blob: 47d2a4498b039cc0fa6c397ec1defd4f65c0db11 [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 dentry_unhash(dentry);
102 error = dir->i_op->rmdir(dir, dentry);
103 if (!error)
104 dentry->d_inode->i_flags |= S_DEAD;
105 mutex_unlock(&dentry->d_inode->i_mutex);
106 if (!error)
107 d_delete(dentry);
108 dput(dentry);
109
110 return error;
111}
112
Jeff Mahoney6c176752009-03-30 14:02:34 -0400113#define xattr_may_create(flags) (!flags || flags & XATTR_CREATE)
114
Jeff Mahoney6c176752009-03-30 14:02:34 -0400115static struct dentry *open_xa_root(struct super_block *sb, int flags)
116{
117 struct dentry *privroot = REISERFS_SB(sb)->priv_root;
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400118 struct dentry *xaroot;
119 if (!privroot->d_inode)
Jeff Mahoney6c176752009-03-30 14:02:34 -0400120 return ERR_PTR(-ENODATA);
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400121
122 mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR);
123
124 xaroot = dget(REISERFS_SB(sb)->xattr_root);
Jeff Mahoneyceb5edc2009-05-17 01:02:02 -0400125 if (!xaroot)
126 xaroot = ERR_PTR(-ENODATA);
127 else if (!xaroot->d_inode) {
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400128 int err = -ENODATA;
129 if (xattr_may_create(flags))
130 err = xattr_mkdir(privroot->d_inode, xaroot, 0700);
131 if (err) {
132 dput(xaroot);
133 xaroot = ERR_PTR(err);
134 }
135 }
136
137 mutex_unlock(&privroot->d_inode->i_mutex);
138 return xaroot;
Jeff Mahoney6c176752009-03-30 14:02:34 -0400139}
140
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700141static struct dentry *open_xa_dir(const struct inode *inode, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700143 struct dentry *xaroot, *xadir;
144 char namebuf[17];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
Jeff Mahoney6c176752009-03-30 14:02:34 -0400146 xaroot = open_xa_root(inode->i_sb, flags);
Jeff Mahoney9b7f3752007-04-23 14:41:17 -0700147 if (IS_ERR(xaroot))
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700148 return xaroot;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700150 snprintf(namebuf, sizeof(namebuf), "%X.%X",
151 le32_to_cpu(INODE_PKEY(inode)->k_objectid),
152 inode->i_generation);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400154 mutex_lock_nested(&xaroot->d_inode->i_mutex, I_MUTEX_XATTR);
155
156 xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf));
157 if (!IS_ERR(xadir) && !xadir->d_inode) {
158 int err = -ENODATA;
159 if (xattr_may_create(flags))
160 err = xattr_mkdir(xaroot->d_inode, xadir, 0700);
161 if (err) {
162 dput(xadir);
163 xadir = ERR_PTR(err);
164 }
165 }
166
167 mutex_unlock(&xaroot->d_inode->i_mutex);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700168 dput(xaroot);
169 return xadir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170}
171
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400172/* The following are side effects of other operations that aren't explicitly
173 * modifying extended attributes. This includes operations such as permissions
174 * or ownership changes, object deletions, etc. */
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400175struct reiserfs_dentry_buf {
176 struct dentry *xadir;
177 int count;
178 struct dentry *dentries[8];
179};
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400180
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400181static int
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400182fill_with_dentries(void *buf, const char *name, int namelen, loff_t offset,
183 u64 ino, unsigned int d_type)
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400184{
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400185 struct reiserfs_dentry_buf *dbuf = buf;
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400186 struct dentry *dentry;
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400187 WARN_ON_ONCE(!mutex_is_locked(&dbuf->xadir->d_inode->i_mutex));
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400188
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400189 if (dbuf->count == ARRAY_SIZE(dbuf->dentries))
190 return -ENOSPC;
191
192 if (name[0] == '.' && (name[1] == '\0' ||
193 (name[1] == '.' && name[2] == '\0')))
194 return 0;
195
196 dentry = lookup_one_len(name, dbuf->xadir, namelen);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400197 if (IS_ERR(dentry)) {
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400198 return PTR_ERR(dentry);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400199 } else if (!dentry->d_inode) {
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400200 /* A directory entry exists, but no file? */
201 reiserfs_error(dentry->d_sb, "xattr-20003",
202 "Corrupted directory: xattr %s listed but "
203 "not found for file %s.\n",
204 dentry->d_name.name, dbuf->xadir->d_name.name);
205 dput(dentry);
206 return -EIO;
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400207 }
208
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400209 dbuf->dentries[dbuf->count++] = dentry;
210 return 0;
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400211}
212
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400213static void
214cleanup_dentry_buf(struct reiserfs_dentry_buf *buf)
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400215{
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400216 int i;
217 for (i = 0; i < buf->count; i++)
218 if (buf->dentries[i])
219 dput(buf->dentries[i]);
220}
221
222static int reiserfs_for_each_xattr(struct inode *inode,
223 int (*action)(struct dentry *, void *),
224 void *data)
225{
226 struct dentry *dir;
227 int i, err = 0;
228 loff_t pos = 0;
229 struct reiserfs_dentry_buf buf = {
230 .count = 0,
231 };
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400232
233 /* Skip out, an xattr has no xattrs associated with it */
234 if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1)
235 return 0;
236
Frederic Weisbecker27026a02009-12-30 05:06:21 +0100237 reiserfs_write_unlock(inode->i_sb);
Jeff Mahoney6c176752009-03-30 14:02:34 -0400238 dir = open_xa_dir(inode, XATTR_REPLACE);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400239 if (IS_ERR(dir)) {
240 err = PTR_ERR(dir);
Frederic Weisbecker27026a02009-12-30 05:06:21 +0100241 reiserfs_write_lock(inode->i_sb);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400242 goto out;
243 } else if (!dir->d_inode) {
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400244 err = 0;
Frederic Weisbecker27026a02009-12-30 05:06:21 +0100245 reiserfs_write_lock(inode->i_sb);
Jeff Mahoney6c176752009-03-30 14:02:34 -0400246 goto out_dir;
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400247 }
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400248
Jeff Mahoney6c176752009-03-30 14:02:34 -0400249 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR);
Frederic Weisbecker27026a02009-12-30 05:06:21 +0100250
251 reiserfs_write_lock(inode->i_sb);
252
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400253 buf.xadir = dir;
254 err = reiserfs_readdir_dentry(dir, &buf, fill_with_dentries, &pos);
255 while ((err == 0 || err == -ENOSPC) && buf.count) {
256 err = 0;
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400257
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400258 for (i = 0; i < buf.count && buf.dentries[i]; i++) {
259 int lerr = 0;
260 struct dentry *dentry = buf.dentries[i];
261
262 if (err == 0 && !S_ISDIR(dentry->d_inode->i_mode))
263 lerr = action(dentry, data);
264
265 dput(dentry);
266 buf.dentries[i] = NULL;
267 err = lerr ?: err;
268 }
269 buf.count = 0;
270 if (!err)
271 err = reiserfs_readdir_dentry(dir, &buf,
272 fill_with_dentries, &pos);
273 }
Jeff Mahoney6c176752009-03-30 14:02:34 -0400274 mutex_unlock(&dir->d_inode->i_mutex);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400275
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400276 /* Clean up after a failed readdir */
277 cleanup_dentry_buf(&buf);
278
279 if (!err) {
280 /* We start a transaction here to avoid a ABBA situation
281 * between the xattr root's i_mutex and the journal lock.
282 * This doesn't incur much additional overhead since the
283 * new transaction will just nest inside the
284 * outer transaction. */
285 int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 +
286 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb);
287 struct reiserfs_transaction_handle th;
288 err = journal_begin(&th, inode->i_sb, blocks);
289 if (!err) {
290 int jerror;
Frederic Weisbecker8b513f52009-12-30 07:28:58 +0100291 reiserfs_mutex_lock_nested_safe(
292 &dir->d_parent->d_inode->i_mutex,
293 I_MUTEX_XATTR, inode->i_sb);
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400294 err = action(dir, data);
295 jerror = journal_end(&th, inode->i_sb, blocks);
296 mutex_unlock(&dir->d_parent->d_inode->i_mutex);
297 err = jerror ?: err;
298 }
299 }
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400300out_dir:
301 dput(dir);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400302out:
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400303 /* -ENODATA isn't an error */
304 if (err == -ENODATA)
305 err = 0;
306 return err;
307}
308
309static int delete_one_xattr(struct dentry *dentry, void *data)
310{
311 struct inode *dir = dentry->d_parent->d_inode;
312
313 /* This is the xattr dir, handle specially. */
314 if (S_ISDIR(dentry->d_inode->i_mode))
315 return xattr_rmdir(dir, dentry);
316
317 return xattr_unlink(dir, dentry);
318}
319
320static int chown_one_xattr(struct dentry *dentry, void *data)
321{
322 struct iattr *attrs = data;
323 return reiserfs_setattr(dentry, attrs);
324}
325
326/* No i_mutex, but the inode is unconnected. */
327int reiserfs_delete_xattrs(struct inode *inode)
328{
329 int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL);
330 if (err)
331 reiserfs_warning(inode->i_sb, "jdm-20004",
332 "Couldn't delete all xattrs (%d)\n", err);
333 return err;
334}
335
336/* inode->i_mutex: down */
337int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs)
338{
339 int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs);
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400340 if (err)
341 reiserfs_warning(inode->i_sb, "jdm-20007",
342 "Couldn't chown all xattrs (%d)\n", err);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400343 return err;
344}
345
346#ifdef CONFIG_REISERFS_FS_XATTR
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347/* Returns a dentry corresponding to a specific extended attribute file
348 * for the inode. If flags allow, the file is created. Otherwise, a
349 * valid or negative dentry, or an error is returned. */
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400350static struct dentry *xattr_lookup(struct inode *inode, const char *name,
351 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700353 struct dentry *xadir, *xafile;
354 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700356 xadir = open_xa_dir(inode, flags);
Jeff Mahoney6c176752009-03-30 14:02:34 -0400357 if (IS_ERR(xadir))
David Howellse231c2e2008-02-07 00:15:26 -0800358 return ERR_CAST(xadir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400360 mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700361 xafile = lookup_one_len(name, xadir, strlen(name));
362 if (IS_ERR(xafile)) {
Jeff Mahoney6c176752009-03-30 14:02:34 -0400363 err = PTR_ERR(xafile);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700364 goto out;
Jeff Mahoney6c176752009-03-30 14:02:34 -0400365 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
Jeff Mahoney6c176752009-03-30 14:02:34 -0400367 if (xafile->d_inode && (flags & XATTR_CREATE))
368 err = -EEXIST;
369
370 if (!xafile->d_inode) {
371 err = -ENODATA;
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400372 if (xattr_may_create(flags))
Jeff Mahoney6c176752009-03-30 14:02:34 -0400373 err = xattr_create(xadir->d_inode, xafile,
374 0700|S_IFREG);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700375 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376
Jeff Mahoney6c176752009-03-30 14:02:34 -0400377 if (err)
378 dput(xafile);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400379out:
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400380 mutex_unlock(&xadir->d_inode->i_mutex);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700381 dput(xadir);
382 if (err)
Jeff Mahoney6c176752009-03-30 14:02:34 -0400383 return ERR_PTR(err);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800384 return xafile;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385}
386
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387/* Internal operations on file data */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700388static inline void reiserfs_put_page(struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700390 kunmap(page);
391 page_cache_release(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392}
393
Jeff Mahoneyec6ea562009-03-30 14:02:30 -0400394static struct page *reiserfs_get_page(struct inode *dir, size_t n)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700396 struct address_space *mapping = dir->i_mapping;
397 struct page *page;
398 /* We can deadlock if we try to free dentries,
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300399 and an unlink/rmdir has just occurred - GFP_NOFS avoids this */
Al Viroc4cdd032005-10-21 03:22:39 -0400400 mapping_set_gfp_mask(mapping, GFP_NOFS);
Jeff Mahoneyec6ea562009-03-30 14:02:30 -0400401 page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700402 if (!IS_ERR(page)) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700403 kmap(page);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700404 if (PageError(page))
405 goto fail;
406 }
407 return page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700409 fail:
410 reiserfs_put_page(page);
411 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412}
413
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700414static inline __u32 xattr_hash(const char *msg, int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700416 return csum_partial(msg, len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417}
418
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -0700419int reiserfs_commit_write(struct file *f, struct page *page,
420 unsigned from, unsigned to);
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -0700421
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400422static void update_ctime(struct inode *inode)
423{
424 struct timespec now = current_fs_time(inode->i_sb);
Al Viro1d3382cb2010-10-23 15:19:20 -0400425 if (inode_unhashed(inode) || !inode->i_nlink ||
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400426 timespec_equal(&inode->i_ctime, &now))
427 return;
428
429 inode->i_ctime = CURRENT_TIME_SEC;
430 mark_inode_dirty(inode);
431}
432
433static int lookup_and_delete_xattr(struct inode *inode, const char *name)
434{
435 int err = 0;
436 struct dentry *dentry, *xadir;
437
438 xadir = open_xa_dir(inode, XATTR_REPLACE);
439 if (IS_ERR(xadir))
440 return PTR_ERR(xadir);
441
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400442 mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400443 dentry = lookup_one_len(name, xadir, strlen(name));
444 if (IS_ERR(dentry)) {
445 err = PTR_ERR(dentry);
446 goto out_dput;
447 }
448
449 if (dentry->d_inode) {
Frederic Weisbecker4f3be1b2010-01-05 02:14:30 +0100450 reiserfs_write_lock(inode->i_sb);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400451 err = xattr_unlink(xadir->d_inode, dentry);
Frederic Weisbecker4f3be1b2010-01-05 02:14:30 +0100452 reiserfs_write_unlock(inode->i_sb);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400453 update_ctime(inode);
454 }
455
456 dput(dentry);
457out_dput:
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400458 mutex_unlock(&xadir->d_inode->i_mutex);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400459 dput(xadir);
460 return err;
461}
462
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -0700463
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464/* Generic extended attribute operations that can be used by xa plugins */
465
466/*
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800467 * inode->i_mutex: down
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 */
469int
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400470reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th,
471 struct inode *inode, const char *name,
