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    Subject[PATCH 31/44 take 2] [UBI] accounting unit header
    diff -auNrp tmp-from/drivers/mtd/ubi/account.h tmp-to/drivers/mtd/ubi/account.h
    --- tmp-from/drivers/mtd/ubi/account.h 1970-01-01 02:00:00.000000000 +0200
    +++ tmp-to/drivers/mtd/ubi/account.h 2007-02-17 18:07:27.000000000 +0200
    @@ -0,0 +1,118 @@
    +/*
    + * Copyright (c) International Business Machines Corp., 2006
    + *
    + * 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 02111-1307 USA
    + *
    + * Author: Artem B. Bityutskiy
    + */
    +
    +/*
    + * UBI accounting unit.
    + *
    + * This unit is responsible for maintaining the correct physical eraseblock
    + * accounting to prevent overcommitment.
    + */
    +
    +#ifndef __UBI_ACCOUNT_H__
    +#define __UBI_ACCOUNT_H__
    +
    +#include <linux/spinlock.h>
    +
    +struct ubi_info;
    +struct ubi_scan_info;
    +
    +/**
    + * ubi_acc_mkvol - account creation of a volume.
    + *
    + * @ubi: the UBI device description object
    + * @reserved_pebs: how many eraseblocks are reserved for the volume
    + *
    + * This function reserves @reserved_pebs physical eraseblocks for the newly
    + * created volume. Returns zero in case of success and a %-ENOSPC if there are
    + * no enough physical eraseblocks.
    + */
    +int ubi_acc_mkvol(const struct ubi_info *ubi, int reserved_pebs);
    +
    +/**
    + * ubi_acc_rmvol - account removal of a volume.
    + *
    + * @ubi: the UBI device description object
    + * @reserved_pebs: how many eraseblocks were reserved for the volume
    + *
    + * This function reclaims the physical eraseblocks occupied by a volume. Note,
    + * UBI is trying to maintain a constant level of physical eraseblock reserved
    + * for bad PEB handling. So, if there is a lack of reserved physical
    + * eraseblock, this function will reserve them at once.
    + */
    +void ubi_acc_rmvol(const struct ubi_info *ubi, int reserved_pebs);
    +
    +/**
    + * ubi_acc_reserve - reserve a number of physical eraseblocks.
    + *
    + * @ubi: the UBI device description object
    + * @pebs: how many physical eraseblocks to reserve
    + *
    + * This function returns zero in case of success and %-ENOSPC if there are no
    + * enough physical eraseblocks.
    + */
    +int ubi_acc_reserve(const struct ubi_info *ubi, int pebs);
    +
    +/**
    + * ubi_acc_free - free a number of reserved physical eraseblocks.
    + *
    + * @ubi: the UBI device description object
    + * @pebs: how many physical eraseblocks to free
    + */
    +void ubi_acc_free(const struct ubi_info *ubi, int pebs);
    +
    +/**
    + * ubi_acc_init_scan - initialize the accounting unit using scanning
    + * information.
    + *
    + * @ubi: the UBI device description object
    + * @si: a pointer to the scanning information
    + *
    + * This function returns zero in case of success and a negative error code in
    + * case of failure.
    + */
    +int ubi_acc_init_scan(struct ubi_info *ubi, struct ubi_scan_info *si);
    +
    +/**
    + * ubi_acc_close - close the accounting unit.
    + *
    + * @ubi: the UBI device description object
    + */
    +void ubi_acc_close(const struct ubi_info *ubi);
    +
    +/**
    + * struct ubi_acc_info - the UBI accounting unit's description data structure.
    + *
    + * @ivol_count: count of internal volumes
    + * @uvol_count: count of user volumes
    + * @rsvd_pebs: count of reserved physical eraseblocks
    + * @avail_pebs: count of available physical eraseblocks
    + * @max_volumes: maximum number of volumes that users may create
    + * @lock: protects the accounting data
    + */
    +struct ubi_acc_info {
    + int ivol_count; /* public */
    + int uvol_count; /* public */
    + int rsvd_pebs; /* public */
    + int avail_pebs; /* public */
    + int max_volumes; /* public */
    + spinlock_t lock; /* private */
    +};
    +
    +#endif /* !__UBI_ACCOUNT_H__ */
    -
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