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io_uring: simplify io_file_supports_nowait() 

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 <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/60c8f1f5e2cb45e00f4897b2cec10c5b3669da91.1634425438.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-10-17 00:07:10 +01:00 коммит произвёл Jens Axboe
Родитель 35645ac3c1
Коммит 88459b50b4
1 изменённых файлов: 22 добавлений и 12 удалений
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34
fs/io_uring.c
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@ -2764,10 +2764,8 @@ 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)))
@ -2790,11 +2788,26 @@ 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,
@ -2806,8 +2819,8 @@ 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)) {
@ -6761,10 +6774,7 @@ 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;
}