4 * Copyright (C) International Business Machines Corp., 2002,2003
5 * Author(s): Steve French (sfrench@us.ibm.com)
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/stat.h>
23 #include <linux/namei.h>
27 #include "cifsproto.h"
28 #include "cifs_debug.h"
29 #include "cifs_fs_sb.h"
32 cifs_hardlink(struct dentry
*old_file
, struct inode
*inode
,
33 struct dentry
*direntry
)
37 char *fromName
= NULL
;
39 struct cifs_sb_info
*cifs_sb_target
;
40 struct cifsTconInfo
*pTcon
;
41 struct cifsInodeInfo
*cifsInode
;
45 cifs_sb_target
= CIFS_SB(inode
->i_sb
);
46 pTcon
= cifs_sb_target
->tcon
;
48 /* No need to check for cross device links since server will do that
49 BB note DFS case in future though (when we may have to check) */
51 fromName
= build_path_from_dentry(old_file
);
52 toName
= build_path_from_dentry(direntry
);
53 if ((fromName
== NULL
) || (toName
== NULL
)) {
58 if (cifs_sb_target
->tcon
->ses
->capabilities
& CAP_UNIX
)
59 rc
= CIFSUnixCreateHardLink(xid
, pTcon
, fromName
, toName
,
60 cifs_sb_target
->local_nls
,
61 cifs_sb_target
->mnt_cifs_flags
&
62 CIFS_MOUNT_MAP_SPECIAL_CHR
);
64 rc
= CIFSCreateHardLink(xid
, pTcon
, fromName
, toName
,
65 cifs_sb_target
->local_nls
,
66 cifs_sb_target
->mnt_cifs_flags
&
67 CIFS_MOUNT_MAP_SPECIAL_CHR
);
68 if ((rc
== -EIO
) || (rc
== -EINVAL
))
72 d_drop(direntry
); /* force new lookup from server of target */
74 /* if source file is cached (oplocked) revalidate will not go to server
75 until the file is closed or oplock broken so update nlinks locally */
76 if (old_file
->d_inode
) {
77 cifsInode
= CIFS_I(old_file
->d_inode
);
79 old_file
->d_inode
->i_nlink
++;
80 /* BB should we make this contingent on superblock flag NOATIME? */
81 /* old_file->d_inode->i_ctime = CURRENT_TIME;*/
82 /* parent dir timestamps will update from srv
83 within a second, would it really be worth it
84 to set the parent dir cifs inode time to zero
85 to force revalidate (faster) for it too? */
87 /* if not oplocked will force revalidate to get info
88 on source file from srv */
91 /* Will update parent dir timestamps from srv within a second.
92 Would it really be worth it to set the parent dir (cifs
93 inode) time field to zero to force revalidate on parent
95 CIFS_I(inode)->time = 0; */
106 cifs_follow_link(struct dentry
*direntry
, struct nameidata
*nd
)
108 struct inode
*inode
= direntry
->d_inode
;
111 char *full_path
= NULL
;
112 char *target_path
= ERR_PTR(-ENOMEM
);
113 struct cifs_sb_info
*cifs_sb
;
114 struct cifsTconInfo
*pTcon
;
118 full_path
= build_path_from_dentry(direntry
);
123 cFYI(1, ("Full path: %s inode = 0x%p", full_path
, inode
));
124 cifs_sb
= CIFS_SB(inode
->i_sb
);
125 pTcon
= cifs_sb
->tcon
;
126 target_path
= kmalloc(PATH_MAX
, GFP_KERNEL
);
128 target_path
= ERR_PTR(-ENOMEM
);
132 /* BB add read reparse point symlink code and Unix extensions
133 symlink code here BB */
134 if (pTcon
->ses
->capabilities
& CAP_UNIX
)
135 rc
= CIFSSMBUnixQuerySymLink(xid
, pTcon
, full_path
,
140 /* rc = CIFSSMBQueryReparseLinkInfo */
141 /* BB Add code to Query ReparsePoint info */
142 /* BB Add MAC style xsymlink check here if enabled */
147 /* BB Add special case check for Samba DFS symlinks */
149 target_path
[PATH_MAX
-1] = 0;
152 target_path
= ERR_PTR(rc
);
159 nd_set_link(nd
, target_path
);
160 return NULL
; /* No cookie */
164 cifs_symlink(struct inode
*inode
, struct dentry
*direntry
, const char *symname
)
166 int rc
= -EOPNOTSUPP
;
168 struct cifs_sb_info
*cifs_sb
;
169 struct cifsTconInfo
*pTcon
;
170 char *full_path
