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libceph: allow STAT osd operations
[deliverable/linux.git] / fs / ceph / xattr.c
CommitLineData
3d14c5d2
YS		 1#include <linux/ceph/ceph_debug.h>
2
355da1eb 3#include "super.h"
3d14c5d2
YS		 4#include "mds_client.h"
5
6#include <linux/ceph/decode.h>
355da1eb
SW		 7
8#include <linux/xattr.h>
5a0e3ad6 9#include <linux/slab.h>
355da1eb 10
22891907
AE		 11#define XATTR_CEPH_PREFIX "ceph."
12#define XATTR_CEPH_PREFIX_LEN (sizeof (XATTR_CEPH_PREFIX) - 1)
13
355da1eb
SW		 14static bool ceph_is_valid_xattr(const char *name)
15{
22891907 16 return !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) ||
1a756278 17 !strncmp(name, XATTR_SECURITY_PREFIX,
355da1eb
SW		 18 XATTR_SECURITY_PREFIX_LEN) ||
19 !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) ||
20 !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
21}
22
23/*
24 * These define virtual xattrs exposing the recursive directory
25 * statistics and layout metadata.
26 */
881a5fa2 27struct ceph_vxattr {
355da1eb 28 char *name;
3ce6cd12 29 size_t name_size; /* strlen(name) + 1 (for '\0') */
355da1eb
SW		 30 size_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val,
31 size_t size);
8860147a 32 bool readonly, hidden;
f36e4472 33 bool (*exists_cb)(struct ceph_inode_info *ci);
355da1eb
SW		 34};
35
32ab0bd7
SW		 36/* layouts */
37
38static bool ceph_vxattrcb_layout_exists(struct ceph_inode_info *ci)
39{
40 size_t s;
41 char *p = (char *)&ci->i_layout;
42
43 for (s = 0; s < sizeof(ci->i_layout); s++, p++)
44 if (*p)
45 return true;
46 return false;
47}
48
49static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
50 size_t size)
51{
52 int ret;
53 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
54 struct ceph_osd_client *osdc = &fsc->client->osdc;
55 s64 pool = ceph_file_layout_pg_pool(ci->i_layout);
56 const char *pool_name;
57
58 dout("ceph_vxattrcb_layout %p\n", &ci->vfs_inode);
59 down_read(&osdc->map_sem);
60 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
61 if (pool_name)
62 ret = snprintf(val, size,
63 "stripe_unit=%lld stripe_count=%lld object_size=%lld pool=%s",
64 (unsigned long long)ceph_file_layout_su(ci->i_layout),
65 (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
66 (unsigned long long)ceph_file_layout_object_size(ci->i_layout),
67 pool_name);
68 else
69 ret = snprintf(val, size,
70 "stripe_unit=%lld stripe_count=%lld object_size=%lld pool=%lld",
71 (unsigned long long)ceph_file_layout_su(ci->i_layout),
72 (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
73 (unsigned long long)ceph_file_layout_object_size(ci->i_layout),
74 (unsigned long long)pool);
75
76 up_read(&osdc->map_sem);
77 return ret;
78}
79
695b7119
SW		 80static size_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci,
81 char *val, size_t size)
82{
83 return snprintf(val, size, "%lld",
84 (unsigned long long)ceph_file_layout_su(ci->i_layout));
85}
86
87static size_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci,
88 char *val, size_t size)
89{
90 return snprintf(val, size, "%lld",
91 (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout));
92}
93
94static size_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci,
95 char *val, size_t size)
96{
97 return snprintf(val, size, "%lld",
98 (unsigned long long)ceph_file_layout_object_size(ci->i_layout));
99}
100
101static size_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci,
102 char *val, size_t size)
103{
104 int ret;
105 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
106 struct ceph_osd_client *osdc = &fsc->client->osdc;
107 s64 pool = ceph_file_layout_pg_pool(ci->i_layout);
108 const char *pool_name;
109
110 down_read(&osdc->map_sem);
111 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
112 if (pool_name)
113 ret = snprintf(val, size, "%s", pool_name);
114 else
115 ret = snprintf(val, size, "%lld", (unsigned long long)pool);
116 up_read(&osdc->map_sem);
117 return ret;
118}
119
355da1eb
SW		 120/* directories */
121
aa4066ed 122static size_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val,
355da1eb
SW		 123 size_t size)
124{
125 return snprintf(val, size, "%lld", ci->i_files + ci->i_subdirs);
126}
127
aa4066ed 128static size_t ceph_vxattrcb_dir_files(struct ceph_inode_info *ci, char *val,
355da1eb
SW		 129 size_t size)
130{
131 return snprintf(val, size, "%lld", ci->i_files);
132}
133
aa4066ed 134static size_t ceph_vxattrcb_dir_subdirs(struct ceph_inode_info *ci, char *val,
355da1eb
SW		 135 size_t size)
136{
137 return snprintf(val, size, "%lld", ci->i_subdirs);
138}
139
aa4066ed 140static size_t ceph_vxattrcb_dir_rentries(struct ceph_inode_info *ci, char *val,
355da1eb
SW		 141 size_t size)
142{
143 return snprintf(val, size, "%lld", ci->i_rfiles + ci->i_rsubdirs);
144}
145
aa4066ed 146static size_t ceph_vxattrcb_dir_rfiles(struct ceph_inode_info *ci, char *val,
355da1eb
SW		 147 size_t size)
148{
149 return snprintf(val, size, "%lld", ci->i_rfiles);
150}
151
aa4066ed 152static size_t ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info *ci, char *val,
355da1eb
SW		 153 size_t size)
154{
155 return snprintf(val, size, "%lld", ci->i_rsubdirs);
156}
157
aa4066ed 158static size_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val,
355da1eb
SW		 159 size_t size)
160{
161 return snprintf(val, size, "%lld", ci->i_rbytes);
162}
163
aa4066ed 164static size_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val,
355da1eb
SW		 165 size_t size)
166{
3489b42a 167 return snprintf(val, size, "%ld.09%ld", (long)ci->i_rctime.tv_sec,
355da1eb
SW		 168 (long)ci->i_rctime.tv_nsec);
169}
170
32ab0bd7 171
eb788084 172#define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name
695b7119
SW		 173#define CEPH_XATTR_NAME2(_type, _name, _name2) \
174 XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
eb788084 175
8860147a
SW		 176#define XATTR_NAME_CEPH(_type, _name) \
177 { \
178 .name = CEPH_XATTR_NAME(_type, _name), \
179 .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \
180 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
181 .readonly = true, \
182 .hidden = false, \
f36e4472 183 .exists_cb = NULL, \
8860147a 184 }
695b7119
SW		 185#define XATTR_LAYOUT_FIELD(_type, _name, _field) \
186 { \
187 .name = CEPH_XATTR_NAME2(_type, _name, _field), \
188 .name_size = sizeof (CEPH_XATTR_NAME2(_type, _name, _field)), \
189 .getxattr_cb = ceph_vxattrcb_ ## _name ## _ ## _field, \
190 .readonly = false, \
191 .hidden = true, \
192 .exists_cb = ceph_vxattrcb_layout_exists, \
193 }
eb788084 194
881a5fa2 195static struct ceph_vxattr ceph_dir_vxattrs[] = {
1f08f2b0
SW		 196 {
197 .name = "ceph.dir.layout",
198 .name_size = sizeof("ceph.dir.layout"),
199 .getxattr_cb = ceph_vxattrcb_layout,
200 .readonly = false,
201 .hidden = false,
202 .exists_cb = ceph_vxattrcb_layout_exists,
203 },
695b7119
SW		 204 XATTR_LAYOUT_FIELD(dir, layout, stripe_unit),
205 XATTR_LAYOUT_FIELD(dir, layout, stripe_count),
206 XATTR_LAYOUT_FIELD(dir, layout, object_size),
207 XATTR_LAYOUT_FIELD(dir, layout, pool),
eb788084
AE		 208 XATTR_NAME_CEPH(dir, entries),
209 XATTR_NAME_CEPH(dir, files),
210 XATTR_NAME_CEPH(dir, subdirs),
211 XATTR_NAME_CEPH(dir, rentries),
212 XATTR_NAME_CEPH(dir, rfiles),
213 XATTR_NAME_CEPH(dir, rsubdirs),
214 XATTR_NAME_CEPH(dir, rbytes),
215 XATTR_NAME_CEPH(dir, rctime),
216 { 0 } /* Required table terminator */
355da1eb 217};
3ce6cd12 218static size_t ceph_dir_vxattrs_name_size; /* total size of all names */
355da1eb
SW		 219
220/* files */
221
881a5fa2 222static struct ceph_vxattr ceph_file_vxattrs[] = {
32ab0bd7
SW		 223 {
224 .name = "ceph.file.layout",
225 .name_size = sizeof("ceph.file.layout"),
226 .getxattr_cb = ceph_vxattrcb_layout,
227 .readonly = false,
228 .hidden = false,
229 .exists_cb = ceph_vxattrcb_layout_exists,
230 },
695b7119
SW		 231 XATTR_LAYOUT_FIELD(file, layout, stripe_unit),
232 XATTR_LAYOUT_FIELD(file, layout, stripe_count),
233 XATTR_LAYOUT_FIELD(file, layout, object_size),
234 XATTR_LAYOUT_FIELD(file, layout, pool),
eb788084 235 { 0 } /* Required table terminator */
355da1eb 236};
3ce6cd12 237static size_t ceph_file_vxattrs_name_size; /* total size of all names */
355da1eb 238
881a5fa2 239static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode)
355da1eb
SW		 240{
241 if (S_ISDIR(inode->i_mode))
242 return ceph_dir_vxattrs;
243 else if (S_ISREG(inode->i_mode))
244 return ceph_file_vxattrs;
245 return NULL;
246}
247
3ce6cd12
AE		 248static size_t ceph_vxattrs_name_size(struct ceph_vxattr *vxattrs)
249{
250 if (vxattrs == ceph_dir_vxattrs)
251 return ceph_dir_vxattrs_name_size;
252 if (vxattrs == ceph_file_vxattrs)
253 return ceph_file_vxattrs_name_size;
254 BUG();
255
256 return 0;
257}
258
259/*
260 * Compute the aggregate size (including terminating '\0') of all
261 * virtual extended attribute names in the given vxattr table.
