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/*

 * 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 "lm.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, "%s\n", sdp->sd_vfs->s_id);

}

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 shrink_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_gl_hash_clear(sdp, NO_WAIT);

        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(shrink,              0200, NULL,          shrink_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_shrink.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 = {

        .ktype  = &gfs2_ktype,

};

/*

 * 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");

/* one oddball doesn't fit the macro mold */

static ssize_t noatime_show(struct gfs2_sbd *sdp, char *buf)

{

        return snprintf(buf, PAGE_SIZE, "%d\n",

                        !!test_bit(SDF_NOATIME, &sdp->sd_flags));

}

static struct args_attr args_attr_noatime = __ATTR_RO(noatime);

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,

        &args_attr_noatime.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(glock_count,      "%u\n");

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

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

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

static struct attribute *counters_attrs[] = {

        &counters_attr_glock_count.attr,

        &counters_attr_glock_held_count.attr,

        &counters_attr_inode_count.attr,

        &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(jindex_refresh_secs, 0);

TUNE_ATTR(quota_warn_period, 0);

TUNE_ATTR(quota_quantum, 0);

TUNE_ATTR(atime_quantum, 0);

TUNE_ATTR(max_readahead, 0);

TUNE_ATTR(complain_secs, 0);

TUNE_ATTR(reclaim_limit, 0);

TUNE_ATTR(statfs_slow, 0);

TUNE_ATTR(new_files_jdata, 0);

TUNE_ATTR(new_files_directio, 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_jindex_refresh_secs.attr,

        &tune_attr_quota_warn_period.attr,

        &tune_attr_quota_quantum.attr,

        &tune_attr_atime_quantum.attr,

        &tune_attr_max_readahead.attr,

        &tune_attr_complain_secs.attr,

        &tune_attr_reclaim_limit.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,

        &tune_attr_new_files_directio.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;

        sdp->sd_kobj.ktype = &gfs2_ktype;

        error = kobject_set_name(&sdp->sd_kobj, "%s", sdp->sd_table_name);

        if (error)

                goto fail;

        error = kobject_register(&sdp->sd_kobj);

        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;

        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_unregister(&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_unregister(&sdp->sd_kobj);

}

int gfs2_sys_init(void)

{

        gfs2_sys_margs = NULL;

        spin_lock_init(&gfs2_sys_margs_lock);

        kobject_set_name(&gfs2_kset.kobj, "gfs2");

        kobj_set_kset_s(&gfs2_kset, fs_subsys);

        return kset_register(&gfs2_kset);

}

void gfs2_sys_uninit(void)

{

        kfree(gfs2_sys_margs);

        kset_unregister(&gfs2_kset);

}