Mercurial > vim
annotate src/memfile.c @ 32503:5d07e7e9580f v9.0.1583
patch 9.0.1583: get E304 when using 'cryptmethod' "xchacha20v2"
Commit: https://github.com/vim/vim/commit/3a2a60ce4a8e73594bca16814672fcc243d093ac
Author: Bram Moolenaar <Bram@vim.org>
Date: Sat May 27 18:02:55 2023 +0100
patch 9.0.1583: get E304 when using 'cryptmethod' "xchacha20v2"
Problem: Get E304 when using 'cryptmethod' "xchacha20v2". (Steve Mynott)
Solution: Add 4th crypt method to block zero ID check. Avoid syncing a swap
file before reading the file. (closes #12433)
| author | Bram Moolenaar <Bram@vim.org> |
|---|---|
| date | Sat, 27 May 2023 19:15:04 +0200 |
| parents | 9b0c304500cc |
| children | bb5458706799 |
| 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; |
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153 mfp->mf_dirty = MF_DIRTY_NO; |
| 7 | 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 | |
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227 mfp->mf_dirty = MF_DIRTY_YES; |
| 7 | 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 |
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389 mfp->mf_dirty = MF_DIRTY_YES; |
| 7 | 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); | |
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434 if (hp == NULL && page_count > 0) |
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435 hp = mf_alloc_bhdr(mfp, page_count); |
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436 if (hp == NULL) |
| 7 | 437 return NULL; |
| 438 | |
| 439 hp->bh_bnum = nr; | |
| 440 hp->bh_flags = 0; | |
| 441 hp->bh_page_count = page_count; | |
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442 if (mf_read(mfp, hp) == FAIL) // cannot read the block! |
| 7 | 443 { |
| 444 mf_free_bhdr(hp); | |
| 445 return NULL; | |
| 446 } | |
| 447 } | |
| 448 else | |
| 449 { | |
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450 mf_rem_used(mfp, hp); // remove from list, insert in front below |
| 7 | 451 mf_rem_hash(mfp, hp); |
| 452 } | |
| 453 | |
| 454 hp->bh_flags |= BH_LOCKED; | |
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455 mf_ins_used(mfp, hp); // put in front of used list |
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456 mf_ins_hash(mfp, hp); // put in front of hash list |
| 7 | 457 |
| 458 return hp; | |
| 459 } | |
| 460 | |
| 461 /* | |
| 462 * release the block *hp | |
| 463 * | |
| 464 * dirty: Block must be written to file later | |
| 465 * infile: Block should be in file (needed for recovery) | |
| 466 * | |
| 467 * no return value, function cannot fail | |
| 468 */ | |
| 469 void | |
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470 mf_put( |
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471 memfile_T *mfp, |
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472 bhdr_T *hp, |
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473 int dirty, |
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474 int infile) |
| 7 | 475 { |
| 476 int flags; | |
| 477 | |
| 478 flags = hp->bh_flags; | |
| 479 | |
| 480 if ((flags & BH_LOCKED) == 0) | |
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481 iemsg(_(e_block_was_not_locked)); |
| 7 | 482 flags &= ~BH_LOCKED; |
| 483 if (dirty) | |
| 484 { | |
| 485 flags |= BH_DIRTY; | |
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486 if (mfp->mf_dirty != MF_DIRTY_YES_NOSYNC) |
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487 mfp->mf_dirty = MF_DIRTY_YES; |
| 7 | 488 } |
| 489 hp->bh_flags = flags; | |
| 490 if (infile) | |
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491 mf_trans_add(mfp, hp); // may translate negative in positive nr |
| 7 | 492 } |
| 493 | |
| 494 /* | |
| 495 * block *hp is no longer in used, may put it in the free list of memfile *mfp | |
| 496 */ | |
| 497 void | |
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498 mf_free(memfile_T *mfp, bhdr_T *hp) |
| 7 | 499 { |
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500 vim_free(hp->bh_data); // free the memory |
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501 mf_rem_hash(mfp, hp); // get *hp out of the hash list |
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502 mf_rem_used(mfp, hp); // get *hp out of the used list |
| 7 | 503 if (hp->bh_bnum < 0) |
| 504 { | |
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505 vim_free(hp); // don't want negative numbers in free list |
| 7 | 506 mfp->mf_neg_count--; |
| 507 } | |
| 508 else | |
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509 mf_ins_free(mfp, hp); // put *hp in the free list |
| 7 | 510 } |
| 511 | |
| 512 /* | |
| 513 * Sync the memory file *mfp to disk. | |
| 514 * Flags: | |
| 515 * MFS_ALL If not given, blocks with negative numbers are not synced, | |
| 516 * even when they are dirty! | |
| 517 * MFS_STOP Stop syncing when a character becomes available, but sync at | |
| 518 * least one block. | |
| 519 * MFS_FLUSH Make sure buffers are flushed to disk, so they will survive a | |
| 520 * system crash. | |
| 521 * MFS_ZERO Only write block 0. | |
| 522 * | |
| 523 * Return FAIL for failure, OK otherwise | |
| 524 */ | |
| 525 int | |
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526 mf_sync(memfile_T *mfp, int flags) |
| 7 | 527 { |
| 528 int status; | |
| 529 bhdr_T *hp; | |
| 530 int got_int_save = got_int; | |
| 531 | |
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532 if (mfp->mf_fd < 0) |
| 7 | 533 { |
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534 // there is no file, nothing to do |
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535 mfp->mf_dirty = MF_DIRTY_NO; |
| 7 | 536 return FAIL; |
| 537 } | |
| 538 | |
