From: Qu Wenruo <wqu@suse.com>
To: linux-btrfs@vger.kernel.org
Subject: [PATCH] btrfs: Output ENOSPC debug info in inc_block_group_ro()
Date: Wed, 30 Jan 2019 13:07:51 +0800 [thread overview]
Message-ID: <20190130050751.31766-1-wqu@suse.com> (raw)
Since inc_block_group_ro() would return -ENOSPC, outputting debug info
for enospc_debug mount option would be helpful to debug some balance
false ENOSPC report.
Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/extent-tree.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index b15afeae16df..6becfc3b2b72 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -9588,6 +9588,7 @@ static int inc_block_group_ro(struct btrfs_block_group_cache *cache, int force)
{
struct btrfs_space_info *sinfo = cache->space_info;
u64 num_bytes;
+ u64 sinfo_used;
u64 min_allocable_bytes;
int ret = -ENOSPC;
@@ -9614,9 +9615,10 @@ static int inc_block_group_ro(struct btrfs_block_group_cache *cache, int force)
num_bytes = cache->key.offset - cache->reserved - cache->pinned -
cache->bytes_super - btrfs_block_group_used(&cache->item);
+ sinfo_used = btrfs_space_info_used(sinfo, true);
- if (btrfs_space_info_used(sinfo, true) + num_bytes +
- min_allocable_bytes <= sinfo->total_bytes) {
+ if (sinfo_used + num_bytes + min_allocable_bytes <=
+ sinfo->total_bytes) {
sinfo->bytes_readonly += num_bytes;
cache->ro++;
list_add_tail(&cache->ro_list, &sinfo->ro_bgs);
@@ -9625,6 +9627,15 @@ static int inc_block_group_ro(struct btrfs_block_group_cache *cache, int force)
out:
spin_unlock(&cache->lock);
spin_unlock(&sinfo->lock);
+ if (ret == -ENOSPC && btrfs_test_opt(cache->fs_info, ENOSPC_DEBUG)) {
+ btrfs_info(cache->fs_info,
+ "unable to make block group %llu ro",
+ cache->key.objectid);
+ btrfs_info(cache->fs_info,
+ "sinfo_used=%llu bg_num_bytes=%llu min_allocable=%llu",
+ sinfo_used, num_bytes, min_allocable_bytes);
+ dump_space_info(cache->fs_info, cache->space_info, 0, 0);
+ }
return ret;
}
--
2.20.1
next reply other threads:[~2019-01-30 5:07 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-30 5:07 Qu Wenruo [this message]
2019-01-30 17:13 ` [PATCH] btrfs: Output ENOSPC debug info in inc_block_group_ro() David Sterba
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