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, 25 insertions, 25 deletions

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index a7cbd69efbef..34fa0bd8bb11 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -1085,20 +1085,20 @@ static int do_mq_timedsend(mqd_t mqdes, const char __user *u_msg_ptr,
 	audit_mq_sendrecv(mqdes, msg_len, msg_prio, ts);
 
 	f = fdget(mqdes);
-	if (unlikely(!f.file)) {
+	if (unlikely(!fd_file(f))) {
 		ret = -EBADF;
 		goto out;
 	}
 
-	inode = file_inode(f.file);
-	if (unlikely(f.file->f_op != &mqueue_file_operations)) {
+	inode = file_inode(fd_file(f));
+	if (unlikely(fd_file(f)->f_op != &mqueue_file_operations)) {
 		ret = -EBADF;
 		goto out_fput;
 	}
 	info = MQUEUE_I(inode);
-	audit_file(f.file);
+	audit_file(fd_file(f));
 
-	if (unlikely(!(f.file->f_mode & FMODE_WRITE))) {
+	if (unlikely(!(fd_file(f)->f_mode & FMODE_WRITE))) {
 		ret = -EBADF;
 		goto out_fput;
 	}
@@ -1138,7 +1138,7 @@ static int do_mq_timedsend(mqd_t mqdes, const char __user *u_msg_ptr,
 	}
 
 	if (info->attr.mq_curmsgs == info->attr.mq_maxmsg) {
-		if (f.file->f_flags & O_NONBLOCK) {
+		if (fd_file(f)->f_flags & O_NONBLOCK) {
 			ret = -EAGAIN;
 		} else {
 			wait.task = current;
@@ -1199,20 +1199,20 @@ static int do_mq_timedreceive(mqd_t mqdes, char __user *u_msg_ptr,
 	audit_mq_sendrecv(mqdes, msg_len, 0, ts);
 
 	f = fdget(mqdes);
-	if (unlikely(!f.file)) {
+	if (unlikely(!fd_file(f))) {
 		ret = -EBADF;
 		goto out;
 	}
 
-	inode = file_inode(f.file);
-	if (unlikely(f.file->f_op != &mqueue_file_operations)) {
+	inode = file_inode(fd_file(f));
+	if (unlikely(fd_file(f)->f_op != &mqueue_file_operations)) {
 		ret = -EBADF;
 		goto out_fput;
 	}
 	info = MQUEUE_I(inode);
-	audit_file(f.file);
+	audit_file(fd_file(f));
 
-	if (unlikely(!(f.file->f_mode & FMODE_READ))) {
+	if (unlikely(!(fd_file(f)->f_mode & FMODE_READ))) {
 		ret = -EBADF;
 		goto out_fput;
 	}
@@ -1242,7 +1242,7 @@ static int do_mq_timedreceive(mqd_t mqdes, char __user *u_msg_ptr,
 	}
 
 	if (info->attr.mq_curmsgs == 0) {
-		if (f.file->f_flags & O_NONBLOCK) {
+		if (fd_file(f)->f_flags & O_NONBLOCK) {
 			spin_unlock(&info->lock);
 			ret = -EAGAIN;
 		} else {
@@ -1356,11 +1356,11 @@ static int do_mq_notify(mqd_t mqdes, const struct sigevent *notification)
 			/* and attach it to the socket */
 retry:
 			f = fdget(notification->sigev_signo);
-			if (!f.file) {
+			if (!fd_file(f)) {
 				ret = -EBADF;
 				goto out;
 			}
-			sock = netlink_getsockbyfilp(f.file);
+			sock = netlink_getsockbyfilp(fd_file(f));
 			fdput(f);
 			if (IS_ERR(sock)) {
 				ret = PTR_ERR(sock);
@@ -1379,13 +1379,13 @@ retry:
 	}
 
 	f = fdget(mqdes);
-	if (!f.file) {
+	if (!fd_file(f)) {
 		ret = -EBADF;
 		goto out;
 	}
 
-	inode = file_inode(f.file);
-	if (unlikely(f.file->f_op != &mqueue_file_operations)) {
+	inode = file_inode(fd_file(f));
+	if (unlikely(fd_file(f)->f_op != &mqueue_file_operations)) {
 		ret = -EBADF;
 		goto out_fput;
 	}
@@ -1460,31 +1460,31 @@ static int do_mq_getsetattr(int mqdes, struct mq_attr *new, struct mq_attr *old)
 		return -EINVAL;
 
 	f = fdget(mqdes);
-	if (!f.file)
+	if (!fd_file(f))
 		return -EBADF;
 
-	if (unlikely(f.file->f_op != &mqueue_file_operations)) {
+	if (unlikely(fd_file(f)->f_op != &mqueue_file_operations)) {
 		fdput(f);
 		return -EBADF;
 	}
 
-	inode = file_inode(f.file);
+	inode = file_inode(fd_file(f));
 	info = MQUEUE_I(inode);
 
 	spin_lock(&info->lock);
 
 	if (old) {
 		*old = info->attr;
-		old->mq_flags = f.file->f_flags & O_NONBLOCK;
+		old->mq_flags = fd_file(f)->f_flags & O_NONBLOCK;
 	}
 	if (new) {
 		audit_mq_getsetattr(mqdes, new);
-		spin_lock(&f.file->f_lock);
+		spin_lock(&fd_file(f)->f_lock);
 		if (new->mq_flags & O_NONBLOCK)
-			f.file->f_flags |= O_NONBLOCK;
+			fd_file(f)->f_flags |= O_NONBLOCK;
 		else
-			f.file->f_flags &= ~O_NONBLOCK;
-		spin_unlock(&f.file->f_lock);
+			fd_file(f)->f_flags &= ~O_NONBLOCK;
+		spin_unlock(&fd_file(f)->f_lock);
 
 		inode_set_atime_to_ts(inode, inode_set_ctime_current(inode));
 	}