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[PATCH] ext3: multile block allocate little endian fixes 

Some places in ext3 multiple block allocation code (in 2.6.17-rc3) don't
handle the little endian well.  This was resulting in *wrong* block numbers
being assigned to in-memory block variables and then stored on disk
eventually.  The following patch has been verified to fix an ext3
filesystem failure when run ltp test on a 64 bit machine.

Signed-off-by; Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Mingming Cao 2006-05-03 19:55:12 -07:00 committed by Linus Torvalds
parent 8683dc9990
commit 5dea5176e5
1 changed files with 8 additions and 5 deletions
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13
fs/ext3/inode.c
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@ -711,7 +711,7 @@ static int ext3_splice_branch(handle_t *handle, struct inode *inode,
* direct blocks blocks
*/
if (num == 0 && blks > 1) {
current_block = le32_to_cpu(where->key + 1);
current_block = le32_to_cpu(where->key) + 1;
for (i = 1; i < blks; i++)
*(where->p + i ) = cpu_to_le32(current_block++);
}
@ -724,7 +724,7 @@ static int ext3_splice_branch(handle_t *handle, struct inode *inode,
if (block_i) {
block_i->last_alloc_logical_block = block + blks - 1;
block_i->last_alloc_physical_block =
le32_to_cpu(where[num].key + blks - 1);
le32_to_cpu(where[num].key) + blks - 1;
}
/* We are done with atomic stuff, now do the rest of housekeeping */
@ -814,11 +814,13 @@ int ext3_get_blocks_handle(handle_t *handle, struct inode *inode,
/* Simplest case - block found, no allocation needed */
if (!partial) {
first_block = chain[depth - 1].key;
first_block = le32_to_cpu(chain[depth - 1].key);
clear_buffer_new(bh_result);
count++;
/*map more blocks*/
while (count < maxblocks && count <= blocks_to_boundary) {
unsigned long blk;
if (!verify_chain(chain, partial)) {
/*
* Indirect block might be removed by
@ -831,8 +833,9 @@ int ext3_get_blocks_handle(handle_t *handle, struct inode *inode,
count = 0;
break;
}
if (le32_to_cpu(*(chain[depth-1].p+count) ==
(first_block + count)))
blk = le32_to_cpu(*(chain[depth-1].p + count));
if (blk == first_block + count)
count++;
else
break;