proc: task_state: deuglify the max_fds calculation
1. The usage of fdt looks very ugly, it can't be NULL if ->files is
not NULL. We can use "unsigned int max_fds" instead.
2. This also allows to move seq_printf(max_fds) outside of task_lock()
and join it with the previous seq_printf(). See also the next patch.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Aaron Tomlin <atomlin@redhat.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
Cc: Sterling Alexander <stalexan@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Roland McGrath <roland@hack.frob.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/proc/array.c b/fs/proc/array.c
index b5810c2..7c8d9ae 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -157,9 +157,9 @@
struct user_namespace *user_ns = seq_user_ns(m);
struct group_info *group_info;
int g;
- struct fdtable *fdt = NULL;
const struct cred *cred;
pid_t ppid, tpid;
+ unsigned int max_fds = 0;
rcu_read_lock();
ppid = pid_alive(p) ?
@@ -171,6 +171,12 @@
tpid = task_pid_nr_ns(tracer, ns);
}
cred = get_task_cred(p);
+
+ task_lock(p);
+ if (p->files)
+ max_fds = files_fdtable(p->files)->max_fds;
+ task_unlock(p);
+
seq_printf(m,
"State:\t%s\n"
"Tgid:\t%d\n"
@@ -179,7 +185,8 @@
"PPid:\t%d\n"
"TracerPid:\t%d\n"
"Uid:\t%d\t%d\t%d\t%d\n"
- "Gid:\t%d\t%d\t%d\t%d\n",
+ "Gid:\t%d\t%d\t%d\t%d\n"
+ "FDSize:\t%d\nGroups:\t",
get_task_state(p),
task_tgid_nr_ns(p, ns),
task_numa_group_id(p),
@@ -192,16 +199,8 @@
from_kgid_munged(user_ns, cred->gid),
from_kgid_munged(user_ns, cred->egid),
from_kgid_munged(user_ns, cred->sgid),
- from_kgid_munged(user_ns, cred->fsgid));
-
- task_lock(p);
- if (p->files)
- fdt = files_fdtable(p->files);
- seq_printf(m,
- "FDSize:\t%d\n"
- "Groups:\t",
- fdt ? fdt->max_fds : 0);
- task_unlock(p);
+ from_kgid_munged(user_ns, cred->fsgid),
+ max_fds);
rcu_read_unlock();
group_info = cred->group_info;
