/* SPDX-License-Identifier: GPL-2.0 *//* * 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 */#include <linux/fs.h>#include <linux/ext2_fs.h>#include <linux/blockgroup_lock.h>#include <linux/percpu_counter.h>#include <linux/rbtree.h>#include <linux/mm.h>#include <linux/highmem.h> /* XXX Here for now... not interested in restructing headers JUST now */ /* data type for block offset of block group */typedef int ext2_grpblk_t; /* data type for filesystem-wide blocks number */typedef unsigned long ext2_fsblk_t; #define E2FSBLK "%lu" struct ext2_reserve_window { ext2_fsblk_t _rsv_start; /* First byte reserved */ ext2_fsblk_t _rsv_end; /* Last byte reserved or 0 */}; struct ext2_reserve_window_node { struct rb_node rsv_node; __u32 rsv_goal_size; __u32 rsv_alloc_hit; struct ext2_reserve_window rsv_window;}; struct ext2_block_alloc_info { /* information about reservation window */ struct ext2_reserve_window_node rsv_window_node; /* * was i_next_alloc_block in ext2_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 ext2_inode_info * is the *physical* companion to i_next_alloc_block. * it is the physical block number of the block which was most-recently * allocated to this file. This gives us the goal (target) for the next * allocation when we detect linearly ascending requests. */ ext2_fsblk_t last_alloc_physical_block;}; #define rsv_start rsv_window._rsv_start#define rsv_end rsv_window._rsv_end struct mb_cache; /* * second extended-fs super-block data in memory */struct ext2_sb_info { unsigned long s_inodes_per_block;/* Number of inodes per block */ 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 ext2_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 ext2_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 ext2_show_options() to provide a consistent view * of the mount options. */ spinlock_t s_lock; struct mb_cache *s_ea_block_cache;}; static inline spinlock_t *sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group){ return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);} /* * Define EXT2FS_DEBUG to produce debug messages */#undef EXT2FS_DEBUG /* * Define EXT2_RESERVATION to reserve data blocks for expanding files */#define EXT2_DEFAULT_RESERVE_BLOCKS 8/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */#define EXT2_MAX_RESERVE_BLOCKS 1027#define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0/* * The second extended file system version */#define EXT2FS_DATE "95/08/09"#define EXT2FS_VERSION "0.5b" /* * Debug code */#ifdef EXT2FS_DEBUG# define ext2_debug(f, a...) { \ printk ("EXT2-fs DEBUG (%s, %d): %s:", \ __FILE__, __LINE__, __func__); \ printk (f, ## a); \ }#else# define ext2_debug(f, a...) /**/#endif /* * Special inode numbers */#define EXT2_BAD_INO 1 /* Bad blocks inode */#define EXT2_ROOT_INO 2 /* Root inode */#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ /* First non-reserved inode for old ext2 filesystems */#define EXT2_GOOD_OLD_FIRST_INO 11 static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb){ return sb->s_fs_info;} /* * Macro-instructions used to manage several block sizes */#define EXT2_MIN_BLOCK_SIZE 1024#define EXT2_MAX_BLOCK_SIZE 65536#define EXT2_MIN_BLOCK_LOG_SIZE 10#define EXT2_MAX_BLOCK_LOG_SIZE 16#define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32))#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)#define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits)#define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size)#define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) /* * Structure of a blocks group descriptor */struct ext2_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];}; /* * Macro-instructions used to manage group descriptors */#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)#define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block)#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)#define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) /* * Constants relative to the data blocks */#define EXT2_NDIR_BLOCKS 12#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) /* * Inode flags (GETFLAGS/SETFLAGS) */#define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */#define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */#define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */#define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */#define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */#define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */#define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */#define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime *//* Reserved for compression usage... */#define EXT2_DIRTY_FL FS_DIRTY_FL#define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */#define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */#define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error *//* End compression flags --- maybe not all used */ #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */#define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */#define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */#define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */#define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */#define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */#define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/#define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */ #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */#define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */ /* Flags that should be inherited by new inodes from their parent. */#define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\ EXT2_SYNC_FL | EXT2_NODUMP_FL |\ EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\ EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\ EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL) /* Flags that are appropriate for regular files (all but dir-specific ones). */#define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL)) /* Flags that are appropriate for non-directories/regular files. */#define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL) /* Mask out flags that are inappropriate for the given type of inode. */static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags){ if (S_ISDIR(mode)) return flags; else if (S_ISREG(mode)) return flags & EXT2_REG_FLMASK; else return flags & EXT2_OTHER_FLMASK;} /* * ioctl commands */#define EXT2_IOC_GETVERSION FS_IOC_GETVERSION#define EXT2_IOC_SETVERSION FS_IOC_SETVERSION#define EXT2_IOC_GETRSVSZ _IOR('f', 5, long)#define EXT2_IOC_SETRSVSZ _IOW('f', 6, long) /* * ioctl commands in 32 bit emulation */#define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION#define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION /* * Structure of an inode on the disk */struct ext2_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[EXT2_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 */}; #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 EXT2_VALID_FS 0x0001 /* Unmounted cleanly */#define EXT2_ERROR_FS 0x0002 /* Errors detected */ /* * Mount flags */#define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */#define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */#define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */#define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */#define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */#define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */#define EXT2_MOUNT_ERRORS_MASK 0x000070#define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */#define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */#define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */#define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */#define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */#define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */#define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */#define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */ #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt#define set_opt(o, opt) o |= EXT2_MOUNT_##opt#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ EXT2_MOUNT_##opt)/* * Maximal mount counts between two filesystem checks */#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ /* * Behaviour when detecting errors */#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */#define EXT2_ERRORS_RO 2 /* Remount fs read-only */#define EXT2_ERRORS_PANIC 3 /* Panic */#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE /* * Allocation flags */#define EXT2_ALLOC_NORESERVE 0x1 /* Do not use reservation * window for allocation */ /* * Structure of the super block */struct ext2_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 EXT2_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 EXT2_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 */}; /* * Codes for operating systems */#define EXT2_OS_LINUX 0#define EXT2_OS_HURD 1#define EXT2_OS_MASIX 2#define EXT2_OS_FREEBSD 3#define EXT2_OS_LITES 4 /* * Revision levels */#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV #define EXT2_GOOD_OLD_INODE_SIZE 128 /* * Feature set definitions */Lines 1–500 of 815. 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/* SPDX-License-Identifier: GPL-2.0 */ /* * 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 */ #include <linux/fs.h> #include <linux/ext2_fs.h> #include <linux/blockgroup_lock.h> #include <linux/percpu_counter.h> #include <linux/rbtree.h> #include <linux/mm.h> #include <linux/highmem.h> /* XXX Here for now... not interested in restructing headers JUST now */ /* data type for block offset of block group */ typedef int ext2_grpblk_t; /* data type for filesystem-wide blocks number */ typedef unsigned long ext2_fsblk_t; #define E2FSBLK "%lu" struct ext2_reserve_window { ext2_fsblk_t _rsv_start; /* First byte reserved */ ext2_fsblk_t _rsv_end; /* Last byte reserved or 0 */ }; struct ext2_reserve_window_node { struct rb_node rsv_node; __u32 rsv_goal_size; __u32 rsv_alloc_hit; struct ext2_reserve_window rsv_window; }; struct ext2_block_alloc_info { /* information about reservation window */ struct ext2_reserve_window_node rsv_window_node; /* * was i_next_alloc_block in ext2_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 ext2_inode_info * is the *physical* companion to i_next_alloc_block. * it is the physical block number of the block which was most-recently * allocated to this file. This gives us the goal (target) for the next * allocation when we detect linearly ascending requests. */ ext2_fsblk_t last_alloc_physical_block; }; #define rsv_start rsv_window._rsv_start #define rsv_end rsv_window._rsv_end struct mb_cache; /* * second extended-fs super-block data in memory */ struct ext2_sb_info { unsigned long s_inodes_per_block;/* Number of inodes per block */ 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 ext2_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 ext2_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 ext2_show_options() to provide a consistent view * of the mount options. */ spinlock_t s_lock; struct mb_cache *s_ea_block_cache; }; static inline spinlock_t * sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group) { return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group); } /* * Define EXT2FS_DEBUG to produce debug messages */ #undef EXT2FS_DEBUG /* * Define EXT2_RESERVATION to reserve data blocks for expanding files */ #define