Commit | Line | Data |
---|---|---|
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> |
1da177e4 | 55 | |
1da177e4 LT |
56 | #define PRIVROOT_NAME ".reiserfs_priv" |
57 | #define XAROOT_NAME "xattrs" | |
58 | ||
1da177e4 | 59 | |
098297b2 JM |
60 | /* |
61 | * Helpers for inode ops. We do this so that we don't have all the VFS | |
6c17675e | 62 | * overhead and also for proper i_mutex annotation. |
098297b2 JM |
63 | * dir->i_mutex must be held for all of them. |
64 | */ | |
3a355cc6 | 65 | #ifdef CONFIG_REISERFS_FS_XATTR |
6c17675e | 66 | static int xattr_create(struct inode *dir, struct dentry *dentry, int mode) |
1da177e4 | 67 | { |
5955102c | 68 | BUG_ON(!inode_is_locked(dir)); |
549c7297 | 69 | return dir->i_op->create(&init_user_ns, dir, dentry, mode, true); |
6c17675e | 70 | } |
3a355cc6 | 71 | #endif |
bd4c625c | 72 | |
18bb1db3 | 73 | static int xattr_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
6c17675e | 74 | { |
5955102c | 75 | BUG_ON(!inode_is_locked(dir)); |
549c7297 | 76 | return dir->i_op->mkdir(&init_user_ns, dir, dentry, mode); |
6c17675e | 77 | } |
bd4c625c | 78 | |
098297b2 JM |
79 | /* |
80 | * We use I_MUTEX_CHILD here to silence lockdep. It's safe because xattr | |
6c17675e JM |
81 | * mutation ops aren't called during rename or splace, which are the |
82 | * only other users of I_MUTEX_CHILD. It violates the ordering, but that's | |
098297b2 JM |
83 | * better than allocating another subclass just for this code. |
84 | */ | |
6c17675e JM |
85 | static int xattr_unlink(struct inode *dir, struct dentry *dentry) |
86 | { | |
87 | int error; | |
f3fb9e27 | 88 | |
5955102c | 89 | BUG_ON(!inode_is_locked(dir)); |
bd4c625c | 90 | |
5955102c | 91 | inode_lock_nested(d_inode(dentry), I_MUTEX_CHILD); |
6c17675e | 92 | error = dir->i_op->unlink(dir, dentry); |
5955102c | 93 | inode_unlock(d_inode(dentry)); |
6c17675e JM |
94 | |
95 | if (!error) | |
96 | d_delete(dentry); | |
97 | return error; | |
98 | } | |
99 | ||
100 | static int xattr_rmdir(struct inode *dir, struct dentry *dentry) | |
101 | { | |
102 | int error; | |
f3fb9e27 | 103 | |
5955102c | 104 | BUG_ON(!inode_is_locked(dir)); |
6c17675e | 105 | |
5955102c | 106 | inode_lock_nested(d_inode(dentry), I_MUTEX_CHILD); |
6c17675e JM |
107 | error = dir->i_op->rmdir(dir, dentry); |
108 | if (!error) | |
2b0143b5 | 109 | d_inode(dentry)->i_flags |= S_DEAD; |
5955102c | 110 | inode_unlock(d_inode(dentry)); |
6c17675e JM |
111 | if (!error) |
112 | d_delete(dentry); | |
6c17675e JM |
113 | |
114 | return error; | |
115 | } | |
116 | ||
6c17675e JM |
117 | #define xattr_may_create(flags) (!flags || flags & XATTR_CREATE) |
118 | ||
ab17c4f0 | 119 | static struct dentry *open_xa_root(struct super_block *sb, int flags) |
6c17675e | 120 | { |
ab17c4f0 JM |
121 | struct dentry *privroot = REISERFS_SB(sb)->priv_root; |
122 | struct dentry *xaroot; | |
f3fb9e27 | 123 | |
2b0143b5 | 124 | if (d_really_is_negative(privroot)) |
60e4cf67 | 125 | return ERR_PTR(-EOPNOTSUPP); |
6c17675e | 126 | |
5955102c | 127 | inode_lock_nested(d_inode(privroot), I_MUTEX_XATTR); |
6c17675e | 128 | |
ab17c4f0 | 129 | xaroot = dget(REISERFS_SB(sb)->xattr_root); |
ceb5edc4 | 130 | if (!xaroot) |
60e4cf67 | 131 | xaroot = ERR_PTR(-EOPNOTSUPP); |
2b0143b5 | 132 | else if (d_really_is_negative(xaroot)) { |
ab17c4f0 | 133 | int err = -ENODATA; |
f3fb9e27 | 134 | |
5a6059c3 | 135 | if (xattr_may_create(flags)) |
2b0143b5 | 136 | err = xattr_mkdir(d_inode(privroot), xaroot, 0700); |
9b7f3755 | 137 | if (err) { |
ab17c4f0 JM |
138 | dput(xaroot); |
139 | xaroot = ERR_PTR(err); | |
9b7f3755 | 140 | } |
bd4c625c | 141 | } |
6c17675e | 142 | |
5955102c | 143 | inode_unlock(d_inode(privroot)); |
ab17c4f0 | 144 | return xaroot; |
1da177e4 LT |
145 | } |
146 | ||
bd4c625c | 147 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
1da177e4 | 148 | { |
bd4c625c LT |
149 | struct dentry *xaroot, *xadir; |
150 | char namebuf[17]; | |
151 | ||
6c17675e | 152 | xaroot = open_xa_root(inode->i_sb, flags); |
9b7f3755 | 153 | if (IS_ERR(xaroot)) |
bd4c625c | 154 | return xaroot; |
bd4c625c | 155 | |
bd4c625c LT |
156 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
157 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), | |
158 | inode->i_generation); | |
bd4c625c | 159 | |
5955102c | 160 | inode_lock_nested(d_inode(xaroot), I_MUTEX_XATTR); |
ab17c4f0 JM |
161 | |
162 | xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf)); | |
2b0143b5 | 163 | if (!IS_ERR(xadir) && d_really_is_negative(xadir)) { |
