f15ab5619d
This patch allows GFS2 to generate discard requests for blocks which are no longer useful to the filesystem (i.e. those which have been freed as the result of an unlink operation). The requests are generated at the time which those blocks become available for reuse in the filesystem. In order to use this new feature, you have to specify the "discard" mount option. The code coalesces adjacent blocks into a single extent when generating the discard requests, thus generating the minimum number. If an error occurs when the request has been sent to the block device, then it will print a message and turn off the requests for that filesystem. If the problem is temporary, then you can use remount to turn the option back on again. There is also a nodiscard mount option so that you can use remount to turn discard requests off, if required. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
179 lines
3.7 KiB
C
179 lines
3.7 KiB
C
/*
|
|
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
|
|
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
|
|
*
|
|
* This copyrighted material is made available to anyone wishing to use,
|
|
* modify, copy, or redistribute it subject to the terms and conditions
|
|
* of the GNU General Public License version 2.
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/gfs2_ondisk.h>
|
|
#include <linux/parser.h>
|
|
|
|
#include "gfs2.h"
|
|
#include "incore.h"
|
|
#include "super.h"
|
|
#include "sys.h"
|
|
#include "util.h"
|
|
|
|
enum {
|
|
Opt_lockproto,
|
|
Opt_locktable,
|
|
Opt_hostdata,
|
|
Opt_spectator,
|
|
Opt_ignore_local_fs,
|
|
Opt_localflocks,
|
|
Opt_localcaching,
|
|
Opt_debug,
|
|
Opt_nodebug,
|
|
Opt_upgrade,
|
|
Opt_acl,
|
|
Opt_noacl,
|
|
Opt_quota_off,
|
|
Opt_quota_account,
|
|
Opt_quota_on,
|
|
Opt_suiddir,
|
|
Opt_nosuiddir,
|
|
Opt_data_writeback,
|
|
Opt_data_ordered,
|
|
Opt_meta,
|
|
Opt_discard,
|
|
Opt_nodiscard,
|
|
Opt_err,
|
|
};
|
|
|
|
static const match_table_t tokens = {
|
|
{Opt_lockproto, "lockproto=%s"},
|
|
{Opt_locktable, "locktable=%s"},
|
|
{Opt_hostdata, "hostdata=%s"},
|
|
{Opt_spectator, "spectator"},
|
|
{Opt_ignore_local_fs, "ignore_local_fs"},
|
|
{Opt_localflocks, "localflocks"},
|
|
{Opt_localcaching, "localcaching"},
|
|
{Opt_debug, "debug"},
|
|
{Opt_nodebug, "nodebug"},
|
|
{Opt_upgrade, "upgrade"},
|
|
{Opt_acl, "acl"},
|
|
{Opt_noacl, "noacl"},
|
|
{Opt_quota_off, "quota=off"},
|
|
{Opt_quota_account, "quota=account"},
|
|
{Opt_quota_on, "quota=on"},
|
|
{Opt_suiddir, "suiddir"},
|
|
{Opt_nosuiddir, "nosuiddir"},
|
|
{Opt_data_writeback, "data=writeback"},
|
|
{Opt_data_ordered, "data=ordered"},
|
|
{Opt_meta, "meta"},
|
|
{Opt_discard, "discard"},
|
|
{Opt_nodiscard, "nodiscard"},
|
|
{Opt_err, NULL}
|
|
};
|
|
|
|
/**
|
|
* gfs2_mount_args - Parse mount options
|
|
* @sdp:
|
|
* @data:
|
|
*
|
|
* Return: errno
|
|
*/
|
|
|
|
int gfs2_mount_args(struct gfs2_sbd *sdp, struct gfs2_args *args, char *options)
|
|
{
|
|
char *o;
|
|
int token;
|
|
substring_t tmp[MAX_OPT_ARGS];
|
|
|
|
/* Split the options into tokens with the "," character and
|
|
process them */
|
|
|
|
while (1) {
|
|
o = strsep(&options, ",");
|
|
if (o == NULL)
|
|
break;
|
|
if (*o == '\0')
|
|
continue;
|
|
|
|
token = match_token(o, tokens, tmp);
|
|
switch (token) {
|
|
case Opt_lockproto:
|
|
match_strlcpy(args->ar_lockproto, &tmp[0],
|
|
GFS2_LOCKNAME_LEN);
|
|
break;
|
|
case Opt_locktable:
|
|
match_strlcpy(args->ar_locktable, &tmp[0],
|
|
GFS2_LOCKNAME_LEN);
|
|
break;
|
|
case Opt_hostdata:
|
|
match_strlcpy(args->ar_hostdata, &tmp[0],
|
|
GFS2_LOCKNAME_LEN);
|
|
break;
|
|
case Opt_spectator:
|
|
args->ar_spectator = 1;
|
|
break;
|
|
case Opt_ignore_local_fs:
|
|
args->ar_ignore_local_fs = 1;
|
|
break;
|
|
case Opt_localflocks:
|
|
args->ar_localflocks = 1;
|
|
break;
|
|
case Opt_localcaching:
|
|
args->ar_localcaching = 1;
|
|
break;
|
|
case Opt_debug:
|
|
args->ar_debug = 1;
|
|
break;
|
|
case Opt_nodebug:
|
|
args->ar_debug = 0;
|
|
break;
|
|
case Opt_upgrade:
|
|
args->ar_upgrade = 1;
|
|
break;
|
|
case Opt_acl:
|
|
args->ar_posix_acl = 1;
|
|
break;
|
|
case Opt_noacl:
|
|
args->ar_posix_acl = 0;
|
|
break;
|
|
case Opt_quota_off:
|
|
args->ar_quota = GFS2_QUOTA_OFF;
|
|
break;
|
|
case Opt_quota_account:
|
|
args->ar_quota = GFS2_QUOTA_ACCOUNT;
|
|
break;
|
|
case Opt_quota_on:
|
|
args->ar_quota = GFS2_QUOTA_ON;
|
|
break;
|
|
case Opt_suiddir:
|
|
args->ar_suiddir = 1;
|
|
break;
|
|
case Opt_nosuiddir:
|
|
args->ar_suiddir = 0;
|
|
break;
|
|
case Opt_data_writeback:
|
|
args->ar_data = GFS2_DATA_WRITEBACK;
|
|
break;
|
|
case Opt_data_ordered:
|
|
args->ar_data = GFS2_DATA_ORDERED;
|
|
break;
|
|
case Opt_meta:
|
|
args->ar_meta = 1;
|
|
break;
|
|
case Opt_discard:
|
|
args->ar_discard = 1;
|
|
break;
|
|
case Opt_nodiscard:
|
|
args->ar_discard = 0;
|
|
break;
|
|
case Opt_err:
|
|
default:
|
|
fs_info(sdp, "invalid mount option: %s\n", o);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|