btrfs: reada: limit max works count

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Reada creates 2 works for each level of tree recursively.

In case of a tree having many levels, the number of created works
is 2^level_of_tree.
Actually we don't need so many works in parallel, this patch limits
max works to BTRFS_MAX_MIRRORS * 2.

The per-fs works_counter will be also used for btrfs_reada_wait() to
check is there are background workers.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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This commit is contained in:

Zhao Lei 2016-01-07 18:38:48 +08:00 • committed by David Sterba

parent 895a11b868

commit 2fefd5583f

3 changed files with 12 additions and 1 deletions

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3

fs/btrfs/ctree.h

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1

fs/btrfs/disk-io.c

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9

fs/btrfs/reada.c

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