migrate ext2_fs.h guts to fs/ext2/ext2.h

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

4 files changed, 633 insertions, 10 deletions

diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index 75ad433c6691..0b2b4db5bdcd 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -1,5 +1,636 @@
+/*
+ * 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>
+
+/* 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 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.
+         */
+        ext2_fsblk_t            last_alloc_physical_block;
+};
+
+#define rsv_start rsv_window._rsv_start
+#define rsv_end rsv_window._rsv_end
+
+/*
+ * second extended-fs super-block data in memory
+ */
+struct ext2_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 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;
+        uid_t s_resuid;
+        gid_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;
+};
+
+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             4096
+#define EXT2_MIN_BLOCK_LOG_SIZE           10
+#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)
+
+/*
+ * Macro-instructions used to manage fragments
+ */
+#define EXT2_MIN_FRAG_SIZE              1024
+#define EXT2_MAX_FRAG_SIZE              4096
+#define EXT2_MIN_FRAG_LOG_SIZE            10
+#define EXT2_FRAG_SIZE(s)               (EXT2_SB(s)->s_frag_size)
+#define EXT2_FRAGS_PER_BLOCK(s)         (EXT2_SB(s)->s_frags_per_block)
+
+/*
+ * 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_GETFLAGS               FS_IOC_GETFLAGS
+#define EXT2_IOC_SETFLAGS               FS_IOC_SETFLAGS
+#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_GETFLAGS             FS_IOC32_GETFLAGS
+#define EXT2_IOC32_SETFLAGS             FS_IOC32_SETFLAGS
+#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_CHECK                0x000001  /* Do mount-time checks */
+#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  /* Execute in place */
+#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
+
+/*
+ * 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 directory file types.  Only the low 3 bits are used.  The
+ * other bits are reserved for now.
+ */
+enum {
+        EXT2_FT_UNKNOWN         = 0,
+        EXT2_FT_REG_FILE        = 1,
+        EXT2_FT_DIR             = 2,
+        EXT2_FT_CHRDEV          = 3,
+        EXT2_FT_BLKDEV          = 4,
+        EXT2_FT_FIFO            = 5,
+        EXT2_FT_SOCK            = 6,
+        EXT2_FT_SYMLINK         = 7,
+        EXT2_FT_MAX
+};
+
+/*
+ * 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
diff --git a/fs/ext2/xattr_security.c b/fs/ext2/xattr_security.c
index be7a8d02c9a7..cfedb2cb0d8c 100644
--- a/fs/ext2/xattr_security.c
+++ b/fs/ext2/xattr_security.c
@@ -3,10 +3,7 @@
  * Handler for storing security labels as extended attributes.
  */
 
-#include <linux/slab.h>
-#include <linux/string.h>
-#include <linux/fs.h>
-#include <linux/ext2_fs.h>
+#include "ext2.h"
 #include <linux/security.h>
 #include "xattr.h"
 
diff --git a/fs/ext2/xattr_trusted.c b/fs/ext2/xattr_trusted.c
index 2989467d3595..7e192574c001 100644
--- a/fs/ext2/xattr_trusted.c
+++ b/fs/ext2/xattr_trusted.c
@@ -5,10 +5,7 @@
  * Copyright (C) 2003 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
  */
 
-#include <linux/string.h>
-#include <linux/capability.h>
-#include <linux/fs.h>
-#include <linux/ext2_fs.h>
+#include "ext2.h"
 #include "xattr.h"
 
 static size_t
diff --git a/fs/ext2/xip.c b/fs/ext2/xip.c
index 322a56b2dfb1..1c3312858fcf 100644
--- a/fs/ext2/xip.c
+++ b/fs/ext2/xip.c
@@ -9,8 +9,6 @@
 #include <linux/fs.h>
 #include <linux/genhd.h>
 #include <linux/buffer_head.h>
-#include <linux/ext2_fs_sb.h>
-#include <linux/ext2_fs.h>
 #include <linux/blkdev.h>
 #include "ext2.h"
 #include "xip.h"