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nilfs2_ondisk.h
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/* SPDX-License-Identifier: LGPL-2.1+ WITH Linux-syscall-note */ /* * nilfs2_ondisk.h - NILFS2 on-disk structures * * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published * by the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. */ /* * linux/include/linux/ext2_fs.h * * Copyright (C) 1992, 1993, 1994, 1995 * Remy Card (card@masi.ibp.fr) * Laboratoire MASI - Institut Blaise Pascal * Universite Pierre et Marie Curie (Paris VI) * * from * * linux/include/linux/minix_fs.h * * Copyright (C) 1991, 1992 Linus Torvalds */ #ifndef _LINUX_NILFS2_ONDISK_H #define _LINUX_NILFS2_ONDISK_H #include <linux/types.h> #include <linux/magic.h> #include <asm/byteorder.h> #define NILFS_INODE_BMAP_SIZE 7 /** * struct nilfs_inode - structure of an inode on disk * @i_blocks: blocks count * @i_size: size in bytes * @i_ctime: creation time (seconds) * @i_mtime: modification time (seconds) * @i_ctime_nsec: creation time (nano seconds) * @i_mtime_nsec: modification time (nano seconds) * @i_uid: user id * @i_gid: group id * @i_mode: file mode * @i_links_count: links count * @i_flags: file flags * @i_bmap: block mapping * @i_xattr: extended attributes * @i_generation: file generation (for NFS) * @i_pad: padding */ struct nilfs_inode { __le64 i_blocks; __le64 i_size; __le64 i_ctime; __le64 i_mtime; __le32 i_ctime_nsec; __le32 i_mtime_nsec; __le32 i_uid; __le32 i_gid; __le16 i_mode; __le16 i_links_count; __le32 i_flags; __le64 i_bmap[NILFS_INODE_BMAP_SIZE]; #define i_device_code i_bmap[0] __le64 i_xattr; __le32 i_generation; __le32 i_pad; }; #define NILFS_MIN_INODE_SIZE 128 /** * struct nilfs_super_root - structure of super root * @sr_sum: check sum * @sr_bytes: byte count of the structure * @sr_flags: flags (reserved) * @sr_nongc_ctime: write time of the last segment not for cleaner operation * @sr_dat: DAT file inode * @sr_cpfile: checkpoint file inode * @sr_sufile: segment usage file inode */ struct nilfs_super_root { __le32 sr_sum; __le16 sr_bytes; __le16 sr_flags; __le64 sr_nongc_ctime; struct nilfs_inode sr_dat; struct nilfs_inode sr_cpfile; struct nilfs_inode sr_sufile; }; #define NILFS_SR_MDT_OFFSET(inode_size, i) \ ((unsigned long)&((struct nilfs_super_root *)0)->sr_dat + \ (inode_size) * (i)) #define NILFS_SR_DAT_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 0) #define NILFS_SR_CPFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 1) #define NILFS_SR_SUFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 2) #define NILFS_SR_BYTES(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 3) /* * Maximal mount counts */ #define NILFS_DFL_MAX_MNT_COUNT 50 /* 50 mounts */ /* * File system states (sbp->s_state, nilfs->ns_mount_state) */ #define NILFS_VALID_FS 0x0001 /* Unmounted cleanly */ #define NILFS_ERROR_FS 0x0002 /* Errors detected */ #define NILFS_RESIZE_FS 0x0004 /* Resize required */ /* * Mount flags (sbi->s_mount_opt) */ #define NILFS_MOUNT_ERROR_MODE 0x0070 /* Error mode mask */ #define NILFS_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ #define NILFS_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ #define NILFS_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ #define NILFS_MOUNT_BARRIER 0x1000 /* Use block barriers */ #define NILFS_MOUNT_STRICT_ORDER 0x2000 /* * Apply strict in-order * semantics also for data */ #define NILFS_MOUNT_NORECOVERY 0x4000 /* * Disable write access during * mount-time recovery */ #define NILFS_MOUNT_DISCARD 0x8000 /* Issue DISCARD requests */ /** * struct nilfs_super_block - structure of super block on disk */ struct nilfs_super_block { /*00*/ __le32 s_rev_level; /* Revision level */ __le16 s_minor_rev_level; /* minor revision level */ __le16 s_magic; /* Magic signature */ __le16 s_bytes; /* * Bytes count of CRC calculation * for this structure. s_reserved * is excluded. */ __le16 s_flags; /* flags */ __le32 s_crc_seed; /* Seed value of CRC calculation */ /*10*/ __le32 s_sum; /* Check sum of super block */ __le32 s_log_block_size; /* * Block size represented as follows * blocksize = * 1 << (s_log_block_size + 10) */ __le64 s_nsegments; /* Number of segments in filesystem */ /*20*/ __le64 s_dev_size; /* block device size in bytes */ __le64 s_first_data_block; /* 1st seg disk block number */ /*30*/ __le32 s_blocks_per_segment; /* number of blocks per full segment */ __le32 s_r_segments_percentage; /* Reserved segments percentage */ __le64 s_last_cno; /* Last checkpoint number */ /*40*/ __le64 s_last_pseg; /* disk block addr pseg written last */ __le64 s_last_seq; /* seq. number of seg written last */ /*50*/ __le64 s_free_blocks_count; /* Free blocks count */ __le64 s_ctime; /* * Creation time (execution time of * newfs) */ /*60*/ __le64 s_mtime; /* Mount time */ __le64 s_wtime; /* Write time */ /*70*/ __le16 s_mnt_count; /* Mount count */ __le16 s_max_mnt_count; /* Maximal mount count */ __le16 s_state; /* File system state */ __le16 s_errors; /* Behaviour when detecting errors */ __le64 s_lastcheck; /* time of last check */ /*80*/ __le32 s_checkinterval; /* max. time between checks */ __le32 s_creator_os; /* OS */ __le16 s_def_resuid; /* Default uid for reserved blocks */ __le16 s_def_resgid; /* Default gid for reserved blocks */ __le32 s_first_ino; /* First non-reserved inode */ /*90*/ __le16 s_inode_size; /* Size of an inode */ __le16 s_dat_entry_size; /* Size of a dat entry */ __le16 s_checkpoint_size; /* Size of a checkpoint */ __le16 s_segment_usage_size; /* Size of a segment usage */ /*98*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ /*A8*/ char s_volume_name[80]; /* volume name */ /*F8*/ __le32 s_c_interval; /* Commit interval of segment */ __le32 s_c_block_max; /* * Threshold of data amount for * the segment construction */ /*100*/ __le64 s_feature_compat; /* Compatible feature set */ __le64 s_feature_compat_ro; /* Read-only compatible feature set */ __le64 s_feature_incompat; /* Incompatible feature set */ __u32 s_reserved[186]; /* padding to the end of the block */ }; /* * Codes for operating systems */ #define NILFS_OS_LINUX 0 /* Codes from 1 to 4 are reserved to keep compatibility with ext2 creator-OS */ /* * Revision levels */ #define NILFS_CURRENT_REV 2 /* current major revision */ #define NILFS_MINOR_REV 0 /* minor revision */ #define NILFS_MIN_SUPP_REV 2 /* minimum supported revision */ /* * Feature set definitions * * If there is a bit set in the incompatible feature set that the kernel * doesn't know about, it should refuse to mount the filesystem. */ #define NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT 0x00000001ULL #define NILFS_FEATURE_COMPAT_SUPP 0ULL #define NILFS_FEATURE_COMPAT_RO_SUPP NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT #define NILFS_FEATURE_INCOMPAT_SUPP 0ULL /* * Bytes count of super_block for CRC-calculation */ #define NILFS_SB_BYTES \ ((long)&((struct nilfs_super_block *)0)->s_reserved) /* * Special inode number */ #define NILFS_ROOT_INO 2 /* Root file inode */ #define NILFS_DAT_INO 3 /* DAT file */ #define NILFS_CPFILE_INO 4 /* checkpoint file */ #define NILFS_SUFILE_INO 5 /* segment usage file */ #define NILFS_IFILE_INO 6 /* ifile */ #define NILFS_ATIME_INO 7 /* Atime file (reserved) */ #define NILFS_XATTR_INO 8 /* Xattribute file (reserved) */ #define NILFS_SKETCH_INO 10 /* Sketch file */ #define NILFS_USER_INO 11 /* Fisrt user's file inode number */ #define NILFS_SB_OFFSET_BYTES 1024 /* byte offset of nilfs superblock */ #define NILFS_SEG_MIN_BLOCKS 16 /* * Minimum number of blocks in * a full segment */ #define NILFS_PSEG_MIN_BLOCKS 2 /* * Minimum number of blocks in * a partial segment */ #define NILFS_MIN_NRSVSEGS 8 /* * Minimum number of reserved * segments */ /* * We call DAT, cpfile, and sufile root metadata files. Inodes of * these files are written in super root block instead of ifile, and * garbage collector doesn't keep any past versions of these files. */ #define NILFS_ROOT_METADATA_FILE(ino) \ ((ino) >= NILFS_DAT_INO && (ino) <= NILFS_SUFILE_INO) /* * bytes offset of secondary super block */ #define NILFS_SB2_OFFSET_BYTES(devsize) ((((devsize) >> 12) - 1) << 12) /* * Maximal count of links to a file */ #define NILFS_LINK_MAX 32000 /* * Structure of a directory entry * (Same as ext2) */ #define NILFS_NAME_LEN 255 /* * Block size limitations */ #define NILFS_MIN_BLOCK_SIZE 1024 #define NILFS_MAX_BLOCK_SIZE 65536 /* * The new version of the directory entry. Since V0 structures are * stored in intel byte order, and the name_len field could never be * bigger than 255 chars, it's safe to reclaim the extra byte for the * file_type field. */ struct nilfs_dir_entry { __le64 inode; /* Inode number */ __le16 rec_len; /* Directory entry length */ __u8 name_len; /* Name length */ __u8 file_type; /* Dir entry type (file, dir, etc) */ char name[NILFS_NAME_LEN]; /* File name */ char pad; }; /* * NILFS directory file types. Only the low 3 bits are used. The * other bits are reserved for now. */ enum { NILFS_FT_UNKNOWN, NILFS_FT_REG_FILE, NILFS_FT_DIR, NILFS_FT_CHRDEV, NILFS_FT_BLKDEV, NILFS_FT_FIFO, NILFS_FT_SOCK, NILFS_FT_SYMLINK, NILFS_FT_MAX }; /* * NILFS_DIR_PAD defines the directory entries boundaries * * NOTE: It must be a multiple of 8 */ #define NILFS_DIR_PAD 8 #define NILFS_DIR_ROUND (NILFS_DIR_PAD - 1) #define NILFS_DIR_REC_LEN(name_len) (((name_len) + 12 + NILFS_DIR_ROUND) & \ ~NILFS_DIR_ROUND) #define NILFS_MAX_REC_LEN ((1 << 16) - 1) /** * struct nilfs_finfo - file information * @fi_ino: inode number * @fi_cno: checkpoint number * @fi_nblocks: number of blocks (including intermediate blocks) * @fi_ndatablk: number of file data blocks */ struct nilfs_finfo { __le64 fi_ino; __le64 fi_cno; __le32 fi_nblocks; __le32 fi_ndatablk; }; /** * struct nilfs_binfo_v - information on a data block (except DAT) * @bi_vblocknr: virtual block number * @bi_blkoff: block offset */ struct nilfs_binfo_v { __le64 bi_vblocknr; __le64 bi_blkoff; }; /** * struct nilfs_binfo_dat - information on a DAT node block * @bi_blkoff: block offset * @bi_level: level * @bi_pad: padding */ struct nilfs_binfo_dat { __le64 bi_blkoff; __u8 bi_level; __u8 bi_pad[7]; }; /** * union nilfs_binfo: block information * @bi_v: nilfs_binfo_v structure * @bi_dat: nilfs_binfo_dat structure */ union nilfs_binfo { struct nilfs_binfo_v bi_v; struct nilfs_binfo_dat bi_dat; }; /** * struct nilfs_segment_summary - segment summary header * @ss_datasum: checksum of data * @ss_sumsum: checksum of segment summary * @ss_magic: magic number * @ss_bytes: size of this structure in bytes * @ss_flags: flags * @ss_seq: sequence number * @ss_create: creation timestamp * @ss_next: next segment * @ss_nblocks: number of blocks * @ss_nfinfo: number of finfo structures * @ss_sumbytes: total size of segment summary in bytes * @ss_pad: padding * @ss_cno: checkpoint number */ struct nilfs_segment_summary { __le32 ss_datasum; __le32 ss_sumsum; __le32 ss_magic; __le16 ss_bytes; __le16 ss_flags; __le64 ss_seq; __le64 ss_create; __le64 ss_next; __le32 ss_nblocks; __le32 ss_nfinfo; __le32 ss_sumbytes; __le32 ss_pad; __le64 ss_cno; /* array of finfo structures */ }; #define NILFS_SEGSUM_MAGIC 0x1eaffa11 /* segment summary magic number */ /* * Segment summary flags */ #define NILFS_SS_LOGBGN 0x0001 /* begins a logical segment */ #define NILFS_SS_LOGEND 0x0002 /* ends a logical segment */ #define NILFS_SS_SR 0x0004 /* has super root */ #define NILFS_SS_SYNDT 0x0008 /* includes data only updates */ #define NILFS_SS_GC 0x0010 /* segment written for cleaner operation */ /** * struct nilfs_btree_node - header of B-tree node block * @bn_flags: flags * @bn_level: level * @bn_nchildren: number of children * @bn_pad: padding */ struct nilfs_btree_node { __u8 bn_flags; __u8 bn_level; __le16 bn_nchildren; __le32 bn_pad; }; /* flags */ #define NILFS_BTREE_NODE_ROOT 0x01 /* level */ #define NILFS_BTREE_LEVEL_DATA 0 #define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1) #define NILFS_BTREE_LEVEL_MAX 14 /* Max level (exclusive) */ /** * struct nilfs_direct_node - header of built-in bmap array * @dn_flags: flags * @dn_pad: padding */ struct nilfs_direct_node { __u8 dn_flags; __u8 pad[7]; }; /** * struct nilfs_palloc_group_desc - block group descriptor * @pg_nfrees: number of free entries in block group */ struct nilfs_palloc_group_desc { __le32 pg_nfrees; }; /** * struct nilfs_dat_entry - disk address translation entry * @de_blocknr: block number * @de_start: start checkpoint number * @de_end: end checkpoint number * @de_rsv: reserved for future use */ struct nilfs_dat_entry { __le64 de_blocknr; __le64 de_start; __le64 de_end; __le64 de_rsv; }; #define NILFS_MIN_DAT_ENTRY_SIZE 32 /** * struct nilfs_snapshot_list - snapshot list * @ssl_next: next checkpoint number on snapshot list * @ssl_prev: previous checkpoint number on snapshot list */ struct nilfs_snapshot_list { __le64 ssl_next; __le64 ssl_prev; }; /** * struct nilfs_checkpoint - checkpoint structure * @cp_flags: flags * @cp_checkpoints_count: checkpoints count in a block * @cp_snapshot_list: snapshot list * @cp_cno: checkpoint number * @cp_create: creation timestamp * @cp_nblk_inc: number of blocks incremented by this checkpoint * @cp_inodes_count: inodes count * @cp_blocks_count: blocks count * @cp_ifile_inode: inode of ifile */ struct nilfs_checkpoint { __le32 cp_flags; __le32 cp_checkpoints_count; struct nilfs_snapshot_list cp_snapshot_list; __le64 cp_cno; __le64 cp_create; __le64 cp_nblk_inc; __le64 cp_inodes_count; __le64 cp_blocks_count; /* * Do not change the byte offset of ifile inode. * To keep the compatibility of the disk format, * additional fields should be added behind cp_ifile_inode. */ struct nilfs_inode cp_ifile_inode; }; #define NILFS_MIN_CHECKPOINT_SIZE (64 + NILFS_MIN_INODE_SIZE) /* checkpoint flags */ enum { NILFS_CHECKPOINT_SNAPSHOT, NILFS_CHECKPOINT_INVALID, NILFS_CHECKPOINT_SKETCH, NILFS_CHECKPOINT_MINOR, }; #define NILFS_CHECKPOINT_FNS(flag, name) \ static __inline__ void \ nilfs_checkpoint_set_##name(struct nilfs_checkpoint *cp) \ { \ cp->cp_flags = __cpu_to_le32(__le32_to_cpu(cp->cp_flags) | \ (1UL << NILFS_CHECKPOINT_##flag)); \ } \ static __inline__ void \ nilfs_checkpoint_clear_##name(struct nilfs_checkpoint *cp) \ { \ cp->cp_flags = __cpu_to_le32(__le32_to_cpu(cp->cp_flags) & \ ~(1UL << NILFS_CHECKPOINT_##flag)); \ } \ static __inline__ int \ nilfs_checkpoint_##name(const struct nilfs_checkpoint *cp) \ { \ return !!(__le32_to_cpu(cp->cp_flags) & \ (1UL << NILFS_CHECKPOINT_##flag)); \ } NILFS_CHECKPOINT_FNS(SNAPSHOT, snapshot) NILFS_CHECKPOINT_FNS(INVALID, invalid) NILFS_CHECKPOINT_FNS(MINOR, minor) /** * struct nilfs_cpfile_header - checkpoint file header * @ch_ncheckpoints: number of checkpoints * @ch_nsnapshots: number of snapshots * @ch_snapshot_list: snapshot list */ struct nilfs_cpfile_header { __le64 ch_ncheckpoints; __le64 ch_nsnapshots; struct nilfs_snapshot_list ch_snapshot_list; }; #define NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET \ ((sizeof(struct nilfs_cpfile_header) + \ sizeof(struct nilfs_checkpoint) - 1) / \ sizeof(struct nilfs_checkpoint)) /** * struct nilfs_segment_usage - segment usage * @su_lastmod: last modified timestamp * @su_nblocks: number of blocks in segment * @su_flags: flags */ struct nilfs_segment_usage { __le64 su_lastmod; __le32 su_nblocks; __le32 su_flags; }; #define NILFS_MIN_SEGMENT_USAGE_SIZE 16 /* segment usage flag */ enum { NILFS_SEGMENT_USAGE_ACTIVE, NILFS_SEGMENT_USAGE_DIRTY, NILFS_SEGMENT_USAGE_ERROR, }; #define NILFS_SEGMENT_USAGE_FNS(flag, name) \ static __inline__ void \ nilfs_segment_usage_set_##name(struct nilfs_segment_usage *su) \ { \ su->su_flags = __cpu_to_le32(__le32_to_cpu(su->su_flags) | \ (1UL << NILFS_SEGMENT_USAGE_##flag));\ } \ static __inline__ void \ nilfs_segment_usage_clear_##name(struct nilfs_segment_usage *su) \ { \ su->su_flags = \ __cpu_to_le32(__le32_to_cpu(su->su_flags) & \ ~(1UL << NILFS_SEGMENT_USAGE_##flag)); \ } \ static __inline__ int \ nilfs_segment_usage_##name(const struct nilfs_segment_usage *su) \ { \ return !!(__le32_to_cpu(su->su_flags) & \ (1UL << NILFS_SEGMENT_USAGE_##flag)); \ } NILFS_SEGMENT_USAGE_FNS(ACTIVE, active) NILFS_SEGMENT_USAGE_FNS(DIRTY, dirty) NILFS_SEGMENT_USAGE_FNS(ERROR, error) static __inline__ void nilfs_segment_usage_set_clean(struct nilfs_segment_usage *su) { su->su_lastmod = __cpu_to_le64(0); su->su_nblocks = __cpu_to_le32(0); su->su_flags = __cpu_to_le32(0); } static __inline__ int nilfs_segment_usage_clean(const struct nilfs_segment_usage *su) { return !__le32_to_cpu(su->su_flags); } /** * struct nilfs_sufile_header - segment usage file header * @sh_ncleansegs: number of clean segments * @sh_ndirtysegs: number of dirty segments * @sh_last_alloc: last allocated segment number */ struct nilfs_sufile_header { __le64 sh_ncleansegs; __le64 sh_ndirtysegs; __le64 sh_last_alloc; /* ... */ }; #define NILFS_SUFILE_FIRST_SEGMENT_USAGE_OFFSET \ ((sizeof(struct nilfs_sufile_header) + \ sizeof(struct nilfs_segment_usage) - 1) / \ sizeof(struct nilfs_segment_usage)) #endif /* _LINUX_NILFS2_ONDISK_H */