fs-writeback: Add helper function to start writeback if idle

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ext4, at least, would like to start pushing on writeback if it starts
to get close to ENOSPC when reserving worst-case blocks for delalloc
writes.  Writing out delalloc data will convert those worst-case
predictions into usually smaller actual usage, freeing up space
before we hit ENOSPC based on this speculation.

Thanks to Jens for the suggestion for the helper function,
& the naming help.

I've made the helper return status on whether writeback was
started even though I don't plan to use it in the ext4 patch;
it seems like it would be potentially useful to test this
in some cases.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Acked-by: Jan Kara <jack@suse.cz>

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Eric Sandeen 2009-12-23 07:57:07 -05:00 • committed by Theodore Ts'o

parent d3533d72e7

commit 17bd55d037

2 changed files with 18 additions and 0 deletions

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include/linux/writeback.h

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