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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/posix_acl_xattr.h>
10#include <linux/slab.h>
11
12#define XATTR_CEPH_PREFIX "ceph."
13#define XATTR_CEPH_PREFIX_LEN (sizeof (XATTR_CEPH_PREFIX) - 1)
14
15static int __remove_xattr(struct ceph_inode_info *ci,
16 struct ceph_inode_xattr *xattr);
17
18/*
19 * List of handlers for synthetic system.* attributes. Other
20 * attributes are handled directly.
21 */
22const struct xattr_handler *ceph_xattr_handlers[] = {
23#ifdef CONFIG_CEPH_FS_POSIX_ACL
24 &posix_acl_access_xattr_handler,
25 &posix_acl_default_xattr_handler,
26#endif
27 NULL,
28};
29
30static bool ceph_is_valid_xattr(const char *name)
31{
32 return !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) ||
33 !strncmp(name, XATTR_SECURITY_PREFIX,
34 XATTR_SECURITY_PREFIX_LEN) ||
35 !strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) ||
36 !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) ||
37 !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
38}
39
40/*
41 * These define virtual xattrs exposing the recursive directory
42 * statistics and layout metadata.
43 */
44struct ceph_vxattr {
45 char *name;
46 size_t name_size; /* strlen(name) + 1 (for '\0') */
47 size_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val,
48 size_t size);
49 bool readonly, hidden;
50 bool (*exists_cb)(struct ceph_inode_info *ci);
51};
52
53/* layouts */
54
55static bool ceph_vxattrcb_layout_exists(struct ceph_inode_info *ci)
56{
57 size_t s;
58 char *p = (char *)&ci->i_layout;
59
60 for (s = 0; s < sizeof(ci->i_layout); s++, p++)
61 if (*p)
62 return true;
63 return false;
64}
65
66static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
67 size_t size)
68{
69 int ret;
70 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
71 struct ceph_osd_client *osdc = &fsc->client->osdc;
72 s64 pool = ceph_file_layout_pg_pool(ci->i_layout);
73 const char *pool_name;
74 char buf[128];
75
76 dout("ceph_vxattrcb_layout %p\n", &ci->vfs_inode);
77 down_read(&osdc->map_sem);
78 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
79 if (pool_name) {
80 size_t len = strlen(pool_name);
81 ret = snprintf(buf, sizeof(buf),
82 "stripe_unit=%lld stripe_count=%lld object_size=%lld pool=",
83 (unsigned long long)ceph_file_layout_su(ci->i_layout),
84 (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
85 (unsigned long long)ceph_file_layout_object_size(ci->i_layout));
86 if (!size) {
87 ret += len;
88 } else if (ret + len > size) {
89 ret = -ERANGE;
90 } else {
91 memcpy(val, buf, ret);
92 memcpy(val + ret, pool_name, len);
93 ret += len;
94 }
95 } else {
96 ret = snprintf(buf, sizeof(buf),
97 "stripe_unit=%lld stripe_count=%lld object_size=%lld pool=%lld",
98 (unsigned long long)ceph_file_layout_su(ci->i_layout),
99 (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
100 (unsigned long long)ceph_file_layout_object_size(ci->i_layout),
101 (unsigned long long)pool);
102 if (size) {
103 if (ret <= size)
104 memcpy(val, buf, ret);
105 else
106 ret = -ERANGE;
107 }
108 }
109 up_read(&osdc->map_sem);
110 return ret;
111}
112
113static size_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci,
114 char *val, size_t size)
115{
116 return snprintf(val, size, "%lld",
117 (unsigned long long)ceph_file_layout_su(ci->i_layout));
118}
119
120static size_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci,
121 char *val, size_t size)
122{
123 return snprintf(val, size, "%lld",
124 (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout));
125}
126
127static size_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci,
128 char *val, size_t size)
129{
130 return snprintf(val, size, "%lld",
131 (unsigned long long)ceph_file_layout_object_size(ci->i_layout));
132}
133
134static size_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci,
135 char *val, size_t size)
136{
137 int ret;
138 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
139 struct ceph_osd_client *osdc = &fsc->client->osdc;
140 s64 pool = ceph_file_layout_pg_pool(ci->i_layout);
141 const char *pool_name;
142
143 down_read(&osdc->map_sem);
144 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
145 if (pool_name)
146 ret = snprintf(val, size, "%s", pool_name);
147 else
148 ret = snprintf(val, size, "%lld", (unsigned long long)pool);
149 up_read(&osdc->map_sem);
150 return ret;
151}
152
153/* directories */
154
155static size_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val,
156 size_t size)
157{
158 return snprintf(val, size, "%lld", ci->i_files + ci->i_subdirs);
159}
160
161static size_t ceph_vxattrcb_dir_files(struct ceph_inode_info *ci, char *val,
162 size_t size)
163{
164 return snprintf(val, size, "%lld", ci->i_files);
165}
166
167static size_t ceph_vxattrcb_dir_subdirs(struct ceph_inode_info *ci, char *val,
168 size_t size)
169{
170 return snprintf(val, size, "%lld", ci->i_subdirs);
171}
172
173static size_t ceph_vxattrcb_dir_rentries(struct ceph_inode_info *ci, char *val,
174 size_t size)
175{
176 return snprintf(val, size, "%lld", ci->i_rfiles + ci->i_rsubdirs);
177}
178
179static size_t ceph_vxattrcb_dir_rfiles(struct ceph_inode_info *ci, char *val,
180 size_t size)
181{
182 return snprintf(val, size, "%lld", ci->i_rfiles);
183}
184
185static size_t ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info *ci, char *val,
186 size_t size)
187{
188 return snprintf(val, size, "%lld", ci->i_rsubdirs);
189}
190
191static size_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val,
192 size_t size)
193{
194 return snprintf(val, size, "%lld", ci->i_rbytes);
195}
196
197static size_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val,
198 size_t size)
199{
200 return snprintf(val, size, "%ld.09%ld", (long)ci->i_rctime.tv_sec,
201 (long)ci->i_rctime.tv_nsec);
202}
203
204
205#define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name
206#define CEPH_XATTR_NAME2(_type, _name, _name2) \
207 XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
208
209#define XATTR_NAME_CEPH(_type, _name) \
210 { \
211 .name = CEPH_XATTR_NAME(_type, _name), \
212 .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \
213 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
214 .readonly = true, \
215 .hidden = false, \
216 .exists_cb = NULL, \
217 }
218#define XATTR_LAYOUT_FIELD(_type, _name, _field) \
219 { \
220 .name = CEPH_XATTR_NAME2(_type, _name, _field), \
221 .name_size = sizeof (CEPH_XATTR_NAME2(_type, _name, _field)), \
222 .getxattr_cb = ceph_vxattrcb_ ## _name ## _ ## _field, \
223 .readonly = false, \
224 .hidden = true, \
225 .exists_cb = ceph_vxattrcb_layout_exists, \
226 }
227
228static struct ceph_vxattr ceph_dir_vxattrs[] = {
229 {
230 .name = "ceph.dir.layout",
231 .name_size = sizeof("ceph.dir.layout"),
232 .getxattr_cb = ceph_vxattrcb_layout,
233 .readonly = false,
234 .hidden = true,
235 .exists_cb = ceph_vxattrcb_layout_exists,
236 },
237 XATTR_LAYOUT_FIELD(dir, layout, stripe_unit),
238 XATTR_LAYOUT_FIELD(dir, layout, stripe_count),
239 XATTR_LAYOUT_FIELD(dir, layout, object_size),
240 XATTR_LAYOUT_FIELD(dir, layout, pool),
241 XATTR_NAME_CEPH(dir, entries),
242 XATTR_NAME_CEPH(dir, files),
243 XATTR_NAME_CEPH(dir, subdirs),
244 XATTR_NAME_CEPH(dir, rentries),
245 XATTR_NAME_CEPH(dir, rfiles),
246 XATTR_NAME_CEPH(dir, rsubdirs),
247 XATTR_NAME_CEPH(dir, rbytes),
248 XATTR_NAME_CEPH(dir, rctime),
249 { .name = NULL, 0 } /* Required table terminator */
250};
251static size_t ceph_dir_vxattrs_name_size; /* total size of all names */
252
253/* files */
254
255static struct ceph_vxattr ceph_file_vxattrs[] = {
256 {
257 .name = "ceph.file.layout",
258 .name_size = sizeof("ceph.file.layout"),
259 .getxattr_cb = ceph_vxattrcb_layout,
260 .readonly = false,
261 .hidden = true,
262 .exists_cb = ceph_vxattrcb_layout_exists,
263 },
264 XATTR_LAYOUT_FIELD(file, layout, stripe_unit),
265 XATTR_LAYOUT_FIELD(file, layout, stripe_count),
266 XATTR_LAYOUT_FIELD(file, layout, object_size),
267 XATTR_LAYOUT_FIELD(file, layout, pool),
268 { .name = NULL, 0 } /* Required table terminator */
269};
270static size_t ceph_file_vxattrs_name_size; /* total size of all names */
271
272static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode)
273{
274 if (S_ISDIR(inode->i_mode))
275 return ceph_dir_vxattrs;
276 else if (S_ISREG(inode->i_mode))
277 return ceph_file_vxattrs;
278 return NULL;
279}
280
281static size_t ceph_vxattrs_name_size(struct ceph_vxattr *vxattrs)
282{
283 if (vxattrs == ceph_dir_vxattrs)
284 return ceph_dir_vxattrs_name_size;
285 if (vxattrs == ceph_file_vxattrs)
286 return ceph_file_vxattrs_name_size;
287 BUG();
288
289 return 0;
290}
291
292/*
293 * Compute the aggregate size (including terminating '\0') of all
294 * virtual extended attribute names in the given vxattr table.
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/* Routines called at initialization and exit time */
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; /* already built */
583
584 __ceph_destroy_xattrs(ci);
585
586start:
587 /* updated internal xattr rb tree */
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_xattr *),
596 GFP_NOFS);
597 err = -ENOMEM;
598 if (!xattrs)
599 goto bad_lock;
600 memset(xattrs, 0, numattr*sizeof(struct ceph_xattr *));
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 /* lost a race, retry */
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 * 4 bytes for the length, and additional 4 bytes per each xattr name,
656 * 4 bytes per each value
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 * If there are dirty xattrs, reencode xattrs into the prealloc_blob
673 * and swap into place.
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 /* adjust buffer len; it may be larger than we need */
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 /* let's see if a virtual xattr was requested */
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 (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
740 (ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
741 goto get_xattr;
742 } else {
743 spin_unlock(&ci->i_ceph_lock);
744 /* get xattrs from mds (if we don't already have them) */
745 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
746 if (err)
747 return err;
748 }
749
750 spin_lock(&ci->i_ceph_lock);
751
752 err = __build_xattrs(inode);
753 if (err < 0)
754 goto out;
755
756get_xattr:
757 err = -ENODATA; /* == ENOATTR */
758 xattr = __get_xattr(ci, name);
759 if (!xattr)
760 goto out;
761
762 err = -ERANGE;
763 if (size && size < xattr->val_len)
764 goto out;
765
766 err = xattr->val_len;
767 if (size == 0)
768 goto out;
769
770 memcpy(value, xattr->val, xattr->val_len);
771
772out:
773 spin_unlock(&ci->i_ceph_lock);
774 return err;
775}
776
777ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
778 size_t size)
779{
780 if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
781 return generic_getxattr(dentry, name, value, size);
782
783 return __ceph_getxattr(dentry->d_inode, name, value, size);
784}
785
786ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
787{
788 struct inode *inode = dentry->d_inode;
789 struct ceph_inode_info *ci = ceph_inode(inode);
790 struct ceph_vxattr *vxattrs = ceph_inode_vxattrs(inode);
791 u32 vir_namelen = 0;
792 u32 namelen;
793 int err;
794 u32 len;
795 int i;
796
797 spin_lock(&ci->i_ceph_lock);
798 dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
799 ci->i_xattrs.version, ci->i_xattrs.index_version);
800
801 if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
802 (ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
803 goto list_xattr;
804 } else {
805 spin_unlock(&ci->i_ceph_lock);
806 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
807 if (err)
808 return err;
809 }
810
811 spin_lock(&ci->i_ceph_lock);
812
813 err = __build_xattrs(inode);
814 if (err < 0)
815 goto out;
816
817list_xattr:
818 /*
819 * Start with virtual dir xattr names (if any) (including
820 * terminating '\0' characters for each).
821 */
822 vir_namelen = ceph_vxattrs_name_size(vxattrs);
823
824 /* adding 1 byte per each variable due to the null termination */
825 namelen = ci->i_xattrs.names_size + ci->i_xattrs.count;
826 err = -ERANGE;
827 if (size && vir_namelen + namelen > size)
828 goto out;
829
830 err = namelen + vir_namelen;
831 if (size == 0)
832 goto out;
833
834 names = __copy_xattr_names(ci, names);
835
836 /* virtual xattr names, too */
837 err = namelen;
838 if (vxattrs) {
839 for (i = 0; vxattrs[i].name; i++) {
840 if (!vxattrs[i].hidden &&
841 !(vxattrs[i].exists_cb &&
842 !vxattrs[i].exists_cb(ci))) {
843 len = sprintf(names, "%s", vxattrs[i].name);
844 names += len + 1;
845 err += len + 1;
846 }
847 }
848 }
849
850out:
851 spin_unlock(&ci->i_ceph_lock);
852 return err;
853}
854
855static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
856 const char *value, size_t size, int flags)
857{
858 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
859 struct inode *inode = dentry->d_inode;
860 struct ceph_inode_info *ci = ceph_inode(inode);
861 struct ceph_mds_request *req;
862 struct ceph_mds_client *mdsc = fsc->mdsc;
863 int err;
864 int i, nr_pages;
865 struct page **pages = NULL;
866 void *kaddr;
867
868 /* copy value into some pages */
869 nr_pages = calc_pages_for(0, size);
870 if (nr_pages) {
871 pages = kmalloc(sizeof(pages[0])*nr_pages, GFP_NOFS);
872 if (!pages)
873 return -ENOMEM;
874 err = -ENOMEM;
875 for (i = 0; i < nr_pages; i++) {
876 pages[i] = __page_cache_alloc(GFP_NOFS);
877 if (!pages[i]) {
878 nr_pages = i;
879 goto out;
880 }
881 kaddr = kmap(pages[i]);
882 memcpy(kaddr, value + i*PAGE_CACHE_SIZE,
883 min(PAGE_CACHE_SIZE, size-i*PAGE_CACHE_SIZE));
884 }
885 }
886
887 dout("setxattr value=%.*s\n", (int)size, value);
888
889 if (!value)
890 flags |= CEPH_XATTR_REMOVE;
891
892 /* do request */
893 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETXATTR,
894 USE_AUTH_MDS);
895 if (IS_ERR(req)) {
896 err = PTR_ERR(req);
897 goto out;
898 }
899 req->r_inode = inode;
900 ihold(inode);
901 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
902 req->r_num_caps = 1;
903 req->r_args.setxattr.flags = cpu_to_le32(flags);
904 req->r_path2 = kstrdup(name, GFP_NOFS);
905
906 req->r_pages = pages;
907 req->r_num_pages = nr_pages;
908 req->r_data_len = size;
909
910 dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
911 err = ceph_mdsc_do_request(mdsc, NULL, req);
912 ceph_mdsc_put_request(req);
913 dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
914
915out:
916 if (pages) {
917 for (i = 0; i < nr_pages; i++)
918 __free_page(pages[i]);
919 kfree(pages);
920 }
921 return err;
922}
923
924int __ceph_setxattr(struct dentry *dentry, const char *name,
925 const void *value, size_t size, int flags)
926{
927 struct inode *inode = dentry->d_inode;
928 struct ceph_vxattr *vxattr;
929 struct ceph_inode_info *ci = ceph_inode(inode);
930 int issued;
931 int err;
932 int dirty = 0;
933 int name_len = strlen(name);
934 int val_len = size;
935 char *newname = NULL;
936 char *newval = NULL;
937 struct ceph_inode_xattr *xattr = NULL;
938 int required_blob_size;
939
940 if (!ceph_is_valid_xattr(name))
941 return -EOPNOTSUPP;
942
943 vxattr = ceph_match_vxattr(inode, name);
944 if (vxattr && vxattr->readonly)
945 return -EOPNOTSUPP;
946
947 /* pass any unhandled ceph.* xattrs through to the MDS */
948 if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
949 goto do_sync_unlocked;
950
951 /* preallocate memory for xattr name, value, index node */
952 err = -ENOMEM;
953 newname = kmemdup(name, name_len + 1, GFP_NOFS);
954 if (!newname)
955 goto out;
956
957 if (val_len) {
958 newval = kmemdup(value, val_len, GFP_NOFS);
959 if (!newval)
960 goto out;
961 }
962
963 xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS);
964 if (!xattr)
965 goto out;
966
967 spin_lock(&ci->i_ceph_lock);
968retry:
969 issued = __ceph_caps_issued(ci, NULL);
970 dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued));
971 if (!(issued & CEPH_CAP_XATTR_EXCL))
972 goto do_sync;
973 __build_xattrs(inode);
974
975 required_blob_size = __get_required_blob_size(ci, name_len, val_len);
976
977 if (!ci->i_xattrs.prealloc_blob ||
978 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
979 struct ceph_buffer *blob;
980
981 spin_unlock(&ci->i_ceph_lock);
982 dout(" preaallocating new blob size=%d\n", required_blob_size);
983 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
984 if (!blob)
985 goto out;
986 spin_lock(&ci->i_ceph_lock);
987 if (ci->i_xattrs.prealloc_blob)
