Mailing List Archive

[PATCH 5/7] btrfs: Promote to unsigned long long before shifting
On 32-bit systems, this shift will overflow for files larger than 4GB.

Cc: stable@vger.kernel.org
Fixes: df480633b891 ("btrfs: extent-tree: Switch to new delalloc space reserve and release")
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
fs/btrfs/ioctl.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index ac45f022b495..4d3b7e4ae53a 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1277,7 +1277,7 @@ static int cluster_pages_for_defrag(struct inode *inode,
page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);

ret = btrfs_delalloc_reserve_space(BTRFS_I(inode), &data_reserved,
- start_index << PAGE_SHIFT,
+ (loff_t)start_index << PAGE_SHIFT,
page_cnt << PAGE_SHIFT);
if (ret)
return ret;
@@ -1367,7 +1367,7 @@ static int cluster_pages_for_defrag(struct inode *inode,
btrfs_mod_outstanding_extents(BTRFS_I(inode), 1);
spin_unlock(&BTRFS_I(inode)->lock);
btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved,
- start_index << PAGE_SHIFT,
+ (loff_t)start_index << PAGE_SHIFT,
(page_cnt - i_done) << PAGE_SHIFT, true);
}

@@ -1395,7 +1395,7 @@ static int cluster_pages_for_defrag(struct inode *inode,
put_page(pages[i]);
}
btrfs_delalloc_release_space(BTRFS_I(inode), data_reserved,
- start_index << PAGE_SHIFT,
+ (loff_t)start_index << PAGE_SHIFT,
page_cnt << PAGE_SHIFT, true);
btrfs_delalloc_release_extents(BTRFS_I(inode), page_cnt << PAGE_SHIFT);
extent_changeset_free(data_reserved);
--
2.28.0
Re: [PATCH 5/7] btrfs: Promote to unsigned long long before shifting [ In reply to ]
On 10/4/20 2:04 PM, Matthew Wilcox (Oracle) wrote:
> On 32-bit systems, this shift will overflow for files larger than 4GB.
>
> Cc: stable@vger.kernel.org
> Fixes: df480633b891 ("btrfs: extent-tree: Switch to new delalloc space reserve and release")
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>

Reviewed-by: Josef Bacik <josef@toxicpanda.com>

Thanks,

Josef
Re: [PATCH 5/7] btrfs: Promote to unsigned long long before shifting [ In reply to ]
On Sun, Oct 04, 2020 at 07:04:26PM +0100, Matthew Wilcox (Oracle) wrote:
> On 32-bit systems, this shift will overflow for files larger than 4GB.
>
> Cc: stable@vger.kernel.org
> Fixes: df480633b891 ("btrfs: extent-tree: Switch to new delalloc space reserve and release")
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
> ---
> fs/btrfs/ioctl.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
> index ac45f022b495..4d3b7e4ae53a 100644
> --- a/fs/btrfs/ioctl.c
> +++ b/fs/btrfs/ioctl.c
> @@ -1277,7 +1277,7 @@ static int cluster_pages_for_defrag(struct inode *inode,
> page_cnt = min_t(u64, (u64)num_pages, (u64)file_end - start_index + 1);
>
> ret = btrfs_delalloc_reserve_space(BTRFS_I(inode), &data_reserved,
> - start_index << PAGE_SHIFT,
> + (loff_t)start_index << PAGE_SHIFT,

> - start_index << PAGE_SHIFT,
> + (loff_t)start_index << PAGE_SHIFT,

> - start_index << PAGE_SHIFT,
> + (loff_t)start_index << PAGE_SHIFT,

As this repeats 3 times I've added a variable. Patch added to misc-next,
thanks.