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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@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
OGAWA Hirofumi 2008-11-06 12:53:49 -08:00 committed by Linus Torvalds
parent d3dfa8228f
commit 5e35dd4651
1 changed files with 14 additions and 4 deletions
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18
fs/fat/fatent.c
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@ -317,10 +317,20 @@ static inline int fat_ent_update_ptr(struct super_block *sb,
/* 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;