From fd541595aa5d0c19281fda76907847a93f2cfaec Mon Sep 17 00:00:00 2001
From: oetiker <oetiker@a5681a0c-68f1-0310-ab6d-d61299d08faa>
Date: Fri, 1 Jun 2007 19:11:49 +0000
Subject: [PATCH] Bernhard: - implement resize SHRINK for FD (mmap is to be
 done) - indent

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk/program@1100 a5681a0c-68f1-0310-ab6d-d61299d08faa
---
 src/rrd_open.c   | 27 ++++++++++++++-------------
 src/rrd_resize.c | 26 +++++++++++++++-----------
 2 files changed, 29 insertions(+), 24 deletions(-)

diff --git a/src/rrd_open.c b/src/rrd_open.c
index e839184..6e8a042 100644
--- a/src/rrd_open.c
+++ b/src/rrd_open.c
@@ -145,8 +145,10 @@ rrd_file_t *rrd_open(
     rrd_file_t *rrd_file = NULL;
     off_t     newfile_size = 0;
 
-    if (rdwr & RRD_CREAT)
-        newfile_size = (off_t) rrd->stat_head;
+    if (rdwr & RRD_CREAT) {
+        newfile_size = (off_t) rrd->stat_head->float_cookie;
+        free(rrd->stat_head);
+    }
     rrd_init(rrd);
     rrd_file = malloc(sizeof(rrd_file_t));
     if (rrd_file == NULL) {
@@ -189,7 +191,6 @@ rrd_file_t *rrd_open(
         mm_flags |= MAP_POPULATE;   /* populate ptes and data */
 #endif
 #if defined MAP_NONBLOCK
-//  if (!(rdwr & RRD_COPY))
         mm_flags |= MAP_NONBLOCK;   /* just populate ptes */
 #endif
 #ifdef USE_DIRECT_IO
@@ -217,7 +218,7 @@ rrd_file_t *rrd_open(
     } else {
         rrd_file->file_len = newfile_size;
         lseek(rrd_file->fd, newfile_size - 1, SEEK_SET);
-        write(rrd_file->fd, "\0", 1);  /* poke */
+        write(rrd_file->fd, "\0", 1);   /* poke */
         lseek(rrd_file->fd, 0, SEEK_SET);
     }
 #ifdef HAVE_POSIX_FADVISE
@@ -257,6 +258,8 @@ rrd_file_t *rrd_open(
         goto out_done;
     }
 #endif
+    if (rdwr & RRD_CREAT)
+        goto out_done;
 #ifdef USE_MADVISE
     if (rdwr & RRD_COPY) {
         /* We will read everything in a moment (copying) */
@@ -356,9 +359,7 @@ rrd_file_t *rrd_open(
 
     rrd_file->header_len = offset;
     rrd_file->pos = offset;
-#ifdef USE_MADVISE
   out_done:
-#endif
     return (rrd_file);
   out_nullify_head:
     rrd->stat_head = NULL;
@@ -487,23 +488,24 @@ inline ssize_t rrd_read(
     size_t count)
 {
 #ifdef HAVE_MMAP
-    size_t _cnt = count;
-    ssize_t _surplus = rrd_file->pos + _cnt - rrd_file->file_len;
+    size_t    _cnt = count;
+    ssize_t   _surplus = rrd_file->pos + _cnt - rrd_file->file_len;
+
     if (_surplus > 0) { /* short read */
         _cnt -= _surplus;
     }
     if (_cnt == 0)
-        return 0; /* EOF */
+        return 0;       /* EOF */
     buf = memcpy(buf, rrd_file->file_start + rrd_file->pos, _cnt);
 
-    rrd_file->pos += _cnt; /* mimmic read() semantics */
+    rrd_file->pos += _cnt;  /* mimmic read() semantics */
     return _cnt;
 #else
     ssize_t   ret;
 
     ret = read(rrd_file->fd, buf, count);
     if (ret > 0)
-        rrd_file->pos += ret; /* mimmic read() semantics */
+        rrd_file->pos += ret;   /* mimmic read() semantics */
     return ret;
 #endif
 }
@@ -571,8 +573,7 @@ inline void rrd_free(
 void rrd_free(
     rrd_t *rrd)
 {
-    if (atoi(rrd->stat_head->version) < 3)
-        free(rrd->live_head);
+    free(rrd->live_head);
     free(rrd->stat_head);
     free(rrd->ds_def);
     free(rrd->rra_def);
diff --git a/src/rrd_resize.c b/src/rrd_resize.c
index b242b48..9dcfcca 100644
--- a/src/rrd_resize.c
+++ b/src/rrd_resize.c
@@ -74,18 +74,22 @@ int rrd_resize(
         return (-1);
     }
 
-    if (modify < 0) {
+    if (modify < 0)
         if ((long) rrdold.rra_def[target_rra].row_cnt <= -modify) {
             rrd_set_error("This RRA is not that big");
             rrd_free(&rrdold);
             rrd_close(rrd_file);
             return (-1);
         }
-    } else {
-        /* the size of the new file */
-        rrdnew.stat_head = rrd_file->file_len +
-            (rrdold.stat_head->ds_cnt * sizeof(rrd_value_t) * modify);
+    /* the size of the new file */
+    if ((rrdnew.stat_head = calloc(1, sizeof(stat_head_t))) == NULL) {
+        rrd_set_error("allocating stat_head for new RRD");
+        rrd_free(&rrdold);
+        rrd_close(rrd_file);
+        return (-1);
     }
+    rrdnew.stat_head->float_cookie = rrd_file->file_len +
+        (rrdold.stat_head->ds_cnt * sizeof(rrd_value_t) * modify);
     rrd_out_file = rrd_open(outfilename, &rrdnew, RRD_READWRITE | RRD_CREAT);
     if (rrd_out_file == NULL) {
         rrd_set_error("Can't create '%s': %s", outfilename,
@@ -162,8 +166,8 @@ int rrd_resize(
         /* Adding extra rows; insert unknown values just after the
          ** current row number.
          */
-        l = rrdnew.stat_head->ds_cnt * (rrdnew.rra_ptr[target_rra].cur_row +
-                                        1);
+        l = rrdnew.stat_head->ds_cnt *
+            (rrdnew.rra_ptr[target_rra].cur_row + 1);
         while (l > 0) {
             rrd_read(rrd_file, &buffer, sizeof(rrd_value_t) * 1);
             rrd_write(rrd_out_file, &buffer, sizeof(rrd_value_t) * 1);
@@ -177,8 +181,8 @@ int rrd_resize(
             l--;
         }
 #else
-	/* for the mmap case, we did already fill the whole new file with DNAN
-	 * before we copied the old values, so nothing to do here.  */
+        /* for the mmap case, we did already fill the whole new file with DNAN
+         * before we copied the old values, so nothing to do here.  */
 #endif
     } else {
         /* Removing rows. Normally this would be just after the cursor
@@ -212,7 +216,8 @@ int rrd_resize(
             }
         }
         while (modify < 0) {
-            rrd_seek(rrd_file, sizeof(rrd_value_t) * rrdnew.stat_head->ds_cnt,
+            rrd_seek(rrd_file,
+                     sizeof(rrd_value_t) * rrdnew.stat_head->ds_cnt,
                      SEEK_CUR);
             rrdnew.rra_def[target_rra].row_cnt--;
             modify++;
@@ -243,7 +248,6 @@ int rrd_resize(
     rrd_free(&rrdold);
     rrd_close(rrd_file);
 
-    rrd_free(&rrdnew);
     rrd_close(rrd_out_file);
 
     return (0);
-- 
2.11.0