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f2fs: fix to avoid running out of free segments

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[ Upstream commit f7f8932ca6 ]

If checkpoint is disabled, GC can not reclaim any segments, we need
to detect such condition and bail out from fallocate() of a pinfile,
rather than letting allocator running out of free segment, which may
cause f2fs to be shutdown.

reproducer:
mkfs.f2fs -f /dev/vda 16777216
mount -o checkpoint=disable:10% /dev/vda /mnt/f2fs
for ((i=0;i<4096;i++)) do { dd if=/dev/zero of=/mnt/f2fs/$i bs=1M count=1; } done
sync
for ((i=0;i<4096;i+=2)) do { rm /mnt/f2fs/$i; } done
sync
touch /mnt/f2fs/pinfile
f2fs_io pinfile set /mnt/f2fs/pinfile
f2fs_io fallocate 0 0 4201644032 /mnt/f2fs/pinfile

cat /sys/kernel/debug/f2fs/status
output:
  - Free: 0 (0)

Fixes: f5a53edcf0 ("f2fs: support aligned pinned file")
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Stable-dep-of: e462fc48ce ("f2fs: maintain one time GC mode is enabled during whole zoned GC cycle")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chao Yu 2025-03-12 17:01:25 +08:00 • committed by Greg Kroah-Hartman
commit 65e42a7084
1 changed files with 12 additions and 0 deletions
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