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ovl: allocate anon bdev per unique lower fs

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Instead of allocating an anonymous bdev per lower layer, allocate
one anonymous bdev per every unique lower fs that is different than
upper fs.

Every unique lower fs is assigned an fsid > 0 and the number of
unique lower fs are stored in ofs->numlowerfs.

The assigned fsid is stored in the lower layer struct and will be
used also for inode number multiplexing.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein
2018-03-28 20:22:41 +03:00
committed by Miklos Szeredi
parent da309e8c05
commit 5148626b80
4 changed files with 72 additions and 28 deletions
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7
fs/overlayfs/util.c
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@@ -47,7 +47,12 @@ struct super_block *ovl_same_sb(struct super_block *sb)
{
struct ovl_fs *ofs = sb->s_fs_info;
return ofs->same_sb;
if (!ofs->numlowerfs)
return ofs->upper_mnt->mnt_sb;
else if (ofs->numlowerfs == 1 && !ofs->upper_mnt)
return ofs->lower_fs[0].sb;
else
return NULL;
}
bool ovl_can_decode_fh(struct super_block *sb)