xnu-344.tar.gz

[apple/xnu.git] / bsd / hfs / hfs.h

/*
 * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */

#ifndef __HFS__
#define __HFS__

#include <sys/appleapiopts.h>

#ifdef KERNEL
#ifdef __APPLE_API_PRIVATE
#include <sys/param.h>
#include <sys/lock.h>
#include <sys/queue.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/quota.h>
#include <sys/dirent.h>

#include <hfs/hfs_format.h>
#include <hfs/hfs_catalog.h>
#include <hfs/hfs_cnode.h>
#include <hfs/hfs_macos_defs.h>
#include <hfs/hfs_encodings.h>


struct uio;		// This is more effective than #include <sys/uio.h> in case KERNEL is undefined...
struct hfslockf;	/* For advisory locking */

/*
 *	Just reported via MIG interface.
 */
#define VERSION_STRING	"hfs-2 (4-12-99)"

#define HFS_LINK_MAX	32767

#define HFS_MAX_DEFERED_ALLOC	(1024*1024)


enum { kMDBSize = 512 };				/* Size of I/O transfer to read entire MDB */

enum { kMasterDirectoryBlock = 2 };			/* MDB offset on disk in 512-byte blocks */
enum { kMDBOffset = kMasterDirectoryBlock * 512 };	/* MDB offset on disk in bytes */

enum {
	kUnknownID = 0,
	kRootParID = 1,
	kRootDirID = 2
};

enum {
	kDataFork,
	kRsrcFork,
	kDirectory
};

/* number of locked buffer caches to hold for b-tree meta data */
#define kMaxLockedMetaBuffers		32		

/*
 *	File type and creator for symbolic links
 */
enum {
	kSymLinkFileType  = 0x736C6E6B,	/* 'slnk' */
	kSymLinkCreator   = 0x72686170	/* 'rhap' */
};


extern struct timezone gTimeZone;


/* How many free extents to cache per volume */
#define kMaxFreeExtents		10

/*
 * HFS_MINFREE gives the minimum acceptable percentage
 * of file system blocks which may be free (but this
 * minimum will never exceed HFS_MAXRESERVE bytes). If
 * the free block count drops below this level only the
 * superuser may continue to allocate blocks.
 */
#define HFS_MINFREE		1
#define HFS_MAXRESERVE		(u_int64_t)(250*1024*1024)

/* Internal Data structures*/

struct vcb_t {
    u_int16_t 			vcbSigWord;
    int16_t 			vcbAtrb;
    int16_t			vcbFlags;
    int16_t 			vcbspare;

    u_int32_t 			vcbCrDate;
    u_int32_t 			vcbLsMod;
    u_int32_t 			vcbVolBkUp;

    int32_t 			vcbFilCnt;
    int32_t 			vcbDirCnt;
    u_int32_t 			blockSize;	/* size of allocation blocks */
    u_int32_t 			totalBlocks;	/* total allocation blocks */
    u_int32_t 			freeBlocks;	/* free allocation blocks */
    u_int32_t 			nextAllocation;	/* start of next allocation search */
    int32_t 			vcbClpSiz;
    u_int32_t 			vcbNxtCNID;
	u_int32_t 		vcbCNIDGen;
	int32_t 		vcbWrCnt;

    int32_t 			vcbFndrInfo[8];

    u_int64_t 			encodingsBitmap;	/* HFS Plus only */

    u_int16_t 			vcbNmFls;		/* HFS only */
    u_int16_t 			vcbNmRtDirs;		/* HFS only */
    int16_t 			vcbVBMSt;		/* HFS only */
    int16_t 			vcbAlBlSt;		/* HFS only */

    struct vnode *		extentsRefNum;
    struct vnode *		catalogRefNum;
    struct vnode *		allocationsRefNum;

    u_int8_t		 	vcbVN[256];		/* volume name in UTF-8 */
    u_int32_t	 		volumeNameEncodingHint;
    u_int32_t 			hfsPlusIOPosOffset;	/* Disk block where HFS+ starts */
    u_int32_t 			vcbVBMIOSize;		/* volume bitmap I/O size */