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539 // Only a CTRL-C while writing will break us here, not one typed |
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540 // previously. |
| 7 | 541 got_int = FALSE; |
| 542 | |
| 543 /* | |
| 544 * sync from last to first (may reduce the probability of an inconsistent | |
| 545 * file) If a write fails, it is very likely caused by a full filesystem. | |
| 546 * Then we only try to write blocks within the existing file. If that also | |
| 547 * fails then we give up. | |
| 548 */ | |
| 549 status = OK; | |
| 550 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev) | |
| 551 if (((flags & MFS_ALL) || hp->bh_bnum >= 0) | |
| 552 && (hp->bh_flags & BH_DIRTY) | |
| 553 && (status == OK || (hp->bh_bnum >= 0 | |
| 554 && hp->bh_bnum < mfp->mf_infile_count))) | |
| 555 { | |
| 556 if ((flags & MFS_ZERO) && hp->bh_bnum != 0) | |
| 557 continue; | |
| 558 if (mf_write(mfp, hp) == FAIL) | |
| 559 { | |
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560 if (status == FAIL) // double error: quit syncing |
| 7 | 561 break; |
| 562 status = FAIL; | |
| 563 } | |
| 564 if (flags & MFS_STOP) | |
| 565 { | |
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566 // Stop when char available now. |
| 7 | 567 if (ui_char_avail()) |
| 568 break; | |
| 569 } | |
| 570 else | |
| 571 ui_breakcheck(); | |
| 572 if (got_int) | |
| 573 break; | |
| 574 } | |
| 575 | |
| 576 /* | |
| 577 * If the whole list is flushed, the memfile is not dirty anymore. | |
| 578 * In case of an error this flag is also set, to avoid trying all the time. | |
| 579 */ | |
| 580 if (hp == NULL || status == FAIL) | |
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581 mfp->mf_dirty = MF_DIRTY_NO; |
| 7 | 582 |
| 583 if ((flags & MFS_FLUSH) && *p_sws != NUL) | |
| 584 { | |
| 585 #if defined(UNIX) | |
| 586 # ifdef HAVE_FSYNC | |
| 587 /* | |
| 588 * most Unixes have the very useful fsync() function, just what we need. | |
| 589 */ | |
| 590 if (STRCMP(p_sws, "fsync") == 0) | |
| 591 { | |
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592 if (vim_fsync(mfp->mf_fd)) |
| 7 | 593 status = FAIL; |
| 594 } | |
| 595 else | |
| 596 # endif | |
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597 // OpenNT is strictly POSIX (Benzinger) |
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598 // Tandem/Himalaya NSK-OSS doesn't have sync() |
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599 // No sync() on Stratus VOS |
| 6637 | 600 # if defined(__OPENNT) || defined(__TANDEM) || defined(__VOS__) |
| 7 | 601 fflush(NULL); |
| 602 # else | |
| 603 sync(); | |
| 604 # endif | |
| 605 #endif | |
| 606 #ifdef VMS | |
| 607 if (STRCMP(p_sws, "fsync") == 0) | |
| 608 { | |
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609 if (vim_fsync(mfp->mf_fd)) |
| 7 | 610 status = FAIL; |
| 611 } | |
| 612 #endif | |
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613 #ifdef MSWIN |
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614 if (_commit(mfp->mf_fd)) |
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615 status = FAIL; |
| 7 | 616 #endif |
| 617 #ifdef AMIGA | |
| 1030 | 618 # if defined(__AROS__) || defined(__amigaos4__) |
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619 if (vim_fsync(mfp->mf_fd) != 0) |
| 7 | 620 status = FAIL; |
| 621 # else | |
| 622 /* | |
| 623 * Flush() only exists for AmigaDos 2.0. | |
| 624 * For 1.3 it should be done with close() + open(), but then the risk | |
| 625 * is that the open() may fail and lose the file.... | |
| 626 */ | |
| 627 # ifdef FEAT_ARP | |
| 628 if (dos2) | |
| 629 # endif | |
| 630 # ifdef SASC | |
| 631 { | |
| 632 struct UFB *fp = chkufb(mfp->mf_fd); | |
| 633 | |
| 634 if (fp != NULL) | |
| 635 Flush(fp->ufbfh); | |
| 636 } | |
| 637 # else | |
| 638 # if defined(_DCC) || defined(__GNUC__) || defined(__MORPHOS__) | |
| 639 { | |
| 984 | 640 # if defined(__GNUC__) && !defined(__MORPHOS__) && defined(__libnix__) |
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641 // Have function (in libnix at least), |
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642 // but ain't got no prototype anywhere. |
| 7 | 643 extern unsigned long fdtofh(int filedescriptor); |
| 644 # endif | |
| 984 | 645 # if !defined(__libnix__) |
| 646 fflush(NULL); | |
| 647 # else | |
| 7 | 648 BPTR fh = (BPTR)fdtofh(mfp->mf_fd); |
| 649 | |
| 650 if (fh != 0) | |
| 651 Flush(fh); | |
| 984 | 652 # endif |
| 7 | 653 } |
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654 # else // assume Manx |
| 7 | 655 Flush(_devtab[mfp->mf_fd].fd); |
| 656 # endif | |
| 657 # endif | |
| 658 # endif | |
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659 #endif // AMIGA |
| 7 | 660 } |
| 661 | |
| 662 got_int |= got_int_save; | |
| 663 | |
| 664 return status; | |
| 665 } | |
| 666 | |
| 667 /* | |
| 630 | 668 * For all blocks in memory file *mfp that have a positive block number set |
| 669 * the dirty flag. These are blocks that need to be written to a newly | |
| 670 * created swapfile. | |
| 671 */ | |
| 672 void | |
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673 mf_set_dirty(memfile_T *mfp) |
| 630 | 674 { |
| 675 bhdr_T *hp; | |
| 676 | |
| 677 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev) | |
| 678 if (hp->bh_bnum > 0) | |
| 679 hp->bh_flags |= BH_DIRTY; | |
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680 mfp->mf_dirty = MF_DIRTY_YES; |
| 630 | 681 } |
| 682 | |
| 683 /* | |
| 7 | 684 * insert block *hp in front of hashlist of memfile *mfp |
| 685 */ | |
| 686 static void | |
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687 mf_ins_hash(memfile_T *mfp, bhdr_T *hp) |
| 7 | 688 { |
| 2730 | 689 mf_hash_add_item(&mfp->mf_hash, (mf_hashitem_T *)hp); |
| 7 | 690 } |
| 691 | |
| 692 /* | |
| 693 * remove block *hp from hashlist of memfile list *mfp | |
| 694 */ | |
| 695 static void | |
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696 mf_rem_hash(memfile_T *mfp, bhdr_T *hp) |
| 7 | 697 { |
| 2730 | 698 mf_hash_rem_item(&mfp->mf_hash, (mf_hashitem_T *)hp); |
| 7 | 699 } |
| 700 | |
| 701 /* | |
| 702 * look in hash lists of memfile *mfp for block header with number 'nr' | |
| 703 */ | |
| 704 static bhdr_T * | |
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705 mf_find_hash(memfile_T *mfp, blocknr_T nr) |
| 7 | 706 { |
| 2730 | 707 return (bhdr_T *)mf_hash_find(&mfp->mf_hash, nr); |
| 7 | 708 } |
| 709 | |
| 710 /* | |
| 711 * insert block *hp in front of used list of memfile *mfp | |
| 712 */ | |
| 713 static void | |
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714 mf_ins_used(memfile_T *mfp, bhdr_T *hp) |
| 7 | 715 { |
| 716 hp->bh_next = mfp->mf_used_first; | |
| 717 mfp->mf_used_first = hp; | |
| 718 hp->bh_prev = NULL; | |
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719 if (hp->bh_next == NULL) // list was empty, adjust last pointer |
| 7 | 720 mfp->mf_used_last = hp; |
| 721 else | |
| 722 hp->bh_next->bh_prev = hp; | |
| 723 mfp->mf_used_count += hp->bh_page_count; | |
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724 total_mem_used += (long_u)hp->bh_page_count * mfp->mf_page_size; |
| 7 | 725 } |
| 726 | |
| 727 /* | |
| 728 * remove block *hp from used list of memfile *mfp | |
| 729 */ | |
| 730 static void | |
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731 mf_rem_used(memfile_T *mfp, bhdr_T *hp) |
| 7 | 732 { |
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733 if (hp->bh_next == NULL) // last block in used list |
| 7 | 734 mfp->mf_used_last = hp->bh_prev; |
| 735 else | |
| 736 hp->bh_next->bh_prev = hp->bh_prev; | |
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737 if (hp->bh_prev == NULL) // first block in used list |
| 7 | 738 mfp->mf_used_first = hp->bh_next; |
| 739 else | |
| 740 hp->bh_prev->bh_next = hp->bh_next; | |
| 741 mfp->mf_used_count -= hp->bh_page_count; | |
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742 total_mem_used -= (long_u)hp->bh_page_count * mfp->mf_page_size; |
| 7 | 743 } |
| 744 | |
| 745 /* | |
| 746 * Release the least recently used block from the used list if the number | |
| 747 * of used memory blocks gets to big. | |
| 748 * | |
| 749 * Return the block header to the caller, including the memory block, so | |
| 750 * it can be re-used. Make sure the page_count is right. | |
| 6817 | 751 * |
| 752 * Returns NULL if no block is released. | |
| 7 | 753 */ |
| 754 static bhdr_T * | |
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755 mf_release(memfile_T *mfp, int page_count) |
| 7 | 756 { |
| 757 bhdr_T *hp; | |
| 758 int need_release; | |
| 759 buf_T *buf; | |
| 760 | |
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761 // don't release while in mf_close_file() |
| 1066 | 762 if (mf_dont_release) |
| 7 | 763 return NULL; |
| 764 | |
| 765 /* | |
| 766 * Need to release a block if the number of blocks for this memfile is | |
| 767 * higher than the maximum or total memory used is over 'maxmemtot' | |
| 768 */ | |
| 769 need_release = ((mfp->mf_used_count >= mfp->mf_used_count_max) | |
| 770 || (total_mem_used >> 10) >= (long_u)p_mmt); | |
| 771 | |
| 772 /* | |
| 773 * Try to create a swap file if the amount of memory used is getting too | |
| 774 * high. | |
| 775 */ | |
| 776 if (mfp->mf_fd < 0 && need_release && p_uc) | |
| 777 { | |
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778 // find for which buffer this memfile is |
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779 FOR_ALL_BUFFERS(buf) |
| 7 | 780 if (buf->b_ml.ml_mfp == mfp) |
| 781 break; | |
| 782 if (buf != NULL && buf->b_may_swap) | |
| 783 ml_open_file(buf); | |
| 784 } | |
| 785 | |
| 786 /* | |
| 787 * don't release a block if | |
| 788 * there is no file for this memfile | |
| 789 * or | |
| 790 * the number of blocks for this memfile is lower than the maximum | |
| 791 * and | |
| 792 * total memory used is not up to 'maxmemtot' | |
| 793 */ | |
| 794 if (mfp->mf_fd < 0 || !need_release) | |
| 795 return NULL; | |
| 796 | |
| 797 for (hp = mfp->mf_used_last; hp != NULL; hp = hp->bh_prev) | |
| 798 if (!(hp->bh_flags & BH_LOCKED)) | |
| 799 break; | |
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800 if (hp == NULL) // not a single one that can be released |
| 7 | 801 return NULL; |
| 802 | |
| 803 /* | |
| 804 * If the block is dirty, write it. | |
| 805 * If the write fails we don't free it. | |
| 806 */ | |
| 807 if ((hp->bh_flags & BH_DIRTY) && mf_write(mfp, hp) == FAIL) | |
| 808 return NULL; | |
| 809 | |
| 810 mf_rem_used(mfp, hp); | |
| 811 mf_rem_hash(mfp, hp); | |
| 812 | |
| 813 /* | |
| 814 * If a bhdr_T is returned, make sure that the page_count of bh_data is | |
| 815 * right | |
| 816 */ | |
| 817 if (hp->bh_page_count != page_count) | |
| 818 { | |
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819 VIM_CLEAR(hp->bh_data); |
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820 if (page_count > 0) |
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821 hp->bh_data = alloc((size_t)mfp->mf_page_size * page_count); |
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822 if (hp->bh_data == NULL) |
| 7 | 823 { |
| 824 vim_free(hp); | |
| 825 return NULL; | |
| 826 } | |
| 827 hp->bh_page_count = page_count; | |
| 828 } | |
| 829 return hp; | |
| 830 } | |
| 831 | |
| 832 /* | |
| 833 * release as many blocks as possible | |
| 834 * Used in case of out of memory | |
| 835 * | |
| 836 * return TRUE if any memory was released | |
| 837 */ | |
| 838 int | |
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839 mf_release_all(void) |
| 7 | 840 { |
| 841 buf_T *buf; | |
| 842 memfile_T *mfp; | |
| 843 bhdr_T *hp; | |
| 844 int retval = FALSE; | |
| 845 | |
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846 FOR_ALL_BUFFERS(buf) |
| 7 | 847 { |
| 848 mfp = buf->b_ml.ml_mfp; | |
| 849 if (mfp != NULL) | |
| 850 { | |
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851 // If no swap file yet, may open one |
| 7 | 852 if (mfp->mf_fd < 0 && buf->b_may_swap) |
| 853 ml_open_file(buf); | |
| 854 | |
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855 // only if there is a swapfile |
| 7 | 856 if (mfp->mf_fd >= 0) |
| 857 { | |
| 858 for (hp = mfp->mf_used_last; hp != NULL; ) | |
| 859 { | |
| 860 if (!(hp->bh_flags & BH_LOCKED) | |
| 861 && (!(hp->bh_flags & BH_DIRTY) | |
| 862 || mf_write(mfp, hp) != FAIL)) | |
| 863 { | |
| 864 mf_rem_used(mfp, hp); | |
| 865 mf_rem_hash(mfp, hp); | |
| 866 mf_free_bhdr(hp); | |
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867 hp = mfp->mf_used_last; // re-start, list was changed |
| 7 | 868 retval = TRUE; |
| 869 } | |
| 870 else | |
| 871 hp = hp->bh_prev; | |
| 872 } | |
| 873 } | |
| 874 } | |
| 875 } | |
| 876 return retval; | |
| 877 } | |
| 878 | |
| 879 /* | |
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880 * Allocate a block header and a block of memory for it. |
| 7 | 881 */ |
| 882 static bhdr_T * | |
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883 mf_alloc_bhdr(memfile_T *mfp, int page_count) |
| 7 | 884 { |
| 885 bhdr_T *hp; | |
| 886 | |
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887 if ((hp = ALLOC_ONE(bhdr_T)) == NULL) |
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888 return NULL; |
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889 |
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890 if ((hp->bh_data = alloc((size_t)mfp->mf_page_size * page_count)) == NULL) |
| 7 | 891 { |
|
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892 vim_free(hp); // not enough memory |
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893 return NULL; |
| 7 | 894 } |
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895 hp->bh_page_count = page_count; |
| 7 | 896 return hp; |
| 897 } | |
| 898 | |
| 899 /* | |
|
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900 * Free a block header and the block of memory for it. |
| 7 | 901 */ |
| 902 static void | |
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903 mf_free_bhdr(bhdr_T *hp) |
| 7 | 904 { |
| 905 vim_free(hp->bh_data); | |
| 906 vim_free(hp); | |
| 907 } | |
| 908 | |
| 909 /* | |
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910 * Insert entry *hp in the free list. |
| 7 | 911 */ |
| 912 static void | |
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913 mf_ins_free(memfile_T *mfp, bhdr_T *hp) |
| 7 | 914 { |
| 915 hp->bh_next = mfp->mf_free_first; | |
| 916 mfp->mf_free_first = hp; | |
| 917 } | |
| 918 | |
| 919 /* | |
| 920 * remove the first entry from the free list and return a pointer to it | |
| 921 * Note: caller must check that mfp->mf_free_first is not NULL! | |
| 922 */ | |
| 923 static bhdr_T * | |
|
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924 mf_rem_free(memfile_T *mfp) |
| 7 | 925 { |
| 926 bhdr_T *hp; | |
| 927 | |
| 928 hp = mfp->mf_free_first; | |
| 929 mfp->mf_free_first = hp->bh_next; | |
| 930 return hp; | |
| 931 } | |
| 932 | |
| 933 /* | |
| 934 * read a block from disk | |
| 935 * | |
| 936 * Return FAIL for failure, OK otherwise | |
| 937 */ | |
| 938 static int | |
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939 mf_read(memfile_T *mfp, bhdr_T *hp) |
| 7 | 940 { |
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941 off_T offset; |
| 7 | 942 unsigned page_size; |
| 943 unsigned size; | |
| 944 | |
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945 if (mfp->mf_fd < 0) // there is no file, can't read |
| 7 | 946 return FAIL; |
| 947 | |
| 948 page_size = mfp->mf_page_size; | |
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949 offset = (off_T)page_size * hp->bh_bnum; |
| 7 | 950 size = page_size * hp->bh_page_count; |
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951 if (vim_lseek(mfp->mf_fd, offset, SEEK_SET) != offset) |
| 7 | 952 { |
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953 PERROR(_(e_seek_error_in_swap_file_read)); |
| 7 | 954 return FAIL; |
| 955 } | |
| 2664 | 956 if ((unsigned)read_eintr(mfp->mf_fd, hp->bh_data, size) != size) |
| 7 | 957 { |
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958 PERROR(_(e_read_error_in_swap_file)); |
| 7 | 959 return FAIL; |
| 960 } | |
| 2267 | 961 |
| 962 #ifdef FEAT_CRYPT | |
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963 // Decrypt if 'key' is set and this is a data block. And when changing the |
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964 // key. |
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965 if (*mfp->mf_buffer->b_p_key != NUL || mfp->mf_old_key != NULL) |
| 2267 | 966 ml_decrypt_data(mfp, hp->bh_data, offset, size); |
| 967 #endif | |
| 968 | |
| 7 | 969 return OK; |
| 970 } | |
| 971 | |
| 972 /* | |
| 973 * write a block to disk | |
| 974 * | |
| 975 * Return FAIL for failure, OK otherwise | |
| 976 */ | |
| 977 static int | |
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978 mf_write(memfile_T *mfp, bhdr_T *hp) |
| 7 | 979 { |
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980 off_T offset; // offset in the file |
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981 blocknr_T nr; // block nr which is being written |
| 7 | 982 bhdr_T *hp2; |
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983 unsigned page_size; // number of bytes in a page |
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984 unsigned page_count; // number of pages written |
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985 unsigned size; // number of bytes written |
| 7 | 986 |
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987 if (mfp->mf_fd < 0 && !mfp->mf_reopen) |
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988 // there is no file and there was no file, can't write |
| 7 | 989 return FAIL; |
| 990 | |
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991 if (hp->bh_bnum < 0) // must assign file block number |
| 7 | 992 if (mf_trans_add(mfp, hp) == FAIL) |
| 993 return FAIL; | |
| 994 | |
| 995 page_size = mfp->mf_page_size; | |
| 996 | |
| 997 /* | |
| 998 * We don't want gaps in the file. Write the blocks in front of *hp | |
| 999 * to extend the file. | |
| 1000 * If block 'mf_infile_count' is not in the hash list, it has been | |
| 1001 * freed. Fill the space in the file with data from the current block. | |
| 1002 */ | |
| 1003 for (;;) | |
| 1004 { | |
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1005 int attempt; |
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1006 |
| 7 | 1007 nr = hp->bh_bnum; |
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1008 if (nr > mfp->mf_infile_count) // beyond end of file |
| 7 | 1009 { |
| 1010 nr = mfp->mf_infile_count; | |
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1011 hp2 = mf_find_hash(mfp, nr); // NULL caught below |
| 7 | 1012 } |
| 1013 else | |
| 1014 hp2 = hp; | |
| 1015 | |
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1016 offset = (off_T)page_size * nr; |
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1017 if (hp2 == NULL) // freed block, fill with dummy data |
| 7 | 1018 page_count = 1; |
| 1019 else | |
| 1020 page_count = hp2->bh_page_count; | |
| 1021 size = page_size * page_count; | |
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1022 |
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1023 for (attempt = 1; attempt <= 2; ++attempt) |
| 7 | 1024 { |
|
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1025 if (mfp->mf_fd >= 0) |
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1026 { |
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1027 if (vim_lseek(mfp->mf_fd, offset, SEEK_SET) != offset) |
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1028 { |
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1029 PERROR(_(e_seek_error_in_swap_file_write)); |
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1030 return FAIL; |
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1031 } |
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1032 if (mf_write_block(mfp, |
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1033 hp2 == NULL ? hp : hp2, offset, size) == OK) |
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1034 break; |
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1035 } |
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1036 |
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1037 if (attempt == 1) |
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1038 { |
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1039 // If the swap file is on a network drive, and the network |
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1040 // gets disconnected and then re-connected, we can maybe fix it |
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1041 // by closing and then re-opening the file. |
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1042 if (mfp->mf_fd >= 0) |
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1043 close(mfp->mf_fd); |
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1044 mfp->mf_fd = mch_open_rw((char *)mfp->mf_fname, mfp->mf_flags); |
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1045 mfp->mf_reopen = (mfp->mf_fd < 0); |
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1046 } |
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1047 if (attempt == 2 || mfp->mf_fd < 0) |
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1048 { |
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1049 // Avoid repeating the error message, this mostly happens when |
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1050 // the disk is full. We give the message again only after a |
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1051 // successful write or when hitting a key. We keep on trying, |
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1052 // in case some space becomes available. |
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1053 if (!did_swapwrite_msg) |
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1054 emsg(_(e_write_error_in_swap_file)); |
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1055 did_swapwrite_msg = TRUE; |
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1056 return FAIL; |
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1057 } |
| 7 | 1058 } |
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1059 |
| 7 | 1060 did_swapwrite_msg = FALSE; |
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1061 if (hp2 != NULL) // written a non-dummy block |
| 7 | 1062 hp2->bh_flags &= ~BH_DIRTY; |
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1063 // appended to the file |
| 7 | 1064 if (nr + (blocknr_T)page_count > mfp->mf_infile_count) |
| 1065 mfp->mf_infile_count = nr + page_count; | |
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1066 if (nr == hp->bh_bnum) // written the desired block |
| 7 | 1067 break; |
| 1068 } | |
| 1069 return OK; | |
| 1070 } | |
| 1071 | |
| 1072 /* | |
| 2267 | 1073 * Write block "hp" with data size "size" to file "mfp->mf_fd". |
| 1074 * Takes care of encryption. | |
| 1075 * Return FAIL or OK. | |
| 1076 */ | |
| 1077 static int | |
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1078 mf_write_block( |
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1079 memfile_T *mfp, |
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1080 bhdr_T *hp, |
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1081 off_T offset UNUSED, |
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1082 unsigned size) |
| 2267 | 1083 { |
| 1084 char_u *data = hp->bh_data; | |
| 1085 int result = OK; | |
| 1086 | |
| 1087 #ifdef FEAT_CRYPT | |
|
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1088 // Encrypt if 'key' is set and this is a data block. |
| 2267 | 1089 if (*mfp->mf_buffer->b_p_key != NUL) |
| 1090 { | |
| 1091 data = ml_encrypt_data(mfp, data, offset, size); | |
| 1092 if (data == NULL) | |
| 1093 return FAIL; | |
| 1094 } | |
| 1095 #endif | |
| 1096 | |
| 2664 | 1097 if ((unsigned)write_eintr(mfp->mf_fd, data, size) != size) |
| 2267 | 1098 result = FAIL; |
| 1099 | |
| 1100 #ifdef FEAT_CRYPT | |
| 1101 if (data != hp->bh_data) | |
| 1102 vim_free(data); | |
| 1103 #endif | |
| 1104 | |
| 1105 return result; | |
| 1106 } | |
| 1107 | |
| 1108 /* | |
| 7 | 1109 * Make block number for *hp positive and add it to the translation list |
| 1110 * | |
| 1111 * Return FAIL for failure, OK otherwise | |
| 1112 */ | |
| 1113 static int | |
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1114 mf_trans_add(memfile_T *mfp, bhdr_T *hp) |
| 7 | 1115 { |
| 1116 bhdr_T *freep; | |
| 1117 blocknr_T new_bnum; | |
| 1118 NR_TRANS *np; | |
| 1119 int page_count; | |
| 1120 | |
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1121 if (hp->bh_bnum >= 0) // it's already positive |
| 7 | 1122 return OK; |
| 1123 | |
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1124 if ((np = ALLOC_ONE(NR_TRANS)) == NULL) |
| 7 | 1125 return FAIL; |
| 1126 | |
| 1127 /* | |
| 2267 | 1128 * Get a new number for the block. |
| 7 | 1129 * If the first item in the free list has sufficient pages, use its number |
| 1130 * Otherwise use mf_blocknr_max. | |
| 1131 */ | |
| 1132 freep = mfp->mf_free_first; | |
| 1133 page_count = hp->bh_page_count; | |
| 1134 if (freep != NULL && freep->bh_page_count >= page_count) | |
| 1135 { | |
| 1136 new_bnum = freep->bh_bnum; | |
| 1137 /* | |
| 4352 | 1138 * If the page count of the free block was larger, reduce it. |
| 7 | 1139 * If the page count matches, remove the block from the free list |
| 1140 */ | |
| 1141 if (freep->bh_page_count > page_count) | |
| 1142 { | |
| 1143 freep->bh_bnum += page_count; | |
| 1144 freep->bh_page_count -= page_count; | |
| 1145 } | |
| 1146 else | |
| 1147 { | |
| 1148 freep = mf_rem_free(mfp); | |
| 1149 vim_free(freep); | |
| 1150 } | |
| 1151 } | |
| 1152 else | |
| 1153 { | |
| 1154 new_bnum = mfp->mf_blocknr_max; | |
| 1155 mfp->mf_blocknr_max += page_count; | |
| 1156 } | |
| 1157 | |
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1158 np->nt_old_bnum = hp->bh_bnum; // adjust number |
| 7 | 1159 np->nt_new_bnum = new_bnum; |
| 1160 | |
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1161 mf_rem_hash(mfp, hp); // remove from old hash list |
| 7 | 1162 hp->bh_bnum = new_bnum; |
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1163 mf_ins_hash(mfp, hp); // insert in new hash list |
| 7 | 1164 |
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1165 // Insert "np" into "mf_trans" hashtable with key "np->nt_old_bnum" |
| 2730 | 1166 mf_hash_add_item(&mfp->mf_trans, (mf_hashitem_T *)np); |
| 7 | 1167 |
| 1168 return OK; | |
| 1169 } | |
| 1170 | |
| 1171 /* | |
| 6817 | 1172 * Lookup a translation from the trans lists and delete the entry. |
| 7 | 1173 * |
| 1174 * Return the positive new number when found, the old number when not found | |
| 1175 */ | |
| 1176 blocknr_T | |
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1177 mf_trans_del(memfile_T *mfp, blocknr_T old_nr) |
| 7 | 1178 { |
| 1179 NR_TRANS *np; | |
| 1180 blocknr_T new_bnum; | |
| 1181 | |
| 2730 | 1182 np = (NR_TRANS *)mf_hash_find(&mfp->mf_trans, old_nr); |
| 1183 | |
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1184 if (np == NULL) // not found |
| 7 | 1185 return old_nr; |
| 1186 | |
| 1187 mfp->mf_neg_count--; | |
| 1188 new_bnum = np->nt_new_bnum; | |
| 2730 | 1189 |
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1190 // remove entry from the trans list |
| 2730 | 1191 mf_hash_rem_item(&mfp->mf_trans, (mf_hashitem_T *)np); |
| 1192 | |
| 7 | 1193 vim_free(np); |
| 1194 | |
| 1195 return new_bnum; | |
| 1196 } | |
| 1197 | |
| 1198 /* | |
| 1199 * Set mfp->mf_ffname according to mfp->mf_fname and some other things. | |
| 1200 * Only called when creating or renaming the swapfile. Either way it's a new | |
| 1201 * name so we must work out the full path name. | |
| 1202 */ | |
| 1203 void | |
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1204 mf_set_ffname(memfile_T *mfp) |
| 7 | 1205 { |
| 1206 mfp->mf_ffname = FullName_save(mfp->mf_fname, FALSE); | |
| 1207 } | |
| 1208 | |
| 1209 /* | |
| 1210 * Make the name of the file used for the memfile a full path. | |
| 1211 * Used before doing a :cd | |
| 1212 */ | |
| 1213 void | |
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1214 mf_fullname(memfile_T *mfp) |
| 7 | 1215 { |
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1216 if (mfp == NULL || mfp->mf_fname == NULL || mfp->mf_ffname == NULL) |
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1217 return; |
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1218 |
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1219 vim_free(mfp->mf_fname); |
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1220 mfp->mf_fname = mfp->mf_ffname; |
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1221 mfp->mf_ffname = NULL; |
| 7 | 1222 } |
| 1223 | |
| 1224 /* | |
| 1225 * return TRUE if there are any translations pending for 'mfp' | |
| 1226 */ | |
| 1227 int | |
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1228 mf_need_trans(memfile_T *mfp) |
| 7 | 1229 { |
| 1230 return (mfp->mf_fname != NULL && mfp->mf_neg_count > 0); | |
| 1231 } | |
| 1232 | |
| 1233 /* | |
| 1234 * Open a swap file for a memfile. | |
| 1235 * The "fname" must be in allocated memory, and is consumed (also when an | |
| 1236 * error occurs). | |
| 1237 */ | |
| 1238 static void | |
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1239 mf_do_open( |
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1240 memfile_T *mfp, |
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1241 char_u *fname, |
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1242 int flags) // flags for open() |
| 7 | 1243 { |
| 1244 #ifdef HAVE_LSTAT | |
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1245 stat_T sb; |
| 7 | 1246 #endif |
| 1247 | |
| 1248 mfp->mf_fname = fname; | |
| 1249 | |
| 1250 /* | |
| 1251 * Get the full path name before the open, because this is | |
| 1252 * not possible after the open on the Amiga. | |
| 1253 * fname cannot be NameBuff, because it must have been allocated. | |
| 1254 */ | |
| 1255 mf_set_ffname(mfp); | |
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1256 #if defined(MSWIN) |
| 7 | 1257 /* |
| 4352 | 1258 * A ":!cd e:xxx" may change the directory without us knowing, use the |
| 7 | 1259 * full pathname always. Careful: This frees fname! |
| 1260 */ | |
| 1261 mf_fullname(mfp); | |
| 1262 #endif | |
| 1263 | |
| 1264 #ifdef HAVE_LSTAT | |
| 1265 /* | |
| 1266 * Extra security check: When creating a swap file it really shouldn't | |
| 1267 * exist yet. If there is a symbolic link, this is most likely an attack. | |
| 1268 */ | |
| 1269 if ((flags & O_CREAT) && mch_lstat((char *)mfp->mf_fname, &sb) >= 0) | |
| 1270 { | |
| 1271 mfp->mf_fd = -1; | |
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1272 emsg(_(e_swap_file_already_exists_symlink_attack)); |
| 7 | 1273 } |
| 1274 else | |
| 1275 #endif | |
| 1276 { | |
| 1277 /* | |
| 1278 * try to open the file | |
| 1279 */ | |
| 557 | 1280 flags |= O_EXTRA | O_NOFOLLOW; |
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1281 #ifdef MSWIN |
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1282 // Prevent handle inheritance that cause problems with Cscope |
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1283 // (swap file may not be deleted if cscope connection was open after |
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1284 // the file) |
| 7 | 1285 flags |= O_NOINHERIT; |
| 1286 #endif | |
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1287 mfp->mf_flags = flags; |
| 7 | 1288 mfp->mf_fd = mch_open_rw((char *)mfp->mf_fname, flags); |
| 1289 } | |
| 1290 | |
| 1291 /* | |
| 1292 * If the file cannot be opened, use memory only | |
| 1293 */ | |
| 1294 if (mfp->mf_fd < 0) | |
| 1295 { | |
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1296 VIM_CLEAR(mfp->mf_fname); |
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1297 VIM_CLEAR(mfp->mf_ffname); |
| 7 | 1298 } |
| 1299 else | |
| 1583 | 1300 { |
| 2003 | 1301 #ifdef HAVE_FD_CLOEXEC |
| 1302 int fdflags = fcntl(mfp->mf_fd, F_GETFD); | |
| 1303 if (fdflags >= 0 && (fdflags & FD_CLOEXEC) == 0) | |
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1304 (void)fcntl(mfp->mf_fd, F_SETFD, fdflags | FD_CLOEXEC); |
| 2003 | 1305 #endif |
| 5788 | 1306 #if defined(HAVE_SELINUX) || defined(HAVE_SMACK) |
| 1583 | 1307 mch_copy_sec(fname, mfp->mf_fname); |
| 1308 #endif | |
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1309 mch_hide(mfp->mf_fname); // try setting the 'hidden' flag |
| 1583 | 1310 } |
| 7 | 1311 } |
| 2730 | 1312 |
| 1313 /* | |
| 1314 * Implementation of mf_hashtab_T follows. | |
| 1315 */ | |
| 1316 | |
| 1317 /* | |
| 1318 * The number of buckets in the hashtable is increased by a factor of | |
| 1319 * MHT_GROWTH_FACTOR when the average number of items per bucket | |
| 1320 * exceeds 2 ^ MHT_LOG_LOAD_FACTOR. | |
| 1321 */ | |
| 1322 #define MHT_LOG_LOAD_FACTOR 6 | |
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1323 #define MHT_GROWTH_FACTOR 2 // must be a power of two |
| 2730 | 1324 |
| 1325 /* | |
| 1326 * Initialize an empty hash table. | |
| 1327 */ | |
| 1328 static void | |
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1329 mf_hash_init(mf_hashtab_T *mht) |
| 2730 | 1330 { |
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1331 CLEAR_POINTER(mht); |
| 2730 | 1332 mht->mht_buckets = mht->mht_small_buckets; |
| 1333 mht->mht_mask = MHT_INIT_SIZE - 1; | |
| 1334 } | |
| 1335 | |
| 1336 /* | |
| 1337 * Free the array of a hash table. Does not free the items it contains! | |
| 1338 * The hash table must not be used again without another mf_hash_init() call. | |
| 1339 */ | |
| 1340 static void | |
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1341 mf_hash_free(mf_hashtab_T *mht) |
| 2730 | 1342 { |
| 1343 if (mht->mht_buckets != mht->mht_small_buckets) | |
| 1344 vim_free(mht->mht_buckets); | |
| 1345 } | |
| 1346 | |
| 1347 /* | |
| 1348 * Free the array of a hash table and all the items it contains. | |
| 1349 */ | |
| 1350 static void | |
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1351 mf_hash_free_all(mf_hashtab_T *mht) |
| 2730 | 1352 { |
| 1353 long_u idx; | |
| 1354 mf_hashitem_T *mhi; | |
| 1355 mf_hashitem_T *next; | |
| 1356 | |
| 1357 for (idx = 0; idx <= mht->mht_mask; idx++) | |
| 1358 for (mhi = mht->mht_buckets[idx]; mhi != NULL; mhi = next) | |
| 1359 { | |
| 1360 next = mhi->mhi_next; | |
| 1361 vim_free(mhi); | |
| 1362 } | |
| 1363 | |
| 1364 mf_hash_free(mht); | |
| 1365 } | |
| 1366 | |
| 1367 /* | |
| 1368 * Find "key" in hashtable "mht". | |
| 1369 * Returns a pointer to a mf_hashitem_T or NULL if the item was not found. | |
| 1370 */ | |
| 1371 static mf_hashitem_T * | |
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1372 mf_hash_find(mf_hashtab_T *mht, blocknr_T key) |
| 2730 | 1373 { |
| 1374 mf_hashitem_T *mhi; | |
| 1375 | |
| 1376 mhi = mht->mht_buckets[key & mht->mht_mask]; | |
| 1377 while (mhi != NULL && mhi->mhi_key != key) | |
| 1378 mhi = mhi->mhi_next; | |
| 1379 | |
| 1380 return mhi; | |
| 1381 } | |
| 1382 | |
| 1383 /* | |
| 1384 * Add item "mhi" to hashtable "mht". | |
| 1385 * "mhi" must not be NULL. | |
| 1386 */ | |
| 1387 static void | |
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1388 mf_hash_add_item(mf_hashtab_T *mht, mf_hashitem_T *mhi) |
| 2730 | 1389 { |
| 1390 long_u idx; | |
| 1391 | |
| 1392 idx = mhi->mhi_key & mht->mht_mask; | |
| 1393 mhi->mhi_next = mht->mht_buckets[idx]; | |
| 1394 mhi->mhi_prev = NULL; | |
| 1395 if (mhi->mhi_next != NULL) | |
| 1396 mhi->mhi_next->mhi_prev = mhi; | |
| 1397 mht->mht_buckets[idx] = mhi; | |
| 1398 | |
| 1399 mht->mht_count++; | |
| 1400 | |
| 1401 /* | |
| 1402 * Grow hashtable when we have more thank 2^MHT_LOG_LOAD_FACTOR | |
| 1403 * items per bucket on average | |
| 1404 */ | |
| 1405 if (mht->mht_fixed == 0 | |
| 1406 && (mht->mht_count >> MHT_LOG_LOAD_FACTOR) > mht->mht_mask) | |
| 1407 { | |
| 1408 if (mf_hash_grow(mht) == FAIL) | |
| 1409 { | |
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1410 // stop trying to grow after first failure to allocate memory |
| 2730 | 1411 mht->mht_fixed = 1; |
| 1412 } | |
| 1413 } | |
| 1414 } | |
| 1415 | |
| 1416 /* | |
| 1417 * Remove item "mhi" from hashtable "mht". | |
| 1418 * "mhi" must not be NULL and must have been inserted into "mht". | |
| 1419 */ | |
| 1420 static void | |
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1421 mf_hash_rem_item(mf_hashtab_T *mht, mf_hashitem_T *mhi) |
| 2730 | 1422 { |
| 1423 if (mhi->mhi_prev == NULL) | |
| 1424 mht->mht_buckets[mhi->mhi_key & mht->mht_mask] = mhi->mhi_next; | |
| 1425 else | |
| 1426 mhi->mhi_prev->mhi_next = mhi->mhi_next; | |
| 1427 | |
| 1428 if (mhi->mhi_next != NULL) | |
| 1429 mhi->mhi_next->mhi_prev = mhi->mhi_prev; | |
| 1430 | |
| 1431 mht->mht_count--; | |
| 1432 | |
|
18800
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patch 8.1.2388: using old C style comments
Bram Moolenaar <Bram@vim.org>
parents:
16825
diff
changeset
|
1433 // We could shrink the table here, but it typically takes little memory, |
|
f41b55f9357c
patch 8.1.2388: using old C style comments
Bram Moolenaar <Bram@vim.org>
parents:
16825
diff
changeset
|
1434 // so why bother? |
| 2730 | 1435 } |
| 1436 | |
| 1437 /* | |
| 1438 * Increase number of buckets in the hashtable by MHT_GROWTH_FACTOR and | |
| 1439 * rehash items. | |
| 1440 * Returns FAIL when out of memory. | |
| 1441 */ | |
| 1442 static int | |
|
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41789f16d6b2
commit https://github.com/vim/vim/commit/52ea13da0fe86df1abf34de52841e367035170c0
Christian Brabandt <cb@256bit.org>
parents:
7803
diff
changeset
|
1443 mf_hash_grow(mf_hashtab_T *mht) |
| 2730 | 1444 { |
| 1445 long_u i, j; | |
| 1446 int shift; | |
| 1447 mf_hashitem_T *mhi; | |
| 1448 mf_hashitem_T *tails[MHT_GROWTH_FACTOR]; | |
| 1449 mf_hashitem_T **buckets; | |
| 1450 size_t size; | |
| 1451 | |
| 1452 size = (mht->mht_mask + 1) * MHT_GROWTH_FACTOR * sizeof(void *); | |
|
16825
ce04ebdf26b8
patch 8.1.1414: alloc() returning "char_u *" causes a lot of type casts
Bram Moolenaar <Bram@vim.org>
parents:
16823
diff
changeset
|
1453 buckets = lalloc_clear(size, FALSE); |
| 2730 | 1454 if (buckets == NULL) |
| 1455 return FAIL; | |
| 1456 | |
| 1457 shift = 0; | |
| 1458 while ((mht->mht_mask >> shift) != 0) | |
| 1459 shift++; | |
| 1460 | |
| 1461 for (i = 0; i <= mht->mht_mask; i++) | |
| 1462 { | |
| 1463 /* | |
| 1464 * Traverse the items in the i-th original bucket and move them into | |
| 1465 * MHT_GROWTH_FACTOR new buckets, preserving their relative order | |
| 1466 * within each new bucket. Preserving the order is important because | |
| 1467 * mf_get() tries to keep most recently used items at the front of | |
| 1468 * each bucket. | |
| 1469 * | |
| 1470 * Here we strongly rely on the fact the hashes are computed modulo | |
| 1471 * a power of two. | |
| 1472 */ | |
| 1473 | |
|
20007
aadd1cae2ff5
patch 8.2.0559: clearing a struct is verbose
Bram Moolenaar <Bram@vim.org>
parents:
18800
diff
changeset
|
1474 CLEAR_FIELD(tails); |
| 2730 | 1475 |
| 1476 for (mhi = mht->mht_buckets[i]; mhi != NULL; mhi = mhi->mhi_next) | |
| 1477 { | |
| 1478 j = (mhi->mhi_key >> shift) & (MHT_GROWTH_FACTOR - 1); | |
| 1479 if (tails[j] == NULL) | |
| 1480 { | |
| 1481 buckets[i + (j << shift)] = mhi; | |
| 1482 tails[j] = mhi; | |
| 1483 mhi->mhi_prev = NULL; | |
| 1484 } | |
| 1485 else | |
| 1486 { | |
| 1487 tails[j]->mhi_next = mhi; | |
| 1488 mhi->mhi_prev = tails[j]; | |
| 1489 tails[j] = mhi; | |
| 1490 } | |
| 1491 } | |
| 1492 | |
| 1493 for (j = 0; j < MHT_GROWTH_FACTOR; j++) | |
| 1494 if (tails[j] != NULL) | |
| 1495 tails[j]->mhi_next = NULL; | |
| 1496 } | |
| 1497 | |
| 1498 if (mht->mht_buckets != mht->mht_small_buckets) | |
| 1499 vim_free(mht->mht_buckets); | |
| 1500 | |
| 1501 mht->mht_buckets = buckets; | |
| 1502 mht->mht_mask = (mht->mht_mask + 1) * MHT_GROWTH_FACTOR - 1; | |
| 1503 | |
| 1504 return OK; | |
| 1505 } |