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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 <asm/div64.h>
26#include "cifsfs.h"
27#include "cifspdu.h"
28#include "cifsglob.h"
29#include "cifsproto.h"
30#include "cifs_debug.h"
31#include "cifs_fs_sb.h"
32#include "fscache.h"
33
34
35static void cifs_set_ops(struct inode *inode)
36{
37 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
38
39 switch (inode->i_mode & S_IFMT) {
40 case S_IFREG:
41 inode->i_op = &cifs_file_inode_ops;
42 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
43 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
44 inode->i_fop = &cifs_file_direct_nobrl_ops;
45 else
46 inode->i_fop = &cifs_file_direct_ops;
47 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
48 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
49 inode->i_fop = &cifs_file_strict_nobrl_ops;
50 else
51 inode->i_fop = &cifs_file_strict_ops;
52 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
53 inode->i_fop = &cifs_file_nobrl_ops;
54 else { /* not direct, send byte range locks */
55 inode->i_fop = &cifs_file_ops;
56 }
57
58 /* check if server can support readpages */
59 if (cifs_sb_master_tcon(cifs_sb)->ses->server->maxBuf <
60 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
61 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
62 else
63 inode->i_data.a_ops = &cifs_addr_ops;
64 break;
65 case S_IFDIR:
66#ifdef CONFIG_CIFS_DFS_UPCALL
67 if (IS_AUTOMOUNT(inode)) {
68 inode->i_op = &cifs_dfs_referral_inode_operations;
69 } else {
70#else /* NO DFS support, treat as a directory */
71 {
72#endif
73 inode->i_op = &cifs_dir_inode_ops;
74 inode->i_fop = &cifs_dir_ops;
75 }
76 break;
77 case S_IFLNK:
78 inode->i_op = &cifs_symlink_inode_ops;
79 break;
80 default:
81 init_special_inode(inode, inode->i_mode, inode->i_rdev);
82 break;
83 }
84}
85
86/* check inode attributes against fattr. If they don't match, tag the
87 * inode for cache invalidation
88 */
89static void
90cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
91{
92 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
93
94 cFYI(1, "%s: revalidating inode %llu", __func__, cifs_i->uniqueid);
95
96 if (inode->i_state & I_NEW) {
97 cFYI(1, "%s: inode %llu is new", __func__, cifs_i->uniqueid);
98 return;
99 }
100
101 /* don't bother with revalidation if we have an oplock */
102 if (cifs_i->clientCanCacheRead) {
103 cFYI(1, "%s: inode %llu is oplocked", __func__,
104 cifs_i->uniqueid);
105 return;
106 }
107
108 /* revalidate if mtime or size have changed */
109 if (timespec_equal(&inode->i_mtime, &fattr->cf_mtime) &&
110 cifs_i->server_eof == fattr->cf_eof) {
111 cFYI(1, "%s: inode %llu is unchanged", __func__,
112 cifs_i->uniqueid);
113 return;
114 }
115
116 cFYI(1, "%s: invalidating inode %llu mapping", __func__,
117 cifs_i->uniqueid);
118 cifs_i->invalid_mapping = true;
119}
120
121/* populate an inode with info from a cifs_fattr struct */
122void
123cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
124{
125 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
126 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
127 unsigned long oldtime = cifs_i->time;
128
129 cifs_revalidate_cache(inode, fattr);
130
131 inode->i_atime = fattr->cf_atime;
132 inode->i_mtime = fattr->cf_mtime;
133 inode->i_ctime = fattr->cf_ctime;
134 inode->i_rdev = fattr->cf_rdev;
135 set_nlink(inode, fattr->cf_nlink);
136 inode->i_uid = fattr->cf_uid;
137 inode->i_gid = fattr->cf_gid;
138
139 /* if dynperm is set, don't clobber existing mode */
140 if (inode->i_state & I_NEW ||
141 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM))
142 inode->i_mode = fattr->cf_mode;
143
144 cifs_i->cifsAttrs = fattr->cf_cifsattrs;
145
146 if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
147 cifs_i->time = 0;
148 else
149 cifs_i->time = jiffies;
150
151 cFYI(1, "inode 0x%p old_time=%ld new_time=%ld", inode,
152 oldtime, cifs_i->time);
153
154 cifs_i->delete_pending = fattr->cf_flags & CIFS_FATTR_DELETE_PENDING;
155
156 cifs_i->server_eof = fattr->cf_eof;
157 /*
158 * Can't safely change the file size here if the client is writing to
159 * it due to potential races.
160 */
161 spin_lock(&inode->i_lock);
162 if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) {
163 i_size_write(inode, fattr->cf_eof);
164
165 /*
166 * i_blocks is not related to (i_size / i_blksize),
167 * but instead 512 byte (2**9) size is required for
168 * calculating num blocks.
169 */
170 inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
171 }
172 spin_unlock(&inode->i_lock);
173
174 if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL)
175 inode->i_flags |= S_AUTOMOUNT;
176 cifs_set_ops(inode);
177}
178
179void
180cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
181{
182 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
183
184 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
185 return;
186
187 fattr->cf_uniqueid = iunique(sb, ROOT_I);
188}
189
190/* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
191void
192cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
193 struct cifs_sb_info *cifs_sb)
194{
195 memset(fattr, 0, sizeof(*fattr));
196 fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
197 fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
198 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
199
200 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
201 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime);
202 fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange);
203 fattr->cf_mode = le64_to_cpu(info->Permissions);
204
205 /*
206 * Since we set the inode type below we need to mask off
207 * to avoid strange results if bits set above.
208 */
209 fattr->cf_mode &= ~S_IFMT;
210 switch (le32_to_cpu(info->Type)) {
211 case UNIX_FILE:
212 fattr->cf_mode |= S_IFREG;
213 fattr->cf_dtype = DT_REG;
214 break;
215 case UNIX_SYMLINK:
216 fattr->cf_mode |= S_IFLNK;
217 fattr->cf_dtype = DT_LNK;
218 break;
219 case UNIX_DIR:
220 fattr->cf_mode |= S_IFDIR;
221 fattr->cf_dtype = DT_DIR;
222 break;
223 case UNIX_CHARDEV:
224 fattr->cf_mode |= S_IFCHR;
225 fattr->cf_dtype = DT_CHR;
226 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
227 le64_to_cpu(info->DevMinor) & MINORMASK);
228 break;
229 case UNIX_BLOCKDEV:
230 fattr->cf_mode |= S_IFBLK;
231 fattr->cf_dtype = DT_BLK;
232 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
233 le64_to_cpu(info->DevMinor) & MINORMASK);
234 break;
235 case UNIX_FIFO:
236 fattr->cf_mode |= S_IFIFO;
237 fattr->cf_dtype = DT_FIFO;
238 break;
239 case UNIX_SOCKET:
240 fattr->cf_mode |= S_IFSOCK;
241 fattr->cf_dtype = DT_SOCK;
242 break;
243 default:
244 /* safest to call it a file if we do not know */
245 fattr->cf_mode |= S_IFREG;
246 fattr->cf_dtype = DT_REG;
247 cFYI(1, "unknown type %d", le32_to_cpu(info->Type));
248 break;
249 }
250
251 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
252 fattr->cf_uid = cifs_sb->mnt_uid;
253 else
254 fattr->cf_uid = le64_to_cpu(info->Uid);
255
256 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
257 fattr->cf_gid = cifs_sb->mnt_gid;
258 else
259 fattr->cf_gid = le64_to_cpu(info->Gid);
260
261 fattr->cf_nlink = le64_to_cpu(info->Nlinks);
262}
263
264/*
265 * Fill a cifs_fattr struct with fake inode info.
266 *
267 * Needed to setup cifs_fattr data for the directory which is the
268 * junction to the new submount (ie to setup the fake directory
269 * which represents a DFS referral).
