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? > 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 >
