cregit-Linux how code gets into the kernel

Release 4.12 include/linux/journal-head.h

Directory: include/linux
/*
 * include/linux/journal-head.h
 *
 * buffer_head fields for JBD
 *
 * 27 May 2001 Andrew Morton
 *      Created - pulled out of fs.h
 */

#ifndef JOURNAL_HEAD_H_INCLUDED

#define JOURNAL_HEAD_H_INCLUDED


typedef unsigned int		tid_t;		
/* Unique transaction ID */

typedef struct transaction_s	transaction_t;	
/* Compound transaction type */


struct buffer_head;


struct journal_head {
	/*
         * Points back to our buffer_head. [jbd_lock_bh_journal_head()]
         */
	
struct buffer_head *b_bh;

	/*
         * Reference count - see description in journal.c
         * [jbd_lock_bh_journal_head()]
         */
	
int b_jcount;

	/*
         * Journalling list for this buffer [jbd_lock_bh_state()]
         * NOTE: We *cannot* combine this with b_modified into a bitfield
         * as gcc would then (which the C standard allows but which is
         * very unuseful) make 64-bit accesses to the bitfield and clobber
         * b_jcount if its update races with bitfield modification.
         */
	
unsigned b_jlist;

	/*
         * This flag signals the buffer has been modified by
         * the currently running transaction
         * [jbd_lock_bh_state()]
         */
	
unsigned b_modified;

	/*
         * Copy of the buffer data frozen for writing to the log.
         * [jbd_lock_bh_state()]
         */
	
char *b_frozen_data;

	/*
         * Pointer to a saved copy of the buffer containing no uncommitted
         * deallocation references, so that allocations can avoid overwriting
         * uncommitted deletes. [jbd_lock_bh_state()]
         */
	
char *b_committed_data;

	/*
         * Pointer to the compound transaction which owns this buffer's
         * metadata: either the running transaction or the committing
         * transaction (if there is one).  Only applies to buffers on a
         * transaction's data or metadata journaling list.
         * [j_list_lock] [jbd_lock_bh_state()]
         * Either of these locks is enough for reading, both are needed for
         * changes.
         */
	
transaction_t *b_transaction;

	/*
         * Pointer to the running compound transaction which is currently
         * modifying the buffer's metadata, if there was already a transaction
         * committing it when the new transaction touched it.
         * [t_list_lock] [jbd_lock_bh_state()]
         */
	
transaction_t *b_next_transaction;

	/*
         * Doubly-linked list of buffers on a transaction's data, metadata or
         * forget queue. [t_list_lock] [jbd_lock_bh_state()]
         */
	

struct journal_head *b_tnext, *b_tprev;

	/*
         * Pointer to the compound transaction against which this buffer
         * is checkpointed.  Only dirty buffers can be checkpointed.
         * [j_list_lock]
         */
	
transaction_t *b_cp_transaction;

	/*
         * Doubly-linked list of buffers still remaining to be flushed
         * before an old transaction can be checkpointed.
         * [j_list_lock]
         */
	

struct journal_head *b_cpnext, *b_cpprev;

	/* Trigger type */
	
struct jbd2_buffer_trigger_type *b_triggers;

	/* Trigger type for the committing transaction's frozen data */
	
struct jbd2_buffer_trigger_type *b_frozen_triggers;
};

#endif		/* JOURNAL_HEAD_H_INCLUDED */

Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds7673.79%111.11%
Joel Becker1211.65%111.11%
Andrew Morton87.77%222.22%
Alex Tomas32.91%111.11%
Jan Kara21.94%222.22%
Amir Goldstein10.97%111.11%
Francois Cami10.97%111.11%
Total103100.00%9100.00%
Directory: include/linux
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