I want to get the filesystem mount point for a file system in my kernel module, which is a stackable filesystem. Eg. if /home/ab/abc is a file and /home is mounted on a different filesystem I want to have a dentry or path struct to /home. I want to do this in a module without modifying kernel code. e.g. there is a file in /home/user/ and now I want to know in which partition this file is. For example this file might be in the partition same as "/" or this file might be in another partition mounted on /home or /home/user.
Asked
Active
Viewed 4,856 times
2 Answers
7
You can get the list of file systems from current->namespace. By iterating current->namespace->list (items being struct vfsmount) you can get all mounted file systems. vfsmount->mnt_mountpoint is the directory entry you want.
You can follow the code that prints /proc/mounts (e.g. base.c/mountstats_open, namespace.c/m_start) to get more details (e.g. some locking is needed).
I don't know if you can do it in a kernel module, however.
Sangeeth Saravanaraj
- 16,027
- 21
- 69
- 98
ugoren
- 16,023
- 3
- 35
- 65
-
Thanks for your reply. Actually I wanted to know how to know the mountpoint of a particular file. I have edited the question please if you could take a look at it. – gaurav Jan 04 '12 at 17:14
-
@gaurav please realize that there could be multiple mount points for any given inode. – Ahmed Masud May 16 '18 at 14:29
1
If someone still needs to "dereference" given path to its mount point there is follow_up function which does exactly this thing :) It operates on the struct path and changes it accordingly to its .mnt entry. Maybe someone will find it handy!
Edit: I've used it in the 5.6 kernel version. I don't know if it was always available (<5.6)
