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ovl: split out ovl_get_upper() from ovl_fill_super()

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And don't clobber ufs->upper_mnt on error.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2017-11-09 10:23:28 +01:00
parent 53dbb0b478
commit 21a3b317a6
1 changed files with 19 additions and 8 deletions
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27
fs/overlayfs/super.c
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@ -895,6 +895,23 @@ static int ovl_get_workpath(struct ovl_fs *ufs, struct path *upperpath,
return err;
}
static int ovl_get_upper(struct ovl_fs *ufs, struct path *upperpath)
{
struct vfsmount *upper_mnt;
upper_mnt = clone_private_mount(upperpath);
if (IS_ERR(upper_mnt)) {
pr_err("overlayfs: failed to clone upperpath\n");
return PTR_ERR(upper_mnt);
}
/* Don't inherit atime flags */
upper_mnt->mnt_flags &= ~(MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME);
ufs->upper_mnt = upper_mnt;
return 0;
}
static int ovl_get_lowerstack(struct super_block *sb, struct ovl_fs *ufs,
struct path **stackp, unsigned int *stacklenp)
{
@ -1018,15 +1035,9 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
goto out_unlock_workdentry;
if (ufs->config.upperdir) {
ufs->upper_mnt = clone_private_mount(&upperpath);
err = PTR_ERR(ufs->upper_mnt);
if (IS_ERR(ufs->upper_mnt)) {
pr_err("overlayfs: failed to clone upperpath\n");
err = ovl_get_upper(ufs, &upperpath);
if (err)
goto out_put_lowerpath;
}
/* Don't inherit atime flags */
ufs->upper_mnt->mnt_flags &= ~(MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME);
sb->s_time_gran = ufs->upper_mnt->mnt_sb->s_time_gran;