NAME
gfs_pio_set_view_index - change file view to an individual fragment
SYNOPSIS
#include <gfarm/gfarm.h>
char *gfs_pio_set_view_index (GFS_File gf, int fragment_number, int
fragment_index, char *host, int flags);
DESCRIPTION
gfs_pio_set_view_index() changes the process’s view of the data in the
file specified by gf to a file fragment with the index fragment_index.
When creating a new file, it is necessary to specify the total number
of file fragments fragment_number. Every parallel process should
specify the same fragment_number for the corresponding file. When the
file exists, GFARM_FILE_DONTCARE can be specified. If fragment_number
is different from the total fragment number of the existent file, it is
erroneous.
host is used for explicitly specifying a filesystem node. If host is
NULL, appropriate filesystem node is chosen.
Values of flag are constructed by a bitwise-inclusive-OR of the
following list.
GFARM_FILE_SEQUENTIAL
File will be accessed sequentially.
GFARM_FILE_REPLICATE
File may be replicated to a local filesystem when accessing
remotely. This flag cannot be specified with
GFARM_FILE_NOT_REPLICATE.
GFARM_FILE_NOT_REPLICATE
File may not be replicated to a local filesystem when accessing
remotely. This flag cannot be specified with
GFARM_FILE_REPLICATE.
By default, Gfarm files are accessed as a whole file in global file
view where each fragment can be seamlessly accessed.
RETURN VALUES
NULL The function terminated successfully.
GFARM_ERR_NO_MEMORY
Insufficient memory was available.
GFARM_ERR_OPERATION_NOT_PERMITTED
The file is not a regular fragmented file.
GFARM_ERR_FRAGMENT_NUMBER_DOES_NOT_MATCH
The total number of file fragments is different from the
existence one.
GFARM_ERR_INVALID_ARGUMENT
Invalid arguments are specified, for instance,
GFARM_FILE_DONTCARE is specified as the total number of
fragments of a newly created file.
Others An error except the above occurred. The reason is shown by its
pointed strings.
SEE ALSO
gfs_pio_create(3), gfs_pio_open(3), gfs_pio_set_view_local(3)