From mboxrd@z Thu Jan  1 00:00:00 1970
From: riel@surriel.com (Rik van Riel)
Date: Wed, 31 May 2017 13:30:59 -0400
Subject: Is vnode number also limit system-wide number of open file?
In-Reply-To: <20170531133754.GA9534@HP>
References: <20170531133754.GA9534@HP>
Message-ID: <1496251859.29205.90.camel@surriel.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

On Wed, 2017-05-31 at 21:37 +0800, Yubin Ruan wrote:
> I notice that there is a?
> ????
> 	unsigned long		i_ino;
> 
> in definition of `struct inode' [1], which is the virtual filesystem
> inode.
> Does that mean "inode number" and is it used for indexing in the
> system-wide
> inode table??
> 
> If that is the case, would that limit the number of open file in
> Linux?

Those numbers are unrelated.

The i_ino number is the inode number within each
filesystem, and different filesystems can have
inodes with the same inode numbers.

File descriptors (open files) point to a struct inode
somewhere in memory. The same file can be opened many
times (all programs opening libc.so). Many files will
not be opened by any program at all.

-- 
All Rights Reversed.
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