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/budget.c b/fs/ubifs/budget.c
index e423425..0bcb803 100644
--- a/fs/ubifs/budget.c
+++ b/fs/ubifs/budget.c
@@ -32,7 +32,7 @@
#include "ubifs.h"
#include <linux/writeback.h>
-#include <asm/div64.h>
+#include <linux/math64.h>
/*
* When pessimistic budget calculations say that there is no enough space,
@@ -258,8 +258,8 @@
*/
int ubifs_calc_min_idx_lebs(struct ubifs_info *c)
{
- int ret;
- uint64_t idx_size;
+ int idx_lebs, eff_leb_size = c->leb_size - c->max_idx_node_sz;
+ long long idx_size;
idx_size = c->old_idx_sz + c->budg_idx_growth + c->budg_uncommitted_idx;
@@ -271,18 +271,16 @@
* pair, nor similarly the two variables for the new index size, so we
* have to do this costly 64-bit division on fast-path.
*/
- if (do_div(idx_size, c->leb_size - c->max_idx_node_sz))
- ret = idx_size + 1;
- else
- ret = idx_size;
+ idx_size += eff_leb_size - 1;
+ idx_lebs = div_u64(idx_size, eff_leb_size);
/*
* The index head is not available for the in-the-gaps method, so add an
* extra LEB to compensate.
*/
- ret += 1;
- if (ret < MIN_INDEX_LEBS)
- ret = MIN_INDEX_LEBS;
- return ret;
+ idx_lebs += 1;
+ if (idx_lebs < MIN_INDEX_LEBS)
+ idx_lebs = MIN_INDEX_LEBS;
+ return idx_lebs;
}
/**
@@ -718,7 +716,7 @@
* Note, the calculation is pessimistic, which means that most of the time
* UBIFS reports less space than it actually has.
*/
-long long ubifs_reported_space(const struct ubifs_info *c, uint64_t free)
+long long ubifs_reported_space(const struct ubifs_info *c, long long free)
{
int divisor, factor, f;
@@ -740,8 +738,7 @@
divisor = UBIFS_MAX_DATA_NODE_SZ;
divisor += (c->max_idx_node_sz * 3) / (f - 1);
free *= factor;
- do_div(free, divisor);
- return free;
+ return div_u64(free, divisor);
}
/**
diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c
index 6ecb01a..a2be115 100644
--- a/fs/ubifs/debug.c
+++ b/fs/ubifs/debug.c
@@ -33,6 +33,7 @@
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/debugfs.h>
+#include <linux/math64.h>
#ifdef CONFIG_UBIFS_FS_DEBUG
diff --git a/fs/ubifs/lpt.c b/fs/ubifs/lpt.c
index 6d91416..b2792e8 100644
--- a/fs/ubifs/lpt.c
+++ b/fs/ubifs/lpt.c
@@ -43,8 +43,9 @@
* mounted.
*/
-#include <linux/crc16.h>
#include "ubifs.h"
+#include <linux/crc16.h>
+#include <linux/math64.h>
/**
* do_calc_lpt_geom - calculate sizes for the LPT area.
@@ -135,15 +136,13 @@
int ubifs_calc_lpt_geom(struct ubifs_info *c)
{
int lebs_needed;
- uint64_t sz;
+ long long sz;
do_calc_lpt_geom(c);
/* Verify that lpt_lebs is big enough */
sz = c->lpt_sz * 2; /* Must have at least 2 times the size */
- sz += c->leb_size - 1;
- do_div(sz, c->leb_size);
- lebs_needed = sz;
+ lebs_needed = div_u64(sz + c->leb_size - 1, c->leb_size);
if (lebs_needed > c->lpt_lebs) {
ubifs_err("too few LPT LEBs");
return -EINVAL;
@@ -175,7 +174,7 @@
int *big_lpt)
{
int i, lebs_needed;
- uint64_t sz;
+ long long sz;
/* Start by assuming the minimum number of LPT LEBs */
c->lpt_lebs = UBIFS_MIN_LPT_LEBS;
@@ -202,9 +201,7 @@
/* Now check there are enough LPT LEBs */
for (i = 0; i < 64 ; i++) {
sz = c->lpt_sz * 4; /* Allow 4 times the size */
- sz += c->leb_size - 1;
- do_div(sz, c->leb_size);
- lebs_needed = sz;
+ lebs_needed = div_u64(sz + c->leb_size - 1, c->leb_size);
if (lebs_needed > c->lpt_lebs) {
/* Not enough LPT LEBs so try again with more */
c->lpt_lebs = lebs_needed;
diff --git a/fs/ubifs/sb.c b/fs/ubifs/sb.c
index c5da201..e070c64 100644
--- a/fs/ubifs/sb.c
+++ b/fs/ubifs/sb.c
@@ -28,6 +28,7 @@
#include "ubifs.h"
#include <linux/random.h>
+#include <linux/math64.h>
/*
* Default journal size in logical eraseblocks as a percent of total
@@ -80,7 +81,7 @@
int err, tmp, jnl_lebs, log_lebs, max_buds, main_lebs, main_first;
int lpt_lebs, lpt_first, orph_lebs, big_lpt, ino_waste, sup_flags = 0;
int min_leb_cnt = UBIFS_MIN_LEB_CNT;
- uint64_t tmp64, main_bytes;
+ long long tmp64, main_bytes;
__le64 tmp_le64;
/* Some functions called from here depend on the @c->key_len filed */
@@ -160,7 +161,7 @@
if (!sup)
return -ENOMEM;
- tmp64 = (uint64_t)max_buds * c->leb_size;
+ tmp64 = (long long)max_buds * c->leb_size;
if (big_lpt)
sup_flags |= UBIFS_FLG_BIGLPT;
@@ -187,9 +188,8 @@
generate_random_uuid(sup->uuid);
- main_bytes = (uint64_t)main_lebs * c->leb_size;
- tmp64 = main_bytes * DEFAULT_RP_PERCENT;
- do_div(tmp64, 100);
+ main_bytes = (long long)main_lebs * c->leb_size;
+ tmp64 = div_u64(main_bytes * DEFAULT_RP_PERCENT, 100);
if (tmp64 > DEFAULT_MAX_RP_SIZE)
tmp64 = DEFAULT_MAX_RP_SIZE;
sup->rp_size = cpu_to_le64(tmp64);
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;
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index 543e850..a17dd79 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -1498,7 +1498,7 @@
long long ubifs_get_free_space(struct ubifs_info *c);
int ubifs_calc_min_idx_lebs(struct ubifs_info *c);
void ubifs_convert_page_budget(struct ubifs_info *c);
-long long ubifs_reported_space(const struct ubifs_info *c, uint64_t free);
+long long ubifs_reported_space(const struct ubifs_info *c, long long free);
long long ubifs_calc_available(const struct ubifs_info *c, int min_idx_lebs);
/* find.c */