Mercurial > vim
annotate src/memfile.c @ 2412:ca3f40b0d95e vim73
Prepare for 7.3b release. Fix src/Makefile enabling python3 by default.
| author | Bram Moolenaar <bram@vim.org> |
|---|---|
| date | Sun, 25 Jul 2010 17:42:45 +0200 |
| parents | c08f91142c41 |
| children | 033e7b49356c |
| rev | line source |
|---|---|
| 7 | 1 /* vi:set ts=8 sts=4 sw=4: |
| 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 | |
| 1668 | 35 #if defined(MSDOS) || defined(WIN16) || defined(WIN32) || defined(_WIN64) |
| 714 | 36 # include "vimio.h" /* for lseek(), must be before vim.h */ |
| 7 | 37 #endif |
| 38 | |
| 39 #include "vim.h" | |
| 40 | |
| 41 /* | |
| 42 * Some systems have the page size in statfs.f_bsize, some in stat.st_blksize | |
| 43 */ | |
| 44 #ifdef HAVE_ST_BLKSIZE | |
| 45 # define STATFS stat | |
| 46 # define F_BSIZE st_blksize | |
| 47 # define fstatfs(fd, buf, len, nul) mch_fstat((fd), (buf)) | |
| 48 #else | |
| 49 # ifdef HAVE_SYS_STATFS_H | |
| 50 # include <sys/statfs.h> | |
| 51 # define STATFS statfs | |
| 52 # define F_BSIZE f_bsize | |
| 53 # ifdef __MINT__ /* do we still need this? */ | |
| 54 # define fstatfs(fd, buf, len, nul) mch_fstat((fd), (buf)) | |
| 55 # endif | |
| 56 # endif | |
| 57 #endif | |
| 58 | |
| 59 /* | |
| 60 * for Amiga Dos 2.0x we use Flush | |
| 61 */ | |
| 62 #ifdef AMIGA | |
| 63 # ifdef FEAT_ARP | |
| 64 extern int dos2; /* this is in os_amiga.c */ | |
| 65 # endif | |
| 66 # ifdef SASC | |
| 67 # include <proto/dos.h> | |
| 68 # include <ios1.h> /* for chkufb() */ | |
| 69 # endif | |
| 70 #endif | |
| 71 | |
| 72 #define MEMFILE_PAGE_SIZE 4096 /* default page size */ | |
| 73 | |
| 74 static long_u total_mem_used = 0; /* total memory used for memfiles */ | |
| 75 | |
| 76 static void mf_ins_hash __ARGS((memfile_T *, bhdr_T *)); | |
| 77 static void mf_rem_hash __ARGS((memfile_T *, bhdr_T *)); | |
| 78 static bhdr_T *mf_find_hash __ARGS((memfile_T *, blocknr_T)); | |
| 79 static void mf_ins_used __ARGS((memfile_T *, bhdr_T *)); | |
| 80 static void mf_rem_used __ARGS((memfile_T *, bhdr_T *)); | |
| 81 static bhdr_T *mf_release __ARGS((memfile_T *, int)); | |
| 82 static bhdr_T *mf_alloc_bhdr __ARGS((memfile_T *, int)); | |
| 83 static void mf_free_bhdr __ARGS((bhdr_T *)); | |
| 84 static void mf_ins_free __ARGS((memfile_T *, bhdr_T *)); | |
| 85 static bhdr_T *mf_rem_free __ARGS((memfile_T *)); | |
| 86 static int mf_read __ARGS((memfile_T *, bhdr_T *)); | |
| 87 static int mf_write __ARGS((memfile_T *, bhdr_T *)); | |
| 2267 | 88 static int mf_write_block __ARGS((memfile_T *mfp, bhdr_T *hp, off_t offset, unsigned size)); |
| 7 | 89 static int mf_trans_add __ARGS((memfile_T *, bhdr_T *)); |
| 90 static void mf_do_open __ARGS((memfile_T *, char_u *, int)); | |
| 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 * | |
| 121 mf_open(fname, flags) | |
| 122 char_u *fname; | |
| 123 int flags; | |
| 124 { | |
| 125 memfile_T *mfp; | |
| 126 int i; | |
| 127 off_t size; | |
| 128 #if defined(STATFS) && defined(UNIX) && !defined(__QNX__) | |
| 129 # define USE_FSTATFS | |
| 130 struct STATFS stf; | |
| 131 #endif | |
| 132 | |
| 133 if ((mfp = (memfile_T *)alloc((unsigned)sizeof(memfile_T))) == NULL) | |
| 134 return NULL; | |
| 135 | |
| 136 if (fname == NULL) /* no file for this memfile, use memory only */ | |
| 137 { | |
| 138 mfp->mf_fname = NULL; | |
| 139 mfp->mf_ffname = NULL; | |
| 140 mfp->mf_fd = -1; | |
| 141 } | |
| 142 else | |
| 143 { | |
| 144 mf_do_open(mfp, fname, flags); /* try to open the file */ | |
| 145 | |
| 146 /* if the file cannot be opened, return here */ | |
| 147 if (mfp->mf_fd < 0) | |
| 148 { | |
| 149 vim_free(mfp); | |
| 150 return NULL; | |
| 151 } | |
| 152 } | |
| 153 | |
| 154 mfp->mf_free_first = NULL; /* free list is empty */ | |
| 155 mfp->mf_used_first = NULL; /* used list is empty */ | |
| 156 mfp->mf_used_last = NULL; | |
| 157 mfp->mf_dirty = FALSE; | |
| 158 mfp->mf_used_count = 0; | |
| 159 for (i = 0; i < MEMHASHSIZE; ++i) | |
| 160 { | |
| 161 mfp->mf_hash[i] = NULL; /* hash lists are empty */ | |
| 162 mfp->mf_trans[i] = NULL; /* trans lists are empty */ | |
| 163 } | |
| 164 mfp->mf_page_size = MEMFILE_PAGE_SIZE; | |
| 2267 | 165 #ifdef FEAT_CRYPT |
| 166 mfp->mf_old_key = NULL; | |
| 167 #endif | |
| 7 | 168 |
| 169 #ifdef USE_FSTATFS | |
| 170 /* | |
| 171 * Try to set the page size equal to the block size of the device. | |
| 172 * Speeds up I/O a lot. | |
| 173 * When recovering, the actual block size will be retrieved from block 0 | |
| 174 * in ml_recover(). The size used here may be wrong, therefore | |
| 175 * mf_blocknr_max must be rounded up. | |
| 176 */ | |
| 177 if (mfp->mf_fd >= 0 | |
| 178 && fstatfs(mfp->mf_fd, &stf, sizeof(struct statfs), 0) == 0 | |
| 179 && stf.F_BSIZE >= MIN_SWAP_PAGE_SIZE | |
| 180 && stf.F_BSIZE <= MAX_SWAP_PAGE_SIZE) | |
| 181 mfp->mf_page_size = stf.F_BSIZE; | |
| 182 #endif | |
| 183 | |
| 184 if (mfp->mf_fd < 0 || (flags & (O_TRUNC|O_EXCL)) | |
| 185 || (size = lseek(mfp->mf_fd, (off_t)0L, SEEK_END)) <= 0) | |
| 186 mfp->mf_blocknr_max = 0; /* no file or empty file */ | |
| 187 else | |
| 188 mfp->mf_blocknr_max = (blocknr_T)((size + mfp->mf_page_size - 1) | |
| 189 / mfp->mf_page_size); | |
| 190 mfp->mf_blocknr_min = -1; | |
| 191 mfp->mf_neg_count = 0; | |
| 192 mfp->mf_infile_count = mfp->mf_blocknr_max; | |
| 1230 | 193 |
| 194 /* | |
| 195 * Compute maximum number of pages ('maxmem' is in Kbyte): | |
| 196 * 'mammem' * 1Kbyte / page-size-in-bytes. | |
| 197 * Avoid overflow by first reducing page size as much as possible. | |
| 198 */ | |
| 199 { | |
| 200 int shift = 10; | |
| 201 unsigned page_size = mfp->mf_page_size; | |
| 202 | |
| 203 while (shift > 0 && (page_size & 1) == 0) | |
| 204 { | |
| 205 page_size = page_size >> 1; | |
| 206 --shift; | |
| 207 } | |
| 208 mfp->mf_used_count_max = (p_mm << shift) / page_size; | |
| 209 if (mfp->mf_used_count_max < 10) | |
| 210 mfp->mf_used_count_max = 10; | |
| 211 } | |
| 7 | 212 |
| 213 return mfp; | |
| 214 } | |
| 215 | |
| 216 /* | |
| 217 * Open a file for an existing memfile. Used when updatecount set from 0 to | |
| 218 * some value. | |
| 219 * If the file already exists, this fails. | |
| 220 * "fname" is the name of file to use (NULL means no file at all) | |
| 221 * Note: "fname" must have been allocated, it is not copied! If opening the | |
| 222 * file fails, "fname" is freed. | |
| 223 * | |
| 224 * return value: FAIL if file could not be opened, OK otherwise | |
| 225 */ | |
| 226 int | |
| 227 mf_open_file(mfp, fname) | |
| 228 memfile_T *mfp; | |
| 229 char_u *fname; | |
| 230 { | |
| 231 mf_do_open(mfp, fname, O_RDWR|O_CREAT|O_EXCL); /* try to open the file */ | |
| 232 | |
| 233 if (mfp->mf_fd < 0) | |
| 234 return FAIL; | |
| 235 | |
| 236 mfp->mf_dirty = TRUE; | |
| 237 return OK; | |
| 238 } | |
| 239 | |
| 240 /* | |
|
2249
6d3d35ff2c2b
Use full path in undofile(). Updated docs.
Bram Moolenaar <bram@vim.org>
parents:
2003
diff
changeset
|
241 * Close a memory file and delete the associated file if 'del_file' is TRUE. |
| 7 | 242 */ |
| 243 void | |
| 244 mf_close(mfp, del_file) | |
| 245 memfile_T *mfp; | |
| 246 int del_file; | |
| 247 { | |
| 248 bhdr_T *hp, *nextp; | |
| 249 NR_TRANS *tp, *tpnext; | |
| 250 int i; | |
| 251 | |
| 252 if (mfp == NULL) /* safety check */ | |
| 253 return; | |
| 254 if (mfp->mf_fd >= 0) | |
| 255 { | |
| 256 if (close(mfp->mf_fd) < 0) | |
| 257 EMSG(_(e_swapclose)); | |
| 258 } | |
| 259 if (del_file && mfp->mf_fname != NULL) | |
| 260 mch_remove(mfp->mf_fname); | |
| 261 /* free entries in used list */ | |
| 262 for (hp = mfp->mf_used_first; hp != NULL; hp = nextp) | |
| 263 { | |
| 264 total_mem_used -= hp->bh_page_count * mfp->mf_page_size; | |
| 265 nextp = hp->bh_next; | |
| 266 mf_free_bhdr(hp); | |
| 267 } | |
| 268 while (mfp->mf_free_first != NULL) /* free entries in free list */ | |
| 269 vim_free(mf_rem_free(mfp)); | |
| 270 for (i = 0; i < MEMHASHSIZE; ++i) /* free entries in trans lists */ | |
| 271 for (tp = mfp->mf_trans[i]; tp != NULL; tp = tpnext) | |
| 272 { | |
| 273 tpnext = tp->nt_next; | |
| 274 vim_free(tp); | |
| 275 } | |
| 276 vim_free(mfp->mf_fname); | |
| 277 vim_free(mfp->mf_ffname); | |
| 278 vim_free(mfp); | |
| 279 } | |
| 280 | |
| 281 /* | |
| 282 * Close the swap file for a memfile. Used when 'swapfile' is reset. | |
| 283 */ | |
| 284 void | |
| 285 mf_close_file(buf, getlines) | |
| 286 buf_T *buf; | |
| 287 int getlines; /* get all lines into memory? */ | |
| 288 { | |
| 289 memfile_T *mfp; | |
| 290 linenr_T lnum; | |
| 291 | |
| 292 mfp = buf->b_ml.ml_mfp; | |
| 293 if (mfp == NULL || mfp->mf_fd < 0) /* nothing to close */ | |
| 294 return; | |
| 295 | |
| 296 if (getlines) | |
| 297 { | |
| 298 /* get all blocks in memory by accessing all lines (clumsy!) */ | |
| 1066 | 299 mf_dont_release = TRUE; |
| 7 | 300 for (lnum = 1; lnum <= buf->b_ml.ml_line_count; ++lnum) |
| 301 (void)ml_get_buf(buf, lnum, FALSE); | |
| 1066 | 302 mf_dont_release = FALSE; |
| 7 | 303 /* TODO: should check if all blocks are really in core */ |
| 304 } | |
| 305 | |
| 306 if (close(mfp->mf_fd) < 0) /* close the file */ | |
| 307 EMSG(_(e_swapclose)); | |
| 308 mfp->mf_fd = -1; | |
| 309 | |
| 310 if (mfp->mf_fname != NULL) | |
| 311 { | |
| 312 mch_remove(mfp->mf_fname); /* delete the swap file */ | |
| 313 vim_free(mfp->mf_fname); | |
| 314 vim_free(mfp->mf_ffname); | |
| 315 mfp->mf_fname = NULL; | |
| 316 mfp->mf_ffname = NULL; | |
| 317 } | |
| 318 } | |
| 319 | |
| 320 /* | |
| 321 * Set new size for a memfile. Used when block 0 of a swapfile has been read | |
| 322 * and the size it indicates differs from what was guessed. | |
| 323 */ | |
| 324 void | |
| 325 mf_new_page_size(mfp, new_size) | |
| 326 memfile_T *mfp; | |
| 327 unsigned new_size; | |
| 328 { | |
| 329 /* Correct the memory used for block 0 to the new size, because it will be | |
| 330 * freed with that size later on. */ | |
| 331 total_mem_used += new_size - mfp->mf_page_size; | |
| 332 mfp->mf_page_size = new_size; | |
| 333 } | |
| 334 | |
| 335 /* | |
| 336 * get a new block | |
| 337 * | |
| 338 * negative: TRUE if negative block number desired (data block) | |
| 339 */ | |
| 340 bhdr_T * | |
| 341 mf_new(mfp, negative, page_count) | |
| 342 memfile_T *mfp; | |
| 343 int negative; | |
| 344 int page_count; | |
| 345 { | |
| 1166 | 346 bhdr_T *hp; /* new bhdr_T */ |
| 347 bhdr_T *freep; /* first block in free list */ | |
| 348 char_u *p; | |
| 7 | 349 |
| 350 /* | |
| 351 * If we reached the maximum size for the used memory blocks, release one | |
| 352 * If a bhdr_T is returned, use it and adjust the page_count if necessary. | |
| 353 */ | |
| 354 hp = mf_release(mfp, page_count); | |
| 355 | |
| 356 /* | |
| 357 * Decide on the number to use: | |
| 358 * If there is a free block, use its number. | |
| 359 * Otherwise use mf_block_min for a negative number, mf_block_max for | |
| 360 * a positive number. | |
| 361 */ | |
| 362 freep = mfp->mf_free_first; | |
| 363 if (!negative && freep != NULL && freep->bh_page_count >= page_count) | |
| 364 { | |
| 365 /* | |
| 366 * If the block in the free list has more pages, take only the number | |
| 367 * of pages needed and allocate a new bhdr_T with data | |
| 368 * | |
| 1166 | 369 * If the number of pages matches and mf_release() did not return a |
| 370 * bhdr_T, use the bhdr_T from the free list and allocate the data | |
| 7 | 371 * |
| 1166 | 372 * If the number of pages matches and mf_release() returned a bhdr_T, |
| 7 | 373 * just use the number and free the bhdr_T from the free list |
| 374 */ | |
| 375 if (freep->bh_page_count > page_count) | |
| 376 { | |
| 377 if (hp == NULL && (hp = mf_alloc_bhdr(mfp, page_count)) == NULL) | |
| 378 return NULL; | |
| 379 hp->bh_bnum = freep->bh_bnum; | |
| 380 freep->bh_bnum += page_count; | |
| 381 freep->bh_page_count -= page_count; | |
| 382 } | |
| 383 else if (hp == NULL) /* need to allocate memory for this block */ | |
| 384 { | |
| 385 if ((p = (char_u *)alloc(mfp->mf_page_size * page_count)) == NULL) | |
| 386 return NULL; | |
| 387 hp = mf_rem_free(mfp); | |
| 388 hp->bh_data = p; | |
| 389 } | |
| 390 else /* use the number, remove entry from free list */ | |
| 391 { | |
| 392 freep = mf_rem_free(mfp); | |
| 393 hp->bh_bnum = freep->bh_bnum; | |
| 394 vim_free(freep); | |
| 395 } | |
| 396 } | |
| 397 else /* get a new number */ | |
| 398 { | |
| 399 if (hp == NULL && (hp = mf_alloc_bhdr(mfp, page_count)) == NULL) | |
| 400 return NULL; | |
| 401 if (negative) | |
| 402 { | |
| 403 hp->bh_bnum = mfp->mf_blocknr_min--; | |
| 404 mfp->mf_neg_count++; | |
| 405 } | |
| 406 else | |
| 407 { | |
| 408 hp->bh_bnum = mfp->mf_blocknr_max; | |
| 409 mfp->mf_blocknr_max += page_count; | |
| 410 } | |
| 411 } | |
| 412 hp->bh_flags = BH_LOCKED | BH_DIRTY; /* new block is always dirty */ | |
| 413 mfp->mf_dirty = TRUE; | |
| 414 hp->bh_page_count = page_count; | |
| 415 mf_ins_used(mfp, hp); | |
| 416 mf_ins_hash(mfp, hp); | |
| 417 | |
| 418 /* | |
| 419 * Init the data to all zero, to avoid reading uninitialized data. | |
| 420 * This also avoids that the passwd file ends up in the swap file! | |
| 421 */ | |
|
2249
6d3d35ff2c2b
Use full path in undofile(). Updated docs.
Bram Moolenaar <bram@vim.org>
parents:
2003
diff
changeset
|
422 (void)vim_memset((char *)(hp->bh_data), 0, |
|
6d3d35ff2c2b
Use full path in undofile(). Updated docs.
Bram Moolenaar <bram@vim.org>
parents:
2003
diff
changeset
|
423 (size_t)mfp->mf_page_size * page_count); |
| 7 | 424 |
| 425 return hp; | |
| 426 } | |
| 427 | |
| 428 /* | |
| 2267 | 429 * Get existing block "nr" with "page_count" pages. |
| 7 | 430 * |
| 431 * Note: The caller should first check a negative nr with mf_trans_del() | |
| 432 */ | |
| 433 bhdr_T * | |
| 434 mf_get(mfp, nr, page_count) | |
| 435 memfile_T *mfp; | |
| 436 blocknr_T nr; | |
| 437 int page_count; | |
| 438 { | |
| 439 bhdr_T *hp; | |
| 440 /* doesn't exist */ | |
| 441 if (nr >= mfp->mf_blocknr_max || nr <= mfp->mf_blocknr_min) | |
| 442 return NULL; | |
| 443 | |
| 444 /* | |
| 445 * see if it is in the cache | |
| 446 */ | |
| 447 hp = mf_find_hash(mfp, nr); | |
| 448 if (hp == NULL) /* not in the hash list */ | |
| 449 { | |
| 450 if (nr < 0 || nr >= mfp->mf_infile_count) /* can't be in the file */ | |
| 451 return NULL; | |
| 452 | |
| 453 /* could check here if the block is in the free list */ | |
| 454 | |
| 455 /* | |
| 456 * Check if we need to flush an existing block. | |
| 457 * If so, use that block. | |
| 458 * If not, allocate a new block. | |
| 459 */ | |
| 460 hp = mf_release(mfp, page_count); | |
| 461 if (hp == NULL && (hp = mf_alloc_bhdr(mfp, page_count)) == NULL) | |
| 462 return NULL; | |
| 463 | |
| 464 hp->bh_bnum = nr; | |
| 465 hp->bh_flags = 0; | |
| 466 hp->bh_page_count = page_count; | |
| 467 if (mf_read(mfp, hp) == FAIL) /* cannot read the block! */ | |
| 468 { | |
| 469 mf_free_bhdr(hp); | |
| 470 return NULL; | |
| 471 } | |
| 472 } | |
| 473 else | |
| 474 { | |
| 475 mf_rem_used(mfp, hp); /* remove from list, insert in front below */ | |
| 476 mf_rem_hash(mfp, hp); | |
| 477 } | |
| 478 | |
| 479 hp->bh_flags |= BH_LOCKED; | |
| 480 mf_ins_used(mfp, hp); /* put in front of used list */ | |
| 481 mf_ins_hash(mfp, hp); /* put in front of hash list */ | |
| 482 | |
| 483 return hp; | |
| 484 } | |
| 485 | |
| 486 /* | |
| 487 * release the block *hp | |
| 488 * | |
| 489 * dirty: Block must be written to file later | |
| 490 * infile: Block should be in file (needed for recovery) | |
| 491 * | |
| 492 * no return value, function cannot fail | |
| 493 */ | |
| 494 void | |
| 495 mf_put(mfp, hp, dirty, infile) | |
| 496 memfile_T *mfp; | |
| 497 bhdr_T *hp; | |
| 498 int dirty; | |
| 499 int infile; | |
| 500 { | |
| 501 int flags; | |
| 502 | |
| 503 flags = hp->bh_flags; | |
| 504 | |
| 505 if ((flags & BH_LOCKED) == 0) | |
| 506 EMSG(_("E293: block was not locked")); | |
| 507 flags &= ~BH_LOCKED; | |
| 508 if (dirty) | |
| 509 { | |
| 510 flags |= BH_DIRTY; | |
| 511 mfp->mf_dirty = TRUE; | |
| 512 } | |
| 513 hp->bh_flags = flags; | |
| 514 if (infile) | |
| 515 mf_trans_add(mfp, hp); /* may translate negative in positive nr */ | |
| 516 } | |
| 517 | |
| 518 /* | |
| 519 * block *hp is no longer in used, may put it in the free list of memfile *mfp | |
| 520 */ | |
| 521 void | |
| 522 mf_free(mfp, hp) | |
| 523 memfile_T *mfp; | |
| 524 bhdr_T *hp; | |
| 525 { | |
| 526 vim_free(hp->bh_data); /* free the memory */ | |
| 527 mf_rem_hash(mfp, hp); /* get *hp out of the hash list */ | |
| 528 mf_rem_used(mfp, hp); /* get *hp out of the used list */ | |
| 529 if (hp->bh_bnum < 0) | |
| 530 { | |
| 531 vim_free(hp); /* don't want negative numbers in free list */ | |
| 532 mfp->mf_neg_count--; | |
| 533 } | |
| 534 else | |
| 535 mf_ins_free(mfp, hp); /* put *hp in the free list */ | |
| 536 } | |
| 537 | |
| 984 | 538 #if defined(__MORPHOS__) && defined(__libnix__) |
| 7 | 539 /* function is missing in MorphOS libnix version */ |
| 540 extern unsigned long *__stdfiledes; | |
| 541 | |
| 542 static unsigned long | |
| 543 fdtofh(int filedescriptor) | |
| 544 { | |
| 545 return __stdfiledes[filedescriptor]; | |
| 546 } | |
| 547 #endif | |
| 548 | |
| 549 /* | |
| 550 * Sync the memory file *mfp to disk. | |
| 551 * Flags: | |
| 552 * MFS_ALL If not given, blocks with negative numbers are not synced, | |
| 553 * even when they are dirty! | |
| 554 * MFS_STOP Stop syncing when a character becomes available, but sync at | |
| 555 * least one block. | |
| 556 * MFS_FLUSH Make sure buffers are flushed to disk, so they will survive a | |
