fs/ocfs2/ocfs2_lockid.h

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