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 | |
Al Viro | f466c6f | 2012-03-17 01:16:43 -0400 | [diff] [blame] | 36 | #include "reiserfs.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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 41 | #include <linux/gfp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #include <linux/fs.h> |
| 43 | #include <linux/file.h> |
| 44 | #include <linux/pagemap.h> |
| 45 | #include <linux/xattr.h> |
Al Viro | c45ac88 | 2012-03-17 00:59:06 -0400 | [diff] [blame] | 46 | #include "xattr.h" |
Al Viro | a3063ab | 2012-03-17 01:03:10 -0400 | [diff] [blame] | 47 | #include "acl.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | #include <asm/uaccess.h> |
Al Viro | 3277c39 | 2006-11-14 21:13:53 -0800 | [diff] [blame] | 49 | #include <net/checksum.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #include <linux/stat.h> |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 51 | #include <linux/quotaops.h> |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 52 | #include <linux/security.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #define PRIVROOT_NAME ".reiserfs_priv" |
| 55 | #define XAROOT_NAME "xattrs" |
| 56 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 58 | /* Helpers for inode ops. We do this so that we don't have all the VFS |
| 59 | * overhead and also for proper i_mutex annotation. |
| 60 | * dir->i_mutex must be held for all of them. */ |
Jeff Mahoney | 3a355cc | 2009-03-30 16:49:58 -0400 | [diff] [blame] | 61 | #ifdef CONFIG_REISERFS_FS_XATTR |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 62 | static int xattr_create(struct inode *dir, struct dentry *dentry, int mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | { |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 64 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
Al Viro | ebfc3b4 | 2012-06-10 18:05:36 -0400 | [diff] [blame] | 65 | return dir->i_op->create(dir, dentry, mode, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | } |
Jeff Mahoney | 3a355cc | 2009-03-30 16:49:58 -0400 | [diff] [blame] | 67 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 69 | static int xattr_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 70 | { |
| 71 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
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)); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 83 | |
Jeff Mahoney | 4c05141 | 2013-08-08 17:27:19 -0400 | [diff] [blame] | 84 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 85 | error = dir->i_op->unlink(dir, dentry); |
| 86 | mutex_unlock(&dentry->d_inode->i_mutex); |
| 87 | |
| 88 | if (!error) |
| 89 | d_delete(dentry); |
| 90 | return error; |
| 91 | } |
| 92 | |
| 93 | static int xattr_rmdir(struct inode *dir, struct dentry *dentry) |
| 94 | { |
| 95 | int error; |
| 96 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 97 | |
Jeff Mahoney | 4c05141 | 2013-08-08 17:27:19 -0400 | [diff] [blame] | 98 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 99 | error = dir->i_op->rmdir(dir, dentry); |
| 100 | if (!error) |
| 101 | dentry->d_inode->i_flags |= S_DEAD; |
| 102 | mutex_unlock(&dentry->d_inode->i_mutex); |
| 103 | if (!error) |
| 104 | d_delete(dentry); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 105 | |
| 106 | return error; |
| 107 | } |
| 108 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 109 | #define xattr_may_create(flags) (!flags || flags & XATTR_CREATE) |
| 110 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 111 | static struct dentry *open_xa_root(struct super_block *sb, int flags) |
| 112 | { |
| 113 | struct dentry *privroot = REISERFS_SB(sb)->priv_root; |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 114 | struct dentry *xaroot; |
| 115 | if (!privroot->d_inode) |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 116 | return ERR_PTR(-ENODATA); |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 117 | |
| 118 | mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR); |
| 119 | |
| 120 | xaroot = dget(REISERFS_SB(sb)->xattr_root); |
Jeff Mahoney | ceb5edc | 2009-05-17 01:02:02 -0400 | [diff] [blame] | 121 | if (!xaroot) |
| 122 | xaroot = ERR_PTR(-ENODATA); |
| 123 | else if (!xaroot->d_inode) { |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 124 | int err = -ENODATA; |
| 125 | if (xattr_may_create(flags)) |
| 126 | err = xattr_mkdir(privroot->d_inode, xaroot, 0700); |
| 127 | if (err) { |
| 128 | dput(xaroot); |
| 129 | xaroot = ERR_PTR(err); |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | mutex_unlock(&privroot->d_inode->i_mutex); |
| 134 | return xaroot; |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 135 | } |
| 136 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 137 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 139 | struct dentry *xaroot, *xadir; |
| 140 | char namebuf[17]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 142 | xaroot = open_xa_root(inode->i_sb, flags); |
Jeff Mahoney | 9b7f375 | 2007-04-23 14:41:17 -0700 | [diff] [blame] | 143 | if (IS_ERR(xaroot)) |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 144 | return xaroot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 146 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
| 147 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), |
| 148 | inode->i_generation); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 150 | mutex_lock_nested(&xaroot->d_inode->i_mutex, I_MUTEX_XATTR); |
| 151 | |
| 152 | xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf)); |
| 153 | if (!IS_ERR(xadir) && !xadir->d_inode) { |
| 154 | int err = -ENODATA; |
| 155 | if (xattr_may_create(flags)) |
| 156 | err = xattr_mkdir(xaroot->d_inode, xadir, 0700); |
| 157 | if (err) { |
| 158 | dput(xadir); |
| 159 | xadir = ERR_PTR(err); |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | mutex_unlock(&xaroot->d_inode->i_mutex); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 164 | dput(xaroot); |
| 165 | return xadir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | } |
| 167 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 168 | /* The following are side effects of other operations that aren't explicitly |