472 const void *buffer, size_t buffer_size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700474 int err = 0;
Jeff Mahoney3227e142008-02-15 14:37:22 -0800475 struct dentry *dentry;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700476 struct page *page;
477 char *data;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700478 size_t file_pos = 0;
479 size_t buffer_pos = 0;
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400480 size_t new_size;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700481 __u32 xahash = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700483 if (get_inode_sd_version(inode) == STAT_DATA_V1)
484 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
Frederic Weisbecker3f14fea2009-12-30 07:03:53 +0100486 reiserfs_write_unlock(inode->i_sb);
Frederic Weisbecker4f3be1b2010-01-05 02:14:30 +0100487
488 if (!buffer) {
489 err = lookup_and_delete_xattr(inode, name);
490 reiserfs_write_lock(inode->i_sb);
491 return err;
492 }
493
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400494 dentry = xattr_lookup(inode, name, flags);
Frederic Weisbecker3f14fea2009-12-30 07:03:53 +0100495 if (IS_ERR(dentry)) {
496 reiserfs_write_lock(inode->i_sb);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400497 return PTR_ERR(dentry);
Frederic Weisbecker3f14fea2009-12-30 07:03:53 +0100498 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
Frederic Weisbeckerf3e22f42010-01-03 03:44:53 +0100500 down_write(&REISERFS_I(inode)->i_xattr_sem);
Frederic Weisbecker3f14fea2009-12-30 07:03:53 +0100501
502 reiserfs_write_lock(inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400504 xahash = xattr_hash(buffer, buffer_size);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700505 while (buffer_pos < buffer_size || buffer_pos == 0) {
506 size_t chunk;
507 size_t skip = 0;
508 size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1));
509 if (buffer_size - buffer_pos > PAGE_CACHE_SIZE)
510 chunk = PAGE_CACHE_SIZE;
511 else
512 chunk = buffer_size - buffer_pos;
513
Jeff Mahoneyec6ea562009-03-30 14:02:30 -0400514 page = reiserfs_get_page(dentry->d_inode, file_pos);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700515 if (IS_ERR(page)) {
516 err = PTR_ERR(page);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400517 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700518 }
519
520 lock_page(page);
521 data = page_address(page);
522
523 if (file_pos == 0) {
524 struct reiserfs_xattr_header *rxh;
525 skip = file_pos = sizeof(struct reiserfs_xattr_header);
526 if (chunk + skip > PAGE_CACHE_SIZE)
527 chunk = PAGE_CACHE_SIZE - skip;
528 rxh = (struct reiserfs_xattr_header *)data;
529 rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC);
530 rxh->h_hash = cpu_to_le32(xahash);
531 }
532
Christoph Hellwigebdec242010-10-06 10:47:23 +0200533 err = __reiserfs_write_begin(page, page_offset, chunk + skip);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700534 if (!err) {
535 if (buffer)
536 memcpy(data + skip, buffer + buffer_pos, chunk);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800537 err = reiserfs_commit_write(NULL, page, page_offset,
538 page_offset + chunk +
539 skip);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700540 }
541 unlock_page(page);
542 reiserfs_put_page(page);
543 buffer_pos += chunk;
544 file_pos += chunk;
545 skip = 0;
546 if (err || buffer_size == 0 || !buffer)
547 break;
548 }
549
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400550 new_size = buffer_size + sizeof(struct reiserfs_xattr_header);
551 if (!err && new_size < i_size_read(dentry->d_inode)) {
552 struct iattr newattrs = {
553 .ia_ctime = current_fs_time(inode->i_sb),
Jeff Mahoneyfb2162d2010-04-23 13:17:41 -0400554 .ia_size = new_size,
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400555 .ia_valid = ATTR_SIZE | ATTR_CTIME,
556 };
Frederic Weisbecker31370f62010-01-07 15:55:31 +0100557
558 reiserfs_write_unlock(inode->i_sb);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400559 mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR);
560 down_write(&dentry->d_inode->i_alloc_sem);
Frederic Weisbecker31370f62010-01-07 15:55:31 +0100561 reiserfs_write_lock(inode->i_sb);
562
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400563 err = reiserfs_setattr(dentry, &newattrs);
564 up_write(&dentry->d_inode->i_alloc_sem);
565 mutex_unlock(&dentry->d_inode->i_mutex);
566 } else
567 update_ctime(inode);
568out_unlock:
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400569 up_write(&REISERFS_I(inode)->i_xattr_sem);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800570 dput(dentry);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400571 return err;
572}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700573
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400574/* We need to start a transaction to maintain lock ordering */
575int reiserfs_xattr_set(struct inode *inode, const char *name,
576 const void *buffer, size_t buffer_size, int flags)
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400577{
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400578
579 struct reiserfs_transaction_handle th;
580 int error, error2;
581 size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size);
582
583 if (!(flags & XATTR_REPLACE))
584 jbegin_count += reiserfs_xattr_jcreate_nblocks(inode);
585
586 reiserfs_write_lock(inode->i_sb);
587 error = journal_begin(&th, inode->i_sb, jbegin_count);
