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 | |
Frederic Weisbecker | 4dd8596 | 2009-12-30 07:26:28 +0100 | [diff] [blame] | 84 | reiserfs_mutex_lock_nested_safe(&dentry->d_inode->i_mutex, |
| 85 | I_MUTEX_CHILD, dir->i_sb); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 86 | error = dir->i_op->unlink(dir, dentry); |
| 87 | mutex_unlock(&dentry->d_inode->i_mutex); |
| 88 | |
| 89 | if (!error) |
| 90 | d_delete(dentry); |
| 91 | return error; |
| 92 | } |
| 93 | |
| 94 | static int xattr_rmdir(struct inode *dir, struct dentry *dentry) |
| 95 | { |
| 96 | int error; |
| 97 | BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 98 | |
Frederic Weisbecker | 835d524 | 2009-12-30 07:40:39 +0100 | [diff] [blame] | 99 | reiserfs_mutex_lock_nested_safe(&dentry->d_inode->i_mutex, |
| 100 | I_MUTEX_CHILD, dir->i_sb); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 101 | error = dir->i_op->rmdir(dir, dentry); |
| 102 | if (!error) |
| 103 | dentry->d_inode->i_flags |= S_DEAD; |
| 104 | mutex_unlock(&dentry->d_inode->i_mutex); |
| 105 | if (!error) |
| 106 | d_delete(dentry); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 107 | |
| 108 | return error; |
| 109 | } |
| 110 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 111 | #define xattr_may_create(flags) (!flags || flags & XATTR_CREATE) |
| 112 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 113 | static struct dentry *open_xa_root(struct super_block *sb, int flags) |
| 114 | { |
| 115 | struct dentry *privroot = REISERFS_SB(sb)->priv_root; |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 116 | struct dentry *xaroot; |
| 117 | if (!privroot->d_inode) |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 118 | return ERR_PTR(-ENODATA); |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 119 | |
| 120 | mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR); |
| 121 | |
| 122 | xaroot = dget(REISERFS_SB(sb)->xattr_root); |
Jeff Mahoney | ceb5edc | 2009-05-17 01:02:02 -0400 | [diff] [blame] | 123 | if (!xaroot) |
| 124 | xaroot = ERR_PTR(-ENODATA); |
| 125 | else if (!xaroot->d_inode) { |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 126 | int err = -ENODATA; |
| 127 | if (xattr_may_create(flags)) |
| 128 | err = xattr_mkdir(privroot->d_inode, xaroot, 0700); |
| 129 | if (err) { |
| 130 | dput(xaroot); |
| 131 | xaroot = ERR_PTR(err); |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | mutex_unlock(&privroot->d_inode->i_mutex); |
| 136 | return xaroot; |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 137 | } |
| 138 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 139 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 141 | struct dentry *xaroot, *xadir; |
| 142 | char namebuf[17]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 144 | xaroot = open_xa_root(inode->i_sb, flags); |
Jeff Mahoney | 9b7f375 | 2007-04-23 14:41:17 -0700 | [diff] [blame] | 145 | if (IS_ERR(xaroot)) |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 146 | return xaroot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 148 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
| 149 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), |
| 150 | inode->i_generation); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 152 | mutex_lock_nested(&xaroot->d_inode->i_mutex, I_MUTEX_XATTR); |
| 153 | |
| 154 | xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf)); |
| 155 | if (!IS_ERR(xadir) && !xadir->d_inode) { |
| 156 | int err = -ENODATA; |
| 157 | if (xattr_may_create(flags)) |
| 158 | err = xattr_mkdir(xaroot->d_inode, xadir, 0700); |
| 159 | if (err) { |
| 160 | dput(xadir); |
| 161 | xadir = ERR_PTR(err); |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | mutex_unlock(&xaroot->d_inode->i_mutex); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 166 | dput(xaroot); |
| 167 | return xadir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | } |
| 169 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 170 | /* The following are side effects of other operations that aren't explicitly |
| 171 | * modifying extended attributes. This includes operations such as permissions |
| 172 | * or ownership changes, object deletions, etc. */ |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 173 | struct reiserfs_dentry_buf { |
Al Viro | 4acf381 | 2013-05-17 22:42:17 -0400 | [diff] [blame] | 174 | struct dir_context ctx; |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 175 | struct dentry *xadir; |
| 176 | int count; |
| 177 | struct dentry *dentries[8]; |
| 178 | }; |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 179 | |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 180 | static int |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 181 | fill_with_dentries(void *buf, const char *name, int namelen, loff_t offset, |
| 182 | u64 ino, unsigned int d_type) |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 183 | { |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 184 | struct reiserfs_dentry_buf *dbuf = buf; |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 185 | struct dentry *dentry; |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 186 | WARN_ON_ONCE(!mutex_is_locked(&dbuf->xadir->d_inode->i_mutex)); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 187 | |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 188 | if (dbuf->count == ARRAY_SIZE(dbuf->dentries)) |
| 189 | return -ENOSPC; |
| 190 | |
Jan Kara | 35e5cbc | 2013-03-29 15:39:16 +0100 | [diff] [blame] | 191 | if (name[0] == '.' && (namelen < 2 || |
| 192 | (namelen == 2 && name[1] == '.'))) |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 193 | return 0; |
| 194 | |
| 195 | dentry = lookup_one_len(name, dbuf->xadir, namelen); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 196 | if (IS_ERR(dentry)) { |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 197 | return PTR_ERR(dentry); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 198 | } else if (!dentry->d_inode) { |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 199 | /* A directory entry exists, but no file? */ |
| 200 | reiserfs_error(dentry->d_sb, "xattr-20003", |
| 201 | "Corrupted directory: xattr %s listed but " |
| 202 | "not found for file %s.\n", |
| 203 | dentry->d_name.name, dbuf->xadir->d_name.name); |
| 204 | dput(dentry); |
| 205 | return -EIO; |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 206 | } |
| 207 | |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 208 | dbuf->dentries[dbuf->count++] = dentry; |
| 209 | return 0; |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 210 | } |
| 211 | |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 212 | static void |
| 213 | cleanup_dentry_buf(struct reiserfs_dentry_buf *buf) |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 214 | { |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 215 | int i; |
| 216 | for (i = 0; i < buf->count; i++) |
| 217 | if (buf->dentries[i]) |
| 218 | dput(buf->dentries[i]); |
| 219 | } |
| 220 | |
| 221 | static int reiserfs_for_each_xattr(struct inode *inode, |
| 222 | int (*action)(struct dentry *, void *), |
| 223 | void *data) |
| 224 | { |
| 225 | struct dentry *dir; |
| 226 | int i, err = 0; |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 227 | struct reiserfs_dentry_buf buf = { |
Al Viro | 4acf381 | 2013-05-17 22:42:17 -0400 | [diff] [blame] | 228 | .ctx.actor = fill_with_dentries, |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 229 | }; |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 230 | |
| 231 | /* Skip out, an xattr has no xattrs associated with it */ |
| 232 | if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1) |
| 233 | return 0; |
| 234 | |
Frederic Weisbecker | 27026a0 | 2009-12-30 05:06:21 +0100 | [diff] [blame] | 235 | reiserfs_write_unlock(inode->i_sb); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 236 | dir = open_xa_dir(inode, XATTR_REPLACE); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 237 | if (IS_ERR(dir)) { |
| 238 | err = PTR_ERR(dir); |
Frederic Weisbecker | 27026a0 | 2009-12-30 05:06:21 +0100 | [diff] [blame] | 239 | reiserfs_write_lock(inode->i_sb); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 240 | goto out; |
| 241 | } else if (!dir->d_inode) { |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 242 | err = 0; |
Frederic Weisbecker | 27026a0 | 2009-12-30 05:06:21 +0100 | [diff] [blame] | 243 | reiserfs_write_lock(inode->i_sb); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 244 | goto out_dir; |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 245 | } |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 246 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 247 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
Frederic Weisbecker | 27026a0 | 2009-12-30 05:06:21 +0100 | [diff] [blame] | 248 | |
| 249 | reiserfs_write_lock(inode->i_sb); |
| 250 | |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 251 | buf.xadir = dir; |
Al Viro | cd62cda | 2013-05-17 22:58:58 -0400 | [diff] [blame] | 252 | while (1) { |
| 253 | err = reiserfs_readdir_inode(dir->d_inode, &buf.ctx); |
| 254 | if (err) |
| 255 | break; |
| 256 | if (!buf.count) |
| 257 | break; |
| 258 | for (i = 0; !err && i < buf.count && buf.dentries[i]; i++) { |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 259 | struct dentry *dentry = buf.dentries[i]; |
| 260 | |
Al Viro | cd62cda | 2013-05-17 22:58:58 -0400 | [diff] [blame] | 261 | if (!S_ISDIR(dentry->d_inode->i_mode)) |
| 262 | err = action(dentry, data); |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 263 | |
| 264 | dput(dentry); |
| 265 | buf.dentries[i] = NULL; |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 266 | } |
Al Viro | cd62cda | 2013-05-17 22:58:58 -0400 | [diff] [blame] | 267 | if (err) |
| 268 | break; |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 269 | buf.count = 0; |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 270 | } |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 271 | mutex_unlock(&dir->d_inode->i_mutex); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 272 | |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 273 | cleanup_dentry_buf(&buf); |
| 274 | |
| 275 | if (!err) { |
| 276 | /* We start a transaction here to avoid a ABBA situation |
| 277 | * between the xattr root's i_mutex and the journal lock. |
| 278 | * This doesn't incur much additional overhead since the |
| 279 | * new transaction will just nest inside the |
| 280 | * outer transaction. */ |
| 281 | int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + |
| 282 | 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); |
| 283 | struct reiserfs_transaction_handle th; |
| 284 | err = journal_begin(&th, inode->i_sb, blocks); |
| 285 | if (!err) { |
| 286 | int jerror; |
Frederic Weisbecker | 8b513f5 | 2009-12-30 07:28:58 +0100 | [diff] [blame] | 287 | reiserfs_mutex_lock_nested_safe( |
| 288 | &dir->d_parent->d_inode->i_mutex, |
| 289 | I_MUTEX_XATTR, inode->i_sb); |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 290 | err = action(dir, data); |
| 291 | jerror = journal_end(&th, inode->i_sb, blocks); |
| 292 | mutex_unlock(&dir->d_parent->d_inode->i_mutex); |
| 293 | err = jerror ?: err; |
| 294 | } |
| 295 | } |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 296 | out_dir: |
| 297 | dput(dir); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 298 | out: |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 299 | /* -ENODATA isn't an error */ |
| 300 | if (err == -ENODATA) |
| 301 | err = 0; |
| 302 | return err; |
| 303 | } |
| 304 | |
| 305 | static int delete_one_xattr(struct dentry *dentry, void *data) |
| 306 | { |
| 307 | struct inode *dir = dentry->d_parent->d_inode; |
| 308 | |
| 309 | /* This is the xattr dir, handle specially. */ |
| 310 | if (S_ISDIR(dentry->d_inode->i_mode)) |
| 311 | return xattr_rmdir(dir, dentry); |
| 312 | |
| 313 | return xattr_unlink(dir, dentry); |
| 314 | } |
| 315 | |
| 316 | static int chown_one_xattr(struct dentry *dentry, void *data) |
| 317 | { |
| 318 | struct iattr *attrs = data; |
Jeff Mahoney | 4a85701 | 2013-05-31 15:54:17 -0400 | [diff] [blame] | 319 | int ia_valid = attrs->ia_valid; |
| 320 | int err; |
| 321 | |
| 322 | /* |
| 323 | * We only want the ownership bits. Otherwise, we'll do |
| 324 | * things like change a directory to a regular file if |
| 325 | * ATTR_MODE is set. |
| 326 | */ |
| 327 | attrs->ia_valid &= (ATTR_UID|ATTR_GID); |
| 328 | err = reiserfs_setattr(dentry, attrs); |
| 329 | attrs->ia_valid = ia_valid; |
| 330 | |
| 331 | return err; |
Jeff Mahoney | a41f1a4 | 2009-03-30 14:02:40 -0400 | [diff] [blame] | 332 | } |
| 333 | |
| 334 | /* No i_mutex, but the inode is unconnected. */ |
| 335 | int reiserfs_delete_xattrs(struct inode *inode) |
| 336 | { |
| 337 | int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); |
| 338 | if (err) |
| 339 | reiserfs_warning(inode->i_sb, "jdm-20004", |
| 340 | "Couldn't delete all xattrs (%d)\n", err); |
| 341 | return err; |
| 342 | } |
| 343 | |
| 344 | /* inode->i_mutex: down */ |
| 345 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
| 346 | { |
| 347 | int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 348 | if (err) |
| 349 | reiserfs_warning(inode->i_sb, "jdm-20007", |
| 350 | "Couldn't chown all xattrs (%d)\n", err); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 351 | return err; |
| 352 | } |
| 353 | |
| 354 | #ifdef CONFIG_REISERFS_FS_XATTR |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | /* Returns a dentry corresponding to a specific extended attribute file |
| 356 | * for the inode. If flags allow, the file is created. Otherwise, a |
| 357 | * valid or negative dentry, or an error is returned. */ |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 358 | static struct dentry *xattr_lookup(struct inode *inode, const char *name, |
| 359 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 361 | struct dentry *xadir, *xafile; |
| 362 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 364 | xadir = open_xa_dir(inode, flags); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 365 | if (IS_ERR(xadir)) |
David Howells | e231c2e | 2008-02-07 00:15:26 -0800 | [diff] [blame] | 366 | return ERR_CAST(xadir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 368 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 369 | xafile = lookup_one_len(name, xadir, strlen(name)); |
| 370 | if (IS_ERR(xafile)) { |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 371 | err = PTR_ERR(xafile); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 372 | goto out; |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 373 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 375 | if (xafile->d_inode && (flags & XATTR_CREATE)) |
| 376 | err = -EEXIST; |
| 377 | |
| 378 | if (!xafile->d_inode) { |
| 379 | err = -ENODATA; |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 380 | if (xattr_may_create(flags)) |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 381 | err = xattr_create(xadir->d_inode, xafile, |
| 382 | 0700|S_IFREG); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 383 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 385 | if (err) |
| 386 | dput(xafile); |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 387 | out: |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 388 | mutex_unlock(&xadir->d_inode->i_mutex); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 389 | dput(xadir); |
| 390 | if (err) |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 391 | return ERR_PTR(err); |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 392 | return xafile; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | } |
| 394 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | /* Internal operations on file data */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 396 | static inline void reiserfs_put_page(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 398 | kunmap(page); |
| 399 | page_cache_release(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | } |
| 401 | |
Jeff Mahoney | ec6ea56 | 2009-03-30 14:02:30 -0400 | [diff] [blame] | 402 | static struct page *reiserfs_get_page(struct inode *dir, size_t n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 404 | struct address_space *mapping = dir->i_mapping; |
| 405 | struct page *page; |
| 406 | /* We can deadlock if we try to free dentries, |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 407 | and an unlink/rmdir has just occurred - GFP_NOFS avoids this */ |
Al Viro | c4cdd03 | 2005-10-21 03:22:39 -0400 | [diff] [blame] | 408 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
Jeff Mahoney | ec6ea56 | 2009-03-30 14:02:30 -0400 | [diff] [blame] | 409 | page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 410 | if (!IS_ERR(page)) { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 411 | kmap(page); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 412 | if (PageError(page)) |
| 413 | goto fail; |
| 414 | } |
| 415 | return page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 417 | fail: |
| 418 | reiserfs_put_page(page); |
| 419 | return ERR_PTR(-EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | } |
| 421 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 422 | static inline __u32 xattr_hash(const char *msg, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 424 | return csum_partial(msg, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | } |
| 426 | |
Vladimir Saveliev | ba9d8ce | 2007-10-16 01:25:14 -0700 | [diff] [blame] | 427 | int reiserfs_commit_write(struct file *f, struct page *page, |
| 428 | unsigned from, unsigned to); |
Vladimir Saveliev | ba9d8ce | 2007-10-16 01:25:14 -0700 | [diff] [blame] | 429 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 430 | static void update_ctime(struct inode *inode) |
| 431 | { |
| 432 | struct timespec now = current_fs_time(inode->i_sb); |
Al Viro | 1d3382cb | 2010-10-23 15:19:20 -0400 | [diff] [blame] | 433 | if (inode_unhashed(inode) || !inode->i_nlink || |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 434 | timespec_equal(&inode->i_ctime, &now)) |
| 435 | return; |
| 436 | |
| 437 | inode->i_ctime = CURRENT_TIME_SEC; |
| 438 | mark_inode_dirty(inode); |
| 439 | } |
| 440 | |
| 441 | static int lookup_and_delete_xattr(struct inode *inode, const char *name) |
| 442 | { |
| 443 | int err = 0; |
| 444 | struct dentry *dentry, *xadir; |
| 445 | |
| 446 | xadir = open_xa_dir(inode, XATTR_REPLACE); |
| 447 | if (IS_ERR(xadir)) |
| 448 | return PTR_ERR(xadir); |
| 449 | |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 450 | mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 451 | dentry = lookup_one_len(name, xadir, strlen(name)); |
| 452 | if (IS_ERR(dentry)) { |
| 453 | err = PTR_ERR(dentry); |
| 454 | goto out_dput; |
| 455 | } |
| 456 | |
| 457 | if (dentry->d_inode) { |
Frederic Weisbecker | 4f3be1b | 2010-01-05 02:14:30 +0100 | [diff] [blame] | 458 | reiserfs_write_lock(inode->i_sb); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 459 | err = xattr_unlink(xadir->d_inode, dentry); |
Frederic Weisbecker | 4f3be1b | 2010-01-05 02:14:30 +0100 | [diff] [blame] | 460 | reiserfs_write_unlock(inode->i_sb); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 461 | update_ctime(inode); |
| 462 | } |
| 463 | |
| 464 | dput(dentry); |
| 465 | out_dput: |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 466 | mutex_unlock(&xadir->d_inode->i_mutex); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 467 | dput(xadir); |
| 468 | return err; |
| 469 | } |
| 470 | |
Vladimir Saveliev | ba9d8ce | 2007-10-16 01:25:14 -0700 | [diff] [blame] | 471 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | /* Generic extended attribute operations that can be used by xa plugins */ |
| 473 | |
| 474 | /* |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 475 | * inode->i_mutex: down |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | */ |
| 477 | int |
Jeff Mahoney | 0ab2621 | 2009-03-30 14:02:39 -0400 | [diff] [blame] | 478 | reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, |
| 479 | struct inode *inode, const char *name, |
| 480 | const void *buffer, size_t buffer_size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 482 | int err = 0; |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 483 | struct dentry *dentry; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 484 | struct page *page; |
| 485 | char *data; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 486 | size_t file_pos = 0; |
| 487 | size_t buffer_pos = 0; |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 488 | size_t new_size; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 489 | __u32 xahash = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 491 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
| 492 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | |
Frederic Weisbecker | 3f14fea | 2009-12-30 07:03:53 +0100 | [diff] [blame] | 494 | reiserfs_write_unlock(inode->i_sb); |
Frederic Weisbecker | 4f3be1b | 2010-01-05 02:14:30 +0100 | [diff] [blame] | 495 | |
| 496 | if (!buffer) { |
| 497 | err = lookup_and_delete_xattr(inode, name); |
| 498 | reiserfs_write_lock(inode->i_sb); |
| 499 | return err; |
| 500 | } |
| 501 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 502 | dentry = xattr_lookup(inode, name, flags); |
Frederic Weisbecker | 3f14fea | 2009-12-30 07:03:53 +0100 | [diff] [blame] | 503 | if (IS_ERR(dentry)) { |
| 504 | reiserfs_write_lock(inode->i_sb); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 505 | return PTR_ERR(dentry); |
Frederic Weisbecker | 3f14fea | 2009-12-30 07:03:53 +0100 | [diff] [blame] | 506 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | |
Frederic Weisbecker | f3e22f4 | 2010-01-03 03:44:53 +0100 | [diff] [blame] | 508 | down_write(&REISERFS_I(inode)->i_xattr_sem); |
Frederic Weisbecker | 3f14fea | 2009-12-30 07:03:53 +0100 | [diff] [blame] | 509 | |
| 510 | reiserfs_write_lock(inode->i_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 512 | xahash = xattr_hash(buffer, buffer_size); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 513 | while (buffer_pos < buffer_size || buffer_pos == 0) { |
| 514 | size_t chunk; |
| 515 | size_t skip = 0; |
| 516 | size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1)); |
| 517 | if (buffer_size - buffer_pos > PAGE_CACHE_SIZE) |
| 518 | chunk = PAGE_CACHE_SIZE; |
| 519 | else |
| 520 | chunk = buffer_size - buffer_pos; |
| 521 | |
Jeff Mahoney | ec6ea56 | 2009-03-30 14:02:30 -0400 | [diff] [blame] | 522 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 523 | if (IS_ERR(page)) { |
| 524 | err = PTR_ERR(page); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 525 | goto out_unlock; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 526 | } |
| 527 | |
| 528 | lock_page(page); |
| 529 | data = page_address(page); |
| 530 | |
| 531 | if (file_pos == 0) { |
| 532 | struct reiserfs_xattr_header *rxh; |
| 533 | skip = file_pos = sizeof(struct reiserfs_xattr_header); |
| 534 | if (chunk + skip > PAGE_CACHE_SIZE) |
| 535 | chunk = PAGE_CACHE_SIZE - skip; |
| 536 | rxh = (struct reiserfs_xattr_header *)data; |
| 537 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); |
| 538 | rxh->h_hash = cpu_to_le32(xahash); |
| 539 | } |
| 540 | |
Christoph Hellwig | ebdec24 | 2010-10-06 10:47:23 +0200 | [diff] [blame] | 541 | err = __reiserfs_write_begin(page, page_offset, chunk + skip); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 542 | if (!err) { |
| 543 | if (buffer) |
| 544 | memcpy(data + skip, buffer + buffer_pos, chunk); |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 545 | err = reiserfs_commit_write(NULL, page, page_offset, |
| 546 | page_offset + chunk + |
| 547 | skip); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 548 | } |
| 549 | unlock_page(page); |
| 550 | reiserfs_put_page(page); |
| 551 | buffer_pos += chunk; |
| 552 | file_pos += chunk; |
| 553 | skip = 0; |
| 554 | if (err || buffer_size == 0 || !buffer) |
| 555 | break; |
| 556 | } |
| 557 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 558 | new_size = buffer_size + sizeof(struct reiserfs_xattr_header); |
| 559 | if (!err && new_size < i_size_read(dentry->d_inode)) { |
| 560 | struct iattr newattrs = { |
| 561 | .ia_ctime = current_fs_time(inode->i_sb), |
Jeff Mahoney | fb2162d | 2010-04-23 13:17:41 -0400 | [diff] [blame] | 562 | .ia_size = new_size, |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 563 | .ia_valid = ATTR_SIZE | ATTR_CTIME, |
| 564 | }; |
Frederic Weisbecker | 31370f6 | 2010-01-07 15:55:31 +0100 | [diff] [blame] | 565 | |
