Loading...
1// SPDX-License-Identifier: LGPL-2.1
2/*
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2010
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 */
8#include <linux/fs.h>
9#include <linux/stat.h>
10#include <linux/slab.h>
11#include <linux/pagemap.h>
12#include <linux/freezer.h>
13#include <linux/sched/signal.h>
14#include <linux/wait_bit.h>
15#include <linux/fiemap.h>
16#include <asm/div64.h>
17#include "cifsfs.h"
18#include "cifspdu.h"
19#include "cifsglob.h"
20#include "cifsproto.h"
21#include "smb2proto.h"
22#include "cifs_debug.h"
23#include "cifs_fs_sb.h"
24#include "cifs_unicode.h"
25#include "fscache.h"
26#include "fs_context.h"
27#include "cifs_ioctl.h"
28#include "cached_dir.h"
29
30static void cifs_set_ops(struct inode *inode)
31{
32 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
33
34 switch (inode->i_mode & S_IFMT) {
35 case S_IFREG:
36 inode->i_op = &cifs_file_inode_ops;
37 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
38 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
39 inode->i_fop = &cifs_file_direct_nobrl_ops;
40 else
41 inode->i_fop = &cifs_file_direct_ops;
42 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
43 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
44 inode->i_fop = &cifs_file_strict_nobrl_ops;
45 else
46 inode->i_fop = &cifs_file_strict_ops;
47 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
48 inode->i_fop = &cifs_file_nobrl_ops;
49 else { /* not direct, send byte range locks */
50 inode->i_fop = &cifs_file_ops;
51 }
52
53 /* check if server can support readahead */
54 if (cifs_sb_master_tcon(cifs_sb)->ses->server->max_read <
55 PAGE_SIZE + MAX_CIFS_HDR_SIZE)
56 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
57 else
58 inode->i_data.a_ops = &cifs_addr_ops;
59 break;
60 case S_IFDIR:
61#ifdef CONFIG_CIFS_DFS_UPCALL
62 if (IS_AUTOMOUNT(inode)) {
63 inode->i_op = &cifs_dfs_referral_inode_operations;
64 } else {
65#else /* NO DFS support, treat as a directory */
66 {
67#endif
68 inode->i_op = &cifs_dir_inode_ops;
69 inode->i_fop = &cifs_dir_ops;
70 }
71 break;
72 case S_IFLNK:
73 inode->i_op = &cifs_symlink_inode_ops;
74 break;
75 default:
76 init_special_inode(inode, inode->i_mode, inode->i_rdev);
77 break;
78 }
79}
80
81/* check inode attributes against fattr. If they don't match, tag the
82 * inode for cache invalidation
83 */
84static void
85cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
86{
87 struct cifs_fscache_inode_coherency_data cd;
88 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
89
90 cifs_dbg(FYI, "%s: revalidating inode %llu\n",
91 __func__, cifs_i->uniqueid);
92
93 if (inode->i_state & I_NEW) {
94 cifs_dbg(FYI, "%s: inode %llu is new\n",
95 __func__, cifs_i->uniqueid);
96 return;
97 }
98
99 /* don't bother with revalidation if we have an oplock */
100 if (CIFS_CACHE_READ(cifs_i)) {
101 cifs_dbg(FYI, "%s: inode %llu is oplocked\n",
102 __func__, cifs_i->uniqueid);
103 return;
104 }
105
106 /* revalidate if mtime or size have changed */
107 fattr->cf_mtime = timestamp_truncate(fattr->cf_mtime, inode);
108 if (timespec64_equal(&inode->i_mtime, &fattr->cf_mtime) &&
109 cifs_i->server_eof == fattr->cf_eof) {
110 cifs_dbg(FYI, "%s: inode %llu is unchanged\n",
111 __func__, cifs_i->uniqueid);
112 return;
113 }
114
115 cifs_dbg(FYI, "%s: invalidating inode %llu mapping\n",
116 __func__, cifs_i->uniqueid);
117 set_bit(CIFS_INO_INVALID_MAPPING, &cifs_i->flags);
118 /* Invalidate fscache cookie */
119 cifs_fscache_fill_coherency(&cifs_i->netfs.inode, &cd);
120 fscache_invalidate(cifs_inode_cookie(inode), &cd, i_size_read(inode), 0);
121}
122
123/*
124 * copy nlink to the inode, unless it wasn't provided. Provide
125 * sane values if we don't have an existing one and none was provided
126 */
127static void
128cifs_nlink_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
129{
130 /*
131 * if we're in a situation where we can't trust what we
132 * got from the server (readdir, some non-unix cases)
133 * fake reasonable values
134 */
135 if (fattr->cf_flags & CIFS_FATTR_UNKNOWN_NLINK) {
136 /* only provide fake values on a new inode */
137 if (inode->i_state & I_NEW) {
138 if (fattr->cf_cifsattrs & ATTR_DIRECTORY)
139 set_nlink(inode, 2);
140 else
141 set_nlink(inode, 1);
142 }
143 return;
144 }
145
146 /* we trust the server, so update it */
147 set_nlink(inode, fattr->cf_nlink);
148}
149
150/* populate an inode with info from a cifs_fattr struct */
151int
152cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
153{
154 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
155 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
156
157 if (!(inode->i_state & I_NEW) &&
158 unlikely(inode_wrong_type(inode, fattr->cf_mode))) {
159 CIFS_I(inode)->time = 0; /* force reval */
160 return -ESTALE;
161 }
162
163 cifs_revalidate_cache(inode, fattr);
164
165 spin_lock(&inode->i_lock);
166 fattr->cf_mtime = timestamp_truncate(fattr->cf_mtime, inode);
167 fattr->cf_atime = timestamp_truncate(fattr->cf_atime, inode);
168 fattr->cf_ctime = timestamp_truncate(fattr->cf_ctime, inode);
169 /* we do not want atime to be less than mtime, it broke some apps */
170 if (timespec64_compare(&fattr->cf_atime, &fattr->cf_mtime) < 0)
171 inode->i_atime = fattr->cf_mtime;
172 else
173 inode->i_atime = fattr->cf_atime;
174 inode->i_mtime = fattr->cf_mtime;
175 inode->i_ctime = fattr->cf_ctime;
176 inode->i_rdev = fattr->cf_rdev;
177 cifs_nlink_fattr_to_inode(inode, fattr);
178 inode->i_uid = fattr->cf_uid;
179 inode->i_gid = fattr->cf_gid;
180
181 /* if dynperm is set, don't clobber existing mode */
182 if (inode->i_state & I_NEW ||
183 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM))
184 inode->i_mode = fattr->cf_mode;
185
186 cifs_i->cifsAttrs = fattr->cf_cifsattrs;
187
188 if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
189 cifs_i->time = 0;
190 else
191 cifs_i->time = jiffies;
192
193 if (fattr->cf_flags & CIFS_FATTR_DELETE_PENDING)
194 set_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags);
195 else
196 clear_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags);
197
198 cifs_i->server_eof = fattr->cf_eof;
199 /*
200 * Can't safely change the file size here if the client is writing to
201 * it due to potential races.
202 */
203 if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) {
204 i_size_write(inode, fattr->cf_eof);
205
206 /*
207 * i_blocks is not related to (i_size / i_blksize),
208 * but instead 512 byte (2**9) size is required for
209 * calculating num blocks.
210 */
211 inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
212 }
213
214 if (S_ISLNK(fattr->cf_mode)) {
215 kfree(cifs_i->symlink_target);
216 cifs_i->symlink_target = fattr->cf_symlink_target;
217 fattr->cf_symlink_target = NULL;
218 }
219 spin_unlock(&inode->i_lock);
220
221 if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL)
222 inode->i_flags |= S_AUTOMOUNT;
223 if (inode->i_state & I_NEW)
224 cifs_set_ops(inode);
225 return 0;
226}
227
228void
229cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
230{
231 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
232
233 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
234 return;
235
236 fattr->cf_uniqueid = iunique(sb, ROOT_I);
237}
238
239/* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
240void
241cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
242 struct cifs_sb_info *cifs_sb)
243{
244 memset(fattr, 0, sizeof(*fattr));
245 fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
246 fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
247 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
248
249 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
250 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime);
251 fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange);
252 /* old POSIX extensions don't get create time */
253
254 fattr->cf_mode = le64_to_cpu(info->Permissions);
255
256 /*
257 * Since we set the inode type below we need to mask off
258 * to avoid strange results if bits set above.
259 */
260 fattr->cf_mode &= ~S_IFMT;
261 switch (le32_to_cpu(info->Type)) {
262 case UNIX_FILE:
263 fattr->cf_mode |= S_IFREG;
264 fattr->cf_dtype = DT_REG;
265 break;
266 case UNIX_SYMLINK:
267 fattr->cf_mode |= S_IFLNK;
268 fattr->cf_dtype = DT_LNK;
269 break;
270 case UNIX_DIR:
271 fattr->cf_mode |= S_IFDIR;
272 fattr->cf_dtype = DT_DIR;
273 break;
274 case UNIX_CHARDEV:
275 fattr->cf_mode |= S_IFCHR;
276 fattr->cf_dtype = DT_CHR;
277 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
278 le64_to_cpu(info->DevMinor) & MINORMASK);
279 break;
280 case UNIX_BLOCKDEV:
281 fattr->cf_mode |= S_IFBLK;
282 fattr->cf_dtype = DT_BLK;
283 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
284 le64_to_cpu(info->DevMinor) & MINORMASK);
285 break;
286 case UNIX_FIFO:
287 fattr->cf_mode |= S_IFIFO;
288 fattr->cf_dtype = DT_FIFO;
289 break;
290 case UNIX_SOCKET:
291 fattr->cf_mode |= S_IFSOCK;
292 fattr->cf_dtype = DT_SOCK;
293 break;
294 default:
295 /* safest to call it a file if we do not know */
296 fattr->cf_mode |= S_IFREG;
297 fattr->cf_dtype = DT_REG;
298 cifs_dbg(FYI, "unknown type %d\n", le32_to_cpu(info->Type));
299 break;
300 }
301
302 fattr->cf_uid = cifs_sb->ctx->linux_uid;
303 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)) {
304 u64 id = le64_to_cpu(info->Uid);
305 if (id < ((uid_t)-1)) {
306 kuid_t uid = make_kuid(&init_user_ns, id);
307 if (uid_valid(uid))
308 fattr->cf_uid = uid;
309 }
310 }
311
312 fattr->cf_gid = cifs_sb->ctx->linux_gid;
313 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)) {
314 u64 id = le64_to_cpu(info->Gid);
315 if (id < ((gid_t)-1)) {
316 kgid_t gid = make_kgid(&init_user_ns, id);
317 if (gid_valid(gid))
318 fattr->cf_gid = gid;
319 }
320 }
321
322 fattr->cf_nlink = le64_to_cpu(info->Nlinks);
323}
324
325/*
326 * Fill a cifs_fattr struct with fake inode info.
327 *
328 * Needed to setup cifs_fattr data for the directory which is the
329 * junction to the new submount (ie to setup the fake directory
330 * which represents a DFS referral).
331 */
332static void
333cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
334{
335 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
336
337 cifs_dbg(FYI, "creating fake fattr for DFS referral\n");
338
339 memset(fattr, 0, sizeof(*fattr));
340 fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
341 fattr->cf_uid = cifs_sb->ctx->linux_uid;
342 fattr->cf_gid = cifs_sb->ctx->linux_gid;
343 ktime_get_coarse_real_ts64(&fattr->cf_mtime);
344 fattr->cf_atime = fattr->cf_ctime = fattr->cf_mtime;
345 fattr->cf_nlink = 2;
346 fattr->cf_flags = CIFS_FATTR_DFS_REFERRAL;
347}
348
349#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
350static int
351cifs_get_file_info_unix(struct file *filp)
352{
353 int rc;
354 unsigned int xid;
355 FILE_UNIX_BASIC_INFO find_data;
356 struct cifs_fattr fattr = {};
357 struct inode *inode = file_inode(filp);
358 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
359 struct cifsFileInfo *cfile = filp->private_data;
360 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
361
362 xid = get_xid();
363
364 if (cfile->symlink_target) {
365 fattr.cf_symlink_target = kstrdup(cfile->symlink_target, GFP_KERNEL);
366 if (!fattr.cf_symlink_target) {
367 rc = -ENOMEM;
368 goto cifs_gfiunix_out;
369 }
370 }
371
372 rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->fid.netfid, &find_data);
373 if (!rc) {
374 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
375 } else if (rc == -EREMOTE) {
376 cifs_create_dfs_fattr(&fattr, inode->i_sb);
377 rc = 0;
378 } else
379 goto cifs_gfiunix_out;
380
381 rc = cifs_fattr_to_inode(inode, &fattr);
382
383cifs_gfiunix_out:
384 free_xid(xid);
385 return rc;
386}
387
388int cifs_get_inode_info_unix(struct inode **pinode,
389 const unsigned char *full_path,
390 struct super_block *sb, unsigned int xid)
391{
392 int rc;
393 FILE_UNIX_BASIC_INFO find_data;
394 struct cifs_fattr fattr;
395 struct cifs_tcon *tcon;
396 struct TCP_Server_Info *server;
397 struct tcon_link *tlink;
398 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
399
400 cifs_dbg(FYI, "Getting info on %s\n", full_path);
401
402 tlink = cifs_sb_tlink(cifs_sb);
403 if (IS_ERR(tlink))
404 return PTR_ERR(tlink);
405 tcon = tlink_tcon(tlink);
406 server = tcon->ses->server;
407
408 /* could have done a find first instead but this returns more info */
409 rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
410 cifs_sb->local_nls, cifs_remap(cifs_sb));
411 cifs_dbg(FYI, "%s: query path info: rc = %d\n", __func__, rc);
412 cifs_put_tlink(tlink);
413
414 if (!rc) {
415 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
416 } else if (rc == -EREMOTE) {
417 cifs_create_dfs_fattr(&fattr, sb);
418 rc = 0;
419 } else {
420 return rc;
421 }
422
423 /* check for Minshall+French symlinks */
424 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
425 int tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
426 full_path);
427 if (tmprc)
428 cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
429 }
430
431 if (S_ISLNK(fattr.cf_mode) && !fattr.cf_symlink_target) {
432 if (!server->ops->query_symlink)
433 return -EOPNOTSUPP;
434 rc = server->ops->query_symlink(xid, tcon, cifs_sb, full_path,
435 &fattr.cf_symlink_target, false);
436 if (rc) {
437 cifs_dbg(FYI, "%s: query_symlink: %d\n", __func__, rc);
438 goto cgiiu_exit;
439 }
440 }
441
442 if (*pinode == NULL) {
443 /* get new inode */
444 cifs_fill_uniqueid(sb, &fattr);
445 *pinode = cifs_iget(sb, &fattr);
446 if (!*pinode)
447 rc = -ENOMEM;
448 } else {
449 /* we already have inode, update it */
450
451 /* if uniqueid is different, return error */
452 if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
453 CIFS_I(*pinode)->uniqueid != fattr.cf_uniqueid)) {
454 CIFS_I(*pinode)->time = 0; /* force reval */
455 rc = -ESTALE;
456 goto cgiiu_exit;
457 }
458
459 /* if filetype is different, return error */
460 rc = cifs_fattr_to_inode(*pinode, &fattr);
461 }
462
463cgiiu_exit:
464 kfree(fattr.cf_symlink_target);
465 return rc;
466}
467#else
468int cifs_get_inode_info_unix(struct inode **pinode,
469 const unsigned char *full_path,
470 struct super_block *sb, unsigned int xid)
471{
472 return -EOPNOTSUPP;
473}
474#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
475
476static int
477cifs_sfu_type(struct cifs_fattr *fattr, const char *path,
478 struct cifs_sb_info *cifs_sb, unsigned int xid)
479{
480 int rc;
481 __u32 oplock;
482 struct tcon_link *tlink;
483 struct cifs_tcon *tcon;
484 struct cifs_fid fid;
485 struct cifs_open_parms oparms;
486 struct cifs_io_parms io_parms = {0};
487 char buf[24];
488 unsigned int bytes_read;
489 char *pbuf;
490 int buf_type = CIFS_NO_BUFFER;
491
492 pbuf = buf;
493
494 fattr->cf_mode &= ~S_IFMT;
495
496 if (fattr->cf_eof == 0) {
497 fattr->cf_mode |= S_IFIFO;
498 fattr->cf_dtype = DT_FIFO;
499 return 0;
500 } else if (fattr->cf_eof < 8) {
501 fattr->cf_mode |= S_IFREG;
502 fattr->cf_dtype = DT_REG;
503 return -EINVAL; /* EOPNOTSUPP? */
504 }
505
506 tlink = cifs_sb_tlink(cifs_sb);
507 if (IS_ERR(tlink))
508 return PTR_ERR(tlink);
509 tcon = tlink_tcon(tlink);
510
511 oparms.tcon = tcon;
512 oparms.cifs_sb = cifs_sb;
513 oparms.desired_access = GENERIC_READ;
514 oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
515 oparms.disposition = FILE_OPEN;
516 oparms.path = path;
517 oparms.fid = &fid;
518 oparms.reconnect = false;
519
520 if (tcon->ses->server->oplocks)
521 oplock = REQ_OPLOCK;
522 else
523 oplock = 0;
524 rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, NULL);
525 if (rc) {
526 cifs_dbg(FYI, "check sfu type of %s, open rc = %d\n", path, rc);
527 cifs_put_tlink(tlink);
528 return rc;
529 }
530
531 /* Read header */
532 io_parms.netfid = fid.netfid;
533 io_parms.pid = current->tgid;
534 io_parms.tcon = tcon;
535 io_parms.offset = 0;
536 io_parms.length = 24;
537
538 rc = tcon->ses->server->ops->sync_read(xid, &fid, &io_parms,
539 &bytes_read, &pbuf, &buf_type);
540 if ((rc == 0) && (bytes_read >= 8)) {
541 if (memcmp("IntxBLK", pbuf, 8) == 0) {
542 cifs_dbg(FYI, "Block device\n");
543 fattr->cf_mode |= S_IFBLK;
544 fattr->cf_dtype = DT_BLK;
545 if (bytes_read == 24) {
546 /* we have enough to decode dev num */
547 __u64 mjr; /* major */
548 __u64 mnr; /* minor */
549 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
550 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
551 fattr->cf_rdev = MKDEV(mjr, mnr);
552 }
553 } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
554 cifs_dbg(FYI, "Char device\n");
555 fattr->cf_mode |= S_IFCHR;
556 fattr->cf_dtype = DT_CHR;
557 if (bytes_read == 24) {
558 /* we have enough to decode dev num */
559 __u64 mjr; /* major */
560 __u64 mnr; /* minor */
561 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
562 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
563 fattr->cf_rdev = MKDEV(mjr, mnr);
564 }
565 } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
566 cifs_dbg(FYI, "Symlink\n");
567 fattr->cf_mode |= S_IFLNK;
568 fattr->cf_dtype = DT_LNK;
569 } else {
570 fattr->cf_mode |= S_IFREG; /* file? */
571 fattr->cf_dtype = DT_REG;
572 rc = -EOPNOTSUPP;
573 }
574 } else {
575 fattr->cf_mode |= S_IFREG; /* then it is a file */
576 fattr->cf_dtype = DT_REG;
577 rc = -EOPNOTSUPP; /* or some unknown SFU type */
578 }
579
580 tcon->ses->server->ops->close(xid, tcon, &fid);
581 cifs_put_tlink(tlink);
582 return rc;
583}
584
585#define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */
586
587/*
588 * Fetch mode bits as provided by SFU.
589 *
590 * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ?
591 */
592static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
593 struct cifs_sb_info *cifs_sb, unsigned int xid)
594{
595#ifdef CONFIG_CIFS_XATTR
596 ssize_t rc;
597 char ea_value[4];
598 __u32 mode;
599 struct tcon_link *tlink;
600 struct cifs_tcon *tcon;
601
602 tlink = cifs_sb_tlink(cifs_sb);
603 if (IS_ERR(tlink))
604 return PTR_ERR(tlink);
605 tcon = tlink_tcon(tlink);
606
607 if (tcon->ses->server->ops->query_all_EAs == NULL) {
608 cifs_put_tlink(tlink);
609 return -EOPNOTSUPP;
610 }
611
612 rc = tcon->ses->server->ops->query_all_EAs(xid, tcon, path,
613 "SETFILEBITS", ea_value, 4 /* size of buf */,
614 cifs_sb);
615 cifs_put_tlink(tlink);
616 if (rc < 0)
617 return (int)rc;
618 else if (rc > 3) {
619 mode = le32_to_cpu(*((__le32 *)ea_value));
620 fattr->cf_mode &= ~SFBITS_MASK;
621 cifs_dbg(FYI, "special bits 0%o org mode 0%o\n",
622 mode, fattr->cf_mode);
623 fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode;
624 cifs_dbg(FYI, "special mode bits 0%o\n", mode);
625 }
626
627 return 0;
628#else
629 return -EOPNOTSUPP;
630#endif
631}
632
633/* Fill a cifs_fattr struct with info from POSIX info struct */
634static void smb311_posix_info_to_fattr(struct cifs_fattr *fattr, struct cifs_open_info_data *data,
635 struct cifs_sid *owner,
636 struct cifs_sid *group,
637 struct super_block *sb, bool adjust_tz, bool symlink)
638{
639 struct smb311_posix_qinfo *info = &data->posix_fi;
640 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
641 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
642
643 memset(fattr, 0, sizeof(*fattr));
644
645 /* no fattr->flags to set */
646 fattr->cf_cifsattrs = le32_to_cpu(info->DosAttributes);
647 fattr->cf_uniqueid = le64_to_cpu(info->Inode);
648
649 if (info->LastAccessTime)
650 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
651 else
652 ktime_get_coarse_real_ts64(&fattr->cf_atime);
653
654 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
655 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
656
657 if (adjust_tz) {
658 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
659 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
660 }
661
662 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
663 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
664 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
665
666 fattr->cf_nlink = le32_to_cpu(info->HardLinks);
667 fattr->cf_mode = (umode_t) le32_to_cpu(info->Mode);
668 /* The srv fs device id is overridden on network mount so setting rdev isn't needed here */
669 /* fattr->cf_rdev = le32_to_cpu(info->DeviceId); */
670
671 if (symlink) {
672 fattr->cf_mode |= S_IFLNK;
673 fattr->cf_dtype = DT_LNK;
674 fattr->cf_symlink_target = data->symlink_target;
675 data->symlink_target = NULL;
676 } else if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
677 fattr->cf_mode |= S_IFDIR;
678 fattr->cf_dtype = DT_DIR;
679 } else { /* file */
680 fattr->cf_mode |= S_IFREG;
681 fattr->cf_dtype = DT_REG;
682 }
683 /* else if reparse point ... TODO: add support for FIFO and blk dev; special file types */
684
685 sid_to_id(cifs_sb, owner, fattr, SIDOWNER);
686 sid_to_id(cifs_sb, group, fattr, SIDGROUP);
687
688 cifs_dbg(FYI, "POSIX query info: mode 0x%x uniqueid 0x%llx nlink %d\n",
689 fattr->cf_mode, fattr->cf_uniqueid, fattr->cf_nlink);
690}
691
692static void cifs_open_info_to_fattr(struct cifs_fattr *fattr, struct cifs_open_info_data *data,
693 struct super_block *sb, bool adjust_tz, bool symlink,
694 u32 reparse_tag)
695{
696 struct smb2_file_all_info *info = &data->fi;
697 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
698 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
699
700 memset(fattr, 0, sizeof(*fattr));
701 fattr->cf_cifsattrs = le32_to_cpu(info->Attributes);
702 if (info->DeletePending)
703 fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING;
704
705 if (info->LastAccessTime)
706 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
707 else
708 ktime_get_coarse_real_ts64(&fattr->cf_atime);
709
710 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
711 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
712
713 if (adjust_tz) {
714 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
715 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
716 }
717
718 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
719 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
720 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
721
722 fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
723 if (reparse_tag == IO_REPARSE_TAG_LX_SYMLINK) {
724 fattr->cf_mode |= S_IFLNK | cifs_sb->ctx->file_mode;
725 fattr->cf_dtype = DT_LNK;
726 } else if (reparse_tag == IO_REPARSE_TAG_LX_FIFO) {
727 fattr->cf_mode |= S_IFIFO | cifs_sb->ctx->file_mode;
728 fattr->cf_dtype = DT_FIFO;
729 } else if (reparse_tag == IO_REPARSE_TAG_AF_UNIX) {
730 fattr->cf_mode |= S_IFSOCK | cifs_sb->ctx->file_mode;
731 fattr->cf_dtype = DT_SOCK;
732 } else if (reparse_tag == IO_REPARSE_TAG_LX_CHR) {
733 fattr->cf_mode |= S_IFCHR | cifs_sb->ctx->file_mode;
734 fattr->cf_dtype = DT_CHR;
735 } else if (reparse_tag == IO_REPARSE_TAG_LX_BLK) {
736 fattr->cf_mode |= S_IFBLK | cifs_sb->ctx->file_mode;
737 fattr->cf_dtype = DT_BLK;
738 } else if (symlink || reparse_tag == IO_REPARSE_TAG_SYMLINK ||
739 reparse_tag == IO_REPARSE_TAG_NFS) {
740 fattr->cf_mode = S_IFLNK;
741 fattr->cf_dtype = DT_LNK;
742 } else if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
743 fattr->cf_mode = S_IFDIR | cifs_sb->ctx->dir_mode;
744 fattr->cf_dtype = DT_DIR;
745 /*
746 * Server can return wrong NumberOfLinks value for directories
747 * when Unix extensions are disabled - fake it.
748 */
749 if (!tcon->unix_ext)
750 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
751 } else {
752 fattr->cf_mode = S_IFREG | cifs_sb->ctx->file_mode;
753 fattr->cf_dtype = DT_REG;
754
755 /* clear write bits if ATTR_READONLY is set */
756 if (fattr->cf_cifsattrs & ATTR_READONLY)
757 fattr->cf_mode &= ~(S_IWUGO);
758
759 /*
760 * Don't accept zero nlink from non-unix servers unless
761 * delete is pending. Instead mark it as unknown.
762 */
763 if ((fattr->cf_nlink < 1) && !tcon->unix_ext &&
764 !info->DeletePending) {
765 cifs_dbg(VFS, "bogus file nlink value %u\n",
766 fattr->cf_nlink);
767 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
768 }
769 }
770
771 if (S_ISLNK(fattr->cf_mode)) {
772 fattr->cf_symlink_target = data->symlink_target;
773 data->symlink_target = NULL;
774 }
775
776 fattr->cf_uid = cifs_sb->ctx->linux_uid;
777 fattr->cf_gid = cifs_sb->ctx->linux_gid;
778}
779
780static int
781cifs_get_file_info(struct file *filp)
782{
783 int rc;
784 unsigned int xid;
785 struct cifs_open_info_data data = {};
786 struct cifs_fattr fattr;
787 struct inode *inode = file_inode(filp);
788 struct cifsFileInfo *cfile = filp->private_data;
789 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
790 struct TCP_Server_Info *server = tcon->ses->server;
791 bool symlink = false;
792 u32 tag = 0;
793
794 if (!server->ops->query_file_info)
795 return -ENOSYS;
796
797 xid = get_xid();
798 rc = server->ops->query_file_info(xid, tcon, cfile, &data);
799 switch (rc) {
800 case 0:
801 /* TODO: add support to query reparse tag */
802 if (data.symlink_target) {
803 symlink = true;
804 tag = IO_REPARSE_TAG_SYMLINK;
805 }
806 cifs_open_info_to_fattr(&fattr, &data, inode->i_sb, false, symlink, tag);
807 break;
808 case -EREMOTE:
809 cifs_create_dfs_fattr(&fattr, inode->i_sb);
810 rc = 0;
811 break;
812 case -EOPNOTSUPP:
813 case -EINVAL:
814 /*
815 * FIXME: legacy server -- fall back to path-based call?
816 * for now, just skip revalidating and mark inode for
817 * immediate reval.
818 */
819 rc = 0;
820 CIFS_I(inode)->time = 0;
821 goto cgfi_exit;
822 default:
823 goto cgfi_exit;
824 }
825
826 /*
827 * don't bother with SFU junk here -- just mark inode as needing
828 * revalidation.
829 */
830 fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
831 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
832 /* if filetype is different, return error */
833 rc = cifs_fattr_to_inode(inode, &fattr);
834cgfi_exit:
835 cifs_free_open_info(&data);
836 free_xid(xid);
837 return rc;
838}
839
840/* Simple function to return a 64 bit hash of string. Rarely called */
841static __u64 simple_hashstr(const char *str)
842{
843 const __u64 hash_mult = 1125899906842597ULL; /* a big enough prime */
844 __u64 hash = 0;
845
846 while (*str)
847 hash = (hash + (__u64) *str++) * hash_mult;
848
849 return hash;
850}
851
852#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
853/**
854 * cifs_backup_query_path_info - SMB1 fallback code to get ino
855 *
856 * Fallback code to get file metadata when we don't have access to
857 * full_path (EACCES) and have backup creds.
858 *
859 * @xid: transaction id used to identify original request in logs
860 * @tcon: information about the server share we have mounted
861 * @sb: the superblock stores info such as disk space available
862 * @full_path: name of the file we are getting the metadata for
863 * @resp_buf: will be set to cifs resp buf and needs to be freed with
864 * cifs_buf_release() when done with @data
865 * @data: will be set to search info result buffer
866 */
867static int
868cifs_backup_query_path_info(int xid,
869 struct cifs_tcon *tcon,
870 struct super_block *sb,
871 const char *full_path,
872 void **resp_buf,
873 FILE_ALL_INFO **data)
874{
875 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
876 struct cifs_search_info info = {0};
877 u16 flags;
878 int rc;
879
880 *resp_buf = NULL;
881 info.endOfSearch = false;
882 if (tcon->unix_ext)
883 info.info_level = SMB_FIND_FILE_UNIX;
884 else if ((tcon->ses->capabilities &
885 tcon->ses->server->vals->cap_nt_find) == 0)
886 info.info_level = SMB_FIND_FILE_INFO_STANDARD;
887 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
888 info.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
889 else /* no srvino useful for fallback to some netapp */
890 info.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
891
892 flags = CIFS_SEARCH_CLOSE_ALWAYS |
893 CIFS_SEARCH_CLOSE_AT_END |
894 CIFS_SEARCH_BACKUP_SEARCH;
895
896 rc = CIFSFindFirst(xid, tcon, full_path,
897 cifs_sb, NULL, flags, &info, false);
898 if (rc)
899 return rc;
900
901 *resp_buf = (void *)info.ntwrk_buf_start;
902 *data = (FILE_ALL_INFO *)info.srch_entries_start;
903 return 0;
904}
905#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
906
907static void cifs_set_fattr_ino(int xid, struct cifs_tcon *tcon, struct super_block *sb,
908 struct inode **inode, const char *full_path,
909 struct cifs_open_info_data *data, struct cifs_fattr *fattr)
910{
911 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
912 struct TCP_Server_Info *server = tcon->ses->server;
913 int rc;
914
915 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
916 if (*inode)
917 fattr->cf_uniqueid = CIFS_I(*inode)->uniqueid;
918 else
919 fattr->cf_uniqueid = iunique(sb, ROOT_I);
920 return;
921 }
922
923 /*
924 * If we have an inode pass a NULL tcon to ensure we don't
925 * make a round trip to the server. This only works for SMB2+.
926 */
927 rc = server->ops->get_srv_inum(xid, *inode ? NULL : tcon, cifs_sb, full_path,
928 &fattr->cf_uniqueid, data);
929 if (rc) {
930 /*
931 * If that fails reuse existing ino or generate one
932 * and disable server ones
933 */
934 if (*inode)
935 fattr->cf_uniqueid = CIFS_I(*inode)->uniqueid;
936 else {
937 fattr->cf_uniqueid = iunique(sb, ROOT_I);
938 cifs_autodisable_serverino(cifs_sb);
939 }
940 return;
941 }
942
943 /* If no errors, check for zero root inode (invalid) */
944 if (fattr->cf_uniqueid == 0 && strlen(full_path) == 0) {
945 cifs_dbg(FYI, "Invalid (0) inodenum\n");
946 if (*inode) {
947 /* reuse */
948 fattr->cf_uniqueid = CIFS_I(*inode)->uniqueid;
949 } else {
950 /* make an ino by hashing the UNC */
951 fattr->cf_flags |= CIFS_FATTR_FAKE_ROOT_INO;
952 fattr->cf_uniqueid = simple_hashstr(tcon->tree_name);
953 }
954 }
955}
956
957static inline bool is_inode_cache_good(struct inode *ino)
958{
959 return ino && CIFS_CACHE_READ(CIFS_I(ino)) && CIFS_I(ino)->time != 0;
960}
961
962int cifs_get_inode_info(struct inode **inode, const char *full_path,
963 struct cifs_open_info_data *data, struct super_block *sb, int xid,
964 const struct cifs_fid *fid)
965{
966 struct cifs_tcon *tcon;
967 struct TCP_Server_Info *server;
968 struct tcon_link *tlink;
969 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
970 bool adjust_tz = false;
971 struct cifs_fattr fattr = {0};
972 bool is_reparse_point = false;
973 struct cifs_open_info_data tmp_data = {};
974 void *smb1_backup_rsp_buf = NULL;
975 int rc = 0;
976 int tmprc = 0;
977 __u32 reparse_tag = 0;
978
979 tlink = cifs_sb_tlink(cifs_sb);
980 if (IS_ERR(tlink))
981 return PTR_ERR(tlink);
982 tcon = tlink_tcon(tlink);
983 server = tcon->ses->server;
984
985 /*
986 * 1. Fetch file metadata if not provided (data)
987 */
988
989 if (!data) {
990 if (is_inode_cache_good(*inode)) {
991 cifs_dbg(FYI, "No need to revalidate cached inode sizes\n");
992 goto out;
993 }
994 rc = server->ops->query_path_info(xid, tcon, cifs_sb, full_path, &tmp_data,
995 &adjust_tz, &is_reparse_point);
996 data = &tmp_data;
997 }
998
999 /*
1000 * 2. Convert it to internal cifs metadata (fattr)
1001 */
1002
1003 switch (rc) {
1004 case 0:
1005 /*
1006 * If the file is a reparse point, it is more complicated
1007 * since we have to check if its reparse tag matches a known
1008 * special file type e.g. symlink or fifo or char etc.
1009 */
1010 if (is_reparse_point && data->symlink_target) {
1011 reparse_tag = IO_REPARSE_TAG_SYMLINK;
1012 } else if ((le32_to_cpu(data->fi.Attributes) & ATTR_REPARSE) &&
1013 server->ops->query_reparse_tag) {
1014 tmprc = server->ops->query_reparse_tag(xid, tcon, cifs_sb, full_path,
1015 &reparse_tag);
1016 if (tmprc)
1017 cifs_dbg(FYI, "%s: query_reparse_tag: rc = %d\n", __func__, tmprc);
1018 if (server->ops->query_symlink) {
1019 tmprc = server->ops->query_symlink(xid, tcon, cifs_sb, full_path,
1020 &data->symlink_target,
1021 is_reparse_point);
1022 if (tmprc)
1023 cifs_dbg(FYI, "%s: query_symlink: rc = %d\n", __func__,
1024 tmprc);
1025 }
1026 }
1027 cifs_open_info_to_fattr(&fattr, data, sb, adjust_tz, is_reparse_point, reparse_tag);
1028 break;
1029 case -EREMOTE:
1030 /* DFS link, no metadata available on this server */
1031 cifs_create_dfs_fattr(&fattr, sb);
1032 rc = 0;
1033 break;
1034 case -EACCES:
1035#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1036 /*
1037 * perm errors, try again with backup flags if possible
1038 *
1039 * For SMB2 and later the backup intent flag
1040 * is already sent if needed on open and there
1041 * is no path based FindFirst operation to use
1042 * to retry with
1043 */
1044 if (backup_cred(cifs_sb) && is_smb1_server(server)) {
1045 /* for easier reading */
1046 FILE_ALL_INFO *fi;
1047 FILE_DIRECTORY_INFO *fdi;
1048 SEARCH_ID_FULL_DIR_INFO *si;
1049
1050 rc = cifs_backup_query_path_info(xid, tcon, sb,
1051 full_path,
1052 &smb1_backup_rsp_buf,
1053 &fi);
1054 if (rc)
1055 goto out;
1056
1057 move_cifs_info_to_smb2(&data->fi, fi);
1058 fdi = (FILE_DIRECTORY_INFO *)fi;
1059 si = (SEARCH_ID_FULL_DIR_INFO *)fi;
1060
1061 cifs_dir_info_to_fattr(&fattr, fdi, cifs_sb);
1062 fattr.cf_uniqueid = le64_to_cpu(si->UniqueId);
1063 /* uniqueid set, skip get inum step */
1064 goto handle_mnt_opt;
1065 } else {
1066 /* nothing we can do, bail out */
1067 goto out;
1068 }
1069#else
1070 goto out;
1071#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1072 break;
1073 default:
1074 cifs_dbg(FYI, "%s: unhandled err rc %d\n", __func__, rc);
1075 goto out;
1076 }
1077
1078 /*
1079 * 3. Get or update inode number (fattr.cf_uniqueid)
1080 */
1081
1082 cifs_set_fattr_ino(xid, tcon, sb, inode, full_path, data, &fattr);
1083
1084 /*
1085 * 4. Tweak fattr based on mount options
1086 */
1087#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1088handle_mnt_opt:
1089#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1090 /* query for SFU type info if supported and needed */
1091 if (fattr.cf_cifsattrs & ATTR_SYSTEM &&
1092 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
1093 tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid);
1094 if (tmprc)
1095 cifs_dbg(FYI, "cifs_sfu_type failed: %d\n", tmprc);
1096 }
1097
1098 /* fill in 0777 bits from ACL */
1099 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) {
1100 rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, true,
1101 full_path, fid);
1102 if (rc == -EREMOTE)
1103 rc = 0;
1104 if (rc) {
1105 cifs_dbg(FYI, "%s: Get mode from SID failed. rc=%d\n",
1106 __func__, rc);
1107 goto out;
1108 }
1109 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
1110 rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, false,
1111 full_path, fid);
1112 if (rc == -EREMOTE)
1113 rc = 0;
1114 if (rc) {
1115 cifs_dbg(FYI, "%s: Getting ACL failed with error: %d\n",
1116 __func__, rc);
1117 goto out;
1118 }
1119 }
1120
1121 /* fill in remaining high mode bits e.g. SUID, VTX */
1122 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
1123 cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
1124
1125 /* check for Minshall+French symlinks */
1126 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
1127 tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
1128 full_path);
1129 if (tmprc)
1130 cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
1131 }
1132
1133 /*
1134 * 5. Update inode with final fattr data
1135 */
1136
1137 if (!*inode) {
1138 *inode = cifs_iget(sb, &fattr);
1139 if (!*inode)
1140 rc = -ENOMEM;
1141 } else {
1142 /* we already have inode, update it */
1143
1144 /* if uniqueid is different, return error */
1145 if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
1146 CIFS_I(*inode)->uniqueid != fattr.cf_uniqueid)) {
1147 CIFS_I(*inode)->time = 0; /* force reval */
1148 rc = -ESTALE;
1149 goto out;
1150 }
1151 /* if filetype is different, return error */
1152 rc = cifs_fattr_to_inode(*inode, &fattr);
1153 }
1154out:
1155 cifs_buf_release(smb1_backup_rsp_buf);
1156 cifs_put_tlink(tlink);
1157 cifs_free_open_info(&tmp_data);
1158 kfree(fattr.cf_symlink_target);
1159 return rc;
1160}
1161
1162int
1163smb311_posix_get_inode_info(struct inode **inode,
1164 const char *full_path,
1165 struct super_block *sb, unsigned int xid)
1166{
1167 struct cifs_tcon *tcon;
1168 struct tcon_link *tlink;
1169 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1170 bool adjust_tz = false;
1171 struct cifs_fattr fattr = {0};
1172 bool symlink = false;
1173 struct cifs_open_info_data data = {};
1174 struct cifs_sid owner, group;
1175 int rc = 0;
1176 int tmprc = 0;
1177
1178 tlink = cifs_sb_tlink(cifs_sb);
1179 if (IS_ERR(tlink))
1180 return PTR_ERR(tlink);
1181 tcon = tlink_tcon(tlink);
1182
1183 /*
1184 * 1. Fetch file metadata
1185 */
1186
1187 if (is_inode_cache_good(*inode)) {
1188 cifs_dbg(FYI, "No need to revalidate cached inode sizes\n");
1189 goto out;
1190 }
1191
1192 rc = smb311_posix_query_path_info(xid, tcon, cifs_sb, full_path, &data,
1193 &owner, &group, &adjust_tz,
1194 &symlink);
1195
1196 /*
1197 * 2. Convert it to internal cifs metadata (fattr)
1198 */
1199
1200 switch (rc) {
1201 case 0:
1202 smb311_posix_info_to_fattr(&fattr, &data, &owner, &group,
1203 sb, adjust_tz, symlink);
1204 break;
1205 case -EREMOTE:
1206 /* DFS link, no metadata available on this server */
1207 cifs_create_dfs_fattr(&fattr, sb);
1208 rc = 0;
1209 break;
1210 case -EACCES:
1211 /*
1212 * For SMB2 and later the backup intent flag
1213 * is already sent if needed on open and there
1214 * is no path based FindFirst operation to use
1215 * to retry with so nothing we can do, bail out
1216 */
1217 goto out;
1218 default:
1219 cifs_dbg(FYI, "%s: unhandled err rc %d\n", __func__, rc);
1220 goto out;
1221 }
1222
1223
1224 /*
1225 * 3. Tweak fattr based on mount options
1226 */
1227
1228 /* check for Minshall+French symlinks */
1229 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
1230 tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
1231 full_path);
1232 if (tmprc)
1233 cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
1234 }
1235
1236 /*
1237 * 4. Update inode with final fattr data
1238 */
1239
1240 if (!*inode) {
1241 *inode = cifs_iget(sb, &fattr);
1242 if (!*inode)
1243 rc = -ENOMEM;
1244 } else {
1245 /* we already have inode, update it */
1246
1247 /* if uniqueid is different, return error */
1248 if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
1249 CIFS_I(*inode)->uniqueid != fattr.cf_uniqueid)) {
1250 CIFS_I(*inode)->time = 0; /* force reval */
1251 rc = -ESTALE;
1252 goto out;
1253 }
1254
1255 /* if filetype is different, return error */
1256 rc = cifs_fattr_to_inode(*inode, &fattr);
1257 }
1258out:
1259 cifs_put_tlink(tlink);
1260 cifs_free_open_info(&data);
1261 kfree(fattr.cf_symlink_target);
1262 return rc;
1263}
1264
1265
1266static const struct inode_operations cifs_ipc_inode_ops = {
1267 .lookup = cifs_lookup,
1268};
1269
1270static int
1271cifs_find_inode(struct inode *inode, void *opaque)
1272{
1273 struct cifs_fattr *fattr = opaque;
1274
1275 /* don't match inode with different uniqueid */
1276 if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
1277 return 0;
1278
1279 /* use createtime like an i_generation field */
1280 if (CIFS_I(inode)->createtime != fattr->cf_createtime)
1281 return 0;
1282
1283 /* don't match inode of different type */
1284 if (inode_wrong_type(inode, fattr->cf_mode))
1285 return 0;
1286
1287 /* if it's not a directory or has no dentries, then flag it */
1288 if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry))
1289 fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
1290
1291 return 1;
1292}
1293
1294static int
1295cifs_init_inode(struct inode *inode, void *opaque)
1296{
1297 struct cifs_fattr *fattr = opaque;
1298
1299 CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
1300 CIFS_I(inode)->createtime = fattr->cf_createtime;
1301 return 0;
1302}
1303
1304/*
1305 * walk dentry list for an inode and report whether it has aliases that
1306 * are hashed. We use this to determine if a directory inode can actually
1307 * be used.
