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
19const struct xattr_handler ceph_other_xattr_handler;
20
21
22
23
24
25const struct xattr_handler *ceph_xattr_handlers[] = {
26#ifdef CONFIG_CEPH_FS_POSIX_ACL
27 &posix_acl_access_xattr_handler,
28 &posix_acl_default_xattr_handler,
29#endif
30 &ceph_other_xattr_handler,
31 NULL,
32};
33
34static bool ceph_is_valid_xattr(const char *name)
35{
36 return !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) ||
37 !strncmp(name, XATTR_SECURITY_PREFIX,
38 XATTR_SECURITY_PREFIX_LEN) ||
39 !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) ||
40 !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
41}
42
43
44
45
46
47struct ceph_vxattr {
48 char *name;
49 size_t name_size;
50 size_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val,
51 size_t size);
52 bool readonly, hidden;
53 bool (*exists_cb)(struct ceph_inode_info *ci);
54};
55
56
57
58static bool ceph_vxattrcb_layout_exists(struct ceph_inode_info *ci)
59{
60 struct ceph_file_layout *fl = &ci->i_layout;
61 return (fl->stripe_unit > 0 || fl->stripe_count > 0 ||
62 fl->object_size > 0 || fl->pool_id >= 0 ||
63 rcu_dereference_raw(fl->pool_ns) != NULL);
64}
65
66static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
67 size_t size)
68{
69 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
70 struct ceph_osd_client *osdc = &fsc->client->osdc;
71 struct ceph_string *pool_ns;
72 s64 pool = ci->i_layout.pool_id;
73 const char *pool_name;
74 const char *ns_field = " pool_namespace=";
75 char buf[128];
76 size_t len, total_len = 0;
77 int ret;
78
79 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);
80
81 dout("ceph_vxattrcb_layout %p\n", &ci->vfs_inode);
82 down_read(&osdc->lock);
83 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
84 if (pool_name) {
85 len = snprintf(buf, sizeof(buf),
86 "stripe_unit=%u stripe_count=%u object_size=%u pool=",
87 ci->i_layout.stripe_unit, ci->i_layout.stripe_count,
88 ci->i_layout.object_size);
89 total_len = len + strlen(pool_name);
90 } else {
91 len = snprintf(buf, sizeof(buf),
92 "stripe_unit=%u stripe_count=%u object_size=%u pool=%lld",
93 ci->i_layout.stripe_unit, ci->i_layout.stripe_count,
94 ci->i_layout.object_size, (unsigned long long)pool);
95 total_len = len;
96 }
97
98 if (pool_ns)
99 total_len += strlen(ns_field) + pool_ns->len;
100
101 if (!size) {
102 ret = total_len;
103 } else if (total_len > size) {
104 ret = -ERANGE;
105 } else {
106 memcpy(val, buf, len);
107 ret = len;
108 if (pool_name) {
109 len = strlen(pool_name);
110 memcpy(val + ret, pool_name, len);
111 ret += len;
112 }
113 if (pool_ns) {
114 len = strlen(ns_field);
115 memcpy(val + ret, ns_field, len);
116 ret += len;
117 memcpy(val + ret, pool_ns->str, pool_ns->len);
118 ret += pool_ns->len;
119 }
120 }
121 up_read(&osdc->lock);
122 ceph_put_string(pool_ns);
123 return ret;
124}
125
126static size_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci,
127 char *val, size_t size)
128{
129 return snprintf(val, size, "%u", ci->i_layout.stripe_unit);
130}
131
132static size_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci,
133 char *val, size_t size)
134{
135 return snprintf(val, size, "%u", ci->i_layout.stripe_count);
136}
137
138static size_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci,
139 char *val, size_t size)
140{
141 return snprintf(val, size, "%u", ci->i_layout.object_size);
142}
143
144static size_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci,
145 char *val, size_t size)
146{
147 int ret;
148 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
