[PATCH 07/18] btrfs: add a NOSPACECACHE mount option flag

[Josef Bacik <josef@toxicpanda.com>]

With the old mount API we'd pre-populate the mount options with the
space cache settings of the file system, and then the user toggled them
on or off with the mount options.  When we switch to the new mount API
the mount options will be set before we get into opening the file
system, so we need a flag to indicate that the user explicitly asked for
-o nospace_cache so we can make the appropriate changes after the fact.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
 fs/btrfs/disk-io.c | 1 +
 fs/btrfs/fs.h      | 1 +
 2 files changed, 2 insertions(+)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 072c45811c41..c70e507a28d0 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2938,6 +2938,7 @@ void btrfs_clear_oneshot_options(struct btrfs_fs_info *fs_info)
 {
 	btrfs_clear_opt(fs_info->mount_opt, USEBACKUPROOT);
 	btrfs_clear_opt(fs_info->mount_opt, CLEAR_CACHE);
+	btrfs_clear_opt(fs_info->mount_opt, NOSPACECACHE);
 }
 
 /*
diff --git a/fs/btrfs/fs.h b/fs/btrfs/fs.h
index 318df6f9d9cb..ecfa13a9c2cf 100644
--- a/fs/btrfs/fs.h
+++ b/fs/btrfs/fs.h
@@ -188,6 +188,7 @@ enum {
 	BTRFS_MOUNT_IGNOREBADROOTS		= (1UL << 27),
 	BTRFS_MOUNT_IGNOREDATACSUMS		= (1UL << 28),
 	BTRFS_MOUNT_NODISCARD			= (1UL << 29),
+	BTRFS_MOUNT_NOSPACECACHE		= (1UL << 30),
 };
 
 /*
-- 
2.41.0