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

Version: ~ [ linux-5.7-rc7 ] ~ [ linux-5.6.14 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.42 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.124 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.181 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.224 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.224 ] ~ [ 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-3.16.84 ] ~ [ 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-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 
 75         dout("ceph_vxattrcb_layout %p\n", &ci->vfs_inode);
 76         down_read(&osdc->map_sem);
 77         pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
 78         if (pool_name)
 79                 ret = snprintf(val, size,
 80                 "stripe_unit=%lld stripe_count=%lld object_size=%lld pool=%s",
 81                 (unsigned long long)ceph_file_layout_su(ci->i_layout),
 82                 (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
 83                 (unsigned long long)ceph_file_layout_object_size(ci->i_layout),
 84                 pool_name);
 85         else
 86                 ret = snprintf(val, size,
 87                 "stripe_unit=%lld stripe_count=%lld object_size=%lld pool=%lld",
 88                 (unsigned long long)ceph_file_layout_su(ci->i_layout),
 89                 (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
 90                 (unsigned long long)ceph_file_layout_object_size(ci->i_layout),
 91                 (unsigned long long)pool);
 92 
 93         up_read(&osdc->map_sem);
 94         return ret;
 95 }
 96 
 97 static size_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci,
 98                                                char *val, size_t size)
 99 {
100         return snprintf(val, size, "%lld",
101                         (unsigned long long)ceph_file_layout_su(ci->i_layout));
102 }
103 
104 static size_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci,
105                                                 char *val, size_t size)
106 {
107         return snprintf(val, size, "%lld",
108                (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout));
109 }
110 
111 static size_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci,
112                                                char *val, size_t size)
113 {
114         return snprintf(val, size, "%lld",
115                (unsigned long long)ceph_file_layout_object_size(ci->i_layout));
116 }
117 
118 static size_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci,
119                                         char *val, size_t size)
120 {
121         int ret;
122         struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
123         struct ceph_osd_client *osdc = &fsc->client->osdc;
124         s64 pool = ceph_file_layout_pg_pool(ci->i_layout);
125         const char *pool_name;
126 
127         down_read(&osdc->map_sem);
128         pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
129         if (pool_name)
130                 ret = snprintf(val, size, "%s", pool_name);
131         else
132                 ret = snprintf(val, size, "%lld", (unsigned long long)pool);
133         up_read(&osdc->map_sem);
134         return ret;
135 }
136 
137 /* directories */
138 
139 static size_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val,
140                                         size_t size)
141 {
142         return snprintf(val, size, "%lld", ci->i_files + ci->i_subdirs);
143 }
144 
145 static size_t ceph_vxattrcb_dir_files(struct ceph_inode_info *ci, char *val,
146                                       size_t size)
147 {
148         return snprintf(val, size, "%lld", ci->i_files);
149 }
150 
151 static size_t ceph_vxattrcb_dir_subdirs(struct ceph_inode_info *ci, char *val,
152                                         size_t size)
153 {
154         return snprintf(val, size, "%lld", ci->i_subdirs);
155 }
156 
157 static size_t ceph_vxattrcb_dir_rentries(struct ceph_inode_info *ci, char *val,
158                                          size_t size)
159 {
160         return snprintf(val, size, "%lld", ci->i_rfiles + ci->i_rsubdirs);
161 }
162 
163 static size_t ceph_vxattrcb_dir_rfiles(struct ceph_inode_info *ci, char *val,
164                                        size_t size)
165 {
166         return snprintf(val, size, "%lld", ci->i_rfiles);
167 }
168 
169 static size_t ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info *ci, char *val,
170                                          size_t size)
171 {
