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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/cifs/dir.c | |
3 | * | |
4 | * vfs operations that deal with dentries | |
5fdae1f6 | 5 | * |
c3b2a0c6 | 6 | * Copyright (C) International Business Machines Corp., 2002,2009 |
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 | */ | |
23 | #include <linux/fs.h> | |
24 | #include <linux/stat.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/namei.h> | |
3bc303c2 | 27 | #include <linux/mount.h> |
6ca9f3ba | 28 | #include <linux/file.h> |
1da177e4 LT |
29 | #include "cifsfs.h" |
30 | #include "cifspdu.h" | |
31 | #include "cifsglob.h" | |
32 | #include "cifsproto.h" | |
33 | #include "cifs_debug.h" | |
34 | #include "cifs_fs_sb.h" | |
35 | ||
99ee4dbd | 36 | static void |
1da177e4 LT |
37 | renew_parental_timestamps(struct dentry *direntry) |
38 | { | |
5fdae1f6 SF |
39 | /* BB check if there is a way to get the kernel to do this or if we |
40 | really need this */ | |
1da177e4 LT |
41 | do { |
42 | direntry->d_time = jiffies; | |
43 | direntry = direntry->d_parent; | |
5fdae1f6 | 44 | } while (!IS_ROOT(direntry)); |
1da177e4 LT |
45 | } |
46 | ||
47 | /* Note: caller must free return buffer */ | |
48 | char * | |
49 | build_path_from_dentry(struct dentry *direntry) | |
50 | { | |
51 | struct dentry *temp; | |
2fe87f02 SF |
52 | int namelen; |
53 | int pplen; | |
646dd539 | 54 | int dfsplen; |
1da177e4 | 55 | char *full_path; |
88274815 | 56 | char dirsep; |
0d424ad0 JL |
57 | struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb); |
58 | struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb); | |
1da177e4 | 59 | |
5fdae1f6 | 60 | if (direntry == NULL) |
1da177e4 LT |
61 | return NULL; /* not much we can do if dentry is freed and |
62 | we need to reopen the file after it was closed implicitly | |
63 | when the server crashed */ | |
64 | ||
646dd539 SF |
65 | dirsep = CIFS_DIR_SEP(cifs_sb); |
66 | pplen = cifs_sb->prepathlen; | |
0d424ad0 JL |
67 | if (tcon->Flags & SMB_SHARE_IS_IN_DFS) |
68 | dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1); | |
646dd539 SF |
69 | else |
70 | dfsplen = 0; | |
1da177e4 | 71 | cifs_bp_rename_retry: |
646dd539 | 72 | namelen = pplen + dfsplen; |
1da177e4 LT |
73 | for (temp = direntry; !IS_ROOT(temp);) { |
74 | namelen += (1 + temp->d_name.len); | |
75 | temp = temp->d_parent; | |
5fdae1f6 | 76 | if (temp == NULL) { |
b6b38f70 | 77 | cERROR(1, "corrupt dentry"); |
1da177e4 LT |
78 | return NULL; |
79 | } | |
80 | } | |
81 | ||
82 | full_path = kmalloc(namelen+1, GFP_KERNEL); | |
5fdae1f6 | 83 | if (full_path == NULL) |
1da177e4 LT |
84 | return full_path; |
85 | full_path[namelen] = 0; /* trailing null */ | |
1da177e4 LT |
86 | for (temp = direntry; !IS_ROOT(temp);) { |
87 | namelen -= 1 + temp->d_name.len; | |
88 | if (namelen < 0) { | |
89 | break; | |
90 | } else { | |
7f57356b | 91 | full_path[namelen] = dirsep; |
1da177e4 LT |
92 | strncpy(full_path + namelen + 1, temp->d_name.name, |
93 | temp->d_name.len); | |
b6b38f70 | 94 | cFYI(0, "name: %s", full_path + namelen); |
1da177e4 LT |
95 | } |
96 | temp = temp->d_parent; | |
5fdae1f6 | 97 | if (temp == NULL) { |
b6b38f70 | 98 | cERROR(1, "corrupt dentry"); |
1da177e4 LT |
99 | kfree(full_path); |
100 | return NULL; | |
101 | } | |
102 | } | |
646dd539 | 103 | if (namelen != pplen + dfsplen) { |
b6b38f70 JP |
104 | cERROR(1, "did not end path lookup where expected namelen is %d", |
105 | namelen); | |
5fdae1f6 | 106 | /* presumably this is only possible if racing with a rename |
1da177e4 LT |
107 | of one of the parent directories (we can not lock the dentries |
108 | above us to prevent this, but retrying should be harmless) */ | |
109 | kfree(full_path); | |
1da177e4 LT |
110 | goto cifs_bp_rename_retry; |
111 | } | |
2fe87f02 SF |
