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linux/fs/ocfs2/ocfs2_fs.h
Heming Zhao 4eb7b93e03 ocfs2: improve write IO performance when fragmentation is high 
The group_search function ocfs2_cluster_group_search() should
bypass groups with insufficient space to avoid unnecessary
searches.

This patch is particularly useful when ocfs2 is handling huge
number small files, and volume fragmentation is very high.
In this case, ocfs2 is busy with looking up available la window
from //global_bitmap.

This patch introduces a new member in the Group Description (gd)
struct called 'bg_contig_free_bits', representing the max
contigous free bits in this gd. When ocfs2 allocates a new
la window from //global_bitmap, 'bg_contig_free_bits' helps
expedite the search process.

Let's image below path.

1. la state (->local_alloc_state) is set THROTTLED or DISABLED.

2. when user delete a large file and trigger
   ocfs2_local_alloc_seen_free_bits set osb->local_alloc_state
   unconditionally.

3. a write IOs thread run and trigger the worst performance path

```
ocfs2_reserve_clusters_with_limit
 ocfs2_reserve_local_alloc_bits
  ocfs2_local_alloc_slide_window //[1]
   + ocfs2_local_alloc_reserve_for_window //[2]
   + ocfs2_local_alloc_new_window //[3]
      ocfs2_recalc_la_window
```

[1]:
will be called when la window bits used up.

[2]:
under la state is ENABLED, and this func only check global_bitmap
free bits, it will succeed in general.

[3]:
will use the default la window size to search clusters then fail.
ocfs2_recalc_la_window attempts other la window sizes.
the timing complexity is O(n^4), resulting in a significant time
cost for scanning global bitmap. This leads to a dramatic slowdown
in write I/Os (e.g., user space 'dd').

i.e.
an ocfs2 partition size: 1.45TB, cluster size: 4KB,
la window default size: 106MB.
The partition is fragmentation by creating & deleting huge mount of
small files.

before this patch, the timing of [3] should be
(the number got from real world):
- la window size change order (size: MB):
  106, 53, 26.5, 13, 6.5, 3.25, 1.6, 0.8
  only 0.8MB succeed, 0.8MB also triggers la window to disable.
  ocfs2_local_alloc_new_window retries 8 times, first 7 times totally
  runs in worst case.
- group chain number: 242
  ocfs2_claim_suballoc_bits calls for-loop 242 times
- each chain has 49 block group
  ocfs2_search_chain calls while-loop 49 times
- each bg has 32256 blocks
  ocfs2_block_group_find_clear_bits calls while-loop for 32256 bits.
  for ocfs2_find_next_zero_bit uses ffz() to find zero bit, let's use
  (32256/64) (this is not worst value) for timing calucation.

the loop times: 7*242*49*(32256/64) = 41835024 (~42 million times)

In the worst case, user space writes 1MB data will trigger 42M scanning
times.

under this patch, the timing is '7*242*49 = 83006', reduced by three
orders of magnitude.

Link: https://lkml.kernel.org/r/20240328125203.20892-2-heming.zhao@suse.com
Signed-off-by: Heming Zhao <heming.zhao@suse.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Jun Piao <piaojun@huawei.com>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Mark Fasheh <mark@fasheh.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-04-25 21:07:03 -07:00

