Linux kernel mirror (for testing)
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linux
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
35#define CIFS_IOCTL_MAGIC 0xCF
36#define CIFS_IOC_COPYCHUNK_FILE _IOW(CIFS_IOCTL_MAGIC, 3, int)
37
38static 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
88 src_inode = file_inode(src_file.file);
89
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
141long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
142{
143 struct inode *inode = file_inode(filep);
144 int rc = -ENOTTY; /* strange error - but the precedent */
145 unsigned int xid;
146 struct cifs_sb_info *cifs_sb;
147 struct cifsFileInfo *pSMBFile = filep->private_data;
148 struct cifs_tcon *tcon;
149 __u64 ExtAttrBits = 0;
150 __u64 caps;
151
152 xid = get_xid();
153
154 cifs_dbg(FYI, "ioctl file %p cmd %u arg %lu\n", filep, command, arg);
155
156 cifs_sb = CIFS_SB(inode->i_sb);
157
158 switch (command) {
159 case FS_IOC_GETFLAGS:
160 if (pSMBFile == NULL)
161 break;
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);
170 if (rc == 0)
171 rc = put_user(ExtAttrBits &
172 FS_FL_USER_VISIBLE,
173 (int __user *)arg);
174 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);
184 }
185 break;
186 case FS_IOC_SETFLAGS:
187 if (pSMBFile == NULL)
188 break;
189 tcon = tlink_tcon(pSMBFile->tlink);
190 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
191
192 if (get_user(ExtAttrBits, (int __user *)arg)) {
193 rc = -EFAULT;
194 break;
195 }
196
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 }
217 break;
218 case CIFS_IOC_COPYCHUNK_FILE:
219 rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0);
220 break;
221 default:
222 cifs_dbg(FYI, "unsupported ioctl\n");
223 break;
224 }
225
226 free_xid(xid);
227 return rc;
228}