Converts a file identifier into a virtual node (v-node).
| Item | Description |
|---|---|
| vfsp | Points to the virtual file system that is to contain the v-node. Any returned v-node should belong to this virtual file system. |
| vpp | Points
to the place to return the v-node pointer. This is
set to point to the new v-node. The fields in this v-node should be
set as follows:
|
| fidp | Points to a file identifier. This is a file system-specific
file identifier that must conform to the fileid structure.
Note: If the fidp parameter is invalid, the vpp parameter
should be set to a null value by the vfs_vget entry point.
|
| crp | Points to the cred structure. This structure contains data that the file system can use to validate access permission. |
The vfs_vget entry point is called to convert a file identifier into a v-node. This entry point uses information in the vfsp and fidp parameters to create a v-node or attach to an existing v-node. This v-node represents, logically, the same file system object as the file identified by the fidp parameter.
If the v-node already exists, successful operation of this entry point increments the v-node use count and returns a pointer to the v-node. If the v-node does not exist, the vfs_vget entry point creates it using the vn_get kernel service and returns a pointer to the new v-node.
The vfs_vget entry point can be called from the process environment only.
| Item | Description |
|---|---|
| 0 | Indicates success. |
Nonzero return values are returned from the /usr/include/sys/errno.h file to indicate failure. A typical value includes:
| Item | Description |
|---|---|
| EINVAL | Indicates that the remote virtual file system specified by the vfsp parameter does not support chained mounts. |
The vn_get kernel service.
The access subroutine.
Virtual File System Overview, Virtual File System Kernel Extensions Overview, Logical File System Overview, Understanding Virtual Nodes (V-nodes) in AIX® Version 7.1 Kernel Extensions and Device Support Programming Concepts.