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root/fs/gfs2/sys.c

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DEFINITIONS

This source file includes following definitions.
  1. id_show
  2. fsname_show
  3. freeze_show
  4. freeze_store
  5. withdraw_show
  6. withdraw_store
  7. statfs_sync_store
  8. quota_sync_store
  9. quota_refresh_user_store
  10. quota_refresh_group_store
  11. gfs2_attr_show
  12. gfs2_attr_store
  13. quota_scale_show
  14. quota_scale_store
  15. tune_set
  16. gfs2_sys_fs_add
  17. gfs2_sys_fs_del
  18. gfs2_sys_init
  19. gfs2_sys_uninit

/*
 * 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/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/module.h>
#include <linux/kobject.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include <asm/uaccess.h>

#include "gfs2.h"
#include "incore.h"
#include "sys.h"
#include "super.h"
#include "glock.h"
#include "quota.h"
#include "util.h"

char *gfs2_sys_margs;
spinlock_t gfs2_sys_margs_lock;

static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
{
        return snprintf(buf, PAGE_SIZE, "%u:%u\n",
                        MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
}

static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
{
        return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
}

static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
{
        unsigned int count;

        mutex_lock(&sdp->sd_freeze_lock);
        count = sdp->sd_freeze_count;
        mutex_unlock(&sdp->sd_freeze_lock);

        return snprintf(buf, PAGE_SIZE, "%u\n", count);
}

static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
{
        ssize_t ret = len;
        int error = 0;
        int n = simple_strtol(buf, NULL, 0);

        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;

        switch (n) {
        case 0:
                gfs2_unfreeze_fs(sdp);
                break;
        case 1:
                error = gfs2_freeze_fs(sdp);
                break;
        default:
                ret = -EINVAL;
        }

        if (error)
                fs_warn(sdp, "freeze %d error %d", n, error);

        return ret;
}

static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
{
        unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
        return snprintf(buf, PAGE_SIZE, "%u\n", b);
}

static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
{
        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;

        if (simple_strtol(buf, NULL, 0) != 1)
                return -EINVAL;

        gfs2_lm_withdraw(sdp,
                "GFS2: fsid=%s: withdrawing from cluster at user's request\n",
                sdp->sd_fsname);
        return len;
}

static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
                                 size_t len)
{
        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;

        if (simple_strtol(buf, NULL, 0) != 1)
                return -EINVAL;

        gfs2_statfs_sync(sdp);
        return len;
}

static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
                                size_t len)
{
        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;

        if (simple_strtol(buf, NULL, 0) != 1)
                return -EINVAL;

        gfs2_quota_sync(sdp);
        return len;
}

static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
                                        size_t len)
{
        u32 id;

        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;

        id = simple_strtoul(buf, NULL, 0);

        gfs2_quota_refresh(sdp, 1, id);
        return len;
}

static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
                                         size_t len)
{
        u32 id;

        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;

        id = simple_strtoul(buf, NULL, 0);

        gfs2_quota_refresh(sdp, 0, id);
        return len;
}

struct gfs2_attr {
        struct attribute attr;
        ssize_t (*show)(struct gfs2_sbd *, char *);
        ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
};

#define GFS2_ATTR(name, mode, show, store) \
static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)

GFS2_ATTR(id,                  0444, id_show,       NULL);
GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);

static struct attribute *gfs2_attrs[] = {
        &gfs2_attr_id.attr,
        &gfs2_attr_fsname.attr,
        &gfs2_attr_freeze.attr,
        &gfs2_attr_withdraw.attr,
        &gfs2_attr_statfs_sync.attr,
        &gfs2_attr_quota_sync.attr,
        &gfs2_attr_quota_refresh_user.attr,
        &gfs2_attr_quota_refresh_group.attr,
        NULL,
};

static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
                              char *buf)
{
        struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
        struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
        return a->show ? a->show(sdp, buf) : 0;
}

static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
                               const char *buf, size_t len)
{
        struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
        struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
        return a->store ? a->store(sdp, buf, len) : len;
}

static struct sysfs_ops gfs2_attr_ops = {
        .show  = gfs2_attr_show,
        .store = gfs2_attr_store,
};

static struct kobj_type gfs2_ktype = {
        .default_attrs = gfs2_attrs,
        .sysfs_ops     = &gfs2_attr_ops,
};

static struct kset *gfs2_kset;

/*
 * display struct lm_lockstruct fields
 */

struct lockstruct_attr {
        struct attribute attr;
        ssize_t (*show)(struct gfs2_sbd *, char *);
};

#define LOCKSTRUCT_ATTR(name, fmt)                                          \
static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
{                                                                           \
        return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_lockstruct.ls_##name); \
}                                                                           \
static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name)

LOCKSTRUCT_ATTR(jid,      "%u\n");
LOCKSTRUCT_ATTR(first,    "%u\n");
LOCKSTRUCT_ATTR(lvb_size, "%u\n");
LOCKSTRUCT_ATTR(flags,    "%d\n");

static struct attribute *lockstruct_attrs[] = {
        &lockstruct_attr_jid.attr,
        &lockstruct_attr_first.attr,
        &lockstruct_attr_lvb_size.attr,
        &lockstruct_attr_flags.attr,
        NULL,
};

/*
 * display struct gfs2_args fields
 */

struct args_attr {
        struct attribute attr;
        ssize_t (*show)(struct gfs2_sbd *, char *);
};

#define ARGS_ATTR(name, fmt)                                                \
static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
{                                                                           \
        return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_args.ar_##name);       \
}                                                                           \
static struct args_attr args_attr_##name = __ATTR_RO(name)

ARGS_ATTR(lockproto,       "%s\n");
ARGS_ATTR(locktable,       "%s\n");
ARGS_ATTR(hostdata,        "%s\n");
ARGS_ATTR(spectator,       "%d\n");
ARGS_ATTR(ignore_local_fs, "%d\n");
ARGS_ATTR(localcaching,    "%d\n");
ARGS_ATTR(localflocks,     "%d\n");
ARGS_ATTR(debug,           "%d\n");
ARGS_ATTR(upgrade,         "%d\n");
ARGS_ATTR(num_glockd,      "%u\n");
ARGS_ATTR(posix_acl,       "%d\n");
ARGS_ATTR(quota,           "%u\n");
ARGS_ATTR(suiddir,         "%d\n");
ARGS_ATTR(data,            "%d\n");

static struct attribute *args_attrs[] = {
        &args_attr_lockproto.attr,
        &args_attr_locktable.attr,
        &args_attr_hostdata.attr,
        &args_attr_spectator.attr,
        &args_attr_ignore_local_fs.attr,
        &args_attr_localcaching.attr,
        &args_attr_localflocks.attr,
        &args_attr_debug.attr,
        &args_attr_upgrade.attr,
        &args_attr_num_glockd.attr,
        &args_attr_posix_acl.attr,
        &args_attr_quota.attr,
        &args_attr_suiddir.attr,
        &args_attr_data.attr,
        NULL,
};

/*
 * display counters from superblock
 */

struct counters_attr {
        struct attribute attr;
        ssize_t (*show)(struct gfs2_sbd *, char *);
};

#define COUNTERS_ATTR(name, fmt)                                            \
static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
{                                                                           \
        return snprintf(buf, PAGE_SIZE, fmt,                                \
                        (unsigned int)atomic_read(&sdp->sd_##name));        \
}                                                                           \
static struct counters_attr counters_attr_##name = __ATTR_RO(name)

COUNTERS_ATTR(reclaimed,        "%u\n");

static struct attribute *counters_attrs[] = {
        &counters_attr_reclaimed.attr,
        NULL,
};

/*
 * get and set struct gfs2_tune fields
 */

static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
{
        return snprintf(buf, PAGE_SIZE, "%u %u\n",
                        sdp->sd_tune.gt_quota_scale_num,
                        sdp->sd_tune.gt_quota_scale_den);
}

static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
                                 size_t len)
{
        struct gfs2_tune *gt = &sdp->sd_tune;
        unsigned int x, y;

        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;

        if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
                return -EINVAL;

        spin_lock(&gt->gt_spin);
        gt->gt_quota_scale_num = x;
        gt->gt_quota_scale_den = y;
        spin_unlock(&gt->gt_spin);
        return len;
}

static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
                        int check_zero, const char *buf, size_t len)
{
        struct gfs2_tune *gt = &sdp->sd_tune;
        unsigned int x;

        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;

        x = simple_strtoul(buf, NULL, 0);

        if (check_zero && !x)
                return -EINVAL;

        spin_lock(&gt->gt_spin);
        *field = x;
        spin_unlock(&gt->gt_spin);
        return len;
}

struct tune_attr {
        struct attribute attr;
        ssize_t (*show)(struct gfs2_sbd *, char *);
        ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
};

#define TUNE_ATTR_3(name, show, store)                                        \
static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store)

#define TUNE_ATTR_2(name, store)                                              \
static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
{                                                                             \
        return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
}                                                                             \
TUNE_ATTR_3(name, name##_show, store)

#define TUNE_ATTR(name, check_zero)                                           \
static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
{                                                                             \
        return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
}                                                                             \
TUNE_ATTR_2(name, name##_store)

#define TUNE_ATTR_DAEMON(name, process)                                       \
static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
{                                                                             \
        ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len);      \
        wake_up_process(sdp->sd_##process);                                   \
        return r;                                                             \
}                                                                             \
TUNE_ATTR_2(name, name##_store)

TUNE_ATTR(demote_secs, 0);
TUNE_ATTR(incore_log_blocks, 0);
TUNE_ATTR(log_flush_secs, 0);
TUNE_ATTR(quota_warn_period, 0);
TUNE_ATTR(quota_quantum, 0);
TUNE_ATTR(max_readahead, 0);
TUNE_ATTR(complain_secs, 0);
TUNE_ATTR(statfs_slow, 0);
TUNE_ATTR(new_files_jdata, 0);
TUNE_ATTR(quota_simul_sync, 1);
TUNE_ATTR(quota_cache_secs, 1);
TUNE_ATTR(stall_secs, 1);
TUNE_ATTR(statfs_quantum, 1);
TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process);
TUNE_ATTR_DAEMON(logd_secs, logd_process);
TUNE_ATTR_DAEMON(quotad_secs, quotad_process);
TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);

static struct attribute *tune_attrs[] = {
        &tune_attr_demote_secs.attr,
        &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_quota_cache_secs.attr,
        &tune_attr_stall_secs.attr,
        &tune_attr_statfs_quantum.attr,
        &tune_attr_recoverd_secs.attr,
        &tune_attr_logd_secs.attr,
        &tune_attr_quotad_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 counters_group = {
        .name = "counters",
        .attrs = counters_attrs,
};

static struct attribute_group args_group = {
        .name = "args",
        .attrs = args_attrs,
};

static struct attribute_group tune_group = {
        .name = "tune",
        .attrs = tune_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, &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);
}


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