| 557 * system crash. | |
| 558 * MFS_ZERO Only write block 0. | |
| 559 * | |
| 560 * Return FAIL for failure, OK otherwise | |
| 561 */ | |
| 562 int | |
| 563 mf_sync(mfp, flags) | |
| 564 memfile_T *mfp; | |
| 565 int flags; | |
| 566 { | |
| 567 int status; | |
| 568 bhdr_T *hp; | |
| 569 #if defined(SYNC_DUP_CLOSE) && !defined(MSDOS) | |
| 570 int fd; | |
| 571 #endif | |
| 572 int got_int_save = got_int; | |
| 573 | |
| 574 if (mfp->mf_fd < 0) /* there is no file, nothing to do */ | |
| 575 { | |
| 576 mfp->mf_dirty = FALSE; | |
| 577 return FAIL; | |
| 578 } | |
| 579 | |
| 580 /* Only a CTRL-C while writing will break us here, not one typed | |
| 581 * previously. */ | |
| 582 got_int = FALSE; | |
| 583 | |
| 584 /* | |
| 585 * sync from last to first (may reduce the probability of an inconsistent | |
| 586 * file) If a write fails, it is very likely caused by a full filesystem. | |
| 587 * Then we only try to write blocks within the existing file. If that also | |
| 588 * fails then we give up. | |
| 589 */ | |
| 590 status = OK; | |
| 591 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev) | |
| 592 if (((flags & MFS_ALL) || hp->bh_bnum >= 0) | |
| 593 && (hp->bh_flags & BH_DIRTY) | |
| 594 && (status == OK || (hp->bh_bnum >= 0 | |
| 595 && hp->bh_bnum < mfp->mf_infile_count))) | |
| 596 { | |
| 597 if ((flags & MFS_ZERO) && hp->bh_bnum != 0) | |
| 598 continue; | |
| 599 if (mf_write(mfp, hp) == FAIL) | |
| 600 { | |
| 601 if (status == FAIL) /* double error: quit syncing */ | |
| 602 break; | |
| 603 status = FAIL; | |
| 604 } | |
| 605 if (flags & MFS_STOP) | |
| 606 { | |
| 607 /* Stop when char available now. */ | |
| 608 if (ui_char_avail()) | |
| 609 break; | |
| 610 } | |
| 611 else | |
| 612 ui_breakcheck(); | |
| 613 if (got_int) | |
| 614 break; | |
| 615 } | |
| 616 | |
| 617 /* | |
| 618 * If the whole list is flushed, the memfile is not dirty anymore. | |
| 619 * In case of an error this flag is also set, to avoid trying all the time. | |
| 620 */ | |
| 621 if (hp == NULL || status == FAIL) | |
| 622 mfp->mf_dirty = FALSE; | |
| 623 | |
| 624 if ((flags & MFS_FLUSH) && *p_sws != NUL) | |
| 625 { | |
| 626 #if defined(UNIX) | |
| 627 # ifdef HAVE_FSYNC | |
| 628 /* | |
| 629 * most Unixes have the very useful fsync() function, just what we need. | |
| 630 * However, with OS/2 and EMX it is also available, but there are | |
| 631 * reports of bad problems with it (a bug in HPFS.IFS). | |
| 632 * So we disable use of it here in case someone tries to be smart | |
| 633 * and changes os_os2_cfg.h... (even though there is no __EMX__ test | |
| 634 * in the #if, as __EMX__ does not have sync(); we hope for a timely | |
| 635 * sync from the system itself). | |
| 636 */ | |
| 637 # if defined(__EMX__) | |
| 638 error "Dont use fsync with EMX! Read emxdoc.doc or emxfix01.doc for info." | |
| 639 # endif | |
| 640 if (STRCMP(p_sws, "fsync") == 0) | |
| 641 { | |
| 642 if (fsync(mfp->mf_fd)) | |
| 643 status = FAIL; | |
| 644 } | |
| 645 else | |
| 646 # endif | |
| 647 /* OpenNT is strictly POSIX (Benzinger) */ | |
| 648 /* Tandem/Himalaya NSK-OSS doesn't have sync() */ | |
| 649 # if defined(__OPENNT) || defined(__TANDEM) | |
| 650 fflush(NULL); | |
| 651 # else | |
| 652 sync(); | |
| 653 # endif | |
| 654 #endif | |
| 655 #ifdef VMS | |
| 656 if (STRCMP(p_sws, "fsync") == 0) | |
| 657 { | |
| 658 if (fsync(mfp->mf_fd)) | |
| 659 status = FAIL; | |
| 660 } | |
| 661 #endif | |
| 662 #ifdef MSDOS | |
| 663 if (_dos_commit(mfp->mf_fd)) | |
| 664 status = FAIL; | |
| 665 #else | |
| 666 # ifdef SYNC_DUP_CLOSE | |
| 667 /* | |
| 668 * Win32 is a bit more work: Duplicate the file handle and close it. | |
| 669 * This should flush the file to disk. | |
| 670 */ | |
| 671 if ((fd = dup(mfp->mf_fd)) >= 0) | |
| 672 close(fd); | |
| 673 # endif | |
| 674 #endif | |
| 675 #ifdef AMIGA | |
| 1030 | 676 # if defined(__AROS__) || defined(__amigaos4__) |
| 7 | 677 if (fsync(mfp->mf_fd) != 0) |
| 678 status = FAIL; | |
| 679 # else | |
| 680 /* | |
| 681 * Flush() only exists for AmigaDos 2.0. | |
| 682 * For 1.3 it should be done with close() + open(), but then the risk | |
| 683 * is that the open() may fail and lose the file.... | |
| 684 */ | |
| 685 # ifdef FEAT_ARP | |
| 686 if (dos2) | |
| 687 # endif | |
| 688 # ifdef SASC | |
| 689 { | |
| 690 struct UFB *fp = chkufb(mfp->mf_fd); | |
| 691 | |
| 692 if (fp != NULL) | |
| 693 Flush(fp->ufbfh); | |
| 694 } | |
| 695 # else | |
| 696 # if defined(_DCC) || defined(__GNUC__) || defined(__MORPHOS__) | |
| 697 { | |
| 984 | 698 # if defined(__GNUC__) && !defined(__MORPHOS__) && defined(__libnix__) |
| 7 | 699 /* Have function (in libnix at least), |
| 700 * but ain't got no prototype anywhere. */ | |
| 701 extern unsigned long fdtofh(int filedescriptor); | |
| 702 # endif | |
| 984 | 703 # if !defined(__libnix__) |
| 704 fflush(NULL); | |
| 705 # else | |
| 7 | 706 BPTR fh = (BPTR)fdtofh(mfp->mf_fd); |
| 707 | |
| 708 if (fh != 0) | |
| 709 Flush(fh); | |
| 984 | 710 # endif |
| 7 | 711 } |
| 712 # else /* assume Manx */ | |
| 713 Flush(_devtab[mfp->mf_fd].fd); | |
| 714 # endif | |
| 715 # endif | |
| 716 # endif | |
| 717 #endif /* AMIGA */ | |
| 718 } | |
| 719 | |
| 720 got_int |= got_int_save; | |
| 721 | |
| 722 return status; | |
| 723 } | |
| 724 | |
| 725 /* | |
| 630 | 726 * For all blocks in memory file *mfp that have a positive block number set |
| 727 * the dirty flag. These are blocks that need to be written to a newly | |
| 728 * created swapfile. | |
| 729 */ | |
| 730 void | |
| 731 mf_set_dirty(mfp) | |
| 732 memfile_T *mfp; | |
| 733 { | |
| 734 bhdr_T *hp; | |
| 735 | |
| 736 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev) | |
| 737 if (hp->bh_bnum > 0) | |
| 738 hp->bh_flags |= BH_DIRTY; | |
| 739 mfp->mf_dirty = TRUE; | |
| 740 } | |
| 741 | |
| 742 /* | |
| 7 | 743 * insert block *hp in front of hashlist of memfile *mfp |
| 744 */ | |
| 745 static void | |
| 746 mf_ins_hash(mfp, hp) | |
| 747 memfile_T *mfp; | |
| 748 bhdr_T *hp; | |
| 749 { | |
| 750 bhdr_T *hhp; | |
| 751 int hash; | |
| 752 | |
| 753 hash = MEMHASH(hp->bh_bnum); | |
| 754 hhp = mfp->mf_hash[hash]; | |
| 755 hp->bh_hash_next = hhp; | |
| 756 hp->bh_hash_prev = NULL; | |
| 757 if (hhp != NULL) | |
| 758 hhp->bh_hash_prev = hp; | |
| 759 mfp->mf_hash[hash] = hp; | |
| 760 } | |
| 761 | |
| 762 /* | |
| 763 * remove block *hp from hashlist of memfile list *mfp | |
| 764 */ | |
| 765 static void | |
| 766 mf_rem_hash(mfp, hp) | |
| 767 memfile_T *mfp; | |
| 768 bhdr_T *hp; | |
| 769 { | |
| 770 if (hp->bh_hash_prev == NULL) | |
| 771 mfp->mf_hash[MEMHASH(hp->bh_bnum)] = hp->bh_hash_next; | |
| 772 else | |
| 773 hp->bh_hash_prev->bh_hash_next = hp->bh_hash_next; | |
| 774 | |
| 775 if (hp->bh_hash_next) | |
| 776 hp->bh_hash_next->bh_hash_prev = hp->bh_hash_prev; | |
| 777 } | |
| 778 | |
| 779 /* | |
| 780 * look in hash lists of memfile *mfp for block header with number 'nr' | |
| 781 */ | |
| 782 static bhdr_T * | |
| 783 mf_find_hash(mfp, nr) | |
| 784 memfile_T *mfp; | |
| 785 blocknr_T nr; | |
| 786 { | |
| 787 bhdr_T *hp; | |
| 788 | |
| 789 for (hp = mfp->mf_hash[MEMHASH(nr)]; hp != NULL; hp = hp->bh_hash_next) | |
| 790 if (hp->bh_bnum == nr) | |
| 791 break; | |
| 792 return hp; | |
| 793 } | |
| 794 | |
| 795 /* | |
| 796 * insert block *hp in front of used list of memfile *mfp | |
| 797 */ | |
| 798 static void | |
| 799 mf_ins_used(mfp, hp) | |
| 800 memfile_T *mfp; | |
| 801 bhdr_T *hp; | |
| 802 { | |
| 803 hp->bh_next = mfp->mf_used_first; | |
| 804 mfp->mf_used_first = hp; | |
| 805 hp->bh_prev = NULL; | |
| 806 if (hp->bh_next == NULL) /* list was empty, adjust last pointer */ | |
| 807 mfp->mf_used_last = hp; | |
| 808 else | |
| 809 hp->bh_next->bh_prev = hp; | |
| 810 mfp->mf_used_count += hp->bh_page_count; | |
| 811 total_mem_used += hp->bh_page_count * mfp->mf_page_size; | |
| 812 } | |
| 813 | |
| 814 /* | |
| 815 * remove block *hp from used list of memfile *mfp | |
| 816 */ | |
| 817 static void | |
| 818 mf_rem_used(mfp, hp) | |
| 819 memfile_T *mfp; | |
| 820 bhdr_T *hp; | |
| 821 { | |
| 822 if (hp->bh_next == NULL) /* last block in used list */ | |
| 823 mfp->mf_used_last = hp->bh_prev; | |
| 824 else | |
| 825 hp->bh_next->bh_prev = hp->bh_prev; | |
| 826 if (hp->bh_prev == NULL) /* first block in used list */ | |
| 827 mfp->mf_used_first = hp->bh_next; | |
| 828 else | |
| 829 hp->bh_prev->bh_next = hp->bh_next; | |
| 830 mfp->mf_used_count -= hp->bh_page_count; | |
| 831 total_mem_used -= hp->bh_page_count * mfp->mf_page_size; | |
| 832 } | |
| 833 | |
| 834 /* | |
| 835 * Release the least recently used block from the used list if the number | |
| 836 * of used memory blocks gets to big. | |
| 837 * | |
| 838 * Return the block header to the caller, including the memory block, so | |
| 839 * it can be re-used. Make sure the page_count is right. | |
| 840 */ | |
| 841 static bhdr_T * | |
| 842 mf_release(mfp, page_count) | |
| 843 memfile_T *mfp; | |
| 844 int page_count; | |
| 845 { | |
| 846 bhdr_T *hp; | |
| 847 int need_release; | |
| 848 buf_T *buf; | |
| 849 | |
| 850 /* don't release while in mf_close_file() */ | |
| 1066 | 851 if (mf_dont_release) |
| 7 | 852 return NULL; |
| 853 | |
| 854 /* | |
| 855 * Need to release a block if the number of blocks for this memfile is | |
| 856 * higher than the maximum or total memory used is over 'maxmemtot' | |
| 857 */ | |
| 858 need_release = ((mfp->mf_used_count >= mfp->mf_used_count_max) | |
| 859 || (total_mem_used >> 10) >= (long_u)p_mmt); | |
| 860 | |
| 861 /* | |
| 862 * Try to create a swap file if the amount of memory used is getting too | |
| 863 * high. | |
| 864 */ | |
| 865 if (mfp->mf_fd < 0 && need_release && p_uc) | |
| 866 { | |
| 867 /* find for which buffer this memfile is */ | |
| 868 for (buf = firstbuf; buf != NULL; buf = buf->b_next) | |
| 869 if (buf->b_ml.ml_mfp == mfp) | |
| 870 break; | |
| 871 if (buf != NULL && buf->b_may_swap) | |
| 872 ml_open_file(buf); | |
| 873 } | |
| 874 | |
| 875 /* | |
| 876 * don't release a block if | |
| 877 * there is no file for this memfile | |
| 878 * or | |
| 879 * the number of blocks for this memfile is lower than the maximum | |
| 880 * and | |
| 881 * total memory used is not up to 'maxmemtot' | |
| 882 */ | |
| 883 if (mfp->mf_fd < 0 || !need_release) | |
| 884 return NULL; | |
| 885 | |
| 886 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev) | |
| 887 if (!(hp->bh_flags & BH_LOCKED)) | |
| 888 break; | |
| 889 if (hp == NULL) /* not a single one that can be released */ | |
| 890 return NULL; | |
| 891 | |
| 892 /* | |
