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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"
Fabian Frederick170939912014-08-08 14:21:12 -070048#include <linux/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{
Al Viro59551022016-01-22 15:40:57 -050067 BUG_ON(!inode_is_locked(dir));
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{
Al Viro59551022016-01-22 15:40:57 -050074 BUG_ON(!inode_is_locked(dir));
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;
Fabian Frederickf3fb9e22014-08-08 14:21:14 -070087
Al Viro59551022016-01-22 15:40:57 -050088 BUG_ON(!inode_is_locked(dir));
Jeff Mahoney6c176752009-03-30 14:02:34 -040089
Al Viro59551022016-01-22 15:40:57 -050090 inode_lock_nested(d_inode(dentry), I_MUTEX_CHILD);
Jeff Mahoney6c176752009-03-30 14:02:34 -040091 error = dir->i_op->unlink(dir, dentry);
Al Viro59551022016-01-22 15:40:57 -050092 inode_unlock(d_inode(dentry));
Jeff Mahoney6c176752009-03-30 14:02:34 -040093
94 if (!error)
95 d_delete(dentry);
96 return error;
97}
98
99static int xattr_rmdir(struct inode *dir, struct dentry *dentry)
100{
101 int error;
Fabian Frederickf3fb9e22014-08-08 14:21:14 -0700102
Al Viro59551022016-01-22 15:40:57 -0500103 BUG_ON(!inode_is_locked(dir));
Jeff Mahoney6c176752009-03-30 14:02:34 -0400104
Al Viro59551022016-01-22 15:40:57 -0500105 inode_lock_nested(d_inode(dentry), I_MUTEX_CHILD);
Jeff Mahoney6c176752009-03-30 14:02:34 -0400106 error = dir->i_op->rmdir(dir, dentry);
107 if (!error)
David Howells2b0143b2015-03-17 22:25:59 +0000108 d_inode(dentry)->i_flags |= S_DEAD;
Al Viro59551022016-01-22 15:40:57 -0500109 inode_unlock(d_inode(dentry));
Jeff Mahoney6c176752009-03-30 14:02:34 -0400110 if (!error)
111 d_delete(dentry);
Jeff Mahoney6c176752009-03-30 14:02:34 -0400112
113 return error;
114}
115
Jeff Mahoney6c176752009-03-30 14:02:34 -0400116#define xattr_may_create(flags) (!flags || flags & XATTR_CREATE)
117
Jeff Mahoney6c176752009-03-30 14:02:34 -0400118static struct dentry *open_xa_root(struct super_block *sb, int flags)
119{
120 struct dentry *privroot = REISERFS_SB(sb)->priv_root;
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400121 struct dentry *xaroot;
Fabian Frederickf3fb9e22014-08-08 14:21:14 -0700122
David Howells2b0143b2015-03-17 22:25:59 +0000123 if (d_really_is_negative(privroot))
Jeff Mahoney6c176752009-03-30 14:02:34 -0400124 return ERR_PTR(-ENODATA);
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400125
Al Viro59551022016-01-22 15:40:57 -0500126 inode_lock_nested(d_inode(privroot), I_MUTEX_XATTR);
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400127
128 xaroot = dget(REISERFS_SB(sb)->xattr_root);
Jeff Mahoneyceb5edc2009-05-17 01:02:02 -0400129 if (!xaroot)
130 xaroot = ERR_PTR(-ENODATA);
David Howells2b0143b2015-03-17 22:25:59 +0000131 else if (d_really_is_negative(xaroot)) {
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400132 int err = -ENODATA;
Fabian Frederickf3fb9e22014-08-08 14:21:14 -0700133
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400134 if (xattr_may_create(flags))
David Howells2b0143b2015-03-17 22:25:59 +0000135 err = xattr_mkdir(d_inode(privroot), xaroot, 0700);
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400136 if (err) {
137 dput(xaroot);
138 xaroot = ERR_PTR(err);
139 }
140 }
141
Al Viro59551022016-01-22 15:40:57 -0500142 inode_unlock(d_inode(privroot));
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400143 return xaroot;
Jeff Mahoney6c176752009-03-30 14:02:34 -0400144}
145
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700146static struct dentry *open_xa_dir(const struct inode *inode, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700148 struct dentry *xaroot, *xadir;
149 char namebuf[17];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
Jeff Mahoney6c176752009-03-30 14:02:34 -0400151 xaroot = open_xa_root(inode->i_sb, flags);
Jeff Mahoney9b7f3752007-04-23 14:41:17 -0700152 if (IS_ERR(xaroot))
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700153 return xaroot;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700155 snprintf(namebuf, sizeof(namebuf), "%X.%X",
156 le32_to_cpu(INODE_PKEY(inode)->k_objectid),
157 inode->i_generation);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
Al Viro59551022016-01-22 15:40:57 -0500159 inode_lock_nested(d_inode(xaroot), I_MUTEX_XATTR);
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400160
161 xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf));
David Howells2b0143b2015-03-17 22:25:59 +0000162 if (!IS_ERR(xadir) && d_really_is_negative(xadir)) {
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400163 int err = -ENODATA;
Fabian Frederickf3fb9e22014-08-08 14:21:14 -0700164
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400165 if (xattr_may_create(flags))
David Howells2b0143b2015-03-17 22:25:59 +0000166 err = xattr_mkdir(d_inode(xaroot), xadir, 0700);
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400167 if (err) {
168 dput(xadir);
169 xadir = ERR_PTR(err);
170 }
171 }
172
Al Viro59551022016-01-22 15:40:57 -0500173 inode_unlock(d_inode(xaroot));
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700174 dput(xaroot);
175 return xadir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176}
177
Jeff Mahoney098297b2014-04-23 10:00:36 -0400178/*
179 * The following are side effects of other operations that aren't explicitly
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400180 * modifying extended attributes. This includes operations such as permissions
Jeff Mahoney098297b2014-04-23 10:00:36 -0400181 * or ownership changes, object deletions, etc.
