[GFS2] The core of GFS2

This patch contains all the core files for GFS2.

Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 454 insertions, 0 deletions

diff --git a/include/linux/gfs2_ondisk.h b/include/linux/gfs2_ondisk.h
new file mode 100644
index 000000000000..213d664d495d
--- /dev/null
+++ b/include/linux/gfs2_ondisk.h
@@ -0,0 +1,454 @@
+/*
+ * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
+ * Copyright (C) 2004-2005 Red Hat, Inc.  All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License v.2.
+ */
+
+#ifndef __GFS2_ONDISK_DOT_H__
+#define __GFS2_ONDISK_DOT_H__
+
+#define GFS2_MAGIC		0x01161970
+#define GFS2_BASIC_BLOCK	512
+#define GFS2_BASIC_BLOCK_SHIFT	9
+
+/* Lock numbers of the LM_TYPE_NONDISK type */
+
+#define GFS2_MOUNT_LOCK		0
+#define GFS2_LIVE_LOCK		1
+#define GFS2_TRANS_LOCK		2
+#define GFS2_RENAME_LOCK	3
+
+/* Format numbers for various metadata types */
+
+#define GFS2_FORMAT_NONE	0
+#define GFS2_FORMAT_SB		100
+#define GFS2_FORMAT_RG		200
+#define GFS2_FORMAT_RB		300
+#define GFS2_FORMAT_DI		400
+#define GFS2_FORMAT_IN		500
+#define GFS2_FORMAT_LF		600
+#define GFS2_FORMAT_JD		700
+#define GFS2_FORMAT_LH		800
+#define GFS2_FORMAT_LD		900
+#define GFS2_FORMAT_LB		1000
+#define GFS2_FORMAT_EA		1100
+#define GFS2_FORMAT_ED		1200
+#define GFS2_FORMAT_UT		1300
+#define GFS2_FORMAT_QC		1400
+/* These are format numbers for entities contained in files */
+#define GFS2_FORMAT_RI		1500
+#define GFS2_FORMAT_DE		1600
+#define GFS2_FORMAT_QU		1700
+/* These are part of the superblock */
+#define GFS2_FORMAT_FS		1801
+#define GFS2_FORMAT_MULTI	1900
+
+/*
+ * An on-disk inode number
+ */
+
+#define gfs2_inum_equal(ino1, ino2) \
+	(((ino1)->no_formal_ino == (ino2)->no_formal_ino) && \
+	((ino1)->no_addr == (ino2)->no_addr))
+
+struct gfs2_inum {
+	__be64 no_formal_ino;
+	__be64 no_addr;
+};
+
+/*
+ * Generic metadata head structure
+ * Every inplace buffer logged in the journal must start with this.
+ */
+
+#define GFS2_METATYPE_NONE	0
+#define GFS2_METATYPE_SB	1
+#define GFS2_METATYPE_RG	2
+#define GFS2_METATYPE_RB	3
+#define GFS2_METATYPE_DI	4
+#define GFS2_METATYPE_IN	5
+#define GFS2_METATYPE_LF	6
+#define GFS2_METATYPE_JD	7
+#define GFS2_METATYPE_LH	8
+#define GFS2_METATYPE_LD	9
+#define GFS2_METATYPE_LB	10
+#define GFS2_METATYPE_EA	11
+#define GFS2_METATYPE_ED	12
+#define GFS2_METATYPE_UT	13
+#define GFS2_METATYPE_QC	14
+
+struct gfs2_meta_header {
+	__be32 mh_magic;
+	__be32 mh_type;
+	__be64 __pad0;		/* Was generation number in gfs1 */
+	__be32 mh_format;
+	__be32 __pad1;		/* Was incarnation number in gfs1 */
+};
+
+/*
+ * super-block structure
+ *
+ * It's probably good if SIZEOF_SB <= GFS2_BASIC_BLOCK (512 bytes)
+ *
+ * Order is important, need to be able to read old superblocks to do on-disk
+ * version upgrades.
+ */
+
+/* Address of superblock in GFS2 basic blocks */
+#define GFS2_SB_ADDR		128
+
+/* The lock number for the superblock (must be zero) */
+#define GFS2_SB_LOCK		0
+
+/* Requirement:  GFS2_LOCKNAME_LEN % 8 == 0
+   Includes: the fencing zero at the end */
+#define GFS2_LOCKNAME_LEN	64
+
+struct gfs2_sb {
+	struct gfs2_meta_header sb_header;
+
+	__be32 sb_fs_format;
+	__be32 sb_multihost_format;
+	__u32  __pad0;	/* Was superblock flags in gfs1 */
+
+	__be32 sb_bsize;
+	__be32 sb_bsize_shift;
+	__u32 __pad1;	/* Was journal segment size in gfs1 */
+
+	struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */
+	struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */
+	struct gfs2_inum sb_root_dir;
+
+	char sb_lockproto[GFS2_LOCKNAME_LEN];
+	char sb_locktable[GFS2_LOCKNAME_LEN];
+	/* In gfs1, quota and license dinodes followed */
+};
+
+/*
+ * resource index structure
+ */
+
+struct gfs2_rindex {
+	__be64 ri_addr;	/* grp block disk address */
+	__be32 ri_length;	/* length of rgrp header in fs blocks */
+	__u32 __pad;
+
+	__be64 ri_data0;	/* first data location */
+	__be32 ri_data;	/* num of data blocks in rgrp */
+
+	__be32 ri_bitbytes;	/* number of bytes in data bitmaps */
+
+	__u8 ri_reserved[64];
+};
+
+/*
+ * resource group header structure
+ */
+
+/* Number of blocks per byte in rgrp */
+#define GFS2_NBBY		4
+#define GFS2_BIT_SIZE		2
+#define GFS2_BIT_MASK		0x00000003
+
+#define GFS2_BLKST_FREE		0
+#define GFS2_BLKST_USED		1
+#define GFS2_BLKST_INVALID	2
+#define GFS2_BLKST_DINODE	3
+
+#define GFS2_RGF_JOURNAL	0x00000001
+#define GFS2_RGF_METAONLY	0x00000002
+#define GFS2_RGF_DATAONLY	0x00000004
+#define GFS2_RGF_NOALLOC	0x00000008
+
+struct gfs2_rgrp {
+	struct gfs2_meta_header rg_header;
+
+	__be32 rg_flags;
+	__be32 rg_free;
+	__be32 rg_dinodes;
+
+	__u8 rg_reserved[92]; /* Several fields from gfs1 now reserved */
+};
+
+/*
+ * quota structure
+ */
+
+struct gfs2_quota {
+	__be64 qu_limit;
+	__be64 qu_warn;
+	__be64 qu_value;
+};
+
+/*
+ * dinode structure
+ */
+
+#define GFS2_MAX_META_HEIGHT	10
+#define GFS2_DIR_MAX_DEPTH	17
+
+#define DT2IF(dt) (((dt) << 12) & S_IFMT)
+#define IF2DT(sif) (((sif) & S_IFMT) >> 12)
+
+/* Dinode flags */
+#define GFS2_DIF_JDATA			0x00000001
+#define GFS2_DIF_EXHASH			0x00000002
+#define GFS2_DIF_UNUSED			0x00000004  /* only in gfs1 */
+#define GFS2_DIF_EA_INDIRECT		0x00000008
+#define GFS2_DIF_DIRECTIO		0x00000010
+#define GFS2_DIF_IMMUTABLE		0x00000020
+#define GFS2_DIF_APPENDONLY		0x00000040
+#define GFS2_DIF_NOATIME		0x00000080
+#define GFS2_DIF_SYNC			0x00000100
+#define GFS2_DIF_SYSTEM			0x00000200 /* New in gfs2 */
+#define GFS2_DIF_TRUNC_IN_PROG		0x20000000 /* New in gfs2 */
+#define GFS2_DIF_INHERIT_DIRECTIO	0x40000000
+#define GFS2_DIF_INHERIT_JDATA		0x80000000
+
+struct gfs2_dinode {
+	struct gfs2_meta_header di_header;
+
+	struct gfs2_inum di_num;
+
+	__be32 di_mode;	/* mode of file */
+	__be32 di_uid;	/* owner's user id */
+	__be32 di_gid;	/* owner's group id */
+	__be32 di_nlink;	/* number of links to this file */
+	__be64 di_size;	/* number of bytes in file */
+	__be64 di_blocks;	/* number of blocks in file */
+	__be64 di_atime;	/* time last accessed */
+	__be64 di_mtime;	/* time last modified */
+	__be64 di_ctime;	/* time last changed */
+	__be32 di_major;	/* device major number */
+	__be32 di_minor;	/* device minor number */
+
+	/* This section varies from gfs1. Padding added to align with
+         * remainder of dinode
+	 */
+	__be64 di_goal_meta;	/* rgrp to alloc from next */
+	__be64 di_goal_data;	/* data block goal */
+	__u32 __pad[2];
+
+	__be32 di_flags;	/* GFS2_DIF_... */
+	__be32 di_payload_format;  /* GFS2_FORMAT_... */
+	__u16 __pad1;	/* Was ditype in gfs1 */
+	__be16 di_height;	/* height of metadata */
+	__u32 __pad2;	/* Unused incarnation number from gfs1 */
+
+	/* These only apply to directories  */
+	__u16 __pad3;	/* Padding */
+	__be16 di_depth;	/* Number of bits in the table */
+	__be32 di_entries;	/* The number of entries in the directory */
+
+	struct gfs2_inum __pad4; /* Unused even in current gfs1 */
+
+	__be64 di_eattr;	/* extended attribute block number */
+
+	__u8 di_reserved[56];
+};
+
+/*
+ * directory structure - many of these per directory file
+ */
+
+#define GFS2_FNAMESIZE		255
+#define GFS2_DIRENT_SIZE(name_len) ((sizeof(struct gfs2_dirent) + (name_len) + 7) & ~7)
+
+struct gfs2_dirent {
+	struct gfs2_inum de_inum;
+	__be32 de_hash;
+	__be32 de_rec_len;
+	__u8 de_name_len;
+	__u8 de_type;
+	__u16 __pad1;
+	__u32 __pad2;
+};
+
+/*
+ * Header of leaf directory nodes
+ */
+
+struct gfs2_leaf {
+	struct gfs2_meta_header lf_header;
+
+	__be16 lf_depth;		/* Depth of leaf */
+	__be16 lf_entries;		/* Number of dirents in leaf */
+	__be32 lf_dirent_format;	/* Format of the dirents */
+	__be64 lf_next;			/* Next leaf, if overflow */
+
+	__u8 lf_reserved[32];
+};
+
+/*
+ * Extended attribute header format
+ */
+
+#define GFS2_EA_MAX_NAME_LEN	255
+#define GFS2_EA_MAX_DATA_LEN	65536
+
+#define GFS2_EATYPE_UNUSED	0
+#define GFS2_EATYPE_USR		1
+#define GFS2_EATYPE_SYS		2
+
+#define GFS2_EATYPE_LAST	2
+#define GFS2_EATYPE_VALID(x)	((x) <= GFS2_EATYPE_LAST)
+
+#define GFS2_EAFLAG_LAST	0x01	/* last ea in block */
+
+struct gfs2_ea_header {
+	__be32 ea_rec_len;
+	__be32 ea_data_len;
+	__u8 ea_name_len;	/* no NULL pointer after the string */
+	__u8 ea_type;		/* GFS2_EATYPE_... */
+	__u8 ea_flags;		/* GFS2_EAFLAG_... */
+	__u8 ea_num_ptrs;
+	__u32 __pad;
+};
+
+/*
+ * Log header structure
+ */
+
+#define GFS2_LOG_HEAD_UNMOUNT	0x00000001	/* log is clean */
+
+struct gfs2_log_header {
+	struct gfs2_meta_header lh_header;
+
+	__be64 lh_sequence;	/* Sequence number of this transaction */
+	__be32 lh_flags;	/* GFS2_LOG_HEAD_... */
+	__be32 lh_tail;		/* Block number of log tail */
+	__be32 lh_blkno;
+	__be32 lh_hash;
+};
+
+/*
+ * Log type descriptor
+ */
+
+#define GFS2_LOG_DESC_METADATA	300
+/* ld_data1 is the number of metadata blocks in the descriptor.
+   ld_data2 is unused. */
+
+#define GFS2_LOG_DESC_REVOKE	301
+/* ld_data1 is the number of revoke blocks in the descriptor.
+   ld_data2 is unused. */
+
+struct gfs2_log_descriptor {
+	struct gfs2_meta_header ld_header;
+
+	__be32 ld_type;		/* GFS2_LOG_DESC_... */
+	__be32 ld_length;	/* Number of buffers in this chunk */
+	__be32 ld_data1;	/* descriptor-specific field */
+	__be32 ld_data2;	/* descriptor-specific field */
+
+	__u8 ld_reserved[32];
+};
+
+/*
+ * Inum Range
+ * Describe a range of formal inode numbers allocated to
+ * one machine to assign to inodes.
+ */
+
+#define GFS2_INUM_QUANTUM	1048576
+
+struct gfs2_inum_range {
+	__be64 ir_start;
+	__be64 ir_length;
+};
+
+/*
+ * Statfs change
+ * Describes an change to the pool of free and allocated
+ * blocks.
+ */
+
+struct gfs2_statfs_change {
+	__be64 sc_total;
+	__be64 sc_free;
+	__be64 sc_dinodes;
+};
+
+/*
+ * Unlinked Tag
+ * Describes an allocated inode that isn't linked into
+ * the directory tree and might need to be deallocated.
