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fault-inject: make fail-nth read/write interface symmetric

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The read interface for fail-nth looks a bit odd.  Read from this file
returns "NYYYY..." or "YYYYY..." (this makes me surprise when cat this
file).  Because there is no EOF condition.  The first character
indicates current->fail_nth is zero or not, and then current->fail_nth
is reset to zero.

Just returning task->fail_nth value is more natural to understand.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Akinobu Mita <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Akinobu Mita 2017-07-14 14:49:54 -07:00 • committed by Linus Torvalds
commit bfc740938d
2 changed files with 13 additions and 14 deletions
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14
fs/proc/base.c
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@ -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 = {