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btrfs: Output ENOSPC debug info in inc_block_group_ro

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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>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2019-01-30 13:07:51 +08:00 committed by David Sterba
parent c8f72b98b6
commit 3ece54e504
1 changed files with 13 additions and 2 deletions
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15
fs/btrfs/extent-tree.c
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@ -9605,6 +9605,7 @@ 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;
@ -9631,9 +9632,10 @@ 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);
@ -9642,6 +9644,15 @@ 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;
}