@@ -253,6 +253,7 @@ enum io_uring_op {
IORING_OP_FUTEX_WAIT,
IORING_OP_FUTEX_WAKE,
IORING_OP_FUTEX_WAITV,
+ IORING_OP_FTRUNCATE,
/* this goes last, obviously */
IORING_OP_LAST,
@@ -8,6 +8,6 @@ obj-$(CONFIG_IO_URING) += io_uring.o xattr.o nop.o fs.o splice.o \
statx.o net.o msg_ring.o timeout.o \
sqpoll.o fdinfo.o tctx.o poll.o \
cancel.o kbuf.o rsrc.o rw.o opdef.o \
- notif.o waitid.o
+ notif.o waitid.o truncate.o
obj-$(CONFIG_IO_WQ) += io-wq.o
obj-$(CONFIG_FUTEX) += futex.o
@@ -35,6 +35,7 @@
#include "rw.h"
#include "waitid.h"
#include "futex.h"
+#include "truncate.h"
static int io_no_issue(struct io_kiocb *req, unsigned int issue_flags)
{
@@ -469,6 +470,12 @@ const struct io_issue_def io_issue_defs[] = {
.prep = io_eopnotsupp_prep,
#endif
},
+ [IORING_OP_FTRUNCATE] = {
+ .needs_file = 1,
+ .hash_reg_file = 1,
+ .prep = io_ftruncate_prep,
+ .issue = io_ftruncate,
+ },
};
const struct io_cold_def io_cold_defs[] = {
@@ -704,6 +711,9 @@ const struct io_cold_def io_cold_defs[] = {
[IORING_OP_FUTEX_WAITV] = {
.name = "FUTEX_WAITV",
},
+ [IORING_OP_FTRUNCATE] = {
+ .name = "FTRUNCATE",
+ },
};
const char *io_uring_get_opcode(u8 opcode)
new file mode 100644
@@ -0,0 +1,48 @@
+// 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/syscalls.h>
+#include <linux/io_uring.h>
+
+#include <uapi/linux/io_uring.h>
+
+#include "../fs/internal.h"
+
+#include "io_uring.h"
+#include "truncate.h"
+
+struct io_ftrunc {
+ struct file *file;
+ loff_t len;
+};
+
+int io_ftruncate_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
+{
+ struct io_ftrunc *ft = io_kiocb_to_cmd(req, struct io_ftrunc);
+
+ if (sqe->rw_flags || sqe->addr || sqe->len || sqe->buf_index ||
+ sqe->splice_fd_in || sqe->addr3)
+ return -EINVAL;
+
+ ft->len = READ_ONCE(sqe->off);
+
+ req->flags |= REQ_F_FORCE_ASYNC;
+ return 0;
+}
+
+int io_ftruncate(struct io_kiocb *req, unsigned int issue_flags)
+{
+ struct io_ftrunc *ft = io_kiocb_to_cmd(req, struct io_ftrunc);
+ int ret;
+
+ WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
+
+ ret = do_ftruncate(req->file, ft->len);
+
+ io_req_set_res(req, ret, 0);
+ return IOU_OK;
+}
new file mode 100644
@@ -0,0 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
+
+int io_ftruncate_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
+int io_ftruncate(struct io_kiocb *req, unsigned int issue_flags);
Adds support for doing truncate through io_uring, eliminating the need for applications to roll their own thread pool or offload mechanism to be able to do non-blocking truncates. Signed-off-by: Tony Solomonik <tony.solomonik@gmail.com> --- include/uapi/linux/io_uring.h | 1 + io_uring/Makefile | 2 +- io_uring/opdef.c | 10 ++++++++ io_uring/truncate.c | 48 +++++++++++++++++++++++++++++++++++ io_uring/truncate.h | 4 +++ 5 files changed, 64 insertions(+), 1 deletion(-) create mode 100644 io_uring/truncate.c create mode 100644 io_uring/truncate.h