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ext4: Use a fake block number for delayed new buffer_head 

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 <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Aneesh Kumar K.V 2009-05-12 14:40:37 -04:00 committed by Theodore Ts'o
parent 9c1ee184a3
commit 33b9817e2a
1 changed files with 5 additions and 1 deletions
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6
fs/ext4/inode.c
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@ -2297,6 +2297,10 @@ static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create) struct buffer_head *bh_result, int create)
{ {
int ret = 0; 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(create == 0);
BUG_ON(bh_result->b_size != inode->i_sb->s_blocksize); BUG_ON(bh_result->b_size != inode->i_sb->s_blocksize);
@ -2318,7 +2322,7 @@ static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
/* not enough space to reserve */ /* not enough space to reserve */
return ret; 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_new(bh_result);
set_buffer_delay(bh_result); set_buffer_delay(bh_result);
} else if (ret > 0) { } else if (ret > 0) {