172         return snprintf(val, size, "%lld", ci->i_rsubdirs);
173 }
174 
175 static size_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val,
176                                        size_t size)
177 {
178         return snprintf(val, size, "%lld", ci->i_rbytes);
179 }
180 
181 static size_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val,
182                                        size_t size)
183 {
184         return snprintf(val, size, "%ld.09%ld", (long)ci->i_rctime.tv_sec,
185                         (long)ci->i_rctime.tv_nsec);
186 }
187 
188 
189 #define CEPH_XATTR_NAME(_type, _name)   XATTR_CEPH_PREFIX #_type "." #_name
190 #define CEPH_XATTR_NAME2(_type, _name, _name2)  \
191         XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
192 
193 #define XATTR_NAME_CEPH(_type, _name)                                   \
194         {                                                               \
195                 .name = CEPH_XATTR_NAME(_type, _name),                  \
196                 .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \
197                 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
198                 .readonly = true,                               \
199                 .hidden = false,                                \
200                 .exists_cb = NULL,                      \
201         }
202 #define XATTR_LAYOUT_FIELD(_type, _name, _field)                        \
203         {                                                               \
204                 .name = CEPH_XATTR_NAME2(_type, _name, _field), \
205                 .name_size = sizeof (CEPH_XATTR_NAME2(_type, _name, _field)), \
206                 .getxattr_cb = ceph_vxattrcb_ ## _name ## _ ## _field, \
207                 .readonly = false,                              \
208                 .hidden = true,                 \
209                 .exists_cb = ceph_vxattrcb_layout_exists,       \
210         }
211 
212 static struct ceph_vxattr ceph_dir_vxattrs[] = {
213         {
214                 .name = "ceph.dir.layout",
215                 .name_size = sizeof("ceph.dir.layout"),
216                 .getxattr_cb = ceph_vxattrcb_layout,
217                 .readonly = false,
218                 .hidden = false,
219                 .exists_cb = ceph_vxattrcb_layout_exists,
220         },
221         XATTR_LAYOUT_FIELD(dir, layout, stripe_unit),
222         XATTR_LAYOUT_FIELD(dir, layout, stripe_count),
223         XATTR_LAYOUT_FIELD(dir, layout, object_size),
224         XATTR_LAYOUT_FIELD(dir, layout, pool),
225         XATTR_NAME_CEPH(dir, entries),
226         XATTR_NAME_CEPH(dir, files),
227         XATTR_NAME_CEPH(dir, subdirs),
228         XATTR_NAME_CEPH(dir, rentries),
229         XATTR_NAME_CEPH(dir, rfiles),
230         XATTR_NAME_CEPH(dir, rsubdirs),
231         XATTR_NAME_CEPH(dir, rbytes),
232         XATTR_NAME_CEPH(dir, rctime),
233         { .name = NULL, 0 }     /* Required table terminator */
234 };
235 static size_t ceph_dir_vxattrs_name_size;       /* total size of all names */
236 
237 /* files */
238 
239 static struct ceph_vxattr ceph_file_vxattrs[] = {
240         {
241                 .name = "ceph.file.layout",
242                 .name_size = sizeof("ceph.file.layout"),
243                 .getxattr_cb = ceph_vxattrcb_layout,
244                 .readonly = false,
245                 .hidden = false,
246                 .exists_cb = ceph_vxattrcb_layout_exists,
247         },
248         XATTR_LAYOUT_FIELD(file, layout, stripe_unit),
249         XATTR_LAYOUT_FIELD(file, layout, stripe_count),
250         XATTR_LAYOUT_FIELD(file, layout, object_size),
251         XATTR_LAYOUT_FIELD(file, layout, pool),
252         { .name = NULL, 0 }     /* Required table terminator */
253 };
254 static size_t ceph_file_vxattrs_name_size;      /* total size of all names */
255 
256 static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode)
257 {
258         if (S_ISDIR(inode->i_mode))
259                 return ceph_dir_vxattrs;
260         else if (S_ISREG(inode->i_mode))
261                 return ceph_file_vxattrs;
262         return NULL;
263 }
264 
265 static size_t ceph_vxattrs_name_size(struct ceph_vxattr *vxattrs)
266 {
267         if (vxattrs == ceph_dir_vxattrs)
268                 return ceph_dir_vxattrs_name_size;
269         if (vxattrs == ceph_file_vxattrs)
270                 return ceph_file_vxattrs_name_size;
271         BUG();
272 
273         return 0;
274 }
275 
276 /*
277  * Compute the aggregate size (including terminating '\0') of all
278  * virtual extended attribute names in the given vxattr table.
