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btrfs: Convert fs_info->free_chunk_space to atomic64_t

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The ->free_chunk_space variable is used to track the unallocated space
and access to it is protected by a spinlock, which is not used for
anything else.  Make the code a bit self-explanatory by switching the
variable to an atomic64_t type and kill the spinlock.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
[ not a performance critical code, use of atomic type is ok ]
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2017-05-11 09:17:46 +03:00 • committed by David Sterba
parent 401b41e5a8
commit a5ed45f822
4 changed files with 10 additions and 26 deletions
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4
fs/btrfs/extent-tree.c
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@ -4646,9 +4646,7 @@ static int can_overcommit(struct btrfs_root *root,
used += space_info->bytes_may_use;
spin_lock(&fs_info->free_chunk_lock);
avail = fs_info->free_chunk_space;
spin_unlock(&fs_info->free_chunk_lock);
avail = atomic64_read(&fs_info->free_chunk_space);
/*
* If we have dup, raid1 or raid10 then only half of the free