fail-nth interface is only created in /proc/self/task/<current-tid>/. This change also adds it in /proc/<pid>/.
This makes shell based tool a bit simpler. $ bash -c "builtin echo 100 > /proc/self/fail-nth && exec ls /" Cc: Dmitry Vyukov <dvyu...@google.com> Signed-off-by: Akinobu Mita <akinobu.m...@gmail.com> --- 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 370ddcb..918972b 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/<current-tid>/fail-nth: +- /proc/<pid>/fail-nth: +- /proc/self/task/<tid>/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 14e7b73..ea1039d 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -2964,6 +2964,7 @@ 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), -- 2.7.4