Problem in changing the starting location of JFFS2 for AMD flash

[Sanjay Kumar]

Hi All,
I am using AMD flash of 4M size and keeping starting 1/2 MB for RAW data. Then for the remaining I want to use JFFS2. That is JFF2 will start from 0.5 MB to 4MB. For that I am making changes in super.c of JFFS2 for function jffs2_read_super. The changes are -    
c->free_size = c->mtd->size - jffs2_start_addr;
c->flash_size = c->mtd->size - jffs2_start_addr;
c->nr_blocks = c->flash_size / c->sector_size;
c->blocks[i].offset = i * c->sector_size + jffs2_start_addr;

where am keeping jffs2_start_addr = 0x80000.

I am using linux 2.4.2.

Now I am able to mount the jffs2 file system and able to create a empty file. But when I go for writing into the created empty file, it is crashing.

The dump of the log message is as follows -

mountJffs("/flash0")
jffs2: read_super for device 1f:00
jffs2_scan_eraseblock(): Scanning block at 0x80000
Found empty flash at 0x8000c
Empty flash detected from 0x0008000c to 0x00090000
Block at 0x00080000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x90000
Found empty flash at 0x9000c
Empty flash detected from 0x0009000c to 0x000a0000
Block at 0x00090000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0xa0000
Found empty flash at 0xa000c
Empty flash detected from 0x000a000c to 0x000b0000
Block at 0x000a0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0xb0000
Found empty flash at 0xb000c
Empty flash detected from 0x000b000c to 0x000c0000
Block at 0x000b0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0xc0000
Found empty flash at 0xc000c
Empty flash detected from 0x000c000c to 0x000d0000
Block at 0x000c0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0xd0000
Found empty flash at 0xd000c
Empty flash detected from 0x000d000c to 0x000e0000
Block at 0x000d0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0xe0000
Found empty flash at 0xe000c
Empty flash detected from 0x000e000c to 0x000f0000
Block at 0x000e0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0xf0000
Found empty flash at 0xf000c
Empty flash detected from 0x000f000c to 0x00100000
Block at 0x000f0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x100000
Found empty flash at 0x10000c
Empty flash detected from 0x0010000c to 0x00110000
Block at 0x00100000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x110000
Found empty flash at 0x11000c
Empty flash detected from 0x0011000c to 0x00120000
Block at 0x00110000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x120000
Found empty flash at 0x12000c
Empty flash detected from 0x0012000c to 0x00130000
Block at 0x00120000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x130000
Found empty flash at 0x13000c
Empty flash detected from 0x0013000c to 0x00140000
Block at 0x00130000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x140000
Found empty flash at 0x14000c
Empty flash detected from 0x0014000c to 0x00150000
Block at 0x00140000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x150000
Found empty flash at 0x15000c
Empty flash detected from 0x0015000c to 0x00160000
Block at 0x00150000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x160000
Found empty flash at 0x16000c
Empty flash detected from 0x0016000c to 0x00170000
Block at 0x00160000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x170000
Found empty flash at 0x17000c
Empty flash detected from 0x0017000c to 0x00180000
Block at 0x00170000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x180000
Found empty flash at 0x18000c
Empty flash detected from 0x0018000c to 0x00190000
Block at 0x00180000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x190000
Found empty flash at 0x19000c
Empty flash detected from 0x0019000c to 0x001a0000
Block at 0x00190000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x1a0000
Found empty flash at 0x1a000c
Empty flash detected from 0x001a000c to 0x001b0000
Block at 0x001a0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x1b0000
Found empty flash at 0x1b000c
Empty flash detected from 0x001b000c to 0x001c0000
Block at 0x001b0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x1c0000
Found empty flash at 0x1c000c
Empty flash detected from 0x001c000c to 0x001d0000
Block at 0x001c0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x1d0000
