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
ceph_is_valid_xattr(const char * name)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
ceph_vxattrcb_layout_exists(struct ceph_inode_info * ci)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
ceph_vxattrcb_layout(struct ceph_inode_info * ci,char * val,size_t size)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
ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info * ci,char * val,size_t size)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
ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info * ci,char * val,size_t size)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
ceph_vxattrcb_layout_object_size(struct ceph_inode_info * ci,char * val,size_t size)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
ceph_vxattrcb_layout_pool(struct ceph_inode_info * ci,char * val,size_t size)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
ceph_vxattrcb_dir_entries(struct ceph_inode_info * ci,char * val,size_t size)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
ceph_vxattrcb_dir_files(struct ceph_inode_info * ci,char * val,size_t size)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
ceph_vxattrcb_dir_subdirs(struct ceph_inode_info * ci,char * val,size_t size)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
ceph_vxattrcb_dir_rentries(struct ceph_inode_info * ci,char * val,size_t size)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
ceph_vxattrcb_dir_rfiles(struct ceph_inode_info * ci,char * val,size_t size)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
ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info * ci,char * val,size_t size)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
ceph_vxattrcb_dir_rbytes(struct ceph_inode_info * ci,char * val,size_t size)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
ceph_vxattrcb_dir_rctime(struct ceph_inode_info * ci,char * val,size_t size)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
ceph_inode_vxattrs(struct inode * inode)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
ceph_vxattrs_name_size(struct ceph_vxattr * vxattrs)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 */
vxattrs_name_size(struct ceph_vxattr * vxattrs)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
ceph_xattr_init(void)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
ceph_xattr_exit(void)316 void ceph_xattr_exit(void)
317 {
318 ceph_dir_vxattrs_name_size = 0;
319 ceph_file_vxattrs_name_size = 0;
320 }
321
ceph_match_vxattr(struct inode * inode,const char * name)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
__set_xattr(struct ceph_inode_info * ci,const char * name,int name_len,const char * val,int val_len,int flags,int update_xattr,struct ceph_inode_xattr ** newxattr)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
373 if (xattr && (flags & XATTR_CREATE))
374 err = -EEXIST;
375 else if (!xattr && (flags & XATTR_REPLACE))
376 err = -ENODATA;
377 if (err) {
378 kfree(name);
379 kfree(val);
380 kfree(*newxattr);
381 return err;
382 }
383 if (update_xattr < 0) {
384 if (xattr)
385 __remove_xattr(ci, xattr);
386 kfree(name);
387 kfree(*newxattr);
388 return 0;
389 }
390 }
391
392 if (!xattr) {
393 new = 1;
394 xattr = *newxattr;
395 xattr->name = name;
396 xattr->name_len = name_len;
397 xattr->should_free_name = update_xattr;
398
399 ci->i_xattrs.count++;
400 dout("__set_xattr count=%d\n", ci->i_xattrs.count);
401 } else {
402 kfree(*newxattr);
403 *newxattr = NULL;
404 if (xattr->should_free_val)
405 kfree((void *)xattr->val);
406
407 if (update_xattr) {
408 kfree((void *)name);
409 name = xattr->name;
410 }
411 ci->i_xattrs.names_size -= xattr->name_len;
412 ci->i_xattrs.vals_size -= xattr->val_len;
413 }
414 ci->i_xattrs.names_size += name_len;
415 ci->i_xattrs.vals_size += val_len;
416 if (val)
417 xattr->val = val;
418 else
419 xattr->val = "";
420
421 xattr->val_len = val_len;
422 xattr->dirty = update_xattr;
423 xattr->should_free_val = (val && update_xattr);
424
425 if (new) {
426 rb_link_node(&xattr->node, parent, p);
427 rb_insert_color(&xattr->node, &ci->i_xattrs.index);
428 dout("__set_xattr_val p=%p\n", p);
429 }
430
431 dout("__set_xattr_val added %llx.%llx xattr %p %s=%.*s\n",
432 ceph_vinop(&ci->vfs_inode), xattr, name, val_len, val);
433
434 return 0;
435 }
436
__get_xattr(struct ceph_inode_info * ci,const char * name)437 static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci,
438 const char *name)
439 {
440 struct rb_node **p;
441 struct rb_node *parent = NULL;
442 struct ceph_inode_xattr *xattr = NULL;
443 int name_len = strlen(name);
444 int c;
445
446 p = &ci->i_xattrs.index.rb_node;
447 while (*p) {
448 parent = *p;
449 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
450 c = strncmp(name, xattr->name, xattr->name_len);
451 if (c == 0 && name_len > xattr->name_len)
452 c = 1;
453 if (c < 0)
454 p = &(*p)->rb_left;
455 else if (c > 0)
456 p = &(*p)->rb_right;
457 else {
458 dout("__get_xattr %s: found %.*s\n", name,
459 xattr->val_len, xattr->val);
460 return xattr;
461 }
462 }
463
464 dout("__get_xattr %s: not found\n", name);
465
466 return NULL;
467 }
468
__free_xattr(struct ceph_inode_xattr * xattr)469 static void __free_xattr(struct ceph_inode_xattr *xattr)
470 {
471 BUG_ON(!xattr);
472
473 if (xattr->should_free_name)
474 kfree((void *)xattr->name);
475 if (xattr->should_free_val)
476 kfree((void *)xattr->val);
477
478 kfree(xattr);
479 }
480
__remove_xattr(struct ceph_inode_info * ci,struct ceph_inode_xattr * xattr)481 static int __remove_xattr(struct ceph_inode_info *ci,
482 struct ceph_inode_xattr *xattr)
483 {
484 if (!xattr)
485 return -ENODATA;
486
487 rb_erase(&xattr->node, &ci->i_xattrs.index);
488
489 if (xattr->should_free_name)
490 kfree((void *)xattr->name);
491 if (xattr->should_free_val)
492 kfree((void *)xattr->val);
493
494 ci->i_xattrs.names_size -= xattr->name_len;
495 ci->i_xattrs.vals_size -= xattr->val_len;
496 ci->i_xattrs.count--;
497 kfree(xattr);
498
499 return 0;
500 }
501
__remove_xattr_by_name(struct ceph_inode_info * ci,const char * name)502 static int __remove_xattr_by_name(struct ceph_inode_info *ci,
503 const char *name)
504 {
505 struct rb_node **p;
506 struct ceph_inode_xattr *xattr;
507 int err;
508
509 p = &ci->i_xattrs.index.rb_node;
510 xattr = __get_xattr(ci, name);
511 err = __remove_xattr(ci, xattr);
512 return err;
513 }
514
__copy_xattr_names(struct ceph_inode_info * ci,char * dest)515 static char *__copy_xattr_names(struct ceph_inode_info *ci,
516 char *dest)
517 {
518 struct rb_node *p;
519 struct ceph_inode_xattr *xattr = NULL;
520
521 p = rb_first(&ci->i_xattrs.index);
522 dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count);
523
524 while (p) {
525 xattr = rb_entry(p, struct ceph_inode_xattr, node);
526 memcpy(dest, xattr->name, xattr->name_len);
527 dest[xattr->name_len] = '\0';
528
529 dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name,
530 xattr->name_len, ci->i_xattrs.names_size);
531
532 dest += xattr->name_len + 1;
533 p = rb_next(p);
534 }
535
536 return dest;
537 }
538
__ceph_destroy_xattrs(struct ceph_inode_info * ci)539 void __ceph_destroy_xattrs(struct ceph_inode_info *ci)
540 {
541 struct rb_node *p, *tmp;
542 struct ceph_inode_xattr *xattr = NULL;
543
544 p = rb_first(&ci->i_xattrs.index);
545
546 dout("__ceph_destroy_xattrs p=%p\n", p);
547
548 while (p) {
549 xattr = rb_entry(p, struct ceph_inode_xattr, node);
550 tmp = p;
551 p = rb_next(tmp);
552 dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p,
553 xattr->name_len, xattr->name);
554 rb_erase(tmp, &ci->i_xattrs.index);
555
556 __free_xattr(xattr);
557 }
558
559 ci->i_xattrs.names_size = 0;
560 ci->i_xattrs.vals_size = 0;
561 ci->i_xattrs.index_version = 0;
562 ci->i_xattrs.count = 0;
563 ci->i_xattrs.index = RB_ROOT;
564 }
565
__build_xattrs(struct inode * inode)566 static int __build_xattrs(struct inode *inode)
567 __releases(ci->i_ceph_lock)
568 __acquires(ci->i_ceph_lock)
569 {
570 u32 namelen;
571 u32 numattr = 0;
572 void *p, *end;
573 u32 len;
574 const char *name, *val;
575 struct ceph_inode_info *ci = ceph_inode(inode);
576 int xattr_version;
577 struct ceph_inode_xattr **xattrs = NULL;
578 int err = 0;
579 int i;
580
581 dout("__build_xattrs() len=%d\n",
582 ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0);
583
584 if (ci->i_xattrs.index_version >= ci->i_xattrs.version)
585 return 0; /* already built */
586
587 __ceph_destroy_xattrs(ci);
588
589 start:
590 /* updated internal xattr rb tree */
591 if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) {
592 p = ci->i_xattrs.blob->vec.iov_base;
593 end = p + ci->i_xattrs.blob->vec.iov_len;
594 ceph_decode_32_safe(&p, end, numattr, bad);
595 xattr_version = ci->i_xattrs.version;
596 spin_unlock(&ci->i_ceph_lock);
597
598 xattrs = kcalloc(numattr, sizeof(struct ceph_inode_xattr *),
599 GFP_NOFS);
600 err = -ENOMEM;
601 if (!xattrs)
602 goto bad_lock;
603
604 for (i = 0; i < numattr; i++) {
605 xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr),
606 GFP_NOFS);
607 if (!xattrs[i])
608 goto bad_lock;
609 }
610
611 spin_lock(&ci->i_ceph_lock);
612 if (ci->i_xattrs.version != xattr_version) {
613 /* lost a race, retry */
614 for (i = 0; i < numattr; i++)
615 kfree(xattrs[i]);
616 kfree(xattrs);
617 xattrs = NULL;
618 goto start;
619 }
620 err = -EIO;
621 while (numattr--) {
622 ceph_decode_32_safe(&p, end, len, bad);
623 namelen = len;
624 name = p;
625 p += len;
626 ceph_decode_32_safe(&p, end, len, bad);
627 val = p;
628 p += len;
629
630 err = __set_xattr(ci, name, namelen, val, len,
631 0, 0, &xattrs[numattr]);
632
633 if (err < 0)
634 goto bad;
635 }
636 kfree(xattrs);
637 }
638 ci->i_xattrs.index_version = ci->i_xattrs.version;
639 ci->i_xattrs.dirty = false;
640
641 return err;
642 bad_lock:
643 spin_lock(&ci->i_ceph_lock);
644 bad:
645 if (xattrs) {
646 for (i = 0; i < numattr; i++)
647 kfree(xattrs[i]);
648 kfree(xattrs);
649 }
650 ci->i_xattrs.names_size = 0;
651 return err;
652 }
653
__get_required_blob_size(struct ceph_inode_info * ci,int name_size,int val_size)654 static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size,
655 int val_size)
656 {
657 /*
658 * 4 bytes for the length, and additional 4 bytes per each xattr name,
659 * 4 bytes per each value
660 */
661 int size = 4 + ci->i_xattrs.count*(4 + 4) +
662 ci->i_xattrs.names_size +
663 ci->i_xattrs.vals_size;
664 dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n",
665 ci->i_xattrs.count, ci->i_xattrs.names_size,
666 ci->i_xattrs.vals_size);
667
668 if (name_size)
669 size += 4 + 4 + name_size + val_size;
670
671 return size;
672 }
673
674 /*
675 * If there are dirty xattrs, reencode xattrs into the prealloc_blob
676 * and swap into place.
