Commit 1872df8d authored by Hongzhen Luo's avatar Hongzhen Luo Committed by Gao Xiang
Browse files

erofs: derive fsid from on-disk UUID for .statfs() if possible 



Use the superblock's UUID to generate the fsid when it's non-null.

Reviewed-by: default avatarGao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: default avatarJingbo Xu <jefflexu@linux.alibaba.com>
Signed-off-by: default avatarHongzhen Luo <hongzhen@linux.alibaba.com>
Link: https://lore.kernel.org/r/20240409113022.74720-1-hongzhen@linux.alibaba.com


Signed-off-by: default avatarGao Xiang <hsiangkao@linux.alibaba.com>
parent 0f6273ab

fs/erofs/super.c

+5 −7
Original line number Diff line number Diff line
@@ -914,22 +914,20 @@ static int erofs_statfs(struct dentry *dentry, struct kstatfs *buf) 
{

	struct super_block *sb = dentry->d_sb;

	struct erofs_sb_info *sbi = EROFS_SB(sb);

	u64 id = 0;



	if (!erofs_is_fscache_mode(sb))

		id = huge_encode_dev(sb->s_bdev->bd_dev);



	buf->f_type = sb->s_magic;

	buf->f_bsize = sb->s_blocksize;

	buf->f_blocks = sbi->total_blocks;

	buf->f_bfree = buf->f_bavail = 0;



	buf->f_files = ULLONG_MAX;

	buf->f_ffree = ULLONG_MAX - sbi->inos;



	buf->f_namelen = EROFS_NAME_LEN;



	buf->f_fsid    = u64_to_fsid(id);

	if (uuid_is_null(&sb->s_uuid))

		buf->f_fsid = u64_to_fsid(erofs_is_fscache_mode(sb) ? 0 :

				huge_encode_dev(sb->s_bdev->bd_dev));

	else

		buf->f_fsid = uuid_to_fsid(sb->s_uuid.b);

	return 0;

}