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-rw-r--r--fs/proc/task_mmu.c125
1 files changed, 71 insertions, 54 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 93fb2c61b154..507b7dc7c4c8 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -239,6 +239,67 @@ static int do_maps_open(struct inode *inode, struct file *file,
sizeof(struct proc_maps_private));
}
+static void get_vma_name(struct vm_area_struct *vma,
+ const struct path **path,
+ const char **name,
+ const char **name_fmt)
+{
+ struct anon_vma_name *anon_name = vma->vm_mm ? anon_vma_name(vma) : NULL;
+
+ *name = NULL;
+ *path = NULL;
+ *name_fmt = NULL;
+
+ /*
+ * Print the dentry name for named mappings, and a
+ * special [heap] marker for the heap:
+ */
+ if (vma->vm_file) {
+ /*
+ * If user named this anon shared memory via
+ * prctl(PR_SET_VMA ..., use the provided name.
+ */
+ if (anon_name) {
+ *name_fmt = "[anon_shmem:%s]";
+ *name = anon_name->name;
+ } else {
+ *path = file_user_path(vma->vm_file);
+ }
+ return;
+ }
+
+ if (vma->vm_ops && vma->vm_ops->name) {
+ *name = vma->vm_ops->name(vma);
+ if (*name)
+ return;
+ }
+
+ *name = arch_vma_name(vma);
+ if (*name)
+ return;
+
+ if (!vma->vm_mm) {
+ *name = "[vdso]";
+ return;
+ }
+
+ if (vma_is_initial_heap(vma)) {
+ *name = "[heap]";
+ return;
+ }
+
+ if (vma_is_initial_stack(vma)) {
+ *name = "[stack]";
+ return;
+ }
+
+ if (anon_name) {
+ *name_fmt = "[anon:%s]";
+ *name = anon_name->name;
+ return;
+ }
+}
+
static void show_vma_header_prefix(struct seq_file *m,
unsigned long start, unsigned long end,
vm_flags_t flags, unsigned long long pgoff,
@@ -262,17 +323,15 @@ static void show_vma_header_prefix(struct seq_file *m,
static void
show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
{
- struct anon_vma_name *anon_name = NULL;
- struct mm_struct *mm = vma->vm_mm;
- struct file *file = vma->vm_file;
+ const struct path *path;
+ const char *name_fmt, *name;
vm_flags_t flags = vma->vm_flags;
unsigned long ino = 0;
unsigned long long pgoff = 0;
unsigned long start, end;
dev_t dev = 0;
- const char *name = NULL;
- if (file) {
+ if (vma->vm_file) {
const struct inode *inode = file_user_inode(vma->vm_file);
dev = inode->i_sb->s_dev;
@@ -283,57 +342,15 @@ show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
start = vma->vm_start;
end = vma->vm_end;
show_vma_header_prefix(m, start, end, flags, pgoff, dev, ino);
- if (mm)
- anon_name = anon_vma_name(vma);
- /*
- * Print the dentry name for named mappings, and a
- * special [heap] marker for the heap:
- */
- if (file) {
+ get_vma_name(vma, &path, &name, &name_fmt);
+ if (path) {
seq_pad(m, ' ');
- /*
- * If user named this anon shared memory via
- * prctl(PR_SET_VMA ..., use the provided name.
- */
- if (anon_name)
- seq_printf(m, "[anon_shmem:%s]", anon_name->name);
- else
- seq_path(m, file_user_path(file), "\n");
- goto done;
- }
-
- if (vma->vm_ops && vma->vm_ops->name) {
- name = vma->vm_ops->name(vma);
- if (name)
- goto done;
- }
-
- name = arch_vma_name(vma);
- if (!name) {
- if (!mm) {
- name = "[vdso]";
- goto done;
- }
-
- if (vma_is_initial_heap(vma)) {
- name = "[heap]";
- goto done;
- }
-
- if (vma_is_initial_stack(vma)) {
- name = "[stack]";
- goto done;
- }
-
- if (anon_name) {
- seq_pad(m, ' ');
- seq_printf(m, "[anon:%s]", anon_name->name);
- }
- }
-
-done:
- if (name) {
+ seq_path(m, path, "\n");
+ } else if (name_fmt) {
+ seq_pad(m, ' ');
+ seq_printf(m, name_fmt, name);
+ } else if (name) {
seq_pad(m, ' ');
seq_puts(m, name);
}