After extending the Logical volume changed size are not get reflected

Issue

• After extending the Logical volume changed size are not get reflected.
• Below are the steps done:

1) Increased size of hard disk from 50GB to 100 GB.

2) Resized the physical volume:

# pvresize --setphysicalvolumesize 100G /dev/sdb

3) lvdisplay shows logical volume is 100 GB

# lvdisplay /dev/datavg/data_lv
  --- Logical volume ---
  LV Name                /dev/datavg/data_lv
  VG Name                datavg
  LV UUID                pJUy0t-ch4P-mIG2-4PEb-HP39-r0Ur-bbCbcB
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                100.00 GiB
  Current LE             25599
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

4) But mounted file system is still 50 GB

/dev/mapper/datavg-data_lv  50G  4.7G   43G  10% /data