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c6e917d360f7d0e42d52b4b27eb3eadc46531025
[deliverable/linux.git] / fs / ceph / xattr.c
1 #include <linux/ceph/ceph_debug.h>
2 #include <linux/ceph/pagelist.h>
3
4 #include "super.h"
5 #include "mds_client.h"
6
7 #include <linux/ceph/decode.h>
8
9 #include <linux/xattr.h>
10 #include <linux/posix_acl_xattr.h>
11 #include <linux/slab.h>
12
13 #define XATTR_CEPH_PREFIX "ceph."
14 #define XATTR_CEPH_PREFIX_LEN (sizeof (XATTR_CEPH_PREFIX) - 1)
15
16 static int __remove_xattr(struct ceph_inode_info *ci,
17 struct ceph_inode_xattr *xattr);
18
19 /*
20 * List of handlers for synthetic system.* attributes. Other
21 * attributes are handled directly.
22 */
23 const struct xattr_handler *ceph_xattr_handlers[] = {
24 #ifdef CONFIG_CEPH_FS_POSIX_ACL
25 &posix_acl_access_xattr_handler,
26 &posix_acl_default_xattr_handler,
27 #endif
28 NULL,
29 };
30
31 static bool ceph_is_valid_xattr(const char *name)
32 {
33 return !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) ||
34 !strncmp(name, XATTR_SECURITY_PREFIX,
35 XATTR_SECURITY_PREFIX_LEN) ||
36 !strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) ||
37 !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) ||
38 !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
39 }
40
41 /*
42 * These define virtual xattrs exposing the recursive directory
43 * statistics and layout metadata.
44 */
45 struct ceph_vxattr {
46 char *name;
47 size_t name_size; /* strlen(name) + 1 (for '\0') */
48 size_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val,
49 size_t size);
50 bool readonly, hidden;
51 bool (*exists_cb)(struct ceph_inode_info *ci);
52 };
53
54 /* layouts */
55
56 static bool ceph_vxattrcb_layout_exists(struct ceph_inode_info *ci)
57 {
58 size_t s;
59 char *p = (char *)&ci->i_layout;
60
61 for (s = 0; s < sizeof(ci->i_layout); s++, p++)
62 if (*p)
63 return true;
64 return false;
65 }
66
67 static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
68 size_t size)
69 {
70 int ret;
71 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
72 struct ceph_osd_client *osdc = &fsc->client->osdc;
73 s64 pool = ceph_file_layout_pg_pool(ci->i_layout);
74 const char *pool_name;
75 char buf[128];
76
77 dout("ceph_vxattrcb_layout %p\n", &ci->vfs_inode);
78 down_read(&osdc->map_sem);
79 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
80 if (pool_name) {
81 size_t len = strlen(pool_name);
82 ret = snprintf(buf, sizeof(buf),
83 "stripe_unit=%lld stripe_count=%lld object_size=%lld pool=",
84 (unsigned long long)ceph_file_layout_su(ci->i_layout),
85 (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
86 (unsigned long long)ceph_file_layout_object_size(ci->i_layout));
87 if (!size) {
88 ret += len;
89 } else if (ret + len > size) {
90 ret = -ERANGE;
91 } else {
92 memcpy(val, buf, ret);
93 memcpy(val + ret, pool_name, len);
94 ret += len;
95 }
96 } else {
97 ret = snprintf(buf, sizeof(buf),
98 "stripe_unit=%lld stripe_count=%lld object_size=%lld pool=%lld",
99 (unsigned long long)ceph_file_layout_su(ci->i_layout),
100 (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
101 (unsigned long long)ceph_file_layout_object_size(ci->i_layout),
102 (unsigned long long)pool);
103 if (size) {
104 if (ret <= size)
105 memcpy(val, buf, ret);
106 else
107 ret = -ERANGE;
108 }
109 }
110 up_read(&osdc->map_sem);
111 return ret;
112 }
113
114 static size_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci,
115 char *val, size_t size)
116 {
117 return snprintf(val, size, "%lld",
118 (unsigned long long)ceph_file_layout_su(ci->i_layout));
119 }
120
121 static size_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci,
122 char *val, size_t size)
123 {
124 return snprintf(val, size, "%lld",
125 (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout));
126 }
127
128 static size_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci,
129 char *val, size_t size)
130 {
131 return snprintf(val, size, "%lld",
132 (unsigned long long)ceph_file_layout_object_size(ci->i_layout));
133 }
134
135 static size_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci,
136 char *val, size_t size)
137 {
138 int ret;
139 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
140 struct ceph_osd_client *osdc = &fsc->client->osdc;
141 s64 pool = ceph_file_layout_pg_pool(ci->i_layout);
142 const char *pool_name;
143
144 down_read(&osdc->map_sem);
145 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
146 if (pool_name)
147 ret = snprintf(val, size, "%s", pool_name);
148 else
