From de4f5fed3f231a8ff4790bf52975f847b95b85ea Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Wed, 29 Mar 2023 08:52:15 -0600 Subject: iov_iter: add iter_iovec() helper This returns a pointer to the current iovec entry in the iterator. Only useful with ITER_IOVEC right now, but it prepares us to treat ITER_UBUF and ITER_IOVEC identically for the first segment. Rename struct iov_iter->iov to iov_iter->__iov to find any potentially troublesome spots, and also to prevent anyone from adding new code that accesses iter->iov directly. Signed-off-by: Jens Axboe --- fs/btrfs/file.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) (limited to 'fs/btrfs') diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 5cc5a1faaef5..f649647392e0 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -3730,10 +3730,15 @@ static int check_direct_read(struct btrfs_fs_info *fs_info, if (!iter_is_iovec(iter)) return 0; - for (seg = 0; seg < iter->nr_segs; seg++) - for (i = seg + 1; i < iter->nr_segs; i++) - if (iter->iov[seg].iov_base == iter->iov[i].iov_base) + for (seg = 0; seg < iter->nr_segs; seg++) { + for (i = seg + 1; i < iter->nr_segs; i++) { + const struct iovec *iov1 = iter_iov(iter) + seg; + const struct iovec *iov2 = iter_iov(iter) + i; + + if (iov1->iov_base == iov2->iov_base) return -EINVAL; + } + } return 0; } -- cgit v1.2.3