[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 "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->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;
}

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;
}
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
41c1358e	37	static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
02b16665 SF	38	unsigned long srcfd, u64 off, u64 len, u64 destoff,
02b16665 SF	39	bool dup_extents)
41c1358e SF	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
02b16665 SF	112	if (dup_extents && target_tcon->ses->server->ops->duplicate_extents)
	113	rc = target_tcon->ses->server->ops->duplicate_extents(xid,
	114	smb_file_src, smb_file_target, off, len, destoff);
	115	else if (!dup_extents && target_tcon->ses->server->ops->clone_range)
41c1358e SF	116	rc = target_tcon->ses->server->ops->clone_range(xid,
41c1358e SF	117	smb_file_src, smb_file_target, off, len, destoff);
02b16665 SF	118	else
02b16665 SF	119	rc = -EOPNOTSUPP;
41c1358e SF	120
	121	/* force revalidate of size and timestamps of target file now
	122	that target is updated on the server */
	123	CIFS_I(target_inode)->time = 0;
	124	out_unlock:
	125	/* although unlocking in the reverse order from locking is not
	126	strictly necessary here it is a little cleaner to be consistent */
378ff1a5	127	unlock_two_nondirectories(src_inode, target_inode);
41c1358e SF	128	out_fput:
	129	fdput(src_file);
	130	out_drop_write:
	131	mnt_drop_write_file(dst_file);
	132	return rc;
	133	}
	134
0de1f4c6 SF	135	static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
	136	void __user *arg)
	137	{
	138	int rc = 0;
	139	struct smb_mnt_fs_info *fsinf;
	140
	141	fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
	142	if (fsinf == NULL)
	143	return -ENOMEM;
	144
	145	fsinf->version = 1;
	146	fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
	147	fsinf->device_characteristics =
	148	le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
	149	fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
	150	fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
	151	fsinf->max_path_component =
	152	le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
	153	#ifdef CONFIG_CIFS_SMB2
	154	fsinf->vol_serial_number = tcon->vol_serial_number;
	155	fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
	156	fsinf->share_flags = tcon->share_flags;
	157	fsinf->share_caps = le32_to_cpu(tcon->capabilities);
	158	fsinf->sector_flags = tcon->ss_flags;
	159	fsinf->optimal_sector_size = tcon->perf_sector_size;
	160	fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
	161	fsinf->maximal_access = tcon->maximal_access;
	162	#endif /* SMB2 */
	163	fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
	164
	165	if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
	166	rc = -EFAULT;
	167
	168	kfree(fsinf);
	169	return rc;
	170	}
	171
f9ddcca4	172	long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
1da177e4	173	{
496ad9aa	174	struct inode *inode = file_inode(filep);
1da177e4	175	int rc = -ENOTTY; /* strange error - but the precedent */
6d5786a3	176	unsigned int xid;
c81156dd	177	struct cifs_sb_info *cifs_sb;
ba00ba64	178	struct cifsFileInfo *pSMBFile = filep->private_data;
96daf2b0	179	struct cifs_tcon *tcon;
f654bac2	180	__u64 ExtAttrBits = 0;
61876395	181	__u64 caps;
f654bac2	182
6d5786a3	183	xid = get_xid();
f654bac2 SF	184
f654bac2 SF	185	cifs_sb = CIFS_SB(inode->i_sb);
f654bac2	186
5fdae1f6	187	switch (command) {
36695673	188	case FS_IOC_GETFLAGS:
61876395 JL	189	if (pSMBFile == NULL)
	190	break;
	191	tcon = tlink_tcon(pSMBFile->tlink);
	192	caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
64a5cfa6	193	#ifdef CONFIG_CIFS_POSIX
5fdae1f6	194	if (CIFS_UNIX_EXTATTR_CAP & caps) {
f10d9ba4	195	__u64 ExtAttrMask = 0;
4b4de76e PS	196	rc = CIFSGetExtAttr(xid, tcon,
	197	pSMBFile->fid.netfid,
	198	&ExtAttrBits, &ExtAttrMask);
5fdae1f6	199	if (rc == 0)
f654bac2	200	rc = put_user(ExtAttrBits &
36695673	201	FS_FL_USER_VISIBLE,
f654bac2	202	(int __user *)arg);
64a5cfa6 SF	203	if (rc != EOPNOTSUPP)
	204	break;
	205	}
	206	#endif /* CONFIG_CIFS_POSIX */
	207	rc = 0;
	208	if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
	209	/* add in the compressed bit */
	210	ExtAttrBits = FS_COMPR_FL;
	211	rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
	212	(int __user *)arg);
f654bac2 SF	213	}
f654bac2 SF	214	break;
36695673	215	case FS_IOC_SETFLAGS:
61876395 JL	216	if (pSMBFile == NULL)
	217	break;
	218	tcon = tlink_tcon(pSMBFile->tlink);
	219	caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
64a5cfa6 SF	220
	221	if (get_user(ExtAttrBits, (int __user *)arg)) {
	222	rc = -EFAULT;
	223	break;
	224	}
	225
	226	/*
	227	* if (CIFS_UNIX_EXTATTR_CAP & caps)
	228	* rc = CIFSSetExtAttr(xid, tcon,
	229	* pSMBFile->fid.netfid,
	230	* extAttrBits,
	231	* &ExtAttrMask);
	232	* if (rc != EOPNOTSUPP)
	233	* break;
	234	*/
	235
	236	/* Currently only flag we can set is compressed flag */
	237	if ((ExtAttrBits & FS_COMPR_FL) == 0)
	238	break;
	239
	240	/* Try to set compress flag */
	241	if (tcon->ses->server->ops->set_compression) {
	242	rc = tcon->ses->server->ops->set_compression(
	243	xid, tcon, pSMBFile);
	244	cifs_dbg(FYI, "set compress flag rc %d\n", rc);
f654bac2	245	}
f654bac2	246	break;
f19e84df	247	case CIFS_IOC_COPYCHUNK_FILE:
02b16665 SF	248	rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, false);
	249	break;
	250	case BTRFS_IOC_CLONE:
	251	rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, true);
41c1358e	252	break;
b3152e2c SF	253	case CIFS_IOC_SET_INTEGRITY:
	254	if (pSMBFile == NULL)
	255	break;
	256	tcon = tlink_tcon(pSMBFile->tlink);
	257	if (tcon->ses->server->ops->set_integrity)
	258	rc = tcon->ses->server->ops->set_integrity(xid,
	259	tcon, pSMBFile);
	260	else
	261	rc = -EOPNOTSUPP;
	262	break;
0de1f4c6 SF	263	case CIFS_IOC_GET_MNT_INFO:
	264	tcon = tlink_tcon(pSMBFile->tlink);
	265	rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
	266	break;
1da177e4	267	default:
f96637be	268	cifs_dbg(FYI, "unsupported ioctl\n");
f28ac91b	269	break;
1da177e4	270	}
f654bac2	271
6d5786a3	272	free_xid(xid);
1da177e4	273	return rc;
5fdae1f6	274	}