262 */
263static size_t __init vxattrs_name_size(struct ceph_vxattr *vxattrs)
264{
265 struct ceph_vxattr *vxattr;
266 size_t size = 0;
267
268 for (vxattr = vxattrs; vxattr->name; vxattr++)
8860147a
SW		 269 if (!vxattr->hidden)
270 size += vxattr->name_size;
3ce6cd12
AE		 271
272 return size;
273}
274
275/* Routines called at initialization and exit time */
276
277void __init ceph_xattr_init(void)
278{
279 ceph_dir_vxattrs_name_size = vxattrs_name_size(ceph_dir_vxattrs);
280 ceph_file_vxattrs_name_size = vxattrs_name_size(ceph_file_vxattrs);
281}
282
283void ceph_xattr_exit(void)
284{
285 ceph_dir_vxattrs_name_size = 0;
286 ceph_file_vxattrs_name_size = 0;
287}
288
881a5fa2 289static struct ceph_vxattr *ceph_match_vxattr(struct inode *inode,
355da1eb
SW		 290 const char *name)
291{
881a5fa2 292 struct ceph_vxattr *vxattr = ceph_inode_vxattrs(inode);
06476a69
AE		 293
294 if (vxattr) {
295 while (vxattr->name) {
296 if (!strcmp(vxattr->name, name))
297 return vxattr;
298 vxattr++;
299 }
300 }
301
355da1eb
SW		 302 return NULL;
303}
304
305static int __set_xattr(struct ceph_inode_info *ci,
306 const char *name, int name_len,
307 const char *val, int val_len,
308 int dirty,
309 int should_free_name, int should_free_val,
310 struct ceph_inode_xattr **newxattr)
311{
312 struct rb_node **p;
313 struct rb_node *parent = NULL;
314 struct ceph_inode_xattr *xattr = NULL;
315 int c;
316 int new = 0;
317
318 p = &ci->i_xattrs.index.rb_node;
319 while (*p) {
320 parent = *p;
321 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
322 c = strncmp(name, xattr->name, min(name_len, xattr->name_len));
323 if (c < 0)
324 p = &(*p)->rb_left;
325 else if (c > 0)
326 p = &(*p)->rb_right;
327 else {
328 if (name_len == xattr->name_len)
329 break;
330 else if (name_len < xattr->name_len)
331 p = &(*p)->rb_left;
332 else
333 p = &(*p)->rb_right;
334 }
335 xattr = NULL;
336 }
337
338 if (!xattr) {
339 new = 1;
340 xattr = *newxattr;
341 xattr->name = name;
342 xattr->name_len = name_len;
343 xattr->should_free_name = should_free_name;
344
345 ci->i_xattrs.count++;
346 dout("__set_xattr count=%d\n", ci->i_xattrs.count);
347 } else {
348 kfree(*newxattr);
349 *newxattr = NULL;
350 if (xattr->should_free_val)
351 kfree((void *)xattr->val);
352
353 if (should_free_name) {
354 kfree((void *)name);
355 name = xattr->name;
356 }
357 ci->i_xattrs.names_size -= xattr->name_len;
358 ci->i_xattrs.vals_size -= xattr->val_len;
359 }
355da1eb
SW		 360 ci->i_xattrs.names_size += name_len;
361 ci->i_xattrs.vals_size += val_len;
362 if (val)
363 xattr->val = val;
364 else
365 xattr->val = "";
366
367 xattr->val_len = val_len;
368 xattr->dirty = dirty;
369 xattr->should_free_val = (val && should_free_val);
370
371 if (new) {
372 rb_link_node(&xattr->node, parent, p);
373 rb_insert_color(&xattr->node, &ci->i_xattrs.index);
374 dout("__set_xattr_val p=%p\n", p);
375 }
376
377 dout("__set_xattr_val added %llx.%llx xattr %p %s=%.*s\n",
378 ceph_vinop(&ci->vfs_inode), xattr, name, val_len, val);
379
380 return 0;
381}
382
383static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci,
384 const char *name)
385{
386 struct rb_node **p;
387 struct rb_node *parent = NULL;
388 struct ceph_inode_xattr *xattr = NULL;
17db143f 389 int name_len = strlen(name);
355da1eb
SW		 390 int c;
391
392 p = &ci->i_xattrs.index.rb_node;
393 while (*p) {
394 parent = *p;
395 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
396 c = strncmp(name, xattr->name, xattr->name_len);
17db143f
SW		 397 if (c == 0 && name_len > xattr->name_len)
398 c = 1;
355da1eb
SW		 399 if (c < 0)
400 p = &(*p)->rb_left;
401 else if (c > 0)
402 p = &(*p)->rb_right;
403 else {
404 dout("__get_xattr %s: found %.*s\n", name,
405 xattr->val_len, xattr->val);
406 return xattr;
407 }
408 }
409