ab17c4f0 | 164 | int err = -ENODATA; |
f3fb9e27 | 165 | |
ab17c4f0 | 166 | if (xattr_may_create(flags)) |
2b0143b5 | 167 | err = xattr_mkdir(d_inode(xaroot), xadir, 0700); |
ab17c4f0 JM |
168 | if (err) { |
169 | dput(xadir); | |
170 | xadir = ERR_PTR(err); | |
171 | } | |
172 | } | |
173 | ||
5955102c | 174 | inode_unlock(d_inode(xaroot)); |
bd4c625c LT |
175 | dput(xaroot); |
176 | return xadir; | |
1da177e4 LT |
177 | } |
178 | ||
098297b2 JM |
179 | /* |
180 | * The following are side effects of other operations that aren't explicitly | |
48b32a35 | 181 | * modifying extended attributes. This includes operations such as permissions |
098297b2 JM |
182 | * or ownership changes, object deletions, etc. |
183 | */ | |
a41f1a47 | 184 | struct reiserfs_dentry_buf { |
4acf381e | 185 | struct dir_context ctx; |
a41f1a47 JM |
186 | struct dentry *xadir; |
187 | int count; | |
b10298d5 | 188 | int err; |
a41f1a47 JM |
189 | struct dentry *dentries[8]; |
190 | }; | |
bd4c625c | 191 | |
a72bdb1c | 192 | static int |
ac7576f4 MS |
193 | fill_with_dentries(struct dir_context *ctx, const char *name, int namelen, |
194 | loff_t offset, u64 ino, unsigned int d_type) | |
a72bdb1c | 195 | { |
ac7576f4 MS |
196 | struct reiserfs_dentry_buf *dbuf = |
197 | container_of(ctx, struct reiserfs_dentry_buf, ctx); | |
a72bdb1c | 198 | struct dentry *dentry; |
f3fb9e27 | 199 | |
5955102c | 200 | WARN_ON_ONCE(!inode_is_locked(d_inode(dbuf->xadir))); |
bd4c625c | 201 | |
a41f1a47 JM |
202 | if (dbuf->count == ARRAY_SIZE(dbuf->dentries)) |
203 | return -ENOSPC; | |
bd4c625c | 204 | |
35e5cbc0 JK |
205 | if (name[0] == '.' && (namelen < 2 || |
206 | (namelen == 2 && name[1] == '.'))) | |
a41f1a47 | 207 | return 0; |
bd4c625c | 208 | |
a41f1a47 | 209 | dentry = lookup_one_len(name, dbuf->xadir, namelen); |
a72bdb1c | 210 | if (IS_ERR(dentry)) { |
b10298d5 | 211 | dbuf->err = PTR_ERR(dentry); |
a41f1a47 | 212 | return PTR_ERR(dentry); |
2b0143b5 | 213 | } else if (d_really_is_negative(dentry)) { |
a41f1a47 JM |
214 | /* A directory entry exists, but no file? */ |
215 | reiserfs_error(dentry->d_sb, "xattr-20003", | |
a455589f AV |
216 | "Corrupted directory: xattr %pd listed but " |
217 | "not found for file %pd.\n", | |
218 | dentry, dbuf->xadir); | |
a41f1a47 | 219 | dput(dentry); |
b10298d5 | 220 | dbuf->err = -EIO; |
a41f1a47 | 221 | return -EIO; |
bd4c625c | 222 | } |
1da177e4 | 223 | |
a41f1a47 JM |
224 | dbuf->dentries[dbuf->count++] = dentry; |
225 | return 0; | |
1da177e4 LT |
226 | } |
227 | ||
a41f1a47 JM |
228 | static void |
229 | cleanup_dentry_buf(struct reiserfs_dentry_buf *buf) | |
1da177e4 | 230 | { |
a41f1a47 | 231 | int i; |
f3fb9e27 | 232 | |
a41f1a47 JM |
233 | for (i = 0; i < buf->count; i++) |
234 | if (buf->dentries[i]) | |
235 | dput(buf->dentries[i]); | |
a72bdb1c JM |
236 | } |
237 | ||
a41f1a47 JM |
238 | static int reiserfs_for_each_xattr(struct inode *inode, |
239 | int (*action)(struct dentry *, void *), | |
240 | void *data) | |
a72bdb1c | 241 | { |
a41f1a47 JM |
242 | struct dentry *dir; |
243 | int i, err = 0; | |
a41f1a47 | 244 | struct reiserfs_dentry_buf buf = { |
4acf381e | 245 | .ctx.actor = fill_with_dentries, |
a41f1a47 | 246 | }; |
1da177e4 | 247 | |
a72bdb1c JM |
248 | /* Skip out, an xattr has no xattrs associated with it */ |
249 | if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1) | |
250 | return 0; | |
1da177e4 | 251 | |
6c17675e | 252 | dir = open_xa_dir(inode, XATTR_REPLACE); |
a72bdb1c JM |
253 | if (IS_ERR(dir)) { |
254 | err = PTR_ERR(dir); | |
255 | goto out; | |
2b0143b5 | 256 | } else if (d_really_is_negative(dir)) { |
a41f1a47 JM |
257 | err = 0; |
258 | goto out_dir; | |
a72bdb1c | 259 | } |
1da177e4 | 260 | |
5955102c | 261 | inode_lock_nested(d_inode(dir), I_MUTEX_XATTR); |
27026a05 | 262 | |
a41f1a47 | 263 | buf.xadir = dir; |
cd62cdae | 264 | while (1) { |
2b0143b5 | 265 | err = reiserfs_readdir_inode(d_inode(dir), &buf.ctx); |
cd62cdae AV |
266 | if (err) |
267 | break; | |
b10298d5 JH |
268 | if (buf.err) { |
269 | err = buf.err; | |
270 | break; | |
271 | } | |
cd62cdae AV |
272 | if (!buf.count) |
273 | break; | |
274 | for (i = 0; !err && i < buf.count && buf.dentries[i]; i++) { | |
a41f1a47 | 275 | struct dentry *dentry = buf.dentries[i]; |
1da177e4 | 276 | |
e36cb0b8 | 277 | if (!d_is_dir(dentry)) |
cd62cdae | 278 | err = action(dentry, data); |
1da177e4 | 279 | |
a41f1a47 JM |
280 | dput(dentry); |
281 | buf.dentries[i] = NULL; | |
bd4c625c | 282 | } |
cd62cdae AV |
283 | if (err) |
284 | break; | |
a41f1a47 | 285 | buf.count = 0; |
8b6dd72a | 286 | } |
5955102c | 287 | inode_unlock(d_inode(dir)); |
1da177e4 | 288 | |
a41f1a47 | 289 | cleanup_dentry_buf(&buf); |
1da177e4 | 290 | |
d984561b | 291 | if (!err) { |
098297b2 JM |
292 | /* |
293 | * We start a transaction here to avoid a ABBA situation | |
a41f1a47 JM |
294 | * between the xattr root's i_mutex and the journal lock. |
295 | * This doesn't incur much additional overhead since the | |
296 | * new transaction will just nest inside the | |
098297b2 JM |
297 | * outer transaction. |
298 | */ | |
a41f1a47 JM |
299 | int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + |
300 | 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); | |
301 | struct reiserfs_transaction_handle th; | |
f3fb9e27 | 302 | |
4c05141d | 303 | reiserfs_write_lock(inode->i_sb); |
a41f1a47 | 304 | err = journal_begin(&th, inode->i_sb, blocks); |
4c05141d | 305 | reiserfs_write_unlock(inode->i_sb); |
a41f1a47 JM |
306 | if (!err) { |
307 | int jerror; | |
f3fb9e27 | 308 | |
5955102c | 309 | inode_lock_nested(d_inode(dir->d_parent), |
4c05141d | 310 | I_MUTEX_XATTR); |
a41f1a47 | 311 | err = action(dir, data); |
4c05141d | 312 | reiserfs_write_lock(inode->i_sb); |
58d85426 | 313 | jerror = journal_end(&th); |
4c05141d | 314 | reiserfs_write_unlock(inode->i_sb); |
5955102c | 315 | inode_unlock(d_inode(dir->d_parent)); |
a41f1a47 JM |
316 | err = jerror ?: err; |
317 | } | |
a72bdb1c | 318 | } |
a41f1a47 JM |
319 | out_dir: |
320 | dput(dir); | |
a72bdb1c | 321 | out: |
394440d4 JM |
322 | /* |
323 | * -ENODATA: this object doesn't have any xattrs | |
324 | * -EOPNOTSUPP: this file system doesn't have xattrs enabled on disk. | |
325 | * Neither are errors | |
326 | */ | |
327 | if (err == -ENODATA || err == -EOPNOTSUPP) | |
a41f1a47 | 328 | err = 0; |
a72bdb1c JM |
329 | return err; |
330 | } | |
1da177e4 | 331 | |
a41f1a47 | 332 | static int delete_one_xattr(struct dentry *dentry, void *data) |
a72bdb1c | 333 | { |
2b0143b5 | 334 | struct inode *dir = d_inode(dentry->d_parent); |
1da177e4 | 335 | |
a41f1a47 | 336 | /* This is the xattr dir, handle specially. */ |
e36cb0b8 | 337 | if (d_is_dir(dentry)) |
a41f1a47 | 338 | return xattr_rmdir(dir, dentry); |
1da177e4 | 339 | |
a41f1a47 JM |
340 | return xattr_unlink(dir, dentry); |
341 | } | |
bd4c625c | 342 | |
a41f1a47 JM |
343 | static int chown_one_xattr(struct dentry *dentry, void *data) |
344 | { | |
345 | struct iattr *attrs = data; | |
4a857011 JM |
346 | int ia_valid = attrs->ia_valid; |
347 | int err; | |
348 | ||
349 | /* | |
350 | * We only want the ownership bits. Otherwise, we'll do | |
351 | * things like change a directory to a regular file if | |
352 | * ATTR_MODE is set. | |
353 | */ | |
354 | attrs->ia_valid &= (ATTR_UID|ATTR_GID); | |
549c7297 | 355 | err = reiserfs_setattr(&init_user_ns, dentry, attrs); |
4a857011 JM |
356 | attrs->ia_valid = ia_valid; |
357 | ||
358 | return err; | |
a41f1a47 | 359 | } |
1da177e4 | 360 | |
a41f1a47 JM |
361 | /* No i_mutex, but the inode is unconnected. */ |
362 | int reiserfs_delete_xattrs(struct inode *inode) | |
363 | { | |
364 | int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); | |
f3fb9e27 | 365 | |
a41f1a47 JM |
366 | if (err) |
367 | reiserfs_warning(inode->i_sb, "jdm-20004", | |
368 | "Couldn't delete all xattrs (%d)\n", err); | |
a72bdb1c JM |
369 | return err; |
370 | } | |
1da177e4 | 371 | |
a41f1a47 | 372 | /* inode->i_mutex: down */ |
a72bdb1c JM |
373 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
374 | { | |
a41f1a47 | 375 | int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); |
f3fb9e27 | 376 | |
8b6dd72a JM |
377 | if (err) |
378 | reiserfs_warning(inode->i_sb, "jdm-20007", | |
379 | "Couldn't chown all xattrs (%d)\n", err); | |
a72bdb1c | 380 | return err; |
1da177e4 LT |
381 | } |
382 | ||
a72bdb1c | 383 | #ifdef CONFIG_REISERFS_FS_XATTR |
098297b2 JM |
384 | /* |
385 | * Returns a dentry corresponding to a specific extended attribute file | |
a72bdb1c | 386 | * for the inode. If flags allow, the file is created. Otherwise, a |
098297b2 JM |
387 | * valid or negative dentry, or an error is returned. |
388 | */ | |
48b32a35 JM |
389 | static struct dentry *xattr_lookup(struct inode *inode, const char *name, |
390 | int flags) | |
1da177e4 | 391 | { |
a72bdb1c JM |
392 | struct dentry *xadir, *xafile; |
393 | int err = 0; | |
394 | ||
395 | xadir = open_xa_dir(inode, flags); | |
6c17675e | 396 | if (IS_ERR(xadir)) |
a72bdb1c | 397 | return ERR_CAST(xadir); |
a72bdb1c | 398 | |
5955102c | 399 | inode_lock_nested(d_inode(xadir), I_MUTEX_XATTR); |
a72bdb1c JM |
400 | xafile = lookup_one_len(name, xadir, strlen(name)); |
401 | if (IS_ERR(xafile)) { | |
6c17675e JM |
402 | err = PTR_ERR(xafile); |
403 | goto out; | |
bd4c625c | 404 | } |
a72bdb1c | 405 | |
2b0143b5 | 406 | if (d_really_is_positive(xafile) && (flags & XATTR_CREATE)) |
6c17675e | 407 | err = -EEXIST; |
a72bdb1c | 408 | |
2b0143b5 | 409 | if (d_really_is_negative(xafile)) { |
6c17675e | 410 | err = -ENODATA; |
5a6059c3 | 411 | if (xattr_may_create(flags)) |
2b0143b5 | 412 | err = xattr_create(d_inode(xadir), xafile, |
6c17675e | 413 | 0700|S_IFREG); |
a72bdb1c JM |
414 | } |
415 | ||
6c17675e JM |
416 | if (err) |
417 | dput(xafile); | |
a72bdb1c | 418 | out: |
5955102c | 419 | inode_unlock(d_inode(xadir)); |
a72bdb1c JM |
420 | dput(xadir); |
421 | if (err) | |
6c17675e | 422 | return ERR_PTR(err); |
a72bdb1c | 423 | return xafile; |
1da177e4 LT |
424 | } |
425 | ||
1da177e4 | 426 | /* Internal operations on file data */ |
bd4c625c | 427 | static inline void reiserfs_put_page(struct page *page) |
1da177e4 | 428 | { |
bd4c625c | 429 | kunmap(page); |
09cbfeaf | 430 | put_page(page); |
1da177e4 LT |
431 | } |
432 | ||
ec6ea56b | 433 | static struct page *reiserfs_get_page(struct inode *dir, size_t n) |
1da177e4 | 434 | { |
bd4c625c LT |
435 | struct address_space *mapping = dir->i_mapping; |
436 | struct page *page; | |
098297b2 JM |
437 | /* |
438 | * We can deadlock if we try to free dentries, | |
439 | * and an unlink/rmdir has just occurred - GFP_NOFS avoids this | |
440 | */ | |
c4cdd038 | 441 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
09cbfeaf | 442 | page = read_mapping_page(mapping, n >> PAGE_SHIFT, NULL); |
bd4c625c | 443 | if (!IS_ERR(page)) { |
bd4c625c | 444 | kmap(page); |
bd4c625c LT |
445 | if (PageError(page)) |
446 | goto fail; | |
447 | } | |
448 | return page; | |
449 | ||
cf776a7a | 450 | fail: |
bd4c625c LT |
451 | reiserfs_put_page(page); |
452 | return ERR_PTR(-EIO); | |
1da177e4 LT |
453 | } |
454 | ||
bd4c625c | 455 | static inline __u32 xattr_hash(const char *msg, int len) |
1da177e4 | 456 | { |
672cdd56 BV |
457 | /* |
458 | * csum_partial() gives different results for little-endian and | |
459 | * big endian hosts. Images created on little-endian hosts and | |
460 | * mounted on big-endian hosts(and vice versa) will see csum mismatches | |
461 | * when trying to fetch xattrs. Treating the hash as __wsum_t would | |
462 | * lower the frequency of mismatch. This is an endianness bug in | |
463 | * reiserfs. The return statement would result in a sparse warning. Do | |
464 | * not fix the sparse warning so as to not hide a reminder of the bug. | |
465 | */ | |
bd4c625c | 466 | return csum_partial(msg, len, 0); |
1da177e4 LT |
467 | } |
468 | ||
ba9d8cec VS |
469 | int reiserfs_commit_write(struct file *f, struct page *page, |
470 | unsigned from, unsigned to); | |
ba9d8cec | 471 | |
48b32a35 JM |
472 | static void update_ctime(struct inode *inode) |
473 | { | |
95582b00 | 474 | struct timespec64 now = current_time(inode); |
f3fb9e27 | 475 | |
1d3382cb | 476 | if (inode_unhashed(inode) || !inode->i_nlink || |
95582b00 | 477 | timespec64_equal(&inode->i_ctime, &now)) |
48b32a35 JM |
478 | return; |
479 | ||
02027d42 | 480 | inode->i_ctime = current_time(inode); |
48b32a35 JM |
481 | mark_inode_dirty(inode); |
482 | } | |
483 | ||
484 | static int lookup_and_delete_xattr(struct inode *inode, const char *name) | |
485 | { | |
486 | int err = 0; | |
487 | struct dentry *dentry, *xadir; | |
488 | ||
489 | xadir = open_xa_dir(inode, XATTR_REPLACE); | |
490 | if (IS_ERR(xadir)) | |
491 | return PTR_ERR(xadir); | |
492 | ||
5955102c | 493 | inode_lock_nested(d_inode(xadir), I_MUTEX_XATTR); |
48b32a35 JM |
494 | dentry = lookup_one_len(name, xadir, strlen(name)); |
495 | if (IS_ERR(dentry)) { | |
496 | err = PTR_ERR(dentry); | |
497 | goto out_dput; | |
498 | } | |
499 | ||
2b0143b5 DH |
500 | if (d_really_is_positive(dentry)) { |
501 | err = xattr_unlink(d_inode(xadir), dentry); | |
48b32a35 JM |
502 | update_ctime(inode); |
503 | } | |
504 | ||
505 | dput(dentry); | |
506 | out_dput: | |
5955102c | 507 | inode_unlock(d_inode(xadir)); |
48b32a35 JM |
508 | dput(xadir); |
509 | return err; | |
510 | } | |
511 | ||
ba9d8cec | 512 | |
1da177e4 LT |
513 | /* Generic extended attribute operations that can be used by xa plugins */ |
514 | ||
515 | /* | |
1b1dcc1b | 516 | * inode->i_mutex: down |
1da177e4 LT |
517 | */ |
518 | int | |
0ab2621e JM |
519 | reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, |
520 | struct inode *inode, const char *name, | |
521 | const void *buffer, size_t buffer_size, int flags) | |
1da177e4 | 522 | { |
bd4c625c | 523 | int err = 0; |
3227e14c | 524 | struct dentry *dentry; |
bd4c625c LT |
525 | struct page *page; |
526 | char *data; | |
bd4c625c LT |
527 | size_t file_pos = 0; |
528 | size_t buffer_pos = 0; | |
48b32a35 | 529 | size_t new_size; |
bd4c625c LT |
530 | __u32 xahash = 0; |
531 | ||
bd4c625c LT |
532 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
533 | return -EOPNOTSUPP; | |
534 | ||
4f3be1b5 FW |
535 | if (!buffer) { |
536 | err = lookup_and_delete_xattr(inode, name); | |
4f3be1b5 FW |
537 | return err; |
538 | } | |
539 | ||
48b32a35 | 540 | dentry = xattr_lookup(inode, name, flags); |
4c05141d | 541 | if (IS_ERR(dentry)) |
48b32a35 | 542 | return PTR_ERR(dentry); |
3f14fea6 | 543 | |
f3e22f48 | 544 | down_write(&REISERFS_I(inode)->i_xattr_sem); |
bd4c625c | 545 | |
8b6dd72a | 546 | xahash = xattr_hash(buffer, buffer_size); |
bd4c625c LT |
547 | while (buffer_pos < buffer_size || buffer_pos == 0) { |
548 | size_t chunk; | |
549 | size_t skip = 0; | |
09cbfeaf | 550 | size_t page_offset = (file_pos & (PAGE_SIZE - 1)); |
f3fb9e27 | 551 | |
09cbfeaf KS |
552 | if (buffer_size - buffer_pos > PAGE_SIZE) |
553 | chunk = PAGE_SIZE; | |
bd4c625c LT |
554 | else |
555 | chunk = buffer_size - buffer_pos; | |
556 | ||
2b0143b5 | 557 | page = reiserfs_get_page(d_inode(dentry), file_pos); |
bd4c625c LT |
558 | if (IS_ERR(page)) { |
559 | err = PTR_ERR(page); | |
48b32a35 | 560 | goto out_unlock; |
bd4c625c LT |
561 | } |
562 | ||
563 | lock_page(page); | |
564 | data = page_address(page); | |
565 | ||
566 | if (file_pos == 0) { | |
567 | struct reiserfs_xattr_header *rxh; | |
f3fb9e27 | 568 | |
bd4c625c | 569 | skip = file_pos = sizeof(struct reiserfs_xattr_header); |
09cbfeaf KS |
570 | if (chunk + skip > PAGE_SIZE) |
571 | chunk = PAGE_SIZE - skip; | |
bd4c625c LT |
572 | rxh = (struct reiserfs_xattr_header *)data; |
573 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); | |
574 | rxh->h_hash = cpu_to_le32(xahash); | |
575 | } | |
576 | ||
4c05141d | 577 | reiserfs_write_lock(inode->i_sb); |
ebdec241 | 578 | err = __reiserfs_write_begin(page, page_offset, chunk + skip); |
bd4c625c LT |
579 | if (!err) { |
580 | if (buffer) | |
581 | memcpy(data + skip, buffer + buffer_pos, chunk); | |
3227e14c JM |
582 | err = reiserfs_commit_write(NULL, page, page_offset, |
583 | page_offset + chunk + | |
584 | skip); | |
bd4c625c | 585 | } |
4c05141d | 586 | reiserfs_write_unlock(inode->i_sb); |
bd4c625c LT |
587 | unlock_page(page); |
588 | reiserfs_put_page(page); | |
589 | buffer_pos += chunk; | |
590 | file_pos += chunk; | |
591 | skip = 0; | |
592 | if (err || buffer_size == 0 || !buffer) | |
593 | break; | |
594 | } | |
595 | ||
48b32a35 | 596 | new_size = buffer_size + sizeof(struct reiserfs_xattr_header); |
2b0143b5 | 597 | if (!err && new_size < i_size_read(d_inode(dentry))) { |
48b32a35 | 598 | struct iattr newattrs = { |
02027d42 | 599 | .ia_ctime = current_time(inode), |
fb2162df | 600 | .ia_size = new_size, |
48b32a35 JM |
601 | .ia_valid = ATTR_SIZE | ATTR_CTIME, |
602 | }; | |
31370f62 | 603 | |
5955102c | 604 | inode_lock_nested(d_inode(dentry), I_MUTEX_XATTR); |
2b0143b5 | 605 | inode_dio_wait(d_inode(dentry)); |
31370f62 | 606 | |
549c7297 | 607 | err = reiserfs_setattr(&init_user_ns, dentry, &newattrs); |
5955102c | 608 | inode_unlock(d_inode(dentry)); |
48b32a35 JM |
609 | } else |
610 | update_ctime(inode); | |
611 | out_unlock: | |
8b6dd72a | 612 | up_write(&REISERFS_I(inode)->i_xattr_sem); |
3227e14c | 613 | dput(dentry); |
48b32a35 JM |
614 | return err; |
615 | } | |
bd4c625c | 616 | |
0ab2621e JM |
617 | /* We need to start a transaction to maintain lock ordering */ |
618 | int reiserfs_xattr_set(struct inode *inode, const char *name, | |
619 | const void *buffer, size_t buffer_size, int flags) | |
48b32a35 | 620 | { |
0ab2621e JM |
621 | |
622 | struct reiserfs_transaction_handle th; | |
623 | int error, error2; | |
624 | size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size); | |
625 | ||
60e4cf67 JM |
626 | /* Check before we start a transaction and then do nothing. */ |
627 | if (!d_really_is_positive(REISERFS_SB(inode->i_sb)->priv_root)) | |
628 | return -EOPNOTSUPP; | |
629 | ||
0ab2621e JM |
630 | if (!(flags & XATTR_REPLACE)) |
631 | jbegin_count += reiserfs_xattr_jcreate_nblocks(inode); | |
632 | ||
633 | reiserfs_write_lock(inode->i_sb); | |
634 | error = journal_begin(&th, inode->i_sb, jbegin_count); | |
4c05141d | 635 | reiserfs_write_unlock(inode->i_sb); |
0ab2621e | 636 | if (error) { |
0ab2621e | 637 | return error; |
1da177e4 | 638 | } |
bd4c625c | 639 | |
0ab2621e JM |
640 | error = reiserfs_xattr_set_handle(&th, inode, name, |
641 | buffer, buffer_size, flags); | |
bd4c625c | 642 | |
4c05141d | 643 | reiserfs_write_lock(inode->i_sb); |
58d85426 | 644 | error2 = journal_end(&th); |
4c05141d | 645 | reiserfs_write_unlock(inode->i_sb); |
0ab2621e JM |
646 | if (error == 0) |
647 | error = error2; | |
0ab2621e JM |
648 | |
649 | return error; | |
1da177e4 LT |
650 | } |
651 | ||
652 | /* | |
1b1dcc1b | 653 | * inode->i_mutex: down |
1da177e4 LT |
654 | */ |
655 | int | |
48b32a35 | 656 | reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, |
bd4c625c | 657 | size_t buffer_size) |
1da177e4 | 658 | { |
bd4c625c | 659 | ssize_t err = 0; |
3227e14c | 660 | struct dentry *dentry; |
bd4c625c LT |
661 | size_t isize; |
662 | size_t file_pos = 0; | |
663 | size_t buffer_pos = 0; | |
664 | struct page *page; | |
bd4c625c LT |
665 | __u32 hash = 0; |
666 | ||
667 | if (name == NULL) | |
668 | return -EINVAL; | |
669 | ||
098297b2 JM |
670 | /* |
671 | * We can't have xattrs attached to v1 items since they don't have | |
672 | * generation numbers | |
673 | */ | |
bd4c625c LT |
674 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
675 | return -EOPNOTSUPP; | |
676 | ||
c2bb80b8 JK |
677 | /* |
678 | * priv_root needn't be initialized during mount so allow initial | |
679 | * lookups to succeed. | |
680 | */ | |
681 | if (!REISERFS_SB(inode->i_sb)->priv_root) | |
682 | return 0; | |
683 | ||
48b32a35 | 684 | dentry = xattr_lookup(inode, name, XATTR_REPLACE); |
3227e14c JM |
685 | if (IS_ERR(dentry)) { |
686 | err = PTR_ERR(dentry); | |
bd4c625c LT |
687 | goto out; |
688 | } | |
689 | ||
8b6dd72a | 690 | down_read(&REISERFS_I(inode)->i_xattr_sem); |
d984561b | 691 | |
2b0143b5 | 692 | isize = i_size_read(d_inode(dentry)); |
bd4c625c LT |
693 | |
694 | /* Just return the size needed */ | |
695 | if (buffer == NULL) { | |
696 | err = isize - sizeof(struct reiserfs_xattr_header); | |
8b6dd72a | 697 | goto out_unlock; |
bd4c625c LT |
698 | } |
699 | ||
700 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { | |
701 | err = -ERANGE; | |
8b6dd72a | 702 | goto out_unlock; |
bd4c625c LT |
703 | } |
704 | ||
705 | while (file_pos < isize) { | |
706 | size_t chunk; | |
707 | char *data; | |
708 | size_t skip = 0; | |
f3fb9e27 | 709 | |
09cbfeaf KS |
710 | if (isize - file_pos > PAGE_SIZE) |
711 | chunk = PAGE_SIZE; | |
bd4c625c LT |
712 | else |
713 | chunk = isize - file_pos; | |
714 | ||
2b0143b5 | 715 | page = reiserfs_get_page(d_inode(dentry), file_pos); |
bd4c625c LT |
716 | if (IS_ERR(page)) { |
717 | err = PTR_ERR(page); | |
8b6dd72a | 718 | goto out_unlock; |
bd4c625c LT |
719 | } |
720 | ||
721 | lock_page(page); | |
722 | data = page_address(page); | |
723 | if (file_pos == 0) { | |
724 | struct reiserfs_xattr_header *rxh = | |
725 | (struct reiserfs_xattr_header *)data; | |
726 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
727 | chunk -= skip; | |
728 | /* Magic doesn't match up.. */ | |
729 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { | |
730 | unlock_page(page); | |
731 | reiserfs_put_page(page); | |
a72bdb1c | 732 | reiserfs_warning(inode->i_sb, "jdm-20001", |
bd4c625c LT |
733 | "Invalid magic for xattr (%s) " |
734 | "associated with %k", name, | |
735 | INODE_PKEY(inode)); | |
736 | err = -EIO; | |
8b6dd72a | 737 | goto out_unlock; |
bd4c625c LT |
738 | } |
739 | hash = le32_to_cpu(rxh->h_hash); | |
740 | } | |
741 | memcpy(buffer + buffer_pos, data + skip, chunk); | |
742 | unlock_page(page); | |
743 | reiserfs_put_page(page); | |
744 | file_pos += chunk; | |
745 | buffer_pos += chunk; | |
746 | skip = 0; | |
747 | } | |
748 | err = isize - sizeof(struct reiserfs_xattr_header); | |
749 | ||
750 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != | |
751 | hash) { | |
a72bdb1c | 752 | reiserfs_warning(inode->i_sb, "jdm-20002", |
bd4c625c LT |
753 | "Invalid hash for xattr (%s) associated " |
754 | "with %k", name, INODE_PKEY(inode)); | |
755 | err = -EIO; | |
756 | } | |
757 | ||
8b6dd72a JM |
758 | out_unlock: |
759 | up_read(&REISERFS_I(inode)->i_xattr_sem); | |
3227e14c | 760 | dput(dentry); |
bd4c625c | 761 | |
a72bdb1c | 762 | out: |
bd4c625c | 763 | return err; |
1da177e4 LT |
764 | } |
765 | ||
48b32a35 JM |
766 | /* |
767 | * In order to implement different sets of xattr operations for each xattr | |
768 | * prefix with the generic xattr API, a filesystem should create a | |
769 | * null-terminated array of struct xattr_handler (one for each prefix) and | |
770 | * hang a pointer to it off of the s_xattr field of the superblock. | |
771 | * | |
772 | * The generic_fooxattr() functions will use this list to dispatch xattr | |
773 | * operations to the correct xattr_handler. | |
774 | */ | |
775 | #define for_each_xattr_handler(handlers, handler) \ | |
776 | for ((handler) = *(handlers)++; \ | |
777 | (handler) != NULL; \ | |
778 | (handler) = *(handlers)++) | |
1da177e4 | 779 | |
48b32a35 | 780 | /* This is the implementation for the xattr plugin infrastructure */ |
94d09a98 SH |
781 | static inline const struct xattr_handler * |
782 | find_xattr_handler_prefix(const struct xattr_handler **handlers, | |
48b32a35 | 783 | const char *name) |
1da177e4 | 784 | { |
94d09a98 | 785 | const struct xattr_handler *xah; |
bd4c625c | 786 | |
48b32a35 JM |
787 | if (!handlers) |
788 | return NULL; | |
bd4c625c | 789 | |
48b32a35 | 790 | for_each_xattr_handler(handlers, xah) { |
98e9cb57 AG |
791 | const char *prefix = xattr_prefix(xah); |
792 | if (strncmp(prefix, name, strlen(prefix)) == 0) | |
48b32a35 | 793 | break; |
bd4c625c LT |
794 | } |
795 | ||
48b32a35 | 796 | return xah; |
bd4c625c | 797 | } |
1da177e4 | 798 | |
48b32a35 | 799 | struct listxattr_buf { |
4acf381e | 800 | struct dir_context ctx; |
48b32a35 JM |
801 | size_t size; |
802 | size_t pos; | |
803 | char *buf; | |
431547b3 | 804 | struct dentry *dentry; |
1da177e4 LT |
805 | }; |
806 | ||
ac7576f4 MS |
807 | static int listxattr_filler(struct dir_context *ctx, const char *name, |
808 | int namelen, loff_t offset, u64 ino, | |
809 | unsigned int d_type) | |
1da177e4 | 810 | { |
ac7576f4 MS |
811 | struct listxattr_buf *b = |
812 | container_of(ctx, struct listxattr_buf, ctx); | |
48b32a35 | 813 | size_t size; |
f3fb9e27 | 814 | |
48b32a35 JM |
815 | if (name[0] != '.' || |
816 | (namelen != 1 && (name[1] != '.' || namelen != 2))) { | |
94d09a98 | 817 | const struct xattr_handler *handler; |
f3fb9e27 | 818 | |
431547b3 | 819 | handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr, |
48b32a35 | 820 | name); |
764a5c6b AG |
821 | if (!handler /* Unsupported xattr name */ || |
822 | (handler->list && !handler->list(b->dentry))) | |
48b32a35 | 823 | return 0; |
764a5c6b | 824 | size = namelen + 1; |
48b32a35 | 825 | if (b->buf) { |
a13f085d JH |
826 | if (b->pos + size > b->size) { |
827 | b->pos = -ERANGE; | |
48b32a35 | 828 | return -ERANGE; |
a13f085d | 829 | } |
764a5c6b AG |
830 | memcpy(b->buf + b->pos, name, namelen); |
831 | b->buf[b->pos + namelen] = 0; | |
bd4c625c | 832 | } |
48b32a35 JM |
833 | b->pos += size; |
834 | } | |
bd4c625c | 835 | return 0; |
1da177e4 | 836 | } |
bd4c625c | 837 | |
1da177e4 LT |
838 | /* |
839 | * Inode operation listxattr() | |
840 | * | |
48b32a35 JM |
841 | * We totally ignore the generic listxattr here because it would be stupid |
842 | * not to. Since the xattrs are organized in a directory, we can just | |
843 | * readdir to find them. | |
1da177e4 | 844 | */ |
bd4c625c | 845 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
1da177e4 | 846 | { |
bd4c625c LT |
847 | struct dentry *dir; |
848 | int err = 0; | |
48b32a35 | 849 | struct listxattr_buf buf = { |
4acf381e | 850 | .ctx.actor = listxattr_filler, |
431547b3 | 851 | .dentry = dentry, |
48b32a35 JM |
852 | .buf = buffer, |
853 | .size = buffer ? size : 0, | |
854 | }; | |
bd4c625c | 855 | |
2b0143b5 | 856 | if (d_really_is_negative(dentry)) |
bd4c625c LT |
857 | return -EINVAL; |
858 | ||
60e4cf67 | 859 | if (get_inode_sd_version(d_inode(dentry)) == STAT_DATA_V1) |
bd4c625c LT |
860 | return -EOPNOTSUPP; |
861 | ||
2b0143b5 | 862 | dir = open_xa_dir(d_inode(dentry), XATTR_REPLACE); |
bd4c625c LT |
863 | if (IS_ERR(dir)) { |
864 | err = PTR_ERR(dir); | |
865 | if (err == -ENODATA) | |
48b32a35 | 866 | err = 0; /* Not an error if there aren't any xattrs */ |
bd4c625c LT |
867 | goto out; |
868 | } | |
869 | ||
5955102c | 870 | inode_lock_nested(d_inode(dir), I_MUTEX_XATTR); |
2b0143b5 | 871 | err = reiserfs_readdir_inode(d_inode(dir), &buf.ctx); |
5955102c | 872 | inode_unlock(d_inode(dir)); |
bd4c625c | 873 | |
48b32a35 JM |
874 | if (!err) |
875 | err = buf.pos; | |
bd4c625c | 876 | |
3227e14c | 877 | dput(dir); |
8b6dd72a | 878 | out: |
bd4c625c | 879 | return err; |
1da177e4 LT |
880 | } |
881 | ||
a72bdb1c | 882 | static int create_privroot(struct dentry *dentry) |
1da177e4 | 883 | { |
a72bdb1c | 884 | int err; |
2b0143b5 | 885 | struct inode *inode = d_inode(dentry->d_parent); |
f3fb9e27 | 886 | |
5955102c | 887 | WARN_ON_ONCE(!inode_is_locked(inode)); |
5a6059c3 | 888 | |
6c17675e | 889 | err = xattr_mkdir(inode, dentry, 0700); |
2b0143b5 | 890 | if (err || d_really_is_negative(dentry)) { |
edcc37a0 AV |
891 | reiserfs_warning(dentry->d_sb, "jdm-20006", |
892 | "xattrs/ACLs enabled and couldn't " | |
893 | "find/create .reiserfs_priv. " | |
894 | "Failing mount."); | |
895 | return -EOPNOTSUPP; | |
bd4c625c LT |
896 | } |
897 | ||
2b0143b5 | 898 | d_inode(dentry)->i_flags |= S_PRIVATE; |
60e4cf67 | 899 | d_inode(dentry)->i_opflags &= ~IOP_XATTR; |
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, | |
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 | ||
549c7297 CB |
951 | int reiserfs_permission(struct user_namespace *mnt_userns, struct inode *inode, |
952 | int mask) | |
b83674c0 JM |
953 | { |
954 | /* | |
955 | * We don't do permission checks on the internal objects. | |
956 | * Permissions are determined by the "owning" object. | |
957 | */ | |
958 | if (IS_PRIVATE(inode)) | |
959 | return 0; | |
960 | ||
47291baa | 961 | return generic_permission(&init_user_ns, inode, mask); |
b83674c0 JM |
962 | } |
963 | ||
0b728e19 | 964 | static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 965 | { |
cac36f70 | 966 | return -EPERM; |
1da177e4 LT |
967 | } |
968 | ||
e16404ed | 969 | static const struct dentry_operations xattr_lookup_poison_ops = { |
cac36f70 | 970 | .d_revalidate = xattr_hide_revalidate, |
1da177e4 LT |
971 | }; |
972 | ||
edcc37a0 AV |
973 | int reiserfs_lookup_privroot(struct super_block *s) |
974 | { | |
975 | struct dentry *dentry; | |
976 | int err = 0; | |
977 | ||
978 | /* If we don't have the privroot located yet - go find it */ | |
5955102c | 979 | inode_lock(d_inode(s->s_root)); |
edcc37a0 AV |
980 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, |
981 | strlen(PRIVROOT_NAME)); | |
982 | if (!IS_ERR(dentry)) { | |
983 | REISERFS_SB(s)->priv_root = dentry; | |
fb045adb | 984 | d_set_d_op(dentry, &xattr_lookup_poison_ops); |
60e4cf67 | 985 | if (d_really_is_positive(dentry)) { |
2b0143b5 | 986 | d_inode(dentry)->i_flags |= S_PRIVATE; |
60e4cf67 JM |
987 | d_inode(dentry)->i_opflags &= ~IOP_XATTR; |
988 | } | |
edcc37a0 AV |
989 | } else |
990 | err = PTR_ERR(dentry); | |
5955102c | 991 | inode_unlock(d_inode(s->s_root)); |
edcc37a0 AV |
992 | |
993 | return err; | |
994 | } | |
995 | ||
098297b2 JM |
996 | /* |
997 | * We need to take a copy of the mount flags since things like | |
1751e8a6 | 998 | * SB_RDONLY don't get set until *after* we're called. |
098297b2 JM |
999 | * mount_flags != mount_options |
1000 | */ | |
bd4c625c | 1001 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
1da177e4 | 1002 | { |
bd4c625c | 1003 | int err = 0; |
ab17c4f0 | 1004 | struct dentry *privroot = REISERFS_SB(s)->priv_root; |
bd4c625c | 1005 | |
a72bdb1c JM |
1006 | err = xattr_mount_check(s); |
1007 | if (err) | |
bd4c625c | 1008 | goto error; |
bd4c625c | 1009 | |
1751e8a6 | 1010 | if (d_really_is_negative(privroot) && !(mount_flags & SB_RDONLY)) { |
5955102c | 1011 | inode_lock(d_inode(s->s_root)); |
edcc37a0 | 1012 | err = create_privroot(REISERFS_SB(s)->priv_root); |
5955102c | 1013 | inode_unlock(d_inode(s->s_root)); |
bd4c625c | 1014 | } |
ab17c4f0 | 1015 | |
2b0143b5 | 1016 | if (d_really_is_positive(privroot)) { |
5955102c | 1017 | inode_lock(d_inode(privroot)); |
ab17c4f0 JM |
1018 | if (!REISERFS_SB(s)->xattr_root) { |
1019 | struct dentry *dentry; | |
f3fb9e27 | 1020 | |
ab17c4f0 JM |
1021 | dentry = lookup_one_len(XAROOT_NAME, privroot, |
1022 | strlen(XAROOT_NAME)); | |
1023 | if (!IS_ERR(dentry)) | |
1024 | REISERFS_SB(s)->xattr_root = dentry; | |
1025 | else | |
1026 | err = PTR_ERR(dentry); | |
1027 | } | |
5955102c | 1028 | inode_unlock(d_inode(privroot)); |
ab17c4f0 | 1029 | } |
48b32a35 | 1030 | |
a72bdb1c | 1031 | error: |
bd4c625c | 1032 | if (err) { |
a228bf8f JM |
1033 | clear_bit(REISERFS_XATTRS_USER, &REISERFS_SB(s)->s_mount_opt); |
1034 | clear_bit(REISERFS_POSIXACL, &REISERFS_SB(s)->s_mount_opt); | |
bd4c625c LT |
1035 | } |
1036 | ||
1751e8a6 | 1037 | /* The super_block SB_POSIXACL must mirror the (no)acl mount option. */ |
bd4c625c | 1038 | if (reiserfs_posixacl(s)) |
1751e8a6 | 1039 | s->s_flags |= SB_POSIXACL; |
ab17c4f0 | 1040 | else |
1751e8a6 | 1041 | s->s_flags &= ~SB_POSIXACL; |
bd4c625c LT |
1042 | |
1043 | return err; | |
1da177e4 | 1044 | } |