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o allocate io_hooks from a slab

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This commit is contained in:
Joe Thornber 2001-08-31 10:25:32 +00:00
parent 7567dd82cb
commit 78512ae004
1 changed files with 16 additions and 3 deletions
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19
driver/device-mapper/dm.c
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@ -48,6 +48,8 @@ struct io_hook {
void *context; void *context;
}; };
kmem_cache_t *_io_hook_cache;
#define rl down_read(&_dev_lock) #define rl down_read(&_dev_lock)
#define ru up_read(&_dev_lock) #define ru up_read(&_dev_lock)
#define wl down_write(&_dev_lock) #define wl down_write(&_dev_lock)
@ -83,6 +85,12 @@ static int init(void)
init_rwsem(&_dev_lock); init_rwsem(&_dev_lock);
if (!_io_hook_cache &&
!(_io_hook_cache =
kmem_cache_create("dm io hooks", sizeof(struct io_hook),
0, 0, NULL, NULL)))
return -ENOMEM;
if ((ret = dm_init_fs())) if ((ret = dm_init_fs()))
return ret; return ret;
@ -109,6 +117,9 @@ static int init(void)
static void fin(void) static void fin(void)
{ {
if(kmem_cache_shrink(_io_hook_cache))
WARN("it looks like there are still some io_hooks allocated");
dm_fin_fs(); dm_fin_fs();
if (devfs_unregister_blkdev(MAJOR_NR, _name) < 0) if (devfs_unregister_blkdev(MAJOR_NR, _name) < 0)
@ -219,17 +230,19 @@ static int blk_ioctl(struct inode *inode, struct file *file,
return 0; return 0;
} }
/* FIXME: These should have their own slab */
inline static struct io_hook *alloc_io_hook(void) inline static struct io_hook *alloc_io_hook(void)
{ {
return kmalloc(sizeof(struct io_hook), GFP_NOIO); return kmem_cache_alloc(_io_hook_cache, GFP_NOIO);
} }
inline static void free_io_hook(struct io_hook *ih) inline static void free_io_hook(struct io_hook *ih)
{ {
kfree(ih); kmem_cache_free(_io_hook_cache, ih);
} }
/* FIXME: need to decide if deferred_io's need their own slab, I say
no for now since they are only used when the device is
suspended. */
inline static struct deferred_io *alloc_deferred(void) inline static struct deferred_io *alloc_deferred(void)
{ {
return kmalloc(sizeof(struct deferred_io), GFP_NOIO); return kmalloc(sizeof(struct deferred_io), GFP_NOIO);