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    SubjectRe: [patch 0/7] Add TRIM support for raid linear/0/1/10
    From
    2012/3/13 Holger Kiehl <Holger.Kiehl@dwd.de>:
    > On Tue, 13 Mar 2012, Shaohua Li wrote:
    >
    >> On 3/13/12 2:22 AM, Holger Kiehl wrote:
    >> > Hello,
    >> >
    >> > On Mon, 12 Mar 2012, Shaohua Li wrote:
    >> >
    >> >> The patches add TRIM support for raid linear/0/1/10. I'll add TRIM
    >> support for
    >> >> raid 4/5/6 later. The implementation is pretty straightforward and
    >> >> self-explained.
    >> >>
    >> > First, thanks for this patch!
    >> >
    >> > I have applied those patches against 3.3.0-rc7 and during boot the
    >> > kernel
    >> > reports a lot of the following:
    >> >
    >> > Mar 12 18:56:00 c3po kernel: [ 7.611045] md/raid0:md3: make_request bug:
    >> can't convert block across chunks or bigger than 512k 18861064 512
    >> > Mar 12 18:56:00 c3po kernel: [ 7.611047] md/raid0:md3: make_request bug:
    >> can't convert block across chunks or bigger than 512k 18862088 512
    >> > Mar 12 18:56:00 c3po kernel: [ 7.611049] md/raid0:md3: make_request bug:
    >> can't convert block across chunks or bigger than 512k 18863112 512
    >> > Mar 12 18:56:00 c3po kernel: [ 7.611052] md/raid0:md3: make_request bug:
    >> can't convert block across chunks or bigger than 512k 18864136 512
    >> > Mar 12 18:56:00 c3po kernel: [ 7.611054] md/raid0:md3: make_request bug:
    >> can't convert block across chunks or bigger than 512k 18865160 512
    >> > Mar 12 18:56:00 c3po kernel: [ 7.611056] md/raid0:md3: make_request bug:
    >> can't convert block across chunks or bigger than 512k 18866184 512
    >> Looks our SMTP server does something stupid. Sorry if you get two copies
    >> of the mail.
    >>
    >> Thanks for testing. Looks I fixed a sanity check in bio.c but there are
    >> similar check in raid0/10 which I forgot to fix. Below patch should fix
    >> it.
    >> please try.
    >>
    > Now I get following messages during boot (and it takes a very long time):
    >
    >   Mar 13 10:23:25 c3po kernel: [  251.355041]   bio ffff88019e0abc70,
    > biotail ffff88019e0ddc00, buffer           (null), len 0
    >   Mar 13 10:23:25 c3po kernel: [  251.355052] request botched: dev sdb:
    > type=1, flags=916c081
    >   Mar 13 10:23:25 c3po kernel: [  251.355054]   sector 52929353, nr/cnr 0/8
    >   Mar 13 10:23:25 c3po kernel: [  251.355055]   bio ffff88019e0aba70,
    > biotail ffff88019e0dda00, buffer           (null), len 0
    >   Mar 13 10:23:25 c3po kernel: [  251.355068] request botched: dev sdc:
    > type=1, flags=916c081
    >   Mar 13 10:23:25 c3po kernel: [  251.355069]   sector 52929346, nr/cnr
    > 0/1016
    >   Mar 13 10:23:25 c3po kernel: [  251.355071]   bio ffff88019e0aae00,
    > biotail ffff88019e0db380, buffer           (null), len 0
    >   Mar 13 10:23:25 c3po kernel: [  251.373583] request botched: dev sda:
    > type=1, flags=916c081
    >   Mar 13 10:23:25 c3po kernel: [  251.373585]   sector 52929354, nr/cnr
    > 0/1016
    >   Mar 13 10:23:25 c3po kernel: [  251.373587]   bio ffff88019e0aba00,
    > biotail ffff88019e0ddc00, buffer           (null), len 0
    >   Mar 13 10:23:25 c3po kernel: [  251.373597] request botched: dev sdb:
    > type=1, flags=916c081
    >   Mar 13 10:23:25 c3po kernel: [  251.373599]   sector 52929354, nr/cnr
    > 0/1016
    >   Mar 13 10:23:25 c3po kernel: [  251.373600]   bio ffff88019e0ab800,
    > biotail ffff88019e0dda00, buffer           (null), len 0
    >   Mar 13 10:23:25 c3po kernel: [  251.373612] request botched: dev sdc:
    > type=1, flags=916c081
    >   Mar 13 10:23:25 c3po kernel: [  251.373614]   sector 52929347, nr/cnr 0/8
    >   Mar 13 10:23:25 c3po kernel: [  251.373616]   bio ffff88019e0aaa70,
