[PATCH] rename struct pspace to struct pid_namespace

Rename struct pspace to struct pid_namespace for consistency with other
namespaces (uts_namespace and ipc_namespace).  Also rename
include/linux/pspace.h to include/linux/pid_namespace.h and variables from
pspace to pid_ns.

Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Cc: Kirill Korotaev <dev@openvz.org>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index 9397ff6..89ccfa1 100644 (file)
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -45,7 +45,7 @@
 #include <linux/sysrq.h>
 #include <linux/vmalloc.h>
 #include <linux/crash_dump.h>
-#include <linux/pspace.h>
+#include <linux/pid_namespace.h>
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
 #include <asm/io.h>
@@ -92,7 +92,7 @@ static int loadavg_read_proc(char *page, char **start, off_t off,
                LOAD_INT(a), LOAD_FRAC(a),
                LOAD_INT(b), LOAD_FRAC(b),
                LOAD_INT(c), LOAD_FRAC(c),
-               nr_running(), nr_threads, init_pspace.last_pid);
+               nr_running(), nr_threads, init_pid_ns.last_pid);
        return proc_calc_metrics(page, start, off, count, eof, len);
 }
 

diff --git a/include/linux/pspace.h b/include/linux/pid_namespace.h
similarity index 69%
rename from include/linux/pspace.h
rename to include/linux/pid_namespace.h
index 91d48b8..54d7909 100644 (file)
--- a/include/linux/pspace.h
+++ b/include/linux/pid_namespace.h
@@ -1,5 +1,5 @@
-#ifndef _LINUX_PSPACE_H
-#define _LINUX_PSPACE_H
+#ifndef _LINUX_PID_NS_H
+#define _LINUX_PID_NS_H
 
 #include <linux/sched.h>
 #include <linux/mm.h>
@@ -13,11 +13,11 @@ struct pidmap {
 
 #define PIDMAP_ENTRIES         ((PID_MAX_LIMIT + 8*PAGE_SIZE - 1)/PAGE_SIZE/8)
 
-struct pspace {
+struct pid_namespace {
        struct pidmap pidmap[PIDMAP_ENTRIES];
        int last_pid;
 };
 
-extern struct pspace init_pspace;
+extern struct pid_namespace init_pid_ns;
 
-#endif /* _LINUX_PSPACE_H */
+#endif /* _LINUX_PID_NS_H */

diff --git a/kernel/pid.c b/kernel/pid.c
index a48879b..25807e1 100644 (file)
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -26,7 +26,7 @@
 #include <linux/init.h>
 #include <linux/bootmem.h>
 #include <linux/hash.h>
-#include <linux/pspace.h>
+#include <linux/pid_namespace.h>
 
 #define pid_hashfn(nr) hash_long((unsigned long)nr, pidhash_shift)
 static struct hlist_head *pid_hash;
@@ -43,9 +43,10 @@ int pid_max_max = PID_MAX_LIMIT;
 #define BITS_PER_PAGE          (PAGE_SIZE*8)
 #define BITS_PER_PAGE_MASK     (BITS_PER_PAGE-1)
 
-static inline int mk_pid(struct pspace *pspace, struct pidmap *map, int off)
+static inline int mk_pid(struct pid_namespace *pid_ns,
+               struct pidmap *map, int off)
 {
-       return (map - pspace->pidmap)*BITS_PER_PAGE + off;
+       return (map - pid_ns->pidmap)*BITS_PER_PAGE + off;
 }
 
 #define find_next_offset(map, off)                                     \
@@ -57,7 +58,7 @@ static inline int mk_pid(struct pspace *pspace, struct pidmap *map, int off)
  * value does not cause lots of bitmaps to be allocated, but
  * the scheme scales to up to 4 million PIDs, runtime.
  */
-struct pspace init_pspace = {
+struct pid_namespace init_pid_ns = {
        .pidmap = {
                [ 0 ... PIDMAP_ENTRIES-1] = { ATOMIC_INIT(BITS_PER_PAGE), NULL }
        },
@@ -80,25 +81,25 @@ struct pspace init_pspace = {
 
 static  __cacheline_aligned_in_smp DEFINE_SPINLOCK(pidmap_lock);
 
-static fastcall void free_pidmap(struct pspace *pspace, int pid)
+static fastcall void free_pidmap(struct pid_namespace *pid_ns, int pid)
 {
-       struct pidmap *map = pspace->pidmap + pid / BITS_PER_PAGE;
+       struct pidmap *map = pid_ns->pidmap + pid / BITS_PER_PAGE;
        int offset = pid & BITS_PER_PAGE_MASK;
 
        clear_bit(offset, map->page);
        atomic_inc(&map->nr_free);
 }
 
-static int alloc_pidmap(struct pspace *pspace)
+static int alloc_pidmap(struct pid_namespace *pid_ns)
 {
-       int i, offset, max_scan, pid, last = pspace->last_pid;
+       int i, offset, max_scan, pid, last = pid_ns->last_pid;
        struct pidmap *map;
 
        pid = last + 1;
        if (pid >= pid_max)
                pid = RESERVED_PIDS;
        offset = pid & BITS_PER_PAGE_MASK;
-       map = &pspace->pidmap[pid/BITS_PER_PAGE];
+       map = &pid_ns->pidmap[pid/BITS_PER_PAGE];
        max_scan = (pid_max + BITS_PER_PAGE - 1)/BITS_PER_PAGE - !offset;
        for (i = 0; i <= max_scan; ++i) {
                if (unlikely(!map->page)) {
@@ -120,11 +121,11 @@ static int alloc_pidmap(struct pspace *pspace)
                        do {
                                if (!test_and_set_bit(offset, map->page)) {
                                        atomic_dec(&map->nr_free);
-                                       pspace->last_pid = pid;
+                                       pid_ns->last_pid = pid;
                                        return pid;
                                }
                                offset = find_next_offset(map, offset);
-                               pid = mk_pid(pspace, map, offset);
+                               pid = mk_pid(pid_ns, map, offset);
                        /*
                         * find_next_offset() found a bit, the pid from it
                         * is in-bounds, and if we fell back to the last
@@ -135,34 +136,34 @@ static int alloc_pidmap(struct pspace *pspace)
                                        (i != max_scan || pid < last ||
                                            !((last+1) & BITS_PER_PAGE_MASK)));
                }
-               if (map < &pspace->pidmap[(pid_max-1)/BITS_PER_PAGE]) {
+               if (map < &pid_ns->pidmap[(pid_max-1)/BITS_PER_PAGE]) {
                        ++map;
                        offset = 0;
                } else {
-                       map = &pspace->pidmap[0];
+                       map = &pid_ns->pidmap[0];
                        offset = RESERVED_PIDS;
                        if (unlikely(last == offset))
                                break;
                }
-               pid = mk_pid(pspace, map, offset);
+               pid = mk_pid(pid_ns, map, offset);
        }
        return -1;
 }
 
-static int next_pidmap(struct pspace *pspace, int last)
+static int next_pidmap(struct pid_namespace *pid_ns, int last)
 {
        int offset;
        struct pidmap *map, *end;
 
        offset = (last + 1) & BITS_PER_PAGE_MASK;
-       map = &pspace->pidmap[(last + 1)/BITS_PER_PAGE];
-       end = &pspace->pidmap[PIDMAP_ENTRIES];
+       map = &pid_ns->pidmap[(last + 1)/BITS_PER_PAGE];
+       end = &pid_ns->pidmap[PIDMAP_ENTRIES];
        for (; map < end; map++, offset = 0) {
                if (unlikely(!map->page))
                        continue;
                offset = find_next_bit((map)->page, BITS_PER_PAGE, offset);
                if (offset < BITS_PER_PAGE)
-                       return mk_pid(pspace, map, offset);
+                       return mk_pid(pid_ns, map, offset);
        }
        return -1;
 }
@@ -192,7 +193,7 @@ fastcall void free_pid(struct pid *pid)
        hlist_del_rcu(&pid->pid_chain);
        spin_unlock_irqrestore(&pidmap_lock, flags);
 
-       free_pidmap(&init_pspace, pid->nr);
+       free_pidmap(&init_pid_ns, pid->nr);
        call_rcu(&pid->rcu, delayed_put_pid);
 }
 
@@ -206,7 +207,7 @@ struct pid *alloc_pid(void)
        if (!pid)
                goto out;
 
-       nr = alloc_pidmap(&init_pspace);
+       nr = alloc_pidmap(&init_pid_ns);
        if (nr < 0)
                goto out_free;
 
@@ -348,7 +349,7 @@ struct pid *find_ge_pid(int nr)
                pid = find_pid(nr);
                if (pid)
                        break;
-               nr = next_pidmap(&init_pspace, nr);
+               nr = next_pidmap(&init_pid_ns, nr);
        } while (nr > 0);
 
        return pid;
@@ -382,10 +383,10 @@ void __init pidhash_init(void)
 
 void __init pidmap_init(void)
 {
-       init_pspace.pidmap[0].page = kzalloc(PAGE_SIZE, GFP_KERNEL);
+       init_pid_ns.pidmap[0].page = kzalloc(PAGE_SIZE, GFP_KERNEL);
        /* Reserve PID 0. We never call free_pidmap(0) */
-       set_bit(0, init_pspace.pidmap[0].page);
-       atomic_dec(&init_pspace.pidmap[0].nr_free);
+       set_bit(0, init_pid_ns.pidmap[0].page);
+       atomic_dec(&init_pid_ns.pidmap[0].nr_free);
 
        pid_cachep = kmem_cache_create("pid", sizeof(struct pid),
                                        __alignof__(struct pid),