Merge branch 'work.aio' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[sfrench/cifs-2.6.git] / fs / cifs / inode.c
1 /*
2  *   fs/cifs/inode.c
3  *
4  *   Copyright (C) International Business Machines  Corp., 2002,2010
5  *   Author(s): Steve French (sfrench@us.ibm.com)
6  *
7  *   This library is free software; you can redistribute it and/or modify
8  *   it under the terms of the GNU Lesser General Public License as published
9  *   by the Free Software Foundation; either version 2.1 of the License, or
10  *   (at your option) any later version.
11  *
12  *   This library is distributed in the hope that it will be useful,
13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
15  *   the GNU Lesser General Public License for more details.
16  *
17  *   You should have received a copy of the GNU Lesser General Public License
18  *   along with this library; if not, write to the Free Software
19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  */
21 #include <linux/fs.h>
22 #include <linux/stat.h>
23 #include <linux/slab.h>
24 #include <linux/pagemap.h>
25 #include <linux/freezer.h>
26 #include <linux/sched/signal.h>
27 #include <linux/wait_bit.h>
28
29 #include <asm/div64.h>
30 #include "cifsfs.h"
31 #include "cifspdu.h"
32 #include "cifsglob.h"
33 #include "cifsproto.h"
34 #include "cifs_debug.h"
35 #include "cifs_fs_sb.h"
36 #include "cifs_unicode.h"
37 #include "fscache.h"
38
39
40 static void cifs_set_ops(struct inode *inode)
41 {
42         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
43
44         switch (inode->i_mode & S_IFMT) {
45         case S_IFREG:
46                 inode->i_op = &cifs_file_inode_ops;
47                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
48                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
49                                 inode->i_fop = &cifs_file_direct_nobrl_ops;
50                         else
51                                 inode->i_fop = &cifs_file_direct_ops;
52                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
53                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
54                                 inode->i_fop = &cifs_file_strict_nobrl_ops;
55                         else
56                                 inode->i_fop = &cifs_file_strict_ops;
57                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
58                         inode->i_fop = &cifs_file_nobrl_ops;
59                 else { /* not direct, send byte range locks */
60                         inode->i_fop = &cifs_file_ops;
61                 }
62
63                 /* check if server can support readpages */
64                 if (cifs_sb_master_tcon(cifs_sb)->ses->server->maxBuf <
65                                 PAGE_SIZE + MAX_CIFS_HDR_SIZE)
66                         inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
67                 else
68                         inode->i_data.a_ops = &cifs_addr_ops;
69                 break;
70         case S_IFDIR:
71 #ifdef CONFIG_CIFS_DFS_UPCALL
72                 if (IS_AUTOMOUNT(inode)) {
73                         inode->i_op = &cifs_dfs_referral_inode_operations;
74                 } else {
75 #else /* NO DFS support, treat as a directory */
76                 {
77 #endif
78                         inode->i_op = &cifs_dir_inode_ops;
79                         inode->i_fop = &cifs_dir_ops;
80                 }
81                 break;
82         case S_IFLNK:
83                 inode->i_op = &cifs_symlink_inode_ops;
84                 break;
85         default:
86                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
87                 break;
88         }
89 }
90
91 /* check inode attributes against fattr. If they don't match, tag the
92  * inode for cache invalidation
93  */
94 static void
95 cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
96 {
97         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
98
99         cifs_dbg(FYI, "%s: revalidating inode %llu\n",
100                  __func__, cifs_i->uniqueid);
101
102         if (inode->i_state & I_NEW) {
103                 cifs_dbg(FYI, "%s: inode %llu is new\n",
104                          __func__, cifs_i->uniqueid);
105                 return;
106         }
107
108         /* don't bother with revalidation if we have an oplock */
109         if (CIFS_CACHE_READ(cifs_i)) {
110                 cifs_dbg(FYI, "%s: inode %llu is oplocked\n",
111                          __func__, cifs_i->uniqueid);
112                 return;
113         }
114
115          /* revalidate if mtime or size have changed */
116         if (timespec_equal(&inode->i_mtime, &fattr->cf_mtime) &&
117             cifs_i->server_eof == fattr->cf_eof) {
118                 cifs_dbg(FYI, "%s: inode %llu is unchanged\n",
119                          __func__, cifs_i->uniqueid);
120                 return;
121         }
122
123         cifs_dbg(FYI, "%s: invalidating inode %llu mapping\n",
124                  __func__, cifs_i->uniqueid);
125         set_bit(CIFS_INO_INVALID_MAPPING, &cifs_i->flags);
126 }
127
128 /*
129  * copy nlink to the inode, unless it wasn't provided.  Provide
130  * sane values if we don't have an existing one and none was provided
131  */
132 static void
133 cifs_nlink_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
134 {
135         /*
136          * if we're in a situation where we can't trust what we
137          * got from the server (readdir, some non-unix cases)
138          * fake reasonable values
139          */
140         if (fattr->cf_flags & CIFS_FATTR_UNKNOWN_NLINK) {
141                 /* only provide fake values on a new inode */
142                 if (inode->i_state & I_NEW) {
143                         if (fattr->cf_cifsattrs & ATTR_DIRECTORY)
144                                 set_nlink(inode, 2);
145                         else
146                                 set_nlink(inode, 1);
147                 }
148                 return;
149         }
150
151         /* we trust the server, so update it */
152         set_nlink(inode, fattr->cf_nlink);
153 }
154
155 /* populate an inode with info from a cifs_fattr struct */
156 void
157 cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
158 {
159         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
160         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
161
162         cifs_revalidate_cache(inode, fattr);
163
164         spin_lock(&inode->i_lock);
165         inode->i_atime = fattr->cf_atime;
166         inode->i_mtime = fattr->cf_mtime;
167         inode->i_ctime = fattr->cf_ctime;
168         inode->i_rdev = fattr->cf_rdev;
169         cifs_nlink_fattr_to_inode(inode, fattr);
170         inode->i_uid = fattr->cf_uid;
171         inode->i_gid = fattr->cf_gid;
172
173         /* if dynperm is set, don't clobber existing mode */
174         if (inode->i_state & I_NEW ||
175             !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM))
176                 inode->i_mode = fattr->cf_mode;
177
178         cifs_i->cifsAttrs = fattr->cf_cifsattrs;
179
180         if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
181                 cifs_i->time = 0;
182         else
183                 cifs_i->time = jiffies;
184
185         if (fattr->cf_flags & CIFS_FATTR_DELETE_PENDING)
186                 set_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags);
187         else
188                 clear_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags);
189
190         cifs_i->server_eof = fattr->cf_eof;
191         /*
192          * Can't safely change the file size here if the client is writing to
193          * it due to potential races.
194          */
195         if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) {
196                 i_size_write(inode, fattr->cf_eof);
197
198                 /*
199                  * i_blocks is not related to (i_size / i_blksize),
200                  * but instead 512 byte (2**9) size is required for
201                  * calculating num blocks.
202                  */
203                 inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
204         }
205         spin_unlock(&inode->i_lock);
206
207         if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL)
208                 inode->i_flags |= S_AUTOMOUNT;
209         if (inode->i_state & I_NEW)
210                 cifs_set_ops(inode);
211 }
212
213 void
214 cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
215 {
216         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
217
218         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
219                 return;
220
221         fattr->cf_uniqueid = iunique(sb, ROOT_I);
222 }
223
224 /* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
225 void
226 cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
227                          struct cifs_sb_info *cifs_sb)
228 {
229         memset(fattr, 0, sizeof(*fattr));
230         fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
231         fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
232         fattr->cf_eof = le64_to_cpu(info->EndOfFile);
233
234         fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
235         fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime);
236         fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange);
237         /* old POSIX extensions don't get create time */
238
239         fattr->cf_mode = le64_to_cpu(info->Permissions);
240
241         /*
242          * Since we set the inode type below we need to mask off
243          * to avoid strange results if bits set above.
244          */
245         fattr->cf_mode &= ~S_IFMT;
246         switch (le32_to_cpu(info->Type)) {
247         case UNIX_FILE:
248                 fattr->cf_mode |= S_IFREG;
249                 fattr->cf_dtype = DT_REG;
250                 break;
251         case UNIX_SYMLINK:
252                 fattr->cf_mode |= S_IFLNK;
253                 fattr->cf_dtype = DT_LNK;
254                 break;
255         case UNIX_DIR:
256                 fattr->cf_mode |= S_IFDIR;
257                 fattr->cf_dtype = DT_DIR;
258                 break;
259         case UNIX_CHARDEV:
260                 fattr->cf_mode |= S_IFCHR;
261                 fattr->cf_dtype = DT_CHR;
262                 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
263                                        le64_to_cpu(info->DevMinor) & MINORMASK);
264                 break;
265         case UNIX_BLOCKDEV:
266                 fattr->cf_mode |= S_IFBLK;
267                 fattr->cf_dtype = DT_BLK;
268                 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
269                                        le64_to_cpu(info->DevMinor) & MINORMASK);
270                 break;
271         case UNIX_FIFO:
272                 fattr->cf_mode |= S_IFIFO;
273                 fattr->cf_dtype = DT_FIFO;
274                 break;
275         case UNIX_SOCKET:
276                 fattr->cf_mode |= S_IFSOCK;
277                 fattr->cf_dtype = DT_SOCK;
278                 break;
279         default:
280                 /* safest to call it a file if we do not know */
281                 fattr->cf_mode |= S_IFREG;
282                 fattr->cf_dtype = DT_REG;
283                 cifs_dbg(FYI, "unknown type %d\n", le32_to_cpu(info->Type));
284                 break;
285         }
286
287         fattr->cf_uid = cifs_sb->mnt_uid;
288         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)) {
289                 u64 id = le64_to_cpu(info->Uid);
290                 if (id < ((uid_t)-1)) {
291                         kuid_t uid = make_kuid(&init_user_ns, id);
292                         if (uid_valid(uid))
293                                 fattr->cf_uid = uid;
294                 }
295         }
296         
297         fattr->cf_gid = cifs_sb->mnt_gid;
298         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)) {
299                 u64 id = le64_to_cpu(info->Gid);
300                 if (id < ((gid_t)-1)) {
301                         kgid_t gid = make_kgid(&init_user_ns, id);
302                         if (gid_valid(gid))
303                                 fattr->cf_gid = gid;
304                 }
305         }
306
307         fattr->cf_nlink = le64_to_cpu(info->Nlinks);
308 }
309
310 /*
311  * Fill a cifs_fattr struct with fake inode info.
312  *
313  * Needed to setup cifs_fattr data for the directory which is the
314  * junction to the new submount (ie to setup the fake directory
315  * which represents a DFS referral).
316  */
317 static void
318 cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
319 {
320         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
321
322         cifs_dbg(FYI, "creating fake fattr for DFS referral\n");
323
324         memset(fattr, 0, sizeof(*fattr));
325         fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
326         fattr->cf_uid = cifs_sb->mnt_uid;
327         fattr->cf_gid = cifs_sb->mnt_gid;
328         ktime_get_real_ts(&fattr->cf_mtime);
329         fattr->cf_mtime = timespec_trunc(fattr->cf_mtime, sb->s_time_gran);
330         fattr->cf_atime = fattr->cf_ctime = fattr->cf_mtime;
331         fattr->cf_nlink = 2;
332         fattr->cf_flags |= CIFS_FATTR_DFS_REFERRAL;
333 }
334
335 static int
336 cifs_get_file_info_unix(struct file *filp)
337 {
338         int rc;
339         unsigned int xid;
340         FILE_UNIX_BASIC_INFO find_data;
341         struct cifs_fattr fattr;
342         struct inode *inode = file_inode(filp);
343         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
344         struct cifsFileInfo *cfile = filp->private_data;
345         struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
346
347         xid = get_xid();
348         rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->fid.netfid, &find_data);
349         if (!rc) {
350                 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
351         } else if (rc == -EREMOTE) {
352                 cifs_create_dfs_fattr(&fattr, inode->i_sb);
353                 rc = 0;
354         }
355
356         cifs_fattr_to_inode(inode, &fattr);
357         free_xid(xid);
358         return rc;
359 }
360
361 int cifs_get_inode_info_unix(struct inode **pinode,
362                              const unsigned char *full_path,
363                              struct super_block *sb, unsigned int xid)
364 {
365         int rc;
366         FILE_UNIX_BASIC_INFO find_data;
367         struct cifs_fattr fattr;
368         struct cifs_tcon *tcon;
369         struct tcon_link *tlink;
370         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
371
372         cifs_dbg(FYI, "Getting info on %s\n", full_path);
373
374         tlink = cifs_sb_tlink(cifs_sb);
375         if (IS_ERR(tlink))
376                 return PTR_ERR(tlink);
377         tcon = tlink_tcon(tlink);
378
379         /* could have done a find first instead but this returns more info */
380         rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
381                                   cifs_sb->local_nls, cifs_remap(cifs_sb));
382         cifs_put_tlink(tlink);
383
384         if (!rc) {
385                 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
386         } else if (rc == -EREMOTE) {
387                 cifs_create_dfs_fattr(&fattr, sb);
388                 rc = 0;
389         } else {
390                 return rc;
391         }
392
393         /* check for Minshall+French symlinks */
394         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
395                 int tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
396                                              full_path);
397                 if (tmprc)
398                         cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
399         }
400
401         if (*pinode == NULL) {
402                 /* get new inode */
403                 cifs_fill_uniqueid(sb, &fattr);
404                 *pinode = cifs_iget(sb, &fattr);
405                 if (!*pinode)
406                         rc = -ENOMEM;
407         } else {
408                 /* we already have inode, update it */
409
410                 /* if uniqueid is different, return error */
411                 if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
412                     CIFS_I(*pinode)->uniqueid != fattr.cf_uniqueid)) {
413                         rc = -ESTALE;
414                         goto cgiiu_exit;
415                 }
416
417                 /* if filetype is different, return error */
418                 if (unlikely(((*pinode)->i_mode & S_IFMT) !=
419                     (fattr.cf_mode & S_IFMT))) {
420                         rc = -ESTALE;
421                         goto cgiiu_exit;
422                 }
423
424                 cifs_fattr_to_inode(*pinode, &fattr);
425         }
426
427 cgiiu_exit:
428         return rc;
429 }
430
431 static int
432 cifs_sfu_type(struct cifs_fattr *fattr, const char *path,
433               struct cifs_sb_info *cifs_sb, unsigned int xid)
434 {
435         int rc;
436         __u32 oplock;
437         struct tcon_link *tlink;
438         struct cifs_tcon *tcon;
439         struct cifs_fid fid;
440         struct cifs_open_parms oparms;
441         struct cifs_io_parms io_parms;
442         char buf[24];
443         unsigned int bytes_read;
444         char *pbuf;
445         int buf_type = CIFS_NO_BUFFER;
446
447         pbuf = buf;
448
449         fattr->cf_mode &= ~S_IFMT;
450
451         if (fattr->cf_eof == 0) {
452                 fattr->cf_mode |= S_IFIFO;
453                 fattr->cf_dtype = DT_FIFO;
454                 return 0;
455         } else if (fattr->cf_eof < 8) {
456                 fattr->cf_mode |= S_IFREG;
457                 fattr->cf_dtype = DT_REG;
458                 return -EINVAL;  /* EOPNOTSUPP? */
459         }
460
461         tlink = cifs_sb_tlink(cifs_sb);
462         if (IS_ERR(tlink))
463                 return PTR_ERR(tlink);
464         tcon = tlink_tcon(tlink);
465
466         oparms.tcon = tcon;
467         oparms.cifs_sb = cifs_sb;
468         oparms.desired_access = GENERIC_READ;
469         oparms.create_options = CREATE_NOT_DIR;
470         oparms.disposition = FILE_OPEN;
471         oparms.path = path;
472         oparms.fid = &fid;
473         oparms.reconnect = false;
474
475         if (tcon->ses->server->oplocks)
476                 oplock = REQ_OPLOCK;
477         else
478                 oplock = 0;
479         rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, NULL);
480         if (rc) {
481                 cifs_dbg(FYI, "check sfu type of %s, open rc = %d\n", path, rc);
482                 cifs_put_tlink(tlink);
483                 return rc;
484         }
485
486         /* Read header */
487         io_parms.netfid = fid.netfid;
488         io_parms.pid = current->tgid;
489         io_parms.tcon = tcon;
490         io_parms.offset = 0;
491         io_parms.length = 24;
492
493         rc = tcon->ses->server->ops->sync_read(xid, &fid, &io_parms,
494                                         &bytes_read, &pbuf, &buf_type);
495         if ((rc == 0) && (bytes_read >= 8)) {
496                 if (memcmp("IntxBLK", pbuf, 8) == 0) {
497                         cifs_dbg(FYI, "Block device\n");
498                         fattr->cf_mode |= S_IFBLK;
499                         fattr->cf_dtype = DT_BLK;
500                         if (bytes_read == 24) {
501                                 /* we have enough to decode dev num */
502                                 __u64 mjr; /* major */
503                                 __u64 mnr; /* minor */
504                                 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
505                                 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
506                                 fattr->cf_rdev = MKDEV(mjr, mnr);
507                         }
508                 } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
509                         cifs_dbg(FYI, "Char device\n");
510                         fattr->cf_mode |= S_IFCHR;
511                         fattr->cf_dtype = DT_CHR;
512                         if (bytes_read == 24) {
513                                 /* we have enough to decode dev num */
514                                 __u64 mjr; /* major */
515                                 __u64 mnr; /* minor */
516                                 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
517                                 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
518                                 fattr->cf_rdev = MKDEV(mjr, mnr);
519                         }
520                 } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
521                         cifs_dbg(FYI, "Symlink\n");
522                         fattr->cf_mode |= S_IFLNK;
523                         fattr->cf_dtype = DT_LNK;
524                 } else {
525                         fattr->cf_mode |= S_IFREG; /* file? */
526                         fattr->cf_dtype = DT_REG;
527                         rc = -EOPNOTSUPP;
528                 }
529         } else {
530                 fattr->cf_mode |= S_IFREG; /* then it is a file */
531                 fattr->cf_dtype = DT_REG;
532                 rc = -EOPNOTSUPP; /* or some unknown SFU type */
533         }
534
535         tcon->ses->server->ops->close(xid, tcon, &fid);
536         cifs_put_tlink(tlink);
537         return rc;
538 }
539
540 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */
541
542 /*
543  * Fetch mode bits as provided by SFU.
544  *
545  * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ?
546  */
547 static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
548                          struct cifs_sb_info *cifs_sb, unsigned int xid)
549 {
550 #ifdef CONFIG_CIFS_XATTR
551         ssize_t rc;
552         char ea_value[4];
553         __u32 mode;
554         struct tcon_link *tlink;
555         struct cifs_tcon *tcon;
556
557         tlink = cifs_sb_tlink(cifs_sb);
558         if (IS_ERR(tlink))
559                 return PTR_ERR(tlink);
560         tcon = tlink_tcon(tlink);
561
562         if (tcon->ses->server->ops->query_all_EAs == NULL) {
563                 cifs_put_tlink(tlink);
564                 return -EOPNOTSUPP;
565         }
566
567         rc = tcon->ses->server->ops->query_all_EAs(xid, tcon, path,
568                         "SETFILEBITS", ea_value, 4 /* size of buf */,
569                         cifs_sb);
570         cifs_put_tlink(tlink);
571         if (rc < 0)
572                 return (int)rc;
573         else if (rc > 3) {
574                 mode = le32_to_cpu(*((__le32 *)ea_value));
575                 fattr->cf_mode &= ~SFBITS_MASK;
576                 cifs_dbg(FYI, "special bits 0%o org mode 0%o\n",
577                          mode, fattr->cf_mode);
578                 fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode;
579                 cifs_dbg(FYI, "special mode bits 0%o\n", mode);
580         }
581
582         return 0;
583 #else
584         return -EOPNOTSUPP;
585 #endif
586 }
587
588 /* Fill a cifs_fattr struct with info from FILE_ALL_INFO */
589 static void
590 cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
591                        struct super_block *sb, bool adjust_tz,
592                        bool symlink)
593 {
594         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
595         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
596
597         memset(fattr, 0, sizeof(*fattr));
598         fattr->cf_cifsattrs = le32_to_cpu(info->Attributes);
599         if (info->DeletePending)
600                 fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING;
601
602         if (info->LastAccessTime)
603                 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
604         else {
605                 ktime_get_real_ts(&fattr->cf_atime);
606                 fattr->cf_atime = timespec_trunc(fattr->cf_atime, sb->s_time_gran);
607         }
608
609         fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
610         fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
611
612         if (adjust_tz) {
613                 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
614                 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
615         }
616
617         fattr->cf_eof = le64_to_cpu(info->EndOfFile);
618         fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
619         fattr->cf_createtime = le64_to_cpu(info->CreationTime);
620
621         fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
622
623         if (symlink) {
624                 fattr->cf_mode = S_IFLNK;
625                 fattr->cf_dtype = DT_LNK;
626         } else if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
627                 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
628                 fattr->cf_dtype = DT_DIR;
629                 /*
630                  * Server can return wrong NumberOfLinks value for directories
631                  * when Unix extensions are disabled - fake it.
632                  */
633                 if (!tcon->unix_ext)
634                         fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
635         } else {
636                 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
637                 fattr->cf_dtype = DT_REG;
638
639                 /* clear write bits if ATTR_READONLY is set */
640                 if (fattr->cf_cifsattrs & ATTR_READONLY)
641                         fattr->cf_mode &= ~(S_IWUGO);
642
643                 /*
644                  * Don't accept zero nlink from non-unix servers unless
645                  * delete is pending.  Instead mark it as unknown.
646                  */
647                 if ((fattr->cf_nlink < 1) && !tcon->unix_ext &&
648                     !info->DeletePending) {
649                         cifs_dbg(1, "bogus file nlink value %u\n",
650                                 fattr->cf_nlink);
651                         fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
652                 }
653         }
654
655         fattr->cf_uid = cifs_sb->mnt_uid;
656         fattr->cf_gid = cifs_sb->mnt_gid;
657 }
658
659 static int
660 cifs_get_file_info(struct file *filp)
661 {
662         int rc;
663         unsigned int xid;
664         FILE_ALL_INFO find_data;
665         struct cifs_fattr fattr;
666         struct inode *inode = file_inode(filp);
667         struct cifsFileInfo *cfile = filp->private_data;
668         struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
669         struct TCP_Server_Info *server = tcon->ses->server;
670
671         if (!server->ops->query_file_info)
672                 return -ENOSYS;
673
674         xid = get_xid();
675         rc = server->ops->query_file_info(xid, tcon, &cfile->fid, &find_data);
676         switch (rc) {
677         case 0:
678                 cifs_all_info_to_fattr(&fattr, &find_data, inode->i_sb, false,
679                                        false);
680                 break;
681         case -EREMOTE:
682                 cifs_create_dfs_fattr(&fattr, inode->i_sb);
683                 rc = 0;
684                 break;
685         case -EOPNOTSUPP:
686         case -EINVAL:
687                 /*
688                  * FIXME: legacy server -- fall back to path-based call?
689                  * for now, just skip revalidating and mark inode for
690                  * immediate reval.
691                  */
692                 rc = 0;
693                 CIFS_I(inode)->time = 0;
694         default:
695                 goto cgfi_exit;
696         }
697
698         /*
699          * don't bother with SFU junk here -- just mark inode as needing
700          * revalidation.
701          */
702         fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
703         fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
704         cifs_fattr_to_inode(inode, &fattr);
705 cgfi_exit:
706         free_xid(xid);
707         return rc;
708 }
709
710 /* Simple function to return a 64 bit hash of string.  Rarely called */
711 static __u64 simple_hashstr(const char *str)
712 {
713         const __u64 hash_mult =  1125899906842597ULL; /* a big enough prime */
714         __u64 hash = 0;
715
716         while (*str)
717                 hash = (hash + (__u64) *str++) * hash_mult;
718
719         return hash;
720 }
721
722 int
723 cifs_get_inode_info(struct inode **inode, const char *full_path,
724                     FILE_ALL_INFO *data, struct super_block *sb, int xid,
725                     const struct cifs_fid *fid)
726 {
727         bool validinum = false;
728         __u16 srchflgs;
729         int rc = 0, tmprc = ENOSYS;
730         struct cifs_tcon *tcon;
731         struct TCP_Server_Info *server;
732         struct tcon_link *tlink;
733         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
734         char *buf = NULL;
735         bool adjust_tz = false;
736         struct cifs_fattr fattr;
737         struct cifs_search_info *srchinf = NULL;
738         bool symlink = false;
739
740         tlink = cifs_sb_tlink(cifs_sb);
741         if (IS_ERR(tlink))
742                 return PTR_ERR(tlink);
743         tcon = tlink_tcon(tlink);
744         server = tcon->ses->server;
745
746         cifs_dbg(FYI, "Getting info on %s\n", full_path);
747
748         if ((data == NULL) && (*inode != NULL)) {
749                 if (CIFS_CACHE_READ(CIFS_I(*inode)) &&
750                     CIFS_I(*inode)->time != 0) {
751                         cifs_dbg(FYI, "No need to revalidate cached inode sizes\n");
752                         goto cgii_exit;
753                 }
754         }
755
756         /* if inode info is not passed, get it from server */
757         if (data == NULL) {
758                 if (!server->ops->query_path_info) {
759                         rc = -ENOSYS;
760                         goto cgii_exit;
761                 }
762                 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
763                 if (buf == NULL) {
764                         rc = -ENOMEM;
765                         goto cgii_exit;
766                 }
767                 data = (FILE_ALL_INFO *)buf;
768                 rc = server->ops->query_path_info(xid, tcon, cifs_sb, full_path,
769                                                   data, &adjust_tz, &symlink);
770         }
771
772         if (!rc) {
773                 cifs_all_info_to_fattr(&fattr, data, sb, adjust_tz,
774                                        symlink);
775         } else if (rc == -EREMOTE) {
776                 cifs_create_dfs_fattr(&fattr, sb);
777                 rc = 0;
778         } else if (rc == -EACCES && backup_cred(cifs_sb)) {
779                         srchinf = kzalloc(sizeof(struct cifs_search_info),
780                                                 GFP_KERNEL);
781                         if (srchinf == NULL) {
782                                 rc = -ENOMEM;
783                                 goto cgii_exit;
784                         }
785
786                         srchinf->endOfSearch = false;
787                         srchinf->info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
788
789                         srchflgs = CIFS_SEARCH_CLOSE_ALWAYS |
790                                         CIFS_SEARCH_CLOSE_AT_END |
791                                         CIFS_SEARCH_BACKUP_SEARCH;
792
793                         rc = CIFSFindFirst(xid, tcon, full_path,
794                                 cifs_sb, NULL, srchflgs, srchinf, false);
795                         if (!rc) {
796                                 data =
797                                 (FILE_ALL_INFO *)srchinf->srch_entries_start;
798
799                                 cifs_dir_info_to_fattr(&fattr,
800                                 (FILE_DIRECTORY_INFO *)data, cifs_sb);
801                                 fattr.cf_uniqueid = le64_to_cpu(
802                                 ((SEARCH_ID_FULL_DIR_INFO *)data)->UniqueId);
803                                 validinum = true;
804
805                                 cifs_buf_release(srchinf->ntwrk_buf_start);
806                         }
807                         kfree(srchinf);
808                         if (rc)
809                                 goto cgii_exit;
810         } else
811                 goto cgii_exit;
812
813         /*
814          * If an inode wasn't passed in, then get the inode number
815          *
816          * Is an i_ino of zero legal? Can we use that to check if the server
817          * supports returning inode numbers?  Are there other sanity checks we
818          * can use to ensure that the server is really filling in that field?
819          */
820         if (*inode == NULL) {
821                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
822                         if (validinum == false) {
823                                 if (server->ops->get_srv_inum)
824                                         tmprc = server->ops->get_srv_inum(xid,
825                                                 tcon, cifs_sb, full_path,
826                                                 &fattr.cf_uniqueid, data);
827                                 if (tmprc) {
828                                         cifs_dbg(FYI, "GetSrvInodeNum rc %d\n",
829                                                  tmprc);
830                                         fattr.cf_uniqueid = iunique(sb, ROOT_I);
831                                         cifs_autodisable_serverino(cifs_sb);
832                                 } else if ((fattr.cf_uniqueid == 0) &&
833                                                 strlen(full_path) == 0) {
834                                         /* some servers ret bad root ino ie 0 */
835                                         cifs_dbg(FYI, "Invalid (0) inodenum\n");
836                                         fattr.cf_flags |=
837                                                 CIFS_FATTR_FAKE_ROOT_INO;
838                                         fattr.cf_uniqueid =
839                                                 simple_hashstr(tcon->treeName);
840                                 }
841                         }
842                 } else
843                         fattr.cf_uniqueid = iunique(sb, ROOT_I);
844         } else {
845                 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
846                     validinum == false && server->ops->get_srv_inum) {
847                         /*
848                          * Pass a NULL tcon to ensure we don't make a round
849                          * trip to the server. This only works for SMB2+.
850                          */
851                         tmprc = server->ops->get_srv_inum(xid,
852                                 NULL, cifs_sb, full_path,
853                                 &fattr.cf_uniqueid, data);
854                         if (tmprc)
855                                 fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
856                         else if ((fattr.cf_uniqueid == 0) &&
857                                         strlen(full_path) == 0) {
858                                 /*
859                                  * Reuse existing root inode num since
860                                  * inum zero for root causes ls of . and .. to
861                                  * not be returned
862                                  */
863                                 cifs_dbg(FYI, "Srv ret 0 inode num for root\n");
864                                 fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
865                         }
866                 } else
867                         fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
868         }
869
870         /* query for SFU type info if supported and needed */
871         if (fattr.cf_cifsattrs & ATTR_SYSTEM &&
872             cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
873                 tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid);
874                 if (tmprc)
875                         cifs_dbg(FYI, "cifs_sfu_type failed: %d\n", tmprc);
876         }
877
878 #ifdef CONFIG_CIFS_ACL
879         /* fill in 0777 bits from ACL */
880         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
881                 rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, full_path, fid);
882                 if (rc) {
883                         cifs_dbg(FYI, "%s: Getting ACL failed with error: %d\n",
884                                  __func__, rc);
885                         goto cgii_exit;
886                 }
887         }
888 #endif /* CONFIG_CIFS_ACL */
889
890         /* fill in remaining high mode bits e.g. SUID, VTX */
891         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
892                 cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
893
894         /* check for Minshall+French symlinks */
895         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
896                 tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
897                                          full_path);
898                 if (tmprc)
899                         cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
900         }
901
902         if (!*inode) {
903                 *inode = cifs_iget(sb, &fattr);
904                 if (!*inode)
905                         rc = -ENOMEM;
906         } else {
907                 /* we already have inode, update it */
908
909                 /* if uniqueid is different, return error */
910                 if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
911                     CIFS_I(*inode)->uniqueid != fattr.cf_uniqueid)) {
912                         rc = -ESTALE;
913                         goto cgii_exit;
914                 }
915
916                 /* if filetype is different, return error */
917                 if (unlikely(((*inode)->i_mode & S_IFMT) !=
918                     (fattr.cf_mode & S_IFMT))) {
919                         rc = -ESTALE;
920                         goto cgii_exit;
921                 }
922
923                 cifs_fattr_to_inode(*inode, &fattr);
924         }
925
926 cgii_exit:
927         if ((*inode) && ((*inode)->i_ino == 0))
928                 cifs_dbg(FYI, "inode number of zero returned\n");
929
930         kfree(buf);
931         cifs_put_tlink(tlink);
932         return rc;
933 }
934
935 static const struct inode_operations cifs_ipc_inode_ops = {
936         .lookup = cifs_lookup,
937 };
938
939 static int
940 cifs_find_inode(struct inode *inode, void *opaque)
941 {
942         struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
943
944         /* don't match inode with different uniqueid */
945         if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
946                 return 0;
947
948         /* use createtime like an i_generation field */
949         if (CIFS_I(inode)->createtime != fattr->cf_createtime)
950                 return 0;
951
952         /* don't match inode of different type */
953         if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT))
954                 return 0;
955
956         /* if it's not a directory or has no dentries, then flag it */
957         if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry))
958                 fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
959
960         return 1;
961 }
962
963 static int
964 cifs_init_inode(struct inode *inode, void *opaque)
965 {
966         struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
967
968         CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
969         CIFS_I(inode)->createtime = fattr->cf_createtime;
970         return 0;
971 }
972
973 /*
974  * walk dentry list for an inode and report whether it has aliases that
975  * are hashed. We use this to determine if a directory inode can actually
976  * be used.
