Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney...

[linux-2.6/kmemtrace.git] / fs / gfs2 / ops_fstype.c

/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2008 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/blkdev.h>
#include <linux/kthread.h>
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>

#include "gfs2.h"
#include "incore.h"
#include "bmap.h"
#include "daemon.h"
#include "glock.h"
#include "glops.h"
#include "inode.h"
#include "mount.h"
#include "ops_fstype.h"
#include "ops_dentry.h"
#include "ops_super.h"
#include "recovery.h"
#include "rgrp.h"
#include "super.h"
#include "sys.h"
#include "util.h"
#include "log.h"

#define DO 0
#define UNDO 1

static struct gfs2_sbd *init_sbd(struct super_block *sb)
{
        struct gfs2_sbd *sdp;

        sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
        if (!sdp)
                return NULL;

        sb->s_fs_info = sdp;
        sdp->sd_vfs = sb;

        gfs2_tune_init(&sdp->sd_tune);

        INIT_LIST_HEAD(&sdp->sd_reclaim_list);
        spin_lock_init(&sdp->sd_reclaim_lock);
        init_waitqueue_head(&sdp->sd_reclaim_wq);

        mutex_init(&sdp->sd_inum_mutex);
        spin_lock_init(&sdp->sd_statfs_spin);

        spin_lock_init(&sdp->sd_rindex_spin);
        mutex_init(&sdp->sd_rindex_mutex);
        INIT_LIST_HEAD(&sdp->sd_rindex_list);
        INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
        INIT_LIST_HEAD(&sdp->sd_rindex_recent_list);

        INIT_LIST_HEAD(&sdp->sd_jindex_list);
        spin_lock_init(&sdp->sd_jindex_spin);
        mutex_init(&sdp->sd_jindex_mutex);

        INIT_LIST_HEAD(&sdp->sd_quota_list);
        spin_lock_init(&sdp->sd_quota_spin);
        mutex_init(&sdp->sd_quota_mutex);

        spin_lock_init(&sdp->sd_log_lock);

        INIT_LIST_HEAD(&sdp->sd_log_le_buf);
        INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
        INIT_LIST_HEAD(&sdp->sd_log_le_rg);
        INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
        INIT_LIST_HEAD(&sdp->sd_log_le_ordered);

        mutex_init(&sdp->sd_log_reserve_mutex);
        INIT_LIST_HEAD(&sdp->sd_ail1_list);
        INIT_LIST_HEAD(&sdp->sd_ail2_list);

        init_rwsem(&sdp->sd_log_flush_lock);
        atomic_set(&sdp->sd_log_in_flight, 0);
        init_waitqueue_head(&sdp->sd_log_flush_wait);

        INIT_LIST_HEAD(&sdp->sd_revoke_list);

        mutex_init(&sdp->sd_freeze_lock);

        return sdp;
}

static void init_vfs(struct super_block *sb, unsigned noatime)
{
        struct gfs2_sbd *sdp = sb->s_fs_info;

        sb->s_magic = GFS2_MAGIC;
        sb->s_op = &gfs2_super_ops;
        sb->s_export_op = &gfs2_export_ops;
        sb->s_time_gran = 1;
        sb->s_maxbytes = MAX_LFS_FILESIZE;

        if (sb->s_flags & (MS_NOATIME | MS_NODIRATIME))
                set_bit(noatime, &sdp->sd_flags);

        /* Don't let the VFS update atimes.  GFS2 handles this itself. */
        sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
}

static int init_names(struct gfs2_sbd *sdp, int silent)
{
        char *proto, *table;
        int error = 0;

        proto = sdp->sd_args.ar_lockproto;
        table = sdp->sd_args.ar_locktable;

        /*  Try to autodetect  */

        if (!proto[0] || !table[0]) {
                error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
                if (error)
                        return error;

                error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
                if (error)
                        goto out;

                if (!proto[0])
                        proto = sdp->sd_sb.sb_lockproto;
                if (!table[0])
                        table = sdp->sd_sb.sb_locktable;
        }

        if (!table[0])
                table = sdp->sd_vfs->s_id;

        strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
        strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);

        table = sdp->sd_table_name;
        while ((table = strchr(table, '/')))
                *table = '_';

out:
        return error;
}

static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
                        int undo)
{
        struct task_struct *p;
        int error = 0;

        if (undo)
                goto fail_trans;

