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Merge tag 'regmap-fix-v5.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux/fpc-iii.git] / fs / ceph / xattr.c
blob24997982de0164cce8ea2945df25c23c83795cf0
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
18 static int __remove_xattr(struct ceph_inode_info *ci,
19 struct ceph_inode_xattr *xattr);
20
21 static 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 */
33 struct 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
49 static 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
57 static 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 */
120 static __printf(3, 4)
121 int 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
142 static 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
148 static 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
154 static 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
160 static 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
182 static 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
199 static 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
205 static 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
211 static 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
217 static 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
224 static 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
230 static 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
236 static ssize_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val,
237 size_t size)
238 {
239 return ceph_fmt_xattr(val, size, "%lld", ci->i_rbytes);
240 }
241
242 static ssize_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val,
243 size_t size)
244 {
245 return ceph_fmt_xattr(val, size, "%lld.%09ld", ci->i_rctime.tv_sec,
246 ci->i_rctime.tv_nsec);
247 }
248
249 /* dir pin */
250 static bool ceph_vxattrcb_dir_pin_exists(struct ceph_inode_info *ci)
251 {
252 return ci->i_dir_pin != -ENODATA;
253 }
254
255 static ssize_t ceph_vxattrcb_dir_pin(struct ceph_inode_info *ci, char *val,
256 size_t size)
257 {
258 return ceph_fmt_xattr(val, size, "%d", (int)ci->i_dir_pin);
259 }
260
261 /* quotas */
262 static bool ceph_vxattrcb_quota_exists(struct ceph_inode_info *ci)
263 {
264 bool ret = false;
265 spin_lock(&ci->i_ceph_lock);
266 if ((ci->i_max_files || ci->i_max_bytes) &&
267 ci->i_vino.snap == CEPH_NOSNAP &&
268 ci->i_snap_realm &&
269 ci->i_snap_realm->ino == ci->i_vino.ino)
270 ret = true;
271 spin_unlock(&ci->i_ceph_lock);
272 return ret;
273 }
274
275 static ssize_t ceph_vxattrcb_quota(struct ceph_inode_info *ci, char *val,
276 size_t size)
277 {
278 return ceph_fmt_xattr(val, size, "max_bytes=%llu max_files=%llu",
279 ci->i_max_bytes, ci->i_max_files);
280 }
281
282 static ssize_t ceph_vxattrcb_quota_max_bytes(struct ceph_inode_info *ci,
283 char *val, size_t size)
284 {
285 return ceph_fmt_xattr(val, size, "%llu", ci->i_max_bytes);
286 }
287
288 static ssize_t ceph_vxattrcb_quota_max_files(struct ceph_inode_info *ci,
289 char *val, size_t size)
290 {
291 return ceph_fmt_xattr(val, size, "%llu", ci->i_max_files);
292 }
293
294 /* snapshots */
295 static bool ceph_vxattrcb_snap_btime_exists(struct ceph_inode_info *ci)
296 {
297 return (ci->i_snap_btime.tv_sec != 0 || ci->i_snap_btime.tv_nsec != 0);
298 }
299
300 static ssize_t ceph_vxattrcb_snap_btime(struct ceph_inode_info *ci, char *val,
301 size_t size)
302 {
303 return ceph_fmt_xattr(val, size, "%lld.%09ld", ci->i_snap_btime.tv_sec,
304 ci->i_snap_btime.tv_nsec);
305 }
306
307 static ssize_t ceph_vxattrcb_cluster_fsid(struct ceph_inode_info *ci,
308 char *val, size_t size)
309 {
310 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
311
312 return ceph_fmt_xattr(val, size, "%pU", &fsc->client->fsid);
313 }
314
315 static ssize_t ceph_vxattrcb_client_id(struct ceph_inode_info *ci,
316 char *val, size_t size)
317 {
318 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
319
320 return ceph_fmt_xattr(val, size, "client%lld",
321 ceph_client_gid(fsc->client));
322 }
323
324 static ssize_t ceph_vxattrcb_caps(struct ceph_inode_info *ci, char *val,
325 size_t size)
326 {
327 int issued;
328
329 spin_lock(&ci->i_ceph_lock);
330 issued = __ceph_caps_issued(ci, NULL);
331 spin_unlock(&ci->i_ceph_lock);
332
333 return ceph_fmt_xattr(val, size, "%s/0x%x",
334 ceph_cap_string(issued), issued);
335 }
336
337 #define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name