112 | /* DIR_SEP already set for byte 0 / vs \ but not for |
113 | subsequent slashes in prepath which currently must | |
114 | be entered the right way - not sure if there is an alternative | |
115 | since the '\' is a valid posix character so we can not switch | |
116 | those safely to '/' if any are found in the middle of the prepath */ | |
117 | /* BB test paths to Windows with '/' in the midst of prepath */ | |
646dd539 SF |
118 | |
119 | if (dfsplen) { | |
0d424ad0 | 120 | strncpy(full_path, tcon->treeName, dfsplen); |
646dd539 SF |
121 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) { |
122 | int i; | |
123 | for (i = 0; i < dfsplen; i++) { | |
124 | if (full_path[i] == '\\') | |
125 | full_path[i] = '/'; | |
126 | } | |
127 | } | |
128 | } | |
129 | strncpy(full_path + dfsplen, CIFS_SB(direntry->d_sb)->prepath, pplen); | |
1da177e4 LT |
130 | return full_path; |
131 | } | |
132 | ||
086f68bd | 133 | struct cifsFileInfo * |
f7a40689 | 134 | cifs_new_fileinfo(struct inode *newinode, __u16 fileHandle, struct file *file, |
f6a53460 | 135 | struct tcon_link *tlink, __u32 oplock) |
a6ce4932 | 136 | { |
a5e18bc3 | 137 | struct dentry *dentry = file->f_path.dentry; |
a6ce4932 SF |
138 | struct cifsFileInfo *pCifsFile; |
139 | struct cifsInodeInfo *pCifsInode; | |
140 | ||
141 | pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
a6ce4932 | 142 | if (pCifsFile == NULL) |
086f68bd | 143 | return pCifsFile; |
a6ce4932 | 144 | |
a6ce4932 SF |
145 | pCifsFile->netfid = fileHandle; |
146 | pCifsFile->pid = current->tgid; | |
6508d904 | 147 | pCifsFile->uid = current_fsuid(); |
a5e18bc3 | 148 | pCifsFile->dentry = dget(dentry); |
086f68bd | 149 | pCifsFile->pfile = file; |
a6ce4932 | 150 | pCifsFile->invalidHandle = false; |
bc8cd439 | 151 | pCifsFile->closePend = false; |
13cfb733 | 152 | pCifsFile->tlink = cifs_get_tlink(tlink); |
a6ce4932 SF |
153 | mutex_init(&pCifsFile->fh_mutex); |
154 | mutex_init(&pCifsFile->lock_mutex); | |
155 | INIT_LIST_HEAD(&pCifsFile->llist); | |
6ab409b5 | 156 | atomic_set(&pCifsFile->count, 1); |
9b646972 | 157 | INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break); |
a6ce4932 | 158 | |
a6ce4932 | 159 | write_lock(&GlobalSMBSeslock); |
13cfb733 | 160 | list_add(&pCifsFile->tlist, &(tlink_tcon(tlink)->openFileList)); |
a6ce4932 SF |
161 | pCifsInode = CIFS_I(newinode); |
162 | if (pCifsInode) { | |
163 | /* if readable file instance put first in list*/ | |
f6a53460 | 164 | if (file->f_mode & FMODE_READ) |
086f68bd JL |
165 | list_add(&pCifsFile->flist, &pCifsInode->openFileList); |
166 | else | |
a6ce4932 SF |
167 | list_add_tail(&pCifsFile->flist, |
168 | &pCifsInode->openFileList); | |
bc8cd439 | 169 | |
a6ce4932 SF |
170 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { |
171 | pCifsInode->clientCanCacheAll = true; | |
172 | pCifsInode->clientCanCacheRead = true; | |
b6b38f70 | 173 | cFYI(1, "Exclusive Oplock inode %p", newinode); |
a6ce4932 | 174 | } else if ((oplock & 0xF) == OPLOCK_READ) |
bc8cd439 | 175 | pCifsInode->clientCanCacheRead = true; |
a6ce4932 SF |
176 | } |
177 | write_unlock(&GlobalSMBSeslock); | |
086f68bd | 178 | |
6ca9f3ba JL |
179 | file->private_data = pCifsFile; |
180 | ||
086f68bd | 181 | return pCifsFile; |
a6ce4932 SF |
182 | } |
183 | ||
f818dd55 SF |
184 | static void setup_cifs_dentry(struct cifsTconInfo *tcon, |
185 | struct dentry *direntry, | |
186 | struct inode *newinode) | |
187 | { | |
188 | if (tcon->nocase) | |
189 | direntry->d_op = &cifs_ci_dentry_ops; | |
190 | else | |
191 | direntry->d_op = &cifs_dentry_ops; | |
192 | d_instantiate(direntry, newinode); | |
193 | } | |
194 | ||
3979877e | 195 | /* Inode operations in similar order to how they appear in Linux file fs.h */ |
1da177e4 LT |
196 | |
197 | int | |
198 | cifs_create(struct inode *inode, struct dentry *direntry, int mode, | |
