The GlobalReserve space in 'btrfs fi df' is always confusing for a lot
of users.
As it is not a special chunk type like DATA or METADATA, it's in fact a
sub-type of METADATA.
So change the output to skip GlobalReserve by default, and adding its
total to metadata used.
And add a new option '-r|--reserve' to show the GlobalReserve, but skip
the profile of GlobalReserve.
Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com>
---
Documentation/btrfs-filesystem.asciidoc | 8 ++++++
cmds-filesystem.c | 51 ++++++++++++++++++++++++++++++---
2 files changed, 55 insertions(+), 4 deletions(-)
diff --git a/Documentation/btrfs-filesystem.asciidoc
b/Documentation/btrfs-filesystem.asciidoc
index 31cd51b..510c23f 100644
--- a/Documentation/btrfs-filesystem.asciidoc
+++ b/Documentation/btrfs-filesystem.asciidoc
@@ -22,6 +22,14 @@ Show space usage information for a mount point.
+
`Options`
+
+-r|--reserve::::
+also show Global Reserve space info.
++
+Global Reserve space is reserved space from metadata. It's reserved for Btrfs
+metadata COW.
++
+It will be counted as 'used' space in metadata space info.
++
-b|--raw::::
raw numbers in bytes, without the 'B' suffix
-h|--human-readable::::
diff --git a/cmds-filesystem.c b/cmds-filesystem.c
index 25317fa..26e62e0 100644
--- a/cmds-filesystem.c
+++ b/cmds-filesystem.c
@@ -123,6 +123,8 @@ static const char * const filesystem_cmd_group_usage[] = {
static const char * const cmd_filesystem_df_usage[] = {
"btrfs filesystem df [options] <path>",
"Show space usage information for a mount point",
+ "",
+ "-r|--reserve show global reserve space info"
HELPINFO_UNITS_SHORT_LONG,
NULL
};
@@ -175,12 +177,32 @@ static int get_df(int fd, struct btrfs_ioctl_space_args
**sargs_ret)
return 0;
}
-static void print_df(struct btrfs_ioctl_space_args *sargs, unsigned unit_mode)
+static void print_df(struct btrfs_ioctl_space_args *sargs, unsigned unit_mode,
+ int show_reserve)
{
u64 i;
+ u64 global_reserve = 0;
struct btrfs_ioctl_space_info *sp = sargs->spaces;
+ /* First iterate to get global reserve space size */
for (i = 0; i < sargs->total_spaces; i++, sp++) {
+ if (sp->flags & BTRFS_SPACE_INFO_GLOBAL_RSV)
+ global_reserve = sp->total_bytes;
+ }
+
+ for (i = 0, sp = sargs->spaces; i < sargs->total_spaces; i++, sp++) {
+ if (sp->flags & BTRFS_SPACE_INFO_GLOBAL_RSV) {
+ if (!show_reserve)
+ continue;
+ printf(" \\- %s: reserved=%s, used=%s\n",
+ btrfs_group_type_str(sp->flags),
+ pretty_size_mode(sp->total_bytes, unit_mode),
+ pretty_size_mode(sp->used_bytes, unit_mode));
+ continue;
+ }
+
+ if (sp->flags & BTRFS_BLOCK_GROUP_METADATA)
+ sp->used_bytes += global_reserve;
printf("%s, %s: total=%s, used=%s\n",
btrfs_group_type_str(sp->flags),
btrfs_group_profile_str(sp->flags),
@@ -196,14 +218,35 @@ static int cmd_filesystem_df(int argc, char **argv)
int fd;
char *path;
DIR *dirstream = NULL;
+ int show_reserve = 0;
unsigned unit_mode;
unit_mode = get_unit_mode_from_arg(&argc, argv, 1);
- if (argc != 2 || argv[1][0] == '-')
+ while (1) {
+ int c;
+ static const struct option long_options[] = {
+ { "reserve", no_argument, NULL, 'r'},
+ { NULL, 0, NULL, 0}
+ };
+
+ c = getopt_long(argc, argv, "r", long_options, NULL);
+ if (c < 0)
+ break;
+ switch (c) {
+ case 'r':
+ show_reserve = 1;
+ break;
+ default:
+ usage(cmd_filesystem_df_usage);
+ }
+ }
+
+ argc = argc - optind;
+ if (check_argc_exact(argc, 1))
usage(cmd_filesystem_df_usage);
- path = argv[1];
+ path = argv[optind];
fd = btrfs_open_dir(path, &dirstream, 1);
if (fd < 0)
@@ -212,7 +255,7 @@ static int cmd_filesystem_df(int argc, char **argv)
ret = get_df(fd, &sargs);
if (ret == 0) {
- print_df(sargs, unit_mode);
+ print_df(sargs, unit_mode, show_reserve);
free(sargs);
} else {
fprintf(stderr, "ERROR: get_df failed %s\n", strerror(-ret));
--
2.6.3
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