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new helper: ihold()

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Clones an existing reference to inode; caller must already hold one.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2010-10-23 11:11:40 -04:00
parent 646ec4615c
commit 7de9c6ee3e
40 changed files with 57 additions and 49 deletions
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9
fs/inode.c
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@ -320,6 +320,15 @@ void __iget(struct inode *inode)
atomic_inc(&inode->i_count);
}
/*
* get additional reference to inode; caller must already hold one.
*/
void ihold(struct inode *inode)
{
WARN_ON(atomic_inc_return(&inode->i_count) < 2);
}
EXPORT_SYMBOL(ihold);
static void inode_lru_list_add(struct inode *inode)
{
if (list_empty(&inode->i_list)) {