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Message-ID: <20070904203053.GC19083@hmsreliant.think-freely.org>
Date: Tue, 4 Sep 2007 16:30:53 -0400
From: Neil Horman <nhorman@...driver.com>
To: rusty@...tcorp.com.au, adam@...drasil.com, jcm@...masters.org,
kaber@...sh.net, netfilter-devel@...ts.netfilter.org,
linux-kernel@...r.kernel.org
Cc: nhorman@...driver.com
Subject: [PATCH 2/2] Fix (improve) deadlock condition on module removal netfilter socket option removal
Hey-
2nd of two patches. This patch enhances modprobe to operate like rmmod
in non-blocking mode. It also adds a -w option to allow for explicit blocking
operation.
Regards
Neil
Signed-off-by: Neil Horman <nhorman@...driver.com>
modprobe.8 | 9 +++++++++
modprobe.c | 21 ++++++++++++++-------
2 files changed, 23 insertions(+), 7 deletions(-)
diff --git a/modprobe.8 b/modprobe.8
index 6910b5a..83f3229 100644
--- a/modprobe.8
+++ b/modprobe.8
@@ -109,6 +109,15 @@ sense to specify module parameters when removing modules).
There is usually no reason to remove modules, but some
buggy modules require it. Your kernel may not support
removal of modules.
+
+.TP
+\fB-w --wait \fR
+This option is applicable only with the -r or --remove option.
+It causes modprobe to block in the kernel waiting for the specified
+modules reference count to reach zero. Default operation is for
+modprobe to operate like rmmod, which exits with EWOULDBLOCK if the
+modules reference count is non-zero.
+
.TP
\fB-V --version \fR
Show version of program, and exit. See below for caveats when run on older kernels.
diff --git a/modprobe.c b/modprobe.c
index ea8de74..c9bd6af 100644
--- a/modprobe.c
+++ b/modprobe.c
@@ -913,7 +913,8 @@ static void rmmod(struct list_head *list,
struct module_command *commands,
int ignore_commands,
int ignore_inuse,
- const char *cmdline_opts)
+ const char *cmdline_opts,
+ int flags)
{
const char *command;
unsigned int usecount = 0;
@@ -967,7 +968,7 @@ static void rmmod(struct list_head *list,
/* Now do things we depend. */
if (!list_empty(list))
rmmod(list, NULL, 0, warn, dry_run, verbose, commands,
- 0, 1, cmdline_opts);
+ 0, 1, cmdline_opts, flags);
return;
nonexistent_module:
@@ -1333,7 +1334,8 @@ static void handle_module(const char *modname,
int strip_vermagic,
int strip_modversion,
int unknown_silent,
- const char *cmdline_opts)
+ const char *cmdline_opts,
+ int flags)
{
if (list_empty(todo_list)) {
const char *command;
@@ -1355,7 +1357,7 @@ static void handle_module(const char *modname,
if (remove)
rmmod(todo_list, newname, first_time, error, dry_run, verbose,
- commands, ignore_commands, 0, cmdline_opts);
+ commands, ignore_commands, 0, cmdline_opts, flags);
else
insmod(todo_list, NOFAIL(strdup(options)), newname,
first_time, error, dry_run, verbose, modoptions,
@@ -1368,6 +1370,7 @@ static struct option options[] = { { "verbose", 0, NULL, 'v' },
{ "config", 1, NULL, 'C' },
{ "name", 1, NULL, 'o' },
{ "remove", 0, NULL, 'r' },
+ { "wait", 0, NULL, 'w' },
{ "showconfig", 0, NULL, 'c' },
{ "autoclean", 0, NULL, 'k' },
{ "quiet", 0, NULL, 'q' },
@@ -1430,6 +1433,7 @@ int main(int argc, char *argv[])
char *newname = NULL;
char *aliasfilename, *symfilename;
errfn_t error = fatal;
+ int flags = O_NONBLOCK|O_EXCL;
/* Prepend options from environment. */
argv = merge_args(getenv("MODPROBE_OPTIONS"), argv, &argc);
@@ -1444,7 +1448,7 @@ int main(int argc, char *argv[])
try_old_version("modprobe", argv);
uname(&buf);
- while ((opt = getopt_long(argc, argv, "vVC:o:rknqQsclt:aifb", options, NULL)) != -1){
+ while ((opt = getopt_long(argc, argv, "vVC:o:rknqQsclt:aifbw", options, NULL)) != -1){
switch (opt) {
case 'v':
add_to_env_var("-v");
@@ -1529,6 +1533,9 @@ int main(int argc, char *argv[])
case 'b':
use_blacklist = 1;
break;
+ case 'w':
+ flags &= ~O_NONBLOCK;
+ break;
case 1:
strip_vermagic = 1;
break;
@@ -1651,7 +1658,7 @@ int main(int argc, char *argv[])
ignore_proc, strip_vermagic,
strip_modversion,
unknown_silent,
- optstring);
+ optstring, flags);
aliases = aliases->next;
INIT_LIST_HEAD(&list);
@@ -1666,7 +1673,7 @@ int main(int argc, char *argv[])
verbose, modoptions, commands,
ignore_commands, ignore_proc,
strip_vermagic, strip_modversion,
- unknown_silent, optstring);
+ unknown_silent, optstring, flags);
}
}
if (log)
--
/***************************************************
*Neil Horman
*Software Engineer
*Red Hat, Inc.
*nhorman@...driver.com
*gpg keyid: 1024D / 0x92A74FA1
*http://pgp.mit.edu
***************************************************/
-
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