Zheng Liu d100eef244 ext4: lookup block mapping in extent status tree ... After tracking all extent status, we already have a extent cache in memory. Every time we want to lookup a block mapping, we can first try to lookup it in extent status tree to avoid a potential disk I/O. A new function called ext4_es_lookup_extent is defined to finish this work. When we try to lookup a block mapping, we always call ext4_map_blocks and/or ext4_da_map_blocks. So in these functions we first try to lookup a block mapping in extent status tree. A new flag EXT4_GET_BLOCKS_NO_PUT_HOLE is used in ext4_da_map_blocks in order not to put a hole into extent status tree because this hole will be converted to delayed extent in the tree immediately. Signed-off-by: Zheng Liu <wenqing.lz@taobao.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: Jan kara <jack@suse.cz>		2013-02-18 00:29:59 -05:00
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events	ext4: lookup block mapping in extent status tree	2013-02-18 00:29:59 -05:00
define_trace.h	treewide: fix comment/printk/variable typos	2012-09-01 10:33:05 -07:00
ftrace.h	tracing: Kill unused and puzzled sample code in ftrace.h	2012-11-13 15:51:21 -05:00
syscall.h	tracing: Cleanup unnecessary function declarations	2012-10-31 16:45:34 -04:00