[net-next-2.6.git] / fs / ext3 / file.c

/*
 *  linux/fs/ext3/file.c
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/file.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  ext3 fs regular file handling primitives
 *
 *  64-bit file support on 64-bit platforms by Jakub Jelinek
 *	(jj@sunsite.ms.mff.cuni.cz)
 */

#include <linux/time.h>
#include <linux/fs.h>
#include <linux/jbd.h>
#include <linux/ext3_fs.h>
#include <linux/ext3_jbd.h>
#include "xattr.h"
#include "acl.h"

/*
 * Called when an inode is released. Note that this is different
 * from ext3_file_open: open gets called at every open, but release
 * gets called only when /all/ the files are closed.
 */
static int ext3_release_file (struct inode * inode, struct file * filp)
{
	/* if we are the last writer on the inode, drop the block reservation */
	if ((filp->f_mode & FMODE_WRITE) &&
			(atomic_read(&inode->i_writecount) == 1))
	{
		down(&EXT3_I(inode)->truncate_sem);
		ext3_discard_reservation(inode);
		up(&EXT3_I(inode)->truncate_sem);
	}
	if (is_dx(inode) && filp->private_data)
		ext3_htree_free_dir_info(filp->private_data);

	return 0;
}

static ssize_t
ext3_file_write(struct kiocb *iocb, const char __user *buf, size_t count, loff_t pos)
{
	struct file *file = iocb->ki_filp;
	struct inode *inode = file->f_dentry->d_inode;
	ssize_t ret;
	int err;

	ret = generic_file_aio_write(iocb, buf, count, pos);

	/*
	 * Skip flushing if there was an error, or if nothing was written.
	 */
	if (ret <= 0)
		return ret;

	/*
	 * If the inode is IS_SYNC, or is O_SYNC and we are doing data
	 * journalling then we need to make sure that we force the transaction
	 * to disk to keep all metadata uptodate synchronously.
	 */
	if (file->f_flags & O_SYNC) {
		/*
		 * If we are non-data-journaled, then the dirty data has
		 * already been flushed to backing store by generic_osync_inode,
		 * and the inode has been flushed too if there have been any
		 * modifications other than mere timestamp updates.
		 *
		 * Open question --- do we care about flushing timestamps too
		 * if the inode is IS_SYNC?
		 */
		if (!ext3_should_journal_data(inode))
			return ret;

		goto force_commit;
	}

	/*
	 * So we know that there has been no forced data flush.  If the inode
	 * is marked IS_SYNC, we need to force one ourselves.
	 */
	if (!IS_SYNC(inode))
		return ret;

	/*
	 * Open question #2 --- should we force data to disk here too?  If we
	 * don't, the only impact is that data=writeback filesystems won't
	 * flush data to disk automatically on IS_SYNC, only metadata (but
	 * historically, that is what ext2 has done.)
	 */

force_commit:
	err = ext3_force_commit(inode->i_sb);
	if (err) 
		return err;
	return ret;
}

struct file_operations ext3_file_operations = {
	.llseek		= generic_file_llseek,
	.read		= do_sync_read,
	.write		= do_sync_write,
	.aio_read	= generic_file_aio_read,
	.aio_write	= ext3_file_write,
	.readv		= generic_file_readv,
	.writev		= generic_file_writev,
	.ioctl		= ext3_ioctl,
	.mmap		= generic_file_mmap,
	.open		= generic_file_open,
	.release	= ext3_release_file,
	.fsync		= ext3_sync_file,
	.sendfile	= generic_file_sendfile,
};

struct inode_operations ext3_file_inode_operations = {
	.truncate	= ext3_truncate,
	.setattr	= ext3_setattr,
#ifdef CONFIG_EXT3_FS_XATTR
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.listxattr	= ext3_listxattr,
	.removexattr	= generic_removexattr,
#endif
	.permission	= ext3_permission,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/ext3/file.c
	3	*
	4	* Copyright (C) 1992, 1993, 1994, 1995
	5	* Remy Card (card@masi.ibp.fr)
	6	* Laboratoire MASI - Institut Blaise Pascal
	7	* Universite Pierre et Marie Curie (Paris VI)
	8	*
	9	* from
	10	*
	11	* linux/fs/minix/file.c
	12	*
	13	* Copyright (C) 1991, 1992 Linus Torvalds
	14	*
	15	* ext3 fs regular file handling primitives
	16	*
	17	* 64-bit file support on 64-bit platforms by Jakub Jelinek
	18	* (jj@sunsite.ms.mff.cuni.cz)
	19	*/
	20
	21	#include <linux/time.h>
	22	#include <linux/fs.h>
	23	#include <linux/jbd.h>
	24	#include <linux/ext3_fs.h>
	25	#include <linux/ext3_jbd.h>
	26	#include "xattr.h"
	27	#include "acl.h"
	28
	29	/*
	30	* Called when an inode is released. Note that this is different
	31	* from ext3_file_open: open gets called at every open, but release
	32	* gets called only when /all/ the files are closed.
	33	*/
	34	static int ext3_release_file (struct inode * inode, struct file * filp)
	35	{
	36	/* if we are the last writer on the inode, drop the block reservation */
	37	if ((filp->f_mode & FMODE_WRITE) &&
	38	(atomic_read(&inode->i_writecount) == 1))
21fe3471 MC	39	{
21fe3471 MC	40	down(&EXT3_I(inode)->truncate_sem);
1da177e4	41	ext3_discard_reservation(inode);
21fe3471 MC	42	up(&EXT3_I(inode)->truncate_sem);
21fe3471 MC	43	}
1da177e4 LT	44	if (is_dx(inode) && filp->private_data)
	45	ext3_htree_free_dir_info(filp->private_data);
	46
	47	return 0;
	48	}
	49
	50	static ssize_t
	51	ext3_file_write(struct kiocb iocb, const char __user buf, size_t count, loff_t pos)
	52	{
	53	struct file *file = iocb->ki_filp;
	54	struct inode *inode = file->f_dentry->d_inode;
	55	ssize_t ret;
	56	int err;
	57
	58	ret = generic_file_aio_write(iocb, buf, count, pos);
	59
	60	/*
	61	* Skip flushing if there was an error, or if nothing was written.
	62	*/
	63	if (ret <= 0)
	64	return ret;
	65
	66	/*
	67	* If the inode is IS_SYNC, or is O_SYNC and we are doing data
	68	* journalling then we need to make sure that we force the transaction
	69	* to disk to keep all metadata uptodate synchronously.
	70	*/
	71	if (file->f_flags & O_SYNC) {
	72	/*
	73	* If we are non-data-journaled, then the dirty data has
	74	* already been flushed to backing store by generic_osync_inode,
	75	* and the inode has been flushed too if there have been any
	76	* modifications other than mere timestamp updates.
	77	*
	78	* Open question --- do we care about flushing timestamps too
	79	* if the inode is IS_SYNC?
	80	*/
	81	if (!ext3_should_journal_data(inode))
	82	return ret;
	83
	84	goto force_commit;
	85	}
	86
	87	/*
	88	* So we know that there has been no forced data flush. If the inode
	89	* is marked IS_SYNC, we need to force one ourselves.
	90	*/
	91	if (!IS_SYNC(inode))
	92	return ret;
	93
	94	/*
	95	* Open question #2 --- should we force data to disk here too? If we
	96	* don't, the only impact is that data=writeback filesystems won't
	97	* flush data to disk automatically on IS_SYNC, only metadata (but
	98	* historically, that is what ext2 has done.)
	99	*/
	100
	101	force_commit:
	102	err = ext3_force_commit(inode->i_sb);
	103	if (err)
	104	return err;
	105	return ret;
	106	}
	107
108	struct file_operations ext3_file_operations = {
109	.llseek = generic_file_llseek,
110	.read = do_sync_read,
111	.write = do_sync_write,
112	.aio_read = generic_file_aio_read,
113	.aio_write = ext3_file_write,
114	.readv = generic_file_readv,
115	.writev = generic_file_writev,
116	.ioctl = ext3_ioctl,
117	.mmap = generic_file_mmap,
118	.open = generic_file_open,
119	.release = ext3_release_file,
120	.fsync = ext3_sync_file,
121	.sendfile = generic_file_sendfile,
122	};
123
124	struct inode_operations ext3_file_inode_operations = {
125	.truncate = ext3_truncate,
126	.setattr = ext3_setattr,
127	#ifdef CONFIG_EXT3_FS_XATTR
128	.setxattr = generic_setxattr,
129	.getxattr = generic_getxattr,
130	.listxattr = ext3_listxattr,
131	.removexattr = generic_removexattr,
132	#endif
133	.permission = ext3_permission,
134	};
135