On 2019/5/28 10:36, Gao Xiang wrote:
> For compressed files, i_blocks should not be calculated
> by using i_size. i_u.compressed_blocks is used instead.
>
> In addition, i_blocks was miscalculated for non-compressed
> files previously, fix it as well.
>
> Signed-off-by: Gao Xiang <gaoxiang25@xxxxxxxxxx>
> ---
> change log v2:
> - fix description in commit message
> - fix to 'inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK'
>
> Thanks,
> Gao Xiang
>
> drivers/staging/erofs/inode.c | 14 ++++++++++++--
> 1 file changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
> index 8da144943ed6..6e67e018784e 100644
> --- a/drivers/staging/erofs/inode.c
> +++ b/drivers/staging/erofs/inode.c
> @@ -20,6 +20,7 @@ static int read_inode(struct inode *inode, void *data)
> struct erofs_vnode *vi = EROFS_V(inode);
> struct erofs_inode_v1 *v1 = data;
> const unsigned int advise = le16_to_cpu(v1->i_advise);
> + erofs_blk_t nblks = 0;
>
> vi->data_mapping_mode = __inode_data_mapping(advise);
>
> @@ -60,6 +61,10 @@ static int read_inode(struct inode *inode, void *data)
> le32_to_cpu(v2->i_ctime_nsec);
>
> inode->i_size = le64_to_cpu(v2->i_size);
> +
> + /* total blocks for compressed files */
> + if (vi->data_mapping_mode == EROFS_INODE_LAYOUT_COMPRESSION)
> + nblks = v2->i_u.compressed_blocks;
Xiang,
It needs to use le32_to_cpu(). ;)
> } else if (__inode_version(advise) == EROFS_INODE_LAYOUT_V1) {
> struct erofs_sb_info *sbi = EROFS_SB(inode->i_sb);
>
> @@ -90,6 +95,8 @@ static int read_inode(struct inode *inode, void *data)
> sbi->build_time_nsec;
>
> inode->i_size = le32_to_cpu(v1->i_size);
> + if (vi->data_mapping_mode == EROFS_INODE_LAYOUT_COMPRESSION)
> + nblks = v1->i_u.compressed_blocks;
Ditto.
Thanks,
> } else {
> errln("unsupported on-disk inode version %u of nid %llu",
> __inode_version(advise), vi->nid);
> @@ -97,8 +104,11 @@ static int read_inode(struct inode *inode, void *data)
> return -EIO;
> }
>
> - /* measure inode.i_blocks as the generic filesystem */
> - inode->i_blocks = ((inode->i_size - 1) >> 9) + 1;
> + if (!nblks)
> + /* measure inode.i_blocks as generic filesystems */
> + inode->i_blocks = roundup(inode->i_size, EROFS_BLKSIZ) >> 9;
> + else
> + inode->i_blocks = nblks << LOG_SECTORS_PER_BLOCK;
> return 0;
> }
>
>
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