summaryrefslogtreecommitdiff
path: root/e2fsprogs/old_e2fsprogs/ext2fs/kernel-jbd.h
diff options
context:
space:
mode:
authorDenis Vlasenko2006-12-26 01:30:59 +0000
committerDenis Vlasenko2006-12-26 01:30:59 +0000
commitc4f623ef2a7980a63de7c9f1d539a656b83f10e7 (patch)
treea294e28b0112052cb9d58b403554b3390e76f50c /e2fsprogs/old_e2fsprogs/ext2fs/kernel-jbd.h
parent64c54025842f205ad722675105b88044a5b6845a (diff)
downloadbusybox-c4f623ef2a7980a63de7c9f1d539a656b83f10e7.zip
busybox-c4f623ef2a7980a63de7c9f1d539a656b83f10e7.tar.gz
put small subset of e2fsprogs back in the tree:
lsattr, chattr, fsck. Old e2fsprogs tree is in e2fsprogs/old_e2fsprogs/*.
Diffstat (limited to 'e2fsprogs/old_e2fsprogs/ext2fs/kernel-jbd.h')
-rw-r--r--e2fsprogs/old_e2fsprogs/ext2fs/kernel-jbd.h236
1 files changed, 236 insertions, 0 deletions
diff --git a/e2fsprogs/old_e2fsprogs/ext2fs/kernel-jbd.h b/e2fsprogs/old_e2fsprogs/ext2fs/kernel-jbd.h
new file mode 100644
index 0000000..4c6c7de
--- /dev/null
+++ b/e2fsprogs/old_e2fsprogs/ext2fs/kernel-jbd.h
@@ -0,0 +1,236 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * linux/include/linux/jbd.h
+ *
+ * Written by Stephen C. Tweedie <sct@redhat.com>
+ *
+ * Copyright 1998-2000 Red Hat, Inc --- All Rights Reserved
+ *
+ * This file is part of the Linux kernel and is made available under
+ * the terms of the GNU General Public License, version 2, or at your
+ * option, any later version, incorporated herein by reference.
+ *
+ * Definitions for transaction data structures for the buffer cache
+ * filesystem journaling support.
+ */
+
+#ifndef _LINUX_JBD_H
+#define _LINUX_JBD_H
+
+#include <sys/types.h>
+#include <linux/types.h>
+#include "ext2fs.h"
+
+/*
+ * Standard header for all descriptor blocks:
+ */
+
+typedef struct journal_header_s
+{
+ __u32 h_magic;
+ __u32 h_blocktype;
+ __u32 h_sequence;
+} journal_header_t;
+
+/*
+ * This is the global e2fsck structure.
+ */
+typedef struct e2fsck_struct *e2fsck_t;
+
+
+struct inode {
+ e2fsck_t i_ctx;
+ ext2_ino_t i_ino;
+ struct ext2_inode i_ext2;
+};
+
+
+/*
+ * The journal superblock. All fields are in big-endian byte order.
+ */
+typedef struct journal_superblock_s
+{
+/* 0x0000 */
+ journal_header_t s_header;
+
+/* 0x000C */
+ /* Static information describing the journal */
+ __u32 s_blocksize; /* journal device blocksize */
+ __u32 s_maxlen; /* total blocks in journal file */
+ __u32 s_first; /* first block of log information */
+
+/* 0x0018 */
+ /* Dynamic information describing the current state of the log */
+ __u32 s_sequence; /* first commit ID expected in log */
+ __u32 s_start; /* blocknr of start of log */
+
+/* 0x0020 */
+ /* Error value, as set by journal_abort(). */
+ __s32 s_errno;
+
+/* 0x0024 */
+ /* Remaining fields are only valid in a version-2 superblock */
+ __u32 s_feature_compat; /* compatible feature set */
+ __u32 s_feature_incompat; /* incompatible feature set */
+ __u32 s_feature_ro_compat; /* readonly-compatible feature set */
+/* 0x0030 */
+ __u8 s_uuid[16]; /* 128-bit uuid for journal */
+
+/* 0x0040 */
+ __u32 s_nr_users; /* Nr of filesystems sharing log */
+
+ __u32 s_dynsuper; /* Blocknr of dynamic superblock copy*/
+
+/* 0x0048 */
+ __u32 s_max_transaction; /* Limit of journal blocks per trans.*/
+ __u32 s_max_trans_data; /* Limit of data blocks per trans. */
+
+/* 0x0050 */
+ __u32 s_padding[44];
+
+/* 0x0100 */
+ __u8 s_users[16*48]; /* ids of all fs'es sharing the log */
+/* 0x0400 */
+} journal_superblock_t;
+
+
+extern int journal_blocks_per_page(struct inode *inode);
+extern int jbd_blocks_per_page(struct inode *inode);
+
+#define JFS_MIN_JOURNAL_BLOCKS 1024
+
+
+/*
+ * Internal structures used by the logging mechanism:
+ */
+
+#define JFS_MAGIC_NUMBER 0xc03b3998U /* The first 4 bytes of /dev/random! */
+
+/*
+ * Descriptor block types:
+ */
+
+#define JFS_DESCRIPTOR_BLOCK 1
+#define JFS_COMMIT_BLOCK 2
+#define JFS_SUPERBLOCK_V1 3
+#define JFS_SUPERBLOCK_V2 4
+#define JFS_REVOKE_BLOCK 5
+
+/*
+ * The block tag: used to describe a single buffer in the journal
+ */
+typedef struct journal_block_tag_s
+{
+ __u32 t_blocknr; /* The on-disk block number */
+ __u32 t_flags; /* See below */
+} journal_block_tag_t;
+
+/*
+ * The revoke descriptor: used on disk to describe a series of blocks to
+ * be revoked from the log
+ */
+typedef struct journal_revoke_header_s
+{
+ journal_header_t r_header;
+ int r_count; /* Count of bytes used in the block */
+} journal_revoke_header_t;
+
+
+/* Definitions for the journal tag flags word: */
+#define JFS_FLAG_ESCAPE 1 /* on-disk block is escaped */
+#define JFS_FLAG_SAME_UUID 2 /* block has same uuid as previous */
+#define JFS_FLAG_DELETED 4 /* block deleted by this transaction */
+#define JFS_FLAG_LAST_TAG 8 /* last tag in this descriptor block */
+
+
+
+
+#define JFS_HAS_COMPAT_FEATURE(j,mask) \
+ ((j)->j_format_version >= 2 && \
+ ((j)->j_superblock->s_feature_compat & cpu_to_be32((mask))))
+#define JFS_HAS_RO_COMPAT_FEATURE(j,mask) \
+ ((j)->j_format_version >= 2 && \
+ ((j)->j_superblock->s_feature_ro_compat & cpu_to_be32((mask))))
+#define JFS_HAS_INCOMPAT_FEATURE(j,mask) \
+ ((j)->j_format_version >= 2 && \
+ ((j)->j_superblock->s_feature_incompat & cpu_to_be32((mask))))
+
+#define JFS_FEATURE_INCOMPAT_REVOKE 0x00000001
+
+/* Features known to this kernel version: */
+#define JFS_KNOWN_COMPAT_FEATURES 0
+#define JFS_KNOWN_ROCOMPAT_FEATURES 0
+#define JFS_KNOWN_INCOMPAT_FEATURES JFS_FEATURE_INCOMPAT_REVOKE
+
+/* Comparison functions for transaction IDs: perform comparisons using
+ * modulo arithmetic so that they work over sequence number wraps. */
+
+
+/*
+ * 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
+
+
+struct kdev_s {
+ e2fsck_t k_ctx;
+ int k_dev;
+};
+
+typedef struct kdev_s *kdev_t;
+typedef unsigned int tid_t;
+
+struct journal_s
+{
+ unsigned long j_flags;
+ int j_errno;
+ struct buffer_head * j_sb_buffer;
+ struct journal_superblock_s *j_superblock;
+ int j_format_version;
+ unsigned long j_head;
+ unsigned long j_tail;
+ unsigned long j_free;
+ unsigned long j_first, j_last;
+ kdev_t j_dev;
+ kdev_t j_fs_dev;
+ int j_blocksize;
+ unsigned int j_blk_offset;
+ unsigned int j_maxlen;
+ struct inode * j_inode;
+ tid_t j_tail_sequence;
+ tid_t j_transaction_sequence;
+ __u8 j_uuid[16];
+ struct jbd_revoke_table_s *j_revoke;
+};
+
+typedef struct journal_s journal_t;
+
+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 /* _LINUX_JBD_H */