From 063849eafda03edf6872a3728b4a98dcc86290c7 Mon Sep 17 00:00:00 2001 From: Arnd Hannemann Date: Mon, 16 Apr 2012 15:27:51 +0200 Subject: [PATCH] Btrfs: allow mount -o remount,compress=no Btrfs allows to turn on compression on a mounted and used filesystem by issuing mount -o remount,compress=lzo. This patch allows to turn compression off again while the filesystem is mounted. As suggested by David Sterba if the compress-force option was set, it is implicitly cleared if compression is turned off. Tested-by: David Sterba Signed-off-by: Arnd Hannemann --- fs/btrfs/super.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index ddc2efdda1a..88a2d2bb2d7 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -396,15 +396,22 @@ int btrfs_parse_options(struct btrfs_root *root, char *options) strcmp(args[0].from, "zlib") == 0) { compress_type = "zlib"; info->compress_type = BTRFS_COMPRESS_ZLIB; + btrfs_set_opt(info->mount_opt, COMPRESS); } else if (strcmp(args[0].from, "lzo") == 0) { compress_type = "lzo"; info->compress_type = BTRFS_COMPRESS_LZO; + btrfs_set_opt(info->mount_opt, COMPRESS); + } else if (strncmp(args[0].from, "no", 2) == 0) { + compress_type = "no"; + info->compress_type = BTRFS_COMPRESS_NONE; + btrfs_clear_opt(info->mount_opt, COMPRESS); + btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); + compress_force = false; } else { ret = -EINVAL; goto out; } - btrfs_set_opt(info->mount_opt, COMPRESS); if (compress_force) { btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); pr_info("btrfs: force %s compression\n", -- 2.20.1