        for (sdp->sd_glockd_num = 0;
             sdp->sd_glockd_num < sdp->sd_args.ar_num_glockd;
             sdp->sd_glockd_num++) {
                p = kthread_run(gfs2_glockd, sdp, "gfs2_glockd");
                error = IS_ERR(p);
                if (error) {
                        fs_err(sdp, "can't start glockd thread: %d\n", error);
                        goto fail;
                }
                sdp->sd_glockd_process[sdp->sd_glockd_num] = p;
        }

        error = gfs2_glock_nq_num(sdp,
                                  GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
                                  LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
                                  mount_gh);
        if (error) {
                fs_err(sdp, "can't acquire mount glock: %d\n", error);
                goto fail;
        }

        error = gfs2_glock_nq_num(sdp,
                                  GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
                                  LM_ST_SHARED,
                                  LM_FLAG_NOEXP | GL_EXACT,
                                  &sdp->sd_live_gh);
        if (error) {
                fs_err(sdp, "can't acquire live glock: %d\n", error);
                goto fail_mount;
        }

        error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
                               CREATE, &sdp->sd_rename_gl);
        if (error) {
                fs_err(sdp, "can't create rename glock: %d\n", error);
                goto fail_live;
        }

        error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
                               CREATE, &sdp->sd_trans_gl);
        if (error) {
                fs_err(sdp, "can't create transaction glock: %d\n", error);
                goto fail_rename;
        }
        set_bit(GLF_STICKY, &sdp->sd_trans_gl->gl_flags);

        return 0;

fail_trans:
        gfs2_glock_put(sdp->sd_trans_gl);
fail_rename:
        gfs2_glock_put(sdp->sd_rename_gl);
fail_live:
        gfs2_glock_dq_uninit(&sdp->sd_live_gh);
fail_mount:
        gfs2_glock_dq_uninit(mount_gh);
fail:
        while (sdp->sd_glockd_num--)
                kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);

        return error;
}

static inline struct inode *gfs2_lookup_root(struct super_block *sb,
                                             u64 no_addr)
{
        return gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
}

static int init_sb(struct gfs2_sbd *sdp, int silent, int undo)
{
        struct super_block *sb = sdp->sd_vfs;
        struct gfs2_holder sb_gh;
        u64 no_addr;
        struct inode *inode;
        int error = 0;

        if (undo) {
                if (sb->s_root) {
                        dput(sb->s_root);
                        sb->s_root = NULL;
                }
                return 0;
        }

        error = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
                                 LM_ST_SHARED, 0, &sb_gh);
        if (error) {
                fs_err(sdp, "can't acquire superblock glock: %d\n", error);
                return error;
        }

        error = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
        if (error) {
                fs_err(sdp, "can't read superblock: %d\n", error);
                goto out;
        }

        /* Set up the buffer cache and SB for real */
        if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
                error = -EINVAL;
                fs_err(sdp, "FS block size (%u) is too small for device "
                       "block size (%u)\n",
                       sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
                goto out;
        }
        if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
                error = -EINVAL;
                fs_err(sdp, "FS block size (%u) is too big for machine "
                       "page size (%u)\n",
                       sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
                goto out;
        }
        sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);

        /* Get the root inode */
        no_addr = sdp->sd_sb.sb_root_dir.no_addr;
        if (sb->s_type == &gfs2meta_fs_type)
                no_addr = sdp->sd_sb.sb_master_dir.no_addr;
        inode = gfs2_lookup_root(sb, no_addr);
        if (IS_ERR(inode)) {
                error = PTR_ERR(inode);
                fs_err(sdp, "can't read in root inode: %d\n", error);
                goto out;
        }

        sb->s_root = d_alloc_root(inode);
        if (!sb->s_root) {
                fs_err(sdp, "can't get root dentry\n");
                error = -ENOMEM;
                iput(inode);
        } else
                sb->s_root->d_op = &gfs2_dops;
        
