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