btrfs: add and use readahead_batch_length

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Implement readahead_batch_length() to determine the number of bytes in
the current batch of readahead pages and use it in btrfs. Also use the
readahead_pos to get the offset.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Matthew Wilcox (Oracle) 2021-03-21 21:03:11 +00:00 • committed by David Sterba

parent 183ebab766

commit 32c0a6bcaa

2 changed files with 11 additions and 4 deletions

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6

fs/btrfs/extent_io.c

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9

include/linux/pagemap.h

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