4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright (c) 2011, Lawrence Livermore National Security, LLC.
24 * Extended attributes (xattr) on Solaris are implemented as files
25 * which exist in a hidden xattr directory. These extended attributes
26 * can be accessed using the attropen() system call which opens
27 * the extended attribute. It can then be manipulated just like
28 * a standard file descriptor. This has a couple advantages such
29 * as practically no size limit on the file, and the extended
30 * attributes permissions may differ from those of the parent file.
31 * This interface is really quite clever, but it's also completely
32 * different than what is supported on Linux. It also comes with a
33 * steep performance penalty when accessing small xattrs because they
34 * are not stored with the parent file.
36 * Under Linux extended attributes are manipulated by the system
37 * calls getxattr(2), setxattr(2), and listxattr(2). They consider
38 * extended attributes to be name/value pairs where the name is a
39 * NULL terminated string. The name must also include one of the
40 * following namespace prefixes:
42 * user - No restrictions and is available to user applications.
43 * trusted - Restricted to kernel and root (CAP_SYS_ADMIN) use.
44 * system - Used for access control lists (system.nfs4_acl, etc).
45 * security - Used by SELinux to store a files security context.
47 * The value under Linux to limited to 65536 bytes of binary data.
48 * In practice, individual xattrs tend to be much smaller than this
49 * and are typically less than 100 bytes. A good example of this
50 * are the security.selinux xattrs which are less than 100 bytes and
51 * exist for every file when xattr labeling is enabled.
53 * The Linux xattr implementation has been written to take advantage of
54 * this typical usage. When the dataset property 'xattr=sa' is set,
55 * then xattrs will be preferentially stored as System Attributes (SA).
56 * This allows tiny xattrs (~100 bytes) to be stored with the dnode and
57 * up to 64k of xattrs to be stored in the spill block. If additional
58 * xattr space is required, which is unlikely under Linux, they will
59 * be stored using the traditional directory approach.
61 * This optimization results in roughly a 3x performance improvement
62 * when accessing xattrs because it avoids the need to perform a seek
63 * for every xattr value. When multiple xattrs are stored per-file
64 * the performance improvements are even greater because all of the
65 * xattrs stored in the spill block will be cached.
67 * However, by default SA based xattrs are disabled in the Linux port
68 * to maximize compatibility with other implementations. If you do
69 * enable SA based xattrs then they will not be visible on platforms
70 * which do not support this feature.
72 * NOTE: One additional consequence of the xattr directory implementation
73 * is that when an extended attribute is manipulated an inode is created.
74 * This inode will exist in the Linux inode cache but there will be no
75 * associated entry in the dentry cache which references it. This is
76 * safe but it may result in some confusion. Enabling SA based xattrs
77 * largely avoids the issue except in the overflow case.
80 #include <sys/zfs_vfsops.h>
81 #include <sys/zfs_vnops.h>
82 #include <sys/zfs_znode.h>
87 typedef struct xattr_filldir
{
91 struct dentry
*dentry
;
94 static const struct xattr_handler
*zpl_xattr_handler(const char *);
97 zpl_xattr_permission(xattr_filldir_t
*xf
, const char *name
, int name_len
)
99 static const struct xattr_handler
*handler
;
100 struct dentry
*d
= xf
->dentry
;
102 handler
= zpl_xattr_handler(name
);
107 #if defined(HAVE_XATTR_LIST_SIMPLE)
108 if (!handler
->list(d
))
110 #elif defined(HAVE_XATTR_LIST_DENTRY)
111 if (!handler
->list(d
, NULL
, 0, name
, name_len
, 0))
113 #elif defined(HAVE_XATTR_LIST_HANDLER)
114 if (!handler
->list(handler
, d
, NULL
, 0, name
, name_len
))
116 #elif defined(HAVE_XATTR_LIST_INODE)
117 if (!handler
->list(d
->d_inode
, NULL
, 0, name
, name_len
))
126 * Determine is a given xattr name should be visible and if so copy it
127 * in to the provided buffer (xf->buf).
130 zpl_xattr_filldir(xattr_filldir_t
*xf
, const char *name
, int name_len
)
132 /* Check permissions using the per-namespace list xattr handler. */
133 if (!zpl_xattr_permission(xf
, name
, name_len
))
136 /* When xf->buf is NULL only calculate the required size. */
138 if (xf
->offset
+ name_len
+ 1 > xf
->size
)
141 memcpy(xf
->buf
+ xf
->offset
, name
, name_len
);
142 xf
->buf
[xf
->offset
+ name_len
] = '\0';
145 xf
->offset
+= (name_len
+ 1);
151 * Read as many directory entry names as will fit in to the provided buffer,
152 * or when no buffer is provided calculate the required buffer size.
155 zpl_xattr_readdir(struct inode
*dxip
, xattr_filldir_t
*xf
)
161 zap_cursor_init(&zc
, ITOZSB(dxip
)->z_os
, ITOZ(dxip
)->z_id
);
163 while ((error
= -zap_cursor_retrieve(&zc
, &zap
)) == 0) {
165 if (zap
.za_integer_length
!= 8 || zap
.za_num_integers
!= 1) {
170 error
= zpl_xattr_filldir(xf
, zap
.za_name
, strlen(zap
.za_name
));
174 zap_cursor_advance(&zc
);
177 zap_cursor_fini(&zc
);
179 if (error
== -ENOENT
)
186 zpl_xattr_list_dir(xattr_filldir_t
*xf
, cred_t
*cr
)
188 struct inode
*ip
= xf
->dentry
->d_inode
;
189 struct inode
*dxip
= NULL
;
192 /* Lookup the xattr directory */
193 error
= -zfs_lookup(ip
, NULL
, &dxip
, LOOKUP_XATTR
, cr
, NULL
, NULL
);
195 if (error
== -ENOENT
)
201 error
= zpl_xattr_readdir(dxip
, xf
);
208 zpl_xattr_list_sa(xattr_filldir_t
*xf
)
210 znode_t
*zp
= ITOZ(xf
->dentry
->d_inode
);
211 nvpair_t
*nvp
= NULL
;
214 mutex_enter(&zp
->z_lock
);
215 if (zp
->z_xattr_cached
== NULL
)
216 error
= -zfs_sa_get_xattr(zp
);
217 mutex_exit(&zp
->z_lock
);
222 ASSERT(zp
->z_xattr_cached
);
224 while ((nvp
= nvlist_next_nvpair(zp
->z_xattr_cached
, nvp
)) != NULL
) {
225 ASSERT3U(nvpair_type(nvp
), ==, DATA_TYPE_BYTE_ARRAY
);
227 error
= zpl_xattr_filldir(xf
, nvpair_name(nvp
),
228 strlen(nvpair_name(nvp
)));
237 zpl_xattr_list(struct dentry
*dentry
, char *buffer
, size_t buffer_size
)
239 znode_t
*zp
= ITOZ(dentry
->d_inode
);
240 zfsvfs_t
*zfsvfs
= ZTOZSB(zp
);
241 xattr_filldir_t xf
= { buffer_size
, 0, buffer
, dentry
};
243 fstrans_cookie_t cookie
;
247 cookie
= spl_fstrans_mark();
250 rw_enter(&zp
->z_xattr_lock
, RW_READER
);
252 if (zfsvfs
->z_use_sa
&& zp
->z_is_sa
) {
253 error
= zpl_xattr_list_sa(&xf
);
258 error
= zpl_xattr_list_dir(&xf
, cr
);
265 rw_exit(&zp
->z_xattr_lock
);
267 spl_fstrans_unmark(cookie
);
274 zpl_xattr_get_dir(struct inode
*ip
, const char *name
, void *value
,
275 size_t size
, cred_t
*cr
)
277 struct inode
*dxip
= NULL
;
278 struct inode
*xip
= NULL
;
282 /* Lookup the xattr directory */
283 error
= -zfs_lookup(ip
, NULL
, &dxip
, LOOKUP_XATTR
, cr
, NULL
, NULL
);
287 /* Lookup a specific xattr name in the directory */
288 error
= -zfs_lookup(dxip
, (char *)name
, &xip
, 0, cr
, NULL
, NULL
);
293 error
= i_size_read(xip
);
297 if (size
< i_size_read(xip
)) {
302 error
= zpl_read_common(xip
, value
, size
, &pos
, UIO_SYSSPACE
, 0, cr
);
314 zpl_xattr_get_sa(struct inode
*ip
, const char *name
, void *value
, size_t size
)
316 znode_t
*zp
= ITOZ(ip
);
321 ASSERT(RW_LOCK_HELD(&zp
->z_xattr_lock
));
323 mutex_enter(&zp
->z_lock
);
324 if (zp
->z_xattr_cached
== NULL
)
325 error
= -zfs_sa_get_xattr(zp
);
326 mutex_exit(&zp
->z_lock
);
331 ASSERT(zp
->z_xattr_cached
);
332 error
= -nvlist_lookup_byte_array(zp
->z_xattr_cached
, name
,
333 &nv_value
, &nv_size
);
337 if (size
== 0 || value
== NULL
)
343 memcpy(value
, nv_value
, nv_size
);
349 __zpl_xattr_get(struct inode
*ip
, const char *name
, void *value
, size_t size
,
352 znode_t
*zp
= ITOZ(ip
);
353 zfsvfs_t
*zfsvfs
= ZTOZSB(zp
);
356 ASSERT(RW_LOCK_HELD(&zp
->z_xattr_lock
));
358 if (zfsvfs
->z_use_sa
&& zp
->z_is_sa
) {
359 error
= zpl_xattr_get_sa(ip
, name
, value
, size
);
360 if (error
!= -ENOENT
)
364 error
= zpl_xattr_get_dir(ip
, name
, value
, size
, cr
);
366 if (error
== -ENOENT
)
372 #define XATTR_NOENT 0x0
373 #define XATTR_IN_SA 0x1
374 #define XATTR_IN_DIR 0x2
375 /* check where the xattr resides */
377 __zpl_xattr_where(struct inode
*ip
, const char *name
, int *where
, cred_t
*cr
)
379 znode_t
*zp
= ITOZ(ip
);
380 zfsvfs_t
*zfsvfs
= ZTOZSB(zp
);
384 ASSERT(RW_LOCK_HELD(&zp
->z_xattr_lock
));
386 *where
= XATTR_NOENT
;
387 if (zfsvfs
->z_use_sa
&& zp
->z_is_sa
) {
388 error
= zpl_xattr_get_sa(ip
, name
, NULL
, 0);
390 *where
|= XATTR_IN_SA
;
391 else if (error
!= -ENOENT
)
395 error
= zpl_xattr_get_dir(ip
, name
, NULL
, 0, cr
);
397 *where
|= XATTR_IN_DIR
;
398 else if (error
!= -ENOENT
)
401 if (*where
== (XATTR_IN_SA
|XATTR_IN_DIR
))
402 cmn_err(CE_WARN
, "ZFS: inode %p has xattr \"%s\""
403 " in both SA and dir", ip
, name
);
404 if (*where
== XATTR_NOENT
)
412 zpl_xattr_get(struct inode
*ip
, const char *name
, void *value
, size_t size
)
414 znode_t
*zp
= ITOZ(ip
);
415 zfsvfs_t
*zfsvfs
= ZTOZSB(zp
);
417 fstrans_cookie_t cookie
;
421 cookie
= spl_fstrans_mark();
424 rw_enter(&zp
->z_xattr_lock
, RW_READER
);
425 error
= __zpl_xattr_get(ip
, name
, value
, size
, cr
);
426 rw_exit(&zp
->z_xattr_lock
);
428 spl_fstrans_unmark(cookie
);
435 zpl_xattr_set_dir(struct inode
*ip
, const char *name
, const void *value
,
436 size_t size
, int flags
, cred_t
*cr
)
438 struct inode
*dxip
= NULL
;
439 struct inode
*xip
= NULL
;
442 int lookup_flags
, error
;
443 const int xattr_mode
= S_IFREG
| 0644;
447 * Lookup the xattr directory. When we're adding an entry pass
448 * CREATE_XATTR_DIR to ensure the xattr directory is created.
449 * When removing an entry this flag is not passed to avoid
450 * unnecessarily creating a new xattr directory.
452 lookup_flags
= LOOKUP_XATTR
;
454 lookup_flags
|= CREATE_XATTR_DIR
;
456 error
= -zfs_lookup(ip
, NULL
, &dxip
, lookup_flags
, cr
, NULL
, NULL
);
460 /* Lookup a specific xattr name in the directory */
461 error
= -zfs_lookup(dxip
, (char *)name
, &xip
, 0, cr
, NULL
, NULL
);
462 if (error
&& (error
!= -ENOENT
))
467 /* Remove a specific name xattr when value is set to NULL. */
470 error
= -zfs_remove(dxip
, (char *)name
, cr
, 0);
475 /* Lookup failed create a new xattr. */
477 vap
= kmem_zalloc(sizeof (vattr_t
), KM_SLEEP
);
478 vap
->va_mode
= xattr_mode
;
479 vap
->va_mask
= ATTR_MODE
;
480 vap
->va_uid
= crgetfsuid(cr
);
481 vap
->va_gid
= crgetfsgid(cr
);
483 error
= -zfs_create(dxip
, (char *)name
, vap
, 0, 0644, &xip
,
491 error
= -zfs_freesp(ITOZ(xip
), 0, 0, xattr_mode
, TRUE
);
495 wrote
= zpl_write_common(xip
, value
, size
, &pos
, UIO_SYSSPACE
, 0, cr
);
502 ip
->i_ctime
= current_time(ip
);
503 zfs_mark_inode_dirty(ip
);
507 kmem_free(vap
, sizeof (vattr_t
));
515 if (error
== -ENOENT
)
518 ASSERT3S(error
, <=, 0);
524 zpl_xattr_set_sa(struct inode
*ip
, const char *name
, const void *value
,
525 size_t size
, int flags
, cred_t
*cr
)
527 znode_t
*zp
= ITOZ(ip
);
532 mutex_enter(&zp
->z_lock
);
533 if (zp
->z_xattr_cached
== NULL
)
534 error
= -zfs_sa_get_xattr(zp
);
535 mutex_exit(&zp
->z_lock
);
540 ASSERT(zp
->z_xattr_cached
);
541 nvl
= zp
->z_xattr_cached
;
544 error
= -nvlist_remove(nvl
, name
, DATA_TYPE_BYTE_ARRAY
);
545 if (error
== -ENOENT
)
546 error
= zpl_xattr_set_dir(ip
, name
, NULL
, 0, flags
, cr
);
548 /* Limited to 32k to keep nvpair memory allocations small */
549 if (size
> DXATTR_MAX_ENTRY_SIZE
)
552 /* Prevent the DXATTR SA from consuming the entire SA region */
553 error
= -nvlist_size(nvl
, &sa_size
, NV_ENCODE_XDR
);
557 if (sa_size
> DXATTR_MAX_SA_SIZE
)
560 error
= -nvlist_add_byte_array(nvl
, name
,
561 (uchar_t
*)value
, size
);
565 * Update the SA for additions, modifications, and removals. On
566 * error drop the inconsistent cached version of the nvlist, it
567 * will be reconstructed from the ARC when next accessed.
570 error
= -zfs_sa_set_xattr(zp
);
574 zp
->z_xattr_cached
= NULL
;
577 ASSERT3S(error
, <=, 0);
583 zpl_xattr_set(struct inode
*ip
, const char *name
, const void *value
,
584 size_t size
, int flags
)
586 znode_t
*zp
= ITOZ(ip
);
587 zfsvfs_t
*zfsvfs
= ZTOZSB(zp
);
589 fstrans_cookie_t cookie
;
594 cookie
= spl_fstrans_mark();
597 rw_enter(&ITOZ(ip
)->z_xattr_lock
, RW_WRITER
);
600 * Before setting the xattr check to see if it already exists.
601 * This is done to ensure the following optional flags are honored.
603 * XATTR_CREATE: fail if xattr already exists
604 * XATTR_REPLACE: fail if xattr does not exist
606 * We also want to know if it resides in sa or dir, so we can make
607 * sure we don't end up with duplicate in both places.
609 error
= __zpl_xattr_where(ip
, name
, &where
, cr
);
611 if (error
!= -ENODATA
)
613 if (flags
& XATTR_REPLACE
)
616 /* The xattr to be removed already doesn't exist */
622 if (flags
& XATTR_CREATE
)
626 /* Preferentially store the xattr as a SA for better performance */
627 if (zfsvfs
->z_use_sa
&& zp
->z_is_sa
&&
628 (zfsvfs
->z_xattr_sa
|| (value
== NULL
&& where
& XATTR_IN_SA
))) {
629 error
= zpl_xattr_set_sa(ip
, name
, value
, size
, flags
, cr
);
632 * Successfully put into SA, we need to clear the one
635 if (where
& XATTR_IN_DIR
)
636 zpl_xattr_set_dir(ip
, name
, NULL
, 0, 0, cr
);
641 error
= zpl_xattr_set_dir(ip
, name
, value
, size
, flags
, cr
);
643 * Successfully put into dir, we need to clear the one in SA.
645 if (error
== 0 && (where
& XATTR_IN_SA
))
646 zpl_xattr_set_sa(ip
, name
, NULL
, 0, 0, cr
);
648 rw_exit(&ITOZ(ip
)->z_xattr_lock
);
650 spl_fstrans_unmark(cookie
);
652 ASSERT3S(error
, <=, 0);
658 * Extended user attributes
660 * "Extended user attributes may be assigned to files and directories for
661 * storing arbitrary additional information such as the mime type,
662 * character set or encoding of a file. The access permissions for user
663 * attributes are defined by the file permission bits: read permission
664 * is required to retrieve the attribute value, and writer permission is
665 * required to change it.
667 * The file permission bits of regular files and directories are
668 * interpreted differently from the file permission bits of special
669 * files and symbolic links. For regular files and directories the file
670 * permission bits define access to the file's contents, while for
671 * device special files they define access to the device described by
672 * the special file. The file permissions of symbolic links are not
673 * used in access checks. These differences would allow users to
674 * consume filesystem resources in a way not controllable by disk quotas
675 * for group or world writable special files and directories.
677 * For this reason, extended user attributes are allowed only for
678 * regular files and directories, and access to extended user attributes
679 * is restricted to the owner and to users with appropriate capabilities
680 * for directories with the sticky bit set (see the chmod(1) manual page
681 * for an explanation of the sticky bit)." - xattr(7)
683 * ZFS allows extended user attributes to be disabled administratively
684 * by setting the 'xattr=off' property on the dataset.
687 __zpl_xattr_user_list(struct inode
*ip
, char *list
, size_t list_size
,
688 const char *name
, size_t name_len
)
690 return (ITOZSB(ip
)->z_flags
& ZSB_XATTR
);
692 ZPL_XATTR_LIST_WRAPPER(zpl_xattr_user_list
);
695 __zpl_xattr_user_get(struct inode
*ip
, const char *name
,
696 void *value
, size_t size
)
700 /* xattr_resolve_name will do this for us if this is defined */
701 #ifndef HAVE_XATTR_HANDLER_NAME
702 if (strcmp(name
, "") == 0)
705 if (!(ITOZSB(ip
)->z_flags
& ZSB_XATTR
))
706 return (-EOPNOTSUPP
);
708 xattr_name
= kmem_asprintf("%s%s", XATTR_USER_PREFIX
, name
);
709 error
= zpl_xattr_get(ip
, xattr_name
, value
, size
);
714 ZPL_XATTR_GET_WRAPPER(zpl_xattr_user_get
);
717 __zpl_xattr_user_set(struct inode
*ip
, const char *name
,
718 const void *value
, size_t size
, int flags
)
722 /* xattr_resolve_name will do this for us if this is defined */
723 #ifndef HAVE_XATTR_HANDLER_NAME
724 if (strcmp(name
, "") == 0)
727 if (!(ITOZSB(ip
)->z_flags
& ZSB_XATTR
))
728 return (-EOPNOTSUPP
);
730 xattr_name
= kmem_asprintf("%s%s", XATTR_USER_PREFIX
, name
);
731 error
= zpl_xattr_set(ip
, xattr_name
, value
, size
, flags
);
736 ZPL_XATTR_SET_WRAPPER(zpl_xattr_user_set
);
738 xattr_handler_t zpl_xattr_user_handler
=
740 .prefix
= XATTR_USER_PREFIX
,
741 .list
= zpl_xattr_user_list
,
742 .get
= zpl_xattr_user_get
,
743 .set
= zpl_xattr_user_set
,
747 * Trusted extended attributes
749 * "Trusted extended attributes are visible and accessible only to
750 * processes that have the CAP_SYS_ADMIN capability. Attributes in this
751 * class are used to implement mechanisms in user space (i.e., outside
752 * the kernel) which keep information in extended attributes to which
753 * ordinary processes should not have access." - xattr(7)
756 __zpl_xattr_trusted_list(struct inode
*ip
, char *list
, size_t list_size
,
757 const char *name
, size_t name_len
)
759 return (capable(CAP_SYS_ADMIN
));
761 ZPL_XATTR_LIST_WRAPPER(zpl_xattr_trusted_list
);
764 __zpl_xattr_trusted_get(struct inode
*ip
, const char *name
,
765 void *value
, size_t size
)
770 if (!capable(CAP_SYS_ADMIN
))
772 /* xattr_resolve_name will do this for us if this is defined */
773 #ifndef HAVE_XATTR_HANDLER_NAME
774 if (strcmp(name
, "") == 0)
777 xattr_name
= kmem_asprintf("%s%s", XATTR_TRUSTED_PREFIX
, name
);
778 error
= zpl_xattr_get(ip
, xattr_name
, value
, size
);
783 ZPL_XATTR_GET_WRAPPER(zpl_xattr_trusted_get
);
786 __zpl_xattr_trusted_set(struct inode
*ip
, const char *name
,
787 const void *value
, size_t size
, int flags
)
792 if (!capable(CAP_SYS_ADMIN
))
794 /* xattr_resolve_name will do this for us if this is defined */
795 #ifndef HAVE_XATTR_HANDLER_NAME
796 if (strcmp(name
, "") == 0)
799 xattr_name
= kmem_asprintf("%s%s", XATTR_TRUSTED_PREFIX
, name
);
800 error
= zpl_xattr_set(ip
, xattr_name
, value
, size
, flags
);
805 ZPL_XATTR_SET_WRAPPER(zpl_xattr_trusted_set
);
