/*

   *   Copyright (C) International Business Machines Corp., 2000-2002
   *   Portions Copyright (C) Christoph Hellwig, 2001-2002

   *
   *   This program is free software;  you can redistribute it and/or modify
   *   it under the terms of the GNU General Public License as published by

   *   the Free Software Foundation; either version 2 of the License, or

   *   (at your option) any later version.

   *

   *   This program is distributed in the hope that it will be useful,
   *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
   *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
   *   the GNU General Public License for more details.
   *
   *   You should have received a copy of the GNU General Public License

   *   along with this program;  if not, write to the Free Software

   *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
   */

  #include <linux/mm.h>

  #include <linux/fs.h>

  #include <linux/quotaops.h>

  #include "jfs_incore.h"

  #include "jfs_inode.h"

  #include "jfs_dmap.h"
  #include "jfs_txnmgr.h"
  #include "jfs_xattr.h"
  #include "jfs_acl.h"
  #include "jfs_debug.h"

  int jfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)

  {

  	struct inode *inode = file->f_mapping->host;

  	int rc = 0;

  	rc = filemap_write_and_wait_range(inode->i_mapping, start, end);
  	if (rc)
  		return rc;
  
  	mutex_lock(&inode->i_mutex);

  	if (!(inode->i_state & I_DIRTY) ||
  	    (datasync && !(inode->i_state & I_DIRTY_DATASYNC))) {
  		/* Make sure committed changes hit the disk */
  		jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1);

  		mutex_unlock(&inode->i_mutex);

  		return rc;
  	}
  
  	rc |= jfs_commit_inode(inode, 1);

  	mutex_unlock(&inode->i_mutex);

  
  	return rc ? -EIO : 0;
  }
  
  static int jfs_open(struct inode *inode, struct file *file)
  {
  	int rc;

  	if ((rc = dquot_file_open(inode, file)))

  		return rc;
  
  	/*
  	 * We attempt to allow only one "active" file open per aggregate
  	 * group.  Otherwise, appending to files in parallel can cause
  	 * fragmentation within the files.
  	 *
  	 * If the file is empty, it was probably just created and going
  	 * to be written to.  If it has a size, we'll hold off until the
  	 * file is actually grown.
  	 */
  	if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE &&
  	    (inode->i_size == 0)) {
  		struct jfs_inode_info *ji = JFS_IP(inode);
  		spin_lock_irq(&ji->ag_lock);
  		if (ji->active_ag == -1) {

  			struct jfs_sb_info *jfs_sb = JFS_SBI(inode->i_sb);
  			ji->active_ag = BLKTOAG(addressPXD(&ji->ixpxd), jfs_sb);
  			atomic_inc( &jfs_sb->bmap->db_active[ji->active_ag]);

  		}
  		spin_unlock_irq(&ji->ag_lock);
  	}
  
  	return 0;
  }
  static int jfs_release(struct inode *inode, struct file *file)
  {
  	struct jfs_inode_info *ji = JFS_IP(inode);
  
  	spin_lock_irq(&ji->ag_lock);
  	if (ji->active_ag != -1) {
  		struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
  		atomic_dec(&bmap->db_active[ji->active_ag]);
  		ji->active_ag = -1;
  	}
  	spin_unlock_irq(&ji->ag_lock);
  
  	return 0;
  }

  int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
  {
  	struct inode *inode = dentry->d_inode;
  	int rc;
  
  	rc = inode_change_ok(inode, iattr);
  	if (rc)
  		return rc;

  	if (is_quota_modification(inode, iattr))

  		dquot_initialize(inode);

  	if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) ||
  	    (iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) {

  		rc = dquot_transfer(inode, iattr);
  		if (rc)
  			return rc;

  	}

  	if ((iattr->ia_valid & ATTR_SIZE) &&
  	    iattr->ia_size != i_size_read(inode)) {

  		inode_dio_wait(inode);

  		rc = vmtruncate(inode, iattr->ia_size);
  		if (rc)
  			return rc;
  	}

  	setattr_copy(inode, iattr);
  	mark_inode_dirty(inode);

  	if (iattr->ia_valid & ATTR_MODE)
  		rc = jfs_acl_chmod(inode);

  	return rc;
  }

  const struct inode_operations jfs_file_inode_operations = {

  	.truncate	= jfs_truncate,
  	.setxattr	= jfs_setxattr,
  	.getxattr	= jfs_getxattr,
  	.listxattr	= jfs_listxattr,
  	.removexattr	= jfs_removexattr,

  	.setattr	= jfs_setattr,

  #ifdef CONFIG_JFS_POSIX_ACL

  	.get_acl	= jfs_get_acl,

  #endif
  };

  const struct file_operations jfs_file_operations = {

  	.open		= jfs_open,
  	.llseek		= generic_file_llseek,

  	.write		= do_sync_write,
  	.read		= do_sync_read,

  	.aio_read	= generic_file_aio_read,
  	.aio_write	= generic_file_aio_write,
  	.mmap		= generic_file_mmap,

  	.splice_read	= generic_file_splice_read,
  	.splice_write	= generic_file_splice_write,

  	.fsync		= jfs_fsync,
  	.release	= jfs_release,

  	.unlocked_ioctl = jfs_ioctl,

  #ifdef CONFIG_COMPAT
  	.compat_ioctl	= jfs_compat_ioctl,
  #endif

  };