>> + while (index < end) {
>> + ret = shmem_getpage(inode, index, &page, SGP_WRITE, NULL);
>
> If the 'page' for index exists before this call, this will return the page without
> allocaton.
>
> Then, the page may not be zero-cleared. I think the page should be zero-cleared.
No. fallocate shouldn't destroy existing data. It only ensure
subsequent file access don't make ENOSPC error.
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