3.2.64-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Anton Altaparmakov <aia21@xxxxxxxxx>
commit f2d5a94436cc7cc0221b9a81bba2276a25187dd3 upstream.
On 32-bit architectures, the legacy buffer_head functions are not always
handling the sector number with the proper 64-bit types, and will thus
fail on 4TB+ disks.
Any code that uses __getblk() (and thus bread(), breadahead(),
sb_bread(), sb_breadahead(), sb_getblk()), and calls it using a 64-bit
block on a 32-bit arch (where "long" is 32-bit) causes an inifinite loop
in __getblk_slow() with an infinite stream of errors logged to dmesg
like this:
__find_get_block_slow() failed. block=6740375944, b_blocknr=2445408648
b_state=0x00000020, b_size=512
device sda1 blocksize: 512
Note how in hex block is 0x191C1F988 and b_blocknr is 0x91C1F988 i.e. the
top 32-bits are missing (in this case the 0x1 at the top).
This is because grow_dev_page() is broken and has a 32-bit overflow due
to shifting the page index value (a pgoff_t - which is just 32 bits on
32-bit architectures) left-shifted as the block number. But the top
bits to get lost as the pgoff_t is not type cast to sector_t / 64-bit
before the shift.
This patch fixes this issue by type casting "index" to sector_t before
doing the left shift.
Note this is not a theoretical bug but has been seen in the field on a
4TiB hard drive with logical sector size 512 bytes.
This patch has been verified to fix the infinite loop problem on 3.17-rc5
kernel using a 4TB disk image mounted using "-o loop". Without this patch
doing a "find /nt" where /nt is an NTFS volume causes the inifinite loop
100% reproducibly whilst with the patch it works fine as expected.
Signed-off-by: Anton Altaparmakov <aia21@xxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
fs/buffer.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1021,7 +1021,8 @@ grow_dev_page(struct block_device *bdev,
bh = page_buffers(page);
if (bh->b_size == size) {
end_block = init_page_buffers(page, bdev,
- index << sizebits, size);
+ (sector_t)index << sizebits,
+ size);
goto done;
}
if (!try_to_free_buffers(page))
@@ -1042,7 +1043,8 @@ grow_dev_page(struct block_device *bdev,
*/
spin_lock(&inode->i_mapping->private_lock);
link_dev_buffers(page, bh);
- end_block = init_page_buffers(page, bdev, index << sizebits, size);
+ end_block = init_page_buffers(page, bdev, (sector_t)index << sizebits,
+ size);
spin_unlock(&inode->i_mapping->private_lock);
done:
ret = (block < end_block) ? 1 : -ENXIO;
--
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