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fsnotify/vfsmount: add fsnotify fields to struct vfsmount 

This patch adds the list and mask fields needed to support vfsmount marks.
These are the same fields fsnotify needs on an inode.  They are not used,
just declared and we note where the cleanup hook should be (the function is
not yet defined)

Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Andreas Gruenbacher 2009-12-17 21:24:27 -05:00 committed by Eric Paris
parent ba643f04cd
commit 2504c5d63b
3 changed files with 10 additions and 4 deletions
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4
fs/namespace.c
View File

@ -29,6 +29,7 @@
#include <linux/log2.h>
#include <linux/idr.h>
#include <linux/fs_struct.h>
#include <linux/fsnotify.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
#include "pnode.h"
@ -150,6 +151,9 @@ struct vfsmount *alloc_vfsmnt(const char *name)
INIT_LIST_HEAD(&mnt->mnt_share);
INIT_LIST_HEAD(&mnt->mnt_slave_list);
INIT_LIST_HEAD(&mnt->mnt_slave);
#ifdef CONFIG_FSNOTIFY
INIT_HLIST_HEAD(&mnt->mnt_fsnotify_marks);
#endif
#ifdef CONFIG_SMP
mnt->mnt_writers = alloc_percpu(int);
if (!mnt->mnt_writers)

4
fs/notify/fsnotify.c
View File

@ -163,9 +163,7 @@ static bool needed_by_vfsmount(__u32 test_mask, struct vfsmount *mnt)
if (!mnt)
return false;
/* hook in this when mnt->mnt_fsnotify_mask is defined */
/* return (test_mask & path->mnt->mnt_fsnotify_mask); */
return false;
return (test_mask & mnt->mnt_fsnotify_mask);
}
/*
* This is the main call to fsnotify. The VFS calls into hook specific functions

6
include/linux/mount.h
View File

@ -56,7 +56,11 @@ struct vfsmount {
struct list_head mnt_mounts; /* list of children, anchored here */
struct list_head mnt_child; /* and going through their mnt_child */
int mnt_flags;
/* 4 bytes hole on 64bits arches */
/* 4 bytes hole on 64bits arches without fsnotify */
#ifdef CONFIG_FSNOTIFY
__u32 mnt_fsnotify_mask;
struct hlist_head mnt_fsnotify_marks;
#endif
const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */
struct list_head mnt_list;
struct list_head mnt_expire; /* link in fs-specific expiry list */