X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/e5568f75972dfc723778653c11cb6b4dc825716a..143464d58d2bd6378e74eec636961ceb0d32fb91:/bsd/hfs/hfs_cnode.h diff --git a/bsd/hfs/hfs_cnode.h b/bsd/hfs/hfs_cnode.h index 6188156d3..9c45e7912 100644 --- a/bsd/hfs/hfs_cnode.h +++ b/bsd/hfs/hfs_cnode.h @@ -1,23 +1,29 @@ /* - * Copyright (c) 2002-2003 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2002-2012 Apple Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ + * @APPLE_OSREFERENCE_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 file contains Original Code and/or Modifications of Original Code + * as defined in and that are subject to the Apple Public Source License + * Version 2.0 (the 'License'). You may not use this file except in + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. + * + * The 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. + * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. + * Please see the License for the specific language governing rights and + * limitations under the License. * - * @APPLE_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ #ifndef _HFS_CNODE_H_ #define _HFS_CNODE_H_ @@ -27,14 +33,21 @@ #ifdef KERNEL #ifdef __APPLE_API_PRIVATE #include -#include #include #include #include #include +#include + #include #include +#if HFS_COMPRESSION +#include +#endif +#if CONFIG_PROTECT +#include +#endif /* @@ -42,45 +55,74 @@ * Reading or writing any of these fields requires holding cnode lock. */ struct filefork { - struct cnode *ff_cp; /* cnode associated with this fork */ - struct rl_head ff_invalidranges; /* Areas of disk that should read back as zeroes */ - long ff_evtonly_refs; /* number of vnode references used solely for events (O_EVTONLY) */ + struct cnode *ff_cp; /* cnode associated with this fork */ + struct rl_head ff_invalidranges; /* Areas of disk that should read back as zeroes */ union { - struct hfslockf *ffu_lockf; /* Head of byte-level lock list. */ - void *ffu_sysdata; /* private data for system files */ - char *ffu_symlinkptr; /* symbolic link pathname */ - } ff_un; - struct cat_fork ff_data; + void *ffu_sysfileinfo; /* additional info for system files */ + char *ffu_symlinkptr; /* symbolic link pathname */ + } ff_union; + struct cat_fork ff_data; /* fork data (size, extents) */ }; typedef struct filefork filefork_t; + +#define HFS_TEMPLOOKUP_NAMELEN 32 + +/* + * Catalog Lookup struct (runtime) + * + * This is used so that when we need to malloc a container for a catalog + * lookup operation, we can acquire memory for everything in one fell swoop + * as opposed to putting many of these objects on the stack. The cat_fork + * data structure can take up 100+bytes easily, and that can add to stack + * overhead. + * + * As a result, we use this to easily pass around the memory needed for a + * lookup operation. + */ +struct cat_lookup_buffer { + struct cat_desc lookup_desc; + struct cat_attr lookup_attr; + struct filefork lookup_fork; + struct componentname lookup_cn; + char lookup_name[HFS_TEMPLOOKUP_NAMELEN]; /* for open-unlinked paths only */ +}; + + /* Aliases for common fields */ -#define ff_size ff_data.cf_size -#define ff_clumpsize ff_data.cf_clump -#define ff_bytesread ff_data.cf_bytesread -#define ff_blocks ff_data.cf_blocks -#define ff_extents ff_data.cf_extents +#define ff_size ff_data.cf_size +#define ff_new_size ff_data.cf_new_size +#define ff_clumpsize ff_data.cf_clump +#define ff_bytesread