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[PATCH] rename struct pspace to struct pid_namespace

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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>
This commit is contained in:
Sukadev Bhattiprolu 2006-12-08 02:37:58 -08:00 committed by Linus Torvalds
parent 373beb35cd
commit 61a58c6c23
3 changed files with 32 additions and 31 deletions
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4
fs/proc/proc_misc.c
View file

@ -45,7 +45,7 @@
#include <linux/sysrq.h> #include <linux/sysrq.h>
#include <linux/vmalloc.h> #include <linux/vmalloc.h>
#include <linux/crash_dump.h> #include <linux/crash_dump.h>
#include <linux/pspace.h> #include <linux/pid_namespace.h>
#include <asm/uaccess.h> #include <asm/uaccess.h>
#include <asm/pgtable.h> #include <asm/pgtable.h>
#include <asm/io.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(a), LOAD_FRAC(a),
LOAD_INT(b), LOAD_FRAC(b), LOAD_INT(b), LOAD_FRAC(b),
LOAD_INT(c), LOAD_FRAC(c), 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); return proc_calc_metrics(page, start, off, count, eof, len);
} }

10
include/linux/pspace.h → include/linux/pid_namespace.h
View file

@ -1,5 +1,5 @@
#ifndef _LINUX_PSPACE_H #ifndef _LINUX_PID_NS_H
#define _LINUX_PSPACE_H #define _LINUX_PID_NS_H
#include <linux/sched.h> #include <linux/sched.h>
#include <linux/mm.h> #include <linux/mm.h>
@ -13,11 +13,11 @@ struct pidmap {
#define PIDMAP_ENTRIES ((PID_MAX_LIMIT + 8*PAGE_SIZE - 1)/PAGE_SIZE/8) #define PIDMAP_ENTRIES ((PID_MAX_LIMIT + 8*PAGE_SIZE - 1)/PAGE_SIZE/8)
struct pspace { struct pid_namespace {
struct pidmap pidmap[PIDMAP_ENTRIES]; struct pidmap pidmap[PIDMAP_ENTRIES];
int last_pid; int last_pid;
}; };
extern struct pspace init_pspace; extern struct pid_namespace init_pid_ns;
#endif /* _LINUX_PSPACE_H */ #endif /* _LINUX_PID_NS_H */

49
kernel/pid.c
View file

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