Attachment 160362 Details for Bug 250336 – patch that implements this functionality.

[patch] patch that implements this functionality.

gfs-sysrq-glock-dump.patch (text/plain), 2.12 KB, created by Josef Bacik on 2007-07-31 21:27:38 UTC

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Creator: Josef Bacik

Created: 2007-07-31 21:27:38 UTC

Size: 2.12 KB

patch

obsolete

>--- gfs-kernel-2.6.9-72/src/gfs/proc.c.josef	2007-07-31 15:44:11.000000000 -0400
>+++ gfs-kernel-2.6.9-72/src/gfs/proc.c	2007-07-31 16:59:52.000000000 -0400
>@@ -21,6 +21,7 @@
> #include <linux/proc_fs.h>
> #include <linux/module.h>
> #include <asm/uaccess.h>
>+#include <linux/sysrq.h>
> 
> #include "gfs.h"
> #include "glock.h"
>@@ -342,6 +343,23 @@ do_lockdump(char *p, char *buf, size_t s
> 	return error;
> }
> 
>+static void dump_all_glocks()
>+{
>+	struct list_head *tmp;
>+	struct gfs_sbd *sdp;
>+
>+	down(&gfs_fs_lock);
>+
>+	for (tmp = gfs_fs_list.next; tmp != &gfs_fs_list; tmp = tmp->next) {
>+		sdp = list_entry(tmp, struct gfs_sbd, sd_list);
>+		printk(KERN_ERR "Dumping glocks for fsid=%s\n", 
>+				sdp->sd_fsname);
>+		gfs_dump_lockstate(sdp, NULL);
>+	}
>+
>+	up(&gfs_fs_lock);
>+}
>+
> /**
>  * gfs_proc_write - take a command from userspace
>  * @file:
>@@ -459,6 +477,22 @@ static struct file_operations gfs_proc_f
> };
> 
> /**
>+ * This is stuff for getting glock dumps through sysrq, very nasty stuff
>+ */
>+static void sysrq_handle_glock(int key, struct pt_regs *pt_regs,
>+				struct tty_struct *tty)
>+{
>+	dump_all_glocks();
>+}
>+
>+static struct sysrq_key_op sysrq_glock_op =
>+{
>+	.handler =	sysrq_handle_glock,
>+	.help_msg =	"Glock",
>+	.action_msg =	"Dumping glocks\n",
>+};
>+
>+/**
>  * gfs_proc_init - initialize GFS' proc interface
>  *
>  */
>@@ -474,6 +508,8 @@ gfs_proc_init(void)
> 	spin_lock_init(&gfs_proc_margs_lock);
> 	spin_lock_init(&req_lock);
> 
>+	__sysrq_put_key_op('g', &sysrq_glock_op);
>+
> 	pde = create_proc_entry("fs/gfs", S_IFREG | 0600, NULL);
> 	if (pde) {
> 		pde->owner = THIS_MODULE;
>--- gfs-kernel-2.6.9-72/src/gfs/glock.c.josef	2007-07-31 16:55:38.000000000 -0400
>+++ gfs-kernel-2.6.9-72/src/gfs/glock.c	2007-07-31 16:57:15.000000000 -0400
>@@ -19,6 +19,7 @@
> #include <linux/completion.h>
> #include <linux/buffer_head.h>
> #include <asm/uaccess.h>
>+#include <linux/nmi.h>
> 
> #include "gfs.h"
> #include "dio.h"
>@@ -2973,6 +2974,10 @@ gfs_dump_lockstate(struct gfs_sbd *sdp, 
> 				continue;
> 
> 			error = dump_glock(gl, buf, size, &count);
>+
>+			/* we are dumping to the console, tickle nmi */
>+			if (!ub)
>+				touch_nmi_watchdog();
> 			if (error)
> 				break;
> 		}

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Attachments on bug 250336: 160362