This is a note to let you know that I've just added the patch titled
btrfs: properly report 0 avail for very full file systems
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
btrfs-properly-report-0-avail-for-very-full-file-systems.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 58bfe2ccec5f9f137b41dd38f335290dcc13cd5c Mon Sep 17 00:00:00 2001
From: Josef Bacik <josef@xxxxxxxxxxxxxx>
Date: Mon, 18 Sep 2023 10:34:51 -0400
Subject: btrfs: properly report 0 avail for very full file systems
From: Josef Bacik <josef@xxxxxxxxxxxxxx>
commit 58bfe2ccec5f9f137b41dd38f335290dcc13cd5c upstream.
A user reported some issues with smaller file systems that get very
full. While investigating this issue I noticed that df wasn't showing
100% full, despite having 0 chunk space and having < 1MiB of available
metadata space.
This turns out to be an overflow issue, we're doing:
total_available_metadata_space - SZ_4M < global_block_rsv_size
to determine if there's not enough space to make metadata allocations,
which overflows if total_available_metadata_space is < 4M. Fix this by
checking to see if our available space is greater than the 4M threshold.
This makes df properly report 100% usage on the file system.
CC: stable@xxxxxxxxxxxxxxx # 4.14+
Signed-off-by: Josef Bacik <josef@xxxxxxxxxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/super.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -2196,7 +2196,7 @@ static int btrfs_statfs(struct dentry *d
* calculated f_bavail.
*/
if (!mixed && block_rsv->space_info->full &&
- total_free_meta - thresh < block_rsv->size)
+ (total_free_meta < thresh || total_free_meta - thresh < block_rsv->size))
buf->f_bavail = 0;
buf->f_type = BTRFS_SUPER_MAGIC;
Patches currently in stable-queue which might be from josef@xxxxxxxxxxxxxx are
queue-4.19/btrfs-properly-report-0-avail-for-very-full-file-systems.patch
