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/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* ocfs2.h
*
* Defines macros and structures used in 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 as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* 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_H
#define OCFS2_H
#include <linux/spinlock.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/list.h>
#include <linux/rbtree.h>
#include <linux/workqueue.h>
#include <linux/kref.h>
#include <linux/mutex.h>
#ifndef CONFIG_OCFS2_COMPAT_JBD
# include <linux/jbd2.h>
#else
# include <linux/jbd.h>
# include "ocfs2_jbd_compat.h"
#endif
/* For union ocfs2_dlm_lksb */
#include "stackglue.h"
#include "ocfs2_fs.h"
#include "ocfs2_lockid.h"
/* Most user visible OCFS2 inodes will have very few pieces of
* metadata, but larger files (including bitmaps, etc) must be taken
* into account when designing an access scheme. We allow a small
* amount of inlined blocks to be stored on an array and grow the
* structure into a rb tree when necessary. */
#define OCFS2_INODE_MAX_CACHE_ARRAY 2
struct ocfs2_caching_info {
unsigned int ci_num_cached;
union {
sector_t ci_array[OCFS2_INODE_MAX_CACHE_ARRAY];
struct rb_root ci_tree;
} ci_cache;
};
/* this limits us to 256 nodes
* if we need more, we can do a kmalloc for the map */
#define OCFS2_NODE_MAP_MAX_NODES 256
struct ocfs2_node_map {
u16 num_nodes;
unsigned long map[BITS_TO_LONGS(OCFS2_NODE_MAP_MAX_NODES)];
};
enum ocfs2_ast_action {
OCFS2_AST_INVALID = 0,
OCFS2_AST_ATTACH,
OCFS2_AST_CONVERT,
OCFS2_AST_DOWNCONVERT,
};
/* actions for an unlockast function to take. */
enum ocfs2_unlock_action {
OCFS2_UNLOCK_INVALID = 0,
OCFS2_UNLOCK_CANCEL_CONVERT,
OCFS2_UNLOCK_DROP_LOCK,
};
/* ocfs2_lock_res->l_flags flags. */
#define OCFS2_LOCK_ATTACHED (0x00000001) /* have we initialized
* the lvb */
#define OCFS2_LOCK_BUSY (0x00000002) /* we are currently in
* dlm_lock */
#define OCFS2_LOCK_BLOCKED (0x00000004) /* blocked waiting to
* downconvert*/
#define OCFS2_LOCK_LOCAL (0x00000008) /* newly created inode */
#define OCFS2_LOCK_NEEDS_REFRESH (0x00000010)
#define OCFS2_LOCK_REFRESHING (0x00000020)
#define OCFS2_LOCK_INITIALIZED (0x00000040) /* track initialization
* for shutdown paths */
#define OCFS2_LOCK_FREEING (0x00000080) /* help dlmglue track
* when to skip queueing
* a lock because it's
* about to be
* dropped. */
#define OCFS2_LOCK_QUEUED (0x00000100) /* queued for downconvert */
#define OCFS2_LOCK_NOCACHE (0x00000200) /* don't use a holder count */
#define OCFS2_LOCK_PENDING (0x00000400) /* This lockres is pending a
call to dlm_lock. Only
exists with BUSY set. */
struct ocfs2_lock_res_ops;
typedef void (*ocfs2_lock_callback)(int status, unsigned long data);
struct ocfs2_lock_res {
void *l_priv;
struct ocfs2_lock_res_ops *l_ops;
spinlock_t l_lock;
struct list_head l_blocked_list;
struct list_head l_mask_waiters;
enum ocfs2_lock_type l_type;
unsigned long l_flags;
char l_name[OCFS2_LOCK_ID_MAX_LEN];
int l_level;
unsigned int l_ro_holders;
unsigned int l_ex_holders;
union ocfs2_dlm_lksb l_lksb;
/* used from AST/BAST funcs. */
enum ocfs2_ast_action l_action;
enum ocfs2_unlock_action l_unlock_action;
int l_requested;
int l_blocking;
unsigned int l_pending_gen;
wait_queue_head_t l_event;
struct list_head l_debug_list;
#ifdef CONFIG_OCFS2_FS_STATS
unsigned long long l_lock_num_prmode; /* PR acquires */
unsigned long long l_lock_num_exmode; /* EX acquires */
unsigned int l_lock_num_prmode_failed; /* Failed PR gets */
unsigned int l_lock_num_exmode_failed; /* Failed EX gets */
unsigned long long l_lock_total_prmode; /* Tot wait for PR */
unsigned long long l_lock_total_exmode; /* Tot wait for EX */
unsigned int l_lock_max_prmode; /* Max wait for PR */
unsigned int l_lock_max_exmode; /* Max wait for EX */
unsigned int l_lock_refresh; /* Disk refreshes */
#endif
};
struct ocfs2_dlm_debug {
struct kref d_refcnt;
struct dentry *d_locking_state;
struct list_head d_lockres_tracking;
};
enum ocfs2_vol_state
{
VOLUME_INIT = 0,
VOLUME_MOUNTED,
VOLUME_DISMOUNTED,
VOLUME_DISABLED
};
struct ocfs2_alloc_stats
{
atomic_t moves;
atomic_t local_data;
atomic_t bitmap_data;
atomic_t bg_allocs;
atomic_t bg_extends;
};
enum ocfs2_local_alloc_state
{
OCFS2_LA_UNUSED = 0, /* Local alloc will never be used for
* this mountpoint. */
OCFS2_LA_ENABLED, /* Local alloc is in use. */
OCFS2_LA_THROTTLED, /* Local alloc is in use, but number
* of bits has been reduced. */
OCFS2_LA_DISABLED /* Local alloc has temporarily been
* disabled. */
};
enum ocfs2_mount_options
{
OCFS2_MOUNT_HB_LOCAL = 1 << 0, /* Heartbeat started in local mode */
OCFS2_MOUNT_BARRIER = 1 << 1, /* Use block barriers */
OCFS2_MOUNT_NOINTR = 1 << 2, /* Don't catch signals */
OCFS2_MOUNT_ERRORS_PANIC = 1 << 3, /* Panic on errors */
OCFS2_MOUNT_DATA_WRITEBACK = 1 << 4, /* No data ordering */
OCFS2_MOUNT_LOCALFLOCKS = 1 << 5, /* No cluster aware user file locks */
OCFS2_MOUNT_NOUSERXATTR = 1 << 6, /* No user xattr */
OCFS2_MOUNT_INODE64 = 1 << 7, /* Allow inode numbers > 2^32 */
};
#define OCFS2_OSB_SOFT_RO 0x0001
#define OCFS2_OSB_HARD_RO 0x0002
#define OCFS2_OSB_ERROR_FS 0x0004
#define OCFS2_DEFAULT_ATIME_QUANTUM 60
struct ocfs2_journal;
struct ocfs2_slot_info;
struct ocfs2_recovery_map;
struct ocfs2_super
{
struct task_struct *commit_task;
struct super_block *sb;
struct inode *root_inode;
struct inode *sys_root_inode;
struct inode *system_inodes[NUM_SYSTEM_INODES];
struct ocfs2_slot_info *slot_info;
u32 *slot_recovery_generations;
spinlock_t node_map_lock;
u64 root_blkno;
u64 system_dir_blkno;
u64 bitmap_blkno;
u32 bitmap_cpg;
u8 *uuid;
char *uuid_str;
u32 uuid_hash;
u8 *vol_label;
u64 first_cluster_group_blkno;
u32 fs_generation;
u32 s_feature_compat;
u32 s_feature_incompat;
u32 s_feature_ro_compat;
/* Protects s_next_generation, osb_flags and s_inode_steal_slot.
* Could protect more on osb as it's very short lived.
*/
spinlock_t osb_lock;
u32 s_next_generation;
unsigned long osb_flags;
s16 s_inode_steal_slot;
atomic_t s_num_inodes_stolen;
unsigned long s_mount_opt;
unsigned int s_atime_quantum;
unsigned int max_slots;
unsigned int node_num;
int slot_num;
int preferred_slot;
int s_sectsize_bits;
int s_clustersize;
int s_clustersize_bits;
unsigned int s_xattr_inline_size;
atomic_t vol_state;
struct mutex recovery_lock;
struct ocfs2_recovery_map *recovery_map;
struct task_struct *recovery_thread_task;
int disable_recovery;
wait_queue_head_t checkpoint_event;
atomic_t needs_checkpoint;
struct ocfs2_journal *journal;
unsigned long osb_commit_interval;
struct delayed_work la_enable_wq;
/*
* Must hold local alloc i_mutex and osb->osb_lock to change
* local_alloc_bits. Reads can be done under either lock.
*/
unsigned int local_alloc_bits;
unsigned int local_alloc_default_bits;
enum ocfs2_local_alloc_state local_alloc_state; /* protected
* by osb_lock */
struct buffer_head *local_alloc_bh;
u64 la_last_gd;
#ifdef CONFIG_OCFS2_FS_STATS
struct dentry *local_alloc_debug;
char *local_alloc_debug_buf;
#endif
/* Next two fields are for local node slot recovery during
* mount. */
int dirty;
struct ocfs2_dinode *local_alloc_copy;
struct ocfs2_alloc_stats alloc_stats;
char dev_str[20]; /* "major,minor" of the device */
char osb_cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
struct ocfs2_cluster_connection *cconn;
struct ocfs2_lock_res osb_super_lockres;
struct ocfs2_lock_res osb_rename_lockres;
struct ocfs2_dlm_debug *osb_dlm_debug;
struct dentry *osb_debug_root;
wait_queue_head_t recovery_event;
spinlock_t dc_task_lock;
struct task_struct *dc_task;
wait_queue_head_t
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