410 dout("__get_xattr %s: not found\n", name);
411
412 return NULL;
413}
414
415static void __free_xattr(struct ceph_inode_xattr *xattr)
416{
417 BUG_ON(!xattr);
418
419 if (xattr->should_free_name)
420 kfree((void *)xattr->name);
421 if (xattr->should_free_val)
422 kfree((void *)xattr->val);
423
424 kfree(xattr);
425}
426
427static int __remove_xattr(struct ceph_inode_info *ci,
428 struct ceph_inode_xattr *xattr)
429{
430 if (!xattr)
431 return -EOPNOTSUPP;
432
433 rb_erase(&xattr->node, &ci->i_xattrs.index);
434
435 if (xattr->should_free_name)
436 kfree((void *)xattr->name);
437 if (xattr->should_free_val)
438 kfree((void *)xattr->val);
439
440 ci->i_xattrs.names_size -= xattr->name_len;
441 ci->i_xattrs.vals_size -= xattr->val_len;
442 ci->i_xattrs.count--;
443 kfree(xattr);
444
445 return 0;
446}
447
448static int __remove_xattr_by_name(struct ceph_inode_info *ci,
449 const char *name)
450{
451 struct rb_node **p;
452 struct ceph_inode_xattr *xattr;
453 int err;
454
455 p = &ci->i_xattrs.index.rb_node;
456 xattr = __get_xattr(ci, name);
457 err = __remove_xattr(ci, xattr);
458 return err;
459}
460
461static char *__copy_xattr_names(struct ceph_inode_info *ci,
462 char *dest)
463{
464 struct rb_node *p;
465 struct ceph_inode_xattr *xattr = NULL;
466
467 p = rb_first(&ci->i_xattrs.index);
468 dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count);
469
470 while (p) {
471 xattr = rb_entry(p, struct ceph_inode_xattr, node);
472 memcpy(dest, xattr->name, xattr->name_len);
473 dest[xattr->name_len] = '\0';
474
475 dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name,
476 xattr->name_len, ci->i_xattrs.names_size);
477
478 dest += xattr->name_len + 1;
479 p = rb_next(p);
480 }
481
482 return dest;
483}
484
485void __ceph_destroy_xattrs(struct ceph_inode_info *ci)
486{
487 struct rb_node *p, *tmp;
488 struct ceph_inode_xattr *xattr = NULL;
489
490 p = rb_first(&ci->i_xattrs.index);
491
492 dout("__ceph_destroy_xattrs p=%p\n", p);
493
494 while (p) {
495 xattr = rb_entry(p, struct ceph_inode_xattr, node);
496 tmp = p;
497 p = rb_next(tmp);
498 dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p,
499 xattr->name_len, xattr->name);
500 rb_erase(tmp, &ci->i_xattrs.index);
501
502 __free_xattr(xattr);
503 }
504
505 ci->i_xattrs.names_size = 0;
506 ci->i_xattrs.vals_size = 0;
507 ci->i_xattrs.index_version = 0;
508 ci->i_xattrs.count = 0;
509 ci->i_xattrs.index = RB_ROOT;
510}
511
512static int __build_xattrs(struct inode *inode)
be655596
SW		 513 __releases(ci->i_ceph_lock)
514 __acquires(ci->i_ceph_lock)
355da1eb
SW		 515{
516 u32 namelen;
517 u32 numattr = 0;
518 void *p, *end;
519 u32 len;
520 const char *name, *val;
521 struct ceph_inode_info *ci = ceph_inode(inode);
522 int xattr_version;
523 struct ceph_inode_xattr **xattrs = NULL;
63ff78b2 524 int err = 0;
355da1eb
SW		 525 int i;
526
527 dout("__build_xattrs() len=%d\n",
528 ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0);
529
530 if (ci->i_xattrs.index_version >= ci->i_xattrs.version)
531 return 0; /* already built */
532
533 __ceph_destroy_xattrs(ci);
534
535start:
536 /* updated internal xattr rb tree */
537 if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) {
538 p = ci->i_xattrs.blob->vec.iov_base;
539 end = p + ci->i_xattrs.blob->vec.iov_len;
540 ceph_decode_32_safe(&p, end, numattr, bad);
541 xattr_version = ci->i_xattrs.version;
be655596 542 spin_unlock(&ci->i_ceph_lock);
355da1eb
SW		 543
544 xattrs = kcalloc(numattr, sizeof(struct ceph_xattr *),
545 GFP_NOFS);
546 err = -ENOMEM;
547 if (!xattrs)
548 goto bad_lock;
549 memset(xattrs, 0, numattr*sizeof(struct ceph_xattr *));
550 for (i = 0; i < numattr; i++) {
551 xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr),
552 GFP_NOFS);
553 if (!xattrs[i])
554 goto bad_lock;
555 }
556
be655596 557 spin_lock(&ci->i_ceph_lock);
355da1eb
SW		 558 if (ci->i_xattrs.version != xattr_version) {
559 /* lost a race, retry */
560 for (i = 0; i < numattr; i++)
561 kfree(xattrs[i]);
562 kfree(xattrs);
21ec6ffa 563 xattrs = NULL;
355da1eb
SW		 564 goto start;
565 }
566 err = -EIO;
567 while (numattr--) {
568 ceph_decode_32_safe(&p, end, len, bad);
569 namelen = len;
570 name = p;
571 p += len;
572 ceph_decode_32_safe(&p, end, len, bad);
573 val = p;
574 p += len;
575
576 err = __set_xattr(ci, name, namelen, val, len,
577 0, 0, 0, &xattrs[numattr]);
578
579 if (err < 0)
580 goto bad;
581 }
582 kfree(xattrs);
583 }
584 ci->i_xattrs.index_version = ci->i_xattrs.version;
585 ci->i_xattrs.dirty = false;
586
587 return err;
588bad_lock:
be655596 589 spin_lock(&ci->i_ceph_lock);
355da1eb
SW		 590bad:
591 if (xattrs) {
592 for (i = 0; i < numattr; i++)
593 kfree(xattrs[i]);
594 kfree(xattrs);
595 }
596 ci->i_xattrs.names_size = 0;
597 return err;
598}
599
600static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size,
601 int val_size)
602{
603 /*
604 * 4 bytes for the length, and additional 4 bytes per each xattr name,
605 * 4 bytes per each value
606 */
607 int size = 4 + ci->i_xattrs.count*(4 + 4) +
608 ci->i_xattrs.names_size +
609 ci->i_xattrs.vals_size;
610 dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n",
611 ci->i_xattrs.count, ci->i_xattrs.names_size,
612 ci->i_xattrs.vals_size);
613
614 if (name_size)
615 size += 4 + 4 + name_size + val_size;
616
617 return size;
618}
619
620/*
621 * If there are dirty xattrs, reencode xattrs into the prealloc_blob
622 * and swap into place.
623 */
624void __ceph_build_xattrs_blob(struct ceph_inode_info *ci)
625{
626 struct rb_node *p;
627 struct ceph_inode_xattr *xattr = NULL;
628 void *dest;
629
630 dout("__build_xattrs_blob %p\n", &ci->vfs_inode);
631 if (ci->i_xattrs.dirty) {
632 int need = __get_required_blob_size(ci, 0, 0);
633
634 BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len);
635
636 p = rb_first(&ci->i_xattrs.index);
637 dest = ci->i_xattrs.prealloc_blob->vec.iov_base;
638
639 ceph_encode_32(&dest, ci->i_xattrs.count);
640 while (p) {
641 xattr = rb_entry(p, struct ceph_inode_xattr, node);
642
643 ceph_encode_32(&dest, xattr->name_len);
644 memcpy(dest, xattr->name, xattr->name_len);
645 dest += xattr->name_len;
646 ceph_encode_32(&dest, xattr->val_len);
647 memcpy(dest, xattr->val, xattr->val_len);
648 dest += xattr->val_len;
649
650 p = rb_next(p);
651 }
652
653 /* adjust buffer len; it may be larger than we need */
654 ci->i_xattrs.prealloc_blob->vec.iov_len =
655 dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
656
b6c1d5b8
SW		 657 if (ci->i_xattrs.blob)
658 ceph_buffer_put(ci->i_xattrs.blob);
355da1eb
SW		 659 ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
660 ci->i_xattrs.prealloc_blob = NULL;
661 ci->i_xattrs.dirty = false;
4a625be4 662 ci->i_xattrs.version++;
355da1eb
SW		 663 }
664}
665
666ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
667 size_t size)
668{
669 struct inode *inode = dentry->d_inode;
670 struct ceph_inode_info *ci = ceph_inode(inode);
355da1eb
SW		 671 int err;
672 struct ceph_inode_xattr *xattr;
881a5fa2 673 struct ceph_vxattr *vxattr = NULL;
355da1eb
SW		 674
675 if (!ceph_is_valid_xattr(name))
676 return -ENODATA;
677
be655596 678 spin_lock(&ci->i_ceph_lock);
355da1eb
SW		 679 dout("getxattr %p ver=%lld index_ver=%lld\n", inode,
680 ci->i_xattrs.version, ci->i_xattrs.index_version);
681
0bee82fb
SW		 682 /* let's see if a virtual xattr was requested */
683 vxattr = ceph_match_vxattr(inode, name);
684 if (vxattr && !(vxattr->exists_cb && !vxattr->exists_cb(ci))) {
685 err = vxattr->getxattr_cb(ci, value, size);
686 goto out;
687 }
688
355da1eb
SW		 689 if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
