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authorSergey Senozhatsky <sergey.senozhatsky@gmail.com>2015-06-25 15:00:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-06-25 17:00:36 -0700
commit92ff15288747b80730f0132e9c98403370c27b34 (patch)
tree40ccefd330a9a7bef36cf8ff9cd14804ab4cb9f9 /drivers
parentb31177f2a9d5b2cfb1da7a06a4a98273b40975a8 (diff)
zram: return zram device_id from zram_add()
This patch prepares zram to enable on-demand device creation. zram_add() performs automatic device_id assignment and returns new device id (>= 0) or error code (< 0). Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Acked-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/block/zram/zram_drv.c23
1 files changed, 14 insertions, 9 deletions
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 4f76cf3e26a1..a52a8191bb91 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1153,20 +1153,24 @@ static struct attribute_group zram_disk_attr_group = {
.attrs = zram_disk_attrs,
};
-static int zram_add(int device_id)
+/*
+ * Allocate and initialize new zram device. the function returns
+ * '>= 0' device_id upon success, and negative value otherwise.
+ */
+static int zram_add(void)
{
struct zram *zram;
struct request_queue *queue;
- int ret;
+ int ret, device_id;
zram = kzalloc(sizeof(struct zram), GFP_KERNEL);
if (!zram)
return -ENOMEM;
- ret = idr_alloc(&zram_index_idr, zram, device_id,
- device_id + 1, GFP_KERNEL);
+ ret = idr_alloc(&zram_index_idr, zram, 0, 0, GFP_KERNEL);
if (ret < 0)
goto out_free_dev;
+ device_id = ret;
init_rwsem(&zram->init_lock);
@@ -1240,7 +1244,7 @@ static int zram_add(int device_id)
zram->max_comp_streams = 1;
pr_info("Added device: %s\n", zram->disk->disk_name);
- return 0;
+ return device_id;
out_free_disk:
del_gendisk(zram->disk);
@@ -1287,7 +1291,7 @@ static void destroy_devices(void)
static int __init zram_init(void)
{
- int ret, dev_id;
+ int ret;
zram_major = register_blkdev(0, "zram");
if (zram_major <= 0) {
@@ -1295,10 +1299,11 @@ static int __init zram_init(void)
return -EBUSY;
}
- for (dev_id = 0; dev_id < num_devices; dev_id++) {
- ret = zram_add(dev_id);
- if (ret != 0)
+ while (num_devices != 0) {
+ ret = zram_add();
+ if (ret < 0)
goto out_error;
+ num_devices--;
}
return 0;