UBIFS: use nicer 64-bit math
Instead of using do_div(), use better primitives from
linux/math64.h.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index a6a7798..c3cefc8 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -34,6 +34,7 @@
#include <linux/parser.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
+#include <linux/math64.h>
#include "ubifs.h"
/*
@@ -612,7 +613,7 @@
static int init_constants_late(struct ubifs_info *c)
{
int tmp, err;
- uint64_t tmp64;
+ long long tmp64;
c->main_bytes = (long long)c->main_lebs * c->leb_size;
c->max_znode_sz = sizeof(struct ubifs_znode) +
@@ -639,9 +640,8 @@
* Make sure that the log is large enough to fit reference nodes for
* all buds plus one reserved LEB.
*/
- tmp64 = c->max_bud_bytes;
- tmp = do_div(tmp64, c->leb_size);
- c->max_bud_cnt = tmp64 + !!tmp;
+ tmp64 = c->max_bud_bytes + c->leb_size - 1;
+ c->max_bud_cnt = div_u64(tmp64, c->leb_size);
tmp = (c->ref_node_alsz * c->max_bud_cnt + c->leb_size - 1);
tmp /= c->leb_size;
tmp += 1;
@@ -677,7 +677,7 @@
* Consequently, if the journal is too small, UBIFS will treat it as
* always full.
*/
- tmp64 = (uint64_t)(c->jhead_cnt + 1) * c->leb_size + 1;
+ tmp64 = (long long)(c->jhead_cnt + 1) * c->leb_size + 1;
if (c->bg_bud_bytes < tmp64)
c->bg_bud_bytes = tmp64;
if (c->max_bud_bytes < tmp64 + c->leb_size)
@@ -699,7 +699,7 @@
* head is available.
*/
tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1;
- tmp64 *= (uint64_t)c->leb_size - c->leb_overhead;
+ tmp64 *= (long long)c->leb_size - c->leb_overhead;
tmp64 = ubifs_reported_space(c, tmp64);
c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT;
