add new system file

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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/cifs/smb1ops.c
..
..
@@ -1,20 +1,8 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
1
2
 /*
2
3
  *  SMB1 (CIFS) version specific operations
3
4
  *
4
5
  *  Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
5
- *
6
- *  This library is free software; you can redistribute it and/or modify
7
- *  it under the terms of the GNU General Public License v2 as published
8
- *  by the Free Software Foundation.
9
- *
10
- *  This library is distributed in the hope that it will be useful,
11
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
12
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
13
- *  the GNU Lesser General Public License for more details.
14
- *
15
- *  You should have received a copy of the GNU Lesser General Public License
16
- *  along with this library; if not, write to the Free Software
17
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
6
  */
19
7
 
20
8
 #include <linux/pagemap.h>
..
..
@@ -117,11 +105,11 @@
117
105
 }
118
106
 
119
107
 static void
120
-cifs_add_credits(struct TCP_Server_Info *server, const unsigned int add,
121
-		 const int optype)
108
+cifs_add_credits(struct TCP_Server_Info *server,
109
+		 const struct cifs_credits *credits, const int optype)
122
110
 {
123
111
 	spin_lock(&server->req_lock);
124
-	server->credits += add;
112
+	server->credits += credits->value;
125
113
 	server->in_flight--;
126
114
 	spin_unlock(&server->req_lock);
127
115
 	wake_up(&server->request_q);
..
..
@@ -259,7 +247,7 @@
259
247
 	/* check for plausible wct, bcc and t2 data and parm sizes */
260
248
 	/* check for parm and data offset going beyond end of smb */
261
249
 	if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
262
-		cifs_dbg(FYI, "invalid transact2 word count\n");
250
+		cifs_dbg(FYI, "Invalid transact2 word count\n");
263
251
 		return -EINVAL;
264
252
 	}
265
253
 
..
..
@@ -516,7 +504,8 @@
516
504
 }
517
505
 
518
506
 static void
519
-cifs_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
507
+cifs_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon,
508
+	      struct cifs_sb_info *cifs_sb)
520
509
 {
521
510
 	CIFSSMBQFSDeviceInfo(xid, tcon);
522
511
 	CIFSSMBQFSAttributeInfo(xid, tcon);
..
..
@@ -577,7 +566,7 @@
577
566
 		oparms.tcon = tcon;
578
567
 		oparms.cifs_sb = cifs_sb;
579
568
 		oparms.desired_access = FILE_READ_ATTRIBUTES;
580
-		oparms.create_options = 0;
569
+		oparms.create_options = cifs_create_options(cifs_sb, 0);
581
570
 		oparms.disposition = FILE_OPEN;
582
571
 		oparms.path = full_path;
583
572
 		oparms.fid = &fid;
..
..
@@ -699,7 +688,7 @@
699
688
 	dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
700
689
 	info.Attributes = cpu_to_le32(dosattrs);
701
690
 	rc = CIFSSMBSetPathInfo(xid, tcon, full_path, &info, cifs_sb->local_nls,
702
-				cifs_remap(cifs_sb));
691
+				cifs_sb);
703
692
 	if (rc == 0)
704
693
 		cifsInode->cifsAttrs = dosattrs;
705
694
 }
..
..
@@ -777,7 +766,7 @@
777
766
 	struct cifs_tcon *tcon;
778
767
 
779
768
 	/* if the file is already open for write, just use that fileid */
780
-	open_file = find_writable_file(cinode, true);
769
+	open_file = find_writable_file(cinode, FIND_WR_FSUID_ONLY);
781
770
 	if (open_file) {
782
771
 		fid.netfid = open_file->fid.netfid;
783
772
 		netpid = open_file->pid;
..
..
@@ -794,7 +783,7 @@
794
783
 	tcon = tlink_tcon(tlink);
795
784
 
796
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 	rc = CIFSSMBSetPathInfo(xid, tcon, full_path, buf, cifs_sb->local_nls,
797
-				cifs_remap(cifs_sb));
786
+				cifs_sb);
798
787
 	if (rc == 0) {
799
788
 		cinode->cifsAttrs = le32_to_cpu(buf->Attributes);
800
789
 		goto out;
..
..
@@ -805,7 +794,7 @@
805
794
 	oparms.tcon = tcon;
806
795
 	oparms.cifs_sb = cifs_sb;
807
796
 	oparms.desired_access = SYNCHRONIZE | FILE_WRITE_ATTRIBUTES;
808
-	oparms.create_options = CREATE_NOT_DIR;
797
+	oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
809
798
 	oparms.disposition = FILE_OPEN;
810
799
 	oparms.path = full_path;
811
800
 	oparms.fid = &fid;
..
..
@@ -884,7 +873,7 @@
884
873
 
885
874
 static int
886
875
 cifs_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
887
-	     struct kstatfs *buf)
876
+	     struct cifs_sb_info *cifs_sb, struct kstatfs *buf)
888
877
 {
889
878
 	int rc = -EOPNOTSUPP;
890
879
 
..
..
@@ -930,19 +919,18 @@
930
919
 {
931
920
 #ifdef CONFIG_CIFS_DFS_UPCALL
932
921
 	int rc;
933
-	unsigned int num_referrals = 0;
934
-	struct dfs_info3_param *referrals = NULL;
922
+	struct dfs_info3_param referral = {0};
935
923
 
936
-	rc = get_dfs_path(xid, tcon->ses, searchName, nls_codepage,
937
-			  &num_referrals, &referrals, 0);
924
+	rc = get_dfs_path(xid, tcon->ses, searchName, nls_codepage, &referral,
925
+			  0);
938
926
 
939
-	if (!rc && num_referrals > 0) {
940
-		*symlinkinfo = kstrndup(referrals->node_name,
941
-					strlen(referrals->node_name),
927
+	if (!rc) {
928
+		*symlinkinfo = kstrndup(referral.node_name,
929
+					strlen(referral.node_name),
942
930
 					GFP_KERNEL);
931
+		free_dfs_info_param(&referral);
943
932
 		if (!*symlinkinfo)
944
933
 			rc = -ENOMEM;
945
-		free_dfs_info_array(referrals, num_referrals);
946
934
 	}
947
935
 	return rc;
948
936
 #else /* No DFS support */
..
..
@@ -952,8 +940,8 @@
952
940
 
953
941
 static int
954
942
 cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
955
-		   const char *full_path, char **target_path,
956
-		   struct cifs_sb_info *cifs_sb)
943
+		   struct cifs_sb_info *cifs_sb, const char *full_path,
944
+		   char **target_path, bool is_reparse_point)
957
945
 {
958
946
 	int rc;
959
947
 	int oplock = 0;
..
..
@@ -961,6 +949,11 @@
961
949
 	struct cifs_open_parms oparms;
962
950
 
963
951
 	cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
952
+
953
+	if (is_reparse_point) {
954
+		cifs_dbg(VFS, "reparse points not handled for SMB1 symlinks\n");
955
+		return -EOPNOTSUPP;
956
+	}
964
957
 
965
958
 	/* Check for unix extensions */
966
959
 	if (cap_unix(tcon->ses)) {
..
..
@@ -978,7 +971,8 @@
978
971
 	oparms.tcon = tcon;
979
972
 	oparms.cifs_sb = cifs_sb;
980
973
 	oparms.desired_access = FILE_READ_ATTRIBUTES;
981
-	oparms.create_options = OPEN_REPARSE_POINT;
974
+	oparms.create_options = cifs_create_options(cifs_sb,
975
+						    OPEN_REPARSE_POINT);
982
976
 	oparms.disposition = FILE_OPEN;
983
977
 	oparms.path = full_path;
984
978
 	oparms.fid = &fid;
..
..
@@ -1028,6 +1022,128 @@
1028
1022
 
1029
1023
 	return false;
1030
1024
 }
1025
+
1026
+static int
1027
+cifs_make_node(unsigned int xid, struct inode *inode,
1028
+	       struct dentry *dentry, struct cifs_tcon *tcon,
1029
+	       char *full_path, umode_t mode, dev_t dev)
1030
+{
1031
+	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1032
+	struct inode *newinode = NULL;
1033
+	int rc = -EPERM;
1034
+	FILE_ALL_INFO *buf = NULL;
1035
+	struct cifs_io_parms io_parms;
1036
+	__u32 oplock = 0;
1037
+	struct cifs_fid fid;
1038
+	struct cifs_open_parms oparms;
1039
+	unsigned int bytes_written;
1040
+	struct win_dev *pdev;
1041
+	struct kvec iov[2];
1042
+
1043
+	if (tcon->unix_ext) {
1044
+		/*
1045
+		 * SMB1 Unix Extensions: requires server support but
1046
+		 * works with all special files
1047
+		 */
1048
+		struct cifs_unix_set_info_args args = {
1049
+			.mode	= mode & ~current_umask(),
1050
+			.ctime	= NO_CHANGE_64,
1051
+			.atime	= NO_CHANGE_64,
1052
+			.mtime	= NO_CHANGE_64,
1053
+			.device	= dev,
1054
+		};
1055
+		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1056
+			args.uid = current_fsuid();
1057
+			args.gid = current_fsgid();
1058
+		} else {
1059
+			args.uid = INVALID_UID; /* no change */
1060
+			args.gid = INVALID_GID; /* no change */
1061
+		}
1062
+		rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
1063
+					    cifs_sb->local_nls,
1064
+					    cifs_remap(cifs_sb));
1065
+		if (rc)
1066
+			goto out;
1067
+
1068
+		rc = cifs_get_inode_info_unix(&newinode, full_path,
1069
+					      inode->i_sb, xid);
1070
+
1071
+		if (rc == 0)
1072
+			d_instantiate(dentry, newinode);
1073
+		goto out;
1074
+	}
1075
+
1076
+	/*
1077
+	 * SMB1 SFU emulation: should work with all servers, but only
1078
+	 * support block and char device (no socket & fifo)
1079
+	 */
1080
+	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
1081
+		goto out;
1082
+
1083
+	if (!S_ISCHR(mode) && !S_ISBLK(mode))
1084
+		goto out;
1085
+
1086
+	cifs_dbg(FYI, "sfu compat create special file\n");
1087
+
1088
+	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
1089
+	if (buf == NULL) {
1090
+		rc = -ENOMEM;
1091
+		goto out;
1092
+	}
1093
+
1094
+	oparms.tcon = tcon;
1095
+	oparms.cifs_sb = cifs_sb;
1096
+	oparms.desired_access = GENERIC_WRITE;
1097
+	oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR |
1098
+						    CREATE_OPTION_SPECIAL);
1099
+	oparms.disposition = FILE_CREATE;
1100
+	oparms.path = full_path;
1101
+	oparms.fid = &fid;
1102
+	oparms.reconnect = false;
1103
+
1104
+	if (tcon->ses->server->oplocks)
1105
+		oplock = REQ_OPLOCK;
1106
+	else
1107
+		oplock = 0;
1108
+	rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
1109
+	if (rc)
1110
+		goto out;
1111
+
1112
+	/*
1113
+	 * BB Do not bother to decode buf since no local inode yet to put
1114
+	 * timestamps in, but we can reuse it safely.
1115
+	 */
1116
+
1117
+	pdev = (struct win_dev *)buf;
1118
+	io_parms.pid = current->tgid;
1119
+	io_parms.tcon = tcon;
1120
+	io_parms.offset = 0;
1121
+	io_parms.length = sizeof(struct win_dev);
1122
+	iov[1].iov_base = buf;
1123
+	iov[1].iov_len = sizeof(struct win_dev);
1124
+	if (S_ISCHR(mode)) {
1125
+		memcpy(pdev->type, "IntxCHR", 8);
1126
+		pdev->major = cpu_to_le64(MAJOR(dev));
1127
+		pdev->minor = cpu_to_le64(MINOR(dev));
1128
+		rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
1129
+							&bytes_written, iov, 1);
1130
+	} else if (S_ISBLK(mode)) {
1131
+		memcpy(pdev->type, "IntxBLK", 8);
1132
+		pdev->major = cpu_to_le64(MAJOR(dev));
1133
+		pdev->minor = cpu_to_le64(MINOR(dev));
1134
+		rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
1135
+							&bytes_written, iov, 1);
1136
+	}
1137
+	tcon->ses->server->ops->close(xid, tcon, &fid);
1138
+	d_drop(dentry);
1139
+
1140
+	/* FIXME: add code here to set EAs */
1141
+out:
1142
+	kfree(buf);
1143
+	return rc;
1144
+}
1145
+
1146
+
1031
1147
 
1032
1148
 struct smb_version_operations smb1_operations = {
1033
1149
 	.send_cancel = send_nt_cancel,
..
..
@@ -1107,15 +1223,15 @@
1107
1223
 	.query_all_EAs = CIFSSMBQAllEAs,
1108
1224
 	.set_EA = CIFSSMBSetEA,
1109
1225
 #endif /* CIFS_XATTR */
1110
-#ifdef CONFIG_CIFS_ACL
1111
1226
 	.get_acl = get_cifs_acl,
1112
1227
 	.get_acl_by_fid = get_cifs_acl_by_fid,
1113
1228
 	.set_acl = set_cifs_acl,
1114
-#endif /* CIFS_ACL */
1229
+	.make_node = cifs_make_node,
1115
1230
 };
1116
1231
 
1117
1232
 struct smb_version_values smb1_values = {
1118
1233
 	.version_string = SMB1_VERSION_STRING,
1234
+	.protocol_id = SMB10_PROT_ID,
1119
1235
 	.large_lock_type = LOCKING_ANDX_LARGE_FILES,
1120
1236
 	.exclusive_lock_type = 0,
1121
1237
 	.shared_lock_type = LOCKING_ANDX_SHARED_LOCK,