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[PATCH v2 2.6.38-rc8-tip 17/20] 17: uprobes: filter chain
- From: Srikar Dronamraju <srikar at linux dot vnet dot ibm dot com>
- To: Peter Zijlstra <peterz at infradead dot org>, Ingo Molnar <mingo at elte dot hu>
- Cc: Steven Rostedt <rostedt at goodmis dot org>, Srikar Dronamraju <srikar at linux dot vnet dot ibm dot com>, Linux-mm <linux-mm at kvack dot org>, Arnaldo Carvalho de Melo <acme at infradead dot org>, Linus Torvalds <torvalds at linux-foundation dot org>, Christoph Hellwig <hch at infradead dot org>, Masami Hiramatsu <masami dot hiramatsu dot pt at hitachi dot com>, Ananth N Mavinakayanahalli <ananth at in dot ibm dot com>, Oleg Nesterov <oleg at redhat dot com>, LKML <linux-kernel at vger dot kernel dot org>, SystemTap <systemtap at sources dot redhat dot com>, Jim Keniston <jkenisto at linux dot vnet dot ibm dot com>, Roland McGrath <roland at hack dot frob dot com>, Andi Kleen <andi at firstfloor dot org>, Andrew Morton <akpm at linux-foundation dot org>, "Paul E. McKenney" <paulmck at linux dot vnet dot ibm dot com>
- Date: Mon, 14 Mar 2011 19:07:22 +0530
- Subject: [PATCH v2 2.6.38-rc8-tip 17/20] 17: uprobes: filter chain
- References: <20110314133403.27435.7901.sendpatchset@localhost6.localdomain6>
Loops through the filters callbacks of currently registered
consumers to see if any consumer is interested in tracing this task.
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
---
kernel/uprobes.c | 18 ++++++++++++++++++
1 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/kernel/uprobes.c b/kernel/uprobes.c
index bbedcef..e3a3051 100644
--- a/kernel/uprobes.c
+++ b/kernel/uprobes.c
@@ -428,6 +428,24 @@ static void handler_chain(struct uprobe *uprobe, struct pt_regs *regs)
}
/* Acquires uprobe->consumer_rwsem */
+static bool filter_chain(struct uprobe *uprobe, struct task_struct *t)
+{
+ struct uprobe_consumer *consumer;
+ bool ret = false;
+
+ down_read(&uprobe->consumer_rwsem);
+ for (consumer = uprobe->consumers; consumer;
+ consumer = consumer->next) {
+ if (!consumer->filter || consumer->filter(consumer, t)) {
+ ret = true;
+ break;
+ }
+ }
+ up_read(&uprobe->consumer_rwsem);
+ return ret;
+}
+
+/* Acquires uprobe->consumer_rwsem */
static void add_consumer(struct uprobe *uprobe,
struct uprobe_consumer *consumer)
{