Commit | Line | Data |
---|---|---|
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 |
14 | static 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 | 27 | struct 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 | ||
36 | /* directories */ | |
37 | ||
aa4066ed | 38 | static size_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val, |
355da1eb SW |
39 | size_t size) |
40 | { | |
41 | return snprintf(val, size, "%lld", ci->i_files + ci->i_subdirs); | |
42 | } | |
43 | ||
aa4066ed | 44 | static size_t ceph_vxattrcb_dir_files(struct ceph_inode_info *ci, char *val, |
355da1eb SW |
45 | size_t size) |
46 | { | |
47 | return snprintf(val, size, "%lld", ci->i_files); | |
48 | } | |
49 | ||
aa4066ed | 50 | static size_t ceph_vxattrcb_dir_subdirs(struct ceph_inode_info *ci, char *val, |
355da1eb SW |
51 | size_t size) |
52 | { | |
53 | return snprintf(val, size, "%lld", ci->i_subdirs); | |
54 | } | |
55 | ||
aa4066ed | 56 | static size_t ceph_vxattrcb_dir_rentries(struct ceph_inode_info *ci, char *val, |
355da1eb SW |
57 | size_t size) |
58 | { | |
59 | return snprintf(val, size, "%lld", ci->i_rfiles + ci->i_rsubdirs); | |
60 | } | |
61 | ||
aa4066ed | 62 | static size_t ceph_vxattrcb_dir_rfiles(struct ceph_inode_info *ci, char *val, |
355da1eb SW |
63 | size_t size) |
64 | { | |
65 | return snprintf(val, size, "%lld", ci->i_rfiles); | |
66 | } | |
67 | ||
aa4066ed | 68 | static size_t ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info *ci, char *val, |
355da1eb SW |
69 | size_t size) |
70 | { | |
71 | return snprintf(val, size, "%lld", ci->i_rsubdirs); | |
72 | } | |
73 | ||
aa4066ed | 74 | static size_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val, |
355da1eb SW |
75 | size_t size) |
76 | { | |
77 | return snprintf(val, size, "%lld", ci->i_rbytes); | |
78 | } | |
79 | ||
aa4066ed | 80 | static size_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val, |
355da1eb SW |
81 | size_t size) |
82 | { | |
3489b42a | 83 | return snprintf(val, size, "%ld.09%ld", (long)ci->i_rctime.tv_sec, |
355da1eb SW |
84 | (long)ci->i_rctime.tv_nsec); |
85 | } | |
86 | ||
eb788084 AE |
87 | #define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name |
88 | ||
8860147a SW |
89 | #define XATTR_NAME_CEPH(_type, _name) \ |
90 | { \ | |
91 | .name = CEPH_XATTR_NAME(_type, _name), \ | |
92 | .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \ | |
93 | .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \ | |
94 | .readonly = true, \ | |
95 | .hidden = false, \ | |
f36e4472 | 96 | .exists_cb = NULL, \ |
8860147a | 97 | } |
eb788084 | 98 | |
881a5fa2 | 99 | static struct ceph_vxattr ceph_dir_vxattrs[] = { |
eb788084 AE |
100 | XATTR_NAME_CEPH(dir, entries), |
101 | XATTR_NAME_CEPH(dir, files), | |
102 | XATTR_NAME_CEPH(dir, subdirs), | |
103 | XATTR_NAME_CEPH(dir, rentries), | |
104 | XATTR_NAME_CEPH(dir, rfiles), | |
105 | XATTR_NAME_CEPH(dir, rsubdirs), | |
106 | XATTR_NAME_CEPH(dir, rbytes), | |
107 | XATTR_NAME_CEPH(dir, rctime), | |
108 | { 0 } /* Required table terminator */ | |
355da1eb | 109 | }; |
3ce6cd12 | 110 | static size_t ceph_dir_vxattrs_name_size; /* total size of all names */ |
355da1eb SW |
111 | |
112 | /* files */ | |
113 | ||
aa4066ed | 114 | static size_t ceph_vxattrcb_file_layout(struct ceph_inode_info *ci, char *val, |
355da1eb SW |
115 | size_t size) |
116 | { | |
b195befd SW |
117 | int ret; |
118 | ||
119 | ret = snprintf(val, size, | |
355da1eb SW |
120 | "chunk_bytes=%lld\nstripe_count=%lld\nobject_size=%lld\n", |
121 | (unsigned long long)ceph_file_layout_su(ci->i_layout), | |
122 | (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout), | |
123 | (unsigned long long)ceph_file_layout_object_size(ci->i_layout)); | |
b195befd | 124 | return ret; |
355da1eb SW |
125 | } |
126 | ||
881a5fa2 | 127 | static struct ceph_vxattr ceph_file_vxattrs[] = { |
eb788084 | 128 | XATTR_NAME_CEPH(file, layout), |
eb788084 | 129 | { 0 } /* Required table terminator */ |
355da1eb | 130 | }; |
3ce6cd12 | 131 | static size_t ceph_file_vxattrs_name_size; /* total size of all names */ |
355da1eb | 132 | |
881a5fa2 | 133 | static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode) |
355da1eb SW |
134 | { |
135 | if (S_ISDIR(inode->i_mode)) | |
136 | return ceph_dir_vxattrs; | |
137 | else if (S_ISREG(inode->i_mode)) | |
138 | return ceph_file_vxattrs; | |
139 | return NULL; | |
140 | } | |
141 | ||
3ce6cd12 AE |
142 | static size_t ceph_vxattrs_name_size(struct ceph_vxattr *vxattrs) |
143 | { | |
144 | if (vxattrs == ceph_dir_vxattrs) | |
145 | return ceph_dir_vxattrs_name_size; | |
146 | if (vxattrs == ceph_file_vxattrs) | |
147 | return ceph_file_vxattrs_name_size; | |
148 | BUG(); | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | /* | |
154 | * Compute the aggregate size (including terminating '\0') of all | |
155 | * virtual extended attribute names in the given vxattr table. | |
156 | */ | |
157 | static size_t __init vxattrs_name_size(struct ceph_vxattr *vxattrs) | |
158 | { | |
159 | struct ceph_vxattr *vxattr; | |
160 | size_t size = 0; | |
161 | ||
162 | for (vxattr = vxattrs; vxattr->name; vxattr++) | |
8860147a SW |
163 | if (!vxattr->hidden) |
164 | size += vxattr->name_size; | |
3ce6cd12 AE |
165 | |
166 | return size; | |
167 | } | |
168 | ||
169 | /* Routines called at initialization and exit time */ | |
170 | ||
171 | void __init ceph_xattr_init(void) | |
172 | { | |
173 | ceph_dir_vxattrs_name_size = vxattrs_name_size(ceph_dir_vxattrs); | |
174 | ceph_file_vxattrs_name_size = vxattrs_name_size(ceph_file_vxattrs); | |
175 | } | |
176 | ||
177 | void ceph_xattr_exit(void) | |
178 | { | |
179 | ceph_dir_vxattrs_name_size = 0; | |
180 | ceph_file_vxattrs_name_size = 0; | |
181 | } | |
182 | ||
881a5fa2 | 183 | static struct ceph_vxattr *ceph_match_vxattr(struct inode *inode, |
355da1eb SW |
184 | const char *name) |
185 | { | |
881a5fa2 | 186 | struct ceph_vxattr *vxattr = ceph_inode_vxattrs(inode); |
06476a69 AE |
187 | |
188 | if (vxattr) { | |
189 | while (vxattr->name) { | |
190 | if (!strcmp(vxattr->name, name)) | |
191 | return vxattr; | |
192 | vxattr++; | |
193 | } | |
194 | } | |
195 | ||
355da1eb SW |
196 | return NULL; |
197 | } | |
198 | ||
199 | static int __set_xattr(struct ceph_inode_info *ci, | |
200 | const char *name, int name_len, | |
201 | const char *val, int val_len, | |
202 | int dirty, | |
203 | int should_free_name, int should_free_val, | |
204 | struct ceph_inode_xattr **newxattr) | |
205 | { | |
206 | struct rb_node **p; | |
207 | struct rb_node *parent = NULL; | |
208 | struct ceph_inode_xattr *xattr = NULL; | |
209 | int c; | |
210 | int new = 0; | |
211 | ||
212 | p = &ci->i_xattrs.index.rb_node; | |
213 | while (*p) { | |
214 | parent = *p; | |
215 | xattr = rb_entry(parent, struct ceph_inode_xattr, node); | |
216 | c = strncmp(name, xattr->name, min(name_len, xattr->name_len)); | |
217 | if (c < 0) | |
218 | p = &(*p)->rb_left; | |
219 | else if (c > 0) | |
220 | p = &(*p)->rb_right; | |
221 | else { | |
222 | if (name_len == xattr->name_len) | |
223 | break; | |
224 | else if (name_len < xattr->name_len) | |
225 | p = &(*p)->rb_left; | |
226 | else | |
227 | p = &(*p)->rb_right; | |
228 | } | |
229 | xattr = NULL; | |
230 | } | |
231 | ||
232 | if (!xattr) { | |
233 | new = 1; | |
234 | xattr = *newxattr; | |
235 | xattr->name = name; | |
236 | xattr->name_len = name_len; | |
237 | xattr->should_free_name = should_free_name; | |
238 | ||
239 | ci->i_xattrs.count++; | |
240 | dout("__set_xattr count=%d\n", ci->i_xattrs.count); | |
241 | } else { | |
242 | kfree(*newxattr); | |
243 | *newxattr = NULL; | |
244 | if (xattr->should_free_val) | |
245 | kfree((void *)xattr->val); | |
246 | ||
247 | if (should_free_name) { | |
248 | kfree((void *)name); | |
249 | name = xattr->name; | |
250 | } | |
251 | ci->i_xattrs.names_size -= xattr->name_len; | |
252 | ci->i_xattrs.vals_size -= xattr->val_len; | |
253 | } | |
355da1eb SW |
254 | ci->i_xattrs.names_size += name_len; |
255 | ci->i_xattrs.vals_size += val_len; | |
256 | if (val) | |
257 | xattr->val = val; | |
258 | else | |
259 | xattr->val = ""; | |
260 | ||
261 | xattr->val_len = val_len; | |
262 | xattr->dirty = dirty; | |
263 | xattr->should_free_val = (val && should_free_val); | |
264 | ||
265 | if (new) { | |
266 | rb_link_node(&xattr->node, parent, p); | |
267 | rb_insert_color(&xattr->node, &ci->i_xattrs.index); | |
268 | dout("__set_xattr_val p=%p\n", p); | |
269 | } | |
270 | ||
271 | dout("__set_xattr_val added %llx.%llx xattr %p %s=%.*s\n", | |
272 | ceph_vinop(&ci->vfs_inode), xattr, name, val_len, val); | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
277 | static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci, | |
278 | const char *name) | |
279 | { | |
280 | struct rb_node **p; | |
281 | struct rb_node *parent = NULL; | |
282 | struct ceph_inode_xattr *xattr = NULL; | |
17db143f | 283 | int name_len = strlen(name); |
355da1eb SW |
284 | int c; |
285 | ||
286 | p = &ci->i_xattrs.index.rb_node; | |
287 | while (*p) { | |
288 | parent = *p; | |
289 | xattr = rb_entry(parent, struct ceph_inode_xattr, node); | |
290 | c = strncmp(name, xattr->name, xattr->name_len); | |
17db143f SW |
291 | if (c == 0 && name_len > xattr->name_len) |
292 | c = 1; | |
355da1eb SW |
293 | if (c < 0) |
294 | p = &(*p)->rb_left; | |
295 | else if (c > 0) | |
296 | p = &(*p)->rb_right; | |
297 | else { | |
298 | dout("__get_xattr %s: found %.*s\n", name, | |
299 | xattr->val_len, xattr->val); | |
300 | return xattr; | |
301 | } | |
302 | } | |
303 | ||
304 | dout("__get_xattr %s: not found\n", name); | |
305 | ||
306 | return NULL; | |
307 | } | |
308 | ||
309 | static void __free_xattr(struct ceph_inode_xattr *xattr) | |
310 | { | |
311 | BUG_ON(!xattr); | |
312 | ||
313 | if (xattr->should_free_name) | |
314 | kfree((void *)xattr->name); | |
315 | if (xattr->should_free_val) | |
316 | kfree((void *)xattr->val); | |
317 | ||
318 | kfree(xattr); | |
319 | } | |
320 | ||
321 | static int __remove_xattr(struct ceph_inode_info *ci, | |
322 | struct ceph_inode_xattr *xattr) | |
323 | { | |
324 | if (!xattr) | |
325 | return -EOPNOTSUPP; | |
326 | ||
327 | rb_erase(&xattr->node, &ci->i_xattrs.index); | |
328 | ||
329 | if (xattr->should_free_name) | |
330 | kfree((void *)xattr->name); | |
331 | if (xattr->should_free_val) | |
332 | kfree((void *)xattr->val); | |
333 | ||
334 | ci->i_xattrs.names_size -= xattr->name_len; | |
335 | ci->i_xattrs.vals_size -= xattr->val_len; | |
336 | ci->i_xattrs.count--; | |
337 | kfree(xattr); | |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
342 | static int __remove_xattr_by_name(struct ceph_inode_info *ci, | |
343 | const char *name) | |
344 | { | |
345 | struct rb_node **p; | |
346 | struct ceph_inode_xattr *xattr; | |
347 | int err; | |
348 | ||
349 | p = &ci->i_xattrs.index.rb_node; | |
350 | xattr = __get_xattr(ci, name); | |
351 | err = __remove_xattr(ci, xattr); | |
352 | return err; | |
353 | } | |
354 | ||
355 | static char *__copy_xattr_names(struct ceph_inode_info *ci, | |
356 | char *dest) | |
357 | { | |
358 | struct rb_node *p; | |
359 | struct ceph_inode_xattr *xattr = NULL; | |
360 | ||
361 | p = rb_first(&ci->i_xattrs.index); | |
362 | dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count); | |
363 | ||
364 | while (p) { | |
365 | xattr = rb_entry(p, struct ceph_inode_xattr, node); | |
366 | memcpy(dest, xattr->name, xattr->name_len); | |
367 | dest[xattr->name_len] = '\0'; | |
368 | ||
369 | dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name, | |
370 | xattr->name_len, ci->i_xattrs.names_size); | |
371 | ||
372 | dest += xattr->name_len + 1; | |
373 | p = rb_next(p); | |
374 | } | |
375 | ||
376 | return dest; | |
377 | } | |
378 | ||
379 | void __ceph_destroy_xattrs(struct ceph_inode_info *ci) | |
380 | { | |
381 | struct rb_node *p, *tmp; | |
382 | struct ceph_inode_xattr *xattr = NULL; | |
383 | ||
384 | p = rb_first(&ci->i_xattrs.index); | |
