kernel/git/stable/linux.git/fs/f2fs/segment.c, branch linux-4.11.y

f2fs: Make flush bios explicitely sync

2017-05-20T12:49:49+00:00

commit 3adc5fcb7edf5f8dfe8d37dcb50ba6b30077c905 upstream. Commit b685d3d65ac7 "block: treat REQ_FUA and REQ_PREFLUSH as synchronous" removed REQ_SYNC flag from WRITE_{FUA|PREFLUSH|...} definitions. generic_make_request_checks() however strips REQ_FUA and REQ_PREFLUSH flags from a bio when the storage doesn't report volatile write cache and thus write effectively becomes asynchronous which can lead to performance regressions. Fix the problem by making sure all bios which are synchronous are properly marked with REQ_SYNC. Fixes: b685d3d65ac791406e0dfd8779cc9b3707fea5a3 CC: Jaegeuk Kim CC: linux-f2fs-devel@lists.sourceforge.net Signed-off-by: Jan Kara Acked-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Greg Kroah-Hartman

Revert "f2fs: put allocate_segment after refresh_sit_entry"

2017-05-20T12:49:48+00:00

commit c6f82fe90d7458e5fa190a6820bfc24f96b0de4e upstream. This reverts commit 3436c4bdb30de421d46f58c9174669fbcfd40ce0. This makes a leak to register dirty segments. I reproduced the issue by modified postmark which injects a lot of file create/delete/update and finally triggers huge number of SSR allocations. [Jaegeuk Kim: Change missing incorrect comment] Signed-off-by: Jaegeuk Kim Signed-off-by: Greg Kroah-Hartman

f2fs: don't overwrite node block by SSR

2017-03-20T14:00:14+00:00

This patch fixes that SSR can overwrite previous warm node block consisting of a node chain since the last checkpoint. Fixes: 5b6c6be2d878 ("f2fs: use SSR for warm node as well") Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim

f2fs: avoid to issue redundant discard commands

2017-02-27T21:44:08+00:00

If segs_per_sec is over 1 like under SMR, previously f2fs issues discard commands redundantly on the same section, since we didn't move end position for the previous discard command. E.g., start end | | prefree_bitmap = [01111100111100] And, after issue discard for this section, end start | | prefree_bitmap = [01111100111100] Select this section again by searching from (end + 1), start end | | prefree_bitmap = [01111100111100] Fixes: 36abef4e796d38 ("f2fs: introduce mode=lfs mount option") Cc: Cc: Damien Le Moal Signed-off-by: Jaegeuk Kim

f2fs: select target segment with closer temperature in SSR mode

2017-02-27T17:59:56+00:00

In SSR mode, we can allocate target segment which has different temperature type from the type of current block, in order to avoid mixing coldest and hottest data/node as much as possible, change SSR allocation policy to select closer temperature for current block prior. Signed-off-by: Yunlong Song Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim

f2fs: show simple call stack in fault injection message

2017-02-27T17:59:55+00:00

Previously kernel message can show that in which function we do the injection, but unfortunately, most of the caller are the same, for tracking more information of injection path, it needs to show upper caller's name. This patch supports that ability. Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim

f2fs: add bitmaps for empty or full NAT blocks

2017-02-27T17:59:54+00:00

This patches adds bitmaps to represent empty or full NAT blocks containing free nid entries. If we can find valid crc|cp_ver in the last block of checkpoint pack, we'll use these bitmaps when building free nids. In order to avoid checkpointing burden, up-to-date bitmaps will be flushed only during umount time. So, normally we can get this gain, but when power-cut happens, we rely on fsck.f2fs which recovers this bitmap again. After this patch, we build free nids from nid #0 at mount time to make more full NAT blocks, but in runtime, we check empty NAT blocks to load free nids without loading any NAT pages from disk. Signed-off-by: Jaegeuk Kim

f2fs: check discard alignment only for SEQWRITE zones

2017-02-27T17:59:46+00:00

For converntional zones, we don't need to align discard commands to exact zone size. Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim

f2fs: wait for discard completion after submission

2017-02-27T17:59:39+00:00

We don't need to wait for each discard commands when unmounting the image. Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim

f2fs: avoid very large discard command

2017-02-27T17:59:20+00:00

This patch adds MAX_DISCARD_BLOCKS() to avoid issuing too much large single discard command. Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim