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Date:	Sun, 29 Jul 2012 07:31:54 -0400
From:	Namjae Jeon <linkinjeon@...il.com>
To:	tytso@....edu, sandeen@...hat.com, lczerner@...hat.com,
	linux-ext4@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Namjae Jeon <linkinjeon@...il.com>,
	Amit Sahrawat <amit.sahrawat83@...il.com>
Subject: [PATCH] ext4: add error handling when discard cmd is fail in FITRIM

Although free extents is proper not trimmed(mmc driver return error code
while sending trim command), currently FITRIM ioctl return success.
Add exception routine to inform user error code.

#> ./fitrim_test
end_request: I/O error, dev mmcblk0, sector 27232
EXT4-fs warning (device mmcblk0): ext4_trim_all_free:4857:
Discard command returned error -5
#>

Signed-off-by: Namjae Jeon <linkinjeon@...il.com>
Signed-off-by: Amit Sahrawat <amit.sahrawat83@...il.com>
Reviewed-by: Jan Kara <jack@...e.cz>
---
 fs/ext4/mballoc.c |   25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 8eae947..07569b6 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4852,10 +4852,11 @@ error_return:
  * one will allocate those blocks, mark it as used in buddy bitmap. This must
  * be called with under the group lock.
  */
-static void ext4_trim_extent(struct super_block *sb, int start, int count,
+static int ext4_trim_extent(struct super_block *sb, int start, int count,
 			     ext4_group_t group, struct ext4_buddy *e4b)
 {
 	struct ext4_free_extent ex;
+	int err;
 
 	trace_ext4_trim_extent(sb, group, start, count);
 
@@ -4871,9 +4872,10 @@ static void ext4_trim_extent(struct super_block *sb, int start, int count,
 	 */
 	mb_mark_used(e4b, &ex);
 	ext4_unlock_group(sb, group);
-	ext4_issue_discard(sb, group, start, count);
+	err = ext4_issue_discard(sb, group, start, count);
 	ext4_lock_group(sb, group);
 	mb_free_blocks(NULL, e4b, start, ex.fe_len);
+	return err;
 }
 
 /**
@@ -4902,7 +4904,7 @@ ext4_trim_all_free(struct super_block *sb, ext4_group_t group,
 	void *bitmap;
 	ext4_grpblk_t next, count = 0, free_count = 0;
 	struct ext4_buddy e4b;
-	int ret;
+	int ret = 0;
 
 	trace_ext4_trim_all_free(sb, group, start, max);
 
@@ -4929,15 +4931,22 @@ ext4_trim_all_free(struct super_block *sb, ext4_group_t group,
 		next = mb_find_next_bit(bitmap, max + 1, start);
 
 		if ((next - start) >= minblocks) {
-			ext4_trim_extent(sb, start,
-					 next - start, group, &e4b);
-			count += next - start;
+			ret = ext4_trim_extent(sb, start,
+						next - start, group, &e4b);
+			if (ret < 0) {
+				if (ret != -EOPNOTSUPP)
+					ext4_warning(sb,
+						"Discard command returned error %d\n",
+						ret);
+					break;
+			} else
+				count += next - start;
 		}
 		free_count += next - start;
 		start = next + 1;
 
 		if (fatal_signal_pending(current)) {
-			count = -ERESTARTSYS;
+			ret = -ERESTARTSYS;
 			break;
 		}
 
@@ -4960,7 +4969,7 @@ out:
 	ext4_debug("trimmed %d blocks in the group %d\n",
 		count, group);
 
-	return count;
+	return (ret < 0) ? ret : count;
 }
 
 /**
-- 
1.7.9.5

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