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-rw-r--r--fs/ocfs2/aops.c45
1 files changed, 42 insertions, 3 deletions
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index be5986b7e5c6..44db1808cdb5 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -510,18 +510,21 @@ bail:
*
* called like this: dio->get_blocks(dio->inode, fs_startblk,
* fs_count, map_bh, dio->rw == WRITE);
- *
- * Note that we never bother to allocate blocks here, and thus ignore the
- * create argument.
*/
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;
+ 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
@@ -543,6 +546,40 @@ 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, NULL, 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 < 0) {
+ 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().
@@ -560,6 +597,8 @@ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
contig_blocks = max_blocks;
bh_result->b_size = contig_blocks << blocksize_bits;
bail:
+ if (alloc_locked)
+ ocfs2_inode_unlock(inode, 1);
return ret;
}