1#include <linux/ceph/ceph_debug.h>
2#include <linux/ceph/pagelist.h>
3
4#include "super.h"
5#include "mds_client.h"
6
7#include <linux/ceph/decode.h>
8
9#include <linux/xattr.h>
10#include <linux/posix_acl_xattr.h>
11#include <linux/slab.h>
12
13#define XATTR_CEPH_PREFIX "ceph."
14#define XATTR_CEPH_PREFIX_LEN (sizeof (XATTR_CEPH_PREFIX) - 1)
15
16static int __remove_xattr(struct ceph_inode_info *ci,
17 struct ceph_inode_xattr *xattr);
18
19
20
21
22
23const struct xattr_handler *ceph_xattr_handlers[] = {
24#ifdef CONFIG_CEPH_FS_POSIX_ACL
25 &posix_acl_access_xattr_handler,
26 &posix_acl_default_xattr_handler,
27#endif
28 NULL,
29};
30
31static bool ceph_is_valid_xattr(const char *name)
32{
33 return !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) ||
34 !strncmp(name, XATTR_SECURITY_PREFIX,
35 XATTR_SECURITY_PREFIX_LEN) ||
36 !strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) ||
37 !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) ||
38 !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
39}
40
41
42
43
44
45struct ceph_vxattr {
46 char *name;
47 size_t name_size;
48 size_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val,
49 size_t size);
50 bool readonly, hidden;
51 bool (*exists_cb)(struct ceph_inode_info *ci);
52};
53
54
55
56static bool ceph_vxattrcb_layout_exists(struct ceph_inode_info *ci)
57{
58 size_t s;
59 char *p = (char *)&ci->i_layout;
60
61 for (s = 0; s < sizeof(ci->i_layout); s++, p++)
62 if (*p)
63 return true;
64 return false;
65}
66
67static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
68 size_t size)
69{
70 int ret;
71 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
72 struct ceph_osd_client *osdc = &fsc->client->osdc;
73 s64 pool = ceph_file_layout_pg_pool(ci->i_layout);
74 const char *pool_name;
75 char buf[128];
76
77 dout("ceph_vxattrcb_layout %p\n", &ci->vfs_inode);
78 down_read(&osdc->map_sem);
79 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
80 if (pool_name) {
81 size_t len = strlen(pool_name);
82 ret = snprintf(buf, sizeof(buf),
83 "stripe_unit=%lld stripe_count=%lld object_size=%lld pool=",
84 (unsigned long long)ceph_file_layout_su(ci->i_layout),
85 (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
86 (unsigned long long)ceph_file_layout_object_size(ci->i_layout));
87 if (!size) {
88 ret += len;
89 } else if (ret + len > size) {
90 ret = -ERANGE;
91 } else {
92 memcpy(val, buf, ret);
93 memcpy(val + ret, pool_name, len);
94 ret += len;
95 }
96 } else {
97 ret = snprintf(buf, sizeof(buf),
98 "stripe_unit=%lld stripe_count=%lld object_size=%lld pool=%lld",
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),
102 (unsigned long long)pool);
103 if (size) {
104 if (ret <= size)
105 memcpy(val, buf, ret);
106 else
107 ret = -ERANGE;
108 }
109 }
110 up_read(&osdc->map_sem);
111 return ret;
112}
113
114static size_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci,
115 char *val, size_t size)
116{
117 return snprintf(val, size, "%lld",
118 (unsigned long long)ceph_file_layout_su(ci->i_layout));
119}
120
121static size_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci,
122 char *val, size_t size)
123{
124 return snprintf(val, size, "%lld",
125 (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout));
126}
127
128static size_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci,
129 char *val, size_t size)
130{
131 return snprintf(val, size, "%lld",
132 (unsigned long long)ceph_file_layout_object_size(ci->i_layout));
133}
134
135static size_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci,
136 char *val, size_t size)
137{
138 int ret;
139 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
140 struct ceph_osd_client *osdc = &fsc->client->osdc;
141 s64 pool = ceph_file_layout_pg_pool(ci->i_layout);
142 const char *pool_name;
143
144 down_read(&osdc->map_sem);
145 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
146 if (pool_name)
147 ret = snprintf(val, size, "%s", pool_name);
148 else
149 ret = snprintf(val, size, "%lld", (unsigned long long)pool);
150 up_read(&osdc->map_sem);
151 return ret;
152}
153
154
155
156static size_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val,
157 size_t size)
158{
159 return snprintf(val, size, "%lld", ci->i_files + ci->i_subdirs);
160}
161
162static size_t ceph_vxattrcb_dir_files(struct ceph_inode_info *ci, char *val,
163 size_t size)
164{
165 return snprintf(val, size, "%lld", ci->i_files);
166}
167
168static size_t ceph_vxattrcb_dir_subdirs(struct ceph_inode_info *ci, char *val,
169 size_t size)
170{
171 return snprintf(val, size, "%lld", ci->i_subdirs);
172}
173
174static size_t ceph_vxattrcb_dir_rentries(struct ceph_inode_info *ci, char *val,
175 size_t size)
176{
177 return snprintf(val, size, "%lld", ci->i_rfiles + ci->i_rsubdirs);
178}
179
180static size_t ceph_vxattrcb_dir_rfiles(struct ceph_inode_info *ci, char *val,
181 size_t size)
182{
183 return snprintf(val, size, "%lld", ci->i_rfiles);
184}
185
186static size_t ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info *ci, char *val,
187 size_t size)
188{
189 return snprintf(val, size, "%lld", ci->i_rsubdirs);
190}
191
192static size_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val,
193 size_t size)
194{
195 return snprintf(val, size, "%lld", ci->i_rbytes);
196}
197
198static size_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val,
199 size_t size)
200{
201 return snprintf(val, size, "%ld.09%ld", (long)ci->i_rctime.tv_sec,
202 (long)ci->i_rctime.tv_nsec);
203}
204
205
206#define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name
207#define CEPH_XATTR_NAME2(_type, _name, _name2) \
208 XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
209
210#define XATTR_NAME_CEPH(_type, _name) \
211 { \
212 .name = CEPH_XATTR_NAME(_type, _name), \
213 .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \
214 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
215 .readonly = true, \
216 .hidden = false, \
217 .exists_cb = NULL, \
218 }
219#define XATTR_LAYOUT_FIELD(_type, _name, _field) \
220 { \
221 .name = CEPH_XATTR_NAME2(_type, _name, _field), \
222 .name_size = sizeof (CEPH_XATTR_NAME2(_type, _name, _field)), \
223 .getxattr_cb = ceph_vxattrcb_ ## _name ## _ ## _field, \
224 .readonly = false, \
225 .hidden = true, \
226 .exists_cb = ceph_vxattrcb_layout_exists, \
227 }
228
229static struct ceph_vxattr ceph_dir_vxattrs[] = {
230 {
231 .name = "ceph.dir.layout",
232 .name_size = sizeof("ceph.dir.layout"),
233 .getxattr_cb = ceph_vxattrcb_layout,
234 .readonly = false,
235 .hidden = true,
236 .exists_cb = ceph_vxattrcb_layout_exists,
237 },
238 XATTR_LAYOUT_FIELD(dir, layout, stripe_unit),
239 XATTR_LAYOUT_FIELD(dir, layout, stripe_count),
240 XATTR_LAYOUT_FIELD(dir, layout, object_size),
241 XATTR_LAYOUT_FIELD(dir, layout, pool),
242 XATTR_NAME_CEPH(dir, entries),
243 XATTR_NAME_CEPH(dir, files),
244 XATTR_NAME_CEPH(dir, subdirs),
245 XATTR_NAME_CEPH(dir, rentries),
246 XATTR_NAME_CEPH(dir, rfiles),
247 XATTR_NAME_CEPH(dir, rsubdirs),
248 XATTR_NAME_CEPH(dir, rbytes),
249 XATTR_NAME_CEPH(dir, rctime),
250 { .name = NULL, 0 }
251};
252static size_t ceph_dir_vxattrs_name_size;
253
254
255
256static struct ceph_vxattr ceph_file_vxattrs[] = {
257 {
258 .name = "ceph.file.layout",
259 .name_size = sizeof("ceph.file.layout"),
260 .getxattr_cb = ceph_vxattrcb_layout,
261 .readonly = false,
262 .hidden = true,
263 .exists_cb = ceph_vxattrcb_layout_exists,
264 },
265 XATTR_LAYOUT_FIELD(file, layout, stripe_unit),
266 XATTR_LAYOUT_FIELD(file, layout, stripe_count),
267 XATTR_LAYOUT_FIELD(file, layout, object_size),
268 XATTR_LAYOUT_FIELD(file, layout, pool),
269 { .name = NULL, 0 }
270};
271static size_t ceph_file_vxattrs_name_size;
272
273static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode)
274{
275 if (S_ISDIR(inode->i_mode))
276 return ceph_dir_vxattrs;
277 else if (S_ISREG(inode->i_mode))
278 return ceph_file_vxattrs;
279 return NULL;
280}
281
282static size_t ceph_vxattrs_name_size(struct ceph_vxattr *vxattrs)
283{
284 if (vxattrs == ceph_dir_vxattrs)
285 return ceph_dir_vxattrs_name_size;
286 if (vxattrs == ceph_file_vxattrs)
287 return ceph_file_vxattrs_name_size;
288 BUG_ON(vxattrs);
289 return 0;
290}
291
292
293
294
295
296static size_t __init vxattrs_name_size(struct ceph_vxattr *vxattrs)
297{
298 struct ceph_vxattr *vxattr;
299 size_t size = 0;
300
301 for (vxattr = vxattrs; vxattr->name; vxattr++)
302 if (!vxattr->hidden)
303 size += vxattr->name_size;
304
305 return size;
306}
307
308
309
310void __init ceph_xattr_init(void)
311{
312 ceph_dir_vxattrs_name_size = vxattrs_name_size(ceph_dir_vxattrs);
313 ceph_file_vxattrs_name_size = vxattrs_name_size(ceph_file_vxattrs);
314}
315
316void ceph_xattr_exit(void)
317{
318 ceph_dir_vxattrs_name_size = 0;
319 ceph_file_vxattrs_name_size = 0;
320}
321
322static struct ceph_vxattr *ceph_match_vxattr(struct inode *inode,
323 const char *name)
324{
325 struct ceph_vxattr *vxattr = ceph_inode_vxattrs(inode);
326
327 if (vxattr) {
328 while (vxattr->name) {
329 if (!strcmp(vxattr->name, name))
330 return vxattr;
331 vxattr++;
332 }
333 }
334
335 return NULL;
336}
337
338static int __set_xattr(struct ceph_inode_info *ci,
339 const char *name, int name_len,
340 const char *val, int val_len,
341 int flags, int update_xattr,
342 struct ceph_inode_xattr **newxattr)
343{
344 struct rb_node **p;
345 struct rb_node *parent = NULL;
346 struct ceph_inode_xattr *xattr = NULL;
347 int c;
348 int new = 0;
349
350 p = &ci->i_xattrs.index.rb_node;
351 while (*p) {
352 parent = *p;
353 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
354 c = strncmp(name, xattr->name, min(name_len, xattr->name_len));
355 if (c < 0)
356 p = &(*p)->rb_left;
357 else if (c > 0)
358 p = &(*p)->rb_right;
359 else {
360 if (name_len == xattr->name_len)
361 break;
362 else if (name_len < xattr->name_len)
363 p = &(*p)->rb_left;
364 else
365 p = &(*p)->rb_right;
366 }
367 xattr = NULL;
368 }
369
370 if (update_xattr) {
371 int err = 0;
372 if (xattr && (flags & XATTR_CREATE))
373 err = -EEXIST;
374 else if (!xattr && (flags & XATTR_REPLACE))
375 err = -ENODATA;
376 if (err) {
377 kfree(name);
378 kfree(val);
379 return err;
380 }
381 if (update_xattr < 0) {
382 if (xattr)
383 __remove_xattr(ci, xattr);
384 kfree(name);
385 return 0;
386 }
387 }
388
389 if (!xattr) {
390 new = 1;
391 xattr = *newxattr;
392 xattr->name = name;
393 xattr->name_len = name_len;
394 xattr->should_free_name = update_xattr;
395
396 ci->i_xattrs.count++;
397 dout("__set_xattr count=%d\n", ci->i_xattrs.count);
398 } else {
399 kfree(*newxattr);
400 *newxattr = NULL;
401 if (xattr->should_free_val)
402 kfree((void *)xattr->val);
403
404 if (update_xattr) {
405 kfree((void *)name);
406 name = xattr->name;
407 }
408 ci->i_xattrs.names_size -= xattr->name_len;
409 ci->i_xattrs.vals_size -= xattr->val_len;
410 }
411 ci->i_xattrs.names_size += name_len;
412 ci->i_xattrs.vals_size += val_len;
413 if (val)
414 xattr->val = val;
415 else
416 xattr->val = "";
417
418 xattr->val_len = val_len;
419 xattr->dirty = update_xattr;
420 xattr->should_free_val = (val && update_xattr);
421
422 if (new) {
423 rb_link_node(&xattr->node, parent, p);
424 rb_insert_color(&xattr->node, &ci->i_xattrs.index);
425 dout("__set_xattr_val p=%p\n", p);
426 }
427
428 dout("__set_xattr_val added %llx.%llx xattr %p %s=%.*s\n",
429 ceph_vinop(&ci->vfs_inode), xattr, name, val_len, val);
430
431 return 0;
432}
433
434static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci,
435 const char *name)
436{
437 struct rb_node **p;
438 struct rb_node *parent = NULL;
439 struct ceph_inode_xattr *xattr = NULL;
440 int name_len = strlen(name);
441 int c;
442
443 p = &ci->i_xattrs.index.rb_node;
444 while (*p) {
445 parent = *p;
446 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
447 c = strncmp(name, xattr->name, xattr->name_len);
448 if (c == 0 && name_len > xattr->name_len)
449 c = 1;
450 if (c < 0)
451 p = &(*p)->rb_left;
452 else if (c > 0)
453 p = &(*p)->rb_right;
454 else {
455 dout("__get_xattr %s: found %.*s\n", name,
456 xattr->val_len, xattr->val);
457 return xattr;
458 }
459 }
460
461 dout("__get_xattr %s: not found\n", name);
462
463 return NULL;
464}
465
466static void __free_xattr(struct ceph_inode_xattr *xattr)
467{
468 BUG_ON(!xattr);
469
470 if (xattr->should_free_name)
471 kfree((void *)xattr->name);
472 if (xattr->should_free_val)
473 kfree((void *)xattr->val);
474
475 kfree(xattr);
476}
477
478static int __remove_xattr(struct ceph_inode_info *ci,
479 struct ceph_inode_xattr *xattr)
480{
481 if (!xattr)
482 return -ENODATA;
483
484 rb_erase(&xattr->node, &ci->i_xattrs.index);
485
486 if (xattr->should_free_name)
487 kfree((void *)xattr->name);
488 if (xattr->should_free_val)
489 kfree((void *)xattr->val);
490
491 ci->i_xattrs.names_size -= xattr->name_len;
492 ci->i_xattrs.vals_size -= xattr->val_len;
493 ci->i_xattrs.count--;
494 kfree(xattr);
495
496 return 0;
497}
498
499static int __remove_xattr_by_name(struct ceph_inode_info *ci,
500 const char *name)
501{
502 struct rb_node **p;
503 struct ceph_inode_xattr *xattr;
504 int err;
505
506 p = &ci->i_xattrs.index.rb_node;
507 xattr = __get_xattr(ci, name);
508 err = __remove_xattr(ci, xattr);
509 return err;
510}
511
512static char *__copy_xattr_names(struct ceph_inode_info *ci,
513 char *dest)
514{
515 struct rb_node *p;
516 struct ceph_inode_xattr *xattr = NULL;
517
518 p = rb_first(&ci->i_xattrs.index);
519 dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count);
520
521 while (p) {
522 xattr = rb_entry(p, struct ceph_inode_xattr, node);
523 memcpy(dest, xattr->name, xattr->name_len);
524 dest[xattr->name_len] = '\0';
525
526 dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name,
527 xattr->name_len, ci->i_xattrs.names_size);
528
529 dest += xattr->name_len + 1;
530 p = rb_next(p);
531 }
532
533 return dest;
534}
535
536void __ceph_destroy_xattrs(struct ceph_inode_info *ci)
537{
538 struct rb_node *p, *tmp;
539 struct ceph_inode_xattr *xattr = NULL;
540
541 p = rb_first(&ci->i_xattrs.index);
542
543 dout("__ceph_destroy_xattrs p=%p\n", p);
544
545 while (p) {
546 xattr = rb_entry(p, struct ceph_inode_xattr, node);
547 tmp = p;
548 p = rb_next(tmp);
549 dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p,
550 xattr->name_len, xattr->name);
551 rb_erase(tmp, &ci->i_xattrs.index);
552
553 __free_xattr(xattr);
554 }
555
556 ci->i_xattrs.names_size = 0;
557 ci->i_xattrs.vals_size = 0;
558 ci->i_xattrs.index_version = 0;
559 ci->i_xattrs.count = 0;
560 ci->i_xattrs.index = RB_ROOT;
561}
562
563static int __build_xattrs(struct inode *inode)
564 __releases(ci->i_ceph_lock)
565 __acquires(ci->i_ceph_lock)
566{
567 u32 namelen;
568 u32 numattr = 0;
569 void *p, *end;
570 u32 len;
571 const char *name, *val;
572 struct ceph_inode_info *ci = ceph_inode(inode);
573 int xattr_version;
574 struct ceph_inode_xattr **xattrs = NULL;
575 int err = 0;
576 int i;
577
578 dout("__build_xattrs() len=%d\n",
579 ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0);
580
581 if (ci->i_xattrs.index_version >= ci->i_xattrs.version)
582 return 0;
583
584 __ceph_destroy_xattrs(ci);
585
586start:
587
588 if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) {
589 p = ci->i_xattrs.blob->vec.iov_base;
590 end = p + ci->i_xattrs.blob->vec.iov_len;
591 ceph_decode_32_safe(&p, end, numattr, bad);
592 xattr_version = ci->i_xattrs.version;
593 spin_unlock(&ci->i_ceph_lock);
594
595 xattrs = kcalloc(numattr, sizeof(struct ceph_inode_xattr *),
596 GFP_NOFS);
597 err = -ENOMEM;
598 if (!xattrs)
599 goto bad_lock;
600
601 for (i = 0; i < numattr; i++) {
602 xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr),
603 GFP_NOFS);
604 if (!xattrs[i])
605 goto bad_lock;
606 }
607
608 spin_lock(&ci->i_ceph_lock);
609 if (ci->i_xattrs.version != xattr_version) {
610
611 for (i = 0; i < numattr; i++)
612 kfree(xattrs[i]);
613 kfree(xattrs);
614 xattrs = NULL;
615 goto start;
616 }
617 err = -EIO;
618 while (numattr--) {
619 ceph_decode_32_safe(&p, end, len, bad);
620 namelen = len;
621 name = p;
622 p += len;
623 ceph_decode_32_safe(&p, end, len, bad);
624 val = p;
625 p += len;
626
627 err = __set_xattr(ci, name, namelen, val, len,
628 0, 0, &xattrs[numattr]);
629
630 if (err < 0)
631 goto bad;
632 }
633 kfree(xattrs);
634 }
635 ci->i_xattrs.index_version = ci->i_xattrs.version;
636 ci->i_xattrs.dirty = false;
637
638 return err;
639bad_lock:
640 spin_lock(&ci->i_ceph_lock);
641bad:
642 if (xattrs) {
643 for (i = 0; i < numattr; i++)
644 kfree(xattrs[i]);
645 kfree(xattrs);
646 }
647 ci->i_xattrs.names_size = 0;
648 return err;
649}
650
651static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size,
652 int val_size)
653{
654
655
656
657
658 int size = 4 + ci->i_xattrs.count*(4 + 4) +
659 ci->i_xattrs.names_size +
660 ci->i_xattrs.vals_size;
661 dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n",
662 ci->i_xattrs.count, ci->i_xattrs.names_size,
663 ci->i_xattrs.vals_size);
664
665 if (name_size)
666 size += 4 + 4 + name_size + val_size;
667
668 return size;
669}
670
671
672
673
674
675void __ceph_build_xattrs_blob(struct ceph_inode_info *ci)
676{
677 struct rb_node *p;
678 struct ceph_inode_xattr *xattr = NULL;
679 void *dest;
680
681 dout("__build_xattrs_blob %p\n", &ci->vfs_inode);
682 if (ci->i_xattrs.dirty) {
683 int need = __get_required_blob_size(ci, 0, 0);
684
685 BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len);
686
687 p = rb_first(&ci->i_xattrs.index);
688 dest = ci->i_xattrs.prealloc_blob->vec.iov_base;
689
690 ceph_encode_32(&dest, ci->i_xattrs.count);
691 while (p) {
692 xattr = rb_entry(p, struct ceph_inode_xattr, node);
693
694 ceph_encode_32(&dest, xattr->name_len);
695 memcpy(dest, xattr->name, xattr->name_len);
696 dest += xattr->name_len;
697 ceph_encode_32(&dest, xattr->val_len);
698 memcpy(dest, xattr->val, xattr->val_len);
699 dest += xattr->val_len;
700
701 p = rb_next(p);
702 }
703
704
705 ci->i_xattrs.prealloc_blob->vec.iov_len =
706 dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
707
708 if (ci->i_xattrs.blob)
709 ceph_buffer_put(ci->i_xattrs.blob);
710 ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
711 ci->i_xattrs.prealloc_blob = NULL;
712 ci->i_xattrs.dirty = false;
713 ci->i_xattrs.version++;
714 }
715}
716
717ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
718 size_t size)
719{
720 struct ceph_inode_info *ci = ceph_inode(inode);
721 int err;
722 struct ceph_inode_xattr *xattr;
723 struct ceph_vxattr *vxattr = NULL;
724
725 if (!ceph_is_valid_xattr(name))
726 return -ENODATA;
727
728
729 vxattr = ceph_match_vxattr(inode, name);
730 if (vxattr && !(vxattr->exists_cb && !vxattr->exists_cb(ci))) {
731 err = vxattr->getxattr_cb(ci, value, size);
732 return err;
733 }
734
735 spin_lock(&ci->i_ceph_lock);
736 dout("getxattr %p ver=%lld index_ver=%lld\n", inode,
737 ci->i_xattrs.version, ci->i_xattrs.index_version);
738
739 if (ci->i_xattrs.version == 0 ||
740 !__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1)) {
741 spin_unlock(&ci->i_ceph_lock);
742
743 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
744 if (err)
745 return err;
746 spin_lock(&ci->i_ceph_lock);
747 }
748
749 err = __build_xattrs(inode);
750 if (err < 0)
751 goto out;
752
753 err = -ENODATA;
754 xattr = __get_xattr(ci, name);
755 if (!xattr)
756 goto out;
757
758 err = -ERANGE;
759 if (size && size < xattr->val_len)
760 goto out;
761
762 err = xattr->val_len;
763 if (size == 0)
764 goto out;
765
766 memcpy(value, xattr->val, xattr->val_len);
767
768out:
769 spin_unlock(&ci->i_ceph_lock);
770 return err;
771}
772
773ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
774 size_t size)
775{
776 if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
777 return generic_getxattr(dentry, name, value, size);
778
779 return __ceph_getxattr(d_inode(dentry), name, value, size);
780}
781
782ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
783{
784 struct inode *inode = d_inode(dentry);
785 struct ceph_inode_info *ci = ceph_inode(inode);
786 struct ceph_vxattr *vxattrs = ceph_inode_vxattrs(inode);
787 u32 vir_namelen = 0;
788 u32 namelen;
789 int err;
790 u32 len;
791 int i;
792
793 spin_lock(&ci->i_ceph_lock);
794 dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
795 ci->i_xattrs.version, ci->i_xattrs.index_version);
796
797 if (ci->i_xattrs.version == 0 ||
798 !__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1)) {
799 spin_unlock(&ci->i_ceph_lock);
800 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
801 if (err)
802 return err;
803 spin_lock(&ci->i_ceph_lock);
804 }
805
806 err = __build_xattrs(inode);
807 if (err < 0)
808 goto out;
809
810
811
812
813 vir_namelen = ceph_vxattrs_name_size(vxattrs);
814
815
816 namelen = ci->i_xattrs.names_size + ci->i_xattrs.count;
817 err = -ERANGE;
818 if (size && vir_namelen + namelen > size)
819 goto out;
820
821 err = namelen + vir_namelen;
822 if (size == 0)
823 goto out;
824
825 names = __copy_xattr_names(ci, names);
826
827
828 err = namelen;
829 if (vxattrs) {
830 for (i = 0; vxattrs[i].name; i++) {
831 if (!vxattrs[i].hidden &&
832 !(vxattrs[i].exists_cb &&
833 !vxattrs[i].exists_cb(ci))) {
834 len = sprintf(names, "%s", vxattrs[i].name);
835 names += len + 1;
836 err += len + 1;
837 }
838 }
839 }
840
841out:
842 spin_unlock(&ci->i_ceph_lock);
843 return err;
844}
845
846static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
847 const char *value, size_t size, int flags)
848{
849 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
850 struct inode *inode = d_inode(dentry);
851 struct ceph_inode_info *ci = ceph_inode(inode);
852 struct ceph_mds_request *req;
853 struct ceph_mds_client *mdsc = fsc->mdsc;
854 struct ceph_pagelist *pagelist = NULL;
855 int err;
856
857 if (size > 0) {
858
859 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
860 if (!pagelist)
861 return -ENOMEM;
862
863 ceph_pagelist_init(pagelist);
864 err = ceph_pagelist_append(pagelist, value, size);
865 if (err)
866 goto out;
867 } else if (!value) {
868 flags |= CEPH_XATTR_REMOVE;
869 }
870
871 dout("setxattr value=%.*s\n", (int)size, value);
872
873
874 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETXATTR,
875 USE_AUTH_MDS);
876 if (IS_ERR(req)) {
877 err = PTR_ERR(req);
878 goto out;
879 }
880
881 req->r_args.setxattr.flags = cpu_to_le32(flags);
882 req->r_path2 = kstrdup(name, GFP_NOFS);
883 if (!req->r_path2) {
884 ceph_mdsc_put_request(req);
885 err = -ENOMEM;
886 goto out;
887 }
888
889 req->r_pagelist = pagelist;
890 pagelist = NULL;
891
892 req->r_inode = inode;
893 ihold(inode);
894 req->r_num_caps = 1;
895 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
896
897 dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
898 err = ceph_mdsc_do_request(mdsc, NULL, req);
899 ceph_mdsc_put_request(req);
900 dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
901
902out:
903 if (pagelist)
904 ceph_pagelist_release(pagelist);
905 return err;
906}
907
908int __ceph_setxattr(struct dentry *dentry, const char *name,
909 const void *value, size_t size, int flags)
910{
911 struct inode *inode = d_inode(dentry);
912 struct ceph_vxattr *vxattr;
913 struct ceph_inode_info *ci = ceph_inode(inode);
914 struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
915 struct ceph_cap_flush *prealloc_cf = NULL;
916 int issued;
917 int err;
918 int dirty = 0;
919 int name_len = strlen(name);
920 int val_len = size;
921 char *newname = NULL;
922 char *newval = NULL;
923 struct ceph_inode_xattr *xattr = NULL;
924 int required_blob_size;
925 bool lock_snap_rwsem = false;
926
927 if (!ceph_is_valid_xattr(name))
928 return -EOPNOTSUPP;
929
930 vxattr = ceph_match_vxattr(inode, name);
931 if (vxattr && vxattr->readonly)
932 return -EOPNOTSUPP;
933
934
935 if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
936 goto do_sync_unlocked;
937
938
939 err = -ENOMEM;
940 newname = kmemdup(name, name_len + 1, GFP_NOFS);
941 if (!newname)
942 goto out;
943
944 if (val_len) {
945 newval = kmemdup(value, val_len, GFP_NOFS);
946 if (!newval)
947 goto out;
948 }
949
950 xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS);
951 if (!xattr)
952 goto out;
953
954 prealloc_cf = ceph_alloc_cap_flush();
955 if (!prealloc_cf)
956 goto out;
957
958 spin_lock(&ci->i_ceph_lock);
959retry:
960 issued = __ceph_caps_issued(ci, NULL);
961 if (ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))
962 goto do_sync;
963
964 if (!lock_snap_rwsem && !ci->i_head_snapc) {
965 lock_snap_rwsem = true;
966 if (!down_read_trylock(&mdsc->snap_rwsem)) {
967 spin_unlock(&ci->i_ceph_lock);
968 down_read(&mdsc->snap_rwsem);
969 spin_lock(&ci->i_ceph_lock);
970 goto retry;
971 }
972 }
973
974 dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued));
975 __build_xattrs(inode);
976
977 required_blob_size = __get_required_blob_size(ci, name_len, val_len);
978
979 if (!ci->i_xattrs.prealloc_blob ||
980 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
981 struct ceph_buffer *blob;
982
983 spin_unlock(&ci->i_ceph_lock);
984 dout(" preaallocating new blob size=%d\n", required_blob_size);
985 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
986 if (!blob)
987 goto do_sync_unlocked;
988 spin_lock(&ci->i_ceph_lock);
989 if (ci->i_xattrs.prealloc_blob)
990 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
991 ci->i_xattrs.prealloc_blob = blob;
992 goto retry;
993 }
994
995 err = __set_xattr(ci, newname, name_len, newval, val_len,
996 flags, value ? 1 : -1, &xattr);
997
998 if (!err) {
999 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL,
1000 &prealloc_cf);
1001 ci->i_xattrs.dirty = true;
1002 inode->i_ctime = CURRENT_TIME;
1003 }
1004
1005 spin_unlock(&ci->i_ceph_lock);
1006 if (lock_snap_rwsem)
1007 up_read(&mdsc->snap_rwsem);
1008 if (dirty)
1009 __mark_inode_dirty(inode, dirty);
1010 ceph_free_cap_flush(prealloc_cf);
1011 return err;
1012
1013do_sync:
1014 spin_unlock(&ci->i_ceph_lock);
1015do_sync_unlocked:
1016 if (lock_snap_rwsem)
1017 up_read(&mdsc->snap_rwsem);
1018 err = ceph_sync_setxattr(dentry, name, value, size, flags);
1019out:
1020 ceph_free_cap_flush(prealloc_cf);
1021 kfree(newname);
1022 kfree(newval);
1023 kfree(xattr);
1024 return err;
1025}
1026
1027int ceph_setxattr(struct dentry *dentry, const char *name,
1028 const void *value, size_t size, int flags)
1029{
1030 if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
1031 return -EROFS;
1032
1033 if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
1034 return generic_setxattr(dentry, name, value, size, flags);
1035
1036 if (size == 0)
1037 value = "";
1038
1039 return __ceph_setxattr(dentry, name, value, size, flags);
1040}
1041
1042static int ceph_send_removexattr(struct dentry *dentry, const char *name)
1043{
1044 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
1045 struct ceph_mds_client *mdsc = fsc->mdsc;
1046 struct inode *inode = d_inode(dentry);
1047 struct ceph_mds_request *req;
1048 int err;
1049
1050 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RMXATTR,
1051 USE_AUTH_MDS);
1052 if (IS_ERR(req))
1053 return PTR_ERR(req);
1054 req->r_path2 = kstrdup(name, GFP_NOFS);
1055 if (!req->r_path2)
1056 return -ENOMEM;
1057
1058 req->r_inode = inode;
1059 ihold(inode);
1060 req->r_num_caps = 1;
1061 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
1062 err = ceph_mdsc_do_request(mdsc, NULL, req);
1063 ceph_mdsc_put_request(req);
1064 return err;
1065}
1066
1067int __ceph_removexattr(struct dentry *dentry, const char *name)
1068{
1069 struct inode *inode = d_inode(dentry);
1070 struct ceph_vxattr *vxattr;
1071 struct ceph_inode_info *ci = ceph_inode(inode);
1072 struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1073 struct ceph_cap_flush *prealloc_cf = NULL;
1074 int issued;
1075 int err;
1076 int required_blob_size;
1077 int dirty;
1078 bool lock_snap_rwsem = false;
1079
1080 if (!ceph_is_valid_xattr(name))
1081 return -EOPNOTSUPP;
1082
1083 vxattr = ceph_match_vxattr(inode, name);
1084 if (vxattr && vxattr->readonly)
1085 return -EOPNOTSUPP;
1086
1087
1088 if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
1089 goto do_sync_unlocked;
1090
1091 prealloc_cf = ceph_alloc_cap_flush();
1092 if (!prealloc_cf)
1093 return -ENOMEM;
1094
1095 err = -ENOMEM;
1096 spin_lock(&ci->i_ceph_lock);
1097retry:
1098 issued = __ceph_caps_issued(ci, NULL);
1099 if (ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))
1100 goto do_sync;
1101
1102 if (!lock_snap_rwsem && !ci->i_head_snapc) {
1103 lock_snap_rwsem = true;
1104 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1105 spin_unlock(&ci->i_ceph_lock);
1106 down_read(&mdsc->snap_rwsem);
1107 spin_lock(&ci->i_ceph_lock);
1108 goto retry;
1109 }
1110 }
1111
1112 dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued));
1113
1114 __build_xattrs(inode);
1115
1116 required_blob_size = __get_required_blob_size(ci, 0, 0);
1117
1118 if (!ci->i_xattrs.prealloc_blob ||
1119 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
1120 struct ceph_buffer *blob;
1121
1122 spin_unlock(&ci->i_ceph_lock);
1123 dout(" preaallocating new blob size=%d\n", required_blob_size);
1124 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
1125 if (!blob)
1126 goto do_sync_unlocked;
1127 spin_lock(&ci->i_ceph_lock);
1128 if (ci->i_xattrs.prealloc_blob)
1129 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
1130 ci->i_xattrs.prealloc_blob = blob;
1131 goto retry;
1132 }
1133
1134 err = __remove_xattr_by_name(ceph_inode(inode), name);
1135
1136 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL,
1137 &prealloc_cf);
1138 ci->i_xattrs.dirty = true;
1139 inode->i_ctime = CURRENT_TIME;
1140 spin_unlock(&ci->i_ceph_lock);
1141 if (lock_snap_rwsem)
1142 up_read(&mdsc->snap_rwsem);
1143 if (dirty)
1144 __mark_inode_dirty(inode, dirty);
1145 ceph_free_cap_flush(prealloc_cf);
1146 return err;
1147do_sync:
1148 spin_unlock(&ci->i_ceph_lock);
1149do_sync_unlocked:
1150 if (lock_snap_rwsem)
1151 up_read(&mdsc->snap_rwsem);
1152 ceph_free_cap_flush(prealloc_cf);
1153 err = ceph_send_removexattr(dentry, name);
1154 return err;
1155}
1156
1157int ceph_removexattr(struct dentry *dentry, const char *name)
1158{
1159 if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
1160 return -EROFS;
1161
1162 if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
1163 return generic_removexattr(dentry, name);
1164
1165 return __ceph_removexattr(dentry, name);
1166}
1167