| 566 | reiserfs_write_unlock(inode->i_sb); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 567 | mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR); |
Christoph Hellwig | bd5fe6c | 2011-06-24 14:29:43 -0400 | [diff] [blame] | 568 | inode_dio_wait(dentry->d_inode); |
Frederic Weisbecker | 31370f6 | 2010-01-07 15:55:31 +0100 | [diff] [blame] | 569 | reiserfs_write_lock(inode->i_sb); |
| 570 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 571 | err = reiserfs_setattr(dentry, &newattrs); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 572 | mutex_unlock(&dentry->d_inode->i_mutex); |
| 573 | } else |
| 574 | update_ctime(inode); |
| 575 | out_unlock: |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 576 | up_write(&REISERFS_I(inode)->i_xattr_sem); |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 577 | dput(dentry); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 578 | return err; |
| 579 | } |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 580 | |
Jeff Mahoney | 0ab2621 | 2009-03-30 14:02:39 -0400 | [diff] [blame] | 581 | /* We need to start a transaction to maintain lock ordering */ |
| 582 | int reiserfs_xattr_set(struct inode *inode, const char *name, |
| 583 | const void *buffer, size_t buffer_size, int flags) |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 584 | { |
Jeff Mahoney | 0ab2621 | 2009-03-30 14:02:39 -0400 | [diff] [blame] | 585 | |
| 586 | struct reiserfs_transaction_handle th; |
| 587 | int error, error2; |
| 588 | size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size); |
| 589 | |
| 590 | if (!(flags & XATTR_REPLACE)) |
| 591 | jbegin_count += reiserfs_xattr_jcreate_nblocks(inode); |
| 592 | |
| 593 | reiserfs_write_lock(inode->i_sb); |
| 594 | error = journal_begin(&th, inode->i_sb, jbegin_count); |
| 595 | if (error) { |
| 596 | reiserfs_write_unlock(inode->i_sb); |
| 597 | return error; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 598 | } |
| 599 | |
Jeff Mahoney | 0ab2621 | 2009-03-30 14:02:39 -0400 | [diff] [blame] | 600 | error = reiserfs_xattr_set_handle(&th, inode, name, |
| 601 | buffer, buffer_size, flags); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 602 | |
Jeff Mahoney | 0ab2621 | 2009-03-30 14:02:39 -0400 | [diff] [blame] | 603 | error2 = journal_end(&th, inode->i_sb, jbegin_count); |
| 604 | if (error == 0) |
| 605 | error = error2; |
| 606 | reiserfs_write_unlock(inode->i_sb); |
| 607 | |
| 608 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | } |
| 610 | |
| 611 | /* |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 612 | * inode->i_mutex: down |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | */ |
| 614 | int |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 615 | reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 616 | size_t buffer_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 618 | ssize_t err = 0; |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 619 | struct dentry *dentry; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 620 | size_t isize; |
| 621 | size_t file_pos = 0; |
| 622 | size_t buffer_pos = 0; |
| 623 | struct page *page; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 624 | __u32 hash = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 626 | if (name == NULL) |
| 627 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 629 | /* We can't have xattrs attached to v1 items since they don't have |
| 630 | * generation numbers */ |
| 631 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
| 632 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 634 | dentry = xattr_lookup(inode, name, XATTR_REPLACE); |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 635 | if (IS_ERR(dentry)) { |
| 636 | err = PTR_ERR(dentry); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 637 | goto out; |
| 638 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 640 | down_read(&REISERFS_I(inode)->i_xattr_sem); |
Jeff Mahoney | d984561 | 2009-03-30 14:02:35 -0400 | [diff] [blame] | 641 | |
Jeff Mahoney | f437c52 | 2009-03-30 14:02:29 -0400 | [diff] [blame] | 642 | isize = i_size_read(dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 644 | /* Just return the size needed */ |
| 645 | if (buffer == NULL) { |
| 646 | err = isize - sizeof(struct reiserfs_xattr_header); |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 647 | goto out_unlock; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 648 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 650 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { |
| 651 | err = -ERANGE; |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 652 | goto out_unlock; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 653 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 655 | while (file_pos < isize) { |
| 656 | size_t chunk; |
| 657 | char *data; |
| 658 | size_t skip = 0; |
| 659 | if (isize - file_pos > PAGE_CACHE_SIZE) |
| 660 | chunk = PAGE_CACHE_SIZE; |
| 661 | else |
| 662 | chunk = isize - file_pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | |
Jeff Mahoney | ec6ea56 | 2009-03-30 14:02:30 -0400 | [diff] [blame] | 664 | page = reiserfs_get_page(dentry->d_inode, file_pos); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 665 | if (IS_ERR(page)) { |
| 666 | err = PTR_ERR(page); |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 667 | goto out_unlock; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 668 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 670 | lock_page(page); |
| 671 | data = page_address(page); |
| 672 | if (file_pos == 0) { |
| 673 | struct reiserfs_xattr_header *rxh = |
| 674 | (struct reiserfs_xattr_header *)data; |
| 675 | skip = file_pos = sizeof(struct reiserfs_xattr_header); |
| 676 | chunk -= skip; |
| 677 | /* Magic doesn't match up.. */ |
| 678 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { |
| 679 | unlock_page(page); |
| 680 | reiserfs_put_page(page); |
Jeff Mahoney | 45b03d5 | 2009-03-30 14:02:21 -0400 | [diff] [blame] | 681 | reiserfs_warning(inode->i_sb, "jdm-20001", |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 682 | "Invalid magic for xattr (%s) " |
