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Merge tag 'afs-fixes-20171201' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowe...
[linux/fpc-iii.git] / fs / ceph / xattr.c
blobe1c4e0b12b4cd1309af51bad916120c7f2273fc4
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/posix_acl_xattr.h>
12 #include <linux/slab.h>
13
14 #define XATTR_CEPH_PREFIX "ceph."
15 #define XATTR_CEPH_PREFIX_LEN (sizeof (XATTR_CEPH_PREFIX) - 1)
16
17 static int __remove_xattr(struct ceph_inode_info *ci,
18 struct ceph_inode_xattr *xattr);
19
20 static const struct xattr_handler ceph_other_xattr_handler;
21
22 /*
23 * List of handlers for synthetic system.* attributes. Other
24 * attributes are handled directly.
25 */
26 const struct xattr_handler *ceph_xattr_handlers[] = {
27 #ifdef CONFIG_CEPH_FS_POSIX_ACL
28 &posix_acl_access_xattr_handler,
29 &posix_acl_default_xattr_handler,
30 #endif
31 &ceph_other_xattr_handler,
32 NULL,
33 };
34
35 static bool ceph_is_valid_xattr(const char *name)
36 {
37 return !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) ||
38 !strncmp(name, XATTR_SECURITY_PREFIX,
39 XATTR_SECURITY_PREFIX_LEN) ||
40 !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) ||
41 !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
42 }
43
44 /*
45 * These define virtual xattrs exposing the recursive directory
46 * statistics and layout metadata.
47 */
48 struct ceph_vxattr {
49 char *name;
50 size_t name_size; /* strlen(name) + 1 (for '\0') */
51 size_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val,
52 size_t size);
53 bool readonly, hidden;
54 bool (*exists_cb)(struct ceph_inode_info *ci);
55 };
56
57 /* layouts */
58
59 static bool ceph_vxattrcb_layout_exists(struct ceph_inode_info *ci)
60 {
61 struct ceph_file_layout *fl = &ci->i_layout;
62 return (fl->stripe_unit > 0 || fl->stripe_count > 0 ||
63 fl->object_size > 0 || fl->pool_id >= 0 ||
64 rcu_dereference_raw(fl->pool_ns) != NULL);
65 }
66
67 static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
68 size_t size)
69 {
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 struct ceph_string *pool_ns;
73 s64 pool = ci->i_layout.pool_id;
74 const char *pool_name;
75 const char *ns_field = " pool_namespace=";
76 char buf[128];
77 size_t len, total_len = 0;
78 int ret;
79
80 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);
81
82 dout("ceph_vxattrcb_layout %p\n", &ci->vfs_inode);
83 down_read(&osdc->lock);
84 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
85 if (pool_name) {
86 len = snprintf(buf, sizeof(buf),
87 "stripe_unit=%u stripe_count=%u object_size=%u pool=",
88 ci->i_layout.stripe_unit, ci->i_layout.stripe_count,
89 ci->i_layout.object_size);
90 total_len = len + strlen(pool_name);
91 } else {
92 len = snprintf(buf, sizeof(buf),
93 "stripe_unit=%u stripe_count=%u object_size=%u pool=%lld",
94 ci->i_layout.stripe_unit, ci->i_layout.stripe_count,
95 ci->i_layout.object_size, (unsigned long long)pool);
96 total_len = len;
97 }
98
99 if (pool_ns)
100 total_len += strlen(ns_field) + pool_ns->len;
101
102 if (!size) {
103 ret = total_len;
104 } else if (total_len > size) {
105 ret = -ERANGE;
106 } else {
107 memcpy(val, buf, len);
108 ret = len;
109 if (pool_name) {
110 len = strlen(pool_name);
111 memcpy(val + ret, pool_name, len);
112 ret += len;
113 }
114 if (pool_ns) {
115 len = strlen(ns_field);
116 memcpy(val + ret, ns_field, len);
117 ret += len;
118 memcpy(val + ret, pool_ns->str, pool_ns->len);
119 ret += pool_ns->len;
120 }
121 }
122 up_read(&osdc->lock);
123 ceph_put_string(pool_ns);
124 return ret;
125 }
126
127 static size_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci,
128 char *val, size_t size)
129 {