588 if (error) {
589 reiserfs_write_unlock(inode->i_sb);
590 return error;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700591 }
592
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400593 error = reiserfs_xattr_set_handle(&th, inode, name,
594 buffer, buffer_size, flags);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700595
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400596 error2 = journal_end(&th, inode->i_sb, jbegin_count);
597 if (error == 0)
598 error = error2;
599 reiserfs_write_unlock(inode->i_sb);
600
601 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602}
603
604/*
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800605 * inode->i_mutex: down
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 */
607int
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400608reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700609 size_t buffer_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700611 ssize_t err = 0;
Jeff Mahoney3227e142008-02-15 14:37:22 -0800612 struct dentry *dentry;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700613 size_t isize;
614 size_t file_pos = 0;
615 size_t buffer_pos = 0;
616 struct page *page;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700617 __u32 hash = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700619 if (name == NULL)
620 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700622 /* We can't have xattrs attached to v1 items since they don't have
623 * generation numbers */
624 if (get_inode_sd_version(inode) == STAT_DATA_V1)
625 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400627 dentry = xattr_lookup(inode, name, XATTR_REPLACE);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800628 if (IS_ERR(dentry)) {
629 err = PTR_ERR(dentry);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700630 goto out;
631 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400633 down_read(&REISERFS_I(inode)->i_xattr_sem);
Jeff Mahoneyd9845612009-03-30 14:02:35 -0400634
Jeff Mahoneyf437c522009-03-30 14:02:29 -0400635 isize = i_size_read(dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700637 /* Just return the size needed */
638 if (buffer == NULL) {
639 err = isize - sizeof(struct reiserfs_xattr_header);
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400640 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700641 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700643 if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) {
644 err = -ERANGE;
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400645 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700646 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700648 while (file_pos < isize) {
649 size_t chunk;
650 char *data;
651 size_t skip = 0;
652 if (isize - file_pos > PAGE_CACHE_SIZE)
653 chunk = PAGE_CACHE_SIZE;
654 else
655 chunk = isize - file_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656
Jeff Mahoneyec6ea562009-03-30 14:02:30 -0400657 page = reiserfs_get_page(dentry->d_inode, file_pos);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700658 if (IS_ERR(page)) {
659 err = PTR_ERR(page);
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400660 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700661 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700663 lock_page(page);
664 data = page_address(page);
665 if (file_pos == 0) {
666 struct reiserfs_xattr_header *rxh =
667 (struct reiserfs_xattr_header *)data;
668 skip = file_pos = sizeof(struct reiserfs_xattr_header);
669 chunk -= skip;
670 /* Magic doesn't match up.. */
671 if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) {
672 unlock_page(page);
673 reiserfs_put_page(page);
Jeff Mahoney45b03d52009-03-30 14:02:21 -0400674 reiserfs_warning(inode->i_sb, "jdm-20001",
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700675 "Invalid magic for xattr (%s) "
676 "associated with %k", name,
677 INODE_PKEY(inode));
678 err = -EIO;
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400679 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700680 }
681 hash = le32_to_cpu(rxh->h_hash);
682 }
683 memcpy(buffer + buffer_pos, data + skip, chunk);
684 unlock_page(page);
685 reiserfs_put_page(page);
686 file_pos += chunk;
687 buffer_pos += chunk;
688 skip = 0;
689 }
690 err = isize - sizeof(struct reiserfs_xattr_header);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700692 if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) !=
693 hash) {
Jeff Mahoney45b03d52009-03-30 14:02:21 -0400694 reiserfs_warning(inode->i_sb, "jdm-20002",
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700695 "Invalid hash for xattr (%s) associated "
696 "with %k", name, INODE_PKEY(inode));
697 err = -EIO;
698 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400700out_unlock:
701 up_read(&REISERFS_I(inode)->i_xattr_sem);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800702 dput(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400704out:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700705 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706}
707
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400708/*
709 * In order to implement different sets of xattr operations for each xattr
710 * prefix with the generic xattr API, a filesystem should create a
711 * null-terminated array of struct xattr_handler (one for each prefix) and
712 * hang a pointer to it off of the s_xattr field of the superblock.
713 *
714 * The generic_fooxattr() functions will use this list to dispatch xattr
715 * operations to the correct xattr_handler.
716 */
717#define for_each_xattr_handler(handlers, handler) \
718 for ((handler) = *(handlers)++; \
719 (handler) != NULL; \
720 (handler) = *(handlers)++)
721
722/* This is the implementation for the xattr plugin infrastructure */
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700723static inline const struct xattr_handler *
724find_xattr_handler_prefix(const struct xattr_handler **handlers,
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400725 const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726{
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700727 const struct xattr_handler *xah;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400729 if (!handlers)
730 return NULL;
731
732 for_each_xattr_handler(handlers, xah) {
733 if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0)
734 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 }
736
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400737 return xah;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738}
739
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740
741/*
742 * Inode operation getxattr()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 */
744ssize_t
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700745reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer,
746 size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747{
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700748 const struct xattr_handler *handler;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749
Christoph Hellwig431547b2009-11-13 09:52:56 +0000750 handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400751
Christoph Hellwig431547b2009-11-13 09:52:56 +0000752 if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700753 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754
Christoph Hellwig431547b2009-11-13 09:52:56 +0000755 return handler->get(dentry, name, buffer, size, handler->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756}
757
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758/*
759 * Inode operation setxattr()
760 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800761 * dentry->d_inode->i_mutex down
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 */
763int
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700764reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value,
765 size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766{
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700767 const struct xattr_handler *handler;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768
Christoph Hellwig431547b2009-11-13 09:52:56 +0000769 handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400770
Christoph Hellwig431547b2009-11-13 09:52:56 +0000771 if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700772 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773
Christoph Hellwig431547b2009-11-13 09:52:56 +0000774 return handler->set(dentry, name, value, size, flags, handler->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775}
776
777/*
778 * Inode operation removexattr()
779 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800780 * dentry->d_inode->i_mutex down
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700782int reiserfs_removexattr(struct dentry *dentry, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783{
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700784 const struct xattr_handler *handler;
Christoph Hellwig431547b2009-11-13 09:52:56 +0000785 handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786
Christoph Hellwig431547b2009-11-13 09:52:56 +0000787 if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700788 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789
Christoph Hellwig431547b2009-11-13 09:52:56 +0000790 return handler->set(dentry, name, NULL, 0, XATTR_REPLACE, handler->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791}
792
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400793struct listxattr_buf {
794 size_t size;
795 size_t pos;
796 char *buf;
Christoph Hellwig431547b2009-11-13 09:52:56 +0000797 struct dentry *dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798};
799
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400800static int listxattr_filler(void *buf, const char *name, int namelen,
801 loff_t offset, u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802{
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400803 struct listxattr_buf *b = (struct listxattr_buf *)buf;
804 size_t size;
805 if (name[0] != '.' ||
806 (namelen != 1 && (name[1] != '.' || namelen != 2))) {
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700807 const struct xattr_handler *handler;
Christoph Hellwig431547b2009-11-13 09:52:56 +0000808 handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr,
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400809 name);
810 if (!handler) /* Unsupported xattr name */
811 return 0;
812 if (b->buf) {
Christoph Hellwig431547b2009-11-13 09:52:56 +0000813 size = handler->list(b->dentry, b->buf + b->pos,
814 b->size, name, namelen,
815 handler->flags);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400816 if (size > b->size)
817 return -ERANGE;
818 } else {
Christoph Hellwig431547b2009-11-13 09:52:56 +0000819 size = handler->list(b->dentry, NULL, 0, name,
820 namelen, handler->flags);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700821 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400823 b->pos += size;
824 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700825 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700827
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828/*
829 * Inode operation listxattr()
830 *
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400831 * We totally ignore the generic listxattr here because it would be stupid
832 * not to. Since the xattrs are organized in a directory, we can just
