diff options
Diffstat (limited to 'fs/afs/vnode.c')
| -rw-r--r-- | fs/afs/vnode.c | 1025 |
1 files changed, 1025 insertions, 0 deletions
diff --git a/fs/afs/vnode.c b/fs/afs/vnode.c new file mode 100644 index 000000000..25cf4c3f4 --- /dev/null +++ b/fs/afs/vnode.c @@ -0,0 +1,1025 @@ +/* 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 <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/fs.h> +#include <linux/sched.h> +#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 callback promise + */ +static void afs_vnode_deleted_remotely(struct afs_vnode *vnode) +{ + struct afs_server *server; + + _enter("{%p}", vnode->server); + + set_bit(AFS_VNODE_DELETED, &vnode->flags); + + server = vnode->server; + if (server) { + if (vnode->cb_promised) { + spin_lock(&server->cb_lock); + if (vnode->cb_promised) { + rb_erase(&vnode->cb_promise, + &server->cb_promises); + vnode->cb_promised = false; + } + spin_unlock(&server->cb_lock); + } + + spin_lock(&server->fs_lock); + rb_erase(&vnode->server_rb, &server->fs_vnodes); + spin_unlock(&server->fs_lock); + + vnode->server = NULL; + afs_put_server(server); + } else { + ASSERT(!vnode->cb_promised); + } + + _leave(""); +} + +/* + * finish off updating the recorded status of a file after a successful + * operation completion + * - starts callback expiry timer + * - adds to server's callback list + */ +void afs_vnode_finalise_status_update(struct afs_vnode *vnode, + struct afs_server *server) +{ + struct afs_server *oldserver = NULL; + + _enter("%p,%p", vnode, server); + + spin_lock(&vnode->lock); + clear_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); + afs_vnode_note_promise(vnode, server); + vnode->update_cnt--; + ASSERTCMP(vnode->update_cnt, >=, 0); + spin_unlock(&vnode->lock); + + wake_up_all(&vnode->update_waitq); + afs_put_server(oldserver); + _leave(""); +} + +/* + * finish off updating the recorded status of a file after an operation failed + */ +static void afs_vnode_status_update_failed(struct afs_vnode *vnode, int ret) +{ + _enter("{%x:%u},%d", vnode->fid.vid, vnode->fid.vnode, ret); + + spin_lock(&vnode->lock); + + clear_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); + + if (ret == -ENOENT) { + /* the file was deleted on the server */ + _debug("got NOENT from server - marking file deleted"); + afs_vnode_deleted_remotely(vnode); + } + + vnode->update_cnt--; + ASSERTCMP(vnode->update_cnt, >=, 0); + spin_unlock(&vnode->lock); + + wake_up_all(&vnode->update_waitq); + _leave(""); +} + +/* + * fetch file status from the volume + * - don't issue a fetch if: + * - the changed bit is not set and there's a valid callback + * - there are any outstanding ops that will fetch the status + * - TODO implement local caching + */ +int afs_vnode_fetch_status(struct afs_vnode *vnode, + struct afs_vnode *auth_vnode, struct key *key) +{ + struct afs_server *server; + unsigned long acl_order; + int ret; + + DECLARE_WAITQUEUE(myself, current); + + _enter("%s,{%x:%u.%u}", + vnode->volume->vlocation->vldb.name, + vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique); + + if (!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) && + vnode->cb_promised) { + _leave(" [unchanged]"); + return 0; + } + + if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { + _leave(" [deleted]"); + return -ENOENT; + } + + acl_order = 0; + if (auth_vnode) + acl_order = auth_vnode->acl_order; + + spin_lock(&vnode->lock); + + if (!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) && + vnode->cb_promised) { + spin_unlock(&vnode->lock); + _leave(" [unchanged]"); + return 0; + } + + ASSERTCMP(vnode->update_cnt, >=, 0); + + if (vnode->update_cnt > 0) { + /* someone else started a fetch */ + _debug("wait on fetch %d", vnode->update_cnt); + + set_current_state(TASK_UNINTERRUPTIBLE); + ASSERT(myself.func != NULL); + add_wait_queue(&vnode->update_waitq, &myself); + + /* wait for the status to be updated */ + for (;;) { + if (!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) + break; + if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) + break; + + /* check to see if it got updated and invalidated all + * before we saw it */ + if (vnode->update_cnt == 0) { + remove_wait_queue(&vnode->update_waitq, + &myself); + set_current_state(TASK_RUNNING); + goto get_anyway; + } + + spin_unlock(&vnode->lock); + + schedule(); + set_current_state(TASK_UNINTERRUPTIBLE); + + spin_lock(&vnode->lock); + } + + remove_wait_queue(&vnode->update_waitq, &myself); + spin_unlock(&vnode->lock); + set_current_state(TASK_RUNNING); + + return test_bit(AFS_VNODE_DELETED, &vnode->flags) ? + -ENOENT : 0; + } + +get_anyway: + /* okay... we're going to have to initiate the op */ + vnode->update_cnt++; + + spin_unlock(&vnode->lock); + + /* merge AFS status fetches and clear outstanding callback on this + * vnode */ + do { + /* pick a server to query */ + server = afs_volume_pick_fileserver(vnode); + if (IS_ERR(server)) + goto no_server; + + _debug("USING SERVER: %p{%08x}", + server, ntohl(server->addr.s_addr)); + + ret = afs_fs_fetch_file_status(server, key, vnode, NULL, + &afs_sync_call); + + } while (!afs_volume_release_fileserver(vnode, server, ret)); + + /* adjust the flags */ + if (ret == 0) { + _debug("adjust"); + if (auth_vnode) + afs_cache_permit(vnode, key, acl_order); + afs_vnode_finalise_status_update(vnode, server); + afs_put_server(server); + } else { + _debug("failed [%d]", ret); + afs_vnode_status_update_failed(vnode, ret); + } + + ASSERTCMP(vnode->update_cnt, >=, 0); + + _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); +} + +/* + * fetch file data from the volume + * - TODO implement caching + */ +int afs_vnode_fetch_data(struct afs_vnode *vnode, struct key *key, + off_t offset, size_t length, struct page *page) +{ + 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); + + /* merge in AFS status fetches and clear outstanding callback on this + * vnode */ + 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_fetch_data(server, key, vnode, offset, length, + page, &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); +} + +/* + * make a file or a directory + */ +int afs_vnode_create(struct afs_vnode *vnode, struct key *key, + const char *name, umode_t mode, struct afs_fid *newfid, + struct afs_file_status *newstatus, + struct afs_callback *newcb, struct afs_server **_server) +{ + struct afs_server *server; + int ret; + + _enter("%s{%x:%u.%u},%x,%s,,", + vnode->volume->vlocation->vldb.name, + vnode->fid.vid, + vnode->fid.vnode, + vnode->fid.unique, + key_serial(key), + name); + + /* 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_create(server, key, vnode, name, mode, newfid, + newstatus, newcb, &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); +} + +/* + * remove a file or directory + */ +int afs_vnode_remove(struct afs_vnode *vnode, struct key *key, const char *name, + bool isdir) +{ + struct afs_server *server; + int ret; + + _enter("%s{%x:%u.%u},%x,%s", + vnode->volume->vlocation->vldb.name, + vnode->fid.vid, + vnode->fid.vnode, + vnode->fid.unique, + key_serial(key), + name); + + /* this op will fetch the status on the directory we're removing from */ + 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_remove(server, key, vnode, name, isdir, + &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 [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); +} + +/* + * create a hard link + */ +int afs_vnode_link(struct afs_vnode *dvnode, struct afs_vnode *vnode, + struct key *key, const char *name) +{ + struct afs_server *server; + int ret; + + _enter("%s{%x:%u.%u},%s{%x:%u.%u},%x,%s", + dvnode->volume->vlocation->vldb.name, + dvnode->fid.vid, + dvnode->fid.vnode, + dvnode->fid.unique, + vnode->volume->vlocation->vldb.name, + vnode->fid.vid, + vnode->fid.vnode, + vnode->fid.unique, + key_serial(key), + name); + + /* this op will fetch the status on the directory we're removing from */ + spin_lock(&vnode->lock); + vnode->update_cnt++; + spin_unlock(&vnode->lock); + spin_lock(&dvnode->lock); + dvnode->update_cnt++; + spin_unlock(&dvnode->lock); + + do { + /* pick a server to query */ + server = afs_volume_pick_fileserver(dvnode); + if (IS_ERR(server)) + goto no_server; + + _debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr)); + + ret = afs_fs_link(server, key, dvnode, vnode, name, + &afs_sync_call); + + } while (!afs_volume_release_fileserver(dvnode, server, ret)); + + /* adjust the flags */ + if (ret == 0) { + afs_vnode_finalise_status_update(vnode, server); + afs_vnode_finalise_status_update(dvnode, server); + afs_put_server(server); + } else { + afs_vnode_status_update_failed(vnode, ret); + afs_vnode_status_update_failed(dvnode, ret); + } + + _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); + spin_lock(&dvnode->lock); + dvnode->update_cnt--; + ASSERTCMP(dvnode->update_cnt, >=, 0); + spin_unlock(&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); +} |