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https://github.com/followmsi/android_kernel_google_msm.git
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1bdad60633
There are several reasons why this is undesirable:
1. It never happens during normal operation anyway
2. If it does happen it causes performance to be very, very poor
3. It isn't likely to solve the original problem (memory shortage
on remote DLM node) it was supposed to solve
4. It uses a bunch of arbitrary constants which are unlikely to be
correct for any particular situation and for which the tuning seems
to be a black art.
5. In an N node cluster, only 1/N of the dropped locked will actually
contribute to solving the problem on average.
So all in all we are better off without it. This also makes merging
the lock_dlm module into GFS2 a bit easier.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
534 lines
14 KiB
C
534 lines
14 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/module.h>
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#include <linux/kobject.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/lm_interface.h>
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#include <asm/uaccess.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "sys.h"
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#include "super.h"
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#include "glock.h"
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#include "quota.h"
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#include "util.h"
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char *gfs2_sys_margs;
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spinlock_t gfs2_sys_margs_lock;
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static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%u:%u\n",
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MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
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}
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static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
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}
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static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
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{
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unsigned int count;
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mutex_lock(&sdp->sd_freeze_lock);
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count = sdp->sd_freeze_count;
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mutex_unlock(&sdp->sd_freeze_lock);
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return snprintf(buf, PAGE_SIZE, "%u\n", count);
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}
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static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
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{
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ssize_t ret = len;
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int error = 0;
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int n = simple_strtol(buf, NULL, 0);
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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switch (n) {
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case 0:
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gfs2_unfreeze_fs(sdp);
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break;
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case 1:
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error = gfs2_freeze_fs(sdp);
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break;
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default:
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ret = -EINVAL;
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}
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if (error)
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fs_warn(sdp, "freeze %d error %d", n, error);
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return ret;
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}
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static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
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{
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unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
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return snprintf(buf, PAGE_SIZE, "%u\n", b);
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}
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static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
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{
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (simple_strtol(buf, NULL, 0) != 1)
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return -EINVAL;
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gfs2_lm_withdraw(sdp,
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"GFS2: fsid=%s: withdrawing from cluster at user's request\n",
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sdp->sd_fsname);
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return len;
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}
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static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
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size_t len)
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{
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (simple_strtol(buf, NULL, 0) != 1)
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return -EINVAL;
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gfs2_statfs_sync(sdp);
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return len;
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}
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static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
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size_t len)
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{
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (simple_strtol(buf, NULL, 0) != 1)
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return -EINVAL;
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gfs2_quota_sync(sdp);
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return len;
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}
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static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
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size_t len)
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{
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u32 id;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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id = simple_strtoul(buf, NULL, 0);
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gfs2_quota_refresh(sdp, 1, id);
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return len;
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}
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static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
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size_t len)
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{
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u32 id;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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id = simple_strtoul(buf, NULL, 0);
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gfs2_quota_refresh(sdp, 0, id);
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return len;
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}
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struct gfs2_attr {
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struct attribute attr;
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ssize_t (*show)(struct gfs2_sbd *, char *);
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ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
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};
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#define GFS2_ATTR(name, mode, show, store) \
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static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
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GFS2_ATTR(id, 0444, id_show, NULL);
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GFS2_ATTR(fsname, 0444, fsname_show, NULL);
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GFS2_ATTR(freeze, 0644, freeze_show, freeze_store);
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GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
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GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store);
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GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store);
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GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store);
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GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store);
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static struct attribute *gfs2_attrs[] = {
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&gfs2_attr_id.attr,
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&gfs2_attr_fsname.attr,
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&gfs2_attr_freeze.attr,
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&gfs2_attr_withdraw.attr,
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&gfs2_attr_statfs_sync.attr,
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&gfs2_attr_quota_sync.attr,
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&gfs2_attr_quota_refresh_user.attr,
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&gfs2_attr_quota_refresh_group.attr,
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NULL,
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};
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static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
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char *buf)
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{
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struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
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struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
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return a->show ? a->show(sdp, buf) : 0;
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}
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static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
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const char *buf, size_t len)
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{
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struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
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struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
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return a->store ? a->store(sdp, buf, len) : len;
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}
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static struct sysfs_ops gfs2_attr_ops = {
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.show = gfs2_attr_show,
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.store = gfs2_attr_store,
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};
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static struct kobj_type gfs2_ktype = {
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.default_attrs = gfs2_attrs,
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.sysfs_ops = &gfs2_attr_ops,
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};
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static struct kset *gfs2_kset;
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/*
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* display struct lm_lockstruct fields
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*/
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struct lockstruct_attr {
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struct attribute attr;
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ssize_t (*show)(struct gfs2_sbd *, char *);
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};
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#define LOCKSTRUCT_ATTR(name, fmt) \
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static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
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{ \
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return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_lockstruct.ls_##name); \
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} \
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static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name)
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LOCKSTRUCT_ATTR(jid, "%u\n");
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LOCKSTRUCT_ATTR(first, "%u\n");
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LOCKSTRUCT_ATTR(lvb_size, "%u\n");
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LOCKSTRUCT_ATTR(flags, "%d\n");
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static struct attribute *lockstruct_attrs[] = {
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&lockstruct_attr_jid.attr,
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&lockstruct_attr_first.attr,
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&lockstruct_attr_lvb_size.attr,
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&lockstruct_attr_flags.attr,
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NULL,
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};
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/*
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* display struct gfs2_args fields
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*/
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struct args_attr {
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struct attribute attr;
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ssize_t (*show)(struct gfs2_sbd *, char *);
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};
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#define ARGS_ATTR(name, fmt) \
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static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
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{ \
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return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_args.ar_##name); \
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} \
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static struct args_attr args_attr_##name = __ATTR_RO(name)
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ARGS_ATTR(lockproto, "%s\n");
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ARGS_ATTR(locktable, "%s\n");
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ARGS_ATTR(hostdata, "%s\n");
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ARGS_ATTR(spectator, "%d\n");
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ARGS_ATTR(ignore_local_fs, "%d\n");
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ARGS_ATTR(localcaching, "%d\n");
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ARGS_ATTR(localflocks, "%d\n");
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ARGS_ATTR(debug, "%d\n");
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ARGS_ATTR(upgrade, "%d\n");
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ARGS_ATTR(num_glockd, "%u\n");
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ARGS_ATTR(posix_acl, "%d\n");
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ARGS_ATTR(quota, "%u\n");
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ARGS_ATTR(suiddir, "%d\n");
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ARGS_ATTR(data, "%d\n");
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/* one oddball doesn't fit the macro mold */
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static ssize_t noatime_show(struct gfs2_sbd *sdp, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n",
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!!test_bit(SDF_NOATIME, &sdp->sd_flags));
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}
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static struct args_attr args_attr_noatime = __ATTR_RO(noatime);
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static struct attribute *args_attrs[] = {
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&args_attr_lockproto.attr,
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&args_attr_locktable.attr,
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&args_attr_hostdata.attr,
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&args_attr_spectator.attr,
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&args_attr_ignore_local_fs.attr,
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&args_attr_localcaching.attr,
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&args_attr_localflocks.attr,
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&args_attr_debug.attr,
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&args_attr_upgrade.attr,
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&args_attr_num_glockd.attr,
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&args_attr_posix_acl.attr,
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&args_attr_quota.attr,
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&args_attr_suiddir.attr,
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&args_attr_data.attr,
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&args_attr_noatime.attr,
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NULL,
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};
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/*
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* display counters from superblock
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*/
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struct counters_attr {
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struct attribute attr;
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ssize_t (*show)(struct gfs2_sbd *, char *);
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};
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#define COUNTERS_ATTR(name, fmt) \
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static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
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{ \
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return snprintf(buf, PAGE_SIZE, fmt, \
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(unsigned int)atomic_read(&sdp->sd_##name)); \
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} \
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static struct counters_attr counters_attr_##name = __ATTR_RO(name)
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COUNTERS_ATTR(reclaimed, "%u\n");
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static struct attribute *counters_attrs[] = {
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&counters_attr_reclaimed.attr,
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NULL,
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};
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/*
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* get and set struct gfs2_tune fields
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*/
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static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%u %u\n",
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sdp->sd_tune.gt_quota_scale_num,
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sdp->sd_tune.gt_quota_scale_den);
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}
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static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
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size_t len)
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{
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struct gfs2_tune *gt = &sdp->sd_tune;
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unsigned int x, y;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
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return -EINVAL;
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spin_lock(>->gt_spin);
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gt->gt_quota_scale_num = x;
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gt->gt_quota_scale_den = y;
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spin_unlock(>->gt_spin);
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return len;
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}
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static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
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int check_zero, const char *buf, size_t len)
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{
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struct gfs2_tune *gt = &sdp->sd_tune;
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unsigned int x;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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x = simple_strtoul(buf, NULL, 0);
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if (check_zero && !x)
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return -EINVAL;
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spin_lock(>->gt_spin);
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*field = x;
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spin_unlock(>->gt_spin);
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return len;
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}
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struct tune_attr {
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struct attribute attr;
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ssize_t (*show)(struct gfs2_sbd *, char *);
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ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
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};
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#define TUNE_ATTR_3(name, show, store) \
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static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store)
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#define TUNE_ATTR_2(name, store) \
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static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \
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{ \
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return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \
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} \
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TUNE_ATTR_3(name, name##_show, store)
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#define TUNE_ATTR(name, check_zero) \
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static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
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{ \
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return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \
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} \
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TUNE_ATTR_2(name, name##_store)
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#define TUNE_ATTR_DAEMON(name, process) \
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static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
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{ \
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ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len); \
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wake_up_process(sdp->sd_##process); \
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return r; \
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} \
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TUNE_ATTR_2(name, name##_store)
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TUNE_ATTR(demote_secs, 0);
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TUNE_ATTR(incore_log_blocks, 0);
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TUNE_ATTR(log_flush_secs, 0);
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TUNE_ATTR(quota_warn_period, 0);
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TUNE_ATTR(quota_quantum, 0);
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TUNE_ATTR(atime_quantum, 0);
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TUNE_ATTR(max_readahead, 0);
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TUNE_ATTR(complain_secs, 0);
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TUNE_ATTR(statfs_slow, 0);
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TUNE_ATTR(new_files_jdata, 0);
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TUNE_ATTR(new_files_directio, 0);
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TUNE_ATTR(quota_simul_sync, 1);
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TUNE_ATTR(quota_cache_secs, 1);
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TUNE_ATTR(stall_secs, 1);
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TUNE_ATTR(statfs_quantum, 1);
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TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process);
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TUNE_ATTR_DAEMON(logd_secs, logd_process);
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TUNE_ATTR_DAEMON(quotad_secs, quotad_process);
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TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
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static struct attribute *tune_attrs[] = {
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&tune_attr_demote_secs.attr,
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&tune_attr_incore_log_blocks.attr,
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&tune_attr_log_flush_secs.attr,
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&tune_attr_quota_warn_period.attr,
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&tune_attr_quota_quantum.attr,
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&tune_attr_atime_quantum.attr,
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&tune_attr_max_readahead.attr,
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&tune_attr_complain_secs.attr,
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&tune_attr_statfs_slow.attr,
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&tune_attr_quota_simul_sync.attr,
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&tune_attr_quota_cache_secs.attr,
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&tune_attr_stall_secs.attr,
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&tune_attr_statfs_quantum.attr,
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&tune_attr_recoverd_secs.attr,
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&tune_attr_logd_secs.attr,
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&tune_attr_quotad_secs.attr,
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&tune_attr_quota_scale.attr,
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&tune_attr_new_files_jdata.attr,
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&tune_attr_new_files_directio.attr,
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NULL,
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};
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static struct attribute_group lockstruct_group = {
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.name = "lockstruct",
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.attrs = lockstruct_attrs,
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};
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static struct attribute_group counters_group = {
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.name = "counters",
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.attrs = counters_attrs,
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};
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static struct attribute_group args_group = {
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.name = "args",
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.attrs = args_attrs,
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};
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static struct attribute_group tune_group = {
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.name = "tune",
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.attrs = tune_attrs,
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};
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int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
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{
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|
int error;
|
|
|
|
sdp->sd_kobj.kset = gfs2_kset;
|
|
error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
|
|
"%s", sdp->sd_table_name);
|
|
if (error)
|
|
goto fail;
|
|
|
|
error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group);
|
|
if (error)
|
|
goto fail_reg;
|
|
|
|
error = sysfs_create_group(&sdp->sd_kobj, &counters_group);
|
|
if (error)
|
|
goto fail_lockstruct;
|
|
|
|
error = sysfs_create_group(&sdp->sd_kobj, &args_group);
|
|
if (error)
|
|
goto fail_counters;
|
|
|
|
error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
|
|
if (error)
|
|
goto fail_args;
|
|
|
|
kobject_uevent(&sdp->sd_kobj, KOBJ_ADD);
|
|
return 0;
|
|
|
|
fail_args:
|
|
sysfs_remove_group(&sdp->sd_kobj, &args_group);
|
|
fail_counters:
|
|
sysfs_remove_group(&sdp->sd_kobj, &counters_group);
|
|
fail_lockstruct:
|
|
sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
|
|
fail_reg:
|
|
kobject_put(&sdp->sd_kobj);
|
|
fail:
|
|
fs_err(sdp, "error %d adding sysfs files", error);
|
|
return error;
|
|
}
|
|
|
|
void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
|
|
{
|
|
sysfs_remove_group(&sdp->sd_kobj, &tune_group);
|
|
sysfs_remove_group(&sdp->sd_kobj, &args_group);
|
|
sysfs_remove_group(&sdp->sd_kobj, &counters_group);
|
|
sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
|
|
kobject_put(&sdp->sd_kobj);
|
|
}
|
|
|
|
int gfs2_sys_init(void)
|
|
{
|
|
gfs2_sys_margs = NULL;
|
|
spin_lock_init(&gfs2_sys_margs_lock);
|
|
gfs2_kset = kset_create_and_add("gfs2", NULL, fs_kobj);
|
|
if (!gfs2_kset)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
void gfs2_sys_uninit(void)
|
|
{
|
|
kfree(gfs2_sys_margs);
|
|
kset_unregister(gfs2_kset);
|
|
}
|
|
|