/* AFS vnode management * * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include #include #include #include #include #include "internal.h" #if 0 static noinline bool dump_tree_aux(struct rb_node *node, struct rb_node *parent, int depth, char lr) { struct afs_vnode *vnode; bool bad = false; if (!node) return false; if (node->rb_left) bad = dump_tree_aux(node->rb_left, node, depth + 2, '/'); vnode = rb_entry(node, struct afs_vnode, cb_promise); _debug("%c %*.*s%c%p {%d}", rb_is_red(node) ? 'R' : 'B', depth, depth, "", lr, vnode, vnode->cb_expires_at); if (rb_parent(node) != parent) { printk("BAD: %p != %p\n", rb_parent(node), parent); bad = true; } if (node->rb_right) bad |= dump_tree_aux(node->rb_right, node, depth + 2, '\\'); return bad; } static noinline void dump_tree(const char *name, struct afs_server *server) { _enter("%s", name); if (dump_tree_aux(server->cb_promises.rb_node, NULL, 0, '-')) BUG(); } #endif /* * insert a vnode into the backing server's vnode tree */ static void afs_install_vnode(struct afs_vnode *vnode, struct afs_server *server) { struct afs_server *old_server = vnode->server; struct afs_vnode *xvnode; struct rb_node *parent, **p; _enter("%p,%p", vnode, server); if (old_server) { spin_lock(&old_server->fs_lock); rb_erase(&vnode->server_rb, &old_server->fs_vnodes); spin_unlock(&old_server->fs_lock); } afs_get_server(server); vnode->server = server; afs_put_server(old_server); /* insert into the server's vnode tree in FID order */ spin_lock(&server->fs_lock); parent = NULL; p = &server->fs_vnodes.rb_node; while (*p) { parent = *p; xvnode = rb_entry(parent, struct afs_vnode, server_rb); if (vnode->fid.vid < xvnode->fid.vid) p = &(*p)->rb_left; else if (vnode->fid.vid > xvnode->fid.vid) p = &(*p)->rb_right; else if (vnode->fid.vnode < xvnode->fid.vnode) p = &(*p)->rb_left; else if (vnode->fid.vnode > xvnode->fid.vnode) p = &(*p)->rb_right; else if (vnode->fid.unique < xvnode->fid.unique) p = &(*p)->rb_left; else if (vnode->fid.unique > xvnode->fid.unique) p = &(*p)->rb_right; else BUG(); /* can't happen unless afs_iget() malfunctions */ } rb_link_node(&vnode->server_rb, parent, p); rb_insert_color(&vnode->server_rb, &server->fs_vnodes); spin_unlock(&server->fs_lock); _leave(""); } /* * insert a vnode into the promising server's update/expiration tree * - caller must hold vnode->lock */ static void afs_vnode_note_promise(struct afs_vnode *vnode, struct afs_server *server) { struct afs_server *old_server; struct afs_vnode *xvnode; struct rb_node *parent, **p; _enter("%p,%p", vnode, server); ASSERT(server != NULL); old_server = vnode->server; if (vnode->cb_promised) { if (server == old_server && vnode->cb_expires == vnode->cb_expires_at) { _leave(" [no change]"); return; } spin_lock(&old_server->cb_lock); if (vnode->cb_promised) { _debug("delete"); rb_erase(&vnode->cb_promise, &old_server->cb_promises); vnode->cb_promised = false; } spin_unlock(&old_server->cb_lock); } if (vnode->server != server) afs_install_vnode(vnode, server); vnode->cb_expires_at = vnode->cb_expires; _debug("PROMISE on %p {%lu}", vnode, (unsigned long) vnode->cb_expires_at); /* abuse an RB-tree to hold the expiration order (we may have multiple * items with the same expiration time) */ spin_lock(&server->cb_lock); parent = NULL; p = &server->cb_promises.rb_node; while (*p) { parent = *p; xvnode = rb_entry(parent, struct afs_vnode, cb_promise); if (vnode->cb_expires_at < xvnode->cb_expires_at) p = &(*p)->rb_left; else p = &(*p)->rb_right; } rb_link_node(&vnode->cb_promise, parent, p); rb_insert_color(&vnode->cb_promise, &server->cb_promises); vnode->cb_promised = true; spin_unlock(&server->cb_lock); _leave(""); } /* * handle remote file deletion by discarding the 
.. This work is licensed under a Creative Commons Attribution 4.0 International License.
.. http://creativecommons.org/licenses/by/4.0
.. (c) 2016 OPNFV.


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Doctor
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.. toctree::
   :maxdepth: 2
   :numbered:

   ./installationprocedure/index.rst
   ./design/index.rst
   ./manuals/index.rst
   ./requirements/index.rst
   ./scenarios/index.rst
   ./userguide/index.rst

Indices
=======
* :ref:`search`
(&dvnode->lock); _leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt); return PTR_ERR(server); } /* * create a symbolic link */ int afs_vnode_symlink(struct afs_vnode *vnode, struct key *key, const char *name, const char *content, struct afs_fid *newfid, struct afs_file_status *newstatus, struct afs_server **_server) { struct afs_server *server; int ret; _enter("%s{%x:%u.%u},%x,%s,%s,,,", vnode->volume->vlocation->vldb.name, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique, key_serial(key), name, content); /* this op will fetch the status on the directory we're creating in */ spin_lock(&vnode->lock); vnode->update_cnt++; spin_unlock(&vnode->lock); do { /* pick a server to query */ server = afs_volume_pick_fileserver(vnode); if (IS_ERR(server)) goto no_server; _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); ret = afs_fs_symlink(server, key, vnode, name, content, newfid, newstatus, &afs_sync_call); } while (!afs_volume_release_fileserver(vnode, server, ret)); /* adjust the flags */ if (ret == 0) { afs_vnode_finalise_status_update(vnode, server); *_server = server; } else { afs_vnode_status_update_failed(vnode, ret); *_server = NULL; } _leave(" = %d [cnt %d]", ret, vnode->update_cnt); return ret; no_server: spin_lock(&vnode->lock); vnode->update_cnt--; ASSERTCMP(vnode->update_cnt, >=, 0); spin_unlock(&vnode->lock); _leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt); return PTR_ERR(server); } /* * rename a file */ int afs_vnode_rename(struct afs_vnode *orig_dvnode, struct afs_vnode *new_dvnode, struct key *key, const char *orig_name, const char *new_name) { struct afs_server *server; int ret; _enter("%s{%x:%u.%u},%s{%u,%u,%u},%x,%s,%s", orig_dvnode->volume->vlocation->vldb.name, orig_dvnode->fid.vid, orig_dvnode->fid.vnode, orig_dvnode->fid.unique, new_dvnode->volume->vlocation->vldb.name, new_dvnode->fid.vid, new_dvnode->fid.vnode, new_dvnode->fid.unique, key_serial(key), orig_name, new_name); /* this op will fetch the status on both the directories we're dealing * with */ spin_lock(&orig_dvnode->lock); orig_dvnode->update_cnt++; spin_unlock(&orig_dvnode->lock); if (new_dvnode != orig_dvnode) { spin_lock(&new_dvnode->lock); new_dvnode->update_cnt++; spin_unlock(&new_dvnode->lock); } do { /* pick a server to query */ server = afs_volume_pick_fileserver(orig_dvnode); if (IS_ERR(server)) goto no_server; _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); ret = afs_fs_rename(server, key, orig_dvnode, orig_name, new_dvnode, new_name, &afs_sync_call); } while (!afs_volume_release_fileserver(orig_dvnode, server, ret)); /* adjust the flags */ if (ret == 0) { afs_vnode_finalise_status_update(orig_dvnode, server); if (new_dvnode != orig_dvnode) afs_vnode_finalise_status_update(new_dvnode, server); afs_put_server(server); } else { afs_vnode_status_update_failed(orig_dvnode, ret); if (new_dvnode != orig_dvnode) afs_vnode_status_update_failed(new_dvnode, ret); } _leave(" = %d [cnt %d]", ret, orig_dvnode->update_cnt); return ret; no_server: spin_lock(&orig_dvnode->lock); orig_dvnode->update_cnt--; ASSERTCMP(orig_dvnode->update_cnt, >=, 0); spin_unlock(&orig_dvnode->lock); if (new_dvnode != orig_dvnode) { spin_lock(&new_dvnode->lock); new_dvnode->update_cnt--; ASSERTCMP(new_dvnode->update_cnt, >=, 0); spin_unlock(&new_dvnode->lock); } _leave(" = %ld [cnt %d]", PTR_ERR(server), orig_dvnode->update_cnt); return PTR_ERR(server); } /* * write to a file */ int afs_vnode_store_data(struct afs_writeback *wb, pgoff_t first, pgoff_t last, unsigned offset, unsigned to) { struct afs_server *server; struct afs_vnode *vnode = wb->vnode; int ret; _enter("%s{%x:%u.%u},%x,%lx,%lx,%x,%x", vnode->volume->vlocation->vldb.name, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique, key_serial(wb->key), first, last, offset, to); /* this op will fetch the status */ spin_lock(&vnode->lock); vnode->update_cnt++; spin_unlock(&vnode->lock); do { /* pick a server to query */ server = afs_volume_pick_fileserver(vnode); if (IS_ERR(server)) goto no_server; _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); ret = afs_fs_store_data(server, wb, first, last, offset, to, &afs_sync_call); } while (!afs_volume_release_fileserver(vnode, server, ret)); /* adjust the flags */ if (ret == 0) { afs_vnode_finalise_status_update(vnode, server); afs_put_server(server); } else { afs_vnode_status_update_failed(vnode, ret); } _leave(" = %d", ret); return ret; no_server: spin_lock(&vnode->lock); vnode->update_cnt--; ASSERTCMP(vnode->update_cnt, >=, 0); spin_unlock(&vnode->lock); return PTR_ERR(server); } /* * set the attributes on a file */ int afs_vnode_setattr(struct afs_vnode *vnode, struct key *key, struct iattr *attr) { struct afs_server *server; int ret; _enter("%s{%x:%u.%u},%x", vnode->volume->vlocation->vldb.name, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique, key_serial(key)); /* this op will fetch the status */ spin_lock(&vnode->lock); vnode->update_cnt++; spin_unlock(&vnode->lock); do { /* pick a server to query */ server = afs_volume_pick_fileserver(vnode); if (IS_ERR(server)) goto no_server; _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); ret = afs_fs_setattr(server, key, vnode, attr, &afs_sync_call); } while (!afs_volume_release_fileserver(vnode, server, ret)); /* adjust the flags */ if (ret == 0) { afs_vnode_finalise_status_update(vnode, server); afs_put_server(server); } else { afs_vnode_status_update_failed(vnode, ret); } _leave(" = %d", ret); return ret; no_server: spin_lock(&vnode->lock); vnode->update_cnt--; ASSERTCMP(vnode->update_cnt, >=, 0); spin_unlock(&vnode->lock); return PTR_ERR(server); } /* * get the status of a volume */ int afs_vnode_get_volume_status(struct afs_vnode *vnode, struct key *key, struct afs_volume_status *vs) { struct afs_server *server; int ret; _enter("%s{%x:%u.%u},%x,", vnode->volume->vlocation->vldb.name, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique, key_serial(key)); do { /* pick a server to query */ server = afs_volume_pick_fileserver(vnode); if (IS_ERR(server)) goto no_server; _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); ret = afs_fs_get_volume_status(server, key, vnode, vs, &afs_sync_call); } while (!afs_volume_release_fileserver(vnode, server, ret)); /* adjust the flags */ if (ret == 0) afs_put_server(server); _leave(" = %d", ret); return ret; no_server: return PTR_ERR(server); } /* * get a lock on a file */ int afs_vnode_set_lock(struct afs_vnode *vnode, struct key *key, afs_lock_type_t type) { struct afs_server *server; int ret; _enter("%s{%x:%u.%u},%x,%u", vnode->volume->vlocation->vldb.name, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique, key_serial(key), type); do { /* pick a server to query */ server = afs_volume_pick_fileserver(vnode); if (IS_ERR(server)) goto no_server; _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); ret = afs_fs_set_lock(server, key, vnode, type, &afs_sync_call); } while (!afs_volume_release_fileserver(vnode, server, ret)); /* adjust the flags */ if (ret == 0) afs_put_server(server); _leave(" = %d", ret); return ret; no_server: return PTR_ERR(server); } /* * extend a lock on a file */ int afs_vnode_extend_lock(struct afs_vnode *vnode, struct key *key) { struct afs_server *server; int ret; _enter("%s{%x:%u.%u},%x", vnode->volume->vlocation->vldb.name, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique, key_serial(key)); do { /* pick a server to query */ server = afs_volume_pick_fileserver(vnode); if (IS_ERR(server)) goto no_server; _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); ret = afs_fs_extend_lock(server, key, vnode, &afs_sync_call); } while (!afs_volume_release_fileserver(vnode, server, ret)); /* adjust the flags */ if (ret == 0) afs_put_server(server); _leave(" = %d", ret); return ret; no_server: return PTR_ERR(server); } /* * release a lock on a file */ int afs_vnode_release_lock(struct afs_vnode *vnode, struct key *key) { struct afs_server *server; int ret; _enter("%s{%x:%u.%u},%x", vnode->volume->vlocation->vldb.name, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique, key_serial(key)); do { /* pick a server to query */ server = afs_volume_pick_fileserver(vnode); if (IS_ERR(server)) goto no_server; _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); ret = afs_fs_release_lock(server, key, vnode, &afs_sync_call); } while (!afs_volume_release_fileserver(vnode, server, ret)); /* adjust the flags */ if (ret == 0) afs_put_server(server); _leave(" = %d", ret); return ret; no_server: return PTR_ERR(server); }