From 168c42bc56d8d47f67f2a5206506cd4ba3c18475 Mon Sep 17 00:00:00 2001 From: Akinobu Mita Date: Fri, 14 Jul 2017 14:50:00 -0700 Subject: [PATCH] fault-inject: add /proc//fail-nth fail-nth interface is only created in /proc/self/task//. This change also adds it in /proc//. This makes shell based tool a bit simpler. $ bash -c "builtin echo 100 > /proc/self/fail-nth && exec ls /" Link: http://lkml.kernel.org/r/1491490561-10485-6-git-send-email-akinobu.mita@gmail.com Signed-off-by: Akinobu Mita Cc: Dmitry Vyukov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Documentation/fault-injection/fault-injection.txt | 3 ++- fs/proc/base.c | 1 + 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/Documentation/fault-injection/fault-injection.txt b/Documentation/fault-injection/fault-injection.txt index 370ddcbc2b441..918972babcd8f 100644 --- a/Documentation/fault-injection/fault-injection.txt +++ b/Documentation/fault-injection/fault-injection.txt @@ -136,7 +136,8 @@ use the boot option: o proc entries -- /proc/self/task//fail-nth: +- /proc//fail-nth: +- /proc/self/task//fail-nth: Write to this file of integer N makes N-th call in the task fail. Read from this file returns a integer value. A value of '0' indicates diff --git a/fs/proc/base.c b/fs/proc/base.c index 872a3f28bfe41..719c2e943ea10 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -2962,6 +2962,7 @@ static const struct pid_entry tgid_base_stuff[] = { #endif #ifdef CONFIG_FAULT_INJECTION REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), + REG("fail-nth", 0644, proc_fail_nth_operations), #endif #ifdef CONFIG_ELF_CORE REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), -- 2.39.5