X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/378393581903b274cb7a4d18e0d978071a6b592d..cb3231590a3c94ab4375e2228bd5e86b0cf1ad7e:/bsd/sys/vnode_if.h diff --git a/bsd/sys/vnode_if.h b/bsd/sys/vnode_if.h index aa1201b5f..7959ff764 100644 --- a/bsd/sys/vnode_if.h +++ b/bsd/sys/vnode_if.h @@ -1,24 +1,29 @@ - /* - * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2016 Apple Computer, Inc. All rights reserved. + * + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ + * + * 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. * - * @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 + * 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. - * - * @APPLE_LICENSE_HEADER_END@ + * 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_OSREFERENCE_LICENSE_HEADER_END@ */ /* * Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved @@ -53,7 +58,12 @@ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ - +/* + * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce + * support for mandatory and extensible security protections. This notice + * is included in support of clause 2.2 (b) of the Apple Public License, + * Version 2.0. + */ /* * Warning: This file is generated automatically. @@ -81,33 +91,41 @@ extern struct vnodeop_desc vnop_default_desc; extern struct vnodeop_desc vnop_lookup_desc; +#ifdef KERNEL_PRIVATE +extern struct vnodeop_desc vnop_compound_open_desc; +extern struct vnodeop_desc vnop_compound_remove_desc; +extern struct vnodeop_desc vnop_compound_rename_desc; +extern struct vnodeop_desc vnop_compound_mkdir_desc; +extern struct vnodeop_desc vnop_compound_rmdir_desc; +#endif /* KERNEL_PRIVATE */ extern struct vnodeop_desc vnop_create_desc; -extern struct vnodeop_desc vnop_whiteout_desc; +extern struct vnodeop_desc vnop_whiteout_desc; // obsolete extern struct vnodeop_desc vnop_mknod_desc; extern struct vnodeop_desc vnop_open_desc; extern struct vnodeop_desc vnop_close_desc; extern struct vnodeop_desc vnop_access_desc; extern struct vnodeop_desc vnop_getattr_desc; extern struct vnodeop_desc vnop_setattr_desc; -extern struct vnodeop_desc vnop_getattrlist_desc; -extern struct vnodeop_desc vnop_setattrlist_desc; extern struct vnodeop_desc vnop_read_desc; extern struct vnodeop_desc vnop_write_desc; extern struct vnodeop_desc vnop_ioctl_desc; extern struct vnodeop_desc vnop_select_desc; extern struct vnodeop_desc vnop_exchange_desc; extern struct vnodeop_desc vnop_revoke_desc; +extern struct vnodeop_desc vnop_mmap_check_desc; extern struct vnodeop_desc vnop_mmap_desc; extern struct vnodeop_desc vnop_mnomap_desc; extern struct vnodeop_desc vnop_fsync_desc; extern struct vnodeop_desc vnop_remove_desc; extern struct vnodeop_desc vnop_link_desc; extern struct vnodeop_desc vnop_rename_desc; +extern struct vnodeop_desc vnop_renamex_desc; extern struct vnodeop_desc vnop_mkdir_desc; extern struct vnodeop_desc vnop_rmdir_desc; extern struct vnodeop_desc vnop_symlink_desc; extern struct vnodeop_desc vnop_readdir_desc; extern struct vnodeop_desc vnop_readdirattr_desc; +extern struct vnodeop_desc vnop_getattrlistbulk_desc; extern struct vnodeop_desc vnop_readlink_desc; extern struct vnodeop_desc vnop_inactive_desc; extern struct vnodeop_desc vnop_reclaim_desc; @@ -118,21 +136,53 @@ extern struct vnodeop_desc vnop_truncate_desc; extern struct vnodeop_desc vnop_allocate_desc; extern struct vnodeop_desc vnop_pagein_desc; extern struct vnodeop_desc vnop_pageout_desc; -extern struct vnodeop_desc vnop_devblocksize_desc; extern struct vnodeop_desc vnop_searchfs_desc; extern struct vnodeop_desc vnop_copyfile_desc; +extern struct vnodeop_desc vnop_clonefile_desc; extern struct vnodeop_desc vnop_blktooff_desc; extern struct vnodeop_desc vnop_offtoblk_desc; extern struct vnodeop_desc vnop_blockmap_desc; extern struct vnodeop_desc vnop_strategy_desc; extern struct vnodeop_desc vnop_bwrite_desc; -__BEGIN_DECLS +#ifdef __APPLE_API_UNSTABLE + +#if NAMEDSTREAMS +extern struct vnodeop_desc vnop_getnamedstream_desc; +extern struct vnodeop_desc vnop_makenamedstream_desc; +extern struct vnodeop_desc vnop_removenamedstream_desc; +#endif + +#endif + +#ifdef KERNEL_PRIVATE /* - *# - *#% lookup dvp L ? ? - *#% lookup vpp - L - + * This pair of functions register and unregister callout with + * buffer_cache_gc() code path. This callout enables underlying + * fs to kick off any memory reclamation that would be otherwise + * satisfied by buffer_cache_gc(). callout() will be called in the + * vm_pageout code path, so precautions should be taken to not + * allocate memory or take any locks which might have memory + * allocation behind them. callout() can be called with first parameter + * set to false, in which case memory reclamation should be + * limited in scope. In case of the first parameter set to true, fs + * MUST free some memory if possible. Second parameter to the + * register function will be passed as a second parameter to the + * callout() as is. + * fs_buffer_cache_gc_unregister() second parameter will be used + * to distinguish between same callout() and this parameter should + * match the one passed during registration. It will unregister all + * instances of the matching callout() and argument from the callout + * list. */ + + +extern int fs_buffer_cache_gc_register(void (* callout)(int, void *), void *); +extern int fs_buffer_cache_gc_unregister(void (* callout)(int, void *), void *); +#endif + +__BEGIN_DECLS + struct vnop_lookup_args { struct vnodeop_desc *a_desc; vnode_t a_dvp; @@ -140,16 +190,23 @@ struct vnop_lookup_args { struct componentname *a_cnp; vfs_context_t a_context; }; -extern errno_t VNOP_LOOKUP(vnode_t, vnode_t *, struct componentname *, vfs_context_t); - -/* - *# - *#% create dvp L L L - *#% create vpp - L - - *# +/*! + * @function VNOP_LOOKUP + * @abstract Call down to a filesystem to look for a directory entry by name. + * @discussion VNOP_LOOKUP is the key pathway through which VFS asks a filesystem to find a file. The vnode + * should be returned with an iocount to be dropped by the caller. A VNOP_LOOKUP() calldown can come without + * a preceding VNOP_OPEN(). + * @param dvp Directory in which to look up file. + * @param vpp Destination for found vnode. + * @param cnp Structure describing filename to find, reason for lookup, and various other data. + * @param ctx Context against which to authenticate lookup request. + * @return 0 for success or a filesystem-specific error. */ - +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_LOOKUP(vnode_t, vnode_t *, struct componentname *, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_create_args { struct vnodeop_desc *a_desc; vnode_t a_dvp; @@ -158,15 +215,24 @@ struct vnop_create_args { struct vnode_attr *a_vap; vfs_context_t a_context; }; -extern errno_t VNOP_CREATE(vnode_t, vnode_t *, struct componentname *, struct vnode_attr *, vfs_context_t); -/* - *# - *#% whiteout dvp L L L - *#% whiteout cnp - - - - *#% whiteout flag - - - - *# +/*! + * @function VNOP_CREATE + * @abstract Call down to a filesystem to create a regular file (VREG). + * @discussion If file creation succeeds, "vpp" should be returned with an iocount to be dropped by the caller. + * A VNOP_CREATE() calldown can come without a preceding VNOP_OPEN(). + * @param dvp Directory in which to create file. + * @param vpp Destination for vnode for newly created file. + * @param cnp Description of filename to create. + * @param vap File creation properties, as seen in vnode_getattr(). Manipulated with VATTR_ISACTIVE, VATTR_RETURN, + * VATTR_SET_SUPPORTED, and so forth. + * @param ctx Context against which to authenticate file creation. + * @return 0 for success or a filesystem-specific error. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_CREATE(vnode_t, vnode_t *, struct componentname *, struct vnode_attr *, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_whiteout_args { struct vnodeop_desc *a_desc; vnode_t a_dvp; @@ -174,127 +240,209 @@ struct vnop_whiteout_args { int a_flags; vfs_context_t a_context; }; -extern errno_t VNOP_WHITEOUT(vnode_t, struct componentname *, int, vfs_context_t); -/* - *# - *#% mknod dvp L U U - *#% mknod vpp - X - - *# +/*! + * @function VNOP_WHITEOUT + * @abstract Obsolete - no longer supported. + * @discussion Whiteouts are used to support the union filesystem, whereby one filesystem is mounted "transparently" + * on top of another. A whiteout in the upper layer of a union mount is a "deletion" of a file in the lower layer; + * lookups will catch the whiteout and fail, setting ISWHITEOUT in the componentname structure, even if an underlying + * file of the same name exists. The whiteout vnop is used for creation, deletion, and checking whether a directory + * supports whiteouts (see flags). + * also support the LOOKUP flag, which is used to test whether a directory supports whiteouts. + * @param dvp Directory in which to create. + * @param cnp Name information for whiteout. + * @param flags CREATE: create a whiteout. LOOKUP: check whether a directory supports whiteouts, DELETE: remove a whiteout. + * @param ctx Context against which to authenticate whiteout creation. + * @return 0 for success or a filesystem-specific error. Returning 0 for LOOKUP indicates that a directory does support whiteouts. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_WHITEOUT(vnode_t, struct componentname *, int, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_mknod_args { - struct vnodeop_desc *a_desc; - vnode_t a_dvp; - vnode_t *a_vpp; - struct componentname *a_cnp; - struct vnode_attr *a_vap; - vfs_context_t a_context; + struct vnodeop_desc *a_desc; + vnode_t a_dvp; + vnode_t *a_vpp; + struct componentname *a_cnp; + struct vnode_attr *a_vap; + vfs_context_t a_context; }; -extern errno_t VNOP_MKNOD(vnode_t, vnode_t *, struct componentname *, struct vnode_attr *, vfs_context_t); -/* - *# - *#% open vp L L L - *# +/*! + * @function VNOP_MKNOD + * @abstract Call down to a filesystem to create a special file. + * @discussion The mknod vnop is used to create character and block device files, named pipe (FIFO) files, and named sockets. + * The newly created file should be returned with an iocount which will be dropped by the caller. A VNOP_MKNOD() call + * can come down without a preceding VNOP_OPEN(). + * @param dvp Directory in which to create the special file. + * @param vpp Destination for newly created vnode. + * @param cnp Name information for new file. + * @param vap Attributes for new file, including type. + * @param ctx Context against which to authenticate node creation. + * @return 0 for success or a filesystem-specific error. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_MKNOD(vnode_t, vnode_t *, struct componentname *, struct vnode_attr *, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_open_args { struct vnodeop_desc *a_desc; vnode_t a_vp; int a_mode; vfs_context_t a_context; }; -extern errno_t VNOP_OPEN(vnode_t, int, vfs_context_t); -/* - *# - *#% close vp U U U - *# +#ifdef KERNEL_PRIVATE +struct vnop_compound_open_args { + struct vnodeop_desc *a_desc; + + vnode_t a_dvp; /* Directory in which to open/create */ + vnode_t *a_vpp; /* Resulting vnode */ + int a_fmode; /* Open mode */ + struct componentname *a_cnp; /* Path to look up */ + struct vnode_attr *a_vap; /* Attributes with which to create, if appropriate */ + uint32_t a_flags; /* VNOP-control flags */ + uint32_t *a_status; /* Information about results */ + + vfs_context_t a_context; /* Authorization context */ + + int (*a_open_create_authorizer)( /* Authorizer for create case */ + vnode_t dvp, /* Directory in which to create */ + struct componentname *cnp, /* As passed to VNOP */ + struct vnode_attr *vap, /* As passed to VNOP */ + vfs_context_t ctx, /* Context */ + void *reserved); /* Who knows */ + + int (*a_open_existing_authorizer)( /* Authorizer for preexisting case */ + vnode_t vp, /* vp to open */ + struct componentname *cnp, /* Lookup state */ + int fmode, /* As passed to VNOP */ + vfs_context_t ctx, /* Context */ + void *reserved); /* Who knows */ + + void *a_reserved; +}; + +/* Results */ +#define COMPOUND_OPEN_STATUS_DID_CREATE 0x00000001 +#endif /* KERNEL_PRIVATE */ + +/*! + * @function VNOP_OPEN + * @abstract Call down to a filesystem to open a file. + * @discussion The open vnop gives a filesystem a chance to initialize a file for + * operations like reading, writing, and ioctls. VFS promises to send down exactly one VNOP_CLOSE() + * for each VNOP_OPEN(). + * @param vp File to open. + * @param mode FREAD and/or FWRITE. + * @param ctx Context against which to authenticate open. + * @return 0 for success or a filesystem-specific error. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_OPEN(vnode_t, int, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + +#ifdef BSD_KERNEL_PRIVATE +struct nameidata; +extern int VNOP_COMPOUND_OPEN(vnode_t dvp, vnode_t *vpp, struct nameidata *ndp, int32_t flags, int32_t fmode, uint32_t *status, struct vnode_attr *vap, vfs_context_t ctx); +#endif + struct vnop_close_args { struct vnodeop_desc *a_desc; vnode_t a_vp; int a_fflag; vfs_context_t a_context; }; -extern errno_t VNOP_CLOSE(vnode_t, int, vfs_context_t); -/* - *# - *#% access vp L L L - *# +/*! + * @function VNOP_CLOSE + * @abstract Call down to a filesystem to close a file. + * @discussion The close vnop gives a filesystem a chance to release state set up + * by a VNOP_OPEN(). VFS promises to send down exactly one VNOP_CLOSE() for each VNOP_OPEN(). + * @param vp File to close. + * @param fflag FREAD and/or FWRITE; in the case of a file opened with open(2), fflag corresponds + * to how the file was opened. + * @param ctx Context against which to authenticate close. + * @return 0 for success or a filesystem-specific error. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_CLOSE(vnode_t, int, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_access_args { struct vnodeop_desc *a_desc; vnode_t a_vp; int a_action; vfs_context_t a_context; }; -extern errno_t VNOP_ACCESS(vnode_t, int, vfs_context_t); - -/* - *# - *#% getattr vp = = = - *# +/*! + * @function VNOP_ACCESS + * @abstract Call down to a filesystem to see if a kauth-style operation is permitted. + * @discussion VNOP_ACCESS is currently only called on filesystems which mark themselves + * as doing their authentication remotely (vfs_setauthopaque(), vfs_authopaque()). A VNOP_ACCESS() + * calldown may come without any preceding VNOP_OPEN(). + * @param vp File to authorize action for. + * @param action kauth-style action to be checked for permissions, e.g. KAUTH_VNODE_DELETE. + * @param ctx Context against which to authenticate action. + * @return 0 for success or a filesystem-specific error. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_ACCESS(vnode_t, int, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_getattr_args { struct vnodeop_desc *a_desc; vnode_t a_vp; struct vnode_attr *a_vap; vfs_context_t a_context; }; -extern errno_t VNOP_GETATTR(vnode_t, struct vnode_attr *, vfs_context_t); -/* - *# - *#% setattr vp L L L - *# +/*! + * @function VNOP_GETATTR + * @abstract Call down to a filesystem to get vnode attributes. + * @discussion Supported attributes ("Yes, I am returning this information") are set with VATTR_SET_SUPPORTED. + * Which attributes have been requested is checked with VATTR_IS_ACTIVE. Attributes + * are returned with VATTR_RETURN. It is through VNOP_GETATTR that routines like stat() get their information. + * A VNOP_GETATTR() calldown may come without any preceding VNOP_OPEN(). + * @param vp The vnode whose attributes to get. + * @param vap Container for which attributes are requested, which attributes are supported by the filesystem, and attribute values. + * @param ctx Context against which to authenticate request for attributes. + * @return 0 for success or a filesystem-specific error. VNOP_GETATTR() can return success even if not + * all requested attributes were returned; returning an error-value should indicate that something went wrong, rather than that + * some attribute is not supported. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_GETATTR(vnode_t, struct vnode_attr *, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_setattr_args { struct vnodeop_desc *a_desc; vnode_t a_vp; struct vnode_attr *a_vap; vfs_context_t a_context; }; -extern errno_t VNOP_SETATTR(vnode_t, struct vnode_attr *, vfs_context_t); - -/* - *# - *#% getattrlist vp = = = - *# - */ -struct vnop_getattrlist_args { - struct vnodeop_desc *a_desc; - vnode_t a_vp; - struct attrlist *a_alist; - struct uio *a_uio; - int a_options; - vfs_context_t a_context; -}; -extern errno_t VNOP_GETATTRLIST(vnode_t, struct attrlist *, struct uio *, int, vfs_context_t); - -/* - *# - *#% setattrlist vp L L L - *# +/*! + * @function VNOP_SETATTR + * @abstract Call down to a filesystem to set vnode attributes. + * @discussion Supported attributes ("Yes, I am setting this attribute.") are set with VATTR_SET_SUPPORTED. + * Requested attributes are checked with VATTR_IS_ACTIVE. Attribute values are accessed directly through + * structure fields. VNOP_SETATTR() is the core of the KPI function vnode_setattr(), which is used by chmod(), + * chown(), truncate(), and many others. A VNOP_SETATTR() call may come without any preceding VNOP_OPEN(). + * @param vp The vnode whose attributes to set. + * @param vap Container for which attributes are to be set and their desired values, as well as for the filesystem to + * return information about which attributes were successfully set. + * @param ctx Context against which to authenticate request for attribute change. + * @return 0 for success or a filesystem-specific error. VNOP_SETATTR() can return success even if not + * all requested attributes were set; returning an error-value should indicate that something went wrong, rather than that + * some attribute is not supported. */ -struct vnop_setattrlist_args { - struct vnodeop_desc *a_desc; - vnode_t a_vp; - struct attrlist *a_alist; - struct uio *a_uio; - int a_options; - vfs_context_t a_context; -}; -extern errno_t VNOP_SETATTRLIST(vnode_t, struct attrlist *, struct uio *, int, vfs_context_t); - +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_SETATTR(vnode_t, struct vnode_attr *, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ -/* - *# - *#% read vp L L L - *# - */ struct vnop_read_args { struct vnodeop_desc *a_desc; vnode_t a_vp; @@ -302,14 +450,23 @@ struct vnop_read_args { int a_ioflag; vfs_context_t a_context; }; -extern errno_t VNOP_READ(vnode_t, struct uio *, int, vfs_context_t); - -/* - *# - *#% write vp L L L - *# +/*! + * @function VNOP_READ + * @abstract Call down to a filesystem to read file data. + * @discussion VNOP_READ() is where the hard work of of the read() system call happens. The filesystem may use + * the buffer cache, the cluster layer, or an alternative method to get its data; uio routines will be used to see that data + * is copied to the correct virtual address in the correct address space and will update its uio argument + * to indicate how much data has been moved. + * @param vp The vnode to read from. + * @param uio Description of request, including file offset, amount of data requested, destination address for data, + * and whether that destination is in kernel or user space. + * @param ctx Context against which to authenticate read request. + * @return 0 for success or a filesystem-specific error. VNOP_READ() can return success even if less data was + * read than originally requested; returning an error value should indicate that something actually went wrong. */ +extern errno_t VNOP_READ(vnode_t vp, struct uio *uio, int, vfs_context_t ctx); + struct vnop_write_args { struct vnodeop_desc *a_desc; vnode_t a_vp; @@ -317,14 +474,23 @@ struct vnop_write_args { int a_ioflag; vfs_context_t a_context; }; -extern errno_t VNOP_WRITE(vnode_t, struct uio *, int, vfs_context_t); - -/* - *# - *#% ioctl vp U U U - *# +/*! + * @function VNOP_WRITE + * @abstract Call down to the filesystem to write file data. + * @discussion VNOP_WRITE() is to write() as VNOP_READ() is to read(). The filesystem may use + * the buffer cache, the cluster layer, or an alternative method to write its data; uio routines will be used to see that data + * is copied to the correct virtual address in the correct address space and will update its uio argument + * to indicate how much data has been moved. + * @param vp The vnode to write to. + * @param uio Description of request, including file offset, amount of data to write, source address for data, + * and whether that destination is in kernel or user space. + * @param ctx Context against which to authenticate write request. + * @return 0 for success or a filesystem-specific error. VNOP_WRITE() can return success even if less data was + * written than originally requested; returning an error value should indicate that something actually went wrong. */ +extern errno_t VNOP_WRITE(vnode_t vp, struct uio *uio, int ioflag, vfs_context_t ctx); + struct vnop_ioctl_args { struct vnodeop_desc *a_desc; vnode_t a_vp; @@ -333,14 +499,26 @@ struct vnop_ioctl_args { int a_fflag; vfs_context_t a_context; }; -extern errno_t VNOP_IOCTL(vnode_t, u_long, caddr_t, int, vfs_context_t); - -/* - *# - *#% select vp U U U - *# +/*! + * @function VNOP_IOCTL + * @abstract Call down to a filesystem or device driver to execute various control operations on or request data about a file. + * @discussion Ioctl controls are typically associated with devices, but they can in fact be passed + * down for any file; they are used to implement any of a wide range of controls and information requests. + * fcntl() calls VNOP_IOCTL for several commands, and will attempt a VNOP_IOCTL if it is passed an unknown command, + * though no copyin or copyout of arguments can occur in this case--the "arg" must be an integer value. + * Filesystems can define their own fcntls using this mechanism. How ioctl commands are structured + * is slightly complicated; see the manual page for ioctl(2). + * @param vp The vnode to execute the command on. + * @param command Identifier for action to take. + * @param data Pointer to data; this can be an integer constant (of 32 bits only) or an address to be read from or written to, + * depending on "command." If it is an address, it is valid and resides in the kernel; callers of VNOP_IOCTL() are + * responsible for copying to and from userland. + * @param ctx Context against which to authenticate ioctl request. + * @return 0 for success or a filesystem-specific error. */ +extern errno_t VNOP_IOCTL(vnode_t vp, u_long command, caddr_t data, int fflag, vfs_context_t ctx); + struct vnop_select_args { struct vnodeop_desc *a_desc; vnode_t a_vp; @@ -349,85 +527,153 @@ struct vnop_select_args { void *a_wql; vfs_context_t a_context; }; -extern errno_t VNOP_SELECT(vnode_t, int, int, void *, vfs_context_t); - -/* - *# - *#% exchange fvp L L L - *#% exchange tvp L L L - *# +/*! + * @function VNOP_SELECT + * @abstract Call down to a filesystem or device to check if a file is ready for I/O and request later notification if it is not currently ready. + * @discussion In general, regular are always "ready for I/O" and their select vnops simply return "1." + * Devices, though, may or may not be read; they keep track of who is selecting on them and send notifications + * when they become ready. xnu provides structures and routines for tracking threads waiting for I/O and waking up + * those threads: see selrecord(), selthreadclear(), seltrue(), selwait(), selwakeup(), and the selinfo structure (sys/select.h). + * @param vp The vnode to check for I/O readiness. + * @param which What kind of I/O is desired: FREAD, FWRITE. + * @param fflags Flags from fileglob as seen in fcntl.h, e.g. O_NONBLOCK, O_APPEND. + * @param wql Opaque object to pass to selrecord(). + * @param ctx Context to authenticate for select request. + * @return Nonzero indicates that a file is ready for I/O. 0 indicates that the file is not ready for I/O; + * there is no way to return an error. 0 should be returned if the device (or file) is not ready for I/O + * and the driver (or filesystem) is going to track the request and provide subsequent wakeups. + * the device (or filesystem) will provide a wakeup. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_SELECT(vnode_t, int, int, void *, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_exchange_args { struct vnodeop_desc *a_desc; vnode_t a_fvp; - vnode_t a_tvp; + vnode_t a_tvp; int a_options; vfs_context_t a_context; }; -extern errno_t VNOP_EXCHANGE(vnode_t, vnode_t, int, vfs_context_t); - -/* - *# - *#% revoke vp U U U - *# +/*! + * @function VNOP_EXCHANGE + * @abstract Call down to a filesystem to atomically exchange the data of two files. + * @discussion VNOP_EXCHANGE() is currently only called by the exchangedata() system call. It will only + * be applied to files on the same volume. + * @param fvp First vnode. + * @param tvp Second vnode. + * @param options Unused. + * @param ctx Context to authenticate for exchangedata request. + * @return 0 for success, else an error code. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_EXCHANGE(vnode_t, vnode_t, int, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_revoke_args { struct vnodeop_desc *a_desc; vnode_t a_vp; int a_flags; vfs_context_t a_context; }; + +/*! + * @function VNOP_REVOKE + * @abstract Call down to a filesystem to invalidate all open file descriptors for a vnode. + * @discussion This function is typically called as part of a TTY revoke, but can also be + * used on regular files. Most filesystems simply use nop_revoke(), which calls vn_revoke(), + * as their revoke vnop implementation. + * @param vp The vnode to revoke. + * @param flags Unused. + * @param ctx Context to authenticate for revoke request. + * @return 0 for success, else an error code. + */ +#ifdef XNU_KERNEL_PRIVATE extern errno_t VNOP_REVOKE(vnode_t, int, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ +struct vnop_mmap_check_args { + struct vnodeop_desc *a_desc; + vnode_t a_vp; + int a_flags; + vfs_context_t a_context; +}; -/* - *# - *# mmap - vp U U U - *# +/*! + * @function VNOP_MMAP_CHECK + * @abstract Check with a filesystem if a file can be mmap-ed. + * @discussion VNOP_MMAP_CHECK is used to check with the file system if a + * file can be mmap-ed. It will be called before any call to VNOP_MMAP(). + * @param vp The vnode being mmapped. + * @param flags Memory protection: PROT_READ, PROT_WRITE, PROT_EXEC. + * @param ctx Context to authenticate for mmap request. + * @return 0 for success; EPERM if the operation is not permitted; other + * errors (except ENOTSUP) may be returned at the discretion of the file + * system. ENOTSUP will never be returned by VNOP_MMAP_CHECK(). */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_MMAP_CHECK(vnode_t, int, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + + struct vnop_mmap_args { struct vnodeop_desc *a_desc; vnode_t a_vp; int a_fflags; vfs_context_t a_context; }; -extern errno_t VNOP_MMAP(vnode_t, int, vfs_context_t); -/* - *# - *# mnomap - vp U U U - *# +/*! + * @function VNOP_MMAP + * @abstract Notify a filesystem that a file is being mmap-ed. + * @discussion VNOP_MMAP is an advisory calldown to say that the system is mmap-ing a file. + * @param vp The vnode being mmapped. + * @param flags Memory protection: PROT_READ, PROT_WRITE, PROT_EXEC. + * @param ctx Context to authenticate for mmap request. + * @return 0 for success; all errors except EPERM are ignored. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_MMAP(vnode_t, int, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_mnomap_args { struct vnodeop_desc *a_desc; vnode_t a_vp; vfs_context_t a_context; }; -extern errno_t VNOP_MNOMAP(vnode_t, vfs_context_t); - -/* - *# - *#% fsync vp L L L - *# +/*! + * @function VNOP_MNOMAP + * @abstract Inform a filesystem that a file is no longer mapped. + * @discussion In general, no action is required of a filesystem for VNOP_MNOMAP. + * @param vp The vnode which is no longer mapped. + * @param ctx Context to authenticate for mnomap request. + * @return Return value is ignored. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_MNOMAP(vnode_t, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_fsync_args { struct vnodeop_desc *a_desc; vnode_t a_vp; int a_waitfor; vfs_context_t a_context; }; -extern errno_t VNOP_FSYNC(vnode_t, int, vfs_context_t); - -/* - *# - *#% remove dvp L U U - *#% remove vp L U U - *# +/*! + * @function VNOP_FSYNC + * @abstract Call down to a filesystem to synchronize a file with on-disk state. + * @discussion VNOP_FSYNC is called whenever we need to make sure that a file's data has been + * pushed to backing store, for example when recycling; it is also the heart of the fsync() system call. + * @param vp The vnode whose data to flush to backing store. + * @param ctx Context to authenticate for fsync request. + * @return 0 for success, else an error code. */ +extern errno_t VNOP_FSYNC(vnode_t vp, int waitfor, vfs_context_t ctx); + struct vnop_remove_args { struct vnodeop_desc *a_desc; vnode_t a_dvp; @@ -436,15 +682,44 @@ struct vnop_remove_args { int a_flags; vfs_context_t a_context; }; + +/*! + * @function VNOP_REMOVE + * @abstract Call down to a filesystem to delete a file. + * @discussion VNOP_REMOVE is called to remove a file from a filesystem's namespace, for example by unlink(). + * It can operate on regular files, named pipes, special files, and in some cases on directories. + * @param dvp Directory in which to delete a file. + * @param vp The file to delete. + * @param cnp Filename information. + * @param ctx Context to authenticate for fsync request. + * @return 0 for success, else an error code. + */ +#ifdef XNU_KERNEL_PRIVATE extern errno_t VNOP_REMOVE(vnode_t, vnode_t, struct componentname *, int, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ +#ifdef KERNEL_PRIVATE +struct vnop_compound_remove_args { + struct vnodeop_desc *a_desc; + vnode_t a_dvp; /* Directory in which to lookup and remove */ + vnode_t *a_vpp; /* File to remove; may or may not point to NULL pointer */ + struct componentname *a_cnp; /* Name of file to remove */ + struct vnode_attr *a_vap; /* Destination for file attributes on successful delete */ + uint32_t a_flags; /* Control flags (unused) */ + vfs_context_t a_context; /* Authorization context */ + int (*a_remove_authorizer)( /* Authorizer callback */ + vnode_t dvp, /* Directory in which to delete */ + vnode_t vp, /* File to delete */ + struct componentname *cnp, /* As passed to VNOP */ + vfs_context_t ctx, /* As passed to VNOP */ + void *reserved); /* Always NULL */ + void *a_reserved; /* Unused */ +}; +#endif /* KERNEL_PRIVATE */ -/* - *# - *#% link vp U U U - *#% link tdvp L U U - *# - */ +#ifdef BSD_KERNEL_PRIVATE +extern errno_t VNOP_COMPOUND_REMOVE(vnode_t, vnode_t*, struct nameidata *, int32_t flags, struct vnode_attr *vap, vfs_context_t); +#endif struct vnop_link_args { struct vnodeop_desc *a_desc; vnode_t a_vp; @@ -452,17 +727,21 @@ struct vnop_link_args { struct componentname *a_cnp; vfs_context_t a_context; }; -extern errno_t VNOP_LINK(vnode_t, vnode_t, struct componentname *, vfs_context_t); - -/* - *# - *#% rename fdvp U U U - *#% rename fvp U U U - *#% rename tdvp L U U - *#% rename tvp X U U - *# +/*! + * @function VNOP_LINK + * @abstract Call down to a filesystem to create a hardlink to a file. + * @discussion See "man 2 link". + * @param vp File to link to. + * @param dvp Directory in which to create the link. + * @param cnp Filename information for new link. + * @param ctx Context to authenticate for link request. + * @return 0 for success, else an error code. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_LINK(vnode_t, vnode_t, struct componentname *, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_rename_args { struct vnodeop_desc *a_desc; vnode_t a_fdvp; @@ -473,15 +752,110 @@ struct vnop_rename_args { struct componentname *a_tcnp; vfs_context_t a_context; }; + +/*! + * @function VNOP_RENAME + * @abstract Call down to a filesystem to rename a file. + * @discussion VNOP_RENAME() will only be called with a source and target on the same volume. + * @param fdvp Directory in which source file resides. + * @param fvp File being renamed. + * @param fcnp Name information for source file. + * @param tdvp Directory file is being moved to. + * @param tvp Existing file with same name as target, should one exist. + * @param tcnp Name information for target path. + * @param ctx Context to authenticate for rename request. + * @return 0 for success, else an error code. + */ +#ifdef XNU_KERNEL_PRIVATE extern errno_t VNOP_RENAME(vnode_t, vnode_t, struct componentname *, vnode_t, vnode_t, struct componentname *, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ +typedef unsigned int vfs_rename_flags_t; -/* - *# - *#% mkdir dvp L U U - *#% mkdir vpp - L - - *# +// Must match sys/stdio.h +enum { + VFS_RENAME_SECLUDE = 0x00000001, + VFS_RENAME_SWAP = 0x00000002, + VFS_RENAME_EXCL = 0x00000004, + + /* + * VFS_RENAME_DATALESS is kernel-only and is intentionally + * not included in VFS_RENAME_FLAGS_MASK. + */ + VFS_RENAME_DATALESS = 0x00000008, + + VFS_RENAME_FLAGS_MASK = (VFS_RENAME_SECLUDE | VFS_RENAME_SWAP + | VFS_RENAME_EXCL), +}; + +struct vnop_renamex_args { + struct vnodeop_desc *a_desc; + vnode_t a_fdvp; + vnode_t a_fvp; + struct componentname *a_fcnp; + vnode_t a_tdvp; + vnode_t a_tvp; + struct componentname *a_tcnp; + struct vnode_attr *a_vap; // Reserved for future use + vfs_rename_flags_t a_flags; + vfs_context_t a_context; +}; + +/*! + * @function VNOP_RENAMEX + * @abstract Call down to a filesystem to rename a file. + * @discussion VNOP_RENAMEX() will only be called with a source and target on the same volume. + * @param fdvp Directory in which source file resides. + * @param fvp File being renamed. + * @param fcnp Name information for source file. + * @param tdvp Directory file is being moved to. + * @param tvp Existing file with same name as target, should one exist. + * @param tcnp Name information for target path. + * @param flags Control certain rename semantics. + * @param ctx Context to authenticate for rename request. + * @return 0 for success, else an error code. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_RENAMEX(vnode_t, vnode_t, struct componentname *, vnode_t, vnode_t, struct componentname *, vfs_rename_flags_t, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + +#ifdef KERNEL_PRIVATE +struct vnop_compound_rename_args { + struct vnodeop_desc *a_desc; + + vnode_t a_fdvp; /* Directory from which to rename */ + vnode_t *a_fvpp; /* Vnode to rename (can point to a NULL pointer) */ + struct componentname *a_fcnp; /* Source name */ + struct vnode_attr *a_fvap; + + vnode_t a_tdvp; /* Directory to which to rename */ + vnode_t *a_tvpp; /* Vnode to rename over (can point to a NULL pointer) */ + struct componentname *a_tcnp; /* Destination name */ + struct vnode_attr *a_tvap; + + uint32_t a_flags; /* Control flags: currently unused */ + vfs_context_t a_context; /* Authorization context */ + int (*a_rename_authorizer)( /* Authorization callback */ + vnode_t fdvp, /* As passed to VNOP */ + vnode_t fvp, /* Vnode to rename */ + struct componentname *fcnp, /* As passed to VNOP */ + vnode_t tdvp, /* As passed to VNOP */ + vnode_t tvp, /* Vnode to rename over (can be NULL) */ + struct componentname *tcnp, /* As passed to VNOP */ + vfs_context_t ctx, /* As passed to VNOP */ + void *reserved); /* Always NULL */ + void *a_reserved; /* Currently unused */ +}; +#endif /* KERNEL_PRIVATE */ + +#ifdef XNU_KERNEL_PRIVATE +errno_t +VNOP_COMPOUND_RENAME( + struct vnode *fdvp, struct vnode **fvpp, struct componentname *fcnp, struct vnode_attr *fvap, + struct vnode *tdvp, struct vnode **tvpp, struct componentname *tcnp, struct vnode_attr *tvap, + uint32_t flags, vfs_context_t ctx); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_mkdir_args { struct vnodeop_desc *a_desc; vnode_t a_dvp; @@ -489,16 +863,44 @@ struct vnop_mkdir_args { struct componentname *a_cnp; struct vnode_attr *a_vap; vfs_context_t a_context; - }; +}; + +/*! + * @function VNOP_MKDIR + * @abstract Call down to a filesystem to create a directory. + * @discussion The newly created directory should be returned with an iocount which will be dropped by the caller. + * @param dvp Directory in which to create new directory. + * @param vpp Destination for pointer to new directory's vnode. + * @param cnp Name information for new directory. + * @param vap Attributes for new directory. + * @param ctx Context to authenticate for mkdir request. + * @return 0 for success, else an error code. + */ +#ifdef XNU_KERNEL_PRIVATE extern errno_t VNOP_MKDIR(vnode_t, vnode_t *, struct componentname *, struct vnode_attr *, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ -/* - *# - *#% rmdir dvp L U U - *#% rmdir vp L U U - *# - */ +#ifdef KERNEL_PRIVATE +struct vnop_compound_mkdir_args { + struct vnodeop_desc *a_desc; + vnode_t a_dvp; /* Directory in which to create */ + vnode_t *a_vpp; /* Destination for found or created vnode */ + struct componentname *a_cnp; /* Name of directory to create */ + struct vnode_attr *a_vap; /* Creation attributes */ + uint32_t a_flags; /* Control flags (unused) */ + vfs_context_t a_context; /* Authorization context */ +#if 0 + int (*a_mkdir_authorizer)(vnode_t dvp, struct componentname *cnp, struct vnode_attr *vap, vfs_context_t ctx, void *reserved); +#endif /* 0 */ + void *a_reserved; /* Unused */ +}; +#endif /* KERNEL_PRIVATE */ + +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_COMPOUND_MKDIR(vnode_t, vnode_t *, struct nameidata *, struct vnode_attr *, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_rmdir_args { struct vnodeop_desc *a_desc; vnode_t a_dvp; @@ -506,31 +908,73 @@ struct vnop_rmdir_args { struct componentname *a_cnp; vfs_context_t a_context; }; + +/*! + * @function VNOP_RMDIR + * @abstract