No clean _or_ dirty blocks to GC from!

Larry Doolittle ldoolitt at
Thu Oct 4 12:35:33 EDT 2001

This is really strange.  I go through the following steps:

0. Run linux-2.4.9-ac10-rmk2-np1 with latest CVS MTD/JFFS2 on a
   StrongARM with Intel 28F320B3B Flash.  /dev/mtd2 is a 1M partition.

1. eraseall /dev/mtd2
    (works, I can verify all 1's in the 16 64K blocks)

2. cp image /dev/mtd2
    (image created with mkfs.jffs2.  Seems to work)

3. mount -t jffs2 /dev/mtdblock2 /mnt/test

jffs2: No clean _or_ dirty blocks to GC from! Where are they all?
jffs2: Couldn't find erase block to garbage collect!

   The files are there.

4. umount /mnt/test

5. check the blocks -- the 15 blocks that were all 1's before
   all now have at the beginning:

begin 644 foo

$ hexdump foo
0000000 1985 2003 000c 0000 b0b1 e41e ffff ffff
0000010 ffff ffff ffff ffff ffff ffff ffff ffff

   Wild guess, after reading jffs2.h: these are "clean" markers.
   magic is 0x1985 == JFFS2_MAGIC_BITMASK,
   nodetype is 0x2003 == JFFS2_NODETYPE_CLEANMARKER,
   totlen is 12,
   hdr_crc is 0xe41eb0b1.
   So everything is fine, why the complaint?  And if I mount again,
   I get the same nasty message as before.

Clearly, I'm still a novice at JFFS2.

     - Larry

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