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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 | /* * Copyright (c) 2002 Red Hat, Inc. All rights reserved. * * This software may be freely redistributed under the terms of the * GNU General Public License. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * Authors: David Woodhouse <dwmw2@cambridge.redhat.com> * David Howells <dhowells@redhat.com> * */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include "server.h" #include "vnode.h" #include "internal.h" #include "cmservice.h" /*****************************************************************************/ /* * allow the fileserver to request callback state (re-)initialisation */ int SRXAFSCM_InitCallBackState(struct afs_server *server) { struct list_head callbacks; _enter("%p", server); INIT_LIST_HEAD(&callbacks); /* transfer the callback list from the server to a temp holding area */ spin_lock(&server->cb_lock); list_add(&callbacks, &server->cb_promises); list_del_init(&server->cb_promises); /* munch our way through the list, grabbing the inode, dropping all the * locks and regetting them in the right order */ while (!list_empty(&callbacks)) { struct afs_vnode *vnode; struct inode *inode; vnode = list_entry(callbacks.next, struct afs_vnode, cb_link); list_del_init(&vnode->cb_link); /* try and grab the inode - may fail */ inode = igrab(AFS_VNODE_TO_I(vnode)); if (inode) { int release = 0; spin_unlock(&server->cb_lock); spin_lock(&vnode->lock); if (vnode->cb_server == server) { vnode->cb_server = NULL; afs_kafstimod_del_timer(&vnode->cb_timeout); spin_lock(&afs_cb_hash_lock); list_del_init(&vnode->cb_hash_link); spin_unlock(&afs_cb_hash_lock); release = 1; } spin_unlock(&vnode->lock); iput(inode); afs_put_server(server); spin_lock(&server->cb_lock); } } spin_unlock(&server->cb_lock); _leave(" = 0"); return 0; } /* end SRXAFSCM_InitCallBackState() */ /*****************************************************************************/ /* * allow the fileserver to break callback promises */ int SRXAFSCM_CallBack(struct afs_server *server, size_t count, struct afs_callback callbacks[]) { _enter("%p,%u,", server, count); for (; count > 0; callbacks++, count--) { struct afs_vnode *vnode = NULL; struct inode *inode = NULL; int valid = 0; _debug("- Fid { vl=%08x n=%u u=%u } CB { v=%u x=%u t=%u }", callbacks->fid.vid, callbacks->fid.vnode, callbacks->fid.unique, callbacks->version, callbacks->expiry, callbacks->type ); /* find the inode for this fid */ spin_lock(&afs_cb_hash_lock); list_for_each_entry(vnode, &afs_cb_hash(server, &callbacks->fid), cb_hash_link) { if (memcmp(&vnode->fid, &callbacks->fid, sizeof(struct afs_fid)) != 0) continue; /* right vnode, but is it same server? */ if (vnode->cb_server != server) break; /* no */ /* try and nail the inode down */ inode = igrab(AFS_VNODE_TO_I(vnode)); break; } spin_unlock(&afs_cb_hash_lock); if (inode) { /* we've found the record for this vnode */ spin_lock(&vnode->lock); if (vnode->cb_server == server) { /* the callback _is_ on the calling server */ vnode->cb_server = NULL; valid = 1; afs_kafstimod_del_timer(&vnode->cb_timeout); vnode->flags |= AFS_VNODE_CHANGED; spin_lock(&server->cb_lock); list_del_init(&vnode->cb_link); spin_unlock(&server->cb_lock); spin_lock(&afs_cb_hash_lock); list_del_init(&vnode->cb_hash_link); spin_unlock(&afs_cb_hash_lock); } spin_unlock(&vnode->lock); if (valid) { invalidate_remote_inode(inode); afs_put_server(server); } iput(inode); } } _leave(" = 0"); return 0; } /* end SRXAFSCM_CallBack() */ /*****************************************************************************/ /* * allow the fileserver to see if the cache manager is still alive */ int SRXAFSCM_Probe(struct afs_server *server) { _debug("SRXAFSCM_Probe(%p)\n", server); return 0; } /* end SRXAFSCM_Probe() */ |