Re: [PATCH v3 1/6] fat: add i_disksize to represent uninitialized size

From: OGAWA Hirofumi
Date: Tue Feb 04 2014 - 09:52:47 EST

OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx> writes:

>>> Don't we need to update ->i_disksize after cont_write_begin()?
>> We don't need to update i_disksize after cont_write_begin.
>> It is taken care by the fat_get_block after the allocation.
>> For all write paths we align the mmu_private and i_disksize from
>> fat_fill_inode and fat_get_block.
> fat_fill_inode() just set i_disksize to i_size. So, it is not aligned by
> cluster size or block size.
> E.g. ->mmu_private = 500. Then, cont_write_begin() can set ->mmu_private
> to 512 on some case. In this case, fat_get_block() will not be called,
> because no new allocation.
> If this is true, it would be possible to have ->mmu_private == 512 and
> ->i_disksize == 500.
> I'm missing something?

BTW, even if above was right, I'm not checking whether updating
->i_disksize after cont_write_begin() is right fix or not.
OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
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