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Commit | Line | Data |
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1da177e4 LT |
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> | |
16f7e0fe | 33 | #include <linux/capability.h> |
1da177e4 LT |
34 | #include <linux/dcache.h> |
35 | #include <linux/namei.h> | |
36 | #include <linux/errno.h> | |
37 | #include <linux/fs.h> | |
38 | #include <linux/file.h> | |
39 | #include <linux/pagemap.h> | |
40 | #include <linux/xattr.h> | |
41 | #include <linux/reiserfs_xattr.h> | |
42 | #include <linux/reiserfs_acl.h> | |
1da177e4 | 43 | #include <asm/uaccess.h> |
3277c39f | 44 | #include <net/checksum.h> |
1da177e4 LT |
45 | #include <linux/smp_lock.h> |
46 | #include <linux/stat.h> | |
1da177e4 LT |
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 | ||
bd4c625c LT |
53 | static struct reiserfs_xattr_handler *find_xattr_handler_prefix(const char |
54 | *prefix); | |
1da177e4 | 55 | |
9b7f3755 JM |
56 | /* Returns the dentry referring to the root of the extended attribute |
57 | * directory tree. If it has already been retrieved, it is used. If it | |
58 | * hasn't been created and the flags indicate creation is allowed, we | |
59 | * attempt to create it. On error, we return a pointer-encoded error. | |
60 | */ | |
61 | static struct dentry *get_xa_root(struct super_block *sb, int flags) | |
1da177e4 | 62 | { |
bd4c625c LT |
63 | struct dentry *privroot = dget(REISERFS_SB(sb)->priv_root); |
64 | struct dentry *xaroot; | |
65 | ||
66 | /* This needs to be created at mount-time */ | |
67 | if (!privroot) | |
9b7f3755 | 68 | return ERR_PTR(-ENODATA); |
bd4c625c | 69 | |
1173a729 | 70 | mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR); |
9b7f3755 JM |
71 | if (REISERFS_SB(sb)->xattr_root) { |
72 | xaroot = dget(REISERFS_SB(sb)->xattr_root); | |
bd4c625c | 73 | goto out; |
bd4c625c LT |
74 | } |
75 | ||
bd4c625c LT |
76 | xaroot = lookup_one_len(XAROOT_NAME, privroot, strlen(XAROOT_NAME)); |
77 | if (IS_ERR(xaroot)) { | |
78 | goto out; | |
79 | } else if (!xaroot->d_inode) { | |
9b7f3755 JM |
80 | int err = -ENODATA; |
81 | if (flags == 0 || flags & XATTR_CREATE) | |
82 | err = privroot->d_inode->i_op->mkdir(privroot->d_inode, | |
83 | xaroot, 0700); | |
84 | if (err) { | |
85 | dput(xaroot); | |
86 | xaroot = ERR_PTR(err); | |
87 | goto out; | |
88 | } | |
bd4c625c | 89 | } |
9b7f3755 | 90 | REISERFS_SB(sb)->xattr_root = dget(xaroot); |
bd4c625c LT |
91 | |
92 | out: | |
9b7f3755 | 93 | mutex_unlock(&privroot->d_inode->i_mutex); |
bd4c625c LT |
94 | dput(privroot); |
95 | return xaroot; | |
1da177e4 LT |
96 | } |
97 | ||
1da177e4 LT |
98 | /* Opens the directory corresponding to the inode's extended attribute store. |
99 | * If flags allow, the tree to the directory may be created. If creation is | |
100 | * prohibited, -ENODATA is returned. */ | |
bd4c625c | 101 | static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
1da177e4 | 102 | { |
bd4c625c LT |
103 | struct dentry *xaroot, *xadir; |
104 | char namebuf[17]; | |
105 | ||
9b7f3755 JM |
106 | xaroot = get_xa_root(inode->i_sb, flags); |
107 | if (IS_ERR(xaroot)) | |
bd4c625c | 108 | return xaroot; |
bd4c625c LT |
109 | |
110 | /* ok, we have xaroot open */ | |
bd4c625c LT |
111 | snprintf(namebuf, sizeof(namebuf), "%X.%X", |
112 | le32_to_cpu(INODE_PKEY(inode)->k_objectid), | |
113 | inode->i_generation); | |
114 | xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf)); | |
115 | if (IS_ERR(xadir)) { | |
116 | dput(xaroot); | |
117 | return xadir; | |
118 | } | |
119 | ||
120 | if (!xadir->d_inode) { | |
121 | int err; | |
122 | if (flags == 0 || flags & XATTR_CREATE) { | |
123 | /* Although there is nothing else trying to create this directory, | |
124 | * another directory with the same hash may be created, so we need | |
125 | * to protect against that */ | |
126 | err = | |
127 | xaroot->d_inode->i_op->mkdir(xaroot->d_inode, xadir, | |
128 | 0700); | |
129 | if (err) { | |
130 | dput(xaroot); | |
131 | dput(xadir); | |
132 | return ERR_PTR(err); | |
133 | } | |
134 | } | |
135 | if (!xadir->d_inode) { | |
136 | dput(xaroot); | |
137 | dput(xadir); | |
138 | return ERR_PTR(-ENODATA); | |
139 | } | |
140 | } | |
141 | ||
142 | dput(xaroot); | |
143 | return xadir; | |
1da177e4 LT |
144 | } |
145 | ||
146 | /* Returns a dentry corresponding to a specific extended attribute file | |
147 | * for the inode. If flags allow, the file is created. Otherwise, a | |
148 | * valid or negative dentry, or an error is returned. */ | |
bd4c625c LT |
149 | static struct dentry *get_xa_file_dentry(const struct inode *inode, |
150 | const char *name, int flags) | |
1da177e4 | 151 | { |
bd4c625c LT |
152 | struct dentry *xadir, *xafile; |
153 | int err = 0; | |
154 | ||
155 | xadir = open_xa_dir(inode, flags); | |
156 | if (IS_ERR(xadir)) { | |
e231c2ee | 157 | return ERR_CAST(xadir); |
67b172c0 | 158 | } else if (!xadir->d_inode) { |
bd4c625c LT |
159 | dput(xadir); |
160 | return ERR_PTR(-ENODATA); | |
161 | } | |
162 | ||
163 | xafile = lookup_one_len(name, xadir, strlen(name)); | |
164 | if (IS_ERR(xafile)) { | |
165 | dput(xadir); | |
e231c2ee | 166 | return ERR_CAST(xafile); |
bd4c625c LT |
167 | } |
168 | ||
169 | if (xafile->d_inode) { /* file exists */ | |
170 | if (flags & XATTR_CREATE) { | |
171 | err = -EEXIST; | |
172 | dput(xafile); | |
173 | goto out; | |
174 | } | |
175 | } else if (flags & XATTR_REPLACE || flags & FL_READONLY) { | |
176 | goto out; | |
177 | } else { | |
1b1dcc1b | 178 | /* inode->i_mutex is down, so nothing else can try to create |
bd4c625c LT |
179 | * the same xattr */ |
180 | err = xadir->d_inode->i_op->create(xadir->d_inode, xafile, | |
181 | 0700 | S_IFREG, NULL); | |
182 | ||
183 | if (err) { | |
184 | dput(xafile); | |
185 | goto out; | |
186 | } | |
187 | } | |
1da177e4 | 188 | |
bd4c625c LT |
189 | out: |
190 | dput(xadir); | |
191 | if (err) | |
192 | xafile = ERR_PTR(err); | |
bd4c625c LT |
193 | else if (!xafile->d_inode) { |
194 | dput(xafile); | |
3227e14c | 195 | xafile = ERR_PTR(-ENODATA); |
bd4c625c | 196 | } |
3227e14c | 197 | return xafile; |
1da177e4 LT |
198 | } |
199 | ||
1da177e4 LT |
200 | /* |
201 | * this is very similar to fs/reiserfs/dir.c:reiserfs_readdir, but | |
202 | * we need to drop the path before calling the filldir struct. That | |
203 | * would be a big performance hit to the non-xattr case, so I've copied | |
204 | * the whole thing for now. --clm | |
205 | * | |
206 | * the big difference is that I go backwards through the directory, | |
207 | * and don't mess with f->f_pos, but the idea is the same. Do some | |
208 | * action on each and every entry in the directory. | |
209 | * | |
1b1dcc1b | 210 | * we're called with i_mutex held, so there are no worries about the directory |
1da177e4 LT |
211 | * changing underneath us. |
212 | */ | |
3227e14c | 213 | static int __xattr_readdir(struct inode *inode, void *dirent, filldir_t filldir) |
1da177e4 | 214 | { |
bd4c625c LT |
215 | struct cpu_key pos_key; /* key of current position in the directory (key of directory entry) */ |
216 | INITIALIZE_PATH(path_to_entry); | |
217 | struct buffer_head *bh; | |
218 | int entry_num; | |
219 | struct item_head *ih, tmp_ih; | |
220 | int search_res; | |
221 | char *local_buf; | |
222 | loff_t next_pos; | |
223 | char small_buf[32]; /* avoid kmalloc if we can */ | |
224 | struct reiserfs_de_head *deh; | |
225 | int d_reclen; | |
226 | char *d_name; | |
227 | off_t d_off; | |
228 | ino_t d_ino; | |
229 | struct reiserfs_dir_entry de; | |
230 | ||
231 | /* form key for search the next directory entry using f_pos field of | |
232 | file structure */ | |
233 | next_pos = max_reiserfs_offset(inode); | |
234 | ||
235 | while (1) { | |
236 | research: | |
237 | if (next_pos <= DOT_DOT_OFFSET) | |
238 | break; | |
239 | make_cpu_key(&pos_key, inode, next_pos, TYPE_DIRENTRY, 3); | |
240 | ||
241 | search_res = | |
242 | search_by_entry_key(inode->i_sb, &pos_key, &path_to_entry, | |
243 | &de); | |
244 | if (search_res == IO_ERROR) { | |
245 | // FIXME: we could just skip part of directory which could | |
246 | // not be read | |
247 | pathrelse(&path_to_entry); | |
248 | return -EIO; | |
249 | } | |
1da177e4 | 250 | |
bd4c625c LT |
251 | if (search_res == NAME_NOT_FOUND) |
252 | de.de_entry_num--; | |
1da177e4 | 253 | |
bd4c625c LT |
254 | set_de_name_and_namelen(&de); |
255 | entry_num = de.de_entry_num; | |
256 | deh = &(de.de_deh[entry_num]); | |
1da177e4 | 257 | |
bd4c625c LT |
258 | bh = de.de_bh; |
259 | ih = de.de_ih; | |
1da177e4 | 260 | |
bd4c625c | 261 | if (!is_direntry_le_ih(ih)) { |
0030b645 JM |
262 | reiserfs_error(inode->i_sb, "jdm-20000", |
263 | "not direntry %h", ih); | |
bd4c625c LT |
264 | break; |
265 | } | |
266 | copy_item_head(&tmp_ih, ih); | |
1da177e4 | 267 | |
bd4c625c LT |
268 | /* we must have found item, that is item of this directory, */ |
269 | RFALSE(COMP_SHORT_KEYS(&(ih->ih_key), &pos_key), | |
270 | "vs-9000: found item %h does not match to dir we readdir %K", | |
271 | ih, &pos_key); | |
1da177e4 | 272 | |
bd4c625c LT |
273 | if (deh_offset(deh) <= DOT_DOT_OFFSET) { |
274 | break; | |
275 | } | |
1da177e4 | 276 | |
bd4c625c LT |
277 | /* look for the previous entry in the directory */ |
278 | next_pos = deh_offset(deh) - 1; | |
1da177e4 | 279 | |
bd4c625c LT |
280 | if (!de_visible(deh)) |
281 | /* it is hidden entry */ | |
282 | continue; | |
1da177e4 | 283 | |
bd4c625c LT |
284 | d_reclen = entry_length(bh, ih, entry_num); |
285 | d_name = B_I_DEH_ENTRY_FILE_NAME(bh, ih, deh); | |
286 | d_off = deh_offset(deh); | |
287 | d_ino = deh_objectid(deh); | |
1da177e4 | 288 | |
bd4c625c LT |
289 | if (!d_name[d_reclen - 1]) |
290 | d_reclen = strlen(d_name); | |
1da177e4 | 291 | |
bd4c625c LT |
292 | if (d_reclen > REISERFS_MAX_NAME(inode->i_sb->s_blocksize)) { |
293 | /* too big to send back to VFS */ | |
294 | continue; | |
295 | } | |
1da177e4 | 296 | |
bd4c625c LT |
297 | /* Ignore the .reiserfs_priv entry */ |
298 | if (reiserfs_xattrs(inode->i_sb) && | |
299 | !old_format_only(inode->i_sb) && | |
300 | deh_objectid(deh) == | |
301 | le32_to_cpu(INODE_PKEY | |
302 | (REISERFS_SB(inode->i_sb)->priv_root->d_inode)-> | |
303 | k_objectid)) | |
304 | continue; | |
305 | ||
306 | if (d_reclen <= 32) { | |
307 | local_buf = small_buf; | |
308 | } else { | |
d739b42b | 309 | local_buf = kmalloc(d_reclen, GFP_NOFS); |
bd4c625c LT |
310 | if (!local_buf) { |
311 | pathrelse(&path_to_entry); | |
312 | return -ENOMEM; | |
313 | } | |
314 | if (item_moved(&tmp_ih, &path_to_entry)) { | |
d739b42b | 315 | kfree(local_buf); |
bd4c625c LT |
316 | |
317 | /* sigh, must retry. Do this same offset again */ | |
318 | next_pos = d_off; | |
319 | goto research; | |
320 | } | |
321 | } | |
1da177e4 | 322 | |
bd4c625c LT |
323 | // Note, that we copy name to user space via temporary |
324 | // buffer (local_buf) because filldir will block if | |
325 | // user space buffer is swapped out. At that time | |
326 | // entry can move to somewhere else | |
327 | memcpy(local_buf, d_name, d_reclen); | |
1da177e4 | 328 | |
bd4c625c LT |
329 | /* the filldir function might need to start transactions, |
330 | * or do who knows what. Release the path now that we've | |
331 | * copied all the important stuff out of the deh | |
332 | */ | |
333 | pathrelse(&path_to_entry); | |
334 | ||
335 | if (filldir(dirent, local_buf, d_reclen, d_off, d_ino, | |
336 | DT_UNKNOWN) < 0) { | |
337 | if (local_buf != small_buf) { | |
d739b42b | 338 | kfree(local_buf); |
bd4c625c LT |
339 | } |
340 | goto end; | |
341 | } | |
342 | if (local_buf != small_buf) { | |
d739b42b | 343 | kfree(local_buf); |
bd4c625c LT |
344 | } |
345 | } /* while */ | |
1da177e4 | 346 | |
bd4c625c LT |
347 | end: |
348 | pathrelse(&path_to_entry); | |
349 | return 0; | |
1da177e4 LT |
350 | } |
351 | ||
352 | /* | |
353 | * this could be done with dedicated readdir ops for the xattr files, | |
354 | * but I want to get something working asap | |
355 | * this is stolen from vfs_readdir | |
356 | * | |
357 | */ | |
358 | static | |
3227e14c | 359 | int xattr_readdir(struct inode *inode, filldir_t filler, void *buf) |
1da177e4 | 360 | { |
3227e14c | 361 | int res = -ENOENT; |
4df46240 | 362 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_XATTR); |
bd4c625c LT |
363 | if (!IS_DEADDIR(inode)) { |
364 | lock_kernel(); | |
3227e14c | 365 | res = __xattr_readdir(inode, buf, filler); |
bd4c625c LT |
366 | unlock_kernel(); |
367 | } | |
1b1dcc1b | 368 | mutex_unlock(&inode->i_mutex); |
bd4c625c | 369 | return res; |
1da177e4 LT |
370 | } |
371 | ||
1da177e4 | 372 | /* Internal operations on file data */ |
bd4c625c | 373 | static inline void reiserfs_put_page(struct page *page) |
1da177e4 | 374 | { |
bd4c625c LT |
375 | kunmap(page); |
376 | page_cache_release(page); | |
1da177e4 LT |
377 | } |
378 | ||
bd4c625c | 379 | static struct page *reiserfs_get_page(struct inode *dir, unsigned long n) |
1da177e4 | 380 | { |
bd4c625c LT |
381 | struct address_space *mapping = dir->i_mapping; |
382 | struct page *page; | |
383 | /* We can deadlock if we try to free dentries, | |
384 | and an unlink/rmdir has just occured - GFP_NOFS avoids this */ | |
c4cdd038 | 385 | mapping_set_gfp_mask(mapping, GFP_NOFS); |
090d2b18 | 386 | page = read_mapping_page(mapping, n, NULL); |
bd4c625c | 387 | if (!IS_ERR(page)) { |
bd4c625c | 388 | kmap(page); |
bd4c625c LT |
389 | if (PageError(page)) |
390 | goto fail; | |
391 | } | |
392 | return page; | |
393 | ||
394 | fail: | |
395 | reiserfs_put_page(page); | |
396 | return ERR_PTR(-EIO); | |
1da177e4 LT |
397 | } |
398 | ||
bd4c625c | 399 | static inline __u32 xattr_hash(const char *msg, int len) |
1da177e4 | 400 | { |
bd4c625c | 401 | return csum_partial(msg, len, 0); |
1da177e4 LT |
402 | } |
403 | ||
ba9d8cec VS |
404 | int reiserfs_commit_write(struct file *f, struct page *page, |
405 | unsigned from, unsigned to); | |
406 | int reiserfs_prepare_write(struct file *f, struct page *page, | |
407 | unsigned from, unsigned to); | |
408 | ||
409 | ||
1da177e4 LT |
410 | /* Generic extended attribute operations that can be used by xa plugins */ |
411 | ||
412 | /* | |
1b1dcc1b | 413 | * inode->i_mutex: down |
1da177e4 LT |
414 | */ |
415 | int | |
bd4c625c LT |
416 | reiserfs_xattr_set(struct inode *inode, const char *name, const void *buffer, |
417 | size_t buffer_size, int flags) | |
1da177e4 | 418 | { |
bd4c625c | 419 | int err = 0; |
3227e14c | 420 | struct dentry *dentry; |
bd4c625c LT |
421 | struct page *page; |
422 | char *data; | |
423 | struct address_space *mapping; | |
424 | size_t file_pos = 0; | |
425 | size_t buffer_pos = 0; | |
426 | struct inode *xinode; | |
427 | struct iattr newattrs; | |
428 | __u32 xahash = 0; | |
429 | ||
bd4c625c LT |
430 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
431 | return -EOPNOTSUPP; | |
432 | ||
433 | /* Empty xattrs are ok, they're just empty files, no hash */ | |
434 | if (buffer && buffer_size) | |
435 | xahash = xattr_hash(buffer, buffer_size); | |
436 | ||
437 | open_file: | |
3227e14c JM |
438 | dentry = get_xa_file_dentry(inode, name, flags); |
439 | if (IS_ERR(dentry)) { | |
440 | err = PTR_ERR(dentry); | |
bd4c625c LT |
441 | goto out; |
442 | } | |
443 | ||
3227e14c | 444 | xinode = dentry->d_inode; |
bd4c625c LT |
445 | REISERFS_I(inode)->i_flags |= i_has_xattr_dir; |
446 | ||
447 | /* we need to copy it off.. */ | |
448 | if (xinode->i_nlink > 1) { | |
3227e14c | 449 | dput(dentry); |
bd4c625c LT |
450 | err = reiserfs_xattr_del(inode, name); |
451 | if (err < 0) | |
452 | goto out; | |
453 | /* We just killed the old one, we're not replacing anymore */ | |
454 | if (flags & XATTR_REPLACE) | |
455 | flags &= ~XATTR_REPLACE; | |
456 | goto open_file; | |
457 | } | |
458 | ||
459 | /* Resize it so we're ok to write there */ | |
460 | newattrs.ia_size = buffer_size; | |
461 | newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME; | |
75983928 | 462 | mutex_lock_nested(&xinode->i_mutex, I_MUTEX_XATTR); |
3227e14c | 463 | err = notify_change(dentry, &newattrs); |
bd4c625c LT |
464 | if (err) |
465 | goto out_filp; | |
466 | ||
467 | mapping = xinode->i_mapping; | |
468 | while (buffer_pos < buffer_size || buffer_pos == 0) { | |
469 | size_t chunk; | |
470 | size_t skip = 0; | |
471 | size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1)); | |
472 | if (buffer_size - buffer_pos > PAGE_CACHE_SIZE) | |
473 | chunk = PAGE_CACHE_SIZE; | |
474 | else | |
475 | chunk = buffer_size - buffer_pos; | |
476 | ||
477 | page = reiserfs_get_page(xinode, file_pos >> PAGE_CACHE_SHIFT); | |
478 | if (IS_ERR(page)) { | |
479 | err = PTR_ERR(page); | |
480 | goto out_filp; | |
481 | } | |
482 | ||
483 | lock_page(page); | |
484 | data = page_address(page); | |
485 | ||
486 | if (file_pos == 0) { | |
487 | struct reiserfs_xattr_header *rxh; | |
488 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
489 | if (chunk + skip > PAGE_CACHE_SIZE) | |
490 | chunk = PAGE_CACHE_SIZE - skip; | |
491 | rxh = (struct reiserfs_xattr_header *)data; | |
492 | rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); | |
