#include <linux/blockgroup_lock.h> #define ATFS_NAME_LEN 255 /* data type for block offset of block group */ typedef int atfs_grpblk_t; /* data type for filesystem-wide blocks number */ typedef unsigned long atfs_fsblk_t; struct atfs_reserve_window { atfs_fsblk_t _rsv_start; /* First byte reserved */ atfs_fsblk_t _rsv_end; /* Last byte reserved or 0 */ }; struct atfs_reserve_window_node { struct rb_node rsv_node; __u32 rsv_goal_size; __u32 rsv_alloc_hit; struct atfs_reserve_window rsv_window; }; #define rsv_start rsv_window._rsv_start #define rsv_end rsv_window._rsv_end struct atfs_block_alloc_info { /* information about reservation window */ struct atfs_reserve_window_node rsv_window_node; /* * was i_next_alloc_block in atfs_inode_info * is the logical (file-relative) number of the * most-recently-allocated block in this file. * We use this for detecting linearly ascending allocation requests. */ __u32 last_alloc_logical_block; /* * Was i_next_alloc_goal in atfs_inode_info * is the *physical* companion to i_next_alloc_block. * it the the physical block number of the block which was most-recentl * allocated to this file. This give us the goal (target) for the next * allocation when we detect linearly ascending requests. */ atfs_fsblk_t last_alloc_physical_block; }; /* * Structure of the super block */ struct atfs_super_block { __le32 s_inodes_count; /* Inodes count */ __le32 s_blocks_count; /* Blocks count */ __le32 s_r_blocks_count; /* Reserved blocks count */ __le32 s_free_blocks_count; /* Free blocks count */ __le32 s_free_inodes_count; /* Free inodes count */ __le32 s_first_data_block; /* First Data Block */ __le32 s_log_block_size; /* Block size */ __le32 s_log_frag_size; /* Fragment size */ __le32 s_blocks_per_group; /* # Blocks per group */ __le32 s_frags_per_group; /* # Fragments per group */ __le32 s_inodes_per_group; /* # Inodes per group */ __le32 s_mtime; /* Mount time */ __le32 s_wtime; /* Write time */ __le16 s_mnt_count; /* Mount count */ __le16 s_max_mnt_count; /* Maximal mount count */ __le16 s_magic; /* Magic signature */ __le16 s_state; /* File system state */ __le16 s_errors; /* Behaviour when detecting errors */ __le16 s_minor_rev_level; /* minor revision level */ __le32 s_lastcheck; /* time of last check */ __le32 s_checkinterval; /* max. time between checks */ __le32 s_creator_os; /* OS */ __le32 s_rev_level; /* Revision level */ __le16 s_def_resuid; /* Default uid for reserved blocks */ __le16 s_def_resgid; /* Default gid for reserved blocks */ /* * These fields are for ATFS_DYNAMIC_REV superblocks only. * * Note: the difference between the compatible feature set and * the incompatible feature set is that 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. * * e2fsck's requirements are more strict; if it doesn't know * about a feature in either the compatible or incompatible * feature set, it must abort and not try to meddle with * things it doesn't understand... */ __le32 s_first_ino; /* First non-reserved inode */ __le16 s_inode_size; /* size of inode structure */ __le16 s_block_group_nr; /* block group # of this superblock */ __le32 s_feature_compat; /* compatible feature set */ __le32 s_feature_incompat; /* incompatible feature set */ __le32 s_feature_ro_compat; /* readonly-compatible feature set */ __u8 s_uuid[16]; /* 128-bit uuid for volume */ char s_volume_name[16]; /* volume name */ char s_last_mounted[64]; /* directory where last mounted */ __le32 s_algorithm_usage_bitmap; /* For compression */ /* * Performance hints. Directory preallocation should only * happen if the ATFS_COMPAT_PREALLOC flag is on. */ __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ __u16 s_padding1; /* * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. */ __u8 s_journal_uuid[16]; /* uuid of journal superblock */ __u32 s_journal_inum; /* inode number of journal file */ __u32 s_journal_dev; /* device number of journal file */ __u32 s_last_orphan; /* start of list of inodes to delete */ __u32 s_hash_seed[4]; /* HTREE hash seed */ __u8 s_def_hash_version; /* Default hash version to use */ __u8 s_reserved_char_pad; __u16 s_reserved_word_pad; __le32 s_default_mount_opts; __le32 s_first_meta_bg; /* First metablock block group */ __u32 s_reserved[190]; /* Padding to the end of the block */ }; /* * atfs file system inode data in memory */ struct atfs_inode_info { __le32 i_data[15]; __u32 i_flags; __u32 i_faddr; __u8 i_frag_no; __u8 i_frag_size; __u16 i_state; __u32 i_file_acl; __u32 i_dir_acl; __u32 i_dtime; /* * i_block_group is the number of the block group which contains * this file's inode. Constant across the lifetime of the inode, * it is used for making block allocation decisions - we try to * place a file's data blocks near its inode block, and new inodes * near to their parent directory's inode. */ __u32 i_block_group; /* block reservation info */ struct atfs_block_alloc_info *i_block_alloc_info; __u32 i_dir_start_lookup; rwlock_t i_meta_lock; /* * truncate_mutex is for serialising atfs_truncate() against * atfs_getblock(). It also protects the internals of the inode's * reservation data structures: atfs_reserve_window and * atfs_reserve_window_node. */ struct mutex truncate_mutex; struct inode vfs_inode; struct list_head i_orphan; /* unlinked but open inodes */ }; /* * atfs file system super-block data in memory */ struct atfs_sb_info { unsigned long s_frag_size; /* Size of a fragment in bytes */ unsigned long s_frags_per_block;/* Number of fragments per block */ unsigned long s_inodes_per_block;/* Number of inodes per block */ unsigned long s_frags_per_group;/* Number of fragments in a group */ unsigned long s_blocks_per_group;/* Number of blocks in a group */ unsigned long s_inodes_per_group;/* Number of inodes in a group */ unsigned long s_itb_per_group; /* Number of inode table blocks per group */ unsigned long s_gdb_count; /* Number of group descriptor blocks */ unsigned long s_desc_per_block; /* Number of group descriptors per block */ unsigned long s_groups_count; /* Number of groups in the fs */ unsigned long s_overhead_last; /* Last calculated overhead */ unsigned long s_blocks_last; /* Last seen block count */ struct buffer_head * s_sbh; /* Buffer containing the super block */ struct atfs_super_block * s_es; /* Pointer to the super block in the buffer */ struct buffer_head ** s_group_desc; unsigned long s_mount_opt; unsigned long s_sb_block; kuid_t s_resuid; kgid_t s_resgid; unsigned short s_mount_state; unsigned short s_pad; int s_addr_per_block_bits; int s_desc_per_block_bits; int s_inode_size; int s_first_ino; spinlock_t s_next_gen_lock; u32 s_next_generation; unsigned long s_dir_count; u8 *s_debts; struct percpu_counter s_freeblocks_counter; struct percpu_counter s_freeinodes_counter; struct percpu_counter s_dirs_counter; struct blockgroup_lock *s_blockgroup_lock; /* root of the per fs reservation window tree */ spinlock_t s_rsv_window_lock; struct rb_root s_rsv_window_root; struct atfs_reserve_window_node s_rsv_window_head; /* * s_lock protects against concurrent modifications of s_mount_state, * s_blocks_last, s_overhead_last and the content of superblock's * buffer pointed to by sbi->s_es. * * Note: It is used in atfs_show_options() to provide a consistent view * of the mount options. */ spinlock_t s_lock; struct mb_cache *s_ea_block_cache; struct dax_device *s_daxdev; }; static inline struct atfs_sb_info *ATFS_SB(struct super_block *sb) { return sb->s_fs_info; } /* * Structure of a blocks group descriptor */ struct atfs_group_desc { __le32 bg_block_bitmap; /* Blocks bitmap block */ __le32 bg_inode_bitmap; /* Inodes bitmap block */ __le32 bg_inode_table; /* Inodes table block */ __le16 bg_free_blocks_count; /* Free blocks count */ __le16 bg_free_inodes_count; /* Free inodes count */ __le16 bg_used_dirs_count; /* Directories count */ __le16 bg_pad; __le32 bg_reserved[3]; }; /* * Special inode numbers */ #define ATFS_BAD_INO 1 /* Bad blocks inode */ #define ATFS_ROOT_INO 2 /* Root inode */ #define ATFS_BOOT_LOADER_INO 5 /* Boot loader inode */ #define ATFS_UNDEL_DIR_INO 6 /* Undelete directory inode */ /* * Macro-instructions used to manage group descriptors */ #define ATFS_BLOCKS_PER_GROUP(s) (ATFS_SB(s)->s_blocks_per_group) #define ATFS_DESC_PER_BLOCK(s) (ATFS_SB(s)->s_desc_per_block) #define ATFS_INODES_PER_GROUP(s) (ATFS_SB(s)->s_inodes_per_group) #define ATFS_DESC_PER_BLOCK_BITS(s) (ATFS_SB(s)->s_desc_per_block_bits) /* * Macro-instructions used to manage several block sizes */ #define ATFS_MIN_BLOCK_SIZE 1024 #define ATFS_MAX_BLOCK_SIZE 4096 #define ATFS_MIN_BLOCK_LOG_SIZE 10 #define ATFS_BLOCK_SIZE(s) ((s)->s_blocksize) #define ATFS_ADDR_PER_BLOCK(s) (ATFS_BLOCK_SIZE(s) / sizeof (__u32)) #define ATFS_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) #define ATFS_ADDR_PER_BLOCK_BITS(s) (ATFS_SB(s)->s_addr_per_block_bits) #define ATFS_INODE_SIZE(s) (ATFS_SB(s)->s_inode_size) #define ATFS_FIRST_INO(s) (ATFS_SB(s)->s_first_ino) /* * Macro-instructions used to manage fragments */ #define ATFS_MIN_FRAG_SIZE 1024 #define ATFS_MAX_FRAG_SIZE 4096 #define ATFS_MIN_FRAG_LOG_SIZE 10 #define ATFS_FRAG_SIZE(s) (ATFS_SB(s)->s_frag_size) #define ATFS_FRAGS_PER_BLOCK(s) (ATFS_SB(s)->s_frags_per_block) /* * Constants relative to the data blocks */ #define ATFS_NDIR_BLOCKS 12 #define ATFS_IND_BLOCK ATFS_NDIR_BLOCKS #define ATFS_DIND_BLOCK (ATFS_IND_BLOCK + 1) #define ATFS_TIND_BLOCK (ATFS_DIND_BLOCK + 1) #define ATFS_N_BLOCKS (ATFS_TIND_BLOCK + 1) /* * Inode flags (GETFLAGS/SETFLAGS) */ #define ATFS_SECRM_FL FS_SECRM_FL /* Secure deletion */ #define ATFS_UNRM_FL FS_UNRM_FL /* Undelete */ #define ATFS_COMPR_FL FS_COMPR_FL /* Compress file */ #define ATFS_SYNC_FL FS_SYNC_FL /* Synchronous updates */ #define ATFS_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */ #define ATFS_APPEND_FL FS_APPEND_FL /* writes to file may only append */ #define ATFS_NODUMP_FL FS_NODUMP_FL /* do not dump file */ #define ATFS_NOATIME_FL FS_NOATIME_FL /* do not update atime */ /* Reserved for compression usage... */ #define ATFS_DIRTY_FL FS_DIRTY_FL #define ATFS_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */ #define ATFS_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */ #define ATFS_ECOMPR_FL FS_ECOMPR_FL /* Compression error */ /* End compression flags --- maybe not all used */ #define ATFS_BTREE_FL FS_BTREE_FL /* btree format dir */ #define ATFS_INDEX_FL FS_INDEX_FL /* hash-indexed directory */ #define ATFS_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */ #define ATFS_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */ #define ATFS_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */ #define ATFS_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */ #define ATFS_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/ #define ATFS_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */ #define ATFS_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */ #define ATFS_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */ /* * Define ATFS_RESERVATION to reserve data blocks for expanding files */ #define ATFS_DEFAULT_RESERVE_BLOCKS 8 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ #define ATFS_MAX_RESERVE_BLOCKS 1027 #define ATFS_RESERVE_WINDOW_NOT_ALLOCATED 0 /* * ATFS file system version */ #define ATFSFS_DATE "2020/10/20" #define ATFSFS_VERSION "0.1b" #define i_size_high i_dir_acl #define i_reserved1 osd1.linux1.l_i_reserved1 #define i_frag osd2.linux2.l_i_frag #define i_fsize osd2.linux2.l_i_fsize #define i_uid_low i_uid #define i_gid_low i_gid #define i_uid_high osd2.linux2.l_i_uid_high #define i_gid_high osd2.linux2.l_i_gid_high #define i_reserved2 osd2.linux2.l_i_reserved2 /* * File