1 /* $NetBSD: fssvar.h,v 1.27 2011/11/29 20:56:12 bouyer Exp $ */ 2 3 /*- 4 * Copyright (c) 2003, 2007 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _SYS_DEV_FSSVAR_H 33 #define _SYS_DEV_FSSVAR_H 34 35 #include <sys/simplelock.h> 36 37 #define FSS_UNCONFIG_ON_CLOSE 0x01 /* Unconfigure on last close */ 38 #define FSS_UNLINK_ON_CREATE 0x02 /* Unlink backing store on create */ 39 40 struct fss_set { 41 char *fss_mount; /* Mount point of file system */ 42 char *fss_bstore; /* Path of backing store */ 43 blksize_t fss_csize; /* Preferred cluster size */ 44 int fss_flags; /* Initial flags */ 45 }; 46 47 struct fss_get { 48 char fsg_mount[MNAMELEN]; /* Mount point of file system */ 49 struct timeval fsg_time; /* Time this snapshot was taken */ 50 blksize_t fsg_csize; /* Current cluster size */ 51 blkcnt_t fsg_mount_size; /* # clusters on file system */ 52 blkcnt_t fsg_bs_size; /* # clusters on backing store */ 53 }; 54 55 #define FSSIOCSET _IOW('F', 5, struct fss_set) /* Configure */ 56 #define FSSIOCGET _IOR('F', 1, struct fss_get) /* Status */ 57 #define FSSIOCCLR _IO('F', 2) /* Unconfigure */ 58 #define FSSIOFSET _IOW('F', 3, int) /* Set flags */ 59 #define FSSIOFGET _IOR('F', 4, int) /* Get flags */ 60 #ifdef _KERNEL 61 #include <compat/sys/time_types.h> 62 63 struct fss_set50 { 64 char *fss_mount; /* Mount point of file system */ 65 char *fss_bstore; /* Path of backing store */ 66 blksize_t fss_csize; /* Preferred cluster size */ 67 }; 68 69 struct fss_get50 { 70 char fsg_mount[MNAMELEN]; /* Mount point of file system */ 71 struct timeval50 fsg_time; /* Time this snapshot was taken */ 72 blksize_t fsg_csize; /* Current cluster size */ 73 blkcnt_t fsg_mount_size; /* # clusters on file system */ 74 blkcnt_t fsg_bs_size; /* # clusters on backing store */ 75 }; 76 77 #define FSSIOCSET50 _IOW('F', 0, struct fss_set50) /* Old configure */ 78 #define FSSIOCGET50 _IOR('F', 1, struct fss_get50) /* Old Status */ 79 80 #include <sys/bufq.h> 81 82 #define FSS_CLUSTER_MAX (1<<24) /* Upper bound of clusters. The 83 sc_copied map uses up to 84 FSS_CLUSTER_MAX/NBBY bytes */ 85 86 /* Check if still valid */ 87 #define FSS_ISVALID(sc) \ 88 (((sc)->sc_flags & (FSS_ACTIVE|FSS_ERROR)) == FSS_ACTIVE) 89 90 /* Offset to cluster */ 91 #define FSS_BTOCL(sc, off) \ 92 ((off) >> (sc)->sc_clshift) 93 94 /* Cluster to offset */ 95 #define FSS_CLTOB(sc, cl) \ 96 ((off_t)(cl) << (sc)->sc_clshift) 97 98 /* Offset from start of cluster */ 99 #define FSS_CLOFF(sc, off) \ 100 ((off) & (sc)->sc_clmask) 101 102 /* Size of cluster */ 103 #define FSS_CLSIZE(sc) \ 104 (1 << (sc)->sc_clshift) 105 106 /* Offset to backing store block */ 107 #define FSS_BTOFSB(sc, off) \ 108 ((off) >> (sc)->sc_bs_bshift) 109 110 /* Backing store block to offset */ 111 #define FSS_FSBTOB(sc, blk) \ 112 ((off_t)(blk) << (sc)->sc_bs_bshift) 113 114 /* Offset from start of backing store block */ 115 #define FSS_FSBOFF(sc, off) \ 116 ((off) & (sc)->sc_bs_bmask) 117 118 /* Size of backing store block */ 119 #define FSS_FSBSIZE(sc) \ 120 (1 << (sc)->sc_bs_bshift) 121 122 typedef enum { 123 FSS_READ, 124 FSS_WRITE 125 } fss_io_type; 126 127 typedef enum { 128 FSS_CACHE_FREE = 0, /* Cache entry is free */ 129 FSS_CACHE_BUSY = 1, /* Cache entry is read from device */ 130 FSS_CACHE_VALID = 2 /* Cache entry contains valid data */ 131 } fss_cache_type; 132 133 struct fss_cache { 134 fss_cache_type fc_type; /* Current state */ 135 u_int32_t fc_cluster; /* Cluster number of this entry */ 136 kcondvar_t fc_state_cv; /* Signals state change from busy */ 137 void * fc_data; /* Data */ 138 }; 139 140 struct fss_softc { 141 device_t sc_dev; /* Self */ 142 kmutex_t sc_slock; /* Protect this softc */ 143 kmutex_t sc_lock; /* Sleep lock for fss_ioctl */ 144 kcondvar_t sc_work_cv; /* Signals work for the kernel thread */ 145 kcondvar_t sc_cache_cv; /* Signals free cache slot */ 146 volatile int sc_flags; /* Flags */ 147 #define FSS_ACTIVE 0x01 /* Snapshot is active */ 148 #define FSS_ERROR 0x02 /* I/O error occurred */ 149 #define FSS_BS_THREAD 0x04 /* Kernel thread is running */ 150 #define FSS_PERSISTENT 0x20 /* File system internal snapshot */ 151 #define FSS_CDEV_OPEN 0x40 /* character device open */ 152 #define FSS_BDEV_OPEN 0x80 /* block device open */ 153 int sc_uflags; /* User visible flags */ 154 struct disk *sc_dkdev; /* Generic disk device info */ 155 struct mount *sc_mount; /* Mount point */ 156 char sc_mntname[MNAMELEN]; /* Mount point */ 157 struct timeval sc_time; /* Time this snapshot was taken */ 158 dev_t sc_bdev; /* Underlying block device */ 159 struct vnode *sc_bs_vp; /* Our backing store */ 160 int sc_bs_bshift; /* Shift of backing store block */ 161 u_int32_t sc_bs_bmask; /* Mask of backing store block */ 162 struct lwp *sc_bs_lwp; /* Our kernel thread */ 163 int sc_clshift; /* Shift of cluster size */ 164 u_int32_t sc_clmask; /* Mask of cluster size */ 165 u_int32_t sc_clcount; /* # clusters in file system */ 166 u_int8_t *sc_copied; /* Map of clusters already copied */ 167 long sc_clresid; /* Bytes in last cluster */ 168 int sc_cache_size; /* Number of entries in sc_cache */ 169 struct fss_cache *sc_cache; /* Cluster cache */ 170 struct bufq_state *sc_bufq; /* Transfer queue */ 171 u_int32_t sc_clnext; /* Next free cluster on backing store */ 172 int sc_indir_size; /* # clusters for indirect mapping */ 173 u_int8_t *sc_indir_valid; /* Map of valid indirect clusters */ 174 u_int32_t sc_indir_cur; /* Current indir cluster number */ 175 int sc_indir_dirty; /* Current indir cluster modified */ 176 u_int32_t *sc_indir_data; /* Current indir cluster data */ 177 }; 178 179 #endif /* _KERNEL */ 180 181 #endif /* !_SYS_DEV_FSSVAR_H */ 182