270 */
271static void
272cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
273{
274 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
275
276 cFYI(1, "creating fake fattr for DFS referral");
277
278 memset(fattr, 0, sizeof(*fattr));
279 fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
280 fattr->cf_uid = cifs_sb->mnt_uid;
281 fattr->cf_gid = cifs_sb->mnt_gid;
282 fattr->cf_atime = CURRENT_TIME;
283 fattr->cf_ctime = CURRENT_TIME;
284 fattr->cf_mtime = CURRENT_TIME;
285 fattr->cf_nlink = 2;
286 fattr->cf_flags |= CIFS_FATTR_DFS_REFERRAL;
287}
288
289int cifs_get_file_info_unix(struct file *filp)
290{
291 int rc;
292 int xid;
293 FILE_UNIX_BASIC_INFO find_data;
294 struct cifs_fattr fattr;
295 struct inode *inode = filp->f_path.dentry->d_inode;
296 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
297 struct cifsFileInfo *cfile = filp->private_data;
298 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
299
300 xid = GetXid();
301 rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->netfid, &find_data);
302 if (!rc) {
303 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
304 } else if (rc == -EREMOTE) {
305 cifs_create_dfs_fattr(&fattr, inode->i_sb);
306 rc = 0;
307 }
308
309 cifs_fattr_to_inode(inode, &fattr);
310 FreeXid(xid);
311 return rc;
312}
313
314int cifs_get_inode_info_unix(struct inode **pinode,
315 const unsigned char *full_path,
316 struct super_block *sb, int xid)
317{
318 int rc;
319 FILE_UNIX_BASIC_INFO find_data;
320 struct cifs_fattr fattr;
321 struct cifs_tcon *tcon;
322 struct tcon_link *tlink;
323 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
324
325 cFYI(1, "Getting info on %s", full_path);
326
327 tlink = cifs_sb_tlink(cifs_sb);
328 if (IS_ERR(tlink))
329 return PTR_ERR(tlink);
330 tcon = tlink_tcon(tlink);
331
332 /* could have done a find first instead but this returns more info */
333 rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
334 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
335 CIFS_MOUNT_MAP_SPECIAL_CHR);
336 cifs_put_tlink(tlink);
337
338 if (!rc) {
339 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
340 } else if (rc == -EREMOTE) {
341 cifs_create_dfs_fattr(&fattr, sb);
342 rc = 0;
343 } else {
344 return rc;
345 }
346
347 /* check for Minshall+French symlinks */
348 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
349 int tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
350 if (tmprc)
351 cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
352 }
353
354 if (*pinode == NULL) {
355 /* get new inode */
356 cifs_fill_uniqueid(sb, &fattr);
357 *pinode = cifs_iget(sb, &fattr);
358 if (!*pinode)
359 rc = -ENOMEM;
360 } else {
361 /* we already have inode, update it */
362 cifs_fattr_to_inode(*pinode, &fattr);
363 }
364
365 return rc;
366}
367
368static int
369cifs_sfu_type(struct cifs_fattr *fattr, const unsigned char *path,
370 struct cifs_sb_info *cifs_sb, int xid)
371{
372 int rc;
373 int oplock = 0;
374 __u16 netfid;
375 struct tcon_link *tlink;
376 struct cifs_tcon *tcon;
377 struct cifs_io_parms io_parms;
378 char buf[24];
379 unsigned int bytes_read;
380 char *pbuf;
381
382 pbuf = buf;
383
384 fattr->cf_mode &= ~S_IFMT;
385
386 if (fattr->cf_eof == 0) {
387 fattr->cf_mode |= S_IFIFO;
388 fattr->cf_dtype = DT_FIFO;
389 return 0;
390 } else if (fattr->cf_eof < 8) {
391 fattr->cf_mode |= S_IFREG;
392 fattr->cf_dtype = DT_REG;
393 return -EINVAL; /* EOPNOTSUPP? */
394 }
395
396 tlink = cifs_sb_tlink(cifs_sb);
397 if (IS_ERR(tlink))
398 return PTR_ERR(tlink);
399 tcon = tlink_tcon(tlink);
400
401 rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, GENERIC_READ,
402 CREATE_NOT_DIR, &netfid, &oplock, NULL,
403 cifs_sb->local_nls,
404 cifs_sb->mnt_cifs_flags &
405 CIFS_MOUNT_MAP_SPECIAL_CHR);
406 if (rc == 0) {
407 int buf_type = CIFS_NO_BUFFER;
408 /* Read header */
409 io_parms.netfid = netfid;
410 io_parms.pid = current->tgid;
411 io_parms.tcon = tcon;
412 io_parms.offset = 0;
413 io_parms.length = 24;
414 rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf,
415 &buf_type);
416 if ((rc == 0) && (bytes_read >= 8)) {
417 if (memcmp("IntxBLK", pbuf, 8) == 0) {
418 cFYI(1, "Block device");
419 fattr->cf_mode |= S_IFBLK;
420 fattr->cf_dtype = DT_BLK;
421 if (bytes_read == 24) {
422 /* we have enough to decode dev num */
423 __u64 mjr; /* major */
424 __u64 mnr; /* minor */
425 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
426 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
427 fattr->cf_rdev = MKDEV(mjr, mnr);
428 }
429 } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
430 cFYI(1, "Char device");
431 fattr->cf_mode |= S_IFCHR;
432 fattr->cf_dtype = DT_CHR;
433 if (bytes_read == 24) {
434 /* we have enough to decode dev num */
435 __u64 mjr; /* major */
436 __u64 mnr; /* minor */
437 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
438 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
439 fattr->cf_rdev = MKDEV(mjr, mnr);
440 }
441 } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
442 cFYI(1, "Symlink");
443 fattr->cf_mode |= S_IFLNK;
444 fattr->cf_dtype = DT_LNK;
445 } else {
446 fattr->cf_mode |= S_IFREG; /* file? */
447 fattr->cf_dtype = DT_REG;
448 rc = -EOPNOTSUPP;
449 }
450 } else {
451 fattr->cf_mode |= S_IFREG; /* then it is a file */
452 fattr->cf_dtype = DT_REG;
453 rc = -EOPNOTSUPP; /* or some unknown SFU type */
454 }
455 CIFSSMBClose(xid, tcon, netfid);
456 }
457 cifs_put_tlink(tlink);
458 return rc;
459}
460
461#define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */
462
463/*
464 * Fetch mode bits as provided by SFU.
465 *
466 * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ?
467 */
468static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
469 struct cifs_sb_info *cifs_sb, int xid)
470{
471#ifdef CONFIG_CIFS_XATTR
472 ssize_t rc;
473 char ea_value[4];
474 __u32 mode;
475 struct tcon_link *tlink;
476 struct cifs_tcon *tcon;
477
478 tlink = cifs_sb_tlink(cifs_sb);
479 if (IS_ERR(tlink))
480 return PTR_ERR(tlink);
481 tcon = tlink_tcon(tlink);
482
483 rc = CIFSSMBQAllEAs(xid, tcon, path, "SETFILEBITS",
484 ea_value, 4 /* size of buf */, cifs_sb->local_nls,
485 cifs_sb->mnt_cifs_flags &
486 CIFS_MOUNT_MAP_SPECIAL_CHR);
487 cifs_put_tlink(tlink);
488 if (rc < 0)
489 return (int)rc;
490 else if (rc > 3) {
491 mode = le32_to_cpu(*((__le32 *)ea_value));
492 fattr->cf_mode &= ~SFBITS_MASK;
493 cFYI(1, "special bits 0%o org mode 0%o", mode,
494 fattr->cf_mode);
495 fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode;
496 cFYI(1, "special mode bits 0%o", mode);
497 }
498
499 return 0;
500#else
501 return -EOPNOTSUPP;
502#endif
503}
504
505/* Fill a cifs_fattr struct with info from FILE_ALL_INFO */
506static void
507cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
508 struct cifs_sb_info *cifs_sb, bool adjust_tz)
509{
510 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
511
512 memset(fattr, 0, sizeof(*fattr));
513 fattr->cf_cifsattrs = le32_to_cpu(info->Attributes);
514 if (info->DeletePending)
515 fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING;
516
517 if (info->LastAccessTime)
518 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
519 else
520 fattr->cf_atime = CURRENT_TIME;
521
522 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
523 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
524
525 if (adjust_tz) {
526 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
527 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
528 }
529
530 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
531 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
532 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
533
534 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
535 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
536 fattr->cf_dtype = DT_DIR;
537 /*
538 * Server can return wrong NumberOfLinks value for directories
539 * when Unix extensions are disabled - fake it.
540 */
541 fattr->cf_nlink = 2;
542 } else {
543 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
544 fattr->cf_dtype = DT_REG;
545
546 /* clear write bits if ATTR_READONLY is set */
547 if (fattr->cf_cifsattrs & ATTR_READONLY)
548 fattr->cf_mode &= ~(S_IWUGO);
549
550 fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
551 }
552
553 fattr->cf_uid = cifs_sb->mnt_uid;
554 fattr->cf_gid = cifs_sb->mnt_gid;
555}
556
557int cifs_get_file_info(struct file *filp)
558{
559 int rc;
560 int xid;
561 FILE_ALL_INFO find_data;
562 struct cifs_fattr fattr;
563 struct inode *inode = filp->f_path.dentry->d_inode;
564 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
565 struct cifsFileInfo *cfile = filp->private_data;
566 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
567
568 xid = GetXid();
569 rc = CIFSSMBQFileInfo(xid, tcon, cfile->netfid, &find_data);
570 switch (rc) {
571 case 0:
572 cifs_all_info_to_fattr(&fattr, &find_data, cifs_sb, false);
573 break;
574 case -EREMOTE:
575 cifs_create_dfs_fattr(&fattr, inode->i_sb);
576 rc = 0;
577 break;
578 case -EOPNOTSUPP:
579 case -EINVAL:
580 /*
581 * FIXME: legacy server -- fall back to path-based call?
582 * for now, just skip revalidating and mark inode for
583 * immediate reval.
584 */
585 rc = 0;
586 CIFS_I(inode)->time = 0;
587 default:
588 goto cgfi_exit;
589 }
590
591 /*
592 * don't bother with SFU junk here -- just mark inode as needing
593 * revalidation.
594 */
595 fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
596 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
597 cifs_fattr_to_inode(inode, &fattr);
598cgfi_exit:
599 FreeXid(xid);
600 return rc;
601}
602
603int cifs_get_inode_info(struct inode **pinode,
604 const unsigned char *full_path, FILE_ALL_INFO *pfindData,
605 struct super_block *sb, int xid, const __u16 *pfid)
606{
607 int rc = 0, tmprc;
608 struct cifs_tcon *pTcon;
609 struct tcon_link *tlink;
610 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
611 char *buf = NULL;
612 bool adjustTZ = false;
613 struct cifs_fattr fattr;
614
615 tlink = cifs_sb_tlink(cifs_sb);
616 if (IS_ERR(tlink))
617 return PTR_ERR(tlink);
618 pTcon = tlink_tcon(tlink);
619
620 cFYI(1, "Getting info on %s", full_path);
621
622 if ((pfindData == NULL) && (*pinode != NULL)) {
623 if (CIFS_I(*pinode)->clientCanCacheRead) {
624 cFYI(1, "No need to revalidate cached inode sizes");
625 goto cgii_exit;
626 }
627 }
628
629 /* if file info not passed in then get it from server */
630 if (pfindData == NULL) {
631 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
632 if (buf == NULL) {
633 rc = -ENOMEM;
634 goto cgii_exit;
635 }
636 pfindData = (FILE_ALL_INFO *)buf;
637
638 /* could do find first instead but this returns more info */
639 rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
640 0 /* not legacy */,
641 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
642 CIFS_MOUNT_MAP_SPECIAL_CHR);
643 /* BB optimize code so we do not make the above call
644 when server claims no NT SMB support and the above call
645 failed at least once - set flag in tcon or mount */
646 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
647 rc = SMBQueryInformation(xid, pTcon, full_path,
648 pfindData, cifs_sb->local_nls,
649 cifs_sb->mnt_cifs_flags &
650 CIFS_MOUNT_MAP_SPECIAL_CHR);
651 adjustTZ = true;
652 }
653 }
654
655 if (!rc) {
656 cifs_all_info_to_fattr(&fattr, (FILE_ALL_INFO *) pfindData,
657 cifs_sb, adjustTZ);
658 } else if (rc == -EREMOTE) {
659 cifs_create_dfs_fattr(&fattr, sb);
660 rc = 0;
661 } else {
662 goto cgii_exit;
663 }
664
665 /*
666 * If an inode wasn't passed in, then get the inode number
667 *
668 * Is an i_ino of zero legal? Can we use that to check if the server
669 * supports returning inode numbers? Are there other sanity checks we
670 * can use to ensure that the server is really filling in that field?
671 *
672 * We can not use the IndexNumber field by default from Windows or
673 * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA
674 * CIFS spec claims that this value is unique within the scope of a
675 * share, and the windows docs hint that it's actually unique
676 * per-machine.
677 *
678 * There may be higher info levels that work but are there Windows
679 * server or network appliances for which IndexNumber field is not
680 * guaranteed unique?
681 */
682 if (*pinode == NULL) {
683 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
684 int rc1 = 0;
685
686 rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
687 full_path, &fattr.cf_uniqueid,
688 cifs_sb->local_nls,
689 cifs_sb->mnt_cifs_flags &
690 CIFS_MOUNT_MAP_SPECIAL_CHR);
691 if (rc1 || !fattr.cf_uniqueid) {
692 cFYI(1, "GetSrvInodeNum rc %d", rc1);
693 fattr.cf_uniqueid = iunique(sb, ROOT_I);
694 cifs_autodisable_serverino(cifs_sb);
695 }
696 } else {
697 fattr.cf_uniqueid = iunique(sb, ROOT_I);
698 }
699 } else {
700 fattr.cf_uniqueid = CIFS_I(*pinode)->uniqueid;
701 }
702
703 /* query for SFU type info if supported and needed */
704 if (fattr.cf_cifsattrs & ATTR_SYSTEM &&
705 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
706 tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid);
707 if (tmprc)
708 cFYI(1, "cifs_sfu_type failed: %d", tmprc);
709 }
710
711#ifdef CONFIG_CIFS_ACL
712 /* fill in 0777 bits from ACL */
713 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
714 rc = cifs_acl_to_fattr(cifs_sb, &fattr, *pinode, full_path,
715 pfid);
716 if (rc) {
717 cFYI(1, "%s: Getting ACL failed with error: %d",
718 __func__, rc);
719 goto cgii_exit;
720 }
721 }
722#endif /* CONFIG_CIFS_ACL */
723
724 /* fill in remaining high mode bits e.g. SUID, VTX */
725 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
726 cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
727
728 /* check for Minshall+French symlinks */
729 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
730 tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
731 if (tmprc)
732 cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
733 }
734
735 if (!*pinode) {
736 *pinode = cifs_iget(sb, &fattr);
737 if (!*pinode)
738 rc = -ENOMEM;
739 } else {
740 cifs_fattr_to_inode(*pinode, &fattr);
741 }
742
743cgii_exit:
744 kfree(buf);
745 cifs_put_tlink(tlink);
746 return rc;
747}
748
749static const struct inode_operations cifs_ipc_inode_ops = {
750 .lookup = cifs_lookup,
751};
752
753char *cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
754 struct cifs_tcon *tcon)
755{
756 int pplen = vol->prepath ? strlen(vol->prepath) : 0;
757 int dfsplen;
758 char *full_path = NULL;
759
760 /* if no prefix path, simply set path to the root of share to "" */
761 if (pplen == 0) {
762 full_path = kmalloc(1, GFP_KERNEL);
763 if (full_path)
764 full_path[0] = 0;
765 return full_path;
766 }
767
768 if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
769 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
770 else
771 dfsplen = 0;
772
773 full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
774 if (full_path == NULL)
775 return full_path;
776
777 if (dfsplen)
778 strncpy(full_path, tcon->treeName, dfsplen);
779 strncpy(full_path + dfsplen, vol->prepath, pplen);
780 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
781 full_path[dfsplen + pplen] = 0; /* add trailing null */
782 return full_path;
783}
784
785static int
786cifs_find_inode(struct inode *inode, void *opaque)
787{
788 struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
789
790 /* don't match inode with different uniqueid */
791 if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
792 return 0;
793
794 /* use createtime like an i_generation field */
795 if (CIFS_I(inode)->createtime != fattr->cf_createtime)
796 return 0;
797
798 /* don't match inode of different type */
799 if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT))
800 return 0;
801
802 /* if it's not a directory or has no dentries, then flag it */
803 if (S_ISDIR(inode->i_mode) && !list_empty(&inode->i_dentry))
804 fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
805
806 return 1;
807}
808
809static int
810cifs_init_inode(struct inode *inode, void *opaque)
811{
812 struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
813
814 CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
815 CIFS_I(inode)->createtime = fattr->cf_createtime;
816 return 0;
817}
818
819/*
820 * walk dentry list for an inode and report whether it has aliases that
821 * are hashed. We use this to determine if a directory inode can actually
822 * be used.
823 */
824static bool
825inode_has_hashed_dentries(struct inode *inode)
826{
827 struct dentry *dentry;
828
829 spin_lock(&inode->i_lock);
830 list_for_each_entry(dentry, &inode->i_dentry, d_alias) {
831 if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
832 spin_unlock(&inode->i_lock);
833 return true;
834 }
835 }
836 spin_unlock(&inode->i_lock);
837 return false;
838}
839
840/* Given fattrs, get a corresponding inode */
841struct inode *
842cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
843{
844 unsigned long hash;
845 struct inode *inode;
846
847retry_iget5_locked:
848 cFYI(1, "looking for uniqueid=%llu", fattr->cf_uniqueid);
849
850 /* hash down to 32-bits on 32-bit arch */
851 hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
852
853 inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
854 if (inode) {
855 /* was there a potentially problematic inode collision? */
856 if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
857 fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
858
859 if (inode_has_hashed_dentries(inode)) {
860 cifs_autodisable_serverino(CIFS_SB(sb));
861 iput(inode);
862 fattr->cf_uniqueid = iunique(sb, ROOT_I);
863 goto retry_iget5_locked;
864 }
865 }
866
867 cifs_fattr_to_inode(inode, fattr);
868 if (sb->s_flags & MS_NOATIME)
869 inode->i_flags |= S_NOATIME | S_NOCMTIME;
870 if (inode->i_state & I_NEW) {
871 inode->i_ino = hash;
872 if (S_ISREG(inode->i_mode))
873 inode->i_data.backing_dev_info = sb->s_bdi;
874#ifdef CONFIG_CIFS_FSCACHE
875 /* initialize per-inode cache cookie pointer */
876 CIFS_I(inode)->fscache = NULL;
877#endif
878 unlock_new_inode(inode);
879 }
880 }
881
882 return inode;
883}
884
885/* gets root inode */
886struct inode *cifs_root_iget(struct super_block *sb)
887{
888 int xid;
889 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
890 struct inode *inode = NULL;
891 long rc;
892 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
893
894 xid = GetXid();
895 if (tcon->unix_ext)
896 rc = cifs_get_inode_info_unix(&inode, "", sb, xid);
897 else
898 rc = cifs_get_inode_info(&inode, "", NULL, sb, xid, NULL);
899
900 if (!inode) {
901 inode = ERR_PTR(rc);
902 goto out;
903 }
904
905#ifdef CONFIG_CIFS_FSCACHE
906 /* populate tcon->resource_id */
907 tcon->resource_id = CIFS_I(inode)->uniqueid;
908#endif
909
910 if (rc && tcon->ipc) {
911 cFYI(1, "ipc connection - fake read inode");
912 inode->i_mode |= S_IFDIR;
913 set_nlink(inode, 2);
914 inode->i_op = &cifs_ipc_inode_ops;
915 inode->i_fop = &simple_dir_operations;
916 inode->i_uid = cifs_sb->mnt_uid;
917 inode->i_gid = cifs_sb->mnt_gid;
918 } else if (rc) {
919 iget_failed(inode);
920 inode = ERR_PTR(rc);
921 }
922
923out:
924 /* can not call macro FreeXid here since in a void func
925 * TODO: This is no longer true
926 */
927 _FreeXid(xid);
928 return inode;
929}
930
931static int
932cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
933 char *full_path, __u32 dosattr)
934{
935 int rc;
936 int oplock = 0;
937 __u16 netfid;
938 __u32 netpid;
939 bool set_time = false;
940 struct cifsFileInfo *open_file;
941 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
942 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
943 struct tcon_link *tlink = NULL;
944 struct cifs_tcon *pTcon;
945 FILE_BASIC_INFO info_buf;
946
947 if (attrs == NULL)
948 return -EINVAL;
949
950 if (attrs->ia_valid & ATTR_ATIME) {
951 set_time = true;
952 info_buf.LastAccessTime =
953 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
954 } else
955 info_buf.LastAccessTime = 0;
956
957 if (attrs->ia_valid & ATTR_MTIME) {
958 set_time = true;
959 info_buf.LastWriteTime =
960 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
961 } else
962 info_buf.LastWriteTime = 0;
963
964 /*
965 * Samba throws this field away, but windows may actually use it.
966 * Do not set ctime unless other time stamps are changed explicitly
967 * (i.e. by utimes()) since we would then have a mix of client and
968 * server times.
969 */
970 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
971 cFYI(1, "CIFS - CTIME changed");
972 info_buf.ChangeTime =
973 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
974 } else
975 info_buf.ChangeTime = 0;
976
977 info_buf.CreationTime = 0; /* don't change */
978 info_buf.Attributes = cpu_to_le32(dosattr);
979
980 /*
981 * If the file is already open for write, just use that fileid
982 */
983 open_file = find_writable_file(cifsInode, true);
984 if (open_file) {
985 netfid = open_file->netfid;
986 netpid = open_file->pid;
987 pTcon = tlink_tcon(open_file->tlink);
988 goto set_via_filehandle;
989 }
990
991 tlink = cifs_sb_tlink(cifs_sb);
992 if (IS_ERR(tlink)) {
993 rc = PTR_ERR(tlink);
994 tlink = NULL;
995 goto out;
996 }
997 pTcon = tlink_tcon(tlink);
998
999 /*
1000 * NT4 apparently returns success on this call, but it doesn't
1001 * really work.
1002 */
1003 if (!(pTcon->ses->flags & CIFS_SES_NT4)) {
1004 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
1005 &info_buf, cifs_sb->local_nls,
1006 cifs_sb->mnt_cifs_flags &
1007 CIFS_MOUNT_MAP_SPECIAL_CHR);
1008 if (rc == 0) {
1009 cifsInode->cifsAttrs = dosattr;
1010 goto out;
1011 } else if (rc != -EOPNOTSUPP && rc != -EINVAL)
1012 goto out;
1013 }
1014
1015 cFYI(1, "calling SetFileInfo since SetPathInfo for "
1016 "times not supported by this server");
1017 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1018 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1019 CREATE_NOT_DIR, &netfid, &oplock,
1020 NULL, cifs_sb->local_nls,
1021 cifs_sb->mnt_cifs_flags &
1022 CIFS_MOUNT_MAP_SPECIAL_CHR);
1023
1024 if (rc != 0) {
1025 if (rc == -EIO)
1026 rc = -EINVAL;
1027 goto out;
1028 }
1029
1030 netpid = current->tgid;
1031
1032set_via_filehandle:
1033 rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
1034 if (!rc)
1035 cifsInode->cifsAttrs = dosattr;
1036
1037 if (open_file == NULL)
1038 CIFSSMBClose(xid, pTcon, netfid);
1039 else
1040 cifsFileInfo_put(open_file);
1041out:
1042 if (tlink != NULL)
1043 cifs_put_tlink(tlink);
1044 return rc;
1045}
1046
1047/*
1048 * open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
1049 * and rename it to a random name that hopefully won't conflict with
1050 * anything else.
1051 */
1052static int
1053cifs_rename_pending_delete(char *full_path, struct dentry *dentry, int xid)
1054{
1055 int oplock = 0;
1056 int rc;
1057 __u16 netfid;
1058 struct inode *inode = dentry->d_inode;
1059 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1060 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1061 struct tcon_link *tlink;
1062 struct cifs_tcon *tcon;
1063 __u32 dosattr, origattr;
1064 FILE_BASIC_INFO *info_buf = NULL;
1065
1066 tlink = cifs_sb_tlink(cifs_sb);
1067 if (IS_ERR(tlink))
1068 return PTR_ERR(tlink);
1069 tcon = tlink_tcon(tlink);
1070
1071 rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
1072 DELETE|FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
1073 &netfid, &oplock, NULL, cifs_sb->local_nls,
1074 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1075 if (rc != 0)
1076 goto out;
1077
1078 origattr = cifsInode->cifsAttrs;
1079 if (origattr == 0)
1080 origattr |= ATTR_NORMAL;
1081
1082 dosattr = origattr & ~ATTR_READONLY;
1083 if (dosattr == 0)
1084 dosattr |= ATTR_NORMAL;
1085 dosattr |= ATTR_HIDDEN;
1086
1087 /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
1088 if (dosattr != origattr) {
1089 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
1090 if (info_buf == NULL) {
1091 rc = -ENOMEM;
1092 goto out_close;
1093 }
1094 info_buf->Attributes = cpu_to_le32(dosattr);
1095 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
1096 current->tgid);
1097 /* although we would like to mark the file hidden
1098 if that fails we will still try to rename it */
1099 if (rc != 0)
1100 cifsInode->cifsAttrs = dosattr;
1101 else
1102 dosattr = origattr; /* since not able to change them */
1103 }
1104
1105 /* rename the file */
1106 rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
1107 cifs_sb->mnt_cifs_flags &
1108 CIFS_MOUNT_MAP_SPECIAL_CHR);
1109 if (rc != 0) {
1110 rc = -ETXTBSY;
1111 goto undo_setattr;
1112 }
1113
1114 /* try to set DELETE_ON_CLOSE */
1115 if (!cifsInode->delete_pending) {
1116 rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid,
1117 current->tgid);
1118 /*
1119 * some samba versions return -ENOENT when we try to set the
1120 * file disposition here. Likely a samba bug, but work around
1121 * it for now. This means that some cifsXXX files may hang
1122 * around after they shouldn't.
1123 *
1124 * BB: remove this hack after more servers have the fix
1125 */
1126 if (rc == -ENOENT)
1127 rc = 0;
1128 else if (rc != 0) {
1129 rc = -ETXTBSY;
1130 goto undo_rename;
1131 }
1132 cifsInode->delete_pending = true;
1133 }
1134
1135out_close:
1136 CIFSSMBClose(xid, tcon, netfid);
1137out:
1138 kfree(info_buf);
1139 cifs_put_tlink(tlink);
1140 return rc;
1141
1142 /*
1143 * reset everything back to the original state. Don't bother
1144 * dealing with errors here since we can't do anything about
1145 * them anyway.
1146 */
1147undo_rename:
1148 CIFSSMBRenameOpenFile(xid, tcon, netfid, dentry->d_name.name,
1149 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1150 CIFS_MOUNT_MAP_SPECIAL_CHR);
1151undo_setattr:
1152 if (dosattr != origattr) {
1153 info_buf->Attributes = cpu_to_le32(origattr);
1154 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
1155 current->tgid))
1156 cifsInode->cifsAttrs = origattr;
1157 }
1158
1159 goto out_close;
1160}
1161
1162
1163/*
1164 * If dentry->d_inode is null (usually meaning the cached dentry
1165 * is a negative dentry) then we would attempt a standard SMB delete, but
1166 * if that fails we can not attempt the fall back mechanisms on EACCESS
1167 * but will return the EACCESS to the caller. Note that the VFS does not call
1168 * unlink on negative dentries currently.
1169 */
1170int cifs_unlink(struct inode *dir, struct dentry *dentry)
1171{
1172 int rc = 0;
1173 int xid;
1174 char *full_path = NULL;
1175 struct inode *inode = dentry->d_inode;
1176 struct cifsInodeInfo *cifs_inode;
1177 struct super_block *sb = dir->i_sb;
1178 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1179 struct tcon_link *tlink;
1180 struct cifs_tcon *tcon;
1181 struct iattr *attrs = NULL;
1182 __u32 dosattr = 0, origattr = 0;
1183
1184 cFYI(1, "cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry);
1185
1186 tlink = cifs_sb_tlink(cifs_sb);
1187 if (IS_ERR(tlink))
1188 return PTR_ERR(tlink);
1189 tcon = tlink_tcon(tlink);
1190
1191 xid = GetXid();
1192
1193 /* Unlink can be called from rename so we can not take the
1194 * sb->s_vfs_rename_mutex here */
1195 full_path = build_path_from_dentry(dentry);
1196 if (full_path == NULL) {
1197 rc = -ENOMEM;
1198 goto unlink_out;
1199 }
1200
1201 if ((tcon->ses->capabilities & CAP_UNIX) &&
1202 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1203 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1204 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
1205 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
1206 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1207 cFYI(1, "posix del rc %d", rc);
1208 if ((rc == 0) || (rc == -ENOENT))
1209 goto psx_del_no_retry;
1210 }
1211
1212retry_std_delete:
1213 rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
1214 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1215
1216psx_del_no_retry:
1217 if (!rc) {
1218 if (inode)
1219 drop_nlink(inode);
1220 } else if (rc == -ENOENT) {
1221 d_drop(dentry);
1222 } else if (rc == -ETXTBSY) {
1223 rc = cifs_rename_pending_delete(full_path, dentry, xid);
1224 if (rc == 0)
1225 drop_nlink(inode);
1226 } else if ((rc == -EACCES) && (dosattr == 0) && inode) {
1227 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1228 if (attrs == NULL) {
1229 rc = -ENOMEM;
1230 goto out_reval;
1231 }
1232
1233 /* try to reset dos attributes */
1234 cifs_inode = CIFS_I(inode);
1235 origattr = cifs_inode->cifsAttrs;
1236 if (origattr == 0)
1237 origattr |= ATTR_NORMAL;
1238 dosattr = origattr & ~ATTR_READONLY;
1239 if (dosattr == 0)
1240 dosattr |= ATTR_NORMAL;
1241 dosattr |= ATTR_HIDDEN;
1242
1243 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1244 if (rc != 0)
1245 goto out_reval;
1246
1247 goto retry_std_delete;
1248 }
1249
1250 /* undo the setattr if we errored out and it's needed */
1251 if (rc != 0 && dosattr != 0)
1252 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
1253
1254out_reval:
1255 if (inode) {
1256 cifs_inode = CIFS_I(inode);
1257 cifs_inode->time = 0; /* will force revalidate to get info
1258 when needed */
1259 inode->i_ctime = current_fs_time(sb);
1260 }
1261 dir->i_ctime = dir->i_mtime = current_fs_time(sb);
1262 cifs_inode = CIFS_I(dir);
1263 CIFS_I(dir)->time = 0; /* force revalidate of dir as well */
1264unlink_out:
1265 kfree(full_path);
1266 kfree(attrs);
1267 FreeXid(xid);
1268 cifs_put_tlink(tlink);
1269 return rc;
1270}
1271
1272int cifs_mkdir(struct inode *inode, struct dentry *direntry, umode_t mode)
1273{
1274 int rc = 0, tmprc;
1275 int xid;
1276 struct cifs_sb_info *cifs_sb;
1277 struct tcon_link *tlink;
1278 struct cifs_tcon *pTcon;
1279 char *full_path = NULL;
1280 struct inode *newinode = NULL;
1281 struct cifs_fattr fattr;
1282
1283 cFYI(1, "In cifs_mkdir, mode = 0x%hx inode = 0x%p", mode, inode);
1284
1285 cifs_sb = CIFS_SB(inode->i_sb);
1286 tlink = cifs_sb_tlink(cifs_sb);
1287 if (IS_ERR(tlink))
1288 return PTR_ERR(tlink);
1289 pTcon = tlink_tcon(tlink);
1290
1291 xid = GetXid();
1292
1293 full_path = build_path_from_dentry(direntry);
1294 if (full_path == NULL) {
1295 rc = -ENOMEM;
1296 goto mkdir_out;
1297 }
1298
1299 if ((pTcon->ses->capabilities & CAP_UNIX) &&
1300 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1301 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
1302 u32 oplock = 0;
1303 FILE_UNIX_BASIC_INFO *pInfo =
1304 kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1305 if (pInfo == NULL) {
1306 rc = -ENOMEM;
1307 goto mkdir_out;
1308 }
1309
1310 mode &= ~current_umask();
1311 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
1312 mode, NULL /* netfid */, pInfo, &oplock,
1313 full_path, cifs_sb->local_nls,
1314 cifs_sb->mnt_cifs_flags &
1315 CIFS_MOUNT_MAP_SPECIAL_CHR);
1316 if (rc == -EOPNOTSUPP) {
1317 kfree(pInfo);
1318 goto mkdir_retry_old;
1319 } else if (rc) {
1320 cFYI(1, "posix mkdir returned 0x%x", rc);
1321 d_drop(direntry);
1322 } else {
1323 if (pInfo->Type == cpu_to_le32(-1)) {
1324 /* no return info, go query for it */
1325 kfree(pInfo);
1326 goto mkdir_get_info;
1327 }
1328/*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
1329 to set uid/gid */
1330
1331 cifs_unix_basic_to_fattr(&fattr, pInfo, cifs_sb);
1332 cifs_fill_uniqueid(inode->i_sb, &fattr);
1333 newinode = cifs_iget(inode->i_sb, &fattr);
1334 if (!newinode) {
1335 kfree(pInfo);
1336 goto mkdir_get_info;
1337 }
1338
1339 d_instantiate(direntry, newinode);
1340
1341#ifdef CONFIG_CIFS_DEBUG2
1342 cFYI(1, "instantiated dentry %p %s to inode %p",
1343 direntry, direntry->d_name.name, newinode);
1344
1345 if (newinode->i_nlink != 2)
1346 cFYI(1, "unexpected number of links %d",
1347 newinode->i_nlink);
1348#endif
1349 }
1350 kfree(pInfo);
1351 goto mkdir_out;
1352 }
1353mkdir_retry_old:
1354 /* BB add setting the equivalent of mode via CreateX w/ACLs */
1355 rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
1356 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1357 if (rc) {
1358 cFYI(1, "cifs_mkdir returned 0x%x", rc);
1359 d_drop(direntry);
1360 } else {
1361mkdir_get_info:
1362 if (pTcon->unix_ext)
1363 rc = cifs_get_inode_info_unix(&newinode, full_path,
1364 inode->i_sb, xid);
1365 else
1366 rc = cifs_get_inode_info(&newinode, full_path, NULL,
1367 inode->i_sb, xid, NULL);
1368
1369 d_instantiate(direntry, newinode);
1370 /* setting nlink not necessary except in cases where we
1371 * failed to get it from the server or was set bogus */
1372 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1373 set_nlink(direntry->d_inode, 2);
1374
1375 mode &= ~current_umask();
1376 /* must turn on setgid bit if parent dir has it */
1377 if (inode->i_mode & S_ISGID)
1378 mode |= S_ISGID;
1379
1380 if (pTcon->unix_ext) {
1381 struct cifs_unix_set_info_args args = {
1382 .mode = mode,
1383 .ctime = NO_CHANGE_64,
1384 .atime = NO_CHANGE_64,
1385 .mtime = NO_CHANGE_64,
1386 .device = 0,
1387 };
1388 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1389 args.uid = (__u64)current_fsuid();
1390 if (inode->i_mode & S_ISGID)
1391 args.gid = (__u64)inode->i_gid;
1392 else
1393 args.gid = (__u64)current_fsgid();
1394 } else {
1395 args.uid = NO_CHANGE_64;
1396 args.gid = NO_CHANGE_64;
1397 }
1398 CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
1399 cifs_sb->local_nls,
1400 cifs_sb->mnt_cifs_flags &
1401 CIFS_MOUNT_MAP_SPECIAL_CHR);
1402 } else {
1403 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1404 (mode & S_IWUGO) == 0) {
1405 FILE_BASIC_INFO pInfo;
1406 struct cifsInodeInfo *cifsInode;
1407 u32 dosattrs;
1408
1409 memset(&pInfo, 0, sizeof(pInfo));
1410 cifsInode = CIFS_I(newinode);
1411 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
1412 pInfo.Attributes = cpu_to_le32(dosattrs);
1413 tmprc = CIFSSMBSetPathInfo(xid, pTcon,
1414 full_path, &pInfo,
1415 cifs_sb->local_nls,
1416 cifs_sb->mnt_cifs_flags &
1417 CIFS_MOUNT_MAP_SPECIAL_CHR);
1418 if (tmprc == 0)
1419 cifsInode->cifsAttrs = dosattrs;
1420 }
1421 if (direntry->d_inode) {
1422 if (cifs_sb->mnt_cifs_flags &
1423 CIFS_MOUNT_DYNPERM)
1424 direntry->d_inode->i_mode =
1425 (mode | S_IFDIR);
1426
1427 if (cifs_sb->mnt_cifs_flags &
1428 CIFS_MOUNT_SET_UID) {
1429 direntry->d_inode->i_uid =
1430 current_fsuid();
1431 if (inode->i_mode & S_ISGID)
1432 direntry->d_inode->i_gid =
1433 inode->i_gid;
1434 else
1435 direntry->d_inode->i_gid =
1436 current_fsgid();
1437 }
1438 }
1439 }
1440 }
1441mkdir_out:
1442 /*
1443 * Force revalidate to get parent dir info when needed since cached
1444 * attributes are invalid now.
1445 */
1446 CIFS_I(inode)->time = 0;
1447 kfree(full_path);
1448 FreeXid(xid);
1449 cifs_put_tlink(tlink);
1450 return rc;
1451}
1452
1453int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1454{
1455 int rc = 0;
1456 int xid;
1457 struct cifs_sb_info *cifs_sb;
1458 struct tcon_link *tlink;
1459 struct cifs_tcon *pTcon;
1460 char *full_path = NULL;
1461 struct cifsInodeInfo *cifsInode;
1462
1463 cFYI(1, "cifs_rmdir, inode = 0x%p", inode);
1464
1465 xid = GetXid();
1466
1467 full_path = build_path_from_dentry(direntry);
1468 if (full_path == NULL) {
1469 rc = -ENOMEM;
1470 goto rmdir_exit;
1471 }
1472
1473 cifs_sb = CIFS_SB(inode->i_sb);
1474 tlink = cifs_sb_tlink(cifs_sb);
1475 if (IS_ERR(tlink)) {
1476 rc = PTR_ERR(tlink);
1477 goto rmdir_exit;
1478 }
1479 pTcon = tlink_tcon(tlink);
1480
1481 rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1482 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1483 cifs_put_tlink(tlink);
1484
1485 if (!rc) {
1486 spin_lock(&direntry->d_inode->i_lock);
1487 i_size_write(direntry->d_inode, 0);
1488 clear_nlink(direntry->d_inode);
1489 spin_unlock(&direntry->d_inode->i_lock);
1490 }
1491
1492 cifsInode = CIFS_I(direntry->d_inode);
1493 /* force revalidate to go get info when needed */
1494 cifsInode->time = 0;
1495
1496 cifsInode = CIFS_I(inode);
1497 /*
1498 * Force revalidate to get parent dir info when needed since cached
1499 * attributes are invalid now.
1500 */
1501 cifsInode->time = 0;
1502
1503 direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1504 current_fs_time(inode->i_sb);
1505
1506rmdir_exit:
1507 kfree(full_path);
1508 FreeXid(xid);
1509 return rc;
1510}
1511
1512static int
1513cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
1514 struct dentry *to_dentry, const char *toPath)
1515{
1516 struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1517 struct tcon_link *tlink;
1518 struct cifs_tcon *pTcon;
1519 __u16 srcfid;
1520 int oplock, rc;
1521
1522 tlink = cifs_sb_tlink(cifs_sb);
1523 if (IS_ERR(tlink))
1524 return PTR_ERR(tlink);
1525 pTcon = tlink_tcon(tlink);
1526
1527 /* try path-based rename first */
1528 rc = CIFSSMBRename(xid, pTcon, fromPath, toPath, cifs_sb->local_nls,
1529 cifs_sb->mnt_cifs_flags &
1530 CIFS_MOUNT_MAP_SPECIAL_CHR);
1531
1532 /*
1533 * don't bother with rename by filehandle unless file is busy and
1534 * source Note that cross directory moves do not work with
1535 * rename by filehandle to various Windows servers.
1536 */
1537 if (rc == 0 || rc != -ETXTBSY)
1538 goto do_rename_exit;
1539
1540 /* open-file renames don't work across directories */
1541 if (to_dentry->d_parent != from_dentry->d_parent)
1542 goto do_rename_exit;
1543
1544 /* open the file to be renamed -- we need DELETE perms */
1545 rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
1546 CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1547 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1548 CIFS_MOUNT_MAP_SPECIAL_CHR);
1549
1550 if (rc == 0) {
1551 rc = CIFSSMBRenameOpenFile(xid, pTcon, srcfid,
1552 (const char *) to_dentry->d_name.name,
1553 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1554 CIFS_MOUNT_MAP_SPECIAL_CHR);
1555
1556 CIFSSMBClose(xid, pTcon, srcfid);
1557 }
1558do_rename_exit:
1559 cifs_put_tlink(tlink);
1560 return rc;
1561}
1562
1563int cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
1564 struct inode *target_dir, struct dentry *target_dentry)
1565{
1566 char *fromName = NULL;
1567 char *toName = NULL;
1568 struct cifs_sb_info *cifs_sb;
1569 struct tcon_link *tlink;
1570 struct cifs_tcon *tcon;
1571 FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1572 FILE_UNIX_BASIC_INFO *info_buf_target;
1573 int xid, rc, tmprc;
1574
1575 cifs_sb = CIFS_SB(source_dir->i_sb);
1576 tlink = cifs_sb_tlink(cifs_sb);
1577 if (IS_ERR(tlink))
1578 return PTR_ERR(tlink);
1579 tcon = tlink_tcon(tlink);
1580
1581 xid = GetXid();
1582
1583 /*
1584 * we already have the rename sem so we do not need to
1585 * grab it again here to protect the path integrity
1586 */
1587 fromName = build_path_from_dentry(source_dentry);
1588 if (fromName == NULL) {
1589 rc = -ENOMEM;
1590 goto cifs_rename_exit;
1591 }
1592
1593 toName = build_path_from_dentry(target_dentry);
1594 if (toName == NULL) {
1595 rc = -ENOMEM;
1596 goto cifs_rename_exit;
1597 }
1598
1599 rc = cifs_do_rename(xid, source_dentry, fromName,
1600 target_dentry, toName);
1601
1602 if (rc == -EEXIST && tcon->unix_ext) {
1603 /*
1604 * Are src and dst hardlinks of same inode? We can
1605 * only tell with unix extensions enabled
1606 */
1607 info_buf_source =
1608 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1609 GFP_KERNEL);
1610 if (info_buf_source == NULL) {
1611 rc = -ENOMEM;
1612 goto cifs_rename_exit;
1613 }
1614
1615 info_buf_target = info_buf_source + 1;
1616 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, fromName,
1617 info_buf_source,
1618 cifs_sb->local_nls,
1619 cifs_sb->mnt_cifs_flags &
1620 CIFS_MOUNT_MAP_SPECIAL_CHR);
1621 if (tmprc != 0)
1622 goto unlink_target;
1623
1624 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, toName,
1625 info_buf_target,
1626 cifs_sb->local_nls,
1627 cifs_sb->mnt_cifs_flags &
1628 CIFS_MOUNT_MAP_SPECIAL_CHR);
1629
1630 if (tmprc == 0 && (info_buf_source->UniqueId ==
1631 info_buf_target->UniqueId)) {
1632 /* same file, POSIX says that this is a noop */
1633 rc = 0;
1634 goto cifs_rename_exit;
1635 }
1636 } /* else ... BB we could add the same check for Windows by
1637 checking the UniqueId via FILE_INTERNAL_INFO */
1638
1639unlink_target:
1640 /* Try unlinking the target dentry if it's not negative */
1641 if (target_dentry->d_inode && (rc == -EACCES || rc == -EEXIST)) {
1642 tmprc = cifs_unlink(target_dir, target_dentry);
1643 if (tmprc)
1644 goto cifs_rename_exit;
1645
1646 rc = cifs_do_rename(xid, source_dentry, fromName,
1647 target_dentry, toName);
1648 }
1649
1650cifs_rename_exit:
1651 kfree(info_buf_source);
1652 kfree(fromName);
1653 kfree(toName);
1654 FreeXid(xid);
1655 cifs_put_tlink(tlink);
1656 return rc;
1657}
1658
1659static bool
1660cifs_inode_needs_reval(struct inode *inode)
1661{
1662 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1663 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1664
1665 if (cifs_i->clientCanCacheRead)
1666 return false;
1667
1668 if (!lookupCacheEnabled)
1669 return true;
1670
1671 if (cifs_i->time == 0)
1672 return true;
1673
1674 if (!time_in_range(jiffies, cifs_i->time,
1675 cifs_i->time + cifs_sb->actimeo))
1676 return true;
1677
1678 /* hardlinked files w/ noserverino get "special" treatment */
1679 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
1680 S_ISREG(inode->i_mode) && inode->i_nlink != 1)
1681 return true;
1682
1683 return false;
1684}
1685
1686/*
1687 * Zap the cache. Called when invalid_mapping flag is set.
1688 */
1689int
1690cifs_invalidate_mapping(struct inode *inode)
1691{
1692 int rc = 0;
1693 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1694
1695 cifs_i->invalid_mapping = false;
1696
1697 if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
1698 rc = invalidate_inode_pages2(inode->i_mapping);
1699 if (rc) {
1700 cERROR(1, "%s: could not invalidate inode %p", __func__,
1701 inode);
1702 cifs_i->invalid_mapping = true;
1703 }
1704 }
1705
1706 cifs_fscache_reset_inode_cookie(inode);
1707 return rc;
1708}
1709
1710int cifs_revalidate_file_attr(struct file *filp)
1711{
1712 int rc = 0;
1713 struct inode *inode = filp->f_path.dentry->d_inode;
1714 struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
1715
1716 if (!cifs_inode_needs_reval(inode))
1717 return rc;
1718
1719 if (tlink_tcon(cfile->tlink)->unix_ext)
1720 rc = cifs_get_file_info_unix(filp);
1721 else
1722 rc = cifs_get_file_info(filp);
1723
1724 return rc;
1725}
1726
1727int cifs_revalidate_dentry_attr(struct dentry *dentry)
1728{
1729 int xid;
1730 int rc = 0;
1731 struct inode *inode = dentry->d_inode;
1732 struct super_block *sb = dentry->d_sb;
1733 char *full_path = NULL;
1734
1735 if (inode == NULL)
1736 return -ENOENT;
1737
1738 if (!cifs_inode_needs_reval(inode))
1739 return rc;
1740
1741 xid = GetXid();
1742
1743 /* can not safely grab the rename sem here if rename calls revalidate
1744 since that would deadlock */
1745 full_path = build_path_from_dentry(dentry);
1746 if (full_path == NULL) {
1747 rc = -ENOMEM;
1748 goto out;
1749 }
1750
1751 cFYI(1, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time "
1752 "%ld jiffies %ld", full_path, inode, inode->i_count.counter,
1753 dentry, dentry->d_time, jiffies);
1754
1755 if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
1756 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
1757 else
1758 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
1759 xid, NULL);
1760
1761out:
1762 kfree(full_path);
1763 FreeXid(xid);
1764 return rc;
1765}
1766
1767int cifs_revalidate_file(struct file *filp)
1768{
1769 int rc;
1770 struct inode *inode = filp->f_path.dentry->d_inode;
1771
1772 rc = cifs_revalidate_file_attr(filp);
1773 if (rc)
1774 return rc;
1775
1776 if (CIFS_I(inode)->invalid_mapping)
1777 rc = cifs_invalidate_mapping(inode);
1778 return rc;
1779}
1780
1781/* revalidate a dentry's inode attributes */
1782int cifs_revalidate_dentry(struct dentry *dentry)
1783{
1784 int rc;
1785 struct inode *inode = dentry->d_inode;
1786
1787 rc = cifs_revalidate_dentry_attr(dentry);
1788 if (rc)
1789 return rc;
1790
1791 if (CIFS_I(inode)->invalid_mapping)
1792 rc = cifs_invalidate_mapping(inode);
1793 return rc;
1794}
1795
1796int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1797 struct kstat *stat)
1798{
1799 struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
1800 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
1801 struct inode *inode = dentry->d_inode;
1802 int rc;
1803
1804 /*
1805 * We need to be sure that all dirty pages are written and the server
1806 * has actual ctime, mtime and file length.
1807 */
1808 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
1809 inode->i_mapping->nrpages != 0) {
1810 rc = filemap_fdatawait(inode->i_mapping);
1811 if (rc) {
1812 mapping_set_error(inode->i_mapping, rc);
1813 return rc;
1814 }
1815 }
1816
1817 rc = cifs_revalidate_dentry_attr(dentry);
1818 if (rc)
1819 return rc;
1820
1821 generic_fillattr(inode, stat);
1822 stat->blksize = CIFS_MAX_MSGSIZE;
1823 stat->ino = CIFS_I(inode)->uniqueid;
1824
1825 /*
1826 * If on a multiuser mount without unix extensions, and the admin hasn't
1827 * overridden them, set the ownership to the fsuid/fsgid of the current
1828 * process.
1829 */
1830 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
1831 !tcon->unix_ext) {
1832 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
1833 stat->uid = current_fsuid();
1834 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
1835 stat->gid = current_fsgid();
1836 }
1837 return rc;
1838}
1839
1840static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1841{
1842 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1843 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1844 struct page *page;
1845 int rc = 0;
1846
1847 page = grab_cache_page(mapping, index);
1848 if (!page)
1849 return -ENOMEM;
1850
1851 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1852 unlock_page(page);
1853 page_cache_release(page);
1854 return rc;
1855}
1856
1857static void cifs_setsize(struct inode *inode, loff_t offset)
1858{
1859 loff_t oldsize;
1860
1861 spin_lock(&inode->i_lock);
1862 oldsize = inode->i_size;
1863 i_size_write(inode, offset);
1864 spin_unlock(&inode->i_lock);
1865
1866 truncate_pagecache(inode, oldsize, offset);
1867}
1868
1869static int
1870cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1871 int xid, char *full_path)
1872{
1873 int rc;
1874 struct cifsFileInfo *open_file;
1875 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1876 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1877 struct tcon_link *tlink = NULL;
1878 struct cifs_tcon *pTcon = NULL;
1879 struct cifs_io_parms io_parms;
1880
1881 /*
1882 * To avoid spurious oplock breaks from server, in the case of
1883 * inodes that we already have open, avoid doing path based
1884 * setting of file size if we can do it by handle.
1885 * This keeps our caching token (oplock) and avoids timeouts
1886 * when the local oplock break takes longer to flush
1887 * writebehind data than the SMB timeout for the SetPathInfo
1888 * request would allow
1889 */
1890 open_file = find_writable_file(cifsInode, true);
1891 if (open_file) {
1892 __u16 nfid = open_file->netfid;
1893 __u32 npid = open_file->pid;
1894 pTcon = tlink_tcon(open_file->tlink);
1895 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1896 npid, false);
1897 cifsFileInfo_put(open_file);
1898 cFYI(1, "SetFSize for attrs rc = %d", rc);
1899 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1900 unsigned int bytes_written;
1901
1902 io_parms.netfid = nfid;
1903 io_parms.pid = npid;
1904 io_parms.tcon = pTcon;
1905 io_parms.offset = 0;
1906 io_parms.length = attrs->ia_size;
1907 rc = CIFSSMBWrite(xid, &io_parms, &bytes_written,
1908 NULL, NULL, 1);
1909 cFYI(1, "Wrt seteof rc %d", rc);
1910 }
1911 } else
1912 rc = -EINVAL;
1913
1914 if (rc != 0) {
1915 if (pTcon == NULL) {
1916 tlink = cifs_sb_tlink(cifs_sb);
1917 if (IS_ERR(tlink))
1918 return PTR_ERR(tlink);
1919 pTcon = tlink_tcon(tlink);
1920 }
1921
1922 /* Set file size by pathname rather than by handle
1923 either because no valid, writeable file handle for
1924 it was found or because there was an error setting
1925 it by handle */
1926 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1927 false, cifs_sb->local_nls,
1928 cifs_sb->mnt_cifs_flags &
1929 CIFS_MOUNT_MAP_SPECIAL_CHR);
1930 cFYI(1, "SetEOF by path (setattrs) rc = %d", rc);
1931 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1932 __u16 netfid;
1933 int oplock = 0;
1934
1935 rc = SMBLegacyOpen(xid, pTcon, full_path,
1936 FILE_OPEN, GENERIC_WRITE,
1937 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1938 cifs_sb->local_nls,
1939 cifs_sb->mnt_cifs_flags &
1940 CIFS_MOUNT_MAP_SPECIAL_CHR);
1941 if (rc == 0) {
1942 unsigned int bytes_written;
1943
1944 io_parms.netfid = netfid;
1945 io_parms.pid = current->tgid;
1946 io_parms.tcon = pTcon;
1947 io_parms.offset = 0;
1948 io_parms.length = attrs->ia_size;
1949 rc = CIFSSMBWrite(xid, &io_parms,
1950 &bytes_written,
1951 NULL, NULL, 1);
1952 cFYI(1, "wrt seteof rc %d", rc);
1953 CIFSSMBClose(xid, pTcon, netfid);
1954 }
1955 }
1956 if (tlink)
1957 cifs_put_tlink(tlink);
1958 }
1959
1960 if (rc == 0) {
1961 cifsInode->server_eof = attrs->ia_size;
1962 cifs_setsize(inode, attrs->ia_size);
1963 cifs_truncate_page(inode->i_mapping, inode->i_size);
1964 }
1965
1966 return rc;
1967}
1968
1969static int
1970cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1971{
1972 int rc;
1973 int xid;
1974 char *full_path = NULL;
1975 struct inode *inode = direntry->d_inode;
1976 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1977 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1978 struct tcon_link *tlink;
1979 struct cifs_tcon *pTcon;
1980 struct cifs_unix_set_info_args *args = NULL;
1981 struct cifsFileInfo *open_file;
1982
1983 cFYI(1, "setattr_unix on file %s attrs->ia_valid=0x%x",
1984 direntry->d_name.name, attrs->ia_valid);
1985
1986 xid = GetXid();
1987
1988 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
1989 attrs->ia_valid |= ATTR_FORCE;
1990
1991 rc = inode_change_ok(inode, attrs);
1992 if (rc < 0)
1993 goto out;
1994
1995 full_path = build_path_from_dentry(direntry);
1996 if (full_path == NULL) {
1997 rc = -ENOMEM;
1998 goto out;
1999 }
2000
2001 /*
2002 * Attempt to flush data before changing attributes. We need to do
2003 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2004 * ownership or mode then we may also need to do this. Here, we take
2005 * the safe way out and just do the flush on all setattr requests. If
2006 * the flush returns error, store it to report later and continue.
2007 *
2008 * BB: This should be smarter. Why bother flushing pages that
2009 * will be truncated anyway? Also, should we error out here if
2010 * the flush returns error?
2011 */
2012 rc = filemap_write_and_wait(inode->i_mapping);
2013 mapping_set_error(inode->i_mapping, rc);
2014 rc = 0;
2015
2016 if (attrs->ia_valid & ATTR_SIZE) {
2017 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2018 if (rc != 0)
2019 goto out;
2020 }
2021
2022 /* skip mode change if it's just for clearing setuid/setgid */
2023 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2024 attrs->ia_valid &= ~ATTR_MODE;
2025
2026 args = kmalloc(sizeof(*args), GFP_KERNEL);
2027 if (args == NULL) {
2028 rc = -ENOMEM;
2029 goto out;
2030 }
2031
2032 /* set up the struct */
2033 if (attrs->ia_valid & ATTR_MODE)
2034 args->mode = attrs->ia_mode;
2035 else
2036 args->mode = NO_CHANGE_64;
2037
2038 if (attrs->ia_valid & ATTR_UID)
2039 args->uid = attrs->ia_uid;
2040 else
2041 args->uid = NO_CHANGE_64;
2042
2043 if (attrs->ia_valid & ATTR_GID)
2044 args->gid = attrs->ia_gid;
2045 else
2046 args->gid = NO_CHANGE_64;
2047
2048 if (attrs->ia_valid & ATTR_ATIME)
2049 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
2050 else
2051 args->atime = NO_CHANGE_64;
2052
2053 if (attrs->ia_valid & ATTR_MTIME)
2054 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
2055 else
2056 args->mtime = NO_CHANGE_64;
2057
2058 if (attrs->ia_valid & ATTR_CTIME)
2059 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
2060 else
2061 args->ctime = NO_CHANGE_64;
2062
2063 args->device = 0;
2064 open_file = find_writable_file(cifsInode, true);
2065 if (open_file) {
2066 u16 nfid = open_file->netfid;
2067 u32 npid = open_file->pid;
2068 pTcon = tlink_tcon(open_file->tlink);
2069 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
2070 cifsFileInfo_put(open_file);
2071 } else {
2072 tlink = cifs_sb_tlink(cifs_sb);
2073 if (IS_ERR(tlink)) {
2074 rc = PTR_ERR(tlink);
2075 goto out;
2076 }
2077 pTcon = tlink_tcon(tlink);
2078 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
2079 cifs_sb->local_nls,
2080 cifs_sb->mnt_cifs_flags &
2081 CIFS_MOUNT_MAP_SPECIAL_CHR);
2082 cifs_put_tlink(tlink);
2083 }
2084
2085 if (rc)
2086 goto out;
2087
2088 if ((attrs->ia_valid & ATTR_SIZE) &&
2089 attrs->ia_size != i_size_read(inode))
2090 truncate_setsize(inode, attrs->ia_size);
2091
2092 setattr_copy(inode, attrs);
2093 mark_inode_dirty(inode);
2094
2095 /* force revalidate when any of these times are set since some
2096 of the fs types (eg ext3, fat) do not have fine enough
2097 time granularity to match protocol, and we do not have a
2098 a way (yet) to query the server fs's time granularity (and
2099 whether it rounds times down).
2100 */
2101 if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
2102 cifsInode->time = 0;
2103out:
2104 kfree(args);
2105 kfree(full_path);
2106 FreeXid(xid);
2107 return rc;
2108}
2109
2110static int
2111cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
2112{
2113 int xid;
2114 uid_t uid = NO_CHANGE_32;
2115 gid_t gid = NO_CHANGE_32;
2116 struct inode *inode = direntry->d_inode;
2117 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2118 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2119 char *full_path = NULL;
2120 int rc = -EACCES;
2121 __u32 dosattr = 0;
2122 __u64 mode = NO_CHANGE_64;
2123
2124 xid = GetXid();
2125
2126 cFYI(1, "setattr on file %s attrs->iavalid 0x%x",
2127 direntry->d_name.name, attrs->ia_valid);
2128
2129 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2130 attrs->ia_valid |= ATTR_FORCE;
2131
2132 rc = inode_change_ok(inode, attrs);
2133 if (rc < 0) {
2134 FreeXid(xid);
2135 return rc;
2136 }
2137
2138 full_path = build_path_from_dentry(direntry);
2139 if (full_path == NULL) {
2140 rc = -ENOMEM;
2141 FreeXid(xid);
2142 return rc;
2143 }
2144
2145 /*
2146 * Attempt to flush data before changing attributes. We need to do
2147 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2148 * ownership or mode then we may also need to do this. Here, we take
2149 * the safe way out and just do the flush on all setattr requests. If
2150 * the flush returns error, store it to report later and continue.
2151 *
2152 * BB: This should be smarter. Why bother flushing pages that
2153 * will be truncated anyway? Also, should we error out here if
2154 * the flush returns error?
2155 */
2156 rc = filemap_write_and_wait(inode->i_mapping);
2157 mapping_set_error(inode->i_mapping, rc);
2158 rc = 0;
2159
2160 if (attrs->ia_valid & ATTR_SIZE) {
2161 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2162 if (rc != 0)
2163 goto cifs_setattr_exit;
2164 }
2165
2166 if (attrs->ia_valid & ATTR_UID)
2167 uid = attrs->ia_uid;
2168
2169 if (attrs->ia_valid & ATTR_GID)
2170 gid = attrs->ia_gid;
2171
2172#ifdef CONFIG_CIFS_ACL
2173 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2174 if (uid != NO_CHANGE_32 || gid != NO_CHANGE_32) {
2175 rc = id_mode_to_cifs_acl(inode, full_path, NO_CHANGE_64,
2176 uid, gid);
2177 if (rc) {
2178 cFYI(1, "%s: Setting id failed with error: %d",
2179 __func__, rc);
2180 goto cifs_setattr_exit;
2181 }
2182 }
2183 } else
2184#endif /* CONFIG_CIFS_ACL */
2185 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
2186 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
2187
2188 /* skip mode change if it's just for clearing setuid/setgid */
2189 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2190 attrs->ia_valid &= ~ATTR_MODE;
2191
2192 if (attrs->ia_valid & ATTR_MODE) {
2193 mode = attrs->ia_mode;
2194 rc = 0;
2195#ifdef CONFIG_CIFS_ACL
2196 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2197 rc = id_mode_to_cifs_acl(inode, full_path, mode,
2198 NO_CHANGE_32, NO_CHANGE_32);
2199 if (rc) {
2200 cFYI(1, "%s: Setting ACL failed with error: %d",
2201 __func__, rc);
2202 goto cifs_setattr_exit;
2203 }
2204 } else
2205#endif /* CONFIG_CIFS_ACL */
2206 if (((mode & S_IWUGO) == 0) &&
2207 (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
2208
2209 dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
2210
2211 /* fix up mode if we're not using dynperm */
2212 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
2213 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
2214 } else if ((mode & S_IWUGO) &&
2215 (cifsInode->cifsAttrs & ATTR_READONLY)) {
2216
2217 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
2218 /* Attributes of 0 are ignored */
2219 if (dosattr == 0)
2220 dosattr |= ATTR_NORMAL;
2221
2222 /* reset local inode permissions to normal */
2223 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2224 attrs->ia_mode &= ~(S_IALLUGO);
2225 if (S_ISDIR(inode->i_mode))
2226 attrs->ia_mode |=
2227 cifs_sb->mnt_dir_mode;
2228 else
2229 attrs->ia_mode |=
2230 cifs_sb->mnt_file_mode;
2231 }
2232 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2233 /* ignore mode change - ATTR_READONLY hasn't changed */
2234 attrs->ia_valid &= ~ATTR_MODE;
2235 }
2236 }
2237
2238 if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
2239 ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
2240 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
2241 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
2242
2243 /* Even if error on time set, no sense failing the call if
2244 the server would set the time to a reasonable value anyway,
2245 and this check ensures that we are not being called from
2246 sys_utimes in which case we ought to fail the call back to
2247 the user when the server rejects the call */
2248 if ((rc) && (attrs->ia_valid &
2249 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
2250 rc = 0;
2251 }
2252
2253 /* do not need local check to inode_check_ok since the server does
2254 that */
2255 if (rc)
2256 goto cifs_setattr_exit;
2257
2258 if ((attrs->ia_valid & ATTR_SIZE) &&
2259 attrs->ia_size != i_size_read(inode))
2260 truncate_setsize(inode, attrs->ia_size);
2261
2262 setattr_copy(inode, attrs);
2263 mark_inode_dirty(inode);
2264
2265cifs_setattr_exit:
2266 kfree(full_path);
2267 FreeXid(xid);
2268 return rc;
2269}
2270
2271int
2272cifs_setattr(struct dentry *direntry, struct iattr *attrs)
2273{
2274 struct inode *inode = direntry->d_inode;
2275 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2276 struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
2277
2278 if (pTcon->unix_ext)
2279 return cifs_setattr_unix(direntry, attrs);
2280
2281 return cifs_setattr_nounix(direntry, attrs);
2282
2283 /* BB: add cifs_setattr_legacy for really old servers */
2284}
2285
2286#if 0
2287void cifs_delete_inode(struct inode *inode)
2288{
2289 cFYI(1, "In cifs_delete_inode, inode = 0x%p", inode);
2290 /* may have to add back in if and when safe distributed caching of
2291 directories added e.g. via FindNotify */
2292}
2293#endif