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Diffstat (limited to 'fs/ext2/ext2.h')
| -rw-r--r-- | fs/ext2/ext2.h | 824 |
1 files changed, 824 insertions, 0 deletions
diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h new file mode 100644 index 0000000000..7fdd685c38 --- /dev/null +++ b/fs/ext2/ext2.h @@ -0,0 +1,824 @@ +/* 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; + struct dax_device *s_daxdev; + u64 s_dax_part_off; +}; + +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 */ +#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ + +/* + * 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_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_XIP 0x010000 /* Obsolete, use DAX */ +#define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ +#define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ +#define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */ +#define EXT2_MOUNT_DAX 0x100000 /* Direct Access */ + + +#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 + */ + +#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ + ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) +#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ + ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) +#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ + ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) +#define EXT2_SET_COMPAT_FEATURE(sb,mask) \ + EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) +#define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ + EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) +#define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ + EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) +#define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ + EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) +#define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ + EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) +#define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ + EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) + +#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 +#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 +#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 +#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 +#define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 +#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 +#define EXT2_FEATURE_COMPAT_ANY 0xffffffff + +#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 +#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 +#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 +#define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff + +#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 +#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 +#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 +#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 +#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 +#define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff + +#define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR +#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ + EXT2_FEATURE_INCOMPAT_META_BG) +#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ + EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ + EXT2_FEATURE_RO_COMPAT_BTREE_DIR) +#define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP +#define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP + +/* + * Default values for user and/or group using reserved blocks + */ +#define EXT2_DEF_RESUID 0 +#define EXT2_DEF_RESGID 0 + +/* + * Default mount options + */ +#define EXT2_DEFM_DEBUG 0x0001 +#define EXT2_DEFM_BSDGROUPS 0x0002 +#define EXT2_DEFM_XATTR_USER 0x0004 +#define EXT2_DEFM_ACL 0x0008 +#define EXT2_DEFM_UID16 0x0010 + /* Not used by ext2, but reserved for use by ext3 */ +#define EXT3_DEFM_JMODE 0x0060 +#define EXT3_DEFM_JMODE_DATA 0x0020 +#define EXT3_DEFM_JMODE_ORDERED 0x0040 +#define EXT3_DEFM_JMODE_WBACK 0x0060 + +/* + * Structure of a directory entry + */ + +struct ext2_dir_entry { + __le32 inode; /* Inode number */ + __le16 rec_len; /* Directory entry length */ + __le16 name_len; /* Name length */ + char name[]; /* File name, up to EXT2_NAME_LEN */ +}; + +/* + * The new version of the directory entry. Since EXT2 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 ext2_dir_entry_2 { + __le32 inode; /* Inode number */ + __le16 rec_len; /* Directory entry length */ + __u8 name_len; /* Name length */ + __u8 file_type; + char name[]; /* File name, up to EXT2_NAME_LEN */ +}; + +/* + * EXT2_DIR_PAD defines the directory entries boundaries + * + * NOTE: It must be a multiple of 4 + */ +#define EXT2_DIR_PAD 4 +#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) +#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ + ~EXT2_DIR_ROUND) +#define EXT2_MAX_REC_LEN ((1<<16)-1) + +static inline void verify_offsets(void) +{ +#define A(x,y) BUILD_BUG_ON(x != offsetof(struct ext2_super_block, y)); + A(EXT2_SB_MAGIC_OFFSET, s_magic); + A(EXT2_SB_BLOCKS_OFFSET, s_blocks_count); + A(EXT2_SB_BSIZE_OFFSET, s_log_block_size); +#undef A +} + +/* + * ext2 mount options + */ +struct ext2_mount_options { + unsigned long s_mount_opt; + kuid_t s_resuid; + kgid_t s_resgid; +}; + +/* + * second extended file system inode data in memory + */ +struct ext2_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 ext2_block_alloc_info *i_block_alloc_info; + + __u32 i_dir_start_lookup; +#ifdef CONFIG_EXT2_FS_XATTR + /* + * Extended attributes can be read independently of the main file + * data. Taking i_mutex even when reading would cause contention + * between readers of EAs and writers of regular file data, so + * instead we synchronize on xattr_sem when reading or changing + * EAs. + */ + struct rw_semaphore xattr_sem; +#endif + rwlock_t i_meta_lock; + + /* + * truncate_mutex is for serialising