linux-kernel - [PATCH 0/8] introduce dynamic device creation/removal

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Date:	Thu, 26 Feb 2015 23:10:35 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan@...nel.org>
Cc:	Jerome Marchand <jmarchan@...hat.com>,
	Nitin Gupta <ngupta@...are.org>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: [PATCH 0/8] introduce dynamic device creation/removal

Hello,

this patchset introduces dynamic (on demand) zram device add-remove
functionality via /dev/zram-control interface. Two ioctl commands are
defined as of now (accessible in user-space via new zram.h header file):
-- ZRAM_CTL_ADD
	add new device (generates device_id automatically or uses provided
	device_id)
-- ZRAM_CTL_REMOVE
	remove device (by device_id)

util-linux zramctl update will be done later, after we land this patchset.


This also opens a possibility to drop some of sysfs device attrs and FOO_show()
code duplication in the future, and provide device stats/info via ioctl call
instead, providing something like (via zram.h):

	struct zram_info {
		__u64 orig_data_size;
		__u64 mem_used_total;
		__u64 max_comp_streams;

		[..]
	};


fill it under ->init_lock in zram_fill_info() (or any other name) function and
return all device stats at once back to user-space in a single syscall.

This is a long term plan, of course, but I'd like to see sysfs functions go away
in a year or so. What do you think?


Sergey Senozhatsky (8):
  zram: cosmetic ZRAM_ATTR_RO code formatting tweak
  zram: use idr instead of `zram_devices' array
  zram: factor out device reset from reset_store()
  zram: add dynamic device add/remove functionality
  zram: return zram device_id value from zram_add()
  zram: allow automatic new zram device_id assignment
  zram: remove max_num_devices limitation
  zram: report every added and removed device

 drivers/block/zram/zram_drv.c | 326 ++++++++++++++++++++++++++++--------------
 drivers/block/zram/zram_drv.h |   6 -
 include/linux/miscdevice.h    |   1 +
 include/uapi/linux/Kbuild     |   1 +
 include/uapi/linux/zram.h     |  17 +++
 5 files changed, 238 insertions(+), 113 deletions(-)
 create mode 100644 include/uapi/linux/zram.h

-- 
2.3.1.167.g7f4ba4b

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