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Merge branch 'lguest' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux...
[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)
cd84db6e
YS		 340 __releases(inode->i_lock)
341 __acquires(inode->i_lock)
355da1eb
SW		 342{
343 u32 namelen;
344 u32 numattr = 0;
345 void *p, *end;
346 u32 len;
347 const char *name, *val;
348 struct ceph_inode_info *ci = ceph_inode(inode);
349 int xattr_version;
350 struct ceph_inode_xattr **xattrs = NULL;
63ff78b2 351 int err = 0;
355da1eb
SW		 352 int i;
353
354 dout("__build_xattrs() len=%d\n",
355 ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0);
356
357 if (ci->i_xattrs.index_version >= ci->i_xattrs.version)
358 return 0; /* already built */
359
360 __ceph_destroy_xattrs(ci);
361
362start:
363 /* updated internal xattr rb tree */
364 if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) {
365 p = ci->i_xattrs.blob->vec.iov_base;
366 end = p + ci->i_xattrs.blob->vec.iov_len;
367 ceph_decode_32_safe(&p, end, numattr, bad);
368 xattr_version = ci->i_xattrs.version;
369 spin_unlock(&inode->i_lock);
370
371 xattrs = kcalloc(numattr, sizeof(struct ceph_xattr *),
372 GFP_NOFS);
373 err = -ENOMEM;
374 if (!xattrs)
375 goto bad_lock;
376 memset(xattrs, 0, numattr*sizeof(struct ceph_xattr *));
377 for (i = 0; i < numattr; i++) {
378 xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr),
379 GFP_NOFS);
380 if (!xattrs[i])
381 goto bad_lock;
382 }
383
384 spin_lock(&inode->i_lock);
385 if (ci->i_xattrs.version != xattr_version) {
386 /* lost a race, retry */
387 for (i = 0; i < numattr; i++)
388 kfree(xattrs[i]);
389 kfree(xattrs);
390 goto start;
391 }
392 err = -EIO;
393 while (numattr--) {
394 ceph_decode_32_safe(&p, end, len, bad);
395 namelen = len;
396 name = p;
397 p += len;
398 ceph_decode_32_safe(&p, end, len, bad);
399 val = p;
400 p += len;
401
402 err = __set_xattr(ci, name, namelen, val, len,
403 0, 0, 0, &xattrs[numattr]);
404
405 if (err < 0)
406 goto bad;
407 }
408 kfree(xattrs);
409 }
410 ci->i_xattrs.index_version = ci->i_xattrs.version;
411 ci->i_xattrs.dirty = false;
412
413 return err;
414bad_lock:
415 spin_lock(&inode->i_lock);
416bad:
417 if (xattrs) {
418 for (i = 0; i < numattr; i++)
419 kfree(xattrs[i]);
420 kfree(xattrs);
421 }
422 ci->i_xattrs.names_size = 0;
423 return err;
424}
425
426static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size,
427 int val_size)
428{
429 /*
430 * 4 bytes for the length, and additional 4 bytes per each xattr name,
431 * 4 bytes per each value
432 */
433 int size = 4 + ci->i_xattrs.count*(4 + 4) +
434 ci->i_xattrs.names_size +
435 ci->i_xattrs.vals_size;
436 dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n",
437 ci->i_xattrs.count, ci->i_xattrs.names_size,
438 ci->i_xattrs.vals_size);
439
440 if (name_size)
441 size += 4 + 4 + name_size + val_size;
442
443 return size;
444}
445
446/*
447 * If there are dirty xattrs, reencode xattrs into the prealloc_blob
448 * and swap into place.
