Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 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 Mahoney | d984561 | 2009-03-30 14:02:35 -0400 | [diff] [blame] | 30 | * |
| 31 | * Locking works like so: |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 32 | * Directory components (xattr root, xattr dir) are protectd by their i_mutex. |
| 33 | * The xattrs themselves are protected by the xattr_sem. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | */ |
| 35 | |
| 36 | #include <linux/reiserfs_fs.h> |
Randy Dunlap | 16f7e0f | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 37 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include <linux/dcache.h> |
| 39 | #include <linux/namei.h> |
| 40 | #include <linux/errno.h> |
| 41 | #include <linux/fs.h> |
| 42 | #include <linux/file.h> |
| 43 | #include <linux/pagemap.h> |
| 44 | #include <linux/xattr.h> |
| 45 | #include <linux/reiserfs_xattr.h> |
| 46 | #include <linux/reiserfs_acl.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <asm/uaccess.h> |
Al Viro | 3277c39 | 2006-11-14 21:13:53 -0800 | [diff] [blame] | 48 | #include <net/checksum.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #include <linux/stat.h> |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 50 | #include <linux/quotaops.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | #define PRIVROOT_NAME ".reiserfs_priv" |
| 53 | #define XAROOT_NAME "xattrs" |
| 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 56 | /* Helpers for inode ops. We do this so that we don't have all the VFS |
| 57 | * overhead and also for proper i_mutex annotation. |
| 58 | * dir->i_mutex must be held for all of them. */ |
Jeff Mahoney | 3a355cc | 2009-03-30 16:49:58 -0400 | [diff] [blame] | 59 | #ifdef CONFIG_REISERFS_FS_XATTR |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 60 | static int xattr_create(struct inode *dir, struct dentry *dentry, int mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | { |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 62 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
Linus Torvalds | e1c5024 | 2009-03-30 12:29:21 -0700 | [diff] [blame] | 63 | vfs_dq_init(dir); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 64 | return dir->i_op->create(dir, dentry, mode, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | } |
Jeff Mahoney | 3a355cc | 2009-03-30 16:49:58 -0400 | [diff] [blame] | 66 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 68 | static int xattr_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
| 69 | { |
| 70 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
Linus Torvalds | e1c5024 | 2009-03-30 12:29:21 -0700 | [diff] [blame] | 71 | vfs_dq_init(dir); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 72 | return dir->i_op->mkdir(dir, dentry, mode); |
| 73 | } |
| 74 | |
| 75 | /* We use I_MUTEX_CHILD here to silence lockdep. It's safe because xattr |
| 76 | * mutation ops aren't called during rename or splace, which are the |
| 77 | * only other users of I_MUTEX_CHILD. It violates the ordering, but that's |
| 78 | * better than allocating another subclass just for this code. */ |
| 79 | static int xattr_unlink(struct inode *dir, struct dentry *dentry) |
| 80 | { |
| 81 | int error; |
| 82 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
Linus Torvalds | e1c5024 | 2009-03-30 12:29:21 -0700 | [diff] [blame] | 83 | vfs_dq_init(dir); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 84 | |
Frederic Weisbecker | 4dd8596 | 2009-12-30 07:26:28 +0100 | [diff] [blame^] | 85 | reiserfs_mutex_lock_nested_safe(&dentry->d_inode->i_mutex, |
| 86 | I_MUTEX_CHILD, dir->i_sb); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 87 | error = dir->i_op->unlink(dir, dentry); |
| 88 | mutex_unlock(&dentry->d_inode->i_mutex); |
| 89 | |
| 90 | if (!error) |
| 91 | d_delete(dentry); |
| 92 | return error; |
| 93 | } |
| 94 | |
| 95 | static int xattr_rmdir(struct inode *dir, struct dentry *dentry) |
| 96 | { |
| 97 | int error; |
| 98 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
Linus Torvalds | e1c5024 | 2009-03-30 12:29:21 -0700 | [diff] [blame] | 99 | vfs_dq_init(dir); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 100 | |
| 101 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD); |
| 102 | dentry_unhash(dentry); |
| 103 | error = dir->i_op->rmdir(dir, dentry); |
| 104 | if (!error) |
| 105 | dentry->d_inode->i_flags |= S_DEAD; |
| 106 | mutex_unlock(&dentry->d_inode->i_mutex); |
| 107 | if (!error) |
| 108 | d_delete(dentry); |
| 109 | dput(dentry); |
| 110 | |
| 111 | return error; |
| 112 | } |
| 113 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 114 | #define xattr_may_create(flags) (!flags || flags & XATTR_CREATE) |
| 115 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 116 | static struct dentry *open_xa_root(struct super_block *sb, int flags) |
| 117 | { |
| 118 | struct dentry *privroot = REISERFS_SB(sb)->priv_root; |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 119 | struct dentry *xaroot; |
| 120 | if (!privroot->d_inode) |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 121 | return ERR_PTR(-ENODATA); |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 122 | |
| 123 | mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR); |
| 124 | |
| 125 | xaroot = dget(REISERFS_SB(sb)->xattr_root); |
Jeff Mahoney | ceb5edc | 2009-05-17 01:02:02 -0400 | [diff] [blame] | 126 | if (!xaroot) |
| 127 | xaroot = ERR_PTR(-ENODATA); |
| 128 | else if (!xaroot->d_inode) { |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 129 | int err = -ENODATA; |
| 130 | if (xattr_may_create(flags)) |
| 131 | err = xattr_mkdir(privroot->d_inode, xaroot, 0700); |
| 132 | if (err) { |
| 133 | dput(xaroot); |
| 134 | xaroot = ERR_PTR(err); |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | mutex_unlock(&privroot->d_inode->i_mutex); |
| 139 | return xaroot; |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 140 | } |
| 141 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 142 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 144 | struct dentry *xaroot, *xadir; |
| 145 | char namebuf[17]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 147 | xaroot = open_xa_root(inode->i_sb, flags); |
Jeff Mahoney | 9b7f375 | 2007-04-23 14:41:17 -0700 | [diff] [blame] | 148 | if (IS_ERR(xaroot)) |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 149 | return xaroot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 151 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