338 #define CEPH_XATTR_NAME2(_type, _name, _name2) \
339 XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
340
341 #define XATTR_NAME_CEPH(_type, _name, _flags) \
342 { \
343 .name = CEPH_XATTR_NAME(_type, _name), \
344 .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \
345 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
346 .exists_cb = NULL, \
347 .flags = (VXATTR_FLAG_READONLY | _flags), \
348 }
349 #define XATTR_RSTAT_FIELD(_type, _name) \
350 XATTR_NAME_CEPH(_type, _name, VXATTR_FLAG_RSTAT)
351 #define XATTR_LAYOUT_FIELD(_type, _name, _field) \
352 { \
353 .name = CEPH_XATTR_NAME2(_type, _name, _field), \
354 .name_size = sizeof (CEPH_XATTR_NAME2(_type, _name, _field)), \
355 .getxattr_cb = ceph_vxattrcb_ ## _name ## _ ## _field, \
356 .exists_cb = ceph_vxattrcb_layout_exists, \
357 .flags = VXATTR_FLAG_HIDDEN, \
358 }
359 #define XATTR_QUOTA_FIELD(_type, _name) \
360 { \
361 .name = CEPH_XATTR_NAME(_type, _name), \
362 .name_size = sizeof(CEPH_XATTR_NAME(_type, _name)), \
363 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
364 .exists_cb = ceph_vxattrcb_quota_exists, \
365 .flags = VXATTR_FLAG_HIDDEN, \
366 }
367
368 static struct ceph_vxattr ceph_dir_vxattrs[] = {
369 {
370 .name = "ceph.dir.layout",
371 .name_size = sizeof("ceph.dir.layout"),
372 .getxattr_cb = ceph_vxattrcb_layout,
373 .exists_cb = ceph_vxattrcb_layout_exists,
374 .flags = VXATTR_FLAG_HIDDEN,
375 },
376 XATTR_LAYOUT_FIELD(dir, layout, stripe_unit),
377 XATTR_LAYOUT_FIELD(dir, layout, stripe_count),
378 XATTR_LAYOUT_FIELD(dir, layout, object_size),
379 XATTR_LAYOUT_FIELD(dir, layout, pool),
380 XATTR_LAYOUT_FIELD(dir, layout, pool_namespace),
381 XATTR_NAME_CEPH(dir, entries, VXATTR_FLAG_DIRSTAT),
382 XATTR_NAME_CEPH(dir, files, VXATTR_FLAG_DIRSTAT),
383 XATTR_NAME_CEPH(dir, subdirs, VXATTR_FLAG_DIRSTAT),
384 XATTR_RSTAT_FIELD(dir, rentries),
385 XATTR_RSTAT_FIELD(dir, rfiles),
386 XATTR_RSTAT_FIELD(dir, rsubdirs),
387 XATTR_RSTAT_FIELD(dir, rbytes),
388 XATTR_RSTAT_FIELD(dir, rctime),
389 {
390 .name = "ceph.dir.pin",
391 .name_size = sizeof("ceph.dir.pin"),
392 .getxattr_cb = ceph_vxattrcb_dir_pin,
393 .exists_cb = ceph_vxattrcb_dir_pin_exists,
394 .flags = VXATTR_FLAG_HIDDEN,
395 },
396 {
397 .name = "ceph.quota",
398 .name_size = sizeof("ceph.quota"),
399 .getxattr_cb = ceph_vxattrcb_quota,
400 .exists_cb = ceph_vxattrcb_quota_exists,
401 .flags = VXATTR_FLAG_HIDDEN,
402 },
403 XATTR_QUOTA_FIELD(quota, max_bytes),
404 XATTR_QUOTA_FIELD(quota, max_files),
405 {
406 .name = "ceph.snap.btime",
407 .name_size = sizeof("ceph.snap.btime"),
408 .getxattr_cb = ceph_vxattrcb_snap_btime,
409 .exists_cb = ceph_vxattrcb_snap_btime_exists,
410 .flags = VXATTR_FLAG_READONLY,
411 },
412 {
413 .name = "ceph.caps",
414 .name_size = sizeof("ceph.caps"),
415 .getxattr_cb = ceph_vxattrcb_caps,
416 .exists_cb = NULL,
417 .flags = VXATTR_FLAG_HIDDEN,
418 },
419 { .name = NULL, 0 } /* Required table terminator */
420 };
421
422 /* files */
423
424 static struct ceph_vxattr ceph_file_vxattrs[] = {
425 {
426 .name = "ceph.file.layout",
427 .name_size = sizeof("ceph.file.layout"),
428 .getxattr_cb = ceph_vxattrcb_layout,
429 .exists_cb = ceph_vxattrcb_layout_exists,
430 .flags = VXATTR_FLAG_HIDDEN,
431 },
432 XATTR_LAYOUT_FIELD(file, layout, stripe_unit),
433 XATTR_LAYOUT_FIELD(file, layout, stripe_count),
434 XATTR_LAYOUT_FIELD(file, layout, object_size),
435 XATTR_LAYOUT_FIELD(file, layout, pool),
436 XATTR_LAYOUT_FIELD(file, layout, pool_namespace),
437 {
438 .name = "ceph.snap.btime",
439 .name_size = sizeof("ceph.snap.btime"),
440 .getxattr_cb = ceph_vxattrcb_snap_btime,
441 .exists_cb = ceph_vxattrcb_snap_btime_exists,
442 .flags = VXATTR_FLAG_READONLY,
443 },
444 {
445 .name = "ceph.caps",
446 .name_size = sizeof("ceph.caps"),
447 .getxattr_cb = ceph_vxattrcb_caps,
448 .exists_cb = NULL,
449 .flags = VXATTR_FLAG_HIDDEN,
450 },
451 { .name = NULL, 0 } /* Required table terminator */
452 };
453
454 static struct ceph_vxattr ceph_common_vxattrs[] = {
455 {
456 .name = "ceph.cluster_fsid",
457 .name_size = sizeof("ceph.cluster_fsid"),
458 .getxattr_cb = ceph_vxattrcb_cluster_fsid,
459 .exists_cb = NULL,
460 .flags = VXATTR_FLAG_READONLY,
461 },
462 {
463 .name = "ceph.client_id",
464 .name_size = sizeof("ceph.client_id"),
465 .getxattr_cb = ceph_vxattrcb_client_id,
466 .exists_cb = NULL,
467 .flags = VXATTR_FLAG_READONLY,
468 },
