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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>
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@ -485,7 +485,8 @@ SYSCALL_DEFINE(fanotify_mark)(int fanotify_fd, unsigned int flags,
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__u64 mask, int dfd,
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const char __user * pathname)
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{
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struct inode *inode;
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struct inode *inode = NULL;
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struct vfsmount *mnt = NULL;
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struct fsnotify_group *group;
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struct file *filp;
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struct path path;
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@ -515,16 +516,22 @@ SYSCALL_DEFINE(fanotify_mark)(int fanotify_fd, unsigned int flags,
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goto fput_and_out;
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/* inode held in place by reference to path; group by fget on fd */
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inode = path.dentry->d_inode;
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if (!(flags & FAN_MARK_ON_VFSMOUNT))
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inode = path.dentry->d_inode;
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else
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mnt = path.mnt;
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group = filp->private_data;
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/* create/update an inode mark */
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switch (flags & (FAN_MARK_ADD | FAN_MARK_REMOVE)) {
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case FAN_MARK_ADD:
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ret = fanotify_add_inode_mark(group, inode, mask);
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if (flags & FAN_MARK_ON_VFSMOUNT)
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ret = fanotify_add_vfsmount_mark(group, mnt, mask);
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else
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ret = fanotify_add_inode_mark(group, inode, mask);
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break;
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case FAN_MARK_REMOVE:
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ret = fanotify_remove_mark(group, inode, NULL, mask);
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ret = fanotify_remove_mark(group, inode, mnt, mask);
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break;
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default:
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ret = -EINVAL;
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@ -29,11 +29,13 @@
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#define FAN_MARK_REMOVE 0x00000002
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#define FAN_MARK_DONT_FOLLOW 0x00000004
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#define FAN_MARK_ONLYDIR 0x00000008
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#define FAN_MARK_ON_VFSMOUNT 0x00000010
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#define FAN_ALL_MARK_FLAGS (FAN_MARK_ADD |\
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FAN_MARK_REMOVE |\
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FAN_MARK_DONT_FOLLOW |\
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FAN_MARK_ONLYDIR)
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FAN_MARK_ONLYDIR |\
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FAN_MARK_ON_VFSMOUNT)
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/*
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* All of the events - we build the list by hand so that we can add flags in
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