+ */
+
+#define GFS2_UTF_UNINIT		0x00000001
+
+struct gfs2_unlinked_tag {
+	struct gfs2_inum ut_inum;
+	__be32 ut_flags;	/* GFS2_UTF_... */
+	__u32 __pad;
+};
+
+/*
+ * Quota change
+ * Describes an allocation change for a particular
+ * user or group.
+ */
+
+#define GFS2_QCF_USER		0x00000001
+
+struct gfs2_quota_change {
+	__be64 qc_change;
+	__be32 qc_flags;	/* GFS2_QCF_... */
+	__be32 qc_id;
+};
+
+/* Translation functions */
+
+extern void gfs2_inum_in(struct gfs2_inum *no, char *buf);
+extern void gfs2_inum_out(struct gfs2_inum *no, char *buf);
+extern void gfs2_meta_header_in(struct gfs2_meta_header *mh, char *buf);
+extern void gfs2_meta_header_out(struct gfs2_meta_header *mh, char *buf);
+extern void gfs2_sb_in(struct gfs2_sb *sb, char *buf);
+extern void gfs2_sb_out(struct gfs2_sb *sb, char *buf);
+extern void gfs2_rindex_in(struct gfs2_rindex *ri, char *buf);
+extern void gfs2_rindex_out(struct gfs2_rindex *ri, char *buf);
+extern void gfs2_rgrp_in(struct gfs2_rgrp *rg, char *buf);
+extern void gfs2_rgrp_out(struct gfs2_rgrp *rg, char *buf);
+extern void gfs2_quota_in(struct gfs2_quota *qu, char *buf);
+extern void gfs2_quota_out(struct gfs2_quota *qu, char *buf);
+extern void gfs2_dinode_in(struct gfs2_dinode *di, char *buf);
+extern void gfs2_dinode_out(struct gfs2_dinode *di, char *buf);
+extern void gfs2_dirent_in(struct gfs2_dirent *de, char *buf);
+extern void gfs2_dirent_out(struct gfs2_dirent *de, char *buf);
+extern void gfs2_leaf_in(struct gfs2_leaf *lf, char *buf);
+extern void gfs2_leaf_out(struct gfs2_leaf *lf, char *buf);
+extern void gfs2_ea_header_in(struct gfs2_ea_header *ea, char *buf);
+extern void gfs2_ea_header_out(struct gfs2_ea_header *ea, char *buf);
+extern void gfs2_log_header_in(struct gfs2_log_header *lh, char *buf);
+extern void gfs2_inum_range_in(struct gfs2_inum_range *ir, char *buf);
+extern void gfs2_inum_range_out(struct gfs2_inum_range *ir, char *buf);
+extern void gfs2_statfs_change_in(struct gfs2_statfs_change *sc, char *buf);
+extern void gfs2_statfs_change_out(struct gfs2_statfs_change *sc, char *buf);
+extern void gfs2_unlinked_tag_in(struct gfs2_unlinked_tag *ut, char *buf);
+extern void gfs2_unlinked_tag_out(struct gfs2_unlinked_tag *ut, char *buf);
+extern void gfs2_quota_change_in(struct gfs2_quota_change *qc, char *buf);
+extern void gfs2_quota_change_out(struct gfs2_quota_change *qc, char *buf);
+
+/* Printing functions */
+
+extern void gfs2_inum_print(struct gfs2_inum *no);
+extern void gfs2_meta_header_print(struct gfs2_meta_header *mh);
+extern void gfs2_sb_print(struct gfs2_sb *sb);
+extern void gfs2_rindex_print(struct gfs2_rindex *ri);
+extern void gfs2_rgrp_print(struct gfs2_rgrp *rg);
+extern void gfs2_quota_print(struct gfs2_quota *qu);
+extern void gfs2_dinode_print(struct gfs2_dinode *di);
+extern void gfs2_dirent_print(struct gfs2_dirent *de, char *name);
+extern void gfs2_leaf_print(struct gfs2_leaf *lf);
+extern void gfs2_ea_header_print(struct gfs2_ea_header *ea, char *name);
+extern void gfs2_log_header_print(struct gfs2_log_header *lh);
+extern void gfs2_log_descriptor_print(struct gfs2_log_descriptor *ld);
+extern void gfs2_inum_range_print(struct gfs2_inum_range *ir);
+extern void gfs2_statfs_change_print(struct gfs2_statfs_change *sc);
+extern void gfs2_unlinked_tag_print(struct gfs2_unlinked_tag *ut);
+extern void gfs2_quota_change_print(struct gfs2_quota_change *qc);
+
+#endif /* __GFS2_ONDISK_DOT_H__ */