Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/cifs/ioctl.c | |
3 | * | |
4 | * vfs operations that deal with io control | |
5 | * | |
64a5cfa6 | 6 | * Copyright (C) International Business Machines Corp., 2005,2013 |
1da177e4 LT |
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 | */ | |
f654bac2 | 23 | |
1da177e4 | 24 | #include <linux/fs.h> |
41c1358e SF |
25 | #include <linux/file.h> |
26 | #include <linux/mount.h> | |
27 | #include <linux/mm.h> | |
28 | #include <linux/pagemap.h> | |
1da177e4 LT |
29 | #include "cifspdu.h" |
30 | #include "cifsglob.h" | |
31 | #include "cifsproto.h" | |
32 | #include "cifs_debug.h" | |
c67593a0 | 33 | #include "cifsfs.h" |
1da177e4 | 34 | |
f19e84df SF |
35 | #define CIFS_IOCTL_MAGIC 0xCF |
36 | #define CIFS_IOC_COPYCHUNK_FILE _IOW(CIFS_IOCTL_MAGIC, 3, int) | |
37 | ||
41c1358e SF |
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->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 | ||
2d4f84bd | 88 | src_inode = file_inode(src_file.file); |
41c1358e SF |
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; | |
124 | out_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 | } | |
134 | out_fput: | |
135 | fdput(src_file); | |
136 | out_drop_write: | |
137 | mnt_drop_write_file(dst_file); | |
138 | return rc; | |
139 | } | |
140 | ||
f9ddcca4 | 141 | long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg) |
1da177e4 | 142 | { |
496ad9aa | 143 | struct inode *inode = file_inode(filep); |
1da177e4 | 144 | int rc = -ENOTTY; /* strange error - but the precedent */ |
6d5786a3 | 145 | unsigned int xid; |
c81156dd | 146 | struct cifs_sb_info *cifs_sb; |
ba00ba64 | 147 | struct cifsFileInfo *pSMBFile = filep->private_data; |
96daf2b0 | 148 | struct cifs_tcon *tcon; |
f654bac2 | 149 | __u64 ExtAttrBits = 0; |
61876395 | 150 | __u64 caps; |
f654bac2 | 151 | |
6d5786a3 | 152 | xid = get_xid(); |
f654bac2 | 153 | |
f96637be | 154 | cifs_dbg(FYI, "ioctl file %p cmd %u arg %lu\n", filep, command, arg); |
f28ac91b | 155 | |
f654bac2 | 156 | cifs_sb = CIFS_SB(inode->i_sb); |
f654bac2 | 157 | |
5fdae1f6 | 158 | switch (command) { |
36695673 | 159 | case FS_IOC_GETFLAGS: |
61876395 JL |
160 | if (pSMBFile == NULL) |
161 | break; | |
162 | tcon = tlink_tcon(pSMBFile->tlink); | |
163 | caps = le64_to_cpu(tcon->fsUnixInfo.Capability); | |
64a5cfa6 | 164 | #ifdef CONFIG_CIFS_POSIX |
5fdae1f6 | 165 | if (CIFS_UNIX_EXTATTR_CAP & caps) { |
f10d9ba4 | 166 | __u64 ExtAttrMask = 0; |
4b4de76e PS |
167 | rc = CIFSGetExtAttr(xid, tcon, |
168 | pSMBFile->fid.netfid, | |
169 | &ExtAttrBits, &ExtAttrMask); | |
5fdae1f6 | 170 | if (rc == 0) |
f654bac2 | 171 | rc = put_user(ExtAttrBits & |
36695673 | 172 | FS_FL_USER_VISIBLE, |
f654bac2 | 173 | (int __user *)arg); |
64a5cfa6 SF |
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); | |
f654bac2 SF |
184 | } |
185 | break; | |
36695673 | 186 | case FS_IOC_SETFLAGS: |
61876395 JL |
187 | if (pSMBFile == NULL) |
188 | break; | |
189 | tcon = tlink_tcon(pSMBFile->tlink); | |
190 | caps = le64_to_cpu(tcon->fsUnixInfo.Capability); | |
64a5cfa6 SF |
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); | |
f654bac2 | 216 | } |
f654bac2 | 217 | break; |
f19e84df | 218 | case CIFS_IOC_COPYCHUNK_FILE: |
41c1358e SF |
219 | rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0); |
220 | break; | |
1da177e4 | 221 | default: |
f96637be | 222 | cifs_dbg(FYI, "unsupported ioctl\n"); |
f28ac91b | 223 | break; |
1da177e4 | 224 | } |
f654bac2 | 225 | |
6d5786a3 | 226 | free_xid(xid); |
1da177e4 | 227 | return rc; |
5fdae1f6 | 228 | } |