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[14/23] ceph: set up readahead size when rsize is not passed

Message ID 1311379382-9218-15-git-send-email-sage@newdream.net (mailing list archive)
State New, archived
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Commit Message

Sage Weil July 23, 2011, 12:02 a.m. UTC 
From: Yehuda Sadeh <yehuda@hq.newdream.net>

This should improve the default read performance, as without it
readahead is practically disabled.

Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
---
 fs/ceph/super.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
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Patch

diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index d4757c9..d47c5ec 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -779,6 +779,10 @@  static int ceph_register_bdi(struct super_block *sb,
 		fsc->backing_dev_info.ra_pages =
 			(fsc->mount_options->rsize + PAGE_CACHE_SIZE - 1)
 			>> PAGE_SHIFT;
+	else
+		fsc->backing_dev_info.ra_pages =
+			default_backing_dev_info.ra_pages;
+
 	err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%d",
 			   atomic_long_inc_return(&bdi_seq));
 	if (!err)