1/*
  2 *   fs/cifs/ioctl.c
  3 *
  4 *   vfs operations that deal with io control
  5 *
  6 *   Copyright (C) International Business Machines  Corp., 2005,2013
  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 */
 23
 24#include <linux/fs.h>
 25#include <linux/file.h>
 26#include <linux/mount.h>
 27#include <linux/mm.h>
 28#include <linux/pagemap.h>
 29#include "cifspdu.h"
 30#include "cifsglob.h"
 31#include "cifsproto.h"
 32#include "cifs_debug.h"
 33#include "cifsfs.h"
 34#include "cifs_ioctl.h"
 35#include <linux/btrfs.h>
 36
 37static long cifs_ioctl_copychunk(unsigned int xid, struct file *dst_file,
 38			unsigned long srcfd)
 39{
 40	int rc;
 41	struct fd src_file;
 42	struct inode *src_inode;
 43
 44	cifs_dbg(FYI, "ioctl copychunk range\n");
 45	/* the destination must be opened for writing */
 46	if (!(dst_file->f_mode & FMODE_WRITE)) {
 47		cifs_dbg(FYI, "file target not open for write\n");
 48		return -EINVAL;
 49	}
 50
 51	/* check if target volume is readonly and take reference */
 52	rc = mnt_want_write_file(dst_file);
 53	if (rc) {
 54		cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
 55		return rc;
 56	}
 57
 58	src_file = fdget(srcfd);
 59	if (!src_file.file) {
 60		rc = -EBADF;
 61		goto out_drop_write;
 62	}
 63
 64	if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) {
 65		rc = -EBADF;
 66		cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
 67		goto out_fput;
 68	}
 69
 70	src_inode = file_inode(src_file.file);
 71	rc = -EINVAL;
 72	if (S_ISDIR(src_inode->i_mode))
 73		goto out_fput;
 74
 75	rc = cifs_file_copychunk_range(xid, src_file.file, 0, dst_file, 0,
 76					src_inode->i_size, 0);
 77	if (rc > 0)
 78		rc = 0;
 79out_fput:
 80	fdput(src_file);
 81out_drop_write:
 82	mnt_drop_write_file(dst_file);
 83	return rc;
 84}
 85
 86static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
 87				void __user *arg)
 88{
 89	int rc = 0;
 90	struct smb_mnt_fs_info *fsinf;
 91
 92	fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
 93	if (fsinf == NULL)
 94		return -ENOMEM;
 95
 96	fsinf->version = 1;
 97	fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
 98	fsinf->device_characteristics =
 99			le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
100	fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
101	fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
102	fsinf->max_path_component =
103		le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
104	fsinf->vol_serial_number = tcon->vol_serial_number;
105	fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
106	fsinf->share_flags = tcon->share_flags;
107	fsinf->share_caps = le32_to_cpu(tcon->capabilities);
108	fsinf->sector_flags = tcon->ss_flags;
109	fsinf->optimal_sector_size = tcon->perf_sector_size;
110	fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
111	fsinf->maximal_access = tcon->maximal_access;
112	fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
113
114	if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
115		rc = -EFAULT;
116
117	kfree(fsinf);
118	return rc;
119}
120
121long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
122{
123	struct inode *inode = file_inode(filep);
124	int rc = -ENOTTY; /* strange error - but the precedent */
125	unsigned int xid;
126	struct cifs_sb_info *cifs_sb;
127	struct cifsFileInfo *pSMBFile = filep->private_data;
128	struct cifs_tcon *tcon;
129	__u64	ExtAttrBits = 0;
130	__u64   caps;
131
132	xid = get_xid();
133
134	cifs_sb = CIFS_SB(inode->i_sb);
135	cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
136	switch (command) {
137		case FS_IOC_GETFLAGS:
138			if (pSMBFile == NULL)
139				break;
140			tcon = tlink_tcon(pSMBFile->tlink);
141			caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
142#ifdef CONFIG_CIFS_POSIX
143			if (CIFS_UNIX_EXTATTR_CAP & caps) {
144				__u64	ExtAttrMask = 0;
145				rc = CIFSGetExtAttr(xid, tcon,
146						    pSMBFile->fid.netfid,
147						    &ExtAttrBits, &ExtAttrMask);
148				if (rc == 0)
149					rc = put_user(ExtAttrBits &
150						FS_FL_USER_VISIBLE,
151						(int __user *)arg);
152				if (rc != EOPNOTSUPP)
153					break;
154			}
155#endif /* CONFIG_CIFS_POSIX */
156			rc = 0;
157			if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
158				/* add in the compressed bit */
159				ExtAttrBits = FS_COMPR_FL;
160				rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
161					      (int __user *)arg);
162			}
163			break;
164		case FS_IOC_SETFLAGS:
165			if (pSMBFile == NULL)
166				break;
167			tcon = tlink_tcon(pSMBFile->tlink);
168			caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
169
170			if (get_user(ExtAttrBits, (int __user *)arg)) {
171				rc = -EFAULT;
172				break;
173			}
174
175			/*
176			 * if (CIFS_UNIX_EXTATTR_CAP & caps)
177			 *	rc = CIFSSetExtAttr(xid, tcon,
178			 *		       pSMBFile->fid.netfid,
179			 *		       extAttrBits,
180			 *		       &ExtAttrMask);
181			 * if (rc != EOPNOTSUPP)
182			 *	break;
183			 */
184
185			/* Currently only flag we can set is compressed flag */
186			if ((ExtAttrBits & FS_COMPR_FL) == 0)
187				break;
188
189			/* Try to set compress flag */
190			if (tcon->ses->server->ops->set_compression) {
191				rc = tcon->ses->server->ops->set_compression(
192							xid, tcon, pSMBFile);
193				cifs_dbg(FYI, "set compress flag rc %d\n", rc);
194			}
195			break;
196		case CIFS_IOC_COPYCHUNK_FILE:
197			rc = cifs_ioctl_copychunk(xid, filep, arg);
198			break;
199		case CIFS_IOC_SET_INTEGRITY:
200			if (pSMBFile == NULL)
201				break;
202			tcon = tlink_tcon(pSMBFile->tlink);
203			if (tcon->ses->server->ops->set_integrity)
204				rc = tcon->ses->server->ops->set_integrity(xid,
205						tcon, pSMBFile);
206			else
207				rc = -EOPNOTSUPP;
208			break;
209		case CIFS_IOC_GET_MNT_INFO:
210			if (pSMBFile == NULL)
211				break;
212			tcon = tlink_tcon(pSMBFile->tlink);
213			rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
214			break;
215		case CIFS_ENUMERATE_SNAPSHOTS:
216			if (pSMBFile == NULL)
217				break;
218			if (arg == 0) {
219				rc = -EINVAL;
220				goto cifs_ioc_exit;
221			}
222			tcon = tlink_tcon(pSMBFile->tlink);
223			if (tcon->ses->server->ops->enum_snapshots)
224				rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
225						pSMBFile, (void __user *)arg);
226			else
227				rc = -EOPNOTSUPP;
228			break;
229		default:
230			cifs_dbg(FYI, "unsupported ioctl\n");
231			break;
232	}
233cifs_ioc_exit:
234	free_xid(xid);
235	return rc;
236}