    /* cache of largest known free extents */
    u_int32_t			vcbFreeExtCnt;
    HFSPlusExtentDescriptor vcbFreeExt[kMaxFreeExtents];

    u_int32_t		reserveBlocks;		/* free block reserve */
    u_int32_t		loanedBlocks;		/* blocks on loan for delayed allocations */

    u_int32_t 			localCreateDate;	/* creation times for HFS+ volumes are in local time */
    simple_lock_data_t	vcbSimpleLock;		/* simple lock to allow concurrent access to vcb data */
};
typedef struct vcb_t ExtendedVCB;


#define kHFS_DamagedVolume  0x1	/* This volume has errors, unmount dirty */

/* XXX */
#define MARK_VOLUMEDAMAGED(fcb) 

/*
 * NOTE: The code relies on being able to cast an ExtendedVCB* to a vfsVCB* in order
 *	 to gain access to the mount point pointer from a pointer
 *	 to an ExtendedVCB.  DO NOT INSERT OTHER FIELDS BEFORE THE vcb FIELD!!
 *
 * vcbFlags, vcbLsMod, vcbFilCnt, vcbDirCnt, vcbNxtCNID, etc
 * are locked by the hfs_lock simple lock.
 */
typedef struct vfsVCB {
    ExtendedVCB			vcb_vcb;
    struct hfsmount		*vcb_hfsmp;				/* Pointer to hfsmount structure */
} vfsVCB_t;



/* This structure describes the HFS specific mount structure data. */
typedef struct hfsmount {
	u_int8_t			hfs_fs_ronly;			/* Whether this was mounted as read-initially  */
	u_int8_t			hfs_unknownpermissions;	/* Whether this was mounted with MNT_UNKNOWNPERMISSIONS */
	u_int8_t			hfs_media_writeable;
	
	/* Physical Description */
	u_long				hfs_phys_block_count;	/* Num of PHYSICAL blocks of volume */
	u_long				hfs_phys_block_size;	/* Always a multiple of 512 */

	/* Access to VFS and devices */
	struct mount		*hfs_mp;				/* filesystem vfs structure */
	struct vnode		*hfs_devvp;				/* block device mounted vnode */
	dev_t				hfs_raw_dev;			/* device mounted */
	struct netexport	hfs_export;				/* Export information */
	u_int32_t			hfs_logBlockSize;		/* Size of buffer cache buffer for I/O */
	
	/* Default values for HFS standard and non-init access */
	uid_t				hfs_uid;				/* uid to set as owner of the files */
	gid_t				hfs_gid;				/* gid to set as owner of the files */
	mode_t				hfs_dir_mask;			/* mask to and with directory protection bits */
	mode_t				hfs_file_mask;			/* mask to and with file protection bits */
	u_long				hfs_encoding;			/* Defualt encoding for non hfs+ volumes */	

	/* simple lock for shared meta renaming */
	simple_lock_data_t	hfs_renamelock;

	/* HFS Specific */
	struct vfsVCB		hfs_vcb;
	struct cat_desc		hfs_privdir_desc;
	struct cat_attr		hfs_privdir_attr;
	u_int32_t		hfs_metadata_createdate;
	hfs_to_unicode_func_t	hfs_get_unicode;
	unicode_to_hfs_func_t	hfs_get_hfsname;
 
	struct quotafile	hfs_qfiles[MAXQUOTAS];    /* quota files */
} hfsmount_t;

#define hfs_private_metadata_dir	hfs_privdir_desc.cd_cnid

#define MAXHFSVNODELEN		31


typedef struct filefork FCB;


#define MAKE_INODE_NAME(name,linkno) \
	    (void) sprintf((name), "%s%d", HFS_INODE_PREFIX, (linkno))

/*
 *	Write check macro
 */
#define	WRITE_CK(VNODE, FUNC_NAME)	{				\
    if ((VNODE)->v_mount->mnt_flag & MNT_RDONLY) {			\
        DBG_ERR(("%s: ATTEMPT TO WRITE A READONLY VOLUME\n", 	\
                 FUNC_NAME));	\
                     return(EROFS);							\
    }									\
}

/* structure to hold a "." or ".." directory entry (12 bytes) */
typedef struct hfsdotentry {
	u_int32_t	d_fileno;	/* unique file number */
	u_int16_t	d_reclen;	/* length of this structure */
	u_int8_t	d_type;		/* dirent file type */
	u_int8_t	d_namelen;	/* len of filename */
	char		d_name[4];	/* "." or ".." */
} hfsdotentry;

#define HFS_AVERAGE_NAME_SIZE	22
#define AVERAGE_HFSDIRENTRY_SIZE  (8+HFS_AVERAGE_NAME_SIZE+4)
#define MAX_HFSDIRENTRY_SIZE	sizeof(struct dirent)

#define DIRENTRY_SIZE(namlen) \
    ((sizeof(struct dirent) - (NAME_MAX+1)) + (((namlen)+1 + 3) &~ 3))


enum {
	kCatalogFolderNode = 1,
	kCatalogFileNode = 2
};

/* 
 * CatalogNodeData has same layout as the on-disk HFS Plus file/dir records.
 * Classic hfs file/dir records are converted to match this layout.
 * 
 * The cnd_extra padding allows big hfs plus thread records (520 bytes max)
 * to be read onto this stucture during a cnid lookup.
 *
 */
struct CatalogNodeData {
	int16_t			cnd_type;
	u_int16_t		cnd_flags;
	u_int32_t		cnd_valence;	/* dirs only */
	u_int32_t		cnd_nodeID;
	u_int32_t		cnd_createDate;
	u_int32_t		cnd_contentModDate;
	u_int32_t		cnd_attributeModDate;
	u_int32_t		cnd_accessDate;
	u_int32_t		cnd_backupDate;
	u_int32_t 		cnd_ownerID;
	u_int32_t 		cnd_groupID;
	u_int8_t 		cnd_adminFlags;  /* super-user changeable flags */
	u_int8_t 		cnd_ownerFlags;  /* owner changeable flags */
	u_int16_t 		cnd_mode;        /* file type + permission bits */
	union {
	    u_int32_t	cndu_iNodeNum;   /* indirect links only */
	    u_int32_t	cndu_linkCount;  /* indirect nodes only */
	    u_int32_t 	cndu_rawDevice;  /* special files (FBLK and FCHR) only */
	} cnd_un;
	u_int8_t		cnd_finderInfo[32];
	u_int32_t 		cnd_textEncoding;
	u_int32_t		cnd_reserved;
	HFSPlusForkData	cnd_datafork;
	HFSPlusForkData	cnd_rsrcfork;
	u_int32_t	cnd_iNodeNumCopy;
	u_int32_t	cnd_linkCNID;	/* for hard links only */
	u_int8_t	cnd_extra[264];	/* make struct at least 520 bytes long */
};
typedef struct CatalogNodeData CatalogNodeData;

#define	cnd_iNodeNum		cnd_un.cndu_iNodeNum
#define	cnd_linkCount		cnd_un.cndu_linkCount
#define	cnd_rawDevice		cnd_un.cndu_rawDevice



enum { kHFSPlusMaxFileNameBytes = kHFSPlusMaxFileNameChars * 3 };

enum { kdirentMaxNameBytes = NAME_MAX };


/* macro to determine if hfs or hfsplus */
#define ISHFSPLUS(VCB) ((VCB)->vcbSigWord == kHFSPlusSigWord)
#define ISHFS(VCB) ((VCB)->vcbSigWord == kHFSSigWord)


/*
 * Various ways to acquire a VFS mount point pointer:
 */
#define VTOVFS(VP) ((VP)->v_mount)
#define HFSTOVFS(HFSMP) ((HFSMP)->hfs_mp)
#define VCBTOVFS(VCB) (((struct vfsVCB *)(VCB))->vcb_hfsmp->hfs_mp)

/*
 * Various ways to acquire an HFS mount point pointer:
 */
#define VTOHFS(VP) ((struct hfsmount *)((VP)->v_mount->mnt_data))
#define	VFSTOHFS(MP) ((struct hfsmount *)(MP)->mnt_data)	
#define VCBTOHFS(VCB) (((struct vfsVCB *)(VCB))->vcb_hfsmp)

/*
 * Various ways to acquire a VCB pointer:
 */
#define VTOVCB(VP) (&(((struct hfsmount *)((VP)->v_mount->mnt_data))->hfs_vcb.vcb_vcb))
#define VFSTOVCB(MP) (&(((struct hfsmount *)(MP)->mnt_data)->hfs_vcb.vcb_vcb))
#define HFSTOVCB(HFSMP) (&(HFSMP)->hfs_vcb.vcb_vcb)


