4 Extended attribute handling.
6 Copyright (C) 2001 by Andreas Gruenbacher <a.gruenbacher@computer.org>
7 Copyright (C) 2001 SGI - Silicon Graphics, Inc <linux-xfs@oss.sgi.com>
8 Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
11 #include <linux/slab.h>
12 #include <linux/file.h>
13 #include <linux/xattr.h>
14 #include <linux/mount.h>
15 #include <linux/namei.h>
16 #include <linux/security.h>
17 #include <linux/evm.h>
18 #include <linux/syscalls.h>
19 #include <linux/export.h>
20 #include <linux/fsnotify.h>
21 #include <linux/audit.h>
22 #include <linux/vmalloc.h>
23 #include <linux/posix_acl_xattr.h>
25 #include <asm/uaccess.h>
28 strcmp_prefix(const char *a
, const char *a_prefix
)
30 while (*a_prefix
&& *a
== *a_prefix
) {
34 return *a_prefix
? NULL
: a
;
38 * In order to implement different sets of xattr operations for each xattr
39 * prefix with the generic xattr API, a filesystem should create a
40 * null-terminated array of struct xattr_handler (one for each prefix) and
41 * hang a pointer to it off of the s_xattr field of the superblock.
43 * The generic_fooxattr() functions will use this list to dispatch xattr
44 * operations to the correct xattr_handler.
46 #define for_each_xattr_handler(handlers, handler) \
48 for ((handler) = *(handlers)++; \
50 (handler) = *(handlers)++)
53 * Find the xattr_handler with the matching prefix.
55 static const struct xattr_handler
*
56 xattr_resolve_name(struct inode
*inode
, const char **name
)
58 const struct xattr_handler
**handlers
= inode
->i_sb
->s_xattr
;
59 const struct xattr_handler
*handler
;
61 if (!(inode
->i_opflags
& IOP_XATTR
))
62 return ERR_PTR(-EOPNOTSUPP
);
63 for_each_xattr_handler(handlers
, handler
) {
66 n
= strcmp_prefix(*name
, xattr_prefix(handler
));
68 if (!handler
->prefix
^ !*n
) {
71 return ERR_PTR(-EINVAL
);
77 return ERR_PTR(-EOPNOTSUPP
);
81 * Check permissions for extended attribute access. This is a bit complicated
82 * because different namespaces have very different rules.
85 xattr_permission(struct inode
*inode
, const char *name
, int mask
)
88 * We can never set or remove an extended attribute on a read-only
89 * filesystem or on an immutable / append-only inode.
91 if (mask
& MAY_WRITE
) {
92 if (IS_IMMUTABLE(inode
) || IS_APPEND(inode
))
95 * Updating an xattr will likely cause i_uid and i_gid
96 * to be writen back improperly if their true value is
99 if (HAS_UNMAPPED_ID(inode
))
104 * No restriction for security.* and system.* from the VFS. Decision
105 * on these is left to the underlying filesystem / security module.
107 if (!strncmp(name
, XATTR_SECURITY_PREFIX
, XATTR_SECURITY_PREFIX_LEN
) ||
108 !strncmp(name
, XATTR_SYSTEM_PREFIX
, XATTR_SYSTEM_PREFIX_LEN
))
112 * The trusted.* namespace can only be accessed by privileged users.
114 if (!strncmp(name
, XATTR_TRUSTED_PREFIX
, XATTR_TRUSTED_PREFIX_LEN
)) {
115 if (!capable(CAP_SYS_ADMIN
))
116 return (mask
& MAY_WRITE
) ? -EPERM
: -ENODATA
;
121 * In the user.* namespace, only regular files and directories can have
122 * extended attributes. For sticky directories, only the owner and
123 * privileged users can write attributes.
125 if (!strncmp(name
, XATTR_USER_PREFIX
, XATTR_USER_PREFIX_LEN
)) {
126 if (!S_ISREG(inode
->i_mode
) && !S_ISDIR(inode
->i_mode
))
127 return (mask
& MAY_WRITE
) ? -EPERM
: -ENODATA
;
128 if (S_ISDIR(inode
->i_mode
) && (inode
->i_mode
& S_ISVTX
) &&
129 (mask
& MAY_WRITE
) && !inode_owner_or_capable(inode
))
133 return inode_permission(inode
, mask
);
137 * __vfs_setxattr_noperm - perform setxattr operation without performing
140 * @dentry - object to perform setxattr on
141 * @name - xattr name to set
142 * @value - value to set @name to
143 * @size - size of @value
144 * @flags - flags to pass into filesystem operations
146 * returns the result of the internal setxattr or setsecurity operations.
