Mercurial > vim
annotate src/memfile.c @ 28677:aefbe6115141
Added tag v8.2.4862 for changeset 89ff3a0fff822dc5493759a9db9ad89a2a29f254
| author | Bram Moolenaar <Bram@vim.org> |
|---|---|
| date | Wed, 04 May 2022 17:30:04 +0200 |
| parents | 7a64222fad8e |
| children | 238ca27dbfd2 |
| 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 | |
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60 # include <ios1.h> // for chkufb() |
| 7 | 61 # endif |
| 62 #endif | |
| 63 | |
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64 #define MEMFILE_PAGE_SIZE 4096 // default page size |
| 7 | 65 |
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66 static long_u total_mem_used = 0; // total memory used for memfiles |
| 7 | 67 |
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68 static void mf_ins_hash(memfile_T *, bhdr_T *); |
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69 static void mf_rem_hash(memfile_T *, bhdr_T *); |
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70 static bhdr_T *mf_find_hash(memfile_T *, blocknr_T); |
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71 static void mf_ins_used(memfile_T *, bhdr_T *); |
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72 static void mf_rem_used(memfile_T *, bhdr_T *); |
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73 static bhdr_T *mf_release(memfile_T *, int); |
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74 static bhdr_T *mf_alloc_bhdr(memfile_T *, int); |
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75 static void mf_free_bhdr(bhdr_T *); |
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76 static void mf_ins_free(memfile_T *, bhdr_T *); |
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77 static bhdr_T *mf_rem_free(memfile_T *); |
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78 static int mf_read(memfile_T *, bhdr_T *); |
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79 static int mf_write(memfile_T *, bhdr_T *); |
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80 static int mf_write_block(memfile_T *mfp, bhdr_T *hp, off_T offset, unsigned size); |
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81 static int mf_trans_add(memfile_T *, bhdr_T *); |
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82 static void mf_do_open(memfile_T *, char_u *, int); |
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83 static void mf_hash_init(mf_hashtab_T *); |
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84 static void mf_hash_free(mf_hashtab_T *); |
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85 static void mf_hash_free_all(mf_hashtab_T *); |
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86 static mf_hashitem_T *mf_hash_find(mf_hashtab_T *, blocknr_T); |
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87 static void mf_hash_add_item(mf_hashtab_T *, mf_hashitem_T *); |
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88 static void mf_hash_rem_item(mf_hashtab_T *, mf_hashitem_T *); |
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89 static int mf_hash_grow(mf_hashtab_T *); |
| 7 | 90 |
| 91 /* | |
| 92 * The functions for using a memfile: | |
| 93 * | |
| 94 * mf_open() open a new or existing memfile | |
| 95 * mf_open_file() open a swap file for an existing memfile | |
| 96 * mf_close() close (and delete) a memfile | |
| 97 * mf_new() create a new block in a memfile and lock it | |
| 98 * mf_get() get an existing block and lock it | |
| 99 * mf_put() unlock a block, may be marked for writing | |
| 100 * mf_free() remove a block | |
| 101 * mf_sync() sync changed parts of memfile to disk | |
| 102 * mf_release_all() release as much memory as possible | |
| 103 * mf_trans_del() may translate negative to positive block number | |
| 104 * mf_fullname() make file name full path (use before first :cd) | |
| 105 */ | |
| 106 | |
| 107 /* | |
| 108 * Open an existing or new memory block file. | |
| 109 * | |
| 110 * fname: name of file to use (NULL means no file at all) | |
| 111 * Note: fname must have been allocated, it is not copied! | |
| 112 * If opening the file fails, fname is freed. | |
| 113 * flags: flags for open() call | |
| 114 * | |
| 115 * If fname != NULL and file cannot be opened, fail. | |
| 116 * | |
| 117 * return value: identifier for this memory block file. | |
| 118 */ | |
| 119 memfile_T * | |
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120 mf_open(char_u *fname, int flags) |
| 7 | 121 { |
| 122 memfile_T *mfp; | |
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123 off_T size; |
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124 #if defined(STATFS) && defined(UNIX) && !defined(__QNX__) && !defined(__minix) |
| 7 | 125 # define USE_FSTATFS |
| 126 struct STATFS stf; | |
| 127 #endif | |
| 128 | |
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129 if ((mfp = ALLOC_ONE(memfile_T)) == NULL) |
| 7 | 130 return NULL; |
| 131 | |
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132 if (fname == NULL) // no file for this memfile, use memory only |
| 7 | 133 { |
| 134 mfp->mf_fname = NULL; | |
| 135 mfp->mf_ffname = NULL; | |
| 136 mfp->mf_fd = -1; | |
| 137 } | |
| 138 else | |
| 139 { | |
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140 mf_do_open(mfp, fname, flags); // try to open the file |
| 7 | 141 |
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142 // if the file cannot be opened, return here |
| 7 | 143 if (mfp->mf_fd < 0) |
| 144 { | |
| 145 vim_free(mfp); | |
| 146 return NULL; | |
| 147 } | |
| 148 } | |
| 149 | |
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150 mfp->mf_free_first = NULL; // free list is empty |
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151 mfp->mf_used_first = NULL; // used list is empty |
| 7 | 152 mfp->mf_used_last = NULL; |
| 153 mfp->mf_dirty = FALSE; | |
| 154 mfp->mf_used_count = 0; | |
| 2730 | 155 mf_hash_init(&mfp->mf_hash); |
| 156 mf_hash_init(&mfp->mf_trans); | |
| 7 | 157 mfp->mf_page_size = MEMFILE_PAGE_SIZE; |
| 2267 | 158 #ifdef FEAT_CRYPT |
| 159 mfp->mf_old_key = NULL; | |
| 160 #endif | |
| 7 | 161 |
| 162 #ifdef USE_FSTATFS | |
| 163 /* | |
| 164 * Try to set the page size equal to the block size of the device. | |
| 165 * Speeds up I/O a lot. | |
| 166 * When recovering, the actual block size will be retrieved from block 0 | |
| 167 * in ml_recover(). The size used here may be wrong, therefore | |
| 168 * mf_blocknr_max must be rounded up. | |
| 169 */ | |
| 170 if (mfp->mf_fd >= 0 | |
| 171 && fstatfs(mfp->mf_fd, &stf, sizeof(struct statfs), 0) == 0 | |
| 172 && stf.F_BSIZE >= MIN_SWAP_PAGE_SIZE | |
| 173 && stf.F_BSIZE <= MAX_SWAP_PAGE_SIZE) | |
| 174 mfp->mf_page_size = stf.F_BSIZE; | |
| 175 #endif | |
| 176 | |
| 177 if (mfp->mf_fd < 0 || (flags & (O_TRUNC|O_EXCL)) | |
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178 || (size = vim_lseek(mfp->mf_fd, (off_T)0L, SEEK_END)) <= 0) |
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179 mfp->mf_blocknr_max = 0; // no file or empty file |
| 7 | 180 else |
| 181 mfp->mf_blocknr_max = (blocknr_T)((size + mfp->mf_page_size - 1) | |
| 182 / mfp->mf_page_size); | |
| 183 mfp->mf_blocknr_min = -1; | |
| 184 mfp->mf_neg_count = 0; | |
| 185 mfp->mf_infile_count = mfp->mf_blocknr_max; | |
| 1230 | 186 |
| 187 /* | |
| 188 * Compute maximum number of pages ('maxmem' is in Kbyte): | |
| 189 * 'mammem' * 1Kbyte / page-size-in-bytes. | |
| 190 * Avoid overflow by first reducing page size as much as possible. | |
| 191 */ | |
| 192 { | |
| 193 int shift = 10; | |