#define E_NONE	0
#define kHFSBlockSize 512

/*
 * Macros for getting the MDB/VH sector and offset
 */
#define HFS_PRI_SECTOR(blksize)          (1024 / (blksize))
#define HFS_PRI_OFFSET(blksize)          ((blksize) > 1024 ? 1024 : 0)

#define HFS_ALT_SECTOR(blksize, blkcnt)  (((blkcnt) - 1) - (512 / (blksize)))
#define HFS_ALT_OFFSET(blksize)          ((blksize) > 1024 ? (blksize) - 1024 : 0)

/*
 *	This is the straight GMT conversion constant:
 *	00:00:00 January 1, 1970 - 00:00:00 January 1, 1904
 *	(3600 * 24 * ((365 * (1970 - 1904)) + (((1970 - 1904) / 4) + 1)))
 */
#define MAC_GMT_FACTOR		2082844800UL


u_int32_t to_bsd_time(u_int32_t hfs_time);
u_int32_t to_hfs_time(u_int32_t bsd_time);

int hfs_flushfiles(struct mount *mp, int flags, struct proc *p);
int hfs_flushvolumeheader(struct hfsmount *hfsmp, int waitfor, int altflush);
#define HFS_ALTFLUSH	1

short hfsUnmount(struct hfsmount *hfsmp, struct proc *p);


extern int hfs_getcnode(struct hfsmount *hfsmp, cnid_t cnid, struct cat_desc *descp,
			int wantrsrc, struct cat_attr *attrp, struct cat_fork *forkp,
			struct vnode **vpp);

extern int hfs_getnewvnode(struct hfsmount *hfsmp, struct cnode *cp,
                           struct cat_desc *descp, int wantrsrc, struct cat_attr *attrp,
                           struct cat_fork *forkp, struct vnode **vpp);

extern int hfs_metafilelocking(struct hfsmount *hfsmp, u_long fileID, u_int flags, struct proc *p);

extern u_int32_t hfs_freeblks(struct hfsmount * hfsmp, int wantreserve);


short MacToVFSError(OSErr err);

extern int hfs_owner_rights(struct hfsmount *hfsmp, uid_t cnode_uid, struct ucred *cred,
		struct proc *p, int invokesuperuserstatus);

u_long FindMetaDataDirectory(ExtendedVCB *vcb);

#define  kMaxSecsForFsync	5
#define  HFS_SYNCTRANS		1

extern int hfs_btsync(struct vnode *vp, int sync_transaction);

short make_dir_entry(FCB **fileptr, char *name, u_int32_t fileID);


unsigned long BestBlockSizeFit(unsigned long allocationBlockSize,
                               unsigned long blockSizeLimit,
                               unsigned long baseMultiple);

OSErr	hfs_MountHFSVolume(struct hfsmount *hfsmp, HFSMasterDirectoryBlock *mdb,
		struct proc *p);
OSErr	hfs_MountHFSPlusVolume(struct hfsmount *hfsmp, HFSPlusVolumeHeader *vhp,
		off_t embeddedOffset, u_int64_t disksize, struct proc *p);

int hfs_getconverter(u_int32_t encoding, hfs_to_unicode_func_t *get_unicode,
		     unicode_to_hfs_func_t *get_hfsname);

int hfs_relconverter(u_int32_t encoding);

int hfs_to_utf8(ExtendedVCB *vcb, Str31 hfs_str, ByteCount maxDstLen,
		ByteCount *actualDstLen, unsigned char* dstStr);

int utf8_to_hfs(ExtendedVCB *vcb, ByteCount srcLen, const unsigned char* srcStr,
		Str31 dstStr);

int mac_roman_to_utf8(Str31 hfs_str, ByteCount maxDstLen, ByteCount *actualDstLen,
		unsigned char* dstStr);

int utf8_to_mac_roman(ByteCount srcLen, const unsigned char* srcStr, Str31 dstStr);

u_int32_t hfs_pickencoding(const u_int16_t *src, int len);

enum volop {VOL_UPDATE, VOL_MKDIR, VOL_RMDIR, VOL_MKFILE, VOL_RMFILE};

extern int hfs_volupdate(struct hfsmount *hfsmp, enum volop op, int inroot);

extern void hfs_setencodingbits(struct hfsmount *hfsmp, u_int32_t encoding);


extern void replace_desc(struct cnode *cp, struct cat_desc *cdp);

#endif /* __APPLE_API_PRIVATE */
#endif /* KERNEL */
#endif /* __HFS__ */