| 169 | * modifying extended attributes. This includes operations such as permissions |
| 170 | * or ownership changes, object deletions, etc. */ |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 171 | struct reiserfs_dentry_buf { |
Al Viro | 4acf381 | 2013-05-17 22:42:17 -0400 | [diff] [blame] | 172 | struct dir_context ctx; |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 173 | struct dentry *xadir; |
| 174 | int count; |
| 175 | struct dentry *dentries[8]; |
| 176 | }; |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 177 | |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 178 | static int |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 179 | fill_with_dentries(void *buf, const char *name, int namelen, loff_t offset, |
| 180 | u64 ino, unsigned int d_type) |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 181 | { |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 182 | struct reiserfs_dentry_buf *dbuf = buf; |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 183 | struct dentry *dentry; |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 184 | WARN_ON_ONCE(!mutex_is_locked(&dbuf->xadir->d_inode->i_mutex)); |
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 | if (dbuf->count == ARRAY_SIZE(dbuf->dentries)) |
| 187 | return -ENOSPC; |
| 188 | |
Jan Kara | 35e5cbc | 2013-03-29 15:39:16 +0100 | [diff] [blame] | 189 | if (name[0] == '.' && (namelen < 2 || |
| 190 | (namelen == 2 && name[1] == '.'))) |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 191 | return 0; |
| 192 | |
| 193 | dentry = lookup_one_len(name, dbuf->xadir, namelen); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 194 | if (IS_ERR(dentry)) { |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 195 | return PTR_ERR(dentry); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 196 | } else if (!dentry->d_inode) { |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 197 | /* A directory entry exists, but no file? */ |
| 198 | reiserfs_error(dentry->d_sb, "xattr-20003", |
| 199 | "Corrupted directory: xattr %s listed but " |
| 200 | "not found for file %s.\n", |
| 201 | dentry->d_name.name, dbuf->xadir->d_name.name); |
| 202 | dput(dentry); |
| 203 | return -EIO; |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 204 | } |
| 205 | |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 206 | dbuf->dentries[dbuf->count++] = dentry; |
| 207 | return 0; |
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 | static void |
| 211 | cleanup_dentry_buf(struct reiserfs_dentry_buf *buf) |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 212 | { |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 213 | int i; |
| 214 | for (i = 0; i < buf->count; i++) |
| 215 | if (buf->dentries[i]) |
| 216 | dput(buf->dentries[i]); |
| 217 | } |
| 218 | |
| 219 | static int reiserfs_for_each_xattr(struct inode *inode, |
| 220 | int (*action)(struct dentry *, void *), |
| 221 | void *data) |
| 222 | { |
| 223 | struct dentry *dir; |
| 224 | int i, err = 0; |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 225 | struct reiserfs_dentry_buf buf = { |
Al Viro | 4acf381 | 2013-05-17 22:42:17 -0400 | [diff] [blame] | 226 | .ctx.actor = fill_with_dentries, |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 227 | }; |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 228 | |
| 229 | /* Skip out, an xattr has no xattrs associated with it */ |
| 230 | if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1) |
| 231 | return 0; |
| 232 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 233 | dir = open_xa_dir(inode, XATTR_REPLACE); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 234 | if (IS_ERR(dir)) { |
| 235 | err = PTR_ERR(dir); |
| 236 | goto out; |
| 237 | } else if (!dir->d_inode) { |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 238 | err = 0; |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 239 | goto out_dir; |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 240 | } |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 241 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 242 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
Frederic Weisbecker | 27026a0 | 2009-12-30 05:06:21 +0100 | [diff] [blame] | 243 | |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 244 | buf.xadir = dir; |
Al Viro | cd62cda | 2013-05-17 22:58:58 -0400 | [diff] [blame] | 245 | while (1) { |
| 246 | err = reiserfs_readdir_inode(dir->d_inode, &buf.ctx); |
| 247 | if (err) |
| 248 | break; |
| 249 | if (!buf.count) |
| 250 | break; |
| 251 | for (i = 0; !err && i < buf.count && buf.dentries[i]; i++) { |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 252 | struct dentry *dentry = buf.dentries[i]; |
| 253 | |
Al Viro | cd62cda | 2013-05-17 22:58:58 -0400 | [diff] [blame] | 254 | if (!S_ISDIR(dentry->d_inode->i_mode)) |
| 255 | err = action(dentry, data); |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 256 | |
| 257 | dput(dentry); |
| 258 | buf.dentries[i] = NULL; |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 259 | } |
Al Viro | cd62cda | 2013-05-17 22:58:58 -0400 | [diff] [blame] | 260 | if (err) |
| 261 | break; |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 262 | buf.count = 0; |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 263 | } |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 264 | mutex_unlock(&dir->d_inode->i_mutex); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 265 | |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 266 | cleanup_dentry_buf(&buf); |
| 267 | |
| 268 | if (!err) { |
| 269 | /* We start a transaction here to avoid a ABBA situation |
| 270 | * between the xattr root's i_mutex and the journal lock. |
| 271 | * This doesn't incur much additional overhead since the |
| 272 | * new transaction will just nest inside the |
| 273 | * outer transaction. */ |
| 274 | int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + |
| 275 | 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); |
| 276 | struct reiserfs_transaction_handle th; |
Jeff Mahoney | 4c05141 | 2013-08-08 17:27:19 -0400 | [diff] [blame] | 277 | reiserfs_write_lock(inode->i_sb); |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 278 | err = journal_begin(&th, inode->i_sb, blocks); |
Jeff Mahoney | 4c05141 | 2013-08-08 17:27:19 -0400 | [diff] [blame] | 279 | reiserfs_write_unlock(inode->i_sb); |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 280 | if (!err) { |
| 281 | int jerror; |
Jeff Mahoney | 4c05141 | 2013-08-08 17:27:19 -0400 | [diff] [blame] | 282 | mutex_lock_nested(&dir->d_parent->d_inode->i_mutex, |
| 283 | I_MUTEX_XATTR); |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 284 | err = action(dir, data); |
Jeff Mahoney | 4c05141 | 2013-08-08 17:27:19 -0400 | [diff] [blame] | 285 | reiserfs_write_lock(inode->i_sb); |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 286 | jerror = journal_end(&th, inode->i_sb, blocks); |
Jeff Mahoney | 4c05141 | 2013-08-08 17:27:19 -0400 | [diff] [blame] | 287 | reiserfs_write_unlock(inode->i_sb); |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 288 | mutex_unlock(&dir->d_parent->d_inode->i_mutex); |
| 289 | err = jerror ?: err; |
| 290 | } |
| 291 | } |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 292 | out_dir: |
| 293 | dput(dir); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 294 | out: |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 295 | /* -ENODATA isn't an error */ |
| 296 | if (err == -ENODATA) |
| 297 | err = 0; |
| 298 | return err; |
| 299 | } |
| 300 | |
| 301 | static int delete_one_xattr(struct dentry *dentry, void *data) |
| 302 | { |
| 303 | struct inode *dir = dentry->d_parent->d_inode; |
| 304 | |
| 305 | /* This is the xattr dir, handle specially. */ |
| 306 | if (S_ISDIR(dentry->d_inode->i_mode)) |
| 307 | return xattr_rmdir(dir, dentry); |
| 308 | |
| 309 | return xattr_unlink(dir, dentry); |
| 310 | } |
| 311 | |
| 312 | static int chown_one_xattr(struct dentry *dentry, void *data) |
| 313 | { |
| 314 | struct iattr *attrs = data; |
Jeff Mahoney | 4a85701 | 2013-05-31 15:54:17 -0400 | [diff] [blame] | 315 | int ia_valid = attrs->ia_valid; |
| 316 | int err; |
| 317 | |
| 318 | /* |
| 319 | * We only want the ownership bits. Otherwise, we'll do |
| 320 | * things like change a directory to a regular file if |
| 321 | * ATTR_MODE is set. |
| 322 | */ |
| 323 | attrs->ia_valid &= (ATTR_UID|ATTR_GID); |
| 324 | err = reiserfs_setattr(dentry, attrs); |
| 325 | attrs->ia_valid = ia_valid; |
| 326 | |
| 327 | return err; |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 328 | } |
| 329 | |
| 330 | /* No i_mutex, but the inode is unconnected. */ |
| 331 | int reiserfs_delete_xattrs(struct inode *inode) |
| 332 | { |
| 333 | int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); |
| 334 | if (err) |
| 335 | reiserfs_warning(inode->i_sb, "jdm-20004", |
| 336 | "Couldn't delete all xattrs (%d)\n", err); |
| 337 | return err; |
| 338 | } |
| 339 | |
| 340 | /* inode->i_mutex: down */ |
| 341 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
| 342 | { |
| 343 | int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 344 | if (err) |
| 345 | reiserfs_warning(inode->i_sb, "jdm-20007", |
| 346 | "Couldn't chown all xattrs (%d)\n", err); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 347 | return err; |
| 348 | } |
| 349 | |
| 350 | #ifdef CONFIG_REISERFS_FS_XATTR |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | /* Returns a dentry corresponding to a specific extended attribute file |
| 352 | * for the inode. If flags allow, the file is created. Otherwise, a |
| 353 | * valid or negative dentry, or an error is returned. */ |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 354 | static struct dentry *xattr_lookup(struct inode *inode, const char *name, |
| 355 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 357 | struct dentry *xadir, *xafile; |
| 358 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 360 | xadir = open_xa_dir(inode, flags); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 361 | if (IS_ERR(xadir)) |
David Howells | e231c2e | 2008-02-07 00:15:26 -0800 | [diff] [blame] | 362 | return ERR_CAST(xadir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 364 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 365 | xafile = lookup_one_len(name, xadir, strlen(name)); |
| 366 | if (IS_ERR(xafile)) { |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 367 | err = PTR_ERR(xafile); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 368 | goto out; |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 369 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 371 | if (xafile->d_inode && (flags & XATTR_CREATE)) |
| 372 | err = -EEXIST; |
| 373 | |
| 374 | if (!xafile->d_inode) { |
| 375 | err = -ENODATA; |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 376 | if (xattr_may_create(flags)) |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 377 | err = xattr_create(xadir->d_inode, xafile, |
| 378 | 0700|S_IFREG); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 379 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 381 | if (err) |
| 382 | dput(xafile); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 383 | out: |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 384 | mutex_unlock(&xadir->d_inode->i_mutex); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 385 | dput(xadir); |
| 386 | if (err) |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 387 | return ERR_PTR(err); |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 388 | return xafile; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | } |
| 390 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | /* Internal operations on file data */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 392 | static inline void reiserfs_put_page(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 394 | kunmap(page); |
| 395 | page_cache_release(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | } |
| 397 | |
Jeff Mahoney | ec6ea56 | 2009-03-30 14:02:30 -0400 | [diff] [blame] | 398 | static struct page *reiserfs_get_page(struct inode *dir, size_t n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 400 | struct address_space *mapping = dir->i_mapping; |
| 401 | struct page *page; |
| 402 | /* We can deadlock if we try to free dentries, |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 403 | and an unlink/rmdir has just occurred - GFP_NOFS avoids this */ |
Al Viro | c4cdd03 | 2005-10-21 03:22:39 -0400 | [diff] [blame] | 404 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
