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fold dentry_kill() into dput()

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Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2023-10-31 01:41:22 -04:00
parent 339e9e1353
commit 5e7a5c8d17
1 changed files with 12 additions and 25 deletions
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37
fs/dcache.c
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@ -756,28 +756,6 @@ void d_mark_dontcache(struct inode *inode)
}
EXPORT_SYMBOL(d_mark_dontcache);
/*
* Finish off a dentry we've decided to kill.
* dentry->d_lock must be held, returns with it unlocked.
* Returns dentry requiring refcount drop, or NULL if we're done.
*/
static struct dentry *dentry_kill(struct dentry *dentry)
__releases(dentry->d_lock)
{
dentry->d_lockref.count--;
rcu_read_lock();
if (likely(lock_for_kill(dentry))) {
struct dentry *parent = dentry->d_parent;
rcu_read_unlock();
__dentry_kill(dentry);
return parent != dentry ? parent : NULL;
}
rcu_read_unlock();
spin_unlock(&dentry->d_lock);
return NULL;
}
/*
* Try to do a lockless dput(), and return whether that was successful.
*
@ -915,9 +893,18 @@ void dput(struct dentry *dentry)
}
/* Slow case: now with the dentry lock held */
rcu_read_unlock();
dentry->d_lockref.count = 1;
dentry = dentry_kill(dentry);
if (likely(lock_for_kill(dentry))) {
struct dentry *parent = dentry->d_parent;
rcu_read_unlock();
__dentry_kill(dentry);
if (dentry == parent)
return;
dentry = parent;
} else {
rcu_read_unlock();
spin_unlock(&dentry->d_lock);
return;
}
}
}
EXPORT_SYMBOL(dput);