]>
git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - net/9p/util.c
4 * This file contains some helper functions
6 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
7 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
8 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2
12 * as published by the Free Software Foundation.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to:
21 * Free Software Foundation
22 * 51 Franklin Street, Fifth Floor
23 * Boston, MA 02111-1301 USA
27 #include <linux/module.h>
28 #include <linux/errno.h>
30 #include <linux/sched.h>
31 #include <linux/parser.h>
32 #include <linux/idr.h>
33 #include <linux/slab.h>
34 #include <net/9p/9p.h>
37 * struct p9_idpool - per-connection accounting for tag idpool
38 * @lock: protects the pool
39 * @pool: idr to allocate tag id from
49 * p9_idpool_create - create a new per-connection id pool
53 struct p9_idpool
*p9_idpool_create(void)
57 p
= kmalloc(sizeof(struct p9_idpool
), GFP_KERNEL
);
59 return ERR_PTR(-ENOMEM
);
61 spin_lock_init(&p
->lock
);
66 EXPORT_SYMBOL(p9_idpool_create
);
69 * p9_idpool_destroy - create a new per-connection id pool
70 * @p: idpool to destroy
73 void p9_idpool_destroy(struct p9_idpool
*p
)
75 idr_destroy(&p
->pool
);
78 EXPORT_SYMBOL(p9_idpool_destroy
);
81 * p9_idpool_get - allocate numeric id from pool
82 * @p: pool to allocate from
84 * Bugs: This seems to be an awful generic function, should it be in idr.c with
85 * the lock included in struct idr?
88 int p9_idpool_get(struct p9_idpool
*p
)
95 if (idr_pre_get(&p
->pool
, GFP_NOFS
) == 0)
98 spin_lock_irqsave(&p
->lock
, flags
);
100 /* no need to store exactly p, we just need something non-null */
101 error
= idr_get_new(&p
->pool
, p
, &i
);
102 spin_unlock_irqrestore(&p
->lock
, flags
);
104 if (error
== -EAGAIN
)
109 P9_DPRINTK(P9_DEBUG_MUX
, " id %d pool %p\n", i
, p
);
112 EXPORT_SYMBOL(p9_idpool_get
);
115 * p9_idpool_put - release numeric id from pool
116 * @id: numeric id which is being released
117 * @p: pool to release id into
119 * Bugs: This seems to be an awful generic function, should it be in idr.c with
120 * the lock included in struct idr?
123 void p9_idpool_put(int id
, struct p9_idpool
*p
)
127 P9_DPRINTK(P9_DEBUG_MUX
, " id %d pool %p\n", id
, p
);
129 spin_lock_irqsave(&p
->lock
, flags
);
130 idr_remove(&p
->pool
, id
);
131 spin_unlock_irqrestore(&p
->lock
, flags
);
133 EXPORT_SYMBOL(p9_idpool_put
);
136 * p9_idpool_check - check if the specified id is available
141 int p9_idpool_check(int id
, struct p9_idpool
*p
)
143 return idr_find(&p
->pool
, id
) != NULL
;
145 EXPORT_SYMBOL(p9_idpool_check
);