The patch titled
Subject: btrfs: readpages() should submit IO as read-ahead
has been added to the -mm tree. Its filename is
btrfs-readpages-should-submit-io-as-read-ahead.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/btrfs-readpages-should-submit-io-as-read-ahead.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/btrfs-readpages-should-submit-io-as-read-ahead.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
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------------------------------------------------------
From: Jens Axboe <axboe@xxxxxxxxx>
Subject: btrfs: readpages() should submit IO as read-ahead
a_ops->readpages() is only ever used for read-ahead. Ensure that we pass
this information down to the block layer.
Link: http://lkml.kernel.org/r/20180621010725.17813-4-axboe@xxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Chris Mason <clm@xxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
diff -puN fs/btrfs/extent_io.c~btrfs-readpages-should-submit-io-as-read-ahead fs/btrfs/extent_io.c
--- a/fs/btrfs/extent_io.c~btrfs-readpages-should-submit-io-as-read-ahead
+++ a/fs/btrfs/extent_io.c
@@ -3116,7 +3116,7 @@ static inline void __do_contiguous_readp
for (index = 0; index < nr_pages; index++) {
__do_readpage(tree, pages[index], btrfs_get_extent, em_cached,
- bio, 0, bio_flags, 0, prev_em_start);
+ bio, 0, bio_flags, REQ_RAHEAD, prev_em_start);
put_page(pages[index]);
}
}
_
Patches currently in -mm which might be from axboe@xxxxxxxxx are
mpage-add-argument-structure-for-do_mpage_readpage.patch
mpage-mpage_readpages-should-submit-io-as-read-ahead.patch
btrfs-readpages-should-submit-io-as-read-ahead.patch
ext4-readpages-should-submit-io-as-read-ahead.patch
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