[mirror_ubuntu-bionic-kernel.git] / fs / cifs / ioctl.c

/*
 *   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 <linux/btrfs.h>

#define CIFS_IOCTL_MAGIC	0xCF
#define CIFS_IOC_COPYCHUNK_FILE	_IOW(CIFS_IOCTL_MAGIC, 3, int)

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->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 if source and target are on same tree connection */
	if (src_tcon != target_tcon) {
		cifs_dbg(VFS, "file copy src and target on different volume\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;
}

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_dbg(FYI, "ioctl file %p  cmd %u  arg %lu\n", filep, command, arg);

	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;
		default:
			cifs_dbg(FYI, "unsupported ioctl\n");
			break;
	}

	free_xid(xid);
	return rc;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* fs/cifs/ioctl.c
	3	*
	4	* vfs operations that deal with io control
	5	*
64a5cfa6	6	* Copyright (C) International Business Machines Corp., 2005,2013
1da177e4 LT	7	* Author(s): Steve French (sfrench@us.ibm.com)
	8	*
	9	* This library is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU Lesser General Public License as published
	11	* by the Free Software Foundation; either version 2.1 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This library is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	17	* the GNU Lesser General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU Lesser General Public License
	20	* along with this library; if not, write to the Free Software
	21	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	22	*/
f654bac2	23
1da177e4	24	#include <linux/fs.h>
41c1358e SF	25	#include <linux/file.h>
	26	#include <linux/mount.h>
	27	#include <linux/mm.h>
	28	#include <linux/pagemap.h>
1da177e4 LT	29	#include "cifspdu.h"
	30	#include "cifsglob.h"
	31	#include "cifsproto.h"
	32	#include "cifs_debug.h"
c67593a0	33	#include "cifsfs.h"
02b16665	34	#include <linux/btrfs.h>
1da177e4	35
f19e84df SF	36	#define CIFS_IOCTL_MAGIC 0xCF
	37	#define CIFS_IOC_COPYCHUNK_FILE _IOW(CIFS_IOCTL_MAGIC, 3, int)
	38
41c1358e	39	static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
02b16665 SF	40	unsigned long srcfd, u64 off, u64 len, u64 destoff,
02b16665 SF	41	bool dup_extents)
41c1358e SF	42	{
	43	int rc;
	44	struct cifsFileInfo *smb_file_target = dst_file->private_data;
	45	struct inode *target_inode = file_inode(dst_file);
	46	struct cifs_tcon *target_tcon;
	47	struct fd src_file;
	48	struct cifsFileInfo *smb_file_src;
	49	struct inode *src_inode;
	50	struct cifs_tcon *src_tcon;
	51
	52	cifs_dbg(FYI, "ioctl clone range\n");
	53	/* the destination must be opened for writing */
	54	if (!(dst_file->f_mode & FMODE_WRITE)) {
	55	cifs_dbg(FYI, "file target not open for write\n");
	56	return -EINVAL;
	57	}
	58
	59	/* check if target volume is readonly and take reference */
	60	rc = mnt_want_write_file(dst_file);
	61	if (rc) {
	62	cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
	63	return rc;
	64	}
	65
	66	src_file = fdget(srcfd);
	67	if (!src_file.file) {
	68	rc = -EBADF;
	69	goto out_drop_write;
	70	}
	71
	72	if ((!src_file.file->private_data) \|\| (!dst_file->private_data)) {
	73	rc = -EBADF;
	74	cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
	75	goto out_fput;
	76	}
	77
	78	rc = -EXDEV;
	79	smb_file_target = dst_file->private_data;
	80	smb_file_src = src_file.file->private_data;
	81	src_tcon = tlink_tcon(smb_file_src->tlink);
	82	target_tcon = tlink_tcon(smb_file_target->tlink);
	83
	84	/* check if source and target are on same tree connection */
	85	if (src_tcon != target_tcon) {
	86	cifs_dbg(VFS, "file copy src and target on different volume\n");
	87	goto out_fput;
	88	}
	89
2d4f84bd	90	src_inode = file_inode(src_file.file);
378ff1a5 AV	91	rc = -EINVAL;
	92	if (S_ISDIR(src_inode->i_mode))
	93	goto out_fput;
41c1358e SF	94
	95	/*
	96	* Note: cifs case is easier than btrfs since server responsible for
	97	* checks for proper open modes and file type and if it wants
	98	* server could even support copy of range where source = target
	99	*/
378ff1a5	100	lock_two_nondirectories(target_inode, src_inode);
41c1358e SF	101
	102	/* determine range to clone */
	103	rc = -EINVAL;
	104	if (off + len > src_inode->i_size \|\| off + len < off)
	105	goto out_unlock;
	106	if (len == 0)
	107	len = src_inode->i_size - off;
	108
	109	cifs_dbg(FYI, "about to flush pages\n");
	110	/* should we flush first and last page first */
	111	truncate_inode_pages_range(&target_inode->i_data, destoff,
	112	PAGE_CACHE_ALIGN(destoff + len)-1);
	113
02b16665 SF	114	if (dup_extents && target_tcon->ses->server->ops->duplicate_extents)
	115	rc = target_tcon->ses->server->ops->duplicate_extents(xid,
	116	smb_file_src, smb_file_target, off, len, destoff);
	117	else if (!dup_extents && target_tcon->ses->server->ops->clone_range)
41c1358e SF	118	rc = target_tcon->ses->server->ops->clone_range(xid,
41c1358e SF	119	smb_file_src, smb_file_target, off, len, destoff);
02b16665 SF	120	else
02b16665 SF	121	rc = -EOPNOTSUPP;
41c1358e SF	122
	123	/* force revalidate of size and timestamps of target file now
	124	that target is updated on the server */
	125	CIFS_I(target_inode)->time = 0;
	126	out_unlock:
	127	/* although unlocking in the reverse order from locking is not
	128	strictly necessary here it is a little cleaner to be consistent */
378ff1a5	129	unlock_two_nondirectories(src_inode, target_inode);
41c1358e SF	130	out_fput:
	131	fdput(src_file);
	132	out_drop_write:
	133	mnt_drop_write_file(dst_file);
	134	return rc;
	135	}
	136
f9ddcca4	137	long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
1da177e4	138	{
496ad9aa	139	struct inode *inode = file_inode(filep);
1da177e4	140	int rc = -ENOTTY; /* strange error - but the precedent */
6d5786a3	141	unsigned int xid;
c81156dd	142	struct cifs_sb_info *cifs_sb;
ba00ba64	143	struct cifsFileInfo *pSMBFile = filep->private_data;
96daf2b0	144	struct cifs_tcon *tcon;
f654bac2	145	__u64 ExtAttrBits = 0;
61876395	146	__u64 caps;
f654bac2	147
6d5786a3	148	xid = get_xid();
f654bac2	149
f96637be	150	cifs_dbg(FYI, "ioctl file %p cmd %u arg %lu\n", filep, command, arg);
f28ac91b	151
f654bac2	152	cifs_sb = CIFS_SB(inode->i_sb);
f654bac2	153
5fdae1f6	154	switch (command) {
36695673	155	case FS_IOC_GETFLAGS:
61876395 JL	156	if (pSMBFile == NULL)
	157	break;
	158	tcon = tlink_tcon(pSMBFile->tlink);
	159	caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
64a5cfa6	160	#ifdef CONFIG_CIFS_POSIX
5fdae1f6	161	if (CIFS_UNIX_EXTATTR_CAP & caps) {
f10d9ba4	162	__u64 ExtAttrMask = 0;
4b4de76e PS	163	rc = CIFSGetExtAttr(xid, tcon,
	164	pSMBFile->fid.netfid,
	165	&ExtAttrBits, &ExtAttrMask);
5fdae1f6	166	if (rc == 0)
f654bac2	167	rc = put_user(ExtAttrBits &
36695673	168	FS_FL_USER_VISIBLE,
f654bac2	169	(int __user *)arg);
64a5cfa6 SF	170	if (rc != EOPNOTSUPP)
	171	break;
	172	}
	173	#endif /* CONFIG_CIFS_POSIX */
	174	rc = 0;
	175	if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
	176	/* add in the compressed bit */
	177	ExtAttrBits = FS_COMPR_FL;
	178	rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
	179	(int __user *)arg);
f654bac2 SF	180	}
f654bac2 SF	181	break;
36695673	182	case FS_IOC_SETFLAGS:
61876395 JL	183	if (pSMBFile == NULL)
	184	break;
	185	tcon = tlink_tcon(pSMBFile->tlink);
	186	caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
64a5cfa6 SF	187
	188	if (get_user(ExtAttrBits, (int __user *)arg)) {
	189	rc = -EFAULT;
	190	break;
	191	}
	192
	193	/*
	194	* if (CIFS_UNIX_EXTATTR_CAP & caps)
	195	* rc = CIFSSetExtAttr(xid, tcon,
	196	* pSMBFile->fid.netfid,
	197	* extAttrBits,
	198	* &ExtAttrMask);
	199	* if (rc != EOPNOTSUPP)
	200	* break;
	201	*/
	202
	203	/* Currently only flag we can set is compressed flag */
	204	if ((ExtAttrBits & FS_COMPR_FL) == 0)
	205	break;
	206
	207	/* Try to set compress flag */
	208	if (tcon->ses->server->ops->set_compression) {
	209	rc = tcon->ses->server->ops->set_compression(
	210	xid, tcon, pSMBFile);
	211	cifs_dbg(FYI, "set compress flag rc %d\n", rc);
f654bac2	212	}
f654bac2	213	break;
f19e84df	214	case CIFS_IOC_COPYCHUNK_FILE:
02b16665 SF	215	rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, false);
	216	break;
	217	case BTRFS_IOC_CLONE:
	218	rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, true);
41c1358e	219	break;
1da177e4	220	default:
f96637be	221	cifs_dbg(FYI, "unsupported ioctl\n");
f28ac91b	222	break;
1da177e4	223	}
f654bac2	224
6d5786a3	225	free_xid(xid);
1da177e4	226	return rc;
5fdae1f6	227	}