Call down to a filesystem to delete a directory. + * @param dvp Parent of directory to be removed. + * @param vp Directory to remove. + * @param cnp Name information for directory to be deleted. + * @param ctx Context to authenticate for rmdir request. + * @return 0 for success, else an error code. + */ +#ifdef XNU_KERNEL_PRIVATE extern errno_t VNOP_RMDIR(vnode_t, vnode_t, struct componentname *, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + +#ifdef KERNEL_PRIVATE +struct vnop_compound_rmdir_args { + struct vnodeop_desc *a_desc; + vnode_t a_dvp; /* Directory in which to look up and delete */ + vnode_t *a_vpp; /* Destination for found vnode */ + struct componentname *a_cnp; /* Name to delete */ + struct vnode_attr *a_vap; /* Location in which to store attributes if delete succeeds (can be NULL) */ + uint32_t a_flags; /* Control flags (currently unused) */ + vfs_context_t a_context; /* Context for authorization */ + int (*a_rmdir_authorizer)( /* Authorization callback */ + vnode_t dvp, /* As passed to VNOP */ + vnode_t vp, /* Directory to delete */ + struct componentname *cnp, /* As passed to VNOP */ + vfs_context_t ctx, /* As passed to VNOP */ + void *reserved); /* Always NULL */ + void *a_reserved; /* Unused */ +}; +#endif /* KERNEL_PRIVATE */ + +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_COMPOUND_RMDIR(vnode_t, vnode_t*, struct nameidata *, struct vnode_attr *vap, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ -/* - *# - *#% symlink dvp L U U - *#% symlink vpp - U - - *# - */ struct vnop_symlink_args { - struct vnodeop_desc *a_desc; - vnode_t a_dvp; - vnode_t *a_vpp; - struct componentname *a_cnp; - struct vnode_attr *a_vap; - char *a_target; - vfs_context_t a_context; + struct vnodeop_desc *a_desc; + vnode_t a_dvp; + vnode_t *a_vpp; + struct componentname *a_cnp; + struct vnode_attr *a_vap; + char *a_target; + vfs_context_t a_context; }; -extern errno_t VNOP_SYMLINK(vnode_t, vnode_t *, struct componentname *, struct vnode_attr *, char *, vfs_context_t); +/*! + * @function VNOP_SYMLINK + * @abstract Call down to a filesystem to create a symbolic link. + * @param If VNOP_SYMLINK() is successful, the new file should be returned with an iocount which will + * be dropped by the caller. VFS does not ensure that the target path will have a length shorter + * than the max symlink length for the filesystem. + * @param dvp Parent directory for new symlink file. + * @param vpp + * @param cnp Name information for new symlink. + * @param vap Attributes for symlink. + * @param target Path for symlink to store; for "ln -s /var/vardir linktovardir", "target" would be "/var/vardir" + * @param ctx Context to authenticate for symlink request. + * @return 0 for success, else an error code. + */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_SYMLINK(vnode_t, vnode_t *, struct componentname *, struct vnode_attr *, char *, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ /* - *# - *#% readdir vp L L L - *# * * When VNOP_READDIR is called from the NFS Server, the nfs_data * argument is non-NULL. @@ -558,89 +1002,178 @@ struct vnop_readdir_args { int *a_numdirent; vfs_context_t a_context; }; -extern errno_t VNOP_READDIR(vnode_t, struct uio *, int, int *, int *, vfs_context_t); - -/* - *# - *#% readdirattr vp L L L - *# +/*! + * @function VNOP_READDIR + * @abstract Call down to a filesystem to enumerate directory entries. + * @discussion VNOP_READDIR() packs a buffer with "struct dirent" directory entry representations as described + * by the "getdirentries" manual page. + * @param vp Directory to enumerate. + * @param uio Destination information for resulting direntries. + * @param flags VNODE_READDIR_EXTENDED, VNODE_READDIR_REQSEEKOFF, VNODE_READDIR_SEEKOFF32: Apple-internal flags. + * @param eofflag Should be set to 1 if the end of the directory has been reached. + * @param numdirent Should be set to number of entries written into buffer. + * @param ctx Context to authenticate for readdir request. + * @return 0 for success, else an error code. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_READDIR(vnode_t, struct uio *, int, int *, int *, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_readdirattr_args { struct vnodeop_desc *a_desc; vnode_t a_vp; struct attrlist *a_alist; struct uio *a_uio; - u_long a_maxcount; - u_long a_options; - u_long *a_newstate; + uint32_t a_maxcount; + uint32_t a_options; + uint32_t *a_newstate; int *a_eofflag; - u_long *a_actualcount; + uint32_t *a_actualcount; vfs_context_t a_context; }; -extern errno_t VNOP_READDIRATTR(vnode_t, struct attrlist *, struct uio *, u_long, u_long, u_long *, int *, u_long *, vfs_context_t); +/*! + * @function VNOP_READDIRATTR + * @abstract Call down to get file attributes for many files in a directory at once. + * @discussion VNOP_READDIRATTR() packs a buffer with file attributes, as if the results of many "getattrlist" calls. + * @param vp Directory in which to enumerate entries' attributes. + * @param alist Which attributes are wanted for each directory entry. + * @param uio Destination information for resulting attributes. + * @param maxcount Maximum count of files to get attributes for. + * @param options FSOPT_NOFOLLOW: do not follow symbolic links. FSOPT_NOINMEMUPDATE: do not use data which have been + * updated since an inode was loaded into memory. + * @param newstate The "newstate" should be set to a value which changes if the contents of a directory change + * through an addition or deletion but stays the same otherwise. + * @param eofflag Should be set to 1 if the end of the directory has been reached. + * @param actualcount Should be set to number of files whose attributes were written into buffer. + * @param ctx Context to authenticate for readdirattr request. + * @return 0 for success, else an error code. + */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_READDIRATTR(vnode_t, struct attrlist *, struct uio *, uint32_t, uint32_t, uint32_t *, int *, uint32_t *, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ -/* - *# - *#% readlink vp L L L - *# +struct vnop_getattrlistbulk_args { + struct vnodeop_desc *a_desc; + vnode_t a_vp; + struct attrlist *a_alist; + struct vnode_attr *a_vap; + struct uio *a_uio; + void *a_private; + uint64_t a_options; + int32_t *a_eofflag; + int32_t *a_actualcount; + vfs_context_t