ext2_truncate() against + * ext2_getblock(). It also protects the internals of the inode's + * reservation data structures: ext2_reserve_window and + * ext2_reserve_window_node. + */ + struct mutex truncate_mutex; + struct inode vfs_inode; + struct list_head i_orphan; /* unlinked but open inodes */ +#ifdef CONFIG_QUOTA + struct dquot *i_dquot[MAXQUOTAS]; +#endif +}; + +/* + * Inode dynamic state flags + */ +#define EXT2_STATE_NEW 0x00000001 /* inode is newly created */ + + +/* + * Function prototypes + */ + +/* + * Ok, these declarations are also in <linux/kernel.h> but none of the + * ext2 source programs needs to include it so they are duplicated here. + */ + +static inline struct ext2_inode_info *EXT2_I(struct inode *inode) +{ + return container_of(inode, struct ext2_inode_info, vfs_inode); +} + +/* balloc.c */ +extern int ext2_bg_has_super(struct super_block *sb, int group); +extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group); +extern ext2_fsblk_t ext2_new_blocks(struct inode *, ext2_fsblk_t, + unsigned long *, int *, unsigned int); +extern int ext2_data_block_valid(struct ext2_sb_info *sbi, ext2_fsblk_t start_blk, + unsigned int count); +extern void ext2_free_blocks(struct inode *, ext2_fsblk_t, unsigned long); +extern unsigned long ext2_count_free_blocks (struct super_block *); +extern unsigned long ext2_count_dirs (struct super_block *); +extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb, + unsigned int block_group, + struct buffer_head ** bh); +extern void ext2_discard_reservation (struct inode *); +extern int ext2_should_retry_alloc(struct super_block *sb, int *retries); +extern void ext2_init_block_alloc_info(struct inode *); +extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv); + +/* dir.c */ +extern int ext2_add_link (struct dentry *, struct inode *); +extern int ext2_inode_by_name(struct inode *dir, + const struct qstr *child, ino_t *ino); +extern int ext2_make_empty(struct inode *, struct inode *); +extern struct ext2_dir_entry_2 *ext2_find_entry(struct inode *, const struct qstr *, + struct page **); +extern int ext2_delete_entry(struct ext2_dir_entry_2 *dir, struct page *page); +extern int ext2_empty_dir (struct inode *); +extern struct ext2_dir_entry_2 *ext2_dotdot(struct inode *dir, struct page **p); +int ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de, + struct page *page, struct inode *inode, bool update_times); +static inline void ext2_put_page(struct page *page, void *page_addr) +{ + kunmap_local(page_addr); + put_page(page); +} + +/* ialloc.c */ +extern struct inode * ext2_new_inode (struct inode *, umode_t, const struct qstr *); +extern void ext2_free_inode (struct inode *); +extern unsigned long ext2_count_free_inodes (struct super_block *); +extern unsigned long ext2_count_free (struct buffer_head *, unsigned); + +/* inode.c */ +extern struct inode *ext2_iget (struct super_block *, unsigned long); +extern int ext2_write_inode (struct inode *, struct writeback_control *); +extern void ext2_evict_inode(struct inode *); +void ext2_write_failed(struct address_space *mapping, loff_t to); +extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int); +extern int ext2_setattr (struct mnt_idmap *, struct dentry *, struct iattr *); +extern int ext2_getattr (struct mnt_idmap *, const struct path *, + struct kstat *, u32, unsigned int); +extern void ext2_set_inode_flags(struct inode *inode); +extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, + u64 start, u64 len); + +/* ioctl.c */ +extern int ext2_fileattr_get(struct dentry *dentry, struct fileattr *fa); +extern int ext2_fileattr_set(struct mnt_idmap *idmap, + struct dentry *dentry, struct fileattr *fa); +extern long ext2_ioctl(struct file *, unsigned int, unsigned long); +extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long); + +/* namei.c */ +struct dentry *ext2_get_parent(struct dentry *child); + +/* super.c */ +extern __printf(3, 4) +void ext2_error(struct super_block *, const char *, const char *, ...); +extern __printf(3, 4) +void ext2_msg(struct super_block *, const char *, const char *, ...); +extern void ext2_update_dynamic_rev (struct super_block *sb); +extern void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, + int wait); + +/* + * Inodes and files operations + */ + +/* dir.c */ +extern const struct file_operations ext2_dir_operations; + +/* file.c */ +extern int ext2_fsync(struct file *file, loff_t start, loff_t end, + int datasync); +extern const struct inode_operations ext2_file_inode_operations; +extern const struct file_operations ext2_file_operations; + +/* inode.c */ +extern void ext2_set_file_ops(struct inode *inode); +extern const struct address_space_operations ext2_aops; +extern const struct iomap_ops ext2_iomap_ops; + +/* namei.c */ +extern const struct inode_operations ext2_dir_inode_operations; +extern const struct inode_operations ext2_special_inode_operations; + +/* symlink.c */ +extern const struct inode_operations ext2_fast_symlink_inode_operations; +extern const struct inode_operations ext2_symlink_inode_operations; + +static inline ext2_fsblk_t +ext2_group_first_block_no(struct super_block *sb, unsigned long group_no) +{ + return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) + + le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block); +} + +static inline ext2_fsblk_t +ext2_group_last_block_no(struct super_block *sb, unsigned long group_no) +{ + struct ext2_sb_info *sbi = EXT2_SB(sb); + + if (group_no == sbi->s_groups_count - 1) + return le32_to_cpu(sbi->s_es->s_blocks_count) - 1; + else + return ext2_group_first_block_no(sb, group_no) + + EXT2_BLOCKS_PER_GROUP(sb) - 1; +} + +#define ext2_set_bit __test_and_set_bit_le +#define ext2_clear_bit __test_and_clear_bit_le +#define ext2_test_bit test_bit_le +#define ext2_find_first_zero_bit find_first_zero_bit_le +#define ext2_find_next_zero_bit find_next_zero_bit_le |