]>
Commit | Line | Data |
---|---|---|
355da1eb SW |
1 | #include "ceph_debug.h" |
2 | #include "super.h" | |
3 | #include "decode.h" | |
4 | ||
5 | #include <linux/xattr.h> | |
5a0e3ad6 | 6 | #include <linux/slab.h> |
355da1eb SW |
7 | |
8 | static bool ceph_is_valid_xattr(const char *name) | |
9 | { | |
10 | return !strncmp(name, XATTR_SECURITY_PREFIX, | |
11 | XATTR_SECURITY_PREFIX_LEN) || | |
12 | !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) || | |
13 | !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN); | |
14 | } | |
15 | ||
16 | /* | |
17 | * These define virtual xattrs exposing the recursive directory | |
18 | * statistics and layout metadata. | |
19 | */ | |
20 | struct ceph_vxattr_cb { | |
21 | bool readonly; | |
22 | char *name; | |
23 | size_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val, | |
24 | size_t size); | |
25 | }; | |
26 | ||
27 | /* directories */ | |
28 | ||
29 | static size_t ceph_vxattrcb_entries(struct ceph_inode_info *ci, char *val, | |
30 | size_t size) | |
31 | { | |
32 | return snprintf(val, size, "%lld", ci->i_files + ci->i_subdirs); | |
33 | } | |
34 | ||
35 | static size_t ceph_vxattrcb_files(struct ceph_inode_info *ci, char *val, | |
36 | size_t size) | |
37 | { | |
38 | return snprintf(val, size, "%lld", ci->i_files); | |
39 | } | |
40 | ||
41 | static size_t ceph_vxattrcb_subdirs(struct ceph_inode_info *ci, char *val, | |
42 | size_t size) | |
43 | { | |
44 | return snprintf(val, size, "%lld", ci->i_subdirs); | |
45 | } | |
46 | ||
47 | static size_t ceph_vxattrcb_rentries(struct ceph_inode_info *ci, char *val, | |
48 | size_t size) | |
49 | { | |
50 | return snprintf(val, size, "%lld", ci->i_rfiles + ci->i_rsubdirs); | |
51 | } | |
52 | ||
53 | static size_t ceph_vxattrcb_rfiles(struct ceph_inode_info *ci, char *val, | |
54 | size_t size) | |
55 | { | |
56 | return snprintf(val, size, "%lld", ci->i_rfiles); | |
57 | } | |
58 | ||
59 | static size_t ceph_vxattrcb_rsubdirs(struct ceph_inode_info *ci, char *val, | |
60 | size_t size) | |
61 | { | |
62 | return snprintf(val, size, "%lld", ci->i_rsubdirs); | |
63 | } | |
64 | ||
65 | static size_t ceph_vxattrcb_rbytes(struct ceph_inode_info *ci, char *val, | |
66 | size_t size) | |
67 | { | |
68 | return snprintf(val, size, "%lld", ci->i_rbytes); | |
69 | } | |
70 | ||
71 | static size_t ceph_vxattrcb_rctime(struct ceph_inode_info *ci, char *val, | |
72 | size_t size) | |
73 | { | |
74 | return snprintf(val, size, "%ld.%ld", (long)ci->i_rctime.tv_sec, | |
75 | (long)ci->i_rctime.tv_nsec); | |
76 | } | |
77 | ||
78 | static struct ceph_vxattr_cb ceph_dir_vxattrs[] = { | |
79 | { true, "user.ceph.dir.entries", ceph_vxattrcb_entries}, | |
80 | { true, "user.ceph.dir.files", ceph_vxattrcb_files}, | |
81 | { true, "user.ceph.dir.subdirs", ceph_vxattrcb_subdirs}, | |
82 | { true, "user.ceph.dir.rentries", ceph_vxattrcb_rentries}, | |
83 | { true, "user.ceph.dir.rfiles", ceph_vxattrcb_rfiles}, | |
84 | { true, "user.ceph.dir.rsubdirs", ceph_vxattrcb_rsubdirs}, | |
85 | { true, "user.ceph.dir.rbytes", ceph_vxattrcb_rbytes}, | |
86 | { true, "user.ceph.dir.rctime", ceph_vxattrcb_rctime}, | |
87 | { true, NULL, NULL } | |
88 | }; | |
89 | ||
90 | /* files */ | |
91 | ||
92 | static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val, | |
93 | size_t size) | |
94 | { | |
b195befd SW |
95 | int ret; |
96 | ||
97 | ret = snprintf(val, size, | |
355da1eb SW |
98 | "chunk_bytes=%lld\nstripe_count=%lld\nobject_size=%lld\n", |
99 | (unsigned long long)ceph_file_layout_su(ci->i_layout), | |
100 | (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout), | |
101 | (unsigned long long)ceph_file_layout_object_size(ci->i_layout)); | |
b195befd SW |
102 | if (ceph_file_layout_pg_preferred(ci->i_layout)) |
103 | ret += snprintf(val + ret, size, "preferred_osd=%lld\n", | |
104 | (unsigned long long)ceph_file_layout_pg_preferred( | |
105 | ci->i_layout)); | |
106 | return ret; | |
355da1eb SW |
107 | } |
108 | ||
109 | static struct ceph_vxattr_cb ceph_file_vxattrs[] = { | |
110 | { true, "user.ceph.layout", ceph_vxattrcb_layout}, | |
111 | { NULL, NULL } | |
112 | }; | |
113 | ||
114 | static struct ceph_vxattr_cb *ceph_inode_vxattrs(struct inode *inode) | |
115 | { | |
116 | if (S_ISDIR(inode->i_mode)) | |
117 | return ceph_dir_vxattrs; | |
118 | else if (S_ISREG(inode->i_mode)) | |
119 | return ceph_file_vxattrs; | |
120 | return NULL; | |
121 | } | |
122 | ||
123 | static struct ceph_vxattr_cb *ceph_match_vxattr(struct ceph_vxattr_cb *vxattr, | |
124 | const char *name) | |
125 | { | |
126 | do { | |
127 | if (strcmp(vxattr->name, name) == 0) | |
128 | return vxattr; | |
129 | vxattr++; | |
130 | } while (vxattr->name); | |
131 | return NULL; | |
132 | } | |
133 | ||
134 | static int __set_xattr(struct ceph_inode_info *ci, | |
135 | const char *name, int name_len, | |
136 | const char *val, int val_len, | |
137 | int dirty, | |
138 | int should_free_name, int should_free_val, | |
139 | struct ceph_inode_xattr **newxattr) | |
140 | { | |
141 | struct rb_node **p; | |
142 | struct rb_node *parent = NULL; | |
143 | struct ceph_inode_xattr *xattr = NULL; | |
144 | int c; | |
145 | int new = 0; | |
146 | ||
147 | p = &ci->i_xattrs.index.rb_node; | |
148 | while (*p) { | |
149 | parent = *p; | |
150 | xattr = rb_entry(parent, struct ceph_inode_xattr, node); | |
151 | c = strncmp(name, xattr->name, min(name_len, xattr->name_len)); | |
152 | if (c < 0) | |
153 | p = &(*p)->rb_left; | |
154 | else if (c > 0) | |
155 | p = &(*p)->rb_right; | |
156 | else { | |
157 | if (name_len == xattr->name_len) | |
158 | break; | |
159 | else if (name_len < xattr->name_len) | |
160 | p = &(*p)->rb_left; | |
161 | else | |
162 | p = &(*p)->rb_right; | |
163 | } | |
164 | xattr = NULL; | |
165 | } | |
166 | ||
167 | if (!xattr) { | |
168 | new = 1; | |
169 | xattr = *newxattr; | |
170 | xattr->name = name; | |
171 | xattr->name_len = name_len; | |
172 | xattr->should_free_name = should_free_name; | |
173 | ||
174 | ci->i_xattrs.count++; | |
175 | dout("__set_xattr count=%d\n", ci->i_xattrs.count); | |
176 | } else { | |
177 | kfree(*newxattr); | |
178 | *newxattr = NULL; | |
179 | if (xattr->should_free_val) | |
180 | kfree((void *)xattr->val); | |
181 | ||
182 | if (should_free_name) { | |
183 | kfree((void *)name); | |
184 | name = xattr->name; | |
185 | } | |
186 | ci->i_xattrs.names_size -= xattr->name_len; | |
187 | ci->i_xattrs.vals_size -= xattr->val_len; | |
188 | } | |
355da1eb SW |
189 | ci->i_xattrs.names_size += name_len; |
190 | ci->i_xattrs.vals_size += val_len; | |
191 | if (val) | |
192 | xattr->val = val; | |
193 | else | |
194 | xattr->val = ""; | |
195 | ||
196 | xattr->val_len = val_len; | |
197 | xattr->dirty = dirty; | |
198 | xattr->should_free_val = (val && should_free_val); | |
199 | ||
200 | if (new) { | |
201 | rb_link_node(&xattr->node, parent, p); | |
202 | rb_insert_color(&xattr->node, &ci->i_xattrs.index); | |
203 | dout("__set_xattr_val p=%p\n", p); | |
204 | } | |
205 | ||
206 | dout("__set_xattr_val added %llx.%llx xattr %p %s=%.*s\n", | |
207 | ceph_vinop(&ci->vfs_inode), xattr, name, val_len, val); | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci, | |
213 | const char *name) | |
214 | { | |
215 | struct rb_node **p; | |
216 | struct rb_node *parent = NULL; | |
217 | struct ceph_inode_xattr *xattr = NULL; | |
218 | int c; | |
219 | ||
220 | p = &ci->i_xattrs.index.rb_node; | |
221 | while (*p) { | |
222 | parent = *p; | |
223 | xattr = rb_entry(parent, struct ceph_inode_xattr, node); | |
224 | c = strncmp(name, xattr->name, xattr->name_len); | |
225 | if (c < 0) | |
226 | p = &(*p)->rb_left; | |
227 | else if (c > 0) | |
228 | p = &(*p)->rb_right; | |
229 | else { | |
230 | dout("__get_xattr %s: found %.*s\n", name, | |
231 | xattr->val_len, xattr->val); | |
232 | return xattr; | |
233 | } | |
234 | } | |
235 | ||
236 | dout("__get_xattr %s: not found\n", name); | |
237 | ||
238 | return NULL; | |
239 | } | |
240 | ||
241 | static void __free_xattr(struct ceph_inode_xattr *xattr) | |
242 | { | |
243 | BUG_ON(!xattr); | |
244 | ||
245 | if (xattr->should_free_name) | |
246 | kfree((void *)xattr->name); | |
247 | if (xattr->should_free_val) | |
248 | kfree((void *)xattr->val); | |
249 | ||
250 | kfree(xattr); | |
251 | } | |
252 | ||
253 | static int __remove_xattr(struct ceph_inode_info *ci, | |
254 | struct ceph_inode_xattr *xattr) | |
255 | { | |
256 | if (!xattr) | |
257 | return -EOPNOTSUPP; | |
258 | ||
259 | rb_erase(&xattr->node, &ci->i_xattrs.index); | |
260 | ||
261 | if (xattr->should_free_name) | |
262 | kfree((void *)xattr->name); | |
263 | if (xattr->should_free_val) | |
264 | kfree((void *)xattr->val); | |
265 | ||
266 | ci->i_xattrs.names_size -= xattr->name_len; | |
267 | ci->i_xattrs.vals_size -= xattr->val_len; | |
268 | ci->i_xattrs.count--; | |
269 | kfree(xattr); | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
274 | static int __remove_xattr_by_name(struct ceph_inode_info *ci, | |
275 | const char *name) | |
276 | { | |
277 | struct rb_node **p; | |
278 | struct ceph_inode_xattr *xattr; | |
279 | int err; | |
280 | ||
281 | p = &ci->i_xattrs.index.rb_node; | |
282 | xattr = __get_xattr(ci, name); | |
283 | err = __remove_xattr(ci, xattr); | |
284 | return err; | |
285 | } | |
286 | ||
287 | static char *__copy_xattr_names(struct ceph_inode_info *ci, | |
288 | char *dest) | |
289 | { | |
290 | struct rb_node *p; | |
291 | struct ceph_inode_xattr *xattr = NULL; | |
292 | ||
293 | p = rb_first(&ci->i_xattrs.index); | |
294 | dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count); | |
295 | ||
296 | while (p) { | |
297 | xattr = rb_entry(p, struct ceph_inode_xattr, node); | |
298 | memcpy(dest, xattr->name, xattr->name_len); | |
299 | dest[xattr->name_len] = '\0'; | |
300 | ||
301 | dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name, | |
302 | xattr->name_len, ci->i_xattrs.names_size); | |
303 | ||
304 | dest += xattr->name_len + 1; | |
305 | p = rb_next(p); | |
306 | } | |
307 | ||
308 | return dest; | |
309 | } | |
310 | ||
311 | void __ceph_destroy_xattrs(struct ceph_inode_info *ci) | |
312 | { | |
313 | struct rb_node *p, *tmp; | |
314 | struct ceph_inode_xattr *xattr = NULL; | |
315 | ||
316 | p = rb_first(&ci->i_xattrs.index); | |
317 | ||
318 | dout("__ceph_destroy_xattrs p=%p\n", p); | |
319 | ||
320 | while (p) { | |
321 | xattr = rb_entry(p, struct ceph_inode_xattr, node); | |
322 | tmp = p; | |
323 | p = rb_next(tmp); | |
324 | dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p, | |
325 | xattr->name_len, xattr->name); | |
326 | rb_erase(tmp, &ci->i_xattrs.index); | |
327 | ||
328 | __free_xattr(xattr); | |
329 | } | |
330 | ||
331 | ci->i_xattrs.names_size = 0; | |
332 | ci->i_xattrs.vals_size = 0; | |
333 | ci->i_xattrs.index_version = 0; | |
334 | ci->i_xattrs.count = 0; | |
335 | ci->i_xattrs.index = RB_ROOT; | |
336 | } | |
337 | ||
338 | static int __build_xattrs(struct inode *inode) | |
339 | { | |
340 | u32 namelen; | |
341 | u32 numattr = 0; | |
342 | void *p, *end; | |
343 | u32 len; | |
344 | const char *name, *val; | |
345 | struct ceph_inode_info *ci = ceph_inode(inode); | |
346 | int xattr_version; | |
347 | struct ceph_inode_xattr **xattrs = NULL; | |
63ff78b2 | 348 | int err = 0; |
355da1eb SW |
349 | int i; |
350 | ||
351 | dout("__build_xattrs() len=%d\n", | |
352 | ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0); | |
353 | ||
354 | if (ci->i_xattrs.index_version >= ci->i_xattrs.version) | |
355 | return 0; /* already built */ | |
356 | ||
357 | __ceph_destroy_xattrs(ci); | |
358 | ||
359 | start: | |
360 | /* updated internal xattr rb tree */ | |
361 | if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) { | |
362 | p = ci->i_xattrs.blob->vec.iov_base; | |
363 | end = p + ci->i_xattrs.blob->vec.iov_len; | |
364 | ceph_decode_32_safe(&p, end, numattr, bad); | |
365 | xattr_version = ci->i_xattrs.version; | |
366 | spin_unlock(&inode->i_lock); | |
367 | ||
368 | xattrs = kcalloc(numattr, sizeof(struct ceph_xattr *), | |
369 | GFP_NOFS); | |
370 | err = -ENOMEM; | |
371 | if (!xattrs) | |
372 | goto bad_lock; | |
373 | memset(xattrs, 0, numattr*sizeof(struct ceph_xattr *)); | |
374 | for (i = 0; i < numattr; i++) { | |
375 | xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr), | |
376 | GFP_NOFS); | |
377 | if (!xattrs[i]) | |
378 | goto bad_lock; | |
379 | } | |
380 | ||
381 | spin_lock(&inode->i_lock); | |
382 | if (ci->i_xattrs.version != xattr_version) { | |
383 | /* lost a race, retry */ | |
384 | for (i = 0; i < numattr; i++) | |
385 | kfree(xattrs[i]); | |
386 | kfree(xattrs); | |
387 | goto start; | |
388 | } | |
389 | err = -EIO; | |
390 | while (numattr--) { | |
391 | ceph_decode_32_safe(&p, end, len, bad); | |
392 | namelen = len; | |
393 | name = p; | |
394 | p += len; | |
395 | ceph_decode_32_safe(&p, end, len, bad); | |
396 | val = p; | |
397 | p += len; | |
398 | ||
399 | err = __set_xattr(ci, name, namelen, val, len, | |
400 | 0, 0, 0, &xattrs[numattr]); | |
401 | ||
402 | if (err < 0) | |
403 | goto bad; | |
404 | } | |
405 | kfree(xattrs); | |
406 | } | |
407 | ci->i_xattrs.index_version = ci->i_xattrs.version; | |
408 | ci->i_xattrs.dirty = false; | |
409 | ||
410 | return err; | |
411 | bad_lock: | |
412 | spin_lock(&inode->i_lock); | |
413 | bad: | |
414 | if (xattrs) { | |
415 | for (i = 0; i < numattr; i++) | |
416 | kfree(xattrs[i]); | |
417 | kfree(xattrs); | |
418 | } | |
419 | ci->i_xattrs.names_size = 0; | |
420 | return err; | |
421 | } | |
422 | ||
423 | static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size, | |
424 | int val_size) | |
425 | { | |
426 | /* | |
427 | * 4 bytes for the length, and additional 4 bytes per each xattr name, | |
428 | * 4 bytes per each value | |
429 | */ | |
430 | int size = 4 + ci->i_xattrs.count*(4 + 4) + | |
431 | ci->i_xattrs.names_size + | |
432 | ci->i_xattrs.vals_size; | |
433 | dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n", | |
434 | ci->i_xattrs.count, ci->i_xattrs.names_size, | |
435 | ci->i_xattrs.vals_size); | |
436 | ||
437 | if (name_size) | |
438 | size += 4 + 4 + name_size + val_size; | |
439 | ||
440 | return size; | |
441 | } | |
442 | ||
443 | /* | |
444 | * If there are dirty xattrs, reencode xattrs into the prealloc_blob | |
445 | * and swap into place. | |
446 | */ | |
447 | void __ceph_build_xattrs_blob(struct ceph_inode_info *ci) | |
448 | { | |
449 | struct rb_node *p; | |
450 | struct ceph_inode_xattr *xattr = NULL; | |
451 | void *dest; | |
452 | ||
453 | dout("__build_xattrs_blob %p\n", &ci->vfs_inode); | |
454 | if (ci->i_xattrs.dirty) { | |
455 | int need = __get_required_blob_size(ci, 0, 0); | |
456 | ||
457 | BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len); | |
458 | ||
459 | p = rb_first(&ci->i_xattrs.index); | |
460 | dest = ci->i_xattrs.prealloc_blob->vec.iov_base; | |
461 | ||
462 | ceph_encode_32(&dest, ci->i_xattrs.count); | |
463 | while (p) { | |
464 | xattr = rb_entry(p, struct ceph_inode_xattr, node); | |
465 | ||
466 | ceph_encode_32(&dest, xattr->name_len); | |
467 | memcpy(dest, xattr->name, xattr->name_len); | |
468 | dest += xattr->name_len; | |
469 | ceph_encode_32(&dest, xattr->val_len); | |
470 | memcpy(dest, xattr->val, xattr->val_len); | |
471 | dest += xattr->val_len; | |
472 | ||
473 | p = rb_next(p); | |
474 | } | |
475 | ||
476 | /* adjust buffer len; it may be larger than we need */ | |
477 | ci->i_xattrs.prealloc_blob->vec.iov_len = | |
478 | dest - ci->i_xattrs.prealloc_blob->vec.iov_base; | |
479 | ||
b6c1d5b8 SW |
480 | if (ci->i_xattrs.blob) |
481 | ceph_buffer_put(ci->i_xattrs.blob); | |
355da1eb SW |
482 | ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob; |
483 | ci->i_xattrs.prealloc_blob = NULL; | |
484 | ci->i_xattrs.dirty = false; | |
485 | } | |
486 | } | |
487 | ||
488 | ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value, | |
489 | size_t size) | |
490 | { | |
491 | struct inode *inode = dentry->d_inode; | |
492 | struct ceph_inode_info *ci = ceph_inode(inode); | |
493 | struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode); | |
494 | int err; | |
495 | struct ceph_inode_xattr *xattr; | |
496 | struct ceph_vxattr_cb *vxattr = NULL; | |
497 | ||
498 | if (!ceph_is_valid_xattr(name)) | |
499 | return -ENODATA; | |
500 | ||
501 | /* let's see if a virtual xattr was requested */ | |
502 | if (vxattrs) | |
503 | vxattr = ceph_match_vxattr(vxattrs, name); | |
504 | ||
505 | spin_lock(&inode->i_lock); | |
506 | dout("getxattr %p ver=%lld index_ver=%lld\n", inode, | |
507 | ci->i_xattrs.version, ci->i_xattrs.index_version); | |
508 | ||
509 | if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) && | |
510 | (ci->i_xattrs.index_version >= ci->i_xattrs.version)) { | |
511 | goto get_xattr; | |
512 | } else { | |
513 | spin_unlock(&inode->i_lock); | |
514 | /* get xattrs from mds (if we don't already have them) */ | |
515 | err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR); | |
516 | if (err) | |
517 | return err; | |
518 | } | |
519 | ||
520 | spin_lock(&inode->i_lock); | |
521 | ||
522 | if (vxattr && vxattr->readonly) { | |
523 | err = vxattr->getxattr_cb(ci, value, size); | |
524 | goto out; | |
525 | } | |
526 | ||
527 | err = __build_xattrs(inode); | |
528 | if (err < 0) | |
529 | goto out; | |
530 | ||
531 | get_xattr: | |
532 | err = -ENODATA; /* == ENOATTR */ | |
533 | xattr = __get_xattr(ci, name); | |
534 | if (!xattr) { | |
535 | if (vxattr) | |
536 | err = vxattr->getxattr_cb(ci, value, size); | |
537 | goto out; | |
538 | } | |
539 | ||
540 | err = -ERANGE; | |
541 | if (size && size < xattr->val_len) | |
542 | goto out; | |
543 | ||
544 | err = xattr->val_len; | |
545 | if (size == 0) | |
546 | goto out; | |
547 | ||
548 | memcpy(value, xattr->val, xattr->val_len); | |
549 | ||
550 | out: | |
551 | spin_unlock(&inode->i_lock); | |
552 | return err; | |
553 | } | |
554 | ||
555 | ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size) | |
556 | { | |
557 | struct inode *inode = dentry->d_inode; | |
558 | struct ceph_inode_info *ci = ceph_inode(inode); | |
559 | struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode); | |
560 | u32 vir_namelen = 0; | |
561 | u32 namelen; | |
562 | int err; | |
563 | u32 len; | |
564 | int i; | |
565 | ||
566 | spin_lock(&inode->i_lock); | |
567 | dout("listxattr %p ver=%lld index_ver=%lld\n", inode, | |
568 | ci->i_xattrs.version, ci->i_xattrs.index_version); | |
569 | ||
570 | if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) && | |
571 | (ci->i_xattrs.index_version > ci->i_xattrs.version)) { | |
572 | goto list_xattr; | |
573 | } else { | |
574 | spin_unlock(&inode->i_lock); | |
575 | err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR); | |
576 | if (err) | |
577 | return err; | |
578 | } | |
579 | ||
580 | spin_lock(&inode->i_lock); | |
581 | ||
582 | err = __build_xattrs(inode); | |
583 | if (err < 0) | |
584 | goto out; | |
585 | ||
586 | list_xattr: | |
587 | vir_namelen = 0; | |
588 | /* include virtual dir xattrs */ | |
589 | if (vxattrs) | |
590 | for (i = 0; vxattrs[i].name; i++) | |
591 | vir_namelen += strlen(vxattrs[i].name) + 1; | |
592 | /* adding 1 byte per each variable due to the null termination */ | |
593 | namelen = vir_namelen + ci->i_xattrs.names_size + ci->i_xattrs.count; | |
594 | err = -ERANGE; | |
595 | if (size && namelen > size) | |
596 | goto out; | |
597 | ||
598 | err = namelen; | |
599 | if (size == 0) | |
600 | goto out; | |
601 | ||
602 | names = __copy_xattr_names(ci, names); | |
603 | ||
604 | /* virtual xattr names, too */ | |
605 | if (vxattrs) | |
606 | for (i = 0; vxattrs[i].name; i++) { | |
607 | len = sprintf(names, "%s", vxattrs[i].name); | |
608 | names += len + 1; | |
609 | } | |
610 | ||
611 | out: | |
612 | spin_unlock(&inode->i_lock); | |
613 | return err; | |
614 | } | |
615 | ||
616 | static int ceph_sync_setxattr(struct dentry *dentry, const char *name, | |
617 | const char *value, size_t size, int flags) | |
618 | { | |
619 | struct ceph_client *client = ceph_client(dentry->d_sb); | |
620 | struct inode *inode = dentry->d_inode; | |
621 | struct ceph_inode_info *ci = ceph_inode(inode); | |
622 | struct inode *parent_inode = dentry->d_parent->d_inode; | |
623 | struct ceph_mds_request *req; | |
624 | struct ceph_mds_client *mdsc = &client->mdsc; | |
625 | int err; | |
626 | int i, nr_pages; | |
627 | struct page **pages = NULL; | |
628 | void *kaddr; | |
629 | ||
630 | /* copy value into some pages */ | |
631 | nr_pages = calc_pages_for(0, size); | |
632 | if (nr_pages) { | |
633 | pages = kmalloc(sizeof(pages[0])*nr_pages, GFP_NOFS); | |
634 | if (!pages) | |
635 | return -ENOMEM; | |
636 | err = -ENOMEM; | |
