fssvar.h revision 1.26
1 /* $NetBSD: fssvar.h,v 1.26 2011/11/29 19:17:03 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_set50 { 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 }; 45 46 struct fss_set { 47 char *fss_mount; /* Mount point of file system */ 48 char *fss_bstore; /* Path of backing store */ 49 blksize_t fss_csize; /* Preferred cluster size */ 50 int fss_flags; /* Initial flags */ 51 }; 52 53 struct fss_get { 54 char fsg_mount[MNAMELEN]; /* Mount point of file system */ 55 struct timeval fsg_time; /* Time this snapshot was taken */ 56 blksize_t fsg_csize; /* Current cluster size */ 57 blkcnt_t fsg_mount_size; /* # clusters on file system */ 58 blkcnt_t fsg_bs_size; /* # clusters on backing store */ 59 }; 60 61 #define FSSIOCSET _IOW('F', 5, struct fss_set) /* Configure */ 62 #define FSSIOCGET _IOR('F', 1, struct fss_get) /* Status */ 63 #define FSSIOCCLR _IO('F', 2) /* Unconfigure */ 64 #define FSSIOFSET _IOW('F', 3, int) /* Set flags */ 65 #define FSSIOFGET _IOR('F', 4, int) /* Get flags */ 66 #define FSSIOCSET50 _IOW('F', 0, struct fss_set50) /* Old configure */ 67 68 #ifdef _KERNEL 69 70 #include <sys/bufq.h> 71 72 #define FSS_CLUSTER_MAX (1<<24) /* Upper bound of clusters. The 73 sc_copied map uses up to 74 FSS_CLUSTER_MAX/NBBY bytes */ 75 76 /* Check if still valid */ 77 #define FSS_ISVALID(sc) \ 78 (((sc)->sc_flags & (FSS_ACTIVE|FSS_ERROR)) == FSS_ACTIVE) 79 80 /* Offset to cluster */ 81 #define FSS_BTOCL(sc, off) \ 82 ((off) >> (sc)->sc_clshift) 83 84 /* Cluster to offset */ 85 #define FSS_CLTOB(sc, cl) \ 86 ((off_t)(cl) << (sc)->sc_clshift) 87 88 /* Offset from start of cluster */ 89 #define FSS_CLOFF(sc, off) \ 90 ((off) & (sc)->sc_clmask) 91 92 /* Size of cluster */ 93 #define FSS_CLSIZE(sc) \ 94 (1 << (sc)->sc_clshift) 95 96 /* Offset to backing store block */ 97 #define FSS_BTOFSB(sc, off) \ 98 ((off) >> (sc)->sc_bs_bshift) 99 100 /* Backing store block to offset */ 101 #define FSS_FSBTOB(sc, blk) \ 102 ((off_t)(blk) << (sc)->sc_bs_bshift) 103 104 /* Offset from start of backing store block */ 105 #define FSS_FSBOFF(sc, off) \ 106 ((off) & (sc)->sc_bs_bmask) 107 108 /* Size of backing store block */ 109 #define FSS_FSBSIZE(sc) \ 110 (1 << (sc)->sc_bs_bshift) 111 112 typedef enum { 113 FSS_READ, 114 FSS_WRITE 115 } fss_io_type; 116 117 typedef enum { 118 FSS_CACHE_FREE = 0, /* Cache entry is free */ 119 FSS_CACHE_BUSY = 1, /* Cache entry is read from device */ 120 FSS_CACHE_VALID = 2 /* Cache entry contains valid data */ 121 } fss_cache_type; 122 123 struct fss_cache { 124 fss_cache_type fc_type; /* Current state */ 125 u_int32_t fc_cluster; /* Cluster number of this entry */ 126 kcondvar_t fc_state_cv; /* Signals state change from busy */ 127 void * fc_data; /* Data */ 128 }; 129 130 struct fss_softc { 131 device_t sc_dev; /* Self */ 132 kmutex_t sc_slock; /* Protect this softc */ 133 kmutex_t sc_lock; /* Sleep lock for fss_ioctl */ 134 kcondvar_t sc_work_cv; /* Signals work for the kernel thread */ 135 kcondvar_t sc_cache_cv; /* Signals free cache slot */ 136 volatile int sc_flags; /* Flags */ 137 #define FSS_ACTIVE 0x01 /* Snapshot is active */ 138 #define FSS_ERROR 0x02 /* I/O error occurred */ 139 #define FSS_BS_THREAD 0x04 /* Kernel thread is running */ 140 #define FSS_PERSISTENT 0x20 /* File system internal snapshot */ 141 #define FSS_CDEV_OPEN 0x40 /* character device open */ 142 #define FSS_BDEV_OPEN 0x80 /* block device open */ 143 int sc_uflags; /* User visible flags */ 144 struct disk *sc_dkdev; /* Generic disk device info */ 145 struct mount *sc_mount; /* Mount point */ 146 char sc_mntname[MNAMELEN]; /* Mount point */ 147 struct timeval sc_time; /* Time this snapshot was taken */ 148 dev_t sc_bdev; /* Underlying block device */ 149 struct vnode *sc_bs_vp; /* Our backing store */ 150 int sc_bs_bshift; /* Shift of backing store block */ 151 u_int32_t sc_bs_bmask; /* Mask of backing store block */ 152 struct lwp *sc_bs_lwp; /* Our kernel thread */ 153 int sc_clshift; /* Shift of cluster size */ 154 u_int32_t sc_clmask; /* Mask of cluster size */ 155 u_int32_t sc_clcount; /* # clusters in file system */ 156 u_int8_t *sc_copied; /* Map of clusters already copied */ 157 long sc_clresid; /* Bytes in last cluster */ 158 int sc_cache_size; /* Number of entries in sc_cache */ 159 struct fss_cache *sc_cache; /* Cluster cache */ 160 struct bufq_state *sc_bufq; /* Transfer queue */ 161 u_int32_t sc_clnext; /* Next free cluster on backing store */ 162 int sc_indir_size; /* # clusters for indirect mapping */ 163 u_int8_t *sc_indir_valid; /* Map of valid indirect clusters */ 164 u_int32_t sc_indir_cur; /* Current indir cluster number */ 165 int sc_indir_dirty; /* Current indir cluster modified */ 166 u_int32_t *sc_indir_data; /* Current indir cluster data */ 167 }; 168 169 #endif /* _KERNEL */ 170 171 #endif /* !_SYS_DEV_FSSVAR_H */ 172
Indexes created Mon Sep 22 13:09:51 GMT 2025