Mercurial > vim
annotate src/memfile.c @ 18478:94223687df0e
Added tag v8.1.2233 for changeset e93cab5d0f0f27fad7882f1f412927df055b090d
| author | Bram Moolenaar <Bram@vim.org> |
|---|---|
| date | Tue, 29 Oct 2019 04:30:05 +0100 |
| parents | ce04ebdf26b8 |
| children | f41b55f9357c |
| rev | line source |
|---|---|
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commit https://github.com/vim/vim/commit/edf3f97ae2af024708ebb4ac614227327033ca47
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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 # ifdef __MINT__ /* do we still need this? */ | |
| 50 # define fstatfs(fd, buf, len, nul) mch_fstat((fd), (buf)) | |
| 51 # endif | |
| 52 # endif | |
| 53 #endif | |
| 54 | |
| 55 /* | |
| 56 * for Amiga Dos 2.0x we use Flush | |
| 57 */ | |
| 58 #ifdef AMIGA | |
| 59 # ifdef FEAT_ARP | |
| 60 extern int dos2; /* this is in os_amiga.c */ | |
| 61 # endif | |
| 62 # ifdef SASC | |
| 63 # include <proto/dos.h> | |
| 64 # include <ios1.h> /* for chkufb() */ | |
| 65 # endif | |
| 66 #endif | |
| 67 | |
| 68 #define MEMFILE_PAGE_SIZE 4096 /* default page size */ | |
| 69 | |
| 70 static long_u total_mem_used = 0; /* total memory used for memfiles */ | |
| 71 | |
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72 static void mf_ins_hash(memfile_T *, bhdr_T *); |
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73 static void mf_rem_hash(memfile_T *, bhdr_T *); |
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74 static bhdr_T *mf_find_hash(memfile_T *, blocknr_T); |
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75 static void mf_ins_used(memfile_T *, bhdr_T *); |
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76 static void mf_rem_used(memfile_T *, bhdr_T *); |
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77 static bhdr_T *mf_release(memfile_T *, int); |
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78 static bhdr_T *mf_alloc_bhdr(memfile_T *, int); |
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79 static void mf_free_bhdr(bhdr_T *); |
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80 static void mf_ins_free(memfile_T *, bhdr_T *); |
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81 static bhdr_T *mf_rem_free(memfile_T *); |
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82 static int mf_read(memfile_T *, bhdr_T *); |
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83 static int mf_write(memfile_T *, bhdr_T *); |
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84 static int mf_write_block(memfile_T *mfp, bhdr_T *hp, off_T offset, unsigned size); |
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85 static int mf_trans_add(memfile_T *, bhdr_T *); |
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86 static void mf_do_open(memfile_T *, char_u *, int); |
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87 static void mf_hash_init(mf_hashtab_T *); |
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88 static void mf_hash_free(mf_hashtab_T *); |
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89 static void mf_hash_free_all(mf_hashtab_T *); |
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90 static mf_hashitem_T *mf_hash_find(mf_hashtab_T *, blocknr_T); |
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91 static void mf_hash_add_item(mf_hashtab_T *, mf_hashitem_T *); |
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92 static void mf_hash_rem_item(mf_hashtab_T *, mf_hashitem_T *); |
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93 static int mf_hash_grow(mf_hashtab_T *); |
| 7 | 94 |
| 95 /* | |
| 96 * The functions for using a memfile: | |
| 97 * | |
| 98 * mf_open() open a new or existing memfile | |
| 99 * mf_open_file() open a swap file for an existing memfile | |
| 100 * mf_close() close (and delete) a memfile | |
| 101 * mf_new() create a new block in a memfile and lock it | |
| 102 * mf_get() get an existing block and lock it | |
| 103 * mf_put() unlock a block, may be marked for writing | |
| 104 * mf_free() remove a block | |
| 105 * mf_sync() sync changed parts of memfile to disk | |
| 106 * mf_release_all() release as much memory as possible | |
| 107 * mf_trans_del() may translate negative to positive block number | |
| 108 * mf_fullname() make file name full path (use before first :cd) | |
| 109 */ | |
| 110 | |
| 111 /* | |
| 112 * Open an existing or new memory block file. | |
| 113 * | |
| 114 * fname: name of file to use (NULL means no file at all) | |
| 115 * Note: fname must have been allocated, it is not copied! | |
| 116 * If opening the file fails, fname is freed. | |
| 117 * flags: flags for open() call | |
| 118 * | |
| 119 * If fname != NULL and file cannot be opened, fail. | |
| 120 * | |
| 121 * return value: identifier for this memory block file. | |
| 122 */ | |
| 123 memfile_T * | |
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124 mf_open(char_u *fname, int flags) |
| 7 | 125 { |
| 126 memfile_T *mfp; | |
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127 off_T size; |
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128 #if defined(STATFS) && defined(UNIX) && !defined(__QNX__) && !defined(__minix) |
| 7 | 129 # define USE_FSTATFS |
| 130 struct STATFS stf; | |
| 131 #endif | |
| 132 | |
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133 if ((mfp = ALLOC_ONE(memfile_T)) == NULL) |
| 7 | 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; | |
| 2730 | 159 mf_hash_init(&mfp->mf_hash); |
| 160 mf_hash_init(&mfp->mf_trans); | |
| 7 | 161 mfp->mf_page_size = MEMFILE_PAGE_SIZE; |
| 2267 | 162 #ifdef FEAT_CRYPT |
| 163 mfp->mf_old_key = NULL; | |
| 164 #endif | |
| 7 | 165 |
| 166 #ifdef USE_FSTATFS | |
| 167 /* | |
| 168 * Try to set the page size equal to the block size of the device. | |
| 169 * Speeds up I/O a lot. | |
| 170 * When recovering, the actual block size will be retrieved from block 0 | |
| 171 * in ml_recover(). The size used here may be wrong, therefore | |
| 172 * mf_blocknr_max must be rounded up. | |
| 173 */ | |
| 174 if (mfp->mf_fd >= 0 | |
| 175 && fstatfs(mfp->mf_fd, &stf, sizeof(struct statfs), 0) == 0 | |
| 176 && stf.F_BSIZE >= MIN_SWAP_PAGE_SIZE | |
| 177 && stf.F_BSIZE <= MAX_SWAP_PAGE_SIZE) | |
| 178 mfp->mf_page_size = stf.F_BSIZE; | |
| 179 #endif | |
| 180 | |
| 181 if (mfp->mf_fd < 0 || (flags & (O_TRUNC|O_EXCL)) | |
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182 || (size = vim_lseek(mfp->mf_fd, (off_T)0L, SEEK_END)) <= 0) |
| 7 | 183 mfp->mf_blocknr_max = 0; /* no file or empty file */ |
| 184 else | |
| 185 mfp->mf_blocknr_max = (blocknr_T)((size + mfp->mf_page_size - 1) | |
| 186 / mfp->mf_page_size); | |
| 187 mfp->mf_blocknr_min = -1; | |
| 188 mfp->mf_neg_count = 0; | |
| 189 mfp->mf_infile_count = mfp->mf_blocknr_max; | |
| 1230 | 190 |
| 191 /* | |
| 192 * Compute maximum number of pages ('maxmem' is in Kbyte): | |
| 193 * 'mammem' * 1Kbyte / page-size-in-bytes. | |
| 194 * Avoid overflow by first reducing page size as much as possible. | |
