diff options
| author | Song Liu | 2020-11-19 16:28:33 -0800 |
|---|---|---|
| committer | Daniel Borkmann | 2020-11-20 20:36:34 +0100 |
| commit | 91b2db27d3ff9ad29e8b3108dfbf1e2f49fe9bd3 (patch) | |
| tree | 7b69cd2cc416a9811f8fe9573b34c2b07250a6fe /kernel/bpf | |
| parent | 450d060e8f752a6ce052a2bffd3f01633472e330 (diff) | |
bpf: Simplify task_file_seq_get_next()
Simplify task_file_seq_get_next() by removing two in/out arguments: task
and fstruct. Use info->task and info->files instead.
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20201120002833.2481110-1-songliubraving@fb.com
Diffstat (limited to 'kernel/bpf')
| -rw-r--r-- | kernel/bpf/task_iter.c | 54 |
1 files changed, 17 insertions, 37 deletions
diff --git a/kernel/bpf/task_iter.c b/kernel/bpf/task_iter.c index 1fdb2fc196cd..0458a40edf10 100644 --- a/kernel/bpf/task_iter.c +++ b/kernel/bpf/task_iter.c @@ -136,8 +136,7 @@ struct bpf_iter_seq_task_file_info { }; static struct file * -task_file_seq_get_next(struct bpf_iter_seq_task_file_info *info, - struct task_struct **task, struct files_struct **fstruct) +task_file_seq_get_next(struct bpf_iter_seq_task_file_info *info) { struct pid_namespace *ns = info->common.ns; u32 curr_tid = info->tid, max_fds; @@ -150,14 +149,17 @@ task_file_seq_get_next(struct bpf_iter_seq_task_file_info *info, * Otherwise, it does not hold any reference. */ again: - if (*task) { - curr_task = *task; - curr_files = *fstruct; + if (info->task) { + curr_task = info->task; + curr_files = info->files; curr_fd = info->fd; } else { curr_task = task_seq_get_next(ns, &curr_tid, true); - if (!curr_task) + if (!curr_task) { + info->task = NULL; + info->files = NULL; return NULL; + } curr_files = get_files_struct(curr_task); if (!curr_files) { @@ -167,9 +169,8 @@ again: goto again; } - /* set *fstruct, *task and info->tid */ - *fstruct = curr_files; - *task = curr_task; + info->files = curr_files; + info->task = curr_task; if (curr_tid == info->tid) { curr_fd = info->fd; } else { @@ -199,8 +200,8 @@ again: rcu_read_unlock(); put_files_struct(curr_files); put_task_struct(curr_task); - *task = NULL; - *fstruct = NULL; + info->task = NULL; + info->files = NULL; info->fd = 0; curr_tid = ++(info->tid); goto again; @@ -209,21 +210,13 @@ again: static void *task_file_seq_start(struct seq_file *seq, loff_t *pos) { struct bpf_iter_seq_task_file_info *info = seq->private; - struct files_struct *files = NULL; - struct task_struct *task = NULL; struct file *file; - file = task_file_seq_get_next(info, &task, &files); - if (!file) { - info->files = NULL; - info->task = NULL; - return NULL; - } - - if (*pos == 0) + info->task = NULL; + info->files = NULL; + file = task_file_seq_get_next(info); + if (file && *pos == 0) ++*pos; - info->task = task; - info->files = files; return file; } @@ -231,24 +224,11 @@ static void *task_file_seq_start(struct seq_file *seq, loff_t *pos) static void *task_file_seq_next(struct seq_file *seq, void *v, loff_t *pos) { struct bpf_iter_seq_task_file_info *info = seq->private; - struct files_struct *files = info->files; - struct task_struct *task = info->task; - struct file *file; ++*pos; ++info->fd; fput((struct file *)v); - file = task_file_seq_get_next(info, &task, &files); - if (!file) { - info->files = NULL; - info->task = NULL; - return NULL; - } - - info->task = task; - info->files = files; - - return file; + return task_file_seq_get_next(info); } struct bpf_iter__task_file { |