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staging: erofs: support bmap

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

Reviewed-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Link: https://lore.kernel.org/r/20190716093256.108791-1-yuchao0@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chao Yu 2019-07-16 17:32:56 +08:00 committed by Greg Kroah-Hartman
parent 441dfcc886
commit 9da681e017
1 changed files with 33 additions and 0 deletions
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33
drivers/staging/erofs/data.c
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@ -392,9 +392,42 @@ static int erofs_raw_access_readpages(struct file *filp,
return 0; 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 */ /* for uncompressed (aligned) files and raw access for other files */
const struct address_space_operations erofs_raw_access_aops = { const struct address_space_operations erofs_raw_access_aops = {
.readpage = erofs_raw_access_readpage, .readpage = erofs_raw_access_readpage,
.readpages = erofs_raw_access_readpages, .readpages = erofs_raw_access_readpages,
.bmap = erofs_bmap,
}; };