blob: ca416d099e7d5d25dc8a2061aa30a856b26a9ef4 [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>
Christoph Hellwig47f70d02013-12-20 05:16:49 -080053#include <linux/posix_acl_xattr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#define PRIVROOT_NAME ".reiserfs_priv"
56#define XAROOT_NAME "xattrs"
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Jeff Mahoney098297b2014-04-23 10:00:36 -040059/*
60 * Helpers for inode ops. We do this so that we don't have all the VFS
Jeff Mahoney6c176752009-03-30 14:02:34 -040061 * overhead and also for proper i_mutex annotation.
Jeff Mahoney098297b2014-04-23 10:00:36 -040062 * dir->i_mutex must be held for all of them.
63 */
Jeff Mahoney3a355cc2009-03-30 16:49:58 -040064#ifdef CONFIG_REISERFS_FS_XATTR
Jeff Mahoney6c176752009-03-30 14:02:34 -040065static int xattr_create(struct inode *dir, struct dentry *dentry, int mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -070066{
Jeff Mahoney6c176752009-03-30 14:02:34 -040067 BUG_ON(!mutex_is_locked(&dir->i_mutex));
Al Viroebfc3b42012-06-10 18:05:36 -040068 return dir->i_op->create(dir, dentry, mode, true);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069}
Jeff Mahoney3a355cc2009-03-30 16:49:58 -040070#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
Al Viro18bb1db2011-07-26 01:41:39 -040072static int xattr_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
Jeff Mahoney6c176752009-03-30 14:02:34 -040073{
74 BUG_ON(!mutex_is_locked(&dir->i_mutex));
Jeff Mahoney6c176752009-03-30 14:02:34 -040075 return dir->i_op->mkdir(dir, dentry, mode);
76}
77
Jeff Mahoney098297b2014-04-23 10:00:36 -040078/*
79 * We use I_MUTEX_CHILD here to silence lockdep. It's safe because xattr
Jeff Mahoney6c176752009-03-30 14:02:34 -040080 * mutation ops aren't called during rename or splace, which are the
81 * only other users of I_MUTEX_CHILD. It violates the ordering, but that's
Jeff Mahoney098297b2014-04-23 10:00:36 -040082 * better than allocating another subclass just for this code.
83 */
Jeff Mahoney6c176752009-03-30 14:02:34 -040084static int xattr_unlink(struct inode *dir, struct dentry *dentry)
85{
86 int error;
87 BUG_ON(!mutex_is_locked(&dir->i_mutex));
Jeff Mahoney6c176752009-03-30 14:02:34 -040088
Jeff Mahoney4c051412013-08-08 17:27:19 -040089 mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD);
Jeff Mahoney6c176752009-03-30 14:02:34 -040090 error = dir->i_op->unlink(dir, dentry);
91 mutex_unlock(&dentry->d_inode->i_mutex);
92
93 if (!error)
94 d_delete(dentry);
95 return error;
96}
97
98static int xattr_rmdir(struct inode *dir, struct dentry *dentry)
99{
100 int error;
101 BUG_ON(!mutex_is_locked(&dir->i_mutex));
Jeff Mahoney6c176752009-03-30 14:02:34 -0400102
Jeff Mahoney4c051412013-08-08 17:27:19 -0400103 mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD);
Jeff Mahoney6c176752009-03-30 14:02:34 -0400104 error = dir->i_op->rmdir(dir, dentry);
105 if (!error)
106 dentry->d_inode->i_flags |= S_DEAD;
107 mutex_unlock(&dentry->d_inode->i_mutex);
108 if (!error)
109 d_delete(dentry);
Jeff Mahoney6c176752009-03-30 14:02:34 -0400110
111 return error;
112}
113
Jeff Mahoney6c176752009-03-30 14:02:34 -0400114#define xattr_may_create(flags) (!flags || flags & XATTR_CREATE)
115
Jeff Mahoney6c176752009-03-30 14:02:34 -0400116static struct dentry *open_xa_root(struct super_block *sb, int flags)
117{
118 struct dentry *privroot = REISERFS_SB(sb)->priv_root;
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400119 struct dentry *xaroot;
120 if (!privroot->d_inode)
Jeff Mahoney6c176752009-03-30 14:02:34 -0400121 return ERR_PTR(-ENODATA);
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400122
123 mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR);
124
125 xaroot = dget(REISERFS_SB(sb)->xattr_root);
Jeff Mahoneyceb5edc2009-05-17 01:02:02 -0400126 if (!xaroot)
127 xaroot = ERR_PTR(-ENODATA);
128 else if (!xaroot->d_inode) {
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400129 int err = -ENODATA;
130 if (xattr_may_create(flags))
131 err = xattr_mkdir(privroot->d_inode, xaroot, 0700);
132 if (err) {
133 dput(xaroot);
134 xaroot = ERR_PTR(err);
135 }
136 }
137
138 mutex_unlock(&privroot->d_inode->i_mutex);
139 return xaroot;
Jeff Mahoney6c176752009-03-30 14:02:34 -0400140}
141
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700142static struct dentry *open_xa_dir(const struct inode *inode, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700144 struct dentry *xaroot, *xadir;
145 char namebuf[17];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
Jeff Mahoney6c176752009-03-30 14:02:34 -0400147 xaroot = open_xa_root(inode->i_sb, flags);
Jeff Mahoney9b7f3752007-04-23 14:41:17 -0700148 if (IS_ERR(xaroot))
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700149 return xaroot;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700151 snprintf(namebuf, sizeof(namebuf), "%X.%X",
152 le32_to_cpu(INODE_PKEY(inode)->k_objectid),
153 inode->i_generation);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400155 mutex_lock_nested(&xaroot->d_inode->i_mutex, I_MUTEX_XATTR);
156
157 xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf));
158 if (!IS_ERR(xadir) && !xadir->d_inode) {
159 int err = -ENODATA;
160 if (xattr_may_create(flags))
161 err = xattr_mkdir(xaroot->d_inode, xadir, 0700);
162 if (err) {
163 dput(xadir);
164 xadir = ERR_PTR(err);
165 }
166 }
167
168 mutex_unlock(&xaroot->d_inode->i_mutex);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700169 dput(xaroot);
170 return xadir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171}
172
Jeff Mahoney098297b2014-04-23 10:00:36 -0400173/*
174 * The following are side effects of other operations that aren't explicitly
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400175 * modifying extended attributes. This includes operations such as permissions
Jeff Mahoney098297b2014-04-23 10:00:36 -0400176 * or ownership changes, object deletions, etc.
177 */
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400178struct reiserfs_dentry_buf {
Al Viro4acf3812013-05-17 22:42:17 -0400179 struct dir_context ctx;
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400180 struct dentry *xadir;
181 int count;
182 struct dentry *dentries[8];
183};
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400184
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400185static int
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400186fill_with_dentries(void *buf, const char *name, int namelen, loff_t offset,
187 u64 ino, unsigned int d_type)
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400188{
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400189 struct reiserfs_dentry_buf *dbuf = buf;
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400190 struct dentry *dentry;
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400191 WARN_ON_ONCE(!mutex_is_locked(&dbuf->xadir->d_inode->i_mutex));
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400192
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400193 if (dbuf->count == ARRAY_SIZE(dbuf->dentries))
194 return -ENOSPC;
195
Jan Kara35e5cbc2013-03-29 15:39:16 +0100196 if (name[0] == '.' && (namelen < 2 ||
197 (namelen == 2 && name[1] == '.')))
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400198 return 0;
199
200 dentry = lookup_one_len(name, dbuf->xadir, namelen);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400201 if (IS_ERR(dentry)) {
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400202 return PTR_ERR(dentry);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400203 } else if (!dentry->d_inode) {
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400204 /* A directory entry exists, but no file? */
205 reiserfs_error(dentry->d_sb, "xattr-20003",
206 "Corrupted directory: xattr %s listed but "
207 "not found for file %s.\n",
208 dentry->d_name.name, dbuf->xadir->d_name.name);
209 dput(dentry);
210 return -EIO;
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400211 }
212
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400213 dbuf->dentries[dbuf->count++] = dentry;
214 return 0;
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400215}
216
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400217static void
218cleanup_dentry_buf(struct reiserfs_dentry_buf *buf)
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400219{
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400220 int i;
221 for (i = 0; i < buf->count; i++)
222 if (buf->dentries[i])
223 dput(buf->dentries[i]);
224}
225
226static int reiserfs_for_each_xattr(struct inode *inode,
227 int (*action)(struct dentry *, void *),
228 void *data)
229{
230 struct dentry *dir;
231 int i, err = 0;
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400232 struct reiserfs_dentry_buf buf = {
Al Viro4acf3812013-05-17 22:42:17 -0400233 .ctx.actor = fill_with_dentries,
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400234 };
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400235
236 /* Skip out, an xattr has no xattrs associated with it */
237 if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1)
238 return 0;
239
Jeff Mahoney6c176752009-03-30 14:02:34 -0400240 dir = open_xa_dir(inode, XATTR_REPLACE);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400241 if (IS_ERR(dir)) {
242 err = PTR_ERR(dir);
243 goto out;
244 } else if (!dir->d_inode) {
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400245 err = 0;
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
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400251 buf.xadir = dir;
Al Virocd62cda2013-05-17 22:58:58 -0400252 while (1) {
253 err = reiserfs_readdir_inode(dir->d_inode, &buf.ctx);
254 if (err)
255 break;
256 if (!buf.count)
257 break;
258 for (i = 0; !err && i < buf.count && buf.dentries[i]; i++) {
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400259 struct dentry *dentry = buf.dentries[i];
260
Al Virocd62cda2013-05-17 22:58:58 -0400261 if (!S_ISDIR(dentry->d_inode->i_mode))
262 err = action(dentry, data);
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400263
264 dput(dentry);
265 buf.dentries[i] = NULL;
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400266 }
Al Virocd62cda2013-05-17 22:58:58 -0400267 if (err)
268 break;
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400269 buf.count = 0;
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400270 }
Jeff Mahoney6c176752009-03-30 14:02:34 -0400271 mutex_unlock(&dir->d_inode->i_mutex);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400272
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400273 cleanup_dentry_buf(&buf);
274
275 if (!err) {
Jeff Mahoney098297b2014-04-23 10:00:36 -0400276 /*
277 * We start a transaction here to avoid a ABBA situation
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400278 * between the xattr root's i_mutex and the journal lock.
