From: Chi Zhiling <chizhiling@kylinos.cn>

This patch introduces a parameter 'count' to support fetching multiple
clusters in exfat_map_cluster. The returned 'count' indicates the number
of consecutive clusters, or 0 when the input cluster offset is past EOF.

And the 'count' is also an input parameter for the caller to specify the
required number of clusters.

Only NO_FAT_CHAIN files enable multi-cluster fetching in this patch.

After this patch, the time proportion of exfat_get_block has decreased,
The performance data is as follows:

Cluster size: 512 bytes
Sequential read of a 30GB NO_FAT_CHAIN file:
2.4GB/s -> 2.5 GB/s
proportion of exfat_get_block:
10.8% -> 0.02%

Signed-off-by: Chi Zhiling <chizhiling@kylinos.cn>
---
 fs/exfat/inode.c | 33 ++++++++++++++++++++-------------
 1 file changed, 20 insertions(+), 13 deletions(-)

diff --git a/fs/exfat/inode.c b/fs/exfat/inode.c
index 1062ce470cb1..8c49ab15eafe 100644
--- a/fs/exfat/inode.c
+++ b/fs/exfat/inode.c
@@ -124,7 +124,7 @@ 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, int create)
+		unsigned int *clu, unsigned int *count, int create)
 {
 	int ret;
 	unsigned int last_clu;
@@ -147,20 +147,23 @@ static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 
 	*clu = last_clu = ei->start_clu;
 
-	if (ei->flags == ALLOC_NO_FAT_CHAIN) {
-		if (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) {
-			last_clu += clu_offset - 1;
-
-			if (clu_offset == num_clusters)
-				*clu = EXFAT_EOF_CLUSTER;
-			else
-				*clu += clu_offset;
+	if (*clu == EXFAT_EOF_CLUSTER) {
+		*count = 0;
+	} else if (ei->flags == ALLOC_NO_FAT_CHAIN) {
+		last_clu += num_clusters - 1;
+		if (clu_offset < num_clusters) {
+			*clu += clu_offset;
+			*count = num_clusters - clu_offset;
+		} else {
+			*clu = EXFAT_EOF_CLUSTER;
+			*count = 0;
 		}
 	} else if (ei->type == TYPE_FILE) {
 		int err = exfat_get_cluster(inode, clu_offset,
 				clu, &last_clu);
 		if (err)
 			return -EIO;
+		*count = (*clu == EXFAT_EOF_CLUSTER) ? 0 : 1;
 	} else {
 		unsigned int fclus = 0;
 		/* hint information */
@@ -178,6 +181,7 @@ static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 				return -EIO;
 			fclus++;
 		}
+		*count = (*clu == EXFAT_EOF_CLUSTER) ? 0 : 1;
 	}
 
 	if (*clu == EXFAT_EOF_CLUSTER) {
@@ -249,7 +253,7 @@ static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 				num_to_be_allocated--;
 			}
 		}
-
+		*count = 1;
 	}
 
 	/* hint information */
@@ -268,7 +272,7 @@ static int exfat_get_block(struct inode *inode, sector_t iblock,
 	unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
 	int err = 0;
 	unsigned long mapped_blocks = 0;
-	unsigned int cluster, sec_offset;
+	unsigned int cluster, sec_offset, count;
 	sector_t last_block;
 	sector_t phys = 0;
 	sector_t valid_blks;
@@ -281,8 +285,9 @@ static int exfat_get_block(struct inode *inode, sector_t iblock,
 		goto done;
 
 	/* Is this block already allocated? */
+	count = EXFAT_B_TO_CLU_ROUND_UP(bh_result->b_size, sbi);
 	err = exfat_map_cluster(inode, iblock >> sbi->sect_per_clus_bits,
-			&cluster, create);
+			&cluster, &count, create);
 	if (err) {
 		if (err != -ENOSPC)
 			exfat_fs_error_ratelimit(sb,
@@ -293,12 +298,14 @@ static int exfat_get_block(struct inode *inode, sector_t iblock,
 
 	if (cluster == EXFAT_EOF_CLUSTER)
 		goto done;
+	if (WARN_ON_ONCE(!count))
+		count = 1;
 
 	/* sector offset in cluster */
 	sec_offset = iblock & (sbi->sect_per_clus - 1);
 
 	phys = exfat_cluster_to_sector(sbi, cluster) + sec_offset;
-	mapped_blocks = sbi->sect_per_clus - sec_offset;
+	mapped_blocks = count * sbi->sect_per_clus - sec_offset;
 	max_blocks = min(mapped_blocks, max_blocks);
 
 	map_bh(bh_result, sb, phys);
-- 
2.43.0