988 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
989 ci->i_xattrs.prealloc_blob = blob;
990 goto retry;
991 }
992
993 err = __set_xattr(ci, newname, name_len, newval, val_len,
994 flags, value ? 1 : -1, &xattr);
995
996 if (!err) {
997 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
998 ci->i_xattrs.dirty = true;
999 inode->i_ctime = CURRENT_TIME;
1000 }
1001
1002 spin_unlock(&ci->i_ceph_lock);
1003 if (dirty)
1004 __mark_inode_dirty(inode, dirty);
1005 return err;
1006
1007do_sync:
1008 spin_unlock(&ci->i_ceph_lock);
1009do_sync_unlocked:
1010 err = ceph_sync_setxattr(dentry, name, value, size, flags);
1011out:
1012 kfree(newname);
1013 kfree(newval);
1014 kfree(xattr);
1015 return err;
1016}
1017
1018int ceph_setxattr(struct dentry *dentry, const char *name,
1019 const void *value, size_t size, int flags)
1020{
1021 if (ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
1022 return -EROFS;
1023
1024 if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
1025 return generic_setxattr(dentry, name, value, size, flags);
1026
1027 return __ceph_setxattr(dentry, name, value, size, flags);
1028}
1029
1030static int ceph_send_removexattr(struct dentry *dentry, const char *name)
1031{
1032 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
1033 struct ceph_mds_client *mdsc = fsc->mdsc;
1034 struct inode *inode = dentry->d_inode;
1035 struct ceph_mds_request *req;
1036 int err;
1037
1038 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RMXATTR,
1039 USE_AUTH_MDS);
1040 if (IS_ERR(req))
1041 return PTR_ERR(req);
1042 req->r_inode = inode;
1043 ihold(inode);
1044 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
1045 req->r_num_caps = 1;
1046 req->r_path2 = kstrdup(name, GFP_NOFS);
1047
1048 err = ceph_mdsc_do_request(mdsc, NULL, req);
1049 ceph_mdsc_put_request(req);
1050 return err;
1051}
1052
1053int __ceph_removexattr(struct dentry *dentry, const char *name)
1054{
1055 struct inode *inode = dentry->d_inode;
1056 struct ceph_vxattr *vxattr;
1057 struct ceph_inode_info *ci = ceph_inode(inode);
1058 int issued;
1059 int err;
1060 int required_blob_size;
1061 int dirty;
1062
1063 if (!ceph_is_valid_xattr(name))
1064 return -EOPNOTSUPP;
1065
1066 vxattr = ceph_match_vxattr(inode, name);
1067 if (vxattr && vxattr->readonly)
1068 return -EOPNOTSUPP;
1069
1070 /* pass any unhandled ceph.* xattrs through to the MDS */
1071 if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
1072 goto do_sync_unlocked;
1073
1074 err = -ENOMEM;
1075 spin_lock(&ci->i_ceph_lock);
1076retry:
1077 issued = __ceph_caps_issued(ci, NULL);
1078 dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued));
1079
1080 if (!(issued & CEPH_CAP_XATTR_EXCL))
1081 goto do_sync;
1082 __build_xattrs(inode);
1083
1084 required_blob_size = __get_required_blob_size(ci, 0, 0);
1085
1086 if (!ci->i_xattrs.prealloc_blob ||
1087 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
1088 struct ceph_buffer *blob;
1089
1090 spin_unlock(&ci->i_ceph_lock);
1091 dout(" preaallocating new blob size=%d\n", required_blob_size);
1092 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
1093 if (!blob)
1094 goto out;
1095 spin_lock(&ci->i_ceph_lock);
1096 if (ci->i_xattrs.prealloc_blob)
1097 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
1098 ci->i_xattrs.prealloc_blob = blob;
1099 goto retry;
1100 }
1101
1102 err = __remove_xattr_by_name(ceph_inode(inode), name);
1103
1104 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
1105 ci->i_xattrs.dirty = true;
1106 inode->i_ctime = CURRENT_TIME;
1107 spin_unlock(&ci->i_ceph_lock);
1108 if (dirty)
1109 __mark_inode_dirty(inode, dirty);
1110 return err;
1111do_sync:
1112 spin_unlock(&ci->i_ceph_lock);
1113do_sync_unlocked:
1114 err = ceph_send_removexattr(dentry, name);
1115out:
1116 return err;
1117}
1118
1119int ceph_removexattr(struct dentry *dentry, const char *name)
1120{
1121 if (ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
1122 return -EROFS;
1123
1124 if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
1125 return generic_removexattr(dentry, name);
1126
1127 return __ceph_removexattr(dentry, name);
1128}
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/ceph/ceph_debug.h>
3#include <linux/ceph/pagelist.h>
4
5#include "super.h"
6#include "mds_client.h"
7
8#include <linux/ceph/decode.h>
9
10#include <linux/xattr.h>
11#include <linux/security.h>
12#include <linux/posix_acl_xattr.h>
13#include <linux/slab.h>
14
15#define XATTR_CEPH_PREFIX "ceph."
16#define XATTR_CEPH_PREFIX_LEN (sizeof (XATTR_CEPH_PREFIX) - 1)
17
18static int __remove_xattr(struct ceph_inode_info *ci,
19 struct ceph_inode_xattr *xattr);
20
21static bool ceph_is_valid_xattr(const char *name)
22{
23 return !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) ||
24 !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) ||
25 !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) ||
26 !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
27}
28
29/*
30 * These define virtual xattrs exposing the recursive directory
31 * statistics and layout metadata.
32 */
33struct ceph_vxattr {
34 char *name;
35 size_t name_size; /* strlen(name) + 1 (for '\0') */
36 ssize_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val,
37 size_t size);
38 bool (*exists_cb)(struct ceph_inode_info *ci);
39 unsigned int flags;
40};
41
42#define VXATTR_FLAG_READONLY (1<<0)
43#define VXATTR_FLAG_HIDDEN (1<<1)
44#define VXATTR_FLAG_RSTAT (1<<2)
45#define VXATTR_FLAG_DIRSTAT (1<<3)
46
47/* layouts */
48
49static bool ceph_vxattrcb_layout_exists(struct ceph_inode_info *ci)
50{
51 struct ceph_file_layout *fl = &ci->i_layout;
52 return (fl->stripe_unit > 0 || fl->stripe_count > 0 ||
53 fl->object_size > 0 || fl->pool_id >= 0 ||
54 rcu_dereference_raw(fl->pool_ns) != NULL);
55}
56
57static ssize_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
58 size_t size)
59{
60 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
61 struct ceph_osd_client *osdc = &fsc->client->osdc;
62 struct ceph_string *pool_ns;
63 s64 pool = ci->i_layout.pool_id;
64 const char *pool_name;
65 const char *ns_field = " pool_namespace=";
66 char buf[128];
67 size_t len, total_len = 0;
68 ssize_t ret;
69
70 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);
71
72 dout("ceph_vxattrcb_layout %p\n", &ci->vfs_inode);
73 down_read(&osdc->lock);
74 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
75 if (pool_name) {
76 len = snprintf(buf, sizeof(buf),
77 "stripe_unit=%u stripe_count=%u object_size=%u pool=",
78 ci->i_layout.stripe_unit, ci->i_layout.stripe_count,
79 ci->i_layout.object_size);
80 total_len = len + strlen(pool_name);
81 } else {
82 len = snprintf(buf, sizeof(buf),
83 "stripe_unit=%u stripe_count=%u object_size=%u pool=%lld",
84 ci->i_layout.stripe_unit, ci->i_layout.stripe_count,
85 ci->i_layout.object_size, pool);
86 total_len = len;
87 }
88
89 if (pool_ns)
90 total_len += strlen(ns_field) + pool_ns->len;
91
92 ret = total_len;
93 if (size >= total_len) {
94 memcpy(val, buf, len);
95 ret = len;
96 if (pool_name) {
97 len = strlen(pool_name);
98 memcpy(val + ret, pool_name, len);
99 ret += len;
100 }
101 if (pool_ns) {
102 len = strlen(ns_field);
103 memcpy(val + ret, ns_field, len);
104 ret += len;
105 memcpy(val + ret, pool_ns->str, pool_ns->len);
106 ret += pool_ns->len;
107 }
108 }
109 up_read(&osdc->lock);
110 ceph_put_string(pool_ns);
111 return ret;
112}
113
114/*
115 * The convention with strings in xattrs is that they should not be NULL
116 * terminated, since we're returning the length with them. snprintf always
117 * NULL terminates however, so call it on a temporary buffer and then memcpy
118 * the result into place.
119 */
120static __printf(3, 4)
121int ceph_fmt_xattr(char *val, size_t size, const char *fmt, ...)