    > biotail ffff88019e0db380, buffer           (null), len 0
    >   Mar 13 10:23:25 c3po kernel: [  251.392135] request botched: dev sda:
    > type=1, flags=916c081
    >   Mar 13 10:23:25 c3po kernel: [  251.392137]   sector 52929355, nr/cnr 0/8
    >   Mar 13 10:23:25 c3po kernel: [  251.392139]   bio ffff88019e0ab670,
    > biotail ffff88019e0ddc00, buffer           (null), len 0
    >   Mar 13 10:23:25 c3po kernel: [  251.392150] request botched: dev sdb:
    > type=1, flags=916c081
    >   Mar 13 10:23:25 c3po kernel: [  251.392152]   sector 52929355, nr/cnr 0/8
    >   Mar 13 10:23:25 c3po kernel: [  251.392153]   bio ffff88019e0ab470,
    > biotail ffff88019e0dda00, buffer           (null), len 0
    >
    > After boot the system runs fine, but as soon as I do something (make clean
    > of
    > kernel tree with a sync) I get the same messages as above and it takes a
    > long time to sync:
    >
    >   Mar 13 10:44:59 c3po kernel: [ 1550.740528] request botched: dev sda:
    > type=1, flags=9164081
    >   Mar 13 10:44:59 c3po kernel: [ 1550.740533]   sector 12580617, nr/cnr
    > 0/776
    >   Mar 13 10:44:59 c3po kernel: [ 1550.740537]   bio ffff8801a362b670,
    > biotail ffff8801a30f3d80, buffer           (null), len 0
    >   Mar 13 10:44:59 c3po kernel: [ 1550.747141] request botched: dev sdb:
    > type=1, flags=9164081
    >   Mar 13 10:44:59 c3po kernel: [ 1550.747144]   sector 12579841, nr/cnr
    > 0/248
    >   Mar 13 10:44:59 c3po kernel: [ 1550.747148]   bio ffff88019e0dd200,
    > biotail ffff88019e0dd200, buffer           (null), len 0
    >   Mar 13 10:44:59 c3po kernel: [ 1550.749429] request botched: dev sdc:
    > type=1, flags=9164081
    >   Mar 13 10:44:59 c3po kernel: [ 1550.749432]   sector 12579841, nr/cnr
    > 0/248
    >   Mar 13 10:44:59 c3po kernel: [ 1550.749436]   bio ffff8801a362b600,
    > biotail ffff8801a362b600, buffer           (null), len 0
    >   Mar 13 10:44:59 c3po kernel: [ 1550.755332] request botched: dev sda:
    > type=1, flags=916c081
    >   Mar 13 10:44:59 c3po kernel: [ 1550.755335]   sector 12580618, nr/cnr
    > 0/248
    >   Mar 13 10:44:59 c3po kernel: [ 1550.755339]   bio ffff8801a30f3d80,
    > biotail ffff8801a30f3d80, buffer           (null), len 0
    >   Mar 13 10:44:59 c3po kernel: [ 1550.806832] request botched: dev sdb:
    > type=1, flags=9164081
    >   Mar 13 10:44:59 c3po kernel: [ 1550.806836]   sector 12266497, nr/cnr
    > 0/1000
    >   Mar 13 10:44:59 c3po kernel: [ 1550.806840]   bio ffff8801a4dca800,
    > biotail ffff88019e0c9000, buffer           (null), len 0
    >   Mar 13 10:44:59 c3po kernel: [ 1550.811972] request botched: dev sda:
    > type=1, flags=9164081
    >   Mar 13 10:44:59 c3po kernel: [ 1550.811976]   sector 12266497, nr/cnr
    > 0/1000
    >   Mar 13 10:44:59 c3po kernel: [ 1550.811979]   bio ffff88019e0dd200,
    > biotail ffff8801a3794000, buffer           (null), len 0
    >   Mar 13 10:44:59 c3po kernel: [ 1550.814081] request botched: dev sdc:
    > type=1, flags=9164081
    >   Mar 13 10:44:59 c3po kernel: [ 1550.814084]   sector 12265497, nr/cnr 0/24
    >   Mar 13 10:44:59 c3po kernel: [ 1550.814087]   bio ffff8801a4dca870,
    > biotail ffff8801a37f4080, buffer           (null), len 0
    >   Mar 13 10:44:59 c3po kernel: [ 1550.819150] request botched: dev sdc:
    > type=1, flags=916c081
    >   Mar 13 10:44:59 c3po kernel: [ 1550.819153]   sector 12265498, nr/cnr
    > 0/1000
    >
    > Please give me any hints what I can try next.
    Thanks for testing. This is very wield, the req->__data_len is wrong.
    Is this a clean build?
    didn't success to reproduce it, will check tomorrow again.

    Thanks,
    Shaohua
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