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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* ocfs2_fs.h
*
* On-disk structures for OCFS2.
*
* Copyright (C) 2002, 2004 Oracle. All rights reserved.
*/
#ifndef _OCFS2_FS_H
#define _OCFS2_FS_H
#include <linux/magic.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
/* 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"
#define OCFS2_XATTR_BLOCK_SIGNATURE "XATTR01"
#define OCFS2_DIR_TRAILER_SIGNATURE "DIRTRL1"
#define OCFS2_DX_ROOT_SIGNATURE "DXDIR01"
#define OCFS2_DX_LEAF_SIGNATURE "DXLEAF1"
#define OCFS2_REFCOUNT_BLOCK_SIGNATURE "REFCNT1"
/* 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 \
| OCFS2_FEATURE_COMPAT_JBD2_SB)
#define OCFS2_FEATURE_INCOMPAT_SUPP (OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT \
| OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC \
| OCFS2_FEATURE_INCOMPAT_INLINE_DATA \
| OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP \
| OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK \
| OCFS2_FEATURE_INCOMPAT_XATTR \
| OCFS2_FEATURE_INCOMPAT_META_ECC \
| OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS \
| OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE \
| OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG \
| OCFS2_FEATURE_INCOMPAT_CLUSTERINFO \
| OCFS2_FEATURE_INCOMPAT_APPEND_DIO)
#define OCFS2_FEATURE_RO_COMPAT_SUPP (OCFS2_FEATURE_RO_COMPAT_UNWRITTEN \
| OCFS2_FEATURE_RO_COMPAT_USRQUOTA \
| OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
/*
* 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
/*
* Support for alternate, userspace cluster stacks. If set, the superblock
* field s_cluster_info contains a tag for the alternate stack in use as
* well as the name of the cluster being joined.
* mount.ocfs2 must pass in a matching stack name.
*
* If not set, the classic stack will be used. This is compatbile with
* all older versions.
*/
#define OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK 0x0080
/* Support for the extended slot map */
#define OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP 0x100
/* Support for extended attributes */
#define OCFS2_FEATURE_INCOMPAT_XATTR 0x0200
/* Support for indexed directores */
#define OCFS2_FEATURE_INCOMPAT_INDEXED_DIRS 0x0400
/* Metadata checksum and error correction */
#define OCFS2_FEATURE_INCOMPAT_META_ECC 0x0800
/* Refcount tree support */
#define OCFS2_FEATURE_INCOMPAT_REFCOUNT_TREE 0x1000
/* Discontiguous block groups */
#define OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG 0x2000
/*
* Incompat bit to indicate useable clusterinfo with stackflags for all
* cluster stacks (userspace adnd o2cb). If this bit is set,
* INCOMPAT_USERSPACE_STACK becomes superfluous and thus should not be set.
*/
#define OCFS2_FEATURE_INCOMPAT_CLUSTERINFO 0x4000
/*
* Append Direct IO support
*/
#define OCFS2_FEATURE_INCOMPAT_APPEND_DIO 0x8000
/*
* backup superblock flag is used to indicate that this volume
* has backup superblocks.
*/
#define OCFS2_FEATURE_COMPAT_BACKUP_SB 0x0001
/*
* The filesystem will correctly handle journal feature bits.
*/
#define OCFS2_FEATURE_COMPAT_JBD2_SB 0x0002
/*
* Unwritten extents support.
*/
#define OCFS2_FEATURE_RO_COMPAT_UNWRITTEN 0x0001
/*
* Maintain quota information for this filesystem
*/
#define OCFS2_FEATURE_RO_COMPAT_USRQUOTA 0x0002
#define OCFS2_FEATURE_RO_COMPAT_GRPQUOTA 0x0004
/* 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 */
#define OCFS2_QUOTA_FL (0x00001000) /* Quota file */
#define OCFS2_DIO_ORPHANED_FL (0X00002000) /* On the orphan list especially
* for dio */
/*
* 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)
#define OCFS2_HAS_REFCOUNT_FL (0x0010)
/* Inode attributes, keep in sync with EXT2 */
#define OCFS2_SECRM_FL FS_SECRM_FL /* Secure deletion */
#define OCFS2_UNRM_FL FS_UNRM_FL /* Undelete */
#define OCFS2_COMPR_FL FS_COMPR_FL /* Compress file */
#define OCFS2_SYNC_FL FS_SYNC_FL /* Synchronous updates */
#define OCFS2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */
#define OCFS2_APPEND_FL FS_APPEND_FL /* writes to file may only append */
#define OCFS2_NODUMP_FL FS_NODUMP_FL /* do not dump file */
#define OCFS2_NOATIME_FL FS_NOATIME_FL /* do not update atime */
/* Reserved for compression usage... */
#define OCFS2_DIRTY_FL FS_DIRTY_FL
#define OCFS2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */
#define OCFS2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */
#define OCFS2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */
/* End compression flags --- maybe not all used */
#define OCFS2_BTREE_FL FS_BTREE_FL /* btree format dir */
#define OCFS2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */
#define OCFS2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */
#define OCFS2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */
#define OCFS2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */
#define OCFS2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */
#define OCFS2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/
#define OCFS2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */
#define OCFS2_FL_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */
#define OCFS2_FL_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */
/*
* Extent record flags (e_node.leaf.flags)
*/
#define OCFS2_EXT_UNWRITTEN (0x01) /* Extent is allocated but
* unwritten */
#define OCFS2_EXT_REFCOUNTED (0x02) /* Extent is reference
* counted in an associated
* refcount tree */
/*
* 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 ((u16)-1)
#define OCFS2_VOL_UUID_LEN 16
#define OCFS2_MAX_VOL_LABEL_LEN 64
/* The cluster stack fields */
#define OCFS2_STACK_LABEL_LEN 4
#define OCFS2_CLUSTER_NAME_LEN 16
/* Classic (historically speaking) cluster stack */
#define OCFS2_CLASSIC_CLUSTER_STACK "o2cb"
/* Journal limits (in bytes) */
#define OCFS2_MIN_JOURNAL_SIZE (4 * 1024 * 1024)
/*
* Inline extended attribute size (in bytes)
* The value chosen should be aligned to 16 byte boundaries.
*/
#define OCFS2_MIN_XATTR_INLINE_SIZE 256
/*
* Cluster info flags (ocfs2_cluster_info.ci_stackflags)
*/
#define OCFS2_CLUSTER_O2CB_GLOBAL_HEARTBEAT (0x01)
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,
#define OCFS2_FIRST_ONLINE_SYSTEM_INODE GLOBAL_INODE_ALLOC_SYSTEM_INODE
SLOT_MAP_SYSTEM_INODE,
HEARTBEAT_SYSTEM_INODE,
GLOBAL_BITMAP_SYSTEM_INODE,
USER_QUOTA_SYSTEM_INODE,
GROUP_QUOTA_SYSTEM_INODE,
#define OCFS2_LAST_GLOBAL_SYSTEM_INODE GROUP_QUOTA_SYSTEM_INODE
#define OCFS2_FIRST_LOCAL_SYSTEM_INODE ORPHAN_DIR_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,
LOCAL_USER_QUOTA_SYSTEM_INODE,
LOCAL_GROUP_QUOTA_SYSTEM_INODE,
#define OCFS2_LAST_LOCAL_SYSTEM_INODE LOCAL_GROUP_QUOTA_SYSTEM_INODE
NUM_SYSTEM_INODES
};
#define NUM_GLOBAL_SYSTEM_INODES OCFS2_FIRST_LOCAL_SYSTEM_INODE
#define NUM_LOCAL_SYSTEM_INODES \
(NUM_SYSTEM_INODES - OCFS2_FIRST_LOCAL_SYSTEM_INODE)
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 },
[USER_QUOTA_SYSTEM_INODE] = { "aquota.user", OCFS2_QUOTA_FL, S_IFREG | 0644 },
[GROUP_QUOTA_SYSTEM_INODE] = { "aquota.group", OCFS2_QUOTA_FL, 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 },
[LOCAL_USER_QUOTA_SYSTEM_INODE] = { "aquota.user:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 },
[LOCAL_GROUP_QUOTA_SYSTEM_INODE] = { "aquota.group:%04d", OCFS2_QUOTA_FL, S_IFREG | 0644 },
};
/* Parameter passed from mount.ocfs2 to module */
#define OCFS2_HB_NONE "heartbeat=none"
#define OCFS2_HB_LOCAL "heartbeat=local"
#define OCFS2_HB_GLOBAL "heartbeat=global"
/*
* 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_DIR_MIN_REC_LEN OCFS2_DIR_REC_LEN(1)
#define OCFS2_LINK_MAX 32000
#define OCFS2_DX_LINK_MAX ((1U << 31) - 1U)
#define OCFS2_LINKS_HI_SHIFT 16
#define OCFS2_DX_ENTRIES_MAX (0xffffffffU)
/*
* Convenience casts
*/
#define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super))
/*
* Block checking structure. This is used in metadata to validate the
* contents. If OCFS2_FEATURE_INCOMPAT_META_ECC is not set, it is all
* zeros.
*/
struct ocfs2_block_check {
/*00*/ __le32 bc_crc32e; /* 802.3 Ethernet II CRC32 */
__le16 bc_ecc; /* Single-error-correction parity vector.
This is a simple Hamming code dependent
on the blocksize. OCFS2's maximum
blocksize, 4K, requires 16 parity bits,
so we fit in __le16. */
__le16 bc_reserved1;
/*08*/
};
/*
* 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[]; /* 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[]; /* 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[]; /* Truncate records */
};
/*
* On disk extent block (indirect block) for OCFS2
*/
struct ocfs2_extent_block
{
/*00*/ __u8 h_signature[8]; /* Signature for verification */
struct ocfs2_block_check h_check; /* Error checking */
/*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_suballoc_loc; /* Suballocator block group this
eb belongs to. Only valid
if allocated from a
discontiguous block group */
__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 slot map for OCFS2. This defines the contents of the "slot_map"
* system file. A slot is valid if it contains a node number >= 0. The
* value -1 (0xFFFF) is OCFS2_INVALID_SLOT. This marks a slot empty.