677 */
__ceph_build_xattrs_blob(struct ceph_inode_info * ci)678 void __ceph_build_xattrs_blob(struct ceph_inode_info *ci)
679 {
680 struct rb_node *p;
681 struct ceph_inode_xattr *xattr = NULL;
682 void *dest;
683
684 dout("__build_xattrs_blob %p\n", &ci->vfs_inode);
685 if (ci->i_xattrs.dirty) {
686 int need = __get_required_blob_size(ci, 0, 0);
687
688 BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len);
689
690 p = rb_first(&ci->i_xattrs.index);
691 dest = ci->i_xattrs.prealloc_blob->vec.iov_base;
692
693 ceph_encode_32(&dest, ci->i_xattrs.count);
694 while (p) {
695 xattr = rb_entry(p, struct ceph_inode_xattr, node);
696
697 ceph_encode_32(&dest, xattr->name_len);
698 memcpy(dest, xattr->name, xattr->name_len);
699 dest += xattr->name_len;
700 ceph_encode_32(&dest, xattr->val_len);
701 memcpy(dest, xattr->val, xattr->val_len);
702 dest += xattr->val_len;
703
704 p = rb_next(p);
705 }
706
707 /* adjust buffer len; it may be larger than we need */
708 ci->i_xattrs.prealloc_blob->vec.iov_len =
709 dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
710
711 if (ci->i_xattrs.blob)
712 ceph_buffer_put(ci->i_xattrs.blob);
713 ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
714 ci->i_xattrs.prealloc_blob = NULL;
715 ci->i_xattrs.dirty = false;
716 ci->i_xattrs.version++;
717 }
718 }
719
__ceph_getxattr(struct inode * inode,const char * name,void * value,size_t size)720 ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
721 size_t size)
722 {
723 struct ceph_inode_info *ci = ceph_inode(inode);
724 int err;
725 struct ceph_inode_xattr *xattr;
726 struct ceph_vxattr *vxattr = NULL;
727
728 if (!ceph_is_valid_xattr(name))
729 return -ENODATA;
730
731 /* let's see if a virtual xattr was requested */
732 vxattr = ceph_match_vxattr(inode, name);
733 if (vxattr && !(vxattr->exists_cb && !vxattr->exists_cb(ci))) {
734 err = vxattr->getxattr_cb(ci, value, size);
735 return err;
736 }
737
738 spin_lock(&ci->i_ceph_lock);
739 dout("getxattr %p ver=%lld index_ver=%lld\n", inode,
740 ci->i_xattrs.version, ci->i_xattrs.index_version);
741
742 if (ci->i_xattrs.version == 0 ||
743 !__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1)) {
744 spin_unlock(&ci->i_ceph_lock);
745 /* get xattrs from mds (if we don't already have them) */
746 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
747 if (err)
748 return err;
749 spin_lock(&ci->i_ceph_lock);
750 }
751
752 err = __build_xattrs(inode);
753 if (err < 0)
754 goto out;
755
756 err = -ENODATA; /* == ENOATTR */
757 xattr = __get_xattr(ci, name);
758 if (!xattr)
759 goto out;
760
761 err = -ERANGE;
762 if (size && size < xattr->val_len)
763 goto out;
764
765 err = xattr->val_len;
766 if (size == 0)
767 goto out;
768
769 memcpy(value, xattr->val, xattr->val_len);
770
771 out:
772 spin_unlock(&ci->i_ceph_lock);
773 return err;
774 }
775
ceph_getxattr(struct dentry * dentry,const char * name,void * value,size_t size)776 ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
777 size_t size)
778 {
779 if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
780 return generic_getxattr(dentry, name, value, size);
781
782 return __ceph_getxattr(d_inode(dentry), name, value, size);
783 }
784
ceph_listxattr(struct dentry * dentry,char * names,size_t size)785 ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
786 {
787 struct inode *inode = d_inode(dentry);
788 struct ceph_inode_info *ci = ceph_inode(inode);
789 struct ceph_vxattr *vxattrs = ceph_inode_vxattrs(inode);
790 u32 vir_namelen = 0;
791 u32 namelen;
792 int err;
793 u32 len;
794 int i;
795
796 spin_lock(&ci->i_ceph_lock);
797 dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
798 ci->i_xattrs.version, ci->i_xattrs.index_version);
799
800 if (ci->i_xattrs.version == 0 ||
801 !__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1)) {
802 spin_unlock(&ci->i_ceph_lock);
803 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
804 if (err)
805 return err;
806 spin_lock(&ci->i_ceph_lock);
807 }
808
809 err = __build_xattrs(inode);
810 if (err < 0)
811 goto out;
812 /*
813 * Start with virtual dir xattr names (if any) (including
814 * terminating '\0' characters for each).
815 */
816 vir_namelen = ceph_vxattrs_name_size(vxattrs);
817
818 /* adding 1 byte per each variable due to the null termination */
819 namelen = ci->i_xattrs.names_size + ci->i_xattrs.count;
820 err = -ERANGE;
821 if (size && vir_namelen + namelen > size)
822 goto out;
823
824 err = namelen + vir_namelen;
825 if (size == 0)
826 goto out;
827
828 names = __copy_xattr_names(ci, names);
829
830 /* virtual xattr names, too */
831 err = namelen;
832 if (vxattrs) {
833 for (i = 0; vxattrs[i].name; i++) {
834 if (!vxattrs[i].hidden &&
835 !(vxattrs[i].exists_cb &&
836 !vxattrs[i].exists_cb(ci))) {
837 len = sprintf(names, "%s", vxattrs[i].name);
838 names += len + 1;
839 err += len + 1;
840 }
841 }
842 }
843
844 out:
845 spin_unlock(&ci->i_ceph_lock);
846 return err;
847 }
848
ceph_sync_setxattr(struct dentry * dentry,const char * name,const char * value,size_t size,int flags)849 static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
850 const char *value, size_t size, int flags)
851 {
852 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
853 struct inode *inode = d_inode(dentry);
854 struct ceph_inode_info *ci = ceph_inode(inode);
855 struct ceph_mds_request *req;
856 struct ceph_mds_client *mdsc = fsc->mdsc;
857 struct ceph_pagelist *pagelist = NULL;
858 int err;
859
860 if (size > 0) {
861 /* copy value into pagelist */
862 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
863 if (!pagelist)
864 return -ENOMEM;
865
866 ceph_pagelist_init(pagelist);
867 err = ceph_pagelist_append(pagelist, value, size);
868 if (err)
869 goto out;
870 } else if (!value) {
871 flags |= CEPH_XATTR_REMOVE;
872 }
873
874 dout("setxattr value=%.*s\n", (int)size, value);
875
876 /* do request */
877 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETXATTR,
878 USE_AUTH_MDS);
879 if (IS_ERR(req)) {
880 err = PTR_ERR(req);
881 goto out;
882 }
883
884 req->r_args.setxattr.flags = cpu_to_le32(flags);
885 req->r_path2 = kstrdup(name, GFP_NOFS);
886 if (!req->r_path2) {
887 ceph_mdsc_put_request(req);
888 err = -ENOMEM;
889 goto out;
890 }
891
892 req->r_pagelist = pagelist;
893 pagelist = NULL;
894
895 req->r_inode = inode;
896 ihold(inode);
897 req->r_num_caps = 1;
898 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
899
900 dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
901 err = ceph_mdsc_do_request(mdsc, NULL, req);
902 ceph_mdsc_put_request(req);
903 dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
904
905 out:
906 if (pagelist)
907 ceph_pagelist_release(pagelist);
908 return err;
909 }
910
__ceph_setxattr(struct dentry * dentry,const char * name,const void * value,size_t size,int flags)911 int __ceph_setxattr(struct dentry *dentry, const char *name,
912 const void *value, size_t size, int flags)
913 {
914 struct inode *inode = d_inode(dentry);
915 struct ceph_vxattr *vxattr;
916 struct ceph_inode_info *ci = ceph_inode(inode);
917 struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
918 struct ceph_cap_flush *prealloc_cf = NULL;
919 struct ceph_buffer *old_blob = NULL;
920 int issued;
921 int err;
922 int dirty = 0;
923 int name_len = strlen(name);
924 int val_len = size;
925 char *newname = NULL;
926 char *newval = NULL;
927 struct ceph_inode_xattr *xattr = NULL;
928 int required_blob_size;
929 bool lock_snap_rwsem = false;
930
931 if (!ceph_is_valid_xattr(name))
932 return -EOPNOTSUPP;
933
934 vxattr = ceph_match_vxattr(inode, name);
935 if (vxattr && vxattr->readonly)
936 return -EOPNOTSUPP;
937
938 /* pass any unhandled ceph.* xattrs through to the MDS */
939 if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
940 goto do_sync_unlocked;
941
942 /* preallocate memory for xattr name, value, index node */
943 err = -ENOMEM;
944 newname = kmemdup(name, name_len + 1, GFP_NOFS);
945 if (!newname)
946 goto out;
947
948 if (val_len) {
949 newval = kmemdup(value, val_len, GFP_NOFS);
950 if (!newval)
951 goto out;
952 }
953
954 xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS);
955 if (!xattr)
956 goto out;
957
958 prealloc_cf = ceph_alloc_cap_flush();
959 if (!prealloc_cf)
960 goto out;
961
962 spin_lock(&ci->i_ceph_lock);
963 retry:
964 issued = __ceph_caps_issued(ci, NULL);
965 if (ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))
966 goto do_sync;
967
968 if (!lock_snap_rwsem && !ci->i_head_snapc) {
969 lock_snap_rwsem = true;
970 if (!down_read_trylock(&mdsc->snap_rwsem)) {
971 spin_unlock(&ci->i_ceph_lock);
972 down_read(&mdsc->snap_rwsem);
973 spin_lock(&ci->i_ceph_lock);
974 goto retry;
975 }
976 }
977
978 dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued));
979 __build_xattrs(inode);
980
981 required_blob_size = __get_required_blob_size(ci, name_len, val_len);
982
983 if (!ci->i_xattrs.prealloc_blob ||
984 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
985 struct ceph_buffer *blob;
986
987 spin_unlock(&ci->i_ceph_lock);
988 ceph_buffer_put(old_blob); /* Shouldn't be required */
989 dout(" pre-allocating new blob size=%d\n", required_blob_size);
990 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
991 if (!blob)
992 goto do_sync_unlocked;
993 spin_lock(&ci->i_ceph_lock);
994 /* prealloc_blob can't be released while holding i_ceph_lock */
995 if (ci->i_xattrs.prealloc_blob)
996 old_blob = ci->i_xattrs.prealloc_blob;
997 ci->i_xattrs.prealloc_blob = blob;
998 goto retry;
999 }
1000
1001 err = __set_xattr(ci, newname, name_len, newval, val_len,
1002 flags, value ? 1 : -1, &xattr);
1003
1004 if (!err) {
1005 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL,
1006 &prealloc_cf);
1007 ci->i_xattrs.dirty = true;
1008 inode->i_ctime = CURRENT_TIME;
1009 }
1010
1011 spin_unlock(&ci->i_ceph_lock);
1012 ceph_buffer_put(old_blob);
1013 if (lock_snap_rwsem)
1014 up_read(&mdsc->snap_rwsem);
1015 if (dirty)
1016 __mark_inode_dirty(inode, dirty);
1017 ceph_free_cap_flush(prealloc_cf);
1018 return err;
1019
1020 do_sync:
1021 spin_unlock(&ci->i_ceph_lock);
1022 do_sync_unlocked:
1023 if (lock_snap_rwsem)
1024 up_read(&mdsc->snap_rwsem);
1025 err = ceph_sync_setxattr(dentry, name, value, size, flags);
1026 out:
1027 ceph_free_cap_flush(prealloc_cf);
1028 kfree(newname);
1029 kfree(newval);
1030 kfree(xattr);
1031 return err;
1032 }
1033
ceph_setxattr(struct dentry * dentry,const char * name,const void * value,size_t size,int flags)1034 int ceph_setxattr(struct dentry *dentry, const char *name,
1035 const void *value, size_t size, int flags)
1036 {
1037 if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
1038 return -EROFS;
1039
1040 if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
1041 return generic_setxattr(dentry, name, value, size, flags);
1042
1043 if (size == 0)
1044 value = ""; /* empty EA, do not remove */
1045
1046 return __ceph_setxattr(dentry, name, value, size, flags);
1047 }
1048
ceph_send_removexattr(struct dentry * dentry,const char * name)1049 static int ceph_send_removexattr(struct dentry *dentry, const char *name)
1050 {
1051 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
1052 struct ceph_mds_client *mdsc = fsc->mdsc;
1053 struct inode *inode = d_inode(dentry);
1054 struct ceph_mds_request *req;
1055 int err;
1056
1057 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RMXATTR,