122{
123 int ret;
124 va_list args;
125 char buf[96]; /* NB: reevaluate size if new vxattrs are added */
126
127 va_start(args, fmt);
128 ret = vsnprintf(buf, size ? sizeof(buf) : 0, fmt, args);
129 va_end(args);
130
131 /* Sanity check */
132 if (size && ret + 1 > sizeof(buf)) {
133 WARN_ONCE(true, "Returned length too big (%d)", ret);
134 return -E2BIG;
135 }
136
137 if (ret <= size)
138 memcpy(val, buf, ret);
139 return ret;
140}
141
142static ssize_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci,
143 char *val, size_t size)
144{
145 return ceph_fmt_xattr(val, size, "%u", ci->i_layout.stripe_unit);
146}
147
148static ssize_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci,
149 char *val, size_t size)
150{
151 return ceph_fmt_xattr(val, size, "%u", ci->i_layout.stripe_count);
152}
153
154static ssize_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci,
155 char *val, size_t size)
156{
157 return ceph_fmt_xattr(val, size, "%u", ci->i_layout.object_size);
158}
159
160static ssize_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci,
161 char *val, size_t size)
162{
163 ssize_t ret;
164 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
165 struct ceph_osd_client *osdc = &fsc->client->osdc;
166 s64 pool = ci->i_layout.pool_id;
167 const char *pool_name;
168
169 down_read(&osdc->lock);
170 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
171 if (pool_name) {
172 ret = strlen(pool_name);
173 if (ret <= size)
174 memcpy(val, pool_name, ret);
175 } else {
176 ret = ceph_fmt_xattr(val, size, "%lld", pool);
177 }
178 up_read(&osdc->lock);
179 return ret;
180}
181
182static ssize_t ceph_vxattrcb_layout_pool_namespace(struct ceph_inode_info *ci,
183 char *val, size_t size)
184{
185 ssize_t ret = 0;
186 struct ceph_string *ns = ceph_try_get_string(ci->i_layout.pool_ns);
187
188 if (ns) {
189 ret = ns->len;
190 if (ret <= size)
191 memcpy(val, ns->str, ret);
192 ceph_put_string(ns);
193 }
194 return ret;
195}
196
197/* directories */
198
199static ssize_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val,
200 size_t size)
201{
202 return ceph_fmt_xattr(val, size, "%lld", ci->i_files + ci->i_subdirs);
203}
204
205static ssize_t ceph_vxattrcb_dir_files(struct ceph_inode_info *ci, char *val,
206 size_t size)
207{
208 return ceph_fmt_xattr(val, size, "%lld", ci->i_files);
209}
210
211static ssize_t ceph_vxattrcb_dir_subdirs(struct ceph_inode_info *ci, char *val,
212 size_t size)
213{
214 return ceph_fmt_xattr(val, size, "%lld", ci->i_subdirs);
215}
216
217static ssize_t ceph_vxattrcb_dir_rentries(struct ceph_inode_info *ci, char *val,
218 size_t size)
219{
220 return ceph_fmt_xattr(val, size, "%lld",
221 ci->i_rfiles + ci->i_rsubdirs);
222}
223
224static ssize_t ceph_vxattrcb_dir_rfiles(struct ceph_inode_info *ci, char *val,
225 size_t size)
226{
227 return ceph_fmt_xattr(val, size, "%lld", ci->i_rfiles);
228}
229
230static ssize_t ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info *ci, char *val,
231 size_t size)
232{
233 return ceph_fmt_xattr(val, size, "%lld", ci->i_rsubdirs);
234}
235
236static ssize_t ceph_vxattrcb_dir_rsnaps(struct ceph_inode_info *ci, char *val,
237 size_t size)
238{
239 return ceph_fmt_xattr(val, size, "%lld", ci->i_rsnaps);
240}
241
242static ssize_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val,
243 size_t size)
244{
245 return ceph_fmt_xattr(val, size, "%lld", ci->i_rbytes);
246}
247
248static ssize_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val,
249 size_t size)
250{
251 return ceph_fmt_xattr(val, size, "%lld.%09ld", ci->i_rctime.tv_sec,
252 ci->i_rctime.tv_nsec);
253}
254
255/* dir pin */
256static bool ceph_vxattrcb_dir_pin_exists(struct ceph_inode_info *ci)
257{
258 return ci->i_dir_pin != -ENODATA;
259}
260
261static ssize_t ceph_vxattrcb_dir_pin(struct ceph_inode_info *ci, char *val,
262 size_t size)
263{
264 return ceph_fmt_xattr(val, size, "%d", (int)ci->i_dir_pin);
265}
266
267/* quotas */
268static bool ceph_vxattrcb_quota_exists(struct ceph_inode_info *ci)
269{
270 bool ret = false;
271 spin_lock(&ci->i_ceph_lock);
272 if ((ci->i_max_files || ci->i_max_bytes) &&
273 ci->i_vino.snap == CEPH_NOSNAP &&
274 ci->i_snap_realm &&
275 ci->i_snap_realm->ino == ci->i_vino.ino)
276 ret = true;
277 spin_unlock(&ci->i_ceph_lock);
278 return ret;
279}
280
281static ssize_t ceph_vxattrcb_quota(struct ceph_inode_info *ci, char *val,
282 size_t size)
283{
284 return ceph_fmt_xattr(val, size, "max_bytes=%llu max_files=%llu",
285 ci->i_max_bytes, ci->i_max_files);
286}
287
288static ssize_t ceph_vxattrcb_quota_max_bytes(struct ceph_inode_info *ci,
289 char *val, size_t size)
290{
291 return ceph_fmt_xattr(val, size, "%llu", ci->i_max_bytes);
292}
293
294static ssize_t ceph_vxattrcb_quota_max_files(struct ceph_inode_info *ci,
295 char *val, size_t size)
296{
297 return ceph_fmt_xattr(val, size, "%llu", ci->i_max_files);
298}
299
300/* snapshots */
301static bool ceph_vxattrcb_snap_btime_exists(struct ceph_inode_info *ci)
302{
303 return (ci->i_snap_btime.tv_sec != 0 || ci->i_snap_btime.tv_nsec != 0);
304}
305
306static ssize_t ceph_vxattrcb_snap_btime(struct ceph_inode_info *ci, char *val,
307 size_t size)
308{
309 return ceph_fmt_xattr(val, size, "%lld.%09ld", ci->i_snap_btime.tv_sec,
310 ci->i_snap_btime.tv_nsec);
311}
312
313static ssize_t ceph_vxattrcb_cluster_fsid(struct ceph_inode_info *ci,
314 char *val, size_t size)
315{
316 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
317
318 return ceph_fmt_xattr(val, size, "%pU", &fsc->client->fsid);
319}
320
321static ssize_t ceph_vxattrcb_client_id(struct ceph_inode_info *ci,
322 char *val, size_t size)
323{
324 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
325
326 return ceph_fmt_xattr(val, size, "client%lld",
327 ceph_client_gid(fsc->client));
328}
329
330static ssize_t ceph_vxattrcb_caps(struct ceph_inode_info *ci, char *val,
331 size_t size)
332{
333 int issued;
334
335 spin_lock(&ci->i_ceph_lock);
336 issued = __ceph_caps_issued(ci, NULL);
337 spin_unlock(&ci->i_ceph_lock);
338
339 return ceph_fmt_xattr(val, size, "%s/0x%x",
340 ceph_cap_string(issued), issued);
341}
342
343#define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name
344#define CEPH_XATTR_NAME2(_type, _name, _name2) \
345 XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
346
347#define XATTR_NAME_CEPH(_type, _name, _flags) \
348 { \
349 .name = CEPH_XATTR_NAME(_type, _name), \
350 .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \
351 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
352 .exists_cb = NULL, \
353 .flags = (VXATTR_FLAG_READONLY | _flags), \
354 }
355#define XATTR_RSTAT_FIELD(_type, _name) \
356 XATTR_NAME_CEPH(_type, _name, VXATTR_FLAG_RSTAT)
357#define XATTR_LAYOUT_FIELD(_type, _name, _field) \
358 { \
359 .name = CEPH_XATTR_NAME2(_type, _name, _field), \
360 .name_size = sizeof (CEPH_XATTR_NAME2(_type, _name, _field)), \
361 .getxattr_cb = ceph_vxattrcb_ ## _name ## _ ## _field, \
362 .exists_cb = ceph_vxattrcb_layout_exists, \
363 .flags = VXATTR_FLAG_HIDDEN, \
364 }
365#define XATTR_QUOTA_FIELD(_type, _name) \
366 { \
367 .name = CEPH_XATTR_NAME(_type, _name), \
368 .name_size = sizeof(CEPH_XATTR_NAME(_type, _name)), \
369 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
370 .exists_cb = ceph_vxattrcb_quota_exists, \
371 .flags = VXATTR_FLAG_HIDDEN, \
372 }
373
374static struct ceph_vxattr ceph_dir_vxattrs[] = {
375 {
376 .name = "ceph.dir.layout",
377 .name_size = sizeof("ceph.dir.layout"),
378 .getxattr_cb = ceph_vxattrcb_layout,
379 .exists_cb = ceph_vxattrcb_layout_exists,
380 .flags = VXATTR_FLAG_HIDDEN,
381 },
382 XATTR_LAYOUT_FIELD(dir, layout, stripe_unit),
383 XATTR_LAYOUT_FIELD(dir, layout, stripe_count),
384 XATTR_LAYOUT_FIELD(dir, layout, object_size),
385 XATTR_LAYOUT_FIELD(dir, layout, pool),
386 XATTR_LAYOUT_FIELD(dir, layout, pool_namespace),
387 XATTR_NAME_CEPH(dir, entries, VXATTR_FLAG_DIRSTAT),
388 XATTR_NAME_CEPH(dir, files, VXATTR_FLAG_DIRSTAT),
389 XATTR_NAME_CEPH(dir, subdirs, VXATTR_FLAG_DIRSTAT),
390 XATTR_RSTAT_FIELD(dir, rentries),
391 XATTR_RSTAT_FIELD(dir, rfiles),
392 XATTR_RSTAT_FIELD(dir, rsubdirs),
393 XATTR_RSTAT_FIELD(dir, rsnaps),
394 XATTR_RSTAT_FIELD(dir, rbytes),
395 XATTR_RSTAT_FIELD(dir, rctime),
396 {
397 .name = "ceph.dir.pin",
398 .name_size = sizeof("ceph.dir.pin"),
399 .getxattr_cb = ceph_vxattrcb_dir_pin,
400 .exists_cb = ceph_vxattrcb_dir_pin_exists,
401 .flags = VXATTR_FLAG_HIDDEN,
402 },
403 {
404 .name = "ceph.quota",
405 .name_size = sizeof("ceph.quota"),
406 .getxattr_cb = ceph_vxattrcb_quota,
407 .exists_cb = ceph_vxattrcb_quota_exists,
408 .flags = VXATTR_FLAG_HIDDEN,
409 },
410 XATTR_QUOTA_FIELD(quota, max_bytes),
411 XATTR_QUOTA_FIELD(quota, max_files),
412 {
413 .name = "ceph.snap.btime",
414 .name_size = sizeof("ceph.snap.btime"),
415 .getxattr_cb = ceph_vxattrcb_snap_btime,
416 .exists_cb = ceph_vxattrcb_snap_btime_exists,
417 .flags = VXATTR_FLAG_READONLY,
418 },
419 {
420 .name = "ceph.caps",
421 .name_size = sizeof("ceph.caps"),
422 .getxattr_cb = ceph_vxattrcb_caps,
423 .exists_cb = NULL,
424 .flags = VXATTR_FLAG_HIDDEN,
425 },
426 { .name = NULL, 0 } /* Required table terminator */
427};
428
429/* files */
430
431static struct ceph_vxattr ceph_file_vxattrs[] = {
432 {
433 .name = "ceph.file.layout",
434 .name_size = sizeof("ceph.file.layout"),
435 .getxattr_cb = ceph_vxattrcb_layout,
436 .exists_cb = ceph_vxattrcb_layout_exists,
437 .flags = VXATTR_FLAG_HIDDEN,
438 },
439 XATTR_LAYOUT_FIELD(file, layout, stripe_unit),
440 XATTR_LAYOUT_FIELD(file, layout, stripe_count),
441 XATTR_LAYOUT_FIELD(file, layout, object_size),
442 XATTR_LAYOUT_FIELD(file, layout, pool),
443 XATTR_LAYOUT_FIELD(file, layout, pool_namespace),
444 {
445 .name = "ceph.snap.btime",
446 .name_size = sizeof("ceph.snap.btime"),
447 .getxattr_cb = ceph_vxattrcb_snap_btime,
448 .exists_cb = ceph_vxattrcb_snap_btime_exists,
449 .flags = VXATTR_FLAG_READONLY,
450 },
451 {
452 .name = "ceph.caps",
453 .name_size = sizeof("ceph.caps"),
454 .getxattr_cb = ceph_vxattrcb_caps,
455 .exists_cb = NULL,
456 .flags = VXATTR_FLAG_HIDDEN,
457 },
458 { .name = NULL, 0 } /* Required table terminator */
459};
460
461static struct ceph_vxattr ceph_common_vxattrs[] = {
462 {
463 .name = "ceph.cluster_fsid",
464 .name_size = sizeof("ceph.cluster_fsid"),
465 .getxattr_cb = ceph_vxattrcb_cluster_fsid,
466 .exists_cb = NULL,
467 .flags = VXATTR_FLAG_READONLY,
468 },
469 {
470 .name = "ceph.client_id",
471 .name_size = sizeof("ceph.client_id"),
472 .getxattr_cb = ceph_vxattrcb_client_id,
473 .exists_cb = NULL,
474 .flags = VXATTR_FLAG_READONLY,
475 },
476 { .name = NULL, 0 } /* Required table terminator */
477};
478
479static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode)
480{
481 if (S_ISDIR(inode->i_mode))
482 return ceph_dir_vxattrs;
483 else if (S_ISREG(inode->i_mode))
484 return ceph_file_vxattrs;
485 return NULL;
486}
487
488static struct ceph_vxattr *ceph_match_vxattr(struct inode *inode,
489 const char *name)
490{
491 struct ceph_vxattr *vxattr = ceph_inode_vxattrs(inode);
492
493 if (vxattr) {
494 while (vxattr->name) {
495 if (!strcmp(vxattr->name, name))
496 return vxattr;
497 vxattr++;
498 }
499 }
500
501 vxattr = ceph_common_vxattrs;
502 while (vxattr->name) {
503 if (!strcmp(vxattr->name, name))
504 return vxattr;
505 vxattr++;
506 }
507
508 return NULL;
509}
510
511static int __set_xattr(struct ceph_inode_info *ci,
512 const char *name, int name_len,
513 const char *val, int val_len,
514 int flags, int update_xattr,
515 struct ceph_inode_xattr **newxattr)
516{
517 struct rb_node **p;
518 struct rb_node *parent = NULL;
519 struct ceph_inode_xattr *xattr = NULL;
520 int c;
521 int new = 0;
522
523 p = &ci->i_xattrs.index.rb_node;
524 while (*p) {
525 parent = *p;
526 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
527 c = strncmp(name, xattr->name, min(name_len, xattr->name_len));
528 if (c < 0)
529 p = &(*p)->rb_left;
530 else if (c > 0)
531 p = &(*p)->rb_right;
532 else {
533 if (name_len == xattr->name_len)
534 break;
535 else if (name_len < xattr->name_len)
536 p = &(*p)->rb_left;
537 else
538 p = &(*p)->rb_right;
539 }
540 xattr = NULL;
541 }
542
543 if (update_xattr) {
544 int err = 0;
545
546 if (xattr && (flags & XATTR_CREATE))
547 err = -EEXIST;
548 else if (!xattr && (flags & XATTR_REPLACE))
549 err = -ENODATA;
550 if (err) {
551 kfree(name);
552 kfree(val);
553 kfree(*newxattr);
554 return err;
555 }
556 if (update_xattr < 0) {
557 if (xattr)
558 __remove_xattr(ci, xattr);
559 kfree(name);
560 kfree(*newxattr);
561 return 0;
562 }
563 }
564
565 if (!xattr) {
566 new = 1;
567 xattr = *newxattr;
568 xattr->name = name;
569 xattr->name_len = name_len;
570 xattr->should_free_name = update_xattr;
571
572 ci->i_xattrs.count++;
573 dout("__set_xattr count=%d\n", ci->i_xattrs.count);
574 } else {
575 kfree(*newxattr);
576 *newxattr = NULL;
577 if (xattr->should_free_val)
578 kfree(xattr->val);
579
