@@ -517,10 +517,17 @@ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{
int ret;
+ u32 cpos = 0;
+ int alloc_locked = 0;
u64 p_blkno, inode_blocks, contig_blocks;
unsigned int ext_flags;
unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
+ unsigned long len = bh_result->b_size;
+ struct buffer_head *di_bh = NULL;
+ unsigned int clusters_to_alloc = 0;
+
+ cpos = ocfs2_blocks_to_clusters(inode->i_sb, iblock);
/* This function won't even be called if the request isn't all
* nicely aligned and of the right size, so there's no need
@@ -542,6 +549,39 @@ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
/* We should already CoW the refcounted extent in case of create. */
BUG_ON(create && (ext_flags & OCFS2_EXT_REFCOUNTED));
+ /* allocate blocks if no p_blkno is found, and create==1 */
+ if (!p_blkno && create) {
+ ret = ocfs2_inode_lock(inode, &di_bh, 1);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto bail;
+ }
+ alloc_locked = 1;
+
+ /* fill hole, allocate blocks can't be larger than the size
+ * of the hole */
+ clusters_to_alloc = ocfs2_clusters_for_bytes(inode->i_sb, len);
+ if (clusters_to_alloc > contig_blocks)
+ clusters_to_alloc = contig_blocks;
+
+ /* allocate extent and insert them into the extent tree */
+ ret = __ocfs2_extend_allocation(inode, cpos,
+ clusters_to_alloc, 0);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto bail;
+ }
+
+ ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno,
+ &contig_blocks, &ext_flags);
+ if (ret) {
+ mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n",
+ (unsigned long long)iblock);
+ ret = -EIO;
+ goto bail;
+ }
+ }
+
/*
* get_more_blocks() expects us to describe a hole by clearing
* the mapped bit on bh_result().
This commit allocate blocks in ocfs2_direct_IO_get_blocks, so in append direct-io write and fill holes write situation, direct-io write doesn't need fallback to buffer I/O any more. Signed-off-by: Weiwei Wang <wangww631@huawei.com> --- fs/ocfs2/aops.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) -- 1.8.4.3