include/linux/jbd_common.h

   1 #ifndef _LINUX_JBD_STATE_H
   2 #define _LINUX_JBD_STATE_H
   3
   4 enum jbd_state_bits {
   5         BH_JBD                  /* Has an attached ext3 journal_head */
   6           = BH_PrivateStart,
   7         BH_JWrite,              /* Being written to log (@@@ DEBUGGING) */
   8         BH_Freed,               /* Has been freed (truncated) */
   9         BH_Revoked,             /* Has been revoked from the log */
  10         BH_RevokeValid,         /* Revoked flag is valid */
  11         BH_JBDDirty,            /* Is dirty but journaled */
  12         BH_State,               /* Pins most journal_head state */
  13         BH_JournalHead,         /* Pins bh->b_private and jh->b_bh */
  14         BH_Unshadow,            /* Dummy bit, for BJ_Shadow wakeup filtering */
  15         BH_JBDPrivateStart,     /* First bit available for private use by FS */
  16 };
  17
  18 BUFFER_FNS(JBD, jbd)
  19 BUFFER_FNS(JWrite, jwrite)
  20 BUFFER_FNS(JBDDirty, jbddirty)
  21 TAS_BUFFER_FNS(JBDDirty, jbddirty)
  22 BUFFER_FNS(Revoked, revoked)
  23 TAS_BUFFER_FNS(Revoked, revoked)
  24 BUFFER_FNS(RevokeValid, revokevalid)
  25 TAS_BUFFER_FNS(RevokeValid, revokevalid)
  26 BUFFER_FNS(Freed, freed)
  27
  28 static inline struct buffer_head *jh2bh(struct journal_head *jh)
  29 {
  30         return jh->b_bh;
  31 }
  32
  33 static inline struct journal_head *bh2jh(struct buffer_head *bh)
  34 {
  35         return bh->b_private;
  36 }
  37
  38 static inline void jbd_lock_bh_state(struct buffer_head *bh)
  39 {
  40         bit_spin_lock(BH_State, &bh->b_state);
  41 }
  42
  43 static inline int jbd_trylock_bh_state(struct buffer_head *bh)
  44 {
  45         return bit_spin_trylock(BH_State, &bh->b_state);
  46 }
  47
  48 static inline int jbd_is_locked_bh_state(struct buffer_head *bh)
  49 {
  50         return bit_spin_is_locked(BH_State, &bh->b_state);
  51 }
  52
  53 static inline void jbd_unlock_bh_state(struct buffer_head *bh)
  54 {
  55         bit_spin_unlock(BH_State, &bh->b_state);
  56 }
  57
  58 static inline void jbd_lock_bh_journal_head(struct buffer_head *bh)
  59 {
  60         bit_spin_lock(BH_JournalHead, &bh->b_state);
  61 }
  62
  63 static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh)
  64 {
  65         bit_spin_unlock(BH_JournalHead, &bh->b_state);
  66 }
  67
  68 #endif