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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#ifdef CONFIG_CIFS_DFS_UPCALL
62 if (IS_AUTOMOUNT(inode)) {
63 inode->i_op = &cifs_dfs_referral_inode_operations;
64 } else {
65#else /* NO DFS support, treat as a directory */
66 {
67#endif
68 inode->i_op = &cifs_dir_inode_ops;
69 inode->i_fop = &cifs_dir_ops;
70 }
71 break;
72 case S_IFLNK:
73 inode->i_op = &cifs_symlink_inode_ops;
74 break;
75 default:
76 init_special_inode(inode, inode->i_mode, inode->i_rdev);
77 break;
78 }
79}
80
81/* check inode attributes against fattr. If they don't match, tag the
82 * inode for cache invalidation
83 */
84static void
85cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
86{
87 struct cifs_fscache_inode_coherency_data cd;
88 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
89
90 cifs_dbg(FYI, "%s: revalidating inode %llu\n",
91 __func__, cifs_i->uniqueid);
92
93 if (inode->i_state & I_NEW) {
94 cifs_dbg(FYI, "%s: inode %llu is new\n",
95 __func__, cifs_i->uniqueid);
96 return;
97 }
98
99 /* don't bother with revalidation if we have an oplock */
100 if (CIFS_CACHE_READ(cifs_i)) {
101 cifs_dbg(FYI, "%s: inode %llu is oplocked\n",
102 __func__, cifs_i->uniqueid);
103 return;
104 }
105
106 /* revalidate if mtime or size have changed */
107 fattr->cf_mtime = timestamp_truncate(fattr->cf_mtime, inode);
108 if (timespec64_equal(&inode->i_mtime, &fattr->cf_mtime) &&
109 cifs_i->server_eof == fattr->cf_eof) {
110 cifs_dbg(FYI, "%s: inode %llu is unchanged\n",
111 __func__, cifs_i->uniqueid);
112 return;
113 }
114
115 cifs_dbg(FYI, "%s: invalidating inode %llu mapping\n",
116 __func__, cifs_i->uniqueid);
117 set_bit(CIFS_INO_INVALID_MAPPING, &cifs_i->flags);
118 /* Invalidate fscache cookie */
119 cifs_fscache_fill_coherency(&cifs_i->netfs.inode, &cd);
120 fscache_invalidate(cifs_inode_cookie(inode), &cd, i_size_read(inode), 0);
121}
122
123/*
124 * copy nlink to the inode, unless it wasn't provided. Provide
125 * sane values if we don't have an existing one and none was provided
126 */
127static void
128cifs_nlink_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
129{
130 /*
131 * if we're in a situation where we can't trust what we
132 * got from the server (readdir, some non-unix cases)
133 * fake reasonable values
134 */
135 if (fattr->cf_flags & CIFS_FATTR_UNKNOWN_NLINK) {
136 /* only provide fake values on a new inode */
137 if (inode->i_state & I_NEW) {
138 if (fattr->cf_cifsattrs & ATTR_DIRECTORY)
139 set_nlink(inode, 2);
140 else
141 set_nlink(inode, 1);
142 }
143 return;
144 }
145
146 /* we trust the server, so update it */
147 set_nlink(inode, fattr->cf_nlink);
148}
149
150/* populate an inode with info from a cifs_fattr struct */
151int
152cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
153{
154 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
155 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
156
157 if (!(inode->i_state & I_NEW) &&
158 unlikely(inode_wrong_type(inode, fattr->cf_mode))) {
159 CIFS_I(inode)->time = 0; /* force reval */
160 return -ESTALE;
161 }
162
163 cifs_revalidate_cache(inode, fattr);
164
165 spin_lock(&inode->i_lock);
166 fattr->cf_mtime = timestamp_truncate(fattr->cf_mtime, inode);
167 fattr->cf_atime = timestamp_truncate(fattr->cf_atime, inode);
168 fattr->cf_ctime = timestamp_truncate(fattr->cf_ctime, inode);
169 /* we do not want atime to be less than mtime, it broke some apps */
170 if (timespec64_compare(&fattr->cf_atime, &fattr->cf_mtime) < 0)
171 inode->i_atime = fattr->cf_mtime;
172 else
173 inode->i_atime = fattr->cf_atime;
174 inode->i_mtime = fattr->cf_mtime;
175 inode->i_ctime = fattr->cf_ctime;
176 inode->i_rdev = fattr->cf_rdev;
177 cifs_nlink_fattr_to_inode(inode, fattr);
178 inode->i_uid = fattr->cf_uid;
179 inode->i_gid = fattr->cf_gid;
180
181 /* if dynperm is set, don't clobber existing mode */
182 if (inode->i_state & I_NEW ||
183 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM))
184 inode->i_mode = fattr->cf_mode;
185
186 cifs_i->cifsAttrs = fattr->cf_cifsattrs;
187
188 if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
189 cifs_i->time = 0;
190 else
191 cifs_i->time = jiffies;
192
193 if (fattr->cf_flags & CIFS_FATTR_DELETE_PENDING)
194 set_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags);
195 else
196 clear_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags);
197
198 cifs_i->server_eof = fattr->cf_eof;
199 /*
200 * Can't safely change the file size here if the client is writing to
201 * it due to potential races.
202 */
203 if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) {
204 i_size_write(inode, fattr->cf_eof);
205
206 /*
207 * i_blocks is not related to (i_size / i_blksize),
208 * but instead 512 byte (2**9) size is required for
209 * calculating num blocks.
210 */
211 inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
212 }
213
214 if (S_ISLNK(fattr->cf_mode)) {
215 kfree(cifs_i->symlink_target);
216 cifs_i->symlink_target = fattr->cf_symlink_target;
217 fattr->cf_symlink_target = NULL;
218 }
219 spin_unlock(&inode->i_lock);
220
221 if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL)
222 inode->i_flags |= S_AUTOMOUNT;
223 if (inode->i_state & I_NEW)
224 cifs_set_ops(inode);
225 return 0;
226}
227
228void
229cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
230{
231 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
232
233 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
234 return;
235
236 fattr->cf_uniqueid = iunique(sb, ROOT_I);
237}
238
239/* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
240void
241cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
242 struct cifs_sb_info *cifs_sb)
243{
244 memset(fattr, 0, sizeof(*fattr));
245 fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
246 fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
247 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
248
249 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
250 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime);
251 fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange);
252 /* old POSIX extensions don't get create time */
253
254 fattr->cf_mode = le64_to_cpu(info->Permissions);
255
256 /*
257 * Since we set the inode type below we need to mask off
258 * to avoid strange results if bits set above.
259 */
260 fattr->cf_mode &= ~S_IFMT;
261 switch (le32_to_cpu(info->Type)) {
262 case UNIX_FILE:
263 fattr->cf_mode |= S_IFREG;
264 fattr->cf_dtype = DT_REG;
265 break;
266 case UNIX_SYMLINK:
267 fattr->cf_mode |= S_IFLNK;
268 fattr->cf_dtype = DT_LNK;
269 break;
270 case UNIX_DIR:
271 fattr->cf_mode |= S_IFDIR;
272 fattr->cf_dtype = DT_DIR;
273 break;
274 case UNIX_CHARDEV:
275 fattr->cf_mode |= S_IFCHR;
276 fattr->cf_dtype = DT_CHR;
277 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
278 le64_to_cpu(info->DevMinor) & MINORMASK);
279 break;
280 case UNIX_BLOCKDEV:
281 fattr->cf_mode |= S_IFBLK;
282 fattr->cf_dtype = DT_BLK;
283 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
284 le64_to_cpu(info->DevMinor) & MINORMASK);
285 break;
286 case UNIX_FIFO:
287 fattr->cf_mode |= S_IFIFO;
288 fattr->cf_dtype = DT_FIFO;
289 break;
290 case UNIX_SOCKET:
291 fattr->cf_mode |= S_IFSOCK;
292 fattr->cf_dtype = DT_SOCK;
293 break;
294 default:
295 /* safest to call it a file if we do not know */
296 fattr->cf_mode |= S_IFREG;
297 fattr->cf_dtype = DT_REG;
298 cifs_dbg(FYI, "unknown type %d\n", le32_to_cpu(info->Type));
299 break;
300 }
301
302 fattr->cf_uid = cifs_sb->ctx->linux_uid;
303 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)) {
304 u64 id = le64_to_cpu(info->Uid);
305 if (id < ((uid_t)-1)) {
306 kuid_t uid = make_kuid(&init_user_ns, id);
307 if (uid_valid(uid))
308 fattr->cf_uid = uid;
309 }
310 }
311
312 fattr->cf_gid = cifs_sb->ctx->linux_gid;
313 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)) {
314 u64 id = le64_to_cpu(info->Gid);
315 if (id < ((gid_t)-1)) {
316 kgid_t gid = make_kgid(&init_user_ns, id);
317 if (gid_valid(gid))
318 fattr->cf_gid = gid;
319 }
320 }
321
322 fattr->cf_nlink = le64_to_cpu(info->Nlinks);
323}
324
325/*
326 * Fill a cifs_fattr struct with fake inode info.
327 *
328 * Needed to setup cifs_fattr data for the directory which is the
329 * junction to the new submount (ie to setup the fake directory
330 * which represents a DFS referral).
331 */
332static void
333cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
334{
335 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
336
337 cifs_dbg(FYI, "creating fake fattr for DFS referral\n");
338
339 memset(fattr, 0, sizeof(*fattr));
340 fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
341 fattr->cf_uid = cifs_sb->ctx->linux_uid;
342 fattr->cf_gid = cifs_sb->ctx->linux_gid;
343 ktime_get_coarse_real_ts64(&fattr->cf_mtime);
344 fattr->cf_atime = fattr->cf_ctime = fattr->cf_mtime;
345 fattr->cf_nlink = 2;
346 fattr->cf_flags = CIFS_FATTR_DFS_REFERRAL;
347}
348
349#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
350static int
351cifs_get_file_info_unix(struct file *filp)
352{
353 int rc;
354 unsigned int xid;
355 FILE_UNIX_BASIC_INFO find_data;
356 struct cifs_fattr fattr = {};
357 struct inode *inode = file_inode(filp);
358 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
359 struct cifsFileInfo *cfile = filp->private_data;
360 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
361
362 xid = get_xid();
363
364 if (cfile->symlink_target) {
365 fattr.cf_symlink_target = kstrdup(cfile->symlink_target, GFP_KERNEL);
366 if (!fattr.cf_symlink_target) {
367 rc = -ENOMEM;
368 goto cifs_gfiunix_out;
369 }
370 }
371
372 rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->fid.netfid, &find_data);
373 if (!rc) {
374 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
375 } else if (rc == -EREMOTE) {
376 cifs_create_dfs_fattr(&fattr, inode->i_sb);
377 rc = 0;
378 } else
379 goto cifs_gfiunix_out;
380
381 rc = cifs_fattr_to_inode(inode, &fattr);
382
383cifs_gfiunix_out:
384 free_xid(xid);
385 return rc;
386}
387
388int cifs_get_inode_info_unix(struct inode **pinode,
389 const unsigned char *full_path,
390 struct super_block *sb, unsigned int xid)
391{
392 int rc;
393 FILE_UNIX_BASIC_INFO find_data;
394 struct cifs_fattr fattr;
395 struct cifs_tcon *tcon;
396 struct TCP_Server_Info *server;
397 struct tcon_link *tlink;
398 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
399
400 cifs_dbg(FYI, "Getting info on %s\n", full_path);
401
402 tlink = cifs_sb_tlink(cifs_sb);
403 if (IS_ERR(tlink))
404 return PTR_ERR(tlink);
405 tcon = tlink_tcon(tlink);
406 server = tcon->ses->server;
407
408 /* could have done a find first instead but this returns more info */
409 rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
410 cifs_sb->local_nls, cifs_remap(cifs_sb));
411 cifs_dbg(FYI, "%s: query path info: rc = %d\n", __func__, rc);
412 cifs_put_tlink(tlink);
413
414 if (!rc) {
415 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
416 } else if (rc == -EREMOTE) {
417 cifs_create_dfs_fattr(&fattr, sb);
418 rc = 0;
419 } else {
420 return rc;
421 }
422
423 /* check for Minshall+French symlinks */
424 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
425 int tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
426 full_path);
427 if (tmprc)
428 cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
429 }
430
431 if (S_ISLNK(fattr.cf_mode) && !fattr.cf_symlink_target) {
432 if (!server->ops->query_symlink)
433 return -EOPNOTSUPP;
434 rc = server->ops->query_symlink(xid, tcon, cifs_sb, full_path,
435 &fattr.cf_symlink_target, false);
436 if (rc) {
437 cifs_dbg(FYI, "%s: query_symlink: %d\n", __func__, rc);
438 goto cgiiu_exit;
439 }
440 }
441
442 if (*pinode == NULL) {
443 /* get new inode */
444 cifs_fill_uniqueid(sb, &fattr);
445 *pinode = cifs_iget(sb, &fattr);
446 if (!*pinode)
447 rc = -ENOMEM;
448 } else {
449 /* we already have inode, update it */
450
451 /* if uniqueid is different, return error */
452 if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
453 CIFS_I(*pinode)->uniqueid != fattr.cf_uniqueid)) {
454 CIFS_I(*pinode)->time = 0; /* force reval */
455 rc = -ESTALE;
456 goto cgiiu_exit;
457 }
458
459 /* if filetype is different, return error */
460 rc = cifs_fattr_to_inode(*pinode, &fattr);
461 }
462
463cgiiu_exit:
464 kfree(fattr.cf_symlink_target);
465 return rc;
466}
467#else
468int cifs_get_inode_info_unix(struct inode **pinode,
469 const unsigned char *full_path,
470 struct super_block *sb, unsigned int xid)
471{
472 return -EOPNOTSUPP;
473}
474#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
475
476static int
477cifs_sfu_type(struct cifs_fattr *fattr, const char *path,
478 struct cifs_sb_info *cifs_sb, unsigned int xid)
479{
480 int rc;
481 __u32 oplock;
482 struct tcon_link *tlink;
483 struct cifs_tcon *tcon;
484 struct cifs_fid fid;
485 struct cifs_open_parms oparms;
486 struct cifs_io_parms io_parms = {0};
487 char buf[24];
488 unsigned int bytes_read;
489 char *pbuf;
490 int buf_type = CIFS_NO_BUFFER;
491
492 pbuf = buf;
493
494 fattr->cf_mode &= ~S_IFMT;
495
496 if (fattr->cf_eof == 0) {
497 fattr->cf_mode |= S_IFIFO;
498 fattr->cf_dtype = DT_FIFO;
499 return 0;
500 } else if (fattr->cf_eof < 8) {
501 fattr->cf_mode |= S_IFREG;
502 fattr->cf_dtype = DT_REG;
503 return -EINVAL; /* EOPNOTSUPP? */
504 }
505
506 tlink = cifs_sb_tlink(cifs_sb);
507 if (IS_ERR(tlink))
508 return PTR_ERR(tlink);
509 tcon = tlink_tcon(tlink);
510
511 oparms.tcon = tcon;
512 oparms.cifs_sb = cifs_sb;
513 oparms.desired_access = GENERIC_READ;
514 oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
515 oparms.disposition = FILE_OPEN;
516 oparms.path = path;
517 oparms.fid = &fid;
518 oparms.reconnect = false;
519
520 if (tcon->ses->server->oplocks)
521 oplock = REQ_OPLOCK;
522 else
523 oplock = 0;
524 rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, NULL);
525 if (rc) {
526 cifs_dbg(FYI, "check sfu type of %s, open rc = %d\n", path, rc);
527 cifs_put_tlink(tlink);
528 return rc;
529 }
530
531 /* Read header */
532 io_parms.netfid = fid.netfid;
533 io_parms.pid = current->tgid;
534 io_parms.tcon = tcon;
535 io_parms.offset = 0;
536 io_parms.length = 24;
537
538 rc = tcon->ses->server->ops->sync_read(xid, &fid, &io_parms,
539 &bytes_read, &pbuf, &buf_type);
540 if ((rc == 0) && (bytes_read >= 8)) {
541 if (memcmp("IntxBLK", pbuf, 8) == 0) {
542 cifs_dbg(FYI, "Block device\n");
543 fattr->cf_mode |= S_IFBLK;
544 fattr->cf_dtype = DT_BLK;
545 if (bytes_read == 24) {
546 /* we have enough to decode dev num */
547 __u64 mjr; /* major */
548 __u64 mnr; /* minor */
549 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
550 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
551 fattr->cf_rdev = MKDEV(mjr, mnr);
552 }
553 } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
554 cifs_dbg(FYI, "Char device\n");
555 fattr->cf_mode |= S_IFCHR;
556 fattr->cf_dtype = DT_CHR;
557 if (bytes_read == 24) {
558 /* we have enough to decode dev num */
559 __u64 mjr; /* major */
560 __u64 mnr; /* minor */
561 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
562 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
563 fattr->cf_rdev = MKDEV(mjr, mnr);
564 }
565 } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
566 cifs_dbg(FYI, "Symlink\n");
567 fattr->cf_mode |= S_IFLNK;
568 fattr->cf_dtype = DT_LNK;
569 } else {
570 fattr->cf_mode |= S_IFREG; /* file? */
571 fattr->cf_dtype = DT_REG;
572 rc = -EOPNOTSUPP;
573 }
574 } else {
575 fattr->cf_mode |= S_IFREG; /* then it is a file */
576 fattr->cf_dtype = DT_REG;
577 rc = -EOPNOTSUPP; /* or some unknown SFU type */
578 }
579
580 tcon->ses->server->ops->close(xid, tcon, &fid);
581 cifs_put_tlink(tlink);
582 return rc;
583}
584
585#define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */
586
587/*
588 * Fetch mode bits as provided by SFU.
589 *
590 * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ?
591 */
592static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
593 struct cifs_sb_info *cifs_sb, unsigned int xid)
594{
595#ifdef CONFIG_CIFS_XATTR
596 ssize_t rc;
597 char ea_value[4];
598 __u32 mode;
599 struct tcon_link *tlink;
600 struct cifs_tcon *tcon;
601
602 tlink = cifs_sb_tlink(cifs_sb);
603 if (IS_ERR(tlink))
604 return PTR_ERR(tlink);
605 tcon = tlink_tcon(tlink);
606
607 if (tcon->ses->server->ops->query_all_EAs == NULL) {
608 cifs_put_tlink(tlink);
609 return -EOPNOTSUPP;
610 }
611
612 rc = tcon->ses->server->ops->query_all_EAs(xid, tcon, path,
613 "SETFILEBITS", ea_value, 4 /* size of buf */,
614 cifs_sb);
615 cifs_put_tlink(tlink);
616 if (rc < 0)
617 return (int)rc;
618 else if (rc > 3) {
619 mode = le32_to_cpu(*((__le32 *)ea_value));
620 fattr->cf_mode &= ~SFBITS_MASK;
621 cifs_dbg(FYI, "special bits 0%o org mode 0%o\n",
622 mode, fattr->cf_mode);
623 fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode;
624 cifs_dbg(FYI, "special mode bits 0%o\n", mode);
625 }
626
627 return 0;
628#else
629 return -EOPNOTSUPP;
630#endif
631}
632
633/* Fill a cifs_fattr struct with info from POSIX info struct */
634static void smb311_posix_info_to_fattr(struct cifs_fattr *fattr, struct cifs_open_info_data *data,
635 struct cifs_sid *owner,
636 struct cifs_sid *group,
637 struct super_block *sb, bool adjust_tz, bool symlink)
638{
639 struct smb311_posix_qinfo *info = &data->posix_fi;
640 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
641 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
642
643 memset(fattr, 0, sizeof(*fattr));
644
645 /* no fattr->flags to set */
646 fattr->cf_cifsattrs = le32_to_cpu(info->DosAttributes);
647 fattr->cf_uniqueid = le64_to_cpu(info->Inode);
648
649 if (info->LastAccessTime)
650 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
651 else
652 ktime_get_coarse_real_ts64(&fattr->cf_atime);
653
654 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
655 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
656
657 if (adjust_tz) {
658 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
659 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
660 }
661
662 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
663 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
664 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
665
666 fattr->cf_nlink = le32_to_cpu(info->HardLinks);
667 fattr->cf_mode = (umode_t) le32_to_cpu(info->Mode);
668 /* The srv fs device id is overridden on network mount so setting rdev isn't needed here */
669 /* fattr->cf_rdev = le32_to_cpu(info->DeviceId); */
670
671 if (symlink) {
672 fattr->cf_mode |= S_IFLNK;
673 fattr->cf_dtype = DT_LNK;
674 fattr->cf_symlink_target = data->symlink_target;
675 data->symlink_target = NULL;
676 } else if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
677 fattr->cf_mode |= S_IFDIR;
678 fattr->cf_dtype = DT_DIR;
679 } else { /* file */
680 fattr->cf_mode |= S_IFREG;
681 fattr->cf_dtype = DT_REG;
682 }
683 /* else if reparse point ... TODO: add support for FIFO and blk dev; special file types */
684
685 sid_to_id(cifs_sb, owner, fattr, SIDOWNER);
686 sid_to_id(cifs_sb, group, fattr, SIDGROUP);
687
688 cifs_dbg(FYI, "POSIX query info: mode 0x%x uniqueid 0x%llx nlink %d\n",
689 fattr->cf_mode, fattr->cf_uniqueid, fattr->cf_nlink);
690}
691
692static void cifs_open_info_to_fattr(struct cifs_fattr *fattr, struct cifs_open_info_data *data,
693 struct super_block *sb, bool adjust_tz, bool symlink,
694 u32 reparse_tag)
695{
696 struct smb2_file_all_info *info = &data->fi;
697 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
698 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
699
700 memset(fattr, 0, sizeof(*fattr));
701 fattr->cf_cifsattrs = le32_to_cpu(info->Attributes);
702 if (info->DeletePending)
703 fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING;
704
705 if (info->LastAccessTime)
706 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
707 else
708 ktime_get_coarse_real_ts64(&fattr->cf_atime);
709
710 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
711 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
712
713 if (adjust_tz) {
714 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
715 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
716 }
717
718 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
719 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
720 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
721
722 fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
723 if (reparse_tag == IO_REPARSE_TAG_LX_SYMLINK) {
724 fattr->cf_mode |= S_IFLNK | cifs_sb->ctx->file_mode;
725 fattr->cf_dtype = DT_LNK;
726 } else if (reparse_tag == IO_REPARSE_TAG_LX_FIFO) {
727 fattr->cf_mode |= S_IFIFO | cifs_sb->ctx->file_mode;
728 fattr->cf_dtype = DT_FIFO;
729 } else if (reparse_tag == IO_REPARSE_TAG_AF_UNIX) {
730 fattr->cf_mode |= S_IFSOCK | cifs_sb->ctx->file_mode;
731 fattr->cf_dtype = DT_SOCK;
732 } else if (reparse_tag == IO_REPARSE_TAG_LX_CHR) {
733 fattr->cf_mode |= S_IFCHR | cifs_sb->ctx->file_mode;
734 fattr->cf_dtype = DT_CHR;
735 } else if (reparse_tag == IO_REPARSE_TAG_LX_BLK) {
736 fattr->cf_mode |= S_IFBLK | cifs_sb->ctx->file_mode;
737 fattr->cf_dtype = DT_BLK;
738 } else if (symlink || reparse_tag == IO_REPARSE_TAG_SYMLINK ||
739 reparse_tag == IO_REPARSE_TAG_NFS) {
740 fattr->cf_mode = S_IFLNK;
741 fattr->cf_dtype = DT_LNK;
742 } else if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
743 fattr->cf_mode = S_IFDIR | cifs_sb->ctx->dir_mode;
744 fattr->cf_dtype = DT_DIR;
745 /*
746 * Server can return wrong NumberOfLinks value for directories
747 * when Unix extensions are disabled - fake it.
748 */
749 if (!tcon->unix_ext)
750 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
751 } else {
752 fattr->cf_mode = S_IFREG | cifs_sb->ctx->file_mode;
753 fattr->cf_dtype = DT_REG;
754
755 /* clear write bits if ATTR_READONLY is set */
756 if (fattr->cf_cifsattrs & ATTR_READONLY)
757 fattr->cf_mode &= ~(S_IWUGO);
758
759 /*
760 * Don't accept zero nlink from non-unix servers unless
761 * delete is pending. Instead mark it as unknown.
762 */
763 if ((fattr->cf_nlink < 1) && !tcon->unix_ext &&
764 !info->DeletePending) {
765 cifs_dbg(VFS, "bogus file nlink value %u\n",
766 fattr->cf_nlink);
767 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
768 }
769 }
770
771 if (S_ISLNK(fattr->cf_mode)) {
772 fattr->cf_symlink_target = data->symlink_target;
773 data->symlink_target = NULL;
774 }
775
776 fattr->cf_uid = cifs_sb->ctx->linux_uid;
777 fattr->cf_gid = cifs_sb->ctx->linux_gid;
778}
779
780static int
781cifs_get_file_info(struct file *filp)
782{
783 int rc;
784 unsigned int xid;
785 struct cifs_open_info_data data = {};
786 struct cifs_fattr fattr;
787 struct inode *inode = file_inode(filp);
788 struct cifsFileInfo *cfile = filp->private_data;
789 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
790 struct TCP_Server_Info *server = tcon->ses->server;
791 bool symlink = false;
792 u32 tag = 0;
793
794 if (!server->ops->query_file_info)
795 return -ENOSYS;
796
797 xid = get_xid();
798 rc = server->ops->query_file_info(xid, tcon, cfile, &data);
799 switch (rc) {
800 case 0:
801 /* TODO: add support to query reparse tag */
802 if (data.symlink_target) {
803 symlink = true;
804 tag = IO_REPARSE_TAG_SYMLINK;
805 }
806 cifs_open_info_to_fattr(&fattr, &data, inode->i_sb, false, symlink, tag);
807 break;
808 case -EREMOTE:
809 cifs_create_dfs_fattr(&fattr, inode->i_sb);
810 rc = 0;
811 break;
812 case -EOPNOTSUPP:
813 case -EINVAL:
814 /*
815 * FIXME: legacy server -- fall back to path-based call?
816 * for now, just skip revalidating and mark inode for
817 * immediate reval.
818 */
819 rc = 0;
820 CIFS_I(inode)->time = 0;
821 goto cgfi_exit;
822 default:
823 goto cgfi_exit;
824 }
825
826 /*
827 * don't bother with SFU junk here -- just mark inode as needing
828 * revalidation.
829 */
830 fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
831 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
832 /* if filetype is different, return error */
833 rc = cifs_fattr_to_inode(inode, &fattr);
834cgfi_exit:
835 cifs_free_open_info(&data);
836 free_xid(xid);
837 return rc;
838}
839
840/* Simple function to return a 64 bit hash of string. Rarely called */
841static __u64 simple_hashstr(const char *str)
842{
843 const __u64 hash_mult = 1125899906842597ULL; /* a big enough prime */
844 __u64 hash = 0;
845
846 while (*str)
847 hash = (hash + (__u64) *str++) * hash_mult;
848
849 return hash;
850}
851
852#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
853/**
854 * cifs_backup_query_path_info - SMB1 fallback code to get ino
855 *
856 * Fallback code to get file metadata when we don't have access to
857 * full_path (EACCES) and have backup creds.
858 *
859 * @xid: transaction id used to identify original request in logs
860 * @tcon: information about the server share we have mounted
861 * @sb: the superblock stores info such as disk space available
862 * @full_path: name of the file we are getting the metadata for
863 * @resp_buf: will be set to cifs resp buf and needs to be freed with
864 * cifs_buf_release() when done with @data
865 * @data: will be set to search info result buffer
866 */
867static int
868cifs_backup_query_path_info(int xid,
869 struct cifs_tcon *tcon,
870 struct super_block *sb,
871 const char *full_path,
872 void **resp_buf,
873 FILE_ALL_INFO **data)
874{
875 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
876 struct cifs_search_info info = {0};
877 u16 flags;
878 int rc;
879
880 *resp_buf = NULL;
881 info.endOfSearch = false;
882 if (tcon->unix_ext)
883 info.info_level = SMB_FIND_FILE_UNIX;
884 else if ((tcon->ses->capabilities &
885 tcon->ses->server->vals->cap_nt_find) == 0)
886 info.info_level = SMB_FIND_FILE_INFO_STANDARD;
887 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
888 info.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
889 else /* no srvino useful for fallback to some netapp */
890 info.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
891
892 flags = CIFS_SEARCH_CLOSE_ALWAYS |
893 CIFS_SEARCH_CLOSE_AT_END |
894 CIFS_SEARCH_BACKUP_SEARCH;
895
896 rc = CIFSFindFirst(xid, tcon, full_path,
897 cifs_sb, NULL, flags, &info, false);
898 if (rc)
899 return rc;
900
901 *resp_buf = (void *)info.ntwrk_buf_start;
902 *data = (FILE_ALL_INFO *)info.srch_entries_start;
903 return 0;
904}
905#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
906
907static void cifs_set_fattr_ino(int xid, struct cifs_tcon *tcon, struct super_block *sb,
908 struct inode **inode, const char *full_path,
909 struct cifs_open_info_data *data, struct cifs_fattr *fattr)
910{
911 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
912 struct TCP_Server_Info *server = tcon->ses->server;
913 int rc;
914
915 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
916 if (*inode)
917 fattr->cf_uniqueid = CIFS_I(*inode)->uniqueid;
918 else
919 fattr->cf_uniqueid = iunique(sb, ROOT_I);
920 return;
921 }
922
923 /*
924 * If we have an inode pass a NULL tcon to ensure we don't
925 * make a round trip to the server. This only works for SMB2+.
926 */
927 rc = server->ops->get_srv_inum(xid, *inode ? NULL : tcon, cifs_sb, full_path,
928 &fattr->cf_uniqueid, data);
929 if (rc) {
930 /*
931 * If that fails reuse existing ino or generate one
932 * and disable server ones
933 */
934 if (*inode)
935 fattr->cf_uniqueid = CIFS_I(*inode)->uniqueid;
936 else {
937 fattr->cf_uniqueid = iunique(sb, ROOT_I);
938 cifs_autodisable_serverino(cifs_sb);
939 }
940 return;
941 }
942
943 /* If no errors, check for zero root inode (invalid) */
944 if (fattr->cf_uniqueid == 0 && strlen(full_path) == 0) {
945 cifs_dbg(FYI, "Invalid (0) inodenum\n");
946 if (*inode) {
947 /* reuse */
948 fattr->cf_uniqueid = CIFS_I(*inode)->uniqueid;
949 } else {
950 /* make an ino by hashing the UNC */
951 fattr->cf_flags |= CIFS_FATTR_FAKE_ROOT_INO;
952 fattr->cf_uniqueid = simple_hashstr(tcon->tree_name);
953 }
954 }
955}
956
957static inline bool is_inode_cache_good(struct inode *ino)
958{
959 return ino && CIFS_CACHE_READ(CIFS_I(ino)) && CIFS_I(ino)->time != 0;
960}
961
962int cifs_get_inode_info(struct inode **inode, const char *full_path,
963 struct cifs_open_info_data *data, struct super_block *sb, int xid,
964 const struct cifs_fid *fid)
965{
966 struct cifs_tcon *tcon;
967 struct TCP_Server_Info *server;
968 struct tcon_link *tlink;
969 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
970 bool adjust_tz = false;
971 struct cifs_fattr fattr = {0};
972 bool is_reparse_point = false;
973 struct cifs_open_info_data tmp_data = {};
974 void *smb1_backup_rsp_buf = NULL;
975 int rc = 0;
976 int tmprc = 0;
977 __u32 reparse_tag = 0;
978
979 tlink = cifs_sb_tlink(cifs_sb);
980 if (IS_ERR(tlink))
981 return PTR_ERR(tlink);
982 tcon = tlink_tcon(tlink);
983 server = tcon->ses->server;
984
985 /*
986 * 1. Fetch file metadata if not provided (data)
987 */
988
989 if (!data) {
990 if (is_inode_cache_good(*inode)) {
991 cifs_dbg(FYI, "No need to revalidate cached inode sizes\n");
992 goto out;
993 }
994 rc = server->ops->query_path_info(xid, tcon, cifs_sb, full_path, &tmp_data,
995 &adjust_tz, &is_reparse_point);
996 data = &tmp_data;
997 }
998
999 /*
1000 * 2. Convert it to internal cifs metadata (fattr)
1001 */
1002
1003 switch (rc) {
1004 case 0:
1005 /*
1006 * If the file is a reparse point, it is more complicated
1007 * since we have to check if its reparse tag matches a known
1008 * special file type e.g. symlink or fifo or char etc.
1009 */
1010 if (is_reparse_point && data->symlink_target) {
1011 reparse_tag = IO_REPARSE_TAG_SYMLINK;
1012 } else if ((le32_to_cpu(data->fi.Attributes) & ATTR_REPARSE) &&
1013 server->ops->query_reparse_tag) {
1014 tmprc = server->ops->query_reparse_tag(xid, tcon, cifs_sb, full_path,
1015 &reparse_tag);
1016 if (tmprc)
1017 cifs_dbg(FYI, "%s: query_reparse_tag: rc = %d\n", __func__, tmprc);
1018 if (server->ops->query_symlink) {
1019 tmprc = server->ops->query_symlink(xid, tcon, cifs_sb, full_path,
1020 &data->symlink_target,
1021 is_reparse_point);
1022 if (tmprc)
1023 cifs_dbg(FYI, "%s: query_symlink: rc = %d\n", __func__,
1024 tmprc);
1025 }
1026 }
1027 cifs_open_info_to_fattr(&fattr, data, sb, adjust_tz, is_reparse_point, reparse_tag);
1028 break;
1029 case -EREMOTE:
1030 /* DFS link, no metadata available on this server */
1031 cifs_create_dfs_fattr(&fattr, sb);
1032 rc = 0;
1033 break;
1034 case -EACCES:
1035#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1036 /*
1037 * perm errors, try again with backup flags if possible
1038 *
1039 * For SMB2 and later the backup intent flag
1040 * is already sent if needed on open and there
1041 * is no path based FindFirst operation to use
1042 * to retry with
1043 */
1044 if (backup_cred(cifs_sb) && is_smb1_server(server)) {
1045 /* for easier reading */
1046 FILE_ALL_INFO *fi;
1047 FILE_DIRECTORY_INFO *fdi;
1048 SEARCH_ID_FULL_DIR_INFO *si;
1049
1050 rc = cifs_backup_query_path_info(xid, tcon, sb,
1051 full_path,
1052 &smb1_backup_rsp_buf,
1053 &fi);
1054 if (rc)
1055 goto out;
1056
1057 move_cifs_info_to_smb2(&data->fi, fi);
1058 fdi = (FILE_DIRECTORY_INFO *)fi;
1059 si = (SEARCH_ID_FULL_DIR_INFO *)fi;
1060
1061 cifs_dir_info_to_fattr(&fattr, fdi, cifs_sb);
1062 fattr.cf_uniqueid = le64_to_cpu(si->UniqueId);
1063 /* uniqueid set, skip get inum step */
1064 goto handle_mnt_opt;
1065 } else {
1066 /* nothing we can do, bail out */
1067 goto out;
1068 }
1069#else
1070 goto out;
1071#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1072 break;
1073 default:
1074 cifs_dbg(FYI, "%s: unhandled err rc %d\n", __func__, rc);
1075 goto out;
1076 }
1077
1078 /*
1079 * 3. Get or update inode number (fattr.cf_uniqueid)
1080 */
1081
1082 cifs_set_fattr_ino(xid, tcon, sb, inode, full_path, data, &fattr);
1083
1084 /*
1085 * 4. Tweak fattr based on mount options
1086 */
1087#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1088handle_mnt_opt:
1089#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1090 /* query for SFU type info if supported and needed */
1091 if (fattr.cf_cifsattrs & ATTR_SYSTEM &&
1092 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
1093 tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid);
1094 if (tmprc)
1095 cifs_dbg(FYI, "cifs_sfu_type failed: %d\n", tmprc);
1096 }
1097
1098 /* fill in 0777 bits from ACL */
1099 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) {
1100 rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, true,
1101 full_path, fid);
1102 if (rc == -EREMOTE)
1103 rc = 0;
1104 if (rc) {
1105 cifs_dbg(FYI, "%s: Get mode from SID failed. rc=%d\n",
1106 __func__, rc);
1107 goto out;
1108 }
1109 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
1110 rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, false,
1111 full_path, fid);
1112 if (rc == -EREMOTE)
1113 rc = 0;
1114 if (rc) {
1115 cifs_dbg(FYI, "%s: Getting ACL failed with error: %d\n",
1116 __func__, rc);
1117 goto out;
1118 }
1119 }
1120
1121 /* fill in remaining high mode bits e.g. SUID, VTX */
1122 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
1123 cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
1124
1125 /* check for Minshall+French symlinks */
1126 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
1127 tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
1128 full_path);
1129 if (tmprc)
1130 cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
1131 }
1132
1133 /*
1134 * 5. Update inode with final fattr data
1135 */
1136
1137 if (!*inode) {
1138 *inode = cifs_iget(sb, &fattr);
1139 if (!*inode)
1140 rc = -ENOMEM;
1141 } else {
1142 /* we already have inode, update it */
1143
1144 /* if uniqueid is different, return error */
1145 if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
1146 CIFS_I(*inode)->uniqueid != fattr.cf_uniqueid)) {
1147 CIFS_I(*inode)->time = 0; /* force reval */
1148 rc = -ESTALE;
1149 goto out;
1150 }
1151 /* if filetype is different, return error */
1152 rc = cifs_fattr_to_inode(*inode, &fattr);
1153 }
1154out:
1155 cifs_buf_release(smb1_backup_rsp_buf);
1156 cifs_put_tlink(tlink);
1157 cifs_free_open_info(&tmp_data);
1158 kfree(fattr.cf_symlink_target);
1159 return rc;
1160}
1161
1162int
1163smb311_posix_get_inode_info(struct inode **inode,
1164 const char *full_path,
1165 struct super_block *sb, unsigned int xid)
1166{
1167 struct cifs_tcon *tcon;
1168 struct tcon_link *tlink;
1169 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1170 bool adjust_tz = false;
1171 struct cifs_fattr fattr = {0};
1172 bool symlink = false;
1173 struct cifs_open_info_data data = {};
1174 struct cifs_sid owner, group;
1175 int rc = 0;
1176 int tmprc = 0;
1177
1178 tlink = cifs_sb_tlink(cifs_sb);
1179 if (IS_ERR(tlink))
1180 return PTR_ERR(tlink);
1181 tcon = tlink_tcon(tlink);
1182
1183 /*
1184 * 1. Fetch file metadata
1185 */
1186
1187 if (is_inode_cache_good(*inode)) {
1188 cifs_dbg(FYI, "No need to revalidate cached inode sizes\n");
1189 goto out;
1190 }
1191
1192 rc = smb311_posix_query_path_info(xid, tcon, cifs_sb, full_path, &data,
1193 &owner, &group, &adjust_tz,
1194 &symlink);
1195
1196 /*
1197 * 2. Convert it to internal cifs metadata (fattr)
1198 */
1199
1200 switch (rc) {
1201 case 0:
1202 smb311_posix_info_to_fattr(&fattr, &data, &owner, &group,
1203 sb, adjust_tz, symlink);
1204 break;
1205 case -EREMOTE:
1206 /* DFS link, no metadata available on this server */
1207 cifs_create_dfs_fattr(&fattr, sb);
1208 rc = 0;
1209 break;
1210 case -EACCES:
1211 /*
1212 * For SMB2 and later the backup intent flag
1213 * is already sent if needed on open and there
1214 * is no path based FindFirst operation to use
1215 * to retry with so nothing we can do, bail out
1216 */
1217 goto out;
1218 default:
1219 cifs_dbg(FYI, "%s: unhandled err rc %d\n", __func__, rc);
1220 goto out;
1221 }
1222
1223
1224 /*
1225 * 3. Tweak fattr based on mount options
1226 */
1227
1228 /* check for Minshall+French symlinks */
1229 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
1230 tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
1231 full_path);
1232 if (tmprc)
1233 cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
1234 }
1235
1236 /*
1237 * 4. Update inode with final fattr data
1238 */
1239
1240 if (!*inode) {
1241 *inode = cifs_iget(sb, &fattr);
1242 if (!*inode)
1243 rc = -ENOMEM;
1244 } else {
1245 /* we already have inode, update it */
1246
1247 /* if uniqueid is different, return error */
1248 if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
1249 CIFS_I(*inode)->uniqueid != fattr.cf_uniqueid)) {
1250 CIFS_I(*inode)->time = 0; /* force reval */
1251 rc = -ESTALE;
1252 goto out;
1253 }
1254
1255 /* if filetype is different, return error */
1256 rc = cifs_fattr_to_inode(*inode, &fattr);
1257 }
1258out:
1259 cifs_put_tlink(tlink);
1260 cifs_free_open_info(&data);
1261 kfree(fattr.cf_symlink_target);
1262 return rc;
1263}
1264
1265
1266static const struct inode_operations cifs_ipc_inode_ops = {
1267 .lookup = cifs_lookup,
1268};
1269
1270static int
1271cifs_find_inode(struct inode *inode, void *opaque)
1272{
1273 struct cifs_fattr *fattr = opaque;
1274
1275 /* don't match inode with different uniqueid */
1276 if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
1277 return 0;
1278
1279 /* use createtime like an i_generation field */
1280 if (CIFS_I(inode)->createtime != fattr->cf_createtime)
1281 return 0;
1282
1283 /* don't match inode of different type */
1284 if (inode_wrong_type(inode, fattr->cf_mode))
1285 return 0;
1286
1287 /* if it's not a directory or has no dentries, then flag it */
1288 if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry))
1289 fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
1290
1291 return 1;
1292}
1293
1294static int
1295cifs_init_inode(struct inode *inode, void *opaque)
1296{
1297 struct cifs_fattr *fattr = opaque;
1298
1299 CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
1300 CIFS_I(inode)->createtime = fattr->cf_createtime;
1301 return 0;
1302}
1303
1304/*
1305 * walk dentry list for an inode and report whether it has aliases that
1306 * are hashed. We use this to determine if a directory inode can actually
1307 * be used.
1308 */
1309static bool
1310inode_has_hashed_dentries(struct inode *inode)
1311{
1312 struct dentry *dentry;
1313
1314 spin_lock(&inode->i_lock);
1315 hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) {
1316 if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
1317 spin_unlock(&inode->i_lock);
1318 return true;
1319 }
1320 }
1321 spin_unlock(&inode->i_lock);
1322 return false;
1323}
1324
1325/* Given fattrs, get a corresponding inode */
1326struct inode *
1327cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
1328{
1329 unsigned long hash;
1330 struct inode *inode;
1331
1332retry_iget5_locked:
1333 cifs_dbg(FYI, "looking for uniqueid=%llu\n", fattr->cf_uniqueid);
1334
1335 /* hash down to 32-bits on 32-bit arch */
1336 hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
1337
1338 inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
1339 if (inode) {
1340 /* was there a potentially problematic inode collision? */
1341 if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
1342 fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
1343
1344 if (inode_has_hashed_dentries(inode)) {
1345 cifs_autodisable_serverino(CIFS_SB(sb));
1346 iput(inode);
1347 fattr->cf_uniqueid = iunique(sb, ROOT_I);
1348 goto retry_iget5_locked;
1349 }
1350 }
1351
1352 /* can't fail - see cifs_find_inode() */
1353 cifs_fattr_to_inode(inode, fattr);
1354 if (sb->s_flags & SB_NOATIME)
1355 inode->i_flags |= S_NOATIME | S_NOCMTIME;
1356 if (inode->i_state & I_NEW) {
1357 inode->i_ino = hash;
1358 cifs_fscache_get_inode_cookie(inode);
1359 unlock_new_inode(inode);
1360 }
1361 }
1362
1363 return inode;
1364}
1365
1366/* gets root inode */
1367struct inode *cifs_root_iget(struct super_block *sb)
1368{
1369 unsigned int xid;
1370 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1371 struct inode *inode = NULL;
1372 long rc;
1373 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
1374 char *path = NULL;
1375 int len;
1376
1377 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
1378 && cifs_sb->prepath) {
1379 len = strlen(cifs_sb->prepath);
1380 path = kzalloc(len + 2 /* leading sep + null */, GFP_KERNEL);
1381 if (path == NULL)
1382 return ERR_PTR(-ENOMEM);
1383 path[0] = '/';
1384 memcpy(path+1, cifs_sb->prepath, len);
1385 } else {
1386 path = kstrdup("", GFP_KERNEL);
1387 if (path == NULL)
1388 return ERR_PTR(-ENOMEM);
1389 }
1390
1391 xid = get_xid();
1392 if (tcon->unix_ext) {
1393 rc = cifs_get_inode_info_unix(&inode, path, sb, xid);
1394 /* some servers mistakenly claim POSIX support */
1395 if (rc != -EOPNOTSUPP)
1396 goto iget_no_retry;
1397 cifs_dbg(VFS, "server does not support POSIX extensions\n");
1398 tcon->unix_ext = false;
1399 }
1400
1401 convert_delimiter(path, CIFS_DIR_SEP(cifs_sb));
1402 if (tcon->posix_extensions)
1403 rc = smb311_posix_get_inode_info(&inode, path, sb, xid);
1404 else
1405 rc = cifs_get_inode_info(&inode, path, NULL, sb, xid, NULL);
1406
1407iget_no_retry:
1408 if (!inode) {
1409 inode = ERR_PTR(rc);
1410 goto out;
1411 }
1412
1413 if (rc && tcon->pipe) {
1414 cifs_dbg(FYI, "ipc connection - fake read inode\n");
1415 spin_lock(&inode->i_lock);
1416 inode->i_mode |= S_IFDIR;
1417 set_nlink(inode, 2);
1418 inode->i_op = &cifs_ipc_inode_ops;
1419 inode->i_fop = &simple_dir_operations;
1420 inode->i_uid = cifs_sb->ctx->linux_uid;
1421 inode->i_gid = cifs_sb->ctx->linux_gid;
1422 spin_unlock(&inode->i_lock);
1423 } else if (rc) {
1424 iget_failed(inode);
1425 inode = ERR_PTR(rc);
1426 }
1427
1428out:
1429 kfree(path);
1430 free_xid(xid);
1431 return inode;
1432}
1433
1434int
1435cifs_set_file_info(struct inode *inode, struct iattr *attrs, unsigned int xid,
1436 const char *full_path, __u32 dosattr)
1437{
1438 bool set_time = false;
1439 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1440 struct TCP_Server_Info *server;
1441 FILE_BASIC_INFO info_buf;
1442
1443 if (attrs == NULL)
1444 return -EINVAL;
1445
1446 server = cifs_sb_master_tcon(cifs_sb)->ses->server;
1447 if (!server->ops->set_file_info)
1448 return -ENOSYS;
1449
1450 info_buf.Pad = 0;
1451
1452 if (attrs->ia_valid & ATTR_ATIME) {
1453 set_time = true;
1454 info_buf.LastAccessTime =
1455 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1456 } else
1457 info_buf.LastAccessTime = 0;
1458
1459 if (attrs->ia_valid & ATTR_MTIME) {
1460 set_time = true;
1461 info_buf.LastWriteTime =
1462 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1463 } else
1464 info_buf.LastWriteTime = 0;
1465
1466 /*
1467 * Samba throws this field away, but windows may actually use it.
1468 * Do not set ctime unless other time stamps are changed explicitly
1469 * (i.e. by utimes()) since we would then have a mix of client and
1470 * server times.
1471 */
1472 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1473 cifs_dbg(FYI, "CIFS - CTIME changed\n");
1474 info_buf.ChangeTime =
1475 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1476 } else
1477 info_buf.ChangeTime = 0;
1478
1479 info_buf.CreationTime = 0; /* don't change */
1480 info_buf.Attributes = cpu_to_le32(dosattr);
1481
1482 return server->ops->set_file_info(inode, full_path, &info_buf, xid);
1483}
1484
1485#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1486/*
1487 * Open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
1488 * and rename it to a random name that hopefully won't conflict with
1489 * anything else.
1490 */
1491int
1492cifs_rename_pending_delete(const char *full_path, struct dentry *dentry,
1493 const unsigned int xid)
1494{
1495 int oplock = 0;
1496 int rc;
1497 struct cifs_fid fid;
1498 struct cifs_open_parms oparms;
1499 struct inode *inode = d_inode(dentry);
1500 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1501 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1502 struct tcon_link *tlink;
1503 struct cifs_tcon *tcon;
1504 __u32 dosattr, origattr;
1505 FILE_BASIC_INFO *info_buf = NULL;
1506
1507 tlink = cifs_sb_tlink(cifs_sb);
1508 if (IS_ERR(tlink))
1509 return PTR_ERR(tlink);
1510 tcon = tlink_tcon(tlink);
1511
1512 /*
1513 * We cannot rename the file if the server doesn't support
1514 * CAP_INFOLEVEL_PASSTHRU
1515 */
1516 if (!(tcon->ses->capabilities & CAP_INFOLEVEL_PASSTHRU)) {
1517 rc = -EBUSY;
1518 goto out;
1519 }
1520
1521 oparms.tcon = tcon;
1522 oparms.cifs_sb = cifs_sb;
1523 oparms.desired_access = DELETE | FILE_WRITE_ATTRIBUTES;
1524 oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
1525 oparms.disposition = FILE_OPEN;
1526 oparms.path = full_path;
1527 oparms.fid = &fid;
1528 oparms.reconnect = false;
1529
1530 rc = CIFS_open(xid, &oparms, &oplock, NULL);
1531 if (rc != 0)
1532 goto out;
1533
1534 origattr = cifsInode->cifsAttrs;
1535 if (origattr == 0)
1536 origattr |= ATTR_NORMAL;
1537
1538 dosattr = origattr & ~ATTR_READONLY;
1539 if (dosattr == 0)
1540 dosattr |= ATTR_NORMAL;
1541 dosattr |= ATTR_HIDDEN;
1542
1543 /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
1544 if (dosattr != origattr) {
1545 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
1546 if (info_buf == NULL) {
1547 rc = -ENOMEM;
1548 goto out_close;
1549 }
1550 info_buf->Attributes = cpu_to_le32(dosattr);
1551 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid,
1552 current->tgid);
1553 /* although we would like to mark the file hidden
1554 if that fails we will still try to rename it */
1555 if (!rc)
1556 cifsInode->cifsAttrs = dosattr;
1557 else
1558 dosattr = origattr; /* since not able to change them */
1559 }
1560
1561 /* rename the file */
1562 rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, NULL,
1563 cifs_sb->local_nls,
1564 cifs_remap(cifs_sb));
1565 if (rc != 0) {
1566 rc = -EBUSY;
1567 goto undo_setattr;
1568 }
1569
1570 /* try to set DELETE_ON_CLOSE */
1571 if (!test_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags)) {
1572 rc = CIFSSMBSetFileDisposition(xid, tcon, true, fid.netfid,
1573 current->tgid);
1574 /*
1575 * some samba versions return -ENOENT when we try to set the
1576 * file disposition here. Likely a samba bug, but work around
1577 * it for now. This means that some cifsXXX files may hang
1578 * around after they shouldn't.
1579 *
1580 * BB: remove this hack after more servers have the fix
1581 */
1582 if (rc == -ENOENT)
1583 rc = 0;
1584 else if (rc != 0) {
1585 rc = -EBUSY;
1586 goto undo_rename;
1587 }
1588 set_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags);
1589 }
1590
1591out_close:
1592 CIFSSMBClose(xid, tcon, fid.netfid);
1593out:
1594 kfree(info_buf);
1595 cifs_put_tlink(tlink);
1596 return rc;
1597
1598 /*
1599 * reset everything back to the original state. Don't bother
1600 * dealing with errors here since we can't do anything about
1601 * them anyway.
1602 */
1603undo_rename:
1604 CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, dentry->d_name.name,
1605 cifs_sb->local_nls, cifs_remap(cifs_sb));
1606undo_setattr:
1607 if (dosattr != origattr) {
1608 info_buf->Attributes = cpu_to_le32(origattr);
1609 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid,
1610 current->tgid))
1611 cifsInode->cifsAttrs = origattr;
1612 }
1613
1614 goto out_close;
1615}
1616#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1617
1618/* copied from fs/nfs/dir.c with small changes */
1619static void
1620cifs_drop_nlink(struct inode *inode)
1621{
1622 spin_lock(&inode->i_lock);
1623 if (inode->i_nlink > 0)
1624 drop_nlink(inode);
1625 spin_unlock(&inode->i_lock);
1626}
1627
1628/*
1629 * If d_inode(dentry) is null (usually meaning the cached dentry
1630 * is a negative dentry) then we would attempt a standard SMB delete, but
1631 * if that fails we can not attempt the fall back mechanisms on EACCES
1632 * but will return the EACCES to the caller. Note that the VFS does not call
1633 * unlink on negative dentries currently.
1634 */
1635int cifs_unlink(struct inode *dir, struct dentry *dentry)
1636{
1637 int rc = 0;
1638 unsigned int xid;
1639 const char *full_path;
1640 void *page;
1641 struct inode *inode = d_inode(dentry);
1642 struct cifsInodeInfo *cifs_inode;
1643 struct super_block *sb = dir->i_sb;
1644 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1645 struct tcon_link *tlink;
1646 struct cifs_tcon *tcon;
1647 struct TCP_Server_Info *server;
1648 struct iattr *attrs = NULL;
1649 __u32 dosattr = 0, origattr = 0;
1650
1651 cifs_dbg(FYI, "cifs_unlink, dir=0x%p, dentry=0x%p\n", dir, dentry);
1652
1653 if (unlikely(cifs_forced_shutdown(cifs_sb)))
1654 return -EIO;
1655
1656 tlink = cifs_sb_tlink(cifs_sb);
1657 if (IS_ERR(tlink))
1658 return PTR_ERR(tlink);
1659 tcon = tlink_tcon(tlink);
1660 server = tcon->ses->server;
1661
1662 xid = get_xid();
1663 page = alloc_dentry_path();
1664
1665 if (tcon->nodelete) {
1666 rc = -EACCES;
1667 goto unlink_out;
1668 }
1669
1670 /* Unlink can be called from rename so we can not take the
1671 * sb->s_vfs_rename_mutex here */
1672 full_path = build_path_from_dentry(dentry, page);
1673 if (IS_ERR(full_path)) {
1674 rc = PTR_ERR(full_path);
1675 goto unlink_out;
1676 }
1677
1678 cifs_close_deferred_file_under_dentry(tcon, full_path);
1679#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1680 if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1681 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1682 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
1683 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
1684 cifs_remap(cifs_sb));
1685 cifs_dbg(FYI, "posix del rc %d\n", rc);
1686 if ((rc == 0) || (rc == -ENOENT))
1687 goto psx_del_no_retry;
1688 }
1689#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1690
1691retry_std_delete:
1692 if (!server->ops->unlink) {
1693 rc = -ENOSYS;
1694 goto psx_del_no_retry;
1695 }
1696
1697 rc = server->ops->unlink(xid, tcon, full_path, cifs_sb);
1698
1699psx_del_no_retry:
1700 if (!rc) {
1701 if (inode)
1702 cifs_drop_nlink(inode);
1703 } else if (rc == -ENOENT) {
1704 d_drop(dentry);
1705 } else if (rc == -EBUSY) {
1706 if (server->ops->rename_pending_delete) {
1707 rc = server->ops->rename_pending_delete(full_path,
1708 dentry, xid);
1709 if (rc == 0)
1710 cifs_drop_nlink(inode);
1711 }
1712 } else if ((rc == -EACCES) && (dosattr == 0) && inode) {
1713 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1714 if (attrs == NULL) {
1715 rc = -ENOMEM;
1716 goto out_reval;
1717 }
1718
1719 /* try to reset dos attributes */
1720 cifs_inode = CIFS_I(inode);
1721 origattr = cifs_inode->cifsAttrs;
1722 if (origattr == 0)
1723 origattr |= ATTR_NORMAL;
1724 dosattr = origattr & ~ATTR_READONLY;
1725 if (dosattr == 0)
1726 dosattr |= ATTR_NORMAL;
1727 dosattr |= ATTR_HIDDEN;
1728
1729 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1730 if (rc != 0)
1731 goto out_reval;
1732
1733 goto retry_std_delete;
1734 }
1735
1736 /* undo the setattr if we errored out and it's needed */
1737 if (rc != 0 && dosattr != 0)
1738 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
1739
1740out_reval:
1741 if (inode) {
1742 cifs_inode = CIFS_I(inode);
1743 cifs_inode->time = 0; /* will force revalidate to get info
1744 when needed */
1745 inode->i_ctime = current_time(inode);
1746 }
1747 dir->i_ctime = dir->i_mtime = current_time(dir);
1748 cifs_inode = CIFS_I(dir);
1749 CIFS_I(dir)->time = 0; /* force revalidate of dir as well */
1750unlink_out:
1751 free_dentry_path(page);
1752 kfree(attrs);
1753 free_xid(xid);
1754 cifs_put_tlink(tlink);
1755 return rc;
1756}
1757
1758static int
1759cifs_mkdir_qinfo(struct inode *parent, struct dentry *dentry, umode_t mode,
1760 const char *full_path, struct cifs_sb_info *cifs_sb,
1761 struct cifs_tcon *tcon, const unsigned int xid)
1762{
1763 int rc = 0;
1764 struct inode *inode = NULL;
1765
1766 if (tcon->posix_extensions)
1767 rc = smb311_posix_get_inode_info(&inode, full_path, parent->i_sb, xid);
1768#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1769 else if (tcon->unix_ext)
1770 rc = cifs_get_inode_info_unix(&inode, full_path, parent->i_sb,
1771 xid);
1772#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1773 else
1774 rc = cifs_get_inode_info(&inode, full_path, NULL, parent->i_sb,
1775 xid, NULL);
1776
1777 if (rc)
1778 return rc;
1779
1780 if (!S_ISDIR(inode->i_mode)) {
1781 /*
1782 * mkdir succeeded, but another client has managed to remove the
1783 * sucker and replace it with non-directory. Return success,
1784 * but don't leave the child in dcache.
1785 */
1786 iput(inode);
1787 d_drop(dentry);
1788 return 0;
1789 }
1790 /*
1791 * setting nlink not necessary except in cases where we failed to get it
1792 * from the server or was set bogus. Also, since this is a brand new
1793 * inode, no need to grab the i_lock before setting the i_nlink.
1794 */
1795 if (inode->i_nlink < 2)
1796 set_nlink(inode, 2);
1797 mode &= ~current_umask();
1798 /* must turn on setgid bit if parent dir has it */
1799 if (parent->i_mode & S_ISGID)
1800 mode |= S_ISGID;
1801
1802#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1803 if (tcon->unix_ext) {
1804 struct cifs_unix_set_info_args args = {
1805 .mode = mode,
1806 .ctime = NO_CHANGE_64,
1807 .atime = NO_CHANGE_64,
1808 .mtime = NO_CHANGE_64,
1809 .device = 0,
1810 };
1811 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1812 args.uid = current_fsuid();
1813 if (parent->i_mode & S_ISGID)
1814 args.gid = parent->i_gid;
1815 else
1816 args.gid = current_fsgid();
1817 } else {
1818 args.uid = INVALID_UID; /* no change */
1819 args.gid = INVALID_GID; /* no change */
1820 }
1821 CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
1822 cifs_sb->local_nls,
1823 cifs_remap(cifs_sb));
1824 } else {
1825#else
1826 {
1827#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1828 struct TCP_Server_Info *server = tcon->ses->server;
1829 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1830 (mode & S_IWUGO) == 0 && server->ops->mkdir_setinfo)
1831 server->ops->mkdir_setinfo(inode, full_path, cifs_sb,
1832 tcon, xid);
1833 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
1834 inode->i_mode = (mode | S_IFDIR);
1835
1836 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1837 inode->i_uid = current_fsuid();
1838 if (inode->i_mode & S_ISGID)
1839 inode->i_gid = parent->i_gid;
1840 else
1841 inode->i_gid = current_fsgid();
1842 }
1843 }
1844 d_instantiate(dentry, inode);
1845 return 0;
1846}
1847
1848#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1849static int
1850cifs_posix_mkdir(struct inode *inode, struct dentry *dentry, umode_t mode,
1851 const char *full_path, struct cifs_sb_info *cifs_sb,
1852 struct cifs_tcon *tcon, const unsigned int xid)
1853{
1854 int rc = 0;
1855 u32 oplock = 0;
1856 FILE_UNIX_BASIC_INFO *info = NULL;
1857 struct inode *newinode = NULL;
1858 struct cifs_fattr fattr;
1859
1860 info = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1861 if (info == NULL) {
1862 rc = -ENOMEM;
1863 goto posix_mkdir_out;
1864 }
1865
1866 mode &= ~current_umask();
1867 rc = CIFSPOSIXCreate(xid, tcon, SMB_O_DIRECTORY | SMB_O_CREAT, mode,
1868 NULL /* netfid */, info, &oplock, full_path,
1869 cifs_sb->local_nls, cifs_remap(cifs_sb));
1870 if (rc == -EOPNOTSUPP)
1871 goto posix_mkdir_out;
1872 else if (rc) {
1873 cifs_dbg(FYI, "posix mkdir returned 0x%x\n", rc);
1874 d_drop(dentry);
1875 goto posix_mkdir_out;
1876 }
1877
1878 if (info->Type == cpu_to_le32(-1))
1879 /* no return info, go query for it */
1880 goto posix_mkdir_get_info;
1881 /*
1882 * BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if
1883 * need to set uid/gid.
1884 */
1885
1886 cifs_unix_basic_to_fattr(&fattr, info, cifs_sb);
1887 cifs_fill_uniqueid(inode->i_sb, &fattr);
1888 newinode = cifs_iget(inode->i_sb, &fattr);
1889 if (!newinode)
1890 goto posix_mkdir_get_info;
1891
1892 d_instantiate(dentry, newinode);
1893
1894#ifdef CONFIG_CIFS_DEBUG2
1895 cifs_dbg(FYI, "instantiated dentry %p %pd to inode %p\n",
1896 dentry, dentry, newinode);
1897
1898 if (newinode->i_nlink != 2)
1899 cifs_dbg(FYI, "unexpected number of links %d\n",
1900 newinode->i_nlink);
1901#endif
1902
1903posix_mkdir_out:
1904 kfree(info);
1905 return rc;
1906posix_mkdir_get_info:
1907 rc = cifs_mkdir_qinfo(inode, dentry, mode, full_path, cifs_sb, tcon,
1908 xid);
1909 goto posix_mkdir_out;
1910}
1911#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1912
1913int cifs_mkdir(struct user_namespace *mnt_userns, struct inode *inode,
1914 struct dentry *direntry, umode_t mode)
1915{
1916 int rc = 0;
1917 unsigned int xid;
1918 struct cifs_sb_info *cifs_sb;
1919 struct tcon_link *tlink;
1920 struct cifs_tcon *tcon;
1921 struct TCP_Server_Info *server;
1922 const char *full_path;
1923 void *page;
1924
1925 cifs_dbg(FYI, "In cifs_mkdir, mode = %04ho inode = 0x%p\n",
1926 mode, inode);
1927
1928 cifs_sb = CIFS_SB(inode->i_sb);
1929 if (unlikely(cifs_forced_shutdown(cifs_sb)))
1930 return -EIO;
1931 tlink = cifs_sb_tlink(cifs_sb);
1932 if (IS_ERR(tlink))
1933 return PTR_ERR(tlink);
1934 tcon = tlink_tcon(tlink);
1935
1936 xid = get_xid();
1937
1938 page = alloc_dentry_path();
1939 full_path = build_path_from_dentry(direntry, page);
1940 if (IS_ERR(full_path)) {
1941 rc = PTR_ERR(full_path);
1942 goto mkdir_out;
1943 }
1944
1945 server = tcon->ses->server;
1946
1947 if ((server->ops->posix_mkdir) && (tcon->posix_extensions)) {
1948 rc = server->ops->posix_mkdir(xid, inode, mode, tcon, full_path,
1949 cifs_sb);
1950 d_drop(direntry); /* for time being always refresh inode info */
1951 goto mkdir_out;
1952 }
1953
1954#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1955 if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1956 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1957 rc = cifs_posix_mkdir(inode, direntry, mode, full_path, cifs_sb,
1958 tcon, xid);
1959 if (rc != -EOPNOTSUPP)
1960 goto mkdir_out;
1961 }
1962#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1963
1964 if (!server->ops->mkdir) {
1965 rc = -ENOSYS;
1966 goto mkdir_out;
1967 }
1968
1969 /* BB add setting the equivalent of mode via CreateX w/ACLs */
1970 rc = server->ops->mkdir(xid, inode, mode, tcon, full_path, cifs_sb);
1971 if (rc) {
1972 cifs_dbg(FYI, "cifs_mkdir returned 0x%x\n", rc);
1973 d_drop(direntry);
1974 goto mkdir_out;
1975 }
1976
1977 /* TODO: skip this for smb2/smb3 */
1978 rc = cifs_mkdir_qinfo(inode, direntry, mode, full_path, cifs_sb, tcon,
1979 xid);
1980mkdir_out:
1981 /*
1982 * Force revalidate to get parent dir info when needed since cached
1983 * attributes are invalid now.
1984 */
1985 CIFS_I(inode)->time = 0;
1986 free_dentry_path(page);
1987 free_xid(xid);
1988 cifs_put_tlink(tlink);
1989 return rc;
1990}
1991
1992int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1993{
1994 int rc = 0;
1995 unsigned int xid;
1996 struct cifs_sb_info *cifs_sb;
1997 struct tcon_link *tlink;
1998 struct cifs_tcon *tcon;
1999 struct TCP_Server_Info *server;
2000 const char *full_path;
2001 void *page = alloc_dentry_path();
2002 struct cifsInodeInfo *cifsInode;
2003
2004 cifs_dbg(FYI, "cifs_rmdir, inode = 0x%p\n", inode);
2005
2006 xid = get_xid();
2007
2008 full_path = build_path_from_dentry(direntry, page);
2009 if (IS_ERR(full_path)) {
2010 rc = PTR_ERR(full_path);
2011 goto rmdir_exit;
2012 }
2013
2014 cifs_sb = CIFS_SB(inode->i_sb);
2015 if (unlikely(cifs_forced_shutdown(cifs_sb))) {
2016 rc = -EIO;
2017 goto rmdir_exit;
2018 }
2019
2020 tlink = cifs_sb_tlink(cifs_sb);
2021 if (IS_ERR(tlink)) {
2022 rc = PTR_ERR(tlink);
2023 goto rmdir_exit;
2024 }
2025 tcon = tlink_tcon(tlink);
2026 server = tcon->ses->server;
2027
2028 if (!server->ops->rmdir) {
2029 rc = -ENOSYS;
2030 cifs_put_tlink(tlink);
2031 goto rmdir_exit;
2032 }
2033
2034 if (tcon->nodelete) {
2035 rc = -EACCES;
2036 cifs_put_tlink(tlink);
2037 goto rmdir_exit;
2038 }
2039
2040 rc = server->ops->rmdir(xid, tcon, full_path, cifs_sb);
2041 cifs_put_tlink(tlink);
2042
2043 if (!rc) {
2044 spin_lock(&d_inode(direntry)->i_lock);
2045 i_size_write(d_inode(direntry), 0);
2046 clear_nlink(d_inode(direntry));
2047 spin_unlock(&d_inode(direntry)->i_lock);
2048 }
2049
2050 cifsInode = CIFS_I(d_inode(direntry));
2051 /* force revalidate to go get info when needed */
2052 cifsInode->time = 0;
2053
2054 cifsInode = CIFS_I(inode);
2055 /*
2056 * Force revalidate to get parent dir info when needed since cached
2057 * attributes are invalid now.
2058 */
2059 cifsInode->time = 0;
2060
2061 d_inode(direntry)->i_ctime = inode->i_ctime = inode->i_mtime =
2062 current_time(inode);
2063
2064rmdir_exit:
2065 free_dentry_path(page);
2066 free_xid(xid);
2067 return rc;
2068}
2069
2070static int
2071cifs_do_rename(const unsigned int xid, struct dentry *from_dentry,
2072 const char *from_path, struct dentry *to_dentry,
2073 const char *to_path)
2074{
2075 struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
2076 struct tcon_link *tlink;
2077 struct cifs_tcon *tcon;
2078 struct TCP_Server_Info *server;
2079#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2080 struct cifs_fid fid;
2081 struct cifs_open_parms oparms;
2082 int oplock;
2083#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2084 int rc;
2085
2086 tlink = cifs_sb_tlink(cifs_sb);
2087 if (IS_ERR(tlink))
2088 return PTR_ERR(tlink);
2089 tcon = tlink_tcon(tlink);
2090 server = tcon->ses->server;
2091
2092 if (!server->ops->rename)
2093 return -ENOSYS;
2094
2095 /* try path-based rename first */
2096 rc = server->ops->rename(xid, tcon, from_path, to_path, cifs_sb);
2097
2098 /*
2099 * Don't bother with rename by filehandle unless file is busy and
2100 * source. Note that cross directory moves do not work with
2101 * rename by filehandle to various Windows servers.
