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From: Greg KH on 30 Jul 2010 15:10
2.6.32-stable review patch. If anyone has any objections, please let us know.

------------------

commit 1296cc85c26e94eb865d03f82140f27d598de467 upstream (as of v2.6.33-rc6)

We should update reserve space if it is delalloc buffer
and that is indicated by EXT4_GET_BLOCKS_DELALLOC_RESERVE flag.
So use EXT4_GET_BLOCKS_DELALLOC_RESERVE in place of
EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE

[ Stable note: This fixes a corruption cuased by the following
reproduction case:

rm -f $TEST_FN
touch $TEST_FN
fallocate -n -o 656712 -l 858907 $TEST_FN
dd if=/dev/zero of=$TEST_FN conv=notrunc bs=1 seek=1011020 count=36983
sync
dd if=/dev/zero of=$TEST_FN conv=notrunc bs=1 seek=332121 count=24005
dd if=/dev/zero of=$TEST_FN conv=notrunc bs=1 seek=1040179 count=93319

If the filesystem is then unmounted and e2fsck run forced, the
i_blocks field for the file $TEST_FN will be found to be incorrect. ]

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar(a)linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso(a)mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de>
---
fs/ext4/ext4.h | 7 ++-----
fs/ext4/extents.c | 4 ++--
fs/ext4/inode.c | 8 ++++----
3 files changed, 8 insertions(+), 11 deletions(-)

--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -361,14 +361,11 @@ struct ext4_new_group_data {
so set the magic i_delalloc_reserve_flag after taking the
inode allocation semaphore for */
#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
- /* Call ext4_da_update_reserve_space() after successfully
- allocating the blocks */
-#define EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE 0x0008
/* caller is from the direct IO path, request to creation of an
unitialized extents if not allocated, split the uninitialized
extent if blocks has been preallocated already*/
-#define EXT4_GET_BLOCKS_DIO 0x0010
-#define EXT4_GET_BLOCKS_CONVERT 0x0020
+#define EXT4_GET_BLOCKS_DIO 0x0008
+#define EXT4_GET_BLOCKS_CONVERT 0x0010
#define EXT4_GET_BLOCKS_DIO_CREATE_EXT (EXT4_GET_BLOCKS_DIO|\
EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
/* Convert extent to initialized after direct IO complete */
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3148,7 +3148,7 @@ out:
* But fallocate would have already updated quota and block
* count for this offset. So cancel these reservation
*/
- if (flags & EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE)
+ if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
ext4_da_update_reserve_space(inode, allocated, 0);

map_out:
@@ -3394,7 +3394,7 @@ int ext4_ext_get_blocks(handle_t *handle
* Update reserved blocks/metadata blocks after successful
* block allocation which had been deferred till now.
*/
- if (flags & EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE)
+ if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
ext4_da_update_reserve_space(inode, allocated, 1);

/*
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1358,7 +1358,7 @@ int ext4_get_blocks(handle_t *handle, st
* reserve space here.
*/
if ((retval > 0) &&
- (flags & EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE))
+ (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE))
ext4_da_update_reserve_space(inode, retval, 1);
}
if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
@@ -2261,10 +2261,10 @@ static int mpage_da_map_blocks(struct mp
* variables are updated after the blocks have been allocated.
*/
new.b_state = 0;
- get_blocks_flags = (EXT4_GET_BLOCKS_CREATE |
- EXT4_GET_BLOCKS_DELALLOC_RESERVE);
+ get_blocks_flags = EXT4_GET_BLOCKS_CREATE;
if (mpd->b_state & (1 << BH_Delay))
- get_blocks_flags |= EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE;
+ get_blocks_flags |= EXT4_GET_BLOCKS_DELALLOC_RESERVE;
+
blks = ext4_get_blocks(handle, mpd->inode, next, max_blocks,
&new, get_blocks_flags);
if (blks < 0) {


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