2015-06-16 22:42:42 +00:00
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From: J. R. Okajima <hooanon05@yahoo.co.jp>
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2016-02-15 16:36:21 +00:00
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Date: Wed Feb 10 03:44:15 2016 +0900
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2015-12-10 18:25:40 +00:00
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Subject: aufs4.x-rcN mmap patch
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2016-02-15 16:36:21 +00:00
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Origin: https://github.com/sfjro/aufs4-standalone/tree/5fecf5788b797f74b83e36ca921dc1c4bfdcbad9
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2015-06-16 22:42:42 +00:00
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Bug-Debian: https://bugs.debian.org/541828
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Patch headers added by debian/patches/features/all/aufs4/gen-patch
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2015-12-10 18:25:40 +00:00
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aufs4.x-rcN mmap patch
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2015-12-10 18:13:16 +00:00
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2015-06-16 22:42:42 +00:00
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--- a/fs/proc/base.c
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+++ b/fs/proc/base.c
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2016-02-21 04:12:42 +00:00
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@@ -1933,7 +1933,7 @@ static int map_files_get_link(struct den
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2015-06-16 22:42:42 +00:00
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down_read(&mm->mmap_sem);
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vma = find_exact_vma(mm, vm_start, vm_end);
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if (vma && vma->vm_file) {
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- *path = vma->vm_file->f_path;
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+ *path = vma_pr_or_file(vma)->f_path;
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path_get(path);
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rc = 0;
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}
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--- a/fs/proc/nommu.c
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+++ b/fs/proc/nommu.c
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2016-02-21 04:12:42 +00:00
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@@ -45,7 +45,10 @@ static int nommu_region_show(struct seq_
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2015-06-16 22:42:42 +00:00
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file = region->vm_file;
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if (file) {
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- struct inode *inode = file_inode(region->vm_file);
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+ struct inode *inode;
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+
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+ file = vmr_pr_or_file(region);
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+ inode = file_inode(file);
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dev = inode->i_sb->s_dev;
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ino = inode->i_ino;
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}
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--- a/fs/proc/task_mmu.c
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+++ b/fs/proc/task_mmu.c
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2016-02-21 04:12:42 +00:00
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@@ -298,7 +298,10 @@ show_map_vma(struct seq_file *m, struct
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2015-06-16 22:42:42 +00:00
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const char *name = NULL;
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if (file) {
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- struct inode *inode = file_inode(vma->vm_file);
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+ struct inode *inode;
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+
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+ file = vma_pr_or_file(vma);
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+ inode = file_inode(file);
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dev = inode->i_sb->s_dev;
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ino = inode->i_ino;
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pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
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2016-02-21 04:12:42 +00:00
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@@ -1576,7 +1579,7 @@ static int show_numa_map(struct seq_file
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2015-06-16 22:42:42 +00:00
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struct proc_maps_private *proc_priv = &numa_priv->proc_maps;
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struct vm_area_struct *vma = v;
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struct numa_maps *md = &numa_priv->md;
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- struct file *file = vma->vm_file;
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+ struct file *file = vma_pr_or_file(vma);
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struct mm_struct *mm = vma->vm_mm;
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struct mm_walk walk = {
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.hugetlb_entry = gather_hugetlb_stats,
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--- a/fs/proc/task_nommu.c
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+++ b/fs/proc/task_nommu.c
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2016-02-21 04:12:42 +00:00
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@@ -163,7 +163,10 @@ static int nommu_vma_show(struct seq_fil
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2015-06-16 22:42:42 +00:00
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file = vma->vm_file;
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if (file) {
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- struct inode *inode = file_inode(vma->vm_file);
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+ struct inode *inode;
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+
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2015-09-19 01:20:55 +00:00
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+ file = vma_pr_or_file(vma);
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2015-06-16 22:42:42 +00:00
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+ inode = file_inode(file);
