This source file includes following definitions.
- nfs_superblock_set_dummy_root
- nfs_get_root
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8 #include <linux/module.h>
9 #include <linux/init.h>
10
11 #include <linux/time.h>
12 #include <linux/kernel.h>
13 #include <linux/mm.h>
14 #include <linux/string.h>
15 #include <linux/stat.h>
16 #include <linux/errno.h>
17 #include <linux/unistd.h>
18 #include <linux/sunrpc/clnt.h>
19 #include <linux/sunrpc/stats.h>
20 #include <linux/nfs_fs.h>
21 #include <linux/nfs_mount.h>
22 #include <linux/lockd/bind.h>
23 #include <linux/seq_file.h>
24 #include <linux/mount.h>
25 #include <linux/vfs.h>
26 #include <linux/namei.h>
27 #include <linux/security.h>
28
29 #include <linux/uaccess.h>
30
31 #include "internal.h"
32
33 #define NFSDBG_FACILITY NFSDBG_CLIENT
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38
39 static int nfs_superblock_set_dummy_root(struct super_block *sb, struct inode *inode)
40 {
41
42 if (sb->s_root == NULL) {
43 sb->s_root = d_make_root(inode);
44 if (sb->s_root == NULL)
45 return -ENOMEM;
46 ihold(inode);
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54
55 spin_lock(&d_inode(sb->s_root)->i_lock);
56 spin_lock(&sb->s_root->d_lock);
57 hlist_del_init(&sb->s_root->d_u.d_alias);
58 spin_unlock(&sb->s_root->d_lock);
59 spin_unlock(&d_inode(sb->s_root)->i_lock);
60 }
61 return 0;
62 }
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66
67 struct dentry *nfs_get_root(struct super_block *sb, struct nfs_fh *mntfh,
68 const char *devname)
69 {
70 struct nfs_server *server = NFS_SB(sb);
71 struct nfs_fsinfo fsinfo;
72 struct dentry *ret;
73 struct inode *inode;
74 void *name = kstrdup(devname, GFP_KERNEL);
75 int error;
76
77 if (!name)
78 return ERR_PTR(-ENOMEM);
79
80
81 fsinfo.fattr = nfs_alloc_fattr();
82 if (fsinfo.fattr == NULL) {
83 kfree(name);
84 return ERR_PTR(-ENOMEM);
85 }
86
87 error = server->nfs_client->rpc_ops->getroot(server, mntfh, &fsinfo);
88 if (error < 0) {
89 dprintk("nfs_get_root: getattr error = %d\n", -error);
90 ret = ERR_PTR(error);
91 goto out;
92 }
93
94 inode = nfs_fhget(sb, mntfh, fsinfo.fattr, NULL);
95 if (IS_ERR(inode)) {
96 dprintk("nfs_get_root: get root inode failed\n");
97 ret = ERR_CAST(inode);
98 goto out;
99 }
100
101 error = nfs_superblock_set_dummy_root(sb, inode);
102 if (error != 0) {
103 ret = ERR_PTR(error);
104 goto out;
105 }
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111 ret = d_obtain_root(inode);
112 if (IS_ERR(ret)) {
113 dprintk("nfs_get_root: get root dentry failed\n");
114 goto out;
115 }
116
117 security_d_instantiate(ret, inode);
118 spin_lock(&ret->d_lock);
119 if (IS_ROOT(ret) && !ret->d_fsdata &&
120 !(ret->d_flags & DCACHE_NFSFS_RENAMED)) {
121 ret->d_fsdata = name;
122 name = NULL;
123 }
124 spin_unlock(&ret->d_lock);
125 out:
126 kfree(name);
127 nfs_free_fattr(fsinfo.fattr);
128 return ret;
129 }