833 * readdir to find them.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700835ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700837 struct dentry *dir;
838 int err = 0;
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400839 loff_t pos = 0;
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400840 struct listxattr_buf buf = {
Christoph Hellwig431547b2009-11-13 09:52:56 +0000841 .dentry = dentry,
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400842 .buf = buffer,
843 .size = buffer ? size : 0,
844 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700846 if (!dentry->d_inode)
847 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848
Jeff Mahoney677c9b22009-05-05 15:30:17 -0400849 if (!dentry->d_sb->s_xattr ||
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700850 get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
851 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
Jeff Mahoney6c176752009-03-30 14:02:34 -0400853 dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700854 if (IS_ERR(dir)) {
855 err = PTR_ERR(dir);
856 if (err == -ENODATA)
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400857 err = 0; /* Not an error if there aren't any xattrs */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700858 goto out;
859 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860
Jeff Mahoney6c176752009-03-30 14:02:34 -0400861 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR);
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400862 err = reiserfs_readdir_dentry(dir, &buf, listxattr_filler, &pos);
Jeff Mahoney6c176752009-03-30 14:02:34 -0400863 mutex_unlock(&dir->d_inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400865 if (!err)
866 err = buf.pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867
Jeff Mahoney3227e142008-02-15 14:37:22 -0800868 dput(dir);
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400869out:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700870 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871}
872
Nick Pigginb74c79e2011-01-07 17:49:58 +1100873static int reiserfs_check_acl(struct inode *inode, int mask, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874{
Christoph Hellwigec191572006-02-01 03:06:46 -0800875 struct posix_acl *acl;
876 int error = -EAGAIN; /* do regular unix permission checks by default */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700877
Nick Pigginb74c79e2011-01-07 17:49:58 +1100878 if (flags & IPERM_FLAG_RCU)
879 return -ECHILD;
880
Christoph Hellwigec191572006-02-01 03:06:46 -0800881 acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
882
Christoph Hellwigec191572006-02-01 03:06:46 -0800883 if (acl) {
884 if (!IS_ERR(acl)) {
885 error = posix_acl_permission(inode, acl, mask);
886 posix_acl_release(acl);
887 } else if (PTR_ERR(acl) != -ENODATA)
888 error = PTR_ERR(acl);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700889 }
890
Christoph Hellwigec191572006-02-01 03:06:46 -0800891 return error;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700892}
893
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400894static int create_privroot(struct dentry *dentry)
895{
896 int err;
897 struct inode *inode = dentry->d_parent->d_inode;
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400898 WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex));
899
Jeff Mahoney6c176752009-03-30 14:02:34 -0400900 err = xattr_mkdir(inode, dentry, 0700);
Al Viroedcc37a2009-05-03 06:00:05 -0400901 if (err || !dentry->d_inode) {
902 reiserfs_warning(dentry->d_sb, "jdm-20006",
903 "xattrs/ACLs enabled and couldn't "
904 "find/create .reiserfs_priv. "
905 "Failing mount.");
906 return -EOPNOTSUPP;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700907 }
908
Al Viroedcc37a2009-05-03 06:00:05 -0400909 dentry->d_inode->i_flags |= S_PRIVATE;
910 reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr "
911 "storage.\n", PRIVROOT_NAME);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700912
Al Viroedcc37a2009-05-03 06:00:05 -0400913 return 0;
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400914}
915
Jeff Mahoney12abb352009-05-17 01:02:01 -0400916#else
917int __init reiserfs_xattr_register_handlers(void) { return 0; }
918void reiserfs_xattr_unregister_handlers(void) {}
919static int create_privroot(struct dentry *dentry) { return 0; }
920#endif
921
922/* Actual operations that are exported to VFS-land */
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700923const struct xattr_handler *reiserfs_xattr_handlers[] = {
Jeff Mahoney12abb352009-05-17 01:02:01 -0400924#ifdef CONFIG_REISERFS_FS_XATTR
925 &reiserfs_xattr_user_handler,
926 &reiserfs_xattr_trusted_handler,
927#endif
928#ifdef CONFIG_REISERFS_FS_SECURITY
929 &reiserfs_xattr_security_handler,
930#endif
931#ifdef CONFIG_REISERFS_FS_POSIX_ACL
932 &reiserfs_posix_acl_access_handler,
933 &reiserfs_posix_acl_default_handler,
934#endif
935 NULL
936};
937
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400938static int xattr_mount_check(struct super_block *s)
939{
940 /* We need generation numbers to ensure that the oid mapping is correct
941 * v3.5 filesystems don't have them. */
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400942 if (old_format_only(s)) {
943 if (reiserfs_xattrs_optional(s)) {
944 /* Old format filesystem, but optional xattrs have
945 * been enabled. Error out. */
946 reiserfs_warning(s, "jdm-2005",
947 "xattrs/ACLs not supported "
948 "on pre-v3.6 format filesystems. "
949 "Failing mount.");
950 return -EOPNOTSUPP;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700951 }
952 }
953
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400954 return 0;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700955}
956
Nick Pigginb74c79e2011-01-07 17:49:58 +1100957int reiserfs_permission(struct inode *inode, int mask, unsigned int flags)
Jeff Mahoneyb83674c2009-05-17 01:02:03 -0400958{
Nick Pigginb74c79e2011-01-07 17:49:58 +1100959 if (flags & IPERM_FLAG_RCU)
960 return -ECHILD;
Jeff Mahoneyb83674c2009-05-17 01:02:03 -0400961 /*
962 * We don't do permission checks on the internal objects.
963 * Permissions are determined by the "owning" object.
964 */
965 if (IS_PRIVATE(inode))
966 return 0;
967
968#ifdef CONFIG_REISERFS_FS_XATTR
969 /*
970 * Stat data v1 doesn't support ACLs.
971 */
972 if (get_inode_sd_version(inode) != STAT_DATA_V1)
Nick Pigginb74c79e2011-01-07 17:49:58 +1100973 return generic_permission(inode, mask, flags,
974 reiserfs_check_acl);
Jeff Mahoneyb83674c2009-05-17 01:02:03 -0400975#endif
Nick Pigginb74c79e2011-01-07 17:49:58 +1100976 return generic_permission(inode, mask, flags, NULL);
Jeff Mahoneyb83674c2009-05-17 01:02:03 -0400977}
978
Jeff Mahoneycac36f72010-04-23 13:17:37 -0400979static int xattr_hide_revalidate(struct dentry *dentry, struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980{
Jeff Mahoneycac36f72010-04-23 13:17:37 -0400981 return -EPERM;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700982}
983
Al Viroe16404e2009-02-20 05:55:13 +0000984static const struct dentry_operations xattr_lookup_poison_ops = {
Jeff Mahoneycac36f72010-04-23 13:17:37 -0400985 .d_revalidate = xattr_hide_revalidate,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986};
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700987
Al Viroedcc37a2009-05-03 06:00:05 -0400988int reiserfs_lookup_privroot(struct super_block *s)
989{
990 struct dentry *dentry;
991 int err = 0;
992
993 /* If we don't have the privroot located yet - go find it */
Frederic Weisbeckerc72e0572009-05-16 18:12:08 +0200994 reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s);
Al Viroedcc37a2009-05-03 06:00:05 -0400995 dentry = lookup_one_len(PRIVROOT_NAME, s->s_root,
996 strlen(PRIVROOT_NAME));
997 if (!IS_ERR(dentry)) {
998 REISERFS_SB(s)->priv_root = dentry;
Nick Pigginfb045ad2011-01-07 17:49:55 +1100999 d_set_d_op(dentry, &xattr_lookup_poison_ops);
Al Viroedcc37a2009-05-03 06:00:05 -04001000 if (dentry->d_inode)
1001 dentry->d_inode->i_flags |= S_PRIVATE;
1002 } else
1003 err = PTR_ERR(dentry);
1004 mutex_unlock(&s->s_root->d_inode->i_mutex);
1005
1006 return err;
1007}
1008
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009/* We need to take a copy of the mount flags since things like
1010 * MS_RDONLY don't get set until *after* we're called.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 * mount_flags != mount_options */
1012int reiserfs_xattr_init(struct super_block *s, int mount_flags)
1013{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001014 int err = 0;
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001015 struct dentry *privroot = REISERFS_SB(s)->priv_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016
Jeff Mahoneya72bdb12009-03-30 14:02:33 -04001017 err = xattr_mount_check(s);
1018 if (err)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001019 goto error;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001020
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001021 if (!privroot->d_inode && !(mount_flags & MS_RDONLY)) {
Frederic Weisbeckerae635c02009-08-25 02:24:45 +02001022 reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s);
Al Viroedcc37a2009-05-03 06:00:05 -04001023 err = create_privroot(REISERFS_SB(s)->priv_root);
Jeff Mahoney5a6059c2009-05-01 12:11:12 -04001024 mutex_unlock(&s->s_root->d_inode->i_mutex);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001025 }
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001026
1027 if (privroot->d_inode) {
Jeff Mahoney48b32a32009-03-30 14:02:38 -04001028 s->s_xattr = reiserfs_xattr_handlers;
Frederic Weisbeckerc72e0572009-05-16 18:12:08 +02001029 reiserfs_mutex_lock_safe(&privroot->d_inode->i_mutex, s);
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001030 if (!REISERFS_SB(s)->xattr_root) {
1031 struct dentry *dentry;
1032 dentry = lookup_one_len(XAROOT_NAME, privroot,
1033 strlen(XAROOT_NAME));
1034 if (!IS_ERR(dentry))
1035 REISERFS_SB(s)->xattr_root = dentry;
1036 else
1037 err = PTR_ERR(dentry);
1038 }
1039 mutex_unlock(&privroot->d_inode->i_mutex);
1040 }
Jeff Mahoney48b32a32009-03-30 14:02:38 -04001041
Jeff Mahoneya72bdb12009-03-30 14:02:33 -04001042error:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001043 if (err) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001044 clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt));
1045 clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt));
1046 }
1047
1048 /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001049 if (reiserfs_posixacl(s))
1050 s->s_flags |= MS_POSIXACL;
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001051 else
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001052 s->s_flags &= ~MS_POSIXACL;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001053
1054 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055}