On Tuesday 31 August 2004 20:00, Shehjar Tikoo wrote: > Hi all. Hi there, > > I have a query regarding lookups in VFS.Im using > version 2.6.7. > > open_namei calls path_lookup, in case of a plain open, > which in turn calls __emul_lookup_dentry, > if the path is an absolute path. > In __emul_lookup_dentry theres a call to path_walk > which calls link_path_walk, However, before calling __emul_lookup_dentry, two lines above we do the following: which means that we mostly assign the current->fs->altroot dentry to the nd->dentry, i.e. we assign the alternative root dentry of the current process to the dentry of the nameidata nd struct. 875 nd->dentry = dget(current->fs->altroot); which means that we mostly assign the current->fs->altroot dentry to the nd->dentry, i.e. we assign the alternative root dentry of the current process to the dentry of the nameidata nd struct. What I can't tell you, though is, what exactly the alternative root is. :) > now inside > link_path_lookup you mean here link_path_walk > , nd->dentry->d_inode is being used to > arrive at the inode. > but i cant figure out where we set nd->dentry->inode > before we use it here. Thus, we assign the altroot->d_inode to the inode in link_path_walk. > > > Thanks > Shehjar > > Hope I can be of any help, Boris. > > > __________________________________ > Do you Yahoo!? > New and Improved Yahoo! Mail - 100MB free storage! > http://promotions.yahoo.com/new_mail > > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/
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