690 (ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
691 goto get_xattr;
692 } else {
be655596 693 spin_unlock(&ci->i_ceph_lock);
355da1eb
SW		 694 /* get xattrs from mds (if we don't already have them) */
695 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
696 if (err)
697 return err;
698 }
699
be655596 700 spin_lock(&ci->i_ceph_lock);
355da1eb 701
355da1eb
SW		 702 err = __build_xattrs(inode);
703 if (err < 0)
704 goto out;
705
706get_xattr:
707 err = -ENODATA; /* == ENOATTR */
708 xattr = __get_xattr(ci, name);
0bee82fb 709 if (!xattr)
355da1eb 710 goto out;
355da1eb
SW		 711
712 err = -ERANGE;
713 if (size && size < xattr->val_len)
714 goto out;
715
716 err = xattr->val_len;
717 if (size == 0)
718 goto out;
719
720 memcpy(value, xattr->val, xattr->val_len);
721
722out:
be655596 723 spin_unlock(&ci->i_ceph_lock);
355da1eb
SW		 724 return err;
725}
726
727ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
728{
729 struct inode *inode = dentry->d_inode;
730 struct ceph_inode_info *ci = ceph_inode(inode);
881a5fa2 731 struct ceph_vxattr *vxattrs = ceph_inode_vxattrs(inode);
355da1eb
SW		 732 u32 vir_namelen = 0;
733 u32 namelen;
734 int err;
735 u32 len;
736 int i;
737
be655596 738 spin_lock(&ci->i_ceph_lock);
355da1eb
SW		 739 dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
740 ci->i_xattrs.version, ci->i_xattrs.index_version);
741
742 if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
bddfa3cc 743 (ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
355da1eb
SW		 744 goto list_xattr;
745 } else {
be655596 746 spin_unlock(&ci->i_ceph_lock);
355da1eb
SW		 747 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
748 if (err)
749 return err;
750 }
751
be655596 752 spin_lock(&ci->i_ceph_lock);
355da1eb
SW		 753
754 err = __build_xattrs(inode);
755 if (err < 0)
756 goto out;
757
758list_xattr:
3ce6cd12
AE		 759 /*
760 * Start with virtual dir xattr names (if any) (including
761 * terminating '\0' characters for each).
762 */
763 vir_namelen = ceph_vxattrs_name_size(vxattrs);
764
355da1eb 765 /* adding 1 byte per each variable due to the null termination */
b65917dd 766 namelen = ci->i_xattrs.names_size + ci->i_xattrs.count;
355da1eb 767 err = -ERANGE;
b65917dd 768 if (size && vir_namelen + namelen > size)
355da1eb
SW		 769 goto out;
770
b65917dd 771 err = namelen + vir_namelen;
355da1eb
SW		 772 if (size == 0)
773 goto out;
774
775 names = __copy_xattr_names(ci, names);
776
777 /* virtual xattr names, too */
b65917dd
SW		 778 err = namelen;
779 if (vxattrs) {
355da1eb 780 for (i = 0; vxattrs[i].name; i++) {
b65917dd
SW		 781 if (!vxattrs[i].hidden &&
782 !(vxattrs[i].exists_cb &&
783 !vxattrs[i].exists_cb(ci))) {
784 len = sprintf(names, "%s", vxattrs[i].name);
785 names += len + 1;
786 err += len + 1;
787 }
355da1eb 788 }
b65917dd 789 }
355da1eb
SW		 790
791out:
be655596 792 spin_unlock(&ci->i_ceph_lock);
355da1eb
SW		 793 return err;
794}
795
796static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
797 const char *value, size_t size, int flags)
798{
3d14c5d2 799 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
355da1eb
SW		 800 struct inode *inode = dentry->d_inode;
801 struct ceph_inode_info *ci = ceph_inode(inode);
5f21c96d 802 struct inode *parent_inode;
355da1eb 803 struct ceph_mds_request *req;
3d14c5d2 804 struct ceph_mds_client *mdsc = fsc->mdsc;
355da1eb
SW		 805 int err;
806 int i, nr_pages;
807 struct page **pages = NULL;
808 void *kaddr;
809
810 /* copy value into some pages */
811 nr_pages = calc_pages_for(0, size);
812 if (nr_pages) {
813 pages = kmalloc(sizeof(pages[0])*nr_pages, GFP_NOFS);
814 if (!pages)
815 return -ENOMEM;
816 err = -ENOMEM;
817 for (i = 0; i < nr_pages; i++) {
31459fe4 818 pages[i] = __page_cache_alloc(GFP_NOFS);
355da1eb
SW		 819 if (!pages[i]) {
820 nr_pages = i;
821 goto out;
822 }
823 kaddr = kmap(pages[i]);
824 memcpy(kaddr, value + i*PAGE_CACHE_SIZE,
825 min(PAGE_CACHE_SIZE, size-i*PAGE_CACHE_SIZE));
826 }
827 }
828
829 dout("setxattr value=%.*s\n", (int)size, value);
830
831 /* do request */
832 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETXATTR,
833 USE_AUTH_MDS);
60d87733
JL		 834 if (IS_ERR(req)) {
835 err = PTR_ERR(req);
836 goto out;
837 }
70b666c3
SW		 838 req->r_inode = inode;
839 ihold(inode);
355da1eb
SW		 840 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
841 req->r_num_caps = 1;
842 req->r_args.setxattr.flags = cpu_to_le32(flags);
843 req->r_path2 = kstrdup(name, GFP_NOFS);
844
845 req->r_pages = pages;
846 req->r_num_pages = nr_pages;
847 req->r_data_len = size;
848
849 dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
5f21c96d 850 parent_inode = ceph_get_dentry_parent_inode(dentry);
355da1eb 851 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
5f21c96d 852 iput(parent_inode);
355da1eb
SW		 853 ceph_mdsc_put_request(req);
854 dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
855
856out:
857 if (pages) {
858 for (i = 0; i < nr_pages; i++)
859 __free_page(pages[i]);
860 kfree(pages);
861 }
862 return err;
863}
864
865int ceph_setxattr(struct dentry *dentry, const char *name,
866 const void *value, size_t size, int flags)
867{
868 struct inode *inode = dentry->d_inode;
881a5fa2 869 struct ceph_vxattr *vxattr;
355da1eb 870 struct ceph_inode_info *ci = ceph_inode(inode);
18fa8b3f 871 int issued;
355da1eb 872 int err;
18fa8b3f 873 int dirty;
355da1eb
SW		 874 int name_len = strlen(name);
875 int val_len = size;
876 char *newname = NULL;
877 char *newval = NULL;
878 struct ceph_inode_xattr *xattr = NULL;
355da1eb
SW		 879 int required_blob_size;
880
881 if (ceph_snap(inode) != CEPH_NOSNAP)
882 return -EROFS;
883
884 if (!ceph_is_valid_xattr(name))
885 return -EOPNOTSUPP;
886
06476a69
AE		 887 vxattr = ceph_match_vxattr(inode, name);
888 if (vxattr && vxattr->readonly)
889 return -EOPNOTSUPP;
355da1eb 890
3adf654d
SW		 891 /* pass any unhandled ceph.* xattrs through to the MDS */
892 if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
893 goto do_sync_unlocked;
894
355da1eb
SW		 895 /* preallocate memory for xattr name, value, index node */
896 err = -ENOMEM;
61413c2f 897 newname = kmemdup(name, name_len + 1, GFP_NOFS);
355da1eb
SW		 898 if (!newname)
899 goto out;
355da1eb
SW		 900
901 if (val_len) {
b829c195 902 newval = kmemdup(value, val_len, GFP_NOFS);
355da1eb
SW		 903 if (!newval)
904 goto out;
355da1eb
SW		 905 }
906
907 xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS);
908 if (!xattr)
909 goto out;
910
be655596 911 spin_lock(&ci->i_ceph_lock);
355da1eb
SW		 912retry:
913 issued = __ceph_caps_issued(ci, NULL);
18fa8b3f 914 dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued));
355da1eb
SW		 915 if (!(issued & CEPH_CAP_XATTR_EXCL))
916 goto do_sync;
917 __build_xattrs(inode);
918
919 required_blob_size = __get_required_blob_size(ci, name_len, val_len);
920
921 if (!ci->i_xattrs.prealloc_blob ||
922 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
18fa8b3f 923 struct ceph_buffer *blob;
355da1eb 924
be655596 925 spin_unlock(&ci->i_ceph_lock);
355da1eb 926 dout(" preaallocating new blob size=%d\n", required_blob_size);
b6c1d5b8 927 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
355da1eb
SW		 928 if (!blob)
929 goto out;
be655596 930 spin_lock(&ci->i_ceph_lock);
b6c1d5b8
SW		 931 if (ci->i_xattrs.prealloc_blob)
932 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
355da1eb
SW		 933 ci->i_xattrs.prealloc_blob = blob;
934 goto retry;
935 }
936
355da1eb
SW		 937 err = __set_xattr(ci, newname, name_len, newval,
938 val_len, 1, 1, 1, &xattr);
18fa8b3f 939
fca65b4a 940 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
355da1eb
