Steps to reproduce:
# mkfs.btrfs -f /dev/sdb
# mount /dev/sdb /mnt -o compress-force=lzo
# mount /dev/sdb /mnt -o remount,compress=zlib
# cat /proc/mounts
Remounting from compress-force to compress could not clear compress-force
option. The problem is there is no way for users to clear compress-force
option separately.
Fix this problem by clearing @FORCE_COMPRESS flag when remounting to
compress=xxx.
Suggested-by: Tsutomu Itoh <t-itoh@xxxxxxxxxxxxxx>
Signed-off-by: Wang Shilong <wangsl.fnst@xxxxxxxxxxxxxx>
---
v1->v2: remove unnecessary message output which was addressed
by David.
---
fs/btrfs/super.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 4662d92..5aae8f0 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -513,6 +513,13 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
btrfs_info(root->fs_info,
"btrfs: use %s compression",
compress_type);
+ /*
+ * If we remount from compress-force=xxx to
+ * compress=xxx, we need clear FORCE_COMPRESS
+ * flag, otherwise, there is no way for users
+ * to disable forcible compression separately.
+ */
+ btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);
}
break;
case Opt_ssd:
--
1.8.3.1
--
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