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H A D | super.c | 901c6c66 Wed Mar 11 09:52:31 CDT 2015 Bob Peterson <rpeterso@redhat.com> GFS2: Update master statfs buffer with sd_statfs_spin locked
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> 901c6c66 Wed Mar 11 09:52:31 CDT 2015 Bob Peterson <rpeterso@redhat.com> GFS2: Update master statfs buffer with sd_statfs_spin locked 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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