1#include <linux/ceph/ceph_debug.h>
2
3#include "super.h"
4#include "mds_client.h"
5
6#include <linux/ceph/decode.h>
7
8#include <linux/xattr.h>
9#include <linux/slab.h>
10
11static bool ceph_is_valid_xattr(const char *name)
12{
13 return !strncmp(name, "ceph.", 5) ||
14 !strncmp(name, XATTR_SECURITY_PREFIX,
15 XATTR_SECURITY_PREFIX_LEN) ||
16 !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) ||
17 !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
18}
19
20
21
22
23
24struct ceph_vxattr_cb {
25 bool readonly;
26 char *name;
27 size_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val,
28 size_t size);
29};
30
31
32
33static size_t ceph_vxattrcb_entries(struct ceph_inode_info *ci, char *val,
34 size_t size)
35{
36 return snprintf(val, size, "%lld", ci->i_files + ci->i_subdirs);
37}
38
39static size_t ceph_vxattrcb_files(struct ceph_inode_info *ci, char *val,
40 size_t size)
41{
42 return snprintf(val, size, "%lld", ci->i_files);
43}
44
45static size_t ceph_vxattrcb_subdirs(struct ceph_inode_info *ci, char *val,
46 size_t size)
47{
48 return snprintf(val, size, "%lld", ci->i_subdirs);
49}
50
51static size_t ceph_vxattrcb_rentries(struct ceph_inode_info *ci, char *val,
52 size_t size)
53{
54 return snprintf(val, size, "%lld", ci->i_rfiles + ci->i_rsubdirs);
55}
56
57static size_t ceph_vxattrcb_rfiles(struct ceph_inode_info *ci, char *val,
58 size_t size)
59{
60 return snprintf(val, size, "%lld", ci->i_rfiles);
61}
62
63static size_t ceph_vxattrcb_rsubdirs(struct ceph_inode_info *ci, char *val,
64 size_t size)
65{
66 return snprintf(val, size, "%lld", ci->i_rsubdirs);
67}
68
69static size_t ceph_vxattrcb_rbytes(struct ceph_inode_info *ci, char *val,
70 size_t size)
71{
72 return snprintf(val, size, "%lld", ci->i_rbytes);
73}
74
75static size_t ceph_vxattrcb_rctime(struct ceph_inode_info *ci, char *val,
76 size_t size)
77{
78 return snprintf(val, size, "%ld.%ld", (long)ci->i_rctime.tv_sec,
79 (long)ci->i_rctime.tv_nsec);
80}
81
82static struct ceph_vxattr_cb ceph_dir_vxattrs[] = {
83 { true, "ceph.dir.entries", ceph_vxattrcb_entries},
84 { true, "ceph.dir.files", ceph_vxattrcb_files},
85 { true, "ceph.dir.subdirs", ceph_vxattrcb_subdirs},
86 { true, "ceph.dir.rentries", ceph_vxattrcb_rentries},
87 { true, "ceph.dir.rfiles", ceph_vxattrcb_rfiles},
88 { true, "ceph.dir.rsubdirs", ceph_vxattrcb_rsubdirs},
89 { true, "ceph.dir.rbytes", ceph_vxattrcb_rbytes},
90 { true, "ceph.dir.rctime", ceph_vxattrcb_rctime},
91 { true, NULL, NULL }
92};
93
94
95
96static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
97 size_t size)
98{
99 int ret;
100
101 ret = snprintf(val, size,
102 "chunk_bytes=%lld\nstripe_count=%lld\nobject_size=%lld\n",
103 (unsigned long long)ceph_file_layout_su(ci->i_layout),
104 (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
105 (unsigned long long)ceph_file_layout_object_size(ci->i_layout));
106 if (ceph_file_layout_pg_preferred(ci->i_layout))
107 ret += snprintf(val + ret, size, "preferred_osd=%lld\n",
108 (unsigned long long)ceph_file_layout_pg_preferred(
109 ci->i_layout));
110 return ret;
111}
112
113static struct ceph_vxattr_cb ceph_file_vxattrs[] = {
114 { true, "ceph.layout", ceph_vxattrcb_layout},
115 { NULL, NULL }
116};
117
118static struct ceph_vxattr_cb *ceph_inode_vxattrs(struct inode *inode)
119{
120 if (S_ISDIR(inode->i_mode))
121 return ceph_dir_vxattrs;
122 else if (S_ISREG(inode->i_mode))
123 return ceph_file_vxattrs;
124 return NULL;
125}
126
127static struct ceph_vxattr_cb *ceph_match_vxattr(struct ceph_vxattr_cb *vxattr,
128 const char *name)
129{
130 do {
131 if (strcmp(vxattr->name, name) == 0)
132 return vxattr;
133 vxattr++;
