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8dec98edfe
refcount tree lock resource is used to protect refcount tree read/write among multiple nodes. Signed-off-by: Tao Ma <tao.ma@oracle.com>
129 lines
3.2 KiB
C
129 lines
3.2 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_LOCK_TYPE_FLOCK,
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OCFS2_LOCK_TYPE_QINFO,
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OCFS2_LOCK_TYPE_NFS_SYNC,
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OCFS2_LOCK_TYPE_ORPHAN_SCAN,
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OCFS2_LOCK_TYPE_REFCOUNT,
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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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case OCFS2_LOCK_TYPE_FLOCK:
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c = 'F';
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break;
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case OCFS2_LOCK_TYPE_QINFO:
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c = 'Q';
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break;
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case OCFS2_LOCK_TYPE_NFS_SYNC:
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c = 'Y';
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break;
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case OCFS2_LOCK_TYPE_ORPHAN_SCAN:
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c = 'P';
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break;
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case OCFS2_LOCK_TYPE_REFCOUNT:
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c = 'T';
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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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[OCFS2_LOCK_TYPE_FLOCK] = "Flock",
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[OCFS2_LOCK_TYPE_QINFO] = "Quota",
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[OCFS2_LOCK_TYPE_NFS_SYNC] = "NFSSync",
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[OCFS2_LOCK_TYPE_ORPHAN_SCAN] = "OrphanScan",
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[OCFS2_LOCK_TYPE_REFCOUNT] = "Refcount",
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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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BUG_ON(type >= OCFS2_NUM_LOCK_TYPES);
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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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