Mercurial > vim
annotate src/memfile.c @ 22847:4d9b91d6e29a
Added tag v8.2.1970 for changeset 83c2c489cb1b2208f3facc7b7de432c7b1efe7b7
| author | Bram Moolenaar <Bram@vim.org> |
|---|---|
| date | Mon, 09 Nov 2020 21:15:04 +0100 |
| parents | bb3f60b0aca0 |
| children | d32ffc07cc3d |
| rev | line source |
|---|---|
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1 /* vi:set ts=8 sts=4 sw=4 noet: |
| 7 | 2 * |
| 3 * VIM - Vi IMproved by Bram Moolenaar | |
| 4 * | |
| 5 * Do ":help uganda" in Vim to read copying and usage conditions. | |
| 6 * Do ":help credits" in Vim to see a list of people who contributed. | |
| 7 * See README.txt for an overview of the Vim source code. | |
| 8 */ | |
| 9 | |
| 10 /* | |
| 11 * memfile.c: Contains the functions for handling blocks of memory which can | |
| 12 * be stored in a file. This is the implementation of a sort of virtual memory. | |
| 13 * | |
| 14 * A memfile consists of a sequence of blocks. The blocks numbered from 0 | |
| 15 * upwards have been assigned a place in the actual file. The block number | |
| 16 * is equal to the page number in the file. The | |
| 17 * blocks with negative numbers are currently in memory only. They can be | |
| 18 * assigned a place in the file when too much memory is being used. At that | |
| 19 * moment they get a new, positive, number. A list is used for translation of | |
| 20 * negative to positive numbers. | |
| 21 * | |
| 22 * The size of a block is a multiple of a page size, normally the page size of | |
| 23 * the device the file is on. Most blocks are 1 page long. A Block of multiple | |
| 24 * pages is used for a line that does not fit in a single page. | |
| 25 * | |
| 26 * Each block can be in memory and/or in a file. The block stays in memory | |
| 27 * as long as it is locked. If it is no longer locked it can be swapped out to | |
| 28 * the file. It is only written to the file if it has been changed. | |
| 29 * | |
| 30 * Under normal operation the file is created when opening the memory file and | |
| 31 * deleted when closing the memory file. Only with recovery an existing memory | |
| 32 * file is opened. | |
| 33 */ | |
| 34 | |
| 35 #include "vim.h" | |
| 36 | |
| 37 /* | |
| 38 * Some systems have the page size in statfs.f_bsize, some in stat.st_blksize | |
| 39 */ | |
| 40 #ifdef HAVE_ST_BLKSIZE | |
| 41 # define STATFS stat | |
| 42 # define F_BSIZE st_blksize | |
| 43 # define fstatfs(fd, buf, len, nul) mch_fstat((fd), (buf)) | |
| 44 #else | |
| 45 # ifdef HAVE_SYS_STATFS_H | |
| 46 # include <sys/statfs.h> | |
| 47 # define STATFS statfs | |
| 48 # define F_BSIZE f_bsize | |
| 49 # endif | |
| 50 #endif | |
| 51 | |
| 52 /* | |
| 53 * for Amiga Dos 2.0x we use Flush | |
| 54 */ | |
| 55 #ifdef AMIGA | |
| 56 # ifdef FEAT_ARP | |
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57 extern int dos2; // this is in os_amiga.c |
| 7 | 58 # endif |
| 59 # ifdef SASC | |
| 60 # include <proto/dos.h> | |
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61 # include <ios1.h> // for chkufb() |
| 7 | 62 # endif |
| 63 #endif | |
| 64 | |
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65 #define MEMFILE_PAGE_SIZE 4096 // default page size |
| 7 | 66 |
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67 static long_u total_mem_used = 0; // total memory used for memfiles |
| 7 | 68 |
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69 static void mf_ins_hash(memfile_T *, bhdr_T *); |
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70 static void mf_rem_hash(memfile_T *, bhdr_T *); |
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71 static bhdr_T *mf_find_hash(memfile_T *, blocknr_T); |
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72 static void mf_ins_used(memfile_T *, bhdr_T *); |
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73 static void mf_rem_used(memfile_T *, bhdr_T *); |
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74 static bhdr_T *mf_release(memfile_T *, int); |
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75 static bhdr_T *mf_alloc_bhdr(memfile_T *, int); |
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76 static void mf_free_bhdr(bhdr_T *); |
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77 static void mf_ins_free(memfile_T *, bhdr_T *); |
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78 static bhdr_T *mf_rem_free(memfile_T *); |
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79 static int mf_read(memfile_T *, bhdr_T *); |
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80 static int mf_write(memfile_T *, bhdr_T *); |
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81 static int mf_write_block(memfile_T *mfp, bhdr_T *hp, off_T offset, unsigned size); |
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82 static int mf_trans_add(memfile_T *, bhdr_T *); |
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83 static void mf_do_open(memfile_T *, char_u *, int); |
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84 static void mf_hash_init(mf_hashtab_T *); |
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85 static void mf_hash_free(mf_hashtab_T *); |
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86 static void mf_hash_free_all(mf_hashtab_T *); |
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87 static mf_hashitem_T *mf_hash_find(mf_hashtab_T *, blocknr_T); |
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88 static void mf_hash_add_item(mf_hashtab_T *, mf_hashitem_T *); |
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89 static void mf_hash_rem_item(mf_hashtab_T *, mf_hashitem_T *); |
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90 static int mf_hash_grow(mf_hashtab_T *); |
| 7 | 91 |
| 92 /* | |
| 93 * The functions for using a memfile: | |
| 94 * | |
| 95 * mf_open() open a new or existing memfile | |
| 96 * mf_open_file() open a swap file for an existing memfile | |
| 97 * mf_close() close (and delete) a memfile | |
| 98 * mf_new() create a new block in a memfile and lock it | |
| 99 * mf_get() get an existing block and lock it | |
| 100 * mf_put() unlock a block, may be marked for writing | |
| 101 * mf_free() remove a block | |
| 102 * mf_sync() sync changed parts of memfile to disk | |
| 103 * mf_release_all() release as much memory as possible | |
| 104 * mf_trans_del() may translate negative to positive block number | |
| 105 * mf_fullname() make file name full path (use before first :cd) | |
| 106 */ | |
| 107 | |
| 108 /* | |
| 109 * Open an existing or new memory block file. | |
| 110 * | |
| 111 * fname: name of file to use (NULL means no file at all) | |
| 112 * Note: fname must have been allocated, it is not copied! | |
| 113 * If opening the file fails, fname is freed. | |
| 114 * flags: flags for open() call | |
| 115 * | |
| 116 * If fname != NULL and file cannot be opened, fail. | |
| 117 * | |
| 118 * return value: identifier for this memory block file. | |
| 119 */ | |
| 120 memfile_T * | |
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121 mf_open(char_u *fname, int flags) |
| 7 | 122 { |
| 123 memfile_T *mfp; | |
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124 off_T size; |
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125 #if defined(STATFS) && defined(UNIX) && !defined(__QNX__) && !defined(__minix) |
| 7 | 126 # define USE_FSTATFS |
| 127 struct STATFS stf; | |
| 128 #endif | |
| 129 | |
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130 if ((mfp = ALLOC_ONE(memfile_T)) == NULL) |
| 7 | 131 return NULL; |
| 132 | |
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133 if (fname == NULL) // no file for this memfile, use memory only |
| 7 | 134 { |
| 135 mfp->mf_fname = NULL; | |
| 136 mfp->mf_ffname = NULL; | |
| 137 mfp->mf_fd = -1; | |
| 138 } | |
| 139 else | |
| 140 { | |
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141 mf_do_open(mfp, fname, flags); // try to open the file |