| 152 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), |
| 153 | inode->i_generation); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 155 | mutex_lock_nested(&xaroot->d_inode->i_mutex, I_MUTEX_XATTR); |
| 156 | |
| 157 | xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf)); |
| 158 | if (!IS_ERR(xadir) && !xadir->d_inode) { |
| 159 | int err = -ENODATA; |
| 160 | if (xattr_may_create(flags)) |
| 161 | err = xattr_mkdir(xaroot->d_inode, xadir, 0700); |
| 162 | if (err) { |
| 163 | dput(xadir); |
| 164 | xadir = ERR_PTR(err); |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | mutex_unlock(&xaroot->d_inode->i_mutex); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 169 | dput(xaroot); |
| 170 | return xadir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | } |
| 172 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 173 | /* The following are side effects of other operations that aren't explicitly |
| 174 | * modifying extended attributes. This includes operations such as permissions |
| 175 | * or ownership changes, object deletions, etc. */ |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 176 | struct reiserfs_dentry_buf { |
| 177 | struct dentry *xadir; |
| 178 | int count; |
| 179 | struct dentry *dentries[8]; |
| 180 | }; |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 181 | |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 182 | static int |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 183 | fill_with_dentries(void *buf, const char *name, int namelen, loff_t offset, |
| 184 | u64 ino, unsigned int d_type) |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 185 | { |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 186 | struct reiserfs_dentry_buf *dbuf = buf; |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 187 | struct dentry *dentry; |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 188 | WARN_ON_ONCE(!mutex_is_locked(&dbuf->xadir->d_inode->i_mutex)); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 189 | |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 190 | if (dbuf->count == ARRAY_SIZE(dbuf->dentries)) |
| 191 | return -ENOSPC; |
| 192 | |
| 193 | if (name[0] == '.' && (name[1] == '\0' || |
| 194 | (name[1] == '.' && name[2] == '\0'))) |
| 195 | return 0; |
| 196 | |
| 197 | dentry = lookup_one_len(name, dbuf->xadir, namelen); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 198 | if (IS_ERR(dentry)) { |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 199 | return PTR_ERR(dentry); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 200 | } else if (!dentry->d_inode) { |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 201 | /* A directory entry exists, but no file? */ |
| 202 | reiserfs_error(dentry->d_sb, "xattr-20003", |
| 203 | "Corrupted directory: xattr %s listed but " |
| 204 | "not found for file %s.\n", |
| 205 | dentry->d_name.name, dbuf->xadir->d_name.name); |
| 206 | dput(dentry); |
| 207 | return -EIO; |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 208 | } |
| 209 | |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 210 | dbuf->dentries[dbuf->count++] = dentry; |
| 211 | return 0; |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 212 | } |
| 213 | |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 214 | static void |
| 215 | cleanup_dentry_buf(struct reiserfs_dentry_buf *buf) |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 216 | { |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 217 | int i; |
| 218 | for (i = 0; i < buf->count; i++) |
| 219 | if (buf->dentries[i]) |
| 220 | dput(buf->dentries[i]); |
| 221 | } |
| 222 | |
| 223 | static int reiserfs_for_each_xattr(struct inode *inode, |
| 224 | int (*action)(struct dentry *, void *), |
| 225 | void *data) |
| 226 | { |
| 227 | struct dentry *dir; |
| 228 | int i, err = 0; |
| 229 | loff_t pos = 0; |
| 230 | struct reiserfs_dentry_buf buf = { |
| 231 | .count = 0, |
| 232 | }; |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 233 | |
| 234 | /* Skip out, an xattr has no xattrs associated with it */ |
| 235 | if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1) |
| 236 | return 0; |
| 237 | |
Frederic Weisbecker | 27026a0 | 2009-12-30 05:06:21 +0100 | [diff] [blame] | 238 | reiserfs_write_unlock(inode->i_sb); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 239 | dir = open_xa_dir(inode, XATTR_REPLACE); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 240 | if (IS_ERR(dir)) { |
| 241 | err = PTR_ERR(dir); |
Frederic Weisbecker | 27026a0 | 2009-12-30 05:06:21 +0100 | [diff] [blame] | 242 | reiserfs_write_lock(inode->i_sb); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 243 | goto out; |
| 244 | } else if (!dir->d_inode) { |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 245 | err = 0; |
Frederic Weisbecker | 27026a0 | 2009-12-30 05:06:21 +0100 | [diff] [blame] | 246 | reiserfs_write_lock(inode->i_sb); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 247 | goto out_dir; |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 248 | } |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 249 | |
Frederic Weisbecker | 27026a0 | 2009-12-30 05:06:21 +0100 | [diff] [blame] | 250 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
| 251 | |
| 252 | reiserfs_write_lock(inode->i_sb); |
| 253 | |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 254 | buf.xadir = dir; |
| 255 | err = reiserfs_readdir_dentry(dir, &buf, fill_with_dentries, &pos); |
| 256 | while ((err == 0 || err == -ENOSPC) && buf.count) { |
| 257 | err = 0; |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 258 | |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 259 | for (i = 0; i < buf.count && buf.dentries[i]; i++) { |
| 260 | int lerr = 0; |
| 261 | struct dentry *dentry = buf.dentries[i]; |
| 262 | |
| 263 | if (err == 0 && !S_ISDIR(dentry->d_inode->i_mode)) |
| 264 | lerr = action(dentry, data); |
| 265 | |
| 266 | dput(dentry); |
| 267 | buf.dentries[i] = NULL; |
| 268 | err = lerr ?: err; |
| 269 | } |
| 270 | buf.count = 0; |
| 271 | if (!err) |
| 272 | err = reiserfs_readdir_dentry(dir, &buf, |
| 273 | fill_with_dentries, &pos); |
| 274 | } |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 275 | mutex_unlock(&dir->d_inode->i_mutex); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 276 | |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 277 | /* Clean up after a failed readdir */ |
| 278 | cleanup_dentry_buf(&buf); |
| 279 | |
| 280 | if (!err) { |
| 281 | /* We start a transaction here to avoid a ABBA situation |
| 282 | * between the xattr root's i_mutex and the journal lock. |
| 283 | * This doesn't incur much additional overhead since the |
| 284 | * new transaction will just nest inside the |
| 285 | * outer transaction. */ |
| 286 | int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + |
| 287 | 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); |
| 288 | struct reiserfs_transaction_handle th; |
| 289 | err = journal_begin(&th, inode->i_sb, blocks); |
| 290 | if (!err) { |
| 291 | int jerror; |
| 292 | mutex_lock_nested(&dir->d_parent->d_inode->i_mutex, |
| 293 | I_MUTEX_XATTR); |
| 294 | err = action(dir, data); |
| 295 | jerror = journal_end(&th, inode->i_sb, blocks); |
| 296 | mutex_unlock(&dir->d_parent->d_inode->i_mutex); |
| 297 | err = jerror ?: err; |
| 298 | } |
| 299 | } |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 300 | out_dir: |
| 301 | dput(dir); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 302 | out: |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 303 | /* -ENODATA isn't an error */ |
| 304 | if (err == -ENODATA) |
| 305 | err = 0; |
| 306 | return err; |
| 307 | } |
| 308 | |
| 309 | static int delete_one_xattr(struct dentry *dentry, void *data) |
| 310 | { |
| 311 | struct inode *dir = dentry->d_parent->d_inode; |
| 312 | |
| 313 | /* This is the xattr dir, handle specially. */ |
| 314 | if (S_ISDIR(dentry->d_inode->i_mode)) |
| 315 | return xattr_rmdir(dir, dentry); |
| 316 | |
| 317 | return xattr_unlink(dir, dentry); |
| 318 | } |
| 319 | |
| 320 | static int chown_one_xattr(struct dentry *dentry, void *data) |
| 321 | { |
| 322 | struct iattr *attrs = data; |
| 323 | return reiserfs_setattr(dentry, attrs); |
| 324 | } |
| 325 | |
| 326 | /* No i_mutex, but the inode is unconnected. */ |
| 327 | int reiserfs_delete_xattrs(struct inode *inode) |
| 328 | { |
| 329 | int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); |
| 330 | if (err) |
| 331 | reiserfs_warning(inode->i_sb, "jdm-20004", |
| 332 | "Couldn't delete all xattrs (%d)\n", err); |
| 333 | return err; |
| 334 | } |
| 335 | |
| 336 | /* inode->i_mutex: down */ |
| 337 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
| 338 | { |
| 339 | int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 340 | if (err) |
| 341 | reiserfs_warning(inode->i_sb, "jdm-20007", |
| 342 | "Couldn't chown all xattrs (%d)\n", err); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 343 | return err; |
| 344 | } |
| 345 | |
| 346 | #ifdef CONFIG_REISERFS_FS_XATTR |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | /* Returns a dentry corresponding to a specific extended attribute file |
| 348 | * for the inode. If flags allow, the file is created. Otherwise, a |
| 349 | * valid or negative dentry, or an error is returned. */ |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 350 | static struct dentry *xattr_lookup(struct inode *inode, const char *name, |
| 351 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 353 | struct dentry *xadir, *xafile; |
| 354 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 356 | xadir = open_xa_dir(inode, flags); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 357 | if (IS_ERR(xadir)) |
David Howells | e231c2e | 2008-02-07 00:15:26 -0800 | [diff] [blame] | 358 | return ERR_CAST(xadir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 360 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 361 | xafile = lookup_one_len(name, xadir, strlen(name)); |
| 362 | if (IS_ERR(xafile)) { |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 363 | err = PTR_ERR(xafile); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 364 | goto out; |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 365 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 367 | if (xafile->d_inode && (flags & XATTR_CREATE)) |
| 368 | err = -EEXIST; |
| 369 | |
| 370 | if (!xafile->d_inode) { |
| 371 | err = -ENODATA; |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 372 | if (xattr_may_create(flags)) |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 373 | err = xattr_create(xadir->d_inode, xafile, |
| 374 | 0700|S_IFREG); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 375 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 377 | if (err) |
| 378 | dput(xafile); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 379 | out: |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 380 | mutex_unlock(&xadir->d_inode->i_mutex); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 381 | dput(xadir); |
| 382 | if (err) |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 383 | return ERR_PTR(err); |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 384 | return xafile; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | } |
| 386 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | /* Internal operations on file data */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 388 | static inline void reiserfs_put_page(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 390 | kunmap(page); |
| 391 | page_cache_release(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | } |
| 393 | |
Jeff Mahoney | ec6ea56 | 2009-03-30 14:02:30 -0400 | [diff] [blame] | 394 | static struct page *reiserfs_get_page(struct inode *dir, size_t n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 396 | struct address_space *mapping = dir->i_mapping; |
| 397 | struct page *page; |
| 398 | /* We can deadlock if we try to free dentries, |
| 399 | and an unlink/rmdir has just occured - GFP_NOFS avoids this */ |
Al Viro | c4cdd03 | 2005-10-21 03:22:39 -0400 | [diff] [blame] | 400 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
Jeff Mahoney | ec6ea56 | 2009-03-30 14:02:30 -0400 | [diff] [blame] | 401 | page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 402 | if (!IS_ERR(page)) { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 403 | kmap(page); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 404 | if (PageError(page)) |
| 405 | goto fail; |
| 406 | } |
| 407 | return page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 409 | fail: |
| 410 | reiserfs_put_page(page); |
