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Merge branch 'omap-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / fs / cifs / inode.c
1 /*
2 * fs/cifs/inode.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2010
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/fs.h>
22 #include <linux/stat.h>
23 #include <linux/slab.h>
24 #include <linux/pagemap.h>
25 #include <asm/div64.h>
26 #include "cifsfs.h"
27 #include "cifspdu.h"
28 #include "cifsglob.h"
29 #include "cifsproto.h"
30 #include "cifs_debug.h"
31 #include "cifs_fs_sb.h"
32 #include "fscache.h"
33
34
35 static void cifs_set_ops(struct inode *inode)
36 {
37 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
38
39 switch (inode->i_mode & S_IFMT) {
40 case S_IFREG:
41 inode->i_op = &cifs_file_inode_ops;
42 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
43 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
44 inode->i_fop = &cifs_file_direct_nobrl_ops;
45 else
46 inode->i_fop = &cifs_file_direct_ops;
47 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
48 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
49 inode->i_fop = &cifs_file_strict_nobrl_ops;
50 else
51 inode->i_fop = &cifs_file_strict_ops;
52 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
53 inode->i_fop = &cifs_file_nobrl_ops;
54 else { /* not direct, send byte range locks */
55 inode->i_fop = &cifs_file_ops;
56 }
57
58 /* check if server can support readpages */
59 if (cifs_sb_master_tcon(cifs_sb)->ses->server->maxBuf <
60 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
61 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
62 else
63 inode->i_data.a_ops = &cifs_addr_ops;
64 break;
65 case S_IFDIR:
66 #ifdef CONFIG_CIFS_DFS_UPCALL
67 if (IS_AUTOMOUNT(inode)) {
68 inode->i_op = &cifs_dfs_referral_inode_operations;
69 } else {
70 #else /* NO DFS support, treat as a directory */
71 {
72 #endif
73 inode->i_op = &cifs_dir_inode_ops;
74 inode->i_fop = &cifs_dir_ops;
75 }
76 break;
77 case S_IFLNK:
78 inode->i_op = &cifs_symlink_inode_ops;
79 break;
80 default:
81 init_special_inode(inode, inode->i_mode, inode->i_rdev);
82 break;
83 }
84 }
85
86 /* check inode attributes against fattr. If they don't match, tag the
87 * inode for cache invalidation
88 */
89 static void
90 cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
91 {
92 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
93
94 cFYI(1, "%s: revalidating inode %llu", __func__, cifs_i->uniqueid);
95
96 if (inode->i_state & I_NEW) {
97 cFYI(1, "%s: inode %llu is new", __func__, cifs_i->uniqueid);
98 return;
99 }
100
101 /* don't bother with revalidation if we have an oplock */
102 if (cifs_i->clientCanCacheRead) {
103 cFYI(1, "%s: inode %llu is oplocked", __func__,
104 cifs_i->uniqueid);
105 return;
106 }
107
108 /* revalidate if mtime or size have changed */
109 if (timespec_equal(&inode->i_mtime, &fattr->cf_mtime) &&
110 cifs_i->server_eof == fattr->cf_eof) {
111 cFYI(1, "%s: inode %llu is unchanged", __func__,
112 cifs_i->uniqueid);
113 return;
114 }
115
116 cFYI(1, "%s: invalidating inode %llu mapping", __func__,
117 cifs_i->uniqueid);
118 cifs_i->invalid_mapping = true;
119 }
120
121 /* populate an inode with info from a cifs_fattr struct */
122 void
123 cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
124 {
125 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
126 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
127 unsigned long oldtime = cifs_i->time;
128
129 cifs_revalidate_cache(inode, fattr);
130
131 inode->i_atime = fattr->cf_atime;
132 inode->i_mtime = fattr->cf_mtime;
133 inode->i_ctime = fattr->cf_ctime;
134 inode->i_rdev = fattr->cf_rdev;
135 inode->i_nlink = fattr->cf_nlink;
136 inode->i_uid = fattr->cf_uid;
137 inode->i_gid = fattr->cf_gid;
138
139 /* if dynperm is set, don't clobber existing mode */
140 if (inode->i_state & I_NEW ||
141 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM))
142 inode->i_mode = fattr->cf_mode;
143
144 cifs_i->cifsAttrs = fattr->cf_cifsattrs;
145
146 if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
147 cifs_i->time = 0;
148 else
149 cifs_i->time = jiffies;
150
151 cFYI(1, "inode 0x%p old_time=%ld new_time=%ld", inode,
152 oldtime, cifs_i->time);
153
154 cifs_i->delete_pending = fattr->cf_flags & CIFS_FATTR_DELETE_PENDING;
155
156 cifs_i->server_eof = fattr->cf_eof;
157 /*
158 * Can't safely change the file size here if the client is writing to
159 * it due to potential races.
160 */
161 spin_lock(&inode->i_lock);
162 if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) {
163 i_size_write(inode, fattr->cf_eof);
164
165 /*
166 * i_blocks is not related to (i_size / i_blksize),
167 * but instead 512 byte (2**9) size is required for
168 * calculating num blocks.
169 */
170 inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
171 }
172 spin_unlock(&inode->i_lock);
173
174 if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL)
175 inode->i_flags |= S_AUTOMOUNT;
176 cifs_set_ops(inode);
177 }
178
179 void
180 cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
181 {
182 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
183
184 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
185 return;
186
187 fattr->cf_uniqueid = iunique(sb, ROOT_I);
188 }
189
190 /* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
191 void
192 cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
193 struct cifs_sb_info *cifs_sb)
194 {
195 memset(fattr, 0, sizeof(*fattr));
196 fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
197 fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
198 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
199
200 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
201 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime);
202 fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange);
203 fattr->cf_mode = le64_to_cpu(info->Permissions);
204
205 /*
206 * Since we set the inode type below we need to mask off
207 * to avoid strange results if bits set above.
208 */
209 fattr->cf_mode &= ~S_IFMT;
210 switch (le32_to_cpu(info->Type)) {
211 case UNIX_FILE:
212 fattr->cf_mode |= S_IFREG;
213 fattr->cf_dtype = DT_REG;
214 break;
215 case UNIX_SYMLINK:
216 fattr->cf_mode |= S_IFLNK;
217 fattr->cf_dtype = DT_LNK;
218 break;
219 case UNIX_DIR:
220 fattr->cf_mode |= S_IFDIR;
221 fattr->cf_dtype = DT_DIR;
222 break;
223 case UNIX_CHARDEV:
224 fattr->cf_mode |= S_IFCHR;
225 fattr->cf_dtype = DT_CHR;
226 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
227 le64_to_cpu(info->DevMinor) & MINORMASK);
228 break;
229 case UNIX_BLOCKDEV:
230 fattr->cf_mode |= S_IFBLK;
231 fattr->cf_dtype = DT_BLK;
232 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
233 le64_to_cpu(info->DevMinor) & MINORMASK);
234 break;
235 case UNIX_FIFO:
236 fattr->cf_mode |= S_IFIFO;
237 fattr->cf_dtype = DT_FIFO;
238 break;
239 case UNIX_SOCKET:
240 fattr->cf_mode |= S_IFSOCK;
241 fattr->cf_dtype = DT_SOCK;
242 break;
243 default:
244 /* safest to call it a file if we do not know */
245 fattr->cf_mode |= S_IFREG;
246 fattr->cf_dtype = DT_REG;
247 cFYI(1, "unknown type %d", le32_to_cpu(info->Type));
248 break;
249 }
250
251 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
252 fattr->cf_uid = cifs_sb->mnt_uid;
253 else
254 fattr->cf_uid = le64_to_cpu(info->Uid);
255
256 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
257 fattr->cf_gid = cifs_sb->mnt_gid;
258 else
259 fattr->cf_gid = le64_to_cpu(info->Gid);
260
261 fattr->cf_nlink = le64_to_cpu(info->Nlinks);
262 }
263
264 /*
265 * Fill a cifs_fattr struct with fake inode info.
266 *
267 * Needed to setup cifs_fattr data for the directory which is the
268 * junction to the new submount (ie to setup the fake directory
269 * which represents a DFS referral).