469 { .name = NULL, 0 } /* Required table terminator */
470 };
471
472 static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode)
473 {
474 if (S_ISDIR(inode->i_mode))
475 return ceph_dir_vxattrs;
476 else if (S_ISREG(inode->i_mode))
477 return ceph_file_vxattrs;
478 return NULL;
479 }
480
481 static struct ceph_vxattr *ceph_match_vxattr(struct inode *inode,
482 const char *name)
483 {
484 struct ceph_vxattr *vxattr = ceph_inode_vxattrs(inode);
485
486 if (vxattr) {
487 while (vxattr->name) {
488 if (!strcmp(vxattr->name, name))
489 return vxattr;
490 vxattr++;
491 }
492 }
493
494 vxattr = ceph_common_vxattrs;
495 while (vxattr->name) {
496 if (!strcmp(vxattr->name, name))
497 return vxattr;
498 vxattr++;
499 }
500
501 return NULL;
502 }
503
504 static int __set_xattr(struct ceph_inode_info *ci,
505 const char *name, int name_len,
506 const char *val, int val_len,
507 int flags, int update_xattr,
508 struct ceph_inode_xattr **newxattr)
509 {
510 struct rb_node **p;
511 struct rb_node *parent = NULL;
512 struct ceph_inode_xattr *xattr = NULL;
513 int c;
514 int new = 0;
515
516 p = &ci->i_xattrs.index.rb_node;
517 while (*p) {
518 parent = *p;
519 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
520 c = strncmp(name, xattr->name, min(name_len, xattr->name_len));
521 if (c < 0)
522 p = &(*p)->rb_left;
523 else if (c > 0)
524 p = &(*p)->rb_right;
525 else {
526 if (name_len == xattr->name_len)
527 break;
528 else if (name_len < xattr->name_len)
529 p = &(*p)->rb_left;
530 else
531 p = &(*p)->rb_right;
532 }
533 xattr = NULL;
534 }
535
536 if (update_xattr) {
537 int err = 0;
538
539 if (xattr && (flags & XATTR_CREATE))
540 err = -EEXIST;
541 else if (!xattr && (flags & XATTR_REPLACE))
542 err = -ENODATA;
543 if (err) {
544 kfree(name);
545 kfree(val);
546 kfree(*newxattr);
547 return err;
548 }
549 if (update_xattr < 0) {
550 if (xattr)
551 __remove_xattr(ci, xattr);
552 kfree(name);
553 kfree(*newxattr);
554 return 0;
555 }
556 }
557
558 if (!xattr) {
559 new = 1;
560 xattr = *newxattr;
561 xattr->name = name;
562 xattr->name_len = name_len;
563 xattr->should_free_name = update_xattr;
564
565 ci->i_xattrs.count++;
566 dout("__set_xattr count=%d\n", ci->i_xattrs.count);
567 } else {
568 kfree(*newxattr);
569 *newxattr = NULL;
570 if (xattr->should_free_val)
571 kfree(xattr->val);
572
573 if (update_xattr) {
574 kfree(name);
575 name = xattr->name;
576 }
577 ci->i_xattrs.names_size -= xattr->name_len;
578 ci->i_xattrs.vals_size -= xattr->val_len;
579 }
580 ci->i_xattrs.names_size += name_len;
581 ci->i_xattrs.vals_size += val_len;
582 if (val)
583 xattr->val = val;
584 else
585 xattr->val = "";
586
587 xattr->val_len = val_len;
588 xattr->dirty = update_xattr;
589 xattr->should_free_val = (val && update_xattr);
590
591 if (new) {
592 rb_link_node(&xattr->node, parent, p);
593 rb_insert_color(&xattr->node, &ci->i_xattrs.index);
594 dout("__set_xattr_val p=%p\n", p);
595 }
596
597 dout("__set_xattr_val added %llx.%llx xattr %p %.*s=%.*s\n",
598 ceph_vinop(&ci->vfs_inode), xattr, name_len, name, val_len, val);
599
600 return 0;
601 }
602
603 static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci,
604 const char *name)
605 {
606 struct rb_node **p;
607 struct rb_node *parent = NULL;
608 struct ceph_inode_xattr *xattr = NULL;
609 int name_len = strlen(name);
610 int c;
611
612 p = &ci->i_xattrs.index.rb_node;
613 while (*p) {
614 parent = *p;
615 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
616 c = strncmp(name, xattr->name, xattr->name_len);
617 if (c == 0 && name_len > xattr->name_len)
618 c = 1;
619 if (c < 0)
620 p = &(*p)->rb_left;
621 else if (c > 0)
622 p = &(*p)->rb_right;
623 else {
624 dout("__get_xattr %s: found %.*s\n", name,
625 xattr->val_len, xattr->val);
626 return xattr;
627 }
628 }
629
630 dout("__get_xattr %s: not found\n", name);
631
632 return NULL;
633 }
634
635 static void __free_xattr(struct ceph_inode_xattr *xattr)
636 {
637 BUG_ON(!xattr);
638
639 if (xattr->should_free_name)
640 kfree(xattr->name);
641 if (xattr->should_free_val)
642 kfree(xattr->val);
643
644 kfree(xattr);
645 }
646
647 static int __remove_xattr(struct ceph_inode_info *ci,
648 struct ceph_inode_xattr *xattr)
649 {
650 if (!xattr)
651 return -ENODATA;
652
653 rb_erase(&xattr->node, &ci->i_xattrs.index);
654
655 if (xattr->should_free_name)
656 kfree(xattr->name);
657 if (xattr->should_free_val)
658 kfree(xattr->val);
659
