Commit fbd2d207 authored Nov 22, 2017 by Amir Goldstein Committed by Miklos Szeredi Jan 24, 2018

ovl: index all non-dir on copy up for NFS export



With the NFS export feature enabled, all non-dir are indexed on copy up.
The copy up origin inode of an indexed non-dir can be used as a unique
identifier of the overlay object.

The full index is also used for consistency verfication, like detecting
multiple non-hardlink uppers with the same 'origin' on lookup.

Directory index on copy up will be implemented by following patch.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

parent 24b33ee1

fs/overlayfs/util.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -473,6 +473,10 @@ bool ovl_need_index(struct dentry *dentry)
		if (!lower \|\| !ovl_indexdir(dentry->d_sb))
		return false;

		/* Index all files for NFS export and consistency verification */
		if (!d_is_dir(lower) && ovl_index_all(dentry->d_sb))
		return true;

		/* Index only lower hardlinks on copy up */
		if (!d_is_dir(lower) && d_inode(lower)->i_nlink > 1)
		return true;

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