introduce fd_file(), convert all accessors to it.

	For any changes of struct fd representation we need to
turn existing accesses to fields into calls of wrappers.
Accesses to struct fd::flags are very few (3 in linux/file.h,
1 in net/socket.c, 3 in fs/overlayfs/file.c and 3 more in
explicit initializers).
	Those can be dealt with in the commit converting to
new layout; accesses to struct fd::file are too many for that.
	This commit converts (almost) all of f.file to
fd_file(f).  It's not entirely mechanical ('file' is used as
a member name more than just in struct fd) and it does not
even attempt to distinguish the uses in pointer context from
those in boolean context; the latter will be eventually turned
into a separate helper (fd_empty()).

	NOTE: mass conversion to fd_empty(), tempting as it
might be, is a bad idea; better do that piecewise in commit
that convert from fdget...() to CLASS(...).

[conflicts in fs/fhandle.c, kernel/bpf/syscall.c, mm/memcontrol.c
caught by git; fs/stat.c one got caught by git grep]
[fs/xattr.c conflict]

Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 5 insertions, 5 deletions

diff --git a/io_uring/sqpoll.c b/io_uring/sqpoll.c
index b3722e5275e7..ffa7d341bd95 100644
--- a/io_uring/sqpoll.c
+++ b/io_uring/sqpoll.c
@@ -108,14 +108,14 @@ static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p)
 	struct fd f;
 
 	f = fdget(p->wq_fd);
-	if (!f.file)
+	if (!fd_file(f))
 		return ERR_PTR(-ENXIO);
-	if (!io_is_uring_fops(f.file)) {
+	if (!io_is_uring_fops(fd_file(f))) {
 		fdput(f);
 		return ERR_PTR(-EINVAL);
 	}
 
-	ctx_attach = f.file->private_data;
+	ctx_attach = fd_file(f)->private_data;
 	sqd = ctx_attach->sq_data;
 	if (!sqd) {
 		fdput(f);
@@ -418,9 +418,9 @@ __cold int io_sq_offload_create(struct io_ring_ctx *ctx,
 		struct fd f;
 
 		f = fdget(p->wq_fd);
-		if (!f.file)
+		if (!fd_file(f))
 			return -ENXIO;
-		if (!io_is_uring_fops(f.file)) {
+		if (!io_is_uring_fops(fd_file(f))) {
 			fdput(f);
 			return -EINVAL;
 		}