149 ret = snprintf(val, size, "%lld", (unsigned long long)pool);
150 up_read(&osdc->map_sem);
151 return ret;
152 }
153
154 /* directories */
155
156 static size_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val,
157 size_t size)
158 {
159 return snprintf(val, size, "%lld", ci->i_files + ci->i_subdirs);
160 }
161
162 static size_t ceph_vxattrcb_dir_files(struct ceph_inode_info *ci, char *val,
163 size_t size)
164 {
165 return snprintf(val, size, "%lld", ci->i_files);
166 }
167
168 static size_t ceph_vxattrcb_dir_subdirs(struct ceph_inode_info *ci, char *val,
169 size_t size)
170 {
171 return snprintf(val, size, "%lld", ci->i_subdirs);
172 }
173
174 static size_t ceph_vxattrcb_dir_rentries(struct ceph_inode_info *ci, char *val,
175 size_t size)
176 {
177 return snprintf(val, size, "%lld", ci->i_rfiles + ci->i_rsubdirs);
178 }
179
180 static size_t ceph_vxattrcb_dir_rfiles(struct ceph_inode_info *ci, char *val,
181 size_t size)
182 {
183 return snprintf(val, size, "%lld", ci->i_rfiles);
184 }
185
186 static size_t ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info *ci, char *val,
187 size_t size)
188 {
189 return snprintf(val, size, "%lld", ci->i_rsubdirs);
190 }
191
192 static size_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val,
193 size_t size)
194 {
195 return snprintf(val, size, "%lld", ci->i_rbytes);
196 }
197
198 static size_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val,
199 size_t size)
200 {
201 return snprintf(val, size, "%ld.09%ld", (long)ci->i_rctime.tv_sec,
202 (long)ci->i_rctime.tv_nsec);
203 }
204
205
206 #define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name
207 #define CEPH_XATTR_NAME2(_type, _name, _name2) \
208 XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
209
210 #define XATTR_NAME_CEPH(_type, _name) \
211 { \
212 .name = CEPH_XATTR_NAME(_type, _name), \
213 .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \
214 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
215 .readonly = true, \
216 .hidden = false, \
217 .exists_cb = NULL, \
218 }
219 #define XATTR_LAYOUT_FIELD(_type, _name, _field) \
220 { \
221 .name = CEPH_XATTR_NAME2(_type, _name, _field), \
222 .name_size = sizeof (CEPH_XATTR_NAME2(_type, _name, _field)), \
223 .getxattr_cb = ceph_vxattrcb_ ## _name ## _ ## _field, \
224 .readonly = false, \
225 .hidden = true, \
226 .exists_cb = ceph_vxattrcb_layout_exists, \
227 }
228
229 static struct ceph_vxattr ceph_dir_vxattrs[] = {
230 {
231 .name = "ceph.dir.layout",
232 .name_size = sizeof("ceph.dir.layout"),
233 .getxattr_cb = ceph_vxattrcb_layout,
234 .readonly = false,
235 .hidden = true,
236 .exists_cb = ceph_vxattrcb_layout_exists,
237 },
238 XATTR_LAYOUT_FIELD(dir, layout, stripe_unit),
239 XATTR_LAYOUT_FIELD(dir, layout, stripe_count),
240 XATTR_LAYOUT_FIELD(dir, layout, object_size),
241 XATTR_LAYOUT_FIELD(dir, layout, pool),
242 XATTR_NAME_CEPH(dir, entries),
243 XATTR_NAME_CEPH(dir, files),
244 XATTR_NAME_CEPH(dir, subdirs),
245 XATTR_NAME_CEPH(dir, rentries),
246 XATTR_NAME_CEPH(dir, rfiles),
247 XATTR_NAME_CEPH(dir, rsubdirs),
248 XATTR_NAME_CEPH(dir, rbytes),
249 XATTR_NAME_CEPH(dir, rctime),
250 { .name = NULL, 0 } /* Required table terminator */
251 };
252 static size_t ceph_dir_vxattrs_name_size; /* total size of all names */
253
254 /* files */
255
256 static struct ceph_vxattr ceph_file_vxattrs[] = {
257 {
258 .name = "ceph.file.layout",
259 .name_size = sizeof("ceph.file.layout"),
260 .getxattr_cb = ceph_vxattrcb_layout,
261 .readonly = false,
262 .hidden = true,
263 .exists_cb = ceph_vxattrcb_layout_exists,
264 },
265 XATTR_LAYOUT_FIELD(file, layout, stripe_unit),
266 XATTR_LAYOUT_FIELD(file, layout, stripe_count),
267 XATTR_LAYOUT_FIELD(file, layout, object_size),
268 XATTR_LAYOUT_FIELD(file, layout, pool),
269 { .name = NULL, 0 } /* Required table terminator */
270 };
271 static size_t ceph_file_vxattrs_name_size; /* total size of all names */
272
273 static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode)
274 {
275 if (S_ISDIR(inode->i_mode))
276 return ceph_dir_vxattrs;
277 else if (S_ISREG(inode->i_mode))
278 return ceph_file_vxattrs;
279 return NULL;
280 }
281
282 static size_t ceph_vxattrs_name_size(struct ceph_vxattr *vxattrs)
283 {
284 if (vxattrs == ceph_dir_vxattrs)
285 return ceph_dir_vxattrs_name_size;
286 if (vxattrs == ceph_file_vxattrs)
287 return ceph_file_vxattrs_name_size;
288 BUG_ON(vxattrs);
289 return 0;
290 }
291
292 /*
293 * Compute the aggregate size (including terminating '\0') of all
294 * virtual extended attribute names in the given vxattr table.
