fs/ext4/extents_status.c

27  * extent tree, whose goal is only track delayed extents in memory to
34  * Currently the first step has been done.  All delayed extents are
35  * tracked in the tree.  It maintains the delayed extent when a delayed
36  * allocation is issued, and the delayed extent is written out or
53  * are under high memory pressure.  Delayed extents will not be
66  * Without extent status tree, ext4 identifies a delayed extent by looking
71  * block or a range of blocks are belonged to a delayed extent.
75  *	FIEMAP looks up page cache to identify delayed allocations from holes.
82  *	already under delayed allocation or not to determine whether
87  *	mapped, If there are not very many delayed buffers, then it is
92  * blocks is under delayed allocation(belonged to a delayed extent) or
112  *	There are three important operations on a delayed extent tree: find
139  *   -- Refactor delayed space reservation
208  * search through the tree for an delayed extent with a given offset.  If
559 	/* we need to check delayed extent is without unwritten status */  in ext4_es_can_be_merged()
644 		 * a delayed/hole extent.  in ext4_es_insert_extent_ext_check()
651 					"want to add a delayed/hole extent "  in ext4_es_insert_extent_ext_check()
722 			 * We want to add a delayed/hole extent but this  in ext4_es_insert_extent_ind_check()
727 				"delayed/hole extent [%d/%d/%llu/%x]\n",  in ext4_es_insert_extent_ind_check()
874 				" delayed and written which can potentially "  in ext4_es_insert_extent()
1101  * count_rsvd - count the clusters containing delayed and not unwritten
1232  * clusters containing delayed and not unwritten (delonly) blocks within
1361  * If @reserved is not NULL and delayed allocation is enabled, counts
2055  * ext4_es_insert_delayed_block - adds a delayed block to the extents status
2076 	es_debug("add [%u/1) delayed to extent status tree of inode %lu\n",  in ext4_es_insert_delayed_block()
2136  *                    are delayed only
2142  * Returns the number of clusters containing only delayed (not delayed
2144  * cluster or part of a cluster within the range and containing a delayed
2192  *                       are both delayed and unwritten
2225  *                    upon the presence or absence of delayed blocks
2255 	 * as if it does not contain a delayed extent.  The new range may  in __revise_pending()
2256 	 * have allocated space for previously delayed blocks out to the  in __revise_pending()