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> |
| 42 | #include <linux/mbcache.h> |
| 43 | #include <asm/uaccess.h> |
| 44 | #include <asm/checksum.h> |
| 45 | #include <linux/smp_lock.h> |
| 46 | #include <linux/stat.h> |
| 47 | #include <asm/semaphore.h> |
| 48 | |
| 49 | #define FL_READONLY 128 |
| 50 | #define FL_DIR_SEM_HELD 256 |
| 51 | #define PRIVROOT_NAME ".reiserfs_priv" |
| 52 | #define XAROOT_NAME "xattrs" |
| 53 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 54 | static struct reiserfs_xattr_handler *find_xattr_handler_prefix(const char |
| 55 | *prefix); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 57 | static struct dentry *create_xa_root(struct super_block *sb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 59 | struct dentry *privroot = dget(REISERFS_SB(sb)->priv_root); |
| 60 | struct dentry *xaroot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 62 | /* This needs to be created at mount-time */ |
| 63 | if (!privroot) |
| 64 | return ERR_PTR(-EOPNOTSUPP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 66 | xaroot = lookup_one_len(XAROOT_NAME, privroot, strlen(XAROOT_NAME)); |
| 67 | if (IS_ERR(xaroot)) { |
| 68 | goto out; |
| 69 | } else if (!xaroot->d_inode) { |
| 70 | int err; |
| 71 | down(&privroot->d_inode->i_sem); |
| 72 | err = |
| 73 | privroot->d_inode->i_op->mkdir(privroot->d_inode, xaroot, |
| 74 | 0700); |
| 75 | up(&privroot->d_inode->i_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 77 | if (err) { |
| 78 | dput(xaroot); |
| 79 | dput(privroot); |
| 80 | return ERR_PTR(err); |
| 81 | } |
| 82 | REISERFS_SB(sb)->xattr_root = dget(xaroot); |
| 83 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 85 | out: |
| 86 | dput(privroot); |
| 87 | return xaroot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | } |
| 89 | |
| 90 | /* This will return a dentry, or error, refering to the xa root directory. |
| 91 | * If the xa root doesn't exist yet, the dentry will be returned without |
| 92 | * an associated inode. This dentry can be used with ->mkdir to create |
| 93 | * the xa directory. */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 94 | static struct dentry *__get_xa_root(struct super_block *s) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 96 | struct dentry *privroot = dget(REISERFS_SB(s)->priv_root); |
| 97 | struct dentry *xaroot = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 99 | if (IS_ERR(privroot) || !privroot) |
| 100 | return privroot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 102 | xaroot = lookup_one_len(XAROOT_NAME, privroot, strlen(XAROOT_NAME)); |
| 103 | if (IS_ERR(xaroot)) { |
| 104 | goto out; |
| 105 | } else if (!xaroot->d_inode) { |
| 106 | dput(xaroot); |
| 107 | xaroot = NULL; |
| 108 | goto out; |
| 109 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 111 | REISERFS_SB(s)->xattr_root = dget(xaroot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 113 | out: |
| 114 | dput(privroot); |
| 115 | return xaroot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | } |
| 117 | |
| 118 | /* Returns the dentry (or NULL) referring to the root of the extended |
| 119 | * attribute directory tree. If it has already been retreived, it is used. |
| 120 | * Otherwise, we attempt to retreive it from disk. It may also return |
| 121 | * a pointer-encoded error. |
| 122 | */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 123 | static inline struct dentry *get_xa_root(struct super_block *s) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 125 | struct dentry *dentry = dget(REISERFS_SB(s)->xattr_root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 127 | if (!dentry) |
| 128 | dentry = __get_xa_root(s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 130 | return dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | } |
| 132 | |
| 133 | /* Opens the directory corresponding to the inode's extended attribute store. |
| 134 | * If flags allow, the tree to the directory may be created. If creation is |
| 135 | * prohibited, -ENODATA is returned. */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 136 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 138 | struct dentry *xaroot, *xadir; |
| 139 | char namebuf[17]; |
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 | xaroot = get_xa_root(inode->i_sb); |
| 142 | if (IS_ERR(xaroot)) { |
| 143 | return xaroot; |
| 144 | } else if (!xaroot) { |
| 145 | if (flags == 0 || flags & XATTR_CREATE) { |
| 146 | xaroot = create_xa_root(inode->i_sb); |
| 147 | if (IS_ERR(xaroot)) |
| 148 | return xaroot; |
| 149 | } |
| 150 | if (!xaroot) |
| 151 | return ERR_PTR(-ENODATA); |
| 152 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 154 | /* ok, we have xaroot open */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 156 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
| 157 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), |
| 158 | inode->i_generation); |
| 159 | xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf)); |
| 160 | if (IS_ERR(xadir)) { |
| 161 | dput(xaroot); |
| 162 | return xadir; |
| 163 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 165 | if (!xadir->d_inode) { |
| 166 | int err; |
| 167 | if (flags == 0 || flags & XATTR_CREATE) { |
| 168 | /* Although there is nothing else trying to create this directory, |
| 169 | * another directory with the same hash may be created, so we need |
| 170 | * to protect against that */ |
| 171 | err = |
| 172 | xaroot->d_inode->i_op->mkdir(xaroot->d_inode, xadir, |
| 173 | 0700); |
| 174 | if (err) { |
| 175 | dput(xaroot); |
| 176 | dput(xadir); |
| 177 | return ERR_PTR(err); |
| 178 | } |
| 179 | } |
| 180 | if (!xadir->d_inode) { |
| 181 | dput(xaroot); |
| 182 | dput(xadir); |
| 183 | return ERR_PTR(-ENODATA); |
| 184 | } |
| 185 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 187 | dput(xaroot); |
| 188 | return xadir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | /* Returns a dentry corresponding to a specific extended attribute file |
| 192 | * for the inode. If flags allow, the file is created. Otherwise, a |
| 193 | * valid or negative dentry, or an error is returned. */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 194 | static struct dentry *get_xa_file_dentry(const struct inode *inode, |
| 195 | const char *name, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 197 | struct dentry *xadir, *xafile; |
| 198 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 200 | xadir = open_xa_dir(inode, flags); |
| 201 | if (IS_ERR(xadir)) { |
| 202 | return ERR_PTR(PTR_ERR(xadir)); |
| 203 | } else if (xadir && !xadir->d_inode) { |
| 204 | dput(xadir); |
| 205 | return ERR_PTR(-ENODATA); |
| 206 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 208 | xafile = lookup_one_len(name, xadir, strlen(name)); |
| 209 | if (IS_ERR(xafile)) { |
| 210 | dput(xadir); |
| 211 | return ERR_PTR(PTR_ERR(xafile)); |
| 212 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 214 | if (xafile->d_inode) { /* file exists */ |
| 215 | if (flags & XATTR_CREATE) { |
| 216 | err = -EEXIST; |
| 217 | dput(xafile); |
| 218 | goto out; |
| 219 | } |
| 220 | } else if (flags & XATTR_REPLACE || flags & FL_READONLY) { |
| 221 | goto out; |
| 222 | } else { |
| 223 | /* inode->i_sem is down, so nothing else can try to create |
| 224 | * the same xattr */ |
| 225 | err = xadir->d_inode->i_op->create(xadir->d_inode, xafile, |
| 226 | 0700 | S_IFREG, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 228 | if (err) { |
| 229 | dput(xafile); |
| 230 | goto out; |
| 231 | } |
| 232 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 234 | out: |
| 235 | dput(xadir); |
| 236 | if (err) |
| 237 | xafile = ERR_PTR(err); |
| 238 | return xafile; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | } |
| 240 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | /* Opens a file pointer to the attribute associated with inode */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 242 | static struct file *open_xa_file(const struct inode *inode, const char *name, |
| 243 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 245 | struct dentry *xafile; |
| 246 | struct file *fp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 248 | xafile = get_xa_file_dentry(inode, name, flags); |
| 249 | if (IS_ERR(xafile)) |
| 250 | return ERR_PTR(PTR_ERR(xafile)); |
| 251 | else if (!xafile->d_inode) { |
| 252 | dput(xafile); |
| 253 | return ERR_PTR(-ENODATA); |
| 254 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 256 | fp = dentry_open(xafile, NULL, O_RDWR); |
| 257 | /* dentry_open dputs the dentry if it fails */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 259 | return fp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | } |
| 261 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | /* |
| 263 | * this is very similar to fs/reiserfs/dir.c:reiserfs_readdir, but |
| 264 | * we need to drop the path before calling the filldir struct. That |
| 265 | * would be a big performance hit to the non-xattr case, so I've copied |
| 266 | * the whole thing for now. --clm |
| 267 | * |
| 268 | * the big difference is that I go backwards through the directory, |
| 269 | * and don't mess with f->f_pos, but the idea is the same. Do some |
| 270 | * action on each and every entry in the directory. |
| 271 | * |
| 272 | * we're called with i_sem held, so there are no worries about the directory |
| 273 | * changing underneath us. |
| 274 | */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 275 | static int __xattr_readdir(struct file *filp, void *dirent, filldir_t filldir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 277 | struct inode *inode = filp->f_dentry->d_inode; |
| 278 | struct cpu_key pos_key; /* key of current position in the directory (key of directory entry) */ |
| 279 | INITIALIZE_PATH(path_to_entry); |
| 280 | struct buffer_head *bh; |
| 281 | int entry_num; |
| 282 | struct item_head *ih, tmp_ih; |
| 283 | int search_res; |
| 284 | char *local_buf; |
| 285 | loff_t next_pos; |
| 286 | char small_buf[32]; /* avoid kmalloc if we can */ |
| 287 | struct reiserfs_de_head *deh; |
| 288 | int d_reclen; |
| 289 | char *d_name; |
| 290 | off_t d_off; |
| 291 | ino_t d_ino; |
| 292 | struct reiserfs_dir_entry de; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 294 | /* form key for search the next directory entry using f_pos field of |
| 295 | file structure */ |
| 296 | next_pos = max_reiserfs_offset(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 298 | while (1) { |
| 299 | research: |
| 300 | if (next_pos <= DOT_DOT_OFFSET) |
| 301 | break; |
| 302 | make_cpu_key(&pos_key, inode, next_pos, TYPE_DIRENTRY, 3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 304 | search_res = |
| 305 | search_by_entry_key(inode->i_sb, &pos_key, &path_to_entry, |
| 306 | &de); |
| 307 | if (search_res == IO_ERROR) { |
| 308 | // FIXME: we could just skip part of directory which could |
| 309 | // not be read |
| 310 | pathrelse(&path_to_entry); |
| 311 | return -EIO; |
| 312 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 314 | if (search_res == NAME_NOT_FOUND) |
| 315 | de.de_entry_num--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 317 | set_de_name_and_namelen(&de); |
| 318 | entry_num = de.de_entry_num; |
| 319 | deh = &(de.de_deh[entry_num]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 321 | bh = de.de_bh; |
| 322 | ih = de.de_ih; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 324 | if (!is_direntry_le_ih(ih)) { |
| 325 | reiserfs_warning(inode->i_sb, "not direntry %h", ih); |
| 326 | break; |
| 327 | } |
| 328 | copy_item_head(&tmp_ih, ih); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 330 | /* we must have found item, that is item of this directory, */ |
| 331 | RFALSE(COMP_SHORT_KEYS(&(ih->ih_key), &pos_key), |
| 332 | "vs-9000: found item %h does not match to dir we readdir %K", |
| 333 | ih, &pos_key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 335 | if (deh_offset(deh) <= DOT_DOT_OFFSET) { |
| 336 | break; |
| 337 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 339 | /* look for the previous entry in the directory */ |
| 340 | next_pos = deh_offset(deh) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 342 | if (!de_visible(deh)) |
| 343 | /* it is hidden entry */ |
| 344 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 346 | d_reclen = entry_length(bh, ih, entry_num); |
| 347 | d_name = B_I_DEH_ENTRY_FILE_NAME(bh, ih, deh); |
| 348 | d_off = deh_offset(deh); |
| 349 | d_ino = deh_objectid(deh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 351 | if (!d_name[d_reclen - 1]) |
| 352 | d_reclen = strlen(d_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 354 | if (d_reclen > REISERFS_MAX_NAME(inode->i_sb->s_blocksize)) { |
| 355 | /* too big to send back to VFS */ |
| 356 | continue; |
| 357 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 359 | /* Ignore the .reiserfs_priv entry */ |
| 360 | if (reiserfs_xattrs(inode->i_sb) && |
| 361 | !old_format_only(inode->i_sb) && |
| 362 | deh_objectid(deh) == |
| 363 | le32_to_cpu(INODE_PKEY |
| 364 | (REISERFS_SB(inode->i_sb)->priv_root->d_inode)-> |
| 365 | k_objectid)) |
| 366 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 368 | if (d_reclen <= 32) { |
| 369 | local_buf = small_buf; |
| 370 | } else { |
| 371 | local_buf = |
| 372 | reiserfs_kmalloc(d_reclen, GFP_NOFS, inode->i_sb); |
| 373 | if (!local_buf) { |
| 374 | pathrelse(&path_to_entry); |
| 375 | return -ENOMEM; |
| 376 | } |
| 377 | if (item_moved(&tmp_ih, &path_to_entry)) { |
| 378 | reiserfs_kfree(local_buf, d_reclen, |
| 379 | inode->i_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 381 | /* sigh, must retry. Do this same offset again */ |
| 382 | next_pos = d_off; |
| 383 | goto research; |
| 384 | } |
| 385 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 387 | // Note, that we copy name to user space via temporary |
| 388 | // buffer (local_buf) because filldir will block if |
| 389 | // user space buffer is swapped out. At that time |
| 390 | // entry can move to somewhere else |
| 391 | memcpy(local_buf, d_name, d_reclen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 393 | /* the filldir function might need to start transactions, |
| 394 | * or do who knows what. Release the path now that we've |
| 395 | * copied all the important stuff out of the deh |
| 396 | */ |
| 397 | pathrelse(&path_to_entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 399 | if (filldir(dirent, local_buf, d_reclen, d_off, d_ino, |
| 400 | DT_UNKNOWN) < 0) { |
| 401 | if (local_buf != small_buf) { |
| 402 | reiserfs_kfree(local_buf, d_reclen, |
| 403 | inode->i_sb); |
| 404 | } |
| 405 | goto end; |
| 406 | } |
| 407 | if (local_buf != small_buf) { |
| 408 | reiserfs_kfree(local_buf, d_reclen, inode->i_sb); |
| 409 | } |
| 410 | } /* while */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 412 | end: |
| 413 | pathrelse(&path_to_entry); |
| 414 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | } |
| 416 | |
| 417 | /* |
| 418 | * this could be done with dedicated readdir ops for the xattr files, |
| 419 | * but I want to get something working asap |
| 420 | * this is stolen from vfs_readdir |
| 421 | * |
| 422 | */ |
| 423 | static |
| 424 | int xattr_readdir(struct file *file, filldir_t filler, void *buf) |
| 425 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 426 | struct inode *inode = file->f_dentry->d_inode; |
| 427 | int res = -ENOTDIR; |
| 428 | if (!file->f_op || !file->f_op->readdir) |
| 429 | goto out; |
| 430 | down(&inode->i_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | // down(&inode->i_zombie); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 432 | res = -ENOENT; |
| 433 | if (!IS_DEADDIR(inode)) { |
| 434 | lock_kernel(); |
| 435 | res = __xattr_readdir(file, buf, filler); |
| 436 | unlock_kernel(); |
| 437 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | // up(&inode->i_zombie); |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 439 | up(&inode->i_sem); |
| 440 | out: |
| 441 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | } |
| 443 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | /* Internal operations on file data */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 445 | static inline void reiserfs_put_page(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 447 | kunmap(page); |
| 448 | page_cache_release(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | } |
| 450 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 451 | static struct page *reiserfs_get_page(struct inode *dir, unsigned long n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 453 | struct address_space *mapping = dir->i_mapping; |
| 454 | struct page *page; |
| 455 | /* We can deadlock if we try to free dentries, |
| 456 | and an unlink/rmdir has just occured - GFP_NOFS avoids this */ |
| 457 | mapping->flags = (mapping->flags & ~__GFP_BITS_MASK) | GFP_NOFS; |
| 458 | page = read_cache_page(mapping, n, |
| 459 | (filler_t *) mapping->a_ops->readpage, NULL); |
| 460 | if (!IS_ERR(page)) { |
| 461 | wait_on_page_locked(page); |
| 462 | kmap(page); |
| 463 | if (!PageUptodate(page)) |
| 464 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 466 | if (PageError(page)) |
| 467 | goto fail; |
| 468 | } |
| 469 | return page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 471 | fail: |
| 472 | reiserfs_put_page(page); |
| 473 | return ERR_PTR(-EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | } |
| 475 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 476 | static inline __u32 xattr_hash(const char *msg, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 478 | return csum_partial(msg, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | } |
| 480 | |
| 481 | /* Generic extended attribute operations that can be used by xa plugins */ |
| 482 | |
| 483 | /* |
| 484 | * inode->i_sem: down |
| 485 | */ |
| 486 | int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 487 | reiserfs_xattr_set(struct inode *inode, const char *name, const void *buffer, |
| 488 | size_t buffer_size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 490 | int err = 0; |
| 491 | struct file *fp; |
| 492 | struct page *page; |
| 493 | char *data; |
| 494 | struct address_space *mapping; |
| 495 | size_t file_pos = 0; |
| 496 | size_t buffer_pos = 0; |
| 497 | struct inode *xinode; |
| 498 | struct iattr newattrs; |
| 499 | __u32 xahash = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 501 | if (IS_RDONLY(inode)) |
| 502 | return -EROFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 504 | if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) |
| 505 | return -EPERM; |
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 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
| 508 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 510 | /* Empty xattrs are ok, they're just empty files, no hash */ |
| 511 | if (buffer && buffer_size) |
| 512 | xahash = xattr_hash(buffer, buffer_size); |
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 | open_file: |
| 515 | fp = open_xa_file(inode, name, flags); |
| 516 | if (IS_ERR(fp)) { |
| 517 | err = PTR_ERR(fp); |
| 518 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 521 | xinode = fp->f_dentry->d_inode; |
| 522 | REISERFS_I(inode)->i_flags |= i_has_xattr_dir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 524 | /* we need to copy it off.. */ |
| 525 | if (xinode->i_nlink > 1) { |
| 526 | fput(fp); |
| 527 | err = reiserfs_xattr_del(inode, name); |
| 528 | if (err < 0) |
| 529 | goto out; |
| 530 | /* We just killed the old one, we're not replacing anymore */ |
| 531 | if (flags & XATTR_REPLACE) |
| 532 | flags &= ~XATTR_REPLACE; |
| 533 | goto open_file; |
| 534 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 536 | /* Resize it so we're ok to write there */ |
| 537 | newattrs.ia_size = buffer_size; |
| 538 | newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME; |
| 539 | down(&xinode->i_sem); |
| 540 | err = notify_change(fp->f_dentry, &newattrs); |
| 541 | if (err) |
| 542 | goto out_filp; |
| 543 | |
| 544 | mapping = xinode->i_mapping; |
| 545 | while (buffer_pos < buffer_size || buffer_pos == 0) { |
| 546 | size_t chunk; |
| 547 | size_t skip = 0; |
| 548 | size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1)); |
| 549 | if (buffer_size - buffer_pos > PAGE_CACHE_SIZE) |
| 550 | chunk = PAGE_CACHE_SIZE; |
| 551 | else |
| 552 | chunk = buffer_size - buffer_pos; |
| 553 | |
| 554 | page = reiserfs_get_page(xinode, file_pos >> PAGE_CACHE_SHIFT); |
| 555 | if (IS_ERR(page)) { |
| 556 | err = PTR_ERR(page); |
| 557 | goto out_filp; |
| 558 | } |
| 559 | |
| 560 | lock_page(page); |
| 561 | data = page_address(page); |
| 562 | |
| 563 | if (file_pos == 0) { |
| 564 | struct reiserfs_xattr_header *rxh; |
| 565 | skip = file_pos = sizeof(struct reiserfs_xattr_header); |
| 566 | if (chunk + skip > PAGE_CACHE_SIZE) |
| 567 | chunk = PAGE_CACHE_SIZE - skip; |
| 568 | rxh = (struct reiserfs_xattr_header *)data; |
| 569 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); |
| 570 | rxh->h_hash = cpu_to_le32(xahash); |
| 571 | } |
| 572 | |
| 573 | err = mapping->a_ops->prepare_write(fp, page, page_offset, |
| 574 | page_offset + chunk + skip); |
| 575 | if (!err) { |
| 576 | if (buffer) |
| 577 | memcpy(data + skip, buffer + buffer_pos, chunk); |
| 578 | err = |
| 579 | mapping->a_ops->commit_write(fp, page, page_offset, |
| 580 | page_offset + chunk + |
| 581 | skip); |
| 582 | } |
| 583 | unlock_page(page); |
| 584 | reiserfs_put_page(page); |
| 585 | buffer_pos += chunk; |
| 586 | file_pos += chunk; |
| 587 | skip = 0; |
| 588 | if (err || buffer_size == 0 || !buffer) |
| 589 | break; |
| 590 | } |
| 591 | |
| 592 | /* We can't mark the inode dirty if it's not hashed. This is the case |
| 593 | * when we're inheriting the default ACL. If we dirty it, the inode |
| 594 | * gets marked dirty, but won't (ever) make it onto the dirty list until |
| 595 | * it's synced explicitly to clear I_DIRTY. This is bad. */ |
| 596 | if (!hlist_unhashed(&inode->i_hash)) { |
| 597 | inode->i_ctime = CURRENT_TIME_SEC; |
| 598 | mark_inode_dirty(inode); |
| 599 | } |
| 600 | |
| 601 | out_filp: |
| 602 | up(&xinode->i_sem); |
| 603 | fput(fp); |
| 604 | |
| 605 | out: |
| 606 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | } |
| 608 | |
| 609 | /* |
| 610 | * inode->i_sem: down |
| 611 | */ |
| 612 | int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 613 | reiserfs_xattr_get(const struct inode *inode, const char *name, void *buffer, |
| 614 | size_t buffer_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 616 | ssize_t err = 0; |
| 617 | struct file *fp; |
| 618 | size_t isize; |
| 619 | size_t file_pos = 0; |
| 620 | size_t buffer_pos = 0; |
| 621 | struct page *page; |
| 622 | struct inode *xinode; |
| 623 | __u32 hash = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 625 | if (name == NULL) |
| 626 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 628 | /* We can't have xattrs attached to v1 items since they don't have |
| 629 | * generation numbers */ |
| 630 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
| 631 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 633 | fp = open_xa_file(inode, name, FL_READONLY); |
| 634 | if (IS_ERR(fp)) { |
| 635 | err = PTR_ERR(fp); |
| 636 | goto out; |
| 637 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 639 | xinode = fp->f_dentry->d_inode; |
| 640 | isize = xinode->i_size; |
| 641 | REISERFS_I(inode)->i_flags |= i_has_xattr_dir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 643 | /* Just return the size needed */ |
| 644 | if (buffer == NULL) { |
| 645 | err = isize - sizeof(struct reiserfs_xattr_header); |
| 646 | goto out_dput; |
| 647 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 649 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { |
| 650 | err = -ERANGE; |
| 651 | goto out_dput; |
| 652 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 654 | while (file_pos < isize) { |
| 655 | size_t chunk; |
| 656 | char *data; |
| 657 | size_t skip = 0; |
| 658 | if (isize - file_pos > PAGE_CACHE_SIZE) |
| 659 | chunk = PAGE_CACHE_SIZE; |
| 660 | else |
| 661 | chunk = isize - file_pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 663 | page = reiserfs_get_page(xinode, file_pos >> PAGE_CACHE_SHIFT); |
| 664 | if (IS_ERR(page)) { |
| 665 | err = PTR_ERR(page); |
| 666 | goto out_dput; |
| 667 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 669 | lock_page(page); |
| 670 | data = page_address(page); |
| 671 | if (file_pos == 0) { |
| 672 | struct reiserfs_xattr_header *rxh = |
| 673 | (struct reiserfs_xattr_header *)data; |
| 674 | skip = file_pos = sizeof(struct reiserfs_xattr_header); |
| 675 | chunk -= skip; |
| 676 | /* Magic doesn't match up.. */ |
| 677 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { |
| 678 | unlock_page(page); |
| 679 | reiserfs_put_page(page); |
| 680 | reiserfs_warning(inode->i_sb, |
| 681 | "Invalid magic for xattr (%s) " |
| 682 | "associated with %k", name, |
| 683 | INODE_PKEY(inode)); |
| 684 | err = -EIO; |
| 685 | goto out_dput; |
| 686 | } |
| 687 | hash = le32_to_cpu(rxh->h_hash); |
| 688 | } |
| 689 | memcpy(buffer + buffer_pos, data + skip, chunk); |
| 690 | unlock_page(page); |
| 691 | reiserfs_put_page(page); |
| 692 | file_pos += chunk; |
| 693 | buffer_pos += chunk; |
| 694 | skip = 0; |
| 695 | } |
| 696 | err = isize - sizeof(struct reiserfs_xattr_header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 698 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != |
| 699 | hash) { |
| 700 | reiserfs_warning(inode->i_sb, |
| 701 | "Invalid hash for xattr (%s) associated " |
| 702 | "with %k", name, INODE_PKEY(inode)); |
| 703 | err = -EIO; |
| 704 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 706 | out_dput: |
| 707 | fput(fp); |
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 | out: |
| 710 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | } |
| 712 | |
| 713 | static int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 714 | __reiserfs_xattr_del(struct dentry *xadir, const char *name, int namelen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 716 | struct dentry *dentry; |
| 717 | struct inode *dir = xadir->d_inode; |
| 718 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 720 | dentry = lookup_one_len(name, xadir, namelen); |
| 721 | if (IS_ERR(dentry)) { |
| 722 | err = PTR_ERR(dentry); |
| 723 | goto out; |
| 724 | } else if (!dentry->d_inode) { |
| 725 | err = -ENODATA; |
| 726 | goto out_file; |
| 727 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 729 | /* Skip directories.. */ |
| 730 | if (S_ISDIR(dentry->d_inode->i_mode)) |
| 731 | goto out_file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 733 | if (!is_reiserfs_priv_object(dentry->d_inode)) { |
| 734 | reiserfs_warning(dir->i_sb, "OID %08x [%.*s/%.*s] doesn't have " |
| 735 | "priv flag set [parent is %sset].", |
| 736 | le32_to_cpu(INODE_PKEY(dentry->d_inode)-> |
| 737 | k_objectid), xadir->d_name.len, |
| 738 | xadir->d_name.name, namelen, name, |
| 739 | is_reiserfs_priv_object(xadir-> |
| 740 | d_inode) ? "" : |
| 741 | "not "); |
| 742 | dput(dentry); |
| 743 | return -EIO; |
| 744 | } |
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 | err = dir->i_op->unlink(dir, dentry); |
| 747 | if (!err) |
| 748 | d_delete(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 750 | out_file: |
| 751 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 753 | out: |
| 754 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | } |
| 756 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 757 | int reiserfs_xattr_del(struct inode *inode, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 759 | struct dentry *dir; |
| 760 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 762 | if (IS_RDONLY(inode)) |
| 763 | return -EROFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 765 | dir = open_xa_dir(inode, FL_READONLY); |
| 766 | if (IS_ERR(dir)) { |
| 767 | err = PTR_ERR(dir); |
| 768 | goto out; |
| 769 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 771 | err = __reiserfs_xattr_del(dir, name, strlen(name)); |
| 772 | dput(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 774 | if (!err) { |
| 775 | inode->i_ctime = CURRENT_TIME_SEC; |
| 776 | mark_inode_dirty(inode); |
| 777 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 779 | out: |
| 780 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | } |
| 782 | |
| 783 | /* The following are side effects of other operations that aren't explicitly |
| 784 | * modifying extended attributes. This includes operations such as permissions |
| 785 | * or ownership changes, object deletions, etc. */ |
| 786 | |
| 787 | static int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 788 | reiserfs_delete_xattrs_filler(void *buf, const char *name, int namelen, |
| 789 | loff_t offset, ino_t ino, unsigned int d_type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 791 | struct dentry *xadir = (struct dentry *)buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 793 | return __reiserfs_xattr_del(xadir, name, namelen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | |
| 795 | } |
| 796 | |
| 797 | /* This is called w/ inode->i_sem downed */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 798 | int reiserfs_delete_xattrs(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 800 | struct file *fp; |
| 801 | struct dentry *dir, *root; |
| 802 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 804 | /* Skip out, an xattr has no xattrs associated with it */ |
| 805 | if (is_reiserfs_priv_object(inode) || |
| 806 | get_inode_sd_version(inode) == STAT_DATA_V1 || |
| 807 | !reiserfs_xattrs(inode->i_sb)) { |
| 808 | return 0; |
| 809 | } |
| 810 | reiserfs_read_lock_xattrs(inode->i_sb); |
| 811 | dir = open_xa_dir(inode, FL_READONLY); |
| 812 | reiserfs_read_unlock_xattrs(inode->i_sb); |
| 813 | if (IS_ERR(dir)) { |
| 814 | err = PTR_ERR(dir); |
| 815 | goto out; |
| 816 | } else if (!dir->d_inode) { |
| 817 | dput(dir); |
| 818 | return 0; |
| 819 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 821 | fp = dentry_open(dir, NULL, O_RDWR); |
| 822 | if (IS_ERR(fp)) { |
| 823 | err = PTR_ERR(fp); |
| 824 | /* dentry_open dputs the dentry if it fails */ |
| 825 | goto out; |
| 826 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 828 | lock_kernel(); |
| 829 | err = xattr_readdir(fp, reiserfs_delete_xattrs_filler, dir); |
| 830 | if (err) { |
| 831 | unlock_kernel(); |
| 832 | goto out_dir; |
| 833 | } |
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 | /* Leftovers besides . and .. -- that's not good. */ |
| 836 | if (dir->d_inode->i_nlink <= 2) { |
| 837 | root = get_xa_root(inode->i_sb); |
| 838 | reiserfs_write_lock_xattrs(inode->i_sb); |
| 839 | err = vfs_rmdir(root->d_inode, dir); |
| 840 | reiserfs_write_unlock_xattrs(inode->i_sb); |
| 841 | dput(root); |
| 842 | } else { |
| 843 | reiserfs_warning(inode->i_sb, |
| 844 | "Couldn't remove all entries in directory"); |
| 845 | } |
| 846 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 848 | out_dir: |
| 849 | fput(fp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 851 | out: |
| 852 | if (!err) |
| 853 | REISERFS_I(inode)->i_flags = |
| 854 | REISERFS_I(inode)->i_flags & ~i_has_xattr_dir; |
| 855 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | } |
| 857 | |
| 858 | struct reiserfs_chown_buf { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 859 | struct inode *inode; |
| 860 | struct dentry *xadir; |
| 861 | struct iattr *attrs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | }; |
| 863 | |
| 864 | /* XXX: If there is a better way to do this, I'd love to hear about it */ |
| 865 | static int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 866 | reiserfs_chown_xattrs_filler(void *buf, const char *name, int namelen, |
| 867 | loff_t offset, ino_t ino, unsigned int d_type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 869 | struct reiserfs_chown_buf *chown_buf = (struct reiserfs_chown_buf *)buf; |
| 870 | struct dentry *xafile, *xadir = chown_buf->xadir; |
| 871 | struct iattr *attrs = chown_buf->attrs; |
| 872 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 874 | xafile = lookup_one_len(name, xadir, namelen); |
| 875 | if (IS_ERR(xafile)) |
| 876 | return PTR_ERR(xafile); |
| 877 | else if (!xafile->d_inode) { |
| 878 | dput(xafile); |
| 879 | return -ENODATA; |
| 880 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 882 | if (!S_ISDIR(xafile->d_inode->i_mode)) |
| 883 | err = notify_change(xafile, attrs); |
| 884 | dput(xafile); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 886 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | } |
| 888 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 889 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 891 | struct file *fp; |
| 892 | struct dentry *dir; |
| 893 | int err = 0; |
| 894 | struct reiserfs_chown_buf buf; |
| 895 | unsigned int ia_valid = attrs->ia_valid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 897 | /* Skip out, an xattr has no xattrs associated with it */ |
| 898 | if (is_reiserfs_priv_object(inode) || |
| 899 | get_inode_sd_version(inode) == STAT_DATA_V1 || |
| 900 | !reiserfs_xattrs(inode->i_sb)) { |
| 901 | return 0; |
| 902 | } |
| 903 | reiserfs_read_lock_xattrs(inode->i_sb); |
| 904 | dir = open_xa_dir(inode, FL_READONLY); |
| 905 | reiserfs_read_unlock_xattrs(inode->i_sb); |
| 906 | if (IS_ERR(dir)) { |
| 907 | if (PTR_ERR(dir) != -ENODATA) |
| 908 | err = PTR_ERR(dir); |
| 909 | goto out; |
| 910 | } else if (!dir->d_inode) { |
| 911 | dput(dir); |
| 912 | goto out; |
| 913 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 915 | fp = dentry_open(dir, NULL, O_RDWR); |
| 916 | if (IS_ERR(fp)) { |
| 917 | err = PTR_ERR(fp); |
| 918 | /* dentry_open dputs the dentry if it fails */ |
| 919 | goto out; |
| 920 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 922 | lock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 924 | attrs->ia_valid &= (ATTR_UID | ATTR_GID | ATTR_CTIME); |
| 925 | buf.xadir = dir; |
| 926 | buf.attrs = attrs; |
| 927 | buf.inode = inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 929 | err = xattr_readdir(fp, reiserfs_chown_xattrs_filler, &buf); |
| 930 | if (err) { |
| 931 | unlock_kernel(); |
| 932 | goto out_dir; |
| 933 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 935 | err = notify_change(dir, attrs); |
| 936 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 938 | out_dir: |
| 939 | fput(fp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 941 | out: |
| 942 | attrs->ia_valid = ia_valid; |
| 943 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | } |
| 945 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | /* Actual operations that are exported to VFS-land */ |
| 947 | |
| 948 | /* |
| 949 | * Inode operation getxattr() |
| 950 | * Preliminary locking: we down dentry->d_inode->i_sem |
| 951 | */ |
| 952 | ssize_t |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 953 | reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, |
| 954 | size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 956 | struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(name); |
| 957 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 959 | if (!xah || !reiserfs_xattrs(dentry->d_sb) || |
| 960 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
| 961 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 963 | reiserfs_read_lock_xattr_i(dentry->d_inode); |
| 964 | reiserfs_read_lock_xattrs(dentry->d_sb); |
| 965 | err = xah->get(dentry->d_inode, name, buffer, size); |
| 966 | reiserfs_read_unlock_xattrs(dentry->d_sb); |
| 967 | reiserfs_read_unlock_xattr_i(dentry->d_inode); |
| 968 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | } |
| 970 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | /* |
| 972 | * Inode operation setxattr() |
| 973 | * |
| 974 | * dentry->d_inode->i_sem down |
| 975 | */ |
| 976 | int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 977 | reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
| 978 | size_t size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 980 | struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(name); |
| 981 | int err; |
| 982 | int lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 984 | if (!xah || !reiserfs_xattrs(dentry->d_sb) || |
| 985 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
| 986 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 988 | if (IS_RDONLY(dentry->d_inode)) |
| 989 | return -EROFS; |
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 | if (IS_IMMUTABLE(dentry->d_inode) || IS_APPEND(dentry->d_inode)) |
| 992 | return -EROFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 994 | reiserfs_write_lock_xattr_i(dentry->d_inode); |
| 995 | lock = !has_xattr_dir(dentry->d_inode); |
| 996 | if (lock) |
| 997 | reiserfs_write_lock_xattrs(dentry->d_sb); |
| 998 | else |
| 999 | reiserfs_read_lock_xattrs(dentry->d_sb); |
| 1000 | err = xah->set(dentry->d_inode, name, value, size, flags); |
| 1001 | if (lock) |
| 1002 | reiserfs_write_unlock_xattrs(dentry->d_sb); |
| 1003 | else |
| 1004 | reiserfs_read_unlock_xattrs(dentry->d_sb); |
| 1005 | reiserfs_write_unlock_xattr_i(dentry->d_inode); |
| 1006 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | } |
| 1008 | |
| 1009 | /* |
| 1010 | * Inode operation removexattr() |
| 1011 | * |
| 1012 | * dentry->d_inode->i_sem down |
| 1013 | */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1014 | int reiserfs_removexattr(struct dentry *dentry, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1016 | int err; |
| 1017 | struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(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 | if (!xah || !reiserfs_xattrs(dentry->d_sb) || |
| 1020 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
| 1021 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1023 | if (IS_RDONLY(dentry->d_inode)) |
| 1024 | return -EROFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1026 | if (IS_IMMUTABLE(dentry->d_inode) || IS_APPEND(dentry->d_inode)) |
| 1027 | return -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1029 | reiserfs_write_lock_xattr_i(dentry->d_inode); |
| 1030 | reiserfs_read_lock_xattrs(dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1032 | /* Deletion pre-operation */ |
| 1033 | if (xah->del) { |
| 1034 | err = xah->del(dentry->d_inode, name); |
| 1035 | if (err) |
| 1036 | goto out; |
| 1037 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1039 | err = reiserfs_xattr_del(dentry->d_inode, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1041 | dentry->d_inode->i_ctime = CURRENT_TIME_SEC; |
| 1042 | mark_inode_dirty(dentry->d_inode); |
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 | out: |
| 1045 | reiserfs_read_unlock_xattrs(dentry->d_sb); |
| 1046 | reiserfs_write_unlock_xattr_i(dentry->d_inode); |
| 1047 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | } |
| 1049 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | /* This is what filldir will use: |
| 1051 | * r_pos will always contain the amount of space required for the entire |
| 1052 | * list. If r_pos becomes larger than r_size, we need more space and we |
| 1053 | * return an error indicating this. If r_pos is less than r_size, then we've |
| 1054 | * filled the buffer successfully and we return success */ |
| 1055 | struct reiserfs_listxattr_buf { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1056 | int r_pos; |
| 1057 | int r_size; |
| 1058 | char *r_buf; |
| 1059 | struct inode *r_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | }; |
| 1061 | |
| 1062 | static int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1063 | reiserfs_listxattr_filler(void *buf, const char *name, int namelen, |
| 1064 | loff_t offset, ino_t ino, unsigned int d_type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1066 | struct reiserfs_listxattr_buf *b = (struct reiserfs_listxattr_buf *)buf; |
| 1067 | int len = 0; |
| 1068 | if (name[0] != '.' |
| 1069 | || (namelen != 1 && (name[1] != '.' || namelen != 2))) { |
| 1070 | struct reiserfs_xattr_handler *xah = |
| 1071 | find_xattr_handler_prefix(name); |
| 1072 | if (!xah) |
| 1073 | return 0; /* Unsupported xattr name, skip it */ |
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 | /* We call ->list() twice because the operation isn't required to just |
| 1076 | * return the name back - we want to make sure we have enough space */ |
| 1077 | len += xah->list(b->r_inode, name, namelen, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1079 | if (len) { |
| 1080 | if (b->r_pos + len + 1 <= b->r_size) { |
| 1081 | char *p = b->r_buf + b->r_pos; |
| 1082 | p += xah->list(b->r_inode, name, namelen, p); |
| 1083 | *p++ = '\0'; |
| 1084 | } |
| 1085 | b->r_pos += len + 1; |
| 1086 | } |
| 1087 | } |
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 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | } |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1091 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | /* |
| 1093 | * Inode operation listxattr() |
| 1094 | * |
| 1095 | * Preliminary locking: we down dentry->d_inode->i_sem |
| 1096 | */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1097 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1099 | struct file *fp; |
| 1100 | struct dentry *dir; |
| 1101 | int err = 0; |
| 1102 | struct reiserfs_listxattr_buf buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1104 | if (!dentry->d_inode) |
| 1105 | return -EINVAL; |
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 | if (!reiserfs_xattrs(dentry->d_sb) || |
| 1108 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
| 1109 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1111 | reiserfs_read_lock_xattr_i(dentry->d_inode); |
| 1112 | reiserfs_read_lock_xattrs(dentry->d_sb); |
| 1113 | dir = open_xa_dir(dentry->d_inode, FL_READONLY); |
| 1114 | reiserfs_read_unlock_xattrs(dentry->d_sb); |
| 1115 | if (IS_ERR(dir)) { |
| 1116 | err = PTR_ERR(dir); |
| 1117 | if (err == -ENODATA) |
| 1118 | err = 0; /* Not an error if there aren't any xattrs */ |
| 1119 | goto out; |
| 1120 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1122 | fp = dentry_open(dir, NULL, O_RDWR); |
| 1123 | if (IS_ERR(fp)) { |
| 1124 | err = PTR_ERR(fp); |
| 1125 | /* dentry_open dputs the dentry if it fails */ |
| 1126 | goto out; |
| 1127 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1129 | buf.r_buf = buffer; |
| 1130 | buf.r_size = buffer ? size : 0; |
| 1131 | buf.r_pos = 0; |
| 1132 | buf.r_inode = dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1134 | REISERFS_I(dentry->d_inode)->i_flags |= i_has_xattr_dir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1136 | err = xattr_readdir(fp, reiserfs_listxattr_filler, &buf); |
| 1137 | if (err) |
| 1138 | goto out_dir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1140 | if (buf.r_pos > buf.r_size && buffer != NULL) |
| 1141 | err = -ERANGE; |
| 1142 | else |
| 1143 | err = buf.r_pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1145 | out_dir: |
| 1146 | fput(fp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1148 | out: |
| 1149 | reiserfs_read_unlock_xattr_i(dentry->d_inode); |
| 1150 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | } |
| 1152 | |
| 1153 | /* This is the implementation for the xattr plugin infrastructure */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1154 | static struct list_head xattr_handlers = LIST_HEAD_INIT(xattr_handlers); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | static DEFINE_RWLOCK(handler_lock); |
| 1156 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1157 | static struct reiserfs_xattr_handler *find_xattr_handler_prefix(const char |
| 1158 | *prefix) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1160 | struct reiserfs_xattr_handler *xah = NULL; |
| 1161 | struct list_head *p; |
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 | read_lock(&handler_lock); |
| 1164 | list_for_each(p, &xattr_handlers) { |
| 1165 | xah = list_entry(p, struct reiserfs_xattr_handler, handlers); |
| 1166 | if (strncmp(xah->prefix, prefix, strlen(xah->prefix)) == 0) |
| 1167 | break; |
| 1168 | xah = NULL; |
| 1169 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1171 | read_unlock(&handler_lock); |
| 1172 | return xah; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | } |
| 1174 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1175 | static void __unregister_handlers(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1177 | struct reiserfs_xattr_handler *xah; |
| 1178 | struct list_head *p, *tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1180 | list_for_each_safe(p, tmp, &xattr_handlers) { |
| 1181 | xah = list_entry(p, struct reiserfs_xattr_handler, handlers); |
| 1182 | if (xah->exit) |
| 1183 | xah->exit(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1185 | list_del_init(p); |
| 1186 | } |
| 1187 | INIT_LIST_HEAD(&xattr_handlers); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | } |
| 1189 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1190 | int __init reiserfs_xattr_register_handlers(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1192 | int err = 0; |
| 1193 | struct reiserfs_xattr_handler *xah; |
| 1194 | struct list_head *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1196 | write_lock(&handler_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1198 | /* If we're already initialized, nothing to do */ |
| 1199 | if (!list_empty(&xattr_handlers)) { |
| 1200 | write_unlock(&handler_lock); |
| 1201 | return 0; |
| 1202 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1204 | /* Add the handlers */ |
| 1205 | list_add_tail(&user_handler.handlers, &xattr_handlers); |
| 1206 | list_add_tail(&trusted_handler.handlers, &xattr_handlers); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | #ifdef CONFIG_REISERFS_FS_SECURITY |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1208 | list_add_tail(&security_handler.handlers, &xattr_handlers); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | #endif |
| 1210 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1211 | list_add_tail(&posix_acl_access_handler.handlers, &xattr_handlers); |
| 1212 | list_add_tail(&posix_acl_default_handler.handlers, &xattr_handlers); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | #endif |
| 1214 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1215 | /* Run initializers, if available */ |
| 1216 | list_for_each(p, &xattr_handlers) { |
| 1217 | xah = list_entry(p, struct reiserfs_xattr_handler, handlers); |
| 1218 | if (xah->init) { |
| 1219 | err = xah->init(); |
| 1220 | if (err) { |
| 1221 | list_del_init(p); |
| 1222 | break; |
| 1223 | } |
| 1224 | } |
| 1225 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1227 | /* Clean up other handlers, if any failed */ |
| 1228 | if (err) |
| 1229 | __unregister_handlers(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1230 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1231 | write_unlock(&handler_lock); |
| 1232 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | } |
| 1234 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1235 | void reiserfs_xattr_unregister_handlers(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1237 | write_lock(&handler_lock); |
| 1238 | __unregister_handlers(); |
| 1239 | write_unlock(&handler_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | } |
| 1241 | |
| 1242 | /* This will catch lookups from the fs root to .reiserfs_priv */ |
| 1243 | static int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1244 | xattr_lookup_poison(struct dentry *dentry, struct qstr *q1, struct qstr *name) |
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 | struct dentry *priv_root = REISERFS_SB(dentry->d_sb)->priv_root; |
| 1247 | if (name->len == priv_root->d_name.len && |
| 1248 | name->hash == priv_root->d_name.hash && |
| 1249 | !memcmp(name->name, priv_root->d_name.name, name->len)) { |
| 1250 | return -ENOENT; |
| 1251 | } else if (q1->len == name->len && |
| 1252 | !memcmp(q1->name, name->name, name->len)) |
| 1253 | return 0; |
| 1254 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | } |
| 1256 | |
| 1257 | static struct dentry_operations xattr_lookup_poison_ops = { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1258 | .d_compare = xattr_lookup_poison, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | }; |
| 1260 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | /* We need to take a copy of the mount flags since things like |
| 1262 | * MS_RDONLY don't get set until *after* we're called. |
| 1263 | * mount_flags != mount_options */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1264 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1266 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1268 | /* We need generation numbers to ensure that the oid mapping is correct |
| 1269 | * v3.5 filesystems don't have them. */ |
| 1270 | if (!old_format_only(s)) { |
| 1271 | set_bit(REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt)); |
| 1272 | } else if (reiserfs_xattrs_optional(s)) { |
| 1273 | /* Old format filesystem, but optional xattrs have been enabled |
| 1274 | * at mount time. Error out. */ |
| 1275 | reiserfs_warning(s, "xattrs/ACLs not supported on pre v3.6 " |
| 1276 | "format filesystem. Failing mount."); |
| 1277 | err = -EOPNOTSUPP; |
| 1278 | goto error; |
| 1279 | } else { |
| 1280 | /* Old format filesystem, but no optional xattrs have been enabled. This |
| 1281 | * means we silently disable xattrs on the filesystem. */ |
| 1282 | clear_bit(REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt)); |
| 1283 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1285 | /* If we don't have the privroot located yet - go find it */ |
| 1286 | if (reiserfs_xattrs(s) && !REISERFS_SB(s)->priv_root) { |
| 1287 | struct dentry *dentry; |
| 1288 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, |
| 1289 | strlen(PRIVROOT_NAME)); |
| 1290 | if (!IS_ERR(dentry)) { |
| 1291 | if (!(mount_flags & MS_RDONLY) && !dentry->d_inode) { |
