GFS2: Update master statfs buffer with sd_statfs_spin locked

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Before this patch, function update_statfs called gfs2_statfs_change_out
to update the master statfs buffer without the sd_statfs_spin held.
In theory, another process could call gfs2_statfs_sync, which takes
the sd_statfs_spin lock and re-reads m_sc from the buffer. So there's
a theoretical timing window in which one process could write the
master statfs buffer, then another comes along and re-reads it, wiping
out the changes.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>

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This commit is contained in:

Bob Peterson 2015-03-11 09:52:31 -05:00

parent b58bf407ca

commit 901c6c665b

1 changed files with 2 additions and 3 deletions

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fs/gfs2/super.c

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