[linux-2.6-block.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"

#define MAX_EA_VALUE_SIZE 65535
#define CIFS_XATTR_DOS_ATTRIB "user.DosAttrib"
#define CIFS_XATTR_CIFS_ACL "system.cifs_acl"

/* BB need to add server (Samba e.g) support for security and trusted prefix */

int cifs_removexattr(struct dentry *direntry, const char *ea_name)
{
	int rc = -EOPNOTSUPP;
#ifdef CONFIG_CIFS_XATTR
	unsigned int xid;
	struct cifs_sb_info *cifs_sb;
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	struct super_block *sb;
	char *full_path = NULL;

	if (direntry == NULL)
		return -EIO;
	if (direntry->d_inode == NULL)
		return -EIO;
	sb = direntry->d_inode->i_sb;
	if (sb == NULL)
		return -EIO;

	cifs_sb = CIFS_SB(sb);
	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 remove_ea_exit;
	}
	if (ea_name == NULL) {
		cifs_dbg(FYI, "Null xattr names not supported\n");
	} else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
		&& (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN))) {
		cifs_dbg(FYI,
			 "illegal xattr request %s (only user namespace supported)\n",
			 ea_name);
		/* BB what if no namespace prefix? */
		/* Should we just pass them to server, except for
		system and perhaps security prefixes? */
	} else {
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto remove_ea_exit;

		ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
		rc = CIFSSMBSetEA(xid, pTcon, full_path, ea_name, NULL,
			(__u16)0, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	}
remove_ea_exit:
	kfree(full_path);
	free_xid(xid);
	cifs_put_tlink(tlink);
#endif
	return rc;
}

int cifs_setxattr(struct dentry *direntry, const char *ea_name,
		  const void *ea_value, size_t value_size, int flags)
{
	int rc = -EOPNOTSUPP;
#ifdef CONFIG_CIFS_XATTR
	unsigned int xid;
	struct cifs_sb_info *cifs_sb;
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	struct super_block *sb;
	char *full_path;

	if (direntry == NULL)
		return -EIO;
	if (direntry->d_inode == NULL)
		return -EIO;
	sb = direntry->d_inode->i_sb;
	if (sb == NULL)
		return -EIO;

	cifs_sb = CIFS_SB(sb);
	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 set_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 (value_size > MAX_EA_VALUE_SIZE) {
		cifs_dbg(FYI, "size of EA value too large\n");
		rc = -EOPNOTSUPP;
		goto set_ea_exit;
	}

	if (ea_name == NULL) {
		cifs_dbg(FYI, "Null xattr names not supported\n");
	} else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
		   == 0) {
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto set_ea_exit;
		if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0)
			cifs_dbg(FYI, "attempt to set cifs inode metadata\n");

		ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
		rc = CIFSSMBSetEA(xid, pTcon, full_path, ea_name, ea_value,
			(__u16)value_size, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	} else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN)
		   == 0) {
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto set_ea_exit;

		ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
		rc = CIFSSMBSetEA(xid, pTcon, full_path, ea_name, ea_value,
			(__u16)value_size, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	} else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
			strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
#ifdef CONFIG_CIFS_ACL
		struct cifs_ntsd *pacl;
		pacl = kmalloc(value_size, GFP_KERNEL);
		if (!pacl) {
			rc = -ENOMEM;
		} else {
			memcpy(pacl, ea_value, value_size);
			rc = set_cifs_acl(pacl, value_size,
				direntry->d_inode, full_path, CIFS_ACL_DACL);
			if (rc == 0) /* force revalidate of the inode */
				CIFS_I(direntry->d_inode)->time = 0;
			kfree(pacl);
		}
#else
		cifs_dbg(FYI, "Set CIFS ACL not supported yet\n");
#endif /* CONFIG_CIFS_ACL */
	} else {
		int temp;
		temp = strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
			strlen(POSIX_ACL_XATTR_ACCESS));
		if (temp == 0) {
#ifdef CONFIG_CIFS_POSIX
			if (sb->s_flags & MS_POSIXACL)
				rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
					ea_value, (const int)value_size,
					ACL_TYPE_ACCESS, cifs_sb->local_nls,
					cifs_sb->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
			cifs_dbg(FYI, "set POSIX ACL rc %d\n", rc);
#else
			cifs_dbg(FYI, "set POSIX ACL not supported\n");
#endif
		} else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
				   strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
#ifdef CONFIG_CIFS_POSIX
			if (sb->s_flags & MS_POSIXACL)
				rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
					ea_value, (const int)value_size,
					ACL_TYPE_DEFAULT, cifs_sb->local_nls,
					cifs_sb->mnt_cifs_flags &
						CIFS_MOUNT_MAP_SPECIAL_CHR);
			cifs_dbg(FYI, "set POSIX default ACL rc %d\n", rc);
#else
			cifs_dbg(FYI, "set default POSIX ACL not supported\n");
#endif
		} else {
			cifs_dbg(FYI, "illegal xattr request %s (only user namespace supported)\n",
				 ea_name);
		  /* BB what if no namespace prefix? */
		  /* Should we just pass them to server, except for
		  system and perhaps security prefixes? */
		}
	}

set_ea_exit:
	kfree(full_path);
	free_xid(xid);
	cifs_put_tlink(tlink);
#endif
	return rc;
}

ssize_t cifs_getxattr(struct dentry *direntry, const char *ea_name,
	void *ea_value, size_t buf_size)
{
	ssize_t rc = -EOPNOTSUPP;
#ifdef CONFIG_CIFS_XATTR
	unsigned int xid;
	struct cifs_sb_info *cifs_sb;
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	struct super_block *sb;
	char *full_path;

	if (direntry == NULL)
		return -EIO;
	if (direntry->d_inode == NULL)
		return -EIO;
	sb = direntry->d_inode->i_sb;
	if (sb == NULL)
		return -EIO;

	cifs_sb = CIFS_SB(sb);
	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 get_ea_exit;
	}
	/* return dos attributes as pseudo xattr */
	/* return alt name if available as pseudo attr */
	if (ea_name == NULL) {
		cifs_dbg(FYI, "Null xattr names not supported\n");
	} else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
		   == 0) {
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto get_ea_exit;

		if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0) {
			cifs_dbg(FYI, "attempt to query cifs inode metadata\n");
			/* revalidate/getattr then populate from inode */
		} /* BB add else when above is implemented */
		ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
		rc = CIFSSMBQAllEAs(xid, pTcon, full_path, ea_name, ea_value,
			buf_size, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	} else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) {
		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto get_ea_exit;

		ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
		rc = CIFSSMBQAllEAs(xid, pTcon, full_path, ea_name, ea_value,
			buf_size, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	} else if (strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
			  strlen(POSIX_ACL_XATTR_ACCESS)) == 0) {
#ifdef CONFIG_CIFS_POSIX
		if (sb->s_flags & MS_POSIXACL)
			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
				ea_value, buf_size, ACL_TYPE_ACCESS,
				cifs_sb->local_nls,
				cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
#else
		cifs_dbg(FYI, "Query POSIX ACL not supported yet\n");
#endif /* CONFIG_CIFS_POSIX */
	} else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
			  strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
#ifdef CONFIG_CIFS_POSIX
		if (sb->s_flags & MS_POSIXACL)
			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
				ea_value, buf_size, ACL_TYPE_DEFAULT,
				cifs_sb->local_nls,
				cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);
#else
		cifs_dbg(FYI, "Query POSIX default ACL not supported yet\n");
#endif /* CONFIG_CIFS_POSIX */
	} else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
				strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
#ifdef CONFIG_CIFS_ACL
			u32 acllen;
			struct cifs_ntsd *pacl;

			pacl = get_cifs_acl(cifs_sb, direntry->d_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 (ea_value) {
					if (acllen > buf_size)
						acllen = -ERANGE;
					else
						memcpy(ea_value, pacl, acllen);
				}
				rc = acllen;
				kfree(pacl);
			}
#else
			cifs_dbg(FYI, "Query CIFS ACL not supported yet\n");
#endif /* CONFIG_CIFS_ACL */
	} else if (strncmp(ea_name,
		  XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) == 0) {
		cifs_dbg(FYI, "Trusted xattr namespace not supported yet\n");
	} else if (strncmp(ea_name,
		  XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) == 0) {
		cifs_dbg(FYI, "Security xattr namespace not supported yet\n");
	} else
		cifs_dbg(FYI,
			 "illegal xattr request %s (only user namespace supported)\n",
			 ea_name);

	/* 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;

get_ea_exit:
	kfree(full_path);
	free_xid(xid);
	cifs_put_tlink(tlink);
#endif
	return rc;
}

ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
{
	ssize_t rc = -EOPNOTSUPP;
#ifdef CONFIG_CIFS_XATTR
	unsigned int xid;
	struct cifs_sb_info *cifs_sb;
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	struct super_block *sb;
	char *full_path;

	if (direntry == NULL)
		return -EIO;
	if (direntry->d_inode == NULL)
		return -EIO;
	sb = direntry->d_inode->i_sb;
	if (sb == NULL)
		return -EIO;

	cifs_sb = CIFS_SB(sb);
	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 */
	rc = CIFSSMBQAllEAs(xid, pTcon, full_path, NULL, data,
				buf_size, cifs_sb->local_nls,
				cifs_sb->mnt_cifs_flags &
					CIFS_MOUNT_MAP_SPECIAL_CHR);

list_ea_exit:
	kfree(full_path);
	free_xid(xid);
	cifs_put_tlink(tlink);
#endif
	return rc;
}
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"
	31
	32	#define MAX_EA_VALUE_SIZE 65535
	33	#define CIFS_XATTR_DOS_ATTRIB "user.DosAttrib"
fbeba8bb	34	#define CIFS_XATTR_CIFS_ACL "system.cifs_acl"
1da177e4	35
f995e740	36	/* BB need to add server (Samba e.g) support for security and trusted prefix */
1da177e4	37
79a58d1f	38	int cifs_removexattr(struct dentry direntry, const char ea_name)
1da177e4 LT	39	{
	40	int rc = -EOPNOTSUPP;
	41	#ifdef CONFIG_CIFS_XATTR
6d5786a3	42	unsigned int xid;
1da177e4	43	struct cifs_sb_info *cifs_sb;
7ffec372	44	struct tcon_link *tlink;
96daf2b0	45	struct cifs_tcon *pTcon;
79a58d1f	46	struct super_block *sb;
7ffec372	47	char *full_path = NULL;
79a58d1f SF	48
79a58d1f SF	49	if (direntry == NULL)
1da177e4	50	return -EIO;
79a58d1f	51	if (direntry->d_inode == NULL)
1da177e4 LT	52	return -EIO;
1da177e4 LT	53	sb = direntry->d_inode->i_sb;
79a58d1f	54	if (sb == NULL)
1da177e4	55	return -EIO;
79a58d1f	56
1da177e4	57	cifs_sb = CIFS_SB(sb);
7ffec372 JL	58	tlink = cifs_sb_tlink(cifs_sb);
	59	if (IS_ERR(tlink))
	60	return PTR_ERR(tlink);
	61	pTcon = tlink_tcon(tlink);
	62
6d5786a3	63	xid = get_xid();
79a58d1f	64
1da177e4	65	full_path = build_path_from_dentry(direntry);
79a58d1f	66	if (full_path == NULL) {
0f3bc09e	67	rc = -ENOMEM;
7ffec372	68	goto remove_ea_exit;
1da177e4	69	}
79a58d1f	70	if (ea_name == NULL) {
f96637be	71	cifs_dbg(FYI, "Null xattr names not supported\n");
f995e740 MZ	72	} else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
f995e740 MZ	73	&& (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN))) {
f96637be JP	74	cifs_dbg(FYI,
	75	"illegal xattr request %s (only user namespace supported)\n",
	76	ea_name);
1da177e4 LT	77	/* BB what if no namespace prefix? */
	78	/* Should we just pass them to server, except for
	79	system and perhaps security prefixes? */
	80	} else {
79a58d1f	81	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
1da177e4 LT	82	goto remove_ea_exit;
1da177e4 LT	83
f995e740	84	ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
79a58d1f	85	rc = CIFSSMBSetEA(xid, pTcon, full_path, ea_name, NULL,
737b758c SF	86	(__u16)0, cifs_sb->local_nls,
737b758c SF	87	cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 LT	88	}
1da177e4 LT	89	remove_ea_exit:
f99d49ad	90	kfree(full_path);
