From: Paolo Minazzi on
I have tried this patch.
I have enabled LOGFS, but not mounted partition with it.
/dev/mtdblock1 is my romfs root partition and it is OK.

The problem is that init cannot mount my /dev/mtdblock1 romfs root.

This is the fault :
Platform: Cirrus Logic EDB9315A Board (ARM920T) Rev A
Copyright (C) 2000, 2001, 2002, Red Hat, Inc.
|----------------------------------------------
Raw file loaded 0x00080000-0x001dce6b, assumed entry at
0x00080000-----------------------------------------------------------
RedBoot> exec -s 0x00b00000 -r 0x00a00000 -c "root=/dev/mtdblock1
console=ttyAM console=tty1"--------------------------------
ENTRY=0xc0008000-------------------------------------------------------------------------------------------------------------
LENGTH=0x00300000------------------------------------------------------------------------------------------------------------
BASE_ADDR=0x00080000---------------------------------------------------------------------------------------------------------
Using base address 0x00080000 and length
0x00300000--------------------------------------------------------------------------
Uncompressing Linux... done, booting the kernel.
Linux version 2.6.34-rc5 (root(a)darkstar) (gcc version 3.4.3) #18 Tue
Apr 27 10:55:55 CEST 2010
CPU: ARM920T [41129200] revision 0 (ARMv4T), cr=c0007177
CPU: VIVT data cache, VIVT instruction cache
Machine: Cirrus Logic EDB9315A Evaluation Board
Memory policy: ECC disabled, Data cache writeback
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 32512
Kernel command line: root=/dev/mtdblock1 console=ttyAM console=tty1
PID hash table entries: 512 (order: -1, 2048 bytes)
Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
Memory: 128MB = 128MB total
Memory: 126928k/126928k available, 4144k reserved, 0K highmem
Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
DMA : 0xffc00000 - 0xffe00000 ( 2 MB)
vmalloc : 0xc8800000 - 0xfe800000 ( 864 MB)
lowmem : 0xc0000000 - 0xc8000000 ( 128 MB)
modules : 0xbf000000 - 0xc0000000 ( 16 MB)
.init : 0xc0008000 - 0xc0036000 ( 184 kB)
.text : 0xc0036000 - 0xc02ab000 (2516 kB)
.data : 0xc02ac000 - 0xc02c4e00 ( 100 kB)
SLUB: Genslabs=11, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
Hierarchical RCU implementation.
NR_IRQS:120
VIC @fefb0000: id 0x00041190, vendor 0x41
VIC @fefc0000: id 0x00041190, vendor 0x41
Console: colour dummy device 80x30
console [tty1] enabled
Calibrating delay loop... 99.73 BogoMIPS (lpj=498688)
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
NET: Registered protocol family 16
ep93xx clock: PLL1 running at 200 MHz, PLL2 at 48 MHz
ep93xx clock: FCLK 200 MHz, HCLK 100 MHz, PCLK 50 MHz
ep93xx dma_m2p: M2P DMA subsystem initialized
bio: create slab <bio-0> at 0
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 4096 (order: 3, 32768 bytes)
TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
TCP: Hash tables configured (established 4096 bind 4096)
TCP reno registered
UDP hash table entries: 256 (order: 0, 4096 bytes)
UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
NET: Registered protocol family 1
JFFS2 version 2.2. (NAND) © 2001-2006 Red Hat, Inc.
***REGISTER LOGFS
***REGISTER LOGFS DONE ret=0
ROMFS MTD (C) 2007 Red Hat, Inc.
msgmni has been set to 247
io scheduler noop registered
io scheduler deadline registered
io scheduler cfq registered (default)
Console: switching to colour frame buffer device 100x37
graphics fb0: registered. Mode = 800x600-16
Serial: AMBA driver
apb:uart1: ttyAM0 at MMIO 0x808c0000 (irq = 52) is a AMBA
console [ttyAM0] enabled
apb:uart2: ttyAM1 at MMIO 0x808d0000 (irq = 54) is a AMBA
apb:uart3: ttyAM2 at MMIO 0x808e0000 (irq = 55) is a AMBA
dev->num_resources=1
physmap platform flash device: 02000000 at 60000000
physmap-flash.0: Found 1 x16 devices at 0x0 in 16-bit bank
physmap-flash.0: Found 1 x16 devices at 0x1000000 in 16-bit bank
Intel/Sharp Extended Query Table at 0x0031
Intel/Sharp Extended Query Table at 0x0031
Using buffer write method
cfi_cmdset_0001: Erase suspend on write enabled
cmdlinepart partition parsing not available
Searching for RedBoot partition table in physmap-flash.0 at offset 0x1fe0000
6 RedBoot partitions found on MTD device physmap-flash.0
Creating 6 MTD partitions on "physmap-flash.0":
0x000000000000-0x000000040000 : "RedBoot"
0x000000040000-0x000000b40000 : "ramdisk"
0x000000b40000-0x000000e40000 : "zImage"
0x000000e40000-0x000001fc0000 : "jffs2"
0x000001fc0000-0x000001fe0000 : "RedBoot config"
0x000001fe0000-0x000002000000 : "FIS directory"
PPP generic driver version 2.4.2
PPP Deflate Compression module registered
PPP BSD Compression module registered
ep93xx-eth version 0.1 loading
eth0: ep93xx on-chip ethernet, IRQ 39, 00:00:11:22:33:36
ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
ep93xx-ohci ep93xx-ohci: EP93xx OHCI
ep93xx-ohci ep93xx-ohci: new USB bus registered, assigned bus number 1
ep93xx-ohci ep93xx-ohci: irq 56, io mem 0x80020000
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 3 ports detected
usbcore: registered new interface driver cdc_acm
cdc_acm: v0.26:USB Abstract Control Model driver for USB modems and
ISDN adapters
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
ep93xx-rtc ep93xx-rtc: rtc core: registered ep93xx-rtc as rtc0
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
TCP cubic registered
NET: Registered protocol family 17
Last power-down at UTC 08:47:16 on 27/04/2010
ep93xx-rtc ep93xx-rtc: setting system clock to 2010-04-27 08:47:16 UTC
(1272358036)
VFS: Cannot open root device "mtdblock1" or unknown-block(31,1)
Please append a correct "root=" boot option; here are the available partitions:
1f00 256 mtdblock0 (driver?)
1f01 11264 mtdblock1 (driver?)
1f02 3072 mtdblock2 (driver?)
1f03 17920 mtdblock3 (driver?)
1f04 128 mtdblock4 (driver?)
1f05 128 mtdblock5 (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,1)
Backtrace:
[<c003a3dc>] (dump_backtrace+0x0/0x12c) from [<c003a520>] (dump_stack+0x18/0x1c)
r7:c7c11000 r6:fffffffb r5:c7c11000 r4:00000000
[<c003a508>] (dump_stack+0x0/0x1c) from [<c0046628>] (panic+0x3c/0xc4)
[<c00465ec>] (panic+0x0/0xc4) from [<c0008d58>] (mount_block_root+0x110/0x2e8)
r3:00000000 r2:20000013 r1:c7c27f58 r0:c0276b44
[<c0008c48>] (mount_block_root+0x0/0x2e8) from [<c0008f84>]
(mount_root+0x54/0x6c)
[<c0008f30>] (mount_root+0x0/0x6c) from [<c0009094>]
(prepare_namespace+0xf8/0x194)
r5:c001a56c r4:c001a570
[<c0008f9c>] (prepare_namespace+0x0/0x194) from [<c0008aa4>]
(kernel_init+0x114/0x15c)
r6:c0019b0c r5:c0019d5c r4:c02c4e18
[<c0008990>] (kernel_init+0x0/0x15c) from [<c0048e98>] (do_exit+0x0/0x628)
r6:00000000 r5:00000000 r4:00000000