130 return snprintf(val, size, "%u", ci->i_layout.stripe_unit);
131 }
132
133 static size_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci,
134 char *val, size_t size)
135 {
136 return snprintf(val, size, "%u", ci->i_layout.stripe_count);
137 }
138
139 static size_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci,
140 char *val, size_t size)
141 {
142 return snprintf(val, size, "%u", ci->i_layout.object_size);
143 }
144
145 static size_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci,
146 char *val, size_t size)
147 {
148 int ret;
149 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
150 struct ceph_osd_client *osdc = &fsc->client->osdc;
151 s64 pool = ci->i_layout.pool_id;
152 const char *pool_name;
153
154 down_read(&osdc->lock);
155 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
156 if (pool_name)
157 ret = snprintf(val, size, "%s", pool_name);
158 else
159 ret = snprintf(val, size, "%lld", (unsigned long long)pool);
160 up_read(&osdc->lock);
161 return ret;
162 }
163
164 static size_t ceph_vxattrcb_layout_pool_namespace(struct ceph_inode_info *ci,
165 char *val, size_t size)
166 {
167 int ret = 0;
168 struct ceph_string *ns = ceph_try_get_string(ci->i_layout.pool_ns);
169 if (ns) {
170 ret = snprintf(val, size, "%.*s", (int)ns->len, ns->str);
171 ceph_put_string(ns);
172 }
173 return ret;
174 }
175
176 /* directories */
177
178 static size_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val,
179 size_t size)
180 {
181 return snprintf(val, size, "%lld", ci->i_files + ci->i_subdirs);
182 }
183
184 static size_t ceph_vxattrcb_dir_files(struct ceph_inode_info *ci, char *val,
185 size_t size)
186 {
187 return snprintf(val, size, "%lld", ci->i_files);
188 }
189
190 static size_t ceph_vxattrcb_dir_subdirs(struct ceph_inode_info *ci, char *val,
191 size_t size)
192 {
193 return snprintf(val, size, "%lld", ci->i_subdirs);
194 }
195
196 static size_t ceph_vxattrcb_dir_rentries(struct ceph_inode_info *ci, char *val,
197 size_t size)
198 {
199 return snprintf(val, size, "%lld", ci->i_rfiles + ci->i_rsubdirs);
200 }
201
202 static size_t ceph_vxattrcb_dir_rfiles(struct ceph_inode_info *ci, char *val,
203 size_t size)
204 {
205 return snprintf(val, size, "%lld", ci->i_rfiles);
206 }
207
208 static size_t ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info *ci, char *val,
209 size_t size)
210 {
211 return snprintf(val, size, "%lld", ci->i_rsubdirs);
212 }
213
214 static size_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val,
215 size_t size)
216 {
217 return snprintf(val, size, "%lld", ci->i_rbytes);
218 }
219
220 static size_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val,
221 size_t size)
222 {
223 return snprintf(val, size, "%ld.09%ld", (long)ci->i_rctime.tv_sec,
224 (long)ci->i_rctime.tv_nsec);
225 }
226
227
228 #define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name
229 #define CEPH_XATTR_NAME2(_type, _name, _name2) \
230 XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
231
232 #define XATTR_NAME_CEPH(_type, _name) \
233 { \
234 .name = CEPH_XATTR_NAME(_type, _name), \
235 .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \
236 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
237 .readonly = true, \
238 .hidden = false, \
239 .exists_cb = NULL, \
240 }
241 #define XATTR_LAYOUT_FIELD(_type, _name, _field) \
242 { \
243 .name = CEPH_XATTR_NAME2(_type, _name, _field), \
244 .name_size = sizeof (CEPH_XATTR_NAME2(_type, _name, _field)), \
245 .getxattr_cb = ceph_vxattrcb_ ## _name ## _ ## _field, \
246 .readonly = false, \
247 .hidden = true, \
248 .exists_cb = ceph_vxattrcb_layout_exists, \
249 }
250
251 static struct ceph_vxattr ceph_dir_vxattrs[] = {
252 {
253 .name = "ceph.dir.layout",
