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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_fs_client(ci->netfs.inode.i_sb);
61 struct ceph_client *cl = fsc->client;
62 struct ceph_osd_client *osdc = &fsc->client->osdc;
63 struct ceph_string *pool_ns;
64 s64 pool = ci->i_layout.pool_id;
65 const char *pool_name;
66 const char *ns_field = " pool_namespace=";
67 char buf[128];
68 size_t len, total_len = 0;
69 ssize_t ret;
70
71 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);
72
73 doutc(cl, "%p\n", &ci->netfs.inode);
74 down_read(&osdc->lock);
75 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
76 if (pool_name) {
77 len = snprintf(buf, sizeof(buf),
78 "stripe_unit=%u stripe_count=%u object_size=%u pool=",
79 ci->i_layout.stripe_unit, ci->i_layout.stripe_count,
80 ci->i_layout.object_size);
81 total_len = len + strlen(pool_name);
82 } else {
83 len = snprintf(buf, sizeof(buf),
84 "stripe_unit=%u stripe_count=%u object_size=%u pool=%lld",
85 ci->i_layout.stripe_unit, ci->i_layout.stripe_count,
86 ci->i_layout.object_size, pool);
87 total_len = len;
88 }
89
90 if (pool_ns)
91 total_len += strlen(ns_field) + pool_ns->len;
92
93 ret = total_len;
94 if (size >= total_len) {
95 memcpy(val, buf, len);
96 ret = len;
97 if (pool_name) {
98 len = strlen(pool_name);
99 memcpy(val + ret, pool_name, len);
100 ret += len;
101 }
102 if (pool_ns) {
103 len = strlen(ns_field);
104 memcpy(val + ret, ns_field, len);
105 ret += len;
106 memcpy(val + ret, pool_ns->str, pool_ns->len);
107 ret += pool_ns->len;
108 }
109 }
110 up_read(&osdc->lock);
111 ceph_put_string(pool_ns);
112 return ret;
113}
114
115/*
116 * The convention with strings in xattrs is that they should not be NULL
117 * terminated, since we're returning the length with them. snprintf always
118 * NULL terminates however, so call it on a temporary buffer and then memcpy
119 * the result into place.
120 */
121static __printf(3, 4)
122int ceph_fmt_xattr(char *val, size_t size, const char *fmt, ...)
123{
124 int ret;
125 va_list args;
126 char buf[96]; /* NB: reevaluate size if new vxattrs are added */
127
128 va_start(args, fmt);
129 ret = vsnprintf(buf, size ? sizeof(buf) : 0, fmt, args);
130 va_end(args);
131
132 /* Sanity check */
133 if (size && ret + 1 > sizeof(buf)) {
134 WARN_ONCE(true, "Returned length too big (%d)", ret);
135 return -E2BIG;
136 }
137
138 if (ret <= size)
139 memcpy(val, buf, ret);
140 return ret;
141}
142
143static ssize_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci,
144 char *val, size_t size)
145{
146 return ceph_fmt_xattr(val, size, "%u", ci->i_layout.stripe_unit);
147}
148
149static ssize_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci,
150 char *val, size_t size)
151{
152 return ceph_fmt_xattr(val, size, "%u", ci->i_layout.stripe_count);
153}
154
155static ssize_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci,
156 char *val, size_t size)
157{
158 return ceph_fmt_xattr(val, size, "%u", ci->i_layout.object_size);
159}
160
161static ssize_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci,
162 char *val, size_t size)
163{
164 ssize_t ret;
165 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(ci->netfs.inode.i_sb);
166 struct ceph_osd_client *osdc = &fsc->client->osdc;
167 s64 pool = ci->i_layout.pool_id;
168 const char *pool_name;
169
170 down_read(&osdc->lock);
171 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
172 if (pool_name) {
173 ret = strlen(pool_name);
174 if (ret <= size)
175 memcpy(val, pool_name, ret);
176 } else {
177 ret = ceph_fmt_xattr(val, size, "%lld", pool);
178 }
179 up_read(&osdc->lock);
180 return ret;
181}
182
183static ssize_t ceph_vxattrcb_layout_pool_namespace(struct ceph_inode_info *ci,
184 char *val, size_t size)
185{
186 ssize_t ret = 0;
187 struct ceph_string *ns = ceph_try_get_string(ci->i_layout.pool_ns);
188
189 if (ns) {
190 ret = ns->len;
191 if (ret <= size)
192 memcpy(val, ns->str, ret);
193 ceph_put_string(ns);
194 }
195 return ret;
196}
197
198/* directories */
199
200static ssize_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val,
201 size_t size)
202{
203 return ceph_fmt_xattr(val, size, "%lld", ci->i_files + ci->i_subdirs);
204}
205
206static ssize_t ceph_vxattrcb_dir_files(struct ceph_inode_info *ci, char *val,
207 size_t size)
208{
209 return ceph_fmt_xattr(val, size, "%lld", ci->i_files);
210}
211
212static ssize_t ceph_vxattrcb_dir_subdirs(struct ceph_inode_info *ci, char *val,
213 size_t size)
214{
215 return ceph_fmt_xattr(val, size, "%lld", ci->i_subdirs);
216}
217
218static ssize_t ceph_vxattrcb_dir_rentries(struct ceph_inode_info *ci, char *val,
219 size_t size)
220{
221 return ceph_fmt_xattr(val, size, "%lld",
222 ci->i_rfiles + ci->i_rsubdirs);
223}
224
225static ssize_t ceph_vxattrcb_dir_rfiles(struct ceph_inode_info *ci, char *val,
226 size_t size)
227{
228 return ceph_fmt_xattr(val, size, "%lld", ci->i_rfiles);
229}
230
231static ssize_t ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info *ci, char *val,
