text: /*
   * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
   *
   * This copyrighted material is made available to anyone wishing to use,
   * modify, copy, or redistribute it subject to the terms and conditions
   * of the GNU General Public License version 2.
   */
  
  #ifndef __INCORE_DOT_H__
  #define __INCORE_DOT_H__
  
  #include <linux/fs.h>
  #include <linux/kobject.h>
  #include <linux/workqueue.h>
  #include <linux/dlm.h>
  #include <linux/buffer_head.h>
  #include <linux/rcupdate.h>
  #include <linux/rculist_bl.h>
  #include <linux/completion.h>
  #include <linux/rbtree.h>
  #include <linux/ktime.h>
  #include <linux/percpu.h>
  #include <linux/lockref.h>
  #include <linux/rhashtable.h>
  
  #define DIO_WAIT	0x00000010
  #define DIO_METADATA	0x00000020
  
  struct gfs2_log_operations;
  struct gfs2_bufdata;
  struct gfs2_holder;
  struct gfs2_glock;
  struct gfs2_quota_data;
  struct gfs2_trans;
  struct gfs2_jdesc;
  struct gfs2_sbd;
  struct lm_lockops;
  
  typedef void (*gfs2_glop_bh_t) (struct gfs2_glock *gl, unsigned int ret);
  
  struct gfs2_log_header_host {
  	u64 lh_sequence;	/* Sequence number of this transaction */
  	u32 lh_flags;		/* GFS2_LOG_HEAD_... */
  	u32 lh_tail;		/* Block number of log tail */
  	u32 lh_blkno;
  };
  
  /*
   * Structure of operations that are associated with each
   * type of element in the log.
   */
  
  struct gfs2_log_operations {
  	void (*lo_before_commit) (struct gfs2_sbd *sdp, struct gfs2_trans *tr);
  	void (*lo_after_commit) (struct gfs2_sbd *sdp, struct gfs2_trans *tr);
  	void (*lo_before_scan) (struct gfs2_jdesc *jd,
  				struct gfs2_log_header_host *head, int pass);
  	int (*lo_scan_elements) (struct gfs2_jdesc *jd, unsigned int start,
  				 struct gfs2_log_descriptor *ld, __be64 *ptr,
  				 int pass);
  	void (*lo_after_scan) (struct gfs2_jdesc *jd, int error, int pass);
  	const char *lo_name;
  };
  
  #define GBF_FULL 1
  
  /**
   * Clone bitmaps (bi_clone):
   *
   * - When a block is freed, we remember the previous state of the block in the
   *   clone bitmap, and only mark the block as free in the real bitmap.
   *
   * - When looking for a block to allocate, we check for a free block in the
   *   clone bitmap, and if no clone bitmap exists, in the real bitmap.
   *
   * - For allocating a block, we mark it as allocated in the real bitmap, and if
   *   a clone bitmap exists, also in the clone bitmap.
   *
   * - At the end of a log_flush, we copy the real bitmap into the clone bitmap
   *   to make the clone bitmap reflect the current allocation state.
   *   (Alternatively, we could remove the clone bitmap.)
   *
   * The clone bitmaps are in-core only, and is never written to disk.
   *
   * These steps ensure that blocks which have been freed in a transaction cannot
   * be reallocated in that same transaction.
   */
  struct gfs2_bitmap {
  	struct buffer_head *bi_bh;
  	char *bi_clone;
  	unsigned long bi_flags;
  	u32 bi_offset;
  	u32 bi_start;
  	u32 bi_bytes;
  	u32 bi_blocks;
  };
  
