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ovl: cleanup orphan index entries

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index entry should live only as long as there are upper or lower
hardlinks.

Cleanup orphan index entries on mount and when dropping the last
overlay inode nlink.

When about to cleanup or link up to orphan index and the index inode
nlink > 1, admit that something went wrong and adjust overlay nlink
to index inode nlink - 1 to prevent it from dropping below zero.
This could happen when adding lower hardlinks underneath a mounted
overlay and then trying to unlink them.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein
2017-06-21 13:46:12 +03:00
committed by Miklos Szeredi
parent 5f8415d6b8
commit caf70cb2ba
5 changed files with 77 additions and 5 deletions
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6
fs/overlayfs/inode.c
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@@ -510,9 +510,9 @@ int ovl_set_nlink_lower(struct dentry *dentry)
return ovl_set_nlink_common(dentry, ovl_dentry_lower(dentry), "L%+i");
}
static unsigned int ovl_get_nlink(struct dentry *lowerdentry,
struct dentry *upperdentry,
unsigned int fallback)
unsigned int ovl_get_nlink(struct dentry *lowerdentry,
struct dentry *upperdentry,
unsigned int fallback)
{
int nlink_diff;
int nlink;