There is a slight optimisation to be had by calculating the correct pos
pointer inside io_kiocb_update_pos and then using that later.
It seems code size drops by a bit:
000000000000a1b0 0000000000000400 t io_read
000000000000a5b0 0000000000000319 t io_write
vs
000000000000a1b0 00000000000003f6 t io_read
000000000000a5b0 0000000000000310 t io_write
Signed-off-by: Dylan Yudaken <dylany@xxxxxx>
---
fs/io_uring.c | 18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 50b93ff2ee12..abd8c739988e 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -3066,17 +3066,21 @@ static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret)
}
}
-static inline void
+static inline loff_t*
io_kiocb_update_pos(struct io_kiocb *req, struct kiocb *kiocb)
{
+ bool is_stream = req->file->f_mode & FMODE_STREAM;
if (kiocb->ki_pos == -1) {
- if (!(req->file->f_mode & FMODE_STREAM)) {
+ if (!is_stream) {
req->flags |= REQ_F_CUR_POS;
kiocb->ki_pos = req->file->f_pos;
+ return &kiocb->ki_pos;
} else {
kiocb->ki_pos = 0;
+ return NULL;
}
}
+ return is_stream ? NULL : &kiocb->ki_pos;
}
static void kiocb_done(struct io_kiocb *req, ssize_t ret,
@@ -3637,6 +3641,7 @@ static int io_read(struct io_kiocb *req, unsigned int issue_flags)
bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
struct io_async_rw *rw;
ssize_t ret, ret2;
+ loff_t *ppos;
if (!req_has_async_data(req)) {
ret = io_import_iovec(READ, req, &iovec, s, issue_flags);
@@ -3667,9 +3672,9 @@ static int io_read(struct io_kiocb *req, unsigned int issue_flags)
kiocb->ki_flags &= ~IOCB_NOWAIT;
}
- io_kiocb_update_pos(req, kiocb);
+ ppos = io_kiocb_update_pos(req, kiocb);
- ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), req->result);
+ ret = rw_verify_area(READ, req->file, ppos, req->result);
if (unlikely(ret)) {
kfree(iovec);
return ret;
@@ -3768,6 +3773,7 @@ static int io_write(struct io_kiocb *req, unsigned int issue_flags)
struct kiocb *kiocb = &req->rw.kiocb;
bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
ssize_t ret, ret2;
+ loff_t *ppos;
if (!req_has_async_data(req)) {
ret = io_import_iovec(WRITE, req, &iovec, s, issue_flags);
@@ -3798,9 +3804,9 @@ static int io_write(struct io_kiocb *req, unsigned int issue_flags)
kiocb->ki_flags &= ~IOCB_NOWAIT;
}
- io_kiocb_update_pos(req, kiocb);
+ ppos = io_kiocb_update_pos(req, kiocb);
- ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), req->result);
+ ret = rw_verify_area(WRITE, req->file, ppos, req->result);
if (unlikely(ret))
goto out_free;
--
2.30.2
