Revision adae52b94e18afa1f84fab67df2a8a872c2f5533 authored by Miao Xie on 31 March 2011, 09:43:23 UTC, committed by Chris Mason on 05 April 2011, 05:19:43 UTC
the object id of the space cache inode's key is allocated from the relative root, just like the regular file. So we can't identify space cache inode by checking the object id of the inode's key, and we have to clear __GFP_FS flag at the time we look up the space cache inode. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
1 parent 6e8df2a
atomic64.c
/*
* Generic implementation of 64-bit atomics using spinlocks,
* useful on processors that don't have 64-bit atomic instructions.
*
* Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/types.h>
#include <linux/cache.h>
#include <linux/spinlock.h>
#include <linux/init.h>
#include <linux/module.h>
#include <asm/atomic.h>
/*
* We use a hashed array of spinlocks to provide exclusive access
* to each atomic64_t variable. Since this is expected to used on
* systems with small numbers of CPUs (<= 4 or so), we use a
* relatively small array of 16 spinlocks to avoid wasting too much
* memory on the spinlock array.
*/
#define NR_LOCKS 16
/*
* Ensure each lock is in a separate cacheline.
*/
static union {
spinlock_t lock;
char pad[L1_CACHE_BYTES];
} atomic64_lock[NR_LOCKS] __cacheline_aligned_in_smp;
static inline spinlock_t *lock_addr(const atomic64_t *v)
{
unsigned long addr = (unsigned long) v;
addr >>= L1_CACHE_SHIFT;
addr ^= (addr >> 8) ^ (addr >> 16);
return &atomic64_lock[addr & (NR_LOCKS - 1)].lock;
}
long long atomic64_read(const atomic64_t *v)
{
unsigned long flags;
spinlock_t *lock = lock_addr(v);
long long val;
spin_lock_irqsave(lock, flags);
val = v->counter;
spin_unlock_irqrestore(lock, flags);
return val;
}
EXPORT_SYMBOL(atomic64_read);
void atomic64_set(atomic64_t *v, long long i)
{
unsigned long flags;
spinlock_t *lock = lock_addr(v);
spin_lock_irqsave(lock, flags);
v->counter = i;
spin_unlock_irqrestore(lock, flags);
}
EXPORT_SYMBOL(atomic64_set);
void atomic64_add(long long a, atomic64_t *v)
{
unsigned long flags;
spinlock_t *lock = lock_addr(v);
spin_lock_irqsave(lock, flags);
v->counter += a;
spin_unlock_irqrestore(lock, flags);
}
EXPORT_SYMBOL(atomic64_add);
long long atomic64_add_return(long long a, atomic64_t *v)
{
unsigned long flags;
spinlock_t *lock = lock_addr(v);
long long val;
spin_lock_irqsave(lock, flags);
val = v->counter += a;
spin_unlock_irqrestore(lock, flags);
return val;
}
EXPORT_SYMBOL(atomic64_add_return);
void atomic64_sub(long long a, atomic64_t *v)
{
unsigned long flags;
spinlock_t *lock = lock_addr(v);
spin_lock_irqsave(lock, flags);
v->counter -= a;
spin_unlock_irqrestore(lock, flags);
}
EXPORT_SYMBOL(atomic64_sub);
long long atomic64_sub_return(long long a, atomic64_t *v)
{
unsigned long flags;
spinlock_t *lock = lock_addr(v);
long long val;
spin_lock_irqsave(lock, flags);
val = v->counter -= a;
spin_unlock_irqrestore(lock, flags);
return val;
}
EXPORT_SYMBOL(atomic64_sub_return);
long long atomic64_dec_if_positive(atomic64_t *v)
{
unsigned long flags;
spinlock_t *lock = lock_addr(v);
long long val;
spin_lock_irqsave(lock, flags);
val = v->counter - 1;
if (val >= 0)
v->counter = val;
spin_unlock_irqrestore(lock, flags);
return val;
}
EXPORT_SYMBOL(atomic64_dec_if_positive);
long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n)
{
unsigned long flags;
spinlock_t *lock = lock_addr(v);
long long val;
spin_lock_irqsave(lock, flags);
val = v->counter;
if (val == o)
v->counter = n;
spin_unlock_irqrestore(lock, flags);
return val;
}
EXPORT_SYMBOL(atomic64_cmpxchg);
long long atomic64_xchg(atomic64_t *v, long long new)
{
unsigned long flags;
spinlock_t *lock = lock_addr(v);
long long val;
spin_lock_irqsave(lock, flags);
val = v->counter;
v->counter = new;
spin_unlock_irqrestore(lock, flags);
return val;
}
EXPORT_SYMBOL(atomic64_xchg);
int atomic64_add_unless(atomic64_t *v, long long a, long long u)
{
unsigned long flags;
spinlock_t *lock = lock_addr(v);
int ret = 0;
spin_lock_irqsave(lock, flags);
if (v->counter != u) {
v->counter += a;
ret = 1;
}
spin_unlock_irqrestore(lock, flags);
return ret;
}
EXPORT_SYMBOL(atomic64_add_unless);
static int init_atomic64_lock(void)
{
int i;
for (i = 0; i < NR_LOCKS; ++i)
spin_lock_init(&atomic64_lock[i].lock);
return 0;
}
pure_initcall(init_atomic64_lock);
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