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net/9p/util.c
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/* * net/9p/util.c * * This file contains some helper functions * * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to: * Free Software Foundation * 51 Franklin Street, Fifth Floor * Boston, MA 02111-1301 USA * */ #include <linux/module.h> #include <linux/errno.h> #include <linux/fs.h> #include <linux/sched.h> #include <linux/parser.h> #include <linux/idr.h> |
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#include <linux/slab.h> |
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#include <net/9p/9p.h> |
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/** * struct p9_idpool - per-connection accounting for tag idpool * @lock: protects the pool * @pool: idr to allocate tag id from * */ |
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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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/** * p9_idpool_create - create a new per-connection id pool * */ |
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struct p9_idpool *p9_idpool_create(void) { struct p9_idpool *p; p = kmalloc(sizeof(struct p9_idpool), GFP_KERNEL); if (!p) return ERR_PTR(-ENOMEM); |
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spin_lock_init(&p->lock); |
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idr_init(&p->pool); return p; } EXPORT_SYMBOL(p9_idpool_create); |
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/** * p9_idpool_destroy - create a new per-connection id pool |
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* @p: idpool to destroy |
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*/ |
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void p9_idpool_destroy(struct p9_idpool *p) { idr_destroy(&p->pool); kfree(p); } EXPORT_SYMBOL(p9_idpool_destroy); /** * 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? */ int p9_idpool_get(struct p9_idpool *p) { int i = 0; 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_NOFS) == 0) |
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return -1; |
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|
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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 */ 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) goto retry; else if (error) return -1; |
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p9_debug(P9_DEBUG_MUX, " id %d pool %p ", i, p); |
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return i; } EXPORT_SYMBOL(p9_idpool_get); /** * p9_idpool_put - release numeric id from pool |
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* @id: numeric id which is being released * @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? */ void p9_idpool_put(int id, struct p9_idpool *p) { |
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unsigned long flags; |
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|
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p9_debug(P9_DEBUG_MUX, " id %d pool %p ", id, p); |
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|
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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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} EXPORT_SYMBOL(p9_idpool_put); /** * p9_idpool_check - check if the specified id is available |
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* @id: id to check * @p: pool to check |
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*/ |
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int p9_idpool_check(int id, struct p9_idpool *p) { return idr_find(&p->pool, id) != NULL; } EXPORT_SYMBOL(p9_idpool_check); |
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