| 411 | return ERR_PTR(-EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | } |
| 413 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 414 | static inline __u32 xattr_hash(const char *msg, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 416 | return csum_partial(msg, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | } |
| 418 | |
Vladimir Saveliev | ba9d8ce | 2007-10-16 01:25:14 -0700 | [diff] [blame] | 419 | int reiserfs_commit_write(struct file *f, struct page *page, |
| 420 | unsigned from, unsigned to); |
| 421 | int reiserfs_prepare_write(struct file *f, struct page *page, |
| 422 | unsigned from, unsigned to); |
| 423 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 424 | static void update_ctime(struct inode *inode) |
| 425 | { |
| 426 | struct timespec now = current_fs_time(inode->i_sb); |
| 427 | if (hlist_unhashed(&inode->i_hash) || !inode->i_nlink || |
| 428 | timespec_equal(&inode->i_ctime, &now)) |
| 429 | return; |
| 430 | |
| 431 | inode->i_ctime = CURRENT_TIME_SEC; |
| 432 | mark_inode_dirty(inode); |
| 433 | } |
| 434 | |
| 435 | static int lookup_and_delete_xattr(struct inode *inode, const char *name) |
| 436 | { |
| 437 | int err = 0; |
| 438 | struct dentry *dentry, *xadir; |
| 439 | |
| 440 | xadir = open_xa_dir(inode, XATTR_REPLACE); |
| 441 | if (IS_ERR(xadir)) |
| 442 | return PTR_ERR(xadir); |
| 443 | |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 444 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 445 | dentry = lookup_one_len(name, xadir, strlen(name)); |
| 446 | if (IS_ERR(dentry)) { |
| 447 | err = PTR_ERR(dentry); |
| 448 | goto out_dput; |
| 449 | } |
| 450 | |
| 451 | if (dentry->d_inode) { |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 452 | err = xattr_unlink(xadir->d_inode, dentry); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 453 | update_ctime(inode); |
| 454 | } |
| 455 | |
| 456 | dput(dentry); |
| 457 | out_dput: |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 458 | mutex_unlock(&xadir->d_inode->i_mutex); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 459 | dput(xadir); |
| 460 | return err; |
| 461 | } |
| 462 | |
Vladimir Saveliev | ba9d8ce | 2007-10-16 01:25:14 -0700 | [diff] [blame] | 463 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | /* Generic extended attribute operations that can be used by xa plugins */ |
| 465 | |
| 466 | /* |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 467 | * inode->i_mutex: down |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | */ |
| 469 | int |
Jeff Mahoney | 0ab2621 | 2009-03-30 14:02:39 -0400 | [diff] [blame] | 470 | reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, |
| 471 | struct inode *inode, const char *name, |
| 472 | const void *buffer, size_t buffer_size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 474 | int err = 0; |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 475 | struct dentry *dentry; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 476 | struct page *page; |
| 477 | char *data; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 478 | size_t file_pos = 0; |
| 479 | size_t buffer_pos = 0; |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 480 | size_t new_size; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 481 | __u32 xahash = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 483 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
| 484 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 486 | if (!buffer) |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 487 | return lookup_and_delete_xattr(inode, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | |
Frederic Weisbecker | 3f14fea | 2009-12-30 07:03:53 +0100 | [diff] [blame] | 489 | reiserfs_write_unlock(inode->i_sb); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 490 | dentry = xattr_lookup(inode, name, flags); |
Frederic Weisbecker | 3f14fea | 2009-12-30 07:03:53 +0100 | [diff] [blame] | 491 | if (IS_ERR(dentry)) { |
| 492 | reiserfs_write_lock(inode->i_sb); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 493 | return PTR_ERR(dentry); |
Frederic Weisbecker | 3f14fea | 2009-12-30 07:03:53 +0100 | [diff] [blame] | 494 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | |
Frederic Weisbecker | 3f14fea | 2009-12-30 07:03:53 +0100 | [diff] [blame] | 496 | down_read(&REISERFS_I(inode)->i_xattr_sem); |
| 497 | |
| 498 | reiserfs_write_lock(inode->i_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 500 | xahash = xattr_hash(buffer, buffer_size); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 501 | while (buffer_pos < buffer_size || buffer_pos == 0) { |
| 502 | size_t chunk; |
| 503 | size_t skip = 0; |
| 504 | size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1)); |
| 505 | if (buffer_size - buffer_pos > PAGE_CACHE_SIZE) |
| 506 | chunk = PAGE_CACHE_SIZE; |
| 507 | else |
| 508 | chunk = buffer_size - buffer_pos; |
| 509 | |
Jeff Mahoney | ec6ea56 | 2009-03-30 14:02:30 -0400 | [diff] [blame] | 510 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 511 | if (IS_ERR(page)) { |
| 512 | err = PTR_ERR(page); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 513 | goto out_unlock; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 514 | } |
| 515 | |
| 516 | lock_page(page); |
| 517 | data = page_address(page); |
| 518 | |
| 519 | if (file_pos == 0) { |
| 520 | struct reiserfs_xattr_header *rxh; |
| 521 | skip = file_pos = sizeof(struct reiserfs_xattr_header); |
| 522 | if (chunk + skip > PAGE_CACHE_SIZE) |
| 523 | chunk = PAGE_CACHE_SIZE - skip; |
| 524 | rxh = (struct reiserfs_xattr_header *)data; |
| 525 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); |
| 526 | rxh->h_hash = cpu_to_le32(xahash); |
| 527 | } |
| 528 | |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 529 | err = reiserfs_prepare_write(NULL, page, page_offset, |
Vladimir Saveliev | ba9d8ce | 2007-10-16 01:25:14 -0700 | [diff] [blame] | 530 | page_offset + chunk + skip); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 531 | if (!err) { |
| 532 | if (buffer) |
| 533 | memcpy(data + skip, buffer + buffer_pos, chunk); |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 534 | err = reiserfs_commit_write(NULL, page, page_offset, |
| 535 | page_offset + chunk + |
| 536 | skip); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 537 | } |
| 538 | unlock_page(page); |
| 539 | reiserfs_put_page(page); |
