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7
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1 /* vi:set ts=8 sts=4 sw=4:
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2 *
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3 * VIM - Vi IMproved by Bram Moolenaar
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4 *
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5 * Do ":help uganda" in Vim to read copying and usage conditions.
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6 * Do ":help credits" in Vim to see a list of people who contributed.
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7 * See README.txt for an overview of the Vim source code.
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8 */
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9
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10 /*
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11 * memfile.c: Contains the functions for handling blocks of memory which can
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12 * be stored in a file. This is the implementation of a sort of virtual memory.
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13 *
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14 * A memfile consists of a sequence of blocks. The blocks numbered from 0
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15 * upwards have been assigned a place in the actual file. The block number
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16 * is equal to the page number in the file. The
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17 * blocks with negative numbers are currently in memory only. They can be
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18 * assigned a place in the file when too much memory is being used. At that
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19 * moment they get a new, positive, number. A list is used for translation of
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20 * negative to positive numbers.
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21 *
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22 * The size of a block is a multiple of a page size, normally the page size of
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23 * the device the file is on. Most blocks are 1 page long. A Block of multiple
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24 * pages is used for a line that does not fit in a single page.
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25 *
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26 * Each block can be in memory and/or in a file. The block stays in memory
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27 * as long as it is locked. If it is no longer locked it can be swapped out to
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28 * the file. It is only written to the file if it has been changed.
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29 *
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30 * Under normal operation the file is created when opening the memory file and
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31 * deleted when closing the memory file. Only with recovery an existing memory
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32 * file is opened.
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33 */
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34
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1668
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35 #if defined(MSDOS) || defined(WIN16) || defined(WIN32) || defined(_WIN64)
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714
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36 # include "vimio.h" /* for lseek(), must be before vim.h */
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7
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37 #endif
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38
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39 #include "vim.h"
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40
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41 /*
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42 * Some systems have the page size in statfs.f_bsize, some in stat.st_blksize
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43 */
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44 #ifdef HAVE_ST_BLKSIZE
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45 # define STATFS stat
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46 # define F_BSIZE st_blksize
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47 # define fstatfs(fd, buf, len, nul) mch_fstat((fd), (buf))
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48 #else
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49 # ifdef HAVE_SYS_STATFS_H
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50 # include <sys/statfs.h>
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51 # define STATFS statfs
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52 # define F_BSIZE f_bsize
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53 # ifdef __MINT__ /* do we still need this? */
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54 # define fstatfs(fd, buf, len, nul) mch_fstat((fd), (buf))
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55 # endif
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56 # endif
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57 #endif
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58
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59 /*
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60 * for Amiga Dos 2.0x we use Flush
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61 */
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62 #ifdef AMIGA
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63 # ifdef FEAT_ARP
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64 extern int dos2; /* this is in os_amiga.c */
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65 # endif
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66 # ifdef SASC
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67 # include <proto/dos.h>
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68 # include <ios1.h> /* for chkufb() */
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69 # endif
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70 #endif
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71
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72 #define MEMFILE_PAGE_SIZE 4096 /* default page size */
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73
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74 static long_u total_mem_used = 0; /* total memory used for memfiles */
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75
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76 static void mf_ins_hash __ARGS((memfile_T *, bhdr_T *));
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77 static void mf_rem_hash __ARGS((memfile_T *, bhdr_T *));
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78 static bhdr_T *mf_find_hash __ARGS((memfile_T *, blocknr_T));
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79 static void mf_ins_used __ARGS((memfile_T *, bhdr_T *));
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80 static void mf_rem_used __ARGS((memfile_T *, bhdr_T *));
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81 static bhdr_T *mf_release __ARGS((memfile_T *, int));
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82 static bhdr_T *mf_alloc_bhdr __ARGS((memfile_T *, int));
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83 static void mf_free_bhdr __ARGS((bhdr_T *));
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84 static void mf_ins_free __ARGS((memfile_T *, bhdr_T *));
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85 static bhdr_T *mf_rem_free __ARGS((memfile_T *));
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86 static int mf_read __ARGS((memfile_T *, bhdr_T *));
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87 static int mf_write __ARGS((memfile_T *, bhdr_T *));
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88 static int mf_trans_add __ARGS((memfile_T *, bhdr_T *));
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89 static void mf_do_open __ARGS((memfile_T *, char_u *, int));
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90
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91 /*
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92 * The functions for using a memfile:
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93 *
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94 * mf_open() open a new or existing memfile
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95 * mf_open_file() open a swap file for an existing memfile
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96 * mf_close() close (and delete) a memfile
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97 * mf_new() create a new block in a memfile and lock it
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98 * mf_get() get an existing block and lock it
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99 * mf_put() unlock a block, may be marked for writing
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100 * mf_free() remove a block
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101 * mf_sync() sync changed parts of memfile to disk
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102 * mf_release_all() release as much memory as possible
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103 * mf_trans_del() may translate negative to positive block number
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104 * mf_fullname() make file name full path (use before first :cd)
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105 */
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106
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107 /*
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108 * Open an existing or new memory block file.
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109 *
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110 * fname: name of file to use (NULL means no file at all)
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111 * Note: fname must have been allocated, it is not copied!
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112 * If opening the file fails, fname is freed.
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113 * flags: flags for open() call
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114 *
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115 * If fname != NULL and file cannot be opened, fail.
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116 *
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117 * return value: identifier for this memory block file.
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118 */
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119 memfile_T *
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120 mf_open(fname, flags)
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121 char_u *fname;
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122 int flags;
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123 {
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124 memfile_T *mfp;
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125 int i;
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126 off_t size;
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127 #if defined(STATFS) && defined(UNIX) && !defined(__QNX__)
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128 # define USE_FSTATFS
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129 struct STATFS stf;
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130 #endif
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131
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132 if ((mfp = (memfile_T *)alloc((unsigned)sizeof(memfile_T))) == NULL)
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133 return NULL;
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134
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135 if (fname == NULL) /* no file for this memfile, use memory only */
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136 {
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137 mfp->mf_fname = NULL;
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138 mfp->mf_ffname = NULL;
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139 mfp->mf_fd = -1;
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140 }
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141 else
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142 {
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143 mf_do_open(mfp, fname, flags); /* try to open the file */
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144
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145 /* if the file cannot be opened, return here */
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146 if (mfp->mf_fd < 0)
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147 {
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148 vim_free(mfp);
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149 return NULL;
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150 }
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151 }
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152
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153 mfp->mf_free_first = NULL; /* free list is empty */
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154 mfp->mf_used_first = NULL; /* used list is empty */
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155 mfp->mf_used_last = NULL;
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156 mfp->mf_dirty = FALSE;
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157 mfp->mf_used_count = 0;
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158 for (i = 0; i < MEMHASHSIZE; ++i)
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159 {
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160 mfp->mf_hash[i] = NULL; /* hash lists are empty */
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161 mfp->mf_trans[i] = NULL; /* trans lists are empty */
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162 }
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163 mfp->mf_page_size = MEMFILE_PAGE_SIZE;
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164
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165 #ifdef USE_FSTATFS
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166 /*
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167 * Try to set the page size equal to the block size of the device.
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168 * Speeds up I/O a lot.
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169 * When recovering, the actual block size will be retrieved from block 0
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170 * in ml_recover(). The size used here may be wrong, therefore
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171 * mf_blocknr_max must be rounded up.