149 struct ceph_osd_client *osdc = &fsc->client->osdc;
150 s64 pool = ci->i_layout.pool_id;
151 const char *pool_name;
152
153 down_read(&osdc->lock);
154 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
155 if (pool_name)
156 ret = snprintf(val, size, "%s", pool_name);
157 else
158 ret = snprintf(val, size, "%lld", (unsigned long long)pool);
159 up_read(&osdc->lock);
160 return ret;
161}
162
163static size_t ceph_vxattrcb_layout_pool_namespace(struct ceph_inode_info *ci,
164 char *val, size_t size)
165{
166 int ret = 0;
167 struct ceph_string *ns = ceph_try_get_string(ci->i_layout.pool_ns);
168 if (ns) {
169 ret = snprintf(val, size, "%.*s", (int)ns->len, ns->str);
170 ceph_put_string(ns);
171 }
172 return ret;
173}
174
175
176
177static size_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val,
178 size_t size)
179{
180 return snprintf(val, size, "%lld", ci->i_files + ci->i_subdirs);
181}
182
183static size_t ceph_vxattrcb_dir_files(struct ceph_inode_info *ci, char *val,
184 size_t size)
185{
186 return snprintf(val, size, "%lld", ci->i_files);
187}
188
189static size_t ceph_vxattrcb_dir_subdirs(struct ceph_inode_info *ci, char *val,
190 size_t size)
191{
192 return snprintf(val, size, "%lld", ci->i_subdirs);
193}
194
195static size_t ceph_vxattrcb_dir_rentries(struct ceph_inode_info *ci, char *val,
196 size_t size)
197{
198 return snprintf(val, size, "%lld", ci->i_rfiles + ci->i_rsubdirs);
199}
200
201static size_t ceph_vxattrcb_dir_rfiles(struct ceph_inode_info *ci, char *val,
202 size_t size)
203{
204 return snprintf(val, size, "%lld", ci->i_rfiles);
205}
206
207static size_t ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info *ci, char *val,
208 size_t size)
209{
210 return snprintf(val, size, "%lld", ci->i_rsubdirs);
211}
212
213static size_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val,
214 size_t size)
215{
216 return snprintf(val, size, "%lld", ci->i_rbytes);
217}
218
219static size_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val,
220 size_t size)
221{
222 return snprintf(val, size, "%ld.09%ld", (long)ci->i_rctime.tv_sec,
223 (long)ci->i_rctime.tv_nsec);
224}
225
226
227#define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name
228#define CEPH_XATTR_NAME2(_type, _name, _name2) \
229 XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
230
231#define XATTR_NAME_CEPH(_type, _name) \
232 { \
233 .name = CEPH_XATTR_NAME(_type, _name), \
234 .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \
235 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
236 .readonly = true, \
237 .hidden = false, \
238 .exists_cb = NULL, \
239 }
240#define XATTR_LAYOUT_FIELD(_type, _name, _field) \
241 { \
242 .name = CEPH_XATTR_NAME2(_type, _name, _field), \
243 .name_size = sizeof (CEPH_XATTR_NAME2(_type, _name, _field)), \
244 .getxattr_cb = ceph_vxattrcb_ ## _name ## _ ## _field, \
245 .readonly = false, \
246 .hidden = true, \
247 .exists_cb = ceph_vxattrcb_layout_exists, \
248 }
249
250static struct ceph_vxattr ceph_dir_vxattrs[] = {
251 {
252 .name = "ceph.dir.layout",
253 .name_size = sizeof("ceph.dir.layout"),
254 .getxattr_cb = ceph_vxattrcb_layout,
255 .readonly = false,
256 .hidden = true,
257 .exists_cb = ceph_vxattrcb_layout_exists,
258 },
259 XATTR_LAYOUT_FIELD(dir, layout, stripe_unit),
260 XATTR_LAYOUT_FIELD(dir, layout, stripe_count),
261 XATTR_LAYOUT_FIELD(dir, layout, object_size),
262 XATTR_LAYOUT_FIELD(dir, layout, pool),
263 XATTR_LAYOUT_FIELD(dir, layout, pool_namespace),
264 XATTR_NAME_CEPH(dir, entries),
265 XATTR_NAME_CEPH(dir, files),
266 XATTR_NAME_CEPH(dir, subdirs),
267 XATTR_NAME_CEPH(dir, rentries),
268 XATTR_NAME_CEPH(dir, rfiles),
269 XATTR_NAME_CEPH(dir, rsubdirs),
270 XATTR_NAME_CEPH(dir, rbytes),
271 XATTR_NAME_CEPH(dir, rctime),
272 { .name = NULL, 0 }
273};
274static size_t ceph_dir_vxattrs_name_size;
275
276
277
278static struct ceph_vxattr ceph_file_vxattrs[] = {
279 {
280 .name = "ceph.file.layout",
281 .name_size = sizeof("ceph.file.layout"),
282 .getxattr_cb = ceph_vxattrcb_layout,
283 .readonly = false,
284 .hidden = true,
285 .exists_cb = ceph_vxattrcb_layout_exists,
286 },
287 XATTR_LAYOUT_FIELD(file, layout, stripe_unit),
288 XATTR_LAYOUT_FIELD(file, layout, stripe_count),
289 XATTR_LAYOUT_FIELD(file, layout, object_size),
290 XATTR_LAYOUT_FIELD(file, layout, pool),
291 XATTR_LAYOUT_FIELD(file, layout, pool_namespace),
292 { .name = NULL, 0 }
293};
294static size_t ceph_file_vxattrs_name_size;
295
296static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode)
297{
298 if (S_ISDIR(inode->i_mode))
299 return ceph_dir_vxattrs;
300 else if (S_ISREG(inode->i_mode))
301 return ceph_file_vxattrs;
302 return NULL;
303}
304
305static size_t ceph_vxattrs_name_size(struct ceph_vxattr *vxattrs)
306{
307 if (vxattrs == ceph_dir_vxattrs)
308 return ceph_dir_vxattrs_name_size;
309 if (vxattrs == ceph_file_vxattrs)
310 return ceph_file_vxattrs_name_size;
311 BUG_ON(vxattrs);
312 return 0;
313}
314
315
316
317
318
319static size_t __init vxattrs_name_size(struct ceph_vxattr *vxattrs)
320{
321 struct ceph_vxattr *vxattr;
322 size_t size = 0;
323
324 for (vxattr = vxattrs; vxattr->name; vxattr++)
325 if (!vxattr->hidden)
326 size += vxattr->name_size;
327
328 return size;
329}
330
331
332
333void __init ceph_xattr_init(void)
334{
335 ceph_dir_vxattrs_name_size = vxattrs_name_size(ceph_dir_vxattrs);
336 ceph_file_vxattrs_name_size = vxattrs_name_size(ceph_file_vxattrs);
337}
338
339void ceph_xattr_exit(void)
340{
341 ceph_dir_vxattrs_name_size = 0;
342 ceph_file_vxattrs_name_size = 0;
343}
344
345static struct ceph_vxattr *ceph_match_vxattr(struct inode *inode,
346 const char *name)
347{
348 struct ceph_vxattr *vxattr = ceph_inode_vxattrs(inode);
349
350 if (vxattr) {
351 while (vxattr->name) {
352 if (!strcmp(vxattr->name, name))
353 return vxattr;
354 vxattr++;
355 }
356 }
357
358 return NULL;
359}
360
361static int __set_xattr(struct ceph_inode_info *ci,
362 const char *name, int name_len,
363 const char *val, int val_len,
364 int flags, int update_xattr,
365 struct ceph_inode_xattr **newxattr)
366{
367 struct rb_node **p;
368 struct rb_node *parent = NULL;
369 struct ceph_inode_xattr *xattr = NULL;
370 int c;
371 int new = 0;
372
373 p = &ci->i_xattrs.index.rb_node;
374 while (*p) {
375 parent = *p;
376 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
377 c = strncmp(name, xattr->name, min(name_len, xattr->name_len));
378 if (c < 0)
379 p = &(*p)->rb_left;
380 else if (c > 0)
381 p = &(*p)->rb_right;
382 else {
383 if (name_len == xattr->name_len)
384 break;
385 else if (name_len < xattr->name_len)
386 p = &(*p)->rb_left;
387 else
388 p = &(*p)->rb_right;
389 }
390 xattr = NULL;
391 }
392
393 if (update_xattr) {
394 int err = 0;
395 if (xattr && (flags & XATTR_CREATE))
396 err = -EEXIST;
397 else if (!xattr && (flags & XATTR_REPLACE))
398 err = -ENODATA;
399 if (err) {
400 kfree(name);
401 kfree(val);
402 return err;
403 }
404 if (update_xattr < 0) {
405 if (xattr)
406 __remove_xattr(ci, xattr);
407 kfree(name);
408 return 0;
409 }
410 }
411
412 if (!xattr) {
413 new = 1;
414 xattr = *newxattr;
415 xattr->name = name;
416 xattr->name_len = name_len;
417 xattr->should_free_name = update_xattr;
418
419 ci->i_xattrs.count++;
420 dout("__set_xattr count=%d\n", ci->i_xattrs.count);
421 } else {
422 kfree(*newxattr);
423 *newxattr = NULL;
424 if (xattr->should_free_val)
425 kfree((void *)xattr->val);
426
427 if (update_xattr) {
428 kfree((void *)name);
429 name = xattr->name;
430 }
431 ci->i_xattrs.names_size -= xattr->name_len;
432 ci->i_xattrs.vals_size -= xattr->val_len;
433 }
434 ci->i_xattrs.names_size += name_len;
435 ci->i_xattrs.vals_size += val_len;
436 if (val)
437 xattr->val = val;
438 else
439 xattr->val = "";
440
441 xattr->val_len = val_len;
442 xattr->dirty = update_xattr;
443 xattr->should_free_val = (val && update_xattr);
444
445 if (new) {
446 rb_link_node(&xattr->node, parent, p);
447 rb_insert_color(&xattr->node, &ci->i_xattrs.index);
448 dout("__set_xattr_val p=%p\n", p);
449 }
450
451 dout("__set_xattr_val added %llx.%llx xattr %p %s=%.*s\n",
452 ceph_vinop(&ci->vfs_inode), xattr, name, val_len, val);
453
454 return 0;
455}
456
457static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci,
458 const char *name)
459{
460 struct rb_node **p;
461 struct rb_node *parent = NULL;
462 struct ceph_inode_xattr *xattr = NULL;
463 int name_len = strlen(name);
464 int c;
465
466 p = &ci->i_xattrs.index.rb_node;
467 while (*p) {
468 parent = *p;
469 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
470 c = strncmp(name, xattr->name, xattr->name_len);
471 if (c == 0 && name_len > xattr->name_len)
472 c = 1;
473 if (c < 0)
474 p = &(*p)->rb_left;
475 else if (c > 0)
476 p = &(*p)->rb_right;
477 else {
478 dout("__get_xattr %s: found %.*s\n", name,
479 xattr->val_len, xattr->val);
480 return xattr;
481 }
482 }
483
484 dout("__get_xattr %s: not found\n", name);
485
486 return NULL;
487}
488
489static void __free_xattr(struct ceph_inode_xattr *xattr)
490{
491 BUG_ON(!xattr);
492
493 if (xattr->should_free_name)
494 kfree((void *)xattr->name);
495 if (xattr->should_free_val)
496 kfree((void *)xattr->val);
497
498 kfree(xattr);
499}
500
501static int __remove_xattr(struct ceph_inode_info *ci,
502 struct ceph_inode_xattr *xattr)
503{
504 if (!xattr)
505 return -ENODATA;
506
507 rb_erase(&xattr->node, &ci->i_xattrs.index);
508
509 if (xattr->should_free_name)
510 kfree((void *)xattr->name);
511 if (xattr->should_free_val)
512 kfree((void *)xattr->val);
513
514 ci->i_xattrs.names_size -= xattr->name_len;
515 ci->i_xattrs.vals_size -= xattr->val_len;
516 ci->i_xattrs.count--;
517 kfree(xattr);
518
519 return 0;
520}
521
522static char *__copy_xattr_names(struct ceph_inode_info *ci,
523 char *dest)
524{
525 struct rb_node *p;
526 struct ceph_inode_xattr *xattr = NULL;
527
528 p = rb_first(&ci->i_xattrs.index);
529 dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count);
530
531 while (p) {
532 xattr = rb_entry(p, struct ceph_inode_xattr, node);
533 memcpy(dest, xattr->name, xattr->name_len);
534 dest[xattr->name_len] = '\0';
535
536 dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name,
537 xattr->name_len, ci->i_xattrs.names_size);
538
539 dest += xattr->name_len + 1;
540 p = rb_next(p);
541 }
542
543 return dest;
544}
545
546void __ceph_destroy_xattrs(struct ceph_inode_info *ci)
547{
548 struct rb_node *p, *tmp;
549 struct ceph_inode_xattr *xattr = NULL;
550
551 p = rb_first(&ci->i_xattrs.index);
552
553 dout("__ceph_destroy_xattrs p=%p\n", p);
554
555 while (p) {
556 xattr = rb_entry(p, struct ceph_inode_xattr, node);
557 tmp = p;
558 p = rb_next(tmp);
559 dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p,
560 xattr->name_len, xattr->name);
561 rb_erase(tmp, &ci->i_xattrs.index);
562
563 __free_xattr(xattr);
564 }
565
566 ci->i_xattrs.names_size = 0;
567 ci->i_xattrs.vals_size = 0;
568 ci->i_xattrs.index_version = 0;
569 ci->i_xattrs.count = 0;
570 ci->i_xattrs.index = RB_ROOT;
571}
572
573static int __build_xattrs(struct inode *inode)
574 __releases(ci->i_ceph_lock)
575 __acquires(ci->i_ceph_lock)
576{
577 u32 namelen;
578 u32 numattr = 0;
579 void *p, *end;
580 u32 len;
581 const char *name, *val;
582 struct ceph_inode_info *ci = ceph_inode(inode);
583 int xattr_version;
584 struct ceph_inode_xattr **xattrs = NULL;
585 int err = 0;
586 int i;
587
588 dout("__build_xattrs() len=%d\n",
589 ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0);
590
591 if (ci->i_xattrs.index_version >= ci->i_xattrs.version)
592 return 0;
593
594 __ceph_destroy_xattrs(ci);
595
596start:
597
598 if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) {
599 p = ci->i_xattrs.blob->vec.iov_base;
600 end = p + ci->i_xattrs.blob->vec.iov_len;
601 ceph_decode_32_safe(&p, end, numattr, bad);
602 xattr_version = ci->i_xattrs.version;
603 spin_unlock(&ci->i_ceph_lock);
604
605 xattrs = kcalloc(numattr, sizeof(struct ceph_inode_xattr *),
606 GFP_NOFS);
607 err = -ENOMEM;
608 if (!xattrs)
609 goto bad_lock;
610
611 for (i = 0; i < numattr; i++) {
612 xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr),
613 GFP_NOFS);
614 if (!xattrs[i])
615 goto bad_lock;
616 }
617
618 spin_lock(&ci->i_ceph_lock);
619 if (ci->i_xattrs.version != xattr_version) {
620
621 for (i = 0; i < numattr; i++)
622 kfree(xattrs[i]);
623 kfree(xattrs);
624 xattrs = NULL;
625 goto start;
626 }
627 err = -EIO;
628 while (numattr--) {
629 ceph_decode_32_safe(&p, end, len, bad);
630 namelen = len;
631 name = p;
632 p += len;
633 ceph_decode_32_safe(&p, end, len, bad);
634 val = p;
635 p += len;
636
637 err = __set_xattr(ci, name, namelen, val, len,
638 0, 0, &xattrs[numattr]);
639
640 if (err < 0)
641 goto bad;
642 }
643 kfree(xattrs);
644 }
645 ci->i_xattrs.index_version = ci->i_xattrs.version;
646 ci->i_xattrs.dirty = false;
647
648 return err;
649bad_lock:
650 spin_lock(&ci->i_ceph_lock);
651bad:
652 if (xattrs) {
653 for (i = 0; i < numattr; i++)
654 kfree(xattrs[i]);
655 kfree(xattrs);
656 }
657 ci->i_xattrs.names_size = 0;
658 return err;
659}
660
661static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size,
662 int val_size)
663{
664
665
666
667
668 int size = 4 + ci->i_xattrs.count*(4 + 4) +
669 ci->i_xattrs.names_size +
670 ci->i_xattrs.vals_size;
671 dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n",
672 ci->i_xattrs.count, ci->i_xattrs.names_size,
673 ci->i_xattrs.vals_size);
674
675 if (name_size)
676 size += 4 + 4 + name_size + val_size;
677
678 return size;
679}
680
681
682
683
684
685void __ceph_build_xattrs_blob(struct ceph_inode_info *ci)
686{
687 struct rb_node *p;
688 struct ceph_inode_xattr *xattr = NULL;
689 void *dest;
690
691 dout("__build_xattrs_blob %p\n", &ci->vfs_inode);
692 if (ci->i_xattrs.dirty) {
693 int need = __get_required_blob_size(ci, 0, 0);
694
695 BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len);
696
697 p = rb_first(&ci->i_xattrs.index);
698 dest = ci->i_xattrs.prealloc_blob->vec.iov_base;
699
700 ceph_encode_32(&dest, ci->i_xattrs.count);
701 while (p) {
702 xattr = rb_entry(p, struct ceph_inode_xattr, node);
703
704 ceph_encode_32(&dest, xattr->name_len);
705 memcpy(dest, xattr->name, xattr->name_len);
706 dest += xattr->name_len;
707 ceph_encode_32(&dest, xattr->val_len);
708 memcpy(dest, xattr->val, xattr->val_len);
709 dest += xattr->val_len;
710
711 p = rb_next(p);
712 }
713
714
715 ci->i_xattrs.prealloc_blob->vec.iov_len =
716 dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
717
718 if (ci->i_xattrs.blob)
719 ceph_buffer_put(ci->i_xattrs.blob);
720 ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
721 ci->i_xattrs.prealloc_blob = NULL;
722 ci->i_xattrs.dirty = false;
723 ci->i_xattrs.version++;
724 }
725}
726
727static inline int __get_request_mask(struct inode *in) {
728 struct ceph_mds_request *req = current->journal_info;
729 int mask = 0;
730 if (req && req->r_target_inode == in) {
731 if (req->r_op == CEPH_MDS_OP_LOOKUP ||
732 req->r_op == CEPH_MDS_OP_LOOKUPINO ||
733 req->r_op == CEPH_MDS_OP_LOOKUPPARENT ||
734 req->r_op == CEPH_MDS_OP_GETATTR) {
735 mask = le32_to_cpu(req->r_args.getattr.mask);
736 } else if (req->r_op == CEPH_MDS_OP_OPEN ||
737 req->r_op == CEPH_MDS_OP_CREATE) {
738 mask = le32_to_cpu(req->r_args.open.mask);
739 }
740 }
741 return mask;
742}
743
744ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
745 size_t size)
746{
747 struct ceph_inode_info *ci = ceph_inode(inode);
748 struct ceph_inode_xattr *xattr;
749 struct ceph_vxattr *vxattr = NULL;
750 int req_mask;
751 int err;
752
753
754 vxattr = ceph_match_vxattr(inode, name);
755 if (vxattr) {
756 err = -ENODATA;
757 if (!(vxattr->exists_cb && !vxattr->exists_cb(ci)))
758 err = vxattr->getxattr_cb(ci, value, size);
759 return err;
760 }
761
762 req_mask = __get_request_mask(inode);
763
764 spin_lock(&ci->i_ceph_lock);
765 dout("getxattr %p ver=%lld index_ver=%lld\n", inode,
766 ci->i_xattrs.version, ci->i_xattrs.index_version);
767
768 if (ci->i_xattrs.version == 0 ||
769 !((req_mask & CEPH_CAP_XATTR_SHARED) ||
770 __ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1))) {
771 spin_unlock(&ci->i_ceph_lock);
772
773
774 if (current->journal_info != NULL) {
775 pr_warn_ratelimited("sync getxattr %p "
776 "during filling trace\n", inode);
777 return -EBUSY;
778 }
779
780
781 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
782 if (err)
783 return err;
784 spin_lock(&ci->i_ceph_lock);
785 }
786
787 err = __build_xattrs(inode);
788 if (err < 0)
789 goto out;
790
791 err = -ENODATA;
792 xattr = __get_xattr(ci, name);
793 if (!xattr)
794 goto out;
795
796 err = -ERANGE;
797 if (size && size < xattr->val_len)
798 goto out;
799
800 err = xattr->val_len;
801 if (size == 0)
802 goto out;
803
804 memcpy(value, xattr->val, xattr->val_len);
805
806 if (current->journal_info != NULL &&
807 !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN))
808 ci->i_ceph_flags |= CEPH_I_SEC_INITED;
809out:
810 spin_unlock(&ci->i_ceph_lock);
811 return err;
812}
813
814ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
815{
816 struct inode *inode = d_inode(dentry);
817 struct ceph_inode_info *ci = ceph_inode(inode);
818 struct ceph_vxattr *vxattrs = ceph_inode_vxattrs(inode);
819 u32 vir_namelen = 0;
820 u32 namelen;
821 int err;
822 u32 len;
823 int i;
824
825 spin_lock(&ci->i_ceph_lock);
826 dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
827 ci->i_xattrs.version, ci->i_xattrs.index_version);
828
829 if (ci->i_xattrs.version == 0 ||
830 !__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1)) {
831 spin_unlock(&ci->i_ceph_lock);
832 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
833 if (err)
834 return err;
835 spin_lock(&ci->i_ceph_lock);
836 }
837
838 err = __build_xattrs(inode);
839 if (err < 0)
840 goto out;
841
842
843
844
845 vir_namelen = ceph_vxattrs_name_size(vxattrs);
846
847
848 namelen = ci->i_xattrs.names_size + ci->i_xattrs.count;
849 err = -ERANGE;
850 if (size && vir_namelen + namelen > size)
851 goto out;
852
853 err = namelen + vir_namelen;
854 if (size == 0)
855 goto out;
856
857 names = __copy_xattr_names(ci, names);
858
859
860 err = namelen;
861 if (vxattrs) {
862 for (i = 0; vxattrs[i].name; i++) {
863 if (!vxattrs[i].hidden &&
864 !(vxattrs[i].exists_cb &&
865 !vxattrs[i].exists_cb(ci))) {
866 len = sprintf(names, "%s", vxattrs[i].name);
867 names += len + 1;
868 err += len + 1;
869 }
870 }
871 }
872
873out:
874 spin_unlock(&ci->i_ceph_lock);
875 return err;
876}
877
878static int ceph_sync_setxattr(struct inode *inode, const char *name,
879 const char *value, size_t size, int flags)
880{
881 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
882 struct ceph_inode_info *ci = ceph_inode(inode);
883 struct ceph_mds_request *req;
884 struct ceph_mds_client *mdsc = fsc->mdsc;
885 struct ceph_pagelist *pagelist = NULL;
886 int op = CEPH_MDS_OP_SETXATTR;
887 int err;
888
889 if (size > 0) {
890
891 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
892 if (!pagelist)
893 return -ENOMEM;
894
895 ceph_pagelist_init(pagelist);
896 err = ceph_pagelist_append(pagelist, value, size);
897 if (err)
898 goto out;
899 } else if (!value) {
900 if (flags & CEPH_XATTR_REPLACE)
901 op = CEPH_MDS_OP_RMXATTR;
902 else
903 flags |= CEPH_XATTR_REMOVE;
904 }
905
906 dout("setxattr value=%.*s\n", (int)size, value);
907
908
909 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
910 if (IS_ERR(req)) {
911 err = PTR_ERR(req);
912 goto out;
913 }
914
915 req->r_path2 = kstrdup(name, GFP_NOFS);
916 if (!req->r_path2) {
917 ceph_mdsc_put_request(req);
918 err = -ENOMEM;
919 goto out;
920 }
921
922 if (op == CEPH_MDS_OP_SETXATTR) {
923 req->r_args.setxattr.flags = cpu_to_le32(flags);
924 req->r_pagelist = pagelist;
925 pagelist = NULL;
926 }
927
928 req->r_inode = inode;
929 ihold(inode);
930 req->r_num_caps = 1;
931 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
932
933 dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
934 err = ceph_mdsc_do_request(mdsc, NULL, req);
935 ceph_mdsc_put_request(req);
936 dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
937
938out:
939 if (pagelist)
940 ceph_pagelist_release(pagelist);
941 return err;
942}
943
944int __ceph_setxattr(struct inode *inode, const char *name,
945 const void *value, size_t size, int flags)
946{
947 struct ceph_vxattr *vxattr;
948 struct ceph_inode_info *ci = ceph_inode(inode);
949 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
950 struct ceph_cap_flush *prealloc_cf = NULL;
951 int issued;
952 int err;
953 int dirty = 0;
954 int name_len = strlen(name);
955 int val_len = size;
956 char *newname = NULL;
957 char *newval = NULL;
958 struct ceph_inode_xattr *xattr = NULL;
959 int required_blob_size;
960 bool lock_snap_rwsem = false;
961
962 if (ceph_snap(inode) != CEPH_NOSNAP)
963 return -EROFS;
964
965 vxattr = ceph_match_vxattr(inode, name);
966 if (vxattr && vxattr->readonly)
967 return -EOPNOTSUPP;
968
969
970 if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
971 goto do_sync_unlocked;
972
973
974 err = -ENOMEM;
975 newname = kmemdup(name, name_len + 1, GFP_NOFS);
976 if (!newname)
977 goto out;
978
979 if (val_len) {
980 newval = kmemdup(value, val_len, GFP_NOFS);
981 if (!newval)
982 goto out;
983 }
984
985 xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS);
986 if (!xattr)
987 goto out;
988
989 prealloc_cf = ceph_alloc_cap_flush();
990 if (!prealloc_cf)
991 goto out;
992
993 spin_lock(&ci->i_ceph_lock);
994retry:
995 issued = __ceph_caps_issued(ci, NULL);
996 if (ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))
997 goto do_sync;
998
999 if (!lock_snap_rwsem && !ci->i_head_snapc) {
1000 lock_snap_rwsem = true;
1001 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1002 spin_unlock(&ci->i_ceph_lock);
1003 down_read(&mdsc->snap_rwsem);
1004 spin_lock(&ci->i_ceph_lock);
1005 goto retry;
1006 }
1007 }
1008
1009 dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued));
1010 __build_xattrs(inode);
1011
1012 required_blob_size = __get_required_blob_size(ci, name_len, val_len);
1013
1014 if (!ci->i_xattrs.prealloc_blob ||
1015 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
1016 struct ceph_buffer *blob;
1017
1018 spin_unlock(&ci->i_ceph_lock);
1019 dout(" preaallocating new blob size=%d\n", required_blob_size);
1020 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
1021 if (!blob)
1022 goto do_sync_unlocked;
1023 spin_lock(&ci->i_ceph_lock);
1024 if (ci->i_xattrs.prealloc_blob)
1025 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
1026 ci->i_xattrs.prealloc_blob = blob;
1027 goto retry;
1028 }
1029
1030 err = __set_xattr(ci, newname, name_len, newval, val_len,
1031 flags, value ? 1 : -1, &xattr);
1032
1033 if (!err) {
1034 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL,
1035 &prealloc_cf);
1036 ci->i_xattrs.dirty = true;
1037 inode->i_ctime = current_fs_time(inode->i_sb);
1038 }
1039
1040 spin_unlock(&ci->i_ceph_lock);
1041 if (lock_snap_rwsem)
1042 up_read(&mdsc->snap_rwsem);
1043 if (dirty)
1044 __mark_inode_dirty(inode, dirty);
1045 ceph_free_cap_flush(prealloc_cf);
1046 return err;
1047
1048do_sync:
1049 spin_unlock(&ci->i_ceph_lock);
1050do_sync_unlocked:
1051 if (lock_snap_rwsem)
1052 up_read(&mdsc->snap_rwsem);
1053
1054
1055 if (current->journal_info != NULL) {
1056 pr_warn_ratelimited("sync setxattr %p "
1057 "during filling trace\n", inode);
1058 err = -EBUSY;
1059 } else {
1060 err = ceph_sync_setxattr(inode, name, value, size, flags);
1061 }
1062out:
1063 ceph_free_cap_flush(prealloc_cf);
1064 kfree(newname);
1065 kfree(newval);
1066 kfree(xattr);
1067 return err;
1068}
1069
1070static int ceph_get_xattr_handler(const struct xattr_handler *handler,
1071 struct dentry *dentry, struct inode *inode,
1072 const char *name, void *value, size_t size)
1073{
1074 if (!ceph_is_valid_xattr(name))
1075 return -EOPNOTSUPP;
1076 return __ceph_getxattr(inode, name, value, size);
1077}
1078
1079static int ceph_set_xattr_handler(const struct xattr_handler *handler,
1080 struct dentry *unused, struct inode *inode,
1081 const char *name, const void *value,
1082 size_t size, int flags)
1083{
1084 if (!ceph_is_valid_xattr(name))
1085 return -EOPNOTSUPP;
1086 return __ceph_setxattr(inode, name, value, size, flags);
1087}
1088
1089const struct xattr_handler ceph_other_xattr_handler = {
1090 .prefix = "",
1091 .get = ceph_get_xattr_handler,
1092 .set = ceph_set_xattr_handler,
1093};
1094
1095#ifdef CONFIG_SECURITY
1096bool ceph_security_xattr_wanted(struct inode *in)
1097{
1098 return in->i_security != NULL;
1099}
1100
1101bool ceph_security_xattr_deadlock(struct inode *in)
1102{
1103 struct ceph_inode_info *ci;
1104 bool ret;
1105 if (in->i_security == NULL)
1106 return false;
1107 ci = ceph_inode(in);
1108 spin_lock(&ci->i_ceph_lock);
1109 ret = !(ci->i_ceph_flags & CEPH_I_SEC_INITED) &&
1110 !(ci->i_xattrs.version > 0 &&
1111 __ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0));
1112 spin_unlock(&ci->i_ceph_lock);
1113 return ret;
1114}
1115#endif
1116