| 683 | "associated with %k", name, |
| 684 | INODE_PKEY(inode)); |
| 685 | err = -EIO; |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 686 | goto out_unlock; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 687 | } |
| 688 | hash = le32_to_cpu(rxh->h_hash); |
| 689 | } |
| 690 | memcpy(buffer + buffer_pos, data + skip, chunk); |
| 691 | unlock_page(page); |
| 692 | reiserfs_put_page(page); |
| 693 | file_pos += chunk; |
| 694 | buffer_pos += chunk; |
| 695 | skip = 0; |
| 696 | } |
| 697 | err = isize - sizeof(struct reiserfs_xattr_header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 699 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != |
| 700 | hash) { |
Jeff Mahoney | 45b03d5 | 2009-03-30 14:02:21 -0400 | [diff] [blame] | 701 | reiserfs_warning(inode->i_sb, "jdm-20002", |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 702 | "Invalid hash for xattr (%s) associated " |
| 703 | "with %k", name, INODE_PKEY(inode)); |
| 704 | err = -EIO; |
| 705 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 707 | out_unlock: |
| 708 | up_read(&REISERFS_I(inode)->i_xattr_sem); |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 709 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 711 | out: |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 712 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | } |
| 714 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 715 | /* |
| 716 | * In order to implement different sets of xattr operations for each xattr |
| 717 | * prefix with the generic xattr API, a filesystem should create a |
| 718 | * null-terminated array of struct xattr_handler (one for each prefix) and |
| 719 | * hang a pointer to it off of the s_xattr field of the superblock. |
| 720 | * |
| 721 | * The generic_fooxattr() functions will use this list to dispatch xattr |
| 722 | * operations to the correct xattr_handler. |
| 723 | */ |
| 724 | #define for_each_xattr_handler(handlers, handler) \ |
| 725 | for ((handler) = *(handlers)++; \ |
| 726 | (handler) != NULL; \ |
| 727 | (handler) = *(handlers)++) |
| 728 | |
| 729 | /* This is the implementation for the xattr plugin infrastructure */ |
Stephen Hemminger | 94d09a9 | 2010-05-13 17:53:19 -0700 | [diff] [blame] | 730 | static inline const struct xattr_handler * |
| 731 | find_xattr_handler_prefix(const struct xattr_handler **handlers, |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 732 | const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | { |
Stephen Hemminger | 94d09a9 | 2010-05-13 17:53:19 -0700 | [diff] [blame] | 734 | const struct xattr_handler *xah; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 736 | if (!handlers) |
| 737 | return NULL; |
| 738 | |
| 739 | for_each_xattr_handler(handlers, xah) { |
| 740 | if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0) |
| 741 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | } |
| 743 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 744 | return xah; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | } |
| 746 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | |
| 748 | /* |
| 749 | * Inode operation getxattr() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | */ |
| 751 | ssize_t |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 752 | reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, |
| 753 | size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | { |
Stephen Hemminger | 94d09a9 | 2010-05-13 17:53:19 -0700 | [diff] [blame] | 755 | const struct xattr_handler *handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 757 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 758 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 759 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 760 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 762 | return handler->get(dentry, name, buffer, size, handler->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | } |
| 764 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | /* |
| 766 | * Inode operation setxattr() |
| 767 | * |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 768 | * dentry->d_inode->i_mutex down |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | */ |
| 770 | int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 771 | reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
| 772 | size_t size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | { |
Stephen Hemminger | 94d09a9 | 2010-05-13 17:53:19 -0700 | [diff] [blame] | 774 | const struct xattr_handler *handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 776 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 777 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 778 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 779 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 781 | return handler->set(dentry, name, value, size, flags, handler->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | } |
| 783 | |
| 784 | /* |
| 785 | * Inode operation removexattr() |
| 786 | * |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 787 | * dentry->d_inode->i_mutex down |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 789 | int reiserfs_removexattr(struct dentry *dentry, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | { |
Stephen Hemminger | 94d09a9 | 2010-05-13 17:53:19 -0700 | [diff] [blame] | 791 | const struct xattr_handler *handler; |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 792 | handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 794 | if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 795 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 797 | return handler->set(dentry, name, NULL, 0, XATTR_REPLACE, handler->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | } |
| 799 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 800 | struct listxattr_buf { |
Al Viro | 4acf381 | 2013-05-17 22:42:17 -0400 | [diff] [blame] | 801 | struct dir_context ctx; |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 802 | size_t size; |
| 803 | size_t pos; |
| 804 | char *buf; |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 805 | struct dentry *dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | }; |
