fssvar.h revision 1.8
1 /* $NetBSD: fssvar.h,v 1.8 2005/02/27 00:26:58 perry Exp $ */ 2 3 /*- 4 * Copyright (c) 2003 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Juergen Hannken-Illjes. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #ifndef _SYS_DEV_FSSVAR_H 40 #define _SYS_DEV_FSSVAR_H 41 42 struct fss_set { 43 char *fss_mount; /* Mount point of file system */ 44 char *fss_bstore; /* Path of backing store */ 45 blksize_t fss_csize; /* Preferred cluster size */ 46 }; 47 48 struct fss_get { 49 char fsg_mount[MNAMELEN]; /* Mount point of file system */ 50 struct timeval fsg_time; /* Time this snapshot was taken */ 51 blksize_t fsg_csize; /* Current cluster size */ 52 blkcnt_t fsg_mount_size; /* # clusters on file system */ 53 blkcnt_t fsg_bs_size; /* # clusters on backing store */ 54 }; 55 56 #define FSSIOCSET _IOW('F', 0, struct fss_set) /* Configure */ 57 #define FSSIOCGET _IOR('F', 1, struct fss_get) /* Status */ 58 #define FSSIOCCLR _IO('F', 2) /* Unconfigure */ 59 60 #ifdef _KERNEL 61 62 #include <sys/bufq.h> 63 64 #define FSS_CLUSTER_MAX (1<<24) /* Upper bound of clusters. The 65 sc_copied map uses up to 66 FSS_CLUSTER_MAX/NBBY bytes */ 67 68 #define FSS_LOCK(sc, s) \ 69 do { \ 70 (s) = splbio(); \ 71 simple_lock(&(sc)->sc_slock); \ 72 } while (/*CONSTCOND*/0) 73 74 #define FSS_UNLOCK(sc, s) \ 75 do { \ 76 simple_unlock(&(sc)->sc_slock); \ 77 splx((s)); \ 78 } while (/*CONSTCOND*/0) 79 80 /* Device to softc, NULL on error */ 81 #define FSS_DEV_TO_SOFTC(dev) \ 82 (minor((dev)) < 0 || minor((dev)) >= NFSS ? NULL : \ 83 &fss_softc[minor((dev))]) 84 85 /* Check if still valid */ 86 #define FSS_ISVALID(sc) \ 87 (((sc)->sc_flags & (FSS_ACTIVE|FSS_ERROR)) == FSS_ACTIVE) 88 89 /* Offset to cluster */ 90 #define FSS_BTOCL(sc, off) \ 91 ((off) >> (sc)->sc_clshift) 92 93 /* Cluster to offset */ 94 #define FSS_CLTOB(sc, cl) \ 95 ((off_t)(cl) << (sc)->sc_clshift) 96 97 /* Offset from start of cluster */ 98 #define FSS_CLOFF(sc, off) \ 99 ((off) & (sc)->sc_clmask) 100 101 /* Size of cluster */ 102 #define FSS_CLSIZE(sc) \ 103 (1 << (sc)->sc_clshift) 104 105 /* Offset to backing store block */ 106 #define FSS_BTOFSB(sc, off) \ 107 ((off) >> (sc)->sc_bs_bshift) 108 109 /* Backing store block to offset */ 110 #define FSS_FSBTOB(sc, blk) \ 111 ((off_t)(blk) << (sc)->sc_bs_bshift) 112 113 /* Offset from start of backing store block */ 114 #define FSS_FSBOFF(sc, off) \ 115 ((off) & (sc)->sc_bs_bmask) 116 117 /* Size of backing store block */ 118 #define FSS_FSBSIZE(sc) \ 119 (1 << (sc)->sc_bs_bshift) 120 121 typedef enum { 122 FSS_READ, 123 FSS_WRITE 124 } fss_io_type; 125 126 typedef enum { 127 FSS_CACHE_FREE = 0, /* Cache entry is free */ 128 FSS_CACHE_BUSY = 1, /* Cache entry is read from device */ 129 FSS_CACHE_VALID = 2 /* Cache entry contains valid data */ 130 } fss_cache_type; 131 132 struct fss_cache { 133 fss_cache_type fc_type; /* Current state */ 134 struct fss_softc *fc_softc; /* Backlink to our softc */ 135 volatile int fc_xfercount; /* Number of outstanding transfers */ 136 u_int32_t fc_cluster; /* Cluster number of this entry */ 137 caddr_t fc_data; /* Data */ 138 }; 139 140 struct fss_softc { 141 int sc_unit; /* Logical unit number */ 142 struct simplelock sc_slock; /* Protect this softc */ 143 volatile int sc_flags; /* Flags */ 144 #define FSS_ACTIVE 0x01 /* Snapshot is active */ 145 #define FSS_ERROR 0x02 /* I/O error occurred */ 146 #define FSS_BS_THREAD 0x04 /* Kernel thread is running */ 147 #define FSS_EXCL 0x08 /* Exclusive access granted */ 148 #define FSS_BS_ALLOC 0x10 /* Allocate backing store */ 149 #define FSS_PERSISTENT 0x20 /* File system internal snapshot */ 150 struct mount *sc_mount; /* Mount point */ 151 char sc_mntname[MNAMELEN]; /* Mount point */ 152 struct timeval sc_time; /* Time this snapshot was taken */ 153 dev_t sc_bdev; /* Underlying block device */ 154 struct vnode *sc_mount_vp; /* Underlying spec vnode */ 155 struct vnode *sc_bs_vp; /* Our backing store */ 156 off_t sc_bs_size; /* Its size in bytes */ 157 int sc_bs_bshift; /* Shift of backing store block */ 158 u_int32_t sc_bs_bmask; /* Mask of backing store block */ 159 struct proc *sc_bs_proc; /* Our kernel thread */ 160 int sc_clshift; /* Shift of cluster size */ 161 u_int32_t sc_clmask; /* Mask of cluster size */ 162 u_int32_t sc_clcount; /* # clusters in file system */ 163 u_int8_t *sc_copied; /* Map of clusters already copied */ 164 long sc_clresid; /* Bytes in last cluster */ 165 int sc_cache_size; /* Number of entries in sc_cache */ 166 struct fss_cache *sc_cache; /* Cluster cache */ 167 struct bufq_state sc_bufq; /* Transfer queue */ 168 u_int32_t sc_clnext; /* Next free cluster on backing store */ 169 int sc_indir_size; /* # clusters for indirect mapping */ 170 u_int8_t *sc_indir_valid; /* Map of valid indirect clusters */ 171 u_int32_t sc_indir_cur; /* Current indir cluster number */ 172 int sc_indir_dirty; /* Current indir cluster modified */ 173 u_int32_t *sc_indir_data; /* Current indir cluster data */ 174 }; 175 176 int fss_umount_hook(struct mount *, int); 177 178 #endif /* _KERNEL */ 179 180 #endif /* !_SYS_DEV_FSSVAR_H */ 181
Indexes created Mon Sep 22 10:09:38 GMT 2025