Virtual File System Operations
The following topic provides entry points specified by the virtual file system interface for performing operations on vfs structures.
The following entry points are specified by the virtual file system interface for performing operations on vfs structures:
| Entry Point | Description |
|---|---|
| vfs_aclxcntl | Issues ACL related control operations for a file system. |
| vfs_cntl | Issues control operations for a file system. |
| vfs_init | Initializes a virtual file system. |
| vfs_mount | Mounts a virtual file system. |
| vfs_root | Finds the root v-node of a virtual file system. |
| vfs_statfs | Obtains virtual file system statistics. |
| vfs_sync | Forces file system updates to permanent storage. |
| vfs_umount | Unmounts a virtual file system. |
| vfs_vget | Gets the v-node corresponding to a file identifier. |
The following entry points are specified by the Virtual File System interface for performing operations on v-node structures:
| Entry Point | Description |
|---|---|
| vnop_access | Tests a user's permission to access a file. |
| vnop_close | Releases the resources associated with a v-node. |
| vnop_create | Creates and opens a new file. |
| vnop_create_attr | Creates and opens a new file with initial attributes. |
| vnop_fclear | Releases portions of a file (by zeroing bytes). |
| vnop_fid | Builds a file identifier for a v-node. |
| vnop_finfo | Returns pathconf information about a file or file system. |
| vnop_fsync | Flushes in-memory information and data to permanent storage. |
| vnop_fsync_range | Flushes in-memory information and data for a given range to permanent storage. |
| vnop_ftrunc | Decreases the size of a file. |
| vnop_getacl | Gets information about access control, by retrieving the access control list. |
| vnop_getattr | Gets the attributes of a file. |
| vnop_getxacl | Gets information about access control by retrieving the ACL. Provides an advanced interface when compared to vnop_getacl. |
| vnop_hold | Assures that a v-node is not destroyed, by incrementing the v-node's use count. |
| vnop_ioctl | Performs miscellaneous operations on devices. |
| vnop_link | Creates a new directory entry for a file. |
| vnop_lockctl | Sets, removes, and queries file locks. |
| vnop_lookup | Finds an object by name in a directory. |
| vnop_map | Associates a file with a memory segment. |
| vnop_map_lloff | Associates a file with a memory segment using 64 bit offset. |
| vnop_memcntl | Manages physical attachment of a file. |
| vnop_mkdir | Creates a directory. |
| vnop_mknod | Creates a file of arbitrary type. |
| vnop_open | Gets read and/or write access to a file. |
| vnop_rdwr | Reads or writes a file. |
| vnop_rdwr_attr | Reads or writes a file and returns attributes. |
| vnop_readdir | Reads directory entries in standard format. |
| vnop_readdir_eofp | Reads directories and returns end of file indication. |
| vnop_readlink | Reads the contents of a symbolic link. |
| vnop_rele | Releases a reference to a virtual node (v-node). |
| vnop_remove | Unlinks a file or directory. |
| vnop_rename | Renames a file or directory. |
| vnop_revoke | Revokes access to an object. |
| vnop_rmdir | Removes a directory. |
| vnop_seek | Moves the current offset in a file. |
| vnop_select | Polls a v-node for pending I/O. |
| vnop_setacl | Sets information about access control for a file. |
| vnop_setattr | Sets attributes of a file. |
| vnop_setxacl | Sets information about access control for a file. Provides an advanced interface compared to vnop_setacl. |
| vnop_strategy | Reads or writes blocks of a file. |
| vnop_symlink | Creates a symbolic link. |
| vnop_unmap | Destroys a file or memory association. |