Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 239 insertions, 0 deletions

diff --git a/fs/hfsplus/options.c b/fs/hfsplus/options.c
new file mode 100644
index 000000000..047e05c57
--- /dev/null
+++ b/fs/hfsplus/options.c
@@ -0,0 +1,239 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  linux/fs/hfsplus/options.c
+ *
+ * Copyright (C) 2001
+ * Brad Boyer (flar@allandria.com)
+ * (C) 2003 Ardis Technologies <roman@ardistech.com>
+ *
+ * Option parsing
+ */
+
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/parser.h>
+#include <linux/nls.h>
+#include <linux/mount.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include "hfsplus_fs.h"
+
+enum {
+	opt_creator, opt_type,
+	opt_umask, opt_uid, opt_gid,
+	opt_part, opt_session, opt_nls,
+	opt_nodecompose, opt_decompose,
+	opt_barrier, opt_nobarrier,
+	opt_force, opt_err
+};
+
+static const match_table_t tokens = {
+	{ opt_creator, "creator=%s" },
+	{ opt_type, "type=%s" },
+	{ opt_umask, "umask=%o" },
+	{ opt_uid, "uid=%u" },
+	{ opt_gid, "gid=%u" },
+	{ opt_part, "part=%u" },
+	{ opt_session, "session=%u" },
+	{ opt_nls, "nls=%s" },
+	{ opt_decompose, "decompose" },
+	{ opt_nodecompose, "nodecompose" },
+	{ opt_barrier, "barrier" },
+	{ opt_nobarrier, "nobarrier" },
+	{ opt_force, "force" },
+	{ opt_err, NULL }
+};
+
+/* Initialize an options object to reasonable defaults */
+void hfsplus_fill_defaults(struct hfsplus_sb_info *opts)
+{
+	if (!opts)
+		return;
+
+	opts->creator = HFSPLUS_DEF_CR_TYPE;
+	opts->type = HFSPLUS_DEF_CR_TYPE;
+	opts->umask = current_umask();
+	opts->uid = current_uid();
+	opts->gid = current_gid();
+	opts->part = -1;
+	opts->session = -1;
+}
+
+/* convert a "four byte character" to a 32 bit int with error checks */
+static inline int match_fourchar(substring_t *arg, u32 *result)
+{
+	if (arg->to - arg->from != 4)
+		return -EINVAL;
+	memcpy(result, arg->from, 4);
+	return 0;
+}
+
+int hfsplus_parse_options_remount(char *input, int *force)
+{
+	char *p;
+	substring_t args[MAX_OPT_ARGS];
+	int token;
+
+	if (!input)
+		return 1;
+
+	while ((p = strsep(&input, ",")) != NULL) {
+		if (!*p)
+			continue;
+
+		token = match_token(p, tokens, args);
+		switch (token) {
+		case opt_force:
+			*force = 1;
+			break;
+		default:
+			break;
+		}
+	}
+
+	return 1;
+}
+
+/* Parse options from mount. Returns 0 on failure */
+/* input is the options passed to mount() as a string */
+int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi)
+{
+	char *p;
+	substring_t args[MAX_OPT_ARGS];
+	int tmp, token;
+
+	if (!input)
+		goto done;
+
+	while ((p = strsep(&input, ",")) != NULL) {
+		if (!*p)
+			continue;
+
+		token = match_token(p, tokens, args);
+		switch (token) {
+		case opt_creator:
+			if (match_fourchar(&args[0], &sbi->creator)) {
+				pr_err("creator requires a 4 character value\n");
+				return 0;
+			}
+			break;
+		case opt_type:
+			if (match_fourchar(&args[0], &sbi->type)) {
+				pr_err("type requires a 4 character value\n");
+				return 0;
+			}
+			break;
+		case opt_umask:
+			if (match_octal(&args[0], &tmp)) {
+				pr_err("umask requires a value\n");
+				return 0;
+			}
+			sbi->umask = (umode_t)tmp;
+			break;
+		case opt_uid:
+			if (match_int(&args[0], &tmp)) {
+				pr_err("uid requires an argument\n");
+				return 0;
+			}
+			sbi->uid = make_kuid(current_user_ns(), (uid_t)tmp);
+			if (!uid_valid(sbi->uid)) {
+				pr_err("invalid uid specified\n");
+				return 0;
+			}
+			break;
+		case opt_gid:
+			if (match_int(&args[0], &tmp)) {
+				pr_err("gid requires an argument\n");
+				return 0;
+			}
+			sbi->gid = make_kgid(current_user_ns(), (gid_t)tmp);
+			if (!gid_valid(sbi->gid)) {
+				pr_err("invalid gid specified\n");
+				return 0;
+			}
+			break;
+		case opt_part:
+			if (match_int(&args[0], &sbi->part)) {
+				pr_err("part requires an argument\n");
+				return 0;
+			}
+			break;
+		case opt_session:
+			if (match_int(&args[0], &sbi->session)) {
+				pr_err("session requires an argument\n");
+				return 0;
+			}
+			break;
+		case opt_nls:
+			if (sbi->nls) {
+				pr_err("unable to change nls mapping\n");
+				return 0;
+			}
+			p = match_strdup(&args[0]);
+			if (p)
+				sbi->nls = load_nls(p);
+			if (!sbi->nls) {
+				pr_err("unable to load nls mapping \"%s\"\n",
+				       p);
+				kfree(p);
+				return 0;
+			}
+			kfree(p);
+			break;
+		case opt_decompose:
+			clear_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
+			break;
+		case opt_nodecompose:
+			set_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
+			break;
+		case opt_barrier:
+			clear_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
+			break;
+		case opt_nobarrier:
+			set_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags);
+			break;
+		case opt_force:
+			set_bit(HFSPLUS_SB_FORCE, &sbi->flags);
+			break;
+		default:
+			return 0;
+		}
+	}
+
+done:
+	if (!sbi->nls) {
+		/* try utf8 first, as this is the old default behaviour */
+		sbi->nls = load_nls("utf8");
+		if (!sbi->nls)
+			sbi->nls = load_nls_default();
+		if (!sbi->nls)
+			return 0;
+	}
+
+	return 1;
+}
+
+int hfsplus_show_options(struct seq_file *seq, struct dentry *root)
+{
+	struct hfsplus_sb_info *sbi = HFSPLUS_SB(root->d_sb);
+
+	if (sbi->creator != HFSPLUS_DEF_CR_TYPE)
+		seq_show_option_n(seq, "creator", (char *)&sbi->creator, 4);
+	if (sbi->type != HFSPLUS_DEF_CR_TYPE)
+		seq_show_option_n(seq, "type", (char *)&sbi->type, 4);
+	seq_printf(seq, ",umask=%o,uid=%u,gid=%u", sbi->umask,
+			from_kuid_munged(&init_user_ns, sbi->uid),
+			from_kgid_munged(&init_user_ns, sbi->gid));
+	if (sbi->part >= 0)
+		seq_printf(seq, ",part=%u", sbi->part);
+	if (sbi->session >= 0)
+		seq_printf(seq, ",session=%u", sbi->session);
+	if (sbi->nls)
+		seq_printf(seq, ",nls=%s", sbi->nls->charset);
+	if (test_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags))
+		seq_puts(seq, ",nodecompose");
+	if (test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
+		seq_puts(seq, ",nobarrier");
+	return 0;
+}