1 /* $NetBSD: fssvar.h,v 1.6 2004/05/25 14:54:56 hannken 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 #define FSS_CLUSTER_MAX (1<<24) /* Upper bound of clusters. The 63 sc_copied map uses up to 64 FSS_CLUSTER_MAX/NBBY bytes */ 65 66 #define FSS_LOCK(sc, s) \ 67 do { \ 68 (s) = splbio(); \ 69 simple_lock(&(sc)->sc_slock); \ 70 } while (/*CONSTCOND*/0) 71 72 #define FSS_UNLOCK(sc, s) \ 73 do { \ 74 simple_unlock(&(sc)->sc_slock); \ 75 splx((s)); \ 76 } while (/*CONSTCOND*/0) 77 78 /* Device to softc, NULL on error */ 79 #define FSS_DEV_TO_SOFTC(dev) \ 80 (minor((dev)) < 0 || minor((dev)) >= NFSS ? NULL : \ 81 &fss_softc[minor((dev))]) 82 83 /* Check if still valid */ 84 #define FSS_ISVALID(sc) \ 85 (((sc)->sc_flags & (FSS_ACTIVE|FSS_ERROR)) == FSS_ACTIVE) 86 87 /* Offset to cluster */ 88 #define FSS_BTOCL(sc, off) \ 89 ((off) >> (sc)->sc_clshift) 90 91 /* Cluster to offset */ 92 #define FSS_CLTOB(sc, cl) \ 93 ((off_t)(cl) << (sc)->sc_clshift) 94 95 /* Offset from start of cluster */ 96 #define FSS_CLOFF(sc, off) \ 97 ((off) & (sc)->sc_clmask) 98 99 /* Size of cluster */ 100 #define FSS_CLSIZE(sc) \ 101 (1 << (sc)->sc_clshift) 102 103 /* Offset to backing store block */ 104 #define FSS_BTOFSB(sc, off) \ 105 ((off) >> (sc)->sc_bs_bshift) 106 107 /* Backing store block to offset */ 108 #define FSS_FSBTOB(sc, blk) \ 109 ((off_t)(blk) << (sc)->sc_bs_bshift) 110 111 /* Offset from start of backing store block */ 112 #define FSS_FSBOFF(sc, off) \ 113 ((off) & (sc)->sc_bs_bmask) 114 115 /* Size of backing store block */ 116 #define FSS_FSBSIZE(sc) \ 117 (1 << (sc)->sc_bs_bshift) 118 119 typedef enum { 120 FSS_READ, 121 FSS_WRITE 122 } fss_io_type; 123 124 typedef enum { 125 FSS_CACHE_FREE = 0, /* Cache entry is free */ 126 FSS_CACHE_BUSY = 1, /* Cache entry is read from device */ 127 FSS_CACHE_VALID = 2 /* Cache entry contains valid data */ 128 } fss_cache_type; 129 130 struct fss_cache { 131 fss_cache_type fc_type; /* Current state */ 132 struct fss_softc *fc_softc; /* Backlink to our softc */ 133 volatile int fc_xfercount; /* Number of outstanding transfers */ 134 u_int32_t fc_cluster; /* Cluster number of this entry */ 135 caddr_t fc_data; /* Data */ 136 }; 137 138 struct fss_softc { 139 int sc_unit; /* Logical unit number */ 140 struct simplelock sc_slock; /* Protect this softc */ 141 volatile int sc_flags; /* Flags */ 142 #define FSS_ACTIVE 0x01 /* Snapshot is active */ 143 #define FSS_ERROR 0x02 /* I/O error occurred */ 144 #define FSS_BS_THREAD 0x04 /* Kernel thread is running */ 145 #define FSS_EXCL 0x08 /* Exclusive access granted */ 146 #define FSS_BS_ALLOC 0x10 /* Allocate backing store */ 147 #define FSS_PERSISTENT 0x20 /* File system internal snapshot */ 148 struct mount *sc_mount; /* Mount point */ 149 char sc_mntname[MNAMELEN]; /* Mount point */ 150 struct timeval sc_time; /* Time this snapshot was taken */ 151 dev_t sc_bdev; /* Underlying block device */ 152 struct vnode *sc_mount_vp; /* Underlying spec vnode */ 153 struct vnode *sc_bs_vp; /* Our backing store */ 154 off_t sc_bs_size; /* Its size in bytes */ 155 int sc_bs_bshift; /* Shift of backing store block */ 156 u_int32_t sc_bs_bmask; /* Mask of backing store block */ 157 struct proc *sc_bs_proc; /* Our kernel thread */ 158 int sc_clshift; /* Shift of cluster size */ 159 u_int32_t sc_clmask; /* Mask of cluster size */ 160 u_int32_t sc_clcount; /* # clusters in file system */ 161 u_int8_t *sc_copied; /* Map of clusters already copied */ 162 long sc_clresid; /* Bytes in last cluster */ 163 int sc_cache_size; /* Number of entries in sc_cache */ 164 struct fss_cache *sc_cache; /* Cluster cache */ 165 struct bufq_state sc_bufq; /* Transfer queue */ 166 u_int32_t sc_clnext; /* Next free cluster on backing store */ 167 int sc_indir_size; /* # clusters for indirect mapping */ 168 u_int8_t *sc_indir_valid; /* Map of valid indirect clusters */ 169 u_int32_t sc_indir_cur; /* Current indir cluster number */ 170 int sc_indir_dirty; /* Current indir cluster modified */ 171 u_int32_t *sc_indir_data; /* Current indir cluster data */ 172 }; 173 174 int fss_umount_hook(struct mount *, int); 175 176 #endif /* _KERNEL */ 177 178 #endif /* !_SYS_DEV_FSSVAR_H */ 179