/*
   * 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/gfs2_ondisk.h>

  #include <linux/kallsyms.h>

  #include <linux/lm_interface.h>

  
  #include "gfs2.h"

  #include "incore.h"

  #include "glock.h"
  #include "log.h"
  #include "lops.h"
  #include "meta_io.h"
  #include "trans.h"

  #include "util.h"

  int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
  		     unsigned int revokes)

  {
  	struct gfs2_trans *tr;
  	int error;

  	BUG_ON(current->journal_info);
  	BUG_ON(blocks == 0 && revokes == 0);

  	tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);

  	if (!tr)
  		return -ENOMEM;

  	tr->tr_ip = (unsigned long)__builtin_return_address(0);

  	tr->tr_blocks = blocks;
  	tr->tr_revokes = revokes;
  	tr->tr_reserved = 1;
  	if (blocks)

  		tr->tr_reserved += 6 + blocks;

  	if (revokes)
  		tr->tr_reserved += gfs2_struct2blk(sdp, revokes,

  						   sizeof(u64));

  	INIT_LIST_HEAD(&tr->tr_list_buf);

  	gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh);

  	error = gfs2_glock_nq(&tr->tr_t_gh);

  	if (error)

  		goto fail_holder_uninit;

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

  		tr->tr_t_gh.gh_flags |= GL_NOCACHE;

  		error = -EROFS;
  		goto fail_gunlock;
  	}
  
  	error = gfs2_log_reserve(sdp, tr->tr_reserved);
  	if (error)
  		goto fail_gunlock;

  	current->journal_info = tr;

  
  	return 0;

  fail_gunlock:

  	gfs2_glock_dq(&tr->tr_t_gh);

  fail_holder_uninit:

  	gfs2_holder_uninit(&tr->tr_t_gh);

  	kfree(tr);
  
  	return error;
  }
  
  void gfs2_trans_end(struct gfs2_sbd *sdp)
  {

  	struct gfs2_trans *tr = current->journal_info;

  	BUG_ON(!tr);

  	current->journal_info = NULL;

  	if (!tr->tr_touched) {
  		gfs2_log_release(sdp, tr->tr_reserved);

  		gfs2_glock_dq(&tr->tr_t_gh);
  		gfs2_holder_uninit(&tr->tr_t_gh);

  		kfree(tr);

  		return;
  	}

  	if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) {
  		fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u ",
  		       tr->tr_num_buf, tr->tr_blocks);
  		print_symbol(KERN_WARNING "GFS2: Transaction created at: %s
  ", tr->tr_ip);
  	}

  	if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) {

  		fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u ",
  		       tr->tr_num_revoke, tr->tr_revokes);
  		print_symbol(KERN_WARNING "GFS2: Transaction created at: %s
  ", tr->tr_ip);

  	}

  
  	gfs2_log_commit(sdp, tr);

          gfs2_glock_dq(&tr->tr_t_gh);
          gfs2_holder_uninit(&tr->tr_t_gh);

          kfree(tr);

  
  	if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)

  		gfs2_log_flush(sdp, NULL);

  }
  
  void gfs2_trans_add_gl(struct gfs2_glock *gl)
  {
  	lops_add(gl->gl_sbd, &gl->gl_le);
  }
  
  /**
   * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
   * @gl: the glock the buffer belongs to
   * @bh: The buffer to add

   * @meta: True in the case of adding metadata

   *
   */

  void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta)

  {
  	struct gfs2_sbd *sdp = gl->gl_sbd;
  	struct gfs2_bufdata *bd;

  	bd = bh->b_private;

  	if (bd)
  		gfs2_assert(sdp, bd->bd_gl == gl);
  	else {

  		gfs2_attach_bufdata(gl, bh, meta);

  		bd = bh->b_private;

  	}

  	lops_add(sdp, &bd->bd_le);
  }

  void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, u64 blkno)

  {
  	struct gfs2_revoke *rv = kmalloc(sizeof(struct gfs2_revoke),

  					 GFP_NOFS | __GFP_NOFAIL);

  	lops_init_le(&rv->rv_le, &gfs2_revoke_lops);
  	rv->rv_blkno = blkno;
  	lops_add(sdp, &rv->rv_le);
  }

  void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno)

  {
  	struct gfs2_revoke *rv;
  	int found = 0;
  
  	gfs2_log_lock(sdp);
  
  	list_for_each_entry(rv, &sdp->sd_log_le_revoke, rv_le.le_list) {
  		if (rv->rv_blkno == blkno) {
  			list_del(&rv->rv_le.le_list);
  			gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
  			sdp->sd_log_num_revoke--;
  			found = 1;
  			break;
  		}
  	}
  
  	gfs2_log_unlock(sdp);
  
  	if (found) {

  		struct gfs2_trans *tr = current->journal_info;

  		kfree(rv);

  		tr->tr_num_revoke_rm++;

  	}
  }
  
  void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
  {
  	lops_add(rgd->rd_sbd, &rgd->rd_le);
  }