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io_uring: add support for IORING_OP_RENAMEAT

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IORING_OP_RENAMEAT behaves like renameat2(), and takes the same flags
etc.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-09-28 14:23:58 -06:00
parent e886663cfd
commit 80a261fd00
2 changed files with 72 additions and 0 deletions
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70
fs/io_uring.c
View File

@ -546,6 +546,15 @@ struct io_shutdown {
int how;
};
struct io_rename {
struct file *file;
int old_dfd;
int new_dfd;
struct filename *oldpath;
struct filename *newpath;
int flags;
};
struct io_completion {
struct file *file;
struct list_head list;
@ -673,6 +682,7 @@ struct io_kiocb {
struct io_provide_buf pbuf;
struct io_statx statx;
struct io_shutdown shutdown;
struct io_rename rename;
/* use only after cleaning per-op data, see io_clean_op() */
struct io_completion compl;
};
@ -943,6 +953,10 @@ static const struct io_op_def io_op_defs[] = {
[IORING_OP_SHUTDOWN] = {
.needs_file = 1,
},
[IORING_OP_RENAMEAT] = {
.work_flags = IO_WQ_WORK_MM | IO_WQ_WORK_FILES |
IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG,
},
};
enum io_mem_account {
@ -3645,6 +3659,53 @@ out_free:
return ret;
}
static int io_renameat_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
struct io_rename *ren = &req->rename;
const char __user *oldf, *newf;
if (unlikely(req->flags & REQ_F_FIXED_FILE))
return -EBADF;
ren->old_dfd = READ_ONCE(sqe->fd);
oldf = u64_to_user_ptr(READ_ONCE(sqe->addr));
newf = u64_to_user_ptr(READ_ONCE(sqe->addr2));
ren->new_dfd = READ_ONCE(sqe->len);
ren->flags = READ_ONCE(sqe->rename_flags);
ren->oldpath = getname(oldf);
if (IS_ERR(ren->oldpath))
return PTR_ERR(ren->oldpath);
ren->newpath = getname(newf);
if (IS_ERR(ren->newpath)) {
putname(ren->oldpath);
return PTR_ERR(ren->newpath);
}
req->flags |= REQ_F_NEED_CLEANUP;
return 0;
}
static int io_renameat(struct io_kiocb *req, bool force_nonblock)
{
struct io_rename *ren = &req->rename;
int ret;
if (force_nonblock)
return -EAGAIN;
ret = do_renameat2(ren->old_dfd, ren->oldpath, ren->new_dfd,
ren->newpath, ren->flags);
req->flags &= ~REQ_F_NEED_CLEANUP;
if (ret < 0)
req_set_fail_links(req);
io_req_complete(req, ret);
return 0;
}
static int io_shutdown_prep(struct io_kiocb *req,
const struct io_uring_sqe *sqe)
{
@ -5869,6 +5930,8 @@ static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
return io_tee_prep(req, sqe);
case IORING_OP_SHUTDOWN:
return io_shutdown_prep(req, sqe);
case IORING_OP_RENAMEAT:
return io_renameat_prep(req, sqe);
}
printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n",
@ -6006,6 +6069,10 @@ static void __io_clean_op(struct io_kiocb *req)
if (req->open.filename)
putname(req->open.filename);
break;
case IORING_OP_RENAMEAT:
putname(req->rename.oldpath);
putname(req->rename.newpath);
break;
}
req->flags &= ~REQ_F_NEED_CLEANUP;
}
@ -6115,6 +6182,9 @@ static int io_issue_sqe(struct io_kiocb *req, bool force_nonblock,
case IORING_OP_SHUTDOWN:
ret = io_shutdown(req, force_nonblock);
break;
case IORING_OP_RENAMEAT:
ret = io_renameat(req, force_nonblock);
break;
default:
ret = -EINVAL;
break;

2
include/uapi/linux/io_uring.h
View File

@ -42,6 +42,7 @@ struct io_uring_sqe {
__u32 statx_flags;
__u32 fadvise_advice;
__u32 splice_flags;
__u32 rename_flags;
};
__u64 user_data; /* data to be passed back at completion time */
union {
@ -133,6 +134,7 @@ enum {
IORING_OP_REMOVE_BUFFERS,
IORING_OP_TEE,
IORING_OP_SHUTDOWN,
IORING_OP_RENAMEAT,
/* this goes last, obviously */
IORING_OP_LAST,