ff_data.cf_bytesread +#define ff_blocks ff_data.cf_blocks +#define ff_extents ff_data.cf_extents #define ff_unallocblocks ff_data.cf_vblocks -#define ff_symlinkptr ff_un.ffu_symlinkptr -#define ff_lockf ff_un.ffu_lockf +#define ff_symlinkptr ff_union.ffu_symlinkptr +#define ff_sysfileinfo ff_union.ffu_sysfileinfo /* The btree code still needs these... */ -#define fcbEOF ff_size -#define fcbExtents ff_extents -#define fcbBTCBPtr ff_un.ffu_sysdata +#define fcbEOF ff_size +#define fcbExtents ff_extents +#define fcbBTCBPtr ff_sysfileinfo + +typedef u_int8_t atomicflag_t; /* - * Directory index entry + * Hardlink Origin (for hardlinked directories). */ -struct hfs_index { - SLIST_ENTRY(hfs_index) hi_link; - int hi_index; - void *hi_thread; /* thread that created index entry */ - char hi_name[1]; +struct linkorigin { + TAILQ_ENTRY(linkorigin) lo_link; /* chain */ + void * lo_thread; /* thread that performed the lookup */ + cnid_t lo_cnid; /* hardlink's cnid */ + cnid_t lo_parentcnid; /* hardlink's parent cnid */ }; +typedef struct linkorigin linkorigin_t; + +#define MAX_CACHED_ORIGINS 10 +#define MAX_CACHED_FILE_ORIGINS 8 /* * The cnode is used to represent each active (or recently active) @@ -89,22 +131,40 @@ struct hfs_index { * Reading or writing any of these fields requires holding c_lock. */ struct cnode { - struct lock__bsd__ c_lock; /* cnode's lock */ + lck_rw_t c_rwlock; /* cnode's lock */ + void * c_lockowner; /* cnode's lock owner (exclusive case only) */ + lck_rw_t c_truncatelock; /* protects file from truncation during read/write */ + void * c_truncatelockowner; /* truncate lock owner (exclusive case only) */ LIST_ENTRY(cnode) c_hash; /* cnode's hash chain */ u_int32_t c_flag; /* cnode's runtime flags */ + u_int32_t c_hflag; /* cnode's flags for maintaining hash - protected by global hash lock */ struct vnode *c_vp; /* vnode for data fork or dir */ struct vnode *c_rsrc_vp; /* vnode for resource fork */ - struct vnode *c_devvp; /* vnode for block I/O */ - dev_t c_dev; /* cnode's device */ - struct dquot *c_dquot[MAXQUOTAS]; /* cnode's quota info */ - struct klist c_knotes; /* knotes attached to this vnode */ - cnid_t c_childhint; /* catalog hint for children */ + struct dquot *c_dquot[MAXQUOTAS]; /* cnode's quota info */ + u_int32_t c_childhint; /* catalog hint for children (small dirs only) */ + u_int32_t c_dirthreadhint; /* catalog hint for directory's thread rec */ struct cat_desc c_desc; /* cnode's descriptor */ struct cat_attr c_attr; /* cnode's attributes */ - SLIST_HEAD(hfs_indexhead, hfs_index) c_indexlist; /* directory index list */ - long c_evtonly_refs; /* number of vnode references used solely for events (O_EVTONLY) */ + TAILQ_HEAD(hfs_originhead, linkorigin) c_originlist; /* hardlink origin cache */ + TAILQ_HEAD(hfs_hinthead, directoryhint) c_hintlist; /* readdir directory hint list */ + int16_t c_dirhinttag; /* directory hint tag */ + union { + int16_t cu_dirhintcnt; /* directory hint count */ + int16_t cu_syslockcount; /* system file use only */ + } c_union; + u_int32_t c_dirchangecnt; /* changes each insert/delete (in-core only) */ struct filefork *c_datafork; /* cnode's data fork */ struct filefork *c_rsrcfork; /* cnode's rsrc fork */ + atomicflag_t c_touch_acctime; + atomicflag_t c_touch_chgtime; + atomicflag_t c_touch_modtime; +#if HFS_COMPRESSION + decmpfs_cnode *c_decmp; +#endif /* HFS_COMPRESSION */ +#if CONFIG_PROTECT + cprotect_t c_cpentry; /* content protection