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 #include "reparse.h"
30
31 /*
32 * Set parameters for the netfs library
33 */
cifs_set_netfs_context(struct inode * inode)34 static void cifs_set_netfs_context(struct inode *inode)
35 {
36 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
37
38 netfs_inode_init(&cifs_i->netfs, &cifs_req_ops, true);
39 }
40
cifs_set_ops(struct inode * inode)41 static void cifs_set_ops(struct inode *inode)
42 {
43 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
44 struct netfs_inode *ictx = netfs_inode(inode);
45
46 switch (inode->i_mode & S_IFMT) {
47 case S_IFREG:
48 inode->i_op = &cifs_file_inode_ops;
49 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
50 set_bit(NETFS_ICTX_UNBUFFERED, &ictx->flags);
51 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
52 inode->i_fop = &cifs_file_direct_nobrl_ops;
53 else
54 inode->i_fop = &cifs_file_direct_ops;
55 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
56 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
57 inode->i_fop = &cifs_file_strict_nobrl_ops;
58 else
59 inode->i_fop = &cifs_file_strict_ops;
60 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
61 inode->i_fop = &cifs_file_nobrl_ops;
62 else { /* not direct, send byte range locks */
63 inode->i_fop = &cifs_file_ops;
64 }
65
66 /* check if server can support readahead */
67 if (cifs_sb_master_tcon(cifs_sb)->ses->server->max_read <
68 PAGE_SIZE + MAX_CIFS_HDR_SIZE)
69 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
70 else
71 inode->i_data.a_ops = &cifs_addr_ops;
72 mapping_set_large_folios(inode->i_mapping);
73 break;
74 case S_IFDIR:
75 if (IS_AUTOMOUNT(inode)) {
76 inode->i_op = &cifs_namespace_inode_operations;
77 } else {
78 inode->i_op = &cifs_dir_inode_ops;
79 inode->i_fop = &cifs_dir_ops;
80 }
81 break;
82 case S_IFLNK:
83 inode->i_op = &cifs_symlink_inode_ops;
84 break;
85 default:
86 init_special_inode(inode, inode->i_mode, inode->i_rdev);
87 break;
88 }
89 }
90
91 /* check inode attributes against fattr. If they don't match, tag the
92 * inode for cache invalidation
93 */
94 static void
cifs_revalidate_cache(struct inode * inode,struct cifs_fattr * fattr)95 cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
96 {
97 struct cifs_fscache_inode_coherency_data cd;
98 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
99 struct timespec64 mtime;
100
101 cifs_dbg(FYI, "%s: revalidating inode %llu\n",
102 __func__, cifs_i->uniqueid);
103
104 if (inode->i_state & I_NEW) {
105 cifs_dbg(FYI, "%s: inode %llu is new\n",
106 __func__, cifs_i->uniqueid);
107 return;
108 }
109
110 /* don't bother with revalidation if we have an oplock */
111 if (CIFS_CACHE_READ(cifs_i)) {
112 cifs_dbg(FYI, "%s: inode %llu is oplocked\n",
113 __func__, cifs_i->uniqueid);
114 return;
115 }
116
117 /* revalidate if mtime or size have changed */
118 fattr->cf_mtime = timestamp_truncate(fattr->cf_mtime, inode);
119 mtime = inode_get_mtime(inode);
120 if (timespec64_equal(&mtime, &fattr->cf_mtime) &&
121 cifs_i->netfs.remote_i_size == fattr->cf_eof) {
122 cifs_dbg(FYI, "%s: inode %llu is unchanged\n",
123 __func__, cifs_i->uniqueid);
124 return;
125 }
126
127 cifs_dbg(FYI, "%s: invalidating inode %llu mapping\n",
128 __func__, cifs_i->uniqueid);
129 set_bit(CIFS_INO_INVALID_MAPPING, &cifs_i->flags);
130 /* Invalidate fscache cookie */
131 cifs_fscache_fill_coherency(&cifs_i->netfs.inode, &cd);
132 fscache_invalidate(cifs_inode_cookie(inode), &cd, i_size_read(inode), 0);
133 }
134
135 /*
136 * copy nlink to the inode, unless it wasn't provided. Provide
137 * sane values if we don't have an existing one and none was provided
138 */
139 static void
cifs_nlink_fattr_to_inode(struct inode * inode,struct cifs_fattr * fattr)140 cifs_nlink_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
141 {
142 /*
143 * if we're in a situation where we can't trust what we
144 * got from the server (readdir, some non-unix cases)
145 * fake reasonable values
146 */
147 if (fattr->cf_flags & CIFS_FATTR_UNKNOWN_NLINK) {
148 /* only provide fake values on a new inode */
149 if (inode->i_state & I_NEW) {
150 if (fattr->cf_cifsattrs & ATTR_DIRECTORY)
151 set_nlink(inode, 2);
152 else
153 set_nlink(inode, 1);
154 }
155 return;
156 }
157
158 /* we trust the server, so update it */
159 set_nlink(inode, fattr->cf_nlink);
160 }
161
162 /* populate an inode with info from a cifs_fattr struct */
163 int
cifs_fattr_to_inode(struct inode * inode,struct cifs_fattr * fattr,bool from_readdir)164 cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr,
165 bool from_readdir)
166 {
167 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
168 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
169
170 if (!(inode->i_state & I_NEW) &&
171 unlikely(inode_wrong_type(inode, fattr->cf_mode))) {
172 CIFS_I(inode)->time = 0; /* force reval */
173 return -ESTALE;
174 }
175 if (inode->i_state & I_NEW)
176 CIFS_I(inode)->netfs.zero_point = fattr->cf_eof;
177
178 cifs_revalidate_cache(inode, fattr);
179
180 spin_lock(&inode->i_lock);
181 fattr->cf_mtime = timestamp_truncate(fattr->cf_mtime, inode);
182 fattr->cf_atime = timestamp_truncate(fattr->cf_atime, inode);
183 fattr->cf_ctime = timestamp_truncate(fattr->cf_ctime, inode);
184 /* we do not want atime to be less than mtime, it broke some apps */
185 if (timespec64_compare(&fattr->cf_atime, &fattr->cf_mtime) < 0)
186 inode_set_atime_to_ts(inode, fattr->cf_mtime);
187 else
188 inode_set_atime_to_ts(inode, fattr->cf_atime);
189 inode_set_mtime_to_ts(inode, fattr->cf_mtime);
190 inode_set_ctime_to_ts(inode, fattr->cf_ctime);
191 inode->i_rdev = fattr->cf_rdev;
192 cifs_nlink_fattr_to_inode(inode, fattr);
193 inode->i_uid = fattr->cf_uid;
194 inode->i_gid = fattr->cf_gid;
195
196 /* if dynperm is set, don't clobber existing mode */
197 if (inode->i_state & I_NEW ||
198 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM))
199 inode->i_mode = fattr->cf_mode;
200
201 cifs_i->cifsAttrs = fattr->cf_cifsattrs;
202 cifs_i->reparse_tag = fattr->cf_cifstag;
203
204 if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
205 cifs_i->time = 0;
206 else
207 cifs_i->time = jiffies;
208
209 if (fattr->cf_flags & CIFS_FATTR_DELETE_PENDING)
210 set_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags);
211 else
212 clear_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags);
213
214 cifs_i->netfs.remote_i_size = fattr->cf_eof;
215 /*
216 * Can't safely change the file size here if the client is writing to
217 * it due to potential races.
218 */
219 if (is_size_safe_to_change(cifs_i, fattr->cf_eof, from_readdir)) {
220 i_size_write(inode, fattr->cf_eof);
221
222 /*
223 * i_blocks is not related to (i_size / i_blksize),
224 * but instead 512 byte (2**9) size is required for
225 * calculating num blocks.
226 */
227 inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
228 }
229
230 if (S_ISLNK(fattr->cf_mode) && fattr->cf_symlink_target) {
231 kfree(cifs_i->symlink_target);
232 cifs_i->symlink_target = fattr->cf_symlink_target;
233 fattr->cf_symlink_target = NULL;
234 }
235 spin_unlock(&inode->i_lock);
236
237 if (fattr->cf_flags & CIFS_FATTR_JUNCTION)
238 inode->i_flags |= S_AUTOMOUNT;
239 if (inode->i_state & I_NEW) {
240 cifs_set_netfs_context(inode);
241 cifs_set_ops(inode);
242 }
243 return 0;
244 }
245
246 void
cifs_fill_uniqueid(struct super_block * sb,struct cifs_fattr * fattr)247 cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
248 {
249 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
250
251 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
252 return;
253
254 fattr->cf_uniqueid = iunique(sb, ROOT_I);
255 }
256
257 /* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
258 void
cifs_unix_basic_to_fattr(struct cifs_fattr * fattr,FILE_UNIX_BASIC_INFO * info,struct cifs_sb_info * cifs_sb)259 cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
260 struct cifs_sb_info *cifs_sb)
261 {
262 memset(fattr, 0, sizeof(*fattr));
263 fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
264 fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
265 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
266
267 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
268 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime);
269 fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange);
270 /* old POSIX extensions don't get create time */
271
272 fattr->cf_mode = le64_to_cpu(info->Permissions);
273
274 /*
275 * Since we set the inode type below we need to mask off
276 * to avoid strange results if bits set above.
277 */
278 fattr->cf_mode &= ~S_IFMT;
279 switch (le32_to_cpu(info->Type)) {
280 case UNIX_FILE:
281 fattr->cf_mode |= S_IFREG;
282 fattr->cf_dtype = DT_REG;
283 break;
284 case UNIX_SYMLINK:
285 fattr->cf_mode |= S_IFLNK;
286 fattr->cf_dtype = DT_LNK;
287 break;
288 case UNIX_DIR:
289 fattr->cf_mode |= S_IFDIR;
290 fattr->cf_dtype = DT_DIR;
291 break;
292 case UNIX_CHARDEV:
293 fattr->cf_mode |= S_IFCHR;
294 fattr->cf_dtype = DT_CHR;
295 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
296 le64_to_cpu(info->DevMinor) & MINORMASK);
297 break;
298 case UNIX_BLOCKDEV:
299 fattr->cf_mode |= S_IFBLK;
300 fattr->cf_dtype = DT_BLK;
301 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
302 le64_to_cpu(info->DevMinor) & MINORMASK);
303 break;
304 case UNIX_FIFO:
305 fattr->cf_mode |= S_IFIFO;
306 fattr->cf_dtype = DT_FIFO;
307 break;
308 case UNIX_SOCKET:
309 fattr->cf_mode |= S_IFSOCK;
310 fattr->cf_dtype = DT_SOCK;
311 break;
312 default:
313 /* safest to call it a file if we do not know */
314 fattr->cf_mode |= S_IFREG;
315 fattr->cf_dtype = DT_REG;
316 cifs_dbg(FYI, "unknown type %d\n", le32_to_cpu(info->Type));
317 break;
318 }
319
320 fattr->cf_uid = cifs_sb->ctx->linux_uid;
321 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)) {
322 u64 id = le64_to_cpu(info->Uid);
323 if (id < ((uid_t)-1)) {
324 kuid_t uid = make_kuid(&init_user_ns, id);
325 if (uid_valid(uid))
326 fattr->cf_uid = uid;
327 }
328 }
329
330 fattr->cf_gid = cifs_sb->ctx->linux_gid;
331 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)) {
332 u64 id = le64_to_cpu(info->Gid);
333 if (id < ((gid_t)-1)) {
334 kgid_t gid = make_kgid(&init_user_ns, id);
335 if (gid_valid(gid))
336 fattr->cf_gid = gid;
337 }
338 }
339
340 fattr->cf_nlink = le64_to_cpu(info->Nlinks);
341 }
342
343 /*
344 * Fill a cifs_fattr struct with fake inode info.
345 *
346 * Needed to setup cifs_fattr data for the directory which is the
347 * junction to the new submount (ie to setup the fake directory
348 * which represents a DFS referral or reparse mount point).
349 */
cifs_create_junction_fattr(struct cifs_fattr * fattr,struct super_block * sb)350 static void cifs_create_junction_fattr(struct cifs_fattr *fattr,
351 struct super_block *sb)
352 {
353 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
354
355 cifs_dbg(FYI, "%s: creating fake fattr\n", __func__);
356
357 memset(fattr, 0, sizeof(*fattr));
358 fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
359 fattr->cf_uid = cifs_sb->ctx->linux_uid;
360 fattr->cf_gid = cifs_sb->ctx->linux_gid;
361 ktime_get_coarse_real_ts64(&fattr->cf_mtime);
362 fattr->cf_atime = fattr->cf_ctime = fattr->cf_mtime;
363 fattr->cf_nlink = 2;
364 fattr->cf_flags = CIFS_FATTR_JUNCTION;
365 }
366
367 /* Update inode with final fattr data */
update_inode_info(struct super_block * sb,struct cifs_fattr * fattr,struct inode ** inode)368 static int update_inode_info(struct super_block *sb,
369 struct cifs_fattr *fattr,
370 struct inode **inode)
371 {
372 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
373 int rc = 0;
374
375 if (!*inode) {
376 *inode = cifs_iget(sb, fattr);
377 if (!*inode)
378 rc = -ENOMEM;
379 return rc;
380 }
381 /* We already have inode, update it.
382 *
383 * If file type or uniqueid is different, return error.
