From: Josef Bacik <josef@toxicpanda.com>
To: linux-btrfs@vger.kernel.org, kernel-team@fb.com, wqu@suse.com
Subject: [PATCH 2/4] btrfs: kill min_allocable_bytes in inc_block_group_ro
Date: Tue, 26 Nov 2019 11:25:54 -0500 [thread overview]
Message-ID: <20191126162556.150483-3-josef@toxicpanda.com> (raw)
In-Reply-To: <20191126162556.150483-1-josef@toxicpanda.com>
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.
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
fs/btrfs/block-group.c | 22 ++++------------------
1 file changed, 4 insertions(+), 18 deletions(-)
diff --git a/fs/btrfs/block-group.c b/fs/btrfs/block-group.c
index 6934a5b8708f..66fa39632cde 100644
--- a/fs/btrfs/block-group.c
+++ b/fs/btrfs/block-group.c
@@ -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 @@ static int inc_block_group_ro(struct btrfs_block_group *cache, int force)
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;
--
2.23.0
next prev parent reply other threads:[~2019-11-26 16:26 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-26 16:25 [PATCH 0/4][v2] clean up how we mark block groups read only Josef Bacik
2019-11-26 16:25 ` [PATCH 1/4] btrfs: don't pass system_chunk into can_overcommit Josef Bacik
2019-11-26 16:25 ` Josef Bacik [this message]
2019-11-27 10:45 ` [PATCH 2/4] btrfs: kill min_allocable_bytes in inc_block_group_ro Qu Wenruo
2019-11-26 16:25 ` [PATCH 3/4] btrfs: fix force usage " Josef Bacik
2019-11-27 10:45 ` Qu Wenruo
2019-12-03 19:50 ` David Sterba
2019-11-26 16:25 ` [PATCH 4/4] btrfs: use btrfs_can_overcommit " Josef Bacik
2019-11-27 10:48 ` Qu Wenruo
2019-12-03 19:51 ` [PATCH 0/4][v2] clean up how we mark block groups read only David Sterba
2020-01-10 4:35 ` Qu Wenruo
2020-01-10 16:05 ` Josef Bacik
-- strict thread matches above, loose matches on Subject: below --
2019-11-25 14:40 [PATCH 0/4][RFC] " Josef Bacik
2019-11-25 14:40 ` [PATCH 2/4] btrfs: kill min_allocable_bytes in inc_block_group_ro Josef Bacik
2019-11-26 2:35 ` Qu Wenruo
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