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Message-ID: <4783D4E2.5080801@redhat.com>
Date: Tue, 08 Jan 2008 13:54:10 -0600
From: Eric Sandeen <sandeen@...hat.com>
To: Eric Sandeen <sandeen@...hat.com>,
ext4 development <linux-ext4@...r.kernel.org>,
Alex Tomas <alex@...sterfs.com>
Subject: [PATCH] UPDATED3: types fixup for mballoc
4th time's the charm?
Note, the calculations Andreas & I were discussing only work properly
for stripe <= blocks per group... I don't know if we'd need to enforce
that at mount time?
-------------
I ran into a potential overflow in ext4_mb_scan_aligned,
and went looking for others in mballoc. This patch hits a
few spots, compile-tested only at this point, comments welcome.
This patch:
changes fe_len to an int, I don't think we need it to be a long,
looking at how it's used (should it be a grpblk_t?) Also change
anything assigned to return value of mb_find_extent, since it returns
fe_len.
changes anything that does groupno * EXT4_BLOCKS_PER_GROUP
or pa->pa_pstart + <whatever> to an ext4_fsblk_t
avoids 64-bit divides & modulos, and...
fixes up any related formats
Signed-off-by: Eric Sandeen <sandeen@...hat.com>
---
Index: linux-2.6.24-rc3/fs/ext4/mballoc.c
===================================================================
--- linux-2.6.24-rc3.orig/fs/ext4/mballoc.c
+++ linux-2.6.24-rc3/fs/ext4/mballoc.c
@@ -363,7 +363,7 @@ struct ext4_free_extent {
ext4_lblk_t fe_logical;
ext4_grpblk_t fe_start;
ext4_group_t fe_group;
- unsigned long fe_len;
+ int fe_len;
};
/*
@@ -586,14 +586,14 @@ static void mb_free_blocks_double(struct
BUG_ON(!ext4_is_group_locked(sb, e4b->bd_group));
for (i = 0; i < count; i++) {
if (!mb_test_bit(first + i, e4b->bd_info->bb_bitmap)) {
- unsigned long blocknr;
+ ext4_fsblk_t blocknr;
blocknr = e4b->bd_group * EXT4_BLOCKS_PER_GROUP(sb);
blocknr += first + i;
blocknr +=
le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
ext4_error(sb, __FUNCTION__, "double-free of inode"
- " %lu's block %lu(bit %u in group %lu)\n",
+ " %lu's block %llu(bit %u in group %lu)\n",
inode ? inode->i_ino : 0, blocknr,
first + i, e4b->bd_group);
}
@@ -1226,14 +1226,14 @@ static int mb_free_blocks(struct inode *
order = 0;
if (!mb_test_bit(block, EXT4_MB_BITMAP(e4b))) {
- unsigned long blocknr;
+ ext4_fsblk_t blocknr;
blocknr = e4b->bd_group * EXT4_BLOCKS_PER_GROUP(sb);
blocknr += block;
blocknr +=
le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
ext4_error(sb, __FUNCTION__, "double-free of inode"
- " %lu's block %lu(bit %u in group %lu)\n",
+ " %lu's block %llu(bit %u in group %lu)\n",
inode ? inode->i_ino : 0, blocknr, block,
e4b->bd_group);
}
@@ -1416,7 +1416,7 @@ static void ext4_mb_use_best_found(struc
struct ext4_buddy *e4b)
{
struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb);
- unsigned long ret;
+ int ret;
BUG_ON(ac->ac_b_ex.fe_group != e4b->bd_group);
BUG_ON(ac->ac_status == AC_STATUS_FOUND);
@@ -1609,10 +1609,12 @@ static int ext4_mb_find_by_goal(struct e
ac->ac_g_ex.fe_len, &ex);
if (max >= ac->ac_g_ex.fe_len && ac->ac_g_ex.fe_len == sbi->s_stripe) {
- unsigned long start;
- start = (e4b->bd_group * EXT4_BLOCKS_PER_GROUP(ac->ac_sb) +
- ex.fe_start + le32_to_cpu(es->s_first_data_block));
- if (start % sbi->s_stripe == 0) {
+ ext4_fsblk_t start;
+
+ start = (e4b->bd_group * EXT4_BLOCKS_PER_GROUP(ac->ac_sb)) +
+ ex.fe_start + le32_to_cpu(es->s_first_data_block);
+ /* use do_div to get remainder (would be 64-bit modulo) */
+ if (do_div(start, sbi->s_stripe) == 0) {
ac->ac_found++;
ac->ac_b_ex = ex;
ext4_mb_use_best_found(ac, e4b);
@@ -1724,6 +1726,7 @@ static void ext4_mb_complex_scan_group(s
/*
* This is a special case for storages like raid5
* we try to find stripe-aligned chunks for stripe-size requests
+ * XXX should do so at least for multiples of stripe size as well
*/
static void ext4_mb_scan_aligned(struct ext4_allocation_context *ac,
struct ext4_buddy *e4b)
@@ -1732,17 +1735,19 @@ static void ext4_mb_scan_aligned(struct
struct ext4_sb_info *sbi = EXT4_SB(sb);
void *bitmap = EXT4_MB_BITMAP(e4b);
struct ext4_free_extent ex;
- unsigned long i;
- unsigned long max;
+ ext4_fsblk_t first_group_block;
+ ext4_fsblk_t a;
+ ext4_grpblk_t i;
+ int max;
BUG_ON(sbi->s_stripe == 0);
- /* find first stripe-aligned block */
- i = e4b->bd_group * EXT4_BLOCKS_PER_GROUP(sb)
+ /* find first stripe-aligned block in group */
+ first_group_block = e4b->bd_group * EXT4_BLOCKS_PER_GROUP(sb)
+ le32_to_cpu(sbi->s_es->s_first_data_block);
- i = ((i + sbi->s_stripe - 1) / sbi->s_stripe) * sbi->s_stripe;
- i = (i - le32_to_cpu(sbi->s_es->s_first_data_block))
- % EXT4_BLOCKS_PER_GROUP(sb);
+ a = first_group_block + sbi->s_stripe - 1;
+ do_div(a, sbi->s_stripe);
+ i = (a * sbi->s_stripe) - first_group_block;
while (i < sb->s_blocksize * 8) {
if (!mb_test_bit(i, bitmap)) {
@@ -2026,35 +2031,35 @@ static int ext4_mb_seq_history_show(stru
if (hs->op == EXT4_MB_HISTORY_ALLOC) {
fmt = "%-5u %-8u %-23s %-23s %-23s %-5u %-5u %-2u "
"%-5u %-5s %-5u %-6u\n";
- sprintf(buf2, "%lu/%d/%lu@%lu", hs->result.fe_group,
+ sprintf(buf2, "%lu/%d/%u@%u", hs->result.fe_group,
hs->result.fe_start, hs->result.fe_len,
- (unsigned long)hs->result.fe_logical);
- sprintf(buf, "%lu/%d/%lu@%lu", hs->orig.fe_group,
+ hs->result.fe_logical);
+ sprintf(buf, "%lu/%d/%u@%u", hs->orig.fe_group,
hs->orig.fe_start, hs->orig.fe_len,
- (unsigned long)hs->orig.fe_logical);
- sprintf(buf3, "%lu/%d/%lu@%lu", hs->goal.fe_group,
+ hs->orig.fe_logical);
+ sprintf(buf3, "%lu/%d/%u@%u", hs->goal.fe_group,
hs->goal.fe_start, hs->goal.fe_len,
- (unsigned long)hs->goal.fe_logical);
+ hs->goal.fe_logical);
seq_printf(seq, fmt, hs->pid, hs->ino, buf, buf3, buf2,
hs->found, hs->groups, hs->cr, hs->flags,
hs->merged ? "M" : "", hs->tail,
hs->buddy ? 1 << hs->buddy : 0);
} else if (hs->op == EXT4_MB_HISTORY_PREALLOC) {
fmt = "%-5u %-8u %-23s %-23s %-23s\n";
- sprintf(buf2, "%lu/%d/%lu@%lu", hs->result.fe_group,
+ sprintf(buf2, "%lu/%d/%u@%u", hs->result.fe_group,
hs->result.fe_start, hs->result.fe_len,
- (unsigned long)hs->result.fe_logical);
- sprintf(buf, "%lu/%d/%lu@%lu", hs->orig.fe_group,
+ hs->result.fe_logical);
+ sprintf(buf, "%lu/%d/%u@%u", hs->orig.fe_group,
hs->orig.fe_start, hs->orig.fe_len,
- (unsigned long)hs->orig.fe_logical);
+ hs->orig.fe_logical);
seq_printf(seq, fmt, hs->pid, hs->ino, buf, "", buf2);
} else if (hs->op == EXT4_MB_HISTORY_DISCARD) {
- sprintf(buf2, "%lu/%d/%lu", hs->result.fe_group,
+ sprintf(buf2, "%lu/%d/%u", hs->result.fe_group,
hs->result.fe_start, hs->result.fe_len);
seq_printf(seq, "%-5u %-8u %-23s discard\n",
hs->pid, hs->ino, buf2);
} else if (hs->op == EXT4_MB_HISTORY_FREE) {
- sprintf(buf2, "%lu/%d/%lu", hs->result.fe_group,
+ sprintf(buf2, "%lu/%d/%u", hs->result.fe_group,
hs->result.fe_start, hs->result.fe_len);
seq_printf(seq, "%-5u %-8u %-23s free\n",
hs->pid, hs->ino, buf2);
@@ -2943,7 +2948,7 @@ static int ext4_mb_mark_diskspace_used(s
struct buffer_head *gdp_bh;
struct ext4_sb_info *sbi;
struct super_block *sb;
- sector_t block;
+ ext4_fsblk_t block;
int err;
BUG_ON(ac->ac_status != AC_STATUS_FOUND);
@@ -2984,8 +2989,8 @@ static int ext4_mb_mark_diskspace_used(s
EXT4_SB(sb)->s_itb_per_group)) {
ext4_error(sb, __FUNCTION__,
- "Allocating block in system zone - block = %lu",
- (unsigned long) block);
+ "Allocating block in system zone - block = %llu",
+ block);
}
#ifdef AGGRESSIVE_CHECK
{
@@ -3250,12 +3255,13 @@ static void ext4_mb_use_inode_pa(struct
struct ext4_prealloc_space *pa)
{
ext4_fsblk_t start;
- unsigned long len;
+ ext4_fsblk_t end;
+ int len;
/* found preallocated blocks, use them */
start = pa->pa_pstart + (ac->ac_o_ex.fe_logical - pa->pa_lstart);
- len = min(pa->pa_pstart + pa->pa_len, start + ac->ac_o_ex.fe_len);
- len = len - start;
+ end = min(pa->pa_pstart + pa->pa_len, start + ac->ac_o_ex.fe_len);
+ len = end - start;
ext4_get_group_no_and_offset(ac->ac_sb, start, &ac->ac_b_ex.fe_group,
&ac->ac_b_ex.fe_start);
ac->ac_b_ex.fe_len = len;
@@ -3952,8 +3958,8 @@ static void ext4_mb_show_ac(struct ext4_
printk(KERN_ERR "EXT4-fs: can't allocate: status %d flags %d\n",
ac->ac_status, ac->ac_flags);
- printk(KERN_ERR "EXT4-fs: orig %lu/%lu/%lu@%lu, goal %lu/%lu/%lu@%lu, "
- "best %lu/%lu/%lu@%lu cr %d\n",
+ printk(KERN_ERR "EXT4-fs: orig %lu/%lu/%u@%u, goal %lu/%lu/%u@%u, "
+ "best %lu/%lu/%u@%u cr %d\n",
ac->ac_o_ex.fe_group, ac->ac_o_ex.fe_start,
ac->ac_o_ex.fe_len, ac->ac_o_ex.fe_logical,
ac->ac_g_ex.fe_group, ac->ac_g_ex.fe_start,
-
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