The Linux Journalling API
Roger Gammans
<
rgammans@computer-surgery.co.uk
>
Stephen Tweedie
<
sct@redhat.com
>
Copyright
© 2002 Roger Gammans
Table of Contents
Overview
Details
Summary
Data Types
Structures
typedef handle_t
-- The handle_t type represents a single atomic update being performed by some process.
typedef journal_t
-- The journal_t maintains all of the journaling state information for a single filesystem.
struct journal_s
-- The journal_s type is the concrete type associated with journal_t.
Functions
Journal Level
journal_init_inode
-- creates a journal which maps to a inode.
journal_create
-- Initialise the new journal file
journal_update_superblock
-- Update journal sb on disk.
journal_load
-- Read journal from disk.
journal_destroy
-- Release a journal_t structure.
journal_check_used_features
-- Check if features specified are used.
journal_check_available_features
-- Check feature set in journalling layer
journal_set_features
-- Mark a given journal feature in the superblock
journal_update_format
-- Update on-disk journal structure.
journal_flush
-- Flush journal
journal_wipe
-- Wipe journal contents
journal_abort
-- Shutdown the journal immediately.
journal_errno
-- returns the journal's error state.
journal_clear_err
-- clears the journal's error state
journal_ack_err
-- Ack journal err.
journal_recover
-- recovers a on-disk journal
Transasction Level
journal_start
-- Obtain a new handle.
journal_try_start
-- Don't block, but try and get a handle
journal_extend
-- extend buffer credits.
journal_restart
-- restart a handle .
journal_lock_updates
-- establish a transaction barrier.
journal_unlock_updates
-- release barrier
journal_get_write_access
-- notify intent to modify a buffer for metadata (not data) update.
journal_get_create_access
-- notify intent to use newly created bh
journal_get_undo_access
-- Notify intent to modify metadata with non-rewindable consequences
journal_dirty_data
-- mark a buffer as containing dirty data which needs to be flushed before we can commit the current transaction.
journal_dirty_metadata
-- mark a buffer as containing dirty metadata
journal_forget
--
bforget
for potentially-journaled buffers.
journal_stop
-- complete a transaction
journal_try_to_free_buffers
-- try to free page buffers.
journal_flushpage
--
See also
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