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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" | |
ec71e0e1 | 35 | #include "cifs_unicode.h" |
1da177e4 | 36 | |
99ee4dbd | 37 | static void |
1da177e4 LT |
38 | renew_parental_timestamps(struct dentry *direntry) |
39 | { | |
5fdae1f6 SF |
40 | /* BB check if there is a way to get the kernel to do this or if we |
41 | really need this */ | |
1da177e4 | 42 | do { |
a00be0e3 | 43 | cifs_set_time(direntry, jiffies); |
1da177e4 | 44 | direntry = direntry->d_parent; |
5fdae1f6 | 45 | } while (!IS_ROOT(direntry)); |
1da177e4 LT |
46 | } |
47 | ||
6d3ea7e4 SF |
48 | char * |
49 | cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb, | |
374402a2 | 50 | struct cifs_tcon *tcon, int add_treename) |
6d3ea7e4 | 51 | { |
839db3d1 | 52 | int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0; |
6d3ea7e4 SF |
53 | int dfsplen; |
54 | char *full_path = NULL; | |
55 | ||
56 | /* if no prefix path, simply set path to the root of share to "" */ | |
57 | if (pplen == 0) { | |
58 | full_path = kzalloc(1, GFP_KERNEL); | |
59 | return full_path; | |
60 | } | |
61 | ||
374402a2 | 62 | if (add_treename) |
6d3ea7e4 SF |
63 | dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1); |
64 | else | |
65 | dfsplen = 0; | |
66 | ||
67 | full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL); | |
68 | if (full_path == NULL) | |
69 | return full_path; | |
70 | ||
71 | if (dfsplen) | |
340625e6 | 72 | memcpy(full_path, tcon->treeName, dfsplen); |
839db3d1 | 73 | full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb); |
340625e6 | 74 | memcpy(full_path + dfsplen + 1, vol->prepath, pplen); |
6d3ea7e4 | 75 | convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb)); |
6d3ea7e4 SF |
76 | return full_path; |
77 | } | |
78 | ||
1da177e4 LT |
79 | /* Note: caller must free return buffer */ |
80 | char * | |
81 | build_path_from_dentry(struct dentry *direntry) | |
268a635d AA |
82 | { |
83 | struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb); | |
84 | struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); | |
85 | bool prefix = tcon->Flags & SMB_SHARE_IS_IN_DFS; | |
86 | ||
87 | return build_path_from_dentry_optional_prefix(direntry, | |
88 | prefix); | |
89 | } | |
90 | ||
91 | char * | |
92 | build_path_from_dentry_optional_prefix(struct dentry *direntry, bool prefix) | |
1da177e4 LT |
93 | { |
94 | struct dentry *temp; | |
2fe87f02 | 95 | int namelen; |
646dd539 | 96 | int dfsplen; |
a6b5058f | 97 | int pplen = 0; |
1da177e4 | 98 | char *full_path; |
88274815 | 99 | char dirsep; |
0d424ad0 | 100 | struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb); |
96daf2b0 | 101 | struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); |
dc137bf5 | 102 | unsigned seq; |
1da177e4 | 103 | |
646dd539 | 104 | dirsep = CIFS_DIR_SEP(cifs_sb); |
268a635d | 105 | if (prefix) |
0d424ad0 | 106 | dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1); |
646dd539 SF |
107 | else |
108 | dfsplen = 0; | |
a6b5058f AA |
109 | |
110 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) | |
111 | pplen = cifs_sb->prepath ? strlen(cifs_sb->prepath) + 1 : 0; | |
112 | ||
1da177e4 | 113 | cifs_bp_rename_retry: |
a6b5058f | 114 | namelen = dfsplen + pplen; |
dc137bf5 AV |
115 | seq = read_seqbegin(&rename_lock); |
116 | rcu_read_lock(); | |
1da177e4 LT |
117 | for (temp = direntry; !IS_ROOT(temp);) { |
118 | namelen += (1 + temp->d_name.len); | |
119 | temp = temp->d_parent; | |
5fdae1f6 | 120 | if (temp == NULL) { |
f96637be | 121 | cifs_dbg(VFS, "corrupt dentry\n"); |
dc137bf5 | 122 | rcu_read_unlock(); |
1da177e4 LT |
123 | return NULL; |
124 | } | |
125 | } | |
dc137bf5 | 126 | rcu_read_unlock(); |
1da177e4 | 127 | |
8de9e86c | 128 | full_path = kmalloc(namelen+1, GFP_ATOMIC); |
5fdae1f6 | 129 | if (full_path == NULL) |
1da177e4 LT |
130 | return full_path; |
131 | full_path[namelen] = 0; /* trailing null */ | |
dc137bf5 | 132 | rcu_read_lock(); |
1da177e4 | 133 | for (temp = direntry; !IS_ROOT(temp);) { |
dc137bf5 | 134 | spin_lock(&temp->d_lock); |
1da177e4 LT |
135 | namelen -= 1 + temp->d_name.len; |
136 | if (namelen < 0) { | |
dc137bf5 | 137 | spin_unlock(&temp->d_lock); |
1da177e4 LT |
138 | break; |
139 | } else { | |
7f57356b | 140 | full_path[namelen] = dirsep; |
1da177e4 LT |
141 | strncpy(full_path + namelen + 1, temp->d_name.name, |
142 | temp->d_name.len); | |
f96637be | 143 | cifs_dbg(FYI, "name: %s\n", full_path + namelen); |
1da177e4 | 144 | } |
dc137bf5 | 145 | spin_unlock(&temp->d_lock); |
1da177e4 | 146 | temp = temp->d_parent; |
5fdae1f6 | 147 | if (temp == NULL) { |
f96637be | 148 | cifs_dbg(VFS, "corrupt dentry\n"); |
dc137bf5 | 149 | rcu_read_unlock(); |
1da177e4 LT |
150 | kfree(full_path); |
151 | return NULL; | |
152 | } | |
153 | } | |
dc137bf5 | 154 | rcu_read_unlock(); |
a6b5058f | 155 | if (namelen != dfsplen + pplen || read_seqretry(&rename_lock, seq)) { |
f96637be JP |
156 | cifs_dbg(FYI, "did not end path lookup where expected. namelen=%ddfsplen=%d\n", |
157 | namelen, dfsplen); | |
5fdae1f6 | 158 | /* presumably this is only possible if racing with a rename |
1da177e4 LT |
159 | of one of the parent directories (we can not lock the dentries |
160 | above us to prevent this, but retrying should be harmless) */ | |
161 | kfree(full_path); | |
1da177e4 LT |
162 | goto cifs_bp_rename_retry; |
163 | } | |
2fe87f02 SF |
164 | /* DIR_SEP already set for byte 0 / vs \ but not for |
165 | subsequent slashes in prepath which currently must | |
166 | be entered the right way - not sure if there is an alternative | |
167 | since the '\' is a valid posix character so we can not switch | |
168 | those safely to '/' if any are found in the middle of the prepath */ | |
169 | /* BB test paths to Windows with '/' in the midst of prepath */ | |
646dd539 | 170 | |
a6b5058f AA |
171 | if (pplen) { |
172 | int i; | |
173 | ||
174 | cifs_dbg(FYI, "using cifs_sb prepath <%s>\n", cifs_sb->prepath); | |
175 | memcpy(full_path+dfsplen+1, cifs_sb->prepath, pplen-1); | |
c988de29 | 176 | full_path[dfsplen] = dirsep; |
a6b5058f AA |
177 | for (i = 0; i < pplen-1; i++) |
178 | if (full_path[dfsplen+1+i] == '/') | |
179 | full_path[dfsplen+1+i] = CIFS_DIR_SEP(cifs_sb); | |
180 | } | |
181 | ||
646dd539 | 182 | if (dfsplen) { |
0d424ad0 | 183 | strncpy(full_path, tcon->treeName, dfsplen); |
646dd539 SF |
184 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) { |
185 | int i; | |
186 | for (i = 0; i < dfsplen; i++) { | |
187 | if (full_path[i] == '\\') | |
188 | full_path[i] = '/'; | |
189 | } | |
190 | } | |
191 | } | |
1da177e4 LT |
192 | return full_path; |
193 | } | |
194 | ||
d2c12719 | 195 | /* |
d3edede2 | 196 | * Don't allow path components longer than the server max. |
d2c12719 MS |
197 | * Don't allow the separator character in a path component. |
198 | * The VFS will not allow "/", but "\" is allowed by posix. | |
199 | */ | |
200 | static int | |
d3edede2 | 201 | check_name(struct dentry *direntry, struct cifs_tcon *tcon) |
d2c12719 MS |
202 | { |
203 | struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb); | |
204 | int i; | |
205 | ||
f74bc7c6 RS |
206 | if (unlikely(tcon->fsAttrInfo.MaxPathNameComponentLength && |
207 | direntry->d_name.len > | |
6e3c1529 | 208 | le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength))) |
d3edede2 RS |
209 | return -ENAMETOOLONG; |
210 | ||
d2c12719 MS |
211 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)) { |
212 | for (i = 0; i < direntry->d_name.len; i++) { | |
213 | if (direntry->d_name.name[i] == '\\') { | |
f96637be | 214 | cifs_dbg(FYI, "Invalid file name\n"); |
d2c12719 MS |
215 | return -EINVAL; |
216 | } | |
217 | } | |
218 | } | |
219 | return 0; | |
220 | } | |
221 | ||
222 | ||
3979877e | 223 | /* Inode operations in similar order to how they appear in Linux file fs.h */ |
1da177e4 | 224 | |
6d5786a3 PS |
225 | static int |
226 | cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid, | |
227 | struct tcon_link *tlink, unsigned oflags, umode_t mode, | |
f1e32681 | 228 | __u32 *oplock, struct cifs_fid *fid) |
1da177e4 LT |
229 | { |
230 | int rc = -ENOENT; | |
67750fb9 | 231 | int create_options = CREATE_NOT_DIR; |
25364138 | 232 | int desired_access; |
d2c12719 MS |
233 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
234 | struct cifs_tcon *tcon = tlink_tcon(tlink); | |
1da177e4 | 235 | char *full_path = NULL; |
fb8c4b14 | 236 | FILE_ALL_INFO *buf = NULL; |
1da177e4 | 237 | struct inode *newinode = NULL; |
d2c12719 | 238 | int disposition; |
25364138 | 239 | struct TCP_Server_Info *server = tcon->ses->server; |
226730b4 | 240 | struct cifs_open_parms oparms; |
1da177e4 | 241 | |
d2c12719 | 242 | *oplock = 0; |
10b9b98e | 243 | if (tcon->ses->server->oplocks) |
d2c12719 | 244 | *oplock = REQ_OPLOCK; |
c3b2a0c6 | 245 | |
7ffec372 | 246 | full_path = build_path_from_dentry(direntry); |
598b6c57 ME |
247 | if (!full_path) |
248 | return -ENOMEM; | |
7ffec372 | 249 | |
29e20f9c | 250 | if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open && |
c3b2a0c6 SF |
251 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
252 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
25364138 PS |
253 | rc = cifs_posix_open(full_path, &newinode, inode->i_sb, mode, |
254 | oflags, oplock, &fid->netfid, xid); | |
d2c12719 MS |
255 | switch (rc) { |
256 | case 0: | |
257 | if (newinode == NULL) { | |
258 | /* query inode info */ | |
90e4ee5d | 259 | goto cifs_create_get_file_info; |
d2c12719 MS |
260 | } |
261 | ||
8d9535b6 SP |
262 | if (S_ISDIR(newinode->i_mode)) { |
263 | CIFSSMBClose(xid, tcon, fid->netfid); | |
264 | iput(newinode); | |
265 | rc = -EISDIR; | |
266 | goto out; | |
267 | } | |
268 | ||
d2c12719 MS |
269 | if (!S_ISREG(newinode->i_mode)) { |
270 | /* | |
271 | * The server may allow us to open things like | |
272 | * FIFOs, but the client isn't set up to deal | |
273 | * with that. If it's not a regular file, just | |
274 | * close it and proceed as if it were a normal | |
275 | * lookup. | |
276 | */ | |
25364138 | 277 | CIFSSMBClose(xid, tcon, fid->netfid); |
d2c12719 MS |
278 | goto cifs_create_get_file_info; |
279 | } | |
280 | /* success, no need to query */ | |
281 | goto cifs_create_set_dentry; | |
282 | ||
283 | case -ENOENT: | |
284 | goto cifs_create_get_file_info; | |
285 | ||
286 | case -EIO: | |
287 | case -EINVAL: | |
288 | /* | |
289 | * EIO could indicate that (posix open) operation is not | |
290 | * supported, despite what server claimed in capability | |
291 | * negotiation. | |
292 | * | |
293 | * POSIX open in samba versions 3.3.1 and earlier could | |
294 | * incorrectly fail with invalid parameter. | |
295 | */ | |
296 | tcon->broken_posix_open = true; | |
297 | break; | |
298 | ||
299 | case -EREMOTE: | |
300 | case -EOPNOTSUPP: | |
301 | /* | |
302 | * EREMOTE indicates DFS junction, which is not handled | |
303 | * in posix open. If either that or op not supported | |
304 | * returned, follow the normal lookup. | |
305 | */ | |
306 | break; | |
e08fc045 | 307 | |
d2c12719 MS |
308 | default: |
309 | goto out; | |
310 | } | |
311 | /* | |
312 | * fallthrough to retry, using older open call, this is case | |
313 | * where server does not support this SMB level, and falsely | |
314 | * claims capability (also get here for DFS case which should be | |
315 | * rare for path not covered on files) | |
316 | */ | |
1da177e4 LT |
317 | } |
318 | ||
25364138 | 319 | desired_access = 0; |
d2c12719 | 320 | if (OPEN_FMODE(oflags) & FMODE_READ) |
25364138 | 321 | desired_access |= GENERIC_READ; /* is this too little? */ |
d2c12719 | 322 | if (OPEN_FMODE(oflags) & FMODE_WRITE) |
25364138 | 323 | desired_access |= GENERIC_WRITE; |
d2c12719 MS |
324 | |
325 | disposition = FILE_OVERWRITE_IF; | |
326 | if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
327 | disposition = FILE_CREATE; | |
328 | else if ((oflags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
329 | disposition = FILE_OVERWRITE_IF; | |
330 | else if ((oflags & O_CREAT) == O_CREAT) | |
331 | disposition = FILE_OPEN_IF; | |
332 | else | |
f96637be | 333 | cifs_dbg(FYI, "Create flag not set in create function\n"); |
d2c12719 | 334 | |
25364138 PS |
335 | /* |
336 | * BB add processing to set equivalent of mode - e.g. via CreateX with | |
337 | * ACLs | |
338 | */ | |
339 | ||
340 | if (!server->ops->open) { | |
341 | rc = -ENOSYS; | |
