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Btrfs: always pin metadata in discard mode

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We have an optimization in btrfs to allow blocks to be
immediately freed if they were allocated in this transaction and never
written.  Otherwise they are pinned and freed when the transaction
commits.

This isn't optimal for discard mode because immediately freeing
them means immediately discarding them.  It is better to give the
block to the pinning code and letting the (slow) discard happen later.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2009-10-14 09:38:28 -04:00
parent 0634857488
commit 444528b3e6
1 changed files with 8 additions and 0 deletions
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8
fs/btrfs/extent-tree.c
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@ -3686,6 +3686,14 @@ static int pin_down_bytes(struct btrfs_trans_handle *trans,
if (is_data)
goto pinit;
/*
* discard is sloooow, and so triggering discards on
* individual btree blocks isn't a good plan. Just
* pin everything in discard mode.
*/
if (btrfs_test_opt(root, DISCARD))
goto pinit;
buf = btrfs_find_tree_block(root, bytenr, num_bytes);
if (!buf)
goto pinit;