134 } while (vxattr->name);
135 return NULL;
136}
137
138static int __set_xattr(struct ceph_inode_info *ci,
139 const char *name, int name_len,
140 const char *val, int val_len,
141 int dirty,
142 int should_free_name, int should_free_val,
143 struct ceph_inode_xattr **newxattr)
144{
145 struct rb_node **p;
146 struct rb_node *parent = NULL;
147 struct ceph_inode_xattr *xattr = NULL;
148 int c;
149 int new = 0;
150
151 p = &ci->i_xattrs.index.rb_node;
152 while (*p) {
153 parent = *p;
154 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
155 c = strncmp(name, xattr->name, min(name_len, xattr->name_len));
156 if (c < 0)
157 p = &(*p)->rb_left;
158 else if (c > 0)
159 p = &(*p)->rb_right;
160 else {
161 if (name_len == xattr->name_len)
162 break;
163 else if (name_len < xattr->name_len)
164 p = &(*p)->rb_left;
165 else
166 p = &(*p)->rb_right;
167 }
168 xattr = NULL;
169 }
170
171 if (!xattr) {
172 new = 1;
173 xattr = *newxattr;
174 xattr->name = name;
175 xattr->name_len = name_len;
176 xattr->should_free_name = should_free_name;
177
178 ci->i_xattrs.count++;
179 dout("__set_xattr count=%d\n", ci->i_xattrs.count);
180 } else {
181 kfree(*newxattr);
182 *newxattr = NULL;
183 if (xattr->should_free_val)
184 kfree((void *)xattr->val);
185
186 if (should_free_name) {
187 kfree((void *)name);
188 name = xattr->name;
189 }
190 ci->i_xattrs.names_size -= xattr->name_len;
191 ci->i_xattrs.vals_size -= xattr->val_len;
192 }
193 ci->i_xattrs.names_size += name_len;
194 ci->i_xattrs.vals_size += val_len;
195 if (val)
196 xattr->val = val;
197 else
198 xattr->val = "";
199
200 xattr->val_len = val_len;
201 xattr->dirty = dirty;
202 xattr->should_free_val = (val && should_free_val);
203
204 if (new) {
205 rb_link_node(&xattr->node, parent, p);
206 rb_insert_color(&xattr->node, &ci->i_xattrs.index);
207 dout("__set_xattr_val p=%p\n", p);
208 }
209
210 dout("__set_xattr_val added %llx.%llx xattr %p %s=%.*s\n",
211 ceph_vinop(&ci->vfs_inode), xattr, name, val_len, val);
212
213 return 0;
214}
215
216static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci,
217 const char *name)
218{
219 struct rb_node **p;
220 struct rb_node *parent = NULL;
221 struct ceph_inode_xattr *xattr = NULL;
222 int name_len = strlen(name);
223 int c;
224
225 p = &ci->i_xattrs.index.rb_node;
226 while (*p) {
227 parent = *p;
228 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
229 c = strncmp(name, xattr->name, xattr->name_len);
230 if (c == 0 && name_len > xattr->name_len)
231 c = 1;
232 if (c < 0)
233 p = &(*p)->rb_left;
234 else if (c > 0)
235 p = &(*p)->rb_right;
236 else {
237 dout("__get_xattr %s: found %.*s\n", name,
238 xattr->val_len, xattr->val);
239 return xattr;
240 }
241 }
242
243 dout("__get_xattr %s: not found\n", name);
244
245 return NULL;
246}
247
248static void __free_xattr(struct ceph_inode_xattr *xattr)
249{
250 BUG_ON(!xattr);
251
252 if (xattr->should_free_name)
253 kfree((void *)xattr->name);
254 if (xattr->should_free_val)
255 kfree((void *)xattr->val);
256
257 kfree(xattr);
258}
259
260static int __remove_xattr(struct ceph_inode_info *ci,
261 struct ceph_inode_xattr *xattr)
262{
263 if (!xattr)
264 return -EOPNOTSUPP;
265
266 rb_erase(&xattr->node, &ci->i_xattrs.index);
267
268 if (xattr->should_free_name)
269 kfree((void *)xattr->name);
270 if (xattr->should_free_val)
271 kfree((void *)xattr->val);
272
273 ci->i_xattrs.names_size -= xattr->name_len;
274 ci->i_xattrs.vals_size -= xattr->val_len;
275 ci->i_xattrs.count--;
276 kfree(xattr);
277
278 return 0;
279}
280
281static int __remove_xattr_by_name(struct ceph_inode_info *ci,
282 const char *name)
283{
284 struct rb_node **p;