| 195 */ | |
| 196 { | |
| 197 int shift = 10; | |
| 198 unsigned page_size = mfp->mf_page_size; | |
| 199 | |
| 200 while (shift > 0 && (page_size & 1) == 0) | |
| 201 { | |
| 202 page_size = page_size >> 1; | |
| 203 --shift; | |
| 204 } | |
| 205 mfp->mf_used_count_max = (p_mm << shift) / page_size; | |
| 206 if (mfp->mf_used_count_max < 10) | |
| 207 mfp->mf_used_count_max = 10; | |
| 208 } | |
| 7 | 209 |
| 210 return mfp; | |
| 211 } | |
| 212 | |
| 213 /* | |
| 214 * Open a file for an existing memfile. Used when updatecount set from 0 to | |
| 215 * some value. | |
| 216 * If the file already exists, this fails. | |
| 217 * "fname" is the name of file to use (NULL means no file at all) | |
| 218 * Note: "fname" must have been allocated, it is not copied! If opening the | |
| 219 * file fails, "fname" is freed. | |
| 220 * | |
| 221 * return value: FAIL if file could not be opened, OK otherwise | |
| 222 */ | |
| 223 int | |
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224 mf_open_file(memfile_T *mfp, char_u *fname) |
| 7 | 225 { |
| 226 mf_do_open(mfp, fname, O_RDWR|O_CREAT|O_EXCL); /* try to open the file */ | |
| 227 | |
| 228 if (mfp->mf_fd < 0) | |
| 229 return FAIL; | |
| 230 | |
| 231 mfp->mf_dirty = TRUE; | |
| 232 return OK; | |
| 233 } | |
| 234 | |
| 235 /* | |
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236 * Close a memory file and delete the associated file if 'del_file' is TRUE. |
| 7 | 237 */ |
| 238 void | |
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239 mf_close(memfile_T *mfp, int del_file) |
| 7 | 240 { |
| 241 bhdr_T *hp, *nextp; | |
| 242 | |
| 243 if (mfp == NULL) /* safety check */ | |
| 244 return; | |
| 245 if (mfp->mf_fd >= 0) | |
| 246 { | |
| 247 if (close(mfp->mf_fd) < 0) | |
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248 emsg(_(e_swapclose)); |
| 7 | 249 } |
| 250 if (del_file && mfp->mf_fname != NULL) | |
| 251 mch_remove(mfp->mf_fname); | |
| 252 /* free entries in used list */ | |
| 253 for (hp = mfp->mf_used_first; hp != NULL; hp = nextp) | |
| 254 { | |
| 255 total_mem_used -= hp->bh_page_count * mfp->mf_page_size; | |
| 256 nextp = hp->bh_next; | |
| 257 mf_free_bhdr(hp); | |
| 258 } | |
| 259 while (mfp->mf_free_first != NULL) /* free entries in free list */ | |
| 260 vim_free(mf_rem_free(mfp)); | |
| 2730 | 261 mf_hash_free(&mfp->mf_hash); |
| 262 mf_hash_free_all(&mfp->mf_trans); /* free hashtable and its items */ | |
| 7 | 263 vim_free(mfp->mf_fname); |
| 264 vim_free(mfp->mf_ffname); | |
| 265 vim_free(mfp); | |
| 266 } | |
| 267 | |
| 268 /* | |
| 269 * Close the swap file for a memfile. Used when 'swapfile' is reset. | |
| 270 */ | |
| 271 void | |
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272 mf_close_file( |
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273 buf_T *buf, |
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274 int getlines) /* get all lines into memory? */ |
| 7 | 275 { |
| 276 memfile_T *mfp; | |
| 277 linenr_T lnum; | |
| 278 | |
| 279 mfp = buf->b_ml.ml_mfp; | |
| 280 if (mfp == NULL || mfp->mf_fd < 0) /* nothing to close */ | |
| 281 return; | |
| 282 | |
| 283 if (getlines) | |
| 284 { | |
| 285 /* get all blocks in memory by accessing all lines (clumsy!) */ | |
| 1066 | 286 mf_dont_release = TRUE; |
| 7 | 287 for (lnum = 1; lnum <= buf->b_ml.ml_line_count; ++lnum) |
| 288 (void)ml_get_buf(buf, lnum, FALSE); | |
| 1066 | 289 mf_dont_release = FALSE; |
| 7 | 290 /* TODO: should check if all blocks are really in core */ |
| 291 } | |
| 292 | |
| 293 if (close(mfp->mf_fd) < 0) /* close the file */ | |
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294 emsg(_(e_swapclose)); |
| 7 | 295 mfp->mf_fd = -1; |
| 296 | |
| 297 if (mfp->mf_fname != NULL) | |
| 298 { | |
| 299 mch_remove(mfp->mf_fname); /* delete the swap file */ | |
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300 VIM_CLEAR(mfp->mf_fname); |
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301 VIM_CLEAR(mfp->mf_ffname); |
| 7 | 302 } |
| 303 } | |
| 304 | |
| 305 /* | |
| 306 * Set new size for a memfile. Used when block 0 of a swapfile has been read | |
| 307 * and the size it indicates differs from what was guessed. | |
| 308 */ | |
| 309 void | |
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310 mf_new_page_size(memfile_T *mfp, unsigned new_size) |
| 7 | 311 { |
| 312 /* Correct the memory used for block 0 to the new size, because it will be | |
| 313 * freed with that size later on. */ | |
| 314 total_mem_used += new_size - mfp->mf_page_size; | |
| 315 mfp->mf_page_size = new_size; | |
| 316 } | |
| 317 | |
| 318 /* | |
| 319 * get a new block | |
| 320 * | |
| 321 * negative: TRUE if negative block number desired (data block) | |
| 322 */ | |
| 323 bhdr_T * | |
|
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324 mf_new(memfile_T *mfp, int negative, int page_count) |
| 7 | 325 { |
| 1166 | 326 bhdr_T *hp; /* new bhdr_T */ |
| 327 bhdr_T *freep; /* first block in free list */ | |
| 328 char_u *p; | |
| 7 | 329 |
| 330 /* | |
| 331 * If we reached the maximum size for the used memory blocks, release one | |
| 332 * If a bhdr_T is returned, use it and adjust the page_count if necessary. | |
| 333 */ | |
| 334 hp = mf_release(mfp, page_count); | |
| 335 | |
| 336 /* | |
| 337 * Decide on the number to use: | |
| 338 * If there is a free block, use its number. | |
| 339 * Otherwise use mf_block_min for a negative number, mf_block_max for | |
| 340 * a positive number. | |
| 341 */ | |
| 342 freep = mfp->mf_free_first; | |
| 343 if (!negative && freep != NULL && freep->bh_page_count >= page_count) | |
| 344 { | |
| 345 /* | |
| 346 * If the block in the free list has more pages, take only the number | |
| 347 * of pages needed and allocate a new bhdr_T with data | |
| 348 * | |
| 1166 | 349 * If the number of pages matches and mf_release() did not return a |
| 350 * bhdr_T, use the bhdr_T from the free list and allocate the data | |
| 7 | 351 * |
| 1166 | 352 * If the number of pages matches and mf_release() returned a bhdr_T, |
| 7 | 353 * just use the number and free the bhdr_T from the free list |
| 354 */ | |
| 355 if (freep->bh_page_count > page_count) | |
| 356 { | |
| 357 if (hp == NULL && (hp = mf_alloc_bhdr(mfp, page_count)) == NULL) | |
| 358 return NULL; | |
| 359 hp->bh_bnum = freep->bh_bnum; | |
| 360 freep->bh_bnum += page_count; | |
| 361 freep->bh_page_count -= page_count; | |
| 362 } | |
| 363 else if (hp == NULL) /* need to allocate memory for this block */ | |
| 364 { | |
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365 if ((p = alloc(mfp->mf_page_size * page_count)) == NULL) |
| 7 | 366 return NULL; |
| 367 hp = mf_rem_free(mfp); | |
| 368 hp->bh_data = p; | |
| 369 } | |
| 370 else /* use the number, remove entry from free list */ | |
| 371 { | |
| 372 freep = mf_rem_free(mfp); | |
| 373 hp->bh_bnum = freep->bh_bnum; | |
| 374 vim_free(freep); | |
| 375 } | |
| 376 } | |
| 377 else /* get a new number */ | |
| 378 { | |
| 379 if (hp == NULL && (hp = mf_alloc_bhdr(mfp, page_count)) == NULL) | |
