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2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/fs/cifs/readdir.c
....@@ -32,6 +32,7 @@
3232 #include "cifs_debug.h"
3333 #include "cifs_fs_sb.h"
3434 #include "cifsfs.h"
35
+#include "smb2proto.h"
3536 
3637 /*
3738  * To be safe - for UCS to UTF-8 with strings loaded with the rare long
....@@ -52,7 +53,7 @@
5253 			return;
5354 		}
5455 		if (cf->invalidHandle)
55
-			cifs_dbg(FYI, "invalid handle\n");
56
+			cifs_dbg(FYI, "Invalid handle\n");
5657 		if (cf->srch_inf.endOfSearch)
5758 			cifs_dbg(FYI, "end of search\n");
5859 		if (cf->srch_inf.emptyDir)
....@@ -139,16 +140,61 @@
139140 	dput(dentry);
140141 }
141142 
143
+static bool reparse_file_needs_reval(const struct cifs_fattr *fattr)
144
+{
145
+	if (!(fattr->cf_cifsattrs & ATTR_REPARSE))
146
+		return false;
147
+	/*
148
+	 * The DFS tags should be only intepreted by server side as per
149
+	 * MS-FSCC 2.1.2.1, but let's include them anyway.
150
+	 *
151
+	 * Besides, if cf_cifstag is unset (0), then we still need it to be
152
+	 * revalidated to know exactly what reparse point it is.
153
+	 */
154
+	switch (fattr->cf_cifstag) {
155
+	case IO_REPARSE_TAG_DFS:
156
+	case IO_REPARSE_TAG_DFSR:
157
+	case IO_REPARSE_TAG_SYMLINK:
158
+	case IO_REPARSE_TAG_NFS:
159
+	case 0:
160
+		return true;
161
+	}
162
+	return false;
163
+}
164
+
142165 static void
143166 cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
144167 {
145168 	fattr->cf_uid = cifs_sb->mnt_uid;
146169 	fattr->cf_gid = cifs_sb->mnt_gid;
147170 
171
+	/*
172
+	 * The IO_REPARSE_TAG_LX_ tags originally were used by WSL but they
173
+	 * are preferred by the Linux client in some cases since, unlike
174
+	 * the NFS reparse tag (or EAs), they don't require an extra query
175
+	 * to determine which type of special file they represent.
176
+	 * TODO: go through all documented  reparse tags to see if we can
177
+	 * reasonably map some of them to directories vs. files vs. symlinks
178
+	 */
148179 	if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
149180 		fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
150181 		fattr->cf_dtype = DT_DIR;
151
-	} else {
182
+	} else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_SYMLINK) {
183
+		fattr->cf_mode |= S_IFLNK | cifs_sb->mnt_file_mode;
184
+		fattr->cf_dtype = DT_LNK;
185
+	} else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_FIFO) {
186
+		fattr->cf_mode |= S_IFIFO | cifs_sb->mnt_file_mode;
187
+		fattr->cf_dtype = DT_FIFO;
188
+	} else if (fattr->cf_cifstag == IO_REPARSE_TAG_AF_UNIX) {
189
+		fattr->cf_mode |= S_IFSOCK | cifs_sb->mnt_file_mode;
190
+		fattr->cf_dtype = DT_SOCK;
191
+	} else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_CHR) {
192
+		fattr->cf_mode |= S_IFCHR | cifs_sb->mnt_file_mode;
193
+		fattr->cf_dtype = DT_CHR;
194
+	} else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_BLK) {
195
+		fattr->cf_mode |= S_IFBLK | cifs_sb->mnt_file_mode;
196
+		fattr->cf_dtype = DT_BLK;
197
+	} else { /* TODO: should we mark some other reparse points (like DFSR) as directories? */
152198 		fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
153199 		fattr->cf_dtype = DT_REG;
154200 	}
....@@ -158,7 +204,7 @@
158204 	 * is a symbolic link, DFS referral or a reparse point with a direct
159205 	 * access like junctions, deduplicated files, NFS symlinks.
160206 	 */
161
-	if (fattr->cf_cifsattrs & ATTR_REPARSE)
207
+	if (reparse_file_needs_reval(fattr))
162208 		fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
163209 
164210 	/* non-unix readdir doesn't provide nlink */
....@@ -174,7 +220,8 @@
174220 	 * may look wrong since the inodes may not have timed out by the time
175221 	 * "ls" does a stat() call on them.
176222 	 */
177
-	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
223
+	if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) ||
224
+	    (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID))
178225 		fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
179226 
180227 	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL &&
....@@ -194,19 +241,90 @@
194241 	}
195242 }
196243 
244
+/* Fill a cifs_fattr struct with info from SMB_FIND_FILE_POSIX_INFO. */
245
+static void
246
+cifs_posix_to_fattr(struct cifs_fattr *fattr, struct smb2_posix_info *info,
247
+		    struct cifs_sb_info *cifs_sb)
248
+{
249
+	struct smb2_posix_info_parsed parsed;
250
+
251
+	posix_info_parse(info, NULL, &parsed);
252
+
253
+	memset(fattr, 0, sizeof(*fattr));
254
+	fattr->cf_uniqueid = le64_to_cpu(info->Inode);
255
+	fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
256
+	fattr->cf_eof = le64_to_cpu(info->EndOfFile);
257
+
258
+	fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
259
+	fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
260
+	fattr->cf_ctime = cifs_NTtimeToUnix(info->CreationTime);
261
+
262
+	fattr->cf_nlink = le32_to_cpu(info->HardLinks);
263
+	fattr->cf_cifsattrs = le32_to_cpu(info->DosAttributes);
264
+
265
+	/*
266
+	 * Since we set the inode type below we need to mask off
267
+	 * to avoid strange results if bits set above.
268
+	 * XXX: why not make server&client use the type bits?
269
+	 */
270
+	fattr->cf_mode = le32_to_cpu(info->Mode) & ~S_IFMT;
271
+
272
+	cifs_dbg(FYI, "posix fattr: dev %d, reparse %d, mode %o\n",
273
+		 le32_to_cpu(info->DeviceId),
274
+		 le32_to_cpu(info->ReparseTag),
275
+		 le32_to_cpu(info->Mode));
276
+
277
+	if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
278
+		fattr->cf_mode |= S_IFDIR;
279
+		fattr->cf_dtype = DT_DIR;
280
+	} else {
281
+		/*
282
+		 * mark anything that is not a dir as regular
283
+		 * file. special files should have the REPARSE
284
+		 * attribute and will be marked as needing revaluation
285
+		 */
286
+		fattr->cf_mode |= S_IFREG;
287
+		fattr->cf_dtype = DT_REG;
288
+	}
289
+
290
+	if (reparse_file_needs_reval(fattr))
291
+		fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
292
+
293
+	sid_to_id(cifs_sb, &parsed.owner, fattr, SIDOWNER);
294
+	sid_to_id(cifs_sb, &parsed.group, fattr, SIDGROUP);
295
+}
296
+
297
+static void __dir_info_to_fattr(struct cifs_fattr *fattr, const void *info)
298
+{
299
+	const FILE_DIRECTORY_INFO *fi = info;
300
+
301
+	memset(fattr, 0, sizeof(*fattr));
302
+	fattr->cf_cifsattrs = le32_to_cpu(fi->ExtFileAttributes);
303
+	fattr->cf_eof = le64_to_cpu(fi->EndOfFile);
304
+	fattr->cf_bytes = le64_to_cpu(fi->AllocationSize);
305
+	fattr->cf_createtime = le64_to_cpu(fi->CreationTime);
306
+	fattr->cf_atime = cifs_NTtimeToUnix(fi->LastAccessTime);
307
+	fattr->cf_ctime = cifs_NTtimeToUnix(fi->ChangeTime);
308
+	fattr->cf_mtime = cifs_NTtimeToUnix(fi->LastWriteTime);
309
+}
310
+
197311 void
198312 cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
199313 		       struct cifs_sb_info *cifs_sb)
200314 {
201
-	memset(fattr, 0, sizeof(*fattr));
202
-	fattr->cf_cifsattrs = le32_to_cpu(info->ExtFileAttributes);
203
-	fattr->cf_eof = le64_to_cpu(info->EndOfFile);
204
-	fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
205
-	fattr->cf_createtime = le64_to_cpu(info->CreationTime);
206
-	fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
207
-	fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
208
-	fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
315
+	__dir_info_to_fattr(fattr, info);
316
+	cifs_fill_common_info(fattr, cifs_sb);
317
+}
209318 
319
+static void cifs_fulldir_info_to_fattr(struct cifs_fattr *fattr,
320
+				       SEARCH_ID_FULL_DIR_INFO *info,
321
+				       struct cifs_sb_info *cifs_sb)
322
+{
323
+	__dir_info_to_fattr(fattr, info);
324
+
325
+	/* See MS-FSCC 2.4.18 FileIdFullDirectoryInformation */
326
+	if (fattr->cf_cifsattrs & ATTR_REPARSE)
327
+		fattr->cf_cifstag = le32_to_cpu(info->EaSize);
210328 	cifs_fill_common_info(fattr, cifs_sb);
211329 }
212330 
....@@ -264,11 +382,11 @@
264382  */
265383 
266384 static int
267
-initiate_cifs_search(const unsigned int xid, struct file *file)
385
+initiate_cifs_search(const unsigned int xid, struct file *file,
386
+		     char *full_path)
268387 {
269388 	__u16 search_flags;
270389 	int rc = 0;
271
-	char *full_path = NULL;
272390 	struct cifsFileInfo *cifsFile;
273391 	struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
274392 	struct tcon_link *tlink = NULL;
....@@ -304,12 +422,6 @@
304422 	cifsFile->invalidHandle = true;
305423 	cifsFile->srch_inf.endOfSearch = false;
306424 
307
-	full_path = build_path_from_dentry(file_dentry(file));
308
-	if (full_path == NULL) {
309
-		rc = -ENOMEM;
310
-		goto error_exit;
311
-	}
312
-
313425 	cifs_dbg(FYI, "Full path: %s start at: %lld\n", full_path, file->f_pos);
314426 
315427 ffirst_retry:
....@@ -318,6 +430,8 @@
318430 	/* if (cap_unix(tcon->ses) { */
319431 	if (tcon->unix_ext)
320432 		cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
433
+	else if (tcon->posix_extensions)
434
+		cifsFile->srch_inf.info_level = SMB_FIND_FILE_POSIX_INFO;
321435 	else if ((tcon->ses->capabilities &
322436 		  tcon->ses->server->vals->cap_nt_find) == 0) {
323437 		cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
....@@ -346,7 +460,6 @@
346460 		goto ffirst_retry;
347461 	}
348462 error_exit:
349
-	kfree(full_path);
350463 	cifs_put_tlink(tlink);
351464 	return rc;
352465 }
....@@ -380,7 +493,7 @@
380493 		u32 next_offset = le32_to_cpu(pDirInfo->NextEntryOffset);
381494 
382495 		if (old_entry + next_offset < old_entry) {
383
-			cifs_dbg(VFS, "invalid offset %u\n", next_offset);
496
+			cifs_dbg(VFS, "Invalid offset %u\n", next_offset);
384497 			return NULL;
385498 		}
386499 		new_entry = old_entry + next_offset;
....@@ -409,6 +522,23 @@
409522 	u32		resume_key;
410523 	u64		ino;
411524 };
525
+
526
+static void cifs_fill_dirent_posix(struct cifs_dirent *de,
527
+				   const struct smb2_posix_info *info)
528
+{
529
+	struct smb2_posix_info_parsed parsed;
530
+
531
+	/* payload should have already been checked at this point */
532
+	if (posix_info_parse(info, NULL, &parsed) < 0) {
533
+		cifs_dbg(VFS, "Invalid POSIX info payload\n");
534
+		return;
535
+	}
536
+
537
+	de->name = parsed.name;
538
+	de->namelen = parsed.name_len;
539
+	de->resume_key = info->Ignored;
540
+	de->ino = le64_to_cpu(info->Inode);
541
+}
412542 
413543 static void cifs_fill_dirent_unix(struct cifs_dirent *de,
414544 		const FILE_UNIX_INFO *info, bool is_unicode)
....@@ -470,6 +600,9 @@
470600 	memset(de, 0, sizeof(*de));
471601 
472602 	switch (level) {
603
+	case SMB_FIND_FILE_POSIX_INFO:
604
+		cifs_fill_dirent_posix(de, info);
605
+		break;
473606 	case SMB_FIND_FILE_UNIX:
474607 		cifs_fill_dirent_unix(de, info, is_unicode);
475608 		break;
....@@ -570,7 +703,8 @@
570703  */
571704 static int
572705 find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, loff_t pos,
573
-		struct file *file, char **current_entry, int *num_to_ret)
706
+		struct file *file, char *full_path,
707
+		char **current_entry, int *num_to_ret)
574708 {
575709 	__u16 search_flags;
576710 	int rc = 0;
....@@ -623,7 +757,7 @@
623757 						ntwrk_buf_start);
624758 			cfile->srch_inf.ntwrk_buf_start = NULL;
625759 		}
626
-		rc = initiate_cifs_search(xid, file);
760
+		rc = initiate_cifs_search(xid, file, full_path);
627761 		if (rc) {
628762 			cifs_dbg(FYI, "error %d reinitiating a search on rewind\n",
629763 				 rc);
....@@ -745,6 +879,11 @@
745879 	}
746880 
747881 	switch (file_info->srch_inf.info_level) {
882
+	case SMB_FIND_FILE_POSIX_INFO:
883
+		cifs_posix_to_fattr(&fattr,
884
+				    (struct smb2_posix_info *)find_entry,
885
+				    cifs_sb);
886
+		break;
748887 	case SMB_FIND_FILE_UNIX:
749888 		cifs_unix_basic_to_fattr(&fattr,
750889 					 &((FILE_UNIX_INFO *)find_entry)->basic,
....@@ -754,6 +893,11 @@
754893 		cifs_std_info_to_fattr(&fattr,
755894 				       (FIND_FILE_STANDARD_INFO *)find_entry,
756895 				       cifs_sb);
896
+		break;
897
+	case SMB_FIND_FILE_ID_FULL_DIR_INFO:
898
+		cifs_fulldir_info_to_fattr(&fattr,
899
+					   (SEARCH_ID_FULL_DIR_INFO *)find_entry,
900
+					   cifs_sb);
757901 		break;
758902 	default:
759903 		cifs_dir_info_to_fattr(&fattr,
....@@ -797,15 +941,22 @@
797941 	char *tmp_buf = NULL;
798942 	char *end_of_smb;
799943 	unsigned int max_len;
944
+	char *full_path = NULL;
800945 
801946 	xid = get_xid();
947
+
948
+	full_path = build_path_from_dentry(file_dentry(file));
949
+	if (full_path == NULL) {
950
+		rc = -ENOMEM;
951
+		goto rddir2_exit;
952
+	}
802953 
803954 	/*
804955 	 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
805956 	 * '..'. Otherwise we won't be able to notify VFS in case of failure.
806957 	 */
807958 	if (file->private_data == NULL) {
808
-		rc = initiate_cifs_search(xid, file);
959
+		rc = initiate_cifs_search(xid, file, full_path);
809960 		cifs_dbg(FYI, "initiate cifs search rc %d\n", rc);
810961 		if (rc)
811962 			goto rddir2_exit;
....@@ -832,15 +983,15 @@
832983 	} */
833984 
834985 	tcon = tlink_tcon(cifsFile->tlink);
835
-	rc = find_cifs_entry(xid, tcon, ctx->pos, file, &current_entry,
836
-			     &num_to_fill);
986
+	rc = find_cifs_entry(xid, tcon, ctx->pos, file, full_path,
987
+			     &current_entry, &num_to_fill);
837988 	if (rc) {
838989 		cifs_dbg(FYI, "fce error %d\n", rc);
839990 		goto rddir2_exit;
840991 	} else if (current_entry != NULL) {
841992 		cifs_dbg(FYI, "entry %lld found\n", ctx->pos);
842993 	} else {
843
-		cifs_dbg(FYI, "could not find entry\n");
994
+		cifs_dbg(FYI, "Could not find entry\n");
844995 		goto rddir2_exit;
845996 	}
846997 	cifs_dbg(FYI, "loop through %d times filling dir for net buf %p\n",
....@@ -891,6 +1042,7 @@
8911042 	kfree(tmp_buf);
8921043 
8931044 rddir2_exit:
1045
+	kfree(full_path);
8941046 	free_xid(xid);
8951047 	return rc;
8961048 }