0700|S_IFREG); |
a72bdb1c JM |
402 | } |
403 | ||
6c17675e JM |
404 | if (err) |
405 | dput(xafile); | |
a72bdb1c | 406 | out: |
2b0143b5 | 407 | mutex_unlock(&d_inode(xadir)->i_mutex); |
a72bdb1c JM |
408 | dput(xadir); |
409 | if (err) | |
6c17675e | 410 | return ERR_PTR(err); |
a72bdb1c | 411 | return xafile; |
1da177e4 LT |
412 | } |
413 | ||
1da177e4 | 414 | /* Internal operations on file data */ |
bd4c625c | 415 | static inline void reiserfs_put_page(struct page *page) |
1da177e4 | 416 | { |
bd4c625c LT |
417 | kunmap(page); |
418 | page_cache_release(page); | |
1da177e4 LT |
419 | } |
420 | ||
ec6ea56b | 421 | static struct page *reiserfs_get_page(struct inode *dir, size_t n) |
1da177e4 | 422 | { |
bd4c625c LT |
423 | struct address_space *mapping = dir->i_mapping; |
424 | struct page *page; | |
098297b2 JM |
425 | /* |
426 | * We can deadlock if we try to free dentries, | |
427 | * and an unlink/rmdir has just occurred - GFP_NOFS avoids this | |
428 | */ | |
c4cdd038 | 429 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
ec6ea56b | 430 | page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL); |
bd4c625c | 431 | if (!IS_ERR(page)) { |
bd4c625c | 432 | kmap(page); |
bd4c625c LT |
433 | if (PageError(page)) |
434 | goto fail; | |
435 | } | |
436 | return page; | |
437 | ||
cf776a7a | 438 | fail: |
bd4c625c LT |
439 | reiserfs_put_page(page); |
440 | return ERR_PTR(-EIO); | |
1da177e4 LT |
441 | } |
442 | ||
bd4c625c | 443 | static inline __u32 xattr_hash(const char *msg, int len) |
1da177e4 | 444 | { |
bd4c625c | 445 | return csum_partial(msg, len, 0); |
1da177e4 LT |
446 | } |
447 | ||
ba9d8cec VS |
448 | int reiserfs_commit_write(struct file *f, struct page *page, |
449 | unsigned from, unsigned to); | |
ba9d8cec | 450 | |
48b32a35 JM |
451 | static void update_ctime(struct inode *inode) |
452 | { | |
453 | struct timespec now = current_fs_time(inode->i_sb); | |
f3fb9e27 | 454 | |
1d3382cb | 455 | if (inode_unhashed(inode) || !inode->i_nlink || |
48b32a35 JM |
456 | timespec_equal(&inode->i_ctime, &now)) |
457 | return; | |
458 | ||
459 | inode->i_ctime = CURRENT_TIME_SEC; | |
460 | mark_inode_dirty(inode); | |
461 | } | |
462 | ||
463 | static int lookup_and_delete_xattr(struct inode *inode, const char *name) | |
464 | { | |
465 | int err = 0; | |
466 | struct dentry *dentry, *xadir; | |
467 | ||
468 | xadir = open_xa_dir(inode, XATTR_REPLACE); | |
469 | if (IS_ERR(xadir)) | |
470 | return PTR_ERR(xadir); | |
471 | ||
2b0143b5 | 472 | mutex_lock_nested(&d_inode(xadir)->i_mutex, I_MUTEX_XATTR); |
48b32a35 JM |
473 | dentry = lookup_one_len(name, xadir, strlen(name)); |
474 | if (IS_ERR(dentry)) { | |
475 | err = PTR_ERR(dentry); | |
476 | goto out_dput; | |
477 | } | |
478 | ||
2b0143b5 DH |
479 | if (d_really_is_positive(dentry)) { |
480 | err = xattr_unlink(d_inode(xadir), dentry); | |
48b32a35 JM |
481 | update_ctime(inode); |
482 | } | |
483 | ||
484 | dput(dentry); | |
485 | out_dput: | |
2b0143b5 | 486 | mutex_unlock(&d_inode(xadir)->i_mutex); |
48b32a35 JM |
