From f0e70fb39944b1345203ab72d4c6117da6bf072a Mon Sep 17 00:00:00 2001 From: "Aneesh Kumar K.V" Date: Tue, 2 Jun 2009 08:09:34 -0400 Subject: [PATCH] ext4: Use a fake block number for delayed new buffer_head (cherry picked from commit 33b9817e2ae097c7b8d256e3510ac6c54fc6d9d0) Use a very large unsigned number (~0xffff) as as the fake block number for the delayed new buffer. The VFS should never try to write out this number, but if it does, this will make it obvious. Signed-off-by: Aneesh Kumar K.V Signed-off-by: "Theodore Ts'o" Signed-off-by: Greg Kroah-Hartman --- fs/ext4/inode.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 301ed5b0fbf6..40519bddce0c 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -2105,6 +2105,10 @@ static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create) { int ret = 0; + sector_t invalid_block = ~((sector_t) 0xffff); + + if (invalid_block < ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es)) + invalid_block = ~0; BUG_ON(create == 0); BUG_ON(bh_result->b_size != inode->i_sb->s_blocksize); @@ -2126,7 +2130,7 @@ static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, /* not enough space to reserve */ return ret; - map_bh(bh_result, inode->i_sb, 0); + map_bh(bh_result, inode->i_sb, invalid_block); set_buffer_new(bh_result); set_buffer_delay(bh_result); } else if (ret > 0) { -- 2.39.2