| 380 return NULL; | |
| 381 if (negative) | |
| 382 { | |
| 383 hp->bh_bnum = mfp->mf_blocknr_min--; | |
| 384 mfp->mf_neg_count++; | |
| 385 } | |
| 386 else | |
| 387 { | |
| 388 hp->bh_bnum = mfp->mf_blocknr_max; | |
| 389 mfp->mf_blocknr_max += page_count; | |
| 390 } | |
| 391 } | |
| 392 hp->bh_flags = BH_LOCKED | BH_DIRTY; /* new block is always dirty */ | |
| 393 mfp->mf_dirty = TRUE; | |
| 394 hp->bh_page_count = page_count; | |
| 395 mf_ins_used(mfp, hp); | |
| 396 mf_ins_hash(mfp, hp); | |
| 397 | |
| 398 /* | |
| 399 * Init the data to all zero, to avoid reading uninitialized data. | |
| 400 * This also avoids that the passwd file ends up in the swap file! | |
| 401 */ | |
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402 (void)vim_memset((char *)(hp->bh_data), 0, |
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403 (size_t)mfp->mf_page_size * page_count); |
| 7 | 404 |
| 405 return hp; | |
| 406 } | |
| 407 | |
| 408 /* | |
| 2267 | 409 * Get existing block "nr" with "page_count" pages. |
| 7 | 410 * |
| 411 * Note: The caller should first check a negative nr with mf_trans_del() | |
| 412 */ | |
| 413 bhdr_T * | |
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414 mf_get(memfile_T *mfp, blocknr_T nr, int page_count) |
| 7 | 415 { |
| 416 bhdr_T *hp; | |
| 417 /* doesn't exist */ | |
| 418 if (nr >= mfp->mf_blocknr_max || nr <= mfp->mf_blocknr_min) | |
| 419 return NULL; | |
| 420 | |
| 421 /* | |
| 422 * see if it is in the cache | |
| 423 */ | |
| 424 hp = mf_find_hash(mfp, nr); | |
| 425 if (hp == NULL) /* not in the hash list */ | |
| 426 { | |
| 427 if (nr < 0 || nr >= mfp->mf_infile_count) /* can't be in the file */ | |
| 428 return NULL; | |
| 429 | |
| 430 /* could check here if the block is in the free list */ | |
| 431 | |
| 432 /* | |
| 433 * Check if we need to flush an existing block. | |
| 434 * If so, use that block. | |
| 435 * If not, allocate a new block. | |
| 436 */ | |
| 437 hp = mf_release(mfp, page_count); | |
| 438 if (hp == NULL && (hp = mf_alloc_bhdr(mfp, page_count)) == NULL) | |
| 439 return NULL; | |
| 440 | |
| 441 hp->bh_bnum = nr; | |
| 442 hp->bh_flags = 0; | |
| 443 hp->bh_page_count = page_count; | |
| 444 if (mf_read(mfp, hp) == FAIL) /* cannot read the block! */ | |
| 445 { | |
| 446 mf_free_bhdr(hp); | |
| 447 return NULL; | |
| 448 } | |
| 449 } | |
| 450 else | |
| 451 { | |
| 452 mf_rem_used(mfp, hp); /* remove from list, insert in front below */ | |
| 453 mf_rem_hash(mfp, hp); | |
| 454 } | |
| 455 | |
| 456 hp->bh_flags |= BH_LOCKED; | |
| 457 mf_ins_used(mfp, hp); /* put in front of used list */ | |
| 458 mf_ins_hash(mfp, hp); /* put in front of hash list */ | |
| 459 | |
| 460 return hp; | |
| 461 } | |
| 462 | |
| 463 /* | |
| 464 * release the block *hp | |
| 465 * | |
| 466 * dirty: Block must be written to file later | |
| 467 * infile: Block should be in file (needed for recovery) | |
| 468 * | |
| 469 * no return value, function cannot fail | |
| 470 */ | |
| 471 void | |
|
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472 mf_put( |
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473 memfile_T *mfp, |
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474 bhdr_T *hp, |
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475 int dirty, |
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476 int infile) |
| 7 | 477 { |
| 478 int flags; | |
| 479 | |
| 480 flags = hp->bh_flags; | |
| 481 | |
| 482 if ((flags & BH_LOCKED) == 0) | |
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483 iemsg(_("E293: block was not locked")); |
| 7 | 484 flags &= ~BH_LOCKED; |
| 485 if (dirty) | |
| 486 { | |
| 487 flags |= BH_DIRTY; | |
| 488 mfp->mf_dirty = TRUE; | |
| 489 } | |
| 490 hp->bh_flags = flags; | |
| 491 if (infile) | |
| 492 mf_trans_add(mfp, hp); /* may translate negative in positive nr */ | |
| 493 } | |
| 494 | |
| 495 /* | |
| 496 * block *hp is no longer in used, may put it in the free list of memfile *mfp | |
| 497 */ | |
| 498 void | |
|
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499 mf_free(memfile_T *mfp, bhdr_T *hp) |
| 7 | 500 { |
| 501 vim_free(hp->bh_data); /* free the memory */ | |
| 502 mf_rem_hash(mfp, hp); /* get *hp out of the hash list */ | |
| 503 mf_rem_used(mfp, hp); /* get *hp out of the used list */ | |
| 504 if (hp->bh_bnum < 0) | |
| 505 { | |
| 506 vim_free(hp); /* don't want negative numbers in free list */ | |
| 507 mfp->mf_neg_count--; | |
| 508 } | |
| 509 else | |
| 510 mf_ins_free(mfp, hp); /* put *hp in the free list */ | |
| 511 } | |
| 512 | |
| 984 | 513 #if defined(__MORPHOS__) && defined(__libnix__) |
| 7 | 514 /* function is missing in MorphOS libnix version */ |
| 515 extern unsigned long *__stdfiledes; | |
| 516 | |
| 517 static unsigned long | |
| 518 fdtofh(int filedescriptor) | |
| 519 { | |
| 520 return __stdfiledes[filedescriptor]; | |
| 521 } | |
| 522 #endif | |
| 523 | |
| 524 /* | |
| 525 * Sync the memory file *mfp to disk. | |
| 526 * Flags: | |
| 527 * MFS_ALL If not given, blocks with negative numbers are not synced, | |
| 528 * even when they are dirty! | |
| 529 * MFS_STOP Stop syncing when a character becomes available, but sync at | |
| 530 * least one block. | |
| 531 * MFS_FLUSH Make sure buffers are flushed to disk, so they will survive a | |
| 532 * system crash. | |
| 533 * MFS_ZERO Only write block 0. | |
| 534 * | |
| 535 * Return FAIL for failure, OK otherwise | |
| 536 */ | |
| 537 int | |
|
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538 mf_sync(memfile_T *mfp, int flags) |
| 7 | 539 { |
| 540 int status; | |
| 541 bhdr_T *hp; | |
| 542 int got_int_save = got_int; | |
| 543 | |
| 544 if (mfp->mf_fd < 0) /* there is no file, nothing to do */ | |
| 545 { | |
| 546 mfp->mf_dirty = FALSE; | |
| 547 return FAIL; | |
| 548 } | |
| 549 | |
| 550 /* Only a CTRL-C while writing will break us here, not one typed | |
| 551 * previously. */ | |
| 552 got_int = FALSE; | |
| 553 | |
| 554 /* | |
| 555 * sync from last to first (may reduce the probability of an inconsistent | |
| 556 * file) If a write fails, it is very likely caused by a full filesystem. | |
| 557 * Then we only try to write blocks within the existing file. If that also | |
| 558 * fails then we give up. | |
| 559 */ | |
| 560 status = OK; | |
| 561 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev) | |
| 562 if (((flags & MFS_ALL) || hp->bh_bnum >= 0) | |
| 563 && (hp->bh_flags & BH_DIRTY) | |
| 564 && (status == OK || (hp->bh_bnum >= 0 | |
| 565 && hp->bh_bnum < mfp->mf_infile_count))) | |
| 566 { | |
| 567 if ((flags & MFS_ZERO) && hp->bh_bnum != 0) | |
| 568 continue; | |
| 569 if (mf_write(mfp, hp) == FAIL) | |
| 570 { | |
| 571 if (status == FAIL) /* double error: quit syncing */ | |
| 572 break; | |
| 573 status = FAIL; | |
| 574 } | |
| 575 if (flags & MFS_STOP) | |
| 576 { | |
| 577 /* Stop when char available now. */ | |
| 578 if (ui_char_avail()) | |
| 579 break; | |
| 580 } | |
| 581 else | |
| 582 ui_breakcheck(); | |
| 583 if (got_int) | |
| 584 break; | |
| 585 } | |
| 586 | |
| 587 /* | |
| 588 * If the whole list is flushed, the memfile is not dirty anymore. | |
| 589 * In case of an error this flag is also set, to avoid trying all the time. | |
| 590 */ | |
| 591 if (hp == NULL || status == FAIL) | |
| 592 mfp->mf_dirty = FALSE; | |
| 593 | |
| 594 if ((flags & MFS_FLUSH) && *p_sws != NUL) | |
| 595 { | |
| 596 #if defined(UNIX) | |
| 597 # ifdef HAVE_FSYNC | |
| 598 /* | |
| 599 * most Unixes have the very useful fsync() function, just what we need. | |
| 600 */ | |
| 601 if (STRCMP(p_sws, "fsync") == 0) | |
| 602 { | |
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603 if (vim_fsync(mfp->mf_fd)) |
| 7 | 604 status = FAIL; |
| 605 } | |
| 606 else | |
| 607 # endif | |
| 608 /* OpenNT is strictly POSIX (Benzinger) */ | |
| 609 /* Tandem/Himalaya NSK-OSS doesn't have sync() */ | |
| 6637 | 610 /* No sync() on Stratus VOS */ |
| 611 # if defined(__OPENNT) || defined(__TANDEM) || defined(__VOS__) | |
| 7 | 612 fflush(NULL); |
| 613 # else | |
| 614 sync(); | |
| 615 # endif | |
| 616 #endif | |
| 617 #ifdef VMS | |
| 618 if (STRCMP(p_sws, "fsync") == 0) | |
| 619 { | |
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620 if (vim_fsync(mfp->mf_fd)) |
| 7 | 621 status = FAIL; |
| 622 } | |
| 623 #endif | |
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624 #ifdef MSWIN |
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625 if (_commit(mfp->mf_fd)) |
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626 status = FAIL; |
| 7 | 627 #endif |
| 628 #ifdef AMIGA | |
| 1030 | 629 # if defined(__AROS__) || defined(__amigaos4__) |
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630 if (vim_fsync(mfp->mf_fd) != 0) |
| 7 | 631 status = FAIL; |
| 632 # else | |
| 633 /* | |
| 634 * Flush() only exists for AmigaDos 2.0. | |
| 635 * For 1.3 it should be done with close() + open(), but then the risk | |
| 636 * is that the open() may fail and lose the file.... | |
| 637 */ | |
| 638 # ifdef FEAT_ARP | |
| 639 if (dos2) | |
| 640 # endif | |
| 641 # ifdef SASC | |
| 642 { | |
| 643 struct UFB *fp = chkufb(mfp->mf_fd); | |
| 644 | |
| 645 if (fp != NULL) | |
| 646 Flush(fp->ufbfh); | |
| 647 } | |
| 648 # else | |
| 649 # if defined(_DCC) || defined(__GNUC__) || defined(__MORPHOS__) | |
| 650 { | |
| 984 | 651 # if defined(__GNUC__) && !defined(__MORPHOS__) && defined(__libnix__) |
| 7 | 652 /* Have function (in libnix at least), |
| 653 * but ain't got no prototype anywhere. */ | |
| 654 extern unsigned long fdtofh(int filedescriptor); | |
| 655 # endif | |
| 984 | 656 # if !defined(__libnix__) |
| 657 fflush(NULL); | |
| 658 # else | |
| 7 | 659 BPTR fh = (BPTR)fdtofh(mfp->mf_fd); |
| 660 | |
| 661 if (fh != 0) | |
| 662 Flush(fh); | |
| 984 | 663 # endif |
| 7 | 664 } |
| 665 # else /* assume Manx */ | |
| 666 Flush(_devtab[mfp->mf_fd].fd); | |
| 667 # endif | |
| 668 # endif | |
| 669 # endif | |
| 670 #endif /* AMIGA */ | |
| 671 } | |
| 672 | |
| 673 got_int |= got_int_save; | |
| 674 | |
| 675 return status; | |
| 676 } | |
| 677 | |
| 678 /* | |
| 630 | 679 * For all blocks in memory file *mfp that have a positive block number set |
| 680 * the dirty flag. These are blocks that need to be written to a newly | |
| 681 * created swapfile. | |
| 682 */ | |
| 683 void | |
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684 mf_set_dirty(memfile_T *mfp) |
| 630 | 685 { |
| 686 bhdr_T *hp; | |
| 687 | |
| 688 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev) | |
| 689 if (hp->bh_bnum > 0) | |
| 690 hp->bh_flags |= BH_DIRTY; | |
| 691 mfp->mf_dirty = TRUE; | |
| 692 } | |
| 693 | |
| 694 /* | |
| 7 | 695 * insert block *hp in front of hashlist of memfile *mfp |
| 696 */ | |
| 697 static void | |
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698 mf_ins_hash(memfile_T *mfp, bhdr_T *hp) |
| 7 | 699 { |
| 2730 | 700 mf_hash_add_item(&mfp->mf_hash, (mf_hashitem_T *)hp); |
| 7 | 701 } |
| 702 | |
| 703 /* | |
| 704 * remove block *hp from hashlist of memfile list *mfp | |
| 705 */ | |
| 706 static void | |
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707 mf_rem_hash(memfile_T *mfp, bhdr_T *hp) |
| 7 | 708 { |
| 2730 | 709 mf_hash_rem_item(&mfp->mf_hash, (mf_hashitem_T *)hp); |
| 7 | 710 } |
| 711 | |
| 712 /* | |
| 713 * look in hash lists of memfile *mfp for block header with number 'nr' | |
| 714 */ | |
| 715 static bhdr_T * | |
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716 mf_find_hash(memfile_T *mfp, blocknr_T nr) |
| 7 | 717 { |
| 2730 | 718 return (bhdr_T *)mf_hash_find(&mfp->mf_hash, nr); |
| 7 | 719 } |
| 720 | |
| 721 /* | |
| 722 * insert block *hp in front of used list of memfile *mfp | |
| 723 */ | |
| 724 static void | |
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725 mf_ins_used(memfile_T *mfp, bhdr_T *hp) |
| 7 | 726 { |
| 727 hp->bh_next = mfp->mf_used_first; | |
| 728 mfp->mf_used_first = hp; | |
| 729 hp->bh_prev = NULL; | |
| 730 if (hp->bh_next == NULL) /* list was empty, adjust last pointer */ | |
| 731 mfp->mf_used_last = hp; | |
| 732 else | |
| 733 hp->bh_next->bh_prev = hp; | |
| 734 mfp->mf_used_count += hp->bh_page_count; | |
| 735 total_mem_used += hp->bh_page_count * mfp->mf_page_size; | |
| 736 } | |
| 737 | |
| 738 /* | |
| 739 * remove block *hp from used list of memfile *mfp | |
| 740 */ | |
| 741 static void | |
|
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742 mf_rem_used(memfile_T *mfp, bhdr_T *hp) |
| 7 | 743 { |
| 744 if (hp->bh_next == NULL) /* last block in used list */ | |
| 745 mfp->mf_used_last = hp->bh_prev; | |
| 746 else | |
| 747 hp->bh_next->bh_prev = hp->bh_prev; | |
| 748 if (hp->bh_prev == NULL) /* first block in used list */ | |
| 749 mfp->mf_used_first = hp->bh_next; | |
| 750 else | |
| 751 hp->bh_prev->bh_next = hp->bh_next; | |
| 752 mfp->mf_used_count -= hp->bh_page_count; | |
| 753 total_mem_used -= hp->bh_page_count * mfp->mf_page_size; | |
| 754 } | |
| 755 | |
| 756 /* | |
| 757 * Release the least recently used block from the used list if the number | |
| 758 * of used memory blocks gets to big. | |
| 759 * | |
| 760 * Return the block header to the caller, including the memory block, so | |
| 761 * it can be re-used. Make sure the page_count is right. | |
| 6817 | 762 * |
| 763 * Returns NULL if no block is released. | |
| 7 | 764 */ |
| 765 static bhdr_T * | |
|
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766 mf_release(memfile_T *mfp, int page_count) |
| 7 | 767 { |
| 768 bhdr_T *hp; | |
| 769 int need_release; | |
| 770 buf_T *buf; | |
| 771 | |
| 772 /* don't release while in mf_close_file() */ | |
| 1066 | 773 if (mf_dont_release) |
| 7 | 774 return NULL; |
| 775 | |
| 776 /* | |
| 777 * Need to release a block if the number of blocks for this memfile is | |
| 778 * higher than the maximum or total memory used is over 'maxmemtot' | |
| 779 */ | |
| 780 need_release = ((mfp->mf_used_count >= mfp->mf_used_count_max) | |
| 781 || (total_mem_used >> 10) >= (long_u)p_mmt); | |
