diff options
author | Latchesar Ionkov <lucho@ionkov.net> | 2007-07-10 22:57:28 (GMT) |
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committer | Eric Van Hensbergen <ericvh@ericvh-desktop.austin.ibm.com> | 2007-07-14 20:13:40 (GMT) |
commit | bd238fb431f31989898423c8b6496bc8c4204a86 (patch) | |
tree | f85a536383cbf360125ecb0592f6c515e0ecf0ff /net/9p/util.c | |
parent | 8d9107e8c50e1c4ff43c91c8841805833f3ecfb9 (diff) | |
download | linux-bd238fb431f31989898423c8b6496bc8c4204a86.tar.xz |
9p: Reorganization of 9p file system code
This patchset moves non-filesystem interfaces of v9fs from fs/9p to net/9p.
It moves the transport, packet marshalling and connection layers to net/9p
leaving only the VFS related files in fs/9p. This work is being done in
preparation for in-kernel 9p servers as well as alternate 9p clients (other
than VFS).
Signed-off-by: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'net/9p/util.c')
-rw-r--r-- | net/9p/util.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/net/9p/util.c b/net/9p/util.c new file mode 100644 index 0000000..22077b7 --- /dev/null +++ b/net/9p/util.c @@ -0,0 +1,125 @@ +/* + * 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> +#include <net/9p/9p.h> + +struct p9_idpool { + struct semaphore lock; + struct idr pool; +}; + +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); + + init_MUTEX(&p->lock); + idr_init(&p->pool); + + return p; +} +EXPORT_SYMBOL(p9_idpool_create); + +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 + * @p - pool to allocate from + * + * XXX - This seems to be an awful generic function, should it be in idr.c with + * the lock included in struct idr? + */ + +int p9_idpool_get(struct p9_idpool *p) +{ + int i = 0; + int error; + +retry: + if (idr_pre_get(&p->pool, GFP_KERNEL) == 0) + return 0; + + if (down_interruptible(&p->lock) == -EINTR) { + P9_EPRINTK(KERN_WARNING, "Interrupted while locking\n"); + return -1; + } + + /* no need to store exactly p, we just need something non-null */ + error = idr_get_new(&p->pool, p, &i); + up(&p->lock); + + if (error == -EAGAIN) + goto retry; + else if (error) + return -1; + + return i; +} +EXPORT_SYMBOL(p9_idpool_get); + +/** + * p9_idpool_put - release numeric id from pool + * @p - pool to allocate from + * + * XXX - This seems to be an awful generic function, should it be in idr.c with + * the lock included in struct idr? + */ + +void p9_idpool_put(int id, struct p9_idpool *p) +{ + if (down_interruptible(&p->lock) == -EINTR) { + P9_EPRINTK(KERN_WARNING, "Interrupted while locking\n"); + return; + } + idr_remove(&p->pool, id); + up(&p->lock); +} +EXPORT_SYMBOL(p9_idpool_put); + +/** + * p9_idpool_check - check if the specified id is available + * @id - id to check + * @p - pool + */ +int p9_idpool_check(int id, struct p9_idpool *p) +{ + return idr_find(&p->pool, id) != NULL; +} +EXPORT_SYMBOL(p9_idpool_check); |