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-rw-r--r--io_uring/advise.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/io_uring/advise.c b/io_uring/advise.c
new file mode 100644
index 000000000..449c6f146
--- /dev/null
+++ b/io_uring/advise.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/namei.h>
+#include <linux/io_uring.h>
+
+#include <uapi/linux/fadvise.h>
+#include <uapi/linux/io_uring.h>
+
+#include "io_uring.h"
+#include "advise.h"
+
+struct io_fadvise {
+ struct file *file;
+ u64 offset;
+ u32 len;
+ u32 advice;
+};
+
+struct io_madvise {
+ struct file *file;
+ u64 addr;
+ u32 len;
+ u32 advice;
+};
+
+int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
+ struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise);
+
+ if (sqe->buf_index || sqe->off || sqe->splice_fd_in)
+ return -EINVAL;
+
+ ma->addr = READ_ONCE(sqe->addr);
+ ma->len = READ_ONCE(sqe->len);
+ ma->advice = READ_ONCE(sqe->fadvise_advice);
+ return 0;
+#else
+ return -EOPNOTSUPP;
+#endif
+}
+
+int io_madvise(struct io_kiocb *req, unsigned int issue_flags)
+{
+#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
+ struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise);
+ int ret;
+
+ if (issue_flags & IO_URING_F_NONBLOCK)
+ return -EAGAIN;
+
+ ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice);
+ io_req_set_res(req, ret, 0);
+ return IOU_OK;
+#else
+ return -EOPNOTSUPP;
+#endif
+}
+
+int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+ struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
+
+ if (sqe->buf_index || sqe->addr || sqe->splice_fd_in)
+ return -EINVAL;
+
+ fa->offset = READ_ONCE(sqe->off);
+ fa->len = READ_ONCE(sqe->len);
+ fa->advice = READ_ONCE(sqe->fadvise_advice);
+ return 0;
+}
+
+int io_fadvise(struct io_kiocb *req, unsigned int issue_flags)
+{
+ struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
+ int ret;
+
+ if (issue_flags & IO_URING_F_NONBLOCK) {
+ switch (fa->advice) {
+ case POSIX_FADV_NORMAL:
+ case POSIX_FADV_RANDOM:
+ case POSIX_FADV_SEQUENTIAL:
+ break;
+ default:
+ return -EAGAIN;
+ }
+ }
+
+ ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice);
+ if (ret < 0)
+ req_set_fail(req);
+ io_req_set_res(req, ret, 0);
+ return IOU_OK;
+}