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Btrfs: Fix integer overflow when calculating bytes_per_bitmap 

On ppc64, bytes_per_bitmap will be (65536*8*65536). Hence append UL to
fix integer overflow.

Reviewed-by: Josef Bacik <jbacik@fb.com>
Reviewed-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
Signed-off-by: Feifei Xu <xufeifei@linux.vnet.ibm.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Feifei Xu 2016-06-01 19:18:24 +08:00 committed by David Sterba
parent 5473e0c426
commit 0ef6447a3d
2 changed files with 7 additions and 7 deletions
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12
fs/btrfs/free-space-cache.c
View File

@ -29,7 +29,7 @@
#include "inode-map.h"
#include "volumes.h"
#define BITS_PER_BITMAP (PAGE_SIZE * 8)
#define BITS_PER_BITMAP (PAGE_SIZE * 8UL)
#define MAX_CACHE_BYTES_PER_GIG SZ_32K
struct btrfs_trim_range {
@ -1415,11 +1415,11 @@ static inline u64 offset_to_bitmap(struct btrfs_free_space_ctl *ctl,
u64 offset)
{
u64 bitmap_start;
u32 bytes_per_bitmap;
u64 bytes_per_bitmap;
bytes_per_bitmap = BITS_PER_BITMAP * ctl->unit;
bitmap_start = offset - ctl->start;
bitmap_start = div_u64(bitmap_start, bytes_per_bitmap);
bitmap_start = div64_u64(bitmap_start, bytes_per_bitmap);
bitmap_start *= bytes_per_bitmap;
bitmap_start += ctl->start;
@ -1638,10 +1638,10 @@ static void recalculate_thresholds(struct btrfs_free_space_ctl *ctl)
u64 bitmap_bytes;
u64 extent_bytes;
u64 size = block_group->key.offset;
u32 bytes_per_bg = BITS_PER_BITMAP * ctl->unit;
u32 max_bitmaps = div_u64(size + bytes_per_bg - 1, bytes_per_bg);
u64 bytes_per_bg = BITS_PER_BITMAP * ctl->unit;
u64 max_bitmaps = div64_u64(size + bytes_per_bg - 1, bytes_per_bg);
max_bitmaps = max_t(u32, max_bitmaps, 1);
max_bitmaps = max_t(u64, max_bitmaps, 1);
ASSERT(ctl->total_bitmaps <= max_bitmaps);

2
fs/btrfs/tests/free-space-tests.c
View File

@ -22,7 +22,7 @@
#include "../disk-io.h"
#include "../free-space-cache.h"
#define BITS_PER_BITMAP (PAGE_SIZE * 8)
#define BITS_PER_BITMAP (PAGE_SIZE * 8UL)
/*
* This test just does basic sanity checking, making sure we can add an extent