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ceph: use ceph. prefix for virtual xattrs
[net-next-2.6.git] / fs / ceph / xattr.c
CommitLineData
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
8static bool ceph_is_valid_xattr(const char *name)
9{
1a756278
SW		 10 return !strncmp(name, "ceph.", 5) ||
11 !strncmp(name, XATTR_SECURITY_PREFIX,
355da1eb
SW		 12 XATTR_SECURITY_PREFIX_LEN) ||
13 !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) ||
14 !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
15}
16
17/*
18 * These define virtual xattrs exposing the recursive directory
19 * statistics and layout metadata.
20 */
21struct ceph_vxattr_cb {
22 bool readonly;
23 char *name;
24 size_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val,
25 size_t size);
26};
27
28/* directories */
29
30static size_t ceph_vxattrcb_entries(struct ceph_inode_info *ci, char *val,
31 size_t size)
32{
33 return snprintf(val, size, "%lld", ci->i_files + ci->i_subdirs);
34}
35
36static size_t ceph_vxattrcb_files(struct ceph_inode_info *ci, char *val,
37 size_t size)
38{
39 return snprintf(val, size, "%lld", ci->i_files);
40}
41
42static size_t ceph_vxattrcb_subdirs(struct ceph_inode_info *ci, char *val,
43 size_t size)
44{
45 return snprintf(val, size, "%lld", ci->i_subdirs);
46}
47
48static size_t ceph_vxattrcb_rentries(struct ceph_inode_info *ci, char *val,
49 size_t size)
50{
51 return snprintf(val, size, "%lld", ci->i_rfiles + ci->i_rsubdirs);
52}
53
54static size_t ceph_vxattrcb_rfiles(struct ceph_inode_info *ci, char *val,
55 size_t size)
56{
57 return snprintf(val, size, "%lld", ci->i_rfiles);
58}
59
60static size_t ceph_vxattrcb_rsubdirs(struct ceph_inode_info *ci, char *val,
61 size_t size)
62{
63 return snprintf(val, size, "%lld", ci->i_rsubdirs);
64}
65
66static size_t ceph_vxattrcb_rbytes(struct ceph_inode_info *ci, char *val,
67 size_t size)
68{
69 return snprintf(val, size, "%lld", ci->i_rbytes);
70}
71
72static size_t ceph_vxattrcb_rctime(struct ceph_inode_info *ci, char *val,
73 size_t size)
74{
75 return snprintf(val, size, "%ld.%ld", (long)ci->i_rctime.tv_sec,
76 (long)ci->i_rctime.tv_nsec);
77}
78
79static struct ceph_vxattr_cb ceph_dir_vxattrs[] = {
1a756278
SW		 80 { true, "ceph.dir.entries", ceph_vxattrcb_entries},
81 { true, "ceph.dir.files", ceph_vxattrcb_files},
82 { true, "ceph.dir.subdirs", ceph_vxattrcb_subdirs},
83 { true, "ceph.dir.rentries", ceph_vxattrcb_rentries},
84 { true, "ceph.dir.rfiles", ceph_vxattrcb_rfiles},
85 { true, "ceph.dir.rsubdirs", ceph_vxattrcb_rsubdirs},
86 { true, "ceph.dir.rbytes", ceph_vxattrcb_rbytes},
87 { true, "ceph.dir.rctime", ceph_vxattrcb_rctime},
355da1eb
SW		 88 { true, NULL, NULL }
89};
90
91/* files */
92
93static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
94 size_t size)
95{
b195befd
SW		 96 int ret;
97
98 ret = snprintf(val, size,
355da1eb
SW		 99 "chunk_bytes=%lld\nstripe_count=%lld\nobject_size=%lld\n",