data */ +#endif + }; typedef struct cnode cnode_t; @@ -116,54 +176,83 @@ typedef struct cnode cnode_t; #define c_fileid c_attr.ca_fileid #define c_mode c_attr.ca_mode -#define c_nlink c_attr.ca_nlink +#define c_linkcount c_attr.ca_linkcount #define c_uid c_attr.ca_uid #define c_gid c_attr.ca_gid -#define c_rdev c_attr.ca_rdev +#define c_rdev c_attr.ca_union1.cau_rdev #define c_atime c_attr.ca_atime #define c_mtime c_attr.ca_mtime -#define c_mtime_nsec c_attr.ca_mtime_nsec #define c_ctime c_attr.ca_ctime #define c_itime c_attr.ca_itime #define c_btime c_attr.ca_btime -#define c_flags c_attr.ca_flags +#define c_bsdflags c_attr.ca_flags #define c_finderinfo c_attr.ca_finderinfo -#define c_blocks c_attr.ca_blocks -#define c_entries c_attr.ca_entries +#define c_blocks c_attr.ca_union2.cau_blocks +#define c_entries c_attr.ca_union2.cau_entries #define c_zftimeout c_childhint +#define c_dirhintcnt c_union.cu_dirhintcnt +#define c_syslockcount c_union.cu_syslockcount -/* Runtime cnode flags (kept in c_flag) */ -#define C_ACCESS 0x00001 /* Access time update request */ -#define C_CHANGE 0x00002 /* Change time update request */ -#define C_UPDATE 0x00004 /* Modification time update request */ -#define C_MODIFIED 0x00008 /* CNode has been modified */ -#define C_RELOCATING 0x00010 /* CNode's fork is being relocated */ -#define C_NOEXISTS 0x00020 /* CNode has been deleted, catalog entry is gone */ -#define C_DELETED 0x00040 /* CNode has been marked to be deleted */ -#define C_HARDLINK 0x00080 /* CNode is a hard link */ +/* hash maintenance flags kept in c_hflag and protected by hfs_chash_mutex */ +#define H_ALLOC 0x00001 /* CNode is being allocated */ +#define H_ATTACH 0x00002 /* CNode is being attached to by another vnode */ +#define H_TRANSIT 0x00004 /* CNode is getting recycled */ +#define H_WAITING 0x00008 /* CNode is being waited for */ -#define C_ALLOC 0x00100 /* CNode is being allocated */ -#define C_WALLOC 0x00200 /* Waiting for allocation to finish */ -#define C_TRANSIT 0x00400 /* CNode is getting recycled */ -#define C_WTRANSIT 0x00800 /* Waiting for cnode getting recycled */ -#define C_NOBLKMAP 0x01000 /* CNode blocks cannot be mapped */ -#define C_WBLKMAP 0x02000 /* Waiting for block map */ -#define C_ZFWANTSYNC 0x04000 /* fsync requested and file has holes */ -#define C_VPREFHELD 0x08000 /* resource fork has done a vget() on c_vp (for its parent ptr) */ +/* Runtime cnode flags (kept in c_flag) */ +#define C_NEED_RVNODE_PUT 0x00001 /* Need to do a vnode_put on c_rsrc_vp after the unlock */ +#define C_NEED_DVNODE_PUT 0x00002 /* Need to do a vnode_put on c_vp after the unlock */ +#define C_ZFWANTSYNC 0x00004 /* fsync requested and file has holes */ +#define C_FROMSYNC 0x00008 /* fsync was called from sync */ + +#define C_MODIFIED 0x00010 /* CNode has been modified */ +#define C_NOEXISTS 0x00020 /* CNode has been deleted, catalog entry is gone */ +#define C_DELETED 0x00040 /* CNode has been marked to be deleted */ +#define C_HARDLINK 0x00080 /* CNode is a hard link (file or dir) */ + +#define C_FORCEUPDATE 0x00100 /* force the catalog entry update */ +#define C_HASXATTRS 0x00200 /* cnode has extended attributes */ +#define C_NEG_ENTRIES 0x00400 /* directory has negative name entries */ +/* + * For C_SSD_STATIC: SSDs may want to deal with the file payload data in a + * different manner knowing that the content is not likely to be modified. This is + * purely advisory at the HFS