493 | rxh->h_hash = cpu_to_le32(xahash); | |
494 | } | |
495 | ||
3227e14c | 496 | err = reiserfs_prepare_write(NULL, page, page_offset, |
ba9d8cec | 497 | page_offset + chunk + skip); |
bd4c625c LT |
498 | if (!err) { |
499 | if (buffer) | |
500 | memcpy(data + skip, buffer + buffer_pos, chunk); | |
3227e14c JM |
501 | err = reiserfs_commit_write(NULL, page, page_offset, |
502 | page_offset + chunk + | |
503 | skip); | |
bd4c625c LT |
504 | } |
505 | unlock_page(page); | |
506 | reiserfs_put_page(page); | |
507 | buffer_pos += chunk; | |
508 | file_pos += chunk; | |
509 | skip = 0; | |
510 | if (err || buffer_size == 0 || !buffer) | |
511 | break; | |
512 | } | |
513 | ||
514 | /* We can't mark the inode dirty if it's not hashed. This is the case | |
515 | * when we're inheriting the default ACL. If we dirty it, the inode | |
516 | * gets marked dirty, but won't (ever) make it onto the dirty list until | |
517 | * it's synced explicitly to clear I_DIRTY. This is bad. */ | |
518 | if (!hlist_unhashed(&inode->i_hash)) { | |
519 | inode->i_ctime = CURRENT_TIME_SEC; | |
520 | mark_inode_dirty(inode); | |
1da177e4 | 521 | } |
bd4c625c LT |
522 | |
523 | out_filp: | |
1b1dcc1b | 524 | mutex_unlock(&xinode->i_mutex); |
3227e14c | 525 | dput(dentry); |
bd4c625c LT |
526 | |
527 | out: | |
528 | return err; | |
1da177e4 LT |
529 | } |
530 | ||
531 | /* | |
1b1dcc1b | 532 | * inode->i_mutex: down |
1da177e4 LT |
533 | */ |
534 | int | |
bd4c625c LT |
535 | reiserfs_xattr_get(const struct inode *inode, const char *name, void *buffer, |
536 | size_t buffer_size) | |
1da177e4 | 537 | { |
bd4c625c | 538 | ssize_t err = 0; |
3227e14c | 539 | struct dentry *dentry; |
bd4c625c LT |
540 | size_t isize; |
541 | size_t file_pos = 0; | |
542 | size_t buffer_pos = 0; | |
543 | struct page *page; | |
544 | struct inode *xinode; | |
545 | __u32 hash = 0; | |
546 | ||
547 | if (name == NULL) | |
548 | return -EINVAL; | |
549 | ||
550 | /* We can't have xattrs attached to v1 items since they don't have | |
551 | * generation numbers */ | |
552 | if (get_inode_sd_version(inode) == STAT_DATA_V1) | |
553 | return -EOPNOTSUPP; | |
554 | ||
3227e14c JM |
555 | dentry = get_xa_file_dentry(inode, name, FL_READONLY); |
556 | if (IS_ERR(dentry)) { | |
557 | err = PTR_ERR(dentry); | |
bd4c625c LT |
558 | goto out; |
559 | } | |
560 | ||
3227e14c | 561 | xinode = dentry->d_inode; |
bd4c625c LT |
562 | isize = xinode->i_size; |
563 | REISERFS_I(inode)->i_flags |= i_has_xattr_dir; | |
564 | ||
565 | /* Just return the size needed */ | |
566 | if (buffer == NULL) { | |
567 | err = isize - sizeof(struct reiserfs_xattr_header); | |
568 | goto out_dput; | |
569 | } | |
570 | ||
571 | if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { | |
572 | err = -ERANGE; | |
573 | goto out_dput; | |
574 | } | |
575 | ||
576 | while (file_pos < isize) { | |
577 | size_t chunk; | |
578 | char *data; | |
579 | size_t skip = 0; | |
580 | if (isize - file_pos > PAGE_CACHE_SIZE) | |
581 | chunk = PAGE_CACHE_SIZE; | |
582 | else | |
583 | chunk = isize - file_pos; | |
584 | ||
585 | page = reiserfs_get_page(xinode, file_pos >> PAGE_CACHE_SHIFT); | |
586 | if (IS_ERR(page)) { | |
587 | err = PTR_ERR(page); | |
588 | goto out_dput; | |
589 | } | |
590 | ||
591 | lock_page(page); | |
592 | data = page_address(page); | |
593 | if (file_pos == 0) { | |
594 | struct reiserfs_xattr_header *rxh = | |
595 | (struct reiserfs_xattr_header *)data; | |
596 | skip = file_pos = sizeof(struct reiserfs_xattr_header); | |
597 | chunk -= skip; | |
598 | /* Magic doesn't match up.. */ | |
599 | if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { | |
600 | unlock_page(page); | |
601 | reiserfs_put_page(page); | |
45b03d5e | 602 | reiserfs_warning(inode->i_sb, "jdm-20001", |
bd4c625c LT |
603 | "Invalid magic for xattr (%s) " |
604 | "associated with %k", name, | |
605 | INODE_PKEY(inode)); | |
606 | err = -EIO; | |
607 | goto out_dput; | |
608 | } | |
609 | hash = le32_to_cpu(rxh->h_hash); | |
610 | } | |
611 | memcpy(buffer + buffer_pos, data + skip, chunk); | |
612 | unlock_page(page); | |
613 | reiserfs_put_page(page); | |
614 | file_pos += chunk; | |
615 | buffer_pos += chunk; | |
616 | skip = 0; | |
617 | } | |
618 | err = isize - sizeof(struct reiserfs_xattr_header); | |
619 | ||
620 | if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != | |
621 | hash) { | |
45b03d5e | 622 | reiserfs_warning(inode->i_sb, "jdm-20002", |
bd4c625c LT |
623 | "Invalid hash for xattr (%s) associated " |
624 | "with %k", name, INODE_PKEY(inode)); | |
625 | err = -EIO; | |
626 | } | |
627 | ||
628 | out_dput: | |
3227e14c | 629 | dput(dentry); |
bd4c625c LT |
630 | |
631 | out: | |
632 | return err; | |
1da177e4 LT |
633 | } |
634 | ||
635 | static int | |
bd4c625c | 636 | __reiserfs_xattr_del(struct dentry *xadir, const char *name, int namelen) |
1da177e4 | 637 | { |
bd4c625c LT |
638 | struct dentry *dentry; |
639 | struct inode *dir = xadir->d_inode; | |
640 | int err = 0; | |
641 | ||
642 | dentry = lookup_one_len(name, xadir, namelen); | |
643 | if (IS_ERR(dentry)) { | |
644 | err = PTR_ERR(dentry); | |
645 | goto out; | |
646 | } else if (!dentry->d_inode) { | |
647 | err = -ENODATA; | |
648 | goto out_file; | |
649 | } | |
650 | ||
651 | /* Skip directories.. */ | |
652 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
653 | goto out_file; | |
654 | ||
655 | if (!is_reiserfs_priv_object(dentry->d_inode)) { | |
0030b645 JM |
656 | reiserfs_error(dir->i_sb, "jdm-20003", |
657 | "OID %08x [%.*s/%.*s] doesn't have " | |
658 | "priv flag set [parent is %sset].", | |
659 | le32_to_cpu(INODE_PKEY(dentry->d_inode)-> | |
660 | k_objectid), xadir->d_name.len, | |
