[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / xfs / xfs_acl.c

/*
 * Copyright (c) 2008, Christoph Hellwig
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "xfs.h"
#include "xfs_acl.h"
#include "xfs_attr.h"
#include "xfs_bmap_btree.h"
#include "xfs_inode.h"
#include "xfs_vnodeops.h"
#include "xfs_sb.h"
#include "xfs_mount.h"
#include "xfs_trace.h"
#include <linux/slab.h>
#include <linux/xattr.h>
#include <linux/posix_acl_xattr.h>


/*
 * Locking scheme:
 *  - all ACL updates are protected by inode->i_mutex, which is taken before
 *    calling into this file.
 */

STATIC struct posix_acl *
xfs_acl_from_disk(
	struct xfs_acl	*aclp,
	int		max_entries)
{
	struct posix_acl_entry *acl_e;
	struct posix_acl *acl;
	struct xfs_acl_entry *ace;
	unsigned int count, i;

	count = be32_to_cpu(aclp->acl_cnt);
	if (count > max_entries)
		return ERR_PTR(-EFSCORRUPTED);

	acl = posix_acl_alloc(count, GFP_KERNEL);
	if (!acl)
		return ERR_PTR(-ENOMEM);

	for (i = 0; i < count; i++) {
		acl_e = &acl->a_entries[i];
		ace = &aclp->acl_entry[i];

		/*
		 * The tag is 32 bits on disk and 16 bits in core.
		 *
		 * Because every access to it goes through the core
		 * format first this is not a problem.
		 */
		acl_e->e_tag = be32_to_cpu(ace->ae_tag);
		acl_e->e_perm = be16_to_cpu(ace->ae_perm);

		switch (acl_e->e_tag) {
		case ACL_USER:
		case ACL_GROUP:
			acl_e->e_id = be32_to_cpu(ace->ae_id);
			break;
		case ACL_USER_OBJ:
		case ACL_GROUP_OBJ:
		case ACL_MASK:
		case ACL_OTHER:
			acl_e->e_id = ACL_UNDEFINED_ID;
			break;
		default:
			goto fail;
		}
	}
	return acl;

fail:
	posix_acl_release(acl);
	return ERR_PTR(-EINVAL);
}

STATIC void
xfs_acl_to_disk(struct xfs_acl *aclp, const struct posix_acl *acl)
{
	const struct posix_acl_entry *acl_e;
	struct xfs_acl_entry *ace;
	int i;

	aclp->acl_cnt = cpu_to_be32(acl->a_count);
	for (i = 0; i < acl->a_count; i++) {
		ace = &aclp->acl_entry[i];
		acl_e = &acl->a_entries[i];

		ace->ae_tag = cpu_to_be32(acl_e->e_tag);
		ace->ae_id = cpu_to_be32(acl_e->e_id);
		ace->ae_perm = cpu_to_be16(acl_e->e_perm);
	}
}

struct posix_acl *
xfs_get_acl(struct inode *inode, int type)
{
	struct xfs_inode *ip = XFS_I(inode);
	struct posix_acl *acl;
	struct xfs_acl *xfs_acl;
	unsigned char *ea_name;
	int error;
	int len;

	acl = get_cached_acl(inode, type);
	if (acl != ACL_NOT_CACHED)
		return acl;

	trace_xfs_get_acl(ip);

	switch (type) {
	case ACL_TYPE_ACCESS:
		ea_name = SGI_ACL_FILE;
		break;
	case ACL_TYPE_DEFAULT:
		ea_name = SGI_ACL_DEFAULT;
		break;
	default:
		BUG();
	}

