btrfs-progs: list-chunks: rename variables, adjust LNumber starting point

Rename variables tracking ordering, print the logical number starting
from 1 for consistency.

Sample output, sorted by usage:

Number      Type/profile    PStart    Length     PEnd LNumber   LStart Usage%
------ ----------------- --------- --------- -------- ------- -------- ------
     1     System/single   1.00MiB   4.00MiB  5.00MiB       1  1.00MiB   1.56
     2   Metadata/single   5.00MiB   8.00MiB 13.00MiB       2  5.00MiB   2.34
     3       Data/single  12.27GiB   1.00GiB 13.27GiB      17 77.02GiB   2.62
     4       Data/single  11.27GiB   1.00GiB 12.27GiB      15 75.77GiB   3.72
     5       Data/single  13.27GiB   1.00GiB 14.27GiB      18 78.02GiB   3.76
     6   Metadata/single   2.27GiB 256.00MiB  2.52GiB       6 68.02GiB   3.98
     7       Data/single  10.27GiB   1.00GiB 11.27GiB      14 74.77GiB   4.01
     8       Data/single   9.27GiB   1.00GiB 10.27GiB      13 73.77GiB   4.14
     9   Metadata/single   5.77GiB 256.00MiB  6.02GiB      12 73.52GiB   7.89
    10   Metadata/single   6.02GiB 256.00MiB  6.27GiB      16 76.77GiB   9.23
    11       Data/single  16.27GiB   1.00GiB 17.27GiB      19 81.02GiB  18.25
    12       Data/single   8.27GiB   1.00GiB  9.27GiB      11 72.52GiB  39.90
    13       Data/single   3.52GiB   1.00GiB  4.52GiB       8 69.27GiB  44.52
    14       Data/single   6.27GiB   1.00GiB  7.27GiB       3 65.02GiB  57.73
    15       Data/single   4.52GiB   1.00GiB  5.52GiB       9 70.27GiB  59.63
    16       Data/single 277.00MiB   1.00GiB  1.27GiB       4 66.02GiB  60.43
    17       Data/single   2.52GiB   1.00GiB  3.52GiB       7 68.27GiB  61.37
    18       Data/single   1.27GiB   1.00GiB  2.27GiB       5 67.02GiB  62.35
    19       Data/single   7.27GiB   1.00GiB  8.27GiB      10 71.52GiB  64.99

Signed-off-by: David Sterba <dsterba@suse.com>

Author: kdave

cmds/inspect.c

@@ -731,9 +731,9 @@ struct list_chunks_entry {
 	u64 lstart;
 	u64 length;
 	u64 flags;
-	u64 age;
+	u64 lnumber;
 	u64 used;
-	u32 pnumber;
+	u32 number;
 };
 
 struct list_chunks_ctx {
@@ -843,7 +843,7 @@ static int print_list_chunks(struct list_chunks_ctx *ctx, unsigned sort_mode,
 	int i;
 	int chidx;
 	u64 lastend;
-	u64 age;
+	u64 number;
 	u32 gaps;
 	u32 tabidx;
 
@@ -853,17 +853,17 @@ static int print_list_chunks(struct list_chunks_ctx *ctx, unsigned sort_mode,
 	 */
 	qsort(ctx->stats, ctx->length, sizeof(ctx->stats[0]), cmp_cse_devid_start);
 	devid = 0;
-	age = 0;
+	number = 0;
 	gaps = 0;
 	lastend = 0;
 	for (i = 0; i < ctx->length; i++) {
 		e = ctx->stats[i];
 		if (e.devid != devid) {
 			devid = e.devid;
-			age = 0;
+			number = 0;
 		}
-		ctx->stats[i].pnumber = age;
-		age++;
+		ctx->stats[i].number = number;
+		number++;
 		if (with_empty && sort_mode == CHUNK_SORT_PSTART && e.start != lastend)
 			gaps++;
 		lastend = e.start + e.length;
@@ -937,7 +937,7 @@ static int print_list_chunks(struct list_chunks_ctx *ctx, unsigned sort_mode,
 		table_printf(table, 2, tabidx, ">%s", pretty_size_mode(e.start, unit_mode));
 		table_printf(table, 3, tabidx, ">%s", pretty_size_mode(e.length, unit_mode));
 		table_printf(table, 4, tabidx, ">%s", pretty_size_mode(e.start + e.length, unit_mode));
-		table_printf(table, 5, tabidx, ">%llu", e.age);
+		table_printf(table, 5, tabidx, ">%llu", e.lnumber + 1);
 		table_printf(table, 6, tabidx, ">%s", pretty_size_mode(e.lstart, unit_mode));
 		if (with_usage)
 			table_printf(table, 7, tabidx, ">%6.2f",
@@ -995,8 +995,8 @@ static int cmd_inspect_list_chunks(const struct cmd_struct *cmd,
 	struct btrfs_ioctl_search_key *sk = &args.key;
 	struct btrfs_ioctl_search_header sh;
 	unsigned long off = 0;
-	u64 *age = NULL;
-	unsigned age_size = 128;
+	u64 *lnumber = NULL;
+	unsigned lnumber_size = 128;
 	int ret;
 	int fd;
 	int i;
@@ -1091,8 +1091,8 @@ static int cmd_inspect_list_chunks(const struct cmd_struct *cmd,
 	sk->max_type = BTRFS_CHUNK_ITEM_KEY;
 	sk->max_offset = (u64)-1;
 	sk->max_transid = (u64)-1;
-	age = calloc(age_size, sizeof(u64));
-	if (!age) {
+	lnumber = calloc(lnumber_size, sizeof(u64));
+	if (!lnumber) {
 		ret = 1;
 		error_msg(ERROR_MSG_MEMORY, NULL);
 		goto out_nomem;
@@ -1133,22 +1133,22 @@ static int cmd_inspect_list_chunks(const struct cmd_struct *cmd,
 				e->lstart = sh.offset;
 				e->length = item->length;
 				e->flags = item->type;
-				e->pnumber = -1;
-				while (devid > age_size) {
+				e->number = -1;
+				while (devid > lnumber_size) {
 					u64 *tmp;
-					unsigned old_size = age_size;
+					unsigned old_size = lnumber_size;
 
-					age_size += 128;
-					tmp = calloc(age_size, sizeof(u64));
+					lnumber_size += 128;
+					tmp = calloc(lnumber_size, sizeof(u64));
 					if (!tmp) {
 						ret = 1;
 						error_msg(ERROR_MSG_MEMORY, NULL);
 						goto out_nomem;
 					}
-					memcpy(tmp, age, sizeof(u64) * old_size);
-					age = tmp;
+					memcpy(tmp, lnumber, sizeof(u64) * old_size);
+					lnumber = tmp;
 				}
-				e->age = age[devid]++;
+				e->lnumber = lnumber[devid]++;
 				if (with_usage) {
 					if (used == (u64)-1)
 						used = fill_usage(fd, sh.offset);
@@ -1186,7 +1186,7 @@ static int cmd_inspect_list_chunks(const struct cmd_struct *cmd,
 
 out_nomem:
 	free(ctx.stats);
-	free(age);
+	free(lnumber);
 
 	return !!ret;
 }