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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2009-05-12 14:40:37 -0400
committerTheodore Ts'o <tytso@mit.edu>2009-05-12 14:40:37 -0400
commit33b9817e2ae097c7b8d256e3510ac6c54fc6d9d0 (patch)
tree3de27ab9a089fb53503fdcc2746e396ee9fb78d0 /fs
parent9c1ee184a30394e54165fa4c15923cabd952c106 (diff)
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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>
Diffstat (limited to 'fs')
-rw-r--r--fs/ext4/inode.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index d4b634ae06b..0ac31a06422 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2297,6 +2297,10 @@ 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);
@@ -2318,7 +2322,7 @@ 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) {