<commit_before>/*
 *  linux/fs/ext4/file.c
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * <NAME> (<EMAIL>)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Mar<NAME> (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/file.c
 *
 *  Copyright (C) 1991, 1992  <NAME>
 *
 *  ext4 fs regular file handling primitives
 *
 *  64-bit file support on 64-bit platforms by <NAME>
 *	(<EMAIL>)
 */

#include <linux/time.h>
#include <linux/fs.h>
#include <linux/jbd2.h>
#include <linux/mount.h>
#include <linux/path.h>
#include <linux/aio.h>
#include <linux/quotaops.h>
#include <linux/pagevec.h>
#include "ext4.h"
#include "ext4_jbd2.h"
#include "xattr.h"
#include "acl.h"

/*
 * Called when an inode is released. Note that this is different
 * from ext4_file_open: open gets called at every open, but release
 * gets called only when /all/ the files are closed.
 */
static int ext4_release_file(struct inode *inode, struct file *filp)
{
	if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) {
		ext4_alloc_da_blocks(inode);
		ext4_clear_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE);
	}
	/* 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) &&
		        !EXT4_I(inode)->i_reserved_data_blocks)
	{
		down_write(&EXT4_I(inode)->i_data_sem);
		ext4_discard_preallocations(inode);
		up_write(&EXT4_I(inode)->i_data_sem);
	}
	if (is_dx(inode) && filp->private_data)
		ext4_htree_free_dir_info(filp->private_data);

	return 0;
}

void ext4_unwritten_wait(struct inode *inode)
{
	wait_queue_head_t *wq = ext4_ioend_wq(inode);

	wait_event(*wq, (atomic_read(&EXT4_I(inode)->i_unwritten) == 0));
}

/*
 * This tests whether the IO in question is block-aligned or not.
 * Ext4 utilizes unwritten extents when hole-filling during direct IO, and they
 * are converted to written only after the IO is complete.  Until they are
 * mapped, these blocks appear as holes, so dio_zero_block() will assume that
 * it needs to zero out portions of the start and/or end block.  If 2 AIO
 * threads are at work on the same unwritten block, they must be synchronized
 * or one thread will zero the other's data, causing corruption.
 */
static int
ext4_unaligned_aio(struct inode *inode, const struct iovec *iov,
		   unsigned long nr_segs, loff_t pos)
{
	struct super_block *sb = inode->i_sb;
	int blockmask = sb->s_blocksize - 1;
	size_t count = iov_length(iov, nr_segs);
	loff_t final_size = pos + count;

	if (pos >= i_size_read(inode))
		return 0;

	if ((pos & blockmask) || (final_size & blockmask))
		return 1;

	return 0;
}

static ssize_t
ext4_file_dio_write(struct kiocb *iocb, const struct iovec *iov,
		    unsigned long nr_segs, loff_t pos)
{
	struct file *file = iocb->ki_filp;
	struct inode *inode = file->f_mapping->host;
	struct blk_plug plug;
	int unaligned_aio = 0;
	ssize_t ret;
	int overwrite = 0;
	size_t length = iov_length(iov, nr_segs);

	if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) &&
	    !is_sync_kiocb(iocb))
		unaligned_aio = ext4_unaligned_aio(inode, iov, nr_segs, pos);

	/* Unaligned direct AIO must be serialized; see comment above */
	if (unaligned_aio) {
		mutex_lock(ext4_aio_mutex(inode));
		ext4_unwritten_wait(inode);
	}

	mutex_lock(&inode->i_mutex);
	blk_start_plug(&plug);

	iocb->private = &overwrite;

	/* check whether we do a DIO overwrite or not */
	if (ext4_should_dioread_nolock(inode) && !unaligned_aio &&
	    !file->f_mapping->nrpages && pos + length <= i_size_read(inode)) {
		struct ext4_map_blocks map;
		unsigned int blkbits = inode->i_blkbits;
		int err, len;

		map.m_lblk = pos >> blkbits;
		map.m_len = (EXT4_BLOCK_ALIGN(pos + length, blkbits) >> blkbits)
			- map.m_lblk;
		len = map.m_len;

		err = ext4_map_blocks(NULL, inode, &map, 0);
		/*
		 * 'err==len' means that all of blocks has been preallocated no
		 * matter they are initialized or not.  For excluding
		 * unwritten extents, we need to check m_flags.  There are
		 * two conditions that indicate for initialized extents.
		 * 1) If we hit extent cache, EXT4_MAP_MAPPED flag is returned;
		 * 2) If we do a real lookup, non-flags are returned.
		 * So we should check these two conditions.
		 */
		if (err == len && (map.m_flags & EXT4_MAP_MAPPED))
			overwrite = 1;
	}