If I disable logfs, my root /dev/mtdblock1 is mounted correclty.

Any ideas ?

Paolo









On Mon, Apr 26, 2010 at 6:31 PM, J�rn Engel <joern(a)logfs.org> wrote:
> Otherwise we hit a BUG_ON in bdi_queue_work().
>
> Signed-off-by: Joern Engel <joern(a)logfs.org>
> ---
> �drivers/mtd/mtdcore.c | � 17 ++++++++++++++++-
> �1 files changed, 16 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
> index cb4858b..8dd3e46 100644
> --- a/drivers/mtd/mtdcore.c
> +++ b/drivers/mtd/mtdcore.c
> @@ -299,7 +299,7 @@ static struct device_type mtd_devtype = {
>
> �int add_mtd_device(struct mtd_info *mtd)
> �{
> - � � � int i;
> + � � � int i, err;
>
> � � � �if (!mtd->backing_dev_info) {
> � � � � � � � �switch (mtd->type) {
> @@ -322,6 +322,12 @@ int add_mtd_device(struct mtd_info *mtd)
> � � � � � � � �if (!mtd_table[i]) {
> � � � � � � � � � � � �struct mtd_notifier *not;
>
> + � � � � � � � � � � � err = bdi_register(mtd->backing_dev_info, NULL, "mtd%d",
> + � � � � � � � � � � � � � � � � � � � i);
> + � � � � � � � � � � � if (err) {
> + � � � � � � � � � � � � � � � /* We lose the errno information :( */
> + � � � � � � � � � � � � � � � break;
> + � � � � � � � � � � � }
> � � � � � � � � � � � �mtd_table[i] = mtd;
> � � � � � � � � � � � �mtd->index = i;
> � � � � � � � � � � � �mtd->usecount = 0;
> @@ -692,6 +698,15 @@ static int __init init_mtd(void)
> � � � �int ret;
> � � � �ret = class_register(&mtd_class);
>
> + � � � ret = bdi_init(&mtd_bdi_unmappable);
> + � � � if (ret)
> + � � � � � � � return ret;
> + � � � ret = bdi_init(&mtd_bdi_ro_mappable);
> + � � � if (ret)
> + � � � � � � � return ret;
> + � � � ret = bdi_init(&mtd_bdi_rw_mappable);
> + � � � if (ret)
> + � � � � � � � return ret;
> � � � �if (ret) {
> � � � � � � � �pr_err("Error registering mtd class: %d\n", ret);
> � � � � � � � �return ret;
> --
> 1.6.2.1
>
>
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From: Jens Axboe on
On Tue, Apr 27 2010, Paolo Minazzi wrote:
> I have tried this patch.
> I have enabled LOGFS, but not mounted partition with it.
> /dev/mtdblock1 is my romfs root partition and it is OK.
>
> The problem is that init cannot mount my /dev/mtdblock1 romfs root.
>
> This is the fault :
> Platform: Cirrus Logic EDB9315A Board (ARM920T) Rev A
> Copyright (C) 2000, 2001, 2002, Red Hat, Inc.
> |----------------------------------------------
> Raw file loaded 0x00080000-0x001dce6b, assumed entry at
> 0x00080000-----------------------------------------------------------
> RedBoot> exec -s 0x00b00000 -r 0x00a00000 -c "root=/dev/mtdblock1
> console=ttyAM console=tty1"--------------------------------
> ENTRY=0xc0008000-------------------------------------------------------------------------------------------------------------
> LENGTH=0x00300000------------------------------------------------------------------------------------------------------------
> BASE_ADDR=0x00080000---------------------------------------------------------------------------------------------------------
> Using base address 0x00080000 and length
> 0x00300000--------------------------------------------------------------------------
> Uncompressing Linux... done, booting the kernel.
> Linux version 2.6.34-rc5 (root(a)darkstar) (gcc version 3.4.3) #18 Tue
> Apr 27 10:55:55 CEST 2010
> CPU: ARM920T [41129200] revision 0 (ARMv4T), cr=c0007177
> CPU: VIVT data cache, VIVT instruction cache
> Machine: Cirrus Logic EDB9315A Evaluation Board
> Memory policy: ECC disabled, Data cache writeback
> Built 1 zonelists in Zone order, mobility grouping on. Total pages: 32512
> Kernel command line: root=/dev/mtdblock1 console=ttyAM console=tty1
> PID hash table entries: 512 (order: -1, 2048 bytes)
> Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
> Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
> Memory: 128MB = 128MB total
> Memory: 126928k/126928k available, 4144k reserved, 0K highmem
> Virtual kernel memory layout:
> vector : 0xffff0000 - 0xffff1000 ( 4 kB)
> fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
> DMA : 0xffc00000 - 0xffe00000 ( 2 MB)
> vmalloc : 0xc8800000 - 0xfe800000 ( 864 MB)
> lowmem : 0xc0000000 - 0xc8000000 ( 128 MB)
> modules : 0xbf000000 - 0xc0000000 ( 16 MB)
> .init : 0xc0008000 - 0xc0036000 ( 184 kB)
> .text : 0xc0036000 - 0xc02ab000 (2516 kB)
> .data : 0xc02ac000 - 0xc02c4e00 ( 100 kB)
> SLUB: Genslabs=11, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
> Hierarchical RCU implementation.
> NR_IRQS:120
> VIC @fefb0000: id 0x00041190, vendor 0x41
> VIC @fefc0000: id 0x00041190, vendor 0x41
> Console: colour dummy device 80x30
> console [tty1] enabled
> Calibrating delay loop... 99.73 BogoMIPS (lpj=498688)
> Mount-cache hash table entries: 512
