~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/ceph/xattr.c

Version: ~ [ linux-5.5-rc1 ] ~ [ linux-5.4.2 ] ~ [ linux-5.3.15 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.88 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.158 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.206 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.206 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.78 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp