make get_file() return its argument

simplifies a bunch of callers...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/ia64/kernel/perfmon.c

@@ -2306,7 +2306,7 @@ pfm_smpl_buffer_alloc(struct task_struct *task, struct file *filp, pfm_context_t
 	 * partially initialize the vma for the sampling buffer
 	 */
 	vma->vm_mm	     = mm;
-	vma->vm_file	     = filp;
+	vma->vm_file	     = get_file(filp);
 	vma->vm_flags	     = VM_READ| VM_MAYREAD |VM_RESERVED;
 	vma->vm_page_prot    = PAGE_READONLY; /* XXX may need to change */
 
@@ -2345,8 +2345,6 @@ pfm_smpl_buffer_alloc(struct task_struct *task, struct file *filp, pfm_context_t
 		goto error;
 	}
 
-	get_file(filp);
-
 	/*
 	 * now insert the vma in the vm list for the process, must be
 	 * done with mmap lock held

drivers/base/dma-buf.c

@@ -460,8 +460,7 @@ int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma,
 	if (vma->vm_file)
 		fput(vma->vm_file);
 
-	vma->vm_file = dmabuf->file;
+	vma->vm_file = get_file(dmabuf->file);
-	get_file(vma->vm_file);
 
 	vma->vm_pgoff = pgoff;
 

drivers/staging/omapdrm/omap_gem.c

@@ -566,9 +566,8 @@ int omap_gem_mmap_obj(struct drm_gem_object *obj,
 		 * in particular in the case of mmap'd dmabufs)
 		 */
 		fput(vma->vm_file);
-		get_file(obj->filp);
 		vma->vm_pgoff = 0;
-		vma->vm_file  = obj->filp;
+		vma->vm_file  = get_file(obj->filp);
 
 		vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
 	}

drivers/tty/tty_io.c

@@ -1163,10 +1163,8 @@ ssize_t redirected_tty_write(struct file *file, const char __user *buf,
 	struct file *p = NULL;
 
 	spin_lock(&redirect_lock);
-	if (redirect) {
+	if (redirect)
-		get_file(redirect);
+		p = get_file(redirect);
-		p = redirect;
-	}
 	spin_unlock(&redirect_lock);
 
 	if (p) {
@@ -2246,8 +2244,7 @@ static int tioccons(struct file *file)
 		spin_unlock(&redirect_lock);
 		return -EBUSY;
 	}
-	get_file(file);
+	redirect = get_file(file);
-	redirect = file;
 	spin_unlock(&redirect_lock);
 	return 0;
 }

fs/autofs4/waitq.c

@@ -175,8 +175,7 @@ static void autofs4_notify_daemon(struct autofs_sb_info *sbi,
 		return;
 	}
 
-	pipe = sbi->pipe;
+	pipe = get_file(sbi->pipe);
-	get_file(pipe);
 
 	mutex_unlock(&sbi->wq_mutex);
 

fs/fuse/dev.c

@@ -148,8 +148,7 @@ static struct fuse_req *get_reserved_req(struct fuse_conn *fc,
 		if (ff->reserved_req) {
 			req = ff->reserved_req;
 			ff->reserved_req = NULL;
-			get_file(file);
+			req->stolen_file = get_file(file);
-			req->stolen_file = file;
 		}
 		spin_unlock(&fc->lock);
 	} while (!req);

fs/nfsd/nfs4state.c

@@ -2837,8 +2837,7 @@ static int nfs4_setlease(struct nfs4_delegation *dp, int flag)
 		return -ENOMEM;
 	}
 	fp->fi_lease = fl;
-	fp->fi_deleg_file = fl->fl_file;
+	fp->fi_deleg_file = get_file(fl->fl_file);
-	get_file(fp->fi_deleg_file);
 	atomic_set(&fp->fi_delegees, 1);
 	list_add(&dp->dl_perfile, &fp->fi_delegations);
 	return 0;

fs/proc/base.c

@@ -1979,8 +1979,7 @@ proc_map_files_readdir(struct file *filp, void *dirent, filldir_t filldir)
 				if (++pos <= filp->f_pos)
 					continue;
 
