number of backup blocks evaluation is put in to function for code reuse.
Signed-off-by: Adam Kwolek <adam.kwolek@xxxxxxxxx>
---
Grow.c | 44 +++++++++++++++++++++++++++-----------------
mdadm.h | 4 +++-
2 files changed, 30 insertions(+), 18 deletions(-)
diff --git a/Grow.c b/Grow.c
index 8cba82b..8cc17d5 100644
--- a/Grow.c
+++ b/Grow.c
@@ -929,6 +929,31 @@ release:
return d;
}
+unsigned long compute_backup_blocks(int nchunk, int ochunk,
+ unsigned int ndata, unsigned int odata)
+{
+ unsigned long a, b, blocks;
+ /* So how much do we need to backup.
+ * We need an amount of data which is both a whole number of
+ * old stripes and a whole number of new stripes.
+ * So LCM for (chunksize*datadisks).
+ */
+ a = (ochunk/512) * odata;
+ b = (nchunk/512) * ndata;
+ /* Find GCD */
+ while (a != b) {
+ if (a < b)
+ b -= a;
+ if (b < a)
+ a -= b;
+ }
+ /* LCM == product / GCD */
+ blocks = (ochunk/512) * (nchunk/512) * odata * ndata / a;
+
+ return blocks;
+}
+
+
int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
long long size,
int level, char *layout_str, int chunksize, int raid_disks)
@@ -967,7 +992,7 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
int nrdisks;
int err;
int frozen;
- unsigned long a,b, blocks, stripes;
+ unsigned long blocks, stripes;
unsigned long cache;
unsigned long long array_size;
int changed = 0;
@@ -1587,22 +1612,7 @@ int Grow_reshape(char *devname, int fd, int quiet, char *backup_file,
break;
}
- /* So how much do we need to backup.
- * We need an amount of data which is both a whole number of
- * old stripes and a whole number of new stripes.
- * So LCM for (chunksize*datadisks).
- */
- a = (ochunk/512) * odata;
- b = (nchunk/512) * ndata;
- /* Find GCD */
- while (a != b) {
- if (a < b)
- b -= a;
- if (b < a)
- a -= b;
- }
- /* LCM == product / GCD */
- blocks = (ochunk/512) * (nchunk/512) * odata * ndata / a;
+ blocks = compute_backup_blocks(nchunk, ochunk, ndata, odata);
sysfs_free(sra);
sra = sysfs_read(fd, 0,
diff --git a/mdadm.h b/mdadm.h
index 698f1bf..06195c8 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -459,7 +459,8 @@ extern int reshape_prepare_fdlist(char *devname,
extern void reshape_free_fdlist(int **fdlist_in,
unsigned long long **offsets_in,
int size);
-
+extern unsigned long compute_backup_blocks(int nchunk, int ochunk,
+ unsigned int ndata, unsigned int odata);
extern int save_stripes(int *source, unsigned long long *offsets,
int raid_disks, int chunk_size, int level, int layout,
@@ -471,6 +472,7 @@ extern int restore_stripes(int *dest, unsigned long long *offsets,
int source, unsigned long long read_offset,
unsigned long long start, unsigned long long length);
+
#ifndef Sendmail
#define Sendmail "/usr/lib/sendmail -t"
#endif
--
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