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172 */
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173 if (mfp->mf_fd >= 0
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174 && fstatfs(mfp->mf_fd, &stf, sizeof(struct statfs), 0) == 0
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175 && stf.F_BSIZE >= MIN_SWAP_PAGE_SIZE
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176 && stf.F_BSIZE <= MAX_SWAP_PAGE_SIZE)
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177 mfp->mf_page_size = stf.F_BSIZE;
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178 #endif
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179
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180 if (mfp->mf_fd < 0 || (flags & (O_TRUNC|O_EXCL))
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181 || (size = lseek(mfp->mf_fd, (off_t)0L, SEEK_END)) <= 0)
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182 mfp->mf_blocknr_max = 0; /* no file or empty file */
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183 else
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184 mfp->mf_blocknr_max = (blocknr_T)((size + mfp->mf_page_size - 1)
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185 / mfp->mf_page_size);
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186 mfp->mf_blocknr_min = -1;
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187 mfp->mf_neg_count = 0;
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188 mfp->mf_infile_count = mfp->mf_blocknr_max;
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1230
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189
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190 /*
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191 * Compute maximum number of pages ('maxmem' is in Kbyte):
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192 * 'mammem' * 1Kbyte / page-size-in-bytes.
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193 * Avoid overflow by first reducing page size as much as possible.
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194 */
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195 {
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196 int shift = 10;
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197 unsigned page_size = mfp->mf_page_size;
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198
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199 while (shift > 0 && (page_size & 1) == 0)
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200 {
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201 page_size = page_size >> 1;
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202 --shift;
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203 }
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204 mfp->mf_used_count_max = (p_mm << shift) / page_size;
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205 if (mfp->mf_used_count_max < 10)
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206 mfp->mf_used_count_max = 10;
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207 }
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7
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208
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209 return mfp;
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210 }
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211
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212 /*
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213 * Open a file for an existing memfile. Used when updatecount set from 0 to
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214 * some value.
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215 * If the file already exists, this fails.
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216 * "fname" is the name of file to use (NULL means no file at all)
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217 * Note: "fname" must have been allocated, it is not copied! If opening the
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218 * file fails, "fname" is freed.
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219 *
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220 * return value: FAIL if file could not be opened, OK otherwise
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221 */
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222 int
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223 mf_open_file(mfp, fname)
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224 memfile_T *mfp;
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225 char_u *fname;
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226 {
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227 mf_do_open(mfp, fname, O_RDWR|O_CREAT|O_EXCL); /* try to open the file */
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228
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229 if (mfp->mf_fd < 0)
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230 return FAIL;
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231
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232 mfp->mf_dirty = TRUE;
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233 return OK;
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234 }
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235
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236 /*
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237 * close a memory file and delete the associated file if 'del_file' is TRUE
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238 */
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239 void
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240 mf_close(mfp, del_file)
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241 memfile_T *mfp;
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242 int del_file;
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243 {
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244 bhdr_T *hp, *nextp;
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245 NR_TRANS *tp, *tpnext;
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246 int i;
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247
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248 if (mfp == NULL) /* safety check */
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249 return;
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250 if (mfp->mf_fd >= 0)
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251 {
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252 if (close(mfp->mf_fd) < 0)
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253 EMSG(_(e_swapclose));
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254 }
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255 if (del_file && mfp->mf_fname != NULL)
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256 mch_remove(mfp->mf_fname);
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257 /* free entries in used list */
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258 for (hp = mfp->mf_used_first; hp != NULL; hp = nextp)
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259 {
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260 total_mem_used -= hp->bh_page_count * mfp->mf_page_size;
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261 nextp = hp->bh_next;
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262 mf_free_bhdr(hp);
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263 }
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264 while (mfp->mf_free_first != NULL) /* free entries in free list */
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265 vim_free(mf_rem_free(mfp));
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266 for (i = 0; i < MEMHASHSIZE; ++i) /* free entries in trans lists */
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267 for (tp = mfp->mf_trans[i]; tp != NULL; tp = tpnext)
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268 {
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269 tpnext = tp->nt_next;
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270 vim_free(tp);
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271 }
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272 vim_free(mfp->mf_fname);
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273 vim_free(mfp->mf_ffname);
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274 vim_free(mfp);
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275 }
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276
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277 /*
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278 * Close the swap file for a memfile. Used when 'swapfile' is reset.
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279 */
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280 void
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281 mf_close_file(buf, getlines)
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282 buf_T *buf;
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283 int getlines; /* get all lines into memory? */
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284 {
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285 memfile_T *mfp;
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286 linenr_T lnum;
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287
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288 mfp = buf->b_ml.ml_mfp;
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289 if (mfp == NULL || mfp->mf_fd < 0) /* nothing to close */
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290 return;
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291
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292 if (getlines)
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293 {
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294 /* get all blocks in memory by accessing all lines (clumsy!) */
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1066
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295 mf_dont_release = TRUE;
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7
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296 for (lnum = 1; lnum <= buf->b_ml.ml_line_count; ++lnum)
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297 (void)ml_get_buf(buf, lnum, FALSE);
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1066
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298 mf_dont_release = FALSE;
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7
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299 /* TODO: should check if all blocks are really in core */
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300 }
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301
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302 if (close(mfp->mf_fd) < 0) /* close the file */
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303 EMSG(_(e_swapclose));
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304 mfp->mf_fd = -1;
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305
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306 if (mfp->mf_fname != NULL)
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307 {
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308 mch_remove(mfp->mf_fname); /* delete the swap file */
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309 vim_free(mfp->mf_fname);
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310 vim_free(mfp->mf_ffname);
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311 mfp->mf_fname = NULL;
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312 mfp->mf_ffname = NULL;
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313 }
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314 }
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315
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316 /*
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317 * Set new size for a memfile. Used when block 0 of a swapfile has been read
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318 * and the size it indicates differs from what was guessed.
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319 */
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320 void
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321 mf_new_page_size(mfp, new_size)
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322 memfile_T *mfp;
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323 unsigned new_size;
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324 {
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325 /* Correct the memory used for block 0 to the new size, because it will be
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326 * freed with that size later on. */
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327 total_mem_used += new_size - mfp->mf_page_size;
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328 mfp->mf_page_size = new_size;
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329 }
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330
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331 /*
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332 * get a new block
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333 *
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334 * negative: TRUE if negative block number desired (data block)
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335 */
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336 bhdr_T *
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337 mf_new(mfp, negative, page_count)
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338 memfile_T *mfp;
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339 int negative;
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340 int page_count;
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341 {
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1166
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342 bhdr_T *hp; /* new bhdr_T */
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343 bhdr_T *freep; /* first block in free list */
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344 char_u *p;
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7
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345
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346 /*
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347 * If we reached the maximum size for the used memory blocks, release one
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348 * If a bhdr_T is returned, use it and adjust the page_count if necessary.
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349 */
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350 hp = mf_release(mfp, page_count);
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351
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352 /*
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353 * Decide on the number to use:
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354 * If there is a free block, use its number.
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355 * Otherwise use mf_block_min for a negative number, mf_block_max for
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356 * a positive number.
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357 */
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358 freep = mfp->mf_free_first;
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359 if (!negative && freep != NULL && freep->bh_page_count >= page_count)
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360 {
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361 /*
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362 * If the block in the free list has more pages, take only the number
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363 * of pages needed and allocate a new bhdr_T with data
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364 *
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1166
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365 * If the number of pages matches and mf_release() did not return a
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366 * bhdr_T, use the bhdr_T from the free list and allocate the data
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7
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367 *
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1166
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368 * If the number of pages matches and mf_release() returned a bhdr_T,
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7
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369 * just use the number and free the bhdr_T from the free list
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370 */
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371 if (freep->bh_page_count > page_count)
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372 {
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373 if (hp == NULL && (hp = mf_alloc_bhdr(mfp, page_count)) == NULL)
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374 return NULL;
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375 hp->bh_bnum = freep->bh_bnum;
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376 freep->bh_bnum += page_count;
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377 freep->bh_page_count -= page_count;
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378 }
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379 else if (hp == NULL) /* need to allocate memory for this block */
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380 {
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|
|
381 if ((p = (char_u *)alloc(mfp->mf_page_size * page_count)) == NULL)
|
|
|
382 return NULL;
|
|
|
383 hp = mf_rem_free(mfp);
|
|
|
384 hp->bh_data = p;
|
|
|
385 }
|
|
|
386 else /* use the number, remove entry from free list */
|
|
|
387 {
|
|
|
388 freep = mf_rem_free(mfp);
|
|
|
389 hp->bh_bnum = freep->bh_bnum;
|
|
|
390 vim_free(freep);
|
|
|
391 }
|
|
|
392 }
|
|
|
393 else /* get a new number */
|
|
|
394 {
|
|
|
395 if (hp == NULL && (hp = mf_alloc_bhdr(mfp, page_count)) == NULL)
|
|
|
396 return NULL;
|
|
|
397 if (negative)
|
|
|
398 {
|
|
|
399 hp->bh_bnum = mfp->mf_blocknr_min--;
|
|
|
400 mfp->mf_neg_count++;
|
|
|
401 }
|
|
|
402 else
|
|
|
403 {
|
|
|
404 hp->bh_bnum = mfp->mf_blocknr_max;
|
|
|
405 mfp->mf_blocknr_max += page_count;
|
|
|
406 }
|
|
|
407 }
|
|
|
408 hp->bh_flags = BH_LOCKED | BH_DIRTY; /* new block is always dirty */
|
|
|
409 mfp->mf_dirty = TRUE;
|
|
|
410 hp->bh_page_count = page_count;
|
|
|
411 mf_ins_used(mfp, hp);
|
|
|
412 mf_ins_hash(mfp, hp);
|
|
|
413
|
|
|
414 /*
|
|
|
415 * Init the data to all zero, to avoid reading uninitialized data.
|
|
|
416 * This also avoids that the passwd file ends up in the swap file!
|
|
|
417 */
|
|
|
418 (void)vim_memset((char *)(hp->bh_data), 0, (size_t)mfp->mf_page_size);
|
|
|
419
|
|
|
420 return hp;
|
|
|
421 }
|
|
|
422
|
|
|
423 /*
|
|
|
424 * get existing block 'nr' with 'page_count' pages
|
|
|
425 *
|
|
|
426 * Note: The caller should first check a negative nr with mf_trans_del()
|
|
|
427 */
|
|
|
428 bhdr_T *
|
|
|
429 mf_get(mfp, nr, page_count)
|
|
|
430 memfile_T *mfp;
|
|
|
431 blocknr_T nr;
|
|
|
432 int page_count;
|
|
|
433 {
|
|
|
434 bhdr_T *hp;
|
|
|
435 /* doesn't exist */
|
|
|
436 if (nr >= mfp->mf_blocknr_max || nr <= mfp->mf_blocknr_min)
|
|
|
437 return NULL;
|
|
|
438
|
|
|
439 /*
|
|
|
440 * see if it is in the cache
|
|
|
441 */
|
|
|
442 hp = mf_find_hash(mfp, nr);
|
|
|
443 if (hp == NULL) /* not in the hash list */
|
|
|
444 {
|
|
|
445 if (nr < 0 || nr >= mfp->mf_infile_count) /* can't be in the file */
|
|
|
446 return NULL;
|
|
|
447
|
|
|
448 /* could check here if the block is in the free list */
|
|
|
449
|
|
|
450 /*
|
|
|
451 * Check if we need to flush an existing block.
|
|
|
452 * If so, use that block.
|
|
|
453 * If not, allocate a new block.
|
|
|
454 */
|
|
|
455 hp = mf_release(mfp, page_count);
|
|
|
456 if (hp == NULL && (hp = mf_alloc_bhdr(mfp, page_count)) == NULL)
|
|
|
457 return NULL;
|
|
|
458
|
|
|
459 hp->bh_bnum = nr;
|
|
|
460 hp->bh_flags = 0;
|
|
|
461 hp->bh_page_count = page_count;
|
|
|
462 if (mf_read(mfp, hp) == FAIL) /* cannot read the block! */
|
|
|
463 {
|
|
|
464 mf_free_bhdr(hp);
|
|
|
465 return NULL;
|
|
|
466 }
|
|
|
467 }
|
|
|
468 else
|
|
|
469 {
|
|
|
470 mf_rem_used(mfp, hp); /* remove from list, insert in front below */
|
|
|
471 mf_rem_hash(mfp, hp);
|
|
|
472 }
|
|
|
473
|
|
|
474 hp->bh_flags |= BH_LOCKED;
|
|
|
475 mf_ins_used(mfp, hp); /* put in front of used list */
|
|
|
476 mf_ins_hash(mfp, hp); /* put in front of hash list */
|
|
|
477
|
|
|
478 return hp;
|
|
|
479 }
|
|
|
480
|
|
|
481 /*
|
|
|
482 * release the block *hp
|
|
|
483 *
|
|
|
484 * dirty: Block must be written to file later
|
|
|
485 * infile: Block should be in file (needed for recovery)
|
|
|
486 *
|
|
|
487 * no return value, function cannot fail
|
|
|
488 */
|
|
|
489 void
|
|
|
490 mf_put(mfp, hp, dirty, infile)
|
|
|
491 memfile_T *mfp;
|
|
|
492 bhdr_T *hp;
|
|
|
493 int dirty;
|
|
|
494 int infile;
|
|
|
495 {
|
|
|
496 int flags;
|
|
|
497
|
|
|
498 flags = hp->bh_flags;
|
|
|
499
|
|
|
500 if ((flags & BH_LOCKED) == 0)
|
|
|
501 EMSG(_("E293: block was not locked"));
|
|
|
502 flags &= ~BH_LOCKED;
|
|
|
503 if (dirty)
|
|
|
504 {
|
|
|
505 flags |= BH_DIRTY;
|
|
|
506 mfp->mf_dirty = TRUE;
|
|
|
507 }
|
|
|
508 hp->bh_flags = flags;
|
|
|
509 if (infile)
|
|
|
510 mf_trans_add(mfp, hp); /* may translate negative in positive nr */
|
|
|
511 }
|
|
|
512
|
|
|
513 /*
|
|
|
514 * block *hp is no longer in used, may put it in the free list of memfile *mfp
|
|
|
515 */
|
|
|
516 void
|
|
|
517 mf_free(mfp, hp)
|
|
|
518 memfile_T *mfp;
|
|
|
519 bhdr_T *hp;
|
|
|
520 {
|
|
|
521 vim_free(hp->bh_data); /* free the memory */
|
|
|
522 mf_rem_hash(mfp, hp); /* get *hp out of the hash list */
|
|
|
523 mf_rem_used(mfp, hp); /* get *hp out of the used list */
|
|
|
524 if (hp->bh_bnum < 0)
|
|
|
525 {
|
|
|
526 vim_free(hp); /* don't want negative numbers in free list */
|
|
|
527 mfp->mf_neg_count--;
|
|
|
528 }
|
|
|
529 else
|
|
|
530 mf_ins_free(mfp, hp); /* put *hp in the free list */
|
|
|
531 }
|
|
|
532
|
|
984
|
533 #if defined(__MORPHOS__) && defined(__libnix__)
|
|
7
|
534 /* function is missing in MorphOS libnix version */
|
|
|
535 extern unsigned long *__stdfiledes;
|
|
|
536
|
|
|
537 static unsigned long
|
|
|
538 fdtofh(int filedescriptor)
|
|
|
539 {
|
|
|
540 return __stdfiledes[filedescriptor];
|
|
|
541 }
|
|
|
542 #endif
|
|
|
543
|
|
|
544 /*
|
|
|
545 * Sync the memory file *mfp to disk.
