linux-kernel - [PATCH 08/21] fat: Fix fat_ent_update

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Message-ID: <649ecd633e848f5f6e6822369.ps@mail.parknet.co.jp>
Date:	Wed, 15 Oct 2008 22:57:58 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, hirofumi@...l.parknet.co.jp
Subject: [PATCH 08/21] fat: Fix fat_ent_update_ptr() for FAT12


This fixes the missing update for bhs/nr_bhs in case the caller
accessed from block boundary to first block of boundary.

Signed-off-by: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
---

 fs/fat/fatent.c |   18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff -puN fs/fat/fatent.c~fat-fix-fat12-update_ptr fs/fat/fatent.c
--- linux-2.6/fs/fat/fatent.c~fat-fix-fat12-update_ptr	2008-10-11 23:46:04.000000000 +0900
+++ linux-2.6-hirofumi/fs/fat/fatent.c	2008-10-11 23:46:04.000000000 +0900
@@ -317,10 +317,20 @@ static inline int fat_ent_update_ptr(str
 	/* Is this fatent's blocks including this entry? */
 	if (!fatent->nr_bhs || bhs[0]->b_blocknr != blocknr)
 		return 0;
-	/* Does this entry need the next block? */
-	if (sbi->fat_bits == 12 && (offset + 1) >= sb->s_blocksize) {
-		if (fatent->nr_bhs != 2 || bhs[1]->b_blocknr != (blocknr + 1))
-			return 0;
+	if (sbi->fat_bits == 12) {
+		if ((offset + 1) < sb->s_blocksize) {
+			/* This entry is on bhs[0]. */
+			if (fatent->nr_bhs == 2) {
+				brelse(bhs[1]);
+				fatent->nr_bhs = 1;
+			}
+		} else {
+			/* This entry needs the next block. */
+			if (fatent->nr_bhs != 2)
+				return 0;
+			if (bhs[1]->b_blocknr != (blocknr + 1))
+				return 0;
+		}
 	}
 	ops->ent_set_ptr(fatent, offset);
 	return 1;
_
--
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