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>
29 #include <linux/btrfs.h>
32 #include "cifsproto.h"
33 #include "cifs_debug.h"
36 static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
37 unsigned long srcfd, u64 off, u64 len, u64 destoff)
40 struct cifsFileInfo *smb_file_target = dst_file->private_data;
41 struct inode *target_inode = file_inode(dst_file);
42 struct cifs_tcon *target_tcon;
44 struct cifsFileInfo *smb_file_src;
45 struct inode *src_inode;
46 struct cifs_tcon *src_tcon;
48 cifs_dbg(FYI, "ioctl clone range\n");
49 /* the destination must be opened for writing */
50 if (!(dst_file->f_mode & FMODE_WRITE)) {
51 cifs_dbg(FYI, "file target not open for write\n");
55 /* check if target volume is readonly and take reference */
56 rc = mnt_want_write_file(dst_file);
58 cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
62 src_file = fdget(srcfd);
68 if ((!src_file.file->private_data) || (!dst_file->private_data)) {
70 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
75 smb_file_target = dst_file->private_data;
76 smb_file_src = src_file.file->private_data;
77 src_tcon = tlink_tcon(smb_file_src->tlink);
78 target_tcon = tlink_tcon(smb_file_target->tlink);
80 /* check if source and target are on same tree connection */
81 if (src_tcon != target_tcon) {
82 cifs_dbg(VFS, "file copy src and target on different volume\n");
86 src_inode = src_file.file->f_dentry->d_inode;
88 /* Note: cifs case is easier than btrfs since server responsible for */
89 /* checks for proper open modes and file type and if it wants */
90 /* server could even support copy of range where source = target */
92 /* so we do not deadlock racing two ioctls on same files */
93 /* btrfs does a similar check */
94 if (target_inode < src_inode) {
95 mutex_lock_nested(&target_inode->i_mutex, I_MUTEX_PARENT);
96 mutex_lock_nested(&src_inode->i_mutex, I_MUTEX_CHILD);
98 mutex_lock_nested(&src_inode->i_mutex, I_MUTEX_PARENT);
99 mutex_lock_nested(&target_inode->i_mutex, I_MUTEX_CHILD);
102 /* determine range to clone */
104 if (off + len > src_inode->i_size || off + len < off)
107 len = src_inode->i_size - off;
109 cifs_dbg(FYI, "about to flush pages\n");
110 /* should we flush first and last page first */
111 truncate_inode_pages_range(&target_inode->i_data, destoff,
112 PAGE_CACHE_ALIGN(destoff + len)-1);
114 if (target_tcon->ses->server->ops->clone_range)
115 rc = target_tcon->ses->server->ops->clone_range(xid,
116 smb_file_src, smb_file_target, off, len, destoff);
118 /* force revalidate of size and timestamps of target file now
119 that target is updated on the server */
120 CIFS_I(target_inode)->time = 0;
122 mutex_unlock(&src_inode->i_mutex);
123 mutex_unlock(&target_inode->i_mutex);
127 mnt_drop_write_file(dst_file);
131 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
133 struct inode *inode = file_inode(filep);
134 int rc = -ENOTTY; /* strange error - but the precedent */
136 struct cifs_sb_info *cifs_sb;
137 struct cifsFileInfo *pSMBFile = filep->private_data;
138 struct cifs_tcon *tcon;
139 __u64 ExtAttrBits = 0;
144 cifs_dbg(FYI, "ioctl file %p cmd %u arg %lu\n", filep, command, arg);
146 cifs_sb = CIFS_SB(inode->i_sb);
149 case FS_IOC_GETFLAGS:
150 if (pSMBFile == NULL)
152 tcon = tlink_tcon(pSMBFile->tlink);
153 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
154 #ifdef CONFIG_CIFS_POSIX
155 if (CIFS_UNIX_EXTATTR_CAP & caps) {
156 __u64 ExtAttrMask = 0;
157 rc = CIFSGetExtAttr(xid, tcon,
158 pSMBFile->fid.netfid,
159 &ExtAttrBits, &ExtAttrMask);
161 rc = put_user(ExtAttrBits &
164 if (rc != EOPNOTSUPP)
167 #endif /* CONFIG_CIFS_POSIX */
169 if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
170 /* add in the compressed bit */
171 ExtAttrBits = FS_COMPR_FL;
172 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
176 case FS_IOC_SETFLAGS:
177 if (pSMBFile == NULL)
179 tcon = tlink_tcon(pSMBFile->tlink);
180 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
182 if (get_user(ExtAttrBits, (int __user *)arg)) {
188 * if (CIFS_UNIX_EXTATTR_CAP & caps)
189 * rc = CIFSSetExtAttr(xid, tcon,
190 * pSMBFile->fid.netfid,
193 * if (rc != EOPNOTSUPP)
197 /* Currently only flag we can set is compressed flag */
198 if ((ExtAttrBits & FS_COMPR_FL) == 0)
201 /* Try to set compress flag */
202 if (tcon->ses->server->ops->set_compression) {
203 rc = tcon->ses->server->ops->set_compression(
204 xid, tcon, pSMBFile);
205 cifs_dbg(FYI, "set compress flag rc %d\n", rc);
208 case BTRFS_IOC_CLONE:
209 rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0);
212 cifs_dbg(FYI, "unsupported ioctl\n");