580 if (update_xattr) {
581 kfree(name);
582 name = xattr->name;
583 }
584 ci->i_xattrs.names_size -= xattr->name_len;
585 ci->i_xattrs.vals_size -= xattr->val_len;
586 }
587 ci->i_xattrs.names_size += name_len;
588 ci->i_xattrs.vals_size += val_len;
589 if (val)
590 xattr->val = val;
591 else
592 xattr->val = "";
593
594 xattr->val_len = val_len;
595 xattr->dirty = update_xattr;
596 xattr->should_free_val = (val && update_xattr);
597
598 if (new) {
599 rb_link_node(&xattr->node, parent, p);
600 rb_insert_color(&xattr->node, &ci->i_xattrs.index);
601 dout("__set_xattr_val p=%p\n", p);
602 }
603
604 dout("__set_xattr_val added %llx.%llx xattr %p %.*s=%.*s\n",
605 ceph_vinop(&ci->vfs_inode), xattr, name_len, name, val_len, val);
606
607 return 0;
608}
609
610static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci,
611 const char *name)
612{
613 struct rb_node **p;
614 struct rb_node *parent = NULL;
615 struct ceph_inode_xattr *xattr = NULL;
616 int name_len = strlen(name);
617 int c;
618
619 p = &ci->i_xattrs.index.rb_node;
620 while (*p) {
621 parent = *p;
622 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
623 c = strncmp(name, xattr->name, xattr->name_len);
624 if (c == 0 && name_len > xattr->name_len)
625 c = 1;
626 if (c < 0)
627 p = &(*p)->rb_left;
628 else if (c > 0)
629 p = &(*p)->rb_right;
630 else {
631 dout("__get_xattr %s: found %.*s\n", name,
632 xattr->val_len, xattr->val);
633 return xattr;
634 }
635 }
636
637 dout("__get_xattr %s: not found\n", name);
638
639 return NULL;
640}
641
642static void __free_xattr(struct ceph_inode_xattr *xattr)
643{
644 BUG_ON(!xattr);
645
646 if (xattr->should_free_name)
647 kfree(xattr->name);
648 if (xattr->should_free_val)
649 kfree(xattr->val);
650
651 kfree(xattr);
652}
653
654static int __remove_xattr(struct ceph_inode_info *ci,
655 struct ceph_inode_xattr *xattr)
656{
657 if (!xattr)
658 return -ENODATA;
659
660 rb_erase(&xattr->node, &ci->i_xattrs.index);
661
662 if (xattr->should_free_name)
663 kfree(xattr->name);
664 if (xattr->should_free_val)
665 kfree(xattr->val);
666
667 ci->i_xattrs.names_size -= xattr->name_len;
668 ci->i_xattrs.vals_size -= xattr->val_len;
669 ci->i_xattrs.count--;
670 kfree(xattr);
671
672 return 0;
673}
674
675static char *__copy_xattr_names(struct ceph_inode_info *ci,
676 char *dest)
677{
678 struct rb_node *p;
679 struct ceph_inode_xattr *xattr = NULL;
680
681 p = rb_first(&ci->i_xattrs.index);
682 dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count);
683
684 while (p) {
685 xattr = rb_entry(p, struct ceph_inode_xattr, node);
686 memcpy(dest, xattr->name, xattr->name_len);
687 dest[xattr->name_len] = '\0';
688
689 dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name,
690 xattr->name_len, ci->i_xattrs.names_size);
691
692 dest += xattr->name_len + 1;
693 p = rb_next(p);
694 }
695
696 return dest;
697}
698
699void __ceph_destroy_xattrs(struct ceph_inode_info *ci)
700{
701 struct rb_node *p, *tmp;
702 struct ceph_inode_xattr *xattr = NULL;
703
704 p = rb_first(&ci->i_xattrs.index);
705
706 dout("__ceph_destroy_xattrs p=%p\n", p);
707
708 while (p) {
709 xattr = rb_entry(p, struct ceph_inode_xattr, node);
710 tmp = p;
711 p = rb_next(tmp);
712 dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p,
713 xattr->name_len, xattr->name);
714 rb_erase(tmp, &ci->i_xattrs.index);
715
716 __free_xattr(xattr);
717 }
718
719 ci->i_xattrs.names_size = 0;
720 ci->i_xattrs.vals_size = 0;
721 ci->i_xattrs.index_version = 0;
722 ci->i_xattrs.count = 0;
723 ci->i_xattrs.index = RB_ROOT;
724}
725
726static int __build_xattrs(struct inode *inode)
727 __releases(ci->i_ceph_lock)
728 __acquires(ci->i_ceph_lock)
729{
730 u32 namelen;
731 u32 numattr = 0;
732 void *p, *end;
733 u32 len;
734 const char *name, *val;
735 struct ceph_inode_info *ci = ceph_inode(inode);
736 u64 xattr_version;
737 struct ceph_inode_xattr **xattrs = NULL;
738 int err = 0;
739 int i;
740
741 dout("__build_xattrs() len=%d\n",
742 ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0);
743
744 if (ci->i_xattrs.index_version >= ci->i_xattrs.version)
745 return 0; /* already built */
746
747 __ceph_destroy_xattrs(ci);
748
749start:
750 /* updated internal xattr rb tree */
751 if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) {
752 p = ci->i_xattrs.blob->vec.iov_base;
753 end = p + ci->i_xattrs.blob->vec.iov_len;
754 ceph_decode_32_safe(&p, end, numattr, bad);
755 xattr_version = ci->i_xattrs.version;
756 spin_unlock(&ci->i_ceph_lock);
757
758 xattrs = kcalloc(numattr, sizeof(struct ceph_inode_xattr *),
759 GFP_NOFS);
760 err = -ENOMEM;
761 if (!xattrs)
762 goto bad_lock;
763
764 for (i = 0; i < numattr; i++) {
765 xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr),
766 GFP_NOFS);
767 if (!xattrs[i])
768 goto bad_lock;
769 }
770
771 spin_lock(&ci->i_ceph_lock);
772 if (ci->i_xattrs.version != xattr_version) {
773 /* lost a race, retry */
774 for (i = 0; i < numattr; i++)
775 kfree(xattrs[i]);
776 kfree(xattrs);
777 xattrs = NULL;
778 goto start;
779 }
780 err = -EIO;
781 while (numattr--) {
782 ceph_decode_32_safe(&p, end, len, bad);
783 namelen = len;
784 name = p;
785 p += len;
786 ceph_decode_32_safe(&p, end, len, bad);
787 val = p;
788 p += len;
789
790 err = __set_xattr(ci, name, namelen, val, len,
791 0, 0, &xattrs[numattr]);
792
793 if (err < 0)
794 goto bad;
795 }
796 kfree(xattrs);
797 }
798 ci->i_xattrs.index_version = ci->i_xattrs.version;
799 ci->i_xattrs.dirty = false;
800
801 return err;
802bad_lock:
803 spin_lock(&ci->i_ceph_lock);
804bad:
805 if (xattrs) {
806 for (i = 0; i < numattr; i++)
807 kfree(xattrs[i]);
808 kfree(xattrs);
809 }
810 ci->i_xattrs.names_size = 0;
811 return err;
812}
813
814static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size,
815 int val_size)
816{
817 /*
818 * 4 bytes for the length, and additional 4 bytes per each xattr name,
819 * 4 bytes per each value
820 */
821 int size = 4 + ci->i_xattrs.count*(4 + 4) +
822 ci->i_xattrs.names_size +
823 ci->i_xattrs.vals_size;
824 dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n",
825 ci->i_xattrs.count, ci->i_xattrs.names_size,
826 ci->i_xattrs.vals_size);
827
828 if (name_size)
829 size += 4 + 4 + name_size + val_size;
830
831 return size;
832}
833
834/*
835 * If there are dirty xattrs, reencode xattrs into the prealloc_blob
836 * and swap into place. It returns the old i_xattrs.blob (or NULL) so
837 * that it can be freed by the caller as the i_ceph_lock is likely to be
838 * held.