295 */
296 static size_t __init vxattrs_name_size(struct ceph_vxattr *vxattrs)
297 {
298 struct ceph_vxattr *vxattr;
299 size_t size = 0;
300
301 for (vxattr = vxattrs; vxattr->name; vxattr++)
302 if (!vxattr->hidden)
303 size += vxattr->name_size;
304
305 return size;
306 }
307
308 /* Routines called at initialization and exit time */
309
310 void __init ceph_xattr_init(void)
311 {
312 ceph_dir_vxattrs_name_size = vxattrs_name_size(ceph_dir_vxattrs);
313 ceph_file_vxattrs_name_size = vxattrs_name_size(ceph_file_vxattrs);
314 }
315
316 void ceph_xattr_exit(void)
317 {
318 ceph_dir_vxattrs_name_size = 0;
319 ceph_file_vxattrs_name_size = 0;
320 }
321
322 static struct ceph_vxattr *ceph_match_vxattr(struct inode *inode,
323 const char *name)
324 {
325 struct ceph_vxattr *vxattr = ceph_inode_vxattrs(inode);
326
327 if (vxattr) {
328 while (vxattr->name) {
329 if (!strcmp(vxattr->name, name))
330 return vxattr;
331 vxattr++;
332 }
333 }
334
335 return NULL;
336 }
337
338 static int __set_xattr(struct ceph_inode_info *ci,
339 const char *name, int name_len,
340 const char *val, int val_len,
341 int flags, int update_xattr,
342 struct ceph_inode_xattr **newxattr)
343 {
344 struct rb_node **p;
345 struct rb_node *parent = NULL;
346 struct ceph_inode_xattr *xattr = NULL;
347 int c;
348 int new = 0;
349
350 p = &ci->i_xattrs.index.rb_node;
351 while (*p) {
352 parent = *p;
353 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
354 c = strncmp(name, xattr->name, min(name_len, xattr->name_len));
355 if (c < 0)
356 p = &(*p)->rb_left;
357 else if (c > 0)
358 p = &(*p)->rb_right;
359 else {
360 if (name_len == xattr->name_len)
361 break;
362 else if (name_len < xattr->name_len)
363 p = &(*p)->rb_left;
364 else
365 p = &(*p)->rb_right;
366 }
367 xattr = NULL;
368 }
369
370 if (update_xattr) {
371 int err = 0;
372 if (xattr && (flags & XATTR_CREATE))
373 err = -EEXIST;
374 else if (!xattr && (flags & XATTR_REPLACE))
375 err = -ENODATA;
376 if (err) {
377 kfree(name);
378 kfree(val);
379 return err;
380 }
381 if (update_xattr < 0) {
382 if (xattr)
383 __remove_xattr(ci, xattr);
384 kfree(name);
385 return 0;
386 }
387 }
388
389 if (!xattr) {
390 new = 1;
391 xattr = *newxattr;
392 xattr->name = name;
393 xattr->name_len = name_len;
394 xattr->should_free_name = update_xattr;
395
396 ci->i_xattrs.count++;
397 dout("__set_xattr count=%d\n", ci->i_xattrs.count);
398 } else {
399 kfree(*newxattr);
400 *newxattr = NULL;
401 if (xattr->should_free_val)
402 kfree((void *)xattr->val);
403
404 if (update_xattr) {
405 kfree((void *)name);
406 name = xattr->name;
407 }
408 ci->i_xattrs.names_size -= xattr->name_len;
409 ci->i_xattrs.vals_size -= xattr->val_len;
410 }
411 ci->i_xattrs.names_size += name_len;
412 ci->i_xattrs.vals_size += val_len;
413 if (val)
414 xattr->val = val;
415 else
416 xattr->val = "";
417
418 xattr->val_len = val_len;
419 xattr->dirty = update_xattr;
420 xattr->should_free_val = (val && update_xattr);
421
422 if (new) {
423 rb_link_node(&xattr->node, parent, p);
424 rb_insert_color(&xattr->node, &ci->i_xattrs.index);
425 dout("__set_xattr_val p=%p\n", p);
426 }
427
428 dout("__set_xattr_val added %llx.%llx xattr %p %s=%.*s\n",
429 ceph_vinop(&ci->vfs_inode), xattr, name, val_len, val);
430
431 return 0;
432 }
433
434 static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci,
435 const char *name)
436 {
437 struct rb_node **p;
438 struct rb_node *parent = NULL;
439 struct ceph_inode_xattr *xattr = NULL;
440 int name_len = strlen(name);
441 int c;
442
443 p = &ci->i_xattrs.index.rb_node;
444 while (*p) {
445 parent = *p;
446 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
447 c = strncmp(name, xattr->name, xattr->name_len);
448 if (c == 0 && name_len > xattr->name_len)
449 c = 1;
450 if (c < 0)
451 p = &(*p)->rb_left;
452 else if (c > 0)
453 p = &(*p)->rb_right;
454 else {
455 dout("__get_xattr %s: found %.*s\n", name,
456 xattr->val_len, xattr->val);
457 return xattr;
458 }
459 }
460
461 dout("__get_xattr %s: not found\n", name);
462
463 return NULL;
464 }
465
466 static void __free_xattr(struct ceph_inode_xattr *xattr)
467 {
468 BUG_ON(!xattr);
469
470 if (xattr->should_free_name)
471 kfree((void *)xattr->name);
