JOURNAL_S

NAME

SYNOPSIS

struct journal_s {
  unsigned long  j_flags;
  struct buffer_head * j_sb_buffer;
  journal_superblock_t * j_superblock;
  int j_format_version;
  struct semaphore j_barrier;
  /** Wait queue for waiting for a locked transaction to start committing,* or for a barrier lock to be released*/wait_queue_head_t j_wait_transaction_locked;
  wait_queue_head_t j_wait_logspace;
  wait_queue_head_t j_wait_done_commit;
  wait_queue_head_t j_wait_checkpoint;
  wait_queue_head_t j_wait_commit;
  wait_queue_head_t j_wait_updates;
  struct semaphore  j_checkpoint_sem;
  unsigned long  j_last;
  /** Device, blocksize and starting block offset for the location where we* store the journal.*/struct block_device * j_dev;
  int j_blocksize;
  unsigned int  j_blk_offset;
  /** Device which holds the client fs.  For internal journal this will be* equal to j_dev.*/struct block_device * j_fs_dev;
  unsigned int  j_maxlen;
  struct inode  * j_inode;
  struct task_struct * j_task;
  /** Maximum number of metadata buffers to allow in a single compound* commit transaction*/int   j_max_transaction_buffers;
  /** What is the maximum transaction lifetime before we begin a commit?*/unsigned long  j_commit_interval;
  struct timer_list * j_commit_timer;
  struct jbd_revoke_table_s * j_revoke;
};  

MEMBERS

j_flags

General journaling state flags

j_sb_buffer

First part of superblock buffer

j_superblock

Second part of superblock buffer

j_format_version

Version of the superblock format

j_barrier

The barrier lock itself

j_wait_transaction_locked

Wait queue for waiting for a locked transaction to start committing, or for a barrier lock to be released

j_wait_logspace

Wait queue for waiting for checkpointing to complete

j_wait_done_commit

Wait queue for waiting for commit to complete

j_wait_checkpoint

Wait queue to trigger checkpointing

j_wait_commit

Wait queue to trigger commit

j_wait_updates

Wait queue to wait for updates to complete

j_checkpoint_sem

Semaphore for locking against concurrent checkpoints

j_last

The block number one beyond the last usable block

j_dev

Device where we store the journal

j_blocksize

blocksize for the location where we store the journal.

j_blk_offset

starting block offset for into the device where we store the journal

j_fs_dev

Device which holds the client fs. For internal journal this will be equal to j_dev

j_maxlen

Total maximum capacity of the journal region on disk.

j_inode

Optional inode where we store the journal. If present, all journal block numbers are mapped into this inode via bmap.

j_task

Pointer to the current commit thread for this journal

j_max_transaction_buffers

Maximum number of metadata buffers to allow in a single compound commit transaction

j_commit_interval

What is the maximum transaction lifetime before we begin a commit?

j_commit_timer

The timer used to wakeup the commit thread

j_revoke

The revoke table - maintains the list of revoked blocks in the current transaction.

DESCRIPTION

journal_t.  

ABOUT THIS DOCUMENT

This documentation was generated with kernel version 2.6.1.

Index

NAME

SYNOPSIS

MEMBERS

DESCRIPTION

ABOUT THIS DOCUMENT