660 ci->i_xattrs.names_size -= xattr->name_len;
661 ci->i_xattrs.vals_size -= xattr->val_len;
662 ci->i_xattrs.count--;
663 kfree(xattr);
664
665 return 0;
666 }
667
668 static char *__copy_xattr_names(struct ceph_inode_info *ci,
669 char *dest)
670 {
671 struct rb_node *p;
672 struct ceph_inode_xattr *xattr = NULL;
673
674 p = rb_first(&ci->i_xattrs.index);
675 dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count);
676
677 while (p) {
678 xattr = rb_entry(p, struct ceph_inode_xattr, node);
679 memcpy(dest, xattr->name, xattr->name_len);
680 dest[xattr->name_len] = '\0';
681
682 dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name,
683 xattr->name_len, ci->i_xattrs.names_size);
684
685 dest += xattr->name_len + 1;
686 p = rb_next(p);
687 }
688
689 return dest;
690 }
691
692 void __ceph_destroy_xattrs(struct ceph_inode_info *ci)
693 {
694 struct rb_node *p, *tmp;
695 struct ceph_inode_xattr *xattr = NULL;
696
697 p = rb_first(&ci->i_xattrs.index);
698
699 dout("__ceph_destroy_xattrs p=%p\n", p);
700
701 while (p) {
702 xattr = rb_entry(p, struct ceph_inode_xattr, node);
703 tmp = p;
704 p = rb_next(tmp);
705 dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p,
706 xattr->name_len, xattr->name);
707 rb_erase(tmp, &ci->i_xattrs.index);
708
709 __free_xattr(xattr);
710 }
711
712 ci->i_xattrs.names_size = 0;
713 ci->i_xattrs.vals_size = 0;
714 ci->i_xattrs.index_version = 0;
715 ci->i_xattrs.count = 0;
716 ci->i_xattrs.index = RB_ROOT;
717 }
718
719 static int __build_xattrs(struct inode *inode)
720 __releases(ci->i_ceph_lock)
721 __acquires(ci->i_ceph_lock)
722 {
723 u32 namelen;
724 u32 numattr = 0;
725 void *p, *end;
726 u32 len;
727 const char *name, *val;
728 struct ceph_inode_info *ci = ceph_inode(inode);
729 u64 xattr_version;
730 struct ceph_inode_xattr **xattrs = NULL;
731 int err = 0;
732 int i;
733
734 dout("__build_xattrs() len=%d\n",
735 ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0);
736
737 if (ci->i_xattrs.index_version >= ci->i_xattrs.version)
738 return 0; /* already built */
739
740 __ceph_destroy_xattrs(ci);
741
742 start:
743 /* updated internal xattr rb tree */
744 if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) {
745 p = ci->i_xattrs.blob->vec.iov_base;
746 end = p + ci->i_xattrs.blob->vec.iov_len;
747 ceph_decode_32_safe(&p, end, numattr, bad);
748 xattr_version = ci->i_xattrs.version;
749 spin_unlock(&ci->i_ceph_lock);
750
751 xattrs = kcalloc(numattr, sizeof(struct ceph_inode_xattr *),
752 GFP_NOFS);
753 err = -ENOMEM;
754 if (!xattrs)
755 goto bad_lock;
756
757 for (i = 0; i < numattr; i++) {
758 xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr),
759 GFP_NOFS);
760 if (!xattrs[i])
761 goto bad_lock;
762 }
763
764 spin_lock(&ci->i_ceph_lock);
765 if (ci->i_xattrs.version != xattr_version) {
766 /* lost a race, retry */
767 for (i = 0; i < numattr; i++)
768 kfree(xattrs[i]);
769 kfree(xattrs);
770 xattrs = NULL;
771 goto start;
772 }
773 err = -EIO;
774 while (numattr--) {
775 ceph_decode_32_safe(&p, end, len, bad);
776 namelen = len;
777 name = p;
778 p += len;
779 ceph_decode_32_safe(&p, end, len, bad);
780 val = p;
781 p += len;
782
783 err = __set_xattr(ci, name, namelen, val, len,
784 0, 0, &xattrs[numattr]);
785
786 if (err < 0)
787 goto bad;
788 }
789 kfree(xattrs);
790 }
791 ci->i_xattrs.index_version = ci->i_xattrs.version;
792 ci->i_xattrs.dirty = false;
793
794 return err;
795 bad_lock:
796 spin_lock(&ci->i_ceph_lock);
797 bad:
798 if (xattrs) {
799 for (i = 0; i < numattr; i++)
800 kfree(xattrs[i]);
801 kfree(xattrs);
802 }
803 ci->i_xattrs.names_size = 0;
804 return err;
805 }
806
807 static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size,
808 int val_size)
809 {
810 /*
811 * 4 bytes for the length, and additional 4 bytes per each xattr name,
812 * 4 bytes per each value
813 */
814 int size = 4 + ci->i_xattrs.count*(4 + 4) +
815 ci->i_xattrs.names_size +
816 ci->i_xattrs.vals_size;
817 dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n",
818 ci->i_xattrs.count, ci->i_xattrs.names_size,
819 ci->i_xattrs.vals_size);
820
821 if (name_size)
822 size += 4 + 4 + name_size + val_size;
823
824 return size;
825 }
826
827 /*
828 * If there are dirty xattrs, reencode xattrs into the prealloc_blob
829 * and swap into place. It returns the old i_xattrs.blob (or NULL) so
830 * that it can be freed by the caller as the i_ceph_lock is likely to be
831 * held.