182 */
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400183struct reiserfs_dentry_buf {
Al Viro4acf3812013-05-17 22:42:17 -0400184 struct dir_context ctx;
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400185 struct dentry *xadir;
186 int count;
187 struct dentry *dentries[8];
188};
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400189
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400190static int
Miklos Szerediac7576f2014-10-30 17:37:34 +0100191fill_with_dentries(struct dir_context *ctx, const char *name, int namelen,
192 loff_t offset, u64 ino, unsigned int d_type)
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400193{
Miklos Szerediac7576f2014-10-30 17:37:34 +0100194 struct reiserfs_dentry_buf *dbuf =
195 container_of(ctx, struct reiserfs_dentry_buf, ctx);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400196 struct dentry *dentry;
Fabian Frederickf3fb9e22014-08-08 14:21:14 -0700197
Al Viro59551022016-01-22 15:40:57 -0500198 WARN_ON_ONCE(!inode_is_locked(d_inode(dbuf->xadir)));
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400199
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400200 if (dbuf->count == ARRAY_SIZE(dbuf->dentries))
201 return -ENOSPC;
202
Jan Kara35e5cbc2013-03-29 15:39:16 +0100203 if (name[0] == '.' && (namelen < 2 ||
204 (namelen == 2 && name[1] == '.')))
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400205 return 0;
206
207 dentry = lookup_one_len(name, dbuf->xadir, namelen);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400208 if (IS_ERR(dentry)) {
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400209 return PTR_ERR(dentry);
David Howells2b0143b2015-03-17 22:25:59 +0000210 } else if (d_really_is_negative(dentry)) {
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400211 /* A directory entry exists, but no file? */
212 reiserfs_error(dentry->d_sb, "xattr-20003",
Al Viroa4555892014-10-21 20:11:25 -0400213 "Corrupted directory: xattr %pd listed but "
214 "not found for file %pd.\n",
215 dentry, dbuf->xadir);
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400216 dput(dentry);
217 return -EIO;
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400218 }
219
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400220 dbuf->dentries[dbuf->count++] = dentry;
221 return 0;
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400222}
223
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400224static void
225cleanup_dentry_buf(struct reiserfs_dentry_buf *buf)
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400226{
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400227 int i;
Fabian Frederickf3fb9e22014-08-08 14:21:14 -0700228
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400229 for (i = 0; i < buf->count; i++)
230 if (buf->dentries[i])
231 dput(buf->dentries[i]);
232}
233
234static int reiserfs_for_each_xattr(struct inode *inode,
235 int (*action)(struct dentry *, void *),
236 void *data)
237{
238 struct dentry *dir;
239 int i, err = 0;
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400240 struct reiserfs_dentry_buf buf = {
Al Viro4acf3812013-05-17 22:42:17 -0400241 .ctx.actor = fill_with_dentries,
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400242 };
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400243
244 /* Skip out, an xattr has no xattrs associated with it */
245 if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1)
246 return 0;
247
Jeff Mahoney6c176752009-03-30 14:02:34 -0400248 dir = open_xa_dir(inode, XATTR_REPLACE);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400249 if (IS_ERR(dir)) {
250 err = PTR_ERR(dir);
251 goto out;
David Howells2b0143b2015-03-17 22:25:59 +0000252 } else if (d_really_is_negative(dir)) {
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400253 err = 0;
Jeff Mahoney6c176752009-03-30 14:02:34 -0400254 goto out_dir;
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400255 }
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400256
Al Viro59551022016-01-22 15:40:57 -0500257 inode_lock_nested(d_inode(dir), I_MUTEX_XATTR);
Frederic Weisbecker27026a02009-12-30 05:06:21 +0100258
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400259 buf.xadir = dir;
Al Virocd62cda2013-05-17 22:58:58 -0400260 while (1) {
David Howells2b0143b2015-03-17 22:25:59 +0000261 err = reiserfs_readdir_inode(d_inode(dir), &buf.ctx);
Al Virocd62cda2013-05-17 22:58:58 -0400262 if (err)
263 break;
264 if (!buf.count)
265 break;
266 for (i = 0; !err && i < buf.count && buf.dentries[i]; i++) {
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400267 struct dentry *dentry = buf.dentries[i];
268
David Howellse36cb0b2015-01-29 12:02:35 +0000269 if (!d_is_dir(dentry))
Al Virocd62cda2013-05-17 22:58:58 -0400270 err = action(dentry, data);
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400271
272 dput(dentry);
273 buf.dentries[i] = NULL;
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400274 }
Al Virocd62cda2013-05-17 22:58:58 -0400275 if (err)
276 break;
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400277 buf.count = 0;
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400278 }
Al Viro59551022016-01-22 15:40:57 -0500279 inode_unlock(d_inode(dir));
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400280
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400281 cleanup_dentry_buf(&buf);
282
283 if (!err) {
Jeff Mahoney098297b2014-04-23 10:00:36 -0400284 /*
285 * We start a transaction here to avoid a ABBA situation
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400286 * between the xattr root's i_mutex and the journal lock.
287 * This doesn't incur much additional overhead since the
288 * new transaction will just nest inside the
Jeff Mahoney098297b2014-04-23 10:00:36 -0400289 * outer transaction.
290 */
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400291 int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 +
292 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb);
293 struct reiserfs_transaction_handle th;
Fabian Frederickf3fb9e22014-08-08 14:21:14 -0700294
Jeff Mahoney4c051412013-08-08 17:27:19 -0400295 reiserfs_write_lock(inode->i_sb);
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400296 err = journal_begin(&th, inode->i_sb, blocks);
Jeff Mahoney4c051412013-08-08 17:27:19 -0400297 reiserfs_write_unlock(inode->i_sb);
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400298 if (!err) {
299 int jerror;
Fabian Frederickf3fb9e22014-08-08 14:21:14 -0700300
Al Viro59551022016-01-22 15:40:57 -0500301 inode_lock_nested(d_inode(dir->d_parent),
Jeff Mahoney4c051412013-08-08 17:27:19 -0400302 I_MUTEX_XATTR);
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400303 err = action(dir, data);
Jeff Mahoney4c051412013-08-08 17:27:19 -0400304 reiserfs_write_lock(inode->i_sb);
Jeff Mahoney58d85422014-04-23 10:00:38 -0400305 jerror = journal_end(&th);
Jeff Mahoney4c051412013-08-08 17:27:19 -0400306 reiserfs_write_unlock(inode->i_sb);
Al Viro59551022016-01-22 15:40:57 -0500307 inode_unlock(d_inode(dir->d_parent));
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400308 err = jerror ?: err;
309 }
310 }
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400311out_dir:
312 dput(dir);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400313out:
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400314 /* -ENODATA isn't an error */
315 if (err == -ENODATA)
316 err = 0;
317 return err;
318}
319
320static int delete_one_xattr(struct dentry *dentry, void *data)
321{
David Howells2b0143b2015-03-17 22:25:59 +0000322 struct inode *dir = d_inode(dentry->d_parent);
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400323
324 /* This is the xattr dir, handle specially. */
David Howellse36cb0b2015-01-29 12:02:35 +0000325 if (d_is_dir(dentry))
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400326 return xattr_rmdir(dir, dentry);
327
328 return xattr_unlink(dir, dentry);
329}
330
331static int chown_one_xattr(struct dentry *dentry, void *data)
332{
333 struct iattr *attrs = data;
Jeff Mahoney4a857012013-05-31 15:54:17 -0400334 int ia_valid = attrs->ia_valid;
335 int err;
336
337 /*
338 * We only want the ownership bits. Otherwise, we'll do
339 * things like change a directory to a regular file if
340 * ATTR_MODE is set.
341 */
342 attrs->ia_valid &= (ATTR_UID|ATTR_GID);
343 err = reiserfs_setattr(dentry, attrs);
344 attrs->ia_valid = ia_valid;
345
346 return err;
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400347}
348
349/* No i_mutex, but the inode is unconnected. */
350int reiserfs_delete_xattrs(struct inode *inode)
351{
352 int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL);
Fabian Frederickf3fb9e22014-08-08 14:21:14 -0700353
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400354 if (err)
355 reiserfs_warning(inode->i_sb, "jdm-20004",
356 "Couldn't delete all xattrs (%d)\n", err);
357 return err;
358}
359
360/* inode->i_mutex: down */
361int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs)
362{
363 int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs);
Fabian Frederickf3fb9e22014-08-08 14:21:14 -0700364
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400365 if (err)
366 reiserfs_warning(inode->i_sb, "jdm-20007",
367 "Couldn't chown all xattrs (%d)\n", err);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400368 return err;
369}
370
371#ifdef CONFIG_REISERFS_FS_XATTR
Jeff Mahoney098297b2014-04-23 10:00:36 -0400372/*
373 * Returns a dentry corresponding to a specific extended attribute file
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 * for the inode. If flags allow, the file is created. Otherwise, a
Jeff Mahoney098297b2014-04-23 10:00:36 -0400375 * valid or negative dentry, or an error is returned.
