1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
3 #include <linux/ceph/pagelist.h>
6 #include "mds_client.h"
8 #include <linux/ceph/decode.h>
10 #include <linux/xattr.h>
11 #include <linux/posix_acl_xattr.h>
12 #include <linux/slab.h>
14 #define XATTR_CEPH_PREFIX "ceph."
15 #define XATTR_CEPH_PREFIX_LEN (sizeof (XATTR_CEPH_PREFIX) - 1)
17 static int __remove_xattr(struct ceph_inode_info *ci,
18 struct ceph_inode_xattr *xattr);
20 static const struct xattr_handler ceph_other_xattr_handler;
23 * List of handlers for synthetic system.* attributes. Other
24 * attributes are handled directly.
26 const struct xattr_handler *ceph_xattr_handlers[] = {
27 #ifdef CONFIG_CEPH_FS_POSIX_ACL
28 &posix_acl_access_xattr_handler,
29 &posix_acl_default_xattr_handler,
31 &ceph_other_xattr_handler,
35 static bool ceph_is_valid_xattr(const char *name)
37 return !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) ||
38 !strncmp(name, XATTR_SECURITY_PREFIX,
39 XATTR_SECURITY_PREFIX_LEN) ||
40 !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) ||
41 !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
45 * These define virtual xattrs exposing the recursive directory
46 * statistics and layout metadata.
50 size_t name_size; /* strlen(name) + 1 (for '\0') */
51 size_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val,
53 bool (*exists_cb)(struct ceph_inode_info *ci);
57 #define VXATTR_FLAG_READONLY (1<<0)
58 #define VXATTR_FLAG_HIDDEN (1<<1)
59 #define VXATTR_FLAG_RSTAT (1<<2)
63 static bool ceph_vxattrcb_layout_exists(struct ceph_inode_info *ci)
65 struct ceph_file_layout *fl = &ci->i_layout;
66 return (fl->stripe_unit > 0 || fl->stripe_count > 0 ||
67 fl->object_size > 0 || fl->pool_id >= 0 ||
68 rcu_dereference_raw(fl->pool_ns) != NULL);
71 static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
74 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
75 struct ceph_osd_client *osdc = &fsc->client->osdc;
76 struct ceph_string *pool_ns;
77 s64 pool = ci->i_layout.pool_id;
78 const char *pool_name;
79 const char *ns_field = " pool_namespace=";
81 size_t len, total_len = 0;
84 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);
86 dout("ceph_vxattrcb_layout %p\n", &ci->vfs_inode);
87 down_read(&osdc->lock);
88 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
90 len = snprintf(buf, sizeof(buf),
91 "stripe_unit=%u stripe_count=%u object_size=%u pool=",
92 ci->i_layout.stripe_unit, ci->i_layout.stripe_count,
93 ci->i_layout.object_size);
94 total_len = len + strlen(pool_name);
96 len = snprintf(buf, sizeof(buf),
97 "stripe_unit=%u stripe_count=%u object_size=%u pool=%lld",
98 ci->i_layout.stripe_unit, ci->i_layout.stripe_count,
99 ci->i_layout.object_size, (unsigned long long)pool);
104 total_len += strlen(ns_field) + pool_ns->len;
108 } else if (total_len > size) {
111 memcpy(val, buf, len);
114 len = strlen(pool_name);
115 memcpy(val + ret, pool_name, len);
119 len = strlen(ns_field);
120 memcpy(val + ret, ns_field, len);
122 memcpy(val + ret, pool_ns->str, pool_ns->len);
126 up_read(&osdc->lock);
127 ceph_put_string(pool_ns);
131 static size_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci,
132 char *val, size_t size)
134 return snprintf(val, size, "%u", ci->i_layout.stripe_unit);
137 static size_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci,
138 char *val, size_t size)
140 return snprintf(val, size, "%u", ci->i_layout.stripe_count);
143 static size_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci,
144 char *val, size_t size)
146 return snprintf(val, size, "%u", ci->i_layout.object_size);
149 static size_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci,
150 char *val, size_t size)
153 struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
154 struct ceph_osd_client *osdc = &fsc->client->osdc;
155 s64 pool = ci->i_layout.pool_id;
156 const char *pool_name;
158 down_read(&osdc->lock);
159 pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
161 ret = snprintf(val, size, "%s", pool_name);
163 ret = snprintf(val, size, "%lld", (unsigned long long)pool);
164 up_read(&osdc->lock);
168 static size_t ceph_vxattrcb_layout_pool_namespace(struct ceph_inode_info *ci,
169 char *val, size_t size)
172 struct ceph_string *ns = ceph_try_get_string(ci->i_layout.pool_ns);
174 ret = snprintf(val, size, "%.*s", (int)ns->len, ns->str);
182 static size_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val,
185 return snprintf(val, size, "%lld", ci->i_files + ci->i_subdirs);
188 static size_t ceph_vxattrcb_dir_files(struct ceph_inode_info *ci, char *val,
191 return snprintf(val, size, "%lld", ci->i_files);
194 static size_t ceph_vxattrcb_dir_subdirs(struct ceph_inode_info *ci, char *val,
197 return snprintf(val, size, "%lld", ci->i_subdirs);
200 static size_t ceph_vxattrcb_dir_rentries(struct ceph_inode_info *ci, char *val,
203 return snprintf(val, size, "%lld", ci->i_rfiles + ci->i_rsubdirs);
206 static size_t ceph_vxattrcb_dir_rfiles(struct ceph_inode_info *ci, char *val,
209 return snprintf(val, size, "%lld", ci->i_rfiles);
212 static size_t ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info *ci, char *val,
215 return snprintf(val, size, "%lld", ci->i_rsubdirs);
218 static size_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val,
221 return snprintf(val, size, "%lld", ci->i_rbytes);
224 static size_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val,
227 return snprintf(val, size, "%lld.09%ld", ci->i_rctime.tv_sec,
228 ci->i_rctime.tv_nsec);
232 static bool ceph_vxattrcb_dir_pin_exists(struct ceph_inode_info *ci)
234 return ci->i_dir_pin != -ENODATA;
237 static size_t ceph_vxattrcb_dir_pin(struct ceph_inode_info *ci, char *val,
240 return snprintf(val, size, "%d", (int)ci->i_dir_pin);
244 static bool ceph_vxattrcb_quota_exists(struct ceph_inode_info *ci)
247 spin_lock(&ci->i_ceph_lock);
248 if ((ci->i_max_files || ci->i_max_bytes) &&
249 ci->i_vino.snap == CEPH_NOSNAP &&
251 ci->i_snap_realm->ino == ci->i_vino.ino)
253 spin_unlock(&ci->i_ceph_lock);
257 static size_t ceph_vxattrcb_quota(struct ceph_inode_info *ci, char *val,
260 return snprintf(val, size, "max_bytes=%llu max_files=%llu",
261 ci->i_max_bytes, ci->i_max_files);
264 static size_t ceph_vxattrcb_quota_max_bytes(struct ceph_inode_info *ci,
265 char *val, size_t size)
267 return snprintf(val, size, "%llu", ci->i_max_bytes);
270 static size_t ceph_vxattrcb_quota_max_files(struct ceph_inode_info *ci,
271 char *val, size_t size)
273 return snprintf(val, size, "%llu", ci->i_max_files);
276 #define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name
277 #define CEPH_XATTR_NAME2(_type, _name, _name2) \
278 XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
280 #define XATTR_NAME_CEPH(_type, _name, _flags) \
282 .name = CEPH_XATTR_NAME(_type, _name), \
283 .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \
284 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
286 .flags = (VXATTR_FLAG_READONLY | _flags), \
288 #define XATTR_RSTAT_FIELD(_type, _name) \
289 XATTR_NAME_CEPH(_type, _name, VXATTR_FLAG_RSTAT)
290 #define XATTR_LAYOUT_FIELD(_type, _name, _field) \
292 .name = CEPH_XATTR_NAME2(_type, _name, _field), \
293 .name_size = sizeof (CEPH_XATTR_NAME2(_type, _name, _field)), \
294 .getxattr_cb = ceph_vxattrcb_ ## _name ## _ ## _field, \
295 .exists_cb = ceph_vxattrcb_layout_exists, \
296 .flags = VXATTR_FLAG_HIDDEN, \
298 #define XATTR_QUOTA_FIELD(_type, _name) \
300 .name = CEPH_XATTR_NAME(_type, _name), \
301 .name_size = sizeof(CEPH_XATTR_NAME(_type, _name)), \
302 .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
303 .exists_cb = ceph_vxattrcb_quota_exists, \
304 .flags = VXATTR_FLAG_HIDDEN, \
307 static struct ceph_vxattr ceph_dir_vxattrs[] = {
309 .name = "ceph.dir.layout",
310 .name_size = sizeof("ceph.dir.layout"),
311 .getxattr_cb = ceph_vxattrcb_layout,
312 .exists_cb = ceph_vxattrcb_layout_exists,
313 .flags = VXATTR_FLAG_HIDDEN,
315 XATTR_LAYOUT_FIELD(dir, layout, stripe_unit),
316 XATTR_LAYOUT_FIELD(dir, layout, stripe_count),
317 XATTR_LAYOUT_FIELD(dir, layout, object_size),
318 XATTR_LAYOUT_FIELD(dir, layout, pool),
319 XATTR_LAYOUT_FIELD(dir, layout, pool_namespace),
320 XATTR_NAME_CEPH(dir, entries, 0),
321 XATTR_NAME_CEPH(dir, files, 0),
322 XATTR_NAME_CEPH(dir, subdirs, 0),
323 XATTR_RSTAT_FIELD(dir, rentries),
324 XATTR_RSTAT_FIELD(dir, rfiles),
325 XATTR_RSTAT_FIELD(dir, rsubdirs),
326 XATTR_RSTAT_FIELD(dir, rbytes),
327 XATTR_RSTAT_FIELD(dir, rctime),
329 .name = "ceph.dir.pin",
330 .name_size = sizeof("ceph.dir_pin"),
331 .getxattr_cb = ceph_vxattrcb_dir_pin,
332 .exists_cb = ceph_vxattrcb_dir_pin_exists,
333 .flags = VXATTR_FLAG_HIDDEN,
336 .name = "ceph.quota",
337 .name_size = sizeof("ceph.quota"),
338 .getxattr_cb = ceph_vxattrcb_quota,
339 .exists_cb = ceph_vxattrcb_quota_exists,
340 .flags = VXATTR_FLAG_HIDDEN,
342 XATTR_QUOTA_FIELD(quota, max_bytes),
343 XATTR_QUOTA_FIELD(quota, max_files),
344 { .name = NULL, 0 } /* Required table terminator */
346 static size_t ceph_dir_vxattrs_name_size; /* total size of all names */
350 static struct ceph_vxattr ceph_file_vxattrs[] = {
352 .name = "ceph.file.layout",
353 .name_size = sizeof("ceph.file.layout"),
354 .getxattr_cb = ceph_vxattrcb_layout,
355 .exists_cb = ceph_vxattrcb_layout_exists,
356 .flags = VXATTR_FLAG_HIDDEN,
358 XATTR_LAYOUT_FIELD(file, layout, stripe_unit),
359 XATTR_LAYOUT_FIELD(file, layout, stripe_count),
360 XATTR_LAYOUT_FIELD(file, layout, object_size),
361 XATTR_LAYOUT_FIELD(file, layout, pool),
362 XATTR_LAYOUT_FIELD(file, layout, pool_namespace),
363 { .name = NULL, 0 } /* Required table terminator */
365 static size_t ceph_file_vxattrs_name_size; /* total size of all names */
367 static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode)
369 if (S_ISDIR(inode->i_mode))
370 return ceph_dir_vxattrs;
371 else if (S_ISREG(inode->i_mode))
372 return ceph_file_vxattrs;
376 static size_t ceph_vxattrs_name_size(struct ceph_vxattr *vxattrs)
378 if (vxattrs == ceph_dir_vxattrs)
379 return ceph_dir_vxattrs_name_size;
380 if (vxattrs == ceph_file_vxattrs)
381 return ceph_file_vxattrs_name_size;
387 * Compute the aggregate size (including terminating '\0') of all
388 * virtual extended attribute names in the given vxattr table.
