20 #include "recovery.h"
349  * dlm/gfs2 recovery coordination using dlm_recover callbacks
355  *  4. dlm_controld starts and finishes its own user level recovery
356  *  5. dlm_controld starts dlm-kernel dlm_recoverd to do kernel recovery
358  *  7. dlm_recoverd does its own lock recovery
364  * 13. gfs2_recover provides recovery results to gfs2_control (recovery_result)
368  * - failures during recovery
395  * - parallel recovery steps across all nodes
410  *   and missing a journal recovery?
421  * require recovery, because the mount in step 4 could not have
425  * and returning.  The mount in step 4 waits until the recovery in
431  * and recover any that need recovery before other nodes are allowed
441  * The mounted_lock is demoted to PR when first recovery is done, so
445  * mounter is doing first mount recovery of all journals.
448  * the first mount recovery, blocking mounts from other nodes, then demotes
456  * do first mounter recovery
468  * - mount during recovery
470  * If a node mounts while others are doing recovery (not first mounter),
486  * that jid N needs recovery.
645 	 * FIRST_MOUNT means this node is doing first mounter recovery,  in gfs2_control_func()
646 	 * for which recovery control is handled by  in gfs2_control_func()
661 	 * dlm recovery is in progress and dlm locking is blocked.  in gfs2_control_func()
670 	 * dlm_recoverd adds to recover_submit[] jids needing recovery  in gfs2_control_func()
671 	 * gfs2_recover adds to recover_result[] journal recovery results  in gfs2_control_func()
677 	 * the journal recovery is SUCCESS  in gfs2_control_func()
705 		 * in succession.  Only the first will really do recovery,  in gfs2_control_func()
707 		 * recovery.  So, another node may have already recovered  in gfs2_control_func()
771 	 * and clear a jid bit in the lvb if the recovery is a success.  in gfs2_control_func()
788 	 * No more jid bits set in lvb, all recovery is done, unblock locks  in gfs2_control_func()
856 	 * Other nodes need to do some work in dlm recovery and gfs2_control  in control_mount()
879 	 * we cannot do the first-mount responsibility it implies: recovery.  in control_mount()
925 		/* first mounter, keep both EX while doing first recovery */  in control_mount()
946 		/* journals need recovery, wait until all are clear */  in control_mount()
947 		fs_info(sdp, "control_mount wait for journal recovery\n");  in control_mount()
958 		   generation, which might include new recovery bits set */  in control_mount()
960 			fs_info(sdp, "Recovery is required. Waiting for a "  in control_mount()
975 		   latest recovery generation */  in control_mount()
984 		/* dlm recovery in progress, wait for it to finish */  in control_mount()
1029 		 * Wait for the end of a dlm recovery cycle to switch from  in control_first_done()
1030 		 * first mounter recovery.  We can ignore any recover_slot  in control_first_done()
1033 		 * have not fully mounted, so they don't need recovery.  in control_first_done()
1130 /* dlm calls before it does lock recovery */
1184 /* dlm calls after recover_slot and after it completes lock recovery */
1216 /* gfs2_recover thread has a journal recovery result */
1231 	/* don't care about the recovery of own journal during mount */  in gdlm_recovery_result()
1392 	/* mounted_lock and control_lock will be purged in dlm recovery */  in gdlm_unmount()