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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 <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Miao Xie 2013-01-29 10:05:05 +00:00 committed by Josef Bacik
parent 55e301fd57
commit 8c6a3ee6db
1 changed files with 6 additions and 0 deletions
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6
fs/btrfs/ctree.h
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@ -1297,6 +1297,12 @@ struct btrfs_fs_info {
u64 last_trans_log_full_commit; u64 last_trans_log_full_commit;
unsigned long mount_opt; unsigned long mount_opt;
unsigned long compress_type:4; 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 max_inline;
u64 alloc_start; u64 alloc_start;
struct btrfs_transaction *running_transaction; struct btrfs_transaction *running_transaction;