Merge git://git.kernel.org/pub/scm/linux/kernel/git/hirofumi/fatfs-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/hirofumi/fatfs-2.6:
fat: make discard a mount option

fs/fat/fat.h

···
 		 nocase:1,	  /* Does this need case conversion? 0=need case conversion*/
 		 usefree:1,	  /* Use free_clusters for FAT32 */
 		 tz_utc:1,	  /* Filesystem timestamps are in UTC */
-		 rodir:1;	  /* allow ATTR_RO for directory */
+		 rodir:1,	  /* allow ATTR_RO for directory */
+		 discard:1;	  /* Issue discard requests on deletions */
 };
 
 #define FAT_HASH_BITS	8

fs/fat/fatent.c

···
 			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;
+		if (sbi->options.discard) {
+			/*
+			 * 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;
+				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);

fs/fat/inode.c

···
 		seq_puts(m, ",errors=panic");
 	else
 		seq_puts(m, ",errors=remount-ro");
+	if (opts->discard)
+		seq_puts(m, ",discard");
 
 	return 0;
 }
···
 	Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes,
 	Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes,
 	Opt_obsolate, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err_cont,
-	Opt_err_panic, Opt_err_ro, Opt_err,
+	Opt_err_panic, Opt_err_ro, Opt_discard, Opt_err,
 };
 
 static const match_table_t fat_tokens = {
···
 	{Opt_err_cont, "errors=continue"},
 	{Opt_err_panic, "errors=panic"},
 	{Opt_err_ro, "errors=remount-ro"},
+	{Opt_discard, "discard"},
 	{Opt_obsolate, "conv=binary"},
 	{Opt_obsolate, "conv=text"},
 	{Opt_obsolate, "conv=auto"},
···
 			break;
 		case Opt_rodir:
 			opts->rodir = 1;
+			break;
+		case Opt_discard:
+			opts->discard = 1;
 			break;
 
 		/* obsolete mount options */