From: Jens Axboe <axboe@kernel.dk>
To: linux-block@vger.kernel.org, linux-aio@kvack.org,
linux-fsdevel@vger.kernel.org
Cc: Jens Axboe <axboe@kernel.dk>
Subject: [PATCH 13/20] aio: split out iocb copy from io_submit_one()
Date: Mon, 26 Nov 2018 09:45:37 -0700 [thread overview]
Message-ID: <20181126164544.5699-14-axboe@kernel.dk> (raw)
In-Reply-To: <20181126164544.5699-1-axboe@kernel.dk>
In preparation of handing in iocbs in a different fashion as well. Also
make it clear that the iocb being passed in isn't modified, by marking
it const throughout.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
fs/aio.c | 68 +++++++++++++++++++++++++++++++-------------------------
1 file changed, 38 insertions(+), 30 deletions(-)
diff --git a/fs/aio.c b/fs/aio.c
index e8457f9486e3..ba5758c854e8 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1414,7 +1414,7 @@ static void aio_complete_rw(struct kiocb *kiocb, long res, long res2)
aio_complete(iocb, res, res2);
}
-static int aio_prep_rw(struct kiocb *req, struct iocb *iocb)
+static int aio_prep_rw(struct kiocb *req, const struct iocb *iocb)
{
int ret;
@@ -1455,7 +1455,7 @@ static int aio_prep_rw(struct kiocb *req, struct iocb *iocb)
return ret;
}
-static int aio_setup_rw(int rw, struct iocb *iocb, struct iovec **iovec,
+static int aio_setup_rw(int rw, const struct iocb *iocb, struct iovec **iovec,
bool vectored, bool compat, struct iov_iter *iter)
{
void __user *buf = (void __user *)(uintptr_t)iocb->aio_buf;
@@ -1494,8 +1494,8 @@ static inline void aio_rw_done(struct kiocb *req, ssize_t ret)
}
}
-static ssize_t aio_read(struct kiocb *req, struct iocb *iocb, bool vectored,
- bool compat)
+static ssize_t aio_read(struct kiocb *req, const struct iocb *iocb,
+ bool vectored, bool compat)
{
struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
struct iov_iter iter;
@@ -1527,8 +1527,8 @@ static ssize_t aio_read(struct kiocb *req, struct iocb *iocb, bool vectored,
return ret;
}
-static ssize_t aio_write(struct kiocb *req, struct iocb *iocb, bool vectored,
- bool compat)
+static ssize_t aio_write(struct kiocb *req, const struct iocb *iocb,
+ bool vectored, bool compat)
{
struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
struct iov_iter iter;
@@ -1583,7 +1583,8 @@ static void aio_fsync_work(struct work_struct *work)
aio_complete(container_of(req, struct aio_kiocb, fsync), ret, 0);
}
-static int aio_fsync(struct fsync_iocb *req, struct iocb *iocb, bool datasync)
+static int aio_fsync(struct fsync_iocb *req, const struct iocb *iocb,
+ bool datasync)
{
if (unlikely(iocb->aio_buf || iocb->aio_offset || iocb->aio_nbytes ||
iocb->aio_rw_flags))
@@ -1711,7 +1712,7 @@ aio_poll_queue_proc(struct file *file, struct wait_queue_head *head,
add_wait_queue(head, &pt->iocb->poll.wait);
}
-static ssize_t aio_poll(struct aio_kiocb *aiocb, struct iocb *iocb)
+static ssize_t aio_poll(struct aio_kiocb *aiocb, const struct iocb *iocb)
{
struct kioctx *ctx = aiocb->ki_ctx;
struct poll_iocb *req = &aiocb->poll;
@@ -1783,27 +1784,23 @@ static ssize_t aio_poll(struct aio_kiocb *aiocb, struct iocb *iocb)
return 0;
}
-static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
- bool compat)
+static int __io_submit_one(struct kioctx *ctx, const struct iocb *iocb,
+ struct iocb __user *user_iocb, bool compat)
{
struct aio_kiocb *req;
- struct iocb iocb;
ssize_t ret;
- if (unlikely(copy_from_user(&iocb, user_iocb, sizeof(iocb))))
- return -EFAULT;
-
/* enforce forwards compatibility on users */
- if (unlikely(iocb.aio_reserved2)) {
+ if (unlikely(iocb->aio_reserved2)) {
pr_debug("EINVAL: reserve field set\n");
return -EINVAL;
}
/* prevent overflows */
if (unlikely(
- (iocb.aio_buf != (unsigned long)iocb.aio_buf) ||
- (iocb.aio_nbytes != (size_t)iocb.aio_nbytes) ||
- ((ssize_t)iocb.aio_nbytes < 0)
+ (iocb->aio_buf != (unsigned long)iocb->aio_buf) ||
+ (iocb->aio_nbytes != (size_t)iocb->aio_nbytes) ||
+ ((ssize_t)iocb->aio_nbytes < 0)
)) {
pr_debug("EINVAL: overflow check\n");
return -EINVAL;
@@ -1817,14 +1814,14 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
if (unlikely(!req))
goto out_put_reqs_available;
- if (iocb.aio_flags & IOCB_FLAG_RESFD) {
+ if (iocb->aio_flags & IOCB_FLAG_RESFD) {
/*
* If the IOCB_FLAG_RESFD flag of aio_flags is set, get an
* instance of the file* now. The file descriptor must be
* an eventfd() fd, and will be signaled for each completed
* event using the eventfd_signal() function.
*/
- req->ki_eventfd = eventfd_ctx_fdget((int) iocb.aio_resfd);
+ req->ki_eventfd = eventfd_ctx_fdget((int) iocb->aio_resfd);
if (IS_ERR(req->ki_eventfd)) {
ret = PTR_ERR(req->ki_eventfd);
req->ki_eventfd = NULL;
@@ -1839,32 +1836,32 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
}
req->ki_user_iocb = user_iocb;
- req->ki_user_data = iocb.aio_data;
+ req->ki_user_data = iocb->aio_data;
- switch (iocb.aio_lio_opcode) {
+ switch (iocb->aio_lio_opcode) {
case IOCB_CMD_PREAD:
- ret = aio_read(&req->rw, &iocb, false, compat);
+ ret = aio_read(&req->rw, iocb, false, compat);
break;
case IOCB_CMD_PWRITE:
- ret = aio_write(&req->rw, &iocb, false, compat);
+ ret = aio_write(&req->rw, iocb, false, compat);
break;
case IOCB_CMD_PREADV:
- ret = aio_read(&req->rw, &iocb, true, compat);
+ ret = aio_read(&req->rw, iocb, true, compat);
break;
case IOCB_CMD_PWRITEV:
- ret = aio_write(&req->rw, &iocb, true, compat);
+ ret = aio_write(&req->rw, iocb, true, compat);
break;
case IOCB_CMD_FSYNC:
- ret = aio_fsync(&req->fsync, &iocb, false);
+ ret = aio_fsync(&req->fsync, iocb, false);
break;
case IOCB_CMD_FDSYNC:
- ret = aio_fsync(&req->fsync, &iocb, true);
+ ret = aio_fsync(&req->fsync, iocb, true);
break;
case IOCB_CMD_POLL:
- ret = aio_poll(req, &iocb);
+ ret = aio_poll(req, iocb);
break;
default:
- pr_debug("invalid aio operation %d\n", iocb.aio_lio_opcode);
+ pr_debug("invalid aio operation %d\n", iocb->aio_lio_opcode);
ret = -EINVAL;
break;
}
@@ -1886,6 +1883,17 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
return ret;
}
+static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
+ bool compat)
+{
+ struct iocb iocb;
+
+ if (unlikely(copy_from_user(&iocb, user_iocb, sizeof(iocb))))
+ return -EFAULT;
+
+ return __io_submit_one(ctx, &iocb, user_iocb, compat);
+}
+
/*
* Plugging is meant to work with larger batches of IOs. If we don't
* have more than the below, then don't bother setting up a plug.
--
2.17.1
next prev parent reply other threads:[~2018-11-27 3:40 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-26 16:45 [PATCHSET v3 0/18] Support for polled aio Jens Axboe
2018-11-26 16:45 ` [PATCH 01/20] aio: fix failure to put the file pointer Jens Axboe
2018-11-27 8:16 ` Johannes Thumshirn
2018-11-26 16:45 ` [PATCH 02/20] aio: clear IOCB_HIPRI Jens Axboe
2018-11-27 8:18 ` Johannes Thumshirn
2018-11-26 16:45 ` [PATCH 03/20] fs: add an iopoll method to struct file_operations Jens Axboe
2018-11-27 8:24 ` Johannes Thumshirn
2018-11-26 16:45 ` [PATCH 04/20] block: wire up block device iopoll method Jens Axboe
2018-11-27 8:29 ` Johannes Thumshirn
2018-11-26 16:45 ` [PATCH 05/20] block: ensure that async polled IO is marked REQ_NOWAIT Jens Axboe
2018-11-26 16:45 ` [PATCH 06/20] iomap: wire up the iopoll method Jens Axboe
2018-11-26 16:45 ` [PATCH 07/20] iomap: ensure that async polled IO is marked REQ_NOWAIT Jens Axboe
2018-11-26 16:45 ` [PATCH 08/20] aio: use assigned completion handler Jens Axboe
2018-11-26 16:45 ` [PATCH 09/20] aio: separate out ring reservation from req allocation Jens Axboe
2018-11-26 16:45 ` [PATCH 10/20] aio: don't zero entire aio_kiocb aio_get_req() Jens Axboe
2018-11-26 16:45 ` [PATCH 11/20] aio: only use blk plugs for > 2 depth submissions Jens Axboe
2018-11-26 16:45 ` [PATCH 12/20] aio: use iocb_put() instead of open coding it Jens Axboe
2018-11-26 16:45 ` Jens Axboe [this message]
2018-11-26 16:45 ` [PATCH 14/20] aio: abstract out io_event filler helper Jens Axboe
2018-11-26 16:45 ` [PATCH 15/20] aio: add io_setup2() system call Jens Axboe
2018-11-26 16:45 ` [PATCH 16/20] aio: add support for having user mapped iocbs Jens Axboe
2018-11-26 16:45 ` [PATCH 17/20] aio: support for IO polling Jens Axboe
2018-11-27 9:53 ` Benny Halevy
2018-11-27 15:24 ` Jens Axboe
2018-11-28 9:33 ` Benny Halevy
2018-11-28 18:50 ` Jens Axboe
2018-11-29 14:10 ` Benny Halevy
2018-11-26 16:45 ` [PATCH 18/20] aio: add submission side request cache Jens Axboe
2018-11-26 16:45 ` [PATCH 19/20] fs: add fget_many() and fput_many() Jens Axboe
2018-11-26 16:45 ` [PATCH 20/20] aio: use fget/fput_many() for file references Jens Axboe
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