btrfs: hooks for readahead

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This adds the hooks needed for readahead. In the readpage_end_io_hook,
the extent state is checked for the EXTENT_READAHEAD flag. Only in this
case the readahead hook is called, to keep the impact on non-ra as low
as possible.
Additionally, a hook for a failed IO is added, otherwise readahead would
wait indefinitely for the extent to finish.

Changes for v2:
 - eliminate race condition

Signed-off-by: Arne Jansen <sensille@gmx.net>

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This commit is contained in:

Arne Jansen 2011-06-10 13:55:54 +02:00

parent 7414a03fbf

commit 4bb31e928d

2 changed files with 38 additions and 1 deletions

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37

fs/btrfs/disk-io.c

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2

fs/btrfs/extent_io.c

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