/* $OpenBSD: vnode.h,v 1.156 2020/04/08 08:07:52 mpi Exp $ */ /* $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. 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 */ #ifndef _SYS_VNODE_H_ #define _SYS_VNODE_H_ #include #include #include #include #include /* * 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 }; #define VTYPE_NAMES \ "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. * * Note that v_tag is actually used to tell MFS from FFS, and EXT2FS from * the rest, so don't believe the above comment! */ enum vtagtype { VT_NON, VT_UFS, VT_NFS, VT_MFS, VT_MSDOSFS, VT_PORTAL, VT_PROCFS, VT_AFS, VT_ISOFS, VT_ADOSFS, VT_EXT2FS, VT_VFS, VT_NTFS, VT_UDF, VT_FUSEFS, VT_TMPFS, }; #define VTAG_NAMES \ "NON", "UFS", "NFS", "MFS", "MSDOSFS", \ "unused", "unused", "unused", "ISOFS", "unused", \ "EXT2FS", "VFS", "NTFS", "UDF", "FUSEFS", "TMPFS" /* * 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); RBT_HEAD(buf_rb_bufs, buf); struct namecache; RBT_HEAD(namecache_rb_cache, namecache); struct uvm_vnode; struct vnode { struct uvm_vnode *v_uvm; /* uvm data */ const struct vops *v_op; /* vnode operations vector */ enum vtype v_type; /* vnode type */ enum vtagtype v_tag; /* type of underlying data */ u_int v_flag; /* vnode flags (see below) */ u_int v_usecount; /* reference count of users */ u_int v_uvcount; /* unveil references */ /* reference count of writers */ u_int v_writecount; u_int v_lockcount; /* # threads waiting on lock */ /* Flags that can be read/written in interrupts */ u_int v_bioflag; u_int v_holdcnt; /* buffer references */ u_int v_id; /* capability identifier */ u_int v_inflight; struct mount *v_mount; /* ptr to vfs we are in */ TAILQ_ENTRY(vnode) v_freelist; /* vnode freelist */ TAILQ_ENTRY(vnode) v_mntvnodes; /* vnodes for mount point */ struct buf_rb_bufs v_bufs_tree; /* lookup of all bufs */ struct buflists v_cleanblkhd; /* clean blocklist head */ struct buflists v_dirtyblkhd; /* dirty blocklist head */ u_int v_numoutput; /* num of writes in progress */ LIST_ENTRY(vnode) v_synclist; /* vnode with dirty buffers */ union { struct mount *vu_mountedhere;/* ptr to mounted vfs (VDIR) */ struct socket *vu_socket; /* unix ipc (VSOCK) */ struct specinfo *vu_specinfo; /* device (VCHR, VBLK) */ struct fifoinfo *vu_fifoinfo; /* fifo (VFIFO) */ } v_un; /* VFS namecache */ struct namecache_rb_cache v_nc_tree; TAILQ_HEAD(, namecache) v_cache_dst; /* cache entries to us */ void *v_data; /* private data for fs */ struct selinfo v_selectinfo; /* identity of poller(s) */ }; #define v_mountedhere v_un.vu_mountedhere #define v_socket v_un.vu_socket #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 VCLONED 0x0400 /* vnode was cloned */ #define VALIASED 0x0800 /* vnode has an alias */ #define VLARVAL 0x1000 /* vnode data not yet set up by higher level */ #define VLOCKSWORK 0x4000 /* FS supports locking discipline */ #define VCLONE 0x8000 /* vnode is a clone */ /* * (v_bioflag) Flags that may be manipulated by interrupt handlers */ #define VBIOWAIT 0x0001 /* waiting for output to complete */ #define VBIOONSYNCLIST 0x0002 /* Vnode is on syncer worklist */ #define VBIOONFREELIST 0x0004 /* Vnode is on a free list */ #define VBIOERROR 0x0008 /* A write failed */ /* * Vnode attributes. A field value of VNOVAL represents a field whose value * is unavailable (getattr) or which is not to be changed (setattr). For * the timespec fields, only the tv_nsec member needs to be set to VNOVAL: * if tv_nsec != VNOVAL then both tv_sec and tv_nsec are valid. */ struct vattr { enum vtype va_type; /* vnode type (for create) */ mode_t va_mode; /* files access mode and type */ nlink_t 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) */ u_quad_t 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_vaflags. */ #define VA_UTIMES_NULL 0x01 /* utimes argument was NULL */ #define VA_EXCLUSIVE 0x02 /* exclusive create request */ #define VA_UTIMES_CHANGE 0x04 /* ctime should be updated */ /* * 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 */ #define IO_NOLIMIT 0x20 /* don't enforce limits on i/o */ #define IO_NOCACHE 0x40 /* don't cache result of this i/o */ /* * 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 RBT_PROTOTYPE(buf_rb_bufs, buf, b_rbbufs, rb_buf_compare); /* * 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 IGNORECLEAN 0x0010 /* vflush: ignore clean vnodes */ #define V_SAVE 0x0001 /* vinvalbuf: sync file first */ #define V_SAVEMETA 0x0002 /* vinvalbuf: leave indirect blocks */ #define REVOKEALL 0x0001 /* vop_revoke: revoke all aliases */ TAILQ_HEAD(freelst, vnode); extern struct freelst vnode_hold_list; /* free vnodes referencing buffers */ extern struct freelst vnode_free_list; /* vnode free list */ #define VATTR_NULL(vap) vattr_null(vap) #define NULLVP ((struct vnode *)NULL) #define VN_KNOTE(vp, b) \ KNOTE(&vp->v_selectinfo.si_note, (b)) /* * Global vnode data. */ extern struct vnode *rootvnode; /* root (i.e. "/") vnode */ extern int initialvnodes; /* XXX number of vnodes to start */ extern int maxvnodes; /* XXX number of vnodes to allocate */ extern int syncdelay; /* seconds to delay syncing vnodes */ extern int rushjob; /* # of slots syncer should run ASAP */ extern void vhold(struct vnode *); extern void vdrop(struct vnode *); /* vnode operations */ struct vops { int (*vop_lock)(void *); int (*vop_unlock)(void *); int (*vop_islocked)(void *); int (*vop_abortop)(void *); int (*vop_access)(void *); int (*vop_advlock)(void *); int (*vop_bmap)(void *); int (*vop_bwrite)(void *); int (*vop_close)(void *); int (*vop_create)(void *); int (*vop_fsync)(void *); int (*vop_getattr)(void *); int (*vop_inactive)(void *); int (*vop_ioctl)(void *); int (*vop_link)(void *); int (*vop_lookup)(void *); int (*vop_mknod)(void *); int (*vop_open)(void *); int (*vop_pathconf)(void *); int (*vop_poll)(void *); int (*vop_print)(void *); int (*vop_read)(void *); int (*vop_readdir)(void *); int (*vop_readlink)(void *); int (*vop_reclaim)(void *); int (*vop_remove)(void *); int (*vop_rename)(void *); int (*vop_revoke)(void *); int (*vop_mkdir)(void *); int (*vop_rmdir)(void *); int (*vop_setattr)(void *); int (*vop_strategy)(void *); int (*vop_symlink)(void *); int (*vop_write)(void *); int (*vop_kqfilter)(void *); }; extern const struct vops dead_vops; extern const struct vops spec_vops; struct vop_generic_args { void *a_garbage; /* Other data probably follows; */ }; struct vop_islocked_args { struct vnode *a_vp; }; int VOP_ISLOCKED(struct vnode *); struct vop_lookup_args { struct vnode *a_dvp; struct vnode **a_vpp; struct componentname *a_cnp; }; int VOP_LOOKUP(struct vnode *, struct vnode **, struct componentname *); struct vop_create_args { struct vnode *a_dvp; struct vnode **a_vpp; struct componentname *a_cnp; struct vattr *a_vap; }; int VOP_CREATE(struct vnode *, struct vnode **, struct componentname *, struct vattr *); struct vop_mknod_args { struct vnode *a_dvp; struct vnode **a_vpp; struct componentname *a_cnp; struct vattr *a_vap; }; int VOP_MKNOD(struct vnode *, struct vnode **, struct componentname *, struct vattr *); struct vop_open_args { struct vnode *a_vp; int a_mode; struct ucred *a_cred; struct proc *a_p; }; int VOP_OPEN(struct vnode *, int, struct ucred *, struct proc *); struct vop_close_args { struct vnode *a_vp; int a_fflag; struct ucred *a_cred; struct proc *a_p; }; int VOP_CLOSE(struct vnode *, int, struct ucred *, struct proc *); struct vop_access_args { struct vnode *a_vp; int a_mode; struct ucred *a_cred; struct proc *a_p; }; int