path: root/fs/gfs2/incore.h

/*
 * 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/workqueue.h>
#include <linux/slow-work.h>
#include <linux/dlm.h>
#include <linux/buffer_head.h>

#define DIO_WAIT	0x00000010
#define DIO_METADATA	0x00000020
#define DIO_ALL		0x00000100

struct gfs2_log_operations;
struct gfs2_log_element;
struct gfs2_holder;
struct gfs2_glock;
struct gfs2_quota_data;
struct gfs2_trans;
struct gfs2_ail;
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;
	u32 lh_hash;
};

/*
 * Structure of operations that are associated with each
 * type of element in the log.
 */

struct gfs2_log_operations {
	void (*lo_add) (struct gfs2_sbd *sdp, struct gfs2_log_element *le);
	void (*lo_before_commit) (struct gfs2_sbd *sdp);
	void (*lo_after_commit) (struct gfs2_sbd *sdp, struct gfs2_ail *ai);
	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;
};

struct gfs2_log_element {
	struct list_head le_list;
	const struct gfs2_log_operations *le_ops;
};

#define GBF_FULL 1

struct gfs2_bitmap {
	struct buffer_head *bi_bh;
	char *bi_clone;
	unsigned long bi_flags;
	u32 bi_offset;
	u32 bi_start;
	u32 bi_len;
};

struct gfs2_rgrpd {
	struct list_head rd_list;	/* Link with superblock */
	struct list_head rd_list_mru;
	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_free_clone;
	u32 rd_dinodes;
	u64 rd_igeneration;
	struct gfs2_bitmap *rd_bits;
	struct mutex rd_mutex;
	struct gfs2_log_element rd_le;
	struct gfs2_sbd *rd_sbd;
	unsigned int rd_bh_count;
	u32 rd_last_alloc;
	u32 rd_flags;
#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_MASK		0xf0000000 /* mask for internal flags */
};

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;

	union {
		struct list_head list_tr;
		u64 blkno;
	} u;
#define bd_list_tr u.list_tr
#define bd_blkno u.blkno

	struct gfs2_log_element bd_le;

	struct gfs2_ail *bd_ail;
	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

enum {
	DFL_BLOCK_LOCKS		= 0,
};

struct lm_lockname {
	u64 ln_number;
	unsigned int ln_type;
};

#define lm_name_equal(name1, name2) \
        (((name1)->ln_number == (name2)->ln_number) && \
         ((name1)->ln_type == (name2)->ln_type))


struct gfs2_glock_operations {
	void (*go_xmote_th) (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);
	int (*go_dump)(struct seq_file *seq, const struct gfs2_glock *gl);
	void (*go_callback) (struct gfs2_glock *gl);
	const int go_type;
	const unsigned long go_min_hold_time;
};

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;
	unsigned int gh_state;
	unsigned gh_flags;

	int gh_error;
	unsigned long gh_iflags; /* HIF_... */
	unsigned long gh_ip;
};

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,
};

struct gfs2_glock {
	struct hlist_node gl_list;
	unsigned long gl_flags;		/* GLF_... */
	struct lm_lockname gl_name;
	atomic_t gl_ref;

	spinlock_t gl_spin;

	unsigned int gl_state;
	unsigned int gl_target;
	unsigned int gl_reply;
	unsigned int gl_hash;
	unsigned int gl_req;
	unsigned int gl_demote_state; /* state requested by remote node */
	unsigned long gl_demote_time; /* time of first demote request */
	struct list_head gl_holders;

	const struct gfs2_glock_operations *gl_ops;
	char gl_strname[GDLM_STRNAME_BYTES];
	struct dlm_lksb gl_lksb;
	char gl_lvb[32];
	unsigned long gl_tchange;
	void *gl_object;

	struct list_head gl_lru;

	struct gfs2_sbd *gl_sbd;

	struct inode *gl_aspace;
	struct list_head gl_ail_list;
	atomic_t gl_ail_count;
	struct delayed_work gl_work;
	struct work_struct gl_delete;
};

#define GFS2_MIN_LVB_SIZE 32	/* Min size of LVB that gfs2 supports */

struct gfs2_alloc