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v0.6.0
v0.6.0
https://github.com/torvalds/linux
Revision e57101991156aaba97c630f38e880f0d4012edcd authored by J.Bruce Fields on 13 December 2006, 08:35:20 UTC, committed by Linus Torvalds on 13 December 2006, 17:05:53 UTC
A comment here incorrectly states that "slack_space" is measured in words, not bytes. Remove the comment, and adjust a variable name and a few comments to clarify the situation. This is pure cleanup; there should be no change in functionality. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1 parent b797b5b
Tip revision: e57101991156aaba97c630f38e880f0d4012edcd authored by J.Bruce Fields on 13 December 2006, 08:35:20 UTC
[PATCH] knfsd: nfsd4: clarify units of COMPOUND_SLACK_SPACE
[PATCH] knfsd: nfsd4: clarify units of COMPOUND_SLACK_SPACE
Tip revision: e571019
kref.c
/*
* kref.c - library routines for handling generic reference counted objects
*
* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2004 IBM Corp.
*
* based on lib/kobject.c which was:
* Copyright (C) 2002-2003 Patrick Mochel <mochel@osdl.org>
*
* This file is released under the GPLv2.
*
*/
#include <linux/kref.h>
#include <linux/module.h>
/**
* kref_init - initialize object.
* @kref: object in question.
*/
void kref_init(struct kref *kref)
{
atomic_set(&kref->refcount,1);
}
/**
* kref_get - increment refcount for object.
* @kref: object.
*/
void kref_get(struct kref *kref)
{
WARN_ON(!atomic_read(&kref->refcount));
atomic_inc(&kref->refcount);
}
/**
* kref_put - decrement refcount for object.
* @kref: object.
* @release: pointer to the function that will clean up the object when the
* last reference to the object is released.
* This pointer is required, and it is not acceptable to pass kfree
* in as this function.
*
* Decrement the refcount, and if 0, call release().
* Return 1 if the object was removed, otherwise return 0. Beware, if this
* function returns 0, you still can not count on the kref from remaining in
* memory. Only use the return value if you want to see if the kref is now
* gone, not present.
*/
int kref_put(struct kref *kref, void (*release)(struct kref *kref))
{
WARN_ON(release == NULL);
WARN_ON(release == (void (*)(struct kref *))kfree);
/*
* if current count is one, we are the last user and can release object
* right now, avoiding an atomic operation on 'refcount'
*/
if ((atomic_read(&kref->refcount) == 1) ||
(atomic_dec_and_test(&kref->refcount))) {
release(kref);
return 1;
}
return 0;
}
EXPORT_SYMBOL(kref_init);
EXPORT_SYMBOL(kref_get);
EXPORT_SYMBOL(kref_put);
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