Re: [Yaffs] Sequence Number

So the object I was really after then was the objectID rather than the
blockID.

cool.

On Tue, Jun 21, 2011 at 2:45 PM, Peter Pilley <peter.pilley@gmail.com>wrote:

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> On Tue, Jun 21, 2011 at 2:35 PM, Charles Manning <manningc2@actrix.gen.nz>wrote:
>
>> On Tuesday 21 June 2011 13:46:41 Peter Pilley wrote:
>> > Hello All on list
>> >
>> > I am doing some tests with yaffs at the moment and have a question
>> > regarding the sequence number.
>> >
>> > in the docs howyaffsworks it states
>> >
>> > Sequence Number: As each block is allocated, the file system's sequence
>> > number is incremented and each chunk
>> > in the block is marked with that sequence number. The sequence number
>> thus
>> > provides a way of organising the log
>> > in chronological order
>> >
>> > However when I am identifying items in the an image they are all
>> returning
>> > with the same sequence number
>> >
>> > Directory: ./, Size: -1, ParentID 1,ChunkID 0, ObjectID 1, SequenceID
>> 4096.
>> > Directory: .//test3, Size: -1, ParentID 1,ChunkID 0, ObjectID 257,
>> > SequenceID 4096.
>> > Filename: test2.txt, Size: 10, ParentID 257,ChunkID 1, ObjectID 258,
>> > SequenceID 4096.
>> > Filename: test, Size: 9, ParentID 1,ChunkID 1, ObjectID 259, SequenceID
>> > 4096.
>> > Filename: test4.txt, Size: 11, ParentID 1,ChunkID 1, ObjectID 260,
>> > SequenceID 4096.
>> > Directory: .//test5, Size: -1, ParentID 1,ChunkID 0, ObjectID 261,
>> > SequenceID 4096.
>> > Filename: test7.txt, Size: 11, ParentID 261,ChunkID 1, ObjectID 262,
>> > SequenceID 4096.
>>
>> Where did the image come from?
>> The sequence Id increments on a block basis.
>> How many blocks are there in the image you are working with?
>>
>> >
>> > I have based my code on wunyaffs which uses unyaffs from googlecode.
>> >
>> > I would have thought each chunk received a unique sequence number but it
>> > looks like it is block?.
>>
>> No, as you quote above, the sequence number increments on a block basis.
>>
>> The chunks in a block are written sequentially, therefore we can always
>> figure
>> out the order of a chunk by using the combination of sequence Id and chunk
>> offset in block.
>>
>> -- Charles
>>
>>
>>
>>
>>
>>
>>
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