f057f6cdf6
This is the big patch that I've been working on for some time now. There are many reasons for wanting to make this change such as: o Reducing overhead by eliminating duplicated fields between structures o Simplifcation of the code (reduces the code size by a fair bit) o The locking interface is now the DLM interface itself as proposed some time ago. o Fewer lookups of glocks when processing replies from the DLM o Fewer memory allocations/deallocations for each glock o Scope to do further optimisations in the future (but this patch is more than big enough for now!) Please note that (a) this patch relates to the lock_dlm module and not the DLM itself, that is still a separate module; and (b) that we retain the ability to build GFS2 as a standalone single node filesystem with out requiring the DLM. This patch needs a lot of testing, hence my keeping it I restarted my -git tree after the last merge window. That way, this has the maximum exposure before its merged. This is (modulo a few minor bug fixes) the same patch that I've been posting on and off the the last three months and its passed a number of different tests so far. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
628 lines
16 KiB
C
628 lines
16 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 <asm/uaccess.h>
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#include <linux/gfs2_ondisk.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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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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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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NULL,
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};
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/*
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* lock_module. Originally from lock_dlm
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*/
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static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
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{
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const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
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return sprintf(buf, "%s\n", ops->lm_proto_name);
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}
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static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
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{
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struct lm_lockstruct *ls = &sdp->sd_lockstruct;
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ssize_t ret;
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int val = 0;
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if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags))
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val = 1;
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ret = sprintf(buf, "%d\n", val);
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return ret;
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}
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static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
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{
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struct lm_lockstruct *ls = &sdp->sd_lockstruct;
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ssize_t ret = len;
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int val;
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val = simple_strtol(buf, NULL, 0);
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if (val == 1)
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set_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
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else if (val == 0) {
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clear_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
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smp_mb__after_clear_bit();
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gfs2_glock_thaw(sdp);
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} else {
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ret = -EINVAL;
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}
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return ret;
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}
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static ssize_t lkid_show(struct gfs2_sbd *sdp, char *buf)
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{
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struct lm_lockstruct *ls = &sdp->sd_lockstruct;
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return sprintf(buf, "%u\n", ls->ls_id);
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}
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static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
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{
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struct lm_lockstruct *ls = &sdp->sd_lockstruct;
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return sprintf(buf, "%d\n", ls->ls_first);
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}
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static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
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{
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struct lm_lockstruct *ls = &sdp->sd_lockstruct;
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return sprintf(buf, "%d\n", ls->ls_first_done);
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}
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static ssize_t recover_show(struct gfs2_sbd *sdp, char *buf)
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{
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struct lm_lockstruct *ls = &sdp->sd_lockstruct;
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return sprintf(buf, "%d\n", ls->ls_recover_jid);
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}
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static void gfs2_jdesc_make_dirty(struct gfs2_sbd *sdp, unsigned int jid)
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{
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struct gfs2_jdesc *jd;
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spin_lock(&sdp->sd_jindex_spin);
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list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
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if (jd->jd_jid != jid)
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continue;
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jd->jd_dirty = 1;
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break;
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}
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spin_unlock(&sdp->sd_jindex_spin);
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}
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static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
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{
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struct lm_lockstruct *ls = &sdp->sd_lockstruct;
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ls->ls_recover_jid = simple_strtol(buf, NULL, 0);
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gfs2_jdesc_make_dirty(sdp, ls->ls_recover_jid);
