When a read bio_copy_kern() request fails, the content of the bounce buffer is not copied back. However, as request failure doesn't necessarily mean complete failure, the buffer state can be useful. This behavior is also inconsistent with the user map counterpart and causes the subtle difference between bounced and unbounced IO causes confusion. This patch makes bio_copy_kern_endio() ignore @err and always copy back data on request completion. Signed-off-by: Tejun Heo <tj@xxxxxxxxxx> Cc: Jens Axboe <jens.axboe@xxxxxxxxxx> Cc: Boaz Harrosh <bharrosh@xxxxxxxxxxx> Cc: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx> --- fs/bio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: block/fs/bio.c =================================================================== --- block.orig/fs/bio.c +++ block/fs/bio.c @@ -1198,7 +1198,7 @@ static void bio_copy_kern_endio(struct b char *addr = page_address(bvec->bv_page); int len = bmd->iovecs[i].bv_len; - if (read && !err) + if (read) memcpy(p, addr, len); __free_page(bvec->bv_page); -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
