Package: linux / 3.16.56-1+deb8u1

features/all/aufs3/aufs3-mmap.patch Patch series | download
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From: J. R. Okajima <hooanon05@yahoo.co.jp>
Date: Thu Aug 7 21:42:20 2014 +0900
Subject: aufs3.16 mmap patch
Origin: http://sourceforge.net/p/aufs/aufs3-standalone/ci/888949daf96bf7e2b857dc38e22029513f94d4ae/tree/
Bug-Debian: https://bugs.debian.org/541828

Patch headers added by debian/patches/features/all/aufs3/gen-patch

aufs3.16 mmap patch

--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2470,7 +2470,7 @@ int block_page_mkwrite(struct vm_area_st
 	 * Update file times before taking page lock. We may end up failing the
 	 * fault so this update may be superfluous but who really cares...
 	 */
-	file_update_time(vma->vm_file);
+	vma_file_update_time(vma);
 
 	ret = __block_page_mkwrite(vma, vmf, get_block);
 	sb_end_pagefault(sb);
--- a/fs/proc/nommu.c
+++ b/fs/proc/nommu.c
@@ -45,7 +45,10 @@ static int nommu_region_show(struct seq_
 	file = region->vm_file;
 
 	if (file) {
-		struct inode *inode = file_inode(region->vm_file);
+		struct inode *inode;
+
+		file = vmr_pr_or_file(region);
+		inode = file_inode(file);
 		dev = inode->i_sb->s_dev;
 		ino = inode->i_ino;
 	}
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -265,7 +265,10 @@ show_map_vma(struct seq_file *m, struct
 	const char *name = NULL;
 
 	if (file) {
-		struct inode *inode = file_inode(vma->vm_file);
+		struct inode *inode;
+
+		file = vma_pr_or_file(vma);
+		inode = file_inode(file);
 		dev = inode->i_sb->s_dev;
 		ino = inode->i_ino;
 		pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
@@ -1390,7 +1393,7 @@ static int show_numa_map(struct seq_file
 	struct proc_maps_private *proc_priv = &numa_priv->proc_maps;
 	struct vm_area_struct *vma = v;
 	struct numa_maps *md = &numa_priv->md;
-	struct file *file = vma->vm_file;
+	struct file *file = vma_pr_or_file(vma);
 	struct task_struct *task = proc_priv->task;
 	struct mm_struct *mm = vma->vm_mm;
 	struct mm_walk walk = {};
--- a/fs/proc/task_nommu.c
+++ b/fs/proc/task_nommu.c
@@ -141,7 +141,10 @@ static int nommu_vma_show(struct seq_fil
 	file = vma->vm_file;
 
 	if (file) {
-		struct inode *inode = file_inode(vma->vm_file);
+		struct inode *inode;
+
+		file = vma_pr_or_file(file);
+		inode = file_inode(file);
 		dev = inode->i_sb->s_dev;
 		ino = inode->i_ino;
 		pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT;
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1187,6 +1187,28 @@ static inline int fixup_user_fault(struc
 }
 #endif
 
+#ifdef CONFIG_MMU
+extern void vma_do_file_update_time(struct vm_area_struct *, const char[], int);
+extern struct file *vma_do_pr_or_file(struct vm_area_struct *, const char[],
+				      int);
+extern void vma_do_get_file(struct vm_area_struct *, const char[], int);
+extern void vma_do_fput(struct vm_area_struct *, const char[], int);
+
+#define vma_file_update_time(vma)	vma_do_file_update_time(vma, __func__, \
+								__LINE__)
+#define vma_pr_or_file(vma)		vma_do_pr_or_file(vma, __func__, \
+							  __LINE__)
+#define vma_get_file(vma)		vma_do_get_file(vma, __func__, __LINE__)
+#define vma_fput(vma)			vma_do_fput(vma, __func__, __LINE__)
+#else
+extern struct file *vmr_do_pr_or_file(struct vm_region *, const char[], int);
+extern void vmr_do_fput(struct vm_region *, const char[], int);
+
+#define vmr_pr_or_file(region)		vmr_do_pr_or_file(region, __func__, \
+							  __LINE__)
+#define vmr_fput(region)		vmr_do_fput(region, __func__, __LINE__)
+#endif /* CONFIG_MMU */
+
 extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
 extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
 		void *buf, int len, int write);
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -232,6 +232,7 @@ struct vm_region {
 	unsigned long	vm_top;		/* region allocated to here */
 	unsigned long	vm_pgoff;	/* the offset in vm_file corresponding to vm_start */
 	struct file	*vm_file;	/* the backing file or NULL */
+	struct file	*vm_prfile;	/* the virtual backing file or NULL */
 
