ext4: synchronize ext4_mb_init_group() with buddy page lock
The old routines ext4_mb_[get|put]_buddy_cache_lock(), which used to take grp->alloc_sem for all groups on the buddy page have been replaced with the routines ext4_mb_[get|put]_buddy_page_lock(). The new routines take both buddy and bitmap page locks to protect against concurrent init of groups on the same buddy page. The GROUP_NEED_INIT flag is tested again under page lock to check if the group was initialized by another caller. Signed-off-by: Amir Goldstein <amir73il@users.sf.net> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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