[RFC PATCH v1 1/6] exfat: remove dead hint_bmap updates in I/O and truncate paths

[Chi Zhiling <chizhiling@163.com>]

From: Chi Zhiling <chizhiling@kylinos.cn>

hint_bmap is only consumed by exfat_readdir() during directory
iteration. exfat_map_cluster() runs on the file I/O path (via iomap)
and never reaches directory iteration, and __exfat_truncate() only
resets the hint when the inode is already being evicted, so drop
them along with the now-unused local_clu_offset.

Signed-off-by: Chi Zhiling <chizhiling@kylinos.cn>
---
 fs/exfat/file.c  | 4 ----
 fs/exfat/inode.c | 5 -----
 2 files changed, 9 deletions(-)

diff --git a/fs/exfat/file.c b/fs/exfat/file.c
index a2a9ee1a2004..29c5db12288e 100644
--- a/fs/exfat/file.c
+++ b/fs/exfat/file.c
@@ -278,10 +278,6 @@ int __exfat_truncate(struct inode *inode)
 	/* clear exfat cache */
 	exfat_cache_inval_inode(inode);
 
-	/* hint information */
-	ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
-	ei->hint_bmap.clu = EXFAT_EOF_CLUSTER;
-
 	/* hint_stat will be used if this is directory. */
 	ei->hint_stat.eidx = 0;
 	ei->hint_stat.clu = ei->start_clu;
diff --git a/fs/exfat/inode.c b/fs/exfat/inode.c
index ccd13630187e..d041f893b1c3 100644
--- a/fs/exfat/inode.c
+++ b/fs/exfat/inode.c
@@ -144,7 +144,6 @@ int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 	struct super_block *sb = inode->i_sb;
 	struct exfat_sb_info *sbi = EXFAT_SB(sb);
 	struct exfat_inode_info *ei = EXFAT_I(inode);
-	unsigned int local_clu_offset = clu_offset;
 	unsigned int num_to_be_allocated = 0, num_clusters;
 
 	num_clusters = exfat_bytes_to_cluster(sbi, exfat_ondisk_size(inode));
@@ -234,10 +233,6 @@ int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 			*balloc = true;
 	}
 
-	/* hint information */
-	ei->hint_bmap.off = local_clu_offset;
-	ei->hint_bmap.clu = *clu;
-
 	return 0;
 }
 
-- 
2.53.0