279 * This doesn't incur much additional overhead since the
280 * new transaction will just nest inside the
Jeff Mahoney098297b2014-04-23 10:00:36 -0400281 * outer transaction.
282 */
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400283 int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 +
284 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb);
285 struct reiserfs_transaction_handle th;
Jeff Mahoney4c051412013-08-08 17:27:19 -0400286 reiserfs_write_lock(inode->i_sb);
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400287 err = journal_begin(&th, inode->i_sb, blocks);
Jeff Mahoney4c051412013-08-08 17:27:19 -0400288 reiserfs_write_unlock(inode->i_sb);
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400289 if (!err) {
290 int jerror;
Jeff Mahoney4c051412013-08-08 17:27:19 -0400291 mutex_lock_nested(&dir->d_parent->d_inode->i_mutex,
292 I_MUTEX_XATTR);
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400293 err = action(dir, data);
Jeff Mahoney4c051412013-08-08 17:27:19 -0400294 reiserfs_write_lock(inode->i_sb);
Jeff Mahoney58d85422014-04-23 10:00:38 -0400295 jerror = journal_end(&th);
Jeff Mahoney4c051412013-08-08 17:27:19 -0400296 reiserfs_write_unlock(inode->i_sb);
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400297 mutex_unlock(&dir->d_parent->d_inode->i_mutex);
298 err = jerror ?: err;
299 }
300 }
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400301out_dir:
302 dput(dir);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400303out:
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400304 /* -ENODATA isn't an error */
305 if (err == -ENODATA)
306 err = 0;
307 return err;
308}
309
310static int delete_one_xattr(struct dentry *dentry, void *data)
311{
312 struct inode *dir = dentry->d_parent->d_inode;
313
314 /* This is the xattr dir, handle specially. */
315 if (S_ISDIR(dentry->d_inode->i_mode))
316 return xattr_rmdir(dir, dentry);
317
318 return xattr_unlink(dir, dentry);
319}
320
321static int chown_one_xattr(struct dentry *dentry, void *data)
322{
323 struct iattr *attrs = data;
Jeff Mahoney4a857012013-05-31 15:54:17 -0400324 int ia_valid = attrs->ia_valid;
325 int err;
326
327 /*
328 * We only want the ownership bits. Otherwise, we'll do
329 * things like change a directory to a regular file if
330 * ATTR_MODE is set.
331 */
332 attrs->ia_valid &= (ATTR_UID|ATTR_GID);
333 err = reiserfs_setattr(dentry, attrs);
334 attrs->ia_valid = ia_valid;
335
336 return err;
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400337}
338
339/* No i_mutex, but the inode is unconnected. */
340int reiserfs_delete_xattrs(struct inode *inode)
341{
342 int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL);
343 if (err)
344 reiserfs_warning(inode->i_sb, "jdm-20004",
345 "Couldn't delete all xattrs (%d)\n", err);
346 return err;
347}
348
349/* inode->i_mutex: down */
350int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs)
351{
352 int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs);
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400353 if (err)
354 reiserfs_warning(inode->i_sb, "jdm-20007",
355 "Couldn't chown all xattrs (%d)\n", err);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400356 return err;
357}
358
359#ifdef CONFIG_REISERFS_FS_XATTR
Jeff Mahoney098297b2014-04-23 10:00:36 -0400360/*
361 * Returns a dentry corresponding to a specific extended attribute file
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 * for the inode. If flags allow, the file is created. Otherwise, a
Jeff Mahoney098297b2014-04-23 10:00:36 -0400363 * valid or negative dentry, or an error is returned.