SW		 941 ci->i_xattrs.dirty = true;
942 inode->i_ctime = CURRENT_TIME;
18fa8b3f 943
be655596 944 spin_unlock(&ci->i_ceph_lock);
fca65b4a
SW		 945 if (dirty)
946 __mark_inode_dirty(inode, dirty);
355da1eb
SW		 947 return err;
948
949do_sync:
be655596 950 spin_unlock(&ci->i_ceph_lock);
3adf654d 951do_sync_unlocked:
355da1eb
SW		 952 err = ceph_sync_setxattr(dentry, name, value, size, flags);
953out:
954 kfree(newname);
955 kfree(newval);
956 kfree(xattr);
957 return err;
958}
959
960static int ceph_send_removexattr(struct dentry *dentry, const char *name)
961{
3d14c5d2
YS		 962 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
963 struct ceph_mds_client *mdsc = fsc->mdsc;
355da1eb 964 struct inode *inode = dentry->d_inode;
5f21c96d 965 struct inode *parent_inode;
355da1eb
SW		 966 struct ceph_mds_request *req;
967 int err;
968
969 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RMXATTR,
970 USE_AUTH_MDS);
971 if (IS_ERR(req))
972 return PTR_ERR(req);
70b666c3
SW		 973 req->r_inode = inode;
974 ihold(inode);
355da1eb
SW		 975 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
976 req->r_num_caps = 1;
977 req->r_path2 = kstrdup(name, GFP_NOFS);
978
5f21c96d 979 parent_inode = ceph_get_dentry_parent_inode(dentry);
355da1eb 980 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
5f21c96d 981 iput(parent_inode);
355da1eb
SW		 982 ceph_mdsc_put_request(req);
983 return err;
984}
985
986int ceph_removexattr(struct dentry *dentry, const char *name)
987{
988 struct inode *inode = dentry->d_inode;
881a5fa2 989 struct ceph_vxattr *vxattr;
355da1eb 990 struct ceph_inode_info *ci = ceph_inode(inode);
355da1eb
SW		 991 int issued;
992 int err;
83eb26af 993 int required_blob_size;
fca65b4a 994 int dirty;
355da1eb
SW		 995
996 if (ceph_snap(inode) != CEPH_NOSNAP)
997 return -EROFS;
998
999 if (!ceph_is_valid_xattr(name))
1000 return -EOPNOTSUPP;
1001
06476a69
AE		 1002 vxattr = ceph_match_vxattr(inode, name);
1003 if (vxattr && vxattr->readonly)
1004 return -EOPNOTSUPP;
355da1eb 1005
d421acb1
SW		 1006 /* pass any unhandled ceph.* xattrs through to the MDS */
1007 if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
1008 goto do_sync_unlocked;
1009
83eb26af 1010 err = -ENOMEM;
be655596 1011 spin_lock(&ci->i_ceph_lock);
83eb26af 1012retry:
355da1eb
SW		 1013 issued = __ceph_caps_issued(ci, NULL);
1014 dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued));
1015
1016 if (!(issued & CEPH_CAP_XATTR_EXCL))
1017 goto do_sync;
18fa8b3f 1018 __build_xattrs(inode);
355da1eb 1019
83eb26af
AE		 1020 required_blob_size = __get_required_blob_size(ci, 0, 0);
1021
1022 if (!ci->i_xattrs.prealloc_blob ||
1023 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
1024 struct ceph_buffer *blob;
1025
1026 spin_unlock(&ci->i_ceph_lock);
1027 dout(" preaallocating new blob size=%d\n", required_blob_size);
1028 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
1029 if (!blob)
1030 goto out;
1031 spin_lock(&ci->i_ceph_lock);
1032 if (ci->i_xattrs.prealloc_blob)
1033 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
1034 ci->i_xattrs.prealloc_blob = blob;
1035 goto retry;
1036 }
1037
355da1eb 1038 err = __remove_xattr_by_name(ceph_inode(inode), name);
18fa8b3f 1039
fca65b4a 1040 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
355da1eb
SW		 1041 ci->i_xattrs.dirty = true;
1042 inode->i_ctime = CURRENT_TIME;
be655596 1043 spin_unlock(&ci->i_ceph_lock);
fca65b4a
SW		 1044 if (dirty)
1045 __mark_inode_dirty(inode, dirty);
355da1eb
SW		 1046 return err;
1047do_sync:
be655596 1048 spin_unlock(&ci->i_ceph_lock);
d421acb1 1049do_sync_unlocked:
355da1eb 1050 err = ceph_send_removexattr(dentry, name);
83eb26af 1051out:
355da1eb
SW		 1052 return err;
1053}
1054
Linux kernel - Deliverables
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