832 */
833 struct ceph_buffer *__ceph_build_xattrs_blob(struct ceph_inode_info *ci)
834 {
835 struct rb_node *p;
836 struct ceph_inode_xattr *xattr = NULL;
837 struct ceph_buffer *old_blob = NULL;
838 void *dest;
839
840 dout("__build_xattrs_blob %p\n", &ci->vfs_inode);
841 if (ci->i_xattrs.dirty) {
842 int need = __get_required_blob_size(ci, 0, 0);
843
844 BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len);
845
846 p = rb_first(&ci->i_xattrs.index);
847 dest = ci->i_xattrs.prealloc_blob->vec.iov_base;
848
849 ceph_encode_32(&dest, ci->i_xattrs.count);
850 while (p) {
851 xattr = rb_entry(p, struct ceph_inode_xattr, node);
852
853 ceph_encode_32(&dest, xattr->name_len);
854 memcpy(dest, xattr->name, xattr->name_len);
855 dest += xattr->name_len;
856 ceph_encode_32(&dest, xattr->val_len);
857 memcpy(dest, xattr->val, xattr->val_len);
858 dest += xattr->val_len;
859
860 p = rb_next(p);
861 }
862
863 /* adjust buffer len; it may be larger than we need */
864 ci->i_xattrs.prealloc_blob->vec.iov_len =
865 dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
866
867 if (ci->i_xattrs.blob)
868 old_blob = ci->i_xattrs.blob;
869 ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
870 ci->i_xattrs.prealloc_blob = NULL;
871 ci->i_xattrs.dirty = false;
872 ci->i_xattrs.version++;
873 }
874
875 return old_blob;
876 }
877
878 static inline int __get_request_mask(struct inode *in) {
879 struct ceph_mds_request *req = current->journal_info;
880 int mask = 0;
881 if (req && req->r_target_inode == in) {
882 if (req->r_op == CEPH_MDS_OP_LOOKUP ||
883 req->r_op == CEPH_MDS_OP_LOOKUPINO ||
884 req->r_op == CEPH_MDS_OP_LOOKUPPARENT ||
885 req->r_op == CEPH_MDS_OP_GETATTR) {
886 mask = le32_to_cpu(req->r_args.getattr.mask);
887 } else if (req->r_op == CEPH_MDS_OP_OPEN ||
888 req->r_op == CEPH_MDS_OP_CREATE) {
889 mask = le32_to_cpu(req->r_args.open.mask);
890 }
891 }
892 return mask;
893 }
894
895 ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
896 size_t size)
897 {
898 struct ceph_inode_info *ci = ceph_inode(inode);
899 struct ceph_inode_xattr *xattr;
900 struct ceph_vxattr *vxattr = NULL;
901 int req_mask;
902 ssize_t err;
903
904 /* let's see if a virtual xattr was requested */
905 vxattr = ceph_match_vxattr(inode, name);
906 if (vxattr) {
907 int mask = 0;
908 if (vxattr->flags & VXATTR_FLAG_RSTAT)
909 mask |= CEPH_STAT_RSTAT;
910 if (vxattr->flags & VXATTR_FLAG_DIRSTAT)
911 mask |= CEPH_CAP_FILE_SHARED;
912 err = ceph_do_getattr(inode, mask, true);
913 if (err)
914 return err;
915 err = -ENODATA;
916 if (!(vxattr->exists_cb && !vxattr->exists_cb(ci))) {
917 err = vxattr->getxattr_cb(ci, value, size);
918 if (size && size < err)
919 err = -ERANGE;
920 }
921 return err;
922 }
923
924 req_mask = __get_request_mask(inode);
925
926 spin_lock(&ci->i_ceph_lock);
927 dout("getxattr %p name '%s' ver=%lld index_ver=%lld\n", inode, name,
928 ci->i_xattrs.version, ci->i_xattrs.index_version);
929
930 if (ci->i_xattrs.version == 0 ||
931 !((req_mask & CEPH_CAP_XATTR_SHARED) ||
932 __ceph_caps_issued_mask_metric(ci, CEPH_CAP_XATTR_SHARED, 1))) {
933 spin_unlock(&ci->i_ceph_lock);
934
935 /* security module gets xattr while filling trace */
936 if (current->journal_info) {
937 pr_warn_ratelimited("sync getxattr %p "
938 "during filling trace\n", inode);
939 return -EBUSY;
940 }
941
942 /* get xattrs from mds (if we don't already have them) */
943 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
944 if (err)
945 return err;
946 spin_lock(&ci->i_ceph_lock);
947 }
948
949 err = __build_xattrs(inode);
950 if (err < 0)
951 goto out;
952
953 err = -ENODATA; /* == ENOATTR */
954 xattr = __get_xattr(ci, name);
955 if (!xattr)
956 goto out;
957
958 err = -ERANGE;
959 if (size && size < xattr->val_len)
960 goto out;
961
962 err = xattr->val_len;
963 if (size == 0)
964 goto out;
965
966 memcpy(value, xattr->val, xattr->val_len);
967
968 if (current->journal_info &&
969 !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) &&
