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Btrfs: avoid unnecessarily locking inode when clearing a range

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If the range being cleared was not marked for defrag and we are not
about to clear the range from the defrag status, we don't need to
lock and unlock the inode.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Chris Mason <clm@fb.com>
Reviewed-by: Wang Shilong <wangshilong1991@gmail.com>
Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2017-07-27 19:52:55 +01:00 committed by David Sterba
parent 938e1c77f8
commit 4a4b964f42
1 changed files with 4 additions and 3 deletions
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7
fs/btrfs/inode.c
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@ -1801,10 +1801,11 @@ static void btrfs_clear_bit_hook(void *private_data,
u64 len = state->end + 1 - state->start;
u32 num_extents = count_max_extents(len);
spin_lock(&inode->lock);
if ((state->state & EXTENT_DEFRAG) && (*bits & EXTENT_DEFRAG))
if ((state->state & EXTENT_DEFRAG) && (*bits & EXTENT_DEFRAG)) {
spin_lock(&inode->lock);
inode->defrag_bytes -= len;
spin_unlock(&inode->lock);
spin_unlock(&inode->lock);
}
/*
* set_bit and clear bit hooks normally require _irqsave/restore