-				get_file(vma->vm_file);
+				info.file = get_file(vma->vm_file);
-				info.file = vma->vm_file;
 				info.len = snprintf(info.name,
 						sizeof(info.name), "%lx-%lx",
 						vma->vm_start, vma->vm_end);

fs/select.c

@@ -220,8 +220,7 @@ static void __pollwait(struct file *filp, wait_queue_head_t *wait_address,
 	struct poll_table_entry *entry = poll_get_entry(pwq);
 	if (!entry)
 		return;
-	get_file(filp);
+	entry->filp = get_file(filp);
-	entry->filp = filp;
 	entry->wait_address = wait_address;
 	entry->key = p->_key;
 	init_waitqueue_func_entry(&entry->wait, pollwake);

include/linux/fs.h

@@ -1074,7 +1074,11 @@ struct file_handle {
 	unsigned char f_handle[0];
 };
 
-#define get_file(x)	atomic_long_inc(&(x)->f_count)
+static inline struct file *get_file(struct file *f)
+{
+	atomic_long_inc(&f->f_count);
+	return f;
+}
 #define fput_atomic(x)	atomic_long_add_unless(&(x)->f_count, -1, 1)
 #define file_count(x)	atomic_long_read(&(x)->f_count)
 

mm/fremap.c

@@ -195,10 +195,9 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
 		 */
 		if (mapping_cap_account_dirty(mapping)) {
 			unsigned long addr;
-			struct file *file = vma->vm_file;
+			struct file *file = get_file(vma->vm_file);
 
 			flags &= MAP_NONBLOCK;
-			get_file(file);
 			addr = mmap_region(file, start, size,
 					flags, vma->vm_flags, pgoff);
 			fput(file);

mm/mmap.c

@@ -1301,8 +1301,7 @@ munmap_back:
 				goto free_vma;
 			correct_wcount = 1;
 		}
-		vma->vm_file = file;
+		vma->vm_file = get_file(file);
-		get_file(file);
 		error = file->f_op->mmap(file, vma);
 		if (error)
 			goto unmap_and_free_vma;

mm/nommu.c

@@ -1282,10 +1282,8 @@ unsigned long do_mmap_pgoff(struct file *file,
 	vma->vm_pgoff = pgoff;
 
 	if (file) {
-		region->vm_file = file;
+		region->vm_file = get_file(file);
-		get_file(file);
+		vma->vm_file = get_file(file);
-		vma->vm_file = file;
-		get_file(file);
 		if (vm_flags & VM_EXECUTABLE) {
 			added_exe_file_vma(current->mm);
 			vma->vm_mm = current->mm;

net/compat.c

@@ -301,8 +301,7 @@ void scm_detach_fds_compat(struct msghdr *kmsg, struct scm_cookie *scm)
 			break;
 		}
 		/* Bump the usage count and install the file. */
-		get_file(fp[i]);
+		fd_install(new_fd, get_file(fp[i]));
-		fd_install(new_fd, fp[i]);
 	}
 
 	if (i > 0) {

net/core/scm.c

@@ -281,11 +281,10 @@ void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm)
 			break;
 		}
 		/* Bump the usage count and install the file. */
-		get_file(fp[i]);
 		sock = sock_from_file(fp[i], &err);
 		if (sock)
 			sock_update_netprioidx(sock->sk, current);
-		fd_install(new_fd, fp[i]);
+		fd_install(new_fd, get_file(fp[i]));
 	}
 
 	if (i > 0)

security/selinux/hooks.c

@@ -2135,8 +2135,7 @@ static inline void flush_unauthorized_files(const struct cred *cred,
 	if (!IS_ERR(devnull)) {
 		/* replace all the matching ones with this */
 		do {
-			get_file(devnull);
+			replace_fd(n - 1, get_file(devnull), 0);
-			replace_fd(n - 1, devnull, 0);
 		} while ((n = iterate_fd(files, n, match_file, cred)) != 0);
 		fput(devnull);
 	} else {