blob: c8178b7b92123d3474fb40979ee2c596c432d099 [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.
30 */
31
32#include <linux/reiserfs_fs.h>
Randy Dunlap16f7e0f2006-01-11 12:17:46 -080033#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/dcache.h>
35#include <linux/namei.h>
36#include <linux/errno.h>
37#include <linux/fs.h>
38#include <linux/file.h>
39#include <linux/pagemap.h>
40#include <linux/xattr.h>
41#include <linux/reiserfs_xattr.h>
42#include <linux/reiserfs_acl.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <asm/uaccess.h>
Al Viro3277c392006-11-14 21:13:53 -080044#include <net/checksum.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <linux/smp_lock.h>
46#include <linux/stat.h>
47#include <asm/semaphore.h>
48
49#define FL_READONLY 128
50#define FL_DIR_SEM_HELD 256
51#define PRIVROOT_NAME ".reiserfs_priv"
52#define XAROOT_NAME "xattrs"
53
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070054static struct reiserfs_xattr_handler *find_xattr_handler_prefix(const char
55 *prefix);
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Jeff Mahoney9b7f3752007-04-23 14:41:17 -070057/* Returns the dentry referring to the root of the extended attribute
58 * directory tree. If it has already been retrieved, it is used. If it
59 * hasn't been created and the flags indicate creation is allowed, we
60 * attempt to create it. On error, we return a pointer-encoded error.
61 */
62static struct dentry *get_xa_root(struct super_block *sb, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070063{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070064 struct dentry *privroot = dget(REISERFS_SB(sb)->priv_root);
65 struct dentry *xaroot;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070067 /* This needs to be created at mount-time */
68 if (!privroot)
Jeff Mahoney9b7f3752007-04-23 14:41:17 -070069 return ERR_PTR(-ENODATA);
70
71 mutex_lock(&privroot->d_inode->i_mutex);
72 if (REISERFS_SB(sb)->xattr_root) {
73 xaroot = dget(REISERFS_SB(sb)->xattr_root);
74 goto out;
75 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070077 xaroot = lookup_one_len(XAROOT_NAME, privroot, strlen(XAROOT_NAME));
78 if (IS_ERR(xaroot)) {
79 goto out;
80 } else if (!xaroot->d_inode) {
Jeff Mahoney9b7f3752007-04-23 14:41:17 -070081 int err = -ENODATA;
82 if (flags == 0 || flags & XATTR_CREATE)
83 err = privroot->d_inode->i_op->mkdir(privroot->d_inode,
84 xaroot, 0700);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070085 if (err) {
86 dput(xaroot);
Jeff Mahoney9b7f3752007-04-23 14:41:17 -070087 xaroot = ERR_PTR(err);
88 goto out;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070089 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070090 }
Jeff Mahoney9b7f3752007-04-23 14:41:17 -070091 REISERFS_SB(sb)->xattr_root = dget(xaroot);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070093 out:
Jeff Mahoney9b7f3752007-04-23 14:41:17 -070094 mutex_unlock(&privroot->d_inode->i_mutex);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070095 dput(privroot);
96 return xaroot;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097}
98
Linus Torvalds1da177e2005-04-16 15:20:36 -070099/* Opens the directory corresponding to the inode's extended attribute store.
100 * If flags allow, the tree to the directory may be created. If creation is
101 * prohibited, -ENODATA is returned. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700102static struct dentry *open_xa_dir(const struct inode *inode, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700104 struct dentry *xaroot, *xadir;
105 char namebuf[17];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
Jeff Mahoney9b7f3752007-04-23 14:41:17 -0700107 xaroot = get_xa_root(inode->i_sb, flags);
108 if (IS_ERR(xaroot))
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700109 return xaroot;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700111 /* ok, we have xaroot open */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700112 snprintf(namebuf, sizeof(namebuf), "%X.%X",
113 le32_to_cpu(INODE_PKEY(inode)->k_objectid),
114 inode->i_generation);
115 xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf));
116 if (IS_ERR(xadir)) {
117 dput(xaroot);
118 return xadir;
119 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700121 if (!xadir->d_inode) {
122 int err;
123 if (flags == 0 || flags & XATTR_CREATE) {
124 /* Although there is nothing else trying to create this directory,
125 * another directory with the same hash may be created, so we need
126 * to protect against that */
127 err =
128 xaroot->d_inode->i_op->mkdir(xaroot->d_inode, xadir,
129 0700);
130 if (err) {
131 dput(xaroot);
132 dput(xadir);
133 return ERR_PTR(err);
134 }
135 }
136 if (!xadir->d_inode) {
137 dput(xaroot);
138 dput(xadir);
139 return ERR_PTR(-ENODATA);
140 }
141 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700143 dput(xaroot);
144 return xadir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145}
146
147/* Returns a dentry corresponding to a specific extended attribute file
148 * for the inode. If flags allow, the file is created. Otherwise, a
149 * valid or negative dentry, or an error is returned. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700150static struct dentry *get_xa_file_dentry(const struct inode *inode,
151 const char *name, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700153 struct dentry *xadir, *xafile;
154 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700156 xadir = open_xa_dir(inode, flags);
157 if (IS_ERR(xadir)) {
158 return ERR_PTR(PTR_ERR(xadir));
159 } else if (xadir && !xadir->d_inode) {
160 dput(xadir);
161 return ERR_PTR(-ENODATA);
162 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700164 xafile = lookup_one_len(name, xadir, strlen(name));
165 if (IS_ERR(xafile)) {
166 dput(xadir);
167 return ERR_PTR(PTR_ERR(xafile));
168 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700170 if (xafile->d_inode) { /* file exists */
171 if (flags & XATTR_CREATE) {
172 err = -EEXIST;
173 dput(xafile);
174 goto out;
175 }
176 } else if (flags & XATTR_REPLACE || flags & FL_READONLY) {
177 goto out;
178 } else {
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800179 /* inode->i_mutex is down, so nothing else can try to create
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700180 * the same xattr */
181 err = xadir->d_inode->i_op->create(xadir->d_inode, xafile,
182 0700 | S_IFREG, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700184 if (err) {
185 dput(xafile);
186 goto out;
187 }
188 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700190 out:
191 dput(xadir);
192 if (err)
193 xafile = ERR_PTR(err);
194 return xafile;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195}
196
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197/* Opens a file pointer to the attribute associated with inode */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700198static struct file *open_xa_file(const struct inode *inode, const char *name,
199 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700201 struct dentry *xafile;
202 struct file *fp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700204 xafile = get_xa_file_dentry(inode, name, flags);
205 if (IS_ERR(xafile))
206 return ERR_PTR(PTR_ERR(xafile));
207 else if (!xafile->d_inode) {
208 dput(xafile);
209 return ERR_PTR(-ENODATA);
210 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700212 fp = dentry_open(xafile, NULL, O_RDWR);
213 /* dentry_open dputs the dentry if it fails */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700215 return fp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216}
217
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218/*
219 * this is very similar to fs/reiserfs/dir.c:reiserfs_readdir, but
220 * we need to drop the path before calling the filldir struct. That
221 * would be a big performance hit to the non-xattr case, so I've copied
222 * the whole thing for now. --clm
223 *
224 * the big difference is that I go backwards through the directory,
225 * and don't mess with f->f_pos, but the idea is the same. Do some
226 * action on each and every entry in the directory.
227 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800228 * we're called with i_mutex held, so there are no worries about the directory
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 * changing underneath us.
230 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700231static int __xattr_readdir(struct file *filp, void *dirent, filldir_t filldir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232{
Josef Sipek1fc5adb2006-12-08 02:37:33 -0800233 struct inode *inode = filp->f_path.dentry->d_inode;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700234 struct cpu_key pos_key; /* key of current position in the directory (key of directory entry) */
235 INITIALIZE_PATH(path_to_entry);
236 struct buffer_head *bh;
237 int entry_num;
238 struct item_head *ih, tmp_ih;
239 int search_res;
240 char *local_buf;
241 loff_t next_pos;
242 char small_buf[32]; /* avoid kmalloc if we can */
243 struct reiserfs_de_head *deh;
244 int d_reclen;
245 char *d_name;
246 off_t d_off;
247 ino_t d_ino;
248 struct reiserfs_dir_entry de;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700250 /* form key for search the next directory entry using f_pos field of
251 file structure */
252 next_pos = max_reiserfs_offset(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700254 while (1) {
255 research:
256 if (next_pos <= DOT_DOT_OFFSET)
257 break;
258 make_cpu_key(&pos_key, inode, next_pos, TYPE_DIRENTRY, 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700260 search_res =
261 search_by_entry_key(inode->i_sb, &pos_key, &path_to_entry,
262 &de);
263 if (search_res == IO_ERROR) {
264 // FIXME: we could just skip part of directory which could
265 // not be read
266 pathrelse(&path_to_entry);
267 return -EIO;
268 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700270 if (search_res == NAME_NOT_FOUND)
271 de.de_entry_num--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700273 set_de_name_and_namelen(&de);
274 entry_num = de.de_entry_num;
275 deh = &(de.de_deh[entry_num]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700277 bh = de.de_bh;
278 ih = de.de_ih;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700280 if (!is_direntry_le_ih(ih)) {
281 reiserfs_warning(inode->i_sb, "not direntry %h", ih);
282 break;
283 }
284 copy_item_head(&tmp_ih, ih);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700286 /* we must have found item, that is item of this directory, */
287 RFALSE(COMP_SHORT_KEYS(&(ih->ih_key), &pos_key),
288 "vs-9000: found item %h does not match to dir we readdir %K",
289 ih, &pos_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700291 if (deh_offset(deh) <= DOT_DOT_OFFSET) {
292 break;
293 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700295 /* look for the previous entry in the directory */
296 next_pos = deh_offset(deh) - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700298 if (!de_visible(deh))
299 /* it is hidden entry */
300 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700302 d_reclen = entry_length(bh, ih, entry_num);
303 d_name = B_I_DEH_ENTRY_FILE_NAME(bh, ih, deh);
304 d_off = deh_offset(deh);
305 d_ino = deh_objectid(deh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700307 if (!d_name[d_reclen - 1])
308 d_reclen = strlen(d_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700310 if (d_reclen > REISERFS_MAX_NAME(inode->i_sb->s_blocksize)) {
311 /* too big to send back to VFS */
312 continue;
313 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700315 /* Ignore the .reiserfs_priv entry */
316 if (reiserfs_xattrs(inode->i_sb) &&
317 !old_format_only(inode->i_sb) &&
318 deh_objectid(deh) ==
319 le32_to_cpu(INODE_PKEY
320 (REISERFS_SB(inode->i_sb)->priv_root->d_inode)->
321 k_objectid))
322 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700324 if (d_reclen <= 32) {
325 local_buf = small_buf;
326 } else {
Pekka Enbergd739b422006-02-01 03:06:43 -0800327 local_buf = kmalloc(d_reclen, GFP_NOFS);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700328 if (!local_buf) {
329 pathrelse(&path_to_entry);
330 return -ENOMEM;
331 }
332 if (item_moved(&tmp_ih, &path_to_entry)) {
Pekka Enbergd739b422006-02-01 03:06:43 -0800333 kfree(local_buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700335 /* sigh, must retry. Do this same offset again */
336 next_pos = d_off;
337 goto research;
338 }
339 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700341 // Note, that we copy name to user space via temporary
342 // buffer (local_buf) because filldir will block if
343 // user space buffer is swapped out. At that time
344 // entry can move to somewhere else
345 memcpy(local_buf, d_name, d_reclen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700347 /* the filldir function might need to start transactions,
348 * or do who knows what. Release the path now that we've
349 * copied all the important stuff out of the deh
350 */
351 pathrelse(&path_to_entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700353 if (filldir(dirent, local_buf, d_reclen, d_off, d_ino,
354 DT_UNKNOWN) < 0) {
355 if (local_buf != small_buf) {
Pekka Enbergd739b422006-02-01 03:06:43 -0800356 kfree(local_buf);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700357 }
358 goto end;
359 }
360 if (local_buf != small_buf) {
Pekka Enbergd739b422006-02-01 03:06:43 -0800361 kfree(local_buf);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700362 }
363 } /* while */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700365 end:
366 pathrelse(&path_to_entry);
367 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368}
369
370/*
371 * this could be done with dedicated readdir ops for the xattr files,
372 * but I want to get something working asap
373 * this is stolen from vfs_readdir
374 *
375 */
376static
377int xattr_readdir(struct file *file, filldir_t filler, void *buf)
378{
Josef Sipek1fc5adb2006-12-08 02:37:33 -0800379 struct inode *inode = file->f_path.dentry->d_inode;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700380 int res = -ENOTDIR;
381 if (!file->f_op || !file->f_op->readdir)
382 goto out;
Ingo Molnar4df46242006-08-27 01:23:56 -0700383 mutex_lock_nested(&inode->i_mutex, I_MUTEX_XATTR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384// down(&inode->i_zombie);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700385 res = -ENOENT;
386 if (!IS_DEADDIR(inode)) {
387 lock_kernel();
388 res = __xattr_readdir(file, buf, filler);
389 unlock_kernel();
390 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391// up(&inode->i_zombie);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800392 mutex_unlock(&inode->i_mutex);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700393 out:
394 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395}
396
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397/* Internal operations on file data */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700398static inline void reiserfs_put_page(struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700400 kunmap(page);
401 page_cache_release(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402}
403
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700404static struct page *reiserfs_get_page(struct inode *dir, unsigned long n)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700406 struct address_space *mapping = dir->i_mapping;
407 struct page *page;
408 /* We can deadlock if we try to free dentries,
409 and an unlink/rmdir has just occured - GFP_NOFS avoids this */
Al Viroc4cdd032005-10-21 03:22:39 -0400410 mapping_set_gfp_mask(mapping, GFP_NOFS);
Pekka Enberg090d2b12006-06-23 02:05:08 -0700411 page = read_mapping_page(mapping, n, NULL);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700412 if (!IS_ERR(page)) {
413 wait_on_page_locked(page);
414 kmap(page);
415 if (!PageUptodate(page))
416 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700418 if (PageError(page))
419 goto fail;
420 }
421 return page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700423 fail:
424 reiserfs_put_page(page);
425 return ERR_PTR(-EIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426}
427
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700428static inline __u32 xattr_hash(const char *msg, int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700430 return csum_partial(msg, len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431}
432
433/* Generic extended attribute operations that can be used by xa plugins */
434
435/*
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800436 * inode->i_mutex: down
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 */
438int
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700439reiserfs_xattr_set(struct inode *inode, const char *name, const void *buffer,
440 size_t buffer_size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700442 int err = 0;
443 struct file *fp;
444 struct page *page;
445 char *data;
446 struct address_space *mapping;
447 size_t file_pos = 0;
448 size_t buffer_pos = 0;
449 struct inode *xinode;
450 struct iattr newattrs;
451 __u32 xahash = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700453 if (get_inode_sd_version(inode) == STAT_DATA_V1)
454 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700456 /* Empty xattrs are ok, they're just empty files, no hash */
457 if (buffer && buffer_size)
458 xahash = xattr_hash(buffer, buffer_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700460 open_file:
461 fp = open_xa_file(inode, name, flags);
462 if (IS_ERR(fp)) {
463 err = PTR_ERR(fp);
464 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466
Josef Sipek1fc5adb2006-12-08 02:37:33 -0800467 xinode = fp->f_path.dentry->d_inode;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700468 REISERFS_I(inode)->i_flags |= i_has_xattr_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700470 /* we need to copy it off.. */
471 if (xinode->i_nlink > 1) {
472 fput(fp);
473 err = reiserfs_xattr_del(inode, name);
474 if (err < 0)
475 goto out;
476 /* We just killed the old one, we're not replacing anymore */
477 if (flags & XATTR_REPLACE)
478 flags &= ~XATTR_REPLACE;
479 goto open_file;
480 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700482 /* Resize it so we're ok to write there */
483 newattrs.ia_size = buffer_size;
484 newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800485 mutex_lock(&xinode->i_mutex);
Josef Sipek1fc5adb2006-12-08 02:37:33 -0800486 err = notify_change(fp->f_path.dentry, &newattrs);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700487 if (err)
488 goto out_filp;
489
490 mapping = xinode->i_mapping;
491 while (buffer_pos < buffer_size || buffer_pos == 0) {
492 size_t chunk;
493 size_t skip = 0;
494 size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1));
495 if (buffer_size - buffer_pos > PAGE_CACHE_SIZE)
496 chunk = PAGE_CACHE_SIZE;
497 else
498 chunk = buffer_size - buffer_pos;
499
500 page = reiserfs_get_page(xinode, file_pos >> PAGE_CACHE_SHIFT);
501 if (IS_ERR(page)) {
502 err = PTR_ERR(page);
503 goto out_filp;
504 }
505
506 lock_page(page);
507 data = page_address(page);
508
509 if (file_pos == 0) {
510 struct reiserfs_xattr_header *rxh;
511 skip = file_pos = sizeof(struct reiserfs_xattr_header);
512 if (chunk + skip > PAGE_CACHE_SIZE)
513 chunk = PAGE_CACHE_SIZE - skip;
514 rxh = (struct reiserfs_xattr_header *)data;
515 rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC);
516 rxh->h_hash = cpu_to_le32(xahash);
517 }
518
519 err = mapping->a_ops->prepare_write(fp, page, page_offset,
520 page_offset + chunk + skip);
521 if (!err) {
522 if (buffer)
523 memcpy(data + skip, buffer + buffer_pos, chunk);
524 err =
525 mapping->a_ops->commit_write(fp, page, page_offset,
526 page_offset + chunk +
527 skip);
528 }
529 unlock_page(page);
530 reiserfs_put_page(page);
531 buffer_pos += chunk;
532 file_pos += chunk;
533 skip = 0;
534 if (err || buffer_size == 0 || !buffer)
535 break;
536 }
537
538 /* We can't mark the inode dirty if it's not hashed. This is the case
539 * when we're inheriting the default ACL. If we dirty it, the inode
540 * gets marked dirty, but won't (ever) make it onto the dirty list until
541 * it's synced explicitly to clear I_DIRTY. This is bad. */
542 if (!hlist_unhashed(&inode->i_hash)) {
543 inode->i_ctime = CURRENT_TIME_SEC;
544 mark_inode_dirty(inode);
545 }
546
547 out_filp:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800548 mutex_unlock(&xinode->i_mutex);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700549 fput(fp);
550
551 out:
552 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553}
554
555/*
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800556 * inode->i_mutex: down
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 */
558int
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700559reiserfs_xattr_get(const struct inode *inode, const char *name, void *buffer,
560 size_t buffer_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700562 ssize_t err = 0;
563 struct file *fp;
564 size_t isize;
565 size_t file_pos = 0;
566 size_t buffer_pos = 0;
567 struct page *page;
568 struct inode *xinode;
569 __u32 hash = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700571 if (name == NULL)
572 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700574 /* We can't have xattrs attached to v1 items since they don't have
575 * generation numbers */
576 if (get_inode_sd_version(inode) == STAT_DATA_V1)
577 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700579 fp = open_xa_file(inode, name, FL_READONLY);
580 if (IS_ERR(fp)) {
581 err = PTR_ERR(fp);
582 goto out;
583 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
Josef Sipek1fc5adb2006-12-08 02:37:33 -0800585 xinode = fp->f_path.dentry->d_inode;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700586 isize = xinode->i_size;
587 REISERFS_I(inode)->i_flags |= i_has_xattr_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700589 /* Just return the size needed */
590 if (buffer == NULL) {
591 err = isize - sizeof(struct reiserfs_xattr_header);
592 goto out_dput;
593 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700595 if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) {
596 err = -ERANGE;
597 goto out_dput;
598 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700600 while (file_pos < isize) {
601 size_t chunk;
602 char *data;
603 size_t skip = 0;
604 if (isize - file_pos > PAGE_CACHE_SIZE)
605 chunk = PAGE_CACHE_SIZE;
606 else
607 chunk = isize - file_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700609 page = reiserfs_get_page(xinode, file_pos >> PAGE_CACHE_SHIFT);
610 if (IS_ERR(page)) {
611 err = PTR_ERR(page);
612 goto out_dput;
613 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700615 lock_page(page);
616 data = page_address(page);
617 if (file_pos == 0) {
618 struct reiserfs_xattr_header *rxh =
619 (struct reiserfs_xattr_header *)data;
620 skip = file_pos = sizeof(struct reiserfs_xattr_header);
621 chunk -= skip;
622 /* Magic doesn't match up.. */
623 if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) {
624 unlock_page(page);
625 reiserfs_put_page(page);
626 reiserfs_warning(inode->i_sb,
627 "Invalid magic for xattr (%s) "
628 "associated with %k", name,
629 INODE_PKEY(inode));
630 err = -EIO;
631 goto out_dput;
632 }
633 hash = le32_to_cpu(rxh->h_hash);
634 }
635 memcpy(buffer + buffer_pos, data + skip, chunk);
636 unlock_page(page);
637 reiserfs_put_page(page);
638 file_pos += chunk;
639 buffer_pos += chunk;
640 skip = 0;
641 }
642 err = isize - sizeof(struct reiserfs_xattr_header);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700644 if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) !=
645 hash) {
646 reiserfs_warning(inode->i_sb,
647 "Invalid hash for xattr (%s) associated "
648 "with %k", name, INODE_PKEY(inode));
649 err = -EIO;
650 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700652 out_dput:
653 fput(fp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700655 out:
656 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657}
658
659static int
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700660__reiserfs_xattr_del(struct dentry *xadir, const char *name, int namelen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700662 struct dentry *dentry;
663 struct inode *dir = xadir->d_inode;
664 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700666 dentry = lookup_one_len(name, xadir, namelen);
667 if (IS_ERR(dentry)) {
668 err = PTR_ERR(dentry);
669 goto out;
670 } else if (!dentry->d_inode) {
671 err = -ENODATA;
672 goto out_file;
673 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700675 /* Skip directories.. */
676 if (S_ISDIR(dentry->d_inode->i_mode))
677 goto out_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700679 if (!is_reiserfs_priv_object(dentry->d_inode)) {
680 reiserfs_warning(dir->i_sb, "OID %08x [%.*s/%.*s] doesn't have "
681 "priv flag set [parent is %sset].",
682 le32_to_cpu(INODE_PKEY(dentry->d_inode)->
683 k_objectid), xadir->d_name.len,
684 xadir->d_name.name, namelen, name,
685 is_reiserfs_priv_object(xadir->
686 d_inode) ? "" :
687 "not ");
688 dput(dentry);
689 return -EIO;
690 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700692 err = dir->i_op->unlink(dir, dentry);
693 if (!err)
694 d_delete(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700696 out_file:
697 dput(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700699 out:
700 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701}
702
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700703int reiserfs_xattr_del(struct inode *inode, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700705 struct dentry *dir;
706 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700708 dir = open_xa_dir(inode, FL_READONLY);
709 if (IS_ERR(dir)) {
710 err = PTR_ERR(dir);
711 goto out;
712 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700714 err = __reiserfs_xattr_del(dir, name, strlen(name));
715 dput(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700717 if (!err) {
718 inode->i_ctime = CURRENT_TIME_SEC;
719 mark_inode_dirty(inode);
720 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700722 out:
723 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724}
725
726/* The following are side effects of other operations that aren't explicitly
727 * modifying extended attributes. This includes operations such as permissions
728 * or ownership changes, object deletions, etc. */
729
730static int
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700731reiserfs_delete_xattrs_filler(void *buf, const char *name, int namelen,
David Howellsafefdbb2006-10-03 01:13:46 -0700732 loff_t offset, u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700734 struct dentry *xadir = (struct dentry *)buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700736 return __reiserfs_xattr_del(xadir, name, namelen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737
738}
739
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800740/* This is called w/ inode->i_mutex downed */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700741int reiserfs_delete_xattrs(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700743 struct file *fp;
744 struct dentry *dir, *root;
745 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700747 /* Skip out, an xattr has no xattrs associated with it */
748 if (is_reiserfs_priv_object(inode) ||
749 get_inode_sd_version(inode) == STAT_DATA_V1 ||
750 !reiserfs_xattrs(inode->i_sb)) {
751 return 0;
752 }
753 reiserfs_read_lock_xattrs(inode->i_sb);
754 dir = open_xa_dir(inode, FL_READONLY);
755 reiserfs_read_unlock_xattrs(inode->i_sb);
756 if (IS_ERR(dir)) {
757 err = PTR_ERR(dir);
758 goto out;
759 } else if (!dir->d_inode) {
760 dput(dir);
761 return 0;
762 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700764 fp = dentry_open(dir, NULL, O_RDWR);
765 if (IS_ERR(fp)) {
766 err = PTR_ERR(fp);
767 /* dentry_open dputs the dentry if it fails */
768 goto out;
769 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700771 lock_kernel();
772 err = xattr_readdir(fp, reiserfs_delete_xattrs_filler, dir);
773 if (err) {
774 unlock_kernel();
775 goto out_dir;
776 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700778 /* Leftovers besides . and .. -- that's not good. */
779 if (dir->d_inode->i_nlink <= 2) {
Jeff Mahoney9b7f3752007-04-23 14:41:17 -0700780 root = get_xa_root(inode->i_sb, XATTR_REPLACE);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700781 reiserfs_write_lock_xattrs(inode->i_sb);
782 err = vfs_rmdir(root->d_inode, dir);
783 reiserfs_write_unlock_xattrs(inode->i_sb);
784 dput(root);
785 } else {
786 reiserfs_warning(inode->i_sb,
787 "Couldn't remove all entries in directory");
788 }
789 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700791 out_dir:
792 fput(fp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700794 out:
795 if (!err)
796 REISERFS_I(inode)->i_flags =
797 REISERFS_I(inode)->i_flags & ~i_has_xattr_dir;
798 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799}
800
801struct reiserfs_chown_buf {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700802 struct inode *inode;
803 struct dentry *xadir;
804 struct iattr *attrs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805};
806
807/* XXX: If there is a better way to do this, I'd love to hear about it */
808static int
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700809reiserfs_chown_xattrs_filler(void *buf, const char *name, int namelen,
David Howellsafefdbb2006-10-03 01:13:46 -0700810 loff_t offset, u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700812 struct reiserfs_chown_buf *chown_buf = (struct reiserfs_chown_buf *)buf;
813 struct dentry *xafile, *xadir = chown_buf->xadir;
814 struct iattr *attrs = chown_buf->attrs;
815 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700817 xafile = lookup_one_len(name, xadir, namelen);
818 if (IS_ERR(xafile))
819 return PTR_ERR(xafile);
820 else if (!xafile->d_inode) {
821 dput(xafile);
822 return -ENODATA;
823 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700825 if (!S_ISDIR(xafile->d_inode->i_mode))
826 err = notify_change(xafile, attrs);
827 dput(xafile);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700829 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830}
831
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700832int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700834 struct file *fp;
835 struct dentry *dir;
836 int err = 0;
837 struct reiserfs_chown_buf buf;
838 unsigned int ia_valid = attrs->ia_valid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700840 /* Skip out, an xattr has no xattrs associated with it */
841 if (is_reiserfs_priv_object(inode) ||
842 get_inode_sd_version(inode) == STAT_DATA_V1 ||
843 !reiserfs_xattrs(inode->i_sb)) {
844 return 0;
845 }
846 reiserfs_read_lock_xattrs(inode->i_sb);
847 dir = open_xa_dir(inode, FL_READONLY);
848 reiserfs_read_unlock_xattrs(inode->i_sb);
849 if (IS_ERR(dir)) {
850 if (PTR_ERR(dir) != -ENODATA)
851 err = PTR_ERR(dir);
852 goto out;
853 } else if (!dir->d_inode) {
854 dput(dir);
855 goto out;
856 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700858 fp = dentry_open(dir, NULL, O_RDWR);
859 if (IS_ERR(fp)) {
860 err = PTR_ERR(fp);
861 /* dentry_open dputs the dentry if it fails */
862 goto out;
863 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700865 lock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700867 attrs->ia_valid &= (ATTR_UID | ATTR_GID | ATTR_CTIME);
868 buf.xadir = dir;
869 buf.attrs = attrs;
870 buf.inode = inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700872 err = xattr_readdir(fp, reiserfs_chown_xattrs_filler, &buf);
873 if (err) {
874 unlock_kernel();
875 goto out_dir;
876 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700878 err = notify_change(dir, attrs);
879 unlock_kernel();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700881 out_dir:
882 fput(fp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700884 out:
885 attrs->ia_valid = ia_valid;
886 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887}
888
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889/* Actual operations that are exported to VFS-land */
890
891/*
892 * Inode operation getxattr()
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800893 * Preliminary locking: we down dentry->d_inode->i_mutex
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 */
895ssize_t
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700896reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer,
897 size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700899 struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(name);
900 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700902 if (!xah || !reiserfs_xattrs(dentry->d_sb) ||
903 get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
904 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700906 reiserfs_read_lock_xattr_i(dentry->d_inode);
907 reiserfs_read_lock_xattrs(dentry->d_sb);
908 err = xah->get(dentry->d_inode, name, buffer, size);
909 reiserfs_read_unlock_xattrs(dentry->d_sb);
910 reiserfs_read_unlock_xattr_i(dentry->d_inode);
911 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912}
913
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914/*
915 * Inode operation setxattr()
916 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800917 * dentry->d_inode->i_mutex down
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 */
919int
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700920reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value,
921 size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700923 struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(name);
924 int err;
925 int lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700927 if (!xah || !reiserfs_xattrs(dentry->d_sb) ||
928 get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
929 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700931 reiserfs_write_lock_xattr_i(dentry->d_inode);
932 lock = !has_xattr_dir(dentry->d_inode);
933 if (lock)
934 reiserfs_write_lock_xattrs(dentry->d_sb);
935 else
936 reiserfs_read_lock_xattrs(dentry->d_sb);
937 err = xah->set(dentry->d_inode, name, value, size, flags);
938 if (lock)
939 reiserfs_write_unlock_xattrs(dentry->d_sb);
940 else
941 reiserfs_read_unlock_xattrs(dentry->d_sb);
942 reiserfs_write_unlock_xattr_i(dentry->d_inode);
943 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944}
945
946/*
947 * Inode operation removexattr()
948 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800949 * dentry->d_inode->i_mutex down
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700951int reiserfs_removexattr(struct dentry *dentry, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700953 int err;
954 struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700956 if (!xah || !reiserfs_xattrs(dentry->d_sb) ||
957 get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
958 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700960 reiserfs_write_lock_xattr_i(dentry->d_inode);
961 reiserfs_read_lock_xattrs(dentry->d_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700963 /* Deletion pre-operation */
964 if (xah->del) {
965 err = xah->del(dentry->d_inode, name);
966 if (err)
967 goto out;
968 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700970 err = reiserfs_xattr_del(dentry->d_inode, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700972 dentry->d_inode->i_ctime = CURRENT_TIME_SEC;
973 mark_inode_dirty(dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700975 out:
976 reiserfs_read_unlock_xattrs(dentry->d_sb);
977 reiserfs_write_unlock_xattr_i(dentry->d_inode);
978 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979}
980
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981/* This is what filldir will use:
982 * r_pos will always contain the amount of space required for the entire
983 * list. If r_pos becomes larger than r_size, we need more space and we
984 * return an error indicating this. If r_pos is less than r_size, then we've
985 * filled the buffer successfully and we return success */
986struct reiserfs_listxattr_buf {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700987 int r_pos;
988 int r_size;
989 char *r_buf;
990 struct inode *r_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991};
992
993static int
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700994reiserfs_listxattr_filler(void *buf, const char *name, int namelen,
David Howellsafefdbb2006-10-03 01:13:46 -0700995 loff_t offset, u64 ino, unsigned int d_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700997 struct reiserfs_listxattr_buf *b = (struct reiserfs_listxattr_buf *)buf;
998 int len = 0;
999 if (name[0] != '.'
1000 || (namelen != 1 && (name[1] != '.' || namelen != 2))) {
1001 struct reiserfs_xattr_handler *xah =
1002 find_xattr_handler_prefix(name);
1003 if (!xah)
1004 return 0; /* Unsupported xattr name, skip it */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001006 /* We call ->list() twice because the operation isn't required to just
1007 * return the name back - we want to make sure we have enough space */
1008 len += xah->list(b->r_inode, name, namelen, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001010 if (len) {
1011 if (b->r_pos + len + 1 <= b->r_size) {
1012 char *p = b->r_buf + b->r_pos;
1013 p += xah->list(b->r_inode, name, namelen, p);
1014 *p++ = '\0';
1015 }
1016 b->r_pos += len + 1;
1017 }
1018 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001020 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021}
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001022
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023/*
1024 * Inode operation listxattr()
1025 *
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001026 * Preliminary locking: we down dentry->d_inode->i_mutex
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001028ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001030 struct file *fp;
1031 struct dentry *dir;
1032 int err = 0;
1033 struct reiserfs_listxattr_buf buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001035 if (!dentry->d_inode)
1036 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001038 if (!reiserfs_xattrs(dentry->d_sb) ||
1039 get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
1040 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001042 reiserfs_read_lock_xattr_i(dentry->d_inode);
1043 reiserfs_read_lock_xattrs(dentry->d_sb);
1044 dir = open_xa_dir(dentry->d_inode, FL_READONLY);
1045 reiserfs_read_unlock_xattrs(dentry->d_sb);
1046 if (IS_ERR(dir)) {
1047 err = PTR_ERR(dir);
1048 if (err == -ENODATA)
1049 err = 0; /* Not an error if there aren't any xattrs */
1050 goto out;
1051 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001053 fp = dentry_open(dir, NULL, O_RDWR);
1054 if (IS_ERR(fp)) {
1055 err = PTR_ERR(fp);
1056 /* dentry_open dputs the dentry if it fails */
1057 goto out;
1058 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001060 buf.r_buf = buffer;
1061 buf.r_size = buffer ? size : 0;
1062 buf.r_pos = 0;
1063 buf.r_inode = dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001065 REISERFS_I(dentry->d_inode)->i_flags |= i_has_xattr_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001067 err = xattr_readdir(fp, reiserfs_listxattr_filler, &buf);
1068 if (err)
1069 goto out_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001071 if (buf.r_pos > buf.r_size && buffer != NULL)
1072 err = -ERANGE;
1073 else
1074 err = buf.r_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001076 out_dir:
1077 fput(fp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001079 out:
1080 reiserfs_read_unlock_xattr_i(dentry->d_inode);
1081 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082}
1083
1084/* This is the implementation for the xattr plugin infrastructure */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001085static struct list_head xattr_handlers = LIST_HEAD_INIT(xattr_handlers);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086static DEFINE_RWLOCK(handler_lock);
1087
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001088static struct reiserfs_xattr_handler *find_xattr_handler_prefix(const char
1089 *prefix)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001091 struct reiserfs_xattr_handler *xah = NULL;
1092 struct list_head *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001094 read_lock(&handler_lock);
1095 list_for_each(p, &xattr_handlers) {
1096 xah = list_entry(p, struct reiserfs_xattr_handler, handlers);
1097 if (strncmp(xah->prefix, prefix, strlen(xah->prefix)) == 0)
1098 break;
1099 xah = NULL;
1100 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001102 read_unlock(&handler_lock);
1103 return xah;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104}
1105
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001106static void __unregister_handlers(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001108 struct reiserfs_xattr_handler *xah;
1109 struct list_head *p, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001111 list_for_each_safe(p, tmp, &xattr_handlers) {
1112 xah = list_entry(p, struct reiserfs_xattr_handler, handlers);
1113 if (xah->exit)
1114 xah->exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001116 list_del_init(p);
1117 }
1118 INIT_LIST_HEAD(&xattr_handlers);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119}
1120
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001121int __init reiserfs_xattr_register_handlers(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001123 int err = 0;
1124 struct reiserfs_xattr_handler *xah;
1125 struct list_head *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001127 write_lock(&handler_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001129 /* If we're already initialized, nothing to do */
1130 if (!list_empty(&xattr_handlers)) {
1131 write_unlock(&handler_lock);
1132 return 0;
1133 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001135 /* Add the handlers */
1136 list_add_tail(&user_handler.handlers, &xattr_handlers);
1137 list_add_tail(&trusted_handler.handlers, &xattr_handlers);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138#ifdef CONFIG_REISERFS_FS_SECURITY
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001139 list_add_tail(&security_handler.handlers, &xattr_handlers);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140#endif
1141#ifdef CONFIG_REISERFS_FS_POSIX_ACL
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001142 list_add_tail(&posix_acl_access_handler.handlers, &xattr_handlers);
1143 list_add_tail(&posix_acl_default_handler.handlers, &xattr_handlers);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144#endif
1145
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001146 /* Run initializers, if available */
1147 list_for_each(p, &xattr_handlers) {
1148 xah = list_entry(p, struct reiserfs_xattr_handler, handlers);
1149 if (xah->init) {
1150 err = xah->init();
1151 if (err) {
1152 list_del_init(p);
1153 break;
1154 }
1155 }
1156 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001158 /* Clean up other handlers, if any failed */
1159 if (err)
1160 __unregister_handlers();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001162 write_unlock(&handler_lock);
1163 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164}
1165
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001166void reiserfs_xattr_unregister_handlers(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001168 write_lock(&handler_lock);
1169 __unregister_handlers();
1170 write_unlock(&handler_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171}
1172
1173/* This will catch lookups from the fs root to .reiserfs_priv */
1174static int
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001175xattr_lookup_poison(struct dentry *dentry, struct qstr *q1, struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001177 struct dentry *priv_root = REISERFS_SB(dentry->d_sb)->priv_root;
1178 if (name->len == priv_root->d_name.len &&
1179 name->hash == priv_root->d_name.hash &&
1180 !memcmp(name->name, priv_root->d_name.name, name->len)) {
1181 return -ENOENT;
1182 } else if (q1->len == name->len &&
1183 !memcmp(q1->name, name->name, name->len))
1184 return 0;
1185 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186}
1187
1188static struct dentry_operations xattr_lookup_poison_ops = {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001189 .d_compare = xattr_lookup_poison,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190};
1191
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192/* We need to take a copy of the mount flags since things like
1193 * MS_RDONLY don't get set until *after* we're called.
1194 * mount_flags != mount_options */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001195int reiserfs_xattr_init(struct super_block *s, int mount_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001197 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001199 /* We need generation numbers to ensure that the oid mapping is correct
1200 * v3.5 filesystems don't have them. */
1201 if (!old_format_only(s)) {
1202 set_bit(REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt));
1203 } else if (reiserfs_xattrs_optional(s)) {
1204 /* Old format filesystem, but optional xattrs have been enabled
1205 * at mount time. Error out. */
1206 reiserfs_warning(s, "xattrs/ACLs not supported on pre v3.6 "
1207 "format filesystem. Failing mount.");
1208 err = -EOPNOTSUPP;
1209 goto error;
1210 } else {
1211 /* Old format filesystem, but no optional xattrs have been enabled. This
1212 * means we silently disable xattrs on the filesystem. */
1213 clear_bit(REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt));
1214 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001216 /* If we don't have the privroot located yet - go find it */
1217 if (reiserfs_xattrs(s) && !REISERFS_SB(s)->priv_root) {
1218 struct dentry *dentry;
1219 dentry = lookup_one_len(PRIVROOT_NAME, s->s_root,
1220 strlen(PRIVROOT_NAME));
1221 if (!IS_ERR(dentry)) {
1222 if (!(mount_flags & MS_RDONLY) && !dentry->d_inode) {
1223 struct inode *inode = dentry->d_parent->d_inode;
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001224 mutex_lock(&inode->i_mutex);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001225 err = inode->i_op->mkdir(inode, dentry, 0700);
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08001226 mutex_unlock(&inode->i_mutex);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001227 if (err) {
1228 dput(dentry);
1229 dentry = NULL;
1230 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001232 if (dentry && dentry->d_inode)
1233 reiserfs_warning(s,
1234 "Created %s on %s - reserved for "
1235 "xattr storage.",
1236 PRIVROOT_NAME,
1237 reiserfs_bdevname
1238 (inode->i_sb));
1239 } else if (!dentry->d_inode) {
1240 dput(dentry);
1241 dentry = NULL;
1242 }
1243 } else
1244 err = PTR_ERR(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001246 if (!err && dentry) {
1247 s->s_root->d_op = &xattr_lookup_poison_ops;
1248 reiserfs_mark_inode_private(dentry->d_inode);
1249 REISERFS_SB(s)->priv_root = dentry;
1250 } else if (!(mount_flags & MS_RDONLY)) { /* xattrs are unavailable */
1251 /* If we're read-only it just means that the dir hasn't been
1252 * created. Not an error -- just no xattrs on the fs. We'll
1253 * check again if we go read-write */
1254 reiserfs_warning(s, "xattrs/ACLs enabled and couldn't "
1255 "find/create .reiserfs_priv. Failing mount.");
1256 err = -EOPNOTSUPP;
1257 }
1258 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001260 error:
1261 /* This is only nonzero if there was an error initializing the xattr
1262 * directory or if there is a condition where we don't support them. */
1263 if (err) {
1264 clear_bit(REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt));
1265 clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt));
1266 clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt));
1267 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001269 /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */
1270 s->s_flags = s->s_flags & ~MS_POSIXACL;
1271 if (reiserfs_posixacl(s))
1272 s->s_flags |= MS_POSIXACL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001274 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275}
1276
Christoph Hellwigec191572006-02-01 03:06:46 -08001277static int reiserfs_check_acl(struct inode *inode, int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278{
Christoph Hellwigec191572006-02-01 03:06:46 -08001279 struct posix_acl *acl;
1280 int error = -EAGAIN; /* do regular unix permission checks by default */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281
Christoph Hellwigec191572006-02-01 03:06:46 -08001282 reiserfs_read_lock_xattr_i(inode);
1283 reiserfs_read_lock_xattrs(inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284
Christoph Hellwigec191572006-02-01 03:06:46 -08001285 acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
1286
1287 reiserfs_read_unlock_xattrs(inode->i_sb);
1288 reiserfs_read_unlock_xattr_i(inode);
1289
1290 if (acl) {
1291 if (!IS_ERR(acl)) {
1292 error = posix_acl_permission(inode, acl, mask);
1293 posix_acl_release(acl);
1294 } else if (PTR_ERR(acl) != -ENODATA)
1295 error = PTR_ERR(acl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296 }
1297
Christoph Hellwigec191572006-02-01 03:06:46 -08001298 return error;
1299}
1300
1301int reiserfs_permission(struct inode *inode, int mask, struct nameidata *nd)
1302{
1303 /*
1304 * We don't do permission checks on the internal objects.
1305 * Permissions are determined by the "owning" object.
1306 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001307 if (is_reiserfs_priv_object(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308 return 0;
1309
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 /*
Christoph Hellwigec191572006-02-01 03:06:46 -08001311 * Stat data v1 doesn't support ACLs.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 */
Christoph Hellwigec191572006-02-01 03:06:46 -08001313 if (get_inode_sd_version(inode) == STAT_DATA_V1)
1314 return generic_permission(inode, mask, NULL);
1315 else
1316 return generic_permission(inode, mask, reiserfs_check_acl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317}