Found empty flash at 0x1d000c
Empty flash detected from 0x001d000c to 0x001e0000
Block at 0x001d0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x1e0000
Found empty flash at 0x1e000c
Empty flash detected from 0x001e000c to 0x001f0000
Block at 0x001e0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x1f0000
Found empty flash at 0x1f000c
Empty flash detected from 0x001f000c to 0x00200000
Block at 0x001f0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x200000
Found empty flash at 0x20000c
Empty flash detected from 0x0020000c to 0x00210000
Block at 0x00200000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x210000
Found empty flash at 0x21000c
Empty flash detected from 0x0021000c to 0x00220000
Block at 0x00210000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x220000
Found empty flash at 0x22000c
Empty flash detected from 0x0022000c to 0x00230000
Block at 0x00220000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x230000
Found empty flash at 0x23000c
Empty flash detected from 0x0023000c to 0x00240000
Block at 0x00230000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x240000
Found empty flash at 0x24000c
Empty flash detected from 0x0024000c to 0x00250000
Block at 0x00240000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x250000
Found empty flash at 0x25000c
Empty flash detected from 0x0025000c to 0x00260000
Block at 0x00250000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x260000
Found empty flash at 0x26000c
Empty flash detected from 0x0026000c to 0x00270000
Block at 0x00260000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x270000
Found empty flash at 0x27000c
Empty flash detected from 0x0027000c to 0x00280000
Block at 0x00270000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x280000
Found empty flash at 0x28000c
Empty flash detected from 0x0028000c to 0x00290000
Block at 0x00280000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x290000
Found empty flash at 0x29000c
Empty flash detected from 0x0029000c to 0x002a0000
Block at 0x00290000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x2a0000
Found empty flash at 0x2a000c
Empty flash detected from 0x002a000c to 0x002b0000
Block at 0x002a0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x2b0000
Found empty flash at 0x2b000c
Empty flash detected from 0x002b000c to 0x002c0000
Block at 0x002b0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x2c0000
Found empty flash at 0x2c000c
Empty flash detected from 0x002c000c to 0x002d0000
Block at 0x002c0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x2d0000
Found empty flash at 0x2d000c
Empty flash detected from 0x002d000c to 0x002e0000
Block at 0x002d0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x2e0000
Found empty flash at 0x2e000c
Empty flash detected from 0x002e000c to 0x002f0000
Block at 0x002e0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x2f0000
Found empty flash at 0x2f000c
Empty flash detected from 0x002f000c to 0x00300000
Block at 0x002f0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x300000
Found empty flash at 0x30000c
Empty flash detected from 0x0030000c to 0x00310000
Block at 0x00300000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x310000
Found empty flash at 0x31000c
Empty flash detected from 0x0031000c to 0x00320000
Block at 0x00310000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x320000
Found empty flash at 0x32000c
Empty flash detected from 0x0032000c to 0x00330000
Block at 0x00320000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x330000
Found empty flash at 0x33000c
Empty flash detected from 0x0033000c to 0x00340000
Block at 0x00330000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x340000
Found empty flash at 0x34000c
Empty flash detected from 0x0034000c to 0x00350000
Block at 0x00340000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x350000
Found empty flash at 0x35000c
Empty flash detected from 0x0035000c to 0x00360000
Block at 0x00350000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x360000
Found empty flash at 0x36000c
Empty flash detected from 0x0036000c to 0x00370000
Block at 0x00360000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x370000
Found empty flash at 0x37000c
Empty flash detected from 0x0037000c to 0x00380000
Block at 0x00370000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x380000
Found empty flash at 0x38000c
Empty flash detected from 0x0038000c to 0x00390000
Block at 0x00380000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x390000
Found empty flash at 0x39000c
Empty flash detected from 0x0039000c to 0x003a0000
Block at 0x00390000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x3a0000
Found empty flash at 0x3a000c
Empty flash detected from 0x003a000c to 0x003b0000
Block at 0x003a0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x3b0000
Found empty flash at 0x3b000c
Empty flash detected from 0x003b000c to 0x003c0000
Block at 0x003b0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x3c0000
Found empty flash at 0x3c000c
Empty flash detected from 0x003c000c to 0x003d0000
Block at 0x003c0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x3d0000
Found empty flash at 0x3d000c
Empty flash detected from 0x003d000c to 0x003e0000
Block at 0x003d0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x3e0000
Found empty flash at 0x3e000c
Empty flash detected from 0x003e000c to 0x003f0000
Block at 0x003e0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
jffs2_scan_eraseblock(): Scanning block at 0x3f0000
Found empty flash at 0x3f000c
Empty flash detected from 0x003f000c to 0x00400000
Block at 0x003f0000: free 0x0000fff4, dirty 0x00000000, used 0x0000000c
Scanned flash completely
Pass 1 complete
Pass 2 (re)starting
Pass 2 complete
Pass 3 complete
jffs2_read_super(): Getting root inode
jffs2_read_inode(): inode->i_ino == 1
getting inocache
jffs2_get_ino_cache(): ino 1
jffs2_get_ino_cache found 00000000 for ino 1
jffs2_read_inode(): Got inocache at 00000000
Allocated inocache at 80bc12c0
jffs2_read_inode(): Creating inocache for root inode
jffs2_add_ino_cache: Add 80bc12c0 (ino #1)
jffs2_read_inode(): ino #1 nlink is 1
jffs2_read_inode() returning #1
jffs2_read_super(): d_alloc_root()
JFFS2: Garbage collect thread is pid 10
thread_should_wake(): nr_free_blocks 56, nr_erasing_blocks 0, dirty_size 0x0
jffs2_garbage_collect_thread sleeping...
value = 0 = 0x0
->
>createJffsFile("/flash0/hello.txt")
jffs2_lookup()
jffs2_create()
jffs2_reserve_space(): Requested 0x44 bytes
jffs2_reserve_space(): alloc sem got
jffs2_do_reserve_space(): Giving 0xfff4 bytes at 0x3f000c
jffs2_create(): reserved 0xfff4 bytes
jffs2_new_inode(): dir_i 1, mode 0x8000
Allocated inocache at 80bc02d4
jffs2_new_inode(): Assigned ino# 2
jffs2_add_ino_cache: Add 80bc02d4 (ino #2)
jffs2_add_physical_node_ref(): Node at 0x3f000c, size 0x44
jffs2_write_dnode wrote node at 0x003f000c with dsize 0x0, csize 0x0, node_crc 0
xfef3c9ce, data_crc 0x00000000, totlen 0x00000044
jffs2_create created file with mode 0x8000
jffs2_write_dirent(ino #1, name "hello.txt"->ino #2
jffs2_add_physical_node_ref(): Node at 0x3f0050, size 0x34
jffs2_complete_reservation()ace
thread_should_wake(): nr_free_blocks 55, nr_erasing_blocks 0, dirty_size 0x0
jffs2_add_fd_to_list( 80b3e610, 80bd518c (->00000000))
Dirent "hello.txt" (hash 0x709521d5, ino #2
jffs2_create: Created ino #2 with mode 100000, nlink 1(1). nrpages 0
File descriptor = 5value = 0 = 0x0
->
sys_write(5,"hello",5)
<6>jffs2_prepare_write() nrpages 1
jffs2_do_readpage_nolock(): ino #2, page at offset 0x0
jffs2_readpage: offset 0, end 4096
Filling non-frag hole from 0-4096
readpage finishing
readpage finished
end prepare_write(). nrpages 1
jffs2_commit_write() loop: 0x5 to write to 0x0ge 0-5, nrpages 1
jffs2_reserve_space(): Requested 0xc4 bytes
jffs2_reserve_space(): alloc sem got
jffs2_do_reserve_space(): Giving 0xfff4 bytes at 0x3f000c
ARGH. About to write node to 0x003f000c on flash, but there's data already there
:
0x003f000c: 19 85 e0 02 00 00 00 44 a4 ef 22 3e 00 00 00 02
Last[2] is ff86, datum is 49
Write of 73 bytes at 0x003f000c failed. returned 0, retlen 6
jffs2_add_physical_node_ref(): Node at 0x3f000c, size 0x4c
raw node at 0x003f000c is off the end of device!
kernel BUG at nodemgmt.c:301!
Unable to handle kernel paging request at virtual address 00000000, epc == 809a6
180, ra == 809a6180
Oops in fault.c:do_page_fault, line 189:



And so I am not able to proceed. If anyone has any idea this problem or any suggestions?
Thanks,
Sanjay


--
Click here for your very own create-a-date adventure from MatchMaker
Go to http://ecard.matchmaker.com/dating.html