fs/cifs/xattr.c - linux - Git at Google

 // SPDX-License-Identifier: LGPL-2.1
 /*
  *
  *   Copyright (c) International Business Machines  Corp., 2003, 2007
  *   Author(s): Steve French (sfrench@us.ibm.com)
  *
  */

 #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"
 #include "cifs_ioctl.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, const 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, const 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 mnt_idmap *idmap,
 			  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;
 	const char *full_path;
 	void *page;

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

 	xid = get_xid();
 	page = alloc_dentry_path();

 	full_path = build_path_from_dentry(dentry, page);
 	if (IS_ERR(full_path)) {
 		rc = PTR_ERR(full_path);
 		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_GROUP |
 						    CIFS_ACL_DACL |
 						    CIFS_ACL_SACL);
 					break;
 				case XATTR_CIFS_NTSD:
 					aclflags = (CIFS_ACL_OWNER |
 						    CIFS_ACL_GROUP |
 						    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;
 	}
 	}

 out:
 	free_dentry_path(page);
 	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;
 	const char *full_path;
 	void *page;

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

 	xid = get_xid();
 	page = alloc_dentry_path();

 	full_path = build_path_from_dentry(dentry, page);
 	if (IS_ERR(full_path)) {
 		rc = PTR_ERR(full_path);
 		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;
 	}
 	}

 	/* 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:
 	free_dentry_path(page);
 	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;
 	const char *full_path;
 	void *page;

 	if (unlikely(cifs_forced_shutdown(cifs_sb)))
 		return -EIO;

 	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();
 	page = alloc_dentry_path();

 	full_path = build_path_from_dentry(direntry, page);
 	if (IS_ERR(full_path)) {
 		rc = PTR_ERR(full_path);
 		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:
 	free_dentry_path(page);
 	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,
 };

 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" */
 #ifdef CONFIG_FS_POSIX_ACL
 	&posix_acl_access_xattr_handler,
 	&posix_acl_default_xattr_handler,
 #endif
 	NULL
 };
	// SPDX-License-Identifier: LGPL-2.1
	/*
	*
	* Copyright (c) International Business Machines Corp., 2003, 2007
	* Author(s): Steve French (sfrench@us.ibm.com)
	*
	*/

	#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"
	#include "cifs_ioctl.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, const 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, const 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 mnt_idmap *idmap,
	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;
	const char *full_path;
	void *page;

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

	xid = get_xid();
	page = alloc_dentry_path();

	full_path = build_path_from_dentry(dentry, page);
	if (IS_ERR(full_path)) {
	rc = PTR_ERR(full_path);
	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_GROUP \|
	CIFS_ACL_DACL \|
	CIFS_ACL_SACL);
	break;
	case XATTR_CIFS_NTSD:
	aclflags = (CIFS_ACL_OWNER \|
	CIFS_ACL_GROUP \|
	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;
	}
	}

	out:
	free_dentry_path(page);
	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;
	const char *full_path;
	void *page;

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

	xid = get_xid();
	page = alloc_dentry_path();

	full_path = build_path_from_dentry(dentry, page);
	if (IS_ERR(full_path)) {
	rc = PTR_ERR(full_path);
	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;
	}
	}

	/* 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:
	free_dentry_path(page);
	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;
	const char *full_path;
	void *page;

	if (unlikely(cifs_forced_shutdown(cifs_sb)))
	return -EIO;

	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();
	page = alloc_dentry_path();

	full_path = build_path_from_dentry(direntry, page);
	if (IS_ERR(full_path)) {
	rc = PTR_ERR(full_path);
	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:
	free_dentry_path(page);
	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,
	};

	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" */
	#ifdef CONFIG_FS_POSIX_ACL
	&posix_acl_access_xattr_handler,
	&posix_acl_default_xattr_handler,
	#endif
	NULL
	};