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 <linux/uaccess.h>
29 strcmp_prefix(const char *a
, const char *a_prefix
)
31 while (*a_prefix
&& *a
== *a_prefix
) {
35 return *a_prefix
? NULL
: a
;
39 * In order to implement different sets of xattr operations for each xattr
40 * prefix, a filesystem should create a null-terminated array of struct
41 * xattr_handler (one for each prefix) and hang a pointer to it off of the
42 * s_xattr field of the superblock.
44 #define for_each_xattr_handler(handlers, handler) \
46 for ((handler) = *(handlers)++; \
48 (handler) = *(handlers)++)
51 * Find the xattr_handler with the matching prefix.
53 static const struct xattr_handler
*
54 xattr_resolve_name(struct inode
*inode
, const char **name
)
56 const struct xattr_handler
**handlers
= inode
->i_sb
->s_xattr
;
57 const struct xattr_handler
*handler
;
59 if (!(inode
->i_opflags
& IOP_XATTR
)) {
60 if (unlikely(is_bad_inode(inode
)))
62 return ERR_PTR(-EOPNOTSUPP
);
64 for_each_xattr_handler(handlers
, handler
) {
67 n
= strcmp_prefix(*name
, xattr_prefix(handler
));
69 if (!handler
->prefix
^ !*n
) {
72 return ERR_PTR(-EINVAL
);
78 return ERR_PTR(-EOPNOTSUPP
);
82 * Check permissions for extended attribute access. This is a bit complicated
83 * because different namespaces have very different rules.
86 xattr_permission(struct inode
*inode
, const char *name
, int mask
)
89 * We can never set or remove an extended attribute on a read-only
90 * filesystem or on an immutable / append-only inode.
92 if (mask
& MAY_WRITE
) {
93 if (IS_IMMUTABLE(inode
) || IS_APPEND(inode
))
96 * Updating an xattr will likely cause i_uid and i_gid
97 * to be writen back improperly if their true value is
100 if (HAS_UNMAPPED_ID(inode
))
105 * No restriction for security.* and system.* from the VFS. Decision
106 * on these is left to the underlying filesystem / security module.
108 if (!strncmp(name
, XATTR_SECURITY_PREFIX
, XATTR_SECURITY_PREFIX_LEN
) ||
109 !strncmp(name
, XATTR_SYSTEM_PREFIX
, XATTR_SYSTEM_PREFIX_LEN
))
113 * The trusted.* namespace can only be accessed by privileged users.
115 if (!strncmp(name
, XATTR_TRUSTED_PREFIX
, XATTR_TRUSTED_PREFIX_LEN
)) {
116 if (!capable(CAP_SYS_ADMIN
))
117 return (mask
& MAY_WRITE
) ? -EPERM
: -ENODATA
;
122 * In the user.* namespace, only regular files and directories can have
123 * extended attributes. For sticky directories, only the owner and
124 * privileged users can write attributes.
126 if (!strncmp(name
, XATTR_USER_PREFIX
, XATTR_USER_PREFIX_LEN
)) {
127 if (!S_ISREG(inode
->i_mode
) && !S_ISDIR(inode
->i_mode
))
128 return (mask
& MAY_WRITE
) ? -EPERM
: -ENODATA
;
129 if (S_ISDIR(inode
->i_mode
) && (inode
->i_mode
& S_ISVTX
) &&
130 (mask
& MAY_WRITE
) && !inode_owner_or_capable(inode
))
134 return inode_permission(inode
, mask
);
138 __vfs_setxattr(struct dentry
*dentry
, struct inode
*inode
, const char *name
,
139 const void *value
, size_t size
, int flags
)
141 const struct xattr_handler
*handler
;
143 handler
= xattr_resolve_name(inode
, &name
);
145 return PTR_ERR(handler
);
149 value
= ""; /* empty EA, do not remove */
150 return handler
->set(handler
, dentry
, inode
, name
, value
, size
, flags
);
152 EXPORT_SYMBOL(__vfs_setxattr
);
155 * __vfs_setxattr_noperm - perform setxattr operation without performing
158 * @dentry - object to perform setxattr on
159 * @name - xattr name to set
160 * @value - value to set @name to
161 * @size - size of @value
162 * @flags - flags to pass into filesystem operations
164 * returns the result of the internal setxattr or setsecurity operations.
