[PATCH 08/21] fat: Fix fat_ent_update_ptr() for FAT12

OGAWA Hirofumi
2008-10-15T14:10:19Z

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@mail.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;
_