 	int		vm_usage;	/* region usage count (access under nommu_region_sem) */
 	bool		vm_icache_flushed : 1; /* true if the icache has been flushed for
@@ -300,6 +301,7 @@ struct vm_area_struct {
 	unsigned long vm_pgoff;		/* Offset (within vm_file) in PAGE_SIZE
 					   units, *not* PAGE_CACHE_SIZE */
 	struct file * vm_file;		/* File we map to (can be NULL). */
+	struct file *vm_prfile;		/* shadow of vm_file */
 	void * vm_private_data;		/* was vm_pte (shared mem) */
 
 #ifndef CONFIG_MMU
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -416,7 +416,7 @@ static int dup_mmap(struct mm_struct *mm
 			struct inode *inode = file_inode(file);
 			struct address_space *mapping = file->f_mapping;
 
-			get_file(file);
+			vma_get_file(tmp);
 			if (tmp->vm_flags & VM_DENYWRITE)
 				atomic_dec(&inode->i_writecount);
 			mutex_lock(&mapping->i_mmap_mutex);
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -18,7 +18,7 @@ obj-y			:= filemap.o mempool.o oom_kill.
 			   mm_init.o mmu_context.o percpu.o slab_common.o \
 			   compaction.o balloon_compaction.o vmacache.o \
 			   interval_tree.o list_lru.o workingset.o \
-			   iov_iter.o $(mmu-y)
+			   iov_iter.o prfile.o $(mmu-y)
 
 obj-y += init-mm.o
 
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2036,7 +2036,7 @@ int filemap_page_mkwrite(struct vm_area_
 	int ret = VM_FAULT_LOCKED;
 
 	sb_start_pagefault(inode->i_sb);
-	file_update_time(vma->vm_file);
+	vma_file_update_time(vma);
 	lock_page(page);
 	if (page->mapping != inode->i_mapping) {
 		unlock_page(page);
--- a/mm/fremap.c
+++ b/mm/fremap.c
@@ -224,16 +224,28 @@ get_write_lock:
 		 */
 		if (mapping_cap_account_dirty(mapping)) {
 			unsigned long addr;
-			struct file *file = get_file(vma->vm_file);
+			struct file *file = vma->vm_file,
+				*prfile = vma->vm_prfile;
+
 			/* mmap_region may free vma; grab the info now */
 			vm_flags = vma->vm_flags;
 
+			vma_get_file(vma);
 			addr = mmap_region(file, start, size, vm_flags, pgoff);
-			fput(file);
+			vma_fput(vma);
 			if (IS_ERR_VALUE(addr)) {
 				err = addr;
 			} else {
 				BUG_ON(addr != start);
+				if (prfile) {
+					struct vm_area_struct *new_vma;
+
+					new_vma = find_vma(mm, addr);
+					if (!new_vma->vm_prfile)
+						new_vma->vm_prfile = prfile;
+					if (new_vma != vma)
+						get_file(prfile);
+				}
 				err = 0;
 			}
 			goto out_freed;
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -327,12 +327,12 @@ static long madvise_remove(struct vm_are
 	 * vma's reference to the file) can go away as soon as we drop
 	 * mmap_sem.
 	 */
-	get_file(f);
+	vma_get_file(vma);
 	up_read(&current->mm->mmap_sem);
 	error = do_fallocate(f,
 				FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
 				offset, end - start);
-	fput(f);
+	vma_fput(vma);
 	down_read(&current->mm->mmap_sem);
 	return error;
 }
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2168,7 +2168,7 @@ reuse:
 
 			/* file_update_time outside page_lock */
 			if (vma->vm_file)
-				file_update_time(vma->vm_file);
+				vma_file_update_time(vma);
 		}
 		put_page(dirty_page);
 		if (page_mkwrite) {
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -253,7 +253,7 @@ static struct vm_area_struct *remove_vma
 	if (vma->vm_ops && vma->vm_ops->close)
 		vma->vm_ops->close(vma);
 	if (vma->vm_file)
-		fput(vma->vm_file);
+		vma_fput(vma);
 	mpol_put(vma_policy(vma));
 	kmem_cache_free(vm_area_cachep, vma);
 	return next;
@@ -868,7 +868,7 @@ again:			remove_next = 1 + (end > next->
 	if (remove_next) {
 		if (file) {
 			uprobe_munmap(next, next->vm_start, next->vm_end);
-			fput(file);
+			vma_fput(vma);
 		}
 		if (next->anon_vma)
 			anon_vma_merge(vma, next);
@@ -1648,8 +1648,8 @@ out:
 unmap_and_free_vma:
 	if (vm_flags & VM_DENYWRITE)
 		allow_write_access(file);
+	vma_fput(vma);
 	vma->vm_file = NULL;
-	fput(file);
 
 	/* Undo any partial mapping done by a device driver. */
 	unmap_region(mm, vma, prev, vma->vm_start, vma->vm_end);
@@ -2443,7 +2443,7 @@ static int __split_vma(struct mm_struct
 		goto out_free_mpol;
 
 	if (new->vm_file)
-		get_file(new->vm_file);
+		vma_get_file(new);
 
 	if (new->vm_ops && new->vm_ops->open)
 		new->vm_ops->open(new);
@@ -2462,7 +2462,7 @@ static int __split_vma(struct mm_struct
 	if (new->vm_ops && new->vm_ops->close)
 		new->vm_ops->close(new);
 	if (new->vm_file)
-		fput(new->vm_file);
+		vma_fput(new);
 	unlink_anon_vmas(new);
  out_free_mpol:
 	mpol_put(vma_policy(new));
@@ -2851,7 +2851,7 @@ struct vm_area_struct *copy_vma(struct v
 			if (anon_vma_clone(new_vma, vma))
 				goto out_free_mempol;
 			if (new_vma->vm_file)
-				get_file(new_vma->vm_file);
+				vma_get_file(new_vma);
 			if (new_vma->vm_ops && new_vma->vm_ops->open)
 				new_vma->vm_ops->open(new_vma);
 			vma_link(mm, new_vma, prev, rb_link, rb_parent);
--- a/mm/msync.c
+++ b/mm/msync.c
@@ -84,13 +84,13 @@ SYSCALL_DEFINE3(msync, unsigned long, st
 		start = vma->vm_end;
 		if ((flags & MS_SYNC) && file &&
 				(vma->vm_flags & VM_SHARED)) {
-			get_file(file);
+			vma_get_file(vma);
 			up_read(&mm->mmap_sem);
 			if (vma->vm_flags & VM_NONLINEAR)
 				error = vfs_fsync(file, 1);
 			else
 				error = vfs_fsync_range(file, fstart, fend, 1);
-			fput(file);
+			vma_fput(vma);
 			if (error || start >= end)
 				goto out;
 			down_read(&mm->mmap_sem);
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -658,7 +658,7 @@ static void __put_nommu_region(struct vm
 		up_write(&nommu_region_sem);
 
 		if (region->vm_file)
-			fput(region->vm_file);
+			vmr_fput(region);
 