376 */
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400377static struct dentry *xattr_lookup(struct inode *inode, const char *name,
378 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700380 struct dentry *xadir, *xafile;
381 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700383 xadir = open_xa_dir(inode, flags);
Jeff Mahoney6c176752009-03-30 14:02:34 -0400384 if (IS_ERR(xadir))
David Howellse231c2e2008-02-07 00:15:26 -0800385 return ERR_CAST(xadir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
Al Viro59551022016-01-22 15:40:57 -0500387 inode_lock_nested(d_inode(xadir), I_MUTEX_XATTR);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700388 xafile = lookup_one_len(name, xadir, strlen(name));
389 if (IS_ERR(xafile)) {
Jeff Mahoney6c176752009-03-30 14:02:34 -0400390 err = PTR_ERR(xafile);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700391 goto out;
Jeff Mahoney6c176752009-03-30 14:02:34 -0400392 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
David Howells2b0143b2015-03-17 22:25:59 +0000394 if (d_really_is_positive(xafile) && (flags & XATTR_CREATE))
Jeff Mahoney6c176752009-03-30 14:02:34 -0400395 err = -EEXIST;
396
David Howells2b0143b2015-03-17 22:25:59 +0000397 if (d_really_is_negative(xafile)) {
Jeff Mahoney6c176752009-03-30 14:02:34 -0400398 err = -ENODATA;
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400399 if (xattr_may_create(flags))
David Howells2b0143b2015-03-17 22:25:59 +0000400 err = xattr_create(d_inode(xadir), xafile,
Jeff Mahoney6c176752009-03-30 14:02:34 -0400401 0700|S_IFREG);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700402 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
Jeff Mahoney6c176752009-03-30 14:02:34 -0400404 if (err)
405 dput(xafile);
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400406out:
Al Viro59551022016-01-22 15:40:57 -0500407 inode_unlock(d_inode(xadir));
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700408 dput(xadir);
409 if (err)
Jeff Mahoney6c176752009-03-30 14:02:34 -0400410 return ERR_PTR(err);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800411 return xafile;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412}
413
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414/* Internal operations on file data */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700415static inline void reiserfs_put_page(struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700417 kunmap(page);
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300418 put_page(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419}
420
Jeff Mahoneyec6ea562009-03-30 14:02:30 -0400421static struct page *reiserfs_get_page(struct inode *dir, size_t n)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700423 struct address_space *mapping = dir->i_mapping;
424 struct page *page;
Jeff Mahoney098297b2014-04-23 10:00:36 -0400425 /*
426 * We can deadlock if we try to free dentries,
427 * and an unlink/rmdir has just occurred - GFP_NOFS avoids this
428 */
Al Viroc4cdd032005-10-21 03:22:39 -0400429 mapping_set_gfp_mask(mapping, GFP_NOFS);
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300430 page = read_mapping_page(mapping, n >> PAGE_SHIFT, NULL);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700431 if (!IS_ERR(page)) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700432 kmap(page);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700433 if (PageError(page))
434 goto fail;
435 }
436 return page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
Jeff Mahoneycf776a72014-04-23 10:00:41 -0400438fail:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700439 reiserfs_put_page(page);
440 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441}
442
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700443static inline __u32 xattr_hash(const char *msg, int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700445 return csum_partial(msg, len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446}
447
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -0700448int reiserfs_commit_write(struct file *f, struct page *page,
449 unsigned from, unsigned to);
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -0700450
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400451static void update_ctime(struct inode *inode)
452{
Deepa Dinamani02027d42016-09-14 07:48:05 -0700453 struct timespec now = current_time(inode);
Fabian Frederickf3fb9e22014-08-08 14:21:14 -0700454
Al Viro1d3382cb2010-10-23 15:19:20 -0400455 if (inode_unhashed(inode) || !inode->i_nlink ||
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400456 timespec_equal(&inode->i_ctime, &now))
457 return;
458
Deepa Dinamani02027d42016-09-14 07:48:05 -0700459 inode->i_ctime = current_time(inode);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400460 mark_inode_dirty(inode);
461}
462
463static int lookup_and_delete_xattr(struct inode *inode, const char *name)
464{
465 int err = 0;
466 struct dentry *dentry, *xadir;
467
468 xadir = open_xa_dir(inode, XATTR_REPLACE);
469 if (IS_ERR(xadir))
470 return PTR_ERR(xadir);
471
Al Viro59551022016-01-22 15:40:57 -0500472 inode_lock_nested(d_inode(xadir), I_MUTEX_XATTR);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400473 dentry = lookup_one_len(name, xadir, strlen(name));
474 if (IS_ERR(dentry)) {
475 err = PTR_ERR(dentry);
476 goto out_dput;
477 }
478
David Howells2b0143b2015-03-17 22:25:59 +0000479 if (d_really_is_positive(dentry)) {
480 err = xattr_unlink(d_inode(xadir), dentry);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400481 update_ctime(inode);
482 }
483
484 dput(dentry);
485out_dput:
Al Viro59551022016-01-22 15:40:57 -0500486 inode_unlock(d_inode(xadir));
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400487 dput(xadir);
488 return err;
489}
490
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -0700491
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492/* Generic extended attribute operations that can be used by xa plugins */
493
494/*
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800495 * inode->i_mutex: down
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 */
497int
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400498reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th,
499 struct inode *inode, const char *name,
500 const void *buffer, size_t buffer_size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700502 int err = 0;
Jeff Mahoney3227e142008-02-15 14:37:22 -0800503 struct dentry *dentry;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700504 struct page *page;
505 char *data;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700506 size_t file_pos = 0;
507 size_t buffer_pos = 0;
