/*
* Will look for holes and unwritten extents in the range starting at
* pos for count bytes (inclusive).
*/
static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos,
size_t count)
{
int ret = 0;
unsigned int extent_flags;
u32 cpos, clusters, extent_len, phys_cpos;
struct super_block *sb = inode->i_sb;
cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
while (clusters) {
ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
&extent_flags);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
ret = 1;
break;
}
if (extent_len > clusters)
extent_len = clusters;
clusters -= extent_len;
cpos += extent_len;
}
out:
return ret;
}
errcode_t ocfs2_extent_map_get_blocks(ocfs2_cached_inode *cinode,
uint64_t v_blkno, int count,
uint64_t *p_blkno, uint64_t *ret_count,
uint16_t *extent_flags)
{
errcode_t ret;
int bpc;
uint32_t cpos, num_clusters = -1, p_cluster = -1;
uint64_t boff = 0;
ocfs2_filesys *fs = cinode->ci_fs;
bpc = ocfs2_clusters_to_blocks(fs, 1);
cpos = ocfs2_blocks_to_clusters(fs, v_blkno);
ret = ocfs2_get_clusters(cinode, cpos, &p_cluster,
&num_clusters, extent_flags);
if (ret)
goto out;
/*
* p_cluster == 0 indicates a hole.
*/
if (p_cluster) {
boff = ocfs2_clusters_to_blocks(fs, p_cluster);
boff += (v_blkno & (uint64_t)(bpc - 1));
}
*p_blkno = boff;
if (ret_count) {
*ret_count = ocfs2_clusters_to_blocks(fs, num_clusters);
*ret_count -= v_blkno & (uint64_t)(bpc - 1);
}
out:
return ret;
}
