[PATCH v6 0/4] fat: additions to support fat_fallocate

[Namjae Jeon]

This patch set provides support for doing fallocate operation
on FAT filesystem.

v6:
- Remove usage of i_disksize
- Align all fallocate code sequence to use i_blocks as
this is more or less can be used to denote the on-disksize.
Also, i_blocks is common in update path of cluster allocation via.
fat_chain_add() both from normal write path and fallocate() operation

v5:
- change all routines to make ->i_disksize aligned by cluster size.
- merge fat_bmap2() and fat_get_block_bmap().

v4:
- ->i_disksize is aligned by block size in fill_inode.
- use i_disksize when computing the number of cluster for fallocate.
- make fat_get_block_bmap to avoid race issue.
- use __fat_write_inode() with inode_needs_sync() in evict.

v3:
- fix i_disksize and mmu_private comments(uninit/initialized)
- remove unneeded condition in fat_bmap.
- use mmu_private instead of fclus in fat_fallocate.
- make function mark buffer new for block in fallocated region.
- use flags for bmap.
- use mmu_private instead of i_size in direct_IO.
- use flags and remove i_mutex in bmap.
- update vfat documentation.

v2:
- remove a stary unlock(from Dan Carpenter)
- check ->mmu_private and ->i_disksize to truncate uninitialized data.

Namjae Jeon (4):
fat: add fat_fallocate operation
fat: skip cluster allocation on fallocated region
fat: permit to return phy block number by fibmap in fallocated region
Documentation/filesystems/vfat.txt: update the limitation for fat
fallocate

[OGAWA Hirofumi]

Post by Namjae Jeon
This patch set provides support for doing fallocate operation
on FAT filesystem.

I'm still not reviewing deeply though, basically looks like good to
me. But I'm still not testing this one at all, sorry.

If not tested yet, we would be able to start test, e.g. stress.

Thanks.

Post by Namjae Jeon
- Remove usage of i_disksize
- Align all fallocate code sequence to use i_blocks as
this is more or less can be used to denote the on-disksize.
Also, i_blocks is common in update path of cluster allocation via.
fat_chain_add() both from normal write path and fallocate() operation
- change all routines to make ->i_disksize aligned by cluster size.
- merge fat_bmap2() and fat_get_block_bmap().
- ->i_disksize is aligned by block size in fill_inode.
- use i_disksize when computing the number of cluster for fallocate.
- make fat_get_block_bmap to avoid race issue.
- use __fat_write_inode() with inode_needs_sync() in evict.
- fix i_disksize and mmu_private comments(uninit/initialized)
- remove unneeded condition in fat_bmap.
- use mmu_private instead of fclus in fat_fallocate.
- make function mark buffer new for block in fallocated region.
- use flags for bmap.
- use mmu_private instead of i_size in direct_IO.
- use flags and remove i_mutex in bmap.
- update vfat documentation.
- remove a stary unlock(from Dan Carpenter)
- check ->mmu_private and ->i_disksize to truncate uninitialized data.
fat: add fat_fallocate operation
fat: skip cluster allocation on fallocated region
fat: permit to return phy block number by fibmap in fallocated region
Documentation/filesystems/vfat.txt: update the limitation for fat
fallocate