285 struct ceph_inode_xattr *xattr;
286 int err;
287
288 p = &ci->i_xattrs.index.rb_node;
289 xattr = __get_xattr(ci, name);
290 err = __remove_xattr(ci, xattr);
291 return err;
292}
293
294static char *__copy_xattr_names(struct ceph_inode_info *ci,
295 char *dest)
296{
297 struct rb_node *p;
298 struct ceph_inode_xattr *xattr = NULL;
299
300 p = rb_first(&ci->i_xattrs.index);
301 dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count);
302
303 while (p) {
304 xattr = rb_entry(p, struct ceph_inode_xattr, node);
305 memcpy(dest, xattr->name, xattr->name_len);
306 dest[xattr->name_len] = '\0';
307
308 dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name,
309 xattr->name_len, ci->i_xattrs.names_size);
310
311 dest += xattr->name_len + 1;
312 p = rb_next(p);
313 }
314
315 return dest;
316}
317
318void __ceph_destroy_xattrs(struct ceph_inode_info *ci)
319{
320 struct rb_node *p, *tmp;
321 struct ceph_inode_xattr *xattr = NULL;
322
323 p = rb_first(&ci->i_xattrs.index);
324
325 dout("__ceph_destroy_xattrs p=%p\n", p);
326
327 while (p) {
328 xattr = rb_entry(p, struct ceph_inode_xattr, node);
329 tmp = p;
330 p = rb_next(tmp);
331 dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p,
332 xattr->name_len, xattr->name);
333 rb_erase(tmp, &ci->i_xattrs.index);
334
335 __free_xattr(xattr);
336 }
337
338 ci->i_xattrs.names_size = 0;
339 ci->i_xattrs.vals_size = 0;
340 ci->i_xattrs.index_version = 0;
341 ci->i_xattrs.count = 0;
342 ci->i_xattrs.index = RB_ROOT;
343}
344
345static int __build_xattrs(struct inode *inode)
346 __releases(inode->i_lock)
347 __acquires(inode->i_lock)
348{
349 u32 namelen;
350 u32 numattr = 0;
351 void *p, *end;
352 u32 len;
353 const char *name, *val;
354 struct ceph_inode_info *ci = ceph_inode(inode);
355 int xattr_version;
356 struct ceph_inode_xattr **xattrs = NULL;
357 int err = 0;
358 int i;
359
360 dout("__build_xattrs() len=%d\n",
361 ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0);
362
363 if (ci->i_xattrs.index_version >= ci->i_xattrs.version)
364 return 0;
365
366 __ceph_destroy_xattrs(ci);
367
368start:
369
370 if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) {
371 p = ci->i_xattrs.blob->vec.iov_base;
372 end = p + ci->i_xattrs.blob->vec.iov_len;
373 ceph_decode_32_safe(&p, end, numattr, bad);
374 xattr_version = ci->i_xattrs.version;
375 spin_unlock(&inode->i_lock);
376
377 xattrs = kcalloc(numattr, sizeof(struct ceph_xattr *),
378 GFP_NOFS);
379 err = -ENOMEM;
380 if (!xattrs)
381 goto bad_lock;
382 memset(xattrs, 0, numattr*sizeof(struct ceph_xattr *));
383 for (i = 0; i < numattr; i++) {
384 xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr),
385 GFP_NOFS);
386 if (!xattrs[i])
387 goto bad_lock;
388 }
389
390 spin_lock(&inode->i_lock);
391 if (ci->i_xattrs.version != xattr_version) {
392
393 for (i = 0; i < numattr; i++)
394 kfree(xattrs[i]);
395 kfree(xattrs);
396 goto start;
397 }
398 err = -EIO;
399 while (numattr--) {
400 ceph_decode_32_safe(&p, end, len, bad);
401 namelen = len;
402 name = p;
403 p += len;
404 ceph_decode_32_safe(&p, end, len, bad);
405 val = p;
406 p += len;
407
408 err = __set_xattr(ci, name, namelen, val, len,
409 0, 0, 0, &xattrs[numattr]);
410
411 if (err < 0)
412 goto bad;
413 }
414 kfree(xattrs);
415 }
416 ci->i_xattrs.index_version = ci->i_xattrs.version;
417 ci->i_xattrs.dirty = false;
418
419 return err;
420bad_lock:
421 spin_lock(&inode->i_lock);
422bad:
423 if (xattrs) {
424 for (i = 0; i < numattr; i++)
425 kfree(xattrs[i]);
426 kfree(xattrs);
427 }
428 ci->i_xattrs.names_size = 0;
429 return err;
430}
431
432static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size,
433 int val_size)
434{
435
436
