X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/de355530ae67247cbd0da700edb3a2a1dae884c2..3e170ce000f1506b7b5d2c5c7faec85ceabb573d:/bsd/sys/namei.h?ds=inline diff --git a/bsd/sys/namei.h b/bsd/sys/namei.h index 552dc822b..57b577d90 100644 --- a/bsd/sys/namei.h +++ b/bsd/sys/namei.h @@ -1,23 +1,29 @@ /* - * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2014 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@ */ /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ /* @@ -60,53 +66,45 @@ #include -#ifdef __APPLE_API_UNSTABLE +#ifdef KERNEL +#define LOCKLEAF 0x0004 /* lock inode on return */ +#define LOCKPARENT 0x0008 /* want parent vnode returned */ +#define WANTPARENT 0x0010 /* want parent vnode returned */ +#endif + + +#ifdef BSD_KERNEL_PRIVATE + +/* VFS Supports "/..namedfork/rsrc" access. */ +#define NAMEDRSRCFORK NAMEDSTREAMS + #include #include +#include +#include +#include -/* - * Lookup parameters: this structure describes the subset of - * information from the nameidata structure that is passed - * through the VOP interface. - */ -struct componentname { - /* - * Arguments to lookup. - */ - u_long cn_nameiop; /* namei operation */ - u_long cn_flags; /* flags to namei */ - struct proc *cn_proc; /* process requesting lookup */ - struct ucred *cn_cred; /* credentials */ - /* - * Shared between lookup and commit routines. - */ - char *cn_pnbuf; /* pathname buffer */ - long cn_pnlen; /* length of allocated buffer */ - char *cn_nameptr; /* pointer to looked up name */ - long cn_namelen; /* length of looked up component */ - u_long cn_hash; /* hash value of looked up name */ - long cn_consume; /* chars to consume in lookup() */ -}; +#define PATHBUFLEN 256 /* * Encapsulation of namei parameters. */ -struct nameidata { +struct nameidata { /* * Arguments to namei/lookup. */ - caddr_t ni_dirp; /* pathname pointer */ + user_addr_t ni_dirp; /* pathname pointer */ enum uio_seg ni_segflg; /* location of pathname */ - /* u_long ni_nameiop; namei operation */ - /* u_long ni_flags; flags to namei */ - /* struct proc *ni_proc; process requesting lookup */ +#if CONFIG_TRIGGERS + enum path_operation ni_op; /* intended operation, see enum path_operation in vnode.h */ +#endif /* CONFIG_TRIGGERS */ /* * Arguments to lookup. */ - /* struct ucred *ni_cred; credentials */ struct vnode *ni_startdir; /* starting directory */ struct vnode *ni_rootdir; /* logical root directory */ + struct vnode *ni_usedvp; /* directory passed in via USEDVP */ /* * Results: returned from/manipulated by lookup */ @@ -117,104 +115,164 @@ struct nameidata { */ u_int ni_pathlen; /* remaining chars in path */ char *ni_next; /* next location in pathname */ + char ni_pathbuf[PATHBUFLEN]; u_long ni_loopcnt; /* count of symlinks encountered */ + struct componentname ni_cnd; + int32_t ni_flag; + int ni_ncgeneration; /* For a batched vnop, grab generation beforehand */ }; -#ifdef KERNEL -/* - * namei operations +#define NAMEI_CONTLOOKUP 0x002 /* Continue processing a lookup which was partially processed in a compound VNOP */ +#define NAMEI_TRAILINGSLASH 0x004 /* There was at least one trailing slash after last component */ +#define NAMEI_UNFINISHED 0x008 /* We broke off a lookup to do a compound op */ +/* + * XXX Hack: we need to encode the intended VNOP in order to + * be able to include information about which operations a filesystem + * supports in the decision to break off a lookup early. */ -#define LOOKUP 0 /* perform name lookup only */ -#define CREATE 1 /* setup for file creation */ -#define DELETE 2 /* setup for file deletion */ -#define RENAME 3 /* setup for file renaming */ -#define OPMASK 3 /* mask for operation */ +#define NAMEI_COMPOUNDOPEN 0x010 +#define NAMEI_COMPOUNDREMOVE 0x020 +#define NAMEI_COMPOUNDMKDIR 0x040 +#define NAMEI_COMPOUNDRMDIR 0x080 +#define NAMEI_COMPOUNDRENAME 0x100 +#define NAMEI_COMPOUND_OP_MASK (NAMEI_COMPOUNDOPEN | NAMEI_COMPOUNDREMOVE | NAMEI_COMPOUNDMKDIR | NAMEI_COMPOUNDRMDIR | NAMEI_COMPOUNDRENAME) + +#ifdef KERNEL /* * namei operational modifier flags, stored in ni_cnd.flags + * Also includes LOCKLEAF, LOCKPARENT, and WANTPARENT flags, defined above. */ -#define LOCKLEAF 0x0004 /* lock inode on return */ -#define LOCKPARENT 0x0008 /* want parent vnode returned locked */ -#define WANTPARENT 0x0010 /* want parent vnode returned unlocked */ -#define NOCACHE 0x0020 /* name must not be left in cache */ -#define FOLLOW 0x0040 /* follow symbolic links */ -#define NOFOLLOW 0x0000 /* do not follow symbolic links (pseudo) */ -#define MODMASK 0x00fc /* mask of operational modifiers */ +#define NOCACHE 0x00000020 /* name must not be left in cache */ +#define NOFOLLOW 0x00000000 /* do not follow symbolic links (pseudo) */ +/* public FOLLOW 0x00000040 see vnode.h */ +#define SHAREDLEAF 0x00000080 /* OK to have shared leaf lock */ +#define MODMASK 0x100000fc /* mask of operational modifiers */ /* * Namei parameter descriptors. * - * SAVENAME may be set by either the callers of namei or by VOP_LOOKUP. - * If the caller of namei sets the flag (for example execve wants to - * know the name of the program that is being executed), then it must - * free the buffer. If VOP_LOOKUP sets the flag, then the buffer must - * be freed by either the commit routine or the VOP_ABORT routine. * SAVESTART is set only by the callers of namei. It implies SAVENAME * plus the addition of saving the parent directory that contains the * name in ni_startdir. It allows repeated calls to lookup for the * name being sought. The caller is responsible for releasing the * buffer and for vrele'ing ni_startdir. */ -#define NOCROSSMOUNT 0x000100 /* do not cross mount points */ -#define RDONLY 0x000200 /* lookup with read-only semantics */ -#define HASBUF 0x000400 /* has allocated pathname buffer */ -#define SAVENAME 0x000800 /* save pathanme buffer */ -#define SAVESTART 0x001000 /* save starting directory */ -#define ISDOTDOT 0x002000 /* current component name is .. */ -#define MAKEENTRY 0x004000 /* entry is to be added to name cache */ -#define ISLASTCN 0x008000 /* this is last component of pathname */ -#define ISSYMLINK 0x010000 /* symlink needs interpretation */ -#define ISWHITEOUT 0x020000 /* found whiteout */ -#define DOWHITEOUT 0x040000 /* do whiteouts */ -#define WILLBEDIR 0x080000 /* new files will be dirs; allow trailing / */ -#define NODELETEBUSY 0x800000 /* donot delete busy files (Carbon semantic) */ -#define