projects / linux-2.6-block.git / blame_incremental
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (non-incremental) | history | HEAD
Merge branch 'for_rmk' of git://git.mnementh.co.uk/linux-2.6-im into devel
[linux-2.6-block.git] / fs / cifs / inode.c
... / ...
CommitLineData
1/*
2 * fs/cifs/inode.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2007
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/pagemap.h>
24#include <asm/div64.h>
25#include "cifsfs.h"
26#include "cifspdu.h"
27#include "cifsglob.h"
28#include "cifsproto.h"
29#include "cifs_debug.h"
30#include "cifs_fs_sb.h"
31
32
33static void cifs_set_ops(struct inode *inode, const bool is_dfs_referral)
34{
35 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
36
37 switch (inode->i_mode & S_IFMT) {
38 case S_IFREG:
39 inode->i_op = &cifs_file_inode_ops;
40 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
41 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
42 inode->i_fop = &cifs_file_direct_nobrl_ops;
43 else
44 inode->i_fop = &cifs_file_direct_ops;
45 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
46 inode->i_fop = &cifs_file_nobrl_ops;
47 else { /* not direct, send byte range locks */
48 inode->i_fop = &cifs_file_ops;
49 }
50
51
52 /* check if server can support readpages */
53 if (cifs_sb->tcon->ses->server->maxBuf <
54 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
55 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
56 else
57 inode->i_data.a_ops = &cifs_addr_ops;
58 break;
59 case S_IFDIR:
60#ifdef CONFIG_CIFS_DFS_UPCALL
61 if (is_dfs_referral) {
62 inode->i_op = &cifs_dfs_referral_inode_operations;
63 } else {
64#else /* NO DFS support, treat as a directory */
65 {
66#endif
67 inode->i_op = &cifs_dir_inode_ops;
68 inode->i_fop = &cifs_dir_ops;
69 }
70 break;
71 case S_IFLNK:
72 inode->i_op = &cifs_symlink_inode_ops;
73 break;
74 default:
75 init_special_inode(inode, inode->i_mode, inode->i_rdev);
76 break;
77 }
78}
79
80static void cifs_unix_info_to_inode(struct inode *inode,
81 FILE_UNIX_BASIC_INFO *info, int force_uid_gid)
82{
83 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
84 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
85 __u64 num_of_bytes = le64_to_cpu(info->NumOfBytes);
86 __u64 end_of_file = le64_to_cpu(info->EndOfFile);
87
88 inode->i_atime = cifs_NTtimeToUnix(le64_to_cpu(info->LastAccessTime));
89 inode->i_mtime =
90 cifs_NTtimeToUnix(le64_to_cpu(info->LastModificationTime));
91 inode->i_ctime = cifs_NTtimeToUnix(le64_to_cpu(info->LastStatusChange));
92 inode->i_mode = le64_to_cpu(info->Permissions);
93
94 /*
95 * Since we set the inode type below we need to mask off
96 * to avoid strange results if bits set above.
97 */
98 inode->i_mode &= ~S_IFMT;
99 switch (le32_to_cpu(info->Type)) {
100 case UNIX_FILE:
101 inode->i_mode |= S_IFREG;
102 break;
103 case UNIX_SYMLINK:
104 inode->i_mode |= S_IFLNK;
105 break;
106 case UNIX_DIR:
107 inode->i_mode |= S_IFDIR;
108 break;
109 case UNIX_CHARDEV:
110 inode->i_mode |= S_IFCHR;
111 inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
112 le64_to_cpu(info->DevMinor) & MINORMASK);
113 break;
114 case UNIX_BLOCKDEV:
115 inode->i_mode |= S_IFBLK;
116 inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
117 le64_to_cpu(info->DevMinor) & MINORMASK);
118 break;
119 case UNIX_FIFO:
120 inode->i_mode |= S_IFIFO;
121 break;
122 case UNIX_SOCKET:
123 inode->i_mode |= S_IFSOCK;
124 break;
125 default:
126 /* safest to call it a file if we do not know */
127 inode->i_mode |= S_IFREG;
128 cFYI(1, ("unknown type %d", le32_to_cpu(info->Type)));
129 break;
130 }
131
132 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) &&
133 !force_uid_gid)
134 inode->i_uid = cifs_sb->mnt_uid;
135 else
136 inode->i_uid = le64_to_cpu(info->Uid);
137
138 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) &&
139 !force_uid_gid)
140 inode->i_gid = cifs_sb->mnt_gid;
141 else
142 inode->i_gid = le64_to_cpu(info->Gid);
143
144 inode->i_nlink = le64_to_cpu(info->Nlinks);
145
146 spin_lock(&inode->i_lock);
147 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
148 /*
149 * We can not safely change the file size here if the client
150 * is writing to it due to potential races.
151 */
152 i_size_write(inode, end_of_file);
153
154 /*
155 * i_blocks is not related to (i_size / i_blksize),
156 * but instead 512 byte (2**9) size is required for
157 * calculating num blocks.
158 */
159 inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
160 }
161 spin_unlock(&inode->i_lock);
162}
163
164
165/*
166 * Needed to setup inode data for the directory which is the
167 * junction to the new submount (ie to setup the fake directory
168 * which represents a DFS referral)
169 */
170static void fill_fake_finddataunix(FILE_UNIX_BASIC_INFO *pfnd_dat,
171 struct super_block *sb)
172{
173 struct inode *pinode = NULL;
174
175 memset(pfnd_dat, 0, sizeof(FILE_UNIX_BASIC_INFO));
176
177/* __le64 pfnd_dat->EndOfFile = cpu_to_le64(0);
178 __le64 pfnd_dat->NumOfBytes = cpu_to_le64(0);
179 __u64 UniqueId = 0; */
180 pfnd_dat->LastStatusChange =
181 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
182 pfnd_dat->LastAccessTime =
183 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
184 pfnd_dat->LastModificationTime =
185 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
186 pfnd_dat->Type = cpu_to_le32(UNIX_DIR);
187 pfnd_dat->Permissions = cpu_to_le64(S_IXUGO | S_IRWXU);
188 pfnd_dat->Nlinks = cpu_to_le64(2);
189 if (sb->s_root)
190 pinode = sb->s_root->d_inode;
191 if (pinode == NULL)
192 return;
193
194 /* fill in default values for the remaining based on root
195 inode since we can not query the server for this inode info */
196 pfnd_dat->DevMajor = cpu_to_le64(MAJOR(pinode->i_rdev));
197 pfnd_dat->DevMinor = cpu_to_le64(MINOR(pinode->i_rdev));
198 pfnd_dat->Uid = cpu_to_le64(pinode->i_uid);
199 pfnd_dat->Gid = cpu_to_le64(pinode->i_gid);
200}
201
202int cifs_get_inode_info_unix(struct inode **pinode,
203 const unsigned char *full_path, struct super_block *sb, int xid)
204{
205 int rc = 0;
206 FILE_UNIX_BASIC_INFO find_data;
207 struct cifsTconInfo *pTcon;
208 struct inode *inode;
209 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
210 bool is_dfs_referral = false;
211 struct cifsInodeInfo *cifsInfo;
212 __u64 num_of_bytes;
213 __u64 end_of_file;
214
215 pTcon = cifs_sb->tcon;
216 cFYI(1, ("Getting info on %s", full_path));
217
218 /* could have done a find first instead but this returns more info */
219 rc = CIFSSMBUnixQPathInfo(xid, pTcon, full_path, &find_data,
220 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
221 CIFS_MOUNT_MAP_SPECIAL_CHR);
222 if (rc == -EREMOTE && !is_dfs_referral) {
223 is_dfs_referral = true;
224 cFYI(DBG2, ("DFS ref"));
225 /* for DFS, server does not give us real inode data */
226 fill_fake_finddataunix(&find_data, sb);
227 rc = 0;
228 } else if (rc)
229 goto cgiiu_exit;
230
231 num_of_bytes = le64_to_cpu(find_data.NumOfBytes);
232 end_of_file = le64_to_cpu(find_data.EndOfFile);
233
234 /* get new inode */
235 if (*pinode == NULL) {
236 *pinode = new_inode(sb);
237 if (*pinode == NULL) {
238 rc = -ENOMEM;
239 goto cgiiu_exit;
240 }
241 /* Is an i_ino of zero legal? */
242 /* note ino incremented to unique num in new_inode */
243 /* Are there sanity checks we can use to ensure that
244 the server is really filling in that field? */
245 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
246 (*pinode)->i_ino = (unsigned long)find_data.UniqueId;
247
248 if (sb->s_flags & MS_NOATIME)
249 (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
250
251 insert_inode_hash(*pinode);
252 }
253
254 inode = *pinode;
255 cifsInfo = CIFS_I(inode);
256
257 cFYI(1, ("Old time %ld", cifsInfo->time));
258 cifsInfo->time = jiffies;
259 cFYI(1, ("New time %ld", cifsInfo->time));
260 /* this is ok to set on every inode revalidate */
261 atomic_set(&cifsInfo->inUse, 1);
262
263 cifs_unix_info_to_inode(inode, &find_data, 0);
264
265 if (num_of_bytes < end_of_file)
266 cFYI(1, ("allocation size less than end of file"));
267 cFYI(1, ("Size %ld and blocks %llu",
268 (unsigned long) inode->i_size,
269 (unsigned long long)inode->i_blocks));
270
271 cifs_set_ops(inode, is_dfs_referral);
272cgiiu_exit:
273 return rc;
274}
275
276static int decode_sfu_inode(struct inode *inode, __u64 size,
277 const unsigned char *path,
278 struct cifs_sb_info *cifs_sb, int xid)
279{
280 int rc;
281 int oplock = 0;
282 __u16 netfid;
283 struct cifsTconInfo *pTcon = cifs_sb->tcon;
284 char buf[24];
285 unsigned int bytes_read;
286 char *pbuf;
287
288 pbuf = buf;
289
290 if (size == 0) {
291 inode->i_mode |= S_IFIFO;
292 return 0;
293 } else if (size < 8) {
294 return -EINVAL; /* EOPNOTSUPP? */
295 }
296
297 rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
298 CREATE_NOT_DIR, &netfid, &oplock, NULL,
299 cifs_sb->local_nls,
300 cifs_sb->mnt_cifs_flags &
301 CIFS_MOUNT_MAP_SPECIAL_CHR);
302 if (rc == 0) {
303 int buf_type = CIFS_NO_BUFFER;
304 /* Read header */
305 rc = CIFSSMBRead(xid, pTcon,
306 netfid,
307 24 /* length */, 0 /* offset */,
308 &bytes_read, &pbuf, &buf_type);
309 if ((rc == 0) && (bytes_read >= 8)) {
310 if (memcmp("IntxBLK", pbuf, 8) == 0) {
311 cFYI(1, ("Block device"));
312 inode->i_mode |= S_IFBLK;
313 if (bytes_read == 24) {
314 /* we have enough to decode dev num */
315 __u64 mjr; /* major */
316 __u64 mnr; /* minor */
317 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
318 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
319 inode->i_rdev = MKDEV(mjr, mnr);
320 }
321 } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
322 cFYI(1, ("Char device"));
323 inode->i_mode |= S_IFCHR;
324 if (bytes_read == 24) {
325 /* we have enough to decode dev num */
326 __u64 mjr; /* major */
327 __u64 mnr; /* minor */
328 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
329 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
330 inode->i_rdev = MKDEV(mjr, mnr);
331 }
332 } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
333 cFYI(1, ("Symlink"));
334 inode->i_mode |= S_IFLNK;
335 } else {
336 inode->i_mode |= S_IFREG; /* file? */
337 rc = -EOPNOTSUPP;
338 }
339 } else {
340 inode->i_mode |= S_IFREG; /* then it is a file */
341 rc = -EOPNOTSUPP; /* or some unknown SFU type */
342 }
343 CIFSSMBClose(xid, pTcon, netfid);
344 }
345 return rc;
346}
347
348#define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */
349
350static int get_sfu_mode(struct inode *inode,
351 const unsigned char *path,
352 struct cifs_sb_info *cifs_sb, int xid)
353{
354#ifdef CONFIG_CIFS_XATTR
355 ssize_t rc;
356 char ea_value[4];
357 __u32 mode;
358
359 rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
360 ea_value, 4 /* size of buf */, cifs_sb->local_nls,
361 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
362 if (rc < 0)
363 return (int)rc;
364 else if (rc > 3) {
365 mode = le32_to_cpu(*((__le32 *)ea_value));
366 inode->i_mode &= ~SFBITS_MASK;
367 cFYI(1, ("special bits 0%o org mode 0%o", mode, inode->i_mode));
368 inode->i_mode = (mode & SFBITS_MASK) | inode->i_mode;
369 cFYI(1, ("special mode bits 0%o", mode));
370 return 0;
371 } else {
372 return 0;
373 }
374#else
375 return -EOPNOTSUPP;
376#endif
377}
378
379/*
380 * Needed to setup inode data for the directory which is the
381 * junction to the new submount (ie to setup the fake directory
382 * which represents a DFS referral)
383 */
384static void fill_fake_finddata(FILE_ALL_INFO *pfnd_dat,
385 struct super_block *sb)
386{
387 memset(pfnd_dat, 0, sizeof(FILE_ALL_INFO));
388
389/* __le64 pfnd_dat->AllocationSize = cpu_to_le64(0);
390 __le64 pfnd_dat->EndOfFile = cpu_to_le64(0);
391 __u8 pfnd_dat->DeletePending = 0;
392 __u8 pfnd_data->Directory = 0;
393 __le32 pfnd_dat->EASize = 0;
394 __u64 pfnd_dat->IndexNumber = 0;
395 __u64 pfnd_dat->IndexNumber1 = 0; */
396 pfnd_dat->CreationTime =
397 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
398 pfnd_dat->LastAccessTime =
399 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
400 pfnd_dat->LastWriteTime =
401 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
402 pfnd_dat->ChangeTime =
403 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
404 pfnd_dat->Attributes = cpu_to_le32(ATTR_DIRECTORY);
405 pfnd_dat->NumberOfLinks = cpu_to_le32(2);
406}
407
408int cifs_get_inode_info(struct inode **pinode,
409 const unsigned char *full_path, FILE_ALL_INFO *pfindData,
410 struct super_block *sb, int xid, const __u16 *pfid)
411{
412 int rc = 0;
413 __u32 attr;
414 struct cifsInodeInfo *cifsInfo;
415 struct cifsTconInfo *pTcon;
416 struct inode *inode;
417 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
418 char *buf = NULL;
419 bool adjustTZ = false;
420 bool is_dfs_referral = false;
421 umode_t default_mode;
422
423 pTcon = cifs_sb->tcon;
424 cFYI(1, ("Getting info on %s", full_path));
425
426 if ((pfindData == NULL) && (*pinode != NULL)) {
427 if (CIFS_I(*pinode)->clientCanCacheRead) {
428 cFYI(1, ("No need to revalidate cached inode sizes"));
429 return rc;
430 }
431 }
432
433 /* if file info not passed in then get it from server */
434 if (pfindData == NULL) {
435 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
436 if (buf == NULL)
437 return -ENOMEM;
438 pfindData = (FILE_ALL_INFO *)buf;
439
440 /* could do find first instead but this returns more info */
441 rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
442 0 /* not legacy */,
443 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
444 CIFS_MOUNT_MAP_SPECIAL_CHR);
445 /* BB optimize code so we do not make the above call
446 when server claims no NT SMB support and the above call
447 failed at least once - set flag in tcon or mount */
448 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
449 rc = SMBQueryInformation(xid, pTcon, full_path,
450 pfindData, cifs_sb->local_nls,
451 cifs_sb->mnt_cifs_flags &
452 CIFS_MOUNT_MAP_SPECIAL_CHR);
453 adjustTZ = true;
454 }
455 }
456 /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
457 if (rc == -EREMOTE) {
458 is_dfs_referral = true;
459 fill_fake_finddata(pfindData, sb);
460 rc = 0;
461 } else if (rc)
462 goto cgii_exit;
463
464 attr = le32_to_cpu(pfindData->Attributes);
465
466 /* get new inode */
467 if (*pinode == NULL) {
468 *pinode = new_inode(sb);
469 if (*pinode == NULL) {
470 rc = -ENOMEM;
471 goto cgii_exit;
472 }
473 /* Is an i_ino of zero legal? Can we use that to check
474 if the server supports returning inode numbers? Are
475 there other sanity checks we can use to ensure that
476 the server is really filling in that field? */
477
478 /* We can not use the IndexNumber field by default from
479 Windows or Samba (in ALL_INFO buf) but we can request
480 it explicitly. It may not be unique presumably if
481 the server has multiple devices mounted under one share */
482
483 /* There may be higher info levels that work but are
484 there Windows server or network appliances for which
485 IndexNumber field is not guaranteed unique? */
486
487 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
488 int rc1 = 0;
489 __u64 inode_num;
490
491 rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
492 full_path, &inode_num,
493 cifs_sb->local_nls,
494 cifs_sb->mnt_cifs_flags &
495 CIFS_MOUNT_MAP_SPECIAL_CHR);
496 if (rc1) {
497 cFYI(1, ("GetSrvInodeNum rc %d", rc1));
498 /* BB EOPNOSUPP disable SERVER_INUM? */
499 } else /* do we need cast or hash to ino? */
500 (*pinode)->i_ino = inode_num;
501 } /* else ino incremented to unique num in new_inode*/
502 if (sb->s_flags & MS_NOATIME)
503 (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
504 insert_inode_hash(*pinode);
505 }
506 inode = *pinode;
507 cifsInfo = CIFS_I(inode);
508 cifsInfo->cifsAttrs = attr;
509 cifsInfo->delete_pending = pfindData->DeletePending ? true : false;
510 cFYI(1, ("Old time %ld", cifsInfo->time));
511 cifsInfo->time = jiffies;
512 cFYI(1, ("New time %ld", cifsInfo->time));
513
514 /* blksize needs to be multiple of two. So safer to default to
515 blksize and blkbits set in superblock so 2**blkbits and blksize
516 will match rather than setting to:
517 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
518
519 /* Linux can not store file creation time so ignore it */
520 if (pfindData->LastAccessTime)
521 inode->i_atime = cifs_NTtimeToUnix
522 (le64_to_cpu(pfindData->LastAccessTime));
523 else /* do not need to use current_fs_time - time not stored */
524 inode->i_atime = CURRENT_TIME;
525 inode->i_mtime =
526 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
527 inode->i_ctime =
528 cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
529 cFYI(DBG2, ("Attributes came in as 0x%x", attr));
530 if (adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
531 inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
532 inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
533 }
534
535 /* get default inode mode */
536 if (attr & ATTR_DIRECTORY)
537 default_mode = cifs_sb->mnt_dir_mode;
538 else
539 default_mode = cifs_sb->mnt_file_mode;
540
541 /* set permission bits */
542 if (atomic_read(&cifsInfo->inUse) == 0 ||
543 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
544 inode->i_mode = default_mode;
545 else {
546 /* just reenable write bits if !ATTR_READONLY */
547 if ((inode->i_mode & S_IWUGO) == 0 &&
548 (attr & ATTR_READONLY) == 0)
549 inode->i_mode |= (S_IWUGO & default_mode);
550
551 inode->i_mode &= ~S_IFMT;
552 }
553 /* clear write bits if ATTR_READONLY is set */
554 if (attr & ATTR_READONLY)
555 inode->i_mode &= ~S_IWUGO;
556
557 /* set inode type */
558 if ((attr & ATTR_SYSTEM) &&
559 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
560 /* no need to fix endianness on 0 */
561 if (pfindData->EndOfFile == 0)
562 inode->i_mode |= S_IFIFO;
563 else if (decode_sfu_inode(inode,
564 le64_to_cpu(pfindData->EndOfFile),
565 full_path, cifs_sb, xid))
566 cFYI(1, ("unknown SFU file type\n"));
567 } else {
568 if (attr & ATTR_DIRECTORY)
569 inode->i_mode |= S_IFDIR;
570 else
571 inode->i_mode |= S_IFREG;
572 }
573
574 spin_lock(&inode->i_lock);
575 if (is_size_safe_to_change(cifsInfo,
576 le64_to_cpu(pfindData->EndOfFile))) {
577 /* can not safely shrink the file size here if the
578 client is writing to it due to potential races */
579 i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
580
581 /* 512 bytes (2**9) is the fake blocksize that must be
582 used for this calculation */
583 inode->i_blocks = (512 - 1 + le64_to_cpu(
584 pfindData->AllocationSize)) >> 9;
585 }
586 spin_unlock(&inode->i_lock);
587
588 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
589
590 /* BB fill in uid and gid here? with help from winbind?
591 or retrieve from NTFS stream extended attribute */
592#ifdef CONFIG_CIFS_EXPERIMENTAL
593 /* fill in 0777 bits from ACL */
594 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
595 cFYI(1, ("Getting mode bits from ACL"));
596 acl_to_uid_mode(inode, full_path, pfid);
597 }
598#endif
599 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
600 /* fill in remaining high mode bits e.g. SUID, VTX */
601 get_sfu_mode(inode, full_path, cifs_sb, xid);
602 } else if (atomic_read(&cifsInfo->inUse) == 0) {
603 inode->i_uid = cifs_sb->mnt_uid;
604 inode->i_gid = cifs_sb->mnt_gid;
605 /* set so we do not keep refreshing these fields with
606 bad data after user has changed them in memory */
607 atomic_set(&cifsInfo->inUse, 1);
608 }
609
610 cifs_set_ops(inode, is_dfs_referral);
611
612
613
614
615cgii_exit:
616 kfree(buf);
617 return rc;
618}
619
620static const struct inode_operations cifs_ipc_inode_ops = {
621 .lookup = cifs_lookup,
622};
623
624/* gets root inode */
625struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
626{
627 int xid;
628 struct cifs_sb_info *cifs_sb;
629 struct inode *inode;
630 long rc;
631
632 inode = iget_locked(sb, ino);
633 if (!inode)
634 return ERR_PTR(-ENOMEM);
635 if (!(inode->i_state & I_NEW))
636 return inode;
637
638 cifs_sb = CIFS_SB(inode->i_sb);
639 xid = GetXid();
640
641 if (cifs_sb->tcon->unix_ext)
642 rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
643 else
644 rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid,
645 NULL);
646 if (rc && cifs_sb->tcon->ipc) {
647 cFYI(1, ("ipc connection - fake read inode"));
648 inode->i_mode |= S_IFDIR;
649 inode->i_nlink = 2;
650 inode->i_op = &cifs_ipc_inode_ops;
651 inode->i_fop = &simple_dir_operations;
652 inode->i_uid = cifs_sb->mnt_uid;
653 inode->i_gid = cifs_sb->mnt_gid;
654 } else if (rc) {
655 _FreeXid(xid);
656 iget_failed(inode);
657 return ERR_PTR(rc);
658 }
659
660 unlock_new_inode(inode);
661
662 /* can not call macro FreeXid here since in a void func
663 * TODO: This is no longer true
664 */
665 _FreeXid(xid);
666 return inode;
667}
668
669static int
670cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
671 char *full_path, __u32 dosattr)
672{
673 int rc;
674 int oplock = 0;
675 __u16 netfid;
676 __u32 netpid;
677 bool set_time = false;
678 struct cifsFileInfo *open_file;
679 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
680 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
681 struct cifsTconInfo *pTcon = cifs_sb->tcon;
682 FILE_BASIC_INFO info_buf;
683
684 if (attrs->ia_valid & ATTR_ATIME) {
685 set_time = true;
686 info_buf.LastAccessTime =
687 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
688 } else
689 info_buf.LastAccessTime = 0;
690
691 if (attrs->ia_valid & ATTR_MTIME) {
692 set_time = true;
693 info_buf.LastWriteTime =
694 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
695 } else
696 info_buf.LastWriteTime = 0;
697
698 /*
699 * Samba throws this field away, but windows may actually use it.
700 * Do not set ctime unless other time stamps are changed explicitly
701 * (i.e. by utimes()) since we would then have a mix of client and
702 * server times.
703 */
704 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
705 cFYI(1, ("CIFS - CTIME changed"));
706 info_buf.ChangeTime =
707 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
708 } else
709 info_buf.ChangeTime = 0;
710
711 info_buf.CreationTime = 0; /* don't change */
712 info_buf.Attributes = cpu_to_le32(dosattr);
713
714 /*
715 * If the file is already open for write, just use that fileid
716 */
717 open_file = find_writable_file(cifsInode);
718 if (open_file) {
719 netfid = open_file->netfid;
720 netpid = open_file->pid;
721 goto set_via_filehandle;
722 }
723
724 /*
725 * NT4 apparently returns success on this call, but it doesn't
726 * really work.
727 */
728 if (!(pTcon->ses->flags & CIFS_SES_NT4)) {
729 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
730 &info_buf, cifs_sb->local_nls,
731 cifs_sb->mnt_cifs_flags &
732 CIFS_MOUNT_MAP_SPECIAL_CHR);
733 if (rc == 0) {
734 cifsInode->cifsAttrs = dosattr;
735 goto out;
736 } else if (rc != -EOPNOTSUPP && rc != -EINVAL)
737 goto out;
738 }
739
740 cFYI(1, ("calling SetFileInfo since SetPathInfo for "
741 "times not supported by this server"));
742 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
743 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
744 CREATE_NOT_DIR, &netfid, &oplock,
745 NULL, cifs_sb->local_nls,
746 cifs_sb->mnt_cifs_flags &
747 CIFS_MOUNT_MAP_SPECIAL_CHR);
748
749 if (rc != 0) {
750 if (rc == -EIO)
751 rc = -EINVAL;
752 goto out;
753 }
754
755 netpid = current->tgid;
756
757set_via_filehandle:
758 rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
759 if (!rc)
760 cifsInode->cifsAttrs = dosattr;
761
762 if (open_file == NULL)
763 CIFSSMBClose(xid, pTcon, netfid);
764 else
765 atomic_dec(&open_file->wrtPending);
766out:
767 return rc;
768}
769
770/*
771 * open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
772 * and rename it to a random name that hopefully won't conflict with
773 * anything else.
774 */
775static int
776cifs_rename_pending_delete(char *full_path, struct dentry *dentry, int xid)
777{
778 int oplock = 0;
779 int rc;
780 __u16 netfid;
781 struct inode *inode = dentry->d_inode;
782 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
783 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
784 struct cifsTconInfo *tcon = cifs_sb->tcon;
785 __u32 dosattr, origattr;
786 FILE_BASIC_INFO *info_buf = NULL;
787
788 rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
789 DELETE|FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
790 &netfid, &oplock, NULL, cifs_sb->local_nls,
791 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
792 if (rc != 0)
793 goto out;
794
795 origattr = cifsInode->cifsAttrs;
796 if (origattr == 0)
797 origattr |= ATTR_NORMAL;
798
799 dosattr = origattr & ~ATTR_READONLY;
800 if (dosattr == 0)
801 dosattr |= ATTR_NORMAL;
802 dosattr |= ATTR_HIDDEN;
803
804 /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
805 if (dosattr != origattr) {
806 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
807 if (info_buf == NULL) {
808 rc = -ENOMEM;
809 goto out_close;
810 }
811 info_buf->Attributes = cpu_to_le32(dosattr);
812 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
813 current->tgid);
814 /* although we would like to mark the file hidden
815 if that fails we will still try to rename it */
816 if (rc != 0)
817 cifsInode->cifsAttrs = dosattr;
818 else
819 dosattr = origattr; /* since not able to change them */
820 }
821
822 /* rename the file */
823 rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
824 cifs_sb->mnt_cifs_flags &
825 CIFS_MOUNT_MAP_SPECIAL_CHR);
826 if (rc != 0) {
827 rc = -ETXTBSY;
828 goto undo_setattr;
829 }
830
831 /* try to set DELETE_ON_CLOSE */
832 if (!cifsInode->delete_pending) {
833 rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid,
834 current->tgid);
835 /*
836 * some samba versions return -ENOENT when we try to set the
837 * file disposition here. Likely a samba bug, but work around
838 * it for now. This means that some cifsXXX files may hang
839 * around after they shouldn't.
840 *
841 * BB: remove this hack after more servers have the fix
842 */
843 if (rc == -ENOENT)
844 rc = 0;
845 else if (rc != 0) {
846 rc = -ETXTBSY;
847 goto undo_rename;
848 }
849 cifsInode->delete_pending = true;
850 }
851
852out_close:
853 CIFSSMBClose(xid, tcon, netfid);
854out:
855 kfree(info_buf);
856 return rc;
857
858 /*
859 * reset everything back to the original state. Don't bother
860 * dealing with errors here since we can't do anything about
861 * them anyway.
862 */
863undo_rename:
864 CIFSSMBRenameOpenFile(xid, tcon, netfid, dentry->d_name.name,
865 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
866 CIFS_MOUNT_MAP_SPECIAL_CHR);
867undo_setattr:
868 if (dosattr != origattr) {
869 info_buf->Attributes = cpu_to_le32(origattr);
870 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
871 current->tgid))
872 cifsInode->cifsAttrs = origattr;
873 }
874
875 goto out_close;
876}
877
878int cifs_unlink(struct inode *dir, struct dentry *dentry)
879{
880 int rc = 0;
881 int xid;
882 char *full_path = NULL;
883 struct inode *inode = dentry->d_inode;
884 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
885 struct super_block *sb = dir->i_sb;
886 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
887 struct cifsTconInfo *tcon = cifs_sb->tcon;
888 struct iattr *attrs = NULL;
889 __u32 dosattr = 0, origattr = 0;
890
891 cFYI(1, ("cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry));
892
893 xid = GetXid();
894
895 /* Unlink can be called from rename so we can not take the
896 * sb->s_vfs_rename_mutex here */
897 full_path = build_path_from_dentry(dentry);
898 if (full_path == NULL) {
899 FreeXid(xid);
900 return -ENOMEM;
901 }
902
903 if ((tcon->ses->capabilities & CAP_UNIX) &&
904 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
905 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
906 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
907 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
908 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
909 cFYI(1, ("posix del rc %d", rc));
910 if ((rc == 0) || (rc == -ENOENT))
911 goto psx_del_no_retry;
912 }
913
914retry_std_delete:
915 rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
916 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
917
918psx_del_no_retry:
919 if (!rc) {
920 if (inode)
921 drop_nlink(inode);
922 } else if (rc == -ENOENT) {
923 d_drop(dentry);
924 } else if (rc == -ETXTBSY) {
925 rc = cifs_rename_pending_delete(full_path, dentry, xid);
926 if (rc == 0)
927 drop_nlink(inode);
928 } else if (rc == -EACCES && dosattr == 0) {
929 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
930 if (attrs == NULL) {
931 rc = -ENOMEM;
932 goto out_reval;
933 }
934
935 /* try to reset dos attributes */
936 origattr = cifsInode->cifsAttrs;
937 if (origattr == 0)
938 origattr |= ATTR_NORMAL;
939 dosattr = origattr & ~ATTR_READONLY;
940 if (dosattr == 0)
941 dosattr |= ATTR_NORMAL;
942 dosattr |= ATTR_HIDDEN;
943
944 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
945 if (rc != 0)
946 goto out_reval;
947
948 goto retry_std_delete;
949 }
950
951 /* undo the setattr if we errored out and it's needed */
952 if (rc != 0 && dosattr != 0)
953 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
954
955out_reval:
956 if (inode) {
957 cifsInode = CIFS_I(inode);
958 cifsInode->time = 0; /* will force revalidate to get info
959 when needed */
960 inode->i_ctime = current_fs_time(sb);
961 }
962 dir->i_ctime = dir->i_mtime = current_fs_time(sb);
963 cifsInode = CIFS_I(dir);
964 CIFS_I(dir)->time = 0; /* force revalidate of dir as well */
965
966 kfree(full_path);
967 kfree(attrs);
968 FreeXid(xid);
969 return rc;
970}
971
972static void posix_fill_in_inode(struct inode *tmp_inode,
973 FILE_UNIX_BASIC_INFO *pData, int isNewInode)
974{
975 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
976 loff_t local_size;
977 struct timespec local_mtime;
978
979 cifsInfo->time = jiffies;
980 atomic_inc(&cifsInfo->inUse);
981
982 /* save mtime and size */
983 local_mtime = tmp_inode->i_mtime;
984 local_size = tmp_inode->i_size;
985
986 cifs_unix_info_to_inode(tmp_inode, pData, 1);
987 cifs_set_ops(tmp_inode, false);
988
989 if (!S_ISREG(tmp_inode->i_mode))
990 return;
991
992 /*
993 * No sense invalidating pages for new inode
994 * since we we have not started caching
995 * readahead file data yet.
996 */
997 if (isNewInode)
998 return;
999
1000 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
1001 (local_size == tmp_inode->i_size)) {
1002 cFYI(1, ("inode exists but unchanged"));
1003 } else {
1004 /* file may have changed on server */
1005 cFYI(1, ("invalidate inode, readdir detected change"));
1006 invalidate_remote_inode(tmp_inode);
1007 }
1008}
1009
1010int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
1011{
1012 int rc = 0, tmprc;
1013 int xid;
1014 struct cifs_sb_info *cifs_sb;
1015 struct cifsTconInfo *pTcon;
1016 char *full_path = NULL;
1017 struct inode *newinode = NULL;
1018
1019 cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
1020
1021 xid = GetXid();
1022
1023 cifs_sb = CIFS_SB(inode->i_sb);
1024 pTcon = cifs_sb->tcon;
1025
1026 full_path = build_path_from_dentry(direntry);
1027 if (full_path == NULL) {
1028 FreeXid(xid);
1029 return -ENOMEM;
1030 }
1031
1032 if ((pTcon->ses->capabilities & CAP_UNIX) &&
1033 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1034 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
1035 u32 oplock = 0;
1036 FILE_UNIX_BASIC_INFO *pInfo =
1037 kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1038 if (pInfo == NULL) {
1039 rc = -ENOMEM;
1040 goto mkdir_out;
1041 }
1042
1043 mode &= ~current->fs->umask;
1044 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
1045 mode, NULL /* netfid */, pInfo, &oplock,
1046 full_path, cifs_sb->local_nls,
1047 cifs_sb->mnt_cifs_flags &
1048 CIFS_MOUNT_MAP_SPECIAL_CHR);
1049 if (rc == -EOPNOTSUPP) {
1050 kfree(pInfo);
1051 goto mkdir_retry_old;
1052 } else if (rc) {
1053 cFYI(1, ("posix mkdir returned 0x%x", rc));
1054 d_drop(direntry);
1055 } else {
1056 if (pInfo->Type == cpu_to_le32(-1)) {
1057 /* no return info, go query for it */
1058 kfree(pInfo);
1059 goto mkdir_get_info;
1060 }
1061/*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
1062 to set uid/gid */
1063 inc_nlink(inode);
1064 if (pTcon->nocase)
1065 direntry->d_op = &cifs_ci_dentry_ops;
1066 else
1067 direntry->d_op = &cifs_dentry_ops;
1068
1069 newinode = new_inode(inode->i_sb);
1070 if (newinode == NULL) {
1071 kfree(pInfo);
1072 goto mkdir_get_info;
1073 }
1074
1075 /* Is an i_ino of zero legal? */
1076 /* Are there sanity checks we can use to ensure that
1077 the server is really filling in that field? */
1078 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
1079 newinode->i_ino =
1080 (unsigned long)pInfo->UniqueId;
1081 } /* note ino incremented to unique num in new_inode */
1082 if (inode->i_sb->s_flags & MS_NOATIME)
1083 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
1084 newinode->i_nlink = 2;
1085
1086 insert_inode_hash(newinode);
1087 d_instantiate(direntry, newinode);
1088
1089 /* we already checked in POSIXCreate whether
1090 frame was long enough */
1091 posix_fill_in_inode(direntry->d_inode,
1092 pInfo, 1 /* NewInode */);
1093#ifdef CONFIG_CIFS_DEBUG2
1094 cFYI(1, ("instantiated dentry %p %s to inode %p",
1095 direntry, direntry->d_name.name, newinode));
1096
1097 if (newinode->i_nlink != 2)
1098 cFYI(1, ("unexpected number of links %d",
1099 newinode->i_nlink));
1100#endif
1101 }
1102 kfree(pInfo);
1103 goto mkdir_out;
1104 }
1105mkdir_retry_old:
1106 /* BB add setting the equivalent of mode via CreateX w/ACLs */
1107 rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
1108 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1109 if (rc) {
1110 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
1111 d_drop(direntry);
1112 } else {
1113mkdir_get_info:
1114 inc_nlink(inode);
1115 if (pTcon->unix_ext)
1116 rc = cifs_get_inode_info_unix(&newinode, full_path,
1117 inode->i_sb, xid);
1118 else
1119 rc = cifs_get_inode_info(&newinode, full_path, NULL,
1120 inode->i_sb, xid, NULL);
1121
1122 if (pTcon->nocase)
1123 direntry->d_op = &cifs_ci_dentry_ops;
1124 else
1125 direntry->d_op = &cifs_dentry_ops;
1126 d_instantiate(direntry, newinode);
1127 /* setting nlink not necessary except in cases where we
1128 * failed to get it from the server or was set bogus */
1129 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1130 direntry->d_inode->i_nlink = 2;
1131
1132 mode &= ~current->fs->umask;
1133 /* must turn on setgid bit if parent dir has it */
1134 if (inode->i_mode & S_ISGID)
1135 mode |= S_ISGID;
1136
1137 if (pTcon->unix_ext) {
1138 struct cifs_unix_set_info_args args = {
1139 .mode = mode,
1140 .ctime = NO_CHANGE_64,
1141 .atime = NO_CHANGE_64,
1142 .mtime = NO_CHANGE_64,
1143 .device = 0,
1144 };
1145 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1146 args.uid = (__u64)current->fsuid;
1147 if (inode->i_mode & S_ISGID)
1148 args.gid = (__u64)inode->i_gid;
1149 else
1150 args.gid = (__u64)current->fsgid;
1151 } else {
1152 args.uid = NO_CHANGE_64;
1153 args.gid = NO_CHANGE_64;
1154 }
1155 CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
1156 cifs_sb->local_nls,
1157 cifs_sb->mnt_cifs_flags &
1158 CIFS_MOUNT_MAP_SPECIAL_CHR);
1159 } else {
1160 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1161 (mode & S_IWUGO) == 0) {
1162 FILE_BASIC_INFO pInfo;
1163 struct cifsInodeInfo *cifsInode;
1164 u32 dosattrs;
1165
1166 memset(&pInfo, 0, sizeof(pInfo));
1167 cifsInode = CIFS_I(newinode);
1168 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
1169 pInfo.Attributes = cpu_to_le32(dosattrs);
1170 tmprc = CIFSSMBSetPathInfo(xid, pTcon,
1171 full_path, &pInfo,
1172 cifs_sb->local_nls,
1173 cifs_sb->mnt_cifs_flags &
1174 CIFS_MOUNT_MAP_SPECIAL_CHR);
1175 if (tmprc == 0)
1176 cifsInode->cifsAttrs = dosattrs;
1177 }
1178 if (direntry->d_inode) {
1179 if (cifs_sb->mnt_cifs_flags &
1180 CIFS_MOUNT_DYNPERM)
1181 direntry->d_inode->i_mode =
1182 (mode | S_IFDIR);
1183
1184 if (cifs_sb->mnt_cifs_flags &
1185 CIFS_MOUNT_SET_UID) {
1186 direntry->d_inode->i_uid =
1187 current->fsuid;
1188 if (inode->i_mode & S_ISGID)
1189 direntry->d_inode->i_gid =
1190 inode->i_gid;
1191 else
1192 direntry->d_inode->i_gid =
1193 current->fsgid;
1194 }
1195 }
1196 }
1197 }
1198mkdir_out:
1199 kfree(full_path);
1200 FreeXid(xid);
1201 return rc;
1202}
1203
1204int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1205{
1206 int rc = 0;
1207 int xid;
1208 struct cifs_sb_info *cifs_sb;
1209 struct cifsTconInfo *pTcon;
1210 char *full_path = NULL;
1211 struct cifsInodeInfo *cifsInode;
1212
1213 cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1214
1215 xid = GetXid();
1216
1217 cifs_sb = CIFS_SB(inode->i_sb);
1218 pTcon = cifs_sb->tcon;
1219
1220 full_path = build_path_from_dentry(direntry);
1221 if (full_path == NULL) {
1222 FreeXid(xid);
1223 return -ENOMEM;
1224 }
1225
1226 rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1227 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1228
1229 if (!rc) {
1230 drop_nlink(inode);
1231 spin_lock(&direntry->d_inode->i_lock);
1232 i_size_write(direntry->d_inode, 0);
1233 clear_nlink(direntry->d_inode);
1234 spin_unlock(&direntry->d_inode->i_lock);
1235 }
1236
1237 cifsInode = CIFS_I(direntry->d_inode);
1238 cifsInode->time = 0; /* force revalidate to go get info when
1239 needed */
1240 direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1241 current_fs_time(inode->i_sb);
1242
1243 kfree(full_path);
1244 FreeXid(xid);
1245 return rc;
1246}
1247
1248static int
1249cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
1250 struct dentry *to_dentry, const char *toPath)
1251{
1252 struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1253 struct cifsTconInfo *pTcon = cifs_sb->tcon;
1254 __u16 srcfid;
1255 int oplock, rc;
1256
1257 /* try path-based rename first */
1258 rc = CIFSSMBRename(xid, pTcon, fromPath, toPath, cifs_sb->local_nls,
1259 cifs_sb->mnt_cifs_flags &
1260 CIFS_MOUNT_MAP_SPECIAL_CHR);
1261
1262 /*
1263 * don't bother with rename by filehandle unless file is busy and
1264 * source Note that cross directory moves do not work with
1265 * rename by filehandle to various Windows servers.
1266 */
1267 if (rc == 0 || rc != -ETXTBSY)
1268 return rc;
1269
1270 /* open the file to be renamed -- we need DELETE perms */
1271 rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
1272 CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1273 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1274 CIFS_MOUNT_MAP_SPECIAL_CHR);
1275
1276 if (rc == 0) {
1277 rc = CIFSSMBRenameOpenFile(xid, pTcon, srcfid,
1278 (const char *) to_dentry->d_name.name,
1279 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1280 CIFS_MOUNT_MAP_SPECIAL_CHR);
1281
1282 CIFSSMBClose(xid, pTcon, srcfid);
1283 }
1284
1285 return rc;
1286}
1287
1288int cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
1289 struct inode *target_dir, struct dentry *target_dentry)
1290{
1291 char *fromName = NULL;
1292 char *toName = NULL;
1293 struct cifs_sb_info *cifs_sb_source;
1294 struct cifs_sb_info *cifs_sb_target;
1295 struct cifsTconInfo *tcon;
1296 FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1297 FILE_UNIX_BASIC_INFO *info_buf_target;
1298 int xid, rc, tmprc;
1299
1300 cifs_sb_target = CIFS_SB(target_dir->i_sb);
1301 cifs_sb_source = CIFS_SB(source_dir->i_sb);
1302 tcon = cifs_sb_source->tcon;
1303
1304 xid = GetXid();
1305
1306 /*
1307 * BB: this might be allowed if same server, but different share.
1308 * Consider adding support for this
1309 */
1310 if (tcon != cifs_sb_target->tcon) {
1311 rc = -EXDEV;
1312 goto cifs_rename_exit;
1313 }
1314
1315 /*
1316 * we already have the rename sem so we do not need to
1317 * grab it again here to protect the path integrity
1318 */
1319 fromName = build_path_from_dentry(source_dentry);
1320 if (fromName == NULL) {
1321 rc = -ENOMEM;
1322 goto cifs_rename_exit;
1323 }
1324
1325 toName = build_path_from_dentry(target_dentry);
1326 if (toName == NULL) {
1327 rc = -ENOMEM;
1328 goto cifs_rename_exit;
1329 }
1330
1331 rc = cifs_do_rename(xid, source_dentry, fromName,
1332 target_dentry, toName);
1333
1334 if (rc == -EEXIST && tcon->unix_ext) {
1335 /*
1336 * Are src and dst hardlinks of same inode? We can
1337 * only tell with unix extensions enabled
1338 */
1339 info_buf_source =
1340 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1341 GFP_KERNEL);
1342 if (info_buf_source == NULL) {
1343 rc = -ENOMEM;
1344 goto cifs_rename_exit;
1345 }
1346
1347 info_buf_target = info_buf_source + 1;
1348 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, fromName,
1349 info_buf_source,
1350 cifs_sb_source->local_nls,
1351 cifs_sb_source->mnt_cifs_flags &
1352 CIFS_MOUNT_MAP_SPECIAL_CHR);
1353 if (tmprc != 0)
1354 goto unlink_target;
1355
1356 tmprc = CIFSSMBUnixQPathInfo(xid, tcon,
1357 toName, info_buf_target,
1358 cifs_sb_target->local_nls,
1359 /* remap based on source sb */
1360 cifs_sb_source->mnt_cifs_flags &
1361 CIFS_MOUNT_MAP_SPECIAL_CHR);
1362
1363 if (tmprc == 0 && (info_buf_source->UniqueId ==
1364 info_buf_target->UniqueId)) {
1365 /* same file, POSIX says that this is a noop */
1366 rc = 0;
1367 goto cifs_rename_exit;
1368 }
1369 } /* else ... BB we could add the same check for Windows by
1370 checking the UniqueId via FILE_INTERNAL_INFO */
1371
1372unlink_target:
1373 if ((rc == -EACCES) || (rc == -EEXIST)) {
1374 tmprc = cifs_unlink(target_dir, target_dentry);
1375 if (tmprc)
1376 goto cifs_rename_exit;
1377
1378 rc = cifs_do_rename(xid, source_dentry, fromName,
1379 target_dentry, toName);
1380 }
1381
1382cifs_rename_exit:
1383 kfree(info_buf_source);
1384 kfree(fromName);
1385 kfree(toName);
1386 FreeXid(xid);
1387 return rc;
1388}
1389
1390int cifs_revalidate(struct dentry *direntry)
1391{
1392 int xid;
1393 int rc = 0, wbrc = 0;
1394 char *full_path;
1395 struct cifs_sb_info *cifs_sb;
1396 struct cifsInodeInfo *cifsInode;
1397 loff_t local_size;
1398 struct timespec local_mtime;
1399 bool invalidate_inode = false;
1400
1401 if (direntry->d_inode == NULL)
1402 return -ENOENT;
1403
1404 cifsInode = CIFS_I(direntry->d_inode);
1405
1406 if (cifsInode == NULL)
1407 return -ENOENT;
1408
1409 /* no sense revalidating inode info on file that no one can write */
1410 if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1411 return rc;
1412
1413 xid = GetXid();
1414
1415 cifs_sb = CIFS_SB(direntry->d_sb);
1416
1417 /* can not safely grab the rename sem here if rename calls revalidate
1418 since that would deadlock */
1419 full_path = build_path_from_dentry(direntry);
1420 if (full_path == NULL) {
1421 FreeXid(xid);
1422 return -ENOMEM;
1423 }
1424 cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1425 "jiffies %ld", full_path, direntry->d_inode,
1426 direntry->d_inode->i_count.counter, direntry,
1427 direntry->d_time, jiffies));
1428
1429 if (cifsInode->time == 0) {
1430 /* was set to zero previously to force revalidate */
1431 } else if (time_before(jiffies, cifsInode->time + HZ) &&
1432 lookupCacheEnabled) {
1433 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1434 (direntry->d_inode->i_nlink == 1)) {
1435 kfree(full_path);
1436 FreeXid(xid);
1437 return rc;
1438 } else {
1439 cFYI(1, ("Have to revalidate file due to hardlinks"));
1440 }
1441 }
1442
1443 /* save mtime and size */
1444 local_mtime = direntry->d_inode->i_mtime;
1445 local_size = direntry->d_inode->i_size;
1446
1447 if (cifs_sb->tcon->unix_ext) {
1448 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1449 direntry->d_sb, xid);
1450 if (rc) {
1451 cFYI(1, ("error on getting revalidate info %d", rc));
1452/* if (rc != -ENOENT)
1453 rc = 0; */ /* BB should we cache info on
1454 certain errors? */
1455 }
1456 } else {
1457 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1458 direntry->d_sb, xid, NULL);
1459 if (rc) {
1460 cFYI(1, ("error on getting revalidate info %d", rc));
1461/* if (rc != -ENOENT)
1462 rc = 0; */ /* BB should we cache info on
1463 certain errors? */
1464 }
1465 }
1466 /* should we remap certain errors, access denied?, to zero */
1467
1468 /* if not oplocked, we invalidate inode pages if mtime or file size
1469 had changed on server */
1470
1471 if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1472 (local_size == direntry->d_inode->i_size)) {
1473 cFYI(1, ("cifs_revalidate - inode unchanged"));
1474 } else {
1475 /* file may have changed on server */
1476 if (cifsInode->clientCanCacheRead) {
1477 /* no need to invalidate inode pages since we were the
1478 only ones who could have modified the file and the
1479 server copy is staler than ours */
1480 } else {
1481 invalidate_inode = true;
1482 }
1483 }
1484
1485 /* can not grab this sem since kernel filesys locking documentation
1486 indicates i_mutex may be taken by the kernel on lookup and rename
1487 which could deadlock if we grab the i_mutex here as well */
1488/* mutex_lock(&direntry->d_inode->i_mutex);*/
1489 /* need to write out dirty pages here */
1490 if (direntry->d_inode->i_mapping) {
1491 /* do we need to lock inode until after invalidate completes
1492 below? */
1493 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1494 if (wbrc)
1495 CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1496 }
1497 if (invalidate_inode) {
1498 /* shrink_dcache not necessary now that cifs dentry ops
1499 are exported for negative dentries */
1500/* if (S_ISDIR(direntry->d_inode->i_mode))
1501 shrink_dcache_parent(direntry); */
1502 if (S_ISREG(direntry->d_inode->i_mode)) {
1503 if (direntry->d_inode->i_mapping) {
1504 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1505 if (wbrc)
1506 CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1507 }
1508 /* may eventually have to do this for open files too */
1509 if (list_empty(&(cifsInode->openFileList))) {
1510 /* changed on server - flush read ahead pages */
1511 cFYI(1, ("Invalidating read ahead data on "
1512 "closed file"));
1513 invalidate_remote_inode(direntry->d_inode);
1514 }
1515 }
1516 }
1517/* mutex_unlock(&direntry->d_inode->i_mutex); */
1518
1519 kfree(full_path);
1520 FreeXid(xid);
1521 return rc;
1522}
1523
1524int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1525 struct kstat *stat)
1526{
1527 int err = cifs_revalidate(dentry);
1528 if (!err) {
1529 generic_fillattr(dentry->d_inode, stat);
1530 stat->blksize = CIFS_MAX_MSGSIZE;
1531 }
1532 return err;
1533}
1534
1535static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1536{
1537 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1538 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1539 struct page *page;
1540 int rc = 0;
1541
1542 page = grab_cache_page(mapping, index);
1543 if (!page)
1544 return -ENOMEM;
1545
1546 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1547 unlock_page(page);
1548 page_cache_release(page);
1549 return rc;
1550}
1551
1552static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1553{
1554 struct address_space *mapping = inode->i_mapping;
1555 unsigned long limit;
1556
1557 spin_lock(&inode->i_lock);
1558 if (inode->i_size < offset)
1559 goto do_expand;
1560 /*
1561 * truncation of in-use swapfiles is disallowed - it would cause
1562 * subsequent swapout to scribble on the now-freed blocks.
1563 */
1564 if (IS_SWAPFILE(inode)) {
1565 spin_unlock(&inode->i_lock);
1566 goto out_busy;
1567 }
1568 i_size_write(inode, offset);
1569 spin_unlock(&inode->i_lock);
1570 /*
1571 * unmap_mapping_range is called twice, first simply for efficiency
1572 * so that truncate_inode_pages does fewer single-page unmaps. However
1573 * after this first call, and before truncate_inode_pages finishes,
1574 * it is possible for private pages to be COWed, which remain after
1575 * truncate_inode_pages finishes, hence the second unmap_mapping_range
1576 * call must be made for correctness.
1577 */
1578 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1579 truncate_inode_pages(mapping, offset);
1580 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1581 goto out_truncate;
1582
1583do_expand:
1584 limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1585 if (limit != RLIM_INFINITY && offset > limit) {
1586 spin_unlock(&inode->i_lock);
1587 goto out_sig;
1588 }
1589 if (offset > inode->i_sb->s_maxbytes) {
1590 spin_unlock(&inode->i_lock);
1591 goto out_big;
1592 }
1593 i_size_write(inode, offset);
1594 spin_unlock(&inode->i_lock);
1595out_truncate:
1596 if (inode->i_op && inode->i_op->truncate)
1597 inode->i_op->truncate(inode);
1598 return 0;
1599out_sig:
1600 send_sig(SIGXFSZ, current, 0);
1601out_big:
1602 return -EFBIG;
1603out_busy:
1604 return -ETXTBSY;
1605}
1606
1607static int
1608cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1609 int xid, char *full_path)
1610{
1611 int rc;
1612 struct cifsFileInfo *open_file;
1613 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1614 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1615 struct cifsTconInfo *pTcon = cifs_sb->tcon;
1616
1617 /*
1618 * To avoid spurious oplock breaks from server, in the case of
1619 * inodes that we already have open, avoid doing path based
1620 * setting of file size if we can do it by handle.
1621 * This keeps our caching token (oplock) and avoids timeouts
1622 * when the local oplock break takes longer to flush
1623 * writebehind data than the SMB timeout for the SetPathInfo
1624 * request would allow
1625 */
1626 open_file = find_writable_file(cifsInode);
1627 if (open_file) {
1628 __u16 nfid = open_file->netfid;
1629 __u32 npid = open_file->pid;
1630 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1631 npid, false);
1632 atomic_dec(&open_file->wrtPending);
1633 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1634 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1635 unsigned int bytes_written;
1636 rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
1637 &bytes_written, NULL, NULL, 1);
1638 cFYI(1, ("Wrt seteof rc %d", rc));
1639 }
1640 } else
1641 rc = -EINVAL;
1642
1643 if (rc != 0) {
1644 /* Set file size by pathname rather than by handle
1645 either because no valid, writeable file handle for
1646 it was found or because there was an error setting
1647 it by handle */
1648 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1649 false, cifs_sb->local_nls,
1650 cifs_sb->mnt_cifs_flags &
1651 CIFS_MOUNT_MAP_SPECIAL_CHR);
1652 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1653 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1654 __u16 netfid;
1655 int oplock = 0;
1656
1657 rc = SMBLegacyOpen(xid, pTcon, full_path,
1658 FILE_OPEN, GENERIC_WRITE,
1659 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1660 cifs_sb->local_nls,
1661 cifs_sb->mnt_cifs_flags &
1662 CIFS_MOUNT_MAP_SPECIAL_CHR);
1663 if (rc == 0) {
1664 unsigned int bytes_written;
1665 rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
1666 attrs->ia_size,
1667 &bytes_written, NULL,
1668 NULL, 1);
1669 cFYI(1, ("wrt seteof rc %d", rc));
1670 CIFSSMBClose(xid, pTcon, netfid);
1671 }
1672 }
1673 }
1674
1675 if (rc == 0) {
1676 rc = cifs_vmtruncate(inode, attrs->ia_size);
1677 cifs_truncate_page(inode->i_mapping, inode->i_size);
1678 }
1679
1680 return rc;
1681}
1682
1683static int
1684cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1685{
1686 int rc;
1687 int xid;
1688 char *full_path = NULL;
1689 struct inode *inode = direntry->d_inode;
1690 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1691 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1692 struct cifsTconInfo *pTcon = cifs_sb->tcon;
1693 struct cifs_unix_set_info_args *args = NULL;
1694
1695 cFYI(1, ("setattr_unix on file %s attrs->ia_valid=0x%x",
1696 direntry->d_name.name, attrs->ia_valid));
1697
1698 xid = GetXid();
1699
1700 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1701 /* check if we have permission to change attrs */
1702 rc = inode_change_ok(inode, attrs);
1703 if (rc < 0)
1704 goto out;
1705 else
1706 rc = 0;
1707 }
1708
1709 full_path = build_path_from_dentry(direntry);
1710 if (full_path == NULL) {
1711 rc = -ENOMEM;
1712 goto out;
1713 }
1714
1715 if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1716 /*
1717 Flush data before changing file size or changing the last
1718 write time of the file on the server. If the
1719 flush returns error, store it to report later and continue.
1720 BB: This should be smarter. Why bother flushing pages that
1721 will be truncated anyway? Also, should we error out here if
1722 the flush returns error?
1723 */
1724 rc = filemap_write_and_wait(inode->i_mapping);
1725 if (rc != 0) {
1726 cifsInode->write_behind_rc = rc;
1727 rc = 0;
1728 }
1729 }
1730
1731 if (attrs->ia_valid & ATTR_SIZE) {
1732 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1733 if (rc != 0)
1734 goto out;
1735 }
1736
1737 /* skip mode change if it's just for clearing setuid/setgid */
1738 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1739 attrs->ia_valid &= ~ATTR_MODE;
1740
1741 args = kmalloc(sizeof(*args), GFP_KERNEL);
1742 if (args == NULL) {
1743 rc = -ENOMEM;
1744 goto out;
1745 }
1746
1747 /* set up the struct */
1748 if (attrs->ia_valid & ATTR_MODE)
1749 args->mode = attrs->ia_mode;
1750 else
1751 args->mode = NO_CHANGE_64;
1752
1753 if (attrs->ia_valid & ATTR_UID)
1754 args->uid = attrs->ia_uid;
1755 else
1756 args->uid = NO_CHANGE_64;
1757
1758 if (attrs->ia_valid & ATTR_GID)
1759 args->gid = attrs->ia_gid;
1760 else
1761 args->gid = NO_CHANGE_64;
1762
1763 if (attrs->ia_valid & ATTR_ATIME)
1764 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
1765 else
1766 args->atime = NO_CHANGE_64;
1767
1768 if (attrs->ia_valid & ATTR_MTIME)
1769 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
1770 else
1771 args->mtime = NO_CHANGE_64;
1772
1773 if (attrs->ia_valid & ATTR_CTIME)
1774 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
1775 else
1776 args->ctime = NO_CHANGE_64;
1777
1778 args->device = 0;
1779 rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path, args,
1780 cifs_sb->local_nls,
1781 cifs_sb->mnt_cifs_flags &
1782 CIFS_MOUNT_MAP_SPECIAL_CHR);
1783
1784 if (!rc)
1785 rc = inode_setattr(inode, attrs);
1786out:
1787 kfree(args);
1788 kfree(full_path);
1789 FreeXid(xid);
1790 return rc;
1791}
1792
1793static int
1794cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
1795{
1796 int xid;
1797 struct inode *inode = direntry->d_inode;
1798 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1799 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1800 char *full_path = NULL;
1801 int rc = -EACCES;
1802 __u32 dosattr = 0;
1803 __u64 mode = NO_CHANGE_64;
1804
1805 xid = GetXid();
1806
1807 cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1808 direntry->d_name.name, attrs->ia_valid));
1809
1810 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1811 /* check if we have permission to change attrs */
1812 rc = inode_change_ok(inode, attrs);
1813 if (rc < 0) {
1814 FreeXid(xid);
1815 return rc;
1816 } else
1817 rc = 0;
1818 }
1819
1820 full_path = build_path_from_dentry(direntry);
1821 if (full_path == NULL) {
1822 FreeXid(xid);
1823 return -ENOMEM;
1824 }
1825
1826 if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1827 /*
1828 Flush data before changing file size or changing the last
1829 write time of the file on the server. If the
1830 flush returns error, store it to report later and continue.
1831 BB: This should be smarter. Why bother flushing pages that
1832 will be truncated anyway? Also, should we error out here if
1833 the flush returns error?
1834 */
1835 rc = filemap_write_and_wait(inode->i_mapping);
1836 if (rc != 0) {
1837 cifsInode->write_behind_rc = rc;
1838 rc = 0;
1839 }
1840 }
1841
1842 if (attrs->ia_valid & ATTR_SIZE) {
1843 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1844 if (rc != 0)
1845 goto cifs_setattr_exit;
1846 }
1847
1848 /*
1849 * Without unix extensions we can't send ownership changes to the
1850 * server, so silently ignore them. This is consistent with how
1851 * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
1852 * CIFSACL support + proper Windows to Unix idmapping, we may be
1853 * able to support this in the future.
1854 */
1855 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
1856 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
1857
1858 /* skip mode change if it's just for clearing setuid/setgid */
1859 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1860 attrs->ia_valid &= ~ATTR_MODE;
1861
1862 if (attrs->ia_valid & ATTR_MODE) {
1863 cFYI(1, ("Mode changed to 0%o", attrs->ia_mode));
1864 mode = attrs->ia_mode;
1865 }
1866
1867 if (attrs->ia_valid & ATTR_MODE) {
1868 rc = 0;
1869#ifdef CONFIG_CIFS_EXPERIMENTAL
1870 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1871 rc = mode_to_acl(inode, full_path, mode);
1872 else
1873#endif
1874 if (((mode & S_IWUGO) == 0) &&
1875 (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1876
1877 dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
1878
1879 /* fix up mode if we're not using dynperm */
1880 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
1881 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
1882 } else if ((mode & S_IWUGO) &&
1883 (cifsInode->cifsAttrs & ATTR_READONLY)) {
1884
1885 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
1886 /* Attributes of 0 are ignored */
1887 if (dosattr == 0)
1888 dosattr |= ATTR_NORMAL;
1889
1890 /* reset local inode permissions to normal */
1891 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1892 attrs->ia_mode &= ~(S_IALLUGO);
1893 if (S_ISDIR(inode->i_mode))
1894 attrs->ia_mode |=
1895 cifs_sb->mnt_dir_mode;
1896 else
1897 attrs->ia_mode |=
1898 cifs_sb->mnt_file_mode;
1899 }
1900 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1901 /* ignore mode change - ATTR_READONLY hasn't changed */
1902 attrs->ia_valid &= ~ATTR_MODE;
1903 }
1904 }
1905
1906 if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
1907 ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
1908 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1909 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
1910
1911 /* Even if error on time set, no sense failing the call if
1912 the server would set the time to a reasonable value anyway,
1913 and this check ensures that we are not being called from
1914 sys_utimes in which case we ought to fail the call back to
1915 the user when the server rejects the call */
1916 if ((rc) && (attrs->ia_valid &
1917 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1918 rc = 0;
1919 }
1920
1921 /* do not need local check to inode_check_ok since the server does
1922 that */
1923 if (!rc)
1924 rc = inode_setattr(inode, attrs);
1925cifs_setattr_exit:
1926 kfree(full_path);
1927 FreeXid(xid);
1928 return rc;
1929}
1930
1931int
1932cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1933{
1934 struct inode *inode = direntry->d_inode;
1935 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1936 struct cifsTconInfo *pTcon = cifs_sb->tcon;
1937
1938 if (pTcon->unix_ext)
1939 return cifs_setattr_unix(direntry, attrs);
1940
1941 return cifs_setattr_nounix(direntry, attrs);
1942
1943 /* BB: add cifs_setattr_legacy for really old servers */
1944}
1945
1946#if 0
1947void cifs_delete_inode(struct inode *inode)
1948{
1949 cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1950 /* may have to add back in if and when safe distributed caching of
1951 directories added e.g. via FindNotify */
1952}
1953#endif
Linux 6.x block layer and io_uring tree(s)