[PATCH v4 03/11] exfat: add balloc parameter to exfat_map_cluster() for iomap support

[Namjae Jeon <linkinjeon@kernel.org>]

In preparation for supporting the iomap infrastructure, we need to know
whether a new cluster was allocated or not in exfat_map_cluster().

Add an optional 'bool *balloc' output parameter. When a new cluster is
allocated, *balloc is set to true. Pass NULL from exfat_get_block() to
preserve the existing behavior.

Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
---
 fs/exfat/inode.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/exfat/inode.c b/fs/exfat/inode.c
index 249a35e2b4b2..a10d4f3c66a1 100644
--- a/fs/exfat/inode.c
+++ b/fs/exfat/inode.c
@@ -124,7 +124,8 @@ void exfat_sync_inode(struct inode *inode)
  * *clu = (~0), if it's unable to allocate a new cluster
  */
 static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
-		unsigned int *clu, unsigned int *count, int create)
+		unsigned int *clu, unsigned int *count, int create,
+		bool *balloc)
 {
 	int ret;
 	unsigned int last_clu;
@@ -229,6 +230,8 @@ static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 		if (exfat_cluster_walk(sb, clu, num_to_be_allocated - 1, ei->flags))
 			return -EIO;
 		*count = 1;
+		if (balloc)
+			*balloc = true;
 	}
 
 	/* hint information */
@@ -262,7 +265,7 @@ static int exfat_get_block(struct inode *inode, sector_t iblock,
 	/* Is this block already allocated? */
 	count = exfat_bytes_to_cluster_round_up(sbi, bh_result->b_size);
 	err = exfat_map_cluster(inode, iblock >> sbi->sect_per_clus_bits,
-			&cluster, &count, create);
+			&cluster, &count, create, NULL);
 	if (err) {
 		if (err != -ENOSPC)
 			exfat_fs_error_ratelimit(sb,
-- 
2.25.1