On Mon, Jun 13, 2022 at 04:37:01AM +0100, Matthew Wilcox wrote: > On Mon, Jun 13, 2022 at 10:08:00AM +0800, Chao Liu wrote: > > v2: > > - s/file size/filesize/ > > Why would you change it to be wrong? > This is a suggestion from Chao Yu. Maybe he has some other considerations. Hi Chao, Can you help with this question? Thanks. > > Documentation/filesystems/f2fs.rst | 13 +++++++------ > > 1 file changed, 7 insertions(+), 6 deletions(-) > > > > diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst > > index ad8dc8c040a2..531b0f8a3946 100644 > > --- a/Documentation/filesystems/f2fs.rst > > +++ b/Documentation/filesystems/f2fs.rst > > @@ -818,10 +818,11 @@ Compression implementation > > Instead, the main goal is to reduce data writes to flash disk as much as > > possible, resulting in extending disk life time as well as relaxing IO > > congestion. Alternatively, we've added ioctl(F2FS_IOC_RELEASE_COMPRESS_BLOCKS) > > - interface to reclaim compressed space and show it to user after putting the > > - immutable bit. Immutable bit, after release, it doesn't allow writing/mmaping > > - on the file, until reserving compressed space via > > - ioctl(F2FS_IOC_RESERVE_COMPRESS_BLOCKS) or truncating filesize to zero. > > + interface to reclaim compressed space and show it to user after setting a > > + special flag to the inode. Once the compressed space is released, the flag > > + will block writing data to the file until either the compressed space is > > + reserved via ioctl(F2FS_IOC_RESERVE_COMPRESS_BLOCKS) or the filesize is > > + truncated to zero. > > > > Compress metadata layout:: > > > > @@ -830,12 +831,12 @@ Compress metadata layout:: > > | cluster 1 | cluster 2 | ......... | cluster N | > > +-----------------------------------------------+ > > . . . . > > - . . . . > > + . . . . > > . Compressed Cluster . . Normal Cluster . > > +----------+---------+---------+---------+ +---------+---------+---------+---------+ > > |compr flag| block 1 | block 2 | block 3 | | block 1 | block 2 | block 3 | block 4 | > > +----------+---------+---------+---------+ +---------+---------+---------+---------+ > > - . . > > + . . > > . . > > . . > > +-------------+-------------+----------+----------------------------+ > > -- > > 2.36.1 > >