level, and is not maintained after the cnode goes out of core. + */ +#define C_SSD_STATIC 0x00800 /* Assume future writes contain static content */ + +#define C_NEED_DATA_SETSIZE 0x01000 /* Do a ubc_setsize(0) on c_rsrc_vp after the unlock */ +#define C_NEED_RSRC_SETSIZE 0x02000 /* Do a ubc_setsize(0) on c_vp after the unlock */ +#define C_DIR_MODIFICATION 0x04000 /* Directory is being modified, wait for lookups */ +#define C_ALWAYS_ZEROFILL 0x08000 /* Always zero-fill the file on an fsync */ + +#define C_RENAMED 0x10000 /* cnode was deleted as part of rename; C_DELETED should also be set */ +#define C_NEEDS_DATEADDED 0x20000 /* cnode needs date-added written to the finderinfo bit */ +#define C_BACKINGSTORE 0x40000 /* cnode is a backing store for an existing or currently-mounting filesystem */ +#define C_SWAPINPROGRESS 0x80000 /* cnode's data is about to be swapped. Issue synchronous cluster io */ + +/* + * For C_SSD_GREEDY_MODE: SSDs may want to write the file payload data using the greedy mode knowing + * that the content needs to be written out to the disk quicker than normal at the expense of storage efficiency. + * This is purely advisory at the HFS level, and is not maintained after the cnode goes out of core. + */ +#define C_SSD_GREEDY_MODE 0x100000 /* Assume future writes are recommended to be written in SLC mode */ -#define C_FROMSYNC 0x10000 /* fsync was called from sync */ -#define C_FORCEUPDATE 0x20000 /* force the catalog entry update */ +#define ZFTIMELIMIT (5 * 60) +/* + * The following is the "invisible" bit from the fdFlags field + * in the FndrFileInfo. + */ +enum { kFinderInvisibleMask = 1 << 14 }; -#define ZFTIMELIMIT (5 * 60) /* * Convert between cnode pointers and vnode pointers */ -#define VTOC(vp) ((struct cnode *)(vp)->v_data) +#define VTOC(vp) ((struct cnode *)vnode_fsnode((vp))) #define CTOV(cp,rsrc) (((rsrc) && S_ISREG((cp)->c_mode)) ? \ (cp)->c_rsrc_vp : (cp)->c_vp) @@ -180,11 +269,24 @@ typedef struct cnode cnode_t; VTOC((vp))->c_rsrcfork : \ VTOC((vp))->c_datafork) +#define VCTOF(vp, cp) ((vp) == (cp)->c_rsrc_vp ? \ + (cp)->c_rsrcfork : \ + (cp)->c_datafork) + #define FTOV(fp) ((fp) == FTOC(fp)->c_rsrcfork ? \ FTOC(fp)->c_rsrc_vp : \ FTOC(fp)->c_vp) -#define EVTONLYREFS(vp) ((vp->v_type == VREG) ? VTOF(vp)->ff_evtonly_refs : VTOC(vp)->c_evtonly_refs) +/* + * This is a helper function used for determining whether or not a cnode has become open + * unlinked in between the time we acquired its vnode and the time we acquire the cnode lock + * to start manipulating it. Due to the SMP nature of VFS, it is probably necessary to + * use this macro every time we acquire a cnode lock, as the content of the Cnode may have + * been modified in betweeen the lookup and a VNOP. Whether or not to call this is dependent + * upon the VNOP in question. Sometimes it is OK to use an open-unlinked file, for example, in, + * reading. But other times, such as on the source of a VNOP_RENAME, it should be disallowed. + */ +int hfs_checkdeleted(struct cnode *cp); /* * Test for a resource fork @@ -193,58 +295,137 @@ typedef struct cnode cnode_t; #define VNODE_IS_RSRC(vp) ((vp) == VTOC((vp))->c_rsrc_vp) - +#if HFS_COMPRESSION /* - * CTIMES should be an inline function... + * VTOCMP(vp) returns a pointer to vp's decmpfs_cnode; this could be NULL + * if the file is not compressed or if hfs_file_is_compressed() hasn't + * yet been called on this file. */ -#define C_TIMEMASK (C_ACCESS | C_CHANGE | C_UPDATE) +#define VTOCMP(vp) (VTOC((vp))->c_decmp) +int hfs_file_is_compressed(struct cnode *cp, int skiplock); +int hfs_uncompressed_size_of_compressed_file(struct hfsmount *hfsmp, struct vnode *vp, cnid_t fid, off_t *size, int skiplock); +int hfs_hides_rsrc(vfs_context_t ctx, struct cnode *cp, int skiplock); +int hfs_hides_xattr(vfs_context_t ctx, struct cnode *cp, const char *name, int skiplock); +#endif -#define C_CHANGEMASK (C_ACCESS | C_CHANGE | C_UPDATE | C_MODIFIED) - -#define ATIME_ACCURACY 1 #define ATIME_ONDISK_ACCURACY 300 -#define CTIMES(cp, t1, t2) { \ - if ((cp)->c_flag & C_TIMEMASK) { \ - /* \ - * Only do the update if it is more than just \ - * the C_ACCESS field being updated. \ - */ \ - if (((cp)->c_flag & C_CHANGEMASK) != C_ACCESS) { \ - if ((cp)->c_flag & C_ACCESS) { \ - (cp)->c_atime = (t1)->tv_sec; \ - } \ - if ((cp)->c_flag & C_UPDATE) { \ - (cp)->c_mtime = (t2)->tv_sec; \ - (cp)->c_mtime_nsec = (t2)->tv_usec * 1000; \ - } \ - if ((cp)->c_flag & C_CHANGE) { \ - (cp)->c_ctime = time.tv_sec; \ - } \ - (cp)->c_flag |= C_MODIFIED; \ - (cp)->c_flag &= ~C_TIMEMASK; \ - } \ - } \ -} - -/* This overlays the fid structure (see mount.h). */ + +/* This overlays the FileID portion of NFS file handles. */ struct hfsfid { - u_int16_t hfsfid_len; /* Length of structure. */ - u_int16_t hfsfid_pad; /* Force 32-bit alignment. */ - /* The following data is filesystem-dependent, up to MAXFIDSZ (16) bytes: */ u_int32_t hfsfid_cnid; /* Catalog node ID. */ u_int32_t hfsfid_gen; /* Generation number (create date). */ }; +/* Get new default vnode */ +extern int hfs_getnewvnode(struct hfsmount *hfsmp, struct vnode *dvp, struct componentname *cnp, + struct cat_desc *descp, int flags, struct cat_attr *attrp, + struct cat_fork *forkp, struct vnode **vpp, int *out_flags); + +/* Input flags for hfs_getnewvnode */ + +#define GNV_WANTRSRC 0x01 /* Request the resource fork vnode. */ +#define GNV_SKIPLOCK 0x02 /* Skip taking the cnode lock (when getting resource fork). */ +#define GNV_CREATE 0x04 /* The vnode is for a newly created item. */ +#define GNV_NOCACHE 0x08 /* Delay entering this item in the name cache */ + +/* Output flags for hfs_getnewvnode */ +#define GNV_CHASH_RENAMED 0x01 /* The cnode was renamed in-flight */ +#define GNV_CAT_DELETED 0x02 /* The cnode was deleted from the catalog */ +#define GNV_NEW_CNODE 0x04 /* We are vending out a newly initialized cnode */ +#define GNV_CAT_ATTRCHANGED 0x08 /* Something in struct cat_attr changed in between cat_lookups */ + +/* Touch cnode times based on c_touch_xxx flags */ +extern void hfs_touchtimes(struct hfsmount *, struct cnode *); +extern void hfs_write_dateadded (struct cat_attr *cattrp, u_int32_t dateadded); +extern u_int32_t hfs_get_dateadded (struct cnode *cp); + +/* Gen counter methods */ +extern void hfs_write_gencount(struct cat_attr *cattrp, uint32_t gencount); +extern uint32_t hfs_get_gencount(struct cnode *cp); +extern uint32_t hfs_get_gencount_from_blob (const uint8_t *finfoblob, mode_t mode); +extern uint32_t hfs_incr_gencount (struct cnode *cp); + +/* Document id methods */ +extern uint32_t hfs_get_document_id(struct cnode * /* cp */); +extern uint32_t hfs_get_document_id_from_blob(const uint8_t * /* finderinfo */, mode_t /* mode */); + +/* Zero-fill file and push regions out to disk */ +extern int hfs_filedone(struct vnode *vp, vfs_context_t context); + /* * HFS cnode hash functions. */ extern void hfs_chashinit(void); -extern void hfs_chashinsert(struct cnode *cp); -extern void hfs_chashremove(struct cnode *cp); -extern struct cnode * hfs_chashget(dev_t dev, ino_t inum, int wantrsrc, - struct vnode **vpp, struct vnode **rvpp); +extern void hfs_chashinit_finish(struct hfsmount *hfsmp); +extern void hfs_delete_chash(struct hfsmount *hfsmp); +extern int hfs_chashremove(struct hfsmount *hfsmp, struct cnode *cp); +extern void hfs_chash_abort(struct hfsmount *hfsmp, struct cnode *cp); +extern void hfs_chash_rehash(struct hfsmount *hfsmp, struct cnode *cp1, struct cnode *cp2); +extern void hfs_chashwakeup(struct hfsmount *hfsmp, struct cnode *cp, int flags); +extern void hfs_chash_mark_in_transit(struct hfsmount *hfsmp, struct cnode *cp); + +extern struct vnode * hfs_chash_getvnode(struct hfsmount *hfsmp, ino_t inum, int wantrsrc, + int skiplock, int allow_deleted); +extern struct cnode * hfs_chash_getcnode(struct hfsmount *hfsmp, ino_t inum, struct vnode **vpp, + int wantrsrc, int skiplock, int *out_flags, int *hflags); +extern int hfs_chash_snoop(struct hfsmount *, ino_t, int, int (*)(const struct cat_desc *, + const struct cat_attr *, void *), void *); +extern int hfs_valid_cnode(struct hfsmount *hfsmp, struct vnode *dvp, struct componentname *cnp, + cnid_t cnid, struct cat_attr *cattr, int *error); + +extern int hfs_chash_set_childlinkbit(struct hfsmount *hfsmp, cnid_t cnid); + +/* + * HFS cnode lock functions. + * + * HFS Locking Order: + * + * 1. cnode truncate lock (if needed) + * hfs_vnop_pagein/out can skip grabbing of this lock by flag option by + * HFS_LOCK_SKIP_IF_EXCLUSIVE if the truncate lock is already held exclusive + * by current thread from an earlier vnop. + * 2. cnode lock (in parent-child order if related, otherwise by address order) + * 3. journal (if needed) + * 4. system files (as needed) + * A. Catalog B-tree file + * B. Attributes B-tree file + * C. Startup file (if there is one) + * D. Allocation Bitmap file (always exclusive, supports recursion) + * E. Overflow Extents B-tree file (always exclusive, supports recursion) + * 5. hfs mount point (always last) + * + * + * I. HFS cnode hash lock (must not acquire any new locks while holding this lock, always taken last) + */ + + +enum hfs_locktype { + HFS_SHARED_LOCK = 1, + HFS_EXCLUSIVE_LOCK = 2 +}; + +/* Option flags for cnode and truncate lock functions */ +enum hfs_lockflags { + HFS_LOCK_DEFAULT = 0x0, /* Default flag, no options provided */ + HFS_LOCK_ALLOW_NOEXISTS = 0x1, /* Allow locking of all cnodes, including cnode marked deleted with no catalog entry */ + HFS_LOCK_SKIP_IF_EXCLUSIVE = 0x2 /* Skip locking if the current thread already holds the lock exclusive */ +}; +#define HFS_SHARED_OWNER (void *)0xffffffff + +int hfs_lock(struct cnode *, enum hfs_locktype, enum hfs_lockflags); +int hfs_lockpair(struct cnode *, struct cnode *, enum hfs_locktype); +int hfs_lockfour(struct cnode *, struct cnode *, struct cnode *, struct cnode *, + enum hfs_locktype, struct cnode **); + +void hfs_unlock(struct cnode *); +void hfs_unlockpair(struct cnode *, struct cnode *); +void hfs_unlockfour(struct cnode *, struct cnode *, struct cnode *, struct cnode *); + +void hfs_lock_truncate(struct cnode *, enum hfs_locktype, enum hfs_lockflags); +void hfs_unlock_truncate(struct cnode *, enum hfs_lockflags); +int hfs_try_trunclock(struct cnode *, enum hfs_locktype, enum hfs_lockflags); #endif /* __APPLE_API_PRIVATE */ #endif /* KERNEL */