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500086300e
Ocfs2 currently does cluster-wide node messaging to check the open state of an inode during delete. This patch removes that mechanism in favor of an inode cluster lock which is taken at shared read when an inode is first read and dropped in clear_inode(). This allows a deleting node to test the liveness of an inode by attempting to take an exclusive lock. Signed-off-by: Tiger Yang <tiger.yang@oracle.com> Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* ocfs2_lockid.h
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*
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* Defines OCFS2 lockid bits.
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*
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* Copyright (C) 2002, 2005 Oracle. All rights reserved.
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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
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef OCFS2_LOCKID_H
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#define OCFS2_LOCKID_H
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/* lock ids are made up in the following manner:
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* name[0] --> type
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* name[1-6] --> 6 pad characters, reserved for now
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* name[7-22] --> block number, expressed in hex as 16 chars
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* name[23-30] --> i_generation, expressed in hex 8 chars
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* name[31] --> '\0' */
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#define OCFS2_LOCK_ID_MAX_LEN 32
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#define OCFS2_LOCK_ID_PAD "000000"
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#define OCFS2_DENTRY_LOCK_INO_START 18
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enum ocfs2_lock_type {
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OCFS2_LOCK_TYPE_META = 0,
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OCFS2_LOCK_TYPE_DATA,
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OCFS2_LOCK_TYPE_SUPER,
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OCFS2_LOCK_TYPE_RENAME,
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OCFS2_LOCK_TYPE_RW,
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OCFS2_LOCK_TYPE_DENTRY,
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OCFS2_LOCK_TYPE_OPEN,
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OCFS2_NUM_LOCK_TYPES
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};
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static inline char ocfs2_lock_type_char(enum ocfs2_lock_type type)
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{
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char c;
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switch (type) {
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case OCFS2_LOCK_TYPE_META:
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c = 'M';
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break;
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case OCFS2_LOCK_TYPE_DATA:
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c = 'D';
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break;
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case OCFS2_LOCK_TYPE_SUPER:
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c = 'S';
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break;
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case OCFS2_LOCK_TYPE_RENAME:
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c = 'R';
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break;
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case OCFS2_LOCK_TYPE_RW:
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c = 'W';
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break;
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case OCFS2_LOCK_TYPE_DENTRY:
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c = 'N';
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break;
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case OCFS2_LOCK_TYPE_OPEN:
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c = 'O';
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break;
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default:
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c = '\0';
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}
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return c;
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}
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static char *ocfs2_lock_type_strings[] = {
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[OCFS2_LOCK_TYPE_META] = "Meta",
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[OCFS2_LOCK_TYPE_DATA] = "Data",
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[OCFS2_LOCK_TYPE_SUPER] = "Super",
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[OCFS2_LOCK_TYPE_RENAME] = "Rename",
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/* Need to differntiate from [R]ename.. serializing writes is the
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* important job it does, anyway. */
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[OCFS2_LOCK_TYPE_RW] = "Write/Read",
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[OCFS2_LOCK_TYPE_DENTRY] = "Dentry",
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[OCFS2_LOCK_TYPE_OPEN] = "Open",
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};
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static inline const char *ocfs2_lock_type_string(enum ocfs2_lock_type type)
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{
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#ifdef __KERNEL__
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mlog_bug_on_msg(type >= OCFS2_NUM_LOCK_TYPES, "%d\n", type);
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#endif
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return ocfs2_lock_type_strings[type];
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}
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#endif /* OCFS2_LOCKID_H */
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