839 */
840struct ceph_buffer *__ceph_build_xattrs_blob(struct ceph_inode_info *ci)
841{
842 struct rb_node *p;
843 struct ceph_inode_xattr *xattr = NULL;
844 struct ceph_buffer *old_blob = NULL;
845 void *dest;
846
847 dout("__build_xattrs_blob %p\n", &ci->vfs_inode);
848 if (ci->i_xattrs.dirty) {
849 int need = __get_required_blob_size(ci, 0, 0);
850
851 BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len);
852
853 p = rb_first(&ci->i_xattrs.index);
854 dest = ci->i_xattrs.prealloc_blob->vec.iov_base;
855
856 ceph_encode_32(&dest, ci->i_xattrs.count);
857 while (p) {
858 xattr = rb_entry(p, struct ceph_inode_xattr, node);
859
860 ceph_encode_32(&dest, xattr->name_len);
861 memcpy(dest, xattr->name, xattr->name_len);
862 dest += xattr->name_len;
863 ceph_encode_32(&dest, xattr->val_len);
864 memcpy(dest, xattr->val, xattr->val_len);
865 dest += xattr->val_len;
866
867 p = rb_next(p);
868 }
869
870 /* adjust buffer len; it may be larger than we need */
871 ci->i_xattrs.prealloc_blob->vec.iov_len =
872 dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
873
874 if (ci->i_xattrs.blob)
875 old_blob = ci->i_xattrs.blob;
876 ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
877 ci->i_xattrs.prealloc_blob = NULL;
878 ci->i_xattrs.dirty = false;
879 ci->i_xattrs.version++;
880 }
881
882 return old_blob;
883}
884
885static inline int __get_request_mask(struct inode *in) {
886 struct ceph_mds_request *req = current->journal_info;
887 int mask = 0;
888 if (req && req->r_target_inode == in) {
889 if (req->r_op == CEPH_MDS_OP_LOOKUP ||
890 req->r_op == CEPH_MDS_OP_LOOKUPINO ||
891 req->r_op == CEPH_MDS_OP_LOOKUPPARENT ||
892 req->r_op == CEPH_MDS_OP_GETATTR) {
893 mask = le32_to_cpu(req->r_args.getattr.mask);
894 } else if (req->r_op == CEPH_MDS_OP_OPEN ||
895 req->r_op == CEPH_MDS_OP_CREATE) {
896 mask = le32_to_cpu(req->r_args.open.mask);
897 }
898 }
899 return mask;
900}
901
902ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
903 size_t size)
904{
905 struct ceph_inode_info *ci = ceph_inode(inode);
906 struct ceph_inode_xattr *xattr;
907 struct ceph_vxattr *vxattr = NULL;
908 int req_mask;
909 ssize_t err;
910
911 /* let's see if a virtual xattr was requested */
912 vxattr = ceph_match_vxattr(inode, name);
913 if (vxattr) {
914 int mask = 0;
915 if (vxattr->flags & VXATTR_FLAG_RSTAT)
916 mask |= CEPH_STAT_RSTAT;
917 if (vxattr->flags & VXATTR_FLAG_DIRSTAT)
918 mask |= CEPH_CAP_FILE_SHARED;
919 err = ceph_do_getattr(inode, mask, true);
920 if (err)
921 return err;
922 err = -ENODATA;
923 if (!(vxattr->exists_cb && !vxattr->exists_cb(ci))) {
924 err = vxattr->getxattr_cb(ci, value, size);
925 if (size && size < err)
926 err = -ERANGE;
927 }
928 return err;
929 }
930
931 req_mask = __get_request_mask(inode);
932
933 spin_lock(&ci->i_ceph_lock);
934 dout("getxattr %p name '%s' ver=%lld index_ver=%lld\n", inode, name,
935 ci->i_xattrs.version, ci->i_xattrs.index_version);
936
937 if (ci->i_xattrs.version == 0 ||
938 !((req_mask & CEPH_CAP_XATTR_SHARED) ||
939 __ceph_caps_issued_mask_metric(ci, CEPH_CAP_XATTR_SHARED, 1))) {
940 spin_unlock(&ci->i_ceph_lock);
941
942 /* security module gets xattr while filling trace */
943 if (current->journal_info) {
944 pr_warn_ratelimited("sync getxattr %p "
945 "during filling trace\n", inode);
946 return -EBUSY;
947 }
948
949 /* get xattrs from mds (if we don't already have them) */
950 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
951 if (err)
952 return err;
953 spin_lock(&ci->i_ceph_lock);
954 }
955
956 err = __build_xattrs(inode);
957 if (err < 0)
958 goto out;
959
960 err = -ENODATA; /* == ENOATTR */
961 xattr = __get_xattr(ci, name);
962 if (!xattr)
963 goto out;
964
965 err = -ERANGE;
966 if (size && size < xattr->val_len)
967 goto out;
968
969 err = xattr->val_len;
970 if (size == 0)
971 goto out;
972
973 memcpy(value, xattr->val, xattr->val_len);
974
975 if (current->journal_info &&
976 !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) &&
977 security_ismaclabel(name + XATTR_SECURITY_PREFIX_LEN))
978 ci->i_ceph_flags |= CEPH_I_SEC_INITED;
979out:
980 spin_unlock(&ci->i_ceph_lock);
981 return err;
982}
983
984ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
985{
986 struct inode *inode = d_inode(dentry);
987 struct ceph_inode_info *ci = ceph_inode(inode);
988 bool len_only = (size == 0);
989 u32 namelen;
990 int err;
991
992 spin_lock(&ci->i_ceph_lock);
993 dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
994 ci->i_xattrs.version, ci->i_xattrs.index_version);
995
996 if (ci->i_xattrs.version == 0 ||
997 !__ceph_caps_issued_mask_metric(ci, CEPH_CAP_XATTR_SHARED, 1)) {
998 spin_unlock(&ci->i_ceph_lock);
999 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
1000 if (err)
1001 return err;
1002 spin_lock(&ci->i_ceph_lock);
1003 }
1004
1005 err = __build_xattrs(inode);
1006 if (err < 0)
1007 goto out;
1008
1009 /* add 1 byte for each xattr due to the null termination */
1010 namelen = ci->i_xattrs.names_size + ci->i_xattrs.count;
1011 if (!len_only) {
1012 if (namelen > size) {
1013 err = -ERANGE;
1014 goto out;
1015 }
1016 names = __copy_xattr_names(ci, names);
1017 size -= namelen;
1018 }
1019 err = namelen;
1020out:
1021 spin_unlock(&ci->i_ceph_lock);
1022 return err;
1023}
1024
1025static int ceph_sync_setxattr(struct inode *inode, const char *name,
1026 const char *value, size_t size, int flags)
1027{
1028 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1029 struct ceph_inode_info *ci = ceph_inode(inode);
1030 struct ceph_mds_request *req;
1031 struct ceph_mds_client *mdsc = fsc->mdsc;
1032 struct ceph_osd_client *osdc = &fsc->client->osdc;
1033 struct ceph_pagelist *pagelist = NULL;
1034 int op = CEPH_MDS_OP_SETXATTR;
1035 int err;
1036
1037 if (size > 0) {
1038 /* copy value into pagelist */
1039 pagelist = ceph_pagelist_alloc(GFP_NOFS);
1040 if (!pagelist)
1041 return -ENOMEM;
1042
1043 err = ceph_pagelist_append(pagelist, value, size);
1044 if (err)
1045 goto out;
1046 } else if (!value) {
1047 if (flags & CEPH_XATTR_REPLACE)
1048 op = CEPH_MDS_OP_RMXATTR;
1049 else
1050 flags |= CEPH_XATTR_REMOVE;
1051 }
1052
1053 dout("setxattr value=%.*s\n", (int)size, value);
1054
1055 /* do request */
1056 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
1057 if (IS_ERR(req)) {
1058 err = PTR_ERR(req);
1059 goto out;
1060 }
1061
1062 req->r_path2 = kstrdup(name, GFP_NOFS);
1063 if (!req->r_path2) {
1064 ceph_mdsc_put_request(req);
1065 err = -ENOMEM;
1066 goto out;
1067 }
1068
1069 if (op == CEPH_MDS_OP_SETXATTR) {
1070 req->r_args.setxattr.flags = cpu_to_le32(flags);
1071 req->r_args.setxattr.osdmap_epoch =
1072 cpu_to_le32(osdc->osdmap->epoch);
1073 req->r_pagelist = pagelist;
1074 pagelist = NULL;
1075 }
1076
1077 req->r_inode = inode;
1078 ihold(inode);
1079 req->r_num_caps = 1;
1080 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
1081
1082 dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
1083 err = ceph_mdsc_do_request(mdsc, NULL, req);
1084 ceph_mdsc_put_request(req);
1085 dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
1086
1087out:
1088 if (pagelist)
1089 ceph_pagelist_release(pagelist);
1090 return err;
1091}
1092
1093int __ceph_setxattr(struct inode *inode, const char *name,
1094 const void *value, size_t size, int flags)
1095{
1096 struct ceph_vxattr *vxattr;
1097 struct ceph_inode_info *ci = ceph_inode(inode);
1098 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1099 struct ceph_cap_flush *prealloc_cf = NULL;
1100 struct ceph_buffer *old_blob = NULL;
1101 int issued;
1102 int err;
1103 int dirty = 0;
1104 int name_len = strlen(name);
1105 int val_len = size;
1106 char *newname = NULL;
1107 char *newval = NULL;
1108 struct ceph_inode_xattr *xattr = NULL;
1109 int required_blob_size;
1110 bool check_realm = false;
1111 bool lock_snap_rwsem = false;
1112
1113 if (ceph_snap(inode) != CEPH_NOSNAP)
1114 return -EROFS;
1115