385 | ||
386 | dout("__ceph_destroy_xattrs p=%p\n", p); | |
387 | ||
388 | while (p) { | |
389 | xattr = rb_entry(p, struct ceph_inode_xattr, node); | |
390 | tmp = p; | |
391 | p = rb_next(tmp); | |
392 | dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p, | |
393 | xattr->name_len, xattr->name); | |
394 | rb_erase(tmp, &ci->i_xattrs.index); | |
395 | ||
396 | __free_xattr(xattr); | |
397 | } | |
398 | ||
399 | ci->i_xattrs.names_size = 0; | |
400 | ci->i_xattrs.vals_size = 0; | |
401 | ci->i_xattrs.index_version = 0; | |
402 | ci->i_xattrs.count = 0; | |
403 | ci->i_xattrs.index = RB_ROOT; | |
404 | } | |
405 | ||
406 | static int __build_xattrs(struct inode *inode) | |
be655596 SW |
407 | __releases(ci->i_ceph_lock) |
408 | __acquires(ci->i_ceph_lock) | |
355da1eb SW |
409 | { |
410 | u32 namelen; | |
411 | u32 numattr = 0; | |
412 | void *p, *end; | |
413 | u32 len; | |
414 | const char *name, *val; | |
415 | struct ceph_inode_info *ci = ceph_inode(inode); | |
416 | int xattr_version; | |
417 | struct ceph_inode_xattr **xattrs = NULL; | |
63ff78b2 | 418 | int err = 0; |
355da1eb SW |
419 | int i; |
420 | ||
421 | dout("__build_xattrs() len=%d\n", | |
422 | ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0); | |
423 | ||
424 | if (ci->i_xattrs.index_version >= ci->i_xattrs.version) | |
425 | return 0; /* already built */ | |
426 | ||
427 | __ceph_destroy_xattrs(ci); | |
428 | ||
429 | start: | |
430 | /* updated internal xattr rb tree */ | |
431 | if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) { | |
432 | p = ci->i_xattrs.blob->vec.iov_base; | |
433 | end = p + ci->i_xattrs.blob->vec.iov_len; | |
434 | ceph_decode_32_safe(&p, end, numattr, bad); | |
435 | xattr_version = ci->i_xattrs.version; | |
be655596 | 436 | spin_unlock(&ci->i_ceph_lock); |
355da1eb SW |
437 | |
438 | xattrs = kcalloc(numattr, sizeof(struct ceph_xattr *), | |
439 | GFP_NOFS); | |
440 | err = -ENOMEM; | |
441 | if (!xattrs) | |
442 | goto bad_lock; | |
443 | memset(xattrs, 0, numattr*sizeof(struct ceph_xattr *)); | |
444 | for (i = 0; i < numattr; i++) { | |
445 | xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr), | |
446 | GFP_NOFS); | |
447 | if (!xattrs[i]) | |
448 | goto bad_lock; | |
449 | } | |
450 | ||
be655596 | 451 | spin_lock(&ci->i_ceph_lock); |
355da1eb SW |
452 | if (ci->i_xattrs.version != xattr_version) { |
453 | /* lost a race, retry */ | |
454 | for (i = 0; i < numattr; i++) | |
455 | kfree(xattrs[i]); | |
456 | kfree(xattrs); | |
21ec6ffa | 457 | xattrs = NULL; |
355da1eb SW |
458 | goto start; |
459 | } | |
460 | err = -EIO; | |
461 | while (numattr--) { | |
462 | ceph_decode_32_safe(&p, end, len, bad); | |
463 | namelen = len; | |
464 | name = p; | |
465 | p += len; | |
466 | ceph_decode_32_safe(&p, end, len, bad); | |
467 | val = p; | |
468 | p += len; | |
469 | ||
470 | err = __set_xattr(ci, name, namelen, val, len, | |
471 | 0, 0, 0, &xattrs[numattr]); | |
472 | ||
473 | if (err < 0) | |
474 | goto bad; | |
475 | } | |
476 | kfree(xattrs); | |
477 | } | |
478 | ci->i_xattrs.index_version = ci->i_xattrs.version; | |
479 | ci->i_xattrs.dirty = false; | |
480 | ||
481 | return err; | |
482 | bad_lock: | |
be655596 | 483 | spin_lock(&ci->i_ceph_lock); |
355da1eb SW |
484 | bad: |
485 | if (xattrs) { | |
486 | for (i = 0; i < numattr; i++) | |
487 | kfree(xattrs[i]); | |
488 | kfree(xattrs); | |
489 | } | |
490 | ci->i_xattrs.names_size = 0; | |
491 | return err; | |
492 | } | |
493 | ||
494 | static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size, | |
495 | int val_size) | |
496 | { | |
497 | /* | |
498 | * 4 bytes for the length, and additional 4 bytes per each xattr name, | |
499 | * 4 bytes per each value | |
500 | */ | |
501 | int size = 4 + ci->i_xattrs.count*(4 + 4) + | |
502 | ci->i_xattrs.names_size + | |
503 | ci->i_xattrs.vals_size; | |
504 | dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n", | |
505 | ci->i_xattrs.count, ci->i_xattrs.names_size, | |