PARAMASK 0x0fff00 /* mask of parameter descriptors */ +#define SAVENAME 0 /* save pathanme buffer ***obsolete */ +#define NOCROSSMOUNT 0x00000100 /* do not cross mount points */ +#define RDONLY 0x00000200 /* lookup with read-only semantics */ +#define HASBUF 0x00000400 /* has allocated pathname buffer */ +#define DONOTAUTH 0x00000800 /* do not authorize during lookup */ +#define SAVESTART 0x00001000 /* save starting directory */ +/* public ISDOTDOT 0x00002000 see vnode.h */ +/* public MAKEENTRY 0x00004000 see vnode.h */ +/* public ISLASTCN 0x00008000 see vnode.h */ +#define ISSYMLINK 0x00010000 /* symlink needs interpretation */ +/* public ISWHITEOUT 0x00020000 see vnode.h */ +/* public DOWHITEOUT 0x00040000 see vnode.h */ +#define WILLBEDIR 0x00080000 /* new files will be dirs; allow trailing / */ +#define AUDITVNPATH1 0x00100000 /* audit the path/vnode info */ +#define AUDITVNPATH2 0x00200000 /* audit the path/vnode info */ +#define USEDVP 0x00400000 /* start the lookup at ndp.ni_dvp */ +#define CN_VOLFSPATH 0x00800000 /* user path was a volfs style path */ +#define UNIONCREATED 0x02000000 /* union fs creation of vnode */ +#if NAMEDRSRCFORK +#define CN_WANTSRSRCFORK 0x04000000 +#define CN_ALLOWRSRCFORK 0x08000000 +#endif +#if CONFIG_SECLUDED_RENAME +#ifdef BSD_KERNEL_PRIVATE +#define CN_SECLUDE_RENAME 0x10000000 /*rename iff ￢(hard-linked ∨ opened ∨ mmaped)*/ +#endif +#endif +#define CN_NBMOUNTLOOK 0x20000000 /* do not block for cross mount lookups */ +#ifdef BSD_KERNEL_PRIVATE +#define CN_SKIPNAMECACHE 0x40000000 /* skip cache during lookup(), allow FS to handle all components */ +#endif + /* * Initialization of an nameidata structure. */ -#define NDINIT(ndp, op, flags, segflg, namep, p) { \ + +#if CONFIG_TRIGGERS +/* Note: vnode triggers require more precise path operation (ni_op) */ + +#define NDINIT(ndp, op, pop, flags, segflg, namep, ctx) { \ (ndp)->ni_cnd.cn_nameiop = op; \ + (ndp)->ni_op = pop; \ (ndp)->ni_cnd.cn_flags = flags; \ - (ndp)->ni_segflg = segflg; \ + if ((segflg) == UIO_USERSPACE) { \ + (ndp)->ni_segflg = ((IS_64BIT_PROCESS(vfs_context_proc(ctx))) ? UIO_USERSPACE64 : UIO_USERSPACE32); \ + } \ + else { \ + (ndp)->ni_segflg = segflg; \ + } \ (ndp)->ni_dirp = namep; \ - (ndp)->ni_cnd.cn_proc = p; \ + (ndp)->ni_cnd.cn_context = ctx; \ + (ndp)->ni_flag = 0; \ + (ndp)->ni_cnd.cn_ndp = (ndp); \ } +#else +#define NDINIT(ndp, op, _unused_, flags, segflg, namep, ctx) { \ + (ndp)->ni_cnd.cn_nameiop = op; \ + (ndp)->ni_cnd.cn_flags = flags; \ + if ((segflg) == UIO_USERSPACE) { \ + (ndp)->ni_segflg = ((IS_64BIT_PROCESS(vfs_context_proc(ctx))) ? UIO_USERSPACE64 : UIO_USERSPACE32); \ + } \ + else { \ + (ndp)->ni_segflg = segflg; \ + } \ + (ndp)->ni_dirp = namep; \ + (ndp)->ni_cnd.cn_context = ctx; \ + (ndp)->ni_flag = 0; \ + (ndp)->ni_cnd.cn_ndp = (ndp); \ +} +#endif /* CONFIG_TRIGGERS */ + #endif /* KERNEL */ /* * This structure describes the elements in the cache of recent - * names looked up by namei. NCHNAMLEN is sized to make structure - * size a power of two to optimize malloc's. Minimum reasonable - * size is 15. + * names looked up by namei. */ - -#define NCHNAMLEN 31 /* maximum name segment length we bother with */ - struct namecache { - LIST_ENTRY(namecache) nc_hash; /* hash chain */ - TAILQ_ENTRY(namecache) nc_lru; /* LRU chain */ - struct vnode *nc_dvp; /* vnode of parent of name */ - u_long nc_dvpid; /* capability number of nc_dvp */ - struct vnode *nc_vp; /* vnode the name refers to */ - u_long nc_vpid; /* capability number of nc_vp */ - char nc_nlen; /* length of name */ - char nc_name[NCHNAMLEN]; /* segment name */ + TAILQ_ENTRY(namecache) nc_entry; /* chain of all entries */ + LIST_ENTRY(namecache) nc_hash; /* hash chain */ + LIST_ENTRY(namecache) nc_child; /* chain of ncp's that are children of a vp */ + union { + LIST_ENTRY(namecache) nc_link; /* chain of ncp's that 'name' a vp */ + TAILQ_ENTRY(namecache) nc_negentry; /* chain of ncp's that 'name' a vp */ + } nc_un; + vnode_t nc_dvp; /* vnode of parent of name */ + vnode_t nc_vp; /* vnode the name refers to */ + unsigned int nc_hashval; /* hashval of stringname */ + const char *nc_name; /* pointer to segment name in string cache */ }; + #ifdef KERNEL -struct mount; -extern u_long nextvnodeid; -int namei __P((struct nameidata *ndp)); -int lookup __P((struct nameidata *ndp)); -int relookup __P((struct vnode *dvp, struct vnode **vpp, - struct componentname *cnp)); - -/* namecache function prototypes */ -int cache_lookup __P((struct vnode *dvp, struct vnode **vpp, - struct componentname *cnp)); -void cache_enter __P((struct vnode *dvp, struct vnode *vpp, - struct componentname *cnp)); -void cache_purge __P((struct vnode *vp)); -void cache_purgevfs __P((struct mount *mp)); + +int namei(struct nameidata *ndp); +void nameidone(struct nameidata *); +int lookup(struct nameidata *ndp); +int relookup(struct vnode *dvp, struct vnode **vpp, + struct componentname *cnp); +int lookup_traverse_union(vnode_t dvp, vnode_t *new_dvp, vfs_context_t ctx); +void lookup_compound_vnop_post_hook(int error, vnode_t dvp, vnode_t vp, struct nameidata *ndp, int did_create); + +/* + * namecache function prototypes + */ +void cache_purgevfs(mount_t mp); +int cache_lookup_path(struct nameidata *ndp, struct componentname *cnp, vnode_t dp, + vfs_context_t context, int *dp_authorized, vnode_t last_dp); + +void vnode_cache_authorized_action(vnode_t vp, vfs_context_t context, kauth_action_t action); +void vnode_uncache_authorized_action(vnode_t vp, kauth_action_t action); +boolean_t vnode_cache_is_stale(vnode_t vp); +boolean_t vnode_cache_is_authorized(vnode_t vp, vfs_context_t context, kauth_action_t action); +int lookup_validate_creation_path(struct nameidata *ndp); +int namei_compound_available(vnode_t dp, struct nameidata *ndp); + #endif /* KERNEL */ /* @@ -224,12 +282,14 @@ struct nchstats { long ncs_goodhits; /* hits that we can really use */ long ncs_neghits; /* negative hits that we can use */ long ncs_badhits; /* hits we must drop */ - long ncs_falsehits; /* hits with id mismatch */ long ncs_miss; /* misses */ - long ncs_long; /* long names that ignore cache */ long ncs_pass2; /* names found with passes == 2 */ long ncs_2passes; /* number of times we attempt it */ + long ncs_stolen; + long ncs_enters; + long ncs_deletes; + long ncs_badvid; }; -#endif /* __APPLE_API_UNSTABLE */ +#endif /* BSD_KERNEL_PRIVATE */ #endif /* !_SYS_NAMEI_H_ */