* 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.
* from NetBSD: denode.h,v 1.2 1993/09/07 15:41:31 ws Exp
* This is the pc filesystem specific portion of the vnode structure. To
* describe a file uniquely the de_dirclust, de_diroffset, and
* de_de.deStartCluster fields are used. de_dirclust contains the cluster
* number of the directory cluster containing the entry for a file or
* directory. de_diroffset is the index into the cluster for the entry
* describing a file or directory. de_de.deStartCluster is the number of
* the first cluster of the file or directory. Now to describe the quirks
* of the pc filesystem. - Clusters 0 and 1 are reserved. - The first
* allocatable cluster is 2. - The root directory is of fixed size and all
* blocks that make it up are contiguous. - Cluster 0 refers to the root
* directory when it is found in the startcluster field of a directory
* entry that points to another directory. - Cluster 0 implies a 0 length
* file when found in the start cluster field of a directory entry that
* points to a file. - You can't use the cluster number 0 to derive the
* address of the root directory. - Multiple directory entries can point to
* a directory. The entry in the parent directory points to a child
* directory. Any directories in the child directory contain a ".." entry
* that points back to the child. The child directory itself contains a
* "." entry that points to itself. - The root directory does not contain a
* "." or ".." entry. - Directory entries for directories are never changed
* once they are created (except when removed). The size stays 0, and the
* last modification time is never changed. This is because so many
* directory entries can point to the physical clusters that make up a
* directory. It would lead to an update nightmare. - The length field in
* a directory entry pointing to a directory contains 0 (always). The only
* way to find the end of a directory is to follow the cluster chain until
* the "last cluster" marker is found. My extensions to make this house of
* cards work. These apply only to the in memory copy of the directory
* entry. - A reference count for each denode will be kept since dos
* doesn't keep such things.
* Internal pseudo-offset for (nonexistent) directory entry for the root
#define MSDOSFSROOT_OFS 0x1fffffff
* The fat cache structure. fc_fsrcn is the filesystem relative cluster
* number that corresponds to the file relative cluster number in this
u_short fc_frcn
; /* file relative cluster number */
u_short fc_fsrcn
; /* filesystem relative cluster number */
* The fat entry cache as it stands helps make extending files a "quick"
* operation by avoiding having to scan the fat to discover the last
* cluster of the file. The cache also helps sequential reads by
* remembering the last cluster read from the file. This also prevents us
* from having to rescan the fat to find the next cluster to read. This
* cache is probably pretty worthless if a file is opened by multiple
#define FC_SIZE 2 /* number of entries in the cache */
#define FC_LASTMAP 0 /* entry the last call to pcbmap() resolved
#define FC_LASTFC 1 /* entry for the last cluster in the file */
#define FCE_EMPTY 0xffff /* doesn't represent an actual cluster # */
* Set a slot in the fat cache.
#define fc_setcache(dep, slot, frcn, fsrcn) \
(dep)->de_fc[slot].fc_frcn = frcn; \
(dep)->de_fc[slot].fc_fsrcn = fsrcn;
* This is the in memory variant of a dos directory entry. It is usually
* contained within a vnode.
struct denode
*de_chain
[2]; /* hash chain ptrs */
struct vnode
*de_vnode
; /* addr of vnode we are part of */
struct vnode
*de_devvp
; /* vnode of blk dev we live on */
u_long de_flag
; /* flag bits */
dev_t de_dev
; /* device where direntry lives */
u_long de_dirclust
; /* cluster of the directory file containing this entry */
u_long de_diroffset
; /* ordinal of this entry in the directory */
long de_refcnt
; /* reference count */
struct msdosfsmount
*de_pmp
; /* addr of our mount struct */
struct lockf
*de_lockf
; /* byte level lock list */
long de_spare0
; /* current lock holder */
long de_spare1
; /* lock wanter */
struct direntry de_de
; /* the actual directory entry */
struct fatcache de_fc
[FC_SIZE
]; /* fat cache */
* Values for the de_flag field of the denode.
#define DELOCKED 0x0001 /* directory entry is locked */
#define DEWANT 0x0002 /* someone wants this de */
#define DERENAME 0x0004 /* de is being renamed */
#define DEUPD 0x0008 /* file has been modified */
#define DESHLOCK 0x0010 /* file has shared lock */
#define DEEXLOCK 0x0020 /* file has exclusive lock */
#define DELWAIT 0x0040 /* someone waiting on file lock */
#define DEMOD 0x0080 /* denode wants to be written back to disk */
* Shorthand macros used to reference fields in the direntry contained in
#define de_Name de_de.deName
#define de_Extension de_de.deExtension
#define de_Attributes de_de.deAttributes
#define de_Reserved de_de.deReserved
#define de_Time de_de.deTime
#define de_Date de_de.deDate
#define de_StartCluster de_de.deStartCluster
#define de_FileSize de_de.deFileSize
#define de_forw de_chain[0]
#define de_back de_chain[1]
#define VTODE(vp) ((struct denode *)(vp)->v_data)
#define DETOV(de) ((de)->de_vnode)
#define DELOCK(de) delock(de)
#define DEUNLOCK(de) deunlock(de)
#define DEUPDAT(dep, t, waitfor) \
if (dep->de_flag & DEUPD) \
(void) deupdat(dep, t, waitfor);
#define DETIMES(dep, t) \
if (dep->de_flag & DEUPD) { \
(dep)->de_flag |= DEMOD; \
unix2dostime(t, (union dosdate *)&dep->de_Date, \
(union dostime *)&dep->de_Time); \
(dep)->de_flag &= ~DEUPD; \
* This overlays the fid sturcture (see mount.h)
u_short defid_len
; /* length of structure */
u_short defid_pad
; /* force long alignment */
u_long defid_dirclust
; /* cluster this dir entry came from */
u_long defid_dirofs
; /* index of entry within the cluster */
/* u_long defid_gen; /* generation number */
* Prototypes for MSDOSFS vnode operations
int msdosfs_lookup
__P((struct vnode
* vp
, struct nameidata
* ndp
, struct proc
* p
));
int msdosfs_create
__P((struct nameidata
* ndp
, struct vattr
* vap
, struct proc
* p
));
int msdosfs_mknod
__P((struct nameidata
* ndp
, struct vattr
* vap
, struct ucred
* cred
, struct proc
* p
));
int msdosfs_open
__P((struct vnode
* vp
, int mode
, struct ucred
* cred
, struct proc
* p
));
int msdosfs_close
__P((struct vnode
* vp
, int fflag
, struct ucred
* cred
, struct proc
* p
));
int msdosfs_access
__P((struct vnode
* vp
, int mode
, struct ucred
* cred
, struct proc
* p
));
int msdosfs_getattr
__P((struct vnode
* vp
, struct vattr
* vap
, struct ucred
* cred
, struct proc
* p
));
int msdosfs_setattr
__P((struct vnode
* vp
, struct vattr
* vap
, struct ucred
* cred
, struct proc
* p
));
int msdosfs_read
__P((struct vnode
* vp
, struct uio
* uio
, int ioflag
, struct ucred
* cred
));
int msdosfs_write
__P((struct vnode
* vp
, struct uio
* uio
, int ioflag
, struct ucred
* cred
));
int msdosfs_ioctl
__P((struct vnode
* vp
, int command
, caddr_t data
, int fflag
, struct ucred
* cred
, struct proc
* p
));
int msdosfs_select
__P((struct vnode
* vp
, int which
, int fflags
, struct ucred
* cred
, struct proc
* p
));
int msdosfs_mmap
__P((struct vnode
* vp
, int fflags
, struct ucred
* cred
, struct proc
* p
));
int msdosfs_fsync
__P((struct vnode
* vp
, int fflags
, struct ucred
* cred
, int waitfor
, struct proc
* p
));
int msdosfs_seek
__P((struct vnode
* vp
, off_t oldoff
, off_t newoff
, struct ucred
* cred
));
int msdosfs_remove
__P((struct nameidata
* ndp
, struct proc
* p
));
int msdosfs_link
__P((struct vnode
* vp
, struct nameidata
* ndp
, struct proc
* p
));
int msdosfs_rename
__P((struct nameidata
* fndp
, struct nameidata
* tdnp
, struct proc
* p
));
int msdosfs_mkdir
__P((struct nameidata
* ndp
, struct vattr
* vap
, struct proc
* p
));
int msdosfs_rmdir
__P((struct nameidata
* ndp
, struct proc
* p
));
int msdosfs_symlink
__P((struct nameidata
* ndp
, struct vattr
* vap
, char *target
, struct proc
* p
));
int msdosfs_readdir
__P((struct vnode
* vp
, struct uio
* uio
, struct ucred
* cred
, int *eofflagp
, u_int
* cookies
, int ncookies
));
int msdosfs_readlink
__P((struct vnode
* vp
, struct uio
* uio
, struct ucred
* cred
));
int msdosfs_abortop
__P((struct nameidata
* ndp
));
int msdosfs_inactive
__P((struct vnode
* vp
, struct proc
* p
));
int msdosfs_reclaim
__P((struct vnode
* vp
));
int msdosfs_lock
__P((struct vnode
* vp
));
int msdosfs_unlock
__P((struct vnode
* vp
));
int msdosfs_bmap
__P((struct vnode
* vp
, daddr_t bn
, struct vnode
** vpp
, daddr_t
* bnp
));
int msdosfs_strategy
__P((struct buf
* bp
));
int msdosfs_print
__P((struct vnode
* vp
));
int msdosfs_islocked
__P((struct vnode
* vp
));
int msdosfs_advlock
__P((struct vnode
* vp
, caddr_t id
, int op
, struct flock
* fl
, int flags
));
* Internal service routine prototypes.
int deget
__P((struct msdosfsmount
* pmp
, u_long dirclust
, u_long diroffset
, struct direntry
* direntptr
, struct denode
** depp
));
#endif /* defined(KERNEL) */