807 xattr_handler_t zpl_xattr_trusted_handler
=
809 .prefix
= XATTR_TRUSTED_PREFIX
,
810 .list
= zpl_xattr_trusted_list
,
811 .get
= zpl_xattr_trusted_get
,
812 .set
= zpl_xattr_trusted_set
,
816 * Extended security attributes
818 * "The security attribute namespace is used by kernel security modules,
819 * such as Security Enhanced Linux, and also to implement file
820 * capabilities (see capabilities(7)). Read and write access
821 * permissions to security attributes depend on the policy implemented
822 * for each security attribute by the security module. When no security
823 * module is loaded, all processes have read access to extended security
824 * attributes, and write access is limited to processes that have the
825 * CAP_SYS_ADMIN capability." - xattr(7)
828 __zpl_xattr_security_list(struct inode
*ip
, char *list
, size_t list_size
,
829 const char *name
, size_t name_len
)
833 ZPL_XATTR_LIST_WRAPPER(zpl_xattr_security_list
);
836 __zpl_xattr_security_get(struct inode
*ip
, const char *name
,
837 void *value
, size_t size
)
841 /* xattr_resolve_name will do this for us if this is defined */
842 #ifndef HAVE_XATTR_HANDLER_NAME
843 if (strcmp(name
, "") == 0)
846 xattr_name
= kmem_asprintf("%s%s", XATTR_SECURITY_PREFIX
, name
);
847 error
= zpl_xattr_get(ip
, xattr_name
, value
, size
);
852 ZPL_XATTR_GET_WRAPPER(zpl_xattr_security_get
);
855 __zpl_xattr_security_set(struct inode
*ip
, const char *name
,
856 const void *value
, size_t size
, int flags
)
860 /* xattr_resolve_name will do this for us if this is defined */
861 #ifndef HAVE_XATTR_HANDLER_NAME
862 if (strcmp(name
, "") == 0)
865 xattr_name
= kmem_asprintf("%s%s", XATTR_SECURITY_PREFIX
, name
);
866 error
= zpl_xattr_set(ip
, xattr_name
, value
, size
, flags
);
871 ZPL_XATTR_SET_WRAPPER(zpl_xattr_security_set
);
873 #ifdef HAVE_CALLBACK_SECURITY_INODE_INIT_SECURITY
875 __zpl_xattr_security_init(struct inode
*ip
, const struct xattr
*xattrs
,
878 const struct xattr
*xattr
;
881 for (xattr
= xattrs
; xattr
->name
!= NULL
; xattr
++) {
882 error
= __zpl_xattr_security_set(ip
,
883 xattr
->name
, xattr
->value
, xattr
->value_len
, 0);
893 zpl_xattr_security_init(struct inode
*ip
, struct inode
*dip
,
894 const struct qstr
*qstr
)
896 return security_inode_init_security(ip
, dip
, qstr
,
897 &__zpl_xattr_security_init
, NULL
);
902 zpl_xattr_security_init(struct inode
*ip
, struct inode
*dip
,
903 const struct qstr
*qstr
)
910 error
= zpl_security_inode_init_security(ip
, dip
, qstr
,
911 &name
, &value
, &len
);
913 if (error
== -EOPNOTSUPP
)
919 error
= __zpl_xattr_security_set(ip
, name
, value
, len
, 0);
926 #endif /* HAVE_CALLBACK_SECURITY_INODE_INIT_SECURITY */
929 * Security xattr namespace handlers.
931 xattr_handler_t zpl_xattr_security_handler
= {
932 .prefix
= XATTR_SECURITY_PREFIX
,
933 .list
= zpl_xattr_security_list
,
934 .get
= zpl_xattr_security_get
,
935 .set
= zpl_xattr_security_set
,
939 * Extended system attributes
941 * "Extended system attributes are used by the kernel to store system
942 * objects such as Access Control Lists. Read and write access permissions
943 * to system attributes depend on the policy implemented for each system
944 * attribute implemented by filesystems in the kernel." - xattr(7)
946 #ifdef CONFIG_FS_POSIX_ACL
948 zpl_set_acl(struct inode
*ip
, struct posix_acl
*acl
, int type
)
950 char *name
, *value
= NULL
;
954 if (S_ISLNK(ip
->i_mode
))
955 return (-EOPNOTSUPP
);
958 case ACL_TYPE_ACCESS
:
959 name
= XATTR_NAME_POSIX_ACL_ACCESS
;
961 zpl_equivmode_t mode
= ip
->i_mode
;
962 error
= posix_acl_equiv_mode(acl
, &mode
);
967 * The mode bits will have been set by
968 * ->zfs_setattr()->zfs_acl_chmod_setattr()
969 * using the ZFS ACL conversion. If they
970 * differ from the Posix ACL conversion dirty
971 * the inode to write the Posix mode bits.
973 if (ip
->i_mode
!= mode
) {
975 ip
->i_ctime
= current_time(ip
);
976 zfs_mark_inode_dirty(ip
);
985 case ACL_TYPE_DEFAULT
:
986 name
= XATTR_NAME_POSIX_ACL_DEFAULT
;
987 if (!S_ISDIR(ip
->i_mode
))
988 return (acl
? -EACCES
: 0);
996 size
= posix_acl_xattr_size(acl
->a_count
);
997 value
= kmem_alloc(size
, KM_SLEEP
);
999 error
= zpl_acl_to_xattr(acl
, value
, size
);
1001 kmem_free(value
, size
);
1006 error
= zpl_xattr_set(ip
, name
, value
, size
, 0);
1008 kmem_free(value
, size
);
1012 zpl_set_cached_acl(ip
, type
, acl
);
1014 zpl_forget_cached_acl(ip
, type
);
1021 zpl_get_acl(struct inode
*ip
, int type
)
1023 struct posix_acl
*acl
;
1029 * As of Linux 3.14, the kernel get_acl will check this for us.
1030 * Also as of Linux 4.7, comparing against ACL_NOT_CACHED is wrong
1031 * as the kernel get_acl will set it to temporary sentinel value.
1033 #ifndef HAVE_KERNEL_GET_ACL_HANDLE_CACHE
1034 acl
= get_cached_acl(ip
, type
);
1035 if (acl
!= ACL_NOT_CACHED
)
1040 case ACL_TYPE_ACCESS
:
1041 name
= XATTR_NAME_POSIX_ACL_ACCESS
;
1043 case ACL_TYPE_DEFAULT
:
1044 name
= XATTR_NAME_POSIX_ACL_DEFAULT
;
1047 return (ERR_PTR(-EINVAL
));
1050 size
= zpl_xattr_get(ip
, name
, NULL
, 0);
1052 value
= kmem_alloc(size
, KM_SLEEP
);
1053 size
= zpl_xattr_get(ip
, name
, value
, size
);
1057 acl
= zpl_acl_from_xattr(value
, size
);
1058 } else if (size
== -ENODATA
|| size
== -ENOSYS
) {
1061 acl
= ERR_PTR(-EIO
);
1065 kmem_free(value
, size
);
1067 /* As of Linux 4.7, the kernel get_acl will set this for us */
1068 #ifndef HAVE_KERNEL_GET_ACL_HANDLE_CACHE
1070 zpl_set_cached_acl(ip
, type
, acl
);
1076 #if !defined(HAVE_GET_ACL)
1078 __zpl_check_acl(struct inode
*ip
, int mask
)
1080 struct posix_acl
*acl
;
1083 acl
= zpl_get_acl(ip
, ACL_TYPE_ACCESS
);
1085 return (PTR_ERR(acl
));
1088 error
= posix_acl_permission(ip
, acl
, mask
);
1089 zpl_posix_acl_release(acl
);
1096 #if defined(HAVE_CHECK_ACL_WITH_FLAGS)
1098 zpl_check_acl(struct inode
*ip
, int mask
, unsigned int flags
)
1100 return (__zpl_check_acl(ip
, mask
));
1102 #elif defined(HAVE_CHECK_ACL)
1104 zpl_check_acl(struct inode
*ip
, int mask
)
1106 return (__zpl_check_acl(ip
, mask
));
1108 #elif defined(HAVE_PERMISSION_WITH_NAMEIDATA)
1110 zpl_permission(struct inode
*ip
, int mask
, struct nameidata
*nd
)
1112 return (generic_permission(ip
, mask
, __zpl_check_acl
));
1114 #elif defined(HAVE_PERMISSION)
1116 zpl_permission(struct inode
*ip
, int mask
)
1118 return (generic_permission(ip
, mask
, __zpl_check_acl
));
1120 #endif /* HAVE_CHECK_ACL | HAVE_PERMISSION */
1121 #endif /* !HAVE_GET_ACL */
1124 zpl_init_acl(struct inode
*ip
, struct inode
*dir
)
1126 struct posix_acl
*acl
= NULL
;
1129 if (ITOZSB(ip
)->z_acl_type
!= ZFS_ACLTYPE_POSIXACL
)
1132 if (!S_ISLNK(ip
->i_mode
)) {
1133 if (ITOZSB(ip
)->z_acl_type
== ZFS_ACLTYPE_POSIXACL
) {
1134 acl
= zpl_get_acl(dir
, ACL_TYPE_DEFAULT
);
1136 return (PTR_ERR(acl
));
1140 ip
->i_mode
&= ~current_umask();
1141 ip
->i_ctime
= current_time(ip
);
1142 zfs_mark_inode_dirty(ip
);
1147 if ((ITOZSB(ip
)->z_acl_type
== ZFS_ACLTYPE_POSIXACL
) && acl
) {
1150 if (S_ISDIR(ip
->i_mode
)) {
1151 error
= zpl_set_acl(ip
, acl
, ACL_TYPE_DEFAULT
);
1157 error
= __posix_acl_create(&acl
, GFP_KERNEL
, &mode
);
1160 zfs_mark_inode_dirty(ip
);
1162 error
= zpl_set_acl(ip
, acl
, ACL_TYPE_ACCESS
);
1166 zpl_posix_acl_release(acl
);
1172 zpl_chmod_acl(struct inode
*ip
)
1174 struct posix_acl
*acl
;
1177 if (ITOZSB(ip
)->z_acl_type
!= ZFS_ACLTYPE_POSIXACL
)
1180 if (S_ISLNK(ip
->i_mode
))
1181 return (-EOPNOTSUPP
);
1183 acl
= zpl_get_acl(ip
, ACL_TYPE_ACCESS
);
1184 if (IS_ERR(acl
) || !acl
)
1185 return (PTR_ERR(acl
));
1187 error
= __posix_acl_chmod(&acl
, GFP_KERNEL
, ip
->i_mode
);
1189 error
= zpl_set_acl(ip
, acl
, ACL_TYPE_ACCESS
);
1191 zpl_posix_acl_release(acl
);
1197 __zpl_xattr_acl_list_access(struct inode
*ip
, char *list
, size_t list_size
,
1198 const char *name
, size_t name_len
)
1200 char *xattr_name
= XATTR_NAME_POSIX_ACL_ACCESS
;
1201 size_t xattr_size
= sizeof (XATTR_NAME_POSIX_ACL_ACCESS
);
1203 if (ITOZSB(ip
)->z_acl_type
!= ZFS_ACLTYPE_POSIXACL
)
1206 if (list
&& xattr_size
<= list_size
)
1207 memcpy(list
, xattr_name
, xattr_size
);
1209 return (xattr_size
);
1211 ZPL_XATTR_LIST_WRAPPER(zpl_xattr_acl_list_access
);
1214 __zpl_xattr_acl_list_default(struct inode
*ip
, char *list
, size_t list_size
,
1215 const char *name
, size_t name_len
)
1217 char *xattr_name
= XATTR_NAME_POSIX_ACL_DEFAULT
;
1218 size_t xattr_size
= sizeof (XATTR_NAME_POSIX_ACL_DEFAULT
);
1220 if (ITOZSB(ip
)->z_acl_type
!= ZFS_ACLTYPE_POSIXACL
)
1223 if (list
&& xattr_size
<= list_size
)
1224 memcpy(list
, xattr_name
, xattr_size
);
1226 return (xattr_size
);
1228 ZPL_XATTR_LIST_WRAPPER(zpl_xattr_acl_list_default
);
1231 __zpl_xattr_acl_get_access(struct inode
*ip
, const char *name
,
1232 void *buffer
, size_t size
)
1234 struct posix_acl
*acl
;
1235 int type
= ACL_TYPE_ACCESS
;
1237 /* xattr_resolve_name will do this for us if this is defined */
1238 #ifndef HAVE_XATTR_HANDLER_NAME
1239 if (strcmp(name
, "") != 0)
1242 if (ITOZSB(ip
)->z_acl_type
!= ZFS_ACLTYPE_POSIXACL
)
1243 return (-EOPNOTSUPP
);
1245 acl
= zpl_get_acl(ip
, type
);
1247 return (PTR_ERR(acl
));
1251 error
= zpl_acl_to_xattr(acl
, buffer
, size
);
1252 zpl_posix_acl_release(acl
);
1256 ZPL_XATTR_GET_WRAPPER(zpl_xattr_acl_get_access
);
1259 __zpl_xattr_acl_get_default(struct inode
*ip
, const char *name
,
1260 void *buffer
, size_t size
)
1262 struct posix_acl
*acl
;
1263 int type
= ACL_TYPE_DEFAULT
;
1265 /* xattr_resolve_name will do this for us if this is defined */
1266 #ifndef HAVE_XATTR_HANDLER_NAME
1267 if (strcmp(name
, "") != 0)
1270 if (ITOZSB(ip
)->z_acl_type
!= ZFS_ACLTYPE_POSIXACL
)
1271 return (-EOPNOTSUPP
);
1273 acl
= zpl_get_acl(ip
, type
);
1275 return (PTR_ERR(acl
));
1279 error
= zpl_acl_to_xattr(acl
, buffer
, size
);
1280 zpl_posix_acl_release(acl
);
1284 ZPL_XATTR_GET_WRAPPER(zpl_xattr_acl_get_default
);
1287 __zpl_xattr_acl_set_access(struct inode
*ip
, const char *name
,
1288 const void *value
, size_t size
, int flags
)
1290 struct posix_acl
*acl
;
1291 int type
= ACL_TYPE_ACCESS
;
1293 /* xattr_resolve_name will do this for us if this is defined */
1294 #ifndef HAVE_XATTR_HANDLER_NAME
1295 if (strcmp(name
, "") != 0)
1298 if (ITOZSB(ip
)->z_acl_type
!= ZFS_ACLTYPE_POSIXACL
)
1299 return (-EOPNOTSUPP
);
1301 if (!zpl_inode_owner_or_capable(ip
))
1305 acl
= zpl_acl_from_xattr(value
, size
);
1307 return (PTR_ERR(acl
));
1309 error
= zpl_posix_acl_valid(ip
, acl
);
1311 zpl_posix_acl_release(acl
);
1319 error
= zpl_set_acl(ip
, acl
, type
);
1320 zpl_posix_acl_release(acl
);
1324 ZPL_XATTR_SET_WRAPPER(zpl_xattr_acl_set_access
);
1327 __zpl_xattr_acl_set_default(struct inode
*ip
, const char *name
,
1328 const void *value
, size_t size
, int flags
)
1330 struct posix_acl
*acl
;
1331 int type
= ACL_TYPE_DEFAULT
;
1333 /* xattr_resolve_name will do this for us if this is defined */
1334 #ifndef HAVE_XATTR_HANDLER_NAME
1335 if (strcmp(name
, "") != 0)
1338 if (ITOZSB(ip
)->z_acl_type
!= ZFS_ACLTYPE_POSIXACL
)
1339 return (-EOPNOTSUPP
);
1341 if (!zpl_inode_owner_or_capable(ip
))
1345 acl
= zpl_acl_from_xattr(value
, size
);
1347 return (PTR_ERR(acl
));
1349 error
= zpl_posix_acl_valid(ip
, acl
);
1351 zpl_posix_acl_release(acl
);
1359 error
= zpl_set_acl(ip
, acl
, type
);
1360 zpl_posix_acl_release(acl
);
1364 ZPL_XATTR_SET_WRAPPER(zpl_xattr_acl_set_default
);
1367 * ACL access xattr namespace handlers.
1369 * Use .name instead of .prefix when available. xattr_resolve_name will match
1370 * whole name and reject anything that has .name only as prefix.
1372 xattr_handler_t zpl_xattr_acl_access_handler
=
1374 #ifdef HAVE_XATTR_HANDLER_NAME
1375 .name
= XATTR_NAME_POSIX_ACL_ACCESS
,
1377 .prefix
= XATTR_NAME_POSIX_ACL_ACCESS
,
1379 .list
= zpl_xattr_acl_list_access
,
1380 .get
= zpl_xattr_acl_get_access
,
1381 .set
= zpl_xattr_acl_set_access
,
1382 #if defined(HAVE_XATTR_LIST_SIMPLE) || \
1383 defined(HAVE_XATTR_LIST_DENTRY) || \
1384 defined(HAVE_XATTR_LIST_HANDLER)
1385 .flags
= ACL_TYPE_ACCESS
,
1390 * ACL default xattr namespace handlers.
1392 * Use .name instead of .prefix when available. xattr_resolve_name will match
1393 * whole name and reject anything that has .name only as prefix.
1395 xattr_handler_t zpl_xattr_acl_default_handler
=
1397 #ifdef HAVE_XATTR_HANDLER_NAME
1398 .name
= XATTR_NAME_POSIX_ACL_DEFAULT
,
1400 .prefix
= XATTR_NAME_POSIX_ACL_DEFAULT
,
1402 .list
= zpl_xattr_acl_list_default
,
1403 .get
= zpl_xattr_acl_get_default
,
1404 .set
= zpl_xattr_acl_set_default
,
1405 #if defined(HAVE_XATTR_LIST_SIMPLE) || \
1406 defined(HAVE_XATTR_LIST_DENTRY) || \
1407 defined(HAVE_XATTR_LIST_HANDLER)
1408 .flags
= ACL_TYPE_DEFAULT
,
1412 #endif /* CONFIG_FS_POSIX_ACL */
1414 xattr_handler_t
*zpl_xattr_handlers
[] = {
1415 &zpl_xattr_security_handler
,
1416 &zpl_xattr_trusted_handler
,
1417 &zpl_xattr_user_handler
,
1418 #ifdef CONFIG_FS_POSIX_ACL
1419 &zpl_xattr_acl_access_handler
,
1420 &zpl_xattr_acl_default_handler
,
1421 #endif /* CONFIG_FS_POSIX_ACL */
1425 static const struct xattr_handler
*
1426 zpl_xattr_handler(const char *name
)
1428 if (strncmp(name
, XATTR_USER_PREFIX
,
1429 XATTR_USER_PREFIX_LEN
) == 0)
1430 return (&zpl_xattr_user_handler
);
1432 if (strncmp(name
, XATTR_TRUSTED_PREFIX
,
1433 XATTR_TRUSTED_PREFIX_LEN
) == 0)
1434 return (&zpl_xattr_trusted_handler
);
1436 if (strncmp(name
, XATTR_SECURITY_PREFIX
,
1437 XATTR_SECURITY_PREFIX_LEN
) == 0)
1438 return (&zpl_xattr_security_handler
);
1440 #ifdef CONFIG_FS_POSIX_ACL
1441 if (strncmp(name
, XATTR_NAME_POSIX_ACL_ACCESS
,
1442 sizeof (XATTR_NAME_POSIX_ACL_ACCESS
)) == 0)
1443 return (&zpl_xattr_acl_access_handler
);
1445 if (strncmp(name
, XATTR_NAME_POSIX_ACL_DEFAULT
,
1446 sizeof (XATTR_NAME_POSIX_ACL_DEFAULT
)) == 0)
1447 return (&zpl_xattr_acl_default_handler
);
1448 #endif /* CONFIG_FS_POSIX_ACL */
1453 #if !defined(HAVE_POSIX_ACL_RELEASE) || defined(HAVE_POSIX_ACL_RELEASE_GPL_ONLY)
1454 struct acl_rel_struct
{
1455 struct acl_rel_struct
*next
;
1456 struct posix_acl
*acl
;
1460 #define ACL_REL_GRACE (60*HZ)
1461 #define ACL_REL_WINDOW (1*HZ)
1462 #define ACL_REL_SCHED (ACL_REL_GRACE+ACL_REL_WINDOW)
1465 * Lockless multi-producer single-consumer fifo list.
1466 * Nodes are added to tail and removed from head. Tail pointer is our
1467 * synchronization point. It always points to the next pointer of the last
1468 * node, or head if list is empty.
1470 static struct acl_rel_struct
*acl_rel_head
= NULL
;
1471 static struct acl_rel_struct
**acl_rel_tail
= &acl_rel_head
;
1474 zpl_posix_acl_free(void *arg
)
1476 struct acl_rel_struct
*freelist
= NULL
;
1477 struct acl_rel_struct
*a
;
1479 boolean_t refire
= B_FALSE
;
1481 ASSERT3P(acl_rel_head
, !=, NULL
);
1482 while (acl_rel_head
) {
1484 if (ddi_get_lbolt() - a
->time
>= ACL_REL_GRACE
) {
1486 * If a is the last node we need to reset tail, but we
1487 * need to use cmpxchg to make sure it is still the
1490 if (acl_rel_tail
== &a
->next
) {
1491 acl_rel_head
= NULL
;
1492 if (cmpxchg(&acl_rel_tail
, &a
->next
,
1493 &acl_rel_head
) == &a
->next
) {
1494 ASSERT3P(a
->next
, ==, NULL
);
1501 * a is not last node, make sure next pointer is set
1502 * by the adder and advance the head.
1504 while (READ_ONCE(a
->next
) == NULL
)
1506 acl_rel_head
= a
->next
;
1511 * a is still in grace period. We are responsible to
1512 * reschedule the free task, since adder will only do
1513 * so if list is empty.
1515 new_time
= a
->time
+ ACL_REL_SCHED
;
1522 taskq_dispatch_delay(system_delay_taskq
, zpl_posix_acl_free
,
1523 NULL
, TQ_SLEEP
, new_time
);
1529 kmem_free(a
, sizeof (struct acl_rel_struct
));
1534 zpl_posix_acl_release_impl(struct posix_acl
*acl
)
1536 struct acl_rel_struct
*a
, **prev
;
1538 a
= kmem_alloc(sizeof (struct acl_rel_struct
), KM_SLEEP
);
1541 a
->time
= ddi_get_lbolt();
1542 /* atomically points tail to us and get the previous tail */
1543 prev
= xchg(&acl_rel_tail
, &a
->next
);
1544 ASSERT3P(*prev
, ==, NULL
);
1546 /* if it was empty before, schedule the free task */
1547 if (prev
== &acl_rel_head
)
1548 taskq_dispatch_delay(system_delay_taskq
, zpl_posix_acl_free
,
1549 NULL
, TQ_SLEEP
, ddi_get_lbolt() + ACL_REL_SCHED
);