[linux.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 ([email protected])
 *
 *   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"

#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)
{
	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 (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);

	/* 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);
			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 ([email protected])
	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"
1da177e4	34
f19e84df SF	35	#define CIFS_IOCTL_MAGIC 0xCF
	36	#define CIFS_IOC_COPYCHUNK_FILE _IOW(CIFS_IOCTL_MAGIC, 3, int)
	37
41c1358e SF	38	static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
	39	unsigned long srcfd, u64 off, u64 len, u64 destoff)
	40	{
	41	int rc;
	42	struct cifsFileInfo *smb_file_target = dst_file->private_data;
	43	struct inode *target_inode = file_inode(dst_file);
	44	struct cifs_tcon *target_tcon;
	45	struct fd src_file;
	46	struct cifsFileInfo *smb_file_src;
	47	struct inode *src_inode;
	48	struct cifs_tcon *src_tcon;
	49
	50	cifs_dbg(FYI, "ioctl clone range\n");
	51	/* the destination must be opened for writing */
	52	if (!(dst_file->f_mode & FMODE_WRITE)) {
	53	cifs_dbg(FYI, "file target not open for write\n");
	54	return -EINVAL;
	55	}
	56
	57	/* check if target volume is readonly and take reference */
	58	rc = mnt_want_write_file(dst_file);
	59	if (rc) {
	60	cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
	61	return rc;
	62	}
	63
	64	src_file = fdget(srcfd);
	65	if (!src_file.file) {
	66	rc = -EBADF;
	67	goto out_drop_write;
	68	}
	69
	70	if ((!src_file.file->private_data) \|\| (!dst_file->private_data)) {
	71	rc = -EBADF;
	72	cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
	73	goto out_fput;
	74	}
	75
	76	rc = -EXDEV;
	77	smb_file_target = dst_file->private_data;
	78	smb_file_src = src_file.file->private_data;
	79	src_tcon = tlink_tcon(smb_file_src->tlink);
	80	target_tcon = tlink_tcon(smb_file_target->tlink);
	81
	82	/* check if source and target are on same tree connection */
	83	if (src_tcon != target_tcon) {
	84	cifs_dbg(VFS, "file copy src and target on different volume\n");
	85	goto out_fput;
	86	}
	87
2d4f84bd	88	src_inode = file_inode(src_file.file);
378ff1a5 AV	89	rc = -EINVAL;
	90	if (S_ISDIR(src_inode->i_mode))
	91	goto out_fput;
41c1358e SF	92
	93	/*
	94	* Note: cifs case is easier than btrfs since server responsible for
	95	* checks for proper open modes and file type and if it wants
	96	* server could even support copy of range where source = target
	97	*/
378ff1a5	98	lock_two_nondirectories(target_inode, src_inode);
41c1358e SF	99
	100	/* determine range to clone */
	101	rc = -EINVAL;
	102	if (off + len > src_inode->i_size \|\| off + len < off)
	103	goto out_unlock;
	104	if (len == 0)
	105	len = src_inode->i_size - off;
	106
	107	cifs_dbg(FYI, "about to flush pages\n");
	108	/* should we flush first and last page first */
	109	truncate_inode_pages_range(&target_inode->i_data, destoff,
	110	PAGE_CACHE_ALIGN(destoff + len)-1);
	111
	112	if (target_tcon->ses->server->ops->clone_range)
	113	rc = target_tcon->ses->server->ops->clone_range(xid,
	114	smb_file_src, smb_file_target, off, len, destoff);
	115
	116	/* force revalidate of size and timestamps of target file now
	117	that target is updated on the server */
	118	CIFS_I(target_inode)->time = 0;
	119	out_unlock:
	120	/* although unlocking in the reverse order from locking is not
	121	strictly necessary here it is a little cleaner to be consistent */
378ff1a5	122	unlock_two_nondirectories(src_inode, target_inode);
41c1358e SF	123	out_fput:
	124	fdput(src_file);
	125	out_drop_write:
	126	mnt_drop_write_file(dst_file);
	127	return rc;
	128	}
	129
f9ddcca4	130	long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
1da177e4	131	{
496ad9aa	132	struct inode *inode = file_inode(filep);
1da177e4	133	int rc = -ENOTTY; /* strange error - but the precedent */
6d5786a3	134	unsigned int xid;
c81156dd	135	struct cifs_sb_info *cifs_sb;
ba00ba64	136	struct cifsFileInfo *pSMBFile = filep->private_data;
96daf2b0	137	struct cifs_tcon *tcon;
f654bac2	138	__u64 ExtAttrBits = 0;
61876395	139	__u64 caps;
f654bac2	140
6d5786a3	141	xid = get_xid();
f654bac2	142
f96637be	143	cifs_dbg(FYI, "ioctl file %p cmd %u arg %lu\n", filep, command, arg);
f28ac91b	144
f654bac2	145	cifs_sb = CIFS_SB(inode->i_sb);
f654bac2	146
5fdae1f6	147	switch (command) {
36695673	148	case FS_IOC_GETFLAGS:
61876395 JL	149	if (pSMBFile == NULL)
	150	break;
	151	tcon = tlink_tcon(pSMBFile->tlink);
	152	caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
64a5cfa6	153	#ifdef CONFIG_CIFS_POSIX
5fdae1f6	154	if (CIFS_UNIX_EXTATTR_CAP & caps) {
f10d9ba4	155	__u64 ExtAttrMask = 0;
4b4de76e PS	156	rc = CIFSGetExtAttr(xid, tcon,
	157	pSMBFile->fid.netfid,
	158	&ExtAttrBits, &ExtAttrMask);
5fdae1f6	159	if (rc == 0)
f654bac2	160	rc = put_user(ExtAttrBits &
36695673	161	FS_FL_USER_VISIBLE,
f654bac2	162	(int __user *)arg);
64a5cfa6 SF	163	if (rc != EOPNOTSUPP)
	164	break;
	165	}
	166	#endif /* CONFIG_CIFS_POSIX */
	167	rc = 0;
	168	if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
	169	/* add in the compressed bit */
	170	ExtAttrBits = FS_COMPR_FL;
	171	rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
	172	(int __user *)arg);
f654bac2 SF	173	}
f654bac2 SF	174	break;
36695673	175	case FS_IOC_SETFLAGS:
61876395 JL	176	if (pSMBFile == NULL)
	177	break;
	178	tcon = tlink_tcon(pSMBFile->tlink);
	179	caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
64a5cfa6 SF	180
	181	if (get_user(ExtAttrBits, (int __user *)arg)) {
	182	rc = -EFAULT;
	183	break;
	184	}
	185
	186	/*
	187	* if (CIFS_UNIX_EXTATTR_CAP & caps)
	188	* rc = CIFSSetExtAttr(xid, tcon,
	189	* pSMBFile->fid.netfid,
	190	* extAttrBits,
	191	* &ExtAttrMask);
	192	* if (rc != EOPNOTSUPP)
	193	* break;
	194	*/
	195
	196	/* Currently only flag we can set is compressed flag */
	197	if ((ExtAttrBits & FS_COMPR_FL) == 0)
	198	break;
	199
	200	/* Try to set compress flag */
	201	if (tcon->ses->server->ops->set_compression) {
	202	rc = tcon->ses->server->ops->set_compression(
	203	xid, tcon, pSMBFile);
	204	cifs_dbg(FYI, "set compress flag rc %d\n", rc);
f654bac2	205	}
f654bac2	206	break;
f19e84df	207	case CIFS_IOC_COPYCHUNK_FILE:
41c1358e SF	208	rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0);
41c1358e SF	209	break;
1da177e4	210	default:
f96637be	211	cifs_dbg(FYI, "unsupported ioctl\n");
f28ac91b	212	break;
1da177e4	213	}
f654bac2	214
6d5786a3	215	free_xid(xid);
1da177e4	216	return rc;
5fdae1f6	217	}