FreeBSD/Linux Kernel Cross Reference
sys/fs/ntfs/runlist.h

     /*
      * runlist.h - Defines for runlist handling in NTFS Linux kernel driver.
      *             Part of the Linux-NTFS project.
      *
      * Copyright (c) 2001-2005 Anton Altaparmakov
      * Copyright (c) 2002 Richard Russon
      *
      * This program/include file is free software; you can redistribute it and/or
      * modify it under the terms of the GNU General Public License as published
     * by the Free Software Foundation; either version 2 of the License, or
     * (at your option) any later version.
     *
     * This program/include file is distributed in the hope that it will be
     * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
     * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     * GNU General Public License for more details.
     *
     * You should have received a copy of the GNU General Public License
     * along with this program (in the main directory of the Linux-NTFS
     * distribution in the file COPYING); if not, write to the Free Software
     * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
     */
    
    #ifndef _LINUX_NTFS_RUNLIST_H
    #define _LINUX_NTFS_RUNLIST_H
    
    #include "types.h"
    #include "layout.h"
    #include "volume.h"
    
    /**
     * runlist_element - in memory vcn to lcn mapping array element
     * @vcn:        starting vcn of the current array element
     * @lcn:        starting lcn of the current array element
     * @length:     length in clusters of the current array element
     *
     * The last vcn (in fact the last vcn + 1) is reached when length == 0.
     *
     * When lcn == -1 this means that the count vcns starting at vcn are not
     * physically allocated (i.e. this is a hole / data is sparse).
     */
    typedef struct {        /* In memory vcn to lcn mapping structure element. */
            VCN vcn;        /* vcn = Starting virtual cluster number. */
            LCN lcn;        /* lcn = Starting logical cluster number. */
            s64 length;     /* Run length in clusters. */
    } runlist_element;
    
    /**
     * runlist - in memory vcn to lcn mapping array including a read/write lock
     * @rl:         pointer to an array of runlist elements
     * @lock:       read/write spinlock for serializing access to @rl
     *
     */
    typedef struct {
            runlist_element *rl;
            struct rw_semaphore lock;
    } runlist;
    
    static inline void ntfs_init_runlist(runlist *rl)
    {
            rl->rl = NULL;
            init_rwsem(&rl->lock);
    }
    
    typedef enum {
            LCN_HOLE                = -1,   /* Keep this as highest value or die! */
            LCN_RL_NOT_MAPPED       = -2,
            LCN_ENOENT              = -3,
            LCN_ENOMEM              = -4,
            LCN_EIO                 = -5,
    } LCN_SPECIAL_VALUES;
    
    extern runlist_element *ntfs_runlists_merge(runlist_element *drl,
                    runlist_element *srl);
    
    extern runlist_element *ntfs_mapping_pairs_decompress(const ntfs_volume *vol,
                    const ATTR_RECORD *attr, runlist_element *old_rl);
    
    extern LCN ntfs_rl_vcn_to_lcn(const runlist_element *rl, const VCN vcn);
    
    #ifdef NTFS_RW
    
    extern runlist_element *ntfs_rl_find_vcn_nolock(runlist_element *rl,
                    const VCN vcn);
    
    extern int ntfs_get_size_for_mapping_pairs(const ntfs_volume *vol,
                    const runlist_element *rl, const VCN first_vcn,
                    const VCN last_vcn);
    
    extern int ntfs_mapping_pairs_build(const ntfs_volume *vol, s8 *dst,
                    const int dst_len, const runlist_element *rl,
                    const VCN first_vcn, const VCN last_vcn, VCN *const stop_vcn);
    
    extern int ntfs_rl_truncate_nolock(const ntfs_volume *vol,
                    runlist *const runlist, const s64 new_length);
    
    int ntfs_rl_punch_nolock(const ntfs_volume *vol, runlist *const runlist,
                    const VCN start, const s64 length);
    
   #endif /* NTFS_RW */
   
   #endif /* _LINUX_NTFS_RUNLIST_H */

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