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
cifs_ioctl_clone(unsigned int xid,struct file * dst_file,unsigned long srcfd,u64 off,u64 len,u64 destoff)38 static 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->f_op->unlocked_ioctl != cifs_ioctl) {
71 rc = -EBADF;
72 cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
73 goto out_fput;
74 }
75
76 if ((!src_file.file->private_data) || (!dst_file->private_data)) {
77 rc = -EBADF;
78 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
79 goto out_fput;
80 }
81
82 rc = -EXDEV;
83 smb_file_target = dst_file->private_data;
84 smb_file_src = src_file.file->private_data;
85 src_tcon = tlink_tcon(smb_file_src->tlink);
86 target_tcon = tlink_tcon(smb_file_target->tlink);
87
88 /* check if source and target are on same tree connection */
89 if (src_tcon != target_tcon) {
90 cifs_dbg(VFS, "file copy src and target on different volume\n");
91 goto out_fput;
92 }
93
94 src_inode = file_inode(src_file.file);
95 rc = -EINVAL;
96 if (S_ISDIR(src_inode->i_mode))
97 goto out_fput;
98
99 /*
100 * Note: cifs case is easier than btrfs since server responsible for
101 * checks for proper open modes and file type and if it wants
102 * server could even support copy of range where source = target
103 */
104 lock_two_nondirectories(target_inode, src_inode);
105
106 /* determine range to clone */
107 rc = -EINVAL;
108 if (off + len > src_inode->i_size || off + len < off)
109 goto out_unlock;
110 if (len == 0)
111 len = src_inode->i_size - off;
112
113 cifs_dbg(FYI, "about to flush pages\n");
114 /* should we flush first and last page first */
115 truncate_inode_pages_range(&target_inode->i_data, destoff,
116 PAGE_CACHE_ALIGN(destoff + len)-1);
117
118 if (target_tcon->ses->server->ops->clone_range)
119 rc = target_tcon->ses->server->ops->clone_range(xid,
120 smb_file_src, smb_file_target, off, len, destoff);
121
122 /* force revalidate of size and timestamps of target file now
123 that target is updated on the server */
124 CIFS_I(target_inode)->time = 0;
125 out_unlock:
126 /* although unlocking in the reverse order from locking is not
127 strictly necessary here it is a little cleaner to be consistent */
128 unlock_two_nondirectories(src_inode, target_inode);
129 out_fput:
130 fdput(src_file);
131 out_drop_write:
132 mnt_drop_write_file(dst_file);
133 return rc;
134 }
135
cifs_ioctl(struct file * filep,unsigned int command,unsigned long arg)136 long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
137 {
138 struct inode *inode = file_inode(filep);
139 int rc = -ENOTTY; /* strange error - but the precedent */
140 unsigned int xid;
141 struct cifs_sb_info *cifs_sb;
142 struct cifsFileInfo *pSMBFile = filep->private_data;
143 struct cifs_tcon *tcon;
144 __u64 ExtAttrBits = 0;
145 __u64 caps;
146
147 xid = get_xid();
148
149 cifs_dbg(FYI, "ioctl file %p cmd %u arg %lu\n", filep, command, arg);
150
151 cifs_sb = CIFS_SB(inode->i_sb);
152
153 switch (command) {
154 case FS_IOC_GETFLAGS:
155 if (pSMBFile == NULL)
156 break;
157 tcon = tlink_tcon(pSMBFile->tlink);
158 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
159 #ifdef CONFIG_CIFS_POSIX
160 if (CIFS_UNIX_EXTATTR_CAP & caps) {
161 __u64 ExtAttrMask = 0;
162 rc = CIFSGetExtAttr(xid, tcon,
163 pSMBFile->fid.netfid,
164 &ExtAttrBits, &ExtAttrMask);
165 if (rc == 0)
166 rc = put_user(ExtAttrBits &
167 FS_FL_USER_VISIBLE,
168 (int __user *)arg);
169 if (rc != EOPNOTSUPP)
170 break;
171 }
172 #endif /* CONFIG_CIFS_POSIX */
173 rc = 0;
174 if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
175 /* add in the compressed bit */
176 ExtAttrBits = FS_COMPR_FL;
177 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
178 (int __user *)arg);
179 }
180 break;
181 case FS_IOC_SETFLAGS:
182 if (pSMBFile == NULL)
183 break;
184 tcon = tlink_tcon(pSMBFile->tlink);
185 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
186
187 if (get_user(ExtAttrBits, (int __user *)arg)) {
188 rc = -EFAULT;
189 break;
190 }
191
192 /*
193 * if (CIFS_UNIX_EXTATTR_CAP & caps)
194 * rc = CIFSSetExtAttr(xid, tcon,
195 * pSMBFile->fid.netfid,
196 * extAttrBits,
197 * &ExtAttrMask);
198 * if (rc != EOPNOTSUPP)
199 * break;
200 */
201
202 /* Currently only flag we can set is compressed flag */
203 if ((ExtAttrBits & FS_COMPR_FL) == 0)
204 break;
205
206 /* Try to set compress flag */
207 if (tcon->ses->server->ops->set_compression) {
208 rc = tcon->ses->server->ops->set_compression(
209 xid, tcon, pSMBFile);
210 cifs_dbg(FYI, "set compress flag rc %d\n", rc);
211 }
212 break;
213 case CIFS_IOC_COPYCHUNK_FILE:
214 rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0);
215 break;
216 default:
217 cifs_dbg(FYI, "unsupported ioctl\n");
218 break;
219 }
220
221 free_xid(xid);
222 return rc;
223 }
224