187 lines
6.6 KiB
C
187 lines
6.6 KiB
C
/* $NetBSD: fssvar.h,v 1.16 2007/07/09 21:00:28 ad Exp $ */
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/*-
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* Copyright (c) 2003, 2007 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Juergen Hannken-Illjes.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _SYS_DEV_FSSVAR_H
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#define _SYS_DEV_FSSVAR_H
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#define FSS_UNCONFIG_ON_CLOSE 0x01 /* Unconfigure on last close */
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struct fss_set {
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char *fss_mount; /* Mount point of file system */
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char *fss_bstore; /* Path of backing store */
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blksize_t fss_csize; /* Preferred cluster size */
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};
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struct fss_get {
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char fsg_mount[MNAMELEN]; /* Mount point of file system */
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struct timeval fsg_time; /* Time this snapshot was taken */
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blksize_t fsg_csize; /* Current cluster size */
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blkcnt_t fsg_mount_size; /* # clusters on file system */
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blkcnt_t fsg_bs_size; /* # clusters on backing store */
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};
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#define FSSIOCSET _IOW('F', 0, struct fss_set) /* Configure */
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#define FSSIOCGET _IOR('F', 1, struct fss_get) /* Status */
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#define FSSIOCCLR _IO('F', 2) /* Unconfigure */
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#define FSSIOFSET _IOW('F', 3, int) /* Set flags */
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#define FSSIOFGET _IOR('F', 4, int) /* Get flags */
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#ifdef _KERNEL
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#include <sys/bufq.h>
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#define FSS_CLUSTER_MAX (1<<24) /* Upper bound of clusters. The
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sc_copied map uses up to
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FSS_CLUSTER_MAX/NBBY bytes */
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#define FSS_LOCK(sc, s) \
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do { \
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(s) = splbio(); \
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simple_lock(&(sc)->sc_slock); \
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} while (/*CONSTCOND*/0)
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#define FSS_UNLOCK(sc, s) \
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do { \
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simple_unlock(&(sc)->sc_slock); \
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splx((s)); \
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} while (/*CONSTCOND*/0)
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/* Device to softc, NULL on error */
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#define FSS_DEV_TO_SOFTC(dev) \
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(minor((dev)) < 0 || minor((dev)) >= NFSS ? NULL : \
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&fss_softc[minor((dev))])
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/* Check if still valid */
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#define FSS_ISVALID(sc) \
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(((sc)->sc_flags & (FSS_ACTIVE|FSS_ERROR)) == FSS_ACTIVE)
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/* Offset to cluster */
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#define FSS_BTOCL(sc, off) \
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((off) >> (sc)->sc_clshift)
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/* Cluster to offset */
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#define FSS_CLTOB(sc, cl) \
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((off_t)(cl) << (sc)->sc_clshift)
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/* Offset from start of cluster */
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#define FSS_CLOFF(sc, off) \
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((off) & (sc)->sc_clmask)
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/* Size of cluster */
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#define FSS_CLSIZE(sc) \
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(1 << (sc)->sc_clshift)
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/* Offset to backing store block */
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#define FSS_BTOFSB(sc, off) \
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((off) >> (sc)->sc_bs_bshift)
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/* Backing store block to offset */
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#define FSS_FSBTOB(sc, blk) \
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((off_t)(blk) << (sc)->sc_bs_bshift)
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/* Offset from start of backing store block */
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#define FSS_FSBOFF(sc, off) \
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((off) & (sc)->sc_bs_bmask)
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/* Size of backing store block */
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#define FSS_FSBSIZE(sc) \
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(1 << (sc)->sc_bs_bshift)
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typedef enum {
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FSS_READ,
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FSS_WRITE
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} fss_io_type;
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typedef enum {
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FSS_CACHE_FREE = 0, /* Cache entry is free */
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FSS_CACHE_BUSY = 1, /* Cache entry is read from device */
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FSS_CACHE_VALID = 2 /* Cache entry contains valid data */
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} fss_cache_type;
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struct fss_cache {
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fss_cache_type fc_type; /* Current state */
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struct fss_softc *fc_softc; /* Backlink to our softc */
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volatile int fc_xfercount; /* Number of outstanding transfers */
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u_int32_t fc_cluster; /* Cluster number of this entry */
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void * fc_data; /* Data */
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};
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struct fss_softc {
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int sc_unit; /* Logical unit number */
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struct simplelock sc_slock; /* Protect this softc */
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kmutex_t sc_lock; /* Sleep lock for fss_ioctl */
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volatile int sc_flags; /* Flags */
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#define FSS_ACTIVE 0x01 /* Snapshot is active */
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#define FSS_ERROR 0x02 /* I/O error occurred */
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#define FSS_BS_THREAD 0x04 /* Kernel thread is running */
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#define FSS_PERSISTENT 0x20 /* File system internal snapshot */
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#define FSS_CDEV_OPEN 0x40 /* character device open */
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#define FSS_BDEV_OPEN 0x80 /* block device open */
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int sc_uflags; /* User visible flags */
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struct mount *sc_mount; /* Mount point */
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char sc_mntname[MNAMELEN]; /* Mount point */
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struct timeval sc_time; /* Time this snapshot was taken */
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dev_t sc_bdev; /* Underlying block device */
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struct vnode *sc_mount_vp; /* Underlying spec vnode */
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struct vnode *sc_bs_vp; /* Our backing store */
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off_t sc_bs_size; /* Its size in bytes */
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int sc_bs_bshift; /* Shift of backing store block */
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u_int32_t sc_bs_bmask; /* Mask of backing store block */
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struct lwp *sc_bs_lwp; /* Our kernel thread */
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int sc_clshift; /* Shift of cluster size */
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u_int32_t sc_clmask; /* Mask of cluster size */
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u_int32_t sc_clcount; /* # clusters in file system */
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u_int8_t *sc_copied; /* Map of clusters already copied */
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long sc_clresid; /* Bytes in last cluster */
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int sc_cache_size; /* Number of entries in sc_cache */
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struct fss_cache *sc_cache; /* Cluster cache */
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struct bufq_state *sc_bufq; /* Transfer queue */
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u_int32_t sc_clnext; /* Next free cluster on backing store */
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int sc_indir_size; /* # clusters for indirect mapping */
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u_int8_t *sc_indir_valid; /* Map of valid indirect clusters */
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u_int32_t sc_indir_cur; /* Current indir cluster number */
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int sc_indir_dirty; /* Current indir cluster modified */
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u_int32_t *sc_indir_data; /* Current indir cluster data */
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};
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int fss_umount_hook(struct mount *, int);
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#endif /* _KERNEL */
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#endif /* !_SYS_DEV_FSSVAR_H */
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