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

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

Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Reviewed-by: Jingbo Xu <jefflexu@linux.alibaba.com>
Signed-off-by: Hongzhen Luo <hongzhen@linux.alibaba.com>
Link: https://lore.kernel.org/r/20240409113022.74720-1-hongzhen@linux.alibaba.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Hongzhen Luo 2024-04-09 19:30:22 +08:00 committed by Gao Xiang
parent 0f6273ab46
commit 1872df8dcd
1 changed files with 5 additions and 7 deletions
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12
fs/erofs/super.c
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@ -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;
}