From: Tao Ma <boyu.mt@xxxxxxxxxx>
When we want to convert the unitialized extent in direct write,
we can either do it in ext4_end_io_nolock(AIO case) or in
ext4_ext_direct_IO(non AIO case) and EXT4_I(inode)->cur_aio_dio
is a guard for ext4_ext_map_blocks to find the right case.
In e9e3bcecf, we mistakenly change it by:
- if (io)
+ if (io && !(io->flag & EXT4_IO_END_UNWRITTEN)) {
io->flag = EXT4_IO_END_UNWRITTEN;
- else
+ atomic_inc(&EXT4_I(inode)->i_aiodio_unwritten);
+ } else
ext4_set_inode_state(inode,
EXT4_STATE_DIO_UNWRITTEN);
So now if we map 2 blocks, and the first one set the EXT_IO_END_UNWRITTEN, the
2nd mapping will set inode state because of the check for the flag. This is
wrong.
Cc: Eric Sandeen <sandeen@xxxxxxxxxx>
Cc: "Theodore Ts'o" <tytso@xxxxxxx>
Signed-off-by: Tao Ma <boyu.mt@xxxxxxxxxx>
---
fs/ext4/extents.c | 16 ++++++++++------
1 files changed, 10 insertions(+), 6 deletions(-)
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 57cf568..8db6743 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3190,9 +3190,11 @@ ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode,
* that this IO needs to conversion to written when IO is
* completed
*/
- if (io && !(io->flag & EXT4_IO_END_UNWRITTEN)) {
- io->flag = EXT4_IO_END_UNWRITTEN;
- atomic_inc(&EXT4_I(inode)->i_aiodio_unwritten);
+ if (io) {
+ if (!(io->flag & EXT4_IO_END_UNWRITTEN)) {
+ io->flag = EXT4_IO_END_UNWRITTEN;
+ atomic_inc(&EXT4_I(inode)->i_aiodio_unwritten);
+ }
} else
ext4_set_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN);
if (ext4_should_dioread_nolock(inode))
@@ -3572,9 +3574,11 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
* that we need to perform conversion when IO is done.
*/
if ((flags & EXT4_GET_BLOCKS_PRE_IO)) {
- if (io && !(io->flag & EXT4_IO_END_UNWRITTEN)) {
- io->flag = EXT4_IO_END_UNWRITTEN;
- atomic_inc(&EXT4_I(inode)->i_aiodio_unwritten);
+ if (io) {
+ if (!(io->flag & EXT4_IO_END_UNWRITTEN)) {
+ io->flag = EXT4_IO_END_UNWRITTEN;
+ atomic_inc(&EXT4_I(inode)->i_aiodio_unwritten);
+ }
} else
ext4_set_inode_state(inode,
EXT4_STATE_DIO_UNWRITTEN);
--
1.7.4.1
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