[mirror_ubuntu-zesty-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 <linux/btrfs.h>
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifsfs.h"

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 = src_file.file->f_dentry->d_inode;

	/*
	 * 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
	 */

	/* so we do not deadlock racing two ioctls on same files */
	if (target_inode < src_inode) {
		mutex_lock_nested(&target_inode->i_mutex, I_MUTEX_PARENT);
		mutex_lock_nested(&src_inode->i_mutex, I_MUTEX_CHILD);
	} else {
		mutex_lock_nested(&src_inode->i_mutex, I_MUTEX_PARENT);
		mutex_lock_nested(&target_inode->i_mutex, I_MUTEX_CHILD);
	}

	/* 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 */
	if (target_inode < src_inode) {
		mutex_unlock(&src_inode->i_mutex);
		mutex_unlock(&target_inode->i_mutex);
	} else {
		mutex_unlock(&target_inode->i_mutex);
		mutex_unlock(&src_inode->i_mutex);
	}
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 BTRFS_IOC_CLONE:
			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 (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>
	29	#include <linux/btrfs.h>
1da177e4 LT	30	#include "cifspdu.h"
	31	#include "cifsglob.h"
	32	#include "cifsproto.h"
	33	#include "cifs_debug.h"
c67593a0	34	#include "cifsfs.h"
1da177e4	35
41c1358e SF	36	static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
	37	unsigned long srcfd, u64 off, u64 len, u64 destoff)
	38	{
	39	int rc;
	40	struct cifsFileInfo *smb_file_target = dst_file->private_data;
	41	struct inode *target_inode = file_inode(dst_file);
	42	struct cifs_tcon *target_tcon;
	43	struct fd src_file;
	44	struct cifsFileInfo *smb_file_src;
	45	struct inode *src_inode;
	46	struct cifs_tcon *src_tcon;
	47
	48	cifs_dbg(FYI, "ioctl clone range\n");
	49	/* the destination must be opened for writing */
	50	if (!(dst_file->f_mode & FMODE_WRITE)) {
	51	cifs_dbg(FYI, "file target not open for write\n");
	52	return -EINVAL;
	53	}
	54
	55	/* check if target volume is readonly and take reference */
	56	rc = mnt_want_write_file(dst_file);
	57	if (rc) {
	58	cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
	59	return rc;
	60	}
	61
	62	src_file = fdget(srcfd);
	63	if (!src_file.file) {
	64	rc = -EBADF;
	65	goto out_drop_write;
	66	}
	67
	68	if ((!src_file.file->private_data) \|\| (!dst_file->private_data)) {
	69	rc = -EBADF;
	70	cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
	71	goto out_fput;
	72	}
	73
	74	rc = -EXDEV;
	75	smb_file_target = dst_file->private_data;
	76	smb_file_src = src_file.file->private_data;
	77	src_tcon = tlink_tcon(smb_file_src->tlink);
	78	target_tcon = tlink_tcon(smb_file_target->tlink);
	79
	80	/* check if source and target are on same tree connection */
	81	if (src_tcon != target_tcon) {
	82	cifs_dbg(VFS, "file copy src and target on different volume\n");
	83	goto out_fput;
	84	}
	85
	86	src_inode = src_file.file->f_dentry->d_inode;
	87
	88	/*
	89	* Note: cifs case is easier than btrfs since server responsible for
	90	* checks for proper open modes and file type and if it wants
	91	* server could even support copy of range where source = target
	92	*/
	93
	94	/* so we do not deadlock racing two ioctls on same files */
	95	if (target_inode < src_inode) {
	96	mutex_lock_nested(&target_inode->i_mutex, I_MUTEX_PARENT);
	97	mutex_lock_nested(&src_inode->i_mutex, I_MUTEX_CHILD);
	98	} else {
	99	mutex_lock_nested(&src_inode->i_mutex, I_MUTEX_PARENT);
100	mutex_lock_nested(&target_inode->i_mutex, I_MUTEX_CHILD);
101	}
102
103	/* determine range to clone */
104	rc = -EINVAL;
105	if (off + len > src_inode->i_size \|\| off + len < off)
106	goto out_unlock;
107	if (len == 0)
108	len = src_inode->i_size - off;
109
110	cifs_dbg(FYI, "about to flush pages\n");
111	/* should we flush first and last page first */
112	truncate_inode_pages_range(&target_inode->i_data, destoff,
113	PAGE_CACHE_ALIGN(destoff + len)-1);
114
115	if (target_tcon->ses->server->ops->clone_range)
116	rc = target_tcon->ses->server->ops->clone_range(xid,
117	smb_file_src, smb_file_target, off, len, destoff);
118
119	/* force revalidate of size and timestamps of target file now
120	that target is updated on the server */
121	CIFS_I(target_inode)->time = 0;
122	out_unlock:
123	/* although unlocking in the reverse order from locking is not
124	strictly necessary here it is a little cleaner to be consistent */
125	if (target_inode < src_inode) {
126	mutex_unlock(&src_inode->i_mutex);
127	mutex_unlock(&target_inode->i_mutex);
128	} else {
129	mutex_unlock(&target_inode->i_mutex);
130	mutex_unlock(&src_inode->i_mutex);
131	}
132	out_fput:
133	fdput(src_file);
134	out_drop_write:
135	mnt_drop_write_file(dst_file);
136	return rc;
137	}
138
f9ddcca4	139	long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
1da177e4	140	{
496ad9aa	141	struct inode *inode = file_inode(filep);
1da177e4	142	int rc = -ENOTTY; /* strange error - but the precedent */
6d5786a3	143	unsigned int xid;
c81156dd	144	struct cifs_sb_info *cifs_sb;
ba00ba64	145	struct cifsFileInfo *pSMBFile = filep->private_data;
96daf2b0	146	struct cifs_tcon *tcon;
f654bac2	147	__u64 ExtAttrBits = 0;
61876395	148	__u64 caps;
f654bac2	149
6d5786a3	150	xid = get_xid();
f654bac2	151
f96637be	152	cifs_dbg(FYI, "ioctl file %p cmd %u arg %lu\n", filep, command, arg);
f28ac91b	153
f654bac2	154	cifs_sb = CIFS_SB(inode->i_sb);
f654bac2	155
5fdae1f6	156	switch (command) {
36695673	157	case FS_IOC_GETFLAGS:
61876395 JL	158	if (pSMBFile == NULL)
	159	break;
	160	tcon = tlink_tcon(pSMBFile->tlink);
	161	caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
64a5cfa6	162	#ifdef CONFIG_CIFS_POSIX
5fdae1f6	163	if (CIFS_UNIX_EXTATTR_CAP & caps) {
f10d9ba4	164	__u64 ExtAttrMask = 0;
4b4de76e PS	165	rc = CIFSGetExtAttr(xid, tcon,
	166	pSMBFile->fid.netfid,
	167	&ExtAttrBits, &ExtAttrMask);
5fdae1f6	168	if (rc == 0)
f654bac2	169	rc = put_user(ExtAttrBits &
36695673	170	FS_FL_USER_VISIBLE,
f654bac2	171	(int __user *)arg);
64a5cfa6 SF	172	if (rc != EOPNOTSUPP)
	173	break;
	174	}
	175	#endif /* CONFIG_CIFS_POSIX */
	176	rc = 0;
	177	if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
	178	/* add in the compressed bit */
	179	ExtAttrBits = FS_COMPR_FL;
	180	rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
	181	(int __user *)arg);
f654bac2 SF	182	}
f654bac2 SF	183	break;
36695673	184	case FS_IOC_SETFLAGS:
61876395 JL	185	if (pSMBFile == NULL)
	186	break;
	187	tcon = tlink_tcon(pSMBFile->tlink);
	188	caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
64a5cfa6 SF	189
	190	if (get_user(ExtAttrBits, (int __user *)arg)) {
	191	rc = -EFAULT;
	192	break;
	193	}
	194
	195	/*
	196	* if (CIFS_UNIX_EXTATTR_CAP & caps)
	197	* rc = CIFSSetExtAttr(xid, tcon,
	198	* pSMBFile->fid.netfid,
	199	* extAttrBits,
	200	* &ExtAttrMask);
	201	* if (rc != EOPNOTSUPP)
	202	* break;
	203	*/
	204
	205	/* Currently only flag we can set is compressed flag */
	206	if ((ExtAttrBits & FS_COMPR_FL) == 0)
	207	break;
	208
	209	/* Try to set compress flag */
	210	if (tcon->ses->server->ops->set_compression) {
	211	rc = tcon->ses->server->ops->set_compression(
	212	xid, tcon, pSMBFile);
	213	cifs_dbg(FYI, "set compress flag rc %d\n", rc);
f654bac2	214	}
f654bac2	215	break;
41c1358e SF	216	case BTRFS_IOC_CLONE:
	217	rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0);
	218	break;
1da177e4	219	default:
f96637be	220	cifs_dbg(FYI, "unsupported ioctl\n");
f28ac91b	221	break;
1da177e4	222	}
f654bac2	223
6d5786a3	224	free_xid(xid);
1da177e4	225	return rc;
5fdae1f6	226	}