Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 | /* * linux/fs/minix/fsync.c * * Copyright (C) 1993 Stephen Tweedie (sct@dcs.ed.ac.uk) * from * Copyright (C) 1991, 1992 Linus Torvalds * * Copyright (C) 1996 Gertjan van Wingerde (gertjan@cs.vu.nl) * Minix V2 fs support * * minix fsync primitive */ #include <linux/errno.h> #include <linux/sched.h> #include <linux/stat.h> #include <linux/fcntl.h> #include <linux/locks.h> #include <linux/fs.h> #include <linux/minix_fs.h> #include <asm/segment.h> #include <asm/system.h> #define blocksize BLOCK_SIZE /* * The functions for minix V1 fs file synchronization. */ static int V1_sync_block (struct inode * inode, unsigned short * block, int wait) { struct buffer_head * bh; unsigned short tmp; if (!*block) return 0; tmp = *block; bh = get_hash_table(inode->i_dev, *block, blocksize); if (!bh) return 0; if (*block != tmp) { brelse (bh); return 1; } if (wait && buffer_req(bh) && !buffer_uptodate(bh)) { brelse(bh); return -1; } if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh)) { brelse(bh); return 0; } ll_rw_block(WRITE, 1, &bh); bh->b_count--; return 0; } static int V1_sync_iblock (struct inode * inode, unsigned short * iblock, struct buffer_head **bh, int wait) { int rc; unsigned short tmp; *bh = NULL; tmp = *iblock; if (!tmp) return 0; rc = V1_sync_block (inode, iblock, wait); if (rc) return rc; *bh = bread(inode->i_dev, tmp, blocksize); if (tmp != *iblock) { brelse(*bh); *bh = NULL; return 1; } if (!*bh) return -1; return 0; } static int V1_sync_direct(struct inode *inode, int wait) { int i; int rc, err = 0; for (i = 0; i < 7; i++) { rc = V1_sync_block (inode, (unsigned short *) inode->u.minix_i.u.i1_data + i, wait); if (rc > 0) break; if (rc) err = rc; } return err; } static int V1_sync_indirect(struct inode *inode, unsigned short *iblock, int wait) { int i; struct buffer_head * ind_bh; int rc, err = 0; rc = V1_sync_iblock (inode, iblock, &ind_bh, wait); if (rc || !ind_bh) return rc; for (i = 0; i < 512; i++) { rc = V1_sync_block (inode, ((unsigned short *) ind_bh->b_data) + i, wait); if (rc > 0) break; if (rc) err = rc; } brelse(ind_bh); return err; } static int V1_sync_dindirect(struct inode *inode, unsigned short *diblock, int wait) { int i; struct buffer_head * dind_bh; int rc, err = 0; rc = V1_sync_iblock (inode, diblock, &dind_bh, wait); if (rc || !dind_bh) return rc; for (i = 0; i < 512; i++) { rc = V1_sync_indirect (inode, ((unsigned short *) dind_bh->b_data) + i, wait); if (rc > 0) break; if (rc) err = rc; } brelse(dind_bh); return err; } int V1_minix_sync_file(struct inode * inode, struct file * file) { int wait, err = 0; if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) return -EINVAL; for (wait=0; wait<=1; wait++) { err |= V1_sync_direct(inode, wait); err |= V1_sync_indirect(inode, inode->u.minix_i.u.i1_data + 7, wait); err |= V1_sync_dindirect(inode, inode->u.minix_i.u.i1_data + 8, wait); } err |= minix_sync_inode (inode); return (err < 0) ? -EIO : 0; } /* * The functions for minix V2 fs file synchronization. */ static int V2_sync_block (struct inode * inode, unsigned long * block, int wait) { struct buffer_head * bh; unsigned long tmp; if (!*block) return 0; tmp = *block; bh = get_hash_table(inode->i_dev, *block, blocksize); if (!bh) return 0; if (*block != tmp) { brelse (bh); return 1; } if (wait && buffer_req(bh) && !buffer_uptodate(bh)) { brelse(bh); return -1; } if (wait || !buffer_uptodate(bh) || !buffer_dirty(bh)) { brelse(bh); return 0; } ll_rw_block(WRITE, 1, &bh); bh->b_count--; return 0; } static int V2_sync_iblock (struct inode * inode, unsigned long * iblock, struct buffer_head **bh, int wait) { int rc; unsigned long tmp; *bh = NULL; tmp = *iblock; if (!tmp) return 0; rc = V2_sync_block (inode, iblock, wait); if (rc) return rc; *bh = bread(inode->i_dev, tmp, blocksize); if (tmp != *iblock) { brelse(*bh); *bh = NULL; return 1; } if (!*bh) return -1; return 0; } static int V2_sync_direct(struct inode *inode, int wait) { int i; int rc, err = 0; for (i = 0; i < 7; i++) { rc = V2_sync_block (inode, (unsigned long *)inode->u.minix_i.u.i2_data + i, wait); if (rc > 0) break; if (rc) err = rc; } return err; } static int V2_sync_indirect(struct inode *inode, unsigned long *iblock, int wait) { int i; struct buffer_head * ind_bh; int rc, err = 0; rc = V2_sync_iblock (inode, iblock, &ind_bh, wait); if (rc || !ind_bh) return rc; for (i = 0; i < 256; i++) { rc = V2_sync_block (inode, ((unsigned long *) ind_bh->b_data) + i, wait); if (rc > 0) break; if (rc) err = rc; } brelse(ind_bh); return err; } static int V2_sync_dindirect(struct inode *inode, unsigned long *diblock, int wait) { int i; struct buffer_head * dind_bh; int rc, err = 0; rc = V2_sync_iblock (inode, diblock, &dind_bh, wait); if (rc || !dind_bh) return rc; for (i = 0; i < 256; i++) { rc = V2_sync_indirect (inode, ((unsigned long *) dind_bh->b_data) + i, wait); if (rc > 0) break; if (rc) err = rc; } brelse(dind_bh); return err; } static int V2_sync_tindirect(struct inode *inode, unsigned long *tiblock, int wait) { int i; struct buffer_head * tind_bh; int rc, err = 0; rc = V2_sync_iblock (inode, tiblock, &tind_bh, wait); if (rc || !tind_bh) return rc; for (i = 0; i < 256; i++) { rc = V2_sync_dindirect (inode, ((unsigned long *) tind_bh->b_data) + i, wait); if (rc > 0) break; if (rc) err = rc; } brelse(tind_bh); return err; } int V2_minix_sync_file(struct inode * inode, struct file * file) { int wait, err = 0; if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) return -EINVAL; for (wait=0; wait<=1; wait++) { err |= V2_sync_direct(inode, wait); err |= V2_sync_indirect(inode, (unsigned long *) inode->u.minix_i.u.i2_data + 7, wait); err |= V2_sync_dindirect(inode, (unsigned long *) inode->u.minix_i.u.i2_data + 8, wait); err |= V2_sync_tindirect(inode, (unsigned long *) inode->u.minix_i.u.i2_data + 9, wait); } err |= minix_sync_inode (inode); return (err < 0) ? -EIO : 0; } /* * The function which is called for file synchronization. */ int minix_sync_file(struct inode * inode, struct file * file) { if (INODE_VERSION(inode) == MINIX_V1) return V1_minix_sync_file(inode, file); else return V2_minix_sync_file(inode, file); } |