472 if (xattr->should_free_val)
473 kfree((void *)xattr->val);
474
475 kfree(xattr);
476 }
477
478 static int __remove_xattr(struct ceph_inode_info *ci,
479 struct ceph_inode_xattr *xattr)
480 {
481 if (!xattr)
482 return -ENODATA;
483
484 rb_erase(&xattr->node, &ci->i_xattrs.index);
485
486 if (xattr->should_free_name)
487 kfree((void *)xattr->name);
488 if (xattr->should_free_val)
489 kfree((void *)xattr->val);
490
491 ci->i_xattrs.names_size -= xattr->name_len;
492 ci->i_xattrs.vals_size -= xattr->val_len;
493 ci->i_xattrs.count--;
494 kfree(xattr);
495
496 return 0;
497 }
498
499 static int __remove_xattr_by_name(struct ceph_inode_info *ci,
500 const char *name)
501 {
502 struct rb_node **p;
503 struct ceph_inode_xattr *xattr;
504 int err;
505
506 p = &ci->i_xattrs.index.rb_node;
507 xattr = __get_xattr(ci, name);
508 err = __remove_xattr(ci, xattr);
509 return err;
510 }
511
512 static char *__copy_xattr_names(struct ceph_inode_info *ci,
513 char *dest)
514 {
515 struct rb_node *p;
516 struct ceph_inode_xattr *xattr = NULL;
517
518 p = rb_first(&ci->i_xattrs.index);
519 dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count);
520
521 while (p) {
522 xattr = rb_entry(p, struct ceph_inode_xattr, node);
523 memcpy(dest, xattr->name, xattr->name_len);
524 dest[xattr->name_len] = '\0';
525
526 dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name,
527 xattr->name_len, ci->i_xattrs.names_size);
528
529 dest += xattr->name_len + 1;
530 p = rb_next(p);
531 }
532
533 return dest;
534 }
535
536 void __ceph_destroy_xattrs(struct ceph_inode_info *ci)
537 {
538 struct rb_node *p, *tmp;
539 struct ceph_inode_xattr *xattr = NULL;
540
541 p = rb_first(&ci->i_xattrs.index);
542
543 dout("__ceph_destroy_xattrs p=%p\n", p);
544
545 while (p) {
546 xattr = rb_entry(p, struct ceph_inode_xattr, node);
547 tmp = p;
548 p = rb_next(tmp);
549 dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p,
550 xattr->name_len, xattr->name);
551 rb_erase(tmp, &ci->i_xattrs.index);
552
553 __free_xattr(xattr);
554 }
555
556 ci->i_xattrs.names_size = 0;
557 ci->i_xattrs.vals_size = 0;
558 ci->i_xattrs.index_version = 0;
559 ci->i_xattrs.count = 0;
560 ci->i_xattrs.index = RB_ROOT;
561 }
562
563 static int __build_xattrs(struct inode *inode)
564 __releases(ci->i_ceph_lock)
565 __acquires(ci->i_ceph_lock)
566 {
567 u32 namelen;
568 u32 numattr = 0;
569 void *p, *end;
570 u32 len;
571 const char *name, *val;
572 struct ceph_inode_info *ci = ceph_inode(inode);
573 int xattr_version;
574 struct ceph_inode_xattr **xattrs = NULL;
575 int err = 0;
576 int i;
577
578 dout("__build_xattrs() len=%d\n",
579 ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0);
580
581 if (ci->i_xattrs.index_version >= ci->i_xattrs.version)
582 return 0; /* already built */
583
584 __ceph_destroy_xattrs(ci);
585
586 start:
587 /* updated internal xattr rb tree */
588 if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) {
589 p = ci->i_xattrs.blob->vec.iov_base;
590 end = p + ci->i_xattrs.blob->vec.iov_len;
591 ceph_decode_32_safe(&p, end, numattr, bad);
592 xattr_version = ci->i_xattrs.version;
593 spin_unlock(&ci->i_ceph_lock);
594
595 xattrs = kcalloc(numattr, sizeof(struct ceph_inode_xattr *),
596 GFP_NOFS);
597 err = -ENOMEM;
598 if (!xattrs)
599 goto bad_lock;
600
601 for (i = 0; i < numattr; i++) {
602 xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr),
603 GFP_NOFS);
604 if (!xattrs[i])
605 goto bad_lock;
606 }
607
608 spin_lock(&ci->i_ceph_lock);
609 if (ci->i_xattrs.version != xattr_version) {
610 /* lost a race, retry */
611 for (i = 0; i < numattr; i++)
612 kfree(xattrs[i]);
613 kfree(xattrs);
614 xattrs = NULL;
615 goto start;
616 }
617 err = -EIO;
618 while (numattr--) {
619 ceph_decode_32_safe(&p, end, len, bad);
620 namelen = len;
621 name = p;
622 p += len;
623 ceph_decode_32_safe(&p, end, len, bad);
624 val = p;
625 p += len;
626
627 err = __set_xattr(ci, name, namelen, val, len,
628 0, 0, &xattrs[numattr]);
629
630 if (err < 0)
631 goto bad;
632 }
633 kfree(xattrs);
634 }
635 ci->i_xattrs.index_version = ci->i_xattrs.version;
636 ci->i_xattrs.dirty = false;
637
638 return err;
639 bad_lock:
640 spin_lock(&ci->i_ceph_lock);
641 bad:
642 if (xattrs) {
