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https://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git
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3b5386dca8
journal.c: implement loading of ext3 journal for recovery code problem.c (fix_problem): return answer from PR_AFTER_CODE to caller. Add journal problems. recovery.c (journal_recover): user-space ext3 journal recovery code unix.c (main) : check journal and do recovery in separate steps jfs.h, recovery.c: Files ext3 kernel code. jfs_compat.h: Compatibility header file to allow kernel code to be linked to e2fsck.
532 lines
15 KiB
C
532 lines
15 KiB
C
/*
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* linux/include/linux/jfs.h
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*
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* Written by Stephen C. Tweedie <sct@redhat.com>, 1998
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*
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* Copyright 1998 Red Hat corp --- All Rights Reserved
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*
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* This file is part of the Linux kernel and is made available under
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* the terms of the GNU General Public License, version 2, or at your
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* option, any later version, incorporated herein by reference.
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*
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* Definitions for transaction data structures for the buffer cache
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* filesystem journaling support.
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*/
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#ifndef _LINUX_JFS_H
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#define _LINUX_JFS_H
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#ifndef __KERNEL__
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#include "jfs_compat.h"
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#endif
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/*
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* Debug code
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*/
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/* #define JFS_DEBUG */
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#ifdef JFS_DEBUG
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extern int jfs_enable_debug;
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#define jfs_debug(n, f, a...) \
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do { \
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if ((n) <= jfs_enable_debug) { \
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printk (KERN_DEBUG "JFS DEBUG: (%s, %d): %s: ", \
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__FILE__, __LINE__, __FUNCTION__); \
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printk (f, ## a); \
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} \
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} while (0)
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#else
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#define jfs_debug(f, a...) /**/
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#endif
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#define JFS_MIN_JOURNAL_BLOCKS 1024
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/*
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* Internal structures used by the logging mechanism:
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*/
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#define JFS_MAGIC_NUMBER 0xc03b3998U /* The first 4 bytes of /dev/random! */
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/*
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* On-disk structures
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*/
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/*
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* Descriptor block types:
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*/
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#define JFS_DESCRIPTOR_BLOCK 1
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#define JFS_COMMIT_BLOCK 2
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#define JFS_SUPERBLOCK 3
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/*
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* Standard header for all descriptor blocks:
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*/
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typedef struct journal_header_s
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{
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__u32 h_magic;
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__u32 h_blocktype;
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__u32 h_sequence;
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} journal_header_t;
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/*
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* The block tag: used to describe a single buffer in the journal
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*/
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typedef struct journal_block_tag_s
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{
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__u32 t_blocknr; /* The on-disk block number */
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__u32 t_flags; /* See below */
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} journal_block_tag_t;
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/* Definitions for the journal tag flags word: */
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#define JFS_FLAG_ESCAPE 1 /* on-disk block is escaped */
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#define JFS_FLAG_SAME_UUID 2 /* block has same uuid as previous */
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#define JFS_FLAG_DELETED 4 /* block deleted by this transaction */
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#define JFS_FLAG_LAST_TAG 8 /* last tag in this descriptor block */
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/*
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* The journal superblock
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*/
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typedef struct journal_superblock_s
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{
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journal_header_t s_header;
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/* Static information describing the journal */
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__u32 s_blocksize; /* journal device blocksize */
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__u32 s_maxlen; /* total blocks in journal file */
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__u32 s_first; /* first block of log information */
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/* Dynamic information describing the current state of the log */
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__u32 s_sequence; /* first commit ID expected in log */
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__u32 s_start; /* blocknr of start of log */
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} journal_superblock_t;
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#ifdef __KERNEL__
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#include <asm/semaphone.h>
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#include <linux/fs.h>
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#define J_ASSERT(assert) \
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do { if (!(assert)) { \
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printk (KERN_CRIT \
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"Assertion failure in %s() at %s line %d: " \
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"\"%s\"\n", \
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__FUNCTION__, __FILE__, __LINE__, # assert); \
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* ((char *) 0) = 0; \
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} } while (0)
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/* The handle_t type represents a single atomic update being performed
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* by some process. All filesystem modifications made by the process go
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* through this handle. Recursive operations (such as quota operations)
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* are gathered into a single update.
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*
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* The buffer credits field is used to account for journaled buffers
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* being modified by the running process. To ensure that there is
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* enough log space for all outstanding operations, we need to limit the
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* number of outstanding buffers possible at any time. When the
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* operation completes, any buffer credits not used are credited back to
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* the transaction, so that at all times we know how many buffers the
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* outstanding updates on a transaction might possibly touch. */
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struct handle_s
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{
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/* Which compound transaction is this update a part of? */
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transaction_t * h_transaction;
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/* Number of remaining buffers we are allowed to dirty: */
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int h_buffer_credits;
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/* Reference count on this handle */
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int h_ref;
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/* Flags */
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unsigned int h_sync : 1; /* sync-on-close */
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};
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/* The transaction_t type is the guts of the journaling mechanism. It
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* tracks a compound transaction through its various states:
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*
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* RUNNING: accepting new updates
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* LOCKED: Updates still running but we don't accept new ones
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* RUNDOWN: Updates are tidying up but have finished requesting
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* new buffers to modify (state not used for now)
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* FLUSH: All updates complete, but we are still writing to disk
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* COMMIT: All data on disk, writing commit record
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* FINISHED: We still have to keep the transaction for checkpointing.
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*
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* The transaction keeps track of all of the buffers modified by a
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* running transaction, and all of the buffers committed but not yet
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* flushed to home for finished transactions.
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*/
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struct transaction_s
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{
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/* Pointer to the journal for this transaction. */
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journal_t * t_journal;
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/* Sequence number for this transaction */
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tid_t t_tid;
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/* Transaction's current state */
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enum {
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T_RUNNING,
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T_LOCKED,
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T_RUNDOWN,
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T_FLUSH,
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T_COMMIT,
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T_FINISHED
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} t_state;
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/* Where in the log does this transaction's commit start? */
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unsigned long t_log_start;
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/* Doubly-linked circular list of all inodes owned by this
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transaction */
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struct inode * t_ilist;
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/* Number of buffers on the t_buffers list */
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int t_nr_buffers;
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/* Doubly-linked circular list of all buffers reserved but not
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yet modified by this transaction */
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struct buffer_head * t_reserved_list;
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/* Doubly-linked circular list of all metadata buffers owned by this
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transaction */
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struct buffer_head * t_buffers;
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/* Doubly-linked circular list of all data buffers still to be
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flushed before this transaction can be committed */
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struct buffer_head * t_datalist;
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/* Doubly-linked circular list of all forget buffers (superceded
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buffers which we can un-checkpoint once this transaction
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commits) */
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struct buffer_head * t_forget;
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/* Doubly-linked circular list of all buffers still to be
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flushed before this transaction can be checkpointed */
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struct buffer_head * t_checkpoint_list;
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/* Doubly-linked circular list of temporary buffers currently
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undergoing IO in the log */
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struct buffer_head * t_iobuf_list;
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/* Doubly-linked circular list of metadata buffers being
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shadowed by log IO. The IO buffers on the iobuf list and the
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shadow buffers on this list match each other one for one at
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all times. */
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struct buffer_head * t_shadow_list;
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/* Doubly-linked circular list of control buffers being written
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to the log. */
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struct buffer_head * t_log_list;
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/* Number of outstanding updates running on this transaction */
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int t_updates;
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/* Number of buffers reserved for use by all handles in this
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* transaction handle but not yet modified. */
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int t_outstanding_credits;
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/* Wait queue to wait for updates to complete */
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struct wait_queue * t_wait;
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/* Forward and backward links for the circular list of all
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* transactions awaiting checkpoint */
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transaction_t *t_cpnext, *t_cpprev;
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/* When will the transaction expire (become due for commit), in
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* jiffies ? */
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unsigned long t_expires;
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};
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#endif /* __KERNEL__ */
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/* The journal_t maintains all of the journaling state information for a
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* single filesystem. It is linked to from the fs superblock structure.
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*
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* We use the journal_t to keep track of all outstanding transaction
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* activity on the filesystem, and to manage the state of the log
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* writing process. */
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struct journal_s
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{
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/* General journaling state flags */
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unsigned long j_flags;
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/* The superblock buffer */
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struct buffer_head * j_sb_buffer;
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journal_superblock_t * j_superblock;
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#ifdef __KERNEL__
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/* Transactions: The current running transaction... */
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transaction_t * j_running_transaction;
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/* ... the transaction we are pushing to disk ... */
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transaction_t * j_committing_transaction;
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/* ... and a linked circular list of all transactions waiting
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* for checkpointing. */
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transaction_t * j_checkpoint_transactions;
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/* Wait queue for locking of the journal structure. */
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struct wait_queue * j_wait_lock;
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/* Wait queue for waiting for a locked transaction to start
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committing */
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struct wait_queue * j_wait_transaction_locked;
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/* Wait queue for waiting for checkpointing to complete */
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struct wait_queue * j_wait_logspace;
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/* Wait queue for waiting for commit to complete */
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struct wait_queue * j_wait_done_commit;
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/* Wait queue to trigger checkpointing */
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struct wait_queue * j_wait_checkpoint;
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/* Wait queue to trigger commit */
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struct wait_queue * j_wait_commit;
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/* Semaphore for locking against concurrent checkpoints */
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struct semaphore j_checkpoint_sem;
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/* Journal running state: */
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/* The lock flag is *NEVER* touched from interrupts. */
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unsigned int j_locked : 1;
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/* Pointer to the current commit thread for this journal */
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struct task_struct * j_task;
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/* The timer used to wakeup the commit thread: */
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struct timer_list * j_commit_timer;
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int j_commit_timer_active;
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#endif
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/* Journal head: identifies the first unused block in the journal. */
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unsigned long j_head;
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/* Journal tail: identifies the oldest still-used block in the
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* journal. */
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unsigned long j_tail;
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/* Journal free: how many free blocks are there in the journal? */
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unsigned long j_free;
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/* Journal start and end: the block numbers of the first usable
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* block and one beyond the last usable block in the journal. */
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unsigned long j_first, j_last;
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/* Device, blocksize and starting block offset for the location
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* where we store the journal. */
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kdev_t j_dev;
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int j_blocksize;
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unsigned int j_blk_offset;
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/* Total maximum capacity of the journal region on disk. */
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unsigned int j_maxlen;
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/* Optional inode where we store the journal. If present, all
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* journal block numbers are mapped into this inode via
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* bmap(). */
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struct inode * j_inode;
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/* Sequence number of the oldest transaction in the log */
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tid_t j_tail_sequence;
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/* Sequence number of the next transaction to grant */
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tid_t j_transaction_sequence;
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/* Sequence number of the most recently committed transaction */
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tid_t j_commit_sequence;
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/* Sequence number of the most recent transaction wanting commit */
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tid_t j_commit_request;
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/* Journal uuid: identifies the object (filesystem, LVM volume
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* etc) backed by this journal. This will eventually be
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* replaced by an array of uuids, allowing us to index multiple
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* devices within a single journal and to perform atomic updates
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* across them. */
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__u8 j_uuid[16];
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/* Maximum number of metadata buffers to allow in a single
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* compound commit transaction */
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int j_max_transaction_buffers;
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/* What is the maximum transaction lifetime before we begin a
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* commit? */
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unsigned long j_commit_interval;
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};
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#ifdef __KERNEL__
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/*
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* Journal flag definitions
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*/
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#define JFS_UNMOUNT 1 /* Journal thread is being destroyed */
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#define JFS_SYNC 2 /* Perform synchronous transaction commits */
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/*
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* Journaling internal variables/parameters
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*/
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extern int journal_flush_nr_buffers;
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/*
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* Function declarations for the journaling transaction and buffer
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* management
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*/
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/* Filing buffers */
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extern void journal_unfile_buffer(struct buffer_head *);
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extern void journal_refile_buffer(struct buffer_head *);
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extern void journal_file_buffer(struct buffer_head *, transaction_t *, int);
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extern void journal_clean_data_list(transaction_t *transaction);
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/* Log buffer allocation */
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extern struct buffer_head * journal_get_descriptor_buffer(journal_t *);
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extern unsigned long journal_next_log_block(journal_t *);
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/* Commit management */
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extern void journal_commit_transaction(journal_t *);
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/* Checkpoint list management */
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extern void journal_remove_checkpoint(struct buffer_head *);
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extern void journal_insert_checkpoint(struct buffer_head *, transaction_t *);
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/* Buffer IO */
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extern int
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journal_write_metadata_buffer(transaction_t *transaction,
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struct buffer_head *bh_in,
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struct buffer_head **bh_out,
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int blocknr);
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/* Create and destroy transactions */
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extern transaction_t * get_transaction (journal_t *);
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extern void put_transaction (transaction_t *);
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/* Notify state transitions (called by the log writer thread): */
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extern int set_transaction_state (transaction_t *, int);
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/*
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* Transaction locking
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*
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* We need to lock the journal during transaction state changes so that
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* nobody ever tries to take a handle on the running transaction while
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* we are in the middle of moving it to the commit phase.
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*
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* Note that the locking is completely interrupt unsafe. We never touch
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* journal structures from interrupts.
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*/
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static inline void __wait_on_journal (journal_t * journal)
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{
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while (journal->j_locked)
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sleep_on (&journal->j_wait_lock);
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}
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/* Journal locking. In 2.2, we assume that the kernel lock is already
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* held. */
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static inline void lock_journal (journal_t * journal)
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{
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if (journal->j_locked)
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__wait_on_journal(journal);
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journal->j_locked = 1;
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}
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static inline int try_lock_journal (journal_t * journal)
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{
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if (journal->j_locked)
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return 1;
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journal->j_locked = 1;
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return 0;
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}
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static inline void unlock_journal (journal_t * journal)
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{
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J_ASSERT (journal->j_locked);
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journal->j_locked = 0;
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wake_up(&journal->j_wait_lock);
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}
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/* This function is gross, but unfortunately we need it as long as
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* existing filesystems want to guard against races by testing
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* bh->b_count. @@@ Remove this? We no longer abuse b_count so badly!
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*/
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static inline int journal_is_buffer_shared(struct buffer_head *bh)
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{
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int count = bh->b_count;
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J_ASSERT (count >= 1);
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return (count > 1);
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}
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/* Debugging code only: */
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#define jfs_ENOSYS() \
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do { \
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printk (KERN_ERR "JFS unimplemented function " __FUNCTION__); \
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current->state = TASK_UNINTERRUPTIBLE; \
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schedule(); \
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} while (1)
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/* The log thread user interface:
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*
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* Request space in the current transaction, and force transaction commit
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* transitions on demand.
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*/
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extern int log_space_left (journal_t *); /* Called with journal locked */
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extern void log_start_commit (journal_t *, transaction_t *);
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extern void log_wait_commit (journal_t *, tid_t);
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extern int log_do_checkpoint (journal_t *, int);
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extern void log_wait_for_space(journal_t *, int nblocks);
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extern void journal_drop_transaction(journal_t *, transaction_t *);
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/* The journaling code user interface:
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*
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* Create and destroy handles
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* Register buffer modifications against the current transaction.
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*/
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extern handle_t *journal_start (journal_t *, int nblocks);
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extern int journal_restart (handle_t *, int nblocks);
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extern int journal_extend (handle_t *, int nblocks);
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extern int journal_get_write_access (handle_t *, struct buffer_head *);
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extern int journal_get_create_access (handle_t *, struct buffer_head *);
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extern int journal_get_undo_access (handle_t *, struct buffer_head *);
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extern int journal_dirty_data (handle_t *, struct buffer_head *);
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extern int journal_dirty_metadata (handle_t *, struct buffer_head *);
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extern void journal_release_buffer (handle_t *, struct buffer_head *);
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extern void journal_forget (handle_t *, struct buffer_head *);
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extern void journal_sync_buffer (struct buffer_head *);
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extern int journal_stop (handle_t *);
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extern int journal_flush (journal_t *);
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extern journal_t * journal_init_dev (kdev_t, int start, int len, int bsize);
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extern journal_t * journal_init_inode (struct inode *);
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extern int journal_create (journal_t *);
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extern int journal_load (journal_t *);
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extern void journal_release (journal_t *);
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extern void journal_update_superblock (journal_t *, int);
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#endif /* __KERNEL__ */
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extern int journal_recover (journal_t *);
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#endif /* _LINUX_JFS_H */
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