io_uring: add io_statx structure

to #28736503

commit 1d9e1288039a47dc1189c3c1fed5cf3c215e94b7 upstream

Separate statx data from open in io_kiocb. No functional changes.
Signed-off-by: NBijan Mottahedeh <bijan.mottahedeh@oracle.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>
Signed-off-by: NXiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
Acked-by: NJoseph Qi <joseph.qi@linux.alibaba.com>

fs/io_uring.c

@@ -415,11 +415,7 @@ struct io_sr_msg {
 struct io_open {
 	struct file			*file;
 	int				dfd;
-	union {
-		unsigned		mask;
-	};
 	struct filename			*filename;
-	struct statx __user		*buffer;
 	struct open_how			how;
 	unsigned long			nofile;
 };
@@ -471,6 +467,15 @@ struct io_provide_buf {
 	__u16				bid;
 };
 
+struct io_statx {
+	struct file			*file;
+	int				dfd;
+	unsigned int			mask;
+	unsigned int			flags;
+	struct filename			*filename;
+	struct statx __user		*buffer;
+};
+
 struct io_async_connect {
 	struct sockaddr_storage		address;
 };
@@ -612,6 +617,7 @@ struct io_kiocb {
 		struct io_epoll		epoll;
 		struct io_splice	splice;
 		struct io_provide_buf	pbuf;
+		struct io_statx		statx;
 	};
 
 	struct io_async_ctx		*io;
@@ -3370,19 +3376,19 @@ static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	if (req->flags & REQ_F_NEED_CLEANUP)
 		return 0;
 
-	req->open.dfd = READ_ONCE(sqe->fd);
-	req->open.mask = READ_ONCE(sqe->len);
+	req->statx.dfd = READ_ONCE(sqe->fd);
+	req->statx.mask = READ_ONCE(sqe->len);
 	fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
-	req->open.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2));
-	req->open.how.flags = READ_ONCE(sqe->statx_flags);
+	req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2));
+	req->statx.flags = READ_ONCE(sqe->statx_flags);
 
-	if (vfs_stat_set_lookup_flags(&lookup_flags, req->open.how.flags))
+	if (vfs_stat_set_lookup_flags(&lookup_flags, req->statx.flags))
 		return -EINVAL;
 
-	req->open.filename = getname_flags(fname, lookup_flags, NULL);
-	if (IS_ERR(req->open.filename)) {
-		ret = PTR_ERR(req->open.filename);
-		req->open.filename = NULL;
+	req->statx.filename = getname_flags(fname, lookup_flags, NULL);
+	if (IS_ERR(req->statx.filename)) {
+		ret = PTR_ERR(req->statx.filename);
+		req->statx.filename = NULL;
 		return ret;
 	}
 
@@ -3392,7 +3398,7 @@ static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 
 static int io_statx(struct io_kiocb *req, bool force_nonblock)
 {
-	struct io_open *ctx = &req->open;
+	struct io_statx *ctx = &req->statx;
 	unsigned lookup_flags;
 	struct path path;
 	struct kstat stat;
@@ -3405,7 +3411,7 @@ static int io_statx(struct io_kiocb *req, bool force_nonblock)
 		return -EAGAIN;
 	}
 
-	if (vfs_stat_set_lookup_flags(&lookup_flags, ctx->how.flags))
+	if (vfs_stat_set_lookup_flags(&lookup_flags, ctx->flags))
 		return -EINVAL;
 
 retry:
@@ -3417,7 +3423,7 @@ static int io_statx(struct io_kiocb *req, bool force_nonblock)
 	if (ret)
 		goto err;
 
-	ret = vfs_getattr(&path, &stat, ctx->mask, ctx->how.flags);
+	ret = vfs_getattr(&path, &stat, ctx->mask, ctx->flags);
 	path_put(&path);
 	if (retry_estale(ret, lookup_flags)) {
 		lookup_flags |= LOOKUP_REVAL;