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Linux/fs/nfs/fscache-index.c

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  1 /* NFS FS-Cache index structure definition
  2  *
  3  * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
  4  * Written by David Howells (dhowells@redhat.com)
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public Licence
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the Licence, or (at your option) any later version.
 10  */
 11 
 12 #include <linux/init.h>
 13 #include <linux/kernel.h>
 14 #include <linux/sched.h>
 15 #include <linux/mm.h>
 16 #include <linux/nfs_fs.h>
 17 #include <linux/nfs_fs_sb.h>
 18 #include <linux/in6.h>
 19 #include <linux/iversion.h>
 20 
 21 #include "internal.h"
 22 #include "fscache.h"
 23 
 24 #define NFSDBG_FACILITY         NFSDBG_FSCACHE
 25 
 26 /*
 27  * Define the NFS filesystem for FS-Cache.  Upon registration FS-Cache sticks
 28  * the cookie for the top-level index object for NFS into here.  The top-level
 29  * index can than have other cache objects inserted into it.
 30  */
 31 struct fscache_netfs nfs_fscache_netfs = {
 32         .name           = "nfs",
 33         .version        = 0,
 34 };
 35 
 36 /*
 37  * Register NFS for caching
 38  */
 39 int nfs_fscache_register(void)
 40 {
 41         return fscache_register_netfs(&nfs_fscache_netfs);
 42 }
 43 
 44 /*
 45  * Unregister NFS for caching
 46  */
 47 void nfs_fscache_unregister(void)
 48 {
 49         fscache_unregister_netfs(&nfs_fscache_netfs);
 50 }
 51 
 52 /*
 53  * Define the server object for FS-Cache.  This is used to describe a server
 54  * object to fscache_acquire_cookie().  It is keyed by the NFS protocol and
 55  * server address parameters.
 56  */
 57 const struct fscache_cookie_def nfs_fscache_server_index_def = {
 58         .name           = "NFS.server",
 59         .type           = FSCACHE_COOKIE_TYPE_INDEX,
 60 };
 61 
 62 /*
 63  * Define the superblock object for FS-Cache.  This is used to describe a
 64  * superblock object to fscache_acquire_cookie().  It is keyed by all the NFS
 65  * parameters that might cause a separate superblock.
 66  */
 67 const struct fscache_cookie_def nfs_fscache_super_index_def = {
 68         .name           = "NFS.super",
 69         .type           = FSCACHE_COOKIE_TYPE_INDEX,
 70 };
 71 
 72 /*
 73  * Consult the netfs about the state of an object
 74  * - This function can be absent if the index carries no state data
 75  * - The netfs data from the cookie being used as the target is
 76  *   presented, as is the auxiliary data
 77  */
 78 static
 79 enum fscache_checkaux nfs_fscache_inode_check_aux(void *cookie_netfs_data,
 80                                                   const void *data,
 81                                                   uint16_t datalen,
 82                                                   loff_t object_size)
 83 {
 84         struct nfs_fscache_inode_auxdata auxdata;
 85         struct nfs_inode *nfsi = cookie_netfs_data;
 86 
 87         if (datalen != sizeof(auxdata))
 88                 return FSCACHE_CHECKAUX_OBSOLETE;
 89 
 90         memset(&auxdata, 0, sizeof(auxdata));
 91         auxdata.mtime = timespec64_to_timespec(nfsi->vfs_inode.i_mtime);
 92         auxdata.ctime = timespec64_to_timespec(nfsi->vfs_inode.i_ctime);
 93 
 94         if (NFS_SERVER(&nfsi->vfs_inode)->nfs_client->rpc_ops->version == 4)
 95                 auxdata.change_attr = inode_peek_iversion_raw(&nfsi->vfs_inode);
 96 
 97         if (memcmp(data, &auxdata, datalen) != 0)
 98                 return FSCACHE_CHECKAUX_OBSOLETE;
 99 
100         return FSCACHE_CHECKAUX_OKAY;
101 }
102 
103 /*
104  * Get an extra reference on a read context.
105  * - This function can be absent if the completion function doesn't require a
106  *   context.
107  * - The read context is passed back to NFS in the event that a data read on the
108  *   cache fails with EIO - in which case the server must be contacted to
109  *   retrieve the data, which requires the read context for security.
110  */
111 static void nfs_fh_get_context(void *cookie_netfs_data, void *context)
112 {
113         get_nfs_open_context(context);
114 }
115 
116 /*
117  * Release an extra reference on a read context.
118  * - This function can be absent if the completion function doesn't require a
119  *   context.
120  */
121 static void nfs_fh_put_context(void *cookie_netfs_data, void *context)
122 {
123         if (context)
124                 put_nfs_open_context(context);
125 }
126 
127 /*
128  * Define the inode object for FS-Cache.  This is used to describe an inode
129  * object to fscache_acquire_cookie().  It is keyed by the NFS file handle for
130  * an inode.
131  *
132  * Coherency is managed by comparing the copies of i_size, i_mtime and i_ctime
133  * held in the cache auxiliary data for the data storage object with those in
134  * the inode struct in memory.
135  */
136 const struct fscache_cookie_def nfs_fscache_inode_object_def = {
137         .name           = "NFS.fh",
138         .type           = FSCACHE_COOKIE_TYPE_DATAFILE,
139         .check_aux      = nfs_fscache_inode_check_aux,
140         .get_context    = nfs_fh_get_context,
141         .put_context    = nfs_fh_put_context,
142 };
143 

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