[PATCH 1/3] zram: drop `init_done' struct zram member

[Sergey Senozhatsky]

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.senozhat...@gmail.com>
---
 drivers/block/zram/zram_drv.c | 21 +++++++++++----------
 drivers/block/zram/zram_drv.h |  1 -
 2 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 011e55d..c323e05 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -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");
 }
 
@@ -613,7 +614,7 @@ static ssize_t disksize_store(struct device *dev,
        disksize = PAGE_ALIGN(disksize);
        meta = zram_meta_alloc(disksize);
        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");
@@ -734,7 +735,7 @@ 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)) {
@@ -857,7 +858,7 @@ 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:
diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h
index ad8aa35..e81e9cd 100644
--- a/drivers/block/zram/zram_drv.h
+++ b/drivers/block/zram/zram_drv.h
@@ -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;
        /*
-- 
1.8.5.2.487.g7559984

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