*/
struct ocfs2_slot_map {
/*00*/ DECLARE_FLEX_ARRAY(__le16, sm_slots);
/*
* Actual on-disk size is one block. OCFS2_MAX_SLOTS is 255,
* 255 * sizeof(__le16) == 512B, within the 512B block minimum blocksize.
*/
};
struct ocfs2_extended_slot {
/*00*/ __u8 es_valid;
__u8 es_reserved1[3];
__le32 es_node_num;
/*08*/
};
/*
* The extended slot map, used when OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP
* is set. It separates out the valid marker from the node number, and
* has room to grow. Unlike the old slot map, this format is defined by
* i_size.
*/
struct ocfs2_slot_map_extended {
/*00*/ DECLARE_FLEX_ARRAY(struct ocfs2_extended_slot, se_slots);
/*
* Actual size is i_size of the slot_map system file. It should
* match s_max_slots * sizeof(struct ocfs2_extended_slot)
*/
};
/*
* ci_stackflags is only valid if the incompat bit
* OCFS2_FEATURE_INCOMPAT_CLUSTERINFO is set.
*/
struct ocfs2_cluster_info {
/*00*/ __u8 ci_stack[OCFS2_STACK_LABEL_LEN];
union {
__le32 ci_reserved;
struct {
__u8 ci_stackflags;
__u8 ci_reserved1;
__u8 ci_reserved2;
__u8 ci_reserved3;
};
};
/*08*/ __u8 ci_cluster[OCFS2_CLUSTER_NAME_LEN];
/*18*/
};
/*
* 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_uuid_hash; /* hash value of uuid */
__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*/ struct ocfs2_cluster_info s_cluster_info; /* Only valid if either
userspace or clusterinfo
INCOMPAT flag set. */
/*B8*/ __le16 s_xattr_inline_size; /* extended attribute inline size
for this fs*/
__le16 s_reserved0;
__le32 s_dx_seed[3]; /* seed[0-2] for dx dir hash.
* s_uuid_hash serves as seed[3]. */
/*C0*/ __le64 s_reserved2[15]; /* Fill out superblock */
/*140*/
/*
* NOTE: As stated above, all offsets are relative to
* ocfs2_dinode.id2, which is at 0xC0 in the inode.
* 0xC0 + 0x140 = 0x200 or 512 bytes. A superblock must fit within
* our smallest blocksize, which is 512 bytes. To ensure this,
* we reserve the space in s_reserved2. Anything past s_reserved2
* will not be available on the smallest blocksize.
*/
};
/*
* 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[];
};
/*
* 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[]; /* 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*/ __le16 i_links_count_hi; /* High 16 bits of links count */
__le16 i_xattr_inline_size;
__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*/ __le32 i_attr;
__le16 i_orphaned_slot; /* Only valid when OCFS2_ORPHANED_FL
was set in i_flags */
__le16 i_dyn_features;
__le64 i_xattr_loc;
/*80*/ struct ocfs2_block_check i_check; /* Error checking */
/*88*/ __le64 i_dx_root; /* Pointer to dir index root block */
/*90*/ __le64 i_refcount_loc;
__le64 i_suballoc_loc; /* Suballocator block group this
inode belongs to. Only valid
if allocated from a
discontiguous block group */
/*A0*/ __le16 i_dio_orphaned_slot; /* only used for append dio write */
__le16 i_reserved1[3];
__le64 i_reserved2[2];
/*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_recovery_generation; /* Incremented when the
journal is recovered
after an unclean
shutdown */
} journal1;
} id1; /* Inode type dependent 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;
DECLARE_FLEX_ARRAY(__u8, i_symlink);
} 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));
/*
* Per-block record for the unindexed directory btree. This is carefully
* crafted so that the rec_len and name_len records of an ocfs2_dir_entry are
* mirrored. That way, the directory manipulation code needs a minimal amount
* of update.
*
* NOTE: Keep this structure aligned to a multiple of 4 bytes.
*/
struct ocfs2_dir_block_trailer {
/*00*/ __le64 db_compat_inode; /* Always zero. Was inode */
__le16 db_compat_rec_len; /* Backwards compatible with
* ocfs2_dir_entry. */
__u8 db_compat_name_len; /* Always zero. Was name_len */
__u8 db_reserved0;
__le16 db_reserved1;
__le16 db_free_rec_len; /* Size of largest empty hole
* in this block. (unused) */
/*10*/ __u8 db_signature[8]; /* Signature for verification */
__le64 db_reserved2;
/*20*/ __le64 db_free_next; /* Next block in list (unused) */
__le64 db_blkno; /* Offset on disk, in blocks */
/*30*/ __le64 db_parent_dinode; /* dinode which owns me, in
blocks */
struct ocfs2_block_check db_check; /* Error checking */
/*40*/
};
/*
* A directory entry in the indexed tree. We don't store the full name here,
* but instead provide a pointer to the full dirent in the unindexed tree.
*
* We also store name_len here so as to reduce the number of leaf blocks we
* need to search in case of collisions.
*/
struct ocfs2_dx_entry {
__le32 dx_major_hash; /* Used to find logical
* cluster in index */
__le32 dx_minor_hash; /* Lower bits used to find
* block in cluster */
__le64 dx_dirent_blk; /* Physical block in unindexed
* tree holding this dirent. */
};
struct ocfs2_dx_entry_list {
__le32 de_reserved;
__le16 de_count; /* Maximum number of entries
* possible in de_entries */
__le16 de_num_used; /* Current number of
* de_entries entries */
struct ocfs2_dx_entry de_entries[]; /* Indexed dir entries
* in a packed array of
* length de_num_used */
};
#define OCFS2_DX_FLAG_INLINE 0x01
/*
* A directory indexing block. Each indexed directory has one of these,
* pointed to by ocfs2_dinode.
*
* This block stores an indexed btree root, and a set of free space
* start-of-list pointers.
*/
struct ocfs2_dx_root_block {
__u8 dr_signature[8]; /* Signature for verification */
struct ocfs2_block_check dr_check; /* Error checking */
__le16 dr_suballoc_slot; /* Slot suballocator this
* block belongs to. */
__le16 dr_suballoc_bit; /* Bit offset in suballocator
* block group */
__le32 dr_fs_generation; /* Must match super block */
__le64 dr_blkno; /* Offset on disk, in blocks */
__le64 dr_last_eb_blk; /* Pointer to last
* extent block */
__le32 dr_clusters; /* Clusters allocated
* to the indexed tree. */
__u8 dr_flags; /* OCFS2_DX_FLAG_* flags */
__u8 dr_reserved0;
__le16 dr_reserved1;
__le64 dr_dir_blkno; /* Pointer to parent inode */
__le32 dr_num_entries; /* Total number of
* names stored in
* this directory.*/
__le32 dr_reserved2;
__le64 dr_free_blk; /* Pointer to head of free
* unindexed block list. */
__le64 dr_suballoc_loc; /* Suballocator block group
this root belongs to.
Only valid if allocated
from a discontiguous
block group */
__le64 dr_reserved3[14];
union {
struct ocfs2_extent_list dr_list; /* Keep this aligned to 128
* bits for maximum space
* efficiency. */
struct ocfs2_dx_entry_list dr_entries; /* In-root-block list of
* entries. We grow out
* to extents if this
* gets too big. */
};
};
/*
* The header of a leaf block in the indexed tree.
*/
struct ocfs2_dx_leaf {
__u8 dl_signature[8];/* Signature for verification */
struct ocfs2_block_check dl_check; /* Error checking */
__le64 dl_blkno; /* Offset on disk, in blocks */
__le32 dl_fs_generation;/* Must match super block */
__le32 dl_reserved0;
__le64 dl_reserved1;
struct ocfs2_dx_entry_list dl_list;
};
/*
* Largest bitmap for a block (suballocator) group in bytes. This limit
* does not affect cluster groups (global allocator). Cluster group
* bitmaps run to the end of the block.
*/
#define OCFS2_MAX_BG_BITMAP_SIZE 256
/*
* 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;
__le16 bg_contig_free_bits; /* max contig free bits length */
__le16 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*/ struct ocfs2_block_check bg_check; /* Error checking */
__le64 bg_reserved2;
/*40*/ union {
DECLARE_FLEX_ARRAY(__u8, bg_bitmap);
struct {
/*
* Block groups may be discontiguous when
* OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG is set.
* The extents of a discontiguous block group are
* stored in bg_list. It is a flat list.
* l_tree_depth must always be zero. A
* discontiguous group is signified by a non-zero
* bg_list->l_next_free_rec. Only block groups
* can be discontiguous; Cluster groups cannot.
* We've never made a block group with more than
* 2048 blocks (256 bytes of bg_bitmap). This
* codifies that limit so that we can fit bg_list.
* bg_size of a discontiguous block group will
* be 256 to match bg_bitmap_filler.
*/
__u8 bg_bitmap_filler[OCFS2_MAX_BG_BITMAP_SIZE];
/*140*/ struct ocfs2_extent_list bg_list;
};
};
/* Actual on-disk size is one block */
};
struct ocfs2_refcount_rec {
/*00*/ __le64 r_cpos; /* Physical offset, in clusters */
__le32 r_clusters; /* Clusters covered by this extent */
__le32 r_refcount; /* Reference count of this extent */
/*10*/
};
#define OCFS2_32BIT_POS_MASK (0xffffffffULL)
#define OCFS2_REFCOUNT_LEAF_FL (0x00000001)
#define OCFS2_REFCOUNT_TREE_FL (0x00000002)
struct ocfs2_refcount_list {
/*00*/ __le16 rl_count; /* Maximum number of entries possible
in rl_records */
__le16 rl_used; /* Current number of used records */
__le32 rl_reserved2;
__le64 rl_reserved1; /* Pad to sizeof(ocfs2_refcount_record) */
/*10*/ struct ocfs2_refcount_rec rl_recs[]; /* Refcount records */
};
struct ocfs2_refcount_block {
/*00*/ __u8 rf_signature[8]; /* Signature for verification */
__le16 rf_suballoc_slot; /* Slot suballocator this block
belongs to */
__le16 rf_suballoc_bit; /* Bit offset in suballocator
block group */
