bmap(9) [centos man page]

BMAP(9) 							   The Linux VFS							   BMAP(9)

NAME

       bmap - find a block number in a file

SYNOPSIS

       sector_t bmap(struct inode * inode, sector_t block);

ARGUMENTS

       inode
	   inode of file

       block
	   block to find

DESCRIPTION

       Returns the block number on the device holding the inode that is the disk block number for the block of the file requested. That is, asked
       for block 4 of inode 1 the function will return the disk block relative to the disk start that holds that block of the file.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014								   BMAP(9)

DUMPLFS(8)						    BSD System Manager's Manual 						DUMPLFS(8)

NAME

     dumplfs -- dump file system information

SYNOPSIS

     dumplfs [-adiS] [-b blkno] [-I blkno] [-s segno] filesys | device

DESCRIPTION

     dumplfs prints out the file system layout information for the LFS file system or special device specified.  The listing is very long and
     detailed.	This command is useful mostly for finding out certain file system information such as the file system block size.

     The following flags are interpreted by dumplfs.

     -a      Dump the contents of all superblocks, not just the first.	Superblocks appear in the dumplfs output with the segment containing them.

     -b      Use the block specified immediately after the flag as the super block for the filesystem.

     -d      Check partial segment data checksums and report mismatches.  This makes dumplfs operate much more slowly.

     -I      Use the block specified immediately after the flag as the inode block containing the index file inode.

     -i      Dump information about the inode free list.

     -S      Dump information about the segment table.

     -s      Add the segment number immediately following the flag to a list of segments to dump.  This flag may be specified more than once to
	     dump more than one segment.  The default is to dump all segments.

SEE ALSO

     disktab(5), fs(5), disklabel(8), newfs_lfs(8)

HISTORY

     The dumplfs command appeared in 4.4BSD.

BSD
								   June 13, 2000							       BSD