970 security_ismaclabel(name + XATTR_SECURITY_PREFIX_LEN))
971 ci->i_ceph_flags |= CEPH_I_SEC_INITED;
972 out:
973 spin_unlock(&ci->i_ceph_lock);
974 return err;
975 }
976
977 ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
978 {
979 struct inode *inode = d_inode(dentry);
980 struct ceph_inode_info *ci = ceph_inode(inode);
981 bool len_only = (size == 0);
982 u32 namelen;
983 int err;
984
985 spin_lock(&ci->i_ceph_lock);
986 dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
987 ci->i_xattrs.version, ci->i_xattrs.index_version);
988
989 if (ci->i_xattrs.version == 0 ||
990 !__ceph_caps_issued_mask_metric(ci, CEPH_CAP_XATTR_SHARED, 1)) {
991 spin_unlock(&ci->i_ceph_lock);
992 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
993 if (err)
994 return err;
995 spin_lock(&ci->i_ceph_lock);
996 }
997
998 err = __build_xattrs(inode);
999 if (err < 0)
1000 goto out;
1001
1002 /* add 1 byte for each xattr due to the null termination */
1003 namelen = ci->i_xattrs.names_size + ci->i_xattrs.count;
1004 if (!len_only) {
1005 if (namelen > size) {
1006 err = -ERANGE;
1007 goto out;
1008 }
1009 names = __copy_xattr_names(ci, names);
1010 size -= namelen;
1011 }
1012 err = namelen;
1013 out:
1014 spin_unlock(&ci->i_ceph_lock);
1015 return err;
1016 }
1017
1018 static int ceph_sync_setxattr(struct inode *inode, const char *name,
1019 const char *value, size_t size, int flags)
1020 {
1021 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1022 struct ceph_inode_info *ci = ceph_inode(inode);
1023 struct ceph_mds_request *req;
1024 struct ceph_mds_client *mdsc = fsc->mdsc;
1025 struct ceph_osd_client *osdc = &fsc->client->osdc;
1026 struct ceph_pagelist *pagelist = NULL;
1027 int op = CEPH_MDS_OP_SETXATTR;
1028 int err;
1029
1030 if (size > 0) {
1031 /* copy value into pagelist */
1032 pagelist = ceph_pagelist_alloc(GFP_NOFS);
1033 if (!pagelist)
1034 return -ENOMEM;
1035
1036 err = ceph_pagelist_append(pagelist, value, size);
1037 if (err)
1038 goto out;
1039 } else if (!value) {
1040 if (flags & CEPH_XATTR_REPLACE)
1041 op = CEPH_MDS_OP_RMXATTR;
1042 else
1043 flags |= CEPH_XATTR_REMOVE;
1044 }
1045
1046 dout("setxattr value=%.*s\n", (int)size, value);
1047
1048 /* do request */
1049 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
1050 if (IS_ERR(req)) {
1051 err = PTR_ERR(req);
1052 goto out;
1053 }
1054
1055 req->r_path2 = kstrdup(name, GFP_NOFS);
1056 if (!req->r_path2) {
1057 ceph_mdsc_put_request(req);
1058 err = -ENOMEM;
1059 goto out;
1060 }
1061
1062 if (op == CEPH_MDS_OP_SETXATTR) {
1063 req->r_args.setxattr.flags = cpu_to_le32(flags);
1064 req->r_args.setxattr.osdmap_epoch =
1065 cpu_to_le32(osdc->osdmap->epoch);
1066 req->r_pagelist = pagelist;
1067 pagelist = NULL;
1068 }
1069
1070 req->r_inode = inode;
1071 ihold(inode);
1072 req->r_num_caps = 1;
1073 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
1074
1075 dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
1076 err = ceph_mdsc_do_request(mdsc, NULL, req);
1077 ceph_mdsc_put_request(req);
1078 dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
1079
1080 out:
1081 if (pagelist)
1082 ceph_pagelist_release(pagelist);
1083 return err;
1084 }
1085
1086 int __ceph_setxattr(struct inode *inode, const char *name,
1087 const void *value, size_t size, int flags)
1088 {
1089 struct ceph_vxattr *vxattr;
1090 struct ceph_inode_info *ci = ceph_inode(inode);
1091 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1092 struct ceph_cap_flush *prealloc_cf = NULL;
1093 struct ceph_buffer *old_blob = NULL;
1094 int issued;
1095 int err;
1096 int dirty = 0;
1097 int name_len = strlen(name);
1098 int val_len = size;
1099 char *newname = NULL;
1100 char *newval = NULL;
1101 struct ceph_inode_xattr *xattr = NULL;
1102 int required_blob_size;
1103 bool check_realm = false;
1104 bool lock_snap_rwsem = false;
1105
1106 if (ceph_snap(inode) != CEPH_NOSNAP)
1107 return -EROFS;
1108
1109 vxattr = ceph_match_vxattr(inode, name);