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400508 size_t new_size;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700509 __u32 xahash = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700511 if (get_inode_sd_version(inode) == STAT_DATA_V1)
512 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513
Frederic Weisbecker4f3be1b2010-01-05 02:14:30 +0100514 if (!buffer) {
515 err = lookup_and_delete_xattr(inode, name);
Frederic Weisbecker4f3be1b2010-01-05 02:14:30 +0100516 return err;
517 }
518
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400519 dentry = xattr_lookup(inode, name, flags);
Jeff Mahoney4c051412013-08-08 17:27:19 -0400520 if (IS_ERR(dentry))
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400521 return PTR_ERR(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
Frederic Weisbeckerf3e22f42010-01-03 03:44:53 +0100523 down_write(&REISERFS_I(inode)->i_xattr_sem);
Frederic Weisbecker3f14fea2009-12-30 07:03:53 +0100524
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400525 xahash = xattr_hash(buffer, buffer_size);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700526 while (buffer_pos < buffer_size || buffer_pos == 0) {
527 size_t chunk;
528 size_t skip = 0;
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300529 size_t page_offset = (file_pos & (PAGE_SIZE - 1));
Fabian Frederickf3fb9e22014-08-08 14:21:14 -0700530
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300531 if (buffer_size - buffer_pos > PAGE_SIZE)
532 chunk = PAGE_SIZE;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700533 else
534 chunk = buffer_size - buffer_pos;
535
David Howells2b0143b2015-03-17 22:25:59 +0000536 page = reiserfs_get_page(d_inode(dentry), file_pos);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700537 if (IS_ERR(page)) {
538 err = PTR_ERR(page);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400539 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700540 }
541
542 lock_page(page);
543 data = page_address(page);
544
545 if (file_pos == 0) {
546 struct reiserfs_xattr_header *rxh;
Fabian Frederickf3fb9e22014-08-08 14:21:14 -0700547
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700548 skip = file_pos = sizeof(struct reiserfs_xattr_header);
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300549 if (chunk + skip > PAGE_SIZE)
550 chunk = PAGE_SIZE - skip;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700551 rxh = (struct reiserfs_xattr_header *)data;
552 rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC);
553 rxh->h_hash = cpu_to_le32(xahash);
554 }
555
Jeff Mahoney4c051412013-08-08 17:27:19 -0400556 reiserfs_write_lock(inode->i_sb);
Christoph Hellwigebdec242010-10-06 10:47:23 +0200557 err = __reiserfs_write_begin(page, page_offset, chunk + skip);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700558 if (!err) {
559 if (buffer)
560 memcpy(data + skip, buffer + buffer_pos, chunk);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800561 err = reiserfs_commit_write(NULL, page, page_offset,
562 page_offset + chunk +
563 skip);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700564 }
Jeff Mahoney4c051412013-08-08 17:27:19 -0400565 reiserfs_write_unlock(inode->i_sb);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700566 unlock_page(page);
567 reiserfs_put_page(page);
568 buffer_pos += chunk;
569 file_pos += chunk;
570 skip = 0;
571 if (err || buffer_size == 0 || !buffer)
572 break;
573 }
574
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400575 new_size = buffer_size + sizeof(struct reiserfs_xattr_header);
David Howells2b0143b2015-03-17 22:25:59 +0000576 if (!err && new_size < i_size_read(d_inode(dentry))) {
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400577 struct iattr newattrs = {
Deepa Dinamani02027d42016-09-14 07:48:05 -0700578 .ia_ctime = current_time(inode),
Jeff Mahoneyfb2162d2010-04-23 13:17:41 -0400579 .ia_size = new_size,
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400580 .ia_valid = ATTR_SIZE | ATTR_CTIME,
581 };
Frederic Weisbecker31370f62010-01-07 15:55:31 +0100582
Al Viro59551022016-01-22 15:40:57 -0500583 inode_lock_nested(d_inode(dentry), I_MUTEX_XATTR);
David Howells2b0143b2015-03-17 22:25:59 +0000584 inode_dio_wait(d_inode(dentry));
Frederic Weisbecker31370f62010-01-07 15:55:31 +0100585
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400586 err = reiserfs_setattr(dentry, &newattrs);
Al Viro59551022016-01-22 15:40:57 -0500587 inode_unlock(d_inode(dentry));
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400588 } else
589 update_ctime(inode);
590out_unlock:
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400591 up_write(&REISERFS_I(inode)->i_xattr_sem);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800592 dput(dentry);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400593 return err;
594}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700595
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400596/* We need to start a transaction to maintain lock ordering */
597int reiserfs_xattr_set(struct inode *inode, const char *name,
598 const void *buffer, size_t buffer_size, int flags)
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400599{
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400600
601 struct reiserfs_transaction_handle th;
602 int error, error2;
603 size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size);
604
605 if (!(flags & XATTR_REPLACE))
606 jbegin_count += reiserfs_xattr_jcreate_nblocks(inode);
607
608 reiserfs_write_lock(inode->i_sb);
609 error = journal_begin(&th, inode->i_sb, jbegin_count);
Jeff Mahoney4c051412013-08-08 17:27:19 -0400610 reiserfs_write_unlock(inode->i_sb);
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400611 if (error) {
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400612 return error;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700613 }
614
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400615 error = reiserfs_xattr_set_handle(&th, inode, name,
616 buffer, buffer_size, flags);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700617
Jeff Mahoney4c051412013-08-08 17:27:19 -0400618 reiserfs_write_lock(inode->i_sb);
Jeff Mahoney58d85422014-04-23 10:00:38 -0400619 error2 = journal_end(&th);
Jeff Mahoney4c051412013-08-08 17:27:19 -0400620 reiserfs_write_unlock(inode->i_sb);
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400621 if (error == 0)
622 error = error2;
Jeff Mahoney0ab26212009-03-30 14:02:39 -0400623
624 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625}
626
627/*
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800628 * inode->i_mutex: down
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 */
630int
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400631reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700632 size_t buffer_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700634 ssize_t err = 0;
Jeff Mahoney3227e142008-02-15 14:37:22 -0800635 struct dentry *dentry;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700636 size_t isize;
637 size_t file_pos = 0;
638 size_t buffer_pos = 0;
639 struct page *page;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700640 __u32 hash = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700642 if (name == NULL)
643 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
Jeff Mahoney098297b2014-04-23 10:00:36 -0400645 /*
646 * We can't have xattrs attached to v1 items since they don't have
647 * generation numbers
648 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700649 if (get_inode_sd_version(inode) == STAT_DATA_V1)
650 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400652 dentry = xattr_lookup(inode, name, XATTR_REPLACE);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800653 if (IS_ERR(dentry)) {
654 err = PTR_ERR(dentry);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700655 goto out;
656 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400658 down_read(&REISERFS_I(inode)->i_xattr_sem);
Jeff Mahoneyd9845612009-03-30 14:02:35 -0400659
David Howells2b0143b2015-03-17 22:25:59 +0000660 isize = i_size_read(d_inode(dentry));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700662 /* Just return the size needed */
663 if (buffer == NULL) {
664 err = isize - sizeof(struct reiserfs_xattr_header);
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400665 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700666 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700668 if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) {
669 err = -ERANGE;
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 while (file_pos < isize) {
674 size_t chunk;
675 char *data;
676 size_t skip = 0;
Fabian Frederickf3fb9e22014-08-08 14:21:14 -0700677
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300678 if (isize - file_pos > PAGE_SIZE)
679 chunk = PAGE_SIZE;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700680 else
681 chunk = isize - file_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682
David Howells2b0143b2015-03-17 22:25:59 +0000683 page = reiserfs_get_page(d_inode(dentry), file_pos);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700684 if (IS_ERR(page)) {
685 err = PTR_ERR(page);
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400686 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700687 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700689 lock_page(page);
690 data = page_address(page);
691 if (file_pos == 0) {
692 struct reiserfs_xattr_header *rxh =
693 (struct reiserfs_xattr_header *)data;
694 skip = file_pos = sizeof(struct reiserfs_xattr_header);
695 chunk -= skip;
696 /* Magic doesn't match up.. */
697 if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) {
698 unlock_page(page);
699 reiserfs_put_page(page);
Jeff Mahoney45b03d52009-03-30 14:02:21 -0400700 reiserfs_warning(inode->i_sb, "jdm-20001",
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700701 "Invalid magic for xattr (%s) "
702 "associated with %k", name,
703 INODE_PKEY(inode));
704 err = -EIO;
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400705 goto out_unlock;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700706 }
707 hash = le32_to_cpu(rxh->h_hash);
708 }
709 memcpy(buffer + buffer_pos, data + skip, chunk);
710 unlock_page(page);
711 reiserfs_put_page(page);
712 file_pos += chunk;
713 buffer_pos += chunk;
714 skip = 0;
715 }
716 err = isize - sizeof(struct reiserfs_xattr_header);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700718 if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) !=
719 hash) {
Jeff Mahoney45b03d52009-03-30 14:02:21 -0400720 reiserfs_warning(inode->i_sb, "jdm-20002",
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700721 "Invalid hash for xattr (%s) associated "
722 "with %k", name, INODE_PKEY(inode));
723 err = -EIO;
724 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400726out_unlock:
727 up_read(&REISERFS_I(inode)->i_xattr_sem);
Jeff Mahoney3227e142008-02-15 14:37:22 -0800728 dput(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400730out:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700731 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732}
733
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400734/*
735 * In order to implement different sets of xattr operations for each xattr
736 * prefix with the generic xattr API, a filesystem should create a
737 * null-terminated array of struct xattr_handler (one for each prefix) and
738 * hang a pointer to it off of the s_xattr field of the superblock.
739 *
740 * The generic_fooxattr() functions will use this list to dispatch xattr
741 * operations to the correct xattr_handler.
742 */
743#define for_each_xattr_handler(handlers, handler) \
744 for ((handler) = *(handlers)++; \
745 (handler) != NULL; \
746 (handler) = *(handlers)++)
747
748/* This is the implementation for the xattr plugin infrastructure */
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700749static inline const struct xattr_handler *
750find_xattr_handler_prefix(const struct xattr_handler **handlers,
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400751 const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752{
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700753 const struct xattr_handler *xah;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400755 if (!handlers)
756 return NULL;
757
758 for_each_xattr_handler(handlers, xah) {
Andreas Gruenbacher98e9cb52015-12-02 14:44:36 +0100759 const char *prefix = xattr_prefix(xah);
760 if (strncmp(prefix, name, strlen(prefix)) == 0)
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400761 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 }
763
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400764 return xah;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765}
766
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400767struct listxattr_buf {
Al Viro4acf3812013-05-17 22:42:17 -0400768 struct dir_context ctx;
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400769 size_t size;
770 size_t pos;
771 char *buf;
Christoph Hellwig431547b2009-11-13 09:52:56 +0000772 struct dentry *dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773};
774
Miklos Szerediac7576f2014-10-30 17:37:34 +0100775static int listxattr_filler(struct dir_context *ctx, const char *name,
776 int namelen, loff_t offset, u64 ino,
777 unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778{
Miklos Szerediac7576f2014-10-30 17:37:34 +0100779 struct listxattr_buf *b =
780 container_of(ctx, struct listxattr_buf, ctx);
