package/utils/f2fs-tools/patches/200-resize_f2fs-fix_wrong_ovp_calculation.patch

   1 From f056fbeff08d30a6d9acdb9e06704461ceee3500 Mon Sep 17 00:00:00 2001
   2 From: Jaegeuk Kim <jaegeuk@kernel.org>
   3 Date: Thu, 1 Apr 2021 20:13:55 -0700
   4 Subject: resize.f2fs: fix wrong ovp calculation
   5
   6 beroal reported a mount failure due to broken valid_user_blocks.
   7 [ 6890.647749] F2FS-fs (loop0): Wrong valid_user_blocks: 16040048,
   8 user_block_count: 10016768
   9
  10 From fsck,
  11
  12 segment_count_main                      [0x    9a95 : 39573]
  13 -> 39573 * 2MB = 78GB as user space
  14
  15 overprov_segment_count                  [0x    4e29 : 20009]
  16 -> 20009 * 2MB = 40GB as overprovisioned space which user can't see.
  17
  18 But,
  19 [FSCK] valid_block_count matching with CP             [Ok..] [0xf4c070]
  20 -> 0xf4c070 = 16040048
  21
  22 valid_block_count                       [0x  f4c070 : 16040048]
  23 -> So, this is correct.
  24
  25 It turns out resize.f2fs gave very large and wrong overprovisioning space
  26 result in shortage of user blocks. The root cause was f2fs_get_usable_segments()
  27 didn't consider resize case which needs segment_count_main from new superblock.
  28
  29 Fixes: f8410857b7a8 ("f2fs-tools: zns zone-capacity support")
  30 Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
  31 ---
  32  lib/libf2fs_zoned.c | 3 +++
  33  1 file changed, 3 insertions(+)
  34
  35 --- a/lib/libf2fs_zoned.c
  36 +++ b/lib/libf2fs_zoned.c
  37 @@ -495,6 +495,9 @@ uint32_t f2fs_get_usable_segments(struct
  38         int i, j;
  39         uint32_t usable_segs = 0, zone_segs;
  40
  41 +       if (c.func == RESIZE)
  42 +               return get_sb(segment_count_main);
  43 +
  44         for (i = 0; i < c.ndevs; i++) {
  45                 if (c.devices[i].zoned_model != F2FS_ZONED_HM) {
  46                         usable_segs += c.devices[i].total_segments;