[PATCH v3 4/5] mkfs: hook up suboption parsing to ini files

[Dave Chinner <david@fromorbit.com>]

From: Dave Chinner <dchinner@redhat.com>

Now we have the config file parsing hooked up and feeding in
parameters to mkfs, wire the parameters up to the existing CLI
option parsing functions. THis gives the config file exactly the
same capabilities and constraints as the command line option
specification.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
---
 mkfs/xfs_mkfs.c | 94 +++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 79 insertions(+), 15 deletions(-)

diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c
index 829f0383b602..635a36f393b7 100644
--- a/mkfs/xfs_mkfs.c
+++ b/mkfs/xfs_mkfs.c
@@ -143,6 +143,12 @@ enum {
  * name MANDATORY
  *   Name is a single char, e.g., for '-d file', name is 'd'.
  *
+ * ini_section MANDATORY
+ *   This field is required to connect each opt_params (that is to say, each
+ *   option class) to a section in the config file. The only option class this
+ *   is not required for is the config file specification class itself.
+ *   The section name is a string, not longer than MAX_INI_NAME_LEN.
+ *
  * subopts MANDATORY
  *   Subopts is a list of strings naming suboptions. In the example above,
  *   it would contain "file". The last entry of this list has to be NULL.
@@ -201,6 +207,8 @@ enum {
  */
 struct opt_params {
 	const char	name;
+#define MAX_INI_NAME_LEN	32
+	const char	ini_section[MAX_INI_NAME_LEN];
 	const char	*subopts[MAX_SUBOPTS];
 
 	struct subopt_param {
@@ -228,6 +236,7 @@ static struct opt_params sopts;
 
 static struct opt_params bopts = {
 	.name = 'b',
+	.ini_section = "block",
 	.subopts = {
 		[B_SIZE] = "size",
 	},
@@ -267,6 +276,7 @@ static struct opt_params copts = {
 
 static struct opt_params dopts = {
 	.name = 'd',
+	.ini_section = "data",
 	.subopts = {
 		[D_AGCOUNT] = "agcount",
 		[D_FILE] = "file",
@@ -411,6 +421,7 @@ static struct opt_params dopts = {
 
 static struct opt_params iopts = {
 	.name = 'i',
+	.ini_section = "inode",
 	.subopts = {
 		[I_ALIGN] = "align",
 		[I_MAXPCT] = "maxpct",
@@ -472,6 +483,7 @@ static struct opt_params iopts = {
 
 static struct opt_params lopts = {
 	.name = 'l',
+	.ini_section = "log",
 	.subopts = {
 		[L_AGNUM] = "agnum",
 		[L_INTERNAL] = "internal",
@@ -571,6 +583,7 @@ static struct opt_params lopts = {
 
 static struct opt_params nopts = {
 	.name = 'n',
+	.ini_section = "naming",
 	.subopts = {
 		[N_SIZE] = "size",
 		[N_VERSION] = "version",
@@ -602,6 +615,7 @@ static struct opt_params nopts = {
 
 static struct opt_params ropts = {
 	.name = 'r',
+	.ini_section = "realtime",
 	.subopts = {
 		[R_EXTSIZE] = "extsize",
 		[R_SIZE] = "size",
@@ -652,6 +666,7 @@ static struct opt_params ropts = {
 
 static struct opt_params sopts = {
 	.name = 's',
+	.ini_section = "sector",
 	.subopts = {
 		[S_SIZE] = "size",
 		[S_SECTSIZE] = "sectsize",
@@ -682,6 +697,7 @@ static struct opt_params sopts = {
 
 static struct opt_params mopts = {
 	.name = 'm',
+	.ini_section = "metadata",
 	.subopts = {
 		[M_CRC] = "crc",
 		[M_FINOBT] = "finobt",
@@ -982,6 +998,17 @@ unknown(
 	usage();
 }
 
+static void
+invalid_cfgfile_opt(
+	const char	*filename,
+	const char	*section,
+	const char	*name,
+	const char	*value)
+{
+	fprintf(stderr, _("%s: invalid config file option: [%s]:%s=%s\n"),
+		filename, section, name, value);
+}
+
 static void
 check_device_type(
 	const char	*name,
@@ -1696,23 +1723,22 @@ sector_opts_parser(
 }
 
 static struct subopts {
-	char		opt;
 	struct opt_params *opts;
 	int		(*parser)(struct opt_params	*opts,
 				  int			subopt,
 				  const char		*value,
 				  struct cli_params	*cli);
 } subopt_tab[] = {
-	{ 'b', &bopts, block_opts_parser },
-	{ 'c', &copts, cfgfile_opts_parser },
-	{ 'd', &dopts, data_opts_parser },
-	{ 'i', &iopts, inode_opts_parser },
-	{ 'l', &lopts, log_opts_parser },
-	{ 'm', &mopts, meta_opts_parser },
-	{ 'n', &nopts, naming_opts_parser },
-	{ 'r', &ropts, rtdev_opts_parser },
-	{ 's', &sopts, sector_opts_parser },
-	{ '\0', NULL, NULL },
+	{ &bopts, block_opts_parser },
+	{ &copts, cfgfile_opts_parser },
+	{ &dopts, data_opts_parser },
+	{ &iopts, inode_opts_parser },
+	{ &lopts, log_opts_parser },
+	{ &mopts, meta_opts_parser },
+	{ &nopts, naming_opts_parser },
+	{ &ropts, rtdev_opts_parser },
+	{ &sopts, sector_opts_parser },
+	{ NULL, NULL },
 };
 
 static void
@@ -1726,7 +1752,7 @@ parse_subopts(
 	int		ret = 0;
 
 	while (sop->opts) {
-		if (sop->opt == opt)
+		if (opt && sop->opts->name == opt)
 			break;
 		sop++;
 	}
@@ -1749,6 +1775,45 @@ parse_subopts(
 	}
 }
 
+static bool
+parse_cfgopt(
+	const char	*section,
+	const char	*name,
+	const char	*value,
+	struct cli_params *cli)
+{
+	struct subopts	*sop = &subopt_tab[0];
+	char		**subopts;
+	int		ret = 0;
+	int		i;
+
+	while (sop->opts) {
+		if (sop->opts->ini_section[0] != '\0' &&
+		    strcasecmp(section, sop->opts->ini_section) == 0)
+			break;
+		sop++;
+	}
+
+	/* Config files with unknown sections get caught here. */
+	if (!sop->opts)
+		goto invalid_opt;
+
+	subopts = (char **)sop->opts->subopts;
+	for (i = 0; i < MAX_SUBOPTS; i++) {
+		if (!subopts[i])
+			break;
+		if (strcasecmp(name, subopts[i]) == 0) {
+			ret = (sop->parser)(sop->opts, i, value, cli);
+			if (ret)
+				goto invalid_opt;
+			return true;
+		}
+	}
+invalid_opt:
+	invalid_cfgfile_opt(cli->cfgfile, section, name, value);
+	return false;
+}
+
 static void
 validate_sectorsize(
 	struct mkfs_params	*cfg,
@@ -3630,9 +3695,8 @@ cfgfile_parse_ini(
 {
 	struct cli_params	*cli = user;
 
-	fprintf(stderr, "Ini debug: file %s, section %s, name %s, value %s\n",
-		cli->cfgfile, section, name, value);
-
+	if (!parse_cfgopt(section, name, value, cli))
+		return 0;
 	return 1;
 }
 
-- 
2.28.0