out:
        gfs2_glock_dq_uninit(&sb_gh);
        return error;
}

/**
 * map_journal_extents - create a reusable "extent" mapping from all logical
 * blocks to all physical blocks for the given journal.  This will save
 * us time when writing journal blocks.  Most journals will have only one
 * extent that maps all their logical blocks.  That's because gfs2.mkfs
 * arranges the journal blocks sequentially to maximize performance.
 * So the extent would map the first block for the entire file length.
 * However, gfs2_jadd can happen while file activity is happening, so
 * those journals may not be sequential.  Less likely is the case where
 * the users created their own journals by mounting the metafs and
 * laying it out.  But it's still possible.  These journals might have
 * several extents.
 *
 * TODO: This should be done in bigger chunks rather than one block at a time,
 *       but since it's only done at mount time, I'm not worried about the
 *       time it takes.
 */
static int map_journal_extents(struct gfs2_sbd *sdp)
{
        struct gfs2_jdesc *jd = sdp->sd_jdesc;
        unsigned int lb;
        u64 db, prev_db; /* logical block, disk block, prev disk block */
        struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
        struct gfs2_journal_extent *jext = NULL;
        struct buffer_head bh;
        int rc = 0;

        prev_db = 0;

        for (lb = 0; lb < ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift; lb++) {
                bh.b_state = 0;
                bh.b_blocknr = 0;
                bh.b_size = 1 << ip->i_inode.i_blkbits;
                rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
                db = bh.b_blocknr;
                if (rc || !db) {
                        printk(KERN_INFO "GFS2 journal mapping error %d: lb="
                               "%u db=%llu\n", rc, lb, (unsigned long long)db);
                        break;
                }
                if (!prev_db || db != prev_db + 1) {
                        jext = kzalloc(sizeof(struct gfs2_journal_extent),
                                       GFP_KERNEL);
                        if (!jext) {
                                printk(KERN_INFO "GFS2 error: out of memory "
                                       "mapping journal extents.\n");
                                rc = -ENOMEM;
                                break;
                        }
                        jext->dblock = db;
                        jext->lblock = lb;
                        jext->blocks = 1;
                        list_add_tail(&jext->extent_list, &jd->extent_list);
                } else {
                        jext->blocks++;
                }
                prev_db = db;
        }
        return rc;
}

static void gfs2_lm_others_may_mount(struct gfs2_sbd *sdp)
{
        if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
                sdp->sd_lockstruct.ls_ops->lm_others_may_mount(
                                        sdp->sd_lockstruct.ls_lockspace);
}

static int init_journal(struct gfs2_sbd *sdp, int undo)
{
        struct gfs2_holder ji_gh;
        struct task_struct *p;
        struct gfs2_inode *ip;
        int jindex = 1;
        int error = 0;

        if (undo) {
                jindex = 0;
                goto fail_recoverd;
        }

        sdp->sd_jindex = gfs2_lookup_simple(sdp->sd_master_dir, "jindex");
        if (IS_ERR(sdp->sd_jindex)) {
                fs_err(sdp, "can't lookup journal index: %d\n", error);
                return PTR_ERR(sdp->sd_jindex);
        }
        ip = GFS2_I(sdp->sd_jindex);
        set_bit(GLF_STICKY, &ip->i_gl->gl_flags);

        /* Load in the journal index special file */

        error = gfs2_jindex_hold(sdp, &ji_gh);
        if (error) {
                fs_err(sdp, "can't read journal index: %d\n", error);
                goto fail;
        }

        error = -EINVAL;
        if (!gfs2_jindex_size(sdp)) {
                fs_err(sdp, "no journals!\n");
                goto fail_jindex;
        }

        if (sdp->sd_args.ar_spectator) {
                sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
                atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
        } else {
                if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
                        fs_err(sdp, "can't mount journal #%u\n",
                               sdp->sd_lockstruct.ls_jid);
                        fs_err(sdp, "there are only %u journals (0 - %u)\n",
                               gfs2_jindex_size(sdp),
                               gfs2_jindex_size(sdp) - 1);
                        goto fail_jindex;
                }
                sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);

                error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
                                          &gfs2_journal_glops,
                                          LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
                                          &sdp->sd_journal_gh);
                if (error) {
                        fs_err(sdp, "can't acquire journal glock: %d\n", error);
                        goto fail_jindex;
                }

                ip = GFS2_I(sdp->sd_jdesc->jd_inode);
                error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
                                           LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
                                           &sdp->sd_jinode_gh);
                if (error) {
                        fs_err(sdp, "can't acquire journal inode glock: %d\n",
                               error);
                        goto fail_journal_gh;
                }

                error = gfs2_jdesc_check(sdp->sd_jdesc);
                if (error) {
                        fs_err(sdp, "my journal (%u) is bad: %d\n",
                               sdp->sd_jdesc->jd_jid, error);
                        goto fail_jinode_gh;
                }
                atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);