|
|
|
546 * Flags:
|
|
|
547 * MFS_ALL If not given, blocks with negative numbers are not synced,
|
|
|
548 * even when they are dirty!
|
|
|
549 * MFS_STOP Stop syncing when a character becomes available, but sync at
|
|
|
550 * least one block.
|
|
|
551 * MFS_FLUSH Make sure buffers are flushed to disk, so they will survive a
|
|
|
552 * system crash.
|
|
|
553 * MFS_ZERO Only write block 0.
|
|
|
554 *
|
|
|
555 * Return FAIL for failure, OK otherwise
|
|
|
556 */
|
|
|
557 int
|
|
|
558 mf_sync(mfp, flags)
|
|
|
559 memfile_T *mfp;
|
|
|
560 int flags;
|
|
|
561 {
|
|
|
562 int status;
|
|
|
563 bhdr_T *hp;
|
|
|
564 #if defined(SYNC_DUP_CLOSE) && !defined(MSDOS)
|
|
|
565 int fd;
|
|
|
566 #endif
|
|
|
567 int got_int_save = got_int;
|
|
|
568
|
|
|
569 if (mfp->mf_fd < 0) /* there is no file, nothing to do */
|
|
|
570 {
|
|
|
571 mfp->mf_dirty = FALSE;
|
|
|
572 return FAIL;
|
|
|
573 }
|
|
|
574
|
|
|
575 /* Only a CTRL-C while writing will break us here, not one typed
|
|
|
576 * previously. */
|
|
|
577 got_int = FALSE;
|
|
|
578
|
|
|
579 /*
|
|
|
580 * sync from last to first (may reduce the probability of an inconsistent
|
|
|
581 * file) If a write fails, it is very likely caused by a full filesystem.
|
|
|
582 * Then we only try to write blocks within the existing file. If that also
|
|
|
583 * fails then we give up.
|
|
|
584 */
|
|
|
585 status = OK;
|
|
|
586 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev)
|
|
|
587 if (((flags & MFS_ALL) || hp->bh_bnum >= 0)
|
|
|
588 && (hp->bh_flags & BH_DIRTY)
|
|
|
589 && (status == OK || (hp->bh_bnum >= 0
|
|
|
590 && hp->bh_bnum < mfp->mf_infile_count)))
|
|
|
591 {
|
|
|
592 if ((flags & MFS_ZERO) && hp->bh_bnum != 0)
|
|
|
593 continue;
|
|
|
594 if (mf_write(mfp, hp) == FAIL)
|
|
|
595 {
|
|
|
596 if (status == FAIL) /* double error: quit syncing */
|
|
|
597 break;
|
|
|
598 status = FAIL;
|
|
|
599 }
|
|
|
600 if (flags & MFS_STOP)
|
|
|
601 {
|
|
|
602 /* Stop when char available now. */
|
|
|
603 if (ui_char_avail())
|
|
|
604 break;
|
|
|
605 }
|
|
|
606 else
|
|
|
607 ui_breakcheck();
|
|
|
608 if (got_int)
|
|
|
609 break;
|
|
|
610 }
|
|
|
611
|
|
|
612 /*
|
|
|
613 * If the whole list is flushed, the memfile is not dirty anymore.
|
|
|
614 * In case of an error this flag is also set, to avoid trying all the time.
|
|
|
615 */
|
|
|
616 if (hp == NULL || status == FAIL)
|
|
|
617 mfp->mf_dirty = FALSE;
|
|
|
618
|
|
|
619 if ((flags & MFS_FLUSH) && *p_sws != NUL)
|
|
|
620 {
|
|
|
621 #if defined(UNIX)
|
|
|
622 # ifdef HAVE_FSYNC
|
|
|
623 /*
|
|
|
624 * most Unixes have the very useful fsync() function, just what we need.
|
|
|
625 * However, with OS/2 and EMX it is also available, but there are
|
|
|
626 * reports of bad problems with it (a bug in HPFS.IFS).
|
|
|
627 * So we disable use of it here in case someone tries to be smart
|
|
|
628 * and changes os_os2_cfg.h... (even though there is no __EMX__ test
|
|
|
629 * in the #if, as __EMX__ does not have sync(); we hope for a timely
|
|
|
630 * sync from the system itself).
|
|
|
631 */
|
|
|
632 # if defined(__EMX__)
|
|
|
633 error "Dont use fsync with EMX! Read emxdoc.doc or emxfix01.doc for info."
|
|
|
634 # endif
|
|
|
635 if (STRCMP(p_sws, "fsync") == 0)
|
|
|
636 {
|
|
|
637 if (fsync(mfp->mf_fd))
|
|
|
638 status = FAIL;
|
|
|
639 }
|
|
|
640 else
|
|
|
641 # endif
|
|
|
642 /* OpenNT is strictly POSIX (Benzinger) */
|
|
|
643 /* Tandem/Himalaya NSK-OSS doesn't have sync() */
|
|
|
644 # if defined(__OPENNT) || defined(__TANDEM)
|
|
|
645 fflush(NULL);
|
|
|
646 # else
|
|
|
647 sync();
|
|
|
648 # endif
|
|
|
649 #endif
|
|
|
650 #ifdef VMS
|
|
|
651 if (STRCMP(p_sws, "fsync") == 0)
|
|
|
652 {
|
|
|
653 if (fsync(mfp->mf_fd))
|
|
|
654 status = FAIL;
|
|
|
655 }
|
|
|
656 #endif
|
|
|
657 #ifdef MSDOS
|
|
|
658 if (_dos_commit(mfp->mf_fd))
|
|
|
659 status = FAIL;
|
|
|
660 #else
|
|
|
661 # ifdef SYNC_DUP_CLOSE
|
|
|
662 /*
|
|
|
663 * Win32 is a bit more work: Duplicate the file handle and close it.
|
|
|
664 * This should flush the file to disk.
|
|
|
665 */
|
|
|
666 if ((fd = dup(mfp->mf_fd)) >= 0)
|
|
|
667 close(fd);
|
|
|
668 # endif
|
|
|
669 #endif
|
|
|
670 #ifdef AMIGA
|
|
1030
|
671 # if defined(__AROS__) || defined(__amigaos4__)
|
|
7
|
672 if (fsync(mfp->mf_fd) != 0)
|
|
|
673 status = FAIL;
|
|
|
674 # else
|
|
|
675 /*
|
|
|
676 * Flush() only exists for AmigaDos 2.0.
|
|
|
677 * For 1.3 it should be done with close() + open(), but then the risk
|
|
|
678 * is that the open() may fail and lose the file....
|
|
|
679 */
|
|
|
680 # ifdef FEAT_ARP
|
|
|
681 if (dos2)
|
|
|
682 # endif
|
|
|
683 # ifdef SASC
|
|
|
684 {
|
|
|
685 struct UFB *fp = chkufb(mfp->mf_fd);
|
|
|
686
|
|
|
687 if (fp != NULL)
|
|
|
688 Flush(fp->ufbfh);
|
|
|
689 }
|
|
|
690 # else
|
|
|
691 # if defined(_DCC) || defined(__GNUC__) || defined(__MORPHOS__)
|
|
|
692 {
|
|
984
|
693 # if defined(__GNUC__) && !defined(__MORPHOS__) && defined(__libnix__)
|
|
7
|
694 /* Have function (in libnix at least),
|
|
|
695 * but ain't got no prototype anywhere. */
|
|
|
696 extern unsigned long fdtofh(int filedescriptor);
|
|
|
697 # endif
|
|
984
|
698 # if !defined(__libnix__)
|
|
|
699 fflush(NULL);
|
|
|
700 # else
|
|
7
|
701 BPTR fh = (BPTR)fdtofh(mfp->mf_fd);
|
|
|
702
|
|
|
703 if (fh != 0)
|
|
|
704 Flush(fh);
|
|
984
|
705 # endif
|
|
7
|
706 }
|
|
|
707 # else /* assume Manx */
|
|
|
708 Flush(_devtab[mfp->mf_fd].fd);
|
|
|
709 # endif
|
|
|
710 # endif
|
|
|
711 # endif
|
|
|
712 #endif /* AMIGA */
|
|
|
713 }
|
|
|
714
|
|
|
715 got_int |= got_int_save;
|
|
|
716
|
|
|
717 return status;
|
|
|
718 }
|
|
|
719
|
|
|
720 /*
|
|
630
|
721 * For all blocks in memory file *mfp that have a positive block number set
|
|
|
722 * the dirty flag. These are blocks that need to be written to a newly
|
|
|
723 * created swapfile.
|
|
|
724 */
|
|
|
725 void
|
|
|
726 mf_set_dirty(mfp)
|
|
|
727 memfile_T *mfp;
|
|
|
728 {
|
|
|
729 bhdr_T *hp;
|
|
|
730
|
|
|
731 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev)
|
|
|
732 if (hp->bh_bnum > 0)
|
|
|
733 hp->bh_flags |= BH_DIRTY;
|
|
|
734 mfp->mf_dirty = TRUE;
|
|
|
735 }
|
|
|
736
|
|
|
737 /*
|
|
7
|
738 * insert block *hp in front of hashlist of memfile *mfp
|
|
|
739 */
|
|
|
740 static void
|
|
|
741 mf_ins_hash(mfp, hp)
|
|
|
742 memfile_T *mfp;
|
|
|
743 bhdr_T *hp;
|
|
|
744 {
|
|
|
745 bhdr_T *hhp;
|
|
|
746 int hash;
|
|
|
747
|
|
|
748 hash = MEMHASH(hp->bh_bnum);
|
|
|
749 hhp = mfp->mf_hash[hash];
|
|
|
750 hp->bh_hash_next = hhp;
|
|
|
751 hp->bh_hash_prev = NULL;
|
|
|
752 if (hhp != NULL)
|
|
|
753 hhp->bh_hash_prev = hp;
|
|
|
754 mfp->mf_hash[hash] = hp;
|
|
|
755 }
|
|
|
756
|
|
|
757 /*
|
|
|
758 * remove block *hp from hashlist of memfile list *mfp
|
|
|
759 */
|
|
|
760 static void
|
|
|
761 mf_rem_hash(mfp, hp)
|
|
|
762 memfile_T *mfp;
|
|
|
763 bhdr_T *hp;
|
|
|
764 {
|
|
|
765 if (hp->bh_hash_prev == NULL)
|
|
|
766 mfp->mf_hash[MEMHASH(hp->bh_bnum)] = hp->bh_hash_next;
|
|
|
767 else
|
|
|
768 hp->bh_hash_prev->bh_hash_next = hp->bh_hash_next;
|
|
|
769
|
|
|
770 if (hp->bh_hash_next)
|
|
|
771 hp->bh_hash_next->bh_hash_prev = hp->bh_hash_prev;
|
|
|
772 }
|
|
|
773
|
|
|
774 /*
|
|
|
775 * look in hash lists of memfile *mfp for block header with number 'nr'
|
|
|
776 */
|
|
|
777 static bhdr_T *
|
|
|
778 mf_find_hash(mfp, nr)
|
|
|
779 memfile_T *mfp;
|
|
|
780 blocknr_T nr;
|
|
|
781 {
|
|
|
782 bhdr_T *hp;
|
|
|
783
|
|
|
784 for (hp = mfp->mf_hash[MEMHASH(nr)]; hp != NULL; hp = hp->bh_hash_next)
|
|
|
785 if (hp->bh_bnum == nr)
|
|
|
786 break;
|
|
|
787 return hp;
|
|
|
788 }
|
|
|
789
|
|
|
790 /*
|
|
|
791 * insert block *hp in front of used list of memfile *mfp
|
|
|
792 */
|
|
|
793 static void
|
|
|
794 mf_ins_used(mfp, hp)
|
|
|
795 memfile_T *mfp;
|
|
|
796 bhdr_T *hp;
|
|
|
797 {
|
|
|
798 hp->bh_next = mfp->mf_used_first;
|
|
|
799 mfp->mf_used_first = hp;
|
|
|
800 hp->bh_prev = NULL;
|
|
|
801 if (hp->bh_next == NULL) /* list was empty, adjust last pointer */
|
|
|
802 mfp->mf_used_last = hp;
|
|
|
803 else
|
|
|
804 hp->bh_next->bh_prev = hp;
|
|
|
805 mfp->mf_used_count += hp->bh_page_count;
|
|
|
806 total_mem_used += hp->bh_page_count * mfp->mf_page_size;
|
|
|
807 }
|
|
|
808
|
|
|
809 /*
|
|
|
810 * remove block *hp from used list of memfile *mfp
|
|
|
811 */
|
|
|
812 static void
|
|
|
813 mf_rem_used(mfp, hp)
|
|
|
814 memfile_T *mfp;
|
|
|
815 bhdr_T *hp;
|
|
|
816 {
|
|
|
817 if (hp->bh_next == NULL) /* last block in used list */
|
|
|
818 mfp->mf_used_last = hp->bh_prev;
|
|
|
819 else
|
|
|
820 hp->bh_next->bh_prev = hp->bh_prev;
|
|
|
821 if (hp->bh_prev == NULL) /* first block in used list */
|
|
|
822 mfp->mf_used_first = hp->bh_next;
|
|
|
823 else
|
|
|
824 hp->bh_prev->bh_next = hp->bh_next;
|
|
|
825 mfp->mf_used_count -= hp->bh_page_count;
|
|
|
826 total_mem_used -= hp->bh_page_count * mfp->mf_page_size;
|
|
|
827 }
|
|
|
828
|
|
|
829 /*
|
|
|
830 * Release the least recently used block from the used list if the number
|
|
|
831 * of used memory blocks gets to big.
|
|
|
832 *
|
|
|
833 * Return the block header to the caller, including the memory block, so
|
|
|
834 * it can be re-used. Make sure the page_count is right.
|
|
|
835 */
|
|
|
836 static bhdr_T *
|
|
|
837 mf_release(mfp, page_count)
|
|
|
838 memfile_T *mfp;
|
|
|
839 int page_count;
|
|
|
840 {
|
|
|
841 bhdr_T *hp;
|
|
|
842 int need_release;
|
|
|
843 buf_T *buf;
|
|
|
844
|
|
|
845 /* don't release while in mf_close_file() */
|
|
1066
|
846 if (mf_dont_release)
|
|
7
|
847 return NULL;
|
|
|
848
|
|
|
849 /*
|
|
|
850 * Need to release a block if the number of blocks for this memfile is
|
|
|
851 * higher than the maximum or total memory used is over 'maxmemtot'
|
|
|
852 */
|
|
|
853 need_release = ((mfp->mf_used_count >= mfp->mf_used_count_max)
|
|
|
854 || (total_mem_used >> 10) >= (long_u)p_mmt);
|
|
|
855
|
|
|
856 /*
|
|
|
857 * Try to create a swap file if the amount of memory used is getting too
|
|
|
858 * high.
|
|
|
859 */
|
|
|
860 if (mfp->mf_fd < 0 && need_release && p_uc)
|
|
|
861 {
|
|
|
862 /* find for which buffer this memfile is */
|
|
|
863 for (buf = firstbuf; buf != NULL; buf = buf->b_next)
|
|
|
864 if (buf->b_ml.ml_mfp == mfp)
|
|
|
865 break;
|
|
|
866 if (buf != NULL && buf->b_may_swap)
|
|
|
867 ml_open_file(buf);
|
|
|
868 }
|
|
|
869
|
|
|
870 /*
|
|
|
871 * don't release a block if
|
|
|
872 * there is no file for this memfile
|
|
|
873 * or
|
|
|
874 * the number of blocks for this memfile is lower than the maximum
|
|
|
875 * and
|
|
|
876 * total memory used is not up to 'maxmemtot'
|
|
|
877 */
|
|
|
878 if (mfp->mf_fd < 0 || !need_release)
|
|
|
879 return NULL;
|
|
|
880
|
|
|
881 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev)
|
|
|
882 if (!(hp->bh_flags & BH_LOCKED))
|
|
|
883 break;
|
|
|
884 if (hp == NULL) /* not a single one that can be released */
|
|
|
885 return NULL;
|
|
|
886
|
|
|
887 /*
|
|
|
888 * If the block is dirty, write it.
|
|
|
889 * If the write fails we don't free it.
|
|
|
890 */
|
|
|
891 if ((hp->bh_flags & BH_DIRTY) && mf_write(mfp, hp) == FAIL)
|
|
|
892 return NULL;
|
|
|
893
|
|
|
894 mf_rem_used(mfp, hp);
|
|
|
895 mf_rem_hash(mfp, hp);
|
|
|
896
|
|
|
897 /*
|
|
|
898 * If a bhdr_T is returned, make sure that the page_count of bh_data is
|
|
|
899 * right
|
|
|
900 */
|
|
|
901 if (hp->bh_page_count != page_count)
|
|
|
902 {
|
|
|
903 vim_free(hp->bh_data);
|
|
|
904 if ((hp->bh_data = alloc(mfp->mf_page_size * page_count)) == NULL)
|
|
|
905 {
|
|
|
906 vim_free(hp);
|
|
|
907 return NULL;
|
|
|
908 }
|
|
|
909 hp->bh_page_count = page_count;
|
|
|
910 }
|
|
|
911 return hp;
|
|
|
912 }
|
|
|
913
|
|
|
914 /*
|
|
|
915 * release as many blocks as possible
|
|
|
916 * Used in case of out of memory
|
|
|
917 *
|
|
|
918 * return TRUE if any memory was released
|
|
|
919 */
|
|
|
920 int
|
|
|
921 mf_release_all()
|
|
|
922 {
|
|
|
923 buf_T *buf;
|
|
|
924 memfile_T *mfp;
|
|
|
925 bhdr_T *hp;
|
|
|
926 int retval = FALSE;
|
|
|
927
|
|
|
928 for (buf = firstbuf; buf != NULL; buf = buf->b_next)
|
|
|
929 {
|
|
|
930 mfp = buf->b_ml.ml_mfp;
|
|
|
931 if (mfp != NULL)
|
|
|
932 {
|
|
|
933 /* If no swap file yet, may open one */
|
|
|
934 if (mfp->mf_fd < 0 && buf->b_may_swap)
|
|
|
935 ml_open_file(buf);
|
|
|
936
|
|
|
937 /* only if there is a swapfile */
|
|
|
938 if (mfp->mf_fd >= 0)
|
|
|
939 {
|
|
|
940 for (hp = mfp->mf_used_last; hp != NULL; )
|
|
|
941 {
|
|
|
942 if (!(hp->bh_flags & BH_LOCKED)
|
|
|
943 && (!(hp->bh_flags & BH_DIRTY)
|
|
|
944 || mf_write(mfp, hp) != FAIL))
|
|
|
945 {
|
|
|
946 mf_rem_used(mfp, hp);
|
|
|
947 mf_rem_hash(mfp, hp);
|
|
|
948 mf_free_bhdr(hp);
|
|
|
949 hp = mfp->mf_used_last; /* re-start, list was changed */
|
|
|
950 retval = TRUE;
|
|
|
951 }
|
|
|
952 else
|
|
|
953 hp = hp->bh_prev;
|
|
|
954 }
|
|
|
955 }
|
|
|
956 }
|
|
|
957 }
|
|
|
958 return retval;
|
|
|
959 }
|
|
|
960
|
|
|
961 /*
|
|
|
962 * Allocate a block header and a block of memory for it
|
|
|
963 */
|
|
|
964 static bhdr_T *
|
|
|
965 mf_alloc_bhdr(mfp, page_count)
|
|
|
966 memfile_T *mfp;
|
|
|
967 int page_count;
|
|
|
968 {
|
|
|
969 bhdr_T *hp;
|
|
|
970
|
|
|
971 if ((hp = (bhdr_T *)alloc((unsigned)sizeof(bhdr_T))) != NULL)
|
|
|
972 {
|
|
|
973 if ((hp->bh_data = (char_u *)alloc(mfp->mf_page_size * page_count))
|
|
|
974 == NULL)
|
|
|
975 {
|
|
|
976 vim_free(hp); /* not enough memory */
|
|
|
977 return NULL;
|
|
|
978 }
|
|
|
979 hp->bh_page_count = page_count;
|
|
|
980 }
|
|
|
981 return hp;
|
|
|
982 }
|
|
|
983
|
|
|
984 /*
|
|
|
985 * Free a block header and the block of memory for it
|
|
|
986 */
|
|
|
987 static void
|
|
|
988 mf_free_bhdr(hp)
|
|
|
989 bhdr_T *hp;
|
|
|
990 {
|
|
|
991 vim_free(hp->bh_data);
|
|
|
992 vim_free(hp);
|
|
|
993 }
|
|
|
994
|
|
|
995 /*
|
|
|
996 * insert entry *hp in the free list
|
|
|
997 */
|
|
|
998 static void
|
|
|
999 mf_ins_free(mfp, hp)
|
|
|
1000 memfile_T *mfp;
|
|
|
1001 bhdr_T *hp;
|
|
|
1002 {
|
|
|
1003 hp->bh_next = mfp->mf_free_first;
|
|
|
1004 mfp->mf_free_first = hp;
|
|
|
1005 }
|
|
|
1006
|
|
|
1007 /*
|
|
|
1008 * remove the first entry from the free list and return a pointer to it
|
|
|
1009 * Note: caller must check that mfp->mf_free_first is not NULL!
|
|
|
1010 */
|
|
|
1011 static bhdr_T *
|
|
|
1012 mf_rem_free(mfp)
|
|
|
1013 memfile_T *mfp;
|
|
|
1014 {
|
|
|
1015 bhdr_T *hp;
|
|
|
1016
|
|
|
1017 hp = mfp->mf_free_first;
|
|
|
1018 mfp->mf_free_first = hp->bh_next;
|
|
|
1019 return hp;
|
|
|
1020 }
|
|
|
1021
|
|
|
1022 /*
|
|
|
1023 * read a block from disk
|
|
|
1024 *
|
|
|
1025 * Return FAIL for failure, OK otherwise
|
|
|
1026 */
|
|
|
1027 static int
|
|
|
1028 mf_read(mfp, hp)
|
|
|
1029 memfile_T *mfp;
|
|
|
1030 bhdr_T *hp;
|
|
|
1031 {
|
|
|
1032 off_t offset;
|
|
|
1033 unsigned page_size;
|
|
|
1034 unsigned size;
|
|
|
1035
|
|
|
1036 if (mfp->mf_fd < 0) /* there is no file, can't read */
|
|
|
1037 return FAIL;
|
|
|
1038
|
|
|
1039 page_size = mfp->mf_page_size;
|
|
|
1040 offset = (off_t)page_size * hp->bh_bnum;
|
|
|
1041 size = page_size * hp->bh_page_count;
|
|
|
1042 if (lseek(mfp->mf_fd, offset, SEEK_SET) != offset)
|
|
|
1043 {
|
|
1033
|
1044 PERROR(_("E294: Seek error in swap file read"));
|
|
7
|
1045 return FAIL;
|
|
|
1046 }
|
|
|
1047 if ((unsigned)vim_read(mfp->mf_fd, hp->bh_data, size) != size)
|
|
|
1048 {
|
|
1033
|
1049 PERROR(_("E295: Read error in swap file"));
|
|
7
|
1050 return FAIL;
|
|
|
1051 }
|
|
|
1052 return OK;
|
|
|
1053 }
|
|
|
1054
|
|
|
1055 /*
|
|
|
1056 * write a block to disk
|
|
|
1057 *
|
|
|
1058 * Return FAIL for failure, OK otherwise
|
|
|
1059 */
|
|
|
1060 static int
|
|
|
1061 mf_write(mfp, hp)
|
|
|
1062 memfile_T *mfp;
|
|
|
1063 bhdr_T *hp;
|
|
|
1064 {
|
|
|
1065 off_t offset; /* offset in the file */
|
|
|
1066 blocknr_T nr; /* block nr which is being written */
|
|
|
1067 bhdr_T *hp2;
|
|
|
1068 unsigned page_size; /* number of bytes in a page */
|
|
|
1069 unsigned page_count; /* number of pages written */
|
|
|
1070 unsigned size; /* number of bytes written */
|
|
|
1071
|
|
|
1072 if (mfp->mf_fd < 0) /* there is no file, can't write */
|
|
|
1073 return FAIL;
|
|
|
1074
|
|
|
1075 if (hp->bh_bnum < 0) /* must assign file block number */
|
|
|
1076 if (mf_trans_add(mfp, hp) == FAIL)
|
|
|
1077 return FAIL;
|
|
|
1078
|
|
|
1079 page_size = mfp->mf_page_size;
|
|
|
1080
|
|
|
1081 /*
|
|
|
1082 * We don't want gaps in the file. Write the blocks in front of *hp
|
|
|
1083 * to extend the file.
|
|
|
1084 * If block 'mf_infile_count' is not in the hash list, it has been
|
|
|
1085 * freed. Fill the space in the file with data from the current block.
|
|
|
1086 */
|
|
|
1087 for (;;)
|
|
|
1088 {
|
|
|
1089 nr = hp->bh_bnum;
|
|
|
1090 if (nr > mfp->mf_infile_count) /* beyond end of file */
|
|
|
1091 {
|
|
|
1092 nr = mfp->mf_infile_count;
|
|
|
1093 hp2 = mf_find_hash(mfp, nr); /* NULL catched below */
|
|
|
1094 }
|
|
|
1095 else
|
|
|
1096 hp2 = hp;
|
|
|
1097
|
|
|
1098 offset = (off_t)page_size * nr;
|
|
|
1099 if (lseek(mfp->mf_fd, offset, SEEK_SET) != offset)
|
|
|
1100 {
|
|
1033
|
1101 PERROR(_("E296: Seek error in swap file write"));
|
|
7
|
1102 return FAIL;
|
|
|
1103 }
|
|
|
1104 if (hp2 == NULL) /* freed block, fill with dummy data */
|
|
|
1105 page_count = 1;
|
|
|
1106 else
|
|
|
1107 page_count = hp2->bh_page_count;
|
|
|
1108 size = page_size * page_count;
|
|
|
1109 if ((unsigned)vim_write(mfp->mf_fd,
|
|
|
1110 (hp2 == NULL ? hp : hp2)->bh_data, size) != size)
|
|
|
1111 {
|
|
|
1112 /*
|
|
|
1113 * Avoid repeating the error message, this mostly happens when the
|
|
1226
|
1114 * disk is full. We give the message again only after a successful
|
|
7
|
1115 * write or when hitting a key. We keep on trying, in case some
|
|
|
1116 * space becomes available.
|
|
|
1117 */
|
|
|
1118 if (!did_swapwrite_msg)
|
|
|
1119 EMSG(_("E297: Write error in swap file"));
|
|
|
1120 did_swapwrite_msg = TRUE;
|
|
|
1121 return FAIL;
|
|
|
1122 }
|
|
|
1123 did_swapwrite_msg = FALSE;
|
|
|
1124 if (hp2 != NULL) /* written a non-dummy block */
|
|
|
1125 hp2->bh_flags &= ~BH_DIRTY;
|
|
|
1126 /* appended to the file */
|
|
|
1127 if (nr + (blocknr_T)page_count > mfp->mf_infile_count)
|
|
|
1128 mfp->mf_infile_count = nr + page_count;
|
|
|
1129 if (nr == hp->bh_bnum) /* written the desired block */
|
|
|
1130 break;
|
|
|
1131 }
|
|
|
1132 return OK;
|
|
|
1133 }
|
|
|
1134
|
|
|
1135 /*
|
|
|
1136 * Make block number for *hp positive and add it to the translation list
|
|
|
1137 *
|
|
|
1138 * Return FAIL for failure, OK otherwise
|
|
|
1139 */
|
|
|
1140 static int
|
|
|
1141 mf_trans_add(mfp, hp)
|
|
|
1142 memfile_T *mfp;
|
|
|
1143 bhdr_T *hp;
|
|
|
1144 {
|
|
|
1145 bhdr_T *freep;
|
|
|
1146 blocknr_T new_bnum;
|
|
|
1147 int hash;
|
|
|
1148 NR_TRANS *np;
|
|
|
1149 int page_count;
|
|
|
1150
|
|
|
1151 if (hp->bh_bnum >= 0) /* it's already positive */
|
|
|
1152 return OK;
|
|
|
1153
|
|
|
1154 if ((np = (NR_TRANS *)alloc((unsigned)sizeof(NR_TRANS))) == NULL)
|
|
|
1155 return FAIL;
|
|
|
1156
|
|
|
1157 /*
|
|
|
1158 * get a new number for the block.
|
|
|
1159 * If the first item in the free list has sufficient pages, use its number
|
|
|
1160 * Otherwise use mf_blocknr_max.
|
|
|
1161 */
|
|
|
1162 freep = mfp->mf_free_first;
|
|
|
1163 page_count = hp->bh_page_count;
|
|
|
1164 if (freep != NULL && freep->bh_page_count >= page_count)
|
|
|
1165 {
|
|
|
1166 new_bnum = freep->bh_bnum;
|
|
|
1167 /*
|
|
|
1168 * If the page count of the free block was larger, recude it.
|
|
|
1169 * If the page count matches, remove the block from the free list
|
|
|
1170 */
|
|
|
1171 if (freep->bh_page_count > page_count)
|
|
|
1172 {
|
|
|
1173 freep->bh_bnum += page_count;
|
|
|
1174 freep->bh_page_count -= page_count;
|
|
|
1175 }
|
|
|
1176 else
|
|
|
1177 {
|
|
|
1178 freep = mf_rem_free(mfp);
|
|
|
1179 vim_free(freep);
|
|
|
1180 }
|
|
|
1181 }
|
|
|
1182 else
|
|
|
1183 {
|
|
|
1184 new_bnum = mfp->mf_blocknr_max;
|
|
|
1185 mfp->mf_blocknr_max += page_count;
|
|
|
1186 }
|
|
|
1187
|
|
|
1188 np->nt_old_bnum = hp->bh_bnum; /* adjust number */
|
|
|
1189 np->nt_new_bnum = new_bnum;
|
|
|
1190
|
|
|
1191 mf_rem_hash(mfp, hp); /* remove from old hash list */
|
|
|
1192 hp->bh_bnum = new_bnum;
|
|
|
1193 mf_ins_hash(mfp, hp); /* insert in new hash list */
|
|
|
1194
|
|
|
1195 hash = MEMHASH(np->nt_old_bnum); /* insert in trans list */
|
|
|
1196 np->nt_next = mfp->mf_trans[hash];
|
|
|
1197 mfp->mf_trans[hash] = np;
|
|
|
1198 if (np->nt_next != NULL)
|
|
|
1199 np->nt_next->nt_prev = np;
|
|
|
1200 np->nt_prev = NULL;
|
|
|
1201
|
|
|
1202 return OK;
|
|
|
1203 }
|
|
|
1204
|
|
|
1205 /*
|
|
1226
|
1206 * Lookup a translation from the trans lists and delete the entry
|
|
7
|
1207 *
|
|
|
1208 * Return the positive new number when found, the old number when not found
|
|
|
1209 */
|
|
|
1210 blocknr_T
|
|
|
1211 mf_trans_del(mfp, old_nr)
|
|
|
1212 memfile_T *mfp;
|
|
|
1213 blocknr_T old_nr;
|
|
|
1214 {
|
|
|
1215 int hash;
|
|
|
1216 NR_TRANS *np;
|
|
|
1217 blocknr_T new_bnum;
|
|
|
1218
|
|
|
1219 hash = MEMHASH(old_nr);
|
|
|
1220 for (np = mfp->mf_trans[hash]; np != NULL; np = np->nt_next)
|
|
|
1221 if (np->nt_old_bnum == old_nr)
|
|
|
1222 break;
|
|
|
1223 if (np == NULL) /* not found */
|
|
|
1224 return old_nr;
|
|
|
1225
|
|
|
1226 mfp->mf_neg_count--;
|
|
|
1227 new_bnum = np->nt_new_bnum;
|
|
|
1228 if (np->nt_prev != NULL) /* remove entry from the trans list */
|
|
|
1229 np->nt_prev->nt_next = np->nt_next;
|
|
|
1230 else
|
|
|
1231 mfp->mf_trans[hash] = np->nt_next;
|
|
|
1232 if (np->nt_next != NULL)
|
|
|
1233 np->nt_next->nt_prev = np->nt_prev;
|
|
|
1234 vim_free(np);
|
|
|
1235
|
|
|
1236 return new_bnum;
|
|
|
1237 }
|
|
|
1238
|
|
|
1239 /*
|
|
|
1240 * Set mfp->mf_ffname according to mfp->mf_fname and some other things.
|
|
|
1241 * Only called when creating or renaming the swapfile. Either way it's a new
|
|
|
1242 * name so we must work out the full path name.
|
|
|
1243 */
|
|
|
1244 void
|
|
|
1245 mf_set_ffname(mfp)
|
|
|
1246 memfile_T *mfp;
|
|
|
1247 {
|
|
|
1248 mfp->mf_ffname = FullName_save(mfp->mf_fname, FALSE);
|
|
|
1249 }
|
|
|
1250
|
|
|
1251 /*
|
|
|
1252 * Make the name of the file used for the memfile a full path.
|
|
|
1253 * Used before doing a :cd
|
|
|
1254 */
|
|
|
1255 void
|
|
|
1256 mf_fullname(mfp)
|
|
|
1257 memfile_T *mfp;
|
|
|
1258 {
|
|
|
1259 if (mfp != NULL && mfp->mf_fname != NULL && mfp->mf_ffname != NULL)
|
|
|
1260 {
|
|
|
1261 vim_free(mfp->mf_fname);
|
|
|
1262 mfp->mf_fname = mfp->mf_ffname;
|
|
|
1263 mfp->mf_ffname = NULL;
|
|
|
1264 }
|
|
|
1265 }
|
|
|
1266
|
|
|
1267 /*
|
|
|
1268 * return TRUE if there are any translations pending for 'mfp'
|
|
|
1269 */
|
|
|
1270 int
|
|
|
1271 mf_need_trans(mfp)
|
|
|
1272 memfile_T *mfp;
|
|
|
1273 {
|
|
|
1274 return (mfp->mf_fname != NULL && mfp->mf_neg_count > 0);
|
|
|
1275 }
|
|
|
1276
|
|
|
1277 /*
|
|
|
1278 * Open a swap file for a memfile.
|
|
|
1279 * The "fname" must be in allocated memory, and is consumed (also when an
|
|
|
1280 * error occurs).
|
|
|
1281 */
|
|
|
1282 static void
|
|
|
1283 mf_do_open(mfp, fname, flags)
|
|
|
1284 memfile_T *mfp;
|
|
|
1285 char_u *fname;
|
|
|
1286 int flags; /* flags for open() */
|
|
|
1287 {
|
|
|
1288 #ifdef HAVE_LSTAT
|
|
|
1289 struct stat sb;
|
|
|
1290 #endif
|
|
|
1291
|
|
|
1292 mfp->mf_fname = fname;
|
|
|
1293
|
|
|
1294 /*
|
|
|
1295 * Get the full path name before the open, because this is
|
|
|
1296 * not possible after the open on the Amiga.
|
|
|
1297 * fname cannot be NameBuff, because it must have been allocated.
|
|
|
1298 */
|
|
|
1299 mf_set_ffname(mfp);
|
|
|
1300 #if defined(MSDOS) || defined(MSWIN) || defined(RISCOS)
|
|
|
1301 /*
|
|
|
1302 * A ":!cd e:xxx" may change the directory without us knowning, use the
|
|
|
1303 * full pathname always. Careful: This frees fname!
|
|
|
1304 */
|
|
|
1305 mf_fullname(mfp);
|
|
|
1306 #endif
|
|
|
1307
|
|
|
1308 #ifdef HAVE_LSTAT
|
|
|
1309 /*
|
|
|
1310 * Extra security check: When creating a swap file it really shouldn't
|
|
|
1311 * exist yet. If there is a symbolic link, this is most likely an attack.
|
|
|
1312 */
|
|
|
1313 if ((flags & O_CREAT) && mch_lstat((char *)mfp->mf_fname, &sb) >= 0)
|
|
|
1314 {
|
|
|
1315 mfp->mf_fd = -1;
|
|
|
1316 EMSG(_("E300: Swap file already exists (symlink attack?)"));
|
|
|
1317 }
|
|
|
1318 else
|
|
|
1319 #endif
|
|
|
1320 {
|
|
|
1321 /*
|
|
|
1322 * try to open the file
|
|
|
1323 */
|
|
557
|
1324 flags |= O_EXTRA | O_NOFOLLOW;
|
|
7
|
1325 #ifdef WIN32
|
|
|
1326 /* Prevent handle inheritance that cause problems with Cscope
|
|
|
1327 * (swap file may not be deleted if cscope connection was open after
|
|
|
1328 * the file) */
|
|
|
1329 flags |= O_NOINHERIT;
|
|
|
1330 #endif
|
|
|
1331 mfp->mf_fd = mch_open_rw((char *)mfp->mf_fname, flags);
|
|
|
1332 }
|
|
|
1333
|
|
|
1334 /*
|
|
|
1335 * If the file cannot be opened, use memory only
|
|
|
1336 */
|
|
|
1337 if (mfp->mf_fd < 0)
|
|
|
1338 {
|
|
|
1339 vim_free(mfp->mf_fname);
|
|
|
1340 vim_free(mfp->mf_ffname);
|
|
|
1341 mfp->mf_fname = NULL;
|
|
|
1342 mfp->mf_ffname = NULL;
|
|
|
1343 }
|
|
|
1344 else
|
|
1583
|
1345 {
|
|
|
1346 #ifdef HAVE_SELINUX
|
|
|
1347 mch_copy_sec(fname, mfp->mf_fname);
|
|
|
1348 #endif
|
|
7
|
1349 mch_hide(mfp->mf_fname); /* try setting the 'hidden' flag */
|
|
1583
|
1350 }
|
|
7
|
1351 }
|
