Ejemplos de nilfs_mdt_submit_block en C++ (Cpp)

Ejemplo n.º 1

Archivo: mdt.c Proyecto: AK101111/linux

static int nilfs_mdt_read_block(struct inode *inode, unsigned long block,
				int readahead, struct buffer_head **out_bh)
{
	struct buffer_head *first_bh, *bh;
	unsigned long blkoff;
	int i, nr_ra_blocks = NILFS_MDT_MAX_RA_BLOCKS;
	int err;

	err = nilfs_mdt_submit_block(inode, block, REQ_OP_READ, 0, &first_bh);
	if (err == -EEXIST) /* internal code */
		goto out;

	if (unlikely(err))
		goto failed;

	if (readahead) {
		blkoff = block + 1;
		for (i = 0; i < nr_ra_blocks; i++, blkoff++) {
			err = nilfs_mdt_submit_block(inode, blkoff, REQ_OP_READ,
						     REQ_RAHEAD, &bh);
			if (likely(!err || err == -EEXIST))
				brelse(bh);
			else if (err != -EBUSY)
				break;
				/* abort readahead if bmap lookup failed */
			if (!buffer_locked(first_bh))
				goto out_no_wait;
		}
	}

	wait_on_buffer(first_bh);

 out_no_wait:
	err = -EIO;
	if (!buffer_uptodate(first_bh)) {
		nilfs_msg(inode->i_sb, KERN_ERR,
			  "I/O error reading meta-data file (ino=%lu, block-offset=%lu)",
			  inode->i_ino, block);
		goto failed_bh;
	}
 out:
	*out_bh = first_bh;
	return 0;

 failed_bh:
	brelse(first_bh);
 failed:
	return err;
}

Ejemplo n.º 2

Archivo: mdt.c Proyecto: Herysutrisno/mpc5200

static int nilfs_mdt_read_block(struct inode *inode, unsigned long block,
				struct buffer_head **out_bh)
{
	struct buffer_head *first_bh, *bh;
	unsigned long blkoff;
	int i, nr_ra_blocks = NILFS_MDT_MAX_RA_BLOCKS;
	int err;

	err = nilfs_mdt_submit_block(inode, block, READ, &first_bh);
	if (err == -EEXIST) /* internal code */
		goto out;

	if (unlikely(err))
		goto failed;

	blkoff = block + 1;
	for (i = 0; i < nr_ra_blocks; i++, blkoff++) {
		err = nilfs_mdt_submit_block(inode, blkoff, READA, &bh);
		if (likely(!err || err == -EEXIST))
			brelse(bh);
		else if (err != -EBUSY)
			break; /* abort readahead if bmap lookup failed */

		if (!buffer_locked(first_bh))
			goto out_no_wait;
	}

	wait_on_buffer(first_bh);

 out_no_wait:
	err = -EIO;
	if (!buffer_uptodate(first_bh))
		goto failed_bh;
 out:
	*out_bh = first_bh;
	return 0;

 failed_bh:
	brelse(first_bh);
 failed:
	return err;
}