Mercurial > vim
annotate src/memfile.c @ 27453:c7f614c9ceb3 v8.2.4255
patch 8.2.4255: theoretical computation overflow
Commit: https://github.com/vim/vim/commit/d5cec1f1f055316c353cfa15ad8d5eb0952d50a0
Author: =?UTF-8?q?Dundar=20G=C3=B6c?= <gocdundar@gmail.com>
Date: Sat Jan 29 15:19:23 2022 +0000
patch 8.2.4255: theoretical computation overflow
Problem: Theoretical computation overflow.
Solution: Perform multiplication in a wider type. (closes https://github.com/vim/vim/issues/9657)
| author | Bram Moolenaar <Bram@vim.org> |
|---|---|
| date | Sat, 29 Jan 2022 16:30:03 +0100 |
| parents | aa65d1808bd0 |
| children | 7a64222fad8e |
| rev | line source |
|---|---|
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1 /* vi:set ts=8 sts=4 sw=4 noet: |
| 7 | 2 * |
| 3 * VIM - Vi IMproved by Bram Moolenaar | |
| 4 * | |
| 5 * Do ":help uganda" in Vim to read copying and usage conditions. | |
| 6 * Do ":help credits" in Vim to see a list of people who contributed. | |
| 7 * See README.txt for an overview of the Vim source code. | |
| 8 */ | |
| 9 | |
| 10 /* | |
| 11 * memfile.c: Contains the functions for handling blocks of memory which can | |
| 12 * be stored in a file. This is the implementation of a sort of virtual memory. | |
| 13 * | |
| 14 * A memfile consists of a sequence of blocks. The blocks numbered from 0 | |
| 15 * upwards have been assigned a place in the actual file. The block number | |
| 16 * is equal to the page number in the file. The | |
| 17 * blocks with negative numbers are currently in memory only. They can be | |
| 18 * assigned a place in the file when too much memory is being used. At that | |
| 19 * moment they get a new, positive, number. A list is used for translation of | |
| 20 * negative to positive numbers. | |
| 21 * | |
| 22 * The size of a block is a multiple of a page size, normally the page size of | |
| 23 * the device the file is on. Most blocks are 1 page long. A Block of multiple | |
| 24 * pages is used for a line that does not fit in a single page. | |
| 25 * | |
| 26 * Each block can be in memory and/or in a file. The block stays in memory | |
| 27 * as long as it is locked. If it is no longer locked it can be swapped out to | |
| 28 * the file. It is only written to the file if it has been changed. | |
| 29 * | |
| 30 * Under normal operation the file is created when opening the memory file and | |
| 31 * deleted when closing the memory file. Only with recovery an existing memory | |
| 32 * file is opened. | |
| 33 */ | |
| 34 | |
| 35 #include "vim.h" | |
| 36 | |
| 37 /* | |
| 38 * Some systems have the page size in statfs.f_bsize, some in stat.st_blksize | |
| 39 */ | |
| 40 #ifdef HAVE_ST_BLKSIZE | |
| 41 # define STATFS stat | |
| 42 # define F_BSIZE st_blksize | |
| 43 # define fstatfs(fd, buf, len, nul) mch_fstat((fd), (buf)) | |
| 44 #else | |
| 45 # ifdef HAVE_SYS_STATFS_H | |
| 46 # include <sys/statfs.h> | |
| 47 # define STATFS statfs | |
| 48 # define F_BSIZE f_bsize | |
| 49 # endif | |
| 50 #endif | |
| 51 | |
| 52 /* | |
| 53 * for Amiga Dos 2.0x we use Flush | |
| 54 */ | |
| 55 #ifdef AMIGA | |
| 56 # ifdef FEAT_ARP | |
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57 extern int dos2; // this is in os_amiga.c |
| 7 | 58 # endif |
| 59 # ifdef SASC | |
| 60 # include <proto/dos.h> | |
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61 # include <ios1.h> // for chkufb() |
| 7 | 62 # endif |
| 63 #endif | |
| 64 | |
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65 #define MEMFILE_PAGE_SIZE 4096 // default page size |
| 7 | 66 |
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67 static long_u total_mem_used = 0; // total memory used for memfiles |
| 7 | 68 |
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69 static void mf_ins_hash(memfile_T *, bhdr_T *); |
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70 static void mf_rem_hash(memfile_T *, bhdr_T *); |
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71 static bhdr_T *mf_find_hash(memfile_T *, blocknr_T); |
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72 static void mf_ins_used(memfile_T *, bhdr_T *); |
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73 static void mf_rem_used(memfile_T *, bhdr_T *); |
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74 static bhdr_T *mf_release(memfile_T *, int); |
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75 static bhdr_T *mf_alloc_bhdr(memfile_T *, int); |
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76 static void mf_free_bhdr(bhdr_T *); |
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77 static void mf_ins_free(memfile_T *, bhdr_T *); |
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78 static bhdr_T *mf_rem_free(memfile_T *); |
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79 static int mf_read(memfile_T *, bhdr_T *); |
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80 static int mf_write(memfile_T *, bhdr_T *); |
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81 static int mf_write_block(memfile_T *mfp, bhdr_T *hp, off_T offset, unsigned size); |
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82 static int mf_trans_add(memfile_T *, bhdr_T *); |
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83 static void mf_do_open(memfile_T *, char_u *, int); |
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84 static void mf_hash_init(mf_hashtab_T *); |
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85 static void mf_hash_free(mf_hashtab_T *); |
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86 static void mf_hash_free_all(mf_hashtab_T *); |
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87 static mf_hashitem_T *mf_hash_find(mf_hashtab_T *, blocknr_T); |
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88 static void mf_hash_add_item(mf_hashtab_T *, mf_hashitem_T *); |
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89 static void mf_hash_rem_item(mf_hashtab_T *, mf_hashitem_T *); |
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90 static int mf_hash_grow(mf_hashtab_T *); |
| 7 | 91 |
| 92 /* | |
| 93 * The functions for using a memfile: | |
| 94 * | |
| 95 * mf_open() open a new or existing memfile | |
| 96 * mf_open_file() open a swap file for an existing memfile | |
| 97 * mf_close() close (and delete) a memfile | |
| 98 * mf_new() create a new block in a memfile and lock it | |
| 99 * mf_get() get an existing block and lock it | |
| 100 * mf_put() unlock a block, may be marked for writing | |
| 101 * mf_free() remove a block | |
| 102 * mf_sync() sync changed parts of memfile to disk | |
| 103 * mf_release_all() release as much memory as possible | |
| 104 * mf_trans_del() may translate negative to positive block number | |
| 105 * mf_fullname() make file name full path (use before first :cd) | |
| 106 */ | |
| 107 | |
| 108 /* | |
| 109 * Open an existing or new memory block file. | |
| 110 * | |
| 111 * fname: name of file to use (NULL means no file at all) | |
| 112 * Note: fname must have been allocated, it is not copied! | |
| 113 * If opening the file fails, fname is freed. | |
| 114 * flags: flags for open() call | |
| 115 * | |
| 116 * If fname != NULL and file cannot be opened, fail. | |
| 117 * | |
| 118 * return value: identifier for this memory block file. | |
| 119 */ | |
| 120 memfile_T * | |
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121 mf_open(char_u *fname, int flags) |
| 7 | 122 { |
| 123 memfile_T *mfp; | |
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124 off_T size; |
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125 #if defined(STATFS) && defined(UNIX) && !defined(__QNX__) && !defined(__minix) |
| 7 | 126 # define USE_FSTATFS |
| 127 struct STATFS stf; | |
| 128 #endif | |
| 129 | |
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130 if ((mfp = ALLOC_ONE(memfile_T)) == NULL) |
| 7 | 131 return NULL; |
| 132 | |