                /* Map the extents for this journal's blocks */
                map_journal_extents(sdp);
        }

        if (sdp->sd_lockstruct.ls_first) {
                unsigned int x;
                for (x = 0; x < sdp->sd_journals; x++) {
                        error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
                        if (error) {
                                fs_err(sdp, "error recovering journal %u: %d\n",
                                       x, error);
                                goto fail_jinode_gh;
                        }
                }

                gfs2_lm_others_may_mount(sdp);
        } else if (!sdp->sd_args.ar_spectator) {
                error = gfs2_recover_journal(sdp->sd_jdesc);
                if (error) {
                        fs_err(sdp, "error recovering my journal: %d\n", error);
                        goto fail_jinode_gh;
                }
        }

        set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
        gfs2_glock_dq_uninit(&ji_gh);
        jindex = 0;

        p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
        error = IS_ERR(p);
        if (error) {
                fs_err(sdp, "can't start recoverd thread: %d\n", error);
                goto fail_jinode_gh;
        }
        sdp->sd_recoverd_process = p;

        return 0;

fail_recoverd:
        kthread_stop(sdp->sd_recoverd_process);
fail_jinode_gh:
        if (!sdp->sd_args.ar_spectator)
                gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
fail_journal_gh:
        if (!sdp->sd_args.ar_spectator)
                gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
fail_jindex:
        gfs2_jindex_free(sdp);
        if (jindex)
                gfs2_glock_dq_uninit(&ji_gh);
fail:
        iput(sdp->sd_jindex);
        return error;
}


static int init_inodes(struct gfs2_sbd *sdp, int undo)
{
        int error = 0;
        struct gfs2_inode *ip;
        struct inode *inode;

        if (undo)
                goto fail_qinode;

        inode = gfs2_lookup_root(sdp->sd_vfs, sdp->sd_sb.sb_master_dir.no_addr);
        if (IS_ERR(inode)) {
                error = PTR_ERR(inode);
                fs_err(sdp, "can't read in master directory: %d\n", error);
                goto fail;
        }
        sdp->sd_master_dir = inode;

        error = init_journal(sdp, undo);
        if (error)
                goto fail_master;

        /* Read in the master inode number inode */
        sdp->sd_inum_inode = gfs2_lookup_simple(sdp->sd_master_dir, "inum");
        if (IS_ERR(sdp->sd_inum_inode)) {
                error = PTR_ERR(sdp->sd_inum_inode);
                fs_err(sdp, "can't read in inum inode: %d\n", error);
                goto fail_journal;
        }


        /* Read in the master statfs inode */
        sdp->sd_statfs_inode = gfs2_lookup_simple(sdp->sd_master_dir, "statfs");
        if (IS_ERR(sdp->sd_statfs_inode)) {
                error = PTR_ERR(sdp->sd_statfs_inode);
                fs_err(sdp, "can't read in statfs inode: %d\n", error);
                goto fail_inum;
        }

        /* Read in the resource index inode */
        sdp->sd_rindex = gfs2_lookup_simple(sdp->sd_master_dir, "rindex");
        if (IS_ERR(sdp->sd_rindex)) {
                error = PTR_ERR(sdp->sd_rindex);
                fs_err(sdp, "can't get resource index inode: %d\n", error);
                goto fail_statfs;
        }
        ip = GFS2_I(sdp->sd_rindex);
        set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
        sdp->sd_rindex_uptodate = 0;

        /* Read in the quota inode */
        sdp->sd_quota_inode = gfs2_lookup_simple(sdp->sd_master_dir, "quota");
        if (IS_ERR(sdp->sd_quota_inode)) {
                error = PTR_ERR(sdp->sd_quota_inode);
                fs_err(sdp, "can't get quota file inode: %d\n", error);
                goto fail_rindex;
        }
        return 0;

fail_qinode:
        iput(sdp->sd_quota_inode);
fail_rindex:
        gfs2_clear_rgrpd(sdp);
        iput(sdp->sd_rindex);
fail_statfs:
        iput(sdp->sd_statfs_inode);
fail_inum:
        iput(sdp->sd_inum_inode);
fail_journal:
        init_journal(sdp, UNDO);
fail_master:
        iput(sdp->sd_master_dir);
fail:
        return error;
}

static int init_per_node(struct gfs2_sbd *sdp, int undo)
{
        struct inode *pn = NULL;
        char buf[30];
        int error = 0;
        struct gfs2_inode *ip;

        if (sdp->sd_args.ar_spectator)
                return 0;

        if (undo)
                goto fail_qc_gh;

        pn = gfs2_lookup_simple(sdp->sd_master_dir, "per_node");
        if (IS_ERR(pn)) {
                error = PTR_ERR(pn);
                fs_err(sdp, "can't find per_node directory: %d\n", error);
                return error;
        }

        sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
        sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
        if (IS_ERR(sdp->sd_ir_inode)) {
                error = PTR_ERR(sdp->sd_ir_inode);
                fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
                goto fail;
        }

        sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
        sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
        if (IS_ERR(sdp->sd_sc_inode)) {
                error = PTR_ERR(sdp->sd_sc_inode);
                fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
                goto fail_ir_i;
        }

        sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
        sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
        if (IS_ERR(sdp->sd_qc_inode)) {
                error = PTR_ERR(sdp->sd_qc_inode);
                fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
                goto fail_ut_i;
        }

        iput(pn);
        pn = NULL;

        ip = GFS2_I(sdp->sd_ir_inode);
        error = gfs2_glock_nq_init(ip->i_gl,
                                   LM_ST_EXCLUSIVE, 0,
                                   &sdp->sd_ir_gh);
        if (error) {
                fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
                goto fail_qc_i;
        }

        ip = GFS2_I(sdp->sd_sc_inode);
        error = gfs2_glock_nq_init(ip->i_gl,
                                   LM_ST_EXCLUSIVE, 0,
                                   &sdp->sd_sc_gh);
        if (error) {
                fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
                goto fail_ir_gh;
        }

        ip = GFS2_I(sdp->sd_qc_inode);
        error = gfs2_glock_nq_init(ip->i_gl,
                                   LM_ST_EXCLUSIVE, 0,
                                   &sdp->sd_qc_gh);
        if (error) {
                fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
                goto fail_ut_gh;
        }

        return 0;

fail_qc_gh:
        gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
fail_ut_gh:
        gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
fail_ir_gh:
        gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
fail_qc_i:
        iput(sdp->sd_qc_inode);
fail_ut_i:
        iput(sdp->sd_sc_inode);
fail_ir_i:
        iput(sdp->sd_ir_inode);
fail:
        if (pn)
                iput(pn);
        return error;
}

static int init_threads(struct gfs2_sbd *sdp, int undo)
{
        struct task_struct *p;
        int error = 0;

        if (undo)
                goto fail_quotad;

        sdp->sd_log_flush_time = jiffies;
        sdp->sd_jindex_refresh_time = jiffies;

        p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
        error = IS_ERR(p);
        if (error) {
                fs_err(sdp, "can't start logd thread: %d\n", error);
                return error;
        }
        sdp->sd_logd_process = p;

        sdp->sd_statfs_sync_time = jiffies;
        sdp->sd_quota_sync_time = jiffies;

        p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
        error = IS_ERR(p);
        if (error) {
                fs_err(sdp, "can't start quotad thread: %d\n", error);
                goto fail;
        }
        sdp->sd_quotad_process = p;

        return 0;


fail_quotad:
        kthread_stop(sdp->sd_quotad_process);
fail:
        kthread_stop(sdp->sd_logd_process);
        return error;
}

/**
 * gfs2_lm_mount - mount a locking protocol
 * @sdp: the filesystem
 * @args: mount arguements
 * @silent: if 1, don't complain if the FS isn't a GFS2 fs
 *
 * Returns: errno
 */

static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
{
        char *proto = sdp->sd_proto_name;
        char *table = sdp->sd_table_name;
        int flags = LM_MFLAG_CONV_NODROP;
        int error;

        if (sdp->sd_args.ar_spectator)
                flags |= LM_MFLAG_SPECTATOR;

        fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);

        error = gfs2_mount_lockproto(proto, table, sdp->sd_args.ar_hostdata,
                                     gfs2_glock_cb, sdp,
                                     GFS2_MIN_LVB_SIZE, flags,
                                     &sdp->sd_lockstruct, &sdp->sd_kobj);
        if (error) {
                fs_info(sdp, "can't mount proto=%s, table=%s, hostdata=%s\n",
                        proto, table, sdp->sd_args.ar_hostdata);
                goto out;
        }

        if (gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_lockspace) ||
            gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_ops) ||
            gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_lvb_size >=
                                  GFS2_MIN_LVB_SIZE)) {
                gfs2_unmount_lockproto(&sdp->sd_lockstruct);
                goto out;
        }

        if (sdp->sd_args.ar_spectator)
                snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
        else
                snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
                         sdp->sd_lockstruct.ls_jid);

        fs_info(sdp, "Joined cluster. Now mounting FS...\n");

        if ((sdp->sd_lockstruct.ls_flags & LM_LSFLAG_LOCAL) &&
            !sdp->sd_args.ar_ignore_local_fs) {
                sdp->sd_args.ar_localflocks = 1;
                sdp->sd_args.ar_localcaching = 1;
        }

out:
        return error;
}

void gfs2_lm_unmount(struct gfs2_sbd *sdp)
{
        if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
                gfs2_unmount_lockproto(&sdp->sd_lockstruct);
}

/**
 * fill_super - Read in superblock
 * @sb: The VFS superblock
 * @data: Mount options
 * @silent: Don't complain if it's not a GFS2 filesystem
 *
 * Returns: errno
 */

static int fill_super(struct super_block *sb, void *data, int silent)
{
        struct gfs2_sbd *sdp;
        struct gfs2_holder mount_gh;
        int error;

        sdp = init_sbd(sb);
        if (!sdp) {
                printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
                return -ENOMEM;
        }

        error = gfs2_mount_args(sdp, (char *)data, 0);
        if (error) {
                printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
                goto fail;
        }

        init_vfs(sb, SDF_NOATIME);

        /* Set up the buffer cache and fill in some fake block size values
           to allow us to read-in the on-disk superblock. */
        sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
        sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
        sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
                               GFS2_BASIC_BLOCK_SHIFT;
        sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;

        error = init_names(sdp, silent);
        if (error)
                goto fail;

        gfs2_create_debugfs_file(sdp);

        error = gfs2_sys_fs_add(sdp);
        if (error)
                goto fail;

        error = gfs2_lm_mount(sdp, silent);
        if (error)
                goto fail_sys;

        error = init_locking(sdp, &mount_gh, DO);
        if (error)
                goto fail_lm;

        error = init_sb(sdp, silent, DO);
        if (error)
                goto fail_locking;

        error = init_inodes(sdp, DO);
        if (error)
                goto fail_sb;

        error = init_per_node(sdp, DO);
        if (error)
                goto fail_inodes;

        error = gfs2_statfs_init(sdp);
        if (error) {
                fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
                goto fail_per_node;
        }

        error = init_threads(sdp, DO);
        if (error)
                goto fail_per_node;

        if (!(sb->s_flags & MS_RDONLY)) {
                error = gfs2_make_fs_rw(sdp);
                if (error) {
                        fs_err(sdp, "can't make FS RW: %d\n", error);
                        goto fail_threads;
                }
        }

        gfs2_glock_dq_uninit(&mount_gh);

        return 0;

fail_threads:
        init_threads(sdp, UNDO);
fail_per_node:
        init_per_node(sdp, UNDO);
fail_inodes:
        init_inodes(sdp, UNDO);
fail_sb:
        init_sb(sdp, 0, UNDO);
fail_locking:
        init_locking(sdp, &mount_gh, UNDO);
fail_lm:
        gfs2_gl_hash_clear(sdp, WAIT);
        gfs2_lm_unmount(sdp);
        while (invalidate_inodes(sb))
                yield();
fail_sys:
        gfs2_sys_fs_del(sdp);
fail:
        gfs2_delete_debugfs_file(sdp);
        kfree(sdp);
        sb->s_fs_info = NULL;
        return error;
}

static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
                const char *dev_name, void *data, struct vfsmount *mnt)
{
        struct super_block *sb;
        struct gfs2_sbd *sdp;
        int error = get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
        if (error)
                goto out;
        sb = mnt->mnt_sb;
        sdp = sb->s_fs_info;
        sdp->sd_gfs2mnt = mnt;
out:
        return error;
}

static int fill_super_meta(struct super_block *sb, struct super_block *new,
                           void *data, int silent)
{
        struct gfs2_sbd *sdp = sb->s_fs_info;
        struct inode *inode;
        int error = 0;

        new->s_fs_info = sdp;
        sdp->sd_vfs_meta = sb;

        init_vfs(new, SDF_NOATIME);

        /* Get the master inode */
        inode = igrab(sdp->sd_master_dir);

        new->s_root = d_alloc_root(inode);
        if (!new->s_root) {
                fs_err(sdp, "can't get root dentry\n");
                error = -ENOMEM;
                iput(inode);
        } else
                new->s_root->d_op = &gfs2_dops;

        return error;
}

static int set_bdev_super(struct super_block *s, void *data)
{
        s->s_bdev = data;
        s->s_dev = s->s_bdev->bd_dev;
        return 0;
}

static int test_bdev_super(struct super_block *s, void *data)
{
        return s->s_bdev == data;
}

static struct super_block* get_gfs2_sb(const char *dev_name)
{
        struct kstat stat;
        struct nameidata nd;
        struct super_block *sb = NULL, *s;
        int error;

        error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
        if (error) {
                printk(KERN_WARNING "GFS2: path_lookup on %s returned error\n",
                       dev_name);
                goto out;
        }
        error = vfs_getattr(nd.path.mnt, nd.path.dentry, &stat);

        list_for_each_entry(s, &gfs2_fs_type.fs_supers, s_instances) {
                if ((S_ISBLK(stat.mode) && s->s_dev == stat.rdev) ||
                    (S_ISDIR(stat.mode) &&
                     s == nd.path.dentry->d_inode->i_sb)) {
                        sb = s;
                        goto free_nd;
                }
        }

        printk(KERN_WARNING "GFS2: Unrecognized block device or "
               "mount point %s\n", dev_name);

free_nd:
        path_put(&nd.path);
out:
        return sb;
}

static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
                            const char *dev_name, void *data, struct vfsmount *mnt)
{
        int error = 0;
        struct super_block *sb = NULL, *new;
        struct gfs2_sbd *sdp;

        sb = get_gfs2_sb(dev_name);
        if (!sb) {
                printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
                error = -ENOENT;
                goto error;
        }
        sdp = sb->s_fs_info;
        if (sdp->sd_vfs_meta) {
                printk(KERN_WARNING "GFS2: gfs2meta mount already exists\n");
                error = -EBUSY;
                goto error;
        }
        down(&sb->s_bdev->bd_mount_sem);
        new = sget(fs_type, test_bdev_super, set_bdev_super, sb->s_bdev);
        up(&sb->s_bdev->bd_mount_sem);
        if (IS_ERR(new)) {
                error = PTR_ERR(new);
                goto error;
        }
        new->s_flags = flags;
        strlcpy(new->s_id, sb->s_id, sizeof(new->s_id));
        sb_set_blocksize(new, sb->s_blocksize);
        error = fill_super_meta(sb, new, data, flags & MS_SILENT ? 1 : 0);
        if (error) {
                up_write(&new->s_umount);
                deactivate_super(new);
                goto error;
        }

        new->s_flags |= MS_ACTIVE;

        /* Grab a reference to the gfs2 mount point */
        atomic_inc(&sdp->sd_gfs2mnt->mnt_count);
        return simple_set_mnt(mnt, new);
error:
        return error;
}

static void gfs2_kill_sb(struct super_block *sb)
{
        if (sb->s_fs_info) {
                gfs2_delete_debugfs_file(sb->s_fs_info);
                gfs2_meta_syncfs(sb->s_fs_info);
        }
        kill_block_super(sb);
}

static void gfs2_kill_sb_meta(struct super_block *sb)
{
        struct gfs2_sbd *sdp = sb->s_fs_info;
        generic_shutdown_super(sb);
        sdp->sd_vfs_meta = NULL;
        atomic_dec(&sdp->sd_gfs2mnt->mnt_count);
}

struct file_system_type gfs2_fs_type = {
        .name = "gfs2",
        .fs_flags = FS_REQUIRES_DEV,
        .get_sb = gfs2_get_sb,
        .kill_sb = gfs2_kill_sb,
        .owner = THIS_MODULE,
};

struct file_system_type gfs2meta_fs_type = {
        .name = "gfs2meta",
        .fs_flags = FS_REQUIRES_DEV,
        .get_sb = gfs2_get_sb_meta,
        .kill_sb = gfs2_kill_sb_meta,
        .owner = THIS_MODULE,
};