Let the block device know when sectors can be discarded
[hirofumi@mail.parknet.co.jp: discard _after_ checking for corrupt chains]
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fs/fat/fatent.c b/fs/fat/fatent.c
index 302e95c..fb98b3d 100644
--- a/fs/fat/fatent.c
+++ b/fs/fat/fatent.c
@@ -6,6 +6,7 @@
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/msdos_fs.h>
+#include <linux/blkdev.h>
struct fatent_operations {
void (*ent_blocknr)(struct super_block *, int, int *, sector_t *);
@@ -535,6 +536,7 @@
struct fat_entry fatent;
struct buffer_head *bhs[MAX_BUF_PER_PAGE];
int i, err, nr_bhs;
+ int first_cl = cluster;
nr_bhs = 0;
fatent_init(&fatent);
@@ -551,6 +553,18 @@
goto error;
}
+ /*
+ * Issue discard for the sectors we no longer care about,
+ * batching contiguous clusters into one request
+ */
+ if (cluster != fatent.entry + 1) {
+ int nr_clus = fatent.entry - first_cl + 1;
+
+ sb_issue_discard(sb, fat_clus_to_blknr(sbi, first_cl),
+ nr_clus * sbi->sec_per_clus);
+ first_cl = cluster;
+ }
+
ops->ent_put(&fatent, FAT_ENT_FREE);
if (sbi->free_clusters != -1) {
sbi->free_clusters++;