  struct gfs2_rgrpd {
  	struct rb_node rd_node;		/* Link with superblock */
  	struct gfs2_glock *rd_gl;	/* Glock for this rgrp */
  	u64 rd_addr;			/* grp block disk address */
  	u64 rd_data0;			/* first data location */
  	u32 rd_length;			/* length of rgrp header in fs blocks */
  	u32 rd_data;			/* num of data blocks in rgrp */
  	u32 rd_bitbytes;		/* number of bytes in data bitmaps */
  	u32 rd_free;
  	u32 rd_reserved;                /* number of blocks reserved */
  	u32 rd_free_clone;
  	u32 rd_dinodes;
  	u64 rd_igeneration;
  	struct gfs2_bitmap *rd_bits;
  	struct gfs2_sbd *rd_sbd;
  	struct gfs2_rgrp_lvb *rd_rgl;
  	u32 rd_last_alloc;
  	u32 rd_flags;
  	u32 rd_extfail_pt;		/* extent failure point */
  #define GFS2_RDF_CHECK		0x10000000 /* check for unlinked inodes */
  #define GFS2_RDF_UPTODATE	0x20000000 /* rg is up to date */
  #define GFS2_RDF_ERROR		0x40000000 /* error in rg */
  #define GFS2_RDF_PREFERRED	0x80000000 /* This rgrp is preferred */
  #define GFS2_RDF_MASK		0xf0000000 /* mask for internal flags */
  	spinlock_t rd_rsspin;           /* protects reservation related vars */
  	struct rb_root rd_rstree;       /* multi-block reservation tree */
  };
  
  struct gfs2_rbm {
  	struct gfs2_rgrpd *rgd;
  	u32 offset;		/* The offset is bitmap relative */
  	int bii;		/* Bitmap index */
  };
  
  static inline struct gfs2_bitmap *rbm_bi(const struct gfs2_rbm *rbm)
  {
  	return rbm->rgd->rd_bits + rbm->bii;
  }
  
  static inline u64 gfs2_rbm_to_block(const struct gfs2_rbm *rbm)
  {
  	BUG_ON(rbm->offset >= rbm->rgd->rd_data);
  	return rbm->rgd->rd_data0 + (rbm_bi(rbm)->bi_start * GFS2_NBBY) +
  		rbm->offset;
  }
  
  static inline bool gfs2_rbm_eq(const struct gfs2_rbm *rbm1,
  			       const struct gfs2_rbm *rbm2)
  {
  	return (rbm1->rgd == rbm2->rgd) && (rbm1->bii == rbm2->bii) &&
  	       (rbm1->offset == rbm2->offset);
  }
  
  enum gfs2_state_bits {
  	BH_Pinned = BH_PrivateStart,
  	BH_Escaped = BH_PrivateStart + 1,
  };
  
  BUFFER_FNS(Pinned, pinned)
  TAS_BUFFER_FNS(Pinned, pinned)
  BUFFER_FNS(Escaped, escaped)
  TAS_BUFFER_FNS(Escaped, escaped)
  
  struct gfs2_bufdata {
  	struct buffer_head *bd_bh;
  	struct gfs2_glock *bd_gl;
  	u64 bd_blkno;
  
  	struct list_head bd_list;
  
  	struct gfs2_trans *bd_tr;
  	struct list_head bd_ail_st_list;
  	struct list_head bd_ail_gl_list;
  };
  
  /*
   * Internally, we prefix things with gdlm_ and GDLM_ (for gfs-dlm) since a
   * prefix of lock_dlm_ gets awkward.
   */
  
  #define GDLM_STRNAME_BYTES	25
  #define GDLM_LVB_SIZE		32
  
  /*
   * ls_recover_flags:
   *
   * DFL_BLOCK_LOCKS: dlm is in recovery and will grant locks that had been
   * held by failed nodes whose journals need recovery.  Those locks should
   * only be used for journal recovery until the journal recovery is done.
   * This is set by the dlm recover_prep callback and cleared by the
   * gfs2_control thread when journal recovery is complete.  To avoid
   * races between recover_prep setting and gfs2_control clearing, recover_spin
   * is held while changing this bit and reading/writing recover_block
   * and recover_start.
   *
   * DFL_NO_DLM_OPS: dlm lockspace ops/callbacks are not being used.
   *
   * DFL_FIRST_MOUNT: this node is the first to mount this fs and is doing
   * recovery of all journals before allowing other nodes to mount the fs.
   * This is cleared when FIRST_MOUNT_DONE is set.
   *
   * DFL_FIRST_MOUNT_DONE: this node was the first mounter, and has finished
   * recovery of all journals, and now allows other nodes to mount the fs.
   *
   * DFL_MOUNT_DONE: gdlm_mount has completed successfully and cleared
   * BLOCK_LOCKS for the first time.  The gfs2_control thread should now
   * control clearing BLOCK_LOCKS for further recoveries.
   *
   * DFL_UNMOUNT: gdlm_unmount sets to keep sdp off gfs2_control_wq.
   *
   * DFL_DLM_RECOVERY: set while dlm is in recovery, between recover_prep()
   * and recover_done(), i.e. set while recover_block == recover_start.
   */
  
  enum {
  	DFL_BLOCK_LOCKS		= 0,
  	DFL_NO_DLM_OPS		= 1,
  	DFL_FIRST_MOUNT		= 2,
  	DFL_FIRST_MOUNT_DONE	= 3,
  	DFL_MOUNT_DONE		= 4,
  	DFL_UNMOUNT		= 5,
  	DFL_DLM_RECOVERY	= 6,
  };
  
  /*
   * We are using struct lm_lockname as an rhashtable key.  Avoid holes within
   * the struct; padding at the end is fine.
   */
  struct lm_lockname {
  	u64 ln_number;
  	struct gfs2_sbd *ln_sbd;
  	unsigned int ln_type;
  };
  
  #define lm_name_equal(name1, name2) \
          (((name1)->ln_number == (name2)->ln_number) &&	\
  	 ((name1)->ln_type == (name2)->ln_type) &&	\
  	 ((name1)->ln_sbd == (name2)->ln_sbd))
  
  
  struct gfs2_glock_operations {
  	void (*go_sync) (struct gfs2_glock *gl);
  	int (*go_xmote_bh) (struct gfs2_glock *gl, struct gfs2_holder *gh);
  	void (*go_inval) (struct gfs2_glock *gl, int flags);
  	int (*go_demote_ok) (const struct gfs2_glock *gl);
  	int (*go_lock) (struct gfs2_holder *gh);
  	void (*go_unlock) (struct gfs2_holder *gh);
  	void (*go_dump)(struct seq_file *seq, struct gfs2_glock *gl);
  	void (*go_callback)(struct gfs2_glock *gl, bool remote);
  	const int go_type;
  	const unsigned long go_flags;
  #define GLOF_ASPACE 1
  #define GLOF_LVB    2
  #define GLOF_LRU    4
  };
  
  enum {
  	GFS2_LKS_SRTT = 0,	/* Non blocking smoothed round trip time */
  	GFS2_LKS_SRTTVAR = 1,	/* Non blocking smoothed variance */
  	GFS2_LKS_SRTTB = 2,	/* Blocking smoothed round trip time */
  	GFS2_LKS_SRTTVARB = 3,	/* Blocking smoothed variance */
  	GFS2_LKS_SIRT = 4,	/* Smoothed Inter-request time */
  	GFS2_LKS_SIRTVAR = 5,	/* Smoothed Inter-request variance */
  	GFS2_LKS_DCOUNT = 6,	/* Count of dlm requests */
  	GFS2_LKS_QCOUNT = 7,	/* Count of gfs2_holder queues */
  	GFS2_NR_LKSTATS
  };
  
  struct gfs2_lkstats {
  	u64 stats[GFS2_NR_LKSTATS];
  };
  
  enum {
  	/* States */
  	HIF_HOLDER		= 6,  /* Set for gh that "holds" the glock */
  	HIF_FIRST		= 7,
  	HIF_WAIT		= 10,
  };
  
  struct gfs2_holder {
  	struct list_head gh_list;
  
  	struct gfs2_glock *gh_gl;
  	struct pid *gh_owner_pid;
  	u16 gh_flags;
  	u16 gh_state;
  
  	int gh_error;
  	unsigned long gh_iflags; /* HIF_... */
  	unsigned long gh_ip;
  };
  
  /* Number of quota types we support */
  #define GFS2_MAXQUOTAS 2
  
  struct gfs2_qadata { /* quota allocation data */
  	/* Quota stuff */
  	struct gfs2_quota_data *qa_qd[2 * GFS2_MAXQUOTAS];
  	struct gfs2_holder qa_qd_ghs[2 * GFS2_MAXQUOTAS];
  	unsigned int qa_qd_num;
  };
  
  /* Resource group multi-block reservation, in order of appearance:
  
     Step 1. Function prepares to write, allocates a mb, sets the size hint.
     Step 2. User calls inplace_reserve to target an rgrp, sets the rgrp info
     Step 3. Function get_local_rgrp locks the rgrp, determines which bits to use
     Step 4. Bits are assigned from the rgrp based on either the reservation
             or wherever it can.
  */
  
  struct gfs2_blkreserv {
  	struct rb_node rs_node;       /* link to other block reservations */
  	struct gfs2_rbm rs_rbm;       /* Start of reservation */
  	u32 rs_free;                  /* how many blocks are still free */
  };
  
  /*
   * Allocation parameters
   * @target: The number of blocks we'd ideally like to allocate
   * @aflags: The flags (e.g. Orlov flag)
   *
   * The intent is to gradually expand this structure over time in
   * order to give more information, e.g. alignment, min extent size
   * to the allocation code.
   */
  struct gfs2_alloc_parms {
  	u64 target;
  	u32 min_target;
  	u32 aflags;
  	u64 allowed;
  };
  
  enum {
  	GLF_LOCK			= 1,
  	GLF_DEMOTE			= 3,
  	GLF_PENDING_DEMOTE		= 4,
  	GLF_DEMOTE_IN_PROGRESS		= 5,
  	GLF_DIRTY			= 6,
  	GLF_LFLUSH			= 7,
  	GLF_INVALIDATE_IN_PROGRESS	= 8,
  	GLF_REPLY_PENDING		= 9,
  	GLF_INITIAL			= 10,
  	GLF_FROZEN			= 11,
  	GLF_QUEUED			= 12,
  	GLF_LRU				= 13,
  	GLF_OBJECT			= 14, /* Used only for tracing */
  	GLF_BLOCKING			= 15,
  	GLF_INODE_CREATING		= 16, /* Inode creation occurring */
  };
  
  struct gfs2_glock {
  	unsigned long gl_flags;		/* GLF_... */
  	struct lm_lockname gl_name;
  
  	struct lockref gl_lockref;
  
  	/* State fields protected by gl_lockref.lock */
  	unsigned int gl_state:2,	/* Current state */
  		     gl_target:2,	/* Target state */
  		     gl_demote_state:2,	/* State requested by remote node */
  		     gl_req:2,		/* State in last dlm request */
  		     gl_reply:8;	/* Last reply from the dlm */
  
  	unsigned long gl_demote_time; /* time of first demote request */
  	long gl_hold_time;
  	struct list_head gl_holders;
  
  	const struct gfs2_glock_operations *gl_ops;
  	ktime_t gl_dstamp;
  	struct gfs2_lkstats gl_stats;
  	struct dlm_lksb gl_lksb;
  	unsigned long gl_tchange;
  	void *gl_object;
  
  	struct list_head gl_lru;
  	struct list_head gl_ail_list;
  	atomic_t gl_ail_count;
  	atomic_t gl_revokes;
  	struct delayed_work gl_work;
  	union {
  		/* For inode and iopen glocks only */
  		struct work_struct gl_delete;
  		/* For rgrp glocks only */
  		struct {
  			loff_t start;
  			loff_t end;
  		} gl_vm;
  	};
  	struct rcu_head gl_rcu;
  	struct rhash_head gl_node;
  };
  
  #define GFS2_MIN_LVB_SIZE 32	/* Min size of LVB that gfs2 supports */
  
  enum {
  	GIF_INVALID		= 0,
  	GIF_QD_LOCKED		= 1,
  	GIF_ALLOC_FAILED	= 2,
  	GIF_SW_PAGED		= 3,
  	GIF_ORDERED		= 4,
  	GIF_FREE_VFS_INODE      = 5,
  	GIF_GLOP_PENDING	= 6,
  };
  
  struct gfs2_inode {
  	struct inode i_inode;
  	u64 i_no_addr;
  	u64 i_no_formal_ino;
  	u64 i_generation;
  	u64 i_eattr;
  	unsigned long i_flags;		/* GIF_... */
  	struct gfs2_glock *i_gl; /* Move into i_gh? */
  	struct gfs2_holder i_iopen_gh;
  	struct gfs2_holder i_gh; /* for prepare/commit_write only */
  	struct gfs2_qadata *i_qadata; /* quota allocation data */
  	struct gfs2_holder i_rgd_gh;
  	struct gfs2_blkreserv i_res; /* rgrp multi-block reservation */
  	u64 i_goal;	/* goal block for allocations */
  	atomic_t i_sizehint;  /* hint of the write size */
  	struct rw_semaphore i_rw_mutex;
  	struct list_head i_ordered;
  	struct list_head i_trunc_list;
  	__be64 *i_hash_cache;
  	u32 i_entries;
  	u32 i_diskflags;
  	u8 i_height;
  	u8 i_depth;
  	u16 i_rahead;
  };
  
  /*
   * Since i_inode is the first element of struct gfs2_inode,
   * this is effectively a cast.
   */
  static inline struct gfs2_inode *GFS2_I(struct inode *inode)
  {
  	return container_of(inode, struct gfs2_inode, i_inode);
  }
  
  static inline struct gfs2_sbd *GFS2_SB(const struct inode *inode)
  {
  	return inode->i_sb->s_fs_info;
  }
  
  struct gfs2_file {
  	struct mutex f_fl_mutex;
  	struct gfs2_holder f_fl_gh;
  };
  
  struct gfs2_revoke_replay {
  	struct list_head rr_list;
  	u64 rr_blkno;
  	unsigned int rr_where;
  };
  
  enum {
  	QDF_CHANGE		= 1,
  	QDF_LOCKED		= 2,
  	QDF_REFRESH		= 3,
  	QDF_QMSG_QUIET          = 4,
  };
  
  struct gfs2_quota_data {
  	struct hlist_bl_node qd_hlist;
  	struct list_head qd_list;
  	struct kqid qd_id;
  	struct gfs2_sbd *qd_sbd;
  	struct lockref qd_lockref;
  	struct list_head qd_lru;
  	unsigned qd_hash;
  
  	unsigned long qd_flags;		/* QDF_... */
  
  	s64 qd_change;
  	s64 qd_change_sync;
  
  	unsigned int qd_slot;
  	unsigned int qd_slot_count;
  
  	struct buffer_head *qd_bh;
  	struct gfs2_quota_change *qd_bh_qc;
  	unsigned int qd_bh_count;
  
  	struct gfs2_glock *qd_gl;
  	struct gfs2_quota_lvb qd_qb;
  
  	u64 qd_sync_gen;
  	unsigned long qd_last_warn;
  	struct rcu_head qd_rcu;
  };
  
  enum {
  	TR_TOUCHED = 1,
  	TR_ATTACHED = 2,
  	TR_ALLOCED = 3,
  };
  
  struct gfs2_trans {
  	unsigned long tr_ip;
  
  	unsigned int tr_blocks;
  	unsigned int tr_revokes;
  	unsigned int tr_reserved;
  	unsigned long tr_flags;
  
  	unsigned int tr_num_buf_new;
  	unsigned int tr_num_databuf_new;
  	unsigned int tr_num_buf_rm;
  	unsigned int tr_num_databuf_rm;
  	unsigned int tr_num_revoke;
  	unsigned int tr_num_revoke_rm;
  
  	struct list_head tr_list;
  	struct list_head tr_databuf;
  	struct list_head tr_buf;
  
  	unsigned int tr_first;
  	struct list_head tr_ail1_list;
  	struct list_head tr_ail2_list;
  };
  
  struct gfs2_journal_extent {
  	struct list_head list;
  
  	unsigned int lblock; /* First logical block */
  	u64 dblock; /* First disk block */
  	u64 blocks;
  };
  
  struct gfs2_jdesc {
  	struct list_head jd_list;
  	struct list_head extent_list;
  	unsigned int nr_extents;
  	struct work_struct jd_work;
  	struct inode *jd_inode;
  	unsigned long jd_flags;
  #define JDF_RECOVERY 1
  	unsigned int jd_jid;
  	unsigned int jd_blocks;
  	int jd_recover_error;
  	/* Replay stuff */
  
  	unsigned int jd_found_blocks;
  	unsigned int jd_found_revokes;
  	unsigned int jd_replayed_blocks;
  
  	struct list_head jd_revoke_list;
  	unsigned int jd_replay_tail;
  
  };
  
  struct gfs2_statfs_change_host {
  	s64 sc_total;
  	s64 sc_free;
  	s64 sc_dinodes;
  };
  
  #define GFS2_QUOTA_DEFAULT	GFS2_QUOTA_OFF
  #define GFS2_QUOTA_OFF		0
  #define GFS2_QUOTA_ACCOUNT	1
  #define GFS2_QUOTA_ON		2
  
  #define GFS2_DATA_DEFAULT	GFS2_DATA_ORDERED
  #define GFS2_DATA_WRITEBACK	1
  #define GFS2_DATA_ORDERED	2
  
  #define GFS2_ERRORS_DEFAULT     GFS2_ERRORS_WITHDRAW
  #define GFS2_ERRORS_WITHDRAW    0
  #define GFS2_ERRORS_CONTINUE    1 /* place holder for future feature */
  #define GFS2_ERRORS_RO          2 /* place holder for future feature */
  #define GFS2_ERRORS_PANIC       3
  
  struct gfs2_args {
  	char ar_lockproto[GFS2_LOCKNAME_LEN];	/* Name of the Lock Protocol */
  	char ar_locktable[GFS2_LOCKNAME_LEN];	/* Name of the Lock Table */
  	char ar_hostdata[GFS2_LOCKNAME_LEN];	/* Host specific data */
  	unsigned int ar_spectator:1;		/* Don't get a journal */
  	unsigned int ar_localflocks:1;		/* Let the VFS do flock|fcntl */
  	unsigned int ar_debug:1;		/* Oops on errors */
  	unsigned int ar_posix_acl:1;		/* Enable posix acls */
  	unsigned int ar_quota:2;		/* off/account/on */
  	unsigned int ar_suiddir:1;		/* suiddir support */
  	unsigned int ar_data:2;			/* ordered/writeback */
  	unsigned int ar_meta:1;			/* mount metafs */
  	unsigned int ar_discard:1;		/* discard requests */
  	unsigned int ar_errors:2;               /* errors=withdraw | panic */
  	unsigned int ar_nobarrier:1;            /* do not send barriers */
  	unsigned int ar_rgrplvb:1;		/* use lvbs for rgrp info */
  	unsigned int ar_loccookie:1;		/* use location based readdir
  						   cookies */
  	int ar_commit;				/* Commit interval */
  	int ar_statfs_quantum;			/* The fast statfs interval */
  	int ar_quota_quantum;			/* The quota interval */
  	int ar_statfs_percent;			/* The % change to force sync */
  };
  
  struct gfs2_tune {
  	spinlock_t gt_spin;
  
  	unsigned int gt_logd_secs;
  
  	unsigned int gt_quota_warn_period; /* Secs between quota warn msgs */
  	unsigned int gt_quota_scale_num; /* Numerator */
  	unsigned int gt_quota_scale_den; /* Denominator */
  	unsigned int gt_quota_quantum; /* Secs between syncs to quota file */
  	unsigned int gt_new_files_jdata;
  	unsigned int gt_max_readahead; /* Max bytes to read-ahead from disk */
  	unsigned int gt_complain_secs;
  	unsigned int gt_statfs_quantum;
  	unsigned int gt_statfs_slow;
  };
  
  enum {
  	SDF_JOURNAL_CHECKED	= 0,
  	SDF_JOURNAL_LIVE	= 1,
  	SDF_SHUTDOWN		= 2,
  	SDF_NOBARRIERS		= 3,
  	SDF_NORECOVERY		= 4,
  	SDF_DEMOTE		= 5,
  	SDF_NOJOURNALID		= 6,
  	SDF_RORECOVERY		= 7, /* read only recovery */
  	SDF_SKIP_DLM_UNLOCK	= 8,
  	SDF_FORCE_AIL_FLUSH     = 9,
  	SDF_AIL1_IO_ERROR	= 10,
  };
  
  enum gfs2_freeze_state {
  	SFS_UNFROZEN		= 0,
  	SFS_STARTING_FREEZE	= 1,
  	SFS_FROZEN		= 2,
  };
  
  #define GFS2_FSNAME_LEN		256
  
  struct gfs2_inum_host {
  	u64 no_formal_ino;
  	u64 no_addr;
  };
  
  struct gfs2_sb_host {
  	u32 sb_magic;
  	u32 sb_type;
  	u32 sb_format;
  
  	u32 sb_fs_format;
  	u32 sb_multihost_format;
  	u32 sb_bsize;
  	u32 sb_bsize_shift;
  
  	struct gfs2_inum_host sb_master_dir;
  	struct gfs2_inum_host sb_root_dir;
  
  	char sb_lockproto[GFS2_LOCKNAME_LEN];
  	char sb_locktable[GFS2_LOCKNAME_LEN];
  };
  