232 size_t size)
233{
234 return ceph_fmt_xattr(val, size, "%lld", ci->i_rsubdirs);
235}
236
237static ssize_t ceph_vxattrcb_dir_rsnaps(struct ceph_inode_info *ci, char *val,
238 size_t size)
239{
240 return ceph_fmt_xattr(val, size, "%lld", ci->i_rsnaps);
241}
242
243static ssize_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val,
244 size_t size)
245{
246 return ceph_fmt_xattr(val, size, "%lld", ci->i_rbytes);
247}
248
249static ssize_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val,
250 size_t size)
251{
252 return ceph_fmt_xattr(val, size, "%ptSp", &ci->i_rctime);
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, "%ptSp", &ci->i_snap_btime);
310}
311
312static ssize_t ceph_vxattrcb_cluster_fsid(struct ceph_inode_info *ci,
313 char *val, size_t size)
314{
315 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(ci->netfs.inode.i_sb);
316
317 return ceph_fmt_xattr(val, size, "%pU", &fsc->client->fsid);
318}
319
320static ssize_t ceph_vxattrcb_client_id(struct ceph_inode_info *ci,
321 char *val, size_t size)
322{
323 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(ci->netfs.inode.i_sb);
324
325 return ceph_fmt_xattr(val, size, "client%lld",
326 ceph_client_gid(fsc->client));
327}
328
329static ssize_t ceph_vxattrcb_caps(struct ceph_inode_info *ci, char *val,
330 size_t size)
331{
332 int issued;
333
334 spin_lock(&ci->i_ceph_lock);
335 issued = __ceph_caps_issued(ci, NULL);
336 spin_unlock(&ci->i_ceph_lock);
337
338 return ceph_fmt_xattr(val, size, "%s/0x%x",
339 ceph_cap_string(issued), issued);
340}
341
342static ssize_t ceph_vxattrcb_auth_mds(struct ceph_inode_info *ci,
343 char *val, size_t size)
344{
345 int ret;
346
347 spin_lock(&ci->i_ceph_lock);
348 ret = ceph_fmt_xattr(val, size, "%d",
349 ci->i_auth_cap ? ci->i_auth_cap->session->s_mds : -1);
350 spin_unlock(&ci->i_ceph_lock);
351 return ret;
352}
353
354#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
355static bool ceph_vxattrcb_fscrypt_auth_exists(struct ceph_inode_info *ci)
356{
357 return ci->fscrypt_auth_len;
358}
359
360static ssize_t ceph_vxattrcb_fscrypt_auth(struct ceph_inode_info *ci,
361 char *val, size_t size)
362{
363 if (size) {
364 if (size < ci->fscrypt_auth_len)
365 return -ERANGE;
366 memcpy(val, ci->fscrypt_auth, ci->fscrypt_auth_len);
367 }
368 return ci->fscrypt_auth_len;
369}
370#endif /* CONFIG_FS_ENCRYPTION */
371
372#define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name
373#define CEPH_XATTR_NAME2(_type, _name, _name2) \
374 XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
375
376#define XATTR_NAME_CEPH(_type, _name, _flags) \
377 { \
378 .name = CEPH_XATTR_NAME(_type, _name), \
379 .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \
380 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
381 .exists_cb = NULL, \
382 .flags = (VXATTR_FLAG_READONLY | _flags), \
383 }
384#define XATTR_RSTAT_FIELD(_type, _name) \
385 XATTR_NAME_CEPH(_type, _name, VXATTR_FLAG_RSTAT)
386#define XATTR_RSTAT_FIELD_UPDATABLE(_type, _name) \
387 { \
388 .name = CEPH_XATTR_NAME(_type, _name), \
389 .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \
390 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
391 .exists_cb = NULL, \
392 .flags = VXATTR_FLAG_RSTAT, \
393 }
394#define XATTR_LAYOUT_FIELD(_type, _name, _field) \
395 { \
396 .name = CEPH_XATTR_NAME2(_type, _name, _field), \
397 .name_size = sizeof (CEPH_XATTR_NAME2(_type, _name, _field)), \
398 .getxattr_cb = ceph_vxattrcb_ ## _name ## _ ## _field, \
399 .exists_cb = ceph_vxattrcb_layout_exists, \
400 .flags = VXATTR_FLAG_HIDDEN, \
401 }
402#define XATTR_QUOTA_FIELD(_type, _name) \
403 { \
404 .name = CEPH_XATTR_NAME(_type, _name), \
405 .name_size = sizeof(CEPH_XATTR_NAME(_type, _name)), \
406 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
407 .exists_cb = ceph_vxattrcb_quota_exists, \
408 .flags = VXATTR_FLAG_HIDDEN, \
409 }
410
411static struct ceph_vxattr ceph_dir_vxattrs[] = {
412 {
413 .name = "ceph.dir.layout",
414 .name_size = sizeof("ceph.dir.layout"),
415 .getxattr_cb = ceph_vxattrcb_layout,
416 .exists_cb = ceph_vxattrcb_layout_exists,
417 .flags = VXATTR_FLAG_HIDDEN,
418 },
419 XATTR_LAYOUT_FIELD(dir, layout, stripe_unit),
420 XATTR_LAYOUT_FIELD(dir, layout, stripe_count),
421 XATTR_LAYOUT_FIELD(dir, layout, object_size),
422 XATTR_LAYOUT_FIELD(dir, layout, pool),
423 XATTR_LAYOUT_FIELD(dir, layout, pool_namespace),
424 XATTR_NAME_CEPH(dir, entries, VXATTR_FLAG_DIRSTAT),
425 XATTR_NAME_CEPH(dir, files, VXATTR_FLAG_DIRSTAT),
426 XATTR_NAME_CEPH(dir, subdirs, VXATTR_FLAG_DIRSTAT),
427 XATTR_RSTAT_FIELD(dir, rentries),
428 XATTR_RSTAT_FIELD(dir, rfiles),
429 XATTR_RSTAT_FIELD(dir, rsubdirs),
430 XATTR_RSTAT_FIELD(dir, rsnaps),
431 XATTR_RSTAT_FIELD(dir, rbytes),
432 XATTR_RSTAT_FIELD_UPDATABLE(dir, rctime),
433 {
434 .name = "ceph.dir.pin",
435 .name_size = sizeof("ceph.dir.pin"),
436 .getxattr_cb = ceph_vxattrcb_dir_pin,
