CLSF-2013-ext4-status-report

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1、EXT4StatusUpdate(CLSF2013)ZhengLiu@gnehzuilwenqing.lz@taobao.comPatches?3.8->3.12-rc1–Ext4:30fileschanged,6230insertions(+),4416deletions(-)–Jbd2:7fileschanged,681insertions(+),512deletions(-)–Ext4:45289–Jbd2:8636Overview?3.8–Inlinedata–SEEK_DATA/SEEK_HOLE?3.9–‘PunchHole’fornon-ex

2、tentmappingfile–Extentstatustree?3.10–Reservemetadatafordelayedwrite?3.11–‘PunchHole’forbigalloc?3.12–Extentstatuscache–CorruptedrecoveryExtentStatusCache?Usage:–fiemap(2)withFIEMAP_FLAG_CACHE–ioctl(2)withEXT4_IOC_PRECACHE_EXTENTS?避免AIO路徑等待在get_block_t上PunchHole?原本僅支持extent-based文

3、件?支持indirect-based文件?支持bigalloc文件ReserveMetadataBlock?解決開啟bigalloc后文件在進行delayedwrite時造成元數(shù)據(jù)的技術(shù)錯誤CorruptedRecovery?在blockgroup中加入新的標(biāo)志位，標(biāo)識該blockgroup中的inode/blockbitmap是否損壞?不再對損壞的blockgroup進行寫操作EXT4Workshop?Extenttreelayout(物理地址48bits->64bits)?Unwrittenextentconversion(dioread_nolock

4、)?Rangelocking?OnlineFSCKTODOList?Unwrittenextentconversion?Extenttreelayout?OnlineFSCK?Dirquota謝謝！