fuse: invalidate target of rename

[safe/jmp/linux-2.6] / fs / proc / task_mmu.c

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 41ef5f2..2a1bef9 100644 (file)
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -119,6 +119,7 @@ static void *m_start(struct seq_file *m, loff_t *pos)
        mm = mm_for_maps(priv->task);
        if (!mm)
                return NULL;
+       down_read(&mm->mmap_sem);
 
        tail_vma = get_gate_vma(priv->task);
        priv->tail_vma = tail_vma;
@@ -204,6 +205,7 @@ static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
        struct file *file = vma->vm_file;
        int flags = vma->vm_flags;
        unsigned long ino = 0;
+       unsigned long long pgoff = 0;
        dev_t dev = 0;
        int len;
 
@@ -211,6 +213,7 @@ static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
                struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
                dev = inode->i_sb->s_dev;
                ino = inode->i_ino;
+               pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
        }
 
        seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n",
@@ -220,7 +223,7 @@ static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
                        flags & VM_WRITE ? 'w' : '-',
                        flags & VM_EXEC ? 'x' : '-',
                        flags & VM_MAYSHARE ? 's' : 'p',
-                       ((loff_t)vma->vm_pgoff) << PAGE_SHIFT,
+                       pgoff,
                        MAJOR(dev), MINOR(dev), ino, &len);
 
        /*
@@ -240,6 +243,25 @@ static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
                                } else if (vma->vm_start <= mm->start_stack &&
                                           vma->vm_end >= mm->start_stack) {
                                        name = "[stack]";
+                               } else {
+                                       unsigned long stack_start;
+                                       struct proc_maps_private *pmp;
+
+                                       pmp = m->private;
+                                       stack_start = pmp->task->stack_start;
+
+                                       if (vma->vm_start <= stack_start &&
+                                           vma->vm_end >= stack_start) {
+                                               pad_len_spaces(m, len);
+                                               seq_printf(m,
+                                                "[threadstack:%08lx]",
+#ifdef CONFIG_STACK_GROWSUP
+                                                vma->vm_end - stack_start
+#else
+                                                stack_start - vma->vm_start
+#endif
+                                               );
+                                       }
                                }
                        } else {
                                name = "[vdso]";
@@ -397,7 +419,8 @@ static int show_smap(struct seq_file *m, void *v)
                   "Private_Dirty:  %8lu kB\n"
                   "Referenced:     %8lu kB\n"
                   "Swap:           %8lu kB\n"
-                  "KernelPageSize: %8lu kB\n",
+                  "KernelPageSize: %8lu kB\n"
+                  "MMUPageSize:    %8lu kB\n",
                   (vma->vm_end - vma->vm_start) >> 10,
                   mss.resident >> 10,
                   (unsigned long)(mss.pss >> (10 + PSS_SHIFT)),
@@ -407,7 +430,8 @@ static int show_smap(struct seq_file *m, void *v)
                   mss.private_dirty >> 10,
                   mss.referenced >> 10,
                   mss.swap >> 10,
-                  vma_kernel_pagesize(vma) >> 10);
+                  vma_kernel_pagesize(vma) >> 10,
+                  vma_mmu_pagesize(vma) >> 10);
 
        if (m->count < m->size)  /* vma is copied successfully */
                m->version = (vma != get_gate_vma(task)) ? vma->vm_start : 0;
@@ -460,23 +484,28 @@ static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
        return 0;
 }
 
+#define CLEAR_REFS_ALL 1
+#define CLEAR_REFS_ANON 2
+#define CLEAR_REFS_MAPPED 3
+
 static ssize_t clear_refs_write(struct file *file, const char __user *buf,
                                size_t count, loff_t *ppos)
 {
        struct task_struct *task;
-       char buffer[PROC_NUMBUF], *end;
+       char buffer[PROC_NUMBUF];
        struct mm_struct *mm;
        struct vm_area_struct *vma;
+       long type;
 
        memset(buffer, 0, sizeof(buffer));
        if (count > sizeof(buffer) - 1)
                count = sizeof(buffer) - 1;
        if (copy_from_user(buffer, buf, count))
                return -EFAULT;
-       if (!simple_strtol(buffer, &end, 0))
+       if (strict_strtol(strstrip(buffer), 10, &type))
+               return -EINVAL;
+       if (type < CLEAR_REFS_ALL || type > CLEAR_REFS_MAPPED)
                return -EINVAL;
-       if (*end == '\n')
-               end++;
        task = get_proc_task(file->f_path.dentry->d_inode);
        if (!task)
                return -ESRCH;
@@ -489,18 +518,31 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
                down_read(&mm->mmap_sem);
                for (vma = mm->mmap; vma; vma = vma->vm_next) {
                        clear_refs_walk.private = vma;
-                       if (!is_vm_hugetlb_page(vma))
-                               walk_page_range(vma->vm_start, vma->vm_end,
-                                               &clear_refs_walk);
+                       if (is_vm_hugetlb_page(vma))
+                               continue;
+                       /*
+                        * Writing 1 to /proc/pid/clear_refs affects all pages.
+                        *
+                        * Writing 2 to /proc/pid/clear_refs only affects
+                        * Anonymous pages.
+                        *
+                        * Writing 3 to /proc/pid/clear_refs only affects file
+                        * mapped pages.
+                        */
+                       if (type == CLEAR_REFS_ANON && vma->vm_file)
+                               continue;
+                       if (type == CLEAR_REFS_MAPPED && !vma->vm_file)
+                               continue;
+                       walk_page_range(vma->vm_start, vma->vm_end,
+                                       &clear_refs_walk);
                }
                flush_tlb_mm(mm);
                up_read(&mm->mmap_sem);
                mmput(mm);
        }
        put_task_struct(task);
-       if (end - buffer == 0)
-               return -EIO;
-       return end - buffer;
+
+       return count;
 }
 
 const struct file_operations proc_clear_refs_operations = {
@@ -661,6 +703,10 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
                goto out_task;
 
        ret = 0;
+
+       if (!count)
+               goto out_task;
+
        mm = get_task_mm(task);
        if (!mm)
                goto out_task;
@@ -691,8 +737,8 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
                goto out_pages;
        }
 
-       pm.out = (u64 *)buf;
-       pm.end = (u64 *)(buf + count);
+       pm.out = (u64 __user *)buf;
+       pm.end = (u64 __user *)(buf + count);
 
        pagemap_walk.pmd_entry = pagemap_pte_range;
        pagemap_walk.pte_hole = pagemap_pte_hole;
@@ -718,9 +764,9 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
        if (ret == PM_END_OF_BUFFER)
                ret = 0;
        /* don't need mmap_sem for these, but this looks cleaner */
-       *ppos += (char *)pm.out - buf;
+       *ppos += (char __user *)pm.out - buf;
        if (!ret)
-               ret = (char *)pm.out - buf;
+               ret = (char __user *)pm.out - buf;
 
 out_pages:
        for (; pagecount; pagecount--) {