437 .exists_cb = ceph_vxattrcb_dir_pin_exists,
438 .flags = VXATTR_FLAG_HIDDEN,
439 },
440 {
441 .name = "ceph.quota",
442 .name_size = sizeof("ceph.quota"),
443 .getxattr_cb = ceph_vxattrcb_quota,
444 .exists_cb = ceph_vxattrcb_quota_exists,
445 .flags = VXATTR_FLAG_HIDDEN,
446 },
447 XATTR_QUOTA_FIELD(quota, max_bytes),
448 XATTR_QUOTA_FIELD(quota, max_files),
449 {
450 .name = "ceph.snap.btime",
451 .name_size = sizeof("ceph.snap.btime"),
452 .getxattr_cb = ceph_vxattrcb_snap_btime,
453 .exists_cb = ceph_vxattrcb_snap_btime_exists,
454 .flags = VXATTR_FLAG_READONLY,
455 },
456 {
457 .name = "ceph.caps",
458 .name_size = sizeof("ceph.caps"),
459 .getxattr_cb = ceph_vxattrcb_caps,
460 .exists_cb = NULL,
461 .flags = VXATTR_FLAG_HIDDEN,
462 },
463 { .name = NULL, 0 } /* Required table terminator */
464};
465
466/* files */
467
468static struct ceph_vxattr ceph_file_vxattrs[] = {
469 {
470 .name = "ceph.file.layout",
471 .name_size = sizeof("ceph.file.layout"),
472 .getxattr_cb = ceph_vxattrcb_layout,
473 .exists_cb = ceph_vxattrcb_layout_exists,
474 .flags = VXATTR_FLAG_HIDDEN,
475 },
476 XATTR_LAYOUT_FIELD(file, layout, stripe_unit),
477 XATTR_LAYOUT_FIELD(file, layout, stripe_count),
478 XATTR_LAYOUT_FIELD(file, layout, object_size),
479 XATTR_LAYOUT_FIELD(file, layout, pool),
480 XATTR_LAYOUT_FIELD(file, layout, pool_namespace),
481 {
482 .name = "ceph.snap.btime",
483 .name_size = sizeof("ceph.snap.btime"),
484 .getxattr_cb = ceph_vxattrcb_snap_btime,
485 .exists_cb = ceph_vxattrcb_snap_btime_exists,
486 .flags = VXATTR_FLAG_READONLY,
487 },
488 {
489 .name = "ceph.caps",
490 .name_size = sizeof("ceph.caps"),
491 .getxattr_cb = ceph_vxattrcb_caps,
492 .exists_cb = NULL,
493 .flags = VXATTR_FLAG_HIDDEN,
494 },
495 { .name = NULL, 0 } /* Required table terminator */
496};
497
498static struct ceph_vxattr ceph_common_vxattrs[] = {
499 {
500 .name = "ceph.cluster_fsid",
501 .name_size = sizeof("ceph.cluster_fsid"),
502 .getxattr_cb = ceph_vxattrcb_cluster_fsid,
503 .exists_cb = NULL,
504 .flags = VXATTR_FLAG_READONLY,
505 },
506 {
507 .name = "ceph.client_id",
508 .name_size = sizeof("ceph.client_id"),
509 .getxattr_cb = ceph_vxattrcb_client_id,
510 .exists_cb = NULL,
511 .flags = VXATTR_FLAG_READONLY,
512 },
513 {
514 .name = "ceph.auth_mds",
515 .name_size = sizeof("ceph.auth_mds"),
516 .getxattr_cb = ceph_vxattrcb_auth_mds,
517 .exists_cb = NULL,
518 .flags = VXATTR_FLAG_READONLY,
519 },
520#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
521 {
522 .name = "ceph.fscrypt.auth",
523 .name_size = sizeof("ceph.fscrypt.auth"),
524 .getxattr_cb = ceph_vxattrcb_fscrypt_auth,
525 .exists_cb = ceph_vxattrcb_fscrypt_auth_exists,
526 .flags = VXATTR_FLAG_READONLY,
527 },
528#endif /* CONFIG_FS_ENCRYPTION */
529 { .name = NULL, 0 } /* Required table terminator */
530};
531
532static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode)
533{
534 if (S_ISDIR(inode->i_mode))
535 return ceph_dir_vxattrs;
536 else if (S_ISREG(inode->i_mode))
537 return ceph_file_vxattrs;
538 return NULL;
539}
540
541static struct ceph_vxattr *ceph_match_vxattr(struct inode *inode,
542 const char *name)
543{
544 struct ceph_vxattr *vxattr = ceph_inode_vxattrs(inode);
545
546 if (vxattr) {
547 while (vxattr->name) {
548 if (!strcmp(vxattr->name, name))
549 return vxattr;
550 vxattr++;
551 }
552 }
553
554 vxattr = ceph_common_vxattrs;
555 while (vxattr->name) {
556 if (!strcmp(vxattr->name, name))
557 return vxattr;
558 vxattr++;
559 }
560
561 return NULL;
562}
563
564#define MAX_XATTR_VAL_PRINT_LEN 256
565
566static int __set_xattr(struct ceph_inode_info *ci,
567 const char *name, int name_len,
568 const char *val, int val_len,
569 int flags, int update_xattr,
570 struct ceph_inode_xattr **newxattr)
571{
572 struct inode *inode = &ci->netfs.inode;
573 struct ceph_client *cl = ceph_inode_to_client(inode);
574 struct rb_node **p;
575 struct rb_node *parent = NULL;
576 struct ceph_inode_xattr *xattr = NULL;
577 int c;
578 int new = 0;
579
580 p = &ci->i_xattrs.index.rb_node;
581 while (*p) {
582 parent = *p;
583 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
584 c = strncmp(name, xattr->name, min(name_len, xattr->name_len));
585 if (c < 0)
586 p = &(*p)->rb_left;
587 else if (c > 0)
588 p = &(*p)->rb_right;
589 else {
590 if (name_len == xattr->name_len)
591 break;
592 else if (name_len < xattr->name_len)
593 p = &(*p)->rb_left;
594 else
595 p = &(*p)->rb_right;
596 }
597 xattr = NULL;
598 }
599
600 if (update_xattr) {
601 int err = 0;
602
603 if (xattr && (flags & XATTR_CREATE))
604 err = -EEXIST;
605 else if (!xattr && (flags & XATTR_REPLACE))
606 err = -ENODATA;
607 if (err) {
608 kfree(name);
609 kfree(val);
610 kfree(*newxattr);
611 return err;
612 }
613 if (update_xattr < 0) {
614 if (xattr)
615 __remove_xattr(ci, xattr);
616 kfree(name);
617 kfree(*newxattr);
618 return 0;
619 }
620 }
621
622 if (!xattr) {
623 new = 1;
624 xattr = *newxattr;
625 xattr->name = name;
626 xattr->name_len = name_len;