661 | xadir->d_name.name, namelen, name, | |
662 | is_reiserfs_priv_object(xadir->d_inode) ? "" : | |
663 | "not "); | |
bd4c625c LT |
664 | dput(dentry); |
665 | return -EIO; | |
666 | } | |
1da177e4 | 667 | |
bd4c625c LT |
668 | err = dir->i_op->unlink(dir, dentry); |
669 | if (!err) | |
670 | d_delete(dentry); | |
1da177e4 | 671 | |
bd4c625c LT |
672 | out_file: |
673 | dput(dentry); | |
674 | ||
675 | out: | |
676 | return err; | |
677 | } | |
678 | ||
679 | int reiserfs_xattr_del(struct inode *inode, const char *name) | |
1da177e4 | 680 | { |
bd4c625c LT |
681 | struct dentry *dir; |
682 | int err; | |
1da177e4 | 683 | |
bd4c625c LT |
684 | dir = open_xa_dir(inode, FL_READONLY); |
685 | if (IS_ERR(dir)) { | |
686 | err = PTR_ERR(dir); | |
687 | goto out; | |
688 | } | |
1da177e4 | 689 | |
bd4c625c LT |
690 | err = __reiserfs_xattr_del(dir, name, strlen(name)); |
691 | dput(dir); | |
1da177e4 | 692 | |
bd4c625c LT |
693 | if (!err) { |
694 | inode->i_ctime = CURRENT_TIME_SEC; | |
695 | mark_inode_dirty(inode); | |
696 | } | |
1da177e4 | 697 | |
bd4c625c LT |
698 | out: |
699 | return err; | |
1da177e4 LT |
700 | } |
701 | ||
702 | /* The following are side effects of other operations that aren't explicitly | |
703 | * modifying extended attributes. This includes operations such as permissions | |
704 | * or ownership changes, object deletions, etc. */ | |
705 | ||
706 | static int | |
bd4c625c | 707 | reiserfs_delete_xattrs_filler(void *buf, const char *name, int namelen, |
afefdbb2 | 708 | loff_t offset, u64 ino, unsigned int d_type) |
1da177e4 | 709 | { |
bd4c625c | 710 | struct dentry *xadir = (struct dentry *)buf; |
1da177e4 | 711 | |
bd4c625c | 712 | return __reiserfs_xattr_del(xadir, name, namelen); |
1da177e4 LT |
713 | |
714 | } | |
715 | ||
1b1dcc1b | 716 | /* This is called w/ inode->i_mutex downed */ |
bd4c625c | 717 | int reiserfs_delete_xattrs(struct inode *inode) |
1da177e4 | 718 | { |
bd4c625c LT |
719 | struct dentry *dir, *root; |
720 | int err = 0; | |
721 | ||
722 | /* Skip out, an xattr has no xattrs associated with it */ | |
723 | if (is_reiserfs_priv_object(inode) || | |
724 | get_inode_sd_version(inode) == STAT_DATA_V1 || | |
725 | !reiserfs_xattrs(inode->i_sb)) { | |
726 | return 0; | |
727 | } | |
728 | reiserfs_read_lock_xattrs(inode->i_sb); | |
729 | dir = open_xa_dir(inode, FL_READONLY); | |
730 | reiserfs_read_unlock_xattrs(inode->i_sb); | |
731 | if (IS_ERR(dir)) { | |
732 | err = PTR_ERR(dir); | |
733 | goto out; | |
734 | } else if (!dir->d_inode) { | |
735 | dput(dir); | |
736 | return 0; | |
737 | } | |
738 | ||
bd4c625c | 739 | lock_kernel(); |
3227e14c | 740 | err = xattr_readdir(dir->d_inode, reiserfs_delete_xattrs_filler, dir); |
bd4c625c LT |
741 | if (err) { |
742 | unlock_kernel(); | |
743 | goto out_dir; | |
744 | } | |
745 | ||
746 | /* Leftovers besides . and .. -- that's not good. */ | |
747 | if (dir->d_inode->i_nlink <= 2) { | |
9b7f3755 | 748 | root = get_xa_root(inode->i_sb, XATTR_REPLACE); |
bd4c625c LT |
749 | reiserfs_write_lock_xattrs(inode->i_sb); |
750 | err = vfs_rmdir(root->d_inode, dir); | |
751 | reiserfs_write_unlock_xattrs(inode->i_sb); | |
752 | dput(root); | |
753 | } else { | |
45b03d5e | 754 | reiserfs_warning(inode->i_sb, "jdm-20006", |
bd4c625c LT |
755 | "Couldn't remove all entries in directory"); |
756 | } | |
757 | unlock_kernel(); | |
758 | ||
759 | out_dir: | |
3227e14c | 760 | dput(dir); |
bd4c625c LT |
761 | |
762 | out: | |
763 | if (!err) | |
764 | REISERFS_I(inode)->i_flags = | |
765 | REISERFS_I(inode)->i_flags & ~i_has_xattr_dir; | |
766 | return err; | |
1da177e4 LT |
767 | } |
768 | ||
769 | struct reiserfs_chown_buf { | |
bd4c625c LT |
770 | struct inode *inode; |
771 | struct dentry *xadir; | |
772 | struct iattr *attrs; | |
1da177e4 LT |
773 | }; |
774 | ||
775 | /* XXX: If there is a better way to do this, I'd love to hear about it */ | |
776 | static int | |
bd4c625c | 777 | reiserfs_chown_xattrs_filler(void *buf, const char *name, int namelen, |
afefdbb2 | 778 | loff_t offset, u64 ino, unsigned int d_type) |
1da177e4 | 779 | { |
bd4c625c LT |
780 | struct reiserfs_chown_buf *chown_buf = (struct reiserfs_chown_buf *)buf; |
781 | struct dentry *xafile, *xadir = chown_buf->xadir; | |
782 | struct iattr *attrs = chown_buf->attrs; | |
783 | int err = 0; | |
784 | ||
785 | xafile = lookup_one_len(name, xadir, namelen); | |
786 | if (IS_ERR(xafile)) | |
787 | return PTR_ERR(xafile); | |
788 | else if (!xafile->d_inode) { | |
789 | dput(xafile); | |
790 | return -ENODATA; | |
791 | } | |
792 | ||
793 | if (!S_ISDIR(xafile->d_inode->i_mode)) | |
794 | err = notify_change(xafile, attrs); | |
795 | dput(xafile); | |
796 | ||
797 | return err; | |
1da177e4 LT |
798 | } |
799 | ||
bd4c625c | 800 | int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) |
1da177e4 | 801 | { |
bd4c625c LT |
802 | struct dentry *dir; |
803 | int err = 0; | |
804 | struct reiserfs_chown_buf buf; | |
805 | unsigned int ia_valid = attrs->ia_valid; | |
806 | ||
807 | /* Skip out, an xattr has no xattrs associated with it */ | |
808 | if (is_reiserfs_priv_object(inode) || | |
809 | get_inode_sd_version(inode) == STAT_DATA_V1 || | |
810 | !reiserfs_xattrs(inode->i_sb)) { | |
811 | return 0; | |
812 | } | |
813 | reiserfs_read_lock_xattrs(inode->i_sb); | |
814 | dir = open_xa_dir(inode, FL_READONLY); | |
815 | reiserfs_read_unlock_xattrs(inode->i_sb); | |
816 | if (IS_ERR(dir)) { | |
817 | if (PTR_ERR(dir) != -ENODATA) | |
818 | err = PTR_ERR(dir); | |
819 | goto out; | |
820 | } else if (!dir->d_inode) { | |
821 | dput(dir); | |
822 | goto out; | |
823 | } | |
824 | ||
bd4c625c LT |
825 | lock_kernel(); |
826 | ||
827 | attrs->ia_valid &= (ATTR_UID | ATTR_GID | ATTR_CTIME); | |
828 | buf.xadir = dir; | |
829 | buf.attrs = attrs; | |
830 | buf.inode = inode; | |
831 | ||
3227e14c | 832 | err = xattr_readdir(dir->d_inode, reiserfs_chown_xattrs_filler, &buf); |
bd4c625c LT |
833 | if (err) { |
834 | unlock_kernel(); | |
835 | goto out_dir; | |
836 | } | |
837 | ||
838 | err = notify_change(dir, attrs); | |
839 | unlock_kernel(); | |
840 | ||
841 | out_dir: | |
3227e14c | 842 | dput(dir); |
bd4c625c LT |
843 | |
844 | out: | |
845 | attrs->ia_valid = ia_valid; | |
846 | return err; | |
847 | } | |
1da177e4 LT |
848 | |
849 | /* Actual operations that are exported to VFS-land */ | |
850 | ||
851 | /* | |
852 | * Inode operation getxattr() | |
1b1dcc1b | 853 | * Preliminary locking: we down dentry->d_inode->i_mutex |
1da177e4 LT |
854 | */ |
855 | ssize_t | |
bd4c625c LT |
856 | reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, |
857 | size_t size) | |
1da177e4 | 858 | { |
bd4c625c LT |
859 | struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(name); |
860 | int err; | |
861 | ||
862 | if (!xah || !reiserfs_xattrs(dentry->d_sb) || | |
863 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) | |
864 | return -EOPNOTSUPP; | |
865 | ||
866 | reiserfs_read_lock_xattr_i(dentry->d_inode); | |
867 | reiserfs_read_lock_xattrs(dentry->d_sb); | |
868 | err = xah->get(dentry->d_inode, name, buffer, size); | |
869 | reiserfs_read_unlock_xattrs(dentry->d_sb); | |
870 | reiserfs_read_unlock_xattr_i(dentry->d_inode); | |
871 | return err; | |
1da177e4 LT |
872 | } |
873 | ||
1da177e4 LT |
874 | /* |
875 | * Inode operation setxattr() | |
876 | * | |
1b1dcc1b | 877 | * dentry->d_inode->i_mutex down |
1da177e4 LT |
878 | */ |
879 | int | |
bd4c625c LT |
880 | reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
881 | size_t size, int flags) | |
1da177e4 | 882 | { |
bd4c625c LT |
883 | struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(name); |
884 | int err; | |
885 | int lock; | |
886 | ||
887 | if (!xah || !reiserfs_xattrs(dentry->d_sb) || | |
888 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) | |
889 | return -EOPNOTSUPP; | |
890 | ||
bd4c625c LT |
891 | reiserfs_write_lock_xattr_i(dentry->d_inode); |
892 | lock = !has_xattr_dir(dentry->d_inode); | |
893 | if (lock) | |
894 | reiserfs_write_lock_xattrs(dentry->d_sb); | |
895 | else | |
896 | reiserfs_read_lock_xattrs(dentry->d_sb); | |
897 | err = xah->set(dentry->d_inode, name, value, size, flags); | |
898 | if (lock) | |
899 | reiserfs_write_unlock_xattrs(dentry->d_sb); | |
900 | else | |
901 | reiserfs_read_unlock_xattrs(dentry->d_sb); | |
902 | reiserfs_write_unlock_xattr_i(dentry->d_inode); | |
903 | return err; | |
1da177e4 LT |
904 | } |
905 | ||
906 | /* | |
907 | * Inode operation removexattr() | |
908 | * | |
1b1dcc1b | 909 | * dentry->d_inode->i_mutex down |
1da177e4 | 910 | */ |
bd4c625c | 911 | int reiserfs_removexattr(struct dentry *dentry, const char *name) |
1da177e4 | 912 | { |
bd4c625c LT |
913 | int err; |
914 | struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(name); | |
1da177e4 | 915 | |
bd4c625c LT |
916 | if (!xah || !reiserfs_xattrs(dentry->d_sb) || |
917 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) | |
918 | return -EOPNOTSUPP; | |
1da177e4 | 919 | |
bd4c625c LT |
920 | reiserfs_write_lock_xattr_i(dentry->d_inode); |
921 | reiserfs_read_lock_xattrs(dentry->d_sb); | |
1da177e4 | 922 | |
bd4c625c LT |
923 | /* Deletion pre-operation */ |
924 | if (xah->del) { | |
925 | err = xah->del(dentry->d_inode, name); | |
926 | if (err) | |
927 | goto out; | |
928 | } | |
1da177e4 | 929 | |
bd4c625c | 930 | err = reiserfs_xattr_del(dentry->d_inode, name); |
1da177e4 | 931 | |
bd4c625c LT |
932 | dentry->d_inode->i_ctime = CURRENT_TIME_SEC; |
933 | mark_inode_dirty(dentry->d_inode); | |
1da177e4 | 934 | |
bd4c625c LT |
935 | out: |
936 | reiserfs_read_unlock_xattrs(dentry->d_sb); | |
937 | reiserfs_write_unlock_xattr_i(dentry->d_inode); | |
938 | return err; | |
1da177e4 LT |
939 | } |
940 | ||
1da177e4 LT |
941 | /* This is what filldir will use: |
942 | * r_pos will always contain the amount of space required for the entire | |
943 | * list. If r_pos becomes larger than r_size, we need more space and we | |
944 | * return an error indicating this. If r_pos is less than r_size, then we've | |
945 | * filled the buffer successfully and we return success */ | |
946 | struct reiserfs_listxattr_buf { | |
bd4c625c LT |
947 | int r_pos; |
948 | int r_size; | |
949 | char *r_buf; | |
950 | struct inode *r_inode; | |
1da177e4 LT |
951 | }; |
952 | ||
953 | static int | |
bd4c625c | 954 | reiserfs_listxattr_filler(void *buf, const char *name, int namelen, |
afefdbb2 | 955 | loff_t offset, u64 ino, unsigned int d_type) |
1da177e4 | 956 | { |
bd4c625c LT |
957 | struct reiserfs_listxattr_buf *b = (struct reiserfs_listxattr_buf *)buf; |
958 | int len = 0; | |
959 | if (name[0] != '.' | |
960 | || (namelen != 1 && (name[1] != '.' || namelen != 2))) { | |
961 | struct reiserfs_xattr_handler *xah = | |
962 | find_xattr_handler_prefix(name); | |
963 | if (!xah) | |
964 | return 0; /* Unsupported xattr name, skip it */ | |
965 | ||
966 | /* We call ->list() twice because the operation isn't required to just | |
967 | * return the name back - we want to make sure we have enough space */ | |
968 | len += xah->list(b->r_inode, name, namelen, NULL); | |
969 | ||
970 | if (len) { | |
971 | if (b->r_pos + len + 1 <= b->r_size) { | |
972 | char *p = b->r_buf + b->r_pos; | |
973 | p += xah->list(b->r_inode, name, namelen, p); | |
974 | *p++ = '\0'; | |
975 | } | |
976 | b->r_pos += len + 1; | |
977 | } | |
978 | } | |
979 | ||
980 | return 0; | |
1da177e4 | 981 | } |
bd4c625c | 982 | |
1da177e4 LT |
983 | /* |
984 | * Inode operation listxattr() | |
985 | * | |
1b1dcc1b | 986 | * Preliminary locking: we down dentry->d_inode->i_mutex |
1da177e4 | 987 | */ |
bd4c625c | 988 | ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
1da177e4 | 989 | { |
bd4c625c LT |
990 | struct dentry *dir; |
991 | int err = 0; | |
992 | struct reiserfs_listxattr_buf buf; | |
993 | ||
994 | if (!dentry->d_inode) | |
995 | return -EINVAL; | |
996 | ||
997 | if (!reiserfs_xattrs(dentry->d_sb) || | |
998 | get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) | |
999 | return -EOPNOTSUPP; | |
1000 | ||
1001 | reiserfs_read_lock_xattr_i(dentry->d_inode); | |
1002 | reiserfs_read_lock_xattrs(dentry->d_sb); | |
1003 | dir = open_xa_dir(dentry->d_inode, FL_READONLY); | |
1004 | reiserfs_read_unlock_xattrs(dentry->d_sb); | |
1005 | if (IS_ERR(dir)) { | |
1006 | err = PTR_ERR(dir); | |
1007 | if (err == -ENODATA) | |
1008 | err = 0; /* Not an error if there aren't any xattrs */ | |
1009 | goto out; | |
1010 | } | |
1011 | ||
bd4c625c LT |
1012 | buf.r_buf = buffer; |
1013 | buf.r_size = buffer ? size : 0; | |
1014 | buf.r_pos = 0; | |
1015 | buf.r_inode = dentry->d_inode; | |
1016 | ||
1017 | REISERFS_I(dentry->d_inode)->i_flags |= i_has_xattr_dir; | |
1018 | ||
3227e14c | 1019 | err = xattr_readdir(dir->d_inode, reiserfs_listxattr_filler, &buf); |
bd4c625c LT |
1020 | if (err) |
1021 | goto out_dir; | |
1022 | ||
1023 | if (buf.r_pos > buf.r_size && buffer != NULL) | |
1024 | err = -ERANGE; | |
1025 | else | |
1026 | err = buf.r_pos; | |
1027 | ||
1028 | out_dir: | |
3227e14c | 1029 | dput(dir); |
bd4c625c LT |
1030 | |
1031 | out: | |
1032 | reiserfs_read_unlock_xattr_i(dentry->d_inode); | |
1033 | return err; | |
1da177e4 LT |
1034 | } |
1035 | ||
1036 | /* This is the implementation for the xattr plugin infrastructure */ | |
bcf11cbe | 1037 | static LIST_HEAD(xattr_handlers); |
1da177e4 LT |
1038 | static DEFINE_RWLOCK(handler_lock); |
1039 | ||
bd4c625c LT |
1040 | static struct reiserfs_xattr_handler *find_xattr_handler_prefix(const char |
1041 | *prefix) | |
1da177e4 | 1042 | { |
bd4c625c LT |
1043 | struct reiserfs_xattr_handler *xah = NULL; |
1044 | struct list_head *p; | |
1045 | ||
1046 | read_lock(&handler_lock); | |
1047 | list_for_each(p, &xattr_handlers) { | |
1048 | xah = list_entry(p, struct reiserfs_xattr_handler, handlers); | |
1049 | if (strncmp(xah->prefix, prefix, strlen(xah->prefix)) == 0) | |
1050 | break; | |
1051 | xah = NULL; | |
1052 | } | |
1053 | ||
1054 | read_unlock(&handler_lock); | |
1055 | return xah; | |
1da177e4 LT |
1056 | } |
1057 | ||
bd4c625c | 1058 | static void __unregister_handlers(void) |
1da177e4 | 1059 | { |
bd4c625c LT |
1060 | struct reiserfs_xattr_handler *xah; |
1061 | struct list_head *p, *tmp; | |
1da177e4 | 1062 | |
bd4c625c LT |
1063 | list_for_each_safe(p, tmp, &xattr_handlers) { |
1064 | xah = list_entry(p, struct reiserfs_xattr_handler, handlers); | |
1065 | if (xah->exit) | |
1066 | xah->exit(); | |
1da177e4 | 1067 | |
bd4c625c LT |
1068 | list_del_init(p); |
1069 | } | |
1070 | INIT_LIST_HEAD(&xattr_handlers); | |
1da177e4 LT |
1071 | } |
1072 | ||
bd4c625c | 1073 | int __init reiserfs_xattr_register_handlers(void) |
1da177e4 | 1074 | { |
bd4c625c LT |
1075 | int err = 0; |
1076 | struct reiserfs_xattr_handler *xah; | |
1077 | struct list_head *p; | |
1da177e4 | 1078 | |
bd4c625c | 1079 | write_lock(&handler_lock); |
1da177e4 | 1080 | |
bd4c625c LT |
1081 | /* If we're already initialized, nothing to do */ |
1082 | if (!list_empty(&xattr_handlers)) { | |
1083 | write_unlock(&handler_lock); | |
1084 | return 0; | |
1085 | } | |
1da177e4 | 1086 | |
bd4c625c LT |
1087 | /* Add the handlers */ |
1088 | list_add_tail(&user_handler.handlers, &xattr_handlers); | |
1089 | list_add_tail(&trusted_handler.handlers, &xattr_handlers); | |
1da177e4 | 1090 | #ifdef CONFIG_REISERFS_FS_SECURITY |
bd4c625c | 1091 | list_add_tail(&security_handler.handlers, &xattr_handlers); |
1da177e4 LT |
1092 | #endif |
1093 | #ifdef CONFIG_REISERFS_FS_POSIX_ACL | |
bd4c625c LT |
1094 | list_add_tail(&posix_acl_access_handler.handlers, &xattr_handlers); |
1095 | list_add_tail(&posix_acl_default_handler.handlers, &xattr_handlers); | |
1da177e4 LT |
1096 | #endif |
1097 | ||
bd4c625c LT |
1098 | /* Run initializers, if available */ |
1099 | list_for_each(p, &xattr_handlers) { | |
1100 | xah = list_entry(p, struct reiserfs_xattr_handler, handlers); | |
1101 | if (xah->init) { | |
1102 | err = xah->init(); | |
1103 | if (err) { | |
1104 | list_del_init(p); | |
1105 | break; | |
1106 | } | |
1107 | } | |
1108 | } | |
1109 | ||
1110 | /* Clean up other handlers, if any failed */ | |
1111 | if (err) | |
1112 | __unregister_handlers(); | |
1113 | ||
1114 | write_unlock(&handler_lock); | |
1115 | return err; | |
1da177e4 LT |
1116 | } |
1117 | ||
bd4c625c | 1118 | void reiserfs_xattr_unregister_handlers(void) |
1da177e4 | 1119 | { |
bd4c625c LT |
1120 | write_lock(&handler_lock); |
1121 | __unregister_handlers(); | |
1122 | write_unlock(&handler_lock); | |
1da177e4 LT |
1123 | } |
1124 | ||
1125 | /* This will catch lookups from the fs root to .reiserfs_priv */ | |
1126 | static int | |
bd4c625c | 1127 | xattr_lookup_poison(struct dentry *dentry, struct qstr *q1, struct qstr *name) |
1da177e4 | 1128 | { |
bd4c625c LT |
1129 | struct dentry *priv_root = REISERFS_SB(dentry->d_sb)->priv_root; |
1130 | if (name->len == priv_root->d_name.len && | |
1131 | name->hash == priv_root->d_name.hash && | |
1132 | !memcmp(name->name, priv_root->d_name.name, name->len)) { | |
1133 | return -ENOENT; | |
1134 | } else if (q1->len == name->len && | |
1135 | !memcmp(q1->name, name->name, name->len)) | |
1136 | return 0; | |
