Provided by: e2fsprogs_1.44.1-1_amd64 bug

NAME

       resize2fs - ext2/ext3/ext4 file system resizer

SYNOPSIS

       resize2fs  [  -fFpPMbs  ]  [ -d debug-flags ] [ -S RAID-stride ] [ -z undo_file ] device [
       size ]

DESCRIPTION

       The resize2fs program will resize ext2, ext3, or ext4 file systems.  It  can  be  used  to
       enlarge  or  shrink  an  unmounted  file  system  located on device.  If the filesystem is
       mounted, it can be used to expand the size of the mounted filesystem, assuming the  kernel
       and the file system supports on-line resizing.  (Modern Linux 2.6 kernels will support on-
       line resize for file systems mounted using ext3 and ext4; ext3 file systems  will  require
       the use of file systems with the resize_inode feature enabled.)

       The  size  parameter  specifies the requested new size of the filesystem.  If no units are
       specified, the units of the size parameter  shall  be  the  filesystem  blocksize  of  the
       filesystem.   Optionally,  the  size parameter may be suffixed by one of the following the
       units designators: 's', 'K', 'M', or 'G', for 512 byte sectors, kilobytes,  megabytes,  or
       gigabytes,  respectively.  The size of the filesystem may never be larger than the size of
       the partition.  If size parameter is not specified, it will default to  the  size  of  the
       partition.

       Note: when kilobytes is used above, I mean real, power-of-2 kilobytes, (i.e., 1024 bytes),
       which some politically correct folks insist should be the  stupid-sounding  ``kibibytes''.
       The same holds true for megabytes, also sometimes known as ``mebibytes'', or gigabytes, as
       the amazingly silly ``gibibytes''.  Makes you want to gibber, doesn't it?

       The resize2fs program does not manipulate the size of partitions.  If you wish to  enlarge
       a  filesystem,  you  must  make  sure  you can expand the size of the underlying partition
       first.  This can be done using fdisk(8) by deleting the partition and recreating it with a
       larger size or using lvextend(8), if you're using the logical volume manager lvm(8).  When
       recreating the partition, make sure you create it with the same starting disk cylinder  as
       before!   Otherwise,  the  resize operation will certainly not work, and you may lose your
       entire filesystem.  After running fdisk(8), run resize2fs to resize the ext2 filesystem to
       use all of the space in the newly enlarged partition.

       If  you  wish  to  shrink  an  ext2  partition,  first use resize2fs to shrink the size of
       filesystem.  Then you may use  fdisk(8)  to  shrink  the  size  of  the  partition.   When
       shrinking  the  size  of  the partition, make sure you do not make it smaller than the new
       size of the ext2 filesystem!

       The -b and -s options enable and disable the 64bit feature, respectively.   The  resize2fs
       program  will,  of  course,  take  care of resizing the block group descriptors and moving
       other data blocks out of the way, as needed.  It is not possible to resize the  filesystem
       concurrent with changing the 64bit status.

OPTIONS

       -b     Turns  on  the 64bit feature, resizes the group descriptors as necessary, and moves
              other metadata out of the way.

       -d debug-flags
              Turns on various resize2fs debugging features, if they have been compiled into  the
              binary.   debug-flags  should  be  computed  by  adding  the numbers of the desired
              features from the following list:
                   2    - Debug block relocations
                   4    - Debug inode relocations
                   8    - Debug moving the inode table
                   16   - Print timing information
                   32   - Debug minimum filesystem size (-M) calculation

       -f     Forces resize2fs to proceed with the filesystem resize operation,  overriding  some
              safety checks which resize2fs normally enforces.

       -F     Flush  the  filesystem device's buffer caches before beginning.  Only really useful
              for doing resize2fs time trials.

       -M     Shrink the file system to minimize its size as much as possible,  given  the  files
              stored in the file system.

       -p     Prints  out  a  percentage  completion  bars for each resize2fs operation during an
              offline resize, so that the user can keep track of what the program is doing.

       -P     Print an estimate of the number of file system blocks in the file system if  it  is
              shrunk using resize2fs's -M option and then exit.

       -s     Turns off the 64bit feature and frees blocks that are no longer in use.

       -S RAID-stride
              The  resize2fs  program  will  heuristically  determine  the  RAID  stride that was
              specified when the  filesystem  was  created.   This  option  allows  the  user  to
              explicitly specify a RAID stride setting to be used by resize2fs instead.

       -z undo_file
              Before  overwriting  a file system block, write the old contents of the block to an
              undo file.  This undo file can be used with e2undo(8) to restore the  old  contents
              of the file system should something go wrong.  If the empty string is passed as the
              undo_file argument, the undo file will  be  written  to  a  file  named  resize2fs-
              device.e2undo  in  the  directory  specified via the E2FSPROGS_UNDO_DIR environment
              variable.

              WARNING: The undo file cannot be used to recover from a power or system crash.

KNOWN BUGS

       The minimum size of the filesystem as estimated by resize2fs may be incorrect,  especially
       for filesystems with 1k and 2k blocksizes.

AUTHOR

       resize2fs was written by Theodore Ts'o <tytso@mit.edu>.

COPYRIGHT

       Resize2fs  is  Copyright  1998 by Theodore Ts'o and PowerQuest, Inc.  All rights reserved.
       As of April, 2000 Resize2fs may be redistributed under the terms of the GPL.

SEE ALSO

       fdisk(8), e2fsck(8), mke2fs(8), lvm(8), lvextend(8)