148 * This function requires the caller to lock the inode's i_mutex before it
149 * is executed. It also assumes that the caller will make the appropriate
152 int __vfs_setxattr_noperm(struct dentry
*dentry
, const char *name
,
153 const void *value
, size_t size
, int flags
)
155 struct inode
*inode
= dentry
->d_inode
;
156 int error
= -EOPNOTSUPP
;
157 int issec
= !strncmp(name
, XATTR_SECURITY_PREFIX
,
158 XATTR_SECURITY_PREFIX_LEN
);
161 inode
->i_flags
&= ~S_NOSEC
;
162 if (inode
->i_op
->setxattr
) {
163 error
= inode
->i_op
->setxattr(dentry
, inode
, name
, value
, size
, flags
);
165 fsnotify_xattr(dentry
);
166 security_inode_post_setxattr(dentry
, name
, value
,
170 const char *suffix
= name
+ XATTR_SECURITY_PREFIX_LEN
;
171 error
= security_inode_setsecurity(inode
, suffix
, value
,
174 fsnotify_xattr(dentry
);
182 vfs_setxattr(struct dentry
*dentry
, const char *name
, const void *value
,
183 size_t size
, int flags
)
185 struct inode
*inode
= dentry
->d_inode
;
188 error
= xattr_permission(inode
, name
, MAY_WRITE
);
193 error
= security_inode_setxattr(dentry
, name
, value
, size
, flags
);
197 error
= __vfs_setxattr_noperm(dentry
, name
, value
, size
, flags
);
203 EXPORT_SYMBOL_GPL(vfs_setxattr
);
206 xattr_getsecurity(struct inode
*inode
, const char *name
, void *value
,
212 if (!value
|| !size
) {
213 len
= security_inode_getsecurity(inode
, name
, &buffer
, false);
217 len
= security_inode_getsecurity(inode
, name
, &buffer
, true);
224 memcpy(value
, buffer
, len
);
226 security_release_secctx(buffer
, len
);
230 EXPORT_SYMBOL_GPL(xattr_getsecurity
);
233 * vfs_getxattr_alloc - allocate memory, if necessary, before calling getxattr
235 * Allocate memory, if not already allocated, or re-allocate correct size,
236 * before retrieving the extended attribute.
238 * Returns the result of alloc, if failed, or the getxattr operation.
241 vfs_getxattr_alloc(struct dentry
*dentry
, const char *name
, char **xattr_value
,
242 size_t xattr_size
, gfp_t flags
)
244 struct inode
*inode
= dentry
->d_inode
;
245 char *value
= *xattr_value
;
248 error
= xattr_permission(inode
, name
, MAY_READ
);
252 if (!inode
->i_op
->getxattr
)
255 error
= inode
->i_op
->getxattr(dentry
, inode
, name
, NULL
, 0);
259 if (!value
|| (error
> xattr_size
)) {
260 value
= krealloc(*xattr_value
, error
+ 1, flags
);
263 memset(value
, 0, error
+ 1);
266 error
= inode
->i_op
->getxattr(dentry
, inode
, name
, value
, error
);
267 *xattr_value
= value
;
272 vfs_getxattr(struct dentry
*dentry
, const char *name
, void *value
, size_t size
)
274 struct inode
*inode
= dentry
->d_inode
;
277 error
= xattr_permission(inode
, name
, MAY_READ
);
281 error
= security_inode_getxattr(dentry
, name
);
285 if (!strncmp(name
, XATTR_SECURITY_PREFIX
,
286 XATTR_SECURITY_PREFIX_LEN
)) {
287 const char *suffix
= name
+ XATTR_SECURITY_PREFIX_LEN
;
288 int ret
= xattr_getsecurity(inode
, suffix
, value
, size
);
290 * Only overwrite the return value if a security module
291 * is actually active.
