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Subject[PATCH 2/4] 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>
---
fs/proc/array.c | 23 +++++++++++------------
1 files changed, 11 insertions(+), 12 deletions(-)

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 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
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 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
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 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
"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 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
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;
--
1.5.5.1


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