437
438
439 int size = 4 + ci->i_xattrs.count*(4 + 4) +
440 ci->i_xattrs.names_size +
441 ci->i_xattrs.vals_size;
442 dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n",
443 ci->i_xattrs.count, ci->i_xattrs.names_size,
444 ci->i_xattrs.vals_size);
445
446 if (name_size)
447 size += 4 + 4 + name_size + val_size;
448
449 return size;
450}
451
452
453
454
455
456void __ceph_build_xattrs_blob(struct ceph_inode_info *ci)
457{
458 struct rb_node *p;
459 struct ceph_inode_xattr *xattr = NULL;
460 void *dest;
461
462 dout("__build_xattrs_blob %p\n", &ci->vfs_inode);
463 if (ci->i_xattrs.dirty) {
464 int need = __get_required_blob_size(ci, 0, 0);
465
466 BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len);
467
468 p = rb_first(&ci->i_xattrs.index);
469 dest = ci->i_xattrs.prealloc_blob->vec.iov_base;
470
471 ceph_encode_32(&dest, ci->i_xattrs.count);
472 while (p) {
473 xattr = rb_entry(p, struct ceph_inode_xattr, node);
474
475 ceph_encode_32(&dest, xattr->name_len);
476 memcpy(dest, xattr->name, xattr->name_len);
477 dest += xattr->name_len;
478 ceph_encode_32(&dest, xattr->val_len);
479 memcpy(dest, xattr->val, xattr->val_len);
480 dest += xattr->val_len;
481
482 p = rb_next(p);
483 }
484
485
486 ci->i_xattrs.prealloc_blob->vec.iov_len =
487 dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
488
489 if (ci->i_xattrs.blob)
490 ceph_buffer_put(ci->i_xattrs.blob);
491 ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
492 ci->i_xattrs.prealloc_blob = NULL;
493 ci->i_xattrs.dirty = false;
494 ci->i_xattrs.version++;
495 }
496}
497
498ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
499 size_t size)
500{
501 struct inode *inode = dentry->d_inode;
502 struct ceph_inode_info *ci = ceph_inode(inode);
503 struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
504 int err;
505 struct ceph_inode_xattr *xattr;
506 struct ceph_vxattr_cb *vxattr = NULL;
507
508 if (!ceph_is_valid_xattr(name))
509 return -ENODATA;
510
511
512 if (vxattrs)
513 vxattr = ceph_match_vxattr(vxattrs, name);
514
515 spin_lock(&inode->i_lock);
516 dout("getxattr %p ver=%lld index_ver=%lld\n", inode,
517 ci->i_xattrs.version, ci->i_xattrs.index_version);
518
519 if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
520 (ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
521 goto get_xattr;
522 } else {
523 spin_unlock(&inode->i_lock);
524
525 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
526 if (err)
527 return err;
528 }
529
530 spin_lock(&inode->i_lock);
531
532 if (vxattr && vxattr->readonly) {
533 err = vxattr->getxattr_cb(ci, value, size);
534 goto out;
535 }
536
537 err = __build_xattrs(inode);
538 if (err < 0)
539 goto out;
540
541get_xattr:
542 err = -ENODATA;
543 xattr = __get_xattr(ci, name);
544 if (!xattr) {
545 if (vxattr)
546 err = vxattr->getxattr_cb(ci, value, size);
547 goto out;
548 }
549
550 err = -ERANGE;
551 if (size && size < xattr->val_len)
552 goto out;
553
554 err = xattr->val_len;
555 if (size == 0)
556 goto out;
557
558 memcpy(value, xattr->val, xattr->val_len);
559
560out:
561 spin_unlock(&inode->i_lock);
562 return err;
563}
564
565ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
566{
567 struct inode *inode = dentry->d_inode;
568 struct ceph_inode_info *ci = ceph_inode(inode);
569 struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
570 u32 vir_namelen = 0;
571 u32 namelen;
572 int err;
573 u32 len;
574 int i;
575
576 spin_lock(&inode->i_lock);
577 dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
578 ci->i_xattrs.version, ci->i_xattrs.index_version);
579
580 if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
581 (ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
