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zram: drop `init_done' struct zram member 

Introduce init_done() helper function which allows us to drop `init_done'
struct zram member.  init_done() uses the fact that ->init_done == 1
equals to ->meta != NULL.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Acked-by: Jerome Marchand <jmarchan@redhat.com>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sergey Senozhatsky 2014-04-07 15:38:00 -07:00 committed by Linus Torvalds
parent ed12d845b5
commit be2d1d56c8
2 changed files with 11 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/block/zram/zram_drv.c
View File

@ -42,6 +42,11 @@ static struct zram *zram_devices;
/* Module params (documentation at end) */
static unsigned int num_devices = 1;
static inline int init_done(struct zram *zram)
{
return zram->meta != NULL;
}
static inline struct zram *dev_to_zram(struct device *dev)
{
return (struct zram *)dev_to_disk(dev)->private_data;
@ -60,7 +65,7 @@ static ssize_t initstate_show(struct device *dev,
{
struct zram *zram = dev_to_zram(dev);
return sprintf(buf, "%u\n", zram->init_done);
return sprintf(buf, "%u\n", init_done(zram));
}
static ssize_t num_reads_show(struct device *dev,
@ -133,7 +138,7 @@ static ssize_t mem_used_total_show(struct device *dev,
struct zram_meta *meta = zram->meta;
down_read(&zram->init_lock);
if (zram->init_done)
if (init_done(zram))
val = zs_get_total_size_bytes(meta->mem_pool);
up_read(&zram->init_lock);
@ -546,14 +551,12 @@ static void zram_reset_device(struct zram *zram, bool reset_capacity)
struct zram_meta *meta;
down_write(&zram->init_lock);
if (!zram->init_done) {
if (!init_done(zram)) {
up_write(&zram->init_lock);
return;
}
meta = zram->meta;
zram->init_done = 0;
/* Free all pages that are still in this zram device */
for (index = 0; index < zram->disksize >> PAGE_SHIFT; index++) {
unsigned long handle = meta->table[index].handle;
@ -594,8 +597,6 @@ static void zram_init_device(struct zram *zram, struct zram_meta *meta)
queue_flag_set_unlocked(QUEUE_FLAG_NONROT, zram->disk->queue);
zram->meta = meta;
zram->init_done = 1;
pr_debug("Initialization done!\n");
}
@ -615,7 +616,7 @@ static ssize_t disksize_store(struct device *dev,
if (!meta)
return -ENOMEM;
down_write(&zram->init_lock);
if (zram->init_done) {
if (init_done(zram)) {
up_write(&zram->init_lock);
zram_meta_free(meta);
pr_info("Cannot change disksize for initialized device\n");
@ -736,7 +737,7 @@ static void zram_make_request(struct request_queue *queue, struct bio *bio)
struct zram *zram = queue->queuedata;
down_read(&zram->init_lock);
if (unlikely(!zram->init_done))
if (unlikely(!init_done(zram)))
goto error;
if (!valid_io_request(zram, bio)) {
@ -859,7 +860,7 @@ static int create_device(struct zram *zram, int device_id)
goto out_free_disk;
}
zram->init_done = 0;
zram->meta = NULL;
return 0;
out_free_disk:

1
drivers/block/zram/zram_drv.h
View File

@ -95,7 +95,6 @@ struct zram {
struct zram_meta *meta;
struct request_queue *queue;
struct gendisk *disk;
int init_done;
/* Prevent concurrent execution of device init, reset and R/W request */
struct rw_semaphore init_lock;
/*