254 .name_size = sizeof("ceph.dir.layout"),
255 .getxattr_cb = ceph_vxattrcb_layout,
256 .readonly = false,
257 .hidden = true,
258 .exists_cb = ceph_vxattrcb_layout_exists,
259 },
260 XATTR_LAYOUT_FIELD(dir, layout, stripe_unit),
261 XATTR_LAYOUT_FIELD(dir, layout, stripe_count),
262 XATTR_LAYOUT_FIELD(dir, layout, object_size),
263 XATTR_LAYOUT_FIELD(dir, layout, pool),
264 XATTR_LAYOUT_FIELD(dir, layout, pool_namespace),
265 XATTR_NAME_CEPH(dir, entries),
266 XATTR_NAME_CEPH(dir, files),
267 XATTR_NAME_CEPH(dir, subdirs),
268 XATTR_NAME_CEPH(dir, rentries),
269 XATTR_NAME_CEPH(dir, rfiles),
270 XATTR_NAME_CEPH(dir, rsubdirs),
271 XATTR_NAME_CEPH(dir, rbytes),
272 XATTR_NAME_CEPH(dir, rctime),
273 { .name = NULL, 0 } /* Required table terminator */
274 };
275 static size_t ceph_dir_vxattrs_name_size; /* total size of all names */
276
277 /* files */
278
279 static struct ceph_vxattr ceph_file_vxattrs[] = {
280 {
281 .name = "ceph.file.layout",
282 .name_size = sizeof("ceph.file.layout"),
283 .getxattr_cb = ceph_vxattrcb_layout,
284 .readonly = false,
285 .hidden = true,
286 .exists_cb = ceph_vxattrcb_layout_exists,
287 },
288 XATTR_LAYOUT_FIELD(file, layout, stripe_unit),
289 XATTR_LAYOUT_FIELD(file, layout, stripe_count),
290 XATTR_LAYOUT_FIELD(file, layout, object_size),
291 XATTR_LAYOUT_FIELD(file, layout, pool),
292 XATTR_LAYOUT_FIELD(file, layout, pool_namespace),
293 { .name = NULL, 0 } /* Required table terminator */
294 };
295 static size_t ceph_file_vxattrs_name_size; /* total size of all names */
296
297 static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode)
298 {
299 if (S_ISDIR(inode->i_mode))
300 return ceph_dir_vxattrs;
301 else if (S_ISREG(inode->i_mode))
302 return ceph_file_vxattrs;
303 return NULL;
304 }
305
306 static size_t ceph_vxattrs_name_size(struct ceph_vxattr *vxattrs)
307 {
308 if (vxattrs == ceph_dir_vxattrs)
309 return ceph_dir_vxattrs_name_size;
310 if (vxattrs == ceph_file_vxattrs)
311 return ceph_file_vxattrs_name_size;
312 BUG_ON(vxattrs);
313 return 0;
314 }
315
316 /*
317 * Compute the aggregate size (including terminating '\0') of all
318 * virtual extended attribute names in the given vxattr table.
319 */
320 static size_t __init vxattrs_name_size(struct ceph_vxattr *vxattrs)
321 {
322 struct ceph_vxattr *vxattr;
323 size_t size = 0;
324
325 for (vxattr = vxattrs; vxattr->name; vxattr++)
326 if (!vxattr->hidden)
327 size += vxattr->name_size;
328
329 return size;
330 }
331
332 /* Routines called at initialization and exit time */
333
334 void __init ceph_xattr_init(void)
335 {
336 ceph_dir_vxattrs_name_size = vxattrs_name_size(ceph_dir_vxattrs);
337 ceph_file_vxattrs_name_size = vxattrs_name_size(ceph_file_vxattrs);
338 }
339
340 void ceph_xattr_exit(void)
341 {
342 ceph_dir_vxattrs_name_size = 0;
343 ceph_file_vxattrs_name_size = 0;
344 }
345
346 static struct ceph_vxattr *ceph_match_vxattr(struct inode *inode,
347 const char *name)
348 {
349 struct ceph_vxattr *vxattr = ceph_inode_vxattrs(inode);
350
351 if (vxattr) {
352 while (vxattr->name) {
353 if (!strcmp(vxattr->name, name))
354 return vxattr;
355 vxattr++;
356 }
357 }
358
359 return NULL;
360 }
361
362 static int __set_xattr(struct ceph_inode_info *ci,
363 const char *name, int name_len,
364 const char *val, int val_len,
365 int flags, int update_xattr,
366 struct ceph_inode_xattr **newxattr)
367 {
368 struct rb_node **p;
369 struct rb_node *parent = NULL;
370 struct ceph_inode_xattr *xattr = NULL;
371 int c;
372 int new = 0;
373
374 p = &ci->i_xattrs.index.rb_node;
375 while (*p) {
376 parent = *p;
377 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
378 c = strncmp(name, xattr->name, min(name_len, xattr->name_len));
379 if (c < 0)
