/* this can be called inside spin lock so use GFP_ATOMIC. */
buf = (char *)__get_free_page(GFP_ATOMIC);
if (buf) {
dentry = d_find_alias(page->mapping->host);
...
if (dentry)
dput(dentry);
If it *can* be called under a spinlock, you have an obvious problem -
dput() can sleep. d_find_alias() might've picked a hashed dentry with
zero refcount that got unhashed by the time of dput(). Or other references
used to exist, but got dropped by that point...
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