mm: extract exe_file handling from procfs

Setup and cleanup of mm_struct->exe_file is currently done in fs/proc/.
This was because exe_file was needed only for /proc/<pid>/exe.  Since we
will need the exe_file functionality also for core dumps (so core name can
contain full binary path), built this functionality always into the
kernel.

To achieve that move that out of proc FS to the kernel/ where in fact it
should belong.  By doing that we can make dup_mm_exe_file static.  Also we
can drop linux/proc_fs.h inclusion in fs/exec.c and kernel/fork.c.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 2 insertions, 29 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index fb8e814f78dc..9670f71d7be9 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1408,17 +1408,11 @@ extern void exit_mmap(struct mm_struct *);
 extern int mm_take_all_locks(struct mm_struct *mm);
 extern void mm_drop_all_locks(struct mm_struct *mm);
 
-#ifdef CONFIG_PROC_FS
 /* From fs/proc/base.c. callers must _not_ hold the mm's exe_file_lock */
 extern void added_exe_file_vma(struct mm_struct *mm);
 extern void removed_exe_file_vma(struct mm_struct *mm);
-#else
-static inline void added_exe_file_vma(struct mm_struct *mm)
-{}
-
-static inline void removed_exe_file_vma(struct mm_struct *mm)
-{}
-#endif /* CONFIG_PROC_FS */
+extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
+extern struct file *get_mm_exe_file(struct mm_struct *mm);
 
 extern int may_expand_vm(struct mm_struct *mm, unsigned long npages);
 extern int install_special_mapping(struct mm_struct *mm,
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 6fe96c19f85e..2a78aae78c69 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -302,11 +302,9 @@ struct mm_struct {
         struct task_struct __rcu *owner;
 #endif
 
-#ifdef CONFIG_PROC_FS
         /* store ref to file /proc/<pid>/exe symlink points to */
         struct file *exe_file;
         unsigned long num_exe_file_vmas;
-#endif
 #ifdef CONFIG_MMU_NOTIFIER
         struct mmu_notifier_mm *mmu_notifier_mm;
 #endif
diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h
index 648c9c58add7..e7576cf9e32d 100644
--- a/include/linux/proc_fs.h
+++ b/include/linux/proc_fs.h
@@ -173,12 +173,6 @@ extern void proc_net_remove(struct net *net, const char *name);
 extern struct proc_dir_entry *proc_net_mkdir(struct net *net, const char *name,
         struct proc_dir_entry *parent);
 
-/* While the {get|set|dup}_mm_exe_file functions are for mm_structs, they are
- * only needed to implement /proc/<pid>|self/exe so we define them here. */
-extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file);
-extern struct file *get_mm_exe_file(struct mm_struct *mm);
-extern void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm);
-
 extern struct file *proc_ns_fget(int fd);
 
 #else
@@ -230,19 +224,6 @@ static inline void pid_ns_release_proc(struct pid_namespace *ns)
 {
 }
 
-static inline void set_mm_exe_file(struct mm_struct *mm,
-                                   struct file *new_exe_file)
-{}
-
-static inline struct file *get_mm_exe_file(struct mm_struct *mm)
-{
-        return NULL;
-}
-
-static inline void dup_mm_exe_file(struct mm_struct *oldmm,
-                                   struct mm_struct *newmm)
-{}
-
 static inline struct file *proc_ns_fget(int fd)
 {
         return ERR_PTR(-EINVAL);