static void domapread(unsigned offset, unsigned size) { unsigned pg_offset; unsigned map_size; char *p; offset -= offset % readbdy; if (size == 0) { if (!quiet && testcalls > simulatedopcount) prt("skipping zero size read\n"); log4(OP_SKIPPED, OP_MAPREAD, offset, size); return; } if (size + offset > file_size) { if (!quiet && testcalls > simulatedopcount) prt("skipping seek/read past end of file\n"); log4(OP_SKIPPED, OP_MAPREAD, offset, size); return; } log4(OP_MAPREAD, offset, size, 0); if (testcalls <= simulatedopcount) return; if (!quiet && ((progressinterval && testcalls % progressinterval == 0) || (debug && (monitorstart == -1 || (offset + size > monitorstart && (monitorend == -1 || offset <= monitorend)))))) prt("%lu mapread\t0x%x thru\t0x%x\t(0x%x bytes)\n", testcalls, offset, offset + size - 1, size); pg_offset = offset & page_mask; map_size = pg_offset + size; if ((p = (char *)mmap(0, map_size, PROT_READ, MAP_FILE | MAP_SHARED, fd, (off_t)(offset - pg_offset))) == (char *)-1) { prterr("domapread: mmap"); report_failure(190); } if (setjmp(jmpbuf) == 0) { jmpbuf_good = 1; memcpy(temp_buf, p + pg_offset, size); check_eofpage("Read", offset, p, size); jmpbuf_good = 0; } else { report_failure(1901); } if (munmap(p, map_size) != 0) { prterr("domapread: munmap"); report_failure(191); } check_buffers(offset, size); }
void domapwrite(unsigned offset, unsigned size) { unsigned pg_offset; unsigned map_size; off_t cur_filesize; char *p; offset -= offset % writebdy; if (size == 0) { if (!quiet && testcalls > simulatedopcount) prt("skipping zero size write\n"); log4(OP_SKIPPED, OP_MAPWRITE, offset, size); return; } cur_filesize = file_size; log4(OP_MAPWRITE, offset, size, 0); gendata(original_buf, good_buf, offset, size); if (file_size < offset + size) { if (file_size < offset) memset(good_buf + file_size, '\0', offset - file_size); file_size = offset + size; if (lite) { warn("Lite file size bug in fsx!"); report_failure(200); } } if (testcalls <= simulatedopcount) return; if (!quiet && ((progressinterval && testcalls % progressinterval == 0) || (fsx_debug && (monitorstart == -1 || (offset + size > monitorstart && (monitorend == -1 || offset <= monitorend)))))) prt("%lu mapwrite\t0x%x thru\t0x%x\t(0x%x bytes)\n", testcalls, offset, offset + size - 1, size); if (file_size > cur_filesize) { if (ftruncate(fd, file_size) == -1) { prterr("domapwrite: ftruncate"); exit(201); } } pg_offset = offset & PAGE_MASK; map_size = pg_offset + size; if ((p = (char *)mmap(0, map_size, PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, fd, (off_t)(offset - pg_offset))) == (char *)-1) { prterr("domapwrite: mmap"); report_failure(202); } memcpy(p + pg_offset, good_buf + offset, size); if (msync(p, map_size, MS_SYNC) != 0) { prterr("domapwrite: msync"); report_failure(203); } check_eofpage("Write", offset, p, size); if (munmap(p, map_size) != 0) { prterr("domapwrite: munmap"); report_failure(204); } }