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 1.23 2008/09/17 14:49:25 hannken 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 
   39 struct fss_set {
   40         char            *fss_mount;     /* Mount point of file system */
   41         char            *fss_bstore;    /* Path of backing store */
   42         blksize_t       fss_csize;      /* Preferred cluster size */
   43 };
   44 
   45 struct fss_get {
   46         char            fsg_mount[MNAMELEN]; /* Mount point of file system */
   47         struct timeval  fsg_time;       /* Time this snapshot was taken */
   48         blksize_t       fsg_csize;      /* Current cluster size */
   49         blkcnt_t        fsg_mount_size; /* # clusters on file system */
   50         blkcnt_t        fsg_bs_size;    /* # clusters on backing store */
   51 };
   52 
   53 #define FSSIOCSET       _IOW('F', 0, struct fss_set)    /* Configure */
   54 #define FSSIOCGET       _IOR('F', 1, struct fss_get)    /* Status */
   55 #define FSSIOCCLR       _IO('F', 2)                     /* Unconfigure */
   56 #define FSSIOFSET       _IOW('F', 3, int)               /* Set flags */
   57 #define FSSIOFGET       _IOR('F', 4, int)               /* Get flags */
   58 
   59 #ifdef _KERNEL
   60 
   61 #include <sys/bufq.h>
   62 
   63 #define FSS_CLUSTER_MAX (1<<24)         /* Upper bound of clusters. The
   64                                            sc_copied map uses up to
   65                                            FSS_CLUSTER_MAX/NBBY bytes */
   66 
   67 /* Check if still valid */
   68 #define FSS_ISVALID(sc) \
   69         (((sc)->sc_flags & (FSS_ACTIVE|FSS_ERROR)) == FSS_ACTIVE)
   70 
   71 /* Offset to cluster */
   72 #define FSS_BTOCL(sc, off) \
   73         ((off) >> (sc)->sc_clshift)
   74 
   75 /* Cluster to offset */
   76 #define FSS_CLTOB(sc, cl) \
   77         ((off_t)(cl) << (sc)->sc_clshift)
   78 
   79 /* Offset from start of cluster */
   80 #define FSS_CLOFF(sc, off) \
   81         ((off) & (sc)->sc_clmask)
   82 
   83 /* Size of cluster */
   84 #define FSS_CLSIZE(sc) \
   85         (1 << (sc)->sc_clshift)
   86 
   87 /* Offset to backing store block */
   88 #define FSS_BTOFSB(sc, off) \
   89         ((off) >> (sc)->sc_bs_bshift)
   90 
   91 /* Backing store block to offset */
   92 #define FSS_FSBTOB(sc, blk) \
   93         ((off_t)(blk) << (sc)->sc_bs_bshift)
   94 
   95 /* Offset from start of backing store block */
   96 #define FSS_FSBOFF(sc, off) \
   97         ((off) & (sc)->sc_bs_bmask)
   98 
   99 /* Size of backing store block */
  100 #define FSS_FSBSIZE(sc) \
  101         (1 << (sc)->sc_bs_bshift)
  102 
  103 typedef enum {
  104         FSS_READ,
  105         FSS_WRITE
  106 } fss_io_type;
  107 
  108 typedef enum {
  109         FSS_CACHE_FREE  = 0,            /* Cache entry is free */
  110         FSS_CACHE_BUSY  = 1,            /* Cache entry is read from device */
  111         FSS_CACHE_VALID = 2             /* Cache entry contains valid data */
  112 } fss_cache_type;
  113 
  114 struct fss_cache {
  115         fss_cache_type  fc_type;        /* Current state */
  116         u_int32_t       fc_cluster;     /* Cluster number of this entry */
  117         kcondvar_t      fc_state_cv;    /* Signals state change from busy */
  118         void *          fc_data;        /* Data */
  119 };
  120 
  121 struct fss_softc {
  122         device_t        sc_dev;         /* Self */
  123         kmutex_t        sc_slock;       /* Protect this softc */
  124         kmutex_t        sc_lock;        /* Sleep lock for fss_ioctl */
  125         kcondvar_t      sc_work_cv;     /* Signals work for the kernel thread */
  126         kcondvar_t      sc_cache_cv;    /* Signals free cache slot */
  127         volatile int    sc_flags;       /* Flags */
  128 #define FSS_ACTIVE      0x01            /* Snapshot is active */
  129 #define FSS_ERROR       0x02            /* I/O error occurred */
  130 #define FSS_BS_THREAD   0x04            /* Kernel thread is running */
  131 #define FSS_PERSISTENT  0x20            /* File system internal snapshot */
  132 #define FSS_CDEV_OPEN   0x40            /* character device open */
  133 #define FSS_BDEV_OPEN   0x80            /* block device open */
  134         int             sc_uflags;      /* User visible flags */
  135         struct disk     *sc_dkdev;      /* Generic disk device info */
  136         struct mount    *sc_mount;      /* Mount point */
  137         char            sc_mntname[MNAMELEN]; /* Mount point */
  138         struct timeval  sc_time;        /* Time this snapshot was taken */
  139         dev_t           sc_bdev;        /* Underlying block device */
  140         struct vnode    *sc_bs_vp;      /* Our backing store */
  141         off_t           sc_bs_size;     /* Its size in bytes */
  142         int             sc_bs_bshift;   /* Shift of backing store block */
  143         u_int32_t       sc_bs_bmask;    /* Mask of backing store block */
  144         struct lwp      *sc_bs_lwp;     /* Our kernel thread */
  145         int             sc_clshift;     /* Shift of cluster size */
  146         u_int32_t       sc_clmask;      /* Mask of cluster size */
  147         u_int32_t       sc_clcount;     /* # clusters in file system */
  148         u_int8_t        *sc_copied;     /* Map of clusters already copied */
  149         long            sc_clresid;     /* Bytes in last cluster */
  150         int             sc_cache_size;  /* Number of entries in sc_cache */
  151         struct fss_cache *sc_cache;     /* Cluster cache */
  152         struct bufq_state *sc_bufq;     /* Transfer queue */
  153         u_int32_t       sc_clnext;      /* Next free cluster on backing store */
  154         int             sc_indir_size;  /* # clusters for indirect mapping */
  155         u_int8_t        *sc_indir_valid; /* Map of valid indirect clusters */
  156         u_int32_t       sc_indir_cur;   /* Current indir cluster number */
  157         int             sc_indir_dirty; /* Current indir cluster modified */
  158         u_int32_t       *sc_indir_data; /* Current indir cluster data */
  159 };
  160 
  161 #endif /* _KERNEL */
  162 
  163 #endif /* !_SYS_DEV_FSSVAR_H */

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