627 xattr->should_free_name = update_xattr;
628
629 ci->i_xattrs.count++;
630 doutc(cl, "count=%d\n", ci->i_xattrs.count);
631 } else {
632 kfree(*newxattr);
633 *newxattr = NULL;
634 if (xattr->should_free_val)
635 kfree(xattr->val);
636
637 if (update_xattr) {
638 kfree(name);
639 name = xattr->name;
640 }
641 ci->i_xattrs.names_size -= xattr->name_len;
642 ci->i_xattrs.vals_size -= xattr->val_len;
643 }
644 ci->i_xattrs.names_size += name_len;
645 ci->i_xattrs.vals_size += val_len;
646 if (val)
647 xattr->val = val;
648 else
649 xattr->val = "";
650
651 xattr->val_len = val_len;
652 xattr->dirty = update_xattr;
653 xattr->should_free_val = (val && update_xattr);
654
655 if (new) {
656 rb_link_node(&xattr->node, parent, p);
657 rb_insert_color(&xattr->node, &ci->i_xattrs.index);
658 doutc(cl, "p=%p\n", p);
659 }
660
661 doutc(cl, "added %p %llx.%llx xattr %p %.*s=%.*s%s\n", inode,
662 ceph_vinop(inode), xattr, name_len, name, min(val_len,
663 MAX_XATTR_VAL_PRINT_LEN), val,
664 val_len > MAX_XATTR_VAL_PRINT_LEN ? "..." : "");
665
666 return 0;
667}
668
669static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci,
670 const char *name)
671{
672 struct ceph_client *cl = ceph_inode_to_client(&ci->netfs.inode);
673 struct rb_node **p;
674 struct rb_node *parent = NULL;
675 struct ceph_inode_xattr *xattr = NULL;
676 int name_len = strlen(name);
677 int c;
678
679 p = &ci->i_xattrs.index.rb_node;
680 while (*p) {
681 parent = *p;
682 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
683 c = strncmp(name, xattr->name, xattr->name_len);
684 if (c == 0 && name_len > xattr->name_len)
685 c = 1;
686 if (c < 0)
687 p = &(*p)->rb_left;
688 else if (c > 0)
689 p = &(*p)->rb_right;
690 else {
691 int len = min(xattr->val_len, MAX_XATTR_VAL_PRINT_LEN);
692
693 doutc(cl, "%s found %.*s%s\n", name, len, xattr->val,
694 xattr->val_len > len ? "..." : "");
695 return xattr;
696 }
697 }
698
699 doutc(cl, "%s not found\n", name);
700
701 return NULL;
702}
703
704static void __free_xattr(struct ceph_inode_xattr *xattr)
705{
706 BUG_ON(!xattr);
707
708 if (xattr->should_free_name)
709 kfree(xattr->name);
710 if (xattr->should_free_val)
711 kfree(xattr->val);
712
713 kfree(xattr);
714}
715
716static int __remove_xattr(struct ceph_inode_info *ci,
717 struct ceph_inode_xattr *xattr)
718{
719 if (!xattr)
720 return -ENODATA;
721
722 rb_erase(&xattr->node, &ci->i_xattrs.index);
723
724 if (xattr->should_free_name)
725 kfree(xattr->name);
726 if (xattr->should_free_val)
727 kfree(xattr->val);
728
729 ci->i_xattrs.names_size -= xattr->name_len;
730 ci->i_xattrs.vals_size -= xattr->val_len;
731 ci->i_xattrs.count--;
732 kfree(xattr);
733
734 return 0;
735}
736
737static char *__copy_xattr_names(struct ceph_inode_info *ci,
738 char *dest)
739{
740 struct ceph_client *cl = ceph_inode_to_client(&ci->netfs.inode);
741 struct rb_node *p;
742 struct ceph_inode_xattr *xattr = NULL;
743
744 p = rb_first(&ci->i_xattrs.index);
745 doutc(cl, "count=%d\n", ci->i_xattrs.count);
746
747 while (p) {
748 xattr = rb_entry(p, struct ceph_inode_xattr, node);
749 memcpy(dest, xattr->name, xattr->name_len);
750 dest[xattr->name_len] = '\0';
751
752 doutc(cl, "dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name,
753 xattr->name_len, ci->i_xattrs.names_size);
754
755 dest += xattr->name_len + 1;
756 p = rb_next(p);
757 }
758
759 return dest;
760}
761
762void __ceph_destroy_xattrs(struct ceph_inode_info *ci)
763{
764 struct ceph_client *cl = ceph_inode_to_client(&ci->netfs.inode);
765 struct rb_node *p, *tmp;
766 struct ceph_inode_xattr *xattr = NULL;
767
768 p = rb_first(&ci->i_xattrs.index);
769
770 doutc(cl, "p=%p\n", p);
771
772 while (p) {
773 xattr = rb_entry(p, struct ceph_inode_xattr, node);
774 tmp = p;
775 p = rb_next(tmp);
776 doutc(cl, "next p=%p (%.*s)\n", p, xattr->name_len, xattr->name);
777 rb_erase(tmp, &ci->i_xattrs.index);
778
779 __free_xattr(xattr);
780 }
781
782 ci->i_xattrs.names_size = 0;
783 ci->i_xattrs.vals_size = 0;
784 ci->i_xattrs.index_version = 0;
785 ci->i_xattrs.count = 0;
786 ci->i_xattrs.index = RB_ROOT;
787}
788
789static int __build_xattrs(struct inode *inode)
790 __releases(ci->i_ceph_lock)
791 __acquires(ci->i_ceph_lock)
792{
793 struct ceph_client *cl = ceph_inode_to_client(inode);
794 u32 namelen;
795 u32 numattr = 0;
796 void *p, *end;
797 u32 len;
798 const char *name, *val;
799 struct ceph_inode_info *ci = ceph_inode(inode);
800 u64 xattr_version;
801 struct ceph_inode_xattr **xattrs = NULL;
802 int err = 0;
803 int i;
804
805 doutc(cl, "len=%d\n",
806 ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0);
807
808 if (ci->i_xattrs.index_version >= ci->i_xattrs.version)
809 return 0; /* already built */
810
811 __ceph_destroy_xattrs(ci);
812
813start:
814 /* updated internal xattr rb tree */
815 if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) {
816 p = ci->i_xattrs.blob->vec.iov_base;
817 end = p + ci->i_xattrs.blob->vec.iov_len;
818 ceph_decode_32_safe(&p, end, numattr, bad);
819 xattr_version = ci->i_xattrs.version;
820 spin_unlock(&ci->i_ceph_lock);
821
822 xattrs = kzalloc_objs(struct ceph_inode_xattr *, numattr,
823 GFP_NOFS);
824 err = -ENOMEM;
825 if (!xattrs)
826 goto bad_lock;
827
828 for (i = 0; i < numattr; i++) {
829 xattrs[i] = kmalloc_obj(struct ceph_inode_xattr,
830 GFP_NOFS);
831 if (!xattrs[i])
832 goto bad_lock;
833 }
834
835 spin_lock(&ci->i_ceph_lock);
836 if (ci->i_xattrs.version != xattr_version) {
837 /* lost a race, retry */
838 for (i = 0; i < numattr; i++)
839 kfree(xattrs[i]);
840 kfree(xattrs);
841 xattrs = NULL;
842 goto start;
843 }
844 err = -EIO;
845 while (numattr--) {
846 ceph_decode_32_safe(&p, end, len, bad);
847 namelen = len;
848 name = p;
849 p += len;
850 ceph_decode_32_safe(&p, end, len, bad);
851 ceph_decode_need(&p, end, len, bad);
852 val = p;
853 p += len;
854
855 err = __set_xattr(ci, name, namelen, val, len,
856 0, 0, &xattrs[numattr]);
857
858 if (err < 0)
859 goto bad;
860 }
861 kfree(xattrs);
862 }
863 ci->i_xattrs.index_version = ci->i_xattrs.version;
864 ci->i_xattrs.dirty = false;
865
866 return err;
867bad_lock:
868 spin_lock(&ci->i_ceph_lock);
869bad:
870 if (xattrs) {
871 for (i = 0; i < numattr; i++)
872 kfree(xattrs[i]);
873 kfree(xattrs);
874 }
875 ci->i_xattrs.names_size = 0;
876 return err;
877}
878
879static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size,
880 int val_size)
881{
882 struct ceph_client *cl = ceph_inode_to_client(&ci->netfs.inode);
883
884 /*
885 * 4 bytes for the length, and additional 4 bytes per each xattr name,
886 * 4 bytes per each value
887 */
888 int size = 4 + ci->i_xattrs.count*(4 + 4) +
889 ci->i_xattrs.names_size +
890 ci->i_xattrs.vals_size;
891 doutc(cl, "c=%d names.size=%d vals.size=%d\n", ci->i_xattrs.count,
892 ci->i_xattrs.names_size, ci->i_xattrs.vals_size);
893
894 if (name_size)
895 size += 4 + 4 + name_size + val_size;
896
897 return size;
898}
899
900/*
901 * If there are dirty xattrs, re-encode xattrs into the prealloc_blob
902 * and swap into place. It returns the old i_xattrs.blob (or NULL) so
903 * that it can be freed by the caller as the i_ceph_lock is likely to be
904 * held.
905 */
906struct ceph_buffer *__ceph_build_xattrs_blob(struct ceph_inode_info *ci)
907{
908 struct inode *inode = &ci->netfs.inode;
909 struct ceph_client *cl = ceph_inode_to_client(inode);
910 struct rb_node *p;
911 struct ceph_inode_xattr *xattr = NULL;
912 struct ceph_buffer *old_blob = NULL;
913 void *dest;
914
915 doutc(cl, "%p %llx.%llx\n", inode, ceph_vinop(inode));
916 if (ci->i_xattrs.dirty) {
917 int need = __get_required_blob_size(ci, 0, 0);
918
919 BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len);
920
921 p = rb_first(&ci->i_xattrs.index);
922 dest = ci->i_xattrs.prealloc_blob->vec.iov_base;
923
924 ceph_encode_32(&dest, ci->i_xattrs.count);
925 while (p) {
926 xattr = rb_entry(p, struct ceph_inode_xattr, node);
927
928 ceph_encode_32(&dest, xattr->name_len);
929 memcpy(dest, xattr->name, xattr->name_len);
930 dest += xattr->name_len;
931 ceph_encode_32(&dest, xattr->val_len);
932 memcpy(dest, xattr->val, xattr->val_len);
933 dest += xattr->val_len;
934
935 p = rb_next(p);
936 }
937
938 /* adjust buffer len; it may be larger than we need */
939 ci->i_xattrs.prealloc_blob->vec.iov_len =
940 dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
941
942 if (ci->i_xattrs.blob)
943 old_blob = ci->i_xattrs.blob;
944 ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
945 ci->i_xattrs.prealloc_blob = NULL;
946 ci->i_xattrs.dirty = false;
947 ci->i_xattrs.version++;
948 }
949
950 return old_blob;
951}
952
953static inline int __get_request_mask(struct inode *in) {
954 struct ceph_mds_request *req = current->journal_info;
955 int mask = 0;
956 if (req && req->r_target_inode == in) {
957 if (req->r_op == CEPH_MDS_OP_LOOKUP ||
958 req->r_op == CEPH_MDS_OP_LOOKUPINO ||
959 req->r_op == CEPH_MDS_OP_LOOKUPPARENT ||
960 req->r_op == CEPH_MDS_OP_GETATTR) {
961 mask = le32_to_cpu(req->r_args.getattr.mask);
962 } else if (req->r_op == CEPH_MDS_OP_OPEN ||
963 req->r_op == CEPH_MDS_OP_CREATE) {
964 mask = le32_to_cpu(req->r_args.open.mask);
965 }
966 }
967 return mask;
968}
969
970ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
971 size_t size)
972{
973 struct ceph_client *cl = ceph_inode_to_client(inode);
974 struct ceph_inode_info *ci = ceph_inode(inode);
975 struct ceph_inode_xattr *xattr;
976 struct ceph_vxattr *vxattr;
977 int req_mask;
978 ssize_t err;
979
980 if (strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
981 goto handle_non_vxattrs;
982
983 /* let's see if a virtual xattr was requested */
984 vxattr = ceph_match_vxattr(inode, name);
985 if (vxattr) {
986 int mask = 0;
987 if (vxattr->flags & VXATTR_FLAG_RSTAT)
988 mask |= CEPH_STAT_RSTAT;
989 if (vxattr->flags & VXATTR_FLAG_DIRSTAT)
990 mask |= CEPH_CAP_FILE_SHARED;
991 err = ceph_do_getattr(inode, mask, true);
992 if (err)
993 return err;
994 err = -ENODATA;
