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Subject: Re: [PATCH v26 00/10] NTFS read-write driver GPL implementation by
 Paragon Software
To:     Konstantin Komarov <almaz.alexandrovich@paragon-software.com>,
        linux-fsdevel@vger.kernel.org
Cc:     viro@zeniv.linux.org.uk, linux-kernel@vger.kernel.org,
        pali@kernel.org, dsterba@suse.cz, aaptel@suse.com,
        willy@infradead.org, rdunlap@infradead.org, joe@perches.com,
        mark@harmstone.com, nborisov@suse.com,
        linux-ntfs-dev@lists.sourceforge.net, anton@tuxera.com,
        dan.carpenter@oracle.com, hch@lst.de, ebiggers@kernel.org,
        andy.lavr@gmail.com, kari.argillander@gmail.com,
        oleksandr@natalenko.name
References: <20210402155347.64594-1-almaz.alexandrovich@paragon-software.com>
From:   Yan Pas <yanp.bugz@gmail.com>
Message-ID: <cc64ac69-f4e5-3fc4-1362-ced7cf68119a@gmail.com>
Date:   Sun, 25 Jul 2021 20:02:18 +0300
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Hi everyone!

I'm regular Arch-linux user and have been using your driver for a while
(https://aur.archlinux.org/packages/ntfs3-dkms/). There are a lot of
users who tested this patch and some of them, like me, have complaints.

I faced stalling of a kthread with some ntfs functions in a stacktrace
while rsyncing one NTFS partition (SATA) to another (USB HDD)
(https://aur.archlinux.org/packages/ntfs3-dkms/#comment-818819):

[ 5529.507567] INFO: task kworker/0:1:18 blocked for more than 1105 seconds.
[ 5529.507580]       Tainted: P           OE     5.13.4-arch1-1 #1
[ 5529.507584] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 5529.507586] task:kworker/0:1     state:D stack:    0 pid:   18
ppid:     2 flags:0x00004000
[ 5529.507598] Workqueue: usb_hub_wq hub_event
[ 5529.507612] Call Trace:
[ 5529.507615]  ? out_of_line_wait_on_bit_lock+0xb0/0xb0
[ 5529.507631]  __schedule+0x310/0x930
[ 5529.507641]  ? out_of_line_wait_on_bit_lock+0xb0/0xb0
[ 5529.507648]  schedule+0x5b/0xc0
[ 5529.507654]  bit_wait+0xd/0x60
[ 5529.507661]  __wait_on_bit+0x2a/0x90
[ 5529.507669]  __inode_wait_for_writeback+0xb0/0xe0
[ 5529.507680]  ? var_wake_function+0x20/0x20
[ 5529.507689]  writeback_single_inode+0x64/0x140
[ 5529.507699]  sync_inode_metadata+0x3d/0x60
[ 5529.507712]  ntfs_set_state+0x126/0x1a0 [ntfs3]
[ 5529.507738]  ni_write_inode+0x244/0xef0 [ntfs3]
[ 5529.507764]  ? pagevec_lookup_range_tag+0x24/0x30
[ 5529.507772]  ? __filemap_fdatawait_range+0x6f/0xf0
[ 5529.507785]  __writeback_single_inode+0x260/0x310
[ 5529.507795]  writeback_single_inode+0xa7/0x140
[ 5529.507803]  sync_inode_metadata+0x3d/0x60
[ 5529.507814]  ntfs_set_state+0x126/0x1a0 [ntfs3]
[ 5529.507834]  ntfs_sync_fs+0xf9/0x100 [ntfs3]
[ 5529.507857]  sync_filesystem+0x40/0x90
[ 5529.507868]  fsync_bdev+0x21/0x60
[ 5529.507874]  delete_partition+0x13/0x80
[ 5529.507882]  blk_drop_partitions+0x5b/0xa0
[ 5529.507889]  del_gendisk+0xa5/0x220

...


Also adding ntfs3 partition (1.4TB) to fstab makes booting much slower:
I see two lines in console (systemd version and some other line) and HDD
led constantly flickering (seems like ntfs3 is traversing entire
partition)
(https://aur.archlinux.org/pkgbase/ntfs3-dkms/edit-comment/?comment_id=818673).

Regards, Yan.