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. |
| 30 | */ |
| 31 | |
| 32 | #include <linux/reiserfs_fs.h> |
| 33 | #include <linux/dcache.h> |
| 34 | #include <linux/namei.h> |
| 35 | #include <linux/errno.h> |
| 36 | #include <linux/fs.h> |
| 37 | #include <linux/file.h> |
| 38 | #include <linux/pagemap.h> |
| 39 | #include <linux/xattr.h> |
| 40 | #include <linux/reiserfs_xattr.h> |
| 41 | #include <linux/reiserfs_acl.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #include <asm/uaccess.h> |
| 43 | #include <asm/checksum.h> |
| 44 | #include <linux/smp_lock.h> |
| 45 | #include <linux/stat.h> |
| 46 | #include <asm/semaphore.h> |
| 47 | |
| 48 | #define FL_READONLY 128 |
| 49 | #define FL_DIR_SEM_HELD 256 |
| 50 | #define PRIVROOT_NAME ".reiserfs_priv" |
| 51 | #define XAROOT_NAME "xattrs" |
| 52 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 53 | static struct reiserfs_xattr_handler *find_xattr_handler_prefix(const char |
| 54 | *prefix); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 56 | static struct dentry *create_xa_root(struct super_block *sb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 58 | struct dentry *privroot = dget(REISERFS_SB(sb)->priv_root); |
| 59 | struct dentry *xaroot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 61 | /* This needs to be created at mount-time */ |
| 62 | if (!privroot) |
| 63 | return ERR_PTR(-EOPNOTSUPP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 65 | xaroot = lookup_one_len(XAROOT_NAME, privroot, strlen(XAROOT_NAME)); |
| 66 | if (IS_ERR(xaroot)) { |
| 67 | goto out; |
| 68 | } else if (!xaroot->d_inode) { |
| 69 | int err; |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 70 | mutex_lock(&privroot->d_inode->i_mutex); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 71 | err = |
| 72 | privroot->d_inode->i_op->mkdir(privroot->d_inode, xaroot, |
| 73 | 0700); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 74 | mutex_unlock(&privroot->d_inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 76 | if (err) { |
| 77 | dput(xaroot); |
| 78 | dput(privroot); |
| 79 | return ERR_PTR(err); |
| 80 | } |
| 81 | REISERFS_SB(sb)->xattr_root = dget(xaroot); |
| 82 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 84 | out: |
| 85 | dput(privroot); |
| 86 | return xaroot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | } |
| 88 | |
| 89 | /* This will return a dentry, or error, refering to the xa root directory. |
| 90 | * If the xa root doesn't exist yet, the dentry will be returned without |
| 91 | * an associated inode. This dentry can be used with ->mkdir to create |
| 92 | * the xa directory. */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 93 | static struct dentry *__get_xa_root(struct super_block *s) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 95 | struct dentry *privroot = dget(REISERFS_SB(s)->priv_root); |
| 96 | struct dentry *xaroot = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 98 | if (IS_ERR(privroot) || !privroot) |
| 99 | return privroot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 101 | xaroot = lookup_one_len(XAROOT_NAME, privroot, strlen(XAROOT_NAME)); |
| 102 | if (IS_ERR(xaroot)) { |
| 103 | goto out; |
| 104 | } else if (!xaroot->d_inode) { |
| 105 | dput(xaroot); |
| 106 | xaroot = NULL; |
| 107 | goto out; |
| 108 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 110 | REISERFS_SB(s)->xattr_root = dget(xaroot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 112 | out: |
| 113 | dput(privroot); |
| 114 | return xaroot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | } |
| 116 | |
| 117 | /* Returns the dentry (or NULL) referring to the root of the extended |
Matt Mackall | 4a4efbd | 2006-01-03 13:27:11 +0100 | [diff] [blame] | 118 | * attribute directory tree. If it has already been retrieved, it is used. |
| 119 | * Otherwise, we attempt to retrieve it from disk. It may also return |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | * a pointer-encoded error. |
| 121 | */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 122 | static inline struct dentry *get_xa_root(struct super_block *s) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 124 | struct dentry *dentry = dget(REISERFS_SB(s)->xattr_root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 126 | if (!dentry) |
| 127 | dentry = __get_xa_root(s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 129 | return dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | /* Opens the directory corresponding to the inode's extended attribute store. |
| 133 | * If flags allow, the tree to the directory may be created. If creation is |
| 134 | * prohibited, -ENODATA is returned. */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 135 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 137 | struct dentry *xaroot, *xadir; |
| 138 | char namebuf[17]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 140 | xaroot = get_xa_root(inode->i_sb); |
| 141 | if (IS_ERR(xaroot)) { |
| 142 | return xaroot; |
| 143 | } else if (!xaroot) { |
| 144 | if (flags == 0 || flags & XATTR_CREATE) { |
| 145 | xaroot = create_xa_root(inode->i_sb); |
| 146 | if (IS_ERR(xaroot)) |
| 147 | return xaroot; |
| 148 | } |
| 149 | if (!xaroot) |
| 150 | return ERR_PTR(-ENODATA); |
| 151 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 153 | /* ok, we have xaroot open */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 155 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
| 156 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), |
| 157 | inode->i_generation); |
| 158 | xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf)); |
| 159 | if (IS_ERR(xadir)) { |
| 160 | dput(xaroot); |
| 161 | return xadir; |
| 162 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 164 | if (!xadir->d_inode) { |
| 165 | int err; |
| 166 | if (flags == 0 || flags & XATTR_CREATE) { |
| 167 | /* Although there is nothing else trying to create this directory, |
| 168 | * another directory with the same hash may be created, so we need |
| 169 | * to protect against that */ |
| 170 | err = |
| 171 | xaroot->d_inode->i_op->mkdir(xaroot->d_inode, xadir, |
| 172 | 0700); |
| 173 | if (err) { |
| 174 | dput(xaroot); |
| 175 | dput(xadir); |
| 176 | return ERR_PTR(err); |
| 177 | } |
| 178 | } |
| 179 | if (!xadir->d_inode) { |
| 180 | dput(xaroot); |
| 181 | dput(xadir); |
| 182 | return ERR_PTR(-ENODATA); |
| 183 | } |
| 184 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 186 | dput(xaroot); |
| 187 | return xadir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | } |
| 189 | |
| 190 | /* Returns a dentry corresponding to a specific extended attribute file |
| 191 | * for the inode. If flags allow, the file is created. Otherwise, a |
| 192 | * valid or negative dentry, or an error is returned. */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 193 | static struct dentry *get_xa_file_dentry(const struct inode *inode, |
| 194 | const char *name, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 196 | struct dentry *xadir, *xafile; |
| 197 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 199 | xadir = open_xa_dir(inode, flags); |
| 200 | if (IS_ERR(xadir)) { |
| 201 | return ERR_PTR(PTR_ERR(xadir)); |
| 202 | } else if (xadir && !xadir->d_inode) { |
