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ovl: decode lower file handles of unlinked but open files

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Lookup overlay inode in cache by origin inode, so we can decode a file
handle of an open file even if the index has a whiteout index entry to
mark this overlay inode was unlinked.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein
2017-12-24 18:28:04 +02:00
committed by Miklos Szeredi
parent f71bd9cfb6
commit 9436a1a339
3 changed files with 38 additions and 2 deletions
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16
fs/overlayfs/inode.c
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@@ -645,6 +645,22 @@ static bool ovl_verify_inode(struct inode *inode, struct dentry *lowerdentry,
return true;
}
struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *origin)
{
struct inode *inode, *key = d_inode(origin);
inode = ilookup5(sb, (unsigned long) key, ovl_inode_test, key);
if (!inode)
return NULL;
if (!ovl_verify_inode(inode, origin, NULL)) {
iput(inode);
return ERR_PTR(-ESTALE);
}
return inode;
}
struct inode *ovl_get_inode(struct super_block *sb, struct dentry *upperdentry,
struct dentry *lowerdentry, struct dentry *index,
unsigned int numlower)