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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> | |
27 | #include "cifsfs.h" | |
28 | #include "cifspdu.h" | |
29 | #include "cifsglob.h" | |
30 | #include "cifsproto.h" | |
31 | #include "cifs_debug.h" | |
32 | #include "cifs_fs_sb.h" | |
33 | ||
99ee4dbd | 34 | static void |
1da177e4 LT |
35 | renew_parental_timestamps(struct dentry *direntry) |
36 | { | |
5fdae1f6 SF |
37 | /* BB check if there is a way to get the kernel to do this or if we |
38 | really need this */ | |
1da177e4 LT |
39 | do { |
40 | direntry->d_time = jiffies; | |
41 | direntry = direntry->d_parent; | |
5fdae1f6 | 42 | } while (!IS_ROOT(direntry)); |
1da177e4 LT |
43 | } |
44 | ||
45 | /* Note: caller must free return buffer */ | |
46 | char * | |
47 | build_path_from_dentry(struct dentry *direntry) | |
48 | { | |
49 | struct dentry *temp; | |
2fe87f02 SF |
50 | int namelen; |
51 | int pplen; | |
646dd539 | 52 | int dfsplen; |
1da177e4 | 53 | char *full_path; |
88274815 | 54 | char dirsep; |
646dd539 | 55 | struct cifs_sb_info *cifs_sb; |
1da177e4 | 56 | |
5fdae1f6 | 57 | if (direntry == NULL) |
1da177e4 LT |
58 | return NULL; /* not much we can do if dentry is freed and |
59 | we need to reopen the file after it was closed implicitly | |
60 | when the server crashed */ | |
61 | ||
646dd539 SF |
62 | cifs_sb = CIFS_SB(direntry->d_sb); |
63 | dirsep = CIFS_DIR_SEP(cifs_sb); | |
64 | pplen = cifs_sb->prepathlen; | |
65 | if (cifs_sb->tcon && (cifs_sb->tcon->Flags & SMB_SHARE_IS_IN_DFS)) | |
66 | dfsplen = strnlen(cifs_sb->tcon->treeName, MAX_TREE_SIZE + 1); | |
67 | else | |
68 | dfsplen = 0; | |
1da177e4 | 69 | cifs_bp_rename_retry: |
646dd539 | 70 | namelen = pplen + dfsplen; |
1da177e4 LT |
71 | for (temp = direntry; !IS_ROOT(temp);) { |
72 | namelen += (1 + temp->d_name.len); | |
73 | temp = temp->d_parent; | |
5fdae1f6 SF |
74 | if (temp == NULL) { |
75 | cERROR(1, ("corrupt dentry")); | |
1da177e4 LT |
76 | return NULL; |
77 | } | |
78 | } | |
79 | ||
80 | full_path = kmalloc(namelen+1, GFP_KERNEL); | |
5fdae1f6 | 81 | if (full_path == NULL) |
1da177e4 LT |
82 | return full_path; |
83 | full_path[namelen] = 0; /* trailing null */ | |
1da177e4 LT |
84 | for (temp = direntry; !IS_ROOT(temp);) { |
85 | namelen -= 1 + temp->d_name.len; | |
86 | if (namelen < 0) { | |
87 | break; | |
88 | } else { | |
7f57356b | 89 | full_path[namelen] = dirsep; |
1da177e4 LT |
90 | strncpy(full_path + namelen + 1, temp->d_name.name, |
91 | temp->d_name.len); | |
2fe87f02 | 92 | cFYI(0, ("name: %s", full_path + namelen)); |
1da177e4 LT |
93 | } |
94 | temp = temp->d_parent; | |
5fdae1f6 SF |
95 | if (temp == NULL) { |
96 | cERROR(1, ("corrupt dentry")); | |
1da177e4 LT |
97 | kfree(full_path); |
98 | return NULL; | |
99 | } | |
100 | } | |
646dd539 | 101 | if (namelen != pplen + dfsplen) { |
1da177e4 | 102 | cERROR(1, |
2fe87f02 | 103 | ("did not end path lookup where expected namelen is %d", |
1da177e4 | 104 | namelen)); |
5fdae1f6 | 105 | /* presumably this is only possible if racing with a rename |
1da177e4 LT |
106 | of one of the parent directories (we can not lock the dentries |
107 | above us to prevent this, but retrying should be harmless) */ | |
108 | kfree(full_path); | |
1da177e4 LT |
109 | goto cifs_bp_rename_retry; |
110 | } | |
2fe87f02 SF |
111 | /* DIR_SEP already set for byte 0 / vs \ but not for |
112 | subsequent slashes in prepath which currently must | |
113 | be entered the right way - not sure if there is an alternative | |
114 | since the '\' is a valid posix character so we can not switch | |
115 | those safely to '/' if any are found in the middle of the prepath */ | |
116 | /* BB test paths to Windows with '/' in the midst of prepath */ | |
646dd539 SF |
117 | |
118 | if (dfsplen) { | |
119 | strncpy(full_path, cifs_sb->tcon->treeName, dfsplen); | |
120 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) { | |
121 | int i; | |
122 | for (i = 0; i < dfsplen; i++) { | |
123 | if (full_path[i] == '\\') | |
124 | full_path[i] = '/'; | |
125 | } | |
126 | } | |
127 | } | |
128 | strncpy(full_path + dfsplen, CIFS_SB(direntry->d_sb)->prepath, pplen); | |
1da177e4 LT |
129 | return full_path; |
130 | } | |
131 | ||
7fc8f4e9 | 132 | int cifs_posix_open(char *full_path, struct inode **pinode, |
c3b2a0c6 SF |
133 | struct super_block *sb, int mode, int oflags, |
134 | int *poplock, __u16 *pnetfid, int xid) | |
135 | { | |
136 | int rc; | |
137 | __u32 oplock; | |
138 | FILE_UNIX_BASIC_INFO *presp_data; | |
139 | __u32 posix_flags = 0; | |
140 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
141 | ||
142 | cFYI(1, ("posix open %s", full_path)); | |
143 | ||
144 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); | |
145 | if (presp_data == NULL) | |
146 | return -ENOMEM; | |
147 | ||
148 | /* So far cifs posix extensions can only map the following flags. | |
149 | There are other valid fmode oflags such as FMODE_LSEEK, FMODE_PREAD, but | |
150 | so far we do not seem to need them, and we can treat them as local only */ | |
151 | if ((oflags & (FMODE_READ | FMODE_WRITE)) == | |
152 | (FMODE_READ | FMODE_WRITE)) | |
153 | posix_flags = SMB_O_RDWR; | |
154 | else if (oflags & FMODE_READ) | |
155 | posix_flags = SMB_O_RDONLY; | |
156 | else if (oflags & FMODE_WRITE) | |
157 | posix_flags = SMB_O_WRONLY; | |
158 | if (oflags & O_CREAT) | |
159 | posix_flags |= SMB_O_CREAT; | |
160 | if (oflags & O_EXCL) | |
161 | posix_flags |= SMB_O_EXCL; | |
162 | if (oflags & O_TRUNC) | |
163 | posix_flags |= SMB_O_TRUNC; | |
164 | if (oflags & O_APPEND) | |
165 | posix_flags |= SMB_O_APPEND; | |
166 | if (oflags & O_SYNC) | |
167 | posix_flags |= SMB_O_SYNC; | |
168 | if (oflags & O_DIRECTORY) | |
169 | posix_flags |= SMB_O_DIRECTORY; | |
170 | if (oflags & O_NOFOLLOW) | |
171 | posix_flags |= SMB_O_NOFOLLOW; | |
172 | if (oflags & O_DIRECT) | |
173 | posix_flags |= SMB_O_DIRECT; | |
174 | ||
175 | ||
176 | rc = CIFSPOSIXCreate(xid, cifs_sb->tcon, posix_flags, mode, | |
177 | pnetfid, presp_data, &oplock, full_path, | |
178 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & | |
179 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
180 | if (rc) | |
181 | goto posix_open_ret; | |
182 | ||
183 | if (presp_data->Type == cpu_to_le32(-1)) | |
184 | goto posix_open_ret; /* open ok, caller does qpathinfo */ | |
185 | ||
186 | /* get new inode and set it up */ | |
187 | if (!pinode) | |
188 | goto posix_open_ret; /* caller does not need info */ | |
189 | ||
7fc8f4e9 SF |
190 | if (*pinode == NULL) |
191 | *pinode = cifs_new_inode(sb, &presp_data->UniqueId); | |
192 | /* else an inode was passed in. Update its info, don't create one */ | |
c3b2a0c6 SF |
193 | |
194 | /* We do not need to close the file if new_inode fails since | |
195 | the caller will retry qpathinfo as long as inode is null */ | |
196 | if (*pinode == NULL) | |
197 | goto posix_open_ret; | |
198 | ||
199 | posix_fill_in_inode(*pinode, presp_data, 1); | |
200 | ||
201 | posix_open_ret: | |
202 | kfree(presp_data); | |
203 | return rc; | |
204 | } | |
205 | ||
f818dd55 SF |
206 | static void setup_cifs_dentry(struct cifsTconInfo *tcon, |
207 | struct dentry *direntry, | |
208 | struct inode *newinode) | |
209 | { | |
210 | if (tcon->nocase) | |
211 | direntry->d_op = &cifs_ci_dentry_ops; | |
212 | else | |
213 | direntry->d_op = &cifs_dentry_ops; | |
214 | d_instantiate(direntry, newinode); | |
215 | } | |
216 | ||
3979877e | 217 | /* Inode operations in similar order to how they appear in Linux file fs.h */ |
1da177e4 LT |
218 | |
219 | int | |
220 | cifs_create(struct inode *inode, struct dentry *direntry, int mode, | |
221 | struct nameidata *nd) | |
222 | { | |
223 | int rc = -ENOENT; | |
224 | int xid; | |
67750fb9 | 225 | int create_options = CREATE_NOT_DIR; |
1da177e4 | 226 | int oplock = 0; |
c3b2a0c6 SF |
227 | int oflags; |
228 | /* | |
229 | * BB below access is probably too much for mknod to request | |
230 | * but we have to do query and setpathinfo so requesting | |
231 | * less could fail (unless we want to request getatr and setatr | |
232 | * permissions (only). At least for POSIX we do not have to | |
233 | * request so much. | |
234 | */ | |
1da177e4 LT |
235 | int desiredAccess = GENERIC_READ | GENERIC_WRITE; |
236 | __u16 fileHandle; | |
237 | struct cifs_sb_info *cifs_sb; | |
f818dd55 | 238 | struct cifsTconInfo *tcon; |
1da177e4 | 239 | char *full_path = NULL; |
fb8c4b14 | 240 | FILE_ALL_INFO *buf = NULL; |
1da177e4 | 241 | struct inode *newinode = NULL; |
fb8c4b14 | 242 | struct cifsInodeInfo *pCifsInode; |
1da177e4 | 243 | int disposition = FILE_OVERWRITE_IF; |
4b18f2a9 | 244 | bool write_only = false; |
1da177e4 LT |
245 | |
246 | xid = GetXid(); | |
247 | ||
248 | cifs_sb = CIFS_SB(inode->i_sb); | |
f818dd55 | 249 | tcon = cifs_sb->tcon; |
1da177e4 | 250 | |
1da177e4 | 251 | full_path = build_path_from_dentry(direntry); |
5fdae1f6 | 252 | if (full_path == NULL) { |
1da177e4 LT |
253 | FreeXid(xid); |
254 | return -ENOMEM; | |
255 | } | |
256 | ||
f818dd55 | 257 | mode &= ~current->fs->umask; |
c3b2a0c6 SF |
258 | if (oplockEnabled) |
259 | oplock = REQ_OPLOCK; | |
f818dd55 | 260 | |
c3b2a0c6 SF |
261 | if (nd && (nd->flags & LOOKUP_OPEN)) |
262 | oflags = nd->intent.open.flags; | |
263 | else | |
264 | oflags = FMODE_READ; | |
265 | ||
266 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && | |
267 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
268 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
269 | rc = cifs_posix_open(full_path, &newinode, inode->i_sb, | |
270 | mode, oflags, &oplock, &fileHandle, xid); | |
271 | /* EIO could indicate that (posix open) operation is not | |
272 | supported, despite what server claimed in capability | |
273 | negotation. EREMOTE indicates DFS junction, which is not | |
274 | handled in posix open */ | |
275 | ||
276 | if ((rc == 0) && (newinode == NULL)) | |
277 | goto cifs_create_get_file_info; /* query inode info */ | |
278 | else if (rc == 0) /* success, no need to query */ | |
279 | goto cifs_create_set_dentry; | |
280 | else if ((rc != -EIO) && (rc != -EREMOTE) && | |
281 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
282 | goto cifs_create_out; | |
283 | /* else fallthrough to retry, using older open call, this is | |
284 | case where server does not support this SMB level, and | |
285 | falsely claims capability (also get here for DFS case | |
286 | which should be rare for path not covered on files) */ | |
287 | } | |
e08fc045 | 288 | |
c3b2a0c6 SF |
289 | if (nd && (nd->flags & LOOKUP_OPEN)) { |
290 | /* if the file is going to stay open, then we | |
291 | need to set the desired access properly */ | |
e08fc045 MS |
292 | desiredAccess = 0; |
293 | if (oflags & FMODE_READ) | |
c3b2a0c6 | 294 | desiredAccess |= GENERIC_READ; /* is this too little? */ |
e08fc045 MS |
295 | if (oflags & FMODE_WRITE) { |
296 | desiredAccess |= GENERIC_WRITE; | |
297 | if (!(oflags & FMODE_READ)) | |
4b18f2a9 | 298 | write_only = true; |
1da177e4 LT |
299 | } |
300 | ||
5fdae1f6 | 301 | if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) |
1da177e4 | 302 | disposition = FILE_CREATE; |
5fdae1f6 | 303 | else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) |
1da177e4 | 304 | disposition = FILE_OVERWRITE_IF; |
5fdae1f6 | 305 | else if ((oflags & O_CREAT) == O_CREAT) |
1da177e4 | 306 | disposition = FILE_OPEN_IF; |
ad7a2926 | 307 | else |
5fdae1f6 | 308 | cFYI(1, ("Create flag not set in create function")); |
1da177e4 LT |
309 | } |
310 | ||
5fdae1f6 SF |
311 | /* BB add processing to set equivalent of mode - e.g. via CreateX with |
312 | ACLs */ | |
1da177e4 | 313 | |
5fdae1f6 SF |
314 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); |
315 | if (buf == NULL) { | |
1da177e4 LT |
316 | kfree(full_path); |
317 | FreeXid(xid); | |
318 | return -ENOMEM; | |
319 | } | |
67750fb9 | 320 | |
67750fb9 JL |
321 | /* |
322 | * if we're not using unix extensions, see if we need to set | |
323 | * ATTR_READONLY on the create call | |
324 | */ | |
f818dd55 | 325 | if (!tcon->unix_ext && (mode & S_IWUGO) == 0) |
67750fb9 JL |
326 | create_options |= CREATE_OPTION_READONLY; |
327 | ||
5fdae1f6 | 328 | if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS) |
f818dd55 | 329 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, |
67750fb9 | 330 | desiredAccess, create_options, |
737b758c SF |
331 | &fileHandle, &oplock, buf, cifs_sb->local_nls, |
332 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5bafd765 SF |
333 | else |
334 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
335 | ||
5fdae1f6 | 336 | if (rc == -EIO) { |
a9d02ad4 | 337 | /* old server, retry the open legacy style */ |
f818dd55 | 338 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, |
67750fb9 | 339 | desiredAccess, create_options, |
a9d02ad4 SF |
340 | &fileHandle, &oplock, buf, cifs_sb->local_nls, |
341 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5fdae1f6 | 342 | } |
1da177e4 | 343 | if (rc) { |
26a21b98 | 344 | cFYI(1, ("cifs_create returned 0x%x", rc)); |
c3b2a0c6 SF |
345 | goto cifs_create_out; |
346 | } | |
347 | ||
348 | /* If Open reported that we actually created a file | |
349 | then we now have to set the mode if possible */ | |
350 | if ((tcon->unix_ext) && (oplock & CIFS_CREATE_ACTION)) { | |
351 | struct cifs_unix_set_info_args args = { | |
4e1e7fb9 JL |
352 | .mode = mode, |
353 | .ctime = NO_CHANGE_64, | |
354 | .atime = NO_CHANGE_64, | |
355 | .mtime = NO_CHANGE_64, | |
356 | .device = 0, | |
c3b2a0c6 SF |
357 | }; |
358 | ||
359 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) { | |
360 | args.uid = (__u64) current_fsuid(); | |
361 | if (inode->i_mode & S_ISGID) | |
362 | args.gid = (__u64) inode->i_gid; | |
363 | else | |
364 | args.gid = (__u64) current_fsgid(); | |
3ce53fc4 | 365 | } else { |
c3b2a0c6 SF |
366 | args.uid = NO_CHANGE_64; |
367 | args.gid = NO_CHANGE_64; | |
1da177e4 | 368 | } |
c3b2a0c6 SF |
369 | CIFSSMBUnixSetInfo(xid, tcon, full_path, &args, |
370 | cifs_sb->local_nls, | |
371 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
372 | } else { | |
373 | /* BB implement mode setting via Windows security | |
374 | descriptors e.g. */ | |
375 | /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/ | |
376 | ||
377 | /* Could set r/o dos attribute if mode & 0222 == 0 */ | |
378 | } | |
1da177e4 | 379 | |
c3b2a0c6 SF |
380 | cifs_create_get_file_info: |
381 | /* server might mask mode so we have to query for it */ | |
382 | if (tcon->unix_ext) | |
383 | rc = cifs_get_inode_info_unix(&newinode, full_path, | |
384 | inode->i_sb, xid); | |
385 | else { | |
386 | rc = cifs_get_inode_info(&newinode, full_path, buf, | |
387 | inode->i_sb, xid, &fileHandle); | |
388 | if (newinode) { | |
389 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) | |
390 | newinode->i_mode = mode; | |
391 | if ((oplock & CIFS_CREATE_ACTION) && | |
392 | (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) { | |
393 | newinode->i_uid = current_fsuid(); | |
394 | if (inode->i_mode & S_ISGID) | |
395 | newinode->i_gid = inode->i_gid; | |
396 | else | |
397 | newinode->i_gid = current_fsgid(); | |
6473a559 | 398 | } |
1da177e4 | 399 | } |
c3b2a0c6 | 400 | } |
1da177e4 | 401 | |
c3b2a0c6 SF |
402 | cifs_create_set_dentry: |
403 | if (rc == 0) | |
404 | setup_cifs_dentry(tcon, direntry, newinode); | |
405 | else | |
406 | cFYI(1, ("Create worked, get_inode_info failed rc = %d", rc)); | |
407 | ||
408 | /* nfsd case - nfs srv does not set nd */ | |
409 | if ((nd == NULL) || (!(nd->flags & LOOKUP_OPEN))) { | |
410 | /* mknod case - do not leave file open */ | |
411 | CIFSSMBClose(xid, tcon, fileHandle); | |
412 | } else if (newinode) { | |
413 | struct cifsFileInfo *pCifsFile = | |
414 | kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
415 | ||
416 | if (pCifsFile == NULL) | |
417 | goto cifs_create_out; | |
418 | pCifsFile->netfid = fileHandle; | |
419 | pCifsFile->pid = current->tgid; | |
420 | pCifsFile->pInode = newinode; | |
421 | pCifsFile->invalidHandle = false; | |
422 | pCifsFile->closePend = false; | |
423 | init_MUTEX(&pCifsFile->fh_sem); | |
424 | mutex_init(&pCifsFile->lock_mutex); | |
425 | INIT_LIST_HEAD(&pCifsFile->llist); | |
426 | atomic_set(&pCifsFile->wrtPending, 0); | |
427 | ||
428 | /* set the following in open now | |
d14537f1 | 429 | pCifsFile->pfile = file; */ |
c3b2a0c6 SF |
430 | write_lock(&GlobalSMBSeslock); |
431 | list_add(&pCifsFile->tlist, &tcon->openFileList); | |
432 | pCifsInode = CIFS_I(newinode); | |
433 | if (pCifsInode) { | |
434 | /* if readable file instance put first in list*/ | |
435 | if (write_only) { | |
436 | list_add_tail(&pCifsFile->flist, | |
437 | &pCifsInode->openFileList); | |
438 | } else { | |
439 | list_add(&pCifsFile->flist, | |
440 | &pCifsInode->openFileList); | |
1da177e4 | 441 | } |
c3b2a0c6 SF |
442 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { |
443 | pCifsInode->clientCanCacheAll = true; | |
444 | pCifsInode->clientCanCacheRead = true; | |
445 | cFYI(1, ("Exclusive Oplock inode %p", | |
446 | newinode)); | |
447 | } else if ((oplock & 0xF) == OPLOCK_READ) | |
448 | pCifsInode->clientCanCacheRead = true; | |
1da177e4 | 449 | } |
c3b2a0c6 | 450 | write_unlock(&GlobalSMBSeslock); |
5fdae1f6 | 451 | } |
d14537f1 SF |
452 | cifs_create_out: |
453 | kfree(buf); | |
454 | kfree(full_path); | |
1da177e4 | 455 | FreeXid(xid); |
1da177e4 LT |
456 | return rc; |
457 | } | |
458 | ||
5fdae1f6 SF |
459 | int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode, |
460 | dev_t device_number) | |
1da177e4 LT |
461 | { |
462 | int rc = -EPERM; | |
463 | int xid; | |
464 | struct cifs_sb_info *cifs_sb; | |
465 | struct cifsTconInfo *pTcon; | |
466 | char *full_path = NULL; | |
fb8c4b14 | 467 | struct inode *newinode = NULL; |
1da177e4 LT |
468 | |
469 | if (!old_valid_dev(device_number)) | |
470 | return -EINVAL; | |
471 | ||
472 | xid = GetXid(); | |
473 | ||
474 | cifs_sb = CIFS_SB(inode->i_sb); | |
475 | pTcon = cifs_sb->tcon; | |
476 | ||
1da177e4 | 477 | full_path = build_path_from_dentry(direntry); |
5fdae1f6 | 478 | if (full_path == NULL) |
1da177e4 | 479 | rc = -ENOMEM; |
c18c842b | 480 | else if (pTcon->unix_ext) { |
4e1e7fb9 JL |
481 | struct cifs_unix_set_info_args args = { |
482 | .mode = mode & ~current->fs->umask, | |
483 | .ctime = NO_CHANGE_64, | |
484 | .atime = NO_CHANGE_64, | |
485 | .mtime = NO_CHANGE_64, | |
486 | .device = device_number, | |
487 | }; | |
5fdae1f6 | 488 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) { |
a001e5b5 DH |
489 | args.uid = (__u64) current_fsuid(); |
490 | args.gid = (__u64) current_fsgid(); | |
1da177e4 | 491 | } else { |
4e1e7fb9 JL |
492 | args.uid = NO_CHANGE_64; |
493 | args.gid = NO_CHANGE_64; | |
1da177e4 | 494 | } |
4e1e7fb9 JL |
495 | rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path, |
496 | &args, cifs_sb->local_nls, | |
497 | cifs_sb->mnt_cifs_flags & | |
498 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
1da177e4 | 499 | |
5fdae1f6 | 500 | if (!rc) { |
1da177e4 | 501 | rc = cifs_get_inode_info_unix(&newinode, full_path, |
5fdae1f6 | 502 | inode->i_sb, xid); |
b92327fe SF |
503 | if (pTcon->nocase) |
504 | direntry->d_op = &cifs_ci_dentry_ops; | |
505 | else | |
506 | direntry->d_op = &cifs_dentry_ops; | |
5fdae1f6 | 507 | if (rc == 0) |
1da177e4 LT |
508 | d_instantiate(direntry, newinode); |
509 | } | |
d7245c2c | 510 | } else { |
5fdae1f6 | 511 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) { |
eda3c029 SF |
512 | int oplock = 0; |
513 | u16 fileHandle; | |
ad7a2926 | 514 | FILE_ALL_INFO *buf; |
d7245c2c | 515 | |
5fdae1f6 | 516 | cFYI(1, ("sfu compat create special file")); |
d7245c2c | 517 | |
5fdae1f6 SF |
518 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); |
519 | if (buf == NULL) { | |
eda3c029 SF |
520 | kfree(full_path); |
521 | FreeXid(xid); | |
522 | return -ENOMEM; | |
523 | } | |
524 | ||
525 | rc = CIFSSMBOpen(xid, pTcon, full_path, | |
526 | FILE_CREATE, /* fail if exists */ | |
5fdae1f6 | 527 | GENERIC_WRITE /* BB would |
eda3c029 SF |
528 | WRITE_OWNER | WRITE_DAC be better? */, |
529 | /* Create a file and set the | |
530 | file attribute to SYSTEM */ | |
531 | CREATE_NOT_DIR | CREATE_OPTION_SPECIAL, | |
532 | &fileHandle, &oplock, buf, | |
533 | cifs_sb->local_nls, | |
5fdae1f6 | 534 | cifs_sb->mnt_cifs_flags & |
eda3c029 SF |
535 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
536 | ||
5bafd765 SF |
537 | /* BB FIXME - add handling for backlevel servers |
538 | which need legacy open and check for all | |
5fdae1f6 SF |
539 | calls to SMBOpen for fallback to SMBLeagcyOpen */ |
540 | if (!rc) { | |
eda3c029 | 541 | /* BB Do not bother to decode buf since no |
86c96b4b SF |
542 | local inode yet to put timestamps in, |
543 | but we can reuse it safely */ | |
77159b4d | 544 | unsigned int bytes_written; |
86c96b4b SF |
545 | struct win_dev *pdev; |
546 | pdev = (struct win_dev *)buf; | |
5fdae1f6 | 547 | if (S_ISCHR(mode)) { |
86c96b4b SF |
548 | memcpy(pdev->type, "IntxCHR", 8); |
549 | pdev->major = | |
550 | cpu_to_le64(MAJOR(device_number)); | |
5fdae1f6 | 551 | pdev->minor = |
86c96b4b SF |
552 | cpu_to_le64(MINOR(device_number)); |
553 | rc = CIFSSMBWrite(xid, pTcon, | |
554 | fileHandle, | |
555 | sizeof(struct win_dev), | |
556 | 0, &bytes_written, (char *)pdev, | |
557 | NULL, 0); | |
5fdae1f6 | 558 | } else if (S_ISBLK(mode)) { |
86c96b4b SF |
559 | memcpy(pdev->type, "IntxBLK", 8); |
560 | pdev->major = | |
561 | cpu_to_le64(MAJOR(device_number)); | |
562 | pdev->minor = | |
563 | cpu_to_le64(MINOR(device_number)); | |
564 | rc = CIFSSMBWrite(xid, pTcon, | |
565 | fileHandle, | |
566 | sizeof(struct win_dev), | |
567 | 0, &bytes_written, (char *)pdev, | |
568 | NULL, 0); | |
569 | } /* else if(S_ISFIFO */ | |
eda3c029 SF |
570 | CIFSSMBClose(xid, pTcon, fileHandle); |
571 | d_drop(direntry); | |
572 | } | |
573 | kfree(buf); | |
d7245c2c SF |
574 | /* add code here to set EAs */ |
575 | } | |
1da177e4 LT |
576 | } |
577 | ||
d14537f1 | 578 | kfree(full_path); |
1da177e4 | 579 | FreeXid(xid); |
1da177e4 LT |
580 | return rc; |
581 | } | |
582 | ||
583 | ||
584 | struct dentry * | |
5fdae1f6 SF |
585 | cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, |
586 | struct nameidata *nd) | |
1da177e4 LT |
587 | { |
588 | int xid; | |
589 | int rc = 0; /* to get around spurious gcc warning, set to zero here */ | |
590 | struct cifs_sb_info *cifs_sb; | |
591 | struct cifsTconInfo *pTcon; | |
592 | struct inode *newInode = NULL; | |
593 | char *full_path = NULL; | |
594 | ||
595 | xid = GetXid(); | |
596 | ||
61e74801 | 597 | cFYI(1, ("parent inode = 0x%p name is: %s and dentry = 0x%p", |
1da177e4 LT |
598 | parent_dir_inode, direntry->d_name.name, direntry)); |
599 | ||
1da177e4 LT |
600 | /* check whether path exists */ |
601 | ||
602 | cifs_sb = CIFS_SB(parent_dir_inode->i_sb); | |
603 | pTcon = cifs_sb->tcon; | |
604 | ||
296034f7 SF |
605 | /* |
606 | * Don't allow the separator character in a path component. | |
607 | * The VFS will not allow "/", but "\" is allowed by posix. | |
608 | */ | |
609 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) { | |
610 | int i; | |
611 | for (i = 0; i < direntry->d_name.len; i++) | |
612 | if (direntry->d_name.name[i] == '\\') { | |
613 | cFYI(1, ("Invalid file name")); | |
614 | FreeXid(xid); | |
615 | return ERR_PTR(-EINVAL); | |
616 | } | |
617 | } | |
618 | ||
1da177e4 LT |
619 | /* can not grab the rename sem here since it would |
620 | deadlock in the cases (beginning of sys_rename itself) | |
621 | in which we already have the sb rename sem */ | |
622 | full_path = build_path_from_dentry(direntry); | |
5fdae1f6 | 623 | if (full_path == NULL) { |
1da177e4 LT |
624 | FreeXid(xid); |
625 | return ERR_PTR(-ENOMEM); | |
626 | } | |
627 | ||
628 | if (direntry->d_inode != NULL) { | |
61e74801 | 629 | cFYI(1, ("non-NULL inode in lookup")); |
1da177e4 | 630 | } else { |
61e74801 | 631 | cFYI(1, ("NULL inode in lookup")); |
1da177e4 | 632 | } |
61e74801 | 633 | cFYI(1, ("Full path: %s inode = 0x%p", full_path, direntry->d_inode)); |
1da177e4 | 634 | |
c18c842b | 635 | if (pTcon->unix_ext) |
1da177e4 | 636 | rc = cifs_get_inode_info_unix(&newInode, full_path, |
5fdae1f6 | 637 | parent_dir_inode->i_sb, xid); |
1da177e4 LT |
638 | else |
639 | rc = cifs_get_inode_info(&newInode, full_path, NULL, | |
8b1327f6 | 640 | parent_dir_inode->i_sb, xid, NULL); |
1da177e4 LT |
641 | |
642 | if ((rc == 0) && (newInode != NULL)) { | |
b92327fe SF |
643 | if (pTcon->nocase) |
644 | direntry->d_op = &cifs_ci_dentry_ops; | |
645 | else | |
646 | direntry->d_op = &cifs_dentry_ops; | |
1da177e4 LT |
647 | d_add(direntry, newInode); |
648 | ||
5fdae1f6 | 649 | /* since paths are not looked up by component - the parent |
3abb9272 | 650 | directories are presumed to be good here */ |
1da177e4 LT |
651 | renew_parental_timestamps(direntry); |
652 | ||
653 | } else if (rc == -ENOENT) { | |
654 | rc = 0; | |
3abb9272 SF |
655 | direntry->d_time = jiffies; |
656 | if (pTcon->nocase) | |
657 | direntry->d_op = &cifs_ci_dentry_ops; | |
658 | else | |
659 | direntry->d_op = &cifs_dentry_ops; | |
1da177e4 | 660 | d_add(direntry, NULL); |
5fdae1f6 SF |
661 | /* if it was once a directory (but how can we tell?) we could do |
662 | shrink_dcache_parent(direntry); */ | |
ed2b9170 SF |
663 | } else if (rc != -EACCES) { |
664 | cERROR(1, ("Unexpected lookup error %d", rc)); | |
665 | /* We special case check for Access Denied - since that | |
666 | is a common return code */ | |
1da177e4 LT |
667 | } |
668 | ||
d14537f1 | 669 | kfree(full_path); |
1da177e4 LT |
670 | FreeXid(xid); |
671 | return ERR_PTR(rc); | |
672 | } | |
673 | ||
1da177e4 LT |
674 | static int |
675 | cifs_d_revalidate(struct dentry *direntry, struct nameidata *nd) | |
676 | { | |
677 | int isValid = 1; | |
678 | ||
1da177e4 | 679 | if (direntry->d_inode) { |
ad7a2926 | 680 | if (cifs_revalidate(direntry)) |
1da177e4 | 681 | return 0; |
1da177e4 | 682 | } else { |
3abb9272 SF |
683 | cFYI(1, ("neg dentry 0x%p name = %s", |
684 | direntry, direntry->d_name.name)); | |
5fdae1f6 | 685 | if (time_after(jiffies, direntry->d_time + HZ) || |
3abb9272 SF |
686 | !lookupCacheEnabled) { |
687 | d_drop(direntry); | |
688 | isValid = 0; | |
5fdae1f6 | 689 | } |
1da177e4 LT |
690 | } |
691 | ||
1da177e4 LT |
692 | return isValid; |
693 | } | |
694 | ||
695 | /* static int cifs_d_delete(struct dentry *direntry) | |
696 | { | |
697 | int rc = 0; | |
698 | ||
699 | cFYI(1, ("In cifs d_delete, name = %s", direntry->d_name.name)); | |
700 | ||
701 | return rc; | |
702 | } */ | |
703 | ||
4fd03e84 | 704 | const struct dentry_operations cifs_dentry_ops = { |
1da177e4 | 705 | .d_revalidate = cifs_d_revalidate, |
5fdae1f6 | 706 | /* d_delete: cifs_d_delete, */ /* not needed except for debugging */ |
1da177e4 | 707 | }; |
b92327fe SF |
708 | |
709 | static int cifs_ci_hash(struct dentry *dentry, struct qstr *q) | |
710 | { | |
711 | struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls; | |
712 | unsigned long hash; | |
713 | int i; | |
714 | ||
715 | hash = init_name_hash(); | |
716 | for (i = 0; i < q->len; i++) | |
717 | hash = partial_name_hash(nls_tolower(codepage, q->name[i]), | |
718 | hash); | |
719 | q->hash = end_name_hash(hash); | |
720 | ||
721 | return 0; | |
722 | } | |
723 | ||
724 | static int cifs_ci_compare(struct dentry *dentry, struct qstr *a, | |
725 | struct qstr *b) | |
726 | { | |
727 | struct nls_table *codepage = CIFS_SB(dentry->d_inode->i_sb)->local_nls; | |
728 | ||
729 | if ((a->len == b->len) && | |
730 | (nls_strnicmp(codepage, a->name, b->name, a->len) == 0)) { | |
731 | /* | |
732 | * To preserve case, don't let an existing negative dentry's | |
733 | * case take precedence. If a is not a negative dentry, this | |
734 | * should have no side effects | |
735 | */ | |
c3291637 | 736 | memcpy((void *)a->name, b->name, a->len); |
b92327fe SF |
737 | return 0; |
738 | } | |
739 | return 1; | |
740 | } | |
741 | ||
4fd03e84 | 742 | const struct dentry_operations cifs_ci_dentry_ops = { |
b92327fe SF |
743 | .d_revalidate = cifs_d_revalidate, |
744 | .d_hash = cifs_ci_hash, | |
745 | .d_compare = cifs_ci_compare, | |
746 | }; |