Jeff Mahoney | ec6ea56 | 2009-03-30 14:02:30 -0400 | [diff] [blame] | 405 | page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 406 | if (!IS_ERR(page)) { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 407 | kmap(page); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 408 | if (PageError(page)) |
| 409 | goto fail; |
| 410 | } |
| 411 | return page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 413 | fail: |
| 414 | reiserfs_put_page(page); |
| 415 | return ERR_PTR(-EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | } |
| 417 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 418 | static inline __u32 xattr_hash(const char *msg, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 420 | return csum_partial(msg, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | } |
| 422 | |
Vladimir Saveliev | ba9d8ce | 2007-10-16 01:25:14 -0700 | [diff] [blame] | 423 | int reiserfs_commit_write(struct file *f, struct page *page, |
| 424 | unsigned from, unsigned to); |
Vladimir Saveliev | ba9d8ce | 2007-10-16 01:25:14 -0700 | [diff] [blame] | 425 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 426 | static void update_ctime(struct inode *inode) |
| 427 | { |
| 428 | struct timespec now = current_fs_time(inode->i_sb); |
Al Viro | 1d3382cb | 2010-10-23 15:19:20 -0400 | [diff] [blame] | 429 | if (inode_unhashed(inode) || !inode->i_nlink || |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 430 | timespec_equal(&inode->i_ctime, &now)) |
| 431 | return; |
| 432 | |
| 433 | inode->i_ctime = CURRENT_TIME_SEC; |
| 434 | mark_inode_dirty(inode); |
| 435 | } |
| 436 | |
| 437 | static int lookup_and_delete_xattr(struct inode *inode, const char *name) |
| 438 | { |
| 439 | int err = 0; |
| 440 | struct dentry *dentry, *xadir; |
| 441 | |
| 442 | xadir = open_xa_dir(inode, XATTR_REPLACE); |
| 443 | if (IS_ERR(xadir)) |
| 444 | return PTR_ERR(xadir); |
| 445 | |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 446 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 447 | dentry = lookup_one_len(name, xadir, strlen(name)); |
| 448 | if (IS_ERR(dentry)) { |
| 449 | err = PTR_ERR(dentry); |
| 450 | goto out_dput; |
| 451 | } |
| 452 | |
| 453 | if (dentry->d_inode) { |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 454 | err = xattr_unlink(xadir->d_inode, dentry); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 455 | update_ctime(inode); |
| 456 | } |
| 457 | |
| 458 | dput(dentry); |
| 459 | out_dput: |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 460 | mutex_unlock(&xadir->d_inode->i_mutex); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 461 | dput(xadir); |
| 462 | return err; |
| 463 | } |
| 464 | |
Vladimir Saveliev | ba9d8ce | 2007-10-16 01:25:14 -0700 | [diff] [blame] | 465 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | /* Generic extended attribute operations that can be used by xa plugins */ |
| 467 | |
| 468 | /* |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 469 | * inode->i_mutex: down |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | */ |
| 471 | int |
Jeff Mahoney | 0ab2621 | 2009-03-30 14:02:39 -0400 | [diff] [blame] | 472 | reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, |
| 473 | struct inode *inode, const char *name, |
| 474 | const void *buffer, size_t buffer_size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 476 | int err = 0; |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 477 | struct dentry *dentry; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 478 | struct page *page; |
| 479 | char *data; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 480 | size_t file_pos = 0; |
| 481 | size_t buffer_pos = 0; |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 482 | size_t new_size; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 483 | __u32 xahash = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 485 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
| 486 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | |
Frederic Weisbecker | 4f3be1b | 2010-01-05 02:14:30 +0100 | [diff] [blame] | 488 | if (!buffer) { |
| 489 | err = lookup_and_delete_xattr(inode, name); |
Frederic Weisbecker | 4f3be1b | 2010-01-05 02:14:30 +0100 | [diff] [blame] | 490 | return err; |
| 491 | } |
| 492 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 493 | dentry = xattr_lookup(inode, name, flags); |
Jeff Mahoney | 4c05141 | 2013-08-08 17:27:19 -0400 | [diff] [blame] | 494 | if (IS_ERR(dentry)) |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 495 | return PTR_ERR(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | |
Frederic Weisbecker | f3e22f4 | 2010-01-03 03:44:53 +0100 | [diff] [blame] | 497 | down_write(&REISERFS_I(inode)->i_xattr_sem); |
Frederic Weisbecker | 3f14fea | 2009-12-30 07:03:53 +0100 | [diff] [blame] | 498 | |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 499 | xahash = xattr_hash(buffer, buffer_size); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 500 | while (buffer_pos < buffer_size || buffer_pos == 0) { |
| 501 | size_t chunk; |
| 502 | size_t skip = 0; |
| 503 | size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1)); |
| 504 | if (buffer_size - buffer_pos > PAGE_CACHE_SIZE) |
| 505 | chunk = PAGE_CACHE_SIZE; |
| 506 | else |
| 507 | chunk = buffer_size - buffer_pos; |
| 508 | |
Jeff Mahoney | ec6ea56 | 2009-03-30 14:02:30 -0400 | [diff] [blame] | 509 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 510 | if (IS_ERR(page)) { |
| 511 | err = PTR_ERR(page); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 512 | goto out_unlock; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 513 | } |
| 514 | |
| 515 | lock_page(page); |
| 516 | data = page_address(page); |
| 517 | |
| 518 | if (file_pos == 0) { |
| 519 | struct reiserfs_xattr_header *rxh; |
| 520 | skip = file_pos = sizeof(struct reiserfs_xattr_header); |
| 521 | if (chunk + skip > PAGE_CACHE_SIZE) |
| 522 | chunk = PAGE_CACHE_SIZE - skip; |
| 523 | rxh = (struct reiserfs_xattr_header *)data; |
| 524 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); |
| 525 | rxh->h_hash = cpu_to_le32(xahash); |
| 526 | } |
| 527 | |