| 540 | buffer_pos += chunk; |
| 541 | file_pos += chunk; |
| 542 | skip = 0; |
| 543 | if (err || buffer_size == 0 || !buffer) |
| 544 | break; |
| 545 | } |
| 546 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 547 | new_size = buffer_size + sizeof(struct reiserfs_xattr_header); |
| 548 | if (!err && new_size < i_size_read(dentry->d_inode)) { |
| 549 | struct iattr newattrs = { |
| 550 | .ia_ctime = current_fs_time(inode->i_sb), |
| 551 | .ia_size = buffer_size, |
| 552 | .ia_valid = ATTR_SIZE | ATTR_CTIME, |
| 553 | }; |
| 554 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR); |
| 555 | down_write(&dentry->d_inode->i_alloc_sem); |
| 556 | err = reiserfs_setattr(dentry, &newattrs); |
| 557 | up_write(&dentry->d_inode->i_alloc_sem); |
| 558 | mutex_unlock(&dentry->d_inode->i_mutex); |
| 559 | } else |
| 560 | update_ctime(inode); |
| 561 | out_unlock: |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 562 | up_write(&REISERFS_I(inode)->i_xattr_sem); |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 563 | dput(dentry); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 564 | return err; |
| 565 | } |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 566 | |
Jeff Mahoney | 0ab2621 | 2009-03-30 14:02:39 -0400 | [diff] [blame] | 567 | /* We need to start a transaction to maintain lock ordering */ |
| 568 | int reiserfs_xattr_set(struct inode *inode, const char *name, |
| 569 | const void *buffer, size_t buffer_size, int flags) |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 570 | { |
Jeff Mahoney | 0ab2621 | 2009-03-30 14:02:39 -0400 | [diff] [blame] | 571 | |
| 572 | struct reiserfs_transaction_handle th; |
| 573 | int error, error2; |
| 574 | size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size); |
| 575 | |
| 576 | if (!(flags & XATTR_REPLACE)) |
| 577 | jbegin_count += reiserfs_xattr_jcreate_nblocks(inode); |
| 578 | |
| 579 | reiserfs_write_lock(inode->i_sb); |
| 580 | error = journal_begin(&th, inode->i_sb, jbegin_count); |
| 581 | if (error) { |
| 582 | reiserfs_write_unlock(inode->i_sb); |
| 583 | return error; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 584 | } |
| 585 | |
Jeff Mahoney | 0ab2621 | 2009-03-30 14:02:39 -0400 | [diff] [blame] | 586 | error = reiserfs_xattr_set_handle(&th, inode, name, |
| 587 | buffer, buffer_size, flags); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 588 | |
Jeff Mahoney | 0ab2621 | 2009-03-30 14:02:39 -0400 | [diff] [blame] | 589 | error2 = journal_end(&th, inode->i_sb, jbegin_count); |
| 590 | if (error == 0) |
| 591 | error = error2; |
| 592 | reiserfs_write_unlock(inode->i_sb); |
| 593 | |
| 594 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | } |
| 596 | |
| 597 | /* |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 598 | * inode->i_mutex: down |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | */ |
| 600 | int |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 601 | reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 602 | size_t buffer_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 604 | ssize_t err = 0; |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 605 | struct dentry *dentry; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 606 | size_t isize; |
| 607 | size_t file_pos = 0; |
| 608 | size_t buffer_pos = 0; |
| 609 | struct page *page; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 610 | __u32 hash = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 612 | if (name == NULL) |
| 613 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 615 | /* We can't have xattrs attached to v1 items since they don't have |
| 616 | * generation numbers */ |
| 617 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
| 618 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 620 | dentry = xattr_lookup(inode, name, XATTR_REPLACE); |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 621 | if (IS_ERR(dentry)) { |
| 622 | err = PTR_ERR(dentry); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 623 | goto out; |
| 624 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 626 | down_read(&REISERFS_I(inode)->i_xattr_sem); |
Jeff Mahoney | d984561 | 2009-03-30 14:02:35 -0400 | [diff] [blame] | 627 | |
Jeff Mahoney | f437c52 | 2009-03-30 14:02:29 -0400 | [diff] [blame] | 628 | isize = i_size_read(dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 630 | /* Just return the size needed */ |
| 631 | if (buffer == NULL) { |
| 632 | err = isize - sizeof(struct reiserfs_xattr_header); |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 633 | goto out_unlock; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 634 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 636 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { |
| 637 | err = -ERANGE; |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 638 | goto out_unlock; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 639 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 641 | while (file_pos < isize) { |
| 642 | size_t chunk; |
| 643 | char *data; |
| 644 | size_t skip = 0; |
| 645 | if (isize - file_pos > PAGE_CACHE_SIZE) |
| 646 | chunk = PAGE_CACHE_SIZE; |
| 647 | else |
| 648 | chunk = isize - file_pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | |
Jeff Mahoney | ec6ea56 | 2009-03-30 14:02:30 -0400 | [diff] [blame] | 650 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 651 | if (IS_ERR(page)) { |
| 652 | err = PTR_ERR(page); |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 653 | goto out_unlock; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 654 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 656 | lock_page(page); |
| 657 | data = page_address(page); |
| 658 | if (file_pos == 0) { |
| 659 | struct reiserfs_xattr_header *rxh = |
| 660 | (struct reiserfs_xattr_header *)data; |
| 661 | skip = file_pos = sizeof(struct reiserfs_xattr_header); |
| 662 | chunk -= skip; |
| 663 | /* Magic doesn't match up.. */ |
| 664 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { |
| 665 | unlock_page(page); |
| 666 | reiserfs_put_page(page); |
Jeff Mahoney | 45b03d5 | 2009-03-30 14:02:21 -0400 | [diff] [blame] | 667 | reiserfs_warning(inode->i_sb, "jdm-20001", |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 668 | "Invalid magic for xattr (%s) " |
| 669 | "associated with %k", name, |
| 670 | INODE_PKEY(inode)); |
| 671 | err = -EIO; |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 672 | goto out_unlock; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 673 | } |
| 674 | hash = le32_to_cpu(rxh->h_hash); |
| 675 | } |
| 676 | memcpy(buffer + buffer_pos, data + skip, chunk); |
| 677 | unlock_page(page); |
| 678 | reiserfs_put_page(page); |
| 679 | file_pos += chunk; |
| 680 | buffer_pos += chunk; |
| 681 | skip = 0; |
| 682 | } |
| 683 | err = isize - sizeof(struct reiserfs_xattr_header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 685 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != |
| 686 | hash) { |
Jeff Mahoney | 45b03d5 | 2009-03-30 14:02:21 -0400 | [diff] [blame] | 687 | reiserfs_warning(inode->i_sb, "jdm-20002", |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 688 | "Invalid hash for xattr (%s) associated " |
| 689 | "with %k", name, INODE_PKEY(inode)); |
| 690 | err = -EIO; |
| 691 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 693 | out_unlock: |
| 694 | up_read(&REISERFS_I(inode)->i_xattr_sem); |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 695 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 697 | out: |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 698 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | } |
| 700 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 701 | /* |
| 702 | * In order to implement different sets of xattr operations for each xattr |
| 703 | * prefix with the generic xattr API, a filesystem should create a |
| 704 | * null-terminated array of struct xattr_handler (one for each prefix) and |
| 705 | * hang a pointer to it off of the s_xattr field of the superblock. |
| 706 | * |
| 707 | * The generic_fooxattr() functions will use this list to dispatch xattr |
| 708 | * operations to the correct xattr_handler. |
| 709 | */ |
| 710 | #define for_each_xattr_handler(handlers, handler) \ |
| 711 | for ((handler) = *(handlers)++; \ |
| 712 | (handler) != NULL; \ |
| 713 | (handler) = *(handlers)++) |
| 714 | |
| 715 | /* This is the implementation for the xattr plugin infrastructure */ |
| 716 | static inline struct xattr_handler * |
| 717 | find_xattr_handler_prefix(struct xattr_handler **handlers, |
| 718 | const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | { |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 720 | struct xattr_handler *xah; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 722 | if (!handlers) |
| 723 | return NULL; |
| 724 | |
| 725 | for_each_xattr_handler(handlers, xah) { |
| 726 | if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0) |
| 727 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | } |
| 729 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 730 | return xah; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | } |
| 732 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | |
| 734 | /* |
| 735 | * Inode operation getxattr() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | */ |
| 737 | ssize_t |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 738 | reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, |
| 739 | size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | { |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 741 | struct inode *inode = dentry->d_inode; |
| 742 | struct xattr_handler *handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 744 | handler = find_xattr_handler_prefix(inode->i_sb->s_xattr, name); |
| 745 | |
| 746 | if (!handler || get_inode_sd_version(inode) == STAT_DATA_V1) |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 747 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 749 | return handler->get(inode, name, buffer, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | } |
| 751 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | /* |
| 753 | * Inode operation setxattr() |
| 754 | * |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 755 | * dentry->d_inode->i_mutex down |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | */ |
| 757 | int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 758 | reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
| 759 | size_t size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | { |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 761 | struct inode *inode = dentry->d_inode; |
| 762 | struct xattr_handler *handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 764 | handler = find_xattr_handler_prefix(inode->i_sb->s_xattr, name); |
| 765 | |
| 766 | if (!handler || get_inode_sd_version(inode) == STAT_DATA_V1) |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 767 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 769 | return handler->set(inode, name, value, size, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | } |
| 771 | |
| 772 | /* |
| 773 | * Inode operation removexattr() |
| 774 | * |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 775 | * dentry->d_inode->i_mutex down |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 777 | int reiserfs_removexattr(struct dentry *dentry, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | { |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 779 | struct inode *inode = dentry->d_inode; |
| 780 | struct xattr_handler *handler; |
| 781 | handler = find_xattr_handler_prefix(inode->i_sb->s_xattr, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 783 | if (!handler || get_inode_sd_version(inode) == STAT_DATA_V1) |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 784 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 786 | return handler->set(inode, name, NULL, 0, XATTR_REPLACE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | } |
| 788 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 789 | struct listxattr_buf { |
| 790 | size_t size; |
| 791 | size_t pos; |
| 792 | char *buf; |
| 793 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | }; |
| 795 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 796 | static int listxattr_filler(void *buf, const char *name, int namelen, |
| 797 | loff_t offset, u64 ino, unsigned int d_type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | { |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 799 | struct listxattr_buf *b = (struct listxattr_buf *)buf; |
| 800 | size_t size; |
| 801 | if (name[0] != '.' || |
| 802 | (namelen != 1 && (name[1] != '.' || namelen != 2))) { |
| 803 | struct xattr_handler *handler; |
| 804 | handler = find_xattr_handler_prefix(b->inode->i_sb->s_xattr, |
| 805 | name); |
| 806 | if (!handler) /* Unsupported xattr name */ |
| 807 | return 0; |
| 808 | if (b->buf) { |
| 809 | size = handler->list(b->inode, b->buf + b->pos, |
| 810 | b->size, name, namelen); |
| 811 | if (size > b->size) |
| 812 | return -ERANGE; |
| 813 | } else { |
| 814 | size = handler->list(b->inode, NULL, 0, name, namelen); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 815 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 817 | b->pos += size; |
| 818 | } |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 819 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | } |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 821 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | /* |
| 823 | * Inode operation listxattr() |
| 824 | * |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 825 | * We totally ignore the generic listxattr here because it would be stupid |
| 826 | * not to. Since the xattrs are organized in a directory, we can just |
| 827 | * readdir to find them. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 829 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 831 | struct dentry *dir; |
| 832 | int err = 0; |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 833 | loff_t pos = 0; |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 834 | struct listxattr_buf buf = { |
| 835 | .inode = dentry->d_inode, |
| 836 | .buf = buffer, |
| 837 | .size = buffer ? size : 0, |
| 838 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 840 | if (!dentry->d_inode) |
| 841 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | |
Jeff Mahoney | 677c9b2 | 2009-05-05 15:30:17 -0400 | [diff] [blame] | 843 | if (!dentry->d_sb->s_xattr || |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 844 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
| 845 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 847 | dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 848 | if (IS_ERR(dir)) { |
| 849 | err = PTR_ERR(dir); |
| 850 | if (err == -ENODATA) |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 851 | err = 0; /* Not an error if there aren't any xattrs */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 852 | goto out; |
| 853 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 855 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 856 | err = reiserfs_readdir_dentry(dir, &buf, listxattr_filler, &pos); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 857 | mutex_unlock(&dir->d_inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 859 | if (!err) |
| 860 | err = buf.pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 862 | dput(dir); |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 863 | out: |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 864 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | } |
| 866 | |
Christoph Hellwig | ec19157 | 2006-02-01 03:06:46 -0800 | [diff] [blame] | 867 | static int reiserfs_check_acl(struct inode *inode, int mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | { |
Christoph Hellwig | ec19157 | 2006-02-01 03:06:46 -0800 | [diff] [blame] | 869 | struct posix_acl *acl; |
| 870 | int error = -EAGAIN; /* do regular unix permission checks by default */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 871 | |
Christoph Hellwig | ec19157 | 2006-02-01 03:06:46 -0800 | [diff] [blame] | 872 | acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS); |
| 873 | |
Christoph Hellwig | ec19157 | 2006-02-01 03:06:46 -0800 | [diff] [blame] | 874 | if (acl) { |
| 875 | if (!IS_ERR(acl)) { |
| 876 | error = posix_acl_permission(inode, acl, mask); |
| 877 | posix_acl_release(acl); |
| 878 | } else if (PTR_ERR(acl) != -ENODATA) |
| 879 | error = PTR_ERR(acl); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 880 | } |
| 881 | |
Christoph Hellwig | ec19157 | 2006-02-01 03:06:46 -0800 | [diff] [blame] | 882 | return error; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 883 | } |
| 884 | |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 885 | static int create_privroot(struct dentry *dentry) |
| 886 | { |
| 887 | int err; |
| 888 | struct inode *inode = dentry->d_parent->d_inode; |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 889 | WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex)); |
| 890 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 891 | err = xattr_mkdir(inode, dentry, 0700); |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 892 | if (err || !dentry->d_inode) { |
| 893 | reiserfs_warning(dentry->d_sb, "jdm-20006", |
| 894 | "xattrs/ACLs enabled and couldn't " |
| 895 | "find/create .reiserfs_priv. " |
| 896 | "Failing mount."); |
| 897 | return -EOPNOTSUPP; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 898 | } |
| 899 | |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 900 | dentry->d_inode->i_flags |= S_PRIVATE; |
| 901 | reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr " |
| 902 | "storage.\n", PRIVROOT_NAME); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 903 | |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 904 | return 0; |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 905 | } |
| 906 | |
Jeff Mahoney | 12abb35 | 2009-05-17 01:02:01 -0400 | [diff] [blame] | 907 | #else |
| 908 | int __init reiserfs_xattr_register_handlers(void) { return 0; } |
| 909 | void reiserfs_xattr_unregister_handlers(void) {} |
| 910 | static int create_privroot(struct dentry *dentry) { return 0; } |
| 911 | #endif |
| 912 | |
| 913 | /* Actual operations that are exported to VFS-land */ |
| 914 | struct xattr_handler *reiserfs_xattr_handlers[] = { |
| 915 | #ifdef CONFIG_REISERFS_FS_XATTR |
| 916 | &reiserfs_xattr_user_handler, |
| 917 | &reiserfs_xattr_trusted_handler, |
| 918 | #endif |
| 919 | #ifdef CONFIG_REISERFS_FS_SECURITY |
| 920 | &reiserfs_xattr_security_handler, |
| 921 | #endif |
| 922 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL |
| 923 | &reiserfs_posix_acl_access_handler, |
| 924 | &reiserfs_posix_acl_default_handler, |
| 925 | #endif |
| 926 | NULL |
| 927 | }; |
| 928 | |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 929 | static int xattr_mount_check(struct super_block *s) |
| 930 | { |
| 931 | /* We need generation numbers to ensure that the oid mapping is correct |
