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d93435c3fb
linux/drivers/block
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Sergey Senozhatsky d93435c3fb zram: check comp algorithm availability earlier 
Improvement idea by Marcin Jabrzyk.

comp_algorithm_store() silently accepts any supplied algorithm name,
because zram performs algorithm availability check later, during the
device configuration phase in disksize_store() and emits the following
error:

  "zram: Cannot initialise %s compressing backend"

this error line is somewhat generic and, besides, can indicate a failed
attempt to allocate compression backend's working buffers.

add algorithm availability check to comp_algorithm_store():

  echo lzz > /sys/block/zram0/comp_algorithm
  -bash: echo: write error: Invalid argument

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Reported-by: Marcin Jabrzyk <m.jabrzyk@samsung.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-06-25 17:00:37 -07:00
..
aoe block: remove artifical max_hw_sectors cap 2014-10-21 14:02:54 -06:00
drbd net: Add a struct net parameter to sock_create_kern 2015-05-11 10:50:17 -04:00
mtip32xx blk-mq: add a 'list' parameter to ->queue_rq() 2014-10-29 11:14:52 -06:00
paride paride: fix the "verbose" module param 2015-04-15 16:35:22 -07:00
rsxx block/rsxx: use generic io stats accounting functions to simplify io stat accounting 2014-11-24 08:05:18 -07:00
xen-blkback xen/grant: introduce func gnttab_unmap_refs_sync() 2015-04-27 11:41:12 +01:00
zram zram: check comp algorithm availability earlier 2015-06-25 17:00:37 -07:00
amiflop.c block: drop owner assignment from platform_drivers 2014-10-20 16:20:18 +02:00
ataflop.c Merge branch 'for-3.16/core' of git://git.kernel.dk/linux-block into next 2014-06-02 09:29:34 -07:00
brd.c brd: rename XIP to DAX 2015-02-16 17:56:04 -08:00
cciss_cmd.h
cciss_scsi.c scsi: Do not set cmd_per_lun to 1 in the host template 2015-05-31 18:06:28 -07:00
cciss_scsi.h
cciss.c cciss: correct the non-resettable board list 2015-05-31 11:14:34 -07:00
cciss.h
cpqarray.c genirq: Remove the deprecated 'IRQF_DISABLED' request_irq() flag entirely 2015-03-05 20:53:06 +01:00
cpqarray.h
cryptoloop.c move linux/loop.h to drivers/block 2013-06-29 12:46:45 +04:00
DAC960.c block: use pci_zalloc_consistent 2014-08-08 15:57:28 -07:00
DAC960.h
floppy.c floppy: Avoid manual call of device_create_file() 2015-02-03 13:00:36 +01:00
hd.c block: hd: remove deprecated IRQF_DISABLED 2014-10-01 08:16:07 -06:00
ida_cmd.h
ida_ioctl.h
Kconfig block: pmem: Add dependency on HAS_IOMEM 2015-06-11 15:54:58 -06:00
loop.c block: destroy bdi before blockdev is unregistered. 2015-04-27 10:27:20 -06:00
loop.h loop: add blk-mq.h include 2015-01-02 15:20:25 -07:00
Makefile drivers/block/pmem: Add a driver for persistent memory 2015-04-01 17:03:56 +02:00
mg_disk.c block: drop owner assignment from platform_drivers 2014-10-20 16:20:18 +02:00
nbd.c nbd: Return error pointer directly 2015-04-02 12:39:28 -06:00
null_blk.c null_blk: suppress invalid partition info 2015-01-16 16:02:24 -07:00
nvme-core.c NVMe: fix type warning on 32-bit 2015-05-29 10:06:21 -06:00
nvme-scsi.c nvme: fix kernel memory corruption with short INQUIRY buffers 2015-05-13 10:22:12 -04:00
osdblk.c block: support different tag allocation policy 2015-01-23 14:15:46 -07:00
pktcdvd.c block,scsi: fixup blk_get_request dead queue scenarios 2014-08-28 10:03:46 -06:00
pmem.c drivers/block/pmem: Map NVDIMM in Write-Through mode 2015-06-07 15:29:01 +02:00
ps3disk.c block: Kill bio_segments()/bi_vcnt usage 2013-11-23 22:33:51 -08:00
ps3vram.c block: Convert bio_for_each_segment() to bvec_iter 2013-11-23 22:33:49 -08:00
rbd_types.h rbd: get rid of RBD_MAX_SEG_NAME_LEN 2012-12-17 08:37:29 -06:00
rbd.c rbd: end I/O the entire obj_request on error 2015-05-01 16:44:30 -07:00
skd_main.c block: disable entropy contributions for nonrot devices 2014-10-04 10:55:32 -06:00
skd_s1120.h skd: fix formatting in skd_s1120.h 2013-11-08 09:10:30 -07:00
smart1,2.h
sunvdc.c sunvdc: reconnect ldc after vds service domain restarts 2014-12-11 18:52:45 -08:00
swim3.c powerpc: Move Power Macintosh drivers to generic byteswappers 2015-03-23 14:29:40 +11:00
swim_asm.S
swim.c block: drop owner assignment from platform_drivers 2014-10-20 16:20:18 +02:00
sx8.c block,scsi: fixup blk_get_request dead queue scenarios 2014-08-28 10:03:46 -06:00
umem.c block: Convert drivers to immutable biovecs 2013-11-23 22:33:51 -08:00
umem.h
virtio_blk.c sd, mmc, virtio_blk, string_helpers: fix block size units 2015-04-10 16:27:48 -07:00
xen-blkfront.c xenbus_client: Extend interface to support multi-page ring 2015-04-15 10:56:47 +01:00
xsysace.c block: systemace: Remove .owner field for driver 2014-08-21 20:37:54 -05:00
z2ram.c block: remove struct request buffer member 2014-04-15 14:03:02 -06:00