= NULL
;
171 struct inode
*newinode
= NULL
;
175 cifs_sb
= CIFS_SB(inode
->i_sb
);
176 pTcon
= cifs_sb
->tcon
;
178 full_path
= build_path_from_dentry(direntry
);
180 if (full_path
== NULL
) {
185 cFYI(1, ("Full path: %s", full_path
));
186 cFYI(1, ("symname is %s", symname
));
188 /* BB what if DFS and this volume is on different share? BB */
189 if (cifs_sb
->tcon
->ses
->capabilities
& CAP_UNIX
)
190 rc
= CIFSUnixCreateSymLink(xid
, pTcon
, full_path
, symname
,
193 rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,
194 cifs_sb_target->local_nls); */
197 if (pTcon
->ses
->capabilities
& CAP_UNIX
)
198 rc
= cifs_get_inode_info_unix(&newinode
, full_path
,
201 rc
= cifs_get_inode_info(&newinode
, full_path
, NULL
,
205 cFYI(1, ("Create symlink ok, getinodeinfo fail rc = %d",
209 direntry
->d_op
= &cifs_ci_dentry_ops
;
211 direntry
->d_op
= &cifs_dentry_ops
;
212 d_instantiate(direntry
, newinode
);
222 cifs_readlink(struct dentry
*direntry
, char __user
*pBuffer
, int buflen
)
224 struct inode
*inode
= direntry
->d_inode
;
228 struct cifs_sb_info
*cifs_sb
;
229 struct cifsTconInfo
*pTcon
;
230 char *full_path
= NULL
;
231 char *tmp_path
= NULL
;
233 unsigned char *referrals
= NULL
;
234 int num_referrals
= 0;
239 cifs_sb
= CIFS_SB(inode
->i_sb
);
240 pTcon
= cifs_sb
->tcon
;
242 /* BB would it be safe against deadlock to grab this sem
243 even though rename itself grabs the sem and calls lookup? */
244 /* mutex_lock(&inode->i_sb->s_vfs_rename_mutex);*/
245 full_path
= build_path_from_dentry(direntry
);
246 /* mutex_unlock(&inode->i_sb->s_vfs_rename_mutex);*/
248 if (full_path
== NULL
) {
254 ("Full path: %s inode = 0x%p pBuffer = 0x%p buflen = %d",
255 full_path
, inode
, pBuffer
, buflen
));
256 if (buflen
> PATH_MAX
)
260 tmpbuffer
= kmalloc(len
, GFP_KERNEL
);
261 if (tmpbuffer
== NULL
) {
267 /* BB add read reparse point symlink code and
268 Unix extensions symlink code here BB */
269 if (cifs_sb
->tcon
->ses
->capabilities
& CAP_UNIX
)
270 rc
= CIFSSMBUnixQuerySymLink(xid
, pTcon
, full_path
,
274 else if (cifs_sb
->mnt_cifs_flags
& CIFS_MOUNT_UNX_EMUL
) {
275 cERROR(1, ("SFU style symlinks not implemented yet"));
276 /* add open and read as in fs/cifs/inode.c */
278 rc
= CIFSSMBOpen(xid
, pTcon
, full_path
, FILE_OPEN
, GENERIC_READ
,
279 OPEN_REPARSE_POINT
, &fid
, &oplock
, NULL
,
281 cifs_sb
->mnt_cifs_flags
&
282 CIFS_MOUNT_MAP_SPECIAL_CHR
);
284 rc
= CIFSSMBQueryReparseLinkInfo(xid
, pTcon
, full_path
,
289 if (CIFSSMBClose(xid
, pTcon
, fid
)) {
290 cFYI(1,("Error closing junction point (open for ioctl)"));
293 /* Query if DFS Junction */
295 kmalloc(MAX_TREE_SIZE
+ MAX_PATHCONF
+ 1,
298 strncpy(tmp_path
, pTcon
->treeName
,
300 strncat(tmp_path
, full_path
,
302 rc
= get_dfs_path(xid
, pTcon
->ses
,
305 &num_referrals
, &referrals
,
306 cifs_sb
->mnt_cifs_flags
&
307 CIFS_MOUNT_MAP_SPECIAL_CHR
);
308 cFYI(1, ("Get DFS for %s rc = %d ",
310 if ((num_referrals
== 0) && (rc
== 0))
313 cFYI(1, ("num referral: %d",
316 cFYI(1,("referral string: %s", referrals
));
325 /* BB add code like else decode referrals
326 then memcpy to tmpbuffer and free referrals
331 /* BB Anything else to do to handle recursive links? */
332 /* BB Should we be using page ops here? */
334 /* BB null terminate returned string in pBuffer? BB */
336 rc
= vfs_readlink(direntry
, pBuffer
, len
, tmpbuffer
);
338 ("vfs_readlink called from cifs_readlink returned %d",
348 void cifs_put_link(struct dentry
*direntry
, struct nameidata
*nd
, void *cookie
)
350 char *p
= nd_get_link(nd
);