blob: d78089690965b3540344ea8fafbd9403fe825cf8 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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.
Jeff Mahoneyd9845612009-03-30 14:02:35 -040030 *
31 * Locking works like so:
Jeff Mahoney8b6dd722009-03-30 14:02:36 -040032 * Directory components (xattr root, xattr dir) are protectd by their i_mutex.
33 * The xattrs themselves are protected by the xattr_sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 */
35
36#include <linux/reiserfs_fs.h>
Randy Dunlap16f7e0f2006-01-11 12:17:46 -080037#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <linux/dcache.h>
39#include <linux/namei.h>
40#include <linux/errno.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090041#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <linux/fs.h>
43#include <linux/file.h>
44#include <linux/pagemap.h>
45#include <linux/xattr.h>
46#include <linux/reiserfs_xattr.h>
47#include <linux/reiserfs_acl.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include <asm/uaccess.h>
Al Viro3277c392006-11-14 21:13:53 -080049#include <net/checksum.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <linux/stat.h>
Jeff Mahoney6c176752009-03-30 14:02:34 -040051#include <linux/quotaops.h>
Christoph Hellwig431547b2009-11-13 09:52:56 +000052#include <linux/security.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#define PRIVROOT_NAME ".reiserfs_priv"
55#define XAROOT_NAME "xattrs"
56
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Jeff Mahoney6c176752009-03-30 14:02:34 -040058/* Helpers for inode ops. We do this so that we don't have all the VFS
59 * overhead and also for proper i_mutex annotation.
60 * dir->i_mutex must be held for all of them. */
Jeff Mahoney3a355cc2009-03-30 16:49:58 -040061#ifdef CONFIG_REISERFS_FS_XATTR
Jeff Mahoney6c176752009-03-30 14:02:34 -040062static int xattr_create(struct inode *dir, struct dentry *dentry, int mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -070063{
Jeff Mahoney6c176752009-03-30 14:02:34 -040064 BUG_ON(!mutex_is_locked(&dir->i_mutex));
Jeff Mahoney6c176752009-03-30 14:02:34 -040065 return dir->i_op->create(dir, dentry, mode, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066}
Jeff Mahoney3a355cc2009-03-30 16:49:58 -040067#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
Jeff Mahoney6c176752009-03-30 14:02:34 -040069static int xattr_mkdir(struct inode *dir, struct dentry *dentry, int mode)
70{
71 BUG_ON(!mutex_is_locked(&dir->i_mutex));
Jeff Mahoney6c176752009-03-30 14:02:34 -040072 return dir->i_op->mkdir(dir, dentry, mode);
73}
74
75/* We use I_MUTEX_CHILD here to silence lockdep. It's safe because xattr
76 * mutation ops aren't called during rename or splace, which are the
77 * only other users of I_MUTEX_CHILD. It violates the ordering, but that's
78 * better than allocating another subclass just for this code. */
79static int xattr_unlink(struct inode *dir, struct dentry *dentry)
80{
81 int error;
82 BUG_ON(!mutex_is_locked(&dir->i_mutex));
Jeff Mahoney6c176752009-03-30 14:02:34 -040083
Frederic Weisbecker4dd85962009-12-30 07:26:28 +010084 reiserfs_mutex_lock_nested_safe(&dentry->d_inode->i_mutex,
85 I_MUTEX_CHILD, dir->i_sb);
Jeff Mahoney6c176752009-03-30 14:02:34 -040086 error = dir->i_op->unlink(dir, dentry);
87 mutex_unlock(&dentry->d_inode->i_mutex);
88
89 if (!error)
90 d_delete(dentry);
91 return error;
92}
93
94static int xattr_rmdir(struct inode *dir, struct dentry *dentry)
95{
96 int error;
97 BUG_ON(!mutex_is_locked(&dir->i_mutex));
Jeff Mahoney6c176752009-03-30 14:02:34 -040098
Frederic Weisbecker835d5242009-12-30 07:40:39 +010099 reiserfs_mutex_lock_nested_safe(&dentry->d_inode->i_mutex,
100 I_MUTEX_CHILD, dir->i_sb);
Jeff Mahoney6c176752009-03-30 14:02:34 -0400101 error = dir->i_op->rmdir(dir, dentry);
102 if (!error)
103 dentry->d_inode->i_flags |= S_DEAD;
104 mutex_unlock(&dentry->d_inode->i_mutex);
105 if (!error)
106 d_delete(dentry);
Jeff Mahoney6c176752009-03-30 14:02:34 -0400107
108 return error;
109}
110
Jeff Mahoney6c176752009-03-30 14:02:34 -0400111#define xattr_may_create(flags) (!flags || flags & XATTR_CREATE)
112
Jeff Mahoney6c176752009-03-30 14:02:34 -0400113static struct dentry *open_xa_root(struct super_block *sb, int flags)
114{
115 struct dentry *privroot = REISERFS_SB(sb)->priv_root;
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400116 struct dentry *xaroot;
117 if (!privroot->d_inode)
Jeff Mahoney6c176752009-03-30 14:02:34 -0400118 return ERR_PTR(-ENODATA);
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400119
120 mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR);
121
122 xaroot = dget(REISERFS_SB(sb)->xattr_root);
Jeff Mahoneyceb5edc2009-05-17 01:02:02 -0400123 if (!xaroot)
124 xaroot = ERR_PTR(-ENODATA);
125 else if (!xaroot->d_inode) {
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400126 int err = -ENODATA;
127 if (xattr_may_create(flags))
128 err = xattr_mkdir(privroot->d_inode, xaroot, 0700);
129 if (err) {
130 dput(xaroot);
131 xaroot = ERR_PTR(err);
132 }
133 }
134
135 mutex_unlock(&privroot->d_inode->i_mutex);
136 return xaroot;
Jeff Mahoney6c176752009-03-30 14:02:34 -0400137}
138
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700139static struct dentry *open_xa_dir(const struct inode *inode, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700141 struct dentry *xaroot, *xadir;
142 char namebuf[17];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Jeff Mahoney6c176752009-03-30 14:02:34 -0400144 xaroot = open_xa_root(inode->i_sb, flags);
Jeff Mahoney9b7f3752007-04-23 14:41:17 -0700145 if (IS_ERR(xaroot))
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700146 return xaroot;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700148 snprintf(namebuf, sizeof(namebuf), "%X.%X",
149 le32_to_cpu(INODE_PKEY(inode)->k_objectid),