| 7 | 142 |
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143 // if the file cannot be opened, return here |
| 7 | 144 if (mfp->mf_fd < 0) |
| 145 { | |
| 146 vim_free(mfp); | |
| 147 return NULL; | |
| 148 } | |
| 149 } | |
| 150 | |
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151 mfp->mf_free_first = NULL; // free list is empty |
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152 mfp->mf_used_first = NULL; // used list is empty |
| 7 | 153 mfp->mf_used_last = NULL; |
| 154 mfp->mf_dirty = FALSE; | |
| 155 mfp->mf_used_count = 0; | |
| 2730 | 156 mf_hash_init(&mfp->mf_hash); |
| 157 mf_hash_init(&mfp->mf_trans); | |
| 7 | 158 mfp->mf_page_size = MEMFILE_PAGE_SIZE; |
| 2267 | 159 #ifdef FEAT_CRYPT |
| 160 mfp->mf_old_key = NULL; | |
| 161 #endif | |
| 7 | 162 |
| 163 #ifdef USE_FSTATFS | |
| 164 /* | |
| 165 * Try to set the page size equal to the block size of the device. | |
| 166 * Speeds up I/O a lot. | |
| 167 * When recovering, the actual block size will be retrieved from block 0 | |
| 168 * in ml_recover(). The size used here may be wrong, therefore | |
| 169 * mf_blocknr_max must be rounded up. | |
| 170 */ | |
| 171 if (mfp->mf_fd >= 0 | |
| 172 && fstatfs(mfp->mf_fd, &stf, sizeof(struct statfs), 0) == 0 | |
| 173 && stf.F_BSIZE >= MIN_SWAP_PAGE_SIZE | |
| 174 && stf.F_BSIZE <= MAX_SWAP_PAGE_SIZE) | |
| 175 mfp->mf_page_size = stf.F_BSIZE; | |
| 176 #endif | |
| 177 | |
| 178 if (mfp->mf_fd < 0 || (flags & (O_TRUNC|O_EXCL)) | |
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179 || (size = vim_lseek(mfp->mf_fd, (off_T)0L, SEEK_END)) <= 0) |
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180 mfp->mf_blocknr_max = 0; // no file or empty file |
| 7 | 181 else |
| 182 mfp->mf_blocknr_max = (blocknr_T)((size + mfp->mf_page_size - 1) | |
| 183 / mfp->mf_page_size); | |
| 184 mfp->mf_blocknr_min = -1; | |
| 185 mfp->mf_neg_count = 0; | |
| 186 mfp->mf_infile_count = mfp->mf_blocknr_max; | |
| 1230 | 187 |
| 188 /* | |
| 189 * Compute maximum number of pages ('maxmem' is in Kbyte): | |
| 190 * 'mammem' * 1Kbyte / page-size-in-bytes. | |
| 191 * Avoid overflow by first reducing page size as much as possible. | |
| 192 */ | |
| 193 { | |
| 194 int shift = 10; | |
| 195 unsigned page_size = mfp->mf_page_size; | |
| 196 | |
| 197 while (shift > 0 && (page_size & 1) == 0) | |
| 198 { | |
| 199 page_size = page_size >> 1; | |
| 200 --shift; | |
| 201 } | |
| 202 mfp->mf_used_count_max = (p_mm << shift) / page_size; | |
| 203 if (mfp->mf_used_count_max < 10) | |
| 204 mfp->mf_used_count_max = 10; | |
| 205 } | |
| 7 | 206 |
| 207 return mfp; | |
| 208 } | |
| 209 | |
| 210 /* | |
| 211 * Open a file for an existing memfile. Used when updatecount set from 0 to | |
| 212 * some value. | |
| 213 * If the file already exists, this fails. | |
| 214 * "fname" is the name of file to use (NULL means no file at all) | |
| 215 * Note: "fname" must have been allocated, it is not copied! If opening the | |
| 216 * file fails, "fname" is freed. | |
| 217 * | |
| 218 * return value: FAIL if file could not be opened, OK otherwise | |
| 219 */ | |
| 220 int | |
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221 mf_open_file(memfile_T *mfp, char_u *fname) |
| 7 | 222 { |
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223 mf_do_open(mfp, fname, O_RDWR|O_CREAT|O_EXCL); // try to open the file |
| 7 | 224 |
| 225 if (mfp->mf_fd < 0) | |
| 226 return FAIL; | |
| 227 | |
| 228 mfp->mf_dirty = TRUE; | |
| 229 return OK; | |
| 230 } | |
| 231 | |
| 232 /* | |
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233 * Close a memory file and delete the associated file if 'del_file' is TRUE. |
| 7 | 234 */ |
| 235 void | |
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236 mf_close(memfile_T *mfp, int del_file) |
| 7 | 237 { |
| 238 bhdr_T *hp, *nextp; | |
| 239 | |
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240 if (mfp == NULL) // safety check |
| 7 | 241 return; |
| 242 if (mfp->mf_fd >= 0) | |
| 243 { | |
| 244 if (close(mfp->mf_fd) < 0) | |
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245 emsg(_(e_swapclose)); |
| 7 | 246 } |
| 247 if (del_file && mfp->mf_fname != NULL) | |
| 248 mch_remove(mfp->mf_fname); | |
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249 // free entries in used list |
| 7 | 250 for (hp = mfp->mf_used_first; hp != NULL; hp = nextp) |
| 251 { | |
| 252 total_mem_used -= hp->bh_page_count * mfp->mf_page_size; | |
| 253 nextp = hp->bh_next; | |
| 254 mf_free_bhdr(hp); | |
| 255 } | |
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256 while (mfp->mf_free_first != NULL) // free entries in free list |
| 7 | 257 vim_free(mf_rem_free(mfp)); |
| 2730 | 258 mf_hash_free(&mfp->mf_hash); |
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259 mf_hash_free_all(&mfp->mf_trans); // free hashtable and its items |
| 7 | 260 vim_free(mfp->mf_fname); |
| 261 vim_free(mfp->mf_ffname); | |
| 262 vim_free(mfp); | |
| 263 } | |
| 264 | |
| 265 /* | |
| 266 * Close the swap file for a memfile. Used when 'swapfile' is reset. | |
| 267 */ | |
| 268 void | |
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269 mf_close_file( |
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270 buf_T *buf, |
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271 int getlines) // get all lines into memory? |
| 7 | 272 { |
| 273 memfile_T *mfp; | |
| 274 linenr_T lnum; | |
| 275 | |
| 276 mfp = buf->b_ml.ml_mfp; | |
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277 if (mfp == NULL || mfp->mf_fd < 0) // nothing to close |
| 7 | 278 return; |
| 279 | |
| 280 if (getlines) | |
| 281 { | |
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282 // get all blocks in memory by accessing all lines (clumsy!) |
| 1066 | 283 mf_dont_release = TRUE; |
| 7 | 284 for (lnum = 1; lnum <= buf->b_ml.ml_line_count; ++lnum) |
| 285 (void)ml_get_buf(buf, lnum, FALSE); | |
| 1066 | 286 mf_dont_release = FALSE; |
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287 // TODO: should check if all blocks are really in core |
| 7 | 288 } |
| 289 | |
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290 if (close(mfp->mf_fd) < 0) // close the file |
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291 emsg(_(e_swapclose)); |
| 7 | 292 mfp->mf_fd = -1; |
| 293 | |
| 294 if (mfp->mf_fname != NULL) | |
| 295 { | |
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296 mch_remove(mfp->mf_fname); // delete the swap file |
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297 VIM_CLEAR(mfp->mf_fname); |
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298 VIM_CLEAR(mfp->mf_ffname); |
| 7 | 299 } |
| 300 } | |
| 301 | |
| 302 /* | |
| 303 * Set new size for a memfile. Used when block 0 of a swapfile has been read | |
| 304 * and the size it indicates differs from what was guessed. | |
| 305 */ | |
| 306 void | |
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307 mf_new_page_size(memfile_T *mfp, unsigned new_size) |
| 7 | 308 { |
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309 // Correct the memory used for block 0 to the new size, because it will be |
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310 // freed with that size later on. |
| 7 | 311 total_mem_used += new_size - mfp->mf_page_size; |
| 312 mfp->mf_page_size = new_size; | |
| 313 } | |
| 314 | |
| 315 /* | |
| 316 * get a new block | |
| 317 * | |
| 318 * negative: TRUE if negative block number desired (data block) | |
| 319 */ | |
| 320 bhdr_T * | |
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321 mf_new(memfile_T *mfp, int negative, int page_count) |
| 7 | 322 { |
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323 bhdr_T *hp; // new bhdr_T |
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324 bhdr_T *freep; // first block in free list |
