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f2fs: fix to reserve space for IO align feature

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commit 300a842937fbcfb5a189cea9ba15374fdb0b5c6b upstream.

https://bugzilla.kernel.org/show_bug.cgi?id=204137

With below script, we will hit panic during new segment allocation:

DISK=bingo.img
MOUNT_DIR=/mnt/f2fs

dd if=/dev/zero of=$DISK bs=1M count=105
mkfs.f2fe -a 1 -o 19 -t 1 -z 1 -f -q $DISK

mount -t f2fs $DISK $MOUNT_DIR -o "noinline_dentry,flush_merge,noextent_cache,mode=lfs,io_bits=7,fsync_mode=strict"

for (( i = 0; i < 4096; i++ )); do
	name=`head /dev/urandom | tr -dc A-Za-z0-9 | head -c 10`
	mkdir $MOUNT_DIR/$name
done

umount $MOUNT_DIR
rm $DISK
This commit is contained in:
Chao Yu
2021-12-11 21:27:36 +08:00
committed by Greg Kroah-Hartman
parent 39ad058117
commit a49e402f23
4 changed files with 60 additions and 2 deletions
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3
fs/f2fs/segment.h
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@@ -539,7 +539,8 @@ static inline unsigned int free_segments(struct f2fs_sb_info *sbi)
static inline unsigned int reserved_segments(struct f2fs_sb_info *sbi)
{
return SM_I(sbi)->reserved_segments;
return SM_I(sbi)->reserved_segments +
SM_I(sbi)->additional_reserved_segments;
}
static inline unsigned int free_sections(struct f2fs_sb_info *sbi)