150 inode->i_generation);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400152 mutex_lock_nested(&xaroot->d_inode->i_mutex, I_MUTEX_XATTR);
153
154 xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf));
155 if (!IS_ERR(xadir) && !xadir->d_inode) {
156 int err = -ENODATA;
157 if (xattr_may_create(flags))
158 err = xattr_mkdir(xaroot->d_inode, xadir, 0700);
159 if (err) {
160 dput(xadir);
161 xadir = ERR_PTR(err);
162 }
163 }
164
165 mutex_unlock(&xaroot->d_inode->i_mutex);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700166 dput(xaroot);
167 return xadir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168}
169
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400170/* The following are side effects of other operations that aren't explicitly
171 * modifying extended attributes. This includes operations such as permissions
172 * or ownership changes, object deletions, etc. */
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400173struct reiserfs_dentry_buf {
174 struct dentry *xadir;
175 int count;
176 struct dentry *dentries[8];
177};
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400178
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400179static int
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400180fill_with_dentries(void *buf, const char *name, int namelen, loff_t offset,
181 u64 ino, unsigned int d_type)
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400182{
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400183 struct reiserfs_dentry_buf *dbuf = buf;
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400184 struct dentry *dentry;
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400185 WARN_ON_ONCE(!mutex_is_locked(&dbuf->xadir->d_inode->i_mutex));
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400186
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400187 if (dbuf->count == ARRAY_SIZE(dbuf->dentries))
188 return -ENOSPC;
189
190 if (name[0] == '.' && (name[1] == '\0' ||
191 (name[1] == '.' && name[2] == '\0')))
192 return 0;
193
194 dentry = lookup_one_len(name, dbuf->xadir, namelen);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400195 if (IS_ERR(dentry)) {
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400196 return PTR_ERR(dentry);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400197 } else if (!dentry->d_inode) {
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400198 /* A directory entry exists, but no file? */
199 reiserfs_error(dentry->d_sb, "xattr-20003",
200 "Corrupted directory: xattr %s listed but "
201 "not found for file %s.\n",
202 dentry->d_name.name, dbuf->xadir->d_name.name);
203 dput(dentry);
204 return -EIO;
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400205 }
206
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400207 dbuf->dentries[dbuf->count++] = dentry;
208 return 0;
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400209}
210
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400211static void
212cleanup_dentry_buf(struct reiserfs_dentry_buf *buf)
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400213{
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400214 int i;
215 for (i = 0; i < buf->count; i++)
216 if (buf->dentries[i])
217 dput(buf->dentries[i]);
218}
219
220static int reiserfs_for_each_xattr(struct inode *inode,
221 int (*action)(struct dentry *, void *),
222 void *data)
223{
224 struct dentry *dir;
225 int i, err = 0;
226 loff_t pos = 0;
227 struct reiserfs_dentry_buf buf = {
228 .count = 0,
229 };
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400230
231 /* Skip out, an xattr has no xattrs associated with it */
232 if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1)
233 return 0;
234
Frederic Weisbecker27026a02009-12-30 05:06:21 +0100235 reiserfs_write_unlock(inode->i_sb);
Jeff Mahoney6c176752009-03-30 14:02:34 -0400236 dir = open_xa_dir(inode, XATTR_REPLACE);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400237 if (IS_ERR(dir)) {
238 err = PTR_ERR(dir);
Frederic Weisbecker27026a02009-12-30 05:06:21 +0100239 reiserfs_write_lock(inode->i_sb);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400240 goto out;
241 } else if (!dir->d_inode) {
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400242 err = 0;
Frederic Weisbecker27026a02009-12-30 05:06:21 +0100243 reiserfs_write_lock(inode->i_sb);
Jeff Mahoney6c176752009-03-30 14:02:34 -0400244 goto out_dir;
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400245 }
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400246
Jeff Mahoney6c176752009-03-30 14:02:34 -0400247 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR);
Frederic Weisbecker27026a02009-12-30 05:06:21 +0100248
249 reiserfs_write_lock(inode->i_sb);
250
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400251 buf.xadir = dir;
252 err = reiserfs_readdir_dentry(dir, &buf, fill_with_dentries, &pos);
253 while ((err == 0 || err == -ENOSPC) && buf.count) {
254 err = 0;
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400255
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400256 for (i = 0; i < buf.count && buf.dentries[i]; i++) {
257 int lerr = 0;
258 struct dentry *dentry = buf.dentries[i];
259
260 if (err == 0 && !S_ISDIR(dentry->d_inode->i_mode))
261 lerr = action(dentry, data);
262
263 dput(dentry);
264 buf.dentries[i] = NULL;
265 err = lerr ?: err;
266 }
267 buf.count = 0;
268 if (!err)
269 err = reiserfs_readdir_dentry(dir, &buf,
270 fill_with_dentries, &pos);
271 }
Jeff Mahoney6c176752009-03-30 14:02:34 -0400272 mutex_unlock(&dir->d_inode->i_mutex);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400273
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400274 /* Clean up after a failed readdir */
275 cleanup_dentry_buf(&buf);
276
277 if (!err) {
278 /* We start a transaction here to avoid a ABBA situation
279 * between the xattr root's i_mutex and the journal lock.