166 * This function requires the caller to lock the inode's i_mutex before it
167 * is executed. It also assumes that the caller will make the appropriate
170 int __vfs_setxattr_noperm(struct dentry
*dentry
, const char *name
,
171 const void *value
, size_t size
, int flags
)
173 struct inode
*inode
= dentry
->d_inode
;
175 int issec
= !strncmp(name
, XATTR_SECURITY_PREFIX
,
176 XATTR_SECURITY_PREFIX_LEN
);
179 inode
->i_flags
&= ~S_NOSEC
;
180 if (inode
->i_opflags
& IOP_XATTR
) {
181 error
= __vfs_setxattr(dentry
, inode
, name
, value
, size
, flags
);
183 fsnotify_xattr(dentry
);
184 security_inode_post_setxattr(dentry
, name
, value
,
188 if (unlikely(is_bad_inode(inode
)))
191 if (error
== -EAGAIN
) {
195 const char *suffix
= name
+ XATTR_SECURITY_PREFIX_LEN
;
197 error
= security_inode_setsecurity(inode
, suffix
, value
,
200 fsnotify_xattr(dentry
);
206 EXPORT_SYMBOL_GPL(__vfs_setxattr_noperm
);
210 vfs_setxattr(struct dentry
*dentry
, const char *name
, const void *value
,
211 size_t size
, int flags
)
213 struct inode
*inode
= dentry
->d_inode
;
216 error
= xattr_permission(inode
, name
, MAY_WRITE
);
221 error
= security_inode_setxattr(dentry
, name
, value
, size
, flags
);
225 error
= __vfs_setxattr_noperm(dentry
, name
, value
, size
, flags
);
231 EXPORT_SYMBOL_GPL(vfs_setxattr
);
234 xattr_getsecurity(struct inode
*inode
, const char *name
, void *value
,
240 if (!value
|| !size
) {
241 len
= security_inode_getsecurity(inode
, name
, &buffer
, false);
245 len
= security_inode_getsecurity(inode
, name
, &buffer
, true);
252 memcpy(value
, buffer
, len
);
258 EXPORT_SYMBOL_GPL(xattr_getsecurity
);
261 * vfs_getxattr_alloc - allocate memory, if necessary, before calling getxattr
263 * Allocate memory, if not already allocated, or re-allocate correct size,
264 * before retrieving the extended attribute.
266 * Returns the result of alloc, if failed, or the getxattr operation.
269 vfs_getxattr_alloc(struct dentry
*dentry
, const char *name
, char **xattr_value
,
270 size_t xattr_size
, gfp_t flags
)
272 const struct xattr_handler
*handler
;
273 struct inode
*inode
= dentry
->d_inode
;
274 char *value
= *xattr_value
;
277 error
= xattr_permission(inode
, name
, MAY_READ
);
281 handler
= xattr_resolve_name(inode
, &name
);
283 return PTR_ERR(handler
);
286 error
= handler
->get(handler
, dentry
, inode
, name
, NULL
, 0);
290 if (!value
|| (error
> xattr_size
)) {
291 value
= krealloc(*xattr_value
, error
+ 1, flags
);
294 memset(value
, 0, error
+ 1);
297 error
= handler
->get(handler
, dentry
, inode
, name
, value
, error
);
298 *xattr_value
= value
;
303 __vfs_getxattr(struct dentry
*dentry
, struct inode
*inode
, const char *name
,
304 void *value
, size_t size
)
306 const struct xattr_handler
*handler
;
308 handler
= xattr_resolve_name(inode
, &name
);
310 return PTR_ERR(handler
);
313 return handler
->get(handler
, dentry
, inode
, name
, value
, size
);
315 EXPORT_SYMBOL(__vfs_getxattr
);
318 vfs_getxattr(struct dentry
*dentry
, const char *name
, void *value
, size_t size
)
320 struct inode
*inode
= dentry
->d_inode
;
323 error
= xattr_permission(inode
, name
, MAY_READ
);
327 error
= security_inode_getxattr(dentry
, name
);
331 if (!strncmp(name
, XATTR_SECURITY_PREFIX
,
332 XATTR_SECURITY_PREFIX_LEN
)) {
333 const char *suffix
= name
+ XATTR_SECURITY_PREFIX_LEN
;
334 int ret
= xattr_getsecurity(inode
, suffix
, value
, size
);
336 * Only overwrite the return value if a security module
337 * is actually active.
339 if (ret
== -EOPNOTSUPP
)
344 return __vfs_getxattr(dentry
, inode
, name
, value
, size
);
346 EXPORT_SYMBOL_GPL(vfs_getxattr
);
349 vfs_listxattr(struct dentry
*dentry
, char *list
, size_t size
)
351 struct inode
*inode
= d_inode(dentry
);
354 error
= security_inode_listxattr(dentry
);
357 if (inode
->i_op
->listxattr
&& (inode
->i_opflags
& IOP_XATTR
)) {
359 error
= inode
->i_op
->listxattr(dentry
, list
, size
);
361 error
= security_inode_listsecurity(inode
, list
, size
);
362 if (size
&& error
> size
)
367 EXPORT_SYMBOL_GPL(vfs_listxattr
);
370 __vfs_removexattr(struct dentry
*dentry
, const char *name
)
372 struct inode
*inode
= d_inode(dentry
);
373 const struct xattr_handler
*handler
;
375 handler
= xattr_resolve_name(inode
, &name
);
377 return PTR_ERR(handler
);
380 return handler
->set(handler
, dentry
, inode
, name
, NULL
, 0, XATTR_REPLACE
);
382 EXPORT_SYMBOL(__vfs_removexattr
);
385 * __vfs_removexattr_noperm - perform removexattr operation without
386 * performing permission checks.
388 * @dentry - object to perform setxattr on
389 * @name - xattr name to set
391 * returns the result of the internal setxattr or setsecurity operations.
393 * This function requires the caller to lock the inode's i_mutex before it
394 * is executed. It also assumes that the caller will make the appropriate
398 __vfs_removexattr_noperm(struct dentry
*dentry
, const char *name
)
402 error
=__vfs_removexattr(dentry
, name
);
404 fsnotify_xattr(dentry
);
405 evm_inode_post_removexattr(dentry
, name
);
409 EXPORT_SYMBOL_GPL(__vfs_removexattr_noperm
);
412 vfs_removexattr(struct dentry
*dentry
, const char *name
)
414 struct inode
*inode
= dentry
->d_inode
;
417 error
= xattr_permission(inode
, name
, MAY_WRITE
);
422 error
= security_inode_removexattr(dentry
, name
);
426 error
= __vfs_removexattr_noperm(dentry
, name
);
432 EXPORT_SYMBOL_GPL(vfs_removexattr
);
436 * Extended attribute SET operations
439 setxattr(struct dentry
*d
, const char __user
*name
, const void __user
*value
,
440 size_t size
, int flags
)
444 char kname
[XATTR_NAME_MAX
+ 1];
446 if (flags
& ~(XATTR_CREATE
|XATTR_REPLACE
))
449 error
= strncpy_from_user(kname
, name
, sizeof(kname
));
450 if (error
== 0 || error
== sizeof(kname
))
456 if (size
> XATTR_SIZE_MAX
)
458 kvalue
= kvmalloc(size
, GFP_KERNEL
);
461 if (copy_from_user(kvalue
, value
, size
)) {
465 if ((strcmp(kname
, XATTR_NAME_POSIX_ACL_ACCESS
) == 0) ||
466 (strcmp(kname
, XATTR_NAME_POSIX_ACL_DEFAULT
) == 0))
467 posix_acl_fix_xattr_from_user(kvalue
, size
);
468 else if (strcmp(kname
, XATTR_NAME_CAPS
) == 0) {
469 error
= cap_convert_nscap(d
, &kvalue
, size
);
476 error
= vfs_setxattr(d
, kname
, kvalue
, size
, flags
);
483 static int path_setxattr(const char __user
*pathname
,
484 const char __user
*name
, const void __user
*value
,
485 size_t size
, int flags
, unsigned int lookup_flags
)
490 error
= user_path_at(AT_FDCWD
, pathname
, lookup_flags
, &path
);
493 error
= mnt_want_write(path
.mnt
);
495 error
= setxattr(path
.dentry
, name
, value
, size
, flags
);
496 mnt_drop_write(path
.mnt
);
499 if (retry_estale(error
, lookup_flags
)) {
500 lookup_flags
|= LOOKUP_REVAL
;
506 SYSCALL_DEFINE5(setxattr
, const char __user
*, pathname
,
507 const char __user
*, name
, const void __user
*, value
,
508 size_t, size
, int, flags
)
