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911 lines
28 KiB
C
911 lines
28 KiB
C
/*
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* linux/include/linux/jbd.h
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*
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* Written by Stephen C. Tweedie <sct@redhat.com>
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*
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* Copyright 1998-2000 Red Hat, Inc --- 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_JBD_H
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#define _LINUX_JBD_H
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#if defined(CONFIG_JBD) || defined(CONFIG_JBD_MODULE) || !defined(__KERNEL__)
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/* Allow this file to be included directly into e2fsprogs */
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#ifndef __KERNEL__
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#include "jfs_compat.h"
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#define JFS_DEBUG
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#define jfs_debug jbd_debug
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#else
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#include <linux/journal-head.h>
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#include <linux/stddef.h>
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#include <asm/semaphore.h>
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#endif
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#ifndef __GNUC__
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#define __FUNCTION__ ""
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#endif
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#define journal_oom_retry 1
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#ifdef __STDC__
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#ifdef __CONFIG_JBD_DEBUG__E2FS
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/*
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* Define JBD_EXPENSIVE_CHECKING to enable more expensive internal
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* consistency checks. By default we don't do this unless
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* __CONFIG_JBD_DEBUG__E2FS is on.
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*/
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#define JBD_EXPENSIVE_CHECKING
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extern int journal_enable_debug;
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#define jbd_debug(n, f, a...) \
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do { \
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if ((n) <= journal_enable_debug) { \
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printk (KERN_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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#ifdef __GNUC__
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#define jbd_debug(f, a...) /**/
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#else
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#define jbd_debug(f, ...) /**/
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#endif
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#endif
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#else
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#define jbd_debug(x) /* AIX doesn't do STDC */
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#endif
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extern void * __jbd_kmalloc (char *where, size_t size, int flags, int retry);
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#define jbd_kmalloc(size, flags) \
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__jbd_kmalloc(__FUNCTION__, (size), (flags), journal_oom_retry)
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#define jbd_rep_kmalloc(size, flags) \
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__jbd_kmalloc(__FUNCTION__, (size), (flags), 1)
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#define JFS_MIN_JOURNAL_BLOCKS 1024
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#ifdef __KERNEL__
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typedef struct handle_s handle_t; /* Atomic operation type */
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typedef struct journal_s journal_t; /* Journal control structure */
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#endif
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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_V1 3
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#define JFS_SUPERBLOCK_V2 4
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#define JFS_REVOKE_BLOCK 5
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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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/*
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* The revoke descriptor: used on disk to describe a series of blocks to
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* be revoked from the log
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*/
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typedef struct journal_revoke_header_s
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{
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journal_header_t r_header;
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int r_count; /* Count of bytes used in the block */
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} journal_revoke_header_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. All fields are in big-endian byte order.
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*/
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typedef struct journal_superblock_s
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{
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/* 0x0000 */
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journal_header_t s_header;
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/* 0x000C */
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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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/* 0x0018 */
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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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/* 0x0020 */
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/* Error value, as set by journal_abort(). */
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__s32 s_errno;
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/* 0x0024 */
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/* Remaining fields are only valid in a version-2 superblock */
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__u32 s_feature_compat; /* compatible feature set */
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__u32 s_feature_incompat; /* incompatible feature set */
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__u32 s_feature_ro_compat; /* readonly-compatible feature set */
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/* 0x0030 */
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__u8 s_uuid[16]; /* 128-bit uuid for journal */
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/* 0x0040 */
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__u32 s_nr_users; /* Nr of filesystems sharing log */
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__u32 s_dynsuper; /* Blocknr of dynamic superblock copy*/
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/* 0x0048 */
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__u32 s_max_transaction; /* Limit of journal blocks per trans.*/
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__u32 s_max_trans_data; /* Limit of data blocks per trans. */
