LFS_MARKV(2) | System Calls Manual | LFS_MARKV(2) |
lfs_markv
—
#include <sys/types.h>
#include <ufs/lfs/lfs.h>
int
lfs_markv
(fsid_t
*fsidp, BLOCK_INFO
*blkiov, int
blkcnt);
lfs_markv
() rewrites the blocks specified in
blkiov to new disk locations, for the purposes of
grouping them next to one another, or to move them out of a segment to clean
it. All fields of the BLOCK_INFO structure must be filled in, except for
bi_segcreate. If bi_daddr is not
the correct current address for logical block bi_lbn of
the file with inode number bi_inode, or if the file's
version number does not match bi_version, the block will
not be written to disk, but no error will be returned.
The fsidp argument contains the id of the file system to which the inodes and blocks belong. The bi_bp field contains bi_size bytes of data to be written into the appropriate block. If bi_lbn is specified as LFS_UNUSED_LBN, the inode itself will be rewritten.
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;
lfs_markv
() returns 0 on success, or -1 on error.
lfs_markv
() indicates:
lfs_markv
() function call appeared in
4.4BSD.
lfs_markv
() does not really belong
in user space. Among other things it could be used to work around the
SF_IMMUTABLE and SF_APPEND file flags (see
chflags(2)).
May 23, 2000 | NetBSD 9.2 |