From 34a9dd7e29e9129fec40c645a03f1bbbe810e771 Mon Sep 17 00:00:00 2001 From: Joel Becker Date: Thu, 28 Jan 2010 15:00:49 -0800 Subject: ocfs2_dlmfs: Move to its own directory We're going to remove the tie between ocfs2_dlmfs and o2dlm. ocfs2_dlmfs doesn't belong in the fs/ocfs2/dlm directory anymore. Here we move it to fs/ocfs2/dlmfs. Signed-off-by: Joel Becker --- fs/ocfs2/dlm/userdlm.c | 676 ------------------------------------------------- 1 file changed, 676 deletions(-) delete mode 100644 fs/ocfs2/dlm/userdlm.c (limited to 'fs/ocfs2/dlm/userdlm.c') diff --git a/fs/ocfs2/dlm/userdlm.c b/fs/ocfs2/dlm/userdlm.c deleted file mode 100644 index 4cb1d3dae250..000000000000 --- a/fs/ocfs2/dlm/userdlm.c +++ /dev/null @@ -1,676 +0,0 @@ -/* -*- mode: c; c-basic-offset: 8; -*- - * vim: noexpandtab sw=8 ts=8 sts=0: - * - * userdlm.c - * - * Code which implements the kernel side of a minimal userspace - * interface to our DLM. - * - * Many of the functions here are pared down versions of dlmglue.c - * functions. - * - * Copyright (C) 2003, 2004 Oracle. All rights reserved. - * - * 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. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * 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., 59 Temple Place - Suite 330, - * Boston, MA 021110-1307, USA. - */ - -#include - -#include -#include -#include -#include - - -#include "cluster/nodemanager.h" -#include "cluster/heartbeat.h" -#include "cluster/tcp.h" - -#include "dlmapi.h" - -#include "userdlm.h" - -#define MLOG_MASK_PREFIX ML_DLMFS -#include "cluster/masklog.h" - -static inline int user_check_wait_flag(struct user_lock_res *lockres, - int flag) -{ - int ret; - - spin_lock(&lockres->l_lock); - ret = lockres->l_flags & flag; - spin_unlock(&lockres->l_lock); - - return ret; -} - -static inline void user_wait_on_busy_lock(struct user_lock_res *lockres) - -{ - wait_event(lockres->l_event, - !user_check_wait_flag(lockres, USER_LOCK_BUSY)); -} - -static inline void user_wait_on_blocked_lock(struct user_lock_res *lockres) - -{ - wait_event(lockres->l_event, - !user_check_wait_flag(lockres, USER_LOCK_BLOCKED)); -} - -/* I heart container_of... */ -static inline struct dlm_ctxt * -dlm_ctxt_from_user_lockres(struct user_lock_res *lockres) -{ - struct dlmfs_inode_private *ip; - - ip = container_of(lockres, - struct dlmfs_inode_private, - ip_lockres); - return ip->ip_dlm; -} - -static struct inode * -user_dlm_inode_from_user_lockres(struct user_lock_res *lockres) -{ - struct dlmfs_inode_private *ip; - - ip = container_of(lockres, - struct dlmfs_inode_private, - ip_lockres); - return &ip->ip_vfs_inode; -} - -static inline void user_recover_from_dlm_error(struct user_lock_res *lockres) -{ - spin_lock(&lockres->l_lock); - lockres->l_flags &= ~USER_LOCK_BUSY; - spin_unlock(&lockres->l_lock); -} - -#define user_log_dlm_error(_func, _stat, _lockres) do { \ - mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \ - "resource %.*s: %s\n", dlm_errname(_stat), _func, \ - _lockres->l_namelen, _lockres->l_name, dlm_errmsg(_stat)); \ -} while (0) - -/* WARNING: This function lives in a world where the only three lock - * levels are EX, PR, and NL. It *will* have to be adjusted when more - * lock types are added. */ -static inline int user_highest_compat_lock_level(int level) -{ - int new_level = LKM_EXMODE; - - if (level == LKM_EXMODE) - new_level = LKM_NLMODE; - else if (level == LKM_PRMODE) - new_level = LKM_PRMODE; - return new_level; -} - -static void user_ast(void *opaque) -{ - struct user_lock_res *lockres = opaque; - struct dlm_lockstatus *lksb; - - mlog(0, "AST fired for lockres %.*s\n", lockres->l_namelen, - lockres->l_name); - - spin_lock(&lockres->l_lock); - - lksb = &(lockres->l_lksb); - if (lksb->status != DLM_NORMAL) { - mlog(ML_ERROR, "lksb status value of %u on lockres %.*s\n", - lksb->status, lockres->l_namelen, lockres->l_name); - spin_unlock(&lockres->l_lock); - return; - } - - mlog_bug_on_msg(lockres->l_requested == LKM_IVMODE, - "Lockres %.*s, requested ivmode. flags 0x%x\n", - lockres->l_namelen, lockres->l_name, lockres->l_flags); - - /* we're downconverting. */ - if (lockres->l_requested < lockres->l_level) { - if (lockres->l_requested <= - user_highest_compat_lock_level(lockres->l_blocking)) { - lockres->l_blocking = LKM_NLMODE; - lockres->l_flags &= ~USER_LOCK_BLOCKED; - } - } - - lockres->l_level = lockres->l_requested; - lockres->l_requested = LKM_IVMODE; - lockres->l_flags |= USER_LOCK_ATTACHED; - lockres->l_flags &= ~USER_LOCK_BUSY; - - spin_unlock(&lockres->l_lock); - - wake_up(&lockres->l_event); -} - -static inline void user_dlm_grab_inode_ref(struct user_lock_res *lockres) -{ - struct inode *inode; - inode = user_dlm_inode_from_user_lockres(lockres); - if (!igrab(inode)) - BUG(); -} - -static void user_dlm_unblock_lock(struct work_struct *work); - -static void __user_dlm_queue_lockres(struct user_lock_res *lockres) -{ - if (!(lockres->l_flags & USER_LOCK_QUEUED)) { - user_dlm_grab_inode_ref(lockres); - - INIT_WORK(&lockres->l_work, user_dlm_unblock_lock); - - queue_work(user_dlm_worker, &lockres->l_work); - lockres->l_flags |= USER_LOCK_QUEUED; - } -} - -static void __user_dlm_cond_queue_lockres(struct user_lock_res *lockres) -{ - int queue = 0; - - if (!(lockres->l_flags & USER_LOCK_BLOCKED)) - return; - - switch (lockres->l_blocking) { - case LKM_EXMODE: - if (!lockres->l_ex_holders && !lockres->l_ro_holders) - queue = 1; - break; - case LKM_PRMODE: - if (!lockres->l_ex_holders) - queue = 1; - break; - default: - BUG(); - } - - if (queue) - __user_dlm_queue_lockres(lockres); -} - -static void user_bast(void *opaque, int level) -{ - struct user_lock_res *lockres = opaque; - - mlog(0, "Blocking AST fired for lockres %.*s. Blocking level %d\n", - lockres->l_namelen, lockres->l_name, level); - - spin_lock(&lockres->l_lock); - lockres->l_flags |= USER_LOCK_BLOCKED; - if (level > lockres->l_blocking) - lockres->l_blocking = level; - - __user_dlm_queue_lockres(lockres); - spin_unlock(&lockres->l_lock); - - wake_up(&lockres->l_event); -} - -static void user_unlock_ast(void *opaque, enum dlm_status status) -{ - struct user_lock_res *lockres = opaque; - - mlog(0, "UNLOCK AST called on lock %.*s\n", lockres->l_namelen, - lockres->l_name); - - if (status != DLM_NORMAL && status != DLM_CANCELGRANT) - mlog(ML_ERROR, "Dlm returns status %d\n", status); - - spin_lock(&lockres->l_lock); - /* The teardown flag gets set early during the unlock process, - * so test the cancel flag to make sure that this ast isn't - * for a concurrent cancel. */ - if (lockres->l_flags & USER_LOCK_IN_TEARDOWN - && !(lockres->l_flags & USER_LOCK_IN_CANCEL)) { - lockres->l_level = LKM_IVMODE; - } else if (status == DLM_CANCELGRANT) { - /* We tried to cancel a convert request, but it was - * already granted. Don't clear the busy flag - the - * ast should've done this already. */ - BUG_ON(!(lockres->l_flags & USER_LOCK_IN_CANCEL)); - lockres->l_flags &= ~USER_LOCK_IN_CANCEL; - goto out_noclear; - } else { - BUG_ON(!(lockres->l_flags & USER_LOCK_IN_CANCEL)); - /* Cancel succeeded, we want to re-queue */ - lockres->l_requested = LKM_IVMODE; /* cancel an - * upconvert - * request. */ - lockres->l_flags &= ~USER_LOCK_IN_CANCEL; - /* we want the unblock thread to look at it again - * now. */ - if (lockres->l_flags & USER_LOCK_BLOCKED) - __user_dlm_queue_lockres(lockres); - } - - lockres->l_flags &= ~USER_LOCK_BUSY; -out_noclear: - spin_unlock(&lockres->l_lock); - - wake_up(&lockres->l_event); -} - -static inline void user_dlm_drop_inode_ref(struct user_lock_res *lockres) -{ - struct inode *inode; - inode = user_dlm_inode_from_user_lockres(lockres); - iput(inode); -} - -static void user_dlm_unblock_lock(struct work_struct *work) -{ - int new_level, status; - struct user_lock_res *lockres = - container_of(work, struct user_lock_res, l_work); - struct dlm_ctxt *dlm = dlm_ctxt_from_user_lockres(lockres); - - mlog(0, "processing lockres %.*s\n", lockres->l_namelen, - lockres->l_name); - - spin_lock(&lockres->l_lock); - - mlog_bug_on_msg(!(lockres->l_flags & USER_LOCK_QUEUED), - "Lockres %.*s, flags 0x%x\n", - lockres->l_namelen, lockres->l_name, lockres->l_flags); - - /* notice that we don't clear USER_LOCK_BLOCKED here. If it's - * set, we want user_ast clear it. */ - lockres->l_flags &= ~USER_LOCK_QUEUED; - - /* It's valid to get here and no longer be blocked - if we get - * several basts in a row, we might be queued by the first - * one, the unblock thread might run and clear the queued - * flag, and finally we might get another bast which re-queues - * us before our ast for the downconvert is called. */ - if (!(lockres->l_flags & USER_LOCK_BLOCKED)) { - spin_unlock(&lockres->l_lock); - goto drop_ref; - } - - if (lockres->l_flags & USER_LOCK_IN_TEARDOWN) { - spin_unlock(&lockres->l_lock); - goto drop_ref; - } - - if (lockres->l_flags & USER_LOCK_BUSY) { - if (lockres->l_flags & USER_LOCK_IN_CANCEL) { - spin_unlock(&lockres->l_lock); - goto drop_ref; - } - - lockres->l_flags |= USER_LOCK_IN_CANCEL; - spin_unlock(&lockres->l_lock); - - status = dlmunlock(dlm, - &lockres->l_lksb, - LKM_CANCEL, - user_unlock_ast, - lockres); - if (status != DLM_NORMAL) - user_log_dlm_error("dlmunlock", status, lockres); - goto drop_ref; - } - - /* If there are still incompat holders, we can exit safely - * without worrying about re-queueing this lock as that will - * happen on the last call to user_cluster_unlock. */ - if ((lockres->l_blocking == LKM_EXMODE) - && (lockres->l_ex_holders || lockres->l_ro_holders)) { - spin_unlock(&lockres->l_lock); - mlog(0, "can't downconvert for ex: ro = %u, ex = %u\n", - lockres->l_ro_holders, lockres->l_ex_holders); - goto drop_ref; - } - - if ((lockres->l_blocking == LKM_PRMODE) - && lockres->l_ex_holders) { - spin_unlock(&lockres->l_lock); - mlog(0, "can't downconvert for pr: ex = %u\n", - lockres->l_ex_holders); - goto drop_ref; - } - - /* yay, we can downconvert now. */ - new_level = user_highest_compat_lock_level(lockres->l_blocking); - lockres->l_requested = new_level; - lockres->l_flags |= USER_LOCK_BUSY; - mlog(0, "Downconvert lock from %d to %d\n", - lockres->l_level, new_level); - spin_unlock(&lockres->l_lock); - - /* need lock downconvert request now... */ - status = dlmlock(dlm, - new_level, - &lockres->l_lksb, - LKM_CONVERT|LKM_VALBLK, - lockres->l_name, - lockres->l_namelen, - user_ast, - lockres, - user_bast); - if (status != DLM_NORMAL) { - user_log_dlm_error("dlmlock", status, lockres); - user_recover_from_dlm_error(lockres); - } - -drop_ref: - user_dlm_drop_inode_ref(lockres); -} - -static inline void user_dlm_inc_holders(struct user_lock_res *lockres, - int level) -{ - switch(level) { - case LKM_EXMODE: - lockres->l_ex_holders++; - break; - case LKM_PRMODE: - lockres->l_ro_holders++; - break; - default: - BUG(); - } -} - -/* predict what lock level we'll be dropping down to on behalf - * of another node, and return true if the currently wanted - * level will be compatible with it. */ -static inline int -user_may_continue_on_blocked_lock(struct user_lock_res *lockres, - int wanted) -{ - BUG_ON(!(lockres->l_flags & USER_LOCK_BLOCKED)); - - return wanted <= user_highest_compat_lock_level(lockres->l_blocking); -} - -int user_dlm_cluster_lock(struct user_lock_res *lockres, - int level, - int lkm_flags) -{ - int status, local_flags; - struct dlm_ctxt *dlm = dlm_ctxt_from_user_lockres(lockres); - - if (level != LKM_EXMODE && - level != LKM_PRMODE) { - mlog(ML_ERROR, "lockres %.*s: invalid request!\n", - lockres->l_namelen, lockres->l_name); - status = -EINVAL; - goto bail; - } - - mlog(0, "lockres %.*s: asking for %s lock, passed flags = 0x%x\n", - lockres->l_namelen, lockres->l_name, - (level == LKM_EXMODE) ? "LKM_EXMODE" : "LKM_PRMODE", - lkm_flags); - -again: - if (signal_pending(current)) { - status = -ERESTARTSYS; - goto bail; - } - - spin_lock(&lockres->l_lock); - - /* We only compare against the currently granted level - * here. If the lock is blocked waiting on a downconvert, - * we'll get caught below. */ - if ((lockres->l_flags & USER_LOCK_BUSY) && - (level > lockres->l_level)) { - /* is someone sitting in dlm_lock? If so, wait on - * them. */ - spin_unlock(&lockres->l_lock); - - user_wait_on_busy_lock(lockres); - goto again; - } - - if ((lockres->l_flags & USER_LOCK_BLOCKED) && - (!user_may_continue_on_blocked_lock(lockres, level))) { - /* is the lock is currently blocked on behalf of - * another node */ - spin_unlock(&lockres->l_lock); - - user_wait_on_blocked_lock(lockres); - goto again; - } - - if (level > lockres->l_level) { - local_flags = lkm_flags | LKM_VALBLK; - if (lockres->l_level != LKM_IVMODE) - local_flags |= LKM_CONVERT; - - lockres->l_requested = level; - lockres->l_flags |= USER_LOCK_BUSY; - spin_unlock(&lockres->l_lock); - - BUG_ON(level == LKM_IVMODE); - BUG_ON(level == LKM_NLMODE); - - /* call dlm_lock to upgrade lock now */ - status = dlmlock(dlm, - level, - &lockres->l_lksb, - local_flags, - lockres->l_name, - lockres->l_namelen, - user_ast, - lockres, - user_bast); - if (status != DLM_NORMAL) { - if ((lkm_flags & LKM_NOQUEUE) && - (status == DLM_NOTQUEUED)) - status = -EAGAIN; - else { - user_log_dlm_error("dlmlock", status, lockres); - status = -EINVAL; - } - user_recover_from_dlm_error(lockres); - goto bail; - } - - user_wait_on_busy_lock(lockres); - goto again; - } - - user_dlm_inc_holders(lockres, level); - spin_unlock(&lockres->l_lock); - - status = 0; -bail: - return status; -} - -static inline void user_dlm_dec_holders(struct user_lock_res *lockres, - int level) -{ - switch(level) { - case LKM_EXMODE: - BUG_ON(!lockres->l_ex_holders); - lockres->l_ex_holders--; - break; - case LKM_PRMODE: - BUG_ON(!lockres->l_ro_holders); - lockres->l_ro_holders--; - break; - default: - BUG(); - } -} - -void user_dlm_cluster_unlock(struct user_lock_res *lockres, - int level) -{ - if (level != LKM_EXMODE && - level != LKM_PRMODE) { - mlog(ML_ERROR, "lockres %.*s: invalid request!\n", - lockres->l_namelen, lockres->l_name); - return; - } - - spin_lock(&lockres->l_lock); - user_dlm_dec_holders(lockres, level); - __user_dlm_cond_queue_lockres(lockres); - spin_unlock(&lockres->l_lock); -} - -void user_dlm_write_lvb(struct inode *inode, - const char *val, - unsigned int len) -{ - struct user_lock_res *lockres = &DLMFS_I(inode)->ip_lockres; - char *lvb = lockres->l_lksb.lvb; - - BUG_ON(len > DLM_LVB_LEN); - - spin_lock(&lockres->l_lock); - - BUG_ON(lockres->l_level < LKM_EXMODE); - memcpy(lvb, val, len); - - spin_unlock(&lockres->l_lock); -} - -void user_dlm_read_lvb(struct inode *inode, - char *val, - unsigned int len) -{ - struct user_lock_res *lockres = &DLMFS_I(inode)->ip_lockres; - char *lvb = lockres->l_lksb.lvb; - - BUG_ON(len > DLM_LVB_LEN); - - spin_lock(&lockres->l_lock); - - BUG_ON(lockres->l_level < LKM_PRMODE); - memcpy(val, lvb, len); - - spin_unlock(&lockres->l_lock); -} - -void user_dlm_lock_res_init(struct user_lock_res *lockres, - struct dentry *dentry) -{ - memset(lockres, 0, sizeof(*lockres)); - - spin_lock_init(&lockres->l_lock); - init_waitqueue_head(&lockres->l_event); - lockres->l_level = LKM_IVMODE; - lockres->l_requested = LKM_IVMODE; - lockres->l_blocking = LKM_IVMODE; - - /* should have been checked before getting here. */ - BUG_ON(dentry->d_name.len >= USER_DLM_LOCK_ID_MAX_LEN); - - memcpy(lockres->l_name, - dentry->d_name.name, - dentry->d_name.len); - lockres->l_namelen = dentry->d_name.len; -} - -int user_dlm_destroy_lock(struct user_lock_res *lockres) -{ - int status = -EBUSY; - struct dlm_ctxt *dlm = dlm_ctxt_from_user_lockres(lockres); - - mlog(0, "asked to destroy %.*s\n", lockres->l_namelen, lockres->l_name); - - spin_lock(&lockres->l_lock); - if (lockres->l_flags & USER_LOCK_IN_TEARDOWN) { - spin_unlock(&lockres->l_lock); - return 0; - } - - lockres->l_flags |= USER_LOCK_IN_TEARDOWN; - - while (lockres->l_flags & USER_LOCK_BUSY) { - spin_unlock(&lockres->l_lock); - - user_wait_on_busy_lock(lockres); - - spin_lock(&lockres->l_lock); - } - - if (lockres->l_ro_holders || lockres->l_ex_holders) { - spin_unlock(&lockres->l_lock); - goto bail; - } - - status = 0; - if (!(lockres->l_flags & USER_LOCK_ATTACHED)) { - spin_unlock(&lockres->l_lock); - goto bail; - } - - lockres->l_flags &= ~USER_LOCK_ATTACHED; - lockres->l_flags |= USER_LOCK_BUSY; - spin_unlock(&lockres->l_lock); - - status = dlmunlock(dlm, - &lockres->l_lksb, - LKM_VALBLK, - user_unlock_ast, - lockres); - if (status != DLM_NORMAL) { - user_log_dlm_error("dlmunlock", status, lockres); - status = -EINVAL; - goto bail; - } - - user_wait_on_busy_lock(lockres); - - status = 0; -bail: - return status; -} - -struct dlm_ctxt *user_dlm_register_context(struct qstr *name, - struct dlm_protocol_version *proto) -{ - struct dlm_ctxt *dlm; - u32 dlm_key; - char *domain; - - domain = kmalloc(name->len + 1, GFP_NOFS); - if (!domain) { - mlog_errno(-ENOMEM); - return ERR_PTR(-ENOMEM); - } - - dlm_key = crc32_le(0, name->name, name->len); - - snprintf(domain, name->len + 1, "%.*s", name->len, name->name); - - dlm = dlm_register_domain(domain, dlm_key, proto); - if (IS_ERR(dlm)) - mlog_errno(PTR_ERR(dlm)); - - kfree(domain); - return dlm; -} - -void user_dlm_unregister_context(struct dlm_ctxt *dlm) -{ - dlm_unregister_domain(dlm); -} -- cgit v1.2.1