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, 3 insertions, 3 deletions

diff --git a/drivers/virt/acrn/irqfd.c b/drivers/virt/acrn/irqfd.c
index d4ad211dce7a..9994d818bb7e 100644
--- a/drivers/virt/acrn/irqfd.c
+++ b/drivers/virt/acrn/irqfd.c
@@ -125,12 +125,12 @@ static int acrn_irqfd_assign(struct acrn_vm *vm, struct acrn_irqfd *args)
 	INIT_WORK(&irqfd->shutdown, hsm_irqfd_shutdown_work);
 
 	f = fdget(args->fd);
-	if (!f.file) {
+	if (!fd_file(f)) {
 		ret = -EBADF;
 		goto out;
 	}
 
-	eventfd = eventfd_ctx_fileget(f.file);
+	eventfd = eventfd_ctx_fileget(fd_file(f));
 	if (IS_ERR(eventfd)) {
 		ret = PTR_ERR(eventfd);
 		goto fail;
@@ -157,7 +157,7 @@ static int acrn_irqfd_assign(struct acrn_vm *vm, struct acrn_irqfd *args)
 	mutex_unlock(&vm->irqfds_lock);
 
 	/* Check the pending event in this stage */
-	events = vfs_poll(f.file, &irqfd->pt);
+	events = vfs_poll(fd_file(f), &irqfd->pt);
 
 	if (events & EPOLLIN)
 		acrn_irqfd_inject(irqfd);