280 * This doesn't incur much additional overhead since the
281 * new transaction will just nest inside the
282 * outer transaction. */
283 int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 +
284 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb);
285 struct reiserfs_transaction_handle th;
286 err = journal_begin(&th, inode->i_sb, blocks);
287 if (!err) {
288 int jerror;
Frederic Weisbecker8b513f52009-12-30 07:28:58 +0100289 reiserfs_mutex_lock_nested_safe(
290 &dir->d_parent->d_inode->i_mutex,
291 I_MUTEX_XATTR, inode->i_sb);
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400292 err = action(dir, data);
293 jerror = journal_end(&th, inode->i_sb, blocks);
294 mutex_unlock(&dir->d_parent->d_inode->i_mutex);
295 err = jerror ?: err;
296 }
297 }
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400298out_dir:
299 dput(dir);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400300out:
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400301 /* -ENODATA isn't an error */
302 if (err == -ENODATA)
303 err = 0;
304 return err;
305}
306
307static int delete_one_xattr(struct dentry *dentry, void *data)
308{
309 struct inode *dir = dentry->d_parent->d_inode;
310
311 /* This is the xattr dir, handle specially. */
312 if (S_ISDIR(dentry->d_inode->i_mode))
313 return xattr_rmdir(dir, dentry);
314
315 return xattr_unlink(dir, dentry);
316}
317
318static int chown_one_xattr(struct dentry *dentry, void *data)
319{
320 struct iattr *attrs = data;
321 return reiserfs_setattr(dentry, attrs);
322}
323
324/* No i_mutex, but the inode is unconnected. */
325int reiserfs_delete_xattrs(struct inode *inode)
326{
327 int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL);
328 if (err)
329 reiserfs_warning(inode->i_sb, "jdm-20004",
330 "Couldn't delete all xattrs (%d)\n", err);
331 return err;
332}
333
334/* inode->i_mutex: down */
335int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs)
336{
337 int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs);
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400338 if (err)
339 reiserfs_warning(inode->i_sb, "jdm-20007",
340 "Couldn't chown all xattrs (%d)\n", err);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400341 return err;
342}
343
344#ifdef CONFIG_REISERFS_FS_XATTR
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345/* Returns a dentry corresponding to a specific extended attribute file
346 * for the inode. If flags allow, the file is created. Otherwise, a
347 * valid or negative dentry, or an error is returned. */
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400348static struct dentry *xattr_lookup(struct inode *inode, const char *name,
349 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700351 struct dentry *xadir, *xafile;
352 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700354 xadir = open_xa_dir(inode, flags);
Jeff Mahoney6c176752009-03-30 14:02:34 -0400355 if (IS_ERR(xadir))
David Howellse231c2e2008-02-07 00:15:26 -0800356 return ERR_CAST(xadir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400358 mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700359 xafile = lookup_one_len(name, xadir, strlen(name));
360 if (IS_ERR(xafile)) {
Jeff Mahoney6c176752009-03-30 14:02:34 -0400361 err = PTR_ERR(xafile);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700362 goto out;
Jeff Mahoney6c176752009-03-30 14:02:34 -0400363 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364
Jeff Mahoney6c176752009-03-30 14:02:34 -0400365 if (xafile->d_inode && (flags & XATTR_CREATE))
366 err = -EEXIST;
367
368 if (!xafile->d_inode) {
369 err = -ENODATA;
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400370 if (xattr_may_create(flags))
Jeff Mahoney6c176752009-03-30 14:02:34 -0400371 err = xattr_create(xadir->d_inode, xafile,
372 0700|S_IFREG);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700373 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374
Jeff Mahoney6c176752009-03-30 14:02:34 -0400375 if (err)
376 dput(xafile);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400377out:
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400378 mutex_unlock(&xadir->d_inode->i_mutex);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700379 dput(xadir);
380 if (err)
Jeff Mahoney6c176752009-03-30 14:02:34 -0400381 return ERR_PTR(err);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800382 return xafile;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383}
384
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385/* Internal operations on file data */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700386static inline void reiserfs_put_page(struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700388 kunmap(page);
389 page_cache_release(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390}
391
Jeff Mahoneyec6ea562009-03-30 14:02:30 -0400392static struct page *reiserfs_get_page(struct inode *dir, size_t n)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700394 struct address_space *mapping = dir->i_mapping;
395 struct page *page;
396 /* We can deadlock if we try to free dentries,
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300397 and an unlink/rmdir has just occurred - GFP_NOFS avoids this */
Al Viroc4cdd032005-10-21 03:22:39 -0400398 mapping_set_gfp_mask(mapping, GFP_NOFS);
Jeff Mahoneyec6ea562009-03-30 14:02:30 -0400399 page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700400 if (!IS_ERR(page)) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700401 kmap(page);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700402 if (PageError(page))
403 goto fail;
404 }
405 return page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700407 fail:
408 reiserfs_put_page(page);
409 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410}
411
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700412static inline __u32 xattr_hash(const char *msg, int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700414 return csum_partial(msg, len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415}
416
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -0700417int reiserfs_commit_write(struct file *f, struct page *page,
418 unsigned from, unsigned to);
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -0700419
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400420static void update_ctime(struct inode *inode)
421{
422 struct timespec now = current_fs_time(inode->i_sb);
Al Viro1d3382c2010-10-23 15:19:20 -0400423 if (inode_unhashed(inode) || !inode->i_nlink ||
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400424 timespec_equal(&inode->i_ctime, &now))
425 return;
426
427 inode->i_ctime = CURRENT_TIME_SEC;
428 mark_inode_dirty(inode);
429}
430
431static int lookup_and_delete_xattr(struct inode *inode, const char *name)
432{
433 int err = 0;
434 struct dentry *dentry, *xadir;
435
436 xadir = open_xa_dir(inode, XATTR_REPLACE);
437 if (IS_ERR(xadir))
438 return PTR_ERR(xadir);
439
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400440 mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400441 dentry = lookup_one_len(name, xadir, strlen(name));
442 if (IS_ERR(dentry)) {
443 err = PTR_ERR(dentry);
444 goto out_dput;
445 }
446
447 if (dentry->d_inode) {
Frederic Weisbecker4f3be1b2010-01-05 02:14:30 +0100448 reiserfs_write_lock(inode->i_sb);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400449 err = xattr_unlink(xadir->d_inode, dentry);
Frederic Weisbecker4f3be1b2010-01-05 02:14:30 +0100450 reiserfs_write_unlock(inode->i_sb);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400451 update_ctime(inode);
452 }
453
454 dput(dentry);
455out_dput:
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400456 mutex_unlock(&xadir->d_inode->i_mutex);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400457 dput(xadir);
458 return err;
459}
460
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -0700461
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462/* Generic extended attribute operations that can be used by xa plugins */
463
464/*
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800465 * inode->i_mutex: down
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 */
467int
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400468reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th,
469 struct inode *inode, const char *name,
470 const void *buffer, size_t buffer_size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700472 int err = 0;
Jeff Mahoney3227e142008-02-15 14:37:22 -0800473 struct dentry *dentry;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700474 struct page *page;
475 char *data;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700476 size_t file_pos = 0;
477 size_t buffer_pos = 0;
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400478 size_t new_size;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700479 __u32 xahash = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700481 if (get_inode_sd_version(inode) == STAT_DATA_V1)
482 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
Frederic Weisbecker3f14fea2009-12-30 07:03:53 +0100484 reiserfs_write_unlock(inode->i_sb);
Frederic Weisbecker4f3be1b2010-01-05 02:14:30 +0100485
486 if (!buffer) {
487 err = lookup_and_delete_xattr(inode, name);
488 reiserfs_write_lock(inode->i_sb);
489 return err;
490 }
491
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400492 dentry = xattr_lookup(inode, name, flags);
Frederic Weisbecker3f14fea2009-12-30 07:03:53 +0100493 if (IS_ERR(dentry)) {
494 reiserfs_write_lock(inode->i_sb);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400495 return PTR_ERR(dentry);
Frederic Weisbecker3f14fea2009-12-30 07:03:53 +0100496 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497
Frederic Weisbeckerf3e22f42010-01-03 03:44:53 +0100498 down_write(&REISERFS_I(inode)->i_xattr_sem);
Frederic Weisbecker3f14fea2009-12-30 07:03:53 +0100499
500 reiserfs_write_lock(inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400502 xahash = xattr_hash(buffer, buffer_size);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700503 while (buffer_pos < buffer_size || buffer_pos == 0) {
504 size_t chunk;
505 size_t skip = 0;
506 size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1));
507 if (buffer_size - buffer_pos > PAGE_CACHE_SIZE)
508 chunk = PAGE_CACHE_SIZE;
509 else
510 chunk = buffer_size - buffer_pos;
511
Jeff Mahoneyec6ea562009-03-30 14:02:30 -0400512 page = reiserfs_get_page(dentry->d_inode, file_pos);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700513 if (IS_ERR(page)) {
514 err = PTR_ERR(page);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400515 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700516 }
517
518 lock_page(page);
519 data = page_address(page);
520
521 if (file_pos == 0) {
522 struct reiserfs_xattr_header *rxh;
523 skip = file_pos = sizeof(struct reiserfs_xattr_header);
524 if (chunk + skip > PAGE_CACHE_SIZE)
525 chunk = PAGE_CACHE_SIZE - skip;
526 rxh = (struct reiserfs_xattr_header *)data;
527 rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC);
528 rxh->h_hash = cpu_to_le32(xahash);
529 }
530
Christoph Hellwigebdec242010-10-06 10:47:23 +0200531 err = __reiserfs_write_begin(page, page_offset, chunk + skip);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700532 if (!err) {
533 if (buffer)
534 memcpy(data + skip, buffer + buffer_pos, chunk);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800535 err = reiserfs_commit_write(NULL, page, page_offset,
536 page_offset + chunk +
537 skip);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700538 }
539 unlock_page(page);
540 reiserfs_put_page(page);
541 buffer_pos += chunk;
542 file_pos += chunk;
543 skip = 0;
544 if (err || buffer_size == 0 || !buffer)
545 break;
546 }
547
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400548 new_size = buffer_size + sizeof(struct reiserfs_xattr_header);
549 if (!err && new_size < i_size_read(dentry->d_inode)) {
550 struct iattr newattrs = {
551 .ia_ctime = current_fs_time(inode->i_sb),
Jeff Mahoneyfb2162d2010-04-23 13:17:41 -0400552 .ia_size = new_size,
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400553 .ia_valid = ATTR_SIZE | ATTR_CTIME,
554 };
Frederic Weisbecker31370f62010-01-07 15:55:31 +0100555
556 reiserfs_write_unlock(inode->i_sb);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400557 mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR);
558 down_write(&dentry->d_inode->i_alloc_sem);
Frederic Weisbecker31370f62010-01-07 15:55:31 +0100559 reiserfs_write_lock(inode->i_sb);
560
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400561 err = reiserfs_setattr(dentry, &newattrs);
562 up_write(&dentry->d_inode->i_alloc_sem);
563 mutex_unlock(&dentry->d_inode->i_mutex);
564 } else
565 update_ctime(inode);
566out_unlock:
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400567 up_write(&REISERFS_I(inode)->i_xattr_sem);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800568 dput(dentry);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400569 return err;
570}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700571
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400572/* We need to start a transaction to maintain lock ordering */
573int reiserfs_xattr_set(struct inode *inode, const char *name,
574 const void *buffer, size_t buffer_size, int flags)
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400575{
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400576
577 struct reiserfs_transaction_handle th;
578 int error, error2;
579 size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size);
580
581 if (!(flags & XATTR_REPLACE))
582 jbegin_count += reiserfs_xattr_jcreate_nblocks(inode);
583
584 reiserfs_write_lock(inode->i_sb);
585 error = journal_begin(&th, inode->i_sb, jbegin_count);
586 if (error) {
587 reiserfs_write_unlock(inode->i_sb);
588 return error;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700589 }
590
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400591 error = reiserfs_xattr_set_handle(&th, inode, name,
592 buffer, buffer_size, flags);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700593
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400594 error2 = journal_end(&th, inode->i_sb, jbegin_count);
595 if (error == 0)
596 error = error2;
597 reiserfs_write_unlock(inode->i_sb);
598
599 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600}
601
602/*
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800603 * inode->i_mutex: down
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 */
605int
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400606reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700607 size_t buffer_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700609 ssize_t err = 0;
Jeff Mahoney3227e142008-02-15 14:37:22 -0800610 struct dentry *dentry;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700611 size_t isize;
612 size_t file_pos = 0;
613 size_t buffer_pos = 0;
614 struct page *page;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700615 __u32 hash = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700617 if (name == NULL)
618 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700620 /* We can't have xattrs attached to v1 items since they don't have
621 * generation numbers */
622 if (get_inode_sd_version(inode) == STAT_DATA_V1)
623 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400625 dentry = xattr_lookup(inode, name, XATTR_REPLACE);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800626 if (IS_ERR(dentry)) {
627 err = PTR_ERR(dentry);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700628 goto out;
629 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400631 down_read(&REISERFS_I(inode)->i_xattr_sem);
Jeff Mahoneyd9845612009-03-30 14:02:35 -0400632
Jeff Mahoneyf437c522009-03-30 14:02:29 -0400633 isize = i_size_read(dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700635 /* Just return the size needed */
636 if (buffer == NULL) {
637 err = isize - sizeof(struct reiserfs_xattr_header);
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400638 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700639 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700641 if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) {
642 err = -ERANGE;
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400643 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700644 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700646 while (file_pos < isize) {
647 size_t chunk;
648 char *data;
649 size_t skip = 0;
650 if (isize - file_pos > PAGE_CACHE_SIZE)
651 chunk = PAGE_CACHE_SIZE;
652 else
653 chunk = isize - file_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654
Jeff Mahoneyec6ea562009-03-30 14:02:30 -0400655 page = reiserfs_get_page(dentry->d_inode, file_pos);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700656 if (IS_ERR(page)) {
657 err = PTR_ERR(page);
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400658 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700659 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700661 lock_page(page);
662 data = page_address(page);
663 if (file_pos == 0) {
664 struct reiserfs_xattr_header *rxh =
665 (struct reiserfs_xattr_header *)data;
666 skip = file_pos = sizeof(struct reiserfs_xattr_header);
667 chunk -= skip;
668 /* Magic doesn't match up.. */
669 if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) {
670 unlock_page(page);
671 reiserfs_put_page(page);
Jeff Mahoney45b03d52009-03-30 14:02:21 -0400672 reiserfs_warning(inode->i_sb, "jdm-20001",
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700673 "Invalid magic for xattr (%s) "
674 "associated with %k", name,
675 INODE_PKEY(inode));
676 err = -EIO;
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400677 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700678 }
679 hash = le32_to_cpu(rxh->h_hash);
680 }
681 memcpy(buffer + buffer_pos, data + skip, chunk);
682 unlock_page(page);
683 reiserfs_put_page(page);
684 file_pos += chunk;
685 buffer_pos += chunk;
686 skip = 0;
687 }
688 err = isize - sizeof(struct reiserfs_xattr_header);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700690 if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) !=
691 hash) {
Jeff Mahoney45b03d52009-03-30 14:02:21 -0400692 reiserfs_warning(inode->i_sb, "jdm-20002",
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700693 "Invalid hash for xattr (%s) associated "
694 "with %k", name, INODE_PKEY(inode));
695 err = -EIO;
696 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400698out_unlock:
699 up_read(&REISERFS_I(inode)->i_xattr_sem);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800700 dput(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400702out:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700703 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704}
705
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400706/*
707 * In order to implement different sets of xattr operations for each xattr
708 * prefix with the generic xattr API, a filesystem should create a
709 * null-terminated array of struct xattr_handler (one for each prefix) and
710 * hang a pointer to it off of the s_xattr field of the superblock.
711 *
712 * The generic_fooxattr() functions will use this list to dispatch xattr
713 * operations to the correct xattr_handler.
714 */
715#define for_each_xattr_handler(handlers, handler) \
716 for ((handler) = *(handlers)++; \
717 (handler) != NULL; \
718 (handler) = *(handlers)++)
719
720/* This is the implementation for the xattr plugin infrastructure */
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700721static inline const struct xattr_handler *
722find_xattr_handler_prefix(const struct xattr_handler **handlers,
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400723 const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724{
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700725 const struct xattr_handler *xah;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400727 if (!handlers)
728 return NULL;
729
730 for_each_xattr_handler(handlers, xah) {
731 if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0)
732 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 }
734
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400735 return xah;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736}
737
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738
739/*
740 * Inode operation getxattr()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 */
742ssize_t
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700743reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer,
744 size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745{
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700746 const struct xattr_handler *handler;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747
Christoph Hellwig431547b2009-11-13 09:52:56 +0000748 handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400749
Christoph Hellwig431547b2009-11-13 09:52:56 +0000750 if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700751 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752
Christoph Hellwig431547b2009-11-13 09:52:56 +0000753 return handler->get(dentry, name, buffer, size, handler->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754}
755
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756/*
757 * Inode operation setxattr()
758 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800759 * dentry->d_inode->i_mutex down
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 */
761int
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700762reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value,
763 size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764{
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700765 const struct xattr_handler *handler;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766
Christoph Hellwig431547b2009-11-13 09:52:56 +0000767 handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400768
Christoph Hellwig431547b2009-11-13 09:52:56 +0000769 if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700770 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
Christoph Hellwig431547b2009-11-13 09:52:56 +0000772 return handler->set(dentry, name, value, size, flags, handler->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773}
774
775/*
776 * Inode operation removexattr()
777 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800778 * dentry->d_inode->i_mutex down
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700780int reiserfs_removexattr(struct dentry *dentry, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781{
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700782 const struct xattr_handler *handler;
Christoph Hellwig431547b2009-11-13 09:52:56 +0000783 handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784
Christoph Hellwig431547b2009-11-13 09:52:56 +0000785 if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700786 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
Christoph Hellwig431547b2009-11-13 09:52:56 +0000788 return handler->set(dentry, name, NULL, 0, XATTR_REPLACE, handler->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789}
790
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400791struct listxattr_buf {
792 size_t size;
793 size_t pos;
794 char *buf;
Christoph Hellwig431547b2009-11-13 09:52:56 +0000795 struct dentry *dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796};
797
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400798static int listxattr_filler(void *buf, const char *name, int namelen,
799 loff_t offset, u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800{
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400801 struct listxattr_buf *b = (struct listxattr_buf *)buf;
802 size_t size;
803 if (name[0] != '.' ||
804 (namelen != 1 && (name[1] != '.' || namelen != 2))) {
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700805 const struct xattr_handler *handler;
Christoph Hellwig431547b2009-11-13 09:52:56 +0000806 handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr,
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400807 name);
808 if (!handler) /* Unsupported xattr name */
809 return 0;
810 if (b->buf) {
Christoph Hellwig431547b2009-11-13 09:52:56 +0000811 size = handler->list(b->dentry, b->buf + b->pos,
812 b->size, name, namelen,
813 handler->flags);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400814 if (size > b->size)
815 return -ERANGE;
816 } else {
Christoph Hellwig431547b2009-11-13 09:52:56 +0000817 size = handler->list(b->dentry, NULL, 0, name,
818 namelen, handler->flags);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700819 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400821 b->pos += size;
822 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700823 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700825
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826/*