EXT2_DEFAULT_RESERVE_BLOCKS 8 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ #define EXT2_MAX_RESERVE_BLOCKS 1027 #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0 /* * The second extended file system version */ #define EXT2FS_DATE "95/08/09" #define EXT2FS_VERSION "0.5b" /* * Debug code */ #ifdef EXT2FS_DEBUG # define ext2_debug(f, a...) { \ printk ("EXT2-fs DEBUG (%s, %d): %s:", \ __FILE__, __LINE__, __func__); \ printk (f, ## a); \ } #else # define ext2_debug(f, a...) /**/ #endif /* * Special inode numbers */ #define EXT2_BAD_INO 1 /* Bad blocks inode */ #define EXT2_ROOT_INO 2 /* Root inode */ #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ /* First non-reserved inode for old ext2 filesystems */ #define EXT2_GOOD_OLD_FIRST_INO 11 static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb) { return sb->s_fs_info; } /* * Macro-instructions used to manage several block sizes */ #define EXT2_MIN_BLOCK_SIZE 1024 #define EXT2_MAX_BLOCK_SIZE 65536 #define EXT2_MIN_BLOCK_LOG_SIZE 10 #define EXT2_MAX_BLOCK_LOG_SIZE 16 #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits) #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) /* * Structure of a blocks group descriptor */ struct ext2_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]; }; /* * Macro-instructions used to manage group descriptors */ #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) #define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) #define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) /* * Constants relative to the data blocks */ #define EXT2_NDIR_BLOCKS 12 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) /* * Inode flags (GETFLAGS/SETFLAGS) */ #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */ #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */ #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */ #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */ #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */ #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */ #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */ #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */ /* Reserved for compression usage... */ #define EXT2_DIRTY_FL FS_DIRTY_FL #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */ #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */ #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */ /* End compression flags --- maybe not all used */ #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */ #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */ #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */ #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */ #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */ #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */ #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/ #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */ #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */ #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */ /* Flags that should be inherited by new inodes from their parent. */ #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\ EXT2_SYNC_FL | EXT2_NODUMP_FL |\ EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\ EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\ EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL) /* Flags that are appropriate for regular files (all but dir-specific ones). */ #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL)) /* Flags that are appropriate for non-directories/regular files. */ #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL) /* Mask out flags that are inappropriate for the given type of inode. */ static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags) { if (S_ISDIR(mode)) return flags; else if (S_ISREG(mode)) return flags & EXT2_REG_FLMASK; else return flags & EXT2_OTHER_FLMASK; } /* * ioctl commands */ #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long) #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long) /* * ioctl commands in 32 bit emulation */ #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION /* * Structure of an inode on the disk */ struct ext2_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[EXT2_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 */ }; #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 EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ #define EXT2_ERROR_FS 0x0002 /* Errors detected */ /* * Mount flags */ #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ #define EXT2_MOUNT_ERRORS_MASK 0x000070 #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */ #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt #define set_opt(o, opt) o |= EXT2_MOUNT_##opt #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ EXT2_MOUNT_##opt) /* * Maximal mount counts between two filesystem checks */ #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ /* * Behaviour when detecting errors */ #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ #define EXT2_ERRORS_PANIC 3 /* Panic */ #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE /* * Allocation flags */ #define EXT2_ALLOC_NORESERVE 0x1 /* Do not use reservation * window for allocation */ /* * Structure of the super block */ struct ext2_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 EXT2_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 EXT2_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 */ }; /* * Codes for operating systems */ #define EXT2_OS_LINUX 0 #define EXT2_OS_HURD 1 #define EXT2_OS_MASIX 2 #define EXT2_OS_FREEBSD 3 #define EXT2_OS_LITES 4 /* * Revision levels */ #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV #define EXT2_GOOD_OLD_INODE_SIZE 128 /* * Feature set definitions */