I've kept hitting enospc warnings of global_rsv while running defragment on
files:
btrfs: block rsv returned -28
WARNING: at fs/btrfs/extent-tree.c:5984 btrfs_alloc_free_block+0x333/0x340
[btrfs]()
...
I used a fio jobs to create a file with lots of fragments:
$ filefrag /mnt/btrfs/foobar
/mnt/btrfs/foobar: 66964 extents found
and then "btrfs fi defrag /mnt/btrfs/foobar && sync" would pop the warnings.
I found that the global_rsv size is just not enough for defragment, and didn't
find any space leak in using global_rsv, so double it and go ahead.
Signed-off-by: Liu Bo <liubo2...@cn.fujitsu.com>
---
fs/btrfs/extent-tree.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 8603ee4..77ea23c 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3979,7 +3979,7 @@ static u64 calc_global_metadata_size(struct btrfs_fs_info
*fs_info)
num_bytes += div64_u64(data_used + meta_used, 50);
if (num_bytes * 3 > meta_used)
- num_bytes = div64_u64(meta_used, 3);
+ num_bytes = div64_u64(meta_used, 3) * 2;
return ALIGN(num_bytes, fs_info->extent_root->leafsize << 10);
}
--
1.6.5.2
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