380 p = &(*p)->rb_left;
381 else if (c > 0)
382 p = &(*p)->rb_right;
383 else {
384 if (name_len == xattr->name_len)
385 break;
386 else if (name_len < xattr->name_len)
387 p = &(*p)->rb_left;
388 else
389 p = &(*p)->rb_right;
390 }
391 xattr = NULL;
392 }
393
394 if (update_xattr) {
395 int err = 0;
396
397 if (xattr && (flags & XATTR_CREATE))
398 err = -EEXIST;
399 else if (!xattr && (flags & XATTR_REPLACE))
400 err = -ENODATA;
401 if (err) {
402 kfree(name);
403 kfree(val);
404 kfree(*newxattr);
405 return err;
406 }
407 if (update_xattr < 0) {
408 if (xattr)
409 __remove_xattr(ci, xattr);
410 kfree(name);
411 kfree(*newxattr);
412 return 0;
413 }
414 }
415
416 if (!xattr) {
417 new = 1;
418 xattr = *newxattr;
419 xattr->name = name;
420 xattr->name_len = name_len;
421 xattr->should_free_name = update_xattr;
422
423 ci->i_xattrs.count++;
424 dout("__set_xattr count=%d\n", ci->i_xattrs.count);
425 } else {
426 kfree(*newxattr);
427 *newxattr = NULL;
428 if (xattr->should_free_val)
429 kfree((void *)xattr->val);
430
431 if (update_xattr) {
432 kfree((void *)name);
433 name = xattr->name;
434 }
435 ci->i_xattrs.names_size -= xattr->name_len;
436 ci->i_xattrs.vals_size -= xattr->val_len;
437 }
438 ci->i_xattrs.names_size += name_len;
439 ci->i_xattrs.vals_size += val_len;
440 if (val)
441 xattr->val = val;
442 else
443 xattr->val = "";
444
445 xattr->val_len = val_len;
446 xattr->dirty = update_xattr;
447 xattr->should_free_val = (val && update_xattr);
448
449 if (new) {
450 rb_link_node(&xattr->node, parent, p);
451 rb_insert_color(&xattr->node, &ci->i_xattrs.index);
452 dout("__set_xattr_val p=%p\n", p);
453 }
454
455 dout("__set_xattr_val added %llx.%llx xattr %p %s=%.*s\n",
456 ceph_vinop(&ci->vfs_inode), xattr, name, val_len, val);
457
458 return 0;
459 }
460
461 static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci,
462 const char *name)
463 {
464 struct rb_node **p;
465 struct rb_node *parent = NULL;
466 struct ceph_inode_xattr *xattr = NULL;
467 int name_len = strlen(name);
468 int c;
469
470 p = &ci->i_xattrs.index.rb_node;
471 while (*p) {
472 parent = *p;
473 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
474 c = strncmp(name, xattr->name, xattr->name_len);
475 if (c == 0 && name_len > xattr->name_len)
476 c = 1;
477 if (c < 0)
478 p = &(*p)->rb_left;
479 else if (c > 0)
480 p = &(*p)->rb_right;
481 else {
482 dout("__get_xattr %s: found %.*s\n", name,
483 xattr->val_len, xattr->val);
484 return xattr;
485 }
486 }
487
488 dout("__get_xattr %s: not found\n", name);
489
490 return NULL;
491 }
492
493 static void __free_xattr(struct ceph_inode_xattr *xattr)
494 {
495 BUG_ON(!xattr);
496
497 if (xattr->should_free_name)
498 kfree((void *)xattr->name);
499 if (xattr->should_free_val)
500 kfree((void *)xattr->val);
501
502 kfree(xattr);
503 }
504
505 static int __remove_xattr(struct ceph_inode_info *ci,
506 struct ceph_inode_xattr *xattr)
507 {
508 if (!xattr)
509 return -ENODATA;
510
511 rb_erase(&xattr->node, &ci->i_xattrs.index);
512
513 if (xattr->should_free_name)
514 kfree((void *)xattr->name);
515 if (xattr->should_free_val)
516 kfree((void *)xattr->val);
517
518 ci->i_xattrs.names_size -= xattr->name_len;
519 ci->i_xattrs.vals_size -= xattr->val_len;
520 ci->i_xattrs.count--;
521 kfree(xattr);
522
523 return 0;
524 }
525
526 static char *__copy_xattr_names(struct ceph_inode_info *ci,
527 char *dest)
528 {
529 struct rb_node *p;
530 struct ceph_inode_xattr *xattr = NULL;
531
532 p = rb_first(&ci->i_xattrs.index);
533 dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count);
534
535 while (p) {
536 xattr = rb_entry(p, struct ceph_inode_xattr, node);
537 memcpy(dest, xattr->name, xattr->name_len);
538 dest[xattr->name_len] = '\0';
