filefrag(8) [centos man page]

FILEFRAG(8)						      System Manager's Manual						       FILEFRAG(8)

NAME

       filefrag - report on file fragmentation

SYNOPSIS

       filefrag [ -bblocksize ] [ -BeksvxX ] [ files...  ]

DESCRIPTION

       filefrag  reports  on  how badly fragmented a particular file might be.	It makes allowances for indirect blocks for ext2 and ext3 filesys-
       tems, but can be used on files for any filesystem.

       The filefrag program initially attempts to get the extent information using FIEMAP ioctl which is more efficient and faster.  If FIEMAP	is
       not supported then filefrag will fall back to using FIBMAP.

OPTIONS

       -B     Force the use of the older FIBMAP ioctl instead of the FIEMAP ioctl for testing purposes.

       -bblocksize
	      Use  blocksize  in  bytes  for  output instead of the filesystem blocksize.  For compatibility with earlier versions of filefrag, if
	      blocksize is unspecified it defaults to 1024 bytes.

       -e     Print output in extent format, even for block-mapped files.

       -k     Use 1024-byte blocksize for output (identical to '-b 1024').

       -s     Sync the file before requesting the mapping.

       -v     Be verbose when checking for file fragmentation.

       -x     Display mapping of extended attributes.

       -X     Display extent block numbers in hexadecimal format.

AUTHOR

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

E2fsprogs version 1.42.9					   December 2013						       FILEFRAG(8)

DUMPE2FS(8)						      System Manager's Manual						       DUMPE2FS(8)

NAME

       dumpe2fs - dump ext2/ext3/ext4 filesystem information

SYNOPSIS

       dumpe2fs [ -bfhixV ] [ -o superblock=superblock ] [ -o blocksize=blocksize ] device

DESCRIPTION

       dumpe2fs prints the super block and blocks group information for the filesystem present on device.

       dumpe2fs is similar to Berkeley's dumpfs program for the BSD Fast File System.

OPTIONS

       -b     print the blocks which are reserved as bad in the filesystem.

       -o superblock=superblock
	      use  the	block  superblock  when  examining the filesystem.  This option is not usually needed except by a filesystem wizard who is
	      examining the remains of a very badly corrupted filesystem.

       -o blocksize=blocksize
	      use blocks of blocksize bytes when examining the filesystem.  This option is not usually needed except by a filesystem wizard who is
	      examining the remains of a very badly corrupted filesystem.

       -f     force  dumpe2fs to display a filesystem even though it may have some filesystem feature flags which dumpe2fs may not understand (and
	      which can cause some of dumpe2fs's display to be suspect).

       -h     only display the superblock information and not any of the block group descriptor detail information.

       -i     display the filesystem data from an image file created by e2image, using device as the pathname to the image file.

       -x     print the detailed group information block numbers in hexadecimal format

       -V     print the version number of dumpe2fs and exit.

BUGS

       You need to know the physical filesystem structure to understand the output.

AUTHOR

       dumpe2fs was written by Remy Card <Remy.Card@linux.org>.  It is currently being maintained by Theodore Ts'o <tytso@alum.mit.edu>.

AVAILABILITY

       dumpe2fs is part of the e2fsprogs package and is available from http://e2fsprogs.sourceforge.net.

SEE ALSO

       e2fsck(8), mke2fs(8), tune2fs(8)

E2fsprogs version 1.41.14					   December 2010						       DUMPE2FS(8)