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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/cifs/ioctl.c
3 *
4 * vfs operations that deal with io control
5 *
Steve French64a5cfa2013-10-14 15:31:32 -05006 * Copyright (C) International Business Machines Corp., 2005,2013
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * 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 */
Steve Frenchf654bac2005-04-28 22:41:04 -070023
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/fs.h>
Steve French41c13582013-11-14 00:05:36 -060025#include <linux/file.h>
26#include <linux/mount.h>
27#include <linux/mm.h>
28#include <linux/pagemap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include "cifspdu.h"
30#include "cifsglob.h"
31#include "cifsproto.h"
32#include "cifs_debug.h"
Steve Frenchc67593a2005-04-28 22:41:04 -070033#include "cifsfs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Steve Frenchf19e84d2013-11-24 21:53:17 -060035#define CIFS_IOCTL_MAGIC 0xCF
36#define CIFS_IOC_COPYCHUNK_FILE _IOW(CIFS_IOCTL_MAGIC, 3, int)
37
Steve French41c13582013-11-14 00:05:36 -060038static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
39 unsigned long srcfd, u64 off, u64 len, u64 destoff)
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
Libo Chen2d4f84b2013-12-11 11:02:27 +080088 src_inode = file_inode(src_file.file);
Steve French41c13582013-11-14 00:05:36 -060089
90 /*
91 * Note: cifs case is easier than btrfs since server responsible for
92 * checks for proper open modes and file type and if it wants
93 * server could even support copy of range where source = target
94 */
95
96 /* so we do not deadlock racing two ioctls on same files */
97 if (target_inode < src_inode) {
98 mutex_lock_nested(&target_inode->i_mutex, I_MUTEX_PARENT);
99 mutex_lock_nested(&src_inode->i_mutex, I_MUTEX_CHILD);
100 } else {
101 mutex_lock_nested(&src_inode->i_mutex, I_MUTEX_PARENT);
102 mutex_lock_nested(&target_inode->i_mutex, I_MUTEX_CHILD);
103 }
104
105 /* determine range to clone */
106 rc = -EINVAL;
107 if (off + len > src_inode->i_size || off + len < off)
108 goto out_unlock;
109 if (len == 0)
110 len = src_inode->i_size - off;
111
112 cifs_dbg(FYI, "about to flush pages\n");
113 /* should we flush first and last page first */
114 truncate_inode_pages_range(&target_inode->i_data, destoff,
115 PAGE_CACHE_ALIGN(destoff + len)-1);
116
117 if (target_tcon->ses->server->ops->clone_range)
118 rc = target_tcon->ses->server->ops->clone_range(xid,
119 smb_file_src, smb_file_target, off, len, destoff);
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;
124out_unlock:
125 /* although unlocking in the reverse order from locking is not
126 strictly necessary here it is a little cleaner to be consistent */
127 if (target_inode < src_inode) {
128 mutex_unlock(&src_inode->i_mutex);
129 mutex_unlock(&target_inode->i_mutex);
130 } else {
131 mutex_unlock(&target_inode->i_mutex);
132 mutex_unlock(&src_inode->i_mutex);
133 }
134out_fput:
135 fdput(src_file);
136out_drop_write:
137 mnt_drop_write_file(dst_file);
138 return rc;
139}
140
Steve Frenchf9ddcca2008-05-15 05:51:55 +0000141long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142{
Al Viro496ad9a2013-01-23 17:07:38 -0500143 struct inode *inode = file_inode(filep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 int rc = -ENOTTY; /* strange error - but the precedent */
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400145 unsigned int xid;
Steve Frenchc81156d2005-04-28 22:41:07 -0700146 struct cifs_sb_info *cifs_sb;
Jeff Laytonba00ba62010-09-20 16:01:31 -0700147 struct cifsFileInfo *pSMBFile = filep->private_data;
Steve French96daf2b2011-05-27 04:34:02 +0000148 struct cifs_tcon *tcon;
Steve Frenchf654bac2005-04-28 22:41:04 -0700149 __u64 ExtAttrBits = 0;
Jeff Layton61876392010-11-08 07:28:32 -0500150 __u64 caps;
Steve Frenchf654bac2005-04-28 22:41:04 -0700151
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400152 xid = get_xid();
Steve Frenchf654bac2005-04-28 22:41:04 -0700153
Joe Perchesf96637b2013-05-04 22:12:25 -0500154 cifs_dbg(FYI, "ioctl file %p cmd %u arg %lu\n", filep, command, arg);
Steve Frenchf28ac912005-04-28 22:41:07 -0700155
Steve Frenchf654bac2005-04-28 22:41:04 -0700156 cifs_sb = CIFS_SB(inode->i_sb);
Steve Frenchf654bac2005-04-28 22:41:04 -0700157
Steve French5fdae1f2007-06-05 18:30:44 +0000158 switch (command) {
David Howells36695672006-08-29 19:06:16 +0100159 case FS_IOC_GETFLAGS:
Jeff Layton61876392010-11-08 07:28:32 -0500160 if (pSMBFile == NULL)
161 break;
162 tcon = tlink_tcon(pSMBFile->tlink);
163 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
Steve French64a5cfa2013-10-14 15:31:32 -0500164#ifdef CONFIG_CIFS_POSIX
Steve French5fdae1f2007-06-05 18:30:44 +0000165 if (CIFS_UNIX_EXTATTR_CAP & caps) {
Steve Frenchf10d9ba2013-10-13 22:32:30 -0500166 __u64 ExtAttrMask = 0;
Pavel Shilovsky4b4de762012-09-18 16:20:26 -0700167 rc = CIFSGetExtAttr(xid, tcon,
168 pSMBFile->fid.netfid,
169 &ExtAttrBits, &ExtAttrMask);
Steve French5fdae1f2007-06-05 18:30:44 +0000170 if (rc == 0)
Steve Frenchf654bac2005-04-28 22:41:04 -0700171 rc = put_user(ExtAttrBits &
David Howells36695672006-08-29 19:06:16 +0100172 FS_FL_USER_VISIBLE,
Steve Frenchf654bac2005-04-28 22:41:04 -0700173 (int __user *)arg);
Steve French64a5cfa2013-10-14 15:31:32 -0500174 if (rc != EOPNOTSUPP)
175 break;
176 }
177#endif /* CONFIG_CIFS_POSIX */
178 rc = 0;
179 if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
180 /* add in the compressed bit */
181 ExtAttrBits = FS_COMPR_FL;
182 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
183 (int __user *)arg);
Steve Frenchf654bac2005-04-28 22:41:04 -0700184 }
185 break;
David Howells36695672006-08-29 19:06:16 +0100186 case FS_IOC_SETFLAGS:
Jeff Layton61876392010-11-08 07:28:32 -0500187 if (pSMBFile == NULL)
188 break;
189 tcon = tlink_tcon(pSMBFile->tlink);
190 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
Steve French64a5cfa2013-10-14 15:31:32 -0500191
192 if (get_user(ExtAttrBits, (int __user *)arg)) {
193 rc = -EFAULT;
194 break;
Steve Frenchf654bac2005-04-28 22:41:04 -0700195 }
Steve French64a5cfa2013-10-14 15:31:32 -0500196
197 /*
198 * if (CIFS_UNIX_EXTATTR_CAP & caps)
199 * rc = CIFSSetExtAttr(xid, tcon,
200 * pSMBFile->fid.netfid,
201 * extAttrBits,
202 * &ExtAttrMask);
203 * if (rc != EOPNOTSUPP)
204 * break;
205 */
206
207 /* Currently only flag we can set is compressed flag */
208 if ((ExtAttrBits & FS_COMPR_FL) == 0)
209 break;
210
211 /* Try to set compress flag */
212 if (tcon->ses->server->ops->set_compression) {
213 rc = tcon->ses->server->ops->set_compression(
214 xid, tcon, pSMBFile);
215 cifs_dbg(FYI, "set compress flag rc %d\n", rc);
216 }
Steve Frenchf654bac2005-04-28 22:41:04 -0700217 break;
Steve Frenchf19e84d2013-11-24 21:53:17 -0600218 case CIFS_IOC_COPYCHUNK_FILE:
Steve French41c13582013-11-14 00:05:36 -0600219 rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0);
220 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 default:
Joe Perchesf96637b2013-05-04 22:12:25 -0500222 cifs_dbg(FYI, "unsupported ioctl\n");
Steve Frenchf28ac912005-04-28 22:41:07 -0700223 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 }
Steve Frenchf654bac2005-04-28 22:41:04 -0700225
Pavel Shilovsky6d5786a2012-06-20 11:21:16 +0400226 free_xid(xid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 return rc;
Steve French5fdae1f2007-06-05 18:30:44 +0000228}