539
540 dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name,
541 xattr->name_len, ci->i_xattrs.names_size);
542
543 dest += xattr->name_len + 1;
544 p = rb_next(p);
545 }
546
547 return dest;
548 }
549
550 void __ceph_destroy_xattrs(struct ceph_inode_info *ci)
551 {
552 struct rb_node *p, *tmp;
553 struct ceph_inode_xattr *xattr = NULL;
554
555 p = rb_first(&ci->i_xattrs.index);
556
557 dout("__ceph_destroy_xattrs p=%p\n", p);
558
559 while (p) {
560 xattr = rb_entry(p, struct ceph_inode_xattr, node);
561 tmp = p;
562 p = rb_next(tmp);
563 dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p,
564 xattr->name_len, xattr->name);
565 rb_erase(tmp, &ci->i_xattrs.index);
566
567 __free_xattr(xattr);
568 }
569
570 ci->i_xattrs.names_size = 0;
571 ci->i_xattrs.vals_size = 0;
572 ci->i_xattrs.index_version = 0;
573 ci->i_xattrs.count = 0;
574 ci->i_xattrs.index = RB_ROOT;
575 }
576
577 static int __build_xattrs(struct inode *inode)
578 __releases(ci->i_ceph_lock)
579 __acquires(ci->i_ceph_lock)
580 {
581 u32 namelen;
582 u32 numattr = 0;
583 void *p, *end;
584 u32 len;
585 const char *name, *val;
586 struct ceph_inode_info *ci = ceph_inode(inode);
587 int xattr_version;
588 struct ceph_inode_xattr **xattrs = NULL;
589 int err = 0;
590 int i;
591
592 dout("__build_xattrs() len=%d\n",
593 ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0);
594
595 if (ci->i_xattrs.index_version >= ci->i_xattrs.version)
596 return 0; /* already built */
597
598 __ceph_destroy_xattrs(ci);
599
600 start:
601 /* updated internal xattr rb tree */
602 if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) {
603 p = ci->i_xattrs.blob->vec.iov_base;
604 end = p + ci->i_xattrs.blob->vec.iov_len;
605 ceph_decode_32_safe(&p, end, numattr, bad);
606 xattr_version = ci->i_xattrs.version;
607 spin_unlock(&ci->i_ceph_lock);
608
609 xattrs = kcalloc(numattr, sizeof(struct ceph_inode_xattr *),
610 GFP_NOFS);
611 err = -ENOMEM;
612 if (!xattrs)
613 goto bad_lock;
614
615 for (i = 0; i < numattr; i++) {
616 xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr),
617 GFP_NOFS);
618 if (!xattrs[i])
619 goto bad_lock;
620 }
621
622 spin_lock(&ci->i_ceph_lock);
623 if (ci->i_xattrs.version != xattr_version) {
624 /* lost a race, retry */
625 for (i = 0; i < numattr; i++)
626 kfree(xattrs[i]);
627 kfree(xattrs);
628 xattrs = NULL;
629 goto start;
630 }
631 err = -EIO;
632 while (numattr--) {
633 ceph_decode_32_safe(&p, end, len, bad);
634 namelen = len;
635 name = p;
636 p += len;
637 ceph_decode_32_safe(&p, end, len, bad);
638 val = p;
639 p += len;
640
641 err = __set_xattr(ci, name, namelen, val, len,
642 0, 0, &xattrs[numattr]);
643
644 if (err < 0)
645 goto bad;
646 }
647 kfree(xattrs);
648 }
649 ci->i_xattrs.index_version = ci->i_xattrs.version;
650 ci->i_xattrs.dirty = false;
651
652 return err;
653 bad_lock:
654 spin_lock(&ci->i_ceph_lock);
655 bad:
656 if (xattrs) {
657 for (i = 0; i < numattr; i++)
658 kfree(xattrs[i]);
659 kfree(xattrs);
660 }
661 ci->i_xattrs.names_size = 0;
662 return err;
663 }
664
665 static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size,
666 int val_size)
667 {
668 /*
669 * 4 bytes for the length, and additional 4 bytes per each xattr name,
670 * 4 bytes per each value
671 */
672 int size = 4 + ci->i_xattrs.count*(4 + 4) +
673 ci->i_xattrs.names_size +
674 ci->i_xattrs.vals_size;
675 dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n",
676 ci->i_xattrs.count, ci->i_xattrs.names_size,
677 ci->i_xattrs.vals_size);
678
679 if (name_size)
680 size += 4 + 4 + name_size + val_size;
681
682 return size;
683 }
684
685 /*
686 * If there are dirty xattrs, reencode xattrs into the prealloc_blob
687 * and swap into place.
