fs/ocfs2/ocfs2_lockid.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /* -*- mode: c; c-basic-offset: 8; -*-
   3  * vim: noexpandtab sw=8 ts=8 sts=0:
   4  *
   5  * ocfs2_lockid.h
   6  *
   7  * Defines OCFS2 lockid bits.
   8  *
   9  * Copyright (C) 2002, 2005 Oracle.  All rights reserved.
  10  */
  11
  12 #ifndef OCFS2_LOCKID_H
  13 #define OCFS2_LOCKID_H
  14
  15 /* lock ids are made up in the following manner:
  16  * name[0]     --> type
  17  * name[1-6]   --> 6 pad characters, reserved for now
  18  * name[7-22]  --> block number, expressed in hex as 16 chars
  19  * name[23-30] --> i_generation, expressed in hex 8 chars
  20  * name[31]    --> '\0' */
  21 #define OCFS2_LOCK_ID_MAX_LEN  32
  22 #define OCFS2_LOCK_ID_PAD "000000"
  23
  24 #define OCFS2_DENTRY_LOCK_INO_START 18
  25
  26 enum ocfs2_lock_type {
  27         OCFS2_LOCK_TYPE_META = 0,
  28         OCFS2_LOCK_TYPE_DATA,
  29         OCFS2_LOCK_TYPE_SUPER,
  30         OCFS2_LOCK_TYPE_RENAME,
  31         OCFS2_LOCK_TYPE_RW,
  32         OCFS2_LOCK_TYPE_DENTRY,
  33         OCFS2_LOCK_TYPE_OPEN,
  34         OCFS2_LOCK_TYPE_FLOCK,
  35         OCFS2_LOCK_TYPE_QINFO,
  36         OCFS2_LOCK_TYPE_NFS_SYNC,
  37         OCFS2_LOCK_TYPE_ORPHAN_SCAN,
  38         OCFS2_LOCK_TYPE_REFCOUNT,
  39         OCFS2_LOCK_TYPE_TRIM_FS,
  40         OCFS2_NUM_LOCK_TYPES
  41 };
  42
  43 static inline char ocfs2_lock_type_char(enum ocfs2_lock_type type)
  44 {
  45         char c;
  46         switch (type) {
  47                 case OCFS2_LOCK_TYPE_META:
  48                         c = 'M';
  49                         break;
  50                 case OCFS2_LOCK_TYPE_DATA:
  51                         c = 'D';
  52                         break;
  53                 case OCFS2_LOCK_TYPE_SUPER:
  54                         c = 'S';
  55                         break;
  56                 case OCFS2_LOCK_TYPE_RENAME:
  57                         c = 'R';
  58                         break;
  59                 case OCFS2_LOCK_TYPE_RW:
  60                         c = 'W';
  61                         break;
  62                 case OCFS2_LOCK_TYPE_DENTRY:
  63                         c = 'N';
  64                         break;
  65                 case OCFS2_LOCK_TYPE_OPEN:
  66                         c = 'O';
  67                         break;
  68                 case OCFS2_LOCK_TYPE_FLOCK:
  69                         c = 'F';
  70                         break;
  71                 case OCFS2_LOCK_TYPE_QINFO:
  72                         c = 'Q';
  73                         break;
  74                 case OCFS2_LOCK_TYPE_NFS_SYNC:
  75                         c = 'Y';
  76                         break;
  77                 case OCFS2_LOCK_TYPE_ORPHAN_SCAN:
  78                         c = 'P';
  79                         break;
  80                 case OCFS2_LOCK_TYPE_REFCOUNT:
  81                         c = 'T';
  82                         break;
  83                 case OCFS2_LOCK_TYPE_TRIM_FS:
  84                         c = 'I';
  85                         break;
  86                 default:
  87                         c = '\0';
  88         }
  89
  90         return c;
  91 }
  92
  93 static char *ocfs2_lock_type_strings[] = {
  94         [OCFS2_LOCK_TYPE_META] = "Meta",
  95         [OCFS2_LOCK_TYPE_DATA] = "Data",
  96         [OCFS2_LOCK_TYPE_SUPER] = "Super",
  97         [OCFS2_LOCK_TYPE_RENAME] = "Rename",
  98         /* Need to differntiate from [R]ename.. serializing writes is the
  99          * important job it does, anyway. */
 100         [OCFS2_LOCK_TYPE_RW] = "Write/Read",
 101         [OCFS2_LOCK_TYPE_DENTRY] = "Dentry",
 102         [OCFS2_LOCK_TYPE_OPEN] = "Open",
 103         [OCFS2_LOCK_TYPE_FLOCK] = "Flock",
 104         [OCFS2_LOCK_TYPE_QINFO] = "Quota",
 105         [OCFS2_LOCK_TYPE_NFS_SYNC] = "NFSSync",
 106         [OCFS2_LOCK_TYPE_ORPHAN_SCAN] = "OrphanScan",
 107         [OCFS2_LOCK_TYPE_REFCOUNT] = "Refcount",
 108         [OCFS2_LOCK_TYPE_TRIM_FS] = "TrimFs",
 109 };
 110
 111 static inline const char *ocfs2_lock_type_string(enum ocfs2_lock_type type)
 112 {
 113 #ifdef __KERNEL__
 114         BUG_ON(type >= OCFS2_NUM_LOCK_TYPES);
 115 #endif
 116         return ocfs2_lock_type_strings[type];
 117 }
 118
 119 #endif  /* OCFS2_LOCKID_H */