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linux/fs/ocfs2/ocfs2_fs.h
Sunil Mushran 2fbe8d1ebe ocfs2: Local alloc window size changeable via mount option 
Local alloc is a performance optimization in ocfs2 in which a node
takes a window of bits from the global bitmap and then uses that for
all small local allocations. This window size is fixed to 8MB currently.
This patch allows users to specify the window size in MB including
disabling it by passing in 0. If the number specified is too large,
the fs will use the default value of 8MB.

mount -o localalloc=X /dev/sdX /mntpoint

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
2008-01-25 15:05:43 -08:00

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/* -*- 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 OCFS2_FEATURE_COMPAT_BACKUP_SB
#define OCFS2_FEATURE_INCOMPAT_SUPP (OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \
| OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC \
| OCFS2_FEATURE_INCOMPAT_INLINE_DATA)
#define OCFS2_FEATURE_RO_COMPAT_SUPP OCFS2_FEATURE_RO_COMPAT_UNWRITTEN
/*
* 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
/*
* tunefs sets this incompat flag before starting the resize and clears it
* at the end. This flag protects users from inadvertently mounting the fs
* after an aborted run without fsck-ing.
*/
#define OCFS2_FEATURE_INCOMPAT_RESIZE_INPROG 0x0004
/* Used to denote a non-clustered volume */
#define OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT 0x0008
/* Support for sparse allocation in b-trees */
#define OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC 0x0010
/*
* Tunefs sets this incompat flag before starting an operation which
* would require cleanup on abort. This is done to protect users from
* inadvertently mounting the fs after an aborted run without
* fsck-ing.
*
* s_tunefs_flags on the super block describes precisely which
* operations were in progress.
*/
#define OCFS2_FEATURE_INCOMPAT_TUNEFS_INPROG 0x0020
/* Support for data packed into inode blocks */
#define OCFS2_FEATURE_INCOMPAT_INLINE_DATA 0x0040
/*
* backup superblock flag is used to indicate that this volume
* has backup superblocks.
*/
#define OCFS2_FEATURE_COMPAT_BACKUP_SB 0x0001
/*
* Unwritten extents support.
*/
#define OCFS2_FEATURE_RO_COMPAT_UNWRITTEN 0x0001
/* The byte offset of the first backup block will be 1G.
* The following will be 4G, 16G, 64G, 256G and 1T.
*/
#define OCFS2_BACKUP_SB_START 1 << 30
/* the max backup superblock nums */
#define OCFS2_MAX_BACKUP_SUPERBLOCKS 6
/*
* Flags on ocfs2_super_block.s_tunefs_flags
*/
#define OCFS2_TUNEFS_INPROG_REMOVE_SLOT 0x0001 /* Removing slots */
/*
* 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 */
/*
* Flags on ocfs2_dinode.i_dyn_features
*
* These can change much more often than i_flags. When adding flags,
* keep in mind that i_dyn_features is only 16 bits wide.
*/
#define OCFS2_INLINE_DATA_FL (0x0001) /* Data stored in inode block */
#define OCFS2_HAS_XATTR_FL (0x0002)
#define OCFS2_INLINE_XATTR_FL (0x0004)
#define OCFS2_INDEXED_DIR_FL (0x0008)
/* Inode attributes, keep in sync with EXT2 */
#define OCFS2_SECRM_FL (0x00000001) /* Secure deletion */
#define OCFS2_UNRM_FL (0x00000002) /* Undelete */
#define OCFS2_COMPR_FL (0x00000004) /* Compress file */
#define OCFS2_SYNC_FL (0x00000008) /* Synchronous updates */
#define OCFS2_IMMUTABLE_FL (0x00000010) /* Immutable file */
#define OCFS2_APPEND_FL (0x00000020) /* writes to file may only append */
#define OCFS2_NODUMP_FL (0x00000040) /* do not dump file */
#define OCFS2_NOATIME_FL (0x00000080) /* do not update atime */
#define OCFS2_DIRSYNC_FL (0x00010000) /* dirsync behaviour (directories only) */
#define OCFS2_FL_VISIBLE (0x000100FF) /* User visible flags */
#define OCFS2_FL_MODIFIABLE (0x000100FF) /* User modifiable flags */
/*
* Extent record flags (e_node.leaf.flags)
*/
#define OCFS2_EXT_UNWRITTEN (0x01) /* Extent is allocated but
* unwritten */
/*
* ioctl commands
*/
#define OCFS2_IOC_GETFLAGS _IOR('f', 1, long)
#define OCFS2_IOC_SETFLAGS _IOW('f', 2, long)
#define OCFS2_IOC32_GETFLAGS _IOR('f', 1, int)
#define OCFS2_IOC32_SETFLAGS _IOW('f', 2, int)
/*
* Space reservation / allocation / free ioctls and argument structure
