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 rc = -EINVAL;
90 if (S_ISDIR(src_inode->i_mode))
91 goto out_fput;
92
93 /*
94 * Note: cifs case is easier than btrfs since server responsible for
95 * checks for proper open modes and file type and if it wants
96 * server could even support copy of range where source = target
97 */
98 lock_two_nondirectories(target_inode, src_inode);
99
100 /* determine range to clone */
101 rc = -EINVAL;
102 if (off + len > src_inode->i_size || off + len < off)
103 goto out_unlock;
104 if (len == 0)
105 len = src_inode->i_size - off;
106
107 cifs_dbg(FYI, "about to flush pages\n");
108 /* should we flush first and last page first */
109 truncate_inode_pages_range(&target_inode->i_data, destoff,
110 PAGE_CACHE_ALIGN(destoff + len)-1);
111
112 if (target_tcon->ses->server->ops->clone_range)
113 rc = target_tcon->ses->server->ops->clone_range(xid,
114 smb_file_src, smb_file_target, off, len, destoff);
115
116 /* force revalidate of size and timestamps of target file now
117 that target is updated on the server */
118 CIFS_I(target_inode)->time = 0;
119out_unlock:
120 /* although unlocking in the reverse order from locking is not
121 strictly necessary here it is a little cleaner to be consistent */
122 unlock_two_nondirectories(src_inode, target_inode);
123out_fput:
124 fdput(src_file);
125out_drop_write:
126 mnt_drop_write_file(dst_file);
127 return rc;
128}
129
130long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
131{
132 struct inode *inode = file_inode(filep);
133 int rc = -ENOTTY; /* strange error - but the precedent */
134 unsigned int xid;
135 struct cifs_sb_info *cifs_sb;
136 struct cifsFileInfo *pSMBFile = filep->private_data;
137 struct cifs_tcon *tcon;
138 __u64 ExtAttrBits = 0;
139 __u64 caps;
140
141 xid = get_xid();
142
143 cifs_dbg(FYI, "ioctl file %p cmd %u arg %lu\n", filep, command, arg);
144
145 cifs_sb = CIFS_SB(inode->i_sb);
146
147 switch (command) {
148 case FS_IOC_GETFLAGS:
149 if (pSMBFile == NULL)
150 break;
151 tcon = tlink_tcon(pSMBFile->tlink);
152 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
153#ifdef CONFIG_CIFS_POSIX
154 if (CIFS_UNIX_EXTATTR_CAP & caps) {
155 __u64 ExtAttrMask = 0;
156 rc = CIFSGetExtAttr(xid, tcon,
157 pSMBFile->fid.netfid,
158 &ExtAttrBits, &ExtAttrMask);
159 if (rc == 0)
160 rc = put_user(ExtAttrBits &
161 FS_FL_USER_VISIBLE,
162 (int __user *)arg);
163 if (rc != EOPNOTSUPP)
164 break;
165 }
166#endif /* CONFIG_CIFS_POSIX */
167 rc = 0;
168 if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
169 /* add in the compressed bit */
170 ExtAttrBits = FS_COMPR_FL;
171 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
172 (int __user *)arg);
173 }
174 break;
175 case FS_IOC_SETFLAGS:
176 if (pSMBFile == NULL)
177 break;
178 tcon = tlink_tcon(pSMBFile->tlink);
179 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
180
181 if (get_user(ExtAttrBits, (int __user *)arg)) {
182 rc = -EFAULT;
183 break;
184 }
185
186 /*
187 * if (CIFS_UNIX_EXTATTR_CAP & caps)
188 * rc = CIFSSetExtAttr(xid, tcon,
189 * pSMBFile->fid.netfid,
190 * extAttrBits,
191 * &ExtAttrMask);
192 * if (rc != EOPNOTSUPP)
193 * break;
194 */
195
196 /* Currently only flag we can set is compressed flag */
197 if ((ExtAttrBits & FS_COMPR_FL) == 0)
198 break;
199
200 /* Try to set compress flag */
201 if (tcon->ses->server->ops->set_compression) {
202 rc = tcon->ses->server->ops->set_compression(
203 xid, tcon, pSMBFile);
204 cifs_dbg(FYI, "set compress flag rc %d\n", rc);
205 }
206 break;
207 case CIFS_IOC_COPYCHUNK_FILE:
208 rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0);
209 break;
210 default:
211 cifs_dbg(FYI, "unsupported ioctl\n");
212 break;
213 }
214
215 free_xid(xid);
216 return rc;
217}