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#include "cifs_ioctl.h"
35#include <linux/btrfs.h>
36
37static long cifs_ioctl_copychunk(unsigned int xid, struct file *dst_file,
38 unsigned long srcfd)
39{
40 int rc;
41 struct fd src_file;
42 struct inode *src_inode;
43
44 cifs_dbg(FYI, "ioctl copychunk range\n");
45 /* the destination must be opened for writing */
46 if (!(dst_file->f_mode & FMODE_WRITE)) {
47 cifs_dbg(FYI, "file target not open for write\n");
48 return -EINVAL;
49 }
50
51 /* check if target volume is readonly and take reference */
52 rc = mnt_want_write_file(dst_file);
53 if (rc) {
54 cifs_dbg(FYI, "mnt_want_write failed with rc %d\n", rc);
55 return rc;
56 }
57
58 src_file = fdget(srcfd);
59 if (!src_file.file) {
60 rc = -EBADF;
61 goto out_drop_write;
62 }
63
64 if (src_file.file->f_op->unlocked_ioctl != cifs_ioctl) {
65 rc = -EBADF;
66 cifs_dbg(VFS, "src file seems to be from a different filesystem type\n");
67 goto out_fput;
68 }
69
70 src_inode = file_inode(src_file.file);
71 rc = -EINVAL;
72 if (S_ISDIR(src_inode->i_mode))
73 goto out_fput;
74
75 rc = cifs_file_copychunk_range(xid, src_file.file, 0, dst_file, 0,
76 src_inode->i_size, 0);
77 if (rc > 0)
78 rc = 0;
79out_fput:
80 fdput(src_file);
81out_drop_write:
82 mnt_drop_write_file(dst_file);
83 return rc;
84}
85
86static long smb_mnt_get_fsinfo(unsigned int xid, struct cifs_tcon *tcon,
87 void __user *arg)
88{
89 int rc = 0;
90 struct smb_mnt_fs_info *fsinf;
91
92 fsinf = kzalloc(sizeof(struct smb_mnt_fs_info), GFP_KERNEL);
93 if (fsinf == NULL)
94 return -ENOMEM;
95
96 fsinf->version = 1;
97 fsinf->protocol_id = tcon->ses->server->vals->protocol_id;
98 fsinf->device_characteristics =
99 le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics);
100 fsinf->device_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
101 fsinf->fs_attributes = le32_to_cpu(tcon->fsAttrInfo.Attributes);
102 fsinf->max_path_component =
103 le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength);
104 fsinf->vol_serial_number = tcon->vol_serial_number;
105 fsinf->vol_create_time = le64_to_cpu(tcon->vol_create_time);
106 fsinf->share_flags = tcon->share_flags;
107 fsinf->share_caps = le32_to_cpu(tcon->capabilities);
108 fsinf->sector_flags = tcon->ss_flags;
109 fsinf->optimal_sector_size = tcon->perf_sector_size;
110 fsinf->max_bytes_chunk = tcon->max_bytes_chunk;
111 fsinf->maximal_access = tcon->maximal_access;
112 fsinf->cifs_posix_caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
113
114 if (copy_to_user(arg, fsinf, sizeof(struct smb_mnt_fs_info)))
115 rc = -EFAULT;
116
117 kfree(fsinf);
118 return rc;
119}
120
121long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
122{
123 struct inode *inode = file_inode(filep);
124 int rc = -ENOTTY; /* strange error - but the precedent */
125 unsigned int xid;
126 struct cifs_sb_info *cifs_sb;
127 struct cifsFileInfo *pSMBFile = filep->private_data;
128 struct cifs_tcon *tcon;
129 __u64 ExtAttrBits = 0;
130 __u64 caps;
131
132 xid = get_xid();
133
134 cifs_sb = CIFS_SB(inode->i_sb);
135 cifs_dbg(FYI, "cifs ioctl 0x%x\n", command);
136 switch (command) {
137 case FS_IOC_GETFLAGS:
138 if (pSMBFile == NULL)
139 break;
140 tcon = tlink_tcon(pSMBFile->tlink);
141 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
142#ifdef CONFIG_CIFS_POSIX
143 if (CIFS_UNIX_EXTATTR_CAP & caps) {
144 __u64 ExtAttrMask = 0;
145 rc = CIFSGetExtAttr(xid, tcon,
146 pSMBFile->fid.netfid,
147 &ExtAttrBits, &ExtAttrMask);
148 if (rc == 0)
149 rc = put_user(ExtAttrBits &
150 FS_FL_USER_VISIBLE,
151 (int __user *)arg);
152 if (rc != EOPNOTSUPP)
153 break;
154 }
155#endif /* CONFIG_CIFS_POSIX */
156 rc = 0;
157 if (CIFS_I(inode)->cifsAttrs & ATTR_COMPRESSED) {
158 /* add in the compressed bit */
159 ExtAttrBits = FS_COMPR_FL;
160 rc = put_user(ExtAttrBits & FS_FL_USER_VISIBLE,
161 (int __user *)arg);
162 }
163 break;
164 case FS_IOC_SETFLAGS:
165 if (pSMBFile == NULL)
166 break;
167 tcon = tlink_tcon(pSMBFile->tlink);
168 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
169
170 if (get_user(ExtAttrBits, (int __user *)arg)) {
171 rc = -EFAULT;
172 break;
173 }
174
175 /*
176 * if (CIFS_UNIX_EXTATTR_CAP & caps)
177 * rc = CIFSSetExtAttr(xid, tcon,
178 * pSMBFile->fid.netfid,
179 * extAttrBits,
180 * &ExtAttrMask);
181 * if (rc != EOPNOTSUPP)
182 * break;
183 */
184
185 /* Currently only flag we can set is compressed flag */
186 if ((ExtAttrBits & FS_COMPR_FL) == 0)
187 break;
188
189 /* Try to set compress flag */
190 if (tcon->ses->server->ops->set_compression) {
191 rc = tcon->ses->server->ops->set_compression(
192 xid, tcon, pSMBFile);
193 cifs_dbg(FYI, "set compress flag rc %d\n", rc);
194 }
195 break;
196 case CIFS_IOC_COPYCHUNK_FILE:
197 rc = cifs_ioctl_copychunk(xid, filep, arg);
198 break;
199 case CIFS_IOC_SET_INTEGRITY:
200 if (pSMBFile == NULL)
201 break;
202 tcon = tlink_tcon(pSMBFile->tlink);
203 if (tcon->ses->server->ops->set_integrity)
204 rc = tcon->ses->server->ops->set_integrity(xid,
205 tcon, pSMBFile);
206 else
207 rc = -EOPNOTSUPP;
208 break;
209 case CIFS_IOC_GET_MNT_INFO:
210 if (pSMBFile == NULL)
211 break;
212 tcon = tlink_tcon(pSMBFile->tlink);
213 rc = smb_mnt_get_fsinfo(xid, tcon, (void __user *)arg);
214 break;
215 case CIFS_ENUMERATE_SNAPSHOTS:
216 if (pSMBFile == NULL)
217 break;
218 if (arg == 0) {
219 rc = -EINVAL;
220 goto cifs_ioc_exit;
221 }
222 tcon = tlink_tcon(pSMBFile->tlink);
223 if (tcon->ses->server->ops->enum_snapshots)
224 rc = tcon->ses->server->ops->enum_snapshots(xid, tcon,
225 pSMBFile, (void __user *)arg);
226 else
227 rc = -EOPNOTSUPP;
228 break;
229 default:
230 cifs_dbg(FYI, "unsupported ioctl\n");
231 break;
232 }
233cifs_ioc_exit:
234 free_xid(xid);
235 return rc;
236}