# fsck.ext4 -fn /dev/sdb2

e2fsck 1.42.9 (4-Feb-2014)
Warning!  /dev/sdb2 is mounted.
Warning: skipping journal recovery because doing a read-only filesystem check.
Pass 1: Checking inodes, blocks, and sizes
Deleted inode 524292 has zero dtime.  Fix? no

Inodes that were part of a corrupted orphan linked list found.  Fix? no

Inode 524293 was part of the orphaned inode list.  IGNORED.
Inode 524294 was part of the orphaned inode list.  IGNORED.
Inode 524299 was part of the orphaned inode list.  IGNORED.
Inode 524300 was part of the orphaned inode list.  IGNORED.
Inode 524301 was part of the orphaned inode list.  IGNORED.
Inode 524302 was part of the orphaned inode list.  IGNORED.
Inode 524310 was part of the orphaned inode list.  IGNORED.
Inode 524321 was part of the orphaned inode list.  IGNORED.
Inode 524322 was part of the orphaned inode list.  IGNORED.
Inode 524325 was part of the orphaned inode list.  IGNORED.
Inode 2492565 was part of the orphaned inode list.  IGNORED.
Inode 2622677 was part of the orphaned inode list.  IGNORED.
Inode 2622678 was part of the orphaned inode list.  IGNORED.
Inode 2883748 was part of the orphaned inode list.  IGNORED.
Inode 2884069 was part of the orphaned inode list.  IGNORED.
Inode 2885175 was part of the orphaned inode list.  IGNORED.
Pass 2: Checking directory structure
Entry 'Default_keyring.keyring' in /home/vlastimil/.local/share/keyrings (2495478) has deleted/unused inode 2498649.  Clear? no

Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Unattached inode 2491790
Connect to /lost+found? no

Pass 5: Checking group summary information
Block bitmap differences:  -(34281--34303) -11650577 -(11650579--11650580) -11650591 -(11650594--11650595) -(13270059--13270073) -(13272582--13272583) -(20542474--20542475) +(26022912--26023347) -(26029568--26030003)
Fix? no

Free blocks count wrong (14476802, counted=14476694).
Fix? no

Inode bitmap differences:  -(524292--524294) -(524299--524302) -524310 -(524321--524322) -524325 +2491790 -2492565 -2498649 -(2622677--2622678) -2883748 -2884069 -2885175
Fix? no

Free inodes count wrong (7371936, counted=7371916).
Fix? no


/dev/sdb2: ********** WARNING: Filesystem still has errors **********

/dev/sdb2: 443232/7815168 files (0.1% non-contiguous), 16757502/31234304 blocks

# touch /forcefsck

# fsck.ext4 -n /dev/sdb2

e2fsck 1.42.9 (4-Feb-2014)
Warning!  /dev/sdb2 is mounted.
Warning: skipping journal recovery because doing a read-only filesystem check.
/dev/sdb2: clean, 443232/7815168 files, 16757502/31234304 blocks