199 | struct nameidata *nd) | |
200 | { | |
201 | int rc = -ENOENT; | |
202 | int xid; | |
67750fb9 | 203 | int create_options = CREATE_NOT_DIR; |
590a3fe0 | 204 | __u32 oplock = 0; |
c3b2a0c6 SF |
205 | int oflags; |
206 | /* | |
207 | * BB below access is probably too much for mknod to request | |
208 | * but we have to do query and setpathinfo so requesting | |
209 | * less could fail (unless we want to request getatr and setatr | |
210 | * permissions (only). At least for POSIX we do not have to | |
211 | * request so much. | |
212 | */ | |
1da177e4 LT |
213 | int desiredAccess = GENERIC_READ | GENERIC_WRITE; |
214 | __u16 fileHandle; | |
215 | struct cifs_sb_info *cifs_sb; | |
7ffec372 | 216 | struct tcon_link *tlink; |
f818dd55 | 217 | struct cifsTconInfo *tcon; |
1da177e4 | 218 | char *full_path = NULL; |
fb8c4b14 | 219 | FILE_ALL_INFO *buf = NULL; |
1da177e4 | 220 | struct inode *newinode = NULL; |
1da177e4 | 221 | int disposition = FILE_OVERWRITE_IF; |
1da177e4 LT |
222 | |
223 | xid = GetXid(); | |
224 | ||
225 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
226 | tlink = cifs_sb_tlink(cifs_sb); |
227 | if (IS_ERR(tlink)) { | |
228 | FreeXid(xid); | |
229 | return PTR_ERR(tlink); | |
1da177e4 | 230 | } |
7ffec372 | 231 | tcon = tlink_tcon(tlink); |
1da177e4 | 232 | |
c3b2a0c6 SF |
233 | if (oplockEnabled) |
234 | oplock = REQ_OPLOCK; | |
f818dd55 | 235 | |
c3b2a0c6 | 236 | if (nd && (nd->flags & LOOKUP_OPEN)) |
608712fe | 237 | oflags = nd->intent.open.file->f_flags; |
c3b2a0c6 | 238 | else |
608712fe | 239 | oflags = O_RDONLY | O_CREAT; |
c3b2a0c6 | 240 | |
7ffec372 JL |
241 | full_path = build_path_from_dentry(direntry); |
242 | if (full_path == NULL) { | |
243 | rc = -ENOMEM; | |
244 | goto cifs_create_out; | |
245 | } | |
246 | ||
c3b2a0c6 SF |
247 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
248 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
249 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
fa588e0c | 250 | rc = cifs_posix_open(full_path, &newinode, |
fa588e0c | 251 | inode->i_sb, mode, oflags, &oplock, &fileHandle, xid); |
c3b2a0c6 SF |
252 | /* EIO could indicate that (posix open) operation is not |
253 | supported, despite what server claimed in capability | |
254 | negotation. EREMOTE indicates DFS junction, which is not | |
255 | handled in posix open */ | |
256 | ||
90e4ee5d | 257 | if (rc == 0) { |
90e4ee5d SF |
258 | if (newinode == NULL) /* query inode info */ |
259 | goto cifs_create_get_file_info; | |
260 | else /* success, no need to query */ | |
261 | goto cifs_create_set_dentry; | |
262 | } else if ((rc != -EIO) && (rc != -EREMOTE) && | |
703a3b8e | 263 | (rc != -EOPNOTSUPP) && (rc != -EINVAL)) |
c3b2a0c6 SF |
264 | goto cifs_create_out; |
265 | /* else fallthrough to retry, using older open call, this is | |
266 | case where server does not support this SMB level, and | |
267 | falsely claims capability (also get here for DFS case | |
268 | which should be rare for path not covered on files) */ | |
269 | } | |
e08fc045 | 270 | |
c3b2a0c6 SF |
271 | if (nd && (nd->flags & LOOKUP_OPEN)) { |
272 | /* if the file is going to stay open, then we | |
273 | need to set the desired access properly */ | |
e08fc045 | 274 | desiredAccess = 0; |
608712fe | 275 | if (OPEN_FMODE(oflags) & FMODE_READ) |
c3b2a0c6 | 276 | desiredAccess |= GENERIC_READ; /* is this too little? */ |
608712fe | 277 | if (OPEN_FMODE(oflags) & FMODE_WRITE) |
e08fc045 | 278 | desiredAccess |= GENERIC_WRITE; |
1da177e4 | 279 | |
5fdae1f6 | 280 | if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) |
1da177e4 | 281 | disposition = FILE_CREATE; |
5fdae1f6 | 282 | else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) |
1da177e4 | 283 | disposition = FILE_OVERWRITE_IF; |
