fs/cifs/xattr.c - kernel/msm-4.9 - Gitiles

 /*
  *   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 */
 		if (pTcon->ses->server->ops->set_EA)
 			rc = pTcon->ses->server->ops->set_EA(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 */
 		if (pTcon->ses->server->ops->set_EA)
 			rc = pTcon->ses->server->ops->set_EA(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 */
 		if (pTcon->ses->server->ops->set_EA)
 			rc = pTcon->ses->server->ops->set_EA(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 */
 		if (pTcon->ses->server->ops->query_all_EAs)
 			rc = pTcon->ses->server->ops->query_all_EAs(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 */
 		if (pTcon->ses->server->ops->query_all_EAs)
 			rc = pTcon->ses->server->ops->query_all_EAs(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 */

 	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_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;
 }
	/*
	* 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 */
	if (pTcon->ses->server->ops->set_EA)
	rc = pTcon->ses->server->ops->set_EA(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 */
	if (pTcon->ses->server->ops->set_EA)
	rc = pTcon->ses->server->ops->set_EA(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 */
	if (pTcon->ses->server->ops->set_EA)
	rc = pTcon->ses->server->ops->set_EA(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 */
	if (pTcon->ses->server->ops->query_all_EAs)
	rc = pTcon->ses->server->ops->query_all_EAs(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 */
	if (pTcon->ses->server->ops->query_all_EAs)
	rc = pTcon->ses->server->ops->query_all_EAs(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 */

	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_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;
	}