| 1292 | struct inode *inode = dentry->d_parent->d_inode; |
| 1293 | down(&inode->i_sem); |
| 1294 | err = inode->i_op->mkdir(inode, dentry, 0700); |
| 1295 | up(&inode->i_sem); |
| 1296 | if (err) { |
| 1297 | dput(dentry); |
| 1298 | dentry = NULL; |
| 1299 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1301 | if (dentry && dentry->d_inode) |
| 1302 | reiserfs_warning(s, |
| 1303 | "Created %s on %s - reserved for " |
| 1304 | "xattr storage.", |
| 1305 | PRIVROOT_NAME, |
| 1306 | reiserfs_bdevname |
| 1307 | (inode->i_sb)); |
| 1308 | } else if (!dentry->d_inode) { |
| 1309 | dput(dentry); |
| 1310 | dentry = NULL; |
| 1311 | } |
| 1312 | } else |
| 1313 | err = PTR_ERR(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1314 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1315 | if (!err && dentry) { |
| 1316 | s->s_root->d_op = &xattr_lookup_poison_ops; |
| 1317 | reiserfs_mark_inode_private(dentry->d_inode); |
| 1318 | REISERFS_SB(s)->priv_root = dentry; |
| 1319 | } else if (!(mount_flags & MS_RDONLY)) { /* xattrs are unavailable */ |
| 1320 | /* If we're read-only it just means that the dir hasn't been |
| 1321 | * created. Not an error -- just no xattrs on the fs. We'll |
| 1322 | * check again if we go read-write */ |
| 1323 | reiserfs_warning(s, "xattrs/ACLs enabled and couldn't " |
| 1324 | "find/create .reiserfs_priv. Failing mount."); |
| 1325 | err = -EOPNOTSUPP; |
| 1326 | } |
| 1327 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1328 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1329 | error: |
| 1330 | /* This is only nonzero if there was an error initializing the xattr |
| 1331 | * directory or if there is a condition where we don't support them. */ |
| 1332 | if (err) { |
| 1333 | clear_bit(REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt)); |
| 1334 | clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt)); |
| 1335 | clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt)); |
| 1336 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1338 | /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */ |
| 1339 | s->s_flags = s->s_flags & ~MS_POSIXACL; |
| 1340 | if (reiserfs_posixacl(s)) |
| 1341 | s->s_flags |= MS_POSIXACL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1343 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | } |
| 1345 | |
| 1346 | static int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1347 | __reiserfs_permission(struct inode *inode, int mask, struct nameidata *nd, |
| 1348 | int need_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1350 | umode_t mode = inode->i_mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | |
| 1352 | if (mask & MAY_WRITE) { |
| 1353 | /* |
| 1354 | * Nobody gets write access to a read-only fs. |
| 1355 | */ |
| 1356 | if (IS_RDONLY(inode) && |
| 1357 | (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) |
| 1358 | return -EROFS; |
| 1359 | |
| 1360 | /* |
| 1361 | * Nobody gets write access to an immutable file. |
| 1362 | */ |
| 1363 | if (IS_IMMUTABLE(inode)) |
| 1364 | return -EACCES; |
| 1365 | } |
| 1366 | |
| 1367 | /* We don't do permission checks on the internal objects. |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1368 | * Permissions are determined by the "owning" object. */ |
| 1369 | if (is_reiserfs_priv_object(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | return 0; |
| 1371 | |
| 1372 | if (current->fsuid == inode->i_uid) { |
| 1373 | mode >>= 6; |
| 1374 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL |
| 1375 | } else if (reiserfs_posixacl(inode->i_sb) && |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1376 | get_inode_sd_version(inode) != STAT_DATA_V1) { |
| 1377 | struct posix_acl *acl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | |
| 1379 | /* ACL can't contain additional permissions if |
| 1380 | the ACL_MASK entry is 0 */ |
| 1381 | if (!(mode & S_IRWXG)) |
| 1382 | goto check_groups; |
| 1383 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1384 | if (need_lock) { |
| 1385 | reiserfs_read_lock_xattr_i(inode); |
| 1386 | reiserfs_read_lock_xattrs(inode->i_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | } |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1388 | acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS); |
| 1389 | if (need_lock) { |
| 1390 | reiserfs_read_unlock_xattrs(inode->i_sb); |
| 1391 | reiserfs_read_unlock_xattr_i(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1392 | } |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1393 | if (IS_ERR(acl)) { |
| 1394 | if (PTR_ERR(acl) == -ENODATA) |
| 1395 | goto check_groups; |
| 1396 | return PTR_ERR(acl); |
| 1397 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1399 | if (acl) { |
| 1400 | int err = posix_acl_permission(inode, acl, mask); |
| 1401 | posix_acl_release(acl); |
| 1402 | if (err == -EACCES) { |
| 1403 | goto check_capabilities; |
| 1404 | } |
| 1405 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | } else { |
| 1407 | goto check_groups; |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1408 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | #endif |
| 1410 | } else { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1411 | check_groups: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | if (in_group_p(inode->i_gid)) |
| 1413 | mode >>= 3; |
| 1414 | } |
| 1415 | |
| 1416 | /* |
| 1417 | * If the DACs are ok we don't need any capability check. |
| 1418 | */ |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1419 | if (((mode & mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == mask)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1420 | return 0; |
| 1421 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1422 | check_capabilities: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | /* |
| 1424 | * Read/write DACs are always overridable. |
| 1425 | * Executable DACs are overridable if at least one exec bit is set. |
| 1426 | */ |
| 1427 | if (!(mask & MAY_EXEC) || |
| 1428 | (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode)) |
| 1429 | if (capable(CAP_DAC_OVERRIDE)) |
| 1430 | return 0; |
| 1431 | |
| 1432 | /* |
| 1433 | * Searching includes executable on directories, else just read. |
| 1434 | */ |
| 1435 | if (mask == MAY_READ || (S_ISDIR(inode->i_mode) && !(mask & MAY_WRITE))) |
| 1436 | if (capable(CAP_DAC_READ_SEARCH)) |
| 1437 | return 0; |
| 1438 | |
| 1439 | return -EACCES; |
| 1440 | } |
| 1441 | |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1442 | int reiserfs_permission(struct inode *inode, int mask, struct nameidata *nd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1444 | return __reiserfs_permission(inode, mask, nd, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1445 | } |
| 1446 | |
| 1447 | int |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1448 | reiserfs_permission_locked(struct inode *inode, int mask, struct nameidata *nd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | { |
Linus Torvalds | bd4c625 | 2005-07-12 20:21:28 -0700 | [diff] [blame^] | 1450 | return __reiserfs_permission(inode, mask, nd, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | } |