mirror of https://gitee.com/openkylin/linux.git
aio: move sanity checks and request allocation to io_submit_one()
makes for somewhat cleaner control flow in __io_submit_one() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
parent
fa0ca2aee3
commit
7316b49c2a
119
fs/aio.c
119
fs/aio.c
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@ -1777,35 +1777,12 @@ static int aio_poll(struct aio_kiocb *aiocb, const struct iocb *iocb)
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}
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static int __io_submit_one(struct kioctx *ctx, const struct iocb *iocb,
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struct iocb __user *user_iocb, bool compat)
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struct iocb __user *user_iocb, struct aio_kiocb *req,
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bool compat)
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{
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struct aio_kiocb *req;
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int ret;
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/* enforce forwards compatibility on users */
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if (unlikely(iocb->aio_reserved2)) {
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pr_debug("EINVAL: reserve field set\n");
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return -EINVAL;
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}
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/* prevent overflows */
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if (unlikely(
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(iocb->aio_buf != (unsigned long)iocb->aio_buf) ||
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(iocb->aio_nbytes != (size_t)iocb->aio_nbytes) ||
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((ssize_t)iocb->aio_nbytes < 0)
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)) {
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pr_debug("EINVAL: overflow check\n");
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return -EINVAL;
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}
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req = aio_get_req(ctx);
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if (unlikely(!req))
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return -EAGAIN;
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req->ki_filp = fget(iocb->aio_fildes);
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ret = -EBADF;
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if (unlikely(!req->ki_filp))
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goto out_put_req;
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return -EBADF;
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if (iocb->aio_flags & IOCB_FLAG_RESFD) {
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struct eventfd_ctx *eventfd;
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@ -1816,17 +1793,15 @@ static int __io_submit_one(struct kioctx *ctx, const struct iocb *iocb,
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* event using the eventfd_signal() function.
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*/
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eventfd = eventfd_ctx_fdget(iocb->aio_resfd);
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if (IS_ERR(eventfd)) {
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ret = PTR_ERR(eventfd);
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goto out_put_req;
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}
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if (IS_ERR(eventfd))
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return PTR_ERR(req->ki_eventfd);
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req->ki_eventfd = eventfd;
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}
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ret = put_user(KIOCB_KEY, &user_iocb->aio_key);
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if (unlikely(ret)) {
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if (unlikely(put_user(KIOCB_KEY, &user_iocb->aio_key))) {
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pr_debug("EFAULT: aio_key\n");
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goto out_put_req;
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return -EFAULT;
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}
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req->ki_res.obj = (u64)(unsigned long)user_iocb;
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@ -1836,58 +1811,70 @@ static int __io_submit_one(struct kioctx *ctx, const struct iocb *iocb,
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switch (iocb->aio_lio_opcode) {
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case IOCB_CMD_PREAD:
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ret = aio_read(&req->rw, iocb, false, compat);
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break;
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return aio_read(&req->rw, iocb, false, compat);
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case IOCB_CMD_PWRITE:
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ret = aio_write(&req->rw, iocb, false, compat);
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break;
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return aio_write(&req->rw, iocb, false, compat);
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case IOCB_CMD_PREADV:
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ret = aio_read(&req->rw, iocb, true, compat);
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break;
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return aio_read(&req->rw, iocb, true, compat);
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case IOCB_CMD_PWRITEV:
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ret = aio_write(&req->rw, iocb, true, compat);
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break;
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return aio_write(&req->rw, iocb, true, compat);
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case IOCB_CMD_FSYNC:
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ret = aio_fsync(&req->fsync, iocb, false);
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break;
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return aio_fsync(&req->fsync, iocb, false);
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case IOCB_CMD_FDSYNC:
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ret = aio_fsync(&req->fsync, iocb, true);
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break;
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return aio_fsync(&req->fsync, iocb, true);
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case IOCB_CMD_POLL:
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ret = aio_poll(req, iocb);
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break;
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return aio_poll(req, iocb);
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default:
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pr_debug("invalid aio operation %d\n", iocb->aio_lio_opcode);
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ret = -EINVAL;
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break;
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return -EINVAL;
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}
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/* Done with the synchronous reference */
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iocb_put(req);
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/*
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* If ret is 0, we'd either done aio_complete() ourselves or have
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* arranged for that to be done asynchronously. Anything non-zero
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* means that we need to destroy req ourselves.
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*/
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if (!ret)
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return 0;
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out_put_req:
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iocb_destroy(req);
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put_reqs_available(ctx, 1);
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return ret;
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}
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static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
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bool compat)
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{
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struct aio_kiocb *req;
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struct iocb iocb;
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int err;
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if (unlikely(copy_from_user(&iocb, user_iocb, sizeof(iocb))))
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return -EFAULT;
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return __io_submit_one(ctx, &iocb, user_iocb, compat);
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/* enforce forwards compatibility on users */
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if (unlikely(iocb.aio_reserved2)) {
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pr_debug("EINVAL: reserve field set\n");
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return -EINVAL;
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}
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/* prevent overflows */
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if (unlikely(
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(iocb.aio_buf != (unsigned long)iocb.aio_buf) ||
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(iocb.aio_nbytes != (size_t)iocb.aio_nbytes) ||
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((ssize_t)iocb.aio_nbytes < 0)
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)) {
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pr_debug("EINVAL: overflow check\n");
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return -EINVAL;
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}
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req = aio_get_req(ctx);
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if (unlikely(!req))
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return -EAGAIN;
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err = __io_submit_one(ctx, &iocb, user_iocb, req, compat);
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/* Done with the synchronous reference */
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iocb_put(req);
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/*
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* If err is 0, we'd either done aio_complete() ourselves or have
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* arranged for that to be done asynchronously. Anything non-zero
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* means that we need to destroy req ourselves.
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*/
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if (unlikely(err)) {
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iocb_destroy(req);
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put_reqs_available(ctx, 1);
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}
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return err;
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}
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/* sys_io_submit:
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