| 807 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 808 | static int listxattr_filler(void *buf, const char *name, int namelen, |
| 809 | loff_t offset, u64 ino, unsigned int d_type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | { |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 811 | struct listxattr_buf *b = (struct listxattr_buf *)buf; |
| 812 | size_t size; |
| 813 | if (name[0] != '.' || |
| 814 | (namelen != 1 && (name[1] != '.' || namelen != 2))) { |
Stephen Hemminger | 94d09a9 | 2010-05-13 17:53:19 -0700 | [diff] [blame] | 815 | const struct xattr_handler *handler; |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 816 | handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr, |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 817 | name); |
| 818 | if (!handler) /* Unsupported xattr name */ |
| 819 | return 0; |
| 820 | if (b->buf) { |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 821 | size = handler->list(b->dentry, b->buf + b->pos, |
| 822 | b->size, name, namelen, |
| 823 | handler->flags); |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 824 | if (size > b->size) |
| 825 | return -ERANGE; |
| 826 | } else { |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 827 | size = handler->list(b->dentry, NULL, 0, name, |
| 828 | namelen, handler->flags); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 829 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 831 | b->pos += size; |
| 832 | } |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 833 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | } |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 835 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | /* |
| 837 | * Inode operation listxattr() |
| 838 | * |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 839 | * We totally ignore the generic listxattr here because it would be stupid |
| 840 | * not to. Since the xattrs are organized in a directory, we can just |
| 841 | * readdir to find them. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 843 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 845 | struct dentry *dir; |
| 846 | int err = 0; |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 847 | struct listxattr_buf buf = { |
Al Viro | 4acf381 | 2013-05-17 22:42:17 -0400 | [diff] [blame] | 848 | .ctx.actor = listxattr_filler, |
Christoph Hellwig | 431547b | 2009-11-13 09:52:56 +0000 | [diff] [blame] | 849 | .dentry = dentry, |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 850 | .buf = buffer, |
| 851 | .size = buffer ? size : 0, |
| 852 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 854 | if (!dentry->d_inode) |
| 855 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | |
Jeff Mahoney | 677c9b2 | 2009-05-05 15:30:17 -0400 | [diff] [blame] | 857 | if (!dentry->d_sb->s_xattr || |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 858 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
| 859 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 861 | dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 862 | if (IS_ERR(dir)) { |
| 863 | err = PTR_ERR(dir); |
| 864 | if (err == -ENODATA) |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 865 | err = 0; /* Not an error if there aren't any xattrs */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 866 | goto out; |
| 867 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 869 | mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
Al Viro | cd62cda | 2013-05-17 22:58:58 -0400 | [diff] [blame] | 870 | err = reiserfs_readdir_inode(dir->d_inode, &buf.ctx); |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 871 | mutex_unlock(&dir->d_inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 873 | if (!err) |
| 874 | err = buf.pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | |
Jeff Mahoney | 3227e14 | 2008-02-15 14:37:22 -0800 | [diff] [blame] | 876 | dput(dir); |
Jeff Mahoney | 8b6dd72 | 2009-03-30 14:02:36 -0400 | [diff] [blame] | 877 | out: |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 878 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | } |
| 880 | |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 881 | static int create_privroot(struct dentry *dentry) |
| 882 | { |
| 883 | int err; |
| 884 | struct inode *inode = dentry->d_parent->d_inode; |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 885 | WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex)); |
| 886 | |
Jeff Mahoney | 6c17675 | 2009-03-30 14:02:34 -0400 | [diff] [blame] | 887 | err = xattr_mkdir(inode, dentry, 0700); |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 888 | if (err || !dentry->d_inode) { |
| 889 | reiserfs_warning(dentry->d_sb, "jdm-20006", |
| 890 | "xattrs/ACLs enabled and couldn't " |
| 891 | "find/create .reiserfs_priv. " |
| 892 | "Failing mount."); |
| 893 | return -EOPNOTSUPP; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 894 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 896 | dentry->d_inode->i_flags |= S_PRIVATE; |
| 897 | reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr " |
| 898 | "storage.\n", PRIVROOT_NAME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 900 | return 0; |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 901 | } |
| 902 | |
Jeff Mahoney | 12abb35 | 2009-05-17 01:02:01 -0400 | [diff] [blame] | 903 | #else |
| 904 | int __init reiserfs_xattr_register_handlers(void) { return 0; } |
| 905 | void reiserfs_xattr_unregister_handlers(void) {} |
| 906 | static int create_privroot(struct dentry *dentry) { return 0; } |
| 907 | #endif |
| 908 | |
| 909 | /* Actual operations that are exported to VFS-land */ |
Sachin Kamat | da02eb7 | 2012-08-23 17:28:57 +0200 | [diff] [blame] | 910 | static const struct xattr_handler *reiserfs_xattr_handlers[] = { |
Jeff Mahoney | 12abb35 | 2009-05-17 01:02:01 -0400 | [diff] [blame] | 911 | #ifdef CONFIG_REISERFS_FS_XATTR |
| 912 | &reiserfs_xattr_user_handler, |
| 913 | &reiserfs_xattr_trusted_handler, |
| 914 | #endif |
| 915 | #ifdef CONFIG_REISERFS_FS_SECURITY |
| 916 | &reiserfs_xattr_security_handler, |
| 917 | #endif |
| 918 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL |
| 919 | &reiserfs_posix_acl_access_handler, |
| 920 | &reiserfs_posix_acl_default_handler, |
| 921 | #endif |
| 922 | NULL |
| 923 | }; |
| 924 | |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 925 | static int xattr_mount_check(struct super_block *s) |
| 926 | { |
| 927 | /* We need generation numbers to ensure that the oid mapping is correct |
| 928 | * v3.5 filesystems don't have them. */ |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 929 | if (old_format_only(s)) { |
| 930 | if (reiserfs_xattrs_optional(s)) { |
| 931 | /* Old format filesystem, but optional xattrs have |
| 932 | * been enabled. Error out. */ |
| 933 | reiserfs_warning(s, "jdm-2005", |
| 934 | "xattrs/ACLs not supported " |
| 935 | "on pre-v3.6 format filesystems. " |
| 936 | "Failing mount."); |
| 937 | return -EOPNOTSUPP; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 938 | } |
| 939 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 941 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | } |
| 943 | |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 944 | int reiserfs_permission(struct inode *inode, int mask) |
Jeff Mahoney | b83674c | 2009-05-17 01:02:03 -0400 | [diff] [blame] | 945 | { |
| 946 | /* |
| 947 | * We don't do permission checks on the internal objects. |
| 948 | * Permissions are determined by the "owning" object. |
| 949 | */ |
| 950 | if (IS_PRIVATE(inode)) |
| 951 | return 0; |
| 952 | |
Al Viro | 2830ba7 | 2011-06-20 19:16:29 -0400 | [diff] [blame] | 953 | return generic_permission(inode, mask); |
Jeff Mahoney | b83674c | 2009-05-17 01:02:03 -0400 | [diff] [blame] | 954 | } |
| 955 | |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 956 | static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | { |
Jeff Mahoney | cac36f7 | 2010-04-23 13:17:37 -0400 | [diff] [blame] | 958 | return -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | } |
| 960 | |
Al Viro | e16404e | 2009-02-20 05:55:13 +0000 | [diff] [blame] | 961 | static const struct dentry_operations xattr_lookup_poison_ops = { |
Jeff Mahoney | cac36f7 | 2010-04-23 13:17:37 -0400 | [diff] [blame] | 962 | .d_revalidate = xattr_hide_revalidate, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | }; |
| 964 | |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 965 | int reiserfs_lookup_privroot(struct super_block *s) |
| 966 | { |
| 967 | struct dentry *dentry; |
| 968 | int err = 0; |
| 969 | |
| 970 | /* If we don't have the privroot located yet - go find it */ |
Frederic Weisbecker | c72e057 | 2009-05-16 18:12:08 +0200 | [diff] [blame] | 971 | reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s); |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 972 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, |
| 973 | strlen(PRIVROOT_NAME)); |
| 974 | if (!IS_ERR(dentry)) { |
| 975 | REISERFS_SB(s)->priv_root = dentry; |
Nick Piggin | fb045ad | 2011-01-07 17:49:55 +1100 | [diff] [blame] | 976 | d_set_d_op(dentry, &xattr_lookup_poison_ops); |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 977 | if (dentry->d_inode) |
| 978 | dentry->d_inode->i_flags |= S_PRIVATE; |
| 979 | } else |
| 980 | err = PTR_ERR(dentry); |
| 981 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
| 982 | |
| 983 | return err; |
| 984 | } |
| 985 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | /* We need to take a copy of the mount flags since things like |
| 987 | * MS_RDONLY don't get set until *after* we're called. |
| 988 | * mount_flags != mount_options */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 989 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 991 | int err = 0; |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 992 | struct dentry *privroot = REISERFS_SB(s)->priv_root; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 994 | err = xattr_mount_check(s); |
| 995 | if (err) |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 996 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 998 | if (!privroot->d_inode && !(mount_flags & MS_RDONLY)) { |
Frederic Weisbecker | ae635c0 | 2009-08-25 02:24:45 +0200 | [diff] [blame] | 999 | reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s); |
Al Viro | edcc37a | 2009-05-03 06:00:05 -0400 | [diff] [blame] | 1000 | err = create_privroot(REISERFS_SB(s)->priv_root); |
Jeff Mahoney | 5a6059c | 2009-05-01 12:11:12 -0400 | [diff] [blame] | 1001 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1002 | } |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 1003 | |
| 1004 | if (privroot->d_inode) { |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 1005 | s->s_xattr = reiserfs_xattr_handlers; |
Frederic Weisbecker | c72e057 | 2009-05-16 18:12:08 +0200 | [diff] [blame] | 1006 | reiserfs_mutex_lock_safe(&privroot->d_inode->i_mutex, s); |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 1007 | if (!REISERFS_SB(s)->xattr_root) { |
| 1008 | struct dentry *dentry; |
| 1009 | dentry = lookup_one_len(XAROOT_NAME, privroot, |
| 1010 | strlen(XAROOT_NAME)); |
| 1011 | if (!IS_ERR(dentry)) |
| 1012 | REISERFS_SB(s)->xattr_root = dentry; |
| 1013 | else |
| 1014 | err = PTR_ERR(dentry); |
| 1015 | } |
| 1016 | mutex_unlock(&privroot->d_inode->i_mutex); |
| 1017 | } |
Jeff Mahoney | 48b32a3 | 2009-03-30 14:02:38 -0400 | [diff] [blame] | 1018 | |
Jeff Mahoney | a72bdb1 | 2009-03-30 14:02:33 -0400 | [diff] [blame] | 1019 | error: |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1020 | if (err) { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1021 | clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt)); |
| 1022 | clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt)); |
| 1023 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1025 | /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1026 | if (reiserfs_posixacl(s)) |
| 1027 | s->s_flags |= MS_POSIXACL; |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 1028 | else |
Jeff Mahoney | ab17c4f | 2009-05-05 15:30:15 -0400 | [diff] [blame] | 1029 | s->s_flags &= ~MS_POSIXACL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1031 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | } |