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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 if (IS_AUTOMOUNT(inode)) {
62 inode->i_op = &cifs_namespace_inode_operations;
63 } else {
64 inode->i_op = &cifs_dir_inode_ops;
65 inode->i_fop = &cifs_dir_ops;
66 }
67 break;
68 case S_IFLNK:
69 inode->i_op = &cifs_symlink_inode_ops;
70 break;
71 default:
72 init_special_inode(inode, inode->i_mode, inode->i_rdev);
73 break;
74 }
75}
76
77/* check inode attributes against fattr. If they don't match, tag the
78 * inode for cache invalidation
79 */
80static void
81cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
82{
83 struct cifs_fscache_inode_coherency_data cd;
84 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
85 struct timespec64 mtime;
86
87 cifs_dbg(FYI, "%s: revalidating inode %llu\n",
88 __func__, cifs_i->uniqueid);
89
90 if (inode->i_state & I_NEW) {
91 cifs_dbg(FYI, "%s: inode %llu is new\n",
92 __func__, cifs_i->uniqueid);
93 return;
94 }
95
96 /* don't bother with revalidation if we have an oplock */
97 if (CIFS_CACHE_READ(cifs_i)) {
98 cifs_dbg(FYI, "%s: inode %llu is oplocked\n",
99 __func__, cifs_i->uniqueid);
100 return;
101 }
102
103 /* revalidate if mtime or size have changed */
104 fattr->cf_mtime = timestamp_truncate(fattr->cf_mtime, inode);
105 mtime = inode_get_mtime(inode);
106 if (timespec64_equal(&mtime, &fattr->cf_mtime) &&
107 cifs_i->netfs.remote_i_size == fattr->cf_eof) {
108 cifs_dbg(FYI, "%s: inode %llu is unchanged\n",
109 __func__, cifs_i->uniqueid);
110 return;
111 }
112
113 cifs_dbg(FYI, "%s: invalidating inode %llu mapping\n",
114 __func__, cifs_i->uniqueid);
115 set_bit(CIFS_INO_INVALID_MAPPING, &cifs_i->flags);
116 /* Invalidate fscache cookie */
117 cifs_fscache_fill_coherency(&cifs_i->netfs.inode, &cd);
118 fscache_invalidate(cifs_inode_cookie(inode), &cd, i_size_read(inode), 0);
119}
120
121/*
122 * copy nlink to the inode, unless it wasn't provided. Provide
123 * sane values if we don't have an existing one and none was provided
124 */
125static void
126cifs_nlink_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
127{
128 /*
129 * if we're in a situation where we can't trust what we
130 * got from the server (readdir, some non-unix cases)
131 * fake reasonable values
132 */
133 if (fattr->cf_flags & CIFS_FATTR_UNKNOWN_NLINK) {
134 /* only provide fake values on a new inode */
135 if (inode->i_state & I_NEW) {
136 if (fattr->cf_cifsattrs & ATTR_DIRECTORY)
137 set_nlink(inode, 2);
138 else
139 set_nlink(inode, 1);
140 }
141 return;
142 }
143
144 /* we trust the server, so update it */
145 set_nlink(inode, fattr->cf_nlink);
146}
147
148/* populate an inode with info from a cifs_fattr struct */
149int
150cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
151{
152 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
153 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
154
155 if (!(inode->i_state & I_NEW) &&
156 unlikely(inode_wrong_type(inode, fattr->cf_mode))) {
157 CIFS_I(inode)->time = 0; /* force reval */
158 return -ESTALE;
159 }
160
161 cifs_revalidate_cache(inode, fattr);
162
163 spin_lock(&inode->i_lock);
164 fattr->cf_mtime = timestamp_truncate(fattr->cf_mtime, inode);
165 fattr->cf_atime = timestamp_truncate(fattr->cf_atime, inode);
166 fattr->cf_ctime = timestamp_truncate(fattr->cf_ctime, inode);
167 /* we do not want atime to be less than mtime, it broke some apps */
168 if (timespec64_compare(&fattr->cf_atime, &fattr->cf_mtime) < 0)
169 inode_set_atime_to_ts(inode, fattr->cf_mtime);
170 else
171 inode_set_atime_to_ts(inode, fattr->cf_atime);
172 inode_set_mtime_to_ts(inode, fattr->cf_mtime);
173 inode_set_ctime_to_ts(inode, fattr->cf_ctime);
174 inode->i_rdev = fattr->cf_rdev;
175 cifs_nlink_fattr_to_inode(inode, fattr);
176 inode->i_uid = fattr->cf_uid;
177 inode->i_gid = fattr->cf_gid;
178
179 /* if dynperm is set, don't clobber existing mode */
180 if (inode->i_state & I_NEW ||
181 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM))
182 inode->i_mode = fattr->cf_mode;
183
184 cifs_i->cifsAttrs = fattr->cf_cifsattrs;
185 cifs_i->reparse_tag = fattr->cf_cifstag;
186
187 if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
188 cifs_i->time = 0;
189 else
190 cifs_i->time = jiffies;
191
192 if (fattr->cf_flags & CIFS_FATTR_DELETE_PENDING)
193 set_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags);
194 else
195 clear_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags);
196
197 cifs_i->netfs.remote_i_size = fattr->cf_eof;
198 /*
199 * Can't safely change the file size here if the client is writing to
200 * it due to potential races.
201 */
202 if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) {
203 i_size_write(inode, fattr->cf_eof);
204
205 /*
206 * i_blocks is not related to (i_size / i_blksize),
207 * but instead 512 byte (2**9) size is required for
208 * calculating num blocks.
209 */
210 inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
211 }
212
213 if (S_ISLNK(fattr->cf_mode) && fattr->cf_symlink_target) {
214 kfree(cifs_i->symlink_target);
215 cifs_i->symlink_target = fattr->cf_symlink_target;
216 fattr->cf_symlink_target = NULL;
217 }
218 spin_unlock(&inode->i_lock);
219
220 if (fattr->cf_flags & CIFS_FATTR_JUNCTION)
221 inode->i_flags |= S_AUTOMOUNT;
222 if (inode->i_state & I_NEW)
223 cifs_set_ops(inode);
224 return 0;
225}
226
227void
228cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
229{
230 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
231
232 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
233 return;
234
235 fattr->cf_uniqueid = iunique(sb, ROOT_I);
236}
237
238/* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
239void
240cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
241 struct cifs_sb_info *cifs_sb)
242{
243 memset(fattr, 0, sizeof(*fattr));
244 fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
245 fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
246 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
247
248 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
249 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime);
250 fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange);
251 /* old POSIX extensions don't get create time */
252
253 fattr->cf_mode = le64_to_cpu(info->Permissions);
254
255 /*
256 * Since we set the inode type below we need to mask off
257 * to avoid strange results if bits set above.
258 */
259 fattr->cf_mode &= ~S_IFMT;
260 switch (le32_to_cpu(info->Type)) {
261 case UNIX_FILE:
262 fattr->cf_mode |= S_IFREG;
263 fattr->cf_dtype = DT_REG;
264 break;
265 case UNIX_SYMLINK:
266 fattr->cf_mode |= S_IFLNK;
267 fattr->cf_dtype = DT_LNK;
268 break;
269 case UNIX_DIR:
270 fattr->cf_mode |= S_IFDIR;
271 fattr->cf_dtype = DT_DIR;
272 break;
273 case UNIX_CHARDEV:
274 fattr->cf_mode |= S_IFCHR;
275 fattr->cf_dtype = DT_CHR;
276 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
277 le64_to_cpu(info->DevMinor) & MINORMASK);
278 break;
279 case UNIX_BLOCKDEV:
280 fattr->cf_mode |= S_IFBLK;
281 fattr->cf_dtype = DT_BLK;
282 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
283 le64_to_cpu(info->DevMinor) & MINORMASK);
284 break;
285 case UNIX_FIFO:
286 fattr->cf_mode |= S_IFIFO;
287 fattr->cf_dtype = DT_FIFO;
288 break;
289 case UNIX_SOCKET:
290 fattr->cf_mode |= S_IFSOCK;
291 fattr->cf_dtype = DT_SOCK;
292 break;
293 default:
294 /* safest to call it a file if we do not know */
295 fattr->cf_mode |= S_IFREG;
296 fattr->cf_dtype = DT_REG;
297 cifs_dbg(FYI, "unknown type %d\n", le32_to_cpu(info->Type));
298 break;
299 }
300
301 fattr->cf_uid = cifs_sb->ctx->linux_uid;
302 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)) {
303 u64 id = le64_to_cpu(info->Uid);
304 if (id < ((uid_t)-1)) {
305 kuid_t uid = make_kuid(&init_user_ns, id);
306 if (uid_valid(uid))
307 fattr->cf_uid = uid;
308 }
309 }
310
311 fattr->cf_gid = cifs_sb->ctx->linux_gid;
312 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)) {
313 u64 id = le64_to_cpu(info->Gid);
314 if (id < ((gid_t)-1)) {
315 kgid_t gid = make_kgid(&init_user_ns, id);
316 if (gid_valid(gid))
317 fattr->cf_gid = gid;
318 }
319 }
320
321 fattr->cf_nlink = le64_to_cpu(info->Nlinks);
322}
323
324/*
325 * Fill a cifs_fattr struct with fake inode info.
326 *
327 * Needed to setup cifs_fattr data for the directory which is the
328 * junction to the new submount (ie to setup the fake directory
329 * which represents a DFS referral or reparse mount point).
330 */
331static void cifs_create_junction_fattr(struct cifs_fattr *fattr,
332 struct super_block *sb)
333{
334 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
335
336 cifs_dbg(FYI, "%s: creating fake fattr\n", __func__);
337
338 memset(fattr, 0, sizeof(*fattr));
339 fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
340 fattr->cf_uid = cifs_sb->ctx->linux_uid;
341 fattr->cf_gid = cifs_sb->ctx->linux_gid;
342 ktime_get_coarse_real_ts64(&fattr->cf_mtime);
343 fattr->cf_atime = fattr->cf_ctime = fattr->cf_mtime;
344 fattr->cf_nlink = 2;
345 fattr->cf_flags = CIFS_FATTR_JUNCTION;
346}
347
348/* Update inode with final fattr data */
349static int update_inode_info(struct super_block *sb,
350 struct cifs_fattr *fattr,
351 struct inode **inode)
352{
353 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
354 int rc = 0;
355
356 if (!*inode) {
357 *inode = cifs_iget(sb, fattr);
358 if (!*inode)
359 rc = -ENOMEM;
360 return rc;
361 }
362 /* We already have inode, update it.
363 *
364 * If file type or uniqueid is different, return error.
