From 8c6a3ee6dbd564d05019d396ecb5dc5b35cbc273 Mon Sep 17 00:00:00 2001 From: Miao Xie Date: Tue, 29 Jan 2013 10:05:05 +0000 Subject: [PATCH] Btrfs: add a comment for fs_info->max_inline Though ->max_inline is a 64bit variant, and may be accessed by multi-task, but it is just suggestive number, so we needn't add anything to protect fs_info->max_inline, just add a comment to explain wny we don't use a lock to protect it. Signed-off-by: Miao Xie Signed-off-by: Josef Bacik --- fs/btrfs/ctree.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 69321013683c..169baa817d96 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -1297,6 +1297,12 @@ struct btrfs_fs_info { u64 last_trans_log_full_commit; unsigned long mount_opt; unsigned long compress_type:4; + /* + * It is a suggestive number, the read side is safe even it gets a + * wrong number because we will write out the data into a regular + * extent. The write side(mount/remount) is under ->s_umount lock, + * so it is also safe. + */ u64 max_inline; u64 alloc_start; struct btrfs_transaction *running_transaction; -- 2.34.1