bmap(9) [suse 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 2.6.					     July 2010								   BMAP(9)

LFS_BMAPV(2)						      BSD System Calls Manual						      LFS_BMAPV(2)

NAME

     lfs_bmapv -- retrieve disk addresses for arrays of blocks

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/types.h>
     #include <ufs/lfs/lfs.h>

     int
     lfs_bmapv(fsid_t *fsidp, BLOCK_INFO *blkiov, int blkcnt);

DESCRIPTION

     lfs_bmapv() fills in the bi_daddr field for every block listed in the block array blkiov with the disk address corresponding to the logical
     block bi_lbn of the file with inode bi_inode.  If bi_lbn is LFS_UNUSED_LBN, the disk location of the inode block containing the file's inode
     will be returned in bi_daddr instead.

     The fsidp argument contains the id of the file system to which the inodes and blocks belong.  The blkiov argument is an array of BLOCK_INFO
     structures (see below).  The blkcnt argument determines the size of the blkiov array.

     typedef struct block_info {
	 ino_t	     bi_inode;	   /* inode # */
	 ufs_daddr_t bi_lbn;	   /* logical block w/in file */
	 ufs_daddr_t bi_daddr;	   /* disk address of block */
	 time_t      bi_segcreate; /* origin segment create time */
	 int	     bi_version;   /* file version number */
	 void	    *bi_bp;	   /* data buffer */
	 int	     bi_size;	   /* size of the block (if fragment) */
     } BLOCK_INFO;

RETURN VALUES

     lfs_bmapv() returns 0 on success, or -1 on error.

ERRORS

     An error return from lfs_bmapv() indicates:

     [EFAULT]		fsidp points outside the process's allocated address space.

     [EINVAL]		*fsidp does not specify a valid file system.

SEE ALSO

     lfs_markv(2), lfs_segclean(2), lfs_segwait(2), lfs_cleanerd(8)

HISTORY

     The lfs_bmapv() function call appeared in 4.4BSD.

BSD
								   May 23, 2000 							       BSD