487 | dput(xadir); |
488 | return err; | |
489 | } | |
490 | ||
ba9d8cec | 491 | |
1da177e4 LT |
492 | /* Generic extended attribute operations that can be used by xa plugins */ |
493 | ||
494 | /* | |
1b1dcc1b | 495 | * inode->i_mutex: down |
1da177e4 LT |
496 | */ |
497 | int | |
0ab2621e JM |
498 | reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, |
499 | struct inode *inode, const char *name, | |
500 | const void *buffer, size_t buffer_size, int flags) | |
1da177e4 | 501 | { |
bd4c625c | 502 | int err = 0; |
3227e14c | 503 | struct dentry *dentry; |
bd4c625c LT |
504 | struct page *page; |
505 | char *data; | |
bd4c625c LT |
506 | size_t file_pos = 0; |
507 | size_t buffer_pos = 0; | |
48b32a35 | 508 | size_t new_size; |
bd4c625c LT |
509 | __u32 xahash = 0; |
510 | ||
bd4c625c LT |
511 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
512 | return -EOPNOTSUPP; | |
513 | ||
4f3be1b5 FW |
514 | if (!buffer) { |
515 | err = lookup_and_delete_xattr(inode, name); | |
4f3be1b5 FW |
516 | return err; |
517 | } | |
518 | ||
48b32a35 | 519 | dentry = xattr_lookup(inode, name, flags); |
4c05141d | 520 | if (IS_ERR(dentry)) |
48b32a35 | 521 | return PTR_ERR(dentry); |
3f14fea6 | 522 | |
f3e22f48 | 523 | down_write(&REISERFS_I(inode)->i_xattr_sem); |
bd4c625c | 524 | |
8b6dd72a | 525 | xahash = xattr_hash(buffer, buffer_size); |
bd4c625c LT |
526 | while (buffer_pos < buffer_size || buffer_pos == 0) { |
527 | size_t chunk; | |
528 | size_t skip = 0; | |
529 | size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1)); | |
f3fb9e27 | 530 | |
bd4c625c LT |
531 | if (buffer_size - buffer_pos > PAGE_CACHE_SIZE) |
532 | chunk = PAGE_CACHE_SIZE; | |
533 | else | |
534 | chunk = buffer_size - buffer_pos; | |
535 | ||
2b0143b5 | 536 | page = reiserfs_get_page(d_inode(dentry), file_pos); |
bd4c625c LT |
537 | if (IS_ERR(page)) { |
538 | err = PTR_ERR(page); | |
48b32a35 | 539 | goto out_unlock; |
bd4c625c LT |
540 | } |
541 | ||
542 | lock_page(page); | |
543 | data = page_address(page); | |
544 | ||
545 | if (file_pos == 0) { | |
546 | struct reiserfs_xattr_header *rxh; | |
f3fb9e27 | 547 | |
bd4c625c LT |
548 | skip = file_pos = sizeof(struct reiserfs_xattr_header); |
549 | if (chunk + skip > PAGE_CACHE_SIZE) | |
550 | chunk = PAGE_CACHE_SIZE - skip; | |
551 | rxh = (struct reiserfs_xattr_header *)data; | |
552 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); | |
553 | rxh->h_hash = cpu_to_le32(xahash); | |
554 | } | |
555 | ||
4c05141d | 556 | reiserfs_write_lock(inode->i_sb); |
ebdec241 | 557 | err = __reiserfs_write_begin(page, page_offset, chunk + skip); |
bd4c625c LT |
558 | if (!err) { |
559 | if (buffer) | |
560 | memcpy(data + skip, buffer + buffer_pos, chunk); | |
3227e14c JM |
561 | err = reiserfs_commit_write(NULL, page, page_offset, |
562 | page_offset + chunk + | |
563 | skip); | |
bd4c625c | 564 | } |
4c05141d | 565 | reiserfs_write_unlock(inode->i_sb); |
bd4c625c LT |
566 | unlock_page(page); |
567 | reiserfs_put_page(page); | |
568 | buffer_pos += chunk; | |
569 | file_pos += chunk; | |
