Nfs readdir

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== nfs_readdir() == * fs/nfs/dir.c * dentry defined in include/linux/dcache.h * file defined in include/linux/fs.h * path defined in include/linux/path.h * nfs_entry defined in /include/linux/nfs_xdr.h * make a new dentry: my_entry ** set the cookie to the previous file, allocate a file handle and attribute struct, mark that we are not at the end of the file ** If allocations failed, goto out_alloc_failed * Block silly renames from running * call nfs_revalidate_mapping (fs/nfs/inode.c) to validate the page cache ** if there is an error revalidating the cache, goto out * Begin a loop over directory entries * while we have not reached the end of the directory file: ** Search the page cache for the requested page (dir.c: readdir_search_pagecache) ** if searching results in a bad cookie (EBADCOOKIE), it could mean that we are at the end of the directory or that the file has been deleted *** ask the server fore the next file and add to the page cache using filldir (dir.c: uncached_readdir) *** if the response is good, go to the beginning of the while loop and look up the next entry, otherwise break out of the loop ** if searching results in a too small error (ETOOSMALL) and if we are doing a readdir plus *** clear the "NFS_INO_ADVISE_RDPLUS" flag contained in the nfs_inode *** "zap" the cache (invalidate the nfs_inode) ** if res indicates any other error, break out of the loop ** add the page to the cache *** break out of the loop if there is a problem adding the page to the cache * out: ** unblock (allow) silly renames ** set response is non zero, set it equal to zero * out_alloc_failed: ** free file handle and attr structs in my_entry ** print a message stating what is being returned ** return the response code

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