NetBSD/sys/msdosfs/msdosfsmount.h

133 lines
4.8 KiB
C

/*
* Written by Paul Popelka (paulp@uts.amdahl.com)
*
* You can do anything you want with this software, just don't say you wrote
* it, and don't remove this notice.
*
* This software is provided "as is".
*
* The author supplies this software to be publicly redistributed on the
* understanding that the author is not responsible for the correct
* functioning of this software in any circumstances and is not liable for
* any damages caused by this software.
*
* October 1992
*
* $Id: msdosfsmount.h,v 1.1 1993/08/13 11:35:41 cgd Exp $
*/
/*
* Layout of the mount control block for a msdos file system.
*/
struct msdosfsmount {
struct mount *pm_mountp;/* vfs mount struct for this fs */
dev_t pm_dev; /* block special device mounted */
struct vnode *pm_devvp; /* vnode for block device mntd */
struct bpb50 pm_bpb; /* BIOS parameter blk for this fs */
u_long pm_fatblk; /* block # of first FAT */
u_long pm_rootdirblk; /* block # of root directory */
u_long pm_rootdirsize; /* size in blocks (not clusters) */
u_long pm_firstcluster; /* block number of first cluster */
u_long pm_nmbrofclusters; /* # of clusters in filesystem */
u_long pm_maxcluster; /* maximum cluster number */
u_long pm_freeclustercount; /* number of free clusters */
u_long pm_lookhere; /* start free cluster search here */
u_long pm_bnshift; /* shift file offset right this amount to get a block number */
u_long pm_brbomask; /* and a file offset with this mask to get block rel offset */
u_long pm_cnshift; /* shift file offset right this amount to get a cluster number */
u_long pm_crbomask; /* and a file offset with this mask to get cluster rel offset */
u_long pm_bpcluster; /* bytes per cluster */
u_long pm_depclust; /* directory entries per cluster */
u_long pm_fmod; /* ~0 if fs is modified, this can rollover to 0 */
u_long pm_fatblocksize; /* size of fat blocks in bytes */
u_long pm_fatblocksec; /* size of fat blocks in sectors */
u_long pm_fatsize; /* size of fat in bytes */
u_char *pm_inusemap; /* ptr to bitmap of in-use clusters */
char pm_ronly; /* read only if non-zero */
char pm_waitonfat; /* wait for writes of the fat to complt, when 0 use bdwrite, else use bwrite */
};
/*
* How to compute pm_cnshift and pm_crbomask.
*
* pm_crbomask = (pm_SectPerClust * pm_BytesPerSect) - 1
* if (bytesperclust == * 0)
* return EBADBLKSZ;
* bit = 1;
* for (i = 0; i < 32; i++) {
* if (bit & bytesperclust) {
* if (bit ^ bytesperclust)
* return EBADBLKSZ;
* pm_cnshift = * i;
* break;
* }
* bit <<= 1;
* }
*/
/*
* Shorthand for fields in the bpb contained in the msdosfsmount structure.
*/
#define pm_BytesPerSec pm_bpb.bpbBytesPerSec
#define pm_SectPerClust pm_bpb.bpbSecPerClust
#define pm_ResSectors pm_bpb.bpbResSectors
#define pm_FATs pm_bpb.bpbFATs
#define pm_RootDirEnts pm_bpb.bpbRootDirEnts
#define pm_Sectors pm_bpb.bpbSectors
#define pm_Media pm_bpb.bpbMedia
#define pm_FATsecs pm_bpb.bpbFATsecs
#define pm_SecPerTrack pm_bpb.bpbSecPerTrack
#define pm_Heads pm_bpb.bpbHeads
#define pm_HiddenSects pm_bpb.bpbHiddenSecs
#define pm_HugeSectors pm_bpb.bpbHugeSectors
/*
* Map a cluster number into a filesystem relative block number.
*/
#define cntobn(pmp, cn) \
((((cn)-CLUST_FIRST) * (pmp)->pm_SectPerClust) + (pmp)->pm_firstcluster)
/*
* Map a filesystem relative block number back into a cluster number.
*/
#define bntocn(pmp, bn) \
((((bn) - pmp->pm_firstcluster)/ (pmp)->pm_SectPerClust) + CLUST_FIRST)
/*
* Calculate block number for directory entry in root dir, offset dirofs
*/
#define roottobn(pmp, dirofs) \
(((dirofs) / (pmp)->pm_depclust) * (pmp)->pm_SectPerClust \
+ (pmp)->pm_rootdirblk)
/*
* Calculate block number for directory entry at cluster dirclu, offset
* dirofs
*/
#define detobn(pmp, dirclu, dirofs) \
((dirclu) == MSDOSFSROOT \
? roottobn((pmp), (dirofs)) \
: cntobn((pmp), (dirclu)))
/*
* Convert pointer to buffer -> pointer to direntry
*/
#define bptoep(pmp, bp, dirofs) \
((struct direntry *)((bp)->b_un.b_addr) \
+ (dirofs) % (pmp)->pm_depclust)
/*
* Prototypes for MSDOSFS virtual filesystem operations
*/
int msdosfs_mount __P((struct mount * mp, char *path, caddr_t data, struct nameidata * ndp, struct proc * p));
int msdosfs_start __P((struct mount * mp, int flags, struct proc * p));
int msdosfs_unmount __P((struct mount * mp, int mntflags, struct proc * p));
int msdosfs_root __P((struct mount * mp, struct vnode ** vpp));
int msdosfs_quotactl __P((struct mount * mp, int cmds, int uid /* should be uid_t */, caddr_t arg, struct proc * p));
int msdosfs_statfs __P((struct mount * mp, struct statfs * sbp, struct proc * p));
int msdosfs_sync __P((struct mount * mp, int waitfor));
int msdosfs_fhtovp __P((struct mount * mp, struct fid * fhp, struct vnode ** vpp));
int msdosfs_vptofh __P((struct vnode * vp, struct fid * fhp));
int msdosfs_init __P(());