blob: c196369fe4083128163ed66707d85cde1c0367fb [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
Al Virof466c6f2012-03-17 01:16:43 -040036#include "reiserfs.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>
Al Viroc45ac882012-03-17 00:59:06 -040046#include "xattr.h"
Al Viroa3063ab2012-03-17 01:03:10 -040047#include "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));
Al Viroebfc3b42012-06-10 18:05:36 -040065 return dir->i_op->create(dir, dentry, mode, true);
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
Al Viro18bb1db2011-07-26 01:41:39 -040069static int xattr_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
Jeff Mahoney6c176752009-03-30 14:02:34 -040070{
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 Viro1d3382cb2010-10-23 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);
Christoph Hellwigbd5fe6c2011-06-24 14:29:43 -0400558 inode_dio_wait(dentry->d_inode);
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);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400562 mutex_unlock(&dentry->d_inode->i_mutex);
563 } else
564 update_ctime(inode);
565out_unlock:
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400566 up_write(&REISERFS_I(inode)->i_xattr_sem);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800567 dput(dentry);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400568 return err;
569}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700570
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400571/* We need to start a transaction to maintain lock ordering */
572int reiserfs_xattr_set(struct inode *inode, const char *name,
573 const void *buffer, size_t buffer_size, int flags)
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400574{
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400575
576 struct reiserfs_transaction_handle th;
577 int error, error2;
578 size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size);
579
580 if (!(flags & XATTR_REPLACE))
581 jbegin_count += reiserfs_xattr_jcreate_nblocks(inode);
582
583 reiserfs_write_lock(inode->i_sb);
584 error = journal_begin(&th, inode->i_sb, jbegin_count);
585 if (error) {
586 reiserfs_write_unlock(inode->i_sb);
587 return error;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700588 }
589
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400590 error = reiserfs_xattr_set_handle(&th, inode, name,
591 buffer, buffer_size, flags);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700592
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400593 error2 = journal_end(&th, inode->i_sb, jbegin_count);
594 if (error == 0)
595 error = error2;
596 reiserfs_write_unlock(inode->i_sb);
597
598 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599}
600
601/*
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800602 * inode->i_mutex: down
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 */
604int
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400605reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700606 size_t buffer_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700608 ssize_t err = 0;
Jeff Mahoney3227e142008-02-15 14:37:22 -0800609 struct dentry *dentry;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700610 size_t isize;
611 size_t file_pos = 0;
612 size_t buffer_pos = 0;
613 struct page *page;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700614 __u32 hash = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700616 if (name == NULL)
617 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700619 /* We can't have xattrs attached to v1 items since they don't have
620 * generation numbers */
621 if (get_inode_sd_version(inode) == STAT_DATA_V1)
622 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400624 dentry = xattr_lookup(inode, name, XATTR_REPLACE);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800625 if (IS_ERR(dentry)) {
626 err = PTR_ERR(dentry);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700627 goto out;
628 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400630 down_read(&REISERFS_I(inode)->i_xattr_sem);
Jeff Mahoneyd9845612009-03-30 14:02:35 -0400631
Jeff Mahoneyf437c522009-03-30 14:02:29 -0400632 isize = i_size_read(dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700634 /* Just return the size needed */
635 if (buffer == NULL) {
636 err = isize - sizeof(struct reiserfs_xattr_header);
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400637 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700638 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700640 if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) {
641 err = -ERANGE;
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400642 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700643 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700645 while (file_pos < isize) {
646 size_t chunk;
647 char *data;
648 size_t skip = 0;
649 if (isize - file_pos > PAGE_CACHE_SIZE)
650 chunk = PAGE_CACHE_SIZE;
651 else
652 chunk = isize - file_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653
Jeff Mahoneyec6ea562009-03-30 14:02:30 -0400654 page = reiserfs_get_page(dentry->d_inode, file_pos);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700655 if (IS_ERR(page)) {
656 err = PTR_ERR(page);
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400657 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700658 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700660 lock_page(page);
661 data = page_address(page);
662 if (file_pos == 0) {
663 struct reiserfs_xattr_header *rxh =
664 (struct reiserfs_xattr_header *)data;
665 skip = file_pos = sizeof(struct reiserfs_xattr_header);
666 chunk -= skip;
667 /* Magic doesn't match up.. */
668 if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) {
669 unlock_page(page);
670 reiserfs_put_page(page);
Jeff Mahoney45b03d52009-03-30 14:02:21 -0400671 reiserfs_warning(inode->i_sb, "jdm-20001",
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700672 "Invalid magic for xattr (%s) "
673 "associated with %k", name,
674 INODE_PKEY(inode));
675 err = -EIO;
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400676 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700677 }
678 hash = le32_to_cpu(rxh->h_hash);
679 }
680 memcpy(buffer + buffer_pos, data + skip, chunk);
681 unlock_page(page);
682 reiserfs_put_page(page);
683 file_pos += chunk;
684 buffer_pos += chunk;
685 skip = 0;
686 }
687 err = isize - sizeof(struct reiserfs_xattr_header);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700689 if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) !=
690 hash) {
Jeff Mahoney45b03d52009-03-30 14:02:21 -0400691 reiserfs_warning(inode->i_sb, "jdm-20002",
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700692 "Invalid hash for xattr (%s) associated "
693 "with %k", name, INODE_PKEY(inode));
694 err = -EIO;
695 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400697out_unlock:
698 up_read(&REISERFS_I(inode)->i_xattr_sem);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800699 dput(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400701out:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700702 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703}
704
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400705/*
706 * In order to implement different sets of xattr operations for each xattr
707 * prefix with the generic xattr API, a filesystem should create a
708 * null-terminated array of struct xattr_handler (one for each prefix) and
709 * hang a pointer to it off of the s_xattr field of the superblock.
710 *
711 * The generic_fooxattr() functions will use this list to dispatch xattr
712 * operations to the correct xattr_handler.
713 */
714#define for_each_xattr_handler(handlers, handler) \
715 for ((handler) = *(handlers)++; \
716 (handler) != NULL; \
717 (handler) = *(handlers)++)
718
719/* This is the implementation for the xattr plugin infrastructure */
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700720static inline const struct xattr_handler *
721find_xattr_handler_prefix(const struct xattr_handler **handlers,
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400722 const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723{
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700724 const struct xattr_handler *xah;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400726 if (!handlers)
727 return NULL;
728
729 for_each_xattr_handler(handlers, xah) {
730 if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0)
731 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 }
733
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400734 return xah;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735}
736
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737
738/*
739 * Inode operation getxattr()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 */
741ssize_t
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700742reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer,
743 size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744{
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700745 const struct xattr_handler *handler;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746
Christoph Hellwig431547b2009-11-13 09:52:56 +0000747 handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400748
Christoph Hellwig431547b2009-11-13 09:52:56 +0000749 if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700750 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751
Christoph Hellwig431547b2009-11-13 09:52:56 +0000752 return handler->get(dentry, name, buffer, size, handler->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753}
754
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755/*
756 * Inode operation setxattr()
757 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800758 * dentry->d_inode->i_mutex down
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 */
760int
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700761reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value,
762 size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763{
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700764 const struct xattr_handler *handler;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765
Christoph Hellwig431547b2009-11-13 09:52:56 +0000766 handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400767
Christoph Hellwig431547b2009-11-13 09:52:56 +0000768 if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700769 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
Christoph Hellwig431547b2009-11-13 09:52:56 +0000771 return handler->set(dentry, name, value, size, flags, handler->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772}
773
774/*
775 * Inode operation removexattr()
776 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800777 * dentry->d_inode->i_mutex down
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700779int reiserfs_removexattr(struct dentry *dentry, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780{
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700781 const struct xattr_handler *handler;
Christoph Hellwig431547b2009-11-13 09:52:56 +0000782 handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783
Christoph Hellwig431547b2009-11-13 09:52:56 +0000784 if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700785 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786
Christoph Hellwig431547b2009-11-13 09:52:56 +0000787 return handler->set(dentry, name, NULL, 0, XATTR_REPLACE, handler->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788}
789
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400790struct listxattr_buf {
791 size_t size;
792 size_t pos;
793 char *buf;
Christoph Hellwig431547b2009-11-13 09:52:56 +0000794 struct dentry *dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795};
796
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400797static int listxattr_filler(void *buf, const char *name, int namelen,
798 loff_t offset, u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799{
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400800 struct listxattr_buf *b = (struct listxattr_buf *)buf;
801 size_t size;
802 if (name[0] != '.' ||
803 (namelen != 1 && (name[1] != '.' || namelen != 2))) {
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700804 const struct xattr_handler *handler;
Christoph Hellwig431547b2009-11-13 09:52:56 +0000805 handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr,
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400806 name);
807 if (!handler) /* Unsupported xattr name */
808 return 0;
809 if (b->buf) {
Christoph Hellwig431547b2009-11-13 09:52:56 +0000810 size = handler->list(b->dentry, b->buf + b->pos,
811 b->size, name, namelen,
812 handler->flags);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400813 if (size > b->size)
814 return -ERANGE;
815 } else {
Christoph Hellwig431547b2009-11-13 09:52:56 +0000816 size = handler->list(b->dentry, NULL, 0, name,
817 namelen, handler->flags);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700818 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400820 b->pos += size;
821 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700822 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700824
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825/*
826 * Inode operation listxattr()
827 *
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400828 * We totally ignore the generic listxattr here because it would be stupid
829 * not to. Since the xattrs are organized in a directory, we can just
830 * readdir to find them.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700832ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700834 struct dentry *dir;
835 int err = 0;
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400836 loff_t pos = 0;
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400837 struct listxattr_buf buf = {
Christoph Hellwig431547b2009-11-13 09:52:56 +0000838 .dentry = dentry,
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400839 .buf = buffer,
840 .size = buffer ? size : 0,
841 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700843 if (!dentry->d_inode)
844 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845
Jeff Mahoney677c9b22009-05-05 15:30:17 -0400846 if (!dentry->d_sb->s_xattr ||
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700847 get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
848 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849
Jeff Mahoney6c176752009-03-30 14:02:34 -0400850 dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700851 if (IS_ERR(dir)) {
852 err = PTR_ERR(dir);
853 if (err == -ENODATA)
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400854 err = 0; /* Not an error if there aren't any xattrs */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700855 goto out;
856 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
Jeff Mahoney6c176752009-03-30 14:02:34 -0400858 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR);
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400859 err = reiserfs_readdir_dentry(dir, &buf, listxattr_filler, &pos);
Jeff Mahoney6c176752009-03-30 14:02:34 -0400860 mutex_unlock(&dir->d_inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400862 if (!err)
863 err = buf.pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864
Jeff Mahoney3227e142008-02-15 14:37:22 -0800865 dput(dir);
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400866out:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700867 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868}
869
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400870static int create_privroot(struct dentry *dentry)
871{
872 int err;
873 struct inode *inode = dentry->d_parent->d_inode;
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400874 WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex));
875
Jeff Mahoney6c176752009-03-30 14:02:34 -0400876 err = xattr_mkdir(inode, dentry, 0700);
Al Viroedcc37a2009-05-03 06:00:05 -0400877 if (err || !dentry->d_inode) {
878 reiserfs_warning(dentry->d_sb, "jdm-20006",
879 "xattrs/ACLs enabled and couldn't "
880 "find/create .reiserfs_priv. "
881 "Failing mount.");
882 return -EOPNOTSUPP;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700883 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884
Al Viroedcc37a2009-05-03 06:00:05 -0400885 dentry->d_inode->i_flags |= S_PRIVATE;
886 reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr "
887 "storage.\n", PRIVROOT_NAME);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888
Al Viroedcc37a2009-05-03 06:00:05 -0400889 return 0;
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400890}
891
Jeff Mahoney12abb352009-05-17 01:02:01 -0400892#else
893int __init reiserfs_xattr_register_handlers(void) { return 0; }
894void reiserfs_xattr_unregister_handlers(void) {}
895static int create_privroot(struct dentry *dentry) { return 0; }
896#endif
897
898/* Actual operations that are exported to VFS-land */
Sachin Kamatda02eb72012-08-23 17:28:57 +0200899static const struct xattr_handler *reiserfs_xattr_handlers[] = {
Jeff Mahoney12abb352009-05-17 01:02:01 -0400900#ifdef CONFIG_REISERFS_FS_XATTR
901 &reiserfs_xattr_user_handler,
902 &reiserfs_xattr_trusted_handler,
903#endif
904#ifdef CONFIG_REISERFS_FS_SECURITY
905 &reiserfs_xattr_security_handler,
906#endif
907#ifdef CONFIG_REISERFS_FS_POSIX_ACL
908 &reiserfs_posix_acl_access_handler,
909 &reiserfs_posix_acl_default_handler,
910#endif
911 NULL
912};
913
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400914static int xattr_mount_check(struct super_block *s)
915{
916 /* We need generation numbers to ensure that the oid mapping is correct
917 * v3.5 filesystems don't have them. */
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400918 if (old_format_only(s)) {
919 if (reiserfs_xattrs_optional(s)) {
920 /* Old format filesystem, but optional xattrs have
921 * been enabled. Error out. */
922 reiserfs_warning(s, "jdm-2005",
923 "xattrs/ACLs not supported "
924 "on pre-v3.6 format filesystems. "
925 "Failing mount.");
926 return -EOPNOTSUPP;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700927 }
928 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400930 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931}
932
Al Viro10556cb2011-06-20 19:28:19 -0400933int reiserfs_permission(struct inode *inode, int mask)
Jeff Mahoneyb83674c2009-05-17 01:02:03 -0400934{
935 /*
936 * We don't do permission checks on the internal objects.
