diff mbox series

[v4,5/8] btrfs: use sb state to print space_cache mount option

Message ID 07f096a4826b78137d86f07878142655a5d059d8.1603318242.git.boris@bur.io
State New, archived
Headers show
Series btrfs: free space tree mounting fixes | expand

Commit Message

Boris Burkov Oct. 21, 2020, 11:06 p.m. UTC
To make the contents of /proc/mounts better match the actual state of
the file system, base the display of the space cache mount options off
the contents of the super block rather than the last mount options
passed in. Since there are many scenarios where the mount will ignore a
space cache option, simply showing the passed in option is misleading.

For example, if we mount with -o remount,space_cache=v2 on a read-write
file system without an existing free space tree, we won't build a free
space tree, but /proc/mounts will read space_cache=v2 (until we mount
again and it goes away)

cache_generation is set iff space_cache=v1, FREE_SPACE_TREE is set iff
space_cache=v2, and if neither is the case, we print nospace_cache.

Signed-off-by: Boris Burkov <boris@bur.io>
---
 fs/btrfs/super.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index fd3dbf419072..c78e3379fa93 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1427,9 +1427,9 @@  static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
 		seq_puts(seq, ",discard=async");
 	if (!(info->sb->s_flags & SB_POSIXACL))
 		seq_puts(seq, ",noacl");
-	if (btrfs_test_opt(info, SPACE_CACHE))
+	if (btrfs_free_space_cache_v1_active(info))
 		seq_puts(seq, ",space_cache");
-	else if (btrfs_test_opt(info, FREE_SPACE_TREE))
+	else if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE))
 		seq_puts(seq, ",space_cache=v2");
 	else
 		seq_puts(seq, ",nospace_cache");