1 files changed, 86 insertions, 77 deletions

diff --git a/fs/proc/array.c b/fs/proc/array.c
index b380313092bd..07d6c4853fe8 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -77,6 +77,7 @@
 #include <linux/cpuset.h>
 #include <linux/rcupdate.h>
 #include <linux/delayacct.h>
+#include <linux/seq_file.h>
 #include <linux/pid_namespace.h>
 
 #include <asm/pgtable.h>
@@ -88,18 +89,21 @@
 do { memcpy(buffer, string, strlen(string)); \
      buffer += strlen(string); } while (0)
 
-static inline char *task_name(struct task_struct *p, char *buf)
+static inline void task_name(struct seq_file *m, struct task_struct *p)
 {
         int i;
+        char *buf, *end;
         char *name;
         char tcomm[sizeof(p->comm)];
 
         get_task_comm(tcomm, p);
 
-        ADDBUF(buf, "Name:\t");
+        seq_printf(m, "Name:\t");
+        end = m->buf + m->size;
+        buf = m->buf + m->count;
         name = tcomm;
         i = sizeof(tcomm);
-        do {
+        while (i && (buf < end)) {
                 unsigned char c = *name;
                 name++;
                 i--;
@@ -107,20 +111,21 @@ static inline char *task_name(struct task_struct *p, char *buf)
                 if (!c)
                         break;
                 if (c == '\\') {
-                        buf[1] = c;
-                        buf += 2;
+                        buf++;
+                        if (buf < end)
+                                *buf++ = c;
                         continue;
                 }
                 if (c == '\n') {
-                        buf[0] = '\\';
-                        buf[1] = 'n';
-                        buf += 2;
+                        *buf++ = '\\';
+                        if (buf < end)
+                                *buf++ = 'n';
                         continue;
                 }
                 buf++;
-        } while (i);
-        *buf = '\n';
-        return buf+1;
+        }
+        m->count = buf - m->buf;
+        seq_printf(m, "\n");
 }
 
 /*
@@ -151,21 +156,20 @@ static inline const char *get_task_state(struct task_struct *tsk)
         return *p;
 }
 
-static inline char *task_state(struct task_struct *p, char *buffer)
+static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
+                                struct pid *pid, struct task_struct *p)
 {
         struct group_info *group_info;
         int g;
         struct fdtable *fdt = NULL;
-        struct pid_namespace *ns;
         pid_t ppid, tpid;
 
-        ns = current->nsproxy->pid_ns;
         rcu_read_lock();
         ppid = pid_alive(p) ?
                 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
         tpid = pid_alive(p) && p->ptrace ?
                 task_pid_nr_ns(rcu_dereference(p->parent), ns) : 0;
-        buffer += sprintf(buffer,
+        seq_printf(m,
                 "State:\t%s\n"
                 "Tgid:\t%d\n"
                 "Pid:\t%d\n"
@@ -175,7 +179,7 @@ static inline char *task_state(struct task_struct *p, char *buffer)
                 "Gid:\t%d\t%d\t%d\t%d\n",
                 get_task_state(p),
                 task_tgid_nr_ns(p, ns),
-                task_pid_nr_ns(p, ns),
+                pid_nr_ns(pid, ns),
                 ppid, tpid,
                 p->uid, p->euid, p->suid, p->fsuid,
                 p->gid, p->egid, p->sgid, p->fsgid);
@@ -183,7 +187,7 @@ static inline char *task_state(struct task_struct *p, char *buffer)
         task_lock(p);
         if (p->files)
                 fdt = files_fdtable(p->files);
-        buffer += sprintf(buffer,
+        seq_printf(m,
                 "FDSize:\t%d\n"
                 "Groups:\t",
                 fdt ? fdt->max_fds : 0);
@@ -194,20 +198,18 @@ static inline char *task_state(struct task_struct *p, char *buffer)
         task_unlock(p);
 
         for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
-                buffer += sprintf(buffer, "%d ", GROUP_AT(group_info, g));
+                seq_printf(m, "%d ", GROUP_AT(group_info, g));
         put_group_info(group_info);
 
-        buffer += sprintf(buffer, "\n");
-        return buffer;
+        seq_printf(m, "\n");
 }
 
-static char *render_sigset_t(const char *header, sigset_t *set, char *buffer)
+static void render_sigset_t(struct seq_file *m, const char *header,
+                                sigset_t *set)
 {
-        int i, len;
+        int i;
 
-        len = strlen(header);
-        memcpy(buffer, header, len);
-        buffer += len;
+        seq_printf(m, "%s", header);
 
         i = _NSIG;
         do {
@@ -218,12 +220,10 @@ static char *render_sigset_t(const char *header, sigset_t *set, char *buffer)
                 if (sigismember(set, i+2)) x |= 2;
                 if (sigismember(set, i+3)) x |= 4;
                 if (sigismember(set, i+4)) x |= 8;
-                *buffer++ = (x < 10 ? '0' : 'a' - 10) + x;
+                seq_printf(m, "%x", x);
         } while (i >= 4);
 
-        *buffer++ = '\n';
-        *buffer = 0;
-        return buffer;
+        seq_printf(m, "\n");
 }
 
 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
@@ -241,7 +241,7 @@ static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
         }
 }
 
-static inline char *task_sig(struct task_struct *p, char *buffer)
+static inline void task_sig(struct seq_file *m, struct task_struct *p)
 {
         unsigned long flags;
         sigset_t pending, shpending, blocked, ignored, caught;
@@ -268,58 +268,66 @@ static inline char *task_sig(struct task_struct *p, char *buffer)
         }
         rcu_read_unlock();
 
-        buffer += sprintf(buffer, "Threads:\t%d\n", num_threads);
-        buffer += sprintf(buffer, "SigQ:\t%lu/%lu\n", qsize, qlim);
+        seq_printf(m, "Threads:\t%d\n", num_threads);
+        seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);
 
         /* render them all */
-        buffer = render_sigset_t("SigPnd:\t", &pending, buffer);
-        buffer = render_sigset_t("ShdPnd:\t", &shpending, buffer);
-        buffer = render_sigset_t("SigBlk:\t", &blocked, buffer);
-        buffer = render_sigset_t("SigIgn:\t", &ignored, buffer);
-        buffer = render_sigset_t("SigCgt:\t", &caught, buffer);
+        render_sigset_t(m, "SigPnd:\t", &pending);
+        render_sigset_t(m, "ShdPnd:\t", &shpending);
+        render_sigset_t(m, "SigBlk:\t", &blocked);
+        render_sigset_t(m, "SigIgn:\t", &ignored);
+        render_sigset_t(m, "SigCgt:\t", &caught);
+}
 
-        return buffer;
+static void render_cap_t(struct seq_file *m, const char *header,
+                        kernel_cap_t *a)
+{
+        unsigned __capi;
+
+        seq_printf(m, "%s", header);
+        CAP_FOR_EACH_U32(__capi) {
+                seq_printf(m, "%08x",
+                           a->cap[(_LINUX_CAPABILITY_U32S-1) - __capi]);
+        }
+        seq_printf(m, "\n");
 }
 
-static inline char *task_cap(struct task_struct *p, char *buffer)
+static inline void task_cap(struct seq_file *m, struct task_struct *p)
 {
-    return buffer + sprintf(buffer, "CapInh:\t%016x\n"
-                            "CapPrm:\t%016x\n"
-                            "CapEff:\t%016x\n",
-                            cap_t(p->cap_inheritable),
-                            cap_t(p->cap_permitted),
-                            cap_t(p->cap_effective));
+        render_cap_t(m, "CapInh:\t", &p->cap_inheritable);
+        render_cap_t(m, "CapPrm:\t", &p->cap_permitted);
+        render_cap_t(m, "CapEff:\t", &p->cap_effective);
 }
 
-static inline char *task_context_switch_counts(struct task_struct *p,
-                                                char *buffer)
+static inline void task_context_switch_counts(struct seq_file *m,
+                                                struct task_struct *p)
 {
-        return buffer + sprintf(buffer, "voluntary_ctxt_switches:\t%lu\n"
-                            "nonvoluntary_ctxt_switches:\t%lu\n",
-                            p->nvcsw,
-                            p->nivcsw);
+        seq_printf(m,   "voluntary_ctxt_switches:\t%lu\n"
+                        "nonvoluntary_ctxt_switches:\t%lu\n",
+                        p->nvcsw,
+                        p->nivcsw);
 }
 
-int proc_pid_status(struct task_struct *task, char *buffer)
+int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
+                        struct pid *pid, struct task_struct *task)
 {
-        char *orig = buffer;
         struct mm_struct *mm = get_task_mm(task);
 
-        buffer = task_name(task, buffer);
-        buffer = task_state(task, buffer);
+        task_name(m, task);
+        task_state(m, ns, pid, task);
 
         if (mm) {
-                buffer = task_mem(mm, buffer);
+                task_mem(m, mm);
                 mmput(mm);
         }
-        buffer = task_sig(task, buffer);
-        buffer = task_cap(task, buffer);
-        buffer = cpuset_task_status_allowed(task, buffer);
+        task_sig(m, task);
+        task_cap(m, task);
+        cpuset_task_status_allowed(m, task);
 #if defined(CONFIG_S390)
-        buffer = task_show_regs(task, buffer);
+        task_show_regs(m, task);
 #endif
-        buffer = task_context_switch_counts(task, buffer);
-        return buffer - orig;
+        task_context_switch_counts(m, task);
+        return 0;
 }
 
 /*
@@ -381,14 +389,14 @@ static cputime_t task_gtime(struct task_struct *p)
         return p->gtime;
 }
 
-static int do_task_stat(struct task_struct *task, char *buffer, int whole)
+static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
+                        struct pid *pid, struct task_struct *task, int whole)
 {
         unsigned long vsize, eip, esp, wchan = ~0UL;
         long priority, nice;
         int tty_pgrp = -1, tty_nr = 0;
         sigset_t sigign, sigcatch;
         char state;
-        int res;
         pid_t ppid = 0, pgid = -1, sid = -1;
         int num_threads = 0;
         struct mm_struct *mm;
@@ -400,9 +408,6 @@ static int do_task_stat(struct task_struct *task, char *buffer, int whole)
         unsigned long rsslim = 0;
         char tcomm[sizeof(task->comm)];
         unsigned long flags;
-        struct pid_namespace *ns;
-
-        ns = current->nsproxy->pid_ns;
 
         state = *get_task_state(task);
         vsize = eip = esp = 0;
@@ -489,10 +494,10 @@ static int do_task_stat(struct task_struct *task, char *buffer, int whole)
         /* convert nsec -> ticks */
         start_time = nsec_to_clock_t(start_time);
 
-        res = sprintf(buffer, "%d (%s) %c %d %d %d %d %d %u %lu \
+        seq_printf(m, "%d (%s) %c %d %d %d %d %d %u %lu \
 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n",
-                task_pid_nr_ns(task, ns),
+                pid_nr_ns(pid, ns),
                 tcomm,
                 state,
                 ppid,
@@ -541,20 +546,23 @@ static int do_task_stat(struct task_struct *task, char *buffer, int whole)
                 cputime_to_clock_t(cgtime));
         if (mm)
                 mmput(mm);
-        return res;
+        return 0;
 }
 
-int proc_tid_stat(struct task_struct *task, char *buffer)
+int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
+                        struct pid *pid, struct task_struct *task)
 {
-        return do_task_stat(task, buffer, 0);
+        return do_task_stat(m, ns, pid, task, 0);
 }
 
-int proc_tgid_stat(struct task_struct *task, char *buffer)
+int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
+                        struct pid *pid, struct task_struct *task)
 {
-        return do_task_stat(task, buffer, 1);
+        return do_task_stat(m, ns, pid, task, 1);
 }
 
-int proc_pid_statm(struct task_struct *task, char *buffer)
+int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
+                        struct pid *pid, struct task_struct *task)
 {
         int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
         struct mm_struct *mm = get_task_mm(task);
@@ -563,7 +571,8 @@ int proc_pid_statm(struct task_struct *task, char *buffer)
                 size = task_statm(mm, &shared, &text, &data, &resident);
                 mmput(mm);
         }
+        seq_printf(m, "%d %d %d %d %d %d %d\n",
+                        size, resident, shared, text, lib, data, 0);
 
-        return sprintf(buffer, "%d %d %d %d %d %d %d\n",
-                       size, resident, shared, text, lib, data, 0);
+        return 0;
 }