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fanotify: hooks the fanotify_mark syscall to the vfsmount code 

Create a new fanotify_mark flag which indicates we should attach the mark
to the vfsmount holding the object referenced by dfd and pathname rather
than the inode itself.

Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris 2009-12-17 21:24:29 -05:00
parent 90dd201d1a
commit 0ff21db9fc
2 changed files with 14 additions and 5 deletions
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15
fs/notify/fanotify/fanotify_user.c
View File

@ -485,7 +485,8 @@ SYSCALL_DEFINE(fanotify_mark)(int fanotify_fd, unsigned int flags,
__u64 mask, int dfd,
const char __user * pathname)
{
struct inode *inode;
struct inode *inode = NULL;
struct vfsmount *mnt = NULL;
struct fsnotify_group *group;
struct file *filp;
struct path path;
@ -515,16 +516,22 @@ SYSCALL_DEFINE(fanotify_mark)(int fanotify_fd, unsigned int flags,
goto fput_and_out;
/* inode held in place by reference to path; group by fget on fd */
inode = path.dentry->d_inode;
if (!(flags & FAN_MARK_ON_VFSMOUNT))
inode = path.dentry->d_inode;
else
mnt = path.mnt;
group = filp->private_data;
/* create/update an inode mark */
switch (flags & (FAN_MARK_ADD | FAN_MARK_REMOVE)) {
case FAN_MARK_ADD:
ret = fanotify_add_inode_mark(group, inode, mask);
if (flags & FAN_MARK_ON_VFSMOUNT)
ret = fanotify_add_vfsmount_mark(group, mnt, mask);
else
ret = fanotify_add_inode_mark(group, inode, mask);
break;
case FAN_MARK_REMOVE:
ret = fanotify_remove_mark(group, inode, NULL, mask);
ret = fanotify_remove_mark(group, inode, mnt, mask);
break;
default:
ret = -EINVAL;

4
include/linux/fanotify.h
View File

@ -29,11 +29,13 @@
#define FAN_MARK_REMOVE 0x00000002
#define FAN_MARK_DONT_FOLLOW 0x00000004
#define FAN_MARK_ONLYDIR 0x00000008
#define FAN_MARK_ON_VFSMOUNT 0x00000010
#define FAN_ALL_MARK_FLAGS (FAN_MARK_ADD |\
FAN_MARK_REMOVE |\
FAN_MARK_DONT_FOLLOW |\
FAN_MARK_ONLYDIR)
FAN_MARK_ONLYDIR |\
FAN_MARK_ON_VFSMOUNT)
/*
* All of the events - we build the list by hand so that we can add flags in