364 */
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400365static struct dentry *xattr_lookup(struct inode *inode, const char *name,
366 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700368 struct dentry *xadir, *xafile;
369 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700371 xadir = open_xa_dir(inode, flags);
Jeff Mahoney6c176752009-03-30 14:02:34 -0400372 if (IS_ERR(xadir))
David Howellse231c2e2008-02-07 00:15:26 -0800373 return ERR_CAST(xadir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400375 mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700376 xafile = lookup_one_len(name, xadir, strlen(name));
377 if (IS_ERR(xafile)) {
Jeff Mahoney6c176752009-03-30 14:02:34 -0400378 err = PTR_ERR(xafile);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700379 goto out;
Jeff Mahoney6c176752009-03-30 14:02:34 -0400380 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
Jeff Mahoney6c176752009-03-30 14:02:34 -0400382 if (xafile->d_inode && (flags & XATTR_CREATE))
383 err = -EEXIST;
384
385 if (!xafile->d_inode) {
386 err = -ENODATA;
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400387 if (xattr_may_create(flags))
Jeff Mahoney6c176752009-03-30 14:02:34 -0400388 err = xattr_create(xadir->d_inode, xafile,
389 0700|S_IFREG);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700390 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
Jeff Mahoney6c176752009-03-30 14:02:34 -0400392 if (err)
393 dput(xafile);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400394out:
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400395 mutex_unlock(&xadir->d_inode->i_mutex);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700396 dput(xadir);
397 if (err)
Jeff Mahoney6c176752009-03-30 14:02:34 -0400398 return ERR_PTR(err);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800399 return xafile;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400}
401
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402/* Internal operations on file data */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700403static inline void reiserfs_put_page(struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700405 kunmap(page);
406 page_cache_release(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407}
408
Jeff Mahoneyec6ea562009-03-30 14:02:30 -0400409static struct page *reiserfs_get_page(struct inode *dir, size_t n)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700411 struct address_space *mapping = dir->i_mapping;
412 struct page *page;
Jeff Mahoney098297b2014-04-23 10:00:36 -0400413 /*
414 * We can deadlock if we try to free dentries,
415 * and an unlink/rmdir has just occurred - GFP_NOFS avoids this
416 */
Al Viroc4cdd032005-10-21 03:22:39 -0400417 mapping_set_gfp_mask(mapping, GFP_NOFS);
Jeff Mahoneyec6ea562009-03-30 14:02:30 -0400418 page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700419 if (!IS_ERR(page)) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700420 kmap(page);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700421 if (PageError(page))
422 goto fail;
423 }
424 return page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
Jeff Mahoneycf776a72014-04-23 10:00:41 -0400426fail:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700427 reiserfs_put_page(page);
428 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429}
430
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700431static inline __u32 xattr_hash(const char *msg, int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700433 return csum_partial(msg, len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434}
435
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -0700436int reiserfs_commit_write(struct file *f, struct page *page,
437 unsigned from, unsigned to);
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -0700438
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400439static void update_ctime(struct inode *inode)
440{
441 struct timespec now = current_fs_time(inode->i_sb);
Al Viro1d3382cb2010-10-23 15:19:20 -0400442 if (inode_unhashed(inode) || !inode->i_nlink ||
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400443 timespec_equal(&inode->i_ctime, &now))
444 return;
445
446 inode->i_ctime = CURRENT_TIME_SEC;
447 mark_inode_dirty(inode);
448}
449
450static int lookup_and_delete_xattr(struct inode *inode, const char *name)
451{
452 int err = 0;
453 struct dentry *dentry, *xadir;
454
455 xadir = open_xa_dir(inode, XATTR_REPLACE);
456 if (IS_ERR(xadir))
457 return PTR_ERR(xadir);
458
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400459 mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400460 dentry = lookup_one_len(name, xadir, strlen(name));
461 if (IS_ERR(dentry)) {
462 err = PTR_ERR(dentry);
463 goto out_dput;
464 }
465
466 if (dentry->d_inode) {
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400467 err = xattr_unlink(xadir->d_inode, dentry);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400468 update_ctime(inode);
469 }
470
471 dput(dentry);
472out_dput:
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400473 mutex_unlock(&xadir->d_inode->i_mutex);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400474 dput(xadir);
475 return err;
476}
477
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -0700478
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479/* Generic extended attribute operations that can be used by xa plugins */
480
481/*
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800482 * inode->i_mutex: down
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 */
484int
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400485reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th,
486 struct inode *inode, const char *name,
487 const void *buffer, size_t buffer_size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700489 int err = 0;
Jeff Mahoney3227e142008-02-15 14:37:22 -0800490 struct dentry *dentry;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700491 struct page *page;
492 char *data;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700493 size_t file_pos = 0;
494 size_t buffer_pos = 0;
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400495 size_t new_size;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700496 __u32 xahash = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700498 if (get_inode_sd_version(inode) == STAT_DATA_V1)
499 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500
Frederic Weisbecker4f3be1b2010-01-05 02:14:30 +0100501 if (!buffer) {
502 err = lookup_and_delete_xattr(inode, name);
Frederic Weisbecker4f3be1b2010-01-05 02:14:30 +0100503 return err;
504 }
505
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400506 dentry = xattr_lookup(inode, name, flags);
Jeff Mahoney4c051412013-08-08 17:27:19 -0400507 if (IS_ERR(dentry))
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400508 return PTR_ERR(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509
Frederic Weisbeckerf3e22f42010-01-03 03:44:53 +0100510 down_write(&REISERFS_I(inode)->i_xattr_sem);
Frederic Weisbecker3f14fea2009-12-30 07:03:53 +0100511
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400512 xahash = xattr_hash(buffer, buffer_size);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700513 while (buffer_pos < buffer_size || buffer_pos == 0) {
514 size_t chunk;
515 size_t skip = 0;
516 size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1));
517 if (buffer_size - buffer_pos > PAGE_CACHE_SIZE)
518 chunk = PAGE_CACHE_SIZE;
519 else
520 chunk = buffer_size - buffer_pos;
521
Jeff Mahoneyec6ea562009-03-30 14:02:30 -0400522 page = reiserfs_get_page(dentry->d_inode, file_pos);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700523 if (IS_ERR(page)) {
524 err = PTR_ERR(page);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400525 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700526 }
527
528 lock_page(page);
529 data = page_address(page);
530
531 if (file_pos == 0) {
532 struct reiserfs_xattr_header *rxh;
533 skip = file_pos = sizeof(struct reiserfs_xattr_header);
534 if (chunk + skip > PAGE_CACHE_SIZE)
535 chunk = PAGE_CACHE_SIZE - skip;
536 rxh = (struct reiserfs_xattr_header *)data;
537 rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC);
538 rxh->h_hash = cpu_to_le32(xahash);
539 }
540
Jeff Mahoney4c051412013-08-08 17:27:19 -0400541 reiserfs_write_lock(inode->i_sb);
Christoph Hellwigebdec242010-10-06 10:47:23 +0200542 err = __reiserfs_write_begin(page, page_offset, chunk + skip);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700543 if (!err) {
544 if (buffer)
545 memcpy(data + skip, buffer + buffer_pos, chunk);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800546 err = reiserfs_commit_write(NULL, page, page_offset,
547 page_offset + chunk +
548 skip);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700549 }
Jeff Mahoney4c051412013-08-08 17:27:19 -0400550 reiserfs_write_unlock(inode->i_sb);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700551 unlock_page(page);
552 reiserfs_put_page(page);
553 buffer_pos += chunk;
554 file_pos += chunk;
555 skip = 0;
556 if (err || buffer_size == 0 || !buffer)
557 break;
558 }
559
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400560 new_size = buffer_size + sizeof(struct reiserfs_xattr_header);
561 if (!err && new_size < i_size_read(dentry->d_inode)) {
562 struct iattr newattrs = {
563 .ia_ctime = current_fs_time(inode->i_sb),
Jeff Mahoneyfb2162d2010-04-23 13:17:41 -0400564 .ia_size = new_size,
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400565 .ia_valid = ATTR_SIZE | ATTR_CTIME,
566 };
Frederic Weisbecker31370f62010-01-07 15:55:31 +0100567
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400568 mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR);
Christoph Hellwigbd5fe6c2011-06-24 14:29:43 -0400569 inode_dio_wait(dentry->d_inode);
Frederic Weisbecker31370f62010-01-07 15:55:31 +0100570
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400571 err = reiserfs_setattr(dentry, &newattrs);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400572 mutex_unlock(&dentry->d_inode->i_mutex);
573 } else
574 update_ctime(inode);
575out_unlock:
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400576 up_write(&REISERFS_I(inode)->i_xattr_sem);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800577 dput(dentry);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400578 return err;
579}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700580
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400581/* We need to start a transaction to maintain lock ordering */
582int reiserfs_xattr_set(struct inode *inode, const char *name,
583 const void *buffer, size_t buffer_size, int flags)
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400584{
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400585
586 struct reiserfs_transaction_handle th;
587 int error, error2;
588 size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size);
589
590 if (!(flags & XATTR_REPLACE))
591 jbegin_count += reiserfs_xattr_jcreate_nblocks(inode);
592
593 reiserfs_write_lock(inode->i_sb);
594 error = journal_begin(&th, inode->i_sb, jbegin_count);
Jeff Mahoney4c051412013-08-08 17:27:19 -0400595 reiserfs_write_unlock(inode->i_sb);
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400596 if (error) {
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400597 return error;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700598 }
599
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400600 error = reiserfs_xattr_set_handle(&th, inode, name,
601 buffer, buffer_size, flags);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700602
Jeff Mahoney4c051412013-08-08 17:27:19 -0400603 reiserfs_write_lock(inode->i_sb);
Jeff Mahoney58d85422014-04-23 10:00:38 -0400604 error2 = journal_end(&th);
Jeff Mahoney4c051412013-08-08 17:27:19 -0400605 reiserfs_write_unlock(inode->i_sb);
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400606 if (error == 0)
607 error = error2;
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400608
609 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610}
611
612/*
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800613 * inode->i_mutex: down
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 */
615int
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400616reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700617 size_t buffer_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700619 ssize_t err = 0;
Jeff Mahoney3227e142008-02-15 14:37:22 -0800620 struct dentry *dentry;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700621 size_t isize;
622 size_t file_pos = 0;
623 size_t buffer_pos = 0;
624 struct page *page;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700625 __u32 hash = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700627 if (name == NULL)
628 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629
Jeff Mahoney098297b2014-04-23 10:00:36 -0400630 /*
631 * We can't have xattrs attached to v1 items since they don't have
632 * generation numbers
633 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700634 if (get_inode_sd_version(inode) == STAT_DATA_V1)
635 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400637 dentry = xattr_lookup(inode, name, XATTR_REPLACE);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800638 if (IS_ERR(dentry)) {
639 err = PTR_ERR(dentry);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700640 goto out;
641 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400643 down_read(&REISERFS_I(inode)->i_xattr_sem);
Jeff Mahoneyd9845612009-03-30 14:02:35 -0400644
Jeff Mahoneyf437c522009-03-30 14:02:29 -0400645 isize = i_size_read(dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700647 /* Just return the size needed */
648 if (buffer == NULL) {
649 err = isize - sizeof(struct reiserfs_xattr_header);
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400650 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700651 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700653 if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) {
654 err = -ERANGE;
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400655 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700656 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700658 while (file_pos < isize) {
659 size_t chunk;
660 char *data;
661 size_t skip = 0;
662 if (isize - file_pos > PAGE_CACHE_SIZE)
663 chunk = PAGE_CACHE_SIZE;
664 else
665 chunk = isize - file_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666
Jeff Mahoneyec6ea562009-03-30 14:02:30 -0400667 page = reiserfs_get_page(dentry->d_inode, file_pos);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700668 if (IS_ERR(page)) {
669 err = PTR_ERR(page);
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400670 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700671 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700673 lock_page(page);
674 data = page_address(page);
675 if (file_pos == 0) {
676 struct reiserfs_xattr_header *rxh =
677 (struct reiserfs_xattr_header *)data;
678 skip = file_pos = sizeof(struct reiserfs_xattr_header);
679 chunk -= skip;
680 /* Magic doesn't match up.. */
681 if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) {
682 unlock_page(page);
683 reiserfs_put_page(page);
Jeff Mahoney45b03d52009-03-30 14:02:21 -0400684 reiserfs_warning(inode->i_sb, "jdm-20001",
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700685 "Invalid magic for xattr (%s) "
686 "associated with %k", name,
687 INODE_PKEY(inode));
688 err = -EIO;
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400689 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700690 }
691 hash = le32_to_cpu(rxh->h_hash);
692 }
693 memcpy(buffer + buffer_pos, data + skip, chunk);
694 unlock_page(page);
695 reiserfs_put_page(page);
696 file_pos += chunk;
697 buffer_pos += chunk;
698 skip = 0;
699 }
700 err = isize - sizeof(struct reiserfs_xattr_header);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700702 if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) !=
703 hash) {
Jeff Mahoney45b03d52009-03-30 14:02:21 -0400704 reiserfs_warning(inode->i_sb, "jdm-20002",
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700705 "Invalid hash for xattr (%s) associated "
706 "with %k", name, INODE_PKEY(inode));
707 err = -EIO;
708 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400710out_unlock:
711 up_read(&REISERFS_I(inode)->i_xattr_sem);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800712 dput(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400714out:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700715 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716}
717
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400718/*
719 * In order to implement different sets of xattr operations for each xattr
720 * prefix with the generic xattr API, a filesystem should create a
721 * null-terminated array of struct xattr_handler (one for each prefix) and
722 * hang a pointer to it off of the s_xattr field of the superblock.
723 *
724 * The generic_fooxattr() functions will use this list to dispatch xattr
725 * operations to the correct xattr_handler.
726 */
727#define for_each_xattr_handler(handlers, handler) \
728 for ((handler) = *(handlers)++; \
729 (handler) != NULL; \
730 (handler) = *(handlers)++)
731
732/* This is the implementation for the xattr plugin infrastructure */
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700733static inline const struct xattr_handler *
734find_xattr_handler_prefix(const struct xattr_handler **handlers,
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400735 const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736{
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700737 const struct xattr_handler *xah;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400739 if (!handlers)
740 return NULL;
741
742 for_each_xattr_handler(handlers, xah) {
743 if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0)
744 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 }
746
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400747 return xah;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748}
749
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750
751/*
752 * Inode operation getxattr()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 */
754ssize_t
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700755reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer,
756 size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757{
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700758 const struct xattr_handler *handler;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759
Christoph Hellwig431547b2009-11-13 09:52:56 +0000760 handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400761
Christoph Hellwig431547b2009-11-13 09:52:56 +0000762 if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700763 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764
Christoph Hellwig431547b2009-11-13 09:52:56 +0000765 return handler->get(dentry, name, buffer, size, handler->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766}
767
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768/*
769 * Inode operation setxattr()
770 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800771 * dentry->d_inode->i_mutex down
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 */
773int
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700774reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value,
775 size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776{
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700777 const struct xattr_handler *handler;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778
Christoph Hellwig431547b2009-11-13 09:52:56 +0000779 handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400780
Christoph Hellwig431547b2009-11-13 09:52:56 +0000781 if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700782 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783
Christoph Hellwig431547b2009-11-13 09:52:56 +0000784 return handler->set(dentry, name, value, size, flags, handler->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785}
786
787/*
788 * Inode operation removexattr()
789 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800790 * dentry->d_inode->i_mutex down
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700792int reiserfs_removexattr(struct dentry *dentry, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793{
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700794 const struct xattr_handler *handler;
Christoph Hellwig431547b2009-11-13 09:52:56 +0000795 handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796
Christoph Hellwig431547b2009-11-13 09:52:56 +0000797 if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700798 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799
