b34090e5e2
Currently when we add a buffer to a transaction, we wait until the buffer is removed from BJ_Shadow list (so that we prevent any changes to the buffer that is just written to the journal). This can take unnecessarily long as a lot happens between the time the buffer is submitted to the journal and the time when we remove the buffer from BJ_Shadow list. (e.g. We wait for all data buffers in the transaction, we issue a cache flush, etc.) Also this creates a dependency of do_get_write_access() on transaction commit (namely waiting for data IO to complete) which we want to avoid when implementing transaction reservation. So we modify commit code to set new BH_Shadow flag when temporary shadowing buffer is created and we clear that flag once IO on that buffer is complete. This allows do_get_write_access() to wait only for BH_Shadow bit and thus removes the dependency on data IO completion. Reviewed-by: Zheng Liu <wenqing.lz@taobao.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
45 lines
941 B
C
45 lines
941 B
C
#ifndef _LINUX_JBD_STATE_H
|
|
#define _LINUX_JBD_STATE_H
|
|
|
|
static inline struct buffer_head *jh2bh(struct journal_head *jh)
|
|
{
|
|
return jh->b_bh;
|
|
}
|
|
|
|
static inline struct journal_head *bh2jh(struct buffer_head *bh)
|
|
{
|
|
return bh->b_private;
|
|
}
|
|
|
|
static inline void jbd_lock_bh_state(struct buffer_head *bh)
|
|
{
|
|
bit_spin_lock(BH_State, &bh->b_state);
|
|
}
|
|
|
|
static inline int jbd_trylock_bh_state(struct buffer_head *bh)
|
|
{
|
|
return bit_spin_trylock(BH_State, &bh->b_state);
|
|
}
|
|
|
|
static inline int jbd_is_locked_bh_state(struct buffer_head *bh)
|
|
{
|
|
return bit_spin_is_locked(BH_State, &bh->b_state);
|
|
}
|
|
|
|
static inline void jbd_unlock_bh_state(struct buffer_head *bh)
|
|
{
|
|
bit_spin_unlock(BH_State, &bh->b_state);
|
|
}
|
|
|
|
static inline void jbd_lock_bh_journal_head(struct buffer_head *bh)
|
|
{
|
|
bit_spin_lock(BH_JournalHead, &bh->b_state);
|
|
}
|
|
|
|
static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh)
|
|
{
|
|
bit_spin_unlock(BH_JournalHead, &bh->b_state);
|
|
}
|
|
|
|
#endif
|