fs/cifs/ioctl.c - kernel/bruno - Git at Google

 /*
  *   fs/cifs/ioctl.c
  *
  *   vfs operations that deal with io control
  *
  *   Copyright (C) International Business Machines  Corp., 2005,2013
  *   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/file.h>
 #include <linux/mount.h>
 #include <linux/mm.h>
 #include <linux/pagemap.h>
 #include "cifspdu.h"
 #include "cifsglob.h"
 #include "cifsproto.h"
 #include "cifs_debug.h"
 #include "cifsfs.h"
 #include "cifs_ioctl.h"
 #include <linux/btrfs.h>

 static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
 			unsigned long srcfd, u64 off, u64 len, u64 destoff,
 			bool dup_extents)
 {
 	int rc;
 	struct cifsFileInfo *smb_file_target = dst_file->private_data;
 	struct inode *target_inode = file_inode(dst_file);
 	struct cifs_tcon *target_tcon;
 	struct fd src_file;
 	struct cifsFileInfo *smb_file_src;
 	struct inode *src_inode;
 	struct cifs_tcon *src_tcon;

 	cifs_dbg(FYI, "ioctl clone range\n");
 	/* the destination must be opened for writing */
 	if (!(dst_file->f_mode & FMODE_WRITE)) {
 		cifs_dbg(FYI, "file target not open for write\n");
 		return -EINVAL;
 	}

 	/* check if target volume is readonly and take reference */
 	rc = mnt_want_write_file(dst_file);
 	if (rc) {
 		cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
 		return rc;
 	}

 	src_file = fdget(srcfd);
 	if (!src_file.file) {
 		rc = -EBADF;
 		goto out_drop_write;
 	}

 	if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) {
 		rc = -EBADF;
 		cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
 		goto out_fput;
 	}

 	if ((!src_file.file->private_data) || (!dst_file->private_data)) {
 		rc = -EBADF;
 		cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
 		goto out_fput;
 	}

 	rc = -EXDEV;
 	smb_file_target = dst_file->private_data;
 	smb_file_src = src_file.file->private_data;
 	src_tcon = tlink_tcon(smb_file_src->tlink);
 	target_tcon = tlink_tcon(smb_file_target->tlink);

 	/* check source and target on same server (or volume if dup_extents) */
 	if (dup_extents && (src_tcon != target_tcon)) {
 		cifs_dbg(VFS, "source and target of copy not on same share\n");
 		goto out_fput;
 	}

 	if (!dup_extents && (src_tcon->ses != target_tcon->ses)) {
 		cifs_dbg(VFS, "source and target of copy not on same server\n");
 		goto out_fput;
 	}

 	src_inode = file_inode(src_file.file);
 	rc = -EINVAL;
 	if (S_ISDIR(src_inode->i_mode))
 		goto out_fput;

 	/*
 	 * Note: cifs case is easier than btrfs since server responsible for
 	 * checks for proper open modes and file type and if it wants
 	 * server could even support copy of range where source = target
 	 */
 	lock_two_nondirectories(target_inode, src_inode);

 	/* determine range to clone */
 	rc = -EINVAL;
 	if (off + len > src_inode->i_size || off + len < off)
 		goto out_unlock;
 	if (len == 0)
 		len = src_inode->i_size - off;

 	cifs_dbg(FYI, "about to flush pages\n");
 	/* should we flush first and last page first */
 	truncate_inode_pages_range(&target_inode->i_data, destoff,
 				   PAGE_CACHE_ALIGN(destoff + len)-1);

 	if (dup_extents && target_tcon->ses->server->ops->duplicate_extents)
 		rc = target_tcon->ses->server->ops->duplicate_extents(xid,
 			smb_file_src, smb_file_target, off, len, destoff);
 	else if (!dup_extents && target_tcon->ses->server->ops->clone_range)
 		rc = target_tcon->ses->server->ops->clone_range(xid,
 			smb_file_src, smb_file_target, off, len, destoff);
 	else
 		rc = -EOPNOTSUPP;