995 if (!(vxattr->exists_cb && !vxattr->exists_cb(ci))) {
996 err = vxattr->getxattr_cb(ci, value, size);
997 if (size && size < err)
998 err = -ERANGE;
999 }
1000 return err;
1001 } else {
1002 err = ceph_do_getvxattr(inode, name, value, size);
1003 /* this would happen with a new client and old server combo */
1004 if (err == -EOPNOTSUPP)
1005 err = -ENODATA;
1006 return err;
1007 }
1008handle_non_vxattrs:
1009 req_mask = __get_request_mask(inode);
1010
1011 spin_lock(&ci->i_ceph_lock);
1012 doutc(cl, "%p %llx.%llx name '%s' ver=%lld index_ver=%lld\n", inode,
1013 ceph_vinop(inode), name, ci->i_xattrs.version,
1014 ci->i_xattrs.index_version);
1015
1016 if (ci->i_xattrs.version == 0 ||
1017 !((req_mask & CEPH_CAP_XATTR_SHARED) ||
1018 __ceph_caps_issued_mask_metric(ci, CEPH_CAP_XATTR_SHARED, 1))) {
1019 spin_unlock(&ci->i_ceph_lock);
1020
1021 /* security module gets xattr while filling trace */
1022 if (current->journal_info) {
1023 pr_warn_ratelimited_client(cl,
1024 "sync %p %llx.%llx during filling trace\n",
1025 inode, ceph_vinop(inode));
1026 return -EBUSY;
1027 }
1028
1029 /* get xattrs from mds (if we don't already have them) */
1030 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
1031 if (err)
1032 return err;
1033 spin_lock(&ci->i_ceph_lock);
1034 }
1035
1036 err = __build_xattrs(inode);
1037 if (err < 0)
1038 goto out;
1039
1040 err = -ENODATA; /* == ENOATTR */
1041 xattr = __get_xattr(ci, name);
1042 if (!xattr)
1043 goto out;
1044
1045 err = -ERANGE;
1046 if (size && size < xattr->val_len)
1047 goto out;
1048
1049 err = xattr->val_len;
1050 if (size == 0)
1051 goto out;
1052
1053 memcpy(value, xattr->val, xattr->val_len);
1054
1055 if (current->journal_info &&
1056 !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) &&
1057 security_ismaclabel(name + XATTR_SECURITY_PREFIX_LEN))
1058 set_bit(CEPH_I_SEC_INITED_BIT, &ci->i_ceph_flags);
1059out:
1060 spin_unlock(&ci->i_ceph_lock);
1061 return err;
1062}
1063
1064ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
1065{
1066 struct inode *inode = d_inode(dentry);
1067 struct ceph_client *cl = ceph_inode_to_client(inode);
1068 struct ceph_inode_info *ci = ceph_inode(inode);
1069 bool len_only = (size == 0);
1070 u32 namelen;
1071 int err;
1072
1073 spin_lock(&ci->i_ceph_lock);
1074 doutc(cl, "%p %llx.%llx ver=%lld index_ver=%lld\n", inode,
1075 ceph_vinop(inode), ci->i_xattrs.version,
1076 ci->i_xattrs.index_version);
1077
1078 if (ci->i_xattrs.version == 0 ||
1079 !__ceph_caps_issued_mask_metric(ci, CEPH_CAP_XATTR_SHARED, 1)) {
1080 spin_unlock(&ci->i_ceph_lock);
1081 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
1082 if (err)
1083 return err;
1084 spin_lock(&ci->i_ceph_lock);
1085 }
1086
1087 err = __build_xattrs(inode);
1088 if (err < 0)
1089 goto out;
1090
1091 /* add 1 byte for each xattr due to the null termination */
1092 namelen = ci->i_xattrs.names_size + ci->i_xattrs.count;
1093 if (!len_only) {
1094 if (namelen > size) {
1095 err = -ERANGE;
1096 goto out;
1097 }
1098 names = __copy_xattr_names(ci, names);
1099 size -= namelen;
1100 }
1101 err = namelen;
1102out:
1103 spin_unlock(&ci->i_ceph_lock);
1104 return err;
1105}
1106
1107static int ceph_sync_setxattr(struct inode *inode, const char *name,
1108 const char *value, size_t size, int flags)
1109{
1110 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(inode->i_sb);
1111 struct ceph_client *cl = ceph_inode_to_client(inode);
1112 struct ceph_inode_info *ci = ceph_inode(inode);
1113 struct ceph_mds_request *req;
1114 struct ceph_mds_client *mdsc = fsc->mdsc;
1115 struct ceph_osd_client *osdc = &fsc->client->osdc;
1116 struct ceph_pagelist *pagelist = NULL;
1117 int op = CEPH_MDS_OP_SETXATTR;
1118 int err;
1119
1120 if (size > 0) {
1121 /* copy value into pagelist */
1122 pagelist = ceph_pagelist_alloc(GFP_NOFS);
1123 if (!pagelist)
1124 return -ENOMEM;
1125
1126 err = ceph_pagelist_append(pagelist, value, size);
1127 if (err)
1128 goto out;
1129 } else if (!value) {
1130 if (flags & CEPH_XATTR_REPLACE)
1131 op = CEPH_MDS_OP_RMXATTR;
1132 else
1133 flags |= CEPH_XATTR_REMOVE;
1134 }
1135
1136 doutc(cl, "name %s value size %zu\n", name, size);
1137
1138 /* do request */
1139 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
1140 if (IS_ERR(req)) {
1141 err = PTR_ERR(req);
1142 goto out;
1143 }
1144
1145 req->r_path2 = kstrdup(name, GFP_NOFS);
1146 if (!req->r_path2) {
1147 ceph_mdsc_put_request(req);
1148 err = -ENOMEM;
1149 goto out;
1150 }
1151
1152 if (op == CEPH_MDS_OP_SETXATTR) {
1153 req->r_args.setxattr.flags = cpu_to_le32(flags);
1154 req->r_args.setxattr.osdmap_epoch =
1155 cpu_to_le32(osdc->osdmap->epoch);
1156 req->r_pagelist = pagelist;
1157 pagelist = NULL;
1158 }
1159
1160 req->r_inode = inode;
1161 ihold(inode);
1162 req->r_num_caps = 1;
1163 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
1164
1165 doutc(cl, "xattr.ver (before): %lld\n", ci->i_xattrs.version);
1166 err = ceph_mdsc_do_request(mdsc, NULL, req);
1167 ceph_mdsc_put_request(req);
1168 doutc(cl, "xattr.ver (after): %lld\n", ci->i_xattrs.version);
1169
1170out:
1171 if (pagelist)
1172 ceph_pagelist_release(pagelist);
1173 return err;
1174}
1175
1176int __ceph_setxattr(struct inode *inode, const char *name,
1177 const void *value, size_t size, int flags)
1178{
1179 struct ceph_client *cl = ceph_inode_to_client(inode);
1180 struct ceph_vxattr *vxattr;
1181 struct ceph_inode_info *ci = ceph_inode(inode);
1182 struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(inode->i_sb)->mdsc;
1183 struct ceph_cap_flush *prealloc_cf = NULL;
1184 struct ceph_buffer *old_blob = NULL;
1185 int issued;
1186 int err;
1187 int dirty = 0;
1188 int name_len = strlen(name);
1189 int val_len = size;
1190 char *newname = NULL;
1191 char *newval = NULL;
1192 struct ceph_inode_xattr *xattr = NULL;
1193 int required_blob_size;
1194 bool check_realm = false;
1195 bool lock_snap_rwsem = false;
1196
1197 if (ceph_snap(inode) != CEPH_NOSNAP)
1198 return -EROFS;
1199
1200 vxattr = ceph_match_vxattr(inode, name);
1201 if (vxattr) {
1202 if (vxattr->flags & VXATTR_FLAG_READONLY)
1203 return -EOPNOTSUPP;
1204 if (value && !strncmp(vxattr->name, "ceph.quota", 10))
1205 check_realm = true;
1206 }
1207
1208 /* pass any unhandled ceph.* xattrs through to the MDS */
1209 if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
1210 goto do_sync_unlocked;
1211
1212 /* preallocate memory for xattr name, value, index node */
1213 err = -ENOMEM;
1214 newname = kmemdup(name, name_len + 1, GFP_NOFS);
1215 if (!newname)
1216 goto out;
1217
1218 if (val_len) {
1219 newval = kmemdup(value, val_len, GFP_NOFS);
1220 if (!newval)
1221 goto out;
1222 }
1223
1224 xattr = kmalloc_obj(struct ceph_inode_xattr, GFP_NOFS);
1225 if (!xattr)
1226 goto out;
1227
1228 prealloc_cf = ceph_alloc_cap_flush();
1229 if (!prealloc_cf)
1230 goto out;
1231
1232 spin_lock(&ci->i_ceph_lock);
1233retry:
1234 issued = __ceph_caps_issued(ci, NULL);
1235 required_blob_size = __get_required_blob_size(ci, name_len, val_len);
1236 if ((ci->i_xattrs.version == 0) || !(issued & CEPH_CAP_XATTR_EXCL) ||
1237 (required_blob_size > mdsc->mdsmap->m_max_xattr_size)) {
1238 doutc(cl, "sync version: %llu size: %d max: %llu\n",
1239 ci->i_xattrs.version, required_blob_size,
1240 mdsc->mdsmap->m_max_xattr_size);
1241 goto do_sync;
1242 }
1243
1244 if (!lock_snap_rwsem && !ci->i_head_snapc) {
1245 lock_snap_rwsem = true;
1246 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1247 spin_unlock(&ci->i_ceph_lock);
1248 down_read(&mdsc->snap_rwsem);
1249 spin_lock(&ci->i_ceph_lock);
1250 goto retry;
1251 }
1252 }
1253
1254 doutc(cl, "%p %llx.%llx name '%s' issued %s\n", inode,
1255 ceph_vinop(inode), name, ceph_cap_string(issued));
1256 __build_xattrs(inode);
1257
1258 /*
1259 * __build_xattrs() may have released and reacquired i_ceph_lock,
1260 * during which handle_cap_grant() could have replaced i_xattrs.blob
1261 * with a newer MDS-provided blob and bumped i_xattrs.version. If that
1262 * caused __build_xattrs() to rebuild the rb-tree from the new blob,
1263 * count/names_size/vals_size may now be larger than when
1264 * required_blob_size was computed above. Recompute it here so the
1265 * prealloc_blob size check below reflects the current tree state.
1266 */
1267 required_blob_size = __get_required_blob_size(ci, name_len, val_len);
1268 if (required_blob_size > mdsc->mdsmap->m_max_xattr_size) {
1269 doutc(cl, "sync (size too large): %d > %llu\n",
1270 required_blob_size, mdsc->mdsmap->m_max_xattr_size);
1271 goto do_sync;
1272 }
1273
1274 if (!ci->i_xattrs.prealloc_blob ||
1275 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
1276 struct ceph_buffer *blob;
1277
1278 spin_unlock(&ci->i_ceph_lock);
1279 ceph_buffer_put(old_blob); /* Shouldn't be required */
1280 doutc(cl, " pre-allocating new blob size=%d\n",
1281 required_blob_size);
1282 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
1283 if (!blob)
1284 goto do_sync_unlocked;
1285 spin_lock(&ci->i_ceph_lock);
1286 /* prealloc_blob can't be released while holding i_ceph_lock */
1287 if (ci->i_xattrs.prealloc_blob)
1288 old_blob = ci->i_xattrs.prealloc_blob;
1289 ci->i_xattrs.prealloc_blob = blob;
1290 goto retry;
1291 }
1292
1293 err = __set_xattr(ci, newname, name_len, newval, val_len,
1294 flags, value ? 1 : -1, &xattr);
1295
1296 if (!err) {
1297 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL,
1298 &prealloc_cf);
1299 ci->i_xattrs.dirty = true;
1300 inode_set_ctime_current(inode);
1301 }
1302
1303 spin_unlock(&ci->i_ceph_lock);
1304 ceph_buffer_put(old_blob);
1305 if (lock_snap_rwsem)
1306 up_read(&mdsc->snap_rwsem);
1307 if (dirty)
1308 __mark_inode_dirty(inode, dirty);
1309 ceph_free_cap_flush(prealloc_cf);
1310 return err;
1311
1312do_sync:
1313 spin_unlock(&ci->i_ceph_lock);
1314 ceph_buffer_put(old_blob);
1315do_sync_unlocked:
1316 if (lock_snap_rwsem)
1317 up_read(&mdsc->snap_rwsem);
1318