279  */
280 static size_t __init vxattrs_name_size(struct ceph_vxattr *vxattrs)
281 {
282         struct ceph_vxattr *vxattr;
283         size_t size = 0;
284 
285         for (vxattr = vxattrs; vxattr->name; vxattr++)
286                 if (!vxattr->hidden)
287                         size += vxattr->name_size;
288 
289         return size;
290 }
291 
292 /* Routines called at initialization and exit time */
293 
294 void __init ceph_xattr_init(void)
295 {
296         ceph_dir_vxattrs_name_size = vxattrs_name_size(ceph_dir_vxattrs);
297         ceph_file_vxattrs_name_size = vxattrs_name_size(ceph_file_vxattrs);
298 }
299 
300 void ceph_xattr_exit(void)
301 {
302         ceph_dir_vxattrs_name_size = 0;
303         ceph_file_vxattrs_name_size = 0;
304 }
305 
306 static struct ceph_vxattr *ceph_match_vxattr(struct inode *inode,
307                                                 const char *name)
308 {
309         struct ceph_vxattr *vxattr = ceph_inode_vxattrs(inode);
310 
311         if (vxattr) {
312                 while (vxattr->name) {
313                         if (!strcmp(vxattr->name, name))
314                                 return vxattr;
315                         vxattr++;
316                 }
317         }
318 
319         return NULL;
320 }
321 
322 static int __set_xattr(struct ceph_inode_info *ci,
323                            const char *name, int name_len,
324                            const char *val, int val_len,
325                            int flags, int update_xattr,
326                            struct ceph_inode_xattr **newxattr)
327 {
328         struct rb_node **p;
329         struct rb_node *parent = NULL;
330         struct ceph_inode_xattr *xattr = NULL;
331         int c;
332         int new = 0;
333 
334         p = &ci->i_xattrs.index.rb_node;
335         while (*p) {
336                 parent = *p;
337                 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
338                 c = strncmp(name, xattr->name, min(name_len, xattr->name_len));
339                 if (c < 0)
340                         p = &(*p)->rb_left;
341                 else if (c > 0)
342                         p = &(*p)->rb_right;
343                 else {
344                         if (name_len == xattr->name_len)
345                                 break;
346                         else if (name_len < xattr->name_len)
347                                 p = &(*p)->rb_left;
348                         else
349                                 p = &(*p)->rb_right;
350                 }
351                 xattr = NULL;
352         }
353 
354         if (update_xattr) {
355                 int err = 0;
356                 if (xattr && (flags & XATTR_CREATE))
357                         err = -EEXIST;
358                 else if (!xattr && (flags & XATTR_REPLACE))
359                         err = -ENODATA;
360                 if (err) {
361                         kfree(name);
362                         kfree(val);
363                         return err;
364                 }
365                 if (update_xattr < 0) {
366                         if (xattr)
367                                 __remove_xattr(ci, xattr);
368                         kfree(name);
369                         return 0;
370                 }
371         }
372 
373         if (!xattr) {
374                 new = 1;
375                 xattr = *newxattr;
376                 xattr->name = name;
377                 xattr->name_len = name_len;
378                 xattr->should_free_name = update_xattr;
379 
380                 ci->i_xattrs.count++;
381                 dout("__set_xattr count=%d\n", ci->i_xattrs.count);
382         } else {
383                 kfree(*newxattr);
384                 *newxattr = NULL;
385                 if (xattr->should_free_val)
386                         kfree((void *)xattr->val);
387 
388                 if (update_xattr) {
389                         kfree((void *)name);
390                         name = xattr->name;
391                 }
392                 ci->i_xattrs.names_size -= xattr->name_len;
393                 ci->i_xattrs.vals_size -= xattr->val_len;
394         }
395         ci->i_xattrs.names_size += name_len;
396         ci->i_xattrs.vals_size += val_len;
397         if (val)
398                 xattr->val = val;
399         else
400                 xattr->val = "";
401 
402         xattr->val_len = val_len;
403         xattr->dirty = update_xattr;
404         xattr->should_free_val = (val && update_xattr);
405 
406         if (new) {
407                 rb_link_node(&xattr->node, parent, p);
408                 rb_insert_color(&xattr->node, &ci->i_xattrs.index);
409                 dout("__set_xattr_val p=%p\n", p);
410         }
411 
412         dout("__set_xattr_val added %llx.%llx xattr %p %s=%.*s\n",
413              ceph_vinop(&ci->vfs_inode), xattr, name, val_len, val);
414 
415         return 0;
416 }
417 
418 static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci,
419                            const char *name)
420 {
421         struct rb_node **p;
