Hi all, Here is the sixth version of extent status tree (step2). In this version a regression is fixed when bigalloc and delalloc are enabled, which is triggered by xfstests #13. The root cause is that when an extent is delayed allocated and later is allocated by fallocate it should be as a delayed extent until this extent is written out because we need to use it to update reserved space. That means that in extent status tree an extent could be with unwritten and delayed status simultaneously. As Jan's suggestions, ext4_es_find_delayed_extent is refined. Now it has a input parameter 'lblk' and a output parameter 'es'. Meanwhile this function never return the first block of the next delayed extent after 'es'. In the mean time, in ext4_es_lookup_extent its parameter also is splitted like above. In fifth version, I try to convert unwritten extents from extent status tree in end_io callback function and remove a bogus wait in direct io codepath. But there is a bug. So in this version these patches are dropped. I will give it a try after this patch series is applied. Further, after applied commit (ext4: grab page before starting transaction handle in write_begin()), it seems that we could try to call end_page_writeback() after unwritten io has done using extent status tree. Previously, I have tried to clear page's writeback flag after unwritten extent is converted using extent status tree, but there is a deadlock because in ext4 we always start a transaction handle before grabbing a page. This patch set can be applied against 3.8-rc7 and 'dev' branch of ext4 directly. changelog: v6 <- v5: - fix a regression that is reported by xfstests #13 with bigalloc - improve ext4_es_find_delayed_extent according to Jan's suggestions - improve ext4_es_lookup_extent according to Jan's suggestions - drop patches that convert unwritten extents in status tree and remove a bogus wait in ext4_ind_direct_IO() - add a comment to describe why es_lblk can be changed directly in __es_insert_extent() v5: http://lwn.net/Articles/537371/ v4: http://lwn.net/Articles/536037/ v3: http://lwn.net/Articles/533730/ v2: http://lwn.net/Articles/532446/ v1: http://lwn.net/Articles/531065/ Any feedbacks are always welcome. Thanks, - Zheng Zheng Liu (9): ext4: refine extent status tree ext4: add physical block and status member into extent status tree ext4: ext4_es_find_extent improvement ext4: let ext4_ext_map_blocks return EXT4_MAP_UNWRITTEN flag ext4: track all extent status in extent status tree ext4: lookup block mapping in extent status tree ext4: remove single extent cache ext4: adjust some functions for reclaiming extents from extent status tree ext4: reclaim extents from extent status tree fs/ext4/ext4.h | 24 +- fs/ext4/ext4_extents.h | 6 - fs/ext4/extents.c | 234 ++++++----------- fs/ext4/extents_status.c | 625 ++++++++++++++++++++++++++++++++------------ fs/ext4/extents_status.h | 83 +++++- fs/ext4/file.c | 14 +- fs/ext4/inode.c | 153 ++++++++--- fs/ext4/move_extent.c | 3 - fs/ext4/super.c | 8 +- include/trace/events/ext4.h | 189 +++++++++++--- 10 files changed, 914 insertions(+), 425 deletions(-) -- 1.7.12.rc2.18.g61b472e -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
