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ovl: simplify ovl_same_sb() helper

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No code uses the sb returned from this helper, so make it retrun a boolean
and rename it to ovl_same_fs().

The xino mode is irrelevant when all layers are on same fs, so instead of
describing samefs with mode OVL_XINO_OFF, use a new xino_mode state, which
is 0 in the case of samefs, -1 in the case of xino=off and > 0 with xino
enabled.

Create a new helper ovl_same_dev(), to use instead of the common check for
(ovl_same_fs() || xinobits).

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein
2019-11-16 18:14:41 +02:00
committed by Miklos Szeredi
parent 94375f9d51
commit 0f831ec85e
6 changed files with 37 additions and 34 deletions
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12
fs/overlayfs/util.c
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@@ -40,18 +40,6 @@ const struct cred *ovl_override_creds(struct super_block *sb)
return override_creds(ofs->creator_cred);
}
struct super_block *ovl_same_sb(struct super_block *sb)
{
struct ovl_fs *ofs = sb->s_fs_info;
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;
}
/*
* Check if underlying fs supports file handles and try to determine encoding
* type, in order to deduce maximum inode number used by fs.