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133 if (fname == NULL) // no file for this memfile, use memory only |
| 7 | 134 { |
| 135 mfp->mf_fname = NULL; | |
| 136 mfp->mf_ffname = NULL; | |
| 137 mfp->mf_fd = -1; | |
| 138 } | |
| 139 else | |
| 140 { | |
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141 mf_do_open(mfp, fname, flags); // try to open the file |
| 7 | 142 |
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143 // if the file cannot be opened, return here |
| 7 | 144 if (mfp->mf_fd < 0) |
| 145 { | |
| 146 vim_free(mfp); | |
| 147 return NULL; | |
| 148 } | |
| 149 } | |
| 150 | |
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151 mfp->mf_free_first = NULL; // free list is empty |
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152 mfp->mf_used_first = NULL; // used list is empty |
| 7 | 153 mfp->mf_used_last = NULL; |
| 154 mfp->mf_dirty = FALSE; | |
| 155 mfp->mf_used_count = 0; | |
| 2730 | 156 mf_hash_init(&mfp->mf_hash); |
| 157 mf_hash_init(&mfp->mf_trans); | |
| 7 | 158 mfp->mf_page_size = MEMFILE_PAGE_SIZE; |
| 2267 | 159 #ifdef FEAT_CRYPT |
| 160 mfp->mf_old_key = NULL; | |
| 161 #endif | |
| 7 | 162 |
| 163 #ifdef USE_FSTATFS | |
| 164 /* | |
| 165 * Try to set the page size equal to the block size of the device. | |
| 166 * Speeds up I/O a lot. | |
| 167 * When recovering, the actual block size will be retrieved from block 0 | |
| 168 * in ml_recover(). The size used here may be wrong, therefore | |
| 169 * mf_blocknr_max must be rounded up. | |
| 170 */ | |
| 171 if (mfp->mf_fd >= 0 | |
| 172 && fstatfs(mfp->mf_fd, &stf, sizeof(struct statfs), 0) == 0 | |
| 173 && stf.F_BSIZE >= MIN_SWAP_PAGE_SIZE | |
| 174 && stf.F_BSIZE <= MAX_SWAP_PAGE_SIZE) | |
| 175 mfp->mf_page_size = stf.F_BSIZE; | |
| 176 #endif | |
| 177 | |
| 178 if (mfp->mf_fd < 0 || (flags & (O_TRUNC|O_EXCL)) | |
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179 || (size = vim_lseek(mfp->mf_fd, (off_T)0L, SEEK_END)) <= 0) |
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180 mfp->mf_blocknr_max = 0; // no file or empty file |
| 7 | 181 else |
| 182 mfp->mf_blocknr_max = (blocknr_T)((size + mfp->mf_page_size - 1) | |
| 183 / mfp->mf_page_size); | |
| 184 mfp->mf_blocknr_min = -1; | |
| 185 mfp->mf_neg_count = 0; | |
| 186 mfp->mf_infile_count = mfp->mf_blocknr_max; | |
| 1230 | 187 |
| 188 /* | |
| 189 * Compute maximum number of pages ('maxmem' is in Kbyte): | |
| 190 * 'mammem' * 1Kbyte / page-size-in-bytes. | |
| 191 * Avoid overflow by first reducing page size as much as possible. | |
| 192 */ | |
| 193 { | |
| 194 int shift = 10; | |
| 195 unsigned page_size = mfp->mf_page_size; | |
| 196 | |
| 197 while (shift > 0 && (page_size & 1) == 0) | |
| 198 { | |
| 199 page_size = page_size >> 1; | |
| 200 --shift; | |
| 201 } | |
| 202 mfp->mf_used_count_max = (p_mm << shift) / page_size; | |
| 203 if (mfp->mf_used_count_max < 10) | |
| 204 mfp->mf_used_count_max = 10; | |
| 205 } | |
| 7 | 206 |
| 207 return mfp; | |
| 208 } | |
| 209 | |
| 210 /* | |
| 211 * Open a file for an existing memfile. Used when updatecount set from 0 to | |
| 212 * some value. | |
| 213 * If the file already exists, this fails. | |
| 214 * "fname" is the name of file to use (NULL means no file at all) | |
| 215 * Note: "fname" must have been allocated, it is not copied! If opening the | |
| 216 * file fails, "fname" is freed. | |
| 217 * | |
| 218 * return value: FAIL if file could not be opened, OK otherwise | |
| 219 */ | |
| 220 int | |
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221 mf_open_file(memfile_T *mfp, char_u *fname) |
| 7 | 222 { |
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223 mf_do_open(mfp, fname, O_RDWR|O_CREAT|O_EXCL); // try to open the file |
| 7 | 224 |
| 225 if (mfp->mf_fd < 0) | |
| 226 return FAIL; | |
| 227 | |
| 228 mfp->mf_dirty = TRUE; | |
| 229 return OK; | |
| 230 } | |
| 231 | |
| 232 /* | |
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233 * Close a memory file and delete the associated file if 'del_file' is TRUE. |
| 7 | 234 */ |
| 235 void | |
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236 mf_close(memfile_T *mfp, int del_file) |
| 7 | 237 { |
| 238 bhdr_T *hp, *nextp; | |
| 239 | |
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240 if (mfp == NULL) // safety check |
| 7 | 241 return; |
| 242 if (mfp->mf_fd >= 0) | |
| 243 { | |
| 244 if (close(mfp->mf_fd) < 0) | |
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245 emsg(_(e_close_error_on_swap_file)); |
| 7 | 246 } |
| 247 if (del_file && mfp->mf_fname != NULL) | |
| 248 mch_remove(mfp->mf_fname); | |
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249 // free entries in used list |
| 7 | 250 for (hp = mfp->mf_used_first; hp != NULL; hp = nextp) |
| 251 { | |
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252 total_mem_used -= (long_u)hp->bh_page_count * mfp->mf_page_size; |
| 7 | 253 nextp = hp->bh_next; |
| 254 mf_free_bhdr(hp); | |
| 255 } | |
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256 while (mfp->mf_free_first != NULL) // free entries in free list |
| 7 | 257 vim_free(mf_rem_free(mfp)); |
| 2730 | 258 mf_hash_free(&mfp->mf_hash); |
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259 mf_hash_free_all(&mfp->mf_trans); // free hashtable and its items |
| 7 | 260 vim_free(mfp->mf_fname); |
| 261 vim_free(mfp->mf_ffname); | |
| 262 vim_free(mfp); | |
| 263 } | |
| 264 | |
| 265 /* | |
| 266 * Close the swap file for a memfile. Used when 'swapfile' is reset. | |
| 267 */ | |
| 268 void | |
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269 mf_close_file( |
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270 buf_T *buf, |
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271 int getlines) // get all lines into memory? |
| 7 | 272 { |
| 273 memfile_T *mfp; | |
| 274 linenr_T lnum; | |
| 275 | |
| 276 mfp = buf->b_ml.ml_mfp; | |
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277 if (mfp == NULL || mfp->mf_fd < 0) // nothing to close |
| 7 | 278 return; |
| 279 | |
| 280 if (getlines) | |
| 281 { | |
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282 // get all blocks in memory by accessing all lines (clumsy!) |
| 1066 | 283 mf_dont_release = TRUE; |
| 7 | 284 for (lnum = 1; lnum <= buf->b_ml.ml_line_count; ++lnum) |
| 285 (void)ml_get_buf(buf, lnum, FALSE); | |
| 1066 | 286 mf_dont_release = FALSE; |
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287 // TODO: should check if all blocks are really in core |
| 7 | 288 } |
| 289 | |
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290 if (close(mfp->mf_fd) < 0) // close the file |
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291 emsg(_(e_close_error_on_swap_file)); |
| 7 | 292 mfp->mf_fd = -1; |
| 293 | |
| 294 if (mfp->mf_fname != NULL) | |
| 295 { | |
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296 mch_remove(mfp->mf_fname); // delete the swap file |
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297 VIM_CLEAR(mfp->mf_fname); |
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298 VIM_CLEAR(mfp->mf_ffname); |
| 7 | 299 } |
| 300 } | |
| 301 | |
| 302 /* | |
| 303 * Set new size for a memfile. Used when block 0 of a swapfile has been read | |
| 304 * and the size it indicates differs from what was guessed. | |
| 305 */ | |
| 306 void | |
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307 mf_new_page_size(memfile_T *mfp, unsigned new_size) |
| 7 | 308 { |
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309 // Correct the memory used for block 0 to the new size, because it will be |
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310 // freed with that size later on. |
| 7 | 311 total_mem_used += new_size - mfp->mf_page_size; |
| 312 mfp->mf_page_size = new_size; | |
| 313 } | |
| 314 | |
| 315 /* | |
| 316 * get a new block | |
| 317 * | |
| 318 * negative: TRUE if negative block number desired (data block) | |
| 319 */ | |