 		/* IO memory and memory shared directly out of the pagecache
 		 * from ramfs/tmpfs mustn't be released here */
@@ -823,7 +823,7 @@ static void delete_vma(struct mm_struct
 	if (vma->vm_ops && vma->vm_ops->close)
 		vma->vm_ops->close(vma);
 	if (vma->vm_file)
-		fput(vma->vm_file);
+		vma_fput(vma);
 	put_nommu_region(vma->vm_region);
 	kmem_cache_free(vm_area_cachep, vma);
 }
@@ -1385,7 +1385,7 @@ unsigned long do_mmap_pgoff(struct file
 					goto error_just_free;
 				}
 			}
-			fput(region->vm_file);
+			vmr_fput(region);
 			kmem_cache_free(vm_region_jar, region);
 			region = pregion;
 			result = start;
@@ -1461,10 +1461,10 @@ error_just_free:
 	up_write(&nommu_region_sem);
 error:
 	if (region->vm_file)
-		fput(region->vm_file);
+		vmr_fput(region);
 	kmem_cache_free(vm_region_jar, region);
 	if (vma->vm_file)
-		fput(vma->vm_file);
+		vma_fput(vma);
 	kmem_cache_free(vm_area_cachep, vma);
 	kleave(" = %d", ret);
 	return ret;
--- /dev/null
+++ b/mm/prfile.c
@@ -0,0 +1,86 @@
+/*
+ * Mainly for aufs which mmap(2) diffrent file and wants to print different path
+ * in /proc/PID/maps.
+ * Call these functions via macros defined in linux/mm.h.
+ *
+ * See Documentation/filesystems/aufs/design/06mmap.txt
+ *
+ * Copyright (c) 2014 Junjro R. Okajima
+ * Copyright (c) 2014 Ian Campbell
+ */
+
+#include <linux/mm.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+
+/* #define PRFILE_TRACE */
+static inline void prfile_trace(struct file *f, struct file *pr,
+			      const char func[], int line, const char func2[])
+{
+#ifdef PRFILE_TRACE
+	if (pr)
+		pr_info("%s:%d: %s, %p\n", func, line, func2,
+			f ? (char *)f->f_dentry->d_name.name : "(null)");
+#endif
+}
+
+#ifdef CONFIG_MMU
+void vma_do_file_update_time(struct vm_area_struct *vma, const char func[],
+			     int line)
+{
+	struct file *f = vma->vm_file, *pr = vma->vm_prfile;
+
+	prfile_trace(f, pr, func, line, __func__);
+	file_update_time(f);
+	if (f && pr)
+		file_update_time(pr);
+}
+
+struct file *vma_do_pr_or_file(struct vm_area_struct *vma, const char func[],
+			       int line)
+{
+	struct file *f = vma->vm_file, *pr = vma->vm_prfile;
+
+	prfile_trace(f, pr, func, line, __func__);
+	return (f && pr) ? pr : f;
+}
+
+void vma_do_get_file(struct vm_area_struct *vma, const char func[], int line)
+{
+	struct file *f = vma->vm_file, *pr = vma->vm_prfile;
+
+	prfile_trace(f, pr, func, line, __func__);
+	get_file(f);
+	if (f && pr)
+		get_file(pr);
+}
+
+void vma_do_fput(struct vm_area_struct *vma, const char func[], int line)
+{
+	struct file *f = vma->vm_file, *pr = vma->vm_prfile;
+
+	prfile_trace(f, pr, func, line, __func__);
+	fput(f);
+	if (f && pr)
+		fput(pr);
+}
+#else
+struct file *vmr_do_pr_or_file(struct vm_region *region, const char func[],
+			       int line)
+{
+	struct file *f = region->vm_file, *pr = region->vm_prfile;
+
+	prfile_trace(f, pr, func, line, __func__);
+	return (f && pr) ? pr : f;
+}
+
+void vmr_do_fput(struct vm_region *region, const char func[], int line)
+{
+	struct file *f = region->vm_file, *pr = region->vm_prfile;
+
+	prfile_trace(f, pr, func, line, __func__);
+	fput(f);
+	if (f && pr)
+		fput(pr);
+}
+#endif /* CONFIG_MMU */