The patch titled
Subject: zram: return zram device_id from zram_add()
has been added to the -mm tree. Its filename is
zram-return-zram-device_id-from-zram_add.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/zram-return-zram-device_id-from-zram_add.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/zram-return-zram-device_id-from-zram_add.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Subject: 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@xxxxxxxxx>
Acked-by: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Nitin Gupta <ngupta@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/block/zram/zram_drv.c | 23 ++++++++++++++---------
1 file changed, 14 insertions(+), 9 deletions(-)
diff -puN drivers/block/zram/zram_drv.c~zram-return-zram-device_id-from-zram_add drivers/block/zram/zram_drv.c
--- a/drivers/block/zram/zram_drv.c~zram-return-zram-device_id-from-zram_add
+++ a/drivers/block/zram/zram_drv.c
@@ -1151,20 +1151,24 @@ static struct attribute_group zram_disk_
.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);
@@ -1238,7 +1242,7 @@ 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);
@@ -1285,7 +1289,7 @@ 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) {
@@ -1293,10 +1297,11 @@ 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;
_
Patches currently in -mm which might be from sergey.senozhatsky@xxxxxxxxx are
revert-zram-move-compact_store-to-sysfs-functions-area.patch
zram-add-compact-sysfs-entry-to-documentation.patch
zram-cosmetic-zram_attr_ro-code-formatting-tweak.patch
zram-use-idr-instead-of-zram_devices-array.patch
zram-reorganize-code-layout.patch
zram-remove-max_num_devices-limitation.patch
zram-report-every-added-and-removed-device.patch
zram-trivial-correct-flag-operations-comment.patch
zram-return-zram-device_id-from-zram_add.patch
zram-close-race-by-open-overriding.patch
zram-add-dynamic-device-add-remove-functionality.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
