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

static int cifs_file_clone_range(unsigned int xid, struct file *src_file,
			  struct file *dst_file)
{
	struct inode *src_inode = file_inode(src_file);
	struct inode *target_inode = file_inode(dst_file);
	struct cifsFileInfo *smb_file_src;
	struct cifsFileInfo *smb_file_target;
	struct cifs_tcon *src_tcon;
	struct cifs_tcon *target_tcon;
	int rc;

	cifs_dbg(FYI, "ioctl clone range\n");

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

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

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

	/*
	 * 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);

	cifs_dbg(FYI, "about to flush pages\n");
	/* should we flush first and last page first */
	truncate_inode_pages(&target_inode->i_data, 0);

	if (target_tcon->ses->server->ops->clone_range)
		rc = target_tcon->ses->server->ops->clone_range(xid,
			smb_file_src, smb_file_target, 0, src_inode->i_size, 0);
	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;
	/* 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:
	return rc;
}

static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
			unsigned long srcfd)
{
	int rc;
	struct fd src_file;
	struct inode *src_inode;

	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;
	}

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

	rc = cifs_file_clone_range(xid, src_file.file, dst_file);

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);
	cifs_dbg(VFS, "cifs ioctl 0x%x\n", command);
	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);
			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;
		case CIFS_ENUMERATE_SNAPSHOTS:
			if (arg == 0) {
				rc = -EINVAL;
				goto cifs_ioc_exit;
			}
			tcon = tlink_tcon(pSMBFile->tlink);
			if (tcon->ses->server->ops->enum_snapshots)
				rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
						pSMBFile, (void __user *)arg);
			else
				rc = -EOPNOTSUPP;
			break;
		default:
			cifs_dbg(FYI, "unsupported ioctl\n");
			break;
	}
cifs_ioc_exit:
	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"
0de1f4c6	34	#include "cifs_ioctl.h"
02b16665	35	#include <linux/btrfs.h>
1da177e4	36
04b38d60 CH	37	static int cifs_file_clone_range(unsigned int xid, struct file *src_file,
04b38d60 CH	38	struct file *dst_file)
41c1358e	39	{
04b38d60	40	struct inode *src_inode = file_inode(src_file);
41c1358e	41	struct inode *target_inode = file_inode(dst_file);
41c1358e	42	struct cifsFileInfo *smb_file_src;
04b38d60	43	struct cifsFileInfo *smb_file_target;
41c1358e	44	struct cifs_tcon *src_tcon;
04b38d60 CH	45	struct cifs_tcon *target_tcon;
04b38d60 CH	46	int rc;
41c1358e SF	47
41c1358e SF	48	cifs_dbg(FYI, "ioctl clone range\n");
41c1358e	49
04b38d60	50	if (!src_file->private_data \|\| !dst_file->private_data) {
41c1358e SF	51	rc = -EBADF;
41c1358e SF	52	cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
04b38d60	53	goto out;
41c1358e SF	54	}
	55
	56	rc = -EXDEV;
	57	smb_file_target = dst_file->private_data;
04b38d60	58	smb_file_src = src_file->private_data;
41c1358e SF	59	src_tcon = tlink_tcon(smb_file_src->tlink);
	60	target_tcon = tlink_tcon(smb_file_target->tlink);
	61
04b38d60	62	if (src_tcon->ses != target_tcon->ses) {
7b52e279	63	cifs_dbg(VFS, "source and target of copy not on same server\n");
04b38d60	64	goto out;
41c1358e SF	65	}
41c1358e SF	66
41c1358e SF	67	/*
	68	* Note: cifs case is easier than btrfs since server responsible for
	69	* checks for proper open modes and file type and if it wants
	70	* server could even support copy of range where source = target
	71	*/
378ff1a5	72	lock_two_nondirectories(target_inode, src_inode);
41c1358e	73
41c1358e SF	74	cifs_dbg(FYI, "about to flush pages\n");
41c1358e SF	75	/* should we flush first and last page first */
04b38d60	76	truncate_inode_pages(&target_inode->i_data, 0);
41c1358e	77
04b38d60	78	if (target_tcon->ses->server->ops->clone_range)
41c1358e	79	rc = target_tcon->ses->server->ops->clone_range(xid,
04b38d60	80	smb_file_src, smb_file_target, 0, src_inode->i_size, 0);
02b16665 SF	81	else
02b16665 SF	82	rc = -EOPNOTSUPP;
41c1358e SF	83
	84	/* force revalidate of size and timestamps of target file now
	85	that target is updated on the server */
	86	CIFS_I(target_inode)->time = 0;
41c1358e SF	87	/* although unlocking in the reverse order from locking is not
41c1358e SF	88	strictly necessary here it is a little cleaner to be consistent */
378ff1a5	89	unlock_two_nondirectories(src_inode, target_inode);
04b38d60 CH	90	out:
	91	return rc;
	92	}
	93
	94	static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
	95	unsigned long srcfd)
	96	{
	97	int rc;
	98	struct fd src_file;
	99	struct inode *src_inode;
	100
	101	cifs_dbg(FYI, "ioctl clone range\n");
	102	/* the destination must be opened for writing */
	103	if (!(dst_file->f_mode & FMODE_WRITE)) {
	104	cifs_dbg(FYI, "file target not open for write\n");
	105	return -EINVAL;
	106	}
	107
	108	/* check if target volume is readonly and take reference */
	109	rc = mnt_want_write_file(dst_file);
	110	if (rc) {
	111	cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
	112	return rc;
	113	}
	114
	115	src_file = fdget(srcfd);
	116	if (!src_file.file) {
	117	rc = -EBADF;
	118	goto out_drop_write;
	119	}
	120
	121	if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) {
	122	rc = -EBADF;
	123	cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
	124	goto out_fput;
	125	}
	126
	127	src_inode = file_inode(src_file.file);
	128	rc = -EINVAL;
	129	if (S_ISDIR(src_inode->i_mode))
	130	goto out_fput;
	131
	132	rc = cifs_file_clone_range(xid, src_file.file, dst_file);
	133
41c1358e SF	134	out_fput:
	135	fdput(src_file);
	136	out_drop_write:
	137	mnt_drop_write_file(dst_file);
	138	return rc;
	139	}
	140
0de1f4c6 SF	141	static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
	142	void __user *arg)
	143	{
	144	int rc = 0;
	145	struct smb_mnt_fs_info *fsinf;
	146
	147	fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
	148	if (fsinf == NULL)
	149	return -ENOMEM;
	150
	151	fsinf->version = 1;
	152	fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
	153	fsinf->device_characteristics =
	154	le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
	155	fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
	156	fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
	157	fsinf->max_path_component =
	158	le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
	159	#ifdef CONFIG_CIFS_SMB2
	160	fsinf->vol_serial_number = tcon->vol_serial_number;
	161	fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
	162	fsinf->share_flags = tcon->share_flags;
	163	fsinf->share_caps = le32_to_cpu(tcon->capabilities);
	164	fsinf->sector_flags = tcon->ss_flags;
	165	fsinf->optimal_sector_size = tcon->perf_sector_size;
	166	fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
	167	fsinf->maximal_access = tcon->maximal_access;
	168	#endif /* SMB2 */
	169	fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
	170
	171	if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
	172	rc = -EFAULT;
	173
	174	kfree(fsinf);
	175	return rc;
	176	}
	177
f9ddcca4	178	long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
1da177e4	179	{
496ad9aa	180	struct inode *inode = file_inode(filep);
1da177e4	181	int rc = -ENOTTY; /* strange error - but the precedent */
6d5786a3	182	unsigned int xid;
c81156dd	183	struct cifs_sb_info *cifs_sb;
ba00ba64	184	struct cifsFileInfo *pSMBFile = filep->private_data;
96daf2b0	185	struct cifs_tcon *tcon;
f654bac2	186	__u64 ExtAttrBits = 0;
61876395	187	__u64 caps;
f654bac2	188
6d5786a3	189	xid = get_xid();
f654bac2 SF	190
f654bac2 SF	191	cifs_sb = CIFS_SB(inode->i_sb);
834170c8	192	cifs_dbg(VFS, "cifs ioctl 0x%x\n", command);
5fdae1f6	193	switch (command) {
36695673	194	case FS_IOC_GETFLAGS:
61876395 JL	195	if (pSMBFile == NULL)
	196	break;
	197	tcon = tlink_tcon(pSMBFile->tlink);
	198	caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
64a5cfa6	199	#ifdef CONFIG_CIFS_POSIX
5fdae1f6	200	if (CIFS_UNIX_EXTATTR_CAP & caps) {
f10d9ba4	201	__u64 ExtAttrMask = 0;
4b4de76e PS	202	rc = CIFSGetExtAttr(xid, tcon,
	203	pSMBFile->fid.netfid,
	204	&ExtAttrBits, &ExtAttrMask);
5fdae1f6	205	if (rc == 0)
f654bac2	206	rc = put_user(ExtAttrBits &
36695673	207	FS_FL_USER_VISIBLE,
f654bac2	208	(int __user *)arg);
64a5cfa6 SF	209	if (rc != EOPNOTSUPP)
	210	break;
	211	}
	212	#endif /* CONFIG_CIFS_POSIX */
	213	rc = 0;
	214	if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
	215	/* add in the compressed bit */
	216	ExtAttrBits = FS_COMPR_FL;
	217	rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
	218	(int __user *)arg);
f654bac2 SF	219	}
f654bac2 SF	220	break;
36695673	221	case FS_IOC_SETFLAGS:
61876395 JL	222	if (pSMBFile == NULL)
	223	break;
	224	tcon = tlink_tcon(pSMBFile->tlink);
	225	caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
64a5cfa6 SF	226
	227	if (get_user(ExtAttrBits, (int __user *)arg)) {
	228	rc = -EFAULT;
	229	break;
	230	}
	231
	232	/*
	233	* if (CIFS_UNIX_EXTATTR_CAP & caps)
	234	* rc = CIFSSetExtAttr(xid, tcon,
	235	* pSMBFile->fid.netfid,
	236	* extAttrBits,
	237	* &ExtAttrMask);
	238	* if (rc != EOPNOTSUPP)
	239	* break;
	240	*/
	241
	242	/* Currently only flag we can set is compressed flag */
	243	if ((ExtAttrBits & FS_COMPR_FL) == 0)
	244	break;
	245
	246	/* Try to set compress flag */
	247	if (tcon->ses->server->ops->set_compression) {
	248	rc = tcon->ses->server->ops->set_compression(
	249	xid, tcon, pSMBFile);
	250	cifs_dbg(FYI, "set compress flag rc %d\n", rc);
f654bac2	251	}
f654bac2	252	break;
f19e84df	253	case CIFS_IOC_COPYCHUNK_FILE:
04b38d60	254	rc = cifs_ioctl_clone(xid, filep, arg);
41c1358e	255	break;
b3152e2c SF	256	case CIFS_IOC_SET_INTEGRITY:
	257	if (pSMBFile == NULL)
	258	break;
	259	tcon = tlink_tcon(pSMBFile->tlink);
	260	if (tcon->ses->server->ops->set_integrity)
	261	rc = tcon->ses->server->ops->set_integrity(xid,
	262	tcon, pSMBFile);
	263	else
	264	rc = -EOPNOTSUPP;
	265	break;
0de1f4c6 SF	266	case CIFS_IOC_GET_MNT_INFO:
	267	tcon = tlink_tcon(pSMBFile->tlink);
	268	rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
	269	break;
834170c8 SF	270	case CIFS_ENUMERATE_SNAPSHOTS:
	271	if (arg == 0) {
	272	rc = -EINVAL;
	273	goto cifs_ioc_exit;
	274	}
	275	tcon = tlink_tcon(pSMBFile->tlink);
	276	if (tcon->ses->server->ops->enum_snapshots)
	277	rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
	278	pSMBFile, (void __user *)arg);
	279	else
	280	rc = -EOPNOTSUPP;
	281	break;
1da177e4	282	default:
f96637be	283	cifs_dbg(FYI, "unsupported ioctl\n");
f28ac91b	284	break;
1da177e4	285	}
834170c8	286	cifs_ioc_exit:
6d5786a3	287	free_xid(xid);
1da177e4	288	return rc;
5fdae1f6	289	}