ACPI: Introduce acpi_get_pci_dev()
[linux-2.6/linux-acpi-2.6.git] / fs / cifs / link.c
blobcd83c53fcbb546f72253dd0306430319db073f6e
1 /*
2 * fs/cifs/link.c
4 * Copyright (C) International Business Machines Corp., 2002,2008
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
21 #include <linux/fs.h>
22 #include <linux/stat.h>
23 #include <linux/namei.h>
24 #include "cifsfs.h"
25 #include "cifspdu.h"
26 #include "cifsglob.h"
27 #include "cifsproto.h"
28 #include "cifs_debug.h"
29 #include "cifs_fs_sb.h"
31 int
32 cifs_hardlink(struct dentry *old_file, struct inode *inode,
33 struct dentry *direntry)
35 int rc = -EACCES;
36 int xid;
37 char *fromName = NULL;
38 char *toName = NULL;
39 struct cifs_sb_info *cifs_sb_target;
40 struct cifsTconInfo *pTcon;
41 struct cifsInodeInfo *cifsInode;
43 xid = GetXid();
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)) {
54 rc = -ENOMEM;
55 goto cifs_hl_exit;
58 /* if (cifs_sb_target->tcon->ses->capabilities & CAP_UNIX)*/
59 if (pTcon->unix_ext)
60 rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName,
61 cifs_sb_target->local_nls,
62 cifs_sb_target->mnt_cifs_flags &
63 CIFS_MOUNT_MAP_SPECIAL_CHR);
64 else {
65 rc = CIFSCreateHardLink(xid, pTcon, fromName, toName,
66 cifs_sb_target->local_nls,
67 cifs_sb_target->mnt_cifs_flags &
68 CIFS_MOUNT_MAP_SPECIAL_CHR);
69 if ((rc == -EIO) || (rc == -EINVAL))
70 rc = -EOPNOTSUPP;
73 d_drop(direntry); /* force new lookup from server of target */
75 /* if source file is cached (oplocked) revalidate will not go to server
76 until the file is closed or oplock broken so update nlinks locally */
77 if (old_file->d_inode) {
78 cifsInode = CIFS_I(old_file->d_inode);
79 if (rc == 0) {
80 old_file->d_inode->i_nlink++;
81 /* BB should we make this contingent on superblock flag NOATIME? */
82 /* old_file->d_inode->i_ctime = CURRENT_TIME;*/
83 /* parent dir timestamps will update from srv
84 within a second, would it really be worth it
85 to set the parent dir cifs inode time to zero
86 to force revalidate (faster) for it too? */
88 /* if not oplocked will force revalidate to get info
89 on source file from srv */
90 cifsInode->time = 0;
92 /* Will update parent dir timestamps from srv within a second.
93 Would it really be worth it to set the parent dir (cifs
94 inode) time field to zero to force revalidate on parent
95 directory faster ie
96 CIFS_I(inode)->time = 0; */
99 cifs_hl_exit:
100 kfree(fromName);
101 kfree(toName);
102 FreeXid(xid);
103 return rc;
106 void *
107 cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
109 struct inode *inode = direntry->d_inode;
110 int rc = -ENOMEM;
111 int xid;
112 char *full_path = NULL;
113 char *target_path = NULL;
114 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
115 struct cifsTconInfo *tcon = cifs_sb->tcon;
117 xid = GetXid();
120 * For now, we just handle symlinks with unix extensions enabled.
121 * Eventually we should handle NTFS reparse points, and MacOS
122 * symlink support. For instance...
124 * rc = CIFSSMBQueryReparseLinkInfo(...)
126 * For now, just return -EACCES when the server doesn't support posix
127 * extensions. Note that we still allow querying symlinks when posix
128 * extensions are manually disabled. We could disable these as well
129 * but there doesn't seem to be any harm in allowing the client to
130 * read them.
132 if (!(tcon->ses->capabilities & CAP_UNIX)) {
133 rc = -EACCES;
134 goto out;
137 full_path = build_path_from_dentry(direntry);
138 if (!full_path)
139 goto out;
141 cFYI(1, ("Full path: %s inode = 0x%p", full_path, inode));
143 rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
144 cifs_sb->local_nls);
145 kfree(full_path);
146 out:
147 if (rc != 0) {
148 kfree(target_path);
149 target_path = ERR_PTR(rc);
152 FreeXid(xid);
153 nd_set_link(nd, target_path);
154 return NULL;
158 cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
160 int rc = -EOPNOTSUPP;
161 int xid;
162 struct cifs_sb_info *cifs_sb;
163 struct cifsTconInfo *pTcon;
164 char *full_path = NULL;
165 struct inode *newinode = NULL;
167 xid = GetXid();
169 cifs_sb = CIFS_SB(inode->i_sb);
170 pTcon = cifs_sb->tcon;
172 full_path = build_path_from_dentry(direntry);
174 if (full_path == NULL) {
175 FreeXid(xid);
176 return -ENOMEM;
179 cFYI(1, ("Full path: %s", full_path));
180 cFYI(1, ("symname is %s", symname));
182 /* BB what if DFS and this volume is on different share? BB */
183 if (pTcon->unix_ext)
184 rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
185 cifs_sb->local_nls);
186 /* else
187 rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,
188 cifs_sb_target->local_nls); */
190 if (rc == 0) {
191 if (pTcon->unix_ext)
192 rc = cifs_get_inode_info_unix(&newinode, full_path,
193 inode->i_sb, xid);
194 else
195 rc = cifs_get_inode_info(&newinode, full_path, NULL,
196 inode->i_sb, xid, NULL);
198 if (rc != 0) {
199 cFYI(1, ("Create symlink ok, getinodeinfo fail rc = %d",
200 rc));
201 } else {
202 if (pTcon->nocase)
203 direntry->d_op = &cifs_ci_dentry_ops;
204 else
205 direntry->d_op = &cifs_dentry_ops;
206 d_instantiate(direntry, newinode);
210 kfree(full_path);
211 FreeXid(xid);
212 return rc;
215 void cifs_put_link(struct dentry *direntry, struct nameidata *nd, void *cookie)
217 char *p = nd_get_link(nd);
218 if (!IS_ERR(p))
219 kfree(p);