[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"

#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
	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 = GetXid();

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
		rc = -ENOMEM;
		goto remove_ea_exit;
	}
	if (ea_name == NULL) {
		cFYI(1, "Null xattr names not supported");
	} else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
		&& (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN))) {
		cFYI(1,
		     "illegal xattr request %s (only user namespace supported)",
		     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);
	FreeXid(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
	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 = GetXid();

	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) {
		cFYI(1, "size of EA value too large");
		rc = -EOPNOTSUPP;
		goto set_ea_exit;
	}

	if (ea_name == NULL) {
		cFYI(1, "Null xattr names not supported");
	} 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)
			cFYI(1, "attempt to set cifs inode metadata");

		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) {
			cFYI(1, "%s: Can't allocate memory for ACL",
					__func__);
			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
			cFYI(1, "Set CIFS ACL not supported yet");
#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);
			cFYI(1, "set POSIX ACL rc %d", rc);
#else
			cFYI(1, "set POSIX ACL not supported");
#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);
			cFYI(1, "set POSIX default ACL rc %d", rc);
#else
			cFYI(1, "set default POSIX ACL not supported");
#endif
		} else {
			cFYI(1, "illegal xattr request %s (only user namespace"
				" supported)", 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);
	FreeXid(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
	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 = GetXid();

	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) {
		cFYI(1, "Null xattr names not supported");
	} 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) {
			cFYI(1, "attempt to query cifs inode metadata");
			/* 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
		cFYI(1, "Query POSIX ACL not supported yet");
#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
		cFYI(1, "Query POSIX default ACL not supported yet");
#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);
				cERROR(1, "%s: error %zd getting sec desc",
						__func__, rc);
			} else {
				if (ea_value) {
					if (acllen > buf_size)
						acllen = -ERANGE;
					else
						memcpy(ea_value, pacl, acllen);
				}
				rc = acllen;
				kfree(pacl);
			}
#else
		cFYI(1, "Query CIFS ACL not supported yet");
#endif /* CONFIG_CIFS_ACL */
	} else if (strncmp(ea_name,
		  XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) == 0) {
		cFYI(1, "Trusted xattr namespace not supported yet");
	} else if (strncmp(ea_name,
		  XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) == 0) {
		cFYI(1, "Security xattr namespace not supported yet");
	} else
		cFYI(1,
		    "illegal xattr request %s (only user namespace supported)",
		     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);
	FreeXid(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
	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 = GetXid();

	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);
	FreeXid(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
	42	int xid;
	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
	63	xid = GetXid();
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) {
b6b38f70	71	cFYI(1, "Null xattr names not supported");
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))) {
79a58d1f	74	cFYI(1,
b6b38f70 JP	75	"illegal xattr request %s (only user namespace supported)",
b6b38f70 JP	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);
1da177e4	91	FreeXid(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
	102	int xid;
	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
	123	xid = GetXid();
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) {
b6b38f70	137	cFYI(1, "size of EA value too large");
7ffec372 JL	138	rc = -EOPNOTSUPP;
7ffec372 JL	139	goto set_ea_exit;
1da177e4 LT	140	}
1da177e4 LT	141
79a58d1f	142	if (ea_name == NULL) {
b6b38f70	143	cFYI(1, "Null xattr names not supported");
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)
b6b38f70	149	cFYI(1, "attempt to set cifs inode metadata");
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);
	169	if (!pacl) {
	170	cFYI(1, "%s: Can't allocate memory for ACL",
	171	__func__);
	172	rc = -ENOMEM;
	173	} else {
b73b9a4b SF	174	memcpy(pacl, ea_value, value_size);
b73b9a4b SF	175	rc = set_cifs_acl(pacl, value_size,
a5ff3769	176	direntry->d_inode, full_path, CIFS_ACL_DACL);
b73b9a4b SF	177	if (rc == 0) /* force revalidate of the inode */
	178	CIFS_I(direntry->d_inode)->time = 0;
	179	kfree(pacl);
b0f8ef20	180	}
b73b9a4b SF	181	#else
	182	cFYI(1, "Set CIFS ACL not supported yet");
	183	#endif /* CONFIG_CIFS_ACL */
1da177e4	184	} else {
79a58d1f SF	185	int temp;
79a58d1f SF	186	temp = strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
1da177e4 LT	187	strlen(POSIX_ACL_XATTR_ACCESS));
	188	if (temp == 0) {
	189	#ifdef CONFIG_CIFS_POSIX
79a58d1f SF	190	if (sb->s_flags & MS_POSIXACL)
	191	rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
	192	ea_value, (const int)value_size,
	193	ACL_TYPE_ACCESS, cifs_sb->local_nls,
	194	cifs_sb->mnt_cifs_flags &
737b758c	195	CIFS_MOUNT_MAP_SPECIAL_CHR);
b6b38f70	196	cFYI(1, "set POSIX ACL rc %d", rc);
1da177e4	197	#else
b6b38f70	198	cFYI(1, "set POSIX ACL not supported");
1da177e4	199	#endif
79a58d1f SF	200	} else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
79a58d1f SF	201	strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
1da177e4	202	#ifdef CONFIG_CIFS_POSIX
79a58d1f SF	203	if (sb->s_flags & MS_POSIXACL)
	204	rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
	205	ea_value, (const int)value_size,
737b758c	206	ACL_TYPE_DEFAULT, cifs_sb->local_nls,
79a58d1f	207	cifs_sb->mnt_cifs_flags &
737b758c	208	CIFS_MOUNT_MAP_SPECIAL_CHR);
b6b38f70	209	cFYI(1, "set POSIX default ACL rc %d", rc);
1da177e4	210	#else
b6b38f70	211	cFYI(1, "set default POSIX ACL not supported");
1da177e4 LT	212	#endif
1da177e4 LT	213	} else {
b6b38f70 JP	214	cFYI(1, "illegal xattr request %s (only user namespace"
b6b38f70 JP	215	" supported)", ea_name);
1da177e4	216	/* BB what if no namespace prefix? */
79a58d1f	217	/* Should we just pass them to server, except for
1da177e4 LT	218	system and perhaps security prefixes? */
	219	}
	220	}
	221
	222	set_ea_exit:
f99d49ad	223	kfree(full_path);
1da177e4	224	FreeXid(xid);
7ffec372	225	cifs_put_tlink(tlink);
1da177e4 LT	226	#endif
	227	return rc;
	228	}
	229
79a58d1f SF	230	ssize_t cifs_getxattr(struct dentry direntry, const char ea_name,
79a58d1f SF	231	void *ea_value, size_t buf_size)
1da177e4 LT	232	{
	233	ssize_t rc = -EOPNOTSUPP;
	234	#ifdef CONFIG_CIFS_XATTR
	235	int xid;
	236	struct cifs_sb_info *cifs_sb;
7ffec372	237	struct tcon_link *tlink;
96daf2b0	238	struct cifs_tcon *pTcon;
79a58d1f SF	239	struct super_block *sb;
79a58d1f SF	240	char *full_path;
1da177e4	241
79a58d1f	242	if (direntry == NULL)
1da177e4	243	return -EIO;
79a58d1f	244	if (direntry->d_inode == NULL)
1da177e4 LT	245	return -EIO;
1da177e4 LT	246	sb = direntry->d_inode->i_sb;
79a58d1f	247	if (sb == NULL)
1da177e4 LT	248	return -EIO;
1da177e4 LT	249
1da177e4	250	cifs_sb = CIFS_SB(sb);
7ffec372 JL	251	tlink = cifs_sb_tlink(cifs_sb);
	252	if (IS_ERR(tlink))
	253	return PTR_ERR(tlink);
	254	pTcon = tlink_tcon(tlink);
	255
	256	xid = GetXid();
1da177e4	257
1da177e4	258	full_path = build_path_from_dentry(direntry);
79a58d1f	259	if (full_path == NULL) {
0f3bc09e	260	rc = -ENOMEM;
7ffec372	261	goto get_ea_exit;
1da177e4 LT	262	}
	263	/* return dos attributes as pseudo xattr */
	264	/* return alt name if available as pseudo attr */
79a58d1f	265	if (ea_name == NULL) {
b6b38f70	266	cFYI(1, "Null xattr names not supported");
f995e740 MZ	267	} else if (strncmp(ea_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)
f995e740 MZ	268	== 0) {
79a58d1f	269	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
1da177e4 LT	270	goto get_ea_exit;
1da177e4 LT	271
79a58d1f	272	if (strncmp(ea_name, CIFS_XATTR_DOS_ATTRIB, 14) == 0) {
b6b38f70	273	cFYI(1, "attempt to query cifs inode metadata");
1da177e4 LT	274	/* revalidate/getattr then populate from inode */
1da177e4 LT	275	} /* BB add else when above is implemented */
f995e740	276	ea_name += XATTR_USER_PREFIX_LEN; /* skip past user. prefix */
31c0519f	277	rc = CIFSSMBQAllEAs(xid, pTcon, full_path, ea_name, ea_value,
737b758c SF	278	buf_size, cifs_sb->local_nls,
737b758c SF	279	cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
f995e740	280	} else if (strncmp(ea_name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) {
79a58d1f	281	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
1da177e4 LT	282	goto get_ea_exit;
1da177e4 LT	283
f995e740	284	ea_name += XATTR_OS2_PREFIX_LEN; /* skip past os2. prefix */
31c0519f	285	rc = CIFSSMBQAllEAs(xid, pTcon, full_path, ea_name, ea_value,
737b758c SF	286	buf_size, cifs_sb->local_nls,
737b758c SF	287	cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
79a58d1f	288	} else if (strncmp(ea_name, POSIX_ACL_XATTR_ACCESS,
0a4b92c0	289	strlen(POSIX_ACL_XATTR_ACCESS)) == 0) {
1da177e4	290	#ifdef CONFIG_CIFS_POSIX
79a58d1f	291	if (sb->s_flags & MS_POSIXACL)
1da0c78b	292	rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
79a58d1f	293	ea_value, buf_size, ACL_TYPE_ACCESS,
737b758c	294	cifs_sb->local_nls,
79a58d1f	295	cifs_sb->mnt_cifs_flags &
737b758c	296	CIFS_MOUNT_MAP_SPECIAL_CHR);
79a58d1f	297	#else
fbeba8bb	298	cFYI(1, "Query POSIX ACL not supported yet");
1da177e4	299	#endif /* CONFIG_CIFS_POSIX */
79a58d1f	300	} else if (strncmp(ea_name, POSIX_ACL_XATTR_DEFAULT,
0a4b92c0	301	strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
1da177e4	302	#ifdef CONFIG_CIFS_POSIX
79a58d1f	303	if (sb->s_flags & MS_POSIXACL)
1da0c78b	304	rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
79a58d1f	305	ea_value, buf_size, ACL_TYPE_DEFAULT,
737b758c	306	cifs_sb->local_nls,
79a58d1f	307	cifs_sb->mnt_cifs_flags &
737b758c	308	CIFS_MOUNT_MAP_SPECIAL_CHR);
79a58d1f	309	#else
fbeba8bb SP	310	cFYI(1, "Query POSIX default ACL not supported yet");
	311	#endif /* CONFIG_CIFS_POSIX */
	312	} else if (strncmp(ea_name, CIFS_XATTR_CIFS_ACL,
	313	strlen(CIFS_XATTR_CIFS_ACL)) == 0) {
	314	#ifdef CONFIG_CIFS_ACL
	315	u32 acllen;
	316	struct cifs_ntsd *pacl;
	317
	318	pacl = get_cifs_acl(cifs_sb, direntry->d_inode,
	319	full_path, &acllen);
	320	if (IS_ERR(pacl)) {
	321	rc = PTR_ERR(pacl);
	322	cERROR(1, "%s: error %zd getting sec desc",
	323	__func__, rc);
	324	} else {
	325	if (ea_value) {
	326	if (acllen > buf_size)
	327	acllen = -ERANGE;
	328	else
	329	memcpy(ea_value, pacl, acllen);
	330	}
	331	rc = acllen;
	332	kfree(pacl);
	333	}
	334	#else
	335	cFYI(1, "Query CIFS ACL not supported yet");
	336	#endif /* CONFIG_CIFS_ACL */
79a58d1f	337	} else if (strncmp(ea_name,
f995e740	338	XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) == 0) {
b6b38f70	339	cFYI(1, "Trusted xattr namespace not supported yet");
79a58d1f	340	} else if (strncmp(ea_name,
f995e740	341	XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) == 0) {
b6b38f70	342	cFYI(1, "Security xattr namespace not supported yet");
ad7a2926	343	} else
79a58d1f	344	cFYI(1,
b6b38f70 JP	345	"illegal xattr request %s (only user namespace supported)",
b6b38f70 JP	346	ea_name);
1da177e4	347
79a58d1f	348	/* We could add an additional check for streams ie
1da177e4	349	if proc/fs/cifs/streamstoxattr is set then
79a58d1f	350	search server for EAs or streams to
1da177e4 LT	351	returns as xattrs */
1da177e4 LT	352
79a58d1f SF	353	if (rc == -EINVAL)
79a58d1f SF	354	rc = -EOPNOTSUPP;
1da177e4 LT	355
1da177e4 LT	356	get_ea_exit:
f99d49ad	357	kfree(full_path);
1da177e4	358	FreeXid(xid);
7ffec372	359	cifs_put_tlink(tlink);
1da177e4 LT	360	#endif
	361	return rc;
	362	}
	363
79a58d1f	364	ssize_t cifs_listxattr(struct dentry direntry, char data, size_t buf_size)
1da177e4 LT	365	{
	366	ssize_t rc = -EOPNOTSUPP;
	367	#ifdef CONFIG_CIFS_XATTR
	368	int xid;
	369	struct cifs_sb_info *cifs_sb;
7ffec372	370	struct tcon_link *tlink;
96daf2b0	371	struct cifs_tcon *pTcon;
79a58d1f SF	372	struct super_block *sb;
79a58d1f SF	373	char *full_path;
1da177e4	374
79a58d1f	375	if (direntry == NULL)
1da177e4	376	return -EIO;
79a58d1f	377	if (direntry->d_inode == NULL)
1da177e4 LT	378	return -EIO;
1da177e4 LT	379	sb = direntry->d_inode->i_sb;
79a58d1f	380	if (sb == NULL)
1da177e4	381	return -EIO;
1da177e4 LT	382
1da177e4 LT	383	cifs_sb = CIFS_SB(sb);
79a58d1f	384	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
ea4c07d7 SF	385	return -EOPNOTSUPP;
ea4c07d7 SF	386
7ffec372 JL	387	tlink = cifs_sb_tlink(cifs_sb);
	388	if (IS_ERR(tlink))
	389	return PTR_ERR(tlink);
	390	pTcon = tlink_tcon(tlink);
	391
ea4c07d7 SF	392	xid = GetXid();
ea4c07d7 SF	393
1da177e4	394	full_path = build_path_from_dentry(direntry);
79a58d1f	395	if (full_path == NULL) {
0f3bc09e	396	rc = -ENOMEM;
7ffec372	397	goto list_ea_exit;
1da177e4 LT	398	}
	399	/* return dos attributes as pseudo xattr */
	400	/* return alt name if available as pseudo attr */
	401
	402	/* if proc/fs/cifs/streamstoxattr is set then
79a58d1f	403	search server for EAs or streams to
1da177e4	404	returns as xattrs */
31c0519f JL	405	rc = CIFSSMBQAllEAs(xid, pTcon, full_path, NULL, data,
31c0519f JL	406	buf_size, cifs_sb->local_nls,
79a58d1f	407	cifs_sb->mnt_cifs_flags &
737b758c	408	CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4	409
7ffec372	410	list_ea_exit:
f99d49ad	411	kfree(full_path);
1da177e4	412	FreeXid(xid);
7ffec372	413	cifs_put_tlink(tlink);
1da177e4 LT	414	#endif
	415	return rc;
	416	}