[PATCH] OCFS2: The Second Oracle Cluster Filesystem

The OCFS2 file system module.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>

1 files changed, 638 insertions, 0 deletions

diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h
new file mode 100644
index 000000000000..dfb8a5bedfc8
--- /dev/null
+++ b/fs/ocfs2/ocfs2_fs.h
@@ -0,0 +1,638 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * ocfs2_fs.h
+ *
+ * On-disk structures for OCFS2.
+ *
+ * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License, version 2,  as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#ifndef _OCFS2_FS_H
+#define _OCFS2_FS_H
+
+/* Version */
+#define OCFS2_MAJOR_REV_LEVEL           0
+#define OCFS2_MINOR_REV_LEVEL           90
+
+/*
+ * An OCFS2 volume starts this way:
+ * Sector 0: Valid ocfs1_vol_disk_hdr that cleanly fails to mount OCFS.
+ * Sector 1: Valid ocfs1_vol_label that cleanly fails to mount OCFS.
+ * Block OCFS2_SUPER_BLOCK_BLKNO: OCFS2 superblock.
+ *
+ * All other structures are found from the superblock information.
+ *
+ * OCFS2_SUPER_BLOCK_BLKNO is in blocks, not sectors.  eg, for a
+ * blocksize of 2K, it is 4096 bytes into disk.
+ */
+#define OCFS2_SUPER_BLOCK_BLKNO         2
+
+/*
+ * Cluster size limits. The maximum is kept arbitrarily at 1 MB, and could
+ * grow if needed.
+ */
+#define OCFS2_MIN_CLUSTERSIZE           4096
+#define OCFS2_MAX_CLUSTERSIZE           1048576
+
+/*
+ * Blocks cannot be bigger than clusters, so the maximum blocksize is the
+ * minimum cluster size.
+ */
+#define OCFS2_MIN_BLOCKSIZE             512
+#define OCFS2_MAX_BLOCKSIZE             OCFS2_MIN_CLUSTERSIZE
+
+/* Filesystem magic number */
+#define OCFS2_SUPER_MAGIC               0x7461636f
+
+/* Object signatures */
+#define OCFS2_SUPER_BLOCK_SIGNATURE     "OCFSV2"
+#define OCFS2_INODE_SIGNATURE           "INODE01"
+#define OCFS2_EXTENT_BLOCK_SIGNATURE    "EXBLK01"
+#define OCFS2_GROUP_DESC_SIGNATURE      "GROUP01"
+
+/* Compatibility flags */
+#define OCFS2_HAS_COMPAT_FEATURE(sb,mask)                       \
+        ( OCFS2_SB(sb)->s_feature_compat & (mask) )
+#define OCFS2_HAS_RO_COMPAT_FEATURE(sb,mask)                    \
+        ( OCFS2_SB(sb)->s_feature_ro_compat & (mask) )
+#define OCFS2_HAS_INCOMPAT_FEATURE(sb,mask)                     \
+        ( OCFS2_SB(sb)->s_feature_incompat & (mask) )
+#define OCFS2_SET_COMPAT_FEATURE(sb,mask)                       \
+        OCFS2_SB(sb)->s_feature_compat |= (mask)
+#define OCFS2_SET_RO_COMPAT_FEATURE(sb,mask)                    \
+        OCFS2_SB(sb)->s_feature_ro_compat |= (mask)
+#define OCFS2_SET_INCOMPAT_FEATURE(sb,mask)                     \
+        OCFS2_SB(sb)->s_feature_incompat |= (mask)
+#define OCFS2_CLEAR_COMPAT_FEATURE(sb,mask)                     \
+        OCFS2_SB(sb)->s_feature_compat &= ~(mask)
+#define OCFS2_CLEAR_RO_COMPAT_FEATURE(sb,mask)                  \
+        OCFS2_SB(sb)->s_feature_ro_compat &= ~(mask)
+#define OCFS2_CLEAR_INCOMPAT_FEATURE(sb,mask)                   \
+        OCFS2_SB(sb)->s_feature_incompat &= ~(mask)
+
+#define OCFS2_FEATURE_COMPAT_SUPP       0
+#define OCFS2_FEATURE_INCOMPAT_SUPP     0
+#define OCFS2_FEATURE_RO_COMPAT_SUPP    0
+
+/*
+ * Heartbeat-only devices are missing journals and other files.  The
+ * filesystem driver can't load them, but the library can.  Never put
+ * this in OCFS2_FEATURE_INCOMPAT_SUPP, *ever*.
+ */
+#define OCFS2_FEATURE_INCOMPAT_HEARTBEAT_DEV    0x0002
+
+
+/*
+ * Flags on ocfs2_dinode.i_flags
+ */
+#define OCFS2_VALID_FL          (0x00000001)    /* Inode is valid */
+#define OCFS2_UNUSED2_FL        (0x00000002)
+#define OCFS2_ORPHANED_FL       (0x00000004)    /* On the orphan list */
+#define OCFS2_UNUSED3_FL        (0x00000008)
+/* System inode flags */
+#define OCFS2_SYSTEM_FL         (0x00000010)    /* System inode */
+#define OCFS2_SUPER_BLOCK_FL    (0x00000020)    /* Super block */
+#define OCFS2_LOCAL_ALLOC_FL    (0x00000040)    /* Slot local alloc bitmap */
+#define OCFS2_BITMAP_FL         (0x00000080)    /* Allocation bitmap */
+#define OCFS2_JOURNAL_FL        (0x00000100)    /* Slot local journal */
+#define OCFS2_HEARTBEAT_FL      (0x00000200)    /* Heartbeat area */
+#define OCFS2_CHAIN_FL          (0x00000400)    /* Chain allocator */
+#define OCFS2_DEALLOC_FL        (0x00000800)    /* Truncate log */
+
+/*
+ * Journal Flags (ocfs2_dinode.id1.journal1.i_flags)
+ */
+#define OCFS2_JOURNAL_DIRTY_FL  (0x00000001)    /* Journal needs recovery */
+
+/*
+ * superblock s_state flags
+ */
+#define OCFS2_ERROR_FS          (0x00000001)    /* FS saw errors */
+
+/* Limit of space in ocfs2_dir_entry */
+#define OCFS2_MAX_FILENAME_LEN          255
+
+/* Maximum slots on an ocfs2 file system */
+#define OCFS2_MAX_SLOTS                 255
+
+/* Slot map indicator for an empty slot */
+#define OCFS2_INVALID_SLOT              -1
+
+#define OCFS2_VOL_UUID_LEN              16
+#define OCFS2_MAX_VOL_LABEL_LEN         64
+
+/* Journal limits (in bytes) */
+#define OCFS2_MIN_JOURNAL_SIZE          (4 * 1024 * 1024)
+#define OCFS2_MAX_JOURNAL_SIZE          (500 * 1024 * 1024)
+
+struct ocfs2_system_inode_info {
+        char    *si_name;
+        int     si_iflags;
+        int     si_mode;
+};
+
+/* System file index */
+enum {
+        BAD_BLOCK_SYSTEM_INODE = 0,
+        GLOBAL_INODE_ALLOC_SYSTEM_INODE,
+        SLOT_MAP_SYSTEM_INODE,
+#define OCFS2_FIRST_ONLINE_SYSTEM_INODE SLOT_MAP_SYSTEM_INODE
+        HEARTBEAT_SYSTEM_INODE,
+        GLOBAL_BITMAP_SYSTEM_INODE,
+#define OCFS2_LAST_GLOBAL_SYSTEM_INODE GLOBAL_BITMAP_SYSTEM_INODE
+        ORPHAN_DIR_SYSTEM_INODE,
+        EXTENT_ALLOC_SYSTEM_INODE,
+        INODE_ALLOC_SYSTEM_INODE,
+        JOURNAL_SYSTEM_INODE,
+        LOCAL_ALLOC_SYSTEM_INODE,
+        TRUNCATE_LOG_SYSTEM_INODE,
+        NUM_SYSTEM_INODES
+};
+
+static struct ocfs2_system_inode_info ocfs2_system_inodes[NUM_SYSTEM_INODES] = {
+        /* Global system inodes (single copy) */
+        /* The first two are only used from userspace mfks/tunefs */
+        [BAD_BLOCK_SYSTEM_INODE]                = { "bad_blocks", 0, S_IFREG | 0644 },
+        [GLOBAL_INODE_ALLOC_SYSTEM_INODE]       = { "global_inode_alloc", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
+
+        /* These are used by the running filesystem */
+        [SLOT_MAP_SYSTEM_INODE]                 = { "slot_map", 0, S_IFREG | 0644 },
+        [HEARTBEAT_SYSTEM_INODE]                = { "heartbeat", OCFS2_HEARTBEAT_FL, S_IFREG | 0644 },
+        [GLOBAL_BITMAP_SYSTEM_INODE]            = { "global_bitmap", 0, S_IFREG | 0644 },
+
+        /* Slot-specific system inodes (one copy per slot) */
+        [ORPHAN_DIR_SYSTEM_INODE]               = { "orphan_dir:%04d", 0, S_IFDIR | 0755 },
+        [EXTENT_ALLOC_SYSTEM_INODE]             = { "extent_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
+        [INODE_ALLOC_SYSTEM_INODE]              = { "inode_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_CHAIN_FL, S_IFREG | 0644 },
+        [JOURNAL_SYSTEM_INODE]                  = { "journal:%04d", OCFS2_JOURNAL_FL, S_IFREG | 0644 },
+        [LOCAL_ALLOC_SYSTEM_INODE]              = { "local_alloc:%04d", OCFS2_BITMAP_FL | OCFS2_LOCAL_ALLOC_FL, S_IFREG | 0644 },
+        [TRUNCATE_LOG_SYSTEM_INODE]             = { "truncate_log:%04d", OCFS2_DEALLOC_FL, S_IFREG | 0644 }
+};
+
+/* Parameter passed from mount.ocfs2 to module */
+#define OCFS2_HB_NONE                   "heartbeat=none"
+#define OCFS2_HB_LOCAL                  "heartbeat=local"
+
+/*
+ * OCFS2 directory file types.  Only the low 3 bits are used.  The
+ * other bits are reserved for now.
+ */
+#define OCFS2_FT_UNKNOWN        0
+#define OCFS2_FT_REG_FILE       1
+#define OCFS2_FT_DIR            2
+#define OCFS2_FT_CHRDEV         3
+#define OCFS2_FT_BLKDEV         4
+#define OCFS2_FT_FIFO           5
+#define OCFS2_FT_SOCK           6
+#define OCFS2_FT_SYMLINK        7
+
+#define OCFS2_FT_MAX            8
+
+/*
+ * OCFS2_DIR_PAD defines the directory entries boundaries
+ *
+ * NOTE: It must be a multiple of 4
+ */
+#define OCFS2_DIR_PAD                   4
+#define OCFS2_DIR_ROUND                 (OCFS2_DIR_PAD - 1)
+#define OCFS2_DIR_MEMBER_LEN            offsetof(struct ocfs2_dir_entry, name)
+#define OCFS2_DIR_REC_LEN(name_len)     (((name_len) + OCFS2_DIR_MEMBER_LEN + \
+                                          OCFS2_DIR_ROUND) & \
+                                         ~OCFS2_DIR_ROUND)
+
+#define OCFS2_LINK_MAX          32000
+
+#define S_SHIFT                 12
+static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
+        [S_IFREG >> S_SHIFT]  = OCFS2_FT_REG_FILE,
+        [S_IFDIR >> S_SHIFT]  = OCFS2_FT_DIR,
+        [S_IFCHR >> S_SHIFT]  = OCFS2_FT_CHRDEV,
+        [S_IFBLK >> S_SHIFT]  = OCFS2_FT_BLKDEV,
+        [S_IFIFO >> S_SHIFT]  = OCFS2_FT_FIFO,
+        [S_IFSOCK >> S_SHIFT] = OCFS2_FT_SOCK,
+        [S_IFLNK >> S_SHIFT]  = OCFS2_FT_SYMLINK,
+};
+
+
+/*
+ * Convenience casts
+ */
+#define OCFS2_RAW_SB(dinode)            (&((dinode)->id2.i_super))
+
+/*
+ * On disk extent record for OCFS2
+ * It describes a range of clusters on disk.
