Re: [PATCH v2 0/5] fat: additions to support fat_fallocate

[OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>]

Namjae Jeon <linkinjeon@gmail.com> writes:

> From: Namjae Jeon <namjae.jeon@samsung.com>
>
> This patch set provides support for doing fallocate operation
> on FAT filesystem.
> After series of review for the the feature
> The complete functionality is broken down into smaller subsets.
>
> v2:
>  - remove a stary unlock(from Dan Carpenter)
>  - check ->mmu_private and ->i_disksize to truncate uninitialized data.
>
> Namjae Jeon (5):
>  fat: add i_disksize to represent uninitialized size
>  fat: add fat_fallocate operation
>  fat: zero out seek range on _fat_get_block
>  fat: fallback to buffered write in case of fallocatded region on direct IO
>  fat: permit to return phy block number by fibmap in fallocated region

Let's add document about FAT's fallocate() behavior to
Documents/filesystem/vfat.txt.

I.e. it will be truncated evict_inode(). So, user has to assume
fallocate() is only valid until last close(), and user has to re-call
fallocate() after re-open to make sure fallocate() region.
-- 
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>