422         struct rb_node *parent = NULL;
423         struct ceph_inode_xattr *xattr = NULL;
424         int name_len = strlen(name);
425         int c;
426 
427         p = &ci->i_xattrs.index.rb_node;
428         while (*p) {
429                 parent = *p;
430                 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
431                 c = strncmp(name, xattr->name, xattr->name_len);
432                 if (c == 0 && name_len > xattr->name_len)
433                         c = 1;
434                 if (c < 0)
435                         p = &(*p)->rb_left;
436                 else if (c > 0)
437                         p = &(*p)->rb_right;
438                 else {
439                         dout("__get_xattr %s: found %.*s\n", name,
440                              xattr->val_len, xattr->val);
441                         return xattr;
442                 }
443         }
444 
445         dout("__get_xattr %s: not found\n", name);
446 
447         return NULL;
448 }
449 
450 static void __free_xattr(struct ceph_inode_xattr *xattr)
451 {
452         BUG_ON(!xattr);
453 
454         if (xattr->should_free_name)
455                 kfree((void *)xattr->name);
456         if (xattr->should_free_val)
457                 kfree((void *)xattr->val);
458 
459         kfree(xattr);
460 }
461 
462 static int __remove_xattr(struct ceph_inode_info *ci,
463                           struct ceph_inode_xattr *xattr)
464 {
465         if (!xattr)
466                 return -ENODATA;
467 
468         rb_erase(&xattr->node, &ci->i_xattrs.index);
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         ci->i_xattrs.names_size -= xattr->name_len;
476         ci->i_xattrs.vals_size -= xattr->val_len;
477         ci->i_xattrs.count--;
478         kfree(xattr);
479 
480         return 0;
481 }
482 
483 static int __remove_xattr_by_name(struct ceph_inode_info *ci,
484                            const char *name)
485 {
486         struct rb_node **p;
487         struct ceph_inode_xattr *xattr;
488         int err;
489 
490         p = &ci->i_xattrs.index.rb_node;
491         xattr = __get_xattr(ci, name);
492         err = __remove_xattr(ci, xattr);
493         return err;
494 }
495 
496 static char *__copy_xattr_names(struct ceph_inode_info *ci,
497                                 char *dest)
498 {
499         struct rb_node *p;
500         struct ceph_inode_xattr *xattr = NULL;
501 
502         p = rb_first(&ci->i_xattrs.index);
503         dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count);
504 
505         while (p) {
506                 xattr = rb_entry(p, struct ceph_inode_xattr, node);
507                 memcpy(dest, xattr->name, xattr->name_len);
508                 dest[xattr->name_len] = '\0';
509 
510                 dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name,
511                      xattr->name_len, ci->i_xattrs.names_size);
512 
513                 dest += xattr->name_len + 1;
514                 p = rb_next(p);
515         }
516 
517         return dest;
518 }
519 
520 void __ceph_destroy_xattrs(struct ceph_inode_info *ci)
521 {
522         struct rb_node *p, *tmp;
523         struct ceph_inode_xattr *xattr = NULL;
524 
525         p = rb_first(&ci->i_xattrs.index);
526 
527         dout("__ceph_destroy_xattrs p=%p\n", p);
528 
529         while (p) {
530                 xattr = rb_entry(p, struct ceph_inode_xattr, node);
531                 tmp = p;
532                 p = rb_next(tmp);
533                 dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p,
534                      xattr->name_len, xattr->name);
535                 rb_erase(tmp, &ci->i_xattrs.index);
536 
537                 __free_xattr(xattr);
538         }
539 
540         ci->i_xattrs.names_size = 0;
541         ci->i_xattrs.vals_size = 0;
542         ci->i_xattrs.index_version = 0;
543         ci->i_xattrs.count = 0;
544         ci->i_xattrs.index = RB_ROOT;
545 }
546 
547 static int __build_xattrs(struct inode *inode)
548         __releases(ci->i_ceph_lock)
549         __acquires(ci->i_ceph_lock)
550 {
551         u32 namelen;
552         u32 numattr = 0;
553         void *p, *end;
554         u32 len;
555         const char *name, *val;
556         struct ceph_inode_info *ci = ceph_inode(inode);
557         int xattr_version;
558         struct ceph_inode_xattr **xattrs = NULL;
559         int err = 0;
560         int i;
561 
562         dout("__build_xattrs() len=%d\n",
563              ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0);
564 
565         if (ci->i_xattrs.index_version >= ci->i_xattrs.version)
566                 return 0; /* already built */
567 
568         __ceph_destroy_xattrs(ci);
569 
570 start:
571         /* updated internal xattr rb tree */
572         if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) {
573                 p = ci->i_xattrs.blob->vec.iov_base;
574                 end = p + ci->i_xattrs.blob->vec.iov_len;
575                 ceph_decode_32_safe(&p, end, numattr, bad);
576                 xattr_version = ci->i_xattrs.version;
577                 spin_unlock(&ci->i_ceph_lock);
578 
579                 xattrs = kcalloc(numattr, sizeof(struct ceph_xattr *),
580                                  GFP_NOFS);
581                 err = -ENOMEM;
582                 if (!xattrs)
583                         goto bad_lock;
584                 memset(xattrs, 0, numattr*sizeof(struct ceph_xattr *));
585                 for (i = 0; i < numattr; i++) {
586                         xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr),
587                                             GFP_NOFS);
588                         if (!xattrs[i])
589                                 goto bad_lock;
590                 }
591 
592                 spin_lock(&ci->i_ceph_lock);
593                 if (ci->i_xattrs.version != xattr_version) {
594                         /* lost a race, retry */
595                         for (i = 0; i < numattr; i++)
596                                 kfree(xattrs[i]);
597                         kfree(xattrs);
598                         xattrs = NULL;
599                         goto start;
600                 }
601                 err = -EIO;
602                 while (numattr--) {
603                         ceph_decode_32_safe(&p, end, len, bad);
604                         namelen = len;
605                         name = p;
606                         p += len;
607                         ceph_decode_32_safe(&p, end, len, bad);
608                         val = p;
609                         p += len;
610 
611                         err = __set_xattr(ci, name, namelen, val, len,
612                                           0, 0, &xattrs[numattr]);
613 
614                         if (err < 0)
615                                 goto bad;
616                 }
617                 kfree(xattrs);
618         }
619         ci->i_xattrs.index_version = ci->i_xattrs.version;
620         ci->i_xattrs.dirty = false;
621 
622         return err;
623 bad_lock:
624         spin_lock(&ci->i_ceph_lock);
625 bad:
626         if (xattrs) {
627                 for (i = 0; i < numattr; i++)
628                         kfree(xattrs[i]);
629                 kfree(xattrs);
630         }
631         ci->i_xattrs.names_size = 0;
632         return err;
633 }
634 
635 static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size,
636                                     int val_size)
637 {
638         /*
639          * 4 bytes for the length, and additional 4 bytes per each xattr name,
640          * 4 bytes per each value
641          */
642         int size = 4 + ci->i_xattrs.count*(4 + 4) +
643                              ci->i_xattrs.names_size +
644                              ci->i_xattrs.vals_size;
645         dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n",
646              ci->i_xattrs.count, ci->i_xattrs.names_size,
647              ci->i_xattrs.vals_size);
648 
649         if (name_size)
650                 size += 4 + 4 + name_size + val_size;
651 
652         return size;
653 }
654 
655 /*
656  * If there are dirty xattrs, reencode xattrs into the prealloc_blob
657  * and swap into place.
658  */
659 void __ceph_build_xattrs_blob(struct ceph_inode_info *ci)
660 {
661         struct rb_node *p;
662         struct ceph_inode_xattr *xattr = NULL;
663         void *dest;
664 
665         dout("__build_xattrs_blob %p\n", &ci->vfs_inode);
666         if (ci->i_xattrs.dirty) {
667                 int need = __get_required_blob_size(ci, 0, 0);
668 
669                 BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len);
670 
671                 p = rb_first(&ci->i_xattrs.index);
672                 dest = ci->i_xattrs.prealloc_blob->vec.iov_base;
673 
674                 ceph_encode_32(&dest, ci->i_xattrs.count);
675                 while (p) {
676                         xattr = rb_entry(p, struct ceph_inode_xattr, node);
677 
678                         ceph_encode_32(&dest, xattr->name_len);
679                         memcpy(dest, xattr->name, xattr->name_len);
680                         dest += xattr->name_len;
681                         ceph_encode_32(&dest, xattr->val_len);
682                         memcpy(dest, xattr->val, xattr->val_len);
683                         dest += xattr->val_len;
684 
685                         p = rb_next(p);
686                 }
687 
688                 /* adjust buffer len; it may be larger than we need */
689                 ci->i_xattrs.prealloc_blob->vec.iov_len =
690                         dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
691 
692                 if (ci->i_xattrs.blob)
693                         ceph_buffer_put(ci->i_xattrs.blob);
694                 ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
695                 ci->i_xattrs.prealloc_blob = NULL;
696                 ci->i_xattrs.dirty = false;
697                 ci->i_xattrs.version++;
698         }
699 }
700 
701 ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
702                       size_t size)
703 {
704         struct ceph_inode_info *ci = ceph_inode(inode);
705         int err;
706         struct ceph_inode_xattr *xattr;
707         struct ceph_vxattr *vxattr = NULL;
708 
709         if (!ceph_is_valid_xattr(name))
710                 return -ENODATA;
711 
712         /* let's see if a virtual xattr was requested */
713         vxattr = ceph_match_vxattr(inode, name);
714         if (vxattr && !(vxattr->exists_cb && !vxattr->exists_cb(ci))) {
715                 err = vxattr->getxattr_cb(ci, value, size);
716                 return err;
717         }
718 
719         spin_lock(&ci->i_ceph_lock);
720         dout("getxattr %p ver=%lld index_ver=%lld\n", inode,
721              ci->i_xattrs.version, ci->i_xattrs.index_version);
722 
723         if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
724             (ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
725                 goto get_xattr;
726         } else {
727                 spin_unlock(&ci->i_ceph_lock);
728                 /* get xattrs from mds (if we don't already have them) */
729                 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
730                 if (err)
731                         return err;
732         }
733 
734         spin_lock(&ci->i_ceph_lock);
735 
736         err = __build_xattrs(inode);
737         if (err < 0)
738                 goto out;
739 
740 get_xattr:
741         err = -ENODATA;  /* == ENOATTR */
742         xattr = __get_xattr(ci, name);
743         if (!xattr)
744                 goto out;
745 
746         err = -ERANGE;
747         if (size && size < xattr->val_len)
748                 goto out;
749 
750         err = xattr->val_len;
751         if (size == 0)
752                 goto out;
753 
754         memcpy(value, xattr->val, xattr->val_len);
755 
756 out:
757         spin_unlock(&ci->i_ceph_lock);
758         return err;
759 }
760 
761 ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
762                       size_t size)
763 {
764         if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
765                 return generic_getxattr(dentry, name, value, size);
766 
767         return __ceph_getxattr(dentry->d_inode, name, value, size);
768 }
769 
770 ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
771 {
772         struct inode *inode = dentry->d_inode;
773         struct ceph_inode_info *ci = ceph_inode(inode);
774         struct ceph_vxattr *vxattrs = ceph_inode_vxattrs(inode);
775         u32 vir_namelen = 0;
776         u32 namelen;
777         int err;
778         u32 len;
779         int i;
780 
781         spin_lock(&ci->i_ceph_lock);
782         dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
783              ci->i_xattrs.version, ci->i_xattrs.index_version);
784 
785         if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
786             (ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
787                 goto list_xattr;
788         } else {
789                 spin_unlock(&ci->i_ceph_lock);
790                 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
791                 if (err)
792                         return err;
793         }
794 
795         spin_lock(&ci->i_ceph_lock);
796 
797         err = __build_xattrs(inode);
798         if (err < 0)
799                 goto out;
800 
801 list_xattr:
802         /*
803          * Start with virtual dir xattr names (if any) (including
804          * terminating '\0' characters for each).
805          */
806         vir_namelen = ceph_vxattrs_name_size(vxattrs);
807 
808         /* adding 1 byte per each variable due to the null termination */
809         namelen = ci->i_xattrs.names_size + ci->i_xattrs.count;
810         err = -ERANGE;
811         if (size && vir_namelen + namelen > size)
812                 goto out;
813 
814         err = namelen + vir_namelen;
815         if (size == 0)
816                 goto out;
817 
818         names = __copy_xattr_names(ci, names);
819 
820         /* virtual xattr names, too */
821         err = namelen;
822         if (vxattrs) {
823                 for (i = 0; vxattrs[i].name; i++) {
824                         if (!vxattrs[i].hidden &&
825                             !(vxattrs[i].exists_cb &&
826                               !vxattrs[i].exists_cb(ci))) {
827                                 len = sprintf(names, "%s", vxattrs[i].name);
828                                 names += len + 1;
829                                 err += len + 1;
830                         }
831                 }
832         }
833 
834 out:
835         spin_unlock(&ci->i_ceph_lock);
836         return err;
837 }
838 
839 static int ceph_sync_setxattr(struct dentry *dentry, const char *name,
840                               const char *value, size_t size, int flags)
841 {
842         struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
843         struct inode *inode = dentry->d_inode;
844         struct ceph_inode_info *ci = ceph_inode(inode);
845         struct inode *parent_inode;
846         struct ceph_mds_request *req;
847         struct ceph_mds_client *mdsc = fsc->mdsc;
848         int err;
849         int i, nr_pages;
850         struct page **pages = NULL;
851         void *kaddr;
852 
853         /* copy value into some pages */
854         nr_pages = calc_pages_for(0, size);
855         if (nr_pages) {
856                 pages = kmalloc(sizeof(pages[0])*nr_pages, GFP_NOFS);
857                 if (!pages)
858                         return -ENOMEM;
859                 err = -ENOMEM;
860                 for (i = 0; i < nr_pages; i++) {
861                         pages[i] = __page_cache_alloc(GFP_NOFS);
862                         if (!pages[i]) {
863                                 nr_pages = i;
864                                 goto out;
865                         }
866                         kaddr = kmap(pages[i]);
867                         memcpy(kaddr, value + i*PAGE_CACHE_SIZE,
868                                min(PAGE_CACHE_SIZE, size-i*PAGE_CACHE_SIZE));
869                 }
870         }
871 
872         dout("setxattr value=%.*s\n", (int)size, value);
873 
874         if (!value)
875                 flags |= CEPH_XATTR_REMOVE;
876 
877         /* do request */
878         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETXATTR,
879                                        USE_AUTH_MDS);
880         if (IS_ERR(req)) {
881                 err = PTR_ERR(req);
882                 goto out;
883         }
884         req->r_inode = inode;
885         ihold(inode);
886         req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
887         req->r_num_caps = 1;
888         req->r_args.setxattr.flags = cpu_to_le32(flags);
889         req->r_path2 = kstrdup(name, GFP_NOFS);
890 
891         req->r_pages = pages;
892         req->r_num_pages = nr_pages;
893         req->r_data_len = size;
894 
895         dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
896         parent_inode = ceph_get_dentry_parent_inode(dentry);
897         err = ceph_mdsc_do_request(mdsc, parent_inode, req);
898         iput(parent_inode);
899         ceph_mdsc_put_request(req);
900         dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
901 
902 out:
903         if (pages) {
904                 for (i = 0; i < nr_pages; i++)
905                         __free_page(pages[i]);
906                 kfree(pages);
907         }
908         return err;
909 }
910 
911 int __ceph_setxattr(struct dentry *dentry, const char *name,
912                         const void *value, size_t size, int flags)
913 {
914         struct inode *inode = dentry->d_inode;
915         struct ceph_vxattr *vxattr;
916         struct ceph_inode_info *ci = ceph_inode(inode);
917         int issued;
918         int err;
919         int dirty = 0;
920         int name_len = strlen(name);
921         int val_len = size;
922         char *newname = NULL;
923         char *newval = NULL;
924         struct ceph_inode_xattr *xattr = NULL;
925         int required_blob_size;
926 
927         if (!ceph_is_valid_xattr(name))
928                 return -EOPNOTSUPP;
929 
930         vxattr = ceph_match_vxattr(inode, name);
931         if (vxattr && vxattr->readonly)
932                 return -EOPNOTSUPP;
933 
934         /* pass any unhandled ceph.* xattrs through to the MDS */
935         if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
936                 goto do_sync_unlocked;
937 
938         /* preallocate memory for xattr name, value, index node */
939         err = -ENOMEM;
940         newname = kmemdup(name, name_len + 1, GFP_NOFS);
941         if (!newname)
942                 goto out;
943 
944         if (val_len) {
945                 newval = kmemdup(value, val_len, GFP_NOFS);
946                 if (!newval)
947                         goto out;
948         }
949 
950         xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS);
951         if (!xattr)
952                 goto out;
953 
954         spin_lock(&ci->i_ceph_lock);
955 retry:
956         issued = __ceph_caps_issued(ci, NULL);
957         dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued));
958         if (!(issued & CEPH_CAP_XATTR_EXCL))
959                 goto do_sync;
960         __build_xattrs(inode);
961 
962         required_blob_size = __get_required_blob_size(ci, name_len, val_len);
963 
964         if (!ci->i_xattrs.prealloc_blob ||
965             required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
966                 struct ceph_buffer *blob;
967 
968                 spin_unlock(&ci->i_ceph_lock);
969                 dout(" preaallocating new blob size=%d\n", required_blob_size);
970                 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
971                 if (!blob)
972                         goto out;
973                 spin_lock(&ci->i_ceph_lock);
974                 if (ci->i_xattrs.prealloc_blob)
975                         ceph_buffer_put(ci->i_xattrs.prealloc_blob);
976                 ci->i_xattrs.prealloc_blob = blob;
977                 goto retry;
978         }
979 
980         err = __set_xattr(ci, newname, name_len, newval, val_len,
981                           flags, value ? 1 : -1, &xattr);
982 
983         if (!err) {
984                 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
985                 ci->i_xattrs.dirty = true;
986                 inode->i_ctime = CURRENT_TIME;
987         }
988 
989         spin_unlock(&ci->i_ceph_lock);
990         if (dirty)
991                 __mark_inode_dirty(inode, dirty);
992         return err;
993 
994 do_sync:
995         spin_unlock(&ci->i_ceph_lock);
996 do_sync_unlocked:
997         err = ceph_sync_setxattr(dentry, name, value, size, flags);
998 out:
999         kfree(newname);
1000         kfree(newval);
1001         kfree(xattr);
1002         return err;
1003 }
1004 
1005 int ceph_setxattr(struct dentry *dentry, const char *name,
1006                   const void *value, size_t size, int flags)
1007 {
1008         if (ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
1009                 return -EROFS;
1010 
1011         if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
1012                 return generic_setxattr(dentry, name, value, size, flags);
1013 
1014         return __ceph_setxattr(dentry, name, value, size, flags);
1015 }
1016 
1017 static int ceph_send_removexattr(struct dentry *dentry, const char *name)
1018 {
1019         struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
1020         struct ceph_mds_client *mdsc = fsc->mdsc;
1021         struct inode *inode = dentry->d_inode;
1022         struct inode *parent_inode;
1023         struct ceph_mds_request *req;
1024         int err;
1025 
1026         req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RMXATTR,
1027                                        USE_AUTH_MDS);
1028         if (IS_ERR(req))
1029                 return PTR_ERR(req);
1030         req->r_inode = inode;
1031         ihold(inode);
1032         req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
1033         req->r_num_caps = 1;
1034         req->r_path2 = kstrdup(name, GFP_NOFS);
1035 
1036         parent_inode = ceph_get_dentry_parent_inode(dentry);
1037         err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1038         iput(parent_inode);
1039         ceph_mdsc_put_request(req);
1040         return err;
1041 }
1042 
1043 int __ceph_removexattr(struct dentry *dentry, const char *name)
1044 {
1045         struct inode *inode = dentry->d_inode;
1046         struct ceph_vxattr *vxattr;
1047         struct ceph_inode_info *ci = ceph_inode(inode);
1048         int issued;
1049         int err;
1050         int required_blob_size;
1051         int dirty;
1052 
1053         if (!ceph_is_valid_xattr(name))
1054                 return -EOPNOTSUPP;
1055 
1056         vxattr = ceph_match_vxattr(inode, name);
1057         if (vxattr && vxattr->readonly)
1058                 return -EOPNOTSUPP;
1059 
1060         /* pass any unhandled ceph.* xattrs through to the MDS */
1061         if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
1062                 goto do_sync_unlocked;
1063 
1064         err = -ENOMEM;
1065         spin_lock(&ci->i_ceph_lock);
1066 retry:
1067         issued = __ceph_caps_issued(ci, NULL);
1068         dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued));
1069 
1070         if (!(issued & CEPH_CAP_XATTR_EXCL))
1071                 goto do_sync;
1072         __build_xattrs(inode);
1073 
1074         required_blob_size = __get_required_blob_size(ci, 0, 0);
1075 
1076         if (!ci->i_xattrs.prealloc_blob ||
1077             required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
1078                 struct ceph_buffer *blob;
1079 
1080                 spin_unlock(&ci->i_ceph_lock);
1081                 dout(" preaallocating new blob size=%d\n", required_blob_size);
1082                 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
1083                 if (!blob)
1084                         goto out;
1085                 spin_lock(&ci->i_ceph_lock);
1086                 if (ci->i_xattrs.prealloc_blob)
1087                         ceph_buffer_put(ci->i_xattrs.prealloc_blob);
1088                 ci->i_xattrs.prealloc_blob = blob;
1089                 goto retry;
1090         }
1091 
1092         err = __remove_xattr_by_name(ceph_inode(inode), name);
1093 
1094         dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
1095         ci->i_xattrs.dirty = true;
1096         inode->i_ctime = CURRENT_TIME;
1097         spin_unlock(&ci->i_ceph_lock);
1098         if (dirty)
1099                 __mark_inode_dirty(inode, dirty);
1100         return err;
1101 do_sync:
1102         spin_unlock(&ci->i_ceph_lock);
1103 do_sync_unlocked:
1104         err = ceph_send_removexattr(dentry, name);
1105 out:
1106         return err;
1107 }
1108 
1109 int ceph_removexattr(struct dentry *dentry, const char *name)
1110 {
1111         if (ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
1112                 return -EROFS;
1113 
1114         if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
1115                 return generic_removexattr(dentry, name);
1116 
1117         return __ceph_removexattr(dentry, name);
1118 }
1119 

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