100 (unsigned long long)ceph_file_layout_su(ci->i_layout),
101 (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
102 (unsigned long long)ceph_file_layout_object_size(ci->i_layout));
b195befd
SW		 103 if (ceph_file_layout_pg_preferred(ci->i_layout))
104 ret += snprintf(val + ret, size, "preferred_osd=%lld\n",
105 (unsigned long long)ceph_file_layout_pg_preferred(
106 ci->i_layout));
107 return ret;
355da1eb
SW		 108}
109
110static struct ceph_vxattr_cb ceph_file_vxattrs[] = {
1a756278 111 { true, "ceph.layout", ceph_vxattrcb_layout},
355da1eb
SW		 112 { NULL, NULL }
113};
114
115static struct ceph_vxattr_cb *ceph_inode_vxattrs(struct inode *inode)
116{
117 if (S_ISDIR(inode->i_mode))
118 return ceph_dir_vxattrs;
119 else if (S_ISREG(inode->i_mode))
120 return ceph_file_vxattrs;
121 return NULL;
122}
123
124static struct ceph_vxattr_cb *ceph_match_vxattr(struct ceph_vxattr_cb *vxattr,
125 const char *name)
126{
127 do {
128 if (strcmp(vxattr->name, name) == 0)
129 return vxattr;
130 vxattr++;
131 } while (vxattr->name);
132 return NULL;
133}
134
135static int __set_xattr(struct ceph_inode_info *ci,
136 const char *name, int name_len,
137 const char *val, int val_len,
138 int dirty,
139 int should_free_name, int should_free_val,
140 struct ceph_inode_xattr **newxattr)
141{
142 struct rb_node **p;
143 struct rb_node *parent = NULL;
144 struct ceph_inode_xattr *xattr = NULL;
145 int c;
146 int new = 0;
147
148 p = &ci->i_xattrs.index.rb_node;
149 while (*p) {
150 parent = *p;
151 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
152 c = strncmp(name, xattr->name, min(name_len, xattr->name_len));
153 if (c < 0)
154 p = &(*p)->rb_left;
155 else if (c > 0)
156 p = &(*p)->rb_right;
157 else {
158 if (name_len == xattr->name_len)
159 break;
160 else if (name_len < xattr->name_len)
161 p = &(*p)->rb_left;
162 else
163 p = &(*p)->rb_right;
164 }
165 xattr = NULL;
166 }
167
168 if (!xattr) {
169 new = 1;
170 xattr = *newxattr;
171 xattr->name = name;
172 xattr->name_len = name_len;
173 xattr->should_free_name = should_free_name;
174
175 ci->i_xattrs.count++;
176 dout("__set_xattr count=%d\n", ci->i_xattrs.count);
177 } else {
178 kfree(*newxattr);
179 *newxattr = NULL;
180 if (xattr->should_free_val)
181 kfree((void *)xattr->val);
182
183 if (should_free_name) {
184 kfree((void *)name);
185 name = xattr->name;
186 }
187 ci->i_xattrs.names_size -= xattr->name_len;
188 ci->i_xattrs.vals_size -= xattr->val_len;
189 }
355da1eb
SW		 190 ci->i_xattrs.names_size += name_len;
191 ci->i_xattrs.vals_size += val_len;
192 if (val)
193 xattr->val = val;
194 else
195 xattr->val = "";
196
197 xattr->val_len = val_len;
198 xattr->dirty = dirty;
199 xattr->should_free_val = (val && should_free_val);
200
201 if (new) {
202 rb_link_node(&xattr->node, parent, p);
203 rb_insert_color(&xattr->node, &ci->i_xattrs.index);
204 dout("__set_xattr_val p=%p\n", p);
205 }
206
207 dout("__set_xattr_val added %llx.%llx xattr %p %s=%.*s\n",
