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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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4
fs/f2fs/sysfs.c
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@@ -330,7 +330,9 @@ out:
if (a->struct_type == RESERVED_BLOCKS) {
spin_lock(&sbi->stat_lock);
if (t > (unsigned long)(sbi->user_block_count -
F2FS_OPTION(sbi).root_reserved_blocks)) {
F2FS_OPTION(sbi).root_reserved_blocks -
sbi->blocks_per_seg *
SM_I(sbi)->additional_reserved_segments)) {
spin_unlock(&sbi->stat_lock);
return -EINVAL;
}