| 203 | dput(xadir); |
| 204 | return ERR_PTR(-ENODATA); |
| 205 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 207 | xafile = lookup_one_len(name, xadir, strlen(name)); |
| 208 | if (IS_ERR(xafile)) { |
| 209 | dput(xadir); |
| 210 | return ERR_PTR(PTR_ERR(xafile)); |
| 211 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 213 | if (xafile->d_inode) { /* file exists */ |
| 214 | if (flags & XATTR_CREATE) { |
| 215 | err = -EEXIST; |
| 216 | dput(xafile); |
| 217 | goto out; |
| 218 | } |
| 219 | } else if (flags & XATTR_REPLACE || flags & FL_READONLY) { |
| 220 | goto out; |
| 221 | } else { |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 222 | /* inode->i_mutex is down, so nothing else can try to create |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 223 | * the same xattr */ |
| 224 | err = xadir->d_inode->i_op->create(xadir->d_inode, xafile, |
| 225 | 0700 | S_IFREG, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 227 | if (err) { |
| 228 | dput(xafile); |
| 229 | goto out; |
| 230 | } |
| 231 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 233 | out: |
| 234 | dput(xadir); |
| 235 | if (err) |
| 236 | xafile = ERR_PTR(err); |
| 237 | return xafile; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | } |
| 239 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | /* Opens a file pointer to the attribute associated with inode */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 241 | static struct file *open_xa_file(const struct inode *inode, const char *name, |
| 242 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 244 | struct dentry *xafile; |
| 245 | struct file *fp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 247 | xafile = get_xa_file_dentry(inode, name, flags); |
| 248 | if (IS_ERR(xafile)) |
| 249 | return ERR_PTR(PTR_ERR(xafile)); |
| 250 | else if (!xafile->d_inode) { |
| 251 | dput(xafile); |
| 252 | return ERR_PTR(-ENODATA); |
| 253 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 255 | fp = dentry_open(xafile, NULL, O_RDWR); |
| 256 | /* dentry_open dputs the dentry if it fails */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 258 | return fp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | } |
| 260 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | /* |
| 262 | * this is very similar to fs/reiserfs/dir.c:reiserfs_readdir, but |
| 263 | * we need to drop the path before calling the filldir struct. That |
| 264 | * would be a big performance hit to the non-xattr case, so I've copied |
| 265 | * the whole thing for now. --clm |
| 266 | * |
| 267 | * the big difference is that I go backwards through the directory, |
| 268 | * and don't mess with f->f_pos, but the idea is the same. Do some |
| 269 | * action on each and every entry in the directory. |
| 270 | * |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 271 | * we're called with i_mutex held, so there are no worries about the directory |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | * changing underneath us. |
| 273 | */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 274 | static int __xattr_readdir(struct file *filp, void *dirent, filldir_t filldir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 276 | struct inode *inode = filp->f_dentry->d_inode; |
| 277 | struct cpu_key pos_key; /* key of current position in the directory (key of directory entry) */ |
| 278 | INITIALIZE_PATH(path_to_entry); |
| 279 | struct buffer_head *bh; |
| 280 | int entry_num; |
| 281 | struct item_head *ih, tmp_ih; |
| 282 | int search_res; |
| 283 | char *local_buf; |
| 284 | loff_t next_pos; |
| 285 | char small_buf[32]; /* avoid kmalloc if we can */ |
| 286 | struct reiserfs_de_head *deh; |
| 287 | int d_reclen; |
| 288 | char *d_name; |
| 289 | off_t d_off; |
| 290 | ino_t d_ino; |
| 291 | struct reiserfs_dir_entry de; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 293 | /* form key for search the next directory entry using f_pos field of |
| 294 | file structure */ |
| 295 | next_pos = max_reiserfs_offset(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 297 | while (1) { |
| 298 | research: |
| 299 | if (next_pos <= DOT_DOT_OFFSET) |
| 300 | break; |
| 301 | make_cpu_key(&pos_key, inode, next_pos, TYPE_DIRENTRY, 3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 303 | search_res = |
| 304 | search_by_entry_key(inode->i_sb, &pos_key, &path_to_entry, |
| 305 | &de); |
| 306 | if (search_res == IO_ERROR) { |
| 307 | // FIXME: we could just skip part of directory which could |
| 308 | // not be read |
| 309 | pathrelse(&path_to_entry); |
| 310 | return -EIO; |
| 311 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 313 | if (search_res == NAME_NOT_FOUND) |
| 314 | de.de_entry_num--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 316 | set_de_name_and_namelen(&de); |
| 317 | entry_num = de.de_entry_num; |
| 318 | deh = &(de.de_deh[entry_num]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 320 | bh = de.de_bh; |
| 321 | ih = de.de_ih; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 323 | if (!is_direntry_le_ih(ih)) { |
| 324 | reiserfs_warning(inode->i_sb, "not direntry %h", ih); |
| 325 | break; |
| 326 | } |
| 327 | copy_item_head(&tmp_ih, ih); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 329 | /* we must have found item, that is item of this directory, */ |
| 330 | RFALSE(COMP_SHORT_KEYS(&(ih->ih_key), &pos_key), |
| 331 | "vs-9000: found item %h does not match to dir we readdir %K", |
| 332 | ih, &pos_key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 334 | if (deh_offset(deh) <= DOT_DOT_OFFSET) { |
| 335 | break; |
| 336 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 338 | /* look for the previous entry in the directory */ |
| 339 | next_pos = deh_offset(deh) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 341 | if (!de_visible(deh)) |
| 342 | /* it is hidden entry */ |
| 343 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 345 | d_reclen = entry_length(bh, ih, entry_num); |
| 346 | d_name = B_I_DEH_ENTRY_FILE_NAME(bh, ih, deh); |
| 347 | d_off = deh_offset(deh); |
| 348 | d_ino = deh_objectid(deh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 350 | if (!d_name[d_reclen - 1]) |
| 351 | d_reclen = strlen(d_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 353 | if (d_reclen > REISERFS_MAX_NAME(inode->i_sb->s_blocksize)) { |
| 354 | /* too big to send back to VFS */ |
| 355 | continue; |
| 356 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 358 | /* Ignore the .reiserfs_priv entry */ |
| 359 | if (reiserfs_xattrs(inode->i_sb) && |
| 360 | !old_format_only(inode->i_sb) && |
| 361 | deh_objectid(deh) == |
| 362 | le32_to_cpu(INODE_PKEY |
| 363 | (REISERFS_SB(inode->i_sb)->priv_root->d_inode)-> |
| 364 | k_objectid)) |
| 365 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 367 | if (d_reclen <= 32) { |
| 368 | local_buf = small_buf; |
| 369 | } else { |
| 370 | local_buf = |
| 371 | reiserfs_kmalloc(d_reclen, GFP_NOFS, inode->i_sb); |
| 372 | if (!local_buf) { |
| 373 | pathrelse(&path_to_entry); |
| 374 | return -ENOMEM; |
| 375 | } |
| 376 | if (item_moved(&tmp_ih, &path_to_entry)) { |
| 377 | reiserfs_kfree(local_buf, d_reclen, |
| 378 | inode->i_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 380 | /* sigh, must retry. Do this same offset again */ |
