Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/fs/reiserfs/xattr.c | |
4 | * | |
5 | * Copyright (c) 2002 by Jeff Mahoney, <jeffm@suse.com> | |
6 | * | |
7 | */ | |
8 | ||
9 | /* | |
10 | * In order to implement EA/ACLs in a clean, backwards compatible manner, | |
11 | * they are implemented as files in a "private" directory. | |
12 | * Each EA is in it's own file, with the directory layout like so (/ is assumed | |
13 | * to be relative to fs root). Inside the /.reiserfs_priv/xattrs directory, | |
14 | * directories named using the capital-hex form of the objectid and | |
15 | * generation number are used. Inside each directory are individual files | |
16 | * named with the name of the extended attribute. | |
17 | * | |
18 | * So, for objectid 12648430, we could have: | |
19 | * /.reiserfs_priv/xattrs/C0FFEE.0/system.posix_acl_access | |
20 | * /.reiserfs_priv/xattrs/C0FFEE.0/system.posix_acl_default | |
21 | * /.reiserfs_priv/xattrs/C0FFEE.0/user.Content-Type | |
22 | * .. or similar. | |
23 | * | |
24 | * The file contents are the text of the EA. The size is known based on the | |
25 | * stat data describing the file. | |
26 | * | |
27 | * In the case of system.posix_acl_access and system.posix_acl_default, since | |
28 | * these are special cases for filesystem ACLs, they are interpreted by the | |
29 | * kernel, in addition, they are negatively and positively cached and attached | |
30 | * to the inode so that unnecessary lookups are avoided. | |
d984561b JM |
31 | * |
32 | * Locking works like so: | |
8b6dd72a JM |
33 | * Directory components (xattr root, xattr dir) are protectd by their i_mutex. |
34 | * The xattrs themselves are protected by the xattr_sem. | |
1da177e4 LT |
35 | */ |
36 | ||
f466c6fd | 37 | #include "reiserfs.h" |
16f7e0fe | 38 | #include <linux/capability.h> |
1da177e4 LT |
39 | #include <linux/dcache.h> |
40 | #include <linux/namei.h> | |
41 | #include <linux/errno.h> | |
5a0e3ad6 | 42 | #include <linux/gfp.h> |
1da177e4 LT |
43 | #include <linux/fs.h> |
44 | #include <linux/file.h> | |
45 | #include <linux/pagemap.h> | |
46 | #include <linux/xattr.h> | |
c45ac888 | 47 | #include "xattr.h" |
a3063ab8 | 48 | #include "acl.h" |
17093991 | 49 | #include <linux/uaccess.h> |
3277c39f | 50 | #include <net/checksum.h> |
1da177e4 | 51 | #include <linux/stat.h> |
6c17675e | 52 | #include <linux/quotaops.h> |
431547b3 | 53 | #include <linux/security.h> |
47f70d08 | 54 | #include <linux/posix_acl_xattr.h> |
387b96a5 | 55 | #include <linux/xattr.h> |
1da177e4 | 56 | |
1da177e4 LT |
57 | #define PRIVROOT_NAME ".reiserfs_priv" |
58 | #define XAROOT_NAME "xattrs" | |
59 | ||
1da177e4 | 60 | |
098297b2 JM |
61 | /* |
62 | * Helpers for inode ops. We do this so that we don't have all the VFS | |
6c17675e | 63 | * overhead and also for proper i_mutex annotation. |
098297b2 JM |
64 | * dir->i_mutex must be held for all of them. |
65 | */ | |
3a355cc6 | 66 | #ifdef CONFIG_REISERFS_FS_XATTR |
6c17675e | 67 | static int xattr_create(struct inode *dir, struct dentry *dentry, int mode) |
1da177e4 | 68 | { |
5955102c | 69 | BUG_ON(!inode_is_locked(dir)); |
6c960e68 | 70 | return dir->i_op->create(&nop_mnt_idmap, dir, dentry, mode, true); |
6c17675e | 71 | } |
3a355cc6 | 72 | #endif |
bd4c625c | 73 | |
18bb1db3 | 74 | static int xattr_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
6c17675e | 75 | { |
5955102c | 76 | BUG_ON(!inode_is_locked(dir)); |
c54bd91e | 77 | return dir->i_op->mkdir(&nop_mnt_idmap, dir, dentry, mode); |
6c17675e | 78 | } |
bd4c625c | 79 | |
098297b2 JM |
80 | /* |
81 | * We use I_MUTEX_CHILD here to silence lockdep. It's safe because xattr | |
6c17675e JM |
82 | * mutation ops aren't called during rename or splace, which are the |
83 | * only other users of I_MUTEX_CHILD. It violates the ordering, but that's | |
098297b2 JM |
84 | * better than allocating another subclass just for this code. |
85 | */ | |
6c17675e JM |
86 | static int xattr_unlink(struct inode *dir, struct dentry *dentry) |
87 | { | |
88 | int error; | |
f3fb9e27 | 89 | |
5955102c | 90 | BUG_ON(!inode_is_locked(dir)); |
bd4c625c | 91 | |
5955102c | 92 | inode_lock_nested(d_inode(dentry), I_MUTEX_CHILD); |
6c17675e | 93 | error = dir->i_op->unlink(dir, dentry); |
5955102c | 94 | inode_unlock(d_inode(dentry)); |
6c17675e JM |
95 | |
96 | if (!error) | |
97 | d_delete(dentry); | |
98 | return error; | |
99 | } | |
100 | ||
101 | static int xattr_rmdir(struct inode *dir, struct dentry *dentry) | |
102 | { | |
103 | int error; | |
f3fb9e27 | 104 | |
5955102c | 105 | BUG_ON(!inode_is_locked(dir)); |
6c17675e | 106 | |
5955102c | 107 | inode_lock_nested(d_inode(dentry), I_MUTEX_CHILD); |
6c17675e JM |
108 | error = dir->i_op->rmdir(dir, dentry); |
109 | if (!error) | |
2b0143b5 | 110 | d_inode(dentry)->i_flags |= S_DEAD; |
5955102c | 111 | inode_unlock(d_inode(dentry)); |
6c17675e JM |
112 | if (!error) |
113 | d_delete(dentry); | |
6c17675e JM |
114 | |
115 | return error; | |
116 | } | |
117 | ||
6c17675e JM |
118 | #define xattr_may_create(flags) (!flags || flags & XATTR_CREATE) |
119 | ||
ab17c4f0 | 120 | static struct dentry *open_xa_root(struct super_block *sb, int flags) |
6c17675e | 121 | { |
ab17c4f0 JM |
122 | struct dentry *privroot = REISERFS_SB(sb)->priv_root; |
123 | struct dentry *xaroot; | |
f3fb9e27 | 124 | |
2b0143b5 | 125 | if (d_really_is_negative(privroot)) |
60e4cf67 | 126 | return ERR_PTR(-EOPNOTSUPP); |
6c17675e | 127 | |
5955102c | 128 | inode_lock_nested(d_inode(privroot), I_MUTEX_XATTR); |
6c17675e | 129 | |
ab17c4f0 | 130 | xaroot = dget(REISERFS_SB(sb)->xattr_root); |
ceb5edc4 | 131 | if (!xaroot) |
60e4cf67 | 132 | xaroot = ERR_PTR(-EOPNOTSUPP); |
2b0143b5 | 133 | else if (d_really_is_negative(xaroot)) { |
ab17c4f0 | 134 | int err = -ENODATA; |
f3fb9e27 | 135 | |
5a6059c3 | 136 | if (xattr_may_create(flags)) |
2b0143b5 | 137 | err = xattr_mkdir(d_inode(privroot), xaroot, 0700); |
9b7f3755 | 138 | if (err) { |
ab17c4f0 JM |
139 | dput(xaroot); |
140 | xaroot = ERR_PTR(err); | |
9b7f3755 | 141 | } |
bd4c625c | 142 | } |
6c17675e | 143 | |
5955102c | 144 | inode_unlock(d_inode(privroot)); |
ab17c4f0 | 145 | return xaroot; |
1da177e4 LT |
146 | } |
147 | ||
bd4c625c | 148 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
1da177e4 | 149 | { |
bd4c625c LT |
150 | struct dentry *xaroot, *xadir; |
151 | char namebuf[17]; | |
152 | ||
6c17675e | 153 | xaroot = open_xa_root(inode->i_sb, flags); |
9b7f3755 | 154 | if (IS_ERR(xaroot)) |
bd4c625c | 155 | return xaroot; |
bd4c625c | 156 | |
bd4c625c LT |
157 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
158 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), | |
159 | inode->i_generation); | |
bd4c625c | 160 | |
5955102c | 161 | inode_lock_nested(d_inode(xaroot), I_MUTEX_XATTR); |
ab17c4f0 JM |
162 | |
163 | xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf)); | |
2b0143b5 | 164 | if (!IS_ERR(xadir) && d_really_is_negative(xadir)) { |
ab17c4f0 | 165 | int err = -ENODATA; |
f3fb9e27 | 166 | |
ab17c4f0 | 167 | if (xattr_may_create(flags)) |
2b0143b5 | 168 | err = xattr_mkdir(d_inode(xaroot), xadir, 0700); |
ab17c4f0 JM |
169 | if (err) { |
170 | dput(xadir); | |
171 | xadir = ERR_PTR(err); | |
172 | } | |
173 | } | |
174 | ||
5955102c | 175 | inode_unlock(d_inode(xaroot)); |
bd4c625c LT |
176 | dput(xaroot); |
177 | return xadir; | |
1da177e4 LT |
178 | } |
179 | ||
098297b2 JM |
180 | /* |
181 | * The following are side effects of other operations that aren't explicitly | |
48b32a35 | 182 | * modifying extended attributes. This includes operations such as permissions |
098297b2 JM |
183 | * or ownership changes, object deletions, etc. |
184 | */ | |
a41f1a47 | 185 | struct reiserfs_dentry_buf { |
4acf381e | 186 | struct dir_context ctx; |
a41f1a47 JM |
187 | struct dentry *xadir; |
188 | int count; | |
b10298d5 | 189 | int err; |
a41f1a47 JM |
190 | struct dentry *dentries[8]; |
191 | }; | |
bd4c625c | 192 | |
25885a35 | 193 | static bool |
ac7576f4 MS |
194 | fill_with_dentries(struct dir_context *ctx, const char *name, int namelen, |
195 | loff_t offset, u64 ino, unsigned int d_type) | |
a72bdb1c | 196 | { |
ac7576f4 MS |
197 | struct reiserfs_dentry_buf *dbuf = |
198 | container_of(ctx, struct reiserfs_dentry_buf, ctx); | |
a72bdb1c | 199 | struct dentry *dentry; |
f3fb9e27 | 200 | |
5955102c | 201 | WARN_ON_ONCE(!inode_is_locked(d_inode(dbuf->xadir))); |
bd4c625c | 202 | |
a41f1a47 | 203 | if (dbuf->count == ARRAY_SIZE(dbuf->dentries)) |
25885a35 | 204 | return false; |
bd4c625c | 205 | |
35e5cbc0 JK |
206 | if (name[0] == '.' && (namelen < 2 || |
207 | (namelen == 2 && name[1] == '.'))) | |
25885a35 | 208 | return true; |
bd4c625c | 209 | |
a41f1a47 | 210 | dentry = lookup_one_len(name, dbuf->xadir, namelen); |
a72bdb1c | 211 | if (IS_ERR(dentry)) { |
b10298d5 | 212 | dbuf->err = PTR_ERR(dentry); |
25885a35 | 213 | return false; |
2b0143b5 | 214 | } else if (d_really_is_negative(dentry)) { |
a41f1a47 JM |
215 | /* A directory entry exists, but no file? */ |
216 | reiserfs_error(dentry->d_sb, "xattr-20003", | |
a455589f AV |
217 | "Corrupted directory: xattr %pd listed but " |
218 | "not found for file %pd.\n", | |
219 | dentry, dbuf->xadir); | |
a41f1a47 | 220 | dput(dentry); |
b10298d5 | 221 | dbuf->err = -EIO; |
25885a35 | 222 | return false; |
bd4c625c | 223 | } |
1da177e4 | 224 | |
a41f1a47 | 225 | dbuf->dentries[dbuf->count++] = dentry; |
25885a35 | 226 | return true; |
1da177e4 LT |
227 | } |
228 | ||
a41f1a47 JM |
229 | static void |
230 | cleanup_dentry_buf(struct reiserfs_dentry_buf *buf) | |
1da177e4 | 231 | { |
a41f1a47 | 232 | int i; |
f3fb9e27 | 233 | |
a41f1a47 JM |
234 | for (i = 0; i < buf->count; i++) |
235 | if (buf->dentries[i]) | |
236 | dput(buf->dentries[i]); | |
a72bdb1c JM |
237 | } |
238 | ||
a41f1a47 JM |
239 | static int reiserfs_for_each_xattr(struct inode *inode, |
240 | int (*action)(struct dentry *, void *), | |
241 | void *data) | |
a72bdb1c | 242 | { |
a41f1a47 JM |
243 | struct dentry *dir; |
244 | int i, err = 0; | |
a41f1a47 | 245 | struct reiserfs_dentry_buf buf = { |
4acf381e | 246 | .ctx.actor = fill_with_dentries, |
a41f1a47 | 247 | }; |
1da177e4 | 248 | |
a72bdb1c JM |
249 | /* Skip out, an xattr has no xattrs associated with it */ |
250 | if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1) | |
251 | return 0; | |
1da177e4 | 252 | |
6c17675e | 253 | dir = open_xa_dir(inode, XATTR_REPLACE); |
a72bdb1c JM |
254 | if (IS_ERR(dir)) { |
255 | err = PTR_ERR(dir); | |
256 | goto out; | |
2b0143b5 | 257 | } else if (d_really_is_negative(dir)) { |
a41f1a47 JM |
258 | err = 0; |
259 | goto out_dir; | |
a72bdb1c | 260 | } |
1da177e4 | 261 | |
5955102c | 262 | inode_lock_nested(d_inode(dir), I_MUTEX_XATTR); |
27026a05 | 263 | |
a41f1a47 | 264 | buf.xadir = dir; |
cd62cdae | 265 | while (1) { |
2b0143b5 | 266 | err = reiserfs_readdir_inode(d_inode(dir), &buf.ctx); |
cd62cdae AV |
267 | if (err) |
268 | break; | |
b10298d5 JH |
269 | if (buf.err) { |
270 | err = buf.err; | |
271 | break; | |
272 | } | |
cd62cdae AV |
273 | if (!buf.count) |
274 | break; | |
275 | for (i = 0; !err && i < buf.count && buf.dentries[i]; i++) { | |
a41f1a47 | 276 | struct dentry *dentry = buf.dentries[i]; |
1da177e4 | 277 | |
e36cb0b8 | 278 | if (!d_is_dir(dentry)) |
cd62cdae | 279 | err = action(dentry, data); |
1da177e4 | 280 | |
a41f1a47 JM |
281 | dput(dentry); |
282 | buf.dentries[i] = NULL; | |
bd4c625c | 283 | } |
cd62cdae AV |
284 | if (err) |
285 | break; | |
a41f1a47 | 286 | buf.count = 0; |
8b6dd72a | 287 | } |
5955102c | 288 | inode_unlock(d_inode(dir)); |
1da177e4 | 289 | |
a41f1a47 | 290 | cleanup_dentry_buf(&buf); |
1da177e4 | 291 | |
d984561b | 292 | if (!err) { |
098297b2 JM |
293 | /* |
294 | * We start a transaction here to avoid a ABBA situation | |
a41f1a47 JM |
295 | * between the xattr root's i_mutex and the journal lock. |
296 | * This doesn't incur much additional overhead since the | |
297 | * new transaction will just nest inside the | |
098297b2 JM |
298 | * outer transaction. |
299 | */ | |
a41f1a47 JM |
300 | int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + |
301 | 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); | |
302 | struct reiserfs_transaction_handle th; | |
f3fb9e27 | 303 | |
4c05141d | 304 | reiserfs_write_lock(inode->i_sb); |
a41f1a47 | 305 | err = journal_begin(&th, inode->i_sb, blocks); |
4c05141d | 306 | reiserfs_write_unlock(inode->i_sb); |
a41f1a47 JM |
307 | if (!err) { |
308 | int jerror; | |
f3fb9e27 | 309 | |
5955102c | 310 | inode_lock_nested(d_inode(dir->d_parent), |
4c05141d | 311 | I_MUTEX_XATTR); |
a41f1a47 | 312 | err = action(dir, data); |
4c05141d | 313 | reiserfs_write_lock(inode->i_sb); |
58d85426 | 314 | jerror = journal_end(&th); |
4c05141d | 315 | reiserfs_write_unlock(inode->i_sb); |
5955102c | 316 | inode_unlock(d_inode(dir->d_parent)); |
a41f1a47 JM |
317 | err = jerror ?: err; |
318 | } | |
a72bdb1c | 319 | } |
a41f1a47 JM |
320 | out_dir: |
321 | dput(dir); | |
a72bdb1c | 322 | out: |
394440d4 JM |
323 | /* |
324 | * -ENODATA: this object doesn't have any xattrs | |
325 | * -EOPNOTSUPP: this file system doesn't have xattrs enabled on disk. | |
326 | * Neither are errors | |
327 | */ | |
328 | if (err == -ENODATA || err == -EOPNOTSUPP) | |
a41f1a47 | 329 | err = 0; |
a72bdb1c JM |
330 | return err; |
331 | } | |
1da177e4 | 332 | |
a41f1a47 | 333 | static int delete_one_xattr(struct dentry *dentry, void *data) |
a72bdb1c | 334 | { |
2b0143b5 | 335 | struct inode *dir = d_inode(dentry->d_parent); |
1da177e4 | 336 | |
a41f1a47 | 337 | /* This is the xattr dir, handle specially. */ |
e36cb0b8 | 338 | if (d_is_dir(dentry)) |
a41f1a47 | 339 | return xattr_rmdir(dir, dentry); |
1da177e4 | 340 | |
a41f1a47 JM |
341 | return xattr_unlink(dir, dentry); |
342 | } | |
bd4c625c | 343 | |
a41f1a47 JM |
344 | static int chown_one_xattr(struct dentry *dentry, void *data) |
345 | { | |
346 | struct iattr *attrs = data; | |
4a857011 JM |
347 | int ia_valid = attrs->ia_valid; |
348 | int err; | |
349 | ||
350 | /* | |
351 | * We only want the ownership bits. Otherwise, we'll do | |
352 | * things like change a directory to a regular file if | |
353 | * ATTR_MODE is set. | |
354 | */ | |
355 | attrs->ia_valid &= (ATTR_UID|ATTR_GID); | |
c1632a0f | 356 | err = reiserfs_setattr(&nop_mnt_idmap, dentry, attrs); |
4a857011 JM |
357 | attrs->ia_valid = ia_valid; |
358 | ||
359 | return err; | |
a41f1a47 | 360 | } |
1da177e4 | 361 | |
a41f1a47 JM |
362 | /* No i_mutex, but the inode is unconnected. */ |
363 | int reiserfs_delete_xattrs(struct inode *inode) | |
364 | { | |
365 | int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); | |
f3fb9e27 | 366 | |
a41f1a47 JM |
367 | if (err) |
368 | reiserfs_warning(inode->i_sb, "jdm-20004", | |
369 | "Couldn't delete all xattrs (%d)\n", err); | |
a72bdb1c JM |
370 | return err; |
371 | } | |
1da177e4 | 372 | |
a41f1a47 | 373 | /* inode->i_mutex: down */ |
a72bdb1c JM |
374 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
375 | { | |
a41f1a47 | 376 | int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); |
f3fb9e27 | 377 | |
8b6dd72a JM |
378 | if (err) |
379 | reiserfs_warning(inode->i_sb, "jdm-20007", | |
380 | "Couldn't chown all xattrs (%d)\n", err); | |
a72bdb1c | 381 | return err; |
1da177e4 LT |
382 | } |
383 | ||
a72bdb1c | 384 | #ifdef CONFIG_REISERFS_FS_XATTR |
098297b2 JM |
385 | /* |
386 | * Returns a dentry corresponding to a specific extended attribute file | |
a72bdb1c | 387 | * for the inode. If flags allow, the file is created. Otherwise, a |
098297b2 JM |
388 | * valid or negative dentry, or an error is returned. |
389 | */ | |
48b32a35 JM |
390 | static struct dentry *xattr_lookup(struct inode *inode, const char *name, |
391 | int flags) | |
1da177e4 | 392 | { |
a72bdb1c JM |
393 | struct dentry *xadir, *xafile; |
394 | int err = 0; | |
395 | ||
396 | xadir = open_xa_dir(inode, flags); | |
6c17675e | 397 | if (IS_ERR(xadir)) |
a72bdb1c | 398 | return ERR_CAST(xadir); |
a72bdb1c | 399 | |
5955102c | 400 | inode_lock_nested(d_inode(xadir), I_MUTEX_XATTR); |
a72bdb1c JM |
401 | xafile = lookup_one_len(name, xadir, strlen(name)); |
402 | if (IS_ERR(xafile)) { | |
6c17675e JM |
403 | err = PTR_ERR(xafile); |
404 | goto out; | |
bd4c625c | 405 | } |
a72bdb1c | 406 | |
2b0143b5 | 407 | if (d_really_is_positive(xafile) && (flags & XATTR_CREATE)) |
6c17675e | 408 | err = -EEXIST; |
a72bdb1c | 409 | |
2b0143b5 | 410 | if (d_really_is_negative(xafile)) { |
6c17675e | 411 | err = -ENODATA; |
5a6059c3 | 412 | if (xattr_may_create(flags)) |
2b0143b5 | 413 | err = xattr_create(d_inode(xadir), xafile, |
6c17675e | 414 | 0700|S_IFREG); |
a72bdb1c JM |
415 | } |
416 | ||
6c17675e JM |
417 | if (err) |
418 | dput(xafile); | |
a72bdb1c | 419 | out: |
5955102c | 420 | inode_unlock(d_inode(xadir)); |
a72bdb1c JM |
421 | dput(xadir); |
422 | if (err) | |
6c17675e | 423 | return ERR_PTR(err); |
a72bdb1c | 424 | return xafile; |
1da177e4 LT |
425 | } |
426 | ||
1da177e4 | 427 | /* Internal operations on file data */ |
bd4c625c | 428 | static inline void reiserfs_put_page(struct page *page) |
1da177e4 | 429 | { |
bd4c625c | 430 | kunmap(page); |
09cbfeaf | 431 | put_page(page); |
1da177e4 LT |
432 | } |
433 | ||
ec6ea56b | 434 | static struct page *reiserfs_get_page(struct inode *dir, size_t n) |
1da177e4 | 435 | { |
bd4c625c LT |
436 | struct address_space *mapping = dir->i_mapping; |
437 | struct page *page; | |
098297b2 JM |
438 | /* |
439 | * We can deadlock if we try to free dentries, | |
440 | * and an unlink/rmdir has just occurred - GFP_NOFS avoids this | |
441 | */ | |
c4cdd038 | 442 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
09cbfeaf | 443 | page = read_mapping_page(mapping, n >> PAGE_SHIFT, NULL); |
b0c971e7 | 444 | if (!IS_ERR(page)) |
bd4c625c | 445 | kmap(page); |
bd4c625c | 446 | return page; |
1da177e4 LT |
447 | } |
448 | ||
bd4c625c | 449 | static inline __u32 xattr_hash(const char *msg, int len) |
1da177e4 | 450 | { |
672cdd56 BV |
451 | /* |
452 | * csum_partial() gives different results for little-endian and | |
453 | * big endian hosts. Images created on little-endian hosts and | |
454 | * mounted on big-endian hosts(and vice versa) will see csum mismatches | |
455 | * when trying to fetch xattrs. Treating the hash as __wsum_t would | |
456 | * lower the frequency of mismatch. This is an endianness bug in | |
457 | * reiserfs. The return statement would result in a sparse warning. Do | |
458 | * not fix the sparse warning so as to not hide a reminder of the bug. | |
459 | */ | |
bd4c625c | 460 | return csum_partial(msg, len, 0); |
1da177e4 LT |
461 | } |
462 | ||
ba9d8cec VS |
463 | int reiserfs_commit_write(struct file *f, struct page *page, |
464 | unsigned from, unsigned to); | |
ba9d8cec | 465 | |
48b32a35 JM |
466 | static void update_ctime(struct inode *inode) |
467 | { | |
95582b00 | 468 | struct timespec64 now = current_time(inode); |
f3fb9e27 | 469 | |
1d3382cb | 470 | if (inode_unhashed(inode) || !inode->i_nlink || |
95582b00 | 471 | timespec64_equal(&inode->i_ctime, &now)) |
48b32a35 JM |
472 | return; |
473 | ||
02027d42 | 474 | inode->i_ctime = current_time(inode); |
48b32a35 JM |
475 | mark_inode_dirty(inode); |
476 | } | |
477 | ||
478 | static int lookup_and_delete_xattr(struct inode *inode, const char *name) | |
479 | { | |
480 | int err = 0; | |
481 | struct dentry *dentry, *xadir; | |
482 | ||
483 | xadir = open_xa_dir(inode, XATTR_REPLACE); | |
484 | if (IS_ERR(xadir)) | |
485 | return PTR_ERR(xadir); | |
486 | ||
5955102c | 487 | inode_lock_nested(d_inode(xadir), I_MUTEX_XATTR); |
48b32a35 JM |
488 | dentry = lookup_one_len(name, xadir, strlen(name)); |
489 | if (IS_ERR(dentry)) { | |
490 | err = PTR_ERR(dentry); | |
491 | goto out_dput; | |
492 | } | |
493 | ||
2b0143b5 DH |
494 | if (d_really_is_positive(dentry)) { |
495 | err = xattr_unlink(d_inode(xadir), dentry); | |
48b32a35 JM |
496 | update_ctime(inode); |
497 | } | |
498 | ||
499 | dput(dentry); | |
500 | out_dput: | |
5955102c | 501 | inode_unlock(d_inode(xadir)); |
48b32a35 JM |
502 | dput(xadir); |
503 | return err; | |
504 | } | |
505 | ||
ba9d8cec | 506 | |
1da177e4 LT |
507 | /* Generic extended attribute operations that can be used by xa plugins */ |
508 | ||
509 | /* | |
1b1dcc1b | 510 | * inode->i_mutex: down |
1da177e4 LT |
511 | */ |
512 | int | |
0ab2621e JM |
513 | reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, |
514 | struct inode *inode, const char *name, | |
515 | const void *buffer, size_t buffer_size, int flags) | |
1da177e4 | 516 | { |
bd4c625c | 517 | int err = 0; |
3227e14c | 518 | struct dentry *dentry; |
bd4c625c LT |
519 | struct page *page; |
520 | char *data; | |
bd4c625c LT |
521 | size_t file_pos = 0; |
522 | size_t buffer_pos = 0; | |
48b32a35 | 523 | size_t new_size; |
bd4c625c LT |
524 | __u32 xahash = 0; |
525 | ||
bd4c625c LT |
526 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
527 | return -EOPNOTSUPP; | |
528 | ||
4f3be1b5 FW |
529 | if (!buffer) { |
530 | err = lookup_and_delete_xattr(inode, name); | |
4f3be1b5 FW |
531 | return err; |
532 | } | |
533 | ||
48b32a35 | 534 | dentry = xattr_lookup(inode, name, flags); |
4c05141d | 535 | if (IS_ERR(dentry)) |
48b32a35 | 536 | return PTR_ERR(dentry); |
3f14fea6 | 537 | |
f3e22f48 | 538 | down_write(&REISERFS_I(inode)->i_xattr_sem); |
bd4c625c | 539 | |
8b6dd72a | 540 | xahash = xattr_hash(buffer, buffer_size); |
bd4c625c LT |
541 | while (buffer_pos < buffer_size || buffer_pos == 0) { |
542 | size_t chunk; | |
543 | size_t skip = 0; | |
09cbfeaf | 544 | size_t page_offset = (file_pos & (PAGE_SIZE - 1)); |
f3fb9e27 | 545 | |
09cbfeaf KS |
546 | if (buffer_size - buffer_pos > PAGE_SIZE) |
547 | chunk = PAGE_SIZE; | |
bd4c625c LT |
548 | else |
549 | chunk = buffer_size - buffer_pos; | |
550 | ||
2b0143b5 | 551 | page = reiserfs_get_page(d_inode(dentry), file_pos); |
bd4c625c LT |
552 | if (IS_ERR(page)) { |
553 | err = PTR_ERR(page); | |
48b32a35 | 554 | goto out_unlock; |
bd4c625c LT |
555 | } |
556 | ||
557 | lock_page(page); | |
558 | data = page_address(page); | |
559 | ||
560 | if (file_pos == 0) { | |
561 | struct reiserfs_xattr_header *rxh; | |
f3fb9e27 | 562 | |
bd4c625c | 563 | skip = file_pos = sizeof(struct reiserfs_xattr_header); |
09cbfeaf KS |
564 | if (chunk + skip > PAGE_SIZE) |
565 | chunk = PAGE_SIZE - skip; | |
bd4c625c LT |
566 | rxh = (struct reiserfs_xattr_header *)data; |
567 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); | |
568 | rxh->h_hash = cpu_to_le32(xahash); | |
569 | } | |
570 | ||
4c05141d | 571 | reiserfs_write_lock(inode->i_sb); |
ebdec241 | 572 | err = __reiserfs_write_begin(page, page_offset, chunk + skip); |
bd4c625c LT |
573 | if (!err) { |
574 | if (buffer) | |
575 | memcpy(data + skip, buffer + buffer_pos, chunk); | |
3227e14c JM |
576 | err = reiserfs_commit_write(NULL, page, page_offset, |
577 | page_offset + chunk + | |
578 | skip); | |
bd4c625c | 579 | } |
4c05141d | 580 | reiserfs_write_unlock(inode->i_sb); |
bd4c625c LT |
581 | unlock_page(page); |
582 | reiserfs_put_page(page); | |
583 | buffer_pos += chunk; | |
584 | file_pos += chunk; | |
585 | skip = 0; | |
586 | if (err || buffer_size == 0 || !buffer) | |
587 | break; | |
588 | } | |
589 | ||
48b32a35 | 590 | new_size = buffer_size + sizeof(struct reiserfs_xattr_header); |
2b0143b5 | 591 | if (!err && new_size < i_size_read(d_inode(dentry))) { |
48b32a35 | 592 | struct iattr newattrs = { |
02027d42 | 593 | .ia_ctime = current_time(inode), |
fb2162df | 594 | .ia_size = new_size, |
48b32a35 JM |
595 | .ia_valid = ATTR_SIZE | ATTR_CTIME, |
596 | }; | |
31370f62 | 597 | |
5955102c | 598 | inode_lock_nested(d_inode(dentry), I_MUTEX_XATTR); |
2b0143b5 | 599 | inode_dio_wait(d_inode(dentry)); |
31370f62 | 600 | |
c1632a0f | 601 | err = reiserfs_setattr(&nop_mnt_idmap, dentry, &newattrs); |
5955102c | 602 | inode_unlock(d_inode(dentry)); |
48b32a35 JM |
603 | } else |
604 | update_ctime(inode); | |
605 | out_unlock: | |
8b6dd72a | 606 | up_write(&REISERFS_I(inode)->i_xattr_sem); |
3227e14c | 607 | dput(dentry); |
48b32a35 JM |
608 | return err; |
609 | } | |
bd4c625c | 610 | |
0ab2621e JM |
611 | /* We need to start a transaction to maintain lock ordering */ |
612 | int reiserfs_xattr_set(struct inode *inode, const char *name, | |
613 | const void *buffer, size_t buffer_size, int flags) | |
48b32a35 | 614 | { |
0ab2621e JM |
615 | |
616 | struct reiserfs_transaction_handle th; | |
617 | int error, error2; | |
618 | size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size); | |
619 | ||
60e4cf67 JM |
620 | /* Check before we start a transaction and then do nothing. */ |
621 | if (!d_really_is_positive(REISERFS_SB(inode->i_sb)->priv_root)) | |
622 | return -EOPNOTSUPP; | |
623 | ||
0ab2621e JM |
624 | if (!(flags & XATTR_REPLACE)) |
625 | jbegin_count += reiserfs_xattr_jcreate_nblocks(inode); | |
626 | ||
627 | reiserfs_write_lock(inode->i_sb); | |
628 | error = journal_begin(&th, inode->i_sb, jbegin_count); | |
4c05141d | 629 | reiserfs_write_unlock(inode->i_sb); |
0ab2621e | 630 | if (error) { |
0ab2621e | 631 | return error; |
1da177e4 | 632 | } |
bd4c625c | 633 | |
0ab2621e JM |
634 | error = reiserfs_xattr_set_handle(&th, inode, name, |
635 | buffer, buffer_size, flags); | |
bd4c625c | 636 | |
4c05141d | 637 | reiserfs_write_lock(inode->i_sb); |
58d85426 | 638 | error2 = journal_end(&th); |
4c05141d | 639 | reiserfs_write_unlock(inode->i_sb); |
0ab2621e JM |
640 | if (error == 0) |
641 | error = error2; | |
0ab2621e JM |
642 | |
643 | return error; | |
1da177e4 LT |
644 | } |
645 | ||
646 | /* | |
1b1dcc1b | 647 | * inode->i_mutex: down |
1da177e4 LT |
648 | */ |
649 | int | |
48b32a35 | 650 | reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, |
bd4c625c | 651 | size_t buffer_size) |
1da177e4 | 652 | { |
bd4c625c | 653 | ssize_t err = 0; |
3227e14c | 654 | struct dentry *dentry; |
bd4c625c LT |
655 | size_t isize; |
656 | size_t file_pos = 0; | |
657 | size_t buffer_pos = 0; | |
658 | struct page *page; | |
bd4c625c LT |
659 | __u32 hash = 0; |
660 | ||
661 | if (name == NULL) | |
662 | return -EINVAL; | |
663 | ||
098297b2 JM |
664 | /* |
665 | * We can't have xattrs attached to v1 items since they don't have | |
666 | * generation numbers | |
667 | */ | |
bd4c625c LT |
668 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
669 | return -EOPNOTSUPP; | |
670 | ||
c2bb80b8 JK |
671 | /* |
672 | * priv_root needn't be initialized during mount so allow initial | |
673 | * lookups to succeed. | |
674 | */ | |
675 | if (!REISERFS_SB(inode->i_sb)->priv_root) | |
676 | return 0; | |
677 | ||
48b32a35 | 678 | dentry = xattr_lookup(inode, name, XATTR_REPLACE); |
3227e14c JM |
679 | if (IS_ERR(dentry)) { |
680 | err = PTR_ERR(dentry); | |
bd4c625c LT |
681 | goto out; |
682 | } | |
683 | ||
8b6dd72a | 684 | down_read(&REISERFS_I(inode)->i_xattr_sem); |
d984561b | 685 | |
2b0143b5 | 686 | isize = i_size_read(d_inode(dentry)); |
bd4c625c LT |
687 | |
688 | /* Just return the size needed */ | |
689 | if (buffer == NULL) { | |
690 | err = isize - sizeof(struct reiserfs_xattr_header); | |
8b6dd72a | 691 | goto out_unlock; |
bd4c625c LT |
692 | } |
693 | ||
694 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { | |
695 | err = -ERANGE; | |
8b6dd72a | 696 | goto out_unlock; |
bd4c625c LT |
697 | } |
698 | ||
699 | while (file_pos < isize) { | |
700 | size_t chunk; | |
701 | char *data; | |
702 | size_t skip = 0; | |
f3fb9e27 | 703 | |
09cbfeaf KS |
704 | if (isize - file_pos > PAGE_SIZE) |
705 | chunk = PAGE_SIZE; | |
bd4c625c LT |
706 | else |
707 | chunk = isize - file_pos; | |
708 | ||
2b0143b5 | 709 | page = reiserfs_get_page(d_inode(dentry), file_pos); |
bd4c625c LT |
710 | if (IS_ERR(page)) { |
711 | err = PTR_ERR(page); | |
8b6dd72a | 712 | goto out_unlock; |
bd4c625c LT |
713 | } |
714 | ||
715 | lock_page(page); | |
716 | data = page_address(page); | |
717 | if (file_pos == 0) { | |
718 | struct reiserfs_xattr_header *rxh = | |
719 | (struct reiserfs_xattr_header *)data; | |
720 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
721 | chunk -= skip; | |
722 | /* Magic doesn't match up.. */ | |
723 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { | |
724 | unlock_page(page); | |
725 | reiserfs_put_page(page); | |
a72bdb1c | 726 | reiserfs_warning(inode->i_sb, "jdm-20001", |
bd4c625c LT |
727 | "Invalid magic for xattr (%s) " |
728 | "associated with %k", name, | |
729 | INODE_PKEY(inode)); | |
730 | err = -EIO; | |
8b6dd72a | 731 | goto out_unlock; |
bd4c625c LT |
732 | } |
733 | hash = le32_to_cpu(rxh->h_hash); | |
734 | } | |
735 | memcpy(buffer + buffer_pos, data + skip, chunk); | |
736 | unlock_page(page); | |
737 | reiserfs_put_page(page); | |
738 | file_pos += chunk; | |
739 | buffer_pos += chunk; | |
740 | skip = 0; | |
741 | } | |
742 | err = isize - sizeof(struct reiserfs_xattr_header); | |
743 | ||
744 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != | |
745 | hash) { | |
a72bdb1c | 746 | reiserfs_warning(inode->i_sb, "jdm-20002", |
bd4c625c LT |
747 | "Invalid hash for xattr (%s) associated " |
748 | "with %k", name, INODE_PKEY(inode)); | |
749 | err = -EIO; | |
750 | } | |
751 | ||
8b6dd72a JM |
752 | out_unlock: |
753 | up_read(&REISERFS_I(inode)->i_xattr_sem); | |
3227e14c | 754 | dput(dentry); |
bd4c625c | 755 | |
a72bdb1c | 756 | out: |
bd4c625c | 757 | return err; |
1da177e4 LT |
758 | } |
759 | ||
48b32a35 JM |
760 | /* |
761 | * In order to implement different sets of xattr operations for each xattr | |
762 | * prefix with the generic xattr API, a filesystem should create a | |
763 | * null-terminated array of struct xattr_handler (one for each prefix) and | |
764 | * hang a pointer to it off of the s_xattr field of the superblock. | |
765 | * | |
766 | * The generic_fooxattr() functions will use this list to dispatch xattr | |
767 | * operations to the correct xattr_handler. | |
768 | */ | |
769 | #define for_each_xattr_handler(handlers, handler) \ | |
770 | for ((handler) = *(handlers)++; \ | |
771 | (handler) != NULL; \ | |
772 | (handler) = *(handlers)++) | |
1da177e4 | 773 | |
387b96a5 CB |
774 | static inline bool reiserfs_posix_acl_list(const char *name, |
775 | struct dentry *dentry) | |
776 | { | |
777 | return (posix_acl_type(name) >= 0) && | |
778 | IS_POSIXACL(d_backing_inode(dentry)); | |
779 | } | |
780 | ||
48b32a35 | 781 | /* This is the implementation for the xattr plugin infrastructure */ |
387b96a5 CB |
782 | static inline bool reiserfs_xattr_list(const struct xattr_handler **handlers, |
783 | const char *name, struct dentry *dentry) | |
1da177e4 | 784 | { |
387b96a5 CB |
785 | if (handlers) { |
786 | const struct xattr_handler *xah = NULL; | |
bd4c625c | 787 | |
387b96a5 CB |
788 | for_each_xattr_handler(handlers, xah) { |
789 | const char *prefix = xattr_prefix(xah); | |
bd4c625c | 790 | |
387b96a5 CB |
791 | if (strncmp(prefix, name, strlen(prefix))) |
792 | continue; | |
793 | ||
794 | if (!xattr_handler_can_list(xah, dentry)) | |
795 | return false; | |
796 | ||
797 | return true; | |
798 | } | |
bd4c625c LT |
799 | } |
800 | ||
387b96a5 | 801 | return reiserfs_posix_acl_list(name, dentry); |
bd4c625c | 802 | } |
1da177e4 | 803 | |
48b32a35 | 804 | struct listxattr_buf { |
4acf381e | 805 | struct dir_context ctx; |
48b32a35 JM |
806 | size_t size; |
807 | size_t pos; | |
808 | char *buf; | |
431547b3 | 809 | struct dentry *dentry; |
1da177e4 LT |
810 | }; |
811 | ||
25885a35 | 812 | static bool listxattr_filler(struct dir_context *ctx, const char *name, |
ac7576f4 MS |
813 | int namelen, loff_t offset, u64 ino, |
814 | unsigned int d_type) | |
1da177e4 | 815 | { |
ac7576f4 MS |
816 | struct listxattr_buf *b = |
817 | container_of(ctx, struct listxattr_buf, ctx); | |
48b32a35 | 818 | size_t size; |
f3fb9e27 | 819 | |
48b32a35 JM |
820 | if (name[0] != '.' || |
821 | (namelen != 1 && (name[1] != '.' || namelen != 2))) { | |
387b96a5 CB |
822 | if (!reiserfs_xattr_list(b->dentry->d_sb->s_xattr, name, |
823 | b->dentry)) | |
25885a35 | 824 | return true; |
764a5c6b | 825 | size = namelen + 1; |
48b32a35 | 826 | if (b->buf) { |
a13f085d JH |
827 | if (b->pos + size > b->size) { |
828 | b->pos = -ERANGE; | |
25885a35 | 829 | return false; |
a13f085d | 830 | } |
764a5c6b AG |
831 | memcpy(b->buf + b->pos, name, namelen); |
832 | b->buf[b->pos + namelen] = 0; | |
bd4c625c | 833 | } |
48b32a35 JM |
834 | b->pos += size; |
835 | } | |
25885a35 | 836 | return true; |
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 | 856 | |
2b0143b5 | 857 | if (d_really_is_negative(dentry)) |
bd4c625c LT |
858 | return -EINVAL; |
859 | ||
60e4cf67 | 860 | if (get_inode_sd_version(d_inode(dentry)) == STAT_DATA_V1) |
bd4c625c LT |
861 | return -EOPNOTSUPP; |
862 | ||
2b0143b5 | 863 | dir = open_xa_dir(d_inode(dentry), XATTR_REPLACE); |
bd4c625c LT |
864 | if (IS_ERR(dir)) { |
865 | err = PTR_ERR(dir); | |
866 | if (err == -ENODATA) | |
48b32a35 | 867 | err = 0; /* Not an error if there aren't any xattrs */ |
bd4c625c LT |
868 | goto out; |
869 | } | |
870 | ||
5955102c | 871 | inode_lock_nested(d_inode(dir), I_MUTEX_XATTR); |
2b0143b5 | 872 | err = reiserfs_readdir_inode(d_inode(dir), &buf.ctx); |
5955102c | 873 | inode_unlock(d_inode(dir)); |
bd4c625c | 874 | |
48b32a35 JM |
875 | if (!err) |
876 | err = buf.pos; | |
bd4c625c | 877 | |
3227e14c | 878 | dput(dir); |
8b6dd72a | 879 | out: |
bd4c625c | 880 | return err; |
1da177e4 LT |
881 | } |
882 | ||
a72bdb1c | 883 | static int create_privroot(struct dentry *dentry) |
1da177e4 | 884 | { |
a72bdb1c | 885 | int err; |
2b0143b5 | 886 | struct inode *inode = d_inode(dentry->d_parent); |
f3fb9e27 | 887 | |
5955102c | 888 | WARN_ON_ONCE(!inode_is_locked(inode)); |
5a6059c3 | 889 | |
6c17675e | 890 | err = xattr_mkdir(inode, dentry, 0700); |
2b0143b5 | 891 | if (err || d_really_is_negative(dentry)) { |
edcc37a0 AV |
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 | ||
d9f892b9 | 899 | reiserfs_init_priv_inode(d_inode(dentry)); |
edcc37a0 AV |
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 */ | |
60e4cf67 | 913 | 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, | |
12abb35a JM |
920 | #endif |
921 | NULL | |
922 | }; | |
923 | ||
a72bdb1c | 924 | static int xattr_mount_check(struct super_block *s) |
1da177e4 | 925 | { |
098297b2 JM |
926 | /* |
927 | * We need generation numbers to ensure that the oid mapping is correct | |
928 | * v3.5 filesystems don't have them. | |
929 | */ | |
48b32a35 JM |
930 | if (old_format_only(s)) { |
931 | if (reiserfs_xattrs_optional(s)) { | |
098297b2 JM |
932 | /* |
933 | * Old format filesystem, but optional xattrs have | |
934 | * been enabled. Error out. | |
935 | */ | |
48b32a35 JM |
936 | reiserfs_warning(s, "jdm-2005", |
937 | "xattrs/ACLs not supported " | |
938 | "on pre-v3.6 format filesystems. " | |
939 | "Failing mount."); | |
940 | return -EOPNOTSUPP; | |
941 | } | |
a72bdb1c JM |
942 | } |
943 | ||
944 | return 0; | |
1da177e4 LT |
945 | } |
946 | ||
4609e1f1 | 947 | int reiserfs_permission(struct mnt_idmap *idmap, struct inode *inode, |
549c7297 | 948 | int mask) |
b83674c0 JM |
949 | { |
950 | /* | |
951 | * We don't do permission checks on the internal objects. | |
952 | * Permissions are determined by the "owning" object. | |
953 | */ | |
954 | if (IS_PRIVATE(inode)) | |
955 | return 0; | |
956 | ||
4609e1f1 | 957 | return generic_permission(&nop_mnt_idmap, inode, mask); |
b83674c0 JM |
958 | } |
959 | ||
0b728e19 | 960 | static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 961 | { |
cac36f70 | 962 | return -EPERM; |
1da177e4 LT |
963 | } |
964 | ||
e16404ed | 965 | static const struct dentry_operations xattr_lookup_poison_ops = { |
cac36f70 | 966 | .d_revalidate = xattr_hide_revalidate, |
1da177e4 LT |
967 | }; |
968 | ||
edcc37a0 AV |
969 | int reiserfs_lookup_privroot(struct super_block *s) |
970 | { | |
971 | struct dentry *dentry; | |
972 | int err = 0; | |
973 | ||
974 | /* If we don't have the privroot located yet - go find it */ | |
5955102c | 975 | inode_lock(d_inode(s->s_root)); |
edcc37a0 AV |
976 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, |
977 | strlen(PRIVROOT_NAME)); | |
978 | if (!IS_ERR(dentry)) { | |
979 | REISERFS_SB(s)->priv_root = dentry; | |
fb045adb | 980 | d_set_d_op(dentry, &xattr_lookup_poison_ops); |
d9f892b9 CB |
981 | if (d_really_is_positive(dentry)) |
982 | reiserfs_init_priv_inode(d_inode(dentry)); | |
edcc37a0 AV |
983 | } else |
984 | err = PTR_ERR(dentry); | |
5955102c | 985 | inode_unlock(d_inode(s->s_root)); |
edcc37a0 AV |
986 | |
987 | return err; | |
988 | } | |
989 | ||
098297b2 JM |
990 | /* |
991 | * We need to take a copy of the mount flags since things like | |
1751e8a6 | 992 | * SB_RDONLY don't get set until *after* we're called. |
098297b2 JM |
993 | * mount_flags != mount_options |
994 | */ | |
bd4c625c | 995 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
1da177e4 | 996 | { |
bd4c625c | 997 | int err = 0; |
ab17c4f0 | 998 | struct dentry *privroot = REISERFS_SB(s)->priv_root; |
bd4c625c | 999 | |
a72bdb1c JM |
1000 | err = xattr_mount_check(s); |
1001 | if (err) | |
bd4c625c | 1002 | goto error; |
bd4c625c | 1003 | |
1751e8a6 | 1004 | if (d_really_is_negative(privroot) && !(mount_flags & SB_RDONLY)) { |
5955102c | 1005 | inode_lock(d_inode(s->s_root)); |
edcc37a0 | 1006 | err = create_privroot(REISERFS_SB(s)->priv_root); |
5955102c | 1007 | inode_unlock(d_inode(s->s_root)); |
bd4c625c | 1008 | } |
ab17c4f0 | 1009 | |
2b0143b5 | 1010 | if (d_really_is_positive(privroot)) { |
5955102c | 1011 | inode_lock(d_inode(privroot)); |
ab17c4f0 JM |
1012 | if (!REISERFS_SB(s)->xattr_root) { |
1013 | struct dentry *dentry; | |
f3fb9e27 | 1014 | |
ab17c4f0 JM |
1015 | dentry = lookup_one_len(XAROOT_NAME, privroot, |
1016 | strlen(XAROOT_NAME)); | |
1017 | if (!IS_ERR(dentry)) | |
1018 | REISERFS_SB(s)->xattr_root = dentry; | |
1019 | else | |
1020 | err = PTR_ERR(dentry); | |
1021 | } | |
5955102c | 1022 | inode_unlock(d_inode(privroot)); |
ab17c4f0 | 1023 | } |
48b32a35 | 1024 | |
a72bdb1c | 1025 | error: |
bd4c625c | 1026 | if (err) { |
a228bf8f JM |
1027 | clear_bit(REISERFS_XATTRS_USER, &REISERFS_SB(s)->s_mount_opt); |
1028 | clear_bit(REISERFS_POSIXACL, &REISERFS_SB(s)->s_mount_opt); | |
bd4c625c LT |
1029 | } |
1030 | ||
1751e8a6 | 1031 | /* The super_block SB_POSIXACL must mirror the (no)acl mount option. */ |
bd4c625c | 1032 | if (reiserfs_posixacl(s)) |
1751e8a6 | 1033 | s->s_flags |= SB_POSIXACL; |
ab17c4f0 | 1034 | else |
1751e8a6 | 1035 | s->s_flags &= ~SB_POSIXACL; |
bd4c625c LT |
1036 | |
1037 | return err; | |
1da177e4 | 1038 | } |