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f2fs: introduce f2fs_bmap_compress() 

to support bmap() on compressed inode: if queried block locates in
non-compressed cluster, return its physical block address.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2020-03-30 17:13:29 +08:00 committed by Jaegeuk Kim
parent bf38fbad12
commit c1c6338786
1 changed files with 34 additions and 0 deletions
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34
fs/f2fs/data.c
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@ -3666,6 +3666,37 @@ static int f2fs_set_data_page_dirty(struct page *page)
return 0;
}
static sector_t f2fs_bmap_compress(struct inode *inode, sector_t block)
{
#ifdef CONFIG_F2FS_FS_COMPRESSION
struct dnode_of_data dn;
sector_t start_idx, blknr = 0;
int ret;
start_idx = round_down(block, F2FS_I(inode)->i_cluster_size);
set_new_dnode(&dn, inode, NULL, NULL, 0);
ret = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
if (ret)
return 0;
if (dn.data_blkaddr != COMPRESS_ADDR) {
dn.ofs_in_node += block - start_idx;
blknr = f2fs_data_blkaddr(&dn);
if (!__is_valid_data_blkaddr(blknr))
blknr = 0;
}
f2fs_put_dnode(&dn);
return blknr;
#else
return -EOPNOTSUPP;
#endif
}
static sector_t f2fs_bmap(struct address_space *mapping, sector_t block)
{
struct inode *inode = mapping->host;
@ -3677,6 +3708,9 @@ static sector_t f2fs_bmap(struct address_space *mapping, sector_t block)
if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
filemap_write_and_wait(mapping);
if (f2fs_compressed_file(inode))
return f2fs_bmap_compress(inode, block);
return generic_block_bmap(mapping, block, get_data_block_bmap);
}