Linux-libre 4.2.1-gnupck-4.2.1-gnu

8 files changed, 167 insertions, 50 deletions

diff --git a/mm/Makefile b/mm/Makefile
index b4773abcb..6218349e5 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -21,7 +21,7 @@ obj-y			:= filemap.o mempool.o oom_kill.o \
 			   mm_init.o mmu_context.o percpu.o slab_common.o \
 			   compaction.o vmacache.o \
 			   interval_tree.o list_lru.o workingset.o \
-			   debug.o $(mmu-y)
+			   prfile.o debug.o $(mmu-y)
 
 obj-y += init-mm.o
 
diff --git a/mm/filemap.c b/mm/filemap.c
index 1283fc825..128f18fc4 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2089,7 +2089,7 @@ int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 	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);
diff --git a/mm/memory.c b/mm/memory.c
index bf1f96a11..106ae6439 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2066,7 +2066,7 @@ static inline int wp_page_reuse(struct mm_struct *mm,
 		}
 
 		if (!page_mkwrite)
-			file_update_time(vma->vm_file);
+			vma_file_update_time(vma);
 	}
 
 	return VM_FAULT_WRITE;
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 6da82bcb0..8fd97dac5 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1248,6 +1248,14 @@ int __ref add_memory(int nid, u64 start, u64 size)
 
 	mem_hotplug_begin();
 
+	/*
+	 * Add new range to memblock so that when hotadd_new_pgdat() is called
+	 * to allocate new pgdat, get_pfn_range_for_nid() will be able to find
+	 * this new range and calculate total pages correctly.  The range will
+	 * be removed at hot-remove time.
+	 */
+	memblock_add_node(start, size, nid);
+
 	new_node = !node_online(nid);
 	if (new_node) {
 		pgdat = hotadd_new_pgdat(nid, start);
@@ -1277,7 +1285,6 @@ int __ref add_memory(int nid, u64 start, u64 size)
 
 	/* create new memmap entry */
 	firmware_map_add_hotplug(start, start + size, "System RAM");
-	memblock_add_node(start, size, nid);
 
 	goto out;
 
@@ -1286,6 +1293,7 @@ error:
 	if (new_pgdat)
 		rollback_node_hotadd(nid, pgdat);
 	release_memory_resource(res);
+	memblock_remove(start, size);
 
 out:
 	mem_hotplug_done();
diff --git a/mm/mmap.c b/mm/mmap.c
index b7c720fd8..ee37a9765 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -275,7 +275,7 @@ static struct vm_area_struct *remove_vma(struct vm_area_struct *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));
 	uksm_remove_vma(vma);
 	kmem_cache_free(vm_area_cachep, vma);
@@ -896,7 +896,7 @@ again:			remove_next = 1 + (end > next->vm_end);
 	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);
@@ -1691,8 +1691,8 @@ out:
 	return addr;
 
 unmap_and_free_vma:
+	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);
@@ -2494,7 +2494,7 @@ static int __split_vma(struct mm_struct *mm, struct vm_area_struct *vma,
 		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);
@@ -2515,7 +2515,7 @@ static int __split_vma(struct mm_struct *mm, struct vm_area_struct *vma,
 	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));
@@ -2658,7 +2658,6 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
 	struct vm_area_struct *vma;
 	unsigned long populate = 0;
 	unsigned long ret = -EINVAL;
-	struct file *file;
 
 	pr_warn_once("%s (%d) uses deprecated remap_file_pages() syscall. "
 			"See Documentation/vm/remap_file_pages.txt.\n",
@@ -2702,10 +2701,10 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
 		munlock_vma_pages_range(vma, start, start + size);
 	}
 
-	file = get_file(vma->vm_file);
+	vma_get_file(vma);
 	ret = do_mmap_pgoff(vma->vm_file, start, size,
 			prot, flags, pgoff, &populate);
-	fput(file);
+	vma_fput(vma);
 out:
 	up_write(&mm->mmap_sem);
 	if (populate)
@@ -2985,7 +2984,7 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap,
 			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);
diff --git a/mm/nommu.c b/mm/nommu.c
index 58ea3643b..f937b7e52 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -671,7 +671,7 @@ static void __put_nommu_region(struct vm_region *region)
 		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 */
@@ -829,7 +829,7 @@ static void delete_vma(struct mm_struct *mm, struct vm_area_struct *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);
 	put_nommu_region(vma->vm_region);
 	kmem_cache_free(vm_area_cachep, vma);
 }
@@ -1354,7 +1354,7 @@ unsigned long do_mmap_pgoff(struct file *file,
 					goto error_just_free;
 				}
 			}
-			fput(region->vm_file);
+			vmr_fput(region);
 			kmem_cache_free(vm_region_jar, region);
 			region = pregion;
 			result = start;
@@ -1429,10 +1429,10 @@ 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);
 	return ret;
 