| 381 | next_pos = d_off; |
| 382 | goto research; |
| 383 | } |
| 384 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 386 | // Note, that we copy name to user space via temporary |
| 387 | // buffer (local_buf) because filldir will block if |
| 388 | // user space buffer is swapped out. At that time |
| 389 | // entry can move to somewhere else |
| 390 | memcpy(local_buf, d_name, d_reclen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 392 | /* the filldir function might need to start transactions, |
| 393 | * or do who knows what. Release the path now that we've |
| 394 | * copied all the important stuff out of the deh |
| 395 | */ |
| 396 | pathrelse(&path_to_entry); |
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 | if (filldir(dirent, local_buf, d_reclen, d_off, d_ino, |
| 399 | DT_UNKNOWN) < 0) { |
| 400 | if (local_buf != small_buf) { |
| 401 | reiserfs_kfree(local_buf, d_reclen, |
| 402 | inode->i_sb); |
| 403 | } |
| 404 | goto end; |
| 405 | } |
| 406 | if (local_buf != small_buf) { |
| 407 | reiserfs_kfree(local_buf, d_reclen, inode->i_sb); |
| 408 | } |
| 409 | } /* while */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 411 | end: |
| 412 | pathrelse(&path_to_entry); |
| 413 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | } |
| 415 | |
| 416 | /* |
| 417 | * this could be done with dedicated readdir ops for the xattr files, |
| 418 | * but I want to get something working asap |
| 419 | * this is stolen from vfs_readdir |
| 420 | * |
| 421 | */ |
| 422 | static |
| 423 | int xattr_readdir(struct file *file, filldir_t filler, void *buf) |
| 424 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 425 | struct inode *inode = file->f_dentry->d_inode; |
| 426 | int res = -ENOTDIR; |
| 427 | if (!file->f_op || !file->f_op->readdir) |
| 428 | goto out; |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 429 | mutex_lock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | // down(&inode->i_zombie); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 431 | res = -ENOENT; |
| 432 | if (!IS_DEADDIR(inode)) { |
| 433 | lock_kernel(); |
| 434 | res = __xattr_readdir(file, buf, filler); |
| 435 | unlock_kernel(); |
| 436 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | // up(&inode->i_zombie); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 438 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 439 | out: |
| 440 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | } |
| 442 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | /* Internal operations on file data */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 444 | static inline void reiserfs_put_page(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 446 | kunmap(page); |
| 447 | page_cache_release(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | } |
| 449 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 450 | static struct page *reiserfs_get_page(struct inode *dir, unsigned long n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 452 | struct address_space *mapping = dir->i_mapping; |
| 453 | struct page *page; |
| 454 | /* We can deadlock if we try to free dentries, |
| 455 | and an unlink/rmdir has just occured - GFP_NOFS avoids this */ |
Al Viro | c4cdd03 | 2005-10-21 03:22:39 -0400 | [diff] [blame] | 456 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 457 | page = read_cache_page(mapping, n, |
| 458 | (filler_t *) mapping->a_ops->readpage, NULL); |
| 459 | if (!IS_ERR(page)) { |
| 460 | wait_on_page_locked(page); |
| 461 | kmap(page); |
| 462 | if (!PageUptodate(page)) |
| 463 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 465 | if (PageError(page)) |
| 466 | goto fail; |
| 467 | } |
| 468 | return page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 470 | fail: |
| 471 | reiserfs_put_page(page); |
| 472 | return ERR_PTR(-EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | } |
| 474 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 475 | static inline __u32 xattr_hash(const char *msg, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 477 | return csum_partial(msg, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | } |
| 479 | |
| 480 | /* Generic extended attribute operations that can be used by xa plugins */ |
| 481 | |
| 482 | /* |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 483 | * inode->i_mutex: down |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | */ |
| 485 | int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 486 | reiserfs_xattr_set(struct inode *inode, const char *name, const void *buffer, |
| 487 | size_t buffer_size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 489 | int err = 0; |
| 490 | struct file *fp; |
| 491 | struct page *page; |
| 492 | char *data; |
| 493 | struct address_space *mapping; |
| 494 | size_t file_pos = 0; |
| 495 | size_t buffer_pos = 0; |
| 496 | struct inode *xinode; |
| 497 | struct iattr newattrs; |
| 498 | __u32 xahash = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 500 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
| 501 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 503 | /* Empty xattrs are ok, they're just empty files, no hash */ |
| 504 | if (buffer && buffer_size) |
| 505 | xahash = xattr_hash(buffer, buffer_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 507 | open_file: |
| 508 | fp = open_xa_file(inode, name, flags); |
| 509 | if (IS_ERR(fp)) { |
| 510 | err = PTR_ERR(fp); |
| 511 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 514 | xinode = fp->f_dentry->d_inode; |
| 515 | REISERFS_I(inode)->i_flags |= i_has_xattr_dir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 517 | /* we need to copy it off.. */ |
| 518 | if (xinode->i_nlink > 1) { |
| 519 | fput(fp); |
| 520 | err = reiserfs_xattr_del(inode, name); |
| 521 | if (err < 0) |
| 522 | goto out; |
| 523 | /* We just killed the old one, we're not replacing anymore */ |
| 524 | if (flags & XATTR_REPLACE) |
| 525 | flags &= ~XATTR_REPLACE; |
| 526 | goto open_file; |
| 527 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 529 | /* Resize it so we're ok to write there */ |
| 530 | newattrs.ia_size = buffer_size; |
| 531 | newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME; |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 532 | mutex_lock(&xinode->i_mutex); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 533 | err = notify_change(fp->f_dentry, &newattrs); |
| 534 | if (err) |
| 535 | goto out_filp; |
| 536 | |
| 537 | mapping = xinode->i_mapping; |
| 538 | while (buffer_pos < buffer_size || buffer_pos == 0) { |
| 539 | size_t chunk; |
| 540 | size_t skip = 0; |
| 541 | size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1)); |
| 542 | if (buffer_size - buffer_pos > PAGE_CACHE_SIZE) |
| 543 | chunk = PAGE_CACHE_SIZE; |
| 544 | else |
| 545 | chunk = buffer_size - buffer_pos; |
| 546 | |
| 547 | page = reiserfs_get_page(xinode, file_pos >> PAGE_CACHE_SHIFT); |
| 548 | if (IS_ERR(page)) { |
| 549 | err = PTR_ERR(page); |
| 550 | goto out_filp; |
| 551 | } |
| 552 | |
| 553 | lock_page(page); |
| 554 | data = page_address(page); |
| 555 | |
| 556 | if (file_pos == 0) { |
| 557 | struct reiserfs_xattr_header *rxh; |