643 for (i = 0; i < numattr; i++)
644 kfree(xattrs[i]);
645 kfree(xattrs);
646 }
647 ci->i_xattrs.names_size = 0;
648 return err;
649 }
650
651 static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size,
652 int val_size)
653 {
654 /*
655 * 4 bytes for the length, and additional 4 bytes per each xattr name,
656 * 4 bytes per each value
657 */
658 int size = 4 + ci->i_xattrs.count*(4 + 4) +
659 ci->i_xattrs.names_size +
660 ci->i_xattrs.vals_size;
661 dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n",
662 ci->i_xattrs.count, ci->i_xattrs.names_size,
663 ci->i_xattrs.vals_size);
664
665 if (name_size)
666 size += 4 + 4 + name_size + val_size;
667
668 return size;
669 }
670
671 /*
672 * If there are dirty xattrs, reencode xattrs into the prealloc_blob
673 * and swap into place.
674 */
675 void __ceph_build_xattrs_blob(struct ceph_inode_info *ci)
676 {
677 struct rb_node *p;
678 struct ceph_inode_xattr *xattr = NULL;
679 void *dest;
680
681 dout("__build_xattrs_blob %p\n", &ci->vfs_inode);
682 if (ci->i_xattrs.dirty) {
683 int need = __get_required_blob_size(ci, 0, 0);
684
685 BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len);
686
687 p = rb_first(&ci->i_xattrs.index);
688 dest = ci->i_xattrs.prealloc_blob->vec.iov_base;
689
690 ceph_encode_32(&dest, ci->i_xattrs.count);
691 while (p) {
692 xattr = rb_entry(p, struct ceph_inode_xattr, node);
693
694 ceph_encode_32(&dest, xattr->name_len);
695 memcpy(dest, xattr->name, xattr->name_len);
696 dest += xattr->name_len;
697 ceph_encode_32(&dest, xattr->val_len);
698 memcpy(dest, xattr->val, xattr->val_len);
699 dest += xattr->val_len;
700
701 p = rb_next(p);
702 }
703
704 /* adjust buffer len; it may be larger than we need */
705 ci->i_xattrs.prealloc_blob->vec.iov_len =
706 dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
707
708 if (ci->i_xattrs.blob)
709 ceph_buffer_put(ci->i_xattrs.blob);
710 ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
711 ci->i_xattrs.prealloc_blob = NULL;
712 ci->i_xattrs.dirty = false;
713 ci->i_xattrs.version++;
714 }
715 }
716
717 static inline int __get_request_mask(struct inode *in) {
718 struct ceph_mds_request *req = current->journal_info;
719 int mask = 0;
720 if (req && req->r_target_inode == in) {
721 if (req->r_op == CEPH_MDS_OP_LOOKUP ||
722 req->r_op == CEPH_MDS_OP_LOOKUPINO ||
723 req->r_op == CEPH_MDS_OP_LOOKUPPARENT ||
724 req->r_op == CEPH_MDS_OP_GETATTR) {
725 mask = le32_to_cpu(req->r_args.getattr.mask);
726 } else if (req->r_op == CEPH_MDS_OP_OPEN ||
727 req->r_op == CEPH_MDS_OP_CREATE) {
728 mask = le32_to_cpu(req->r_args.open.mask);
729 }
730 }
731 return mask;
732 }
733
734 ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
735 size_t size)
736 {
737 struct ceph_inode_info *ci = ceph_inode(inode);
738 struct ceph_inode_xattr *xattr;
739 struct ceph_vxattr *vxattr = NULL;
740 int req_mask;
741 int err;
742
743 if (!ceph_is_valid_xattr(name))
744 return -ENODATA;
745
746 /* let's see if a virtual xattr was requested */
747 vxattr = ceph_match_vxattr(inode, name);
748 if (vxattr) {
749 err = -ENODATA;
750 if (!(vxattr->exists_cb && !vxattr->exists_cb(ci)))
751 err = vxattr->getxattr_cb(ci, value, size);
752 return err;
753 }
754
755 req_mask = __get_request_mask(inode);
756
757 spin_lock(&ci->i_ceph_lock);
758 dout("getxattr %p ver=%lld index_ver=%lld\n", inode,
759 ci->i_xattrs.version, ci->i_xattrs.index_version);
760
761 if (ci->i_xattrs.version == 0 ||
762 !((req_mask & CEPH_CAP_XATTR_SHARED) ||
763 __ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1))) {
764 spin_unlock(&ci->i_ceph_lock);
765
766 /* security module gets xattr while filling trace */
767 if (current->journal_info != NULL) {
768 pr_warn_ratelimited("sync getxattr %p "
769 "during filling trace\n", inode);
770 return -EBUSY;
771 }
772
773 /* get xattrs from mds (if we don't already have them) */
774 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
775 if (err)
776 return err;
777 spin_lock(&ci->i_ceph_lock);
778 }
779
780 err = __build_xattrs(inode);
781 if (err < 0)
782 goto out;
783
784 err = -ENODATA; /* == ENOATTR */
785 xattr = __get_xattr(ci, name);
786 if (!xattr)
787 goto out;
788
789 err = -ERANGE;
790 if (size && size < xattr->val_len)
791 goto out;
792
793 err = xattr->val_len;
794 if (size == 0)
795 goto out;
796
797 memcpy(value, xattr->val, xattr->val_len);
798
799 if (current->journal_info != NULL &&
800 !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN))
801 ci->i_ceph_flags |= CEPH_I_SEC_INITED;
802 out:
803 spin_unlock(&ci->i_ceph_lock);
804 return err;
805 }
806
807 ssize_t ceph_getxattr(struct dentry *dentry, struct inode *inode,
808 const char *name, void *value, size_t size)
809 {
810 if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
811 return generic_getxattr(dentry, inode, name, value, size);
812
813 return __ceph_getxattr(inode, name, value, size);
814 }
815
816 ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
817 {
818 struct inode *inode = d_inode(dentry);
819 struct ceph_inode_info *ci = ceph_inode(inode);
820 struct ceph_vxattr *vxattrs = ceph_inode_vxattrs(inode);
821 u32 vir_namelen = 0;
822 u32 namelen;
823 int err;
824 u32 len;
825 int i;
826
827 spin_lock(&ci->i_ceph_lock);
828 dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
829 ci->i_xattrs.version, ci->i_xattrs.index_version);
830
831 if (ci->i_xattrs.version == 0 ||
832 !__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1)) {
833 spin_unlock(&ci->i_ceph_lock);
834 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
835 if (err)
836 return err;
837 spin_lock(&ci->i_ceph_lock);
838 }
839
840 err = __build_xattrs(inode);
841 if (err < 0)
842 goto out;
843 /*
844 * Start with virtual dir xattr names (if any) (including
845 * terminating '\0' characters for each).
846 */
847 vir_namelen = ceph_vxattrs_name_size(vxattrs);
848
849 /* adding 1 byte per each variable due to the null termination */
850 namelen = ci->i_xattrs.names_size + ci->i_xattrs.count;
851 err = -ERANGE;
852 if (size && vir_namelen + namelen > size)
853 goto out;
854
855 err = namelen + vir_namelen;
856 if (size == 0)
857 goto out;
858
859 names = __copy_xattr_names(ci, names);
860
861 /* virtual xattr names, too */
862 err = namelen;
863 if (vxattrs) {
864 for (i = 0; vxattrs[i].name; i++) {
865 if (!vxattrs[i].hidden &&
866 !(vxattrs[i].exists_cb &&
867 !vxattrs[i].exists_cb(ci))) {
868 len = sprintf(names, "%s", vxattrs[i].name);
869 names += len + 1;
870 err += len + 1;
871 }
872 }
873 }
874
875 out:
876 spin_unlock(&ci->i_ceph_lock);
877 return err;
878 }
879
880 static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
881 const char *value, size_t size, int flags)
882 {
883 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
884 struct inode *inode = d_inode(dentry);
885 struct ceph_inode_info *ci = ceph_inode(inode);
886 struct ceph_mds_request *req;
887 struct ceph_mds_client *mdsc = fsc->mdsc;
888 struct ceph_pagelist *pagelist = NULL;
889 int err;
890
891 if (size > 0) {
892 /* copy value into pagelist */
893 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
894 if (!pagelist)
895 return -ENOMEM;
896
897 ceph_pagelist_init(pagelist);
898 err = ceph_pagelist_append(pagelist, value, size);
899 if (err)
900 goto out;
901 } else if (!value) {
902 flags |= CEPH_XATTR_REMOVE;
903 }
904
905 dout("setxattr value=%.*s\n", (int)size, value);
906
907 /* do request */
908 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETXATTR,
909 USE_AUTH_MDS);
910 if (IS_ERR(req)) {
911 err = PTR_ERR(req);
912 goto out;
913 }
914
915 req->r_args.setxattr.flags = cpu_to_le32(flags);
916 req->r_path2 = kstrdup(name, GFP_NOFS);
917 if (!req->r_path2) {
918 ceph_mdsc_put_request(req);
919 err = -ENOMEM;
920 goto out;
921 }
922
923 req->r_pagelist = pagelist;
924 pagelist = NULL;
925
926 req->r_inode = inode;
927 ihold(inode);
928 req->r_num_caps = 1;
929 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
930
931 dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
932 err = ceph_mdsc_do_request(mdsc, NULL, req);
933 ceph_mdsc_put_request(req);
934 dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
935
936 out:
937 if (pagelist)
938 ceph_pagelist_release(pagelist);
939 return err;
940 }
941
942 int __ceph_setxattr(struct dentry *dentry, const char *name,
943 const void *value, size_t size, int flags)
944 {
945 struct inode *inode = d_inode(dentry);
946 struct ceph_vxattr *vxattr;