Jeff Mahoney | 4c05141 | 2013-08-08 17:27:19 -0400 | [diff] [blame] | 528 | reiserfs_write_lock(inode->i_sb); |
Christoph Hellwig | ebdec24 | 2010-10-06 10:47:23 +0200 | [diff] [blame] | 529 | err = __reiserfs_write_begin(page, page_offset, chunk + skip); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 530 | if (!err) { |
| 531 | if (buffer) |
| 532 | memcpy(data + skip, buffer + buffer_pos, chunk); |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 533 | err = reiserfs_commit_write(NULL, page, page_offset, |
| 534 | page_offset + chunk + |
| 535 | skip); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 536 | } |
Jeff Mahoney | 4c05141 | 2013-08-08 17:27:19 -0400 | [diff] [blame] | 537 | reiserfs_write_unlock(inode->i_sb); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 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), |
Jeff Mahoney | fb2162d | 2010-04-23 13:17:41 -0400 | [diff] [blame] | 551 | .ia_size = new_size, |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 552 | .ia_valid = ATTR_SIZE | ATTR_CTIME, |
| 553 | }; |
Frederic Weisbecker | 31370f6 | 2010-01-07 15:55:31 +0100 | [diff] [blame] | 554 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 555 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR); |
Christoph Hellwig | bd5fe6c | 2011-06-24 14:29:43 -0400 | [diff] [blame] | 556 | inode_dio_wait(dentry->d_inode); |
Frederic Weisbecker | 31370f6 | 2010-01-07 15:55:31 +0100 | [diff] [blame] | 557 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 558 | err = reiserfs_setattr(dentry, &newattrs); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 559 | mutex_unlock(&dentry->d_inode->i_mutex); |
| 560 | } else |
| 561 | update_ctime(inode); |
| 562 | out_unlock: |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 563 | up_write(&REISERFS_I(inode)->i_xattr_sem); |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 564 | dput(dentry); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 565 | return err; |
| 566 | } |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 567 | |
Jeff Mahoney | 0ab2621 | 2009-03-30 14:02:39 -0400 | [diff] [blame] | 568 | /* We need to start a transaction to maintain lock ordering */ |
| 569 | int reiserfs_xattr_set(struct inode *inode, const char *name, |
| 570 | const void *buffer, size_t buffer_size, int flags) |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 571 | { |
Jeff Mahoney | 0ab2621 | 2009-03-30 14:02:39 -0400 | [diff] [blame] | 572 | |
| 573 | struct reiserfs_transaction_handle th; |
| 574 | int error, error2; |
| 575 | size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size); |
| 576 | |
| 577 | if (!(flags & XATTR_REPLACE)) |
| 578 | jbegin_count += reiserfs_xattr_jcreate_nblocks(inode); |
| 579 | |
| 580 | reiserfs_write_lock(inode->i_sb); |
| 581 | error = journal_begin(&th, inode->i_sb, jbegin_count); |
Jeff Mahoney | 4c05141 | 2013-08-08 17:27:19 -0400 | [diff] [blame] | 582 | reiserfs_write_unlock(inode->i_sb); |
Jeff Mahoney | 0ab2621 | 2009-03-30 14:02:39 -0400 | [diff] [blame] | 583 | if (error) { |
Jeff Mahoney | 0ab2621 | 2009-03-30 14:02:39 -0400 | [diff] [blame] | 584 | return error; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 585 | } |
| 586 | |
Jeff Mahoney | 0ab2621 | 2009-03-30 14:02:39 -0400 | [diff] [blame] | 587 | error = reiserfs_xattr_set_handle(&th, inode, name, |
| 588 | buffer, buffer_size, flags); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 589 | |
Jeff Mahoney | 4c05141 | 2013-08-08 17:27:19 -0400 | [diff] [blame] | 590 | reiserfs_write_lock(inode->i_sb); |
Jeff Mahoney | 0ab2621 | 2009-03-30 14:02:39 -0400 | [diff] [blame] | 591 | error2 = journal_end(&th, inode->i_sb, jbegin_count); |
Jeff Mahoney | 4c05141 | 2013-08-08 17:27:19 -0400 | [diff] [blame] | 592 | reiserfs_write_unlock(inode->i_sb); |
Jeff Mahoney | 0ab2621 | 2009-03-30 14:02:39 -0400 | [diff] [blame] | 593 | if (error == 0) |
| 594 | error = error2; |
Jeff Mahoney | 0ab2621 | 2009-03-30 14:02:39 -0400 | [diff] [blame] | 595 | |
| 596 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | } |
| 598 | |
| 599 | /* |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 600 | * inode->i_mutex: down |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | */ |
| 602 | int |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 603 | reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 604 | size_t buffer_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 606 | ssize_t err = 0; |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 607 | struct dentry *dentry; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 608 | size_t isize; |
| 609 | size_t file_pos = 0; |
| 610 | size_t buffer_pos = 0; |
| 611 | struct page *page; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 612 | __u32 hash = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 614 | if (name == NULL) |
| 615 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 617 | /* We can't have xattrs attached to v1 items since they don't have |
| 618 | * generation numbers */ |
| 619 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
| 620 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 622 | dentry = xattr_lookup(inode, name, XATTR_REPLACE); |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 623 | if (IS_ERR(dentry)) { |
| 624 | err = PTR_ERR(dentry); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 625 | goto out; |
| 626 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 628 | down_read(&REISERFS_I(inode)->i_xattr_sem); |
Jeff Mahoney | d984561 | 2009-03-30 14:02:35 -0400 | [diff] [blame] | 629 | |
Jeff Mahoney | f437c52 | 2009-03-30 14:02:29 -0400 | [diff] [blame] | 630 | isize = i_size_read(dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 632 | /* Just return the size needed */ |
| 633 | if (buffer == NULL) { |
| 634 | err = isize - sizeof(struct reiserfs_xattr_header); |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 635 | goto out_unlock; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 636 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 638 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { |
| 639 | err = -ERANGE; |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 640 | goto out_unlock; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 641 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 643 | while (file_pos < isize) { |
| 644 | size_t chunk; |
| 645 | char *data; |
| 646 | size_t skip = 0; |
| 647 | if (isize - file_pos > PAGE_CACHE_SIZE) |
| 648 | chunk = PAGE_CACHE_SIZE; |
| 649 | else |
| 650 | chunk = isize - file_pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | |
Jeff Mahoney | ec6ea56 | 2009-03-30 14:02:30 -0400 | [diff] [blame] | 652 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 653 | if (IS_ERR(page)) { |
| 654 | err = PTR_ERR(page); |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 655 | goto out_unlock; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 656 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 658 | lock_page(page); |
| 659 | data = page_address(page); |
| 660 | if (file_pos == 0) { |
| 661 | struct reiserfs_xattr_header *rxh = |
| 662 | (struct reiserfs_xattr_header *)data; |
| 663 | skip = file_pos = sizeof(struct reiserfs_xattr_header); |
| 664 | chunk -= skip; |
| 665 | /* Magic doesn't match up.. */ |
| 666 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { |
| 667 | unlock_page(page); |
| 668 | reiserfs_put_page(page); |
Jeff Mahoney | 45b03d5 | 2009-03-30 14:02:21 -0400 | [diff] [blame] | 669 | reiserfs_warning(inode->i_sb, "jdm-20001", |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 670 | "Invalid magic for xattr (%s) " |
| 671 | "associated with %k", name, |
| 672 | INODE_PKEY(inode)); |
| 673 | err = -EIO; |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 674 | goto out_unlock; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 675 | } |
| 676 | hash = le32_to_cpu(rxh->h_hash); |
| 677 | } |
| 678 | memcpy(buffer + buffer_pos, data + skip, chunk); |
| 679 | unlock_page(page); |
| 680 | reiserfs_put_page(page); |
| 681 | file_pos += chunk; |
| 682 | buffer_pos += chunk; |
| 683 | skip = 0; |
| 684 | } |
| 685 | err = isize - sizeof(struct reiserfs_xattr_header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 687 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != |
| 688 | hash) { |
Jeff Mahoney | 45b03d5 | 2009-03-30 14:02:21 -0400 | [diff] [blame] | 689 | reiserfs_warning(inode->i_sb, "jdm-20002", |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 690 | "Invalid hash for xattr (%s) associated " |
| 691 | "with %k", name, INODE_PKEY(inode)); |
| 692 | err = -EIO; |
| 693 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 695 | out_unlock: |
| 696 | up_read(&REISERFS_I(inode)->i_xattr_sem); |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 697 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 699 | out: |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 700 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | } |
| 702 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 703 | /* |
| 704 | * In order to implement different sets of xattr operations for each xattr |
| 705 | * prefix with the generic xattr API, a filesystem should create a |
| 706 | * null-terminated array of struct xattr_handler (one for each prefix) and |
| 707 | * hang a pointer to it off of the s_xattr field of the superblock. |
| 708 | * |
| 709 | * The generic_fooxattr() functions will use this list to dispatch xattr |
| 710 | * operations to the correct xattr_handler. |
| 711 | */ |
| 712 | #define for_each_xattr_handler(handlers, handler) \ |
| 713 | for ((handler) = *(handlers)++; \ |
| 714 | (handler) != NULL; \ |
| 715 | (handler) = *(handlers)++) |
| 716 | |
| 717 | /* This is the implementation for the xattr plugin infrastructure */ |
Stephen Hemminger | 94d09a9 | 2010-05-13 17:53:19 -0700 | [diff] [blame] | 718 | static inline const struct xattr_handler * |
| 719 | find_xattr_handler_prefix(const struct xattr_handler **handlers, |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 720 | const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | { |
Stephen Hemminger | 94d09a9 | 2010-05-13 17:53:19 -0700 | [diff] [blame] | 722 | const struct xattr_handler *xah; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 724 | if (!handlers) |
| 725 | return NULL; |
| 726 | |
| 727 | for_each_xattr_handler(handlers, xah) { |
| 728 | if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0) |
| 729 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | } |
| 731 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 732 | return xah; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | } |
| 734 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | |
| 736 | /* |
| 737 | * Inode operation getxattr() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | */ |
| 739 | ssize_t |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 740 | reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, |
| 741 | size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | { |
Stephen Hemminger | 94d09a9 | 2010-05-13 17:53:19 -0700 | [diff] [blame] | 743 | const struct xattr_handler *handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 745 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 746 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 747 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 748 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 750 | return handler->get(dentry, name, buffer, size, handler->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | } |
| 752 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | /* |
| 754 | * Inode operation setxattr() |
| 755 | * |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 756 | * dentry->d_inode->i_mutex down |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | */ |
| 758 | int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 759 | reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
| 760 | size_t size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | { |
Stephen Hemminger | 94d09a9 | 2010-05-13 17:53:19 -0700 | [diff] [blame] | 762 | const struct xattr_handler *handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 764 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 765 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 766 | if (!handler || get_inode_sd_version(dentry->d_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 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 769 | return handler->set(dentry, name, value, size, flags, handler->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 | { |
Stephen Hemminger | 94d09a9 | 2010-05-13 17:53:19 -0700 | [diff] [blame] | 779 | const struct xattr_handler *handler; |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 780 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 782 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 783 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 785 | return handler->set(dentry, name, NULL, 0, XATTR_REPLACE, handler->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | } |
| 787 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 788 | struct listxattr_buf { |
Al Viro | 4acf381 | 2013-05-17 22:42:17 -0400 | [diff] [blame] | 789 | struct dir_context ctx; |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 790 | size_t size; |
| 791 | size_t pos; |
| 792 | char *buf; |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 793 | struct dentry *dentry; |
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))) { |
Stephen Hemminger | 94d09a9 | 2010-05-13 17:53:19 -0700 | [diff] [blame] | 803 | const struct xattr_handler *handler; |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 804 | handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr, |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 805 | name); |
| 806 | if (!handler) /* Unsupported xattr name */ |
| 807 | return 0; |
| 808 | if (b->buf) { |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 809 | size = handler->list(b->dentry, b->buf + b->pos, |
| 810 | b->size, name, namelen, |
| 811 | handler->flags); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 812 | if (size > b->size) |
| 813 | return -ERANGE; |
| 814 | } else { |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 815 | size = handler->list(b->dentry, NULL, 0, name, |
| 816 | namelen, handler->flags); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 817 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 819 | b->pos += size; |
| 820 | } |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 821 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | } |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 823 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | /* |
| 825 | * Inode operation listxattr() |
| 826 | * |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 827 | * We totally ignore the generic listxattr here because it would be stupid |
| 828 | * not to. Since the xattrs are organized in a directory, we can just |
| 829 | * readdir to find them. |
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 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 833 | struct dentry *dir; |
| 834 | int err = 0; |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 835 | struct listxattr_buf buf = { |
Al Viro | 4acf381 | 2013-05-17 22:42:17 -0400 | [diff] [blame] | 836 | .ctx.actor = listxattr_filler, |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 837 | .dentry = dentry, |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 838 | .buf = buffer, |
| 839 | .size = buffer ? size : 0, |
| 840 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 842 | if (!dentry->d_inode) |
| 843 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | |
Jeff Mahoney | 677c9b2 | 2009-05-05 15:30:17 -0400 | [diff] [blame] | 845 | if (!dentry->d_sb->s_xattr || |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 846 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
| 847 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 849 | dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 850 | if (IS_ERR(dir)) { |
| 851 | err = PTR_ERR(dir); |
| 852 | if (err == -ENODATA) |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 853 | err = 0; /* Not an error if there aren't any xattrs */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 854 | goto out; |
| 855 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 857 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
Al Viro | cd62cda | 2013-05-17 22:58:58 -0400 | [diff] [blame] | 858 | err = reiserfs_readdir_inode(dir->d_inode, &buf.ctx); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 859 | mutex_unlock(&dir->d_inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 861 | if (!err) |
| 862 | err = buf.pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 864 | dput(dir); |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 865 | out: |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 866 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | } |
| 868 | |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 869 | static int create_privroot(struct dentry *dentry) |
| 870 | { |
| 871 | int err; |
| 872 | struct inode *inode = dentry->d_parent->d_inode; |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 873 | WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex)); |
| 874 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 875 | err = xattr_mkdir(inode, dentry, 0700); |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 876 | if (err || !dentry->d_inode) { |
| 877 | reiserfs_warning(dentry->d_sb, "jdm-20006", |
| 878 | "xattrs/ACLs enabled and couldn't " |
| 879 | "find/create .reiserfs_priv. " |
| 880 | "Failing mount."); |
| 881 | return -EOPNOTSUPP; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 882 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 884 | dentry->d_inode->i_flags |= S_PRIVATE; |
| 885 | reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr " |
| 886 | "storage.\n", PRIVROOT_NAME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 888 | return 0; |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 889 | } |
| 890 | |
Jeff Mahoney | 12abb35 | 2009-05-17 01:02:01 -0400 | [diff] [blame] | 891 | #else |
| 892 | int __init reiserfs_xattr_register_handlers(void) { return 0; } |
| 893 | void reiserfs_xattr_unregister_handlers(void) {} |
| 894 | static int create_privroot(struct dentry *dentry) { return 0; } |
| 895 | #endif |
| 896 | |
| 897 | /* Actual operations that are exported to VFS-land */ |
Sachin Kamat | da02eb7 | 2012-08-23 17:28:57 +0200 | [diff] [blame] | 898 | static const struct xattr_handler *reiserfs_xattr_handlers[] = { |
Jeff Mahoney | 12abb35 | 2009-05-17 01:02:01 -0400 | [diff] [blame] | 899 | #ifdef CONFIG_REISERFS_FS_XATTR |
| 900 | &reiserfs_xattr_user_handler, |
| 901 | &reiserfs_xattr_trusted_handler, |
| 902 | #endif |
| 903 | #ifdef CONFIG_REISERFS_FS_SECURITY |
| 904 | &reiserfs_xattr_security_handler, |
| 905 | #endif |
| 906 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL |
| 907 | &reiserfs_posix_acl_access_handler, |
| 908 | &reiserfs_posix_acl_default_handler, |
| 909 | #endif |
| 910 | NULL |
| 911 | }; |
| 912 | |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 913 | static int xattr_mount_check(struct super_block *s) |
| 914 | { |
| 915 | /* We need generation numbers to ensure that the oid mapping is correct |
| 916 | * v3.5 filesystems don't have them. */ |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 917 | if (old_format_only(s)) { |
| 918 | if (reiserfs_xattrs_optional(s)) { |
| 919 | /* Old format filesystem, but optional xattrs have |
| 920 | * been enabled. Error out. */ |
| 921 | reiserfs_warning(s, "jdm-2005", |
| 922 | "xattrs/ACLs not supported " |
| 923 | "on pre-v3.6 format filesystems. " |
| 924 | "Failing mount."); |
| 925 | return -EOPNOTSUPP; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 926 | } |
| 927 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 929 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | } |
| 931 | |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 932 | int reiserfs_permission(struct inode *inode, int mask) |
Jeff Mahoney | b83674c | 2009-05-17 01:02:03 -0400 | [diff] [blame] | 933 | { |
| 934 | /* |
| 935 | * We don't do permission checks on the internal objects. |
| 936 | * Permissions are determined by the "owning" object. |
| 937 | */ |
| 938 | if (IS_PRIVATE(inode)) |
| 939 | return 0; |
| 940 | |
Al Viro | 2830ba7 | 2011-06-20 19:16:29 -0400 | [diff] [blame] | 941 | return generic_permission(inode, mask); |
Jeff Mahoney | b83674c | 2009-05-17 01:02:03 -0400 | [diff] [blame] | 942 | } |
| 943 | |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 944 | static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | { |
Jeff Mahoney | cac36f7 | 2010-04-23 13:17:37 -0400 | [diff] [blame] | 946 | return -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | } |
| 948 | |
Al Viro | e16404e | 2009-02-20 05:55:13 +0000 | [diff] [blame] | 949 | static const struct dentry_operations xattr_lookup_poison_ops = { |
Jeff Mahoney | cac36f7 | 2010-04-23 13:17:37 -0400 | [diff] [blame] | 950 | .d_revalidate = xattr_hide_revalidate, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | }; |
| 952 | |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 953 | int reiserfs_lookup_privroot(struct super_block *s) |
| 954 | { |
| 955 | struct dentry *dentry; |
| 956 | int err = 0; |
| 957 | |
| 958 | /* If we don't have the privroot located yet - go find it */ |
Jeff Mahoney | 4c05141 | 2013-08-08 17:27:19 -0400 | [diff] [blame] | 959 | mutex_lock(&s->s_root->d_inode->i_mutex); |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 960 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, |
| 961 | strlen(PRIVROOT_NAME)); |
| 962 | if (!IS_ERR(dentry)) { |
| 963 | REISERFS_SB(s)->priv_root = dentry; |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 964 | d_set_d_op(dentry, &xattr_lookup_poison_ops); |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 965 | if (dentry->d_inode) |
| 966 | dentry->d_inode->i_flags |= S_PRIVATE; |
| 967 | } else |
| 968 | err = PTR_ERR(dentry); |
| 969 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
| 970 | |
| 971 | return err; |
| 972 | } |
| 973 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | /* We need to take a copy of the mount flags since things like |
| 975 | * MS_RDONLY don't get set until *after* we're called. |
| 976 | * mount_flags != mount_options */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 977 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 979 | int err = 0; |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 980 | struct dentry *privroot = REISERFS_SB(s)->priv_root; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 982 | err = xattr_mount_check(s); |
| 983 | if (err) |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 984 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 986 | if (!privroot->d_inode && !(mount_flags & MS_RDONLY)) { |
Jeff Mahoney | 4c05141 | 2013-08-08 17:27:19 -0400 | [diff] [blame] | 987 | mutex_lock(&s->s_root->d_inode->i_mutex); |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 988 | err = create_privroot(REISERFS_SB(s)->priv_root); |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 989 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 990 | } |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 991 | |
| 992 | if (privroot->d_inode) { |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 993 | s->s_xattr = reiserfs_xattr_handlers; |
Jeff Mahoney | 4c05141 | 2013-08-08 17:27:19 -0400 | [diff] [blame] | 994 | mutex_lock(&privroot->d_inode->i_mutex); |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 995 | if (!REISERFS_SB(s)->xattr_root) { |
| 996 | struct dentry *dentry; |
| 997 | dentry = lookup_one_len(XAROOT_NAME, privroot, |
| 998 | strlen(XAROOT_NAME)); |
| 999 | if (!IS_ERR(dentry)) |
| 1000 | REISERFS_SB(s)->xattr_root = dentry; |
| 1001 | else |
| 1002 | err = PTR_ERR(dentry); |
| 1003 | } |
| 1004 | mutex_unlock(&privroot->d_inode->i_mutex); |
| 1005 | } |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 1006 | |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 1007 | error: |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1008 | if (err) { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1009 | clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt)); |
| 1010 | clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt)); |
| 1011 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1013 | /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1014 | if (reiserfs_posixacl(s)) |
| 1015 | s->s_flags |= MS_POSIXACL; |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 1016 | else |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 1017 | s->s_flags &= ~MS_POSIXACL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1019 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | } |