fs/cifs/xattr.c - kernel/msm-4.19 - 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"
 #include "cifs_fs_sb.h"
 #include "cifs_unicode.h"

 #define MAX_EA_VALUE_SIZE 65535
 #define CIFS_XATTR_CIFS_ACL "system.cifs_acl"

 /* 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 };

 static int cifs_xattr_set(const struct xattr_handler *handler,
 			  struct dentry *dentry, const char *name,
 			  const void *value, size_t size, int flags)
 {
 	int rc = -EOPNOTSUPP;
 	unsigned int xid;
 	struct super_block *sb = dentry->d_sb;
 	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 	struct tcon_link *tlink;
 	struct cifs_tcon *pTcon;
 	char *full_path;

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

 	xid = get_xid();

 	full_path = build_path_from_dentry(dentry);
 	if (full_path == NULL) {
 		rc = -ENOMEM;
 		goto out;
 	}
 	/* return dos attributes as pseudo xattr */
 	/* return alt name if available as pseudo attr */

 	/* if proc/fs/cifs/streamstoxattr is set then
 		search server for EAs or streams to
 		returns as xattrs */
 	if (size > MAX_EA_VALUE_SIZE) {
 		cifs_dbg(FYI, "size of EA value too large\n");
 		rc = -EOPNOTSUPP;
 		goto out;
 	}

 	switch (handler->flags) {
 	case XATTR_USER:
 		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_remap(cifs_sb));
 		break;

 	case XATTR_CIFS_ACL: {
 #ifdef CONFIG_CIFS_ACL
 		struct cifs_ntsd *pacl;

 		if (!value)
 			goto out;
 		pacl = kmalloc(size, GFP_KERNEL);
 		if (!pacl) {
 			rc = -ENOMEM;
 		} else {
 			memcpy(pacl, value, size);
 			if (value &&
 			    pTcon->ses->server->ops->set_acl)
 				rc = pTcon->ses->server->ops->set_acl(pacl,
 						size, d_inode(dentry),
 						full_path, CIFS_ACL_DACL);
 			else
 				rc = -EOPNOTSUPP;
 			if (rc == 0) /* force revalidate of the inode */
 				CIFS_I(d_inode(dentry))->time = 0;
 			kfree(pacl);
 		}
 #endif /* CONFIG_CIFS_ACL */
 		break;
 	}

 	case XATTR_ACL_ACCESS:
 #ifdef CONFIG_CIFS_POSIX
 		if (!value)
 			goto out;
 		if (sb->s_flags & MS_POSIXACL)
 			rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
 				value, (const int)size,
 				ACL_TYPE_ACCESS, cifs_sb->local_nls,
 				cifs_remap(cifs_sb));
 #endif  /* CONFIG_CIFS_POSIX */
 		break;

 	case XATTR_ACL_DEFAULT:
 #ifdef CONFIG_CIFS_POSIX
 		if (!value)
 			goto out;
 		if (sb->s_flags & MS_POSIXACL)
 			rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
 				value, (const int)size,
 				ACL_TYPE_DEFAULT, cifs_sb->local_nls,
 				cifs_remap(cifs_sb));
 #endif  /* CONFIG_CIFS_POSIX */
 		break;
 	}

 out:
 	kfree(full_path);
 	free_xid(xid);
 	cifs_put_tlink(tlink);
 	return rc;
 }

 static int cifs_xattr_get(const struct xattr_handler *handler,
 			  struct dentry *dentry, struct inode *inode,
 			  const char *name, void *value, size_t size)
 {
 	ssize_t rc = -EOPNOTSUPP;
 	unsigned int xid;
 	struct super_block *sb = dentry->d_sb;
 	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 	struct tcon_link *tlink;
 	struct cifs_tcon *pTcon;
 	char *full_path;

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

 	xid = get_xid();

 	full_path = build_path_from_dentry(dentry);
 	if (full_path == NULL) {
 		rc = -ENOMEM;
 		goto out;
 	}
 	/* return dos attributes as pseudo xattr */
 	/* return alt name if available as pseudo attr */
 	switch (handler->flags) {
 	case XATTR_USER:
 		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->local_nls, cifs_remap(cifs_sb));
 		break;

 	case XATTR_CIFS_ACL: {
 #ifdef CONFIG_CIFS_ACL
 		u32 acllen;
 		struct cifs_ntsd *pacl;

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

 		pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
 				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 (value) {
 				if (acllen > size)
 					acllen = -ERANGE;
 				else
 					memcpy(value, pacl, acllen);
 			}
 			rc = acllen;
 			kfree(pacl);
 		}
 #endif  /* CONFIG_CIFS_ACL */
 		break;
 	}

 	case XATTR_ACL_ACCESS:
 #ifdef CONFIG_CIFS_POSIX
 		if (sb->s_flags & MS_POSIXACL)
 			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
 				value, size, ACL_TYPE_ACCESS,
 				cifs_sb->local_nls,
 				cifs_remap(cifs_sb));
 #endif  /* CONFIG_CIFS_POSIX */
 		break;

 	case XATTR_ACL_DEFAULT:
 #ifdef CONFIG_CIFS_POSIX
 		if (sb->s_flags & MS_POSIXACL)
 			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
 				value, size, ACL_TYPE_DEFAULT,
 				cifs_sb->local_nls,
 				cifs_remap(cifs_sb));
 #endif  /* CONFIG_CIFS_POSIX */
 		break;
 	}

 	/* We could add an additional check for streams ie
 	    if proc/fs/cifs/streamstoxattr is set then
 		search server for EAs or streams to
 		returns as xattrs */

 	if (rc == -EINVAL)
 		rc = -EOPNOTSUPP;

 out:
 	kfree(full_path);
 	free_xid(xid);
 	cifs_put_tlink(tlink);
 	return rc;
 }

 ssize_t cifs_listxattr(struct dentry *direntry, char *data, size_t buf_size)
 {
 	ssize_t rc = -EOPNOTSUPP;
 	unsigned int xid;
 	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
 	struct tcon_link *tlink;
 	struct cifs_tcon *pTcon;
 	char *full_path;

 	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 		return -EOPNOTSUPP;

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

 	xid = get_xid();

 	full_path = build_path_from_dentry(direntry);
 	if (full_path == NULL) {
 		rc = -ENOMEM;
 		goto list_ea_exit;
 	}
 	/* return dos attributes as pseudo xattr */
 	/* return alt name if available as pseudo attr */

 	/* if proc/fs/cifs/streamstoxattr is set then
 		search server for EAs or streams to
 		returns as xattrs */

 	if (pTcon->ses->server->ops->query_all_EAs)
 		rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
 				full_path, NULL, data, buf_size,
 				cifs_sb->local_nls, cifs_remap(cifs_sb));
 list_ea_exit:
 	kfree(full_path);
 	free_xid(xid);
 	cifs_put_tlink(tlink);
 	return rc;
 }

 static const struct xattr_handler cifs_user_xattr_handler = {
 	.prefix = XATTR_USER_PREFIX,
 	.flags = XATTR_USER,
 	.get = cifs_xattr_get,
 	.set = cifs_xattr_set,
 };

 /* os2.* attributes are treated like user.* attributes */
 static const struct xattr_handler cifs_os2_xattr_handler = {
 	.prefix = XATTR_OS2_PREFIX,
 	.flags = XATTR_USER,
 	.get = cifs_xattr_get,
 	.set = cifs_xattr_set,
 };

 static const struct xattr_handler cifs_cifs_acl_xattr_handler = {
 	.name = CIFS_XATTR_CIFS_ACL,
 	.flags = XATTR_CIFS_ACL,
 	.get = cifs_xattr_get,
 	.set = cifs_xattr_set,
 };

 static const struct xattr_handler cifs_posix_acl_access_xattr_handler = {
 	.name = XATTR_NAME_POSIX_ACL_ACCESS,
 	.flags = XATTR_ACL_ACCESS,
 	.get = cifs_xattr_get,
 	.set = cifs_xattr_set,
 };

 static const struct xattr_handler cifs_posix_acl_default_xattr_handler = {
 	.name = XATTR_NAME_POSIX_ACL_DEFAULT,
 	.flags = XATTR_ACL_DEFAULT,
 	.get = cifs_xattr_get,
 	.set = cifs_xattr_set,
 };

 const struct xattr_handler *cifs_xattr_handlers[] = {
 	&cifs_user_xattr_handler,
 	&cifs_os2_xattr_handler,
 	&cifs_cifs_acl_xattr_handler,
 	&cifs_posix_acl_access_xattr_handler,
 	&cifs_posix_acl_default_xattr_handler,
 	NULL
 };
	/*
	* fs/cifs/xattr.c
	*
	* Copyright (c) International Business Machines Corp., 2003, 2007
	* Author(s): Steve French (sfrench@us.ibm.com)
	*
	* This library is free software; you can redistribute it and/or modify
	* it under the terms of the GNU Lesser General Public License as published
	* by the Free Software Foundation; either version 2.1 of the License, or
	* (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	* the GNU Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public License
	* along with this library; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	#include <linux/fs.h>
	#include <linux/posix_acl_xattr.h>
	#include <linux/slab.h>
	#include <linux/xattr.h>
	#include "cifsfs.h"
	#include "cifspdu.h"
	#include "cifsglob.h"
	#include "cifsproto.h"
	#include "cifs_debug.h"
	#include "cifs_fs_sb.h"
	#include "cifs_unicode.h"

	#define MAX_EA_VALUE_SIZE 65535
	#define CIFS_XATTR_CIFS_ACL "system.cifs_acl"

	/* 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 };

	static int cifs_xattr_set(const struct xattr_handler *handler,
	struct dentry dentry, const char name,
	const void *value, size_t size, int flags)
	{
	int rc = -EOPNOTSUPP;
	unsigned int xid;
	struct super_block *sb = dentry->d_sb;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	char *full_path;

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

	xid = get_xid();

	full_path = build_path_from_dentry(dentry);
	if (full_path == NULL) {
	rc = -ENOMEM;
	goto out;
	}
	/* return dos attributes as pseudo xattr */
	/* return alt name if available as pseudo attr */

	/* if proc/fs/cifs/streamstoxattr is set then
	search server for EAs or streams to
	returns as xattrs */
	if (size > MAX_EA_VALUE_SIZE) {
	cifs_dbg(FYI, "size of EA value too large\n");
	rc = -EOPNOTSUPP;
	goto out;
	}

	switch (handler->flags) {
	case XATTR_USER:
	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_remap(cifs_sb));
	break;

	case XATTR_CIFS_ACL: {
	#ifdef CONFIG_CIFS_ACL
	struct cifs_ntsd *pacl;

	if (!value)
	goto out;
	pacl = kmalloc(size, GFP_KERNEL);
	if (!pacl) {
	rc = -ENOMEM;
	} else {
	memcpy(pacl, value, size);
	if (value &&
	pTcon->ses->server->ops->set_acl)
	rc = pTcon->ses->server->ops->set_acl(pacl,
	size, d_inode(dentry),
	full_path, CIFS_ACL_DACL);
	else
	rc = -EOPNOTSUPP;
	if (rc == 0) /* force revalidate of the inode */
	CIFS_I(d_inode(dentry))->time = 0;
	kfree(pacl);
	}
	#endif /* CONFIG_CIFS_ACL */
	break;
	}

	case XATTR_ACL_ACCESS:
	#ifdef CONFIG_CIFS_POSIX
	if (!value)
	goto out;
	if (sb->s_flags & MS_POSIXACL)
	rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
	value, (const int)size,
	ACL_TYPE_ACCESS, cifs_sb->local_nls,
	cifs_remap(cifs_sb));
	#endif /* CONFIG_CIFS_POSIX */
	break;

	case XATTR_ACL_DEFAULT:
	#ifdef CONFIG_CIFS_POSIX
	if (!value)
	goto out;
	if (sb->s_flags & MS_POSIXACL)
	rc = CIFSSMBSetPosixACL(xid, pTcon, full_path,
	value, (const int)size,
	ACL_TYPE_DEFAULT, cifs_sb->local_nls,
	cifs_remap(cifs_sb));
	#endif /* CONFIG_CIFS_POSIX */
	break;
	}

	out:
	kfree(full_path);
	free_xid(xid);
	cifs_put_tlink(tlink);
	return rc;
	}

	static int cifs_xattr_get(const struct xattr_handler *handler,
	struct dentry dentry, struct inode inode,
	const char name, void value, size_t size)
	{
	ssize_t rc = -EOPNOTSUPP;
	unsigned int xid;
	struct super_block *sb = dentry->d_sb;
	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	char *full_path;

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

	xid = get_xid();

	full_path = build_path_from_dentry(dentry);
	if (full_path == NULL) {
	rc = -ENOMEM;
	goto out;
	}
	/* return dos attributes as pseudo xattr */
	/* return alt name if available as pseudo attr */
	switch (handler->flags) {
	case XATTR_USER:
	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->local_nls, cifs_remap(cifs_sb));
	break;

	case XATTR_CIFS_ACL: {
	#ifdef CONFIG_CIFS_ACL
	u32 acllen;
	struct cifs_ntsd *pacl;

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

	pacl = pTcon->ses->server->ops->get_acl(cifs_sb,
	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 (value) {
	if (acllen > size)
	acllen = -ERANGE;
	else
	memcpy(value, pacl, acllen);
	}
	rc = acllen;
	kfree(pacl);
	}
	#endif /* CONFIG_CIFS_ACL */
	break;
	}

	case XATTR_ACL_ACCESS:
	#ifdef CONFIG_CIFS_POSIX
	if (sb->s_flags & MS_POSIXACL)
	rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
	value, size, ACL_TYPE_ACCESS,
	cifs_sb->local_nls,
	cifs_remap(cifs_sb));
	#endif /* CONFIG_CIFS_POSIX */
	break;

	case XATTR_ACL_DEFAULT:
	#ifdef CONFIG_CIFS_POSIX
	if (sb->s_flags & MS_POSIXACL)
	rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
	value, size, ACL_TYPE_DEFAULT,
	cifs_sb->local_nls,
	cifs_remap(cifs_sb));
	#endif /* CONFIG_CIFS_POSIX */
	break;
	}

	/* We could add an additional check for streams ie
	if proc/fs/cifs/streamstoxattr is set then
	search server for EAs or streams to
	returns as xattrs */

	if (rc == -EINVAL)
	rc = -EOPNOTSUPP;

	out:
	kfree(full_path);
	free_xid(xid);
	cifs_put_tlink(tlink);
	return rc;
	}

	ssize_t cifs_listxattr(struct dentry direntry, char data, size_t buf_size)
	{
	ssize_t rc = -EOPNOTSUPP;
	unsigned int xid;
	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
	struct tcon_link *tlink;
	struct cifs_tcon *pTcon;
	char *full_path;

	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
	return -EOPNOTSUPP;

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

	xid = get_xid();

	full_path = build_path_from_dentry(direntry);
	if (full_path == NULL) {
	rc = -ENOMEM;
	goto list_ea_exit;
	}
	/* return dos attributes as pseudo xattr */
	/* return alt name if available as pseudo attr */

	/* if proc/fs/cifs/streamstoxattr is set then
	search server for EAs or streams to
	returns as xattrs */

	if (pTcon->ses->server->ops->query_all_EAs)
	rc = pTcon->ses->server->ops->query_all_EAs(xid, pTcon,
	full_path, NULL, data, buf_size,
	cifs_sb->local_nls, cifs_remap(cifs_sb));
	list_ea_exit:
	kfree(full_path);
	free_xid(xid);
	cifs_put_tlink(tlink);
	return rc;
	}

	static const struct xattr_handler cifs_user_xattr_handler = {
	.prefix = XATTR_USER_PREFIX,
	.flags = XATTR_USER,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
	};

	/* os2.* attributes are treated like user.* attributes */
	static const struct xattr_handler cifs_os2_xattr_handler = {
	.prefix = XATTR_OS2_PREFIX,
	.flags = XATTR_USER,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
	};

	static const struct xattr_handler cifs_cifs_acl_xattr_handler = {
	.name = CIFS_XATTR_CIFS_ACL,
	.flags = XATTR_CIFS_ACL,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
	};

	static const struct xattr_handler cifs_posix_acl_access_xattr_handler = {
	.name = XATTR_NAME_POSIX_ACL_ACCESS,
	.flags = XATTR_ACL_ACCESS,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
	};

	static const struct xattr_handler cifs_posix_acl_default_xattr_handler = {
	.name = XATTR_NAME_POSIX_ACL_DEFAULT,
	.flags = XATTR_ACL_DEFAULT,
	.get = cifs_xattr_get,
	.set = cifs_xattr_set,
	};

	const struct xattr_handler *cifs_xattr_handlers[] = {
	&cifs_user_xattr_handler,
	&cifs_os2_xattr_handler,
	&cifs_cifs_acl_xattr_handler,
	&cifs_posix_acl_access_xattr_handler,
	&cifs_posix_acl_default_xattr_handler,
	NULL
	};