diff --git a/mm/prfile.c b/mm/prfile.c
new file mode 100644
index 000000000..b323b8af9
--- /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, %s\n", func, line, func2,
+			f ? (char *)f->f_path.dentry->d_name.name : "(null)");
+#endif
+}
+
+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);
+}
+
+#ifndef CONFIG_MMU
+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 */
diff --git a/mm/shmem.c b/mm/shmem.c
index d88bf98f0..8c5467e4e 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -110,9 +110,13 @@ static unsigned long shmem_default_max_blocks(void)
 	return totalram_pages / 2;
 }
 
-static unsigned long shmem_default_max_inodes(void)
+static int shmem_default_max_inodes(void)
 {
-	return min(totalram_pages - totalhigh_pages, totalram_pages / 2);
+	unsigned long ul;
+
+	ul = INT_MAX;
+	ul = min3(ul, totalram_pages - totalhigh_pages, totalram_pages / 2);
+	return ul;
 }
 #endif
 
@@ -587,6 +591,7 @@ static int shmem_setattr(struct dentry *dentry, struct iattr *attr)
 static void shmem_evict_inode(struct inode *inode)
 {
 	struct shmem_inode_info *info = SHMEM_I(inode);
+	struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb);
 
 	if (inode->i_mapping->a_ops == &shmem_aops) {
 		shmem_unacct_size(info->flags, inode->i_size);
@@ -602,6 +607,11 @@ static void shmem_evict_inode(struct inode *inode)
 
 	simple_xattrs_free(&info->xattrs);
 	WARN_ON(inode->i_blocks);
+	if (!sbinfo->idr_nouse && inode->i_ino) {
+		mutex_lock(&sbinfo->idr_lock);
+		idr_remove(&sbinfo->idr, inode->i_ino);
+		mutex_unlock(&sbinfo->idr_lock);
+	}
 	shmem_free_inode(inode->i_sb);
 	clear_inode(inode);
 }
@@ -1401,13 +1411,13 @@ static struct inode *shmem_get_inode(struct super_block *sb, const struct inode
 	struct inode *inode;
 	struct shmem_inode_info *info;
 	struct shmem_sb_info *sbinfo = SHMEM_SB(sb);
+	int ino;
 
 	if (shmem_reserve_inode(sb))
 		return NULL;
 
 	inode = new_inode(sb);
 	if (inode) {
-		inode->i_ino = get_next_ino();
 		inode_init_owner(inode, dir, mode);
 		inode->i_blocks = 0;
 		inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
@@ -1450,6 +1460,25 @@ static struct inode *shmem_get_inode(struct super_block *sb, const struct inode
 			mpol_shared_policy_init(&info->policy, NULL);
 			break;
 		}
+
+		if (!sbinfo->idr_nouse) {
+			/* inum 0 and 1 are unused */
+			mutex_lock(&sbinfo->idr_lock);
+			ino = idr_alloc(&sbinfo->idr, inode, 2, INT_MAX,
+					GFP_NOFS);
+			if (ino > 0) {
+				inode->i_ino = ino;
+				mutex_unlock(&sbinfo->idr_lock);
+				__insert_inode_hash(inode, inode->i_ino);
+			} else {
+				inode->i_ino = 0;
+				mutex_unlock(&sbinfo->idr_lock);
+				iput(inode);
+				/* shmem_free_inode() will be called */
+				inode = NULL;
+			}
+		} else
+			inode->i_ino = get_next_ino();
 	} else
 		shmem_free_inode(sb);
 	return inode;
@@ -2667,8 +2696,7 @@ static struct dentry *shmem_get_parent(struct dentry *child)
 static int shmem_match(struct inode *ino, void *vfh)
 {
 	__u32 *fh = vfh;
-	__u64 inum = fh[2];
-	inum = (inum << 32) | fh[1];
+	__u64 inum = fh[1];
 	return ino->i_ino == inum && fh[0] == ino->i_generation;
 }
 
@@ -2679,14 +2707,11 @@ static struct dentry *shmem_fh_to_dentry(struct super_block *sb,
 	struct dentry *dentry = NULL;
 	u64 inum;
 
-	if (fh_len < 3)
+	if (fh_len < 2)
 		return NULL;
 
-	inum = fid->raw[2];
-	inum = (inum << 32) | fid->raw[1];
-
-	inode = ilookup5(sb, (unsigned long)(inum + fid->raw[0]),
-			shmem_match, fid->raw);
+	inum = fid->raw[1];
+	inode = ilookup5(sb, inum, shmem_match, fid->raw);
 	if (inode) {
 		dentry = d_find_alias(inode);
 		iput(inode);
@@ -2698,30 +2723,15 @@ static struct dentry *shmem_fh_to_dentry(struct super_block *sb,
 static int shmem_encode_fh(struct inode *inode, __u32 *fh, int *len,
 				struct inode *parent)
 {
-	if (*len < 3) {
-		*len = 3;
+	if (*len < 2) {
+		*len = 2;
 		return FILEID_INVALID;
 	}
 
-	if (inode_unhashed(inode)) {
-		/* Unfortunately insert_inode_hash is not idempotent,
-		 * so as we hash inodes here rather than at creation
-		 * time, we need a lock to ensure we only try
-		 * to do it once
-		 */
-		static DEFINE_SPINLOCK(lock);
-		spin_lock(&lock);
-		if (inode_unhashed(inode))
-			__insert_inode_hash(inode,
-					    inode->i_ino + inode->i_generation);
-		spin_unlock(&lock);
-	}
-
 	fh[0] = inode->i_generation;
 	fh[1] = inode->i_ino;
-	fh[2] = ((__u64)inode->i_ino) >> 32;
 
-	*len = 3;
+	*len = 2;
 	return 1;
 }
 
@@ -2786,7 +2796,7 @@ static int shmem_parse_options(char *options, struct shmem_sb_info *sbinfo,
 				goto bad_val;
 		} else if (!strcmp(this_char,"nr_inodes")) {
 			sbinfo->max_inodes = memparse(value, &rest);
-			if (*rest)
+			if (*rest || sbinfo->max_inodes < 2)
 				goto bad_val;
 		} else if (!strcmp(this_char,"mode")) {
 			if (remount)
@@ -2839,7 +2849,7 @@ static int shmem_remount_fs(struct super_block *sb, int *flags, char *data)
 {
 	struct shmem_sb_info *sbinfo = SHMEM_SB(sb);
 	struct shmem_sb_info config = *sbinfo;
-	unsigned long inodes;
+	int inodes;
 	int error = -EINVAL;
 
 	config.mpol = NULL;
@@ -2887,7 +2897,7 @@ static int shmem_show_options(struct seq_file *seq, struct dentry *root)
 		seq_printf(seq, ",size=%luk",
 			sbinfo->max_blocks << (PAGE_CACHE_SHIFT - 10));
 	if (sbinfo->max_inodes != shmem_default_max_inodes())
-		seq_printf(seq, ",nr_inodes=%lu", sbinfo->max_inodes);
+		seq_printf(seq, ",nr_inodes=%d", sbinfo->max_inodes);
 	if (sbinfo->mode != (S_IRWXUGO | S_ISVTX))
 		seq_printf(seq, ",mode=%03ho", sbinfo->mode);
 	if (!uid_eq(sbinfo->uid, GLOBAL_ROOT_UID))
@@ -2976,6 +2986,8 @@ static void shmem_put_super(struct super_block *sb)
 {
 	struct shmem_sb_info *sbinfo = SHMEM_SB(sb);
 
+	if (!sbinfo->idr_nouse)
+		idr_destroy(&sbinfo->idr);
 	percpu_counter_destroy(&sbinfo->used_blocks);
 	mpol_put(sbinfo->mpol);
 	kfree(sbinfo);
@@ -2994,6 +3006,8 @@ int shmem_fill_super(struct super_block *sb, void *data, int silent)
 	if (!sbinfo)
 		return -ENOMEM;
 
+	mutex_init(&sbinfo->idr_lock);
+	idr_init(&sbinfo->idr);
 	sbinfo->mode = S_IRWXUGO | S_ISVTX;
 	sbinfo->uid = current_fsuid();
 	sbinfo->gid = current_fsgid();
@@ -3097,6 +3111,15 @@ static void shmem_destroy_inodecache(void)
 	kmem_cache_destroy(shmem_inode_cachep);
 }
 
+static __init void shmem_no_idr(struct super_block *sb)
+{
+	struct shmem_sb_info *sbinfo;
+
+	sbinfo = SHMEM_SB(sb);
+	sbinfo->idr_nouse = true;
+	idr_destroy(&sbinfo->idr);
+}
+
 static const struct address_space_operations shmem_aops = {
 	.writepage	= shmem_writepage,
 	.set_page_dirty	= __set_page_dirty_no_writeback,
@@ -3232,6 +3255,7 @@ int __init shmem_init(void)
 		printk(KERN_ERR "Could not kern_mount tmpfs\n");
 		goto out1;
 	}
+	shmem_no_idr(shm_mnt->mnt_sb);
 	return 0;
 
 out1: