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btrfs: readpages() should submit IO as read-ahead

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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@kernel.dk
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Chris Mason <clm@fb.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jens Axboe 2018-08-17 15:45:39 -07:00 committed by Linus Torvalds
parent 74c8164e1c
commit 5e9d398240
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/extent_io.c
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@ -3102,7 +3102,7 @@ static inline void __do_contiguous_readpages(struct extent_io_tree *tree,
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]);
}
}