390 static size_t __init vxattrs_name_size(struct ceph_vxattr *vxattrs)
392 struct ceph_vxattr *vxattr;
395 for (vxattr = vxattrs; vxattr->name; vxattr++) {
396 if (!(vxattr->flags & VXATTR_FLAG_HIDDEN))
397 size += vxattr->name_size;
403 /* Routines called at initialization and exit time */
405 void __init ceph_xattr_init(void)
407 ceph_dir_vxattrs_name_size = vxattrs_name_size(ceph_dir_vxattrs);
408 ceph_file_vxattrs_name_size = vxattrs_name_size(ceph_file_vxattrs);
411 void ceph_xattr_exit(void)
413 ceph_dir_vxattrs_name_size = 0;
414 ceph_file_vxattrs_name_size = 0;
417 static struct ceph_vxattr *ceph_match_vxattr(struct inode *inode,
420 struct ceph_vxattr *vxattr = ceph_inode_vxattrs(inode);
423 while (vxattr->name) {
424 if (!strcmp(vxattr->name, name))
433 static int __set_xattr(struct ceph_inode_info *ci,
434 const char *name, int name_len,
435 const char *val, int val_len,
436 int flags, int update_xattr,
437 struct ceph_inode_xattr **newxattr)
440 struct rb_node *parent = NULL;
441 struct ceph_inode_xattr *xattr = NULL;
445 p = &ci->i_xattrs.index.rb_node;
448 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
449 c = strncmp(name, xattr->name, min(name_len, xattr->name_len));
455 if (name_len == xattr->name_len)
457 else if (name_len < xattr->name_len)
468 if (xattr && (flags & XATTR_CREATE))
470 else if (!xattr && (flags & XATTR_REPLACE))
478 if (update_xattr < 0) {
480 __remove_xattr(ci, xattr);
491 xattr->name_len = name_len;
492 xattr->should_free_name = update_xattr;
494 ci->i_xattrs.count++;
495 dout("__set_xattr count=%d\n", ci->i_xattrs.count);
499 if (xattr->should_free_val)
500 kfree((void *)xattr->val);
506 ci->i_xattrs.names_size -= xattr->name_len;
507 ci->i_xattrs.vals_size -= xattr->val_len;
509 ci->i_xattrs.names_size += name_len;
510 ci->i_xattrs.vals_size += val_len;
516 xattr->val_len = val_len;
517 xattr->dirty = update_xattr;
518 xattr->should_free_val = (val && update_xattr);
521 rb_link_node(&xattr->node, parent, p);
522 rb_insert_color(&xattr->node, &ci->i_xattrs.index);
523 dout("__set_xattr_val p=%p\n", p);
526 dout("__set_xattr_val added %llx.%llx xattr %p %s=%.*s\n",
527 ceph_vinop(&ci->vfs_inode), xattr, name, val_len, val);
532 static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci,
536 struct rb_node *parent = NULL;
537 struct ceph_inode_xattr *xattr = NULL;
538 int name_len = strlen(name);
541 p = &ci->i_xattrs.index.rb_node;
544 xattr = rb_entry(parent, struct ceph_inode_xattr, node);
545 c = strncmp(name, xattr->name, xattr->name_len);
546 if (c == 0 && name_len > xattr->name_len)
553 dout("__get_xattr %s: found %.*s\n", name,
554 xattr->val_len, xattr->val);
559 dout("__get_xattr %s: not found\n", name);
564 static void __free_xattr(struct ceph_inode_xattr *xattr)
568 if (xattr->should_free_name)
569 kfree((void *)xattr->name);
570 if (xattr->should_free_val)
571 kfree((void *)xattr->val);
576 static int __remove_xattr(struct ceph_inode_info *ci,
577 struct ceph_inode_xattr *xattr)
582 rb_erase(&xattr->node, &ci->i_xattrs.index);
584 if (xattr->should_free_name)
585 kfree((void *)xattr->name);
586 if (xattr->should_free_val)
587 kfree((void *)xattr->val);