208 ceph_vinop(&ci->vfs_inode), xattr, name, val_len, val);
209
210 return 0;
211}
212
213static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci,
214 const char *name)
215{
216 struct rb_node **p;
217 struct rb_node *parent = NULL;
218 struct ceph_inode_xattr *xattr = NULL;
219 int c;
220
221 p = &ci->i_xattrs.index.rb_node;
222 while (*p) {
223 parent = *p;
224 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
225 c = strncmp(name, xattr->name, xattr->name_len);
226 if (c < 0)
227 p = &(*p)->rb_left;
228 else if (c > 0)
229 p = &(*p)->rb_right;
230 else {
231 dout("__get_xattr %s: found %.*s\n", name,
232 xattr->val_len, xattr->val);
233 return xattr;
234 }
235 }
236
237 dout("__get_xattr %s: not found\n", name);
238
239 return NULL;
240}
241
242static void __free_xattr(struct ceph_inode_xattr *xattr)
243{
244 BUG_ON(!xattr);
245
246 if (xattr->should_free_name)
247 kfree((void *)xattr->name);
248 if (xattr->should_free_val)
249 kfree((void *)xattr->val);
250
251 kfree(xattr);
252}
253
254static int __remove_xattr(struct ceph_inode_info *ci,
255 struct ceph_inode_xattr *xattr)
256{
257 if (!xattr)
258 return -EOPNOTSUPP;
259
260 rb_erase(&xattr->node, &ci->i_xattrs.index);
261
262 if (xattr->should_free_name)
263 kfree((void *)xattr->name);
264 if (xattr->should_free_val)
265 kfree((void *)xattr->val);
266
267 ci->i_xattrs.names_size -= xattr->name_len;
268 ci->i_xattrs.vals_size -= xattr->val_len;
269 ci->i_xattrs.count--;
270 kfree(xattr);
271
272 return 0;
273}
274
275static int __remove_xattr_by_name(struct ceph_inode_info *ci,
276 const char *name)
277{
278 struct rb_node **p;
279 struct ceph_inode_xattr *xattr;
280 int err;
281
282 p = &ci->i_xattrs.index.rb_node;
283 xattr = __get_xattr(ci, name);
284 err = __remove_xattr(ci, xattr);
285 return err;
286}
287
288static char *__copy_xattr_names(struct ceph_inode_info *ci,
289 char *dest)
290{
291 struct rb_node *p;
292 struct ceph_inode_xattr *xattr = NULL;
293
294 p = rb_first(&ci->i_xattrs.index);
295 dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count);
296
297 while (p) {
298 xattr = rb_entry(p, struct ceph_inode_xattr, node);
299 memcpy(dest, xattr->name, xattr->name_len);
300 dest[xattr->name_len] = '\0';
301
302 dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name,
303 xattr->name_len, ci->i_xattrs.names_size);
304
305 dest += xattr->name_len + 1;
306 p = rb_next(p);
307 }
308
309 return dest;
310}
311
312void __ceph_destroy_xattrs(struct ceph_inode_info *ci)
313{
314 struct rb_node *p, *tmp;
315 struct ceph_inode_xattr *xattr = NULL;
316
317 p = rb_first(&ci->i_xattrs.index);
318
319 dout("__ceph_destroy_xattrs p=%p\n", p);
320
321 while (p) {
322 xattr = rb_entry(p, struct ceph_inode_xattr, node);
323 tmp = p;
324 p = rb_next(tmp);
325 dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p,
326 xattr->name_len, xattr->name);
327 rb_erase(tmp, &ci->i_xattrs.index);
328
329 __free_xattr(xattr);
330 }
331
332 ci->i_xattrs.names_size = 0;
333 ci->i_xattrs.vals_size = 0;
334 ci->i_xattrs.index_version = 0;
335 ci->i_xattrs.count = 0;
336 ci->i_xattrs.index = RB_ROOT;
337}
338
339static int __build_xattrs(struct inode *inode)
340{
341 u32 namelen;
342 u32 numattr = 0;
343 void *p, *end;
344 u32 len;
345 const char *name, *val;
346 struct ceph_inode_info *ci = ceph_inode(inode);
347 int xattr_version;
348 struct ceph_inode_xattr **xattrs = NULL;
63ff78b2 349 int err = 0;
355da1eb
SW		 350 int i;
351
352 dout("__build_xattrs() len=%d\n",
353 ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0);
354
355 if (ci->i_xattrs.index_version >= ci->i_xattrs.version)
356 return 0; /* already built */
357
358 __ceph_destroy_xattrs(ci);
359
360start:
361 /* updated internal xattr rb tree */
362 if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) {
363 p = ci->i_xattrs.blob->vec.iov_base;
364 end = p + ci->i_xattrs.blob->vec.iov_len;
365 ceph_decode_32_safe(&p, end, numattr, bad);
366 xattr_version = ci->i_xattrs.version;
367 spin_unlock(&inode->i_lock);
368
369 xattrs = kcalloc(numattr, sizeof(struct ceph_xattr *),
370 GFP_NOFS);
371 err = -ENOMEM;
372 if (!xattrs)
373 goto bad_lock;
374 memset(xattrs, 0, numattr*sizeof(struct ceph_xattr *));
375 for (i = 0; i < numattr; i++) {
376 xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr),
377 GFP_NOFS);
378 if (!xattrs[i])
379 goto bad_lock;
380 }
381
382 spin_lock(&inode->i_lock);
383 if (ci->i_xattrs.version != xattr_version) {
384 /* lost a race, retry */
385 for (i = 0; i < numattr; i++)
386 kfree(xattrs[i]);
387 kfree(xattrs);
388 goto start;
389 }
390 err = -EIO;
391 while (numattr--) {
392 ceph_decode_32_safe(&p, end, len, bad);
393 namelen = len;
394 name = p;
395 p += len;
396 ceph_decode_32_safe(&p, end, len, bad);
397 val = p;
398 p += len;
399
400 err = __set_xattr(ci, name, namelen, val, len,
401 0, 0, 0, &xattrs[numattr]);
402
403 if (err < 0)
404 goto bad;
405 }
406 kfree(xattrs);
407 }
408 ci->i_xattrs.index_version = ci->i_xattrs.version;
409 ci->i_xattrs.dirty = false;
410
411 return err;
412bad_lock:
413 spin_lock(&inode->i_lock);
414bad:
415 if (xattrs) {
416 for (i = 0; i < numattr; i++)
417 kfree(xattrs[i]);
418 kfree(xattrs);
419 }
420 ci->i_xattrs.names_size = 0;
421 return err;
422}
423
424static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size,
425 int val_size)
426{
427 /*
428 * 4 bytes for the length, and additional 4 bytes per each xattr name,
429 * 4 bytes per each value
430 */
431 int size = 4 + ci->i_xattrs.count*(4 + 4) +
432 ci->i_xattrs.names_size +
433 ci->i_xattrs.vals_size;
434 dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n",
435 ci->i_xattrs.count, ci->i_xattrs.names_size,
436 ci->i_xattrs.vals_size);
437
438 if (name_size)
439 size += 4 + 4 + name_size + val_size;
440
441 return size;
442}
443
444/*
445 * If there are dirty xattrs, reencode xattrs into the prealloc_blob
446 * and swap into place.