384 */
385 if (unlikely((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
386 CIFS_I(*inode)->uniqueid != fattr->cf_uniqueid)) {
387 CIFS_I(*inode)->time = 0; /* force reval */
388 return -ESTALE;
389 }
390 return cifs_fattr_to_inode(*inode, fattr, false);
391 }
392
393 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
394 static int
cifs_get_file_info_unix(struct file * filp)395 cifs_get_file_info_unix(struct file *filp)
396 {
397 int rc;
398 unsigned int xid;
399 FILE_UNIX_BASIC_INFO find_data;
400 struct cifs_fattr fattr = {};
401 struct inode *inode = file_inode(filp);
402 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
403 struct cifsFileInfo *cfile = filp->private_data;
404 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
405
406 xid = get_xid();
407
408 if (cfile->symlink_target) {
409 fattr.cf_symlink_target = kstrdup(cfile->symlink_target, GFP_KERNEL);
410 if (!fattr.cf_symlink_target) {
411 rc = -ENOMEM;
412 goto cifs_gfiunix_out;
413 }
414 }
415
416 rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->fid.netfid, &find_data);
417 if (!rc) {
418 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
419 } else if (rc == -EREMOTE) {
420 cifs_create_junction_fattr(&fattr, inode->i_sb);
421 } else
422 goto cifs_gfiunix_out;
423
424 rc = cifs_fattr_to_inode(inode, &fattr, false);
425
426 cifs_gfiunix_out:
427 free_xid(xid);
428 return rc;
429 }
430
cifs_get_unix_fattr(const unsigned char * full_path,struct super_block * sb,struct cifs_fattr * fattr,struct inode ** pinode,const unsigned int xid)431 static int cifs_get_unix_fattr(const unsigned char *full_path,
432 struct super_block *sb,
433 struct cifs_fattr *fattr,
434 struct inode **pinode,
435 const unsigned int xid)
436 {
437 struct TCP_Server_Info *server;
438 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
439 FILE_UNIX_BASIC_INFO find_data;
440 struct cifs_tcon *tcon;
441 struct tcon_link *tlink;
442 int rc, tmprc;
443
444 cifs_dbg(FYI, "Getting info on %s\n", full_path);
445
446 tlink = cifs_sb_tlink(cifs_sb);
447 if (IS_ERR(tlink))
448 return PTR_ERR(tlink);
449 tcon = tlink_tcon(tlink);
450 server = tcon->ses->server;
451
452 /* could have done a find first instead but this returns more info */
453 rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
454 cifs_sb->local_nls, cifs_remap(cifs_sb));
455 cifs_dbg(FYI, "%s: query path info: rc = %d\n", __func__, rc);
456 cifs_put_tlink(tlink);
457
458 if (!rc) {
459 cifs_unix_basic_to_fattr(fattr, &find_data, cifs_sb);
460 } else if (rc == -EREMOTE) {
461 cifs_create_junction_fattr(fattr, sb);
462 rc = 0;
463 } else {
464 return rc;
465 }
466
467 if (!*pinode)
468 cifs_fill_uniqueid(sb, fattr);
469
470 /* check for Minshall+French symlinks */
471 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
472 tmprc = check_mf_symlink(xid, tcon, cifs_sb, fattr, full_path);
473 cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
474 }
475
476 if (S_ISLNK(fattr->cf_mode) && !fattr->cf_symlink_target) {
477 if (!server->ops->query_symlink)
478 return -EOPNOTSUPP;
479 rc = server->ops->query_symlink(xid, tcon,
480 cifs_sb, full_path,
481 &fattr->cf_symlink_target);
482 cifs_dbg(FYI, "%s: query_symlink: %d\n", __func__, rc);
483 }
484 return rc;
485 }
486
cifs_get_inode_info_unix(struct inode ** pinode,const unsigned char * full_path,struct super_block * sb,unsigned int xid)487 int cifs_get_inode_info_unix(struct inode **pinode,
488 const unsigned char *full_path,
489 struct super_block *sb, unsigned int xid)
490 {
491 struct cifs_fattr fattr = {};
492 int rc;
493
494 rc = cifs_get_unix_fattr(full_path, sb, &fattr, pinode, xid);
495 if (rc)
496 goto out;
497
498 rc = update_inode_info(sb, &fattr, pinode);
499 out:
500 kfree(fattr.cf_symlink_target);
501 return rc;
502 }
503 #else
cifs_get_unix_fattr(const unsigned char * full_path,struct super_block * sb,struct cifs_fattr * fattr,struct inode ** pinode,const unsigned int xid)504 static inline int cifs_get_unix_fattr(const unsigned char *full_path,
505 struct super_block *sb,
506 struct cifs_fattr *fattr,
507 struct inode **pinode,
508 const unsigned int xid)
509 {
510 return -EOPNOTSUPP;
511 }
512
cifs_get_inode_info_unix(struct inode ** pinode,const unsigned char * full_path,struct super_block * sb,unsigned int xid)513 int cifs_get_inode_info_unix(struct inode **pinode,
514 const unsigned char *full_path,
515 struct super_block *sb, unsigned int xid)
516 {
517 return -EOPNOTSUPP;
518 }
519 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
520
521 static int
cifs_sfu_type(struct cifs_fattr * fattr,const char * path,struct cifs_sb_info * cifs_sb,unsigned int xid)522 cifs_sfu_type(struct cifs_fattr *fattr, const char *path,
523 struct cifs_sb_info *cifs_sb, unsigned int xid)
524 {
525 int rc;
526 __u32 oplock;
527 struct tcon_link *tlink;
528 struct cifs_tcon *tcon;
529 struct cifs_fid fid;
530 struct cifs_open_parms oparms;
531 struct cifs_io_parms io_parms = {0};
532 char *symlink_buf_utf16;
533 unsigned int symlink_len_utf16;
534 char buf[24];
535 unsigned int bytes_read;
536 char *pbuf;
537 int buf_type = CIFS_NO_BUFFER;
538
539 pbuf = buf;
540
541 fattr->cf_mode &= ~S_IFMT;
542
543 if (fattr->cf_eof == 0) {
544 cifs_dbg(FYI, "Fifo\n");
545 fattr->cf_mode |= S_IFIFO;
546 fattr->cf_dtype = DT_FIFO;
547 return 0;
548 } else if (fattr->cf_eof > 1 && fattr->cf_eof < 8) {
549 fattr->cf_mode |= S_IFREG;
550 fattr->cf_dtype = DT_REG;
551 return -EINVAL; /* EOPNOTSUPP? */
552 }
553
554 tlink = cifs_sb_tlink(cifs_sb);
555 if (IS_ERR(tlink))
556 return PTR_ERR(tlink);
557 tcon = tlink_tcon(tlink);
558
559 oparms = (struct cifs_open_parms) {
560 .tcon = tcon,
561 .cifs_sb = cifs_sb,
562 .desired_access = GENERIC_READ,
563 .create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),
564 .disposition = FILE_OPEN,
565 .path = path,
566 .fid = &fid,
567 };
568
569 if (tcon->ses->server->oplocks)
570 oplock = REQ_OPLOCK;
571 else
572 oplock = 0;
573 rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, NULL);
574 if (rc) {
575 cifs_dbg(FYI, "check sfu type of %s, open rc = %d\n", path, rc);
576 cifs_put_tlink(tlink);
577 return rc;
578 }
579
580 /* Read header */
581 io_parms.netfid = fid.netfid;
582 io_parms.pid = current->tgid;
583 io_parms.tcon = tcon;
584 io_parms.offset = 0;
585 io_parms.length = 24;
586
587 rc = tcon->ses->server->ops->sync_read(xid, &fid, &io_parms,
588 &bytes_read, &pbuf, &buf_type);
589 if ((rc == 0) && (bytes_read >= 8)) {
590 if (memcmp("IntxBLK\0", pbuf, 8) == 0) {
591 cifs_dbg(FYI, "Block device\n");
592 fattr->cf_mode |= S_IFBLK;
593 fattr->cf_dtype = DT_BLK;
594 if (bytes_read == 24) {
595 /* we have enough to decode dev num */
596 __u64 mjr; /* major */
597 __u64 mnr; /* minor */
598 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
599 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
600 fattr->cf_rdev = MKDEV(mjr, mnr);
601 } else if (bytes_read == 16) {
602 /*
603 * Windows NFS server before Windows Server 2012
604 * stores major and minor number in SFU-modified
605 * style, just as 32-bit numbers. Recognize it.
606 */
607 __u32 mjr; /* major */
608 __u32 mnr; /* minor */
609 mjr = le32_to_cpu(*(__le32 *)(pbuf+8));
610 mnr = le32_to_cpu(*(__le32 *)(pbuf+12));
611 fattr->cf_rdev = MKDEV(mjr, mnr);
612 }
613 } else if (memcmp("IntxCHR\0", pbuf, 8) == 0) {
614 cifs_dbg(FYI, "Char device\n");
615 fattr->cf_mode |= S_IFCHR;
616 fattr->cf_dtype = DT_CHR;
617 if (bytes_read == 24) {
618 /* we have enough to decode dev num */
619 __u64 mjr; /* major */
620 __u64 mnr; /* minor */
621 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
622 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
623 fattr->cf_rdev = MKDEV(mjr, mnr);
624 } else if (bytes_read == 16) {
625 /*
626 * Windows NFS server before Windows Server 2012
627 * stores major and minor number in SFU-modified
628 * style, just as 32-bit numbers. Recognize it.
629 */
630 __u32 mjr; /* major */
631 __u32 mnr; /* minor */
632 mjr = le32_to_cpu(*(__le32 *)(pbuf+8));
633 mnr = le32_to_cpu(*(__le32 *)(pbuf+12));
634 fattr->cf_rdev = MKDEV(mjr, mnr);
635 }
636 } else if (memcmp("LnxSOCK", pbuf, 8) == 0) {
637 cifs_dbg(FYI, "Socket\n");
638 fattr->cf_mode |= S_IFSOCK;
639 fattr->cf_dtype = DT_SOCK;
640 } else if (memcmp("IntxLNK\1", pbuf, 8) == 0) {
641 cifs_dbg(FYI, "Symlink\n");
642 fattr->cf_mode |= S_IFLNK;
643 fattr->cf_dtype = DT_LNK;
644 if ((fattr->cf_eof > 8) && (fattr->cf_eof % 2 == 0)) {
645 symlink_buf_utf16 = kmalloc(fattr->cf_eof-8 + 1, GFP_KERNEL);
646 if (symlink_buf_utf16) {
647 io_parms.offset = 8;
648 io_parms.length = fattr->cf_eof-8 + 1;
649 buf_type = CIFS_NO_BUFFER;
650 rc = tcon->ses->server->ops->sync_read(xid, &fid, &io_parms,
651 &symlink_len_utf16,
652 &symlink_buf_utf16,
653 &buf_type);
654 /*
655 * Check that read buffer has valid length and does not
656 * contain UTF-16 null codepoint (via UniStrnlen() call)
657 * because Linux cannot process symlink with null byte.
658 */
659 if ((rc == 0) &&
660 (symlink_len_utf16 > 0) &&
661 (symlink_len_utf16 < fattr->cf_eof-8 + 1) &&
662 (symlink_len_utf16 % 2 == 0) &&
663 (UniStrnlen((wchar_t *)symlink_buf_utf16, symlink_len_utf16/2) == symlink_len_utf16/2)) {
664 fattr->cf_symlink_target =
665 cifs_strndup_from_utf16(symlink_buf_utf16,
666 symlink_len_utf16,
667 true,
668 cifs_sb->local_nls);
669 if (!fattr->cf_symlink_target)
670 rc = -ENOMEM;
671 }
672 kfree(symlink_buf_utf16);
673 } else {
674 rc = -ENOMEM;
675 }
676 }
677 } else if (memcmp("LnxFIFO", pbuf, 8) == 0) {
678 cifs_dbg(FYI, "FIFO\n");
679 fattr->cf_mode |= S_IFIFO;
680 fattr->cf_dtype = DT_FIFO;
681 } else {
682 fattr->cf_mode |= S_IFREG; /* file? */
683 fattr->cf_dtype = DT_REG;
684 rc = -EOPNOTSUPP;
685 }
686 } else if ((rc == 0) && (bytes_read == 1) && (pbuf[0] == '\0')) {
687 cifs_dbg(FYI, "Socket\n");
688 fattr->cf_mode |= S_IFSOCK;
689 fattr->cf_dtype = DT_SOCK;
690 } else {
691 fattr->cf_mode |= S_IFREG; /* then it is a file */
692 fattr->cf_dtype = DT_REG;
693 rc = -EOPNOTSUPP; /* or some unknown SFU type */
694 }
695
696 tcon->ses->server->ops->close(xid, tcon, &fid);
697 cifs_put_tlink(tlink);
698 return rc;
699 }
700
701 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */
702
703 /*
704 * Fetch mode bits as provided by SFU.
705 *
706 * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ?
707 */
cifs_sfu_mode(struct cifs_fattr * fattr,const unsigned char * path,struct cifs_sb_info * cifs_sb,unsigned int xid)708 static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
709 struct cifs_sb_info *cifs_sb, unsigned int xid)
710 {
711 #ifdef CONFIG_CIFS_XATTR
712 ssize_t rc;
713 char ea_value[4];
714 __u32 mode;
715 struct tcon_link *tlink;
716 struct cifs_tcon *tcon;
717
718 tlink = cifs_sb_tlink(cifs_sb);
719 if (IS_ERR(tlink))
720 return PTR_ERR(tlink);
721 tcon = tlink_tcon(tlink);
722
723 if (tcon->ses->server->ops->query_all_EAs == NULL) {
724 cifs_put_tlink(tlink);
725 return -EOPNOTSUPP;
726 }
727
728 rc = tcon->ses->server->ops->query_all_EAs(xid, tcon, path,
729 "SETFILEBITS", ea_value, 4 /* size of buf */,
730 cifs_sb);
731 cifs_put_tlink(tlink);
732 if (rc < 0)
733 return (int)rc;
734 else if (rc > 3) {
735 mode = le32_to_cpu(*((__le32 *)ea_value));
736 fattr->cf_mode &= ~SFBITS_MASK;
737 cifs_dbg(FYI, "special bits 0%o org mode 0%o\n",
738 mode, fattr->cf_mode);
739 fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode;
740 cifs_dbg(FYI, "special mode bits 0%o\n", mode);
741 }
742
743 return 0;
744 #else
745 return -EOPNOTSUPP;
746 #endif
747 }
748
749 #define POSIX_TYPE_FILE 0
750 #define POSIX_TYPE_DIR 1
751 #define POSIX_TYPE_SYMLINK 2
752 #define POSIX_TYPE_CHARDEV 3
753 #define POSIX_TYPE_BLKDEV 4
754 #define POSIX_TYPE_FIFO 5
755 #define POSIX_TYPE_SOCKET 6
756
757 #define POSIX_X_OTH 0000001
758 #define POSIX_W_OTH 0000002
759 #define POSIX_R_OTH 0000004
760 #define POSIX_X_GRP 0000010
761 #define POSIX_W_GRP 0000020
762 #define POSIX_R_GRP 0000040
763 #define POSIX_X_USR 0000100
764 #define POSIX_W_USR 0000200
765 #define POSIX_R_USR 0000400
766 #define POSIX_STICKY 0001000
767 #define POSIX_SET_GID 0002000
768 #define POSIX_SET_UID 0004000
769
770 #define POSIX_OTH_MASK 0000007
771 #define POSIX_GRP_MASK 0000070
772 #define POSIX_USR_MASK 0000700
773 #define POSIX_PERM_MASK 0000777
774 #define POSIX_FILETYPE_MASK 0070000
775
776 #define POSIX_FILETYPE_SHIFT 12
777
wire_perms_to_posix(u32 wire)778 static u32 wire_perms_to_posix(u32 wire)
779 {
780 u32 mode = 0;
781
782 mode |= (wire & POSIX_X_OTH) ? S_IXOTH : 0;
783 mode |= (wire & POSIX_W_OTH) ? S_IWOTH : 0;
784 mode |= (wire & POSIX_R_OTH) ? S_IROTH : 0;
785 mode |= (wire & POSIX_X_GRP) ? S_IXGRP : 0;
786 mode |= (wire & POSIX_W_GRP) ? S_IWGRP : 0;
787 mode |= (wire & POSIX_R_GRP) ? S_IRGRP : 0;
788 mode |= (wire & POSIX_X_USR) ? S_IXUSR : 0;
789 mode |= (wire & POSIX_W_USR) ? S_IWUSR : 0;
790 mode |= (wire & POSIX_R_USR) ? S_IRUSR : 0;
791 mode |= (wire & POSIX_STICKY) ? S_ISVTX : 0;
792 mode |= (wire & POSIX_SET_GID) ? S_ISGID : 0;
793 mode |= (wire & POSIX_SET_UID) ? S_ISUID : 0;
794
795 return mode;
796 }
797
798 static u32 posix_filetypes[] = {
799 S_IFREG,
800 S_IFDIR,
801 S_IFLNK,
802 S_IFCHR,
803 S_IFBLK,
804 S_IFIFO,
805 S_IFSOCK
806 };
807
wire_filetype_to_posix(u32 wire_type)808 static u32 wire_filetype_to_posix(u32 wire_type)
809 {
810 if (wire_type >= ARRAY_SIZE(posix_filetypes)) {
811 pr_warn("Unexpected type %u", wire_type);
812 return 0;
813 }
814 return posix_filetypes[wire_type];
815 }
816
wire_mode_to_posix(u32 wire,bool is_dir)817 umode_t wire_mode_to_posix(u32 wire, bool is_dir)
818 {
819 u32 wire_type;
820 u32 mode;
821
822 wire_type = (wire & POSIX_FILETYPE_MASK) >> POSIX_FILETYPE_SHIFT;
823 /* older servers do not set POSIX file type in the mode field in the response */
824 if ((wire_type == 0) && is_dir)
825 mode = wire_perms_to_posix(wire) | S_IFDIR;
826 else
827 mode = (wire_perms_to_posix(wire) | wire_filetype_to_posix(wire_type));
828 return (umode_t)mode;
829 }
830
831 /* Fill a cifs_fattr struct with info from POSIX info struct */
smb311_posix_info_to_fattr(struct cifs_fattr * fattr,struct cifs_open_info_data * data,struct super_block * sb)832 static void smb311_posix_info_to_fattr(struct cifs_fattr *fattr,
833 struct cifs_open_info_data *data,
834 struct super_block *sb)
835 {
836 struct smb311_posix_qinfo *info = &data->posix_fi;
837 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
838 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
839
840 memset(fattr, 0, sizeof(*fattr));
841
842 /* no fattr->flags to set */
843 fattr->cf_cifsattrs = le32_to_cpu(info->DosAttributes);
844 fattr->cf_uniqueid = le64_to_cpu(info->Inode);
845
846 if (info->LastAccessTime)
847 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
848 else
849 ktime_get_coarse_real_ts64(&fattr->cf_atime);
850
851 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
852 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
853
854 if (data->adjust_tz) {
855 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
856 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
857 }
858
859 /*
860 * The srv fs device id is overridden on network mount so setting
861 * @fattr->cf_rdev isn't needed here.
