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, 4 insertions, 4 deletions

diff --git a/fs/stat.c b/fs/stat.c
index 89ce1be56310..41e598376d7e 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -224,9 +224,9 @@ int vfs_fstat(int fd, struct kstat *stat)
 	int error;
 
 	f = fdget_raw(fd);
-	if (!f.file)
+	if (!fd_file(f))
 		return -EBADF;
-	error = vfs_getattr(&f.file->f_path, stat, STATX_BASIC_STATS, 0);
+	error = vfs_getattr(&fd_file(f)->f_path, stat, STATX_BASIC_STATS, 0);
 	fdput(f);
 	return error;
 }
@@ -277,9 +277,9 @@ static int vfs_statx_fd(int fd, int flags, struct kstat *stat,
 			  u32 request_mask)
 {
 	CLASS(fd_raw, f)(fd);
-	if (!f.file)
+	if (!fd_file(f))
 		return -EBADF;
-	return vfs_statx_path(&f.file->f_path, flags, stat, request_mask);
+	return vfs_statx_path(&fd_file(f)->f_path, flags, stat, request_mask);
 }
 
 /**