| 1166 | 325 char_u *p; |
| 7 | 326 |
| 327 /* | |
| 328 * If we reached the maximum size for the used memory blocks, release one | |
| 329 * If a bhdr_T is returned, use it and adjust the page_count if necessary. | |
| 330 */ | |
| 331 hp = mf_release(mfp, page_count); | |
| 332 | |
| 333 /* | |
| 334 * Decide on the number to use: | |
| 335 * If there is a free block, use its number. | |
| 336 * Otherwise use mf_block_min for a negative number, mf_block_max for | |
| 337 * a positive number. | |
| 338 */ | |
| 339 freep = mfp->mf_free_first; | |
| 340 if (!negative && freep != NULL && freep->bh_page_count >= page_count) | |
| 341 { | |
| 342 /* | |
| 343 * If the block in the free list has more pages, take only the number | |
| 344 * of pages needed and allocate a new bhdr_T with data | |
| 345 * | |
| 1166 | 346 * If the number of pages matches and mf_release() did not return a |
| 347 * bhdr_T, use the bhdr_T from the free list and allocate the data | |
| 7 | 348 * |
| 1166 | 349 * If the number of pages matches and mf_release() returned a bhdr_T, |
| 7 | 350 * just use the number and free the bhdr_T from the free list |
| 351 */ | |
| 352 if (freep->bh_page_count > page_count) | |
| 353 { | |
| 354 if (hp == NULL && (hp = mf_alloc_bhdr(mfp, page_count)) == NULL) | |
| 355 return NULL; | |
| 356 hp->bh_bnum = freep->bh_bnum; | |
| 357 freep->bh_bnum += page_count; | |
| 358 freep->bh_page_count -= page_count; | |
| 359 } | |
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360 else if (hp == NULL) // need to allocate memory for this block |
| 7 | 361 { |
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362 if ((p = alloc(mfp->mf_page_size * page_count)) == NULL) |
| 7 | 363 return NULL; |
| 364 hp = mf_rem_free(mfp); | |
| 365 hp->bh_data = p; | |
| 366 } | |
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367 else // use the number, remove entry from free list |
| 7 | 368 { |
| 369 freep = mf_rem_free(mfp); | |
| 370 hp->bh_bnum = freep->bh_bnum; | |
| 371 vim_free(freep); | |
| 372 } | |
| 373 } | |
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374 else // get a new number |
| 7 | 375 { |
| 376 if (hp == NULL && (hp = mf_alloc_bhdr(mfp, page_count)) == NULL) | |
| 377 return NULL; | |
| 378 if (negative) | |
| 379 { | |
| 380 hp->bh_bnum = mfp->mf_blocknr_min--; | |
| 381 mfp->mf_neg_count++; | |
| 382 } | |
| 383 else | |
| 384 { | |
| 385 hp->bh_bnum = mfp->mf_blocknr_max; | |
| 386 mfp->mf_blocknr_max += page_count; | |
| 387 } | |
| 388 } | |
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389 hp->bh_flags = BH_LOCKED | BH_DIRTY; // new block is always dirty |
| 7 | 390 mfp->mf_dirty = TRUE; |
| 391 hp->bh_page_count = page_count; | |
| 392 mf_ins_used(mfp, hp); | |
| 393 mf_ins_hash(mfp, hp); | |
| 394 | |
| 395 /* | |
| 396 * Init the data to all zero, to avoid reading uninitialized data. | |
| 397 * This also avoids that the passwd file ends up in the swap file! | |
| 398 */ | |
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399 (void)vim_memset((char *)(hp->bh_data), 0, |
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400 (size_t)mfp->mf_page_size * page_count); |
| 7 | 401 |
| 402 return hp; | |
| 403 } | |
| 404 | |
| 405 /* | |
| 2267 | 406 * Get existing block "nr" with "page_count" pages. |
| 7 | 407 * |
| 408 * Note: The caller should first check a negative nr with mf_trans_del() | |
| 409 */ | |
| 410 bhdr_T * | |
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411 mf_get(memfile_T *mfp, blocknr_T nr, int page_count) |
| 7 | 412 { |
| 413 bhdr_T *hp; | |
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414 // doesn't exist |
| 7 | 415 if (nr >= mfp->mf_blocknr_max || nr <= mfp->mf_blocknr_min) |
| 416 return NULL; | |
| 417 | |
| 418 /* | |
| 419 * see if it is in the cache | |
| 420 */ | |
| 421 hp = mf_find_hash(mfp, nr); | |
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422 if (hp == NULL) // not in the hash list |
| 7 | 423 { |
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424 if (nr < 0 || nr >= mfp->mf_infile_count) // can't be in the file |
| 7 | 425 return NULL; |
| 426 | |
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427 // could check here if the block is in the free list |
| 7 | 428 |
| 429 /* | |
| 430 * Check if we need to flush an existing block. | |
| 431 * If so, use that block. | |
| 432 * If not, allocate a new block. | |
| 433 */ | |
| 434 hp = mf_release(mfp, page_count); | |
| 435 if (hp == NULL && (hp = mf_alloc_bhdr(mfp, page_count)) == NULL) | |
| 436 return NULL; | |
| 437 | |
| 438 hp->bh_bnum = nr; | |
| 439 hp->bh_flags = 0; | |
| 440 hp->bh_page_count = page_count; | |
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441 if (mf_read(mfp, hp) == FAIL) // cannot read the block! |
| 7 | 442 { |
| 443 mf_free_bhdr(hp); | |
| 444 return NULL; | |
| 445 } | |
| 446 } | |
| 447 else | |
| 448 { | |
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449 mf_rem_used(mfp, hp); // remove from list, insert in front below |
| 7 | 450 mf_rem_hash(mfp, hp); |
| 451 } | |
| 452 | |
| 453 hp->bh_flags |= BH_LOCKED; | |
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454 mf_ins_used(mfp, hp); // put in front of used list |
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455 mf_ins_hash(mfp, hp); // put in front of hash list |
| 7 | 456 |
| 457 return hp; | |
| 458 } | |
| 459 | |
| 460 /* | |
| 461 * release the block *hp | |
| 462 * | |
| 463 * dirty: Block must be written to file later | |
| 464 * infile: Block should be in file (needed for recovery) | |
| 465 * | |
| 466 * no return value, function cannot fail | |
| 467 */ | |
| 468 void | |
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469 mf_put( |
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470 memfile_T *mfp, |
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471 bhdr_T *hp, |
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472 int dirty, |
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473 int infile) |
| 7 | 474 { |
| 475 int flags; | |
| 476 | |
| 477 flags = hp->bh_flags; | |
| 478 | |
| 479 if ((flags & BH_LOCKED) == 0) | |
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480 iemsg(_("E293: block was not locked")); |
| 7 | 481 flags &= ~BH_LOCKED; |
| 482 if (dirty) | |
| 483 { | |
| 484 flags |= BH_DIRTY; | |
| 485 mfp->mf_dirty = TRUE; | |
| 486 } | |
| 487 hp->bh_flags = flags; | |
| 488 if (infile) | |
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489 mf_trans_add(mfp, hp); // may translate negative in positive nr |
| 7 | 490 } |
| 491 | |
| 492 /* | |
| 493 * block *hp is no longer in used, may put it in the free list of memfile *mfp | |
| 494 */ | |
| 495 void | |
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496 mf_free(memfile_T *mfp, bhdr_T *hp) |
| 7 | 497 { |
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498 vim_free(hp->bh_data); // free the memory |
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499 mf_rem_hash(mfp, hp); // get *hp out of the hash list |
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500 mf_rem_used(mfp, hp); // get *hp out of the used list |
| 7 | 501 if (hp->bh_bnum < 0) |
| 502 { | |
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503 vim_free(hp); // don't want negative numbers in free list |
| 7 | 504 mfp->mf_neg_count--; |
| 505 } | |
| 506 else | |
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507 mf_ins_free(mfp, hp); // put *hp in the free list |
| 7 | 508 } |
| 509 | |
| 984 | 510 #if defined(__MORPHOS__) && defined(__libnix__) |
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511 // function is missing in MorphOS libnix version |
| 7 | 512 extern unsigned long *__stdfiledes; |
| 513 | |
| 514 static unsigned long | |
| 515 fdtofh(int filedescriptor) | |
| 516 { | |
| 517 return __stdfiledes[filedescriptor]; | |
| 518 } | |
| 519 #endif | |
| 520 | |
| 521 /* | |
| 522 * Sync the memory file *mfp to disk. | |
| 523 * Flags: | |
| 524 * MFS_ALL If not given, blocks with negative numbers are not synced, | |
| 525 * even when they are dirty! | |
| 526 * MFS_STOP Stop syncing when a character becomes available, but sync at | |
| 527 * least one block. | |
| 528 * MFS_FLUSH Make sure buffers are flushed to disk, so they will survive a | |
| 529 * system crash. | |
| 530 * MFS_ZERO Only write block 0. | |
| 531 * | |
| 532 * Return FAIL for failure, OK otherwise | |
| 533 */ | |
| 534 int | |
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535 mf_sync(memfile_T *mfp, int flags) |
| 7 | 536 { |
| 537 int status; | |
| 538 bhdr_T *hp; | |
| 539 int got_int_save = got_int; | |
| 540 | |
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541 if (mfp->mf_fd < 0) // there is no file, nothing to do |
| 7 | 542 { |
| 543 mfp->mf_dirty = FALSE; | |
| 544 return FAIL; | |
| 545 } | |
| 546 | |
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547 // Only a CTRL-C while writing will break us here, not one typed |
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548 // previously. |
| 7 | 549 got_int = FALSE; |
| 550 | |
| 551 /* | |
| 552 * sync from last to first (may reduce the probability of an inconsistent | |
| 553 * file) If a write fails, it is very likely caused by a full filesystem. | |
| 554 * Then we only try to write blocks within the existing file. If that also | |
| 555 * fails then we give up. | |
| 556 */ | |
| 557 status = OK; | |
| 558 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev) | |
| 559 if (((flags & MFS_ALL) || hp->bh_bnum >= 0) | |
| 560 && (hp->bh_flags & BH_DIRTY) | |
| 561 && (status == OK || (hp->bh_bnum >= 0 | |
| 562 && hp->bh_bnum < mfp->mf_infile_count))) | |
| 563 { | |
| 564 if ((flags & MFS_ZERO) && hp->bh_bnum != 0) | |
| 565 continue; | |
| 566 if (mf_write(mfp, hp) == FAIL) | |
| 567 { | |
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568 if (status == FAIL) // double error: quit syncing |
| 7 | 569 break; |
| 570 status = FAIL; | |
| 571 } | |
| 572 if (flags & MFS_STOP) | |
| 573 { | |
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574 // Stop when char available now. |
| 7 | 575 if (ui_char_avail()) |
| 576 break; | |
| 577 } | |
| 578 else | |
| 579 ui_breakcheck(); | |
| 580 if (got_int) | |
| 581 break; | |
| 582 } | |
| 583 | |
| 584 /* | |
| 585 * If the whole list is flushed, the memfile is not dirty anymore. | |
| 586 * In case of an error this flag is also set, to avoid trying all the time. | |
| 587 */ | |
| 588 if (hp == NULL || status == FAIL) | |
| 589 mfp->mf_dirty = FALSE; | |
| 590 | |
| 591 if ((flags & MFS_FLUSH) && *p_sws != NUL) | |
| 592 { | |
| 593 #if defined(UNIX) | |
| 594 # ifdef HAVE_FSYNC | |
| 595 /* | |
| 596 * most Unixes have the very useful fsync() function, just what we need. | |
| 597 */ | |
| 598 if (STRCMP(p_sws, "fsync") == 0) | |
| 599 { | |
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600 if (vim_fsync(mfp->mf_fd)) |
| 7 | 601 status = FAIL; |
| 602 } | |
| 603 else | |
| 604 # endif | |
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605 // OpenNT is strictly POSIX (Benzinger) |
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606 // Tandem/Himalaya NSK-OSS doesn't have sync() |
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607 // No sync() on Stratus VOS |
| 6637 | 608 # if defined(__OPENNT) || defined(__TANDEM) || defined(__VOS__) |
| 7 | 609 fflush(NULL); |
| 610 # else | |
| 611 sync(); | |
| 612 # endif | |
| 613 #endif | |
| 614 #ifdef VMS | |
| 615 if (STRCMP(p_sws, "fsync") == 0) | |
| 616 { | |
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617 if (vim_fsync(mfp->mf_fd)) |
| 7 | 618 status = FAIL; |
| 619 } | |
| 620 #endif | |
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621 #ifdef MSWIN |
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622 if (_commit(mfp->mf_fd)) |
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623 status = FAIL; |
| 7 | 624 #endif |
| 625 #ifdef AMIGA | |
| 1030 | 626 # if defined(__AROS__) || defined(__amigaos4__) |
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627 if (vim_fsync(mfp->mf_fd) != 0) |
| 7 | 628 status = FAIL; |
| 629 # else | |
| 630 /* | |
| 631 * Flush() only exists for AmigaDos 2.0. | |
| 632 * For 1.3 it should be done with close() + open(), but then the risk | |
| 633 * is that the open() may fail and lose the file.... | |
| 634 */ | |
| 635 # ifdef FEAT_ARP | |
| 636 if (dos2) | |
| 637 # endif | |
| 638 # ifdef SASC | |
| 639 { | |
| 640 struct UFB *fp = chkufb(mfp->mf_fd); | |
| 641 | |
| 642 if (fp != NULL) | |
| 643 Flush(fp->ufbfh); | |
| 644 } | |
| 645 # else | |
| 646 # if defined(_DCC) || defined(__GNUC__) || defined(__MORPHOS__) | |
| 647 { | |
| 984 | 648 # if defined(__GNUC__) && !defined(__MORPHOS__) && defined(__libnix__) |
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649 // Have function (in libnix at least), |
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650 // but ain't got no prototype anywhere. |
| 7 | 651 extern unsigned long fdtofh(int filedescriptor); |
| 652 # endif | |
| 984 | 653 # if !defined(__libnix__) |
| 654 fflush(NULL); | |
| 655 # else | |
| 7 | 656 BPTR fh = (BPTR)fdtofh(mfp->mf_fd); |
| 657 | |
| 658 if (fh != 0) | |
| 659 Flush(fh); | |
| 984 | 660 # endif |
| 7 | 661 } |
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662 # else // assume Manx |
| 7 | 663 Flush(_devtab[mfp->mf_fd].fd); |
| 664 # endif | |
| 665 # endif | |
| 666 # endif | |
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667 #endif // AMIGA |
| 7 | 668 } |
| 669 | |
| 670 got_int |= got_int_save; | |
| 671 | |
| 672 return status; | |
| 673 } | |
| 674 | |
| 675 /* | |
| 630 | 676 * For all blocks in memory file *mfp that have a positive block number set |
| 677 * the dirty flag. These are blocks that need to be written to a newly | |
| 678 * created swapfile. | |
| 679 */ | |
| 680 void | |
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681 mf_set_dirty(memfile_T *mfp) |
| 630 | 682 { |
| 683 bhdr_T *hp; | |
| 684 | |
| 685 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev) | |
| 686 if (hp->bh_bnum > 0) | |
| 687 hp->bh_flags |= BH_DIRTY; | |
| 688 mfp->mf_dirty = TRUE; | |
| 689 } | |
| 690 | |
| 691 /* | |
| 7 | 692 * insert block *hp in front of hashlist of memfile *mfp |
| 693 */ | |
| 694 static void | |
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695 mf_ins_hash(memfile_T *mfp, bhdr_T *hp) |
| 7 | 696 { |
| 2730 | 697 mf_hash_add_item(&mfp->mf_hash, (mf_hashitem_T *)hp); |
| 7 | 698 } |
| 699 | |
| 700 /* | |
| 701 * remove block *hp from hashlist of memfile list *mfp | |
| 702 */ | |
| 703 static void | |
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704 mf_rem_hash(memfile_T *mfp, bhdr_T *hp) |
| 7 | 705 { |
| 2730 | 706 mf_hash_rem_item(&mfp->mf_hash, (mf_hashitem_T *)hp); |
| 7 | 707 } |
| 708 | |
| 709 /* | |
| 710 * look in hash lists of memfile *mfp for block header with number 'nr' | |
| 711 */ | |
| 712 static bhdr_T * | |
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713 mf_find_hash(memfile_T *mfp, blocknr_T nr) |
| 7 | 714 { |
| 2730 | 715 return (bhdr_T *)mf_hash_find(&mfp->mf_hash, nr); |
| 7 | 716 } |
| 717 | |
| 718 /* | |
| 719 * insert block *hp in front of used list of memfile *mfp | |
| 720 */ | |
| 721 static void | |
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722 mf_ins_used(memfile_T *mfp, bhdr_T *hp) |
| 7 | 723 { |
| 724 hp->bh_next = mfp->mf_used_first; | |
| 725 mfp->mf_used_first = hp; | |
| 726 hp->bh_prev = NULL; | |
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727 if (hp->bh_next == NULL) // list was empty, adjust last pointer |
| 7 | 728 mfp->mf_used_last = hp; |
| 729 else | |
| 730 hp->bh_next->bh_prev = hp; | |
| 731 mfp->mf_used_count += hp->bh_page_count; | |