__le32 rf_fs_generation; /* Must match superblock */
/*10*/ __le64 rf_blkno; /* Offset on disk, in blocks */
__le64 rf_parent; /* Parent block, only valid if
OCFS2_REFCOUNT_LEAF_FL is set in
rf_flags */
/*20*/ struct ocfs2_block_check rf_check; /* Error checking */
__le64 rf_last_eb_blk; /* Pointer to last extent block */
/*30*/ __le32 rf_count; /* Number of inodes sharing this
refcount tree */
__le32 rf_flags; /* See the flags above */
__le32 rf_clusters; /* clusters covered by refcount tree. */
__le32 rf_cpos; /* cluster offset in refcount tree.*/
/*40*/ __le32 rf_generation; /* generation number. all be the same
* for the same refcount tree. */
__le32 rf_reserved0;
__le64 rf_suballoc_loc; /* Suballocator block group this
refcount block belongs to. Only
valid if allocated from a
discontiguous block group */
/*50*/ __le64 rf_reserved1[6];
/*80*/ union {
struct ocfs2_refcount_list rf_records; /* List of refcount
records */
struct ocfs2_extent_list rf_list; /* Extent record list,
only valid if
OCFS2_REFCOUNT_TREE_FL
is set in rf_flags */
};
/* Actual on-disk size is one block */
};
/*
* On disk extended attribute structure for OCFS2.
*/
/*
* ocfs2_xattr_entry indicates one extend attribute.
*
* Note that it can be stored in inode, one block or one xattr bucket.
*/
struct ocfs2_xattr_entry {
__le32 xe_name_hash; /* hash value of xattr prefix+suffix. */
__le16 xe_name_offset; /* byte offset from the 1st entry in the
local xattr storage(inode, xattr block or
xattr bucket). */
__u8 xe_name_len; /* xattr name len, doesn't include prefix. */
__u8 xe_type; /* the low 7 bits indicate the name prefix
* type and the highest bit indicates whether
* the EA is stored in the local storage. */
__le64 xe_value_size; /* real xattr value length. */
};
/*
* On disk structure for xattr header.
*
* One ocfs2_xattr_header describes how many ocfs2_xattr_entry records in
* the local xattr storage.
*/
struct ocfs2_xattr_header {
__le16 xh_count; /* contains the count of how
many records are in the
local xattr storage. */
__le16 xh_free_start; /* current offset for storing
xattr. */
__le16 xh_name_value_len; /* total length of name/value
length in this bucket. */
__le16 xh_num_buckets; /* Number of xattr buckets
in this extent record,
only valid in the first
bucket. */
struct ocfs2_block_check xh_check; /* Error checking
(Note, this is only
used for xattr
buckets. A block uses
xb_check and sets
this field to zero.) */
struct ocfs2_xattr_entry xh_entries[]; /* xattr entry list. */
};
/*
* On disk structure for xattr value root.
*
* When an xattr's value is large enough, it is stored in an external
* b-tree like file data. The xattr value root points to this structure.
*/
struct ocfs2_xattr_value_root {
/*00*/ __le32 xr_clusters; /* clusters covered by xattr value. */
__le32 xr_reserved0;
__le64 xr_last_eb_blk; /* Pointer to last extent block */
/*10*/ struct ocfs2_extent_list xr_list; /* Extent record list */
};
/*
* On disk structure for xattr tree root.
*
* It is used when there are too many extended attributes for one file. These
* attributes will be organized and stored in an indexed-btree.
*/
struct ocfs2_xattr_tree_root {
/*00*/ __le32 xt_clusters; /* clusters covered by xattr. */
__le32 xt_reserved0;
__le64 xt_last_eb_blk; /* Pointer to last extent block */
/*10*/ struct ocfs2_extent_list xt_list; /* Extent record list */
};
#define OCFS2_XATTR_INDEXED 0x1
#define OCFS2_HASH_SHIFT 5
#define OCFS2_XATTR_ROUND 3
#define OCFS2_XATTR_SIZE(size) (((size) + OCFS2_XATTR_ROUND) & \
~(OCFS2_XATTR_ROUND))
#define OCFS2_XATTR_BUCKET_SIZE 4096
#define OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET (OCFS2_XATTR_BUCKET_SIZE \
/ OCFS2_MIN_BLOCKSIZE)
/*
* On disk structure for xattr block.
*/
struct ocfs2_xattr_block {
/*00*/ __u8 xb_signature[8]; /* Signature for verification */
__le16 xb_suballoc_slot; /* Slot suballocator this
block belongs to. */
__le16 xb_suballoc_bit; /* Bit offset in suballocator
block group */
__le32 xb_fs_generation; /* Must match super block */
/*10*/ __le64 xb_blkno; /* Offset on disk, in blocks */
struct ocfs2_block_check xb_check; /* Error checking */
/*20*/ __le16 xb_flags; /* Indicates whether this block contains
real xattr or a xattr tree. */
__le16 xb_reserved0;
__le32 xb_reserved1;
__le64 xb_suballoc_loc; /* Suballocator block group this
xattr block belongs to. Only
valid if allocated from a
discontiguous block group */
/*30*/ union {
struct ocfs2_xattr_header xb_header; /* xattr header if this
block contains xattr */
struct ocfs2_xattr_tree_root xb_root;/* xattr tree root if this
block cotains xattr
tree. */
} xb_attrs;
};
#define OCFS2_XATTR_ENTRY_LOCAL 0x80
#define OCFS2_XATTR_TYPE_MASK 0x7F
static inline void ocfs2_xattr_set_local(struct ocfs2_xattr_entry *xe,
int local)
{
if (local)
xe->xe_type |= OCFS2_XATTR_ENTRY_LOCAL;
else
xe->xe_type &= ~OCFS2_XATTR_ENTRY_LOCAL;
}
static inline int ocfs2_xattr_is_local(struct ocfs2_xattr_entry *xe)
{
return xe->xe_type & OCFS2_XATTR_ENTRY_LOCAL;
}
static inline void ocfs2_xattr_set_type(struct ocfs2_xattr_entry *xe, int type)
{
xe->xe_type |= type & OCFS2_XATTR_TYPE_MASK;
}
static inline int ocfs2_xattr_get_type(struct ocfs2_xattr_entry *xe)
{
return xe->xe_type & OCFS2_XATTR_TYPE_MASK;
}
/*
* On disk structures for global quota file
*/
/* Magic numbers and known versions for global quota files */
#define OCFS2_GLOBAL_QMAGICS {\
0x0cf52470, /* USRQUOTA */ \
0x0cf52471 /* GRPQUOTA */ \
}
#define OCFS2_GLOBAL_QVERSIONS {\
0, \
0, \
}
/* Each block of each quota file has a certain fixed number of bytes reserved
* for OCFS2 internal use at its end. OCFS2 can use it for things like
* checksums, etc. */
#define OCFS2_QBLK_RESERVED_SPACE 8
/* Generic header of all quota files */
struct ocfs2_disk_dqheader {
__le32 dqh_magic; /* Magic number identifying file */
__le32 dqh_version; /* Quota format version */
};
#define OCFS2_GLOBAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader))
/* Information header of global quota file (immediately follows the generic
* header) */
struct ocfs2_global_disk_dqinfo {
/*00*/ __le32 dqi_bgrace; /* Grace time for space softlimit excess */
__le32 dqi_igrace; /* Grace time for inode softlimit excess */
__le32 dqi_syncms; /* Time after which we sync local changes to
* global quota file */
__le32 dqi_blocks; /* Number of blocks in quota file */
/*10*/ __le32 dqi_free_blk; /* First free block in quota file */
__le32 dqi_free_entry; /* First block with free dquot entry in quota
* file */
};
/* Structure with global user / group information. We reserve some space
* for future use. */
struct ocfs2_global_disk_dqblk {
/*00*/ __le32 dqb_id; /* ID the structure belongs to */
__le32 dqb_use_count; /* Number of nodes having reference to this structure */
__le64 dqb_ihardlimit; /* absolute limit on allocated inodes */
/*10*/ __le64 dqb_isoftlimit; /* preferred inode limit */
__le64 dqb_curinodes; /* current # allocated inodes */
/*20*/ __le64 dqb_bhardlimit; /* absolute limit on disk space */
__le64 dqb_bsoftlimit; /* preferred limit on disk space */
/*30*/ __le64 dqb_curspace; /* current space occupied */
__le64 dqb_btime; /* time limit for excessive disk use */
/*40*/ __le64 dqb_itime; /* time limit for excessive inode use */
__le64 dqb_pad1;
/*50*/ __le64 dqb_pad2;
};
/*
* On-disk structures for local quota file
*/
/* Magic numbers and known versions for local quota files */
#define OCFS2_LOCAL_QMAGICS {\
0x0cf524c0, /* USRQUOTA */ \
0x0cf524c1 /* GRPQUOTA */ \
}
#define OCFS2_LOCAL_QVERSIONS {\
0, \
0, \
}
/* Quota flags in dqinfo header */
#define OLQF_CLEAN 0x0001 /* Quota file is empty (this should be after\
* quota has been cleanly turned off) */
#define OCFS2_LOCAL_INFO_OFF (sizeof(struct ocfs2_disk_dqheader))
/* Information header of local quota file (immediately follows the generic
* header) */
struct ocfs2_local_disk_dqinfo {
__le32 dqi_flags; /* Flags for quota file */
__le32 dqi_chunks; /* Number of chunks of quota structures
* with a bitmap */
__le32 dqi_blocks; /* Number of blocks allocated for quota file */
};
/* Header of one chunk of a quota file */
struct ocfs2_local_disk_chunk {
__le32 dqc_free; /* Number of free entries in the bitmap */
__u8 dqc_bitmap[]; /* Bitmap of entries in the corresponding
* chunk of quota file */
};
/* One entry in local quota file */
struct ocfs2_local_disk_dqblk {
/*00*/ __le64 dqb_id; /* id this quota applies to */
__le64 dqb_spacemod; /* Change in the amount of used space */
/*10*/ __le64 dqb_inodemod; /* Change in the amount of used inodes */
};
/*
* The quota trailer lives at the end of each quota block.
*/
struct ocfs2_disk_dqtrailer {
/*00*/ struct ocfs2_block_check dq_check; /* Error checking */
/*08*/ /* Cannot be larger than OCFS2_QBLK_RESERVED_SPACE */
};
static inline struct ocfs2_disk_dqtrailer *ocfs2_block_dqtrailer(int blocksize,
void *buf)
{
char *ptr = buf;
ptr += blocksize - OCFS2_QBLK_RESERVED_SPACE;
return (struct ocfs2_disk_dqtrailer *)ptr;
}
#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_with_xattr(struct super_block *sb,
struct ocfs2_dinode *di)
{
unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
return sb->s_blocksize -
offsetof(struct ocfs2_dinode, id2.i_data.id_data) -
xattrsize;
else
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_extent_recs_per_inode_with_xattr(
struct super_block *sb,
struct ocfs2_dinode *di)
{
int size;
unsigned int xattrsize = le16_to_cpu(di->i_xattr_inline_size);
if (le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_XATTR_FL)
size = sb->s_blocksize -
offsetof(struct ocfs2_dinode, id2.i_list.l_recs) -
xattrsize;
else
size = sb->s_blocksize -
offsetof(struct ocfs2_dinode, id2.i_list.l_recs);
return size / sizeof(struct ocfs2_extent_rec);
}
static inline int ocfs2_extent_recs_per_dx_root(struct super_block *sb)
{
int size;
size = sb->s_blocksize -
offsetof(struct ocfs2_dx_root_block, dr_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_extent_recs_per_gd(struct super_block *sb)
{
int size;
size = sb->s_blocksize -
offsetof(struct ocfs2_group_desc, bg_list.l_recs);
return size / sizeof(struct ocfs2_extent_rec);
}
static inline int ocfs2_dx_entries_per_leaf(struct super_block *sb)
{
int size;
size = sb->s_blocksize -
offsetof(struct ocfs2_dx_leaf, dl_list.de_entries);
return size / sizeof(struct ocfs2_dx_entry);
}
static inline int ocfs2_dx_entries_per_root(struct super_block *sb)
{
int size;
size = sb->s_blocksize -
offsetof(struct ocfs2_dx_root_block, dr_entries.de_entries);
return size / sizeof(struct ocfs2_dx_entry);
}
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 suballocator,
u32 feature_incompat)
{
int size = sb->s_blocksize -
offsetof(struct ocfs2_group_desc, bg_bitmap);
/*
* The cluster allocator uses the entire block. Suballocators have
* never used more than OCFS2_MAX_BG_BITMAP_SIZE. Unfortunately, older
* code expects bg_size set to the maximum. Thus we must keep
* bg_size as-is unless discontig_bg is enabled.
*/
if (suballocator &&
(feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG))
size = OCFS2_MAX_BG_BITMAP_SIZE;
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;
}
static inline u16 ocfs2_xattr_recs_per_xb(struct super_block *sb)
{
int size;
size = sb->s_blocksize -
offsetof(struct ocfs2_xattr_block,
xb_attrs.xb_root.xt_list.l_recs);
return size / sizeof(struct ocfs2_extent_rec);
}
static inline u16 ocfs2_extent_recs_per_rb(struct super_block *sb)
{
int size;
size = sb->s_blocksize -
offsetof(struct ocfs2_refcount_block, rf_list.l_recs);
return size / sizeof(struct ocfs2_extent_rec);
}
static inline u16 ocfs2_refcount_recs_per_rb(struct super_block *sb)
{
int size;
size = sb->s_blocksize -
offsetof(struct ocfs2_refcount_block, rf_records.rl_recs);
return size / sizeof(struct ocfs2_refcount_rec);
}
static inline u32
ocfs2_get_ref_rec_low_cpos(const struct ocfs2_refcount_rec *rec)
{
return le64_to_cpu(rec->r_cpos) & OCFS2_32BIT_POS_MASK;
}
#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_with_xattr(int blocksize,
struct ocfs2_dinode *di)
{
if (di && (di->i_dyn_features & OCFS2_INLINE_XATTR_FL))
return blocksize -
offsetof(struct ocfs2_dinode, id2.i_data.id_data) -
di->i_xattr_inline_size;
else
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_extent_recs_per_gd(int blocksize)
{
int size;
size = blocksize -
offsetof(struct ocfs2_group_desc, bg_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 suballocator,
uint32_t feature_incompat)
{
int size = sb->s_blocksize -
offsetof(struct ocfs2_group_desc, bg_bitmap);
/*
* The cluster allocator uses the entire block. Suballocators have
* never used more than OCFS2_MAX_BG_BITMAP_SIZE. Unfortunately, older
* code expects bg_size set to the maximum. Thus we must keep
* bg_size as-is unless discontig_bg is enabled.
*/
if (suballocator &&
(feature_incompat & OCFS2_FEATURE_INCOMPAT_DISCONTIG_BG))
size = OCFS2_MAX_BG_BITMAP_SIZE;
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;
}
static inline int ocfs2_xattr_recs_per_xb(int blocksize)
{
int size;
size = blocksize -
offsetof(struct ocfs2_xattr_block,
xb_attrs.xb_root.xt_list.l_recs);
return size / sizeof(struct ocfs2_extent_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, "%s",
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 = fs_umode_to_ftype(mode);
}
static inline int ocfs2_gd_is_discontig(struct ocfs2_group_desc *gd)
{
if ((offsetof(struct ocfs2_group_desc, bg_bitmap) +
le16_to_cpu(gd->bg_size)) !=
offsetof(struct ocfs2_group_desc, bg_list))
return 0;
/*
* Only valid to check l_next_free_rec if
* bg_bitmap + bg_size == bg_list.
*/
if (!gd->bg_list.l_next_free_rec)
return 0;
return 1;
}
#endif /* _OCFS2_FS_H */
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