510 return path_setxattr(pathname
, name
, value
, size
, flags
, LOOKUP_FOLLOW
);
513 SYSCALL_DEFINE5(lsetxattr
, const char __user
*, pathname
,
514 const char __user
*, name
, const void __user
*, value
,
515 size_t, size
, int, flags
)
517 return path_setxattr(pathname
, name
, value
, size
, flags
, 0);
520 SYSCALL_DEFINE5(fsetxattr
, int, fd
, const char __user
*, name
,
521 const void __user
*,value
, size_t, size
, int, flags
)
523 struct fd f
= fdget(fd
);
529 error
= mnt_want_write_file_path(f
.file
);
531 error
= setxattr(f
.file
->f_path
.dentry
, name
, value
, size
, flags
);
532 mnt_drop_write_file_path(f
.file
);
539 * Extended attribute GET operations
542 getxattr(struct dentry
*d
, const char __user
*name
, void __user
*value
,
547 char kname
[XATTR_NAME_MAX
+ 1];
549 error
= strncpy_from_user(kname
, name
, sizeof(kname
));
550 if (error
== 0 || error
== sizeof(kname
))
556 if (size
> XATTR_SIZE_MAX
)
557 size
= XATTR_SIZE_MAX
;
558 kvalue
= kvzalloc(size
, GFP_KERNEL
);
563 error
= vfs_getxattr(d
, kname
, kvalue
, size
);
565 if ((strcmp(kname
, XATTR_NAME_POSIX_ACL_ACCESS
) == 0) ||
566 (strcmp(kname
, XATTR_NAME_POSIX_ACL_DEFAULT
) == 0))
567 posix_acl_fix_xattr_to_user(kvalue
, size
);
568 if (size
&& copy_to_user(value
, kvalue
, error
))
570 } else if (error
== -ERANGE
&& size
>= XATTR_SIZE_MAX
) {
571 /* The file system tried to returned a value bigger
572 than XATTR_SIZE_MAX bytes. Not possible. */
581 static ssize_t
path_getxattr(const char __user
*pathname
,
582 const char __user
*name
, void __user
*value
,
583 size_t size
, unsigned int lookup_flags
)
588 error
= user_path_at(AT_FDCWD
, pathname
, lookup_flags
, &path
);
591 error
= getxattr(path
.dentry
, name
, value
, size
);
593 if (retry_estale(error
, lookup_flags
)) {
594 lookup_flags
|= LOOKUP_REVAL
;
600 SYSCALL_DEFINE4(getxattr
, const char __user
*, pathname
,
601 const char __user
*, name
, void __user
*, value
, size_t, size
)
603 return path_getxattr(pathname
, name
, value
, size
, LOOKUP_FOLLOW
);
606 SYSCALL_DEFINE4(lgetxattr
, const char __user
*, pathname
,
607 const char __user
*, name
, void __user
*, value
, size_t, size
)
609 return path_getxattr(pathname
, name
, value
, size
, 0);
612 SYSCALL_DEFINE4(fgetxattr
, int, fd
, const char __user
*, name
,
613 void __user
*, value
, size_t, size
)
615 struct fd f
= fdget(fd
);
616 ssize_t error
= -EBADF
;
621 error
= getxattr(f
.file
->f_path
.dentry
, name
, value
, size
);
627 * Extended attribute LIST operations
630 listxattr(struct dentry
*d
, char __user
*list
, size_t size
)
636 if (size
> XATTR_LIST_MAX
)
637 size
= XATTR_LIST_MAX
;
638 klist
= kvmalloc(size
, GFP_KERNEL
);
643 error
= vfs_listxattr(d
, klist
, size
);
645 if (size
&& copy_to_user(list
, klist
, error
))
647 } else if (error
== -ERANGE
&& size
>= XATTR_LIST_MAX
) {
648 /* The file system tried to returned a list bigger
649 than XATTR_LIST_MAX bytes. Not possible. */
658 static ssize_t
path_listxattr(const char __user
*pathname
, char __user
*list
,
659 size_t size
, unsigned int lookup_flags
)
664 error
= user_path_at(AT_FDCWD
, pathname
, lookup_flags
, &path
);
667 error
= listxattr(path
.dentry
, list
, size
);
669 if (retry_estale(error
, lookup_flags
)) {
670 lookup_flags
|= LOOKUP_REVAL
;
676 SYSCALL_DEFINE3(listxattr
, const char __user
*, pathname
, char __user
*, list
,
679 return path_listxattr(pathname
, list
, size
, LOOKUP_FOLLOW
);
682 SYSCALL_DEFINE3(llistxattr
, const char __user
*, pathname
, char __user
*, list
,
685 return path_listxattr(pathname
, list
, size
, 0);
688 SYSCALL_DEFINE3(flistxattr
, int, fd
, char __user
*, list
, size_t, size
)
690 struct fd f
= fdget(fd
);
691 ssize_t error
= -EBADF
;
696 error
= listxattr(f
.file
->f_path
.dentry
, list
, size
);
702 * Extended attribute REMOVE operations
705 removexattr(struct dentry
*d
, const char __user
*name
)
708 char kname
[XATTR_NAME_MAX
+ 1];
710 error
= strncpy_from_user(kname
, name
, sizeof(kname
));
711 if (error
== 0 || error
== sizeof(kname
))
716 return vfs_removexattr(d
, kname
);
719 static int path_removexattr(const char __user
*pathname
,
720 const char __user
*name
, unsigned int lookup_flags
)
725 error
= user_path_at(AT_FDCWD
, pathname
, lookup_flags
, &path
);
728 error
= mnt_want_write(path
.mnt
);
730 error
= removexattr(path
.dentry
, name
);
731 mnt_drop_write(path
.mnt
);
734 if (retry_estale(error
, lookup_flags
)) {
735 lookup_flags
|= LOOKUP_REVAL
;
741 SYSCALL_DEFINE2(removexattr
, const char __user
*, pathname
,
742 const char __user
*, name
)
744 return path_removexattr(pathname
, name
, LOOKUP_FOLLOW
);
747 SYSCALL_DEFINE2(lremovexattr
, const char __user
*, pathname
,
748 const char __user
*, name
)
750 return path_removexattr(pathname
, name
, 0);
753 SYSCALL_DEFINE2(fremovexattr
, int, fd
, const char __user
*, name
)
755 struct fd f
= fdget(fd
);
761 error
= mnt_want_write_file_path(f
.file
);
763 error
= removexattr(f
.file
->f_path
.dentry
, name
);
764 mnt_drop_write_file_path(f
.file
);
771 * Combine the results of the list() operation from every xattr_handler in the
775 generic_listxattr(struct dentry
*dentry
, char *buffer
, size_t buffer_size
)
777 const struct xattr_handler
*handler
, **handlers
= dentry
->d_sb
->s_xattr
;
778 unsigned int size
= 0;
781 for_each_xattr_handler(handlers
, handler
) {
782 if (!handler
->name
||
783 (handler
->list
&& !handler
->list(dentry
)))
785 size
+= strlen(handler
->name
) + 1;
791 for_each_xattr_handler(handlers
, handler
) {
792 if (!handler
->name
||
793 (handler
->list
&& !handler
->list(dentry
)))
795 len
= strlen(handler
->name
);
796 if (len
+ 1 > buffer_size
)
798 memcpy(buf
, handler
->name
, len
+ 1);
800 buffer_size
-= len
+ 1;
806 EXPORT_SYMBOL(generic_listxattr
);
809 * xattr_full_name - Compute full attribute name from suffix
811 * @handler: handler of the xattr_handler operation
812 * @name: name passed to the xattr_handler operation
814 * The get and set xattr handler operations are called with the remainder of
815 * the attribute name after skipping the handler's prefix: for example, "foo"
816 * is passed to the get operation of a handler with prefix "user." to get
817 * attribute "user.foo". The full name is still "there" in the name though.
819 * Note: the list xattr handler operation when called from the vfs is passed a
820 * NULL name; some file systems use this operation internally, with varying
823 const char *xattr_full_name(const struct xattr_handler
*handler
,
826 size_t prefix_len
= strlen(xattr_prefix(handler
));
828 return name
- prefix_len
;
830 EXPORT_SYMBOL(xattr_full_name
);
833 * Allocate new xattr and copy in the value; but leave the name to callers.
835 struct simple_xattr
*simple_xattr_alloc(const void *value
, size_t size
)
837 struct simple_xattr
*new_xattr
;
841 len
= sizeof(*new_xattr
) + size
;
842 if (len
< sizeof(*new_xattr
))
845 new_xattr
= kmalloc(len
, GFP_KERNEL
);
849 new_xattr
->size
= size
;
850 memcpy(new_xattr
->value
, value
, size
);
855 * xattr GET operation for in-memory/pseudo filesystems
857 int simple_xattr_get(struct simple_xattrs
*xattrs
, const char *name
,
858 void *buffer
, size_t size
)
860 struct simple_xattr
*xattr
;
863 spin_lock(&xattrs
->lock
);
864 list_for_each_entry(xattr
, &xattrs
->head
, list
) {
865 if (strcmp(name
, xattr
->name
))
870 if (size
< xattr
->size
)
873 memcpy(buffer
, xattr
->value
, xattr
->size
);
877 spin_unlock(&xattrs
->lock
);
882 * simple_xattr_set - xattr SET operation for in-memory/pseudo filesystems
883 * @xattrs: target simple_xattr list
884 * @name: name of the extended attribute
885 * @value: value of the xattr. If %NULL, will remove the attribute.
886 * @size: size of the new xattr
887 * @flags: %XATTR_{CREATE|REPLACE}
889 * %XATTR_CREATE is set, the xattr shouldn't exist already; otherwise fails
890 * with -EEXIST. If %XATTR_REPLACE is set, the xattr should exist;
891 * otherwise, fails with -ENODATA.
893 * Returns 0 on success, -errno on failure.
895 int simple_xattr_set(struct simple_xattrs
*xattrs
, const char *name
,
896 const void *value
, size_t size
, int flags
)
898 struct simple_xattr
*xattr
;
899 struct simple_xattr
*new_xattr
= NULL
;
902 /* value == NULL means remove */
904 new_xattr
= simple_xattr_alloc(value
, size
);
908 new_xattr
->name
= kstrdup(name
, GFP_KERNEL
);
909 if (!new_xattr
->name
) {
915 spin_lock(&xattrs
->lock
);
916 list_for_each_entry(xattr
, &xattrs
->head
, list
) {
917 if (!strcmp(name
, xattr
->name
)) {
918 if (flags
& XATTR_CREATE
) {
921 } else if (new_xattr
) {
922 list_replace(&xattr
->list
, &new_xattr
->list
);
924 list_del(&xattr
->list
);
929 if (flags
& XATTR_REPLACE
) {
933 list_add(&new_xattr
->list
, &xattrs
->head
);
937 spin_unlock(&xattrs
->lock
);
946 static bool xattr_is_trusted(const char *name
)
948 return !strncmp(name
, XATTR_TRUSTED_PREFIX
, XATTR_TRUSTED_PREFIX_LEN
);
951 static int xattr_list_one(char **buffer
, ssize_t
*remaining_size
,
954 size_t len
= strlen(name
) + 1;
956 if (*remaining_size
< len
)
958 memcpy(*buffer
, name
, len
);
961 *remaining_size
-= len
;
966 * xattr LIST operation for in-memory/pseudo filesystems
968 ssize_t
simple_xattr_list(struct inode
*inode
, struct simple_xattrs
*xattrs
,
969 char *buffer
, size_t size
)
971 bool trusted
= capable(CAP_SYS_ADMIN
);
972 struct simple_xattr
*xattr
;
973 ssize_t remaining_size
= size
;
976 #ifdef CONFIG_FS_POSIX_ACL
978 err
= xattr_list_one(&buffer
, &remaining_size
,
979 XATTR_NAME_POSIX_ACL_ACCESS
);
983 if (inode
->i_default_acl
) {
984 err
= xattr_list_one(&buffer
, &remaining_size
,
985 XATTR_NAME_POSIX_ACL_DEFAULT
);
991 spin_lock(&xattrs
->lock
);
992 list_for_each_entry(xattr
, &xattrs
->head
, list
) {
993 /* skip "trusted." attributes for unprivileged callers */
994 if (!trusted
&& xattr_is_trusted(xattr
->name
))
997 err
= xattr_list_one(&buffer
, &remaining_size
, xattr
->name
);
1001 spin_unlock(&xattrs
->lock
);
1003 return err
? err
: size
- remaining_size
;
1007 * Adds an extended attribute to the list
1009 void simple_xattr_list_add(struct simple_xattrs
*xattrs
,
1010 struct simple_xattr
*new_xattr
)
1012 spin_lock(&xattrs
->lock
);
1013 list_add(&new_xattr
->list
, &xattrs
->head
);
1014 spin_unlock(&xattrs
->lock
);