> - open(O_RDWR) > - ioctl(FS_IOC_SETFLAGS, F2FS_COMPR_FL) > - write() > - ioctl(RELEASE_COMPRESS_BLOCKS) -- inode is immutable now > - ioctl(FS_IOC_SETFLAGS, ~F2FS_COMPR_FL) -- Should we allow to update > immutable inode? > as we know, normally, immutable inode should deny open(O_WRONLY or O_RDWR) > and later update. >
For this case, with this patch we'll return -EINVAL for ioctl(FS_IOC_SETFLAGS, ~F2FS_COMPR_FL). I thought RESERVE_COMPRESS_BLOCKS ioctl is always required to get the file to normal mode after RELEASE_COMPRESS_BLOCKS is called.