1110 if (vxattr) {
1111 if (vxattr->flags & VXATTR_FLAG_READONLY)
1112 return -EOPNOTSUPP;
1113 if (value && !strncmp(vxattr->name, "ceph.quota", 10))
1114 check_realm = true;
1115 }
1116
1117 /* pass any unhandled ceph.* xattrs through to the MDS */
1118 if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
1119 goto do_sync_unlocked;
1120
1121 /* preallocate memory for xattr name, value, index node */
1122 err = -ENOMEM;
1123 newname = kmemdup(name, name_len + 1, GFP_NOFS);
1124 if (!newname)
1125 goto out;
1126
1127 if (val_len) {
1128 newval = kmemdup(value, val_len, GFP_NOFS);
1129 if (!newval)
1130 goto out;
1131 }
1132
1133 xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS);
1134 if (!xattr)
1135 goto out;
1136
1137 prealloc_cf = ceph_alloc_cap_flush();
1138 if (!prealloc_cf)
1139 goto out;
1140
1141 spin_lock(&ci->i_ceph_lock);
1142 retry:
1143 issued = __ceph_caps_issued(ci, NULL);
1144 if (ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))
1145 goto do_sync;
1146
1147 if (!lock_snap_rwsem && !ci->i_head_snapc) {
1148 lock_snap_rwsem = true;
1149 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1150 spin_unlock(&ci->i_ceph_lock);
1151 down_read(&mdsc->snap_rwsem);
1152 spin_lock(&ci->i_ceph_lock);
1153 goto retry;
1154 }
1155 }
1156
1157 dout("setxattr %p name '%s' issued %s\n", inode, name,
1158 ceph_cap_string(issued));
1159 __build_xattrs(inode);
1160
1161 required_blob_size = __get_required_blob_size(ci, name_len, val_len);
1162
1163 if (!ci->i_xattrs.prealloc_blob ||
1164 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
1165 struct ceph_buffer *blob;
1166
1167 spin_unlock(&ci->i_ceph_lock);
1168 ceph_buffer_put(old_blob); /* Shouldn't be required */
1169 dout(" pre-allocating new blob size=%d\n", required_blob_size);
1170 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
1171 if (!blob)
1172 goto do_sync_unlocked;
1173 spin_lock(&ci->i_ceph_lock);
1174 /* prealloc_blob can't be released while holding i_ceph_lock */
1175 if (ci->i_xattrs.prealloc_blob)
1176 old_blob = ci->i_xattrs.prealloc_blob;
1177 ci->i_xattrs.prealloc_blob = blob;
1178 goto retry;
1179 }
1180
1181 err = __set_xattr(ci, newname, name_len, newval, val_len,
1182 flags, value ? 1 : -1, &xattr);
1183
1184 if (!err) {
1185 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL,
1186 &prealloc_cf);
1187 ci->i_xattrs.dirty = true;
1188 inode->i_ctime = current_time(inode);
1189 }
1190
1191 spin_unlock(&ci->i_ceph_lock);
1192 ceph_buffer_put(old_blob);
1193 if (lock_snap_rwsem)
1194 up_read(&mdsc->snap_rwsem);
1195 if (dirty)
1196 __mark_inode_dirty(inode, dirty);
1197 ceph_free_cap_flush(prealloc_cf);
1198 return err;
1199
1200 do_sync:
1201 spin_unlock(&ci->i_ceph_lock);
1202 do_sync_unlocked:
1203 if (lock_snap_rwsem)
1204 up_read(&mdsc->snap_rwsem);
1205
1206 /* security module set xattr while filling trace */
1207 if (current->journal_info) {
1208 pr_warn_ratelimited("sync setxattr %p "
1209 "during filling trace\n", inode);
1210 err = -EBUSY;
1211 } else {
1212 err = ceph_sync_setxattr(inode, name, value, size, flags);
1213 if (err >= 0 && check_realm) {
1214 /* check if snaprealm was created for quota inode */
1215 spin_lock(&ci->i_ceph_lock);
1216 if ((ci->i_max_files || ci->i_max_bytes) &&
1217 !(ci->i_snap_realm &&
1218 ci->i_snap_realm->ino == ci->i_vino.ino))
1219 err = -EOPNOTSUPP;
1220 spin_unlock(&ci->i_ceph_lock);
1221 }
1222 }
1223 out:
1224 ceph_free_cap_flush(prealloc_cf);
1225 kfree(newname);
1226 kfree(newval);
1227 kfree(xattr);
1228 return err;
1229 }
1230
1231 static int ceph_get_xattr_handler(const struct xattr_handler *handler,
1232 struct dentry *dentry, struct inode *inode,
1233 const char *name, void *value, size_t size)
1234 {
1235 if (!ceph_is_valid_xattr(name))
1236 return -EOPNOTSUPP;
1237 return __ceph_getxattr(inode, name, value, size);
1238 }
1239
1240 static int ceph_set_xattr_handler(const struct xattr_handler *handler,
