X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/378393581903b274cb7a4d18e0d978071a6b592d..3e170ce000f1506b7b5d2c5c7faec85ceabb573d:/bsd/sys/namei.h diff --git a/bsd/sys/namei.h b/bsd/sys/namei.h index 775a41030..57b577d90 100644 --- a/bsd/sys/namei.h +++ b/bsd/sys/namei.h @@ -1,23 +1,29 @@ /* - * Copyright (c) 2000-2003 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 */ /* @@ -69,6 +75,10 @@ #ifdef BSD_KERNEL_PRIVATE +/* VFS Supports "/..namedfork/rsrc" access. */ +#define NAMEDRSRCFORK NAMEDSTREAMS + + #include #include #include @@ -80,12 +90,15 @@ /* * Encapsulation of namei parameters. */ -struct nameidata { +struct nameidata { /* * Arguments to namei/lookup. */ user_addr_t ni_dirp; /* pathname pointer */ enum uio_seg ni_segflg; /* location of pathname */ +#if CONFIG_TRIGGERS + enum path_operation ni_op; /* intended operation, see enum path_operation in vnode.h */ +#endif /* CONFIG_TRIGGERS */ /* * Arguments to lookup. */ @@ -106,16 +119,35 @@ struct nameidata { 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 */ }; +#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 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 NOCACHE 0x0020 /* name must not be left in cache */ -#define NOFOLLOW 0x0000 /* do not follow symbolic links (pseudo) */ -#define SHAREDLEAF 0x0080 /* OK to have shared leaf lock */ -#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. * @@ -125,48 +157,83 @@ struct nameidata { * name being sought. The caller is responsible for releasing the * buffer and for vrele'ing ni_startdir. */ +#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 SAVENAME 0x00000800 /* save pathanme 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 */ -#define DONOTAUTH 0x00020000 /* do not authorize during lookup */ +/* 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 PARAMASK 0x003fff00 /* mask of parameter descriptors */ -#define FSNODELOCKHELD 0x01000000 +#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, ctx) { \ + +#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; \ if ((segflg) == UIO_USERSPACE) { \ (ndp)->ni_segflg = ((IS_64BIT_PROCESS(vfs_context_proc(ctx))) ? UIO_USERSPACE64 : UIO_USERSPACE32); \ } \ - else if ((segflg) == UIO_SYSSPACE) { \ - (ndp)->ni_segflg = UIO_SYSSPACE32; \ + 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); \ +} +#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. */ - -#define NCHNAMLEN 31 /* maximum name segment length we bother with */ -#define NCHASHMASK 0x7fffffff - struct namecache { TAILQ_ENTRY(namecache) nc_entry; /* chain of all entries */ LIST_ENTRY(namecache) nc_hash; /* hash chain */ @@ -177,9 +244,8 @@ struct namecache { } nc_un; vnode_t nc_dvp; /* vnode of parent of name */ vnode_t nc_vp; /* vnode the name refers to */ - unsigned int nc_whiteout:1, /* name has whiteout applied */ - nc_hashval:31; /* hashval of stringname */ - char * nc_name; /* pointer to segment name in string cache */ + unsigned int nc_hashval; /* hashval of stringname */ + const char *nc_name; /* pointer to segment name in string cache */ }; @@ -190,18 +256,22 @@ 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 *trailing_slash, int *dp_authorized); + vfs_context_t context, int *dp_authorized, vnode_t last_dp); -void vnode_cache_credentials(vnode_t vp, vfs_context_t context); -void vnode_uncache_credentials(vnode_t vp); -int reverse_lookup(vnode_t start_vp, vnode_t *lookup_vpp, - struct filedesc *fdp, vfs_context_t context, int *dp_authorized); +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 */ @@ -209,7 +279,6 @@ int reverse_lookup(vnode_t start_vp, vnode_t *lookup_vpp, * Stats on usefulness of namei caches. */ struct nchstats { - long ncs_negtotal; 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 */