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AIX Version 4.3 Kernel and Subsystems Technical Reference, Volume 1
gfsadd Kernel Service
Purpose
Adds a file system type to the gfs
table.
Syntax
#include <sys/types.h>
#include <sys/errno.h>
int gfsadd (
gfsno,
gfsp)
int gfsno;
struct gfs *gfsp;
Parameters
| gfsno |
Specifies the file system number. This small integer value is either
defined in the /usr/include/sys/vmount.h file or a user-defined number of
the same order. |
| gfsp |
Points to the file system description structure. |
Description
The gfsadd kernel service is used during
configuration of a file system. The configuration routine for a file system
invokes the gfsadd kernel service with a
gfs structure. This structure describes the file system type.
The gfs structure type is defined in the
/usr/include/sys/gfs.h file. The gfs structure must have the
following fields filled in:
| gfs_type |
Specifies the integer type value. The predefined types are listed in
the /usr/include/sys/vmount.h file. |
| gfs_name |
Specifies the character string name of the file system. The maximum
length of
this field is 16 bytes. Shorter names must be null-padded. |
| gfs_flags |
Specifies the flags that define the capabilities of the file system. The
following flag values are defined:
| GFS_SYS5DIR |
File system that uses the System V-type directory structure. |
| GFS_REMOTE |
File system is remote (ie. NFS). |
| GFS_FUMNT |
File system supports forced unmount. |
| GFS_NOUMASK |
File system applies umask when creating new objects. |
| GFS_VERSION4 |
File system supports AIX Version 4 V-node interface. |
| GFS_VERSION42 |
File system supports AIX Version 4.2 V-node interface. (new vnode op:
vn_seek) |
| GFS_VERSION421 |
File system supports AIX Version 4.2.1 V-node interface.(new vnode ops:
vn_sync_range, vn_create_attr, vn_finfo, vn_map_lloff, vn_readdir_eofp,
vn_rdwr_attr)) |
| GFS_VERSION43 |
File system supports AIX Version 4.3 V-node interface. (new file flag for
vn_sync_range:FMSYNC) |
|
| gfs_ops |
Specifies the array of pointers to vfs operation
implementations. |
| gn_ops |
Specifies the array of pointers to v-node
operation
implementations. |
The file system description structure can also
specify:
| gfs_init |
Points to an initialization routine to be called by the gfsadd
kernel
service. This field must be null if no initialization routine is to be
called. |
| gfs_data |
Points to file system private data. |
The gfsadd kernel service can be
called
from the
process
environment only.
Return Values
| 0 |
Indicates successful completion. |
| EBUSY |
Indicates that the file system type has already been installed. |
| EINVAL |
Indicates that the gfsno value is larger than the
system-defined
maximum.
The system-defined maximum is indicated in the /usr/include/sys/vmount.h file. |
Implementation Specifics
The gfsadd kernel service is part
of Base
Operating System (BOS) Runtime.
Related Information
The gfsdel
kernel service.
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