| 320 bhdr_T * | |
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321 mf_new(memfile_T *mfp, int negative, int page_count) |
| 7 | 322 { |
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323 bhdr_T *hp; // new bhdr_T |
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324 bhdr_T *freep; // first block in free list |
| 1166 | 325 char_u *p; |
| 7 | 326 |
| 327 /* | |
| 328 * If we reached the maximum size for the used memory blocks, release one | |
| 329 * If a bhdr_T is returned, use it and adjust the page_count if necessary. | |
| 330 */ | |
| 331 hp = mf_release(mfp, page_count); | |
| 332 | |
| 333 /* | |
| 334 * Decide on the number to use: | |
| 335 * If there is a free block, use its number. | |
| 336 * Otherwise use mf_block_min for a negative number, mf_block_max for | |
| 337 * a positive number. | |
| 338 */ | |
| 339 freep = mfp->mf_free_first; | |
| 340 if (!negative && freep != NULL && freep->bh_page_count >= page_count) | |
| 341 { | |
| 342 /* | |
| 343 * If the block in the free list has more pages, take only the number | |
| 344 * of pages needed and allocate a new bhdr_T with data | |
| 345 * | |
| 1166 | 346 * If the number of pages matches and mf_release() did not return a |
| 347 * bhdr_T, use the bhdr_T from the free list and allocate the data | |
| 7 | 348 * |
| 1166 | 349 * If the number of pages matches and mf_release() returned a bhdr_T, |
| 7 | 350 * just use the number and free the bhdr_T from the free list |
| 351 */ | |
| 352 if (freep->bh_page_count > page_count) | |
| 353 { | |
| 354 if (hp == NULL && (hp = mf_alloc_bhdr(mfp, page_count)) == NULL) | |
| 355 return NULL; | |
| 356 hp->bh_bnum = freep->bh_bnum; | |
| 357 freep->bh_bnum += page_count; | |
| 358 freep->bh_page_count -= page_count; | |
| 359 } | |
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360 else if (hp == NULL) // need to allocate memory for this block |
| 7 | 361 { |
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362 if ((p = alloc((size_t)mfp->mf_page_size * page_count)) == NULL) |
| 7 | 363 return NULL; |
| 364 hp = mf_rem_free(mfp); | |
| 365 hp->bh_data = p; | |
| 366 } | |
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367 else // use the number, remove entry from free list |
| 7 | 368 { |
| 369 freep = mf_rem_free(mfp); | |
| 370 hp->bh_bnum = freep->bh_bnum; | |
| 371 vim_free(freep); | |
| 372 } | |
| 373 } | |
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374 else // get a new number |
| 7 | 375 { |
| 376 if (hp == NULL && (hp = mf_alloc_bhdr(mfp, page_count)) == NULL) | |
| 377 return NULL; | |
| 378 if (negative) | |
| 379 { | |
| 380 hp->bh_bnum = mfp->mf_blocknr_min--; | |
| 381 mfp->mf_neg_count++; | |
| 382 } | |
| 383 else | |
| 384 { | |
| 385 hp->bh_bnum = mfp->mf_blocknr_max; | |
| 386 mfp->mf_blocknr_max += page_count; | |
| 387 } | |
| 388 } | |
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389 hp->bh_flags = BH_LOCKED | BH_DIRTY; // new block is always dirty |
| 7 | 390 mfp->mf_dirty = TRUE; |
| 391 hp->bh_page_count = page_count; | |
| 392 mf_ins_used(mfp, hp); | |
| 393 mf_ins_hash(mfp, hp); | |
| 394 | |
| 395 /* | |
| 396 * Init the data to all zero, to avoid reading uninitialized data. | |
| 397 * This also avoids that the passwd file ends up in the swap file! | |
| 398 */ | |
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399 (void)vim_memset((char *)(hp->bh_data), 0, |
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400 (size_t)mfp->mf_page_size * page_count); |
| 7 | 401 |
| 402 return hp; | |
| 403 } | |
| 404 | |
| 405 /* | |
| 2267 | 406 * Get existing block "nr" with "page_count" pages. |
| 7 | 407 * |
| 408 * Note: The caller should first check a negative nr with mf_trans_del() | |
| 409 */ | |
| 410 bhdr_T * | |
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411 mf_get(memfile_T *mfp, blocknr_T nr, int page_count) |
| 7 | 412 { |
| 413 bhdr_T *hp; | |
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414 // doesn't exist |
| 7 | 415 if (nr >= mfp->mf_blocknr_max || nr <= mfp->mf_blocknr_min) |
| 416 return NULL; | |
| 417 | |
| 418 /* | |
| 419 * see if it is in the cache | |
| 420 */ | |
| 421 hp = mf_find_hash(mfp, nr); | |
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422 if (hp == NULL) // not in the hash list |
| 7 | 423 { |
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424 if (nr < 0 || nr >= mfp->mf_infile_count) // can't be in the file |
| 7 | 425 return NULL; |
| 426 | |
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427 // could check here if the block is in the free list |
| 7 | 428 |
| 429 /* | |
| 430 * Check if we need to flush an existing block. | |
| 431 * If so, use that block. | |
| 432 * If not, allocate a new block. | |
| 433 */ | |
| 434 hp = mf_release(mfp, page_count); | |
| 435 if (hp == NULL && (hp = mf_alloc_bhdr(mfp, page_count)) == NULL) | |
| 436 return NULL; | |
| 437 | |
| 438 hp->bh_bnum = nr; | |
| 439 hp->bh_flags = 0; | |
| 440 hp->bh_page_count = page_count; | |
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441 if (mf_read(mfp, hp) == FAIL) // cannot read the block! |
| 7 | 442 { |
| 443 mf_free_bhdr(hp); | |
| 444 return NULL; | |
| 445 } | |
| 446 } | |
| 447 else | |
| 448 { | |
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449 mf_rem_used(mfp, hp); // remove from list, insert in front below |
| 7 | 450 mf_rem_hash(mfp, hp); |
| 451 } | |
| 452 | |
| 453 hp->bh_flags |= BH_LOCKED; | |
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454 mf_ins_used(mfp, hp); // put in front of used list |
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455 mf_ins_hash(mfp, hp); // put in front of hash list |
| 7 | 456 |
| 457 return hp; | |
| 458 } | |
| 459 | |
| 460 /* | |
| 461 * release the block *hp | |
| 462 * | |
| 463 * dirty: Block must be written to file later | |
| 464 * infile: Block should be in file (needed for recovery) | |
| 465 * | |
| 466 * no return value, function cannot fail | |
| 467 */ | |
| 468 void | |
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469 mf_put( |
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470 memfile_T *mfp, |
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471 bhdr_T *hp, |
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472 int dirty, |
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473 int infile) |
| 7 | 474 { |
| 475 int flags; | |
| 476 | |
| 477 flags = hp->bh_flags; | |
| 478 | |
| 479 if ((flags & BH_LOCKED) == 0) | |
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480 iemsg(_(e_block_was_not_locked)); |
| 7 | 481 flags &= ~BH_LOCKED; |
| 482 if (dirty) | |
| 483 { | |
| 484 flags |= BH_DIRTY; | |
| 485 mfp->mf_dirty = TRUE; | |
| 486 } | |
| 487 hp->bh_flags = flags; | |
| 488 if (infile) | |
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489 mf_trans_add(mfp, hp); // may translate negative in positive nr |
| 7 | 490 } |
| 491 | |
| 492 /* | |
| 493 * block *hp is no longer in used, may put it in the free list of memfile *mfp | |
| 494 */ | |
| 495 void | |
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496 mf_free(memfile_T *mfp, bhdr_T *hp) |
| 7 | 497 { |
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498 vim_free(hp->bh_data); // free the memory |
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499 mf_rem_hash(mfp, hp); // get *hp out of the hash list |
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500 mf_rem_used(mfp, hp); // get *hp out of the used list |
| 7 | 501 if (hp->bh_bnum < 0) |
| 502 { | |
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503 vim_free(hp); // don't want negative numbers in free list |
| 7 | 504 mfp->mf_neg_count--; |
| 505 } | |
| 506 else | |
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507 mf_ins_free(mfp, hp); // put *hp in the free list |
| 7 | 508 } |
| 509 | |
| 510 /* | |
| 511 * Sync the memory file *mfp to disk. | |
| 512 * Flags: | |
| 513 * MFS_ALL If not given, blocks with negative numbers are not synced, | |
| 514 * even when they are dirty! | |
| 515 * MFS_STOP Stop syncing when a character becomes available, but sync at | |
| 516 * least one block. | |
| 517 * MFS_FLUSH Make sure buffers are flushed to disk, so they will survive a | |
| 518 * system crash. | |
| 519 * MFS_ZERO Only write block 0. | |
| 520 * | |
| 521 * Return FAIL for failure, OK otherwise | |
| 522 */ | |
| 523 int | |
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524 mf_sync(memfile_T *mfp, int flags) |
| 7 | 525 { |
| 526 int status; | |
| 527 bhdr_T *hp; | |
| 528 int got_int_save = got_int; | |
| 529 | |
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530 if (mfp->mf_fd < 0) // there is no file, nothing to do |
| 7 | 531 { |
| 532 mfp->mf_dirty = FALSE; | |
| 533 return FAIL; | |
| 534 } | |
| 535 | |
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536 // Only a CTRL-C while writing will break us here, not one typed |
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537 // previously. |
| 7 | 538 got_int = FALSE; |
| 539 | |
| 540 /* | |
| 541 * sync from last to first (may reduce the probability of an inconsistent | |
| 542 * file) If a write fails, it is very likely caused by a full filesystem. | |
| 543 * Then we only try to write blocks within the existing file. If that also | |
| 544 * fails then we give up. | |
| 545 */ | |
| 546 status = OK; | |
| 547 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev) | |
| 548 if (((flags & MFS_ALL) || hp->bh_bnum >= 0) | |
| 549 && (hp->bh_flags & BH_DIRTY) | |
| 550 && (status == OK || (hp->bh_bnum >= 0 | |
| 551 && hp->bh_bnum < mfp->mf_infile_count))) | |
| 552 { | |
| 553 if ((flags & MFS_ZERO) && hp->bh_bnum != 0) | |
| 554 continue; | |
| 555 if (mf_write(mfp, hp) == FAIL) | |
| 556 { | |
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557 if (status == FAIL) // double error: quit syncing |
| 7 | 558 break; |
| 559 status = FAIL; | |
| 560 } | |
| 561 if (flags & MFS_STOP) | |
| 562 { | |
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563 // Stop when char available now. |
| 7 | 564 if (ui_char_avail()) |
| 565 break; | |
| 566 } | |
| 567 else | |
| 568 ui_breakcheck(); | |
| 569 if (got_int) | |
| 570 break; | |
| 571 } | |
| 572 | |
| 573 /* | |
| 574 * If the whole list is flushed, the memfile is not dirty anymore. | |
| 575 * In case of an error this flag is also set, to avoid trying all the time. | |
| 576 */ | |
| 577 if (hp == NULL || status == FAIL) | |
| 578 mfp->mf_dirty = FALSE; | |
| 579 | |
| 580 if ((flags & MFS_FLUSH) && *p_sws != NUL) | |
| 581 { | |
| 582 #if defined(UNIX) | |
| 583 # ifdef HAVE_FSYNC | |
| 584 /* | |
| 585 * most Unixes have the very useful fsync() function, just what we need. | |
| 586 */ | |
| 587 if (STRCMP(p_sws, "fsync") == 0) | |
| 588 { | |
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589 if (vim_fsync(mfp->mf_fd)) |
| 7 | 590 status = FAIL; |
| 591 } | |
| 592 else | |
| 593 # endif | |
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594 // OpenNT is strictly POSIX (Benzinger) |
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595 // Tandem/Himalaya NSK-OSS doesn't have sync() |
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596 // No sync() on Stratus VOS |
| 6637 | 597 # if defined(__OPENNT) || defined(__TANDEM) || defined(__VOS__) |
| 7 | 598 fflush(NULL); |
| 599 # else | |
| 600 sync(); | |
| 601 # endif | |
| 602 #endif | |
| 603 #ifdef VMS | |
| 604 if (STRCMP(p_sws, "fsync") == 0) | |
| 605 { | |
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606 if (vim_fsync(mfp->mf_fd)) |
| 7 | 607 status = FAIL; |
| 608 } | |
| 609 #endif | |
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610 #ifdef MSWIN |
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611 if (_commit(mfp->mf_fd)) |
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612 status = FAIL; |
| 7 | 613 #endif |
| 614 #ifdef AMIGA | |
| 1030 | 615 # if defined(__AROS__) || defined(__amigaos4__) |
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616 if (vim_fsync(mfp->mf_fd) != 0) |
| 7 | 617 status = FAIL; |
| 618 # else | |
| 619 /* | |
| 620 * Flush() only exists for AmigaDos 2.0. | |
| 621 * For 1.3 it should be done with close() + open(), but then the risk | |
| 622 * is that the open() may fail and lose the file.... | |
| 623 */ | |
| 624 # ifdef FEAT_ARP | |
| 625 if (dos2) | |
| 626 # endif | |
| 627 # ifdef SASC | |
| 628 { | |
| 629 struct UFB *fp = chkufb(mfp->mf_fd); | |
| 630 | |
| 631 if (fp != NULL) | |
| 632 Flush(fp->ufbfh); | |
| 633 } | |
| 634 # else | |
| 635 # if defined(_DCC) || defined(__GNUC__) || defined(__MORPHOS__) | |
| 636 { | |
| 984 | 637 # if defined(__GNUC__) && !defined(__MORPHOS__) && defined(__libnix__) |
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638 // Have function (in libnix at least), |
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639 // but ain't got no prototype anywhere. |
| 7 | 640 extern unsigned long fdtofh(int filedescriptor); |
| 641 # endif | |
| 984 | 642 # if !defined(__libnix__) |
| 643 fflush(NULL); | |
| 644 # else | |
| 7 | 645 BPTR fh = (BPTR)fdtofh(mfp->mf_fd); |
| 646 | |
| 647 if (fh != 0) | |
| 648 Flush(fh); | |
| 984 | 649 # endif |
| 7 | 650 } |
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651 # else // assume Manx |
| 7 | 652 Flush(_devtab[mfp->mf_fd].fd); |
| 653 # endif | |
| 654 # endif | |
| 655 # endif | |
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656 #endif // AMIGA |
| 7 | 657 } |
| 658 | |
| 659 got_int |= got_int_save; | |
| 660 | |
| 661 return status; | |
| 662 } | |
| 663 | |
| 664 /* | |
| 630 | 665 * For all blocks in memory file *mfp that have a positive block number set |
| 666 * the dirty flag. These are blocks that need to be written to a newly | |
| 667 * created swapfile. | |
| 668 */ | |
| 669 void | |
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670 mf_set_dirty(memfile_T *mfp) |
| 630 | 671 { |
| 672 bhdr_T *hp; | |
| 673 | |
| 674 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev) | |
| 675 if (hp->bh_bnum > 0) | |
| 676 hp->bh_flags |= BH_DIRTY; | |
| 677 mfp->mf_dirty = TRUE; | |
| 678 } | |
| 679 | |
| 680 /* | |
| 7 | 681 * insert block *hp in front of hashlist of memfile *mfp |
| 682 */ | |
| 683 static void | |
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684 mf_ins_hash(memfile_T *mfp, bhdr_T *hp) |
| 7 | 685 { |
| 2730 | 686 mf_hash_add_item(&mfp->mf_hash, (mf_hashitem_T *)hp); |
| 7 | 687 } |
| 688 | |
| 689 /* | |
| 690 * remove block *hp from hashlist of memfile list *mfp | |
| 691 */ | |
| 692 static void | |
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693 mf_rem_hash(memfile_T *mfp, bhdr_T *hp) |
| 7 | 694 { |
| 2730 | 695 mf_hash_rem_item(&mfp->mf_hash, (mf_hashitem_T *)hp); |
| 7 | 696 } |
| 697 | |
| 698 /* | |
| 699 * look in hash lists of memfile *mfp for block header with number 'nr' | |
| 700 */ | |
| 701 static bhdr_T * | |
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702 mf_find_hash(memfile_T *mfp, blocknr_T nr) |
| 7 | 703 { |
| 2730 | 704 return (bhdr_T *)mf_hash_find(&mfp->mf_hash, nr); |
| 7 | 705 } |
| 706 | |
| 707 /* | |
| 708 * insert block *hp in front of used list of memfile *mfp | |
| 709 */ | |
| 710 static void | |
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711 mf_ins_used(memfile_T *mfp, bhdr_T *hp) |
| 7 | 712 { |
| 713 hp->bh_next = mfp->mf_used_first; | |
| 714 mfp->mf_used_first = hp; | |
| 715 hp->bh_prev = NULL; | |
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716 if (hp->bh_next == NULL) // list was empty, adjust last pointer |
| 7 | 717 mfp->mf_used_last = hp; |
| 718 else | |
| 719 hp->bh_next->bh_prev = hp; | |
| 720 mfp->mf_used_count += hp->bh_page_count; | |
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721 total_mem_used += (long_u)hp->bh_page_count * mfp->mf_page_size; |
| 7 | 722 } |
| 723 | |
| 724 /* | |
| 725 * remove block *hp from used list of memfile *mfp | |
| 726 */ | |
| 727 static void | |
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728 mf_rem_used(memfile_T *mfp, bhdr_T *hp) |
| 7 | 729 { |
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730 if (hp->bh_next == NULL) // last block in used list |
| 7 | 731 mfp->mf_used_last = hp->bh_prev; |
| 732 else | |
| 733 hp->bh_next->bh_prev = hp->bh_prev; | |
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734 if (hp->bh_prev == NULL) // first block in used list |
| 7 | 735 mfp->mf_used_first = hp->bh_next; |
| 736 else | |
| 737 hp->bh_prev->bh_next = hp->bh_next; | |
| 738 mfp->mf_used_count -= hp->bh_page_count; | |
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739 total_mem_used -= (long_u)hp->bh_page_count * mfp->mf_page_size; |
| 7 | 740 } |
| 741 | |
| 742 /* | |
| 743 * Release the least recently used block from the used list if the number | |
| 744 * of used memory blocks gets to big. | |
| 745 * | |
| 746 * Return the block header to the caller, including the memory block, so | |
| 747 * it can be re-used. Make sure the page_count is right. | |
| 6817 | 748 * |
| 749 * Returns NULL if no block is released. | |
| 7 | 750 */ |
| 751 static bhdr_T * | |
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752 mf_release(memfile_T *mfp, int page_count) |
| 7 | 753 { |
| 754 bhdr_T *hp; | |
| 755 int need_release; | |
| 756 buf_T *buf; | |
| 757 | |
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758 // don't release while in mf_close_file() |
| 1066 | 759 if (mf_dont_release) |
| 7 | 760 return NULL; |
| 761 | |
| 762 /* | |
| 763 * Need to release a block if the number of blocks for this memfile is | |
| 764 * higher than the maximum or total memory used is over 'maxmemtot' | |
| 765 */ | |
| 766 need_release = ((mfp->mf_used_count >= mfp->mf_used_count_max) | |
| 767 || (total_mem_used >> 10) >= (long_u)p_mmt); | |
| 768 | |
| 769 /* | |
| 770 * Try to create a swap file if the amount of memory used is getting too | |
| 771 * high. | |
| 772 */ | |
| 773 if (mfp->mf_fd < 0 && need_release && p_uc) | |
| 774 { | |
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775 // find for which buffer this memfile is |
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776 FOR_ALL_BUFFERS(buf) |
| 7 | 777 if (buf->b_ml.ml_mfp == mfp) |
| 778 break; | |
| 779 if (buf != NULL && buf->b_may_swap) | |
| 780 ml_open_file(buf); | |
| 781 } | |
| 782 | |
| 783 /* | |
| 784 * don't release a block if | |
| 785 * there is no file for this memfile | |
| 786 * or | |
| 787 * the number of blocks for this memfile is lower than the maximum | |
| 788 * and | |
| 789 * total memory used is not up to 'maxmemtot' | |
| 790 */ | |
| 791 if (mfp->mf_fd < 0 || !need_release) | |
| 792 return NULL; | |
| 793 | |
| 794 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev) | |
| 795 if (!(hp->bh_flags & BH_LOCKED)) | |
| 796 break; | |
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797 if (hp == NULL) // not a single one that can be released |
| 7 | 798 return NULL; |
| 799 | |
| 800 /* | |
| 801 * If the block is dirty, write it. | |
| 802 * If the write fails we don't free it. | |
| 803 */ | |
| 804 if ((hp->bh_flags & BH_DIRTY) && mf_write(mfp, hp) == FAIL) | |
| 805 return NULL; | |
| 806 | |
| 807 mf_rem_used(mfp, hp); | |
| 808 mf_rem_hash(mfp, hp); | |
| 809 | |
| 810 /* | |
| 811 * If a bhdr_T is returned, make sure that the page_count of bh_data is | |
| 812 * right | |
| 813 */ | |
| 814 if (hp->bh_page_count != page_count) | |
| 815 { | |
| 816 vim_free(hp->bh_data); | |
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817 if ((hp->bh_data = alloc((size_t)mfp->mf_page_size * page_count)) |
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818 == NULL) |
| 7 | 819 { |
| 820 vim_free(hp); | |
| 821 return NULL; | |
| 822 } | |
| 823 hp->bh_page_count = page_count; | |
| 824 } | |
| 825 return hp; | |
| 826 } | |
| 827 | |
| 828 /* | |
| 829 * release as many blocks as possible | |
| 830 * Used in case of out of memory | |
| 831 * | |
| 832 * return TRUE if any memory was released | |
| 833 */ | |
| 834 int | |
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835 mf_release_all(void) |
| 7 | 836 { |
| 837 buf_T *buf; | |
| 838 memfile_T *mfp; | |
| 839 bhdr_T *hp; | |
| 840 int retval = FALSE; | |
| 841 | |
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842 FOR_ALL_BUFFERS(buf) |
| 7 | 843 { |
| 844 mfp = buf->b_ml.ml_mfp; | |
| 845 if (mfp != NULL) | |
| 846 { | |
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847 // If no swap file yet, may open one |
| 7 | 848 if (mfp->mf_fd < 0 && buf->b_may_swap) |
| 849 ml_open_file(buf); | |
| 850 | |
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851 // only if there is a swapfile |
| 7 | 852 if (mfp->mf_fd >= 0) |
| 853 { | |
| 854 for (hp = mfp->mf_used_last; hp != NULL; ) | |
| 855 { | |
| 856 if (!(hp->bh_flags & BH_LOCKED) | |
| 857 && (!(hp->bh_flags & BH_DIRTY) | |
| 858 || mf_write(mfp, hp) != FAIL)) | |
| 859 { | |
| 860 mf_rem_used(mfp, hp); | |
| 861 mf_rem_hash(mfp, hp); | |
| 862 mf_free_bhdr(hp); | |
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863 hp = mfp->mf_used_last; // re-start, list was changed |
| 7 | 864 retval = TRUE; |
| 865 } | |
| 866 else | |
| 867 hp = hp->bh_prev; | |
| 868 } | |
| 869 } | |
| 870 } | |
| 871 } | |
| 872 return retval; | |
| 873 } | |
| 874 | |
| 875 /* | |
| 876 * Allocate a block header and a block of memory for it | |
| 877 */ | |
| 878 static bhdr_T * | |
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879 mf_alloc_bhdr(memfile_T *mfp, int page_count) |
| 7 | 880 { |
| 881 bhdr_T *hp; | |
| 882 | |
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883 if ((hp = ALLOC_ONE(bhdr_T)) != NULL) |
| 7 | 884 { |
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885 if ((hp->bh_data = alloc((size_t)mfp->mf_page_size * page_count)) |
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886 == NULL) |
| 7 | 887 { |
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888 vim_free(hp); // not enough memory |
| 7 | 889 return NULL; |
| 890 } | |
| 891 hp->bh_page_count = page_count; | |
| 892 } | |
| 893 return hp; | |
| 894 } | |
| 895 | |
| 896 /* | |
| 897 * Free a block header and the block of memory for it | |
| 898 */ | |
| 899 static void | |
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900 mf_free_bhdr(bhdr_T *hp) |
| 7 | 901 { |
| 902 vim_free(hp->bh_data); | |
| 903 vim_free(hp); | |
| 904 } | |
| 905 | |
| 906 /* | |
| 907 * insert entry *hp in the free list | |
| 908 */ | |
| 909 static void | |
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910 mf_ins_free(memfile_T *mfp, bhdr_T *hp) |
| 7 | 911 { |
| 912 hp->bh_next = mfp->mf_free_first; | |
| 913 mfp->mf_free_first = hp; | |
| 914 } | |
| 915 | |
| 916 /* | |
| 917 * remove the first entry from the free list and return a pointer to it | |
| 918 * Note: caller must check that mfp->mf_free_first is not NULL! | |
| 919 */ | |
| 920 static bhdr_T * | |
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921 mf_rem_free(memfile_T *mfp) |
| 7 | 922 { |
| 923 bhdr_T *hp; | |
| 924 | |
| 925 hp = mfp->mf_free_first; | |
| 926 mfp->mf_free_first = hp->bh_next; | |
| 927 return hp; | |
| 928 } | |
| 929 | |
| 930 /* | |
| 931 * read a block from disk | |
| 932 * | |
| 933 * Return FAIL for failure, OK otherwise | |
| 934 */ | |
| 935 static int | |
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936 mf_read(memfile_T *mfp, bhdr_T *hp) |
| 7 | 937 { |
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938 off_T offset; |
| 7 | 939 unsigned page_size; |
| 940 unsigned size; | |
| 941 | |
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942 if (mfp->mf_fd < 0) // there is no file, can't read |
| 7 | 943 return FAIL; |
| 944 | |
| 945 page_size = mfp->mf_page_size; | |
|
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946 offset = (off_T)page_size * hp->bh_bnum; |
| 7 | 947 size = page_size * hp->bh_page_count; |
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948 if (vim_lseek(mfp->mf_fd, offset, SEEK_SET) != offset) |
| 7 | 949 { |
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950 PERROR(_(e_seek_error_in_swap_file_read)); |
| 7 | 951 return FAIL; |
| 952 } | |
| 2664 | 953 if ((unsigned)read_eintr(mfp->mf_fd, hp->bh_data, size) != size) |
| 7 | 954 { |
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955 PERROR(_(e_read_error_in_swap_file)); |
| 7 | 956 return FAIL; |
| 957 } | |
| 2267 | 958 |
| 959 #ifdef FEAT_CRYPT | |
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960 // Decrypt if 'key' is set and this is a data block. And when changing the |
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961 // key. |
|
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962 if (*mfp->mf_buffer->b_p_key != NUL || mfp->mf_old_key != NULL) |
| 2267 | 963 ml_decrypt_data(mfp, hp->bh_data, offset, size); |
| 964 #endif | |
| 965 | |
| 7 | 966 return OK; |
| 967 } | |
| 968 | |
| 969 /* | |
| 970 * write a block to disk | |
| 971 * | |
| 972 * Return FAIL for failure, OK otherwise | |
| 973 */ | |
| 974 static int | |
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975 mf_write(memfile_T *mfp, bhdr_T *hp) |
| 7 | 976 { |
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977 off_T offset; // offset in the file |
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978 blocknr_T nr; // block nr which is being written |
| 7 | 979 bhdr_T *hp2; |
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980 unsigned page_size; // number of bytes in a page |
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981 unsigned page_count; // number of pages written |
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982 unsigned size; // number of bytes written |
| 7 | 983 |
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984 if (mfp->mf_fd < 0 && !mfp->mf_reopen) |
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985 // there is no file and there was no file, can't write |
| 7 | 986 return FAIL; |
| 987 | |
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988 if (hp->bh_bnum < 0) // must assign file block number |
| 7 | 989 if (mf_trans_add(mfp, hp) == FAIL) |
| 990 return FAIL; | |
| 991 | |
| 992 page_size = mfp->mf_page_size; | |
| 993 | |
| 994 /* | |
| 995 * We don't want gaps in the file. Write the blocks in front of *hp | |
| 996 * to extend the file. | |
| 997 * If block 'mf_infile_count' is not in the hash list, it has been | |
| 998 * freed. Fill the space in the file with data from the current block. | |
| 999 */ | |
| 1000 for (;;) | |
| 1001 { | |
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1002 int attempt; |
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1003 |
| 7 | 1004 nr = hp->bh_bnum; |
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1005 if (nr > mfp->mf_infile_count) // beyond end of file |
| 7 | 1006 { |
| 1007 nr = mfp->mf_infile_count; | |
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1008 hp2 = mf_find_hash(mfp, nr); // NULL caught below |
| 7 | 1009 } |
| 1010 else | |
| 1011 hp2 = hp; | |
| 1012 | |
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1013 offset = (off_T)page_size * nr; |
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1014 if (hp2 == NULL) // freed block, fill with dummy data |
| 7 | 1015 page_count = 1; |
| 1016 else | |
| 1017 page_count = hp2->bh_page_count; | |
| 1018 size = page_size * page_count; | |
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1019 |
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1020 for (attempt = 1; attempt <= 2; ++attempt) |
| 7 | 1021 { |
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1022 if (mfp->mf_fd >= 0) |
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1023 { |
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1024 if (vim_lseek(mfp->mf_fd, offset, SEEK_SET) != offset) |
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1025 { |
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1026 PERROR(_(e_seek_error_in_swap_file_write)); |
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1027 return FAIL; |
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1028 } |
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1029 if (mf_write_block(mfp, |
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1030 hp2 == NULL ? hp : hp2, offset, size) == OK) |
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1031 break; |
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1032 } |
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1033 |
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1034 if (attempt == 1) |
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1035 { |
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1036 // If the swap file is on a network drive, and the network |
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1037 // gets disconnected and then re-connected, we can maybe fix it |
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1038 // by closing and then re-opening the file. |
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1039 if (mfp->mf_fd >= 0) |
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1040 close(mfp->mf_fd); |
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1041 mfp->mf_fd = mch_open_rw((char *)mfp->mf_fname, mfp->mf_flags); |
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1042 mfp->mf_reopen = (mfp->mf_fd < 0); |
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1043 } |
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1044 if (attempt == 2 || mfp->mf_fd < 0) |
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1045 { |
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1046 // Avoid repeating the error message, this mostly happens when |
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1047 // the disk is full. We give the message again only after a |
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1048 // successful write or when hitting a key. We keep on trying, |
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1049 // in case some space becomes available. |
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1050 if (!did_swapwrite_msg) |
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1051 emsg(_(e_write_error_in_swap_file)); |
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1052 did_swapwrite_msg = TRUE; |
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1053 return FAIL; |
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1054 } |
| 7 | 1055 } |
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1056 |
| 7 | 1057 did_swapwrite_msg = FALSE; |
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1058 if (hp2 != NULL) // written a non-dummy block |
| 7 | 1059 hp2->bh_flags &= ~BH_DIRTY; |
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1060 // appended to the file |
| 7 | 1061 if (nr + (blocknr_T)page_count > mfp->mf_infile_count) |
| 1062 mfp->mf_infile_count = nr + page_count; | |
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1063 if (nr == hp->bh_bnum) // written the desired block |
| 7 | 1064 break; |
| 1065 } | |
| 1066 return OK; | |
| 1067 } | |
| 1068 | |
| 1069 /* | |
| 2267 | 1070 * Write block "hp" with data size "size" to file "mfp->mf_fd". |
| 1071 * Takes care of encryption. | |
| 1072 * Return FAIL or OK. | |
| 1073 */ | |
| 1074 static int | |
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1075 mf_write_block( |
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1076 memfile_T *mfp, |
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1077 bhdr_T *hp, |
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1078 off_T offset UNUSED, |
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1079 unsigned size) |
| 2267 | 1080 { |
| 1081 char_u *data = hp->bh_data; | |
| 1082 int result = OK; | |
| 1083 | |
| 1084 #ifdef FEAT_CRYPT | |
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1085 // Encrypt if 'key' is set and this is a data block. |
| 2267 | 1086 if (*mfp->mf_buffer->b_p_key != NUL) |
| 1087 { | |
| 1088 data = ml_encrypt_data(mfp, data, offset, size); | |
| 1089 if (data == NULL) | |
| 1090 return FAIL; | |
| 1091 } | |
| 1092 #endif | |
| 1093 | |
| 2664 | 1094 if ((unsigned)write_eintr(mfp->mf_fd, data, size) != size) |
| 2267 | 1095 result = FAIL; |
| 1096 | |
| 1097 #ifdef FEAT_CRYPT | |
| 1098 if (data != hp->bh_data) | |
| 1099 vim_free(data); | |
| 1100 #endif | |
| 1101 | |
| 1102 return result; | |
| 1103 } | |
| 1104 | |
| 1105 /* | |
| 7 | 1106 * Make block number for *hp positive and add it to the translation list |
| 1107 * | |
| 1108 * Return FAIL for failure, OK otherwise | |
| 1109 */ | |
| 1110 static int | |
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1111 mf_trans_add(memfile_T *mfp, bhdr_T *hp) |
| 7 | 1112 { |
| 1113 bhdr_T *freep; | |
| 1114 blocknr_T new_bnum; | |
| 1115 NR_TRANS *np; | |
| 1116 int page_count; | |
| 1117 | |
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1118 if (hp->bh_bnum >= 0) // it's already positive |
| 7 | 1119 return OK; |
| 1120 | |
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1121 if ((np = ALLOC_ONE(NR_TRANS)) == NULL) |
| 7 | 1122 return FAIL; |
| 1123 | |
| 1124 /* | |
| 2267 | 1125 * Get a new number for the block. |
| 7 | 1126 * If the first item in the free list has sufficient pages, use its number |
| 1127 * Otherwise use mf_blocknr_max. | |
| 1128 */ | |
| 1129 freep = mfp->mf_free_first; | |
| 1130 page_count = hp->bh_page_count; | |
| 1131 if (freep != NULL && freep->bh_page_count >= page_count) | |
| 1132 { | |
| 1133 new_bnum = freep->bh_bnum; | |
| 1134 /* | |
| 4352 | 1135 * If the page count of the free block was larger, reduce it. |
| 7 | 1136 * If the page count matches, remove the block from the free list |
| 1137 */ | |
| 1138 if (freep->bh_page_count > page_count) | |
| 1139 { | |
| 1140 freep->bh_bnum += page_count; | |
| 1141 freep->bh_page_count -= page_count; | |
| 1142 } | |
| 1143 else | |
| 1144 { | |
| 1145 freep = mf_rem_free(mfp); | |
| 1146 vim_free(freep); | |
| 1147 } | |
| 1148 } | |
| 1149 else | |
| 1150 { | |
| 1151 new_bnum = mfp->mf_blocknr_max; | |
| 1152 mfp->mf_blocknr_max += page_count; | |
| 1153 } | |
| 1154 | |
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1155 np->nt_old_bnum = hp->bh_bnum; // adjust number |
| 7 | 1156 np->nt_new_bnum = new_bnum; |
| 1157 | |
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1158 mf_rem_hash(mfp, hp); // remove from old hash list |
| 7 | 1159 hp->bh_bnum = new_bnum; |
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1160 mf_ins_hash(mfp, hp); // insert in new hash list |
| 7 | 1161 |
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1162 // Insert "np" into "mf_trans" hashtable with key "np->nt_old_bnum" |
| 2730 | 1163 mf_hash_add_item(&mfp->mf_trans, (mf_hashitem_T *)np); |
| 7 | 1164 |
| 1165 return OK; | |
| 1166 } | |
| 1167 | |
| 1168 /* | |
| 6817 | 1169 * Lookup a translation from the trans lists and delete the entry. |
| 7 | 1170 * |
| 1171 * Return the positive new number when found, the old number when not found | |
| 1172 */ | |
| 1173 blocknr_T | |
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1174 mf_trans_del(memfile_T *mfp, blocknr_T old_nr) |
| 7 | 1175 { |
| 1176 NR_TRANS *np; | |
| 1177 blocknr_T new_bnum; | |
| 1178 | |
| 2730 | 1179 np = (NR_TRANS *)mf_hash_find(&mfp->mf_trans, old_nr); |
| 1180 | |
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1181 if (np == NULL) // not found |
| 7 | 1182 return old_nr; |
| 1183 | |
| 1184 mfp->mf_neg_count--; | |
| 1185 new_bnum = np->nt_new_bnum; | |
| 2730 | 1186 |
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1187 // remove entry from the trans list |
| 2730 | 1188 mf_hash_rem_item(&mfp->mf_trans, (mf_hashitem_T *)np); |
| 1189 | |
| 7 | 1190 vim_free(np); |
| 1191 | |
| 1192 return new_bnum; | |
| 1193 } | |
| 1194 | |
| 1195 /* | |
| 1196 * Set mfp->mf_ffname according to mfp->mf_fname and some other things. | |
| 1197 * Only called when creating or renaming the swapfile. Either way it's a new | |
| 1198 * name so we must work out the full path name. | |
| 1199 */ | |
| 1200 void | |
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1201 mf_set_ffname(memfile_T *mfp) |
| 7 | 1202 { |
| 1203 mfp->mf_ffname = FullName_save(mfp->mf_fname, FALSE); | |
| 1204 } | |
| 1205 | |
| 1206 /* | |
| 1207 * Make the name of the file used for the memfile a full path. | |
| 1208 * Used before doing a :cd | |
| 1209 */ | |
| 1210 void | |
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1211 mf_fullname(memfile_T *mfp) |
| 7 | 1212 { |
| 1213 if (mfp != NULL && mfp->mf_fname != NULL && mfp->mf_ffname != NULL) | |
| 1214 { | |
| 1215 vim_free(mfp->mf_fname); | |
| 1216 mfp->mf_fname = mfp->mf_ffname; | |
| 1217 mfp->mf_ffname = NULL; | |
| 1218 } | |
| 1219 } | |
| 1220 | |
| 1221 /* | |
| 1222 * return TRUE if there are any translations pending for 'mfp' | |
| 1223 */ | |
| 1224 int | |
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1225 mf_need_trans(memfile_T *mfp) |
| 7 | 1226 { |
| 1227 return (mfp->mf_fname != NULL && mfp->mf_neg_count > 0); | |
| 1228 } | |
| 1229 | |
| 1230 /* | |
| 1231 * Open a swap file for a memfile. | |
| 1232 * The "fname" must be in allocated memory, and is consumed (also when an | |
| 1233 * error occurs). | |
| 1234 */ | |
| 1235 static void | |
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1236 mf_do_open( |
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1237 memfile_T *mfp, |
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1238 char_u *fname, |
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1239 int flags) // flags for open() |
| 7 | 1240 { |
| 1241 #ifdef HAVE_LSTAT | |
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1242 stat_T sb; |
| 7 | 1243 #endif |
| 1244 | |
| 1245 mfp->mf_fname = fname; | |
| 1246 | |
| 1247 /* | |
| 1248 * Get the full path name before the open, because this is | |
| 1249 * not possible after the open on the Amiga. | |
| 1250 * fname cannot be NameBuff, because it must have been allocated. | |
| 1251 */ | |
| 1252 mf_set_ffname(mfp); | |
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1253 #if defined(MSWIN) |
| 7 | 1254 /* |
| 4352 | 1255 * A ":!cd e:xxx" may change the directory without us knowing, use the |
| 7 | 1256 * full pathname always. Careful: This frees fname! |
| 1257 */ | |
| 1258 mf_fullname(mfp); | |
| 1259 #endif | |
| 1260 | |
| 1261 #ifdef HAVE_LSTAT | |
| 1262 /* | |
| 1263 * Extra security check: When creating a swap file it really shouldn't | |
| 1264 * exist yet. If there is a symbolic link, this is most likely an attack. | |
| 1265 */ | |
| 1266 if ((flags & O_CREAT) && mch_lstat((char *)mfp->mf_fname, &sb) >= 0) | |
| 1267 { | |
| 1268 mfp->mf_fd = -1; | |
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1269 emsg(_(e_swap_file_already_exists_symlink_attack)); |
| 7 | 1270 } |
| 1271 else | |
| 1272 #endif | |
| 1273 { | |
| 1274 /* | |
| 1275 * try to open the file | |
| 1276 */ | |
| 557 | 1277 flags |= O_EXTRA | O_NOFOLLOW; |
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1278 #ifdef MSWIN |
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1279 // Prevent handle inheritance that cause problems with Cscope |
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1280 // (swap file may not be deleted if cscope connection was open after |
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1281 // the file) |
| 7 | 1282 flags |= O_NOINHERIT; |
| 1283 #endif | |
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1284 mfp->mf_flags = flags; |
| 7 | 1285 mfp->mf_fd = mch_open_rw((char *)mfp->mf_fname, flags); |
| 1286 } | |
| 1287 | |
| 1288 /* | |
| 1289 * If the file cannot be opened, use memory only | |
| 1290 */ | |
| 1291 if (mfp->mf_fd < 0) | |
| 1292 { | |
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1293 VIM_CLEAR(mfp->mf_fname); |
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1294 VIM_CLEAR(mfp->mf_ffname); |
| 7 | 1295 } |
| 1296 else | |
| 1583 | 1297 { |
| 2003 | 1298 #ifdef HAVE_FD_CLOEXEC |
| 1299 int fdflags = fcntl(mfp->mf_fd, F_GETFD); | |
| 1300 if (fdflags >= 0 && (fdflags & FD_CLOEXEC) == 0) | |
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1301 (void)fcntl(mfp->mf_fd, F_SETFD, fdflags | FD_CLOEXEC); |
| 2003 | 1302 #endif |
| 5788 | 1303 #if defined(HAVE_SELINUX) || defined(HAVE_SMACK) |
| 1583 | 1304 mch_copy_sec(fname, mfp->mf_fname); |
| 1305 #endif | |
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1306 mch_hide(mfp->mf_fname); // try setting the 'hidden' flag |
| 1583 | 1307 } |
| 7 | 1308 } |
| 2730 | 1309 |
| 1310 /* | |
| 1311 * Implementation of mf_hashtab_T follows. | |
| 1312 */ | |
| 1313 | |
| 1314 /* | |
| 1315 * The number of buckets in the hashtable is increased by a factor of | |
| 1316 * MHT_GROWTH_FACTOR when the average number of items per bucket | |
| 1317 * exceeds 2 ^ MHT_LOG_LOAD_FACTOR. | |
| 1318 */ | |
| 1319 #define MHT_LOG_LOAD_FACTOR 6 | |
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1320 #define MHT_GROWTH_FACTOR 2 // must be a power of two |
| 2730 | 1321 |
| 1322 /* | |
| 1323 * Initialize an empty hash table. | |
| 1324 */ | |
| 1325 static void | |
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1326 mf_hash_init(mf_hashtab_T *mht) |
| 2730 | 1327 { |
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1328 CLEAR_POINTER(mht); |
| 2730 | 1329 mht->mht_buckets = mht->mht_small_buckets; |
| 1330 mht->mht_mask = MHT_INIT_SIZE - 1; | |
| 1331 } | |
| 1332 | |
| 1333 /* | |
| 1334 * Free the array of a hash table. Does not free the items it contains! | |
| 1335 * The hash table must not be used again without another mf_hash_init() call. | |
| 1336 */ | |
| 1337 static void | |
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1338 mf_hash_free(mf_hashtab_T *mht) |
| 2730 | 1339 { |
| 1340 if (mht->mht_buckets != mht->mht_small_buckets) | |
| 1341 vim_free(mht->mht_buckets); | |
| 1342 } | |
| 1343 | |
| 1344 /* | |
| 1345 * Free the array of a hash table and all the items it contains. | |
| 1346 */ | |
| 1347 static void | |
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1348 mf_hash_free_all(mf_hashtab_T *mht) |
| 2730 | 1349 { |
| 1350 long_u idx; | |
| 1351 mf_hashitem_T *mhi; | |
| 1352 mf_hashitem_T *next; | |
| 1353 | |
| 1354 for (idx = 0; idx <= mht->mht_mask; idx++) | |
| 1355 for (mhi = mht->mht_buckets[idx]; mhi != NULL; mhi = next) | |
| 1356 { | |
| 1357 next = mhi->mhi_next; | |
| 1358 vim_free(mhi); | |
| 1359 } | |
| 1360 | |
| 1361 mf_hash_free(mht); | |
| 1362 } | |
| 1363 | |
| 1364 /* | |
| 1365 * Find "key" in hashtable "mht". | |
| 1366 * Returns a pointer to a mf_hashitem_T or NULL if the item was not found. | |
| 1367 */ | |
| 1368 static mf_hashitem_T * | |
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1369 mf_hash_find(mf_hashtab_T *mht, blocknr_T key) |
| 2730 | 1370 { |
| 1371 mf_hashitem_T *mhi; | |
| 1372 | |
| 1373 mhi = mht->mht_buckets[key & mht->mht_mask]; | |
| 1374 while (mhi != NULL && mhi->mhi_key != key) | |
| 1375 mhi = mhi->mhi_next; | |
| 1376 | |
| 1377 return mhi; | |
| 1378 } | |
| 1379 | |
| 1380 /* | |
| 1381 * Add item "mhi" to hashtable "mht". | |
| 1382 * "mhi" must not be NULL. | |
| 1383 */ | |
| 1384 static void | |
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1385 mf_hash_add_item(mf_hashtab_T *mht, mf_hashitem_T *mhi) |
| 2730 | 1386 { |
| 1387 long_u idx; | |
| 1388 | |
| 1389 idx = mhi->mhi_key & mht->mht_mask; | |
| 1390 mhi->mhi_next = mht->mht_buckets[idx]; | |
| 1391 mhi->mhi_prev = NULL; | |
| 1392 if (mhi->mhi_next != NULL) | |
| 1393 mhi->mhi_next->mhi_prev = mhi; | |
| 1394 mht->mht_buckets[idx] = mhi; | |
| 1395 | |
| 1396 mht->mht_count++; | |
| 1397 | |
| 1398 /* | |
| 1399 * Grow hashtable when we have more thank 2^MHT_LOG_LOAD_FACTOR | |
| 1400 * items per bucket on average | |
| 1401 */ | |
| 1402 if (mht->mht_fixed == 0 | |
| 1403 && (mht->mht_count >> MHT_LOG_LOAD_FACTOR) > mht->mht_mask) | |
| 1404 { | |
| 1405 if (mf_hash_grow(mht) == FAIL) | |
| 1406 { | |
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1407 // stop trying to grow after first failure to allocate memory |
| 2730 | 1408 mht->mht_fixed = 1; |
| 1409 } | |
| 1410 } | |
| 1411 } | |
| 1412 | |
| 1413 /* | |
| 1414 * Remove item "mhi" from hashtable "mht". | |
| 1415 * "mhi" must not be NULL and must have been inserted into "mht". | |
| 1416 */ | |
| 1417 static void | |
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1418 mf_hash_rem_item(mf_hashtab_T *mht, mf_hashitem_T *mhi) |
| 2730 | 1419 { |
| 1420 if (mhi->mhi_prev == NULL) | |
| 1421 mht->mht_buckets[mhi->mhi_key & mht->mht_mask] = mhi->mhi_next; | |
| 1422 else | |
| 1423 mhi->mhi_prev->mhi_next = mhi->mhi_next; | |
| 1424 | |
| 1425 if (mhi->mhi_next != NULL) | |
| 1426 mhi->mhi_next->mhi_prev = mhi->mhi_prev; | |
| 1427 | |
| 1428 mht->mht_count--; | |
| 1429 | |
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1430 // We could shrink the table here, but it typically takes little memory, |
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1431 // so why bother? |
| 2730 | 1432 } |
| 1433 | |
| 1434 /* | |
| 1435 * Increase number of buckets in the hashtable by MHT_GROWTH_FACTOR and | |
| 1436 * rehash items. | |
| 1437 * Returns FAIL when out of memory. | |
| 1438 */ | |
| 1439 static int | |
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1440 mf_hash_grow(mf_hashtab_T *mht) |
| 2730 | 1441 { |
| 1442 long_u i, j; | |
| 1443 int shift; | |
| 1444 mf_hashitem_T *mhi; | |
| 1445 mf_hashitem_T *tails[MHT_GROWTH_FACTOR]; | |
| 1446 mf_hashitem_T **buckets; | |
| 1447 size_t size; | |
| 1448 | |
| 1449 size = (mht->mht_mask + 1) * MHT_GROWTH_FACTOR * sizeof(void *); | |
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1450 buckets = lalloc_clear(size, FALSE); |
| 2730 | 1451 if (buckets == NULL) |
| 1452 return FAIL; | |
| 1453 | |
| 1454 shift = 0; | |
| 1455 while ((mht->mht_mask >> shift) != 0) | |
| 1456 shift++; | |
| 1457 | |
| 1458 for (i = 0; i <= mht->mht_mask; i++) | |
| 1459 { | |
| 1460 /* | |
| 1461 * Traverse the items in the i-th original bucket and move them into | |
| 1462 * MHT_GROWTH_FACTOR new buckets, preserving their relative order | |
| 1463 * within each new bucket. Preserving the order is important because | |
| 1464 * mf_get() tries to keep most recently used items at the front of | |
| 1465 * each bucket. | |
| 1466 * | |
| 1467 * Here we strongly rely on the fact the hashes are computed modulo | |
| 1468 * a power of two. | |
| 1469 */ | |
| 1470 | |
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1471 CLEAR_FIELD(tails); |
| 2730 | 1472 |
| 1473 for (mhi = mht->mht_buckets[i]; mhi != NULL; mhi = mhi->mhi_next) | |
| 1474 { | |
| 1475 j = (mhi->mhi_key >> shift) & (MHT_GROWTH_FACTOR - 1); | |
| 1476 if (tails[j] == NULL) | |
| 1477 { | |
| 1478 buckets[i + (j << shift)] = mhi; | |
| 1479 tails[j] = mhi; | |
| 1480 mhi->mhi_prev = NULL; | |
| 1481 } | |
| 1482 else | |
| 1483 { | |
| 1484 tails[j]->mhi_next = mhi; | |
| 1485 mhi->mhi_prev = tails[j]; | |
| 1486 tails[j] = mhi; | |
| 1487 } | |
| 1488 } | |
| 1489 | |
| 1490 for (j = 0; j < MHT_GROWTH_FACTOR; j++) | |
| 1491 if (tails[j] != NULL) | |
| 1492 tails[j]->mhi_next = NULL; | |
| 1493 } | |
| 1494 | |
| 1495 if (mht->mht_buckets != mht->mht_small_buckets) | |
| 1496 vim_free(mht->mht_buckets); | |
| 1497 | |
| 1498 mht->mht_buckets = buckets; | |
| 1499 mht->mht_mask = (mht->mht_mask + 1) * MHT_GROWTH_FACTOR - 1; | |
| 1500 | |
| 1501 return OK; | |
| 1502 } |