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btrfs-progs: read global reserve size from space infos 

Kernels >= 3.15 export the global block reserve as a space info presented
by 'btrfs fi df' but would display 'unknown' instead of some meaningful
string.

Signed-off-by: David Sterba <dsterba@suse.cz>
master
David Sterba 2014-04-29 17:57:01 +02:00
parent 5f1313a45d
commit da5db5596c
2 changed files with 12 additions and 1 deletions
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7
cmds-filesystem.c
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@ -120,7 +120,10 @@ static const char * const cmd_df_usage[] = {
static char *group_type_str(u64 flag)
{
switch (flag & BTRFS_BLOCK_GROUP_TYPE_MASK) {
u64 mask = BTRFS_BLOCK_GROUP_TYPE_MASK |
BTRFS_SPACE_INFO_GLOBAL_RSV;
switch (flag & mask) {
case BTRFS_BLOCK_GROUP_DATA:
return "Data";
case BTRFS_BLOCK_GROUP_SYSTEM:
@ -129,6 +132,8 @@ static char *group_type_str(u64 flag)
return "Metadata";
case BTRFS_BLOCK_GROUP_DATA|BTRFS_BLOCK_GROUP_METADATA:
return "Data+Metadata";
case BTRFS_SPACE_INFO_GLOBAL_RSV:
return "GlobalReserve";
default:
return "unknown";
}

6
ctree.h
View File

@ -860,6 +860,12 @@ struct btrfs_csum_item {
/* used in struct btrfs_balance_args fields */
#define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48)
/*
* GLOBAL_RSV does not exist as a on-disk block group type and is used
* internally for exporting info about global block reserve from space infos
*/
#define BTRFS_SPACE_INFO_GLOBAL_RSV (1ULL << 49)
#define BTRFS_QGROUP_STATUS_OFF 0
#define BTRFS_QGROUP_STATUS_ON 1
#define BTRFS_QGROUP_STATUS_SCANNING 2