	ret = __generic_file_aio_write(iocb, iov, nr_segs);
	mutex_unlock(&inode->i_mutex);

	if (ret > 0) {
		ssize_t err;

		err = generic_write_sync(file, iocb->ki_pos - ret, ret);
		if (err < 0)
			ret = err;
	}
	blk_finish_plug(&plug);

	if (unaligned_aio)
		mutex_unlock(ext4_aio_mutex(inode));

	return ret;
}

static ssize_t
ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
		unsigned long nr_segs, loff_t pos)
{
	struct file *file = iocb->ki_filp;
	struct inode *inode = file_inode(iocb->ki_filp);
	ssize_t ret;

	BUG_ON(iocb->ki_pos != pos);

	/*
	 * If we have encountered a bitmap-format file, the size limit
	 * is smaller than s_maxbytes, which is for extent-mapped files.
	 */

	if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
		struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
		size_t length = iov_length(iov, nr_segs);

		if ((pos > sbi->s_bitmap_maxbytes ||
		    (pos == sbi->s_bitmap_maxbytes && length > 0)))
			return -EFBIG;

		if (pos + length > sbi->s_bitmap_maxbytes) {
			nr_segs = iov_shorten((struct iovec *)iov, nr_segs,
					      sbi->s_bitmap_maxbytes - pos);
		}
	}

	if (unlikely(iocb->ki_filp->f_flags & O_DIRECT))
		ret = ext4_file_dio_write(iocb, iov, nr_segs, pos);
	else {
		mutex_lock(&inode->i_mutex);
		ret = __generic_file_aio_write(iocb, iov, nr_segs);
		mutex_unlock(&inode->i_mutex);

		if (ret > 0) {
			ssize_t err;

			err = generic_write_sync(file, iocb->ki_pos - ret, ret);
			if (err < 0)
				ret = err;
		}
	}

	return ret;
}

static const struct vm_operations_struct ext4_file_vm_ops = {
	.fault		= filemap_fault,
	.map_pages	= filemap_map_pages,
	.page_mkwrite   = ext4_page_mkwrite,
	.remap_pages	= generic_file_remap_pages,
};

static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct address_space *mapping = file->f_mapping;

	if (!mapping->a_ops->readpage)<commit_msg>ext4: move ext4_file_dio_write() into ext4_file_write()<commit_after>/*
 *  linux/fs/ext4/file.c
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * <NAME> (<EMAIL>)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/file.c
 *
 *  Copyright (C) 1991, 1992  <NAME>
 *
 *  ext4 fs regular file handling primitives
 *
 *  64-bit file support on 64-bit platforms by <NAME>
 *	(<EMAIL>)
 */

#include <linux/time.h>
#include <linux/fs.h>
#include <linux/jbd2.h>
#include <linux/mount.h>
#include <linux/path.h>
#include <linux/aio.h>
#include <linux/quotaops.h>
#include <linux/pagevec.h>
#include "ext4.h"
#include "ext4_jbd2.h"
#include "xattr.h"
#include "acl.h"

/*
 * Called when an inode is released. Note that this is different
 * from ext4_file_open: open gets called at every open, but release
 * gets called only when /all/ the files are closed.
 */
static int ext4_release_file(struct inode *inode, struct file *filp)
{
	if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) {
		ext4_alloc_da_blocks(inode);
		ext4_clear_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE);
	}
	/* 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) &&
		        !EXT4_I(inode)->i_reserved_data_blocks)
	{
		down_write(&EXT4_I(inode)->i_data_sem);
		ext4_discard_preallocations(inode);
		up_write(&EXT4_I(inode)->i_data_sem);
	}
	if (is_dx(inode) && filp->private_data)
		ext4_htree_free_dir_info(filp->private_data);

	return 0;
}

void ext4_unwritten_wait(struct inode *inode)
{
	wait_queue_head_t *wq = ext4_ioend_wq(inode);

	wait_event(*wq, (atomic_read(&EXT4_I(inode)->i_unwritten) == 0));
}

/*
 * This tests whether the IO in question is block-aligned or not.
 * Ext4 utilizes unwritten extents when hole-filling during direct IO, and they
 * are converted to written only after the IO is complete.  Until they are
 * mapped, these blocks appear as holes, so dio_zero_block() will assume that
 * it needs to zero out portions of the start and/or end block.  If 2 AIO
 * threads are at work on the same unwritten block, they must be synchronized
 * or one thread will zero the other's data, causing corruption.
 */
static int
ext4_unaligned_aio(struct inode *inode, const struct iovec *iov,
		   unsigned long nr_segs, loff_t pos)
{
	struct super_block *sb = inode->i_sb;
	int blockmask = sb->s_blocksize - 1;
	size_t count = iov_length(iov, nr_segs);
	loff_t final_size = pos + count;

	if (pos >= i_size_read(inode))
		return 0;

	if ((pos & blockmask) || (final_size & blockmask))
		return 1;

	return 0;
}

static ssize_t
ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
		unsigned long nr_segs, loff_t pos)
{
	struct file *file = iocb->ki_filp;
	struct inode *inode = file_inode(iocb->ki_filp);
	struct blk_plug plug;
	int unaligned_aio = 0;
	int overwrite = 0;
	size_t length = iov_length(iov, nr_segs);
	ssize_t ret;

	BUG_ON(iocb->ki_pos != pos);

	/*
	 * If we have encountered a bitmap-format file, the size limit
	 * is smaller than s_maxbytes, which is for extent-mapped files.
	 */

	if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
		struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);

		if ((pos > sbi->s_bitmap_maxbytes ||
		    (pos == sbi->s_bitmap_maxbytes && length > 0)))
			return -EFBIG;

		if (pos + length > sbi->s_bitmap_maxbytes) {
			nr_segs = iov_shorten((struct iovec *)iov, nr_segs,
					      sbi->s_bitmap_maxbytes - pos);
		}
	}

	if (unlikely(iocb->ki_filp->f_flags & O_DIRECT)) {
		if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) &&
		    !is_sync_kiocb(iocb))
			unaligned_aio = ext4_unaligned_aio(inode, iov,
							   nr_segs, pos);

		/* Unaligned direct AIO must be serialized; see comment above */
		if (unaligned_aio) {
			mutex_lock(ext4_aio_mutex(inode));
			ext4_unwritten_wait(inode);
		}

		mutex_lock(&inode->i_mutex);
		blk_start_plug(&plug);

		iocb->private = &overwrite;

		/* check whether we do a DIO overwrite or not */
		if (ext4_should_dioread_nolock(inode) && !unaligned_aio &&
		    !file->f_mapping->nrpages && pos + length <= i_size_read(inode)) {
			struct ext4_map_blocks map;
			unsigned int blkbits = inode->i_blkbits;
			int err, len;

			map.m_lblk = pos >> blkbits;
			map.m_len = (EXT4_BLOCK_ALIGN(pos + length, blkbits) >> blkbits)
				- map.m_lblk;
			len = map.m_len;

			err = ext4_map_blocks(NULL, inode, &map, 0);
			/*
			 * 'err==len' means that all of blocks has
			 * been preallocated no matter they are
			 * initialized or not.  For excluding
			 * unwritten extents, we need to check
			 * m_flags.  There are two conditions that
			 * indicate for initialized extents.  1) If we
			 * hit extent cache, EXT4_MAP_MAPPED flag is
			 * returned; 2) If we do a real lookup,
			 * non-flags are returned.  So we should check
			 * these two conditions.
			 */
			if (err == len && (map.m_flags & EXT4_MAP_MAPPED))
				overwrite = 1;
		}

		ret = __generic_file_aio_write(iocb, iov, nr_segs);
		mutex_unlock(&inode->i_mutex);

		if (ret > 0) {
			ssize_t err;

			err = generic_write_sync(file, iocb->ki_pos - ret, ret);
			if (err < 0)
				ret = err;
		}
		blk_finish_plug(&plug);

		if (unaligned_aio)
			mutex_unlock(ext4_aio_mutex(inode));
	} else {
		mutex_lock(&inode->i_mutex);
		ret = __generic_file_aio_write(iocb, iov, nr_segs);
		mutex_unlock(&inode->i_mutex);

		if (ret > 0) {
			ssize_t err;

			err = generic_write_sync(file, iocb->ki_pos - ret, ret);
			if (err < 0)
				ret = err;
		}
	}

	return ret;
}

static const struct vm_operations_struct ext4_file_vm_ops = {
	.fault		= filemap_fault,
	.map_pages	= filemap_map_pages,
	.page_mkwrite   = ext4_page_mkwrite,
	.remap_pages	= generic_file_remap_pages,
};

static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct address_space *mapping = file->f_mapping;

	if (!mapping->a_ops->readpage)
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