示例#1
0
blk64_t ext2fs_find_inode_goal(ext2_filsys fs, ext2_ino_t ino,
			       struct ext2_inode *inode, blk64_t lblk)
{
	dgrp_t			group;
	__u8			log_flex;
	struct ext2fs_extent	extent;
	ext2_extent_handle_t	handle = NULL;
	errcode_t		err;

	if (inode == NULL || ext2fs_inode_data_blocks2(fs, inode) == 0)
		goto no_blocks;

	if (inode->i_flags & EXT4_INLINE_DATA_FL)
		goto no_blocks;

	if (inode->i_flags & EXT4_EXTENTS_FL) {
		err = ext2fs_extent_open2(fs, ino, inode, &handle);
		if (err)
			goto no_blocks;
		err = ext2fs_extent_goto2(handle, 0, lblk);
		if (err)
			goto no_blocks;
		err = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT, &extent);
		if (err)
			goto no_blocks;
		ext2fs_extent_free(handle);
		return extent.e_pblk + (lblk - extent.e_lblk);
	}

	/* block mapped file; see if block zero is mapped? */
	if (inode->i_block[0])
		return inode->i_block[0];

no_blocks:
	ext2fs_extent_free(handle);
	log_flex = fs->super->s_log_groups_per_flex;
	group = ext2fs_group_of_ino(fs, ino);
	if (log_flex)
		group = group & ~((1 << (log_flex)) - 1);
	return ext2fs_group_first_block2(fs, group);
}
示例#2
0
文件: extent.c 项目: haie1011/nofs
extern errcode_t ext2fs_extent_open(ext2_filsys fs, ext2_ino_t ino,
				    ext2_extent_handle_t *ret_handle)
{
	return ext2fs_extent_open2(fs, ino, NULL, ret_handle);
}
示例#3
0
static errcode_t mk_hugefile(ext2_filsys fs, blk64_t num,
			     ext2_ino_t dir, unsigned long idx, ext2_ino_t *ino)

{
	errcode_t		retval;
	blk64_t			lblk, bend = 0;
	__u64			size;
	blk64_t			left;
	blk64_t			count = 0;
	struct ext2_inode	inode;
	ext2_extent_handle_t	handle;

	retval = ext2fs_new_inode(fs, 0, LINUX_S_IFREG, NULL, ino);
	if (retval)
		return retval;

	memset(&inode, 0, sizeof(struct ext2_inode));
	inode.i_mode = LINUX_S_IFREG | (0666 & ~fs->umask);
	inode.i_links_count = 1;
	inode.i_uid = uid & 0xFFFF;
	ext2fs_set_i_uid_high(inode, (uid >> 16) & 0xffff);
	inode.i_gid = gid & 0xFFFF;
	ext2fs_set_i_gid_high(inode, (gid >> 16) & 0xffff);

	retval = ext2fs_write_new_inode(fs, *ino, &inode);
	if (retval)
		return retval;

	ext2fs_inode_alloc_stats2(fs, *ino, +1, 0);

	retval = ext2fs_extent_open2(fs, *ino, &inode, &handle);
	if (retval)
		return retval;

	/*
	 * We don't use ext2fs_fallocate() here because hugefiles are
	 * designed to be physically contiguous (if the block group
	 * descriptors are configured to be in a single block at the
	 * beginning of the file system, by using the
	 * packed_meta_blocks layout), with the extent tree blocks
	 * allocated near the beginning of the file system.
	 */
	lblk = 0;
	left = num ? num : 1;
	while (left) {
		blk64_t pblk, end;
		blk64_t n = left;

		retval =  ext2fs_find_first_zero_block_bitmap2(fs->block_map,
			goal, ext2fs_blocks_count(fs->super) - 1, &end);
		if (retval)
			goto errout;
		goal = end;

		retval =  ext2fs_find_first_set_block_bitmap2(fs->block_map, goal,
			       ext2fs_blocks_count(fs->super) - 1, &bend);
		if (retval == ENOENT) {
			bend = ext2fs_blocks_count(fs->super);
			if (num == 0)
				left = 0;
		}
		if (!num || bend - goal < left)
			n = bend - goal;
		pblk = goal;
		if (num)
			left -= n;
		goal += n;
		count += n;
		ext2fs_block_alloc_stats_range(fs, pblk, n, +1);

		if (zero_hugefile) {
			blk64_t ret_blk;
			retval = ext2fs_zero_blocks2(fs, pblk, n,
						     &ret_blk, NULL);

			if (retval)
				com_err(program_name, retval,
					_("while zeroing block %llu "
					  "for hugefile"), ret_blk);
		}

		while (n) {
			blk64_t l = n;
			struct ext2fs_extent newextent;

			if (l > EXT_INIT_MAX_LEN)
				l = EXT_INIT_MAX_LEN;

			newextent.e_len = l;
			newextent.e_pblk = pblk;
			newextent.e_lblk = lblk;
			newextent.e_flags = 0;

			retval = ext2fs_extent_insert(handle,
					EXT2_EXTENT_INSERT_AFTER, &newextent);
			if (retval)
				return retval;
			pblk += l;
			lblk += l;
			n -= l;
		}
	}

	retval = ext2fs_read_inode(fs, *ino, &inode);
	if (retval)
		goto errout;

	retval = ext2fs_iblk_add_blocks(fs, &inode,
					count / EXT2FS_CLUSTER_RATIO(fs));
	if (retval)
		goto errout;
	size = (__u64) count * fs->blocksize;
	retval = ext2fs_inode_size_set(fs, &inode, size);
	if (retval)
		goto errout;

	retval = ext2fs_write_new_inode(fs, *ino, &inode);
	if (retval)
		goto errout;

	if (idx_digits)
		sprintf(fn_numbuf, "%0*lu", idx_digits, idx);
	else if (num_files > 1)
		sprintf(fn_numbuf, "%lu", idx);

retry:
	retval = ext2fs_link(fs, dir, fn_buf, *ino, EXT2_FT_REG_FILE);
	if (retval == EXT2_ET_DIR_NO_SPACE) {
		retval = ext2fs_expand_dir(fs, dir);
		if (retval)
			goto errout;
		goto retry;
	}

	if (retval)
		goto errout;

errout:
	if (handle)
		ext2fs_extent_free(handle);

	return retval;
}
errcode_t ext2fs_mkdir(ext2_filsys fs, ext2_ino_t parent, ext2_ino_t inum,
		       const char *name)
{
	ext2_extent_handle_t	handle;
	errcode_t		retval;
	struct ext2_inode	parent_inode, inode;
	ext2_ino_t		ino = inum;
	ext2_ino_t		scratch_ino;
	blk64_t			blk;
	char			*block = 0;

	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

	/*
	 * Allocate an inode, if necessary
	 */
	if (!ino) {
		retval = ext2fs_new_inode(fs, parent, LINUX_S_IFDIR | 0755,
					  0, &ino);
		if (retval)
			goto cleanup;
	}

	/*
	 * Allocate a data block for the directory
	 */
	retval = ext2fs_new_block2(fs, 0, 0, &blk);
	if (retval)
		goto cleanup;

	/*
	 * Create a scratch template for the directory
	 */
	retval = ext2fs_new_dir_block(fs, ino, parent, &block);
	if (retval)
		goto cleanup;

	/*
	 * Get the parent's inode, if necessary
	 */
	if (parent != ino) {
		retval = ext2fs_read_inode(fs, parent, &parent_inode);
		if (retval)
			goto cleanup;
	} else
		memset(&parent_inode, 0, sizeof(parent_inode));

	/*
	 * Create the inode structure....
	 */
	memset(&inode, 0, sizeof(struct ext2_inode));
	inode.i_mode = LINUX_S_IFDIR | (0777 & ~fs->umask);
	inode.i_uid = inode.i_gid = 0;
	ext2fs_iblk_set(fs, &inode, 1);
	if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS)
		inode.i_flags |= EXT4_EXTENTS_FL;
	else
		inode.i_block[0] = blk;
	inode.i_links_count = 2;
	inode.i_size = fs->blocksize;

	/*
	 * Write out the inode and inode data block
	 */
	retval = ext2fs_write_dir_block(fs, blk, block);
	if (retval)
		goto cleanup;
	retval = ext2fs_write_new_inode(fs, ino, &inode);
	if (retval)
		goto cleanup;

	if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS) {
		retval = ext2fs_extent_open2(fs, ino, &inode, &handle);
		if (retval)
			goto cleanup;
		retval = ext2fs_extent_set_bmap(handle, 0, blk, 0);
		ext2fs_extent_free(handle);
		if (retval)
			goto cleanup;
	}

	/*
	 * Link the directory into the filesystem hierarchy
	 */
	if (name) {
		retval = ext2fs_lookup(fs, parent, name, strlen(name), 0,
				       &scratch_ino);
		if (!retval) {
			retval = EXT2_ET_DIR_EXISTS;
			name = 0;
			goto cleanup;
		}
		if (retval != EXT2_ET_FILE_NOT_FOUND)
			goto cleanup;
		retval = ext2fs_link(fs, parent, name, ino, EXT2_FT_DIR);
		if (retval)
			goto cleanup;
	}

	/*
	 * Update parent inode's counts
	 */
	if (parent != ino) {
		parent_inode.i_links_count++;
		retval = ext2fs_write_inode(fs, parent, &parent_inode);
		if (retval)
			goto cleanup;
	}

	/*
	 * Update accounting....
	 */
	ext2fs_block_alloc_stats2(fs, blk, +1);
	ext2fs_inode_alloc_stats2(fs, ino, +1, 1);

cleanup:
	if (block)
		ext2fs_free_mem(&block);
	return retval;

}