688 */
689 void __ceph_build_xattrs_blob(struct ceph_inode_info *ci)
690 {
691 struct rb_node *p;
692 struct ceph_inode_xattr *xattr = NULL;
693 void *dest;
694
695 dout("__build_xattrs_blob %p\n", &ci->vfs_inode);
696 if (ci->i_xattrs.dirty) {
697 int need = __get_required_blob_size(ci, 0, 0);
698
699 BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len);
700
701 p = rb_first(&ci->i_xattrs.index);
702 dest = ci->i_xattrs.prealloc_blob->vec.iov_base;
703
704 ceph_encode_32(&dest, ci->i_xattrs.count);
705 while (p) {
706 xattr = rb_entry(p, struct ceph_inode_xattr, node);
707
708 ceph_encode_32(&dest, xattr->name_len);
709 memcpy(dest, xattr->name, xattr->name_len);
710 dest += xattr->name_len;
711 ceph_encode_32(&dest, xattr->val_len);
712 memcpy(dest, xattr->val, xattr->val_len);
713 dest += xattr->val_len;
714
715 p = rb_next(p);
716 }
717
718 /* adjust buffer len; it may be larger than we need */
719 ci->i_xattrs.prealloc_blob->vec.iov_len =
720 dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
721
722 if (ci->i_xattrs.blob)
723 ceph_buffer_put(ci->i_xattrs.blob);
724 ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
725 ci->i_xattrs.prealloc_blob = NULL;
726 ci->i_xattrs.dirty = false;
727 ci->i_xattrs.version++;
728 }
729 }
730
731 static inline int __get_request_mask(struct inode *in) {
732 struct ceph_mds_request *req = current->journal_info;
733 int mask = 0;
734 if (req && req->r_target_inode == in) {
735 if (req->r_op == CEPH_MDS_OP_LOOKUP ||
736 req->r_op == CEPH_MDS_OP_LOOKUPINO ||
737 req->r_op == CEPH_MDS_OP_LOOKUPPARENT ||
738 req->r_op == CEPH_MDS_OP_GETATTR) {
739 mask = le32_to_cpu(req->r_args.getattr.mask);
740 } else if (req->r_op == CEPH_MDS_OP_OPEN ||
741 req->r_op == CEPH_MDS_OP_CREATE) {
742 mask = le32_to_cpu(req->r_args.open.mask);
743 }
744 }
745 return mask;
746 }
747
748 ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
749 size_t size)
750 {
751 struct ceph_inode_info *ci = ceph_inode(inode);
752 struct ceph_inode_xattr *xattr;
753 struct ceph_vxattr *vxattr = NULL;
754 int req_mask;
755 int err;
756
757 /* let's see if a virtual xattr was requested */
758 vxattr = ceph_match_vxattr(inode, name);
759 if (vxattr) {
760 err = ceph_do_getattr(inode, 0, true);
761 if (err)
762 return err;
763 err = -ENODATA;
764 if (!(vxattr->exists_cb && !vxattr->exists_cb(ci)))
765 err = vxattr->getxattr_cb(ci, value, size);
766 return err;
767 }
768
769 req_mask = __get_request_mask(inode);
770
771 spin_lock(&ci->i_ceph_lock);
772 dout("getxattr %p ver=%lld index_ver=%lld\n", inode,
773 ci->i_xattrs.version, ci->i_xattrs.index_version);
774
775 if (ci->i_xattrs.version == 0 ||
776 !((req_mask & CEPH_CAP_XATTR_SHARED) ||
777 __ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1))) {
778 spin_unlock(&ci->i_ceph_lock);
779
780 /* security module gets xattr while filling trace */
781 if (current->journal_info) {
782 pr_warn_ratelimited("sync getxattr %p "
783 "during filling trace\n", inode);
784 return -EBUSY;
785 }
786
787 /* get xattrs from mds (if we don't already have them) */
788 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
789 if (err)
790 return err;
791 spin_lock(&ci->i_ceph_lock);
792 }
793
794 err = __build_xattrs(inode);
795 if (err < 0)
796 goto out;
797
798 err = -ENODATA; /* == ENOATTR */
799 xattr = __get_xattr(ci, name);
800 if (!xattr)
801 goto out;
802
803 err = -ERANGE;
804 if (size && size < xattr->val_len)
805 goto out;
806
807 err = xattr->val_len;
808 if (size == 0)
809 goto out;
810
811 memcpy(value, xattr->val, xattr->val_len);
812
813 if (current->journal_info &&
814 !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN))
815 ci->i_ceph_flags |= CEPH_I_SEC_INITED;
816 out:
817 spin_unlock(&ci->i_ceph_lock);
818 return err;
819 }
820
821 ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
822 {
823 struct inode *inode = d_inode(dentry);
824 struct ceph_inode_info *ci = ceph_inode(inode);
825 struct ceph_vxattr *vxattrs = ceph_inode_vxattrs(inode);
826 u32 vir_namelen = 0;
827 u32 namelen;
828 int err;
829 u32 len;
830 int i;
831
832 spin_lock(&ci->i_ceph_lock);
833 dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
834 ci->i_xattrs.version, ci->i_xattrs.index_version);
835
836 if (ci->i_xattrs.version == 0 ||
837 !__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1)) {
838 spin_unlock(&ci->i_ceph_lock);
839 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
840 if (err)
841 return err;
842 spin_lock(&ci->i_ceph_lock);
843 }
844
845 err = __build_xattrs(inode);
846 if (err < 0)
847 goto out;
848 /*
849 * Start with virtual dir xattr names (if any) (including
850 * terminating '\0' characters for each).
851 */
852 vir_namelen = ceph_vxattrs_name_size(vxattrs);
853
854 /* adding 1 byte per each variable due to the null termination */
855 namelen = ci->i_xattrs.names_size + ci->i_xattrs.count;
856 err = -ERANGE;
857 if (size && vir_namelen + namelen > size)
858 goto out;
859
860 err = namelen + vir_namelen;
861 if (size == 0)
862 goto out;
863
864 names = __copy_xattr_names(ci, names);
865
866 /* virtual xattr names, too */
867 err = namelen;
868 if (vxattrs) {
869 for (i = 0; vxattrs[i].name; i++) {
870 if (!vxattrs[i].hidden &&
871 !(vxattrs[i].exists_cb &&
872 !vxattrs[i].exists_cb(ci))) {
873 len = sprintf(names, "%s", vxattrs[i].name);
874 names += len + 1;
875 err += len + 1;
876 }
877 }
878 }
879
880 out:
881 spin_unlock(&ci->i_ceph_lock);
882 return err;
883 }
884
885 static int ceph_sync_setxattr(struct inode *inode, const char *name,
886 const char *value, size_t size, int flags)
887 {
888 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
889 struct ceph_inode_info *ci = ceph_inode(inode);
890 struct ceph_mds_request *req;
891 struct ceph_mds_client *mdsc = fsc->mdsc;
892 struct ceph_pagelist *pagelist = NULL;
893 int op = CEPH_MDS_OP_SETXATTR;
894 int err;
895
896 if (size > 0) {
897 /* copy value into pagelist */
898 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
899 if (!pagelist)
900 return -ENOMEM;
901
902 ceph_pagelist_init(pagelist);
903 err = ceph_pagelist_append(pagelist, value, size);
904 if (err)
905 goto out;
906 } else if (!value) {
907 if (flags & CEPH_XATTR_REPLACE)
908 op = CEPH_MDS_OP_RMXATTR;
909 else
910 flags |= CEPH_XATTR_REMOVE;
911 }
912
913 dout("setxattr value=%.*s\n", (int)size, value);
914
915 /* do request */
916 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
917 if (IS_ERR(req)) {
918 err = PTR_ERR(req);
919 goto out;
920 }
921
922 req->r_path2 = kstrdup(name, GFP_NOFS);
923 if (!req->r_path2) {
924 ceph_mdsc_put_request(req);
925 err = -ENOMEM;
926 goto out;
927 }
928
929 if (op == CEPH_MDS_OP_SETXATTR) {
930 req->r_args.setxattr.flags = cpu_to_le32(flags);
931 req->r_pagelist = pagelist;
932 pagelist = NULL;
933 }
934
935 req->r_inode = inode;
936 ihold(inode);
937 req->r_num_caps = 1;
938 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
939
940 dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
941 err = ceph_mdsc_do_request(mdsc, NULL, req);
942 ceph_mdsc_put_request(req);
943 dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
944
945 out:
946 if (pagelist)
947 ceph_pagelist_release(pagelist);
948 return err;
949 }
950
951 int __ceph_setxattr(struct inode *inode, const char *name,
952 const void *value, size_t size, int flags)
953 {
954 struct ceph_vxattr *vxattr;
955 struct ceph_inode_info *ci = ceph_inode(inode);
956 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
957 struct ceph_cap_flush *prealloc_cf = NULL;
958 int issued;
959 int err;
960 int dirty = 0;
961 int name_len = strlen(name);
962 int val_len = size;
963 char *newname = NULL;
964 char *newval = NULL;
965 struct ceph_inode_xattr *xattr = NULL;
966 int required_blob_size;
967 bool lock_snap_rwsem = false;
968
969 if (ceph_snap(inode) != CEPH_NOSNAP)
970 return -EROFS;
971
972 vxattr = ceph_match_vxattr(inode, name);
973 if (vxattr && vxattr->readonly)
974 return -EOPNOTSUPP;
975
976 /* pass any unhandled ceph.* xattrs through to the MDS */
977 if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
978 goto do_sync_unlocked;
979
980 /* preallocate memory for xattr name, value, index node */
981 err = -ENOMEM;
982 newname = kmemdup(name, name_len + 1, GFP_NOFS);
983 if (!newname)
984 goto out;
985
986 if (val_len) {
987 newval = kmemdup(value, val_len, GFP_NOFS);
988 if (!newval)
989 goto out;
990 }
991
992 xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS);
993 if (!xattr)
994 goto out;
995