447 */
448void __ceph_build_xattrs_blob(struct ceph_inode_info *ci)
449{
450 struct rb_node *p;
451 struct ceph_inode_xattr *xattr = NULL;
452 void *dest;
453
454 dout("__build_xattrs_blob %p\n", &ci->vfs_inode);
455 if (ci->i_xattrs.dirty) {
456 int need = __get_required_blob_size(ci, 0, 0);
457
458 BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len);
459
460 p = rb_first(&ci->i_xattrs.index);
461 dest = ci->i_xattrs.prealloc_blob->vec.iov_base;
462
463 ceph_encode_32(&dest, ci->i_xattrs.count);
464 while (p) {
465 xattr = rb_entry(p, struct ceph_inode_xattr, node);
466
467 ceph_encode_32(&dest, xattr->name_len);
468 memcpy(dest, xattr->name, xattr->name_len);
469 dest += xattr->name_len;
470 ceph_encode_32(&dest, xattr->val_len);
471 memcpy(dest, xattr->val, xattr->val_len);
472 dest += xattr->val_len;
473
474 p = rb_next(p);
475 }
476
477 /* adjust buffer len; it may be larger than we need */
478 ci->i_xattrs.prealloc_blob->vec.iov_len =
479 dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
480
b6c1d5b8
SW		 481 if (ci->i_xattrs.blob)
482 ceph_buffer_put(ci->i_xattrs.blob);
355da1eb
SW		 483 ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
484 ci->i_xattrs.prealloc_blob = NULL;
485 ci->i_xattrs.dirty = false;
486 }
487}
488
489ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
490 size_t size)
491{
492 struct inode *inode = dentry->d_inode;
493 struct ceph_inode_info *ci = ceph_inode(inode);
494 struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
495 int err;
496 struct ceph_inode_xattr *xattr;
497 struct ceph_vxattr_cb *vxattr = NULL;
498
499 if (!ceph_is_valid_xattr(name))
500 return -ENODATA;
501
502 /* let's see if a virtual xattr was requested */
503 if (vxattrs)
504 vxattr = ceph_match_vxattr(vxattrs, name);
505
506 spin_lock(&inode->i_lock);
507 dout("getxattr %p ver=%lld index_ver=%lld\n", inode,
508 ci->i_xattrs.version, ci->i_xattrs.index_version);
509
510 if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
511 (ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
512 goto get_xattr;
513 } else {
514 spin_unlock(&inode->i_lock);
515 /* get xattrs from mds (if we don't already have them) */
516 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
517 if (err)
518 return err;
519 }
520
521 spin_lock(&inode->i_lock);
522
523 if (vxattr && vxattr->readonly) {
524 err = vxattr->getxattr_cb(ci, value, size);
525 goto out;
526 }
527
528 err = __build_xattrs(inode);
529 if (err < 0)
530 goto out;
531
532get_xattr:
533 err = -ENODATA; /* == ENOATTR */
534 xattr = __get_xattr(ci, name);
535 if (!xattr) {
536 if (vxattr)
537 err = vxattr->getxattr_cb(ci, value, size);
538 goto out;
539 }
540
541 err = -ERANGE;
542 if (size && size < xattr->val_len)
543 goto out;
544
545 err = xattr->val_len;
546 if (size == 0)
547 goto out;
548
549 memcpy(value, xattr->val, xattr->val_len);
550
551out:
552 spin_unlock(&inode->i_lock);
553 return err;
554}
555
556ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
557{
558 struct inode *inode = dentry->d_inode;
559 struct ceph_inode_info *ci = ceph_inode(inode);
560 struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
561 u32 vir_namelen = 0;
562 u32 namelen;
563 int err;
564 u32 len;
565 int i;
566
567 spin_lock(&inode->i_lock);
568 dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
569 ci->i_xattrs.version, ci->i_xattrs.index_version);
570
571 if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
bddfa3cc 572 (ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
355da1eb
SW		 573 goto list_xattr;
574 } else {
575 spin_unlock(&inode->i_lock);
576 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
577 if (err)
578 return err;
579 }
580