 	/* force revalidate of size and timestamps of target file now
 	   that target is updated on the server */
 	CIFS_I(target_inode)->time = 0;
 out_unlock:
 	/* although unlocking in the reverse order from locking is not
 	   strictly necessary here it is a little cleaner to be consistent */
 	unlock_two_nondirectories(src_inode, target_inode);
 out_fput:
 	fdput(src_file);
 out_drop_write:
 	mnt_drop_write_file(dst_file);
 	return rc;
 }

 static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
 				void __user *arg)
 {
 	int rc = 0;
 	struct smb_mnt_fs_info *fsinf;

 	fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
 	if (fsinf == NULL)
 		return -ENOMEM;

 	fsinf->version = 1;
 	fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
 	fsinf->device_characteristics =
 			le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
 	fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
 	fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
 	fsinf->max_path_component =
 		le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
 #ifdef CONFIG_CIFS_SMB2
 	fsinf->vol_serial_number = tcon->vol_serial_number;
 	fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
 	fsinf->share_flags = tcon->share_flags;
 	fsinf->share_caps = le32_to_cpu(tcon->capabilities);
 	fsinf->sector_flags = tcon->ss_flags;
 	fsinf->optimal_sector_size = tcon->perf_sector_size;
 	fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
 	fsinf->maximal_access = tcon->maximal_access;
 #endif /* SMB2 */
 	fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);

 	if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
 		rc = -EFAULT;

 	kfree(fsinf);
 	return rc;
 }

 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
 {
 	struct inode *inode = file_inode(filep);
 	int rc = -ENOTTY; /* strange error - but the precedent */
 	unsigned int xid;
 	struct cifs_sb_info *cifs_sb;
 	struct cifsFileInfo *pSMBFile = filep->private_data;
 	struct cifs_tcon *tcon;
 	__u64	ExtAttrBits = 0;
 	__u64   caps;

 	xid = get_xid();

 	cifs_sb = CIFS_SB(inode->i_sb);

 	switch (command) {
 		case FS_IOC_GETFLAGS:
 			if (pSMBFile == NULL)
 				break;
 			tcon = tlink_tcon(pSMBFile->tlink);
 			caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
 #ifdef CONFIG_CIFS_POSIX
 			if (CIFS_UNIX_EXTATTR_CAP & caps) {
 				__u64	ExtAttrMask = 0;
 				rc = CIFSGetExtAttr(xid, tcon,
 						    pSMBFile->fid.netfid,
 						    &ExtAttrBits, &ExtAttrMask);
 				if (rc == 0)
 					rc = put_user(ExtAttrBits &
 						FS_FL_USER_VISIBLE,
 						(int __user *)arg);
 				if (rc != EOPNOTSUPP)
 					break;
 			}
 #endif /* CONFIG_CIFS_POSIX */
 			rc = 0;
 			if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
 				/* add in the compressed bit */
 				ExtAttrBits = FS_COMPR_FL;
 				rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
 					      (int __user *)arg);
 			}
 			break;
 		case FS_IOC_SETFLAGS:
 			if (pSMBFile == NULL)
 				break;
 			tcon = tlink_tcon(pSMBFile->tlink);
 			caps = le64_to_cpu(tcon->fsUnixInfo.Capability);

 			if (get_user(ExtAttrBits, (int __user *)arg)) {
 				rc = -EFAULT;
 				break;
 			}

 			/*
 			 * if (CIFS_UNIX_EXTATTR_CAP & caps)
 			 *	rc = CIFSSetExtAttr(xid, tcon,
 			 *		       pSMBFile->fid.netfid,
 			 *		       extAttrBits,
 			 *		       &ExtAttrMask);
 			 * if (rc != EOPNOTSUPP)
 			 *	break;
 			 */

 			/* Currently only flag we can set is compressed flag */
 			if ((ExtAttrBits & FS_COMPR_FL) == 0)
 				break;

 			/* Try to set compress flag */
 			if (tcon->ses->server->ops->set_compression) {
 				rc = tcon->ses->server->ops->set_compression(
 							xid, tcon, pSMBFile);
 				cifs_dbg(FYI, "set compress flag rc %d\n", rc);
 			}
 			break;
 		case CIFS_IOC_COPYCHUNK_FILE:
 			rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, false);
 			break;
 		case BTRFS_IOC_CLONE:
 			rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, true);
 			break;
 		case CIFS_IOC_SET_INTEGRITY:
 			if (pSMBFile == NULL)
 				break;
 			tcon = tlink_tcon(pSMBFile->tlink);
 			if (tcon->ses->server->ops->set_integrity)
 				rc = tcon->ses->server->ops->set_integrity(xid,
 						tcon, pSMBFile);
 			else
 				rc = -EOPNOTSUPP;
 			break;
 		case CIFS_IOC_GET_MNT_INFO:
 			tcon = tlink_tcon(pSMBFile->tlink);
 			rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
 			break;
 		default:
 			cifs_dbg(FYI, "unsupported ioctl\n");
 			break;
 	}

 	free_xid(xid);
 	return rc;
 }
	/*
	* fs/cifs/ioctl.c
	*
	* vfs operations that deal with io control
	*
	* Copyright (C) International Business Machines Corp., 2005,2013
	* 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/file.h>
	#include <linux/mount.h>
	#include <linux/mm.h>
	#include <linux/pagemap.h>
	#include "cifspdu.h"
	#include "cifsglob.h"
	#include "cifsproto.h"
	#include "cifs_debug.h"
	#include "cifsfs.h"
	#include "cifs_ioctl.h"
	#include <linux/btrfs.h>

	static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
	unsigned long srcfd, u64 off, u64 len, u64 destoff,
	bool dup_extents)
	{
	int rc;
	struct cifsFileInfo *smb_file_target = dst_file->private_data;
	struct inode *target_inode = file_inode(dst_file);
	struct cifs_tcon *target_tcon;
	struct fd src_file;
	struct cifsFileInfo *smb_file_src;
	struct inode *src_inode;
	struct cifs_tcon *src_tcon;

	cifs_dbg(FYI, "ioctl clone range\n");
	/* the destination must be opened for writing */
	if (!(dst_file->f_mode & FMODE_WRITE)) {
	cifs_dbg(FYI, "file target not open for write\n");
	return -EINVAL;
	}

	/* check if target volume is readonly and take reference */
	rc = mnt_want_write_file(dst_file);
	if (rc) {
	cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
	return rc;
	}

	src_file = fdget(srcfd);
	if (!src_file.file) {
	rc = -EBADF;
	goto out_drop_write;
	}

	if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) {
	rc = -EBADF;
	cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
	goto out_fput;
	}

	if ((!src_file.file->private_data) \|\| (!dst_file->private_data)) {
	rc = -EBADF;
	cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
	goto out_fput;
	}

	rc = -EXDEV;
	smb_file_target = dst_file->private_data;
	smb_file_src = src_file.file->private_data;
	src_tcon = tlink_tcon(smb_file_src->tlink);
	target_tcon = tlink_tcon(smb_file_target->tlink);

	/* check source and target on same server (or volume if dup_extents) */
	if (dup_extents && (src_tcon != target_tcon)) {
	cifs_dbg(VFS, "source and target of copy not on same share\n");
	goto out_fput;
	}

	if (!dup_extents && (src_tcon->ses != target_tcon->ses)) {
	cifs_dbg(VFS, "source and target of copy not on same server\n");
	goto out_fput;
	}

	src_inode = file_inode(src_file.file);
	rc = -EINVAL;
	if (S_ISDIR(src_inode->i_mode))
	goto out_fput;

	/*
	* Note: cifs case is easier than btrfs since server responsible for
	* checks for proper open modes and file type and if it wants
	* server could even support copy of range where source = target
	*/
	lock_two_nondirectories(target_inode, src_inode);

	/* determine range to clone */
	rc = -EINVAL;
	if (off + len > src_inode->i_size \|\| off + len < off)
	goto out_unlock;
	if (len == 0)
	len = src_inode->i_size - off;

	cifs_dbg(FYI, "about to flush pages\n");
	/* should we flush first and last page first */
	truncate_inode_pages_range(&target_inode->i_data, destoff,
	PAGE_CACHE_ALIGN(destoff + len)-1);

	if (dup_extents && target_tcon->ses->server->ops->duplicate_extents)
	rc = target_tcon->ses->server->ops->duplicate_extents(xid,
	smb_file_src, smb_file_target, off, len, destoff);
	else if (!dup_extents && target_tcon->ses->server->ops->clone_range)
	rc = target_tcon->ses->server->ops->clone_range(xid,
	smb_file_src, smb_file_target, off, len, destoff);
	else
	rc = -EOPNOTSUPP;

	/* force revalidate of size and timestamps of target file now
	that target is updated on the server */
	CIFS_I(target_inode)->time = 0;
	out_unlock:
	/* although unlocking in the reverse order from locking is not
	strictly necessary here it is a little cleaner to be consistent */
	unlock_two_nondirectories(src_inode, target_inode);
	out_fput:
	fdput(src_file);
	out_drop_write:
	mnt_drop_write_file(dst_file);
	return rc;
	}

	static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
	void __user *arg)
	{
	int rc = 0;
	struct smb_mnt_fs_info *fsinf;

	fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
	if (fsinf == NULL)
	return -ENOMEM;

	fsinf->version = 1;
	fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
	fsinf->device_characteristics =
	le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
	fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
	fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
	fsinf->max_path_component =
	le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
	#ifdef CONFIG_CIFS_SMB2
	fsinf->vol_serial_number = tcon->vol_serial_number;
	fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
	fsinf->share_flags = tcon->share_flags;
	fsinf->share_caps = le32_to_cpu(tcon->capabilities);
	fsinf->sector_flags = tcon->ss_flags;
	fsinf->optimal_sector_size = tcon->perf_sector_size;
	fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
	fsinf->maximal_access = tcon->maximal_access;
	#endif /* SMB2 */
	fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);

	if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
	rc = -EFAULT;

	kfree(fsinf);
	return rc;
	}

	long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
	{
	struct inode *inode = file_inode(filep);
	int rc = -ENOTTY; /* strange error - but the precedent */
	unsigned int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsFileInfo *pSMBFile = filep->private_data;
	struct cifs_tcon *tcon;
	__u64 ExtAttrBits = 0;
	__u64 caps;

	xid = get_xid();

	cifs_sb = CIFS_SB(inode->i_sb);

	switch (command) {
	case FS_IOC_GETFLAGS:
	if (pSMBFile == NULL)
	break;
	tcon = tlink_tcon(pSMBFile->tlink);
	caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
	#ifdef CONFIG_CIFS_POSIX
	if (CIFS_UNIX_EXTATTR_CAP & caps) {
	__u64 ExtAttrMask = 0;
	rc = CIFSGetExtAttr(xid, tcon,
	pSMBFile->fid.netfid,
	&ExtAttrBits, &ExtAttrMask);
	if (rc == 0)
	rc = put_user(ExtAttrBits &
	FS_FL_USER_VISIBLE,
	(int __user *)arg);
	if (rc != EOPNOTSUPP)
	break;
	}
	#endif /* CONFIG_CIFS_POSIX */
	rc = 0;
	if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
	/* add in the compressed bit */
	ExtAttrBits = FS_COMPR_FL;
	rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
	(int __user *)arg);
	}
	break;
	case FS_IOC_SETFLAGS:
	if (pSMBFile == NULL)
	break;
	tcon = tlink_tcon(pSMBFile->tlink);
	caps = le64_to_cpu(tcon->fsUnixInfo.Capability);

	if (get_user(ExtAttrBits, (int __user *)arg)) {
	rc = -EFAULT;
	break;
	}

	/*
	* if (CIFS_UNIX_EXTATTR_CAP & caps)
	* rc = CIFSSetExtAttr(xid, tcon,
	* pSMBFile->fid.netfid,
	* extAttrBits,
	* &ExtAttrMask);
	* if (rc != EOPNOTSUPP)
	* break;
	*/

	/* Currently only flag we can set is compressed flag */
	if ((ExtAttrBits & FS_COMPR_FL) == 0)
	break;

	/* Try to set compress flag */
	if (tcon->ses->server->ops->set_compression) {
	rc = tcon->ses->server->ops->set_compression(
	xid, tcon, pSMBFile);
	cifs_dbg(FYI, "set compress flag rc %d\n", rc);
	}
	break;
	case CIFS_IOC_COPYCHUNK_FILE:
	rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, false);
	break;
	case BTRFS_IOC_CLONE:
	rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, true);
	break;
	case CIFS_IOC_SET_INTEGRITY:
	if (pSMBFile == NULL)
	break;
	tcon = tlink_tcon(pSMBFile->tlink);
	if (tcon->ses->server->ops->set_integrity)
	rc = tcon->ses->server->ops->set_integrity(xid,
	tcon, pSMBFile);
	else
	rc = -EOPNOTSUPP;
	break;
	case CIFS_IOC_GET_MNT_INFO:
	tcon = tlink_tcon(pSMBFile->tlink);
	rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
	break;
	default:
	cifs_dbg(FYI, "unsupported ioctl\n");
	break;
	}

	free_xid(xid);
	return rc;
	}