/*
 * Copyright 2000, International Business Machines Corporation and others.
 * All Rights Reserved.
 * 
 * This software has been released under the terms of the IBM Public
 * License.  For details, see the LICENSE file in the top-level source
 * directory or online at http://www.openafs.org/dl/license10.html
 *
 * Portions Copyright (c) 2006 Sine Nomine Associates
 */

/*
	System:		VICE-TWO
	Module:		partition.h
	Institution:	The Information Technology Center, Carnegie-Mellon University

 */

#include <afs/param.h>
#include "nfs.h"
#if	defined(AFS_HPUX_ENV)
#define	AFS_DSKDEV	"/dev/dsk"
#define	AFS_RDSKDEV	"/dev/rdsk/"
#define	AFS_LVOLDEV	"/dev/vg0"
#define	AFS_ACVOLDEV	"/dev/ac"
#define	AFS_RACVOLDEV	"/dev/ac/r"
#else
#define	AFS_DSKDEV	"/dev"
#define	AFS_RDSKDEV	"/dev/r"
#endif


/* All Vice partitions on a server will have the following name prefix */
#define VICE_PARTITION_PREFIX	"/vicep"
#define VICE_PREFIX_SIZE	(sizeof(VICE_PARTITION_PREFIX)-1)

/* If a file by this name exists in a /vicepX directory, it means that
 * this directory should be used as an AFS partition even if it's not
 * on a separate partition (for instance if it's part of a large /).
 * This feature only works with the NAMEI fileserver.
 */
#ifdef AFS_NAMEI_ENV
#define VICE_ALWAYSATTACH_FILE	"AlwaysAttach"
#endif

/* For NT, the roles of "name" and "devName" are reversed. That is, "name"
 * refers to the drive letter name and "devName" refers to the /vicep style
 * or name. The reason for this is that a lot of places assume that "name"
 * is the right thing to use to access the partition. Silly of them isn't it?
 * The NT version of VInitPartition does the intial setup. There is an NT
 * variant for VGetPartition as well. Also, the VolPartitionInfo RPC does
 * a swap before sending the data out on the wire.
 */
struct DiskPartition {
    struct DiskPartition *next;
    char *name;			/* Mounted partition name */
    char *devName;		/* Device mounted on */
    Device device;		/* device number */
    afs_int32 index;            /* partition index (0<=x<=VOLMAXPARTS) */
    int lock_fd;		/* File descriptor of this partition if locked; otherwise -1;
				 * Not used by the file server */
    int free;			/* Total number of blocks (1K) presumed
				 * available on this partition (accounting
				 * for the minfree parameter for the
				 * partition).  This is adjusted
				 * approximately by the sizes of files
				 * and directories read/written, and
				 * periodically the superblock is read and
				 * this is recomputed.  This number can
				 * be negative, if the partition starts
				 * out too full */
    int totalUsable;		/* Total number of blocks available on this
				 * partition, taking into account the minfree
				 * parameter for the partition (see the
				 * 4.2bsd command tunefs, but note that the
				 * bug mentioned there--that the superblock
				 * is not reread--does not apply here.  The
				 * superblock is re-read periodically by
				 * VSetPartitionDiskUsage().) */
    int minFree;		/* Number blocks to be kept free, as last read
				 * from the superblock */
    int flags;
    int f_files;		/* total number of files in this partition */
#ifdef AFS_DEMAND_ATTACH_FS
    struct {
	struct rx_queue head;   /* list of volumes on this partition (VByPList) */
	afs_uint32 len;         /* length of volume list */
	int busy;               /* asynch vol list op in progress */
	pthread_cond_t cv;      /* vol_list.busy change cond var */
    } vol_list;
#endif /* AFS_DEMAND_ATTACH_FS */
};

struct DiskPartitionStats {
    afs_int32 free;
    afs_int32 totalUsable;
    afs_int32 minFree;
    afs_int32 f_files;
#ifdef AFS_DEMAND_ATTACH_FS
    afs_int32 vol_list_len;
#endif
};

#define	PART_DONTUPDATE	1
#define PART_DUPLICATE  2	/* NT - used if we find more than one partition 
				 * using the same drive. Will be dumped before
				 * all partitions attached.
				 */

#ifdef AFS_NT40_ENV
#include <WINNT/vptab.h>
extern int VValidVPTEntry(struct vptab *vptp);
#endif


struct Volume;			/* Potentially forward definition */

extern struct DiskPartition *DiskPartitionList;
extern struct DiskPartition *VGetPartition(char * name, int abortp);
extern struct DiskPartition *VGetPartition_r(char * name, int abortp);
#ifdef AFS_DEMAND_ATTACH_FS
extern struct DiskPartition *VGetPartitionById(afs_int32 index, int abortp);
extern struct DiskPartition *VGetPartitionById_r(afs_int32 index, int abortp);
#endif
extern int VAttachPartitions(void);
extern void VLockPartition(char *name);
extern void VLockPartition_r(char *name);
extern void VUnlockPartition(char *name);
extern void VUnlockPartition_r(char *name);
extern void VResetDiskUsage(void);
extern void VResetDiskUsage_r(void);
extern void VSetPartitionDiskUsage(register struct DiskPartition *dp);
extern void VSetPartitionDiskUsage_r(register struct DiskPartition *dp);
extern char *VPartitionPath(struct DiskPartition *p);
extern void VAdjustDiskUsage(Error * ec, struct Volume *vp,
			     afs_sfsize_t blocks, afs_sfsize_t checkBlocks);
extern int VDiskUsage(struct Volume *vp, afs_sfsize_t blocks);
extern void VPrintDiskStats(void);
extern int VInitPartitionPackage(void);
