d0c447180b
Some files in the net/9p directory uses "int" for flags. This can cause hard to find bugs on some architectures. This patch converts the flags to use "long" instead. This bug was discovered by doing an allyesconfig make on the -rt kernel where checks are done to ensure all flags are of size sizeof(long). Signed-off-by: Steven Rostedt <srostedt@redhat.com> Acked-by: Eric Van Hensbergen <ericvh@gmail.com>
142 lines
3.1 KiB
C
142 lines
3.1 KiB
C
/*
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* net/9p/util.c
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*
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* This file contains some helper functions
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*
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* Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
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* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/sched.h>
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#include <linux/parser.h>
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#include <linux/idr.h>
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#include <net/9p/9p.h>
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/**
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* struct p9_idpool - per-connection accounting for tag idpool
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* @lock: protects the pool
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* @pool: idr to allocate tag id from
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*
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*/
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struct p9_idpool {
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spinlock_t lock;
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struct idr pool;
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};
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/**
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* p9_idpool_create - create a new per-connection id pool
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*
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*/
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struct p9_idpool *p9_idpool_create(void)
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{
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struct p9_idpool *p;
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p = kmalloc(sizeof(struct p9_idpool), GFP_KERNEL);
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if (!p)
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return ERR_PTR(-ENOMEM);
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spin_lock_init(&p->lock);
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idr_init(&p->pool);
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return p;
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}
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EXPORT_SYMBOL(p9_idpool_create);
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/**
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* p9_idpool_destroy - create a new per-connection id pool
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* @p: idpool to destory
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*/
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void p9_idpool_destroy(struct p9_idpool *p)
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{
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idr_destroy(&p->pool);
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kfree(p);
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}
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EXPORT_SYMBOL(p9_idpool_destroy);
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/**
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* p9_idpool_get - allocate numeric id from pool
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* @p: pool to allocate from
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*
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* Bugs: This seems to be an awful generic function, should it be in idr.c with
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* the lock included in struct idr?
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*/
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int p9_idpool_get(struct p9_idpool *p)
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{
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int i = 0;
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int error;
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unsigned long flags;
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retry:
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if (idr_pre_get(&p->pool, GFP_KERNEL) == 0)
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return 0;
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spin_lock_irqsave(&p->lock, flags);
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/* no need to store exactly p, we just need something non-null */
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error = idr_get_new(&p->pool, p, &i);
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spin_unlock_irqrestore(&p->lock, flags);
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if (error == -EAGAIN)
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goto retry;
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else if (error)
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return -1;
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return i;
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}
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EXPORT_SYMBOL(p9_idpool_get);
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/**
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* p9_idpool_put - release numeric id from pool
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* @id: numeric id which is being released
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* @p: pool to release id into
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*
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* Bugs: This seems to be an awful generic function, should it be in idr.c with
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* the lock included in struct idr?
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*/
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void p9_idpool_put(int id, struct p9_idpool *p)
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{
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unsigned long flags;
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spin_lock_irqsave(&p->lock, flags);
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idr_remove(&p->pool, id);
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spin_unlock_irqrestore(&p->lock, flags);
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}
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EXPORT_SYMBOL(p9_idpool_put);
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/**
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* p9_idpool_check - check if the specified id is available
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* @id: id to check
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* @p: pool to check
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*/
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int p9_idpool_check(int id, struct p9_idpool *p)
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{
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return idr_find(&p->pool, id) != NULL;
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}
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EXPORT_SYMBOL(p9_idpool_check);
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