It's a bit more convenient for us to store a registered buffer end
address instead of length, see struct io_mapped_ubuf, as it allow to not
recompute it every time.
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
---
fs/io_uring.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 053baa4ca02e..bafe84ad5b32 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -194,7 +194,7 @@ enum io_uring_cmd_flags {
struct io_mapped_ubuf {
u64 ubuf;
- size_t len;
+ u64 ubuf_end;
struct bio_vec *bvec;
unsigned int nr_bvecs;
unsigned long acct_pages;
@@ -2783,7 +2783,7 @@ static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter)
if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end)))
return -EFAULT;
/* not inside the mapped region */
- if (buf_addr < imu->ubuf || buf_end > imu->ubuf + imu->len)
+ if (unlikely(buf_addr < imu->ubuf || buf_end > imu->ubuf_end))
return -EFAULT;
/*
@@ -8296,7 +8296,7 @@ static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov,
}
/* store original address for later verification */
imu->ubuf = ubuf;
- imu->len = iov->iov_len;
+ imu->ubuf_end = ubuf + iov->iov_len;
imu->nr_bvecs = nr_pages;
ret = 0;
done:
@@ -9353,9 +9353,9 @@ static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m)
seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs);
for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) {
struct io_mapped_ubuf *buf = &ctx->user_bufs[i];
+ unsigned int len = buf->ubuf_end - buf->ubuf;
- seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf,
- (unsigned int) buf->len);
+ seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf, len);
}
if (has_lock && !xa_empty(&ctx->personalities)) {
unsigned long index;
--
2.24.0