637 | for (i = 0; i < nr_pages; i++) { | |
31459fe4 | 638 | pages[i] = __page_cache_alloc(GFP_NOFS); |
355da1eb SW |
639 | if (!pages[i]) { |
640 | nr_pages = i; | |
641 | goto out; | |
642 | } | |
643 | kaddr = kmap(pages[i]); | |
644 | memcpy(kaddr, value + i*PAGE_CACHE_SIZE, | |
645 | min(PAGE_CACHE_SIZE, size-i*PAGE_CACHE_SIZE)); | |
646 | } | |
647 | } | |
648 | ||
649 | dout("setxattr value=%.*s\n", (int)size, value); | |
650 | ||
651 | /* do request */ | |
652 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETXATTR, | |
653 | USE_AUTH_MDS); | |
60d87733 JL |
654 | if (IS_ERR(req)) { |
655 | err = PTR_ERR(req); | |
656 | goto out; | |
657 | } | |
355da1eb SW |
658 | req->r_inode = igrab(inode); |
659 | req->r_inode_drop = CEPH_CAP_XATTR_SHARED; | |
660 | req->r_num_caps = 1; | |
661 | req->r_args.setxattr.flags = cpu_to_le32(flags); | |
662 | req->r_path2 = kstrdup(name, GFP_NOFS); | |
663 | ||
664 | req->r_pages = pages; | |
665 | req->r_num_pages = nr_pages; | |
666 | req->r_data_len = size; | |
667 | ||
668 | dout("xattr.ver (before): %lld\n", ci->i_xattrs.version); | |
669 | err = ceph_mdsc_do_request(mdsc, parent_inode, req); | |
670 | ceph_mdsc_put_request(req); | |
671 | dout("xattr.ver (after): %lld\n", ci->i_xattrs.version); | |
672 | ||
673 | out: | |
674 | if (pages) { | |
675 | for (i = 0; i < nr_pages; i++) | |
676 | __free_page(pages[i]); | |
677 | kfree(pages); | |
678 | } | |
679 | return err; | |
680 | } | |
681 | ||
682 | int ceph_setxattr(struct dentry *dentry, const char *name, | |
683 | const void *value, size_t size, int flags) | |
684 | { | |
685 | struct inode *inode = dentry->d_inode; | |
686 | struct ceph_inode_info *ci = ceph_inode(inode); | |
687 | struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode); | |
688 | int err; | |
689 | int name_len = strlen(name); | |
690 | int val_len = size; | |
691 | char *newname = NULL; | |
692 | char *newval = NULL; | |
693 | struct ceph_inode_xattr *xattr = NULL; | |
694 | int issued; | |
695 | int required_blob_size; | |
696 | ||
697 | if (ceph_snap(inode) != CEPH_NOSNAP) | |
698 | return -EROFS; | |
699 | ||
700 | if (!ceph_is_valid_xattr(name)) | |
701 | return -EOPNOTSUPP; | |
702 | ||
703 | if (vxattrs) { | |
704 | struct ceph_vxattr_cb *vxattr = | |
705 | ceph_match_vxattr(vxattrs, name); | |
706 | if (vxattr && vxattr->readonly) | |
707 | return -EOPNOTSUPP; | |
708 | } | |
709 | ||
710 | /* preallocate memory for xattr name, value, index node */ | |
711 | err = -ENOMEM; | |
712 | newname = kmalloc(name_len + 1, GFP_NOFS); | |
713 | if (!newname) | |
714 | goto out; | |
715 | memcpy(newname, name, name_len + 1); | |
716 | ||
717 | if (val_len) { | |
718 | newval = kmalloc(val_len + 1, GFP_NOFS); | |
719 | if (!newval) | |
720 | goto out; | |
721 | memcpy(newval, value, val_len); | |
722 | newval[val_len] = '\0'; | |
723 | } | |
724 | ||
725 | xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS); | |
726 | if (!xattr) | |
727 | goto out; | |
728 | ||
729 | spin_lock(&inode->i_lock); | |
730 | retry: | |
731 | issued = __ceph_caps_issued(ci, NULL); | |
732 | if (!(issued & CEPH_CAP_XATTR_EXCL)) | |
733 | goto do_sync; | |
734 | __build_xattrs(inode); | |
735 | ||
736 | required_blob_size = __get_required_blob_size(ci, name_len, val_len); | |
737 | ||
738 | if (!ci->i_xattrs.prealloc_blob || | |
739 | required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) { | |
740 | struct ceph_buffer *blob = NULL; | |
741 | ||
742 | spin_unlock(&inode->i_lock); | |
743 | dout(" preaallocating new blob size=%d\n", required_blob_size); | |
b6c1d5b8 | 744 | blob = ceph_buffer_new(required_blob_size, GFP_NOFS); |
355da1eb SW |
745 | if (!blob) |
746 | goto out; | |
747 | spin_lock(&inode->i_lock); | |
b6c1d5b8 SW |
748 | if (ci->i_xattrs.prealloc_blob) |
749 | ceph_buffer_put(ci->i_xattrs.prealloc_blob); | |
355da1eb SW |
750 | ci->i_xattrs.prealloc_blob = blob; |
751 | goto retry; | |
752 | } | |
753 | ||
754 | dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued)); | |
755 | err = __set_xattr(ci, newname, name_len, newval, | |
756 | val_len, 1, 1, 1, &xattr); | |
757 | __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL); | |
758 | ci->i_xattrs.dirty = true; | |
759 | inode->i_ctime = CURRENT_TIME; | |
760 | spin_unlock(&inode->i_lock); | |
761 | ||
762 | return err; | |
763 | ||
764 | do_sync: | |
765 | spin_unlock(&inode->i_lock); | |
766 | err = ceph_sync_setxattr(dentry, name, value, size, flags); | |
767 | out: | |
768 | kfree(newname); | |
769 | kfree(newval); | |
770 | kfree(xattr); | |
771 | return err; | |
772 | } | |
773 | ||
774 | static int ceph_send_removexattr(struct dentry *dentry, const char *name) | |
775 | { | |
776 | struct ceph_client *client = ceph_client(dentry->d_sb); | |
777 | struct ceph_mds_client *mdsc = &client->mdsc; | |
778 | struct inode *inode = dentry->d_inode; | |
779 | struct inode *parent_inode = dentry->d_parent->d_inode; | |
780 | struct ceph_mds_request *req; | |
781 | int err; | |
782 | ||
783 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RMXATTR, | |
784 | USE_AUTH_MDS); | |
785 | if (IS_ERR(req)) | |
786 | return PTR_ERR(req); | |
787 | req->r_inode = igrab(inode); | |
788 | req->r_inode_drop = CEPH_CAP_XATTR_SHARED; | |
789 | req->r_num_caps = 1; | |
790 | req->r_path2 = kstrdup(name, GFP_NOFS); | |
791 | ||
792 | err = ceph_mdsc_do_request(mdsc, parent_inode, req); | |
793 | ceph_mdsc_put_request(req); | |
794 | return err; | |
795 | } | |
796 | ||
797 | int ceph_removexattr(struct dentry *dentry, const char *name) | |
798 | { | |
799 | struct inode *inode = dentry->d_inode; | |
800 | struct ceph_inode_info *ci = ceph_inode(inode); | |
801 | struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode); | |
802 | int issued; | |
803 | int err; | |
804 | ||
805 | if (ceph_snap(inode) != CEPH_NOSNAP) | |
806 | return -EROFS; | |
807 | ||
808 | if (!ceph_is_valid_xattr(name)) | |
809 | return -EOPNOTSUPP; | |
810 | ||
811 | if (vxattrs) { | |
812 | struct ceph_vxattr_cb *vxattr = | |
813 | ceph_match_vxattr(vxattrs, name); | |
814 | if (vxattr && vxattr->readonly) | |
815 | return -EOPNOTSUPP; | |
816 | } | |
817 | ||
818 | spin_lock(&inode->i_lock); | |
819 | __build_xattrs(inode); | |
820 | issued = __ceph_caps_issued(ci, NULL); | |
821 | dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued)); | |
822 | ||
823 | if (!(issued & CEPH_CAP_XATTR_EXCL)) | |
824 | goto do_sync; | |
825 | ||
826 | err = __remove_xattr_by_name(ceph_inode(inode), name); | |
827 | __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL); | |
828 | ci->i_xattrs.dirty = true; | |
829 | inode->i_ctime = CURRENT_TIME; | |
830 | ||
831 | spin_unlock(&inode->i_lock); | |
832 | ||
833 | return err; | |
834 | do_sync: | |
835 | spin_unlock(&inode->i_lock); | |
836 | err = ceph_send_removexattr(dentry, name); | |
837 | return err; | |
838 | } | |
839 |