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- /* $NetBSD: vnode.h,v 1.38 1996/02/29 20:59:05 cgd Exp $ */
-
- /*
- * Copyright (c) 1989, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)vnode.h 8.11 (Berkeley) 11/21/94
- */
-
- #include <sys/queue.h>
-
- /*
- * The vnode is the focus of all file activity in UNIX. There is a
- * unique vnode allocated for each active file, each current directory,
- * each mounted-on file, text file, and the root.
- */
-
- /*
- * Vnode types. VNON means no type.
- */
- enum vtype { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO, VBAD };
-
- /*
- * Vnode tag types.
- * These are for the benefit of external programs only (e.g., pstat)
- * and should NEVER be inspected by the kernel.
- */
- enum vtagtype {
- VT_NON, VT_UFS, VT_NFS, VT_MFS, VT_MSDOSFS, VT_LFS, VT_LOFS, VT_FDESC,
- VT_PORTAL, VT_NULL, VT_UMAP, VT_KERNFS, VT_PROCFS, VT_AFS, VT_ISOFS,
- VT_UNION, VT_ADOSFS
- };
-
- /*
- * Each underlying filesystem allocates its own private area and hangs
- * it from v_data. If non-null, this area is freed in getnewvnode().
- */
- LIST_HEAD(buflists, buf);
-
- struct vnode {
- u_long v_flag; /* vnode flags (see below) */
- short v_usecount; /* reference count of users */
- short v_writecount; /* reference count of writers */
- long v_holdcnt; /* page & buffer references */
- daddr_t v_lastr; /* last read (read-ahead) */
- u_long v_id; /* capability identifier */
- struct mount *v_mount; /* ptr to vfs we are in */
- int (**v_op) __P((void *)); /* vnode operations vector */
- TAILQ_ENTRY(vnode) v_freelist; /* vnode freelist */
- LIST_ENTRY(vnode) v_mntvnodes; /* vnodes for mount point */
- struct buflists v_cleanblkhd; /* clean blocklist head */
- struct buflists v_dirtyblkhd; /* dirty blocklist head */
- long v_numoutput; /* num of writes in progress */
- enum vtype v_type; /* vnode type */
- union {
- struct mount *vu_mountedhere;/* ptr to mounted vfs (VDIR) */
- struct socket *vu_socket; /* unix ipc (VSOCK) */
- caddr_t vu_vmdata; /* private data for vm (VREG) */
- struct specinfo *vu_specinfo; /* device (VCHR, VBLK) */
- struct fifoinfo *vu_fifoinfo; /* fifo (VFIFO) */
- } v_un;
- struct nqlease *v_lease; /* Soft reference to lease */
- daddr_t v_lastw; /* last write (write cluster) */
- daddr_t v_cstart; /* start block of cluster */
- daddr_t v_lasta; /* last allocation */
- int v_clen; /* length of current cluster */
- int v_ralen; /* Read-ahead length */
- daddr_t v_maxra; /* last readahead block */
- long v_spare[7]; /* round to 128 bytes */
- enum vtagtype v_tag; /* type of underlying data */
- void *v_data; /* private data for fs */
- };
- #define v_mountedhere v_un.vu_mountedhere
- #define v_socket v_un.vu_socket
- #define v_vmdata v_un.vu_vmdata
- #define v_specinfo v_un.vu_specinfo
- #define v_fifoinfo v_un.vu_fifoinfo
-
- /*
- * Vnode flags.
- */
- #define VROOT 0x0001 /* root of its file system */
- #define VTEXT 0x0002 /* vnode is a pure text prototype */
- #define VSYSTEM 0x0004 /* vnode being used by kernel */
- #define VISTTY 0x0008 /* vnode represents a tty */
- #define VXLOCK 0x0100 /* vnode is locked to change underlying type */
- #define VXWANT 0x0200 /* process is waiting for vnode */
- #define VBWAIT 0x0400 /* waiting for output to complete */
- #define VALIASED 0x0800 /* vnode has an alias */
- #define VDIROP 0x1000 /* LFS: vnode is involved in a directory op */
-
- /*
- * Vnode attributes. A field value of VNOVAL represents a field whose value
- * is unavailable (getattr) or which is not to be changed (setattr).