581 spin_lock(&inode->i_lock);
582
583 err = __build_xattrs(inode);
584 if (err < 0)
585 goto out;
586
587list_xattr:
588 vir_namelen = 0;
589 /* include virtual dir xattrs */
590 if (vxattrs)
591 for (i = 0; vxattrs[i].name; i++)
592 vir_namelen += strlen(vxattrs[i].name) + 1;
593 /* adding 1 byte per each variable due to the null termination */
594 namelen = vir_namelen + ci->i_xattrs.names_size + ci->i_xattrs.count;
595 err = -ERANGE;
596 if (size && namelen > size)
597 goto out;
598
599 err = namelen;
600 if (size == 0)
601 goto out;
602
603 names = __copy_xattr_names(ci, names);
604
605 /* virtual xattr names, too */
606 if (vxattrs)
607 for (i = 0; vxattrs[i].name; i++) {
608 len = sprintf(names, "%s", vxattrs[i].name);
609 names += len + 1;
610 }
611
612out:
613 spin_unlock(&inode->i_lock);
614 return err;
615}
616
617static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
618 const char *value, size_t size, int flags)
619{
640ef79d 620 struct ceph_client *client = ceph_sb_to_client(dentry->d_sb);
355da1eb
SW		 621 struct inode *inode = dentry->d_inode;
622 struct ceph_inode_info *ci = ceph_inode(inode);
623 struct inode *parent_inode = dentry->d_parent->d_inode;
624 struct ceph_mds_request *req;
625 struct ceph_mds_client *mdsc = &client->mdsc;
626 int err;
627 int i, nr_pages;
628 struct page **pages = NULL;
629 void *kaddr;
630
631 /* copy value into some pages */
632 nr_pages = calc_pages_for(0, size);
633 if (nr_pages) {
634 pages = kmalloc(sizeof(pages[0])*nr_pages, GFP_NOFS);
635 if (!pages)
636 return -ENOMEM;
637 err = -ENOMEM;
638 for (i = 0; i < nr_pages; i++) {
31459fe4 639 pages[i] = __page_cache_alloc(GFP_NOFS);
355da1eb
SW		 640 if (!pages[i]) {
641 nr_pages = i;
642 goto out;
643 }
644 kaddr = kmap(pages[i]);
645 memcpy(kaddr, value + i*PAGE_CACHE_SIZE,
646 min(PAGE_CACHE_SIZE, size-i*PAGE_CACHE_SIZE));
647 }
648 }
649
650 dout("setxattr value=%.*s\n", (int)size, value);
651
652 /* do request */
653 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETXATTR,
654 USE_AUTH_MDS);
60d87733
JL		 655 if (IS_ERR(req)) {
656 err = PTR_ERR(req);
657 goto out;
658 }
355da1eb
SW		 659 req->r_inode = igrab(inode);
660 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
661 req->r_num_caps = 1;
662 req->r_args.setxattr.flags = cpu_to_le32(flags);
663 req->r_path2 = kstrdup(name, GFP_NOFS);
664
665 req->r_pages = pages;
666 req->r_num_pages = nr_pages;
667 req->r_data_len = size;
668
669 dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
670 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
671 ceph_mdsc_put_request(req);
672 dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
673
674out:
675 if (pages) {
676 for (i = 0; i < nr_pages; i++)
677 __free_page(pages[i]);
678 kfree(pages);
679 }
680 return err;
681}
682
683int ceph_setxattr(struct dentry *dentry, const char *name,
684 const void *value, size_t size, int flags)
685{
686 struct inode *inode = dentry->d_inode;
687 struct ceph_inode_info *ci = ceph_inode(inode);
688 struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
689 int err;
690 int name_len = strlen(name);
691 int val_len = size;
692 char *newname = NULL;
693 char *newval = NULL;
694 struct ceph_inode_xattr *xattr = NULL;
695 int issued;
696 int required_blob_size;
697
698 if (ceph_snap(inode) != CEPH_NOSNAP)
699 return -EROFS;
700
701 if (!ceph_is_valid_xattr(name))
702 return -EOPNOTSUPP;
703
704 if (vxattrs) {
705 struct ceph_vxattr_cb *vxattr =
706 ceph_match_vxattr(vxattrs, name);
707 if (vxattr && vxattr->readonly)
708 return -EOPNOTSUPP;
709 }
710
711 /* preallocate memory for xattr name, value, index node */
712 err = -ENOMEM;
713 newname = kmalloc(name_len + 1, GFP_NOFS);