| 732 total_mem_used += hp->bh_page_count * mfp->mf_page_size; | |
| 733 } | |
| 734 | |
| 735 /* | |
| 736 * remove block *hp from used list of memfile *mfp | |
| 737 */ | |
| 738 static void | |
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739 mf_rem_used(memfile_T *mfp, bhdr_T *hp) |
| 7 | 740 { |
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741 if (hp->bh_next == NULL) // last block in used list |
| 7 | 742 mfp->mf_used_last = hp->bh_prev; |
| 743 else | |
| 744 hp->bh_next->bh_prev = hp->bh_prev; | |
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745 if (hp->bh_prev == NULL) // first block in used list |
| 7 | 746 mfp->mf_used_first = hp->bh_next; |
| 747 else | |
| 748 hp->bh_prev->bh_next = hp->bh_next; | |
| 749 mfp->mf_used_count -= hp->bh_page_count; | |
| 750 total_mem_used -= hp->bh_page_count * mfp->mf_page_size; | |
| 751 } | |
| 752 | |
| 753 /* | |
| 754 * Release the least recently used block from the used list if the number | |
| 755 * of used memory blocks gets to big. | |
| 756 * | |
| 757 * Return the block header to the caller, including the memory block, so | |
| 758 * it can be re-used. Make sure the page_count is right. | |
| 6817 | 759 * |
| 760 * Returns NULL if no block is released. | |
| 7 | 761 */ |
| 762 static bhdr_T * | |
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763 mf_release(memfile_T *mfp, int page_count) |
| 7 | 764 { |
| 765 bhdr_T *hp; | |
| 766 int need_release; | |
| 767 buf_T *buf; | |
| 768 | |
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769 // don't release while in mf_close_file() |
| 1066 | 770 if (mf_dont_release) |
| 7 | 771 return NULL; |
| 772 | |
| 773 /* | |
| 774 * Need to release a block if the number of blocks for this memfile is | |
| 775 * higher than the maximum or total memory used is over 'maxmemtot' | |
| 776 */ | |
| 777 need_release = ((mfp->mf_used_count >= mfp->mf_used_count_max) | |
| 778 || (total_mem_used >> 10) >= (long_u)p_mmt); | |
| 779 | |
| 780 /* | |
| 781 * Try to create a swap file if the amount of memory used is getting too | |
| 782 * high. | |
| 783 */ | |
| 784 if (mfp->mf_fd < 0 && need_release && p_uc) | |
| 785 { | |
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786 // find for which buffer this memfile is |
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787 FOR_ALL_BUFFERS(buf) |
| 7 | 788 if (buf->b_ml.ml_mfp == mfp) |
| 789 break; | |
| 790 if (buf != NULL && buf->b_may_swap) | |
| 791 ml_open_file(buf); | |
| 792 } | |
| 793 | |
| 794 /* | |
| 795 * don't release a block if | |
| 796 * there is no file for this memfile | |
| 797 * or | |
| 798 * the number of blocks for this memfile is lower than the maximum | |
| 799 * and | |
| 800 * total memory used is not up to 'maxmemtot' | |
| 801 */ | |
| 802 if (mfp->mf_fd < 0 || !need_release) | |
| 803 return NULL; | |
| 804 | |
| 805 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev) | |
| 806 if (!(hp->bh_flags & BH_LOCKED)) | |
| 807 break; | |
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808 if (hp == NULL) // not a single one that can be released |
| 7 | 809 return NULL; |
| 810 | |
| 811 /* | |
| 812 * If the block is dirty, write it. | |
| 813 * If the write fails we don't free it. | |
| 814 */ | |
| 815 if ((hp->bh_flags & BH_DIRTY) && mf_write(mfp, hp) == FAIL) | |
| 816 return NULL; | |
| 817 | |
| 818 mf_rem_used(mfp, hp); | |
| 819 mf_rem_hash(mfp, hp); | |
| 820 | |
| 821 /* | |
| 822 * If a bhdr_T is returned, make sure that the page_count of bh_data is | |
| 823 * right | |
| 824 */ | |
| 825 if (hp->bh_page_count != page_count) | |
| 826 { | |
| 827 vim_free(hp->bh_data); | |
| 828 if ((hp->bh_data = alloc(mfp->mf_page_size * page_count)) == NULL) | |
| 829 { | |
| 830 vim_free(hp); | |
| 831 return NULL; | |
| 832 } | |
| 833 hp->bh_page_count = page_count; | |
| 834 } | |
| 835 return hp; | |
| 836 } | |
| 837 | |
| 838 /* | |
| 839 * release as many blocks as possible | |
| 840 * Used in case of out of memory | |
| 841 * | |
| 842 * return TRUE if any memory was released | |
| 843 */ | |
| 844 int | |
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845 mf_release_all(void) |
| 7 | 846 { |
| 847 buf_T *buf; | |
| 848 memfile_T *mfp; | |
| 849 bhdr_T *hp; | |
| 850 int retval = FALSE; | |
| 851 | |
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852 FOR_ALL_BUFFERS(buf) |
| 7 | 853 { |
| 854 mfp = buf->b_ml.ml_mfp; | |
| 855 if (mfp != NULL) | |
| 856 { | |
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857 // If no swap file yet, may open one |
| 7 | 858 if (mfp->mf_fd < 0 && buf->b_may_swap) |
| 859 ml_open_file(buf); | |
| 860 | |
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861 // only if there is a swapfile |
| 7 | 862 if (mfp->mf_fd >= 0) |
| 863 { | |
| 864 for (hp = mfp->mf_used_last; hp != NULL; ) | |
| 865 { | |
| 866 if (!(hp->bh_flags & BH_LOCKED) | |
| 867 && (!(hp->bh_flags & BH_DIRTY) | |
| 868 || mf_write(mfp, hp) != FAIL)) | |
| 869 { | |
| 870 mf_rem_used(mfp, hp); | |
| 871 mf_rem_hash(mfp, hp); | |
| 872 mf_free_bhdr(hp); | |
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873 hp = mfp->mf_used_last; // re-start, list was changed |
| 7 | 874 retval = TRUE; |
| 875 } | |
| 876 else | |
| 877 hp = hp->bh_prev; | |
| 878 } | |
| 879 } | |
| 880 } | |
| 881 } | |
| 882 return retval; | |
| 883 } | |
| 884 | |
| 885 /* | |
| 886 * Allocate a block header and a block of memory for it | |
| 887 */ | |
| 888 static bhdr_T * | |
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889 mf_alloc_bhdr(memfile_T *mfp, int page_count) |
| 7 | 890 { |
| 891 bhdr_T *hp; | |
| 892 | |
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893 if ((hp = ALLOC_ONE(bhdr_T)) != NULL) |
| 7 | 894 { |
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895 if ((hp->bh_data = alloc(mfp->mf_page_size * page_count)) == NULL) |
| 7 | 896 { |
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897 vim_free(hp); // not enough memory |
| 7 | 898 return NULL; |
| 899 } | |
| 900 hp->bh_page_count = page_count; | |
| 901 } | |
| 902 return hp; | |
| 903 } | |
| 904 | |
| 905 /* | |
| 906 * Free a block header and the block of memory for it | |
| 907 */ | |
| 908 static void | |
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909 mf_free_bhdr(bhdr_T *hp) |
| 7 | 910 { |
| 911 vim_free(hp->bh_data); | |
| 912 vim_free(hp); | |
| 913 } | |
| 914 | |
| 915 /* | |
| 916 * insert entry *hp in the free list | |
| 917 */ | |
| 918 static void | |
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919 mf_ins_free(memfile_T *mfp, bhdr_T *hp) |
| 7 | 920 { |
| 921 hp->bh_next = mfp->mf_free_first; | |
| 922 mfp->mf_free_first = hp; | |
| 923 } | |
| 924 | |
| 925 /* | |
| 926 * remove the first entry from the free list and return a pointer to it | |
| 927 * Note: caller must check that mfp->mf_free_first is not NULL! | |
| 928 */ | |
| 929 static bhdr_T * | |
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930 mf_rem_free(memfile_T *mfp) |
| 7 | 931 { |
| 932 bhdr_T *hp; | |
| 933 | |
| 934 hp = mfp->mf_free_first; | |
| 935 mfp->mf_free_first = hp->bh_next; | |
| 936 return hp; | |
| 937 } | |
| 938 | |
| 939 /* | |
| 940 * read a block from disk | |
| 941 * | |
| 942 * Return FAIL for failure, OK otherwise | |
| 943 */ | |
| 944 static int | |
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945 mf_read(memfile_T *mfp, bhdr_T *hp) |
| 7 | 946 { |
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947 off_T offset; |
| 7 | 948 unsigned page_size; |
| 949 unsigned size; | |
| 950 | |
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951 if (mfp->mf_fd < 0) // there is no file, can't read |
| 7 | 952 return FAIL; |
| 953 | |
| 954 page_size = mfp->mf_page_size; | |
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955 offset = (off_T)page_size * hp->bh_bnum; |
| 7 | 956 size = page_size * hp->bh_page_count; |
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957 if (vim_lseek(mfp->mf_fd, offset, SEEK_SET) != offset) |
| 7 | 958 { |
| 1033 | 959 PERROR(_("E294: Seek error in swap file read")); |
| 7 | 960 return FAIL; |
| 961 } | |
| 2664 | 962 if ((unsigned)read_eintr(mfp->mf_fd, hp->bh_data, size) != size) |
| 7 | 963 { |
| 1033 | 964 PERROR(_("E295: Read error in swap file")); |
| 7 | 965 return FAIL; |
| 966 } | |
| 2267 | 967 |
| 968 #ifdef FEAT_CRYPT | |
|
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969 // Decrypt if 'key' is set and this is a data block. And when changing the |
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970 // key. |
|
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971 if (*mfp->mf_buffer->b_p_key != NUL || mfp->mf_old_key != NULL) |
| 2267 | 972 ml_decrypt_data(mfp, hp->bh_data, offset, size); |
| 973 #endif | |
| 974 | |
| 7 | 975 return OK; |
| 976 } | |
| 977 | |
| 978 /* | |
| 979 * write a block to disk | |
| 980 * | |
| 981 * Return FAIL for failure, OK otherwise | |
| 982 */ | |
| 983 static int | |
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984 mf_write(memfile_T *mfp, bhdr_T *hp) |
| 7 | 985 { |
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986 off_T offset; // offset in the file |
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987 blocknr_T nr; // block nr which is being written |
| 7 | 988 bhdr_T *hp2; |
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989 unsigned page_size; // number of bytes in a page |
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990 unsigned page_count; // number of pages written |
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991 unsigned size; // number of bytes written |
| 7 | 992 |
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993 if (mfp->mf_fd < 0 && !mfp->mf_reopen) |
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994 // there is no file and there was no file, can't write |
| 7 | 995 return FAIL; |
| 996 | |
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997 if (hp->bh_bnum < 0) // must assign file block number |
| 7 | 998 if (mf_trans_add(mfp, hp) == FAIL) |
| 999 return FAIL; | |
| 1000 | |
| 1001 page_size = mfp->mf_page_size; | |
| 1002 | |
| 1003 /* | |
| 1004 * We don't want gaps in the file. Write the blocks in front of *hp | |
| 1005 * to extend the file. | |
| 1006 * If block 'mf_infile_count' is not in the hash list, it has been | |
| 1007 * freed. Fill the space in the file with data from the current block. | |
| 1008 */ | |
| 1009 for (;;) | |
| 1010 { | |
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1011 int attempt; |
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1012 |
| 7 | 1013 nr = hp->bh_bnum; |
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1014 if (nr > mfp->mf_infile_count) // beyond end of file |
| 7 | 1015 { |
| 1016 nr = mfp->mf_infile_count; | |
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1017 hp2 = mf_find_hash(mfp, nr); // NULL caught below |
| 7 | 1018 } |
| 1019 else | |
| 1020 hp2 = hp; | |
| 1021 | |
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1022 offset = (off_T)page_size * nr; |
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1023 if (hp2 == NULL) // freed block, fill with dummy data |
| 7 | 1024 page_count = 1; |
| 1025 else | |
| 1026 page_count = hp2->bh_page_count; | |
| 1027 size = page_size * page_count; | |
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1028 |
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1029 for (attempt = 1; attempt <= 2; ++attempt) |
| 7 | 1030 { |
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1031 if (mfp->mf_fd >= 0) |
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1032 { |
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1033 if (vim_lseek(mfp->mf_fd, offset, SEEK_SET) != offset) |
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1034 { |
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1035 PERROR(_("E296: Seek error in swap file write")); |
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1036 return FAIL; |
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1037 } |
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1038 if (mf_write_block(mfp, |
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1039 hp2 == NULL ? hp : hp2, offset, size) == OK) |
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1040 break; |
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1041 } |
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1042 |
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1043 if (attempt == 1) |
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1044 { |
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1045 // If the swap file is on a network drive, and the network |
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1046 // gets disconnected and then re-connected, we can maybe fix it |
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1047 // by closing and then re-opening the file. |
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1048 if (mfp->mf_fd >= 0) |
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1049 close(mfp->mf_fd); |
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1050 mfp->mf_fd = mch_open_rw((char *)mfp->mf_fname, mfp->mf_flags); |
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1051 mfp->mf_reopen = (mfp->mf_fd < 0); |
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1052 } |
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1053 if (attempt == 2 || mfp->mf_fd < 0) |
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1054 { |
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1055 // Avoid repeating the error message, this mostly happens when |
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1056 // the disk is full. We give the message again only after a |
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1057 // successful write or when hitting a key. We keep on trying, |
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1058 // in case some space becomes available. |
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1059 if (!did_swapwrite_msg) |
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1060 emsg(_("E297: Write error in swap file")); |
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1061 did_swapwrite_msg = TRUE; |
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1062 return FAIL; |
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1063 } |
| 7 | 1064 } |
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1065 |
| 7 | 1066 did_swapwrite_msg = FALSE; |
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1067 if (hp2 != NULL) // written a non-dummy block |
| 7 | 1068 hp2->bh_flags &= ~BH_DIRTY; |
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1069 // appended to the file |
| 7 | 1070 if (nr + (blocknr_T)page_count > mfp->mf_infile_count) |
| 1071 mfp->mf_infile_count = nr + page_count; | |
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1072 if (nr == hp->bh_bnum) // written the desired block |
| 7 | 1073 break; |
| 1074 } | |
| 1075 return OK; | |
| 1076 } | |
| 1077 | |
| 1078 /* | |
| 2267 | 1079 * Write block "hp" with data size "size" to file "mfp->mf_fd". |
| 1080 * Takes care of encryption. | |
| 1081 * Return FAIL or OK. | |
| 1082 */ | |
| 1083 static int | |
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1084 mf_write_block( |
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1085 memfile_T *mfp, |
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1086 bhdr_T *hp, |
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1087 off_T offset UNUSED, |
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1088 unsigned size) |
| 2267 | 1089 { |
| 1090 char_u *data = hp->bh_data; | |
| 1091 int result = OK; | |
| 1092 | |
| 1093 #ifdef FEAT_CRYPT | |
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1094 // Encrypt if 'key' is set and this is a data block. |
| 2267 | 1095 if (*mfp->mf_buffer->b_p_key != NUL) |
| 1096 { | |
| 1097 data = ml_encrypt_data(mfp, data, offset, size); | |
| 1098 if (data == NULL) | |
| 1099 return FAIL; | |
| 1100 } | |
| 1101 #endif | |
| 1102 | |
| 2664 | 1103 if ((unsigned)write_eintr(mfp->mf_fd, data, size) != size) |
| 2267 | 1104 result = FAIL; |
| 1105 | |
| 1106 #ifdef FEAT_CRYPT | |
| 1107 if (data != hp->bh_data) | |
| 1108 vim_free(data); | |
| 1109 #endif | |
| 1110 | |
| 1111 return result; | |
| 1112 } | |
| 1113 | |
| 1114 /* | |
| 7 | 1115 * Make block number for *hp positive and add it to the translation list |
| 1116 * | |
| 1117 * Return FAIL for failure, OK otherwise | |
| 1118 */ | |
| 1119 static int | |
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1120 mf_trans_add(memfile_T *mfp, bhdr_T *hp) |
| 7 | 1121 { |
| 1122 bhdr_T *freep; | |
| 1123 blocknr_T new_bnum; | |
| 1124 NR_TRANS *np; | |
| 1125 int page_count; | |
| 1126 | |
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1127 if (hp->bh_bnum >= 0) // it's already positive |
| 7 | 1128 return OK; |
| 1129 | |
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1130 if ((np = ALLOC_ONE(NR_TRANS)) == NULL) |
| 7 | 1131 return FAIL; |
| 1132 | |
| 1133 /* | |
| 2267 | 1134 * Get a new number for the block. |
| 7 | 1135 * If the first item in the free list has sufficient pages, use its number |
| 1136 * Otherwise use mf_blocknr_max. | |
| 1137 */ | |
| 1138 freep = mfp->mf_free_first; | |
| 1139 page_count = hp->bh_page_count; | |
| 1140 if (freep != NULL && freep->bh_page_count >= page_count) | |
| 1141 { | |
| 1142 new_bnum = freep->bh_bnum; | |
| 1143 /* | |
| 4352 | 1144 * If the page count of the free block was larger, reduce it. |
| 7 | 1145 * If the page count matches, remove the block from the free list |
| 1146 */ | |
| 1147 if (freep->bh_page_count > page_count) | |
| 1148 { | |
| 1149 freep->bh_bnum += page_count; | |
| 1150 freep->bh_page_count -= page_count; | |
| 1151 } | |
| 1152 else | |
| 1153 { | |
| 1154 freep = mf_rem_free(mfp); | |
| 1155 vim_free(freep); | |
| 1156 } | |
| 1157 } | |
| 1158 else | |
| 1159 { | |
| 1160 new_bnum = mfp->mf_blocknr_max; | |
| 1161 mfp->mf_blocknr_max += page_count; | |
| 1162 } | |
| 1163 | |
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1164 np->nt_old_bnum = hp->bh_bnum; // adjust number |
| 7 | 1165 np->nt_new_bnum = new_bnum; |
| 1166 | |
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1167 mf_rem_hash(mfp, hp); // remove from old hash list |
| 7 | 1168 hp->bh_bnum = new_bnum; |
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1169 mf_ins_hash(mfp, hp); // insert in new hash list |
| 7 | 1170 |
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1171 // Insert "np" into "mf_trans" hashtable with key "np->nt_old_bnum" |
| 2730 | 1172 mf_hash_add_item(&mfp->mf_trans, (mf_hashitem_T *)np); |
| 7 | 1173 |
| 1174 return OK; | |
| 1175 } | |
| 1176 | |
| 1177 /* | |
| 6817 | 1178 * Lookup a translation from the trans lists and delete the entry. |
| 7 | 1179 * |
| 1180 * Return the positive new number when found, the old number when not found | |
| 1181 */ | |
| 1182 blocknr_T | |
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1183 mf_trans_del(memfile_T *mfp, blocknr_T old_nr) |
| 7 | 1184 { |
| 1185 NR_TRANS *np; | |
| 1186 blocknr_T new_bnum; | |
| 1187 | |
| 2730 | 1188 np = (NR_TRANS *)mf_hash_find(&mfp->mf_trans, old_nr); |
| 1189 | |
|
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1190 if (np == NULL) // not found |
| 7 | 1191 return old_nr; |
| 1192 | |
| 1193 mfp->mf_neg_count--; | |
| 1194 new_bnum = np->nt_new_bnum; | |
| 2730 | 1195 |
|
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1196 // remove entry from the trans list |
| 2730 | 1197 mf_hash_rem_item(&mfp->mf_trans, (mf_hashitem_T *)np); |
| 1198 | |
| 7 | 1199 vim_free(np); |
| 1200 | |
| 1201 return new_bnum; | |
| 1202 } | |
| 1203 | |
| 1204 /* | |
| 1205 * Set mfp->mf_ffname according to mfp->mf_fname and some other things. | |
| 1206 * Only called when creating or renaming the swapfile. Either way it's a new | |
| 1207 * name so we must work out the full path name. | |
| 1208 */ | |
| 1209 void | |
|
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1210 mf_set_ffname(memfile_T *mfp) |
| 7 | 1211 { |
| 1212 mfp->mf_ffname = FullName_save(mfp->mf_fname, FALSE); | |
| 1213 } | |
| 1214 | |
| 1215 /* | |
| 1216 * Make the name of the file used for the memfile a full path. | |
| 1217 * Used before doing a :cd | |
| 1218 */ | |
| 1219 void | |
|
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1220 mf_fullname(memfile_T *mfp) |
| 7 | 1221 { |
| 1222 if (mfp != NULL && mfp->mf_fname != NULL && mfp->mf_ffname != NULL) | |
| 1223 { | |
| 1224 vim_free(mfp->mf_fname); | |
| 1225 mfp->mf_fname = mfp->mf_ffname; | |
| 1226 mfp->mf_ffname = NULL; | |
| 1227 } | |
| 1228 } | |
| 1229 | |
| 1230 /* | |
| 1231 * return TRUE if there are any translations pending for 'mfp' | |
| 1232 */ | |
| 1233 int | |
|
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1234 mf_need_trans(memfile_T *mfp) |
| 7 | 1235 { |
| 1236 return (mfp->mf_fname != NULL && mfp->mf_neg_count > 0); | |
| 1237 } | |
| 1238 | |
| 1239 /* | |
| 1240 * Open a swap file for a memfile. | |
| 1241 * The "fname" must be in allocated memory, and is consumed (also when an | |
| 1242 * error occurs). | |
| 1243 */ | |
| 1244 static void | |
|
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1245 mf_do_open( |
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1246 memfile_T *mfp, |
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1247 char_u *fname, |
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1248 int flags) // flags for open() |
| 7 | 1249 { |
| 1250 #ifdef HAVE_LSTAT | |
|
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1251 stat_T sb; |
| 7 | 1252 #endif |
| 1253 | |
| 1254 mfp->mf_fname = fname; | |
| 1255 | |
| 1256 /* | |
| 1257 * Get the full path name before the open, because this is | |
| 1258 * not possible after the open on the Amiga. | |
| 1259 * fname cannot be NameBuff, because it must have been allocated. | |
| 1260 */ | |
| 1261 mf_set_ffname(mfp); | |
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1262 #if defined(MSWIN) |
| 7 | 1263 /* |
| 4352 | 1264 * A ":!cd e:xxx" may change the directory without us knowing, use the |
| 7 | 1265 * full pathname always. Careful: This frees fname! |
| 1266 */ | |
| 1267 mf_fullname(mfp); | |
| 1268 #endif | |
| 1269 | |
| 1270 #ifdef HAVE_LSTAT | |
| 1271 /* | |
| 1272 * Extra security check: When creating a swap file it really shouldn't | |
| 1273 * exist yet. If there is a symbolic link, this is most likely an attack. | |
| 1274 */ | |
| 1275 if ((flags & O_CREAT) && mch_lstat((char *)mfp->mf_fname, &sb) >= 0) | |
| 1276 { | |
| 1277 mfp->mf_fd = -1; | |
|
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1278 emsg(_("E300: Swap file already exists (symlink attack?)")); |
| 7 | 1279 } |
| 1280 else | |
| 1281 #endif | |
| 1282 { | |
| 1283 /* | |
| 1284 * try to open the file | |
| 1285 */ | |
| 557 | 1286 flags |= O_EXTRA | O_NOFOLLOW; |
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1287 #ifdef MSWIN |
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1288 // Prevent handle inheritance that cause problems with Cscope |
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1289 // (swap file may not be deleted if cscope connection was open after |
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1290 // the file) |
| 7 | 1291 flags |= O_NOINHERIT; |
| 1292 #endif | |
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1293 mfp->mf_flags = flags; |
| 7 | 1294 mfp->mf_fd = mch_open_rw((char *)mfp->mf_fname, flags); |
| 1295 } | |
| 1296 | |
| 1297 /* | |
| 1298 * If the file cannot be opened, use memory only | |
| 1299 */ | |
| 1300 if (mfp->mf_fd < 0) | |
| 1301 { | |
|
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1302 VIM_CLEAR(mfp->mf_fname); |
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1303 VIM_CLEAR(mfp->mf_ffname); |
| 7 | 1304 } |
| 1305 else | |
| 1583 | 1306 { |
| 2003 | 1307 #ifdef HAVE_FD_CLOEXEC |
| 1308 int fdflags = fcntl(mfp->mf_fd, F_GETFD); | |
| 1309 if (fdflags >= 0 && (fdflags & FD_CLOEXEC) == 0) | |
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1310 (void)fcntl(mfp->mf_fd, F_SETFD, fdflags | FD_CLOEXEC); |
| 2003 | 1311 #endif |
| 5788 | 1312 #if defined(HAVE_SELINUX) || defined(HAVE_SMACK) |
| 1583 | 1313 mch_copy_sec(fname, mfp->mf_fname); |
| 1314 #endif | |
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1315 mch_hide(mfp->mf_fname); // try setting the 'hidden' flag |
| 1583 | 1316 } |
| 7 | 1317 } |
| 2730 | 1318 |
| 1319 /* | |
| 1320 * Implementation of mf_hashtab_T follows. | |
| 1321 */ | |
| 1322 | |
| 1323 /* | |
| 1324 * The number of buckets in the hashtable is increased by a factor of | |
| 1325 * MHT_GROWTH_FACTOR when the average number of items per bucket | |
| 1326 * exceeds 2 ^ MHT_LOG_LOAD_FACTOR. | |
| 1327 */ | |
| 1328 #define MHT_LOG_LOAD_FACTOR 6 | |
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1329 #define MHT_GROWTH_FACTOR 2 // must be a power of two |
| 2730 | 1330 |
| 1331 /* | |
| 1332 * Initialize an empty hash table. | |
| 1333 */ | |
| 1334 static void | |
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1335 mf_hash_init(mf_hashtab_T *mht) |
| 2730 | 1336 { |
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1337 CLEAR_POINTER(mht); |
| 2730 | 1338 mht->mht_buckets = mht->mht_small_buckets; |
| 1339 mht->mht_mask = MHT_INIT_SIZE - 1; | |
| 1340 } | |
| 1341 | |
| 1342 /* | |
| 1343 * Free the array of a hash table. Does not free the items it contains! | |
| 1344 * The hash table must not be used again without another mf_hash_init() call. | |
| 1345 */ | |
| 1346 static void | |
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1347 mf_hash_free(mf_hashtab_T *mht) |
| 2730 | 1348 { |
| 1349 if (mht->mht_buckets != mht->mht_small_buckets) | |
| 1350 vim_free(mht->mht_buckets); | |
| 1351 } | |
| 1352 | |
| 1353 /* | |
| 1354 * Free the array of a hash table and all the items it contains. | |
| 1355 */ | |
| 1356 static void | |
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1357 mf_hash_free_all(mf_hashtab_T *mht) |
| 2730 | 1358 { |
| 1359 long_u idx; | |
| 1360 mf_hashitem_T *mhi; | |
| 1361 mf_hashitem_T *next; | |
| 1362 | |
| 1363 for (idx = 0; idx <= mht->mht_mask; idx++) | |
| 1364 for (mhi = mht->mht_buckets[idx]; mhi != NULL; mhi = next) | |
| 1365 { | |
| 1366 next = mhi->mhi_next; | |
| 1367 vim_free(mhi); | |
| 1368 } | |
| 1369 | |
| 1370 mf_hash_free(mht); | |
| 1371 } | |
| 1372 | |
| 1373 /* | |
| 1374 * Find "key" in hashtable "mht". | |
| 1375 * Returns a pointer to a mf_hashitem_T or NULL if the item was not found. | |
| 1376 */ | |
| 1377 static mf_hashitem_T * | |
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1378 mf_hash_find(mf_hashtab_T *mht, blocknr_T key) |
| 2730 | 1379 { |
| 1380 mf_hashitem_T *mhi; | |
| 1381 | |
| 1382 mhi = mht->mht_buckets[key & mht->mht_mask]; | |
| 1383 while (mhi != NULL && mhi->mhi_key != key) | |
| 1384 mhi = mhi->mhi_next; | |
| 1385 | |
| 1386 return mhi; | |
| 1387 } | |
| 1388 | |
| 1389 /* | |
| 1390 * Add item "mhi" to hashtable "mht". | |
| 1391 * "mhi" must not be NULL. | |
| 1392 */ | |
| 1393 static void | |
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1394 mf_hash_add_item(mf_hashtab_T *mht, mf_hashitem_T *mhi) |
| 2730 | 1395 { |
| 1396 long_u idx; | |
| 1397 | |
| 1398 idx = mhi->mhi_key & mht->mht_mask; | |
| 1399 mhi->mhi_next = mht->mht_buckets[idx]; | |
| 1400 mhi->mhi_prev = NULL; | |
| 1401 if (mhi->mhi_next != NULL) | |
| 1402 mhi->mhi_next->mhi_prev = mhi; | |
| 1403 mht->mht_buckets[idx] = mhi; | |
| 1404 | |
| 1405 mht->mht_count++; | |
| 1406 | |
| 1407 /* | |
| 1408 * Grow hashtable when we have more thank 2^MHT_LOG_LOAD_FACTOR | |
| 1409 * items per bucket on average | |
| 1410 */ | |
| 1411 if (mht->mht_fixed == 0 | |
| 1412 && (mht->mht_count >> MHT_LOG_LOAD_FACTOR) > mht->mht_mask) | |
| 1413 { | |
| 1414 if (mf_hash_grow(mht) == FAIL) | |
| 1415 { | |
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1416 // stop trying to grow after first failure to allocate memory |
| 2730 | 1417 mht->mht_fixed = 1; |
| 1418 } | |
| 1419 } | |
| 1420 } | |
| 1421 | |
| 1422 /* | |
| 1423 * Remove item "mhi" from hashtable "mht". | |
| 1424 * "mhi" must not be NULL and must have been inserted into "mht". | |
| 1425 */ | |
| 1426 static void | |
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1427 mf_hash_rem_item(mf_hashtab_T *mht, mf_hashitem_T *mhi) |
| 2730 | 1428 { |
| 1429 if (mhi->mhi_prev == NULL) | |
| 1430 mht->mht_buckets[mhi->mhi_key & mht->mht_mask] = mhi->mhi_next; | |
| 1431 else | |
| 1432 mhi->mhi_prev->mhi_next = mhi->mhi_next; | |
| 1433 | |
| 1434 if (mhi->mhi_next != NULL) | |
| 1435 mhi->mhi_next->mhi_prev = mhi->mhi_prev; | |
| 1436 | |
| 1437 mht->mht_count--; | |
| 1438 | |
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1439 // We could shrink the table here, but it typically takes little memory, |
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1440 // so why bother? |
| 2730 | 1441 } |
| 1442 | |
| 1443 /* | |
| 1444 * Increase number of buckets in the hashtable by MHT_GROWTH_FACTOR and | |
| 1445 * rehash items. | |
| 1446 * Returns FAIL when out of memory. | |
| 1447 */ | |
| 1448 static int | |
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1449 mf_hash_grow(mf_hashtab_T *mht) |
| 2730 | 1450 { |
| 1451 long_u i, j; | |
| 1452 int shift; | |
| 1453 mf_hashitem_T *mhi; | |
| 1454 mf_hashitem_T *tails[MHT_GROWTH_FACTOR]; | |
| 1455 mf_hashitem_T **buckets; | |
| 1456 size_t size; | |
| 1457 | |
| 1458 size = (mht->mht_mask + 1) * MHT_GROWTH_FACTOR * sizeof(void *); | |
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1459 buckets = lalloc_clear(size, FALSE); |
| 2730 | 1460 if (buckets == NULL) |
| 1461 return FAIL; | |
| 1462 | |
| 1463 shift = 0; | |
| 1464 while ((mht->mht_mask >> shift) != 0) | |
| 1465 shift++; | |
| 1466 | |
| 1467 for (i = 0; i <= mht->mht_mask; i++) | |
| 1468 { | |
| 1469 /* | |
| 1470 * Traverse the items in the i-th original bucket and move them into | |
| 1471 * MHT_GROWTH_FACTOR new buckets, preserving their relative order | |
| 1472 * within each new bucket. Preserving the order is important because | |
| 1473 * mf_get() tries to keep most recently used items at the front of | |
| 1474 * each bucket. | |
| 1475 * | |
| 1476 * Here we strongly rely on the fact the hashes are computed modulo | |
| 1477 * a power of two. | |
| 1478 */ | |
| 1479 | |
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1480 CLEAR_FIELD(tails); |
| 2730 | 1481 |
| 1482 for (mhi = mht->mht_buckets[i]; mhi != NULL; mhi = mhi->mhi_next) | |
| 1483 { | |
| 1484 j = (mhi->mhi_key >> shift) & (MHT_GROWTH_FACTOR - 1); | |
| 1485 if (tails[j] == NULL) | |
| 1486 { | |
| 1487 buckets[i + (j << shift)] = mhi; | |
| 1488 tails[j] = mhi; | |
| 1489 mhi->mhi_prev = NULL; | |
| 1490 } | |
| 1491 else | |
| 1492 { | |
| 1493 tails[j]->mhi_next = mhi; | |
| 1494 mhi->mhi_prev = tails[j]; | |
| 1495 tails[j] = mhi; | |
| 1496 } | |
| 1497 } | |
| 1498 | |
| 1499 for (j = 0; j < MHT_GROWTH_FACTOR; j++) | |
| 1500 if (tails[j] != NULL) | |
| 1501 tails[j]->mhi_next = NULL; | |
| 1502 } | |
| 1503 | |
| 1504 if (mht->mht_buckets != mht->mht_small_buckets) | |
| 1505 vim_free(mht->mht_buckets); | |
| 1506 | |
| 1507 mht->mht_buckets = buckets; | |
| 1508 mht->mht_mask = (mht->mht_mask + 1) * MHT_GROWTH_FACTOR - 1; | |
| 1509 | |
| 1510 return OK; | |
| 1511 } |