forge/linux-pinenote
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

ext4: Add BUG_ON debugging checks to noalloc_get_block_write()

Browse source 
Enforce that noalloc_get_block_write() is only called to map one block
at a time, and that it always is successful in finding a mapping for
given an inode's logical block block number if it is called with
create == 1.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2009-05-12 13:51:29 -04:00
commit a2dc52b5d1
1 changed files with 3 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

3
fs/ext4/inode.c
View file

@ -2433,11 +2433,14 @@ static int noalloc_get_block_write(struct inode *inode, sector_t iblock,
int ret = 0;
unsigned max_blocks = bh_result->b_size >> inode->i_blkbits;
BUG_ON(bh_result->b_size != inode->i_sb->s_blocksize);
/*
* we don't want to do block allocation in writepage
* so call get_block_wrap with create = 0
*/
ret = ext4_get_blocks(NULL, inode, iblock, max_blocks, bh_result, 0);
BUG_ON(create && ret == 0);
if (ret > 0) {
bh_result->b_size = (ret << inode->i_blkbits);
ret = 0;