	/*
	 * If we have a cached ACLs value just return it, not need to
	 * go out to the disk.
	 */
	len = XFS_ACL_MAX_SIZE(ip->i_mount);
	xfs_acl = kzalloc(len, GFP_KERNEL);
	if (!xfs_acl)
		return ERR_PTR(-ENOMEM);

	error = -xfs_attr_get(ip, ea_name, (unsigned char *)xfs_acl,
							&len, ATTR_ROOT);
	if (error) {
		/*
		 * If the attribute doesn't exist make sure we have a negative
		 * cache entry, for any other error assume it is transient and
		 * leave the cache entry as ACL_NOT_CACHED.
		 */
		if (error == -ENOATTR) {
			acl = NULL;
			goto out_update_cache;
		}
		goto out;
	}

	acl = xfs_acl_from_disk(xfs_acl, XFS_ACL_MAX_ENTRIES(ip->i_mount));
	if (IS_ERR(acl))
		goto out;

 out_update_cache:
	set_cached_acl(inode, type, acl);
 out:
	kfree(xfs_acl);
	return acl;
}

STATIC int
xfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
{
	struct xfs_inode *ip = XFS_I(inode);
	unsigned char *ea_name;
	int error;

	if (S_ISLNK(inode->i_mode))
		return -EOPNOTSUPP;

	switch (type) {
	case ACL_TYPE_ACCESS:
		ea_name = SGI_ACL_FILE;
		break;
	case ACL_TYPE_DEFAULT:
		if (!S_ISDIR(inode->i_mode))
			return acl ? -EACCES : 0;
		ea_name = SGI_ACL_DEFAULT;
		break;
	default:
		return -EINVAL;
	}

	if (acl) {
		struct xfs_acl *xfs_acl;
		int len = XFS_ACL_MAX_SIZE(ip->i_mount);

		xfs_acl = kzalloc(len, GFP_KERNEL);
		if (!xfs_acl)
			return -ENOMEM;

		xfs_acl_to_disk(xfs_acl, acl);

		/* subtract away the unused acl entries */
		len -= sizeof(struct xfs_acl_entry) *
			 (XFS_ACL_MAX_ENTRIES(ip->i_mount) - acl->a_count);

		error = -xfs_attr_set(ip, ea_name, (unsigned char *)xfs_acl,
				len, ATTR_ROOT);

		kfree(xfs_acl);
	} else {
		/*
		 * A NULL ACL argument means we want to remove the ACL.
		 */
		error = -xfs_attr_remove(ip, ea_name, ATTR_ROOT);

		/*
		 * If the attribute didn't exist to start with that's fine.
		 */
		if (error == -ENOATTR)
			error = 0;
	}

	if (!error)
		set_cached_acl(inode, type, acl);
	return error;
}

static int
xfs_set_mode(struct inode *inode, umode_t mode)
{
	int error = 0;

	if (mode != inode->i_mode) {
		struct iattr iattr;

		iattr.ia_valid = ATTR_MODE | ATTR_CTIME;
		iattr.ia_mode = mode;
		iattr.ia_ctime = current_fs_time(inode->i_sb);

		error = -xfs_setattr_nonsize(XFS_I(inode), &iattr, XFS_ATTR_NOACL);
	}

	return error;
}

static int
xfs_acl_exists(struct inode *inode, unsigned char *name)
{
	int len = XFS_ACL_MAX_SIZE(XFS_M(inode->i_sb));

	return (xfs_attr_get(XFS_I(inode), name, NULL, &len,
			    ATTR_ROOT|ATTR_KERNOVAL) == 0);
}

int
posix_acl_access_exists(struct inode *inode)
{
	return xfs_acl_exists(inode, SGI_ACL_FILE);
}

int
posix_acl_default_exists(struct inode *inode)
{
	if (!S_ISDIR(inode->i_mode))
		return 0;
	return xfs_acl_exists(inode, SGI_ACL_DEFAULT);
}

/*
 * No need for i_mutex because the inode is not yet exposed to the VFS.
 */
int
xfs_inherit_acl(struct inode *inode, struct posix_acl *acl)
{
	umode_t mode = inode->i_mode;
	int error = 0, inherit = 0;

	if (S_ISDIR(inode->i_mode)) {
		error = xfs_set_acl(inode, ACL_TYPE_DEFAULT, acl);
		if (error)
			goto out;
	}

	error = posix_acl_create(&acl, GFP_KERNEL, &mode);
	if (error < 0)
		return error;

	/*
	 * If posix_acl_create returns a positive value we need to
	 * inherit a permission that can't be represented using the Unix
	 * mode bits and we actually need to set an ACL.
	 */
	if (error > 0)
		inherit = 1;

	error = xfs_set_mode(inode, mode);
	if (error)
		goto out;

	if (inherit)
		error = xfs_set_acl(inode, ACL_TYPE_ACCESS, acl);

out:
	posix_acl_release(acl);
	return error;
}

int
xfs_acl_chmod(struct inode *inode)
{
	struct posix_acl *acl;
	int error;

	if (S_ISLNK(inode->i_mode))
		return -EOPNOTSUPP;

	acl = xfs_get_acl(inode, ACL_TYPE_ACCESS);
	if (IS_ERR(acl) || !acl)
		return PTR_ERR(acl);

	error = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
	if (error)
		return error;

	error = xfs_set_acl(inode, ACL_TYPE_ACCESS, acl);
	posix_acl_release(acl);
	return error;
}

static int
xfs_xattr_acl_get(struct dentry *dentry, const char *name,
		void *value, size_t size, int type)
{
	struct posix_acl *acl;
	int error;

	acl = xfs_get_acl(dentry->d_inode, type);
	if (IS_ERR(acl))
		return PTR_ERR(acl);
	if (acl == NULL)
		return -ENODATA;

	error = posix_acl_to_xattr(&init_user_ns, acl, value, size);
	posix_acl_release(acl);

	return error;
}

static int
xfs_xattr_acl_set(struct dentry *dentry, const char *name,
		const void *value, size_t size, int flags, int type)
{
	struct inode *inode = dentry->d_inode;
	struct posix_acl *acl = NULL;
	int error = 0;

	if (flags & XATTR_CREATE)
		return -EINVAL;
	if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode))
		return value ? -EACCES : 0;
	if ((current_fsuid() != inode->i_uid) && !capable(CAP_FOWNER))
		return -EPERM;

	if (!value)
		goto set_acl;

	acl = posix_acl_from_xattr(&init_user_ns, value, size);
	if (!acl) {
		/*
		 * acl_set_file(3) may request that we set default ACLs with
		 * zero length -- defend (gracefully) against that here.
		 */
		goto out;
	}
	if (IS_ERR(acl)) {
		error = PTR_ERR(acl);
		goto out;
	}

	error = posix_acl_valid(acl);
	if (error)
		goto out_release;

	error = -EINVAL;
	if (acl->a_count > XFS_ACL_MAX_ENTRIES(XFS_M(inode->i_sb)))
		goto out_release;

	if (type == ACL_TYPE_ACCESS) {
		umode_t mode = inode->i_mode;
		error = posix_acl_update_mode(inode, &mode, &acl);

		if (error)
			goto out_release;

		error = xfs_set_mode(inode, mode);
		if (error)
			goto out_release;
	}

 set_acl:
	error = xfs_set_acl(inode, type, acl);
 out_release:
	posix_acl_release(acl);
 out:
	return error;
}

const struct xattr_handler xfs_xattr_acl_access_handler = {
	.prefix	= POSIX_ACL_XATTR_ACCESS,
	.flags	= ACL_TYPE_ACCESS,
	.get	= xfs_xattr_acl_get,
	.set	= xfs_xattr_acl_set,
};

const struct xattr_handler xfs_xattr_acl_default_handler = {
	.prefix	= POSIX_ACL_XATTR_DEFAULT,
	.flags	= ACL_TYPE_DEFAULT,
	.get	= xfs_xattr_acl_get,
	.set	= xfs_xattr_acl_set,
};
Commit	Line	Data
ef14f0c1 CH	1	/*
	2	* Copyright (c) 2008, Christoph Hellwig
	3	* All Rights Reserved.
	4	*
	5	* This program is free software; you can redistribute it and/or
	6	* modify it under the terms of the GNU General Public License as
	7	* published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it would be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write the Free Software Foundation,
	16	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	17	*/
	18	#include "xfs.h"
	19	#include "xfs_acl.h"
	20	#include "xfs_attr.h"
	21	#include "xfs_bmap_btree.h"
	22	#include "xfs_inode.h"
	23	#include "xfs_vnodeops.h"
0a8aa193 DC	24	#include "xfs_sb.h"
0a8aa193 DC	25	#include "xfs_mount.h"
0b1b213f	26	#include "xfs_trace.h"
5a0e3ad6	27	#include <linux/slab.h>
ef14f0c1 CH	28	#include <linux/xattr.h>
	29	#include <linux/posix_acl_xattr.h>
	30
	31
ef14f0c1 CH	32	/*
	33	* Locking scheme:
	34	* - all ACL updates are protected by inode->i_mutex, which is taken before
	35	* calling into this file.
ef14f0c1 CH	36	*/
	37
	38	STATIC struct posix_acl *
0a8aa193 DC	39	xfs_acl_from_disk(
	40	struct xfs_acl *aclp,
	41	int max_entries)
ef14f0c1 CH	42	{
	43	struct posix_acl_entry *acl_e;
	44	struct posix_acl *acl;
	45	struct xfs_acl_entry *ace;
093019cf	46	unsigned int count, i;
ef14f0c1 CH	47
ef14f0c1 CH	48	count = be32_to_cpu(aclp->acl_cnt);
0a8aa193	49	if (count > max_entries)
fa8b18ed	50	return ERR_PTR(-EFSCORRUPTED);
ef14f0c1 CH	51
	52	acl = posix_acl_alloc(count, GFP_KERNEL);
	53	if (!acl)
	54	return ERR_PTR(-ENOMEM);
	55
	56	for (i = 0; i < count; i++) {
	57	acl_e = &acl->a_entries[i];
	58	ace = &aclp->acl_entry[i];
	59
	60	/*
	61	* The tag is 32 bits on disk and 16 bits in core.
	62	*
	63	* Because every access to it goes through the core
	64	* format first this is not a problem.
	65	*/
	66	acl_e->e_tag = be32_to_cpu(ace->ae_tag);
	67	acl_e->e_perm = be16_to_cpu(ace->ae_perm);
	68
	69	switch (acl_e->e_tag) {
	70	case ACL_USER:
	71	case ACL_GROUP:
	72	acl_e->e_id = be32_to_cpu(ace->ae_id);
	73	break;
	74	case ACL_USER_OBJ:
	75	case ACL_GROUP_OBJ:
	76	case ACL_MASK:
	77	case ACL_OTHER:
	78	acl_e->e_id = ACL_UNDEFINED_ID;
	79	break;
	80	default:
	81	goto fail;
	82	}
	83	}
	84	return acl;
	85
	86	fail:
	87	posix_acl_release(acl);
	88	return ERR_PTR(-EINVAL);
	89	}
	90
	91	STATIC void
	92	xfs_acl_to_disk(struct xfs_acl aclp, const struct posix_acl acl)
	93	{
	94	const struct posix_acl_entry *acl_e;
	95	struct xfs_acl_entry *ace;
	96	int i;
	97
	98	aclp->acl_cnt = cpu_to_be32(acl->a_count);
	99	for (i = 0; i < acl->a_count; i++) {
	100	ace = &aclp->acl_entry[i];
	101	acl_e = &acl->a_entries[i];
	102
	103	ace->ae_tag = cpu_to_be32(acl_e->e_tag);
	104	ace->ae_id = cpu_to_be32(acl_e->e_id);
	105	ace->ae_perm = cpu_to_be16(acl_e->e_perm);
	106	}
	107	}
	108
ef14f0c1 CH	109	struct posix_acl *
	110	xfs_get_acl(struct inode *inode, int type)
	111	{
	112	struct xfs_inode *ip = XFS_I(inode);
1cbd20d8	113	struct posix_acl *acl;
ef14f0c1	114	struct xfs_acl *xfs_acl;
a9273ca5	115	unsigned char *ea_name;
ef14f0c1	116	int error;
0a8aa193	117	int len;
ef14f0c1	118
1cbd20d8 AV	119	acl = get_cached_acl(inode, type);
	120	if (acl != ACL_NOT_CACHED)
	121	return acl;
	122
4e34e719 CH	123	trace_xfs_get_acl(ip);
4e34e719 CH	124
ef14f0c1 CH	125	switch (type) {
	126	case ACL_TYPE_ACCESS:
	127	ea_name = SGI_ACL_FILE;
ef14f0c1 CH	128	break;
	129	case ACL_TYPE_DEFAULT:
	130	ea_name = SGI_ACL_DEFAULT;
ef14f0c1 CH	131	break;
ef14f0c1 CH	132	default:
1cbd20d8	133	BUG();
ef14f0c1 CH	134	}
ef14f0c1 CH	135
ef14f0c1 CH	136	/*
	137	* If we have a cached ACLs value just return it, not need to
	138	* go out to the disk.
	139	*/
0a8aa193 DC	140	len = XFS_ACL_MAX_SIZE(ip->i_mount);
0a8aa193 DC	141	xfs_acl = kzalloc(len, GFP_KERNEL);
ef14f0c1 CH	142	if (!xfs_acl)
	143	return ERR_PTR(-ENOMEM);
	144
a9273ca5 DC	145	error = -xfs_attr_get(ip, ea_name, (unsigned char *)xfs_acl,
a9273ca5 DC	146	&len, ATTR_ROOT);
ef14f0c1 CH	147	if (error) {
	148	/*
	149	* If the attribute doesn't exist make sure we have a negative
	150	* cache entry, for any other error assume it is transient and
1cbd20d8	151	* leave the cache entry as ACL_NOT_CACHED.
ef14f0c1 CH	152	*/
	153	if (error == -ENOATTR) {
	154	acl = NULL;
	155	goto out_update_cache;
	156	}
	157	goto out;
	158	}
	159
0a8aa193	160	acl = xfs_acl_from_disk(xfs_acl, XFS_ACL_MAX_ENTRIES(ip->i_mount));
ef14f0c1 CH	161	if (IS_ERR(acl))
	162	goto out;
	163
	164	out_update_cache:
1cbd20d8	165	set_cached_acl(inode, type, acl);
ef14f0c1 CH	166	out:
	167	kfree(xfs_acl);
	168	return acl;
	169	}
	170
	171	STATIC int
	172	xfs_set_acl(struct inode inode, int type, struct posix_acl acl)
	173	{
	174	struct xfs_inode *ip = XFS_I(inode);
a9273ca5	175	unsigned char *ea_name;
ef14f0c1 CH	176	int error;
	177
	178	if (S_ISLNK(inode->i_mode))
	179	return -EOPNOTSUPP;
	180
	181	switch (type) {
	182	case ACL_TYPE_ACCESS:
	183	ea_name = SGI_ACL_FILE;
ef14f0c1 CH	184	break;
	185	case ACL_TYPE_DEFAULT:
	186	if (!S_ISDIR(inode->i_mode))
	187	return acl ? -EACCES : 0;
	188	ea_name = SGI_ACL_DEFAULT;
ef14f0c1 CH	189	break;
	190	default:
	191	return -EINVAL;
	192	}
	193
	194	if (acl) {
	195	struct xfs_acl *xfs_acl;
0a8aa193	196	int len = XFS_ACL_MAX_SIZE(ip->i_mount);
ef14f0c1	197
0a8aa193	198	xfs_acl = kzalloc(len, GFP_KERNEL);
ef14f0c1 CH	199	if (!xfs_acl)
	200	return -ENOMEM;
	201
	202	xfs_acl_to_disk(xfs_acl, acl);
0a8aa193 DC	203
	204	/* subtract away the unused acl entries */
	205	len -= sizeof(struct xfs_acl_entry) *
	206	(XFS_ACL_MAX_ENTRIES(ip->i_mount) - acl->a_count);
ef14f0c1	207
a9273ca5	208	error = -xfs_attr_set(ip, ea_name, (unsigned char *)xfs_acl,
ef14f0c1 CH	209	len, ATTR_ROOT);
	210
	211	kfree(xfs_acl);
	212	} else {
	213	/*
	214	* A NULL ACL argument means we want to remove the ACL.
	215	*/
	216	error = -xfs_attr_remove(ip, ea_name, ATTR_ROOT);
	217
	218	/*
	219	* If the attribute didn't exist to start with that's fine.
	220	*/
	221	if (error == -ENOATTR)
	222	error = 0;
	223	}
	224
	225	if (!error)
1cbd20d8	226	set_cached_acl(inode, type, acl);
ef14f0c1 CH	227	return error;
	228	}
	229
ef14f0c1	230	static int
d3fb6120	231	xfs_set_mode(struct inode *inode, umode_t mode)
ef14f0c1 CH	232	{
	233	int error = 0;
	234
	235	if (mode != inode->i_mode) {
	236	struct iattr iattr;
	237
d6d59bad	238	iattr.ia_valid = ATTR_MODE \| ATTR_CTIME;
ef14f0c1	239	iattr.ia_mode = mode;
d6d59bad	240	iattr.ia_ctime = current_fs_time(inode->i_sb);
ef14f0c1	241
c4ed4243	242	error = -xfs_setattr_nonsize(XFS_I(inode), &iattr, XFS_ATTR_NOACL);
ef14f0c1 CH	243	}
	244
	245	return error;
	246	}
	247
	248	static int
a9273ca5	249	xfs_acl_exists(struct inode inode, unsigned char name)
ef14f0c1	250	{
0a8aa193	251	int len = XFS_ACL_MAX_SIZE(XFS_M(inode->i_sb));
ef14f0c1 CH	252
	253	return (xfs_attr_get(XFS_I(inode), name, NULL, &len,
	254	ATTR_ROOT\|ATTR_KERNOVAL) == 0);
	255	}
	256
	257	int
	258	posix_acl_access_exists(struct inode *inode)
	259	{
	260	return xfs_acl_exists(inode, SGI_ACL_FILE);
	261	}
	262
	263	int
	264	posix_acl_default_exists(struct inode *inode)
	265	{
	266	if (!S_ISDIR(inode->i_mode))
	267	return 0;
	268	return xfs_acl_exists(inode, SGI_ACL_DEFAULT);
	269	}
	270
	271	/*
	272	* No need for i_mutex because the inode is not yet exposed to the VFS.
	273	*/
	274	int
826cae2f	275	xfs_inherit_acl(struct inode inode, struct posix_acl acl)
ef14f0c1	276	{
d3fb6120	277	umode_t mode = inode->i_mode;
ef14f0c1 CH	278	int error = 0, inherit = 0;
	279
	280	if (S_ISDIR(inode->i_mode)) {
826cae2f	281	error = xfs_set_acl(inode, ACL_TYPE_DEFAULT, acl);
ef14f0c1	282	if (error)
826cae2f	283	goto out;
ef14f0c1 CH	284	}
ef14f0c1 CH	285
826cae2f	286	error = posix_acl_create(&acl, GFP_KERNEL, &mode);
ef14f0c1	287	if (error < 0)
826cae2f	288	return error;
ef14f0c1 CH	289
ef14f0c1 CH	290	/*
826cae2f	291	* If posix_acl_create returns a positive value we need to
ef14f0c1 CH	292	* inherit a permission that can't be represented using the Unix
	293	* mode bits and we actually need to set an ACL.
	294	*/
	295	if (error > 0)
	296	inherit = 1;
	297
	298	error = xfs_set_mode(inode, mode);
	299	if (error)
826cae2f	300	goto out;
ef14f0c1 CH	301
ef14f0c1 CH	302	if (inherit)
826cae2f	303	error = xfs_set_acl(inode, ACL_TYPE_ACCESS, acl);
ef14f0c1	304
826cae2f AV	305	out:
826cae2f AV	306	posix_acl_release(acl);
ef14f0c1 CH	307	return error;
	308	}
	309
	310	int
	311	xfs_acl_chmod(struct inode *inode)
	312	{
bc26ab5f	313	struct posix_acl *acl;
ef14f0c1 CH	314	int error;
	315
	316	if (S_ISLNK(inode->i_mode))
	317	return -EOPNOTSUPP;
	318
	319	acl = xfs_get_acl(inode, ACL_TYPE_ACCESS);
	320	if (IS_ERR(acl) \|\| !acl)
	321	return PTR_ERR(acl);
	322
bc26ab5f AV	323	error = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
	324	if (error)
	325	return error;
ef14f0c1	326
bc26ab5f AV	327	error = xfs_set_acl(inode, ACL_TYPE_ACCESS, acl);
bc26ab5f AV	328	posix_acl_release(acl);
ef14f0c1 CH	329	return error;
	330	}
	331
ef14f0c1	332	static int
431547b3 CH	333	xfs_xattr_acl_get(struct dentry dentry, const char name,
431547b3 CH	334	void *value, size_t size, int type)
ef14f0c1 CH	335	{
ef14f0c1 CH	336	struct posix_acl *acl;
431547b3	337	int error;
ef14f0c1	338
431547b3	339	acl = xfs_get_acl(dentry->d_inode, type);
ef14f0c1 CH	340	if (IS_ERR(acl))
	341	return PTR_ERR(acl);
	342	if (acl == NULL)
	343	return -ENODATA;
	344
5f3a4a28	345	error = posix_acl_to_xattr(&init_user_ns, acl, value, size);
ef14f0c1 CH	346	posix_acl_release(acl);
	347
	348	return error;
	349	}
	350
	351	static int
431547b3 CH	352	xfs_xattr_acl_set(struct dentry dentry, const char name,
431547b3 CH	353	const void *value, size_t size, int flags, int type)
ef14f0c1	354	{
431547b3	355	struct inode *inode = dentry->d_inode;
ef14f0c1	356	struct posix_acl *acl = NULL;
431547b3	357	int error = 0;
ef14f0c1	358
ef14f0c1 CH	359	if (flags & XATTR_CREATE)
	360	return -EINVAL;
	361	if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode))
	362	return value ? -EACCES : 0;
	363	if ((current_fsuid() != inode->i_uid) && !capable(CAP_FOWNER))
	364	return -EPERM;
	365
	366	if (!value)
	367	goto set_acl;
	368
5f3a4a28	369	acl = posix_acl_from_xattr(&init_user_ns, value, size);
ef14f0c1 CH	370	if (!acl) {
	371	/*
	372	* acl_set_file(3) may request that we set default ACLs with
	373	* zero length -- defend (gracefully) against that here.
	374	*/
	375	goto out;
	376	}
	377	if (IS_ERR(acl)) {
	378	error = PTR_ERR(acl);
	379	goto out;
	380	}
	381
	382	error = posix_acl_valid(acl);
	383	if (error)
	384	goto out_release;
	385
	386	error = -EINVAL;
0a8aa193	387	if (acl->a_count > XFS_ACL_MAX_ENTRIES(XFS_M(inode->i_sb)))
ef14f0c1 CH	388	goto out_release;
	389
	390	if (type == ACL_TYPE_ACCESS) {
d6952123	391	umode_t mode = inode->i_mode;
4b9e9796	392	error = posix_acl_update_mode(inode, &mode, &acl);
ef14f0c1	393
4b9e9796 S	394	if (error)
4b9e9796 S	395	goto out_release;
ef14f0c1 CH	396
	397	error = xfs_set_mode(inode, mode);
	398	if (error)
	399	goto out_release;
	400	}
	401
	402	set_acl:
	403	error = xfs_set_acl(inode, type, acl);
	404	out_release:
	405	posix_acl_release(acl);
	406	out:
	407	return error;
	408	}
	409
46e58764	410	const struct xattr_handler xfs_xattr_acl_access_handler = {
431547b3 CH	411	.prefix = POSIX_ACL_XATTR_ACCESS,
	412	.flags = ACL_TYPE_ACCESS,
	413	.get = xfs_xattr_acl_get,
	414	.set = xfs_xattr_acl_set,
	415	};
	416
46e58764	417	const struct xattr_handler xfs_xattr_acl_default_handler = {
431547b3 CH	418	.prefix = POSIX_ACL_XATTR_DEFAULT,
	419	.flags = ACL_TYPE_DEFAULT,
	420	.get = xfs_xattr_acl_get,
	421	.set = xfs_xattr_acl_set,
ef14f0c1	422	};