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yaml
---
r: 83475
b: refs/heads/master
c: 13f14b4
h: refs/heads/master
i:
  83473: fdf43ec
  83471: c9cb9c3
v: v3
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Eric Dumazet authored and Linus Torvalds committed Feb 6, 2008
1 parent 0b9a0d9 commit 8896440
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Showing 2 changed files with 12 additions and 35 deletions.
2 changes: 1 addition & 1 deletion [refs]
Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: b41ecbebd4091a15233abab2d771e65fb82cdb20
refs/heads/master: 13f14b4d8be225cbb11ff2be7c048590a9ccf87b
45 changes: 11 additions & 34 deletions trunk/fs/namespace.c
Original file line number Diff line number Diff line change
Expand Up @@ -25,18 +25,21 @@
#include <linux/security.h>
#include <linux/mount.h>
#include <linux/ramfs.h>
#include <linux/log2.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
#include "pnode.h"
#include "internal.h"

#define HASH_SHIFT ilog2(PAGE_SIZE / sizeof(struct list_head))
#define HASH_SIZE (1UL << HASH_SHIFT)

/* spinlock for vfsmount related operations, inplace of dcache_lock */
__cacheline_aligned_in_smp DEFINE_SPINLOCK(vfsmount_lock);

static int event;

static struct list_head *mount_hashtable __read_mostly;
static int hash_mask __read_mostly, hash_bits __read_mostly;
static struct kmem_cache *mnt_cache __read_mostly;
static struct rw_semaphore namespace_sem;

Expand All @@ -48,8 +51,8 @@ static inline unsigned long hash(struct vfsmount *mnt, struct dentry *dentry)
{
unsigned long tmp = ((unsigned long)mnt / L1_CACHE_BYTES);
tmp += ((unsigned long)dentry / L1_CACHE_BYTES);
tmp = tmp + (tmp >> hash_bits);
return tmp & hash_mask;
tmp = tmp + (tmp >> HASH_SHIFT);
return tmp & (HASH_SIZE - 1);
}

struct vfsmount *alloc_vfsmnt(const char *name)
Expand Down Expand Up @@ -1813,9 +1816,7 @@ static void __init init_mount_tree(void)

void __init mnt_init(void)
{
struct list_head *d;
unsigned int nr_hash;
int i;
unsigned u;
int err;

init_rwsem(&namespace_sem);
Expand All @@ -1828,35 +1829,11 @@ void __init mnt_init(void)
if (!mount_hashtable)
panic("Failed to allocate mount hash table\n");

/*
* Find the power-of-two list-heads that can fit into the allocation..
* We don't guarantee that "sizeof(struct list_head)" is necessarily
* a power-of-two.
*/
nr_hash = PAGE_SIZE / sizeof(struct list_head);
hash_bits = 0;
do {
hash_bits++;
} while ((nr_hash >> hash_bits) != 0);
hash_bits--;
printk("Mount-cache hash table entries: %lu\n", HASH_SIZE);

for (u = 0; u < HASH_SIZE; u++)
INIT_LIST_HEAD(&mount_hashtable[u]);

/*
* Re-calculate the actual number of entries and the mask
* from the number of bits we can fit.
*/
nr_hash = 1UL << hash_bits;
hash_mask = nr_hash - 1;

printk("Mount-cache hash table entries: %d\n", nr_hash);

/* And initialize the newly allocated array */
d = mount_hashtable;
i = nr_hash;
do {
INIT_LIST_HEAD(d);
d++;
i--;
} while (i);
err = sysfs_init();
if (err)
printk(KERN_WARNING "%s: sysfs_init error: %d\n",
Expand Down

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