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Revert "zram: don't grab mutex in zram_slot_free_noity"

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This reverts commit 66db73c14b.
This commit is contained in:
Huang, Tao
2015-06-02 11:25:10 +08:00
parent d365bf6679
commit 668e3ed51f
2 changed files with 3 additions and 67 deletions
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60
drivers/staging/zram/zram_drv.c
View File

@@ -278,14 +278,6 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
goto out;
}
/*
* zram_slot_free_notify could miss free so that let's
* double check.
*/
if (unlikely(meta->table[index].handle ||
zram_test_flag(meta, index, ZRAM_ZERO)))
zram_free_page(zram, index);
ret = lzo1x_1_compress(uncmem, PAGE_SIZE, src, &clen,
meta->compress_workmem);
@@ -343,20 +335,6 @@ out:
return ret;
}
static void handle_pending_slot_free(struct zram *zram)
{
struct zram_slot_free *free_rq;
spin_lock(&zram->slot_free_lock);
while (zram->slot_free_rq) {
free_rq = zram->slot_free_rq;
zram->slot_free_rq = free_rq->next;
zram_free_page(zram, free_rq->index);
kfree(free_rq);
}
spin_unlock(&zram->slot_free_lock);
}
static int zram_bvec_rw(struct zram *zram, struct bio_vec *bvec, u32 index,
int offset, struct bio *bio, int rw)
{
@@ -364,12 +342,10 @@ static int zram_bvec_rw(struct zram *zram, struct bio_vec *bvec, u32 index,
if (rw == READ) {
down_read(&zram->lock);
handle_pending_slot_free(zram);
ret = zram_bvec_read(zram, bvec, index, offset, bio);
up_read(&zram->lock);
} else {
down_write(&zram->lock);
handle_pending_slot_free(zram);
ret = zram_bvec_write(zram, bvec, index, offset);
up_write(&zram->lock);
}
@@ -520,8 +496,6 @@ static void __zram_reset_device(struct zram *zram)
void zram_reset_device(struct zram *zram)
{
flush_work(&zram->free_work);
down_write(&zram->init_lock);
__zram_reset_device(zram);
up_write(&zram->init_lock);
@@ -607,40 +581,16 @@ void zram_init_device(struct zram *zram, struct zram_meta *meta)
pr_debug("Initialization done!\n");
}
static void zram_slot_free(struct work_struct *work)
{
struct zram *zram;
zram = container_of(work, struct zram, free_work);
down_write(&zram->lock);
handle_pending_slot_free(zram);
up_write(&zram->lock);
}
static void add_slot_free(struct zram *zram, struct zram_slot_free *free_rq)
{
spin_lock(&zram->slot_free_lock);
free_rq->next = zram->slot_free_rq;
zram->slot_free_rq = free_rq;
spin_unlock(&zram->slot_free_lock);
}
static void zram_slot_free_notify(struct block_device *bdev,
unsigned long index)
{
struct zram *zram;
struct zram_slot_free *free_rq;
zram = bdev->bd_disk->private_data;
down_write(&zram->lock);
zram_free_page(zram, index);
up_write(&zram->lock);
zram_stat64_inc(zram, &zram->stats.notify_free);
free_rq = kmalloc(sizeof(struct zram_slot_free), GFP_ATOMIC);
if (!free_rq)
return;
free_rq->index = index;
add_slot_free(zram, free_rq);
schedule_work(&zram->free_work);
}
static const struct block_device_operations zram_devops = {
@@ -656,10 +606,6 @@ static int create_device(struct zram *zram, int device_id)
init_rwsem(&zram->init_lock);
spin_lock_init(&zram->stat64_lock);
INIT_WORK(&zram->free_work, zram_slot_free);
spin_lock_init(&zram->slot_free_lock);
zram->slot_free_rq = NULL;
zram->queue = blk_alloc_queue(GFP_KERNEL);
if (!zram->queue) {
pr_err("Error allocating disk queue for device %d\n",

10
drivers/staging/zram/zram_drv.h
View File

@@ -90,21 +90,12 @@ struct zram_meta {
struct zs_pool *mem_pool;
};
struct zram_slot_free {
unsigned long index;
struct zram_slot_free *next;
};
struct zram {
struct zram_meta *meta;
spinlock_t stat64_lock; /* protect 64-bit stats */
struct rw_semaphore lock; /* protect compression buffers, table,
* 32bit stat counters against concurrent
* notifications, reads and writes */
struct work_struct free_work; /* handle pending free request */
struct zram_slot_free *slot_free_rq; /* list head of free request */
struct request_queue *queue;
struct gendisk *disk;
int init_done;
@@ -115,7 +106,6 @@ struct zram {
* we can store in a disk.
*/
u64 disksize; /* bytes */
spinlock_t slot_free_lock;
struct zram_stats stats;
};