6d5786a3	91	free_xid(xid);
7ffec372	92	cifs_put_tlink(tlink);
1da177e4 LT	93	#endif
	94	return rc;
	95	}
	96
79a58d1f SF	97	int cifs_setxattr(struct dentry direntry, const char ea_name,
79a58d1f SF	98	const void *ea_value, size_t value_size, int flags)
1da177e4 LT	99	{
	100	int rc = -EOPNOTSUPP;
	101	#ifdef CONFIG_CIFS_XATTR
6d5786a3	102	unsigned int xid;
1da177e4	103	struct cifs_sb_info *cifs_sb;
7ffec372	104	struct tcon_link *tlink;
96daf2b0	105	struct cifs_tcon *pTcon;
79a58d1f SF	106	struct super_block *sb;
79a58d1f SF	107	char *full_path;
1da177e4	108
79a58d1f	109	if (direntry == NULL)
1da177e4	110	return -EIO;
79a58d1f	111	if (direntry->d_inode == NULL)
1da177e4 LT	112	return -EIO;
1da177e4 LT	113	sb = direntry->d_inode->i_sb;
79a58d1f	114	if (sb == NULL)
1da177e4	115	return -EIO;
1da177e4 LT	116
1da177e4 LT	117	cifs_sb = CIFS_SB(sb);
7ffec372 JL	118	tlink = cifs_sb_tlink(cifs_sb);
	119	if (IS_ERR(tlink))
	120	return PTR_ERR(tlink);
	121	pTcon = tlink_tcon(tlink);
	122
6d5786a3	123	xid = get_xid();
1da177e4	124
1da177e4	125	full_path = build_path_from_dentry(direntry);
79a58d1f	126	if (full_path == NULL) {
0f3bc09e	127	rc = -ENOMEM;
7ffec372	128	goto set_ea_exit;
1da177e4 LT	129	}
	130	/* return dos attributes as pseudo xattr */
	131	/* return alt name if available as pseudo attr */
	132
	133	/* if proc/fs/cifs/streamstoxattr is set then
79a58d1f	134	search server for EAs or streams to
1da177e4	135	returns as xattrs */
79a58d1f	136	if (value_size > MAX_EA_VALUE_SIZE) {
f96637be	137	cifs_dbg(FYI, "size of EA value too large\n");
7ffec372 JL	138	rc = -EOPNOTSUPP;
7ffec372 JL	139	goto set_ea_exit;
1da177e4 LT	140	}
1da177e4 LT	141
79a58d1f	142	if (ea_name == NULL) {
f96637be	143	cifs_dbg(FYI, "Null xattr names not supported\n");
f995e740 MZ	144	} else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
f995e740 MZ	145	== 0) {
79a58d1f	146	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
1da177e4	147	goto set_ea_exit;
ad7a2926	148	if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0)
f96637be	149	cifs_dbg(FYI, "attempt to set cifs inode metadata\n");
ad7a2926	150
f995e740	151	ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
79a58d1f	152	rc = CIFSSMBSetEA(xid, pTcon, full_path, ea_name, ea_value,
737b758c SF	153	(__u16)value_size, cifs_sb->local_nls,
737b758c SF	154	cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
f995e740 MZ	155	} else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN)
f995e740 MZ	156	== 0) {
79a58d1f	157	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
1da177e4 LT	158	goto set_ea_exit;
1da177e4 LT	159
f995e740	160	ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
79a58d1f	161	rc = CIFSSMBSetEA(xid, pTcon, full_path, ea_name, ea_value,
737b758c SF	162	(__u16)value_size, cifs_sb->local_nls,
737b758c SF	163	cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
b73b9a4b SF	164	} else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
b73b9a4b SF	165	strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
b0f8ef20 SN	166	#ifdef CONFIG_CIFS_ACL
b0f8ef20 SN	167	struct cifs_ntsd *pacl;
b73b9a4b SF	168	pacl = kmalloc(value_size, GFP_KERNEL);
b73b9a4b SF	169	if (!pacl) {
b73b9a4b SF	170	rc = -ENOMEM;
b73b9a4b SF	171	} else {
b73b9a4b SF	172	memcpy(pacl, ea_value, value_size);
b73b9a4b SF	173	rc = set_cifs_acl(pacl, value_size,
a5ff3769	174	direntry->d_inode, full_path, CIFS_ACL_DACL);
b73b9a4b SF	175	if (rc == 0) /* force revalidate of the inode */
	176	CIFS_I(direntry->d_inode)->time = 0;
	177	kfree(pacl);
b0f8ef20	178	}
b73b9a4b	179	#else
f96637be	180	cifs_dbg(FYI, "Set CIFS ACL not supported yet\n");
b73b9a4b	181	#endif /* CONFIG_CIFS_ACL */
1da177e4	182	} else {
79a58d1f SF	183	int temp;
79a58d1f SF	184	temp = strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
1da177e4 LT	185	strlen(POSIX_ACL_XATTR_ACCESS));
	186	if (temp == 0) {
	187	#ifdef CONFIG_CIFS_POSIX
79a58d1f SF	188	if (sb->s_flags & MS_POSIXACL)
	189	rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
	190	ea_value, (const int)value_size,
	191	ACL_TYPE_ACCESS, cifs_sb->local_nls,
	192	cifs_sb->mnt_cifs_flags &
737b758c	193	CIFS_MOUNT_MAP_SPECIAL_CHR);
f96637be	194	cifs_dbg(FYI, "set POSIX ACL rc %d\n", rc);
1da177e4	195	#else
f96637be	196	cifs_dbg(FYI, "set POSIX ACL not supported\n");
1da177e4	197	#endif
79a58d1f SF	198	} else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
79a58d1f SF	199	strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
1da177e4	200	#ifdef CONFIG_CIFS_POSIX
79a58d1f SF	201	if (sb->s_flags & MS_POSIXACL)
	202	rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
	203	ea_value, (const int)value_size,
737b758c	204	ACL_TYPE_DEFAULT, cifs_sb->local_nls,
79a58d1f	205	cifs_sb->mnt_cifs_flags &
737b758c	206	CIFS_MOUNT_MAP_SPECIAL_CHR);
f96637be	207	cifs_dbg(FYI, "set POSIX default ACL rc %d\n", rc);
1da177e4	208	#else
f96637be	209	cifs_dbg(FYI, "set default POSIX ACL not supported\n");
1da177e4 LT	210	#endif
1da177e4 LT	211	} else {
f96637be JP	212	cifs_dbg(FYI, "illegal xattr request %s (only user namespace supported)\n",
f96637be JP	213	ea_name);
1da177e4	214	/* BB what if no namespace prefix? */
79a58d1f	215	/* Should we just pass them to server, except for
1da177e4 LT	216	system and perhaps security prefixes? */
	217	}
	218	}
	219
	220	set_ea_exit:
f99d49ad	221	kfree(full_path);
6d5786a3	222	free_xid(xid);
7ffec372	223	cifs_put_tlink(tlink);
1da177e4 LT	224	#endif
	225	return rc;
	226	}
	227
79a58d1f SF	228	ssize_t cifs_getxattr(struct dentry direntry, const char ea_name,
79a58d1f SF	229	void *ea_value, size_t buf_size)
1da177e4 LT	230	{
	231	ssize_t rc = -EOPNOTSUPP;
	232	#ifdef CONFIG_CIFS_XATTR
6d5786a3	233	unsigned int xid;
1da177e4	234	struct cifs_sb_info *cifs_sb;
7ffec372	235	struct tcon_link *tlink;
96daf2b0	236	struct cifs_tcon *pTcon;
79a58d1f SF	237	struct super_block *sb;
79a58d1f SF	238	char *full_path;
1da177e4	239
79a58d1f	240	if (direntry == NULL)
1da177e4	241	return -EIO;
79a58d1f	242	if (direntry->d_inode == NULL)
1da177e4 LT	243	return -EIO;
1da177e4 LT	244	sb = direntry->d_inode->i_sb;
79a58d1f	245	if (sb == NULL)
1da177e4 LT	246	return -EIO;
1da177e4 LT	247
1da177e4	248	cifs_sb = CIFS_SB(sb);
7ffec372 JL	249	tlink = cifs_sb_tlink(cifs_sb);
	250	if (IS_ERR(tlink))
	251	return PTR_ERR(tlink);
	252	pTcon = tlink_tcon(tlink);
	253
6d5786a3	254	xid = get_xid();
1da177e4	255
1da177e4	256	full_path = build_path_from_dentry(direntry);
79a58d1f	257	if (full_path == NULL) {
0f3bc09e	258	rc = -ENOMEM;
7ffec372	259	goto get_ea_exit;
1da177e4 LT	260	}
	261	/* return dos attributes as pseudo xattr */
	262	/* return alt name if available as pseudo attr */
79a58d1f	263	if (ea_name == NULL) {
f96637be	264	cifs_dbg(FYI, "Null xattr names not supported\n");
f995e740 MZ	265	} else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
f995e740 MZ	266	== 0) {
79a58d1f	267	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
1da177e4 LT	268	goto get_ea_exit;
1da177e4 LT	269
79a58d1f	270	if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0) {
f96637be	271	cifs_dbg(FYI, "attempt to query cifs inode metadata\n");
1da177e4 LT	272	/* revalidate/getattr then populate from inode */
1da177e4 LT	273	} /* BB add else when above is implemented */
f995e740	274	ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
31c0519f	275	rc = CIFSSMBQAllEAs(xid, pTcon, full_path, ea_name, ea_value,
737b758c SF	276	buf_size, cifs_sb->local_nls,
737b758c SF	277	cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
f995e740	278	} else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) {
79a58d1f	279	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
1da177e4 LT	280	goto get_ea_exit;
1da177e4 LT	281
f995e740	282	ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
31c0519f	283	rc = CIFSSMBQAllEAs(xid, pTcon, full_path, ea_name, ea_value,
737b758c SF	284	buf_size, cifs_sb->local_nls,
737b758c SF	285	cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
79a58d1f	286	} else if (strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
0a4b92c0	287	strlen(POSIX_ACL_XATTR_ACCESS)) == 0) {
1da177e4	288	#ifdef CONFIG_CIFS_POSIX
79a58d1f	289	if (sb->s_flags & MS_POSIXACL)
1da0c78b	290	rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
79a58d1f	291	ea_value, buf_size, ACL_TYPE_ACCESS,
737b758c	292	cifs_sb->local_nls,
79a58d1f	293	cifs_sb->mnt_cifs_flags &
737b758c	294	CIFS_MOUNT_MAP_SPECIAL_CHR);
79a58d1f	295	#else
f96637be	296	cifs_dbg(FYI, "Query POSIX ACL not supported yet\n");
1da177e4	297	#endif /* CONFIG_CIFS_POSIX */
79a58d1f	298	} else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
0a4b92c0	299	strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
1da177e4	300	#ifdef CONFIG_CIFS_POSIX
79a58d1f	301	if (sb->s_flags & MS_POSIXACL)
1da0c78b	302	rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
79a58d1f	303	ea_value, buf_size, ACL_TYPE_DEFAULT,
737b758c	304	cifs_sb->local_nls,
79a58d1f	305	cifs_sb->mnt_cifs_flags &
737b758c	306	CIFS_MOUNT_MAP_SPECIAL_CHR);
79a58d1f	307	#else
f96637be	308	cifs_dbg(FYI, "Query POSIX default ACL not supported yet\n");
fbeba8bb SP	309	#endif /* CONFIG_CIFS_POSIX */
	310	} else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
	311	strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
	312	#ifdef CONFIG_CIFS_ACL
	313	u32 acllen;
	314	struct cifs_ntsd *pacl;
	315
	316	pacl = get_cifs_acl(cifs_sb, direntry->d_inode,
	317	full_path, &acllen);
	318	if (IS_ERR(pacl)) {
	319	rc = PTR_ERR(pacl);
f96637be JP	320	cifs_dbg(VFS, "%s: error %zd getting sec desc\n",
f96637be JP	321	__func__, rc);
fbeba8bb SP	322	} else {
	323	if (ea_value) {
	324	if (acllen > buf_size)
	325	acllen = -ERANGE;
	326	else
	327	memcpy(ea_value, pacl, acllen);
	328	}
	329	rc = acllen;
	330	kfree(pacl);
	331	}
	332	#else
f96637be	333	cifs_dbg(FYI, "Query CIFS ACL not supported yet\n");
fbeba8bb	334	#endif /* CONFIG_CIFS_ACL */
79a58d1f	335	} else if (strncmp(ea_name,
f995e740	336	XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) == 0) {
f96637be	337	cifs_dbg(FYI, "Trusted xattr namespace not supported yet\n");
79a58d1f	338	} else if (strncmp(ea_name,
f995e740	339	XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) == 0) {
f96637be	340	cifs_dbg(FYI, "Security xattr namespace not supported yet\n");
ad7a2926	341	} else
f96637be JP	342	cifs_dbg(FYI,
	343	"illegal xattr request %s (only user namespace supported)\n",
	344	ea_name);
1da177e4	345
79a58d1f	346	/* We could add an additional check for streams ie
1da177e4	347	if proc/fs/cifs/streamstoxattr is set then
79a58d1f	348	search server for EAs or streams to
1da177e4 LT	349	returns as xattrs */
1da177e4 LT	350
79a58d1f SF	351	if (rc == -EINVAL)
79a58d1f SF	352	rc = -EOPNOTSUPP;
1da177e4 LT	353
1da177e4 LT	354	get_ea_exit:
f99d49ad	355	kfree(full_path);
6d5786a3	356	free_xid(xid);
7ffec372	357	cifs_put_tlink(tlink);
1da177e4 LT	358	#endif
	359	return rc;
	360	}
	361
79a58d1f	362	ssize_t cifs_listxattr(struct dentry direntry, char data, size_t buf_size)
1da177e4 LT	363	{
	364	ssize_t rc = -EOPNOTSUPP;
	365	#ifdef CONFIG_CIFS_XATTR
6d5786a3	366	unsigned int xid;
1da177e4	367	struct cifs_sb_info *cifs_sb;
7ffec372	368	struct tcon_link *tlink;
96daf2b0	369	struct cifs_tcon *pTcon;
79a58d1f SF	370	struct super_block *sb;
79a58d1f SF	371	char *full_path;
1da177e4	372
79a58d1f	373	if (direntry == NULL)
1da177e4	374	return -EIO;
79a58d1f	375	if (direntry->d_inode == NULL)
1da177e4 LT	376	return -EIO;
1da177e4 LT	377	sb = direntry->d_inode->i_sb;
79a58d1f	378	if (sb == NULL)
1da177e4	379	return -EIO;
1da177e4 LT	380
1da177e4 LT	381	cifs_sb = CIFS_SB(sb);
79a58d1f	382	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
ea4c07d7 SF	383	return -EOPNOTSUPP;
ea4c07d7 SF	384
7ffec372 JL	385	tlink = cifs_sb_tlink(cifs_sb);
	386	if (IS_ERR(tlink))
	387	return PTR_ERR(tlink);
	388	pTcon = tlink_tcon(tlink);
	389
6d5786a3	390	xid = get_xid();
ea4c07d7	391
1da177e4	392	full_path = build_path_from_dentry(direntry);
79a58d1f	393	if (full_path == NULL) {
0f3bc09e	394	rc = -ENOMEM;
7ffec372	395	goto list_ea_exit;
1da177e4 LT	396	}
	397	/* return dos attributes as pseudo xattr */
	398	/* return alt name if available as pseudo attr */
	399
	400	/* if proc/fs/cifs/streamstoxattr is set then
79a58d1f	401	search server for EAs or streams to
1da177e4	402	returns as xattrs */
31c0519f JL	403	rc = CIFSSMBQAllEAs(xid, pTcon, full_path, NULL, data,
31c0519f JL	404	buf_size, cifs_sb->local_nls,
79a58d1f	405	cifs_sb->mnt_cifs_flags &
737b758c	406	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4	407
7ffec372	408	list_ea_exit:
f99d49ad	409	kfree(full_path);
6d5786a3	410	free_xid(xid);
7ffec372	411	cifs_put_tlink(tlink);
1da177e4 LT	412	#endif
	413	return rc;
	414	}