[PATCH 2.4] FAT: do not continue in fat_get_block if bmap fails

[Stefan Seyfried <stefan.seyfried@googlemail.com>]

From: Stefan Seyfried <seife@sphairon.com>

There is no use in continuing the write operation after fat_bmap() fails.
(This successfully killed a VFAT FS for me).
The corresponding code in 2.6 does return here as well, AFAICT.

Signed-off-by: Stefan Seyfried <seife@sphairon.com>
---
 fs/fat/file.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/fs/fat/file.c b/fs/fat/file.c
index ade1a71..75efe74 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -72,8 +72,10 @@ int fat_get_block(struct inode *inode, long iblock, struct buffer_head *bh_resul
 	}
 	MSDOS_I(inode)->mmu_private += sb->s_blocksize;
 	phys = fat_bmap(inode, iblock);
-	if (!phys)
+	if (!phys) {
 		BUG();
+		return -EIO;
+	}
 	bh_result->b_dev = inode->i_dev;
 	bh_result->b_blocknr = phys;
 	bh_result->b_state |= (1UL << BH_Mapped);
-- 
1.6.4.2