cregit-Linux how code gets into the kernel

Release 4.10 fs/nfs/getroot.c

Directory: fs/nfs
/* getroot.c: get the root dentry for an NFS mount
 *
 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/init.h>

#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/stats.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/lockd/bind.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
#include <linux/vfs.h>
#include <linux/namei.h>
#include <linux/security.h>

#include <linux/uaccess.h>

#include "internal.h"


#define NFSDBG_FACILITY		NFSDBG_CLIENT

/*
 * Set the superblock root dentry.
 * Note that this function frees the inode in case of error.
 */

static int nfs_superblock_set_dummy_root(struct super_block *sb, struct inode *inode) { /* The mntroot acts as the dummy root dentry for this superblock */ if (sb->s_root == NULL) { sb->s_root = d_make_root(inode); if (sb->s_root == NULL) return -ENOMEM; ihold(inode); /* * Ensure that this dentry is invisible to d_find_alias(). * Otherwise, it may be spliced into the tree by * d_splice_alias if a parent directory from the same * filesystem gets mounted at a later time. * This again causes shrink_dcache_for_umount_subtree() to * Oops, since the test for IS_ROOT() will fail. */ spin_lock(&d_inode(sb->s_root)->i_lock); spin_lock(&sb->s_root->d_lock); hlist_del_init(&sb->s_root->d_u.d_alias); spin_unlock(&sb->s_root->d_lock); spin_unlock(&d_inode(sb->s_root)->i_lock); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
trond myklebusttrond myklebust6960.00%220.00%
nick pigginnick piggin3429.57%220.00%
al viroal viro65.22%550.00%
david howellsdavid howells65.22%110.00%
Total115100.00%10100.00%

/* * get an NFS2/NFS3 root dentry from the root filehandle */
struct dentry *nfs_get_root(struct super_block *sb, struct nfs_fh *mntfh, const char *devname) { struct nfs_server *server = NFS_SB(sb); struct nfs_fsinfo fsinfo; struct dentry *ret; struct inode *inode; void *name = kstrdup(devname, GFP_KERNEL); int error; if (!name) return ERR_PTR(-ENOMEM); /* get the actual root for this mount */ fsinfo.fattr = nfs_alloc_fattr(); if (fsinfo.fattr == NULL) { kfree(name); return ERR_PTR(-ENOMEM); } error = server->nfs_client->rpc_ops->getroot(server, mntfh, &fsinfo); if (error < 0) { dprintk("nfs_get_root: getattr error = %d\n", -error); ret = ERR_PTR(error); goto out; } inode = nfs_fhget(sb, mntfh, fsinfo.fattr, NULL); if (IS_ERR(inode)) { dprintk("nfs_get_root: get root inode failed\n"); ret = ERR_CAST(inode); goto out; } error = nfs_superblock_set_dummy_root(sb, inode); if (error != 0) { ret = ERR_PTR(error); goto out; } /* root dentries normally start off anonymous and get spliced in later * if the dentry tree reaches them; however if the dentry already * exists, we'll pick it up at this point and use it as the root */ ret = d_obtain_root(inode); if (IS_ERR(ret)) { dprintk("nfs_get_root: get root dentry failed\n"); goto out; } security_d_instantiate(ret, inode); spin_lock(&ret->d_lock); if (IS_ROOT(ret) && !ret->d_fsdata && !(ret->d_flags & DCACHE_NFSFS_RENAMED)) { ret->d_fsdata = name; name = NULL; } spin_unlock(&ret->d_lock); out: kfree(name); nfs_free_fattr(fsinfo.fattr); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
david howellsdavid howells14245.81%327.27%
al viroal viro8427.10%218.18%
trond myklebusttrond myklebust7323.55%218.18%
kinglong meekinglong mee51.61%19.09%
christoph hellwigchristoph hellwig30.97%19.09%
david quigleydavid quigley20.65%19.09%
j. bruce fieldsj. bruce fields10.32%19.09%
Total310100.00%11100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
david howellsdavid howells21343.03%418.18%
trond myklebusttrond myklebust14328.89%313.64%
al viroal viro9018.18%731.82%
nick pigginnick piggin346.87%29.09%
kinglong meekinglong mee51.01%14.55%
stanislav kinsburskystanislav kinsbursky30.61%14.55%
christoph hellwigchristoph hellwig30.61%14.55%
david quigleydavid quigley20.40%14.55%
linus torvaldslinus torvalds10.20%14.55%
j. bruce fieldsj. bruce fields10.20%14.55%
Total495100.00%22100.00%
Directory: fs/nfs
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