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(parent: b47eda8) | patch
Btrfs: tune btrfs unplug functions for a small number of devices
authorChris Mason <chris.mason@oracle.com>
Mon, 10 Nov 2008 18:08:31 +0000 (13:08 -0500)
committerChris Mason <chris.mason@oracle.com>
Mon, 10 Nov 2008 18:08:31 +0000 (13:08 -0500)
commit240d5d482b69415b92ffce4b8dfca10799c9890b
tree16320929e2220a7859d187bf4eda3810d2886bf2tree | snapshot
parentb47eda8690a10f4fc01eb7b795078fa3fa57149fcommit | diff
Btrfs: tune btrfs unplug functions for a small number of devices

When btrfs unplugs, it tries to find the correct device to unplug
via search through the extent_map tree.  This avoids unplugging
a device that doesn't need it, but is a waste of time for filesystems
with a small number of devices.

This patch checks the total number of devices before doing the
search.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
fs/btrfs/disk-io.c diff | blob | history
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