947 struct ceph_inode_info *ci = ceph_inode(inode);
948 struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
949 struct ceph_cap_flush *prealloc_cf = NULL;
950 int issued;
951 int err;
952 int dirty = 0;
953 int name_len = strlen(name);
954 int val_len = size;
955 char *newname = NULL;
956 char *newval = NULL;
957 struct ceph_inode_xattr *xattr = NULL;
958 int required_blob_size;
959 bool lock_snap_rwsem = false;
960
961 if (!ceph_is_valid_xattr(name))
962 return -EOPNOTSUPP;
963
964 vxattr = ceph_match_vxattr(inode, name);
965 if (vxattr && vxattr->readonly)
966 return -EOPNOTSUPP;
967
968 /* pass any unhandled ceph.* xattrs through to the MDS */
969 if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
970 goto do_sync_unlocked;
971
972 /* preallocate memory for xattr name, value, index node */
973 err = -ENOMEM;
974 newname = kmemdup(name, name_len + 1, GFP_NOFS);
975 if (!newname)
976 goto out;
977
978 if (val_len) {
979 newval = kmemdup(value, val_len, GFP_NOFS);
980 if (!newval)
981 goto out;
982 }
983
984 xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS);
985 if (!xattr)
986 goto out;
987
988 prealloc_cf = ceph_alloc_cap_flush();
989 if (!prealloc_cf)
990 goto out;
991
992 spin_lock(&ci->i_ceph_lock);
993 retry:
994 issued = __ceph_caps_issued(ci, NULL);
995 if (ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))
996 goto do_sync;
997
998 if (!lock_snap_rwsem && !ci->i_head_snapc) {
999 lock_snap_rwsem = true;
1000 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1001 spin_unlock(&ci->i_ceph_lock);
1002 down_read(&mdsc->snap_rwsem);
1003 spin_lock(&ci->i_ceph_lock);
1004 goto retry;
1005 }
1006 }
1007
1008 dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued));
1009 __build_xattrs(inode);
1010
1011 required_blob_size = __get_required_blob_size(ci, name_len, val_len);
1012
1013 if (!ci->i_xattrs.prealloc_blob ||
1014 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
1015 struct ceph_buffer *blob;
1016
1017 spin_unlock(&ci->i_ceph_lock);
1018 dout(" preaallocating new blob size=%d\n", required_blob_size);
1019 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
1020 if (!blob)
1021 goto do_sync_unlocked;
1022 spin_lock(&ci->i_ceph_lock);
1023 if (ci->i_xattrs.prealloc_blob)
1024 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
1025 ci->i_xattrs.prealloc_blob = blob;
1026 goto retry;
1027 }
1028
1029 err = __set_xattr(ci, newname, name_len, newval, val_len,
1030 flags, value ? 1 : -1, &xattr);
1031
1032 if (!err) {
1033 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL,
1034 &prealloc_cf);
1035 ci->i_xattrs.dirty = true;
1036 inode->i_ctime = current_fs_time(inode->i_sb);
1037 }
1038
1039 spin_unlock(&ci->i_ceph_lock);
1040 if (lock_snap_rwsem)
1041 up_read(&mdsc->snap_rwsem);
1042 if (dirty)
1043 __mark_inode_dirty(inode, dirty);
1044 ceph_free_cap_flush(prealloc_cf);
1045 return err;
1046
1047 do_sync:
1048 spin_unlock(&ci->i_ceph_lock);
1049 do_sync_unlocked:
1050 if (lock_snap_rwsem)
1051 up_read(&mdsc->snap_rwsem);
1052
1053 /* security module set xattr while filling trace */
1054 if (current->journal_info != NULL) {
1055 pr_warn_ratelimited("sync setxattr %p "
1056 "during filling trace\n", inode);
1057 err = -EBUSY;
1058 } else {
1059 err = ceph_sync_setxattr(dentry, name, value, size, flags);
1060 }
1061 out:
1062 ceph_free_cap_flush(prealloc_cf);
1063 kfree(newname);
1064 kfree(newval);
1065 kfree(xattr);
1066 return err;
1067 }
1068
1069 int ceph_setxattr(struct dentry *dentry, const char *name,
1070 const void *value, size_t size, int flags)
1071 {
1072 if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
1073 return -EROFS;
1074
1075 if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
1076 return generic_setxattr(dentry, name, value, size, flags);
1077
1078 if (size == 0)
1079 value = ""; /* empty EA, do not remove */
1080
1081 return __ceph_setxattr(dentry, name, value, size, flags);
1082 }
1083
1084 static int ceph_send_removexattr(struct dentry *dentry, const char *name)
1085 {
1086 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
1087 struct ceph_mds_client *mdsc = fsc->mdsc;
1088 struct inode *inode = d_inode(dentry);
1089 struct ceph_mds_request *req;
1090 int err;
1091
