calmsacibis995
178 lines
5.7 KiB
C
178 lines
5.7 KiB
C
/* Copyright (c) 1990, 1991 UNIX System Laboratories, Inc. */
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/* Copyright (c) 1984, 1986, 1987, 1988, 1989, 1990 AT&T */
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/* All Rights Reserved */
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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF */
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/* UNIX System Laboratories, Inc. */
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/* The copyright notice above does not evidence any */
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/* actual or intended publication of such source code. */
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#ifndef _FS_SPECFS_CSNODE_H /* wrapper symbol for kernel use */
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#define _FS_SPECFS_CSNODE_H /* subject to change without notice */
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#ident "$Revision: 1.17 $"
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#include <sys/types.h>
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#include <sys/sema.h>
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#include <fs/specfs/spec_ops.h>
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/*
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* The csnode represents a special file in any filesystem.
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* There is exactly one csnode for each active special file.
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* Filesystems, and others use an "local" lsnode to lead to
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* the "common" snode via the ls2cs_handle field.
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*/
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typedef struct csnode {
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struct csnode *cs_next; /* hash link - must be first */
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uint64_t cs_flag; /* flags, must be 2nd, see below*/
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bhv_desc_t cs_bhv_desc; /* specfs behavior descriptor */
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mutex_t cs_lock; /* mutual exclusion lock */
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short cs_locktrips; /* # of lock reacquisitions */
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sv_t cs_close_sync; /* synchronizing variable */
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uint64_t cs_close_flag; /* close sync flags */
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int cs_opencnt; /* count of opened references */
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dev_t cs_dev; /* device the csnode represents */
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dev_t cs_fsid; /* file system identifier */
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daddr_t cs_nextr; /* next byte offset (read-ahead)*/
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daddr_t cs_size; /* blk device size (basic blks) */
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time_t cs_atime; /* time of last access */
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time_t cs_mtime; /* time of last modification */
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time_t cs_ctime; /* time of last attributes chg */
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u_int16_t cs_mode; /* get/setattr mode bits */
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__uint32_t cs_uid; /* owner's user id */
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__uint32_t cs_gid; /* owner's group id */
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u_int16_t cs_projid; /* owner's project id */
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long cs_mapcnt; /* count of mappings of pages */
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long cs_gen; /* commonvp gen number */
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union {
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struct bdevsw *cs_blk; /* VBLK - devsw address */
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struct cdevsw *cs_chr; /* VBLK - devsw address */
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} cs_devsw;
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int (*cs_poll)(void *, short, int, short *,
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void **, unsigned int *);
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void *cs_polla0; /* first arg to cs_poll */
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} csnode_t;
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#define cs_bdevsw cs_devsw.cs_blk
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#define cs_cdevsw cs_devsw.cs_chr
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/*
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* flags
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*/
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#define SUPD 0x0001 /* update access time */
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#define SACC 0x0002 /* update modification time */
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#define SCHG 0x0004 /* update change time */
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#define SMOUNTED 0x0008 /* block device is mounted */
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#define SWANTCLOSE 0x0010 /* device successfully opened */
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#define SCOMMON 0x0020 /* this snode is the "common" */
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#define SPASS 0x0040 /* "pass-thru" mode */
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#define SLINKREMOVED 0x0080 /* vop_link_removed() flag */
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#define SINACTIVE 0x0100 /* snode/vnode is "inactive" */
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#define SCLOSING 0x0200 /* snode/vnode is "mid-close" */
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#define SWAITING 0x0400 /* Waiting on SCLOSING */
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#define SATTR 0x0800 /* "attr" layer exists below */
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#define SSTREAM 0x1000 /* VCHR that's a "stream" */
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/*
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* Flags for changing time.
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*/
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#define SPECFS_ICHGTIME_MOD 0x1 /* modification timestamp */
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#define SPECFS_ICHGTIME_ACC 0x2 /* access timestamp */
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#define SPECFS_ICHGTIME_CHG 0x4 /* inode field change timestamp */
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/*
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* File types (mode field)
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*/
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#define IFMT 0170000 /* type of file */
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#define IFIFO 0010000 /* named pipe (fifo) */
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#define IFCHR 0020000 /* character special */
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#define IFDIR 0040000 /* directory */
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#define IFBLK 0060000 /* block special */
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#define IFREG 0100000 /* regular */
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#define IFLNK 0120000 /* symbolic link */
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#define IFSOCK 0140000 /* socket */
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#define IFMNT 0160000 /* mount point */
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/*
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* File execution and access modes.
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*/
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#define ISUID 04000 /* set user id on execution */
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#define ISGID 02000 /* set group id on execution */
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#define ISVTX 01000 /* sticky directory */
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#define IREAD 0400 /* read, write, execute permissions */
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#define IWRITE 0200
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#define IEXEC 0100
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/*
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* Convert between behavior and csnode
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*/
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#define VP_TO_CSP(Vp) ((csnode_t *)(BHV_PDATA(VNODE_TO_FIRST_BHV(Vp))))
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#define BHV_TO_CSP(Bdp) ((csnode_t *)(BHV_PDATA(Bdp)))
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#define CSP_TO_BHV(Csp) (&((Csp)->cs_bhv_desc))
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#define CSP_TO_VP(Csp) BHV_TO_VNODE(CSP_TO_BHV(Csp))
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/*
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* Convert between a "handle" and a csnode address
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*/
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#ifdef CELL_IRIX
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# define HANDLE_TO_CSP(hndl) ((csnode_t *)(hndl)->sh_obj.h_objid)
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#else /* ! CELL_IRIX */
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# define HANDLE_TO_CSP(hndl) ((csnode_t *)(hndl)->objid)
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#endif /* ! CELL_IRIX */
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#ifdef _KERNEL
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/*
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* If driver does not have a size routine (e.g. old drivers), the size of the
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* device is assumed to be infinite.
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*/
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#define UNKNOWN_SIZE 0x7fffffff
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/*
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* Lock and unlock snodes.
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*/
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#define SPEC_CSP_LOCK(Csp) spec_cs_lock(Csp)
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#define SPEC_CSP_UNLOCK(Csp) spec_cs_unlock(Csp)
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void spec_cs_lock(struct csnode *);
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void spec_cs_unlock(struct csnode *);
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/*
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* CSnode lookup stuff.
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* These routines maintain a table of csnodes hashed by dev so
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* that the csnode for a dev can be found if it already exists.
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* NOTE: DCSPECTBSIZE must be a power of 2 for DCSPECTBHASH to work!
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*/
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#define DCSPECTBSIZE 128 /* XXX too small? */
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#define DCSPECTBHASH(dev) ((getemajor(dev) + getminor(dev)) & (DCSPECTBSIZE-1))
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extern struct vnodeops spec_cs_vnodeops;
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#ifdef JTK_DEBUG
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/*
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* Convert a device vnode pointer into a common device vnode pointer.
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*/
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extern int spec_vp_is_common(struct vnode *);
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#endif /* JTK_DEBUG */
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/*
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* Common cs spec functions
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*/
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extern csnode_t *spec_cs_get(dev_t dev, vtype_t type);
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extern void spec_cs_free(struct csnode *);
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extern void spec_cs_delete(struct csnode *);
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extern void spec_cs_mark(struct csnode *, int);
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extern int spec_cs_device_close(csnode_t *, int, struct cred *);
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extern int spec_cs_device_hold(csnode_t *);
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extern void spec_cs_device_rele(csnode_t *);
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#endif /* _KERNEL */
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#endif /* _FS_SPECFS_CSNODE_H */
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