Edit File: gfs2_ondisk.h
/* * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. * Copyright (C) 2004-2006 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__ #include <linux/types.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 #define GFS2_CONTROL_LOCK 4 #define GFS2_MOUNTED_LOCK 5 /* 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 1600 #define GFS2_FORMAT_ED 1700 #define GFS2_FORMAT_QC 1400 /* These are format numbers for entities contained in files */ #define GFS2_FORMAT_RI 1100 #define GFS2_FORMAT_DE 1200 #define GFS2_FORMAT_QU 1500 /* These are part of the superblock */ #define GFS2_FORMAT_FS 1801 #define GFS2_FORMAT_MULTI 1900 /* * An on-disk inode number */ 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 12 #define GFS2_METATYPE_EA 10 #define GFS2_METATYPE_ED 11 #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; /* This union is to keep userspace happy */ union { __be32 mh_jid; /* Was incarnation number in gfs1 */ __be32 __pad1; }; }; /* * 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]; struct gfs2_inum __pad3; /* Was quota inode in gfs1 */ struct gfs2_inum __pad4; /* Was licence inode in gfs1 */ #define GFS2_HAS_UUID 1 __u8 sb_uuid[16]; /* The UUID, maybe 0 for backwards compat */ }; /* * 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_UNLINKED 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 #define GFS2_RGF_TRIMMED 0x00000010 struct gfs2_rgrp_lvb { __be32 rl_magic; __be32 rl_flags; __be32 rl_free; __be32 rl_dinodes; __be64 rl_igeneration; __be32 rl_unlinked; __be32 __pad; }; struct gfs2_rgrp { struct gfs2_meta_header rg_header; __be32 rg_flags; __be32 rg_free; __be32 rg_dinodes; __be32 __pad; __be64 rg_igeneration; __u8 rg_reserved[80]; /* Several fields from gfs1 now reserved */ }; /* * quota structure */ struct gfs2_quota { __be64 qu_limit; __be64 qu_warn; __be64 qu_value; __u8 qu_reserved[64]; }; /* * 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) enum { gfs2fl_Jdata = 0, gfs2fl_ExHash = 1, gfs2fl_Unused = 2, gfs2fl_EaIndirect = 3, gfs2fl_Directio = 4, gfs2fl_Immutable = 5, gfs2fl_AppendOnly = 6, gfs2fl_NoAtime = 7, gfs2fl_Sync = 8, gfs2fl_System = 9, gfs2fl_TopLevel = 10, gfs2fl_TruncInProg = 29, gfs2fl_InheritDirectio = 30, gfs2fl_InheritJdata = 31, }; /* 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_TOPDIR 0x00000400 /* New in gfs2 */ #define GFS2_DIF_TRUNC_IN_PROG 0x20000000 /* New in gfs2 */ #define GFS2_DIF_INHERIT_DIRECTIO 0x40000000 /* only in gfs1 */ #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 */ __be64 di_generation; /* generation number for NFS */ __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 */ __be32 di_atime_nsec; /* nsec portion of atime */ __be32 di_mtime_nsec; /* nsec portion of mtime */ __be32 di_ctime_nsec; /* nsec portion of ctime */ __u8 di_reserved[44]; }; /* * 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) #define GFS2_MIN_DIRENT_SIZE (GFS2_DIRENT_SIZE(1)) struct gfs2_dirent { struct gfs2_inum de_inum; __be32 de_hash; __be16 de_rec_len; __be16 de_name_len; __be16 de_type; __be16 de_rahead; union { __u8 __pad[12]; struct { __u32 de_cookie; /* ondisk value not used */ __u8 pad3[8]; }; }; }; /* * 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 */ union { __u8 lf_reserved[64]; struct { __be64 lf_inode; /* Dir inode number */ __be32 lf_dist; /* Dist from inode on chain */ __be32 lf_nsec; /* Last ins/del nsecs */ __be64 lf_sec; /* Last ins/del in secs */ __u8 lf_reserved2[40]; }; }; }; /* * Extended attribute header format * * This works in a similar way to dirents. There is a fixed size header * followed by a variable length section made up of the name and the * associated data. In the case of a "stuffed" entry, the value is * __inline__ directly after the name, the ea_num_ptrs entry will be * zero in that case. For non-"stuffed" entries, there will be * a set of pointers (aligned to 8 byte boundary) to the block(s) * containing the value. * * The blocks containing the values and the blocks containing the * extended attribute headers themselves all start with the common * metadata header. Each inode, if it has extended attributes, will * have either a single block containing the extended attribute headers * or a single indirect block pointing to blocks containing the * extended attribure headers. * * The maximim size of the data part of an extended attribute is 64k * so the number of blocks required depends upon block size. Since the * block size also determines the number of pointers in an indirect * block, its a fairly complicated calculation to work out the maximum * number of blocks that an inode may have relating to extended attributes. * */ #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_SECURITY 3 #define GFS2_EATYPE_LAST 3 #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. */ #define GFS2_LOG_DESC_JDATA 302 /* ld_data1 is the number of data 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; }; /* * 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; }; struct gfs2_quota_lvb { __be32 qb_magic; __u32 __pad; __be64 qb_limit; /* Hard limit of # blocks to alloc */ __be64 qb_warn; /* Warn user when alloc is above this # */ __be64 qb_value; /* Current # blocks allocated */ }; #endif /* __GFS2_ONDISK_DOT_H__ */