1058 USE_AUTH_MDS);
1059 if (IS_ERR(req))
1060 return PTR_ERR(req);
1061 req->r_path2 = kstrdup(name, GFP_NOFS);
1062 if (!req->r_path2)
1063 return -ENOMEM;
1064
1065 req->r_inode = inode;
1066 ihold(inode);
1067 req->r_num_caps = 1;
1068 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
1069 err = ceph_mdsc_do_request(mdsc, NULL, req);
1070 ceph_mdsc_put_request(req);
1071 return err;
1072 }
1073
__ceph_removexattr(struct dentry * dentry,const char * name)1074 int __ceph_removexattr(struct dentry *dentry, const char *name)
1075 {
1076 struct inode *inode = d_inode(dentry);
1077 struct ceph_vxattr *vxattr;
1078 struct ceph_inode_info *ci = ceph_inode(inode);
1079 struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1080 struct ceph_cap_flush *prealloc_cf = NULL;
1081 int issued;
1082 int err;
1083 int required_blob_size;
1084 int dirty;
1085 bool lock_snap_rwsem = false;
1086
1087 if (!ceph_is_valid_xattr(name))
1088 return -EOPNOTSUPP;
1089
1090 vxattr = ceph_match_vxattr(inode, name);
1091 if (vxattr && vxattr->readonly)
1092 return -EOPNOTSUPP;
1093
1094 /* pass any unhandled ceph.* xattrs through to the MDS */
1095 if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
1096 goto do_sync_unlocked;
1097
1098 prealloc_cf = ceph_alloc_cap_flush();
1099 if (!prealloc_cf)
1100 return -ENOMEM;
1101
1102 err = -ENOMEM;
1103 spin_lock(&ci->i_ceph_lock);
1104 retry:
1105 issued = __ceph_caps_issued(ci, NULL);
1106 if (ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))
1107 goto do_sync;
1108
1109 if (!lock_snap_rwsem && !ci->i_head_snapc) {
1110 lock_snap_rwsem = true;
1111 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1112 spin_unlock(&ci->i_ceph_lock);
1113 down_read(&mdsc->snap_rwsem);
1114 spin_lock(&ci->i_ceph_lock);
1115 goto retry;
1116 }
1117 }
1118
1119 dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued));
1120
1121 __build_xattrs(inode);
1122
1123 required_blob_size = __get_required_blob_size(ci, 0, 0);
1124
1125 if (!ci->i_xattrs.prealloc_blob ||
1126 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
1127 struct ceph_buffer *blob;
1128
1129 spin_unlock(&ci->i_ceph_lock);
1130 dout(" preaallocating new blob size=%d\n", required_blob_size);
1131 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
1132 if (!blob)
1133 goto do_sync_unlocked;
1134 spin_lock(&ci->i_ceph_lock);
1135 if (ci->i_xattrs.prealloc_blob)
1136 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
1137 ci->i_xattrs.prealloc_blob = blob;
1138 goto retry;
1139 }
1140
1141 err = __remove_xattr_by_name(ceph_inode(inode), name);
1142
1143 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL,
1144 &prealloc_cf);
1145 ci->i_xattrs.dirty = true;
1146 inode->i_ctime = CURRENT_TIME;
1147 spin_unlock(&ci->i_ceph_lock);
1148 if (lock_snap_rwsem)
1149 up_read(&mdsc->snap_rwsem);
1150 if (dirty)
1151 __mark_inode_dirty(inode, dirty);
1152 ceph_free_cap_flush(prealloc_cf);
1153 return err;
1154 do_sync:
1155 spin_unlock(&ci->i_ceph_lock);
1156 do_sync_unlocked:
1157 if (lock_snap_rwsem)
1158 up_read(&mdsc->snap_rwsem);
1159 ceph_free_cap_flush(prealloc_cf);
1160 err = ceph_send_removexattr(dentry, name);
1161 return err;
1162 }
1163
ceph_removexattr(struct dentry * dentry,const char * name)1164 int ceph_removexattr(struct dentry *dentry, const char *name)
1165 {
1166 if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
1167 return -EROFS;
1168
1169 if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
1170 return generic_removexattr(dentry, name);
1171
1172 return __ceph_removexattr(dentry, name);
1173 }
1174