Namjae Jeon <namjae.jeon@xxxxxxxxxxx> writes:
> Skip new cluster allocation after checking i_blocks limit in _fat_get_block,
> because the blocks are already allocated in fallocated region.
>
> Signed-off-by: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
> Signed-off-by: Amit Sahrawat <a.sahrawat@xxxxxxxxxxx>
> ---
> fs/fat/inode.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/fs/fat/inode.c b/fs/fat/inode.c
> index acb45ce..20e9fe5 100644
> --- a/fs/fat/inode.c
> +++ b/fs/fat/inode.c
> @@ -144,7 +144,12 @@ static inline int __fat_get_block(struct inode *inode, sector_t iblock,
> }
>
> offset = (unsigned long)iblock & (sbi->sec_per_clus - 1);
> - if (!offset) {
> + /*
> + * allocate a cluster according to the following.
> + * 1) no more available blocks
> + * 2) not part of fallocate region
> + */
> + if (!offset && !(iblock < (sector_t)inode->i_blocks)) {
> /* TODO: multiple cluster allocation would be desirable. */
> err = fat_add_cluster(inode);
> if (err)
iblock and i_blocks have different unit. iblock == s_blocksize,
i_blocks == 9 alwasy.
--
OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
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