> CPU: Testing write buffer coherency: ok
> NET: Registered protocol family 16
> ep93xx clock: PLL1 running at 200 MHz, PLL2 at 48 MHz
> ep93xx clock: FCLK 200 MHz, HCLK 100 MHz, PCLK 50 MHz
> ep93xx dma_m2p: M2P DMA subsystem initialized
> bio: create slab <bio-0> at 0
> SCSI subsystem initialized
> usbcore: registered new interface driver usbfs
> usbcore: registered new interface driver hub
> usbcore: registered new device driver usb
> NET: Registered protocol family 2
> IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
> TCP established hash table entries: 4096 (order: 3, 32768 bytes)
> TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
> TCP: Hash tables configured (established 4096 bind 4096)
> TCP reno registered
> UDP hash table entries: 256 (order: 0, 4096 bytes)
> UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
> NET: Registered protocol family 1
> JFFS2 version 2.2. (NAND) © 2001-2006 Red Hat, Inc.
> ***REGISTER LOGFS
> ***REGISTER LOGFS DONE ret=0
> ROMFS MTD (C) 2007 Red Hat, Inc.
> msgmni has been set to 247
> io scheduler noop registered
> io scheduler deadline registered
> io scheduler cfq registered (default)
> Console: switching to colour frame buffer device 100x37
> graphics fb0: registered. Mode = 800x600-16
> Serial: AMBA driver
> apb:uart1: ttyAM0 at MMIO 0x808c0000 (irq = 52) is a AMBA
> console [ttyAM0] enabled
> apb:uart2: ttyAM1 at MMIO 0x808d0000 (irq = 54) is a AMBA
> apb:uart3: ttyAM2 at MMIO 0x808e0000 (irq = 55) is a AMBA
> dev->num_resources=1
> physmap platform flash device: 02000000 at 60000000
> physmap-flash.0: Found 1 x16 devices at 0x0 in 16-bit bank
> physmap-flash.0: Found 1 x16 devices at 0x1000000 in 16-bit bank
> Intel/Sharp Extended Query Table at 0x0031
> Intel/Sharp Extended Query Table at 0x0031
> Using buffer write method
> cfi_cmdset_0001: Erase suspend on write enabled
> cmdlinepart partition parsing not available
> Searching for RedBoot partition table in physmap-flash.0 at offset 0x1fe0000
> 6 RedBoot partitions found on MTD device physmap-flash.0
> Creating 6 MTD partitions on "physmap-flash.0":
> 0x000000000000-0x000000040000 : "RedBoot"
> 0x000000040000-0x000000b40000 : "ramdisk"
> 0x000000b40000-0x000000e40000 : "zImage"
> 0x000000e40000-0x000001fc0000 : "jffs2"
> 0x000001fc0000-0x000001fe0000 : "RedBoot config"
> 0x000001fe0000-0x000002000000 : "FIS directory"
> PPP generic driver version 2.4.2
> PPP Deflate Compression module registered
> PPP BSD Compression module registered
> ep93xx-eth version 0.1 loading
> eth0: ep93xx on-chip ethernet, IRQ 39, 00:00:11:22:33:36
> ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
> ep93xx-ohci ep93xx-ohci: EP93xx OHCI
> ep93xx-ohci ep93xx-ohci: new USB bus registered, assigned bus number 1
> ep93xx-ohci ep93xx-ohci: irq 56, io mem 0x80020000
> hub 1-0:1.0: USB hub found
> hub 1-0:1.0: 3 ports detected
> usbcore: registered new interface driver cdc_acm
> cdc_acm: v0.26:USB Abstract Control Model driver for USB modems and
> ISDN adapters
> Initializing USB Mass Storage driver...
> usbcore: registered new interface driver usb-storage
> USB Mass Storage support registered.
> ep93xx-rtc ep93xx-rtc: rtc core: registered ep93xx-rtc as rtc0
> usbcore: registered new interface driver usbhid
> usbhid: USB HID core driver
> TCP cubic registered
> NET: Registered protocol family 17
> Last power-down at UTC 08:47:16 on 27/04/2010
> ep93xx-rtc ep93xx-rtc: setting system clock to 2010-04-27 08:47:16 UTC
> (1272358036)
> VFS: Cannot open root device "mtdblock1" or unknown-block(31,1)
> Please append a correct "root=" boot option; here are the available partitions:
> 1f00 256 mtdblock0 (driver?)
> 1f01 11264 mtdblock1 (driver?)
> 1f02 3072 mtdblock2 (driver?)
> 1f03 17920 mtdblock3 (driver?)
> 1f04 128 mtdblock4 (driver?)
> 1f05 128 mtdblock5 (driver?)
> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,1)
> Backtrace:
> [<c003a3dc>] (dump_backtrace+0x0/0x12c) from [<c003a520>] (dump_stack+0x18/0x1c)
> r7:c7c11000 r6:fffffffb r5:c7c11000 r4:00000000
> [<c003a508>] (dump_stack+0x0/0x1c) from [<c0046628>] (panic+0x3c/0xc4)
> [<c00465ec>] (panic+0x0/0xc4) from [<c0008d58>] (mount_block_root+0x110/0x2e8)
> r3:00000000 r2:20000013 r1:c7c27f58 r0:c0276b44
> [<c0008c48>] (mount_block_root+0x0/0x2e8) from [<c0008f84>]
> (mount_root+0x54/0x6c)
> [<c0008f30>] (mount_root+0x0/0x6c) from [<c0009094>]
> (prepare_namespace+0xf8/0x194)
> r5:c001a56c r4:c001a570
> [<c0008f9c>] (prepare_namespace+0x0/0x194) from [<c0008aa4>]
> (kernel_init+0x114/0x15c)
> r6:c0019b0c r5:c0019d5c r4:c02c4e18
> [<c0008990>] (kernel_init+0x0/0x15c) from [<c0048e98>] (do_exit+0x0/0x628)
> r6:00000000 r5:00000000 r4:00000000
>
>
>
> If I disable logfs, my root /dev/mtdblock1 is mounted correclty.

So this issue looks unrelated, but a bug none the less (if just enabling
logfs breaks the mount).

--
Jens Axboe

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From: Jens Axboe on
On Tue, Apr 27 2010, Paolo Minazzi wrote:
> On Tue, Apr 27, 2010 at 11:16 AM, Jens Axboe <jens.axboe(a)oracle.com> wrote:
> > On Tue, Apr 27 2010, Paolo Minazzi wrote:
> >> I have tried this patch.
> >> I have enabled LOGFS, but not mounted partition with it.
> >> /dev/mtdblock1 is my romfs root partition and it is OK.
> >>
> >> The problem is that init cannot mount my /dev/mtdblock1 romfs root.
> >>
> >> This is the fault :
> >> Platform: Cirrus Logic EDB9315A Board (ARM920T) Rev A
> >> Copyright (C) 2000, 2001, 2002, Red Hat, Inc.
> >> � � � �|----------------------------------------------
> >> Raw file loaded 0x00080000-0x001dce6b, assumed entry at
> >> 0x00080000-----------------------------------------------------------
> >> RedBoot> exec -s 0x00b00000 -r 0x00a00000 -c "root=/dev/mtdblock1
> >> console=ttyAM console=tty1"--------------------------------
> >> ENTRY=0xc0008000-------------------------------------------------------------------------------------------------------------
> >> LENGTH=0x00300000------------------------------------------------------------------------------------------------------------
> >> BASE_ADDR=0x00080000---------------------------------------------------------------------------------------------------------
> >> Using base address 0x00080000 and length
> >> 0x00300000--------------------------------------------------------------------------
> >> Uncompressing Linux... done, booting the kernel.
> >> Linux version 2.6.34-rc5 (root(a)darkstar) (gcc version 3.4.3) #18 Tue
> >> Apr 27 10:55:55 CEST 2010
> >> CPU: ARM920T [41129200] revision 0 (ARMv4T), cr=c0007177
> >> CPU: VIVT data cache, VIVT instruction cache
> >> Machine: Cirrus Logic EDB9315A Evaluation Board
> >> Memory policy: ECC disabled, Data cache writeback
> >> Built 1 zonelists in Zone order, mobility grouping on. �Total pages: 32512
> >> Kernel command line: root=/dev/mtdblock1 console=ttyAM console=tty1
> >> PID hash table entries: 512 (order: -1, 2048 bytes)
> >> Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
> >> Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
> >> Memory: 128MB = 128MB total
> >> Memory: 126928k/126928k available, 4144k reserved, 0K highmem
> >> Virtual kernel memory layout:
> >> � � vector �: 0xffff0000 - 0xffff1000 � ( � 4 kB)
> >> � � fixmap �: 0xfff00000 - 0xfffe0000 � ( 896 kB)
> >> � � DMA � � : 0xffc00000 - 0xffe00000 � ( � 2 MB)
> >> � � vmalloc : 0xc8800000 - 0xfe800000 � ( 864 MB)
> >> � � lowmem �: 0xc0000000 - 0xc8000000 � ( 128 MB)
> >> � � modules : 0xbf000000 - 0xc0000000 � ( �16 MB)
> >> � � � .init : 0xc0008000 - 0xc0036000 � ( 184 kB)
> >> � � � .text : 0xc0036000 - 0xc02ab000 � (2516 kB)
> >> � � � .data : 0xc02ac000 - 0xc02c4e00 � ( 100 kB)
> >> SLUB: Genslabs=11, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
> >> Hierarchical RCU implementation.
> >> NR_IRQS:120
> >> VIC @fefb0000: id 0x00041190, vendor 0x41
> >> VIC @fefc0000: id 0x00041190, vendor 0x41
> >> Console: colour dummy device 80x30
> >> console [tty1] enabled
> >> Calibrating delay loop... 99.73 BogoMIPS (lpj=498688)
> >> Mount-cache hash table entries: 512
> >> CPU: Testing write buffer coherency: ok
> >> NET: Registered protocol family 16
> >> ep93xx clock: PLL1 running at 200 MHz, PLL2 at 48 MHz
> >> ep93xx clock: FCLK 200 MHz, HCLK 100 MHz, PCLK 50 MHz
> >> ep93xx dma_m2p: M2P DMA subsystem initialized
> >> bio: create slab <bio-0> at 0
> >> SCSI subsystem initialized
> >> usbcore: registered new interface driver usbfs
> >> usbcore: registered new interface driver hub
> >> usbcore: registered new device driver usb
> >> NET: Registered protocol family 2
> >> IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
> >> TCP established hash table entries: 4096 (order: 3, 32768 bytes)
> >> TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
> >> TCP: Hash tables configured (established 4096 bind 4096)
> >> TCP reno registered
> >> UDP hash table entries: 256 (order: 0, 4096 bytes)
> >> UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
> >> NET: Registered protocol family 1
> >> JFFS2 version 2.2. (NAND) � 2001-2006 Red Hat, Inc.
> >> ***REGISTER LOGFS
> >> ***REGISTER LOGFS DONE ret=0