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/* 0x0050 */
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__u32 s_padding[44];
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/* 0x0100 */
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__u8 s_users[16*48]; /* ids of all fs'es sharing the log */
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/* 0x0400 */
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} journal_superblock_t;
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#define JFS_HAS_COMPAT_FEATURE(j,mask) \
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((j)->j_format_version >= 2 && \
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((j)->j_superblock->s_feature_compat & cpu_to_be32((mask))))
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#define JFS_HAS_RO_COMPAT_FEATURE(j,mask) \
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((j)->j_format_version >= 2 && \
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((j)->j_superblock->s_feature_ro_compat & cpu_to_be32((mask))))
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#define JFS_HAS_INCOMPAT_FEATURE(j,mask) \
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((j)->j_format_version >= 2 && \
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((j)->j_superblock->s_feature_incompat & cpu_to_be32((mask))))
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#define JFS_FEATURE_INCOMPAT_REVOKE 0x00000001
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/* Features known to this kernel version: */
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#define JFS_KNOWN_COMPAT_FEATURES 0
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#define JFS_KNOWN_ROCOMPAT_FEATURES 0
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#define JFS_KNOWN_INCOMPAT_FEATURES JFS_FEATURE_INCOMPAT_REVOKE
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#ifdef __KERNEL__
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#include <linux/fs.h>
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#include <linux/sched.h>
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#define JBD_ASSERTIONS
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#ifdef JBD_ASSERTIONS
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#define J_ASSERT(assert) \
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do { \
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if (!(assert)) { \
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printk (KERN_EMERG \
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"Assertion failure in %s() at %s:%d: \"%s\"\n", \
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__FUNCTION__, __FILE__, __LINE__, # assert); \
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BUG(); \
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} \
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} while (0)
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#if defined(CONFIG_BUFFER_DEBUG)
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void buffer_assertion_failure(struct buffer_head *bh);
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#define J_ASSERT_BH(bh, expr) \
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do { \
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if (!(expr)) \
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buffer_assertion_failure(bh); \
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J_ASSERT(expr); \
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} while (0)
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#define J_ASSERT_JH(jh, expr) J_ASSERT_BH(jh2bh(jh), expr)
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#else
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#define J_ASSERT_BH(bh, expr) J_ASSERT(expr)
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#define J_ASSERT_JH(jh, expr) J_ASSERT(expr)
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#endif
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#else
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#define J_ASSERT(assert)
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#endif /* JBD_ASSERTIONS */
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enum jbd_state_bits {
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BH_JWrite
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= BH_PrivateStart, /* 1 if being written to log (@@@ DEBUGGING) */
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BH_Freed, /* 1 if buffer has been freed (truncated) */
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BH_Revoked, /* 1 if buffer has been revoked from the log */
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BH_RevokeValid, /* 1 if buffer revoked flag is valid */
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BH_JBDDirty, /* 1 if buffer is dirty but journaled */
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};
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/* Return true if the buffer is one which JBD is managing */
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static inline int buffer_jbd(struct buffer_head *bh)
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{
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return __buffer_state(bh, JBD);
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}
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static inline struct buffer_head *jh2bh(struct journal_head *jh)
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{
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return jh->b_bh;
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}
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static inline struct journal_head *bh2jh(struct buffer_head *bh)
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{
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return bh->b_private;
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}
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struct jbd_revoke_table_s;
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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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/* Field for caller's use to track errors through large fs
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operations */
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int h_err;
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/* Flags */
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unsigned int h_sync: 1; /* sync-on-close */
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unsigned int h_jdata: 1; /* force data journaling */
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unsigned int h_aborted: 1; /* fatal error on handle */
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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 */ /* AKPM: unused */
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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 journal_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 journal_head * t_buffers;
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/*
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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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* Protected by journal_datalist_lock.
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*/
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struct journal_head * t_sync_datalist;
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/*
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* Doubly-linked circular list of all writepage data buffers
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* still to be written before this transaction can be committed.
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* Protected by journal_datalist_lock.