VOP_ACCESS(struct vnode *, int, struct ucred *, struct proc *); struct vop_getattr_args { struct vnode *a_vp; struct vattr *a_vap; struct ucred *a_cred; struct proc *a_p; }; int VOP_GETATTR(struct vnode *, struct vattr *, struct ucred *, struct proc *); struct vop_setattr_args { struct vnode *a_vp; struct vattr *a_vap; struct ucred *a_cred; struct proc *a_p; }; int VOP_SETATTR(struct vnode *, struct vattr *, struct ucred *, struct proc *); struct vop_read_args { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; struct ucred *a_cred; }; int VOP_READ(struct vnode *, struct uio *, int, struct ucred *); struct vop_write_args { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; struct ucred *a_cred; }; int VOP_WRITE(struct vnode *, struct uio *, int, struct ucred *); struct vop_ioctl_args { struct vnode *a_vp; u_long a_command; void *a_data; int a_fflag; struct ucred *a_cred; struct proc *a_p; }; int VOP_IOCTL(struct vnode *, u_long, void *, int, struct ucred *, struct proc *); struct vop_poll_args { struct vnode *a_vp; int a_fflag; int a_events; struct proc *a_p; }; int VOP_POLL(struct vnode *, int, int, struct proc *); struct vop_kqfilter_args { struct vnode *a_vp; int a_fflag; struct knote *a_kn; }; int VOP_KQFILTER(struct vnode *, int, struct knote *); struct vop_revoke_args { struct vnode *a_vp; int a_flags; }; int VOP_REVOKE(struct vnode *, int); struct vop_fsync_args { struct vnode *a_vp; struct ucred *a_cred; int a_waitfor; struct proc *a_p; }; int VOP_FSYNC(struct vnode *, struct ucred *, int, struct proc *); struct vop_remove_args { struct vnode *a_dvp; struct vnode *a_vp; struct componentname *a_cnp; }; int VOP_REMOVE(struct vnode *, struct vnode *, struct componentname *); struct vop_link_args { struct vnode *a_dvp; struct vnode *a_vp; struct componentname *a_cnp; }; int VOP_LINK(struct vnode *, struct vnode *, struct componentname *); struct vop_rename_args { struct vnode *a_fdvp; struct vnode *a_fvp; struct componentname *a_fcnp; struct vnode *a_tdvp; struct vnode *a_tvp; struct componentname *a_tcnp; }; int VOP_RENAME(struct vnode *, struct vnode *, struct componentname *, struct vnode *, struct vnode *, struct componentname *); struct vop_mkdir_args { struct vnode *a_dvp; struct vnode **a_vpp; struct componentname *a_cnp; struct vattr *a_vap; }; int VOP_MKDIR(struct vnode *, struct vnode **, struct componentname *, struct vattr *); struct vop_rmdir_args { struct vnode *a_dvp; struct vnode *a_vp; struct componentname *a_cnp; }; int VOP_RMDIR(struct vnode *, struct vnode *, struct componentname *); struct vop_symlink_args { struct vnode *a_dvp; struct vnode **a_vpp; struct componentname *a_cnp; struct vattr *a_vap; char *a_target; }; int VOP_SYMLINK(struct vnode *, struct vnode **, struct componentname *, struct vattr *, char *); struct vop_readdir_args { struct vnode *a_vp; struct uio *a_uio; struct ucred *a_cred; int *a_eofflag; }; int VOP_READDIR(struct vnode *, struct uio *, struct ucred *, int *); struct vop_readlink_args { struct vnode *a_vp; struct uio *a_uio; struct ucred *a_cred; }; int VOP_READLINK(struct vnode *, struct uio *, struct ucred *); struct vop_abortop_args { struct vnode *a_dvp; struct componentname *a_cnp; }; int VOP_ABORTOP(struct vnode *, struct componentname *); struct vop_inactive_args { struct vnode *a_vp; struct proc *a_p; }; int VOP_INACTIVE(struct vnode *, struct proc *); struct vop_reclaim_args { struct vnode *a_vp; struct proc *a_p; }; int VOP_RECLAIM(struct vnode *, struct proc *); struct vop_lock_args { struct vnode *a_vp; int a_flags; }; int VOP_LOCK(struct vnode *, int); struct vop_unlock_args { struct vnode *a_vp; }; int VOP_UNLOCK(struct vnode *); struct vop_bmap_args { struct vnode *a_vp; daddr_t a_bn; struct vnode **a_vpp; daddr_t *a_bnp; int *a_runp; }; int VOP_BMAP(struct vnode *, daddr_t, struct vnode **, daddr_t *, int *); struct vop_print_args { struct vnode *a_vp; }; int VOP_PRINT(struct vnode *); struct vop_pathconf_args { struct vnode *a_vp; int a_name; register_t *a_retval; }; int VOP_PATHCONF(struct vnode *, int, register_t *); struct vop_advlock_args { struct vnode *a_vp; void *a_id; int a_op; struct flock *a_fl; int a_flags; }; int VOP_ADVLOCK(struct vnode *, void *, int, struct flock *, int); /* Special cases: */ struct vop_strategy_args { struct buf *a_bp; }; int VOP_STRATEGY(struct buf *); struct vop_bwrite_args { struct buf *a_bp; }; int VOP_BWRITE(struct buf *); /* End of special cases. */ /* Public vnode manipulation functions. */ struct file; struct filedesc; struct mount; struct nameidata; struct proc; struct stat; struct statfs; struct ucred; struct uio; struct vattr; struct vnode; /* vfs_subr */ int bdevvp(dev_t, struct vnode **); int cdevvp(dev_t, struct vnode **); struct vnode *checkalias(struct vnode *, dev_t, struct mount *); int getnewvnode(enum vtagtype, struct mount *, const struct vops *, struct vnode **); int vaccess(enum vtype, mode_t, uid_t, gid_t, mode_t, struct ucred *); int vnoperm(struct vnode *); void vattr_null(struct vattr *); void vdevgone(int, int, int, enum vtype); int vcount(struct vnode *); int vfinddev(dev_t, enum vtype, struct vnode **); void vflushbuf(struct vnode *, int); int vflush(struct mount *, struct vnode *, int); int vget(struct vnode *, int); void vgone(struct vnode *); void vgonel(struct vnode *, struct proc *); int vinvalbuf(struct vnode *, int, struct ucred *, struct proc *, int, uint64_t); void vntblinit(void); int vwaitforio(struct vnode *, int, char *, uint64_t); void vwakeup(struct vnode *); void vput(struct vnode *); int vrecycle(struct vnode *, struct proc *); int vrele(struct vnode *); void vref(struct vnode *); void vprint(char *, struct vnode *); void copy_statfs_info(struct statfs *, const struct mount *); /* vfs_getcwd.c */ #define GETCWD_CHECK_ACCESS 0x0001 int vfs_getcwd_scandir(struct vnode **, struct vnode **, char **, char *, struct proc *); int vfs_getcwd_common(struct vnode *, struct vnode *, char **, char *, int, int, struct proc *); int vfs_getcwd_getcache(struct vnode **, struct vnode **, char **, char *); /* vfs_default.c */ int vop_generic_abortop(void *); int vop_generic_bmap(void *); int vop_generic_bwrite(void *); int vop_generic_islocked(void *); int vop_generic_lock(void *); int vop_generic_unlock(void *); int vop_generic_revoke(void *); int vop_generic_kqfilter(void *); int vop_generic_lookup(void *); /* vfs_vnops.c */ int vn_isunder(struct vnode *, struct vnode *, struct proc *); int vn_close(struct vnode *, int, struct ucred *, struct proc *); int vn_open(struct nameidata *, int, int); int vn_rdwr(enum uio_rw, struct vnode *, caddr_t, int, off_t, enum uio_seg, int, struct ucred *, size_t *, struct proc *); int vn_stat(struct vnode *, struct stat *, struct proc *); int vn_statfile(struct file *, struct stat *, struct proc *); int vn_lock(struct vnode *, int); int vn_writechk(struct vnode *); int vn_fsizechk(struct vnode *, struct uio *, int, ssize_t *); int vn_ioctl(struct file *, u_long, caddr_t, struct proc *); void vn_marktext(struct vnode *); /* vfs_sync.c */ void syncer_thread(void *); void vn_initialize_syncerd(void); void vn_syncer_add_to_worklist(struct vnode *, int); /* misc */ int vn_isdisk(struct vnode *, int *); int softdep_fsync(struct vnode *); int getvnode(struct proc *, int, struct file **); /* uvm */ void uvm_vnp_setsize(struct vnode *, off_t); void uvm_vnp_sync(struct mount *); void uvm_vnp_terminate(struct vnode *); int uvm_vnp_uncache(struct vnode *); #endif /* _KERNEL */ #endif /* _SYS_VNODE_H_ */