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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>

#include <linux/jbd.h>

#include "cluster/nodemanager.h"

#include "cluster/heartbeat.h"

#include "cluster/tcp.h"

#include "dlm/dlmapi.h"

#include "ocfs2_fs.h"

#include "endian.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 */

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;

        struct dlm_lockstatus    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;

        wait_queue_head_t        l_event;

        struct list_head         l_debug_list;

};

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,

        OCFS2_LA_ENABLED,

        OCFS2_LA_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 */

};

#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_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;

        spinlock_t node_map_lock;

        struct ocfs2_node_map mounted_map;

        struct ocfs2_node_map recovery_map;

        struct ocfs2_node_map umount_map;

        u64 root_blkno;

        u64 system_dir_blkno;

        u64 bitmap_blkno;

        u32 bitmap_cpg;

        u8 *uuid;

        char *uuid_str;

        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_generaion, osb_flags. Could protect more on

         * osb as it's very short lived. */

        spinlock_t osb_lock;

        u32 s_next_generation;

        unsigned long osb_flags;

        unsigned long s_mount_opt;

        unsigned int s_atime_quantum;

        u16 max_slots;

        s16 node_num;

        s16 slot_num;

        s16 preferred_slot;

        int s_sectsize_bits;

        int s_clustersize;

        int s_clustersize_bits;

        atomic_t vol_state;

        struct mutex recovery_lock;

        struct task_struct *recovery_thread_task;

        int disable_recovery;

        wait_queue_head_t checkpoint_event;

        atomic_t needs_checkpoint;

        struct ocfs2_journal *journal;

        enum ocfs2_local_alloc_state local_alloc_state;

        struct buffer_head *local_alloc_bh;

        u64 la_last_gd;

        /* 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 */

        struct dlm_ctxt *dlm;

        struct ocfs2_lock_res osb_super_lockres;

        struct ocfs2_lock_res osb_rename_lockres;

        struct dlm_eviction_cb osb_eviction_cb;

        struct ocfs2_dlm_debug *osb_dlm_debug;

        struct dentry *osb_debug_root;

        wait_queue_head_t recovery_event;

        spinlock_t vote_task_lock;

        struct task_struct *vote_task;

        wait_queue_head_t vote_event;

        unsigned long vote_wake_sequence;

        unsigned long vote_work_sequence;

        struct list_head blocked_lock_list;

        unsigned long blocked_lock_count;

        struct list_head vote_list;

        int vote_count;

        u32 net_key;

        spinlock_t net_response_lock;

        unsigned int net_response_ids;

        struct list_head net_response_list;

        struct o2hb_callback_func osb_hb_up;

        struct o2hb_callback_func osb_hb_down;

        struct list_head        osb_net_handlers;

        wait_queue_head_t               osb_mount_event;

        /* Truncate log info */

        struct inode                    *osb_tl_inode;

        struct buffer_head              *osb_tl_bh;

        struct delayed_work             osb_truncate_log_wq;

        struct ocfs2_node_map           osb_recovering_orphan_dirs;

        unsigned int                    *osb_orphan_wipes;

        wait_queue_head_t               osb_wipe_event;

};

#define OCFS2_SB(sb)        ((struct ocfs2_super *)(sb)->s_fs_info)

static inline int ocfs2_should_order_data(struct inode *inode)

{

        if (!S_ISREG(inode->i_mode))

                return 0;

        if (OCFS2_SB(inode->i_sb)->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)

                return 0;

        return 1;

}

static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb)

{

        if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC)

                return 1;

        return 0;

}

static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb)

{

        /*

         * Support for sparse files is a pre-requisite

         */

        if (!ocfs2_sparse_alloc(osb))

                return 0;

        if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN)

                return 1;

        return 0;

}

static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)

{

        if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA)

                return 1;

        return 0;

}

/* set / clear functions because cluster events can make these happen

 * in parallel so we want the transitions to be atomic. this also

 * means that any future flags osb_flags must be protected by spinlock

 * too! */

static inline void ocfs2_set_osb_flag(struct ocfs2_super *osb,

                                      unsigned long flag)

{

        spin_lock(&osb->osb_lock);

        osb->osb_flags |= flag;

        spin_unlock(&osb->osb_lock);

}

static inline void ocfs2_set_ro_flag(struct ocfs2_super *osb,

                                     int hard)

{

        spin_lock(&osb->osb_lock);

        osb->osb_flags &= ~(OCFS2_OSB_SOFT_RO|OCFS2_OSB_HARD_RO);

        if (hard)

                osb->osb_flags |= OCFS2_OSB_HARD_RO;

        else

                osb->osb_flags |= OCFS2_OSB_SOFT_RO;

        spin_unlock(&osb->osb_lock);

}

static inline int ocfs2_is_hard_readonly(struct ocfs2_super *osb)

{

        int ret;

        spin_lock(&osb->osb_lock);

        ret = osb->osb_flags & OCFS2_OSB_HARD_RO;

        spin_unlock(&osb->osb_lock);

        return ret;

}

static inline int ocfs2_is_soft_readonly(struct ocfs2_super *osb)

{

        int ret;

        spin_lock(&osb->osb_lock);

        ret = osb->osb_flags & OCFS2_OSB_SOFT_RO;

        spin_unlock(&osb->osb_lock);

        return ret;

}

static inline int ocfs2_mount_local(struct ocfs2_super *osb)

{

        return (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT);

}

#define OCFS2_IS_VALID_DINODE(ptr)                                      \

        (!strcmp((ptr)->i_signature, OCFS2_INODE_SIGNATURE))

#define OCFS2_RO_ON_INVALID_DINODE(__sb, __di)  do {                    \

        typeof(__di) ____di = (__di);                                   \

        ocfs2_error((__sb),                                             \

                "Dinode # %llu has bad signature %.*s",                 \

                (unsigned long long)le64_to_cpu((____di)->i_blkno), 7,  \

                (____di)->i_signature);                                 \

} while (0)

#define OCFS2_IS_VALID_EXTENT_BLOCK(ptr)                                \

        (!strcmp((ptr)->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE))

#define OCFS2_RO_ON_INVALID_EXTENT_BLOCK(__sb, __eb)    do {            \

        typeof(__eb) ____eb = (__eb);                                   \

        ocfs2_error((__sb),                                             \

                "Extent Block # %llu has bad signature %.*s",           \

                (unsigned long long)le64_to_cpu((____eb)->h_blkno), 7,  \

                (____eb)->h_signature);                                 \

} while (0)

#define OCFS2_IS_VALID_GROUP_DESC(ptr)                                  \

        (!strcmp((ptr)->bg_signature, OCFS2_GROUP_DESC_SIGNATURE))

#define OCFS2_RO_ON_INVALID_GROUP_DESC(__sb, __gd)      do {            \

        typeof(__gd) ____gd = (__gd);                                   \

                ocfs2_error((__sb),                                     \

                "Group Descriptor # %llu has bad signature %.*s",       \

                (unsigned long long)le64_to_cpu((____gd)->bg_blkno), 7, \

                (____gd)->bg_signature);                                \

} while (0)

static inline unsigned long ino_from_blkno(struct super_block *sb,

                                           u64 blkno)

{

        return (unsigned long)(blkno & (u64)ULONG_MAX);

}

static inline u64 ocfs2_clusters_to_blocks(struct super_block *sb,

                                           u32 clusters)

{

        int c_to_b_bits = OCFS2_SB(sb)->s_clustersize_bits -

                sb->s_blocksize_bits;

        return (u64)clusters << c_to_b_bits;

}

static inline u32 ocfs2_blocks_to_clusters(struct super_block *sb,

                                           u64 blocks)

{

        int b_to_c_bits = OCFS2_SB(sb)->s_clustersize_bits -

                sb->s_blocksize_bits;

        return (u32)(blocks >> b_to_c_bits);

}

static inline unsigned int ocfs2_clusters_for_bytes(struct super_block *sb,

                                                    u64 bytes)

{

        int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;

        unsigned int clusters;

        bytes += OCFS2_SB(sb)->s_clustersize - 1;

        /* OCFS2 just cannot have enough clusters to overflow this */

        clusters = (unsigned int)(bytes >> cl_bits);

        return clusters;

}

static inline u64 ocfs2_blocks_for_bytes(struct super_block *sb,

                                         u64 bytes)

{

        bytes += sb->s_blocksize - 1;

        return bytes >> sb->s_blocksize_bits;

}

static inline u64 ocfs2_clusters_to_bytes(struct super_block *sb,

                                          u32 clusters)

{

        return (u64)clusters << OCFS2_SB(sb)->s_clustersize_bits;

}

static inline u64 ocfs2_align_bytes_to_clusters(struct super_block *sb,

                                                u64 bytes)

{

        int cl_bits = OCFS2_SB(sb)->s_clustersize_bits;

        unsigned int clusters;

        clusters = ocfs2_clusters_for_bytes(sb, bytes);

        return (u64)clusters << cl_bits;

}

static inline u64 ocfs2_align_bytes_to_blocks(struct super_block *sb,

                                              u64 bytes)

{

        u64 blocks;

        blocks = ocfs2_blocks_for_bytes(sb, bytes);

        return blocks << sb->s_blocksize_bits;

}

static inline unsigned long ocfs2_align_bytes_to_sectors(u64 bytes)

{

        return (unsigned long)((bytes + 511) >> 9);

}

static inline unsigned int ocfs2_page_index_to_clusters(struct super_block *sb,

                                                        unsigned long pg_index)

{

        u32 clusters = pg_index;

        unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;

        if (unlikely(PAGE_CACHE_SHIFT > cbits))

                clusters = pg_index << (PAGE_CACHE_SHIFT - cbits);

        else if (PAGE_CACHE_SHIFT < cbits)

                clusters = pg_index >> (cbits - PAGE_CACHE_SHIFT);

        return clusters;

}

/*

 * Find the 1st page index which covers the given clusters.

 */

static inline pgoff_t ocfs2_align_clusters_to_page_index(struct super_block *sb,

                                                        u32 clusters)

{

        unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;

        pgoff_t index = clusters;

        if (PAGE_CACHE_SHIFT > cbits) {

                index = (pgoff_t)clusters >> (PAGE_CACHE_SHIFT - cbits);

        } else if (PAGE_CACHE_SHIFT < cbits) {

                index = (pgoff_t)clusters << (cbits - PAGE_CACHE_SHIFT);

        }

        return index;

}

static inline unsigned int ocfs2_pages_per_cluster(struct super_block *sb)

{

        unsigned int cbits = OCFS2_SB(sb)->s_clustersize_bits;

        unsigned int pages_per_cluster = 1;

        if (PAGE_CACHE_SHIFT < cbits)

                pages_per_cluster = 1 << (cbits - PAGE_CACHE_SHIFT);

        return pages_per_cluster;

}

#define ocfs2_set_bit ext2_set_bit

#define ocfs2_clear_bit ext2_clear_bit

#define ocfs2_test_bit ext2_test_bit

#define ocfs2_find_next_zero_bit ext2_find_next_zero_bit

#endif  /* OCFS2_H */