1092 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RMXATTR,
1093 USE_AUTH_MDS);
1094 if (IS_ERR(req))
1095 return PTR_ERR(req);
1096 req->r_path2 = kstrdup(name, GFP_NOFS);
1097 if (!req->r_path2)
1098 return -ENOMEM;
1099
1100 req->r_inode = inode;
1101 ihold(inode);
1102 req->r_num_caps = 1;
1103 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
1104 err = ceph_mdsc_do_request(mdsc, NULL, req);
1105 ceph_mdsc_put_request(req);
1106 return err;
1107 }
1108
1109 int __ceph_removexattr(struct dentry *dentry, const char *name)
1110 {
1111 struct inode *inode = d_inode(dentry);
1112 struct ceph_vxattr *vxattr;
1113 struct ceph_inode_info *ci = ceph_inode(inode);
1114 struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1115 struct ceph_cap_flush *prealloc_cf = NULL;
1116 int issued;
1117 int err;
1118 int required_blob_size;
1119 int dirty;
1120 bool lock_snap_rwsem = false;
1121
1122 if (!ceph_is_valid_xattr(name))
1123 return -EOPNOTSUPP;
1124
1125 vxattr = ceph_match_vxattr(inode, name);
1126 if (vxattr && vxattr->readonly)
1127 return -EOPNOTSUPP;
1128
1129 /* pass any unhandled ceph.* xattrs through to the MDS */
1130 if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
1131 goto do_sync_unlocked;
1132
1133 prealloc_cf = ceph_alloc_cap_flush();
1134 if (!prealloc_cf)
1135 return -ENOMEM;
1136
1137 err = -ENOMEM;
1138 spin_lock(&ci->i_ceph_lock);
1139 retry:
1140 issued = __ceph_caps_issued(ci, NULL);
1141 if (ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))
1142 goto do_sync;
1143
1144 if (!lock_snap_rwsem && !ci->i_head_snapc) {
1145 lock_snap_rwsem = true;
1146 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1147 spin_unlock(&ci->i_ceph_lock);
1148 down_read(&mdsc->snap_rwsem);
1149 spin_lock(&ci->i_ceph_lock);
1150 goto retry;
1151 }
1152 }
1153
1154 dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued));
1155
1156 __build_xattrs(inode);
1157
1158 required_blob_size = __get_required_blob_size(ci, 0, 0);
1159
1160 if (!ci->i_xattrs.prealloc_blob ||
1161 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
1162 struct ceph_buffer *blob;
1163
1164 spin_unlock(&ci->i_ceph_lock);
1165 dout(" preaallocating new blob size=%d\n", required_blob_size);
1166 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
1167 if (!blob)
1168 goto do_sync_unlocked;
1169 spin_lock(&ci->i_ceph_lock);
1170 if (ci->i_xattrs.prealloc_blob)
1171 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
1172 ci->i_xattrs.prealloc_blob = blob;
1173 goto retry;
1174 }
1175
1176 err = __remove_xattr_by_name(ceph_inode(inode), name);
1177
1178 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL,
1179 &prealloc_cf);
1180 ci->i_xattrs.dirty = true;
1181 inode->i_ctime = current_fs_time(inode->i_sb);
1182 spin_unlock(&ci->i_ceph_lock);
1183 if (lock_snap_rwsem)
1184 up_read(&mdsc->snap_rwsem);
1185 if (dirty)
1186 __mark_inode_dirty(inode, dirty);
1187 ceph_free_cap_flush(prealloc_cf);
1188 return err;
1189 do_sync:
1190 spin_unlock(&ci->i_ceph_lock);
1191 do_sync_unlocked:
1192 if (lock_snap_rwsem)
1193 up_read(&mdsc->snap_rwsem);
1194 ceph_free_cap_flush(prealloc_cf);
1195 err = ceph_send_removexattr(dentry, name);
1196 return err;
1197 }
1198
1199 int ceph_removexattr(struct dentry *dentry, const char *name)
1200 {
1201 if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
1202 return -EROFS;
1203
1204 if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
1205 return generic_removexattr(dentry, name);
1206
1207 return __ceph_removexattr(dentry, name);
1208 }
1209
1210 #ifdef CONFIG_SECURITY
1211 bool ceph_security_xattr_wanted(struct inode *in)
1212 {
1213 return in->i_security != NULL;
1214 }
1215
1216 bool ceph_security_xattr_deadlock(struct inode *in)
1217 {
1218 struct ceph_inode_info *ci;
1219 bool ret;
1220 if (in->i_security == NULL)
1221 return false;
1222 ci = ceph_inode(in);
1223 spin_lock(&ci->i_ceph_lock);
1224 ret = !(ci->i_ceph_flags & CEPH_I_SEC_INITED) &&
1225 !(ci->i_xattrs.version > 0 &&
1226 __ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0));
1227 spin_unlock(&ci->i_ceph_lock);
1228 return ret;
1229 }
1230 #endif
Linux kernel - Deliverables
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