/*-
* Copyright (c) 2003, 2007 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Juergen Hannken-Illjes.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#define FSS_UNCONFIG_ON_CLOSE 0x01 /* Unconfigure on last close */
#define FSS_UNLINK_ON_CREATE 0x02 /* Unlink backing store on create */
struct fss_set {
char *fss_mount; /* Mount point of file system */
char *fss_bstore; /* Path of backing store */
blksize_t fss_csize; /* Preferred cluster size */
int fss_flags; /* Initial flags */
};
struct fss_get {
char fsg_mount[MNAMELEN]; /* Mount point of file system */
struct timeval fsg_time; /* Time this snapshot was taken */
blksize_t fsg_csize; /* Current cluster size */
blkcnt_t fsg_mount_size; /* # clusters on file system */
blkcnt_t fsg_bs_size; /* # clusters on backing store */
};
struct fss_set50 {
char *fss_mount; /* Mount point of file system */
char *fss_bstore; /* Path of backing store */
blksize_t fss_csize; /* Preferred cluster size */
};
struct fss_get50 {
char fsg_mount[MNAMELEN]; /* Mount point of file system */
struct timeval50 fsg_time; /* Time this snapshot was taken */
blksize_t fsg_csize; /* Current cluster size */
blkcnt_t fsg_mount_size; /* # clusters on file system */
blkcnt_t fsg_bs_size; /* # clusters on backing store */
};
#define FSSIOCSET50 _IOW('F', 0, struct fss_set50) /* Old configure */
#define FSSIOCGET50 _IOR('F', 1, struct fss_get50) /* Old Status */
#include <sys/bufq.h>
#define FSS_CLUSTER_MAX (1<<24) /* Upper bound of clusters. The
sc_copied map uses up to
FSS_CLUSTER_MAX/NBBY bytes */
/* Offset to backing store block */
#define FSS_BTOFSB(sc, off) \
((off) >> (sc)->sc_bs_bshift)
/* Backing store block to offset */
#define FSS_FSBTOB(sc, blk) \
((off_t)(blk) << (sc)->sc_bs_bshift)
/* Offset from start of backing store block */
#define FSS_FSBOFF(sc, off) \
((off) & (sc)->sc_bs_bmask)
/* Size of backing store block */
#define FSS_FSBSIZE(sc) \
(1 << (sc)->sc_bs_bshift)
typedef enum {
FSS_READ,
FSS_WRITE
} fss_io_type;
typedef enum {
FSS_CACHE_FREE = 0, /* Cache entry is free */
FSS_CACHE_BUSY = 1, /* Cache entry is read from device */
FSS_CACHE_VALID = 2 /* Cache entry contains valid data */
} fss_cache_type;
struct fss_cache {
fss_cache_type fc_type; /* Current state */
u_int32_t fc_cluster; /* Cluster number of this entry */
kcondvar_t fc_state_cv; /* Signals state change from busy */
void * fc_data; /* Data */
};
typedef enum {
FSS_IDLE, /* Device is unconfigured */
FSS_CREATING, /* Device is currently configuring */
FSS_ACTIVE, /* Device is configured */
FSS_DESTROYING /* Device is currently unconfiguring */
} fss_state_t;
struct fss_softc {
device_t sc_dev; /* Self */
kmutex_t sc_slock; /* Protect this softc */
kcondvar_t sc_work_cv; /* Signals work for the kernel thread */
kcondvar_t sc_cache_cv; /* Signals free cache slot */
fss_state_t sc_state; /* Current state */
volatile int sc_flags; /* Flags */
#define FSS_ERROR 0x01 /* Device had errors. */
#define FSS_BS_THREAD 0x04 /* Kernel thread is running */
#define FSS_PERSISTENT 0x20 /* File system internal snapshot */
#define FSS_CDEV_OPEN 0x40 /* character device open */
#define FSS_BDEV_OPEN 0x80 /* block device open */
int sc_uflags; /* User visible flags */
struct disk *sc_dkdev; /* Generic disk device info */
struct mount *sc_mount; /* Mount point */
char sc_mntname[MNAMELEN]; /* Mount point */
struct timeval sc_time; /* Time this snapshot was taken */
dev_t sc_bdev; /* Underlying block device */
struct vnode *sc_bs_vp; /* Our backing store */
int sc_bs_bshift; /* Shift of backing store block */
u_int32_t sc_bs_bmask; /* Mask of backing store block */
struct lwp *sc_bs_lwp; /* Our kernel thread */
int sc_clshift; /* Shift of cluster size */
u_int32_t sc_clmask; /* Mask of cluster size */
u_int32_t sc_clcount; /* # clusters in file system */
u_int8_t *sc_copied; /* Map of clusters already copied */
long sc_clresid; /* Bytes in last cluster */
int sc_cache_size; /* Number of entries in sc_cache */
struct fss_cache *sc_cache; /* Cluster cache */
struct bufq_state *sc_bufq; /* Transfer queue */
u_int32_t sc_clnext; /* Next free cluster on backing store */
int sc_indir_size; /* # clusters for indirect mapping */
u_int8_t *sc_indir_valid; /* Map of valid indirect clusters */
u_int32_t sc_indir_cur; /* Current indir cluster number */
int sc_indir_dirty; /* Current indir cluster modified */
u_int32_t *sc_indir_data; /* Current indir cluster data */
};
