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btrfs: kill min_allocable_bytes in inc_block_group_ro

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This is a relic from a time before we had a proper reservation mechanism
and you could end up with really full chunks at chunk allocation time.
This doesn't make sense anymore, so just kill it.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2019-11-26 11:25:54 -05:00 committed by David Sterba
parent 9f246926b4
commit f893556637
1 changed files with 4 additions and 18 deletions
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22
fs/btrfs/block-group.c
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@ -1185,21 +1185,8 @@ static int inc_block_group_ro(struct btrfs_block_group *cache, int force)
struct btrfs_space_info *sinfo = cache->space_info;
u64 num_bytes;
u64 sinfo_used;
u64 min_allocable_bytes;
int ret = -ENOSPC;
/*
* We need some metadata space and system metadata space for
* allocating chunks in some corner cases until we force to set
* it to be readonly.
*/
if ((sinfo->flags &
(BTRFS_BLOCK_GROUP_SYSTEM | BTRFS_BLOCK_GROUP_METADATA)) &&
!force)
min_allocable_bytes = SZ_1M;
else
min_allocable_bytes = 0;
spin_lock(&sinfo->lock);
spin_lock(&cache->lock);
@ -1217,10 +1204,9 @@ static int inc_block_group_ro(struct btrfs_block_group *cache, int force)
* sinfo_used + num_bytes should always <= sinfo->total_bytes.
*
* Here we make sure if we mark this bg RO, we still have enough
* free space as buffer (if min_allocable_bytes is not 0).
* free space as buffer.
*/
if (sinfo_used + num_bytes + min_allocable_bytes <=
sinfo->total_bytes) {
if (sinfo_used + num_bytes <= sinfo->total_bytes) {
sinfo->bytes_readonly += num_bytes;
cache->ro++;
list_add_tail(&cache->ro_list, &sinfo->ro_bgs);
@ -1233,8 +1219,8 @@ out:
btrfs_info(cache->fs_info,
"unable to make block group %llu ro", cache->start);
btrfs_info(cache->fs_info,
"sinfo_used=%llu bg_num_bytes=%llu min_allocable=%llu",
sinfo_used, num_bytes, min_allocable_bytes);
"sinfo_used=%llu bg_num_bytes=%llu",
sinfo_used, num_bytes);
btrfs_dump_space_info(cache->fs_info, cache->space_info, 0, 0);
}
return ret;