| 558 | skip = file_pos = sizeof(struct reiserfs_xattr_header); |
| 559 | if (chunk + skip > PAGE_CACHE_SIZE) |
| 560 | chunk = PAGE_CACHE_SIZE - skip; |
| 561 | rxh = (struct reiserfs_xattr_header *)data; |
| 562 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); |
| 563 | rxh->h_hash = cpu_to_le32(xahash); |
| 564 | } |
| 565 | |
| 566 | err = mapping->a_ops->prepare_write(fp, page, page_offset, |
| 567 | page_offset + chunk + skip); |
| 568 | if (!err) { |
| 569 | if (buffer) |
| 570 | memcpy(data + skip, buffer + buffer_pos, chunk); |
| 571 | err = |
| 572 | mapping->a_ops->commit_write(fp, page, page_offset, |
| 573 | page_offset + chunk + |
| 574 | skip); |
| 575 | } |
| 576 | unlock_page(page); |
| 577 | reiserfs_put_page(page); |
| 578 | buffer_pos += chunk; |
| 579 | file_pos += chunk; |
| 580 | skip = 0; |
| 581 | if (err || buffer_size == 0 || !buffer) |
| 582 | break; |
| 583 | } |
| 584 | |
| 585 | /* We can't mark the inode dirty if it's not hashed. This is the case |
| 586 | * when we're inheriting the default ACL. If we dirty it, the inode |
| 587 | * gets marked dirty, but won't (ever) make it onto the dirty list until |
| 588 | * it's synced explicitly to clear I_DIRTY. This is bad. */ |
| 589 | if (!hlist_unhashed(&inode->i_hash)) { |
| 590 | inode->i_ctime = CURRENT_TIME_SEC; |
| 591 | mark_inode_dirty(inode); |
| 592 | } |
| 593 | |
| 594 | out_filp: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 595 | mutex_unlock(&xinode->i_mutex); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 596 | fput(fp); |
| 597 | |
| 598 | out: |
| 599 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | } |
| 601 | |
| 602 | /* |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 603 | * inode->i_mutex: down |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | */ |
| 605 | int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 606 | reiserfs_xattr_get(const struct inode *inode, const char *name, void *buffer, |
| 607 | size_t buffer_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 609 | ssize_t err = 0; |
| 610 | struct file *fp; |
| 611 | size_t isize; |
| 612 | size_t file_pos = 0; |
| 613 | size_t buffer_pos = 0; |
| 614 | struct page *page; |
| 615 | struct inode *xinode; |
| 616 | __u32 hash = 0; |
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 | if (name == NULL) |
| 619 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 621 | /* We can't have xattrs attached to v1 items since they don't have |
| 622 | * generation numbers */ |
| 623 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
| 624 | return -EOPNOTSUPP; |
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 | fp = open_xa_file(inode, name, FL_READONLY); |
| 627 | if (IS_ERR(fp)) { |
| 628 | err = PTR_ERR(fp); |
| 629 | goto out; |
| 630 | } |
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 | xinode = fp->f_dentry->d_inode; |
| 633 | isize = xinode->i_size; |
| 634 | REISERFS_I(inode)->i_flags |= i_has_xattr_dir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 636 | /* Just return the size needed */ |
| 637 | if (buffer == NULL) { |
| 638 | err = isize - sizeof(struct reiserfs_xattr_header); |
| 639 | goto out_dput; |
| 640 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 642 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { |
| 643 | err = -ERANGE; |
| 644 | goto out_dput; |
| 645 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 647 | while (file_pos < isize) { |
| 648 | size_t chunk; |
| 649 | char *data; |
| 650 | size_t skip = 0; |
| 651 | if (isize - file_pos > PAGE_CACHE_SIZE) |
| 652 | chunk = PAGE_CACHE_SIZE; |
| 653 | else |
| 654 | chunk = isize - file_pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 656 | page = reiserfs_get_page(xinode, file_pos >> PAGE_CACHE_SHIFT); |
| 657 | if (IS_ERR(page)) { |
| 658 | err = PTR_ERR(page); |
| 659 | goto out_dput; |
| 660 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 662 | lock_page(page); |
| 663 | data = page_address(page); |
| 664 | if (file_pos == 0) { |
| 665 | struct reiserfs_xattr_header *rxh = |
| 666 | (struct reiserfs_xattr_header *)data; |
| 667 | skip = file_pos = sizeof(struct reiserfs_xattr_header); |
| 668 | chunk -= skip; |
| 669 | /* Magic doesn't match up.. */ |
| 670 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { |
| 671 | unlock_page(page); |
| 672 | reiserfs_put_page(page); |
| 673 | reiserfs_warning(inode->i_sb, |
| 674 | "Invalid magic for xattr (%s) " |
| 675 | "associated with %k", name, |
| 676 | INODE_PKEY(inode)); |
| 677 | err = -EIO; |
| 678 | goto out_dput; |
| 679 | } |
| 680 | hash = le32_to_cpu(rxh->h_hash); |
| 681 | } |
| 682 | memcpy(buffer + buffer_pos, data + skip, chunk); |
| 683 | unlock_page(page); |
| 684 | reiserfs_put_page(page); |
| 685 | file_pos += chunk; |
| 686 | buffer_pos += chunk; |
| 687 | skip = 0; |
| 688 | } |
| 689 | err = isize - sizeof(struct reiserfs_xattr_header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 691 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != |
| 692 | hash) { |
| 693 | reiserfs_warning(inode->i_sb, |
| 694 | "Invalid hash for xattr (%s) associated " |
| 695 | "with %k", name, INODE_PKEY(inode)); |
| 696 | err = -EIO; |
| 697 | } |
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 | out_dput: |
| 700 | fput(fp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 702 | out: |
| 703 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | } |
| 705 | |
| 706 | static int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 707 | __reiserfs_xattr_del(struct dentry *xadir, const char *name, int namelen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 709 | struct dentry *dentry; |
| 710 | struct inode *dir = xadir->d_inode; |
| 711 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 713 | dentry = lookup_one_len(name, xadir, namelen); |
| 714 | if (IS_ERR(dentry)) { |
| 715 | err = PTR_ERR(dentry); |
| 716 | goto out; |
| 717 | } else if (!dentry->d_inode) { |
| 718 | err = -ENODATA; |
| 719 | goto out_file; |
| 720 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 722 | /* Skip directories.. */ |
| 723 | if (S_ISDIR(dentry->d_inode->i_mode)) |
| 724 | goto out_file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 726 | if (!is_reiserfs_priv_object(dentry->d_inode)) { |
| 727 | reiserfs_warning(dir->i_sb, "OID %08x [%.*s/%.*s] doesn't have " |
| 728 | "priv flag set [parent is %sset].", |
| 729 | le32_to_cpu(INODE_PKEY(dentry->d_inode)-> |
| 730 | k_objectid), xadir->d_name.len, |
| 731 | xadir->d_name.name, namelen, name, |
| 732 | is_reiserfs_priv_object(xadir-> |
| 733 | d_inode) ? "" : |
| 734 | "not "); |
| 735 | dput(dentry); |
| 736 | return -EIO; |
| 737 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 739 | err = dir->i_op->unlink(dir, dentry); |
| 740 | if (!err) |
| 741 | d_delete(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 743 | out_file: |
| 744 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 746 | out: |
| 747 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | } |
| 749 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 750 | int reiserfs_xattr_del(struct inode *inode, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 752 | struct dentry *dir; |
| 753 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 755 | dir = open_xa_dir(inode, FL_READONLY); |
| 756 | if (IS_ERR(dir)) { |
| 757 | err = PTR_ERR(dir); |
| 758 | goto out; |
| 759 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 761 | err = __reiserfs_xattr_del(dir, name, strlen(name)); |
| 762 | dput(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 764 | if (!err) { |
| 765 | inode->i_ctime = CURRENT_TIME_SEC; |
| 766 | mark_inode_dirty(inode); |
| 767 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 769 | out: |
| 770 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | } |
| 772 | |
| 773 | /* The following are side effects of other operations that aren't explicitly |
| 774 | * modifying extended attributes. This includes operations such as permissions |
| 775 | * or ownership changes, object deletions, etc. */ |
| 776 | |
| 777 | static int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 778 | reiserfs_delete_xattrs_filler(void *buf, const char *name, int namelen, |
| 779 | loff_t offset, ino_t ino, unsigned int d_type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 781 | struct dentry *xadir = (struct dentry *)buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 783 | return __reiserfs_xattr_del(xadir, name, namelen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | |
| 785 | } |
| 786 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 787 | /* This is called w/ inode->i_mutex downed */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 788 | int reiserfs_delete_xattrs(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 790 | struct file *fp; |
| 791 | struct dentry *dir, *root; |
| 792 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 794 | /* Skip out, an xattr has no xattrs associated with it */ |
| 795 | if (is_reiserfs_priv_object(inode) || |
| 796 | get_inode_sd_version(inode) == STAT_DATA_V1 || |
| 797 | !reiserfs_xattrs(inode->i_sb)) { |
| 798 | return 0; |
| 799 | } |
| 800 | reiserfs_read_lock_xattrs(inode->i_sb); |
| 801 | dir = open_xa_dir(inode, FL_READONLY); |
| 802 | reiserfs_read_unlock_xattrs(inode->i_sb); |
| 803 | if (IS_ERR(dir)) { |
| 804 | err = PTR_ERR(dir); |
| 805 | goto out; |
| 806 | } else if (!dir->d_inode) { |
| 807 | dput(dir); |
| 808 | return 0; |
| 809 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 811 | fp = dentry_open(dir, NULL, O_RDWR); |
| 812 | if (IS_ERR(fp)) { |
| 813 | err = PTR_ERR(fp); |
| 814 | /* dentry_open dputs the dentry if it fails */ |
| 815 | goto out; |
| 816 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 818 | lock_kernel(); |
| 819 | err = xattr_readdir(fp, reiserfs_delete_xattrs_filler, dir); |
| 820 | if (err) { |
| 821 | unlock_kernel(); |
| 822 | goto out_dir; |
| 823 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 825 | /* Leftovers besides . and .. -- that's not good. */ |
| 826 | if (dir->d_inode->i_nlink <= 2) { |
| 827 | root = get_xa_root(inode->i_sb); |
| 828 | reiserfs_write_lock_xattrs(inode->i_sb); |
| 829 | err = vfs_rmdir(root->d_inode, dir); |
| 830 | reiserfs_write_unlock_xattrs(inode->i_sb); |
| 831 | dput(root); |
| 832 | } else { |
| 833 | reiserfs_warning(inode->i_sb, |
| 834 | "Couldn't remove all entries in directory"); |
| 835 | } |
| 836 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 838 | out_dir: |
| 839 | fput(fp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 841 | out: |
| 842 | if (!err) |
| 843 | REISERFS_I(inode)->i_flags = |
| 844 | REISERFS_I(inode)->i_flags & ~i_has_xattr_dir; |
| 845 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | } |
| 847 | |
| 848 | struct reiserfs_chown_buf { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 849 | struct inode *inode; |
| 850 | struct dentry *xadir; |
| 851 | struct iattr *attrs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | }; |
| 853 | |
| 854 | /* XXX: If there is a better way to do this, I'd love to hear about it */ |
| 855 | static int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 856 | reiserfs_chown_xattrs_filler(void *buf, const char *name, int namelen, |
| 857 | loff_t offset, ino_t ino, unsigned int d_type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 859 | struct reiserfs_chown_buf *chown_buf = (struct reiserfs_chown_buf *)buf; |
| 860 | struct dentry *xafile, *xadir = chown_buf->xadir; |
| 861 | struct iattr *attrs = chown_buf->attrs; |
| 862 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 864 | xafile = lookup_one_len(name, xadir, namelen); |
| 865 | if (IS_ERR(xafile)) |
| 866 | return PTR_ERR(xafile); |
| 867 | else if (!xafile->d_inode) { |
| 868 | dput(xafile); |
| 869 | return -ENODATA; |
| 870 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 872 | if (!S_ISDIR(xafile->d_inode->i_mode)) |
| 873 | err = notify_change(xafile, attrs); |
| 874 | dput(xafile); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 876 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | } |
| 878 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 879 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 881 | struct file *fp; |
| 882 | struct dentry *dir; |
| 883 | int err = 0; |
| 884 | struct reiserfs_chown_buf buf; |
| 885 | unsigned int ia_valid = attrs->ia_valid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 887 | /* Skip out, an xattr has no xattrs associated with it */ |
| 888 | if (is_reiserfs_priv_object(inode) || |
| 889 | get_inode_sd_version(inode) == STAT_DATA_V1 || |
| 890 | !reiserfs_xattrs(inode->i_sb)) { |
| 891 | return 0; |
| 892 | } |
| 893 | reiserfs_read_lock_xattrs(inode->i_sb); |
| 894 | dir = open_xa_dir(inode, FL_READONLY); |
| 895 | reiserfs_read_unlock_xattrs(inode->i_sb); |
| 896 | if (IS_ERR(dir)) { |
| 897 | if (PTR_ERR(dir) != -ENODATA) |
| 898 | err = PTR_ERR(dir); |
| 899 | goto out; |
| 900 | } else if (!dir->d_inode) { |
| 901 | dput(dir); |
| 902 | goto out; |
| 903 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 905 | fp = dentry_open(dir, NULL, O_RDWR); |
| 906 | if (IS_ERR(fp)) { |
| 907 | err = PTR_ERR(fp); |
| 908 | /* dentry_open dputs the dentry if it fails */ |
| 909 | goto out; |
| 910 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 912 | lock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 914 | attrs->ia_valid &= (ATTR_UID | ATTR_GID | ATTR_CTIME); |
| 915 | buf.xadir = dir; |
| 916 | buf.attrs = attrs; |
| 917 | buf.inode = inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 919 | err = xattr_readdir(fp, reiserfs_chown_xattrs_filler, &buf); |
| 920 | if (err) { |
| 921 | unlock_kernel(); |
| 922 | goto out_dir; |
| 923 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 925 | err = notify_change(dir, attrs); |
| 926 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 928 | out_dir: |
| 929 | fput(fp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 931 | out: |
| 932 | attrs->ia_valid = ia_valid; |
| 933 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | } |
| 935 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | /* Actual operations that are exported to VFS-land */ |
| 937 | |
| 938 | /* |
| 939 | * Inode operation getxattr() |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 940 | * Preliminary locking: we down dentry->d_inode->i_mutex |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | */ |
| 942 | ssize_t |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 943 | reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, |
| 944 | size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 946 | struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(name); |
| 947 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 949 | if (!xah || !reiserfs_xattrs(dentry->d_sb) || |
| 950 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
| 951 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 953 | reiserfs_read_lock_xattr_i(dentry->d_inode); |
| 954 | reiserfs_read_lock_xattrs(dentry->d_sb); |
| 955 | err = xah->get(dentry->d_inode, name, buffer, size); |
| 956 | reiserfs_read_unlock_xattrs(dentry->d_sb); |
| 957 | reiserfs_read_unlock_xattr_i(dentry->d_inode); |
| 958 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | } |
| 960 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | /* |
| 962 | * Inode operation setxattr() |
| 963 | * |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 964 | * dentry->d_inode->i_mutex down |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | */ |
| 966 | int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 967 | reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
| 968 | size_t size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 970 | struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(name); |
| 971 | int err; |
| 972 | int lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 974 | if (!xah || !reiserfs_xattrs(dentry->d_sb) || |
| 975 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
| 976 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 978 | reiserfs_write_lock_xattr_i(dentry->d_inode); |
| 979 | lock = !has_xattr_dir(dentry->d_inode); |
| 980 | if (lock) |
| 981 | reiserfs_write_lock_xattrs(dentry->d_sb); |
| 982 | else |
| 983 | reiserfs_read_lock_xattrs(dentry->d_sb); |
| 984 | err = xah->set(dentry->d_inode, name, value, size, flags); |
| 985 | if (lock) |
| 986 | reiserfs_write_unlock_xattrs(dentry->d_sb); |
| 987 | else |
| 988 | reiserfs_read_unlock_xattrs(dentry->d_sb); |
| 989 | reiserfs_write_unlock_xattr_i(dentry->d_inode); |
| 990 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | } |
| 992 | |
| 993 | /* |
| 994 | * Inode operation removexattr() |
| 995 | * |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 996 | * dentry->d_inode->i_mutex down |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 998 | int reiserfs_removexattr(struct dentry *dentry, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1000 | int err; |
| 1001 | struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1003 | if (!xah || !reiserfs_xattrs(dentry->d_sb) || |
| 1004 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
| 1005 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1007 | reiserfs_write_lock_xattr_i(dentry->d_inode); |
| 1008 | reiserfs_read_lock_xattrs(dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1010 | /* Deletion pre-operation */ |
| 1011 | if (xah->del) { |
| 1012 | err = xah->del(dentry->d_inode, name); |
| 1013 | if (err) |
| 1014 | goto out; |
| 1015 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1017 | err = reiserfs_xattr_del(dentry->d_inode, name); |
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 | dentry->d_inode->i_ctime = CURRENT_TIME_SEC; |
| 1020 | mark_inode_dirty(dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1022 | out: |
| 1023 | reiserfs_read_unlock_xattrs(dentry->d_sb); |
| 1024 | reiserfs_write_unlock_xattr_i(dentry->d_inode); |
| 1025 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | } |
| 1027 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | /* This is what filldir will use: |
| 1029 | * r_pos will always contain the amount of space required for the entire |
| 1030 | * list. If r_pos becomes larger than r_size, we need more space and we |
| 1031 | * return an error indicating this. If r_pos is less than r_size, then we've |
| 1032 | * filled the buffer successfully and we return success */ |
| 1033 | struct reiserfs_listxattr_buf { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1034 | int r_pos; |
| 1035 | int r_size; |
| 1036 | char *r_buf; |
| 1037 | struct inode *r_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | }; |
| 1039 | |
| 1040 | static int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1041 | reiserfs_listxattr_filler(void *buf, const char *name, int namelen, |
| 1042 | loff_t offset, ino_t ino, unsigned int d_type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1044 | struct reiserfs_listxattr_buf *b = (struct reiserfs_listxattr_buf *)buf; |
| 1045 | int len = 0; |
| 1046 | if (name[0] != '.' |
| 1047 | || (namelen != 1 && (name[1] != '.' || namelen != 2))) { |
| 1048 | struct reiserfs_xattr_handler *xah = |
| 1049 | find_xattr_handler_prefix(name); |
| 1050 | if (!xah) |
| 1051 | return 0; /* Unsupported xattr name, skip it */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1053 | /* We call ->list() twice because the operation isn't required to just |
| 1054 | * return the name back - we want to make sure we have enough space */ |
| 1055 | len += xah->list(b->r_inode, name, namelen, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1057 | if (len) { |
| 1058 | if (b->r_pos + len + 1 <= b->r_size) { |
| 1059 | char *p = b->r_buf + b->r_pos; |
| 1060 | p += xah->list(b->r_inode, name, namelen, p); |
| 1061 | *p++ = '\0'; |
| 1062 | } |
| 1063 | b->r_pos += len + 1; |
| 1064 | } |
| 1065 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1067 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | } |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1069 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | /* |
| 1071 | * Inode operation listxattr() |
| 1072 | * |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 1073 | * Preliminary locking: we down dentry->d_inode->i_mutex |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1075 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1077 | struct file *fp; |
| 1078 | struct dentry *dir; |
| 1079 | int err = 0; |
| 1080 | struct reiserfs_listxattr_buf buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1082 | if (!dentry->d_inode) |
| 1083 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1085 | if (!reiserfs_xattrs(dentry->d_sb) || |
| 1086 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
| 1087 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1089 | reiserfs_read_lock_xattr_i(dentry->d_inode); |
| 1090 | reiserfs_read_lock_xattrs(dentry->d_sb); |
| 1091 | dir = open_xa_dir(dentry->d_inode, FL_READONLY); |
| 1092 | reiserfs_read_unlock_xattrs(dentry->d_sb); |
| 1093 | if (IS_ERR(dir)) { |
| 1094 | err = PTR_ERR(dir); |
| 1095 | if (err == -ENODATA) |
| 1096 | err = 0; /* Not an error if there aren't any xattrs */ |
| 1097 | goto out; |
| 1098 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1100 | fp = dentry_open(dir, NULL, O_RDWR); |
| 1101 | if (IS_ERR(fp)) { |
| 1102 | err = PTR_ERR(fp); |
| 1103 | /* dentry_open dputs the dentry if it fails */ |
| 1104 | goto out; |
| 1105 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1107 | buf.r_buf = buffer; |
| 1108 | buf.r_size = buffer ? size : 0; |
| 1109 | buf.r_pos = 0; |