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*/
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struct journal_head * t_async_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 journal_head * t_forget;
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/*
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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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*/
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/* Protected by journal_datalist_lock */
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struct journal_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 journal_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 journal_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 journal_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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/*
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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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*/
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/* Protected by journal_datalist_lock */
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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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/* How many handles used this transaction? */
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int t_handle_count;
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};
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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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/* Is there an outstanding uncleared error on the journal (from
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* a prior abort)? */
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int j_errno;
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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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/* Version of the superblock format */
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int j_format_version;
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/* Number of processes waiting to create a barrier lock */
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int j_barrier_count;
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/* The barrier lock itself */
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struct semaphore j_barrier;
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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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/* Protected by journal_datalist_lock */
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transaction_t * j_checkpoint_transactions;
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/* Wait queue for waiting for a locked transaction to start
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committing, or for a barrier lock to be released */
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wait_queue_head_t j_wait_transaction_locked;
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/* Wait queue for waiting for checkpointing to complete */
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wait_queue_head_t j_wait_logspace;
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/* Wait queue for waiting for commit to complete */
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wait_queue_head_t j_wait_done_commit;
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/* Wait queue to trigger checkpointing */
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wait_queue_head_t j_wait_checkpoint;
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/* Wait queue to trigger commit */
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wait_queue_head_t j_wait_commit;
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/* Wait queue to wait for updates to complete */
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wait_queue_head_t j_wait_updates;
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/* Semaphore for locking against concurrent checkpoints */
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struct semaphore j_checkpoint_sem;
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/* The main journal lock, used by lock_journal() */
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struct semaphore j_sem;
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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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/* Device which holds the client fs. For internal journal this
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* will be equal to j_dev. */
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kdev_t j_fs_dev;
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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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/* Pointer to the current commit thread for this journal */
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struct task_struct * j_task;
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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;
|
|
|
|
/* What is the maximum transaction lifetime before we begin a
|
|
* commit? */
|
|
unsigned long j_commit_interval;
|
|
|
|
/* The timer used to wakeup the commit thread: */
|
|
struct timer_list * j_commit_timer;
|
|
int j_commit_timer_active;
|
|
|
|
/* Link all journals together - system-wide */
|
|
struct list_head j_all_journals;
|
|
|
|
/* The revoke table: maintains the list of revoked blocks in the
|
|
current transaction. */
|
|
struct jbd_revoke_table_s *j_revoke;
|
|
};
|
|
|
|
/*
|
|
* Journal flag definitions
|
|
*/
|
|
#define JFS_UNMOUNT 0x001 /* Journal thread is being destroyed */
|
|
#define JFS_ABORT 0x002 /* Journaling has been aborted for errors. */
|
|
#define JFS_ACK_ERR 0x004 /* The errno in the sb has been acked */
|
|
#define JFS_FLUSHED 0x008 /* The journal superblock has been flushed */
|
|
#define JFS_LOADED 0x010 /* The journal superblock has been loaded */
|
|
|
|
/*
|
|
* Function declarations for the journaling transaction and buffer
|
|
* management
|
|
*/
|
|
|
|
/* Filing buffers */
|
|
extern void __journal_unfile_buffer(struct journal_head *);
|
|
extern void journal_unfile_buffer(struct journal_head *);
|
|
extern void __journal_refile_buffer(struct journal_head *);
|
|
extern void journal_refile_buffer(struct journal_head *);
|
|
extern void __journal_file_buffer(struct journal_head *, transaction_t *, int);
|
|
extern void __journal_free_buffer(struct journal_head *bh);
|
|
extern void journal_file_buffer(struct journal_head *, transaction_t *, int);
|
|
extern void __journal_clean_data_list(transaction_t *transaction);
|
|
|
|
/* Log buffer allocation */
|
|
extern struct journal_head * journal_get_descriptor_buffer(journal_t *);
|
|
extern unsigned long journal_next_log_block(journal_t *);
|
|
|
|
/* Commit management */
|
|
extern void journal_commit_transaction(journal_t *);
|
|
|
|
/* Checkpoint list management */
|
|
int __journal_clean_checkpoint_list(journal_t *journal);
|
|
extern void journal_remove_checkpoint(struct journal_head *);
|
|
extern void __journal_remove_checkpoint(struct journal_head *);
|
|
extern void journal_insert_checkpoint(struct journal_head *, transaction_t *);
|
|
extern void __journal_insert_checkpoint(struct journal_head *,transaction_t *);
|
|
|
|
/* Buffer IO */
|
|
extern int
|
|
journal_write_metadata_buffer(transaction_t *transaction,
|
|
struct journal_head *jh_in,
|
|
struct journal_head **jh_out,
|
|
int blocknr);
|
|
|
|
/* Transaction locking */
|
|
extern void __wait_on_journal (journal_t *);
|
|
|
|
/*
|
|
* Journal locking.
|
|
*
|
|
* We need to lock the journal during transaction state changes so that
|
|
* nobody ever tries to take a handle on the running transaction while
|
|
* we are in the middle of moving it to the commit phase.
|
|
*
|
|
* Note that the locking is completely interrupt unsafe. We never touch
|
|
* journal structures from interrupts.
|
|
*
|
|
* In 2.2, the BKL was required for lock_journal. This is no longer
|
|
* the case.
|
|
*/
|
|
|
|
static inline void lock_journal(journal_t *journal)
|
|
{
|
|
down(&journal->j_sem);
|
|
}
|
|
|
|
/* This returns zero if we acquired the semaphore */
|
|
static inline int try_lock_journal(journal_t * journal)
|
|
{
|
|
return down_trylock(&journal->j_sem);
|
|
}
|
|
|
|
static inline void unlock_journal(journal_t * journal)
|
|
{
|
|
up(&journal->j_sem);
|
|
}
|
|
|
|
|
|
static inline handle_t *journal_current_handle(void)
|
|
{
|
|
return current->journal_info;
|
|
}
|
|
|
|
/* The journaling code user interface:
|
|
*
|
|
* Create and destroy handles
|
|
* Register buffer modifications against the current transaction.
|
|
*/
|
|
|
|
extern handle_t *journal_start(journal_t *, int nblocks);
|
|
extern handle_t *journal_try_start(journal_t *, int nblocks);
|
|
extern int journal_restart (handle_t *, int nblocks);
|
|
extern int journal_extend (handle_t *, int nblocks);
|
|
extern int journal_get_write_access (handle_t *, struct buffer_head *);
|
|
extern int journal_get_create_access (handle_t *, struct buffer_head *);
|
|
extern int journal_get_undo_access (handle_t *, struct buffer_head *);
|
|
extern int journal_dirty_data (handle_t *,
|
|
struct buffer_head *, int async);
|
|
extern int journal_dirty_metadata (handle_t *, struct buffer_head *);
|
|
extern void journal_release_buffer (handle_t *, struct buffer_head *);
|
|
extern void journal_forget (handle_t *, struct buffer_head *);
|
|
extern void journal_sync_buffer (struct buffer_head *);
|
|
extern int journal_flushpage(journal_t *, struct page *, unsigned long);
|
|
extern int journal_try_to_free_buffers(journal_t *, struct page *, int);
|
|
extern int journal_stop(handle_t *);
|
|
extern int journal_flush (journal_t *);
|
|
|
|
extern void journal_lock_updates (journal_t *);
|
|
extern void journal_unlock_updates (journal_t *);
|
|
|
|
extern journal_t * journal_init_dev(kdev_t dev, kdev_t fs_dev,
|
|
int start, int len, int bsize);
|
|
extern journal_t * journal_init_inode (struct inode *);
|
|
extern int journal_update_format (journal_t *);
|
|
extern int journal_check_used_features
|
|
(journal_t *, unsigned long, unsigned long, unsigned long);
|
|
extern int journal_check_available_features
|
|
(journal_t *, unsigned long, unsigned long, unsigned long);
|
|
extern int journal_set_features
|
|
(journal_t *, unsigned long, unsigned long, unsigned long);
|
|
extern int journal_create (journal_t *);
|
|
extern int journal_load (journal_t *journal);
|
|
extern void journal_destroy (journal_t *);
|
|
extern int journal_recover (journal_t *journal);
|
|
extern int journal_wipe (journal_t *, int);
|
|
extern int journal_skip_recovery (journal_t *);
|
|
extern void journal_update_superblock (journal_t *, int);
|
|
extern void __journal_abort (journal_t *);
|
|
extern void journal_abort (journal_t *, int);
|
|
extern int journal_errno (journal_t *);
|
|
extern void journal_ack_err (journal_t *);
|
|
extern int journal_clear_err (journal_t *);
|
|
extern unsigned long journal_bmap(journal_t *journal, unsigned long blocknr);
|
|
extern int journal_force_commit(journal_t *journal);
|
|
|
|
/*
|
|
* journal_head management
|
|
*/
|
|
extern struct journal_head
|
|
*journal_add_journal_head(struct buffer_head *bh);
|
|
extern void journal_remove_journal_head(struct buffer_head *bh);
|
|
extern void __journal_remove_journal_head(struct buffer_head *bh);
|
|
extern void journal_unlock_journal_head(struct journal_head *jh);
|
|
|
|
/* Primary revoke support */
|
|
#define JOURNAL_REVOKE_DEFAULT_HASH 256
|
|
extern int journal_init_revoke(journal_t *, int);
|
|
extern void journal_destroy_revoke_caches(void);
|
|
extern int journal_init_revoke_caches(void);
|
|
|
|
extern void journal_destroy_revoke(journal_t *);
|
|
extern int journal_revoke (handle_t *,
|
|
unsigned long, struct buffer_head *);
|
|
extern int journal_cancel_revoke(handle_t *, struct journal_head *);
|
|
extern void journal_write_revoke_records(journal_t *, transaction_t *);
|
|
|
|
/* Recovery revoke support */
|
|
extern int journal_set_revoke(journal_t *, unsigned long, tid_t);
|
|
extern int journal_test_revoke(journal_t *, unsigned long, tid_t);
|
|
extern void journal_clear_revoke(journal_t *);
|
|
extern void journal_brelse_array(struct buffer_head *b[], int n);
|
|
|
|
/* The log thread user interface:
|
|
*
|
|
* Request space in the current transaction, and force transaction commit
|
|
* transitions on demand.
|
|
*/
|
|
|
|
extern int log_space_left (journal_t *); /* Called with journal locked */
|
|
extern tid_t log_start_commit (journal_t *, transaction_t *);
|
|
extern void log_wait_commit (journal_t *, tid_t);
|
|
extern int log_do_checkpoint (journal_t *, int);
|
|
|
|
extern void log_wait_for_space(journal_t *, int nblocks);
|
|
extern void __journal_drop_transaction(journal_t *, transaction_t *);
|
|
extern int cleanup_journal_tail(journal_t *);
|
|
|
|
/* Reduce journal memory usage by flushing */
|
|
extern void shrink_journal_memory(void);
|
|
|
|
/* Debugging code only: */
|
|
|
|
#define jbd_ENOSYS() \
|
|
do { \
|
|
printk (KERN_ERR "JBD unimplemented function " __FUNCTION__); \
|
|
current->state = TASK_UNINTERRUPTIBLE; \
|
|
schedule(); \
|
|
} while (1)
|
|
|
|
/*
|
|
* is_journal_abort
|
|
*
|
|
* Simple test wrapper function to test the JFS_ABORT state flag. This
|
|
* bit, when set, indicates that we have had a fatal error somewhere,
|
|
* either inside the journaling layer or indicated to us by the client
|
|
* (eg. ext3), and that we and should not commit any further
|
|
* transactions.
|
|
*/
|
|
|
|
static inline int is_journal_aborted(journal_t *journal)
|
|
{
|
|
return journal->j_flags & JFS_ABORT;
|
|
}
|
|
|
|
static inline int is_handle_aborted(handle_t *handle)
|
|
{
|
|
if (handle->h_aborted)
|
|
return 1;
|
|
return is_journal_aborted(handle->h_transaction->t_journal);
|
|
}
|
|
|
|
static inline void journal_abort_handle(handle_t *handle)
|
|
{
|
|
handle->h_aborted = 1;
|
|
}
|
|
|
|
/* Not all architectures define BUG() */
|
|
#ifndef BUG
|
|
#define BUG() do { \
|
|
printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
|
|
* ((char *) 0) = 0; \
|
|
} while (0)
|
|
#endif /* BUG */
|
|
|
|
#else
|
|
|
|
extern int journal_recover (journal_t *journal);
|
|
extern int journal_skip_recovery (journal_t *);
|
|
|
|
/* Primary revoke support */
|
|
extern int journal_init_revoke(journal_t *, int);
|
|
extern void journal_destroy_revoke_caches(void);
|
|
extern int journal_init_revoke_caches(void);
|
|
|
|
/* Recovery revoke support */
|
|
extern int journal_set_revoke(journal_t *, unsigned long, tid_t);
|
|
extern int journal_test_revoke(journal_t *, unsigned long, tid_t);
|
|
extern void journal_clear_revoke(journal_t *);
|
|
extern void journal_brelse_array(struct buffer_head *b[], int n);
|
|
|
|
extern void journal_destroy_revoke(journal_t *);
|
|
#endif /* __KERNEL__ */
|
|
|
|
/* Comparison functions for transaction IDs: perform comparisons using
|
|
* modulo arithmetic so that they work over sequence number wraps. */
|
|
|
|
static inline int tid_gt(tid_t x, tid_t y)
|
|
{
|
|
int difference = (x - y);
|
|
return (difference > 0);
|
|
}
|
|
|
|
static inline int tid_geq(tid_t x, tid_t y)
|
|
{
|
|
int difference = (x - y);
|
|
return (difference >= 0);
|
|
}
|
|
|
|
extern int journal_blocks_per_page(struct inode *inode);
|
|
|
|
/*
|
|
* Definitions which augment the buffer_head layer
|
|
*/
|
|
|
|
/* journaling buffer types */
|
|
#define BJ_None 0 /* Not journaled */
|
|
#define BJ_SyncData 1 /* Normal data: flush before commit */
|
|
#define BJ_AsyncData 2 /* writepage data: wait on it before commit */
|
|
#define BJ_Metadata 3 /* Normal journaled metadata */
|
|
#define BJ_Forget 4 /* Buffer superceded by this transaction */
|
|
#define BJ_IO 5 /* Buffer is for temporary IO use */
|
|
#define BJ_Shadow 6 /* Buffer contents being shadowed to the log */
|
|
#define BJ_LogCtl 7 /* Buffer contains log descriptors */
|
|
#define BJ_Reserved 8 /* Buffer is reserved for access by journal */
|
|
#define BJ_Types 9
|
|
|
|
extern int jbd_blocks_per_page(struct inode *inode);
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
extern spinlock_t jh_splice_lock;
|
|
/*
|
|
* Once `expr1' has been found true, take jh_splice_lock
|
|
* and then reevaluate everything.
|
|
*/
|
|
#define SPLICE_LOCK(expr1, expr2) \
|
|
({ \
|
|
int ret = (expr1); \
|
|
if (ret) { \
|
|
spin_lock(&jh_splice_lock); \
|
|
ret = (expr1) && (expr2); \
|
|
spin_unlock(&jh_splice_lock); \
|
|
} \
|
|
ret; \
|
|
})
|
|
|
|
/*
|
|
* A number of buffer state predicates. They test for
|
|
* buffer_jbd() because they are used in core kernel code.
|
|
*
|
|
* These will be racy on SMP unless we're *sure* that the
|
|
* buffer won't be detached from the journalling system
|
|
* in parallel.
|
|
*/
|
|
|
|
/* Return true if the buffer is on journal list `list' */
|
|
static inline int buffer_jlist_eq(struct buffer_head *bh, int list)
|
|
{
|
|
return SPLICE_LOCK(buffer_jbd(bh), bh2jh(bh)->b_jlist == list);
|
|
}
|
|
|
|
/* Return true if this bufer is dirty wrt the journal */
|
|
static inline int buffer_jdirty(struct buffer_head *bh)
|
|
{
|
|
return buffer_jbd(bh) && __buffer_state(bh, JBDDirty);
|
|
}
|
|
|
|
/* Return true if it's a data buffer which journalling is managing */
|
|
static inline int buffer_jbd_data(struct buffer_head *bh)
|
|
{
|
|
return SPLICE_LOCK(buffer_jbd(bh),
|
|
bh2jh(bh)->b_jlist == BJ_SyncData ||
|
|
bh2jh(bh)->b_jlist == BJ_AsyncData);
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
#define assert_spin_locked(lock) J_ASSERT(spin_is_locked(lock))
|
|
#else
|
|
#define assert_spin_locked(lock) do {} while(0)
|
|
#endif
|
|
|
|
#define buffer_trace_init(bh) do {} while (0)
|
|
#define print_buffer_fields(bh) do {} while (0)
|
|
#define print_buffer_trace(bh) do {} while (0)
|
|
#define BUFFER_TRACE(bh, info) do {} while (0)
|
|
#define BUFFER_TRACE2(bh, bh2, info) do {} while (0)
|
|
#define JBUFFER_TRACE(jh, info) do {} while (0)
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* CONFIG_JBD || CONFIG_JBD_MODULE || !__KERNEL__ */
|
|
|
|
/*
|
|
* Compatibility no-ops which allow the kernel to compile without CONFIG_JBD
|
|
* go here.
|
|
*/
|
|
|
|
#if defined(__KERNEL__) && !(defined(CONFIG_JBD) || defined(CONFIG_JBD_MODULE))
|
|
|
|
#define J_ASSERT(expr) do {} while (0)
|
|
#define J_ASSERT_BH(bh, expr) do {} while (0)
|
|
#define buffer_jbd(bh) 0
|
|
#define buffer_jlist_eq(bh, val) 0
|
|
#define journal_buffer_journal_lru(bh) 0
|
|
|
|
#endif /* defined(__KERNEL__) && !defined(CONFIG_JBD) */
|
|
#endif /* _LINUX_JBD_H */
|