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Commit 9da681e0 authored by Chao Yu's avatar Chao Yu Committed by Greg Kroah-Hartman
Browse files

staging: erofs: support bmap 



Add erofs_bmap() to support FIBMAP ioctl on flatmode inode.

Reviewed-by: default avatarGao Xiang <gaoxiang25@huawei.com>
Signed-off-by: default avatarChao Yu <yuchao0@huawei.com>
Link: https://lore.kernel.org/r/20190716093256.108791-1-yuchao0@huawei.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 441dfcc8

drivers/staging/erofs/data.c

+33 −0
Original line number Diff line number Diff line
@@ -392,9 +392,42 @@ static int erofs_raw_access_readpages(struct file *filp, 
	return 0;

}



static int erofs_get_block(struct inode *inode, sector_t iblock,

			   struct buffer_head *bh, int create)

{

	struct erofs_map_blocks map = {

		.m_la = iblock << 9,

	};

	int err;



	err = erofs_map_blocks(inode, &map, EROFS_GET_BLOCKS_RAW);

	if (err)

		return err;



	if (map.m_flags & EROFS_MAP_MAPPED)

		bh->b_blocknr = erofs_blknr(map.m_pa);



	return err;

}



static sector_t erofs_bmap(struct address_space *mapping, sector_t block)

{

	struct inode *inode = mapping->host;



	if (is_inode_flat_inline(inode)) {

		erofs_blk_t blks = i_size_read(inode) >> LOG_BLOCK_SIZE;



		if (block >> LOG_SECTORS_PER_BLOCK >= blks)

			return 0;

	}



	return generic_block_bmap(mapping, block, erofs_get_block);

}



/* for uncompressed (aligned) files and raw access for other files */

const struct address_space_operations erofs_raw_access_aops = {

	.readpage = erofs_raw_access_readpage,

	.readpages = erofs_raw_access_readpages,

	.bmap = erofs_bmap,

};