> >> ROMFS MTD (C) 2007 Red Hat, Inc.
> >> msgmni has been set to 247
> >> io scheduler noop registered
> >> io scheduler deadline registered
> >> io scheduler cfq registered (default)
> >> Console: switching to colour frame buffer device 100x37
> >> graphics fb0: registered. Mode = 800x600-16
> >> Serial: AMBA driver
> >> apb:uart1: ttyAM0 at MMIO 0x808c0000 (irq = 52) is a AMBA
> >> console [ttyAM0] enabled
> >> apb:uart2: ttyAM1 at MMIO 0x808d0000 (irq = 54) is a AMBA
> >> apb:uart3: ttyAM2 at MMIO 0x808e0000 (irq = 55) is a AMBA
> >> dev->num_resources=1
> >> physmap platform flash device: 02000000 at 60000000
> >> physmap-flash.0: Found 1 x16 devices at 0x0 in 16-bit bank
> >> physmap-flash.0: Found 1 x16 devices at 0x1000000 in 16-bit bank
> >> �Intel/Sharp Extended Query Table at 0x0031
> >> �Intel/Sharp Extended Query Table at 0x0031
> >> Using buffer write method
> >> cfi_cmdset_0001: Erase suspend on write enabled
> >> cmdlinepart partition parsing not available
> >> Searching for RedBoot partition table in physmap-flash.0 at offset 0x1fe0000
> >> 6 RedBoot partitions found on MTD device physmap-flash.0
> >> Creating 6 MTD partitions on "physmap-flash.0":
> >> 0x000000000000-0x000000040000 : "RedBoot"
> >> 0x000000040000-0x000000b40000 : "ramdisk"
> >> 0x000000b40000-0x000000e40000 : "zImage"
> >> 0x000000e40000-0x000001fc0000 : "jffs2"
> >> 0x000001fc0000-0x000001fe0000 : "RedBoot config"
> >> 0x000001fe0000-0x000002000000 : "FIS directory"
> >> PPP generic driver version 2.4.2
> >> PPP Deflate Compression module registered
> >> PPP BSD Compression module registered
> >> ep93xx-eth version 0.1 loading
> >> eth0: ep93xx on-chip ethernet, IRQ 39, 00:00:11:22:33:36
> >> ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
> >> ep93xx-ohci ep93xx-ohci: EP93xx OHCI
> >> ep93xx-ohci ep93xx-ohci: new USB bus registered, assigned bus number 1
> >> ep93xx-ohci ep93xx-ohci: irq 56, io mem 0x80020000
> >> hub 1-0:1.0: USB hub found
> >> hub 1-0:1.0: 3 ports detected
> >> usbcore: registered new interface driver cdc_acm
> >> cdc_acm: v0.26:USB Abstract Control Model driver for USB modems and
> >> ISDN adapters
> >> Initializing USB Mass Storage driver...
> >> usbcore: registered new interface driver usb-storage
> >> USB Mass Storage support registered.
> >> ep93xx-rtc ep93xx-rtc: rtc core: registered ep93xx-rtc as rtc0
> >> usbcore: registered new interface driver usbhid
> >> usbhid: USB HID core driver
> >> TCP cubic registered
> >> NET: Registered protocol family 17
> >> Last power-down at UTC 08:47:16 on 27/04/2010
> >> ep93xx-rtc ep93xx-rtc: setting system clock to 2010-04-27 08:47:16 UTC
> >> (1272358036)
> >> VFS: Cannot open root device "mtdblock1" or unknown-block(31,1)
> >> Please append a correct "root=" boot option; here are the available partitions:
> >> 1f00 � � � � � � 256 mtdblock0 (driver?)
> >> 1f01 � � � � � 11264 mtdblock1 (driver?)
> >> 1f02 � � � � � �3072 mtdblock2 (driver?)
> >> 1f03 � � � � � 17920 mtdblock3 (driver?)
> >> 1f04 � � � � � � 128 mtdblock4 (driver?)
> >> 1f05 � � � � � � 128 mtdblock5 (driver?)
> >> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,1)
> >> Backtrace:
> >> [<c003a3dc>] (dump_backtrace+0x0/0x12c) from [<c003a520>] (dump_stack+0x18/0x1c)
> >> �r7:c7c11000 r6:fffffffb r5:c7c11000 r4:00000000
> >> [<c003a508>] (dump_stack+0x0/0x1c) from [<c0046628>] (panic+0x3c/0xc4)
> >> [<c00465ec>] (panic+0x0/0xc4) from [<c0008d58>] (mount_block_root+0x110/0x2e8)
> >> �r3:00000000 r2:20000013 r1:c7c27f58 r0:c0276b44
> >> [<c0008c48>] (mount_block_root+0x0/0x2e8) from [<c0008f84>]
> >> (mount_root+0x54/0x6c)
> >> [<c0008f30>] (mount_root+0x0/0x6c) from [<c0009094>]
> >> (prepare_namespace+0xf8/0x194)
> >> �r5:c001a56c r4:c001a570
> >> [<c0008f9c>] (prepare_namespace+0x0/0x194) from [<c0008aa4>]
> >> (kernel_init+0x114/0x15c)
> >> �r6:c0019b0c r5:c0019d5c r4:c02c4e18
> >> [<c0008990>] (kernel_init+0x0/0x15c) from [<c0048e98>] (do_exit+0x0/0x628)
> >> �r6:00000000 r5:00000000 r4:00000000
> >>
> >>
> >>
> >> If I disable logfs, my root /dev/mtdblock1 is mounted correclty.
> >
> > So this issue looks unrelated, but a bug none the less (if just enabling
> > logfs breaks the mount).
>
> To be precise, I say :
>
> - downloaded 2.6.34rc5
> - apply the jens patch
> - the logfs code is the code in the 2.6.34rc5 (I have no applied other
> jorn patch)

(please stop top posting, I fixed this one up for you).

Just to be on the safe side - without the patch, does it work or not?

--
Jens Axboe

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From: Paolo Minazzi on
To be precise, I say :

- downloaded 2.6.34rc5
- apply the jens patch
- the logfs code is the code in the 2.6.34rc5 (I have no applied other
jorn patch)

Paolo

On Tue, Apr 27, 2010 at 11:16 AM, Jens Axboe <jens.axboe(a)oracle.com> wrote:
> On Tue, Apr 27 2010, Paolo Minazzi wrote:
>> I have tried this patch.
>> I have enabled LOGFS, but not mounted partition with it.
>> /dev/mtdblock1 is my romfs root partition and it is OK.
>>
>> The problem is that init cannot mount my /dev/mtdblock1 romfs root.
>>
>> This is the fault :
>> Platform: Cirrus Logic EDB9315A Board (ARM920T) Rev A
>> Copyright (C) 2000, 2001, 2002, Red Hat, Inc.
>> � � � �|----------------------------------------------
>> Raw file loaded 0x00080000-0x001dce6b, assumed entry at
>> 0x00080000-----------------------------------------------------------
>> RedBoot> exec -s 0x00b00000 -r 0x00a00000 -c "root=/dev/mtdblock1
>> console=ttyAM console=tty1"--------------------------------
>> ENTRY=0xc0008000-------------------------------------------------------------------------------------------------------------
>> LENGTH=0x00300000------------------------------------------------------------------------------------------------------------
>> BASE_ADDR=0x00080000---------------------------------------------------------------------------------------------------------
>> Using base address 0x00080000 and length
>> 0x00300000--------------------------------------------------------------------------
>> Uncompressing Linux... done, booting the kernel.
>> Linux version 2.6.34-rc5 (root(a)darkstar) (gcc version 3.4.3) #18 Tue
>> Apr 27 10:55:55 CEST 2010
>> CPU: ARM920T [41129200] revision 0 (ARMv4T), cr=c0007177
>> CPU: VIVT data cache, VIVT instruction cache
>> Machine: Cirrus Logic EDB9315A Evaluation Board
>> Memory policy: ECC disabled, Data cache writeback
>> Built 1 zonelists in Zone order, mobility grouping on. �Total pages: 32512
>> Kernel command line: root=/dev/mtdblock1 console=ttyAM console=tty1
>> PID hash table entries: 512 (order: -1, 2048 bytes)
>> Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
>> Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
>> Memory: 128MB = 128MB total
>> Memory: 126928k/126928k available, 4144k reserved, 0K highmem
>> Virtual kernel memory layout:
>> � � vector �: 0xffff0000 - 0xffff1000 � ( � 4 kB)
>> � � fixmap �: 0xfff00000 - 0xfffe0000 � ( 896 kB)
>> � � DMA � � : 0xffc00000 - 0xffe00000 � ( � 2 MB)
>> � � vmalloc : 0xc8800000 - 0xfe800000 � ( 864 MB)
>> � � lowmem �: 0xc0000000 - 0xc8000000 � ( 128 MB)
>> � � modules : 0xbf000000 - 0xc0000000 � ( �16 MB)
>> � � � .init : 0xc0008000 - 0xc0036000 � ( 184 kB)
>> � � � .text : 0xc0036000 - 0xc02ab000 � (2516 kB)
>> � � � .data : 0xc02ac000 - 0xc02c4e00 � ( 100 kB)
>> SLUB: Genslabs=11, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
>> Hierarchical RCU implementation.
>> NR_IRQS:120
>> VIC @fefb0000: id 0x00041190, vendor 0x41
>> VIC @fefc0000: id 0x00041190, vendor 0x41
>> Console: colour dummy device 80x30
>> console [tty1] enabled
>> Calibrating delay loop... 99.73 BogoMIPS (lpj=498688)
>> Mount-cache hash table entries: 512
>> CPU: Testing write buffer coherency: ok
>> NET: Registered protocol family 16
>> ep93xx clock: PLL1 running at 200 MHz, PLL2 at 48 MHz
>> ep93xx clock: FCLK 200 MHz, HCLK 100 MHz, PCLK 50 MHz
>> ep93xx dma_m2p: M2P DMA subsystem initialized
>> bio: create slab <bio-0> at 0
>> SCSI subsystem initialized
>> usbcore: registered new interface driver usbfs
>> usbcore: registered new interface driver hub
>> usbcore: registered new device driver usb
>> NET: Registered protocol family 2
>> IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
>> TCP established hash table entries: 4096 (order: 3, 32768 bytes)
>> TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
>> TCP: Hash tables configured (established 4096 bind 4096)
>> TCP reno registered
>> UDP hash table entries: 256 (order: 0, 4096 bytes)
>> UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
>> NET: Registered protocol family 1
>> JFFS2 version 2.2. (NAND) � 2001-2006 Red Hat, Inc.
>> ***REGISTER LOGFS
>> ***REGISTER LOGFS DONE ret=0
>> ROMFS MTD (C) 2007 Red Hat, Inc.
>> msgmni has been set to 247
>> io scheduler noop registered
>> io scheduler deadline registered
>> io scheduler cfq registered (default)
>> Console: switching to colour frame buffer device 100x37
>> graphics fb0: registered. Mode = 800x600-16
>> Serial: AMBA driver
>> apb:uart1: ttyAM0 at MMIO 0x808c0000 (irq = 52) is a AMBA
>> console [ttyAM0] enabled
>> apb:uart2: ttyAM1 at MMIO 0x808d0000 (irq = 54) is a AMBA
>> apb:uart3: ttyAM2 at MMIO 0x808e0000 (irq = 55) is a AMBA
>> dev->num_resources=1
>> physmap platform flash device: 02000000 at 60000000
>> physmap-flash.0: Found 1 x16 devices at 0x0 in 16-bit bank
>> physmap-flash.0: Found 1 x16 devices at 0x1000000 in 16-bit bank
>> �Intel/Sharp Extended Query Table at 0x0031
>> �Intel/Sharp Extended Query Table at 0x0031
>> Using buffer write method
>> cfi_cmdset_0001: Erase suspend on write enabled
>> cmdlinepart partition parsing not available
>> Searching for RedBoot partition table in physmap-flash.0 at offset 0x1fe0000
>> 6 RedBoot partitions found on MTD device physmap-flash.0
>> Creating 6 MTD partitions on "physmap-flash.0":
>> 0x000000000000-0x000000040000 : "RedBoot"
>> 0x000000040000-0x000000b40000 : "ramdisk"
>> 0x000000b40000-0x000000e40000 : "zImage"
>> 0x000000e40000-0x000001fc0000 : "jffs2"
>> 0x000001fc0000-0x000001fe0000 : "RedBoot config"
>> 0x000001fe0000-0x000002000000 : "FIS directory"
>> PPP generic driver version 2.4.2
>> PPP Deflate Compression module registered
>> PPP BSD Compression module registered
>> ep93xx-eth version 0.1 loading
>> eth0: ep93xx on-chip ethernet, IRQ 39, 00:00:11:22:33:36
>> ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
>> ep93xx-ohci ep93xx-ohci: EP93xx OHCI
>> ep93xx-ohci ep93xx-ohci: new USB bus registered, assigned bus number 1
>> ep93xx-ohci ep93xx-ohci: irq 56, io mem 0x80020000
>> hub 1-0:1.0: USB hub found
>> hub 1-0:1.0: 3 ports detected
>> usbcore: registered new interface driver cdc_acm
>> cdc_acm: v0.26:USB Abstract Control Model driver for USB modems and
>> ISDN adapters
>> Initializing USB Mass Storage driver...
>> usbcore: registered new interface driver usb-storage
>> USB Mass Storage support registered.
>> ep93xx-rtc ep93xx-rtc: rtc core: registered ep93xx-rtc as rtc0
>> usbcore: registered new interface driver usbhid
>> usbhid: USB HID core driver
>> TCP cubic registered
>> NET: Registered protocol family 17
>> Last power-down at UTC 08:47:16 on 27/04/2010
>> ep93xx-rtc ep93xx-rtc: setting system clock to 2010-04-27 08:47:16 UTC
>> (1272358036)
>> VFS: Cannot open root device "mtdblock1" or unknown-block(31,1)
>> Please append a correct "root=" boot option; here are the available partitions:
>> 1f00 � � � � � � 256 mtdblock0 (driver?)
>> 1f01 � � � � � 11264 mtdblock1 (driver?)
>> 1f02 � � � � � �3072 mtdblock2 (driver?)
>> 1f03 � � � � � 17920 mtdblock3 (driver?)
>> 1f04 � � � � � � 128 mtdblock4 (driver?)
>> 1f05 � � � � � � 128 mtdblock5 (driver?)
>> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,1)
>> Backtrace:
>> [<c003a3dc>] (dump_backtrace+0x0/0x12c) from [<c003a520>] (dump_stack+0x18/0x1c)
>> �r7:c7c11000 r6:fffffffb r5:c7c11000 r4:00000000
>> [<c003a508>] (dump_stack+0x0/0x1c) from [<c0046628>] (panic+0x3c/0xc4)
>> [<c00465ec>] (panic+0x0/0xc4) from [<c0008d58>] (mount_block_root+0x110/0x2e8)
>> �r3:00000000 r2:20000013 r1:c7c27f58 r0:c0276b44
>> [<c0008c48>] (mount_block_root+0x0/0x2e8) from [<c0008f84>]
>> (mount_root+0x54/0x6c)
>> [<c0008f30>] (mount_root+0x0/0x6c) from [<c0009094>]
>> (prepare_namespace+0xf8/0x194)
>> �r5:c001a56c r4:c001a570
>> [<c0008f9c>] (prepare_namespace+0x0/0x194) from [<c0008aa4>]
>> (kernel_init+0x114/0x15c)
>> �r6:c0019b0c r5:c0019d5c r4:c02c4e18
>> [<c0008990>] (kernel_init+0x0/0x15c) from [<c0048e98>] (do_exit+0x0/0x628)
>> �r6:00000000 r5:00000000 r4:00000000
>>
>>
>>
>> If I disable logfs, my root /dev/mtdblock1 is mounted correclty.
>
> So this issue looks unrelated, but a bug none the less (if just enabling
> logfs breaks the mount).
>
> --
> Jens Axboe
>
>
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From: Paolo Minazzi on
> Just to be on the safe side - without the patch, does it work or not?
>
> --
> Jens Axboe

Without the patch for me means the standard 2.6.34rc5.
In this case :
- enabling logfs I have an oop in fs/write-back.c:157 before kernel calls init.
- disabling logfs I can do normal mount my root /dev/mtdblock1

This is my experience.

Paolo
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