From: Pavel Begunkov <[email protected]>
To: [email protected]
Cc: Jens Axboe <[email protected]>, [email protected]
Subject: [PATCH 3/3] io_uring: simplify io_file_supports_nowait()
Date: Sun, 17 Oct 2021 00:07:10 +0100 [thread overview]
Message-ID: <60c8f1f5e2cb45e00f4897b2cec10c5b3669da91.1634425438.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>
Make sure that REQ_F_SUPPORT_NOWAIT is always set io_prep_rw(), and so
we can stop caring about setting it down the line simplifying
io_file_supports_nowait().
Signed-off-by: Pavel Begunkov <[email protected]>
---
fs/io_uring.c | 34 ++++++++++++++++++++++------------
1 file changed, 22 insertions(+), 12 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 06444b2f9a32..18dac2aece59 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2767,10 +2767,8 @@ static bool io_bdev_nowait(struct block_device *bdev)
* any file. For now, just ensure that anything potentially problematic is done
* inline.
*/
-static bool __io_file_supports_nowait(struct file *file)
+static bool __io_file_supports_nowait(struct file *file, umode_t mode)
{
- umode_t mode = file_inode(file)->i_mode;
-
if (S_ISBLK(mode)) {
if (IS_ENABLED(CONFIG_BLOCK) &&
io_bdev_nowait(I_BDEV(file->f_mapping->host)))
@@ -2793,11 +2791,26 @@ static bool __io_file_supports_nowait(struct file *file)
return file->f_mode & FMODE_NOWAIT;
}
+/*
+ * If we tracked the file through the SCM inflight mechanism, we could support
+ * any file. For now, just ensure that anything potentially problematic is done
+ * inline.
+ */
+static unsigned int io_file_get_flags(struct file *file)
+{
+ umode_t mode = file_inode(file)->i_mode;
+ unsigned int res = 0;
+
+ if (S_ISREG(mode))
+ res |= FFS_ISREG;
+ if (__io_file_supports_nowait(file, mode))
+ res |= FFS_NOWAIT;
+ return res;
+}
+
static inline bool io_file_supports_nowait(struct io_kiocb *req)
{
- if (likely(req->flags & REQ_F_SUPPORT_NOWAIT))
- return true;
- return __io_file_supports_nowait(req->file);
+ return req->flags & REQ_F_SUPPORT_NOWAIT;
}
static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe,
@@ -2809,8 +2822,8 @@ static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe,
unsigned ioprio;
int ret;
- if (!io_req_ffs_set(req) && S_ISREG(file_inode(file)->i_mode))
- req->flags |= REQ_F_ISREG;
+ if (!io_req_ffs_set(req))
+ req->flags |= io_file_get_flags(file) << REQ_F_SUPPORT_NOWAIT_BIT;
kiocb->ki_pos = READ_ONCE(sqe->off);
if (kiocb->ki_pos == -1 && !(file->f_mode & FMODE_STREAM)) {
@@ -6764,10 +6777,7 @@ static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file
{
unsigned long file_ptr = (unsigned long) file;
- if (__io_file_supports_nowait(file))
- file_ptr |= FFS_NOWAIT;
- if (S_ISREG(file_inode(file)->i_mode))
- file_ptr |= FFS_ISREG;
+ file_ptr |= io_file_get_flags(file);
file_slot->file_ptr = file_ptr;
}
--
2.33.0
next prev parent reply other threads:[~2021-10-16 23:08 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-16 23:07 [PATCH 0/3] rw optimisation partial resend Pavel Begunkov
2021-10-16 23:07 ` [PATCH 1/3] io_uring: arm poll for non-nowait files Pavel Begunkov
2021-10-16 23:07 ` [PATCH 2/3] io_uring: combine REQ_F_NOWAIT_{READ,WRITE} flags Pavel Begunkov
2021-10-16 23:07 ` Pavel Begunkov [this message]
2021-10-16 23:11 ` [PATCH 0/3] rw optimisation partial resend Pavel Begunkov
2021-10-16 23:17 ` Pavel Begunkov
2021-10-17 14:25 ` Jens Axboe
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