342 | goto out; | |
343 | } | |
1da177e4 | 344 | |
5fdae1f6 SF |
345 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); |
346 | if (buf == NULL) { | |
232341ba | 347 | rc = -ENOMEM; |
d2c12719 | 348 | goto out; |
1da177e4 | 349 | } |
67750fb9 | 350 | |
67750fb9 JL |
351 | /* |
352 | * if we're not using unix extensions, see if we need to set | |
353 | * ATTR_READONLY on the create call | |
354 | */ | |
f818dd55 | 355 | if (!tcon->unix_ext && (mode & S_IWUGO) == 0) |
67750fb9 JL |
356 | create_options |= CREATE_OPTION_READONLY; |
357 | ||
226730b4 PS |
358 | oparms.tcon = tcon; |
359 | oparms.cifs_sb = cifs_sb; | |
360 | oparms.desired_access = desired_access; | |
0f060936 | 361 | oparms.create_options = cifs_create_options(cifs_sb, create_options); |
226730b4 PS |
362 | oparms.disposition = disposition; |
363 | oparms.path = full_path; | |
364 | oparms.fid = fid; | |
9cbc0b73 | 365 | oparms.reconnect = false; |
ce558b0e | 366 | oparms.mode = mode; |
226730b4 | 367 | rc = server->ops->open(xid, &oparms, oplock, buf); |
1da177e4 | 368 | if (rc) { |
f96637be | 369 | cifs_dbg(FYI, "cifs_create returned 0x%x\n", rc); |
d2c12719 | 370 | goto out; |
c3b2a0c6 SF |
371 | } |
372 | ||
25364138 PS |
373 | /* |
374 | * If Open reported that we actually created a file then we now have to | |
375 | * set the mode if possible. | |
376 | */ | |
d2c12719 | 377 | if ((tcon->unix_ext) && (*oplock & CIFS_CREATE_ACTION)) { |
c3b2a0c6 | 378 | struct cifs_unix_set_info_args args = { |
4e1e7fb9 JL |
379 | .mode = mode, |
380 | .ctime = NO_CHANGE_64, | |
381 | .atime = NO_CHANGE_64, | |
382 | .mtime = NO_CHANGE_64, | |
383 | .device = 0, | |
c3b2a0c6 SF |
384 | }; |
385 | ||
386 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) { | |
49418b2c | 387 | args.uid = current_fsuid(); |
c3b2a0c6 | 388 | if (inode->i_mode & S_ISGID) |
49418b2c | 389 | args.gid = inode->i_gid; |
c3b2a0c6 | 390 | else |
49418b2c | 391 | args.gid = current_fsgid(); |
3ce53fc4 | 392 | } else { |
49418b2c EB |
393 | args.uid = INVALID_UID; /* no change */ |
394 | args.gid = INVALID_GID; /* no change */ | |
1da177e4 | 395 | } |
25364138 PS |
396 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid->netfid, |
397 | current->tgid); | |
c3b2a0c6 | 398 | } else { |
25364138 PS |
399 | /* |
400 | * BB implement mode setting via Windows security | |
401 | * descriptors e.g. | |
402 | */ | |
c3b2a0c6 SF |
403 | /* CIFSSMBWinSetPerms(xid,tcon,path,mode,-1,-1,nls);*/ |
404 | ||
405 | /* Could set r/o dos attribute if mode & 0222 == 0 */ | |
406 | } | |
1da177e4 | 407 | |
c3b2a0c6 SF |
408 | cifs_create_get_file_info: |
409 | /* server might mask mode so we have to query for it */ | |
410 | if (tcon->unix_ext) | |
25364138 PS |
411 | rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb, |
412 | xid); | |
c3b2a0c6 | 413 | else { |
d313852d | 414 | /* TODO: Add support for calling POSIX query info here, but passing in fid */ |
25364138 | 415 | rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb, |
42eacf9e | 416 | xid, fid); |
c3b2a0c6 | 417 | if (newinode) { |
b8c32dbb PS |
418 | if (server->ops->set_lease_key) |
419 | server->ops->set_lease_key(newinode, fid); | |
c3b2a0c6 SF |
420 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) |
421 | newinode->i_mode = mode; | |
d2c12719 | 422 | if ((*oplock & CIFS_CREATE_ACTION) && |
c3b2a0c6 SF |
423 | (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) { |
424 | newinode->i_uid = current_fsuid(); | |
425 | if (inode->i_mode & S_ISGID) | |
426 | newinode->i_gid = inode->i_gid; | |
427 | else | |
428 | newinode->i_gid = current_fsgid(); | |
6473a559 | 429 | } |
1da177e4 | 430 | } |
c3b2a0c6 | 431 | } |
1da177e4 | 432 | |
c3b2a0c6 | 433 | cifs_create_set_dentry: |
d2c12719 | 434 | if (rc != 0) { |
f96637be JP |
435 | cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n", |
436 | rc); | |
8d9535b6 | 437 | goto out_err; |
d2c12719 | 438 | } |
8d9535b6 SP |
439 | |
440 | if (S_ISDIR(newinode->i_mode)) { | |
441 | rc = -EISDIR; | |
442 | goto out_err; | |
d2c12719 | 443 | } |
8d9535b6 | 444 | |
d2c12719 MS |
445 | d_drop(direntry); |
446 | d_add(direntry, newinode); | |
c3b2a0c6 | 447 | |
d2c12719 MS |
448 | out: |
449 | kfree(buf); | |
450 | kfree(full_path); | |
451 | return rc; | |
8d9535b6 SP |
452 | |
453 | out_err: | |
454 | if (server->ops->close) | |
455 | server->ops->close(xid, tcon, fid); | |
456 | if (newinode) | |
457 | iput(newinode); | |
458 | goto out; | |
d2c12719 | 459 | } |
6ca9f3ba | 460 | |
d9585277 | 461 | int |
d2c12719 | 462 | cifs_atomic_open(struct inode *inode, struct dentry *direntry, |
44907d79 | 463 | struct file *file, unsigned oflags, umode_t mode) |
d2c12719 MS |
464 | { |
465 | int rc; | |
6d5786a3 | 466 | unsigned int xid; |
d2c12719 MS |
467 | struct tcon_link *tlink; |
468 | struct cifs_tcon *tcon; | |
25364138 | 469 | struct TCP_Server_Info *server; |
fb1214e4 | 470 | struct cifs_fid fid; |
233839b1 | 471 | struct cifs_pending_open open; |
d2c12719 | 472 | __u32 oplock; |
fb1214e4 | 473 | struct cifsFileInfo *file_info; |
d2c12719 | 474 | |
fb1214e4 PS |
475 | /* |
476 | * Posix open is only called (at lookup time) for file create now. For | |
d2c12719 MS |
477 | * opens (rather than creates), because we do not know if it is a file |
478 | * or directory yet, and current Samba no longer allows us to do posix | |
479 | * open on dirs, we could end up wasting an open call on what turns out | |
480 | * to be a dir. For file opens, we wait to call posix open till | |
481 | * cifs_open. It could be added to atomic_open in the future but the | |
482 | * performance tradeoff of the extra network request when EISDIR or | |
483 | * EACCES is returned would have to be weighed against the 50% reduction | |
484 | * in network traffic in the other paths. | |
485 | */ | |
486 | if (!(oflags & O_CREAT)) { | |
3798f47a SP |
487 | struct dentry *res; |
488 | ||
489 | /* | |
490 | * Check for hashed negative dentry. We have already revalidated | |
491 | * the dentry and it is fine. No need to perform another lookup. | |
492 | */ | |
00699ad8 | 493 | if (!d_in_lookup(direntry)) |
3798f47a SP |
494 | return -ENOENT; |
495 | ||
496 | res = cifs_lookup(inode, direntry, 0); | |
d2c12719 | 497 | if (IS_ERR(res)) |
d9585277 | 498 | return PTR_ERR(res); |
d2c12719 | 499 | |
e45198a6 | 500 | return finish_no_open(file, res); |
d2c12719 MS |
501 | } |
502 | ||
6d5786a3 | 503 | xid = get_xid(); |
d2c12719 | 504 | |
35c265e0 AV |
505 | cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n", |
506 | inode, direntry, direntry); | |
d2c12719 MS |
507 | |
508 | tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb)); | |
efb79f28 WY |
509 | if (IS_ERR(tlink)) { |
510 | rc = PTR_ERR(tlink); | |
6d5786a3 | 511 | goto out_free_xid; |
efb79f28 | 512 | } |
d2c12719 MS |
513 | |
514 | tcon = tlink_tcon(tlink); | |
d3edede2 RS |
515 | |
516 | rc = check_name(direntry, tcon); | |
517 | if (rc) | |
f74bc7c6 | 518 | goto out; |
d3edede2 | 519 | |
25364138 | 520 | server = tcon->ses->server; |
d2c12719 | 521 | |
b8c32dbb PS |
522 | if (server->ops->new_lease_key) |
523 | server->ops->new_lease_key(&fid); | |
524 | ||
233839b1 PS |
525 | cifs_add_pending_open(&fid, tlink, &open); |
526 | ||
d2c12719 | 527 | rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode, |
f1e32681 | 528 | &oplock, &fid); |
d2c12719 | 529 | |
233839b1 PS |
530 | if (rc) { |
531 | cifs_del_pending_open(&open); | |
d2c12719 | 532 | goto out; |
233839b1 | 533 | } |
d2c12719 | 534 | |
f1e32681 | 535 | if ((oflags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) |
73a09dd9 | 536 | file->f_mode |= FMODE_CREATED; |
f1e32681 | 537 | |
be12af3e | 538 | rc = finish_open(file, direntry, generic_file_open); |
30d90494 | 539 | if (rc) { |
25364138 PS |
540 | if (server->ops->close) |
541 | server->ops->close(xid, tcon, &fid); | |
233839b1 | 542 | cifs_del_pending_open(&open); |
d2c12719 | 543 | goto out; |
5fdae1f6 | 544 | } |
2422f676 | 545 | |
787aded6 NJ |
546 | if (file->f_flags & O_DIRECT && |
547 | CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) { | |
548 | if (CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) | |
549 | file->f_op = &cifs_file_direct_nobrl_ops; | |
550 | else | |
551 | file->f_op = &cifs_file_direct_ops; | |
552 | } | |
553 | ||
fb1214e4 PS |
554 | file_info = cifs_new_fileinfo(&fid, file, tlink, oplock); |
555 | if (file_info == NULL) { | |
25364138 PS |
556 | if (server->ops->close) |
557 | server->ops->close(xid, tcon, &fid); | |
233839b1 | 558 | cifs_del_pending_open(&open); |
d9585277 | 559 | rc = -ENOMEM; |
d2c12719 MS |
560 | } |
561 | ||
562 | out: | |
563 | cifs_put_tlink(tlink); | |
6d5786a3 PS |
564 | out_free_xid: |
565 | free_xid(xid); | |
d9585277 | 566 | return rc; |
d2c12719 MS |
567 | } |
568 | ||
569 | int cifs_create(struct inode *inode, struct dentry *direntry, umode_t mode, | |
ebfc3b49 | 570 | bool excl) |
d2c12719 MS |
571 | { |
572 | int rc; | |
6d5786a3 | 573 | unsigned int xid = get_xid(); |
d2c12719 MS |
574 | /* |
575 | * BB below access is probably too much for mknod to request | |
576 | * but we have to do query and setpathinfo so requesting | |
577 | * less could fail (unless we want to request getatr and setatr | |
578 | * permissions (only). At least for POSIX we do not have to | |
579 | * request so much. | |
580 | */ | |
581 | unsigned oflags = O_EXCL | O_CREAT | O_RDWR; | |
582 | struct tcon_link *tlink; | |
25364138 PS |
583 | struct cifs_tcon *tcon; |
584 | struct TCP_Server_Info *server; | |
585 | struct cifs_fid fid; | |
d2c12719 | 586 | __u32 oplock; |
d2c12719 | 587 | |
35c265e0 AV |
588 | cifs_dbg(FYI, "cifs_create parent inode = 0x%p name is: %pd and dentry = 0x%p\n", |
589 | inode, direntry, direntry); | |
d2c12719 MS |
590 | |
591 | tlink = cifs_sb_tlink(CIFS_SB(inode->i_sb)); | |
592 | rc = PTR_ERR(tlink); | |
593 | if (IS_ERR(tlink)) | |
6d5786a3 | 594 | goto out_free_xid; |
d2c12719 | 595 | |
25364138 PS |
596 | tcon = tlink_tcon(tlink); |
597 | server = tcon->ses->server; | |
b8c32dbb PS |
598 | |
599 | if (server->ops->new_lease_key) | |
600 | server->ops->new_lease_key(&fid); | |
601 | ||
602 | rc = cifs_do_create(inode, direntry, xid, tlink, oflags, mode, | |
f1e32681 | 603 | &oplock, &fid); |
25364138 PS |
604 | if (!rc && server->ops->close) |
605 | server->ops->close(xid, tcon, &fid); | |
d2c12719 | 606 | |
7ffec372 | 607 | cifs_put_tlink(tlink); |
6d5786a3 PS |
608 | out_free_xid: |
609 | free_xid(xid); | |
1da177e4 LT |
610 | return rc; |
611 | } | |
612 | ||
1a67aafb | 613 | int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode, |
5fdae1f6 | 614 | dev_t device_number) |
1da177e4 LT |
615 | { |
616 | int rc = -EPERM; | |
6d5786a3 | 617 | unsigned int xid; |
1da177e4 | 618 | struct cifs_sb_info *cifs_sb; |
7ffec372 | 619 | struct tcon_link *tlink; |
dd120671 | 620 | struct cifs_tcon *tcon; |
1da177e4 | 621 | char *full_path = NULL; |
1da177e4 LT |
622 | |
623 | if (!old_valid_dev(device_number)) | |
624 | return -EINVAL; | |
625 | ||
1da177e4 | 626 | cifs_sb = CIFS_SB(inode->i_sb); |
7ffec372 JL |
627 | tlink = cifs_sb_tlink(cifs_sb); |
628 | if (IS_ERR(tlink)) | |
629 | return PTR_ERR(tlink); | |
630 | ||
dd120671 | 631 | tcon = tlink_tcon(tlink); |
7ffec372 | 632 | |
6d5786a3 | 633 | xid = get_xid(); |
1da177e4 | 634 | |
1da177e4 | 635 | full_path = build_path_from_dentry(direntry); |
5d9ac7fd | 636 | if (full_path == NULL) { |
1da177e4 | 637 | rc = -ENOMEM; |
5d9ac7fd JL |
638 | goto mknod_out; |
639 | } | |
640 | ||
c847dccf AA |
641 | rc = tcon->ses->server->ops->make_node(xid, inode, direntry, tcon, |
642 | full_path, mode, | |
643 | device_number); | |
5d9ac7fd JL |
644 | |
645 | mknod_out: | |
d14537f1 | 646 | kfree(full_path); |
6d5786a3 | 647 | free_xid(xid); |
7ffec372 | 648 | cifs_put_tlink(tlink); |
1da177e4 LT |
649 | return rc; |
650 | } | |
651 | ||
1da177e4 | 652 | struct dentry * |
5fdae1f6 | 653 | cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, |
00cd8dd3 | 654 | unsigned int flags) |
1da177e4 | 655 | { |
6d5786a3 | 656 | unsigned int xid; |
1da177e4 LT |
657 | int rc = 0; /* to get around spurious gcc warning, set to zero here */ |
658 | struct cifs_sb_info *cifs_sb; | |
7ffec372 | 659 | struct tcon_link *tlink; |
96daf2b0 | 660 | struct cifs_tcon *pTcon; |
1da177e4 LT |
661 | struct inode *newInode = NULL; |
662 | char *full_path = NULL; | |
663 | ||
6d5786a3 | 664 | xid = get_xid(); |
1da177e4 | 665 | |
35c265e0 AV |
666 | cifs_dbg(FYI, "parent inode = 0x%p name is: %pd and dentry = 0x%p\n", |
667 | parent_dir_inode, direntry, direntry); | |
1da177e4 | 668 | |
1da177e4 LT |
669 | /* check whether path exists */ |
670 | ||
671 | cifs_sb = CIFS_SB(parent_dir_inode->i_sb); | |
7ffec372 JL |
672 | tlink = cifs_sb_tlink(cifs_sb); |
673 | if (IS_ERR(tlink)) { | |
6d5786a3 | 674 | free_xid(xid); |
11f17c9b | 675 | return ERR_CAST(tlink); |
7ffec372 JL |
676 | } |
677 | pTcon = tlink_tcon(tlink); | |
1da177e4 | 678 | |
d3edede2 | 679 | rc = check_name(direntry, pTcon); |
11f17c9b AV |
680 | if (unlikely(rc)) { |
681 | cifs_put_tlink(tlink); | |
682 | free_xid(xid); | |
683 | return ERR_PTR(rc); | |
684 | } | |
5ddf1e0f | 685 | |
1da177e4 LT |
686 | /* can not grab the rename sem here since it would |
687 | deadlock in the cases (beginning of sys_rename itself) | |
688 | in which we already have the sb rename sem */ | |
689 | full_path = build_path_from_dentry(direntry); | |
5fdae1f6 | 690 | if (full_path == NULL) { |
11f17c9b AV |
691 | cifs_put_tlink(tlink); |
692 | free_xid(xid); | |
693 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
694 | } |
695 | ||
2b0143b5 | 696 | if (d_really_is_positive(direntry)) { |
f96637be | 697 | cifs_dbg(FYI, "non-NULL inode in lookup\n"); |
1da177e4 | 698 | } else { |
f96637be | 699 | cifs_dbg(FYI, "NULL inode in lookup\n"); |
1da177e4 | 700 | } |
f96637be | 701 | cifs_dbg(FYI, "Full path: %s inode = 0x%p\n", |
2b0143b5 | 702 | full_path, d_inode(direntry)); |
1da177e4 | 703 | |
790434ff SF |
704 | if (pTcon->posix_extensions) |
705 | rc = smb311_posix_get_inode_info(&newInode, full_path, parent_dir_inode->i_sb, xid); | |
706 | else if (pTcon->unix_ext) { | |
d2c12719 MS |
707 | rc = cifs_get_inode_info_unix(&newInode, full_path, |
708 | parent_dir_inode->i_sb, xid); | |
709 | } else { | |
1da177e4 | 710 | rc = cifs_get_inode_info(&newInode, full_path, NULL, |
a6ce4932 | 711 | parent_dir_inode->i_sb, xid, NULL); |
d2c12719 | 712 | } |
1da177e4 | 713 | |
a8b75f66 | 714 | if (rc == 0) { |
5fdae1f6 | 715 | /* since paths are not looked up by component - the parent |
3abb9272 | 716 | directories are presumed to be good here */ |
1da177e4 | 717 | renew_parental_timestamps(direntry); |
1da177e4 | 718 | } else if (rc == -ENOENT) { |
a00be0e3 | 719 | cifs_set_time(direntry, jiffies); |
11f17c9b AV |
720 | newInode = NULL; |
721 | } else { | |
722 | if (rc != -EACCES) { | |
723 | cifs_dbg(FYI, "Unexpected lookup error %d\n", rc); | |
724 | /* We special case check for Access Denied - since that | |
725 | is a common return code */ | |
726 | } | |
727 | newInode = ERR_PTR(rc); | |
1da177e4 | 728 | } |
d14537f1 | 729 | kfree(full_path); |
7ffec372 | 730 | cifs_put_tlink(tlink); |
6d5786a3 | 731 | free_xid(xid); |
11f17c9b | 732 | return d_splice_alias(newInode, direntry); |
1da177e4 LT |
733 | } |
734 | ||
1da177e4 | 735 | static int |
0b728e19 | 736 | cifs_d_revalidate(struct dentry *direntry, unsigned int flags) |
1da177e4 | 737 | { |
0b3d0ef9 PS |
738 | struct inode *inode; |
739 | ||
0b728e19 | 740 | if (flags & LOOKUP_RCU) |
34286d66 NP |
741 | return -ECHILD; |
742 | ||
2b0143b5 | 743 | if (d_really_is_positive(direntry)) { |
0b3d0ef9 PS |
744 | inode = d_inode(direntry); |
745 | if ((flags & LOOKUP_REVAL) && !CIFS_CACHE_READ(CIFS_I(inode))) | |
746 | CIFS_I(inode)->time = 0; /* force reval */ | |
747 | ||
df2cf170 | 748 | if (cifs_revalidate_dentry(direntry)) |
1da177e4 | 749 | return 0; |
ad4778fb GF |
750 | else { |
751 | /* | |
936ad909 IK |
752 | * If the inode wasn't known to be a dfs entry when |
753 | * the dentry was instantiated, such as when created | |
754 | * via ->readdir(), it needs to be set now since the | |
755 | * attributes will have been updated by | |
756 | * cifs_revalidate_dentry(). | |
ad4778fb | 757 | */ |
0b3d0ef9 | 758 | if (IS_AUTOMOUNT(inode) && |
936ad909 IK |
759 | !(direntry->d_flags & DCACHE_NEED_AUTOMOUNT)) { |
760 | spin_lock(&direntry->d_lock); | |
761 | direntry->d_flags |= DCACHE_NEED_AUTOMOUNT; | |
762 | spin_unlock(&direntry->d_lock); | |
763 | } | |
764 | ||
262f86ad | 765 | return 1; |
ad4778fb | 766 | } |
1da177e4 LT |
767 | } |
768 | ||
262f86ad NP |
769 | /* |
770 | * This may be nfsd (or something), anyway, we can't see the | |
771 | * intent of this. So, since this can be for creation, drop it. | |
772 | */ | |
0b728e19 | 773 | if (!flags) |
262f86ad NP |
774 | return 0; |
775 | ||
776 | /* | |
777 | * Drop the negative dentry, in order to make sure to use the | |
778 | * case sensitive name which is specified by user if this is | |
779 | * for creation. | |
780 | */ | |
0b728e19 | 781 | if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) |
407938e7 | 782 | return 0; |
262f86ad | 783 | |
a00be0e3 | 784 | if (time_after(jiffies, cifs_get_time(direntry) + HZ) || !lookupCacheEnabled) |
262f86ad NP |
785 | return 0; |
786 | ||
787 | return 1; | |
1da177e4 LT |
788 | } |
789 | ||
790 | /* static int cifs_d_delete(struct dentry *direntry) | |
791 | { | |
792 | int rc = 0; | |
793 | ||
35c265e0 | 794 | cifs_dbg(FYI, "In cifs d_delete, name = %pd\n", direntry); |
1da177e4 LT |
795 | |
796 | return rc; | |
797 | } */ | |
798 | ||
4fd03e84 | 799 | const struct dentry_operations cifs_dentry_ops = { |
1da177e4 | 800 | .d_revalidate = cifs_d_revalidate, |
01c64fea | 801 | .d_automount = cifs_dfs_d_automount, |
5fdae1f6 | 802 | /* d_delete: cifs_d_delete, */ /* not needed except for debugging */ |
1da177e4 | 803 | }; |
b92327fe | 804 | |
da53be12 | 805 | static int cifs_ci_hash(const struct dentry *dentry, struct qstr *q) |
b92327fe | 806 | { |
b1e6a015 | 807 | struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls; |
b92327fe | 808 | unsigned long hash; |
ec71e0e1 JL |
809 | wchar_t c; |
810 | int i, charlen; | |
b92327fe | 811 | |
8387ff25 | 812 | hash = init_name_hash(dentry); |
ec71e0e1 JL |
813 | for (i = 0; i < q->len; i += charlen) { |
814 | charlen = codepage->char2uni(&q->name[i], q->len - i, &c); | |
815 | /* error out if we can't convert the character */ | |
816 | if (unlikely(charlen < 0)) | |
817 | return charlen; | |
818 | hash = partial_name_hash(cifs_toupper(c), hash); | |
819 | } | |
b92327fe SF |
820 | q->hash = end_name_hash(hash); |
821 | ||
822 | return 0; | |
823 | } | |
824 | ||
6fa67e70 | 825 | static int cifs_ci_compare(const struct dentry *dentry, |
621e155a | 826 | unsigned int len, const char *str, const struct qstr *name) |
b92327fe | 827 | { |
d3fe1985 | 828 | struct nls_table *codepage = CIFS_SB(dentry->d_sb)->local_nls; |
ec71e0e1 JL |
829 | wchar_t c1, c2; |
830 | int i, l1, l2; | |
b92327fe | 831 | |
ec71e0e1 JL |
832 | /* |
833 | * We make the assumption here that uppercase characters in the local | |
834 | * codepage are always the same length as their lowercase counterparts. | |
835 | * | |
836 | * If that's ever not the case, then this will fail to match it. | |
837 | */ | |
838 | if (name->len != len) | |
839 | return 1; | |
840 | ||
841 | for (i = 0; i < len; i += l1) { | |
842 | /* Convert characters in both strings to UTF-16. */ | |
843 | l1 = codepage->char2uni(&str[i], len - i, &c1); | |
844 | l2 = codepage->char2uni(&name->name[i], name->len - i, &c2); | |
845 | ||
846 | /* | |
847 | * If we can't convert either character, just declare it to | |
848 | * be 1 byte long and compare the original byte. | |
849 | */ | |
850 | if (unlikely(l1 < 0 && l2 < 0)) { | |
851 | if (str[i] != name->name[i]) | |
852 | return 1; | |
853 | l1 = 1; | |
854 | continue; | |
855 | } | |
856 | ||
857 | /* | |
858 | * Here, we again ass|u|me that upper/lowercase versions of | |
859 | * a character are the same length in the local NLS. | |
860 | */ | |
861 | if (l1 != l2) | |
862 | return 1; | |
863 | ||
864 | /* Now compare uppercase versions of these characters */ | |
865 | if (cifs_toupper(c1) != cifs_toupper(c2)) | |
866 | return 1; | |
867 | } | |
868 | ||
869 | return 0; | |
b92327fe SF |
870 | } |
871 | ||
4fd03e84 | 872 | const struct dentry_operations cifs_ci_dentry_ops = { |
b92327fe SF |
873 | .d_revalidate = cifs_d_revalidate, |
874 | .d_hash = cifs_ci_hash, | |
875 | .d_compare = cifs_ci_compare, | |
01c64fea | 876 | .d_automount = cifs_dfs_d_automount, |
b92327fe | 877 | }; |