[mirror_ubuntu-bionic-kernel.git] / fs / cifs / xattr.c

/*
 *   fs/cifs/xattr.c
 *
 *   Copyright (c) International Business Machines  Corp., 2003, 2007
 *   Author(s): Steve French (sfrench@us.ibm.com)
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/fs.h>
#include <linux/posix_acl_xattr.h>
#include <linux/slab.h>
#include <linux/xattr.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
#include "cifs_unicode.h"

#define MAX_EA_VALUE_SIZE 65535
#define CIFS_XATTR_CIFS_ACL "system.cifs_acl"
#define CIFS_XATTR_ATTRIB "cifs.dosattrib"  /* full name: user.cifs.dosattrib */
#define CIFS_XATTR_CREATETIME "cifs.creationtime"  /* user.cifs.creationtime */
/* BB need to add server (Samba e.g) support for security and trusted prefix */

enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT };

static int cifs_xattr_set(const struct xattr_handler *handler,
			  struct dentry *dentry, struct inode *inode,
			  const char *name, const void *value,
			  size_t size, int flags)
{
	int rc = -EOPNOTSUPP;
	unsigned int xid;
	struct super_block *sb = dentry->d_sb;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	char *full_path;

	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
	pTcon = tlink_tcon(tlink);

	xid = get_xid();

	full_path = build_path_from_dentry(dentry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto out;
	}
	/* return dos attributes as pseudo xattr */
	/* return alt name if available as pseudo attr */

	/* if proc/fs/cifs/streamstoxattr is set then
		search server for EAs or streams to
		returns as xattrs */
	if (size > MAX_EA_VALUE_SIZE) {
		cifs_dbg(FYI, "size of EA value too large\n");
		rc = -EOPNOTSUPP;
		goto out;
	}

	switch (handler->flags) {
	case XATTR_USER:
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto out;

		if (pTcon->ses->server->ops->set_EA)
			rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
				full_path, name, value, (__u16)size,
				cifs_sb->local_nls, cifs_remap(cifs_sb));
		break;

	case XATTR_CIFS_ACL: {
#ifdef CONFIG_CIFS_ACL
		struct cifs_ntsd *pacl;

		if (!value)
			goto out;
		pacl = kmalloc(size, GFP_KERNEL);
		if (!pacl) {
			rc = -ENOMEM;
		} else {
			memcpy(pacl, value, size);
			if (value &&
			    pTcon->ses->server->ops->set_acl)
				rc = pTcon->ses->server->ops->set_acl(pacl,
						size, inode,
						full_path, CIFS_ACL_DACL);
			else
				rc = -EOPNOTSUPP;
			if (rc == 0) /* force revalidate of the inode */
				CIFS_I(inode)->time = 0;
			kfree(pacl);
		}
#endif /* CONFIG_CIFS_ACL */
		break;
	}

	case XATTR_ACL_ACCESS:
#ifdef CONFIG_CIFS_POSIX
		if (!value)
			goto out;
		if (sb->s_flags & MS_POSIXACL)
			rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
				value, (const int)size,
				ACL_TYPE_ACCESS, cifs_sb->local_nls,
				cifs_remap(cifs_sb));
#endif  /* CONFIG_CIFS_POSIX */
		break;

	case XATTR_ACL_DEFAULT:
#ifdef CONFIG_CIFS_POSIX
		if (!value)
			goto out;
		if (sb->s_flags & MS_POSIXACL)
			rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
				value, (const int)size,
				ACL_TYPE_DEFAULT, cifs_sb->local_nls,
				cifs_remap(cifs_sb));
#endif  /* CONFIG_CIFS_POSIX */
		break;
	}

out:
	kfree(full_path);
	free_xid(xid);
	cifs_put_tlink(tlink);
	return rc;
}

static int cifs_attrib_get(struct dentry *dentry,
			   struct inode *inode, void *value,
			   size_t size)
{
	ssize_t rc;
	__u32 *pattribute;

	rc = cifs_revalidate_dentry_attr(dentry);

	if (rc)
		return rc;

	if ((value == NULL) || (size == 0))
		return sizeof(__u32);
	else if (size < sizeof(__u32))
		return -ERANGE;

	/* return dos attributes as pseudo xattr */
	pattribute = (__u32 *)value;
	*pattribute = CIFS_I(inode)->cifsAttrs;

	return sizeof(__u32);
}

static int cifs_creation_time_get(struct dentry *dentry, struct inode *inode,
				  void *value, size_t size)
{
	ssize_t rc;
	__u64 * pcreatetime;

	rc = cifs_revalidate_dentry_attr(dentry);
	if (rc)
		return rc;

	if ((value == NULL) || (size == 0))
		return sizeof(__u64);
	else if (size < sizeof(__u64))
		return -ERANGE;

	/* return dos attributes as pseudo xattr */
	pcreatetime = (__u64 *)value;
	*pcreatetime = CIFS_I(inode)->createtime;
	return sizeof(__u64);

	return rc;
}


static int cifs_xattr_get(const struct xattr_handler *handler,
			  struct dentry *dentry, struct inode *inode,
			  const char *name, void *value, size_t size)
{
	ssize_t rc = -EOPNOTSUPP;
	unsigned int xid;
	struct super_block *sb = dentry->d_sb;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	char *full_path;

	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
	pTcon = tlink_tcon(tlink);

	xid = get_xid();

	full_path = build_path_from_dentry(dentry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto out;
	}

	/* return alt name if available as pseudo attr */
	switch (handler->flags) {
	case XATTR_USER:
		cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name);
		if (strcmp(name, CIFS_XATTR_ATTRIB) == 0) {
			rc = cifs_attrib_get(dentry, inode, value, size);
			break;
		} else if (strcmp(name, CIFS_XATTR_CREATETIME) == 0) {
			rc = cifs_creation_time_get(dentry, inode, value, size);
			break;
		}

		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto out;

		if (pTcon->ses->server->ops->query_all_EAs)
			rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
				full_path, name, value, size,
				cifs_sb->local_nls, cifs_remap(cifs_sb));
		break;

	case XATTR_CIFS_ACL: {
#ifdef CONFIG_CIFS_ACL
		u32 acllen;
		struct cifs_ntsd *pacl;

		if (pTcon->ses->server->ops->get_acl == NULL)
			goto out; /* rc already EOPNOTSUPP */

		pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
				inode, full_path, &acllen);
		if (IS_ERR(pacl)) {
			rc = PTR_ERR(pacl);
			cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
				 __func__, rc);
		} else {
			if (value) {
				if (acllen > size)
					acllen = -ERANGE;
				else
					memcpy(value, pacl, acllen);
			}
			rc = acllen;
			kfree(pacl);
		}
#endif  /* CONFIG_CIFS_ACL */
		break;
	}

	case XATTR_ACL_ACCESS:
#ifdef CONFIG_CIFS_POSIX
		if (sb->s_flags & MS_POSIXACL)
			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
				value, size, ACL_TYPE_ACCESS,
				cifs_sb->local_nls,
				cifs_remap(cifs_sb));
#endif  /* CONFIG_CIFS_POSIX */
		break;

	case XATTR_ACL_DEFAULT:
#ifdef CONFIG_CIFS_POSIX
		if (sb->s_flags & MS_POSIXACL)
			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
				value, size, ACL_TYPE_DEFAULT,
				cifs_sb->local_nls,
				cifs_remap(cifs_sb));
#endif  /* CONFIG_CIFS_POSIX */
		break;
	}

	/* We could add an additional check for streams ie
	    if proc/fs/cifs/streamstoxattr is set then
		search server for EAs or streams to
		returns as xattrs */

	if (rc == -EINVAL)
		rc = -EOPNOTSUPP;

out:
	kfree(full_path);
	free_xid(xid);
	cifs_put_tlink(tlink);
	return rc;
}

ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
{
	ssize_t rc = -EOPNOTSUPP;
	unsigned int xid;
	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	char *full_path;

	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
		return -EOPNOTSUPP;

	tlink = cifs_sb_tlink(cifs_sb);
	if (IS_ERR(tlink))
		return PTR_ERR(tlink);
	pTcon = tlink_tcon(tlink);

	xid = get_xid();

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto list_ea_exit;
	}
	/* return dos attributes as pseudo xattr */
	/* return alt name if available as pseudo attr */

	/* if proc/fs/cifs/streamstoxattr is set then
		search server for EAs or streams to
		returns as xattrs */

	if (pTcon->ses->server->ops->query_all_EAs)
		rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
				full_path, NULL, data, buf_size,
				cifs_sb->local_nls, cifs_remap(cifs_sb));
list_ea_exit:
	kfree(full_path);
	free_xid(xid);
	cifs_put_tlink(tlink);
	return rc;
}

static const struct xattr_handler cifs_user_xattr_handler = {
	.prefix = XATTR_USER_PREFIX,
	.flags = XATTR_USER,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

/* os2.* attributes are treated like user.* attributes */
static const struct xattr_handler cifs_os2_xattr_handler = {
	.prefix = XATTR_OS2_PREFIX,
	.flags = XATTR_USER,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

static const struct xattr_handler cifs_cifs_acl_xattr_handler = {
	.name = CIFS_XATTR_CIFS_ACL,
	.flags = XATTR_CIFS_ACL,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

static const struct xattr_handler cifs_posix_acl_access_xattr_handler = {
	.name = XATTR_NAME_POSIX_ACL_ACCESS,
	.flags = XATTR_ACL_ACCESS,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

static const struct xattr_handler cifs_posix_acl_default_xattr_handler = {
	.name = XATTR_NAME_POSIX_ACL_DEFAULT,
	.flags = XATTR_ACL_DEFAULT,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

const struct xattr_handler *cifs_xattr_handlers[] = {
	&cifs_user_xattr_handler,
	&cifs_os2_xattr_handler,
	&cifs_cifs_acl_xattr_handler,
	&cifs_posix_acl_access_xattr_handler,
	&cifs_posix_acl_default_xattr_handler,
	NULL
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* fs/cifs/xattr.c
	3	*
79a58d1f	4	* Copyright (c) International Business Machines Corp., 2003, 2007
1da177e4 LT	5	* Author(s): Steve French (sfrench@us.ibm.com)
	6	*
	7	* This library is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU Lesser General Public License as published
	9	* by the Free Software Foundation; either version 2.1 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This library is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	15	* the GNU Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public License
	18	* along with this library; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*/
	21
	22	#include <linux/fs.h>
	23	#include <linux/posix_acl_xattr.h>
5a0e3ad6	24	#include <linux/slab.h>
f995e740	25	#include <linux/xattr.h>
1da177e4 LT	26	#include "cifsfs.h"
	27	#include "cifspdu.h"
	28	#include "cifsglob.h"
	29	#include "cifsproto.h"
	30	#include "cifs_debug.h"
2baa2682 SF	31	#include "cifs_fs_sb.h"
2baa2682 SF	32	#include "cifs_unicode.h"
1da177e4 LT	33
1da177e4 LT	34	#define MAX_EA_VALUE_SIZE 65535
fbeba8bb	35	#define CIFS_XATTR_CIFS_ACL "system.cifs_acl"
a958fff2	36	#define CIFS_XATTR_ATTRIB "cifs.dosattrib" /* full name: user.cifs.dosattrib */
66098044	37	#define CIFS_XATTR_CREATETIME "cifs.creationtime" /* user.cifs.creationtime */
f995e740	38	/* BB need to add server (Samba e.g) support for security and trusted prefix */
1da177e4	39
a9ae008f	40	enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT };
7ffec372	41
a9ae008f	42	static int cifs_xattr_set(const struct xattr_handler *handler,
59301226 AV	43	struct dentry dentry, struct inode inode,
	44	const char name, const void value,
	45	size_t size, int flags)
1da177e4 LT	46	{
1da177e4 LT	47	int rc = -EOPNOTSUPP;
6d5786a3	48	unsigned int xid;
a9ae008f	49	struct super_block *sb = dentry->d_sb;
5fdccfef	50	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
7ffec372	51	struct tcon_link *tlink;
96daf2b0	52	struct cifs_tcon *pTcon;
79a58d1f	53	char *full_path;
1da177e4	54
7ffec372 JL	55	tlink = cifs_sb_tlink(cifs_sb);
	56	if (IS_ERR(tlink))
	57	return PTR_ERR(tlink);
	58	pTcon = tlink_tcon(tlink);
	59
6d5786a3	60	xid = get_xid();
1da177e4	61
a9ae008f	62	full_path = build_path_from_dentry(dentry);
79a58d1f	63	if (full_path == NULL) {
0f3bc09e	64	rc = -ENOMEM;
a9ae008f	65	goto out;
1da177e4 LT	66	}
	67	/* return dos attributes as pseudo xattr */
	68	/* return alt name if available as pseudo attr */
	69
	70	/* if proc/fs/cifs/streamstoxattr is set then
79a58d1f	71	search server for EAs or streams to
1da177e4	72	returns as xattrs */
a9ae008f	73	if (size > MAX_EA_VALUE_SIZE) {
f96637be	74	cifs_dbg(FYI, "size of EA value too large\n");
7ffec372	75	rc = -EOPNOTSUPP;
a9ae008f	76	goto out;
1da177e4 LT	77	}
1da177e4 LT	78
a9ae008f AG	79	switch (handler->flags) {
a9ae008f AG	80	case XATTR_USER:
79a58d1f	81	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
a9ae008f	82	goto out;
ad7a2926	83
666753c3 SF	84	if (pTcon->ses->server->ops->set_EA)
666753c3 SF	85	rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
a9ae008f	86	full_path, name, value, (__u16)size,
2baa2682	87	cifs_sb->local_nls, cifs_remap(cifs_sb));
a9ae008f	88	break;
1da177e4	89
a9ae008f	90	case XATTR_CIFS_ACL: {
b0f8ef20 SN	91	#ifdef CONFIG_CIFS_ACL
b0f8ef20 SN	92	struct cifs_ntsd *pacl;
a9ae008f AG	93
	94	if (!value)
	95	goto out;
	96	pacl = kmalloc(size, GFP_KERNEL);
b73b9a4b	97	if (!pacl) {
b73b9a4b SF	98	rc = -ENOMEM;
b73b9a4b SF	99	} else {
a9ae008f AG	100	memcpy(pacl, value, size);
	101	if (value &&
	102	pTcon->ses->server->ops->set_acl)
83e3bc23	103	rc = pTcon->ses->server->ops->set_acl(pacl,
59301226	104	size, inode,
83e3bc23 SF	105	full_path, CIFS_ACL_DACL);
	106	else
	107	rc = -EOPNOTSUPP;
b73b9a4b	108	if (rc == 0) /* force revalidate of the inode */
59301226	109	CIFS_I(inode)->time = 0;
b73b9a4b	110	kfree(pacl);
b0f8ef20	111	}
b73b9a4b	112	#endif /* CONFIG_CIFS_ACL */
a9ae008f AG	113	break;
	114	}
	115
	116	case XATTR_ACL_ACCESS:
1da177e4	117	#ifdef CONFIG_CIFS_POSIX
a9ae008f AG	118	if (!value)
	119	goto out;
	120	if (sb->s_flags & MS_POSIXACL)
	121	rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
	122	value, (const int)size,
	123	ACL_TYPE_ACCESS, cifs_sb->local_nls,
	124	cifs_remap(cifs_sb));
	125	#endif /* CONFIG_CIFS_POSIX */
	126	break;
	127
	128	case XATTR_ACL_DEFAULT:
1da177e4	129	#ifdef CONFIG_CIFS_POSIX
a9ae008f AG	130	if (!value)
	131	goto out;
	132	if (sb->s_flags & MS_POSIXACL)
	133	rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
	134	value, (const int)size,
	135	ACL_TYPE_DEFAULT, cifs_sb->local_nls,
	136	cifs_remap(cifs_sb));
	137	#endif /* CONFIG_CIFS_POSIX */
	138	break;
1da177e4 LT	139	}
1da177e4 LT	140
a9ae008f	141	out:
f99d49ad	142	kfree(full_path);
6d5786a3	143	free_xid(xid);
7ffec372	144	cifs_put_tlink(tlink);
1da177e4 LT	145	return rc;
	146	}
	147
a958fff2 SF	148	static int cifs_attrib_get(struct dentry *dentry,
	149	struct inode inode, void value,
	150	size_t size)
	151	{
	152	ssize_t rc;
	153	__u32 *pattribute;
	154
	155	rc = cifs_revalidate_dentry_attr(dentry);
	156
	157	if (rc)
	158	return rc;
	159
	160	if ((value == NULL) \|\| (size == 0))
	161	return sizeof(__u32);
	162	else if (size < sizeof(__u32))
	163	return -ERANGE;
	164
	165	/* return dos attributes as pseudo xattr */
	166	pattribute = (__u32 *)value;
	167	*pattribute = CIFS_I(inode)->cifsAttrs;
	168
	169	return sizeof(__u32);
	170	}
	171
66098044 SF	172	static int cifs_creation_time_get(struct dentry dentry, struct inode inode,
	173	void *value, size_t size)
	174	{
	175	ssize_t rc;
	176	__u64 * pcreatetime;
	177
	178	rc = cifs_revalidate_dentry_attr(dentry);
	179	if (rc)
	180	return rc;
	181
	182	if ((value == NULL) \|\| (size == 0))
	183	return sizeof(__u64);
	184	else if (size < sizeof(__u64))
	185	return -ERANGE;
	186
	187	/* return dos attributes as pseudo xattr */
	188	pcreatetime = (__u64 *)value;
	189	*pcreatetime = CIFS_I(inode)->createtime;
	190	return sizeof(__u64);
	191
	192	return rc;
	193	}
	194
a958fff2	195
a9ae008f AG	196	static int cifs_xattr_get(const struct xattr_handler *handler,
	197	struct dentry dentry, struct inode inode,
	198	const char name, void value, size_t size)
1da177e4 LT	199	{
1da177e4 LT	200	ssize_t rc = -EOPNOTSUPP;
6d5786a3	201	unsigned int xid;
a9ae008f	202	struct super_block *sb = dentry->d_sb;
5fdccfef	203	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
7ffec372	204	struct tcon_link *tlink;
96daf2b0	205	struct cifs_tcon *pTcon;
79a58d1f	206	char *full_path;
1da177e4	207
7ffec372 JL	208	tlink = cifs_sb_tlink(cifs_sb);
	209	if (IS_ERR(tlink))
	210	return PTR_ERR(tlink);
	211	pTcon = tlink_tcon(tlink);
	212
6d5786a3	213	xid = get_xid();
1da177e4	214
a9ae008f	215	full_path = build_path_from_dentry(dentry);
79a58d1f	216	if (full_path == NULL) {
0f3bc09e	217	rc = -ENOMEM;
a9ae008f	218	goto out;
1da177e4	219	}
a958fff2	220
1da177e4	221	/* return alt name if available as pseudo attr */
a9ae008f AG	222	switch (handler->flags) {
a9ae008f AG	223	case XATTR_USER:
a958fff2 SF	224	cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name);
	225	if (strcmp(name, CIFS_XATTR_ATTRIB) == 0) {
	226	rc = cifs_attrib_get(dentry, inode, value, size);
	227	break;
66098044 SF	228	} else if (strcmp(name, CIFS_XATTR_CREATETIME) == 0) {
	229	rc = cifs_creation_time_get(dentry, inode, value, size);
	230	break;
a958fff2 SF	231	}
a958fff2 SF	232
79a58d1f	233	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
a9ae008f	234	goto out;
1da177e4	235
666753c3 SF	236	if (pTcon->ses->server->ops->query_all_EAs)
666753c3 SF	237	rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
a9ae008f	238	full_path, name, value, size,
2baa2682	239	cifs_sb->local_nls, cifs_remap(cifs_sb));
a9ae008f	240	break;
1da177e4	241
a9ae008f AG	242	case XATTR_CIFS_ACL: {
	243	#ifdef CONFIG_CIFS_ACL
	244	u32 acllen;
	245	struct cifs_ntsd *pacl;
	246
	247	if (pTcon->ses->server->ops->get_acl == NULL)
	248	goto out; /* rc already EOPNOTSUPP */
	249
	250	pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
	251	inode, full_path, &acllen);
	252	if (IS_ERR(pacl)) {
	253	rc = PTR_ERR(pacl);
	254	cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
	255	__func__, rc);
	256	} else {
	257	if (value) {
	258	if (acllen > size)
	259	acllen = -ERANGE;
	260	else
	261	memcpy(value, pacl, acllen);
	262	}
	263	rc = acllen;
	264	kfree(pacl);
	265	}
	266	#endif /* CONFIG_CIFS_ACL */
	267	break;
	268	}
	269
	270	case XATTR_ACL_ACCESS:
1da177e4	271	#ifdef CONFIG_CIFS_POSIX
79a58d1f	272	if (sb->s_flags & MS_POSIXACL)
1da0c78b	273	rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
a9ae008f	274	value, size, ACL_TYPE_ACCESS,
737b758c	275	cifs_sb->local_nls,
2baa2682	276	cifs_remap(cifs_sb));
a9ae008f AG	277	#endif /* CONFIG_CIFS_POSIX */
	278	break;
	279
	280	case XATTR_ACL_DEFAULT:
1da177e4	281	#ifdef CONFIG_CIFS_POSIX
79a58d1f	282	if (sb->s_flags & MS_POSIXACL)
1da0c78b	283	rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
a9ae008f	284	value, size, ACL_TYPE_DEFAULT,
737b758c	285	cifs_sb->local_nls,
2baa2682	286	cifs_remap(cifs_sb));
a9ae008f AG	287	#endif /* CONFIG_CIFS_POSIX */
	288	break;
	289	}
1da177e4	290
79a58d1f	291	/* We could add an additional check for streams ie
1da177e4	292	if proc/fs/cifs/streamstoxattr is set then
79a58d1f	293	search server for EAs or streams to
1da177e4 LT	294	returns as xattrs */
1da177e4 LT	295
79a58d1f SF	296	if (rc == -EINVAL)
79a58d1f SF	297	rc = -EOPNOTSUPP;
1da177e4	298
a9ae008f	299	out:
f99d49ad	300	kfree(full_path);
6d5786a3	301	free_xid(xid);
7ffec372	302	cifs_put_tlink(tlink);
1da177e4 LT	303	return rc;
	304	}
	305
79a58d1f	306	ssize_t cifs_listxattr(struct dentry direntry, char data, size_t buf_size)
1da177e4 LT	307	{
1da177e4 LT	308	ssize_t rc = -EOPNOTSUPP;
6d5786a3	309	unsigned int xid;
5fdccfef	310	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
7ffec372	311	struct tcon_link *tlink;
96daf2b0	312	struct cifs_tcon *pTcon;
79a58d1f	313	char *full_path;
1da177e4	314
79a58d1f	315	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
ea4c07d7 SF	316	return -EOPNOTSUPP;
ea4c07d7 SF	317
7ffec372 JL	318	tlink = cifs_sb_tlink(cifs_sb);
	319	if (IS_ERR(tlink))
	320	return PTR_ERR(tlink);
	321	pTcon = tlink_tcon(tlink);
	322
6d5786a3	323	xid = get_xid();
ea4c07d7	324
1da177e4	325	full_path = build_path_from_dentry(direntry);
79a58d1f	326	if (full_path == NULL) {
0f3bc09e	327	rc = -ENOMEM;
7ffec372	328	goto list_ea_exit;
1da177e4 LT	329	}
	330	/* return dos attributes as pseudo xattr */
	331	/* return alt name if available as pseudo attr */
	332
	333	/* if proc/fs/cifs/streamstoxattr is set then
79a58d1f	334	search server for EAs or streams to
1da177e4	335	returns as xattrs */
1da177e4	336
666753c3 SF	337	if (pTcon->ses->server->ops->query_all_EAs)
	338	rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
	339	full_path, NULL, data, buf_size,
2baa2682	340	cifs_sb->local_nls, cifs_remap(cifs_sb));
7ffec372	341	list_ea_exit:
f99d49ad	342	kfree(full_path);
6d5786a3	343	free_xid(xid);
7ffec372	344	cifs_put_tlink(tlink);
1da177e4 LT	345	return rc;
1da177e4 LT	346	}
a9ae008f AG	347
	348	static const struct xattr_handler cifs_user_xattr_handler = {
	349	.prefix = XATTR_USER_PREFIX,
	350	.flags = XATTR_USER,
	351	.get = cifs_xattr_get,
	352	.set = cifs_xattr_set,
	353	};
	354
	355	/* os2.* attributes are treated like user.* attributes */
	356	static const struct xattr_handler cifs_os2_xattr_handler = {
	357	.prefix = XATTR_OS2_PREFIX,
	358	.flags = XATTR_USER,
	359	.get = cifs_xattr_get,
	360	.set = cifs_xattr_set,
	361	};
	362
	363	static const struct xattr_handler cifs_cifs_acl_xattr_handler = {
	364	.name = CIFS_XATTR_CIFS_ACL,
	365	.flags = XATTR_CIFS_ACL,
	366	.get = cifs_xattr_get,
	367	.set = cifs_xattr_set,
	368	};
	369
	370	static const struct xattr_handler cifs_posix_acl_access_xattr_handler = {
	371	.name = XATTR_NAME_POSIX_ACL_ACCESS,
	372	.flags = XATTR_ACL_ACCESS,
	373	.get = cifs_xattr_get,
	374	.set = cifs_xattr_set,
	375	};
	376
	377	static const struct xattr_handler cifs_posix_acl_default_xattr_handler = {
	378	.name = XATTR_NAME_POSIX_ACL_DEFAULT,
	379	.flags = XATTR_ACL_DEFAULT,
	380	.get = cifs_xattr_get,
	381	.set = cifs_xattr_set,
	382	};
	383
	384	const struct xattr_handler *cifs_xattr_handlers[] = {
	385	&cifs_user_xattr_handler,
	386	&cifs_os2_xattr_handler,
	387	&cifs_cifs_acl_xattr_handler,
	388	&cifs_posix_acl_access_xattr_handler,
	389	&cifs_posix_acl_default_xattr_handler,
	390	NULL
	391	};