Qu Wenruo
2014-Sep-24 03:16 UTC
[PATCH] btrfs-progs: Add human readable incompat flags output for btrfs-show-super
Add human readable incompat flags output for btrfs-show-super,
now no longer needs to calculate the hex flags by hand.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
---
btrfs-show-super.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 53 insertions(+)
diff --git a/btrfs-show-super.c b/btrfs-show-super.c
index 38c5d26..c591865 100644
--- a/btrfs-show-super.c
+++ b/btrfs-show-super.c
@@ -285,6 +285,58 @@ static void print_backup_roots(struct btrfs_super_block
*sb)
}
}
+struct readable_flag_entry {
+ u64 bit;
+ char *output;
+};
+
+#define DEF_INCOMPAT_FLAG_ENTRY(bit_name) \
+ {BTRFS_FEATURE_INCOMPAT_##bit_name, #bit_name}
+
+struct readable_flag_entry incompat_flags_array[] = {
+ DEF_INCOMPAT_FLAG_ENTRY(MIXED_BACKREF),
+ DEF_INCOMPAT_FLAG_ENTRY(DEFAULT_SUBVOL),
+ DEF_INCOMPAT_FLAG_ENTRY(MIXED_GROUPS),
+ DEF_INCOMPAT_FLAG_ENTRY(COMPRESS_LZO),
+ DEF_INCOMPAT_FLAG_ENTRY(COMPRESS_LZOv2),
+ DEF_INCOMPAT_FLAG_ENTRY(BIG_METADATA),
+ DEF_INCOMPAT_FLAG_ENTRY(EXTENDED_IREF),
+ DEF_INCOMPAT_FLAG_ENTRY(RAID56),
+ DEF_INCOMPAT_FLAG_ENTRY(SKINNY_METADATA),
+ DEF_INCOMPAT_FLAG_ENTRY(NO_HOLES)
+};
+static const int incompat_flags_num = sizeof(incompat_flags_array) /
+ sizeof(struct readable_flag_entry);
+
+static void print_readable_incompat_flag(u64 flag)
+{
+ int i;
+ int first = 1;
+ struct readable_flag_entry *entry;
+
+ if (!flag)
+ return;
+ printf("\t\t\t( ");
+ for (i = 0; i < incompat_flags_num; i++) {
+ entry = incompat_flags_array + i;
+ if (flag & entry->bit) {
+ if (first)
+ printf("%s ", entry->output);
+ else
+ printf("|\n\t\t\t %s ", entry->output);
+ }
+ first = 0;
+ }
+ flag &= ~BTRFS_FEATURE_INCOMPAT_SUPP;
+ if (flag) {
+ if (first)
+ printf("unknown flag:%llx ", flag);
+ else
+ printf("|\n\t\t\t unknown flag:%llx ", flag);
+ }
+ printf(")\n");
+}
+
static void dump_superblock(struct btrfs_super_block *sb, int full)
{
int i;
@@ -364,6 +416,7 @@ static void dump_superblock(struct btrfs_super_block *sb,
int full)
(unsigned long long)btrfs_super_compat_ro_flags(sb));
printf("incompat_flags\t\t0x%llx\n",
(unsigned long long)btrfs_super_incompat_flags(sb));
+ print_readable_incompat_flag(btrfs_super_incompat_flags(sb));
printf("csum_type\t\t%llu\n",
(unsigned long long)btrfs_super_csum_type(sb));
printf("csum_size\t\t%llu\n",
--
2.1.0
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