996 prealloc_cf = ceph_alloc_cap_flush();
997 if (!prealloc_cf)
998 goto out;
999
1000 spin_lock(&ci->i_ceph_lock);
1001 retry:
1002 issued = __ceph_caps_issued(ci, NULL);
1003 if (ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))
1004 goto do_sync;
1005
1006 if (!lock_snap_rwsem && !ci->i_head_snapc) {
1007 lock_snap_rwsem = true;
1008 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1009 spin_unlock(&ci->i_ceph_lock);
1010 down_read(&mdsc->snap_rwsem);
1011 spin_lock(&ci->i_ceph_lock);
1012 goto retry;
1013 }
1014 }
1015
1016 dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued));
1017 __build_xattrs(inode);
1018
1019 required_blob_size = __get_required_blob_size(ci, name_len, val_len);
1020
1021 if (!ci->i_xattrs.prealloc_blob ||
1022 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
1023 struct ceph_buffer *blob;
1024
1025 spin_unlock(&ci->i_ceph_lock);
1026 dout(" preaallocating new blob size=%d\n", required_blob_size);
1027 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
1028 if (!blob)
1029 goto do_sync_unlocked;
1030 spin_lock(&ci->i_ceph_lock);
1031 if (ci->i_xattrs.prealloc_blob)
1032 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
1033 ci->i_xattrs.prealloc_blob = blob;
1034 goto retry;
1035 }
1036
1037 err = __set_xattr(ci, newname, name_len, newval, val_len,
1038 flags, value ? 1 : -1, &xattr);
1039
1040 if (!err) {
1041 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL,
1042 &prealloc_cf);
1043 ci->i_xattrs.dirty = true;
1044 inode->i_ctime = current_time(inode);
1045 }
1046
1047 spin_unlock(&ci->i_ceph_lock);
1048 if (lock_snap_rwsem)
1049 up_read(&mdsc->snap_rwsem);
1050 if (dirty)
1051 __mark_inode_dirty(inode, dirty);
1052 ceph_free_cap_flush(prealloc_cf);
1053 return err;
1054
1055 do_sync:
1056 spin_unlock(&ci->i_ceph_lock);
1057 do_sync_unlocked:
1058 if (lock_snap_rwsem)
1059 up_read(&mdsc->snap_rwsem);
1060
1061 /* security module set xattr while filling trace */
1062 if (current->journal_info) {
1063 pr_warn_ratelimited("sync setxattr %p "
1064 "during filling trace\n", inode);
1065 err = -EBUSY;
1066 } else {
1067 err = ceph_sync_setxattr(inode, name, value, size, flags);
1068 }
1069 out:
1070 ceph_free_cap_flush(prealloc_cf);
1071 kfree(newname);
1072 kfree(newval);
1073 kfree(xattr);
1074 return err;
1075 }
1076
1077 static int ceph_get_xattr_handler(const struct xattr_handler *handler,
1078 struct dentry *dentry, struct inode *inode,
1079 const char *name, void *value, size_t size)
1080 {
1081 if (!ceph_is_valid_xattr(name))
1082 return -EOPNOTSUPP;
1083 return __ceph_getxattr(inode, name, value, size);
1084 }
1085
1086 static int ceph_set_xattr_handler(const struct xattr_handler *handler,
1087 struct dentry *unused, struct inode *inode,
1088 const char *name, const void *value,
1089 size_t size, int flags)
1090 {
1091 if (!ceph_is_valid_xattr(name))
1092 return -EOPNOTSUPP;
1093 return __ceph_setxattr(inode, name, value, size, flags);
1094 }
1095
1096 static const struct xattr_handler ceph_other_xattr_handler = {
1097 .prefix = "", /* match any name => handlers called with full name */
1098 .get = ceph_get_xattr_handler,
1099 .set = ceph_set_xattr_handler,
1100 };
1101
1102 #ifdef CONFIG_SECURITY
1103 bool ceph_security_xattr_wanted(struct inode *in)
1104 {
1105 return in->i_security != NULL;
1106 }
1107
1108 bool ceph_security_xattr_deadlock(struct inode *in)
1109 {
1110 struct ceph_inode_info *ci;
1111 bool ret;
1112 if (!in->i_security)
1113 return false;
1114 ci = ceph_inode(in);
1115 spin_lock(&ci->i_ceph_lock);
1116 ret = !(ci->i_ceph_flags & CEPH_I_SEC_INITED) &&
1117 !(ci->i_xattrs.version > 0 &&
1118 __ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0));
1119 spin_unlock(&ci->i_ceph_lock);
1120 return ret;
1121 }
1122 #endif
Linux with added FPC-III support