862 */
863 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
864 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
865 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
866 fattr->cf_nlink = le32_to_cpu(info->HardLinks);
867 fattr->cf_mode = wire_mode_to_posix(le32_to_cpu(info->Mode),
868 fattr->cf_cifsattrs & ATTR_DIRECTORY);
869
870 if (cifs_open_data_reparse(data) &&
871 cifs_reparse_point_to_fattr(cifs_sb, fattr, data))
872 goto out_reparse;
873
874 fattr->cf_dtype = S_DT(fattr->cf_mode);
875
876 out_reparse:
877 if (S_ISLNK(fattr->cf_mode)) {
878 if (likely(data->symlink_target))
879 fattr->cf_eof = strnlen(data->symlink_target, PATH_MAX);
880 fattr->cf_symlink_target = data->symlink_target;
881 data->symlink_target = NULL;
882 }
883 sid_to_id(cifs_sb, &data->posix_owner, fattr, SIDOWNER);
884 sid_to_id(cifs_sb, &data->posix_group, fattr, SIDGROUP);
885
886 cifs_dbg(FYI, "POSIX query info: mode 0x%x uniqueid 0x%llx nlink %d\n",
887 fattr->cf_mode, fattr->cf_uniqueid, fattr->cf_nlink);
888 }
889
cifs_open_info_to_fattr(struct cifs_fattr * fattr,struct cifs_open_info_data * data,struct super_block * sb)890 static void cifs_open_info_to_fattr(struct cifs_fattr *fattr,
891 struct cifs_open_info_data *data,
892 struct super_block *sb)
893 {
894 struct smb2_file_all_info *info = &data->fi;
895 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
896 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
897
898 memset(fattr, 0, sizeof(*fattr));
899 fattr->cf_cifsattrs = le32_to_cpu(info->Attributes);
900 if (info->DeletePending)
901 fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING;
902
903 if (info->LastAccessTime)
904 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
905 else
906 ktime_get_coarse_real_ts64(&fattr->cf_atime);
907
908 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
909 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
910
911 if (data->adjust_tz) {
912 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
913 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
914 }
915
916 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
917 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
918 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
919 fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
920 fattr->cf_uid = cifs_sb->ctx->linux_uid;
921 fattr->cf_gid = cifs_sb->ctx->linux_gid;
922
923 fattr->cf_mode = cifs_sb->ctx->file_mode;
924 if (cifs_open_data_reparse(data) &&
925 cifs_reparse_point_to_fattr(cifs_sb, fattr, data))
926 goto out_reparse;
927
928 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
929 fattr->cf_mode = S_IFDIR | cifs_sb->ctx->dir_mode;
930 fattr->cf_dtype = DT_DIR;
931 /*
932 * Server can return wrong NumberOfLinks value for directories
933 * when Unix extensions are disabled - fake it.
934 */
935 if (!tcon->unix_ext)
936 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
937 } else {
938 fattr->cf_mode = S_IFREG | cifs_sb->ctx->file_mode;
939 fattr->cf_dtype = DT_REG;
940
941 /*
942 * Don't accept zero nlink from non-unix servers unless
943 * delete is pending. Instead mark it as unknown.
944 */
945 if ((fattr->cf_nlink < 1) && !tcon->unix_ext &&
946 !info->DeletePending) {
947 cifs_dbg(VFS, "bogus file nlink value %u\n",
948 fattr->cf_nlink);
949 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
950 }
951 }
952
953 /* clear write bits if ATTR_READONLY is set */
954 if (fattr->cf_cifsattrs & ATTR_READONLY)
955 fattr->cf_mode &= ~(S_IWUGO);
956
957 out_reparse:
958 if (S_ISLNK(fattr->cf_mode)) {
959 if (likely(data->symlink_target))
960 fattr->cf_eof = strnlen(data->symlink_target, PATH_MAX);
961 fattr->cf_symlink_target = data->symlink_target;
962 data->symlink_target = NULL;
963 }
964 }
965
966 static int
cifs_get_file_info(struct file * filp)967 cifs_get_file_info(struct file *filp)
968 {
969 int rc;
970 unsigned int xid;
971 struct cifs_open_info_data data = {};
972 struct cifs_fattr fattr;
973 struct inode *inode = file_inode(filp);
974 struct cifsFileInfo *cfile = filp->private_data;
975 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
976 struct TCP_Server_Info *server = tcon->ses->server;
977 struct dentry *dentry = filp->f_path.dentry;
978 void *page = alloc_dentry_path();
979 const unsigned char *path;
980
981 if (!server->ops->query_file_info) {
982 free_dentry_path(page);
983 return -ENOSYS;
984 }
985
986 xid = get_xid();
987 rc = server->ops->query_file_info(xid, tcon, cfile, &data);
988 switch (rc) {
989 case 0:
990 /* TODO: add support to query reparse tag */
991 data.adjust_tz = false;
992 if (data.symlink_target) {
993 data.reparse_point = true;
994 data.reparse.tag = IO_REPARSE_TAG_SYMLINK;
995 }
996 path = build_path_from_dentry(dentry, page);
997 if (IS_ERR(path)) {
998 rc = PTR_ERR(path);
999 goto cgfi_exit;
1000 }
1001 cifs_open_info_to_fattr(&fattr, &data, inode->i_sb);
1002 if (fattr.cf_flags & CIFS_FATTR_DELETE_PENDING)
1003 cifs_mark_open_handles_for_deleted_file(inode, path);
1004 break;
1005 case -EREMOTE:
1006 cifs_create_junction_fattr(&fattr, inode->i_sb);
1007 break;
1008 case -EOPNOTSUPP:
1009 case -EINVAL:
1010 /*
1011 * FIXME: legacy server -- fall back to path-based call?
1012 * for now, just skip revalidating and mark inode for
1013 * immediate reval.
1014 */
1015 rc = 0;
1016 CIFS_I(inode)->time = 0;
1017 goto cgfi_exit;
1018 default:
1019 goto cgfi_exit;
1020 }
1021
1022 /*
1023 * don't bother with SFU junk here -- just mark inode as needing
1024 * revalidation.
1025 */
1026 fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
1027 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
1028 /* if filetype is different, return error */
1029 rc = cifs_fattr_to_inode(inode, &fattr, false);
1030 cgfi_exit:
1031 cifs_free_open_info(&data);
1032 free_dentry_path(page);
1033 free_xid(xid);
1034 return rc;
1035 }
1036
1037 /* Simple function to return a 64 bit hash of string. Rarely called */
simple_hashstr(const char * str)1038 static __u64 simple_hashstr(const char *str)
1039 {
1040 const __u64 hash_mult = 1125899906842597ULL; /* a big enough prime */
1041 __u64 hash = 0;
1042
1043 while (*str)
1044 hash = (hash + (__u64) *str++) * hash_mult;
1045
1046 return hash;
1047 }
1048
1049 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1050 /**
1051 * cifs_backup_query_path_info - SMB1 fallback code to get ino
1052 *
1053 * Fallback code to get file metadata when we don't have access to
1054 * full_path (EACCES) and have backup creds.
1055 *
1056 * @xid: transaction id used to identify original request in logs
1057 * @tcon: information about the server share we have mounted
1058 * @sb: the superblock stores info such as disk space available
1059 * @full_path: name of the file we are getting the metadata for
1060 * @resp_buf: will be set to cifs resp buf and needs to be freed with
1061 * cifs_buf_release() when done with @data
1062 * @data: will be set to search info result buffer
1063 */
1064 static int
cifs_backup_query_path_info(int xid,struct cifs_tcon * tcon,struct super_block * sb,const char * full_path,void ** resp_buf,FILE_ALL_INFO ** data)1065 cifs_backup_query_path_info(int xid,
1066 struct cifs_tcon *tcon,
1067 struct super_block *sb,
1068 const char *full_path,
1069 void **resp_buf,
1070 FILE_ALL_INFO **data)
1071 {
1072 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1073 struct cifs_search_info info = {0};
1074 u16 flags;
1075 int rc;
1076
1077 *resp_buf = NULL;
1078 info.endOfSearch = false;
1079 if (tcon->unix_ext)
1080 info.info_level = SMB_FIND_FILE_UNIX;
1081 else if ((tcon->ses->capabilities &
1082 tcon->ses->server->vals->cap_nt_find) == 0)
1083 info.info_level = SMB_FIND_FILE_INFO_STANDARD;
1084 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
1085 info.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
1086 else /* no srvino useful for fallback to some netapp */
1087 info.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
1088
1089 flags = CIFS_SEARCH_CLOSE_ALWAYS |
1090 CIFS_SEARCH_CLOSE_AT_END |
1091 CIFS_SEARCH_BACKUP_SEARCH;
1092
1093 rc = CIFSFindFirst(xid, tcon, full_path,
1094 cifs_sb, NULL, flags, &info, false);
1095 if (rc)
1096 return rc;
1097
1098 *resp_buf = (void *)info.ntwrk_buf_start;
1099 *data = (FILE_ALL_INFO *)info.srch_entries_start;
1100 return 0;
1101 }
1102 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1103
cifs_set_fattr_ino(int xid,struct cifs_tcon * tcon,struct super_block * sb,struct inode ** inode,const char * full_path,struct cifs_open_info_data * data,struct cifs_fattr * fattr)1104 static void cifs_set_fattr_ino(int xid, struct cifs_tcon *tcon, struct super_block *sb,
1105 struct inode **inode, const char *full_path,
1106 struct cifs_open_info_data *data, struct cifs_fattr *fattr)
1107 {
1108 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1109 struct TCP_Server_Info *server = tcon->ses->server;
1110 int rc;
1111
1112 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
1113 if (*inode)
1114 fattr->cf_uniqueid = CIFS_I(*inode)->uniqueid;
1115 else
1116 fattr->cf_uniqueid = iunique(sb, ROOT_I);
1117 return;
1118 }
1119
1120 /*
1121 * If we have an inode pass a NULL tcon to ensure we don't
1122 * make a round trip to the server. This only works for SMB2+.
1123 */
1124 rc = server->ops->get_srv_inum(xid, *inode ? NULL : tcon, cifs_sb, full_path,
1125 &fattr->cf_uniqueid, data);
1126 if (rc) {
1127 /*
1128 * If that fails reuse existing ino or generate one
1129 * and disable server ones
1130 */
1131 if (*inode)
1132 fattr->cf_uniqueid = CIFS_I(*inode)->uniqueid;
1133 else {
1134 fattr->cf_uniqueid = iunique(sb, ROOT_I);
1135 cifs_autodisable_serverino(cifs_sb);
1136 }
1137 return;
1138 }
1139
1140 /* If no errors, check for zero root inode (invalid) */
1141 if (fattr->cf_uniqueid == 0 && strlen(full_path) == 0) {
1142 cifs_dbg(FYI, "Invalid (0) inodenum\n");
1143 if (*inode) {
1144 /* reuse */
1145 fattr->cf_uniqueid = CIFS_I(*inode)->uniqueid;
1146 } else {
1147 /* make an ino by hashing the UNC */
1148 fattr->cf_flags |= CIFS_FATTR_FAKE_ROOT_INO;
1149 fattr->cf_uniqueid = simple_hashstr(tcon->tree_name);
1150 }
1151 }
1152 }
1153
is_inode_cache_good(struct inode * ino)1154 static inline bool is_inode_cache_good(struct inode *ino)
1155 {
1156 return ino && CIFS_CACHE_READ(CIFS_I(ino)) && CIFS_I(ino)->time != 0;
1157 }
1158
reparse_info_to_fattr(struct cifs_open_info_data * data,struct super_block * sb,const unsigned int xid,struct cifs_tcon * tcon,const char * full_path,struct cifs_fattr * fattr)1159 static int reparse_info_to_fattr(struct cifs_open_info_data *data,
1160 struct super_block *sb,
1161 const unsigned int xid,
1162 struct cifs_tcon *tcon,
1163 const char *full_path,
1164 struct cifs_fattr *fattr)
1165 {
1166 struct TCP_Server_Info *server = tcon->ses->server;
1167 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1168 struct kvec rsp_iov, *iov = NULL;
1169 int rsp_buftype = CIFS_NO_BUFFER;
1170 u32 tag = data->reparse.tag;
1171 int rc = 0;
1172
1173 if (!tag && server->ops->query_reparse_point) {
1174 rc = server->ops->query_reparse_point(xid, tcon, cifs_sb,
1175 full_path, &tag,
1176 &rsp_iov, &rsp_buftype);
1177 if (!rc)
1178 iov = &rsp_iov;
1179 } else if (data->reparse.io.buftype != CIFS_NO_BUFFER &&
1180 data->reparse.io.iov.iov_base) {
1181 iov = &data->reparse.io.iov;
1182 }
1183
1184 rc = -EOPNOTSUPP;
1185 data->reparse.tag = tag;
1186 if (!data->reparse.tag) {
1187 if (server->ops->query_symlink) {
1188 rc = server->ops->query_symlink(xid, tcon,
1189 cifs_sb, full_path,
1190 &data->symlink_target);
1191 }
1192 if (rc == -EOPNOTSUPP)
1193 data->reparse.tag = IO_REPARSE_TAG_INTERNAL;
1194 }
1195
1196 switch (data->reparse.tag) {
1197 case 0: /* SMB1 symlink */
1198 break;
1199 case IO_REPARSE_TAG_INTERNAL:
1200 rc = 0;
1201 if (le32_to_cpu(data->fi.Attributes) & ATTR_DIRECTORY) {
1202 cifs_create_junction_fattr(fattr, sb);
1203 goto out;
1204 }
1205 break;
1206 default:
1207 /* Check for cached reparse point data */
1208 if (data->symlink_target || data->reparse.buf) {
1209 rc = 0;
1210 } else if (iov && server->ops->get_reparse_point_buffer) {
1211 struct reparse_data_buffer *reparse_buf;
1212 u32 reparse_len;
1213
1214 reparse_buf = server->ops->get_reparse_point_buffer(iov, &reparse_len);
1215 rc = parse_reparse_point(reparse_buf, reparse_len,
1216 cifs_sb, full_path, data);
1217 /*
1218 * If the reparse point was not handled but it is the
1219 * name surrogate which points to directory, then treat
1220 * is as a new mount point. Name surrogate reparse point
1221 * represents another named entity in the system.
1222 */
1223 if (rc == -EOPNOTSUPP &&
1224 IS_REPARSE_TAG_NAME_SURROGATE(data->reparse.tag) &&
1225 (le32_to_cpu(data->fi.Attributes) & ATTR_DIRECTORY)) {
1226 rc = 0;
1227 cifs_create_junction_fattr(fattr, sb);
1228 goto out;
1229 }
1230 /*
1231 * If the reparse point is unsupported by the Linux SMB
1232 * client then let it process by the SMB server. So mask
1233 * the -EOPNOTSUPP error code. This will allow Linux SMB
1234 * client to send SMB OPEN request to server. If server
1235 * does not support this reparse point too then server
1236 * will return error during open the path.
1237 */
1238 if (rc == -EOPNOTSUPP)
1239 rc = 0;
1240 }
1241
1242 if (data->reparse.tag == IO_REPARSE_TAG_SYMLINK && !rc) {
1243 bool directory = le32_to_cpu(data->fi.Attributes) & ATTR_DIRECTORY;
1244 rc = smb2_fix_symlink_target_type(&data->symlink_target, directory, cifs_sb);
1245 }
1246 break;
1247 }
1248
1249 if (tcon->posix_extensions)
1250 smb311_posix_info_to_fattr(fattr, data, sb);
1251 else
1252 cifs_open_info_to_fattr(fattr, data, sb);
1253 out:
1254 fattr->cf_cifstag = data->reparse.tag;
1255 free_rsp_buf(rsp_buftype, rsp_iov.iov_base);
1256 return rc;
1257 }
1258
cifs_get_fattr(struct cifs_open_info_data * data,struct super_block * sb,int xid,const struct cifs_fid * fid,struct cifs_fattr * fattr,struct inode ** inode,const char * full_path)1259 static int cifs_get_fattr(struct cifs_open_info_data *data,
1260 struct super_block *sb, int xid,
1261 const struct cifs_fid *fid,
1262 struct cifs_fattr *fattr,
1263 struct inode **inode,
1264 const char *full_path)
1265 {
1266 struct cifs_open_info_data tmp_data = {};
1267 struct cifs_tcon *tcon;
1268 struct TCP_Server_Info *server;
1269 struct tcon_link *tlink;
1270 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1271 void *smb1_backup_rsp_buf = NULL;
1272 int rc = 0;
1273 int tmprc = 0;
1274
1275 tlink = cifs_sb_tlink(cifs_sb);
1276 if (IS_ERR(tlink))
1277 return PTR_ERR(tlink);
1278 tcon = tlink_tcon(tlink);
1279 server = tcon->ses->server;
1280
1281 /*
1282 * 1. Fetch file metadata if not provided (data)
1283 */
1284
1285 if (!data) {
1286 rc = server->ops->query_path_info(xid, tcon, cifs_sb,
1287 full_path, &tmp_data);
1288 data = &tmp_data;
1289 }
1290
1291 /*
1292 * 2. Convert it to internal cifs metadata (fattr)
1293 */
1294
1295 switch (rc) {
1296 case 0:
1297 /*
1298 * If the file is a reparse point, it is more complicated
1299 * since we have to check if its reparse tag matches a known
1300 * special file type e.g. symlink or fifo or char etc.
1301 */
1302 if (cifs_open_data_reparse(data)) {
1303 rc = reparse_info_to_fattr(data, sb, xid, tcon,
1304 full_path, fattr);
1305 } else {
1306 cifs_open_info_to_fattr(fattr, data, sb);
1307 }
1308 if (!rc && *inode &&
1309 (fattr->cf_flags & CIFS_FATTR_DELETE_PENDING))
1310 cifs_mark_open_handles_for_deleted_file(*inode, full_path);
1311 break;
1312 case -EREMOTE:
1313 /* DFS link, no metadata available on this server */
1314 cifs_create_junction_fattr(fattr, sb);
1315 rc = 0;
1316 break;
1317 case -EACCES:
1318 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1319 /*
1320 * perm errors, try again with backup flags if possible
1321 *
1322 * For SMB2 and later the backup intent flag
1323 * is already sent if needed on open and there
1324 * is no path based FindFirst operation to use
1325 * to retry with
1326 */
1327 if (backup_cred(cifs_sb) && is_smb1_server(server)) {
1328 /* for easier reading */
1329 FILE_ALL_INFO *fi;
1330 FILE_DIRECTORY_INFO *fdi;
1331 SEARCH_ID_FULL_DIR_INFO *si;
1332
1333 rc = cifs_backup_query_path_info(xid, tcon, sb,
1334 full_path,
1335 &smb1_backup_rsp_buf,
1336 &fi);
1337 if (rc)
1338 goto out;
1339
1340 move_cifs_info_to_smb2(&data->fi, fi);
1341 fdi = (FILE_DIRECTORY_INFO *)fi;
1342 si = (SEARCH_ID_FULL_DIR_INFO *)fi;
1343
1344 cifs_dir_info_to_fattr(fattr, fdi, cifs_sb);
1345 fattr->cf_uniqueid = le64_to_cpu(si->UniqueId);
1346 /* uniqueid set, skip get inum step */
1347 goto handle_mnt_opt;
1348 } else {
1349 /* nothing we can do, bail out */
1350 goto out;
1351 }
1352 #else
1353 goto out;
1354 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1355 break;
1356 default:
1357 cifs_dbg(FYI, "%s: unhandled err rc %d\n", __func__, rc);
1358 goto out;
1359 }
1360
1361 /*
1362 * 3. Get or update inode number (fattr->cf_uniqueid)
1363 */
1364
1365 cifs_set_fattr_ino(xid, tcon, sb, inode, full_path, data, fattr);
1366
1367 /*
1368 * 4. Tweak fattr based on mount options
1369 */
1370 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1371 handle_mnt_opt:
1372 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1373 /* query for SFU type info if supported and needed */
1374 if ((fattr->cf_cifsattrs & ATTR_SYSTEM) &&
1375 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
1376 tmprc = cifs_sfu_type(fattr, full_path, cifs_sb, xid);
1377 if (tmprc)
1378 cifs_dbg(FYI, "cifs_sfu_type failed: %d\n", tmprc);
1379 }
1380
1381 /* fill in 0777 bits from ACL */
1382 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) {
1383 rc = cifs_acl_to_fattr(cifs_sb, fattr, *inode,
1384 true, full_path, fid);
1385 if (rc == -EREMOTE)
1386 rc = 0;
1387 if (rc) {
1388 cifs_dbg(FYI, "%s: Get mode from SID failed. rc=%d\n",
1389 __func__, rc);
1390 goto out;
1391 }
1392 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
1393 rc = cifs_acl_to_fattr(cifs_sb, fattr, *inode,
1394 false, full_path, fid);
1395 if (rc == -EREMOTE)
1396 rc = 0;
1397 if (rc) {
1398 cifs_dbg(FYI, "%s: Getting ACL failed with error: %d\n",
1399 __func__, rc);
1400 goto out;
1401 }
1402 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
1403 /* fill in remaining high mode bits e.g. SUID, VTX */
1404 cifs_sfu_mode(fattr, full_path, cifs_sb, xid);
1405 else if (!(tcon->posix_extensions))
1406 /* clear write bits if ATTR_READONLY is set */
1407 if (fattr->cf_cifsattrs & ATTR_READONLY)
1408 fattr->cf_mode &= ~(S_IWUGO);
1409
1410
1411 /* check for Minshall+French symlinks */
1412 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
1413 tmprc = check_mf_symlink(xid, tcon, cifs_sb, fattr, full_path);
1414 cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
1415 }
1416
1417 out:
1418 cifs_buf_release(smb1_backup_rsp_buf);
1419 cifs_put_tlink(tlink);
1420 cifs_free_open_info(&tmp_data);
1421 return rc;
1422 }
1423
cifs_get_inode_info(struct inode ** inode,const char * full_path,struct cifs_open_info_data * data,struct super_block * sb,int xid,const struct cifs_fid * fid)1424 int cifs_get_inode_info(struct inode **inode,
1425 const char *full_path,
1426 struct cifs_open_info_data *data,
1427 struct super_block *sb, int xid,
1428 const struct cifs_fid *fid)
1429 {
1430 struct cifs_fattr fattr = {};
1431 int rc;
1432
1433 if (!data && is_inode_cache_good(*inode)) {
1434 cifs_dbg(FYI, "No need to revalidate cached inode sizes\n");
1435 return 0;
1436 }
1437
1438 rc = cifs_get_fattr(data, sb, xid, fid, &fattr, inode, full_path);
1439 if (rc)
1440 goto out;
1441
1442 rc = update_inode_info(sb, &fattr, inode);
1443 out:
1444 kfree(fattr.cf_symlink_target);
1445 return rc;
1446 }
1447
smb311_posix_get_fattr(struct cifs_open_info_data * data,struct cifs_fattr * fattr,const char * full_path,struct super_block * sb,const unsigned int xid)1448 static int smb311_posix_get_fattr(struct cifs_open_info_data *data,
1449 struct cifs_fattr *fattr,
1450 const char *full_path,
1451 struct super_block *sb,
1452 const unsigned int xid)
1453 {
1454 struct cifs_open_info_data tmp_data = {};
1455 struct TCP_Server_Info *server;
1456 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1457 struct cifs_tcon *tcon;
1458 struct tcon_link *tlink;
1459 int tmprc;
1460 int rc = 0;
1461
1462 tlink = cifs_sb_tlink(cifs_sb);
1463 if (IS_ERR(tlink))
1464 return PTR_ERR(tlink);
1465 tcon = tlink_tcon(tlink);
1466 server = tcon->ses->server;
1467
1468 /*
1469 * 1. Fetch file metadata if not provided (data)
1470 */
1471 if (!data) {
1472 rc = server->ops->query_path_info(xid, tcon, cifs_sb,
1473 full_path, &tmp_data);
1474 data = &tmp_data;
1475 }
1476
1477 /*
1478 * 2. Convert it to internal cifs metadata (fattr)
1479 */
1480
1481 switch (rc) {
1482 case 0:
1483 if (cifs_open_data_reparse(data)) {
1484 rc = reparse_info_to_fattr(data, sb, xid, tcon,
1485 full_path, fattr);
1486 } else {
1487 smb311_posix_info_to_fattr(fattr, data, sb);
1488 }
1489 break;
1490 case -EREMOTE:
1491 /* DFS link, no metadata available on this server */
1492 cifs_create_junction_fattr(fattr, sb);
1493 rc = 0;
1494 break;
1495 case -EACCES:
1496 /*
1497 * For SMB2 and later the backup intent flag
1498 * is already sent if needed on open and there
1499 * is no path based FindFirst operation to use
1500 * to retry with so nothing we can do, bail out
1501 */
1502 goto out;
1503 default:
1504 cifs_dbg(FYI, "%s: unhandled err rc %d\n", __func__, rc);
1505 goto out;
1506 }
1507
1508 /*
1509 * 3. Tweak fattr based on mount options
1510 */
1511 /* check for Minshall+French symlinks */
1512 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
1513 tmprc = check_mf_symlink(xid, tcon, cifs_sb, fattr, full_path);
1514 cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
1515 }
1516
1517 out:
1518 cifs_put_tlink(tlink);
1519 cifs_free_open_info(data);
1520 return rc;
1521 }
1522
smb311_posix_get_inode_info(struct inode ** inode,const char * full_path,struct cifs_open_info_data * data,struct super_block * sb,const unsigned int xid)1523 int smb311_posix_get_inode_info(struct inode **inode,
1524 const char *full_path,
1525 struct cifs_open_info_data *data,
1526 struct super_block *sb,
1527 const unsigned int xid)
1528 {
1529 struct cifs_fattr fattr = {};
1530 int rc;
1531
1532 if (!data && is_inode_cache_good(*inode)) {
1533 cifs_dbg(FYI, "No need to revalidate cached inode sizes\n");
1534 return 0;
1535 }
1536
1537 rc = smb311_posix_get_fattr(data, &fattr, full_path, sb, xid);
1538 if (rc)
1539 goto out;
1540
1541 rc = update_inode_info(sb, &fattr, inode);
1542 if (!rc && fattr.cf_flags & CIFS_FATTR_DELETE_PENDING)
1543 cifs_mark_open_handles_for_deleted_file(*inode, full_path);
1544 out:
1545 kfree(fattr.cf_symlink_target);
1546 return rc;
1547 }
1548
1549 static const struct inode_operations cifs_ipc_inode_ops = {
1550 .lookup = cifs_lookup,
1551 };
1552
1553 static int
cifs_find_inode(struct inode * inode,void * opaque)1554 cifs_find_inode(struct inode *inode, void *opaque)
1555 {
1556 struct cifs_fattr *fattr = opaque;
1557
1558 /* [!] The compared values must be the same in struct cifs_fscache_inode_key. */
1559
1560 /* don't match inode with different uniqueid */
1561 if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
1562 return 0;
1563
1564 /* use createtime like an i_generation field */
1565 if (CIFS_I(inode)->createtime != fattr->cf_createtime)
1566 return 0;
1567
1568 /* don't match inode of different type */
1569 if (inode_wrong_type(inode, fattr->cf_mode))
1570 return 0;
1571
1572 /* if it's not a directory or has no dentries, then flag it */
1573 if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry))
1574 fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
1575
1576 return 1;
1577 }
1578
1579 static int
cifs_init_inode(struct inode * inode,void * opaque)1580 cifs_init_inode(struct inode *inode, void *opaque)
1581 {
1582 struct cifs_fattr *fattr = opaque;
1583
1584 CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
1585 CIFS_I(inode)->createtime = fattr->cf_createtime;
1586 return 0;
1587 }
1588
1589 /*
1590 * walk dentry list for an inode and report whether it has aliases that
1591 * are hashed. We use this to determine if a directory inode can actually
1592 * be used.
1593 */
1594 static bool
inode_has_hashed_dentries(struct inode * inode)1595 inode_has_hashed_dentries(struct inode *inode)
1596 {
1597 struct dentry *dentry;
1598
1599 spin_lock(&inode->i_lock);
1600 hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) {
1601 if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
1602 spin_unlock(&inode->i_lock);
1603 return true;
1604 }
1605 }
1606 spin_unlock(&inode->i_lock);
1607 return false;
1608 }
1609
1610 /* Given fattrs, get a corresponding inode */
1611 struct inode *
cifs_iget(struct super_block * sb,struct cifs_fattr * fattr)1612 cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
1613 {
1614 unsigned long hash;
1615 struct inode *inode;
1616
1617 retry_iget5_locked:
1618 cifs_dbg(FYI, "looking for uniqueid=%llu\n", fattr->cf_uniqueid);
1619
1620 /* hash down to 32-bits on 32-bit arch */
1621 hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
1622
1623 inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
1624 if (inode) {
1625 /* was there a potentially problematic inode collision? */
1626 if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
1627 fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
1628
1629 if (inode_has_hashed_dentries(inode)) {
1630 cifs_autodisable_serverino(CIFS_SB(sb));
1631 iput(inode);
1632 fattr->cf_uniqueid = iunique(sb, ROOT_I);
1633 goto retry_iget5_locked;
1634 }
1635 }
1636
1637 /* can't fail - see cifs_find_inode() */
1638 cifs_fattr_to_inode(inode, fattr, false);
1639 if (sb->s_flags & SB_NOATIME)
1640 inode->i_flags |= S_NOATIME | S_NOCMTIME;
1641 if (inode->i_state & I_NEW) {
1642 inode->i_ino = hash;
1643 cifs_fscache_get_inode_cookie(inode);
1644 unlock_new_inode(inode);
1645 }
1646 }
1647
1648 return inode;
1649 }
1650
1651 /* gets root inode */
cifs_root_iget(struct super_block * sb)1652 struct inode *cifs_root_iget(struct super_block *sb)
1653 {
1654 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1655 struct cifs_fattr fattr = {};
1656 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
1657 struct inode *inode = NULL;
1658 unsigned int xid;
1659 char *path = NULL;
1660 int len;
1661 int rc;
1662
1663 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
1664 && cifs_sb->prepath) {
1665 len = strlen(cifs_sb->prepath);
1666 path = kzalloc(len + 2 /* leading sep + null */, GFP_KERNEL);
1667 if (path == NULL)
1668 return ERR_PTR(-ENOMEM);
1669 path[0] = '/';
1670 memcpy(path+1, cifs_sb->prepath, len);
1671 } else {
1672 path = kstrdup("", GFP_KERNEL);
1673 if (path == NULL)
1674 return ERR_PTR(-ENOMEM);
1675 }
1676
1677 xid = get_xid();
1678 if (tcon->unix_ext) {
1679 rc = cifs_get_unix_fattr(path, sb, &fattr, &inode, xid);
1680 /* some servers mistakenly claim POSIX support */
1681 if (rc != -EOPNOTSUPP)
1682 goto iget_root;
1683 cifs_dbg(VFS, "server does not support POSIX extensions\n");
1684 tcon->unix_ext = false;
1685 }
1686
1687 convert_delimiter(path, CIFS_DIR_SEP(cifs_sb));
1688 if (tcon->posix_extensions)
1689 rc = smb311_posix_get_fattr(NULL, &fattr, path, sb, xid);
1690 else
1691 rc = cifs_get_fattr(NULL, sb, xid, NULL, &fattr, &inode, path);
1692
1693 iget_root:
1694 if (!rc) {
1695 if (fattr.cf_flags & CIFS_FATTR_JUNCTION) {
1696 fattr.cf_flags &= ~CIFS_FATTR_JUNCTION;
1697 cifs_autodisable_serverino(cifs_sb);
1698 }
1699 inode = cifs_iget(sb, &fattr);
1700 }
1701
1702 if (!inode) {
1703 inode = ERR_PTR(rc);
1704 goto out;
1705 }
1706
1707 if (!rc && fattr.cf_flags & CIFS_FATTR_DELETE_PENDING)
1708 cifs_mark_open_handles_for_deleted_file(inode, path);
1709
1710 if (rc && tcon->pipe) {
1711 cifs_dbg(FYI, "ipc connection - fake read inode\n");
1712 spin_lock(&inode->i_lock);
1713 inode->i_mode |= S_IFDIR;
1714 set_nlink(inode, 2);
1715 inode->i_op = &cifs_ipc_inode_ops;
1716 inode->i_fop = &simple_dir_operations;
1717 inode->i_uid = cifs_sb->ctx->linux_uid;
1718 inode->i_gid = cifs_sb->ctx->linux_gid;
1719 spin_unlock(&inode->i_lock);
1720 } else if (rc) {
1721 iget_failed(inode);
1722 inode = ERR_PTR(rc);
1723 }
1724
1725 out:
1726 kfree(path);
1727 free_xid(xid);
1728 kfree(fattr.cf_symlink_target);
1729 return inode;
1730 }
1731
1732 int
cifs_set_file_info(struct inode * inode,struct iattr * attrs,unsigned int xid,const char * full_path,__u32 dosattr)1733 cifs_set_file_info(struct inode *inode, struct iattr *attrs, unsigned int xid,
1734 const char *full_path, __u32 dosattr)
1735 {
1736 bool set_time = false;
1737 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1738 struct TCP_Server_Info *server;
1739 FILE_BASIC_INFO info_buf;
1740
1741 if (attrs == NULL)
1742 return -EINVAL;
1743
1744 server = cifs_sb_master_tcon(cifs_sb)->ses->server;
1745 if (!server->ops->set_file_info)
1746 return -ENOSYS;
1747
1748 info_buf.Pad = 0;
1749
1750 if (attrs->ia_valid & ATTR_ATIME) {
1751 set_time = true;
1752 info_buf.LastAccessTime =
1753 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1754 } else
1755 info_buf.LastAccessTime = 0;
1756
1757 if (attrs->ia_valid & ATTR_MTIME) {
1758 set_time = true;
1759 info_buf.LastWriteTime =
1760 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1761 } else
1762 info_buf.LastWriteTime = 0;
1763
1764 /*
1765 * Samba throws this field away, but windows may actually use it.
1766 * Do not set ctime unless other time stamps are changed explicitly
1767 * (i.e. by utimes()) since we would then have a mix of client and
1768 * server times.
1769 */
1770 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1771 cifs_dbg(FYI, "CIFS - CTIME changed\n");
1772 info_buf.ChangeTime =
1773 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1774 } else
1775 info_buf.ChangeTime = 0;
1776
1777 info_buf.CreationTime = 0; /* don't change */
1778 info_buf.Attributes = cpu_to_le32(dosattr);
1779
1780 return server->ops->set_file_info(inode, full_path, &info_buf, xid);
1781 }
1782
1783 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1784 /*
1785 * Open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
1786 * and rename it to a random name that hopefully won't conflict with
1787 * anything else.
1788 */
1789 int
cifs_rename_pending_delete(const char * full_path,struct dentry * dentry,const unsigned int xid)1790 cifs_rename_pending_delete(const char *full_path, struct dentry *dentry,
1791 const unsigned int xid)
1792 {
1793 int oplock = 0;
1794 int rc;
1795 struct cifs_fid fid;
1796 struct cifs_open_parms oparms;
1797 struct inode *inode = d_inode(dentry);
1798 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1799 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1800 struct tcon_link *tlink;
1801 struct cifs_tcon *tcon;
1802 __u32 dosattr, origattr;
1803 FILE_BASIC_INFO *info_buf = NULL;
1804
1805 tlink = cifs_sb_tlink(cifs_sb);
1806 if (IS_ERR(tlink))
1807 return PTR_ERR(tlink);
1808 tcon = tlink_tcon(tlink);
1809
1810 /*
1811 * We cannot rename the file if the server doesn't support
1812 * CAP_INFOLEVEL_PASSTHRU
1813 */
1814 if (!(tcon->ses->capabilities & CAP_INFOLEVEL_PASSTHRU)) {
1815 rc = -EBUSY;
1816 goto out;
1817 }
1818
1819 oparms = (struct cifs_open_parms) {
1820 .tcon = tcon,
1821 .cifs_sb = cifs_sb,
1822 .desired_access = DELETE | FILE_WRITE_ATTRIBUTES,
1823 .create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),
1824 .disposition = FILE_OPEN,
1825 .path = full_path,
1826 .fid = &fid,
1827 };
1828
1829 rc = CIFS_open(xid, &oparms, &oplock, NULL);
1830 if (rc != 0)
1831 goto out;
1832
1833 origattr = cifsInode->cifsAttrs;
1834 if (origattr == 0)
1835 origattr |= ATTR_NORMAL;
1836
1837 dosattr = origattr & ~ATTR_READONLY;
1838 if (dosattr == 0)
1839 dosattr |= ATTR_NORMAL;
1840 dosattr |= ATTR_HIDDEN;
1841
1842 /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
1843 if (dosattr != origattr) {
1844 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
1845 if (info_buf == NULL) {
1846 rc = -ENOMEM;
1847 goto out_close;
1848 }
1849 info_buf->Attributes = cpu_to_le32(dosattr);
1850 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid,
1851 current->tgid);
1852 /* although we would like to mark the file hidden
1853 if that fails we will still try to rename it */
1854 if (!rc)
1855 cifsInode->cifsAttrs = dosattr;
1856 else
1857 dosattr = origattr; /* since not able to change them */
1858 }
1859
1860 /* rename the file */
1861 rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, NULL,
1862 cifs_sb->local_nls,
1863 cifs_remap(cifs_sb));
1864 if (rc != 0) {
1865 rc = -EBUSY;
1866 goto undo_setattr;
1867 }
1868
1869 /* try to set DELETE_ON_CLOSE */
1870 if (!test_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags)) {
1871 rc = CIFSSMBSetFileDisposition(xid, tcon, true, fid.netfid,
1872 current->tgid);
1873 /*
1874 * some samba versions return -ENOENT when we try to set the
1875 * file disposition here. Likely a samba bug, but work around
1876 * it for now. This means that some cifsXXX files may hang
1877 * around after they shouldn't.
1878 *
1879 * BB: remove this hack after more servers have the fix
1880 */
1881 if (rc == -ENOENT)
1882 rc = 0;
1883 else if (rc != 0) {
1884 rc = -EBUSY;
1885 goto undo_rename;
1886 }
1887 set_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags);
1888 }
1889
1890 out_close:
1891 CIFSSMBClose(xid, tcon, fid.netfid);
1892 out:
1893 kfree(info_buf);
1894 cifs_put_tlink(tlink);
1895 return rc;
1896
1897 /*
1898 * reset everything back to the original state. Don't bother
1899 * dealing with errors here since we can't do anything about
1900 * them anyway.
1901 */
1902 undo_rename:
1903 CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, dentry->d_name.name,
1904 cifs_sb->local_nls, cifs_remap(cifs_sb));
1905 undo_setattr:
1906 if (dosattr != origattr) {
1907 info_buf->Attributes = cpu_to_le32(origattr);
1908 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid,
1909 current->tgid))
1910 cifsInode->cifsAttrs = origattr;
1911 }
1912
1913 goto out_close;
1914 }
1915 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1916
1917 /* copied from fs/nfs/dir.c with small changes */
1918 static void
cifs_drop_nlink(struct inode * inode)1919 cifs_drop_nlink(struct inode *inode)
1920 {
1921 spin_lock(&inode->i_lock);
1922 if (inode->i_nlink > 0)
1923 drop_nlink(inode);
1924 spin_unlock(&inode->i_lock);
1925 }
1926
1927 /*
1928 * If d_inode(dentry) is null (usually meaning the cached dentry
1929 * is a negative dentry) then we would attempt a standard SMB delete, but
1930 * if that fails we can not attempt the fall back mechanisms on EACCES
1931 * but will return the EACCES to the caller. Note that the VFS does not call
1932 * unlink on negative dentries currently.
1933 */
cifs_unlink(struct inode * dir,struct dentry * dentry)1934 int cifs_unlink(struct inode *dir, struct dentry *dentry)
1935 {
1936 int rc = 0;
1937 unsigned int xid;
1938 const char *full_path;
1939 void *page;
1940 struct inode *inode = d_inode(dentry);
1941 struct cifsInodeInfo *cifs_inode;
1942 struct super_block *sb = dir->i_sb;
1943 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1944 struct tcon_link *tlink;
1945 struct cifs_tcon *tcon;
1946 struct TCP_Server_Info *server;
1947 struct iattr *attrs = NULL;
1948 __u32 dosattr = 0, origattr = 0;
1949
1950 cifs_dbg(FYI, "cifs_unlink, dir=0x%p, dentry=0x%p\n", dir, dentry);
1951
1952 if (unlikely(cifs_forced_shutdown(cifs_sb)))
1953 return -EIO;
1954
1955 tlink = cifs_sb_tlink(cifs_sb);
1956 if (IS_ERR(tlink))
1957 return PTR_ERR(tlink);
1958 tcon = tlink_tcon(tlink);
1959 server = tcon->ses->server;
1960
1961 xid = get_xid();
1962 page = alloc_dentry_path();
1963
1964 if (tcon->nodelete) {
1965 rc = -EACCES;
1966 goto unlink_out;
1967 }
1968
1969 /* Unlink can be called from rename so we can not take the
1970 * sb->s_vfs_rename_mutex here */
1971 full_path = build_path_from_dentry(dentry, page);
1972 if (IS_ERR(full_path)) {
1973 rc = PTR_ERR(full_path);
1974 goto unlink_out;
1975 }
1976
1977 netfs_wait_for_outstanding_io(inode);
1978 cifs_close_deferred_file_under_dentry(tcon, full_path);
1979 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1980 if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1981 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1982 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
1983 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
1984 cifs_remap(cifs_sb));
1985 cifs_dbg(FYI, "posix del rc %d\n", rc);
1986 if ((rc == 0) || (rc == -ENOENT))
1987 goto psx_del_no_retry;
1988 }
1989 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
1990
1991 retry_std_delete:
1992 if (!server->ops->unlink) {
1993 rc = -ENOSYS;
1994 goto psx_del_no_retry;
1995 }
1996
1997 rc = server->ops->unlink(xid, tcon, full_path, cifs_sb, dentry);
1998
1999 psx_del_no_retry:
2000 if (!rc) {
2001 if (inode) {
2002 cifs_mark_open_handles_for_deleted_file(inode, full_path);
2003 cifs_drop_nlink(inode);
2004 }
2005 } else if (rc == -ENOENT) {
2006 d_drop(dentry);
2007 } else if (rc == -EBUSY) {
2008 if (server->ops->rename_pending_delete) {
2009 rc = server->ops->rename_pending_delete(full_path,
2010 dentry, xid);
2011 if (rc == 0) {
2012 cifs_mark_open_handles_for_deleted_file(inode, full_path);
2013 cifs_drop_nlink(inode);
2014 }
2015 }
2016 } else if ((rc == -EACCES) && (dosattr == 0) && inode) {
2017 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
2018 if (attrs == NULL) {
2019 rc = -ENOMEM;
2020 goto out_reval;
2021 }
2022
2023 /* try to reset dos attributes */
2024 cifs_inode = CIFS_I(inode);
2025 origattr = cifs_inode->cifsAttrs;
2026 if (origattr == 0)
2027 origattr |= ATTR_NORMAL;
2028 dosattr = origattr & ~ATTR_READONLY;
2029 if (dosattr == 0)
2030 dosattr |= ATTR_NORMAL;
2031 dosattr |= ATTR_HIDDEN;
2032
2033 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
2034 if (rc != 0)
2035 goto out_reval;
2036
2037 goto retry_std_delete;
2038 }
2039
2040 /* undo the setattr if we errored out and it's needed */
2041 if (rc != 0 && dosattr != 0)
2042 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
2043
2044 out_reval:
2045 if (inode) {
2046 cifs_inode = CIFS_I(inode);
2047 cifs_inode->time = 0; /* will force revalidate to get info
2048 when needed */
2049 inode_set_ctime_current(inode);
2050 }
2051 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
2052 cifs_inode = CIFS_I(dir);
2053 CIFS_I(dir)->time = 0; /* force revalidate of dir as well */
2054 unlink_out:
2055 free_dentry_path(page);
2056 kfree(attrs);
2057 free_xid(xid);
2058 cifs_put_tlink(tlink);
2059 return rc;
2060 }
2061
2062 static int
cifs_mkdir_qinfo(struct inode * parent,struct dentry * dentry,umode_t mode,const char * full_path,struct cifs_sb_info * cifs_sb,struct cifs_tcon * tcon,const unsigned int xid)2063 cifs_mkdir_qinfo(struct inode *parent, struct dentry *dentry, umode_t mode,
2064 const char *full_path, struct cifs_sb_info *cifs_sb,
2065 struct cifs_tcon *tcon, const unsigned int xid)
2066 {
2067 int rc = 0;
2068 struct inode *inode = NULL;
2069
2070 if (tcon->posix_extensions) {
2071 rc = smb311_posix_get_inode_info(&inode, full_path,
2072 NULL, parent->i_sb, xid);
2073 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2074 } else if (tcon->unix_ext) {
2075 rc = cifs_get_inode_info_unix(&inode, full_path, parent->i_sb,
2076 xid);
2077 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2078 } else {
2079 rc = cifs_get_inode_info(&inode, full_path, NULL, parent->i_sb,
2080 xid, NULL);
2081 }
2082
2083 if (rc)
2084 return rc;
2085
2086 if (!S_ISDIR(inode->i_mode)) {
2087 /*
2088 * mkdir succeeded, but another client has managed to remove the
2089 * sucker and replace it with non-directory. Return success,
2090 * but don't leave the child in dcache.
2091 */
2092 iput(inode);
2093 d_drop(dentry);
2094 return 0;
2095 }
2096 /*
2097 * setting nlink not necessary except in cases where we failed to get it
2098 * from the server or was set bogus. Also, since this is a brand new
2099 * inode, no need to grab the i_lock before setting the i_nlink.
2100 */
2101 if (inode->i_nlink < 2)
2102 set_nlink(inode, 2);
2103 mode &= ~current_umask();
2104 /* must turn on setgid bit if parent dir has it */
2105 if (parent->i_mode & S_ISGID)
2106 mode |= S_ISGID;
2107
2108 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2109 if (tcon->unix_ext) {
2110 struct cifs_unix_set_info_args args = {
2111 .mode = mode,
2112 .ctime = NO_CHANGE_64,
2113 .atime = NO_CHANGE_64,
2114 .mtime = NO_CHANGE_64,
2115 .device = 0,
2116 };
2117 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
2118 args.uid = current_fsuid();
2119 if (parent->i_mode & S_ISGID)
2120 args.gid = parent->i_gid;
2121 else
2122 args.gid = current_fsgid();
2123 } else {
2124 args.uid = INVALID_UID; /* no change */
2125 args.gid = INVALID_GID; /* no change */
2126 }
2127 CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
2128 cifs_sb->local_nls,
2129 cifs_remap(cifs_sb));
2130 } else {
2131 #else
2132 {
2133 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2134 struct TCP_Server_Info *server = tcon->ses->server;
2135 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
2136 (mode & S_IWUGO) == 0 && server->ops->mkdir_setinfo)
2137 server->ops->mkdir_setinfo(inode, full_path, cifs_sb,
2138 tcon, xid);
2139 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
2140 inode->i_mode = (mode | S_IFDIR);
2141
2142 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
2143 inode->i_uid = current_fsuid();
2144 if (inode->i_mode & S_ISGID)
2145 inode->i_gid = parent->i_gid;
2146 else
2147 inode->i_gid = current_fsgid();
2148 }
2149 }
2150 d_instantiate(dentry, inode);
2151 return 0;
2152 }
2153
2154 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2155 static int
2156 cifs_posix_mkdir(struct inode *inode, struct dentry *dentry, umode_t mode,
2157 const char *full_path, struct cifs_sb_info *cifs_sb,
2158 struct cifs_tcon *tcon, const unsigned int xid)
2159 {
2160 int rc = 0;
2161 u32 oplock = 0;
2162 FILE_UNIX_BASIC_INFO *info = NULL;
2163 struct inode *newinode = NULL;
2164 struct cifs_fattr fattr;
2165
2166 info = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
2167 if (info == NULL) {
2168 rc = -ENOMEM;
2169 goto posix_mkdir_out;
2170 }
2171
2172 mode &= ~current_umask();
2173 rc = CIFSPOSIXCreate(xid, tcon, SMB_O_DIRECTORY | SMB_O_CREAT, mode,
2174 NULL /* netfid */, info, &oplock, full_path,
2175 cifs_sb->local_nls, cifs_remap(cifs_sb));
2176 if (rc == -EOPNOTSUPP)
2177 goto posix_mkdir_out;
2178 else if (rc) {
2179 cifs_dbg(FYI, "posix mkdir returned 0x%x\n", rc);
2180 d_drop(dentry);
2181 goto posix_mkdir_out;
2182 }
2183
2184 if (info->Type == cpu_to_le32(-1))
2185 /* no return info, go query for it */
2186 goto posix_mkdir_get_info;
2187 /*
2188 * BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if
2189 * need to set uid/gid.
2190 */
2191
2192 cifs_unix_basic_to_fattr(&fattr, info, cifs_sb);
2193 cifs_fill_uniqueid(inode->i_sb, &fattr);
2194 newinode = cifs_iget(inode->i_sb, &fattr);
2195 if (!newinode)
2196 goto posix_mkdir_get_info;
2197
2198 d_instantiate(dentry, newinode);
2199
2200 #ifdef CONFIG_CIFS_DEBUG2
2201 cifs_dbg(FYI, "instantiated dentry %p %pd to inode %p\n",
2202 dentry, dentry, newinode);
2203
2204 if (newinode->i_nlink != 2)
2205 cifs_dbg(FYI, "unexpected number of links %d\n",
2206 newinode->i_nlink);
2207 #endif
2208
2209 posix_mkdir_out:
2210 kfree(info);
2211 return rc;
2212 posix_mkdir_get_info:
2213 rc = cifs_mkdir_qinfo(inode, dentry, mode, full_path, cifs_sb, tcon,
2214 xid);
2215 goto posix_mkdir_out;
2216 }
2217 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2218
2219 struct dentry *cifs_mkdir(struct mnt_idmap *idmap, struct inode *inode,
2220 struct dentry *direntry, umode_t mode)
2221 {
2222 int rc = 0;
2223 unsigned int xid;
2224 struct cifs_sb_info *cifs_sb;
2225 struct tcon_link *tlink;
2226 struct cifs_tcon *tcon;
2227 struct TCP_Server_Info *server;
2228 const char *full_path;
2229 void *page;
2230
2231 cifs_dbg(FYI, "In cifs_mkdir, mode = %04ho inode = 0x%p\n",
2232 mode, inode);
2233
2234 cifs_sb = CIFS_SB(inode->i_sb);
2235 if (unlikely(cifs_forced_shutdown(cifs_sb)))
2236 return ERR_PTR(-EIO);
2237 tlink = cifs_sb_tlink(cifs_sb);
2238 if (IS_ERR(tlink))
2239 return ERR_CAST(tlink);
2240 tcon = tlink_tcon(tlink);
2241
2242 xid = get_xid();
2243
2244 page = alloc_dentry_path();
2245 full_path = build_path_from_dentry(direntry, page);
2246 if (IS_ERR(full_path)) {
2247 rc = PTR_ERR(full_path);
2248 goto mkdir_out;
2249 }
2250
2251 server = tcon->ses->server;
2252
2253 if ((server->ops->posix_mkdir) && (tcon->posix_extensions)) {
2254 rc = server->ops->posix_mkdir(xid, inode, mode, tcon, full_path,
2255 cifs_sb);
2256 d_drop(direntry); /* for time being always refresh inode info */
2257 goto mkdir_out;
2258 }
2259
2260 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2261 if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
2262 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
2263 rc = cifs_posix_mkdir(inode, direntry, mode, full_path, cifs_sb,
2264 tcon, xid);
2265 if (rc != -EOPNOTSUPP)
2266 goto mkdir_out;
2267 }
2268 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2269
2270 if (!server->ops->mkdir) {
2271 rc = -ENOSYS;
2272 goto mkdir_out;
2273 }
2274
2275 /* BB add setting the equivalent of mode via CreateX w/ACLs */
2276 rc = server->ops->mkdir(xid, inode, mode, tcon, full_path, cifs_sb);
2277 if (rc) {
2278 cifs_dbg(FYI, "cifs_mkdir returned 0x%x\n", rc);
2279 d_drop(direntry);
2280 goto mkdir_out;
2281 }
2282
2283 /* TODO: skip this for smb2/smb3 */
2284 rc = cifs_mkdir_qinfo(inode, direntry, mode, full_path, cifs_sb, tcon,
2285 xid);
2286 mkdir_out:
2287 /*
2288 * Force revalidate to get parent dir info when needed since cached
2289 * attributes are invalid now.
2290 */
2291 CIFS_I(inode)->time = 0;
2292 free_dentry_path(page);
2293 free_xid(xid);
2294 cifs_put_tlink(tlink);
2295 return ERR_PTR(rc);
2296 }
2297
2298 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
2299 {
2300 int rc = 0;
2301 unsigned int xid;
2302 struct cifs_sb_info *cifs_sb;
2303 struct tcon_link *tlink;
2304 struct cifs_tcon *tcon;
2305 struct TCP_Server_Info *server;
2306 const char *full_path;
2307 void *page = alloc_dentry_path();
2308 struct cifsInodeInfo *cifsInode;
2309
2310 cifs_dbg(FYI, "cifs_rmdir, inode = 0x%p\n", inode);
2311
2312 xid = get_xid();
2313
2314 full_path = build_path_from_dentry(direntry, page);
2315 if (IS_ERR(full_path)) {
2316 rc = PTR_ERR(full_path);
2317 goto rmdir_exit;
2318 }
2319
2320 cifs_sb = CIFS_SB(inode->i_sb);
2321 if (unlikely(cifs_forced_shutdown(cifs_sb))) {
2322 rc = -EIO;
2323 goto rmdir_exit;
2324 }
2325
2326 tlink = cifs_sb_tlink(cifs_sb);
2327 if (IS_ERR(tlink)) {
2328 rc = PTR_ERR(tlink);
2329 goto rmdir_exit;
2330 }
2331 tcon = tlink_tcon(tlink);
2332 server = tcon->ses->server;
2333
2334 if (!server->ops->rmdir) {
2335 rc = -ENOSYS;
2336 cifs_put_tlink(tlink);
2337 goto rmdir_exit;
2338 }
2339
2340 if (tcon->nodelete) {
2341 rc = -EACCES;
2342 cifs_put_tlink(tlink);
2343 goto rmdir_exit;
2344 }
2345
2346 rc = server->ops->rmdir(xid, tcon, full_path, cifs_sb);
2347 cifs_put_tlink(tlink);
2348
2349 if (!rc) {
2350 spin_lock(&d_inode(direntry)->i_lock);
2351 i_size_write(d_inode(direntry), 0);
2352 clear_nlink(d_inode(direntry));
2353 spin_unlock(&d_inode(direntry)->i_lock);
2354 }
2355
2356 cifsInode = CIFS_I(d_inode(direntry));
2357 /* force revalidate to go get info when needed */
2358 cifsInode->time = 0;
2359
2360 cifsInode = CIFS_I(inode);
2361 /*
2362 * Force revalidate to get parent dir info when needed since cached
2363 * attributes are invalid now.
2364 */
2365 cifsInode->time = 0;
2366
2367 inode_set_ctime_current(d_inode(direntry));
2368 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
2369
2370 rmdir_exit:
2371 free_dentry_path(page);
2372 free_xid(xid);
2373 return rc;
2374 }
2375
2376 static int
2377 cifs_do_rename(const unsigned int xid, struct dentry *from_dentry,
2378 const char *from_path, struct dentry *to_dentry,
2379 const char *to_path)
2380 {
2381 struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
2382 struct tcon_link *tlink;
2383 struct cifs_tcon *tcon;
2384 struct TCP_Server_Info *server;
2385 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2386 struct cifs_fid fid;
2387 struct cifs_open_parms oparms;
2388 int oplock;
2389 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2390 int rc;
2391
2392 tlink = cifs_sb_tlink(cifs_sb);
2393 if (IS_ERR(tlink))
2394 return PTR_ERR(tlink);
2395 tcon = tlink_tcon(tlink);
2396 server = tcon->ses->server;
2397
2398 if (!server->ops->rename)
2399 return -ENOSYS;
2400
2401 /* try path-based rename first */
2402 rc = server->ops->rename(xid, tcon, from_dentry,
2403 from_path, to_path, cifs_sb);
2404
2405 /*
2406 * Don't bother with rename by filehandle unless file is busy and
2407 * source. Note that cross directory moves do not work with
2408 * rename by filehandle to various Windows servers.
2409 */
2410 if (rc == 0 || rc != -EBUSY)
2411 goto do_rename_exit;
2412
2413 /* Don't fall back to using SMB on SMB 2+ mount */
2414 if (server->vals->protocol_id != 0)
2415 goto do_rename_exit;
2416
2417 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2418 /* open-file renames don't work across directories */
2419 if (to_dentry->d_parent != from_dentry->d_parent)
2420 goto do_rename_exit;
2421
2422 /*
2423 * CIFSSMBRenameOpenFile() uses SMB_SET_FILE_RENAME_INFORMATION
2424 * which is SMB PASSTHROUGH level.
2425 */
2426 if (!(tcon->ses->capabilities & CAP_INFOLEVEL_PASSTHRU))
2427 goto do_rename_exit;
2428
2429 oparms = (struct cifs_open_parms) {
2430 .tcon = tcon,
2431 .cifs_sb = cifs_sb,
2432 /* open the file to be renamed -- we need DELETE perms */
2433 .desired_access = DELETE,
2434 .create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),
2435 .disposition = FILE_OPEN,
2436 .path = from_path,
2437 .fid = &fid,
2438 };
2439
2440 rc = CIFS_open(xid, &oparms, &oplock, NULL);
2441 if (rc == 0) {
2442 rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid,
2443 (const char *) to_dentry->d_name.name,
2444 cifs_sb->local_nls, cifs_remap(cifs_sb));
2445 CIFSSMBClose(xid, tcon, fid.netfid);
2446 }
2447 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2448 do_rename_exit:
2449 if (rc == 0)
2450 d_move(from_dentry, to_dentry);
2451 cifs_put_tlink(tlink);
2452 return rc;
2453 }
2454
2455 int
2456 cifs_rename2(struct mnt_idmap *idmap, struct inode *source_dir,
2457 struct dentry *source_dentry, struct inode *target_dir,
2458 struct dentry *target_dentry, unsigned int flags)
2459 {
2460 const char *from_name, *to_name;
2461 void *page1, *page2;
2462 struct cifs_sb_info *cifs_sb;
2463 struct tcon_link *tlink;
2464 struct cifs_tcon *tcon;
2465 unsigned int xid;
2466 int rc, tmprc;
2467 int retry_count = 0;
2468 FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
2469 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2470 FILE_UNIX_BASIC_INFO *info_buf_target;
2471 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2472
2473 if (flags & ~RENAME_NOREPLACE)
2474 return -EINVAL;
2475
2476 cifs_sb = CIFS_SB(source_dir->i_sb);
2477 if (unlikely(cifs_forced_shutdown(cifs_sb)))
2478 return -EIO;
2479
2480 tlink = cifs_sb_tlink(cifs_sb);
2481 if (IS_ERR(tlink))
2482 return PTR_ERR(tlink);
2483 tcon = tlink_tcon(tlink);
2484
2485 page1 = alloc_dentry_path();
2486 page2 = alloc_dentry_path();
2487 xid = get_xid();
2488
2489 from_name = build_path_from_dentry(source_dentry, page1);
2490 if (IS_ERR(from_name)) {
2491 rc = PTR_ERR(from_name);
2492 goto cifs_rename_exit;
2493 }
2494
2495 to_name = build_path_from_dentry(target_dentry, page2);
2496 if (IS_ERR(to_name)) {
2497 rc = PTR_ERR(to_name);
2498 goto cifs_rename_exit;
2499 }
2500
2501 cifs_close_deferred_file_under_dentry(tcon, from_name);
2502 if (d_inode(target_dentry) != NULL) {
2503 netfs_wait_for_outstanding_io(d_inode(target_dentry));
2504 cifs_close_deferred_file_under_dentry(tcon, to_name);
2505 }
2506
2507 rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
2508 to_name);
2509
2510 if (rc == -EACCES) {
2511 while (retry_count < 3) {
2512 cifs_close_all_deferred_files(tcon);
2513 rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
2514 to_name);
2515 if (rc != -EACCES)
2516 break;
2517 retry_count++;
2518 }
2519 }
2520
2521 /*
2522 * No-replace is the natural behavior for CIFS, so skip unlink hacks.
2523 */
2524 if (flags & RENAME_NOREPLACE)
2525 goto cifs_rename_exit;
2526
2527 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2528 if (rc == -EEXIST && tcon->unix_ext) {
2529 /*
2530 * Are src and dst hardlinks of same inode? We can only tell
2531 * with unix extensions enabled.
2532 */
2533 info_buf_source =
2534 kmalloc_array(2, sizeof(FILE_UNIX_BASIC_INFO),
2535 GFP_KERNEL);
2536 if (info_buf_source == NULL) {
2537 rc = -ENOMEM;
2538 goto cifs_rename_exit;
2539 }
2540
2541 info_buf_target = info_buf_source + 1;
2542 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, from_name,
2543 info_buf_source,
2544 cifs_sb->local_nls,
2545 cifs_remap(cifs_sb));
2546 if (tmprc != 0)
2547 goto unlink_target;
2548
2549 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, to_name,
2550 info_buf_target,
2551 cifs_sb->local_nls,
2552 cifs_remap(cifs_sb));
2553
2554 if (tmprc == 0 && (info_buf_source->UniqueId ==
2555 info_buf_target->UniqueId)) {
2556 /* same file, POSIX says that this is a noop */
2557 rc = 0;
2558 goto cifs_rename_exit;
2559 }
2560 }
2561 /*
2562 * else ... BB we could add the same check for Windows by
2563 * checking the UniqueId via FILE_INTERNAL_INFO
2564 */
2565
2566 unlink_target:
2567 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2568
2569 /* Try unlinking the target dentry if it's not negative */
2570 if (d_really_is_positive(target_dentry) && (rc == -EACCES || rc == -EEXIST)) {
2571 if (d_is_dir(target_dentry))
2572 tmprc = cifs_rmdir(target_dir, target_dentry);
2573 else
2574 tmprc = cifs_unlink(target_dir, target_dentry);
2575 if (tmprc)
2576 goto cifs_rename_exit;
2577 rc = cifs_do_rename(xid, source_dentry, from_name,
2578 target_dentry, to_name);
2579 }
2580
2581 /* force revalidate to go get info when needed */
2582 CIFS_I(source_dir)->time = CIFS_I(target_dir)->time = 0;
2583
2584 cifs_rename_exit:
2585 kfree(info_buf_source);
2586 free_dentry_path(page2);
2587 free_dentry_path(page1);
2588 free_xid(xid);
2589 cifs_put_tlink(tlink);
2590 return rc;
2591 }
2592
2593 static bool
2594 cifs_dentry_needs_reval(struct dentry *dentry)
2595 {
2596 struct inode *inode = d_inode(dentry);
2597 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
2598 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2599 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
2600 struct cached_fid *cfid = NULL;
2601
2602 if (cifs_i->time == 0)
2603 return true;
2604
2605 if (CIFS_CACHE_READ(cifs_i))
2606 return false;
2607
2608 if (!lookupCacheEnabled)
2609 return true;
2610
2611 if (!open_cached_dir_by_dentry(tcon, dentry->d_parent, &cfid)) {
2612 if (cfid->time && cifs_i->time > cfid->time) {
2613 close_cached_dir(cfid);
2614 return false;
2615 }
2616 close_cached_dir(cfid);
2617 }
2618 /*
2619 * depending on inode type, check if attribute caching disabled for
2620 * files or directories
2621 */
2622 if (S_ISDIR(inode->i_mode)) {
2623 if (!cifs_sb->ctx->acdirmax)
2624 return true;
2625 if (!time_in_range(jiffies, cifs_i->time,
2626 cifs_i->time + cifs_sb->ctx->acdirmax))
2627 return true;
2628 } else { /* file */
2629 if (!cifs_sb->ctx->acregmax)
2630 return true;
2631 if (!time_in_range(jiffies, cifs_i->time,
2632 cifs_i->time + cifs_sb->ctx->acregmax))
2633 return true;
2634 }
2635
2636 /* hardlinked files w/ noserverino get "special" treatment */
2637 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
2638 S_ISREG(inode->i_mode) && inode->i_nlink != 1)
2639 return true;
2640
2641 return false;
2642 }
2643
2644 /**
2645 * cifs_wait_bit_killable - helper for functions that are sleeping on bit locks
2646 *
2647 * @key: currently unused
2648 * @mode: the task state to sleep in
2649 */
2650 static int
2651 cifs_wait_bit_killable(struct wait_bit_key *key, int mode)
2652 {
2653 schedule();
2654 if (signal_pending_state(mode, current))
2655 return -ERESTARTSYS;
2656 return 0;
2657 }
2658
2659 int
2660 cifs_revalidate_mapping(struct inode *inode)
2661 {
2662 int rc;
2663 struct cifsInodeInfo *cifs_inode = CIFS_I(inode);
2664 unsigned long *flags = &cifs_inode->flags;
2665 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2666
2667 /* swapfiles are not supposed to be shared */
2668 if (IS_SWAPFILE(inode))
2669 return 0;
2670
2671 rc = wait_on_bit_lock_action(flags, CIFS_INO_LOCK, cifs_wait_bit_killable,
2672 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
2673 if (rc)
2674 return rc;
2675
2676 if (test_and_clear_bit(CIFS_INO_INVALID_MAPPING, flags)) {
2677 /* for cache=singleclient, do not invalidate */
2678 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE)
2679 goto skip_invalidate;
2680
2681 cifs_inode->netfs.zero_point = cifs_inode->netfs.remote_i_size;
2682 rc = filemap_invalidate_inode(inode, true, 0, LLONG_MAX);
2683 if (rc) {
2684 cifs_dbg(VFS, "%s: invalidate inode %p failed with rc %d\n",
2685 __func__, inode, rc);
2686 set_bit(CIFS_INO_INVALID_MAPPING, flags);
2687 }
2688 }
2689
2690 skip_invalidate:
2691 clear_bit_unlock(CIFS_INO_LOCK, flags);
2692 smp_mb__after_atomic();
2693 wake_up_bit(flags, CIFS_INO_LOCK);
2694
2695 return rc;
2696 }
2697
2698 int
2699 cifs_zap_mapping(struct inode *inode)
2700 {
2701 set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(inode)->flags);
2702 return cifs_revalidate_mapping(inode);
2703 }
2704
2705 int cifs_revalidate_file_attr(struct file *filp)
2706 {
2707 int rc = 0;
2708 struct dentry *dentry = file_dentry(filp);
2709 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2710 struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
2711 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2712
2713 if (!cifs_dentry_needs_reval(dentry))
2714 return rc;
2715
2716 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
2717 if (tlink_tcon(cfile->tlink)->unix_ext)
2718 rc = cifs_get_file_info_unix(filp);
2719 else
2720 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
2721 rc = cifs_get_file_info(filp);
2722
2723 return rc;
2724 }
2725
2726 int cifs_revalidate_dentry_attr(struct dentry *dentry)
2727 {
2728 unsigned int xid;
2729 int rc = 0;
2730 struct inode *inode = d_inode(dentry);
2731 struct super_block *sb = dentry->d_sb;
2732 const char *full_path;
2733 void *page;
2734 int count = 0;
2735
2736 if (inode == NULL)
2737 return -ENOENT;
2738
2739 if (!cifs_dentry_needs_reval(dentry))
2740 return rc;
2741
2742 xid = get_xid();
2743
2744 page = alloc_dentry_path();
2745 full_path = build_path_from_dentry(dentry, page);
2746 if (IS_ERR(full_path)) {
2747 rc = PTR_ERR(full_path);
2748 goto out;
2749 }
2750
2751 cifs_dbg(FYI, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time %ld jiffies %ld\n",
2752 full_path, inode, inode->i_count.counter,
2753 dentry, cifs_get_time(dentry), jiffies);
2754
2755 again:
2756 if (cifs_sb_master_tcon(CIFS_SB(sb))->posix_extensions) {
2757 rc = smb311_posix_get_inode_info(&inode, full_path,
2758 NULL, sb, xid);
2759 } else if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext) {
2760 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
2761 } else {
2762 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
2763 xid, NULL);
2764 }
2765 if (rc == -EAGAIN && count++ < 10)
2766 goto again;
2767 out:
2768 free_dentry_path(page);
2769 free_xid(xid);
2770
2771 return rc;
2772 }
2773
2774 int cifs_revalidate_file(struct file *filp)
2775 {
2776 int rc;
2777 struct inode *inode = file_inode(filp);
2778
2779 rc = cifs_revalidate_file_attr(filp);
2780 if (rc)
2781 return rc;
2782
2783 return cifs_revalidate_mapping(inode);
2784 }
2785
2786 /* revalidate a dentry's inode attributes */
2787 int cifs_revalidate_dentry(struct dentry *dentry)
2788 {
2789 int rc;
2790 struct inode *inode = d_inode(dentry);
2791
2792 rc = cifs_revalidate_dentry_attr(dentry);
2793 if (rc)
2794 return rc;
2795
2796 return cifs_revalidate_mapping(inode);
2797 }
2798
2799 int cifs_getattr(struct mnt_idmap *idmap, const struct path *path,
2800 struct kstat *stat, u32 request_mask, unsigned int flags)
2801 {
2802 struct dentry *dentry = path->dentry;
2803 struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
2804 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
2805 struct inode *inode = d_inode(dentry);
2806 int rc;
2807
2808 if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb))))
2809 return -EIO;
2810
2811 /*
2812 * We need to be sure that all dirty pages are written and the server
2813 * has actual ctime, mtime and file length.
2814 */
2815 if ((request_mask & (STATX_CTIME | STATX_MTIME | STATX_SIZE | STATX_BLOCKS)) &&
2816 !CIFS_CACHE_READ(CIFS_I(inode)) &&
2817 inode->i_mapping && inode->i_mapping->nrpages != 0) {
2818 rc = filemap_fdatawait(inode->i_mapping);
2819 if (rc) {
2820 mapping_set_error(inode->i_mapping, rc);
2821 return rc;
2822 }
2823 }
2824
2825 if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_FORCE_SYNC)
2826 CIFS_I(inode)->time = 0; /* force revalidate */
2827
2828 /*
2829 * If the caller doesn't require syncing, only sync if
2830 * necessary (e.g. due to earlier truncate or setattr
2831 * invalidating the cached metadata)
2832 */
2833 if (((flags & AT_STATX_SYNC_TYPE) != AT_STATX_DONT_SYNC) ||
2834 (CIFS_I(inode)->time == 0)) {
2835 rc = cifs_revalidate_dentry_attr(dentry);
2836 if (rc)
2837 return rc;
2838 }
2839
2840 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
2841 stat->blksize = cifs_sb->ctx->bsize;
2842 stat->ino = CIFS_I(inode)->uniqueid;
2843
2844 /* old CIFS Unix Extensions doesn't return create time */
2845 if (CIFS_I(inode)->createtime) {
2846 stat->result_mask |= STATX_BTIME;
2847 stat->btime =
2848 cifs_NTtimeToUnix(cpu_to_le64(CIFS_I(inode)->createtime));
2849 }
2850
2851 stat->attributes_mask |= (STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED);
2852 if (CIFS_I(inode)->cifsAttrs & FILE_ATTRIBUTE_COMPRESSED)
2853 stat->attributes |= STATX_ATTR_COMPRESSED;
2854 if (CIFS_I(inode)->cifsAttrs & FILE_ATTRIBUTE_ENCRYPTED)
2855 stat->attributes |= STATX_ATTR_ENCRYPTED;
2856
2857 /*
2858 * If on a multiuser mount without unix extensions or cifsacl being
2859 * enabled, and the admin hasn't overridden them, set the ownership
2860 * to the fsuid/fsgid of the current process.
2861 */
2862 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
2863 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
2864 !tcon->unix_ext) {
2865 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
2866 stat->uid = current_fsuid();
2867 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
2868 stat->gid = current_fsgid();
2869 }
2870 return 0;
2871 }
2872
2873 int cifs_fiemap(struct inode *inode, struct fiemap_extent_info *fei, u64 start,
2874 u64 len)
2875 {
2876 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
2877 struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_i->netfs.inode.i_sb);
2878 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
2879 struct TCP_Server_Info *server = tcon->ses->server;
2880 struct cifsFileInfo *cfile;
2881 int rc;
2882
2883 if (unlikely(cifs_forced_shutdown(cifs_sb)))
2884 return -EIO;
2885
2886 /*
2887 * We need to be sure that all dirty pages are written as they
2888 * might fill holes on the server.
2889 */
2890 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
2891 inode->i_mapping->nrpages != 0) {
2892 rc = filemap_fdatawait(inode->i_mapping);
2893 if (rc) {
2894 mapping_set_error(inode->i_mapping, rc);
2895 return rc;
2896 }
2897 }
2898
2899 cfile = find_readable_file(cifs_i, false);
2900 if (cfile == NULL)
2901 return -EINVAL;
2902
2903 if (server->ops->fiemap) {
2904 rc = server->ops->fiemap(tcon, cfile, fei, start, len);
2905 cifsFileInfo_put(cfile);
2906 return rc;
2907 }
2908
2909 cifsFileInfo_put(cfile);
2910 return -EOPNOTSUPP;
2911 }
2912
2913 void cifs_setsize(struct inode *inode, loff_t offset)
2914 {
2915 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
2916
2917 spin_lock(&inode->i_lock);
2918 i_size_write(inode, offset);
2919 spin_unlock(&inode->i_lock);
2920
2921 /* Cached inode must be refreshed on truncate */
2922 cifs_i->time = 0;
2923 truncate_pagecache(inode, offset);
2924 }
2925
2926 static int
2927 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
2928 unsigned int xid, const char *full_path, struct dentry *dentry)
2929 {
2930 int rc;
2931 struct cifsFileInfo *open_file;
2932 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2933 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2934 struct tcon_link *tlink = NULL;
2935 struct cifs_tcon *tcon = NULL;
2936 struct TCP_Server_Info *server;
2937
2938 /*
2939 * To avoid spurious oplock breaks from server, in the case of
2940 * inodes that we already have open, avoid doing path based
2941 * setting of file size if we can do it by handle.
2942 * This keeps our caching token (oplock) and avoids timeouts
2943 * when the local oplock break takes longer to flush
2944 * writebehind data than the SMB timeout for the SetPathInfo
2945 * request would allow
2946 */
2947 open_file = find_writable_file(cifsInode, FIND_WR_FSUID_ONLY);
2948 if (open_file) {
2949 tcon = tlink_tcon(open_file->tlink);
2950 server = tcon->ses->server;
2951 if (server->ops->set_file_size)
2952 rc = server->ops->set_file_size(xid, tcon, open_file,
2953 attrs->ia_size, false);
2954 else
2955 rc = -ENOSYS;
2956 cifsFileInfo_put(open_file);
2957 cifs_dbg(FYI, "SetFSize for attrs rc = %d\n", rc);
2958 } else
2959 rc = -EINVAL;
2960
2961 if (!rc)
2962 goto set_size_out;
2963
2964 if (tcon == NULL) {
2965 tlink = cifs_sb_tlink(cifs_sb);
2966 if (IS_ERR(tlink))
2967 return PTR_ERR(tlink);
2968 tcon = tlink_tcon(tlink);
2969 server = tcon->ses->server;
2970 }
2971
2972 /*
2973 * Set file size by pathname rather than by handle either because no
2974 * valid, writeable file handle for it was found or because there was
2975 * an error setting it by handle.
2976 */
2977 if (server->ops->set_path_size)
2978 rc = server->ops->set_path_size(xid, tcon, full_path,
2979 attrs->ia_size, cifs_sb, false, dentry);
2980 else
2981 rc = -ENOSYS;
2982 cifs_dbg(FYI, "SetEOF by path (setattrs) rc = %d\n", rc);
2983
2984 if (tlink)
2985 cifs_put_tlink(tlink);
2986
2987 set_size_out:
2988 if (rc == 0) {
2989 netfs_resize_file(&cifsInode->netfs, attrs->ia_size, true);
2990 cifs_setsize(inode, attrs->ia_size);
2991 /*
2992 * i_blocks is not related to (i_size / i_blksize), but instead
2993 * 512 byte (2**9) size is required for calculating num blocks.
2994 * Until we can query the server for actual allocation size,
2995 * this is best estimate we have for blocks allocated for a file
2996 * Number of blocks must be rounded up so size 1 is not 0 blocks
2997 */
2998 inode->i_blocks = (512 - 1 + attrs->ia_size) >> 9;
2999
3000 /*
3001 * The man page of truncate says if the size changed,
3002 * then the st_ctime and st_mtime fields for the file
3003 * are updated.
3004 */
3005 attrs->ia_ctime = attrs->ia_mtime = current_time(inode);
3006 attrs->ia_valid |= ATTR_CTIME | ATTR_MTIME;
3007 }
3008
3009 return rc;
3010 }
3011
3012 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3013 static int
3014 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
3015 {
3016 int rc;
3017 unsigned int xid;
3018 const char *full_path;
3019 void *page = alloc_dentry_path();
3020 struct inode *inode = d_inode(direntry);
3021 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
3022 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
3023 struct tcon_link *tlink;
3024 struct cifs_tcon *pTcon;
3025 struct cifs_unix_set_info_args *args = NULL;
3026 struct cifsFileInfo *open_file;
3027
3028 cifs_dbg(FYI, "setattr_unix on file %pd attrs->ia_valid=0x%x\n",
3029 direntry, attrs->ia_valid);
3030
3031 xid = get_xid();
3032
3033 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
3034 attrs->ia_valid |= ATTR_FORCE;
3035
3036 rc = setattr_prepare(&nop_mnt_idmap, direntry, attrs);
3037 if (rc < 0)
3038 goto out;
3039
3040 full_path = build_path_from_dentry(direntry, page);
3041 if (IS_ERR(full_path)) {
3042 rc = PTR_ERR(full_path);
3043 goto out;
3044 }
3045
3046 /*
3047 * Attempt to flush data before changing attributes. We need to do
3048 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
3049 * ownership or mode then we may also need to do this. Here, we take
3050 * the safe way out and just do the flush on all setattr requests. If
3051 * the flush returns error, store it to report later and continue.
3052 *
3053 * BB: This should be smarter. Why bother flushing pages that
3054 * will be truncated anyway? Also, should we error out here if
3055 * the flush returns error?
3056 */
3057 rc = filemap_write_and_wait(inode->i_mapping);
3058 if (is_interrupt_error(rc)) {
3059 rc = -ERESTARTSYS;
3060 goto out;
3061 }
3062
3063 mapping_set_error(inode->i_mapping, rc);
3064 rc = 0;
3065
3066 if (attrs->ia_valid & ATTR_SIZE) {
3067 rc = cifs_set_file_size(inode, attrs, xid, full_path, direntry);
3068 if (rc != 0)
3069 goto out;
3070 }
3071
3072 /* skip mode change if it's just for clearing setuid/setgid */
3073 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
3074 attrs->ia_valid &= ~ATTR_MODE;
3075
3076 args = kmalloc(sizeof(*args), GFP_KERNEL);
3077 if (args == NULL) {
3078 rc = -ENOMEM;
3079 goto out;
3080 }
3081
3082 /* set up the struct */
3083 if (attrs->ia_valid & ATTR_MODE)
3084 args->mode = attrs->ia_mode;
3085 else
3086 args->mode = NO_CHANGE_64;
3087
3088 if (attrs->ia_valid & ATTR_UID)
3089 args->uid = attrs->ia_uid;
3090 else
3091 args->uid = INVALID_UID; /* no change */
3092
3093 if (attrs->ia_valid & ATTR_GID)
3094 args->gid = attrs->ia_gid;
3095 else
3096 args->gid = INVALID_GID; /* no change */
3097
3098 if (attrs->ia_valid & ATTR_ATIME)
3099 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
3100 else
3101 args->atime = NO_CHANGE_64;
3102
3103 if (attrs->ia_valid & ATTR_MTIME)
3104 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
3105 else
3106 args->mtime = NO_CHANGE_64;
3107
3108 if (attrs->ia_valid & ATTR_CTIME)
3109 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
3110 else
3111 args->ctime = NO_CHANGE_64;
3112
3113 args->device = 0;
3114 open_file = find_writable_file(cifsInode, FIND_WR_FSUID_ONLY);
3115 if (open_file) {
3116 u16 nfid = open_file->fid.netfid;
3117 u32 npid = open_file->pid;
3118 pTcon = tlink_tcon(open_file->tlink);
3119 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
3120 cifsFileInfo_put(open_file);
3121 } else {
3122 tlink = cifs_sb_tlink(cifs_sb);
3123 if (IS_ERR(tlink)) {
3124 rc = PTR_ERR(tlink);
3125 goto out;
3126 }
3127 pTcon = tlink_tcon(tlink);
3128 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
3129 cifs_sb->local_nls,
3130 cifs_remap(cifs_sb));
3131 cifs_put_tlink(tlink);
3132 }
3133
3134 if (rc)
3135 goto out;
3136
3137 if ((attrs->ia_valid & ATTR_SIZE) &&
3138 attrs->ia_size != i_size_read(inode)) {
3139 truncate_setsize(inode, attrs->ia_size);
3140 netfs_resize_file(&cifsInode->netfs, attrs->ia_size, true);
3141 fscache_resize_cookie(cifs_inode_cookie(inode), attrs->ia_size);
3142 }
3143
3144 setattr_copy(&nop_mnt_idmap, inode, attrs);
3145 mark_inode_dirty(inode);
3146
3147 /* force revalidate when any of these times are set since some
3148 of the fs types (eg ext3, fat) do not have fine enough
3149 time granularity to match protocol, and we do not have a
3150 a way (yet) to query the server fs's time granularity (and
3151 whether it rounds times down).
3152 */
3153 if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
3154 cifsInode->time = 0;
3155 out:
3156 kfree(args);
3157 free_dentry_path(page);
3158 free_xid(xid);
3159 return rc;
3160 }
3161 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3162
3163 static int
3164 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
3165 {
3166 unsigned int xid;
3167 kuid_t uid = INVALID_UID;
3168 kgid_t gid = INVALID_GID;
3169 struct inode *inode = d_inode(direntry);
3170 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
3171 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
3172 struct cifsFileInfo *wfile;
3173 struct cifs_tcon *tcon;
3174 const char *full_path;
3175 void *page = alloc_dentry_path();
3176 int rc = -EACCES;
3177 __u32 dosattr = 0;
3178 __u64 mode = NO_CHANGE_64;
3179 bool posix = cifs_sb_master_tcon(cifs_sb)->posix_extensions;
3180
3181 xid = get_xid();
3182
3183 cifs_dbg(FYI, "setattr on file %pd attrs->ia_valid 0x%x\n",
3184 direntry, attrs->ia_valid);
3185
3186 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
3187 attrs->ia_valid |= ATTR_FORCE;
3188
3189 rc = setattr_prepare(&nop_mnt_idmap, direntry, attrs);
3190 if (rc < 0)
3191 goto cifs_setattr_exit;
3192
3193 full_path = build_path_from_dentry(direntry, page);
3194 if (IS_ERR(full_path)) {
3195 rc = PTR_ERR(full_path);
3196 goto cifs_setattr_exit;
3197 }
3198
3199 /*
3200 * Attempt to flush data before changing attributes. We need to do
3201 * this for ATTR_SIZE and ATTR_MTIME. If the flush of the data
3202 * returns error, store it to report later and continue.
3203 *
3204 * BB: This should be smarter. Why bother flushing pages that
3205 * will be truncated anyway? Also, should we error out here if
3206 * the flush returns error? Do we need to check for ATTR_MTIME_SET flag?
3207 */
3208 if (attrs->ia_valid & (ATTR_MTIME | ATTR_SIZE | ATTR_CTIME)) {
3209 rc = filemap_write_and_wait(inode->i_mapping);
3210 if (is_interrupt_error(rc)) {
3211 rc = -ERESTARTSYS;
3212 goto cifs_setattr_exit;
3213 }
3214 mapping_set_error(inode->i_mapping, rc);
3215 }
3216
3217 rc = 0;
3218
3219 if ((attrs->ia_valid & ATTR_MTIME) &&
3220 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) {
3221 rc = cifs_get_writable_file(cifsInode, FIND_WR_ANY, &wfile);
3222 if (!rc) {
3223 tcon = tlink_tcon(wfile->tlink);
3224 rc = tcon->ses->server->ops->flush(xid, tcon, &wfile->fid);
3225 cifsFileInfo_put(wfile);
3226 if (rc)
3227 goto cifs_setattr_exit;
3228 } else if (rc != -EBADF)
3229 goto cifs_setattr_exit;
3230 else
3231 rc = 0;
3232 }
3233
3234 if (attrs->ia_valid & ATTR_SIZE) {
3235 rc = cifs_set_file_size(inode, attrs, xid, full_path, direntry);
3236 if (rc != 0)
3237 goto cifs_setattr_exit;
3238 }
3239
3240 if (attrs->ia_valid & ATTR_UID)
3241 uid = attrs->ia_uid;
3242
3243 if (attrs->ia_valid & ATTR_GID)
3244 gid = attrs->ia_gid;
3245
3246 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) ||
3247 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)) {
3248 if (uid_valid(uid) || gid_valid(gid)) {
3249 mode = NO_CHANGE_64;
3250 rc = id_mode_to_cifs_acl(inode, full_path, &mode,
3251 uid, gid);
3252 if (rc) {
3253 cifs_dbg(FYI, "%s: Setting id failed with error: %d\n",
3254 __func__, rc);
3255 goto cifs_setattr_exit;
3256 }
3257 }
3258 } else
3259 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
3260 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
3261
3262 /* skip mode change if it's just for clearing setuid/setgid */
3263 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
3264 attrs->ia_valid &= ~ATTR_MODE;
3265
3266 if (attrs->ia_valid & ATTR_MODE) {
3267 mode = attrs->ia_mode;
3268 rc = 0;
3269 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) ||
3270 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) ||
3271 posix) {
3272 rc = id_mode_to_cifs_acl(inode, full_path, &mode,
3273 INVALID_UID, INVALID_GID);
3274 if (rc) {
3275 cifs_dbg(FYI, "%s: Setting ACL failed with error: %d\n",
3276 __func__, rc);
3277 goto cifs_setattr_exit;
3278 }
3279
3280 /*
3281 * In case of CIFS_MOUNT_CIFS_ACL, we cannot support all modes.
3282 * Pick up the actual mode bits that were set.
3283 */
3284 if (mode != attrs->ia_mode)
3285 attrs->ia_mode = mode;
3286 } else
3287 if (((mode & S_IWUGO) == 0) &&
3288 (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
3289
3290 dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
3291
3292 /* fix up mode if we're not using dynperm */
3293 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
3294 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
3295 } else if ((mode & S_IWUGO) &&
3296 (cifsInode->cifsAttrs & ATTR_READONLY)) {
3297
3298 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
3299 /* Attributes of 0 are ignored */
3300 if (dosattr == 0)
3301 dosattr |= ATTR_NORMAL;
3302
3303 /* reset local inode permissions to normal */
3304 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
3305 attrs->ia_mode &= ~(S_IALLUGO);
3306 if (S_ISDIR(inode->i_mode))
3307 attrs->ia_mode |=
3308 cifs_sb->ctx->dir_mode;
3309 else
3310 attrs->ia_mode |=
3311 cifs_sb->ctx->file_mode;
3312 }
3313 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
3314 /* ignore mode change - ATTR_READONLY hasn't changed */
3315 attrs->ia_valid &= ~ATTR_MODE;
3316 }
3317 }
3318
3319 if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
3320 ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
3321 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
3322 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
3323
3324 /* Even if error on time set, no sense failing the call if
3325 the server would set the time to a reasonable value anyway,
3326 and this check ensures that we are not being called from
3327 sys_utimes in which case we ought to fail the call back to
3328 the user when the server rejects the call */
3329 if ((rc) && (attrs->ia_valid &
3330 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
3331 rc = 0;
3332 }
3333
3334 /* do not need local check to inode_check_ok since the server does
3335 that */
3336 if (rc)
3337 goto cifs_setattr_exit;
3338
3339 if ((attrs->ia_valid & ATTR_SIZE) &&
3340 attrs->ia_size != i_size_read(inode)) {
3341 truncate_setsize(inode, attrs->ia_size);
3342 netfs_resize_file(&cifsInode->netfs, attrs->ia_size, true);
3343 fscache_resize_cookie(cifs_inode_cookie(inode), attrs->ia_size);
3344 }
3345
3346 setattr_copy(&nop_mnt_idmap, inode, attrs);
3347 mark_inode_dirty(inode);
3348
3349 cifs_setattr_exit:
3350 free_xid(xid);
3351 free_dentry_path(page);
3352 return rc;
3353 }
3354
3355 int
3356 cifs_setattr(struct mnt_idmap *idmap, struct dentry *direntry,
3357 struct iattr *attrs)
3358 {
3359 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
3360 int rc, retries = 0;
3361 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3362 struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
3363 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3364
3365 if (unlikely(cifs_forced_shutdown(cifs_sb)))
3366 return -EIO;
3367
3368 do {
3369 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
3370 if (pTcon->unix_ext)
3371 rc = cifs_setattr_unix(direntry, attrs);
3372 else
3373 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
3374 rc = cifs_setattr_nounix(direntry, attrs);
3375 retries++;
3376 } while (is_retryable_error(rc) && retries < 2);
3377
3378 /* BB: add cifs_setattr_legacy for really old servers */
3379 return rc;
3380 }
3381