1116 vxattr = ceph_match_vxattr(inode, name);
1117 if (vxattr) {
1118 if (vxattr->flags & VXATTR_FLAG_READONLY)
1119 return -EOPNOTSUPP;
1120 if (value && !strncmp(vxattr->name, "ceph.quota", 10))
1121 check_realm = true;
1122 }
1123
1124 /* pass any unhandled ceph.* xattrs through to the MDS */
1125 if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
1126 goto do_sync_unlocked;
1127
1128 /* preallocate memory for xattr name, value, index node */
1129 err = -ENOMEM;
1130 newname = kmemdup(name, name_len + 1, GFP_NOFS);
1131 if (!newname)
1132 goto out;
1133
1134 if (val_len) {
1135 newval = kmemdup(value, val_len, GFP_NOFS);
1136 if (!newval)
1137 goto out;
1138 }
1139
1140 xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS);
1141 if (!xattr)
1142 goto out;
1143
1144 prealloc_cf = ceph_alloc_cap_flush();
1145 if (!prealloc_cf)
1146 goto out;
1147
1148 spin_lock(&ci->i_ceph_lock);
1149retry:
1150 issued = __ceph_caps_issued(ci, NULL);
1151 if (ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))
1152 goto do_sync;
1153
1154 if (!lock_snap_rwsem && !ci->i_head_snapc) {
1155 lock_snap_rwsem = true;
1156 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1157 spin_unlock(&ci->i_ceph_lock);
1158 down_read(&mdsc->snap_rwsem);
1159 spin_lock(&ci->i_ceph_lock);
1160 goto retry;
1161 }
1162 }
1163
1164 dout("setxattr %p name '%s' issued %s\n", inode, name,
1165 ceph_cap_string(issued));
1166 __build_xattrs(inode);
1167
1168 required_blob_size = __get_required_blob_size(ci, name_len, val_len);
1169
1170 if (!ci->i_xattrs.prealloc_blob ||
1171 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
1172 struct ceph_buffer *blob;
1173
1174 spin_unlock(&ci->i_ceph_lock);
1175 ceph_buffer_put(old_blob); /* Shouldn't be required */
1176 dout(" pre-allocating new blob size=%d\n", required_blob_size);
1177 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
1178 if (!blob)
1179 goto do_sync_unlocked;
1180 spin_lock(&ci->i_ceph_lock);
1181 /* prealloc_blob can't be released while holding i_ceph_lock */
1182 if (ci->i_xattrs.prealloc_blob)
1183 old_blob = ci->i_xattrs.prealloc_blob;
1184 ci->i_xattrs.prealloc_blob = blob;
1185 goto retry;
1186 }
1187
1188 err = __set_xattr(ci, newname, name_len, newval, val_len,
1189 flags, value ? 1 : -1, &xattr);
1190
1191 if (!err) {
1192 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL,
1193 &prealloc_cf);
1194 ci->i_xattrs.dirty = true;
1195 inode->i_ctime = current_time(inode);
1196 }
1197
1198 spin_unlock(&ci->i_ceph_lock);
1199 ceph_buffer_put(old_blob);
1200 if (lock_snap_rwsem)
1201 up_read(&mdsc->snap_rwsem);
1202 if (dirty)
1203 __mark_inode_dirty(inode, dirty);
1204 ceph_free_cap_flush(prealloc_cf);
1205 return err;
1206
1207do_sync:
1208 spin_unlock(&ci->i_ceph_lock);
1209do_sync_unlocked:
1210 if (lock_snap_rwsem)
1211 up_read(&mdsc->snap_rwsem);
1212
1213 /* security module set xattr while filling trace */
1214 if (current->journal_info) {
1215 pr_warn_ratelimited("sync setxattr %p "
1216 "during filling trace\n", inode);
1217 err = -EBUSY;
1218 } else {
1219 err = ceph_sync_setxattr(inode, name, value, size, flags);
1220 if (err >= 0 && check_realm) {
1221 /* check if snaprealm was created for quota inode */
1222 spin_lock(&ci->i_ceph_lock);
1223 if ((ci->i_max_files || ci->i_max_bytes) &&
1224 !(ci->i_snap_realm &&
1225 ci->i_snap_realm->ino == ci->i_vino.ino))
1226 err = -EOPNOTSUPP;
1227 spin_unlock(&ci->i_ceph_lock);
1228 }
1229 }
1230out:
1231 ceph_free_cap_flush(prealloc_cf);
1232 kfree(newname);
1233 kfree(newval);
1234 kfree(xattr);
1235 return err;
1236}
1237
1238static int ceph_get_xattr_handler(const struct xattr_handler *handler,
1239 struct dentry *dentry, struct inode *inode,
1240 const char *name, void *value, size_t size)
1241{
1242 if (!ceph_is_valid_xattr(name))
1243 return -EOPNOTSUPP;
1244 return __ceph_getxattr(inode, name, value, size);
1245}
1246
1247static int ceph_set_xattr_handler(const struct xattr_handler *handler,
1248 struct user_namespace *mnt_userns,
1249 struct dentry *unused, struct inode *inode,
1250 const char *name, const void *value,
1251 size_t size, int flags)
1252{
1253 if (!ceph_is_valid_xattr(name))
1254 return -EOPNOTSUPP;
1255 return __ceph_setxattr(inode, name, value, size, flags);
1256}
1257
1258static const struct xattr_handler ceph_other_xattr_handler = {
1259 .prefix = "", /* match any name => handlers called with full name */
1260 .get = ceph_get_xattr_handler,
1261 .set = ceph_set_xattr_handler,
1262};
1263
1264#ifdef CONFIG_SECURITY
1265bool ceph_security_xattr_wanted(struct inode *in)
1266{
1267 return in->i_security != NULL;
1268}
1269
1270bool ceph_security_xattr_deadlock(struct inode *in)
1271{
1272 struct ceph_inode_info *ci;
1273 bool ret;
1274 if (!in->i_security)
1275 return false;
1276 ci = ceph_inode(in);
1277 spin_lock(&ci->i_ceph_lock);
1278 ret = !(ci->i_ceph_flags & CEPH_I_SEC_INITED) &&
1279 !(ci->i_xattrs.version > 0 &&
1280 __ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0));
1281 spin_unlock(&ci->i_ceph_lock);
1282 return ret;
1283}
1284
1285#ifdef CONFIG_CEPH_FS_SECURITY_LABEL
1286int ceph_security_init_secctx(struct dentry *dentry, umode_t mode,
1287 struct ceph_acl_sec_ctx *as_ctx)
1288{
1289 struct ceph_pagelist *pagelist = as_ctx->pagelist;
1290 const char *name;
1291 size_t name_len;
1292 int err;
1293
1294 err = security_dentry_init_security(dentry, mode, &dentry->d_name,
1295 &as_ctx->sec_ctx,
1296 &as_ctx->sec_ctxlen);
1297 if (err < 0) {
1298 WARN_ON_ONCE(err != -EOPNOTSUPP);
1299 err = 0; /* do nothing */
1300 goto out;
1301 }
1302
1303 err = -ENOMEM;
1304 if (!pagelist) {
1305 pagelist = ceph_pagelist_alloc(GFP_KERNEL);
1306 if (!pagelist)
1307 goto out;
1308 err = ceph_pagelist_reserve(pagelist, PAGE_SIZE);
1309 if (err)
1310 goto out;
1311 ceph_pagelist_encode_32(pagelist, 1);
1312 }
1313
1314 /*
1315 * FIXME: Make security_dentry_init_security() generic. Currently
1316 * It only supports single security module and only selinux has
1317 * dentry_init_security hook.
1318 */
1319 name = XATTR_NAME_SELINUX;
1320 name_len = strlen(name);
1321 err = ceph_pagelist_reserve(pagelist,
1322 4 * 2 + name_len + as_ctx->sec_ctxlen);
1323 if (err)
1324 goto out;
1325
1326 if (as_ctx->pagelist) {
1327 /* update count of KV pairs */
1328 BUG_ON(pagelist->length <= sizeof(__le32));
1329 if (list_is_singular(&pagelist->head)) {
1330 le32_add_cpu((__le32*)pagelist->mapped_tail, 1);
1331 } else {
1332 struct page *page = list_first_entry(&pagelist->head,
1333 struct page, lru);
1334 void *addr = kmap_atomic(page);
1335 le32_add_cpu((__le32*)addr, 1);
1336 kunmap_atomic(addr);
1337 }
1338 } else {
1339 as_ctx->pagelist = pagelist;
1340 }
1341
1342 ceph_pagelist_encode_32(pagelist, name_len);
1343 ceph_pagelist_append(pagelist, name, name_len);
1344
1345 ceph_pagelist_encode_32(pagelist, as_ctx->sec_ctxlen);
1346 ceph_pagelist_append(pagelist, as_ctx->sec_ctx, as_ctx->sec_ctxlen);
1347
1348 err = 0;
1349out:
1350 if (pagelist && !as_ctx->pagelist)
1351 ceph_pagelist_release(pagelist);
1352 return err;
1353}
1354#endif /* CONFIG_CEPH_FS_SECURITY_LABEL */
1355#endif /* CONFIG_SECURITY */
1356
1357void ceph_release_acl_sec_ctx(struct ceph_acl_sec_ctx *as_ctx)
1358{
1359#ifdef CONFIG_CEPH_FS_POSIX_ACL
1360 posix_acl_release(as_ctx->acl);
1361 posix_acl_release(as_ctx->default_acl);
1362#endif
1363#ifdef CONFIG_CEPH_FS_SECURITY_LABEL
1364 security_release_secctx(as_ctx->sec_ctx, as_ctx->sec_ctxlen);
1365#endif
1366 if (as_ctx->pagelist)
1367 ceph_pagelist_release(as_ctx->pagelist);
1368}
1369
1370/*
1371 * List of handlers for synthetic system.* attributes. Other
1372 * attributes are handled directly.
1373 */
1374const struct xattr_handler *ceph_xattr_handlers[] = {
1375#ifdef CONFIG_CEPH_FS_POSIX_ACL
1376 &posix_acl_access_xattr_handler,
1377 &posix_acl_default_xattr_handler,
1378#endif
1379 &ceph_other_xattr_handler,
1380 NULL,
1381};