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dev = inode->i_sb->s_dev;
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ino = inode->i_ino;
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pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT;
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--- a/include/linux/mm.h
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+++ b/include/linux/mm.h
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2016-02-21 04:12:42 +00:00
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@@ -1217,6 +1217,28 @@ static inline int fixup_user_fault(struc
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2015-06-16 22:42:42 +00:00
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}
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#endif
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+extern void vma_do_file_update_time(struct vm_area_struct *, const char[], int);
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+extern struct file *vma_do_pr_or_file(struct vm_area_struct *, const char[],
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+ int);
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+extern void vma_do_get_file(struct vm_area_struct *, const char[], int);
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+extern void vma_do_fput(struct vm_area_struct *, const char[], int);
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+
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+#define vma_file_update_time(vma) vma_do_file_update_time(vma, __func__, \
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+ __LINE__)
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+#define vma_pr_or_file(vma) vma_do_pr_or_file(vma, __func__, \
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+ __LINE__)
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+#define vma_get_file(vma) vma_do_get_file(vma, __func__, __LINE__)
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+#define vma_fput(vma) vma_do_fput(vma, __func__, __LINE__)
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2015-09-19 01:20:55 +00:00
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+
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+#ifndef CONFIG_MMU
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2015-06-16 22:42:42 +00:00
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+extern struct file *vmr_do_pr_or_file(struct vm_region *, const char[], int);
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+extern void vmr_do_fput(struct vm_region *, const char[], int);
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+
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+#define vmr_pr_or_file(region) vmr_do_pr_or_file(region, __func__, \
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+ __LINE__)
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+#define vmr_fput(region) vmr_do_fput(region, __func__, __LINE__)
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2015-09-19 01:20:55 +00:00
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+#endif /* !CONFIG_MMU */
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2015-06-16 22:42:42 +00:00
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+
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extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write);
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extern int access_remote_vm(struct mm_struct *mm, unsigned long addr,
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void *buf, int len, int write);
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--- a/include/linux/mm_types.h
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+++ b/include/linux/mm_types.h
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2016-02-15 16:36:21 +00:00
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@@ -269,6 +269,7 @@ struct vm_region {
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2015-06-16 22:42:42 +00:00
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unsigned long vm_top; /* region allocated to here */
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unsigned long vm_pgoff; /* the offset in vm_file corresponding to vm_start */
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struct file *vm_file; /* the backing file or NULL */
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+ struct file *vm_prfile; /* the virtual backing file or NULL */
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int vm_usage; /* region usage count (access under nommu_region_sem) */
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bool vm_icache_flushed : 1; /* true if the icache has been flushed for
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2016-02-15 16:36:21 +00:00
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@@ -343,6 +344,7 @@ struct vm_area_struct {
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2015-06-16 22:42:42 +00:00
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unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE
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units, *not* PAGE_CACHE_SIZE */
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struct file * vm_file; /* File we map to (can be NULL). */
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+ struct file *vm_prfile; /* shadow of vm_file */
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void * vm_private_data; /* was vm_pte (shared mem) */
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#ifndef CONFIG_MMU
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--- a/kernel/fork.c
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+++ b/kernel/fork.c
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2016-02-21 04:12:42 +00:00
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@@ -464,7 +464,7 @@ static int dup_mmap(struct mm_struct *mm
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2015-06-16 22:42:42 +00:00
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struct inode *inode = file_inode(file);
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struct address_space *mapping = file->f_mapping;
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- get_file(file);
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+ vma_get_file(tmp);
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if (tmp->vm_flags & VM_DENYWRITE)
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atomic_dec(&inode->i_writecount);
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i_mmap_lock_write(mapping);
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--- a/mm/Makefile
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+++ b/mm/Makefile
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2016-02-21 04:12:42 +00:00
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@@ -21,7 +21,7 @@ obj-y := filemap.o mempool.o oom_kill.
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2015-06-16 22:42:42 +00:00
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mm_init.o mmu_context.o percpu.o slab_common.o \
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compaction.o vmacache.o \
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interval_tree.o list_lru.o workingset.o \
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- debug.o $(mmu-y)
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+ prfile.o debug.o $(mmu-y)
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obj-y += init-mm.o
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--- a/mm/filemap.c
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+++ b/mm/filemap.c
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2016-02-21 04:12:42 +00:00
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@@ -2210,7 +2210,7 @@ int filemap_page_mkwrite(struct vm_area_
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2015-06-16 22:42:42 +00:00
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int ret = VM_FAULT_LOCKED;
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sb_start_pagefault(inode->i_sb);
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- file_update_time(vma->vm_file);
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+ vma_file_update_time(vma);
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lock_page(page);
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if (page->mapping != inode->i_mapping) {
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unlock_page(page);
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--- a/mm/memory.c
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+++ b/mm/memory.c
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2016-02-21 04:12:42 +00:00
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@@ -2042,7 +2042,7 @@ static inline int wp_page_reuse(struct m
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2015-06-16 22:42:42 +00:00
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}
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if (!page_mkwrite)
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- file_update_time(vma->vm_file);
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+ vma_file_update_time(vma);
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}
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return VM_FAULT_WRITE;
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--- a/mm/mmap.c
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+++ b/mm/mmap.c
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2016-02-21 04:12:42 +00:00
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@@ -290,7 +290,7 @@ static struct vm_area_struct *remove_vma
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2015-06-16 22:42:42 +00:00
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if (vma->vm_ops && vma->vm_ops->close)
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vma->vm_ops->close(vma);
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if (vma->vm_file)
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- fput(vma->vm_file);
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+ vma_fput(vma);
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mpol_put(vma_policy(vma));
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kmem_cache_free(vm_area_cachep, vma);
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return next;
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2016-02-21 04:12:42 +00:00
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@@ -909,7 +909,7 @@ again: remove_next = 1 + (end > next->
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2015-06-16 22:42:42 +00:00
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if (remove_next) {
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if (file) {
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uprobe_munmap(next, next->vm_start, next->vm_end);
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- fput(file);
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+ vma_fput(vma);
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}
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if (next->anon_vma)
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anon_vma_merge(vma, next);
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2016-02-15 16:36:21 +00:00
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@@ -1683,8 +1683,8 @@ out:
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2015-06-16 22:42:42 +00:00
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return addr;
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unmap_and_free_vma:
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+ vma_fput(vma);
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vma->vm_file = NULL;
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- fput(file);
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/* Undo any partial mapping done by a device driver. */
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unmap_region(mm, vma, prev, vma->vm_start, vma->vm_end);
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2016-02-21 04:12:42 +00:00
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@@ -2479,7 +2479,7 @@ static int __split_vma(struct mm_struct
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2015-06-16 22:42:42 +00:00
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goto out_free_mpol;
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if (new->vm_file)
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- get_file(new->vm_file);
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+ vma_get_file(new);
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if (new->vm_ops && new->vm_ops->open)
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new->vm_ops->open(new);
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2016-02-21 04:12:42 +00:00
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@@ -2498,7 +2498,7 @@ static int __split_vma(struct mm_struct
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2015-06-16 22:42:42 +00:00
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if (new->vm_ops && new->vm_ops->close)
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new->vm_ops->close(new);
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if (new->vm_file)
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- fput(new->vm_file);
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+ vma_fput(new);
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unlink_anon_vmas(new);
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out_free_mpol:
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mpol_put(vma_policy(new));
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2016-02-21 04:12:42 +00:00
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@@ -2640,7 +2640,6 @@ SYSCALL_DEFINE5(remap_file_pages, unsign
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2015-06-16 22:42:42 +00:00
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struct vm_area_struct *vma;
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unsigned long populate = 0;
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unsigned long ret = -EINVAL;
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- struct file *file;
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pr_warn_once("%s (%d) uses deprecated remap_file_pages() syscall. "
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"See Documentation/vm/remap_file_pages.txt.\n",
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2016-02-21 04:12:42 +00:00
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@@ -2708,10 +2707,10 @@ SYSCALL_DEFINE5(remap_file_pages, unsign
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}
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2015-06-16 22:42:42 +00:00
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}
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- file = get_file(vma->vm_file);
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+ vma_get_file(vma);
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ret = do_mmap_pgoff(vma->vm_file, start, size,
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prot, flags, pgoff, &populate);
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- fput(file);
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+ vma_fput(vma);
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out:
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up_write(&mm->mmap_sem);
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if (populate)
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2016-02-21 04:12:42 +00:00
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@@ -2982,7 +2981,7 @@ struct vm_area_struct *copy_vma(struct v
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2015-09-26 16:23:14 +00:00
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if (anon_vma_clone(new_vma, vma))
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goto out_free_mempol;
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if (new_vma->vm_file)
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- get_file(new_vma->vm_file);
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+ vma_get_file(new_vma);
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if (new_vma->vm_ops && new_vma->vm_ops->open)
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new_vma->vm_ops->open(new_vma);
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vma_link(mm, new_vma, prev, rb_link, rb_parent);
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2015-06-16 22:42:42 +00:00
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--- a/mm/nommu.c
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+++ b/mm/nommu.c
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2016-02-21 04:12:42 +00:00
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@@ -671,7 +671,7 @@ static void __put_nommu_region(struct vm
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2015-06-16 22:42:42 +00:00
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up_write(&nommu_region_sem);
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if (region->vm_file)
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- fput(region->vm_file);
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+ vmr_fput(region);
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/* IO memory and memory shared directly out of the pagecache
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* from ramfs/tmpfs mustn't be released here */
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2016-02-21 04:12:42 +00:00
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@@ -829,7 +829,7 @@ static void delete_vma(struct mm_struct
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2015-06-16 22:42:42 +00:00
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if (vma->vm_ops && vma->vm_ops->close)
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vma->vm_ops->close(vma);
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if (vma->vm_file)
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- fput(vma->vm_file);
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+ vma_fput(vma);
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put_nommu_region(vma->vm_region);
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kmem_cache_free(vm_area_cachep, vma);
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}
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2015-09-26 16:23:14 +00:00
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@@ -1355,7 +1355,7 @@ unsigned long do_mmap(struct file *file,
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2015-06-16 22:42:42 +00:00
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goto error_just_free;
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}
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}
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- fput(region->vm_file);
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+ vmr_fput(region);
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kmem_cache_free(vm_region_jar, region);
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region = pregion;
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result = start;
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2015-09-26 16:23:14 +00:00
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@@ -1430,10 +1430,10 @@ error_just_free:
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2015-06-16 22:42:42 +00:00
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up_write(&nommu_region_sem);
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error:
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if (region->vm_file)
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- fput(region->vm_file);
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+ vmr_fput(region);
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kmem_cache_free(vm_region_jar, region);
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if (vma->vm_file)
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- fput(vma->vm_file);
|
|
|
|
+ vma_fput(vma);
|
|
|
|
kmem_cache_free(vm_area_cachep, vma);
|
|
|
|
return ret;
|
2015-08-04 01:30:23 +00:00
|
|
|
|
2015-06-16 22:42:42 +00:00
|
|
|
--- /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)
|
2015-09-19 01:20:55 +00:00
|
|
|
+ pr_info("%s:%d: %s, %s\n", func, line, func2,
|
2015-06-16 22:42:42 +00:00
|
|
|
+ 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);
|
|
|
|
+}
|
2015-09-19 01:20:55 +00:00
|
|
|
+
|
|
|
|
+#ifndef CONFIG_MMU
|
2015-06-16 22:42:42 +00:00
|
|
|
+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);
|
|
|
|
+}
|
2015-09-19 01:20:55 +00:00
|
|
|
+#endif /* !CONFIG_MMU */
|