tree 2c9ae608ed67b929cc49bb8810458148784b9db3
parent 4a63f6da96e340c2ffd18cf613829afea0999da0
author Seokhwan Kim <sukka.kim@samsung.com> 1622556653 +0900
committer Brett Wilson <brettw@google.com> 1622690640 +0000

[f2fs] Support ssr block allocation

It implements the ssr block allocation, and
it is triggered when # of freesections < # of OP sections.

For testing, it introduces a new gn variable 'f2fs_force_ssr'
that enforces every block allocation in a ssr manner if it is set to true.

Test: fx test fs-tests
Failed tests: RwFullDiskTest.PartialWriteSucceedsForFullDisk/F2fs

Test:
- linux host:
 fx emu -N --headless -hda third_party/f2fs/test_files/blk1g.bin
- fuchsia vm:
 mkdir /tmp/data;mount /dev/class/block/000 /tmp/data
 cp /tmp/data/100mb.bin /tmp/data/100mb.bin.2
 umount /tmp/data;dm shutdown
- linux host:
 fsck.f2fs third_party/f2fs/test_files/blk1g.bin
 mount third_party/f2fs/test_files/blk1g.bin ~/mnt
 diff ~/mnt/100mb.bin ~/mnt/100mb.bin.2
 umount ~/mnt

Prerequisite: set f2fs_force_ssr to true
Change-Id: I0dae89c935797eacba96b34fca56a7e0808d5aa2
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/f2fs/+/536745
Reviewed-by: Brett Wilson <brettw@google.com>