linux.git/fs/f2fs/segment.c, branch v4.11

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

f2fs: do SSR for node segments more aggresively

2017-02-24T18:01:41+00:00

This patch gives more SSR chances for node blocks.

Reviewed-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: find data segments across all the types

2017-02-24T18:01:08+00:00

Previously, if type is CURSEG_HOT_DATA, we only check CURSEG_HOT_DATA only.
This patch fixes to search all the different types for SSR.

Reviewed-by: Chao Yu 
Signed-off-by: Jaegeuk Kim