linux-toradex.git/fs/f2fs/gc.c, branch v5.8-rc2

f2fs: add compressed/gc data read IO stat

2020-05-12T03:37:13+00:00

in order to account data read IOs more accurately.

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

f2fs: refactor resize_fs to avoid meta updates in progress

2020-05-12T03:37:13+00:00

Sahitya raised an issue:
- prevent meta updates while checkpoint is in progress

allocate_segment_for_resize() can cause metapage updates if
it requires to change the current node/data segments for resizing.
Stop these meta updates when there is a checkpoint already
in progress to prevent inconsistent CP data.

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

f2fs: support read iostat

2020-04-17T16:17:00+00:00

Adds to support accounting read IOs from userspace/kernel.

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

f2fs: don't trigger data flush in foreground operation

2020-03-31T03:46:24+00:00

Data flush can generate heavy IO and cause long latency during
flush, so it's not appropriate to trigger it in foreground
operation.

And also, we may face below potential deadlock during data flush:
- f2fs_write_multi_pages
 - f2fs_write_raw_pages
  - f2fs_write_single_data_page
   - f2fs_balance_fs
    - f2fs_balance_fs_bg
     - f2fs_sync_dirty_inodes
      - filemap_fdatawrite   -- stuck on flush same cluster

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

f2fs: fix to update f2fs_super_block fields under sb_lock

2020-03-23T04:16:29+00:00

Fields in struct f2fs_super_block should be updated under coverage
of sb_lock, fix to adjust update_sb_metadata() for that rule.

Fixes: 04f0b2eaa3b3 ("f2fs: ioctl for removing a range from F2FS")
Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: Fix mount failure due to SPO after a successful online resize FS

2020-03-23T04:16:28+00:00

Even though online resize is successfully done, a SPO immediately
after resize, still causes below error in the next mount.

[   11.294650] F2FS-fs (sda8): Wrong user_block_count: 2233856
[   11.300272] F2FS-fs (sda8): Failed to get valid F2FS checkpoint

This is because after FS metadata is updated in update_fs_metadata()
if the SBI_IS_DIRTY is not dirty, then CP will not be done to reflect
the new user_block_count.

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

f2fs: skip migration only when BG_GC is called

2020-03-19T18:41:26+00:00

FG_GC needs to move entire section more quickly.

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

f2fs: introduce DEFAULT_IO_TIMEOUT

2020-03-19T18:41:26+00:00

As Geert Uytterhoeven reported:

for parameter HZ/50 in congestion_wait(BLK_RW_ASYNC, HZ/50);

On some platforms, HZ can be less than 50, then unexpected 0 timeout
jiffies will be set in congestion_wait().

This patch introduces a macro DEFAULT_IO_TIMEOUT to wrap a determinate
value with msecs_to_jiffies(20) to instead HZ/50 to avoid such issue.

Quoted from Geert Uytterhoeven:

"A timeout of HZ means 1 second.
HZ/50 means 20 ms, but has the risk of being zero, if HZ < 50.

If you want to use a timeout of 20 ms, you best use msecs_to_jiffies(20),
as that takes care of the special cases, and never returns 0."

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

f2fs: skip GC when section is full

2020-03-19T18:41:26+00:00

This fixes skipping GC when segment is full in large section.

Signed-off-by: Jaegeuk Kim

f2fs: add migration count iff migration happens

2020-03-19T18:41:26+00:00

If first segment is empty and migration_granularity is 1, we can't move this
at all.

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