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Commit 33b9817e authored by Aneesh Kumar K.V's avatar Aneesh Kumar K.V Committed by Theodore Ts'o
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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: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent 9c1ee184

fs/ext4/inode.c

+5 −1
Original line number Diff line number Diff line
@@ -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) {