svn commit: r213221 - head/sys/fs/devfs
Jaakko Heinonen
jh at FreeBSD.org
Mon Sep 27 18:20:56 UTC 2010
Author: jh
Date: Mon Sep 27 18:20:56 2010
New Revision: 213221
URL: http://svn.freebsd.org/changeset/base/213221
Log:
Add a new function devfs_dev_exists() to be able to find out if a
specific devfs path already exists.
The function will be used from kern_conf.c to detect duplicate device
registrations. Callers must hold the devmtx mutex.
Reviewed by: kib
Modified:
head/sys/fs/devfs/devfs_devs.c
head/sys/fs/devfs/devfs_int.h
Modified: head/sys/fs/devfs/devfs_devs.c
==============================================================================
--- head/sys/fs/devfs/devfs_devs.c Mon Sep 27 18:20:04 2010 (r213220)
+++ head/sys/fs/devfs/devfs_devs.c Mon Sep 27 18:20:56 2010 (r213221)
@@ -142,6 +142,27 @@ devfs_alloc(int flags)
return (cdev);
}
+int
+devfs_dev_exists(const char *name)
+{
+ struct cdev_priv *cdp;
+
+ mtx_assert(&devmtx, MA_OWNED);
+
+ TAILQ_FOREACH(cdp, &cdevp_list, cdp_list) {
+ if ((cdp->cdp_flags & CDP_ACTIVE) == 0)
+ continue;
+ if (devfs_pathpath(cdp->cdp_c.si_name, name) != 0)
+ return (1);
+ if (devfs_pathpath(name, cdp->cdp_c.si_name) != 0)
+ return (1);
+ }
+ if (devfs_dir_find(name) != 0)
+ return (1);
+
+ return (0);
+}
+
void
devfs_free(struct cdev *cdev)
{
Modified: head/sys/fs/devfs/devfs_int.h
==============================================================================
--- head/sys/fs/devfs/devfs_int.h Mon Sep 27 18:20:04 2010 (r213220)
+++ head/sys/fs/devfs/devfs_int.h Mon Sep 27 18:20:56 2010 (r213221)
@@ -72,6 +72,7 @@ struct cdev_priv {
#define cdev2priv(c) member2struct(cdev_priv, cdp_c, c)
struct cdev *devfs_alloc(int);
+int devfs_dev_exists(const char *);
void devfs_free(struct cdev *);
void devfs_create(struct cdev *dev);
void devfs_destroy(struct cdev *dev);
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