1308 */
1309static bool
1310inode_has_hashed_dentries(struct inode *inode)
1311{
1312 struct dentry *dentry;
1313
1314 spin_lock(&inode->i_lock);
1315 hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) {
1316 if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
1317 spin_unlock(&inode->i_lock);
1318 return true;
1319 }
1320 }
1321 spin_unlock(&inode->i_lock);
1322 return false;
1323}
1324
1325/* Given fattrs, get a corresponding inode */
1326struct inode *
1327cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
1328{
1329 unsigned long hash;
1330 struct inode *inode;
1331
1332retry_iget5_locked:
1333 cifs_dbg(FYI, "looking for uniqueid=%llu\n", fattr->cf_uniqueid);
1334
1335 /* hash down to 32-bits on 32-bit arch */
1336 hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
1337
1338 inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
1339 if (inode) {
1340 /* was there a potentially problematic inode collision? */
1341 if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
1342 fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
1343
1344 if (inode_has_hashed_dentries(inode)) {
1345 cifs_autodisable_serverino(CIFS_SB(sb));
1346 iput(inode);
1347 fattr->cf_uniqueid = iunique(sb, ROOT_I);
1348 goto retry_iget5_locked;
1349 }
1350 }
1351
1352 /* can't fail - see cifs_find_inode() */
1353 cifs_fattr_to_inode(inode, fattr);
1354 if (sb->s_flags & SB_NOATIME)
1355 inode->i_flags |= S_NOATIME | S_NOCMTIME;
1356 if (inode->i_state & I_NEW) {
1357 inode->i_ino = hash;
1358 cifs_fscache_get_inode_cookie(inode);
1359 unlock_new_inode(inode);
1360 }
1361 }
1362
1363 return inode;
1364}
1365
1366/* gets root inode */
1367struct inode *cifs_root_iget(struct super_block *sb)
1368{
1369 unsigned int xid;
1370 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1371 struct inode *inode = NULL;
1372 long rc;
1373 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
1374 char *path = NULL;
1375 int len;
1376
1377 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
1378 && cifs_sb->prepath) {
1379 len = strlen(cifs_sb->prepath);
1380 path = kzalloc(len + 2 /* leading sep + null */, GFP_KERNEL);
1381 if (path == NULL)
1382 return ERR_PTR(-ENOMEM);
1383 path[0] = '/';
1384 memcpy(path+1, cifs_sb->prepath, len);
1385 } else {
1386 path = kstrdup("", GFP_KERNEL);
1387 if (path == NULL)
1388 return ERR_PTR(-ENOMEM);
1389 }
1390
1391 xid = get_xid();
1392 if (tcon->unix_ext) {
1393 rc = cifs_get_inode_info_unix(&inode, path, sb, xid);
1394 /* some servers mistakenly claim POSIX support */
1395 if (rc != -EOPNOTSUPP)
1396 goto iget_no_retry;
1397 cifs_dbg(VFS, "server does not support POSIX extensions\n");
1398 tcon->unix_ext = false;
1399 }
1400
1401 convert_delimiter(path, CIFS_DIR_SEP(cifs_sb));
1402 if (tcon->posix_extensions)
1403 rc = smb311_posix_get_inode_info(&inode, path, sb, xid);
1404 else
1405 rc = cifs_get_inode_info(&inode, path, NULL, sb, xid, NULL);
1406
1407iget_no_retry:
1408 if (!inode) {
1409 inode = ERR_PTR(rc);
1410 goto out;
1411 }
1412
1413 if (rc && tcon->pipe) {
1414 cifs_dbg(FYI, "ipc connection - fake read inode\n");
1415 spin_lock(&inode->i_lock);
1416 inode->i_mode |= S_IFDIR;
1417 set_nlink(inode, 2);
1418 inode->i_op = &cifs_ipc_inode_ops;
1419 inode->i_fop = &simple_dir_operations;
1420 inode->i_uid = cifs_sb->ctx->linux_uid;
1421 inode->i_gid = cifs_sb->ctx->linux_gid;
1422 spin_unlock(&inode->i_lock);
1423 } else if (rc) {
1424 iget_failed(inode);
1425 inode = ERR_PTR(rc);
1426 }
1427
1428out:
1429 kfree(path);
1430 free_xid(xid);
1431 return inode;
1432}
1433
1434int
1435cifs_set_file_info(struct inode *inode, struct iattr *attrs, unsigned int xid,
1436 const char *full_path, __u32 dosattr)
1437{
1438 bool set_time = false;
1439 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1440 struct TCP_Server_Info *server;
1441 FILE_BASIC_INFO info_buf;
1442
1443 if (attrs == NULL)
1444 return -EINVAL;
1445
1446 server = cifs_sb_master_tcon(cifs_sb)->ses->server;
1447 if (!server->ops->set_file_info)
1448 return -ENOSYS;
1449
1450 info_buf.Pad = 0;
1451
1452 if (attrs->ia_valid & ATTR_ATIME) {
1453 set_time = true;
1454 info_buf.LastAccessTime =
1455 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1456 } else
1457 info_buf.LastAccessTime = 0;
1458
1459 if (attrs->ia_valid & ATTR_MTIME) {
1460 set_time = true;
1461 info_buf.LastWriteTime =
1462 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1463 } else
1464 info_buf.LastWriteTime = 0;
1465
1466 /*
1467 * Samba throws this field away, but windows may actually use it.
1468 * Do not set ctime unless other time stamps are changed explicitly
1469 * (i.e. by utimes()) since we would then have a mix of client and
1470 * server times.
1471 */
1472 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1473 cifs_dbg(FYI, "CIFS - CTIME changed\n");
1474 info_buf.ChangeTime =
1475 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1476 } else
1477 info_buf.ChangeTime = 0;
1478
1479 info_buf.CreationTime = 0; /* don't change */
1480 info_buf.Attributes = cpu_to_le32(dosattr);
1481
1482 return server->ops->set_file_info(inode, full_path, &info_buf, xid);
1483}
1484
1485#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1486/*
1487 * Open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
1488 * and rename it to a random name that hopefully won't conflict with
1489 * anything else.
1490 */
1491int
1492cifs_rename_pending_delete(const char *full_path, struct dentry *dentry,
1493 const unsigned int xid)
1494{
1495 int oplock = 0;
1496 int rc;
1497 struct cifs_fid fid;
1498 struct cifs_open_parms oparms;
1499 struct inode *inode = d_inode(dentry);
1500 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1501 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1502 struct tcon_link *tlink;
1503 struct cifs_tcon *tcon;
1504 __u32 dosattr, origattr;
1505 FILE_BASIC_INFO *info_buf = NULL;
1506
1507 tlink = cifs_sb_tlink(cifs_sb);
1508 if (IS_ERR(tlink))
1509 return PTR_ERR(tlink);
1510 tcon = tlink_tcon(tlink);
1511
1512 /*
1513 * We cannot rename the file if the server doesn't support
1514 * CAP_INFOLEVEL_PASSTHRU
1515 */
1516 if (!(tcon->ses->capabilities & CAP_INFOLEVEL_PASSTHRU)) {
1517 rc = -EBUSY;
1518 goto out;
1519 }
1520
1521 oparms.tcon = tcon;
1522 oparms.cifs_sb = cifs_sb;
1523 oparms.desired_access = DELETE | FILE_WRITE_ATTRIBUTES;
1524 oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
1525 oparms.disposition = FILE_OPEN;
1526 oparms.path = full_path;
1527 oparms.fid = &fid;
1528 oparms.reconnect = false;
1529
1530 rc = CIFS_open(xid, &oparms, &oplock, NULL);
1531 if (rc != 0)
1532 goto out;
1533
1534 origattr = cifsInode->cifsAttrs;
1535 if (origattr == 0)
1536 origattr |= ATTR_NORMAL;
1537
1538 dosattr = origattr & ~ATTR_READONLY;
1539 if (dosattr == 0)
1540 dosattr |= ATTR_NORMAL;
1541 dosattr |= ATTR_HIDDEN;
1542
1543 /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
1544 if (dosattr != origattr) {
1545 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
1546 if (info_buf == NULL) {
1547 rc = -ENOMEM;
1548 goto out_close;
1549 }
1550 info_buf->Attributes = cpu_to_le32(dosattr);
1551 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid,
1552 current->tgid);
1553 /* although we would like to mark the file hidden
1554 if that fails we will still try to rename it */
1555 if (!rc)
1556 cifsInode->cifsAttrs = dosattr;
1557 else
1558 dosattr = origattr; /* since not able to change them */
1559 }
1560
1561 /* rename the file */
1562 rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, NULL,
1563 cifs_sb->local_nls,
1564 cifs_remap(cifs_sb));
1565 if (rc != 0) {
1566 rc = -EBUSY;
1567 goto undo_setattr;
1568 }
1569
1570 /* try to set DELETE_ON_CLOSE */
1571 if (!test_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags)) {
1572 rc = CIFSSMBSetFileDisposition(xid, tcon, true, fid.netfid,
1573 current->tgid);
1574 /*
1575 * some samba versions return -ENOENT when we try to set the
1576 * file disposition here. Likely a samba bug, but work around
1577 * it for now. This means that some cifsXXX files may hang
1578 * around after they shouldn't.
1579 *
1580 * BB: remove this hack after more servers have the fix
1581 */
1582 if (rc == -ENOENT)
1583 rc = 0;
1584 else if (rc != 0) {
1585 rc = -EBUSY;
1586 goto undo_rename;
1587 }
1588 set_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags);
1589 }
1590
1591out_close:
1592 CIFSSMBClose(xid, tcon, fid.netfid);
1593out:
1594 kfree(info_buf);
1595 cifs_put_tlink(tlink);
1596 return rc;
1597
1598 /*
1599 * reset everything back to the original state. Don't bother
1600 * dealing with errors here since we can't do anything about
1601 * them anyway.
1602 */
1603undo_rename:
1604 CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, dentry->d_name.name,
1605 cifs_sb->local_nls, cifs_remap(cifs_sb));
1606undo_setattr:
1607 if (dosattr != origattr) {
1608 info_buf->Attributes = cpu_to_le32(origattr);
1609 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid,
1610 current->tgid))
1611 cifsInode->cifsAttrs = origattr;
1612 }
1613
1614 goto out_close;
1615}
1616#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1617
1618/* copied from fs/nfs/dir.c with small changes */
1619static void
1620cifs_drop_nlink(struct inode *inode)
1621{
1622 spin_lock(&inode->i_lock);
1623 if (inode->i_nlink > 0)
1624 drop_nlink(inode);
1625 spin_unlock(&inode->i_lock);
1626}
1627
1628/*
1629 * If d_inode(dentry) is null (usually meaning the cached dentry
1630 * is a negative dentry) then we would attempt a standard SMB delete, but
1631 * if that fails we can not attempt the fall back mechanisms on EACCES
1632 * but will return the EACCES to the caller. Note that the VFS does not call
1633 * unlink on negative dentries currently.
1634 */
1635int cifs_unlink(struct inode *dir, struct dentry *dentry)
1636{
1637 int rc = 0;
1638 unsigned int xid;
1639 const char *full_path;
1640 void *page;
1641 struct inode *inode = d_inode(dentry);
1642 struct cifsInodeInfo *cifs_inode;
1643 struct super_block *sb = dir->i_sb;
1644 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1645 struct tcon_link *tlink;
1646 struct cifs_tcon *tcon;
1647 struct TCP_Server_Info *server;
1648 struct iattr *attrs = NULL;
1649 __u32 dosattr = 0, origattr = 0;
1650
1651 cifs_dbg(FYI, "cifs_unlink, dir=0x%p, dentry=0x%p\n", dir, dentry);
1652
1653 if (unlikely(cifs_forced_shutdown(cifs_sb)))
1654 return -EIO;
1655
1656 tlink = cifs_sb_tlink(cifs_sb);
1657 if (IS_ERR(tlink))
1658 return PTR_ERR(tlink);
1659 tcon = tlink_tcon(tlink);
1660 server = tcon->ses->server;
1661
1662 xid = get_xid();
1663 page = alloc_dentry_path();
1664
1665 if (tcon->nodelete) {
1666 rc = -EACCES;
1667 goto unlink_out;
1668 }
1669
1670 /* Unlink can be called from rename so we can not take the
1671 * sb->s_vfs_rename_mutex here */
1672 full_path = build_path_from_dentry(dentry, page);
1673 if (IS_ERR(full_path)) {
1674 rc = PTR_ERR(full_path);
1675 goto unlink_out;
1676 }
1677
1678 cifs_close_deferred_file_under_dentry(tcon, full_path);
1679#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1680 if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1681 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1682 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
1683 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
1684 cifs_remap(cifs_sb));
1685 cifs_dbg(FYI, "posix del rc %d\n", rc);
1686 if ((rc == 0) || (rc == -ENOENT))
1687 goto psx_del_no_retry;
1688 }
1689#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1690
1691retry_std_delete:
1692 if (!server->ops->unlink) {
1693 rc = -ENOSYS;
1694 goto psx_del_no_retry;
1695 }
1696
1697 rc = server->ops->unlink(xid, tcon, full_path, cifs_sb);
1698
1699psx_del_no_retry:
1700 if (!rc) {
1701 if (inode)
1702 cifs_drop_nlink(inode);
1703 } else if (rc == -ENOENT) {
1704 d_drop(dentry);
1705 } else if (rc == -EBUSY) {
1706 if (server->ops->rename_pending_delete) {
1707 rc = server->ops->rename_pending_delete(full_path,
1708 dentry, xid);
1709 if (rc == 0)
1710 cifs_drop_nlink(inode);
1711 }
1712 } else if ((rc == -EACCES) && (dosattr == 0) && inode) {
1713 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1714 if (attrs == NULL) {
1715 rc = -ENOMEM;
1716 goto out_reval;
1717 }
1718
1719 /* try to reset dos attributes */
1720 cifs_inode = CIFS_I(inode);
1721 origattr = cifs_inode->cifsAttrs;
1722 if (origattr == 0)
1723 origattr |= ATTR_NORMAL;
1724 dosattr = origattr & ~ATTR_READONLY;
1725 if (dosattr == 0)
1726 dosattr |= ATTR_NORMAL;
1727 dosattr |= ATTR_HIDDEN;
1728
1729 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1730 if (rc != 0)
1731 goto out_reval;
1732
1733 goto retry_std_delete;
1734 }
1735
1736 /* undo the setattr if we errored out and it's needed */
1737 if (rc != 0 && dosattr != 0)
1738 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
1739
1740out_reval:
1741 if (inode) {
1742 cifs_inode = CIFS_I(inode);
1743 cifs_inode->time = 0; /* will force revalidate to get info
1744 when needed */
1745 inode->i_ctime = current_time(inode);
1746 }
1747 dir->i_ctime = dir->i_mtime = current_time(dir);
1748 cifs_inode = CIFS_I(dir);
1749 CIFS_I(dir)->time = 0; /* force revalidate of dir as well */
1750unlink_out:
1751 free_dentry_path(page);
1752 kfree(attrs);
1753 free_xid(xid);
1754 cifs_put_tlink(tlink);
1755 return rc;
1756}
1757
1758static int
1759cifs_mkdir_qinfo(struct inode *parent, struct dentry *dentry, umode_t mode,
1760 const char *full_path, struct cifs_sb_info *cifs_sb,
1761 struct cifs_tcon *tcon, const unsigned int xid)
1762{
1763 int rc = 0;
1764 struct inode *inode = NULL;
1765
1766 if (tcon->posix_extensions)
1767 rc = smb311_posix_get_inode_info(&inode, full_path, parent->i_sb, xid);
1768#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1769 else if (tcon->unix_ext)
1770 rc = cifs_get_inode_info_unix(&inode, full_path, parent->i_sb,
1771 xid);
1772#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1773 else
1774 rc = cifs_get_inode_info(&inode, full_path, NULL, parent->i_sb,
1775 xid, NULL);
1776
1777 if (rc)
1778 return rc;
1779
1780 if (!S_ISDIR(inode->i_mode)) {
1781 /*
1782 * mkdir succeeded, but another client has managed to remove the
1783 * sucker and replace it with non-directory. Return success,
1784 * but don't leave the child in dcache.
1785 */
1786 iput(inode);
1787 d_drop(dentry);
1788 return 0;
1789 }
1790 /*
1791 * setting nlink not necessary except in cases where we failed to get it
1792 * from the server or was set bogus. Also, since this is a brand new
1793 * inode, no need to grab the i_lock before setting the i_nlink.
1794 */
1795 if (inode->i_nlink < 2)
1796 set_nlink(inode, 2);
1797 mode &= ~current_umask();
1798 /* must turn on setgid bit if parent dir has it */
1799 if (parent->i_mode & S_ISGID)
1800 mode |= S_ISGID;
1801
1802#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1803 if (tcon->unix_ext) {
1804 struct cifs_unix_set_info_args args = {
1805 .mode = mode,
1806 .ctime = NO_CHANGE_64,
1807 .atime = NO_CHANGE_64,
1808 .mtime = NO_CHANGE_64,
1809 .device = 0,
1810 };
1811 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1812 args.uid = current_fsuid();
1813 if (parent->i_mode & S_ISGID)
1814 args.gid = parent->i_gid;
1815 else
1816 args.gid = current_fsgid();
1817 } else {
1818 args.uid = INVALID_UID; /* no change */
1819 args.gid = INVALID_GID; /* no change */
1820 }
1821 CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
1822 cifs_sb->local_nls,
1823 cifs_remap(cifs_sb));
1824 } else {
1825#else
1826 {
1827#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1828 struct TCP_Server_Info *server = tcon->ses->server;
1829 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1830 (mode & S_IWUGO) == 0 && server->ops->mkdir_setinfo)
1831 server->ops->mkdir_setinfo(inode, full_path, cifs_sb,
1832 tcon, xid);
1833 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
1834 inode->i_mode = (mode | S_IFDIR);
1835
1836 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1837 inode->i_uid = current_fsuid();
1838 if (inode->i_mode & S_ISGID)
1839 inode->i_gid = parent->i_gid;
1840 else
1841 inode->i_gid = current_fsgid();
1842 }
1843 }
1844 d_instantiate(dentry, inode);
1845 return 0;
1846}
1847
1848#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1849static int
1850cifs_posix_mkdir(struct inode *inode, struct dentry *dentry, umode_t mode,
1851 const char *full_path, struct cifs_sb_info *cifs_sb,
1852 struct cifs_tcon *tcon, const unsigned int xid)
1853{
1854 int rc = 0;
1855 u32 oplock = 0;
1856 FILE_UNIX_BASIC_INFO *info = NULL;
1857 struct inode *newinode = NULL;
1858 struct cifs_fattr fattr;
1859
1860 info = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1861 if (info == NULL) {
1862 rc = -ENOMEM;
1863 goto posix_mkdir_out;
1864 }
1865
1866 mode &= ~current_umask();
1867 rc = CIFSPOSIXCreate(xid, tcon, SMB_O_DIRECTORY | SMB_O_CREAT, mode,
1868 NULL /* netfid */, info, &oplock, full_path,
1869 cifs_sb->local_nls, cifs_remap(cifs_sb));
1870 if (rc == -EOPNOTSUPP)
1871 goto posix_mkdir_out;
1872 else if (rc) {
1873 cifs_dbg(FYI, "posix mkdir returned 0x%x\n", rc);
1874 d_drop(dentry);
1875 goto posix_mkdir_out;
1876 }
1877
1878 if (info->Type == cpu_to_le32(-1))
1879 /* no return info, go query for it */
1880 goto posix_mkdir_get_info;
1881 /*
1882 * BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if
1883 * need to set uid/gid.
1884 */
1885
1886 cifs_unix_basic_to_fattr(&fattr, info, cifs_sb);
1887 cifs_fill_uniqueid(inode->i_sb, &fattr);
1888 newinode = cifs_iget(inode->i_sb, &fattr);
1889 if (!newinode)
1890 goto posix_mkdir_get_info;
1891
1892 d_instantiate(dentry, newinode);
1893
1894#ifdef CONFIG_CIFS_DEBUG2
1895 cifs_dbg(FYI, "instantiated dentry %p %pd to inode %p\n",
1896 dentry, dentry, newinode);
1897
1898 if (newinode->i_nlink != 2)
1899 cifs_dbg(FYI, "unexpected number of links %d\n",
1900 newinode->i_nlink);
1901#endif
1902
1903posix_mkdir_out:
1904 kfree(info);
1905 return rc;
1906posix_mkdir_get_info:
1907 rc = cifs_mkdir_qinfo(inode, dentry, mode, full_path, cifs_sb, tcon,
1908 xid);
1909 goto posix_mkdir_out;
1910}
1911#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1912
1913int cifs_mkdir(struct user_namespace *mnt_userns, struct inode *inode,
1914 struct dentry *direntry, umode_t mode)
1915{
1916 int rc = 0;
1917 unsigned int xid;
1918 struct cifs_sb_info *cifs_sb;
1919 struct tcon_link *tlink;
1920 struct cifs_tcon *tcon;
1921 struct TCP_Server_Info *server;
1922 const char *full_path;
1923 void *page;
1924
1925 cifs_dbg(FYI, "In cifs_mkdir, mode = %04ho inode = 0x%p\n",
1926 mode, inode);
1927
1928 cifs_sb = CIFS_SB(inode->i_sb);
1929 if (unlikely(cifs_forced_shutdown(cifs_sb)))
1930 return -EIO;
1931 tlink = cifs_sb_tlink(cifs_sb);
1932 if (IS_ERR(tlink))
1933 return PTR_ERR(tlink);
1934 tcon = tlink_tcon(tlink);
1935
1936 xid = get_xid();
1937
1938 page = alloc_dentry_path();
1939 full_path = build_path_from_dentry(direntry, page);
1940 if (IS_ERR(full_path)) {
1941 rc = PTR_ERR(full_path);
1942 goto mkdir_out;
1943 }
1944
1945 server = tcon->ses->server;
1946
1947 if ((server->ops->posix_mkdir) && (tcon->posix_extensions)) {
1948 rc = server->ops->posix_mkdir(xid, inode, mode, tcon, full_path,
1949 cifs_sb);
1950 d_drop(direntry); /* for time being always refresh inode info */
1951 goto mkdir_out;
1952 }
1953
1954#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1955 if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1956 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1957 rc = cifs_posix_mkdir(inode, direntry, mode, full_path, cifs_sb,
1958 tcon, xid);
1959 if (rc != -EOPNOTSUPP)
1960 goto mkdir_out;
1961 }
1962#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1963
1964 if (!server->ops->mkdir) {
1965 rc = -ENOSYS;
1966 goto mkdir_out;
1967 }
1968
1969 /* BB add setting the equivalent of mode via CreateX w/ACLs */
1970 rc = server->ops->mkdir(xid, inode, mode, tcon, full_path, cifs_sb);
1971 if (rc) {
1972 cifs_dbg(FYI, "cifs_mkdir returned 0x%x\n", rc);
1973 d_drop(direntry);
1974 goto mkdir_out;
1975 }
1976
1977 /* TODO: skip this for smb2/smb3 */
1978 rc = cifs_mkdir_qinfo(inode, direntry, mode, full_path, cifs_sb, tcon,
1979 xid);
1980mkdir_out:
1981 /*
1982 * Force revalidate to get parent dir info when needed since cached
1983 * attributes are invalid now.
1984 */
1985 CIFS_I(inode)->time = 0;
1986 free_dentry_path(page);
1987 free_xid(xid);
1988 cifs_put_tlink(tlink);
1989 return rc;
1990}
1991
1992int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1993{
1994 int rc = 0;
1995 unsigned int xid;
1996 struct cifs_sb_info *cifs_sb;
1997 struct tcon_link *tlink;
1998 struct cifs_tcon *tcon;
1999 struct TCP_Server_Info *server;
2000 const char *full_path;
2001 void *page = alloc_dentry_path();
2002 struct cifsInodeInfo *cifsInode;
2003
2004 cifs_dbg(FYI, "cifs_rmdir, inode = 0x%p\n", inode);
2005
2006 xid = get_xid();
2007
2008 full_path = build_path_from_dentry(direntry, page);
2009 if (IS_ERR(full_path)) {
2010 rc = PTR_ERR(full_path);
2011 goto rmdir_exit;
2012 }
2013
2014 cifs_sb = CIFS_SB(inode->i_sb);
2015 if (unlikely(cifs_forced_shutdown(cifs_sb))) {
2016 rc = -EIO;
2017 goto rmdir_exit;
2018 }
2019
2020 tlink = cifs_sb_tlink(cifs_sb);
2021 if (IS_ERR(tlink)) {
2022 rc = PTR_ERR(tlink);
2023 goto rmdir_exit;
2024 }
2025 tcon = tlink_tcon(tlink);
2026 server = tcon->ses->server;
2027
2028 if (!server->ops->rmdir) {
2029 rc = -ENOSYS;
2030 cifs_put_tlink(tlink);
2031 goto rmdir_exit;
2032 }
2033
2034 if (tcon->nodelete) {
2035 rc = -EACCES;
2036 cifs_put_tlink(tlink);
2037 goto rmdir_exit;
2038 }
2039
2040 rc = server->ops->rmdir(xid, tcon, full_path, cifs_sb);
2041 cifs_put_tlink(tlink);
2042
2043 if (!rc) {
2044 spin_lock(&d_inode(direntry)->i_lock);
2045 i_size_write(d_inode(direntry), 0);
2046 clear_nlink(d_inode(direntry));
2047 spin_unlock(&d_inode(direntry)->i_lock);
2048 }
2049
2050 cifsInode = CIFS_I(d_inode(direntry));
2051 /* force revalidate to go get info when needed */
2052 cifsInode->time = 0;
2053
2054 cifsInode = CIFS_I(inode);
2055 /*
2056 * Force revalidate to get parent dir info when needed since cached
2057 * attributes are invalid now.
2058 */
2059 cifsInode->time = 0;
2060
2061 d_inode(direntry)->i_ctime = inode->i_ctime = inode->i_mtime =
2062 current_time(inode);
2063
2064rmdir_exit:
2065 free_dentry_path(page);
2066 free_xid(xid);
2067 return rc;
2068}
2069
2070static int
2071cifs_do_rename(const unsigned int xid, struct dentry *from_dentry,
2072 const char *from_path, struct dentry *to_dentry,
2073 const char *to_path)
2074{
2075 struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
2076 struct tcon_link *tlink;
2077 struct cifs_tcon *tcon;
2078 struct TCP_Server_Info *server;
2079#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2080 struct cifs_fid fid;
2081 struct cifs_open_parms oparms;
2082 int oplock;
2083#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2084 int rc;
2085
2086 tlink = cifs_sb_tlink(cifs_sb);
2087 if (IS_ERR(tlink))
2088 return PTR_ERR(tlink);
2089 tcon = tlink_tcon(tlink);
2090 server = tcon->ses->server;
2091
2092 if (!server->ops->rename)
2093 return -ENOSYS;
2094
2095 /* try path-based rename first */
2096 rc = server->ops->rename(xid, tcon, from_path, to_path, cifs_sb);
2097
2098 /*
2099 * Don't bother with rename by filehandle unless file is busy and
2100 * source. Note that cross directory moves do not work with
2101 * rename by filehandle to various Windows servers.
2102 */
2103 if (rc == 0 || rc != -EBUSY)
2104 goto do_rename_exit;
2105
2106 /* Don't fall back to using SMB on SMB 2+ mount */
2107 if (server->vals->protocol_id != 0)
2108 goto do_rename_exit;
2109
2110#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2111 /* open-file renames don't work across directories */
2112 if (to_dentry->d_parent != from_dentry->d_parent)
2113 goto do_rename_exit;
2114
2115 oparms.tcon = tcon;
2116 oparms.cifs_sb = cifs_sb;
2117 /* open the file to be renamed -- we need DELETE perms */
2118 oparms.desired_access = DELETE;
2119 oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
2120 oparms.disposition = FILE_OPEN;
2121 oparms.path = from_path;
2122 oparms.fid = &fid;
2123 oparms.reconnect = false;
2124
2125 rc = CIFS_open(xid, &oparms, &oplock, NULL);
2126 if (rc == 0) {
2127 rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid,
2128 (const char *) to_dentry->d_name.name,
2129 cifs_sb->local_nls, cifs_remap(cifs_sb));
2130 CIFSSMBClose(xid, tcon, fid.netfid);
2131 }
2132#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2133do_rename_exit:
2134 if (rc == 0)
2135 d_move(from_dentry, to_dentry);
2136 cifs_put_tlink(tlink);
2137 return rc;
2138}
2139
2140int
2141cifs_rename2(struct user_namespace *mnt_userns, struct inode *source_dir,
2142 struct dentry *source_dentry, struct inode *target_dir,
2143 struct dentry *target_dentry, unsigned int flags)
2144{
2145 const char *from_name, *to_name;
2146 void *page1, *page2;
2147 struct cifs_sb_info *cifs_sb;
2148 struct tcon_link *tlink;
2149 struct cifs_tcon *tcon;
2150 unsigned int xid;
2151 int rc, tmprc;
2152 int retry_count = 0;
2153 FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
2154#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2155 FILE_UNIX_BASIC_INFO *info_buf_target;
2156#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2157
2158 if (flags & ~RENAME_NOREPLACE)
2159 return -EINVAL;
2160
2161 cifs_sb = CIFS_SB(source_dir->i_sb);
2162 if (unlikely(cifs_forced_shutdown(cifs_sb)))
2163 return -EIO;
2164
2165 tlink = cifs_sb_tlink(cifs_sb);
2166 if (IS_ERR(tlink))
2167 return PTR_ERR(tlink);
2168 tcon = tlink_tcon(tlink);
2169
2170 page1 = alloc_dentry_path();
2171 page2 = alloc_dentry_path();
2172 xid = get_xid();
2173
2174 from_name = build_path_from_dentry(source_dentry, page1);
2175 if (IS_ERR(from_name)) {
2176 rc = PTR_ERR(from_name);
2177 goto cifs_rename_exit;
2178 }
2179
2180 to_name = build_path_from_dentry(target_dentry, page2);
2181 if (IS_ERR(to_name)) {
2182 rc = PTR_ERR(to_name);
2183 goto cifs_rename_exit;
2184 }
2185
2186 cifs_close_deferred_file_under_dentry(tcon, from_name);
2187 if (d_inode(target_dentry) != NULL)
2188 cifs_close_deferred_file_under_dentry(tcon, to_name);
2189
2190 rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
2191 to_name);
2192
2193 if (rc == -EACCES) {
2194 while (retry_count < 3) {
2195 cifs_close_all_deferred_files(tcon);
2196 rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
2197 to_name);
2198 if (rc != -EACCES)
2199 break;
2200 retry_count++;
2201 }
2202 }
2203
2204 /*
2205 * No-replace is the natural behavior for CIFS, so skip unlink hacks.
2206 */
2207 if (flags & RENAME_NOREPLACE)
2208 goto cifs_rename_exit;
2209
2210#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2211 if (rc == -EEXIST && tcon->unix_ext) {
2212 /*
2213 * Are src and dst hardlinks of same inode? We can only tell
2214 * with unix extensions enabled.
2215 */
2216 info_buf_source =
2217 kmalloc_array(2, sizeof(FILE_UNIX_BASIC_INFO),
2218 GFP_KERNEL);
2219 if (info_buf_source == NULL) {
2220 rc = -ENOMEM;
2221 goto cifs_rename_exit;
2222 }
2223
2224 info_buf_target = info_buf_source + 1;
2225 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, from_name,
2226 info_buf_source,
2227 cifs_sb->local_nls,
2228 cifs_remap(cifs_sb));
2229 if (tmprc != 0)
2230 goto unlink_target;
2231
2232 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, to_name,
2233 info_buf_target,
2234 cifs_sb->local_nls,
2235 cifs_remap(cifs_sb));
2236
2237 if (tmprc == 0 && (info_buf_source->UniqueId ==
2238 info_buf_target->UniqueId)) {
2239 /* same file, POSIX says that this is a noop */
2240 rc = 0;
2241 goto cifs_rename_exit;
2242 }
2243 }
2244 /*
2245 * else ... BB we could add the same check for Windows by
2246 * checking the UniqueId via FILE_INTERNAL_INFO
2247 */
2248
2249unlink_target:
2250#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2251
2252 /* Try unlinking the target dentry if it's not negative */
2253 if (d_really_is_positive(target_dentry) && (rc == -EACCES || rc == -EEXIST)) {
2254 if (d_is_dir(target_dentry))
2255 tmprc = cifs_rmdir(target_dir, target_dentry);
2256 else
2257 tmprc = cifs_unlink(target_dir, target_dentry);
2258 if (tmprc)
2259 goto cifs_rename_exit;
2260 rc = cifs_do_rename(xid, source_dentry, from_name,
2261 target_dentry, to_name);
2262 }
2263
2264 /* force revalidate to go get info when needed */
2265 CIFS_I(source_dir)->time = CIFS_I(target_dir)->time = 0;
2266
2267 source_dir->i_ctime = source_dir->i_mtime = target_dir->i_ctime =
2268 target_dir->i_mtime = current_time(source_dir);
2269
2270cifs_rename_exit:
2271 kfree(info_buf_source);
2272 free_dentry_path(page2);
2273 free_dentry_path(page1);
2274 free_xid(xid);
2275 cifs_put_tlink(tlink);
2276 return rc;
2277}
2278
2279static bool
2280cifs_dentry_needs_reval(struct dentry *dentry)
2281{
2282 struct inode *inode = d_inode(dentry);
2283 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
2284 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2285 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
2286 struct cached_fid *cfid = NULL;
2287
2288 if (cifs_i->time == 0)
2289 return true;
2290
2291 if (CIFS_CACHE_READ(cifs_i))
2292 return false;
2293
2294 if (!lookupCacheEnabled)
2295 return true;
2296
2297 if (!open_cached_dir_by_dentry(tcon, dentry->d_parent, &cfid)) {
2298 spin_lock(&cfid->fid_lock);
2299 if (cfid->time && cifs_i->time > cfid->time) {
2300 spin_unlock(&cfid->fid_lock);
2301 close_cached_dir(cfid);
2302 return false;
2303 }
2304 spin_unlock(&cfid->fid_lock);
2305 close_cached_dir(cfid);
2306 }
2307 /*
2308 * depending on inode type, check if attribute caching disabled for
2309 * files or directories
2310 */
2311 if (S_ISDIR(inode->i_mode)) {
2312 if (!cifs_sb->ctx->acdirmax)
2313 return true;
2314 if (!time_in_range(jiffies, cifs_i->time,
2315 cifs_i->time + cifs_sb->ctx->acdirmax))
2316 return true;
2317 } else { /* file */
2318 if (!cifs_sb->ctx->acregmax)
2319 return true;
2320 if (!time_in_range(jiffies, cifs_i->time,
2321 cifs_i->time + cifs_sb->ctx->acregmax))
2322 return true;
2323 }
2324
2325 /* hardlinked files w/ noserverino get "special" treatment */
2326 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
2327 S_ISREG(inode->i_mode) && inode->i_nlink != 1)
2328 return true;
2329
2330 return false;
2331}
2332
2333/*
2334 * Zap the cache. Called when invalid_mapping flag is set.
2335 */
2336int
2337cifs_invalidate_mapping(struct inode *inode)
2338{
2339 int rc = 0;
2340
2341 if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
2342 rc = invalidate_inode_pages2(inode->i_mapping);
2343 if (rc)
2344 cifs_dbg(VFS, "%s: Could not invalidate inode %p\n",
2345 __func__, inode);
2346 }
2347
2348 return rc;
2349}
2350
2351/**
2352 * cifs_wait_bit_killable - helper for functions that are sleeping on bit locks
2353 *
2354 * @key: currently unused
2355 * @mode: the task state to sleep in
2356 */
2357static int
2358cifs_wait_bit_killable(struct wait_bit_key *key, int mode)
2359{
2360 schedule();
2361 if (signal_pending_state(mode, current))
2362 return -ERESTARTSYS;
2363 return 0;
2364}
2365
2366int
2367cifs_revalidate_mapping(struct inode *inode)
2368{
2369 int rc;
2370 unsigned long *flags = &CIFS_I(inode)->flags;
2371 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2372
2373 /* swapfiles are not supposed to be shared */
2374 if (IS_SWAPFILE(inode))
2375 return 0;
2376
2377 rc = wait_on_bit_lock_action(flags, CIFS_INO_LOCK, cifs_wait_bit_killable,
2378 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
2379 if (rc)
2380 return rc;
2381
2382 if (test_and_clear_bit(CIFS_INO_INVALID_MAPPING, flags)) {
2383 /* for cache=singleclient, do not invalidate */
2384 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
2385 goto skip_invalidate;
2386
2387 rc = cifs_invalidate_mapping(inode);
2388 if (rc)
2389 set_bit(CIFS_INO_INVALID_MAPPING, flags);
2390 }
2391
2392skip_invalidate:
2393 clear_bit_unlock(CIFS_INO_LOCK, flags);
2394 smp_mb__after_atomic();
2395 wake_up_bit(flags, CIFS_INO_LOCK);
2396
2397 return rc;
2398}
2399
2400int
2401cifs_zap_mapping(struct inode *inode)
2402{
2403 set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(inode)->flags);
2404 return cifs_revalidate_mapping(inode);
2405}
2406
2407int cifs_revalidate_file_attr(struct file *filp)
2408{
2409 int rc = 0;
2410 struct dentry *dentry = file_dentry(filp);
2411#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2412 struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
2413#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2414
2415 if (!cifs_dentry_needs_reval(dentry))
2416 return rc;
2417
2418#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2419 if (tlink_tcon(cfile->tlink)->unix_ext)
2420 rc = cifs_get_file_info_unix(filp);
2421 else
2422#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2423 rc = cifs_get_file_info(filp);
2424
2425 return rc;
2426}
2427
2428int cifs_revalidate_dentry_attr(struct dentry *dentry)
2429{
2430 unsigned int xid;
2431 int rc = 0;
2432 struct inode *inode = d_inode(dentry);
2433 struct super_block *sb = dentry->d_sb;
2434 const char *full_path;
2435 void *page;
2436 int count = 0;
2437
2438 if (inode == NULL)
2439 return -ENOENT;
2440
2441 if (!cifs_dentry_needs_reval(dentry))
2442 return rc;
2443
2444 xid = get_xid();
2445
2446 page = alloc_dentry_path();
2447 full_path = build_path_from_dentry(dentry, page);
2448 if (IS_ERR(full_path)) {
2449 rc = PTR_ERR(full_path);
2450 goto out;
2451 }
2452
2453 cifs_dbg(FYI, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time %ld jiffies %ld\n",
2454 full_path, inode, inode->i_count.counter,
2455 dentry, cifs_get_time(dentry), jiffies);
2456
2457again:
2458 if (cifs_sb_master_tcon(CIFS_SB(sb))->posix_extensions)
2459 rc = smb311_posix_get_inode_info(&inode, full_path, sb, xid);
2460 else if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
2461 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
2462 else
2463 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
2464 xid, NULL);
2465 if (rc == -EAGAIN && count++ < 10)
2466 goto again;
2467out:
2468 free_dentry_path(page);
2469 free_xid(xid);
2470
2471 return rc;
2472}
2473
2474int cifs_revalidate_file(struct file *filp)
2475{
2476 int rc;
2477 struct inode *inode = file_inode(filp);
2478
2479 rc = cifs_revalidate_file_attr(filp);
2480 if (rc)
2481 return rc;
2482
2483 return cifs_revalidate_mapping(inode);
2484}
2485
2486/* revalidate a dentry's inode attributes */
2487int cifs_revalidate_dentry(struct dentry *dentry)
2488{
2489 int rc;
2490 struct inode *inode = d_inode(dentry);
2491
2492 rc = cifs_revalidate_dentry_attr(dentry);
2493 if (rc)
2494 return rc;
2495
2496 return cifs_revalidate_mapping(inode);
2497}
2498
2499int cifs_getattr(struct user_namespace *mnt_userns, const struct path *path,
2500 struct kstat *stat, u32 request_mask, unsigned int flags)
2501{
2502 struct dentry *dentry = path->dentry;
2503 struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
2504 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
2505 struct inode *inode = d_inode(dentry);
2506 int rc;
2507
2508 if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb))))
2509 return -EIO;
2510
2511 /*
2512 * We need to be sure that all dirty pages are written and the server
2513 * has actual ctime, mtime and file length.
2514 */
2515 if ((request_mask & (STATX_CTIME | STATX_MTIME | STATX_SIZE | STATX_BLOCKS)) &&
2516 !CIFS_CACHE_READ(CIFS_I(inode)) &&
2517 inode->i_mapping && inode->i_mapping->nrpages != 0) {
2518 rc = filemap_fdatawait(inode->i_mapping);
2519 if (rc) {
2520 mapping_set_error(inode->i_mapping, rc);
2521 return rc;
2522 }
2523 }
2524
2525 if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_FORCE_SYNC)
2526 CIFS_I(inode)->time = 0; /* force revalidate */
2527
2528 /*
2529 * If the caller doesn't require syncing, only sync if
2530 * necessary (e.g. due to earlier truncate or setattr
2531 * invalidating the cached metadata)
2532 */
2533 if (((flags & AT_STATX_SYNC_TYPE) != AT_STATX_DONT_SYNC) ||
2534 (CIFS_I(inode)->time == 0)) {
2535 rc = cifs_revalidate_dentry_attr(dentry);
2536 if (rc)
2537 return rc;
2538 }
2539
2540 generic_fillattr(&init_user_ns, inode, stat);
2541 stat->blksize = cifs_sb->ctx->bsize;
2542 stat->ino = CIFS_I(inode)->uniqueid;
2543
2544 /* old CIFS Unix Extensions doesn't return create time */
2545 if (CIFS_I(inode)->createtime) {
2546 stat->result_mask |= STATX_BTIME;
2547 stat->btime =
2548 cifs_NTtimeToUnix(cpu_to_le64(CIFS_I(inode)->createtime));
2549 }
2550
2551 stat->attributes_mask |= (STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED);
2552 if (CIFS_I(inode)->cifsAttrs & FILE_ATTRIBUTE_COMPRESSED)
2553 stat->attributes |= STATX_ATTR_COMPRESSED;
2554 if (CIFS_I(inode)->cifsAttrs & FILE_ATTRIBUTE_ENCRYPTED)
2555 stat->attributes |= STATX_ATTR_ENCRYPTED;
2556
2557 /*
2558 * If on a multiuser mount without unix extensions or cifsacl being
2559 * enabled, and the admin hasn't overridden them, set the ownership
2560 * to the fsuid/fsgid of the current process.
2561 */
2562 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
2563 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
2564 !tcon->unix_ext) {
2565 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
2566 stat->uid = current_fsuid();
2567 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
2568 stat->gid = current_fsgid();
2569 }
2570 return 0;
2571}
2572
2573int cifs_fiemap(struct inode *inode, struct fiemap_extent_info *fei, u64 start,
2574 u64 len)
2575{
2576 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
2577 struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_i->netfs.inode.i_sb);
2578 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
2579 struct TCP_Server_Info *server = tcon->ses->server;
2580 struct cifsFileInfo *cfile;
2581 int rc;
2582
2583 if (unlikely(cifs_forced_shutdown(cifs_sb)))
2584 return -EIO;
2585
2586 /*
2587 * We need to be sure that all dirty pages are written as they
2588 * might fill holes on the server.
2589 */
2590 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
2591 inode->i_mapping->nrpages != 0) {
2592 rc = filemap_fdatawait(inode->i_mapping);
2593 if (rc) {
2594 mapping_set_error(inode->i_mapping, rc);
2595 return rc;
2596 }
2597 }
2598
2599 cfile = find_readable_file(cifs_i, false);
2600 if (cfile == NULL)
2601 return -EINVAL;
2602
2603 if (server->ops->fiemap) {
2604 rc = server->ops->fiemap(tcon, cfile, fei, start, len);
2605 cifsFileInfo_put(cfile);
2606 return rc;
2607 }
2608
2609 cifsFileInfo_put(cfile);
2610 return -ENOTSUPP;
2611}
2612
2613int cifs_truncate_page(struct address_space *mapping, loff_t from)
2614{
2615 pgoff_t index = from >> PAGE_SHIFT;
2616 unsigned offset = from & (PAGE_SIZE - 1);
2617 struct page *page;
2618 int rc = 0;
2619
2620 page = grab_cache_page(mapping, index);
2621 if (!page)
2622 return -ENOMEM;
2623
2624 zero_user_segment(page, offset, PAGE_SIZE);
2625 unlock_page(page);
2626 put_page(page);
2627 return rc;
2628}
2629
2630void cifs_setsize(struct inode *inode, loff_t offset)
2631{
2632 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
2633
2634 spin_lock(&inode->i_lock);
2635 i_size_write(inode, offset);
2636 spin_unlock(&inode->i_lock);
2637
2638 /* Cached inode must be refreshed on truncate */
2639 cifs_i->time = 0;
2640 truncate_pagecache(inode, offset);
2641}
2642
2643static int
2644cifs_set_file_size(struct inode *inode, struct iattr *attrs,
2645 unsigned int xid, const char *full_path)
2646{
2647 int rc;
2648 struct cifsFileInfo *open_file;
2649 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2650 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2651 struct tcon_link *tlink = NULL;
2652 struct cifs_tcon *tcon = NULL;
2653 struct TCP_Server_Info *server;
2654
2655 /*
2656 * To avoid spurious oplock breaks from server, in the case of
2657 * inodes that we already have open, avoid doing path based
2658 * setting of file size if we can do it by handle.
2659 * This keeps our caching token (oplock) and avoids timeouts
2660 * when the local oplock break takes longer to flush
2661 * writebehind data than the SMB timeout for the SetPathInfo
2662 * request would allow
2663 */
2664 open_file = find_writable_file(cifsInode, FIND_WR_FSUID_ONLY);
2665 if (open_file) {
2666 tcon = tlink_tcon(open_file->tlink);
2667 server = tcon->ses->server;
2668 if (server->ops->set_file_size)
2669 rc = server->ops->set_file_size(xid, tcon, open_file,
2670 attrs->ia_size, false);
2671 else
2672 rc = -ENOSYS;
2673 cifsFileInfo_put(open_file);
2674 cifs_dbg(FYI, "SetFSize for attrs rc = %d\n", rc);
2675 } else
2676 rc = -EINVAL;
2677
2678 if (!rc)
2679 goto set_size_out;
2680
2681 if (tcon == NULL) {
2682 tlink = cifs_sb_tlink(cifs_sb);
2683 if (IS_ERR(tlink))
2684 return PTR_ERR(tlink);
2685 tcon = tlink_tcon(tlink);
2686 server = tcon->ses->server;
2687 }
2688
2689 /*
2690 * Set file size by pathname rather than by handle either because no
2691 * valid, writeable file handle for it was found or because there was
2692 * an error setting it by handle.
2693 */
2694 if (server->ops->set_path_size)
2695 rc = server->ops->set_path_size(xid, tcon, full_path,
2696 attrs->ia_size, cifs_sb, false);
2697 else
2698 rc = -ENOSYS;
2699 cifs_dbg(FYI, "SetEOF by path (setattrs) rc = %d\n", rc);
2700
2701 if (tlink)
2702 cifs_put_tlink(tlink);
2703
2704set_size_out:
2705 if (rc == 0) {
2706 cifsInode->server_eof = attrs->ia_size;
2707 cifs_setsize(inode, attrs->ia_size);
2708 /*
2709 * i_blocks is not related to (i_size / i_blksize), but instead
2710 * 512 byte (2**9) size is required for calculating num blocks.
2711 * Until we can query the server for actual allocation size,
2712 * this is best estimate we have for blocks allocated for a file
2713 * Number of blocks must be rounded up so size 1 is not 0 blocks
2714 */
2715 inode->i_blocks = (512 - 1 + attrs->ia_size) >> 9;
2716
2717 /*
2718 * The man page of truncate says if the size changed,
2719 * then the st_ctime and st_mtime fields for the file
2720 * are updated.
2721 */
2722 attrs->ia_ctime = attrs->ia_mtime = current_time(inode);
2723 attrs->ia_valid |= ATTR_CTIME | ATTR_MTIME;
2724
2725 cifs_truncate_page(inode->i_mapping, inode->i_size);
2726 }
2727
2728 return rc;
2729}
2730
2731#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2732static int
2733cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
2734{
2735 int rc;
2736 unsigned int xid;
2737 const char *full_path;
2738 void *page = alloc_dentry_path();
2739 struct inode *inode = d_inode(direntry);
2740 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2741 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2742 struct tcon_link *tlink;
2743 struct cifs_tcon *pTcon;
2744 struct cifs_unix_set_info_args *args = NULL;
2745 struct cifsFileInfo *open_file;
2746
2747 cifs_dbg(FYI, "setattr_unix on file %pd attrs->ia_valid=0x%x\n",
2748 direntry, attrs->ia_valid);
2749
2750 xid = get_xid();
2751
2752 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2753 attrs->ia_valid |= ATTR_FORCE;
2754
2755 rc = setattr_prepare(&init_user_ns, direntry, attrs);
2756 if (rc < 0)
2757 goto out;
2758
2759 full_path = build_path_from_dentry(direntry, page);
2760 if (IS_ERR(full_path)) {
2761 rc = PTR_ERR(full_path);
2762 goto out;
2763 }
2764
2765 /*
2766 * Attempt to flush data before changing attributes. We need to do
2767 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2768 * ownership or mode then we may also need to do this. Here, we take
2769 * the safe way out and just do the flush on all setattr requests. If
2770 * the flush returns error, store it to report later and continue.
2771 *
2772 * BB: This should be smarter. Why bother flushing pages that
2773 * will be truncated anyway? Also, should we error out here if
2774 * the flush returns error?
2775 */
2776 rc = filemap_write_and_wait(inode->i_mapping);
2777 if (is_interrupt_error(rc)) {
2778 rc = -ERESTARTSYS;
2779 goto out;
2780 }
2781
2782 mapping_set_error(inode->i_mapping, rc);
2783 rc = 0;
2784
2785 if (attrs->ia_valid & ATTR_SIZE) {
2786 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2787 if (rc != 0)
2788 goto out;
2789 }
2790
2791 /* skip mode change if it's just for clearing setuid/setgid */
2792 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2793 attrs->ia_valid &= ~ATTR_MODE;
2794
2795 args = kmalloc(sizeof(*args), GFP_KERNEL);
2796 if (args == NULL) {
2797 rc = -ENOMEM;
2798 goto out;
2799 }
2800
2801 /* set up the struct */
2802 if (attrs->ia_valid & ATTR_MODE)
2803 args->mode = attrs->ia_mode;
2804 else
2805 args->mode = NO_CHANGE_64;
2806
2807 if (attrs->ia_valid & ATTR_UID)
2808 args->uid = attrs->ia_uid;
2809 else
2810 args->uid = INVALID_UID; /* no change */
2811
2812 if (attrs->ia_valid & ATTR_GID)
2813 args->gid = attrs->ia_gid;
2814 else
2815 args->gid = INVALID_GID; /* no change */
2816
2817 if (attrs->ia_valid & ATTR_ATIME)
2818 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
2819 else
2820 args->atime = NO_CHANGE_64;
2821
2822 if (attrs->ia_valid & ATTR_MTIME)
2823 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
2824 else
2825 args->mtime = NO_CHANGE_64;
2826
2827 if (attrs->ia_valid & ATTR_CTIME)
2828 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
2829 else
2830 args->ctime = NO_CHANGE_64;
2831
2832 args->device = 0;
2833 open_file = find_writable_file(cifsInode, FIND_WR_FSUID_ONLY);
2834 if (open_file) {
2835 u16 nfid = open_file->fid.netfid;
2836 u32 npid = open_file->pid;
2837 pTcon = tlink_tcon(open_file->tlink);
2838 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
2839 cifsFileInfo_put(open_file);
2840 } else {
2841 tlink = cifs_sb_tlink(cifs_sb);
2842 if (IS_ERR(tlink)) {
2843 rc = PTR_ERR(tlink);
2844 goto out;
2845 }
2846 pTcon = tlink_tcon(tlink);
2847 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
2848 cifs_sb->local_nls,
2849 cifs_remap(cifs_sb));
2850 cifs_put_tlink(tlink);
2851 }
2852
2853 if (rc)
2854 goto out;
2855
2856 if ((attrs->ia_valid & ATTR_SIZE) &&
2857 attrs->ia_size != i_size_read(inode)) {
2858 truncate_setsize(inode, attrs->ia_size);
2859 fscache_resize_cookie(cifs_inode_cookie(inode), attrs->ia_size);
2860 }
2861
2862 setattr_copy(&init_user_ns, inode, attrs);
2863 mark_inode_dirty(inode);
2864
2865 /* force revalidate when any of these times are set since some
2866 of the fs types (eg ext3, fat) do not have fine enough
2867 time granularity to match protocol, and we do not have a
2868 a way (yet) to query the server fs's time granularity (and
2869 whether it rounds times down).
2870 */
2871 if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
2872 cifsInode->time = 0;
2873out:
2874 kfree(args);
2875 free_dentry_path(page);
2876 free_xid(xid);
2877 return rc;
2878}
2879#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2880
2881static int
2882cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
2883{
2884 unsigned int xid;
2885 kuid_t uid = INVALID_UID;
2886 kgid_t gid = INVALID_GID;
2887 struct inode *inode = d_inode(direntry);
2888 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2889 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2890 struct cifsFileInfo *wfile;
2891 struct cifs_tcon *tcon;
2892 const char *full_path;
2893 void *page = alloc_dentry_path();
2894 int rc = -EACCES;
2895 __u32 dosattr = 0;
2896 __u64 mode = NO_CHANGE_64;
2897
2898 xid = get_xid();
2899
2900 cifs_dbg(FYI, "setattr on file %pd attrs->ia_valid 0x%x\n",
2901 direntry, attrs->ia_valid);
2902
2903 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2904 attrs->ia_valid |= ATTR_FORCE;
2905
2906 rc = setattr_prepare(&init_user_ns, direntry, attrs);
2907 if (rc < 0)
2908 goto cifs_setattr_exit;
2909
2910 full_path = build_path_from_dentry(direntry, page);
2911 if (IS_ERR(full_path)) {
2912 rc = PTR_ERR(full_path);
2913 goto cifs_setattr_exit;
2914 }
2915
2916 /*
2917 * Attempt to flush data before changing attributes. We need to do
2918 * this for ATTR_SIZE and ATTR_MTIME. If the flush of the data
2919 * returns error, store it to report later and continue.
2920 *
2921 * BB: This should be smarter. Why bother flushing pages that
2922 * will be truncated anyway? Also, should we error out here if
2923 * the flush returns error? Do we need to check for ATTR_MTIME_SET flag?
2924 */
2925 if (attrs->ia_valid & (ATTR_MTIME | ATTR_SIZE | ATTR_CTIME)) {
2926 rc = filemap_write_and_wait(inode->i_mapping);
2927 if (is_interrupt_error(rc)) {
2928 rc = -ERESTARTSYS;
2929 goto cifs_setattr_exit;
2930 }
2931 mapping_set_error(inode->i_mapping, rc);
2932 }
2933
2934 rc = 0;
2935
2936 if ((attrs->ia_valid & ATTR_MTIME) &&
2937 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) {
2938 rc = cifs_get_writable_file(cifsInode, FIND_WR_ANY, &wfile);
2939 if (!rc) {
2940 tcon = tlink_tcon(wfile->tlink);
2941 rc = tcon->ses->server->ops->flush(xid, tcon, &wfile->fid);
2942 cifsFileInfo_put(wfile);
2943 if (rc)
2944 goto cifs_setattr_exit;
2945 } else if (rc != -EBADF)
2946 goto cifs_setattr_exit;
2947 else
2948 rc = 0;
2949 }
2950
2951 if (attrs->ia_valid & ATTR_SIZE) {
2952 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2953 if (rc != 0)
2954 goto cifs_setattr_exit;
2955 }
2956
2957 if (attrs->ia_valid & ATTR_UID)
2958 uid = attrs->ia_uid;
2959
2960 if (attrs->ia_valid & ATTR_GID)
2961 gid = attrs->ia_gid;
2962
2963 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) ||
2964 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)) {
2965 if (uid_valid(uid) || gid_valid(gid)) {
2966 mode = NO_CHANGE_64;
2967 rc = id_mode_to_cifs_acl(inode, full_path, &mode,
2968 uid, gid);
2969 if (rc) {
2970 cifs_dbg(FYI, "%s: Setting id failed with error: %d\n",
2971 __func__, rc);
2972 goto cifs_setattr_exit;
2973 }
2974 }
2975 } else
2976 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
2977 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
2978
2979 /* skip mode change if it's just for clearing setuid/setgid */
2980 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2981 attrs->ia_valid &= ~ATTR_MODE;
2982
2983 if (attrs->ia_valid & ATTR_MODE) {
2984 mode = attrs->ia_mode;
2985 rc = 0;
2986 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) ||
2987 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)) {
2988 rc = id_mode_to_cifs_acl(inode, full_path, &mode,
2989 INVALID_UID, INVALID_GID);
2990 if (rc) {
2991 cifs_dbg(FYI, "%s: Setting ACL failed with error: %d\n",
2992 __func__, rc);
2993 goto cifs_setattr_exit;
2994 }
2995
2996 /*
2997 * In case of CIFS_MOUNT_CIFS_ACL, we cannot support all modes.
2998 * Pick up the actual mode bits that were set.
2999 */
3000 if (mode != attrs->ia_mode)
3001 attrs->ia_mode = mode;
3002 } else
3003 if (((mode & S_IWUGO) == 0) &&
3004 (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
3005
3006 dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
3007
3008 /* fix up mode if we're not using dynperm */
3009 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
3010 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
3011 } else if ((mode & S_IWUGO) &&
3012 (cifsInode->cifsAttrs & ATTR_READONLY)) {
3013
3014 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
3015 /* Attributes of 0 are ignored */
3016 if (dosattr == 0)
3017 dosattr |= ATTR_NORMAL;
3018
3019 /* reset local inode permissions to normal */
3020 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
3021 attrs->ia_mode &= ~(S_IALLUGO);
3022 if (S_ISDIR(inode->i_mode))
3023 attrs->ia_mode |=
3024 cifs_sb->ctx->dir_mode;
3025 else
3026 attrs->ia_mode |=
3027 cifs_sb->ctx->file_mode;
3028 }
3029 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
3030 /* ignore mode change - ATTR_READONLY hasn't changed */
3031 attrs->ia_valid &= ~ATTR_MODE;
3032 }
3033 }
3034
3035 if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
3036 ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
3037 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
3038 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
3039
3040 /* Even if error on time set, no sense failing the call if
3041 the server would set the time to a reasonable value anyway,
3042 and this check ensures that we are not being called from
3043 sys_utimes in which case we ought to fail the call back to
3044 the user when the server rejects the call */
3045 if ((rc) && (attrs->ia_valid &
3046 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
3047 rc = 0;
3048 }
3049
3050 /* do not need local check to inode_check_ok since the server does
3051 that */
3052 if (rc)
3053 goto cifs_setattr_exit;
3054
3055 if ((attrs->ia_valid & ATTR_SIZE) &&
3056 attrs->ia_size != i_size_read(inode)) {
3057 truncate_setsize(inode, attrs->ia_size);
3058 fscache_resize_cookie(cifs_inode_cookie(inode), attrs->ia_size);
3059 }
3060
3061 setattr_copy(&init_user_ns, inode, attrs);
3062 mark_inode_dirty(inode);
3063
3064cifs_setattr_exit:
3065 free_xid(xid);
3066 free_dentry_path(page);
3067 return rc;
3068}
3069
3070int
3071cifs_setattr(struct user_namespace *mnt_userns, struct dentry *direntry,
3072 struct iattr *attrs)
3073{
3074 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
3075 int rc, retries = 0;
3076#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3077 struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
3078#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3079
3080 if (unlikely(cifs_forced_shutdown(cifs_sb)))
3081 return -EIO;
3082
3083 do {
3084#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3085 if (pTcon->unix_ext)
3086 rc = cifs_setattr_unix(direntry, attrs);
3087 else
3088#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3089 rc = cifs_setattr_nounix(direntry, attrs);
3090 retries++;
3091 } while (is_retryable_error(rc) && retries < 2);
3092
3093 /* BB: add cifs_setattr_legacy for really old servers */
3094 return rc;
3095}
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
40static 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 */
94static void
95cifs_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 */
132static void
133cifs_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 */
156void
157cifs_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
213void
214cifs_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. */
225void
226cifs_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 */
317static void
318cifs_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
335static int
336cifs_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
361int 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
427cgiiu_exit:
428 return rc;
429}
430
431static int
432cifs_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 */
547static 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 */
589static void
590cifs_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
659static int
660cifs_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);
705cgfi_exit:
706 free_xid(xid);
707 return rc;
708}
709
710/* Simple function to return a 64 bit hash of string. Rarely called */
711static __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
722int
723cifs_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_dbg(FYI, "No need to revalidate cached inode sizes\n");
751 goto cgii_exit;
752 }
753 }
754
755 /* if inode info is not passed, get it from server */
756 if (data == NULL) {
757 if (!server->ops->query_path_info) {
758 rc = -ENOSYS;
759 goto cgii_exit;
760 }
761 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
762 if (buf == NULL) {
763 rc = -ENOMEM;
764 goto cgii_exit;
765 }
766 data = (FILE_ALL_INFO *)buf;
767 rc = server->ops->query_path_info(xid, tcon, cifs_sb, full_path,
768 data, &adjust_tz, &symlink);
769 }
770
771 if (!rc) {
772 cifs_all_info_to_fattr(&fattr, data, sb, adjust_tz,
773 symlink);
774 } else if (rc == -EREMOTE) {
775 cifs_create_dfs_fattr(&fattr, sb);
776 rc = 0;
777 } else if (rc == -EACCES && backup_cred(cifs_sb)) {
778 srchinf = kzalloc(sizeof(struct cifs_search_info),
779 GFP_KERNEL);
780 if (srchinf == NULL) {
781 rc = -ENOMEM;
782 goto cgii_exit;
783 }
784
785 srchinf->endOfSearch = false;
786 srchinf->info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
787
788 srchflgs = CIFS_SEARCH_CLOSE_ALWAYS |
789 CIFS_SEARCH_CLOSE_AT_END |
790 CIFS_SEARCH_BACKUP_SEARCH;
791
792 rc = CIFSFindFirst(xid, tcon, full_path,
793 cifs_sb, NULL, srchflgs, srchinf, false);
794 if (!rc) {
795 data =
796 (FILE_ALL_INFO *)srchinf->srch_entries_start;
797
798 cifs_dir_info_to_fattr(&fattr,
799 (FILE_DIRECTORY_INFO *)data, cifs_sb);
800 fattr.cf_uniqueid = le64_to_cpu(
801 ((SEARCH_ID_FULL_DIR_INFO *)data)->UniqueId);
802 validinum = true;
803
804 cifs_buf_release(srchinf->ntwrk_buf_start);
805 }
806 kfree(srchinf);
807 if (rc)
808 goto cgii_exit;
809 } else
810 goto cgii_exit;
811
812 /*
813 * If an inode wasn't passed in, then get the inode number
814 *
815 * Is an i_ino of zero legal? Can we use that to check if the server
816 * supports returning inode numbers? Are there other sanity checks we
817 * can use to ensure that the server is really filling in that field?
818 */
819 if (*inode == NULL) {
820 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
821 if (validinum == false) {
822 if (server->ops->get_srv_inum)
823 tmprc = server->ops->get_srv_inum(xid,
824 tcon, cifs_sb, full_path,
825 &fattr.cf_uniqueid, data);
826 if (tmprc) {
827 cifs_dbg(FYI, "GetSrvInodeNum rc %d\n",
828 tmprc);
829 fattr.cf_uniqueid = iunique(sb, ROOT_I);
830 cifs_autodisable_serverino(cifs_sb);
831 } else if ((fattr.cf_uniqueid == 0) &&
832 strlen(full_path) == 0) {
833 /* some servers ret bad root ino ie 0 */
834 cifs_dbg(FYI, "Invalid (0) inodenum\n");
835 fattr.cf_flags |=
836 CIFS_FATTR_FAKE_ROOT_INO;
837 fattr.cf_uniqueid =
838 simple_hashstr(tcon->treeName);
839 }
840 }
841 } else
842 fattr.cf_uniqueid = iunique(sb, ROOT_I);
843 } else {
844 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
845 validinum == false && server->ops->get_srv_inum) {
846 /*
847 * Pass a NULL tcon to ensure we don't make a round
848 * trip to the server. This only works for SMB2+.
849 */
850 tmprc = server->ops->get_srv_inum(xid,
851 NULL, cifs_sb, full_path,
852 &fattr.cf_uniqueid, data);
853 if (tmprc)
854 fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
855 else if ((fattr.cf_uniqueid == 0) &&
856 strlen(full_path) == 0) {
857 /*
858 * Reuse existing root inode num since
859 * inum zero for root causes ls of . and .. to
860 * not be returned
861 */
862 cifs_dbg(FYI, "Srv ret 0 inode num for root\n");
863 fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
864 }
865 } else
866 fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
867 }
868
869 /* query for SFU type info if supported and needed */
870 if (fattr.cf_cifsattrs & ATTR_SYSTEM &&
871 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
872 tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid);
873 if (tmprc)
874 cifs_dbg(FYI, "cifs_sfu_type failed: %d\n", tmprc);
875 }
876
877#ifdef CONFIG_CIFS_ACL
878 /* fill in 0777 bits from ACL */
879 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
880 rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, full_path, fid);
881 if (rc) {
882 cifs_dbg(FYI, "%s: Getting ACL failed with error: %d\n",
883 __func__, rc);
884 goto cgii_exit;
885 }
886 }
887#endif /* CONFIG_CIFS_ACL */
888
889 /* fill in remaining high mode bits e.g. SUID, VTX */
890 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
891 cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
892
893 /* check for Minshall+French symlinks */
894 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
895 tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
896 full_path);
897 if (tmprc)
898 cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
899 }
900
901 if (!*inode) {
902 *inode = cifs_iget(sb, &fattr);
903 if (!*inode)
904 rc = -ENOMEM;
905 } else {
906 /* we already have inode, update it */
907
908 /* if uniqueid is different, return error */
909 if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
910 CIFS_I(*inode)->uniqueid != fattr.cf_uniqueid)) {
911 rc = -ESTALE;
912 goto cgii_exit;
913 }
914
915 /* if filetype is different, return error */
916 if (unlikely(((*inode)->i_mode & S_IFMT) !=
917 (fattr.cf_mode & S_IFMT))) {
918 rc = -ESTALE;
919 goto cgii_exit;
920 }
921
922 cifs_fattr_to_inode(*inode, &fattr);
923 }
924
925cgii_exit:
926 if ((*inode) && ((*inode)->i_ino == 0))
927 cifs_dbg(FYI, "inode number of zero returned\n");
928
929 kfree(buf);
930 cifs_put_tlink(tlink);
931 return rc;
932}
933
934static const struct inode_operations cifs_ipc_inode_ops = {
935 .lookup = cifs_lookup,
936};
937
938static int
939cifs_find_inode(struct inode *inode, void *opaque)
940{
941 struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
942
943 /* don't match inode with different uniqueid */
944 if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
945 return 0;
946
947 /* use createtime like an i_generation field */
948 if (CIFS_I(inode)->createtime != fattr->cf_createtime)
949 return 0;
950
951 /* don't match inode of different type */
952 if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT))
953 return 0;
954
955 /* if it's not a directory or has no dentries, then flag it */
956 if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry))
957 fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
958
959 return 1;
960}
961
962static int
963cifs_init_inode(struct inode *inode, void *opaque)
964{
965 struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
966
967 CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
968 CIFS_I(inode)->createtime = fattr->cf_createtime;
969 return 0;
970}
971
972/*
973 * walk dentry list for an inode and report whether it has aliases that
974 * are hashed. We use this to determine if a directory inode can actually
975 * be used.
976 */
977static bool
978inode_has_hashed_dentries(struct inode *inode)
979{
980 struct dentry *dentry;
981
982 spin_lock(&inode->i_lock);
983 hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) {
984 if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
985 spin_unlock(&inode->i_lock);
986 return true;
987 }
988 }
989 spin_unlock(&inode->i_lock);
990 return false;
991}
992
993/* Given fattrs, get a corresponding inode */
994struct inode *
995cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
996{
997 unsigned long hash;
998 struct inode *inode;
999
1000retry_iget5_locked:
1001 cifs_dbg(FYI, "looking for uniqueid=%llu\n", fattr->cf_uniqueid);
1002
1003 /* hash down to 32-bits on 32-bit arch */
1004 hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
1005
1006 inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
1007 if (inode) {
1008 /* was there a potentially problematic inode collision? */
1009 if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
1010 fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
1011
1012 if (inode_has_hashed_dentries(inode)) {
1013 cifs_autodisable_serverino(CIFS_SB(sb));
1014 iput(inode);
1015 fattr->cf_uniqueid = iunique(sb, ROOT_I);
1016 goto retry_iget5_locked;
1017 }
1018 }
1019
1020 cifs_fattr_to_inode(inode, fattr);
1021 if (sb->s_flags & SB_NOATIME)
1022 inode->i_flags |= S_NOATIME | S_NOCMTIME;
1023 if (inode->i_state & I_NEW) {
1024 inode->i_ino = hash;
1025#ifdef CONFIG_CIFS_FSCACHE
1026 /* initialize per-inode cache cookie pointer */
1027 CIFS_I(inode)->fscache = NULL;
1028#endif
1029 unlock_new_inode(inode);
1030 }
1031 }
1032
1033 return inode;
1034}
1035
1036/* gets root inode */
1037struct inode *cifs_root_iget(struct super_block *sb)
1038{
1039 unsigned int xid;
1040 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1041 struct inode *inode = NULL;
1042 long rc;
1043 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
1044 char *path = NULL;
1045 int len;
1046
1047 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
1048 && cifs_sb->prepath) {
1049 len = strlen(cifs_sb->prepath);
1050 path = kzalloc(len + 2 /* leading sep + null */, GFP_KERNEL);
1051 if (path == NULL)
1052 return ERR_PTR(-ENOMEM);
1053 path[0] = '/';
1054 memcpy(path+1, cifs_sb->prepath, len);
1055 } else {
1056 path = kstrdup("", GFP_KERNEL);
1057 if (path == NULL)
1058 return ERR_PTR(-ENOMEM);
1059 }
1060
1061 xid = get_xid();
1062 if (tcon->unix_ext) {
1063 rc = cifs_get_inode_info_unix(&inode, path, sb, xid);
1064 /* some servers mistakenly claim POSIX support */
1065 if (rc != -EOPNOTSUPP)
1066 goto iget_no_retry;
1067 cifs_dbg(VFS, "server does not support POSIX extensions");
1068 tcon->unix_ext = false;
1069 }
1070
1071 convert_delimiter(path, CIFS_DIR_SEP(cifs_sb));
1072 rc = cifs_get_inode_info(&inode, path, NULL, sb, xid, NULL);
1073
1074iget_no_retry:
1075 if (!inode) {
1076 inode = ERR_PTR(rc);
1077 goto out;
1078 }
1079
1080#ifdef CONFIG_CIFS_FSCACHE
1081 /* populate tcon->resource_id */
1082 tcon->resource_id = CIFS_I(inode)->uniqueid;
1083#endif
1084
1085 if (rc && tcon->pipe) {
1086 cifs_dbg(FYI, "ipc connection - fake read inode\n");
1087 spin_lock(&inode->i_lock);
1088 inode->i_mode |= S_IFDIR;
1089 set_nlink(inode, 2);
1090 inode->i_op = &cifs_ipc_inode_ops;
1091 inode->i_fop = &simple_dir_operations;
1092 inode->i_uid = cifs_sb->mnt_uid;
1093 inode->i_gid = cifs_sb->mnt_gid;
1094 spin_unlock(&inode->i_lock);
1095 } else if (rc) {
1096 iget_failed(inode);
1097 inode = ERR_PTR(rc);
1098 }
1099
1100out:
1101 kfree(path);
1102 free_xid(xid);
1103 return inode;
1104}
1105
1106int
1107cifs_set_file_info(struct inode *inode, struct iattr *attrs, unsigned int xid,
1108 char *full_path, __u32 dosattr)
1109{
1110 bool set_time = false;
1111 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1112 struct TCP_Server_Info *server;
1113 FILE_BASIC_INFO info_buf;
1114
1115 if (attrs == NULL)
1116 return -EINVAL;
1117
1118 server = cifs_sb_master_tcon(cifs_sb)->ses->server;
1119 if (!server->ops->set_file_info)
1120 return -ENOSYS;
1121
1122 if (attrs->ia_valid & ATTR_ATIME) {
1123 set_time = true;
1124 info_buf.LastAccessTime =
1125 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1126 } else
1127 info_buf.LastAccessTime = 0;
1128
1129 if (attrs->ia_valid & ATTR_MTIME) {
1130 set_time = true;
1131 info_buf.LastWriteTime =
1132 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1133 } else
1134 info_buf.LastWriteTime = 0;
1135
1136 /*
1137 * Samba throws this field away, but windows may actually use it.
1138 * Do not set ctime unless other time stamps are changed explicitly
1139 * (i.e. by utimes()) since we would then have a mix of client and
1140 * server times.
1141 */
1142 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1143 cifs_dbg(FYI, "CIFS - CTIME changed\n");
1144 info_buf.ChangeTime =
1145 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1146 } else
1147 info_buf.ChangeTime = 0;
1148
1149 info_buf.CreationTime = 0; /* don't change */
1150 info_buf.Attributes = cpu_to_le32(dosattr);
1151
1152 return server->ops->set_file_info(inode, full_path, &info_buf, xid);
1153}
1154
1155/*
1156 * Open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
1157 * and rename it to a random name that hopefully won't conflict with
1158 * anything else.
1159 */
1160int
1161cifs_rename_pending_delete(const char *full_path, struct dentry *dentry,
1162 const unsigned int xid)
1163{
1164 int oplock = 0;
1165 int rc;
1166 struct cifs_fid fid;
1167 struct cifs_open_parms oparms;
1168 struct inode *inode = d_inode(dentry);
1169 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1170 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1171 struct tcon_link *tlink;
1172 struct cifs_tcon *tcon;
1173 __u32 dosattr, origattr;
1174 FILE_BASIC_INFO *info_buf = NULL;
1175
1176 tlink = cifs_sb_tlink(cifs_sb);
1177 if (IS_ERR(tlink))
1178 return PTR_ERR(tlink);
1179 tcon = tlink_tcon(tlink);
1180
1181 /*
1182 * We cannot rename the file if the server doesn't support
1183 * CAP_INFOLEVEL_PASSTHRU
1184 */
1185 if (!(tcon->ses->capabilities & CAP_INFOLEVEL_PASSTHRU)) {
1186 rc = -EBUSY;
1187 goto out;
1188 }
1189
1190 oparms.tcon = tcon;
1191 oparms.cifs_sb = cifs_sb;
1192 oparms.desired_access = DELETE | FILE_WRITE_ATTRIBUTES;
1193 oparms.create_options = CREATE_NOT_DIR;
1194 oparms.disposition = FILE_OPEN;
1195 oparms.path = full_path;
1196 oparms.fid = &fid;
1197 oparms.reconnect = false;
1198
1199 rc = CIFS_open(xid, &oparms, &oplock, NULL);
1200 if (rc != 0)
1201 goto out;
1202
1203 origattr = cifsInode->cifsAttrs;
1204 if (origattr == 0)
1205 origattr |= ATTR_NORMAL;
1206
1207 dosattr = origattr & ~ATTR_READONLY;
1208 if (dosattr == 0)
1209 dosattr |= ATTR_NORMAL;
1210 dosattr |= ATTR_HIDDEN;
1211
1212 /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
1213 if (dosattr != origattr) {
1214 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
1215 if (info_buf == NULL) {
1216 rc = -ENOMEM;
1217 goto out_close;
1218 }
1219 info_buf->Attributes = cpu_to_le32(dosattr);
1220 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid,
1221 current->tgid);
1222 /* although we would like to mark the file hidden
1223 if that fails we will still try to rename it */
1224 if (!rc)
1225 cifsInode->cifsAttrs = dosattr;
1226 else
1227 dosattr = origattr; /* since not able to change them */
1228 }
1229
1230 /* rename the file */
1231 rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, NULL,
1232 cifs_sb->local_nls,
1233 cifs_remap(cifs_sb));
1234 if (rc != 0) {
1235 rc = -EBUSY;
1236 goto undo_setattr;
1237 }
1238
1239 /* try to set DELETE_ON_CLOSE */
1240 if (!test_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags)) {
1241 rc = CIFSSMBSetFileDisposition(xid, tcon, true, fid.netfid,
1242 current->tgid);
1243 /*
1244 * some samba versions return -ENOENT when we try to set the
1245 * file disposition here. Likely a samba bug, but work around
1246 * it for now. This means that some cifsXXX files may hang
1247 * around after they shouldn't.
1248 *
1249 * BB: remove this hack after more servers have the fix
1250 */
1251 if (rc == -ENOENT)
1252 rc = 0;
1253 else if (rc != 0) {
1254 rc = -EBUSY;
1255 goto undo_rename;
1256 }
1257 set_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags);
1258 }
1259
1260out_close:
1261 CIFSSMBClose(xid, tcon, fid.netfid);
1262out:
1263 kfree(info_buf);
1264 cifs_put_tlink(tlink);
1265 return rc;
1266
1267 /*
1268 * reset everything back to the original state. Don't bother
1269 * dealing with errors here since we can't do anything about
1270 * them anyway.
1271 */
1272undo_rename:
1273 CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, dentry->d_name.name,
1274 cifs_sb->local_nls, cifs_remap(cifs_sb));
1275undo_setattr:
1276 if (dosattr != origattr) {
1277 info_buf->Attributes = cpu_to_le32(origattr);
1278 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid,
1279 current->tgid))
1280 cifsInode->cifsAttrs = origattr;
1281 }
1282
1283 goto out_close;
1284}
1285
1286/* copied from fs/nfs/dir.c with small changes */
1287static void
1288cifs_drop_nlink(struct inode *inode)
1289{
1290 spin_lock(&inode->i_lock);
1291 if (inode->i_nlink > 0)
1292 drop_nlink(inode);
1293 spin_unlock(&inode->i_lock);
1294}
1295
1296/*
1297 * If d_inode(dentry) is null (usually meaning the cached dentry
1298 * is a negative dentry) then we would attempt a standard SMB delete, but
1299 * if that fails we can not attempt the fall back mechanisms on EACCESS
1300 * but will return the EACCESS to the caller. Note that the VFS does not call
1301 * unlink on negative dentries currently.
1302 */
1303int cifs_unlink(struct inode *dir, struct dentry *dentry)
1304{
1305 int rc = 0;
1306 unsigned int xid;
1307 char *full_path = NULL;
1308 struct inode *inode = d_inode(dentry);
1309 struct cifsInodeInfo *cifs_inode;
1310 struct super_block *sb = dir->i_sb;
1311 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1312 struct tcon_link *tlink;
1313 struct cifs_tcon *tcon;
1314 struct TCP_Server_Info *server;
1315 struct iattr *attrs = NULL;
1316 __u32 dosattr = 0, origattr = 0;
1317
1318 cifs_dbg(FYI, "cifs_unlink, dir=0x%p, dentry=0x%p\n", dir, dentry);
1319
1320 tlink = cifs_sb_tlink(cifs_sb);
1321 if (IS_ERR(tlink))
1322 return PTR_ERR(tlink);
1323 tcon = tlink_tcon(tlink);
1324 server = tcon->ses->server;
1325
1326 xid = get_xid();
1327
1328 /* Unlink can be called from rename so we can not take the
1329 * sb->s_vfs_rename_mutex here */
1330 full_path = build_path_from_dentry(dentry);
1331 if (full_path == NULL) {
1332 rc = -ENOMEM;
1333 goto unlink_out;
1334 }
1335
1336 if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1337 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1338 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
1339 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
1340 cifs_remap(cifs_sb));
1341 cifs_dbg(FYI, "posix del rc %d\n", rc);
1342 if ((rc == 0) || (rc == -ENOENT))
1343 goto psx_del_no_retry;
1344 }
1345
1346retry_std_delete:
1347 if (!server->ops->unlink) {
1348 rc = -ENOSYS;
1349 goto psx_del_no_retry;
1350 }
1351
1352 rc = server->ops->unlink(xid, tcon, full_path, cifs_sb);
1353
1354psx_del_no_retry:
1355 if (!rc) {
1356 if (inode)
1357 cifs_drop_nlink(inode);
1358 } else if (rc == -ENOENT) {
1359 d_drop(dentry);
1360 } else if (rc == -EBUSY) {
1361 if (server->ops->rename_pending_delete) {
1362 rc = server->ops->rename_pending_delete(full_path,
1363 dentry, xid);
1364 if (rc == 0)
1365 cifs_drop_nlink(inode);
1366 }
1367 } else if ((rc == -EACCES) && (dosattr == 0) && inode) {
1368 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1369 if (attrs == NULL) {
1370 rc = -ENOMEM;
1371 goto out_reval;
1372 }
1373
1374 /* try to reset dos attributes */
1375 cifs_inode = CIFS_I(inode);
1376 origattr = cifs_inode->cifsAttrs;
1377 if (origattr == 0)
1378 origattr |= ATTR_NORMAL;
1379 dosattr = origattr & ~ATTR_READONLY;
1380 if (dosattr == 0)
1381 dosattr |= ATTR_NORMAL;
1382 dosattr |= ATTR_HIDDEN;
1383
1384 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1385 if (rc != 0)
1386 goto out_reval;
1387
1388 goto retry_std_delete;
1389 }
1390
1391 /* undo the setattr if we errored out and it's needed */
1392 if (rc != 0 && dosattr != 0)
1393 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
1394
1395out_reval:
1396 if (inode) {
1397 cifs_inode = CIFS_I(inode);
1398 cifs_inode->time = 0; /* will force revalidate to get info
1399 when needed */
1400 inode->i_ctime = current_time(inode);
1401 }
1402 dir->i_ctime = dir->i_mtime = current_time(dir);
1403 cifs_inode = CIFS_I(dir);
1404 CIFS_I(dir)->time = 0; /* force revalidate of dir as well */
1405unlink_out:
1406 kfree(full_path);
1407 kfree(attrs);
1408 free_xid(xid);
1409 cifs_put_tlink(tlink);
1410 return rc;
1411}
1412
1413static int
1414cifs_mkdir_qinfo(struct inode *parent, struct dentry *dentry, umode_t mode,
1415 const char *full_path, struct cifs_sb_info *cifs_sb,
1416 struct cifs_tcon *tcon, const unsigned int xid)
1417{
1418 int rc = 0;
1419 struct inode *inode = NULL;
1420
1421 if (tcon->unix_ext)
1422 rc = cifs_get_inode_info_unix(&inode, full_path, parent->i_sb,
1423 xid);
1424 else
1425 rc = cifs_get_inode_info(&inode, full_path, NULL, parent->i_sb,
1426 xid, NULL);
1427
1428 if (rc)
1429 return rc;
1430
1431 /*
1432 * setting nlink not necessary except in cases where we failed to get it
1433 * from the server or was set bogus. Also, since this is a brand new
1434 * inode, no need to grab the i_lock before setting the i_nlink.
1435 */
1436 if (inode->i_nlink < 2)
1437 set_nlink(inode, 2);
1438 mode &= ~current_umask();
1439 /* must turn on setgid bit if parent dir has it */
1440 if (parent->i_mode & S_ISGID)
1441 mode |= S_ISGID;
1442
1443 if (tcon->unix_ext) {
1444 struct cifs_unix_set_info_args args = {
1445 .mode = mode,
1446 .ctime = NO_CHANGE_64,
1447 .atime = NO_CHANGE_64,
1448 .mtime = NO_CHANGE_64,
1449 .device = 0,
1450 };
1451 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1452 args.uid = current_fsuid();
1453 if (parent->i_mode & S_ISGID)
1454 args.gid = parent->i_gid;
1455 else
1456 args.gid = current_fsgid();
1457 } else {
1458 args.uid = INVALID_UID; /* no change */
1459 args.gid = INVALID_GID; /* no change */
1460 }
1461 CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
1462 cifs_sb->local_nls,
1463 cifs_remap(cifs_sb));
1464 } else {
1465 struct TCP_Server_Info *server = tcon->ses->server;
1466 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1467 (mode & S_IWUGO) == 0 && server->ops->mkdir_setinfo)
1468 server->ops->mkdir_setinfo(inode, full_path, cifs_sb,
1469 tcon, xid);
1470 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
1471 inode->i_mode = (mode | S_IFDIR);
1472
1473 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1474 inode->i_uid = current_fsuid();
1475 if (inode->i_mode & S_ISGID)
1476 inode->i_gid = parent->i_gid;
1477 else
1478 inode->i_gid = current_fsgid();
1479 }
1480 }
1481 d_instantiate(dentry, inode);
1482 return rc;
1483}
1484
1485static int
1486cifs_posix_mkdir(struct inode *inode, struct dentry *dentry, umode_t mode,
1487 const char *full_path, struct cifs_sb_info *cifs_sb,
1488 struct cifs_tcon *tcon, const unsigned int xid)
1489{
1490 int rc = 0;
1491 u32 oplock = 0;
1492 FILE_UNIX_BASIC_INFO *info = NULL;
1493 struct inode *newinode = NULL;
1494 struct cifs_fattr fattr;
1495
1496 info = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1497 if (info == NULL) {
1498 rc = -ENOMEM;
1499 goto posix_mkdir_out;
1500 }
1501
1502 mode &= ~current_umask();
1503 rc = CIFSPOSIXCreate(xid, tcon, SMB_O_DIRECTORY | SMB_O_CREAT, mode,
1504 NULL /* netfid */, info, &oplock, full_path,
1505 cifs_sb->local_nls, cifs_remap(cifs_sb));
1506 if (rc == -EOPNOTSUPP)
1507 goto posix_mkdir_out;
1508 else if (rc) {
1509 cifs_dbg(FYI, "posix mkdir returned 0x%x\n", rc);
1510 d_drop(dentry);
1511 goto posix_mkdir_out;
1512 }
1513
1514 if (info->Type == cpu_to_le32(-1))
1515 /* no return info, go query for it */
1516 goto posix_mkdir_get_info;
1517 /*
1518 * BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if
1519 * need to set uid/gid.
1520 */
1521
1522 cifs_unix_basic_to_fattr(&fattr, info, cifs_sb);
1523 cifs_fill_uniqueid(inode->i_sb, &fattr);
1524 newinode = cifs_iget(inode->i_sb, &fattr);
1525 if (!newinode)
1526 goto posix_mkdir_get_info;
1527
1528 d_instantiate(dentry, newinode);
1529
1530#ifdef CONFIG_CIFS_DEBUG2
1531 cifs_dbg(FYI, "instantiated dentry %p %pd to inode %p\n",
1532 dentry, dentry, newinode);
1533
1534 if (newinode->i_nlink != 2)
1535 cifs_dbg(FYI, "unexpected number of links %d\n",
1536 newinode->i_nlink);
1537#endif
1538
1539posix_mkdir_out:
1540 kfree(info);
1541 return rc;
1542posix_mkdir_get_info:
1543 rc = cifs_mkdir_qinfo(inode, dentry, mode, full_path, cifs_sb, tcon,
1544 xid);
1545 goto posix_mkdir_out;
1546}
1547
1548int cifs_mkdir(struct inode *inode, struct dentry *direntry, umode_t mode)
1549{
1550 int rc = 0;
1551 unsigned int xid;
1552 struct cifs_sb_info *cifs_sb;
1553 struct tcon_link *tlink;
1554 struct cifs_tcon *tcon;
1555 struct TCP_Server_Info *server;
1556 char *full_path;
1557
1558 cifs_dbg(FYI, "In cifs_mkdir, mode = 0x%hx inode = 0x%p\n",
1559 mode, inode);
1560
1561 cifs_sb = CIFS_SB(inode->i_sb);
1562 tlink = cifs_sb_tlink(cifs_sb);
1563 if (IS_ERR(tlink))
1564 return PTR_ERR(tlink);
1565 tcon = tlink_tcon(tlink);
1566
1567 xid = get_xid();
1568
1569 full_path = build_path_from_dentry(direntry);
1570 if (full_path == NULL) {
1571 rc = -ENOMEM;
1572 goto mkdir_out;
1573 }
1574
1575 if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1576 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1577 rc = cifs_posix_mkdir(inode, direntry, mode, full_path, cifs_sb,
1578 tcon, xid);
1579 if (rc != -EOPNOTSUPP)
1580 goto mkdir_out;
1581 }
1582
1583 server = tcon->ses->server;
1584
1585 if (!server->ops->mkdir) {
1586 rc = -ENOSYS;
1587 goto mkdir_out;
1588 }
1589
1590 /* BB add setting the equivalent of mode via CreateX w/ACLs */
1591 rc = server->ops->mkdir(xid, tcon, full_path, cifs_sb);
1592 if (rc) {
1593 cifs_dbg(FYI, "cifs_mkdir returned 0x%x\n", rc);
1594 d_drop(direntry);
1595 goto mkdir_out;
1596 }
1597
1598 rc = cifs_mkdir_qinfo(inode, direntry, mode, full_path, cifs_sb, tcon,
1599 xid);
1600mkdir_out:
1601 /*
1602 * Force revalidate to get parent dir info when needed since cached
1603 * attributes are invalid now.
1604 */
1605 CIFS_I(inode)->time = 0;
1606 kfree(full_path);
1607 free_xid(xid);
1608 cifs_put_tlink(tlink);
1609 return rc;
1610}
1611
1612int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1613{
1614 int rc = 0;
1615 unsigned int xid;
1616 struct cifs_sb_info *cifs_sb;
1617 struct tcon_link *tlink;
1618 struct cifs_tcon *tcon;
1619 struct TCP_Server_Info *server;
1620 char *full_path = NULL;
1621 struct cifsInodeInfo *cifsInode;
1622
1623 cifs_dbg(FYI, "cifs_rmdir, inode = 0x%p\n", inode);
1624
1625 xid = get_xid();
1626
1627 full_path = build_path_from_dentry(direntry);
1628 if (full_path == NULL) {
1629 rc = -ENOMEM;
1630 goto rmdir_exit;
1631 }
1632
1633 cifs_sb = CIFS_SB(inode->i_sb);
1634 tlink = cifs_sb_tlink(cifs_sb);
1635 if (IS_ERR(tlink)) {
1636 rc = PTR_ERR(tlink);
1637 goto rmdir_exit;
1638 }
1639 tcon = tlink_tcon(tlink);
1640 server = tcon->ses->server;
1641
1642 if (!server->ops->rmdir) {
1643 rc = -ENOSYS;
1644 cifs_put_tlink(tlink);
1645 goto rmdir_exit;
1646 }
1647
1648 rc = server->ops->rmdir(xid, tcon, full_path, cifs_sb);
1649 cifs_put_tlink(tlink);
1650
1651 if (!rc) {
1652 spin_lock(&d_inode(direntry)->i_lock);
1653 i_size_write(d_inode(direntry), 0);
1654 clear_nlink(d_inode(direntry));
1655 spin_unlock(&d_inode(direntry)->i_lock);
1656 }
1657
1658 cifsInode = CIFS_I(d_inode(direntry));
1659 /* force revalidate to go get info when needed */
1660 cifsInode->time = 0;
1661
1662 cifsInode = CIFS_I(inode);
1663 /*
1664 * Force revalidate to get parent dir info when needed since cached
1665 * attributes are invalid now.
1666 */
1667 cifsInode->time = 0;
1668
1669 d_inode(direntry)->i_ctime = inode->i_ctime = inode->i_mtime =
1670 current_time(inode);
1671
1672rmdir_exit:
1673 kfree(full_path);
1674 free_xid(xid);
1675 return rc;
1676}
1677
1678static int
1679cifs_do_rename(const unsigned int xid, struct dentry *from_dentry,
1680 const char *from_path, struct dentry *to_dentry,
1681 const char *to_path)
1682{
1683 struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1684 struct tcon_link *tlink;
1685 struct cifs_tcon *tcon;
1686 struct TCP_Server_Info *server;
1687 struct cifs_fid fid;
1688 struct cifs_open_parms oparms;
1689 int oplock, rc;
1690
1691 tlink = cifs_sb_tlink(cifs_sb);
1692 if (IS_ERR(tlink))
1693 return PTR_ERR(tlink);
1694 tcon = tlink_tcon(tlink);
1695 server = tcon->ses->server;
1696
1697 if (!server->ops->rename)
1698 return -ENOSYS;
1699
1700 /* try path-based rename first */
1701 rc = server->ops->rename(xid, tcon, from_path, to_path, cifs_sb);
1702
1703 /*
1704 * Don't bother with rename by filehandle unless file is busy and
1705 * source. Note that cross directory moves do not work with
1706 * rename by filehandle to various Windows servers.
1707 */
1708 if (rc == 0 || rc != -EBUSY)
1709 goto do_rename_exit;
1710
1711 /* open-file renames don't work across directories */
1712 if (to_dentry->d_parent != from_dentry->d_parent)
1713 goto do_rename_exit;
1714
1715 oparms.tcon = tcon;
1716 oparms.cifs_sb = cifs_sb;
1717 /* open the file to be renamed -- we need DELETE perms */
1718 oparms.desired_access = DELETE;
1719 oparms.create_options = CREATE_NOT_DIR;
1720 oparms.disposition = FILE_OPEN;
1721 oparms.path = from_path;
1722 oparms.fid = &fid;
1723 oparms.reconnect = false;
1724
1725 rc = CIFS_open(xid, &oparms, &oplock, NULL);
1726 if (rc == 0) {
1727 rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid,
1728 (const char *) to_dentry->d_name.name,
1729 cifs_sb->local_nls, cifs_remap(cifs_sb));
1730 CIFSSMBClose(xid, tcon, fid.netfid);
1731 }
1732do_rename_exit:
1733 cifs_put_tlink(tlink);
1734 return rc;
1735}
1736
1737int
1738cifs_rename2(struct inode *source_dir, struct dentry *source_dentry,
1739 struct inode *target_dir, struct dentry *target_dentry,
1740 unsigned int flags)
1741{
1742 char *from_name = NULL;
1743 char *to_name = NULL;
1744 struct cifs_sb_info *cifs_sb;
1745 struct tcon_link *tlink;
1746 struct cifs_tcon *tcon;
1747 FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1748 FILE_UNIX_BASIC_INFO *info_buf_target;
1749 unsigned int xid;
1750 int rc, tmprc;
1751
1752 if (flags & ~RENAME_NOREPLACE)
1753 return -EINVAL;
1754
1755 cifs_sb = CIFS_SB(source_dir->i_sb);
1756 tlink = cifs_sb_tlink(cifs_sb);
1757 if (IS_ERR(tlink))
1758 return PTR_ERR(tlink);
1759 tcon = tlink_tcon(tlink);
1760
1761 xid = get_xid();
1762
1763 /*
1764 * we already have the rename sem so we do not need to
1765 * grab it again here to protect the path integrity
1766 */
1767 from_name = build_path_from_dentry(source_dentry);
1768 if (from_name == NULL) {
1769 rc = -ENOMEM;
1770 goto cifs_rename_exit;
1771 }
1772
1773 to_name = build_path_from_dentry(target_dentry);
1774 if (to_name == NULL) {
1775 rc = -ENOMEM;
1776 goto cifs_rename_exit;
1777 }
1778
1779 rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
1780 to_name);
1781
1782 /*
1783 * No-replace is the natural behavior for CIFS, so skip unlink hacks.
1784 */
1785 if (flags & RENAME_NOREPLACE)
1786 goto cifs_rename_exit;
1787
1788 if (rc == -EEXIST && tcon->unix_ext) {
1789 /*
1790 * Are src and dst hardlinks of same inode? We can only tell
1791 * with unix extensions enabled.
1792 */
1793 info_buf_source =
1794 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1795 GFP_KERNEL);
1796 if (info_buf_source == NULL) {
1797 rc = -ENOMEM;
1798 goto cifs_rename_exit;
1799 }
1800
1801 info_buf_target = info_buf_source + 1;
1802 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, from_name,
1803 info_buf_source,
1804 cifs_sb->local_nls,
1805 cifs_remap(cifs_sb));
1806 if (tmprc != 0)
1807 goto unlink_target;
1808
1809 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, to_name,
1810 info_buf_target,
1811 cifs_sb->local_nls,
1812 cifs_remap(cifs_sb));
1813
1814 if (tmprc == 0 && (info_buf_source->UniqueId ==
1815 info_buf_target->UniqueId)) {
1816 /* same file, POSIX says that this is a noop */
1817 rc = 0;
1818 goto cifs_rename_exit;
1819 }
1820 }
1821 /*
1822 * else ... BB we could add the same check for Windows by
1823 * checking the UniqueId via FILE_INTERNAL_INFO
1824 */
1825
1826unlink_target:
1827 /* Try unlinking the target dentry if it's not negative */
1828 if (d_really_is_positive(target_dentry) && (rc == -EACCES || rc == -EEXIST)) {
1829 if (d_is_dir(target_dentry))
1830 tmprc = cifs_rmdir(target_dir, target_dentry);
1831 else
1832 tmprc = cifs_unlink(target_dir, target_dentry);
1833 if (tmprc)
1834 goto cifs_rename_exit;
1835 rc = cifs_do_rename(xid, source_dentry, from_name,
1836 target_dentry, to_name);
1837 }
1838
1839 /* force revalidate to go get info when needed */
1840 CIFS_I(source_dir)->time = CIFS_I(target_dir)->time = 0;
1841
1842 source_dir->i_ctime = source_dir->i_mtime = target_dir->i_ctime =
1843 target_dir->i_mtime = current_time(source_dir);
1844
1845cifs_rename_exit:
1846 kfree(info_buf_source);
1847 kfree(from_name);
1848 kfree(to_name);
1849 free_xid(xid);
1850 cifs_put_tlink(tlink);
1851 return rc;
1852}
1853
1854static bool
1855cifs_inode_needs_reval(struct inode *inode)
1856{
1857 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1858 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1859
1860 if (CIFS_CACHE_READ(cifs_i))
1861 return false;
1862
1863 if (!lookupCacheEnabled)
1864 return true;
1865
1866 if (cifs_i->time == 0)
1867 return true;
1868
1869 if (!cifs_sb->actimeo)
1870 return true;
1871
1872 if (!time_in_range(jiffies, cifs_i->time,
1873 cifs_i->time + cifs_sb->actimeo))
1874 return true;
1875
1876 /* hardlinked files w/ noserverino get "special" treatment */
1877 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
1878 S_ISREG(inode->i_mode) && inode->i_nlink != 1)
1879 return true;
1880
1881 return false;
1882}
1883
1884/*
1885 * Zap the cache. Called when invalid_mapping flag is set.
1886 */
1887int
1888cifs_invalidate_mapping(struct inode *inode)
1889{
1890 int rc = 0;
1891
1892 if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
1893 rc = invalidate_inode_pages2(inode->i_mapping);
1894 if (rc)
1895 cifs_dbg(VFS, "%s: could not invalidate inode %p\n",
1896 __func__, inode);
1897 }
1898
1899 cifs_fscache_reset_inode_cookie(inode);
1900 return rc;
1901}
1902
1903/**
1904 * cifs_wait_bit_killable - helper for functions that are sleeping on bit locks
1905 * @word: long word containing the bit lock
1906 */
1907static int
1908cifs_wait_bit_killable(struct wait_bit_key *key, int mode)
1909{
1910 freezable_schedule_unsafe();
1911 if (signal_pending_state(mode, current))
1912 return -ERESTARTSYS;
1913 return 0;
1914}
1915
1916int
1917cifs_revalidate_mapping(struct inode *inode)
1918{
1919 int rc;
1920 unsigned long *flags = &CIFS_I(inode)->flags;
1921
1922 rc = wait_on_bit_lock_action(flags, CIFS_INO_LOCK, cifs_wait_bit_killable,
1923 TASK_KILLABLE);
1924 if (rc)
1925 return rc;
1926
1927 if (test_and_clear_bit(CIFS_INO_INVALID_MAPPING, flags)) {
1928 rc = cifs_invalidate_mapping(inode);
1929 if (rc)
1930 set_bit(CIFS_INO_INVALID_MAPPING, flags);
1931 }
1932
1933 clear_bit_unlock(CIFS_INO_LOCK, flags);
1934 smp_mb__after_atomic();
1935 wake_up_bit(flags, CIFS_INO_LOCK);
1936
1937 return rc;
1938}
1939
1940int
1941cifs_zap_mapping(struct inode *inode)
1942{
1943 set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(inode)->flags);
1944 return cifs_revalidate_mapping(inode);
1945}
1946
1947int cifs_revalidate_file_attr(struct file *filp)
1948{
1949 int rc = 0;
1950 struct inode *inode = file_inode(filp);
1951 struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
1952
1953 if (!cifs_inode_needs_reval(inode))
1954 return rc;
1955
1956 if (tlink_tcon(cfile->tlink)->unix_ext)
1957 rc = cifs_get_file_info_unix(filp);
1958 else
1959 rc = cifs_get_file_info(filp);
1960
1961 return rc;
1962}
1963
1964int cifs_revalidate_dentry_attr(struct dentry *dentry)
1965{
1966 unsigned int xid;
1967 int rc = 0;
1968 struct inode *inode = d_inode(dentry);
1969 struct super_block *sb = dentry->d_sb;
1970 char *full_path = NULL;
1971
1972 if (inode == NULL)
1973 return -ENOENT;
1974
1975 if (!cifs_inode_needs_reval(inode))
1976 return rc;
1977
1978 xid = get_xid();
1979
1980 /* can not safely grab the rename sem here if rename calls revalidate
1981 since that would deadlock */
1982 full_path = build_path_from_dentry(dentry);
1983 if (full_path == NULL) {
1984 rc = -ENOMEM;
1985 goto out;
1986 }
1987
1988 cifs_dbg(FYI, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time %ld jiffies %ld\n",
1989 full_path, inode, inode->i_count.counter,
1990 dentry, cifs_get_time(dentry), jiffies);
1991
1992 if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
1993 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
1994 else
1995 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
1996 xid, NULL);
1997
1998out:
1999 kfree(full_path);
2000 free_xid(xid);
2001 return rc;
2002}
2003
2004int cifs_revalidate_file(struct file *filp)
2005{
2006 int rc;
2007 struct inode *inode = file_inode(filp);
2008
2009 rc = cifs_revalidate_file_attr(filp);
2010 if (rc)
2011 return rc;
2012
2013 return cifs_revalidate_mapping(inode);
2014}
2015
2016/* revalidate a dentry's inode attributes */
2017int cifs_revalidate_dentry(struct dentry *dentry)
2018{
2019 int rc;
2020 struct inode *inode = d_inode(dentry);
2021
2022 rc = cifs_revalidate_dentry_attr(dentry);
2023 if (rc)
2024 return rc;
2025
2026 return cifs_revalidate_mapping(inode);
2027}
2028
2029int cifs_getattr(const struct path *path, struct kstat *stat,
2030 u32 request_mask, unsigned int flags)
2031{
2032 struct dentry *dentry = path->dentry;
2033 struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
2034 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
2035 struct inode *inode = d_inode(dentry);
2036 int rc;
2037
2038 /*
2039 * We need to be sure that all dirty pages are written and the server
2040 * has actual ctime, mtime and file length.
2041 */
2042 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
2043 inode->i_mapping->nrpages != 0) {
2044 rc = filemap_fdatawait(inode->i_mapping);
2045 if (rc) {
2046 mapping_set_error(inode->i_mapping, rc);
2047 return rc;
2048 }
2049 }
2050
2051 rc = cifs_revalidate_dentry_attr(dentry);
2052 if (rc)
2053 return rc;
2054
2055 generic_fillattr(inode, stat);
2056 stat->blksize = CIFS_MAX_MSGSIZE;
2057 stat->ino = CIFS_I(inode)->uniqueid;
2058
2059 /* old CIFS Unix Extensions doesn't return create time */
2060 if (CIFS_I(inode)->createtime) {
2061 stat->result_mask |= STATX_BTIME;
2062 stat->btime =
2063 cifs_NTtimeToUnix(cpu_to_le64(CIFS_I(inode)->createtime));
2064 }
2065
2066 stat->attributes_mask |= (STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED);
2067 if (CIFS_I(inode)->cifsAttrs & FILE_ATTRIBUTE_COMPRESSED)
2068 stat->attributes |= STATX_ATTR_COMPRESSED;
2069 if (CIFS_I(inode)->cifsAttrs & FILE_ATTRIBUTE_ENCRYPTED)
2070 stat->attributes |= STATX_ATTR_ENCRYPTED;
2071
2072 /*
2073 * If on a multiuser mount without unix extensions or cifsacl being
2074 * enabled, and the admin hasn't overridden them, set the ownership
2075 * to the fsuid/fsgid of the current process.
2076 */
2077 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
2078 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
2079 !tcon->unix_ext) {
2080 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
2081 stat->uid = current_fsuid();
2082 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
2083 stat->gid = current_fsgid();
2084 }
2085 return rc;
2086}
2087
2088static int cifs_truncate_page(struct address_space *mapping, loff_t from)
2089{
2090 pgoff_t index = from >> PAGE_SHIFT;
2091 unsigned offset = from & (PAGE_SIZE - 1);
2092 struct page *page;
2093 int rc = 0;
2094
2095 page = grab_cache_page(mapping, index);
2096 if (!page)
2097 return -ENOMEM;
2098
2099 zero_user_segment(page, offset, PAGE_SIZE);
2100 unlock_page(page);
2101 put_page(page);
2102 return rc;
2103}
2104
2105static void cifs_setsize(struct inode *inode, loff_t offset)
2106{
2107 spin_lock(&inode->i_lock);
2108 i_size_write(inode, offset);
2109 spin_unlock(&inode->i_lock);
2110
2111 truncate_pagecache(inode, offset);
2112}
2113
2114static int
2115cifs_set_file_size(struct inode *inode, struct iattr *attrs,
2116 unsigned int xid, char *full_path)
2117{
2118 int rc;
2119 struct cifsFileInfo *open_file;
2120 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2121 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2122 struct tcon_link *tlink = NULL;
2123 struct cifs_tcon *tcon = NULL;
2124 struct TCP_Server_Info *server;
2125
2126 /*
2127 * To avoid spurious oplock breaks from server, in the case of
2128 * inodes that we already have open, avoid doing path based
2129 * setting of file size if we can do it by handle.
2130 * This keeps our caching token (oplock) and avoids timeouts
2131 * when the local oplock break takes longer to flush
2132 * writebehind data than the SMB timeout for the SetPathInfo
2133 * request would allow
2134 */
2135 open_file = find_writable_file(cifsInode, true);
2136 if (open_file) {
2137 tcon = tlink_tcon(open_file->tlink);
2138 server = tcon->ses->server;
2139 if (server->ops->set_file_size)
2140 rc = server->ops->set_file_size(xid, tcon, open_file,
2141 attrs->ia_size, false);
2142 else
2143 rc = -ENOSYS;
2144 cifsFileInfo_put(open_file);
2145 cifs_dbg(FYI, "SetFSize for attrs rc = %d\n", rc);
2146 } else
2147 rc = -EINVAL;
2148
2149 if (!rc)
2150 goto set_size_out;
2151
2152 if (tcon == NULL) {
2153 tlink = cifs_sb_tlink(cifs_sb);
2154 if (IS_ERR(tlink))
2155 return PTR_ERR(tlink);
2156 tcon = tlink_tcon(tlink);
2157 server = tcon->ses->server;
2158 }
2159
2160 /*
2161 * Set file size by pathname rather than by handle either because no
2162 * valid, writeable file handle for it was found or because there was
2163 * an error setting it by handle.
2164 */
2165 if (server->ops->set_path_size)
2166 rc = server->ops->set_path_size(xid, tcon, full_path,
2167 attrs->ia_size, cifs_sb, false);
2168 else
2169 rc = -ENOSYS;
2170 cifs_dbg(FYI, "SetEOF by path (setattrs) rc = %d\n", rc);
2171
2172 if (tlink)
2173 cifs_put_tlink(tlink);
2174
2175set_size_out:
2176 if (rc == 0) {
2177 cifsInode->server_eof = attrs->ia_size;
2178 cifs_setsize(inode, attrs->ia_size);
2179 cifs_truncate_page(inode->i_mapping, inode->i_size);
2180 }
2181
2182 return rc;
2183}
2184
2185static int
2186cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
2187{
2188 int rc;
2189 unsigned int xid;
2190 char *full_path = NULL;
2191 struct inode *inode = d_inode(direntry);
2192 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2193 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2194 struct tcon_link *tlink;
2195 struct cifs_tcon *pTcon;
2196 struct cifs_unix_set_info_args *args = NULL;
2197 struct cifsFileInfo *open_file;
2198
2199 cifs_dbg(FYI, "setattr_unix on file %pd attrs->ia_valid=0x%x\n",
2200 direntry, attrs->ia_valid);
2201
2202 xid = get_xid();
2203
2204 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2205 attrs->ia_valid |= ATTR_FORCE;
2206
2207 rc = setattr_prepare(direntry, attrs);
2208 if (rc < 0)
2209 goto out;
2210
2211 full_path = build_path_from_dentry(direntry);
2212 if (full_path == NULL) {
2213 rc = -ENOMEM;
2214 goto out;
2215 }
2216
2217 /*
2218 * Attempt to flush data before changing attributes. We need to do
2219 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2220 * ownership or mode then we may also need to do this. Here, we take
2221 * the safe way out and just do the flush on all setattr requests. If
2222 * the flush returns error, store it to report later and continue.
2223 *
2224 * BB: This should be smarter. Why bother flushing pages that
2225 * will be truncated anyway? Also, should we error out here if
2226 * the flush returns error?
2227 */
2228 rc = filemap_write_and_wait(inode->i_mapping);
2229 mapping_set_error(inode->i_mapping, rc);
2230 rc = 0;
2231
2232 if (attrs->ia_valid & ATTR_SIZE) {
2233 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2234 if (rc != 0)
2235 goto out;
2236 }
2237
2238 /* skip mode change if it's just for clearing setuid/setgid */
2239 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2240 attrs->ia_valid &= ~ATTR_MODE;
2241
2242 args = kmalloc(sizeof(*args), GFP_KERNEL);
2243 if (args == NULL) {
2244 rc = -ENOMEM;
2245 goto out;
2246 }
2247
2248 /* set up the struct */
2249 if (attrs->ia_valid & ATTR_MODE)
2250 args->mode = attrs->ia_mode;
2251 else
2252 args->mode = NO_CHANGE_64;
2253
2254 if (attrs->ia_valid & ATTR_UID)
2255 args->uid = attrs->ia_uid;
2256 else
2257 args->uid = INVALID_UID; /* no change */
2258
2259 if (attrs->ia_valid & ATTR_GID)
2260 args->gid = attrs->ia_gid;
2261 else
2262 args->gid = INVALID_GID; /* no change */
2263
2264 if (attrs->ia_valid & ATTR_ATIME)
2265 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
2266 else
2267 args->atime = NO_CHANGE_64;
2268
2269 if (attrs->ia_valid & ATTR_MTIME)
2270 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
2271 else
2272 args->mtime = NO_CHANGE_64;
2273
2274 if (attrs->ia_valid & ATTR_CTIME)
2275 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
2276 else
2277 args->ctime = NO_CHANGE_64;
2278
2279 args->device = 0;
2280 open_file = find_writable_file(cifsInode, true);
2281 if (open_file) {
2282 u16 nfid = open_file->fid.netfid;
2283 u32 npid = open_file->pid;
2284 pTcon = tlink_tcon(open_file->tlink);
2285 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
2286 cifsFileInfo_put(open_file);
2287 } else {
2288 tlink = cifs_sb_tlink(cifs_sb);
2289 if (IS_ERR(tlink)) {
2290 rc = PTR_ERR(tlink);
2291 goto out;
2292 }
2293 pTcon = tlink_tcon(tlink);
2294 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
2295 cifs_sb->local_nls,
2296 cifs_remap(cifs_sb));
2297 cifs_put_tlink(tlink);
2298 }
2299
2300 if (rc)
2301 goto out;
2302
2303 if ((attrs->ia_valid & ATTR_SIZE) &&
2304 attrs->ia_size != i_size_read(inode))
2305 truncate_setsize(inode, attrs->ia_size);
2306
2307 setattr_copy(inode, attrs);
2308 mark_inode_dirty(inode);
2309
2310 /* force revalidate when any of these times are set since some
2311 of the fs types (eg ext3, fat) do not have fine enough
2312 time granularity to match protocol, and we do not have a
2313 a way (yet) to query the server fs's time granularity (and
2314 whether it rounds times down).
2315 */
2316 if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
2317 cifsInode->time = 0;
2318out:
2319 kfree(args);
2320 kfree(full_path);
2321 free_xid(xid);
2322 return rc;
2323}
2324
2325static int
2326cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
2327{
2328 unsigned int xid;
2329 kuid_t uid = INVALID_UID;
2330 kgid_t gid = INVALID_GID;
2331 struct inode *inode = d_inode(direntry);
2332 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2333 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2334 char *full_path = NULL;
2335 int rc = -EACCES;
2336 __u32 dosattr = 0;
2337 __u64 mode = NO_CHANGE_64;
2338
2339 xid = get_xid();
2340
2341 cifs_dbg(FYI, "setattr on file %pd attrs->iavalid 0x%x\n",
2342 direntry, attrs->ia_valid);
2343
2344 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2345 attrs->ia_valid |= ATTR_FORCE;
2346
2347 rc = setattr_prepare(direntry, attrs);
2348 if (rc < 0) {
2349 free_xid(xid);
2350 return rc;
2351 }
2352
2353 full_path = build_path_from_dentry(direntry);
2354 if (full_path == NULL) {
2355 rc = -ENOMEM;
2356 free_xid(xid);
2357 return rc;
2358 }
2359
2360 /*
2361 * Attempt to flush data before changing attributes. We need to do
2362 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2363 * ownership or mode then we may also need to do this. Here, we take
2364 * the safe way out and just do the flush on all setattr requests. If
2365 * the flush returns error, store it to report later and continue.
2366 *
2367 * BB: This should be smarter. Why bother flushing pages that
2368 * will be truncated anyway? Also, should we error out here if
2369 * the flush returns error?
2370 */
2371 rc = filemap_write_and_wait(inode->i_mapping);
2372 mapping_set_error(inode->i_mapping, rc);
2373 rc = 0;
2374
2375 if (attrs->ia_valid & ATTR_SIZE) {
2376 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2377 if (rc != 0)
2378 goto cifs_setattr_exit;
2379 }
2380
2381 if (attrs->ia_valid & ATTR_UID)
2382 uid = attrs->ia_uid;
2383
2384 if (attrs->ia_valid & ATTR_GID)
2385 gid = attrs->ia_gid;
2386
2387#ifdef CONFIG_CIFS_ACL
2388 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2389 if (uid_valid(uid) || gid_valid(gid)) {
2390 rc = id_mode_to_cifs_acl(inode, full_path, NO_CHANGE_64,
2391 uid, gid);
2392 if (rc) {
2393 cifs_dbg(FYI, "%s: Setting id failed with error: %d\n",
2394 __func__, rc);
2395 goto cifs_setattr_exit;
2396 }
2397 }
2398 } else
2399#endif /* CONFIG_CIFS_ACL */
2400 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
2401 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
2402
2403 /* skip mode change if it's just for clearing setuid/setgid */
2404 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2405 attrs->ia_valid &= ~ATTR_MODE;
2406
2407 if (attrs->ia_valid & ATTR_MODE) {
2408 mode = attrs->ia_mode;
2409 rc = 0;
2410#ifdef CONFIG_CIFS_ACL
2411 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2412 rc = id_mode_to_cifs_acl(inode, full_path, mode,
2413 INVALID_UID, INVALID_GID);
2414 if (rc) {
2415 cifs_dbg(FYI, "%s: Setting ACL failed with error: %d\n",
2416 __func__, rc);
2417 goto cifs_setattr_exit;
2418 }
2419 } else
2420#endif /* CONFIG_CIFS_ACL */
2421 if (((mode & S_IWUGO) == 0) &&
2422 (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
2423
2424 dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
2425
2426 /* fix up mode if we're not using dynperm */
2427 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
2428 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
2429 } else if ((mode & S_IWUGO) &&
2430 (cifsInode->cifsAttrs & ATTR_READONLY)) {
2431
2432 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
2433 /* Attributes of 0 are ignored */
2434 if (dosattr == 0)
2435 dosattr |= ATTR_NORMAL;
2436
2437 /* reset local inode permissions to normal */
2438 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2439 attrs->ia_mode &= ~(S_IALLUGO);
2440 if (S_ISDIR(inode->i_mode))
2441 attrs->ia_mode |=
2442 cifs_sb->mnt_dir_mode;
2443 else
2444 attrs->ia_mode |=
2445 cifs_sb->mnt_file_mode;
2446 }
2447 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2448 /* ignore mode change - ATTR_READONLY hasn't changed */
2449 attrs->ia_valid &= ~ATTR_MODE;
2450 }
2451 }
2452
2453 if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
2454 ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
2455 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
2456 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
2457
2458 /* Even if error on time set, no sense failing the call if
2459 the server would set the time to a reasonable value anyway,
2460 and this check ensures that we are not being called from
2461 sys_utimes in which case we ought to fail the call back to
2462 the user when the server rejects the call */
2463 if ((rc) && (attrs->ia_valid &
2464 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
2465 rc = 0;
2466 }
2467
2468 /* do not need local check to inode_check_ok since the server does
2469 that */
2470 if (rc)
2471 goto cifs_setattr_exit;
2472
2473 if ((attrs->ia_valid & ATTR_SIZE) &&
2474 attrs->ia_size != i_size_read(inode))
2475 truncate_setsize(inode, attrs->ia_size);
2476
2477 setattr_copy(inode, attrs);
2478 mark_inode_dirty(inode);
2479
2480cifs_setattr_exit:
2481 kfree(full_path);
2482 free_xid(xid);
2483 return rc;
2484}
2485
2486int
2487cifs_setattr(struct dentry *direntry, struct iattr *attrs)
2488{
2489 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
2490 struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
2491
2492 if (pTcon->unix_ext)
2493 return cifs_setattr_unix(direntry, attrs);
2494
2495 return cifs_setattr_nounix(direntry, attrs);
2496
2497 /* BB: add cifs_setattr_legacy for really old servers */
2498}
2499
2500#if 0
2501void cifs_delete_inode(struct inode *inode)
2502{
2503 cifs_dbg(FYI, "In cifs_delete_inode, inode = 0x%p\n", inode);
2504 /* may have to add back in if and when safe distributed caching of
2505 directories added e.g. via FindNotify */
2506}
2507#endif