On 2018年05月15日 18:36, Nikolay Borisov wrote:
>
>
> On 15.05.2018 11:48, Qu Wenruo wrote:
> <SNIP>
>
>>>>>
>>>>>
>>>>> static inline int inode_need_compress(struct inode *inode, u64 start, u64
>>>>> end)
>>>>> {
>>>>>
>>>>> struct btrfs_fs_info *fs_info =trfs_sb(inode->i_sb);
>>>>>
>>>>>
>>>>>
>>>>> /* defrag ioctl */
>>>>>
>>>>> if (BTRFS_I(inode)->defrag_compress)
>>>>>
>>>>> return 1;
>>>>>
>>>>> /* bad compression ratios */
>>>>>
>>>>> if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS)
>>>>>
>>>>> return 0;
>>>>>
>>>>
>>>> Not exactly.
>>>> Force-compress should less us bypass bad compression ratio, so it should
>>>> be at least before ratio check.
>
> Fair enough, what prompted me in suggesting this is that perhaps the
> check for BTRFS_INODE_NOCOMPRESS should be somwhere at the top of the
> function (alongside the newly added two checks for inode flags), no ?
> INODE_NOCOMPRESS can be set via icotl not necessarily only due to bad
> compression ratio.
This is much trickier than expected.
The point here is, what's the correct behavior for compress-force.
Should it override manually set NOCOMPRESS?
Unfortunately I have no idea at all.
So I can only leave it as is for now.
Thanks,
Qu
>
>>>>
>>>> Thanks,
>>>> Qu
>>>>
>>>>> /* force compress */
>>>>>
>>>>> if (btrfs_test_opt(fs_info, FORCE_COMPRESS))
>>>>>
>>>>> return 1;
>>>>>
>>>>> if (btrfs_test_opt(fs_info, COMPRESS) ||
>>>>>
>>>>> BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS ||
>>>>>
>>>>> BTRFS_I(inode)->prop_compress)
>>>>>
>>>>> return btrfs_compress_heuristic(inode, start, end);
>>>>>
>>>>> return 0;
>>>>>
>>>>> }
>
>>
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