On Wed 31-08-22 15:21:00, Zhang Yi wrote:
> ll_rw_block() is not safe for the sync IO path because it skip buffers
> which has been locked by others, it could lead to false positive EIO
> when submitting read IO. So stop using ll_rw_block(), switch to use new
> helpers which could guarantee buffer locked and submit IO if needed.
>
> Signed-off-by: Zhang Yi <yi.zhang@xxxxxxxxxx>
> ---
> fs/buffer.c | 13 ++++++-------
> 1 file changed, 6 insertions(+), 7 deletions(-)
>
> diff --git a/fs/buffer.c b/fs/buffer.c
> index a663191903ed..e14adc638bfe 100644
> --- a/fs/buffer.c
> +++ b/fs/buffer.c
...
> @@ -1342,7 +1342,8 @@ void __breadahead(struct block_device *bdev, sector_t block, unsigned size)
> {
> struct buffer_head *bh = __getblk(bdev, block, size);
> if (likely(bh)) {
> - ll_rw_block(REQ_OP_READ | REQ_RAHEAD, 1, &bh);
> + if (trylock_buffer(bh))
> + __bh_read(bh, REQ_RAHEAD, false);
I suppose this can be bh_readahead()?
> brelse(bh);
> }
> }
Otherwise the patch looks good.
Honza
--
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