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if (sdp->sd_recoverd_process)
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wake_up_process(sdp->sd_recoverd_process);
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return len;
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}
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static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
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{
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struct lm_lockstruct *ls = &sdp->sd_lockstruct;
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return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
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}
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static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
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{
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struct lm_lockstruct *ls = &sdp->sd_lockstruct;
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return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
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}
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struct gdlm_attr {
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struct attribute attr;
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ssize_t (*show)(struct gfs2_sbd *sdp, char *);
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ssize_t (*store)(struct gfs2_sbd *sdp, const char *, size_t);
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};
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#define GDLM_ATTR(_name,_mode,_show,_store) \
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static struct gdlm_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
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GDLM_ATTR(proto_name, 0444, proto_name_show, NULL);
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GDLM_ATTR(block, 0644, block_show, block_store);
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GDLM_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
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GDLM_ATTR(id, 0444, lkid_show, NULL);
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GDLM_ATTR(first, 0444, lkfirst_show, NULL);
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GDLM_ATTR(first_done, 0444, first_done_show, NULL);
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GDLM_ATTR(recover, 0644, recover_show, recover_store);
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GDLM_ATTR(recover_done, 0444, recover_done_show, NULL);
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GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
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static struct attribute *lock_module_attrs[] = {
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&gdlm_attr_proto_name.attr,
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&gdlm_attr_block.attr,
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&gdlm_attr_withdraw.attr,
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&gdlm_attr_id.attr,
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&lockstruct_attr_jid.attr,
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&gdlm_attr_first.attr,
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&gdlm_attr_first_done.attr,
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&gdlm_attr_recover.attr,
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&gdlm_attr_recover_done.attr,
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&gdlm_attr_recover_status.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(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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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_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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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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|
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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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|
return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \
|
|
} \
|
|
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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|
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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|
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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|
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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(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(quota_simul_sync, 1);
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|
TUNE_ATTR(stall_secs, 1);
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|
TUNE_ATTR(statfs_quantum, 1);
|
|
TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process);
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|
TUNE_ATTR_DAEMON(logd_secs, logd_process);
|
|
TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
|
|
|
|
static struct attribute *tune_attrs[] = {
|
|
&tune_attr_incore_log_blocks.attr,
|
|
&tune_attr_log_flush_secs.attr,
|
|
&tune_attr_quota_warn_period.attr,
|
|
&tune_attr_quota_quantum.attr,
|
|
&tune_attr_max_readahead.attr,
|
|
&tune_attr_complain_secs.attr,
|
|
&tune_attr_statfs_slow.attr,
|
|
&tune_attr_quota_simul_sync.attr,
|
|
&tune_attr_stall_secs.attr,
|
|
&tune_attr_statfs_quantum.attr,
|
|
&tune_attr_recoverd_secs.attr,
|
|
&tune_attr_logd_secs.attr,
|
|
&tune_attr_quota_scale.attr,
|
|
&tune_attr_new_files_jdata.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group lockstruct_group = {
|
|
.name = "lockstruct",
|
|
.attrs = lockstruct_attrs,
|
|
};
|
|
|
|
static struct attribute_group args_group = {
|
|
.name = "args",
|
|
.attrs = args_attrs,
|
|
};
|
|
|
|
static struct attribute_group tune_group = {
|
|
.name = "tune",
|
|
.attrs = tune_attrs,
|
|
};
|
|
|
|
static struct attribute_group lock_module_group = {
|
|
.name = "lock_module",
|
|
.attrs = lock_module_attrs,
|
|
};
|
|
|
|
int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
|
|
{
|
|
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, &args_group);
|
|
if (error)
|
|
goto fail_lockstruct;
|
|
|
|
error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
|
|
if (error)
|
|
goto fail_args;
|
|
|
|
error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
|
|
if (error)
|
|
goto fail_tune;
|
|
|
|
kobject_uevent(&sdp->sd_kobj, KOBJ_ADD);
|
|
return 0;
|
|
|
|
fail_tune:
|
|
sysfs_remove_group(&sdp->sd_kobj, &tune_group);
|
|
fail_args:
|
|
sysfs_remove_group(&sdp->sd_kobj, &args_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, &lockstruct_group);
|
|
sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
|
|
kobject_put(&sdp->sd_kobj);
|
|
}
|
|
|
|
static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
|
|
struct kobj_uevent_env *env)
|
|
{
|
|
struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
|
|
add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
|
|
add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
|
|
return 0;
|
|
}
|
|
|
|
static struct kset_uevent_ops gfs2_uevent_ops = {
|
|
.uevent = gfs2_uevent,
|
|
};
|
|
|
|
|
|
int gfs2_sys_init(void)
|
|
{
|
|
gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
|
|
if (!gfs2_kset)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
void gfs2_sys_uninit(void)
|
|
{
|
|
kset_unregister(gfs2_kset);
|
|
}
|
|
|