| 194 unsigned page_size = mfp->mf_page_size; | |
| 195 | |
| 196 while (shift > 0 && (page_size & 1) == 0) | |
| 197 { | |
| 198 page_size = page_size >> 1; | |
| 199 --shift; | |
| 200 } | |
| 201 mfp->mf_used_count_max = (p_mm << shift) / page_size; | |
| 202 if (mfp->mf_used_count_max < 10) | |
| 203 mfp->mf_used_count_max = 10; | |
| 204 } | |
| 7 | 205 |
| 206 return mfp; | |
| 207 } | |
| 208 | |
| 209 /* | |
| 210 * Open a file for an existing memfile. Used when updatecount set from 0 to | |
| 211 * some value. | |
| 212 * If the file already exists, this fails. | |
| 213 * "fname" is the name of file to use (NULL means no file at all) | |
| 214 * Note: "fname" must have been allocated, it is not copied! If opening the | |
| 215 * file fails, "fname" is freed. | |
| 216 * | |
| 217 * return value: FAIL if file could not be opened, OK otherwise | |
| 218 */ | |
| 219 int | |
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220 mf_open_file(memfile_T *mfp, char_u *fname) |
| 7 | 221 { |
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222 mf_do_open(mfp, fname, O_RDWR|O_CREAT|O_EXCL); // try to open the file |
| 7 | 223 |
| 224 if (mfp->mf_fd < 0) | |
| 225 return FAIL; | |
| 226 | |
| 227 mfp->mf_dirty = TRUE; | |
| 228 return OK; | |
| 229 } | |
| 230 | |
| 231 /* | |
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232 * Close a memory file and delete the associated file if 'del_file' is TRUE. |
| 7 | 233 */ |
| 234 void | |
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235 mf_close(memfile_T *mfp, int del_file) |
| 7 | 236 { |
| 237 bhdr_T *hp, *nextp; | |
| 238 | |
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239 if (mfp == NULL) // safety check |
| 7 | 240 return; |
| 241 if (mfp->mf_fd >= 0) | |
| 242 { | |
| 243 if (close(mfp->mf_fd) < 0) | |
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244 emsg(_(e_close_error_on_swap_file)); |
| 7 | 245 } |
| 246 if (del_file && mfp->mf_fname != NULL) | |
| 247 mch_remove(mfp->mf_fname); | |
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248 // free entries in used list |
| 7 | 249 for (hp = mfp->mf_used_first; hp != NULL; hp = nextp) |
| 250 { | |
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251 total_mem_used -= (long_u)hp->bh_page_count * mfp->mf_page_size; |
| 7 | 252 nextp = hp->bh_next; |
| 253 mf_free_bhdr(hp); | |
| 254 } | |
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255 while (mfp->mf_free_first != NULL) // free entries in free list |
| 7 | 256 vim_free(mf_rem_free(mfp)); |
| 2730 | 257 mf_hash_free(&mfp->mf_hash); |
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258 mf_hash_free_all(&mfp->mf_trans); // free hashtable and its items |
| 7 | 259 vim_free(mfp->mf_fname); |
| 260 vim_free(mfp->mf_ffname); | |
| 261 vim_free(mfp); | |
| 262 } | |
| 263 | |
| 264 /* | |
| 265 * Close the swap file for a memfile. Used when 'swapfile' is reset. | |
| 266 */ | |
| 267 void | |
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268 mf_close_file( |
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269 buf_T *buf, |
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270 int getlines) // get all lines into memory? |
| 7 | 271 { |
| 272 memfile_T *mfp; | |
| 273 linenr_T lnum; | |
| 274 | |
| 275 mfp = buf->b_ml.ml_mfp; | |
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276 if (mfp == NULL || mfp->mf_fd < 0) // nothing to close |
| 7 | 277 return; |
| 278 | |
| 279 if (getlines) | |
| 280 { | |
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281 // get all blocks in memory by accessing all lines (clumsy!) |
| 1066 | 282 mf_dont_release = TRUE; |
| 7 | 283 for (lnum = 1; lnum <= buf->b_ml.ml_line_count; ++lnum) |
| 284 (void)ml_get_buf(buf, lnum, FALSE); | |
| 1066 | 285 mf_dont_release = FALSE; |
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286 // TODO: should check if all blocks are really in core |
| 7 | 287 } |
| 288 | |
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289 if (close(mfp->mf_fd) < 0) // close the file |
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290 emsg(_(e_close_error_on_swap_file)); |
| 7 | 291 mfp->mf_fd = -1; |
| 292 | |
| 293 if (mfp->mf_fname != NULL) | |
| 294 { | |
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295 mch_remove(mfp->mf_fname); // delete the swap file |
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296 VIM_CLEAR(mfp->mf_fname); |
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297 VIM_CLEAR(mfp->mf_ffname); |
| 7 | 298 } |
| 299 } | |
| 300 | |
| 301 /* | |
| 302 * Set new size for a memfile. Used when block 0 of a swapfile has been read | |
| 303 * and the size it indicates differs from what was guessed. | |
| 304 */ | |
| 305 void | |
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306 mf_new_page_size(memfile_T *mfp, unsigned new_size) |
| 7 | 307 { |
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308 // Correct the memory used for block 0 to the new size, because it will be |
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309 // freed with that size later on. |
| 7 | 310 total_mem_used += new_size - mfp->mf_page_size; |
| 311 mfp->mf_page_size = new_size; | |
| 312 } | |
| 313 | |
| 314 /* | |
| 315 * get a new block | |
| 316 * | |
| 317 * negative: TRUE if negative block number desired (data block) | |
| 318 */ | |
| 319 bhdr_T * | |
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320 mf_new(memfile_T *mfp, int negative, int page_count) |
| 7 | 321 { |
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322 bhdr_T *hp; // new bhdr_T |
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323 bhdr_T *freep; // first block in free list |
| 1166 | 324 char_u *p; |
| 7 | 325 |
| 326 /* | |
| 327 * If we reached the maximum size for the used memory blocks, release one | |
| 328 * If a bhdr_T is returned, use it and adjust the page_count if necessary. | |
| 329 */ | |
| 330 hp = mf_release(mfp, page_count); | |
| 331 | |
| 332 /* | |
| 333 * Decide on the number to use: | |
| 334 * If there is a free block, use its number. | |
| 335 * Otherwise use mf_block_min for a negative number, mf_block_max for | |
| 336 * a positive number. | |
| 337 */ | |
| 338 freep = mfp->mf_free_first; | |
| 339 if (!negative && freep != NULL && freep->bh_page_count >= page_count) | |
| 340 { | |
| 341 /* | |
| 342 * If the block in the free list has more pages, take only the number | |
| 343 * of pages needed and allocate a new bhdr_T with data | |
| 344 * | |
| 1166 | 345 * If the number of pages matches and mf_release() did not return a |
| 346 * bhdr_T, use the bhdr_T from the free list and allocate the data | |
| 7 | 347 * |
| 1166 | 348 * If the number of pages matches and mf_release() returned a bhdr_T, |
| 7 | 349 * just use the number and free the bhdr_T from the free list |
| 350 */ | |
| 351 if (freep->bh_page_count > page_count) | |
| 352 { | |
| 353 if (hp == NULL && (hp = mf_alloc_bhdr(mfp, page_count)) == NULL) | |
| 354 return NULL; | |
| 355 hp->bh_bnum = freep->bh_bnum; | |
| 356 freep->bh_bnum += page_count; | |
| 357 freep->bh_page_count -= page_count; | |
| 358 } | |
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359 else if (hp == NULL) // need to allocate memory for this block |
| 7 | 360 { |
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361 if ((p = alloc((size_t)mfp->mf_page_size * page_count)) == NULL) |
| 7 | 362 return NULL; |
| 363 hp = mf_rem_free(mfp); | |
| 364 hp->bh_data = p; | |
| 365 } | |
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366 else // use the number, remove entry from free list |
| 7 | 367 { |
| 368 freep = mf_rem_free(mfp); | |
| 369 hp->bh_bnum = freep->bh_bnum; | |
| 370 vim_free(freep); | |
| 371 } | |
| 372 } | |
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373 else // get a new number |
| 7 | 374 { |
| 375 if (hp == NULL && (hp = mf_alloc_bhdr(mfp, page_count)) == NULL) | |
| 376 return NULL; | |
| 377 if (negative) | |
| 378 { | |
| 379 hp->bh_bnum = mfp->mf_blocknr_min--; | |
| 380 mfp->mf_neg_count++; | |
| 381 } | |
| 382 else | |
| 383 { | |
| 384 hp->bh_bnum = mfp->mf_blocknr_max; | |
| 385 mfp->mf_blocknr_max += page_count; | |
| 386 } | |
| 387 } | |
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388 hp->bh_flags = BH_LOCKED | BH_DIRTY; // new block is always dirty |
| 7 | 389 mfp->mf_dirty = TRUE; |
| 390 hp->bh_page_count = page_count; | |
| 391 mf_ins_used(mfp, hp); | |
| 392 mf_ins_hash(mfp, hp); | |
| 393 | |
| 394 /* | |
| 395 * Init the data to all zero, to avoid reading uninitialized data. | |
| 396 * This also avoids that the passwd file ends up in the swap file! | |
| 397 */ | |
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398 (void)vim_memset((char *)(hp->bh_data), 0, |
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399 (size_t)mfp->mf_page_size * page_count); |
| 7 | 400 |
| 401 return hp; | |
| 402 } | |
| 403 | |
| 404 /* | |
| 2267 | 405 * Get existing block "nr" with "page_count" pages. |
| 7 | 406 * |
| 407 * Note: The caller should first check a negative nr with mf_trans_del() | |
| 408 */ | |
| 409 bhdr_T * | |
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410 mf_get(memfile_T *mfp, blocknr_T nr, int page_count) |
| 7 | 411 { |
| 412 bhdr_T *hp; | |
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413 // doesn't exist |
| 7 | 414 if (nr >= mfp->mf_blocknr_max || nr <= mfp->mf_blocknr_min) |
| 415 return NULL; | |
| 416 | |
| 417 /* | |
| 418 * see if it is in the cache | |
| 419 */ | |
| 420 hp = mf_find_hash(mfp, nr); | |
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421 if (hp == NULL) // not in the hash list |
| 7 | 422 { |
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423 if (nr < 0 || nr >= mfp->mf_infile_count) // can't be in the file |
| 7 | 424 return NULL; |
| 425 | |
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426 // could check here if the block is in the free list |
| 7 | 427 |
| 428 /* | |
| 429 * Check if we need to flush an existing block. | |
| 430 * If so, use that block. | |
| 431 * If not, allocate a new block. | |
| 432 */ | |
| 433 hp = mf_release(mfp, page_count); | |
| 434 if (hp == NULL && (hp = mf_alloc_bhdr(mfp, page_count)) == NULL) | |
| 435 return NULL; | |
| 436 | |
| 437 hp->bh_bnum = nr; | |
| 438 hp->bh_flags = 0; | |
| 439 hp->bh_page_count = page_count; | |
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440 if (mf_read(mfp, hp) == FAIL) // cannot read the block! |
| 7 | 441 { |
| 442 mf_free_bhdr(hp); | |
| 443 return NULL; | |
| 444 } | |
| 445 } | |
| 446 else | |
| 447 { | |
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448 mf_rem_used(mfp, hp); // remove from list, insert in front below |
| 7 | 449 mf_rem_hash(mfp, hp); |
| 450 } | |
| 451 | |
| 452 hp->bh_flags |= BH_LOCKED; | |
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453 mf_ins_used(mfp, hp); // put in front of used list |
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454 mf_ins_hash(mfp, hp); // put in front of hash list |
| 7 | 455 |
| 456 return hp; | |
| 457 } | |
| 458 | |
| 459 /* | |
| 460 * release the block *hp | |
| 461 * | |
| 462 * dirty: Block must be written to file later | |
| 463 * infile: Block should be in file (needed for recovery) | |
| 464 * | |
| 465 * no return value, function cannot fail | |
| 466 */ | |
| 467 void | |
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468 mf_put( |
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469 memfile_T *mfp, |
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470 bhdr_T *hp, |
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471 int dirty, |
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472 int infile) |
| 7 | 473 { |
| 474 int flags; | |
| 475 | |
| 476 flags = hp->bh_flags; | |
| 477 | |
| 478 if ((flags & BH_LOCKED) == 0) | |
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479 iemsg(_(e_block_was_not_locked)); |
| 7 | 480 flags &= ~BH_LOCKED; |
| 481 if (dirty) | |
| 482 { | |
| 483 flags |= BH_DIRTY; | |
| 484 mfp->mf_dirty = TRUE; | |
| 485 } | |
| 486 hp->bh_flags = flags; | |
| 487 if (infile) | |
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488 mf_trans_add(mfp, hp); // may translate negative in positive nr |
| 7 | 489 } |
| 490 | |
| 491 /* | |
| 492 * block *hp is no longer in used, may put it in the free list of memfile *mfp | |
| 493 */ | |
| 494 void | |
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495 mf_free(memfile_T *mfp, bhdr_T *hp) |
| 7 | 496 { |
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497 vim_free(hp->bh_data); // free the memory |
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498 mf_rem_hash(mfp, hp); // get *hp out of the hash list |
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499 mf_rem_used(mfp, hp); // get *hp out of the used list |
| 7 | 500 if (hp->bh_bnum < 0) |
| 501 { | |
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502 vim_free(hp); // don't want negative numbers in free list |
| 7 | 503 mfp->mf_neg_count--; |
| 504 } | |
| 505 else | |
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506 mf_ins_free(mfp, hp); // put *hp in the free list |
| 7 | 507 } |
| 508 | |
| 509 /* | |
| 510 * Sync the memory file *mfp to disk. | |
| 511 * Flags: | |
| 512 * MFS_ALL If not given, blocks with negative numbers are not synced, | |
| 513 * even when they are dirty! | |
| 514 * MFS_STOP Stop syncing when a character becomes available, but sync at | |
| 515 * least one block. | |
| 516 * MFS_FLUSH Make sure buffers are flushed to disk, so they will survive a | |
| 517 * system crash. | |
| 518 * MFS_ZERO Only write block 0. | |
| 519 * | |
| 520 * Return FAIL for failure, OK otherwise | |
| 521 */ | |
| 522 int | |
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523 mf_sync(memfile_T *mfp, int flags) |
| 7 | 524 { |
| 525 int status; | |
| 526 bhdr_T *hp; | |
| 527 int got_int_save = got_int; | |
| 528 | |
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529 if (mfp->mf_fd < 0) // there is no file, nothing to do |
| 7 | 530 { |
| 531 mfp->mf_dirty = FALSE; | |
| 532 return FAIL; | |
| 533 } | |
| 534 | |
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535 // Only a CTRL-C while writing will break us here, not one typed |
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536 // previously. |
| 7 | 537 got_int = FALSE; |
| 538 | |
| 539 /* | |
| 540 * sync from last to first (may reduce the probability of an inconsistent | |
| 541 * file) If a write fails, it is very likely caused by a full filesystem. | |
| 542 * Then we only try to write blocks within the existing file. If that also | |
| 543 * fails then we give up. | |
| 544 */ | |
| 545 status = OK; | |
| 546 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev) | |
| 547 if (((flags & MFS_ALL) || hp->bh_bnum >= 0) | |
| 548 && (hp->bh_flags & BH_DIRTY) | |
| 549 && (status == OK || (hp->bh_bnum >= 0 | |
| 550 && hp->bh_bnum < mfp->mf_infile_count))) | |
| 551 { | |
| 552 if ((flags & MFS_ZERO) && hp->bh_bnum != 0) | |
| 553 continue; | |
| 554 if (mf_write(mfp, hp) == FAIL) | |
| 555 { | |
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556 if (status == FAIL) // double error: quit syncing |
| 7 | 557 break; |
| 558 status = FAIL; | |
| 559 } | |
| 560 if (flags & MFS_STOP) | |
| 561 { | |
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562 // Stop when char available now. |
| 7 | 563 if (ui_char_avail()) |
| 564 break; | |
| 565 } | |
| 566 else | |
| 567 ui_breakcheck(); | |
| 568 if (got_int) | |
| 569 break; | |
| 570 } | |
| 571 | |
| 572 /* | |
| 573 * If the whole list is flushed, the memfile is not dirty anymore. | |
| 574 * In case of an error this flag is also set, to avoid trying all the time. | |
| 575 */ | |
| 576 if (hp == NULL || status == FAIL) | |
| 577 mfp->mf_dirty = FALSE; | |
| 578 | |
| 579 if ((flags & MFS_FLUSH) && *p_sws != NUL) | |
| 580 { | |
| 581 #if defined(UNIX) | |
| 582 # ifdef HAVE_FSYNC | |
| 583 /* | |
| 584 * most Unixes have the very useful fsync() function, just what we need. | |
| 585 */ | |
| 586 if (STRCMP(p_sws, "fsync") == 0) | |
| 587 { | |
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588 if (vim_fsync(mfp->mf_fd)) |
| 7 | 589 status = FAIL; |
| 590 } | |
| 591 else | |
| 592 # endif | |
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593 // OpenNT is strictly POSIX (Benzinger) |
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594 // Tandem/Himalaya NSK-OSS doesn't have sync() |
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595 // No sync() on Stratus VOS |
| 6637 | 596 # if defined(__OPENNT) || defined(__TANDEM) || defined(__VOS__) |
| 7 | 597 fflush(NULL); |
| 598 # else | |
| 599 sync(); | |
| 600 # endif | |
| 601 #endif | |
| 602 #ifdef VMS | |
| 603 if (STRCMP(p_sws, "fsync") == 0) | |
| 604 { | |
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605 if (vim_fsync(mfp->mf_fd)) |
| 7 | 606 status = FAIL; |
| 607 } | |
| 608 #endif | |
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609 #ifdef MSWIN |
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610 if (_commit(mfp->mf_fd)) |
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611 status = FAIL; |
| 7 | 612 #endif |
| 613 #ifdef AMIGA | |
| 1030 | 614 # if defined(__AROS__) || defined(__amigaos4__) |
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615 if (vim_fsync(mfp->mf_fd) != 0) |
| 7 | 616 status = FAIL; |
| 617 # else | |
| 618 /* | |
| 619 * Flush() only exists for AmigaDos 2.0. | |
| 620 * For 1.3 it should be done with close() + open(), but then the risk | |
| 621 * is that the open() may fail and lose the file.... | |
| 622 */ | |
| 623 # ifdef FEAT_ARP | |
| 624 if (dos2) | |
| 625 # endif | |
| 626 # ifdef SASC | |
| 627 { | |
| 628 struct UFB *fp = chkufb(mfp->mf_fd); | |
| 629 | |
| 630 if (fp != NULL) | |
| 631 Flush(fp->ufbfh); | |
| 632 } | |
| 633 # else | |
| 634 # if defined(_DCC) || defined(__GNUC__) || defined(__MORPHOS__) | |
| 635 { | |
| 984 | 636 # if defined(__GNUC__) && !defined(__MORPHOS__) && defined(__libnix__) |
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637 // Have function (in libnix at least), |
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638 // but ain't got no prototype anywhere. |
| 7 | 639 extern unsigned long fdtofh(int filedescriptor); |
| 640 # endif | |
| 984 | 641 # if !defined(__libnix__) |
| 642 fflush(NULL); | |
| 643 # else | |
| 7 | 644 BPTR fh = (BPTR)fdtofh(mfp->mf_fd); |
| 645 | |
| 646 if (fh != 0) | |
| 647 Flush(fh); | |
| 984 | 648 # endif |
| 7 | 649 } |
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650 # else // assume Manx |
| 7 | 651 Flush(_devtab[mfp->mf_fd].fd); |
| 652 # endif | |
| 653 # endif | |
| 654 # endif | |
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655 #endif // AMIGA |
| 7 | 656 } |
| 657 | |
| 658 got_int |= got_int_save; | |
| 659 | |
| 660 return status; | |
| 661 } | |
| 662 | |
| 663 /* | |
| 630 | 664 * For all blocks in memory file *mfp that have a positive block number set |
| 665 * the dirty flag. These are blocks that need to be written to a newly | |
| 666 * created swapfile. | |
| 667 */ | |
| 668 void | |
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669 mf_set_dirty(memfile_T *mfp) |
| 630 | 670 { |
| 671 bhdr_T *hp; | |
| 672 | |
| 673 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev) | |
| 674 if (hp->bh_bnum > 0) | |
| 675 hp->bh_flags |= BH_DIRTY; | |
| 676 mfp->mf_dirty = TRUE; | |
| 677 } | |
| 678 | |
| 679 /* | |
| 7 | 680 * insert block *hp in front of hashlist of memfile *mfp |
| 681 */ | |
| 682 static void | |
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683 mf_ins_hash(memfile_T *mfp, bhdr_T *hp) |
| 7 | 684 { |
| 2730 | 685 mf_hash_add_item(&mfp->mf_hash, (mf_hashitem_T *)hp); |
| 7 | 686 } |
| 687 | |
| 688 /* | |
| 689 * remove block *hp from hashlist of memfile list *mfp | |
| 690 */ | |
| 691 static void | |
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692 mf_rem_hash(memfile_T *mfp, bhdr_T *hp) |
| 7 | 693 { |
| 2730 | 694 mf_hash_rem_item(&mfp->mf_hash, (mf_hashitem_T *)hp); |
| 7 | 695 } |
| 696 | |
| 697 /* | |
| 698 * look in hash lists of memfile *mfp for block header with number 'nr' | |
| 699 */ | |
| 700 static bhdr_T * | |
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701 mf_find_hash(memfile_T *mfp, blocknr_T nr) |
| 7 | 702 { |
| 2730 | 703 return (bhdr_T *)mf_hash_find(&mfp->mf_hash, nr); |
| 7 | 704 } |
| 705 | |
| 706 /* | |
| 707 * insert block *hp in front of used list of memfile *mfp | |
| 708 */ | |
| 709 static void | |
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710 mf_ins_used(memfile_T *mfp, bhdr_T *hp) |
| 7 | 711 { |
| 712 hp->bh_next = mfp->mf_used_first; | |
| 713 mfp->mf_used_first = hp; | |
| 714 hp->bh_prev = NULL; | |
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715 if (hp->bh_next == NULL) // list was empty, adjust last pointer |
| 7 | 716 mfp->mf_used_last = hp; |
| 717 else | |
| 718 hp->bh_next->bh_prev = hp; | |
| 719 mfp->mf_used_count += hp->bh_page_count; | |
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720 total_mem_used += (long_u)hp->bh_page_count * mfp->mf_page_size; |
| 7 | 721 } |
| 722 | |
| 723 /* | |
| 724 * remove block *hp from used list of memfile *mfp | |
| 725 */ | |
| 726 static void | |
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727 mf_rem_used(memfile_T *mfp, bhdr_T *hp) |
| 7 | 728 { |
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729 if (hp->bh_next == NULL) // last block in used list |
| 7 | 730 mfp->mf_used_last = hp->bh_prev; |
| 731 else | |
| 732 hp->bh_next->bh_prev = hp->bh_prev; | |
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733 if (hp->bh_prev == NULL) // first block in used list |
| 7 | 734 mfp->mf_used_first = hp->bh_next; |
| 735 else | |
| 736 hp->bh_prev->bh_next = hp->bh_next; | |
| 737 mfp->mf_used_count -= hp->bh_page_count; | |
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738 total_mem_used -= (long_u)hp->bh_page_count * mfp->mf_page_size; |
| 7 | 739 } |
| 740 | |
| 741 /* | |
| 742 * Release the least recently used block from the used list if the number | |
| 743 * of used memory blocks gets to big. | |
| 744 * | |
| 745 * Return the block header to the caller, including the memory block, so | |
| 746 * it can be re-used. Make sure the page_count is right. | |
| 6817 | 747 * |
| 748 * Returns NULL if no block is released. | |
| 7 | 749 */ |
| 750 static bhdr_T * | |
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751 mf_release(memfile_T *mfp, int page_count) |
| 7 | 752 { |
| 753 bhdr_T *hp; | |
| 754 int need_release; | |
| 755 buf_T *buf; | |
| 756 | |
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757 // don't release while in mf_close_file() |
| 1066 | 758 if (mf_dont_release) |
| 7 | 759 return NULL; |
| 760 | |
| 761 /* | |
| 762 * Need to release a block if the number of blocks for this memfile is | |
| 763 * higher than the maximum or total memory used is over 'maxmemtot' | |
| 764 */ | |
| 765 need_release = ((mfp->mf_used_count >= mfp->mf_used_count_max) | |
| 766 || (total_mem_used >> 10) >= (long_u)p_mmt); | |
| 767 | |
| 768 /* | |
| 769 * Try to create a swap file if the amount of memory used is getting too | |
| 770 * high. | |
| 771 */ | |
| 772 if (mfp->mf_fd < 0 && need_release && p_uc) | |
| 773 { | |
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774 // find for which buffer this memfile is |
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775 FOR_ALL_BUFFERS(buf) |
| 7 | 776 if (buf->b_ml.ml_mfp == mfp) |
| 777 break; | |
| 778 if (buf != NULL && buf->b_may_swap) | |
| 779 ml_open_file(buf); | |
| 780 } | |
| 781 | |
| 782 /* | |
| 783 * don't release a block if | |
| 784 * there is no file for this memfile | |
| 785 * or | |
| 786 * the number of blocks for this memfile is lower than the maximum | |
| 787 * and | |
| 788 * total memory used is not up to 'maxmemtot' | |
| 789 */ | |
| 790 if (mfp->mf_fd < 0 || !need_release) | |
| 791 return NULL; | |
| 792 | |
| 793 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev) | |
| 794 if (!(hp->bh_flags & BH_LOCKED)) | |
| 795 break; | |
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796 if (hp == NULL) // not a single one that can be released |
| 7 | 797 return NULL; |
| 798 | |
| 799 /* | |
| 800 * If the block is dirty, write it. | |
| 801 * If the write fails we don't free it. | |
| 802 */ | |
| 803 if ((hp->bh_flags & BH_DIRTY) && mf_write(mfp, hp) == FAIL) | |
| 804 return NULL; | |
| 805 | |
| 806 mf_rem_used(mfp, hp); | |
| 807 mf_rem_hash(mfp, hp); | |
| 808 | |
| 809 /* | |
| 810 * If a bhdr_T is returned, make sure that the page_count of bh_data is | |
| 811 * right | |
| 812 */ | |
| 813 if (hp->bh_page_count != page_count) | |
| 814 { | |
| 815 vim_free(hp->bh_data); | |
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816 if ((hp->bh_data = alloc((size_t)mfp->mf_page_size * page_count)) |
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|
817 == NULL) |
| 7 | 818 { |
| 819 vim_free(hp); | |
| 820 return NULL; | |
| 821 } | |
| 822 hp->bh_page_count = page_count; | |
| 823 } | |
| 824 return hp; | |
| 825 } | |
| 826 | |
| 827 /* | |
| 828 * release as many blocks as possible | |
| 829 * Used in case of out of memory | |
| 830 * | |
| 831 * return TRUE if any memory was released | |
| 832 */ | |
| 833 int | |
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834 mf_release_all(void) |
| 7 | 835 { |
| 836 buf_T *buf; | |
| 837 memfile_T *mfp; | |
| 838 bhdr_T *hp; | |
| 839 int retval = FALSE; | |
| 840 | |
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841 FOR_ALL_BUFFERS(buf) |
| 7 | 842 { |
| 843 mfp = buf->b_ml.ml_mfp; | |
| 844 if (mfp != NULL) | |
| 845 { | |
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846 // If no swap file yet, may open one |
| 7 | 847 if (mfp->mf_fd < 0 && buf->b_may_swap) |
| 848 ml_open_file(buf); | |
| 849 | |
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850 // only if there is a swapfile |
| 7 | 851 if (mfp->mf_fd >= 0) |
| 852 { | |
| 853 for (hp = mfp->mf_used_last; hp != NULL; ) | |
| 854 { | |
| 855 if (!(hp->bh_flags & BH_LOCKED) | |
| 856 && (!(hp->bh_flags & BH_DIRTY) | |
| 857 || mf_write(mfp, hp) != FAIL)) | |
| 858 { | |
| 859 mf_rem_used(mfp, hp); | |
| 860 mf_rem_hash(mfp, hp); | |
| 861 mf_free_bhdr(hp); | |
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862 hp = mfp->mf_used_last; // re-start, list was changed |
| 7 | 863 retval = TRUE; |
| 864 } | |
| 865 else | |
| 866 hp = hp->bh_prev; | |
| 867 } | |
| 868 } | |
| 869 } | |
| 870 } | |
| 871 return retval; | |
| 872 } | |
| 873 | |
| 874 /* | |
| 875 * Allocate a block header and a block of memory for it | |
| 876 */ | |
| 877 static bhdr_T * | |
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878 mf_alloc_bhdr(memfile_T *mfp, int page_count) |
| 7 | 879 { |
| 880 bhdr_T *hp; | |
| 881 | |
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882 if ((hp = ALLOC_ONE(bhdr_T)) != NULL) |
| 7 | 883 { |
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884 if ((hp->bh_data = alloc((size_t)mfp->mf_page_size * page_count)) |
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885 == NULL) |
| 7 | 886 { |
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887 vim_free(hp); // not enough memory |
| 7 | 888 return NULL; |
| 889 } | |
| 890 hp->bh_page_count = page_count; | |
| 891 } | |
| 892 return hp; | |
| 893 } | |
| 894 | |
| 895 /* | |
| 896 * Free a block header and the block of memory for it | |
| 897 */ | |
| 898 static void | |
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899 mf_free_bhdr(bhdr_T *hp) |
| 7 | 900 { |
| 901 vim_free(hp->bh_data); | |
| 902 vim_free(hp); | |
| 903 } | |
| 904 | |
| 905 /* | |
| 906 * insert entry *hp in the free list | |
| 907 */ | |
| 908 static void | |
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909 mf_ins_free(memfile_T *mfp, bhdr_T *hp) |
| 7 | 910 { |
| 911 hp->bh_next = mfp->mf_free_first; | |
| 912 mfp->mf_free_first = hp; | |
| 913 } | |
| 914 | |
| 915 /* | |
| 916 * remove the first entry from the free list and return a pointer to it | |
| 917 * Note: caller must check that mfp->mf_free_first is not NULL! | |
| 918 */ | |
| 919 static bhdr_T * | |
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920 mf_rem_free(memfile_T *mfp) |
| 7 | 921 { |
| 922 bhdr_T *hp; | |
| 923 | |
| 924 hp = mfp->mf_free_first; | |
| 925 mfp->mf_free_first = hp->bh_next; | |
| 926 return hp; | |
| 927 } | |
| 928 | |
| 929 /* | |
| 930 * read a block from disk | |
| 931 * | |
| 932 * Return FAIL for failure, OK otherwise | |
| 933 */ | |
| 934 static int | |
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935 mf_read(memfile_T *mfp, bhdr_T *hp) |
| 7 | 936 { |
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937 off_T offset; |
| 7 | 938 unsigned page_size; |
| 939 unsigned size; | |
| 940 | |
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941 if (mfp->mf_fd < 0) // there is no file, can't read |
| 7 | 942 return FAIL; |
| 943 | |
| 944 page_size = mfp->mf_page_size; | |
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945 offset = (off_T)page_size * hp->bh_bnum; |
| 7 | 946 size = page_size * hp->bh_page_count; |
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947 if (vim_lseek(mfp->mf_fd, offset, SEEK_SET) != offset) |
| 7 | 948 { |
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949 PERROR(_(e_seek_error_in_swap_file_read)); |
| 7 | 950 return FAIL; |
| 951 } | |
| 2664 | 952 if ((unsigned)read_eintr(mfp->mf_fd, hp->bh_data, size) != size) |
| 7 | 953 { |
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954 PERROR(_(e_read_error_in_swap_file)); |
| 7 | 955 return FAIL; |
| 956 } | |
| 2267 | 957 |
| 958 #ifdef FEAT_CRYPT | |
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959 // Decrypt if 'key' is set and this is a data block. And when changing the |
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960 // key. |
|
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961 if (*mfp->mf_buffer->b_p_key != NUL || mfp->mf_old_key != NULL) |
| 2267 | 962 ml_decrypt_data(mfp, hp->bh_data, offset, size); |
| 963 #endif | |
| 964 | |
| 7 | 965 return OK; |
| 966 } | |
| 967 | |
| 968 /* | |
| 969 * write a block to disk | |
| 970 * | |
| 971 * Return FAIL for failure, OK otherwise | |
| 972 */ | |
| 973 static int | |
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974 mf_write(memfile_T *mfp, bhdr_T *hp) |
| 7 | 975 { |
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976 off_T offset; // offset in the file |
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977 blocknr_T nr; // block nr which is being written |
| 7 | 978 bhdr_T *hp2; |
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979 unsigned page_size; // number of bytes in a page |
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980 unsigned page_count; // number of pages written |
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981 unsigned size; // number of bytes written |
| 7 | 982 |
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983 if (mfp->mf_fd < 0 && !mfp->mf_reopen) |
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984 // there is no file and there was no file, can't write |
| 7 | 985 return FAIL; |
| 986 | |
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987 if (hp->bh_bnum < 0) // must assign file block number |
| 7 | 988 if (mf_trans_add(mfp, hp) == FAIL) |
| 989 return FAIL; | |
| 990 | |
| 991 page_size = mfp->mf_page_size; | |
| 992 | |
| 993 /* | |
| 994 * We don't want gaps in the file. Write the blocks in front of *hp | |
| 995 * to extend the file. | |
| 996 * If block 'mf_infile_count' is not in the hash list, it has been | |
| 997 * freed. Fill the space in the file with data from the current block. | |
| 998 */ | |
| 999 for (;;) | |
| 1000 { | |
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1001 int attempt; |
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1002 |
| 7 | 1003 nr = hp->bh_bnum; |
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1004 if (nr > mfp->mf_infile_count) // beyond end of file |
| 7 | 1005 { |
| 1006 nr = mfp->mf_infile_count; | |
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1007 hp2 = mf_find_hash(mfp, nr); // NULL caught below |
| 7 | 1008 } |
| 1009 else | |
| 1010 hp2 = hp; | |
| 1011 | |
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1012 offset = (off_T)page_size * nr; |
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1013 if (hp2 == NULL) // freed block, fill with dummy data |
| 7 | 1014 page_count = 1; |
| 1015 else | |
| 1016 page_count = hp2->bh_page_count; | |
| 1017 size = page_size * page_count; | |
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1018 |
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1019 for (attempt = 1; attempt <= 2; ++attempt) |
| 7 | 1020 { |
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1021 if (mfp->mf_fd >= 0) |
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1022 { |
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1023 if (vim_lseek(mfp->mf_fd, offset, SEEK_SET) != offset) |
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1024 { |
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1025 PERROR(_(e_seek_error_in_swap_file_write)); |
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1026 return FAIL; |
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1027 } |
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1028 if (mf_write_block(mfp, |
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1029 hp2 == NULL ? hp : hp2, offset, size) == OK) |
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1030 break; |
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1031 } |
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1032 |
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1033 if (attempt == 1) |
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1034 { |
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1035 // If the swap file is on a network drive, and the network |
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1036 // gets disconnected and then re-connected, we can maybe fix it |
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1037 // by closing and then re-opening the file. |
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1038 if (mfp->mf_fd >= 0) |
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1039 close(mfp->mf_fd); |
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1040 mfp->mf_fd = mch_open_rw((char *)mfp->mf_fname, mfp->mf_flags); |
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1041 mfp->mf_reopen = (mfp->mf_fd < 0); |
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1042 } |
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1043 if (attempt == 2 || mfp->mf_fd < 0) |
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1044 { |
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1045 // Avoid repeating the error message, this mostly happens when |
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1046 // the disk is full. We give the message again only after a |
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1047 // successful write or when hitting a key. We keep on trying, |
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1048 // in case some space becomes available. |
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1049 if (!did_swapwrite_msg) |
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1050 emsg(_(e_write_error_in_swap_file)); |
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1051 did_swapwrite_msg = TRUE; |
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1052 return FAIL; |
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1053 } |
| 7 | 1054 } |
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1055 |
| 7 | 1056 did_swapwrite_msg = FALSE; |
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1057 if (hp2 != NULL) // written a non-dummy block |
| 7 | 1058 hp2->bh_flags &= ~BH_DIRTY; |
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1059 // appended to the file |
| 7 | 1060 if (nr + (blocknr_T)page_count > mfp->mf_infile_count) |
| 1061 mfp->mf_infile_count = nr + page_count; | |
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1062 if (nr == hp->bh_bnum) // written the desired block |
| 7 | 1063 break; |
| 1064 } | |
| 1065 return OK; | |
| 1066 } | |
| 1067 | |
| 1068 /* | |
| 2267 | 1069 * Write block "hp" with data size "size" to file "mfp->mf_fd". |
| 1070 * Takes care of encryption. | |
| 1071 * Return FAIL or OK. | |
| 1072 */ | |
| 1073 static int | |
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1074 mf_write_block( |
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1075 memfile_T *mfp, |
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1076 bhdr_T *hp, |
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1077 off_T offset UNUSED, |
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1078 unsigned size) |
| 2267 | 1079 { |
| 1080 char_u *data = hp->bh_data; | |
| 1081 int result = OK; | |
| 1082 | |
| 1083 #ifdef FEAT_CRYPT | |
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1084 // Encrypt if 'key' is set and this is a data block. |
| 2267 | 1085 if (*mfp->mf_buffer->b_p_key != NUL) |
| 1086 { | |
| 1087 data = ml_encrypt_data(mfp, data, offset, size); | |
| 1088 if (data == NULL) | |
| 1089 return FAIL; | |
| 1090 } | |
| 1091 #endif | |
| 1092 | |
| 2664 | 1093 if ((unsigned)write_eintr(mfp->mf_fd, data, size) != size) |
| 2267 | 1094 result = FAIL; |
| 1095 | |
| 1096 #ifdef FEAT_CRYPT | |
| 1097 if (data != hp->bh_data) | |
| 1098 vim_free(data); | |
| 1099 #endif | |
| 1100 | |
| 1101 return result; | |
| 1102 } | |
| 1103 | |
| 1104 /* | |
| 7 | 1105 * Make block number for *hp positive and add it to the translation list |
| 1106 * | |
| 1107 * Return FAIL for failure, OK otherwise | |
| 1108 */ | |
| 1109 static int | |
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1110 mf_trans_add(memfile_T *mfp, bhdr_T *hp) |
| 7 | 1111 { |
| 1112 bhdr_T *freep; | |
| 1113 blocknr_T new_bnum; | |
| 1114 NR_TRANS *np; | |
| 1115 int page_count; | |
| 1116 | |
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1117 if (hp->bh_bnum >= 0) // it's already positive |
| 7 | 1118 return OK; |
| 1119 | |
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1120 if ((np = ALLOC_ONE(NR_TRANS)) == NULL) |
| 7 | 1121 return FAIL; |
| 1122 | |
| 1123 /* | |
| 2267 | 1124 * Get a new number for the block. |
| 7 | 1125 * If the first item in the free list has sufficient pages, use its number |
| 1126 * Otherwise use mf_blocknr_max. | |
| 1127 */ | |
| 1128 freep = mfp->mf_free_first; | |
| 1129 page_count = hp->bh_page_count; | |
| 1130 if (freep != NULL && freep->bh_page_count >= page_count) | |
| 1131 { | |
| 1132 new_bnum = freep->bh_bnum; | |
| 1133 /* | |
| 4352 | 1134 * If the page count of the free block was larger, reduce it. |
| 7 | 1135 * If the page count matches, remove the block from the free list |
| 1136 */ | |
| 1137 if (freep->bh_page_count > page_count) | |
| 1138 { | |
| 1139 freep->bh_bnum += page_count; | |
| 1140 freep->bh_page_count -= page_count; | |
| 1141 } | |
| 1142 else | |
| 1143 { | |
| 1144 freep = mf_rem_free(mfp); | |
| 1145 vim_free(freep); | |
| 1146 } | |
| 1147 } | |
| 1148 else | |
| 1149 { | |
| 1150 new_bnum = mfp->mf_blocknr_max; | |
| 1151 mfp->mf_blocknr_max += page_count; | |
| 1152 } | |
| 1153 | |
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1154 np->nt_old_bnum = hp->bh_bnum; // adjust number |
| 7 | 1155 np->nt_new_bnum = new_bnum; |
| 1156 | |
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1157 mf_rem_hash(mfp, hp); // remove from old hash list |
| 7 | 1158 hp->bh_bnum = new_bnum; |
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1159 mf_ins_hash(mfp, hp); // insert in new hash list |
| 7 | 1160 |
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|
1161 // Insert "np" into "mf_trans" hashtable with key "np->nt_old_bnum" |
| 2730 | 1162 mf_hash_add_item(&mfp->mf_trans, (mf_hashitem_T *)np); |
| 7 | 1163 |
| 1164 return OK; | |
| 1165 } | |
| 1166 | |
| 1167 /* | |
| 6817 | 1168 * Lookup a translation from the trans lists and delete the entry. |
| 7 | 1169 * |
| 1170 * Return the positive new number when found, the old number when not found | |
| 1171 */ | |
| 1172 blocknr_T | |
|
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1173 mf_trans_del(memfile_T *mfp, blocknr_T old_nr) |
| 7 | 1174 { |
| 1175 NR_TRANS *np; | |
| 1176 blocknr_T new_bnum; | |
| 1177 | |
| 2730 | 1178 np = (NR_TRANS *)mf_hash_find(&mfp->mf_trans, old_nr); |
| 1179 | |
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1180 if (np == NULL) // not found |
| 7 | 1181 return old_nr; |
| 1182 | |
| 1183 mfp->mf_neg_count--; | |
| 1184 new_bnum = np->nt_new_bnum; | |
| 2730 | 1185 |
|
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1186 // remove entry from the trans list |
| 2730 | 1187 mf_hash_rem_item(&mfp->mf_trans, (mf_hashitem_T *)np); |
| 1188 | |
| 7 | 1189 vim_free(np); |
| 1190 | |
| 1191 return new_bnum; | |
| 1192 } | |
| 1193 | |
| 1194 /* | |
| 1195 * Set mfp->mf_ffname according to mfp->mf_fname and some other things. | |
| 1196 * Only called when creating or renaming the swapfile. Either way it's a new | |
| 1197 * name so we must work out the full path name. | |
| 1198 */ | |
| 1199 void | |
|
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1200 mf_set_ffname(memfile_T *mfp) |
| 7 | 1201 { |
| 1202 mfp->mf_ffname = FullName_save(mfp->mf_fname, FALSE); | |
| 1203 } | |
| 1204 | |
| 1205 /* | |
| 1206 * Make the name of the file used for the memfile a full path. | |
| 1207 * Used before doing a :cd | |
| 1208 */ | |
| 1209 void | |
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1210 mf_fullname(memfile_T *mfp) |
| 7 | 1211 { |
| 1212 if (mfp != NULL && mfp->mf_fname != NULL && mfp->mf_ffname != NULL) | |
| 1213 { | |
| 1214 vim_free(mfp->mf_fname); | |
| 1215 mfp->mf_fname = mfp->mf_ffname; | |
| 1216 mfp->mf_ffname = NULL; | |
| 1217 } | |
| 1218 } | |
| 1219 | |
| 1220 /* | |
| 1221 * return TRUE if there are any translations pending for 'mfp' | |
| 1222 */ | |
| 1223 int | |
|
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1224 mf_need_trans(memfile_T *mfp) |
| 7 | 1225 { |
| 1226 return (mfp->mf_fname != NULL && mfp->mf_neg_count > 0); | |
| 1227 } | |
| 1228 | |
| 1229 /* | |
| 1230 * Open a swap file for a memfile. | |
| 1231 * The "fname" must be in allocated memory, and is consumed (also when an | |
| 1232 * error occurs). | |
| 1233 */ | |
| 1234 static void | |
|
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1235 mf_do_open( |
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1236 memfile_T *mfp, |
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1237 char_u *fname, |
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1238 int flags) // flags for open() |
| 7 | 1239 { |
| 1240 #ifdef HAVE_LSTAT | |
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1241 stat_T sb; |
| 7 | 1242 #endif |
| 1243 | |
| 1244 mfp->mf_fname = fname; | |
| 1245 | |
| 1246 /* | |
| 1247 * Get the full path name before the open, because this is | |
| 1248 * not possible after the open on the Amiga. | |
| 1249 * fname cannot be NameBuff, because it must have been allocated. | |
| 1250 */ | |
| 1251 mf_set_ffname(mfp); | |
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1252 #if defined(MSWIN) |
| 7 | 1253 /* |
| 4352 | 1254 * A ":!cd e:xxx" may change the directory without us knowing, use the |
| 7 | 1255 * full pathname always. Careful: This frees fname! |
| 1256 */ | |
| 1257 mf_fullname(mfp); | |
| 1258 #endif | |
| 1259 | |
| 1260 #ifdef HAVE_LSTAT | |
| 1261 /* | |
| 1262 * Extra security check: When creating a swap file it really shouldn't | |
| 1263 * exist yet. If there is a symbolic link, this is most likely an attack. | |
| 1264 */ | |
| 1265 if ((flags & O_CREAT) && mch_lstat((char *)mfp->mf_fname, &sb) >= 0) | |
| 1266 { | |
| 1267 mfp->mf_fd = -1; | |
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1268 emsg(_(e_swap_file_already_exists_symlink_attack)); |
| 7 | 1269 } |
| 1270 else | |
| 1271 #endif | |
| 1272 { | |
| 1273 /* | |
| 1274 * try to open the file | |
| 1275 */ | |
| 557 | 1276 flags |= O_EXTRA | O_NOFOLLOW; |
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1277 #ifdef MSWIN |
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1278 // Prevent handle inheritance that cause problems with Cscope |
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1279 // (swap file may not be deleted if cscope connection was open after |
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1280 // the file) |
| 7 | 1281 flags |= O_NOINHERIT; |
| 1282 #endif | |
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1283 mfp->mf_flags = flags; |
| 7 | 1284 mfp->mf_fd = mch_open_rw((char *)mfp->mf_fname, flags); |
| 1285 } | |
| 1286 | |
| 1287 /* | |
| 1288 * If the file cannot be opened, use memory only | |
| 1289 */ | |
| 1290 if (mfp->mf_fd < 0) | |
| 1291 { | |
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1292 VIM_CLEAR(mfp->mf_fname); |
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1293 VIM_CLEAR(mfp->mf_ffname); |
| 7 | 1294 } |
| 1295 else | |
| 1583 | 1296 { |
| 2003 | 1297 #ifdef HAVE_FD_CLOEXEC |
| 1298 int fdflags = fcntl(mfp->mf_fd, F_GETFD); | |
| 1299 if (fdflags >= 0 && (fdflags & FD_CLOEXEC) == 0) | |
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1300 (void)fcntl(mfp->mf_fd, F_SETFD, fdflags | FD_CLOEXEC); |
| 2003 | 1301 #endif |
| 5788 | 1302 #if defined(HAVE_SELINUX) || defined(HAVE_SMACK) |
| 1583 | 1303 mch_copy_sec(fname, mfp->mf_fname); |
| 1304 #endif | |
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1305 mch_hide(mfp->mf_fname); // try setting the 'hidden' flag |
| 1583 | 1306 } |
| 7 | 1307 } |
| 2730 | 1308 |
| 1309 /* | |
| 1310 * Implementation of mf_hashtab_T follows. | |
| 1311 */ | |
| 1312 | |
| 1313 /* | |
| 1314 * The number of buckets in the hashtable is increased by a factor of | |
| 1315 * MHT_GROWTH_FACTOR when the average number of items per bucket | |
| 1316 * exceeds 2 ^ MHT_LOG_LOAD_FACTOR. | |
| 1317 */ | |
| 1318 #define MHT_LOG_LOAD_FACTOR 6 | |
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1319 #define MHT_GROWTH_FACTOR 2 // must be a power of two |
| 2730 | 1320 |
| 1321 /* | |
| 1322 * Initialize an empty hash table. | |
| 1323 */ | |
| 1324 static void | |
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1325 mf_hash_init(mf_hashtab_T *mht) |
| 2730 | 1326 { |
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1327 CLEAR_POINTER(mht); |
| 2730 | 1328 mht->mht_buckets = mht->mht_small_buckets; |
| 1329 mht->mht_mask = MHT_INIT_SIZE - 1; | |
| 1330 } | |
| 1331 | |
| 1332 /* | |
| 1333 * Free the array of a hash table. Does not free the items it contains! | |
| 1334 * The hash table must not be used again without another mf_hash_init() call. | |
| 1335 */ | |
| 1336 static void | |
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1337 mf_hash_free(mf_hashtab_T *mht) |
| 2730 | 1338 { |
| 1339 if (mht->mht_buckets != mht->mht_small_buckets) | |
| 1340 vim_free(mht->mht_buckets); | |
| 1341 } | |
| 1342 | |
| 1343 /* | |
| 1344 * Free the array of a hash table and all the items it contains. | |
| 1345 */ | |
| 1346 static void | |
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1347 mf_hash_free_all(mf_hashtab_T *mht) |
| 2730 | 1348 { |
| 1349 long_u idx; | |
| 1350 mf_hashitem_T *mhi; | |
| 1351 mf_hashitem_T *next; | |
| 1352 | |
| 1353 for (idx = 0; idx <= mht->mht_mask; idx++) | |
| 1354 for (mhi = mht->mht_buckets[idx]; mhi != NULL; mhi = next) | |
| 1355 { | |
| 1356 next = mhi->mhi_next; | |
| 1357 vim_free(mhi); | |
| 1358 } | |
| 1359 | |
| 1360 mf_hash_free(mht); | |
| 1361 } | |
| 1362 | |
| 1363 /* | |
| 1364 * Find "key" in hashtable "mht". | |
| 1365 * Returns a pointer to a mf_hashitem_T or NULL if the item was not found. | |
| 1366 */ | |
| 1367 static mf_hashitem_T * | |
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1368 mf_hash_find(mf_hashtab_T *mht, blocknr_T key) |
| 2730 | 1369 { |
| 1370 mf_hashitem_T *mhi; | |
| 1371 | |
| 1372 mhi = mht->mht_buckets[key & mht->mht_mask]; | |
| 1373 while (mhi != NULL && mhi->mhi_key != key) | |
| 1374 mhi = mhi->mhi_next; | |
| 1375 | |
| 1376 return mhi; | |
| 1377 } | |
| 1378 | |
| 1379 /* | |
| 1380 * Add item "mhi" to hashtable "mht". | |
| 1381 * "mhi" must not be NULL. | |
| 1382 */ | |
| 1383 static void | |
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1384 mf_hash_add_item(mf_hashtab_T *mht, mf_hashitem_T *mhi) |
| 2730 | 1385 { |
| 1386 long_u idx; | |
| 1387 | |
| 1388 idx = mhi->mhi_key & mht->mht_mask; | |
| 1389 mhi->mhi_next = mht->mht_buckets[idx]; | |
| 1390 mhi->mhi_prev = NULL; | |
| 1391 if (mhi->mhi_next != NULL) | |
| 1392 mhi->mhi_next->mhi_prev = mhi; | |
| 1393 mht->mht_buckets[idx] = mhi; | |
| 1394 | |
| 1395 mht->mht_count++; | |
| 1396 | |
| 1397 /* | |
| 1398 * Grow hashtable when we have more thank 2^MHT_LOG_LOAD_FACTOR | |
| 1399 * items per bucket on average | |
| 1400 */ | |
| 1401 if (mht->mht_fixed == 0 | |
| 1402 && (mht->mht_count >> MHT_LOG_LOAD_FACTOR) > mht->mht_mask) | |
| 1403 { | |
| 1404 if (mf_hash_grow(mht) == FAIL) | |
| 1405 { | |
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1406 // stop trying to grow after first failure to allocate memory |
| 2730 | 1407 mht->mht_fixed = 1; |
| 1408 } | |
| 1409 } | |
| 1410 } | |
| 1411 | |
| 1412 /* | |
| 1413 * Remove item "mhi" from hashtable "mht". | |
| 1414 * "mhi" must not be NULL and must have been inserted into "mht". | |
| 1415 */ | |
| 1416 static void | |
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1417 mf_hash_rem_item(mf_hashtab_T *mht, mf_hashitem_T *mhi) |
| 2730 | 1418 { |
| 1419 if (mhi->mhi_prev == NULL) | |
| 1420 mht->mht_buckets[mhi->mhi_key & mht->mht_mask] = mhi->mhi_next; | |
| 1421 else | |
| 1422 mhi->mhi_prev->mhi_next = mhi->mhi_next; | |
| 1423 | |
| 1424 if (mhi->mhi_next != NULL) | |
| 1425 mhi->mhi_next->mhi_prev = mhi->mhi_prev; | |
| 1426 | |
| 1427 mht->mht_count--; | |
| 1428 | |
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1429 // We could shrink the table here, but it typically takes little memory, |
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1430 // so why bother? |
| 2730 | 1431 } |
| 1432 | |
| 1433 /* | |
| 1434 * Increase number of buckets in the hashtable by MHT_GROWTH_FACTOR and | |
| 1435 * rehash items. | |
| 1436 * Returns FAIL when out of memory. | |
| 1437 */ | |
| 1438 static int | |
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1439 mf_hash_grow(mf_hashtab_T *mht) |
| 2730 | 1440 { |
| 1441 long_u i, j; | |
| 1442 int shift; | |
| 1443 mf_hashitem_T *mhi; | |
| 1444 mf_hashitem_T *tails[MHT_GROWTH_FACTOR]; | |
| 1445 mf_hashitem_T **buckets; | |
| 1446 size_t size; | |
| 1447 | |
| 1448 size = (mht->mht_mask + 1) * MHT_GROWTH_FACTOR * sizeof(void *); | |
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1449 buckets = lalloc_clear(size, FALSE); |
| 2730 | 1450 if (buckets == NULL) |
| 1451 return FAIL; | |
| 1452 | |
| 1453 shift = 0; | |
| 1454 while ((mht->mht_mask >> shift) != 0) | |
| 1455 shift++; | |
| 1456 | |
| 1457 for (i = 0; i <= mht->mht_mask; i++) | |
| 1458 { | |
| 1459 /* | |
| 1460 * Traverse the items in the i-th original bucket and move them into | |
| 1461 * MHT_GROWTH_FACTOR new buckets, preserving their relative order | |
| 1462 * within each new bucket. Preserving the order is important because | |
| 1463 * mf_get() tries to keep most recently used items at the front of | |
| 1464 * each bucket. | |
| 1465 * | |
| 1466 * Here we strongly rely on the fact the hashes are computed modulo | |
| 1467 * a power of two. | |
| 1468 */ | |
| 1469 | |
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1470 CLEAR_FIELD(tails); |
| 2730 | 1471 |
| 1472 for (mhi = mht->mht_buckets[i]; mhi != NULL; mhi = mhi->mhi_next) | |
| 1473 { | |
| 1474 j = (mhi->mhi_key >> shift) & (MHT_GROWTH_FACTOR - 1); | |
| 1475 if (tails[j] == NULL) | |
| 1476 { | |
| 1477 buckets[i + (j << shift)] = mhi; | |
| 1478 tails[j] = mhi; | |
| 1479 mhi->mhi_prev = NULL; | |
| 1480 } | |
| 1481 else | |
| 1482 { | |
| 1483 tails[j]->mhi_next = mhi; | |
| 1484 mhi->mhi_prev = tails[j]; | |
| 1485 tails[j] = mhi; | |
| 1486 } | |
| 1487 } | |
| 1488 | |
| 1489 for (j = 0; j < MHT_GROWTH_FACTOR; j++) | |
| 1490 if (tails[j] != NULL) | |
| 1491 tails[j]->mhi_next = NULL; | |
| 1492 } | |
| 1493 | |
| 1494 if (mht->mht_buckets != mht->mht_small_buckets) | |
| 1495 vim_free(mht->mht_buckets); | |
| 1496 | |
| 1497 mht->mht_buckets = buckets; | |
| 1498 mht->mht_mask = (mht->mht_mask + 1) * MHT_GROWTH_FACTOR - 1; | |
| 1499 | |
| 1500 return OK; | |
| 1501 } |