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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/slab.h>

#include <linux/spinlock.h>

#include <linux/completion.h>

#include <linux/buffer_head.h>

#include <linux/gfs2_ondisk.h>

#include <linux/lm_interface.h>

#include "gfs2.h"

#include "incore.h"

#include "bmap.h"

#include "glock.h"

#include "glops.h"

#include "inode.h"

#include "log.h"

#include "meta_io.h"

#include "recovery.h"

#include "rgrp.h"

#include "util.h"

#include "trans.h"

/**

 * ail_empty_gl - remove all buffers for a given lock from the AIL

 * @gl: the glock

 *

 * None of the buffers should be dirty, locked, or pinned.

 */

static void gfs2_ail_empty_gl(struct gfs2_glock *gl)

{

        struct gfs2_sbd *sdp = gl->gl_sbd;

        unsigned int blocks;

        struct list_head *head = &gl->gl_ail_list;

        struct gfs2_bufdata *bd;

        struct buffer_head *bh;

        int error;

        blocks = atomic_read(&gl->gl_ail_count);

        if (!blocks)

                return;

        error = gfs2_trans_begin(sdp, 0, blocks);

        if (gfs2_assert_withdraw(sdp, !error))

                return;

        gfs2_log_lock(sdp);

        while (!list_empty(head)) {

                bd = list_entry(head->next, struct gfs2_bufdata,

                                bd_ail_gl_list);

                bh = bd->bd_bh;

                gfs2_remove_from_ail(NULL, bd);

                bd->bd_bh = NULL;

                bh->b_private = NULL;

                bd->bd_blkno = bh->b_blocknr;

                gfs2_assert_withdraw(sdp, !buffer_busy(bh));

                gfs2_trans_add_revoke(sdp, bd);

        }

        gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));

        gfs2_log_unlock(sdp);

        gfs2_trans_end(sdp);

        gfs2_log_flush(sdp, NULL);

}

/**

 * gfs2_pte_inval - Sync and invalidate all PTEs associated with a glock

 * @gl: the glock

 *

 */

static void gfs2_pte_inval(struct gfs2_glock *gl)

{

        struct gfs2_inode *ip;

        struct inode *inode;

        ip = gl->gl_object;

        inode = &ip->i_inode;

        if (!ip || !S_ISREG(inode->i_mode))

                return;

        if (!test_bit(GIF_PAGED, &ip->i_flags))

                return;

        unmap_shared_mapping_range(inode->i_mapping, 0, 0);

        if (test_bit(GIF_SW_PAGED, &ip->i_flags))

                set_bit(GLF_DIRTY, &gl->gl_flags);

        clear_bit(GIF_SW_PAGED, &ip->i_flags);

}

/**

 * meta_go_sync - sync out the metadata for this glock

 * @gl: the glock

 *

 * Called when demoting or unlocking an EX glock.  We must flush

 * to disk all dirty buffers/pages relating to this glock, and must not

 * not return to caller to demote/unlock the glock until I/O is complete.

 */

static void meta_go_sync(struct gfs2_glock *gl)

{

        if (gl->gl_state != LM_ST_EXCLUSIVE)

                return;

        if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) {

                gfs2_log_flush(gl->gl_sbd, gl);

                gfs2_meta_sync(gl);

                gfs2_ail_empty_gl(gl);

        }

}

/**

 * meta_go_inval - invalidate the metadata for this glock

 * @gl: the glock

 * @flags:

 *

 */

static void meta_go_inval(struct gfs2_glock *gl, int flags)

{

        if (!(flags & DIO_METADATA))

                return;

        gfs2_meta_inval(gl);

        gl->gl_vn++;

}

/**

 * inode_go_sync - Sync the dirty data and/or metadata for an inode glock

 * @gl: the glock protecting the inode

 *

 */

static void inode_go_sync(struct gfs2_glock *gl)

{

        struct gfs2_inode *ip = gl->gl_object;

        if (ip && !S_ISREG(ip->i_inode.i_mode))

                ip = NULL;

        if (test_bit(GLF_DIRTY, &gl->gl_flags)) {

                if (ip && !gfs2_is_jdata(ip))

                        filemap_fdatawrite(ip->i_inode.i_mapping);

                gfs2_log_flush(gl->gl_sbd, gl);

                if (ip && gfs2_is_jdata(ip))

                        filemap_fdatawrite(ip->i_inode.i_mapping);

                gfs2_meta_sync(gl);

                if (ip) {

                        struct address_space *mapping = ip->i_inode.i_mapping;

                        int error = filemap_fdatawait(mapping);

                        mapping_set_error(mapping, error);

                }

                clear_bit(GLF_DIRTY, &gl->gl_flags);

                gfs2_ail_empty_gl(gl);

        }

}

/**

 * inode_go_xmote_th - promote/demote a glock

 * @gl: the glock

 * @state: the requested state

 * @flags:

 *

 */

static void inode_go_xmote_th(struct gfs2_glock *gl)

{

        if (gl->gl_state != LM_ST_UNLOCKED)

                gfs2_pte_inval(gl);

        if (gl->gl_state == LM_ST_EXCLUSIVE)

                inode_go_sync(gl);

}

/**

 * inode_go_xmote_bh - After promoting/demoting a glock

 * @gl: the glock

 *

 */

static void inode_go_xmote_bh(struct gfs2_glock *gl)

{

        struct gfs2_holder *gh = gl->gl_req_gh;

        struct buffer_head *bh;

        int error;

        if (gl->gl_state != LM_ST_UNLOCKED &&

            (!gh || !(gh->gh_flags & GL_SKIP))) {

                error = gfs2_meta_read(gl, gl->gl_name.ln_number, 0, &bh);

                if (!error)

                        brelse(bh);

        }

}

/**

 * inode_go_drop_th - unlock a glock

 * @gl: the glock

 *

 * Invoked from rq_demote().

 * Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long)

 * is being purged from our node's glock cache; we're dropping lock.

 */

static void inode_go_drop_th(struct gfs2_glock *gl)

{

        gfs2_pte_inval(gl);

        if (gl->gl_state == LM_ST_EXCLUSIVE)

                inode_go_sync(gl);

}

/**

 * inode_go_inval - prepare a inode glock to be released

 * @gl: the glock

 * @flags:

 *

 */

static void inode_go_inval(struct gfs2_glock *gl, int flags)

{

        struct gfs2_inode *ip = gl->gl_object;

        int meta = (flags & DIO_METADATA);

        if (meta) {

                gfs2_meta_inval(gl);

                if (ip)

                        set_bit(GIF_INVALID, &ip->i_flags);

        }

        if (ip && S_ISREG(ip->i_inode.i_mode)) {

                truncate_inode_pages(ip->i_inode.i_mapping, 0);

                clear_bit(GIF_PAGED, &ip->i_flags);

        }

}

/**

 * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock

 * @gl: the glock

 *

 * Returns: 1 if it's ok

 */

static int inode_go_demote_ok(struct gfs2_glock *gl)

{

        struct gfs2_sbd *sdp = gl->gl_sbd;

        int demote = 0;

        if (!gl->gl_object && !gl->gl_aspace->i_mapping->nrpages)

                demote = 1;

        else if (!sdp->sd_args.ar_localcaching &&

                 time_after_eq(jiffies, gl->gl_stamp +

                               gfs2_tune_get(sdp, gt_demote_secs) * HZ))

                demote = 1;

        return demote;

}

/**

 * inode_go_lock - operation done after an inode lock is locked by a process

 * @gl: the glock

 * @flags:

 *

 * Returns: errno

 */

static int inode_go_lock(struct gfs2_holder *gh)

{

        struct gfs2_glock *gl = gh->gh_gl;

        struct gfs2_inode *ip = gl->gl_object;

        int error = 0;

        if (!ip)

                return 0;

        if (test_bit(GIF_INVALID, &ip->i_flags)) {

                error = gfs2_inode_refresh(ip);

                if (error)

                        return error;

        }

        if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) &&

            (gl->gl_state == LM_ST_EXCLUSIVE) &&

            (gh->gh_state == LM_ST_EXCLUSIVE))

                error = gfs2_truncatei_resume(ip);

        return error;

}

/**

 * inode_go_unlock - operation done before an inode lock is unlocked by a

 *                   process

 * @gl: the glock

 * @flags:

 *

 */

static void inode_go_unlock(struct gfs2_holder *gh)

{

        struct gfs2_glock *gl = gh->gh_gl;

        struct gfs2_inode *ip = gl->gl_object;

        if (ip)

                gfs2_meta_cache_flush(ip);

}

/**

 * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock

 * @gl: the glock

 *

 * Returns: 1 if it's ok

 */

static int rgrp_go_demote_ok(struct gfs2_glock *gl)

{

        return !gl->gl_aspace->i_mapping->nrpages;

}

/**

 * rgrp_go_lock - operation done after an rgrp lock is locked by

 *    a first holder on this node.

 * @gl: the glock

 * @flags:

 *

 * Returns: errno

 */

static int rgrp_go_lock(struct gfs2_holder *gh)

{

        return gfs2_rgrp_bh_get(gh->gh_gl->gl_object);

}

/**

 * rgrp_go_unlock - operation done before an rgrp lock is unlocked by

 *    a last holder on this node.

 * @gl: the glock

 * @flags:

 *

 */

static void rgrp_go_unlock(struct gfs2_holder *gh)

{

        gfs2_rgrp_bh_put(gh->gh_gl->gl_object);

}

/**

 * trans_go_xmote_th - promote/demote the transaction glock

 * @gl: the glock

 * @state: the requested state

 * @flags:

 *

 */

static void trans_go_xmote_th(struct gfs2_glock *gl)

{

        struct gfs2_sbd *sdp = gl->gl_sbd;

        if (gl->gl_state != LM_ST_UNLOCKED &&

            test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {

                gfs2_meta_syncfs(sdp);

                gfs2_log_shutdown(sdp);

        }

}

/**

 * trans_go_xmote_bh - After promoting/demoting the transaction glock

 * @gl: the glock

 *

 */

static void trans_go_xmote_bh(struct gfs2_glock *gl)

{

        struct gfs2_sbd *sdp = gl->gl_sbd;

        struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);

        struct gfs2_glock *j_gl = ip->i_gl;

        struct gfs2_log_header_host head;

        int error;

        if (gl->gl_state != LM_ST_UNLOCKED &&

            test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {

                gfs2_meta_cache_flush(GFS2_I(sdp->sd_jdesc->jd_inode));

                j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);

                error = gfs2_find_jhead(sdp->sd_jdesc, &head);

                if (error)

                        gfs2_consist(sdp);

                if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))

                        gfs2_consist(sdp);

                /*  Initialize some head of the log stuff  */

                if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {

                        sdp->sd_log_sequence = head.lh_sequence + 1;

                        gfs2_log_pointers_init(sdp, head.lh_blkno);

                }

        }

}

/**

 * trans_go_drop_th - unlock the transaction glock

 * @gl: the glock

 *

 * We want to sync the device even with localcaching.  Remember

 * that localcaching journal replay only marks buffers dirty.

 */

static void trans_go_drop_th(struct gfs2_glock *gl)

{

        struct gfs2_sbd *sdp = gl->gl_sbd;

        if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {

                gfs2_meta_syncfs(sdp);

                gfs2_log_shutdown(sdp);

        }

}

/**

 * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock

 * @gl: the glock

 *

 * Returns: 1 if it's ok

 */

static int quota_go_demote_ok(struct gfs2_glock *gl)

{

        return !atomic_read(&gl->gl_lvb_count);

}

const struct gfs2_glock_operations gfs2_meta_glops = {

        .go_xmote_th = meta_go_sync,

        .go_drop_th = meta_go_sync,

        .go_type = LM_TYPE_META,

};

const struct gfs2_glock_operations gfs2_inode_glops = {

        .go_xmote_th = inode_go_xmote_th,

        .go_xmote_bh = inode_go_xmote_bh,

        .go_drop_th = inode_go_drop_th,

        .go_inval = inode_go_inval,

        .go_demote_ok = inode_go_demote_ok,

        .go_lock = inode_go_lock,

        .go_unlock = inode_go_unlock,

        .go_type = LM_TYPE_INODE,

        .go_min_hold_time = HZ / 10,

};

const struct gfs2_glock_operations gfs2_rgrp_glops = {

        .go_xmote_th = meta_go_sync,

        .go_drop_th = meta_go_sync,

        .go_inval = meta_go_inval,

        .go_demote_ok = rgrp_go_demote_ok,

        .go_lock = rgrp_go_lock,

        .go_unlock = rgrp_go_unlock,

        .go_type = LM_TYPE_RGRP,

        .go_min_hold_time = HZ / 10,

};

const struct gfs2_glock_operations gfs2_trans_glops = {

        .go_xmote_th = trans_go_xmote_th,

        .go_xmote_bh = trans_go_xmote_bh,

        .go_drop_th = trans_go_drop_th,

        .go_type = LM_TYPE_NONDISK,

};

const struct gfs2_glock_operations gfs2_iopen_glops = {

        .go_type = LM_TYPE_IOPEN,

};

const struct gfs2_glock_operations gfs2_flock_glops = {

        .go_type = LM_TYPE_FLOCK,

};

const struct gfs2_glock_operations gfs2_nondisk_glops = {

        .go_type = LM_TYPE_NONDISK,

};

const struct gfs2_glock_operations gfs2_quota_glops = {

        .go_demote_ok = quota_go_demote_ok,

        .go_type = LM_TYPE_QUOTA,

};

const struct gfs2_glock_operations gfs2_journal_glops = {

        .go_type = LM_TYPE_JOURNAL,

};