589 ci->i_xattrs.names_size -= xattr->name_len;
590 ci->i_xattrs.vals_size -= xattr->val_len;
591 ci->i_xattrs.count--;
597 static char *__copy_xattr_names(struct ceph_inode_info *ci,
601 struct ceph_inode_xattr *xattr = NULL;
603 p = rb_first(&ci->i_xattrs.index);
604 dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count);
607 xattr = rb_entry(p, struct ceph_inode_xattr, node);
608 memcpy(dest, xattr->name, xattr->name_len);
609 dest[xattr->name_len] = '\0';
611 dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name,
612 xattr->name_len, ci->i_xattrs.names_size);
614 dest += xattr->name_len + 1;
621 void __ceph_destroy_xattrs(struct ceph_inode_info *ci)
623 struct rb_node *p, *tmp;
624 struct ceph_inode_xattr *xattr = NULL;
626 p = rb_first(&ci->i_xattrs.index);
628 dout("__ceph_destroy_xattrs p=%p\n", p);
631 xattr = rb_entry(p, struct ceph_inode_xattr, node);
634 dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p,
635 xattr->name_len, xattr->name);
636 rb_erase(tmp, &ci->i_xattrs.index);
641 ci->i_xattrs.names_size = 0;
642 ci->i_xattrs.vals_size = 0;
643 ci->i_xattrs.index_version = 0;
644 ci->i_xattrs.count = 0;
645 ci->i_xattrs.index = RB_ROOT;
648 static int __build_xattrs(struct inode *inode)
649 __releases(ci->i_ceph_lock)
650 __acquires(ci->i_ceph_lock)
656 const char *name, *val;
657 struct ceph_inode_info *ci = ceph_inode(inode);
659 struct ceph_inode_xattr **xattrs = NULL;
663 dout("__build_xattrs() len=%d\n",
664 ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0);
666 if (ci->i_xattrs.index_version >= ci->i_xattrs.version)
667 return 0; /* already built */
669 __ceph_destroy_xattrs(ci);
672 /* updated internal xattr rb tree */
673 if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) {
674 p = ci->i_xattrs.blob->vec.iov_base;
675 end = p + ci->i_xattrs.blob->vec.iov_len;
676 ceph_decode_32_safe(&p, end, numattr, bad);
677 xattr_version = ci->i_xattrs.version;
678 spin_unlock(&ci->i_ceph_lock);
680 xattrs = kcalloc(numattr, sizeof(struct ceph_inode_xattr *),
686 for (i = 0; i < numattr; i++) {
687 xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr),
693 spin_lock(&ci->i_ceph_lock);
694 if (ci->i_xattrs.version != xattr_version) {
695 /* lost a race, retry */
696 for (i = 0; i < numattr; i++)
704 ceph_decode_32_safe(&p, end, len, bad);
708 ceph_decode_32_safe(&p, end, len, bad);
712 err = __set_xattr(ci, name, namelen, val, len,
713 0, 0, &xattrs[numattr]);
720 ci->i_xattrs.index_version = ci->i_xattrs.version;
721 ci->i_xattrs.dirty = false;
725 spin_lock(&ci->i_ceph_lock);
728 for (i = 0; i < numattr; i++)
732 ci->i_xattrs.names_size = 0;
736 static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size,
740 * 4 bytes for the length, and additional 4 bytes per each xattr name,
741 * 4 bytes per each value
743 int size = 4 + ci->i_xattrs.count*(4 + 4) +
744 ci->i_xattrs.names_size +
745 ci->i_xattrs.vals_size;
746 dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n",
747 ci->i_xattrs.count, ci->i_xattrs.names_size,
748 ci->i_xattrs.vals_size);
751 size += 4 + 4 + name_size + val_size;
757 * If there are dirty xattrs, reencode xattrs into the prealloc_blob
758 * and swap into place.
760 void __ceph_build_xattrs_blob(struct ceph_inode_info *ci)
763 struct ceph_inode_xattr *xattr = NULL;
766 dout("__build_xattrs_blob %p\n", &ci->vfs_inode);
767 if (ci->i_xattrs.dirty) {
768 int need = __get_required_blob_size(ci, 0, 0);
770 BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len);
772 p = rb_first(&ci->i_xattrs.index);
773 dest = ci->i_xattrs.prealloc_blob->vec.iov_base;
775 ceph_encode_32(&dest, ci->i_xattrs.count);
777 xattr = rb_entry(p, struct ceph_inode_xattr, node);
779 ceph_encode_32(&dest, xattr->name_len);
780 memcpy(dest, xattr->name, xattr->name_len);
781 dest += xattr->name_len;
782 ceph_encode_32(&dest, xattr->val_len);
783 memcpy(dest, xattr->val, xattr->val_len);
784 dest += xattr->val_len;
789 /* adjust buffer len; it may be larger than we need */
790 ci->i_xattrs.prealloc_blob->vec.iov_len =
791 dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
793 if (ci->i_xattrs.blob)
794 ceph_buffer_put(ci->i_xattrs.blob);
795 ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
796 ci->i_xattrs.prealloc_blob = NULL;
797 ci->i_xattrs.dirty = false;
798 ci->i_xattrs.version++;
802 static inline int __get_request_mask(struct inode *in) {
803 struct ceph_mds_request *req = current->journal_info;
805 if (req && req->r_target_inode == in) {
806 if (req->r_op == CEPH_MDS_OP_LOOKUP ||
807 req->r_op == CEPH_MDS_OP_LOOKUPINO ||
808 req->r_op == CEPH_MDS_OP_LOOKUPPARENT ||
809 req->r_op == CEPH_MDS_OP_GETATTR) {
810 mask = le32_to_cpu(req->r_args.getattr.mask);
811 } else if (req->r_op == CEPH_MDS_OP_OPEN ||
812 req->r_op == CEPH_MDS_OP_CREATE) {
813 mask = le32_to_cpu(req->r_args.open.mask);
819 ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
822 struct ceph_inode_info *ci = ceph_inode(inode);
823 struct ceph_inode_xattr *xattr;
824 struct ceph_vxattr *vxattr = NULL;
828 /* let's see if a virtual xattr was requested */
829 vxattr = ceph_match_vxattr(inode, name);
832 if (vxattr->flags & VXATTR_FLAG_RSTAT)
833 mask |= CEPH_STAT_RSTAT;
834 err = ceph_do_getattr(inode, mask, true);
838 if (!(vxattr->exists_cb && !vxattr->exists_cb(ci)))
839 err = vxattr->getxattr_cb(ci, value, size);
843 req_mask = __get_request_mask(inode);
845 spin_lock(&ci->i_ceph_lock);
846 dout("getxattr %p ver=%lld index_ver=%lld\n", inode,
847 ci->i_xattrs.version, ci->i_xattrs.index_version);
849 if (ci->i_xattrs.version == 0 ||
850 !((req_mask & CEPH_CAP_XATTR_SHARED) ||
851 __ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1))) {
852 spin_unlock(&ci->i_ceph_lock);
854 /* security module gets xattr while filling trace */
855 if (current->journal_info) {
856 pr_warn_ratelimited("sync getxattr %p "
857 "during filling trace\n", inode);
861 /* get xattrs from mds (if we don't already have them) */
862 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
865 spin_lock(&ci->i_ceph_lock);
868 err = __build_xattrs(inode);
872 err = -ENODATA; /* == ENOATTR */
873 xattr = __get_xattr(ci, name);
878 if (size && size < xattr->val_len)
881 err = xattr->val_len;
885 memcpy(value, xattr->val, xattr->val_len);
887 if (current->journal_info &&
888 !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN))
889 ci->i_ceph_flags |= CEPH_I_SEC_INITED;
891 spin_unlock(&ci->i_ceph_lock);
895 ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
897 struct inode *inode = d_inode(dentry);
898 struct ceph_inode_info *ci = ceph_inode(inode);
899 struct ceph_vxattr *vxattrs = ceph_inode_vxattrs(inode);
906 spin_lock(&ci->i_ceph_lock);
907 dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
908 ci->i_xattrs.version, ci->i_xattrs.index_version);
910 if (ci->i_xattrs.version == 0 ||
911 !__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1)) {
912 spin_unlock(&ci->i_ceph_lock);
913 err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
916 spin_lock(&ci->i_ceph_lock);
919 err = __build_xattrs(inode);
923 * Start with virtual dir xattr names (if any) (including
924 * terminating '\0' characters for each).
926 vir_namelen = ceph_vxattrs_name_size(vxattrs);
928 /* adding 1 byte per each variable due to the null termination */
929 namelen = ci->i_xattrs.names_size + ci->i_xattrs.count;
931 if (size && vir_namelen + namelen > size)
934 err = namelen + vir_namelen;
938 names = __copy_xattr_names(ci, names);
940 /* virtual xattr names, too */
943 for (i = 0; vxattrs[i].name; i++) {
944 if (!(vxattrs[i].flags & VXATTR_FLAG_HIDDEN) &&
945 !(vxattrs[i].exists_cb &&
946 !vxattrs[i].exists_cb(ci))) {
947 len = sprintf(names, "%s", vxattrs[i].name);
955 spin_unlock(&ci->i_ceph_lock);
959 static int ceph_sync_setxattr(struct inode *inode, const char *name,
960 const char *value, size_t size, int flags)
962 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
963 struct ceph_inode_info *ci = ceph_inode(inode);
964 struct ceph_mds_request *req;
965 struct ceph_mds_client *mdsc = fsc->mdsc;
966 struct ceph_pagelist *pagelist = NULL;
967 int op = CEPH_MDS_OP_SETXATTR;
971 /* copy value into pagelist */
972 pagelist = ceph_pagelist_alloc(GFP_NOFS);
976 err = ceph_pagelist_append(pagelist, value, size);
980 if (flags & CEPH_XATTR_REPLACE)
981 op = CEPH_MDS_OP_RMXATTR;
983 flags |= CEPH_XATTR_REMOVE;
986 dout("setxattr value=%.*s\n", (int)size, value);
989 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
995 req->r_path2 = kstrdup(name, GFP_NOFS);
997 ceph_mdsc_put_request(req);
1002 if (op == CEPH_MDS_OP_SETXATTR) {
1003 req->r_args.setxattr.flags = cpu_to_le32(flags);
1004 req->r_pagelist = pagelist;
1008 req->r_inode = inode;
1010 req->r_num_caps = 1;
1011 req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
1013 dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
1014 err = ceph_mdsc_do_request(mdsc, NULL, req);
1015 ceph_mdsc_put_request(req);
1016 dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
1020 ceph_pagelist_release(pagelist);
1024 int __ceph_setxattr(struct inode *inode, const char *name,
1025 const void *value, size_t size, int flags)
1027 struct ceph_vxattr *vxattr;
1028 struct ceph_inode_info *ci = ceph_inode(inode);
1029 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1030 struct ceph_cap_flush *prealloc_cf = NULL;
1034 int name_len = strlen(name);
1036 char *newname = NULL;
1037 char *newval = NULL;
1038 struct ceph_inode_xattr *xattr = NULL;
1039 int required_blob_size;
1040 bool check_realm = false;
1041 bool lock_snap_rwsem = false;
1043 if (ceph_snap(inode) != CEPH_NOSNAP)
1046 vxattr = ceph_match_vxattr(inode, name);
1048 if (vxattr->flags & VXATTR_FLAG_READONLY)
1050 if (value && !strncmp(vxattr->name, "ceph.quota", 10))
1054 /* pass any unhandled ceph.* xattrs through to the MDS */
1055 if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
1056 goto do_sync_unlocked;
1058 /* preallocate memory for xattr name, value, index node */
1060 newname = kmemdup(name, name_len + 1, GFP_NOFS);
1065 newval = kmemdup(value, val_len, GFP_NOFS);
1070 xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS);
1074 prealloc_cf = ceph_alloc_cap_flush();
1078 spin_lock(&ci->i_ceph_lock);
1080 issued = __ceph_caps_issued(ci, NULL);
1081 if (ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))
1084 if (!lock_snap_rwsem && !ci->i_head_snapc) {
1085 lock_snap_rwsem = true;
1086 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1087 spin_unlock(&ci->i_ceph_lock);
1088 down_read(&mdsc->snap_rwsem);
1089 spin_lock(&ci->i_ceph_lock);
1094 dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued));
1095 __build_xattrs(inode);
1097 required_blob_size = __get_required_blob_size(ci, name_len, val_len);
1099 if (!ci->i_xattrs.prealloc_blob ||
1100 required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
1101 struct ceph_buffer *blob;
1103 spin_unlock(&ci->i_ceph_lock);
1104 dout(" preaallocating new blob size=%d\n", required_blob_size);
1105 blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
1107 goto do_sync_unlocked;
1108 spin_lock(&ci->i_ceph_lock);
1109 if (ci->i_xattrs.prealloc_blob)
1110 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
1111 ci->i_xattrs.prealloc_blob = blob;
1115 err = __set_xattr(ci, newname, name_len, newval, val_len,
1116 flags, value ? 1 : -1, &xattr);
1119 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL,
1121 ci->i_xattrs.dirty = true;
1122 inode->i_ctime = current_time(inode);
1125 spin_unlock(&ci->i_ceph_lock);
1126 if (lock_snap_rwsem)
1127 up_read(&mdsc->snap_rwsem);
1129 __mark_inode_dirty(inode, dirty);
1130 ceph_free_cap_flush(prealloc_cf);
1134 spin_unlock(&ci->i_ceph_lock);
1136 if (lock_snap_rwsem)
1137 up_read(&mdsc->snap_rwsem);
1139 /* security module set xattr while filling trace */
1140 if (current->journal_info) {
1141 pr_warn_ratelimited("sync setxattr %p "
1142 "during filling trace\n", inode);
1145 err = ceph_sync_setxattr(inode, name, value, size, flags);
1146 if (err >= 0 && check_realm) {
1147 /* check if snaprealm was created for quota inode */
1148 spin_lock(&ci->i_ceph_lock);
1149 if ((ci->i_max_files || ci->i_max_bytes) &&
1150 !(ci->i_snap_realm &&
1151 ci->i_snap_realm->ino == ci->i_vino.ino))
1153 spin_unlock(&ci->i_ceph_lock);
1157 ceph_free_cap_flush(prealloc_cf);
1164 static int ceph_get_xattr_handler(const struct xattr_handler *handler,
1165 struct dentry *dentry, struct inode *inode,
1166 const char *name, void *value, size_t size)
1168 if (!ceph_is_valid_xattr(name))
1170 return __ceph_getxattr(inode, name, value, size);
1173 static int ceph_set_xattr_handler(const struct xattr_handler *handler,
1174 struct dentry *unused, struct inode *inode,
1175 const char *name, const void *value,
1176 size_t size, int flags)
1178 if (!ceph_is_valid_xattr(name))
1180 return __ceph_setxattr(inode, name, value, size, flags);
1183 static const struct xattr_handler ceph_other_xattr_handler = {
1184 .prefix = "", /* match any name => handlers called with full name */
1185 .get = ceph_get_xattr_handler,
1186 .set = ceph_set_xattr_handler,
1189 #ifdef CONFIG_SECURITY
1190 bool ceph_security_xattr_wanted(struct inode *in)
1192 return in->i_security != NULL;
1195 bool ceph_security_xattr_deadlock(struct inode *in)
1197 struct ceph_inode_info *ci;
1199 if (!in->i_security)
1201 ci = ceph_inode(in);
1202 spin_lock(&ci->i_ceph_lock);
1203 ret = !(ci->i_ceph_flags & CEPH_I_SEC_INITED) &&
1204 !(ci->i_xattrs.version > 0 &&
1205 __ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0));
1206 spin_unlock(&ci->i_ceph_lock);