diff options
Diffstat (limited to 'sys/dev/filemon/filemon.c')
| -rw-r--r-- | sys/dev/filemon/filemon.c | 27 |
1 files changed, 9 insertions, 18 deletions
diff --git a/sys/dev/filemon/filemon.c b/sys/dev/filemon/filemon.c index c711e3d29204..f8a698f65e3b 100644 --- a/sys/dev/filemon/filemon.c +++ b/sys/dev/filemon/filemon.c @@ -1,6 +1,7 @@ /*- * Copyright (c) 2011, David E. O'Brien. * Copyright (c) 2009-2011, Juniper Networks, Inc. + * Copyright (c) 2015, EMC Corp. * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -39,12 +40,14 @@ __FBSDID("$FreeBSD$"); #include <sys/fcntl.h> #include <sys/ioccom.h> #include <sys/kernel.h> +#include <sys/lock.h> #include <sys/malloc.h> #include <sys/module.h> #include <sys/mutex.h> #include <sys/poll.h> #include <sys/proc.h> #include <sys/queue.h> +#include <sys/sx.h> #include <sys/syscall.h> #include <sys/sysent.h> #include <sys/sysproto.h> @@ -85,12 +88,8 @@ MALLOC_DEFINE(M_FILEMON, "filemon", "File access monitor"); struct filemon { TAILQ_ENTRY(filemon) link; /* Link into the in-use list. */ - struct mtx mtx; /* Lock mutex for this filemon. */ - struct cv cv; /* Lock condition variable for this - filemon. */ + struct sx lock; /* Lock mutex for this filemon. */ struct file *fp; /* Output file pointer. */ - struct thread *locker; /* Ptr to the thread locking this - filemon. */ pid_t pid; /* The process ID being monitored. */ char fname1[MAXPATHLEN]; /* Temporary filename buffer. */ char fname2[MAXPATHLEN]; /* Temporary filename buffer. */ @@ -99,11 +98,7 @@ struct filemon { static TAILQ_HEAD(, filemon) filemons_inuse = TAILQ_HEAD_INITIALIZER(filemons_inuse); static TAILQ_HEAD(, filemon) filemons_free = TAILQ_HEAD_INITIALIZER(filemons_free); -static int n_readers = 0; -static struct mtx access_mtx; -static struct cv access_cv; -static struct thread *access_owner = NULL; -static struct thread *access_requester = NULL; +static struct sx access_lock; static struct cdev *filemon_dev; @@ -203,8 +198,7 @@ filemon_open(struct cdev *dev, int oflags __unused, int devtype __unused, filemon->fp = NULL; - mtx_init(&filemon->mtx, "filemon", "filemon", MTX_DEF); - cv_init(&filemon->cv, "filemon"); + sx_init(&filemon->lock, "filemon"); } filemon->pid = curproc->p_pid; @@ -234,8 +228,7 @@ filemon_close(struct cdev *dev __unused, int flag __unused, int fmt __unused, static void filemon_load(void *dummy __unused) { - mtx_init(&access_mtx, "filemon", "filemon", MTX_DEF); - cv_init(&access_cv, "filemon"); + sx_init(&access_lock, "filemons_inuse"); /* Install the syscall wrappers. */ filemon_wrapper_install(); @@ -270,14 +263,12 @@ filemon_unload(void) filemon_lock_write(); while ((filemon = TAILQ_FIRST(&filemons_free)) != NULL) { TAILQ_REMOVE(&filemons_free, filemon, link); - mtx_destroy(&filemon->mtx); - cv_destroy(&filemon->cv); + sx_destroy(&filemon->lock); free(filemon, M_FILEMON); } filemon_unlock_write(); - mtx_destroy(&access_mtx); - cv_destroy(&access_cv); + sx_destroy(&access_lock); } return (error); |