Bernhard Fischer

[rrdtool.git] / src / rrd_open.c

diff --git a/src/rrd_open.c b/src/rrd_open.c
index e182091..746044e 100644 (file)
--- a/src/rrd_open.c
+++ b/src/rrd_open.c
@@ -73,11 +73,14 @@
 //#define ONE_PAGE 1
 /* Avoid calling madvise on areas that were already hinted. May be benefical if
  * your syscalls are very slow */
-//#define CHECK_MADVISE_OVERLAPS 1
+#define CHECK_MADVISE_OVERLAPS 1
 
 #ifdef HAVE_MMAP
+/* 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) \
-       (dst) = (dst_t*) (data + offset); \
+       (dst) = (dst_t*)(void*) (data + offset); \
        offset += sizeof(dst_t) * (cnt)
 #else
 #define __rrd_read(dst, dst_t, cnt) \
@@ -196,7 +199,7 @@ rrd_file_t *rrd_open(
 
     if ((rrd_file->fd = open(file_name, flags, mode)) < 0) {
         rrd_set_error("opening '%s': %s", file_name, rrd_strerror(errno));
-        return NULL;
+        goto out_free;
     }
 
     /* Better try to avoid seeks as much as possible. stat may be heavy but
@@ -234,7 +237,7 @@ rrd_file_t *rrd_open(
 
     /* lets see if the first read worked */
     if (data == MAP_FAILED) {
-        rrd_set_error("error mmaping file '%s': %s", file_name,
+        rrd_set_error("mmaping file '%s': %s", file_name,
                       rrd_strerror(errno));
         goto out_close;
     }
@@ -246,24 +249,22 @@ rrd_file_t *rrd_open(
         _madvise(data, rrd_file->file_len, MADV_WILLNEED | MADV_SEQUENTIAL);
         goto out_done;
     }
+# ifndef ONE_PAGE
     /* We do not need to read anything in for the moment */
-#ifndef ONE_PAGE
     _madvise(data, rrd_file->file_len, MADV_DONTNEED);
-//    _madvise(data, rrd_file->file_len, MADV_RANDOM);
-#else
-/* alternatively: keep 2 pages worth of data, likely headers,
+# else
+/* alternatively: keep 1 page worth of data, likely headers,
  * don't need the rest.  */
     _madvise(data, _page_size, MADV_WILLNEED | MADV_SEQUENTIAL);
     _madvise(data + _page_size, (rrd_file->file_len >= _page_size)
              ? rrd_file->file_len - _page_size : 0, MADV_DONTNEED);
-#endif
+# endif
 #endif
 
 #if defined USE_MADVISE && !defined ONE_PAGE
     /* the stat_head will be needed soonish, so hint accordingly */
-// too finegrained to calc the individual sizes, just keep 2 pages worth of hdr
     _madvise(data + PAGE_ALIGN_DOWN(offset), PAGE_ALIGN(sizeof(stat_head_t)),
-             MADV_WILLNEED);
+             MADV_WILLNEED | MADV_RANDOM);
 
 #endif
 
@@ -277,7 +278,7 @@ rrd_file_t *rrd_open(
     }
 
     if (rrd->stat_head->float_cookie != FLOAT_COOKIE) {
-        rrd_set_error("This RRD was created on other architecture");
+        rrd_set_error("This RRD was created on another architecture");
         goto out_nullify_head;
     }
 
@@ -352,6 +353,8 @@ rrd_file_t *rrd_open(
     rrd->stat_head = NULL;
   out_close:
     close(rrd_file->fd);
+  out_free:
+    free(rrd_file);
     return NULL;
 }
 
@@ -400,19 +403,19 @@ int rrd_close(
 #endif                          /* DEBUG */
 
 #ifdef USE_MADVISE
-#ifdef ONE_PAGE
+# ifdef ONE_PAGE
     /* Keep headers around, round up to next page boundary.  */
     ret =
         PAGE_ALIGN(rrd_file->header_len % _page_size + rrd_file->header_len);
     if (rrd_file->file_len > ret)
         _madvise(rrd_file->file_start + ret,
                  rrd_file->file_len - ret, MADV_DONTNEED);
-#else
+# else
     /* ignoring errors from RRDs that are smaller then the file_len+rounding */
     _madvise(rrd_file->file_start + PAGE_ALIGN_DOWN(rrd_file->header_len),
              rrd_file->file_len - PAGE_ALIGN(rrd_file->header_len),
              MADV_DONTNEED);
-#endif
+# endif
 #endif
 #ifdef HAVE_MMAP
     ret = munmap(rrd_file->file_start, rrd_file->file_len);
@@ -457,7 +460,8 @@ off_t rrd_seek(
 
 /* Get current position in rrd_file.  */
 
-inline off_t rrd_tell(rrd_file_t *rrd_file)
+inline off_t rrd_tell(
+    rrd_file_t *rrd_file)
 {
     return rrd_file->pos;
 }
@@ -466,13 +470,13 @@ inline off_t rrd_tell(rrd_file_t *rrd_file)
 /* read count bytes into buffer buf, starting at rrd_file->pos.
  * Returns the number of bytes read.  */
 
-ssize_t rrd_read(
+inline ssize_t rrd_read(
     rrd_file_t *rrd_file,
     void *buf,
     size_t count)
 {
 #ifdef HAVE_MMAP
-    buf = memmove(buf, rrd_file->file_start + rrd_file->pos, count);
+    buf = memcpy(buf, rrd_file->file_start + rrd_file->pos, count);
     rrd_file->pos += count; /* mimmic read() semantics */
     return count;
 #else
@@ -490,16 +494,20 @@ ssize_t rrd_read(
  * rrd_file->pos of rrd_file->fd.
  * Returns the number of bytes written.  */
 
-ssize_t rrd_write(
+inline ssize_t rrd_write(
     rrd_file_t *rrd_file,
     const void *buf,
     size_t count)
 {
 #ifdef HAVE_MMAP
-    memmove(rrd_file->file_start + rrd_file->pos, buf, count);
+    memcpy(rrd_file->file_start + rrd_file->pos, buf, count);
+    rrd_file->pos += count;
     return count;       /* mimmic write() semantics */
 #else
-    return write(rrd_file->fd, buf, count);
+    ssize_t _sz = write(rrd_file->fd, buf, count);
+    if (_sz > 0)
+        rrd_file->pos += _sz;
+    return _sz;
 #endif
 }
 
@@ -536,7 +544,9 @@ void rrd_init(
 
 #ifdef HAVE_MMAP
 inline void rrd_free(
-    rrd_t UNUSED(*rrd)) {}
+    rrd_t UNUSED(*rrd))
+{
+}
 #else
 void rrd_free(
     rrd_t *rrd)