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TOMOYO Linux Cross Reference
Linux/fs/nfs/export.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Copyright (c) 2015, Primary Data, Inc. All rights reserved.
  4  *
  5  * Tao Peng <bergwolf@primarydata.com>
  6  */
  7 #include <linux/dcache.h>
  8 #include <linux/exportfs.h>
  9 #include <linux/nfs.h>
 10 #include <linux/nfs_fs.h>
 11 
 12 #include "internal.h"
 13 #include "nfstrace.h"
 14 
 15 #define NFSDBG_FACILITY         NFSDBG_VFS
 16 
 17 enum {
 18         FILEID_HIGH_OFF = 0,    /* inode fileid high */
 19         FILEID_LOW_OFF,         /* inode fileid low */
 20         FILE_I_TYPE_OFF,        /* inode type */
 21         EMBED_FH_OFF            /* embeded server fh */
 22 };
 23 
 24 
 25 static struct nfs_fh *nfs_exp_embedfh(__u32 *p)
 26 {
 27         return (struct nfs_fh *)(p + EMBED_FH_OFF);
 28 }
 29 
 30 /*
 31  * Let's break subtree checking for now... otherwise we'll have to embed parent fh
 32  * but there might not be enough space.
 33  */
 34 static int
 35 nfs_encode_fh(struct inode *inode, __u32 *p, int *max_len, struct inode *parent)
 36 {
 37         struct nfs_fh *server_fh = NFS_FH(inode);
 38         struct nfs_fh *clnt_fh = nfs_exp_embedfh(p);
 39         size_t fh_size = offsetof(struct nfs_fh, data) + server_fh->size;
 40         int len = EMBED_FH_OFF + XDR_QUADLEN(fh_size);
 41 
 42         dprintk("%s: max fh len %d inode %p parent %p",
 43                 __func__, *max_len, inode, parent);
 44 
 45         if (*max_len < len || IS_AUTOMOUNT(inode)) {
 46                 dprintk("%s: fh len %d too small, required %d\n",
 47                         __func__, *max_len, len);
 48                 *max_len = len;
 49                 return FILEID_INVALID;
 50         }
 51 
 52         p[FILEID_HIGH_OFF] = NFS_FILEID(inode) >> 32;
 53         p[FILEID_LOW_OFF] = NFS_FILEID(inode);
 54         p[FILE_I_TYPE_OFF] = inode->i_mode & S_IFMT;
 55         p[len - 1] = 0; /* Padding */
 56         nfs_copy_fh(clnt_fh, server_fh);
 57         *max_len = len;
 58         dprintk("%s: result fh fileid %llu mode %u size %d\n",
 59                 __func__, NFS_FILEID(inode), inode->i_mode, *max_len);
 60         return *max_len;
 61 }
 62 
 63 static struct dentry *
 64 nfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
 65                  int fh_len, int fh_type)
 66 {
 67         struct nfs4_label *label = NULL;
 68         struct nfs_fattr *fattr = NULL;
 69         struct nfs_fh *server_fh = nfs_exp_embedfh(fid->raw);
 70         size_t fh_size = offsetof(struct nfs_fh, data) + server_fh->size;
 71         const struct nfs_rpc_ops *rpc_ops;
 72         struct dentry *dentry;
 73         struct inode *inode;
 74         int len = EMBED_FH_OFF + XDR_QUADLEN(fh_size);
 75         u32 *p = fid->raw;
 76         int ret;
 77 
 78         /* NULL translates to ESTALE */
 79         if (fh_len < len || fh_type != len)
 80                 return NULL;
 81 
 82         fattr = nfs_alloc_fattr();
 83         if (fattr == NULL) {
 84                 dentry = ERR_PTR(-ENOMEM);
 85                 goto out;
 86         }
 87 
 88         fattr->fileid = ((u64)p[FILEID_HIGH_OFF] << 32) + p[FILEID_LOW_OFF];
 89         fattr->mode = p[FILE_I_TYPE_OFF];
 90         fattr->valid |= NFS_ATTR_FATTR_FILEID | NFS_ATTR_FATTR_TYPE;
 91 
 92         dprintk("%s: fileid %llu mode %d\n", __func__, fattr->fileid, fattr->mode);
 93 
 94         inode = nfs_ilookup(sb, fattr, server_fh);
 95         if (inode)
 96                 goto out_found;
 97 
 98         label = nfs4_label_alloc(NFS_SB(sb), GFP_KERNEL);
 99         if (IS_ERR(label)) {
100                 dentry = ERR_CAST(label);
101                 goto out_free_fattr;
102         }
103 
104         rpc_ops = NFS_SB(sb)->nfs_client->rpc_ops;
105         ret = rpc_ops->getattr(NFS_SB(sb), server_fh, fattr, label, NULL);
106         if (ret) {
107                 dprintk("%s: getattr failed %d\n", __func__, ret);
108                 dentry = ERR_PTR(ret);
109                 goto out_free_label;
110         }
111 
112         inode = nfs_fhget(sb, server_fh, fattr, label);
113 
114 out_found:
115         dentry = d_obtain_alias(inode);
116 
117 out_free_label:
118         nfs4_label_free(label);
119 out_free_fattr:
120         nfs_free_fattr(fattr);
121 out:
122         return dentry;
123 }
124 
125 static struct dentry *
126 nfs_get_parent(struct dentry *dentry)
127 {
128         int ret;
129         struct inode *inode = d_inode(dentry), *pinode;
130         struct super_block *sb = inode->i_sb;
131         struct nfs_server *server = NFS_SB(sb);
132         struct nfs_fattr *fattr = NULL;
133         struct nfs4_label *label = NULL;
134         struct dentry *parent;
135         struct nfs_rpc_ops const *ops = server->nfs_client->rpc_ops;
136         struct nfs_fh fh;
137 
138         if (!ops->lookupp)
139                 return ERR_PTR(-EACCES);
140 
141         fattr = nfs_alloc_fattr();
142         if (fattr == NULL) {
143                 parent = ERR_PTR(-ENOMEM);
144                 goto out;
145         }
146 
147         label = nfs4_label_alloc(server, GFP_KERNEL);
148         if (IS_ERR(label)) {
149                 parent = ERR_CAST(label);
150                 goto out_free_fattr;
151         }
152 
153         ret = ops->lookupp(inode, &fh, fattr, label);
154         if (ret) {
155                 parent = ERR_PTR(ret);
156                 goto out_free_label;
157         }
158 
159         pinode = nfs_fhget(sb, &fh, fattr, label);
160         parent = d_obtain_alias(pinode);
161 out_free_label:
162         nfs4_label_free(label);
163 out_free_fattr:
164         nfs_free_fattr(fattr);
165 out:
166         return parent;
167 }
168 
169 const struct export_operations nfs_export_ops = {
170         .encode_fh = nfs_encode_fh,
171         .fh_to_dentry = nfs_fh_to_dentry,
172         .get_parent = nfs_get_parent,
173 };
174 

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