506 | ci->i_xattrs.vals_size); | |
507 | ||
508 | if (name_size) | |
509 | size += 4 + 4 + name_size + val_size; | |
510 | ||
511 | return size; | |
512 | } | |
513 | ||
514 | /* | |
515 | * If there are dirty xattrs, reencode xattrs into the prealloc_blob | |
516 | * and swap into place. | |
517 | */ | |
518 | void __ceph_build_xattrs_blob(struct ceph_inode_info *ci) | |
519 | { | |
520 | struct rb_node *p; | |
521 | struct ceph_inode_xattr *xattr = NULL; | |
522 | void *dest; | |
523 | ||
524 | dout("__build_xattrs_blob %p\n", &ci->vfs_inode); | |
525 | if (ci->i_xattrs.dirty) { | |
526 | int need = __get_required_blob_size(ci, 0, 0); | |
527 | ||
528 | BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len); | |
529 | ||
530 | p = rb_first(&ci->i_xattrs.index); | |
531 | dest = ci->i_xattrs.prealloc_blob->vec.iov_base; | |
532 | ||
533 | ceph_encode_32(&dest, ci->i_xattrs.count); | |
534 | while (p) { | |
535 | xattr = rb_entry(p, struct ceph_inode_xattr, node); | |
536 | ||
537 | ceph_encode_32(&dest, xattr->name_len); | |
538 | memcpy(dest, xattr->name, xattr->name_len); | |
539 | dest += xattr->name_len; | |
540 | ceph_encode_32(&dest, xattr->val_len); | |
541 | memcpy(dest, xattr->val, xattr->val_len); | |
542 | dest += xattr->val_len; | |
543 | ||
544 | p = rb_next(p); | |
545 | } | |
546 | ||
547 | /* adjust buffer len; it may be larger than we need */ | |
548 | ci->i_xattrs.prealloc_blob->vec.iov_len = | |
549 | dest - ci->i_xattrs.prealloc_blob->vec.iov_base; | |
550 | ||
b6c1d5b8 SW |
551 | if (ci->i_xattrs.blob) |
552 | ceph_buffer_put(ci->i_xattrs.blob); | |
355da1eb SW |
553 | ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob; |
554 | ci->i_xattrs.prealloc_blob = NULL; | |
555 | ci->i_xattrs.dirty = false; | |
4a625be4 | 556 | ci->i_xattrs.version++; |
355da1eb SW |
557 | } |
558 | } | |
559 | ||
560 | ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value, | |
561 | size_t size) | |
562 | { | |
563 | struct inode *inode = dentry->d_inode; | |
564 | struct ceph_inode_info *ci = ceph_inode(inode); | |
355da1eb SW |
565 | int err; |
566 | struct ceph_inode_xattr *xattr; | |
881a5fa2 | 567 | struct ceph_vxattr *vxattr = NULL; |
355da1eb SW |
568 | |
569 | if (!ceph_is_valid_xattr(name)) | |
570 | return -ENODATA; | |
571 | ||
572 | /* let's see if a virtual xattr was requested */ | |
06476a69 | 573 | vxattr = ceph_match_vxattr(inode, name); |
355da1eb | 574 | |
be655596 | 575 | spin_lock(&ci->i_ceph_lock); |
355da1eb SW |
576 | dout("getxattr %p ver=%lld index_ver=%lld\n", inode, |
577 | ci->i_xattrs.version, ci->i_xattrs.index_version); | |
578 | ||
579 | if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) && | |
580 | (ci->i_xattrs.index_version >= ci->i_xattrs.version)) { | |
581 | goto get_xattr; | |
582 | } else { | |
be655596 | 583 | spin_unlock(&ci->i_ceph_lock); |
355da1eb SW |
584 | /* get xattrs from mds (if we don't already have them) */ |
585 | err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR); | |
586 | if (err) | |
587 | return err; | |
588 | } | |
589 | ||
be655596 | 590 | spin_lock(&ci->i_ceph_lock); |
355da1eb SW |
591 | |
592 | if (vxattr && vxattr->readonly) { | |
593 | err = vxattr->getxattr_cb(ci, value, size); | |
594 | goto out; | |
595 | } | |
596 | ||
597 | err = __build_xattrs(inode); | |
598 | if (err < 0) | |
599 | goto out; | |
600 | ||
601 | get_xattr: | |
602 | err = -ENODATA; /* == ENOATTR */ | |
603 | xattr = __get_xattr(ci, name); | |
604 | if (!xattr) { | |
605 | if (vxattr) | |
606 | err = vxattr->getxattr_cb(ci, value, size); | |
607 | goto out; | |
608 | } | |
609 | ||
610 | err = -ERANGE; | |
611 | if (size && size < xattr->val_len) | |
612 | goto out; | |
613 | ||
614 | err = xattr->val_len; | |
615 | if (size == 0) | |
616 | goto out; | |
617 | ||
618 | memcpy(value, xattr->val, xattr->val_len); | |
619 | ||
620 | out: | |
be655596 | 621 | spin_unlock(&ci->i_ceph_lock); |
355da1eb SW |
622 | return err; |
623 | } | |
624 | ||
625 | ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size) | |
626 | { | |
627 | struct inode *inode = dentry->d_inode; | |
628 | struct ceph_inode_info *ci = ceph_inode(inode); | |
881a5fa2 | 629 | struct ceph_vxattr *vxattrs = ceph_inode_vxattrs(inode); |
355da1eb SW |
630 | u32 vir_namelen = 0; |
631 | u32 namelen; | |
632 | int err; | |
633 | u32 len; | |
634 | int i; | |
635 | ||
be655596 | 636 | spin_lock(&ci->i_ceph_lock); |
355da1eb SW |
637 | dout("listxattr %p ver=%lld index_ver=%lld\n", inode, |
638 | ci->i_xattrs.version, ci->i_xattrs.index_version); | |
639 | ||
640 | if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) && | |
bddfa3cc | 641 | (ci->i_xattrs.index_version >= ci->i_xattrs.version)) { |
355da1eb SW |
642 | goto list_xattr; |
643 | } else { | |
be655596 | 644 | spin_unlock(&ci->i_ceph_lock); |
355da1eb SW |
645 | err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR); |
646 | if (err) | |
647 | return err; | |
648 | } | |
649 | ||
be655596 | 650 | spin_lock(&ci->i_ceph_lock); |
355da1eb SW |
651 | |
652 | err = __build_xattrs(inode); | |
653 | if (err < 0) | |
654 | goto out; | |
655 | ||
656 | list_xattr: | |
3ce6cd12 AE |
657 | /* |
658 | * Start with virtual dir xattr names (if any) (including | |
659 | * terminating '\0' characters for each). | |
660 | */ | |
661 | vir_namelen = ceph_vxattrs_name_size(vxattrs); | |
662 | ||
355da1eb SW |
663 | /* adding 1 byte per each variable due to the null termination */ |
664 | namelen = vir_namelen + ci->i_xattrs.names_size + ci->i_xattrs.count; | |
665 | err = -ERANGE; | |
666 | if (size && namelen > size) | |
667 | goto out; | |
668 | ||
669 | err = namelen; | |
670 | if (size == 0) | |
671 | goto out; | |
672 | ||
673 | names = __copy_xattr_names(ci, names); | |
674 | ||
675 | /* virtual xattr names, too */ | |
676 | if (vxattrs) | |
677 | for (i = 0; vxattrs[i].name; i++) { | |
678 | len = sprintf(names, "%s", vxattrs[i].name); | |
679 | names += len + 1; | |
680 | } | |
681 | ||
682 | out: | |
be655596 | 683 | spin_unlock(&ci->i_ceph_lock); |
355da1eb SW |
684 | return err; |
685 | } | |
686 | ||
687 | static int ceph_sync_setxattr(struct dentry *dentry, const char *name, | |
688 | const char *value, size_t size, int flags) | |
689 | { | |
3d14c5d2 | 690 | struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); |
355da1eb SW |
691 | struct inode *inode = dentry->d_inode; |
692 | struct ceph_inode_info *ci = ceph_inode(inode); | |
5f21c96d | 693 | struct inode *parent_inode; |
355da1eb | 694 | struct ceph_mds_request *req; |
3d14c5d2 | 695 | struct ceph_mds_client *mdsc = fsc->mdsc; |
355da1eb SW |
696 | int err; |
697 | int i, nr_pages; | |
698 | struct page **pages = NULL; | |
699 | void *kaddr; | |
700 | ||
701 | /* copy value into some pages */ | |
702 | nr_pages = calc_pages_for(0, size); | |
703 | if (nr_pages) { | |
704 | pages = kmalloc(sizeof(pages[0])*nr_pages, GFP_NOFS); | |
705 | if (!pages) | |
706 | return -ENOMEM; | |
707 | err = -ENOMEM; | |
708 | for (i = 0; i < nr_pages; i++) { | |
31459fe4 | 709 | pages[i] = __page_cache_alloc(GFP_NOFS); |
355da1eb SW |
710 | if (!pages[i]) { |
711 | nr_pages = i; | |
712 | goto out; | |
713 | } | |
714 | kaddr = kmap(pages[i]); | |
715 | memcpy(kaddr, value + i*PAGE_CACHE_SIZE, | |
716 | min(PAGE_CACHE_SIZE, size-i*PAGE_CACHE_SIZE)); | |
717 | } | |
718 | } | |
719 | ||
720 | dout("setxattr value=%.*s\n", (int)size, value); | |
721 | ||
722 | /* do request */ | |
723 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETXATTR, | |
724 | USE_AUTH_MDS); | |
60d87733 JL |
725 | if (IS_ERR(req)) { |
726 | err = PTR_ERR(req); | |
727 | goto out; | |
728 | } | |
70b666c3 SW |
729 | req->r_inode = inode; |
730 | ihold(inode); | |
355da1eb SW |
731 | req->r_inode_drop = CEPH_CAP_XATTR_SHARED; |
732 | req->r_num_caps = 1; | |
733 | req->r_args.setxattr.flags = cpu_to_le32(flags); | |
734 | req->r_path2 = kstrdup(name, GFP_NOFS); | |
735 | ||
736 | req->r_pages = pages; | |
737 | req->r_num_pages = nr_pages; | |
738 | req->r_data_len = size; | |
739 | ||
740 | dout("xattr.ver (before): %lld\n", ci->i_xattrs.version); | |
5f21c96d | 741 | parent_inode = ceph_get_dentry_parent_inode(dentry); |
355da1eb | 742 | err = ceph_mdsc_do_request(mdsc, parent_inode, req); |
5f21c96d | 743 | iput(parent_inode); |
355da1eb SW |
744 | ceph_mdsc_put_request(req); |
745 | dout("xattr.ver (after): %lld\n", ci->i_xattrs.version); | |
746 | ||
747 | out: | |
748 | if (pages) { | |
749 | for (i = 0; i < nr_pages; i++) | |
750 | __free_page(pages[i]); | |
751 | kfree(pages); | |
752 | } | |
753 | return err; | |
754 | } | |
755 | ||
756 | int ceph_setxattr(struct dentry *dentry, const char *name, | |
757 | const void *value, size_t size, int flags) | |
758 | { | |
759 | struct inode *inode = dentry->d_inode; | |
881a5fa2 | 760 | struct ceph_vxattr *vxattr; |
355da1eb | 761 | struct ceph_inode_info *ci = ceph_inode(inode); |
18fa8b3f | 762 | int issued; |
355da1eb | 763 | int err; |
18fa8b3f | 764 | int dirty; |
355da1eb SW |
765 | int name_len = strlen(name); |
766 | int val_len = size; | |
767 | char *newname = NULL; | |
768 | char *newval = NULL; | |
769 | struct ceph_inode_xattr *xattr = NULL; | |
355da1eb SW |
770 | int required_blob_size; |
771 | ||
772 | if (ceph_snap(inode) != CEPH_NOSNAP) | |
773 | return -EROFS; | |
774 | ||
775 | if (!ceph_is_valid_xattr(name)) | |
776 | return -EOPNOTSUPP; | |
777 | ||
06476a69 AE |
778 | vxattr = ceph_match_vxattr(inode, name); |
779 | if (vxattr && vxattr->readonly) | |
780 | return -EOPNOTSUPP; | |
355da1eb | 781 | |
3adf654d SW |
782 | /* pass any unhandled ceph.* xattrs through to the MDS */ |
783 | if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN)) | |
784 | goto do_sync_unlocked; | |
785 | ||
355da1eb SW |
786 | /* preallocate memory for xattr name, value, index node */ |
787 | err = -ENOMEM; | |
61413c2f | 788 | newname = kmemdup(name, name_len + 1, GFP_NOFS); |
355da1eb SW |
789 | if (!newname) |
790 | goto out; | |
355da1eb SW |
791 | |
792 | if (val_len) { | |
b829c195 | 793 | newval = kmemdup(value, val_len, GFP_NOFS); |
355da1eb SW |
794 | if (!newval) |
795 | goto out; | |
355da1eb SW |
796 | } |
797 | ||
798 | xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS); | |
799 | if (!xattr) | |
800 | goto out; | |
801 | ||
be655596 | 802 | spin_lock(&ci->i_ceph_lock); |
355da1eb SW |
803 | retry: |
804 | issued = __ceph_caps_issued(ci, NULL); | |
18fa8b3f | 805 | dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued)); |
355da1eb SW |
806 | if (!(issued & CEPH_CAP_XATTR_EXCL)) |
807 | goto do_sync; | |
808 | __build_xattrs(inode); | |
809 | ||
810 | required_blob_size = __get_required_blob_size(ci, name_len, val_len); | |
811 | ||
812 | if (!ci->i_xattrs.prealloc_blob || | |
813 | required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) { | |
18fa8b3f | 814 | struct ceph_buffer *blob; |
355da1eb | 815 | |
be655596 | 816 | spin_unlock(&ci->i_ceph_lock); |
355da1eb | 817 | dout(" preaallocating new blob size=%d\n", required_blob_size); |
b6c1d5b8 | 818 | blob = ceph_buffer_new(required_blob_size, GFP_NOFS); |
355da1eb SW |
819 | if (!blob) |
820 | goto out; | |
be655596 | 821 | spin_lock(&ci->i_ceph_lock); |
b6c1d5b8 SW |
822 | if (ci->i_xattrs.prealloc_blob) |
823 | ceph_buffer_put(ci->i_xattrs.prealloc_blob); | |
355da1eb SW |
824 | ci->i_xattrs.prealloc_blob = blob; |
825 | goto retry; | |
826 | } | |
827 | ||
355da1eb SW |
828 | err = __set_xattr(ci, newname, name_len, newval, |
829 | val_len, 1, 1, 1, &xattr); | |
18fa8b3f | 830 | |
fca65b4a | 831 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL); |
355da1eb SW |
832 | ci->i_xattrs.dirty = true; |
833 | inode->i_ctime = CURRENT_TIME; | |
18fa8b3f | 834 | |
be655596 | 835 | spin_unlock(&ci->i_ceph_lock); |
fca65b4a SW |
836 | if (dirty) |
837 | __mark_inode_dirty(inode, dirty); | |
355da1eb SW |
838 | return err; |
839 | ||
840 | do_sync: | |
be655596 | 841 | spin_unlock(&ci->i_ceph_lock); |
3adf654d | 842 | do_sync_unlocked: |
355da1eb SW |
843 | err = ceph_sync_setxattr(dentry, name, value, size, flags); |
844 | out: | |
845 | kfree(newname); | |
846 | kfree(newval); | |
847 | kfree(xattr); | |
848 | return err; | |
849 | } | |
850 | ||
851 | static int ceph_send_removexattr(struct dentry *dentry, const char *name) | |
852 | { | |
3d14c5d2 YS |
853 | struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); |
854 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
355da1eb | 855 | struct inode *inode = dentry->d_inode; |
5f21c96d | 856 | struct inode *parent_inode; |
355da1eb SW |
857 | struct ceph_mds_request *req; |
858 | int err; | |
859 | ||
860 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RMXATTR, | |
861 | USE_AUTH_MDS); | |
862 | if (IS_ERR(req)) | |
863 | return PTR_ERR(req); | |
70b666c3 SW |
864 | req->r_inode = inode; |
865 | ihold(inode); | |
355da1eb SW |
866 | req->r_inode_drop = CEPH_CAP_XATTR_SHARED; |
867 | req->r_num_caps = 1; | |
868 | req->r_path2 = kstrdup(name, GFP_NOFS); | |
869 | ||
5f21c96d | 870 | parent_inode = ceph_get_dentry_parent_inode(dentry); |
355da1eb | 871 | err = ceph_mdsc_do_request(mdsc, parent_inode, req); |
5f21c96d | 872 | iput(parent_inode); |
355da1eb SW |
873 | ceph_mdsc_put_request(req); |
874 | return err; | |
875 | } | |
876 | ||
877 | int ceph_removexattr(struct dentry *dentry, const char *name) | |
878 | { | |
879 | struct inode *inode = dentry->d_inode; | |
881a5fa2 | 880 | struct ceph_vxattr *vxattr; |
355da1eb | 881 | struct ceph_inode_info *ci = ceph_inode(inode); |
355da1eb SW |
882 | int issued; |
883 | int err; | |
83eb26af | 884 | int required_blob_size; |
fca65b4a | 885 | int dirty; |
355da1eb SW |
886 | |
887 | if (ceph_snap(inode) != CEPH_NOSNAP) | |
888 | return -EROFS; | |
889 | ||
890 | if (!ceph_is_valid_xattr(name)) | |
891 | return -EOPNOTSUPP; | |
892 | ||
06476a69 AE |
893 | vxattr = ceph_match_vxattr(inode, name); |
894 | if (vxattr && vxattr->readonly) | |
895 | return -EOPNOTSUPP; | |
355da1eb | 896 | |
d421acb1 SW |
897 | /* pass any unhandled ceph.* xattrs through to the MDS */ |
898 | if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN)) | |
899 | goto do_sync_unlocked; | |
900 | ||
83eb26af | 901 | err = -ENOMEM; |
be655596 | 902 | spin_lock(&ci->i_ceph_lock); |
83eb26af | 903 | retry: |
355da1eb SW |
904 | issued = __ceph_caps_issued(ci, NULL); |
905 | dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued)); | |
906 | ||
907 | if (!(issued & CEPH_CAP_XATTR_EXCL)) | |
908 | goto do_sync; | |
18fa8b3f | 909 | __build_xattrs(inode); |
355da1eb | 910 | |
83eb26af AE |
911 | required_blob_size = __get_required_blob_size(ci, 0, 0); |
912 | ||
913 | if (!ci->i_xattrs.prealloc_blob || | |
914 | required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) { | |
915 | struct ceph_buffer *blob; | |
916 | ||
917 | spin_unlock(&ci->i_ceph_lock); | |
918 | dout(" preaallocating new blob size=%d\n", required_blob_size); | |
919 | blob = ceph_buffer_new(required_blob_size, GFP_NOFS); | |
920 | if (!blob) | |
921 | goto out; | |
922 | spin_lock(&ci->i_ceph_lock); | |
923 | if (ci->i_xattrs.prealloc_blob) | |
924 | ceph_buffer_put(ci->i_xattrs.prealloc_blob); | |
925 | ci->i_xattrs.prealloc_blob = blob; | |
926 | goto retry; | |
927 | } | |
928 | ||
355da1eb | 929 | err = __remove_xattr_by_name(ceph_inode(inode), name); |
18fa8b3f | 930 | |
fca65b4a | 931 | dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL); |
355da1eb SW |
932 | ci->i_xattrs.dirty = true; |
933 | inode->i_ctime = CURRENT_TIME; | |
be655596 | 934 | spin_unlock(&ci->i_ceph_lock); |
fca65b4a SW |
935 | if (dirty) |
936 | __mark_inode_dirty(inode, dirty); | |
355da1eb SW |
937 | return err; |
938 | do_sync: | |
be655596 | 939 | spin_unlock(&ci->i_ceph_lock); |
d421acb1 | 940 | do_sync_unlocked: |
355da1eb | 941 | err = ceph_send_removexattr(dentry, name); |
83eb26af | 942 | out: |
355da1eb SW |
943 | return err; |
944 | } | |
945 |