Revision 033369d1af1264abc23bea2e174aa47cdd212f6f authored by Artem Bityutskiy on 01 June 2012, 14:18:08 UTC, committed by Al Viro on 01 June 2012, 14:37:36 UTC
This patch stops reiserfs using the VFS 'write_super()' method along with the s_dirt flag, because they are on their way out. The whole "superblock write-out" VFS infrastructure is served by the 'sync_supers()' kernel thread, which wakes up every 5 (by default) seconds and writes out all dirty superblock using the '->write_super()' call-back. But the problem with this thread is that it wastes power by waking up the system every 5 seconds, even if there are no diry superblocks, or there are no client file-systems which would need this (e.g., btrfs does not use '->write_super()'). So we want to kill it completely and thus, we need to make file-systems to stop using the '->write_super()' VFS service, and then remove it together with the kernel thread. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
1 parent 5c5fd81
ida_ioctl.h
/*
* Disk Array driver for Compaq SMART2 Controllers
* Copyright 1998 Compaq Computer Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Questions/Comments/Bugfixes to iss_storagedev@hp.com
*
*/
#ifndef IDA_IOCTL_H
#define IDA_IOCTL_H
#include "ida_cmd.h"
#include "cpqarray.h"
#define IDAGETDRVINFO 0x27272828
#define IDAPASSTHRU 0x28282929
#define IDAGETCTLRSIG 0x29293030
#define IDAREVALIDATEVOLS 0x30303131
#define IDADRIVERVERSION 0x31313232
#define IDAGETPCIINFO 0x32323333
typedef struct _ida_pci_info_struct
{
unsigned char bus;
unsigned char dev_fn;
__u32 board_id;
} ida_pci_info_struct;
/*
* Normally, the ioctl determines the logical unit for this command by
* the major,minor number of the fd passed to ioctl. If you need to send
* a command to a different/nonexistant unit (such as during config), you
* can override the normal behavior by setting the unit valid bit. (Normally,
* it should be zero) The controller the command is sent to is still
* determined by the major number of the open device.
*/
#define UNITVALID 0x80
typedef struct {
__u8 cmd;
__u8 rcode;
__u8 unit;
__u32 blk;
__u16 blk_cnt;
/* currently, sg_cnt is assumed to be 1: only the 0th element of sg is used */
struct {
void __user *addr;
size_t size;
} sg[SG_MAX];
int sg_cnt;
union ctlr_cmds {
drv_info_t drv;
unsigned char buf[1024];
id_ctlr_t id_ctlr;
drv_param_t drv_param;
id_log_drv_t id_log_drv;
id_log_drv_ext_t id_log_drv_ext;
sense_log_drv_stat_t sense_log_drv_stat;
id_phys_drv_t id_phys_drv;
blink_drv_leds_t blink_drv_leds;
sense_blink_leds_t sense_blink_leds;
config_t config;
reorder_log_drv_t reorder_log_drv;
label_log_drv_t label_log_drv;
surf_delay_t surf_delay;
overhead_delay_t overhead_delay;
mp_delay_t mp_delay;
scsi_param_t scsi_param;
} c;
} ida_ioctl_t;
#endif /* IDA_IOCTL_H */
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