On Sat, Apr 26, 2008 at 12:45:12PM +0530, Pranav Peshwe wrote: > How does the kernel figure out that a particular file/library is already > opened and mmaped to a particular address ? Does it scan through the list of > open files or is there any information kept in the inode for the file or is > there some other way ? When it tries to open a file it will first look up the path, then figure out which inode belongs to that file. Next it will look up if that particular inode is already opened by scanning the list of open files (which basically is a list of in-memory inodes) and if it is, it will increase the refcount for that inode. Because all references to files are done by inode and not by path, it will even work when you have hardlinked files. The in-memory inode has a refcount, the on-disk inode will not change when a file is merely opened. Erik -- Erik Mouw -- mouw@xxxxxxxxxxxx
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