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Full Discussion: concept of mount point
Top Forums UNIX for Dummies Questions & Answers concept of mount point Post 302075964 by Vikas Sood on Wednesday 7th of June 2006 10:14:22 PM
Old 06-07-2006
concept of mount point

Hi All

I Know it is a really basic and stupid question perhaps...But I am going bonkers..

I have following valid paths in my unix system:

1. /opt/cdedev/informatica/InfSrv/app/bin
2. /vikas/cdedev/app

Both refer to the same physical location. So if I created one file 'test' in first
path, when i cd to /vikas/cdedev/app and do a ls -ltr, i see the 'test' file

When I do a df -k . on 1 and 2 above, i get the same mount point which is as follows:

/vikas/cdedev/app

Now, I am perhaps taking a long shot, but the most logical reasoning I can give myself is mount point is nothign but actual physical location in hard drive whereas directories are logical pointers to mount points. So 1 and 2 above are logical pointers to the same physical location. In other words, they point to the same mount point.

I might be way off. In any case, can somebody throw some light on following:

a. concept of mount point as well as Unix file system?

b. Is it possible to see which directories refer to one particular mount point by some unix command?

Appreciate it much.
 

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MOUNT(2)							System Calls Manual							  MOUNT(2)

NAME
mount, umount - mount or umount a file system SYNOPSIS
#include <unistd.h> #include <sys/mount.h> int mount(char *special, char *name, int flag) int umount(char *name) DESCRIPTION
Mount() tells the system that the file system special is to be mounted on the file name, effectively overlaying name with the file tree on special. Name may of any type, except that if the root of special is a directory, then name must also be a directory. Special must be a block special file, except for loopback mounts. For loopback mounts a normal file or directory is used for special, which must be seen as the root of a virtual device. Flag is 0 for a read-write mount, 1 for read-only. Umount() removes the connection between a device and a mount point, name may refer to either of them. If more than one device is mounted on the same mount point then unmounting at the mount point removes the last mounted device, unmounting a device removes precisely that device. The unmount will only succeed if none of the files on the device are in use. Both calls may only be executed by the super-user. SEE ALSO
mount(1), umount(1). AUTHOR
Kees J. Bot (kjb@cs.vu.nl) MOUNT(2)
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