This patch adds infrastructure that will be used in subsequent patches.

The Value field is the actual value used in computations for creating
the filesystem.  This is initialized with sensible default values. If
initialized to 0, the value is considered disabled. User input will
override default values.  If the field is a string and not a number, the
value is set to a positive non-zero number when user input has been
supplied.

Add functions that can be used to get/set values to opts table.

Signed-off-by: Jan Tulak <redacted>

---
Change:
* make the value type to be long long instead of uint64 for now
* add collateral updates
* add bounds to get/set functions
* update the description of commit/in code
* merge with another patch, which adds the get/set functions.
---
 mkfs/xfs_mkfs.c | 194 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 194 insertions(+)

diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c
index 3e7ba5f0..61ef09e8 100644
--- a/mkfs/xfs_mkfs.c
+++ b/mkfs/xfs_mkfs.c

@@ -117,6 +117,13 @@ unsigned int		sectorsize;
  *     Filled raw string from the user, so we never lose that information e.g.
  *     to print it back in case of an issue.
  *
+ *   value OPTIONAL
+ *     The actual value used in computations for creating the filesystem.
+ *     This is initialized with sensible default values. If initialized to 0,
+ *     the value is considered disabled. User input will override default
+ *     values. If the field is a string and not a number, the value is set to
+ *     a positive non-zero number when user input has been supplied.
+ *
  */
 struct opt_params {
 	int		index;

@@ -134,6 +141,7 @@ struct opt_params {
 		long long	maxval;
 		long long	flagval;
 		char		*raw_input;
+		long long	value;

 	}		subopt_params[MAX_SUBOPTS];
 } opts[MAX_OPTS] = {
 #define OPT_B	0

@@ -750,6 +758,180 @@ struct opt_params {
 #define WHACK_SIZE (128 * 1024)
 
 /*
+ * Get and set values to the opts table.
+ */
+static int
+get_conf_val_unsafe(int opt, int subopt, uint64_t *output)
+{
+	if (subopt < 0 || subopt >= MAX_SUBOPTS ||
+	    opt < 0 || opt >= MAX_OPTS) {
+		fprintf(stderr,
+		"This is a bug: get_conf_val called with invalid opt/subopt: %d/%d\n",

+			break;
+		}
+		break;
+	case OPT_M:
+		switch (subopt) {
+		}
+		break;
+	case OPT_N:
+		switch (subopt) {
+		case N_LOG:
+			set_conf_val(OPT_N, N_SIZE, 1 << val);
+			break;
+		case N_SIZE:
+			set_conf_val(OPT_N, N_LOG,
+				libxfs_highbit32(val));
+			break;
+		}
+		break;
+	case OPT_R:
+		switch (subopt) {
+		}
+		break;
+	case OPT_S:
+		switch (subopt) {
+		case S_LOG:
+		case S_SECTLOG:
+			set_conf_val(OPT_S, S_LOG, val);
+			set_conf_val(OPT_D, D_SECTLOG, val);
+			set_conf_val(OPT_L, L_SECTLOG, val);
+			set_conf_val(OPT_D, D_SECTSIZE,
+					1 << val);
+			set_conf_val(OPT_S, S_SIZE, 1 << val);
+			set_conf_val(OPT_S, S_SECTSIZE,
+					1 << val);
+			set_conf_val(OPT_L, L_SECTLOG, val);
+			set_conf_val(OPT_L,
+					L_SECTSIZE, 1 << val);
+
+			set_conf_val(OPT_L, L_SECTSIZE, val);
+			break;
+		case S_SIZE:
+		case S_SECTSIZE:
+			set_conf_val(OPT_S, S_SIZE, val);
+			set_conf_val(OPT_D, D_SECTSIZE, val);
+			set_conf_val(OPT_D, D_SECTLOG,
+				libxfs_highbit32(val));
+			set_conf_val(OPT_S, S_LOG,
+				libxfs_highbit32(val));
+			set_conf_val(OPT_S, S_SECTLOG,
+				libxfs_highbit32(val));
+			set_conf_val(OPT_L,
+					L_SECTSIZE, val);
+			set_conf_val(OPT_L, L_SECTLOG,
+					libxfs_highbit32(val));
+			break;
+		}
+		break;
+	}
+}
+
+/*
  * Return 0 on success, -ENOMEM if it could not allocate enough memory for
  * the string to be saved.
  */

@@ -932,6 +1114,18 @@ getnum(
 }
 
 /*
+ * A wrapper for getnum and set_conf_val.
+ */
+static inline long long
+parse_conf_val(int opt, int subopt, char *value)
+{
+	long long num = getnum(value, &opts[opt], subopt);
+
+	set_conf_val_collateral(opt, subopt, num);
+	return num;
+}
+
+/*
  * Convert lsu to lsunit for 512 bytes blocks and check validity of the values.
  */
 static void

-- 
2.13.3

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