ext4: reimplement uninit extent optimization for move_extent_per_page()

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Uninitialized extent may became initialized(parallel writeback task)
at any moment after we drop i_data_sem, so we have to recheck extent's
state after we hold page's lock and i_data_sem.

If we about to change page's mapping we must hold page's lock in order to
serialize other users.

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

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Dmitry Monakhov 2012-09-26 12:54:52 -04:00 • committed by Theodore Ts'o

parent bb55748805

commit 8c85447391

1 changed files with 76 additions and 5 deletions

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fs/ext4/move_extent.c

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