582 goto list_xattr;
583 } else {
584 spin_unlock(&inode->i_lock);
585 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
586 if (err)
587 return err;
588 }
589
590 spin_lock(&inode->i_lock);
591
592 err = __build_xattrs(inode);
593 if (err < 0)
594 goto out;
595
596list_xattr:
597 vir_namelen = 0;
598
599 if (vxattrs)
600 for (i = 0; vxattrs[i].name; i++)
601 vir_namelen += strlen(vxattrs[i].name) + 1;
602
603 namelen = vir_namelen + ci->i_xattrs.names_size + ci->i_xattrs.count;
604 err = -ERANGE;
605 if (size && namelen > size)
606 goto out;
607
608 err = namelen;
609 if (size == 0)
610 goto out;
611
612 names = __copy_xattr_names(ci, names);
613
614
615 if (vxattrs)
616 for (i = 0; vxattrs[i].name; i++) {
617 len = sprintf(names, "%s", vxattrs[i].name);
618 names += len + 1;
619 }
620
621out:
622 spin_unlock(&inode->i_lock);
623 return err;
624}
625
626static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
627 const char *value, size_t size, int flags)
628{
629 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
630 struct inode *inode = dentry->d_inode;
631 struct ceph_inode_info *ci = ceph_inode(inode);
632 struct inode *parent_inode;
633 struct ceph_mds_request *req;
634 struct ceph_mds_client *mdsc = fsc->mdsc;
635 int err;
636 int i, nr_pages;
637 struct page **pages = NULL;
638 void *kaddr;
639
640
641 nr_pages = calc_pages_for(0, size);
642 if (nr_pages) {
643 pages = kmalloc(sizeof(pages[0])*nr_pages, GFP_NOFS);
644 if (!pages)
645 return -ENOMEM;
646 err = -ENOMEM;
647 for (i = 0; i < nr_pages; i++) {
648 pages[i] = __page_cache_alloc(GFP_NOFS);
649 if (!pages[i]) {
650 nr_pages = i;
651 goto out;
652 }
653 kaddr = kmap(pages[i]);
654 memcpy(kaddr, value + i*PAGE_CACHE_SIZE,
655 min(PAGE_CACHE_SIZE, size-i*PAGE_CACHE_SIZE));
656 }
657 }
658
659 dout("setxattr value=%.*s\n", (int)size, value);
660
661
662 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETXATTR,
663 USE_AUTH_MDS);
664 if (IS_ERR(req)) {
665 err = PTR_ERR(req);
666 goto out;
667 }
668 req->r_inode = inode;
669 ihold(inode);
670 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
671 req->r_num_caps = 1;
672 req->r_args.setxattr.flags = cpu_to_le32(flags);
673 req->r_path2 = kstrdup(name, GFP_NOFS);
674
675 req->r_pages = pages;
676 req->r_num_pages = nr_pages;
677 req->r_data_len = size;
678
679 dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
680 parent_inode = ceph_get_dentry_parent_inode(dentry);
681 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
682 iput(parent_inode);
683 ceph_mdsc_put_request(req);
684 dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
685
686out:
687 if (pages) {
688 for (i = 0; i < nr_pages; i++)
689 __free_page(pages[i]);
690 kfree(pages);
691 }
692 return err;
693}
694
695int ceph_setxattr(struct dentry *dentry, const char *name,
696 const void *value, size_t size, int flags)
697{
698 struct inode *inode = dentry->d_inode;
699 struct ceph_inode_info *ci = ceph_inode(inode);
700 struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
701 int err;
702 int name_len = strlen(name);
703 int val_len = size;
704 char *newname = NULL;
705 char *newval = NULL;
706 struct ceph_inode_xattr *xattr = NULL;
707 int issued;
708 int required_blob_size;
709 int dirty;
710
711 if (ceph_snap(inode) != CEPH_NOSNAP)
712 return -EROFS;
713
714 if (!ceph_is_valid_xattr(name))
715 return -EOPNOTSUPP;
716
717 if (vxattrs) {
718 struct ceph_vxattr_cb *vxattr =
719 ceph_match_vxattr(vxattrs, name);
720 if (vxattr && vxattr->readonly)
721 return -EOPNOTSUPP;
722 }
723
724
725 err = -ENOMEM;
726 newname = kmemdup(name, name_len + 1, GFP_NOFS);
727 if (!newname)
728 goto out;
729
730 if (val_len) {
731 newval = kmalloc(val_len + 1, GFP_NOFS);
732 if (!newval)
733 goto out;
734 memcpy(newval, value, val_len);
735 newval[val_len] = '\0';
736 }
737
738 xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS);
739 if (!xattr)
740 goto out;
741
742 spin_lock(&inode->i_lock);
743retry:
744 issued = __ceph_caps_issued(ci, NULL);
745 if (!(issued & CEPH_CAP_XATTR_EXCL))
746 goto do_sync;
747 __build_xattrs(inode);
748
749 required_blob_size = __get_required_blob_size(ci, name_len, val_len);
750
751 if (!ci->i_xattrs.prealloc_blob ||
752 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
753 struct ceph_buffer *blob = NULL;
754
755 spin_unlock(&inode->i_lock);
756 dout(" preaallocating new blob size=%d\n", required_blob_size);
757 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
758 if (!blob)
759 goto out;
760 spin_lock(&inode->i_lock);
761 if (ci->i_xattrs.prealloc_blob)
762 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
763 ci->i_xattrs.prealloc_blob = blob;
764 goto retry;
765 }
766
767 dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued));
768 err = __set_xattr(ci, newname, name_len, newval,
769 val_len, 1, 1, 1, &xattr);
770 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
771 ci->i_xattrs.dirty = true;
772 inode->i_ctime = CURRENT_TIME;
773 spin_unlock(&inode->i_lock);
774 if (dirty)
775 __mark_inode_dirty(inode, dirty);
776 return err;
777
778do_sync:
779 spin_unlock(&inode->i_lock);
780 err = ceph_sync_setxattr(dentry, name, value, size, flags);
781out:
782 kfree(newname);
783 kfree(newval);
784 kfree(xattr);
785 return err;
786}
787
788static int ceph_send_removexattr(struct dentry *dentry, const char *name)
789{
790 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
791 struct ceph_mds_client *mdsc = fsc->mdsc;
792 struct inode *inode = dentry->d_inode;
793 struct inode *parent_inode;
794 struct ceph_mds_request *req;
795 int err;
796
797 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RMXATTR,
798 USE_AUTH_MDS);
799 if (IS_ERR(req))
800 return PTR_ERR(req);
801 req->r_inode = inode;
802 ihold(inode);
803 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
804 req->r_num_caps = 1;
805 req->r_path2 = kstrdup(name, GFP_NOFS);
806
807 parent_inode = ceph_get_dentry_parent_inode(dentry);
808 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
809 iput(parent_inode);
810 ceph_mdsc_put_request(req);
811 return err;
812}
813
814int ceph_removexattr(struct dentry *dentry, const char *name)
815{
816 struct inode *inode = dentry->d_inode;
817 struct ceph_inode_info *ci = ceph_inode(inode);
818 struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
819 int issued;
820 int err;
821 int dirty;
822
823 if (ceph_snap(inode) != CEPH_NOSNAP)
824 return -EROFS;
825
826 if (!ceph_is_valid_xattr(name))
827 return -EOPNOTSUPP;
828
829 if (vxattrs) {
830 struct ceph_vxattr_cb *vxattr =
831 ceph_match_vxattr(vxattrs, name);
832 if (vxattr && vxattr->readonly)
833 return -EOPNOTSUPP;
834 }
835
836 spin_lock(&inode->i_lock);
837 __build_xattrs(inode);
838 issued = __ceph_caps_issued(ci, NULL);
839 dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued));
840
841 if (!(issued & CEPH_CAP_XATTR_EXCL))
842 goto do_sync;
843
844 err = __remove_xattr_by_name(ceph_inode(inode), name);
845 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
846 ci->i_xattrs.dirty = true;
847 inode->i_ctime = CURRENT_TIME;
848
849 spin_unlock(&inode->i_lock);
850 if (dirty)
851 __mark_inode_dirty(inode, dirty);
852 return err;
853do_sync:
854 spin_unlock(&inode->i_lock);
855 err = ceph_send_removexattr(dentry, name);
856 return err;
857}
858
859
