[parisc-linux] documented Oops running big-endian reiserfs on parisc architecture

[thunder7@xs4all.nl]

Well, I watched the number of files in /lost+found grow every time I
had to pull the plug from my HP C200, so I added a 'sync' option in
/etc/fstab and tried to get reiserfs working.

I patched my 2.4.9-pa13 kernel with

endian-safe-reiserfs-for-2.4.8.patch

which went without warnings or errors. A patched
reiserfs-progs-3.x.0k-pre9 also built well (despite what the configure
scripts says, you _need_ automake).

Creating a reiserfs-partition went without a hitch.

running bonnie -s 128 on it did this:

Adding Swap: 1041400k swap-space (priority -1)
eth0: Setting half-duplex based on MII#1 link partner capability of 0021.
reiserfs: checking transaction log (device 08:03) ...
Using r5 hash to sort names
ReiserFS version 3.6.25
bonnie[163]: Unaligned data reference 28

     YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI
PSW: 00000000000001001111111100001110
r0-3     00000000 102ec550 10197d0c 26f24838
r4-7     26f24848 27054e40 00000011 00000020
r8-11    0000000a 26f06580 00000020 26f247a0
r12-15   27088d1c ffffffff 26f24838 00000001
r16-19   26f24708 faf02c68 0006a248 26f24852
r20-23   0000000f 00000003 03000000 00000002
r24-27   0000000a 0000000a 26f24848 102d4010
r28-31   26f24848 01000000 26f24b40 10196fc8
sr0-3    00000000 00000004 00000000 00000004
sr4-7    00000000 00000000 00000000 00000000

IASQ: 00000000 00000000 IAOQ: 10197d10 10197d14
 IIR: 0c7c1093    ISR: 00000000  IOR: 26f24846
 ORIG_R28: 00000000
pa8200:/var/log#

After reading in the archives about ksymoops, I looked up this part of
my System.map:

101979e0 T reiserfs_lookup
101979e0 t .L1432
10197ad4 t reiserfs_add_entry
10197e50 t .L1512
10197f28 t .L1510
10198068 T reiserfs_create

objdump -d /boot/linux-2.4.9-pa13 revealed:

10197cbc:       d6 d6 0b 18     depw,z r22,7,8,r22
10197cc0:       d6 b5 0a 10     depw,z r21,15,16,r21
10197cc4:       41 33 01 fe     ldb ff(sr0,r9),r19
10197cc8:       0a d5 02 75     or r21,r22,r21
10197ccc:       d6 94 09 08     depw,z r20,23,24,r20
10197cd0:       0a b4 02 74     or r20,r21,r20
10197cd4:       0a 93 02 73     or r19,r20,r19
10197cd8:       d2 75 18 f8     extrw,u r19,7,8,r21
10197cdc:       d2 74 19 f8     extrw,u r19,15,8,r20
10197ce0:       0c 73 12 16     stb  r19,b(sr0,r3)
10197ce4:       d2 73 1a f8     extrw,u r19,23,8,r19
10197ce8:       0c 75 12 10     stb  r21,8(sr0,r3)
10197cec:       0c 74 12 12     stb  r20,9(sr0,r3)
10197cf0:       e8 86 a9 e4     b,l 102a51e8 <memcpy>,%r2
10197cf4:       0c 73 12 14     stb  r19,a(sr0,r3)
10197cf8:       08 06 02 59     copy r6,r25
10197cfc:       08 04 02 5a     copy r4,r26
10197d00:       d7 20 1c 1d     depwi 0,31,3,r25
10197d04:       e8 0d a5 d8     call 101b1ff8 <padd_item>
10197d08:       08 08 02 58     copy r8,r24
10197d0c:       00 01 0e 74     rsm 1,r20
10197d10:       0c 7c 10 93     ldw  e(sr0,r3),r19
10197d14:       d6 60 1f 1f     depwi 0,7,1,r19
10197d18:       0c 73 12 9c     stw  r19,e(sr0,r3)
10197d1c:       00 14 18 60     mtsm r20
10197d20:       85 e0 26 32     cmpib,=,n 0,r15,10198040 <.L1510+0x118>
10197d24:       00 01 0e 74     rsm 1,r20
10197d28:       0c 7c 10 93     ldw  e(sr0,r3),r19
10197d2c:       d6 7f 1f 5f     depwi -1,5,1,r19
10197d30:       0c 73 12 9c     stw  r19,e(sr0,r3)
10197d34:       00 14 18 60     mtsm r20
10197d38:       08 00 02 54     copy r0,r20
10197d3c:       08 00 02 55     copy r0,r21
10197d40:       37 c6 3e 51     ldo -d8(sp),r6
10197d44:       37 cd 3d c1     ldo -120(sp),r13
10197d48:       6b d4 3e 51     stw r20,-d8(sr0,sp)
10197d4c:       6b d5 3e 59     stw r21,-d4(sr0,sp)
10197d50:       6b d4 3e 61     stw r20,-d0(sr0,sp)
10197d54:       6b d5 3e 69     stw r21,-cc(sr0,sp)
10197d58:       08 0c 02 59     copy r12,r25
10197d5c:       6b c6 3e 01     stw r6,-100(sr0,sp)
10197d60:       6b cd 3f 99     stw r13,-34(sr0,sp)
10197d64:       08 08 02 58     copy r8,r24
10197d68:       08 05 02 5a     copy r5,r26
10197d6c:       eb ff b4 4d     b,l 10197798 <reiserfs_find_entry>,%r2

which makes the error somewhere around here in 
fs/reiserfs/namei.c, function reiserfs_add_entry, after call to
padd_item, before call to reiserfs_find_entry:

    /* copy name */
    memcpy ((char *)(deh + 1), name, namelen);
    /* padd by 0s to the 4 byte boundary */
    padd_item ((char *)(deh + 1), ROUND_UP (namelen), namelen);

    /* entry is ready to be pasted into tree, set 'visibility' and 'stat data in entry' attributes */
    mark_de_without_sd (deh);
    visible ? mark_de_visible (deh) : mark_de_hidden (deh);

    /* find the proper place for the new entry */
    memset (bit_string, 0, sizeof (bit_string));
    de.de_gen_number_bit_string = (char *)bit_string;
    retval = reiserfs_find_entry (dir, name, namelen, &path, &de);


And there I'm stuck. I'm sending this to the parisc-list to document the
failure, and to linux-kernel to reach some reiserfs-experts, perhaps.

I'm willing to test anything!

Good luck,
Jurriaan
-- 
"I have seen her. That is enough, perhaps."
Pug smiled. "You are a rare man."
	Raymond E Feist - The King's Buccaneer
GNU/Linux 2.4.9-ac5 SMP/ReiserFS 2x1402 bogomips load av: 0.04 0.01 0.06