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400781 size_t size;
Fabian Frederickf3fb9e22014-08-08 14:21:14 -0700782
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400783 if (name[0] != '.' ||
784 (namelen != 1 && (name[1] != '.' || namelen != 2))) {
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700785 const struct xattr_handler *handler;
Fabian Frederickf3fb9e22014-08-08 14:21:14 -0700786
Christoph Hellwig431547b2009-11-13 09:52:56 +0000787 handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr,
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400788 name);
Andreas Gruenbacher764a5c62015-12-02 14:44:43 +0100789 if (!handler /* Unsupported xattr name */ ||
790 (handler->list && !handler->list(b->dentry)))
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400791 return 0;
Andreas Gruenbacher764a5c62015-12-02 14:44:43 +0100792 size = namelen + 1;
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400793 if (b->buf) {
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400794 if (size > b->size)
795 return -ERANGE;
Andreas Gruenbacher764a5c62015-12-02 14:44:43 +0100796 memcpy(b->buf + b->pos, name, namelen);
797 b->buf[b->pos + namelen] = 0;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700798 }
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400799 b->pos += size;
800 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700801 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700803
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804/*
805 * Inode operation listxattr()
806 *
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400807 * We totally ignore the generic listxattr here because it would be stupid
808 * not to. Since the xattrs are organized in a directory, we can just
809 * readdir to find them.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700811ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700813 struct dentry *dir;
814 int err = 0;
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400815 struct listxattr_buf buf = {
Al Viro4acf3812013-05-17 22:42:17 -0400816 .ctx.actor = listxattr_filler,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000817 .dentry = dentry,
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400818 .buf = buffer,
819 .size = buffer ? size : 0,
820 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821
David Howells2b0143b2015-03-17 22:25:59 +0000822 if (d_really_is_negative(dentry))
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700823 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824
Jeff Mahoney677c9b22009-05-05 15:30:17 -0400825 if (!dentry->d_sb->s_xattr ||
David Howells2b0143b2015-03-17 22:25:59 +0000826 get_inode_sd_version(d_inode(dentry)) == STAT_DATA_V1)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700827 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828
David Howells2b0143b2015-03-17 22:25:59 +0000829 dir = open_xa_dir(d_inode(dentry), XATTR_REPLACE);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700830 if (IS_ERR(dir)) {
831 err = PTR_ERR(dir);
832 if (err == -ENODATA)
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400833 err = 0; /* Not an error if there aren't any xattrs */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700834 goto out;
835 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836
Al Viro59551022016-01-22 15:40:57 -0500837 inode_lock_nested(d_inode(dir), I_MUTEX_XATTR);
David Howells2b0143b2015-03-17 22:25:59 +0000838 err = reiserfs_readdir_inode(d_inode(dir), &buf.ctx);
Al Viro59551022016-01-22 15:40:57 -0500839 inode_unlock(d_inode(dir));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400841 if (!err)
842 err = buf.pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843
Jeff Mahoney3227e142008-02-15 14:37:22 -0800844 dput(dir);
Jeff Mahoney8b6dd722009-03-30 14:02:36 -0400845out:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700846 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847}
848
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400849static int create_privroot(struct dentry *dentry)
850{
851 int err;
David Howells2b0143b2015-03-17 22:25:59 +0000852 struct inode *inode = d_inode(dentry->d_parent);
Fabian Frederickf3fb9e22014-08-08 14:21:14 -0700853
Al Viro59551022016-01-22 15:40:57 -0500854 WARN_ON_ONCE(!inode_is_locked(inode));
Jeff Mahoney5a6059c2009-05-01 12:11:12 -0400855
Jeff Mahoney6c176752009-03-30 14:02:34 -0400856 err = xattr_mkdir(inode, dentry, 0700);
David Howells2b0143b2015-03-17 22:25:59 +0000857 if (err || d_really_is_negative(dentry)) {
Al Viroedcc37a2009-05-03 06:00:05 -0400858 reiserfs_warning(dentry->d_sb, "jdm-20006",
859 "xattrs/ACLs enabled and couldn't "
860 "find/create .reiserfs_priv. "
861 "Failing mount.");
862 return -EOPNOTSUPP;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700863 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864
David Howells2b0143b2015-03-17 22:25:59 +0000865 d_inode(dentry)->i_flags |= S_PRIVATE;
Al Viroedcc37a2009-05-03 06:00:05 -0400866 reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr "
867 "storage.\n", PRIVROOT_NAME);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868
Al Viroedcc37a2009-05-03 06:00:05 -0400869 return 0;
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400870}
871
Jeff Mahoney12abb352009-05-17 01:02:01 -0400872#else
873int __init reiserfs_xattr_register_handlers(void) { return 0; }
874void reiserfs_xattr_unregister_handlers(void) {}
875static int create_privroot(struct dentry *dentry) { return 0; }
876#endif
877
878/* Actual operations that are exported to VFS-land */
Sachin Kamatda02eb72012-08-23 17:28:57 +0200879static const struct xattr_handler *reiserfs_xattr_handlers[] = {
Jeff Mahoney12abb352009-05-17 01:02:01 -0400880#ifdef CONFIG_REISERFS_FS_XATTR
881 &reiserfs_xattr_user_handler,
882 &reiserfs_xattr_trusted_handler,
883#endif
884#ifdef CONFIG_REISERFS_FS_SECURITY
885 &reiserfs_xattr_security_handler,
886#endif
887#ifdef CONFIG_REISERFS_FS_POSIX_ACL
Christoph Hellwig47f70d02013-12-20 05:16:49 -0800888 &posix_acl_access_xattr_handler,
889 &posix_acl_default_xattr_handler,
Jeff Mahoney12abb352009-05-17 01:02:01 -0400890#endif
891 NULL
892};
893
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400894static int xattr_mount_check(struct super_block *s)
895{
Jeff Mahoney098297b2014-04-23 10:00:36 -0400896 /*
897 * We need generation numbers to ensure that the oid mapping is correct
898 * v3.5 filesystems don't have them.
899 */
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400900 if (old_format_only(s)) {
901 if (reiserfs_xattrs_optional(s)) {
Jeff Mahoney098297b2014-04-23 10:00:36 -0400902 /*
903 * Old format filesystem, but optional xattrs have
904 * been enabled. Error out.
905 */
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400906 reiserfs_warning(s, "jdm-2005",
907 "xattrs/ACLs not supported "
908 "on pre-v3.6 format filesystems. "
909 "Failing mount.");
910 return -EOPNOTSUPP;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700911 }
912 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400914 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915}
916
Al Viro10556cb2011-06-20 19:28:19 -0400917int reiserfs_permission(struct inode *inode, int mask)
Jeff Mahoneyb83674c2009-05-17 01:02:03 -0400918{
919 /*
920 * We don't do permission checks on the internal objects.
921 * Permissions are determined by the "owning" object.
922 */
923 if (IS_PRIVATE(inode))
924 return 0;
925
Al Viro2830ba72011-06-20 19:16:29 -0400926 return generic_permission(inode, mask);
Jeff Mahoneyb83674c2009-05-17 01:02:03 -0400927}
928
Al Viro0b728e12012-06-10 16:03:43 -0400929static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930{
Jeff Mahoneycac36f72010-04-23 13:17:37 -0400931 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932}
933
Al Viroe16404e2009-02-20 05:55:13 +0000934static const struct dentry_operations xattr_lookup_poison_ops = {
Jeff Mahoneycac36f72010-04-23 13:17:37 -0400935 .d_revalidate = xattr_hide_revalidate,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936};
937
Al Viroedcc37a2009-05-03 06:00:05 -0400938int reiserfs_lookup_privroot(struct super_block *s)
939{
940 struct dentry *dentry;
941 int err = 0;
942
943 /* If we don't have the privroot located yet - go find it */
Al Viro59551022016-01-22 15:40:57 -0500944 inode_lock(d_inode(s->s_root));
Al Viroedcc37a2009-05-03 06:00:05 -0400945 dentry = lookup_one_len(PRIVROOT_NAME, s->s_root,
946 strlen(PRIVROOT_NAME));
947 if (!IS_ERR(dentry)) {
948 REISERFS_SB(s)->priv_root = dentry;
Nick Pigginfb045ad2011-01-07 17:49:55 +1100949 d_set_d_op(dentry, &xattr_lookup_poison_ops);
David Howells2b0143b2015-03-17 22:25:59 +0000950 if (d_really_is_positive(dentry))
951 d_inode(dentry)->i_flags |= S_PRIVATE;
Al Viroedcc37a2009-05-03 06:00:05 -0400952 } else
953 err = PTR_ERR(dentry);
Al Viro59551022016-01-22 15:40:57 -0500954 inode_unlock(d_inode(s->s_root));
Al Viroedcc37a2009-05-03 06:00:05 -0400955
956 return err;
957}
958
Jeff Mahoney098297b2014-04-23 10:00:36 -0400959/*
960 * We need to take a copy of the mount flags since things like
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 * MS_RDONLY don't get set until *after* we're called.
Jeff Mahoney098297b2014-04-23 10:00:36 -0400962 * mount_flags != mount_options
963 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700964int reiserfs_xattr_init(struct super_block *s, int mount_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700966 int err = 0;
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400967 struct dentry *privroot = REISERFS_SB(s)->priv_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400969 err = xattr_mount_check(s);
970 if (err)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700971 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972
David Howells2b0143b2015-03-17 22:25:59 +0000973 if (d_really_is_negative(privroot) && !(mount_flags & MS_RDONLY)) {
Al Viro59551022016-01-22 15:40:57 -0500974 inode_lock(d_inode(s->s_root));
Al Viroedcc37a2009-05-03 06:00:05 -0400975 err = create_privroot(REISERFS_SB(s)->priv_root);
Al Viro59551022016-01-22 15:40:57 -0500976 inode_unlock(d_inode(s->s_root));
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700977 }
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400978
David Howells2b0143b2015-03-17 22:25:59 +0000979 if (d_really_is_positive(privroot)) {
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400980 s->s_xattr = reiserfs_xattr_handlers;
Al Viro59551022016-01-22 15:40:57 -0500981 inode_lock(d_inode(privroot));
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400982 if (!REISERFS_SB(s)->xattr_root) {
983 struct dentry *dentry;
Fabian Frederickf3fb9e22014-08-08 14:21:14 -0700984
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400985 dentry = lookup_one_len(XAROOT_NAME, privroot,
986 strlen(XAROOT_NAME));
987 if (!IS_ERR(dentry))
988 REISERFS_SB(s)->xattr_root = dentry;
989 else
990 err = PTR_ERR(dentry);
991 }
Al Viro59551022016-01-22 15:40:57 -0500992 inode_unlock(d_inode(privroot));
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -0400993 }
Jeff Mahoney48b32a32009-03-30 14:02:38 -0400994
Jeff Mahoneya72bdb12009-03-30 14:02:33 -0400995error:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700996 if (err) {
Jeff Mahoneya228bf82014-04-23 10:00:42 -0400997 clear_bit(REISERFS_XATTRS_USER, &REISERFS_SB(s)->s_mount_opt);
998 clear_bit(REISERFS_POSIXACL, &REISERFS_SB(s)->s_mount_opt);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700999 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001001 /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001002 if (reiserfs_posixacl(s))
1003 s->s_flags |= MS_POSIXACL;
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001004 else
Jeff Mahoneyab17c4f2009-05-05 15:30:15 -04001005 s->s_flags &= ~MS_POSIXACL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001007 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008}