570 | skip = 0; | |
571 | if (err || buffer_size == 0 || !buffer) | |
572 | break; | |
573 | } | |
574 | ||
48b32a35 | 575 | new_size = buffer_size + sizeof(struct reiserfs_xattr_header); |
2b0143b5 | 576 | if (!err && new_size < i_size_read(d_inode(dentry))) { |
48b32a35 JM |
577 | struct iattr newattrs = { |
578 | .ia_ctime = current_fs_time(inode->i_sb), | |
fb2162df | 579 | .ia_size = new_size, |
48b32a35 JM |
580 | .ia_valid = ATTR_SIZE | ATTR_CTIME, |
581 | }; | |
31370f62 | 582 | |
2b0143b5 DH |
583 | mutex_lock_nested(&d_inode(dentry)->i_mutex, I_MUTEX_XATTR); |
584 | inode_dio_wait(d_inode(dentry)); | |
31370f62 | 585 | |
48b32a35 | 586 | err = reiserfs_setattr(dentry, &newattrs); |
2b0143b5 | 587 | mutex_unlock(&d_inode(dentry)->i_mutex); |
48b32a35 JM |
588 | } else |
589 | update_ctime(inode); | |
590 | out_unlock: | |
8b6dd72a | 591 | up_write(&REISERFS_I(inode)->i_xattr_sem); |
3227e14c | 592 | dput(dentry); |
48b32a35 JM |
593 | return err; |
594 | } | |
bd4c625c | 595 | |
0ab2621e JM |
596 | /* We need to start a transaction to maintain lock ordering */ |
597 | int reiserfs_xattr_set(struct inode *inode, const char *name, | |
598 | const void *buffer, size_t buffer_size, int flags) | |
48b32a35 | 599 | { |
0ab2621e JM |
600 | |
601 | struct reiserfs_transaction_handle th; | |
602 | int error, error2; | |
603 | size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size); | |
604 | ||
605 | if (!(flags & XATTR_REPLACE)) | |
606 | jbegin_count += reiserfs_xattr_jcreate_nblocks(inode); | |
607 | ||
608 | reiserfs_write_lock(inode->i_sb); | |
609 | error = journal_begin(&th, inode->i_sb, jbegin_count); | |
4c05141d | 610 | reiserfs_write_unlock(inode->i_sb); |
0ab2621e | 611 | if (error) { |
0ab2621e | 612 | return error; |
1da177e4 | 613 | } |
bd4c625c | 614 | |
0ab2621e JM |
615 | error = reiserfs_xattr_set_handle(&th, inode, name, |
616 | buffer, buffer_size, flags); | |
bd4c625c | 617 | |
4c05141d | 618 | reiserfs_write_lock(inode->i_sb); |
58d85426 | 619 | error2 = journal_end(&th); |
4c05141d | 620 | reiserfs_write_unlock(inode->i_sb); |
0ab2621e JM |
621 | if (error == 0) |
622 | error = error2; | |
0ab2621e JM |
623 | |
624 | return error; | |
1da177e4 LT |
625 | } |
626 | ||
627 | /* | |
1b1dcc1b | 628 | * inode->i_mutex: down |
1da177e4 LT |
629 | */ |
630 | int | |
48b32a35 | 631 | reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, |
bd4c625c | 632 | size_t buffer_size) |
1da177e4 | 633 | { |
bd4c625c | 634 | ssize_t err = 0; |
3227e14c | 635 | struct dentry *dentry; |
bd4c625c LT |
636 | size_t isize; |
637 | size_t file_pos = 0; | |
638 | size_t buffer_pos = 0; | |
639 | struct page *page; | |
bd4c625c LT |
640 | __u32 hash = 0; |
641 | ||
642 | if (name == NULL) | |
643 | return -EINVAL; | |
644 | ||
098297b2 JM |
645 | /* |
646 | * We can't have xattrs attached to v1 items since they don't have | |
647 | * generation numbers | |
648 | */ | |
bd4c625c LT |
649 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
650 | return -EOPNOTSUPP; | |
651 | ||
48b32a35 | 652 | dentry = xattr_lookup(inode, name, XATTR_REPLACE); |
3227e14c JM |
653 | if (IS_ERR(dentry)) { |
654 | err = PTR_ERR(dentry); | |
bd4c625c LT |
655 | goto out; |
656 | } | |
657 | ||
8b6dd72a | 658 | down_read(&REISERFS_I(inode)->i_xattr_sem); |
d984561b | 659 | |
2b0143b5 | 660 | isize = i_size_read(d_inode(dentry)); |
bd4c625c LT |
661 | |
662 | /* Just return the size needed */ | |
663 | if (buffer == NULL) { | |
664 | err = isize - sizeof(struct reiserfs_xattr_header); | |
8b6dd72a | 665 | goto out_unlock; |
bd4c625c LT |
666 | } |
667 | ||
668 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { | |
669 | err = -ERANGE; | |
8b6dd72a | 670 | goto out_unlock; |
bd4c625c LT |
671 | } |
672 | ||
673 | while (file_pos < isize) { | |
674 | size_t chunk; | |
675 | char *data; | |
676 | size_t skip = 0; | |
f3fb9e27 | 677 | |
bd4c625c LT |
678 | if (isize - file_pos > PAGE_CACHE_SIZE) |
679 | chunk = PAGE_CACHE_SIZE; | |
680 | else | |
681 | chunk = isize - file_pos; | |
682 | ||
2b0143b5 | 683 | page = reiserfs_get_page(d_inode(dentry), file_pos); |
bd4c625c LT |
684 | if (IS_ERR(page)) { |
685 | err = PTR_ERR(page); | |
8b6dd72a | 686 | goto out_unlock; |
bd4c625c LT |
687 | } |
688 | ||
689 | lock_page(page); | |
690 | data = page_address(page); | |
691 | if (file_pos == 0) { | |
692 | struct reiserfs_xattr_header *rxh = | |
693 | (struct reiserfs_xattr_header *)data; | |
694 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
695 | chunk -= skip; | |
696 | /* Magic doesn't match up.. */ | |
697 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { | |
698 | unlock_page(page); | |
699 | reiserfs_put_page(page); | |
a72bdb1c | 700 | reiserfs_warning(inode->i_sb, "jdm-20001", |
bd4c625c LT |
701 | "Invalid magic for xattr (%s) " |
702 | "associated with %k", name, | |
703 | INODE_PKEY(inode)); | |
704 | err = -EIO; | |
8b6dd72a | 705 | goto out_unlock; |
bd4c625c LT |
706 | } |
707 | hash = le32_to_cpu(rxh->h_hash); | |
708 | } | |
709 | memcpy(buffer + buffer_pos, data + skip, chunk); | |
710 | unlock_page(page); | |
711 | reiserfs_put_page(page); | |
712 | file_pos += chunk; | |
713 | buffer_pos += chunk; | |
714 | skip = 0; | |
715 | } | |
716 | err = isize - sizeof(struct reiserfs_xattr_header); | |
717 | ||
718 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != | |
719 | hash) { | |
a72bdb1c | 720 | reiserfs_warning(inode->i_sb, "jdm-20002", |
bd4c625c LT |
721 | "Invalid hash for xattr (%s) associated " |
722 | "with %k", name, INODE_PKEY(inode)); | |
723 | err = -EIO; | |
724 | } | |
725 | ||
8b6dd72a JM |
726 | out_unlock: |
727 | up_read(&REISERFS_I(inode)->i_xattr_sem); | |
3227e14c | 728 | dput(dentry); |
bd4c625c | 729 | |
a72bdb1c | 730 | out: |
bd4c625c | 731 | return err; |
1da177e4 LT |
732 | } |
733 | ||
48b32a35 JM |
734 | /* |
735 | * In order to implement different sets of xattr operations for each xattr | |
736 | * prefix with the generic xattr API, a filesystem should create a | |
737 | * null-terminated array of struct xattr_handler (one for each prefix) and | |
738 | * hang a pointer to it off of the s_xattr field of the superblock. | |
739 | * | |
740 | * The generic_fooxattr() functions will use this list to dispatch xattr | |
741 | * operations to the correct xattr_handler. | |
742 | */ | |
743 | #define for_each_xattr_handler(handlers, handler) \ | |
744 | for ((handler) = *(handlers)++; \ | |
745 | (handler) != NULL; \ | |
746 | (handler) = *(handlers)++) | |
1da177e4 | 747 | |
48b32a35 | 748 | /* This is the implementation for the xattr plugin infrastructure */ |
94d09a98 SH |
749 | static inline const struct xattr_handler * |
750 | find_xattr_handler_prefix(const struct xattr_handler **handlers, | |
48b32a35 | 751 | const char *name) |
1da177e4 | 752 | { |
94d09a98 | 753 | const struct xattr_handler *xah; |
bd4c625c | 754 | |
48b32a35 JM |
755 | if (!handlers) |
756 | return NULL; | |
bd4c625c | 757 | |
48b32a35 JM |
758 | for_each_xattr_handler(handlers, xah) { |
759 | if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0) | |
760 | break; | |
bd4c625c LT |
761 | } |
762 | ||
48b32a35 | 763 | return xah; |
bd4c625c | 764 | } |
1da177e4 | 765 | |
1da177e4 LT |
766 | |
767 | /* | |
768 | * Inode operation getxattr() | |
1da177e4 LT |
769 | */ |
770 | ssize_t | |
bd4c625c LT |
771 | reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, |
772 | size_t size) | |
1da177e4 | 773 | { |
94d09a98 | 774 | const struct xattr_handler *handler; |
bd4c625c | 775 | |
431547b3 | 776 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 777 | |
2b0143b5 | 778 | if (!handler || get_inode_sd_version(d_inode(dentry)) == STAT_DATA_V1) |
bd4c625c LT |
779 | return -EOPNOTSUPP; |
780 | ||
431547b3 | 781 | return handler->get(dentry, name, buffer, size, handler->flags); |
1da177e4 LT |
782 | } |
783 | ||
1da177e4 LT |
784 | /* |
785 | * Inode operation setxattr() | |
786 | * | |
2b0143b5 | 787 | * d_inode(dentry)->i_mutex down |
1da177e4 LT |
788 | */ |
789 | int | |
bd4c625c LT |
790 | reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
791 | size_t size, int flags) | |
1da177e4 | 792 | { |
94d09a98 | 793 | const struct xattr_handler *handler; |
bd4c625c | 794 | |
431547b3 | 795 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a35 | 796 | |
2b0143b5 | 797 | if (!handler || get_inode_sd_version(d_inode(dentry)) == STAT_DATA_V1) |
bd4c625c LT |
798 | return -EOPNOTSUPP; |
799 | ||
431547b3 | 800 | return handler->set(dentry, name, value, size, flags, handler->flags); |
1da177e4 LT |
801 | } |
802 | ||
803 | /* | |
804 | * Inode operation removexattr() | |
805 | * | |
2b0143b5 | 806 | * d_inode(dentry)->i_mutex down |
1da177e4 | 807 | */ |
bd4c625c | 808 | int reiserfs_removexattr(struct dentry *dentry, const char *name) |
1da177e4 | 809 | { |
94d09a98 | 810 | const struct xattr_handler *handler; |
f3fb9e27 | 811 | |
431547b3 | 812 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
1da177e4 | 813 | |
2b0143b5 | 814 | if (!handler || get_inode_sd_version(d_inode(dentry)) == STAT_DATA_V1) |
bd4c625c | 815 | return -EOPNOTSUPP; |
1da177e4 | 816 | |
431547b3 | 817 | return handler->set(dentry, name, NULL, 0, XATTR_REPLACE, handler->flags); |
1da177e4 LT |
818 | } |
819 | ||
48b32a35 | 820 | struct listxattr_buf { |
4acf381e | 821 | struct dir_context ctx; |
48b32a35 JM |
822 | size_t size; |
823 | size_t pos; | |
824 | char *buf; | |
431547b3 | 825 | struct dentry *dentry; |
1da177e4 LT |
826 | }; |
827 | ||
ac7576f4 MS |
828 | static int listxattr_filler(struct dir_context *ctx, const char *name, |
829 | int namelen, loff_t offset, u64 ino, | |
830 | unsigned int d_type) | |
1da177e4 | 831 | { |
ac7576f4 MS |
832 | struct listxattr_buf *b = |
833 | container_of(ctx, struct listxattr_buf, ctx); | |
48b32a35 | 834 | size_t size; |
f3fb9e27 | 835 | |
48b32a35 JM |
836 | if (name[0] != '.' || |
837 | (namelen != 1 && (name[1] != '.' || namelen != 2))) { | |
94d09a98 | 838 | const struct xattr_handler *handler; |
f3fb9e27 | 839 | |
431547b3 | 840 | handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr, |
48b32a35 JM |
841 | name); |
842 | if (!handler) /* Unsupported xattr name */ | |
843 | return 0; | |
844 | if (b->buf) { | |
431547b3 CH |
845 | size = handler->list(b->dentry, b->buf + b->pos, |
846 | b->size, name, namelen, | |
847 | handler->flags); | |
48b32a35 JM |
848 | if (size > b->size) |
849 | return -ERANGE; | |
850 | } else { | |
431547b3 CH |
851 | size = handler->list(b->dentry, NULL, 0, name, |
852 | namelen, handler->flags); | |
bd4c625c | 853 | } |
bd4c625c | 854 | |
48b32a35 JM |
855 | b->pos += size; |
856 | } | |
bd4c625c | 857 | return 0; |
1da177e4 | 858 | } |
bd4c625c | 859 | |
1da177e4 LT |
860 | /* |
861 | * Inode operation listxattr() | |
862 | * | |
48b32a35 JM |
863 | * We totally ignore the generic listxattr here because it would be stupid |
864 | * not to. Since the xattrs are organized in a directory, we can just | |
865 | * readdir to find them. | |
1da177e4 | 866 | */ |
bd4c625c | 867 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
1da177e4 | 868 | { |
bd4c625c LT |
869 | struct dentry *dir; |
870 | int err = 0; | |
48b32a35 | 871 | struct listxattr_buf buf = { |
4acf381e | 872 | .ctx.actor = listxattr_filler, |
431547b3 | 873 | .dentry = dentry, |
48b32a35 JM |
874 | .buf = buffer, |
875 | .size = buffer ? size : 0, | |
876 | }; | |
bd4c625c | 877 | |
2b0143b5 | 878 | if (d_really_is_negative(dentry)) |
bd4c625c LT |
879 | return -EINVAL; |
880 | ||
677c9b2e | 881 | if (!dentry->d_sb->s_xattr || |
2b0143b5 | 882 | get_inode_sd_version(d_inode(dentry)) == STAT_DATA_V1) |
bd4c625c LT |
883 | return -EOPNOTSUPP; |
884 | ||
2b0143b5 | 885 | dir = open_xa_dir(d_inode(dentry), XATTR_REPLACE); |
bd4c625c LT |
886 | if (IS_ERR(dir)) { |
887 | err = PTR_ERR(dir); | |
888 | if (err == -ENODATA) | |
48b32a35 | 889 | err = 0; /* Not an error if there aren't any xattrs */ |
bd4c625c LT |
890 | goto out; |
891 | } | |
892 | ||
2b0143b5 DH |
893 | mutex_lock_nested(&d_inode(dir)->i_mutex, I_MUTEX_XATTR); |
894 | err = reiserfs_readdir_inode(d_inode(dir), &buf.ctx); | |
895 | mutex_unlock(&d_inode(dir)->i_mutex); | |
bd4c625c | 896 | |
48b32a35 JM |
897 | if (!err) |
898 | err = buf.pos; | |
bd4c625c | 899 | |
3227e14c | 900 | dput(dir); |
8b6dd72a | 901 | out: |
bd4c625c | 902 | return err; |
1da177e4 LT |
903 | } |
904 | ||
a72bdb1c | 905 | static int create_privroot(struct dentry *dentry) |
1da177e4 | 906 | { |
a72bdb1c | 907 | int err; |
2b0143b5 | 908 | struct inode *inode = d_inode(dentry->d_parent); |
f3fb9e27 | 909 | |
5a6059c3 JM |
910 | WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex)); |
911 | ||
6c17675e | 912 | err = xattr_mkdir(inode, dentry, 0700); |
2b0143b5 | 913 | if (err || d_really_is_negative(dentry)) { |
edcc37a0 AV |
914 | reiserfs_warning(dentry->d_sb, "jdm-20006", |
915 | "xattrs/ACLs enabled and couldn't " | |
916 | "find/create .reiserfs_priv. " | |
917 | "Failing mount."); | |
918 | return -EOPNOTSUPP; | |
bd4c625c LT |
919 | } |
920 | ||
2b0143b5 | 921 | d_inode(dentry)->i_flags |= S_PRIVATE; |
edcc37a0 AV |
922 | reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr " |
923 | "storage.\n", PRIVROOT_NAME); | |
bd4c625c | 924 | |
edcc37a0 | 925 | return 0; |
1da177e4 LT |
926 | } |
927 | ||
12abb35a JM |
928 | #else |
929 | int __init reiserfs_xattr_register_handlers(void) { return 0; } | |
930 | void reiserfs_xattr_unregister_handlers(void) {} | |
931 | static int create_privroot(struct dentry *dentry) { return 0; } | |
932 | #endif | |
933 | ||
934 | /* Actual operations that are exported to VFS-land */ | |
da02eb72 | 935 | static const struct xattr_handler *reiserfs_xattr_handlers[] = { |
12abb35a JM |
936 | #ifdef CONFIG_REISERFS_FS_XATTR |
937 | &reiserfs_xattr_user_handler, | |
938 | &reiserfs_xattr_trusted_handler, | |
939 | #endif | |
940 | #ifdef CONFIG_REISERFS_FS_SECURITY | |
941 | &reiserfs_xattr_security_handler, | |
942 | #endif | |
943 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL | |
47f70d08 CH |
944 | &posix_acl_access_xattr_handler, |
945 | &posix_acl_default_xattr_handler, | |
12abb35a JM |
946 | #endif |
947 | NULL | |
948 | }; | |
949 | ||
a72bdb1c | 950 | static int xattr_mount_check(struct super_block *s) |
1da177e4 | 951 | { |
098297b2 JM |
952 | /* |
953 | * We need generation numbers to ensure that the oid mapping is correct | |
954 | * v3.5 filesystems don't have them. | |
955 | */ | |
48b32a35 JM |
956 | if (old_format_only(s)) { |
957 | if (reiserfs_xattrs_optional(s)) { | |
098297b2 JM |
958 | /* |
959 | * Old format filesystem, but optional xattrs have | |
960 | * been enabled. Error out. | |
961 | */ | |
48b32a35 JM |
962 | reiserfs_warning(s, "jdm-2005", |
963 | "xattrs/ACLs not supported " | |
964 | "on pre-v3.6 format filesystems. " | |
965 | "Failing mount."); | |
966 | return -EOPNOTSUPP; | |
967 | } | |
a72bdb1c JM |
968 | } |
969 | ||
970 | return 0; | |
1da177e4 LT |
971 | } |
972 | ||
10556cb2 | 973 | int reiserfs_permission(struct inode *inode, int mask) |
b83674c0 JM |
974 | { |
975 | /* | |
976 | * We don't do permission checks on the internal objects. | |
977 | * Permissions are determined by the "owning" object. | |
978 | */ | |
979 | if (IS_PRIVATE(inode)) | |
980 | return 0; | |
981 | ||
2830ba7f | 982 | return generic_permission(inode, mask); |
b83674c0 JM |
983 | } |
984 | ||
0b728e19 | 985 | static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 986 | { |
cac36f70 | 987 | return -EPERM; |
1da177e4 LT |
988 | } |
989 | ||
e16404ed | 990 | static const struct dentry_operations xattr_lookup_poison_ops = { |
cac36f70 | 991 | .d_revalidate = xattr_hide_revalidate, |
1da177e4 LT |
992 | }; |
993 | ||
edcc37a0 AV |
994 | int reiserfs_lookup_privroot(struct super_block *s) |
995 | { | |
996 | struct dentry *dentry; | |
997 | int err = 0; | |
998 | ||
999 | /* If we don't have the privroot located yet - go find it */ | |
2b0143b5 | 1000 | mutex_lock(&d_inode(s->s_root)->i_mutex); |
edcc37a0 AV |
1001 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, |
1002 | strlen(PRIVROOT_NAME)); | |
1003 | if (!IS_ERR(dentry)) { | |
1004 | REISERFS_SB(s)->priv_root = dentry; | |
fb045adb | 1005 | d_set_d_op(dentry, &xattr_lookup_poison_ops); |
2b0143b5 DH |
1006 | if (d_really_is_positive(dentry)) |
1007 | d_inode(dentry)->i_flags |= S_PRIVATE; | |
edcc37a0 AV |
1008 | } else |
1009 | err = PTR_ERR(dentry); | |
2b0143b5 | 1010 | mutex_unlock(&d_inode(s->s_root)->i_mutex); |
edcc37a0 AV |
1011 | |
1012 | return err; | |
1013 | } | |
1014 | ||
098297b2 JM |
1015 | /* |
1016 | * We need to take a copy of the mount flags since things like | |
1da177e4 | 1017 | * MS_RDONLY don't get set until *after* we're called. |
098297b2 JM |
1018 | * mount_flags != mount_options |
1019 | */ | |
bd4c625c | 1020 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
1da177e4 | 1021 | { |
bd4c625c | 1022 | int err = 0; |
ab17c4f0 | 1023 | struct dentry *privroot = REISERFS_SB(s)->priv_root; |
bd4c625c | 1024 | |
a72bdb1c JM |
1025 | err = xattr_mount_check(s); |
1026 | if (err) | |
bd4c625c | 1027 | goto error; |
bd4c625c | 1028 | |
2b0143b5 DH |
1029 | if (d_really_is_negative(privroot) && !(mount_flags & MS_RDONLY)) { |
1030 | mutex_lock(&d_inode(s->s_root)->i_mutex); | |
edcc37a0 | 1031 | err = create_privroot(REISERFS_SB(s)->priv_root); |
2b0143b5 | 1032 | mutex_unlock(&d_inode(s->s_root)->i_mutex); |
bd4c625c | 1033 | } |
ab17c4f0 | 1034 | |
2b0143b5 | 1035 | if (d_really_is_positive(privroot)) { |
48b32a35 | 1036 | s->s_xattr = reiserfs_xattr_handlers; |
2b0143b5 | 1037 | mutex_lock(&d_inode(privroot)->i_mutex); |
ab17c4f0 JM |
1038 | if (!REISERFS_SB(s)->xattr_root) { |
1039 | struct dentry *dentry; | |
f3fb9e27 | 1040 | |
ab17c4f0 JM |
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 | } | |
2b0143b5 | 1048 | mutex_unlock(&d_inode(privroot)->i_mutex); |
ab17c4f0 | 1049 | } |
48b32a35 | 1050 | |
a72bdb1c | 1051 | error: |
bd4c625c | 1052 | if (err) { |
a228bf8f JM |
1053 | clear_bit(REISERFS_XATTRS_USER, &REISERFS_SB(s)->s_mount_opt); |
1054 | clear_bit(REISERFS_POSIXACL, &REISERFS_SB(s)->s_mount_opt); | |
bd4c625c LT |
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 | } |