| 782 | |
| 783 /* | |
| 784 * Try to create a swap file if the amount of memory used is getting too | |
| 785 * high. | |
| 786 */ | |
| 787 if (mfp->mf_fd < 0 && need_release && p_uc) | |
| 788 { | |
| 789 /* find for which buffer this memfile is */ | |
|
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790 FOR_ALL_BUFFERS(buf) |
| 7 | 791 if (buf->b_ml.ml_mfp == mfp) |
| 792 break; | |
| 793 if (buf != NULL && buf->b_may_swap) | |
| 794 ml_open_file(buf); | |
| 795 } | |
| 796 | |
| 797 /* | |
| 798 * don't release a block if | |
| 799 * there is no file for this memfile | |
| 800 * or | |
| 801 * the number of blocks for this memfile is lower than the maximum | |
| 802 * and | |
| 803 * total memory used is not up to 'maxmemtot' | |
| 804 */ | |
| 805 if (mfp->mf_fd < 0 || !need_release) | |
| 806 return NULL; | |
| 807 | |
| 808 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev) | |
| 809 if (!(hp->bh_flags & BH_LOCKED)) | |
| 810 break; | |
| 811 if (hp == NULL) /* not a single one that can be released */ | |
| 812 return NULL; | |
| 813 | |
| 814 /* | |
| 815 * If the block is dirty, write it. | |
| 816 * If the write fails we don't free it. | |
| 817 */ | |
| 818 if ((hp->bh_flags & BH_DIRTY) && mf_write(mfp, hp) == FAIL) | |
| 819 return NULL; | |
| 820 | |
| 821 mf_rem_used(mfp, hp); | |
| 822 mf_rem_hash(mfp, hp); | |
| 823 | |
| 824 /* | |
| 825 * If a bhdr_T is returned, make sure that the page_count of bh_data is | |
| 826 * right | |
| 827 */ | |
| 828 if (hp->bh_page_count != page_count) | |
| 829 { | |
| 830 vim_free(hp->bh_data); | |
| 831 if ((hp->bh_data = alloc(mfp->mf_page_size * page_count)) == NULL) | |
| 832 { | |
| 833 vim_free(hp); | |
| 834 return NULL; | |
| 835 } | |
| 836 hp->bh_page_count = page_count; | |
| 837 } | |
| 838 return hp; | |
| 839 } | |
| 840 | |
| 841 /* | |
| 842 * release as many blocks as possible | |
| 843 * Used in case of out of memory | |
| 844 * | |
| 845 * return TRUE if any memory was released | |
| 846 */ | |
| 847 int | |
|
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848 mf_release_all(void) |
| 7 | 849 { |
| 850 buf_T *buf; | |
| 851 memfile_T *mfp; | |
| 852 bhdr_T *hp; | |
| 853 int retval = FALSE; | |
| 854 | |
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855 FOR_ALL_BUFFERS(buf) |
| 7 | 856 { |
| 857 mfp = buf->b_ml.ml_mfp; | |
| 858 if (mfp != NULL) | |
| 859 { | |
| 860 /* If no swap file yet, may open one */ | |
| 861 if (mfp->mf_fd < 0 && buf->b_may_swap) | |
| 862 ml_open_file(buf); | |
| 863 | |
| 864 /* only if there is a swapfile */ | |
| 865 if (mfp->mf_fd >= 0) | |
| 866 { | |
| 867 for (hp = mfp->mf_used_last; hp != NULL; ) | |
| 868 { | |
| 869 if (!(hp->bh_flags & BH_LOCKED) | |
| 870 && (!(hp->bh_flags & BH_DIRTY) | |
| 871 || mf_write(mfp, hp) != FAIL)) | |
| 872 { | |
| 873 mf_rem_used(mfp, hp); | |
| 874 mf_rem_hash(mfp, hp); | |
| 875 mf_free_bhdr(hp); | |
| 876 hp = mfp->mf_used_last; /* re-start, list was changed */ | |
| 877 retval = TRUE; | |
| 878 } | |
| 879 else | |
| 880 hp = hp->bh_prev; | |
| 881 } | |
| 882 } | |
| 883 } | |
| 884 } | |
| 885 return retval; | |
| 886 } | |
| 887 | |
| 888 /* | |
| 889 * Allocate a block header and a block of memory for it | |
| 890 */ | |
| 891 static bhdr_T * | |
|
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892 mf_alloc_bhdr(memfile_T *mfp, int page_count) |
| 7 | 893 { |
| 894 bhdr_T *hp; | |
| 895 | |
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896 if ((hp = ALLOC_ONE(bhdr_T)) != NULL) |
| 7 | 897 { |
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898 if ((hp->bh_data = alloc(mfp->mf_page_size * page_count)) == NULL) |
| 7 | 899 { |
| 900 vim_free(hp); /* not enough memory */ | |
| 901 return NULL; | |
| 902 } | |
| 903 hp->bh_page_count = page_count; | |
| 904 } | |
| 905 return hp; | |
| 906 } | |
| 907 | |
| 908 /* | |
| 909 * Free a block header and the block of memory for it | |
| 910 */ | |
| 911 static void | |
|
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912 mf_free_bhdr(bhdr_T *hp) |
| 7 | 913 { |
| 914 vim_free(hp->bh_data); | |
| 915 vim_free(hp); | |
| 916 } | |
| 917 | |
| 918 /* | |
| 919 * insert entry *hp in the free list | |
| 920 */ | |
| 921 static void | |
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922 mf_ins_free(memfile_T *mfp, bhdr_T *hp) |
| 7 | 923 { |
| 924 hp->bh_next = mfp->mf_free_first; | |
| 925 mfp->mf_free_first = hp; | |
| 926 } | |
| 927 | |
| 928 /* | |
| 929 * remove the first entry from the free list and return a pointer to it | |
| 930 * Note: caller must check that mfp->mf_free_first is not NULL! | |
| 931 */ | |
| 932 static bhdr_T * | |
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933 mf_rem_free(memfile_T *mfp) |
| 7 | 934 { |
| 935 bhdr_T *hp; | |
| 936 | |
| 937 hp = mfp->mf_free_first; | |
| 938 mfp->mf_free_first = hp->bh_next; | |
| 939 return hp; | |
| 940 } | |
| 941 | |
| 942 /* | |
| 943 * read a block from disk | |
| 944 * | |
| 945 * Return FAIL for failure, OK otherwise | |
| 946 */ | |
| 947 static int | |
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948 mf_read(memfile_T *mfp, bhdr_T *hp) |
| 7 | 949 { |
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950 off_T offset; |
| 7 | 951 unsigned page_size; |
| 952 unsigned size; | |
| 953 | |
| 954 if (mfp->mf_fd < 0) /* there is no file, can't read */ | |
| 955 return FAIL; | |
| 956 | |
| 957 page_size = mfp->mf_page_size; | |
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958 offset = (off_T)page_size * hp->bh_bnum; |
| 7 | 959 size = page_size * hp->bh_page_count; |
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960 if (vim_lseek(mfp->mf_fd, offset, SEEK_SET) != offset) |
| 7 | 961 { |
| 1033 | 962 PERROR(_("E294: Seek error in swap file read")); |
| 7 | 963 return FAIL; |
| 964 } | |
| 2664 | 965 if ((unsigned)read_eintr(mfp->mf_fd, hp->bh_data, size) != size) |
| 7 | 966 { |
| 1033 | 967 PERROR(_("E295: Read error in swap file")); |
| 7 | 968 return FAIL; |
| 969 } | |
| 2267 | 970 |
| 971 #ifdef FEAT_CRYPT | |
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972 /* Decrypt if 'key' is set and this is a data block. And when changing the |
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973 * key. */ |
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974 if (*mfp->mf_buffer->b_p_key != NUL || mfp->mf_old_key != NULL) |
| 2267 | 975 ml_decrypt_data(mfp, hp->bh_data, offset, size); |
| 976 #endif | |
| 977 | |
| 7 | 978 return OK; |
| 979 } | |
| 980 | |
| 981 /* | |
| 982 * write a block to disk | |
| 983 * | |
| 984 * Return FAIL for failure, OK otherwise | |
| 985 */ | |
| 986 static int | |
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987 mf_write(memfile_T *mfp, bhdr_T *hp) |
| 7 | 988 { |
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989 off_T offset; /* offset in the file */ |
| 7 | 990 blocknr_T nr; /* block nr which is being written */ |
| 991 bhdr_T *hp2; | |
| 992 unsigned page_size; /* number of bytes in a page */ | |
| 993 unsigned page_count; /* number of pages written */ | |
| 994 unsigned size; /* number of bytes written */ | |
| 995 | |
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996 if (mfp->mf_fd < 0 && !mfp->mf_reopen) |
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997 // there is no file and there was no file, can't write |
| 7 | 998 return FAIL; |
| 999 | |
| 1000 if (hp->bh_bnum < 0) /* must assign file block number */ | |
| 1001 if (mf_trans_add(mfp, hp) == FAIL) | |
| 1002 return FAIL; | |
| 1003 | |
| 1004 page_size = mfp->mf_page_size; | |
| 1005 | |
| 1006 /* | |
| 1007 * We don't want gaps in the file. Write the blocks in front of *hp | |
| 1008 * to extend the file. | |
| 1009 * If block 'mf_infile_count' is not in the hash list, it has been | |
| 1010 * freed. Fill the space in the file with data from the current block. | |
| 1011 */ | |
| 1012 for (;;) | |
| 1013 { | |
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1014 int attempt; |
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1015 |
| 7 | 1016 nr = hp->bh_bnum; |
| 1017 if (nr > mfp->mf_infile_count) /* beyond end of file */ | |
| 1018 { | |
| 1019 nr = mfp->mf_infile_count; | |
| 4352 | 1020 hp2 = mf_find_hash(mfp, nr); /* NULL caught below */ |
| 7 | 1021 } |
| 1022 else | |
| 1023 hp2 = hp; | |
| 1024 | |
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1025 offset = (off_T)page_size * nr; |
| 7 | 1026 if (hp2 == NULL) /* freed block, fill with dummy data */ |
| 1027 page_count = 1; | |
| 1028 else | |
| 1029 page_count = hp2->bh_page_count; | |
| 1030 size = page_size * page_count; | |
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1031 |
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1032 for (attempt = 1; attempt <= 2; ++attempt) |
| 7 | 1033 { |
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1034 if (mfp->mf_fd >= 0) |
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1035 { |
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1036 if (vim_lseek(mfp->mf_fd, offset, SEEK_SET) != offset) |
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1037 { |
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1038 PERROR(_("E296: Seek error in swap file write")); |
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1039 return FAIL; |
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1040 } |
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1041 if (mf_write_block(mfp, |
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1042 hp2 == NULL ? hp : hp2, offset, size) == OK) |
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1043 break; |
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1044 } |
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1045 |
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1046 if (attempt == 1) |
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1047 { |
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1048 // If the swap file is on a network drive, and the network |
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1049 // gets disconnected and then re-connected, we can maybe fix it |
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1050 // by closing and then re-opening the file. |
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1051 if (mfp->mf_fd >= 0) |
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1052 close(mfp->mf_fd); |
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1053 mfp->mf_fd = mch_open_rw((char *)mfp->mf_fname, mfp->mf_flags); |
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1054 mfp->mf_reopen = (mfp->mf_fd < 0); |
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1055 } |
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1056 if (attempt == 2 || mfp->mf_fd < 0) |
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1057 { |
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1058 // Avoid repeating the error message, this mostly happens when |
|
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1059 // the disk is full. We give the message again only after a |
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1060 // successful write or when hitting a key. We keep on trying, |
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1061 // in case some space becomes available. |
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1062 if (!did_swapwrite_msg) |
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1063 emsg(_("E297: Write error in swap file")); |
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1064 did_swapwrite_msg = TRUE; |
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1065 return FAIL; |
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1066 } |
| 7 | 1067 } |
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1068 |
| 7 | 1069 did_swapwrite_msg = FALSE; |
| 1070 if (hp2 != NULL) /* written a non-dummy block */ | |
| 1071 hp2->bh_flags &= ~BH_DIRTY; | |
| 1072 /* appended to the file */ | |
| 1073 if (nr + (blocknr_T)page_count > mfp->mf_infile_count) | |
| 1074 mfp->mf_infile_count = nr + page_count; | |
| 1075 if (nr == hp->bh_bnum) /* written the desired block */ | |
| 1076 break; | |
| 1077 } | |
| 1078 return OK; | |
| 1079 } | |
| 1080 | |
| 1081 /* | |
| 2267 | 1082 * Write block "hp" with data size "size" to file "mfp->mf_fd". |
| 1083 * Takes care of encryption. | |
| 1084 * Return FAIL or OK. | |
| 1085 */ | |
| 1086 static int | |
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1087 mf_write_block( |
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1088 memfile_T *mfp, |
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1089 bhdr_T *hp, |
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1090 off_T offset UNUSED, |
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1091 unsigned size) |
| 2267 | 1092 { |
| 1093 char_u *data = hp->bh_data; | |
| 1094 int result = OK; | |
| 1095 | |
| 1096 #ifdef FEAT_CRYPT | |
| 1097 /* Encrypt if 'key' is set and this is a data block. */ | |
| 1098 if (*mfp->mf_buffer->b_p_key != NUL) | |
| 1099 { | |
| 1100 data = ml_encrypt_data(mfp, data, offset, size); | |
| 1101 if (data == NULL) | |
| 1102 return FAIL; | |
| 1103 } | |
| 1104 #endif | |
| 1105 | |
| 2664 | 1106 if ((unsigned)write_eintr(mfp->mf_fd, data, size) != size) |
| 2267 | 1107 result = FAIL; |
| 1108 | |
| 1109 #ifdef FEAT_CRYPT | |
| 1110 if (data != hp->bh_data) | |
| 1111 vim_free(data); | |
| 1112 #endif | |
| 1113 | |
| 1114 return result; | |
| 1115 } | |
| 1116 | |
| 1117 /* | |
| 7 | 1118 * Make block number for *hp positive and add it to the translation list |
| 1119 * | |
| 1120 * Return FAIL for failure, OK otherwise | |
| 1121 */ | |
| 1122 static int | |
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1123 mf_trans_add(memfile_T *mfp, bhdr_T *hp) |
| 7 | 1124 { |
| 1125 bhdr_T *freep; | |
| 1126 blocknr_T new_bnum; | |
| 1127 NR_TRANS *np; | |
| 1128 int page_count; | |
| 1129 | |
| 1130 if (hp->bh_bnum >= 0) /* it's already positive */ | |
| 1131 return OK; | |
| 1132 | |
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1133 if ((np = ALLOC_ONE(NR_TRANS)) == NULL) |
| 7 | 1134 return FAIL; |
| 1135 | |
| 1136 /* | |
| 2267 | 1137 * Get a new number for the block. |
| 7 | 1138 * If the first item in the free list has sufficient pages, use its number |
| 1139 * Otherwise use mf_blocknr_max. | |
| 1140 */ | |
| 1141 freep = mfp->mf_free_first; | |
| 1142 page_count = hp->bh_page_count; | |
| 1143 if (freep != NULL && freep->bh_page_count >= page_count) | |
| 1144 { | |
| 1145 new_bnum = freep->bh_bnum; | |
| 1146 /* | |
| 4352 | 1147 * If the page count of the free block was larger, reduce it. |
| 7 | 1148 * If the page count matches, remove the block from the free list |
| 1149 */ | |
| 1150 if (freep->bh_page_count > page_count) | |
| 1151 { | |
| 1152 freep->bh_bnum += page_count; | |
| 1153 freep->bh_page_count -= page_count; | |
| 1154 } | |
| 1155 else | |
| 1156 { | |
| 1157 freep = mf_rem_free(mfp); | |
| 1158 vim_free(freep); | |
| 1159 } | |
| 1160 } | |
| 1161 else | |
| 1162 { | |
| 1163 new_bnum = mfp->mf_blocknr_max; | |
| 1164 mfp->mf_blocknr_max += page_count; | |
| 1165 } | |
| 1166 | |
| 1167 np->nt_old_bnum = hp->bh_bnum; /* adjust number */ | |
| 1168 np->nt_new_bnum = new_bnum; | |
| 1169 | |
| 1170 mf_rem_hash(mfp, hp); /* remove from old hash list */ | |
| 1171 hp->bh_bnum = new_bnum; | |
| 1172 mf_ins_hash(mfp, hp); /* insert in new hash list */ | |
| 1173 | |
| 2730 | 1174 /* Insert "np" into "mf_trans" hashtable with key "np->nt_old_bnum" */ |
| 1175 mf_hash_add_item(&mfp->mf_trans, (mf_hashitem_T *)np); | |
| 7 | 1176 |
| 1177 return OK; | |
| 1178 } | |
| 1179 | |
| 1180 /* | |
| 6817 | 1181 * Lookup a translation from the trans lists and delete the entry. |
| 7 | 1182 * |
| 1183 * Return the positive new number when found, the old number when not found | |
| 1184 */ | |
| 1185 blocknr_T | |
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1186 mf_trans_del(memfile_T *mfp, blocknr_T old_nr) |
| 7 | 1187 { |
| 1188 NR_TRANS *np; | |
| 1189 blocknr_T new_bnum; | |
| 1190 | |
| 2730 | 1191 np = (NR_TRANS *)mf_hash_find(&mfp->mf_trans, old_nr); |
| 1192 | |
| 7 | 1193 if (np == NULL) /* not found */ |
| 1194 return old_nr; | |
| 1195 | |
| 1196 mfp->mf_neg_count--; | |
| 1197 new_bnum = np->nt_new_bnum; | |
| 2730 | 1198 |
| 1199 /* remove entry from the trans list */ | |
| 1200 mf_hash_rem_item(&mfp->mf_trans, (mf_hashitem_T *)np); | |
| 1201 | |
| 7 | 1202 vim_free(np); |
| 1203 | |
| 1204 return new_bnum; | |
| 1205 } | |
| 1206 | |
| 1207 /* | |
| 1208 * Set mfp->mf_ffname according to mfp->mf_fname and some other things. | |
| 1209 * Only called when creating or renaming the swapfile. Either way it's a new | |
| 1210 * name so we must work out the full path name. | |
| 1211 */ | |
| 1212 void | |
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1213 mf_set_ffname(memfile_T *mfp) |
| 7 | 1214 { |
| 1215 mfp->mf_ffname = FullName_save(mfp->mf_fname, FALSE); | |
| 1216 } | |
| 1217 | |
| 1218 /* | |
| 1219 * Make the name of the file used for the memfile a full path. | |
| 1220 * Used before doing a :cd | |
| 1221 */ | |
| 1222 void | |
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1223 mf_fullname(memfile_T *mfp) |
| 7 | 1224 { |
| 1225 if (mfp != NULL && mfp->mf_fname != NULL && mfp->mf_ffname != NULL) | |
| 1226 { | |
| 1227 vim_free(mfp->mf_fname); | |
| 1228 mfp->mf_fname = mfp->mf_ffname; | |
| 1229 mfp->mf_ffname = NULL; | |
| 1230 } | |
| 1231 } | |
| 1232 | |
| 1233 /* | |
| 1234 * return TRUE if there are any translations pending for 'mfp' | |
| 1235 */ | |
| 1236 int | |
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1237 mf_need_trans(memfile_T *mfp) |
| 7 | 1238 { |
| 1239 return (mfp->mf_fname != NULL && mfp->mf_neg_count > 0); | |
| 1240 } | |
| 1241 | |
| 1242 /* | |
| 1243 * Open a swap file for a memfile. | |
| 1244 * The "fname" must be in allocated memory, and is consumed (also when an | |
| 1245 * error occurs). | |
| 1246 */ | |
| 1247 static void | |
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1248 mf_do_open( |
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1249 memfile_T *mfp, |
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1250 char_u *fname, |
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1251 int flags) /* flags for open() */ |
| 7 | 1252 { |
| 1253 #ifdef HAVE_LSTAT | |
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1254 stat_T sb; |
| 7 | 1255 #endif |
| 1256 | |
| 1257 mfp->mf_fname = fname; | |
| 1258 | |
| 1259 /* | |
| 1260 * Get the full path name before the open, because this is | |
| 1261 * not possible after the open on the Amiga. | |
| 1262 * fname cannot be NameBuff, because it must have been allocated. | |
| 1263 */ | |
| 1264 mf_set_ffname(mfp); | |
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1265 #if defined(MSWIN) |
| 7 | 1266 /* |
| 4352 | 1267 * A ":!cd e:xxx" may change the directory without us knowing, use the |
| 7 | 1268 * full pathname always. Careful: This frees fname! |
| 1269 */ | |
| 1270 mf_fullname(mfp); | |
| 1271 #endif | |
| 1272 | |
| 1273 #ifdef HAVE_LSTAT | |
| 1274 /* | |
| 1275 * Extra security check: When creating a swap file it really shouldn't | |
| 1276 * exist yet. If there is a symbolic link, this is most likely an attack. | |
| 1277 */ | |
| 1278 if ((flags & O_CREAT) && mch_lstat((char *)mfp->mf_fname, &sb) >= 0) | |
| 1279 { | |
| 1280 mfp->mf_fd = -1; | |
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1281 emsg(_("E300: Swap file already exists (symlink attack?)")); |
| 7 | 1282 } |
| 1283 else | |
| 1284 #endif | |
| 1285 { | |
| 1286 /* | |
| 1287 * try to open the file | |
| 1288 */ | |
| 557 | 1289 flags |= O_EXTRA | O_NOFOLLOW; |
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1290 #ifdef MSWIN |
| 7 | 1291 /* Prevent handle inheritance that cause problems with Cscope |
| 1292 * (swap file may not be deleted if cscope connection was open after | |
| 1293 * the file) */ | |
| 1294 flags |= O_NOINHERIT; | |
| 1295 #endif | |
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1296 mfp->mf_flags = flags; |
| 7 | 1297 mfp->mf_fd = mch_open_rw((char *)mfp->mf_fname, flags); |
| 1298 } | |
| 1299 | |
| 1300 /* | |
| 1301 * If the file cannot be opened, use memory only | |
| 1302 */ | |
| 1303 if (mfp->mf_fd < 0) | |
| 1304 { | |
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1305 VIM_CLEAR(mfp->mf_fname); |
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1306 VIM_CLEAR(mfp->mf_ffname); |
| 7 | 1307 } |
| 1308 else | |
| 1583 | 1309 { |
| 2003 | 1310 #ifdef HAVE_FD_CLOEXEC |
| 1311 int fdflags = fcntl(mfp->mf_fd, F_GETFD); | |
| 1312 if (fdflags >= 0 && (fdflags & FD_CLOEXEC) == 0) | |
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1313 (void)fcntl(mfp->mf_fd, F_SETFD, fdflags | FD_CLOEXEC); |
| 2003 | 1314 #endif |
| 5788 | 1315 #if defined(HAVE_SELINUX) || defined(HAVE_SMACK) |
| 1583 | 1316 mch_copy_sec(fname, mfp->mf_fname); |
| 1317 #endif | |
| 7 | 1318 mch_hide(mfp->mf_fname); /* try setting the 'hidden' flag */ |
| 1583 | 1319 } |
| 7 | 1320 } |
| 2730 | 1321 |
| 1322 /* | |
| 1323 * Implementation of mf_hashtab_T follows. | |
| 1324 */ | |
| 1325 | |
| 1326 /* | |
| 1327 * The number of buckets in the hashtable is increased by a factor of | |
| 1328 * MHT_GROWTH_FACTOR when the average number of items per bucket | |
| 1329 * exceeds 2 ^ MHT_LOG_LOAD_FACTOR. | |
| 1330 */ | |
| 1331 #define MHT_LOG_LOAD_FACTOR 6 | |
| 1332 #define MHT_GROWTH_FACTOR 2 /* must be a power of two */ | |
| 1333 | |
| 1334 /* | |
| 1335 * Initialize an empty hash table. | |
| 1336 */ | |
| 1337 static void | |
|
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1338 mf_hash_init(mf_hashtab_T *mht) |
| 2730 | 1339 { |
| 1340 vim_memset(mht, 0, sizeof(mf_hashtab_T)); | |
| 1341 mht->mht_buckets = mht->mht_small_buckets; | |
| 1342 mht->mht_mask = MHT_INIT_SIZE - 1; | |
| 1343 } | |
| 1344 | |
| 1345 /* | |
| 1346 * Free the array of a hash table. Does not free the items it contains! | |
| 1347 * The hash table must not be used again without another mf_hash_init() call. | |
| 1348 */ | |
| 1349 static void | |
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1350 mf_hash_free(mf_hashtab_T *mht) |
| 2730 | 1351 { |
| 1352 if (mht->mht_buckets != mht->mht_small_buckets) | |
| 1353 vim_free(mht->mht_buckets); | |
| 1354 } | |
| 1355 | |
| 1356 /* | |
| 1357 * Free the array of a hash table and all the items it contains. | |
| 1358 */ | |
| 1359 static void | |
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1360 mf_hash_free_all(mf_hashtab_T *mht) |
| 2730 | 1361 { |
| 1362 long_u idx; | |
| 1363 mf_hashitem_T *mhi; | |
| 1364 mf_hashitem_T *next; | |
| 1365 | |
| 1366 for (idx = 0; idx <= mht->mht_mask; idx++) | |
| 1367 for (mhi = mht->mht_buckets[idx]; mhi != NULL; mhi = next) | |
| 1368 { | |
| 1369 next = mhi->mhi_next; | |
| 1370 vim_free(mhi); | |
| 1371 } | |
| 1372 | |
| 1373 mf_hash_free(mht); | |
| 1374 } | |
| 1375 | |
| 1376 /* | |
| 1377 * Find "key" in hashtable "mht". | |
| 1378 * Returns a pointer to a mf_hashitem_T or NULL if the item was not found. | |
| 1379 */ | |
| 1380 static mf_hashitem_T * | |
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1381 mf_hash_find(mf_hashtab_T *mht, blocknr_T key) |
| 2730 | 1382 { |
| 1383 mf_hashitem_T *mhi; | |
| 1384 | |
| 1385 mhi = mht->mht_buckets[key & mht->mht_mask]; | |
| 1386 while (mhi != NULL && mhi->mhi_key != key) | |
| 1387 mhi = mhi->mhi_next; | |
| 1388 | |
| 1389 return mhi; | |
| 1390 } | |
| 1391 | |
| 1392 /* | |
| 1393 * Add item "mhi" to hashtable "mht". | |
| 1394 * "mhi" must not be NULL. | |
| 1395 */ | |
| 1396 static void | |
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1397 mf_hash_add_item(mf_hashtab_T *mht, mf_hashitem_T *mhi) |
| 2730 | 1398 { |
| 1399 long_u idx; | |
| 1400 | |
| 1401 idx = mhi->mhi_key & mht->mht_mask; | |
| 1402 mhi->mhi_next = mht->mht_buckets[idx]; | |
| 1403 mhi->mhi_prev = NULL; | |
| 1404 if (mhi->mhi_next != NULL) | |
| 1405 mhi->mhi_next->mhi_prev = mhi; | |
| 1406 mht->mht_buckets[idx] = mhi; | |
| 1407 | |
| 1408 mht->mht_count++; | |
| 1409 | |
| 1410 /* | |
| 1411 * Grow hashtable when we have more thank 2^MHT_LOG_LOAD_FACTOR | |
| 1412 * items per bucket on average | |
| 1413 */ | |
| 1414 if (mht->mht_fixed == 0 | |
| 1415 && (mht->mht_count >> MHT_LOG_LOAD_FACTOR) > mht->mht_mask) | |
| 1416 { | |
| 1417 if (mf_hash_grow(mht) == FAIL) | |
| 1418 { | |
| 1419 /* stop trying to grow after first failure to allocate memory */ | |
| 1420 mht->mht_fixed = 1; | |
| 1421 } | |
| 1422 } | |
| 1423 } | |
| 1424 | |
| 1425 /* | |
| 1426 * Remove item "mhi" from hashtable "mht". | |
| 1427 * "mhi" must not be NULL and must have been inserted into "mht". | |
| 1428 */ | |
| 1429 static void | |
|
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Christian Brabandt <cb@256bit.org>
parents:
7803
diff
changeset
|
1430 mf_hash_rem_item(mf_hashtab_T *mht, mf_hashitem_T *mhi) |
| 2730 | 1431 { |
| 1432 if (mhi->mhi_prev == NULL) | |
| 1433 mht->mht_buckets[mhi->mhi_key & mht->mht_mask] = mhi->mhi_next; | |
| 1434 else | |
| 1435 mhi->mhi_prev->mhi_next = mhi->mhi_next; | |
| 1436 | |
| 1437 if (mhi->mhi_next != NULL) | |
| 1438 mhi->mhi_next->mhi_prev = mhi->mhi_prev; | |
| 1439 | |
| 1440 mht->mht_count--; | |
| 1441 | |
| 1442 /* We could shrink the table here, but it typically takes little memory, | |
| 1443 * so why bother? */ | |
| 1444 } | |
| 1445 | |
| 1446 /* | |
| 1447 * Increase number of buckets in the hashtable by MHT_GROWTH_FACTOR and | |
| 1448 * rehash items. | |
| 1449 * Returns FAIL when out of memory. | |
| 1450 */ | |
| 1451 static int | |
|
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commit https://github.com/vim/vim/commit/52ea13da0fe86df1abf34de52841e367035170c0
Christian Brabandt <cb@256bit.org>
parents:
7803
diff
changeset
|
1452 mf_hash_grow(mf_hashtab_T *mht) |
| 2730 | 1453 { |
| 1454 long_u i, j; | |
| 1455 int shift; | |
| 1456 mf_hashitem_T *mhi; | |
| 1457 mf_hashitem_T *tails[MHT_GROWTH_FACTOR]; | |
| 1458 mf_hashitem_T **buckets; | |
| 1459 size_t size; | |
| 1460 | |
| 1461 size = (mht->mht_mask + 1) * MHT_GROWTH_FACTOR * sizeof(void *); | |
|
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Bram Moolenaar <Bram@vim.org>
parents:
16823
diff
changeset
|
1462 buckets = lalloc_clear(size, FALSE); |
| 2730 | 1463 if (buckets == NULL) |
| 1464 return FAIL; | |
| 1465 | |
| 1466 shift = 0; | |
| 1467 while ((mht->mht_mask >> shift) != 0) | |
| 1468 shift++; | |
| 1469 | |
| 1470 for (i = 0; i <= mht->mht_mask; i++) | |
| 1471 { | |
| 1472 /* | |
| 1473 * Traverse the items in the i-th original bucket and move them into | |
| 1474 * MHT_GROWTH_FACTOR new buckets, preserving their relative order | |
| 1475 * within each new bucket. Preserving the order is important because | |
| 1476 * mf_get() tries to keep most recently used items at the front of | |
| 1477 * each bucket. | |
| 1478 * | |
| 1479 * Here we strongly rely on the fact the hashes are computed modulo | |
| 1480 * a power of two. | |
| 1481 */ | |
| 1482 | |
| 1483 vim_memset(tails, 0, sizeof(tails)); | |
| 1484 | |
| 1485 for (mhi = mht->mht_buckets[i]; mhi != NULL; mhi = mhi->mhi_next) | |
| 1486 { | |
| 1487 j = (mhi->mhi_key >> shift) & (MHT_GROWTH_FACTOR - 1); | |
| 1488 if (tails[j] == NULL) | |
| 1489 { | |
| 1490 buckets[i + (j << shift)] = mhi; | |
| 1491 tails[j] = mhi; | |
| 1492 mhi->mhi_prev = NULL; | |
| 1493 } | |
| 1494 else | |
| 1495 { | |
| 1496 tails[j]->mhi_next = mhi; | |
| 1497 mhi->mhi_prev = tails[j]; | |
| 1498 tails[j] = mhi; | |
| 1499 } | |
| 1500 } | |
| 1501 | |
| 1502 for (j = 0; j < MHT_GROWTH_FACTOR; j++) | |
| 1503 if (tails[j] != NULL) | |
| 1504 tails[j]->mhi_next = NULL; | |
| 1505 } | |
| 1506 | |
| 1507 if (mht->mht_buckets != mht->mht_small_buckets) | |
| 1508 vim_free(mht->mht_buckets); | |
| 1509 | |
| 1510 mht->mht_buckets = buckets; | |
| 1511 mht->mht_mask = (mht->mht_mask + 1) * MHT_GROWTH_FACTOR - 1; | |
| 1512 | |
| 1513 return OK; | |
| 1514 } |