293 if (ret
== -EOPNOTSUPP
)
298 if (inode
->i_op
->getxattr
)
299 error
= inode
->i_op
->getxattr(dentry
, inode
, name
, value
, size
);
306 EXPORT_SYMBOL_GPL(vfs_getxattr
);
309 vfs_listxattr(struct dentry
*d
, char *list
, size_t size
)
313 error
= security_inode_listxattr(d
);
317 if (d
->d_inode
->i_op
->listxattr
) {
318 error
= d
->d_inode
->i_op
->listxattr(d
, list
, size
);
320 error
= security_inode_listsecurity(d
->d_inode
, list
, size
);
321 if (size
&& error
> size
)
326 EXPORT_SYMBOL_GPL(vfs_listxattr
);
329 vfs_removexattr(struct dentry
*dentry
, const char *name
)
331 struct inode
*inode
= dentry
->d_inode
;
334 if (!inode
->i_op
->removexattr
)
337 error
= xattr_permission(inode
, name
, MAY_WRITE
);
342 error
= security_inode_removexattr(dentry
, name
);
346 error
= inode
->i_op
->removexattr(dentry
, name
);
349 fsnotify_xattr(dentry
);
350 evm_inode_post_removexattr(dentry
, name
);
357 EXPORT_SYMBOL_GPL(vfs_removexattr
);
361 * Extended attribute SET operations
364 setxattr(struct dentry
*d
, const char __user
*name
, const void __user
*value
,
365 size_t size
, int flags
)
369 char kname
[XATTR_NAME_MAX
+ 1];
371 if (flags
& ~(XATTR_CREATE
|XATTR_REPLACE
))
374 error
= strncpy_from_user(kname
, name
, sizeof(kname
));
375 if (error
== 0 || error
== sizeof(kname
))
381 if (size
> XATTR_SIZE_MAX
)
383 kvalue
= kmalloc(size
, GFP_KERNEL
| __GFP_NOWARN
);
385 kvalue
= vmalloc(size
);
389 if (copy_from_user(kvalue
, value
, size
)) {
393 if ((strcmp(kname
, XATTR_NAME_POSIX_ACL_ACCESS
) == 0) ||
394 (strcmp(kname
, XATTR_NAME_POSIX_ACL_DEFAULT
) == 0))
395 posix_acl_fix_xattr_from_user(kvalue
, size
);
398 error
= vfs_setxattr(d
, kname
, kvalue
, size
, flags
);
405 static int path_setxattr(const char __user
*pathname
,
406 const char __user
*name
, const void __user
*value
,
407 size_t size
, int flags
, unsigned int lookup_flags
)
412 error
= user_path_at(AT_FDCWD
, pathname
, lookup_flags
, &path
);
415 error
= mnt_want_write(path
.mnt
);
417 error
= setxattr(path
.dentry
, name
, value
, size
, flags
);
418 mnt_drop_write(path
.mnt
);
421 if (retry_estale(error
, lookup_flags
)) {
422 lookup_flags
|= LOOKUP_REVAL
;
428 SYSCALL_DEFINE5(setxattr
, const char __user
*, pathname
,
429 const char __user
*, name
, const void __user
*, value
,
430 size_t, size
, int, flags
)
432 return path_setxattr(pathname
, name
, value
, size
, flags
, LOOKUP_FOLLOW
);
435 SYSCALL_DEFINE5(lsetxattr
, const char __user
*, pathname
,
436 const char __user
*, name
, const void __user
*, value
,
437 size_t, size
, int, flags
)
439 return path_setxattr(pathname
, name
, value
, size
, flags
, 0);
442 SYSCALL_DEFINE5(fsetxattr
, int, fd
, const char __user
*, name
,
443 const void __user
*,value
, size_t, size
, int, flags
)
445 struct fd f
= fdget(fd
);
451 error
= mnt_want_write_file(f
.file
);
453 error
= setxattr(f
.file
->f_path
.dentry
, name
, value
, size
, flags
);
454 mnt_drop_write_file(f
.file
);
461 * Extended attribute GET operations
464 getxattr(struct dentry
*d
, const char __user
*name
, void __user
*value
,
469 char kname
[XATTR_NAME_MAX
+ 1];
471 error
= strncpy_from_user(kname
, name
, sizeof(kname
));
472 if (error
== 0 || error
== sizeof(kname
))
478 if (size
> XATTR_SIZE_MAX
)
479 size
= XATTR_SIZE_MAX
;
480 kvalue
= kzalloc(size
, GFP_KERNEL
| __GFP_NOWARN
);
482 kvalue
= vmalloc(size
);
488 error
= vfs_getxattr(d
, kname
, kvalue
, size
);
490 if ((strcmp(kname
, XATTR_NAME_POSIX_ACL_ACCESS
) == 0) ||
491 (strcmp(kname
, XATTR_NAME_POSIX_ACL_DEFAULT
) == 0))
492 posix_acl_fix_xattr_to_user(kvalue
, size
);
493 if (size
&& copy_to_user(value
, kvalue
, error
))
495 } else if (error
== -ERANGE
&& size
>= XATTR_SIZE_MAX
) {
496 /* The file system tried to returned a value bigger