714 if (!newname)
715 goto out;
716 memcpy(newname, name, name_len + 1);
717
718 if (val_len) {
719 newval = kmalloc(val_len + 1, GFP_NOFS);
720 if (!newval)
721 goto out;
722 memcpy(newval, value, val_len);
723 newval[val_len] = '\0';
724 }
725
726 xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS);
727 if (!xattr)
728 goto out;
729
730 spin_lock(&inode->i_lock);
731retry:
732 issued = __ceph_caps_issued(ci, NULL);
733 if (!(issued & CEPH_CAP_XATTR_EXCL))
734 goto do_sync;
735 __build_xattrs(inode);
736
737 required_blob_size = __get_required_blob_size(ci, name_len, val_len);
738
739 if (!ci->i_xattrs.prealloc_blob ||
740 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
741 struct ceph_buffer *blob = NULL;
742
743 spin_unlock(&inode->i_lock);
744 dout(" preaallocating new blob size=%d\n", required_blob_size);
b6c1d5b8 745 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
355da1eb
SW		 746 if (!blob)
747 goto out;
748 spin_lock(&inode->i_lock);
b6c1d5b8
SW		 749 if (ci->i_xattrs.prealloc_blob)
750 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
355da1eb
SW		 751 ci->i_xattrs.prealloc_blob = blob;
752 goto retry;
753 }
754
755 dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued));
756 err = __set_xattr(ci, newname, name_len, newval,
757 val_len, 1, 1, 1, &xattr);
758 __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
759 ci->i_xattrs.dirty = true;
760 inode->i_ctime = CURRENT_TIME;
761 spin_unlock(&inode->i_lock);
762
763 return err;
764
765do_sync:
766 spin_unlock(&inode->i_lock);
767 err = ceph_sync_setxattr(dentry, name, value, size, flags);
768out:
769 kfree(newname);
770 kfree(newval);
771 kfree(xattr);
772 return err;
773}
774
775static int ceph_send_removexattr(struct dentry *dentry, const char *name)
776{
640ef79d 777 struct ceph_client *client = ceph_sb_to_client(dentry->d_sb);
355da1eb
SW		 778 struct ceph_mds_client *mdsc = &client->mdsc;
779 struct inode *inode = dentry->d_inode;
780 struct inode *parent_inode = dentry->d_parent->d_inode;
781 struct ceph_mds_request *req;
782 int err;
783
784 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RMXATTR,
785 USE_AUTH_MDS);
786 if (IS_ERR(req))
787 return PTR_ERR(req);
788 req->r_inode = igrab(inode);
789 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
790 req->r_num_caps = 1;
791 req->r_path2 = kstrdup(name, GFP_NOFS);
792
793 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
794 ceph_mdsc_put_request(req);
795 return err;
796}
797
798int ceph_removexattr(struct dentry *dentry, const char *name)
799{
800 struct inode *inode = dentry->d_inode;
801 struct ceph_inode_info *ci = ceph_inode(inode);
802 struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
803 int issued;
804 int err;
805
806 if (ceph_snap(inode) != CEPH_NOSNAP)
807 return -EROFS;
808
809 if (!ceph_is_valid_xattr(name))
810 return -EOPNOTSUPP;
811
812 if (vxattrs) {
813 struct ceph_vxattr_cb *vxattr =
814 ceph_match_vxattr(vxattrs, name);
815 if (vxattr && vxattr->readonly)
816 return -EOPNOTSUPP;
817 }
818
819 spin_lock(&inode->i_lock);
820 __build_xattrs(inode);
821 issued = __ceph_caps_issued(ci, NULL);
822 dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued));
823
824 if (!(issued & CEPH_CAP_XATTR_EXCL))
825 goto do_sync;
826
827 err = __remove_xattr_by_name(ceph_inode(inode), name);
828 __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
829 ci->i_xattrs.dirty = true;
830 inode->i_ctime = CURRENT_TIME;
831
832 spin_unlock(&inode->i_lock);
833
834 return err;
835do_sync:
836 spin_unlock(&inode->i_lock);
837 err = ceph_send_removexattr(dentry, name);
838 return err;
839}
840
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