977  */
978 static bool
979 inode_has_hashed_dentries(struct inode *inode)
980 {
981         struct dentry *dentry;
982
983         spin_lock(&inode->i_lock);
984         hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) {
985                 if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
986                         spin_unlock(&inode->i_lock);
987                         return true;
988                 }
989         }
990         spin_unlock(&inode->i_lock);
991         return false;
992 }
993
994 /* Given fattrs, get a corresponding inode */
995 struct inode *
996 cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
997 {
998         unsigned long hash;
999         struct inode *inode;
1000
1001 retry_iget5_locked:
1002         cifs_dbg(FYI, "looking for uniqueid=%llu\n", fattr->cf_uniqueid);
1003
1004         /* hash down to 32-bits on 32-bit arch */
1005         hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
1006
1007         inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
1008         if (inode) {
1009                 /* was there a potentially problematic inode collision? */
1010                 if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
1011                         fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
1012
1013                         if (inode_has_hashed_dentries(inode)) {
1014                                 cifs_autodisable_serverino(CIFS_SB(sb));
1015                                 iput(inode);
1016                                 fattr->cf_uniqueid = iunique(sb, ROOT_I);
1017                                 goto retry_iget5_locked;
1018                         }
1019                 }
1020
1021                 cifs_fattr_to_inode(inode, fattr);
1022                 if (sb->s_flags & SB_NOATIME)
1023                         inode->i_flags |= S_NOATIME | S_NOCMTIME;
1024                 if (inode->i_state & I_NEW) {
1025                         inode->i_ino = hash;
1026 #ifdef CONFIG_CIFS_FSCACHE
1027                         /* initialize per-inode cache cookie pointer */
1028                         CIFS_I(inode)->fscache = NULL;
1029 #endif
1030                         unlock_new_inode(inode);
1031                 }
1032         }
1033
1034         return inode;
1035 }
1036
1037 /* gets root inode */
1038 struct inode *cifs_root_iget(struct super_block *sb)
1039 {
1040         unsigned int xid;
1041         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1042         struct inode *inode = NULL;
1043         long rc;
1044         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
1045         char *path = NULL;
1046         int len;
1047
1048         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
1049             && cifs_sb->prepath) {
1050                 len = strlen(cifs_sb->prepath);
1051                 path = kzalloc(len + 2 /* leading sep + null */, GFP_KERNEL);
1052                 if (path == NULL)
1053                         return ERR_PTR(-ENOMEM);
1054                 path[0] = '/';
1055                 memcpy(path+1, cifs_sb->prepath, len);
1056         } else {
1057                 path = kstrdup("", GFP_KERNEL);
1058                 if (path == NULL)
1059                         return ERR_PTR(-ENOMEM);
1060         }
1061
1062         xid = get_xid();
1063         if (tcon->unix_ext) {
1064                 rc = cifs_get_inode_info_unix(&inode, path, sb, xid);
1065                 /* some servers mistakenly claim POSIX support */
1066                 if (rc != -EOPNOTSUPP)
1067                         goto iget_no_retry;
1068                 cifs_dbg(VFS, "server does not support POSIX extensions");
1069                 tcon->unix_ext = false;
1070         }
1071
1072         convert_delimiter(path, CIFS_DIR_SEP(cifs_sb));
1073         rc = cifs_get_inode_info(&inode, path, NULL, sb, xid, NULL);
1074
1075 iget_no_retry:
1076         if (!inode) {
1077                 inode = ERR_PTR(rc);
1078                 goto out;
1079         }
1080
1081 #ifdef CONFIG_CIFS_FSCACHE
1082         /* populate tcon->resource_id */
1083         tcon->resource_id = CIFS_I(inode)->uniqueid;
1084 #endif
1085
1086         if (rc && tcon->pipe) {
1087                 cifs_dbg(FYI, "ipc connection - fake read inode\n");
1088                 spin_lock(&inode->i_lock);
1089                 inode->i_mode |= S_IFDIR;
1090                 set_nlink(inode, 2);
1091                 inode->i_op = &cifs_ipc_inode_ops;
1092                 inode->i_fop = &simple_dir_operations;
1093                 inode->i_uid = cifs_sb->mnt_uid;
1094                 inode->i_gid = cifs_sb->mnt_gid;
1095                 spin_unlock(&inode->i_lock);
1096         } else if (rc) {
1097                 iget_failed(inode);
1098                 inode = ERR_PTR(rc);
1099         }
1100
1101 out:
1102         kfree(path);
1103         free_xid(xid);
1104         return inode;
1105 }
1106
1107 int
1108 cifs_set_file_info(struct inode *inode, struct iattr *attrs, unsigned int xid,
1109                    char *full_path, __u32 dosattr)
1110 {
1111         bool set_time = false;
1112         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1113         struct TCP_Server_Info *server;
1114         FILE_BASIC_INFO info_buf;
1115
1116         if (attrs == NULL)
1117                 return -EINVAL;
1118
1119         server = cifs_sb_master_tcon(cifs_sb)->ses->server;
1120         if (!server->ops->set_file_info)
1121                 return -ENOSYS;
1122
1123         if (attrs->ia_valid & ATTR_ATIME) {
1124                 set_time = true;
1125                 info_buf.LastAccessTime =
1126                         cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1127         } else
1128                 info_buf.LastAccessTime = 0;
1129
1130         if (attrs->ia_valid & ATTR_MTIME) {
1131                 set_time = true;
1132                 info_buf.LastWriteTime =
1133                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1134         } else
1135                 info_buf.LastWriteTime = 0;
1136
1137         /*
1138          * Samba throws this field away, but windows may actually use it.
1139          * Do not set ctime unless other time stamps are changed explicitly
1140          * (i.e. by utimes()) since we would then have a mix of client and
1141          * server times.
1142          */
1143         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1144                 cifs_dbg(FYI, "CIFS - CTIME changed\n");
1145                 info_buf.ChangeTime =
1146                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1147         } else
1148                 info_buf.ChangeTime = 0;
1149
1150         info_buf.CreationTime = 0;      /* don't change */
1151         info_buf.Attributes = cpu_to_le32(dosattr);
1152
1153         return server->ops->set_file_info(inode, full_path, &info_buf, xid);
1154 }
1155
1156 /*
1157  * Open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
1158  * and rename it to a random name that hopefully won't conflict with
1159  * anything else.
1160  */
1161 int
1162 cifs_rename_pending_delete(const char *full_path, struct dentry *dentry,
1163                            const unsigned int xid)
1164 {
1165         int oplock = 0;
1166         int rc;
1167         struct cifs_fid fid;
1168         struct cifs_open_parms oparms;
1169         struct inode *inode = d_inode(dentry);
1170         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1171         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1172         struct tcon_link *tlink;
1173         struct cifs_tcon *tcon;
1174         __u32 dosattr, origattr;
1175         FILE_BASIC_INFO *info_buf = NULL;
1176
1177         tlink = cifs_sb_tlink(cifs_sb);
1178         if (IS_ERR(tlink))
1179                 return PTR_ERR(tlink);
1180         tcon = tlink_tcon(tlink);
1181
1182         /*
1183          * We cannot rename the file if the server doesn't support
1184          * CAP_INFOLEVEL_PASSTHRU
1185          */
1186         if (!(tcon->ses->capabilities & CAP_INFOLEVEL_PASSTHRU)) {
1187                 rc = -EBUSY;
1188                 goto out;
1189         }
1190
1191         oparms.tcon = tcon;
1192         oparms.cifs_sb = cifs_sb;
1193         oparms.desired_access = DELETE | FILE_WRITE_ATTRIBUTES;
1194         oparms.create_options = CREATE_NOT_DIR;
1195         oparms.disposition = FILE_OPEN;
1196         oparms.path = full_path;
1197         oparms.fid = &fid;
1198         oparms.reconnect = false;
1199
1200         rc = CIFS_open(xid, &oparms, &oplock, NULL);
1201         if (rc != 0)
1202                 goto out;
1203
1204         origattr = cifsInode->cifsAttrs;
1205         if (origattr == 0)
1206                 origattr |= ATTR_NORMAL;
1207
1208         dosattr = origattr & ~ATTR_READONLY;
1209         if (dosattr == 0)
1210                 dosattr |= ATTR_NORMAL;
1211         dosattr |= ATTR_HIDDEN;
1212
1213         /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
1214         if (dosattr != origattr) {
1215                 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
1216                 if (info_buf == NULL) {
1217                         rc = -ENOMEM;
1218                         goto out_close;
1219                 }
1220                 info_buf->Attributes = cpu_to_le32(dosattr);
1221                 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid,
1222                                         current->tgid);
1223                 /* although we would like to mark the file hidden
1224                    if that fails we will still try to rename it */
1225                 if (!rc)
1226                         cifsInode->cifsAttrs = dosattr;
1227                 else
1228                         dosattr = origattr; /* since not able to change them */
1229         }
1230
1231         /* rename the file */
1232         rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, NULL,
1233                                    cifs_sb->local_nls,
1234                                    cifs_remap(cifs_sb));
1235         if (rc != 0) {
1236                 rc = -EBUSY;
1237                 goto undo_setattr;
1238         }
1239
1240         /* try to set DELETE_ON_CLOSE */
1241         if (!test_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags)) {
1242                 rc = CIFSSMBSetFileDisposition(xid, tcon, true, fid.netfid,
1243                                                current->tgid);
1244                 /*
1245                  * some samba versions return -ENOENT when we try to set the
1246                  * file disposition here. Likely a samba bug, but work around
1247                  * it for now. This means that some cifsXXX files may hang
1248                  * around after they shouldn't.
1249                  *
1250                  * BB: remove this hack after more servers have the fix
1251                  */
1252                 if (rc == -ENOENT)
1253                         rc = 0;
1254                 else if (rc != 0) {
1255                         rc = -EBUSY;
1256                         goto undo_rename;
1257                 }
1258                 set_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags);
1259         }
1260
1261 out_close:
1262         CIFSSMBClose(xid, tcon, fid.netfid);
1263 out:
1264         kfree(info_buf);
1265         cifs_put_tlink(tlink);
1266         return rc;
1267
1268         /*
1269          * reset everything back to the original state. Don't bother
1270          * dealing with errors here since we can't do anything about
1271          * them anyway.
1272          */
1273 undo_rename:
1274         CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, dentry->d_name.name,
1275                                 cifs_sb->local_nls, cifs_remap(cifs_sb));
1276 undo_setattr:
1277         if (dosattr != origattr) {
1278                 info_buf->Attributes = cpu_to_le32(origattr);
1279                 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid,
1280                                         current->tgid))
1281                         cifsInode->cifsAttrs = origattr;
1282         }
1283
1284         goto out_close;
1285 }
1286
1287 /* copied from fs/nfs/dir.c with small changes */
1288 static void
1289 cifs_drop_nlink(struct inode *inode)
1290 {
1291         spin_lock(&inode->i_lock);
1292         if (inode->i_nlink > 0)
1293                 drop_nlink(inode);
1294         spin_unlock(&inode->i_lock);
1295 }
1296
1297 /*
1298  * If d_inode(dentry) is null (usually meaning the cached dentry
1299  * is a negative dentry) then we would attempt a standard SMB delete, but
1300  * if that fails we can not attempt the fall back mechanisms on EACCESS
1301  * but will return the EACCESS to the caller. Note that the VFS does not call
1302  * unlink on negative dentries currently.
1303  */
1304 int cifs_unlink(struct inode *dir, struct dentry *dentry)
1305 {
1306         int rc = 0;
1307         unsigned int xid;
1308         char *full_path = NULL;
1309         struct inode *inode = d_inode(dentry);
1310         struct cifsInodeInfo *cifs_inode;
1311         struct super_block *sb = dir->i_sb;
1312         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1313         struct tcon_link *tlink;
1314         struct cifs_tcon *tcon;
1315         struct TCP_Server_Info *server;
1316         struct iattr *attrs = NULL;
1317         __u32 dosattr = 0, origattr = 0;
1318
1319         cifs_dbg(FYI, "cifs_unlink, dir=0x%p, dentry=0x%p\n", dir, dentry);
1320
1321         tlink = cifs_sb_tlink(cifs_sb);
1322         if (IS_ERR(tlink))
1323                 return PTR_ERR(tlink);
1324         tcon = tlink_tcon(tlink);
1325         server = tcon->ses->server;
1326
1327         xid = get_xid();
1328
1329         /* Unlink can be called from rename so we can not take the
1330          * sb->s_vfs_rename_mutex here */
1331         full_path = build_path_from_dentry(dentry);
1332         if (full_path == NULL) {
1333                 rc = -ENOMEM;
1334                 goto unlink_out;
1335         }
1336
1337         if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1338                                 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1339                 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
1340                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
1341                         cifs_remap(cifs_sb));
1342                 cifs_dbg(FYI, "posix del rc %d\n", rc);
1343                 if ((rc == 0) || (rc == -ENOENT))
1344                         goto psx_del_no_retry;
1345         }
1346
1347 retry_std_delete:
1348         if (!server->ops->unlink) {
1349                 rc = -ENOSYS;
1350                 goto psx_del_no_retry;
1351         }
1352
1353         rc = server->ops->unlink(xid, tcon, full_path, cifs_sb);
1354
1355 psx_del_no_retry:
1356         if (!rc) {
1357                 if (inode)
1358                         cifs_drop_nlink(inode);
1359         } else if (rc == -ENOENT) {
1360                 d_drop(dentry);
1361         } else if (rc == -EBUSY) {
1362                 if (server->ops->rename_pending_delete) {
1363                         rc = server->ops->rename_pending_delete(full_path,
1364                                                                 dentry, xid);
1365                         if (rc == 0)
1366                                 cifs_drop_nlink(inode);
1367                 }
1368         } else if ((rc == -EACCES) && (dosattr == 0) && inode) {
1369                 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1370                 if (attrs == NULL) {
1371                         rc = -ENOMEM;
1372                         goto out_reval;
1373                 }
1374
1375                 /* try to reset dos attributes */
1376                 cifs_inode = CIFS_I(inode);
1377                 origattr = cifs_inode->cifsAttrs;
1378                 if (origattr == 0)
1379                         origattr |= ATTR_NORMAL;
1380                 dosattr = origattr & ~ATTR_READONLY;
1381                 if (dosattr == 0)
1382                         dosattr |= ATTR_NORMAL;
1383                 dosattr |= ATTR_HIDDEN;
1384
1385                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1386                 if (rc != 0)
1387                         goto out_reval;
1388
1389                 goto retry_std_delete;
1390         }
1391
1392         /* undo the setattr if we errored out and it's needed */
1393         if (rc != 0 && dosattr != 0)
1394                 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
1395
1396 out_reval:
1397         if (inode) {
1398                 cifs_inode = CIFS_I(inode);
1399                 cifs_inode->time = 0;   /* will force revalidate to get info
1400                                            when needed */
1401                 inode->i_ctime = current_time(inode);
1402         }
1403         dir->i_ctime = dir->i_mtime = current_time(dir);
1404         cifs_inode = CIFS_I(dir);
1405         CIFS_I(dir)->time = 0;  /* force revalidate of dir as well */
1406 unlink_out:
1407         kfree(full_path);
1408         kfree(attrs);
1409         free_xid(xid);
1410         cifs_put_tlink(tlink);
1411         return rc;
1412 }
1413
1414 static int
1415 cifs_mkdir_qinfo(struct inode *parent, struct dentry *dentry, umode_t mode,
1416                  const char *full_path, struct cifs_sb_info *cifs_sb,
1417                  struct cifs_tcon *tcon, const unsigned int xid)
1418 {
1419         int rc = 0;
1420         struct inode *inode = NULL;
1421
1422         if (tcon->unix_ext)
1423                 rc = cifs_get_inode_info_unix(&inode, full_path, parent->i_sb,
1424                                               xid);
1425         else
1426                 rc = cifs_get_inode_info(&inode, full_path, NULL, parent->i_sb,
1427                                          xid, NULL);
1428
1429         if (rc)
1430                 return rc;
1431
1432         /*
1433          * setting nlink not necessary except in cases where we failed to get it
1434          * from the server or was set bogus. Also, since this is a brand new
1435          * inode, no need to grab the i_lock before setting the i_nlink.
1436          */
1437         if (inode->i_nlink < 2)
1438                 set_nlink(inode, 2);
1439         mode &= ~current_umask();
1440         /* must turn on setgid bit if parent dir has it */
1441         if (parent->i_mode & S_ISGID)
1442                 mode |= S_ISGID;
1443
1444         if (tcon->unix_ext) {
1445                 struct cifs_unix_set_info_args args = {
1446                         .mode   = mode,
1447                         .ctime  = NO_CHANGE_64,
1448                         .atime  = NO_CHANGE_64,
1449                         .mtime  = NO_CHANGE_64,
1450                         .device = 0,
1451                 };
1452                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1453                         args.uid = current_fsuid();
1454                         if (parent->i_mode & S_ISGID)
1455                                 args.gid = parent->i_gid;
1456                         else
1457                                 args.gid = current_fsgid();
1458                 } else {
1459                         args.uid = INVALID_UID; /* no change */
1460                         args.gid = INVALID_GID; /* no change */
1461                 }
1462                 CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
1463                                        cifs_sb->local_nls,
1464                                        cifs_remap(cifs_sb));
1465         } else {
1466                 struct TCP_Server_Info *server = tcon->ses->server;
1467                 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1468                     (mode & S_IWUGO) == 0 && server->ops->mkdir_setinfo)
1469                         server->ops->mkdir_setinfo(inode, full_path, cifs_sb,
1470                                                    tcon, xid);
1471                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
1472                         inode->i_mode = (mode | S_IFDIR);
1473
1474                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1475                         inode->i_uid = current_fsuid();
1476                         if (inode->i_mode & S_ISGID)
1477                                 inode->i_gid = parent->i_gid;
1478                         else
1479                                 inode->i_gid = current_fsgid();
1480                 }
1481         }
1482         d_instantiate(dentry, inode);
1483         return rc;
1484 }
1485
1486 static int
1487 cifs_posix_mkdir(struct inode *inode, struct dentry *dentry, umode_t mode,
1488                  const char *full_path, struct cifs_sb_info *cifs_sb,
1489                  struct cifs_tcon *tcon, const unsigned int xid)
1490 {
1491         int rc = 0;
1492         u32 oplock = 0;
1493         FILE_UNIX_BASIC_INFO *info = NULL;
1494         struct inode *newinode = NULL;
1495         struct cifs_fattr fattr;
1496
1497         info = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1498         if (info == NULL) {
1499                 rc = -ENOMEM;
1500                 goto posix_mkdir_out;
1501         }
1502
1503         mode &= ~current_umask();
1504         rc = CIFSPOSIXCreate(xid, tcon, SMB_O_DIRECTORY | SMB_O_CREAT, mode,
1505                              NULL /* netfid */, info, &oplock, full_path,
1506                              cifs_sb->local_nls, cifs_remap(cifs_sb));
1507         if (rc == -EOPNOTSUPP)
1508                 goto posix_mkdir_out;
1509         else if (rc) {
1510                 cifs_dbg(FYI, "posix mkdir returned 0x%x\n", rc);
1511                 d_drop(dentry);
1512                 goto posix_mkdir_out;
1513         }
1514
1515         if (info->Type == cpu_to_le32(-1))
1516                 /* no return info, go query for it */
1517                 goto posix_mkdir_get_info;
1518         /*
1519          * BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if
1520          * need to set uid/gid.
1521          */
1522
1523         cifs_unix_basic_to_fattr(&fattr, info, cifs_sb);
1524         cifs_fill_uniqueid(inode->i_sb, &fattr);
1525         newinode = cifs_iget(inode->i_sb, &fattr);
1526         if (!newinode)
1527                 goto posix_mkdir_get_info;
1528
1529         d_instantiate(dentry, newinode);
1530
1531 #ifdef CONFIG_CIFS_DEBUG2
1532         cifs_dbg(FYI, "instantiated dentry %p %pd to inode %p\n",
1533                  dentry, dentry, newinode);
1534
1535         if (newinode->i_nlink != 2)
1536                 cifs_dbg(FYI, "unexpected number of links %d\n",
1537                          newinode->i_nlink);
1538 #endif
1539
1540 posix_mkdir_out:
1541         kfree(info);
1542         return rc;
1543 posix_mkdir_get_info:
1544         rc = cifs_mkdir_qinfo(inode, dentry, mode, full_path, cifs_sb, tcon,
1545                               xid);
1546         goto posix_mkdir_out;
1547 }
1548
1549 int cifs_mkdir(struct inode *inode, struct dentry *direntry, umode_t mode)
1550 {
1551         int rc = 0;
1552         unsigned int xid;
1553         struct cifs_sb_info *cifs_sb;
1554         struct tcon_link *tlink;
1555         struct cifs_tcon *tcon;
1556         struct TCP_Server_Info *server;
1557         char *full_path;
1558
1559         cifs_dbg(FYI, "In cifs_mkdir, mode = 0x%hx inode = 0x%p\n",
1560                  mode, inode);
1561
1562         cifs_sb = CIFS_SB(inode->i_sb);
1563         tlink = cifs_sb_tlink(cifs_sb);
1564         if (IS_ERR(tlink))
1565                 return PTR_ERR(tlink);
1566         tcon = tlink_tcon(tlink);
1567
1568         xid = get_xid();
1569
1570         full_path = build_path_from_dentry(direntry);
1571         if (full_path == NULL) {
1572                 rc = -ENOMEM;
1573                 goto mkdir_out;
1574         }
1575
1576         if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1577                                 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1578                 rc = cifs_posix_mkdir(inode, direntry, mode, full_path, cifs_sb,
1579                                       tcon, xid);
1580                 if (rc != -EOPNOTSUPP)
1581                         goto mkdir_out;
1582         }
1583
1584         server = tcon->ses->server;
1585
1586         if (!server->ops->mkdir) {
1587                 rc = -ENOSYS;
1588                 goto mkdir_out;
1589         }
1590
1591         /* BB add setting the equivalent of mode via CreateX w/ACLs */
1592         rc = server->ops->mkdir(xid, tcon, full_path, cifs_sb);
1593         if (rc) {
1594                 cifs_dbg(FYI, "cifs_mkdir returned 0x%x\n", rc);
1595                 d_drop(direntry);
1596                 goto mkdir_out;
1597         }
1598
1599         rc = cifs_mkdir_qinfo(inode, direntry, mode, full_path, cifs_sb, tcon,
1600                               xid);
1601 mkdir_out:
1602         /*
1603          * Force revalidate to get parent dir info when needed since cached
1604          * attributes are invalid now.
1605          */
1606         CIFS_I(inode)->time = 0;
1607         kfree(full_path);
1608         free_xid(xid);
1609         cifs_put_tlink(tlink);
1610         return rc;
1611 }
1612
1613 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1614 {
1615         int rc = 0;
1616         unsigned int xid;
1617         struct cifs_sb_info *cifs_sb;
1618         struct tcon_link *tlink;
1619         struct cifs_tcon *tcon;
1620         struct TCP_Server_Info *server;
1621         char *full_path = NULL;
1622         struct cifsInodeInfo *cifsInode;
1623
1624         cifs_dbg(FYI, "cifs_rmdir, inode = 0x%p\n", inode);
1625
1626         xid = get_xid();
1627
1628         full_path = build_path_from_dentry(direntry);
1629         if (full_path == NULL) {
1630                 rc = -ENOMEM;
1631                 goto rmdir_exit;
1632         }
1633
1634         cifs_sb = CIFS_SB(inode->i_sb);
1635         tlink = cifs_sb_tlink(cifs_sb);
1636         if (IS_ERR(tlink)) {
1637                 rc = PTR_ERR(tlink);
1638                 goto rmdir_exit;
1639         }
1640         tcon = tlink_tcon(tlink);
1641         server = tcon->ses->server;
1642
1643         if (!server->ops->rmdir) {
1644                 rc = -ENOSYS;
1645                 cifs_put_tlink(tlink);
1646                 goto rmdir_exit;
1647         }
1648
1649         rc = server->ops->rmdir(xid, tcon, full_path, cifs_sb);
1650         cifs_put_tlink(tlink);
1651
1652         if (!rc) {
1653                 spin_lock(&d_inode(direntry)->i_lock);
1654                 i_size_write(d_inode(direntry), 0);
1655                 clear_nlink(d_inode(direntry));
1656                 spin_unlock(&d_inode(direntry)->i_lock);
1657         }
1658
1659         cifsInode = CIFS_I(d_inode(direntry));
1660         /* force revalidate to go get info when needed */
1661         cifsInode->time = 0;
1662
1663         cifsInode = CIFS_I(inode);
1664         /*
1665          * Force revalidate to get parent dir info when needed since cached
1666          * attributes are invalid now.
1667          */
1668         cifsInode->time = 0;
1669
1670         d_inode(direntry)->i_ctime = inode->i_ctime = inode->i_mtime =
1671                 current_time(inode);
1672
1673 rmdir_exit:
1674         kfree(full_path);
1675         free_xid(xid);
1676         return rc;
1677 }
1678
1679 static int
1680 cifs_do_rename(const unsigned int xid, struct dentry *from_dentry,
1681                const char *from_path, struct dentry *to_dentry,
1682                const char *to_path)
1683 {
1684         struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1685         struct tcon_link *tlink;
1686         struct cifs_tcon *tcon;
1687         struct TCP_Server_Info *server;
1688         struct cifs_fid fid;
1689         struct cifs_open_parms oparms;
1690         int oplock, rc;
1691
1692         tlink = cifs_sb_tlink(cifs_sb);
1693         if (IS_ERR(tlink))
1694                 return PTR_ERR(tlink);
1695         tcon = tlink_tcon(tlink);
1696         server = tcon->ses->server;
1697
1698         if (!server->ops->rename)
1699                 return -ENOSYS;
1700
1701         /* try path-based rename first */
1702         rc = server->ops->rename(xid, tcon, from_path, to_path, cifs_sb);
1703
1704         /*
1705          * Don't bother with rename by filehandle unless file is busy and
1706          * source. Note that cross directory moves do not work with
1707          * rename by filehandle to various Windows servers.
1708          */
1709         if (rc == 0 || rc != -EBUSY)
1710                 goto do_rename_exit;
1711
1712         /* open-file renames don't work across directories */
1713         if (to_dentry->d_parent != from_dentry->d_parent)
1714                 goto do_rename_exit;
1715
1716         oparms.tcon = tcon;
1717         oparms.cifs_sb = cifs_sb;
1718         /* open the file to be renamed -- we need DELETE perms */
1719         oparms.desired_access = DELETE;
1720         oparms.create_options = CREATE_NOT_DIR;
1721         oparms.disposition = FILE_OPEN;
1722         oparms.path = from_path;
1723         oparms.fid = &fid;
1724         oparms.reconnect = false;
1725
1726         rc = CIFS_open(xid, &oparms, &oplock, NULL);
1727         if (rc == 0) {
1728                 rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid,
1729                                 (const char *) to_dentry->d_name.name,
1730                                 cifs_sb->local_nls, cifs_remap(cifs_sb));
1731                 CIFSSMBClose(xid, tcon, fid.netfid);
1732         }
1733 do_rename_exit:
1734         cifs_put_tlink(tlink);
1735         return rc;
1736 }
1737
1738 int
1739 cifs_rename2(struct inode *source_dir, struct dentry *source_dentry,
1740              struct inode *target_dir, struct dentry *target_dentry,
1741              unsigned int flags)
1742 {
1743         char *from_name = NULL;
1744         char *to_name = NULL;
1745         struct cifs_sb_info *cifs_sb;
1746         struct tcon_link *tlink;
1747         struct cifs_tcon *tcon;
1748         FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1749         FILE_UNIX_BASIC_INFO *info_buf_target;
1750         unsigned int xid;
1751         int rc, tmprc;
1752
1753         if (flags & ~RENAME_NOREPLACE)
1754                 return -EINVAL;
1755
1756         cifs_sb = CIFS_SB(source_dir->i_sb);
1757         tlink = cifs_sb_tlink(cifs_sb);
1758         if (IS_ERR(tlink))
1759                 return PTR_ERR(tlink);
1760         tcon = tlink_tcon(tlink);
1761
1762         xid = get_xid();
1763
1764         /*
1765          * we already have the rename sem so we do not need to
1766          * grab it again here to protect the path integrity
1767          */
1768         from_name = build_path_from_dentry(source_dentry);
1769         if (from_name == NULL) {
1770                 rc = -ENOMEM;
1771                 goto cifs_rename_exit;
1772         }
1773
1774         to_name = build_path_from_dentry(target_dentry);
1775         if (to_name == NULL) {
1776                 rc = -ENOMEM;
1777                 goto cifs_rename_exit;
1778         }
1779
1780         rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
1781                             to_name);
1782
1783         /*
1784          * No-replace is the natural behavior for CIFS, so skip unlink hacks.
1785          */
1786         if (flags & RENAME_NOREPLACE)
1787                 goto cifs_rename_exit;
1788
1789         if (rc == -EEXIST && tcon->unix_ext) {
1790                 /*
1791                  * Are src and dst hardlinks of same inode? We can only tell
1792                  * with unix extensions enabled.
1793                  */
1794                 info_buf_source =
1795                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1796                                         GFP_KERNEL);
1797                 if (info_buf_source == NULL) {
1798                         rc = -ENOMEM;
1799                         goto cifs_rename_exit;
1800                 }
1801
1802                 info_buf_target = info_buf_source + 1;
1803                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, from_name,
1804                                              info_buf_source,
1805                                              cifs_sb->local_nls,
1806                                              cifs_remap(cifs_sb));
1807                 if (tmprc != 0)
1808                         goto unlink_target;
1809
1810                 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, to_name,
1811                                              info_buf_target,
1812                                              cifs_sb->local_nls,
1813                                              cifs_remap(cifs_sb));
1814
1815                 if (tmprc == 0 && (info_buf_source->UniqueId ==
1816                                    info_buf_target->UniqueId)) {
1817                         /* same file, POSIX says that this is a noop */
1818                         rc = 0;
1819                         goto cifs_rename_exit;
1820                 }
1821         }
1822         /*
1823          * else ... BB we could add the same check for Windows by
1824          * checking the UniqueId via FILE_INTERNAL_INFO
1825          */
1826
1827 unlink_target:
1828         /* Try unlinking the target dentry if it's not negative */
1829         if (d_really_is_positive(target_dentry) && (rc == -EACCES || rc == -EEXIST)) {
1830                 if (d_is_dir(target_dentry))
1831                         tmprc = cifs_rmdir(target_dir, target_dentry);
1832                 else
1833                         tmprc = cifs_unlink(target_dir, target_dentry);
1834                 if (tmprc)
1835                         goto cifs_rename_exit;
1836                 rc = cifs_do_rename(xid, source_dentry, from_name,
1837                                     target_dentry, to_name);
1838         }
1839
1840         /* force revalidate to go get info when needed */
1841         CIFS_I(source_dir)->time = CIFS_I(target_dir)->time = 0;
1842
1843         source_dir->i_ctime = source_dir->i_mtime = target_dir->i_ctime =
1844                 target_dir->i_mtime = current_time(source_dir);
1845
1846 cifs_rename_exit:
1847         kfree(info_buf_source);
1848         kfree(from_name);
1849         kfree(to_name);
1850         free_xid(xid);
1851         cifs_put_tlink(tlink);
1852         return rc;
1853 }
1854
1855 static bool
1856 cifs_inode_needs_reval(struct inode *inode)
1857 {
1858         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1859         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1860
1861         if (cifs_i->time == 0)
1862                 return true;
1863
1864         if (CIFS_CACHE_READ(cifs_i))
1865                 return false;
1866
1867         if (!lookupCacheEnabled)
1868                 return true;
1869
1870         if (!cifs_sb->actimeo)
1871                 return true;
1872
1873         if (!time_in_range(jiffies, cifs_i->time,
1874                                 cifs_i->time + cifs_sb->actimeo))
1875                 return true;
1876
1877         /* hardlinked files w/ noserverino get "special" treatment */
1878         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
1879             S_ISREG(inode->i_mode) && inode->i_nlink != 1)
1880                 return true;
1881
1882         return false;
1883 }
1884
1885 /*
1886  * Zap the cache. Called when invalid_mapping flag is set.
1887  */
1888 int
1889 cifs_invalidate_mapping(struct inode *inode)
1890 {
1891         int rc = 0;
1892
1893         if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
1894                 rc = invalidate_inode_pages2(inode->i_mapping);
1895                 if (rc)
1896                         cifs_dbg(VFS, "%s: could not invalidate inode %p\n",
1897                                  __func__, inode);
1898         }
1899
1900         cifs_fscache_reset_inode_cookie(inode);
1901         return rc;
1902 }
1903
1904 /**
1905  * cifs_wait_bit_killable - helper for functions that are sleeping on bit locks
1906  * @word: long word containing the bit lock
1907  */
1908 static int
1909 cifs_wait_bit_killable(struct wait_bit_key *key, int mode)
1910 {
1911         freezable_schedule_unsafe();
1912         if (signal_pending_state(mode, current))
1913                 return -ERESTARTSYS;
1914         return 0;
1915 }
1916
1917 int
1918 cifs_revalidate_mapping(struct inode *inode)
1919 {
1920         int rc;
1921         unsigned long *flags = &CIFS_I(inode)->flags;
1922
1923         rc = wait_on_bit_lock_action(flags, CIFS_INO_LOCK, cifs_wait_bit_killable,
1924                                      TASK_KILLABLE);
1925         if (rc)
1926                 return rc;
1927
1928         if (test_and_clear_bit(CIFS_INO_INVALID_MAPPING, flags)) {
1929                 rc = cifs_invalidate_mapping(inode);
1930                 if (rc)
1931                         set_bit(CIFS_INO_INVALID_MAPPING, flags);
1932         }
1933
1934         clear_bit_unlock(CIFS_INO_LOCK, flags);
1935         smp_mb__after_atomic();
1936         wake_up_bit(flags, CIFS_INO_LOCK);
1937
1938         return rc;
1939 }
1940
1941 int
1942 cifs_zap_mapping(struct inode *inode)
1943 {
1944         set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(inode)->flags);
1945         return cifs_revalidate_mapping(inode);
1946 }
1947
1948 int cifs_revalidate_file_attr(struct file *filp)
1949 {
1950         int rc = 0;
1951         struct inode *inode = file_inode(filp);
1952         struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
1953
1954         if (!cifs_inode_needs_reval(inode))
1955                 return rc;
1956
1957         if (tlink_tcon(cfile->tlink)->unix_ext)
1958                 rc = cifs_get_file_info_unix(filp);
1959         else
1960                 rc = cifs_get_file_info(filp);
1961
1962         return rc;
1963 }
1964
1965 int cifs_revalidate_dentry_attr(struct dentry *dentry)
1966 {
1967         unsigned int xid;
1968         int rc = 0;
1969         struct inode *inode = d_inode(dentry);
1970         struct super_block *sb = dentry->d_sb;
1971         char *full_path = NULL;
1972
1973         if (inode == NULL)
1974                 return -ENOENT;
1975
1976         if (!cifs_inode_needs_reval(inode))
1977                 return rc;
1978
1979         xid = get_xid();
1980
1981         /* can not safely grab the rename sem here if rename calls revalidate
1982            since that would deadlock */
1983         full_path = build_path_from_dentry(dentry);
1984         if (full_path == NULL) {
1985                 rc = -ENOMEM;
1986                 goto out;
1987         }
1988
1989         cifs_dbg(FYI, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time %ld jiffies %ld\n",
1990                  full_path, inode, inode->i_count.counter,
1991                  dentry, cifs_get_time(dentry), jiffies);
1992
1993         if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
1994                 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
1995         else
1996                 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
1997                                          xid, NULL);
1998
1999 out:
2000         kfree(full_path);
2001         free_xid(xid);
2002         return rc;
2003 }
2004
2005 int cifs_revalidate_file(struct file *filp)
2006 {
2007         int rc;
2008         struct inode *inode = file_inode(filp);
2009
2010         rc = cifs_revalidate_file_attr(filp);
2011         if (rc)
2012                 return rc;
2013
2014         return cifs_revalidate_mapping(inode);
2015 }
2016
2017 /* revalidate a dentry's inode attributes */
2018 int cifs_revalidate_dentry(struct dentry *dentry)
2019 {
2020         int rc;
2021         struct inode *inode = d_inode(dentry);
2022
2023         rc = cifs_revalidate_dentry_attr(dentry);
2024         if (rc)
2025                 return rc;
2026
2027         return cifs_revalidate_mapping(inode);
2028 }
2029
2030 int cifs_getattr(const struct path *path, struct kstat *stat,
2031                  u32 request_mask, unsigned int flags)
2032 {
2033         struct dentry *dentry = path->dentry;
2034         struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
2035         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
2036         struct inode *inode = d_inode(dentry);
2037         int rc;
2038
2039         /*
2040          * We need to be sure that all dirty pages are written and the server
2041          * has actual ctime, mtime and file length.
2042          */
2043         if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
2044             inode->i_mapping->nrpages != 0) {
2045                 rc = filemap_fdatawait(inode->i_mapping);
2046                 if (rc) {
2047                         mapping_set_error(inode->i_mapping, rc);
2048                         return rc;
2049                 }
2050         }
2051
2052         rc = cifs_revalidate_dentry_attr(dentry);
2053         if (rc)
2054                 return rc;
2055
2056         generic_fillattr(inode, stat);
2057         stat->blksize = CIFS_MAX_MSGSIZE;
2058         stat->ino = CIFS_I(inode)->uniqueid;
2059
2060         /* old CIFS Unix Extensions doesn't return create time */
2061         if (CIFS_I(inode)->createtime) {
2062                 stat->result_mask |= STATX_BTIME;
2063                 stat->btime =
2064                       cifs_NTtimeToUnix(cpu_to_le64(CIFS_I(inode)->createtime));
2065         }
2066
2067         stat->attributes_mask |= (STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED);
2068         if (CIFS_I(inode)->cifsAttrs & FILE_ATTRIBUTE_COMPRESSED)
2069                 stat->attributes |= STATX_ATTR_COMPRESSED;
2070         if (CIFS_I(inode)->cifsAttrs & FILE_ATTRIBUTE_ENCRYPTED)
2071                 stat->attributes |= STATX_ATTR_ENCRYPTED;
2072
2073         /*
2074          * If on a multiuser mount without unix extensions or cifsacl being
2075          * enabled, and the admin hasn't overridden them, set the ownership
2076          * to the fsuid/fsgid of the current process.
2077          */
2078         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
2079             !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
2080             !tcon->unix_ext) {
2081                 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
2082                         stat->uid = current_fsuid();
2083                 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
2084                         stat->gid = current_fsgid();
2085         }
2086         return rc;
2087 }
2088
2089 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
2090 {
2091         pgoff_t index = from >> PAGE_SHIFT;
2092         unsigned offset = from & (PAGE_SIZE - 1);
2093         struct page *page;
2094         int rc = 0;
2095
2096         page = grab_cache_page(mapping, index);
2097         if (!page)
2098                 return -ENOMEM;
2099
2100         zero_user_segment(page, offset, PAGE_SIZE);
2101         unlock_page(page);
2102         put_page(page);
2103         return rc;
2104 }
2105
2106 static void cifs_setsize(struct inode *inode, loff_t offset)
2107 {
2108         struct cifsInodeInfo *cifs_i = CIFS_I(inode);
2109
2110         spin_lock(&inode->i_lock);
2111         i_size_write(inode, offset);
2112         spin_unlock(&inode->i_lock);
2113
2114         /* Cached inode must be refreshed on truncate */
2115         cifs_i->time = 0;
2116         truncate_pagecache(inode, offset);
2117 }
2118
2119 static int
2120 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
2121                    unsigned int xid, char *full_path)
2122 {
2123         int rc;
2124         struct cifsFileInfo *open_file;
2125         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2126         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2127         struct tcon_link *tlink = NULL;
2128         struct cifs_tcon *tcon = NULL;
2129         struct TCP_Server_Info *server;
2130
2131         /*
2132          * To avoid spurious oplock breaks from server, in the case of
2133          * inodes that we already have open, avoid doing path based
2134          * setting of file size if we can do it by handle.
2135          * This keeps our caching token (oplock) and avoids timeouts
2136          * when the local oplock break takes longer to flush
2137          * writebehind data than the SMB timeout for the SetPathInfo
2138          * request would allow
2139          */
2140         open_file = find_writable_file(cifsInode, true);
2141         if (open_file) {
2142                 tcon = tlink_tcon(open_file->tlink);
2143                 server = tcon->ses->server;
2144                 if (server->ops->set_file_size)
2145                         rc = server->ops->set_file_size(xid, tcon, open_file,
2146                                                         attrs->ia_size, false);
2147                 else
2148                         rc = -ENOSYS;
2149                 cifsFileInfo_put(open_file);
2150                 cifs_dbg(FYI, "SetFSize for attrs rc = %d\n", rc);
2151         } else
2152                 rc = -EINVAL;
2153
2154         if (!rc)
2155                 goto set_size_out;
2156
2157         if (tcon == NULL) {
2158                 tlink = cifs_sb_tlink(cifs_sb);
2159                 if (IS_ERR(tlink))
2160                         return PTR_ERR(tlink);
2161                 tcon = tlink_tcon(tlink);
2162                 server = tcon->ses->server;
2163         }
2164
2165         /*
2166          * Set file size by pathname rather than by handle either because no
2167          * valid, writeable file handle for it was found or because there was
2168          * an error setting it by handle.
2169          */
2170         if (server->ops->set_path_size)
2171                 rc = server->ops->set_path_size(xid, tcon, full_path,
2172                                                 attrs->ia_size, cifs_sb, false);
2173         else
2174                 rc = -ENOSYS;
2175         cifs_dbg(FYI, "SetEOF by path (setattrs) rc = %d\n", rc);
2176
2177         if (tlink)
2178                 cifs_put_tlink(tlink);
2179
2180 set_size_out:
2181         if (rc == 0) {
2182                 cifsInode->server_eof = attrs->ia_size;
2183                 cifs_setsize(inode, attrs->ia_size);
2184                 cifs_truncate_page(inode->i_mapping, inode->i_size);
2185         }
2186
2187         return rc;
2188 }
2189
2190 static int
2191 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
2192 {
2193         int rc;
2194         unsigned int xid;
2195         char *full_path = NULL;
2196         struct inode *inode = d_inode(direntry);
2197         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2198         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2199         struct tcon_link *tlink;
2200         struct cifs_tcon *pTcon;
2201         struct cifs_unix_set_info_args *args = NULL;
2202         struct cifsFileInfo *open_file;
2203
2204         cifs_dbg(FYI, "setattr_unix on file %pd attrs->ia_valid=0x%x\n",
2205                  direntry, attrs->ia_valid);
2206
2207         xid = get_xid();
2208
2209         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2210                 attrs->ia_valid |= ATTR_FORCE;
2211
2212         rc = setattr_prepare(direntry, attrs);
2213         if (rc < 0)
2214                 goto out;
2215
2216         full_path = build_path_from_dentry(direntry);
2217         if (full_path == NULL) {
2218                 rc = -ENOMEM;
2219                 goto out;
2220         }
2221
2222         /*
2223          * Attempt to flush data before changing attributes. We need to do
2224          * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2225          * ownership or mode then we may also need to do this. Here, we take
2226          * the safe way out and just do the flush on all setattr requests. If
2227          * the flush returns error, store it to report later and continue.
2228          *
2229          * BB: This should be smarter. Why bother flushing pages that
2230          * will be truncated anyway? Also, should we error out here if
2231          * the flush returns error?
2232          */
2233         rc = filemap_write_and_wait(inode->i_mapping);
2234         mapping_set_error(inode->i_mapping, rc);
2235         rc = 0;
2236
2237         if (attrs->ia_valid & ATTR_SIZE) {
2238                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2239                 if (rc != 0)
2240                         goto out;
2241         }
2242
2243         /* skip mode change if it's just for clearing setuid/setgid */
2244         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2245                 attrs->ia_valid &= ~ATTR_MODE;
2246
2247         args = kmalloc(sizeof(*args), GFP_KERNEL);
2248         if (args == NULL) {
2249                 rc = -ENOMEM;
2250                 goto out;
2251         }
2252
2253         /* set up the struct */
2254         if (attrs->ia_valid & ATTR_MODE)
2255                 args->mode = attrs->ia_mode;
2256         else
2257                 args->mode = NO_CHANGE_64;
2258
2259         if (attrs->ia_valid & ATTR_UID)
2260                 args->uid = attrs->ia_uid;
2261         else
2262                 args->uid = INVALID_UID; /* no change */
2263
2264         if (attrs->ia_valid & ATTR_GID)
2265                 args->gid = attrs->ia_gid;
2266         else
2267                 args->gid = INVALID_GID; /* no change */
2268
2269         if (attrs->ia_valid & ATTR_ATIME)
2270                 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
2271         else
2272                 args->atime = NO_CHANGE_64;
2273
2274         if (attrs->ia_valid & ATTR_MTIME)
2275                 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
2276         else
2277                 args->mtime = NO_CHANGE_64;
2278
2279         if (attrs->ia_valid & ATTR_CTIME)
2280                 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
2281         else
2282                 args->ctime = NO_CHANGE_64;
2283
2284         args->device = 0;
2285         open_file = find_writable_file(cifsInode, true);
2286         if (open_file) {
2287                 u16 nfid = open_file->fid.netfid;
2288                 u32 npid = open_file->pid;
2289                 pTcon = tlink_tcon(open_file->tlink);
2290                 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
2291                 cifsFileInfo_put(open_file);
2292         } else {
2293                 tlink = cifs_sb_tlink(cifs_sb);
2294                 if (IS_ERR(tlink)) {
2295                         rc = PTR_ERR(tlink);
2296                         goto out;
2297                 }
2298                 pTcon = tlink_tcon(tlink);
2299                 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
2300                                     cifs_sb->local_nls,
2301                                     cifs_remap(cifs_sb));
2302                 cifs_put_tlink(tlink);
2303         }
2304
2305         if (rc)
2306                 goto out;
2307
2308         if ((attrs->ia_valid & ATTR_SIZE) &&
2309             attrs->ia_size != i_size_read(inode))
2310                 truncate_setsize(inode, attrs->ia_size);
2311
2312         setattr_copy(inode, attrs);
2313         mark_inode_dirty(inode);
2314
2315         /* force revalidate when any of these times are set since some
2316            of the fs types (eg ext3, fat) do not have fine enough
2317            time granularity to match protocol, and we do not have a
2318            a way (yet) to query the server fs's time granularity (and
2319            whether it rounds times down).
2320         */
2321         if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
2322                 cifsInode->time = 0;
2323 out:
2324         kfree(args);
2325         kfree(full_path);
2326         free_xid(xid);
2327         return rc;
2328 }
2329
2330 static int
2331 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
2332 {
2333         unsigned int xid;
2334         kuid_t uid = INVALID_UID;
2335         kgid_t gid = INVALID_GID;
2336         struct inode *inode = d_inode(direntry);
2337         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2338         struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2339         char *full_path = NULL;
2340         int rc = -EACCES;
2341         __u32 dosattr = 0;
2342         __u64 mode = NO_CHANGE_64;
2343
2344         xid = get_xid();
2345
2346         cifs_dbg(FYI, "setattr on file %pd attrs->iavalid 0x%x\n",
2347                  direntry, attrs->ia_valid);
2348
2349         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2350                 attrs->ia_valid |= ATTR_FORCE;
2351
2352         rc = setattr_prepare(direntry, attrs);
2353         if (rc < 0) {
2354                 free_xid(xid);
2355                 return rc;
2356         }
2357
2358         full_path = build_path_from_dentry(direntry);
2359         if (full_path == NULL) {
2360                 rc = -ENOMEM;
2361                 free_xid(xid);
2362                 return rc;
2363         }
2364
2365         /*
2366          * Attempt to flush data before changing attributes. We need to do
2367          * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2368          * ownership or mode then we may also need to do this. Here, we take
2369          * the safe way out and just do the flush on all setattr requests. If
2370          * the flush returns error, store it to report later and continue.
2371          *
2372          * BB: This should be smarter. Why bother flushing pages that
2373          * will be truncated anyway? Also, should we error out here if
2374          * the flush returns error?
2375          */
2376         rc = filemap_write_and_wait(inode->i_mapping);
2377         mapping_set_error(inode->i_mapping, rc);
2378         rc = 0;
2379
2380         if (attrs->ia_valid & ATTR_SIZE) {
2381                 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2382                 if (rc != 0)
2383                         goto cifs_setattr_exit;
2384         }
2385
2386         if (attrs->ia_valid & ATTR_UID)
2387                 uid = attrs->ia_uid;
2388
2389         if (attrs->ia_valid & ATTR_GID)
2390                 gid = attrs->ia_gid;
2391
2392 #ifdef CONFIG_CIFS_ACL
2393         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2394                 if (uid_valid(uid) || gid_valid(gid)) {
2395                         rc = id_mode_to_cifs_acl(inode, full_path, NO_CHANGE_64,
2396                                                         uid, gid);
2397                         if (rc) {
2398                                 cifs_dbg(FYI, "%s: Setting id failed with error: %d\n",
2399                                          __func__, rc);
2400                                 goto cifs_setattr_exit;
2401                         }
2402                 }
2403         } else
2404 #endif /* CONFIG_CIFS_ACL */
2405         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
2406                 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
2407
2408         /* skip mode change if it's just for clearing setuid/setgid */
2409         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2410                 attrs->ia_valid &= ~ATTR_MODE;
2411
2412         if (attrs->ia_valid & ATTR_MODE) {
2413                 mode = attrs->ia_mode;
2414                 rc = 0;
2415 #ifdef CONFIG_CIFS_ACL
2416                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2417                         rc = id_mode_to_cifs_acl(inode, full_path, mode,
2418                                                 INVALID_UID, INVALID_GID);
2419                         if (rc) {
2420                                 cifs_dbg(FYI, "%s: Setting ACL failed with error: %d\n",
2421                                          __func__, rc);
2422                                 goto cifs_setattr_exit;
2423                         }
2424                 } else
2425 #endif /* CONFIG_CIFS_ACL */
2426                 if (((mode & S_IWUGO) == 0) &&
2427                     (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
2428
2429                         dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
2430
2431                         /* fix up mode if we're not using dynperm */
2432                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
2433                                 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
2434                 } else if ((mode & S_IWUGO) &&
2435                            (cifsInode->cifsAttrs & ATTR_READONLY)) {
2436
2437                         dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
2438                         /* Attributes of 0 are ignored */
2439                         if (dosattr == 0)
2440                                 dosattr |= ATTR_NORMAL;
2441
2442                         /* reset local inode permissions to normal */
2443                         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2444                                 attrs->ia_mode &= ~(S_IALLUGO);
2445                                 if (S_ISDIR(inode->i_mode))
2446                                         attrs->ia_mode |=
2447                                                 cifs_sb->mnt_dir_mode;
2448                                 else
2449                                         attrs->ia_mode |=
2450                                                 cifs_sb->mnt_file_mode;
2451                         }
2452                 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2453                         /* ignore mode change - ATTR_READONLY hasn't changed */
2454                         attrs->ia_valid &= ~ATTR_MODE;
2455                 }
2456         }
2457
2458         if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
2459             ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
2460                 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
2461                 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
2462
2463                 /* Even if error on time set, no sense failing the call if
2464                 the server would set the time to a reasonable value anyway,
2465                 and this check ensures that we are not being called from
2466                 sys_utimes in which case we ought to fail the call back to
2467                 the user when the server rejects the call */
2468                 if ((rc) && (attrs->ia_valid &
2469                                 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
2470                         rc = 0;
2471         }
2472
2473         /* do not need local check to inode_check_ok since the server does
2474            that */
2475         if (rc)
2476                 goto cifs_setattr_exit;
2477
2478         if ((attrs->ia_valid & ATTR_SIZE) &&
2479             attrs->ia_size != i_size_read(inode))
2480                 truncate_setsize(inode, attrs->ia_size);
2481
2482         setattr_copy(inode, attrs);
2483         mark_inode_dirty(inode);
2484
2485 cifs_setattr_exit:
2486         kfree(full_path);
2487         free_xid(xid);
2488         return rc;
2489 }
2490
2491 int
2492 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
2493 {
2494         struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
2495         struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
2496
2497         if (pTcon->unix_ext)
2498                 return cifs_setattr_unix(direntry, attrs);
2499
2500         return cifs_setattr_nounix(direntry, attrs);
2501
2502         /* BB: add cifs_setattr_legacy for really old servers */
2503 }
2504
2505 #if 0
2506 void cifs_delete_inode(struct inode *inode)
2507 {
2508         cifs_dbg(FYI, "In cifs_delete_inode, inode = 0x%p\n", inode);
2509         /* may have to add back in if and when safe distributed caching of
2510            directories added e.g. via FindNotify */
2511 }
2512 #endif