Christoph Hellwig431547b2009-11-13 09:52:56 +0000800 return handler->set(dentry, name, NULL, 0, XATTR_REPLACE, handler->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801}
802
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400803struct listxattr_buf {
Al Viro4acf3812013-05-17 22:42:17 -0400804 struct dir_context ctx;
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400805 size_t size;
806 size_t pos;
807 char *buf;
Christoph Hellwig431547b2009-11-13 09:52:56 +0000808 struct dentry *dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809};
810
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400811static int listxattr_filler(void *buf, const char *name, int namelen,
812 loff_t offset, u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813{
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400814 struct listxattr_buf *b = (struct listxattr_buf *)buf;
815 size_t size;
816 if (name[0] != '.' ||
817 (namelen != 1 && (name[1] != '.' || namelen != 2))) {
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700818 const struct xattr_handler *handler;
Christoph Hellwig431547b2009-11-13 09:52:56 +0000819 handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr,
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400820 name);
821 if (!handler) /* Unsupported xattr name */
822 return 0;
823 if (b->buf) {
Christoph Hellwig431547b2009-11-13 09:52:56 +0000824 size = handler->list(b->dentry, b->buf + b->pos,
825 b->size, name, namelen,
826 handler->flags);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400827 if (size > b->size)
828 return -ERANGE;
829 } else {
Christoph Hellwig431547b2009-11-13 09:52:56 +0000830 size = handler->list(b->dentry, NULL, 0, name,
831 namelen, handler->flags);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700832 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400834 b->pos += size;
835 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700836 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700838
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839/*
840 * Inode operation listxattr()
841 *
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400842 * We totally ignore the generic listxattr here because it would be stupid
843 * not to. Since the xattrs are organized in a directory, we can just
844 * readdir to find them.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700846ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700848 struct dentry *dir;
849 int err = 0;
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400850 struct listxattr_buf buf = {
Al Viro4acf3812013-05-17 22:42:17 -0400851 .ctx.actor = listxattr_filler,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000852 .dentry = dentry,
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400853 .buf = buffer,
854 .size = buffer ? size : 0,
855 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700857 if (!dentry->d_inode)
858 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859
Jeff Mahoney677c9b22009-05-05 15:30:17 -0400860 if (!dentry->d_sb->s_xattr ||
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700861 get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
862 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863
Jeff Mahoney6c176752009-03-30 14:02:34 -0400864 dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700865 if (IS_ERR(dir)) {
866 err = PTR_ERR(dir);
867 if (err == -ENODATA)
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400868 err = 0; /* Not an error if there aren't any xattrs */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700869 goto out;
870 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
Jeff Mahoney6c176752009-03-30 14:02:34 -0400872 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR);
Al Virocd62cda2013-05-17 22:58:58 -0400873 err = reiserfs_readdir_inode(dir->d_inode, &buf.ctx);
Jeff Mahoney6c176752009-03-30 14:02:34 -0400874 mutex_unlock(&dir->d_inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400876 if (!err)
877 err = buf.pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878
Jeff Mahoney3227e142008-02-15 14:37:22 -0800879 dput(dir);
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400880out:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700881 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882}
883
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400884static int create_privroot(struct dentry *dentry)
885{
886 int err;
887 struct inode *inode = dentry->d_parent->d_inode;
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400888 WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex));
889
Jeff Mahoney6c176752009-03-30 14:02:34 -0400890 err = xattr_mkdir(inode, dentry, 0700);
Al Viroedcc37a2009-05-03 06:00:05 -0400891 if (err || !dentry->d_inode) {
892 reiserfs_warning(dentry->d_sb, "jdm-20006",
893 "xattrs/ACLs enabled and couldn't "
894 "find/create .reiserfs_priv. "
895 "Failing mount.");
896 return -EOPNOTSUPP;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700897 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
Al Viroedcc37a2009-05-03 06:00:05 -0400899 dentry->d_inode->i_flags |= S_PRIVATE;
900 reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr "
901 "storage.\n", PRIVROOT_NAME);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902
Al Viroedcc37a2009-05-03 06:00:05 -0400903 return 0;
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400904}
905
Jeff Mahoney12abb352009-05-17 01:02:01 -0400906#else
907int __init reiserfs_xattr_register_handlers(void) { return 0; }
908void reiserfs_xattr_unregister_handlers(void) {}
909static int create_privroot(struct dentry *dentry) { return 0; }
910#endif
911
912/* Actual operations that are exported to VFS-land */
Sachin Kamatda02eb72012-08-23 17:28:57 +0200913static const struct xattr_handler *reiserfs_xattr_handlers[] = {
Jeff Mahoney12abb352009-05-17 01:02:01 -0400914#ifdef CONFIG_REISERFS_FS_XATTR
915 &reiserfs_xattr_user_handler,
916 &reiserfs_xattr_trusted_handler,
917#endif
918#ifdef CONFIG_REISERFS_FS_SECURITY
919 &reiserfs_xattr_security_handler,
920#endif
921#ifdef CONFIG_REISERFS_FS_POSIX_ACL
Christoph Hellwig47f70d02013-12-20 05:16:49 -0800922 &posix_acl_access_xattr_handler,
923 &posix_acl_default_xattr_handler,
Jeff Mahoney12abb352009-05-17 01:02:01 -0400924#endif
925 NULL
926};
927
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400928static int xattr_mount_check(struct super_block *s)
929{
Jeff Mahoney098297b2014-04-23 10:00:36 -0400930 /*
931 * We need generation numbers to ensure that the oid mapping is correct
932 * v3.5 filesystems don't have them.
933 */
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400934 if (old_format_only(s)) {
935 if (reiserfs_xattrs_optional(s)) {
Jeff Mahoney098297b2014-04-23 10:00:36 -0400936 /*
937 * Old format filesystem, but optional xattrs have
938 * been enabled. Error out.
939 */
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400940 reiserfs_warning(s, "jdm-2005",
941 "xattrs/ACLs not supported "
942 "on pre-v3.6 format filesystems. "
943 "Failing mount.");
944 return -EOPNOTSUPP;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700945 }
946 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400948 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949}
950
Al Viro10556cb2011-06-20 19:28:19 -0400951int reiserfs_permission(struct inode *inode, int mask)
Jeff Mahoneyb83674c2009-05-17 01:02:03 -0400952{
953 /*
954 * We don't do permission checks on the internal objects.
955 * Permissions are determined by the "owning" object.
956 */
957 if (IS_PRIVATE(inode))
958 return 0;
959
Al Viro2830ba72011-06-20 19:16:29 -0400960 return generic_permission(inode, mask);
Jeff Mahoneyb83674c2009-05-17 01:02:03 -0400961}
962
Al Viro0b728e12012-06-10 16:03:43 -0400963static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964{
Jeff Mahoneycac36f72010-04-23 13:17:37 -0400965 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966}
967
Al Viroe16404e2009-02-20 05:55:13 +0000968static const struct dentry_operations xattr_lookup_poison_ops = {
Jeff Mahoneycac36f72010-04-23 13:17:37 -0400969 .d_revalidate = xattr_hide_revalidate,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970};
971
Al Viroedcc37a2009-05-03 06:00:05 -0400972int reiserfs_lookup_privroot(struct super_block *s)
973{
974 struct dentry *dentry;
975 int err = 0;
976
977 /* If we don't have the privroot located yet - go find it */
Jeff Mahoney4c051412013-08-08 17:27:19 -0400978 mutex_lock(&s->s_root->d_inode->i_mutex);
Al Viroedcc37a2009-05-03 06:00:05 -0400979 dentry = lookup_one_len(PRIVROOT_NAME, s->s_root,
980 strlen(PRIVROOT_NAME));
981 if (!IS_ERR(dentry)) {
982 REISERFS_SB(s)->priv_root = dentry;
Nick Pigginfb045ad2011-01-07 17:49:55 +1100983 d_set_d_op(dentry, &xattr_lookup_poison_ops);
Al Viroedcc37a2009-05-03 06:00:05 -0400984 if (dentry->d_inode)
985 dentry->d_inode->i_flags |= S_PRIVATE;
986 } else
987 err = PTR_ERR(dentry);
988 mutex_unlock(&s->s_root->d_inode->i_mutex);
989
990 return err;
991}
992
Jeff Mahoney098297b2014-04-23 10:00:36 -0400993/*
994 * We need to take a copy of the mount flags since things like
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 * MS_RDONLY don't get set until *after* we're called.
Jeff Mahoney098297b2014-04-23 10:00:36 -0400996 * mount_flags != mount_options
997 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700998int reiserfs_xattr_init(struct super_block *s, int mount_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001000 int err = 0;
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001001 struct dentry *privroot = REISERFS_SB(s)->priv_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002
Jeff Mahoneya72bdb12009-03-30 14:02:33 -04001003 err = xattr_mount_check(s);
1004 if (err)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001005 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001007 if (!privroot->d_inode && !(mount_flags & MS_RDONLY)) {
Jeff Mahoney4c051412013-08-08 17:27:19 -04001008 mutex_lock(&s->s_root->d_inode->i_mutex);
Al Viroedcc37a2009-05-03 06:00:05 -04001009 err = create_privroot(REISERFS_SB(s)->priv_root);
Jeff Mahoney5a6059c2009-05-01 12:11:12 -04001010 mutex_unlock(&s->s_root->d_inode->i_mutex);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001011 }
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001012
1013 if (privroot->d_inode) {
Jeff Mahoney48b32a32009-03-30 14:02:38 -04001014 s->s_xattr = reiserfs_xattr_handlers;
Jeff Mahoney4c051412013-08-08 17:27:19 -04001015 mutex_lock(&privroot->d_inode->i_mutex);
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001016 if (!REISERFS_SB(s)->xattr_root) {
1017 struct dentry *dentry;
1018 dentry = lookup_one_len(XAROOT_NAME, privroot,
1019 strlen(XAROOT_NAME));
1020 if (!IS_ERR(dentry))
1021 REISERFS_SB(s)->xattr_root = dentry;
1022 else
1023 err = PTR_ERR(dentry);
1024 }
1025 mutex_unlock(&privroot->d_inode->i_mutex);
1026 }
Jeff Mahoney48b32a32009-03-30 14:02:38 -04001027
Jeff Mahoneya72bdb12009-03-30 14:02:33 -04001028error:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001029 if (err) {
Jeff Mahoneya228bf82014-04-23 10:00:42 -04001030 clear_bit(REISERFS_XATTRS_USER, &REISERFS_SB(s)->s_mount_opt);
1031 clear_bit(REISERFS_POSIXACL, &REISERFS_SB(s)->s_mount_opt);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001032 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001034 /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001035 if (reiserfs_posixacl(s))
1036 s->s_flags |= MS_POSIXACL;
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001037 else
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001038 s->s_flags &= ~MS_POSIXACL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001040 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041}