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CIFS: Simplify invalidate part (try #5)
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / cifs / inode.c
blob0cc7eddb077fef5e23d8bbd07bf815cec2bda00b
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)
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 int
1687 cifs_invalidate_mapping(struct inode *inode)
1688 {
1689 int rc = 0;
1690 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1691
1692 cifs_i->invalid_mapping = false;
1693
1694 if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
1695 rc = invalidate_inode_pages2(inode->i_mapping);
1696 if (rc) {
1697 cERROR(1, "%s: could not invalidate inode %p", __func__,
1698 inode);
1699 cifs_i->invalid_mapping = true;
1700 }
1701 }
1702
1703 cifs_fscache_reset_inode_cookie(inode);
1704 return rc;
1705 }
1706
1707 int cifs_revalidate_file_attr(struct file *filp)
1708 {
1709 int rc = 0;
1710 struct inode *inode = filp->f_path.dentry->d_inode;
1711 struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
1712
1713 if (!cifs_inode_needs_reval(inode))
1714 return rc;
1715
1716 if (tlink_tcon(cfile->tlink)->unix_ext)
1717 rc = cifs_get_file_info_unix(filp);
1718 else
1719 rc = cifs_get_file_info(filp);
1720
1721 return rc;
1722 }
1723
1724 int cifs_revalidate_dentry_attr(struct dentry *dentry)
1725 {
1726 int xid;
1727 int rc = 0;
1728 struct inode *inode = dentry->d_inode;
1729 struct super_block *sb = dentry->d_sb;
1730 char *full_path = NULL;
1731
1732 if (inode == NULL)
1733 return -ENOENT;
1734
1735 if (!cifs_inode_needs_reval(inode))
1736 return rc;
1737
1738 xid = GetXid();
1739
1740 /* can not safely grab the rename sem here if rename calls revalidate
1741 since that would deadlock */
1742 full_path = build_path_from_dentry(dentry);
1743 if (full_path == NULL) {
1744 rc = -ENOMEM;
1745 goto out;
1746 }
1747
1748 cFYI(1, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time "
1749 "%ld jiffies %ld", full_path, inode, inode->i_count.counter,
1750 dentry, dentry->d_time, jiffies);
1751
1752 if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
1753 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
1754 else
1755 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
1756 xid, NULL);
1757
1758 out:
1759 kfree(full_path);
1760 FreeXid(xid);
1761 return rc;
1762 }
1763
1764 int cifs_revalidate_file(struct file *filp)
1765 {
1766 int rc;
1767 struct inode *inode = filp->f_path.dentry->d_inode;
1768
1769 rc = cifs_revalidate_file_attr(filp);
1770 if (rc)
1771 return rc;
1772
1773 if (CIFS_I(inode)->invalid_mapping)
1774 rc = cifs_invalidate_mapping(inode);
1775 return rc;
1776 }
1777
1778 /* revalidate a dentry's inode attributes */
1779 int cifs_revalidate_dentry(struct dentry *dentry)
1780 {
1781 int rc;
1782 struct inode *inode = dentry->d_inode;
1783
1784 rc = cifs_revalidate_dentry_attr(dentry);
1785 if (rc)
1786 return rc;
1787
1788 if (CIFS_I(inode)->invalid_mapping)
1789 rc = cifs_invalidate_mapping(inode);
1790 return rc;
1791 }
1792
1793 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1794 struct kstat *stat)
1795 {
1796 struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
1797 struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
1798 struct inode *inode = dentry->d_inode;
1799 int rc;
1800
1801 /*
1802 * We need to be sure that all dirty pages are written and the server
1803 * has actual ctime, mtime and file length.
1804 */
1805 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
1806 inode->i_mapping->nrpages != 0) {
1807 rc = filemap_fdatawait(inode->i_mapping);
1808 mapping_set_error(inode->i_mapping, rc);
1809 return rc;
1810 }
1811
1812 rc = cifs_revalidate_dentry_attr(dentry);
1813 if (rc)
1814 return rc;
1815
1816 generic_fillattr(inode, stat);
1817 stat->blksize = CIFS_MAX_MSGSIZE;
1818 stat->ino = CIFS_I(inode)->uniqueid;
1819
1820 /*
1821 * If on a multiuser mount without unix extensions, and the admin hasn't
1822 * overridden them, set the ownership to the fsuid/fsgid of the current
1823 * process.
1824 */
1825 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
1826 !tcon->unix_ext) {
1827 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
1828 stat->uid = current_fsuid();
1829 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
1830 stat->gid = current_fsgid();
1831 }
1832 return rc;
1833 }
1834
1835 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1836 {
1837 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1838 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1839 struct page *page;
1840 int rc = 0;
1841
1842 page = grab_cache_page(mapping, index);
1843 if (!page)
1844 return -ENOMEM;
1845
1846 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1847 unlock_page(page);
1848 page_cache_release(page);
1849 return rc;
1850 }
1851
1852 static void cifs_setsize(struct inode *inode, loff_t offset)
1853 {
1854 loff_t oldsize;
1855
1856 spin_lock(&inode->i_lock);
1857 oldsize = inode->i_size;
1858 i_size_write(inode, offset);
1859 spin_unlock(&inode->i_lock);
1860
1861 truncate_pagecache(inode, oldsize, offset);
1862 }
1863
1864 static int
1865 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1866 int xid, char *full_path)
1867 {
1868 int rc;
1869 struct cifsFileInfo *open_file;
1870 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1871 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1872 struct tcon_link *tlink = NULL;
1873 struct cifsTconInfo *pTcon = NULL;
1874
1875 /*
1876 * To avoid spurious oplock breaks from server, in the case of
1877 * inodes that we already have open, avoid doing path based
1878 * setting of file size if we can do it by handle.
1879 * This keeps our caching token (oplock) and avoids timeouts
1880 * when the local oplock break takes longer to flush
1881 * writebehind data than the SMB timeout for the SetPathInfo
1882 * request would allow
1883 */
1884 open_file = find_writable_file(cifsInode, true);
1885 if (open_file) {
1886 __u16 nfid = open_file->netfid;
1887 __u32 npid = open_file->pid;
1888 pTcon = tlink_tcon(open_file->tlink);
1889 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1890 npid, false);
1891 cifsFileInfo_put(open_file);
1892 cFYI(1, "SetFSize for attrs rc = %d", rc);
1893 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1894 unsigned int bytes_written;
1895 rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
1896 &bytes_written, NULL, NULL, 1);
1897 cFYI(1, "Wrt seteof rc %d", rc);
1898 }
1899 } else
1900 rc = -EINVAL;
1901
1902 if (rc != 0) {
1903 if (pTcon == NULL) {
1904 tlink = cifs_sb_tlink(cifs_sb);
1905 if (IS_ERR(tlink))
1906 return PTR_ERR(tlink);
1907 pTcon = tlink_tcon(tlink);
1908 }
1909
1910 /* Set file size by pathname rather than by handle
1911 either because no valid, writeable file handle for
1912 it was found or because there was an error setting
1913 it by handle */
1914 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1915 false, cifs_sb->local_nls,
1916 cifs_sb->mnt_cifs_flags &
1917 CIFS_MOUNT_MAP_SPECIAL_CHR);
1918 cFYI(1, "SetEOF by path (setattrs) rc = %d", rc);
1919 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1920 __u16 netfid;
1921 int oplock = 0;
1922
1923 rc = SMBLegacyOpen(xid, pTcon, full_path,
1924 FILE_OPEN, GENERIC_WRITE,
1925 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1926 cifs_sb->local_nls,
1927 cifs_sb->mnt_cifs_flags &
1928 CIFS_MOUNT_MAP_SPECIAL_CHR);
1929 if (rc == 0) {
1930 unsigned int bytes_written;
1931 rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
1932 attrs->ia_size,
1933 &bytes_written, NULL,
1934 NULL, 1);
1935 cFYI(1, "wrt seteof rc %d", rc);
1936 CIFSSMBClose(xid, pTcon, netfid);
1937 }
1938 }
1939 if (tlink)
1940 cifs_put_tlink(tlink);
1941 }
1942
1943 if (rc == 0) {
1944 cifsInode->server_eof = attrs->ia_size;
1945 cifs_setsize(inode, attrs->ia_size);
1946 cifs_truncate_page(inode->i_mapping, inode->i_size);
1947 }
1948
1949 return rc;
1950 }
1951
1952 static int
1953 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1954 {
1955 int rc;
1956 int xid;
1957 char *full_path = NULL;
1958 struct inode *inode = direntry->d_inode;
1959 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1960 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1961 struct tcon_link *tlink;
1962 struct cifsTconInfo *pTcon;
1963 struct cifs_unix_set_info_args *args = NULL;
1964 struct cifsFileInfo *open_file;
1965
1966 cFYI(1, "setattr_unix on file %s attrs->ia_valid=0x%x",
1967 direntry->d_name.name, attrs->ia_valid);
1968
1969 xid = GetXid();
1970
1971 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
1972 attrs->ia_valid |= ATTR_FORCE;
1973
1974 rc = inode_change_ok(inode, attrs);
1975 if (rc < 0)
1976 goto out;
1977
1978 full_path = build_path_from_dentry(direntry);
1979 if (full_path == NULL) {
1980 rc = -ENOMEM;
1981 goto out;
1982 }
1983
1984 /*
1985 * Attempt to flush data before changing attributes. We need to do
1986 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
1987 * ownership or mode then we may also need to do this. Here, we take
1988 * the safe way out and just do the flush on all setattr requests. If
1989 * the flush returns error, store it to report later and continue.
1990 *
1991 * BB: This should be smarter. Why bother flushing pages that
1992 * will be truncated anyway? Also, should we error out here if
1993 * the flush returns error?
1994 */
1995 rc = filemap_write_and_wait(inode->i_mapping);
1996 mapping_set_error(inode->i_mapping, rc);
1997 rc = 0;
1998
1999 if (attrs->ia_valid & ATTR_SIZE) {
2000 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2001 if (rc != 0)
2002 goto out;
2003 }
2004
2005 /* skip mode change if it's just for clearing setuid/setgid */
2006 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2007 attrs->ia_valid &= ~ATTR_MODE;
2008
2009 args = kmalloc(sizeof(*args), GFP_KERNEL);
2010 if (args == NULL) {
2011 rc = -ENOMEM;
2012 goto out;
2013 }
2014
2015 /* set up the struct */
2016 if (attrs->ia_valid & ATTR_MODE)
2017 args->mode = attrs->ia_mode;
2018 else
2019 args->mode = NO_CHANGE_64;
2020
2021 if (attrs->ia_valid & ATTR_UID)
2022 args->uid = attrs->ia_uid;
2023 else
2024 args->uid = NO_CHANGE_64;
2025
2026 if (attrs->ia_valid & ATTR_GID)
2027 args->gid = attrs->ia_gid;
2028 else
2029 args->gid = NO_CHANGE_64;
2030
2031 if (attrs->ia_valid & ATTR_ATIME)
2032 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
2033 else
2034 args->atime = NO_CHANGE_64;
2035
2036 if (attrs->ia_valid & ATTR_MTIME)
2037 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
2038 else
2039 args->mtime = NO_CHANGE_64;
2040
2041 if (attrs->ia_valid & ATTR_CTIME)
2042 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
2043 else
2044 args->ctime = NO_CHANGE_64;
2045
2046 args->device = 0;
2047 open_file = find_writable_file(cifsInode, true);
2048 if (open_file) {
2049 u16 nfid = open_file->netfid;
2050 u32 npid = open_file->pid;
2051 pTcon = tlink_tcon(open_file->tlink);
2052 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
2053 cifsFileInfo_put(open_file);
2054 } else {
2055 tlink = cifs_sb_tlink(cifs_sb);
2056 if (IS_ERR(tlink)) {
2057 rc = PTR_ERR(tlink);
2058 goto out;
2059 }
2060 pTcon = tlink_tcon(tlink);
2061 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
2062 cifs_sb->local_nls,
2063 cifs_sb->mnt_cifs_flags &
2064 CIFS_MOUNT_MAP_SPECIAL_CHR);
2065 cifs_put_tlink(tlink);
2066 }
2067
2068 if (rc)
2069 goto out;
2070
2071 if ((attrs->ia_valid & ATTR_SIZE) &&
2072 attrs->ia_size != i_size_read(inode))
2073 truncate_setsize(inode, attrs->ia_size);
2074
2075 setattr_copy(inode, attrs);
2076 mark_inode_dirty(inode);
2077
2078 /* force revalidate when any of these times are set since some
2079 of the fs types (eg ext3, fat) do not have fine enough
2080 time granularity to match protocol, and we do not have a
2081 a way (yet) to query the server fs's time granularity (and
2082 whether it rounds times down).
2083 */
2084 if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
2085 cifsInode->time = 0;
2086 out:
2087 kfree(args);
2088 kfree(full_path);
2089 FreeXid(xid);
2090 return rc;
2091 }
2092
2093 static int
2094 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
2095 {
2096 int xid;
2097 struct inode *inode = direntry->d_inode;
2098 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2099 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2100 char *full_path = NULL;
2101 int rc = -EACCES;
2102 __u32 dosattr = 0;
2103 __u64 mode = NO_CHANGE_64;
2104
2105 xid = GetXid();
2106
2107 cFYI(1, "setattr on file %s attrs->iavalid 0x%x",
2108 direntry->d_name.name, attrs->ia_valid);
2109
2110 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2111 attrs->ia_valid |= ATTR_FORCE;
2112
2113 rc = inode_change_ok(inode, attrs);
2114 if (rc < 0) {
2115 FreeXid(xid);
2116 return rc;
2117 }
2118
2119 full_path = build_path_from_dentry(direntry);
2120 if (full_path == NULL) {
2121 rc = -ENOMEM;
2122 FreeXid(xid);
2123 return rc;
2124 }
2125
2126 /*
2127 * Attempt to flush data before changing attributes. We need to do
2128 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2129 * ownership or mode then we may also need to do this. Here, we take
2130 * the safe way out and just do the flush on all setattr requests. If
2131 * the flush returns error, store it to report later and continue.
2132 *
2133 * BB: This should be smarter. Why bother flushing pages that
2134 * will be truncated anyway? Also, should we error out here if
2135 * the flush returns error?
2136 */
2137 rc = filemap_write_and_wait(inode->i_mapping);
2138 mapping_set_error(inode->i_mapping, rc);
2139 rc = 0;
2140
2141 if (attrs->ia_valid & ATTR_SIZE) {
2142 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2143 if (rc != 0)
2144 goto cifs_setattr_exit;
2145 }
2146
2147 /*
2148 * Without unix extensions we can't send ownership changes to the
2149 * server, so silently ignore them. This is consistent with how
2150 * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
2151 * CIFSACL support + proper Windows to Unix idmapping, we may be
2152 * able to support this in the future.
2153 */
2154 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
2155 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
2156
2157 /* skip mode change if it's just for clearing setuid/setgid */
2158 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2159 attrs->ia_valid &= ~ATTR_MODE;
2160
2161 if (attrs->ia_valid & ATTR_MODE) {
2162 cFYI(1, "Mode changed to 0%o", attrs->ia_mode);
2163 mode = attrs->ia_mode;
2164 }
2165
2166 if (attrs->ia_valid & ATTR_MODE) {
2167 rc = 0;
2168 #ifdef CONFIG_CIFS_ACL
2169 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2170 rc = mode_to_cifs_acl(inode, full_path, mode);
2171 if (rc) {
2172 cFYI(1, "%s: Setting ACL failed with error: %d",
2173 __func__, rc);
2174 goto cifs_setattr_exit;
2175 }
2176 } else
2177 #endif /* CONFIG_CIFS_ACL */
2178 if (((mode & S_IWUGO) == 0) &&
2179 (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
2180
2181 dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
2182
2183 /* fix up mode if we're not using dynperm */
2184 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
2185 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
2186 } else if ((mode & S_IWUGO) &&
2187 (cifsInode->cifsAttrs & ATTR_READONLY)) {
2188
2189 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
2190 /* Attributes of 0 are ignored */
2191 if (dosattr == 0)
2192 dosattr |= ATTR_NORMAL;
2193
2194 /* reset local inode permissions to normal */
2195 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2196 attrs->ia_mode &= ~(S_IALLUGO);
2197 if (S_ISDIR(inode->i_mode))
2198 attrs->ia_mode |=
2199 cifs_sb->mnt_dir_mode;
2200 else
2201 attrs->ia_mode |=
2202 cifs_sb->mnt_file_mode;
2203 }
2204 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2205 /* ignore mode change - ATTR_READONLY hasn't changed */
2206 attrs->ia_valid &= ~ATTR_MODE;
2207 }
2208 }
2209
2210 if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
2211 ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
2212 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
2213 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
2214
2215 /* Even if error on time set, no sense failing the call if
2216 the server would set the time to a reasonable value anyway,
2217 and this check ensures that we are not being called from
2218 sys_utimes in which case we ought to fail the call back to
2219 the user when the server rejects the call */
2220 if ((rc) && (attrs->ia_valid &
2221 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
2222 rc = 0;
2223 }
2224
2225 /* do not need local check to inode_check_ok since the server does
2226 that */
2227 if (rc)
2228 goto cifs_setattr_exit;
2229
2230 if ((attrs->ia_valid & ATTR_SIZE) &&
2231 attrs->ia_size != i_size_read(inode))
2232 truncate_setsize(inode, attrs->ia_size);
2233
2234 setattr_copy(inode, attrs);
2235 mark_inode_dirty(inode);
2236
2237 cifs_setattr_exit:
2238 kfree(full_path);
2239 FreeXid(xid);
2240 return rc;
2241 }
2242
2243 int
2244 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
2245 {
2246 struct inode *inode = direntry->d_inode;
2247 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2248 struct cifsTconInfo *pTcon = cifs_sb_master_tcon(cifs_sb);
2249
2250 if (pTcon->unix_ext)
2251 return cifs_setattr_unix(direntry, attrs);
2252
2253 return cifs_setattr_nounix(direntry, attrs);
2254
2255 /* BB: add cifs_setattr_legacy for really old servers */
2256 }
2257
2258 #if 0
2259 void cifs_delete_inode(struct inode *inode)
2260 {
2261 cFYI(1, "In cifs_delete_inode, inode = 0x%p", inode);
2262 /* may have to add back in if and when safe distributed caching of
2263 directories added e.g. via FindNotify */
2264 }
2265 #endif
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree