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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2009-06-02 08:07:57 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2009-06-15 09:40:37 -0700
commit9cb18641b3fd86309735fc4e2df14aaf9c50469c (patch)
tree6b4c350399e274fd627c39c73218b3ef98bfb18f
parentb0b1dd413d407ba6879e8286a10c5781f2f2ec5e (diff)
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 <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-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 03be1225944c..57923cc150c6 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2220,6 +2220,10 @@ 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);
@@ -2241,7 +2245,7 @@ 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) {