270 */
271 static void
272 cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
273 {
274 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
275
276 cFYI(1, "creating fake fattr for DFS referral");
277
278 memset(fattr, 0, sizeof(*fattr));
279 fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
280 fattr->cf_uid = cifs_sb->mnt_uid;
281 fattr->cf_gid = cifs_sb->mnt_gid;
282 fattr->cf_atime = CURRENT_TIME;
283 fattr->cf_ctime = CURRENT_TIME;
284 fattr->cf_mtime = CURRENT_TIME;
285 fattr->cf_nlink = 2;
286 fattr->cf_flags |= CIFS_FATTR_DFS_REFERRAL;
287 }
288
289 int cifs_get_file_info_unix(struct file *filp)
290 {
291 int rc;
292 int xid;
293 FILE_UNIX_BASIC_INFO find_data;
294 struct cifs_fattr fattr;
295 struct inode *inode = filp->f_path.dentry->d_inode;
296 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
297 struct cifsFileInfo *cfile = filp->private_data;
298 struct cifsTconInfo *tcon = tlink_tcon(cfile->tlink);
299
300 xid = GetXid();
301 rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->netfid, &find_data);
302 if (!rc) {
303 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
304 } else if (rc == -EREMOTE) {
305 cifs_create_dfs_fattr(&fattr, inode->i_sb);
306 rc = 0;
307 }
308
309 cifs_fattr_to_inode(inode, &fattr);
310 FreeXid(xid);
311 return rc;
312 }
313
314 int cifs_get_inode_info_unix(struct inode **pinode,
315 const unsigned char *full_path,
316 struct super_block *sb, int xid)
317 {
318 int rc;
319 FILE_UNIX_BASIC_INFO find_data;
320 struct cifs_fattr fattr;
321 struct cifsTconInfo *tcon;
322 struct tcon_link *tlink;
323 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
324
325 cFYI(1, "Getting info on %s", full_path);
326
327 tlink = cifs_sb_tlink(cifs_sb);
328 if (IS_ERR(tlink))
329 return PTR_ERR(tlink);
330 tcon = tlink_tcon(tlink);
331
332 /* could have done a find first instead but this returns more info */
333 rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
334 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
335 CIFS_MOUNT_MAP_SPECIAL_CHR);
336 cifs_put_tlink(tlink);
337
338 if (!rc) {
339 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
340 } else if (rc == -EREMOTE) {
341 cifs_create_dfs_fattr(&fattr, sb);
342 rc = 0;
343 } else {
344 return rc;
345 }
346
347 /* check for Minshall+French symlinks */
348 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
349 int tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
350 if (tmprc)
351 cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
352 }
353
354 if (*pinode == NULL) {
355 /* get new inode */
356 cifs_fill_uniqueid(sb, &fattr);
357 *pinode = cifs_iget(sb, &fattr);
358 if (!*pinode)
359 rc = -ENOMEM;
360 } else {
361 /* we already have inode, update it */
362 cifs_fattr_to_inode(*pinode, &fattr);
363 }
364
365 return rc;
366 }
367
368 static int
369 cifs_sfu_type(struct cifs_fattr *fattr, const unsigned char *path,
370 struct cifs_sb_info *cifs_sb, int xid)
371 {
372 int rc;
373 int oplock = 0;
374 __u16 netfid;
375 struct tcon_link *tlink;
376 struct cifsTconInfo *tcon;
377 char buf[24];
378 unsigned int bytes_read;
379 char *pbuf;
380
381 pbuf = buf;
382
383 fattr->cf_mode &= ~S_IFMT;
384
385 if (fattr->cf_eof == 0) {
386 fattr->cf_mode |= S_IFIFO;
387 fattr->cf_dtype = DT_FIFO;
388 return 0;
389 } else if (fattr->cf_eof < 8) {
390 fattr->cf_mode |= S_IFREG;
391 fattr->cf_dtype = DT_REG;
392 return -EINVAL; /* EOPNOTSUPP? */
393 }
394
395 tlink = cifs_sb_tlink(cifs_sb);
396 if (IS_ERR(tlink))
397 return PTR_ERR(tlink);
398 tcon = tlink_tcon(tlink);
399
400 rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, GENERIC_READ,
401 CREATE_NOT_DIR, &netfid, &oplock, NULL,
402 cifs_sb->local_nls,
403 cifs_sb->mnt_cifs_flags &
404 CIFS_MOUNT_MAP_SPECIAL_CHR);
405 if (rc == 0) {
406 int buf_type = CIFS_NO_BUFFER;
407 /* Read header */
408 rc = CIFSSMBRead(xid, tcon, netfid,
409 24 /* length */, 0 /* offset */,
410 &bytes_read, &pbuf, &buf_type);
411 if ((rc == 0) && (bytes_read >= 8)) {
412 if (memcmp("IntxBLK", pbuf, 8) == 0) {
413 cFYI(1, "Block device");
414 fattr->cf_mode |= S_IFBLK;
415 fattr->cf_dtype = DT_BLK;
416 if (bytes_read == 24) {
417 /* we have enough to decode dev num */
418 __u64 mjr; /* major */
419 __u64 mnr; /* minor */
420 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
421 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
422 fattr->cf_rdev = MKDEV(mjr, mnr);
423 }
424 } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
425 cFYI(1, "Char device");
426 fattr->cf_mode |= S_IFCHR;
427 fattr->cf_dtype = DT_CHR;
428 if (bytes_read == 24) {
429 /* we have enough to decode dev num */
430 __u64 mjr; /* major */
431 __u64 mnr; /* minor */
432 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
433 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
434 fattr->cf_rdev = MKDEV(mjr, mnr);
435 }
436 } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
437 cFYI(1, "Symlink");
438 fattr->cf_mode |= S_IFLNK;
439 fattr->cf_dtype = DT_LNK;
440 } else {
441 fattr->cf_mode |= S_IFREG; /* file? */
442 fattr->cf_dtype = DT_REG;
443 rc = -EOPNOTSUPP;
444 }
445 } else {
446 fattr->cf_mode |= S_IFREG; /* then it is a file */
447 fattr->cf_dtype = DT_REG;
448 rc = -EOPNOTSUPP; /* or some unknown SFU type */
449 }
450 CIFSSMBClose(xid, tcon, netfid);
451 }
452 cifs_put_tlink(tlink);
453 return rc;
454 }
455
456 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */
457
458 /*
459 * Fetch mode bits as provided by SFU.
460 *
461 * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ?
462 */
463 static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
464 struct cifs_sb_info *cifs_sb, int xid)
465 {
466 #ifdef CONFIG_CIFS_XATTR
467 ssize_t rc;
468 char ea_value[4];
469 __u32 mode;
470 struct tcon_link *tlink;
471 struct cifsTconInfo *tcon;
472
473 tlink = cifs_sb_tlink(cifs_sb);
474 if (IS_ERR(tlink))
475 return PTR_ERR(tlink);
476 tcon = tlink_tcon(tlink);
477
478 rc = CIFSSMBQAllEAs(xid, tcon, path, "SETFILEBITS",
479 ea_value, 4 /* size of buf */, cifs_sb->local_nls,
480 cifs_sb->mnt_cifs_flags &
481 CIFS_MOUNT_MAP_SPECIAL_CHR);
482 cifs_put_tlink(tlink);
483 if (rc < 0)
484 return (int)rc;
485 else if (rc > 3) {
486 mode = le32_to_cpu(*((__le32 *)ea_value));
487 fattr->cf_mode &= ~SFBITS_MASK;
488 cFYI(1, "special bits 0%o org mode 0%o", mode,
489 fattr->cf_mode);
490 fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode;
491 cFYI(1, "special mode bits 0%o", mode);
492 }
493
494 return 0;
495 #else
496 return -EOPNOTSUPP;
497 #endif
498 }
499
500 /* Fill a cifs_fattr struct with info from FILE_ALL_INFO */
501 static void
502 cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
503 struct cifs_sb_info *cifs_sb, bool adjust_tz)
504 {
505 struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
506
507 memset(fattr, 0, sizeof(*fattr));
508 fattr->cf_cifsattrs = le32_to_cpu(info->Attributes);
509 if (info->DeletePending)
510 fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING;
511
512 if (info->LastAccessTime)
513 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
514 else
515 fattr->cf_atime = CURRENT_TIME;
516
517 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
518 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
519
520 if (adjust_tz) {
521 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
522 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
523 }
524
525 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
526 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
527 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
528
529 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
530 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
531 fattr->cf_dtype = DT_DIR;
532 } else {
533 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
534 fattr->cf_dtype = DT_REG;
535
536 /* clear write bits if ATTR_READONLY is set */
537 if (fattr->cf_cifsattrs & ATTR_READONLY)
538 fattr->cf_mode &= ~(S_IWUGO);
539 }
540
541 fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
542
543 fattr->cf_uid = cifs_sb->mnt_uid;
544 fattr->cf_gid = cifs_sb->mnt_gid;
545 }
546
547 int cifs_get_file_info(struct file *filp)
548 {
549 int rc;
550 int xid;
551 FILE_ALL_INFO find_data;
552 struct cifs_fattr fattr;
553 struct inode *inode = filp->f_path.dentry->d_inode;
554 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
555 struct cifsFileInfo *cfile = filp->private_data;
556 struct cifsTconInfo *tcon = tlink_tcon(cfile->tlink);
557
558 xid = GetXid();
559 rc = CIFSSMBQFileInfo(xid, tcon, cfile->netfid, &find_data);
560 if (rc == -EOPNOTSUPP || rc == -EINVAL) {
561 /*
562 * FIXME: legacy server -- fall back to path-based call?
563 * for now, just skip revalidating and mark inode for
564 * immediate reval.
565 */
566 rc = 0;
567 CIFS_I(inode)->time = 0;
568 goto cgfi_exit;
569 } else if (rc == -EREMOTE) {
570 cifs_create_dfs_fattr(&fattr, inode->i_sb);
571 rc = 0;
572 } else if (rc)
573 goto cgfi_exit;
574
575 /*
576 * don't bother with SFU junk here -- just mark inode as needing
577 * revalidation.
578 */
579 cifs_all_info_to_fattr(&fattr, &find_data, cifs_sb, false);
580 fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
581 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
582 cifs_fattr_to_inode(inode, &fattr);
583 cgfi_exit:
584 FreeXid(xid);
585 return rc;
586 }
587
588 int cifs_get_inode_info(struct inode **pinode,
589 const unsigned char *full_path, FILE_ALL_INFO *pfindData,
590 struct super_block *sb, int xid, const __u16 *pfid)
591 {
592 int rc = 0, tmprc;
593 struct cifsTconInfo *pTcon;
594 struct tcon_link *tlink;
595 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
596 char *buf = NULL;
597 bool adjustTZ = false;
598 struct cifs_fattr fattr;
599
600 tlink = cifs_sb_tlink(cifs_sb);
601 if (IS_ERR(tlink))
602 return PTR_ERR(tlink);
603 pTcon = tlink_tcon(tlink);
604
605 cFYI(1, "Getting info on %s", full_path);
606
607 if ((pfindData == NULL) && (*pinode != NULL)) {
608 if (CIFS_I(*pinode)->clientCanCacheRead) {
609 cFYI(1, "No need to revalidate cached inode sizes");
610 goto cgii_exit;
611 }
612 }
613
614 /* if file info not passed in then get it from server */
615 if (pfindData == NULL) {
616 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
617 if (buf == NULL) {
618 rc = -ENOMEM;
619 goto cgii_exit;
620 }
621 pfindData = (FILE_ALL_INFO *)buf;
622
623 /* could do find first instead but this returns more info */
624 rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
625 0 /* not legacy */,
626 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
627 CIFS_MOUNT_MAP_SPECIAL_CHR);
628 /* BB optimize code so we do not make the above call
629 when server claims no NT SMB support and the above call
630 failed at least once - set flag in tcon or mount */
631 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
632 rc = SMBQueryInformation(xid, pTcon, full_path,
633 pfindData, cifs_sb->local_nls,
634 cifs_sb->mnt_cifs_flags &
635 CIFS_MOUNT_MAP_SPECIAL_CHR);
636 adjustTZ = true;
637 }
638 }
639
640 if (!rc) {
641 cifs_all_info_to_fattr(&fattr, (FILE_ALL_INFO *) pfindData,
642 cifs_sb, adjustTZ);
643 } else if (rc == -EREMOTE) {
644 cifs_create_dfs_fattr(&fattr, sb);
645 rc = 0;
646 } else {
647 goto cgii_exit;
648 }
649
650 /*
651 * If an inode wasn't passed in, then get the inode number
652 *
653 * Is an i_ino of zero legal? Can we use that to check if the server
654 * supports returning inode numbers? Are there other sanity checks we
655 * can use to ensure that the server is really filling in that field?
656 *
657 * We can not use the IndexNumber field by default from Windows or
658 * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA
659 * CIFS spec claims that this value is unique within the scope of a
660 * share, and the windows docs hint that it's actually unique
661 * per-machine.
662 *
663 * There may be higher info levels that work but are there Windows
664 * server or network appliances for which IndexNumber field is not
665 * guaranteed unique?
666 */
667 if (*pinode == NULL) {
668 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
669 int rc1 = 0;
670
671 rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
672 full_path, &fattr.cf_uniqueid,
673 cifs_sb->local_nls,
674 cifs_sb->mnt_cifs_flags &
675 CIFS_MOUNT_MAP_SPECIAL_CHR);
676 if (rc1 || !fattr.cf_uniqueid) {
677 cFYI(1, "GetSrvInodeNum rc %d", rc1);
678 fattr.cf_uniqueid = iunique(sb, ROOT_I);
679 cifs_autodisable_serverino(cifs_sb);
680 }
681 } else {
682 fattr.cf_uniqueid = iunique(sb, ROOT_I);
683 }
684 } else {
685 fattr.cf_uniqueid = CIFS_I(*pinode)->uniqueid;
686 }
687
688 /* query for SFU type info if supported and needed */
689 if (fattr.cf_cifsattrs & ATTR_SYSTEM &&
690 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
691 tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid);
692 if (tmprc)
693 cFYI(1, "cifs_sfu_type failed: %d", tmprc);
694 }
695
696 #ifdef CONFIG_CIFS_ACL
697 /* fill in 0777 bits from ACL */
698 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
699 rc = cifs_acl_to_fattr(cifs_sb, &fattr, *pinode, full_path,
700 pfid);
701 if (rc) {
702 cFYI(1, "%s: Getting ACL failed with error: %d",
703 __func__, rc);
704 goto cgii_exit;
705 }
706 }
707 #endif /* CONFIG_CIFS_ACL */
708
709 /* fill in remaining high mode bits e.g. SUID, VTX */
710 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
711 cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
712
713 /* check for Minshall+French symlinks */
714 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
715 tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
716 if (tmprc)
717 cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
718 }
719
720 if (!*pinode) {
721 *pinode = cifs_iget(sb, &fattr);
722 if (!*pinode)
723 rc = -ENOMEM;
724 } else {
725 cifs_fattr_to_inode(*pinode, &fattr);
726 }
727
728 cgii_exit:
729 kfree(buf);
730 cifs_put_tlink(tlink);
731 return rc;
732 }
733
734 static const struct inode_operations cifs_ipc_inode_ops = {
735 .lookup = cifs_lookup,
736 };
737
738 char *cifs_build_path_to_root(struct cifs_sb_info *cifs_sb,
739 struct cifsTconInfo *tcon)
740 {
741 int pplen = cifs_sb->prepathlen;
742 int dfsplen;
743 char *full_path = NULL;
744
745 /* if no prefix path, simply set path to the root of share to "" */
746 if (pplen == 0) {
747 full_path = kmalloc(1, GFP_KERNEL);
748 if (full_path)
749 full_path[0] = 0;
750 return full_path;
751 }
752
753 if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
754 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
755 else
756 dfsplen = 0;
757
758 full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
759 if (full_path == NULL)
760 return full_path;
761
762 if (dfsplen) {
763 strncpy(full_path, tcon->treeName, dfsplen);
764 /* switch slash direction in prepath depending on whether
765 * windows or posix style path names
766 */
767 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
768 int i;
769 for (i = 0; i < dfsplen; i++) {
770 if (full_path[i] == '\\')
771 full_path[i] = '/';
772 }
773 }
774 }
775 strncpy(full_path + dfsplen, cifs_sb->prepath, pplen);
776 full_path[dfsplen + pplen] = 0; /* add trailing null */
777 return full_path;
778 }
779
780 static int
781 cifs_find_inode(struct inode *inode, void *opaque)
782 {
783 struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
784
785 /* don't match inode with different uniqueid */
786 if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
787 return 0;
788
789 /* use createtime like an i_generation field */
790 if (CIFS_I(inode)->createtime != fattr->cf_createtime)
791 return 0;
792
793 /* don't match inode of different type */
794 if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT))
795 return 0;
796
797 /* if it's not a directory or has no dentries, then flag it */
798 if (S_ISDIR(inode->i_mode) && !list_empty(&inode->i_dentry))
799 fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
800
801 return 1;
802 }
803
804 static int
805 cifs_init_inode(struct inode *inode, void *opaque)
806 {
807 struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
808
809 CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
810 CIFS_I(inode)->createtime = fattr->cf_createtime;
811 return 0;
812 }
813
814 /*
815 * walk dentry list for an inode and report whether it has aliases that
816 * are hashed. We use this to determine if a directory inode can actually
817 * be used.
818 */
819 static bool
820 inode_has_hashed_dentries(struct inode *inode)
821 {
822 struct dentry *dentry;
823
824 spin_lock(&inode->i_lock);
825 list_for_each_entry(dentry, &inode->i_dentry, d_alias) {
826 if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
827 spin_unlock(&inode->i_lock);
828 return true;
829 }
830 }
831 spin_unlock(&inode->i_lock);
832 return false;
833 }
834
835 /* Given fattrs, get a corresponding inode */
836 struct inode *
837 cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
838 {
839 unsigned long hash;
840 struct inode *inode;
841
842 retry_iget5_locked:
843 cFYI(1, "looking for uniqueid=%llu", fattr->cf_uniqueid);
844
845 /* hash down to 32-bits on 32-bit arch */
846 hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
847
848 inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
849 if (inode) {
850 /* was there a potentially problematic inode collision? */
851 if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
852 fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
853
854 if (inode_has_hashed_dentries(inode)) {
855 cifs_autodisable_serverino(CIFS_SB(sb));
856 iput(inode);
857 fattr->cf_uniqueid = iunique(sb, ROOT_I);
858 goto retry_iget5_locked;
859 }
860 }
861
862 cifs_fattr_to_inode(inode, fattr);
863 if (sb->s_flags & MS_NOATIME)
864 inode->i_flags |= S_NOATIME | S_NOCMTIME;
865 if (inode->i_state & I_NEW) {
866 inode->i_ino = hash;
867 if (S_ISREG(inode->i_mode))
868 inode->i_data.backing_dev_info = sb->s_bdi;
869 #ifdef CONFIG_CIFS_FSCACHE
870 /* initialize per-inode cache cookie pointer */
871 CIFS_I(inode)->fscache = NULL;
872 #endif
873 unlock_new_inode(inode);
874 }
875 }
876
877 return inode;
878 }
879
880 /* gets root inode */
881 struct inode *cifs_root_iget(struct super_block *sb, unsigned long ino)
882 {
883 int xid;
884 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
885 struct inode *inode = NULL;
886 long rc;
887 char *full_path;
888 struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
889
890 full_path = cifs_build_path_to_root(cifs_sb, tcon);
891 if (full_path == NULL)
892 return ERR_PTR(-ENOMEM);
893
894 xid = GetXid();
895 if (tcon->unix_ext)
896 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
897 else
898 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
899 xid, NULL);
900
901 if (!inode) {
902 inode = ERR_PTR(rc);
903 goto out;
904 }
905
906 #ifdef CONFIG_CIFS_FSCACHE
907 /* populate tcon->resource_id */
908 tcon->resource_id = CIFS_I(inode)->uniqueid;
909 #endif
910
911 if (rc && tcon->ipc) {
912 cFYI(1, "ipc connection - fake read inode");
913 inode->i_mode |= S_IFDIR;
914 inode->i_nlink = 2;
915 inode->i_op = &cifs_ipc_inode_ops;
916 inode->i_fop = &simple_dir_operations;
917 inode->i_uid = cifs_sb->mnt_uid;
918 inode->i_gid = cifs_sb->mnt_gid;
919 } else if (rc) {
920 iget_failed(inode);
921 inode = ERR_PTR(rc);
922 }
923
924 out:
925 kfree(full_path);
926 /* can not call macro FreeXid here since in a void func
927 * TODO: This is no longer true
928 */
929 _FreeXid(xid);
930 return inode;
931 }
932
933 static int
934 cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
935 char *full_path, __u32 dosattr)
936 {
937 int rc;
938 int oplock = 0;
939 __u16 netfid;
940 __u32 netpid;
941 bool set_time = false;
942 struct cifsFileInfo *open_file;
943 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
944 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
945 struct tcon_link *tlink = NULL;
946 struct cifsTconInfo *pTcon;
947 FILE_BASIC_INFO info_buf;
948
949 if (attrs == NULL)
950 return -EINVAL;
951
952 if (attrs->ia_valid & ATTR_ATIME) {
953 set_time = true;
954 info_buf.LastAccessTime =
955 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
956 } else
957 info_buf.LastAccessTime = 0;
958
959 if (attrs->ia_valid & ATTR_MTIME) {
960 set_time = true;
961 info_buf.LastWriteTime =
962 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
963 } else
964 info_buf.LastWriteTime = 0;
965
966 /*
967 * Samba throws this field away, but windows may actually use it.
968 * Do not set ctime unless other time stamps are changed explicitly
969 * (i.e. by utimes()) since we would then have a mix of client and
970 * server times.
971 */
972 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
973 cFYI(1, "CIFS - CTIME changed");
974 info_buf.ChangeTime =
975 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
976 } else
977 info_buf.ChangeTime = 0;
978
979 info_buf.CreationTime = 0; /* don't change */
980 info_buf.Attributes = cpu_to_le32(dosattr);
981
982 /*
983 * If the file is already open for write, just use that fileid
984 */
985 open_file = find_writable_file(cifsInode, true);
986 if (open_file) {
987 netfid = open_file->netfid;
988 netpid = open_file->pid;
989 pTcon = tlink_tcon(open_file->tlink);
990 goto set_via_filehandle;
991 }
992
993 tlink = cifs_sb_tlink(cifs_sb);
994 if (IS_ERR(tlink)) {
995 rc = PTR_ERR(tlink);
996 tlink = NULL;
997 goto out;
998 }
999 pTcon = tlink_tcon(tlink);
1000
1001 /*
1002 * NT4 apparently returns success on this call, but it doesn't
1003 * really work.
1004 */
1005 if (!(pTcon->ses->flags & CIFS_SES_NT4)) {
1006 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
1007 &info_buf, cifs_sb->local_nls,
1008 cifs_sb->mnt_cifs_flags &
1009 CIFS_MOUNT_MAP_SPECIAL_CHR);
1010 if (rc == 0) {
1011 cifsInode->cifsAttrs = dosattr;
1012 goto out;
1013 } else if (rc != -EOPNOTSUPP && rc != -EINVAL)
1014 goto out;
1015 }
1016
1017 cFYI(1, "calling SetFileInfo since SetPathInfo for "
1018 "times not supported by this server");
1019 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1020 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1021 CREATE_NOT_DIR, &netfid, &oplock,
1022 NULL, cifs_sb->local_nls,
1023 cifs_sb->mnt_cifs_flags &
1024 CIFS_MOUNT_MAP_SPECIAL_CHR);
1025
1026 if (rc != 0) {
1027 if (rc == -EIO)
1028 rc = -EINVAL;
1029 goto out;
1030 }
1031
1032 netpid = current->tgid;
1033
1034 set_via_filehandle:
1035 rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
1036 if (!rc)
1037 cifsInode->cifsAttrs = dosattr;
1038
1039 if (open_file == NULL)
1040 CIFSSMBClose(xid, pTcon, netfid);
1041 else
1042 cifsFileInfo_put(open_file);
1043 out:
1044 if (tlink != NULL)
1045 cifs_put_tlink(tlink);
1046 return rc;
1047 }
1048
1049 /*
1050 * open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
1051 * and rename it to a random name that hopefully won't conflict with
1052 * anything else.
1053 */
1054 static int
1055 cifs_rename_pending_delete(char *full_path, struct dentry *dentry, int xid)
1056 {
1057 int oplock = 0;
1058 int rc;
1059 __u16 netfid;
1060 struct inode *inode = dentry->d_inode;
1061 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1062 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1063 struct tcon_link *tlink;
1064 struct cifsTconInfo *tcon;
1065 __u32 dosattr, origattr;
1066 FILE_BASIC_INFO *info_buf = NULL;
1067
1068 tlink = cifs_sb_tlink(cifs_sb);
1069 if (IS_ERR(tlink))
1070 return PTR_ERR(tlink);
1071 tcon = tlink_tcon(tlink);
1072
1073 rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
1074 DELETE|FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
1075 &netfid, &oplock, NULL, cifs_sb->local_nls,
1076 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1077 if (rc != 0)
1078 goto out;
1079
1080 origattr = cifsInode->cifsAttrs;
1081 if (origattr == 0)
1082 origattr |= ATTR_NORMAL;
1083
1084 dosattr = origattr & ~ATTR_READONLY;
1085 if (dosattr == 0)
1086 dosattr |= ATTR_NORMAL;
1087 dosattr |= ATTR_HIDDEN;
1088
1089 /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
1090 if (dosattr != origattr) {
1091 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
1092 if (info_buf == NULL) {
1093 rc = -ENOMEM;
1094 goto out_close;
1095 }
1096 info_buf->Attributes = cpu_to_le32(dosattr);
1097 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
1098 current->tgid);
1099 /* although we would like to mark the file hidden
1100 if that fails we will still try to rename it */
1101 if (rc != 0)
1102 cifsInode->cifsAttrs = dosattr;
1103 else
1104 dosattr = origattr; /* since not able to change them */
1105 }
1106
1107 /* rename the file */
1108 rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
1109 cifs_sb->mnt_cifs_flags &
1110 CIFS_MOUNT_MAP_SPECIAL_CHR);
1111 if (rc != 0) {
1112 rc = -ETXTBSY;
1113 goto undo_setattr;
1114 }
1115
1116 /* try to set DELETE_ON_CLOSE */
1117 if (!cifsInode->delete_pending) {
1118 rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid,
1119 current->tgid);
1120 /*
1121 * some samba versions return -ENOENT when we try to set the
1122 * file disposition here. Likely a samba bug, but work around
1123 * it for now. This means that some cifsXXX files may hang
1124 * around after they shouldn't.
1125 *
1126 * BB: remove this hack after more servers have the fix
1127 */
1128 if (rc == -ENOENT)
1129 rc = 0;
1130 else if (rc != 0) {
1131 rc = -ETXTBSY;
1132 goto undo_rename;
1133 }
1134 cifsInode->delete_pending = true;
1135 }
1136
1137 out_close:
1138 CIFSSMBClose(xid, tcon, netfid);
1139 out:
1140 kfree(info_buf);
1141 cifs_put_tlink(tlink);
1142 return rc;
1143
1144 /*
1145 * reset everything back to the original state. Don't bother
1146 * dealing with errors here since we can't do anything about
1147 * them anyway.
1148 */
1149 undo_rename:
1150 CIFSSMBRenameOpenFile(xid, tcon, netfid, dentry->d_name.name,
1151 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1152 CIFS_MOUNT_MAP_SPECIAL_CHR);
1153 undo_setattr:
1154 if (dosattr != origattr) {
1155 info_buf->Attributes = cpu_to_le32(origattr);
1156 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
1157 current->tgid))
1158 cifsInode->cifsAttrs = origattr;
1159 }
1160
1161 goto out_close;
1162 }
1163
1164
1165 /*
1166 * If dentry->d_inode is null (usually meaning the cached dentry
1167 * is a negative dentry) then we would attempt a standard SMB delete, but
1168 * if that fails we can not attempt the fall back mechanisms on EACCESS
1169 * but will return the EACCESS to the caller. Note that the VFS does not call
1170 * unlink on negative dentries currently.
1171 */
1172 int cifs_unlink(struct inode *dir, struct dentry *dentry)
1173 {
1174 int rc = 0;
1175 int xid;
1176 char *full_path = NULL;
1177 struct inode *inode = dentry->d_inode;
1178 struct cifsInodeInfo *cifs_inode;
1179 struct super_block *sb = dir->i_sb;
1180 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1181 struct tcon_link *tlink;
1182 struct cifsTconInfo *tcon;
1183 struct iattr *attrs = NULL;
1184 __u32 dosattr = 0, origattr = 0;
1185
1186 cFYI(1, "cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry);
1187
1188 tlink = cifs_sb_tlink(cifs_sb);
1189 if (IS_ERR(tlink))
1190 return PTR_ERR(tlink);
1191 tcon = tlink_tcon(tlink);
1192
1193 xid = GetXid();
1194
1195 /* Unlink can be called from rename so we can not take the
1196 * sb->s_vfs_rename_mutex here */
1197 full_path = build_path_from_dentry(dentry);
1198 if (full_path == NULL) {
1199 rc = -ENOMEM;
1200 goto unlink_out;
1201 }
1202
1203 if ((tcon->ses->capabilities & CAP_UNIX) &&
1204 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1205 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1206 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
1207 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
1208 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1209 cFYI(1, "posix del rc %d", rc);
1210 if ((rc == 0) || (rc == -ENOENT))
1211 goto psx_del_no_retry;
1212 }
1213
1214 retry_std_delete:
1215 rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
1216 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1217
1218 psx_del_no_retry:
1219 if (!rc) {
1220 if (inode)
1221 drop_nlink(inode);
1222 } else if (rc == -ENOENT) {
1223 d_drop(dentry);
1224 } else if (rc == -ETXTBSY) {
1225 rc = cifs_rename_pending_delete(full_path, dentry, xid);
1226 if (rc == 0)
1227 drop_nlink(inode);
1228 } else if ((rc == -EACCES) && (dosattr == 0) && inode) {
1229 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1230 if (attrs == NULL) {
1231 rc = -ENOMEM;
1232 goto out_reval;
1233 }
1234
1235 /* try to reset dos attributes */
1236 cifs_inode = CIFS_I(inode);
1237 origattr = cifs_inode->cifsAttrs;
1238 if (origattr == 0)
1239 origattr |= ATTR_NORMAL;
1240 dosattr = origattr & ~ATTR_READONLY;
1241 if (dosattr == 0)
1242 dosattr |= ATTR_NORMAL;
1243 dosattr |= ATTR_HIDDEN;
1244
1245 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1246 if (rc != 0)
1247 goto out_reval;
1248
1249 goto retry_std_delete;
1250 }
1251
1252 /* undo the setattr if we errored out and it's needed */
1253 if (rc != 0 && dosattr != 0)
1254 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
1255
1256 out_reval:
1257 if (inode) {
1258 cifs_inode = CIFS_I(inode);
1259 cifs_inode->time = 0; /* will force revalidate to get info
1260 when needed */
1261 inode->i_ctime = current_fs_time(sb);
1262 }
1263 dir->i_ctime = dir->i_mtime = current_fs_time(sb);
1264 cifs_inode = CIFS_I(dir);
1265 CIFS_I(dir)->time = 0; /* force revalidate of dir as well */
1266 unlink_out:
1267 kfree(full_path);
1268 kfree(attrs);
1269 FreeXid(xid);
1270 cifs_put_tlink(tlink);
1271 return rc;
1272 }
1273
1274 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
1275 {
1276 int rc = 0, tmprc;
1277 int xid;
1278 struct cifs_sb_info *cifs_sb;
1279 struct tcon_link *tlink;
1280 struct cifsTconInfo *pTcon;
1281 char *full_path = NULL;
1282 struct inode *newinode = NULL;
1283 struct cifs_fattr fattr;
1284
1285 cFYI(1, "In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode);
1286
1287 cifs_sb = CIFS_SB(inode->i_sb);
1288 tlink = cifs_sb_tlink(cifs_sb);
1289 if (IS_ERR(tlink))
1290 return PTR_ERR(tlink);
1291 pTcon = tlink_tcon(tlink);
1292
1293 xid = GetXid();
1294
1295 full_path = build_path_from_dentry(direntry);
1296 if (full_path == NULL) {
1297 rc = -ENOMEM;
1298 goto mkdir_out;
1299 }
1300
1301 if ((pTcon->ses->capabilities & CAP_UNIX) &&
1302 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1303 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
1304 u32 oplock = 0;
1305 FILE_UNIX_BASIC_INFO *pInfo =
1306 kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1307 if (pInfo == NULL) {
1308 rc = -ENOMEM;
1309 goto mkdir_out;
1310 }
1311
1312 mode &= ~current_umask();
1313 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
1314 mode, NULL /* netfid */, pInfo, &oplock,
1315 full_path, cifs_sb->local_nls,
1316 cifs_sb->mnt_cifs_flags &
1317 CIFS_MOUNT_MAP_SPECIAL_CHR);
1318 if (rc == -EOPNOTSUPP) {
1319 kfree(pInfo);
1320 goto mkdir_retry_old;
1321 } else if (rc) {
1322 cFYI(1, "posix mkdir returned 0x%x", rc);
1323 d_drop(direntry);
1324 } else {
1325 if (pInfo->Type == cpu_to_le32(-1)) {
1326 /* no return info, go query for it */
1327 kfree(pInfo);
1328 goto mkdir_get_info;
1329 }
1330 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
1331 to set uid/gid */
1332 inc_nlink(inode);
1333
1334 cifs_unix_basic_to_fattr(&fattr, pInfo, cifs_sb);
1335 cifs_fill_uniqueid(inode->i_sb, &fattr);
1336 newinode = cifs_iget(inode->i_sb, &fattr);
1337 if (!newinode) {
1338 kfree(pInfo);
1339 goto mkdir_get_info;
1340 }
1341
1342 d_instantiate(direntry, newinode);
1343
1344 #ifdef CONFIG_CIFS_DEBUG2
1345 cFYI(1, "instantiated dentry %p %s to inode %p",
1346 direntry, direntry->d_name.name, newinode);
1347
1348 if (newinode->i_nlink != 2)
1349 cFYI(1, "unexpected number of links %d",
1350 newinode->i_nlink);
1351 #endif
1352 }
1353 kfree(pInfo);
1354 goto mkdir_out;
1355 }
1356 mkdir_retry_old:
1357 /* BB add setting the equivalent of mode via CreateX w/ACLs */
1358 rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
1359 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1360 if (rc) {
1361 cFYI(1, "cifs_mkdir returned 0x%x", rc);
1362 d_drop(direntry);
1363 } else {
1364 mkdir_get_info:
1365 inc_nlink(inode);
1366 if (pTcon->unix_ext)
1367 rc = cifs_get_inode_info_unix(&newinode, full_path,
1368 inode->i_sb, xid);
1369 else
1370 rc = cifs_get_inode_info(&newinode, full_path, NULL,
1371 inode->i_sb, xid, NULL);
1372
1373 d_instantiate(direntry, newinode);
1374 /* setting nlink not necessary except in cases where we
1375 * failed to get it from the server or was set bogus */
1376 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1377 direntry->d_inode->i_nlink = 2;
1378
1379 mode &= ~current_umask();
1380 /* must turn on setgid bit if parent dir has it */
1381 if (inode->i_mode & S_ISGID)
1382 mode |= S_ISGID;
1383
1384 if (pTcon->unix_ext) {
1385 struct cifs_unix_set_info_args args = {
1386 .mode = mode,
1387 .ctime = NO_CHANGE_64,
1388 .atime = NO_CHANGE_64,
1389 .mtime = NO_CHANGE_64,
1390 .device = 0,
1391 };
1392 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1393 args.uid = (__u64)current_fsuid();
1394 if (inode->i_mode & S_ISGID)
1395 args.gid = (__u64)inode->i_gid;
1396 else
1397 args.gid = (__u64)current_fsgid();
1398 } else {
1399 args.uid = NO_CHANGE_64;
1400 args.gid = NO_CHANGE_64;
1401 }
1402 CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
1403 cifs_sb->local_nls,
1404 cifs_sb->mnt_cifs_flags &
1405 CIFS_MOUNT_MAP_SPECIAL_CHR);
1406 } else {
1407 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1408 (mode & S_IWUGO) == 0) {
1409 FILE_BASIC_INFO pInfo;
1410 struct cifsInodeInfo *cifsInode;
1411 u32 dosattrs;
1412
1413 memset(&pInfo, 0, sizeof(pInfo));
1414 cifsInode = CIFS_I(newinode);
1415 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
1416 pInfo.Attributes = cpu_to_le32(dosattrs);
1417 tmprc = CIFSSMBSetPathInfo(xid, pTcon,
1418 full_path, &pInfo,
1419 cifs_sb->local_nls,
1420 cifs_sb->mnt_cifs_flags &
1421 CIFS_MOUNT_MAP_SPECIAL_CHR);
1422 if (tmprc == 0)
1423 cifsInode->cifsAttrs = dosattrs;
1424 }
1425 if (direntry->d_inode) {
1426 if (cifs_sb->mnt_cifs_flags &
1427 CIFS_MOUNT_DYNPERM)
1428 direntry->d_inode->i_mode =
1429 (mode | S_IFDIR);
1430
1431 if (cifs_sb->mnt_cifs_flags &
1432 CIFS_MOUNT_SET_UID) {
1433 direntry->d_inode->i_uid =
1434 current_fsuid();
1435 if (inode->i_mode & S_ISGID)
1436 direntry->d_inode->i_gid =
1437 inode->i_gid;
1438 else
1439 direntry->d_inode->i_gid =
1440 current_fsgid();
1441 }
1442 }
1443 }
1444 }
1445 mkdir_out:
1446 kfree(full_path);
1447 FreeXid(xid);
1448 cifs_put_tlink(tlink);
1449 return rc;
1450 }
1451
1452 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1453 {
1454 int rc = 0;
1455 int xid;
1456 struct cifs_sb_info *cifs_sb;
1457 struct tcon_link *tlink;
1458 struct cifsTconInfo *pTcon;
1459 char *full_path = NULL;
1460 struct cifsInodeInfo *cifsInode;
1461
1462 cFYI(1, "cifs_rmdir, inode = 0x%p", inode);
1463
1464 xid = GetXid();
1465
1466 full_path = build_path_from_dentry(direntry);
1467 if (full_path == NULL) {
1468 rc = -ENOMEM;
1469 goto rmdir_exit;
1470 }
1471
1472 cifs_sb = CIFS_SB(inode->i_sb);
1473 tlink = cifs_sb_tlink(cifs_sb);
1474 if (IS_ERR(tlink)) {
1475 rc = PTR_ERR(tlink);
1476 goto rmdir_exit;
1477 }
1478 pTcon = tlink_tcon(tlink);
1479
1480 rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1481 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1482 cifs_put_tlink(tlink);
1483
1484 if (!rc) {
1485 drop_nlink(inode);
1486 spin_lock(&direntry->d_inode->i_lock);
1487 i_size_write(direntry->d_inode, 0);
1488 clear_nlink(direntry->d_inode);
1489 spin_unlock(&direntry->d_inode->i_lock);
1490 }
1491
1492 cifsInode = CIFS_I(direntry->d_inode);
1493 cifsInode->time = 0; /* force revalidate to go get info when
1494 needed */
1495
1496 cifsInode = CIFS_I(inode);
1497 cifsInode->time = 0; /* force revalidate to get parent dir info
1498 since cached search results now invalid */
1499
1500 direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1501 current_fs_time(inode->i_sb);
1502
1503 rmdir_exit:
1504 kfree(full_path);
1505 FreeXid(xid);
1506 return rc;
1507 }
1508
1509 static int
1510 cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
1511 struct dentry *to_dentry, const char *toPath)
1512 {
1513 struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1514 struct tcon_link *tlink;
1515 struct cifsTconInfo *pTcon;
1516 __u16 srcfid;
1517 int oplock, rc;
1518
1519 tlink = cifs_sb_tlink(cifs_sb);
1520 if (IS_ERR(tlink))
1521 return PTR_ERR(tlink);
1522 pTcon = tlink_tcon(tlink);
1523
1524 /* try path-based rename first */
1525 rc = CIFSSMBRename(xid, pTcon, fromPath, toPath, cifs_sb->local_nls,
1526 cifs_sb->mnt_cifs_flags &
1527 CIFS_MOUNT_MAP_SPECIAL_CHR);
1528
1529 /*
1530 * don't bother with rename by filehandle unless file is busy and
1531 * source Note that cross directory moves do not work with
1532 * rename by filehandle to various Windows servers.
1533 */
1534 if (rc == 0 || rc != -ETXTBSY)
1535 goto do_rename_exit;
1536
1537 /* open-file renames don't work across directories */
1538 if (to_dentry->d_parent != from_dentry->d_parent)
1539 goto do_rename_exit;
1540
1541 /* open the file to be renamed -- we need DELETE perms */
1542 rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
1543 CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1544 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1545 CIFS_MOUNT_MAP_SPECIAL_CHR);
1546
1547 if (rc == 0) {
1548 rc = CIFSSMBRenameOpenFile(xid, pTcon, srcfid,
1549 (const char *) to_dentry->d_name.name,
1550 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1551 CIFS_MOUNT_MAP_SPECIAL_CHR);
1552
1553 CIFSSMBClose(xid, pTcon, srcfid);
1554 }
1555 do_rename_exit:
1556 cifs_put_tlink(tlink);
1557 return rc;
1558 }
1559
1560 int cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
1561 struct inode *target_dir, struct dentry *target_dentry)
1562 {
1563 char *fromName = NULL;
1564 char *toName = NULL;
1565 struct cifs_sb_info *cifs_sb;
1566 struct tcon_link *tlink;
1567 struct cifsTconInfo *tcon;
1568 FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1569 FILE_UNIX_BASIC_INFO *info_buf_target;
1570 int xid, rc, tmprc;
1571
1572 cifs_sb = CIFS_SB(source_dir->i_sb);
1573 tlink = cifs_sb_tlink(cifs_sb);
1574 if (IS_ERR(tlink))
1575 return PTR_ERR(tlink);
1576 tcon = tlink_tcon(tlink);
1577
1578 xid = GetXid();
1579
1580 /*
1581 * we already have the rename sem so we do not need to
1582 * grab it again here to protect the path integrity
1583 */
1584 fromName = build_path_from_dentry(source_dentry);
1585 if (fromName == NULL) {
1586 rc = -ENOMEM;
1587 goto cifs_rename_exit;
1588 }
1589
1590 toName = build_path_from_dentry(target_dentry);
1591 if (toName == NULL) {
1592 rc = -ENOMEM;
1593 goto cifs_rename_exit;
1594 }
1595
1596 rc = cifs_do_rename(xid, source_dentry, fromName,
1597 target_dentry, toName);
1598
1599 if (rc == -EEXIST && tcon->unix_ext) {
1600 /*
1601 * Are src and dst hardlinks of same inode? We can
1602 * only tell with unix extensions enabled
1603 */
1604 info_buf_source =
1605 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1606 GFP_KERNEL);
1607 if (info_buf_source == NULL) {
1608 rc = -ENOMEM;
1609 goto cifs_rename_exit;
1610 }
1611
1612 info_buf_target = info_buf_source + 1;
1613 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, fromName,
1614 info_buf_source,
1615 cifs_sb->local_nls,
1616 cifs_sb->mnt_cifs_flags &
1617 CIFS_MOUNT_MAP_SPECIAL_CHR);
1618 if (tmprc != 0)
1619 goto unlink_target;
1620
1621 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, toName,
1622 info_buf_target,
1623 cifs_sb->local_nls,
1624 cifs_sb->mnt_cifs_flags &
1625 CIFS_MOUNT_MAP_SPECIAL_CHR);
1626
1627 if (tmprc == 0 && (info_buf_source->UniqueId ==
1628 info_buf_target->UniqueId)) {
1629 /* same file, POSIX says that this is a noop */
1630 rc = 0;
1631 goto cifs_rename_exit;
1632 }
1633 } /* else ... BB we could add the same check for Windows by
1634 checking the UniqueId via FILE_INTERNAL_INFO */
1635
1636 unlink_target:
1637 /* Try unlinking the target dentry if it's not negative */
1638 if (target_dentry->d_inode && (rc == -EACCES || rc == -EEXIST)) {
1639 tmprc = cifs_unlink(target_dir, target_dentry);
1640 if (tmprc)
1641 goto cifs_rename_exit;
1642
1643 rc = cifs_do_rename(xid, source_dentry, fromName,
1644 target_dentry, toName);
1645 }
1646
1647 cifs_rename_exit:
1648 kfree(info_buf_source);
1649 kfree(fromName);
1650 kfree(toName);
1651 FreeXid(xid);
1652 cifs_put_tlink(tlink);
1653 return rc;
1654 }
1655
1656 static bool
1657 cifs_inode_needs_reval(struct inode *inode)
1658 {
1659 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1660 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1661
1662 if (cifs_i->clientCanCacheRead)
1663 return false;
1664
1665 if (!lookupCacheEnabled)
1666 return true;
1667
1668 if (cifs_i->time == 0)
1669 return true;
1670
1671 if (!time_in_range(jiffies, cifs_i->time,
1672 cifs_i->time + cifs_sb->actimeo))
1673 return true;
1674
1675 /* hardlinked files w/ noserverino get "special" treatment */
1676 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
1677 S_ISREG(inode->i_mode) && inode->i_nlink != 1)
1678 return true;
1679
1680 return false;
1681 }
1682
1683 /*
1684 * Zap the cache. Called when invalid_mapping flag is set.
1685 */
1686 void
1687 cifs_invalidate_mapping(struct inode *inode)
1688 {
1689 int rc;
1690 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1691
1692 cifs_i->invalid_mapping = false;
1693
1694 /* write back any cached data */
1695 if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
1696 rc = filemap_write_and_wait(inode->i_mapping);
1697 mapping_set_error(inode->i_mapping, rc);
1698 }
1699 invalidate_remote_inode(inode);
1700 cifs_fscache_reset_inode_cookie(inode);
1701 }
1702
1703 int cifs_revalidate_file(struct file *filp)
1704 {
1705 int rc = 0;
1706 struct inode *inode = filp->f_path.dentry->d_inode;
1707 struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
1708
1709 if (!cifs_inode_needs_reval(inode))
1710 goto check_inval;
1711
1712 if (tlink_tcon(cfile->tlink)->unix_ext)
1713 rc = cifs_get_file_info_unix(filp);
1714 else
1715 rc = cifs_get_file_info(filp);
1716
1717 check_inval:
1718 if (CIFS_I(inode)->invalid_mapping)
1719 cifs_invalidate_mapping(inode);
1720
1721 return rc;
1722 }
1723
1724 /* revalidate a dentry's inode attributes */
1725 int cifs_revalidate_dentry(struct dentry *dentry)
1726 {
1727 int xid;
1728 int rc = 0;
1729 char *full_path = NULL;
1730 struct inode *inode = dentry->d_inode;
1731 struct super_block *sb = dentry->d_sb;
1732
1733 if (inode == NULL)
1734 return -ENOENT;
1735
1736 xid = GetXid();
1737
1738 if (!cifs_inode_needs_reval(inode))
1739 goto check_inval;
1740
1741 /* can not safely grab the rename sem here if rename calls revalidate
1742 since that would deadlock */
1743 full_path = build_path_from_dentry(dentry);
1744 if (full_path == NULL) {
1745 rc = -ENOMEM;
1746 goto check_inval;
1747 }
1748
1749 cFYI(1, "Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1750 "jiffies %ld", full_path, inode, inode->i_count.counter,
1751 dentry, dentry->d_time, jiffies);
1752
1753 if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
1754 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
1755 else
1756 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
1757 xid, NULL);
1758
1759 check_inval:
1760 if (CIFS_I(inode)->invalid_mapping)
1761 cifs_invalidate_mapping(inode);
1762
1763 kfree(full_path);
1764 FreeXid(xid);
1765 return rc;
1766 }
1767
1768 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1769 struct kstat *stat)
1770 {
1771 struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
1772 struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
1773 int err = cifs_revalidate_dentry(dentry);
1774
1775 if (!err) {
1776 generic_fillattr(dentry->d_inode, stat);
1777 stat->blksize = CIFS_MAX_MSGSIZE;
1778 stat->ino = CIFS_I(dentry->d_inode)->uniqueid;
1779
1780 /*
1781 * If on a multiuser mount without unix extensions, and the
1782 * admin hasn't overridden them, set the ownership to the
1783 * fsuid/fsgid of the current process.
1784 */
1785 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
1786 !tcon->unix_ext) {
1787 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
1788 stat->uid = current_fsuid();
1789 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
1790 stat->gid = current_fsgid();
1791 }
1792 }
1793 return err;
1794 }
1795
1796 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1797 {
1798 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1799 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1800 struct page *page;
1801 int rc = 0;
1802
1803 page = grab_cache_page(mapping, index);
1804 if (!page)
1805 return -ENOMEM;
1806
1807 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1808 unlock_page(page);
1809 page_cache_release(page);
1810 return rc;
1811 }
1812
1813 static void cifs_setsize(struct inode *inode, loff_t offset)
1814 {
1815 loff_t oldsize;
1816
1817 spin_lock(&inode->i_lock);
1818 oldsize = inode->i_size;
1819 i_size_write(inode, offset);
1820 spin_unlock(&inode->i_lock);
1821
1822 truncate_pagecache(inode, oldsize, offset);
1823 }
1824
1825 static int
1826 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1827 int xid, char *full_path)
1828 {
1829 int rc;
1830 struct cifsFileInfo *open_file;
1831 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1832 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1833 struct tcon_link *tlink = NULL;
1834 struct cifsTconInfo *pTcon = NULL;
1835
1836 /*
1837 * To avoid spurious oplock breaks from server, in the case of
1838 * inodes that we already have open, avoid doing path based
1839 * setting of file size if we can do it by handle.
1840 * This keeps our caching token (oplock) and avoids timeouts
1841 * when the local oplock break takes longer to flush
1842 * writebehind data than the SMB timeout for the SetPathInfo
1843 * request would allow
1844 */
1845 open_file = find_writable_file(cifsInode, true);
1846 if (open_file) {
1847 __u16 nfid = open_file->netfid;
1848 __u32 npid = open_file->pid;
1849 pTcon = tlink_tcon(open_file->tlink);
1850 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1851 npid, false);
1852 cifsFileInfo_put(open_file);
1853 cFYI(1, "SetFSize for attrs rc = %d", rc);
1854 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1855 unsigned int bytes_written;
1856 rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
1857 &bytes_written, NULL, NULL, 1);
1858 cFYI(1, "Wrt seteof rc %d", rc);
1859 }
1860 } else
1861 rc = -EINVAL;
1862
1863 if (rc != 0) {
1864 if (pTcon == NULL) {
1865 tlink = cifs_sb_tlink(cifs_sb);
1866 if (IS_ERR(tlink))
1867 return PTR_ERR(tlink);
1868 pTcon = tlink_tcon(tlink);
1869 }
1870
1871 /* Set file size by pathname rather than by handle
1872 either because no valid, writeable file handle for
1873 it was found or because there was an error setting
1874 it by handle */
1875 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1876 false, cifs_sb->local_nls,
1877 cifs_sb->mnt_cifs_flags &
1878 CIFS_MOUNT_MAP_SPECIAL_CHR);
1879 cFYI(1, "SetEOF by path (setattrs) rc = %d", rc);
1880 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1881 __u16 netfid;
1882 int oplock = 0;
1883
1884 rc = SMBLegacyOpen(xid, pTcon, full_path,
1885 FILE_OPEN, GENERIC_WRITE,
1886 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1887 cifs_sb->local_nls,
1888 cifs_sb->mnt_cifs_flags &
1889 CIFS_MOUNT_MAP_SPECIAL_CHR);
1890 if (rc == 0) {
1891 unsigned int bytes_written;
1892 rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
1893 attrs->ia_size,
1894 &bytes_written, NULL,
1895 NULL, 1);
1896 cFYI(1, "wrt seteof rc %d", rc);
1897 CIFSSMBClose(xid, pTcon, netfid);
1898 }
1899 }
1900 if (tlink)
1901 cifs_put_tlink(tlink);
1902 }
1903
1904 if (rc == 0) {
1905 cifsInode->server_eof = attrs->ia_size;
1906 cifs_setsize(inode, attrs->ia_size);
1907 cifs_truncate_page(inode->i_mapping, inode->i_size);
1908 }
1909
1910 return rc;
1911 }
1912
1913 static int
1914 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1915 {
1916 int rc;
1917 int xid;
1918 char *full_path = NULL;
1919 struct inode *inode = direntry->d_inode;
1920 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1921 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1922 struct tcon_link *tlink;
1923 struct cifsTconInfo *pTcon;
1924 struct cifs_unix_set_info_args *args = NULL;
1925 struct cifsFileInfo *open_file;
1926
1927 cFYI(1, "setattr_unix on file %s attrs->ia_valid=0x%x",
1928 direntry->d_name.name, attrs->ia_valid);
1929
1930 xid = GetXid();
1931
1932 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
1933 attrs->ia_valid |= ATTR_FORCE;
1934
1935 rc = inode_change_ok(inode, attrs);
1936 if (rc < 0)
1937 goto out;
1938
1939 full_path = build_path_from_dentry(direntry);
1940 if (full_path == NULL) {
1941 rc = -ENOMEM;
1942 goto out;
1943 }
1944
1945 /*
1946 * Attempt to flush data before changing attributes. We need to do
1947 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
1948 * ownership or mode then we may also need to do this. Here, we take
1949 * the safe way out and just do the flush on all setattr requests. If
1950 * the flush returns error, store it to report later and continue.
1951 *
1952 * BB: This should be smarter. Why bother flushing pages that
1953 * will be truncated anyway? Also, should we error out here if
1954 * the flush returns error?
1955 */
1956 rc = filemap_write_and_wait(inode->i_mapping);
1957 mapping_set_error(inode->i_mapping, rc);
1958 rc = 0;
1959
1960 if (attrs->ia_valid & ATTR_SIZE) {
1961 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1962 if (rc != 0)
1963 goto out;
1964 }
1965
1966 /* skip mode change if it's just for clearing setuid/setgid */
1967 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1968 attrs->ia_valid &= ~ATTR_MODE;
1969
1970 args = kmalloc(sizeof(*args), GFP_KERNEL);
1971 if (args == NULL) {
1972 rc = -ENOMEM;
1973 goto out;
1974 }
1975
1976 /* set up the struct */
1977 if (attrs->ia_valid & ATTR_MODE)
1978 args->mode = attrs->ia_mode;
1979 else
1980 args->mode = NO_CHANGE_64;
1981
1982 if (attrs->ia_valid & ATTR_UID)
1983 args->uid = attrs->ia_uid;
1984 else
1985 args->uid = NO_CHANGE_64;
1986
1987 if (attrs->ia_valid & ATTR_GID)
1988 args->gid = attrs->ia_gid;
1989 else
1990 args->gid = NO_CHANGE_64;
1991
1992 if (attrs->ia_valid & ATTR_ATIME)
1993 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
1994 else
1995 args->atime = NO_CHANGE_64;
1996
1997 if (attrs->ia_valid & ATTR_MTIME)
1998 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
1999 else
2000 args->mtime = NO_CHANGE_64;
2001
2002 if (attrs->ia_valid & ATTR_CTIME)
2003 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
2004 else
2005 args->ctime = NO_CHANGE_64;
2006
2007 args->device = 0;
2008 open_file = find_writable_file(cifsInode, true);
2009 if (open_file) {
2010 u16 nfid = open_file->netfid;
2011 u32 npid = open_file->pid;
2012 pTcon = tlink_tcon(open_file->tlink);
2013 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
2014 cifsFileInfo_put(open_file);
2015 } else {
2016 tlink = cifs_sb_tlink(cifs_sb);
2017 if (IS_ERR(tlink)) {
2018 rc = PTR_ERR(tlink);
2019 goto out;
2020 }
2021 pTcon = tlink_tcon(tlink);
2022 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
2023 cifs_sb->local_nls,
2024 cifs_sb->mnt_cifs_flags &
2025 CIFS_MOUNT_MAP_SPECIAL_CHR);
2026 cifs_put_tlink(tlink);
2027 }
2028
2029 if (rc)
2030 goto out;
2031
2032 if ((attrs->ia_valid & ATTR_SIZE) &&
2033 attrs->ia_size != i_size_read(inode))
2034 truncate_setsize(inode, attrs->ia_size);
2035
2036 setattr_copy(inode, attrs);
2037 mark_inode_dirty(inode);
2038
2039 /* force revalidate when any of these times are set since some
2040 of the fs types (eg ext3, fat) do not have fine enough
2041 time granularity to match protocol, and we do not have a
2042 a way (yet) to query the server fs's time granularity (and
2043 whether it rounds times down).
2044 */
2045 if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
2046 cifsInode->time = 0;
2047 out:
2048 kfree(args);
2049 kfree(full_path);
2050 FreeXid(xid);
2051 return rc;
2052 }
2053
2054 static int
2055 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
2056 {
2057 int xid;
2058 struct inode *inode = direntry->d_inode;
2059 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2060 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2061 char *full_path = NULL;
2062 int rc = -EACCES;
2063 __u32 dosattr = 0;
2064 __u64 mode = NO_CHANGE_64;
2065
2066 xid = GetXid();
2067
2068 cFYI(1, "setattr on file %s attrs->iavalid 0x%x",
2069 direntry->d_name.name, attrs->ia_valid);
2070
2071 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2072 attrs->ia_valid |= ATTR_FORCE;
2073
2074 rc = inode_change_ok(inode, attrs);
2075 if (rc < 0) {
2076 FreeXid(xid);
2077 return rc;
2078 }
2079
2080 full_path = build_path_from_dentry(direntry);
2081 if (full_path == NULL) {
2082 rc = -ENOMEM;
2083 FreeXid(xid);
2084 return rc;
2085 }
2086
2087 /*
2088 * Attempt to flush data before changing attributes. We need to do
2089 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2090 * ownership or mode then we may also need to do this. Here, we take
2091 * the safe way out and just do the flush on all setattr requests. If
2092 * the flush returns error, store it to report later and continue.
2093 *
2094 * BB: This should be smarter. Why bother flushing pages that
2095 * will be truncated anyway? Also, should we error out here if
2096 * the flush returns error?
2097 */
2098 rc = filemap_write_and_wait(inode->i_mapping);
2099 mapping_set_error(inode->i_mapping, rc);
2100 rc = 0;
2101
2102 if (attrs->ia_valid & ATTR_SIZE) {
2103 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2104 if (rc != 0)
2105 goto cifs_setattr_exit;
2106 }
2107
2108 /*
2109 * Without unix extensions we can't send ownership changes to the
2110 * server, so silently ignore them. This is consistent with how
2111 * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
2112 * CIFSACL support + proper Windows to Unix idmapping, we may be
2113 * able to support this in the future.
2114 */
2115 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
2116 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
2117
2118 /* skip mode change if it's just for clearing setuid/setgid */
2119 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2120 attrs->ia_valid &= ~ATTR_MODE;
2121
2122 if (attrs->ia_valid & ATTR_MODE) {
2123 cFYI(1, "Mode changed to 0%o", attrs->ia_mode);
2124 mode = attrs->ia_mode;
2125 }
2126
2127 if (attrs->ia_valid & ATTR_MODE) {
2128 rc = 0;
2129 #ifdef CONFIG_CIFS_ACL
2130 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2131 rc = mode_to_cifs_acl(inode, full_path, mode);
2132 if (rc) {
2133 cFYI(1, "%s: Setting ACL failed with error: %d",
2134 __func__, rc);
2135 goto cifs_setattr_exit;
2136 }
2137 } else
2138 #endif /* CONFIG_CIFS_ACL */
2139 if (((mode & S_IWUGO) == 0) &&
2140 (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
2141
2142 dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
2143
2144 /* fix up mode if we're not using dynperm */
2145 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
2146 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
2147 } else if ((mode & S_IWUGO) &&
2148 (cifsInode->cifsAttrs & ATTR_READONLY)) {
2149
2150 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
2151 /* Attributes of 0 are ignored */
2152 if (dosattr == 0)
2153 dosattr |= ATTR_NORMAL;
2154
2155 /* reset local inode permissions to normal */
2156 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2157 attrs->ia_mode &= ~(S_IALLUGO);
2158 if (S_ISDIR(inode->i_mode))
2159 attrs->ia_mode |=
2160 cifs_sb->mnt_dir_mode;
2161 else
2162 attrs->ia_mode |=
2163 cifs_sb->mnt_file_mode;
2164 }
2165 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2166 /* ignore mode change - ATTR_READONLY hasn't changed */
2167 attrs->ia_valid &= ~ATTR_MODE;
2168 }
2169 }
2170
2171 if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
2172 ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
2173 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
2174 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
2175
2176 /* Even if error on time set, no sense failing the call if
2177 the server would set the time to a reasonable value anyway,
2178 and this check ensures that we are not being called from
2179 sys_utimes in which case we ought to fail the call back to
2180 the user when the server rejects the call */
2181 if ((rc) && (attrs->ia_valid &
2182 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
2183 rc = 0;
2184 }
2185
2186 /* do not need local check to inode_check_ok since the server does
2187 that */
2188 if (rc)
2189 goto cifs_setattr_exit;
2190
2191 if ((attrs->ia_valid & ATTR_SIZE) &&
2192 attrs->ia_size != i_size_read(inode))
2193 truncate_setsize(inode, attrs->ia_size);
2194
2195 setattr_copy(inode, attrs);
2196 mark_inode_dirty(inode);
2197
2198 cifs_setattr_exit:
2199 kfree(full_path);
2200 FreeXid(xid);
2201 return rc;
2202 }
2203
2204 int
2205 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
2206 {
2207 struct inode *inode = direntry->d_inode;
2208 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2209 struct cifsTconInfo *pTcon = cifs_sb_master_tcon(cifs_sb);
2210
2211 if (pTcon->unix_ext)
2212 return cifs_setattr_unix(direntry, attrs);
2213
2214 return cifs_setattr_nounix(direntry, attrs);
2215
2216 /* BB: add cifs_setattr_legacy for really old servers */
2217 }
2218
2219 #if 0
2220 void cifs_delete_inode(struct inode *inode)
2221 {
2222 cFYI(1, "In cifs_delete_inode, inode = 0x%p", inode);
2223 /* may have to add back in if and when safe distributed caching of
2224 directories added e.g. via FindNotify */
2225 }
2226 #endif
Linux kernel - Deliverables
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