diff options
| -rw-r--r-- | Documentation/fault-injection/fault-injection.txt | 13 | ||||
| -rw-r--r-- | fs/proc/base.c | 14 |
2 files changed, 13 insertions, 14 deletions
diff --git a/Documentation/fault-injection/fault-injection.txt b/Documentation/fault-injection/fault-injection.txt index a32190508751..370ddcbc2b44 100644 --- a/Documentation/fault-injection/fault-injection.txt +++ b/Documentation/fault-injection/fault-injection.txt @@ -139,9 +139,9 @@ o proc entries - /proc/self/task/<current-tid>/fail-nth: Write to this file of integer N makes N-th call in the task fail. - Read from this file returns a single char 'Y' or 'N' - that says if the fault setup with a previous write to this file was - injected or not, and disables the fault if it wasn't yet injected. + Read from this file returns a integer value. A value of '0' indicates + that the fault setup with a previous write to this file was injected. + A positive integer N indicates that the fault wasn't yet injected. Note that this file enables all types of faults (slab, futex, etc). This setting takes precedence over all other generic debugfs settings like probability, interval, times, etc. But per-capability settings @@ -325,13 +325,14 @@ int main() write(fail_nth, buf, strlen(buf)); res = socketpair(AF_LOCAL, SOCK_STREAM, 0, fds); err = errno; - read(fail_nth, buf, 1); + pread(fail_nth, buf, sizeof(buf), 0); if (res == 0) { close(fds[0]); close(fds[1]); } - printf("%d-th fault %c: res=%d/%d\n", i, buf[0], res, err); - if (buf[0] != 'Y') + printf("%d-th fault %c: res=%d/%d\n", i, atoi(buf) ? 'N' : 'Y', + res, err); + if (atoi(buf)) break; } return 0; diff --git a/fs/proc/base.c b/fs/proc/base.c index c1fdaecb8d23..7d795d28dd02 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -1380,7 +1380,8 @@ static ssize_t proc_fail_nth_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { struct task_struct *task; - int err; + char numbuf[PROC_NUMBUF]; + ssize_t len; task = get_proc_task(file_inode(file)); if (!task) @@ -1388,13 +1389,10 @@ static ssize_t proc_fail_nth_read(struct file *file, char __user *buf, put_task_struct(task); if (task != current) return -EPERM; - if (count < 1) - return -EINVAL; - err = put_user((char)(current->fail_nth ? 'N' : 'Y'), buf); - if (err) - return err; - current->fail_nth = 0; - return 1; + len = snprintf(numbuf, sizeof(numbuf), "%u\n", task->fail_nth); + len = simple_read_from_buffer(buf, count, ppos, numbuf, len); + + return len; } static const struct file_operations proc_fail_nth_operations = { |