2102 */
2103 if (rc == 0 || rc != -EBUSY)
2104 goto do_rename_exit;
2105
2106 /* Don't fall back to using SMB on SMB 2+ mount */
2107 if (server->vals->protocol_id != 0)
2108 goto do_rename_exit;
2109
2110#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2111 /* open-file renames don't work across directories */
2112 if (to_dentry->d_parent != from_dentry->d_parent)
2113 goto do_rename_exit;
2114
2115 oparms.tcon = tcon;
2116 oparms.cifs_sb = cifs_sb;
2117 /* open the file to be renamed -- we need DELETE perms */
2118 oparms.desired_access = DELETE;
2119 oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
2120 oparms.disposition = FILE_OPEN;
2121 oparms.path = from_path;
2122 oparms.fid = &fid;
2123 oparms.reconnect = false;
2124
2125 rc = CIFS_open(xid, &oparms, &oplock, NULL);
2126 if (rc == 0) {
2127 rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid,
2128 (const char *) to_dentry->d_name.name,
2129 cifs_sb->local_nls, cifs_remap(cifs_sb));
2130 CIFSSMBClose(xid, tcon, fid.netfid);
2131 }
2132#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2133do_rename_exit:
2134 if (rc == 0)
2135 d_move(from_dentry, to_dentry);
2136 cifs_put_tlink(tlink);
2137 return rc;
2138}
2139
2140int
2141cifs_rename2(struct user_namespace *mnt_userns, struct inode *source_dir,
2142 struct dentry *source_dentry, struct inode *target_dir,
2143 struct dentry *target_dentry, unsigned int flags)
2144{
2145 const char *from_name, *to_name;
2146 void *page1, *page2;
2147 struct cifs_sb_info *cifs_sb;
2148 struct tcon_link *tlink;
2149 struct cifs_tcon *tcon;
2150 unsigned int xid;
2151 int rc, tmprc;
2152 int retry_count = 0;
2153 FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
2154#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2155 FILE_UNIX_BASIC_INFO *info_buf_target;
2156#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2157
2158 if (flags & ~RENAME_NOREPLACE)
2159 return -EINVAL;
2160
2161 cifs_sb = CIFS_SB(source_dir->i_sb);
2162 if (unlikely(cifs_forced_shutdown(cifs_sb)))
2163 return -EIO;
2164
2165 tlink = cifs_sb_tlink(cifs_sb);
2166 if (IS_ERR(tlink))
2167 return PTR_ERR(tlink);
2168 tcon = tlink_tcon(tlink);
2169
2170 page1 = alloc_dentry_path();
2171 page2 = alloc_dentry_path();
2172 xid = get_xid();
2173
2174 from_name = build_path_from_dentry(source_dentry, page1);
2175 if (IS_ERR(from_name)) {
2176 rc = PTR_ERR(from_name);
2177 goto cifs_rename_exit;
2178 }
2179
2180 to_name = build_path_from_dentry(target_dentry, page2);
2181 if (IS_ERR(to_name)) {
2182 rc = PTR_ERR(to_name);
2183 goto cifs_rename_exit;
2184 }
2185
2186 cifs_close_deferred_file_under_dentry(tcon, from_name);
2187 if (d_inode(target_dentry) != NULL)
2188 cifs_close_deferred_file_under_dentry(tcon, to_name);
2189
2190 rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
2191 to_name);
2192
2193 if (rc == -EACCES) {
2194 while (retry_count < 3) {
2195 cifs_close_all_deferred_files(tcon);
2196 rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
2197 to_name);
2198 if (rc != -EACCES)
2199 break;
2200 retry_count++;
2201 }
2202 }
2203
2204 /*
2205 * No-replace is the natural behavior for CIFS, so skip unlink hacks.
2206 */
2207 if (flags & RENAME_NOREPLACE)
2208 goto cifs_rename_exit;
2209
2210#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2211 if (rc == -EEXIST && tcon->unix_ext) {
2212 /*
2213 * Are src and dst hardlinks of same inode? We can only tell
2214 * with unix extensions enabled.
2215 */
2216 info_buf_source =
2217 kmalloc_array(2, sizeof(FILE_UNIX_BASIC_INFO),
2218 GFP_KERNEL);
2219 if (info_buf_source == NULL) {
2220 rc = -ENOMEM;
2221 goto cifs_rename_exit;
2222 }
2223
2224 info_buf_target = info_buf_source + 1;
2225 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, from_name,
2226 info_buf_source,
2227 cifs_sb->local_nls,
2228 cifs_remap(cifs_sb));
2229 if (tmprc != 0)
2230 goto unlink_target;
2231
2232 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, to_name,
2233 info_buf_target,
2234 cifs_sb->local_nls,
2235 cifs_remap(cifs_sb));
2236
2237 if (tmprc == 0 && (info_buf_source->UniqueId ==
2238 info_buf_target->UniqueId)) {
2239 /* same file, POSIX says that this is a noop */
2240 rc = 0;
2241 goto cifs_rename_exit;
2242 }
2243 }
2244 /*
2245 * else ... BB we could add the same check for Windows by
2246 * checking the UniqueId via FILE_INTERNAL_INFO
2247 */
2248
2249unlink_target:
2250#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2251
2252 /* Try unlinking the target dentry if it's not negative */
2253 if (d_really_is_positive(target_dentry) && (rc == -EACCES || rc == -EEXIST)) {
2254 if (d_is_dir(target_dentry))
2255 tmprc = cifs_rmdir(target_dir, target_dentry);
2256 else
2257 tmprc = cifs_unlink(target_dir, target_dentry);
2258 if (tmprc)
2259 goto cifs_rename_exit;
2260 rc = cifs_do_rename(xid, source_dentry, from_name,
2261 target_dentry, to_name);
2262 }
2263
2264 /* force revalidate to go get info when needed */
2265 CIFS_I(source_dir)->time = CIFS_I(target_dir)->time = 0;
2266
2267 source_dir->i_ctime = source_dir->i_mtime = target_dir->i_ctime =
2268 target_dir->i_mtime = current_time(source_dir);
2269
2270cifs_rename_exit:
2271 kfree(info_buf_source);
2272 free_dentry_path(page2);
2273 free_dentry_path(page1);
2274 free_xid(xid);
2275 cifs_put_tlink(tlink);
2276 return rc;
2277}
2278
2279static bool
2280cifs_dentry_needs_reval(struct dentry *dentry)
2281{
2282 struct inode *inode = d_inode(dentry);
2283 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
2284 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2285 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
2286 struct cached_fid *cfid = NULL;
2287
2288 if (cifs_i->time == 0)
2289 return true;
2290
2291 if (CIFS_CACHE_READ(cifs_i))
2292 return false;
2293
2294 if (!lookupCacheEnabled)
2295 return true;
2296
2297 if (!open_cached_dir_by_dentry(tcon, dentry->d_parent, &cfid)) {
2298 spin_lock(&cfid->fid_lock);
2299 if (cfid->time && cifs_i->time > cfid->time) {
2300 spin_unlock(&cfid->fid_lock);
2301 close_cached_dir(cfid);
2302 return false;
2303 }
2304 spin_unlock(&cfid->fid_lock);
2305 close_cached_dir(cfid);
2306 }
2307 /*
2308 * depending on inode type, check if attribute caching disabled for
2309 * files or directories
2310 */
2311 if (S_ISDIR(inode->i_mode)) {
2312 if (!cifs_sb->ctx->acdirmax)
2313 return true;
2314 if (!time_in_range(jiffies, cifs_i->time,
2315 cifs_i->time + cifs_sb->ctx->acdirmax))
2316 return true;
2317 } else { /* file */
2318 if (!cifs_sb->ctx->acregmax)
2319 return true;
2320 if (!time_in_range(jiffies, cifs_i->time,
2321 cifs_i->time + cifs_sb->ctx->acregmax))
2322 return true;
2323 }
2324
2325 /* hardlinked files w/ noserverino get "special" treatment */
2326 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
2327 S_ISREG(inode->i_mode) && inode->i_nlink != 1)
2328 return true;
2329
2330 return false;
2331}
2332
2333/*
2334 * Zap the cache. Called when invalid_mapping flag is set.
2335 */
2336int
2337cifs_invalidate_mapping(struct inode *inode)
2338{
2339 int rc = 0;
2340
2341 if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
2342 rc = invalidate_inode_pages2(inode->i_mapping);
2343 if (rc)
2344 cifs_dbg(VFS, "%s: Could not invalidate inode %p\n",
2345 __func__, inode);
2346 }
2347
2348 return rc;
2349}
2350
2351/**
2352 * cifs_wait_bit_killable - helper for functions that are sleeping on bit locks
2353 *
2354 * @key: currently unused
2355 * @mode: the task state to sleep in
2356 */
2357static int
2358cifs_wait_bit_killable(struct wait_bit_key *key, int mode)
2359{
2360 schedule();
2361 if (signal_pending_state(mode, current))
2362 return -ERESTARTSYS;
2363 return 0;
2364}
2365
2366int
2367cifs_revalidate_mapping(struct inode *inode)
2368{
2369 int rc;
2370 unsigned long *flags = &CIFS_I(inode)->flags;
2371 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2372
2373 /* swapfiles are not supposed to be shared */
2374 if (IS_SWAPFILE(inode))
2375 return 0;
2376
2377 rc = wait_on_bit_lock_action(flags, CIFS_INO_LOCK, cifs_wait_bit_killable,
2378 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
2379 if (rc)
2380 return rc;
2381
2382 if (test_and_clear_bit(CIFS_INO_INVALID_MAPPING, flags)) {
2383 /* for cache=singleclient, do not invalidate */
2384 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
2385 goto skip_invalidate;
2386
2387 rc = cifs_invalidate_mapping(inode);
2388 if (rc)
2389 set_bit(CIFS_INO_INVALID_MAPPING, flags);
2390 }
2391
2392skip_invalidate:
2393 clear_bit_unlock(CIFS_INO_LOCK, flags);
2394 smp_mb__after_atomic();
2395 wake_up_bit(flags, CIFS_INO_LOCK);
2396
2397 return rc;
2398}
2399
2400int
2401cifs_zap_mapping(struct inode *inode)
2402{
2403 set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(inode)->flags);
2404 return cifs_revalidate_mapping(inode);
2405}
2406
2407int cifs_revalidate_file_attr(struct file *filp)
2408{
2409 int rc = 0;
2410 struct dentry *dentry = file_dentry(filp);
2411#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2412 struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
2413#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2414
2415 if (!cifs_dentry_needs_reval(dentry))
2416 return rc;
2417
2418#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2419 if (tlink_tcon(cfile->tlink)->unix_ext)
2420 rc = cifs_get_file_info_unix(filp);
2421 else
2422#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2423 rc = cifs_get_file_info(filp);
2424
2425 return rc;
2426}
2427
2428int cifs_revalidate_dentry_attr(struct dentry *dentry)
2429{
2430 unsigned int xid;
2431 int rc = 0;
2432 struct inode *inode = d_inode(dentry);
2433 struct super_block *sb = dentry->d_sb;
2434 const char *full_path;
2435 void *page;
2436 int count = 0;
2437
2438 if (inode == NULL)
2439 return -ENOENT;
2440
2441 if (!cifs_dentry_needs_reval(dentry))
2442 return rc;
2443
2444 xid = get_xid();
2445
2446 page = alloc_dentry_path();
2447 full_path = build_path_from_dentry(dentry, page);
2448 if (IS_ERR(full_path)) {
2449 rc = PTR_ERR(full_path);
2450 goto out;
2451 }
2452
2453 cifs_dbg(FYI, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time %ld jiffies %ld\n",
2454 full_path, inode, inode->i_count.counter,
2455 dentry, cifs_get_time(dentry), jiffies);
2456
2457again:
2458 if (cifs_sb_master_tcon(CIFS_SB(sb))->posix_extensions)
2459 rc = smb311_posix_get_inode_info(&inode, full_path, sb, xid);
2460 else if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
2461 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
2462 else
2463 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
2464 xid, NULL);
2465 if (rc == -EAGAIN && count++ < 10)
2466 goto again;
2467out:
2468 free_dentry_path(page);
2469 free_xid(xid);
2470
2471 return rc;
2472}
2473
2474int cifs_revalidate_file(struct file *filp)
2475{
2476 int rc;
2477 struct inode *inode = file_inode(filp);
2478
2479 rc = cifs_revalidate_file_attr(filp);
2480 if (rc)
2481 return rc;
2482
2483 return cifs_revalidate_mapping(inode);
2484}
2485
2486/* revalidate a dentry's inode attributes */
2487int cifs_revalidate_dentry(struct dentry *dentry)
2488{
2489 int rc;
2490 struct inode *inode = d_inode(dentry);
2491
2492 rc = cifs_revalidate_dentry_attr(dentry);
2493 if (rc)
2494 return rc;
2495
2496 return cifs_revalidate_mapping(inode);
2497}
2498
2499int cifs_getattr(struct user_namespace *mnt_userns, const struct path *path,
2500 struct kstat *stat, u32 request_mask, unsigned int flags)
2501{
2502 struct dentry *dentry = path->dentry;
2503 struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
2504 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
2505 struct inode *inode = d_inode(dentry);
2506 int rc;
2507
2508 if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb))))
2509 return -EIO;
2510
2511 /*
2512 * We need to be sure that all dirty pages are written and the server
2513 * has actual ctime, mtime and file length.
2514 */
2515 if ((request_mask & (STATX_CTIME | STATX_MTIME | STATX_SIZE | STATX_BLOCKS)) &&
2516 !CIFS_CACHE_READ(CIFS_I(inode)) &&
2517 inode->i_mapping && inode->i_mapping->nrpages != 0) {
2518 rc = filemap_fdatawait(inode->i_mapping);
2519 if (rc) {
2520 mapping_set_error(inode->i_mapping, rc);
2521 return rc;
2522 }
2523 }
2524
2525 if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_FORCE_SYNC)
2526 CIFS_I(inode)->time = 0; /* force revalidate */
2527
2528 /*
2529 * If the caller doesn't require syncing, only sync if
2530 * necessary (e.g. due to earlier truncate or setattr
2531 * invalidating the cached metadata)
2532 */
2533 if (((flags & AT_STATX_SYNC_TYPE) != AT_STATX_DONT_SYNC) ||
2534 (CIFS_I(inode)->time == 0)) {
2535 rc = cifs_revalidate_dentry_attr(dentry);
2536 if (rc)
2537 return rc;
2538 }
2539
2540 generic_fillattr(&init_user_ns, inode, stat);
2541 stat->blksize = cifs_sb->ctx->bsize;
2542 stat->ino = CIFS_I(inode)->uniqueid;
2543
2544 /* old CIFS Unix Extensions doesn't return create time */
2545 if (CIFS_I(inode)->createtime) {
2546 stat->result_mask |= STATX_BTIME;
2547 stat->btime =
2548 cifs_NTtimeToUnix(cpu_to_le64(CIFS_I(inode)->createtime));
2549 }
2550
2551 stat->attributes_mask |= (STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED);
2552 if (CIFS_I(inode)->cifsAttrs & FILE_ATTRIBUTE_COMPRESSED)
2553 stat->attributes |= STATX_ATTR_COMPRESSED;
2554 if (CIFS_I(inode)->cifsAttrs & FILE_ATTRIBUTE_ENCRYPTED)
2555 stat->attributes |= STATX_ATTR_ENCRYPTED;
2556
2557 /*
2558 * If on a multiuser mount without unix extensions or cifsacl being
2559 * enabled, and the admin hasn't overridden them, set the ownership
2560 * to the fsuid/fsgid of the current process.
2561 */
2562 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
2563 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
2564 !tcon->unix_ext) {
2565 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
2566 stat->uid = current_fsuid();
2567 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
2568 stat->gid = current_fsgid();
2569 }
2570 return 0;
2571}
2572
2573int cifs_fiemap(struct inode *inode, struct fiemap_extent_info *fei, u64 start,
2574 u64 len)
2575{
2576 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
2577 struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_i->netfs.inode.i_sb);
2578 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
2579 struct TCP_Server_Info *server = tcon->ses->server;
2580 struct cifsFileInfo *cfile;
2581 int rc;
2582
2583 if (unlikely(cifs_forced_shutdown(cifs_sb)))
2584 return -EIO;
2585
2586 /*
2587 * We need to be sure that all dirty pages are written as they
2588 * might fill holes on the server.
2589 */
2590 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
2591 inode->i_mapping->nrpages != 0) {
2592 rc = filemap_fdatawait(inode->i_mapping);
2593 if (rc) {
2594 mapping_set_error(inode->i_mapping, rc);
2595 return rc;
2596 }
2597 }
2598
2599 cfile = find_readable_file(cifs_i, false);
2600 if (cfile == NULL)
2601 return -EINVAL;
2602
2603 if (server->ops->fiemap) {
2604 rc = server->ops->fiemap(tcon, cfile, fei, start, len);
2605 cifsFileInfo_put(cfile);
2606 return rc;
2607 }
2608
2609 cifsFileInfo_put(cfile);
2610 return -ENOTSUPP;
2611}
2612
2613int cifs_truncate_page(struct address_space *mapping, loff_t from)
2614{
2615 pgoff_t index = from >> PAGE_SHIFT;
2616 unsigned offset = from & (PAGE_SIZE - 1);
2617 struct page *page;
2618 int rc = 0;
2619
2620 page = grab_cache_page(mapping, index);
2621 if (!page)
2622 return -ENOMEM;
2623
2624 zero_user_segment(page, offset, PAGE_SIZE);
2625 unlock_page(page);
2626 put_page(page);
2627 return rc;
2628}
2629
2630void cifs_setsize(struct inode *inode, loff_t offset)
2631{
2632 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
2633
2634 spin_lock(&inode->i_lock);
2635 i_size_write(inode, offset);
2636 spin_unlock(&inode->i_lock);
2637
2638 /* Cached inode must be refreshed on truncate */
2639 cifs_i->time = 0;
2640 truncate_pagecache(inode, offset);
2641}
2642
2643static int
2644cifs_set_file_size(struct inode *inode, struct iattr *attrs,
2645 unsigned int xid, const char *full_path)
2646{
2647 int rc;
2648 struct cifsFileInfo *open_file;
2649 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2650 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2651 struct tcon_link *tlink = NULL;
2652 struct cifs_tcon *tcon = NULL;
2653 struct TCP_Server_Info *server;
2654
2655 /*
2656 * To avoid spurious oplock breaks from server, in the case of
2657 * inodes that we already have open, avoid doing path based
2658 * setting of file size if we can do it by handle.
2659 * This keeps our caching token (oplock) and avoids timeouts
2660 * when the local oplock break takes longer to flush
2661 * writebehind data than the SMB timeout for the SetPathInfo
2662 * request would allow
2663 */
2664 open_file = find_writable_file(cifsInode, FIND_WR_FSUID_ONLY);
2665 if (open_file) {
2666 tcon = tlink_tcon(open_file->tlink);
2667 server = tcon->ses->server;
2668 if (server->ops->set_file_size)
2669 rc = server->ops->set_file_size(xid, tcon, open_file,
2670 attrs->ia_size, false);
2671 else
2672 rc = -ENOSYS;
2673 cifsFileInfo_put(open_file);
2674 cifs_dbg(FYI, "SetFSize for attrs rc = %d\n", rc);
2675 } else
2676 rc = -EINVAL;
2677
2678 if (!rc)
2679 goto set_size_out;
2680
2681 if (tcon == NULL) {
2682 tlink = cifs_sb_tlink(cifs_sb);
2683 if (IS_ERR(tlink))
2684 return PTR_ERR(tlink);
2685 tcon = tlink_tcon(tlink);
2686 server = tcon->ses->server;
2687 }
2688
2689 /*
2690 * Set file size by pathname rather than by handle either because no
2691 * valid, writeable file handle for it was found or because there was
2692 * an error setting it by handle.
2693 */
2694 if (server->ops->set_path_size)
2695 rc = server->ops->set_path_size(xid, tcon, full_path,
2696 attrs->ia_size, cifs_sb, false);
2697 else
2698 rc = -ENOSYS;
2699 cifs_dbg(FYI, "SetEOF by path (setattrs) rc = %d\n", rc);
2700
2701 if (tlink)
2702 cifs_put_tlink(tlink);
2703
2704set_size_out:
2705 if (rc == 0) {
2706 cifsInode->server_eof = attrs->ia_size;
2707 cifs_setsize(inode, attrs->ia_size);
2708 /*
2709 * i_blocks is not related to (i_size / i_blksize), but instead
2710 * 512 byte (2**9) size is required for calculating num blocks.
2711 * Until we can query the server for actual allocation size,
2712 * this is best estimate we have for blocks allocated for a file
2713 * Number of blocks must be rounded up so size 1 is not 0 blocks
2714 */
2715 inode->i_blocks = (512 - 1 + attrs->ia_size) >> 9;
2716
2717 /*
2718 * The man page of truncate says if the size changed,
2719 * then the st_ctime and st_mtime fields for the file
2720 * are updated.
2721 */
2722 attrs->ia_ctime = attrs->ia_mtime = current_time(inode);
2723 attrs->ia_valid |= ATTR_CTIME | ATTR_MTIME;
2724
2725 cifs_truncate_page(inode->i_mapping, inode->i_size);
2726 }
2727
2728 return rc;
2729}
2730
2731#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2732static int
2733cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
2734{
2735 int rc;
2736 unsigned int xid;
2737 const char *full_path;
2738 void *page = alloc_dentry_path();
2739 struct inode *inode = d_inode(direntry);
2740 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2741 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2742 struct tcon_link *tlink;
2743 struct cifs_tcon *pTcon;
2744 struct cifs_unix_set_info_args *args = NULL;
2745 struct cifsFileInfo *open_file;
2746
2747 cifs_dbg(FYI, "setattr_unix on file %pd attrs->ia_valid=0x%x\n",
2748 direntry, attrs->ia_valid);
2749
2750 xid = get_xid();
2751
2752 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2753 attrs->ia_valid |= ATTR_FORCE;
2754
2755 rc = setattr_prepare(&init_user_ns, direntry, attrs);
2756 if (rc < 0)
2757 goto out;
2758
2759 full_path = build_path_from_dentry(direntry, page);
2760 if (IS_ERR(full_path)) {
2761 rc = PTR_ERR(full_path);
2762 goto out;
2763 }
2764
2765 /*
2766 * Attempt to flush data before changing attributes. We need to do
2767 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2768 * ownership or mode then we may also need to do this. Here, we take
2769 * the safe way out and just do the flush on all setattr requests. If
2770 * the flush returns error, store it to report later and continue.
2771 *
2772 * BB: This should be smarter. Why bother flushing pages that
2773 * will be truncated anyway? Also, should we error out here if
2774 * the flush returns error?
2775 */
2776 rc = filemap_write_and_wait(inode->i_mapping);
2777 if (is_interrupt_error(rc)) {
2778 rc = -ERESTARTSYS;
2779 goto out;
2780 }
2781
2782 mapping_set_error(inode->i_mapping, rc);
2783 rc = 0;
2784
2785 if (attrs->ia_valid & ATTR_SIZE) {
2786 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2787 if (rc != 0)
2788 goto out;
2789 }
2790
2791 /* skip mode change if it's just for clearing setuid/setgid */
2792 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2793 attrs->ia_valid &= ~ATTR_MODE;
2794
2795 args = kmalloc(sizeof(*args), GFP_KERNEL);
2796 if (args == NULL) {
2797 rc = -ENOMEM;
2798 goto out;
2799 }
2800
2801 /* set up the struct */
2802 if (attrs->ia_valid & ATTR_MODE)
2803 args->mode = attrs->ia_mode;
2804 else
2805 args->mode = NO_CHANGE_64;
2806
2807 if (attrs->ia_valid & ATTR_UID)
2808 args->uid = attrs->ia_uid;
2809 else
2810 args->uid = INVALID_UID; /* no change */
2811
2812 if (attrs->ia_valid & ATTR_GID)
2813 args->gid = attrs->ia_gid;
2814 else
2815 args->gid = INVALID_GID; /* no change */
2816
2817 if (attrs->ia_valid & ATTR_ATIME)
2818 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
2819 else
2820 args->atime = NO_CHANGE_64;
2821
2822 if (attrs->ia_valid & ATTR_MTIME)
2823 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
2824 else
2825 args->mtime = NO_CHANGE_64;
2826
2827 if (attrs->ia_valid & ATTR_CTIME)
2828 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
2829 else
2830 args->ctime = NO_CHANGE_64;
2831
2832 args->device = 0;
2833 open_file = find_writable_file(cifsInode, FIND_WR_FSUID_ONLY);
2834 if (open_file) {
2835 u16 nfid = open_file->fid.netfid;
2836 u32 npid = open_file->pid;
2837 pTcon = tlink_tcon(open_file->tlink);
2838 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
2839 cifsFileInfo_put(open_file);
2840 } else {
2841 tlink = cifs_sb_tlink(cifs_sb);
2842 if (IS_ERR(tlink)) {
2843 rc = PTR_ERR(tlink);
2844 goto out;
2845 }
2846 pTcon = tlink_tcon(tlink);
2847 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
2848 cifs_sb->local_nls,
2849 cifs_remap(cifs_sb));
2850 cifs_put_tlink(tlink);
2851 }
2852
2853 if (rc)
2854 goto out;
2855
2856 if ((attrs->ia_valid & ATTR_SIZE) &&
2857 attrs->ia_size != i_size_read(inode)) {
2858 truncate_setsize(inode, attrs->ia_size);
2859 fscache_resize_cookie(cifs_inode_cookie(inode), attrs->ia_size);
2860 }
2861
2862 setattr_copy(&init_user_ns, inode, attrs);
2863 mark_inode_dirty(inode);
2864
2865 /* force revalidate when any of these times are set since some
2866 of the fs types (eg ext3, fat) do not have fine enough
2867 time granularity to match protocol, and we do not have a
2868 a way (yet) to query the server fs's time granularity (and
2869 whether it rounds times down).
2870 */
2871 if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
2872 cifsInode->time = 0;
2873out:
2874 kfree(args);
2875 free_dentry_path(page);
2876 free_xid(xid);
2877 return rc;
2878}
2879#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2880
2881static int
2882cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
2883{
2884 unsigned int xid;
2885 kuid_t uid = INVALID_UID;
2886 kgid_t gid = INVALID_GID;
2887 struct inode *inode = d_inode(direntry);
2888 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2889 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2890 struct cifsFileInfo *wfile;
2891 struct cifs_tcon *tcon;
2892 const char *full_path;
2893 void *page = alloc_dentry_path();
2894 int rc = -EACCES;
2895 __u32 dosattr = 0;
2896 __u64 mode = NO_CHANGE_64;
2897
2898 xid = get_xid();
2899
2900 cifs_dbg(FYI, "setattr on file %pd attrs->ia_valid 0x%x\n",
2901 direntry, attrs->ia_valid);
2902
2903 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2904 attrs->ia_valid |= ATTR_FORCE;
2905
2906 rc = setattr_prepare(&init_user_ns, direntry, attrs);
2907 if (rc < 0)
2908 goto cifs_setattr_exit;
2909
2910 full_path = build_path_from_dentry(direntry, page);
2911 if (IS_ERR(full_path)) {
2912 rc = PTR_ERR(full_path);
2913 goto cifs_setattr_exit;
2914 }
2915
2916 /*
2917 * Attempt to flush data before changing attributes. We need to do
2918 * this for ATTR_SIZE and ATTR_MTIME. If the flush of the data
2919 * returns error, store it to report later and continue.
2920 *
2921 * BB: This should be smarter. Why bother flushing pages that
2922 * will be truncated anyway? Also, should we error out here if
2923 * the flush returns error? Do we need to check for ATTR_MTIME_SET flag?
2924 */
2925 if (attrs->ia_valid & (ATTR_MTIME | ATTR_SIZE | ATTR_CTIME)) {
2926 rc = filemap_write_and_wait(inode->i_mapping);
2927 if (is_interrupt_error(rc)) {
2928 rc = -ERESTARTSYS;
2929 goto cifs_setattr_exit;
2930 }
2931 mapping_set_error(inode->i_mapping, rc);
2932 }
2933
2934 rc = 0;
2935
2936 if ((attrs->ia_valid & ATTR_MTIME) &&
2937 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) {
2938 rc = cifs_get_writable_file(cifsInode, FIND_WR_ANY, &wfile);
2939 if (!rc) {
2940 tcon = tlink_tcon(wfile->tlink);
2941 rc = tcon->ses->server->ops->flush(xid, tcon, &wfile->fid);
2942 cifsFileInfo_put(wfile);
2943 if (rc)
2944 goto cifs_setattr_exit;
2945 } else if (rc != -EBADF)
2946 goto cifs_setattr_exit;
2947 else
2948 rc = 0;
2949 }
2950
2951 if (attrs->ia_valid & ATTR_SIZE) {
2952 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2953 if (rc != 0)
2954 goto cifs_setattr_exit;
2955 }
2956
2957 if (attrs->ia_valid & ATTR_UID)
2958 uid = attrs->ia_uid;
2959
2960 if (attrs->ia_valid & ATTR_GID)
2961 gid = attrs->ia_gid;
2962
2963 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) ||
2964 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)) {
2965 if (uid_valid(uid) || gid_valid(gid)) {
2966 mode = NO_CHANGE_64;
2967 rc = id_mode_to_cifs_acl(inode, full_path, &mode,
2968 uid, gid);
2969 if (rc) {
2970 cifs_dbg(FYI, "%s: Setting id failed with error: %d\n",
2971 __func__, rc);
2972 goto cifs_setattr_exit;
2973 }
2974 }
2975 } else
2976 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
2977 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
2978
2979 /* skip mode change if it's just for clearing setuid/setgid */
2980 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2981 attrs->ia_valid &= ~ATTR_MODE;
2982
2983 if (attrs->ia_valid & ATTR_MODE) {
2984 mode = attrs->ia_mode;
2985 rc = 0;
2986 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) ||
2987 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)) {
2988 rc = id_mode_to_cifs_acl(inode, full_path, &mode,
2989 INVALID_UID, INVALID_GID);
2990 if (rc) {
2991 cifs_dbg(FYI, "%s: Setting ACL failed with error: %d\n",
2992 __func__, rc);
2993 goto cifs_setattr_exit;
2994 }
2995
2996 /*
2997 * In case of CIFS_MOUNT_CIFS_ACL, we cannot support all modes.
2998 * Pick up the actual mode bits that were set.
2999 */
3000 if (mode != attrs->ia_mode)
3001 attrs->ia_mode = mode;
3002 } else
3003 if (((mode & S_IWUGO) == 0) &&
3004 (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
3005
3006 dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
3007
3008 /* fix up mode if we're not using dynperm */
3009 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
3010 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
3011 } else if ((mode & S_IWUGO) &&
3012 (cifsInode->cifsAttrs & ATTR_READONLY)) {
3013
3014 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
3015 /* Attributes of 0 are ignored */
3016 if (dosattr == 0)
3017 dosattr |= ATTR_NORMAL;
3018
3019 /* reset local inode permissions to normal */
3020 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
3021 attrs->ia_mode &= ~(S_IALLUGO);
3022 if (S_ISDIR(inode->i_mode))
3023 attrs->ia_mode |=
3024 cifs_sb->ctx->dir_mode;
3025 else
3026 attrs->ia_mode |=
3027 cifs_sb->ctx->file_mode;
3028 }
3029 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
3030 /* ignore mode change - ATTR_READONLY hasn't changed */
3031 attrs->ia_valid &= ~ATTR_MODE;
3032 }
3033 }
3034
3035 if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
3036 ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
3037 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
3038 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
3039
3040 /* Even if error on time set, no sense failing the call if
3041 the server would set the time to a reasonable value anyway,
3042 and this check ensures that we are not being called from
3043 sys_utimes in which case we ought to fail the call back to
3044 the user when the server rejects the call */
3045 if ((rc) && (attrs->ia_valid &
3046 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
3047 rc = 0;
3048 }
3049
3050 /* do not need local check to inode_check_ok since the server does
3051 that */
3052 if (rc)
3053 goto cifs_setattr_exit;
3054
3055 if ((attrs->ia_valid & ATTR_SIZE) &&
3056 attrs->ia_size != i_size_read(inode)) {
3057 truncate_setsize(inode, attrs->ia_size);
3058 fscache_resize_cookie(cifs_inode_cookie(inode), attrs->ia_size);
3059 }
3060
3061 setattr_copy(&init_user_ns, inode, attrs);
3062 mark_inode_dirty(inode);
3063
3064cifs_setattr_exit:
3065 free_xid(xid);
3066 free_dentry_path(page);
3067 return rc;
3068}
3069
3070int
3071cifs_setattr(struct user_namespace *mnt_userns, struct dentry *direntry,
3072 struct iattr *attrs)
3073{
3074 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
3075 int rc, retries = 0;
3076#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3077 struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
3078#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3079
3080 if (unlikely(cifs_forced_shutdown(cifs_sb)))
3081 return -EIO;
3082
3083 do {
3084#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3085 if (pTcon->unix_ext)
3086 rc = cifs_setattr_unix(direntry, attrs);
3087 else
3088#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3089 rc = cifs_setattr_nounix(direntry, attrs);
3090 retries++;
3091 } while (is_retryable_error(rc) && retries < 2);
3092
3093 /* BB: add cifs_setattr_legacy for really old servers */
3094 return rc;
3095}
1/*
2 * fs/cifs/inode.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2010
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21#include <linux/fs.h>
22#include <linux/stat.h>
23#include <linux/slab.h>
24#include <linux/pagemap.h>
25#include <linux/freezer.h>
26#include <linux/sched/signal.h>
27#include <linux/wait_bit.h>
28
29#include <asm/div64.h>
30#include "cifsfs.h"
31#include "cifspdu.h"
32#include "cifsglob.h"
33#include "cifsproto.h"
34#include "cifs_debug.h"
35#include "cifs_fs_sb.h"
36#include "cifs_unicode.h"
37#include "fscache.h"
38
39
40static void cifs_set_ops(struct inode *inode)
41{
42 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
43
44 switch (inode->i_mode & S_IFMT) {
45 case S_IFREG:
46 inode->i_op = &cifs_file_inode_ops;
47 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
48 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
49 inode->i_fop = &cifs_file_direct_nobrl_ops;
50 else
51 inode->i_fop = &cifs_file_direct_ops;
52 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
53 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
54 inode->i_fop = &cifs_file_strict_nobrl_ops;
55 else
56 inode->i_fop = &cifs_file_strict_ops;
57 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
58 inode->i_fop = &cifs_file_nobrl_ops;
59 else { /* not direct, send byte range locks */
60 inode->i_fop = &cifs_file_ops;
61 }
62
63 /* check if server can support readpages */
64 if (cifs_sb_master_tcon(cifs_sb)->ses->server->maxBuf <
65 PAGE_SIZE + MAX_CIFS_HDR_SIZE)
66 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
67 else
68 inode->i_data.a_ops = &cifs_addr_ops;
69 break;
70 case S_IFDIR:
71#ifdef CONFIG_CIFS_DFS_UPCALL
72 if (IS_AUTOMOUNT(inode)) {
73 inode->i_op = &cifs_dfs_referral_inode_operations;
74 } else {
75#else /* NO DFS support, treat as a directory */
76 {
77#endif
78 inode->i_op = &cifs_dir_inode_ops;
79 inode->i_fop = &cifs_dir_ops;
80 }
81 break;
82 case S_IFLNK:
83 inode->i_op = &cifs_symlink_inode_ops;
84 break;
85 default:
86 init_special_inode(inode, inode->i_mode, inode->i_rdev);
87 break;
88 }
89}
90
91/* check inode attributes against fattr. If they don't match, tag the
92 * inode for cache invalidation
93 */
94static void
95cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
96{
97 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
98
99 cifs_dbg(FYI, "%s: revalidating inode %llu\n",
100 __func__, cifs_i->uniqueid);
101
102 if (inode->i_state & I_NEW) {
103 cifs_dbg(FYI, "%s: inode %llu is new\n",
104 __func__, cifs_i->uniqueid);
105 return;
106 }
107
108 /* don't bother with revalidation if we have an oplock */
109 if (CIFS_CACHE_READ(cifs_i)) {
110 cifs_dbg(FYI, "%s: inode %llu is oplocked\n",
111 __func__, cifs_i->uniqueid);
112 return;
113 }
114
115 /* revalidate if mtime or size have changed */
116 if (timespec64_equal(&inode->i_mtime, &fattr->cf_mtime) &&
117 cifs_i->server_eof == fattr->cf_eof) {
118 cifs_dbg(FYI, "%s: inode %llu is unchanged\n",
119 __func__, cifs_i->uniqueid);
120 return;
121 }
122
123 cifs_dbg(FYI, "%s: invalidating inode %llu mapping\n",
124 __func__, cifs_i->uniqueid);
125 set_bit(CIFS_INO_INVALID_MAPPING, &cifs_i->flags);
126}
127
128/*
129 * copy nlink to the inode, unless it wasn't provided. Provide
130 * sane values if we don't have an existing one and none was provided
131 */
132static void
133cifs_nlink_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
134{
135 /*
136 * if we're in a situation where we can't trust what we
137 * got from the server (readdir, some non-unix cases)
138 * fake reasonable values
139 */
140 if (fattr->cf_flags & CIFS_FATTR_UNKNOWN_NLINK) {
141 /* only provide fake values on a new inode */
142 if (inode->i_state & I_NEW) {
143 if (fattr->cf_cifsattrs & ATTR_DIRECTORY)
144 set_nlink(inode, 2);
145 else
146 set_nlink(inode, 1);
147 }
148 return;
149 }
150
151 /* we trust the server, so update it */
152 set_nlink(inode, fattr->cf_nlink);
153}
154
155/* populate an inode with info from a cifs_fattr struct */
156void
157cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
158{
159 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
160 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
161
162 cifs_revalidate_cache(inode, fattr);
163
164 spin_lock(&inode->i_lock);
165 /* we do not want atime to be less than mtime, it broke some apps */
166 if (timespec64_compare(&fattr->cf_atime, &fattr->cf_mtime))
167 inode->i_atime = fattr->cf_mtime;
168 else
169 inode->i_atime = fattr->cf_atime;
170 inode->i_mtime = fattr->cf_mtime;
171 inode->i_ctime = fattr->cf_ctime;
172 inode->i_rdev = fattr->cf_rdev;
173 cifs_nlink_fattr_to_inode(inode, fattr);
174 inode->i_uid = fattr->cf_uid;
175 inode->i_gid = fattr->cf_gid;
176
177 /* if dynperm is set, don't clobber existing mode */
178 if (inode->i_state & I_NEW ||
179 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM))
180 inode->i_mode = fattr->cf_mode;
181
182 cifs_i->cifsAttrs = fattr->cf_cifsattrs;
183
184 if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
185 cifs_i->time = 0;
186 else
187 cifs_i->time = jiffies;
188
189 if (fattr->cf_flags & CIFS_FATTR_DELETE_PENDING)
190 set_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags);
191 else
192 clear_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags);
193
194 cifs_i->server_eof = fattr->cf_eof;
195 /*
196 * Can't safely change the file size here if the client is writing to
197 * it due to potential races.
198 */
199 if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) {
200 i_size_write(inode, fattr->cf_eof);
201
202 /*
203 * i_blocks is not related to (i_size / i_blksize),
204 * but instead 512 byte (2**9) size is required for
205 * calculating num blocks.
206 */
207 inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
208 }
209 spin_unlock(&inode->i_lock);
210
211 if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL)
212 inode->i_flags |= S_AUTOMOUNT;
213 if (inode->i_state & I_NEW)
214 cifs_set_ops(inode);
215}
216
217void
218cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
219{
220 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
221
222 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
223 return;
224
225 fattr->cf_uniqueid = iunique(sb, ROOT_I);
226}
227
228/* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
229void
230cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
231 struct cifs_sb_info *cifs_sb)
232{
233 memset(fattr, 0, sizeof(*fattr));
234 fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
235 fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
236 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
237
238 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
239 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime);
240 fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange);
241 /* old POSIX extensions don't get create time */
242
243 fattr->cf_mode = le64_to_cpu(info->Permissions);
244
245 /*
246 * Since we set the inode type below we need to mask off
247 * to avoid strange results if bits set above.
248 */
249 fattr->cf_mode &= ~S_IFMT;
250 switch (le32_to_cpu(info->Type)) {
251 case UNIX_FILE:
252 fattr->cf_mode |= S_IFREG;
253 fattr->cf_dtype = DT_REG;
254 break;
255 case UNIX_SYMLINK:
256 fattr->cf_mode |= S_IFLNK;
257 fattr->cf_dtype = DT_LNK;
258 break;
259 case UNIX_DIR:
260 fattr->cf_mode |= S_IFDIR;
261 fattr->cf_dtype = DT_DIR;
262 break;
263 case UNIX_CHARDEV:
264 fattr->cf_mode |= S_IFCHR;
265 fattr->cf_dtype = DT_CHR;
266 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
267 le64_to_cpu(info->DevMinor) & MINORMASK);
268 break;
269 case UNIX_BLOCKDEV:
270 fattr->cf_mode |= S_IFBLK;
271 fattr->cf_dtype = DT_BLK;
272 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
273 le64_to_cpu(info->DevMinor) & MINORMASK);
274 break;
275 case UNIX_FIFO:
276 fattr->cf_mode |= S_IFIFO;
277 fattr->cf_dtype = DT_FIFO;
278 break;
279 case UNIX_SOCKET:
280 fattr->cf_mode |= S_IFSOCK;
281 fattr->cf_dtype = DT_SOCK;
282 break;
283 default:
284 /* safest to call it a file if we do not know */
285 fattr->cf_mode |= S_IFREG;
286 fattr->cf_dtype = DT_REG;
287 cifs_dbg(FYI, "unknown type %d\n", le32_to_cpu(info->Type));
288 break;
289 }
290
291 fattr->cf_uid = cifs_sb->mnt_uid;
292 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)) {
293 u64 id = le64_to_cpu(info->Uid);
294 if (id < ((uid_t)-1)) {
295 kuid_t uid = make_kuid(&init_user_ns, id);
296 if (uid_valid(uid))
297 fattr->cf_uid = uid;
298 }
299 }
300
301 fattr->cf_gid = cifs_sb->mnt_gid;
302 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)) {
303 u64 id = le64_to_cpu(info->Gid);
304 if (id < ((gid_t)-1)) {
305 kgid_t gid = make_kgid(&init_user_ns, id);
306 if (gid_valid(gid))
307 fattr->cf_gid = gid;
308 }
309 }
310
311 fattr->cf_nlink = le64_to_cpu(info->Nlinks);
312}
313
314/*
315 * Fill a cifs_fattr struct with fake inode info.
316 *
317 * Needed to setup cifs_fattr data for the directory which is the
318 * junction to the new submount (ie to setup the fake directory
319 * which represents a DFS referral).
320 */
321static void
322cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
323{
324 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
325
326 cifs_dbg(FYI, "creating fake fattr for DFS referral\n");
327
328 memset(fattr, 0, sizeof(*fattr));
329 fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
330 fattr->cf_uid = cifs_sb->mnt_uid;
331 fattr->cf_gid = cifs_sb->mnt_gid;
332 ktime_get_real_ts64(&fattr->cf_mtime);
333 fattr->cf_mtime = timespec64_trunc(fattr->cf_mtime, sb->s_time_gran);
334 fattr->cf_atime = fattr->cf_ctime = fattr->cf_mtime;
335 fattr->cf_nlink = 2;
336 fattr->cf_flags = CIFS_FATTR_DFS_REFERRAL;
337}
338
339static int
340cifs_get_file_info_unix(struct file *filp)
341{
342 int rc;
343 unsigned int xid;
344 FILE_UNIX_BASIC_INFO find_data;
345 struct cifs_fattr fattr;
346 struct inode *inode = file_inode(filp);
347 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
348 struct cifsFileInfo *cfile = filp->private_data;
349 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
350
351 xid = get_xid();
352 rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->fid.netfid, &find_data);
353 if (!rc) {
354 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
355 } else if (rc == -EREMOTE) {
356 cifs_create_dfs_fattr(&fattr, inode->i_sb);
357 rc = 0;
358 }
359
360 cifs_fattr_to_inode(inode, &fattr);
361 free_xid(xid);
362 return rc;
363}
364
365int cifs_get_inode_info_unix(struct inode **pinode,
366 const unsigned char *full_path,
367 struct super_block *sb, unsigned int xid)
368{
369 int rc;
370 FILE_UNIX_BASIC_INFO find_data;
371 struct cifs_fattr fattr;
372 struct cifs_tcon *tcon;
373 struct tcon_link *tlink;
374 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
375
376 cifs_dbg(FYI, "Getting info on %s\n", full_path);
377
378 tlink = cifs_sb_tlink(cifs_sb);
379 if (IS_ERR(tlink))
380 return PTR_ERR(tlink);
381 tcon = tlink_tcon(tlink);
382
383 /* could have done a find first instead but this returns more info */
384 rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
385 cifs_sb->local_nls, cifs_remap(cifs_sb));
386 cifs_put_tlink(tlink);
387
388 if (!rc) {
389 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
390 } else if (rc == -EREMOTE) {
391 cifs_create_dfs_fattr(&fattr, sb);
392 rc = 0;
393 } else {
394 return rc;
395 }
396
397 /* check for Minshall+French symlinks */
398 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
399 int tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
400 full_path);
401 if (tmprc)
402 cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
403 }
404
405 if (*pinode == NULL) {
406 /* get new inode */
407 cifs_fill_uniqueid(sb, &fattr);
408 *pinode = cifs_iget(sb, &fattr);
409 if (!*pinode)
410 rc = -ENOMEM;
411 } else {
412 /* we already have inode, update it */
413
414 /* if uniqueid is different, return error */
415 if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
416 CIFS_I(*pinode)->uniqueid != fattr.cf_uniqueid)) {
417 CIFS_I(*pinode)->time = 0; /* force reval */
418 rc = -ESTALE;
419 goto cgiiu_exit;
420 }
421
422 /* if filetype is different, return error */
423 if (unlikely(((*pinode)->i_mode & S_IFMT) !=
424 (fattr.cf_mode & S_IFMT))) {
425 CIFS_I(*pinode)->time = 0; /* force reval */
426 rc = -ESTALE;
427 goto cgiiu_exit;
428 }
429
430 cifs_fattr_to_inode(*pinode, &fattr);
431 }
432
433cgiiu_exit:
434 return rc;
435}
436
437static int
438cifs_sfu_type(struct cifs_fattr *fattr, const char *path,
439 struct cifs_sb_info *cifs_sb, unsigned int xid)
440{
441 int rc;
442 __u32 oplock;
443 struct tcon_link *tlink;
444 struct cifs_tcon *tcon;
445 struct cifs_fid fid;
446 struct cifs_open_parms oparms;
447 struct cifs_io_parms io_parms;
448 char buf[24];
449 unsigned int bytes_read;
450 char *pbuf;
451 int buf_type = CIFS_NO_BUFFER;
452
453 pbuf = buf;
454
455 fattr->cf_mode &= ~S_IFMT;
456
457 if (fattr->cf_eof == 0) {
458 fattr->cf_mode |= S_IFIFO;
459 fattr->cf_dtype = DT_FIFO;
460 return 0;
461 } else if (fattr->cf_eof < 8) {
462 fattr->cf_mode |= S_IFREG;
463 fattr->cf_dtype = DT_REG;
464 return -EINVAL; /* EOPNOTSUPP? */
465 }
466
467 tlink = cifs_sb_tlink(cifs_sb);
468 if (IS_ERR(tlink))
469 return PTR_ERR(tlink);
470 tcon = tlink_tcon(tlink);
471
472 oparms.tcon = tcon;
473 oparms.cifs_sb = cifs_sb;
474 oparms.desired_access = GENERIC_READ;
475 oparms.create_options = CREATE_NOT_DIR;
476 if (backup_cred(cifs_sb))
477 oparms.create_options |= CREATE_OPEN_BACKUP_INTENT;
478 oparms.disposition = FILE_OPEN;
479 oparms.path = path;
480 oparms.fid = &fid;
481 oparms.reconnect = false;
482
483 if (tcon->ses->server->oplocks)
484 oplock = REQ_OPLOCK;
485 else
486 oplock = 0;
487 rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, NULL);
488 if (rc) {
489 cifs_dbg(FYI, "check sfu type of %s, open rc = %d\n", path, rc);
490 cifs_put_tlink(tlink);
491 return rc;
492 }
493
494 /* Read header */
495 io_parms.netfid = fid.netfid;
496 io_parms.pid = current->tgid;
497 io_parms.tcon = tcon;
498 io_parms.offset = 0;
499 io_parms.length = 24;
500
501 rc = tcon->ses->server->ops->sync_read(xid, &fid, &io_parms,
502 &bytes_read, &pbuf, &buf_type);
503 if ((rc == 0) && (bytes_read >= 8)) {
504 if (memcmp("IntxBLK", pbuf, 8) == 0) {
505 cifs_dbg(FYI, "Block device\n");
506 fattr->cf_mode |= S_IFBLK;
507 fattr->cf_dtype = DT_BLK;
508 if (bytes_read == 24) {
509 /* we have enough to decode dev num */
510 __u64 mjr; /* major */
511 __u64 mnr; /* minor */
512 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
513 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
514 fattr->cf_rdev = MKDEV(mjr, mnr);
515 }
516 } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
517 cifs_dbg(FYI, "Char device\n");
518 fattr->cf_mode |= S_IFCHR;
519 fattr->cf_dtype = DT_CHR;
520 if (bytes_read == 24) {
521 /* we have enough to decode dev num */
522 __u64 mjr; /* major */
523 __u64 mnr; /* minor */
524 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
525 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
526 fattr->cf_rdev = MKDEV(mjr, mnr);
527 }
528 } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
529 cifs_dbg(FYI, "Symlink\n");
530 fattr->cf_mode |= S_IFLNK;
531 fattr->cf_dtype = DT_LNK;
532 } else {
533 fattr->cf_mode |= S_IFREG; /* file? */
534 fattr->cf_dtype = DT_REG;
535 rc = -EOPNOTSUPP;
536 }
537 } else {
538 fattr->cf_mode |= S_IFREG; /* then it is a file */
539 fattr->cf_dtype = DT_REG;
540 rc = -EOPNOTSUPP; /* or some unknown SFU type */
541 }
542
543 tcon->ses->server->ops->close(xid, tcon, &fid);
544 cifs_put_tlink(tlink);
545 return rc;
546}
547
548#define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */
549
550/*
551 * Fetch mode bits as provided by SFU.
552 *
553 * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ?
554 */
555static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
556 struct cifs_sb_info *cifs_sb, unsigned int xid)
557{
558#ifdef CONFIG_CIFS_XATTR
559 ssize_t rc;
560 char ea_value[4];
561 __u32 mode;
562 struct tcon_link *tlink;
563 struct cifs_tcon *tcon;
564
565 tlink = cifs_sb_tlink(cifs_sb);
566 if (IS_ERR(tlink))
567 return PTR_ERR(tlink);
568 tcon = tlink_tcon(tlink);
569
570 if (tcon->ses->server->ops->query_all_EAs == NULL) {
571 cifs_put_tlink(tlink);
572 return -EOPNOTSUPP;
573 }
574
575 rc = tcon->ses->server->ops->query_all_EAs(xid, tcon, path,
576 "SETFILEBITS", ea_value, 4 /* size of buf */,
577 cifs_sb);
578 cifs_put_tlink(tlink);
579 if (rc < 0)
580 return (int)rc;
581 else if (rc > 3) {
582 mode = le32_to_cpu(*((__le32 *)ea_value));
583 fattr->cf_mode &= ~SFBITS_MASK;
584 cifs_dbg(FYI, "special bits 0%o org mode 0%o\n",
585 mode, fattr->cf_mode);
586 fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode;
587 cifs_dbg(FYI, "special mode bits 0%o\n", mode);
588 }
589
590 return 0;
591#else
592 return -EOPNOTSUPP;
593#endif
594}
595
596/* Fill a cifs_fattr struct with info from FILE_ALL_INFO */
597static void
598cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
599 struct super_block *sb, bool adjust_tz,
600 bool symlink)
601{
602 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
603 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
604
605 memset(fattr, 0, sizeof(*fattr));
606 fattr->cf_cifsattrs = le32_to_cpu(info->Attributes);
607 if (info->DeletePending)
608 fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING;
609
610 if (info->LastAccessTime)
611 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
612 else {
613 ktime_get_real_ts64(&fattr->cf_atime);
614 fattr->cf_atime = timespec64_trunc(fattr->cf_atime, sb->s_time_gran);
615 }
616
617 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
618 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
619
620 if (adjust_tz) {
621 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
622 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
623 }
624
625 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
626 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
627 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
628
629 fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
630
631 if (symlink) {
632 fattr->cf_mode = S_IFLNK;
633 fattr->cf_dtype = DT_LNK;
634 } else if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
635 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
636 fattr->cf_dtype = DT_DIR;
637 /*
638 * Server can return wrong NumberOfLinks value for directories
639 * when Unix extensions are disabled - fake it.
640 */
641 if (!tcon->unix_ext)
642 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
643 } else {
644 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
645 fattr->cf_dtype = DT_REG;
646
647 /* clear write bits if ATTR_READONLY is set */
648 if (fattr->cf_cifsattrs & ATTR_READONLY)
649 fattr->cf_mode &= ~(S_IWUGO);
650
651 /*
652 * Don't accept zero nlink from non-unix servers unless
653 * delete is pending. Instead mark it as unknown.
654 */
655 if ((fattr->cf_nlink < 1) && !tcon->unix_ext &&
656 !info->DeletePending) {
657 cifs_dbg(1, "bogus file nlink value %u\n",
658 fattr->cf_nlink);
659 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
660 }
661 }
662
663 fattr->cf_uid = cifs_sb->mnt_uid;
664 fattr->cf_gid = cifs_sb->mnt_gid;
665}
666
667static int
668cifs_get_file_info(struct file *filp)
669{
670 int rc;
671 unsigned int xid;
672 FILE_ALL_INFO find_data;
673 struct cifs_fattr fattr;
674 struct inode *inode = file_inode(filp);
675 struct cifsFileInfo *cfile = filp->private_data;
676 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
677 struct TCP_Server_Info *server = tcon->ses->server;
678
679 if (!server->ops->query_file_info)
680 return -ENOSYS;
681
682 xid = get_xid();
683 rc = server->ops->query_file_info(xid, tcon, &cfile->fid, &find_data);
684 switch (rc) {
685 case 0:
686 cifs_all_info_to_fattr(&fattr, &find_data, inode->i_sb, false,
687 false);
688 break;
689 case -EREMOTE:
690 cifs_create_dfs_fattr(&fattr, inode->i_sb);
691 rc = 0;
692 break;
693 case -EOPNOTSUPP:
694 case -EINVAL:
695 /*
696 * FIXME: legacy server -- fall back to path-based call?
697 * for now, just skip revalidating and mark inode for
698 * immediate reval.
699 */
700 rc = 0;
701 CIFS_I(inode)->time = 0;
702 default:
703 goto cgfi_exit;
704 }
705
706 /*
707 * don't bother with SFU junk here -- just mark inode as needing
708 * revalidation.
709 */
710 fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
711 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
712 cifs_fattr_to_inode(inode, &fattr);
713cgfi_exit:
714 free_xid(xid);
715 return rc;
716}
717
718/* Simple function to return a 64 bit hash of string. Rarely called */
719static __u64 simple_hashstr(const char *str)
720{
721 const __u64 hash_mult = 1125899906842597ULL; /* a big enough prime */
722 __u64 hash = 0;
723
724 while (*str)
725 hash = (hash + (__u64) *str++) * hash_mult;
726
727 return hash;
728}
729
730int
731cifs_get_inode_info(struct inode **inode, const char *full_path,
732 FILE_ALL_INFO *data, struct super_block *sb, int xid,
733 const struct cifs_fid *fid)
734{
735 __u16 srchflgs;
736 int rc = 0, tmprc = ENOSYS;
737 struct cifs_tcon *tcon;
738 struct TCP_Server_Info *server;
739 struct tcon_link *tlink;
740 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
741 char *buf = NULL;
742 bool adjust_tz = false;
743 struct cifs_fattr fattr;
744 struct cifs_search_info *srchinf = NULL;
745 bool symlink = false;
746
747 tlink = cifs_sb_tlink(cifs_sb);
748 if (IS_ERR(tlink))
749 return PTR_ERR(tlink);
750 tcon = tlink_tcon(tlink);
751 server = tcon->ses->server;
752
753 cifs_dbg(FYI, "Getting info on %s\n", full_path);
754
755 if ((data == NULL) && (*inode != NULL)) {
756 if (CIFS_CACHE_READ(CIFS_I(*inode)) &&
757 CIFS_I(*inode)->time != 0) {
758 cifs_dbg(FYI, "No need to revalidate cached inode sizes\n");
759 goto cgii_exit;
760 }
761 }
762
763 /* if inode info is not passed, get it from server */
764 if (data == NULL) {
765 if (!server->ops->query_path_info) {
766 rc = -ENOSYS;
767 goto cgii_exit;
768 }
769 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
770 if (buf == NULL) {
771 rc = -ENOMEM;
772 goto cgii_exit;
773 }
774 data = (FILE_ALL_INFO *)buf;
775 rc = server->ops->query_path_info(xid, tcon, cifs_sb, full_path,
776 data, &adjust_tz, &symlink);
777 }
778
779 if (!rc) {
780 cifs_all_info_to_fattr(&fattr, data, sb, adjust_tz,
781 symlink);
782 } else if (rc == -EREMOTE) {
783 cifs_create_dfs_fattr(&fattr, sb);
784 rc = 0;
785 } else if ((rc == -EACCES) && backup_cred(cifs_sb) &&
786 (strcmp(server->vals->version_string, SMB1_VERSION_STRING)
787 == 0)) {
788 /*
789 * For SMB2 and later the backup intent flag is already
790 * sent if needed on open and there is no path based
791 * FindFirst operation to use to retry with
792 */
793
794 srchinf = kzalloc(sizeof(struct cifs_search_info),
795 GFP_KERNEL);
796 if (srchinf == NULL) {
797 rc = -ENOMEM;
798 goto cgii_exit;
799 }
800
801 srchinf->endOfSearch = false;
802 if (tcon->unix_ext)
803 srchinf->info_level = SMB_FIND_FILE_UNIX;
804 else if ((tcon->ses->capabilities &
805 tcon->ses->server->vals->cap_nt_find) == 0)
806 srchinf->info_level = SMB_FIND_FILE_INFO_STANDARD;
807 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
808 srchinf->info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
809 else /* no srvino useful for fallback to some netapp */
810 srchinf->info_level = SMB_FIND_FILE_DIRECTORY_INFO;
811
812 srchflgs = CIFS_SEARCH_CLOSE_ALWAYS |
813 CIFS_SEARCH_CLOSE_AT_END |
814 CIFS_SEARCH_BACKUP_SEARCH;
815
816 rc = CIFSFindFirst(xid, tcon, full_path,
817 cifs_sb, NULL, srchflgs, srchinf, false);
818 if (!rc) {
819 data = (FILE_ALL_INFO *)srchinf->srch_entries_start;
820
821 cifs_dir_info_to_fattr(&fattr,
822 (FILE_DIRECTORY_INFO *)data, cifs_sb);
823 fattr.cf_uniqueid = le64_to_cpu(
824 ((SEARCH_ID_FULL_DIR_INFO *)data)->UniqueId);
825
826 cifs_buf_release(srchinf->ntwrk_buf_start);
827 }
828 kfree(srchinf);
829 if (rc)
830 goto cgii_exit;
831 } else
832 goto cgii_exit;
833
834 /*
835 * If an inode wasn't passed in, then get the inode number
836 *
837 * Is an i_ino of zero legal? Can we use that to check if the server
838 * supports returning inode numbers? Are there other sanity checks we
839 * can use to ensure that the server is really filling in that field?
840 */
841 if (*inode == NULL) {
842 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
843 if (server->ops->get_srv_inum)
844 tmprc = server->ops->get_srv_inum(xid,
845 tcon, cifs_sb, full_path,
846 &fattr.cf_uniqueid, data);
847 if (tmprc) {
848 cifs_dbg(FYI, "GetSrvInodeNum rc %d\n",
849 tmprc);
850 fattr.cf_uniqueid = iunique(sb, ROOT_I);
851 cifs_autodisable_serverino(cifs_sb);
852 } else if ((fattr.cf_uniqueid == 0) &&
853 strlen(full_path) == 0) {
854 /* some servers ret bad root ino ie 0 */
855 cifs_dbg(FYI, "Invalid (0) inodenum\n");
856 fattr.cf_flags |=
857 CIFS_FATTR_FAKE_ROOT_INO;
858 fattr.cf_uniqueid =
859 simple_hashstr(tcon->treeName);
860 }
861 } else
862 fattr.cf_uniqueid = iunique(sb, ROOT_I);
863 } else {
864 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
865 && server->ops->get_srv_inum) {
866 /*
867 * Pass a NULL tcon to ensure we don't make a round
868 * trip to the server. This only works for SMB2+.
869 */
870 tmprc = server->ops->get_srv_inum(xid,
871 NULL, cifs_sb, full_path,
872 &fattr.cf_uniqueid, data);
873 if (tmprc)
874 fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
875 else if ((fattr.cf_uniqueid == 0) &&
876 strlen(full_path) == 0) {
877 /*
878 * Reuse existing root inode num since
879 * inum zero for root causes ls of . and .. to
880 * not be returned
881 */
882 cifs_dbg(FYI, "Srv ret 0 inode num for root\n");
883 fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
884 }
885 } else
886 fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
887 }
888
889 /* query for SFU type info if supported and needed */
890 if (fattr.cf_cifsattrs & ATTR_SYSTEM &&
891 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
892 tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid);
893 if (tmprc)
894 cifs_dbg(FYI, "cifs_sfu_type failed: %d\n", tmprc);
895 }
896
897 /* fill in 0777 bits from ACL */
898 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) {
899 rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, true,
900 full_path, fid);
901 if (rc) {
902 cifs_dbg(FYI, "%s: Get mode from SID failed. rc=%d\n",
903 __func__, rc);
904 goto cgii_exit;
905 }
906 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
907 rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, false,
908 full_path, fid);
909 if (rc) {
910 cifs_dbg(FYI, "%s: Getting ACL failed with error: %d\n",
911 __func__, rc);
912 goto cgii_exit;
913 }
914 }
915
916 /* fill in remaining high mode bits e.g. SUID, VTX */
917 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
918 cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
919
920 /* check for Minshall+French symlinks */
921 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
922 tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
923 full_path);
924 if (tmprc)
925 cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
926 }
927
928 if (!*inode) {
929 *inode = cifs_iget(sb, &fattr);
930 if (!*inode)
931 rc = -ENOMEM;
932 } else {
933 /* we already have inode, update it */
934
935 /* if uniqueid is different, return error */
936 if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
937 CIFS_I(*inode)->uniqueid != fattr.cf_uniqueid)) {
938 CIFS_I(*inode)->time = 0; /* force reval */
939 rc = -ESTALE;
940 goto cgii_exit;
941 }
942
943 /* if filetype is different, return error */
944 if (unlikely(((*inode)->i_mode & S_IFMT) !=
945 (fattr.cf_mode & S_IFMT))) {
946 CIFS_I(*inode)->time = 0; /* force reval */
947 rc = -ESTALE;
948 goto cgii_exit;
949 }
950
951 cifs_fattr_to_inode(*inode, &fattr);
952 }
953
954cgii_exit:
955 if ((*inode) && ((*inode)->i_ino == 0))
956 cifs_dbg(FYI, "inode number of zero returned\n");
957
958 kfree(buf);
959 cifs_put_tlink(tlink);
960 return rc;
961}
962
963static const struct inode_operations cifs_ipc_inode_ops = {
964 .lookup = cifs_lookup,
965};
966
967static int
968cifs_find_inode(struct inode *inode, void *opaque)
969{
970 struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
971
972 /* don't match inode with different uniqueid */
973 if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
974 return 0;
975
976 /* use createtime like an i_generation field */
977 if (CIFS_I(inode)->createtime != fattr->cf_createtime)
978 return 0;
979
980 /* don't match inode of different type */
981 if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT))
982 return 0;
983
984 /* if it's not a directory or has no dentries, then flag it */
985 if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry))
986 fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
987
988 return 1;
989}
990
991static int
992cifs_init_inode(struct inode *inode, void *opaque)
993{
994 struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
995
996 CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
997 CIFS_I(inode)->createtime = fattr->cf_createtime;
998 return 0;
999}
1000
1001/*
1002 * walk dentry list for an inode and report whether it has aliases that
1003 * are hashed. We use this to determine if a directory inode can actually
1004 * be used.
1005 */
1006static bool
1007inode_has_hashed_dentries(struct inode *inode)
1008{
1009 struct dentry *dentry;
1010
1011 spin_lock(&inode->i_lock);
1012 hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) {
1013 if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
1014 spin_unlock(&inode->i_lock);
1015 return true;
1016 }
1017 }
1018 spin_unlock(&inode->i_lock);
1019 return false;
1020}
1021
1022/* Given fattrs, get a corresponding inode */
1023struct inode *
1024cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
1025{
1026 unsigned long hash;
1027 struct inode *inode;
1028
1029retry_iget5_locked:
1030 cifs_dbg(FYI, "looking for uniqueid=%llu\n", fattr->cf_uniqueid);
1031
1032 /* hash down to 32-bits on 32-bit arch */
1033 hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
1034
1035 inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
1036 if (inode) {
1037 /* was there a potentially problematic inode collision? */
1038 if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
1039 fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
1040
1041 if (inode_has_hashed_dentries(inode)) {
1042 cifs_autodisable_serverino(CIFS_SB(sb));
1043 iput(inode);
1044 fattr->cf_uniqueid = iunique(sb, ROOT_I);
1045 goto retry_iget5_locked;
1046 }
1047 }
1048
1049 cifs_fattr_to_inode(inode, fattr);
1050 if (sb->s_flags & SB_NOATIME)
1051 inode->i_flags |= S_NOATIME | S_NOCMTIME;
1052 if (inode->i_state & I_NEW) {
1053 inode->i_ino = hash;
1054#ifdef CONFIG_CIFS_FSCACHE
1055 /* initialize per-inode cache cookie pointer */
1056 CIFS_I(inode)->fscache = NULL;
1057#endif
1058 unlock_new_inode(inode);
1059 }
1060 }
1061
1062 return inode;
1063}
1064
1065/* gets root inode */
1066struct inode *cifs_root_iget(struct super_block *sb)
1067{
1068 unsigned int xid;
1069 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1070 struct inode *inode = NULL;
1071 long rc;
1072 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
1073 char *path = NULL;
1074 int len;
1075
1076 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
1077 && cifs_sb->prepath) {
1078 len = strlen(cifs_sb->prepath);
1079 path = kzalloc(len + 2 /* leading sep + null */, GFP_KERNEL);
1080 if (path == NULL)
1081 return ERR_PTR(-ENOMEM);
1082 path[0] = '/';
1083 memcpy(path+1, cifs_sb->prepath, len);
1084 } else {
1085 path = kstrdup("", GFP_KERNEL);
1086 if (path == NULL)
1087 return ERR_PTR(-ENOMEM);
1088 }
1089
1090 xid = get_xid();
1091 if (tcon->unix_ext) {
1092 rc = cifs_get_inode_info_unix(&inode, path, sb, xid);
1093 /* some servers mistakenly claim POSIX support */
1094 if (rc != -EOPNOTSUPP)
1095 goto iget_no_retry;
1096 cifs_dbg(VFS, "server does not support POSIX extensions");
1097 tcon->unix_ext = false;
1098 }
1099
1100 convert_delimiter(path, CIFS_DIR_SEP(cifs_sb));
1101 rc = cifs_get_inode_info(&inode, path, NULL, sb, xid, NULL);
1102
1103iget_no_retry:
1104 if (!inode) {
1105 inode = ERR_PTR(rc);
1106 goto out;
1107 }
1108
1109#ifdef CONFIG_CIFS_FSCACHE
1110 /* populate tcon->resource_id */
1111 tcon->resource_id = CIFS_I(inode)->uniqueid;
1112#endif
1113
1114 if (rc && tcon->pipe) {
1115 cifs_dbg(FYI, "ipc connection - fake read inode\n");
1116 spin_lock(&inode->i_lock);
1117 inode->i_mode |= S_IFDIR;
1118 set_nlink(inode, 2);
1119 inode->i_op = &cifs_ipc_inode_ops;
1120 inode->i_fop = &simple_dir_operations;
1121 inode->i_uid = cifs_sb->mnt_uid;
1122 inode->i_gid = cifs_sb->mnt_gid;
1123 spin_unlock(&inode->i_lock);
1124 } else if (rc) {
1125 iget_failed(inode);
1126 inode = ERR_PTR(rc);
1127 }
1128
1129out:
1130 kfree(path);
1131 free_xid(xid);
1132 return inode;
1133}
1134
1135int
1136cifs_set_file_info(struct inode *inode, struct iattr *attrs, unsigned int xid,
1137 char *full_path, __u32 dosattr)
1138{
1139 bool set_time = false;
1140 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1141 struct TCP_Server_Info *server;
1142 FILE_BASIC_INFO info_buf;
1143
1144 if (attrs == NULL)
1145 return -EINVAL;
1146
1147 server = cifs_sb_master_tcon(cifs_sb)->ses->server;
1148 if (!server->ops->set_file_info)
1149 return -ENOSYS;
1150
1151 info_buf.Pad = 0;
1152
1153 if (attrs->ia_valid & ATTR_ATIME) {
1154 set_time = true;
1155 info_buf.LastAccessTime =
1156 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1157 } else
1158 info_buf.LastAccessTime = 0;
1159
1160 if (attrs->ia_valid & ATTR_MTIME) {
1161 set_time = true;
1162 info_buf.LastWriteTime =
1163 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1164 } else
1165 info_buf.LastWriteTime = 0;
1166
1167 /*
1168 * Samba throws this field away, but windows may actually use it.
1169 * Do not set ctime unless other time stamps are changed explicitly
1170 * (i.e. by utimes()) since we would then have a mix of client and
1171 * server times.
1172 */
1173 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1174 cifs_dbg(FYI, "CIFS - CTIME changed\n");
1175 info_buf.ChangeTime =
1176 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1177 } else
1178 info_buf.ChangeTime = 0;
1179
1180 info_buf.CreationTime = 0; /* don't change */
1181 info_buf.Attributes = cpu_to_le32(dosattr);
1182
1183 return server->ops->set_file_info(inode, full_path, &info_buf, xid);
1184}
1185
1186/*
1187 * Open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
1188 * and rename it to a random name that hopefully won't conflict with
1189 * anything else.
1190 */
1191int
1192cifs_rename_pending_delete(const char *full_path, struct dentry *dentry,
1193 const unsigned int xid)
1194{
1195 int oplock = 0;
1196 int rc;
1197 struct cifs_fid fid;
1198 struct cifs_open_parms oparms;
1199 struct inode *inode = d_inode(dentry);
1200 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1201 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1202 struct tcon_link *tlink;
1203 struct cifs_tcon *tcon;
1204 __u32 dosattr, origattr;
1205 FILE_BASIC_INFO *info_buf = NULL;
1206
1207 tlink = cifs_sb_tlink(cifs_sb);
1208 if (IS_ERR(tlink))
1209 return PTR_ERR(tlink);
1210 tcon = tlink_tcon(tlink);
1211
1212 /*
1213 * We cannot rename the file if the server doesn't support
1214 * CAP_INFOLEVEL_PASSTHRU
1215 */
1216 if (!(tcon->ses->capabilities & CAP_INFOLEVEL_PASSTHRU)) {
1217 rc = -EBUSY;
1218 goto out;
1219 }
1220
1221 oparms.tcon = tcon;
1222 oparms.cifs_sb = cifs_sb;
1223 oparms.desired_access = DELETE | FILE_WRITE_ATTRIBUTES;
1224 oparms.create_options = CREATE_NOT_DIR;
1225 oparms.disposition = FILE_OPEN;
1226 oparms.path = full_path;
1227 oparms.fid = &fid;
1228 oparms.reconnect = false;
1229
1230 rc = CIFS_open(xid, &oparms, &oplock, NULL);
1231 if (rc != 0)
1232 goto out;
1233
1234 origattr = cifsInode->cifsAttrs;
1235 if (origattr == 0)
1236 origattr |= ATTR_NORMAL;
1237
1238 dosattr = origattr & ~ATTR_READONLY;
1239 if (dosattr == 0)
1240 dosattr |= ATTR_NORMAL;
1241 dosattr |= ATTR_HIDDEN;
1242
1243 /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
1244 if (dosattr != origattr) {
1245 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
1246 if (info_buf == NULL) {
1247 rc = -ENOMEM;
1248 goto out_close;
1249 }
1250 info_buf->Attributes = cpu_to_le32(dosattr);
1251 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid,
1252 current->tgid);
1253 /* although we would like to mark the file hidden
1254 if that fails we will still try to rename it */
1255 if (!rc)
1256 cifsInode->cifsAttrs = dosattr;
1257 else
1258 dosattr = origattr; /* since not able to change them */
1259 }
1260
1261 /* rename the file */
1262 rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, NULL,
1263 cifs_sb->local_nls,
1264 cifs_remap(cifs_sb));
1265 if (rc != 0) {
1266 rc = -EBUSY;
1267 goto undo_setattr;
1268 }
1269
1270 /* try to set DELETE_ON_CLOSE */
1271 if (!test_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags)) {
1272 rc = CIFSSMBSetFileDisposition(xid, tcon, true, fid.netfid,
1273 current->tgid);
1274 /*
1275 * some samba versions return -ENOENT when we try to set the
1276 * file disposition here. Likely a samba bug, but work around
1277 * it for now. This means that some cifsXXX files may hang
1278 * around after they shouldn't.
1279 *
1280 * BB: remove this hack after more servers have the fix
1281 */
1282 if (rc == -ENOENT)
1283 rc = 0;
1284 else if (rc != 0) {
1285 rc = -EBUSY;
1286 goto undo_rename;
1287 }
1288 set_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags);
1289 }
1290
1291out_close:
1292 CIFSSMBClose(xid, tcon, fid.netfid);
1293out:
1294 kfree(info_buf);
1295 cifs_put_tlink(tlink);
1296 return rc;
1297
1298 /*
1299 * reset everything back to the original state. Don't bother
1300 * dealing with errors here since we can't do anything about
1301 * them anyway.
1302 */
1303undo_rename:
1304 CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, dentry->d_name.name,
1305 cifs_sb->local_nls, cifs_remap(cifs_sb));
1306undo_setattr:
1307 if (dosattr != origattr) {
1308 info_buf->Attributes = cpu_to_le32(origattr);
1309 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid,
1310 current->tgid))
1311 cifsInode->cifsAttrs = origattr;
1312 }
1313
1314 goto out_close;
1315}
1316
1317/* copied from fs/nfs/dir.c with small changes */
1318static void
1319cifs_drop_nlink(struct inode *inode)
1320{
1321 spin_lock(&inode->i_lock);
1322 if (inode->i_nlink > 0)
1323 drop_nlink(inode);
1324 spin_unlock(&inode->i_lock);
1325}
1326
1327/*
1328 * If d_inode(dentry) is null (usually meaning the cached dentry
1329 * is a negative dentry) then we would attempt a standard SMB delete, but
1330 * if that fails we can not attempt the fall back mechanisms on EACCES
1331 * but will return the EACCES to the caller. Note that the VFS does not call
1332 * unlink on negative dentries currently.
1333 */
1334int cifs_unlink(struct inode *dir, struct dentry *dentry)
1335{
1336 int rc = 0;
1337 unsigned int xid;
1338 char *full_path = NULL;
1339 struct inode *inode = d_inode(dentry);
1340 struct cifsInodeInfo *cifs_inode;
1341 struct super_block *sb = dir->i_sb;
1342 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1343 struct tcon_link *tlink;
1344 struct cifs_tcon *tcon;
1345 struct TCP_Server_Info *server;
1346 struct iattr *attrs = NULL;
1347 __u32 dosattr = 0, origattr = 0;
1348
1349 cifs_dbg(FYI, "cifs_unlink, dir=0x%p, dentry=0x%p\n", dir, dentry);
1350
1351 tlink = cifs_sb_tlink(cifs_sb);
1352 if (IS_ERR(tlink))
1353 return PTR_ERR(tlink);
1354 tcon = tlink_tcon(tlink);
1355 server = tcon->ses->server;
1356
1357 xid = get_xid();
1358
1359 /* Unlink can be called from rename so we can not take the
1360 * sb->s_vfs_rename_mutex here */
1361 full_path = build_path_from_dentry(dentry);
1362 if (full_path == NULL) {
1363 rc = -ENOMEM;
1364 goto unlink_out;
1365 }
1366
1367 if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1368 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1369 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
1370 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
1371 cifs_remap(cifs_sb));
1372 cifs_dbg(FYI, "posix del rc %d\n", rc);
1373 if ((rc == 0) || (rc == -ENOENT))
1374 goto psx_del_no_retry;
1375 }
1376
1377retry_std_delete:
1378 if (!server->ops->unlink) {
1379 rc = -ENOSYS;
1380 goto psx_del_no_retry;
1381 }
1382
1383 rc = server->ops->unlink(xid, tcon, full_path, cifs_sb);
1384
1385psx_del_no_retry:
1386 if (!rc) {
1387 if (inode)
1388 cifs_drop_nlink(inode);
1389 } else if (rc == -ENOENT) {
1390 d_drop(dentry);
1391 } else if (rc == -EBUSY) {
1392 if (server->ops->rename_pending_delete) {
1393 rc = server->ops->rename_pending_delete(full_path,
1394 dentry, xid);
1395 if (rc == 0)
1396 cifs_drop_nlink(inode);
1397 }
1398 } else if ((rc == -EACCES) && (dosattr == 0) && inode) {
1399 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1400 if (attrs == NULL) {
1401 rc = -ENOMEM;
1402 goto out_reval;
1403 }
1404
1405 /* try to reset dos attributes */
1406 cifs_inode = CIFS_I(inode);
1407 origattr = cifs_inode->cifsAttrs;
1408 if (origattr == 0)
1409 origattr |= ATTR_NORMAL;
1410 dosattr = origattr & ~ATTR_READONLY;
1411 if (dosattr == 0)
1412 dosattr |= ATTR_NORMAL;
1413 dosattr |= ATTR_HIDDEN;
1414
1415 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1416 if (rc != 0)
1417 goto out_reval;
1418
1419 goto retry_std_delete;
1420 }
1421
1422 /* undo the setattr if we errored out and it's needed */
1423 if (rc != 0 && dosattr != 0)
1424 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
1425
1426out_reval:
1427 if (inode) {
1428 cifs_inode = CIFS_I(inode);
1429 cifs_inode->time = 0; /* will force revalidate to get info
1430 when needed */
1431 inode->i_ctime = current_time(inode);
1432 }
1433 dir->i_ctime = dir->i_mtime = current_time(dir);
1434 cifs_inode = CIFS_I(dir);
1435 CIFS_I(dir)->time = 0; /* force revalidate of dir as well */
1436unlink_out:
1437 kfree(full_path);
1438 kfree(attrs);
1439 free_xid(xid);
1440 cifs_put_tlink(tlink);
1441 return rc;
1442}
1443
1444static int
1445cifs_mkdir_qinfo(struct inode *parent, struct dentry *dentry, umode_t mode,
1446 const char *full_path, struct cifs_sb_info *cifs_sb,
1447 struct cifs_tcon *tcon, const unsigned int xid)
1448{
1449 int rc = 0;
1450 struct inode *inode = NULL;
1451
1452 if (tcon->unix_ext)
1453 rc = cifs_get_inode_info_unix(&inode, full_path, parent->i_sb,
1454 xid);
1455 else
1456 rc = cifs_get_inode_info(&inode, full_path, NULL, parent->i_sb,
1457 xid, NULL);
1458
1459 if (rc)
1460 return rc;
1461
1462 /*
1463 * setting nlink not necessary except in cases where we failed to get it
1464 * from the server or was set bogus. Also, since this is a brand new
1465 * inode, no need to grab the i_lock before setting the i_nlink.
1466 */
1467 if (inode->i_nlink < 2)
1468 set_nlink(inode, 2);
1469 mode &= ~current_umask();
1470 /* must turn on setgid bit if parent dir has it */
1471 if (parent->i_mode & S_ISGID)
1472 mode |= S_ISGID;
1473
1474 if (tcon->unix_ext) {
1475 struct cifs_unix_set_info_args args = {
1476 .mode = mode,
1477 .ctime = NO_CHANGE_64,
1478 .atime = NO_CHANGE_64,
1479 .mtime = NO_CHANGE_64,
1480 .device = 0,
1481 };
1482 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1483 args.uid = current_fsuid();
1484 if (parent->i_mode & S_ISGID)
1485 args.gid = parent->i_gid;
1486 else
1487 args.gid = current_fsgid();
1488 } else {
1489 args.uid = INVALID_UID; /* no change */
1490 args.gid = INVALID_GID; /* no change */
1491 }
1492 CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
1493 cifs_sb->local_nls,
1494 cifs_remap(cifs_sb));
1495 } else {
1496 struct TCP_Server_Info *server = tcon->ses->server;
1497 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1498 (mode & S_IWUGO) == 0 && server->ops->mkdir_setinfo)
1499 server->ops->mkdir_setinfo(inode, full_path, cifs_sb,
1500 tcon, xid);
1501 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
1502 inode->i_mode = (mode | S_IFDIR);
1503
1504 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1505 inode->i_uid = current_fsuid();
1506 if (inode->i_mode & S_ISGID)
1507 inode->i_gid = parent->i_gid;
1508 else
1509 inode->i_gid = current_fsgid();
1510 }
1511 }
1512 d_instantiate(dentry, inode);
1513 return rc;
1514}
1515
1516static int
1517cifs_posix_mkdir(struct inode *inode, struct dentry *dentry, umode_t mode,
1518 const char *full_path, struct cifs_sb_info *cifs_sb,
1519 struct cifs_tcon *tcon, const unsigned int xid)
1520{
1521 int rc = 0;
1522 u32 oplock = 0;
1523 FILE_UNIX_BASIC_INFO *info = NULL;
1524 struct inode *newinode = NULL;
1525 struct cifs_fattr fattr;
1526
1527 info = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1528 if (info == NULL) {
1529 rc = -ENOMEM;
1530 goto posix_mkdir_out;
1531 }
1532
1533 mode &= ~current_umask();
1534 rc = CIFSPOSIXCreate(xid, tcon, SMB_O_DIRECTORY | SMB_O_CREAT, mode,
1535 NULL /* netfid */, info, &oplock, full_path,
1536 cifs_sb->local_nls, cifs_remap(cifs_sb));
1537 if (rc == -EOPNOTSUPP)
1538 goto posix_mkdir_out;
1539 else if (rc) {
1540 cifs_dbg(FYI, "posix mkdir returned 0x%x\n", rc);
1541 d_drop(dentry);
1542 goto posix_mkdir_out;
1543 }
1544
1545 if (info->Type == cpu_to_le32(-1))
1546 /* no return info, go query for it */
1547 goto posix_mkdir_get_info;
1548 /*
1549 * BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if
1550 * need to set uid/gid.
1551 */
1552
1553 cifs_unix_basic_to_fattr(&fattr, info, cifs_sb);
1554 cifs_fill_uniqueid(inode->i_sb, &fattr);
1555 newinode = cifs_iget(inode->i_sb, &fattr);
1556 if (!newinode)
1557 goto posix_mkdir_get_info;
1558
1559 d_instantiate(dentry, newinode);
1560
1561#ifdef CONFIG_CIFS_DEBUG2
1562 cifs_dbg(FYI, "instantiated dentry %p %pd to inode %p\n",
1563 dentry, dentry, newinode);
1564
1565 if (newinode->i_nlink != 2)
1566 cifs_dbg(FYI, "unexpected number of links %d\n",
1567 newinode->i_nlink);
1568#endif
1569
1570posix_mkdir_out:
1571 kfree(info);
1572 return rc;
1573posix_mkdir_get_info:
1574 rc = cifs_mkdir_qinfo(inode, dentry, mode, full_path, cifs_sb, tcon,
1575 xid);
1576 goto posix_mkdir_out;
1577}
1578
1579int cifs_mkdir(struct inode *inode, struct dentry *direntry, umode_t mode)
1580{
1581 int rc = 0;
1582 unsigned int xid;
1583 struct cifs_sb_info *cifs_sb;
1584 struct tcon_link *tlink;
1585 struct cifs_tcon *tcon;
1586 struct TCP_Server_Info *server;
1587 char *full_path;
1588
1589 cifs_dbg(FYI, "In cifs_mkdir, mode = 0x%hx inode = 0x%p\n",
1590 mode, inode);
1591
1592 cifs_sb = CIFS_SB(inode->i_sb);
1593 tlink = cifs_sb_tlink(cifs_sb);
1594 if (IS_ERR(tlink))
1595 return PTR_ERR(tlink);
1596 tcon = tlink_tcon(tlink);
1597
1598 xid = get_xid();
1599
1600 full_path = build_path_from_dentry(direntry);
1601 if (full_path == NULL) {
1602 rc = -ENOMEM;
1603 goto mkdir_out;
1604 }
1605
1606 server = tcon->ses->server;
1607
1608 if ((server->ops->posix_mkdir) && (tcon->posix_extensions)) {
1609 rc = server->ops->posix_mkdir(xid, inode, mode, tcon, full_path,
1610 cifs_sb);
1611 d_drop(direntry); /* for time being always refresh inode info */
1612 goto mkdir_out;
1613 }
1614
1615 if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1616 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1617 rc = cifs_posix_mkdir(inode, direntry, mode, full_path, cifs_sb,
1618 tcon, xid);
1619 if (rc != -EOPNOTSUPP)
1620 goto mkdir_out;
1621 }
1622
1623 if (!server->ops->mkdir) {
1624 rc = -ENOSYS;
1625 goto mkdir_out;
1626 }
1627
1628 /* BB add setting the equivalent of mode via CreateX w/ACLs */
1629 rc = server->ops->mkdir(xid, inode, mode, tcon, full_path, cifs_sb);
1630 if (rc) {
1631 cifs_dbg(FYI, "cifs_mkdir returned 0x%x\n", rc);
1632 d_drop(direntry);
1633 goto mkdir_out;
1634 }
1635
1636 /* TODO: skip this for smb2/smb3 */
1637 rc = cifs_mkdir_qinfo(inode, direntry, mode, full_path, cifs_sb, tcon,
1638 xid);
1639mkdir_out:
1640 /*
1641 * Force revalidate to get parent dir info when needed since cached
1642 * attributes are invalid now.
1643 */
1644 CIFS_I(inode)->time = 0;
1645 kfree(full_path);
1646 free_xid(xid);
1647 cifs_put_tlink(tlink);
1648 return rc;
1649}
1650
1651int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1652{
1653 int rc = 0;
1654 unsigned int xid;
1655 struct cifs_sb_info *cifs_sb;
1656 struct tcon_link *tlink;
1657 struct cifs_tcon *tcon;
1658 struct TCP_Server_Info *server;
1659 char *full_path = NULL;
1660 struct cifsInodeInfo *cifsInode;
1661
1662 cifs_dbg(FYI, "cifs_rmdir, inode = 0x%p\n", inode);
1663
1664 xid = get_xid();
1665
1666 full_path = build_path_from_dentry(direntry);
1667 if (full_path == NULL) {
1668 rc = -ENOMEM;
1669 goto rmdir_exit;
1670 }
1671
1672 cifs_sb = CIFS_SB(inode->i_sb);
1673 tlink = cifs_sb_tlink(cifs_sb);
1674 if (IS_ERR(tlink)) {
1675 rc = PTR_ERR(tlink);
1676 goto rmdir_exit;
1677 }
1678 tcon = tlink_tcon(tlink);
1679 server = tcon->ses->server;
1680
1681 if (!server->ops->rmdir) {
1682 rc = -ENOSYS;
1683 cifs_put_tlink(tlink);
1684 goto rmdir_exit;
1685 }
1686
1687 rc = server->ops->rmdir(xid, tcon, full_path, cifs_sb);
1688 cifs_put_tlink(tlink);
1689
1690 if (!rc) {
1691 spin_lock(&d_inode(direntry)->i_lock);
1692 i_size_write(d_inode(direntry), 0);
1693 clear_nlink(d_inode(direntry));
1694 spin_unlock(&d_inode(direntry)->i_lock);
1695 }
1696
1697 cifsInode = CIFS_I(d_inode(direntry));
1698 /* force revalidate to go get info when needed */
1699 cifsInode->time = 0;
1700
1701 cifsInode = CIFS_I(inode);
1702 /*
1703 * Force revalidate to get parent dir info when needed since cached
1704 * attributes are invalid now.
1705 */
1706 cifsInode->time = 0;
1707
1708 d_inode(direntry)->i_ctime = inode->i_ctime = inode->i_mtime =
1709 current_time(inode);
1710
1711rmdir_exit:
1712 kfree(full_path);
1713 free_xid(xid);
1714 return rc;
1715}
1716
1717static int
1718cifs_do_rename(const unsigned int xid, struct dentry *from_dentry,
1719 const char *from_path, struct dentry *to_dentry,
1720 const char *to_path)
1721{
1722 struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1723 struct tcon_link *tlink;
1724 struct cifs_tcon *tcon;
1725 struct TCP_Server_Info *server;
1726 struct cifs_fid fid;
1727 struct cifs_open_parms oparms;
1728 int oplock, rc;
1729
1730 tlink = cifs_sb_tlink(cifs_sb);
1731 if (IS_ERR(tlink))
1732 return PTR_ERR(tlink);
1733 tcon = tlink_tcon(tlink);
1734 server = tcon->ses->server;
1735
1736 if (!server->ops->rename)
1737 return -ENOSYS;
1738
1739 /* try path-based rename first */
1740 rc = server->ops->rename(xid, tcon, from_path, to_path, cifs_sb);
1741
1742 /*
1743 * Don't bother with rename by filehandle unless file is busy and
1744 * source. Note that cross directory moves do not work with
1745 * rename by filehandle to various Windows servers.
1746 */
1747 if (rc == 0 || rc != -EBUSY)
1748 goto do_rename_exit;
1749
1750 /* Don't fall back to using SMB on SMB 2+ mount */
1751 if (server->vals->protocol_id != 0)
1752 goto do_rename_exit;
1753
1754 /* open-file renames don't work across directories */
1755 if (to_dentry->d_parent != from_dentry->d_parent)
1756 goto do_rename_exit;
1757
1758 oparms.tcon = tcon;
1759 oparms.cifs_sb = cifs_sb;
1760 /* open the file to be renamed -- we need DELETE perms */
1761 oparms.desired_access = DELETE;
1762 oparms.create_options = CREATE_NOT_DIR;
1763 oparms.disposition = FILE_OPEN;
1764 oparms.path = from_path;
1765 oparms.fid = &fid;
1766 oparms.reconnect = false;
1767
1768 rc = CIFS_open(xid, &oparms, &oplock, NULL);
1769 if (rc == 0) {
1770 rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid,
1771 (const char *) to_dentry->d_name.name,
1772 cifs_sb->local_nls, cifs_remap(cifs_sb));
1773 CIFSSMBClose(xid, tcon, fid.netfid);
1774 }
1775do_rename_exit:
1776 cifs_put_tlink(tlink);
1777 return rc;
1778}
1779
1780int
1781cifs_rename2(struct inode *source_dir, struct dentry *source_dentry,
1782 struct inode *target_dir, struct dentry *target_dentry,
1783 unsigned int flags)
1784{
1785 char *from_name = NULL;
1786 char *to_name = NULL;
1787 struct cifs_sb_info *cifs_sb;
1788 struct tcon_link *tlink;
1789 struct cifs_tcon *tcon;
1790 FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1791 FILE_UNIX_BASIC_INFO *info_buf_target;
1792 unsigned int xid;
1793 int rc, tmprc;
1794
1795 if (flags & ~RENAME_NOREPLACE)
1796 return -EINVAL;
1797
1798 cifs_sb = CIFS_SB(source_dir->i_sb);
1799 tlink = cifs_sb_tlink(cifs_sb);
1800 if (IS_ERR(tlink))
1801 return PTR_ERR(tlink);
1802 tcon = tlink_tcon(tlink);
1803
1804 xid = get_xid();
1805
1806 /*
1807 * we already have the rename sem so we do not need to
1808 * grab it again here to protect the path integrity
1809 */
1810 from_name = build_path_from_dentry(source_dentry);
1811 if (from_name == NULL) {
1812 rc = -ENOMEM;
1813 goto cifs_rename_exit;
1814 }
1815
1816 to_name = build_path_from_dentry(target_dentry);
1817 if (to_name == NULL) {
1818 rc = -ENOMEM;
1819 goto cifs_rename_exit;
1820 }
1821
1822 rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
1823 to_name);
1824
1825 /*
1826 * No-replace is the natural behavior for CIFS, so skip unlink hacks.
1827 */
1828 if (flags & RENAME_NOREPLACE)
1829 goto cifs_rename_exit;
1830
1831 if (rc == -EEXIST && tcon->unix_ext) {
1832 /*
1833 * Are src and dst hardlinks of same inode? We can only tell
1834 * with unix extensions enabled.
1835 */
1836 info_buf_source =
1837 kmalloc_array(2, sizeof(FILE_UNIX_BASIC_INFO),
1838 GFP_KERNEL);
1839 if (info_buf_source == NULL) {
1840 rc = -ENOMEM;
1841 goto cifs_rename_exit;
1842 }
1843
1844 info_buf_target = info_buf_source + 1;
1845 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, from_name,
1846 info_buf_source,
1847 cifs_sb->local_nls,
1848 cifs_remap(cifs_sb));
1849 if (tmprc != 0)
1850 goto unlink_target;
1851
1852 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, to_name,
1853 info_buf_target,
1854 cifs_sb->local_nls,
1855 cifs_remap(cifs_sb));
1856
1857 if (tmprc == 0 && (info_buf_source->UniqueId ==
1858 info_buf_target->UniqueId)) {
1859 /* same file, POSIX says that this is a noop */
1860 rc = 0;
1861 goto cifs_rename_exit;
1862 }
1863 }
1864 /*
1865 * else ... BB we could add the same check for Windows by
1866 * checking the UniqueId via FILE_INTERNAL_INFO
1867 */
1868
1869unlink_target:
1870 /* Try unlinking the target dentry if it's not negative */
1871 if (d_really_is_positive(target_dentry) && (rc == -EACCES || rc == -EEXIST)) {
1872 if (d_is_dir(target_dentry))
1873 tmprc = cifs_rmdir(target_dir, target_dentry);
1874 else
1875 tmprc = cifs_unlink(target_dir, target_dentry);
1876 if (tmprc)
1877 goto cifs_rename_exit;
1878 rc = cifs_do_rename(xid, source_dentry, from_name,
1879 target_dentry, to_name);
1880 }
1881
1882 /* force revalidate to go get info when needed */
1883 CIFS_I(source_dir)->time = CIFS_I(target_dir)->time = 0;
1884
1885 source_dir->i_ctime = source_dir->i_mtime = target_dir->i_ctime =
1886 target_dir->i_mtime = current_time(source_dir);
1887
1888cifs_rename_exit:
1889 kfree(info_buf_source);
1890 kfree(from_name);
1891 kfree(to_name);
1892 free_xid(xid);
1893 cifs_put_tlink(tlink);
1894 return rc;
1895}
1896
1897static bool
1898cifs_inode_needs_reval(struct inode *inode)
1899{
1900 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1901 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1902
1903 if (cifs_i->time == 0)
1904 return true;
1905
1906 if (CIFS_CACHE_READ(cifs_i))
1907 return false;
1908
1909 if (!lookupCacheEnabled)
1910 return true;
1911
1912 if (!cifs_sb->actimeo)
1913 return true;
1914
1915 if (!time_in_range(jiffies, cifs_i->time,
1916 cifs_i->time + cifs_sb->actimeo))
1917 return true;
1918
1919 /* hardlinked files w/ noserverino get "special" treatment */
1920 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
1921 S_ISREG(inode->i_mode) && inode->i_nlink != 1)
1922 return true;
1923
1924 return false;
1925}
1926
1927/*
1928 * Zap the cache. Called when invalid_mapping flag is set.
1929 */
1930int
1931cifs_invalidate_mapping(struct inode *inode)
1932{
1933 int rc = 0;
1934
1935 if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
1936 rc = invalidate_inode_pages2(inode->i_mapping);
1937 if (rc)
1938 cifs_dbg(VFS, "%s: could not invalidate inode %p\n",
1939 __func__, inode);
1940 }
1941
1942 cifs_fscache_reset_inode_cookie(inode);
1943 return rc;
1944}
1945
1946/**
1947 * cifs_wait_bit_killable - helper for functions that are sleeping on bit locks
1948 * @word: long word containing the bit lock
1949 */
1950static int
1951cifs_wait_bit_killable(struct wait_bit_key *key, int mode)
1952{
1953 freezable_schedule_unsafe();
1954 if (signal_pending_state(mode, current))
1955 return -ERESTARTSYS;
1956 return 0;
1957}
1958
1959int
1960cifs_revalidate_mapping(struct inode *inode)
1961{
1962 int rc;
1963 unsigned long *flags = &CIFS_I(inode)->flags;
1964
1965 rc = wait_on_bit_lock_action(flags, CIFS_INO_LOCK, cifs_wait_bit_killable,
1966 TASK_KILLABLE);
1967 if (rc)
1968 return rc;
1969
1970 if (test_and_clear_bit(CIFS_INO_INVALID_MAPPING, flags)) {
1971 rc = cifs_invalidate_mapping(inode);
1972 if (rc)
1973 set_bit(CIFS_INO_INVALID_MAPPING, flags);
1974 }
1975
1976 clear_bit_unlock(CIFS_INO_LOCK, flags);
1977 smp_mb__after_atomic();
1978 wake_up_bit(flags, CIFS_INO_LOCK);
1979
1980 return rc;
1981}
1982
1983int
1984cifs_zap_mapping(struct inode *inode)
1985{
1986 set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(inode)->flags);
1987 return cifs_revalidate_mapping(inode);
1988}
1989
1990int cifs_revalidate_file_attr(struct file *filp)
1991{
1992 int rc = 0;
1993 struct inode *inode = file_inode(filp);
1994 struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
1995
1996 if (!cifs_inode_needs_reval(inode))
1997 return rc;
1998
1999 if (tlink_tcon(cfile->tlink)->unix_ext)
2000 rc = cifs_get_file_info_unix(filp);
2001 else
2002 rc = cifs_get_file_info(filp);
2003
2004 return rc;
2005}
2006
2007int cifs_revalidate_dentry_attr(struct dentry *dentry)
2008{
2009 unsigned int xid;
2010 int rc = 0;
2011 struct inode *inode = d_inode(dentry);
2012 struct super_block *sb = dentry->d_sb;
2013 char *full_path = NULL;
2014
2015 if (inode == NULL)
2016 return -ENOENT;
2017
2018 if (!cifs_inode_needs_reval(inode))
2019 return rc;
2020
2021 xid = get_xid();
2022
2023 /* can not safely grab the rename sem here if rename calls revalidate
2024 since that would deadlock */
2025 full_path = build_path_from_dentry(dentry);
2026 if (full_path == NULL) {
2027 rc = -ENOMEM;
2028 goto out;
2029 }
2030
2031 cifs_dbg(FYI, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time %ld jiffies %ld\n",
2032 full_path, inode, inode->i_count.counter,
2033 dentry, cifs_get_time(dentry), jiffies);
2034
2035 if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
2036 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
2037 else
2038 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
2039 xid, NULL);
2040
2041out:
2042 kfree(full_path);
2043 free_xid(xid);
2044 return rc;
2045}
2046
2047int cifs_revalidate_file(struct file *filp)
2048{
2049 int rc;
2050 struct inode *inode = file_inode(filp);
2051
2052 rc = cifs_revalidate_file_attr(filp);
2053 if (rc)
2054 return rc;
2055
2056 return cifs_revalidate_mapping(inode);
2057}
2058
2059/* revalidate a dentry's inode attributes */
2060int cifs_revalidate_dentry(struct dentry *dentry)
2061{
2062 int rc;
2063 struct inode *inode = d_inode(dentry);
2064
2065 rc = cifs_revalidate_dentry_attr(dentry);
2066 if (rc)
2067 return rc;
2068
2069 return cifs_revalidate_mapping(inode);
2070}
2071
2072int cifs_getattr(const struct path *path, struct kstat *stat,
2073 u32 request_mask, unsigned int flags)
2074{
2075 struct dentry *dentry = path->dentry;
2076 struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
2077 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
2078 struct inode *inode = d_inode(dentry);
2079 int rc;
2080
2081 /*
2082 * We need to be sure that all dirty pages are written and the server
2083 * has actual ctime, mtime and file length.
2084 */
2085 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
2086 inode->i_mapping->nrpages != 0) {
2087 rc = filemap_fdatawait(inode->i_mapping);
2088 if (rc) {
2089 mapping_set_error(inode->i_mapping, rc);
2090 return rc;
2091 }
2092 }
2093
2094 rc = cifs_revalidate_dentry_attr(dentry);
2095 if (rc)
2096 return rc;
2097
2098 generic_fillattr(inode, stat);
2099 stat->blksize = cifs_sb->bsize;
2100 stat->ino = CIFS_I(inode)->uniqueid;
2101
2102 /* old CIFS Unix Extensions doesn't return create time */
2103 if (CIFS_I(inode)->createtime) {
2104 stat->result_mask |= STATX_BTIME;
2105 stat->btime =
2106 cifs_NTtimeToUnix(cpu_to_le64(CIFS_I(inode)->createtime));
2107 }
2108
2109 stat->attributes_mask |= (STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED);
2110 if (CIFS_I(inode)->cifsAttrs & FILE_ATTRIBUTE_COMPRESSED)
2111 stat->attributes |= STATX_ATTR_COMPRESSED;
2112 if (CIFS_I(inode)->cifsAttrs & FILE_ATTRIBUTE_ENCRYPTED)
2113 stat->attributes |= STATX_ATTR_ENCRYPTED;
2114
2115 /*
2116 * If on a multiuser mount without unix extensions or cifsacl being
2117 * enabled, and the admin hasn't overridden them, set the ownership
2118 * to the fsuid/fsgid of the current process.
2119 */
2120 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
2121 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
2122 !tcon->unix_ext) {
2123 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
2124 stat->uid = current_fsuid();
2125 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
2126 stat->gid = current_fsgid();
2127 }
2128 return rc;
2129}
2130
2131int cifs_fiemap(struct inode *inode, struct fiemap_extent_info *fei, u64 start,
2132 u64 len)
2133{
2134 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
2135 struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_i->vfs_inode.i_sb);
2136 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
2137 struct TCP_Server_Info *server = tcon->ses->server;
2138 struct cifsFileInfo *cfile;
2139 int rc;
2140
2141 /*
2142 * We need to be sure that all dirty pages are written as they
2143 * might fill holes on the server.
2144 */
2145 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
2146 inode->i_mapping->nrpages != 0) {
2147 rc = filemap_fdatawait(inode->i_mapping);
2148 if (rc) {
2149 mapping_set_error(inode->i_mapping, rc);
2150 return rc;
2151 }
2152 }
2153
2154 cfile = find_readable_file(cifs_i, false);
2155 if (cfile == NULL)
2156 return -EINVAL;
2157
2158 if (server->ops->fiemap) {
2159 rc = server->ops->fiemap(tcon, cfile, fei, start, len);
2160 cifsFileInfo_put(cfile);
2161 return rc;
2162 }
2163
2164 cifsFileInfo_put(cfile);
2165 return -ENOTSUPP;
2166}
2167
2168static int cifs_truncate_page(struct address_space *mapping, loff_t from)
2169{
2170 pgoff_t index = from >> PAGE_SHIFT;
2171 unsigned offset = from & (PAGE_SIZE - 1);
2172 struct page *page;
2173 int rc = 0;
2174
2175 page = grab_cache_page(mapping, index);
2176 if (!page)
2177 return -ENOMEM;
2178
2179 zero_user_segment(page, offset, PAGE_SIZE);
2180 unlock_page(page);
2181 put_page(page);
2182 return rc;
2183}
2184
2185static void cifs_setsize(struct inode *inode, loff_t offset)
2186{
2187 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
2188
2189 spin_lock(&inode->i_lock);
2190 i_size_write(inode, offset);
2191 spin_unlock(&inode->i_lock);
2192
2193 /* Cached inode must be refreshed on truncate */
2194 cifs_i->time = 0;
2195 truncate_pagecache(inode, offset);
2196}
2197
2198static int
2199cifs_set_file_size(struct inode *inode, struct iattr *attrs,
2200 unsigned int xid, char *full_path)
2201{
2202 int rc;
2203 struct cifsFileInfo *open_file;
2204 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2205 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2206 struct tcon_link *tlink = NULL;
2207 struct cifs_tcon *tcon = NULL;
2208 struct TCP_Server_Info *server;
2209
2210 /*
2211 * To avoid spurious oplock breaks from server, in the case of
2212 * inodes that we already have open, avoid doing path based
2213 * setting of file size if we can do it by handle.
2214 * This keeps our caching token (oplock) and avoids timeouts
2215 * when the local oplock break takes longer to flush
2216 * writebehind data than the SMB timeout for the SetPathInfo
2217 * request would allow
2218 */
2219 open_file = find_writable_file(cifsInode, true);
2220 if (open_file) {
2221 tcon = tlink_tcon(open_file->tlink);
2222 server = tcon->ses->server;
2223 if (server->ops->set_file_size)
2224 rc = server->ops->set_file_size(xid, tcon, open_file,
2225 attrs->ia_size, false);
2226 else
2227 rc = -ENOSYS;
2228 cifsFileInfo_put(open_file);
2229 cifs_dbg(FYI, "SetFSize for attrs rc = %d\n", rc);
2230 } else
2231 rc = -EINVAL;
2232
2233 if (!rc)
2234 goto set_size_out;
2235
2236 if (tcon == NULL) {
2237 tlink = cifs_sb_tlink(cifs_sb);
2238 if (IS_ERR(tlink))
2239 return PTR_ERR(tlink);
2240 tcon = tlink_tcon(tlink);
2241 server = tcon->ses->server;
2242 }
2243
2244 /*
2245 * Set file size by pathname rather than by handle either because no
2246 * valid, writeable file handle for it was found or because there was
2247 * an error setting it by handle.
2248 */
2249 if (server->ops->set_path_size)
2250 rc = server->ops->set_path_size(xid, tcon, full_path,
2251 attrs->ia_size, cifs_sb, false);
2252 else
2253 rc = -ENOSYS;
2254 cifs_dbg(FYI, "SetEOF by path (setattrs) rc = %d\n", rc);
2255
2256 if (tlink)
2257 cifs_put_tlink(tlink);
2258
2259set_size_out:
2260 if (rc == 0) {
2261 cifsInode->server_eof = attrs->ia_size;
2262 cifs_setsize(inode, attrs->ia_size);
2263 cifs_truncate_page(inode->i_mapping, inode->i_size);
2264 }
2265
2266 return rc;
2267}
2268
2269static int
2270cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
2271{
2272 int rc;
2273 unsigned int xid;
2274 char *full_path = NULL;
2275 struct inode *inode = d_inode(direntry);
2276 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2277 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2278 struct tcon_link *tlink;
2279 struct cifs_tcon *pTcon;
2280 struct cifs_unix_set_info_args *args = NULL;
2281 struct cifsFileInfo *open_file;
2282
2283 cifs_dbg(FYI, "setattr_unix on file %pd attrs->ia_valid=0x%x\n",
2284 direntry, attrs->ia_valid);
2285
2286 xid = get_xid();
2287
2288 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2289 attrs->ia_valid |= ATTR_FORCE;
2290
2291 rc = setattr_prepare(direntry, attrs);
2292 if (rc < 0)
2293 goto out;
2294
2295 full_path = build_path_from_dentry(direntry);
2296 if (full_path == NULL) {
2297 rc = -ENOMEM;
2298 goto out;
2299 }
2300
2301 /*
2302 * Attempt to flush data before changing attributes. We need to do
2303 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2304 * ownership or mode then we may also need to do this. Here, we take
2305 * the safe way out and just do the flush on all setattr requests. If
2306 * the flush returns error, store it to report later and continue.
2307 *
2308 * BB: This should be smarter. Why bother flushing pages that
2309 * will be truncated anyway? Also, should we error out here if
2310 * the flush returns error?
2311 */
2312 rc = filemap_write_and_wait(inode->i_mapping);
2313 if (is_interrupt_error(rc)) {
2314 rc = -ERESTARTSYS;
2315 goto out;
2316 }
2317
2318 mapping_set_error(inode->i_mapping, rc);
2319 rc = 0;
2320
2321 if (attrs->ia_valid & ATTR_SIZE) {
2322 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2323 if (rc != 0)
2324 goto out;
2325 }
2326
2327 /* skip mode change if it's just for clearing setuid/setgid */
2328 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2329 attrs->ia_valid &= ~ATTR_MODE;
2330
2331 args = kmalloc(sizeof(*args), GFP_KERNEL);
2332 if (args == NULL) {
2333 rc = -ENOMEM;
2334 goto out;
2335 }
2336
2337 /* set up the struct */
2338 if (attrs->ia_valid & ATTR_MODE)
2339 args->mode = attrs->ia_mode;
2340 else
2341 args->mode = NO_CHANGE_64;
2342
2343 if (attrs->ia_valid & ATTR_UID)
2344 args->uid = attrs->ia_uid;
2345 else
2346 args->uid = INVALID_UID; /* no change */
2347
2348 if (attrs->ia_valid & ATTR_GID)
2349 args->gid = attrs->ia_gid;
2350 else
2351 args->gid = INVALID_GID; /* no change */
2352
2353 if (attrs->ia_valid & ATTR_ATIME)
2354 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
2355 else
2356 args->atime = NO_CHANGE_64;
2357
2358 if (attrs->ia_valid & ATTR_MTIME)
2359 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
2360 else
2361 args->mtime = NO_CHANGE_64;
2362
2363 if (attrs->ia_valid & ATTR_CTIME)
2364 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
2365 else
2366 args->ctime = NO_CHANGE_64;
2367
2368 args->device = 0;
2369 open_file = find_writable_file(cifsInode, true);
2370 if (open_file) {
2371 u16 nfid = open_file->fid.netfid;
2372 u32 npid = open_file->pid;
2373 pTcon = tlink_tcon(open_file->tlink);
2374 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
2375 cifsFileInfo_put(open_file);
2376 } else {
2377 tlink = cifs_sb_tlink(cifs_sb);
2378 if (IS_ERR(tlink)) {
2379 rc = PTR_ERR(tlink);
2380 goto out;
2381 }
2382 pTcon = tlink_tcon(tlink);
2383 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
2384 cifs_sb->local_nls,
2385 cifs_remap(cifs_sb));
2386 cifs_put_tlink(tlink);
2387 }
2388
2389 if (rc)
2390 goto out;
2391
2392 if ((attrs->ia_valid & ATTR_SIZE) &&
2393 attrs->ia_size != i_size_read(inode))
2394 truncate_setsize(inode, attrs->ia_size);
2395
2396 setattr_copy(inode, attrs);
2397 mark_inode_dirty(inode);
2398
2399 /* force revalidate when any of these times are set since some
2400 of the fs types (eg ext3, fat) do not have fine enough
2401 time granularity to match protocol, and we do not have a
2402 a way (yet) to query the server fs's time granularity (and
2403 whether it rounds times down).
2404 */
2405 if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
2406 cifsInode->time = 0;
2407out:
2408 kfree(args);
2409 kfree(full_path);
2410 free_xid(xid);
2411 return rc;
2412}
2413
2414static int
2415cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
2416{
2417 unsigned int xid;
2418 kuid_t uid = INVALID_UID;
2419 kgid_t gid = INVALID_GID;
2420 struct inode *inode = d_inode(direntry);
2421 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2422 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2423 struct cifsFileInfo *wfile;
2424 struct cifs_tcon *tcon;
2425 char *full_path = NULL;
2426 int rc = -EACCES;
2427 __u32 dosattr = 0;
2428 __u64 mode = NO_CHANGE_64;
2429
2430 xid = get_xid();
2431
2432 cifs_dbg(FYI, "setattr on file %pd attrs->ia_valid 0x%x\n",
2433 direntry, attrs->ia_valid);
2434
2435 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2436 attrs->ia_valid |= ATTR_FORCE;
2437
2438 rc = setattr_prepare(direntry, attrs);
2439 if (rc < 0) {
2440 free_xid(xid);
2441 return rc;
2442 }
2443
2444 full_path = build_path_from_dentry(direntry);
2445 if (full_path == NULL) {
2446 rc = -ENOMEM;
2447 free_xid(xid);
2448 return rc;
2449 }
2450
2451 /*
2452 * Attempt to flush data before changing attributes. We need to do
2453 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2454 * ownership or mode then we may also need to do this. Here, we take
2455 * the safe way out and just do the flush on all setattr requests. If
2456 * the flush returns error, store it to report later and continue.
2457 *
2458 * BB: This should be smarter. Why bother flushing pages that
2459 * will be truncated anyway? Also, should we error out here if
2460 * the flush returns error?
2461 */
2462 rc = filemap_write_and_wait(inode->i_mapping);
2463 if (is_interrupt_error(rc)) {
2464 rc = -ERESTARTSYS;
2465 goto cifs_setattr_exit;
2466 }
2467
2468 mapping_set_error(inode->i_mapping, rc);
2469 rc = 0;
2470
2471 if (attrs->ia_valid & ATTR_MTIME) {
2472 rc = cifs_get_writable_file(cifsInode, false, &wfile);
2473 if (!rc) {
2474 tcon = tlink_tcon(wfile->tlink);
2475 rc = tcon->ses->server->ops->flush(xid, tcon, &wfile->fid);
2476 cifsFileInfo_put(wfile);
2477 if (rc)
2478 goto cifs_setattr_exit;
2479 } else if (rc != -EBADF)
2480 goto cifs_setattr_exit;
2481 else
2482 rc = 0;
2483 }
2484
2485 if (attrs->ia_valid & ATTR_SIZE) {
2486 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2487 if (rc != 0)
2488 goto cifs_setattr_exit;
2489 }
2490
2491 if (attrs->ia_valid & ATTR_UID)
2492 uid = attrs->ia_uid;
2493
2494 if (attrs->ia_valid & ATTR_GID)
2495 gid = attrs->ia_gid;
2496
2497 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) ||
2498 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)) {
2499 if (uid_valid(uid) || gid_valid(gid)) {
2500 rc = id_mode_to_cifs_acl(inode, full_path, NO_CHANGE_64,
2501 uid, gid);
2502 if (rc) {
2503 cifs_dbg(FYI, "%s: Setting id failed with error: %d\n",
2504 __func__, rc);
2505 goto cifs_setattr_exit;
2506 }
2507 }
2508 } else
2509 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
2510 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
2511
2512 /* skip mode change if it's just for clearing setuid/setgid */
2513 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2514 attrs->ia_valid &= ~ATTR_MODE;
2515
2516 if (attrs->ia_valid & ATTR_MODE) {
2517 mode = attrs->ia_mode;
2518 rc = 0;
2519 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) ||
2520 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)) {
2521 rc = id_mode_to_cifs_acl(inode, full_path, mode,
2522 INVALID_UID, INVALID_GID);
2523 if (rc) {
2524 cifs_dbg(FYI, "%s: Setting ACL failed with error: %d\n",
2525 __func__, rc);
2526 goto cifs_setattr_exit;
2527 }
2528 } else
2529 if (((mode & S_IWUGO) == 0) &&
2530 (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
2531
2532 dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
2533
2534 /* fix up mode if we're not using dynperm */
2535 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
2536 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
2537 } else if ((mode & S_IWUGO) &&
2538 (cifsInode->cifsAttrs & ATTR_READONLY)) {
2539
2540 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
2541 /* Attributes of 0 are ignored */
2542 if (dosattr == 0)
2543 dosattr |= ATTR_NORMAL;
2544
2545 /* reset local inode permissions to normal */
2546 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2547 attrs->ia_mode &= ~(S_IALLUGO);
2548 if (S_ISDIR(inode->i_mode))
2549 attrs->ia_mode |=
2550 cifs_sb->mnt_dir_mode;
2551 else
2552 attrs->ia_mode |=
2553 cifs_sb->mnt_file_mode;
2554 }
2555 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2556 /* ignore mode change - ATTR_READONLY hasn't changed */
2557 attrs->ia_valid &= ~ATTR_MODE;
2558 }
2559 }
2560
2561 if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
2562 ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
2563 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
2564 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
2565
2566 /* Even if error on time set, no sense failing the call if
2567 the server would set the time to a reasonable value anyway,
2568 and this check ensures that we are not being called from
2569 sys_utimes in which case we ought to fail the call back to
2570 the user when the server rejects the call */
2571 if ((rc) && (attrs->ia_valid &
2572 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
2573 rc = 0;
2574 }
2575
2576 /* do not need local check to inode_check_ok since the server does
2577 that */
2578 if (rc)
2579 goto cifs_setattr_exit;
2580
2581 if ((attrs->ia_valid & ATTR_SIZE) &&
2582 attrs->ia_size != i_size_read(inode))
2583 truncate_setsize(inode, attrs->ia_size);
2584
2585 setattr_copy(inode, attrs);
2586 mark_inode_dirty(inode);
2587
2588cifs_setattr_exit:
2589 kfree(full_path);
2590 free_xid(xid);
2591 return rc;
2592}
2593
2594int
2595cifs_setattr(struct dentry *direntry, struct iattr *attrs)
2596{
2597 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
2598 struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
2599
2600 if (pTcon->unix_ext)
2601 return cifs_setattr_unix(direntry, attrs);
2602
2603 return cifs_setattr_nounix(direntry, attrs);
2604
2605 /* BB: add cifs_setattr_legacy for really old servers */
2606}
2607
2608#if 0
2609void cifs_delete_inode(struct inode *inode)
2610{
2611 cifs_dbg(FYI, "In cifs_delete_inode, inode = 0x%p\n", inode);
2612 /* may have to add back in if and when safe distributed caching of
2613 directories added e.g. via FindNotify */
2614}
2615#endif