| 893 * If the block is dirty, write it. | |
| 894 * If the write fails we don't free it. | |
| 895 */ | |
| 896 if ((hp->bh_flags & BH_DIRTY) && mf_write(mfp, hp) == FAIL) | |
| 897 return NULL; | |
| 898 | |
| 899 mf_rem_used(mfp, hp); | |
| 900 mf_rem_hash(mfp, hp); | |
| 901 | |
| 902 /* | |
| 903 * If a bhdr_T is returned, make sure that the page_count of bh_data is | |
| 904 * right | |
| 905 */ | |
| 906 if (hp->bh_page_count != page_count) | |
| 907 { | |
| 908 vim_free(hp->bh_data); | |
| 909 if ((hp->bh_data = alloc(mfp->mf_page_size * page_count)) == NULL) | |
| 910 { | |
| 911 vim_free(hp); | |
| 912 return NULL; | |
| 913 } | |
| 914 hp->bh_page_count = page_count; | |
| 915 } | |
| 916 return hp; | |
| 917 } | |
| 918 | |
| 919 /* | |
| 920 * release as many blocks as possible | |
| 921 * Used in case of out of memory | |
| 922 * | |
| 923 * return TRUE if any memory was released | |
| 924 */ | |
| 925 int | |
| 926 mf_release_all() | |
| 927 { | |
| 928 buf_T *buf; | |
| 929 memfile_T *mfp; | |
| 930 bhdr_T *hp; | |
| 931 int retval = FALSE; | |
| 932 | |
| 933 for (buf = firstbuf; buf != NULL; buf = buf->b_next) | |
| 934 { | |
| 935 mfp = buf->b_ml.ml_mfp; | |
| 936 if (mfp != NULL) | |
| 937 { | |
| 938 /* If no swap file yet, may open one */ | |
| 939 if (mfp->mf_fd < 0 && buf->b_may_swap) | |
| 940 ml_open_file(buf); | |
| 941 | |
| 942 /* only if there is a swapfile */ | |
| 943 if (mfp->mf_fd >= 0) | |
| 944 { | |
| 945 for (hp = mfp->mf_used_last; hp != NULL; ) | |
| 946 { | |
| 947 if (!(hp->bh_flags & BH_LOCKED) | |
| 948 && (!(hp->bh_flags & BH_DIRTY) | |
| 949 || mf_write(mfp, hp) != FAIL)) | |
| 950 { | |
| 951 mf_rem_used(mfp, hp); | |
| 952 mf_rem_hash(mfp, hp); | |
| 953 mf_free_bhdr(hp); | |
| 954 hp = mfp->mf_used_last; /* re-start, list was changed */ | |
| 955 retval = TRUE; | |
| 956 } | |
| 957 else | |
| 958 hp = hp->bh_prev; | |
| 959 } | |
| 960 } | |
| 961 } | |
| 962 } | |
| 963 return retval; | |
| 964 } | |
| 965 | |
| 966 /* | |
| 967 * Allocate a block header and a block of memory for it | |
| 968 */ | |
| 969 static bhdr_T * | |
| 970 mf_alloc_bhdr(mfp, page_count) | |
| 971 memfile_T *mfp; | |
| 972 int page_count; | |
| 973 { | |
| 974 bhdr_T *hp; | |
| 975 | |
| 976 if ((hp = (bhdr_T *)alloc((unsigned)sizeof(bhdr_T))) != NULL) | |
| 977 { | |
| 978 if ((hp->bh_data = (char_u *)alloc(mfp->mf_page_size * page_count)) | |
| 979 == NULL) | |
| 980 { | |
| 981 vim_free(hp); /* not enough memory */ | |
| 982 return NULL; | |
| 983 } | |
| 984 hp->bh_page_count = page_count; | |
| 985 } | |
| 986 return hp; | |
| 987 } | |
| 988 | |
| 989 /* | |
| 990 * Free a block header and the block of memory for it | |
| 991 */ | |
| 992 static void | |
| 993 mf_free_bhdr(hp) | |
| 994 bhdr_T *hp; | |
| 995 { | |
| 996 vim_free(hp->bh_data); | |
| 997 vim_free(hp); | |
| 998 } | |
| 999 | |
| 1000 /* | |
| 1001 * insert entry *hp in the free list | |
| 1002 */ | |
| 1003 static void | |
| 1004 mf_ins_free(mfp, hp) | |
| 1005 memfile_T *mfp; | |
| 1006 bhdr_T *hp; | |
| 1007 { | |
| 1008 hp->bh_next = mfp->mf_free_first; | |
| 1009 mfp->mf_free_first = hp; | |
| 1010 } | |
| 1011 | |
| 1012 /* | |
| 1013 * remove the first entry from the free list and return a pointer to it | |
| 1014 * Note: caller must check that mfp->mf_free_first is not NULL! | |
| 1015 */ | |
| 1016 static bhdr_T * | |
| 1017 mf_rem_free(mfp) | |
| 1018 memfile_T *mfp; | |
| 1019 { | |
| 1020 bhdr_T *hp; | |
| 1021 | |
| 1022 hp = mfp->mf_free_first; | |
| 1023 mfp->mf_free_first = hp->bh_next; | |
| 1024 return hp; | |
| 1025 } | |
| 1026 | |
| 1027 /* | |
| 1028 * read a block from disk | |
| 1029 * | |
| 1030 * Return FAIL for failure, OK otherwise | |
| 1031 */ | |
| 1032 static int | |
| 1033 mf_read(mfp, hp) | |
| 1034 memfile_T *mfp; | |
| 1035 bhdr_T *hp; | |
| 1036 { | |
| 1037 off_t offset; | |
| 1038 unsigned page_size; | |
| 1039 unsigned size; | |
| 1040 | |
| 1041 if (mfp->mf_fd < 0) /* there is no file, can't read */ | |
| 1042 return FAIL; | |
| 1043 | |
| 1044 page_size = mfp->mf_page_size; | |
| 1045 offset = (off_t)page_size * hp->bh_bnum; | |
| 1046 size = page_size * hp->bh_page_count; | |
| 1047 if (lseek(mfp->mf_fd, offset, SEEK_SET) != offset) | |
| 1048 { | |
| 1033 | 1049 PERROR(_("E294: Seek error in swap file read")); |
| 7 | 1050 return FAIL; |
| 1051 } | |
| 1052 if ((unsigned)vim_read(mfp->mf_fd, hp->bh_data, size) != size) | |
| 1053 { | |
| 1033 | 1054 PERROR(_("E295: Read error in swap file")); |
| 7 | 1055 return FAIL; |
| 1056 } | |
| 2267 | 1057 |
| 1058 #ifdef FEAT_CRYPT | |
| 1059 /* Decrypt if 'key' is set and this is a data block. */ | |
| 1060 if (*mfp->mf_buffer->b_p_key != NUL) | |
| 1061 ml_decrypt_data(mfp, hp->bh_data, offset, size); | |
| 1062 #endif | |
| 1063 | |
| 7 | 1064 return OK; |
| 1065 } | |
| 1066 | |
| 1067 /* | |
| 1068 * write a block to disk | |
| 1069 * | |
| 1070 * Return FAIL for failure, OK otherwise | |
| 1071 */ | |
| 1072 static int | |
| 1073 mf_write(mfp, hp) | |
| 1074 memfile_T *mfp; | |
| 1075 bhdr_T *hp; | |
| 1076 { | |
| 1077 off_t offset; /* offset in the file */ | |
| 1078 blocknr_T nr; /* block nr which is being written */ | |
| 1079 bhdr_T *hp2; | |
| 1080 unsigned page_size; /* number of bytes in a page */ | |
| 1081 unsigned page_count; /* number of pages written */ | |
| 1082 unsigned size; /* number of bytes written */ | |
| 1083 | |
| 1084 if (mfp->mf_fd < 0) /* there is no file, can't write */ | |
| 1085 return FAIL; | |
| 1086 | |
| 1087 if (hp->bh_bnum < 0) /* must assign file block number */ | |
| 1088 if (mf_trans_add(mfp, hp) == FAIL) | |
| 1089 return FAIL; | |
| 1090 | |
| 1091 page_size = mfp->mf_page_size; | |
| 1092 | |
| 1093 /* | |
| 1094 * We don't want gaps in the file. Write the blocks in front of *hp | |
| 1095 * to extend the file. | |
| 1096 * If block 'mf_infile_count' is not in the hash list, it has been | |
| 1097 * freed. Fill the space in the file with data from the current block. | |
| 1098 */ | |
| 1099 for (;;) | |
| 1100 { | |
| 1101 nr = hp->bh_bnum; | |
| 1102 if (nr > mfp->mf_infile_count) /* beyond end of file */ | |
| 1103 { | |
| 1104 nr = mfp->mf_infile_count; | |
| 1105 hp2 = mf_find_hash(mfp, nr); /* NULL catched below */ | |
| 1106 } | |
| 1107 else | |
| 1108 hp2 = hp; | |
| 1109 | |
| 1110 offset = (off_t)page_size * nr; | |
| 1111 if (lseek(mfp->mf_fd, offset, SEEK_SET) != offset) | |
| 1112 { | |
| 1033 | 1113 PERROR(_("E296: Seek error in swap file write")); |
| 7 | 1114 return FAIL; |
| 1115 } | |
| 1116 if (hp2 == NULL) /* freed block, fill with dummy data */ | |
| 1117 page_count = 1; | |
| 1118 else | |
| 1119 page_count = hp2->bh_page_count; | |
| 1120 size = page_size * page_count; | |
| 2267 | 1121 if (mf_write_block(mfp, hp2 == NULL ? hp : hp2, offset, size) == FAIL) |
| 7 | 1122 { |
| 1123 /* | |
| 1124 * Avoid repeating the error message, this mostly happens when the | |
| 1226 | 1125 * disk is full. We give the message again only after a successful |
| 7 | 1126 * write or when hitting a key. We keep on trying, in case some |
| 1127 * space becomes available. | |
| 1128 */ | |
| 1129 if (!did_swapwrite_msg) | |
| 1130 EMSG(_("E297: Write error in swap file")); | |
| 1131 did_swapwrite_msg = TRUE; | |
| 1132 return FAIL; | |
| 1133 } | |
| 1134 did_swapwrite_msg = FALSE; | |
| 1135 if (hp2 != NULL) /* written a non-dummy block */ | |
| 1136 hp2->bh_flags &= ~BH_DIRTY; | |
| 1137 /* appended to the file */ | |
| 1138 if (nr + (blocknr_T)page_count > mfp->mf_infile_count) | |
| 1139 mfp->mf_infile_count = nr + page_count; | |
| 1140 if (nr == hp->bh_bnum) /* written the desired block */ | |
| 1141 break; | |
| 1142 } | |
| 1143 return OK; | |
| 1144 } | |
| 1145 | |
| 1146 /* | |
| 2267 | 1147 * Write block "hp" with data size "size" to file "mfp->mf_fd". |
| 1148 * Takes care of encryption. | |
| 1149 * Return FAIL or OK. | |
| 1150 */ | |
| 1151 static int | |
| 1152 mf_write_block(mfp, hp, offset, size) | |
| 1153 memfile_T *mfp; | |
| 1154 bhdr_T *hp; | |
| 1155 off_t offset UNUSED; | |
| 1156 unsigned size; | |
| 1157 { | |
| 1158 char_u *data = hp->bh_data; | |
| 1159 int result = OK; | |
| 1160 | |
| 1161 #ifdef FEAT_CRYPT | |
| 1162 /* Encrypt if 'key' is set and this is a data block. */ | |
| 1163 if (*mfp->mf_buffer->b_p_key != NUL) | |
| 1164 { | |
| 1165 data = ml_encrypt_data(mfp, data, offset, size); | |
| 1166 if (data == NULL) | |
| 1167 return FAIL; | |
| 1168 } | |
| 1169 #endif | |
| 1170 | |
| 1171 if ((unsigned)vim_write(mfp->mf_fd, data, size) != size) | |
| 1172 result = FAIL; | |
| 1173 | |
| 1174 #ifdef FEAT_CRYPT | |
| 1175 if (data != hp->bh_data) | |
| 1176 vim_free(data); | |
| 1177 #endif | |
| 1178 | |
| 1179 return result; | |
| 1180 } | |
| 1181 | |
| 1182 /* | |
| 7 | 1183 * Make block number for *hp positive and add it to the translation list |
| 1184 * | |
| 1185 * Return FAIL for failure, OK otherwise | |
| 1186 */ | |
| 1187 static int | |
| 1188 mf_trans_add(mfp, hp) | |
| 1189 memfile_T *mfp; | |
| 1190 bhdr_T *hp; | |
| 1191 { | |
| 1192 bhdr_T *freep; | |
| 1193 blocknr_T new_bnum; | |
| 1194 int hash; | |
| 1195 NR_TRANS *np; | |
| 1196 int page_count; | |
| 1197 | |
| 1198 if (hp->bh_bnum >= 0) /* it's already positive */ | |
| 1199 return OK; | |
| 1200 | |
| 1201 if ((np = (NR_TRANS *)alloc((unsigned)sizeof(NR_TRANS))) == NULL) | |
| 1202 return FAIL; | |
| 1203 | |
| 1204 /* | |
| 2267 | 1205 * Get a new number for the block. |
| 7 | 1206 * If the first item in the free list has sufficient pages, use its number |
| 1207 * Otherwise use mf_blocknr_max. | |
| 1208 */ | |
| 1209 freep = mfp->mf_free_first; | |
| 1210 page_count = hp->bh_page_count; | |
| 1211 if (freep != NULL && freep->bh_page_count >= page_count) | |
| 1212 { | |
| 1213 new_bnum = freep->bh_bnum; | |
| 1214 /* | |
| 1215 * If the page count of the free block was larger, recude it. | |
| 1216 * If the page count matches, remove the block from the free list | |
| 1217 */ | |
| 1218 if (freep->bh_page_count > page_count) | |
| 1219 { | |
| 1220 freep->bh_bnum += page_count; | |
| 1221 freep->bh_page_count -= page_count; | |
| 1222 } | |
| 1223 else | |
| 1224 { | |
| 1225 freep = mf_rem_free(mfp); | |
| 1226 vim_free(freep); | |
| 1227 } | |
| 1228 } | |
| 1229 else | |
| 1230 { | |
| 1231 new_bnum = mfp->mf_blocknr_max; | |
| 1232 mfp->mf_blocknr_max += page_count; | |
| 1233 } | |
| 1234 | |
| 1235 np->nt_old_bnum = hp->bh_bnum; /* adjust number */ | |
| 1236 np->nt_new_bnum = new_bnum; | |
| 1237 | |
| 1238 mf_rem_hash(mfp, hp); /* remove from old hash list */ | |
| 1239 hp->bh_bnum = new_bnum; | |
| 1240 mf_ins_hash(mfp, hp); /* insert in new hash list */ | |
| 1241 | |
| 1242 hash = MEMHASH(np->nt_old_bnum); /* insert in trans list */ | |
| 1243 np->nt_next = mfp->mf_trans[hash]; | |
| 1244 mfp->mf_trans[hash] = np; | |
| 1245 if (np->nt_next != NULL) | |
| 1246 np->nt_next->nt_prev = np; | |
| 1247 np->nt_prev = NULL; | |
| 1248 | |
| 1249 return OK; | |
| 1250 } | |
| 1251 | |
| 1252 /* | |
| 1226 | 1253 * Lookup a translation from the trans lists and delete the entry |
| 7 | 1254 * |
| 1255 * Return the positive new number when found, the old number when not found | |
| 1256 */ | |
| 1257 blocknr_T | |
| 1258 mf_trans_del(mfp, old_nr) | |
| 1259 memfile_T *mfp; | |
| 1260 blocknr_T old_nr; | |
| 1261 { | |
| 1262 int hash; | |
| 1263 NR_TRANS *np; | |
| 1264 blocknr_T new_bnum; | |
| 1265 | |
| 1266 hash = MEMHASH(old_nr); | |
| 1267 for (np = mfp->mf_trans[hash]; np != NULL; np = np->nt_next) | |
| 1268 if (np->nt_old_bnum == old_nr) | |
| 1269 break; | |
| 1270 if (np == NULL) /* not found */ | |
| 1271 return old_nr; | |
| 1272 | |
| 1273 mfp->mf_neg_count--; | |
| 1274 new_bnum = np->nt_new_bnum; | |
| 1275 if (np->nt_prev != NULL) /* remove entry from the trans list */ | |
| 1276 np->nt_prev->nt_next = np->nt_next; | |
| 1277 else | |
| 1278 mfp->mf_trans[hash] = np->nt_next; | |
| 1279 if (np->nt_next != NULL) | |
| 1280 np->nt_next->nt_prev = np->nt_prev; | |
| 1281 vim_free(np); | |
| 1282 | |
| 1283 return new_bnum; | |
| 1284 } | |
| 1285 | |
| 1286 /* | |
| 1287 * Set mfp->mf_ffname according to mfp->mf_fname and some other things. | |
| 1288 * Only called when creating or renaming the swapfile. Either way it's a new | |
| 1289 * name so we must work out the full path name. | |
| 1290 */ | |
| 1291 void | |
| 1292 mf_set_ffname(mfp) | |
| 1293 memfile_T *mfp; | |
| 1294 { | |
| 1295 mfp->mf_ffname = FullName_save(mfp->mf_fname, FALSE); | |
| 1296 } | |
| 1297 | |
| 1298 /* | |
| 1299 * Make the name of the file used for the memfile a full path. | |
| 1300 * Used before doing a :cd | |
| 1301 */ | |
| 1302 void | |
| 1303 mf_fullname(mfp) | |
| 1304 memfile_T *mfp; | |
| 1305 { | |
| 1306 if (mfp != NULL && mfp->mf_fname != NULL && mfp->mf_ffname != NULL) | |
| 1307 { | |
| 1308 vim_free(mfp->mf_fname); | |
| 1309 mfp->mf_fname = mfp->mf_ffname; | |
| 1310 mfp->mf_ffname = NULL; | |
| 1311 } | |
| 1312 } | |
| 1313 | |
| 1314 /* | |
| 1315 * return TRUE if there are any translations pending for 'mfp' | |
| 1316 */ | |
| 1317 int | |
| 1318 mf_need_trans(mfp) | |
| 1319 memfile_T *mfp; | |
| 1320 { | |
| 1321 return (mfp->mf_fname != NULL && mfp->mf_neg_count > 0); | |
| 1322 } | |
| 1323 | |
| 1324 /* | |
| 1325 * Open a swap file for a memfile. | |
| 1326 * The "fname" must be in allocated memory, and is consumed (also when an | |
| 1327 * error occurs). | |
| 1328 */ | |
| 1329 static void | |
| 1330 mf_do_open(mfp, fname, flags) | |
| 1331 memfile_T *mfp; | |
| 1332 char_u *fname; | |
| 1333 int flags; /* flags for open() */ | |
| 1334 { | |
| 1335 #ifdef HAVE_LSTAT | |
| 1336 struct stat sb; | |
| 1337 #endif | |
| 1338 | |
| 1339 mfp->mf_fname = fname; | |
| 1340 | |
| 1341 /* | |
| 1342 * Get the full path name before the open, because this is | |
| 1343 * not possible after the open on the Amiga. | |
| 1344 * fname cannot be NameBuff, because it must have been allocated. | |
| 1345 */ | |
| 1346 mf_set_ffname(mfp); | |
| 1347 #if defined(MSDOS) || defined(MSWIN) || defined(RISCOS) | |
| 1348 /* | |
| 1349 * A ":!cd e:xxx" may change the directory without us knowning, use the | |
| 1350 * full pathname always. Careful: This frees fname! | |
| 1351 */ | |
| 1352 mf_fullname(mfp); | |
| 1353 #endif | |
| 1354 | |
| 1355 #ifdef HAVE_LSTAT | |
| 1356 /* | |
| 1357 * Extra security check: When creating a swap file it really shouldn't | |
| 1358 * exist yet. If there is a symbolic link, this is most likely an attack. | |
| 1359 */ | |
| 1360 if ((flags & O_CREAT) && mch_lstat((char *)mfp->mf_fname, &sb) >= 0) | |
| 1361 { | |
| 1362 mfp->mf_fd = -1; | |
| 1363 EMSG(_("E300: Swap file already exists (symlink attack?)")); | |
| 1364 } | |
| 1365 else | |
| 1366 #endif | |
| 1367 { | |
| 1368 /* | |
| 1369 * try to open the file | |
| 1370 */ | |
| 557 | 1371 flags |= O_EXTRA | O_NOFOLLOW; |
| 7 | 1372 #ifdef WIN32 |
| 1373 /* Prevent handle inheritance that cause problems with Cscope | |
| 1374 * (swap file may not be deleted if cscope connection was open after | |
| 1375 * the file) */ | |
| 1376 flags |= O_NOINHERIT; | |
| 1377 #endif | |
| 1378 mfp->mf_fd = mch_open_rw((char *)mfp->mf_fname, flags); | |
| 1379 } | |
| 1380 | |
| 1381 /* | |
| 1382 * If the file cannot be opened, use memory only | |
| 1383 */ | |
| 1384 if (mfp->mf_fd < 0) | |
| 1385 { | |
| 1386 vim_free(mfp->mf_fname); | |
| 1387 vim_free(mfp->mf_ffname); | |
| 1388 mfp->mf_fname = NULL; | |
| 1389 mfp->mf_ffname = NULL; | |
| 1390 } | |
| 1391 else | |
| 1583 | 1392 { |
| 2003 | 1393 #ifdef HAVE_FD_CLOEXEC |
| 1394 int fdflags = fcntl(mfp->mf_fd, F_GETFD); | |
| 1395 if (fdflags >= 0 && (fdflags & FD_CLOEXEC) == 0) | |
| 1396 fcntl(mfp->mf_fd, F_SETFD, fdflags | FD_CLOEXEC); | |
| 1397 #endif | |
| 1583 | 1398 #ifdef HAVE_SELINUX |
| 1399 mch_copy_sec(fname, mfp->mf_fname); | |
| 1400 #endif | |
| 7 | 1401 mch_hide(mfp->mf_fname); /* try setting the 'hidden' flag */ |
| 1583 | 1402 } |
| 7 | 1403 } |