497 than XATTR_SIZE_MAX bytes. Not possible. */
506 static ssize_t
path_getxattr(const char __user
*pathname
,
507 const char __user
*name
, void __user
*value
,
508 size_t size
, unsigned int lookup_flags
)
513 error
= user_path_at(AT_FDCWD
, pathname
, lookup_flags
, &path
);
516 error
= getxattr(path
.dentry
, name
, value
, size
);
518 if (retry_estale(error
, lookup_flags
)) {
519 lookup_flags
|= LOOKUP_REVAL
;
525 SYSCALL_DEFINE4(getxattr
, const char __user
*, pathname
,
526 const char __user
*, name
, void __user
*, value
, size_t, size
)
528 return path_getxattr(pathname
, name
, value
, size
, LOOKUP_FOLLOW
);
531 SYSCALL_DEFINE4(lgetxattr
, const char __user
*, pathname
,
532 const char __user
*, name
, void __user
*, value
, size_t, size
)
534 return path_getxattr(pathname
, name
, value
, size
, 0);
537 SYSCALL_DEFINE4(fgetxattr
, int, fd
, const char __user
*, name
,
538 void __user
*, value
, size_t, size
)
540 struct fd f
= fdget(fd
);
541 ssize_t error
= -EBADF
;
546 error
= getxattr(f
.file
->f_path
.dentry
, name
, value
, size
);
552 * Extended attribute LIST operations
555 listxattr(struct dentry
*d
, char __user
*list
, size_t size
)
561 if (size
> XATTR_LIST_MAX
)
562 size
= XATTR_LIST_MAX
;
563 klist
= kmalloc(size
, __GFP_NOWARN
| GFP_KERNEL
);
565 klist
= vmalloc(size
);
571 error
= vfs_listxattr(d
, klist
, size
);
573 if (size
&& copy_to_user(list
, klist
, error
))
575 } else if (error
== -ERANGE
&& size
>= XATTR_LIST_MAX
) {
576 /* The file system tried to returned a list bigger
577 than XATTR_LIST_MAX bytes. Not possible. */
586 static ssize_t
path_listxattr(const char __user
*pathname
, char __user
*list
,
587 size_t size
, unsigned int lookup_flags
)
592 error
= user_path_at(AT_FDCWD
, pathname
, lookup_flags
, &path
);
595 error
= listxattr(path
.dentry
, list
, size
);
597 if (retry_estale(error
, lookup_flags
)) {
598 lookup_flags
|= LOOKUP_REVAL
;
604 SYSCALL_DEFINE3(listxattr
, const char __user
*, pathname
, char __user
*, list
,
607 return path_listxattr(pathname
, list
, size
, LOOKUP_FOLLOW
);
610 SYSCALL_DEFINE3(llistxattr
, const char __user
*, pathname
, char __user
*, list
,
613 return path_listxattr(pathname
, list
, size
, 0);
616 SYSCALL_DEFINE3(flistxattr
, int, fd
, char __user
*, list
, size_t, size
)
618 struct fd f
= fdget(fd
);
619 ssize_t error
= -EBADF
;
624 error
= listxattr(f
.file
->f_path
.dentry
, list
, size
);
630 * Extended attribute REMOVE operations
633 removexattr(struct dentry
*d
, const char __user
*name
)
636 char kname
[XATTR_NAME_MAX
+ 1];
638 error
= strncpy_from_user(kname
, name
, sizeof(kname
));
639 if (error
== 0 || error
== sizeof(kname
))
644 return vfs_removexattr(d
, kname
);
647 static int path_removexattr(const char __user
*pathname
,
648 const char __user
*name
, unsigned int lookup_flags
)
653 error
= user_path_at(AT_FDCWD
, pathname
, lookup_flags
, &path
);
656 error
= mnt_want_write(path
.mnt
);
658 error
= removexattr(path
.dentry
, name
);
659 mnt_drop_write(path
.mnt
);
662 if (retry_estale(error
, lookup_flags
)) {
663 lookup_flags
|= LOOKUP_REVAL
;
669 SYSCALL_DEFINE2(removexattr
, const char __user
*, pathname
,
670 const char __user
*, name
)
672 return path_removexattr(pathname
, name
, LOOKUP_FOLLOW
);
675 SYSCALL_DEFINE2(lremovexattr
, const char __user
*, pathname
,
676 const char __user
*, name
)
678 return path_removexattr(pathname
, name
, 0);
681 SYSCALL_DEFINE2(fremovexattr
, int, fd
, const char __user
*, name
)
683 struct fd f
= fdget(fd
);
689 error
= mnt_want_write_file(f
.file
);
691 error
= removexattr(f
.file
->f_path
.dentry
, name
);
692 mnt_drop_write_file(f
.file
);
699 * Find the handler for the prefix and dispatch its get() operation.