  /*
   * lm_mount() return values
   *
   * ls_jid - the journal ID this node should use
   * ls_first - this node is the first to mount the file system
   * ls_lockspace - lock module's context for this file system
   * ls_ops - lock module's functions
   */
  
  struct lm_lockstruct {
  	int ls_jid;
  	unsigned int ls_first;
  	const struct lm_lockops *ls_ops;
  	dlm_lockspace_t *ls_dlm;
  
  	int ls_recover_jid_done;   /* These two are deprecated, */
  	int ls_recover_jid_status; /* used previously by gfs_controld */
  
  	struct dlm_lksb ls_mounted_lksb; /* mounted_lock */
  	struct dlm_lksb ls_control_lksb; /* control_lock */
  	char ls_control_lvb[GDLM_LVB_SIZE]; /* control_lock lvb */
  	struct completion ls_sync_wait; /* {control,mounted}_{lock,unlock} */
  	char *ls_lvb_bits;
  
  	spinlock_t ls_recover_spin; /* protects following fields */
  	unsigned long ls_recover_flags; /* DFL_ */
  	uint32_t ls_recover_mount; /* gen in first recover_done cb */
  	uint32_t ls_recover_start; /* gen in last recover_done cb */
  	uint32_t ls_recover_block; /* copy recover_start in last recover_prep */
  	uint32_t ls_recover_size; /* size of recover_submit, recover_result */
  	uint32_t *ls_recover_submit; /* gen in last recover_slot cb per jid */
  	uint32_t *ls_recover_result; /* result of last jid recovery */
  };
  
  struct gfs2_pcpu_lkstats {
  	/* One struct for each glock type */
  	struct gfs2_lkstats lkstats[10];
  };
  
  struct gfs2_sbd {
  	struct super_block *sd_vfs;
  	struct gfs2_pcpu_lkstats __percpu *sd_lkstats;
  	struct kobject sd_kobj;
  	unsigned long sd_flags;	/* SDF_... */
  	struct gfs2_sb_host sd_sb;
  
  	/* Constants computed on mount */
  
  	u32 sd_fsb2bb;
  	u32 sd_fsb2bb_shift;
  	u32 sd_diptrs;	/* Number of pointers in a dinode */
  	u32 sd_inptrs;	/* Number of pointers in a indirect block */
  	u32 sd_jbsize;	/* Size of a journaled data block */
  	u32 sd_hash_bsize;	/* sizeof(exhash block) */
  	u32 sd_hash_bsize_shift;
  	u32 sd_hash_ptrs;	/* Number of pointers in a hash block */
  	u32 sd_qc_per_block;
  	u32 sd_blocks_per_bitmap;
  	u32 sd_max_dirres;	/* Max blocks needed to add a directory entry */
  	u32 sd_max_height;	/* Max height of a file's metadata tree */
  	u64 sd_heightsize[GFS2_MAX_META_HEIGHT + 1];
  	u32 sd_max_dents_per_leaf; /* Max number of dirents in a leaf block */
  
  	struct gfs2_args sd_args;	/* Mount arguments */
  	struct gfs2_tune sd_tune;	/* Filesystem tuning structure */
  
  	/* Lock Stuff */
  
  	struct lm_lockstruct sd_lockstruct;
  	struct gfs2_holder sd_live_gh;
  	struct gfs2_glock *sd_rename_gl;
  	struct gfs2_glock *sd_freeze_gl;
  	struct work_struct sd_freeze_work;
  	wait_queue_head_t sd_glock_wait;
  	atomic_t sd_glock_disposal;
  	struct completion sd_locking_init;
  	struct completion sd_wdack;
  	struct delayed_work sd_control_work;
  
  	/* Inode Stuff */
  
  	struct dentry *sd_master_dir;
  	struct dentry *sd_root_dir;
  
  	struct inode *sd_jindex;
  	struct inode *sd_statfs_inode;
  	struct inode *sd_sc_inode;
  	struct inode *sd_qc_inode;
  	struct inode *sd_rindex;
  	struct inode *sd_quota_inode;
  
  	/* StatFS stuff */
  
  	spinlock_t sd_statfs_spin;
  	struct gfs2_statfs_change_host sd_statfs_master;
  	struct gfs2_statfs_change_host sd_statfs_local;
  	int sd_statfs_force_sync;
  
  	/* Resource group stuff */
  
  	int sd_rindex_uptodate;
  	spinlock_t sd_rindex_spin;
  	struct rb_root sd_rindex_tree;
  	unsigned int sd_rgrps;
  	unsigned int sd_max_rg_data;
  
  	/* Journal index stuff */
  
  	struct list_head sd_jindex_list;
  	spinlock_t sd_jindex_spin;
  	struct mutex sd_jindex_mutex;
  	unsigned int sd_journals;
  
  	struct gfs2_jdesc *sd_jdesc;
  	struct gfs2_holder sd_journal_gh;
  	struct gfs2_holder sd_jinode_gh;
  
  	struct gfs2_holder sd_sc_gh;
  	struct gfs2_holder sd_qc_gh;
  
  	struct completion sd_journal_ready;
  
  	/* Daemon stuff */
  
  	struct task_struct *sd_logd_process;
  	struct task_struct *sd_quotad_process;
  
  	/* Quota stuff */
  
  	struct list_head sd_quota_list;
  	atomic_t sd_quota_count;
  	struct mutex sd_quota_mutex;
  	struct mutex sd_quota_sync_mutex;
  	wait_queue_head_t sd_quota_wait;
  	struct list_head sd_trunc_list;
  	spinlock_t sd_trunc_lock;
  
  	unsigned int sd_quota_slots;
  	unsigned long *sd_quota_bitmap;
  	spinlock_t sd_bitmap_lock;
  
  	u64 sd_quota_sync_gen;
  
  	/* Log stuff */
  
  	struct address_space sd_aspace;
  
  	spinlock_t sd_log_lock;
  
  	struct gfs2_trans *sd_log_tr;
  	unsigned int sd_log_blks_reserved;
  	int sd_log_commited_revoke;
  
  	atomic_t sd_log_pinned;
  	unsigned int sd_log_num_revoke;
  
  	struct list_head sd_log_le_revoke;
  	struct list_head sd_log_le_ordered;
  	spinlock_t sd_ordered_lock;
  
  	atomic_t sd_log_thresh1;
  	atomic_t sd_log_thresh2;
  	atomic_t sd_log_blks_free;
  	atomic_t sd_log_blks_needed;
  	wait_queue_head_t sd_log_waitq;
  	wait_queue_head_t sd_logd_waitq;
  
  	u64 sd_log_sequence;
  	unsigned int sd_log_head;
  	unsigned int sd_log_tail;
  	int sd_log_idle;
  
  	struct rw_semaphore sd_log_flush_lock;
  	atomic_t sd_log_in_flight;
  	struct bio *sd_log_bio;
  	wait_queue_head_t sd_log_flush_wait;
  	int sd_log_error;
  
  	atomic_t sd_reserving_log;
  	wait_queue_head_t sd_reserving_log_wait;
  
  	unsigned int sd_log_flush_head;
  
  	spinlock_t sd_ail_lock;
  	struct list_head sd_ail1_list;
  	struct list_head sd_ail2_list;
  
  	/* For quiescing the filesystem */
  	struct gfs2_holder sd_freeze_gh;
  	atomic_t sd_freeze_state;
  	struct mutex sd_freeze_mutex;
  
  	char sd_fsname[GFS2_FSNAME_LEN + 3 * sizeof(int) + 2];
  	char sd_table_name[GFS2_FSNAME_LEN];
  	char sd_proto_name[GFS2_FSNAME_LEN];
  
  	/* Debugging crud */
  
  	unsigned long sd_last_warning;
  	struct dentry *debugfs_dir;    /* debugfs directory */
  };
  
  static inline void gfs2_glstats_inc(struct gfs2_glock *gl, int which)
  {
  	gl->gl_stats.stats[which]++;
  }
  
  static inline void gfs2_sbstats_inc(const struct gfs2_glock *gl, int which)
  {
  	const struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
  	preempt_disable();
  	this_cpu_ptr(sdp->sd_lkstats)->lkstats[gl->gl_name.ln_type].stats[which]++;
  	preempt_enable();
  }
  
  extern struct gfs2_rgrpd *gfs2_glock2rgrp(struct gfs2_glock *gl);
  
  static inline unsigned gfs2_max_stuffed_size(const struct gfs2_inode *ip)
  {
  	return GFS2_SB(&ip->i_inode)->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
  }
  
  #endif /* __INCORE_DOT_H__ */
  
  