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.