5fdae1f6 | 284 | else if ((oflags & O_CREAT) == O_CREAT) |
1da177e4 | 285 | disposition = FILE_OPEN_IF; |
ad7a2926 | 286 | else |
b6b38f70 | 287 | cFYI(1, "Create flag not set in create function"); |
1da177e4 LT |
288 | } |
289 | ||
5fdae1f6 SF |
290 | /* BB add processing to set equivalent of mode - e.g. via CreateX with |
291 | ACLs */ | |
1da177e4 | 292 | |
5fdae1f6 SF |
293 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); |
294 | if (buf == NULL) { | |
232341ba JL |
295 | rc = -ENOMEM; |
296 | goto cifs_create_out; | |
1da177e4 | 297 | } |
67750fb9 | 298 | |
67750fb9 JL |
299 | /* |
300 | * if we're not using unix extensions, see if we need to set | |
301 | * ATTR_READONLY on the create call | |
302 | */ | |
f818dd55 | 303 | if (!tcon->unix_ext && (mode & S_IWUGO) == 0) |
67750fb9 JL |
304 | create_options |= CREATE_OPTION_READONLY; |
305 | ||
a6e8a845 | 306 | if (tcon->ses->capabilities & CAP_NT_SMBS) |
f818dd55 | 307 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, |
67750fb9 | 308 | desiredAccess, create_options, |
737b758c SF |
309 | &fileHandle, &oplock, buf, cifs_sb->local_nls, |
310 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5bafd765 SF |
311 | else |
312 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
313 | ||
5fdae1f6 | 314 | if (rc == -EIO) { |
a9d02ad4 | 315 | /* old server, retry the open legacy style */ |
f818dd55 | 316 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, |
67750fb9 | 317 | desiredAccess, create_options, |
a9d02ad4 SF |
318 | &fileHandle, &oplock, buf, cifs_sb->local_nls, |
319 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5fdae1f6 | 320 | } |
1da177e4 | 321 | if (rc) { |
b6b38f70 | 322 | cFYI(1, "cifs_create returned 0x%x", rc); |
c3b2a0c6 SF |
323 | goto cifs_create_out; |
324 | } | |
325 | ||
326 | /* If Open reported that we actually created a file | |
327 | then we now have to set the mode if possible */ | |
328 | if ((tcon->unix_ext) && (oplock & CIFS_CREATE_ACTION)) { | |
329 | struct cifs_unix_set_info_args args = { | |
4e1e7fb9 JL |
330 | .mode = mode, |
331 | .ctime = NO_CHANGE_64, | |
332 | .atime = NO_CHANGE_64, | |
333 | .mtime = NO_CHANGE_64, | |
334 | .device = 0, | |
c3b2a0c6 SF |
335 | }; |
336 | ||
337 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) { | |
338 | args.uid = (__u64) current_fsuid(); | |
339 | if (inode->i_mode & S_ISGID) | |
340 | args.gid = (__u64) inode->i_gid; | |
341 | else | |
342 | args.gid = (__u64) current_fsgid(); | |
3ce53fc4 | 343 | } else { |
c3b2a0c6 SF |
344 | args.uid = NO_CHANGE_64; |
345 | args.gid = NO_CHANGE_64; | |
1da177e4 | 346 | } |
01ea95e3 JL |
347 | CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, |
348 | cifs_sb->local_nls, | |
349 | cifs_sb->mnt_cifs_flags & | |
350 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
c3b2a0c6 SF |
351 | } else { |
352 | /* BB implement mode setting via Windows security | |
353 | descriptors e.g. */ | |
354 | /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/ | |
355 | ||
356 | /* Could set r/o dos attribute if mode & 0222 == 0 */ | |
357 | } | |
1da177e4 | 358 | |
c3b2a0c6 SF |
359 | cifs_create_get_file_info: |
360 | /* server might mask mode so we have to query for it */ | |
361 | if (tcon->unix_ext) | |
362 | rc = cifs_get_inode_info_unix(&newinode, full_path, | |
363 | inode->i_sb, xid); | |
364 | else { | |
365 | rc = cifs_get_inode_info(&newinode, full_path, buf, | |
366 | inode->i_sb, xid, &fileHandle); | |
367 | if (newinode) { | |
368 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) | |
369 | newinode->i_mode = mode; | |
370 | if ((oplock & CIFS_CREATE_ACTION) && | |
371 | (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) { | |
372 | newinode->i_uid = current_fsuid(); | |
373 | if (inode->i_mode & S_ISGID) | |
374 | newinode->i_gid = inode->i_gid; | |
