[deliverable/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 (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->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;
	}

	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 source and target on same server (or volume if dup_extents) */
	if (dup_extents && (src_tcon != target_tcon)) {
		cifs_dbg(VFS, "source and target of copy not on same share\n");
		goto out_fput;
	}

	if (!dup_extents && (src_tcon->ses != target_tcon->ses)) {
		cifs_dbg(VFS, "source and target of copy not on same server\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
4c17a6d5 JH	70	if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) {
	71	rc = -EBADF;
	72	cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
	73	goto out_fput;
	74	}
	75
41c1358e SF	76	if ((!src_file.file->private_data) \|\| (!dst_file->private_data)) {
	77	rc = -EBADF;
	78	cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
	79	goto out_fput;
	80	}
	81
	82	rc = -EXDEV;
	83	smb_file_target = dst_file->private_data;
	84	smb_file_src = src_file.file->private_data;
	85	src_tcon = tlink_tcon(smb_file_src->tlink);
	86	target_tcon = tlink_tcon(smb_file_target->tlink);
	87
7b52e279 SF	88	/* check source and target on same server (or volume if dup_extents) */
	89	if (dup_extents && (src_tcon != target_tcon)) {
	90	cifs_dbg(VFS, "source and target of copy not on same share\n");
	91	goto out_fput;
	92	}
	93
	94	if (!dup_extents && (src_tcon->ses != target_tcon->ses)) {
	95	cifs_dbg(VFS, "source and target of copy not on same server\n");
41c1358e SF	96	goto out_fput;
	97	}
	98
2d4f84bd	99	src_inode = file_inode(src_file.file);
378ff1a5 AV	100	rc = -EINVAL;
	101	if (S_ISDIR(src_inode->i_mode))
	102	goto out_fput;
41c1358e SF	103
	104	/*
	105	* Note: cifs case is easier than btrfs since server responsible for
	106	* checks for proper open modes and file type and if it wants
	107	* server could even support copy of range where source = target
	108	*/
378ff1a5	109	lock_two_nondirectories(target_inode, src_inode);
41c1358e SF	110
	111	/* determine range to clone */
	112	rc = -EINVAL;
	113	if (off + len > src_inode->i_size \|\| off + len < off)
	114	goto out_unlock;
	115	if (len == 0)
	116	len = src_inode->i_size - off;
	117
	118	cifs_dbg(FYI, "about to flush pages\n");
	119	/* should we flush first and last page first */
	120	truncate_inode_pages_range(&target_inode->i_data, destoff,
	121	PAGE_CACHE_ALIGN(destoff + len)-1);
	122
02b16665 SF	123	if (dup_extents && target_tcon->ses->server->ops->duplicate_extents)
	124	rc = target_tcon->ses->server->ops->duplicate_extents(xid,
	125	smb_file_src, smb_file_target, off, len, destoff);
	126	else if (!dup_extents && target_tcon->ses->server->ops->clone_range)
41c1358e SF	127	rc = target_tcon->ses->server->ops->clone_range(xid,
41c1358e SF	128	smb_file_src, smb_file_target, off, len, destoff);
02b16665 SF	129	else
02b16665 SF	130	rc = -EOPNOTSUPP;
41c1358e SF	131
	132	/* force revalidate of size and timestamps of target file now
	133	that target is updated on the server */
	134	CIFS_I(target_inode)->time = 0;
	135	out_unlock:
	136	/* although unlocking in the reverse order from locking is not
	137	strictly necessary here it is a little cleaner to be consistent */
378ff1a5	138	unlock_two_nondirectories(src_inode, target_inode);
41c1358e SF	139	out_fput:
	140	fdput(src_file);
	141	out_drop_write:
	142	mnt_drop_write_file(dst_file);
	143	return rc;
	144	}
	145
0de1f4c6 SF	146	static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
	147	void __user *arg)
	148	{
	149	int rc = 0;
	150	struct smb_mnt_fs_info *fsinf;
	151
	152	fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
	153	if (fsinf == NULL)
	154	return -ENOMEM;
	155
	156	fsinf->version = 1;
	157	fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
	158	fsinf->device_characteristics =
	159	le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
	160	fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
	161	fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
	162	fsinf->max_path_component =
	163	le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
	164	#ifdef CONFIG_CIFS_SMB2
	165	fsinf->vol_serial_number = tcon->vol_serial_number;
	166	fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
	167	fsinf->share_flags = tcon->share_flags;
	168	fsinf->share_caps = le32_to_cpu(tcon->capabilities);
	169	fsinf->sector_flags = tcon->ss_flags;
	170	fsinf->optimal_sector_size = tcon->perf_sector_size;
	171	fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
	172	fsinf->maximal_access = tcon->maximal_access;
	173	#endif /* SMB2 */
	174	fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
	175
	176	if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
	177	rc = -EFAULT;
	178
	179	kfree(fsinf);
	180	return rc;
	181	}
	182
f9ddcca4	183	long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
1da177e4	184	{
496ad9aa	185	struct inode *inode = file_inode(filep);
1da177e4	186	int rc = -ENOTTY; /* strange error - but the precedent */
6d5786a3	187	unsigned int xid;
c81156dd	188	struct cifs_sb_info *cifs_sb;
ba00ba64	189	struct cifsFileInfo *pSMBFile = filep->private_data;
96daf2b0	190	struct cifs_tcon *tcon;
f654bac2	191	__u64 ExtAttrBits = 0;
61876395	192	__u64 caps;
f654bac2	193
6d5786a3	194	xid = get_xid();
f654bac2 SF	195
f654bac2 SF	196	cifs_sb = CIFS_SB(inode->i_sb);
f654bac2	197
5fdae1f6	198	switch (command) {
36695673	199	case FS_IOC_GETFLAGS:
61876395 JL	200	if (pSMBFile == NULL)
	201	break;
	202	tcon = tlink_tcon(pSMBFile->tlink);
	203	caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
64a5cfa6	204	#ifdef CONFIG_CIFS_POSIX
5fdae1f6	205	if (CIFS_UNIX_EXTATTR_CAP & caps) {
f10d9ba4	206	__u64 ExtAttrMask = 0;
4b4de76e PS	207	rc = CIFSGetExtAttr(xid, tcon,
	208	pSMBFile->fid.netfid,
	209	&ExtAttrBits, &ExtAttrMask);
5fdae1f6	210	if (rc == 0)
f654bac2	211	rc = put_user(ExtAttrBits &
36695673	212	FS_FL_USER_VISIBLE,
f654bac2	213	(int __user *)arg);
64a5cfa6 SF	214	if (rc != EOPNOTSUPP)
	215	break;
	216	}
	217	#endif /* CONFIG_CIFS_POSIX */
	218	rc = 0;
	219	if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
	220	/* add in the compressed bit */
	221	ExtAttrBits = FS_COMPR_FL;
	222	rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
	223	(int __user *)arg);
f654bac2 SF	224	}
f654bac2 SF	225	break;
36695673	226	case FS_IOC_SETFLAGS:
61876395 JL	227	if (pSMBFile == NULL)
	228	break;
	229	tcon = tlink_tcon(pSMBFile->tlink);
	230	caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
64a5cfa6 SF	231
	232	if (get_user(ExtAttrBits, (int __user *)arg)) {
	233	rc = -EFAULT;
	234	break;
	235	}
	236
	237	/*
	238	* if (CIFS_UNIX_EXTATTR_CAP & caps)
	239	* rc = CIFSSetExtAttr(xid, tcon,
	240	* pSMBFile->fid.netfid,
	241	* extAttrBits,
	242	* &ExtAttrMask);
	243	* if (rc != EOPNOTSUPP)
	244	* break;
	245	*/
	246
	247	/* Currently only flag we can set is compressed flag */
	248	if ((ExtAttrBits & FS_COMPR_FL) == 0)
	249	break;
	250
	251	/* Try to set compress flag */
	252	if (tcon->ses->server->ops->set_compression) {
	253	rc = tcon->ses->server->ops->set_compression(
	254	xid, tcon, pSMBFile);
	255	cifs_dbg(FYI, "set compress flag rc %d\n", rc);
f654bac2	256	}
f654bac2	257	break;
f19e84df	258	case CIFS_IOC_COPYCHUNK_FILE:
02b16665 SF	259	rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, false);
	260	break;
	261	case BTRFS_IOC_CLONE:
	262	rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, true);
41c1358e	263	break;
b3152e2c SF	264	case CIFS_IOC_SET_INTEGRITY:
	265	if (pSMBFile == NULL)
	266	break;
	267	tcon = tlink_tcon(pSMBFile->tlink);
	268	if (tcon->ses->server->ops->set_integrity)
	269	rc = tcon->ses->server->ops->set_integrity(xid,
	270	tcon, pSMBFile);
	271	else
	272	rc = -EOPNOTSUPP;
	273	break;
0de1f4c6 SF	274	case CIFS_IOC_GET_MNT_INFO:
	275	tcon = tlink_tcon(pSMBFile->tlink);
	276	rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
	277	break;
1da177e4	278	default:
f96637be	279	cifs_dbg(FYI, "unsupported ioctl\n");
f28ac91b	280	break;
1da177e4	281	}
f654bac2	282
6d5786a3	283	free_xid(xid);
1da177e4	284	return rc;
5fdae1f6	285	}