The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/fssvar.h

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    1 /*      $NetBSD: fssvar.h,v 1.5 2004/02/24 15:12:51 wiz 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         struct mount    *sc_mount;      /* Mount point */
  148         char            sc_mntname[MNAMELEN]; /* Mount point */
  149         struct timeval  sc_time;        /* Time this snapshot was taken */
  150         dev_t           sc_bdev;        /* Underlying block device */
  151         struct vnode    *sc_mount_vp;   /* Underlying spec vnode */
  152         struct vnode    *sc_bs_vp;      /* Our backing store */
  153         off_t           sc_bs_size;     /* Its size in bytes */
  154         int             sc_bs_bshift;   /* Shift of backing store block */
  155         u_int32_t       sc_bs_bmask;    /* Mask of backing store block */
  156         struct proc     *sc_bs_proc;    /* Our kernel thread */
  157         int             sc_clshift;     /* Shift of cluster size */
  158         u_int32_t       sc_clmask;      /* Mask of cluster size */
  159         u_int32_t       sc_clcount;     /* # clusters in file system */
  160         u_int8_t        *sc_copied;     /* Map of clusters already copied */
  161         long            sc_clresid;     /* Bytes in last cluster */
  162         int             sc_cache_size;  /* Number of entries in sc_cache */
  163         struct fss_cache *sc_cache;     /* Cluster cache */
  164         struct bufq_state sc_bufq;      /* Transfer queue */
  165         u_int32_t       sc_clnext;      /* Next free cluster on backing store */
  166         int             sc_indir_size;  /* # clusters for indirect mapping */
  167         u_int8_t        *sc_indir_valid; /* Map of valid indirect clusters */
  168         u_int32_t       sc_indir_cur;   /* Current indir cluster number */
  169         int             sc_indir_dirty; /* Current indir cluster modified */
  170         u_int32_t       *sc_indir_data; /* Current indir cluster data */
  171 };
  172 
  173 int fss_umount_hook(struct mount *, int);
  174 
  175 #endif /* _KERNEL */
  176 
  177 #endif /* !_SYS_DEV_FSSVAR_H */

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