365 */
366 if (unlikely((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
367 CIFS_I(*inode)->uniqueid != fattr->cf_uniqueid)) {
368 CIFS_I(*inode)->time = 0; /* force reval */
369 return -ESTALE;
370 }
371 return cifs_fattr_to_inode(*inode, fattr);
372}
373
374#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
375static int
376cifs_get_file_info_unix(struct file *filp)
377{
378 int rc;
379 unsigned int xid;
380 FILE_UNIX_BASIC_INFO find_data;
381 struct cifs_fattr fattr = {};
382 struct inode *inode = file_inode(filp);
383 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
384 struct cifsFileInfo *cfile = filp->private_data;
385 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
386
387 xid = get_xid();
388
389 if (cfile->symlink_target) {
390 fattr.cf_symlink_target = kstrdup(cfile->symlink_target, GFP_KERNEL);
391 if (!fattr.cf_symlink_target) {
392 rc = -ENOMEM;
393 goto cifs_gfiunix_out;
394 }
395 }
396
397 rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->fid.netfid, &find_data);
398 if (!rc) {
399 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
400 } else if (rc == -EREMOTE) {
401 cifs_create_junction_fattr(&fattr, inode->i_sb);
402 rc = 0;
403 } else
404 goto cifs_gfiunix_out;
405
406 rc = cifs_fattr_to_inode(inode, &fattr);
407
408cifs_gfiunix_out:
409 free_xid(xid);
410 return rc;
411}
412
413static int cifs_get_unix_fattr(const unsigned char *full_path,
414 struct super_block *sb,
415 struct cifs_fattr *fattr,
416 struct inode **pinode,
417 const unsigned int xid)
418{
419 struct TCP_Server_Info *server;
420 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
421 FILE_UNIX_BASIC_INFO find_data;
422 struct cifs_tcon *tcon;
423 struct tcon_link *tlink;
424 int rc, tmprc;
425
426 cifs_dbg(FYI, "Getting info on %s\n", full_path);
427
428 tlink = cifs_sb_tlink(cifs_sb);
429 if (IS_ERR(tlink))
430 return PTR_ERR(tlink);
431 tcon = tlink_tcon(tlink);
432 server = tcon->ses->server;
433
434 /* could have done a find first instead but this returns more info */
435 rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
436 cifs_sb->local_nls, cifs_remap(cifs_sb));
437 cifs_dbg(FYI, "%s: query path info: rc = %d\n", __func__, rc);
438 cifs_put_tlink(tlink);
439
440 if (!rc) {
441 cifs_unix_basic_to_fattr(fattr, &find_data, cifs_sb);
442 } else if (rc == -EREMOTE) {
443 cifs_create_junction_fattr(fattr, sb);
444 rc = 0;
445 } else {
446 return rc;
447 }
448
449 if (!*pinode)
450 cifs_fill_uniqueid(sb, fattr);
451
452 /* check for Minshall+French symlinks */
453 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
454 tmprc = check_mf_symlink(xid, tcon, cifs_sb, fattr, full_path);
455 cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
456 }
457
458 if (S_ISLNK(fattr->cf_mode) && !fattr->cf_symlink_target) {
459 if (!server->ops->query_symlink)
460 return -EOPNOTSUPP;
461 rc = server->ops->query_symlink(xid, tcon,
462 cifs_sb, full_path,
463 &fattr->cf_symlink_target);
464 cifs_dbg(FYI, "%s: query_symlink: %d\n", __func__, rc);
465 }
466 return rc;
467}
468
469int cifs_get_inode_info_unix(struct inode **pinode,
470 const unsigned char *full_path,
471 struct super_block *sb, unsigned int xid)
472{
473 struct cifs_fattr fattr = {};
474 int rc;
475
476 rc = cifs_get_unix_fattr(full_path, sb, &fattr, pinode, xid);
477 if (rc)
478 goto out;
479
480 rc = update_inode_info(sb, &fattr, pinode);
481out:
482 kfree(fattr.cf_symlink_target);
483 return rc;
484}
485#else
486static inline int cifs_get_unix_fattr(const unsigned char *full_path,
487 struct super_block *sb,
488 struct cifs_fattr *fattr,
489 struct inode **pinode,
490 const unsigned int xid)
491{
492 return -EOPNOTSUPP;
493}
494
495int cifs_get_inode_info_unix(struct inode **pinode,
496 const unsigned char *full_path,
497 struct super_block *sb, unsigned int xid)
498{
499 return -EOPNOTSUPP;
500}
501#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
502
503static int
504cifs_sfu_type(struct cifs_fattr *fattr, const char *path,
505 struct cifs_sb_info *cifs_sb, unsigned int xid)
506{
507 int rc;
508 __u32 oplock;
509 struct tcon_link *tlink;
510 struct cifs_tcon *tcon;
511 struct cifs_fid fid;
512 struct cifs_open_parms oparms;
513 struct cifs_io_parms io_parms = {0};
514 char buf[24];
515 unsigned int bytes_read;
516 char *pbuf;
517 int buf_type = CIFS_NO_BUFFER;
518
519 pbuf = buf;
520
521 fattr->cf_mode &= ~S_IFMT;
522
523 if (fattr->cf_eof == 0) {
524 fattr->cf_mode |= S_IFIFO;
525 fattr->cf_dtype = DT_FIFO;
526 return 0;
527 } else if (fattr->cf_eof < 8) {
528 fattr->cf_mode |= S_IFREG;
529 fattr->cf_dtype = DT_REG;
530 return -EINVAL; /* EOPNOTSUPP? */
531 }
532
533 tlink = cifs_sb_tlink(cifs_sb);
534 if (IS_ERR(tlink))
535 return PTR_ERR(tlink);
536 tcon = tlink_tcon(tlink);
537
538 oparms = (struct cifs_open_parms) {
539 .tcon = tcon,
540 .cifs_sb = cifs_sb,
541 .desired_access = GENERIC_READ,
542 .create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),
543 .disposition = FILE_OPEN,
544 .path = path,
545 .fid = &fid,
546 };
547
548 if (tcon->ses->server->oplocks)
549 oplock = REQ_OPLOCK;
550 else
551 oplock = 0;
552 rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, NULL);
553 if (rc) {
554 cifs_dbg(FYI, "check sfu type of %s, open rc = %d\n", path, rc);
555 cifs_put_tlink(tlink);
556 return rc;
557 }
558
559 /* Read header */
560 io_parms.netfid = fid.netfid;
561 io_parms.pid = current->tgid;
562 io_parms.tcon = tcon;
563 io_parms.offset = 0;
564 io_parms.length = 24;
565
566 rc = tcon->ses->server->ops->sync_read(xid, &fid, &io_parms,
567 &bytes_read, &pbuf, &buf_type);
568 if ((rc == 0) && (bytes_read >= 8)) {
569 if (memcmp("IntxBLK", pbuf, 8) == 0) {
570 cifs_dbg(FYI, "Block device\n");
571 fattr->cf_mode |= S_IFBLK;
572 fattr->cf_dtype = DT_BLK;
573 if (bytes_read == 24) {
574 /* we have enough to decode dev num */
575 __u64 mjr; /* major */
576 __u64 mnr; /* minor */
577 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
578 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
579 fattr->cf_rdev = MKDEV(mjr, mnr);
580 }
581 } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
582 cifs_dbg(FYI, "Char device\n");
583 fattr->cf_mode |= S_IFCHR;
584 fattr->cf_dtype = DT_CHR;
585 if (bytes_read == 24) {
586 /* we have enough to decode dev num */
587 __u64 mjr; /* major */
588 __u64 mnr; /* minor */
589 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
590 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
591 fattr->cf_rdev = MKDEV(mjr, mnr);
592 }
593 } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
594 cifs_dbg(FYI, "Symlink\n");
595 fattr->cf_mode |= S_IFLNK;
596 fattr->cf_dtype = DT_LNK;
597 } else if (memcmp("LnxFIFO", pbuf, 8) == 0) {
598 cifs_dbg(FYI, "FIFO\n");
599 fattr->cf_mode |= S_IFIFO;
600 fattr->cf_dtype = DT_FIFO;
601 } else {
602 fattr->cf_mode |= S_IFREG; /* file? */
603 fattr->cf_dtype = DT_REG;
604 rc = -EOPNOTSUPP;
605 }
606 } else {
607 fattr->cf_mode |= S_IFREG; /* then it is a file */
608 fattr->cf_dtype = DT_REG;
609 rc = -EOPNOTSUPP; /* or some unknown SFU type */
610 }
611
612 tcon->ses->server->ops->close(xid, tcon, &fid);
613 cifs_put_tlink(tlink);
614 return rc;
615}
616
617#define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */
618
619/*
620 * Fetch mode bits as provided by SFU.
621 *
622 * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ?
623 */
624static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
625 struct cifs_sb_info *cifs_sb, unsigned int xid)
626{
627#ifdef CONFIG_CIFS_XATTR
628 ssize_t rc;
629 char ea_value[4];
630 __u32 mode;
631 struct tcon_link *tlink;
632 struct cifs_tcon *tcon;
633
634 tlink = cifs_sb_tlink(cifs_sb);
635 if (IS_ERR(tlink))
636 return PTR_ERR(tlink);
637 tcon = tlink_tcon(tlink);
638
639 if (tcon->ses->server->ops->query_all_EAs == NULL) {
640 cifs_put_tlink(tlink);
641 return -EOPNOTSUPP;
642 }
643
644 rc = tcon->ses->server->ops->query_all_EAs(xid, tcon, path,
645 "SETFILEBITS", ea_value, 4 /* size of buf */,
646 cifs_sb);
647 cifs_put_tlink(tlink);
648 if (rc < 0)
649 return (int)rc;
650 else if (rc > 3) {
651 mode = le32_to_cpu(*((__le32 *)ea_value));
652 fattr->cf_mode &= ~SFBITS_MASK;
653 cifs_dbg(FYI, "special bits 0%o org mode 0%o\n",
654 mode, fattr->cf_mode);
655 fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode;
656 cifs_dbg(FYI, "special mode bits 0%o\n", mode);
657 }
658
659 return 0;
660#else
661 return -EOPNOTSUPP;
662#endif
663}
664
665/* Fill a cifs_fattr struct with info from POSIX info struct */
666static void smb311_posix_info_to_fattr(struct cifs_fattr *fattr,
667 struct cifs_open_info_data *data,
668 struct super_block *sb)
669{
670 struct smb311_posix_qinfo *info = &data->posix_fi;
671 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
672 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
673
674 memset(fattr, 0, sizeof(*fattr));
675
676 /* no fattr->flags to set */
677 fattr->cf_cifsattrs = le32_to_cpu(info->DosAttributes);
678 fattr->cf_uniqueid = le64_to_cpu(info->Inode);
679
680 if (info->LastAccessTime)
681 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
682 else
683 ktime_get_coarse_real_ts64(&fattr->cf_atime);
684
685 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
686 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
687
688 if (data->adjust_tz) {
689 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
690 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
691 }
692
693 /*
694 * The srv fs device id is overridden on network mount so setting
695 * @fattr->cf_rdev isn't needed here.
696 */
697 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
698 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
699 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
700 fattr->cf_nlink = le32_to_cpu(info->HardLinks);
701 fattr->cf_mode = (umode_t) le32_to_cpu(info->Mode);
702
703 if (cifs_open_data_reparse(data) &&
704 cifs_reparse_point_to_fattr(cifs_sb, fattr, data))
705 goto out_reparse;
706
707 fattr->cf_mode &= ~S_IFMT;
708 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
709 fattr->cf_mode |= S_IFDIR;
710 fattr->cf_dtype = DT_DIR;
711 } else { /* file */
712 fattr->cf_mode |= S_IFREG;
713 fattr->cf_dtype = DT_REG;
714 }
715
716out_reparse:
717 if (S_ISLNK(fattr->cf_mode)) {
718 if (likely(data->symlink_target))
719 fattr->cf_eof = strnlen(data->symlink_target, PATH_MAX);
720 fattr->cf_symlink_target = data->symlink_target;
721 data->symlink_target = NULL;
722 }
723 sid_to_id(cifs_sb, &data->posix_owner, fattr, SIDOWNER);
724 sid_to_id(cifs_sb, &data->posix_group, fattr, SIDGROUP);
725
726 cifs_dbg(FYI, "POSIX query info: mode 0x%x uniqueid 0x%llx nlink %d\n",
727 fattr->cf_mode, fattr->cf_uniqueid, fattr->cf_nlink);
728}
729
730static inline dev_t nfs_mkdev(struct reparse_posix_data *buf)
731{
732 u64 v = le64_to_cpu(*(__le64 *)buf->DataBuffer);
733
734 return MKDEV(v >> 32, v & 0xffffffff);
735}
736
737bool cifs_reparse_point_to_fattr(struct cifs_sb_info *cifs_sb,
738 struct cifs_fattr *fattr,
739 struct cifs_open_info_data *data)
740{
741 struct reparse_posix_data *buf = data->reparse.posix;
742 u32 tag = data->reparse.tag;
743
744 if (tag == IO_REPARSE_TAG_NFS && buf) {
745 switch (le64_to_cpu(buf->InodeType)) {
746 case NFS_SPECFILE_CHR:
747 fattr->cf_mode |= S_IFCHR;
748 fattr->cf_dtype = DT_CHR;
749 fattr->cf_rdev = nfs_mkdev(buf);
750 break;
751 case NFS_SPECFILE_BLK:
752 fattr->cf_mode |= S_IFBLK;
753 fattr->cf_dtype = DT_BLK;
754 fattr->cf_rdev = nfs_mkdev(buf);
755 break;
756 case NFS_SPECFILE_FIFO:
757 fattr->cf_mode |= S_IFIFO;
758 fattr->cf_dtype = DT_FIFO;
759 break;
760 case NFS_SPECFILE_SOCK:
761 fattr->cf_mode |= S_IFSOCK;
762 fattr->cf_dtype = DT_SOCK;
763 break;
764 case NFS_SPECFILE_LNK:
765 fattr->cf_mode |= S_IFLNK;
766 fattr->cf_dtype = DT_LNK;
767 break;
768 default:
769 WARN_ON_ONCE(1);
770 return false;
771 }
772 return true;
773 }
774
775 switch (tag) {
776 case IO_REPARSE_TAG_LX_SYMLINK:
777 fattr->cf_mode |= S_IFLNK;
778 fattr->cf_dtype = DT_LNK;
779 break;
780 case IO_REPARSE_TAG_LX_FIFO:
781 fattr->cf_mode |= S_IFIFO;
782 fattr->cf_dtype = DT_FIFO;
783 break;
784 case IO_REPARSE_TAG_AF_UNIX:
785 fattr->cf_mode |= S_IFSOCK;
786 fattr->cf_dtype = DT_SOCK;
787 break;
788 case IO_REPARSE_TAG_LX_CHR:
789 fattr->cf_mode |= S_IFCHR;
790 fattr->cf_dtype = DT_CHR;
791 break;
792 case IO_REPARSE_TAG_LX_BLK:
793 fattr->cf_mode |= S_IFBLK;
794 fattr->cf_dtype = DT_BLK;
795 break;
796 case 0: /* SMB1 symlink */
797 case IO_REPARSE_TAG_SYMLINK:
798 case IO_REPARSE_TAG_NFS:
799 fattr->cf_mode |= S_IFLNK;
800 fattr->cf_dtype = DT_LNK;
801 break;
802 default:
803 return false;
804 }
805 return true;
806}
807
808static void cifs_open_info_to_fattr(struct cifs_fattr *fattr,
809 struct cifs_open_info_data *data,
810 struct super_block *sb)
811{
812 struct smb2_file_all_info *info = &data->fi;
813 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
814 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
815
816 memset(fattr, 0, sizeof(*fattr));
817 fattr->cf_cifsattrs = le32_to_cpu(info->Attributes);
818 if (info->DeletePending)
819 fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING;
820
821 if (info->LastAccessTime)
822 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
823 else
824 ktime_get_coarse_real_ts64(&fattr->cf_atime);
825
826 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
827 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
828
829 if (data->adjust_tz) {
830 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
831 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
832 }
833
834 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
835 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
836 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
837 fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
838
839 fattr->cf_mode = cifs_sb->ctx->file_mode;
840 if (cifs_open_data_reparse(data) &&
841 cifs_reparse_point_to_fattr(cifs_sb, fattr, data))
842 goto out_reparse;
843
844 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
845 fattr->cf_mode = S_IFDIR | cifs_sb->ctx->dir_mode;
846 fattr->cf_dtype = DT_DIR;
847 /*
848 * Server can return wrong NumberOfLinks value for directories
849 * when Unix extensions are disabled - fake it.
850 */
851 if (!tcon->unix_ext)
852 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
853 } else {
854 fattr->cf_mode = S_IFREG | cifs_sb->ctx->file_mode;
855 fattr->cf_dtype = DT_REG;
856
857 /* clear write bits if ATTR_READONLY is set */
858 if (fattr->cf_cifsattrs & ATTR_READONLY)
859 fattr->cf_mode &= ~(S_IWUGO);
860
861 /*
862 * Don't accept zero nlink from non-unix servers unless
863 * delete is pending. Instead mark it as unknown.
864 */
865 if ((fattr->cf_nlink < 1) && !tcon->unix_ext &&
866 !info->DeletePending) {
867 cifs_dbg(VFS, "bogus file nlink value %u\n",
868 fattr->cf_nlink);
869 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
870 }
871 }
872
873out_reparse:
874 if (S_ISLNK(fattr->cf_mode)) {
875 if (likely(data->symlink_target))
876 fattr->cf_eof = strnlen(data->symlink_target, PATH_MAX);
877 fattr->cf_symlink_target = data->symlink_target;
878 data->symlink_target = NULL;
879 }
880
881 fattr->cf_uid = cifs_sb->ctx->linux_uid;
882 fattr->cf_gid = cifs_sb->ctx->linux_gid;
883}
884
885static int
886cifs_get_file_info(struct file *filp)
887{
888 int rc;
889 unsigned int xid;
890 struct cifs_open_info_data data = {};
891 struct cifs_fattr fattr;
892 struct inode *inode = file_inode(filp);
893 struct cifsFileInfo *cfile = filp->private_data;
894 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
895 struct TCP_Server_Info *server = tcon->ses->server;
896
897 if (!server->ops->query_file_info)
898 return -ENOSYS;
899
900 xid = get_xid();
901 rc = server->ops->query_file_info(xid, tcon, cfile, &data);
902 switch (rc) {
903 case 0:
904 /* TODO: add support to query reparse tag */
905 data.adjust_tz = false;
906 if (data.symlink_target) {
907 data.symlink = true;
908 data.reparse.tag = IO_REPARSE_TAG_SYMLINK;
909 }
910 cifs_open_info_to_fattr(&fattr, &data, inode->i_sb);
911 break;
912 case -EREMOTE:
913 cifs_create_junction_fattr(&fattr, inode->i_sb);
914 rc = 0;
915 break;
916 case -EOPNOTSUPP:
917 case -EINVAL:
918 /*
919 * FIXME: legacy server -- fall back to path-based call?
920 * for now, just skip revalidating and mark inode for
921 * immediate reval.
922 */
923 rc = 0;
924 CIFS_I(inode)->time = 0;
925 goto cgfi_exit;
926 default:
927 goto cgfi_exit;
928 }
929
930 /*
931 * don't bother with SFU junk here -- just mark inode as needing
932 * revalidation.
933 */
934 fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
935 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
936 /* if filetype is different, return error */
937 rc = cifs_fattr_to_inode(inode, &fattr);
938cgfi_exit:
939 cifs_free_open_info(&data);
940 free_xid(xid);
941 return rc;
942}
943
944/* Simple function to return a 64 bit hash of string. Rarely called */
945static __u64 simple_hashstr(const char *str)
946{
947 const __u64 hash_mult = 1125899906842597ULL; /* a big enough prime */
948 __u64 hash = 0;
949
950 while (*str)
951 hash = (hash + (__u64) *str++) * hash_mult;
952
953 return hash;
954}
955
956#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
957/**
958 * cifs_backup_query_path_info - SMB1 fallback code to get ino
959 *
960 * Fallback code to get file metadata when we don't have access to
961 * full_path (EACCES) and have backup creds.
962 *
963 * @xid: transaction id used to identify original request in logs
964 * @tcon: information about the server share we have mounted
965 * @sb: the superblock stores info such as disk space available
966 * @full_path: name of the file we are getting the metadata for
967 * @resp_buf: will be set to cifs resp buf and needs to be freed with
968 * cifs_buf_release() when done with @data
969 * @data: will be set to search info result buffer
970 */
971static int
972cifs_backup_query_path_info(int xid,
973 struct cifs_tcon *tcon,
974 struct super_block *sb,
975 const char *full_path,
976 void **resp_buf,
977 FILE_ALL_INFO **data)
978{
979 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
980 struct cifs_search_info info = {0};
981 u16 flags;
982 int rc;
983
984 *resp_buf = NULL;
985 info.endOfSearch = false;
986 if (tcon->unix_ext)
987 info.info_level = SMB_FIND_FILE_UNIX;
988 else if ((tcon->ses->capabilities &
989 tcon->ses->server->vals->cap_nt_find) == 0)
990 info.info_level = SMB_FIND_FILE_INFO_STANDARD;
991 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
992 info.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
993 else /* no srvino useful for fallback to some netapp */
994 info.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
995
996 flags = CIFS_SEARCH_CLOSE_ALWAYS |
997 CIFS_SEARCH_CLOSE_AT_END |
998 CIFS_SEARCH_BACKUP_SEARCH;
999
1000 rc = CIFSFindFirst(xid, tcon, full_path,
1001 cifs_sb, NULL, flags, &info, false);
1002 if (rc)
1003 return rc;
1004
1005 *resp_buf = (void *)info.ntwrk_buf_start;
1006 *data = (FILE_ALL_INFO *)info.srch_entries_start;
1007 return 0;
1008}
1009#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1010
1011static void cifs_set_fattr_ino(int xid, struct cifs_tcon *tcon, struct super_block *sb,
1012 struct inode **inode, const char *full_path,
1013 struct cifs_open_info_data *data, struct cifs_fattr *fattr)
1014{
1015 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1016 struct TCP_Server_Info *server = tcon->ses->server;
1017 int rc;
1018
1019 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
1020 if (*inode)
1021 fattr->cf_uniqueid = CIFS_I(*inode)->uniqueid;
1022 else
1023 fattr->cf_uniqueid = iunique(sb, ROOT_I);
1024 return;
1025 }
1026
1027 /*
1028 * If we have an inode pass a NULL tcon to ensure we don't
1029 * make a round trip to the server. This only works for SMB2+.
1030 */
1031 rc = server->ops->get_srv_inum(xid, *inode ? NULL : tcon, cifs_sb, full_path,
1032 &fattr->cf_uniqueid, data);
1033 if (rc) {
1034 /*
1035 * If that fails reuse existing ino or generate one
1036 * and disable server ones
1037 */
1038 if (*inode)
1039 fattr->cf_uniqueid = CIFS_I(*inode)->uniqueid;
1040 else {
1041 fattr->cf_uniqueid = iunique(sb, ROOT_I);
1042 cifs_autodisable_serverino(cifs_sb);
1043 }
1044 return;
1045 }
1046
1047 /* If no errors, check for zero root inode (invalid) */
1048 if (fattr->cf_uniqueid == 0 && strlen(full_path) == 0) {
1049 cifs_dbg(FYI, "Invalid (0) inodenum\n");
1050 if (*inode) {
1051 /* reuse */
1052 fattr->cf_uniqueid = CIFS_I(*inode)->uniqueid;
1053 } else {
1054 /* make an ino by hashing the UNC */
1055 fattr->cf_flags |= CIFS_FATTR_FAKE_ROOT_INO;
1056 fattr->cf_uniqueid = simple_hashstr(tcon->tree_name);
1057 }
1058 }
1059}
1060
1061static inline bool is_inode_cache_good(struct inode *ino)
1062{
1063 return ino && CIFS_CACHE_READ(CIFS_I(ino)) && CIFS_I(ino)->time != 0;
1064}
1065
1066static int reparse_info_to_fattr(struct cifs_open_info_data *data,
1067 struct super_block *sb,
1068 const unsigned int xid,
1069 struct cifs_tcon *tcon,
1070 const char *full_path,
1071 struct cifs_fattr *fattr)
1072{
1073 struct TCP_Server_Info *server = tcon->ses->server;
1074 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1075 struct kvec rsp_iov, *iov = NULL;
1076 int rsp_buftype = CIFS_NO_BUFFER;
1077 u32 tag = data->reparse.tag;
1078 int rc = 0;
1079
1080 if (!tag && server->ops->query_reparse_point) {
1081 rc = server->ops->query_reparse_point(xid, tcon, cifs_sb,
1082 full_path, &tag,
1083 &rsp_iov, &rsp_buftype);
1084 if (!rc)
1085 iov = &rsp_iov;
1086 } else if (data->reparse.io.buftype != CIFS_NO_BUFFER &&
1087 data->reparse.io.iov.iov_base) {
1088 iov = &data->reparse.io.iov;
1089 }
1090
1091 rc = -EOPNOTSUPP;
1092 switch ((data->reparse.tag = tag)) {
1093 case 0: /* SMB1 symlink */
1094 if (server->ops->query_symlink) {
1095 rc = server->ops->query_symlink(xid, tcon,
1096 cifs_sb, full_path,
1097 &data->symlink_target);
1098 }
1099 break;
1100 case IO_REPARSE_TAG_MOUNT_POINT:
1101 cifs_create_junction_fattr(fattr, sb);
1102 rc = 0;
1103 goto out;
1104 default:
1105 /* Check for cached reparse point data */
1106 if (data->symlink_target || data->reparse.buf) {
1107 rc = 0;
1108 } else if (iov && server->ops->parse_reparse_point) {
1109 rc = server->ops->parse_reparse_point(cifs_sb,
1110 iov, data);
1111 }
1112 break;
1113 }
1114
1115 if (tcon->posix_extensions)
1116 smb311_posix_info_to_fattr(fattr, data, sb);
1117 else
1118 cifs_open_info_to_fattr(fattr, data, sb);
1119out:
1120 fattr->cf_cifstag = data->reparse.tag;
1121 free_rsp_buf(rsp_buftype, rsp_iov.iov_base);
1122 return rc;
1123}
1124
1125static int cifs_get_fattr(struct cifs_open_info_data *data,
1126 struct super_block *sb, int xid,
1127 const struct cifs_fid *fid,
1128 struct cifs_fattr *fattr,
1129 struct inode **inode,
1130 const char *full_path)
1131{
1132 struct cifs_open_info_data tmp_data = {};
1133 struct cifs_tcon *tcon;
1134 struct TCP_Server_Info *server;
1135 struct tcon_link *tlink;
1136 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1137 void *smb1_backup_rsp_buf = NULL;
1138 int rc = 0;
1139 int tmprc = 0;
1140
1141 tlink = cifs_sb_tlink(cifs_sb);
1142 if (IS_ERR(tlink))
1143 return PTR_ERR(tlink);
1144 tcon = tlink_tcon(tlink);
1145 server = tcon->ses->server;
1146
1147 /*
1148 * 1. Fetch file metadata if not provided (data)
1149 */
1150
1151 if (!data) {
1152 rc = server->ops->query_path_info(xid, tcon, cifs_sb,
1153 full_path, &tmp_data);
1154 data = &tmp_data;
1155 }
1156
1157 /*
1158 * 2. Convert it to internal cifs metadata (fattr)
1159 */
1160
1161 switch (rc) {
1162 case 0:
1163 /*
1164 * If the file is a reparse point, it is more complicated
1165 * since we have to check if its reparse tag matches a known
1166 * special file type e.g. symlink or fifo or char etc.
1167 */
1168 if (cifs_open_data_reparse(data)) {
1169 rc = reparse_info_to_fattr(data, sb, xid, tcon,
1170 full_path, fattr);
1171 } else {
1172 cifs_open_info_to_fattr(fattr, data, sb);
1173 }
1174 break;
1175 case -EREMOTE:
1176 /* DFS link, no metadata available on this server */
1177 cifs_create_junction_fattr(fattr, sb);
1178 rc = 0;
1179 break;
1180 case -EACCES:
1181#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1182 /*
1183 * perm errors, try again with backup flags if possible
1184 *
1185 * For SMB2 and later the backup intent flag
1186 * is already sent if needed on open and there
1187 * is no path based FindFirst operation to use
1188 * to retry with
1189 */
1190 if (backup_cred(cifs_sb) && is_smb1_server(server)) {
1191 /* for easier reading */
1192 FILE_ALL_INFO *fi;
1193 FILE_DIRECTORY_INFO *fdi;
1194 SEARCH_ID_FULL_DIR_INFO *si;
1195
1196 rc = cifs_backup_query_path_info(xid, tcon, sb,
1197 full_path,
1198 &smb1_backup_rsp_buf,
1199 &fi);
1200 if (rc)
1201 goto out;
1202
1203 move_cifs_info_to_smb2(&data->fi, fi);
1204 fdi = (FILE_DIRECTORY_INFO *)fi;
1205 si = (SEARCH_ID_FULL_DIR_INFO *)fi;
1206
1207 cifs_dir_info_to_fattr(fattr, fdi, cifs_sb);
1208 fattr->cf_uniqueid = le64_to_cpu(si->UniqueId);
1209 /* uniqueid set, skip get inum step */
1210 goto handle_mnt_opt;
1211 } else {
1212 /* nothing we can do, bail out */
1213 goto out;
1214 }
1215#else
1216 goto out;
1217#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1218 break;
1219 default:
1220 cifs_dbg(FYI, "%s: unhandled err rc %d\n", __func__, rc);
1221 goto out;
1222 }
1223
1224 /*
1225 * 3. Get or update inode number (fattr->cf_uniqueid)
1226 */
1227
1228 cifs_set_fattr_ino(xid, tcon, sb, inode, full_path, data, fattr);
1229
1230 /*
1231 * 4. Tweak fattr based on mount options
1232 */
1233#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1234handle_mnt_opt:
1235#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1236 /* query for SFU type info if supported and needed */
1237 if ((fattr->cf_cifsattrs & ATTR_SYSTEM) &&
1238 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
1239 tmprc = cifs_sfu_type(fattr, full_path, cifs_sb, xid);
1240 if (tmprc)
1241 cifs_dbg(FYI, "cifs_sfu_type failed: %d\n", tmprc);
1242 }
1243
1244 /* fill in 0777 bits from ACL */
1245 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) {
1246 rc = cifs_acl_to_fattr(cifs_sb, fattr, *inode,
1247 true, full_path, fid);
1248 if (rc == -EREMOTE)
1249 rc = 0;
1250 if (rc) {
1251 cifs_dbg(FYI, "%s: Get mode from SID failed. rc=%d\n",
1252 __func__, rc);
1253 goto out;
1254 }
1255 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
1256 rc = cifs_acl_to_fattr(cifs_sb, fattr, *inode,
1257 false, full_path, fid);
1258 if (rc == -EREMOTE)
1259 rc = 0;
1260 if (rc) {
1261 cifs_dbg(FYI, "%s: Getting ACL failed with error: %d\n",
1262 __func__, rc);
1263 goto out;
1264 }
1265 }
1266
1267 /* fill in remaining high mode bits e.g. SUID, VTX */
1268 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
1269 cifs_sfu_mode(fattr, full_path, cifs_sb, xid);
1270
1271 /* check for Minshall+French symlinks */
1272 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
1273 tmprc = check_mf_symlink(xid, tcon, cifs_sb, fattr, full_path);
1274 cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
1275 }
1276
1277out:
1278 cifs_buf_release(smb1_backup_rsp_buf);
1279 cifs_put_tlink(tlink);
1280 cifs_free_open_info(&tmp_data);
1281 return rc;
1282}
1283
1284int cifs_get_inode_info(struct inode **inode,
1285 const char *full_path,
1286 struct cifs_open_info_data *data,
1287 struct super_block *sb, int xid,
1288 const struct cifs_fid *fid)
1289{
1290 struct cifs_fattr fattr = {};
1291 int rc;
1292
1293 if (is_inode_cache_good(*inode)) {
1294 cifs_dbg(FYI, "No need to revalidate cached inode sizes\n");
1295 return 0;
1296 }
1297
1298 rc = cifs_get_fattr(data, sb, xid, fid, &fattr, inode, full_path);
1299 if (rc)
1300 goto out;
1301
1302 rc = update_inode_info(sb, &fattr, inode);
1303out:
1304 kfree(fattr.cf_symlink_target);
1305 return rc;
1306}
1307
1308static int smb311_posix_get_fattr(struct cifs_open_info_data *data,
1309 struct cifs_fattr *fattr,
1310 const char *full_path,
1311 struct super_block *sb,
1312 const unsigned int xid)
1313{
1314 struct cifs_open_info_data tmp_data = {};
1315 struct TCP_Server_Info *server;
1316 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1317 struct cifs_tcon *tcon;
1318 struct tcon_link *tlink;
1319 int tmprc;
1320 int rc = 0;
1321
1322 tlink = cifs_sb_tlink(cifs_sb);
1323 if (IS_ERR(tlink))
1324 return PTR_ERR(tlink);
1325 tcon = tlink_tcon(tlink);
1326 server = tcon->ses->server;
1327
1328 /*
1329 * 1. Fetch file metadata if not provided (data)
1330 */
1331 if (!data) {
1332 rc = server->ops->query_path_info(xid, tcon, cifs_sb,
1333 full_path, &tmp_data);
1334 data = &tmp_data;
1335 }
1336
1337 /*
1338 * 2. Convert it to internal cifs metadata (fattr)
1339 */
1340
1341 switch (rc) {
1342 case 0:
1343 if (cifs_open_data_reparse(data)) {
1344 rc = reparse_info_to_fattr(data, sb, xid, tcon,
1345 full_path, fattr);
1346 } else {
1347 smb311_posix_info_to_fattr(fattr, data, sb);
1348 }
1349 break;
1350 case -EREMOTE:
1351 /* DFS link, no metadata available on this server */
1352 cifs_create_junction_fattr(fattr, sb);
1353 rc = 0;
1354 break;
1355 case -EACCES:
1356 /*
1357 * For SMB2 and later the backup intent flag
1358 * is already sent if needed on open and there
1359 * is no path based FindFirst operation to use
1360 * to retry with so nothing we can do, bail out
1361 */
1362 goto out;
1363 default:
1364 cifs_dbg(FYI, "%s: unhandled err rc %d\n", __func__, rc);
1365 goto out;
1366 }
1367
1368 /*
1369 * 3. Tweak fattr based on mount options
1370 */
1371 /* check for Minshall+French symlinks */
1372 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
1373 tmprc = check_mf_symlink(xid, tcon, cifs_sb, fattr, full_path);
1374 cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
1375 }
1376
1377out:
1378 cifs_put_tlink(tlink);
1379 cifs_free_open_info(data);
1380 return rc;
1381}
1382
1383int smb311_posix_get_inode_info(struct inode **inode,
1384 const char *full_path,
1385 struct cifs_open_info_data *data,
1386 struct super_block *sb,
1387 const unsigned int xid)
1388{
1389 struct cifs_fattr fattr = {};
1390 int rc;
1391
1392 if (is_inode_cache_good(*inode)) {
1393 cifs_dbg(FYI, "No need to revalidate cached inode sizes\n");
1394 return 0;
1395 }
1396
1397 rc = smb311_posix_get_fattr(data, &fattr, full_path, sb, xid);
1398 if (rc)
1399 goto out;
1400
1401 rc = update_inode_info(sb, &fattr, inode);
1402out:
1403 kfree(fattr.cf_symlink_target);
1404 return rc;
1405}
1406
1407static const struct inode_operations cifs_ipc_inode_ops = {
1408 .lookup = cifs_lookup,
1409};
1410
1411static int
1412cifs_find_inode(struct inode *inode, void *opaque)
1413{
1414 struct cifs_fattr *fattr = opaque;
1415
1416 /* don't match inode with different uniqueid */
1417 if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
1418 return 0;
1419
1420 /* use createtime like an i_generation field */
1421 if (CIFS_I(inode)->createtime != fattr->cf_createtime)
1422 return 0;
1423
1424 /* don't match inode of different type */
1425 if (inode_wrong_type(inode, fattr->cf_mode))
1426 return 0;
1427
1428 /* if it's not a directory or has no dentries, then flag it */
1429 if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry))
1430 fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
1431
1432 return 1;
1433}
1434
1435static int
1436cifs_init_inode(struct inode *inode, void *opaque)
1437{
1438 struct cifs_fattr *fattr = opaque;
1439
1440 CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
1441 CIFS_I(inode)->createtime = fattr->cf_createtime;
1442 return 0;
1443}
1444
1445/*
1446 * walk dentry list for an inode and report whether it has aliases that
1447 * are hashed. We use this to determine if a directory inode can actually
1448 * be used.
1449 */
1450static bool
1451inode_has_hashed_dentries(struct inode *inode)
1452{
1453 struct dentry *dentry;
1454
1455 spin_lock(&inode->i_lock);
1456 hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) {
1457 if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
1458 spin_unlock(&inode->i_lock);
1459 return true;
1460 }
1461 }
1462 spin_unlock(&inode->i_lock);
1463 return false;
1464}
1465
1466/* Given fattrs, get a corresponding inode */
1467struct inode *
1468cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
1469{
1470 unsigned long hash;
1471 struct inode *inode;
1472
1473retry_iget5_locked:
1474 cifs_dbg(FYI, "looking for uniqueid=%llu\n", fattr->cf_uniqueid);
1475
1476 /* hash down to 32-bits on 32-bit arch */
1477 hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
1478
1479 inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
1480 if (inode) {
1481 /* was there a potentially problematic inode collision? */
1482 if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
1483 fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
1484
1485 if (inode_has_hashed_dentries(inode)) {
1486 cifs_autodisable_serverino(CIFS_SB(sb));
1487 iput(inode);
1488 fattr->cf_uniqueid = iunique(sb, ROOT_I);
1489 goto retry_iget5_locked;
1490 }
1491 }
1492
1493 /* can't fail - see cifs_find_inode() */
1494 cifs_fattr_to_inode(inode, fattr);
1495 if (sb->s_flags & SB_NOATIME)
1496 inode->i_flags |= S_NOATIME | S_NOCMTIME;
1497 if (inode->i_state & I_NEW) {
1498 inode->i_ino = hash;
1499 cifs_fscache_get_inode_cookie(inode);
1500 unlock_new_inode(inode);
1501 }
1502 }
1503
1504 return inode;
1505}
1506
1507/* gets root inode */
1508struct inode *cifs_root_iget(struct super_block *sb)
1509{
1510 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1511 struct cifs_fattr fattr = {};
1512 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
1513 struct inode *inode = NULL;
1514 unsigned int xid;
1515 char *path = NULL;
1516 int len;
1517 int rc;
1518
1519 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
1520 && cifs_sb->prepath) {
1521 len = strlen(cifs_sb->prepath);
1522 path = kzalloc(len + 2 /* leading sep + null */, GFP_KERNEL);
1523 if (path == NULL)
1524 return ERR_PTR(-ENOMEM);
1525 path[0] = '/';
1526 memcpy(path+1, cifs_sb->prepath, len);
1527 } else {
1528 path = kstrdup("", GFP_KERNEL);
1529 if (path == NULL)
1530 return ERR_PTR(-ENOMEM);
1531 }
1532
1533 xid = get_xid();
1534 if (tcon->unix_ext) {
1535 rc = cifs_get_unix_fattr(path, sb, &fattr, &inode, xid);
1536 /* some servers mistakenly claim POSIX support */
1537 if (rc != -EOPNOTSUPP)
1538 goto iget_root;
1539 cifs_dbg(VFS, "server does not support POSIX extensions\n");
1540 tcon->unix_ext = false;
1541 }
1542
1543 convert_delimiter(path, CIFS_DIR_SEP(cifs_sb));
1544 if (tcon->posix_extensions)
1545 rc = smb311_posix_get_fattr(NULL, &fattr, path, sb, xid);
1546 else
1547 rc = cifs_get_fattr(NULL, sb, xid, NULL, &fattr, &inode, path);
1548
1549iget_root:
1550 if (!rc) {
1551 if (fattr.cf_flags & CIFS_FATTR_JUNCTION) {
1552 fattr.cf_flags &= ~CIFS_FATTR_JUNCTION;
1553 cifs_autodisable_serverino(cifs_sb);
1554 }
1555 inode = cifs_iget(sb, &fattr);
1556 }
1557
1558 if (!inode) {
1559 inode = ERR_PTR(rc);
1560 goto out;
1561 }
1562
1563 if (rc && tcon->pipe) {
1564 cifs_dbg(FYI, "ipc connection - fake read inode\n");
1565 spin_lock(&inode->i_lock);
1566 inode->i_mode |= S_IFDIR;
1567 set_nlink(inode, 2);
1568 inode->i_op = &cifs_ipc_inode_ops;
1569 inode->i_fop = &simple_dir_operations;
1570 inode->i_uid = cifs_sb->ctx->linux_uid;
1571 inode->i_gid = cifs_sb->ctx->linux_gid;
1572 spin_unlock(&inode->i_lock);
1573 } else if (rc) {
1574 iget_failed(inode);
1575 inode = ERR_PTR(rc);
1576 }
1577
1578out:
1579 kfree(path);
1580 free_xid(xid);
1581 kfree(fattr.cf_symlink_target);
1582 return inode;
1583}
1584
1585int
1586cifs_set_file_info(struct inode *inode, struct iattr *attrs, unsigned int xid,
1587 const char *full_path, __u32 dosattr)
1588{
1589 bool set_time = false;
1590 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1591 struct TCP_Server_Info *server;
1592 FILE_BASIC_INFO info_buf;
1593
1594 if (attrs == NULL)
1595 return -EINVAL;
1596
1597 server = cifs_sb_master_tcon(cifs_sb)->ses->server;
1598 if (!server->ops->set_file_info)
1599 return -ENOSYS;
1600
1601 info_buf.Pad = 0;
1602
1603 if (attrs->ia_valid & ATTR_ATIME) {
1604 set_time = true;
1605 info_buf.LastAccessTime =
1606 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1607 } else
1608 info_buf.LastAccessTime = 0;
1609
1610 if (attrs->ia_valid & ATTR_MTIME) {
1611 set_time = true;
1612 info_buf.LastWriteTime =
1613 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1614 } else
1615 info_buf.LastWriteTime = 0;
1616
1617 /*
1618 * Samba throws this field away, but windows may actually use it.
1619 * Do not set ctime unless other time stamps are changed explicitly
1620 * (i.e. by utimes()) since we would then have a mix of client and
1621 * server times.
1622 */
1623 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1624 cifs_dbg(FYI, "CIFS - CTIME changed\n");
1625 info_buf.ChangeTime =
1626 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1627 } else
1628 info_buf.ChangeTime = 0;
1629
1630 info_buf.CreationTime = 0; /* don't change */
1631 info_buf.Attributes = cpu_to_le32(dosattr);
1632
1633 return server->ops->set_file_info(inode, full_path, &info_buf, xid);
1634}
1635
1636#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1637/*
1638 * Open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
1639 * and rename it to a random name that hopefully won't conflict with
1640 * anything else.
1641 */
1642int
1643cifs_rename_pending_delete(const char *full_path, struct dentry *dentry,
1644 const unsigned int xid)
1645{
1646 int oplock = 0;
1647 int rc;
1648 struct cifs_fid fid;
1649 struct cifs_open_parms oparms;
1650 struct inode *inode = d_inode(dentry);
1651 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1652 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1653 struct tcon_link *tlink;
1654 struct cifs_tcon *tcon;
1655 __u32 dosattr, origattr;
1656 FILE_BASIC_INFO *info_buf = NULL;
1657
1658 tlink = cifs_sb_tlink(cifs_sb);
1659 if (IS_ERR(tlink))
1660 return PTR_ERR(tlink);
1661 tcon = tlink_tcon(tlink);
1662
1663 /*
1664 * We cannot rename the file if the server doesn't support
1665 * CAP_INFOLEVEL_PASSTHRU
1666 */
1667 if (!(tcon->ses->capabilities & CAP_INFOLEVEL_PASSTHRU)) {
1668 rc = -EBUSY;
1669 goto out;
1670 }
1671
1672 oparms = (struct cifs_open_parms) {
1673 .tcon = tcon,
1674 .cifs_sb = cifs_sb,
1675 .desired_access = DELETE | FILE_WRITE_ATTRIBUTES,
1676 .create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),
1677 .disposition = FILE_OPEN,
1678 .path = full_path,
1679 .fid = &fid,
1680 };
1681
1682 rc = CIFS_open(xid, &oparms, &oplock, NULL);
1683 if (rc != 0)
1684 goto out;
1685
1686 origattr = cifsInode->cifsAttrs;
1687 if (origattr == 0)
1688 origattr |= ATTR_NORMAL;
1689
1690 dosattr = origattr & ~ATTR_READONLY;
1691 if (dosattr == 0)
1692 dosattr |= ATTR_NORMAL;
1693 dosattr |= ATTR_HIDDEN;
1694
1695 /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
1696 if (dosattr != origattr) {
1697 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
1698 if (info_buf == NULL) {
1699 rc = -ENOMEM;
1700 goto out_close;
1701 }
1702 info_buf->Attributes = cpu_to_le32(dosattr);
1703 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid,
1704 current->tgid);
1705 /* although we would like to mark the file hidden
1706 if that fails we will still try to rename it */
1707 if (!rc)
1708 cifsInode->cifsAttrs = dosattr;
1709 else
1710 dosattr = origattr; /* since not able to change them */
1711 }
1712
1713 /* rename the file */
1714 rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, NULL,
1715 cifs_sb->local_nls,
1716 cifs_remap(cifs_sb));
1717 if (rc != 0) {
1718 rc = -EBUSY;
1719 goto undo_setattr;
1720 }
1721
1722 /* try to set DELETE_ON_CLOSE */
1723 if (!test_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags)) {
1724 rc = CIFSSMBSetFileDisposition(xid, tcon, true, fid.netfid,
1725 current->tgid);
1726 /*
1727 * some samba versions return -ENOENT when we try to set the
1728 * file disposition here. Likely a samba bug, but work around
1729 * it for now. This means that some cifsXXX files may hang
1730 * around after they shouldn't.
1731 *
1732 * BB: remove this hack after more servers have the fix
1733 */
1734 if (rc == -ENOENT)
1735 rc = 0;
1736 else if (rc != 0) {
1737 rc = -EBUSY;
1738 goto undo_rename;
1739 }
1740 set_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags);
1741 }
1742
1743out_close:
1744 CIFSSMBClose(xid, tcon, fid.netfid);
1745out:
1746 kfree(info_buf);
1747 cifs_put_tlink(tlink);
1748 return rc;
1749
1750 /*
1751 * reset everything back to the original state. Don't bother
1752 * dealing with errors here since we can't do anything about
1753 * them anyway.
1754 */
1755undo_rename:
1756 CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, dentry->d_name.name,
1757 cifs_sb->local_nls, cifs_remap(cifs_sb));
1758undo_setattr:
1759 if (dosattr != origattr) {
1760 info_buf->Attributes = cpu_to_le32(origattr);
1761 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid,
1762 current->tgid))
1763 cifsInode->cifsAttrs = origattr;
1764 }
1765
1766 goto out_close;
1767}
1768#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1769
1770/* copied from fs/nfs/dir.c with small changes */
1771static void
1772cifs_drop_nlink(struct inode *inode)
1773{
1774 spin_lock(&inode->i_lock);
1775 if (inode->i_nlink > 0)
1776 drop_nlink(inode);
1777 spin_unlock(&inode->i_lock);
1778}
1779
1780/*
1781 * If d_inode(dentry) is null (usually meaning the cached dentry
1782 * is a negative dentry) then we would attempt a standard SMB delete, but
1783 * if that fails we can not attempt the fall back mechanisms on EACCES
1784 * but will return the EACCES to the caller. Note that the VFS does not call
1785 * unlink on negative dentries currently.
1786 */
1787int cifs_unlink(struct inode *dir, struct dentry *dentry)
1788{
1789 int rc = 0;
1790 unsigned int xid;
1791 const char *full_path;
1792 void *page;
1793 struct inode *inode = d_inode(dentry);
1794 struct cifsInodeInfo *cifs_inode;
1795 struct super_block *sb = dir->i_sb;
1796 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1797 struct tcon_link *tlink;
1798 struct cifs_tcon *tcon;
1799 struct TCP_Server_Info *server;
1800 struct iattr *attrs = NULL;
1801 __u32 dosattr = 0, origattr = 0;
1802
1803 cifs_dbg(FYI, "cifs_unlink, dir=0x%p, dentry=0x%p\n", dir, dentry);
1804
1805 if (unlikely(cifs_forced_shutdown(cifs_sb)))
1806 return -EIO;
1807
1808 tlink = cifs_sb_tlink(cifs_sb);
1809 if (IS_ERR(tlink))
1810 return PTR_ERR(tlink);
1811 tcon = tlink_tcon(tlink);
1812 server = tcon->ses->server;
1813
1814 xid = get_xid();
1815 page = alloc_dentry_path();
1816
1817 if (tcon->nodelete) {
1818 rc = -EACCES;
1819 goto unlink_out;
1820 }
1821
1822 /* Unlink can be called from rename so we can not take the
1823 * sb->s_vfs_rename_mutex here */
1824 full_path = build_path_from_dentry(dentry, page);
1825 if (IS_ERR(full_path)) {
1826 rc = PTR_ERR(full_path);
1827 goto unlink_out;
1828 }
1829
1830 cifs_close_deferred_file_under_dentry(tcon, full_path);
1831#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1832 if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1833 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1834 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
1835 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
1836 cifs_remap(cifs_sb));
1837 cifs_dbg(FYI, "posix del rc %d\n", rc);
1838 if ((rc == 0) || (rc == -ENOENT))
1839 goto psx_del_no_retry;
1840 }
1841#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1842
1843retry_std_delete:
1844 if (!server->ops->unlink) {
1845 rc = -ENOSYS;
1846 goto psx_del_no_retry;
1847 }
1848
1849 rc = server->ops->unlink(xid, tcon, full_path, cifs_sb);
1850
1851psx_del_no_retry:
1852 if (!rc) {
1853 if (inode)
1854 cifs_drop_nlink(inode);
1855 } else if (rc == -ENOENT) {
1856 d_drop(dentry);
1857 } else if (rc == -EBUSY) {
1858 if (server->ops->rename_pending_delete) {
1859 rc = server->ops->rename_pending_delete(full_path,
1860 dentry, xid);
1861 if (rc == 0)
1862 cifs_drop_nlink(inode);
1863 }
1864 } else if ((rc == -EACCES) && (dosattr == 0) && inode) {
1865 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1866 if (attrs == NULL) {
1867 rc = -ENOMEM;
1868 goto out_reval;
1869 }
1870
1871 /* try to reset dos attributes */
1872 cifs_inode = CIFS_I(inode);
1873 origattr = cifs_inode->cifsAttrs;
1874 if (origattr == 0)
1875 origattr |= ATTR_NORMAL;
1876 dosattr = origattr & ~ATTR_READONLY;
1877 if (dosattr == 0)
1878 dosattr |= ATTR_NORMAL;
1879 dosattr |= ATTR_HIDDEN;
1880
1881 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1882 if (rc != 0)
1883 goto out_reval;
1884
1885 goto retry_std_delete;
1886 }
1887
1888 /* undo the setattr if we errored out and it's needed */
1889 if (rc != 0 && dosattr != 0)
1890 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
1891
1892out_reval:
1893 if (inode) {
1894 cifs_inode = CIFS_I(inode);
1895 cifs_inode->time = 0; /* will force revalidate to get info
1896 when needed */
1897 inode_set_ctime_current(inode);
1898 }
1899 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
1900 cifs_inode = CIFS_I(dir);
1901 CIFS_I(dir)->time = 0; /* force revalidate of dir as well */
1902unlink_out:
1903 free_dentry_path(page);
1904 kfree(attrs);
1905 free_xid(xid);
1906 cifs_put_tlink(tlink);
1907 return rc;
1908}
1909
1910static int
1911cifs_mkdir_qinfo(struct inode *parent, struct dentry *dentry, umode_t mode,
1912 const char *full_path, struct cifs_sb_info *cifs_sb,
1913 struct cifs_tcon *tcon, const unsigned int xid)
1914{
1915 int rc = 0;
1916 struct inode *inode = NULL;
1917
1918 if (tcon->posix_extensions) {
1919 rc = smb311_posix_get_inode_info(&inode, full_path,
1920 NULL, parent->i_sb, xid);
1921#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1922 } else if (tcon->unix_ext) {
1923 rc = cifs_get_inode_info_unix(&inode, full_path, parent->i_sb,
1924 xid);
1925#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1926 } else {
1927 rc = cifs_get_inode_info(&inode, full_path, NULL, parent->i_sb,
1928 xid, NULL);
1929 }
1930
1931 if (rc)
1932 return rc;
1933
1934 if (!S_ISDIR(inode->i_mode)) {
1935 /*
1936 * mkdir succeeded, but another client has managed to remove the
1937 * sucker and replace it with non-directory. Return success,
1938 * but don't leave the child in dcache.
1939 */
1940 iput(inode);
1941 d_drop(dentry);
1942 return 0;
1943 }
1944 /*
1945 * setting nlink not necessary except in cases where we failed to get it
1946 * from the server or was set bogus. Also, since this is a brand new
1947 * inode, no need to grab the i_lock before setting the i_nlink.
1948 */
1949 if (inode->i_nlink < 2)
1950 set_nlink(inode, 2);
1951 mode &= ~current_umask();
1952 /* must turn on setgid bit if parent dir has it */
1953 if (parent->i_mode & S_ISGID)
1954 mode |= S_ISGID;
1955
1956#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1957 if (tcon->unix_ext) {
1958 struct cifs_unix_set_info_args args = {
1959 .mode = mode,
1960 .ctime = NO_CHANGE_64,
1961 .atime = NO_CHANGE_64,
1962 .mtime = NO_CHANGE_64,
1963 .device = 0,
1964 };
1965 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1966 args.uid = current_fsuid();
1967 if (parent->i_mode & S_ISGID)
1968 args.gid = parent->i_gid;
1969 else
1970 args.gid = current_fsgid();
1971 } else {
1972 args.uid = INVALID_UID; /* no change */
1973 args.gid = INVALID_GID; /* no change */
1974 }
1975 CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
1976 cifs_sb->local_nls,
1977 cifs_remap(cifs_sb));
1978 } else {
1979#else
1980 {
1981#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1982 struct TCP_Server_Info *server = tcon->ses->server;
1983 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1984 (mode & S_IWUGO) == 0 && server->ops->mkdir_setinfo)
1985 server->ops->mkdir_setinfo(inode, full_path, cifs_sb,
1986 tcon, xid);
1987 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
1988 inode->i_mode = (mode | S_IFDIR);
1989
1990 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1991 inode->i_uid = current_fsuid();
1992 if (inode->i_mode & S_ISGID)
1993 inode->i_gid = parent->i_gid;
1994 else
1995 inode->i_gid = current_fsgid();
1996 }
1997 }
1998 d_instantiate(dentry, inode);
1999 return 0;
2000}
2001
2002#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2003static int
2004cifs_posix_mkdir(struct inode *inode, struct dentry *dentry, umode_t mode,
2005 const char *full_path, struct cifs_sb_info *cifs_sb,
2006 struct cifs_tcon *tcon, const unsigned int xid)
2007{
2008 int rc = 0;
2009 u32 oplock = 0;
2010 FILE_UNIX_BASIC_INFO *info = NULL;
2011 struct inode *newinode = NULL;
2012 struct cifs_fattr fattr;
2013
2014 info = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
2015 if (info == NULL) {
2016 rc = -ENOMEM;
2017 goto posix_mkdir_out;
2018 }
2019
2020 mode &= ~current_umask();
2021 rc = CIFSPOSIXCreate(xid, tcon, SMB_O_DIRECTORY | SMB_O_CREAT, mode,
2022 NULL /* netfid */, info, &oplock, full_path,
2023 cifs_sb->local_nls, cifs_remap(cifs_sb));
2024 if (rc == -EOPNOTSUPP)
2025 goto posix_mkdir_out;
2026 else if (rc) {
2027 cifs_dbg(FYI, "posix mkdir returned 0x%x\n", rc);
2028 d_drop(dentry);
2029 goto posix_mkdir_out;
2030 }
2031
2032 if (info->Type == cpu_to_le32(-1))
2033 /* no return info, go query for it */
2034 goto posix_mkdir_get_info;
2035 /*
2036 * BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if
2037 * need to set uid/gid.
2038 */
2039
2040 cifs_unix_basic_to_fattr(&fattr, info, cifs_sb);
2041 cifs_fill_uniqueid(inode->i_sb, &fattr);
2042 newinode = cifs_iget(inode->i_sb, &fattr);
2043 if (!newinode)
2044 goto posix_mkdir_get_info;
2045
2046 d_instantiate(dentry, newinode);
2047
2048#ifdef CONFIG_CIFS_DEBUG2
2049 cifs_dbg(FYI, "instantiated dentry %p %pd to inode %p\n",
2050 dentry, dentry, newinode);
2051
2052 if (newinode->i_nlink != 2)
2053 cifs_dbg(FYI, "unexpected number of links %d\n",
2054 newinode->i_nlink);
2055#endif
2056
2057posix_mkdir_out:
2058 kfree(info);
2059 return rc;
2060posix_mkdir_get_info:
2061 rc = cifs_mkdir_qinfo(inode, dentry, mode, full_path, cifs_sb, tcon,
2062 xid);
2063 goto posix_mkdir_out;
2064}
2065#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2066
2067int cifs_mkdir(struct mnt_idmap *idmap, struct inode *inode,
2068 struct dentry *direntry, umode_t mode)
2069{
2070 int rc = 0;
2071 unsigned int xid;
2072 struct cifs_sb_info *cifs_sb;
2073 struct tcon_link *tlink;
2074 struct cifs_tcon *tcon;
2075 struct TCP_Server_Info *server;
2076 const char *full_path;
2077 void *page;
2078
2079 cifs_dbg(FYI, "In cifs_mkdir, mode = %04ho inode = 0x%p\n",
2080 mode, inode);
2081
2082 cifs_sb = CIFS_SB(inode->i_sb);
2083 if (unlikely(cifs_forced_shutdown(cifs_sb)))
2084 return -EIO;
2085 tlink = cifs_sb_tlink(cifs_sb);
2086 if (IS_ERR(tlink))
2087 return PTR_ERR(tlink);
2088 tcon = tlink_tcon(tlink);
2089
2090 xid = get_xid();
2091
2092 page = alloc_dentry_path();
2093 full_path = build_path_from_dentry(direntry, page);
2094 if (IS_ERR(full_path)) {
2095 rc = PTR_ERR(full_path);
2096 goto mkdir_out;
2097 }
2098
2099 server = tcon->ses->server;
2100
2101 if ((server->ops->posix_mkdir) && (tcon->posix_extensions)) {
2102 rc = server->ops->posix_mkdir(xid, inode, mode, tcon, full_path,
2103 cifs_sb);
2104 d_drop(direntry); /* for time being always refresh inode info */
2105 goto mkdir_out;
2106 }
2107
2108#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2109 if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
2110 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
2111 rc = cifs_posix_mkdir(inode, direntry, mode, full_path, cifs_sb,
2112 tcon, xid);
2113 if (rc != -EOPNOTSUPP)
2114 goto mkdir_out;
2115 }
2116#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2117
2118 if (!server->ops->mkdir) {
2119 rc = -ENOSYS;
2120 goto mkdir_out;
2121 }
2122
2123 /* BB add setting the equivalent of mode via CreateX w/ACLs */
2124 rc = server->ops->mkdir(xid, inode, mode, tcon, full_path, cifs_sb);
2125 if (rc) {
2126 cifs_dbg(FYI, "cifs_mkdir returned 0x%x\n", rc);
2127 d_drop(direntry);
2128 goto mkdir_out;
2129 }
2130
2131 /* TODO: skip this for smb2/smb3 */
2132 rc = cifs_mkdir_qinfo(inode, direntry, mode, full_path, cifs_sb, tcon,
2133 xid);
2134mkdir_out:
2135 /*
2136 * Force revalidate to get parent dir info when needed since cached
2137 * attributes are invalid now.
2138 */
2139 CIFS_I(inode)->time = 0;
2140 free_dentry_path(page);
2141 free_xid(xid);
2142 cifs_put_tlink(tlink);
2143 return rc;
2144}
2145
2146int cifs_rmdir(struct inode *inode, struct dentry *direntry)
2147{
2148 int rc = 0;
2149 unsigned int xid;
2150 struct cifs_sb_info *cifs_sb;
2151 struct tcon_link *tlink;
2152 struct cifs_tcon *tcon;
2153 struct TCP_Server_Info *server;
2154 const char *full_path;
2155 void *page = alloc_dentry_path();
2156 struct cifsInodeInfo *cifsInode;
2157
2158 cifs_dbg(FYI, "cifs_rmdir, inode = 0x%p\n", inode);
2159
2160 xid = get_xid();
2161
2162 full_path = build_path_from_dentry(direntry, page);
2163 if (IS_ERR(full_path)) {
2164 rc = PTR_ERR(full_path);
2165 goto rmdir_exit;
2166 }
2167
2168 cifs_sb = CIFS_SB(inode->i_sb);
2169 if (unlikely(cifs_forced_shutdown(cifs_sb))) {
2170 rc = -EIO;
2171 goto rmdir_exit;
2172 }
2173
2174 tlink = cifs_sb_tlink(cifs_sb);
2175 if (IS_ERR(tlink)) {
2176 rc = PTR_ERR(tlink);
2177 goto rmdir_exit;
2178 }
2179 tcon = tlink_tcon(tlink);
2180 server = tcon->ses->server;
2181
2182 if (!server->ops->rmdir) {
2183 rc = -ENOSYS;
2184 cifs_put_tlink(tlink);
2185 goto rmdir_exit;
2186 }
2187
2188 if (tcon->nodelete) {
2189 rc = -EACCES;
2190 cifs_put_tlink(tlink);
2191 goto rmdir_exit;
2192 }
2193
2194 rc = server->ops->rmdir(xid, tcon, full_path, cifs_sb);
2195 cifs_put_tlink(tlink);
2196
2197 if (!rc) {
2198 spin_lock(&d_inode(direntry)->i_lock);
2199 i_size_write(d_inode(direntry), 0);
2200 clear_nlink(d_inode(direntry));
2201 spin_unlock(&d_inode(direntry)->i_lock);
2202 }
2203
2204 cifsInode = CIFS_I(d_inode(direntry));
2205 /* force revalidate to go get info when needed */
2206 cifsInode->time = 0;
2207
2208 cifsInode = CIFS_I(inode);
2209 /*
2210 * Force revalidate to get parent dir info when needed since cached
2211 * attributes are invalid now.
2212 */
2213 cifsInode->time = 0;
2214
2215 inode_set_ctime_current(d_inode(direntry));
2216 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
2217
2218rmdir_exit:
2219 free_dentry_path(page);
2220 free_xid(xid);
2221 return rc;
2222}
2223
2224static int
2225cifs_do_rename(const unsigned int xid, struct dentry *from_dentry,
2226 const char *from_path, struct dentry *to_dentry,
2227 const char *to_path)
2228{
2229 struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
2230 struct tcon_link *tlink;
2231 struct cifs_tcon *tcon;
2232 struct TCP_Server_Info *server;
2233#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2234 struct cifs_fid fid;
2235 struct cifs_open_parms oparms;
2236 int oplock;
2237#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2238 int rc;
2239
2240 tlink = cifs_sb_tlink(cifs_sb);
2241 if (IS_ERR(tlink))
2242 return PTR_ERR(tlink);
2243 tcon = tlink_tcon(tlink);
2244 server = tcon->ses->server;
2245
2246 if (!server->ops->rename)
2247 return -ENOSYS;
2248
2249 /* try path-based rename first */
2250 rc = server->ops->rename(xid, tcon, from_dentry,
2251 from_path, to_path, cifs_sb);
2252
2253 /*
2254 * Don't bother with rename by filehandle unless file is busy and
2255 * source. Note that cross directory moves do not work with
2256 * rename by filehandle to various Windows servers.
2257 */
2258 if (rc == 0 || rc != -EBUSY)
2259 goto do_rename_exit;
2260
2261 /* Don't fall back to using SMB on SMB 2+ mount */
2262 if (server->vals->protocol_id != 0)
2263 goto do_rename_exit;
2264
2265#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2266 /* open-file renames don't work across directories */
2267 if (to_dentry->d_parent != from_dentry->d_parent)
2268 goto do_rename_exit;
2269
2270 oparms = (struct cifs_open_parms) {
2271 .tcon = tcon,
2272 .cifs_sb = cifs_sb,
2273 /* open the file to be renamed -- we need DELETE perms */
2274 .desired_access = DELETE,
2275 .create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),
2276 .disposition = FILE_OPEN,
2277 .path = from_path,
2278 .fid = &fid,
2279 };
2280
2281 rc = CIFS_open(xid, &oparms, &oplock, NULL);
2282 if (rc == 0) {
2283 rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid,
2284 (const char *) to_dentry->d_name.name,
2285 cifs_sb->local_nls, cifs_remap(cifs_sb));
2286 CIFSSMBClose(xid, tcon, fid.netfid);
2287 }
2288#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2289do_rename_exit:
2290 if (rc == 0)
2291 d_move(from_dentry, to_dentry);
2292 cifs_put_tlink(tlink);
2293 return rc;
2294}
2295
2296int
2297cifs_rename2(struct mnt_idmap *idmap, struct inode *source_dir,
2298 struct dentry *source_dentry, struct inode *target_dir,
2299 struct dentry *target_dentry, unsigned int flags)
2300{
2301 const char *from_name, *to_name;
2302 void *page1, *page2;
2303 struct cifs_sb_info *cifs_sb;
2304 struct tcon_link *tlink;
2305 struct cifs_tcon *tcon;
2306 unsigned int xid;
2307 int rc, tmprc;
2308 int retry_count = 0;
2309 FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
2310#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2311 FILE_UNIX_BASIC_INFO *info_buf_target;
2312#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2313
2314 if (flags & ~RENAME_NOREPLACE)
2315 return -EINVAL;
2316
2317 cifs_sb = CIFS_SB(source_dir->i_sb);
2318 if (unlikely(cifs_forced_shutdown(cifs_sb)))
2319 return -EIO;
2320
2321 tlink = cifs_sb_tlink(cifs_sb);
2322 if (IS_ERR(tlink))
2323 return PTR_ERR(tlink);
2324 tcon = tlink_tcon(tlink);
2325
2326 page1 = alloc_dentry_path();
2327 page2 = alloc_dentry_path();
2328 xid = get_xid();
2329
2330 from_name = build_path_from_dentry(source_dentry, page1);
2331 if (IS_ERR(from_name)) {
2332 rc = PTR_ERR(from_name);
2333 goto cifs_rename_exit;
2334 }
2335
2336 to_name = build_path_from_dentry(target_dentry, page2);
2337 if (IS_ERR(to_name)) {
2338 rc = PTR_ERR(to_name);
2339 goto cifs_rename_exit;
2340 }
2341
2342 cifs_close_deferred_file_under_dentry(tcon, from_name);
2343 if (d_inode(target_dentry) != NULL)
2344 cifs_close_deferred_file_under_dentry(tcon, to_name);
2345
2346 rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
2347 to_name);
2348
2349 if (rc == -EACCES) {
2350 while (retry_count < 3) {
2351 cifs_close_all_deferred_files(tcon);
2352 rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
2353 to_name);
2354 if (rc != -EACCES)
2355 break;
2356 retry_count++;
2357 }
2358 }
2359
2360 /*
2361 * No-replace is the natural behavior for CIFS, so skip unlink hacks.
2362 */
2363 if (flags & RENAME_NOREPLACE)
2364 goto cifs_rename_exit;
2365
2366#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2367 if (rc == -EEXIST && tcon->unix_ext) {
2368 /*
2369 * Are src and dst hardlinks of same inode? We can only tell
2370 * with unix extensions enabled.
2371 */
2372 info_buf_source =
2373 kmalloc_array(2, sizeof(FILE_UNIX_BASIC_INFO),
2374 GFP_KERNEL);
2375 if (info_buf_source == NULL) {
2376 rc = -ENOMEM;
2377 goto cifs_rename_exit;
2378 }
2379
2380 info_buf_target = info_buf_source + 1;
2381 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, from_name,
2382 info_buf_source,
2383 cifs_sb->local_nls,
2384 cifs_remap(cifs_sb));
2385 if (tmprc != 0)
2386 goto unlink_target;
2387
2388 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, to_name,
2389 info_buf_target,
2390 cifs_sb->local_nls,
2391 cifs_remap(cifs_sb));
2392
2393 if (tmprc == 0 && (info_buf_source->UniqueId ==
2394 info_buf_target->UniqueId)) {
2395 /* same file, POSIX says that this is a noop */
2396 rc = 0;
2397 goto cifs_rename_exit;
2398 }
2399 }
2400 /*
2401 * else ... BB we could add the same check for Windows by
2402 * checking the UniqueId via FILE_INTERNAL_INFO
2403 */
2404
2405unlink_target:
2406#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2407
2408 /* Try unlinking the target dentry if it's not negative */
2409 if (d_really_is_positive(target_dentry) && (rc == -EACCES || rc == -EEXIST)) {
2410 if (d_is_dir(target_dentry))
2411 tmprc = cifs_rmdir(target_dir, target_dentry);
2412 else
2413 tmprc = cifs_unlink(target_dir, target_dentry);
2414 if (tmprc)
2415 goto cifs_rename_exit;
2416 rc = cifs_do_rename(xid, source_dentry, from_name,
2417 target_dentry, to_name);
2418 }
2419
2420 /* force revalidate to go get info when needed */
2421 CIFS_I(source_dir)->time = CIFS_I(target_dir)->time = 0;
2422
2423cifs_rename_exit:
2424 kfree(info_buf_source);
2425 free_dentry_path(page2);
2426 free_dentry_path(page1);
2427 free_xid(xid);
2428 cifs_put_tlink(tlink);
2429 return rc;
2430}
2431
2432static bool
2433cifs_dentry_needs_reval(struct dentry *dentry)
2434{
2435 struct inode *inode = d_inode(dentry);
2436 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
2437 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2438 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
2439 struct cached_fid *cfid = NULL;
2440
2441 if (cifs_i->time == 0)
2442 return true;
2443
2444 if (CIFS_CACHE_READ(cifs_i))
2445 return false;
2446
2447 if (!lookupCacheEnabled)
2448 return true;
2449
2450 if (!open_cached_dir_by_dentry(tcon, dentry->d_parent, &cfid)) {
2451 spin_lock(&cfid->fid_lock);
2452 if (cfid->time && cifs_i->time > cfid->time) {
2453 spin_unlock(&cfid->fid_lock);
2454 close_cached_dir(cfid);
2455 return false;
2456 }
2457 spin_unlock(&cfid->fid_lock);
2458 close_cached_dir(cfid);
2459 }
2460 /*
2461 * depending on inode type, check if attribute caching disabled for
2462 * files or directories
2463 */
2464 if (S_ISDIR(inode->i_mode)) {
2465 if (!cifs_sb->ctx->acdirmax)
2466 return true;
2467 if (!time_in_range(jiffies, cifs_i->time,
2468 cifs_i->time + cifs_sb->ctx->acdirmax))
2469 return true;
2470 } else { /* file */
2471 if (!cifs_sb->ctx->acregmax)
2472 return true;
2473 if (!time_in_range(jiffies, cifs_i->time,
2474 cifs_i->time + cifs_sb->ctx->acregmax))
2475 return true;
2476 }
2477
2478 /* hardlinked files w/ noserverino get "special" treatment */
2479 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
2480 S_ISREG(inode->i_mode) && inode->i_nlink != 1)
2481 return true;
2482
2483 return false;
2484}
2485
2486/*
2487 * Zap the cache. Called when invalid_mapping flag is set.
2488 */
2489int
2490cifs_invalidate_mapping(struct inode *inode)
2491{
2492 int rc = 0;
2493
2494 if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
2495 rc = invalidate_inode_pages2(inode->i_mapping);
2496 if (rc)
2497 cifs_dbg(VFS, "%s: invalidate inode %p failed with rc %d\n",
2498 __func__, inode, rc);
2499 }
2500
2501 return rc;
2502}
2503
2504/**
2505 * cifs_wait_bit_killable - helper for functions that are sleeping on bit locks
2506 *
2507 * @key: currently unused
2508 * @mode: the task state to sleep in
2509 */
2510static int
2511cifs_wait_bit_killable(struct wait_bit_key *key, int mode)
2512{
2513 schedule();
2514 if (signal_pending_state(mode, current))
2515 return -ERESTARTSYS;
2516 return 0;
2517}
2518
2519int
2520cifs_revalidate_mapping(struct inode *inode)
2521{
2522 int rc;
2523 unsigned long *flags = &CIFS_I(inode)->flags;
2524 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2525
2526 /* swapfiles are not supposed to be shared */
2527 if (IS_SWAPFILE(inode))
2528 return 0;
2529
2530 rc = wait_on_bit_lock_action(flags, CIFS_INO_LOCK, cifs_wait_bit_killable,
2531 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
2532 if (rc)
2533 return rc;
2534
2535 if (test_and_clear_bit(CIFS_INO_INVALID_MAPPING, flags)) {
2536 /* for cache=singleclient, do not invalidate */
2537 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
2538 goto skip_invalidate;
2539
2540 rc = cifs_invalidate_mapping(inode);
2541 if (rc)
2542 set_bit(CIFS_INO_INVALID_MAPPING, flags);
2543 }
2544
2545skip_invalidate:
2546 clear_bit_unlock(CIFS_INO_LOCK, flags);
2547 smp_mb__after_atomic();
2548 wake_up_bit(flags, CIFS_INO_LOCK);
2549
2550 return rc;
2551}
2552
2553int
2554cifs_zap_mapping(struct inode *inode)
2555{
2556 set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(inode)->flags);
2557 return cifs_revalidate_mapping(inode);
2558}
2559
2560int cifs_revalidate_file_attr(struct file *filp)
2561{
2562 int rc = 0;
2563 struct dentry *dentry = file_dentry(filp);
2564#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2565 struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
2566#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2567
2568 if (!cifs_dentry_needs_reval(dentry))
2569 return rc;
2570
2571#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2572 if (tlink_tcon(cfile->tlink)->unix_ext)
2573 rc = cifs_get_file_info_unix(filp);
2574 else
2575#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2576 rc = cifs_get_file_info(filp);
2577
2578 return rc;
2579}
2580
2581int cifs_revalidate_dentry_attr(struct dentry *dentry)
2582{
2583 unsigned int xid;
2584 int rc = 0;
2585 struct inode *inode = d_inode(dentry);
2586 struct super_block *sb = dentry->d_sb;
2587 const char *full_path;
2588 void *page;
2589 int count = 0;
2590
2591 if (inode == NULL)
2592 return -ENOENT;
2593
2594 if (!cifs_dentry_needs_reval(dentry))
2595 return rc;
2596
2597 xid = get_xid();
2598
2599 page = alloc_dentry_path();
2600 full_path = build_path_from_dentry(dentry, page);
2601 if (IS_ERR(full_path)) {
2602 rc = PTR_ERR(full_path);
2603 goto out;
2604 }
2605
2606 cifs_dbg(FYI, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time %ld jiffies %ld\n",
2607 full_path, inode, inode->i_count.counter,
2608 dentry, cifs_get_time(dentry), jiffies);
2609
2610again:
2611 if (cifs_sb_master_tcon(CIFS_SB(sb))->posix_extensions) {
2612 rc = smb311_posix_get_inode_info(&inode, full_path,
2613 NULL, sb, xid);
2614 } else if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext) {
2615 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
2616 } else {
2617 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
2618 xid, NULL);
2619 }
2620 if (rc == -EAGAIN && count++ < 10)
2621 goto again;
2622out:
2623 free_dentry_path(page);
2624 free_xid(xid);
2625
2626 return rc;
2627}
2628
2629int cifs_revalidate_file(struct file *filp)
2630{
2631 int rc;
2632 struct inode *inode = file_inode(filp);
2633
2634 rc = cifs_revalidate_file_attr(filp);
2635 if (rc)
2636 return rc;
2637
2638 return cifs_revalidate_mapping(inode);
2639}
2640
2641/* revalidate a dentry's inode attributes */
2642int cifs_revalidate_dentry(struct dentry *dentry)
2643{
2644 int rc;
2645 struct inode *inode = d_inode(dentry);
2646
2647 rc = cifs_revalidate_dentry_attr(dentry);
2648 if (rc)
2649 return rc;
2650
2651 return cifs_revalidate_mapping(inode);
2652}
2653
2654int cifs_getattr(struct mnt_idmap *idmap, const struct path *path,
2655 struct kstat *stat, u32 request_mask, unsigned int flags)
2656{
2657 struct dentry *dentry = path->dentry;
2658 struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
2659 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
2660 struct inode *inode = d_inode(dentry);
2661 int rc;
2662
2663 if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb))))
2664 return -EIO;
2665
2666 /*
2667 * We need to be sure that all dirty pages are written and the server
2668 * has actual ctime, mtime and file length.
2669 */
2670 if ((request_mask & (STATX_CTIME | STATX_MTIME | STATX_SIZE | STATX_BLOCKS)) &&
2671 !CIFS_CACHE_READ(CIFS_I(inode)) &&
2672 inode->i_mapping && inode->i_mapping->nrpages != 0) {
2673 rc = filemap_fdatawait(inode->i_mapping);
2674 if (rc) {
2675 mapping_set_error(inode->i_mapping, rc);
2676 return rc;
2677 }
2678 }
2679
2680 if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_FORCE_SYNC)
2681 CIFS_I(inode)->time = 0; /* force revalidate */
2682
2683 /*
2684 * If the caller doesn't require syncing, only sync if
2685 * necessary (e.g. due to earlier truncate or setattr
2686 * invalidating the cached metadata)
2687 */
2688 if (((flags & AT_STATX_SYNC_TYPE) != AT_STATX_DONT_SYNC) ||
2689 (CIFS_I(inode)->time == 0)) {
2690 rc = cifs_revalidate_dentry_attr(dentry);
2691 if (rc)
2692 return rc;
2693 }
2694
2695 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
2696 stat->blksize = cifs_sb->ctx->bsize;
2697 stat->ino = CIFS_I(inode)->uniqueid;
2698
2699 /* old CIFS Unix Extensions doesn't return create time */
2700 if (CIFS_I(inode)->createtime) {
2701 stat->result_mask |= STATX_BTIME;
2702 stat->btime =
2703 cifs_NTtimeToUnix(cpu_to_le64(CIFS_I(inode)->createtime));
2704 }
2705
2706 stat->attributes_mask |= (STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED);
2707 if (CIFS_I(inode)->cifsAttrs & FILE_ATTRIBUTE_COMPRESSED)
2708 stat->attributes |= STATX_ATTR_COMPRESSED;
2709 if (CIFS_I(inode)->cifsAttrs & FILE_ATTRIBUTE_ENCRYPTED)
2710 stat->attributes |= STATX_ATTR_ENCRYPTED;
2711
2712 /*
2713 * If on a multiuser mount without unix extensions or cifsacl being
2714 * enabled, and the admin hasn't overridden them, set the ownership
2715 * to the fsuid/fsgid of the current process.
2716 */
2717 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
2718 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
2719 !tcon->unix_ext) {
2720 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
2721 stat->uid = current_fsuid();
2722 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
2723 stat->gid = current_fsgid();
2724 }
2725 return 0;
2726}
2727
2728int cifs_fiemap(struct inode *inode, struct fiemap_extent_info *fei, u64 start,
2729 u64 len)
2730{
2731 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
2732 struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_i->netfs.inode.i_sb);
2733 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
2734 struct TCP_Server_Info *server = tcon->ses->server;
2735 struct cifsFileInfo *cfile;
2736 int rc;
2737
2738 if (unlikely(cifs_forced_shutdown(cifs_sb)))
2739 return -EIO;
2740
2741 /*
2742 * We need to be sure that all dirty pages are written as they
2743 * might fill holes on the server.
2744 */
2745 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
2746 inode->i_mapping->nrpages != 0) {
2747 rc = filemap_fdatawait(inode->i_mapping);
2748 if (rc) {
2749 mapping_set_error(inode->i_mapping, rc);
2750 return rc;
2751 }
2752 }
2753
2754 cfile = find_readable_file(cifs_i, false);
2755 if (cfile == NULL)
2756 return -EINVAL;
2757
2758 if (server->ops->fiemap) {
2759 rc = server->ops->fiemap(tcon, cfile, fei, start, len);
2760 cifsFileInfo_put(cfile);
2761 return rc;
2762 }
2763
2764 cifsFileInfo_put(cfile);
2765 return -EOPNOTSUPP;
2766}
2767
2768int cifs_truncate_page(struct address_space *mapping, loff_t from)
2769{
2770 pgoff_t index = from >> PAGE_SHIFT;
2771 unsigned offset = from & (PAGE_SIZE - 1);
2772 struct page *page;
2773 int rc = 0;
2774
2775 page = grab_cache_page(mapping, index);
2776 if (!page)
2777 return -ENOMEM;
2778
2779 zero_user_segment(page, offset, PAGE_SIZE);
2780 unlock_page(page);
2781 put_page(page);
2782 return rc;
2783}
2784
2785void cifs_setsize(struct inode *inode, loff_t offset)
2786{
2787 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
2788
2789 spin_lock(&inode->i_lock);
2790 i_size_write(inode, offset);
2791 spin_unlock(&inode->i_lock);
2792
2793 /* Cached inode must be refreshed on truncate */
2794 cifs_i->time = 0;
2795 truncate_pagecache(inode, offset);
2796}
2797
2798static int
2799cifs_set_file_size(struct inode *inode, struct iattr *attrs,
2800 unsigned int xid, const char *full_path)
2801{
2802 int rc;
2803 struct cifsFileInfo *open_file;
2804 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2805 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2806 struct tcon_link *tlink = NULL;
2807 struct cifs_tcon *tcon = NULL;
2808 struct TCP_Server_Info *server;
2809
2810 /*
2811 * To avoid spurious oplock breaks from server, in the case of
2812 * inodes that we already have open, avoid doing path based
2813 * setting of file size if we can do it by handle.
2814 * This keeps our caching token (oplock) and avoids timeouts
2815 * when the local oplock break takes longer to flush
2816 * writebehind data than the SMB timeout for the SetPathInfo
2817 * request would allow
2818 */
2819 open_file = find_writable_file(cifsInode, FIND_WR_FSUID_ONLY);
2820 if (open_file) {
2821 tcon = tlink_tcon(open_file->tlink);
2822 server = tcon->ses->server;
2823 if (server->ops->set_file_size)
2824 rc = server->ops->set_file_size(xid, tcon, open_file,
2825 attrs->ia_size, false);
2826 else
2827 rc = -ENOSYS;
2828 cifsFileInfo_put(open_file);
2829 cifs_dbg(FYI, "SetFSize for attrs rc = %d\n", rc);
2830 } else
2831 rc = -EINVAL;
2832
2833 if (!rc)
2834 goto set_size_out;
2835
2836 if (tcon == NULL) {
2837 tlink = cifs_sb_tlink(cifs_sb);
2838 if (IS_ERR(tlink))
2839 return PTR_ERR(tlink);
2840 tcon = tlink_tcon(tlink);
2841 server = tcon->ses->server;
2842 }
2843
2844 /*
2845 * Set file size by pathname rather than by handle either because no
2846 * valid, writeable file handle for it was found or because there was
2847 * an error setting it by handle.
2848 */
2849 if (server->ops->set_path_size)
2850 rc = server->ops->set_path_size(xid, tcon, full_path,
2851 attrs->ia_size, cifs_sb, false);
2852 else
2853 rc = -ENOSYS;
2854 cifs_dbg(FYI, "SetEOF by path (setattrs) rc = %d\n", rc);
2855
2856 if (tlink)
2857 cifs_put_tlink(tlink);
2858
2859set_size_out:
2860 if (rc == 0) {
2861 netfs_resize_file(&cifsInode->netfs, attrs->ia_size, true);
2862 cifs_setsize(inode, attrs->ia_size);
2863 /*
2864 * i_blocks is not related to (i_size / i_blksize), but instead
2865 * 512 byte (2**9) size is required for calculating num blocks.
2866 * Until we can query the server for actual allocation size,
2867 * this is best estimate we have for blocks allocated for a file
2868 * Number of blocks must be rounded up so size 1 is not 0 blocks
2869 */
2870 inode->i_blocks = (512 - 1 + attrs->ia_size) >> 9;
2871
2872 /*
2873 * The man page of truncate says if the size changed,
2874 * then the st_ctime and st_mtime fields for the file
2875 * are updated.
2876 */
2877 attrs->ia_ctime = attrs->ia_mtime = current_time(inode);
2878 attrs->ia_valid |= ATTR_CTIME | ATTR_MTIME;
2879
2880 cifs_truncate_page(inode->i_mapping, inode->i_size);
2881 }
2882
2883 return rc;
2884}
2885
2886#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2887static int
2888cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
2889{
2890 int rc;
2891 unsigned int xid;
2892 const char *full_path;
2893 void *page = alloc_dentry_path();
2894 struct inode *inode = d_inode(direntry);
2895 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2896 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2897 struct tcon_link *tlink;
2898 struct cifs_tcon *pTcon;
2899 struct cifs_unix_set_info_args *args = NULL;
2900 struct cifsFileInfo *open_file;
2901
2902 cifs_dbg(FYI, "setattr_unix on file %pd attrs->ia_valid=0x%x\n",
2903 direntry, attrs->ia_valid);
2904
2905 xid = get_xid();
2906
2907 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2908 attrs->ia_valid |= ATTR_FORCE;
2909
2910 rc = setattr_prepare(&nop_mnt_idmap, direntry, attrs);
2911 if (rc < 0)
2912 goto out;
2913
2914 full_path = build_path_from_dentry(direntry, page);
2915 if (IS_ERR(full_path)) {
2916 rc = PTR_ERR(full_path);
2917 goto out;
2918 }
2919
2920 /*
2921 * Attempt to flush data before changing attributes. We need to do
2922 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2923 * ownership or mode then we may also need to do this. Here, we take
2924 * the safe way out and just do the flush on all setattr requests. If
2925 * the flush returns error, store it to report later and continue.
2926 *
2927 * BB: This should be smarter. Why bother flushing pages that
2928 * will be truncated anyway? Also, should we error out here if
2929 * the flush returns error?
2930 */
2931 rc = filemap_write_and_wait(inode->i_mapping);
2932 if (is_interrupt_error(rc)) {
2933 rc = -ERESTARTSYS;
2934 goto out;
2935 }
2936
2937 mapping_set_error(inode->i_mapping, rc);
2938 rc = 0;
2939
2940 if (attrs->ia_valid & ATTR_SIZE) {
2941 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2942 if (rc != 0)
2943 goto out;
2944 }
2945
2946 /* skip mode change if it's just for clearing setuid/setgid */
2947 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2948 attrs->ia_valid &= ~ATTR_MODE;
2949
2950 args = kmalloc(sizeof(*args), GFP_KERNEL);
2951 if (args == NULL) {
2952 rc = -ENOMEM;
2953 goto out;
2954 }
2955
2956 /* set up the struct */
2957 if (attrs->ia_valid & ATTR_MODE)
2958 args->mode = attrs->ia_mode;
2959 else
2960 args->mode = NO_CHANGE_64;
2961
2962 if (attrs->ia_valid & ATTR_UID)
2963 args->uid = attrs->ia_uid;
2964 else
2965 args->uid = INVALID_UID; /* no change */
2966
2967 if (attrs->ia_valid & ATTR_GID)
2968 args->gid = attrs->ia_gid;
2969 else
2970 args->gid = INVALID_GID; /* no change */
2971
2972 if (attrs->ia_valid & ATTR_ATIME)
2973 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
2974 else
2975 args->atime = NO_CHANGE_64;
2976
2977 if (attrs->ia_valid & ATTR_MTIME)
2978 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
2979 else
2980 args->mtime = NO_CHANGE_64;
2981
2982 if (attrs->ia_valid & ATTR_CTIME)
2983 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
2984 else
2985 args->ctime = NO_CHANGE_64;
2986
2987 args->device = 0;
2988 open_file = find_writable_file(cifsInode, FIND_WR_FSUID_ONLY);
2989 if (open_file) {
2990 u16 nfid = open_file->fid.netfid;
2991 u32 npid = open_file->pid;
2992 pTcon = tlink_tcon(open_file->tlink);
2993 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
2994 cifsFileInfo_put(open_file);
2995 } else {
2996 tlink = cifs_sb_tlink(cifs_sb);
2997 if (IS_ERR(tlink)) {
2998 rc = PTR_ERR(tlink);
2999 goto out;
3000 }
3001 pTcon = tlink_tcon(tlink);
3002 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
3003 cifs_sb->local_nls,
3004 cifs_remap(cifs_sb));
3005 cifs_put_tlink(tlink);
3006 }
3007
3008 if (rc)
3009 goto out;
3010
3011 if ((attrs->ia_valid & ATTR_SIZE) &&
3012 attrs->ia_size != i_size_read(inode)) {
3013 truncate_setsize(inode, attrs->ia_size);
3014 netfs_resize_file(&cifsInode->netfs, attrs->ia_size, true);
3015 fscache_resize_cookie(cifs_inode_cookie(inode), attrs->ia_size);
3016 }
3017
3018 setattr_copy(&nop_mnt_idmap, inode, attrs);
3019 mark_inode_dirty(inode);
3020
3021 /* force revalidate when any of these times are set since some
3022 of the fs types (eg ext3, fat) do not have fine enough
3023 time granularity to match protocol, and we do not have a
3024 a way (yet) to query the server fs's time granularity (and
3025 whether it rounds times down).
3026 */
3027 if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
3028 cifsInode->time = 0;
3029out:
3030 kfree(args);
3031 free_dentry_path(page);
3032 free_xid(xid);
3033 return rc;
3034}
3035#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3036
3037static int
3038cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
3039{
3040 unsigned int xid;
3041 kuid_t uid = INVALID_UID;
3042 kgid_t gid = INVALID_GID;
3043 struct inode *inode = d_inode(direntry);
3044 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
3045 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
3046 struct cifsFileInfo *wfile;
3047 struct cifs_tcon *tcon;
3048 const char *full_path;
3049 void *page = alloc_dentry_path();
3050 int rc = -EACCES;
3051 __u32 dosattr = 0;
3052 __u64 mode = NO_CHANGE_64;
3053
3054 xid = get_xid();
3055
3056 cifs_dbg(FYI, "setattr on file %pd attrs->ia_valid 0x%x\n",
3057 direntry, attrs->ia_valid);
3058
3059 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
3060 attrs->ia_valid |= ATTR_FORCE;
3061
3062 rc = setattr_prepare(&nop_mnt_idmap, direntry, attrs);
3063 if (rc < 0)
3064 goto cifs_setattr_exit;
3065
3066 full_path = build_path_from_dentry(direntry, page);
3067 if (IS_ERR(full_path)) {
3068 rc = PTR_ERR(full_path);
3069 goto cifs_setattr_exit;
3070 }
3071
3072 /*
3073 * Attempt to flush data before changing attributes. We need to do
3074 * this for ATTR_SIZE and ATTR_MTIME. If the flush of the data
3075 * returns error, store it to report later and continue.
3076 *
3077 * BB: This should be smarter. Why bother flushing pages that
3078 * will be truncated anyway? Also, should we error out here if
3079 * the flush returns error? Do we need to check for ATTR_MTIME_SET flag?
3080 */
3081 if (attrs->ia_valid & (ATTR_MTIME | ATTR_SIZE | ATTR_CTIME)) {
3082 rc = filemap_write_and_wait(inode->i_mapping);
3083 if (is_interrupt_error(rc)) {
3084 rc = -ERESTARTSYS;
3085 goto cifs_setattr_exit;
3086 }
3087 mapping_set_error(inode->i_mapping, rc);
3088 }
3089
3090 rc = 0;
3091
3092 if ((attrs->ia_valid & ATTR_MTIME) &&
3093 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) {
3094 rc = cifs_get_writable_file(cifsInode, FIND_WR_ANY, &wfile);
3095 if (!rc) {
3096 tcon = tlink_tcon(wfile->tlink);
3097 rc = tcon->ses->server->ops->flush(xid, tcon, &wfile->fid);
3098 cifsFileInfo_put(wfile);
3099 if (rc)
3100 goto cifs_setattr_exit;
3101 } else if (rc != -EBADF)
3102 goto cifs_setattr_exit;
3103 else
3104 rc = 0;
3105 }
3106
3107 if (attrs->ia_valid & ATTR_SIZE) {
3108 rc = cifs_set_file_size(inode, attrs, xid, full_path);
3109 if (rc != 0)
3110 goto cifs_setattr_exit;
3111 }
3112
3113 if (attrs->ia_valid & ATTR_UID)
3114 uid = attrs->ia_uid;
3115
3116 if (attrs->ia_valid & ATTR_GID)
3117 gid = attrs->ia_gid;
3118
3119 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) ||
3120 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)) {
3121 if (uid_valid(uid) || gid_valid(gid)) {
3122 mode = NO_CHANGE_64;
3123 rc = id_mode_to_cifs_acl(inode, full_path, &mode,
3124 uid, gid);
3125 if (rc) {
3126 cifs_dbg(FYI, "%s: Setting id failed with error: %d\n",
3127 __func__, rc);
3128 goto cifs_setattr_exit;
3129 }
3130 }
3131 } else
3132 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
3133 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
3134
3135 /* skip mode change if it's just for clearing setuid/setgid */
3136 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
3137 attrs->ia_valid &= ~ATTR_MODE;
3138
3139 if (attrs->ia_valid & ATTR_MODE) {
3140 mode = attrs->ia_mode;
3141 rc = 0;
3142 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) ||
3143 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)) {
3144 rc = id_mode_to_cifs_acl(inode, full_path, &mode,
3145 INVALID_UID, INVALID_GID);
3146 if (rc) {
3147 cifs_dbg(FYI, "%s: Setting ACL failed with error: %d\n",
3148 __func__, rc);
3149 goto cifs_setattr_exit;
3150 }
3151
3152 /*
3153 * In case of CIFS_MOUNT_CIFS_ACL, we cannot support all modes.
3154 * Pick up the actual mode bits that were set.
3155 */
3156 if (mode != attrs->ia_mode)
3157 attrs->ia_mode = mode;
3158 } else
3159 if (((mode & S_IWUGO) == 0) &&
3160 (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
3161
3162 dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
3163
3164 /* fix up mode if we're not using dynperm */
3165 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
3166 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
3167 } else if ((mode & S_IWUGO) &&
3168 (cifsInode->cifsAttrs & ATTR_READONLY)) {
3169
3170 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
3171 /* Attributes of 0 are ignored */
3172 if (dosattr == 0)
3173 dosattr |= ATTR_NORMAL;
3174
3175 /* reset local inode permissions to normal */
3176 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
3177 attrs->ia_mode &= ~(S_IALLUGO);
3178 if (S_ISDIR(inode->i_mode))
3179 attrs->ia_mode |=
3180 cifs_sb->ctx->dir_mode;
3181 else
3182 attrs->ia_mode |=
3183 cifs_sb->ctx->file_mode;
3184 }
3185 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
3186 /* ignore mode change - ATTR_READONLY hasn't changed */
3187 attrs->ia_valid &= ~ATTR_MODE;
3188 }
3189 }
3190
3191 if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
3192 ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
3193 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
3194 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
3195
3196 /* Even if error on time set, no sense failing the call if
3197 the server would set the time to a reasonable value anyway,
3198 and this check ensures that we are not being called from
3199 sys_utimes in which case we ought to fail the call back to
3200 the user when the server rejects the call */
3201 if ((rc) && (attrs->ia_valid &
3202 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
3203 rc = 0;
3204 }
3205
3206 /* do not need local check to inode_check_ok since the server does
3207 that */
3208 if (rc)
3209 goto cifs_setattr_exit;
3210
3211 if ((attrs->ia_valid & ATTR_SIZE) &&
3212 attrs->ia_size != i_size_read(inode)) {
3213 truncate_setsize(inode, attrs->ia_size);
3214 netfs_resize_file(&cifsInode->netfs, attrs->ia_size, true);
3215 fscache_resize_cookie(cifs_inode_cookie(inode), attrs->ia_size);
3216 }
3217
3218 setattr_copy(&nop_mnt_idmap, inode, attrs);
3219 mark_inode_dirty(inode);
3220
3221cifs_setattr_exit:
3222 free_xid(xid);
3223 free_dentry_path(page);
3224 return rc;
3225}
3226
3227int
3228cifs_setattr(struct mnt_idmap *idmap, struct dentry *direntry,
3229 struct iattr *attrs)
3230{
3231 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
3232 int rc, retries = 0;
3233#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3234 struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
3235#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3236
3237 if (unlikely(cifs_forced_shutdown(cifs_sb)))
3238 return -EIO;
3239
3240 do {
3241#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3242 if (pTcon->unix_ext)
3243 rc = cifs_setattr_unix(direntry, attrs);
3244 else
3245#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3246 rc = cifs_setattr_nounix(direntry, attrs);
3247 retries++;
3248 } while (is_retryable_error(rc) && retries < 2);
3249
3250 /* BB: add cifs_setattr_legacy for really old servers */
3251 return rc;
3252}