375 | else | |
376 | newinode->i_gid = current_fsgid(); | |
6473a559 | 377 | } |
1da177e4 | 378 | } |
c3b2a0c6 | 379 | } |
1da177e4 | 380 | |
c3b2a0c6 SF |
381 | cifs_create_set_dentry: |
382 | if (rc == 0) | |
383 | setup_cifs_dentry(tcon, direntry, newinode); | |
384 | else | |
b6b38f70 | 385 | cFYI(1, "Create worked, get_inode_info failed rc = %d", rc); |
c3b2a0c6 | 386 | |
2422f676 | 387 | if (newinode && nd && (nd->flags & LOOKUP_OPEN)) { |
fdb36038 | 388 | struct cifsFileInfo *pfile_info; |
6ca9f3ba JL |
389 | struct file *filp; |
390 | ||
391 | filp = lookup_instantiate_filp(nd, direntry, generic_file_open); | |
392 | if (IS_ERR(filp)) { | |
393 | rc = PTR_ERR(filp); | |
394 | CIFSSMBClose(xid, tcon, fileHandle); | |
395 | goto cifs_create_out; | |
396 | } | |
397 | ||
398 | pfile_info = cifs_new_fileinfo(newinode, fileHandle, filp, | |
f6a53460 | 399 | tlink, oplock); |
6ca9f3ba JL |
400 | if (pfile_info == NULL) { |
401 | fput(filp); | |
402 | CIFSSMBClose(xid, tcon, fileHandle); | |
fdb36038 | 403 | rc = -ENOMEM; |
6ca9f3ba | 404 | } |
2422f676 JL |
405 | } else { |
406 | CIFSSMBClose(xid, tcon, fileHandle); | |
5fdae1f6 | 407 | } |
2422f676 | 408 | |
d14537f1 SF |
409 | cifs_create_out: |
410 | kfree(buf); | |
411 | kfree(full_path); | |
7ffec372 | 412 | cifs_put_tlink(tlink); |
1da177e4 | 413 | FreeXid(xid); |
1da177e4 LT |
414 | return rc; |
415 | } | |
416 | ||
5fdae1f6 SF |
417 | int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode, |
418 | dev_t device_number) | |
1da177e4 LT |
419 | { |
420 | int rc = -EPERM; | |
421 | int xid; | |
422 | struct cifs_sb_info *cifs_sb; | |
7ffec372 | 423 | struct tcon_link *tlink; |
1da177e4 LT |
424 | struct cifsTconInfo *pTcon; |
425 | char *full_path = NULL; | |
fb8c4b14 | 426 | struct inode *newinode = NULL; |
5d9ac7fd JL |
427 | int oplock = 0; |
428 | u16 fileHandle; | |
429 | FILE_ALL_INFO *buf = NULL; | |
430 | unsigned int bytes_written; | |
431 | struct win_dev *pdev; | |
1da177e4 LT |
432 | |
433 | if (!old_valid_dev(device_number)) | |
434 | return -EINVAL; | |
435 | ||
1da177e4 | 436 | cifs_sb = CIFS_SB(inode->i_sb); |
7ffec372 JL |
437 | tlink = cifs_sb_tlink(cifs_sb); |
438 | if (IS_ERR(tlink)) | |
439 | return PTR_ERR(tlink); | |
440 | ||
441 | pTcon = tlink_tcon(tlink); | |
442 | ||
443 | xid = GetXid(); | |
1da177e4 | 444 | |
1da177e4 | 445 | full_path = build_path_from_dentry(direntry); |
5d9ac7fd | 446 | if (full_path == NULL) { |
1da177e4 | 447 | rc = -ENOMEM; |
5d9ac7fd JL |
448 | goto mknod_out; |
449 | } | |
450 | ||
451 | if (pTcon->unix_ext) { | |
4e1e7fb9 | 452 | struct cifs_unix_set_info_args args = { |
ce3b0f8d | 453 | .mode = mode & ~current_umask(), |
4e1e7fb9 JL |
454 | .ctime = NO_CHANGE_64, |
455 | .atime = NO_CHANGE_64, | |
456 | .mtime = NO_CHANGE_64, | |
457 | .device = device_number, | |
458 | }; | |
5fdae1f6 | 459 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) { |
a001e5b5 DH |
460 | args.uid = (__u64) current_fsuid(); |
461 | args.gid = (__u64) current_fsgid(); | |
1da177e4 | 462 | } else { |
4e1e7fb9 JL |
463 | args.uid = NO_CHANGE_64; |
464 | args.gid = NO_CHANGE_64; | |
1da177e4 | 465 | } |
01ea95e3 JL |
466 | rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args, |
467 | cifs_sb->local_nls, | |
468 | cifs_sb->mnt_cifs_flags & | |
469 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5d9ac7fd JL |
470 | if (rc) |
471 | goto mknod_out; | |
1da177e4 | 472 | |
5d9ac7fd | 473 | rc = cifs_get_inode_info_unix(&newinode, full_path, |
5fdae1f6 | 474 | inode->i_sb, xid); |
5d9ac7fd JL |
475 | if (pTcon->nocase) |
476 | direntry->d_op = &cifs_ci_dentry_ops; | |
477 | else | |
478 | direntry->d_op = &cifs_dentry_ops; | |
eda3c029 | 479 | |
5d9ac7fd JL |
480 | if (rc == 0) |
481 | d_instantiate(direntry, newinode); | |
482 | goto mknod_out; | |
1da177e4 LT |
483 | } |
484 | ||
5d9ac7fd JL |
485 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) |
486 | goto mknod_out; | |
487 | ||
488 | ||
489 | cFYI(1, "sfu compat create special file"); | |
490 | ||
491 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
492 | if (buf == NULL) { | |
493 | kfree(full_path); | |
494 | rc = -ENOMEM; | |
495 | FreeXid(xid); | |
496 | return rc; | |
497 | } | |
498 | ||
499 | /* FIXME: would WRITE_OWNER | WRITE_DAC be better? */ | |
500 | rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_CREATE, | |
501 | GENERIC_WRITE, CREATE_NOT_DIR | CREATE_OPTION_SPECIAL, | |
502 | &fileHandle, &oplock, buf, cifs_sb->local_nls, | |
503 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
504 | if (rc) | |
505 | goto mknod_out; | |
506 | ||
507 | /* BB Do not bother to decode buf since no local inode yet to put | |
508 | * timestamps in, but we can reuse it safely */ | |
509 | ||
510 | pdev = (struct win_dev *)buf; | |
511 | if (S_ISCHR(mode)) { | |
512 | memcpy(pdev->type, "IntxCHR", 8); | |
513 | pdev->major = | |
514 | cpu_to_le64(MAJOR(device_number)); | |
515 | pdev->minor = | |
516 | cpu_to_le64(MINOR(device_number)); | |
517 | rc = CIFSSMBWrite(xid, pTcon, | |
518 | fileHandle, | |
519 | sizeof(struct win_dev), | |
520 | 0, &bytes_written, (char *)pdev, | |
521 | NULL, 0); | |
522 | } else if (S_ISBLK(mode)) { | |
523 | memcpy(pdev->type, "IntxBLK", 8); | |
524 | pdev->major = | |
525 | cpu_to_le64(MAJOR(device_number)); | |
526 | pdev->minor = | |
527 | cpu_to_le64(MINOR(device_number)); | |
528 | rc = CIFSSMBWrite(xid, pTcon, | |
529 | fileHandle, | |
530 | sizeof(struct win_dev), | |
531 | 0, &bytes_written, (char *)pdev, | |
532 | NULL, 0); | |
533 | } /* else if (S_ISFIFO) */ | |
534 | CIFSSMBClose(xid, pTcon, fileHandle); | |
535 | d_drop(direntry); | |
536 | ||
537 | /* FIXME: add code here to set EAs */ | |
538 | ||
539 | mknod_out: | |
d14537f1 | 540 | kfree(full_path); |
5d9ac7fd | 541 | kfree(buf); |
1da177e4 | 542 | FreeXid(xid); |
7ffec372 | 543 | cifs_put_tlink(tlink); |
1da177e4 LT |
544 | return rc; |
545 | } | |
546 | ||
1da177e4 | 547 | struct dentry * |
5fdae1f6 SF |
548 | cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, |
549 | struct nameidata *nd) | |
1da177e4 LT |
550 | { |
551 | int xid; | |
552 | int rc = 0; /* to get around spurious gcc warning, set to zero here */ | |
590a3fe0 | 553 | __u32 oplock = 0; |
a6ce4932 SF |
554 | __u16 fileHandle = 0; |
555 | bool posix_open = false; | |
1da177e4 | 556 | struct cifs_sb_info *cifs_sb; |
7ffec372 | 557 | struct tcon_link *tlink; |
1da177e4 | 558 | struct cifsTconInfo *pTcon; |
2422f676 | 559 | struct cifsFileInfo *cfile; |
1da177e4 LT |
560 | struct inode *newInode = NULL; |
561 | char *full_path = NULL; | |
a6ce4932 | 562 | struct file *filp; |
1da177e4 LT |
563 | |
564 | xid = GetXid(); | |
565 | ||
b6b38f70 JP |
566 | cFYI(1, "parent inode = 0x%p name is: %s and dentry = 0x%p", |
567 | parent_dir_inode, direntry->d_name.name, direntry); | |
1da177e4 | 568 | |
1da177e4 LT |
569 | /* check whether path exists */ |
570 | ||
571 | cifs_sb = CIFS_SB(parent_dir_inode->i_sb); | |
7ffec372 JL |
572 | tlink = cifs_sb_tlink(cifs_sb); |
573 | if (IS_ERR(tlink)) { | |
574 | FreeXid(xid); | |
575 | return (struct dentry *)tlink; | |
576 | } | |
577 | pTcon = tlink_tcon(tlink); | |
1da177e4 | 578 | |
296034f7 SF |
579 | /* |
580 | * Don't allow the separator character in a path component. | |
581 | * The VFS will not allow "/", but "\" is allowed by posix. | |
582 | */ | |
583 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) { | |
584 | int i; | |
585 | for (i = 0; i < direntry->d_name.len; i++) | |
586 | if (direntry->d_name.name[i] == '\\') { | |
b6b38f70 | 587 | cFYI(1, "Invalid file name"); |
7ffec372 JL |
588 | rc = -EINVAL; |
589 | goto lookup_out; | |
296034f7 SF |
590 | } |
591 | } | |
592 | ||
5ddf1e0f JL |
593 | /* |
594 | * O_EXCL: optimize away the lookup, but don't hash the dentry. Let | |
595 | * the VFS handle the create. | |
596 | */ | |
8e6c0332 | 597 | if (nd && (nd->flags & LOOKUP_EXCL)) { |
5ddf1e0f | 598 | d_instantiate(direntry, NULL); |
7ffec372 JL |
599 | rc = 0; |
600 | goto lookup_out; | |
5ddf1e0f JL |
601 | } |
602 | ||
1da177e4 LT |
603 | /* can not grab the rename sem here since it would |
604 | deadlock in the cases (beginning of sys_rename itself) | |
605 | in which we already have the sb rename sem */ | |
606 | full_path = build_path_from_dentry(direntry); | |
5fdae1f6 | 607 | if (full_path == NULL) { |
7ffec372 JL |
608 | rc = -ENOMEM; |
609 | goto lookup_out; | |
1da177e4 LT |
610 | } |
611 | ||
612 | if (direntry->d_inode != NULL) { | |
b6b38f70 | 613 | cFYI(1, "non-NULL inode in lookup"); |
1da177e4 | 614 | } else { |
b6b38f70 | 615 | cFYI(1, "NULL inode in lookup"); |
1da177e4 | 616 | } |
b6b38f70 | 617 | cFYI(1, "Full path: %s inode = 0x%p", full_path, direntry->d_inode); |
1da177e4 | 618 | |
8db14ca1 SF |
619 | /* Posix open is only called (at lookup time) for file create now. |
620 | * For opens (rather than creates), because we do not know if it | |
621 | * is a file or directory yet, and current Samba no longer allows | |
622 | * us to do posix open on dirs, we could end up wasting an open call | |
623 | * on what turns out to be a dir. For file opens, we wait to call posix | |
624 | * open till cifs_open. It could be added here (lookup) in the future | |
625 | * but the performance tradeoff of the extra network request when EISDIR | |
626 | * or EACCES is returned would have to be weighed against the 50% | |
627 | * reduction in network traffic in the other paths. | |
628 | */ | |
a6ce4932 | 629 | if (pTcon->unix_ext) { |
8e6c0332 | 630 | if (nd && !(nd->flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY)) && |
8db14ca1 | 631 | (nd->flags & LOOKUP_OPEN) && !pTcon->broken_posix_open && |
608712fe | 632 | (nd->intent.open.file->f_flags & O_CREAT)) { |
2422f676 | 633 | rc = cifs_posix_open(full_path, &newInode, |
fa588e0c | 634 | parent_dir_inode->i_sb, |
703a3b8e | 635 | nd->intent.open.create_mode, |
608712fe | 636 | nd->intent.open.file->f_flags, &oplock, |
a6ce4932 | 637 | &fileHandle, xid); |
8db14ca1 SF |
638 | /* |
639 | * The check below works around a bug in POSIX | |
640 | * open in samba versions 3.3.1 and earlier where | |
641 | * open could incorrectly fail with invalid parameter. | |
642 | * If either that or op not supported returned, follow | |
643 | * the normal lookup. | |
644 | */ | |
645 | if ((rc == 0) || (rc == -ENOENT)) | |
646 | posix_open = true; | |
647 | else if ((rc == -EINVAL) || (rc != -EOPNOTSUPP)) | |
648 | pTcon->broken_posix_open = true; | |
a6ce4932 SF |
649 | } |
650 | if (!posix_open) | |
651 | rc = cifs_get_inode_info_unix(&newInode, full_path, | |
652 | parent_dir_inode->i_sb, xid); | |
653 | } else | |
1da177e4 | 654 | rc = cifs_get_inode_info(&newInode, full_path, NULL, |
a6ce4932 | 655 | parent_dir_inode->i_sb, xid, NULL); |
1da177e4 LT |
656 | |
657 | if ((rc == 0) && (newInode != NULL)) { | |
b92327fe SF |
658 | if (pTcon->nocase) |
659 | direntry->d_op = &cifs_ci_dentry_ops; | |
660 | else | |
661 | direntry->d_op = &cifs_dentry_ops; | |
1da177e4 | 662 | d_add(direntry, newInode); |
2422f676 | 663 | if (posix_open) { |
6ca9f3ba JL |
664 | filp = lookup_instantiate_filp(nd, direntry, |
665 | generic_file_open); | |
666 | if (IS_ERR(filp)) { | |
667 | rc = PTR_ERR(filp); | |
668 | CIFSSMBClose(xid, pTcon, fileHandle); | |
669 | goto lookup_out; | |
670 | } | |
671 | ||
672 | cfile = cifs_new_fileinfo(newInode, fileHandle, filp, | |
f6a53460 | 673 | tlink, oplock); |
2422f676 | 674 | if (cfile == NULL) { |
6ca9f3ba | 675 | fput(filp); |
2422f676 JL |
676 | CIFSSMBClose(xid, pTcon, fileHandle); |
677 | rc = -ENOMEM; | |
678 | goto lookup_out; | |
679 | } | |
2422f676 | 680 | } |
5fdae1f6 | 681 | /* since paths are not looked up by component - the parent |
3abb9272 | 682 | directories are presumed to be good here */ |
1da177e4 LT |
683 | renew_parental_timestamps(direntry); |
684 | ||
685 | } else if (rc == -ENOENT) { | |
686 | rc = 0; | |
3abb9272 SF |
687 | direntry->d_time = jiffies; |
688 | if (pTcon->nocase) | |
689 | direntry->d_op = &cifs_ci_dentry_ops; | |
690 | else | |
691 | direntry->d_op = &cifs_dentry_ops; | |
1da177e4 | 692 | d_add(direntry, NULL); |
5fdae1f6 SF |
693 | /* if it was once a directory (but how can we tell?) we could do |
694 | shrink_dcache_parent(direntry); */ | |
ed2b9170 | 695 | } else if (rc != -EACCES) { |
b6b38f70 | 696 | cERROR(1, "Unexpected lookup error %d", rc); |
ed2b9170 SF |
697 | /* We special case check for Access Denied - since that |
698 | is a common return code */ | |
1da177e4 LT |
699 | } |
700 | ||
2422f676 | 701 | lookup_out: |
d14537f1 | 702 | kfree(full_path); |
7ffec372 | 703 | cifs_put_tlink(tlink); |
1da177e4 LT |
704 | FreeXid(xid); |
705 | return ERR_PTR(rc); | |
706 | } | |
707 | ||
1da177e4 LT |
708 | static int |
709 | cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd) | |
710 | { | |
711 | int isValid = 1; | |
712 | ||
1da177e4 | 713 | if (direntry->d_inode) { |
df2cf170 | 714 | if (cifs_revalidate_dentry(direntry)) |
1da177e4 | 715 | return 0; |
1da177e4 | 716 | } else { |
b6b38f70 JP |
717 | cFYI(1, "neg dentry 0x%p name = %s", |
718 | direntry, direntry->d_name.name); | |
5fdae1f6 | 719 | if (time_after(jiffies, direntry->d_time + HZ) || |
3abb9272 SF |
720 | !lookupCacheEnabled) { |
721 | d_drop(direntry); | |
722 | isValid = 0; | |
5fdae1f6 | 723 | } |
1da177e4 LT |
724 | } |
725 | ||
1da177e4 LT |
726 | return isValid; |
727 | } | |
728 | ||
729 | /* static int cifs_d_delete(struct dentry *direntry) | |
730 | { | |
731 | int rc = 0; | |
732 | ||
b6b38f70 | 733 | cFYI(1, "In cifs d_delete, name = %s", direntry->d_name.name); |
1da177e4 LT |
734 | |
735 | return rc; | |
736 | } */ | |
737 | ||
4fd03e84 | 738 | const struct dentry_operations cifs_dentry_ops = { |
1da177e4 | 739 | .d_revalidate = cifs_d_revalidate, |
5fdae1f6 | 740 | /* d_delete: cifs_d_delete, */ /* not needed except for debugging */ |
1da177e4 | 741 | }; |
b92327fe SF |
742 | |
743 | static int cifs_ci_hash(struct dentry *dentry, struct qstr *q) | |
744 | { | |
745 | struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls; | |
746 | unsigned long hash; | |
747 | int i; | |
748 | ||
749 | hash = init_name_hash(); | |
750 | for (i = 0; i < q->len; i++) | |
751 | hash = partial_name_hash(nls_tolower(codepage, q->name[i]), | |
752 | hash); | |
753 | q->hash = end_name_hash(hash); | |
754 | ||
755 | return 0; | |
756 | } | |
757 | ||
758 | static int cifs_ci_compare(struct dentry *dentry, struct qstr *a, | |
759 | struct qstr *b) | |
760 | { | |
761 | struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls; | |
762 | ||
763 | if ((a->len == b->len) && | |
764 | (nls_strnicmp(codepage, a->name, b->name, a->len) == 0)) { | |
765 | /* | |
766 | * To preserve case, don't let an existing negative dentry's | |
767 | * case take precedence. If a is not a negative dentry, this | |
768 | * should have no side effects | |
769 | */ | |
c3291637 | 770 | memcpy((void *)a->name, b->name, a->len); |
b92327fe SF |
771 | return 0; |
772 | } | |
773 | return 1; | |
774 | } | |
775 | ||
4fd03e84 | 776 | const struct dentry_operations cifs_ci_dentry_ops = { |
b92327fe SF |
777 | .d_revalidate = cifs_d_revalidate, |
778 | .d_hash = cifs_ci_hash, | |
779 | .d_compare = cifs_ci_compare, | |
780 | }; |