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| author | Chandan Rajendra <chandan@linux.vnet.ibm.com> | 2017-01-10 23:29:54 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-01-10 23:29:54 +0300 |
| commit | dd545b52a3e1efd9f2c6352dbe95ccd0c53461cc (patch) | |
| tree | e60b234f4d912a7d8f0e7a8f248233cd263b3e23 | |
| parent | a121103c922847ba5010819a3f250f1f7fc84ab8 (diff) | |
| download | linux-dd545b52a3e1efd9f2c6352dbe95ccd0c53461cc.tar.xz | |
do_direct_IO: Use inode->i_blkbits to compute block count to be cleaned
The code currently uses sdio->blkbits to compute the number of blocks to
be cleaned. However sdio->blkbits is derived from the logical block size
of the underlying block device (Refer to the definition of
do_blockdev_direct_IO()). Due to this, generic/299 test would rarely
fail when executed on an ext4 filesystem with 64k as the block size and
when using a virtio based disk (having 512 byte as the logical block
size) inside a kvm guest.
This commit fixes the bug by using inode->i_blkbits to compute the
number of blocks to be cleaned.
Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Fixed up by Jeff Moyer to only use/evaluate inode->i_blkbits once,
to avoid issues with block size changes with IO in flight.
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | fs/direct-io.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/direct-io.c b/fs/direct-io.c index aeae8c063451..c87bae4376b8 100644 --- a/fs/direct-io.c +++ b/fs/direct-io.c @@ -906,6 +906,7 @@ static int do_direct_IO(struct dio *dio, struct dio_submit *sdio, struct buffer_head *map_bh) { const unsigned blkbits = sdio->blkbits; + const unsigned i_blkbits = blkbits + sdio->blkfactor; int ret = 0; while (sdio->block_in_file < sdio->final_block_in_request) { @@ -949,7 +950,7 @@ static int do_direct_IO(struct dio *dio, struct dio_submit *sdio, clean_bdev_aliases( map_bh->b_bdev, map_bh->b_blocknr, - map_bh->b_size >> blkbits); + map_bh->b_size >> i_blkbits); } if (!sdio->blkfactor) |