proc: add tgid_iter.pid_ns member

next_tgid() accepts pid namespace as an argument, but it never changes
during readdir (which would be unthinkable thing to do anyway).

Move it inside iterator type and hide from direct usage.

Link: https://lore.kernel.org/20260422191745.435556-1-adobriyan@gmail.com
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/fs/proc/base.c b/fs/proc/base.c
index d9acfa89c894bd1608580331e1d5b3018c59123b..f2db455dbbfd2f48e6a81150e3ea516053401675 100644 (file)
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -3543,8 +3543,10 @@ out:
 struct tgid_iter {
        unsigned int tgid;
        struct task_struct *task;
+       struct pid_namespace *pid_ns;
 };
-static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter)
+
+static struct tgid_iter next_tgid(struct tgid_iter iter)
 {
        struct pid *pid;
 
@@ -3553,9 +3555,9 @@ static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter ite
        rcu_read_lock();
 retry:
        iter.task = NULL;
-       pid = find_ge_pid(iter.tgid, ns);
+       pid = find_ge_pid(iter.tgid, iter.pid_ns);
        if (pid) {
-               iter.tgid = pid_nr_ns(pid, ns);
+               iter.tgid = pid_nr_ns(pid, iter.pid_ns);
                iter.task = pid_task(pid, PIDTYPE_TGID);
                if (!iter.task) {
                        iter.tgid += 1;
@@ -3574,7 +3576,7 @@ int proc_pid_readdir(struct file *file, struct dir_context *ctx)
 {
        struct tgid_iter iter;
        struct proc_fs_info *fs_info = proc_sb_info(file_inode(file)->i_sb);
-       struct pid_namespace *ns = proc_pid_ns(file_inode(file)->i_sb);
+       struct pid_namespace *pid_ns = proc_pid_ns(file_inode(file)->i_sb);
        loff_t pos = ctx->pos;
 
        if (pos >= PID_MAX_LIMIT + TGID_OFFSET)
@@ -3592,9 +3594,10 @@ int proc_pid_readdir(struct file *file, struct dir_context *ctx)
        }
        iter.tgid = pos - TGID_OFFSET;
        iter.task = NULL;
-       for (iter = next_tgid(ns, iter);
+       iter.pid_ns = pid_ns;
+       for (iter = next_tgid(iter);
             iter.task;
-            iter.tgid += 1, iter = next_tgid(ns, iter)) {
+            iter.tgid += 1, iter = next_tgid(iter)) {
                char name[10 + 1];
                unsigned int len;