From: Erik Jensen <erikjensen@rkjnsn.net>
To: Qu Wenruo <quwenruo.btrfs@gmx.com>
Cc: Su Yue <l@damenly.su>, Hugo Mills <hugo@carfax.org.uk>,
linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: "bad tree block start" when trying to mount on ARM
Date: Wed, 17 Feb 2021 21:49:16 -0800 [thread overview]
Message-ID: <CAMj6ewOze4Ngw7ydj_Ry2nLeyvWs_dB=fuGJ2zBdCEepTiC6yA@mail.gmail.com> (raw)
In-Reply-To: <b06c1665-7547-2321-3863-4c68c9818f90@gmx.com>
On Wed, Feb 17, 2021 at 9:24 PM Qu Wenruo <quwenruo.btrfs@gmx.com> wrote:
> Got it now.
>
> [ 295.249182] read_extent_buffer_pages: eb->start=26207780683776 mirror=0
> [ 295.249188] __btrfs_map_block: logical=8615594639360 chunk
> start=8614760677376 len=4294967296 type=0x81
> [ 295.249189] __btrfs_map_block: stripe[0] devid=3 phy=2118735708160
>
> Note that, the initial request is to read from 26207780683776.
> But inside btrfs_map_block(), we want to read from 8615594639360.
>
> This is totally screwed up in a unexpected way.
>
> 26207780683776 = 0x17d5f9754000
> 8615594639360 = 0x07d5f9754000
>
> See the missing leading 1, which screws up the result.
>
> The problem should be the logical calculation part, which doesn't do
> proper u64 conversion which could cause the problem.
>
> Would you like to test the single line fix below?
>
> Thanks,
> Qu
>
> diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
> index b8fab44394f5..69d728f5ff9e 100644
> --- a/fs/btrfs/volumes.c
> +++ b/fs/btrfs/volumes.c
> @@ -6575,7 +6575,7 @@ blk_status_t btrfs_map_bio(struct btrfs_fs_info
> *fs_info, struct bio *bio,
> {
> struct btrfs_device *dev;
> struct bio *first_bio = bio;
> - u64 logical = bio->bi_iter.bi_sector << 9;
> + u64 logical = ((u64)bio->bi_iter.bi_sector) << 9;
> u64 length = 0;
> u64 map_length;
> int ret;
So… it appears my kernel tree (Arch32's 5.10.14-arch1) already has that:
blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
int mirror_num)
{
struct btrfs_device *dev;
struct bio *first_bio = bio;
u64 logical = (u64)bio->bi_iter.bi_sector << 9;
u64 length = 0;
u64 map_length;
int ret;
int dev_nr;
int total_devs;
struct btrfs_bio *bbio = NULL;
next prev parent reply other threads:[~2021-02-18 5:54 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-21 8:34 "bad tree block start" when trying to mount on ARM Erik Jensen
2019-05-21 8:56 ` Patrik Lundquist
2019-05-21 9:01 ` Erik Jensen
2019-05-21 9:18 ` Hugo Mills
2019-05-22 16:02 ` Erik Jensen
2019-06-26 7:04 ` Erik Jensen
2019-06-26 8:10 ` Qu Wenruo
[not found] ` <CAMj6ewO229vq6=s+T7GhUegwDADv4dzhqPiM0jo10QiKujvytA@mail.gmail.com>
2019-06-28 8:15 ` Qu Wenruo
2021-01-18 10:50 ` Erik Jensen
[not found] ` <CAMj6ewMqXLtrBQgTJuz04v3MBZ0W95fU4pT0jP6kFhuP830TuA@mail.gmail.com>
2021-01-18 11:07 ` Qu Wenruo
2021-01-18 11:55 ` Erik Jensen
2021-01-18 12:01 ` Qu Wenruo
2021-01-18 12:12 ` Erik Jensen
2021-01-19 5:22 ` Erik Jensen
2021-01-19 9:28 ` Erik Jensen
2021-01-20 8:21 ` Qu Wenruo
2021-01-20 8:30 ` Qu Wenruo
[not found] ` <CAMj6ewOqCJTGjykDijun9_LWYELA=92HrE+KjGo-ehJTutR_+w@mail.gmail.com>
2021-01-26 4:54 ` Erik Jensen
2021-01-29 6:39 ` Erik Jensen
2021-02-01 2:35 ` Qu Wenruo
2021-02-01 5:49 ` Su Yue
2021-02-04 6:16 ` Erik Jensen
2021-02-06 1:57 ` Erik Jensen
2021-02-10 5:47 ` Qu Wenruo
2021-02-10 22:17 ` Erik Jensen
2021-02-10 23:47 ` Qu Wenruo
2021-02-18 1:24 ` Qu Wenruo
2021-02-18 4:03 ` Erik Jensen
2021-02-18 5:24 ` Qu Wenruo
2021-02-18 5:49 ` Erik Jensen [this message]
2021-02-18 6:09 ` Qu Wenruo
2021-02-18 6:59 ` Erik Jensen
2021-02-18 7:24 ` Qu Wenruo
2021-02-18 7:59 ` Erik Jensen
2021-02-18 8:38 ` Qu Wenruo
2021-02-18 8:52 ` Erik Jensen
2021-02-18 8:59 ` Qu Wenruo
2021-02-20 2:47 ` Erik Jensen
2021-02-20 3:16 ` Qu Wenruo
2021-02-20 4:28 ` Erik Jensen
2021-02-20 6:01 ` Qu Wenruo
2021-02-21 5:36 ` Erik Jensen
2021-02-18 7:25 ` Erik Jensen
2019-05-21 10:17 ` Qu Wenruo
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