937 * Permissions are determined by the "owning" object.
938 */
939 if (IS_PRIVATE(inode))
940 return 0;
941
Al Viro2830ba72011-06-20 19:16:29 -0400942 return generic_permission(inode, mask);
Jeff Mahoneyb83674c2009-05-17 01:02:03 -0400943}
944
Al Viro0b728e12012-06-10 16:03:43 -0400945static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946{
Jeff Mahoneycac36f72010-04-23 13:17:37 -0400947 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948}
949
Al Viroe16404e2009-02-20 05:55:13 +0000950static const struct dentry_operations xattr_lookup_poison_ops = {
Jeff Mahoneycac36f72010-04-23 13:17:37 -0400951 .d_revalidate = xattr_hide_revalidate,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952};
953
Al Viroedcc37a2009-05-03 06:00:05 -0400954int reiserfs_lookup_privroot(struct super_block *s)
955{
956 struct dentry *dentry;
957 int err = 0;
958
959 /* If we don't have the privroot located yet - go find it */
Frederic Weisbeckerc72e0572009-05-16 18:12:08 +0200960 reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s);
Al Viroedcc37a2009-05-03 06:00:05 -0400961 dentry = lookup_one_len(PRIVROOT_NAME, s->s_root,
962 strlen(PRIVROOT_NAME));
963 if (!IS_ERR(dentry)) {
964 REISERFS_SB(s)->priv_root = dentry;
Nick Pigginfb045ad2011-01-07 17:49:55 +1100965 d_set_d_op(dentry, &xattr_lookup_poison_ops);
Al Viroedcc37a2009-05-03 06:00:05 -0400966 if (dentry->d_inode)
967 dentry->d_inode->i_flags |= S_PRIVATE;
968 } else
969 err = PTR_ERR(dentry);
970 mutex_unlock(&s->s_root->d_inode->i_mutex);
971
972 return err;
973}
974
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975/* We need to take a copy of the mount flags since things like
976 * MS_RDONLY don't get set until *after* we're called.
977 * mount_flags != mount_options */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700978int reiserfs_xattr_init(struct super_block *s, int mount_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700980 int err = 0;
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400981 struct dentry *privroot = REISERFS_SB(s)->priv_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400983 err = xattr_mount_check(s);
984 if (err)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700985 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400987 if (!privroot->d_inode && !(mount_flags & MS_RDONLY)) {
Frederic Weisbeckerae635c02009-08-25 02:24:45 +0200988 reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s);
Al Viroedcc37a2009-05-03 06:00:05 -0400989 err = create_privroot(REISERFS_SB(s)->priv_root);
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400990 mutex_unlock(&s->s_root->d_inode->i_mutex);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700991 }
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400992
993 if (privroot->d_inode) {
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400994 s->s_xattr = reiserfs_xattr_handlers;
Frederic Weisbeckerc72e0572009-05-16 18:12:08 +0200995 reiserfs_mutex_lock_safe(&privroot->d_inode->i_mutex, s);
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400996 if (!REISERFS_SB(s)->xattr_root) {
997 struct dentry *dentry;
998 dentry = lookup_one_len(XAROOT_NAME, privroot,
999 strlen(XAROOT_NAME));
1000 if (!IS_ERR(dentry))
1001 REISERFS_SB(s)->xattr_root = dentry;
1002 else
1003 err = PTR_ERR(dentry);
1004 }
1005 mutex_unlock(&privroot->d_inode->i_mutex);
1006 }
Jeff Mahoney48b32a32009-03-30 14:02:38 -04001007
Jeff Mahoneya72bdb12009-03-30 14:02:33 -04001008error:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001009 if (err) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001010 clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt));
1011 clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt));
1012 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001014 /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001015 if (reiserfs_posixacl(s))
1016 s->s_flags |= MS_POSIXACL;
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001017 else
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001018 s->s_flags &= ~MS_POSIXACL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001020 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021}