- */
- struct vattr {
- enum vtype va_type; /* vnode type (for create) */
- u_short va_mode; /* files access mode and type */
- short va_nlink; /* number of references to file */
- uid_t va_uid; /* owner user id */
- gid_t va_gid; /* owner group id */
- long va_fsid; /* file system id (dev for now) */
- long va_fileid; /* file id */
- u_quad_t va_size; /* file size in bytes */
- long va_blocksize; /* blocksize preferred for i/o */
- struct timespec va_atime; /* time of last access */
- struct timespec va_mtime; /* time of last modification */
- struct timespec va_ctime; /* time file changed */
- u_long va_gen; /* generation number of file */
- u_long va_flags; /* flags defined for file */
- dev_t va_rdev; /* device the special file represents */
- u_quad_t va_bytes; /* bytes of disk space held by file */
- u_quad_t va_filerev; /* file modification number */
- u_int va_vaflags; /* operations flags, see below */
- long va_spare; /* remain quad aligned */
- };
-
- /*
- * Flags for va_cflags.
- */
- #define VA_UTIMES_NULL 0x01 /* utimes argument was NULL */
-
- /*
- * Flags for ioflag.
- */
- #define IO_UNIT 0x01 /* do I/O as atomic unit */
- #define IO_APPEND 0x02 /* append write to end */
- #define IO_SYNC 0x04 /* do I/O synchronously */
- #define IO_NODELOCKED 0x08 /* underlying node already locked */
- #define IO_NDELAY 0x10 /* FNDELAY flag set in file table */
-
- /*
- * Modes. Some values same as Ixxx entries from inode.h for now.
- */
- #define VSUID 04000 /* set user id on execution */
- #define VSGID 02000 /* set group id on execution */
- #define VSVTX 01000 /* save swapped text even after use */
- #define VREAD 00400 /* read, write, execute permissions */
- #define VWRITE 00200
- #define VEXEC 00100
-
- /*
- * Token indicating no attribute value yet assigned.
- */
- #define VNOVAL (-1)
-
- #ifdef _KERNEL
- /*
- * Convert between vnode types and inode formats (since POSIX.1
- * defines mode word of stat structure in terms of inode formats).
- */
- extern enum vtype iftovt_tab[];
- extern int vttoif_tab[];
- #define IFTOVT(mode) (iftovt_tab[((mode) & S_IFMT) >> 12])
- #define VTTOIF(indx) (vttoif_tab[(int)(indx)])
- #define MAKEIMODE(indx, mode) (int)(VTTOIF(indx) | (mode))
-
- /*
- * Flags to various vnode functions.
- */
- #define SKIPSYSTEM 0x0001 /* vflush: skip vnodes marked VSYSTEM */
- #define FORCECLOSE 0x0002 /* vflush: force file closeure */
- #define WRITECLOSE 0x0004 /* vflush: only close writeable files */
- #define DOCLOSE 0x0008 /* vclean: close active files */
- #define V_SAVE 0x0001 /* vinvalbuf: sync file first */
- #define V_SAVEMETA 0x0002 /* vinvalbuf: leave indirect blocks */
-
- #ifdef DIAGNOSTIC
- #define HOLDRELE(vp) holdrele(vp)
- #define VATTR_NULL(vap) vattr_null(vap)
- #define VHOLD(vp) vhold(vp)
- #define VREF(vp) vref(vp)
-
- void holdrele __P((struct vnode *));
- void vattr_null __P((struct vattr *));
- void vhold __P((struct vnode *));
- void vref __P((struct vnode *));
- #else
- #define HOLDRELE(vp) (vp)->v_holdcnt-- /* decrease buf or page ref */
- #define VATTR_NULL(vap) (*(vap) = va_null) /* initialize a vattr */
- #define VHOLD(vp) (vp)->v_holdcnt++ /* increase buf or page ref */
- #define VREF(vp) (vp)->v_usecount++ /* increase reference */
- #endif
-
- #define NULLVP ((struct vnode *)NULL)
-
- /*
- * Global vnode data.
- */
- extern struct vnode *rootvnode; /* root (i.e. "/") vnode */
- extern int desiredvnodes; /* number of vnodes desired */
- extern struct vattr va_null; /* predefined null vattr structure */
-
- /*
- * Macro/function to check for client cache inconsistency w.r.t. leasing.
- */
- #define LEASE_READ 0x1 /* Check lease for readers */
- #define LEASE_WRITE 0x2 /* Check lease for modifiers */
-
- #endif /* _KERNEL */
-
-
- /*
- * Mods for exensibility.
- */
-
- /*
- * Flags for vdesc_flags:
- */
- #define VDESC_MAX_VPS 16
- /* Low order 16 flag bits are reserved for willrele flags for vp arguments. */
- #define VDESC_VP0_WILLRELE 0x0001
- #define VDESC_VP1_WILLRELE 0x0002
- #define VDESC_VP2_WILLRELE 0x0004
- #define VDESC_VP3_WILLRELE 0x0008
- #define VDESC_NOMAP_VPP 0x0100
- #define VDESC_VPP_WILLRELE 0x0200
-
- /*
- * VDESC_NO_OFFSET is used to identify the end of the offset list
- * and in places where no such field exists.
- */
- #define VDESC_NO_OFFSET -1
-
- /*
- * This structure describes the vnode operation taking place.
- */
- struct vnodeop_desc {
- int vdesc_offset; /* offset in vector--first for speed */
- char *vdesc_name; /* a readable name for debugging */
- int vdesc_flags; /* VDESC_* flags */
-
- /*
- * These ops are used by bypass routines to map and locate arguments.
- * Creds and procs are not needed in bypass routines, but sometimes
- * they are useful to (for example) transport layers.
- * Nameidata is useful because it has a cred in it.
- */
- int *vdesc_vp_offsets; /* list ended by VDESC_NO_OFFSET */
- int vdesc_vpp_offset; /* return vpp location */
- int vdesc_cred_offset; /* cred location, if any */
- int vdesc_proc_offset; /* proc location, if any */
- int vdesc_componentname_offset; /* if any */
- /*
- * Finally, we've got a list of private data (about each operation)
- * for each transport layer. (Support to manage this list is not
- * yet part of BSD.)
- */
- caddr_t *vdesc_transports;
- };
-
- #ifdef _KERNEL
- /*
- * A list of all the operation descs.
- */
- extern struct vnodeop_desc *vnodeop_descs[];
-
-
- /*
- * This macro is very helpful in defining those offsets in the vdesc struct.
- *
- * This is stolen from X11R4. I ingored all the fancy stuff for
- * Crays, so if you decide to port this to such a serious machine,
- * you might want to consult Intrisics.h's XtOffset{,Of,To}.
- */
- #define VOPARG_OFFSET(p_type,field) \
- ((int) (((char *) (&(((p_type)NULL)->field))) - ((char *) NULL)))
- #define VOPARG_OFFSETOF(s_type,field) \
- VOPARG_OFFSET(s_type*,field)
- #define VOPARG_OFFSETTO(S_TYPE,S_OFFSET,STRUCT_P) \
- ((S_TYPE)(((char*)(STRUCT_P))+(S_OFFSET)))
-
-
- /*
- * This structure is used to configure the new vnodeops vector.
- */
- struct vnodeopv_entry_desc {
- struct vnodeop_desc *opve_op; /* which operation this is */
- int (*opve_impl) __P((void *)); /* code implementing this operation */
- };
- struct vnodeopv_desc {
- /* ptr to the ptr to the vector where op should go */
- int (***opv_desc_vector_p) __P((void *));
- struct vnodeopv_entry_desc *opv_desc_ops; /* null terminated list */
- };
-
- /*
- * A default routine which just returns an error.
- */
- int vn_default_error __P((void *));
-
- /*
- * A generic structure.
- * This can be used by bypass routines to identify generic arguments.
- */
- struct vop_generic_args {
- struct vnodeop_desc *a_desc;
- /* other random data follows, presumably */
- };
-
- /*
- * VOCALL calls an op given an ops vector. We break it out because BSD's
- * vclean changes the ops vector and then wants to call ops with the old
- * vector.
- */
- #define VOCALL(OPSV,OFF,AP) (( *((OPSV)[(OFF)])) (AP))
-
- /*
- * This call works for vnodes in the kernel.
- */
- #define VCALL(VP,OFF,AP) VOCALL((VP)->v_op,(OFF),(AP))
- #define VDESC(OP) (& __CONCAT(OP,_desc))
- #define VOFFSET(OP) (VDESC(OP)->vdesc_offset)
-
- /*
- * Finally, include the default set of vnode operations.
- */
- #include <sys/vnode_if.h>
-
- /*
- * Public vnode manipulation functions.
- */
- struct file;
- struct filedesc;
- struct mount;
- struct nameidata;
- struct proc;
- struct stat;
- struct ucred;
- struct uio;
- struct vattr;
- struct vnode;
-
- int bdevvp __P((dev_t dev, struct vnode **vpp));
- int cdevvp __P((dev_t dev, struct vnode **vpp));
- int getnewvnode __P((enum vtagtype tag, struct mount *mp,
- int (**vops) __P((void *)), struct vnode **vpp));
- int getvnode __P((struct filedesc *fdp, int fd, struct file **fpp));
- void getnewfsid __P((struct mount *, int));
- void vattr_null __P((struct vattr *vap));
- int vcount __P((struct vnode *vp));
- void vclean __P((struct vnode *, int));
- int vfinddev __P((dev_t, enum vtype, struct vnode **));
- void vflushbuf __P((struct vnode *vp, int sync));
- int vflush __P((struct mount *mp, struct vnode *vp, int flags));
- void vntblinit __P((void));
- void vwakeup __P((struct buf *));
- int vget __P((struct vnode *vp, int lockflag));
- void vgone __P((struct vnode *vp));
- void vgoneall __P((struct vnode *vp));
- int vinvalbuf __P((struct vnode *vp, int save, struct ucred *cred,
- struct proc *p, int slpflag, int slptimeo));
- void vprint __P((char *label, struct vnode *vp));
- int vn_bwrite __P((void *ap));
- int vn_close __P((struct vnode *vp,
- int flags, struct ucred *cred, struct proc *p));
- int vn_closefile __P((struct file *fp, struct proc *p));
- int vn_ioctl __P((struct file *fp, u_long com, caddr_t data,
- struct proc *p));
- int vn_open __P((struct nameidata *ndp, int fmode, int cmode));
- int vn_rdwr __P((enum uio_rw rw, struct vnode *vp, caddr_t base,
- int len, off_t offset, enum uio_seg segflg, int ioflg,
- struct ucred *cred, int *aresid, struct proc *p));
- int vn_read __P((struct file *fp, struct uio *uio, struct ucred *cred));
- int vn_select __P((struct file *fp, int which, struct proc *p));
- int vn_stat __P((struct vnode *vp, struct stat *sb, struct proc *p));
- int vn_write __P((struct file *fp, struct uio *uio, struct ucred *cred));
- int vn_writechk __P((struct vnode *vp));
- struct vnode *
- checkalias __P((struct vnode *vp, dev_t nvp_rdev, struct mount *mp));
- void vput __P((struct vnode *vp));
- void vref __P((struct vnode *vp));
- void vrele __P((struct vnode *vp));
- int vaccess __P((mode_t file_mode, uid_t uid, gid_t gid,
- mode_t acc_mode, struct ucred *cred));
- #endif /* _KERNEL */
-