1319 /* security module set xattr while filling trace */
1320 if (current->journal_info) {
1321 pr_warn_ratelimited_client(cl,
1322 "sync %p %llx.%llx during filling trace\n",
1323 inode, ceph_vinop(inode));
1324 err = -EBUSY;
1325 } else {
1326 err = ceph_sync_setxattr(inode, name, value, size, flags);
1327 if (err >= 0 && check_realm) {
1328 /* check if snaprealm was created for quota inode */
1329 spin_lock(&ci->i_ceph_lock);
1330 if ((ci->i_max_files || ci->i_max_bytes) &&
1331 !(ci->i_snap_realm &&
1332 ci->i_snap_realm->ino == ci->i_vino.ino))
1333 err = -EOPNOTSUPP;
1334 spin_unlock(&ci->i_ceph_lock);
1335 }
1336 }
1337out:
1338 ceph_free_cap_flush(prealloc_cf);
1339 kfree(newname);
1340 kfree(newval);
1341 kfree(xattr);
1342 return err;
1343}
1344
1345static int ceph_get_xattr_handler(const struct xattr_handler *handler,
1346 struct dentry *dentry, struct inode *inode,
1347 const char *name, void *value, size_t size)
1348{
1349 if (!ceph_is_valid_xattr(name))
1350 return -EOPNOTSUPP;
1351 return __ceph_getxattr(inode, name, value, size);
1352}
1353
1354static int ceph_set_xattr_handler(const struct xattr_handler *handler,
1355 const struct mnt_idmap *idmap,
1356 struct dentry *unused, struct inode *inode,
1357 const char *name, const void *value,
1358 size_t size, int flags)
1359{
1360 if (!ceph_is_valid_xattr(name))
1361 return -EOPNOTSUPP;
1362 return __ceph_setxattr(inode, name, value, size, flags);
1363}
1364
1365static const struct xattr_handler ceph_other_xattr_handler = {
1366 .prefix = "", /* match any name => handlers called with full name */
1367 .get = ceph_get_xattr_handler,
1368 .set = ceph_set_xattr_handler,
1369};
1370
1371#ifdef CONFIG_SECURITY
1372bool ceph_security_xattr_wanted(struct inode *in)
1373{
1374 return in->i_security != NULL;
1375}
1376
1377bool ceph_security_xattr_deadlock(struct inode *in)
1378{
1379 struct ceph_inode_info *ci;
1380 bool ret;
1381 if (!in->i_security)
1382 return false;
1383 ci = ceph_inode(in);
1384 spin_lock(&ci->i_ceph_lock);
1385 ret = !(ci->i_ceph_flags & CEPH_I_SEC_INITED) &&
1386 !(ci->i_xattrs.version > 0 &&
1387 __ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0));
1388 spin_unlock(&ci->i_ceph_lock);
1389 return ret;
1390}
1391
1392#ifdef CONFIG_CEPH_FS_SECURITY_LABEL
1393int ceph_security_init_secctx(struct dentry *dentry, umode_t mode,
1394 struct ceph_acl_sec_ctx *as_ctx)
1395{
1396 struct ceph_pagelist *pagelist = as_ctx->pagelist;
1397 const char *name;
1398 size_t name_len;
1399 int err;
1400
1401 err = security_dentry_init_security(dentry, mode, &dentry->d_name,
1402 &name, &as_ctx->lsmctx);
1403 if (err < 0) {
1404 WARN_ON_ONCE(err != -EOPNOTSUPP);
1405 err = 0; /* do nothing */
1406 goto out;
1407 }
1408
1409 err = -ENOMEM;
1410 if (!pagelist) {
1411 pagelist = ceph_pagelist_alloc(GFP_KERNEL);
1412 if (!pagelist)
1413 goto out;
1414 err = ceph_pagelist_reserve(pagelist, PAGE_SIZE);
1415 if (err)
1416 goto out;
1417 ceph_pagelist_encode_32(pagelist, 1);
1418 }
1419
1420 /*
1421 * FIXME: Make security_dentry_init_security() generic. Currently
1422 * It only supports single security module and only selinux has
1423 * dentry_init_security hook.
1424 */
1425 name_len = strlen(name);
1426 err = ceph_pagelist_reserve(pagelist,
1427 4 * 2 + name_len + as_ctx->lsmctx.len);
1428 if (err)
1429 goto out;
1430
1431 if (as_ctx->pagelist) {
1432 /* update count of KV pairs */
1433 BUG_ON(pagelist->length <= sizeof(__le32));
1434 if (list_is_singular(&pagelist->head)) {
1435 le32_add_cpu((__le32*)pagelist->mapped_tail, 1);
1436 } else {
1437 struct page *page = list_first_entry(&pagelist->head,
1438 struct page, lru);
1439 void *addr = kmap_atomic(page);
1440 le32_add_cpu((__le32*)addr, 1);
1441 kunmap_atomic(addr);
1442 }
1443 } else {
1444 as_ctx->pagelist = pagelist;
1445 }
1446
1447 ceph_pagelist_encode_32(pagelist, name_len);
1448 ceph_pagelist_append(pagelist, name, name_len);
1449
1450 ceph_pagelist_encode_32(pagelist, as_ctx->lsmctx.len);
1451 ceph_pagelist_append(pagelist, as_ctx->lsmctx.context,
1452 as_ctx->lsmctx.len);
1453
1454 err = 0;
1455out:
1456 if (pagelist && !as_ctx->pagelist)
1457 ceph_pagelist_release(pagelist);
1458 return err;
1459}
1460#endif /* CONFIG_CEPH_FS_SECURITY_LABEL */
1461#endif /* CONFIG_SECURITY */
1462
1463void ceph_release_acl_sec_ctx(struct ceph_acl_sec_ctx *as_ctx)
1464{
1465#ifdef CONFIG_CEPH_FS_POSIX_ACL
1466 posix_acl_release(as_ctx->acl);
1467 posix_acl_release(as_ctx->default_acl);
1468#endif
1469#ifdef CONFIG_CEPH_FS_SECURITY_LABEL
1470 security_release_secctx(&as_ctx->lsmctx);
1471#endif
1472#ifdef CONFIG_FS_ENCRYPTION
1473 kfree(as_ctx->fscrypt_auth);
1474#endif
1475 if (as_ctx->pagelist)
1476 ceph_pagelist_release(as_ctx->pagelist);
1477}
1478
1479/*
1480 * List of handlers for synthetic system.* attributes. Other
1481 * attributes are handled directly.
1482 */
1483const struct xattr_handler * const ceph_xattr_handlers[] = {
1484 &ceph_other_xattr_handler,
1485 NULL,
1486};