1241 struct dentry *unused, struct inode *inode,
1242 const char *name, const void *value,
1243 size_t size, int flags)
1244 {
1245 if (!ceph_is_valid_xattr(name))
1246 return -EOPNOTSUPP;
1247 return __ceph_setxattr(inode, name, value, size, flags);
1248 }
1249
1250 static const struct xattr_handler ceph_other_xattr_handler = {
1251 .prefix = "", /* match any name => handlers called with full name */
1252 .get = ceph_get_xattr_handler,
1253 .set = ceph_set_xattr_handler,
1254 };
1255
1256 #ifdef CONFIG_SECURITY
1257 bool ceph_security_xattr_wanted(struct inode *in)
1258 {
1259 return in->i_security != NULL;
1260 }
1261
1262 bool ceph_security_xattr_deadlock(struct inode *in)
1263 {
1264 struct ceph_inode_info *ci;
1265 bool ret;
1266 if (!in->i_security)
1267 return false;
1268 ci = ceph_inode(in);
1269 spin_lock(&ci->i_ceph_lock);
1270 ret = !(ci->i_ceph_flags & CEPH_I_SEC_INITED) &&
1271 !(ci->i_xattrs.version > 0 &&
1272 __ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0));
1273 spin_unlock(&ci->i_ceph_lock);
1274 return ret;
1275 }
1276
1277 #ifdef CONFIG_CEPH_FS_SECURITY_LABEL
1278 int ceph_security_init_secctx(struct dentry *dentry, umode_t mode,
1279 struct ceph_acl_sec_ctx *as_ctx)
1280 {
1281 struct ceph_pagelist *pagelist = as_ctx->pagelist;
1282 const char *name;
1283 size_t name_len;
1284 int err;
1285
1286 err = security_dentry_init_security(dentry, mode, &dentry->d_name,
1287 &as_ctx->sec_ctx,
1288 &as_ctx->sec_ctxlen);
1289 if (err < 0) {
1290 WARN_ON_ONCE(err != -EOPNOTSUPP);
1291 err = 0; /* do nothing */
1292 goto out;
1293 }
1294
1295 err = -ENOMEM;
1296 if (!pagelist) {
1297 pagelist = ceph_pagelist_alloc(GFP_KERNEL);
1298 if (!pagelist)
1299 goto out;
1300 err = ceph_pagelist_reserve(pagelist, PAGE_SIZE);
1301 if (err)
1302 goto out;
1303 ceph_pagelist_encode_32(pagelist, 1);
1304 }
1305
1306 /*
1307 * FIXME: Make security_dentry_init_security() generic. Currently
1308 * It only supports single security module and only selinux has
1309 * dentry_init_security hook.
1310 */
1311 name = XATTR_NAME_SELINUX;
1312 name_len = strlen(name);
1313 err = ceph_pagelist_reserve(pagelist,
1314 4 * 2 + name_len + as_ctx->sec_ctxlen);
1315 if (err)
1316 goto out;
1317
1318 if (as_ctx->pagelist) {
1319 /* update count of KV pairs */
1320 BUG_ON(pagelist->length <= sizeof(__le32));
1321 if (list_is_singular(&pagelist->head)) {
1322 le32_add_cpu((__le32*)pagelist->mapped_tail, 1);
1323 } else {
1324 struct page *page = list_first_entry(&pagelist->head,
1325 struct page, lru);
1326 void *addr = kmap_atomic(page);
1327 le32_add_cpu((__le32*)addr, 1);
1328 kunmap_atomic(addr);
1329 }
1330 } else {
1331 as_ctx->pagelist = pagelist;
1332 }
1333
1334 ceph_pagelist_encode_32(pagelist, name_len);
1335 ceph_pagelist_append(pagelist, name, name_len);
1336
1337 ceph_pagelist_encode_32(pagelist, as_ctx->sec_ctxlen);
1338 ceph_pagelist_append(pagelist, as_ctx->sec_ctx, as_ctx->sec_ctxlen);
1339
1340 err = 0;
1341 out:
1342 if (pagelist && !as_ctx->pagelist)
1343 ceph_pagelist_release(pagelist);
1344 return err;
1345 }
1346 #endif /* CONFIG_CEPH_FS_SECURITY_LABEL */
1347 #endif /* CONFIG_SECURITY */
1348
1349 void ceph_release_acl_sec_ctx(struct ceph_acl_sec_ctx *as_ctx)
1350 {
1351 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1352 posix_acl_release(as_ctx->acl);
1353 posix_acl_release(as_ctx->default_acl);
1354 #endif
1355 #ifdef CONFIG_CEPH_FS_SECURITY_LABEL
1356 security_release_secctx(as_ctx->sec_ctx, as_ctx->sec_ctxlen);
1357 #endif
1358 if (as_ctx->pagelist)
1359 ceph_pagelist_release(as_ctx->pagelist);
1360 }
1361
1362 /*
1363 * List of handlers for synthetic system.* attributes. Other
1364 * attributes are handled directly.
1365 */
1366 const struct xattr_handler *ceph_xattr_handlers[] = {
1367 #ifdef CONFIG_CEPH_FS_POSIX_ACL
1368 &posix_acl_access_xattr_handler,
1369 &posix_acl_default_xattr_handler,
1370 #endif
1371 &ceph_other_xattr_handler,
1372 NULL,
1373 };
Linux with added FPC-III support