[unix-history] / usr / src / sys / ufs / ufs / ufsmount.h

/*
* Copyright (c) 1982, 1986, 1989, 1993
*      The Regents of the University of California.  All rights reserved.
*
* %sccs.include.redist.c%
*
*      @(#)ufsmount.h  8.2 (Berkeley) %G%
*/

struct buf;
struct inode;
struct nameidata;
struct timeval;
struct ucred;
struct uio;
struct vnode;
struct netexport;

/* This structure describes the UFS specific mount structure data. */
struct ufsmount {
       struct  mount *um_mountp;               /* filesystem vfs structure */
       dev_t   um_dev;                         /* device mounted */
       struct  vnode *um_devvp;                /* block device mounted vnode */
       union {                                 /* pointer to superblock */
               struct  lfs *lfs;               /* LFS */
               struct  fs *fs;                 /* FFS */
       } ufsmount_u;
#define um_fs   ufsmount_u.fs
#define um_lfs  ufsmount_u.lfs
       struct  vnode *um_quotas[MAXQUOTAS];    /* pointer to quota files */
       struct  ucred *um_cred[MAXQUOTAS];      /* quota file access cred */
       u_long  um_nindir;                      /* indirect ptrs per block */
       u_long  um_bptrtodb;                    /* indir ptr to disk block */
       u_long  um_seqinc;                      /* inc between seq blocks */
       time_t  um_btime[MAXQUOTAS];            /* block quota time limit */
       time_t  um_itime[MAXQUOTAS];            /* inode quota time limit */
       char    um_qflags[MAXQUOTAS];           /* quota specific flags */
       struct  netexport um_export;            /* export information */
};
/*
* Flags describing the state of quotas.
*/
#define QTF_OPENING     0x01                    /* Q_QUOTAON in progress */
#define QTF_CLOSING     0x02                    /* Q_QUOTAOFF in progress */

/* Convert mount ptr to ufsmount ptr. */
#define VFSTOUFS(mp)    ((struct ufsmount *)((mp)->mnt_data))

/*
* Macros to access file system parameters in the ufsmount structure.
* Used by ufs_bmap.
*/
#define blkptrtodb(ump, b)      ((b) << (ump)->um_bptrtodb)
#define is_sequential(ump, a, b) ((b) == (a) + ump->um_seqinc)
#define MNINDIR(ump)    ((ump)->um_nindir)