3b6492df41
Increase the sizes of the volume ID to 64 bits and the vnode ID (inode number equivalent) to 96 bits to allow the support of YFS. This requires the iget comparator to check the vnode->fid rather than i_ino and i_generation as i_ino is not sufficiently capacious. It also requires this data to be placed into the vnode cache key for fscache. For the moment, just discard the top 32 bits of the vnode ID when returning it though stat. Signed-off-by: David Howells <dhowells@redhat.com>
73 lines
2 KiB
C
73 lines
2 KiB
C
/* AFS caching stuff
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*
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* Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/sched.h>
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#include "internal.h"
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static enum fscache_checkaux afs_vnode_cache_check_aux(void *cookie_netfs_data,
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const void *buffer,
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uint16_t buflen,
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loff_t object_size);
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struct fscache_netfs afs_cache_netfs = {
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.name = "afs",
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.version = 2,
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};
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struct fscache_cookie_def afs_cell_cache_index_def = {
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.name = "AFS.cell",
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.type = FSCACHE_COOKIE_TYPE_INDEX,
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};
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struct fscache_cookie_def afs_volume_cache_index_def = {
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.name = "AFS.volume",
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.type = FSCACHE_COOKIE_TYPE_INDEX,
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};
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struct fscache_cookie_def afs_vnode_cache_index_def = {
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.name = "AFS.vnode",
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.type = FSCACHE_COOKIE_TYPE_DATAFILE,
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.check_aux = afs_vnode_cache_check_aux,
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};
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/*
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* check that the auxiliary data indicates that the entry is still valid
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*/
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static enum fscache_checkaux afs_vnode_cache_check_aux(void *cookie_netfs_data,
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const void *buffer,
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uint16_t buflen,
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loff_t object_size)
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{
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struct afs_vnode *vnode = cookie_netfs_data;
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struct afs_vnode_cache_aux aux;
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_enter("{%llx,%x,%llx},%p,%u",
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vnode->fid.vnode, vnode->fid.unique, vnode->status.data_version,
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buffer, buflen);
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memcpy(&aux, buffer, sizeof(aux));
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/* check the size of the data is what we're expecting */
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if (buflen != sizeof(aux)) {
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_leave(" = OBSOLETE [len %hx != %zx]", buflen, sizeof(aux));
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return FSCACHE_CHECKAUX_OBSOLETE;
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}
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if (vnode->status.data_version != aux.data_version) {
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_leave(" = OBSOLETE [vers %llx != %llx]",
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aux.data_version, vnode->status.data_version);
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return FSCACHE_CHECKAUX_OBSOLETE;
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}
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_leave(" = SUCCESS");
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return FSCACHE_CHECKAUX_OKAY;
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}
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