X-Git-Url: https://git.octo.it/?p=rrdtool.git;a=blobdiff_plain;f=src%2Frrd_open.c;h=6b2d6ac00cec1f6abbdbc06ce2bce894af7e24e7;hp=e92ae5d1b89f7abecf7b25ebd078f29cabe6ce97;hb=9e6dd6a7c7768d90a8f62d7379d3dfa361e3ad7f;hpb=46d2e915a9f864304ee107f9ea35a60b01d3e378 diff --git a/src/rrd_open.c b/src/rrd_open.c index e92ae5d..6b2d6ac 100644 --- a/src/rrd_open.c +++ b/src/rrd_open.c @@ -1,5 +1,5 @@ /***************************************************************************** - * RRDtool 1.3rc7 Copyright by Tobi Oetiker, 1997-2008 + * RRDtool 1.3.2 Copyright by Tobi Oetiker, 1997-2008 ***************************************************************************** * rrd_open.c Open an RRD File ***************************************************************************** @@ -21,25 +21,43 @@ /* the cast to void* is there to avoid this warning seen on ia64 with certain versions of gcc: 'cast increases required alignment of target type' */ -#define __rrd_read(dst, dst_t, cnt) \ +#define __rrd_read(dst, dst_t, cnt) { \ + size_t wanted = sizeof(dst_t)*(cnt); \ + if (offset + wanted > rrd_file->file_len) { \ + rrd_set_error("reached EOF while loading header " #dst); \ + goto out_nullify_head; \ + } \ (dst) = (dst_t*)(void*) (data + offset); \ - offset += sizeof(dst_t) * (cnt) + offset += wanted; \ + } #else -#define __rrd_read(dst, dst_t, cnt) \ - if ((dst = malloc(sizeof(dst_t)*(cnt))) == NULL) { \ +#define __rrd_read(dst, dst_t, cnt) { \ + size_t wanted = sizeof(dst_t)*(cnt); \ + size_t got; \ + if ((dst = malloc(wanted)) == NULL) { \ rrd_set_error(#dst " malloc"); \ goto out_nullify_head; \ } \ - offset += read (rrd_file->fd, dst, sizeof(dst_t)*(cnt)) + got = read (rrd_file->fd, dst, wanted); \ + if (got != wanted) { \ + rrd_set_error("short read while reading header " #dst); \ + goto out_nullify_head; \ + } \ + offset += got; \ + } #endif /* get the address of the start of this page */ -#if defined USE_MADVISE || defined HAVE_POSIX_FADVISE +#if defined USE_MADVISE || defined HAVE_POSIX_FADVISE #ifndef PAGE_START #define PAGE_START(addr) ((addr)&(~(_page_size-1))) #endif #endif +long int rra_random_row( + rra_def_t *); + + /* Open a database file, return its header and an open filehandle, * positioned to the first cdp in the first rra. * In the error path of rrd_open, only rrd_free(&rrd) has to be called @@ -58,20 +76,21 @@ rrd_file_t *rrd_open( #ifdef HAVE_MMAP ssize_t _page_size = sysconf(_SC_PAGESIZE); int mm_prot = PROT_READ, mm_flags = 0; - char *data; + char *data = MAP_FAILED; #endif off_t offset = 0; struct stat statb; rrd_file_t *rrd_file = NULL; off_t newfile_size = 0; - if (rdwr & RRD_CREAT) { + if ((rdwr & RRD_CREAT) && (rdwr & RRD_CREAT_SETSIZE)) { /* yes bad inline signaling alert, we are using the floatcookie to pass the size in ... only used in resize */ newfile_size = (off_t) rrd->stat_head->float_cookie; free(rrd->stat_head); } - rrd_init(rrd); + if(!(rdwr & RRD_CREAT)) + rrd_init(rrd); rrd_file = malloc(sizeof(rrd_file_t)); if (rrd_file == NULL) { rrd_set_error("allocating rrd_file descriptor for '%s'", file_name); @@ -116,6 +135,9 @@ rrd_file_t *rrd_open( mm_flags |= MAP_NONBLOCK; /* just populate ptes */ #endif } +#if defined(_WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__) + flags |= O_BINARY; +#endif if ((rrd_file->fd = open(file_name, flags, mode)) < 0) { rrd_set_error("opening '%s': %s", file_name, rrd_strerror(errno)); @@ -153,7 +175,13 @@ rrd_file_t *rrd_open( } } */ + #ifdef HAVE_MMAP + if(rrd_file->file_len == 0 && (rdwr & RRD_CREAT)) + { + rrd_file->file_start = NULL; + goto out_done; + } data = mmap(0, rrd_file->file_len, mm_prot, mm_flags, rrd_file->fd, offset); @@ -254,11 +282,34 @@ rrd_file_t *rrd_open( rrd_file->header_len = offset; rrd_file->pos = offset; + + { + unsigned long row_cnt = 0; + unsigned long i; + + for (i=0; istat_head->rra_cnt; i++) + row_cnt += rrd->rra_def[i].row_cnt; + + off_t correct_len = rrd_file->header_len + + sizeof(rrd_value_t) * row_cnt * rrd->stat_head->ds_cnt; + + if (correct_len > rrd_file->file_len) + { + rrd_set_error("'%s' is too small (should be %ld bytes)", + file_name, (long long) correct_len); + goto out_nullify_head; + } + } + out_done: return (rrd_file); out_nullify_head: rrd->stat_head = NULL; out_close: +#ifdef HAVE_MMAP + if (data != MAP_FAILED) + munmap(data, rrd_file->file_len); +#endif close(rrd_file->fd); out_free: free(rrd_file); @@ -318,12 +369,19 @@ void rrd_dontneed( rrd_t *rrd) { #if defined USE_MADVISE || defined HAVE_POSIX_FADVISE - unsigned long dontneed_start; - unsigned long rra_start; - unsigned long active_block; + off_t dontneed_start; + off_t rra_start; + off_t active_block; unsigned long i; ssize_t _page_size = sysconf(_SC_PAGESIZE); + if (rrd_file == NULL) { +#if defined DEBUG && DEBUG + fprintf (stderr, "rrd_dontneed: Argument 'rrd_file' is NULL.\n"); +#endif + return; + } + #if defined DEBUG && DEBUG > 1 mincore_print(rrd_file, "before"); #endif @@ -360,18 +418,23 @@ void rrd_dontneed( rrd->rra_def[i].row_cnt * rrd->stat_head->ds_cnt * sizeof(rrd_value_t); } + + if (dontneed_start < rrd_file->file_len) { #ifdef USE_MADVISE - madvise(rrd_file->file_start + dontneed_start, - rrd_file->file_len - dontneed_start, MADV_DONTNEED); + madvise(rrd_file->file_start + dontneed_start, + rrd_file->file_len - dontneed_start, MADV_DONTNEED); #endif #ifdef HAVE_POSIX_FADVISE - posix_fadvise(rrd_file->fd, dontneed_start, - rrd_file->file_len - dontneed_start, POSIX_FADV_DONTNEED); + posix_fadvise(rrd_file->fd, dontneed_start, + rrd_file->file_len - dontneed_start, + POSIX_FADV_DONTNEED); #endif + } + #if defined DEBUG && DEBUG > 1 mincore_print(rrd_file, "after"); #endif -#endif /* without madvise and posix_fadvise ist does not make much sense todo anything */ +#endif /* without madvise and posix_fadvise ist does not make much sense todo anything */ } @@ -429,7 +492,7 @@ off_t rrd_seek( /* Get current position in rrd_file. */ -inline off_t rrd_tell( +off_t rrd_tell( rrd_file_t *rrd_file) { return rrd_file->pos; @@ -439,7 +502,7 @@ inline off_t rrd_tell( /* Read count bytes into buffer buf, starting at rrd_file->pos. * Returns the number of bytes read or <0 on error. */ -inline ssize_t rrd_read( +ssize_t rrd_read( rrd_file_t *rrd_file, void *buf, size_t count) @@ -477,16 +540,42 @@ inline ssize_t rrd_read( * rrd_file->pos of rrd_file->fd. * Returns the number of bytes written or <0 on error. */ -inline ssize_t rrd_write( +ssize_t rrd_write( rrd_file_t *rrd_file, const void *buf, size_t count) { #ifdef HAVE_MMAP + /* These flags are used if creating a new RRD */ + int mm_prot = PROT_READ | PROT_WRITE, mm_flags = MAP_SHARED; + int old_size = rrd_file->file_len; + int new_size = rrd_file->file_len; if (count == 0) return 0; if (buf == NULL) return -1; /* EINVAL */ + + if((rrd_file->pos + count) > old_size) + { + new_size = rrd_file->pos + count; + rrd_file->file_len = new_size; + lseek(rrd_file->fd, new_size - 1, SEEK_SET); + write(rrd_file->fd, "\0", 1); /* poke */ + lseek(rrd_file->fd, 0, SEEK_SET); + if(rrd_file->file_start == NULL) + { + rrd_file->file_start = mmap(0, new_size, mm_prot, mm_flags, + rrd_file->fd, 0); + } + else + rrd_file->file_start = mremap(rrd_file->file_start, old_size, new_size, MREMAP_MAYMOVE); + + if (rrd_file->file_start == MAP_FAILED) { + rrd_set_error("m(re)maping file : %s", + rrd_strerror(errno)); + return -1; + } + } memcpy(rrd_file->file_start + rrd_file->pos, buf, count); rrd_file->pos += count; return count; /* mimmic write() semantics */ @@ -502,7 +591,7 @@ inline ssize_t rrd_write( /* flush all data pending to be written to FD. */ -inline void rrd_flush( +void rrd_flush( rrd_file_t *rrd_file) { if (fdatasync(rrd_file->fd) != 0) { @@ -564,63 +653,45 @@ void rrd_freemem( free(mem); } +/* + * rra_update informs us about the RRAs being updated + * The low level storage API may use this information for + * aligning RRAs within stripes, or other performance enhancements + */ +void rrd_notify_row( + rrd_file_t *rrd_file, + int rra_idx, + unsigned long rra_row, + time_t rra_time) +{ +} -/* XXX: FIXME: missing documentation. */ -/*XXX: FIXME should be renamed to rrd_readfile or _rrd_readfile */ - -int /*_rrd_*/ readfile( - const char *file_name, - char **buffer, - int skipfirst) +/* + * This function is called when creating a new RRD + * The storage implementation can use this opportunity to select + * a sensible starting row within the file. + * The default implementation is random, to ensure that all RRAs + * don't change to a new disk block at the same time + */ +unsigned long rrd_select_initial_row( + rrd_file_t *rrd_file, + int rra_idx, + rra_def_t *rra + ) { - long writecnt = 0, totalcnt = MEMBLK; - long offset = 0; - FILE *input = NULL; - char c; + return rra_random_row(rra); +} - if ((strcmp("-", file_name) == 0)) { - input = stdin; - } else { - if ((input = fopen(file_name, "rb")) == NULL) { - rrd_set_error("opening '%s': %s", file_name, rrd_strerror(errno)); - return (-1); - } - } - if (skipfirst) { - do { - c = getc(input); - offset++; - } while (c != '\n' && !feof(input)); - } - if (strcmp("-", file_name)) { - fseek(input, 0, SEEK_END); - /* have extra space for detecting EOF without realloc */ - totalcnt = (ftell(input) + 1) / sizeof(char) - offset; - if (totalcnt < MEMBLK) - totalcnt = MEMBLK; /* sanitize */ - fseek(input, offset * sizeof(char), SEEK_SET); +static int rand_init = 0; + +long int rra_random_row( + rra_def_t *rra) +{ + if (!rand_init) { + srandom((unsigned int) time(NULL) + (unsigned int) getpid()); + rand_init++; } - if (((*buffer) = (char *) malloc((totalcnt + 4) * sizeof(char))) == NULL) { - perror("Allocate Buffer:"); - exit(1); - }; - do { - writecnt += - fread((*buffer) + writecnt, 1, - (totalcnt - writecnt) * sizeof(char), input); - if (writecnt >= totalcnt) { - totalcnt += MEMBLK; - if (((*buffer) = - rrd_realloc((*buffer), - (totalcnt + 4) * sizeof(char))) == NULL) { - perror("Realloc Buffer:"); - exit(1); - }; - } - } while (!feof(input)); - (*buffer)[writecnt] = '\0'; - if (strcmp("-", file_name) != 0) { - fclose(input); - }; - return writecnt; + + return random() % rra->row_cnt; } +