system states */ #define ATFS_VALID_FS 0x0001 /* Unmounted cleanly */ #define ATFS_ERROR_FS 0x0002 /* Errors detected */ #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ /* * Mount flags */ #define ATFS_MOUNT_CHECK 0x000001 /* Do mount-time checks */ #define ATFS_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ #define ATFS_MOUNT_GRPID 0x000004 /* Create files with directory's group */ #define ATFS_MOUNT_DEBUG 0x000008 /* Some debugging messages */ #define ATFS_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ #define ATFS_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ #define ATFS_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ #define ATFS_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ #define ATFS_MOUNT_NOBH 0x000100 /* No buffer_heads */ #define ATFS_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ #define ATFS_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ #define ATFS_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ #define ATFS_MOUNT_XIP 0x010000 /* Obsolete, use DAX */ #define ATFS_MOUNT_USRQUOTA 0x020000 /* user quota */ #define ATFS_MOUNT_GRPQUOTA 0x040000 /* group quota */ #define ATFS_MOUNT_RESERVATION 0x080000 /* Preallocation */ #define ATFS_MOUNT_DAX 0x100000 /* Direct Access */ #define clear_opt(o, opt) o &= ~ATFS_MOUNT_##opt #define set_opt(o, opt) o |= ATFS_MOUNT_##opt #define test_opt(sb, opt) (ATFS_SB(sb)->s_mount_opt & \ ATFS_MOUNT_##opt) static inline spinlock_t * sb_bgl_lock(struct atfs_sb_info *sbi, unsigned int block_group) { return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group); } /* * Ok, these declarations are also in <linux/kernel.h> but none of the * atfs source programs needs to include it so they are duplicated here. */ static inline struct atfs_inode_info *ATFS_I(struct inode *inode) { return container_of(inode, struct atfs_inode_info, vfs_inode); } static inline atfs_fsblk_t atfs_group_first_block_no(struct super_block *sb, unsigned long group_no) { return group_no * (atfs_fsblk_t)ATFS_BLOCKS_PER_GROUP(sb) + le32_to_cpu(ATFS_SB(sb)->s_es->s_first_data_block); } #define atfs_set_bit __test_and_set_bit_le #define atfs_clear_bit __test_and_clear_bit_le #define atfs_test_bit test_bit_le #define atfs_find_first_zero_bit find_first_zero_bit_le #define atfs_find_next_zero_bit find_next_zero_bit_le #define atfs_set_bit_atomic(l, nr, addr) test_and_set_bit_le(nr, addr) #define atfs_clear_bit_atomic(l, nr, addr) test_and_clear_bit_le(nr, addr) /* * Structure of an inode on the disk */ struct atfs_inode { __le16 i_mode; /* File mode */ __le16 i_uid; /* Low 16 bits of Owner Uid */ __le32 i_size; /* Size in bytes */ __le32 i_atime; /* Access time */ __le32 i_ctime; /* Creation time */ __le32 i_mtime; /* Modification time */ __le32 i_dtime; /* Deletion Time */ __le16 i_gid; /* Low 16 bits of Group Id */ __le16 i_links_count; /* Links count */ __le32 i_blocks; /* Blocks count */ __le32 i_flags; /* File flags */ union { struct { __le32 l_i_reserved1; } linux1; struct { __le32 h_i_translator; } hurd1; struct { __le32 m_i_reserved1; } masix1; } osd1; /* OS dependent 1 */ __le32 i_block[ATFS_N_BLOCKS];/* Pointers to blocks */ __le32 i_generation; /* File version (for NFS) */ __le32 i_file_acl; /* File ACL */ __le32 i_dir_acl; /* Directory ACL */ __le32 i_faddr; /* Fragment address */ union { struct { __u8 l_i_frag; /* Fragment number */ __u8 l_i_fsize; /* Fragment size */ __u16 i_pad1; __le16 l_i_uid_high; /* these 2 fields */ __le16 l_i_gid_high; /* were reserved2[0] */ __u32 l_i_reserved2; } linux2; struct { __u8 h_i_frag; /* Fragment number */ __u8 h_i_fsize; /* Fragment size */ __le16 h_i_mode_high; __le16 h_i_uid_high; __le16 h_i_gid_high; __le32 h_i_author; } hurd2; struct { __u8 m_i_frag; /* Fragment number */ __u8 m_i_fsize; /* Fragment size */ __u16 m_pad1; __u32 m_i_reserved2[2]; } masix2; } osd2; /* OS dependent 2 */ };