| 932 | * v3.5 filesystems don't have them. */ |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 933 | if (old_format_only(s)) { |
| 934 | if (reiserfs_xattrs_optional(s)) { |
| 935 | /* Old format filesystem, but optional xattrs have |
| 936 | * been enabled. Error out. */ |
| 937 | reiserfs_warning(s, "jdm-2005", |
| 938 | "xattrs/ACLs not supported " |
| 939 | "on pre-v3.6 format filesystems. " |
| 940 | "Failing mount."); |
| 941 | return -EOPNOTSUPP; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 942 | } |
| 943 | } |
| 944 | |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 945 | return 0; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 946 | } |
| 947 | |
Jeff Mahoney | b83674c | 2009-05-17 01:02:03 -0400 | [diff] [blame] | 948 | int reiserfs_permission(struct inode *inode, int mask) |
| 949 | { |
| 950 | /* |
| 951 | * We don't do permission checks on the internal objects. |
| 952 | * Permissions are determined by the "owning" object. |
| 953 | */ |
| 954 | if (IS_PRIVATE(inode)) |
| 955 | return 0; |
| 956 | |
| 957 | #ifdef CONFIG_REISERFS_FS_XATTR |
| 958 | /* |
| 959 | * Stat data v1 doesn't support ACLs. |
| 960 | */ |
| 961 | if (get_inode_sd_version(inode) != STAT_DATA_V1) |
| 962 | return generic_permission(inode, mask, reiserfs_check_acl); |
| 963 | #endif |
| 964 | return generic_permission(inode, mask, NULL); |
| 965 | } |
| 966 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | /* This will catch lookups from the fs root to .reiserfs_priv */ |
| 968 | static int |
| 969 | xattr_lookup_poison(struct dentry *dentry, struct qstr *q1, struct qstr *name) |
| 970 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 971 | struct dentry *priv_root = REISERFS_SB(dentry->d_sb)->priv_root; |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 972 | if (container_of(q1, struct dentry, d_name) == priv_root) |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 973 | return -ENOENT; |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 974 | if (q1->len == name->len && |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 975 | !memcmp(q1->name, name->name, name->len)) |
| 976 | return 0; |
| 977 | return 1; |
| 978 | } |
| 979 | |
Al Viro | e16404e | 2009-02-20 05:55:13 +0000 | [diff] [blame] | 980 | static const struct dentry_operations xattr_lookup_poison_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | .d_compare = xattr_lookup_poison, |
| 982 | }; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 983 | |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 984 | int reiserfs_lookup_privroot(struct super_block *s) |
| 985 | { |
| 986 | struct dentry *dentry; |
| 987 | int err = 0; |
| 988 | |
| 989 | /* If we don't have the privroot located yet - go find it */ |
Frederic Weisbecker | c72e057 | 2009-05-16 18:12:08 +0200 | [diff] [blame] | 990 | reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s); |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 991 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, |
| 992 | strlen(PRIVROOT_NAME)); |
| 993 | if (!IS_ERR(dentry)) { |
| 994 | REISERFS_SB(s)->priv_root = dentry; |
Jeff Mahoney | 7342281 | 2009-05-10 16:05:39 -0400 | [diff] [blame] | 995 | if (!reiserfs_expose_privroot(s)) |
| 996 | s->s_root->d_op = &xattr_lookup_poison_ops; |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 997 | if (dentry->d_inode) |
| 998 | dentry->d_inode->i_flags |= S_PRIVATE; |
| 999 | } else |
| 1000 | err = PTR_ERR(dentry); |
| 1001 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
| 1002 | |
| 1003 | return err; |
| 1004 | } |
| 1005 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | /* We need to take a copy of the mount flags since things like |
| 1007 | * MS_RDONLY don't get set until *after* we're called. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | * mount_flags != mount_options */ |
| 1009 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
| 1010 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1011 | int err = 0; |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 1012 | struct dentry *privroot = REISERFS_SB(s)->priv_root; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 1014 | err = xattr_mount_check(s); |
| 1015 | if (err) |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1016 | goto error; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1017 | |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 1018 | if (!privroot->d_inode && !(mount_flags & MS_RDONLY)) { |
Frederic Weisbecker | ae635c0 | 2009-08-25 02:24:45 +0200 | [diff] [blame] | 1019 | reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s); |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 1020 | err = create_privroot(REISERFS_SB(s)->priv_root); |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 1021 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1022 | } |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 1023 | |
| 1024 | if (privroot->d_inode) { |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 1025 | s->s_xattr = reiserfs_xattr_handlers; |
Frederic Weisbecker | c72e057 | 2009-05-16 18:12:08 +0200 | [diff] [blame] | 1026 | reiserfs_mutex_lock_safe(&privroot->d_inode->i_mutex, s); |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 1027 | if (!REISERFS_SB(s)->xattr_root) { |
| 1028 | struct dentry *dentry; |
| 1029 | dentry = lookup_one_len(XAROOT_NAME, privroot, |
| 1030 | strlen(XAROOT_NAME)); |
| 1031 | if (!IS_ERR(dentry)) |
| 1032 | REISERFS_SB(s)->xattr_root = dentry; |
| 1033 | else |
| 1034 | err = PTR_ERR(dentry); |
| 1035 | } |
| 1036 | mutex_unlock(&privroot->d_inode->i_mutex); |
| 1037 | } |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 1038 | |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 1039 | error: |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1040 | if (err) { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1041 | clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt)); |
| 1042 | clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt)); |
| 1043 | } |
| 1044 | |
| 1045 | /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1046 | if (reiserfs_posixacl(s)) |
| 1047 | s->s_flags |= MS_POSIXACL; |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 1048 | else |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 1049 | s->s_flags &= ~MS_POSIXACL; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1050 | |
| 1051 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | } |