[mirror_ubuntu-jammy-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 CIFSMaxBufSize
#define CIFS_XATTR_CIFS_ACL "system.cifs_acl" /* DACL only */
#define CIFS_XATTR_CIFS_NTSD "system.cifs_ntsd" /* owner plus DACL */
#define CIFS_XATTR_CIFS_NTSD_FULL "system.cifs_ntsd_full" /* owner/DACL/SACL */
#define CIFS_XATTR_ATTRIB "cifs.dosattrib"  /* full name: user.cifs.dosattrib */
#define CIFS_XATTR_CREATETIME "cifs.creationtime"  /* user.cifs.creationtime */
/*
 * Although these three are just aliases for the above, need to move away from
 * confusing users and using the 20+ year old term 'cifs' when it is no longer
 * secure, replaced by SMB2 (then even more highly secure SMB3) many years ago
 */
#define SMB3_XATTR_CIFS_ACL "system.smb3_acl" /* DACL only */
#define SMB3_XATTR_CIFS_NTSD "system.smb3_ntsd" /* owner plus DACL */
#define SMB3_XATTR_CIFS_NTSD_FULL "system.smb3_ntsd_full" /* owner/DACL/SACL */
#define SMB3_XATTR_ATTRIB "smb3.dosattrib"  /* full name: user.smb3.dosattrib */
#define SMB3_XATTR_CREATETIME "smb3.creationtime"  /* user.smb3.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,
	XATTR_CIFS_NTSD, XATTR_CIFS_NTSD_FULL };

static int cifs_attrib_set(unsigned int xid, struct cifs_tcon *pTcon,
			   struct inode *inode, char *full_path,
			   const void *value, size_t size)
{
	ssize_t rc = -EOPNOTSUPP;
	__u32 *pattrib = (__u32 *)value;
	__u32 attrib;
	FILE_BASIC_INFO info_buf;

	if ((value == NULL) || (size != sizeof(__u32)))
		return -ERANGE;

	memset(&info_buf, 0, sizeof(info_buf));
	attrib = *pattrib;
	info_buf.Attributes = cpu_to_le32(attrib);
	if (pTcon->ses->server->ops->set_file_info)
		rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
				&info_buf, xid);
	if (rc == 0)
		CIFS_I(inode)->cifsAttrs = attrib;

	return rc;
}

static int cifs_creation_time_set(unsigned int xid, struct cifs_tcon *pTcon,
				  struct inode *inode, char *full_path,
				  const void *value, size_t size)
{
	ssize_t rc = -EOPNOTSUPP;
	__u64 *pcreation_time = (__u64 *)value;
	__u64 creation_time;
	FILE_BASIC_INFO info_buf;

	if ((value == NULL) || (size != sizeof(__u64)))
		return -ERANGE;

	memset(&info_buf, 0, sizeof(info_buf));
	creation_time = *pcreation_time;
	info_buf.CreationTime = cpu_to_le64(creation_time);
	if (pTcon->ses->server->ops->set_file_info)
		rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
				&info_buf, xid);
	if (rc == 0)
		CIFS_I(inode)->createtime = creation_time;

	return rc;
}

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:
		cifs_dbg(FYI, "%s:setting user xattr %s\n", __func__, name);
		if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) ||
		    (strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
			rc = cifs_attrib_set(xid, pTcon, inode, full_path,
					value, size);
			if (rc == 0) /* force revalidate of the inode */
				CIFS_I(inode)->time = 0;
			break;
		} else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) ||
			   (strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
			rc = cifs_creation_time_set(xid, pTcon, inode,
					full_path, value, size);
			if (rc == 0) /* force revalidate of the inode */
				CIFS_I(inode)->time = 0;
			break;
		}

		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_sb);
		break;

	case XATTR_CIFS_ACL:
	case XATTR_CIFS_NTSD:
	case XATTR_CIFS_NTSD_FULL: {
		struct cifs_ntsd *pacl;

		if (!value)
			goto out;
		pacl = kmalloc(size, GFP_KERNEL);
		if (!pacl) {
			rc = -ENOMEM;
		} else {
			memcpy(pacl, value, size);
			if (pTcon->ses->server->ops->set_acl) {
				int aclflags = 0;
				rc = 0;

				switch (handler->flags) {
				case XATTR_CIFS_NTSD_FULL:
					aclflags = (CIFS_ACL_OWNER |
						    CIFS_ACL_DACL |
						    CIFS_ACL_SACL);
					break;
				case XATTR_CIFS_NTSD:
					aclflags = (CIFS_ACL_OWNER |
						    CIFS_ACL_DACL);
					break;
				case XATTR_CIFS_ACL:
				default:
					aclflags = CIFS_ACL_DACL;
				}

				rc = pTcon->ses->server->ops->set_acl(pacl,
					size, inode, full_path, aclflags);
			} else {
				rc = -EOPNOTSUPP;
			}
			if (rc == 0) /* force revalidate of the inode */
				CIFS_I(inode)->time = 0;
			kfree(pacl);
		}
		break;
	}

	case XATTR_ACL_ACCESS:
#ifdef CONFIG_CIFS_POSIX
		if (!value)
			goto out;
		if (sb->s_flags & SB_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 & SB_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);
}


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) ||
		    (strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
			rc = cifs_attrib_get(dentry, inode, value, size);
			break;
		} else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) ||
		    (strcmp(name, SMB3_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);
		break;

	case XATTR_CIFS_ACL:
	case XATTR_CIFS_NTSD:
	case XATTR_CIFS_NTSD_FULL: {
		/*
		 * fetch owner, DACL, and SACL if asked for full descriptor,
		 * fetch owner and DACL otherwise
		 */
		u32 acllen, extra_info;
		struct cifs_ntsd *pacl;

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

		if (handler->flags == XATTR_CIFS_NTSD_FULL) {
			extra_info = SACL_SECINFO;
		} else {
			extra_info = 0;
		}
		pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
				inode, full_path, &acllen, extra_info);
		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);
		}
		break;
	}

	case XATTR_ACL_ACCESS:
#ifdef CONFIG_CIFS_POSIX
		if (sb->s_flags & SB_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 & SB_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);
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,
};

/*
 * Although this is just an alias for the above, need to move away from
 * confusing users and using the 20 year old term 'cifs' when it is no
 * longer secure and was replaced by SMB2/SMB3 a long time ago, and
 * SMB3 and later are highly secure.
 */
static const struct xattr_handler smb3_acl_xattr_handler = {
	.name = SMB3_XATTR_CIFS_ACL,
	.flags = XATTR_CIFS_ACL,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

static const struct xattr_handler cifs_cifs_ntsd_xattr_handler = {
	.name = CIFS_XATTR_CIFS_NTSD,
	.flags = XATTR_CIFS_NTSD,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

/*
 * Although this is just an alias for the above, need to move away from
 * confusing users and using the 20 year old term 'cifs' when it is no
 * longer secure and was replaced by SMB2/SMB3 a long time ago, and
 * SMB3 and later are highly secure.
 */
static const struct xattr_handler smb3_ntsd_xattr_handler = {
	.name = SMB3_XATTR_CIFS_NTSD,
	.flags = XATTR_CIFS_NTSD,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

static const struct xattr_handler cifs_cifs_ntsd_full_xattr_handler = {
	.name = CIFS_XATTR_CIFS_NTSD_FULL,
	.flags = XATTR_CIFS_NTSD_FULL,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
};

/*
 * Although this is just an alias for the above, need to move away from
 * confusing users and using the 20 year old term 'cifs' when it is no
 * longer secure and was replaced by SMB2/SMB3 a long time ago, and
 * SMB3 and later are highly secure.
 */
static const struct xattr_handler smb3_ntsd_full_xattr_handler = {
	.name = SMB3_XATTR_CIFS_NTSD_FULL,
	.flags = XATTR_CIFS_NTSD_FULL,
	.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,
	&smb3_acl_xattr_handler, /* alias for above since avoiding "cifs" */
	&cifs_cifs_ntsd_xattr_handler,
	&smb3_ntsd_xattr_handler, /* alias for above since avoiding "cifs" */
	&cifs_cifs_ntsd_full_xattr_handler,
	&smb3_ntsd_full_xattr_handler, /* alias for above since avoiding "cifs" */
	&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	33
63d37fb4	34	#define MAX_EA_VALUE_SIZE CIFSMaxBufSize
438471b6 BP	35	#define CIFS_XATTR_CIFS_ACL "system.cifs_acl" /* DACL only */
438471b6 BP	36	#define CIFS_XATTR_CIFS_NTSD "system.cifs_ntsd" /* owner plus DACL */
3970acf7	37	#define CIFS_XATTR_CIFS_NTSD_FULL "system.cifs_ntsd_full" /* owner/DACL/SACL */
a958fff2	38	#define CIFS_XATTR_ATTRIB "cifs.dosattrib" /* full name: user.cifs.dosattrib */
66098044	39	#define CIFS_XATTR_CREATETIME "cifs.creationtime" /* user.cifs.creationtime */
c4f7173a SF	40	/*
	41	* Although these three are just aliases for the above, need to move away from
	42	* confusing users and using the 20+ year old term 'cifs' when it is no longer
	43	* secure, replaced by SMB2 (then even more highly secure SMB3) many years ago
	44	*/
438471b6 BP	45	#define SMB3_XATTR_CIFS_ACL "system.smb3_acl" /* DACL only */
438471b6 BP	46	#define SMB3_XATTR_CIFS_NTSD "system.smb3_ntsd" /* owner plus DACL */
3970acf7	47	#define SMB3_XATTR_CIFS_NTSD_FULL "system.smb3_ntsd_full" /* owner/DACL/SACL */
c4f7173a SF	48	#define SMB3_XATTR_ATTRIB "smb3.dosattrib" /* full name: user.smb3.dosattrib */
c4f7173a SF	49	#define SMB3_XATTR_CREATETIME "smb3.creationtime" /* user.smb3.creationtime */
f995e740	50	/* BB need to add server (Samba e.g) support for security and trusted prefix */
1da177e4	51
438471b6	52	enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT,
3970acf7	53	XATTR_CIFS_NTSD, XATTR_CIFS_NTSD_FULL };
438471b6 BP	54
	55	static int cifs_attrib_set(unsigned int xid, struct cifs_tcon *pTcon,
	56	struct inode inode, char full_path,
	57	const void *value, size_t size)
	58	{
	59	ssize_t rc = -EOPNOTSUPP;
	60	__u32 pattrib = (__u32 )value;
	61	__u32 attrib;
	62	FILE_BASIC_INFO info_buf;
	63
	64	if ((value == NULL) \|\| (size != sizeof(__u32)))
	65	return -ERANGE;
	66
	67	memset(&info_buf, 0, sizeof(info_buf));
	68	attrib = *pattrib;
	69	info_buf.Attributes = cpu_to_le32(attrib);
	70	if (pTcon->ses->server->ops->set_file_info)
	71	rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
	72	&info_buf, xid);
	73	if (rc == 0)
	74	CIFS_I(inode)->cifsAttrs = attrib;
	75
	76	return rc;
	77	}
	78
	79	static int cifs_creation_time_set(unsigned int xid, struct cifs_tcon *pTcon,
	80	struct inode inode, char full_path,
	81	const void *value, size_t size)
	82	{
	83	ssize_t rc = -EOPNOTSUPP;
	84	__u64 pcreation_time = (__u64 )value;
	85	__u64 creation_time;
	86	FILE_BASIC_INFO info_buf;
	87
	88	if ((value == NULL) \|\| (size != sizeof(__u64)))
	89	return -ERANGE;
	90
	91	memset(&info_buf, 0, sizeof(info_buf));
	92	creation_time = *pcreation_time;
	93	info_buf.CreationTime = cpu_to_le64(creation_time);
	94	if (pTcon->ses->server->ops->set_file_info)
	95	rc = pTcon->ses->server->ops->set_file_info(inode, full_path,
	96	&info_buf, xid);
	97	if (rc == 0)
	98	CIFS_I(inode)->createtime = creation_time;
	99
	100	return rc;
	101	}
7ffec372	102
a9ae008f	103	static int cifs_xattr_set(const struct xattr_handler *handler,
59301226 AV	104	struct dentry dentry, struct inode inode,
	105	const char name, const void value,
	106	size_t size, int flags)
1da177e4 LT	107	{
1da177e4 LT	108	int rc = -EOPNOTSUPP;
6d5786a3	109	unsigned int xid;
a9ae008f	110	struct super_block *sb = dentry->d_sb;
5fdccfef	111	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
7ffec372	112	struct tcon_link *tlink;
96daf2b0	113	struct cifs_tcon *pTcon;
79a58d1f	114	char *full_path;
1da177e4	115
7ffec372 JL	116	tlink = cifs_sb_tlink(cifs_sb);
	117	if (IS_ERR(tlink))
	118	return PTR_ERR(tlink);
	119	pTcon = tlink_tcon(tlink);
	120
6d5786a3	121	xid = get_xid();
1da177e4	122
a9ae008f	123	full_path = build_path_from_dentry(dentry);
79a58d1f	124	if (full_path == NULL) {
0f3bc09e	125	rc = -ENOMEM;
a9ae008f	126	goto out;
1da177e4 LT	127	}
	128	/* return dos attributes as pseudo xattr */
	129	/* return alt name if available as pseudo attr */
	130
	131	/* if proc/fs/cifs/streamstoxattr is set then
79a58d1f	132	search server for EAs or streams to
1da177e4	133	returns as xattrs */
a9ae008f	134	if (size > MAX_EA_VALUE_SIZE) {
f96637be	135	cifs_dbg(FYI, "size of EA value too large\n");
7ffec372	136	rc = -EOPNOTSUPP;
a9ae008f	137	goto out;
1da177e4 LT	138	}
1da177e4 LT	139
a9ae008f AG	140	switch (handler->flags) {
a9ae008f AG	141	case XATTR_USER:
438471b6 BP	142	cifs_dbg(FYI, "%s:setting user xattr %s\n", __func__, name);
	143	if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) \|\|
	144	(strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
	145	rc = cifs_attrib_set(xid, pTcon, inode, full_path,
	146	value, size);
	147	if (rc == 0) /* force revalidate of the inode */
	148	CIFS_I(inode)->time = 0;
	149	break;
	150	} else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) \|\|
	151	(strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
	152	rc = cifs_creation_time_set(xid, pTcon, inode,
	153	full_path, value, size);
	154	if (rc == 0) /* force revalidate of the inode */
	155	CIFS_I(inode)->time = 0;
	156	break;
	157	}
	158
79a58d1f	159	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
a9ae008f	160	goto out;
ad7a2926	161
666753c3 SF	162	if (pTcon->ses->server->ops->set_EA)
666753c3 SF	163	rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
a9ae008f	164	full_path, name, value, (__u16)size,
5517554e	165	cifs_sb->local_nls, cifs_sb);
a9ae008f	166	break;
1da177e4	167
438471b6	168	case XATTR_CIFS_ACL:
3970acf7 BP	169	case XATTR_CIFS_NTSD:
3970acf7 BP	170	case XATTR_CIFS_NTSD_FULL: {
b0f8ef20	171	struct cifs_ntsd *pacl;
a9ae008f AG	172
	173	if (!value)
	174	goto out;
	175	pacl = kmalloc(size, GFP_KERNEL);
b73b9a4b	176	if (!pacl) {
b73b9a4b SF	177	rc = -ENOMEM;
b73b9a4b SF	178	} else {
a9ae008f	179	memcpy(pacl, value, size);
3970acf7 BP	180	if (pTcon->ses->server->ops->set_acl) {
3970acf7 BP	181	int aclflags = 0;
438471b6	182	rc = 0;
3970acf7 BP	183
	184	switch (handler->flags) {
	185	case XATTR_CIFS_NTSD_FULL:
	186	aclflags = (CIFS_ACL_OWNER \|
	187	CIFS_ACL_DACL \|
	188	CIFS_ACL_SACL);
	189	break;
	190	case XATTR_CIFS_NTSD:
	191	aclflags = (CIFS_ACL_OWNER \|
	192	CIFS_ACL_DACL);
	193	break;
	194	case XATTR_CIFS_ACL:
	195	default:
	196	aclflags = CIFS_ACL_DACL;
438471b6	197	}
3970acf7 BP	198
	199	rc = pTcon->ses->server->ops->set_acl(pacl,
	200	size, inode, full_path, aclflags);
438471b6	201	} else {
83e3bc23	202	rc = -EOPNOTSUPP;
438471b6	203	}
b73b9a4b	204	if (rc == 0) /* force revalidate of the inode */
59301226	205	CIFS_I(inode)->time = 0;
b73b9a4b	206	kfree(pacl);
b0f8ef20	207	}
a9ae008f AG	208	break;
	209	}
	210
	211	case XATTR_ACL_ACCESS:
1da177e4	212	#ifdef CONFIG_CIFS_POSIX
a9ae008f AG	213	if (!value)
a9ae008f AG	214	goto out;
1751e8a6	215	if (sb->s_flags & SB_POSIXACL)
a9ae008f AG	216	rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
	217	value, (const int)size,
	218	ACL_TYPE_ACCESS, cifs_sb->local_nls,
	219	cifs_remap(cifs_sb));
	220	#endif /* CONFIG_CIFS_POSIX */
	221	break;
	222
	223	case XATTR_ACL_DEFAULT:
1da177e4	224	#ifdef CONFIG_CIFS_POSIX
a9ae008f AG	225	if (!value)
a9ae008f AG	226	goto out;
1751e8a6	227	if (sb->s_flags & SB_POSIXACL)
a9ae008f AG	228	rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
	229	value, (const int)size,
	230	ACL_TYPE_DEFAULT, cifs_sb->local_nls,
	231	cifs_remap(cifs_sb));
	232	#endif /* CONFIG_CIFS_POSIX */
	233	break;
1da177e4 LT	234	}
1da177e4 LT	235
a9ae008f	236	out:
f99d49ad	237	kfree(full_path);
6d5786a3	238	free_xid(xid);
7ffec372	239	cifs_put_tlink(tlink);
1da177e4 LT	240	return rc;
	241	}
	242
a958fff2 SF	243	static int cifs_attrib_get(struct dentry *dentry,
	244	struct inode inode, void value,
	245	size_t size)
	246	{
	247	ssize_t rc;
	248	__u32 *pattribute;
	249
	250	rc = cifs_revalidate_dentry_attr(dentry);
	251
	252	if (rc)
	253	return rc;
	254
	255	if ((value == NULL) \|\| (size == 0))
	256	return sizeof(__u32);
	257	else if (size < sizeof(__u32))
	258	return -ERANGE;
	259
	260	/* return dos attributes as pseudo xattr */
	261	pattribute = (__u32 *)value;
	262	*pattribute = CIFS_I(inode)->cifsAttrs;
	263
	264	return sizeof(__u32);
	265	}
	266
66098044 SF	267	static int cifs_creation_time_get(struct dentry dentry, struct inode inode,
	268	void *value, size_t size)
	269	{
	270	ssize_t rc;
438471b6	271	__u64 *pcreatetime;
66098044 SF	272
	273	rc = cifs_revalidate_dentry_attr(dentry);
	274	if (rc)
	275	return rc;
	276
	277	if ((value == NULL) \|\| (size == 0))
	278	return sizeof(__u64);
	279	else if (size < sizeof(__u64))
	280	return -ERANGE;
	281
	282	/* return dos attributes as pseudo xattr */
	283	pcreatetime = (__u64 *)value;
	284	*pcreatetime = CIFS_I(inode)->createtime;
	285	return sizeof(__u64);
66098044 SF	286	}
66098044 SF	287
a958fff2	288
a9ae008f AG	289	static int cifs_xattr_get(const struct xattr_handler *handler,
	290	struct dentry dentry, struct inode inode,
	291	const char name, void value, size_t size)
1da177e4 LT	292	{
1da177e4 LT	293	ssize_t rc = -EOPNOTSUPP;
6d5786a3	294	unsigned int xid;
a9ae008f	295	struct super_block *sb = dentry->d_sb;
5fdccfef	296	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
7ffec372	297	struct tcon_link *tlink;
96daf2b0	298	struct cifs_tcon *pTcon;
79a58d1f	299	char *full_path;
1da177e4	300
7ffec372 JL	301	tlink = cifs_sb_tlink(cifs_sb);
	302	if (IS_ERR(tlink))
	303	return PTR_ERR(tlink);
	304	pTcon = tlink_tcon(tlink);
	305
6d5786a3	306	xid = get_xid();
1da177e4	307
a9ae008f	308	full_path = build_path_from_dentry(dentry);
79a58d1f	309	if (full_path == NULL) {
0f3bc09e	310	rc = -ENOMEM;
a9ae008f	311	goto out;
1da177e4	312	}
a958fff2	313
1da177e4	314	/* return alt name if available as pseudo attr */
a9ae008f AG	315	switch (handler->flags) {
a9ae008f AG	316	case XATTR_USER:
a958fff2	317	cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name);
c4f7173a SF	318	if ((strcmp(name, CIFS_XATTR_ATTRIB) == 0) \|\|
c4f7173a SF	319	(strcmp(name, SMB3_XATTR_ATTRIB) == 0)) {
a958fff2 SF	320	rc = cifs_attrib_get(dentry, inode, value, size);
a958fff2 SF	321	break;
c4f7173a SF	322	} else if ((strcmp(name, CIFS_XATTR_CREATETIME) == 0) \|\|
c4f7173a SF	323	(strcmp(name, SMB3_XATTR_CREATETIME) == 0)) {
66098044 SF	324	rc = cifs_creation_time_get(dentry, inode, value, size);
66098044 SF	325	break;
a958fff2 SF	326	}
a958fff2 SF	327
79a58d1f	328	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
a9ae008f	329	goto out;
1da177e4	330
666753c3 SF	331	if (pTcon->ses->server->ops->query_all_EAs)
666753c3 SF	332	rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
67b4c889	333	full_path, name, value, size, cifs_sb);
a9ae008f	334	break;
1da177e4	335
438471b6	336	case XATTR_CIFS_ACL:
3970acf7 BP	337	case XATTR_CIFS_NTSD:
	338	case XATTR_CIFS_NTSD_FULL: {
	339	/*
	340	* fetch owner, DACL, and SACL if asked for full descriptor,
	341	* fetch owner and DACL otherwise
	342	*/
9541b813	343	u32 acllen, extra_info;
a9ae008f AG	344	struct cifs_ntsd *pacl;
	345
	346	if (pTcon->ses->server->ops->get_acl == NULL)
	347	goto out; /* rc already EOPNOTSUPP */
	348
3970acf7	349	if (handler->flags == XATTR_CIFS_NTSD_FULL) {
9541b813	350	extra_info = SACL_SECINFO;
3970acf7	351	} else {
9541b813	352	extra_info = 0;
3970acf7	353	}
a9ae008f	354	pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
9541b813	355	inode, full_path, &acllen, extra_info);
a9ae008f AG	356	if (IS_ERR(pacl)) {
	357	rc = PTR_ERR(pacl);
	358	cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
	359	__func__, rc);
	360	} else {
	361	if (value) {
	362	if (acllen > size)
	363	acllen = -ERANGE;
	364	else
	365	memcpy(value, pacl, acllen);
	366	}
	367	rc = acllen;
	368	kfree(pacl);
	369	}
a9ae008f AG	370	break;
	371	}
	372
	373	case XATTR_ACL_ACCESS:
1da177e4	374	#ifdef CONFIG_CIFS_POSIX
1751e8a6	375	if (sb->s_flags & SB_POSIXACL)
1da0c78b	376	rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
a9ae008f	377	value, size, ACL_TYPE_ACCESS,
737b758c	378	cifs_sb->local_nls,
2baa2682	379	cifs_remap(cifs_sb));
a9ae008f AG	380	#endif /* CONFIG_CIFS_POSIX */
	381	break;
	382
	383	case XATTR_ACL_DEFAULT:
1da177e4	384	#ifdef CONFIG_CIFS_POSIX
1751e8a6	385	if (sb->s_flags & SB_POSIXACL)
1da0c78b	386	rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
a9ae008f	387	value, size, ACL_TYPE_DEFAULT,
737b758c	388	cifs_sb->local_nls,
2baa2682	389	cifs_remap(cifs_sb));
a9ae008f AG	390	#endif /* CONFIG_CIFS_POSIX */
	391	break;
	392	}
1da177e4	393
79a58d1f	394	/* We could add an additional check for streams ie
1da177e4	395	if proc/fs/cifs/streamstoxattr is set then
79a58d1f	396	search server for EAs or streams to
1da177e4 LT	397	returns as xattrs */
1da177e4 LT	398
79a58d1f SF	399	if (rc == -EINVAL)
79a58d1f SF	400	rc = -EOPNOTSUPP;
1da177e4	401
a9ae008f	402	out:
f99d49ad	403	kfree(full_path);
6d5786a3	404	free_xid(xid);
7ffec372	405	cifs_put_tlink(tlink);
1da177e4 LT	406	return rc;
	407	}
	408
79a58d1f	409	ssize_t cifs_listxattr(struct dentry direntry, char data, size_t buf_size)
1da177e4 LT	410	{
1da177e4 LT	411	ssize_t rc = -EOPNOTSUPP;
6d5786a3	412	unsigned int xid;
5fdccfef	413	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
7ffec372	414	struct tcon_link *tlink;
96daf2b0	415	struct cifs_tcon *pTcon;
79a58d1f	416	char *full_path;
1da177e4	417
79a58d1f	418	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
ea4c07d7 SF	419	return -EOPNOTSUPP;
ea4c07d7 SF	420
7ffec372 JL	421	tlink = cifs_sb_tlink(cifs_sb);
	422	if (IS_ERR(tlink))
	423	return PTR_ERR(tlink);
	424	pTcon = tlink_tcon(tlink);
	425
6d5786a3	426	xid = get_xid();
ea4c07d7	427
1da177e4	428	full_path = build_path_from_dentry(direntry);
79a58d1f	429	if (full_path == NULL) {
0f3bc09e	430	rc = -ENOMEM;
7ffec372	431	goto list_ea_exit;
1da177e4 LT	432	}
	433	/* return dos attributes as pseudo xattr */
	434	/* return alt name if available as pseudo attr */
	435
	436	/* if proc/fs/cifs/streamstoxattr is set then
79a58d1f	437	search server for EAs or streams to
1da177e4	438	returns as xattrs */
1da177e4	439
666753c3 SF	440	if (pTcon->ses->server->ops->query_all_EAs)
666753c3 SF	441	rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
67b4c889	442	full_path, NULL, data, buf_size, cifs_sb);
7ffec372	443	list_ea_exit:
f99d49ad	444	kfree(full_path);
6d5786a3	445	free_xid(xid);
7ffec372	446	cifs_put_tlink(tlink);
1da177e4 LT	447	return rc;
1da177e4 LT	448	}
a9ae008f AG	449
	450	static const struct xattr_handler cifs_user_xattr_handler = {
	451	.prefix = XATTR_USER_PREFIX,
	452	.flags = XATTR_USER,
	453	.get = cifs_xattr_get,
	454	.set = cifs_xattr_set,
	455	};
	456
	457	/* os2.* attributes are treated like user.* attributes */
	458	static const struct xattr_handler cifs_os2_xattr_handler = {
	459	.prefix = XATTR_OS2_PREFIX,
	460	.flags = XATTR_USER,
	461	.get = cifs_xattr_get,
	462	.set = cifs_xattr_set,
	463	};
	464
	465	static const struct xattr_handler cifs_cifs_acl_xattr_handler = {
	466	.name = CIFS_XATTR_CIFS_ACL,
	467	.flags = XATTR_CIFS_ACL,
	468	.get = cifs_xattr_get,
	469	.set = cifs_xattr_set,
	470	};
	471
c4f7173a SF	472	/*
	473	* Although this is just an alias for the above, need to move away from
	474	* confusing users and using the 20 year old term 'cifs' when it is no
	475	* longer secure and was replaced by SMB2/SMB3 a long time ago, and
	476	* SMB3 and later are highly secure.
	477	*/
	478	static const struct xattr_handler smb3_acl_xattr_handler = {
	479	.name = SMB3_XATTR_CIFS_ACL,
	480	.flags = XATTR_CIFS_ACL,
	481	.get = cifs_xattr_get,
	482	.set = cifs_xattr_set,
	483	};
	484
438471b6 BP	485	static const struct xattr_handler cifs_cifs_ntsd_xattr_handler = {
	486	.name = CIFS_XATTR_CIFS_NTSD,
	487	.flags = XATTR_CIFS_NTSD,
	488	.get = cifs_xattr_get,
	489	.set = cifs_xattr_set,
	490	};
	491
	492	/*
	493	* Although this is just an alias for the above, need to move away from
	494	* confusing users and using the 20 year old term 'cifs' when it is no
	495	* longer secure and was replaced by SMB2/SMB3 a long time ago, and
	496	* SMB3 and later are highly secure.
	497	*/
	498	static const struct xattr_handler smb3_ntsd_xattr_handler = {
	499	.name = SMB3_XATTR_CIFS_NTSD,
	500	.flags = XATTR_CIFS_NTSD,
	501	.get = cifs_xattr_get,
	502	.set = cifs_xattr_set,
	503	};
	504
3970acf7 BP	505	static const struct xattr_handler cifs_cifs_ntsd_full_xattr_handler = {
	506	.name = CIFS_XATTR_CIFS_NTSD_FULL,
	507	.flags = XATTR_CIFS_NTSD_FULL,
	508	.get = cifs_xattr_get,
	509	.set = cifs_xattr_set,
	510	};
	511
	512	/*
	513	* Although this is just an alias for the above, need to move away from
	514	* confusing users and using the 20 year old term 'cifs' when it is no
	515	* longer secure and was replaced by SMB2/SMB3 a long time ago, and
	516	* SMB3 and later are highly secure.
	517	*/
	518	static const struct xattr_handler smb3_ntsd_full_xattr_handler = {
	519	.name = SMB3_XATTR_CIFS_NTSD_FULL,
	520	.flags = XATTR_CIFS_NTSD_FULL,
	521	.get = cifs_xattr_get,
	522	.set = cifs_xattr_set,
	523	};
	524
	525
a9ae008f AG	526	static const struct xattr_handler cifs_posix_acl_access_xattr_handler = {
	527	.name = XATTR_NAME_POSIX_ACL_ACCESS,
	528	.flags = XATTR_ACL_ACCESS,
	529	.get = cifs_xattr_get,
	530	.set = cifs_xattr_set,
	531	};
	532
	533	static const struct xattr_handler cifs_posix_acl_default_xattr_handler = {
	534	.name = XATTR_NAME_POSIX_ACL_DEFAULT,
	535	.flags = XATTR_ACL_DEFAULT,
	536	.get = cifs_xattr_get,
	537	.set = cifs_xattr_set,
	538	};
	539
	540	const struct xattr_handler *cifs_xattr_handlers[] = {
	541	&cifs_user_xattr_handler,
	542	&cifs_os2_xattr_handler,
	543	&cifs_cifs_acl_xattr_handler,
c4f7173a	544	&smb3_acl_xattr_handler, /* alias for above since avoiding "cifs" */
438471b6 BP	545	&cifs_cifs_ntsd_xattr_handler,
438471b6 BP	546	&smb3_ntsd_xattr_handler, /* alias for above since avoiding "cifs" */
3970acf7 BP	547	&cifs_cifs_ntsd_full_xattr_handler,
3970acf7 BP	548	&smb3_ntsd_full_xattr_handler, /* alias for above since avoiding "cifs" */
a9ae008f AG	549	&cifs_posix_acl_access_xattr_handler,
	550	&cifs_posix_acl_default_xattr_handler,
	551	NULL
	552	};