Messages in this thread Patch in this message | | | Date | Thu, 9 Jan 2014 15:57:46 +0300 | From | Sergey Senozhatsky <> | Subject | [PATCH -next] zram: drop `init_done' zram member |
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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>
---
drivers/block/zram/zram_drv.c | 21 +++++++++++---------- drivers/block/zram/zram_drv.h | 12 +++++------- 2 files changed, 16 insertions(+), 17 deletions(-)
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 108f273..833d24f 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); @@ -556,14 +561,12 @@ static void zram_reset_device(struct zram *zram, bool reset_capacity) flush_work(&zram->free_work); 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; @@ -604,8 +607,6 @@ 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"); } @@ -623,7 +624,7 @@ 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"); @@ -744,7 +745,7 @@ 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)) { @@ -893,7 +894,7 @@ 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 d8f6596..1388bad 100644 --- a/drivers/block/zram/zram_drv.h +++ b/drivers/block/zram/zram_drv.h @@ -99,26 +99,24 @@ struct zram_slot_free { }; struct zram { + /* Prevent concurrent execution of device init, reset and R/W request */ + struct rw_semaphore init_lock; struct zram_meta *meta; + 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 */ + spinlock_t slot_free_lock; + struct work_struct free_work; /* handle pending free request */ 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; /* * This is the limit on amount of *uncompressed* worth of data * we can store in a disk. */ u64 disksize; /* bytes */ - spinlock_t slot_free_lock; - struct zram_stats stats; }; #endif
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