1137 | return 1; | |
1da177e4 LT |
1138 | } |
1139 | ||
1140 | static struct dentry_operations xattr_lookup_poison_ops = { | |
bd4c625c | 1141 | .d_compare = xattr_lookup_poison, |
1da177e4 LT |
1142 | }; |
1143 | ||
1da177e4 LT |
1144 | /* We need to take a copy of the mount flags since things like |
1145 | * MS_RDONLY don't get set until *after* we're called. | |
1146 | * mount_flags != mount_options */ | |
bd4c625c | 1147 | int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
1da177e4 | 1148 | { |
bd4c625c LT |
1149 | int err = 0; |
1150 | ||
1151 | /* We need generation numbers to ensure that the oid mapping is correct | |
1152 | * v3.5 filesystems don't have them. */ | |
1153 | if (!old_format_only(s)) { | |
1154 | set_bit(REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt)); | |
1155 | } else if (reiserfs_xattrs_optional(s)) { | |
1156 | /* Old format filesystem, but optional xattrs have been enabled | |
1157 | * at mount time. Error out. */ | |
45b03d5e JM |
1158 | reiserfs_warning(s, "jdm-20005", |
1159 | "xattrs/ACLs not supported on pre v3.6 " | |
bd4c625c LT |
1160 | "format filesystem. Failing mount."); |
1161 | err = -EOPNOTSUPP; | |
1162 | goto error; | |
1163 | } else { | |
1164 | /* Old format filesystem, but no optional xattrs have been enabled. This | |
1165 | * means we silently disable xattrs on the filesystem. */ | |
1166 | clear_bit(REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt)); | |
1167 | } | |
1168 | ||
1169 | /* If we don't have the privroot located yet - go find it */ | |
1170 | if (reiserfs_xattrs(s) && !REISERFS_SB(s)->priv_root) { | |
1171 | struct dentry *dentry; | |
1172 | dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, | |
1173 | strlen(PRIVROOT_NAME)); | |
1174 | if (!IS_ERR(dentry)) { | |
1175 | if (!(mount_flags & MS_RDONLY) && !dentry->d_inode) { | |
1176 | struct inode *inode = dentry->d_parent->d_inode; | |
75983928 JM |
1177 | mutex_lock_nested(&inode->i_mutex, |
1178 | I_MUTEX_XATTR); | |
bd4c625c | 1179 | err = inode->i_op->mkdir(inode, dentry, 0700); |
1b1dcc1b | 1180 | mutex_unlock(&inode->i_mutex); |
bd4c625c LT |
1181 | if (err) { |
1182 | dput(dentry); | |
1183 | dentry = NULL; | |
1184 | } | |
1185 | ||
1186 | if (dentry && dentry->d_inode) | |
1d889d99 JM |
1187 | reiserfs_info(s, "Created %s - " |
1188 | "reserved for xattr " | |
1189 | "storage.\n", | |
1190 | PRIVROOT_NAME); | |
bd4c625c LT |
1191 | } else if (!dentry->d_inode) { |
1192 | dput(dentry); | |
1193 | dentry = NULL; | |
1194 | } | |
1195 | } else | |
1196 | err = PTR_ERR(dentry); | |
1197 | ||
1198 | if (!err && dentry) { | |
1199 | s->s_root->d_op = &xattr_lookup_poison_ops; | |
1200 | reiserfs_mark_inode_private(dentry->d_inode); | |
1201 | REISERFS_SB(s)->priv_root = dentry; | |
1202 | } else if (!(mount_flags & MS_RDONLY)) { /* xattrs are unavailable */ | |
1203 | /* If we're read-only it just means that the dir hasn't been | |
1204 | * created. Not an error -- just no xattrs on the fs. We'll | |
1205 | * check again if we go read-write */ | |
45b03d5e JM |
1206 | reiserfs_warning(s, "jdm-20006", |
1207 | "xattrs/ACLs enabled and couldn't " | |
1208 | "find/create .reiserfs_priv. " | |
1209 | "Failing mount."); | |
bd4c625c LT |
1210 | err = -EOPNOTSUPP; |
1211 | } | |
1212 | } | |
1213 | ||
1214 | error: | |
1215 | /* This is only nonzero if there was an error initializing the xattr | |
1216 | * directory or if there is a condition where we don't support them. */ | |
1217 | if (err) { | |
1218 | clear_bit(REISERFS_XATTRS, &(REISERFS_SB(s)->s_mount_opt)); | |
1219 | clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt)); | |
1220 | clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt)); | |
1221 | } | |
1222 | ||
1223 | /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */ | |
1224 | s->s_flags = s->s_flags & ~MS_POSIXACL; | |
1225 | if (reiserfs_posixacl(s)) | |
1226 | s->s_flags |= MS_POSIXACL; | |
1227 | ||
1228 | return err; | |
1da177e4 LT |
1229 | } |
1230 | ||
ec191574 | 1231 | static int reiserfs_check_acl(struct inode *inode, int mask) |
1da177e4 | 1232 | { |
ec191574 CH |
1233 | struct posix_acl *acl; |
1234 | int error = -EAGAIN; /* do regular unix permission checks by default */ | |
1da177e4 | 1235 | |
ec191574 CH |
1236 | reiserfs_read_lock_xattr_i(inode); |
1237 | reiserfs_read_lock_xattrs(inode->i_sb); | |
c87d0c07 | 1238 | |
ec191574 | 1239 | acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS); |
c87d0c07 | 1240 | |
ec191574 CH |
1241 | reiserfs_read_unlock_xattrs(inode->i_sb); |
1242 | reiserfs_read_unlock_xattr_i(inode); | |
bd4c625c | 1243 | |
ec191574 CH |
1244 | if (acl) { |
1245 | if (!IS_ERR(acl)) { | |
1246 | error = posix_acl_permission(inode, acl, mask); | |
bd4c625c | 1247 | posix_acl_release(acl); |
ec191574 CH |
1248 | } else if (PTR_ERR(acl) != -ENODATA) |
1249 | error = PTR_ERR(acl); | |
1da177e4 LT |
1250 | } |
1251 | ||
ec191574 CH |
1252 | return error; |
1253 | } | |
1da177e4 | 1254 | |
e6305c43 | 1255 | int reiserfs_permission(struct inode *inode, int mask) |
ec191574 | 1256 | { |
1da177e4 | 1257 | /* |
ec191574 CH |
1258 | * We don't do permission checks on the internal objects. |
1259 | * Permissions are determined by the "owning" object. | |
1da177e4 | 1260 | */ |
ec191574 CH |
1261 | if (is_reiserfs_priv_object(inode)) |
1262 | return 0; | |
1da177e4 LT |
1263 | |
1264 | /* | |
ec191574 | 1265 | * Stat data v1 doesn't support ACLs. |
1da177e4 | 1266 | */ |
ec191574 CH |
1267 | if (get_inode_sd_version(inode) == STAT_DATA_V1) |
1268 | return generic_permission(inode, mask, NULL); | |
1269 | else | |
1270 | return generic_permission(inode, mask, reiserfs_check_acl); | |
1da177e4 | 1271 | } |