702 generic_getxattr(struct dentry
*dentry
, struct inode
*inode
,
703 const char *name
, void *buffer
, size_t size
)
705 const struct xattr_handler
*handler
;
707 handler
= xattr_resolve_name(inode
, &name
);
709 return PTR_ERR(handler
);
710 return handler
->get(handler
, dentry
, inode
,
715 * Combine the results of the list() operation from every xattr_handler in the
719 generic_listxattr(struct dentry
*dentry
, char *buffer
, size_t buffer_size
)
721 const struct xattr_handler
*handler
, **handlers
= dentry
->d_sb
->s_xattr
;
722 unsigned int size
= 0;
725 for_each_xattr_handler(handlers
, handler
) {
726 if (!handler
->name
||
727 (handler
->list
&& !handler
->list(dentry
)))
729 size
+= strlen(handler
->name
) + 1;
735 for_each_xattr_handler(handlers
, handler
) {
736 if (!handler
->name
||
737 (handler
->list
&& !handler
->list(dentry
)))
739 len
= strlen(handler
->name
);
740 if (len
+ 1 > buffer_size
)
742 memcpy(buf
, handler
->name
, len
+ 1);
744 buffer_size
-= len
+ 1;
752 * Find the handler for the prefix and dispatch its set() operation.
755 generic_setxattr(struct dentry
*dentry
, struct inode
*inode
, const char *name
,
756 const void *value
, size_t size
, int flags
)
758 const struct xattr_handler
*handler
;
761 value
= ""; /* empty EA, do not remove */
762 handler
= xattr_resolve_name(inode
, &name
);
764 return PTR_ERR(handler
);
765 return handler
->set(handler
, dentry
, inode
, name
, value
, size
, flags
);
769 * Find the handler for the prefix and dispatch its set() operation to remove
770 * any associated extended attribute.
773 generic_removexattr(struct dentry
*dentry
, const char *name
)
775 const struct xattr_handler
*handler
;
777 handler
= xattr_resolve_name(d_inode(dentry
), &name
);
779 return PTR_ERR(handler
);
780 return handler
->set(handler
, dentry
, d_inode(dentry
), name
, NULL
,
784 EXPORT_SYMBOL(generic_getxattr
);
785 EXPORT_SYMBOL(generic_listxattr
);
786 EXPORT_SYMBOL(generic_setxattr
);
787 EXPORT_SYMBOL(generic_removexattr
);
790 * xattr_full_name - Compute full attribute name from suffix
792 * @handler: handler of the xattr_handler operation
793 * @name: name passed to the xattr_handler operation
795 * The get and set xattr handler operations are called with the remainder of
796 * the attribute name after skipping the handler's prefix: for example, "foo"
797 * is passed to the get operation of a handler with prefix "user." to get
798 * attribute "user.foo". The full name is still "there" in the name though.
800 * Note: the list xattr handler operation when called from the vfs is passed a
801 * NULL name; some file systems use this operation internally, with varying
804 const char *xattr_full_name(const struct xattr_handler
*handler
,
807 size_t prefix_len
= strlen(xattr_prefix(handler
));
809 return name
- prefix_len
;
811 EXPORT_SYMBOL(xattr_full_name
);
814 * Allocate new xattr and copy in the value; but leave the name to callers.
816 struct simple_xattr
*simple_xattr_alloc(const void *value
, size_t size
)
818 struct simple_xattr
*new_xattr
;
822 len
= sizeof(*new_xattr
) + size
;
823 if (len
< sizeof(*new_xattr
))
826 new_xattr
= kmalloc(len
, GFP_KERNEL
);
830 new_xattr
->size
= size
;
831 memcpy(new_xattr
->value
, value
, size
);
836 * xattr GET operation for in-memory/pseudo filesystems
838 int simple_xattr_get(struct simple_xattrs
*xattrs
, const char *name
,
839 void *buffer
, size_t size
)
841 struct simple_xattr
*xattr
;
844 spin_lock(&xattrs
->lock
);
845 list_for_each_entry(xattr
, &xattrs
->head
, list
) {
846 if (strcmp(name
, xattr
->name
))
851 if (size
< xattr
->size
)
854 memcpy(buffer
, xattr
->value
, xattr
->size
);
858 spin_unlock(&xattrs
->lock
);
863 * simple_xattr_set - xattr SET operation for in-memory/pseudo filesystems
864 * @xattrs: target simple_xattr list
865 * @name: name of the extended attribute
866 * @value: value of the xattr. If %NULL, will remove the attribute.
867 * @size: size of the new xattr
868 * @flags: %XATTR_{CREATE|REPLACE}
870 * %XATTR_CREATE is set, the xattr shouldn't exist already; otherwise fails
871 * with -EEXIST. If %XATTR_REPLACE is set, the xattr should exist;
872 * otherwise, fails with -ENODATA.
874 * Returns 0 on success, -errno on failure.
876 int simple_xattr_set(struct simple_xattrs
*xattrs
, const char *name
,
877 const void *value
, size_t size
, int flags
)
879 struct simple_xattr
*xattr
;
880 struct simple_xattr
*new_xattr
= NULL
;
883 /* value == NULL means remove */
885 new_xattr
= simple_xattr_alloc(value
, size
);
889 new_xattr
->name
= kstrdup(name
, GFP_KERNEL
);
890 if (!new_xattr
->name
) {
896 spin_lock(&xattrs
->lock
);
897 list_for_each_entry(xattr
, &xattrs
->head
, list
) {
898 if (!strcmp(name
, xattr
->name
)) {
899 if (flags
& XATTR_CREATE
) {
902 } else if (new_xattr
) {
903 list_replace(&xattr
->list
, &new_xattr
->list
);
905 list_del(&xattr
->list
);
910 if (flags
& XATTR_REPLACE
) {
914 list_add(&new_xattr
->list
, &xattrs
->head
);
918 spin_unlock(&xattrs
->lock
);
927 static bool xattr_is_trusted(const char *name
)
929 return !strncmp(name
, XATTR_TRUSTED_PREFIX
, XATTR_TRUSTED_PREFIX_LEN
);
932 static int xattr_list_one(char **buffer
, ssize_t
*remaining_size
,
935 size_t len
= strlen(name
) + 1;
937 if (*remaining_size
< len
)
939 memcpy(*buffer
, name
, len
);
942 *remaining_size
-= len
;
947 * xattr LIST operation for in-memory/pseudo filesystems
949 ssize_t
simple_xattr_list(struct inode
*inode
, struct simple_xattrs
*xattrs
,
950 char *buffer
, size_t size
)
952 bool trusted
= capable(CAP_SYS_ADMIN
);
953 struct simple_xattr
*xattr
;
954 ssize_t remaining_size
= size
;
957 #ifdef CONFIG_FS_POSIX_ACL
959 err
= xattr_list_one(&buffer
, &remaining_size
,
960 XATTR_NAME_POSIX_ACL_ACCESS
);
964 if (inode
->i_default_acl
) {
965 err
= xattr_list_one(&buffer
, &remaining_size
,
966 XATTR_NAME_POSIX_ACL_DEFAULT
);
972 spin_lock(&xattrs
->lock
);
973 list_for_each_entry(xattr
, &xattrs
->head
, list
) {
974 /* skip "trusted." attributes for unprivileged callers */
975 if (!trusted
&& xattr_is_trusted(xattr
->name
))
978 err
= xattr_list_one(&buffer
, &remaining_size
, xattr
->name
);
982 spin_unlock(&xattrs
->lock
);
984 return err
? err
: size
- remaining_size
;
988 * Adds an extended attribute to the list
990 void simple_xattr_list_add(struct simple_xattrs
*xattrs
,
991 struct simple_xattr
*new_xattr
)
993 spin_lock(&xattrs
->lock
);
994 list_add(&new_xattr
->list
, &xattrs
->head
);
995 spin_unlock(&xattrs
->lock
);