4 * vfs operations that deal with io control
6 * Copyright (C) International Business Machines Corp., 2005,2013
7 * Author(s): Steve French (sfrench@us.ibm.com)
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.
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.
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
25 #include <linux/file.h>
26 #include <linux/mount.h>
28 #include <linux/pagemap.h>
31 #include "cifsproto.h"
32 #include "cifs_debug.h"
35 #define CIFS_IOCTL_MAGIC 0xCF
36 #define CIFS_IOC_COPYCHUNK_FILE _IOW(CIFS_IOCTL_MAGIC, 3, int)
38 static long cifs_ioctl_clone(unsigned int xid
, struct file
*dst_file
,
39 unsigned long srcfd
, u64 off
, u64 len
, u64 destoff
)
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
;
46 struct cifsFileInfo
*smb_file_src
;
47 struct inode
*src_inode
;
48 struct cifs_tcon
*src_tcon
;
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");
57 /* check if target volume is readonly and take reference */
58 rc
= mnt_want_write_file(dst_file
);
60 cifs_dbg(FYI
, "mnt_want_write failed with rc %d\n", rc
);
64 src_file
= fdget(srcfd
);
70 if ((!src_file
.file
->private_data
) || (!dst_file
->private_data
)) {
72 cifs_dbg(VFS
, "missing cifsFileInfo on copy range src file\n");
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
);
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");
88 src_inode
= src_file
.file
->f_dentry
->d_inode
;
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
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
);
101 mutex_lock_nested(&src_inode
->i_mutex
, I_MUTEX_PARENT
);
102 mutex_lock_nested(&target_inode
->i_mutex
, I_MUTEX_CHILD
);
105 /* determine range to clone */
107 if (off
+ len
> src_inode
->i_size
|| off
+ len
< off
)
110 len
= src_inode
->i_size
- off
;
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);
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
);
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;
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
);
131 mutex_unlock(&target_inode
->i_mutex
);
132 mutex_unlock(&src_inode
->i_mutex
);
137 mnt_drop_write_file(dst_file
);
141 long cifs_ioctl(struct file
*filep
, unsigned int command
, unsigned long arg
)
143 struct inode
*inode
= file_inode(filep
);
144 int rc
= -ENOTTY
; /* strange error - but the precedent */
146 struct cifs_sb_info
*cifs_sb
;
147 struct cifsFileInfo
*pSMBFile
= filep
->private_data
;
148 struct cifs_tcon
*tcon
;
149 __u64 ExtAttrBits
= 0;
154 cifs_dbg(FYI
, "ioctl file %p cmd %u arg %lu\n", filep
, command
, arg
);
156 cifs_sb
= CIFS_SB(inode
->i_sb
);
159 case FS_IOC_GETFLAGS
:
160 if (pSMBFile
== NULL
)
162 tcon
= tlink_tcon(pSMBFile
->tlink
);
163 caps
= le64_to_cpu(tcon
->fsUnixInfo
.Capability
);
164 #ifdef CONFIG_CIFS_POSIX
165 if (CIFS_UNIX_EXTATTR_CAP
& caps
) {
166 __u64 ExtAttrMask
= 0;
167 rc
= CIFSGetExtAttr(xid
, tcon
,
168 pSMBFile
->fid
.netfid
,
169 &ExtAttrBits
, &ExtAttrMask
);
171 rc
= put_user(ExtAttrBits
&
174 if (rc
!= EOPNOTSUPP
)
177 #endif /* CONFIG_CIFS_POSIX */
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
,
186 case FS_IOC_SETFLAGS
:
187 if (pSMBFile
== NULL
)
189 tcon
= tlink_tcon(pSMBFile
->tlink
);
190 caps
= le64_to_cpu(tcon
->fsUnixInfo
.Capability
);
192 if (get_user(ExtAttrBits
, (int __user
*)arg
)) {
198 * if (CIFS_UNIX_EXTATTR_CAP & caps)
199 * rc = CIFSSetExtAttr(xid, tcon,
200 * pSMBFile->fid.netfid,
203 * if (rc != EOPNOTSUPP)
207 /* Currently only flag we can set is compressed flag */
208 if ((ExtAttrBits
& FS_COMPR_FL
) == 0)
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
);
218 case CIFS_IOC_COPYCHUNK_FILE
:
219 rc
= cifs_ioctl_clone(xid
, filep
, arg
, 0, 0, 0);
222 cifs_dbg(FYI
, "unsupported ioctl\n");