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   9         BH_Revoked,             /* Has been revoked from the log */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_Verified,            /* Metadata block has been verified ok */
  16         BH_JBDPrivateStart,     /* First bit available for private use by FS */
  17 };
  18
  19 BUFFER_FNS(JBD, jbd)
  20 BUFFER_FNS(JWrite, jwrite)
  21 BUFFER_FNS(JBDDirty, jbddirty)
  22 TAS_BUFFER_FNS(JBDDirty, jbddirty)
  23 BUFFER_FNS(Revoked, revoked)
  24 TAS_BUFFER_FNS(Revoked, revoked)
  25 BUFFER_FNS(RevokeValid, revokevalid)
  26 TAS_BUFFER_FNS(RevokeValid, revokevalid)
  27 BUFFER_FNS(Freed, freed)
  28 BUFFER_FNS(Verified, verified)
  29
  30 static inline struct buffer_head *jh2bh(struct journal_head *jh)
  31 {
  32         return jh->b_bh;
  33 }
  34
  35 static inline struct journal_head *bh2jh(struct buffer_head *bh)
  36 {
  37         return bh->b_private;
  38 }
  39
  40 static inline void jbd_lock_bh_state(struct buffer_head *bh)
  41 {
  42         bit_spin_lock(BH_State, &bh->b_state);
  43 }
  44
  45 static inline int jbd_trylock_bh_state(struct buffer_head *bh)
  46 {
  47         return bit_spin_trylock(BH_State, &bh->b_state);
  48 }
  49
  50 static inline int jbd_is_locked_bh_state(struct buffer_head *bh)
  51 {
  52         return bit_spin_is_locked(BH_State, &bh->b_state);
  53 }
  54
  55 static inline void jbd_unlock_bh_state(struct buffer_head *bh)
  56 {
  57         bit_spin_unlock(BH_State, &bh->b_state);
  58 }
  59
  60 static inline void jbd_lock_bh_journal_head(struct buffer_head *bh)
  61 {
  62         bit_spin_lock(BH_JournalHead, &bh->b_state);
  63 }
  64
  65 static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh)
  66 {
  67         bit_spin_unlock(BH_JournalHead, &bh->b_state);
  68 }
  69
  70 #endif