+ */
+struct ocfs2_extent_rec {
+/*00*/  __le32 e_cpos;          /* Offset into the file, in clusters */
+        __le32 e_clusters;      /* Clusters covered by this extent */
+        __le64 e_blkno;         /* Physical disk offset, in blocks */
+/*10*/
+};
+
+struct ocfs2_chain_rec {
+        __le32 c_free;  /* Number of free bits in this chain. */
+        __le32 c_total; /* Number of total bits in this chain */
+        __le64 c_blkno; /* Physical disk offset (blocks) of 1st group */
+};
+
+struct ocfs2_truncate_rec {
+        __le32 t_start;         /* 1st cluster in this log */
+        __le32 t_clusters;      /* Number of total clusters covered */
+};
+
+/*
+ * On disk extent list for OCFS2 (node in the tree).  Note that this
+ * is contained inside ocfs2_dinode or ocfs2_extent_block, so the
+ * offsets are relative to ocfs2_dinode.id2.i_list or
+ * ocfs2_extent_block.h_list, respectively.
+ */
+struct ocfs2_extent_list {
+/*00*/  __le16 l_tree_depth;            /* Extent tree depth from this
+                                           point.  0 means data extents
+                                           hang directly off this
+                                           header (a leaf) */
+        __le16 l_count;                 /* Number of extent records */
+        __le16 l_next_free_rec;         /* Next unused extent slot */
+        __le16 l_reserved1;
+        __le64 l_reserved2;             /* Pad to
+                                           sizeof(ocfs2_extent_rec) */
+/*10*/  struct ocfs2_extent_rec l_recs[0];      /* Extent records */
+};
+
+/*
+ * On disk allocation chain list for OCFS2.  Note that this is
+ * contained inside ocfs2_dinode, so the offsets are relative to
+ * ocfs2_dinode.id2.i_chain.
+ */
+struct ocfs2_chain_list {
+/*00*/  __le16 cl_cpg;                  /* Clusters per Block Group */
+        __le16 cl_bpc;                  /* Bits per cluster */
+        __le16 cl_count;                /* Total chains in this list */
+        __le16 cl_next_free_rec;        /* Next unused chain slot */
+        __le64 cl_reserved1;
+/*10*/  struct ocfs2_chain_rec cl_recs[0];      /* Chain records */
+};
+
+/*
+ * On disk deallocation log for OCFS2.  Note that this is
+ * contained inside ocfs2_dinode, so the offsets are relative to
+ * ocfs2_dinode.id2.i_dealloc.
+ */
+struct ocfs2_truncate_log {
+/*00*/  __le16 tl_count;                /* Total records in this log */
+        __le16 tl_used;                 /* Number of records in use */
+        __le32 tl_reserved1;
+/*08*/  struct ocfs2_truncate_rec tl_recs[0];   /* Truncate records */
+};
+
+/*
+ * On disk extent block (indirect block) for OCFS2
+ */
+struct ocfs2_extent_block
+{
+/*00*/  __u8 h_signature[8];            /* Signature for verification */
+        __le64 h_reserved1;
+/*10*/  __le16 h_suballoc_slot;         /* Slot suballocator this
+                                           extent_header belongs to */
+        __le16 h_suballoc_bit;          /* Bit offset in suballocator
+                                           block group */
+        __le32 h_fs_generation;         /* Must match super block */
+        __le64 h_blkno;                 /* Offset on disk, in blocks */
+/*20*/  __le64 h_reserved3;
+        __le64 h_next_leaf_blk;         /* Offset on disk, in blocks,
+                                           of next leaf header pointing
+                                           to data */
+/*30*/  struct ocfs2_extent_list h_list;        /* Extent record list */
+/* Actual on-disk size is one block */
+};
+
+/*
+ * On disk superblock for OCFS2
+ * Note that it is contained inside an ocfs2_dinode, so all offsets
+ * are relative to the start of ocfs2_dinode.id2.
+ */
+struct ocfs2_super_block {
+/*00*/  __le16 s_major_rev_level;
+        __le16 s_minor_rev_level;
+        __le16 s_mnt_count;
+        __le16 s_max_mnt_count;
+        __le16 s_state;                 /* File system state */
+        __le16 s_errors;                        /* Behaviour when detecting errors */
+        __le32 s_checkinterval;         /* Max time between checks */
+/*10*/  __le64 s_lastcheck;             /* Time of last check */
+        __le32 s_creator_os;            /* OS */
+        __le32 s_feature_compat;                /* Compatible feature set */
+/*20*/  __le32 s_feature_incompat;      /* Incompatible feature set */
+        __le32 s_feature_ro_compat;     /* Readonly-compatible feature set */
+        __le64 s_root_blkno;            /* Offset, in blocks, of root directory
+                                           dinode */
+/*30*/  __le64 s_system_dir_blkno;      /* Offset, in blocks, of system
+                                           directory dinode */
+        __le32 s_blocksize_bits;                /* Blocksize for this fs */
+        __le32 s_clustersize_bits;      /* Clustersize for this fs */
+/*40*/  __le16 s_max_slots;             /* Max number of simultaneous mounts
+                                           before tunefs required */
+        __le16 s_reserved1;
+        __le32 s_reserved2;
+        __le64 s_first_cluster_group;   /* Block offset of 1st cluster
+                                         * group header */
+/*50*/  __u8  s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */
+/*90*/  __u8  s_uuid[OCFS2_VOL_UUID_LEN];       /* 128-bit uuid */
+/*A0*/
+};
+
+/*
+ * Local allocation bitmap for OCFS2 slots
+ * Note that it exists inside an ocfs2_dinode, so all offsets are
+ * relative to the start of ocfs2_dinode.id2.
+ */
+struct ocfs2_local_alloc
+{
+/*00*/  __le32 la_bm_off;       /* Starting bit offset in main bitmap */
+        __le16 la_size;         /* Size of included bitmap, in bytes */
+        __le16 la_reserved1;
+        __le64 la_reserved2;
+/*10*/  __u8   la_bitmap[0];
+};
+
+/*
+ * On disk inode for OCFS2
+ */
+struct ocfs2_dinode {
+/*00*/  __u8 i_signature[8];            /* Signature for validation */
+        __le32 i_generation;            /* Generation number */
+        __le16 i_suballoc_slot;         /* Slot suballocator this inode
+                                           belongs to */
+        __le16 i_suballoc_bit;          /* Bit offset in suballocator
+                                           block group */
+/*10*/  __le32 i_reserved0;
+        __le32 i_clusters;              /* Cluster count */
+        __le32 i_uid;                   /* Owner UID */
+        __le32 i_gid;                   /* Owning GID */
+/*20*/  __le64 i_size;                  /* Size in bytes */
+        __le16 i_mode;                  /* File mode */
+        __le16 i_links_count;           /* Links count */
+        __le32 i_flags;                 /* File flags */
+/*30*/  __le64 i_atime;                 /* Access time */
+        __le64 i_ctime;                 /* Creation time */
+/*40*/  __le64 i_mtime;                 /* Modification time */
+        __le64 i_dtime;                 /* Deletion time */
+/*50*/  __le64 i_blkno;                 /* Offset on disk, in blocks */
+        __le64 i_last_eb_blk;           /* Pointer to last extent
+                                           block */
+/*60*/  __le32 i_fs_generation;         /* Generation per fs-instance */
+        __le32 i_atime_nsec;
+        __le32 i_ctime_nsec;
+        __le32 i_mtime_nsec;
+/*70*/  __le64 i_reserved1[9];
+/*B8*/  union {
+                __le64 i_pad1;          /* Generic way to refer to this
+                                           64bit union */
+                struct {
+                        __le64 i_rdev;  /* Device number */
+                } dev1;
+                struct {                /* Info for bitmap system
+                                           inodes */
+                        __le32 i_used;  /* Bits (ie, clusters) used  */
+                        __le32 i_total; /* Total bits (clusters)
+                                           available */
+                } bitmap1;
+                struct {                /* Info for journal system
+                                           inodes */
+                        __le32 ij_flags;        /* Mounted, version, etc. */
+                        __le32 ij_pad;
+                } journal1;
+        } id1;                          /* Inode type dependant 1 */
+/*C0*/  union {
+                struct ocfs2_super_block        i_super;
+                struct ocfs2_local_alloc        i_lab;
+                struct ocfs2_chain_list         i_chain;
+                struct ocfs2_extent_list        i_list;
+                struct ocfs2_truncate_log       i_dealloc;
+                __u8                            i_symlink[0];
+        } id2;
+/* Actual on-disk size is one block */
+};
+
+/*
+ * On-disk directory entry structure for OCFS2
+ *
+ * Packed as this structure could be accessed unaligned on 64-bit platforms
+ */
+struct ocfs2_dir_entry {
+/*00*/  __le64   inode;                  /* Inode number */
+        __le16   rec_len;                /* Directory entry length */
+        __u8    name_len;               /* Name length */
+        __u8    file_type;
+/*0C*/  char    name[OCFS2_MAX_FILENAME_LEN];   /* File name */
+/* Actual on-disk length specified by rec_len */
+} __attribute__ ((packed));
+
+/*
+ * On disk allocator group structure for OCFS2
+ */
+struct ocfs2_group_desc
+{
+/*00*/  __u8    bg_signature[8];        /* Signature for validation */
+        __le16   bg_size;                /* Size of included bitmap in
+                                           bytes. */
+        __le16   bg_bits;                /* Bits represented by this
+                                           group. */
+        __le16  bg_free_bits_count;     /* Free bits count */
+        __le16   bg_chain;               /* What chain I am in. */
+/*10*/  __le32   bg_generation;
+        __le32  bg_reserved1;
+        __le64   bg_next_group;          /* Next group in my list, in
+                                           blocks */
+/*20*/  __le64   bg_parent_dinode;       /* dinode which owns me, in
+                                           blocks */
+        __le64   bg_blkno;               /* Offset on disk, in blocks */
+/*30*/  __le64   bg_reserved2[2];
+/*40*/  __u8    bg_bitmap[0];
+};
+
+#ifdef __KERNEL__
+static inline int ocfs2_fast_symlink_chars(struct super_block *sb)
+{
+        return  sb->s_blocksize -
+                 offsetof(struct ocfs2_dinode, id2.i_symlink);
+}
+
+static inline int ocfs2_extent_recs_per_inode(struct super_block *sb)
+{
+        int size;
+
+        size = sb->s_blocksize -
+                offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
+
+        return size / sizeof(struct ocfs2_extent_rec);
+}
+
+static inline int ocfs2_chain_recs_per_inode(struct super_block *sb)
+{
+        int size;
+
+        size = sb->s_blocksize -
+                offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
+
+        return size / sizeof(struct ocfs2_chain_rec);
+}
+
+static inline u16 ocfs2_extent_recs_per_eb(struct super_block *sb)
+{
+        int size;
+
+        size = sb->s_blocksize -
+                offsetof(struct ocfs2_extent_block, h_list.l_recs);
+
+        return size / sizeof(struct ocfs2_extent_rec);
+}
+
+static inline u16 ocfs2_local_alloc_size(struct super_block *sb)
+{
+        u16 size;
+
+        size = sb->s_blocksize -
+                offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
+
+        return size;
+}
+
+static inline int ocfs2_group_bitmap_size(struct super_block *sb)
+{
+        int size;
+
+        size = sb->s_blocksize -
+                offsetof(struct ocfs2_group_desc, bg_bitmap);
+
+        return size;
+}
+
+static inline int ocfs2_truncate_recs_per_inode(struct super_block *sb)
+{
+        int size;
+
+        size = sb->s_blocksize -
+                offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
+
+        return size / sizeof(struct ocfs2_truncate_rec);
+}
+#else
+static inline int ocfs2_fast_symlink_chars(int blocksize)
+{
+        return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
+}
+
+static inline int ocfs2_extent_recs_per_inode(int blocksize)
+{
+        int size;
+
+        size = blocksize -
+                offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
+
+        return size / sizeof(struct ocfs2_extent_rec);
+}
+
+static inline int ocfs2_chain_recs_per_inode(int blocksize)
+{
+        int size;
+
+        size = blocksize -
+                offsetof(struct ocfs2_dinode, id2.i_chain.cl_recs);
+
+        return size / sizeof(struct ocfs2_chain_rec);
+}
+
+static inline int ocfs2_extent_recs_per_eb(int blocksize)
+{
+        int size;
+
+        size = blocksize -
+                offsetof(struct ocfs2_extent_block, h_list.l_recs);
+
+        return size / sizeof(struct ocfs2_extent_rec);
+}
+
+static inline int ocfs2_local_alloc_size(int blocksize)
+{
+        int size;
+
+        size = blocksize -
+                offsetof(struct ocfs2_dinode, id2.i_lab.la_bitmap);
+
+        return size;
+}
+
+static inline int ocfs2_group_bitmap_size(int blocksize)
+{
+        int size;
+
+        size = blocksize -
+                offsetof(struct ocfs2_group_desc, bg_bitmap);
+
+        return size;
+}
+
+static inline int ocfs2_truncate_recs_per_inode(int blocksize)
+{
+        int size;
+
+        size = blocksize -
+                offsetof(struct ocfs2_dinode, id2.i_dealloc.tl_recs);
+
+        return size / sizeof(struct ocfs2_truncate_rec);
+}
+#endif  /* __KERNEL__ */
+
+
+static inline int ocfs2_system_inode_is_global(int type)
+{
+        return ((type >= 0) &&
+                (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE));
+}
+
+static inline int ocfs2_sprintf_system_inode_name(char *buf, int len,
+                                                  int type, int slot)
+{
+        int chars;
+
+        /*
+         * Global system inodes can only have one copy.  Everything
+         * after OCFS2_LAST_GLOBAL_SYSTEM_INODE in the system inode
+         * list has a copy per slot.
+         */
+        if (type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE)
+                chars = snprintf(buf, len,
+                                 ocfs2_system_inodes[type].si_name);
+        else
+                chars = snprintf(buf, len,
+                                 ocfs2_system_inodes[type].si_name,
+                                 slot);
+
+        return chars;
+}
+
+static inline void ocfs2_set_de_type(struct ocfs2_dir_entry *de,
+                                    umode_t mode)
+{
+        de->file_type = ocfs2_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
+}
+
+#endif  /* _OCFS2_FS_H */
+