[GIT PULL] erofs fixes for 5.13-rc2

[Gao Xiang]

Hi Linus,

Could you consider this pull request for 5.13-rc2?

This mainly fixes 1 lcluster-sized pclusters for the big pcluster
feature, which can be forcely generated by mkfs as a specific on-disk
case for per-(sub)file compression strategies but missed to handle in
runtime properly. Also, documentation updates are included to fix
the broken illustration due to the ReST conversion by accident and
complete the big pcluster introduction.

All commits have been tested and have been in linux-next. This merges
cleanly with master.

Thanks,
Gao Xiang

The following changes since commit 6efb943b8616ec53a5e444193dccf1af9ad627b5:

  Linux 5.13-rc1 (2021-05-09 14:17:44 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git tags/erofs-for-5.13-rc2-fixes

for you to fetch changes up to 0852b6ca941ef3ff75076e85738877bd3271e1cd:

  erofs: fix 1 lcluster-sized pcluster for big pcluster (2021-05-13 15:58:46 +0800)

----------------------------------------------------------------
Changes since last update:
 - update documentation to fix the broken illustration due to ReST
   conversion by accident at that time and complete the big pcluster
   introduction;

 - fix 1 lcluster-sized pclusters for the big pcluster feature.

----------------------------------------------------------------
Gao Xiang (3):
      erofs: fix broken illustration in documentation
      erofs: update documentation about data compression
      erofs: fix 1 lcluster-sized pcluster for big pcluster

 Documentation/filesystems/erofs.rst | 175 +++++++++++++++++++++---------------
 fs/erofs/zmap.c                     |  21 ++++-
 2 files changed, 121 insertions(+), 75 deletions(-)