449 */
450void __ceph_build_xattrs_blob(struct ceph_inode_info *ci)
451{
452 struct rb_node *p;
453 struct ceph_inode_xattr *xattr = NULL;
454 void *dest;
455
456 dout("__build_xattrs_blob %p\n", &ci->vfs_inode);
457 if (ci->i_xattrs.dirty) {
458 int need = __get_required_blob_size(ci, 0, 0);
459
460 BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len);
461
462 p = rb_first(&ci->i_xattrs.index);
463 dest = ci->i_xattrs.prealloc_blob->vec.iov_base;
464
465 ceph_encode_32(&dest, ci->i_xattrs.count);
466 while (p) {
467 xattr = rb_entry(p, struct ceph_inode_xattr, node);
468
469 ceph_encode_32(&dest, xattr->name_len);
470 memcpy(dest, xattr->name, xattr->name_len);
471 dest += xattr->name_len;
472 ceph_encode_32(&dest, xattr->val_len);
473 memcpy(dest, xattr->val, xattr->val_len);
474 dest += xattr->val_len;
475
476 p = rb_next(p);
477 }
478
479 /* adjust buffer len; it may be larger than we need */
480 ci->i_xattrs.prealloc_blob->vec.iov_len =
481 dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
482
b6c1d5b8
SW		 483 if (ci->i_xattrs.blob)
484 ceph_buffer_put(ci->i_xattrs.blob);
355da1eb
SW		 485 ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
486 ci->i_xattrs.prealloc_blob = NULL;
487 ci->i_xattrs.dirty = false;
4a625be4 488 ci->i_xattrs.version++;
355da1eb
SW		 489 }
490}
491
492ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
493 size_t size)
494{
495 struct inode *inode = dentry->d_inode;
496 struct ceph_inode_info *ci = ceph_inode(inode);
497 struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
498 int err;
499 struct ceph_inode_xattr *xattr;
500 struct ceph_vxattr_cb *vxattr = NULL;
501
502 if (!ceph_is_valid_xattr(name))
503 return -ENODATA;
504
505 /* let's see if a virtual xattr was requested */
506 if (vxattrs)
507 vxattr = ceph_match_vxattr(vxattrs, name);
508
509 spin_lock(&inode->i_lock);
510 dout("getxattr %p ver=%lld index_ver=%lld\n", inode,
511 ci->i_xattrs.version, ci->i_xattrs.index_version);
512
513 if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
514 (ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
515 goto get_xattr;
516 } else {
517 spin_unlock(&inode->i_lock);
518 /* get xattrs from mds (if we don't already have them) */
519 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
520 if (err)
521 return err;
522 }
523
524 spin_lock(&inode->i_lock);
525
526 if (vxattr && vxattr->readonly) {
527 err = vxattr->getxattr_cb(ci, value, size);
528 goto out;
529 }
530
531 err = __build_xattrs(inode);
532 if (err < 0)
533 goto out;
534
535get_xattr:
536 err = -ENODATA; /* == ENOATTR */
537 xattr = __get_xattr(ci, name);
538 if (!xattr) {
539 if (vxattr)
540 err = vxattr->getxattr_cb(ci, value, size);
541 goto out;
542 }
543
544 err = -ERANGE;
545 if (size && size < xattr->val_len)
546 goto out;
547
548 err = xattr->val_len;
549 if (size == 0)
550 goto out;
551
552 memcpy(value, xattr->val, xattr->val_len);
553
554out:
555 spin_unlock(&inode->i_lock);
556 return err;
557}
558
559ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
560{
561 struct inode *inode = dentry->d_inode;
562 struct ceph_inode_info *ci = ceph_inode(inode);
563 struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
564 u32 vir_namelen = 0;
565 u32 namelen;
566 int err;
567 u32 len;
568 int i;
569
570 spin_lock(&inode->i_lock);
571 dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
572 ci->i_xattrs.version, ci->i_xattrs.index_version);
573
574 if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
bddfa3cc 575 (ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
355da1eb
SW		 576 goto list_xattr;
577 } else {
578 spin_unlock(&inode->i_lock);
579 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
580 if (err)
581 return err;
582 }
583
584 spin_lock(&inode->i_lock);
585
586 err = __build_xattrs(inode);
587 if (err < 0)
588 goto out;
589
590list_xattr:
591 vir_namelen = 0;
592 /* include virtual dir xattrs */
593 if (vxattrs)
594 for (i = 0; vxattrs[i].name; i++)
595 vir_namelen += strlen(vxattrs[i].name) + 1;
596 /* adding 1 byte per each variable due to the null termination */
597 namelen = vir_namelen + ci->i_xattrs.names_size + ci->i_xattrs.count;
598 err = -ERANGE;
599 if (size && namelen > size)
600 goto out;
601
602 err = namelen;
603 if (size == 0)
604 goto out;
605
606 names = __copy_xattr_names(ci, names);
607
608 /* virtual xattr names, too */
609 if (vxattrs)
610 for (i = 0; vxattrs[i].name; i++) {
611 len = sprintf(names, "%s", vxattrs[i].name);
612 names += len + 1;
613 }
614
615out:
616 spin_unlock(&inode->i_lock);
617 return err;
618}
619
620static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
621 const char *value, size_t size, int flags)
622{
640ef79d 623 struct ceph_client *client = ceph_sb_to_client(dentry->d_sb);
355da1eb
SW		 624 struct inode *inode = dentry->d_inode;
625 struct ceph_inode_info *ci = ceph_inode(inode);
626 struct inode *parent_inode = dentry->d_parent->d_inode;
627 struct ceph_mds_request *req;
628 struct ceph_mds_client *mdsc = &client->mdsc;
629 int err;
630 int i, nr_pages;
631 struct page **pages = NULL;
632 void *kaddr;
633
634 /* copy value into some pages */
635 nr_pages = calc_pages_for(0, size);
636 if (nr_pages) {
637 pages = kmalloc(sizeof(pages[0])*nr_pages, GFP_NOFS);
638 if (!pages)
639 return -ENOMEM;
640 err = -ENOMEM;
641 for (i = 0; i < nr_pages; i++) {
31459fe4 642 pages[i] = __page_cache_alloc(GFP_NOFS);
355da1eb
SW		 643 if (!pages[i]) {
644 nr_pages = i;
645 goto out;
646 }
647 kaddr = kmap(pages[i]);
648 memcpy(kaddr, value + i*PAGE_CACHE_SIZE,
649 min(PAGE_CACHE_SIZE, size-i*PAGE_CACHE_SIZE));
650 }
651 }
652
653 dout("setxattr value=%.*s\n", (int)size, value);
654
655 /* do request */
656 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETXATTR,
657 USE_AUTH_MDS);
60d87733
JL		 658 if (IS_ERR(req)) {
659 err = PTR_ERR(req);
660 goto out;
661 }
355da1eb
SW		 662 req->r_inode = igrab(inode);
663 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
664 req->r_num_caps = 1;
665 req->r_args.setxattr.flags = cpu_to_le32(flags);
666 req->r_path2 = kstrdup(name, GFP_NOFS);
667
668 req->r_pages = pages;
669 req->r_num_pages = nr_pages;
670 req->r_data_len = size;
671
672 dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
673 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
674 ceph_mdsc_put_request(req);
675 dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
676
677out:
678 if (pages) {
679 for (i = 0; i < nr_pages; i++)
680 __free_page(pages[i]);
681 kfree(pages);
682 }
683 return err;
684}
685
686int ceph_setxattr(struct dentry *dentry, const char *name,
687 const void *value, size_t size, int flags)
688{
689 struct inode *inode = dentry->d_inode;
690 struct ceph_inode_info *ci = ceph_inode(inode);
691 struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
692 int err;
693 int name_len = strlen(name);
694 int val_len = size;
695 char *newname = NULL;
696 char *newval = NULL;
697 struct ceph_inode_xattr *xattr = NULL;
698 int issued;
699 int required_blob_size;
700
701 if (ceph_snap(inode) != CEPH_NOSNAP)
702 return -EROFS;
703
704 if (!ceph_is_valid_xattr(name))
705 return -EOPNOTSUPP;
706
707 if (vxattrs) {
708 struct ceph_vxattr_cb *vxattr =
709 ceph_match_vxattr(vxattrs, name);
710 if (vxattr && vxattr->readonly)
711 return -EOPNOTSUPP;
712 }
713
714 /* preallocate memory for xattr name, value, index node */
715 err = -ENOMEM;
716 newname = kmalloc(name_len + 1, GFP_NOFS);
717 if (!newname)
718 goto out;
719 memcpy(newname, name, name_len + 1);
720
721 if (val_len) {
722 newval = kmalloc(val_len + 1, GFP_NOFS);
723 if (!newval)
724 goto out;
725 memcpy(newval, value, val_len);
726 newval[val_len] = '\0';
727 }
728
729 xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS);
730 if (!xattr)
731 goto out;
732
733 spin_lock(&inode->i_lock);
734retry:
735 issued = __ceph_caps_issued(ci, NULL);
736 if (!(issued & CEPH_CAP_XATTR_EXCL))
737 goto do_sync;
738 __build_xattrs(inode);
739
740 required_blob_size = __get_required_blob_size(ci, name_len, val_len);
741
742 if (!ci->i_xattrs.prealloc_blob ||
743 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
744 struct ceph_buffer *blob = NULL;
745
746 spin_unlock(&inode->i_lock);
747 dout(" preaallocating new blob size=%d\n", required_blob_size);
b6c1d5b8 748 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
355da1eb
SW		 749 if (!blob)
750 goto out;
751 spin_lock(&inode->i_lock);
b6c1d5b8
SW		 752 if (ci->i_xattrs.prealloc_blob)
753 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
355da1eb
SW		 754 ci->i_xattrs.prealloc_blob = blob;
755 goto retry;
756 }
757
758 dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued));
759 err = __set_xattr(ci, newname, name_len, newval,
760 val_len, 1, 1, 1, &xattr);
761 __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
762 ci->i_xattrs.dirty = true;
763 inode->i_ctime = CURRENT_TIME;
764 spin_unlock(&inode->i_lock);
765
766 return err;
767
768do_sync:
769 spin_unlock(&inode->i_lock);
770 err = ceph_sync_setxattr(dentry, name, value, size, flags);
771out:
772 kfree(newname);
773 kfree(newval);
774 kfree(xattr);
775 return err;
776}
777
778static int ceph_send_removexattr(struct dentry *dentry, const char *name)
779{
640ef79d 780 struct ceph_client *client = ceph_sb_to_client(dentry->d_sb);
355da1eb
SW		 781 struct ceph_mds_client *mdsc = &client->mdsc;
782 struct inode *inode = dentry->d_inode;
783 struct inode *parent_inode = dentry->d_parent->d_inode;
784 struct ceph_mds_request *req;
785 int err;
786
787 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RMXATTR,
788 USE_AUTH_MDS);
789 if (IS_ERR(req))
790 return PTR_ERR(req);
791 req->r_inode = igrab(inode);
792 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
793 req->r_num_caps = 1;
794 req->r_path2 = kstrdup(name, GFP_NOFS);
795
796 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
797 ceph_mdsc_put_request(req);
798 return err;
799}
800
801int ceph_removexattr(struct dentry *dentry, const char *name)
802{
803 struct inode *inode = dentry->d_inode;
804 struct ceph_inode_info *ci = ceph_inode(inode);
805 struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
806 int issued;
807 int err;
808
809 if (ceph_snap(inode) != CEPH_NOSNAP)
810 return -EROFS;
811
812 if (!ceph_is_valid_xattr(name))
813 return -EOPNOTSUPP;
814
815 if (vxattrs) {
816 struct ceph_vxattr_cb *vxattr =
817 ceph_match_vxattr(vxattrs, name);
818 if (vxattr && vxattr->readonly)
819 return -EOPNOTSUPP;
820 }
821
822 spin_lock(&inode->i_lock);
823 __build_xattrs(inode);
824 issued = __ceph_caps_issued(ci, NULL);
825 dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued));
826
827 if (!(issued & CEPH_CAP_XATTR_EXCL))
828 goto do_sync;
829
830 err = __remove_xattr_by_name(ceph_inode(inode), name);
831 __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
832 ci->i_xattrs.dirty = true;
833 inode->i_ctime = CURRENT_TIME;
834
835 spin_unlock(&inode->i_lock);
836
837 return err;
838do_sync:
839 spin_unlock(&inode->i_lock);
840 err = ceph_send_removexattr(dentry, name);
841 return err;
842}
843
Clone of davem's net-next-2.6 tree