| 1110 | buf.r_inode = dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1112 | REISERFS_I(dentry->d_inode)->i_flags |= i_has_xattr_dir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1114 | err = xattr_readdir(fp, reiserfs_listxattr_filler, &buf); |
| 1115 | if (err) |
| 1116 | goto out_dir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1118 | if (buf.r_pos > buf.r_size && buffer != NULL) |
| 1119 | err = -ERANGE; |
| 1120 | else |
| 1121 | err = buf.r_pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1123 | out_dir: |
| 1124 | fput(fp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1126 | out: |
| 1127 | reiserfs_read_unlock_xattr_i(dentry->d_inode); |
| 1128 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | } |
| 1130 | |
| 1131 | /* This is the implementation for the xattr plugin infrastructure */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1132 | static struct list_head xattr_handlers = LIST_HEAD_INIT(xattr_handlers); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | static DEFINE_RWLOCK(handler_lock); |
| 1134 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1135 | static struct reiserfs_xattr_handler *find_xattr_handler_prefix(const char |
| 1136 | *prefix) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1138 | struct reiserfs_xattr_handler *xah = NULL; |
| 1139 | struct list_head *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1141 | read_lock(&handler_lock); |
| 1142 | list_for_each(p, &xattr_handlers) { |
| 1143 | xah = list_entry(p, struct reiserfs_xattr_handler, handlers); |
| 1144 | if (strncmp(xah->prefix, prefix, strlen(xah->prefix)) == 0) |
| 1145 | break; |
| 1146 | xah = NULL; |
| 1147 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1149 | read_unlock(&handler_lock); |
| 1150 | return xah; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | } |
| 1152 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1153 | static void __unregister_handlers(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1155 | struct reiserfs_xattr_handler *xah; |
| 1156 | struct list_head *p, *tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1158 | list_for_each_safe(p, tmp, &xattr_handlers) { |
| 1159 | xah = list_entry(p, struct reiserfs_xattr_handler, handlers); |
| 1160 | if (xah->exit) |
| 1161 | xah->exit(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1163 | list_del_init(p); |
| 1164 | } |
| 1165 | INIT_LIST_HEAD(&xattr_handlers); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | } |
| 1167 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1168 | int __init reiserfs_xattr_register_handlers(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1170 | int err = 0; |
| 1171 | struct reiserfs_xattr_handler *xah; |
| 1172 | struct list_head *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1174 | write_lock(&handler_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1176 | /* If we're already initialized, nothing to do */ |
| 1177 | if (!list_empty(&xattr_handlers)) { |
| 1178 | write_unlock(&handler_lock); |
| 1179 | return 0; |
| 1180 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1182 | /* Add the handlers */ |
| 1183 | list_add_tail(&user_handler.handlers, &xattr_handlers); |
| 1184 | list_add_tail(&trusted_handler.handlers, &xattr_handlers); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | #ifdef CONFIG_REISERFS_FS_SECURITY |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1186 | list_add_tail(&security_handler.handlers, &xattr_handlers); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | #endif |
| 1188 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1189 | list_add_tail(&posix_acl_access_handler.handlers, &xattr_handlers); |
| 1190 | list_add_tail(&posix_acl_default_handler.handlers, &xattr_handlers); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | #endif |
| 1192 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1193 | /* Run initializers, if available */ |
| 1194 | list_for_each(p, &xattr_handlers) { |
| 1195 | xah = list_entry(p, struct reiserfs_xattr_handler, handlers); |
| 1196 | if (xah->init) { |
| 1197 | err = xah->init(); |
| 1198 | if (err) { |
| 1199 | list_del_init(p); |
| 1200 | break; |
| 1201 | } |
| 1202 | } |
| 1203 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1205 | /* Clean up other handlers, if any failed */ |
| 1206 | if (err) |
| 1207 | __unregister_handlers(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1209 | write_unlock(&handler_lock); |
| 1210 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1211 | } |
| 1212 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1213 | void reiserfs_xattr_unregister_handlers(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1215 | write_lock(&handler_lock); |
| 1216 | __unregister_handlers(); |
| 1217 | write_unlock(&handler_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | } |
| 1219 | |
| 1220 | /* This will catch lookups from the fs root to .reiserfs_priv */ |
| 1221 | static int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1222 | xattr_lookup_poison(struct dentry *dentry, struct qstr *q1, struct qstr *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1224 | struct dentry *priv_root = REISERFS_SB(dentry->d_sb)->priv_root; |
| 1225 | if (name->len == priv_root->d_name.len && |
| 1226 | name->hash == priv_root->d_name.hash && |
| 1227 | !memcmp(name->name, priv_root->d_name.name, name->len)) { |
| 1228 | return -ENOENT; |
| 1229 | } else if (q1->len == name->len && |
| 1230 | !memcmp(q1->name, name->name, name->len)) |
| 1231 | return 0; |
| 1232 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | } |
| 1234 | |
| 1235 | static struct dentry_operations xattr_lookup_poison_ops = { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1236 | .d_compare = xattr_lookup_poison, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | }; |
| 1238 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | /* We need to take a copy of the mount flags since things like |
| 1240 | * MS_RDONLY don't get set until *after* we're called. |
| 1241 | * mount_flags != mount_options */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1242 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1244 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1246 | /* We need generation numbers to ensure that the oid mapping is correct |
| 1247 | * v3.5 filesystems don't have them. */ |
| 1248 | if (!old_format_only(s)) { |
| 1249 | set_bit(REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt)); |
| 1250 | } else if (reiserfs_xattrs_optional(s)) { |
| 1251 | /* Old format filesystem, but optional xattrs have been enabled |
| 1252 | * at mount time. Error out. */ |
| 1253 | reiserfs_warning(s, "xattrs/ACLs not supported on pre v3.6 " |
| 1254 | "format filesystem. Failing mount."); |
| 1255 | err = -EOPNOTSUPP; |
| 1256 | goto error; |
| 1257 | } else { |
| 1258 | /* Old format filesystem, but no optional xattrs have been enabled. This |
| 1259 | * means we silently disable xattrs on the filesystem. */ |
| 1260 | clear_bit(REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt)); |
| 1261 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1263 | /* If we don't have the privroot located yet - go find it */ |
| 1264 | if (reiserfs_xattrs(s) && !REISERFS_SB(s)->priv_root) { |
| 1265 | struct dentry *dentry; |
| 1266 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, |
| 1267 | strlen(PRIVROOT_NAME)); |
| 1268 | if (!IS_ERR(dentry)) { |
| 1269 | if (!(mount_flags & MS_RDONLY) && !dentry->d_inode) { |
| 1270 | struct inode *inode = dentry->d_parent->d_inode; |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 1271 | mutex_lock(&inode->i_mutex); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1272 | err = inode->i_op->mkdir(inode, dentry, 0700); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 1273 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1274 | if (err) { |
| 1275 | dput(dentry); |
| 1276 | dentry = NULL; |
| 1277 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1279 | if (dentry && dentry->d_inode) |
| 1280 | reiserfs_warning(s, |
| 1281 | "Created %s on %s - reserved for " |
| 1282 | "xattr storage.", |
| 1283 | PRIVROOT_NAME, |
| 1284 | reiserfs_bdevname |
| 1285 | (inode->i_sb)); |
| 1286 | } else if (!dentry->d_inode) { |
| 1287 | dput(dentry); |
| 1288 | dentry = NULL; |
| 1289 | } |
| 1290 | } else |
| 1291 | err = PTR_ERR(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1293 | if (!err && dentry) { |
| 1294 | s->s_root->d_op = &xattr_lookup_poison_ops; |
| 1295 | reiserfs_mark_inode_private(dentry->d_inode); |
| 1296 | REISERFS_SB(s)->priv_root = dentry; |
| 1297 | } else if (!(mount_flags & MS_RDONLY)) { /* xattrs are unavailable */ |
| 1298 | /* If we're read-only it just means that the dir hasn't been |
| 1299 | * created. Not an error -- just no xattrs on the fs. We'll |
| 1300 | * check again if we go read-write */ |
| 1301 | reiserfs_warning(s, "xattrs/ACLs enabled and couldn't " |
| 1302 | "find/create .reiserfs_priv. Failing mount."); |
| 1303 | err = -EOPNOTSUPP; |
| 1304 | } |
| 1305 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1307 | error: |
| 1308 | /* This is only nonzero if there was an error initializing the xattr |
| 1309 | * directory or if there is a condition where we don't support them. */ |
| 1310 | if (err) { |
| 1311 | clear_bit(REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt)); |
| 1312 | clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt)); |
| 1313 | clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt)); |
| 1314 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1316 | /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */ |
| 1317 | s->s_flags = s->s_flags & ~MS_POSIXACL; |
| 1318 | if (reiserfs_posixacl(s)) |
| 1319 | s->s_flags |= MS_POSIXACL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1321 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1322 | } |
| 1323 | |
| 1324 | static int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1325 | __reiserfs_permission(struct inode *inode, int mask, struct nameidata *nd, |
| 1326 | int need_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1328 | umode_t mode = inode->i_mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | |
| 1330 | if (mask & MAY_WRITE) { |
| 1331 | /* |
| 1332 | * Nobody gets write access to a read-only fs. |
| 1333 | */ |
| 1334 | if (IS_RDONLY(inode) && |
| 1335 | (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) |
| 1336 | return -EROFS; |
| 1337 | |
| 1338 | /* |
| 1339 | * Nobody gets write access to an immutable file. |
| 1340 | */ |
| 1341 | if (IS_IMMUTABLE(inode)) |
| 1342 | return -EACCES; |
| 1343 | } |
| 1344 | |
| 1345 | /* We don't do permission checks on the internal objects. |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1346 | * Permissions are determined by the "owning" object. */ |
| 1347 | if (is_reiserfs_priv_object(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | return 0; |
| 1349 | |
| 1350 | if (current->fsuid == inode->i_uid) { |
| 1351 | mode >>= 6; |
| 1352 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL |
| 1353 | } else if (reiserfs_posixacl(inode->i_sb) && |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1354 | get_inode_sd_version(inode) != STAT_DATA_V1) { |
| 1355 | struct posix_acl *acl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | |
| 1357 | /* ACL can't contain additional permissions if |
| 1358 | the ACL_MASK entry is 0 */ |
| 1359 | if (!(mode & S_IRWXG)) |
| 1360 | goto check_groups; |
| 1361 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1362 | if (need_lock) { |
| 1363 | reiserfs_read_lock_xattr_i(inode); |
| 1364 | reiserfs_read_lock_xattrs(inode->i_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | } |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1366 | acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS); |
| 1367 | if (need_lock) { |
| 1368 | reiserfs_read_unlock_xattrs(inode->i_sb); |
| 1369 | reiserfs_read_unlock_xattr_i(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | } |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1371 | if (IS_ERR(acl)) { |
| 1372 | if (PTR_ERR(acl) == -ENODATA) |
| 1373 | goto check_groups; |
| 1374 | return PTR_ERR(acl); |
| 1375 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1377 | if (acl) { |
| 1378 | int err = posix_acl_permission(inode, acl, mask); |
| 1379 | posix_acl_release(acl); |
| 1380 | if (err == -EACCES) { |
| 1381 | goto check_capabilities; |
| 1382 | } |
| 1383 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | } else { |
| 1385 | goto check_groups; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1386 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | #endif |
| 1388 | } else { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1389 | check_groups: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | if (in_group_p(inode->i_gid)) |
| 1391 | mode >>= 3; |
| 1392 | } |
| 1393 | |
| 1394 | /* |
| 1395 | * If the DACs are ok we don't need any capability check. |
| 1396 | */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1397 | if (((mode & mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == mask)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | return 0; |
| 1399 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1400 | check_capabilities: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | /* |
| 1402 | * Read/write DACs are always overridable. |
| 1403 | * Executable DACs are overridable if at least one exec bit is set. |
| 1404 | */ |
| 1405 | if (!(mask & MAY_EXEC) || |
| 1406 | (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode)) |
| 1407 | if (capable(CAP_DAC_OVERRIDE)) |
| 1408 | return 0; |
| 1409 | |
| 1410 | /* |
| 1411 | * Searching includes executable on directories, else just read. |
| 1412 | */ |
| 1413 | if (mask == MAY_READ || (S_ISDIR(inode->i_mode) && !(mask & MAY_WRITE))) |
| 1414 | if (capable(CAP_DAC_READ_SEARCH)) |
| 1415 | return 0; |
| 1416 | |
| 1417 | return -EACCES; |
| 1418 | } |
| 1419 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1420 | int reiserfs_permission(struct inode *inode, int mask, struct nameidata *nd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1422 | return __reiserfs_permission(inode, mask, nd, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | } |
| 1424 | |
| 1425 | int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1426 | reiserfs_permission_locked(struct inode *inode, int mask, struct nameidata *nd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame] | 1428 | return __reiserfs_permission(inode, mask, nd, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | } |