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Linux File Locking on Network Files

Posted on 2014-11-13
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Last Modified: 2014-11-19
I am try to implement a file locking system within my application which is running in Linux.

I use flock to lock the file as shared (LOCK_SH) when reading and as exclusive (LOCK_EX) when writing.  I'm also perform the lock as non-blocking (LOCK_NB).

I tested the file locking of a networked file by running 2 instances of my application on the same PC simultaneously, and I can see that one will wait to write while the other is in the process of writing.

When I run one instance on one PC and another instance on another PC, I am unable to see that the either PC recognizes the network file as locked.

What is the proper way to get networked PCs to recognize when a file is locked?

I am currently running Fedora 19 and my application is written in C.
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Question by:sctccomm
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sarabande earned 1800 total points
ID: 40442064
you may think of setting up an nfs file system. see

http://nfs.sourceforge.net/

for more information.

Sara
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by:Duncan Roe
Duncan Roe earned 200 total points
ID: 40442179
When you mentioned networked file I assumed you were using NFS already. Is that not the case?
man nfs has quite a lot to say about file locking, especially between different clients
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Assisted Solution

by:sctccomm
sctccomm earned 0 total points
ID: 40443921
I was able to get the file locking to work.

Originally I used:  mount -t cifs //192.168.1.100/project /mnt/project

but this is just normal Windows file sharing, not NFS.

After installing and configuring NFS on my Windows server, I mounted the drive using:

mount -t nfs 192.168.1.100:/project /mnt/project

Now everything is working as expected.
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Author Closing Comment

by:sctccomm
ID: 40451911
Setting up an actual NFS was the solution.
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