* are designed to be compatible with XFS.
*
* ALLOCSP* and FREESP* are not and will never be supported, but are
* included here for completeness.
*/
struct ocfs2_space_resv {
__s16 l_type;
__s16 l_whence;
__s64 l_start;
__s64 l_len; /* len == 0 means until end of file */
__s32 l_sysid;
__u32 l_pid;
__s32 l_pad[4]; /* reserve area */
};
#define OCFS2_IOC_ALLOCSP _IOW ('X', 10, struct ocfs2_space_resv)
#define OCFS2_IOC_FREESP _IOW ('X', 11, struct ocfs2_space_resv)
#define OCFS2_IOC_RESVSP _IOW ('X', 40, struct ocfs2_space_resv)
#define OCFS2_IOC_UNRESVSP _IOW ('X', 41, struct ocfs2_space_resv)
#define OCFS2_IOC_ALLOCSP64 _IOW ('X', 36, struct ocfs2_space_resv)
#define OCFS2_IOC_FREESP64 _IOW ('X', 37, struct ocfs2_space_resv)
#define OCFS2_IOC_RESVSP64 _IOW ('X', 42, struct ocfs2_space_resv)
#define OCFS2_IOC_UNRESVSP64 _IOW ('X', 43, struct ocfs2_space_resv)
/* Used to pass group descriptor data when online resize is done */
struct ocfs2_new_group_input {
__u64 group; /* Group descriptor's blkno. */
__u32 clusters; /* Total number of clusters in this group */
__u32 frees; /* Total free clusters in this group */
__u16 chain; /* Chain for this group */
__u16 reserved1;
__u32 reserved2;
};
#define OCFS2_IOC_GROUP_EXTEND _IOW('o', 1, int)
#define OCFS2_IOC_GROUP_ADD _IOW('o', 2,struct ocfs2_new_group_input)
#define OCFS2_IOC_GROUP_ADD64 _IOW('o', 3,struct ocfs2_new_group_input)
/*
* 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)
/*
* Default local alloc size (in megabytes)
*
* The value chosen should be such that most allocations, including new
* block groups, use local alloc.
*/
#define OCFS2_DEFAULT_LOCAL_ALLOC_SIZE 8
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.
*
* Length fields are divided into interior and leaf node versions.
* This leaves room for a flags field (OCFS2_EXT_*) in the leaf nodes.
*/
struct ocfs2_extent_rec {
/*00*/ __le32 e_cpos; /* Offset into the file, in clusters */
union {
__le32 e_int_clusters; /* Clusters covered by all children */
struct {
__le16 e_leaf_clusters; /* Clusters covered by this
extent */
__u8 e_reserved1;
__u8 e_flags; /* Extent flags */
};
};
__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)
NOTE: The high 8 bits cannot be
used - tree_depth is never that big.
*/
__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_tunefs_flag;
__le32 s_reserved1;
__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];
};
/*
* Data-in-inode header. This is only used if i_dyn_features has
* OCFS2_INLINE_DATA_FL set.
*/
struct ocfs2_inline_data
{
/*00*/ __le16 id_count; /* Number of bytes that can be used
* for data, starting at id_data */
__le16 id_reserved0;
__le32 id_reserved1;
__u8 id_data[0]; /* Start of user data */
};
/*
* 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;
__le32 i_attr;
__le16 i_orphaned_slot; /* Only valid when OCFS2_ORPHANED_FL
was set in i_flags */
__le16 i_dyn_features;
/*70*/ __le64 i_reserved2[8];
/*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;
struct ocfs2_inline_data i_data;
__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_max_inline_data(struct super_block *sb)
{
return sb->s_blocksize -
offsetof(struct ocfs2_dinode, id2.i_data.id_data);
}
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);
}
static inline u64 ocfs2_backup_super_blkno(struct super_block *sb, int index)
{
u64 offset = OCFS2_BACKUP_SB_START;
if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
offset <<= (2 * index);
offset >>= sb->s_blocksize_bits;
return offset;
}
return 0;
}
#else
static inline int ocfs2_fast_symlink_chars(int blocksize)
{
return blocksize - offsetof(struct ocfs2_dinode, id2.i_symlink);
}
static inline int ocfs2_max_inline_data(int blocksize)
{
return blocksize - offsetof(struct ocfs2_dinode, id2.i_data.id_data);
}
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);
}
static inline uint64_t ocfs2_backup_super_blkno(int blocksize, int index)
{
uint64_t offset = OCFS2_BACKUP_SB_START;
if (index >= 0 && index < OCFS2_MAX_BACKUP_SUPERBLOCKS) {
offset <<= (2 * index);
offset /= blocksize;
return offset;
}
return 0;
}
#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 */
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