827 * Inode operation listxattr()
828 *
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400829 * We totally ignore the generic listxattr here because it would be stupid
830 * not to. Since the xattrs are organized in a directory, we can just
831 * readdir to find them.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700833ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700835 struct dentry *dir;
836 int err = 0;
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400837 loff_t pos = 0;
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400838 struct listxattr_buf buf = {
Christoph Hellwig431547b2009-11-13 09:52:56 +0000839 .dentry = dentry,
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400840 .buf = buffer,
841 .size = buffer ? size : 0,
842 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700844 if (!dentry->d_inode)
845 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846
Jeff Mahoney677c9b22009-05-05 15:30:17 -0400847 if (!dentry->d_sb->s_xattr ||
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700848 get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
849 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850
Jeff Mahoney6c176752009-03-30 14:02:34 -0400851 dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700852 if (IS_ERR(dir)) {
853 err = PTR_ERR(dir);
854 if (err == -ENODATA)
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400855 err = 0; /* Not an error if there aren't any xattrs */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700856 goto out;
857 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858
Jeff Mahoney6c176752009-03-30 14:02:34 -0400859 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR);
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400860 err = reiserfs_readdir_dentry(dir, &buf, listxattr_filler, &pos);
Jeff Mahoney6c176752009-03-30 14:02:34 -0400861 mutex_unlock(&dir->d_inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400863 if (!err)
864 err = buf.pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865
Jeff Mahoney3227e142008-02-15 14:37:22 -0800866 dput(dir);
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400867out:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700868 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869}
870
Nick Pigginb74c79e2011-01-07 17:49:58 +1100871static int reiserfs_check_acl(struct inode *inode, int mask, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872{
Christoph Hellwigec191572006-02-01 03:06:46 -0800873 struct posix_acl *acl;
874 int error = -EAGAIN; /* do regular unix permission checks by default */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700875
Nick Pigginb74c79e2011-01-07 17:49:58 +1100876 if (flags & IPERM_FLAG_RCU)
877 return -ECHILD;
878
Christoph Hellwigec191572006-02-01 03:06:46 -0800879 acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
880
Christoph Hellwigec191572006-02-01 03:06:46 -0800881 if (acl) {
882 if (!IS_ERR(acl)) {
883 error = posix_acl_permission(inode, acl, mask);
884 posix_acl_release(acl);
885 } else if (PTR_ERR(acl) != -ENODATA)
886 error = PTR_ERR(acl);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700887 }
888
Christoph Hellwigec191572006-02-01 03:06:46 -0800889 return error;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700890}
891
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400892static int create_privroot(struct dentry *dentry)
893{
894 int err;
895 struct inode *inode = dentry->d_parent->d_inode;
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400896 WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex));
897
Jeff Mahoney6c176752009-03-30 14:02:34 -0400898 err = xattr_mkdir(inode, dentry, 0700);
Al Viroedcc37a2009-05-03 06:00:05 -0400899 if (err || !dentry->d_inode) {
900 reiserfs_warning(dentry->d_sb, "jdm-20006",
901 "xattrs/ACLs enabled and couldn't "
902 "find/create .reiserfs_priv. "
903 "Failing mount.");
904 return -EOPNOTSUPP;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700905 }
906
Al Viroedcc37a2009-05-03 06:00:05 -0400907 dentry->d_inode->i_flags |= S_PRIVATE;
908 reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr "
909 "storage.\n", PRIVROOT_NAME);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700910
Al Viroedcc37a2009-05-03 06:00:05 -0400911 return 0;
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400912}
913
Jeff Mahoney12abb352009-05-17 01:02:01 -0400914#else
915int __init reiserfs_xattr_register_handlers(void) { return 0; }
916void reiserfs_xattr_unregister_handlers(void) {}
917static int create_privroot(struct dentry *dentry) { return 0; }
918#endif
919
920/* Actual operations that are exported to VFS-land */
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700921const struct xattr_handler *reiserfs_xattr_handlers[] = {
Jeff Mahoney12abb352009-05-17 01:02:01 -0400922#ifdef CONFIG_REISERFS_FS_XATTR
923 &reiserfs_xattr_user_handler,
924 &reiserfs_xattr_trusted_handler,
925#endif
926#ifdef CONFIG_REISERFS_FS_SECURITY
927 &reiserfs_xattr_security_handler,
928#endif
929#ifdef CONFIG_REISERFS_FS_POSIX_ACL
930 &reiserfs_posix_acl_access_handler,
931 &reiserfs_posix_acl_default_handler,
932#endif
933 NULL
934};
935
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400936static int xattr_mount_check(struct super_block *s)
937{
938 /* We need generation numbers to ensure that the oid mapping is correct
939 * v3.5 filesystems don't have them. */
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400940 if (old_format_only(s)) {
941 if (reiserfs_xattrs_optional(s)) {
942 /* Old format filesystem, but optional xattrs have
943 * been enabled. Error out. */
944 reiserfs_warning(s, "jdm-2005",
945 "xattrs/ACLs not supported "
946 "on pre-v3.6 format filesystems. "
947 "Failing mount.");
948 return -EOPNOTSUPP;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700949 }
950 }
951
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400952 return 0;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700953}
954
Nick Pigginb74c79e2011-01-07 17:49:58 +1100955int reiserfs_permission(struct inode *inode, int mask, unsigned int flags)
Jeff Mahoneyb83674c2009-05-17 01:02:03 -0400956{
957 /*
958 * We don't do permission checks on the internal objects.
959 * Permissions are determined by the "owning" object.
960 */
961 if (IS_PRIVATE(inode))
962 return 0;
963
964#ifdef CONFIG_REISERFS_FS_XATTR
965 /*
966 * Stat data v1 doesn't support ACLs.
967 */
968 if (get_inode_sd_version(inode) != STAT_DATA_V1)
Nick Pigginb74c79e2011-01-07 17:49:58 +1100969 return generic_permission(inode, mask, flags,
970 reiserfs_check_acl);
Jeff Mahoneyb83674c2009-05-17 01:02:03 -0400971#endif
Nick Pigginb74c79e2011-01-07 17:49:58 +1100972 return generic_permission(inode, mask, flags, NULL);
Jeff Mahoneyb83674c2009-05-17 01:02:03 -0400973}
974
Jeff Mahoneycac36f72010-04-23 13:17:37 -0400975static int xattr_hide_revalidate(struct dentry *dentry, struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976{
Jeff Mahoneycac36f72010-04-23 13:17:37 -0400977 return -EPERM;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700978}
979
Al Viroe16404e2009-02-20 05:55:13 +0000980static const struct dentry_operations xattr_lookup_poison_ops = {
Jeff Mahoneycac36f72010-04-23 13:17:37 -0400981 .d_revalidate = xattr_hide_revalidate,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982};
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700983
Al Viroedcc37a2009-05-03 06:00:05 -0400984int reiserfs_lookup_privroot(struct super_block *s)
985{
986 struct dentry *dentry;
987 int err = 0;
988
989 /* If we don't have the privroot located yet - go find it */
Frederic Weisbeckerc72e0572009-05-16 18:12:08 +0200990 reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s);
Al Viroedcc37a2009-05-03 06:00:05 -0400991 dentry = lookup_one_len(PRIVROOT_NAME, s->s_root,
992 strlen(PRIVROOT_NAME));
993 if (!IS_ERR(dentry)) {
994 REISERFS_SB(s)->priv_root = dentry;
Nick Pigginfb045ad2011-01-07 17:49:55 +1100995 d_set_d_op(dentry, &xattr_lookup_poison_ops);
Al Viroedcc37a2009-05-03 06:00:05 -0400996 if (dentry->d_inode)
997 dentry->d_inode->i_flags |= S_PRIVATE;
998 } else
999 err = PTR_ERR(dentry);
1000 mutex_unlock(&s->s_root->d_inode->i_mutex);
1001
1002 return err;
1003}
1004
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005/* We need to take a copy of the mount flags since things like
1006 * MS_RDONLY don't get set until *after* we're called.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 * mount_flags != mount_options */
1008int reiserfs_xattr_init(struct super_block *s, int mount_flags)
1009{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001010 int err = 0;
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001011 struct dentry *privroot = REISERFS_SB(s)->priv_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012
Jeff Mahoneya72bdb12009-03-30 14:02:33 -04001013 err = xattr_mount_check(s);
1014 if (err)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001015 goto error;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001016
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001017 if (!privroot->d_inode && !(mount_flags & MS_RDONLY)) {
Frederic Weisbeckerae635c02009-08-25 02:24:45 +02001018 reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s);
Al Viroedcc37a2009-05-03 06:00:05 -04001019 err = create_privroot(REISERFS_SB(s)->priv_root);
Jeff Mahoney5a6059c2009-05-01 12:11:12 -04001020 mutex_unlock(&s->s_root->d_inode->i_mutex);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001021 }
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001022
1023 if (privroot->d_inode) {
Jeff Mahoney48b32a32009-03-30 14:02:38 -04001024 s->s_xattr = reiserfs_xattr_handlers;
Frederic Weisbeckerc72e0572009-05-16 18:12:08 +02001025 reiserfs_mutex_lock_safe(&privroot->d_inode->i_mutex, s);
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001026 if (!REISERFS_SB(s)->xattr_root) {
1027 struct dentry *dentry;
1028 dentry = lookup_one_len(XAROOT_NAME, privroot,
1029 strlen(XAROOT_NAME));
1030 if (!IS_ERR(dentry))
1031 REISERFS_SB(s)->xattr_root = dentry;
1032 else
1033 err = PTR_ERR(dentry);
1034 }
1035 mutex_unlock(&privroot->d_inode->i_mutex);
1036 }
Jeff Mahoney48b32a32009-03-30 14:02:38 -04001037
Jeff Mahoneya72bdb12009-03-30 14:02:33 -04001038error:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001039 if (err) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001040 clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt));
1041 clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt));
1042 }
1043
1044 /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001045 if (reiserfs_posixacl(s))
1046 s->s_flags |= MS_POSIXACL;
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001047 else
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001048 s->s_flags &= ~MS_POSIXACL;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001049
1050 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051}