a_context; +}; + +/*! + * @function VNOP_GETATTRLISTBULK + * @abstract Call down to get file attributes for many files in a directory at once. + * @discussion VNOP_GETATTRLISTBULK() packs a buffer with file attributes, as if the results of many "getattrlist" calls. + * @param vp Directory in which to enumerate entries' attributes. + * @param alist Which attributes are wanted for each directory entry. + * @param uio Destination information for resulting attributes. + * @param vap initialised vnode_attr structure pointer. This structure also has memory allocated (MAXPATHLEN bytes) and assigned to the va_name field for filesystems to use. + * @param private reserved for future use. + * @param options + * @param eofflag Should be set to 1 if the end of the directory has been reached. + * @param actualcount Should be set to number of files whose attributes were written into buffer. + * @param ctx Context to authenticate for getattrlistbulk request. + * @return 0 for success, else an error code. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_GETATTRLISTBULK(vnode_t, struct attrlist *, struct vnode_attr *, uio_t, void *, uint64_t, int32_t *, int32_t *, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_readlink_args { struct vnodeop_desc *a_desc; vnode_t a_vp; struct uio *a_uio; vfs_context_t a_context; }; -extern errno_t VNOP_READLINK(vnode_t, struct uio *, vfs_context_t); - -/* - *# - *#% inactive vp L U U - *# +/*! + * @function VNOP_READLINK + * @abstract Call down to a filesystem to get the pathname represented by a symbolic link. + * @discussion VNOP_READLINK() gets the path stored in a symbolic link; it is called by namei() and the readlink() system call. + * @param vp Symbolic link to read from. + * @param uio Destination information for link path. + * @param ctx Context to authenticate for readlink request. + * @return 0 for success, else an error code. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_READLINK(vnode_t, struct uio *, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_inactive_args { struct vnodeop_desc *a_desc; vnode_t a_vp; vfs_context_t a_context; }; -extern errno_t VNOP_INACTIVE(vnode_t, vfs_context_t); - -/* - *# - *#% reclaim vp U U U - *# +/*! + * @function VNOP_INACTIVE + * @abstract Notify a filesystem that the last usecount (persistent reference) on a vnode has been dropped. + * @discussion VNOP_INACTVE() gives a filesystem a chance to aggressively release resources assocated with a vnode, perhaps + * even to call vnode_recycle(), but no action is prescribed; it is acceptable for VNOP_INACTIVE to be a no-op and + * to defer all reclamation until VNOP_RECLAIM(). + * VNOP_INACTVE() will not be called on a vnode if no persistent reference is ever taken; an + * important example is a stat(), which takes an iocount, reads its data, and drops that iocount. + * @param vp The vnode which is now inactive. + * @param ctx Context to authenticate for inactive message. + * @return 0 for success, else an error code, but return value is currently ignored. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_INACTIVE(vnode_t, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_reclaim_args { struct vnodeop_desc *a_desc; vnode_t a_vp; vfs_context_t a_context; }; -extern errno_t VNOP_RECLAIM(vnode_t, vfs_context_t); - -/* - *# - *#% pathconf vp L L L - *# +/*! + * @function VNOP_RECLAIM + * @abstract Release filesystem-internal resources for a vnode. + * @discussion VNOP_RECLAIM() is called as part of the process of recycling a vnode. During + * a reclaim routine, a filesystem should remove a vnode from its hash and deallocate any resources + * allocated to that vnode. VFS guarantees that when VNOP_RECLAIM() is called, there are no more + * iocount references on a vnode (though there may still be usecount references--these are invalidated + * by the reclaim) and that no more will be granted. This means in practice that there will be no + * filesystem calls on the vnode being reclaimed until the reclaim has finished and the vnode has + * been reused. + * @param vp The vnode to reclaim. + * @param ctx Context to authenticate for reclaim. + * @return 0 for success, or an error code. A nonzero return value results in a panic. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_RECLAIM(vnode_t, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_pathconf_args { struct vnodeop_desc *a_desc; vnode_t a_vp; int a_name; - register_t *a_retval; + int32_t *a_retval; vfs_context_t a_context; }; -extern errno_t VNOP_PATHCONF(vnode_t, int, register_t *, vfs_context_t); /* register_t??????? */ - -/* - *# - *#% advlock vp U U U - *# +/*! + * @function VNOP_PATHCONF + * @abstract Query a filesystem for path properties. + * @param vp The vnode whose filesystem to query. + * @param name Which property to request: see unistd.h. For example: _PC_CASE_SENSITIVE (is + * a filesystem case-sensitive?). Only one property can be requested at a time. + * @param retval Destination for value of property. + * @param ctx Context to authenticate for pathconf request. + * @return 0 for success, or an error code. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_PATHCONF(vnode_t, int, int32_t *, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_advlock_args { struct vnodeop_desc *a_desc; vnode_t a_vp; @@ -649,14 +1182,32 @@ struct vnop_advlock_args { struct flock *a_fl; int a_flags; vfs_context_t a_context; + struct timespec *a_timeout; }; -extern errno_t VNOP_ADVLOCK(vnode_t, caddr_t, int, struct flock *, int, vfs_context_t); -/* - *# - *#% allocate vp L L L - *# +/*! + * @function VNOP_ADVLOCK + * @abstract Aquire or release and advisory lock on a vnode. + * @discussion Advisory locking is somewhat complicated. VNOP_ADVLOCK is overloaded for + * both flock() and POSIX advisory locking usage, though not all filesystems support both (or any). VFS + * provides an advisory locking mechanism for filesystems which can take advantage of it; vfs_setlocklocal() + * marks a filesystem as using VFS advisory locking support. + * @param vp The vnode to lock or unlock. + * @param id Identifier for lock holder: ignored by most filesystems. + * @param op Which locking operation: F_SETLK: set locking information about a region. + * F_GETLK: get locking information about the specified region. F_UNLCK: Unlock a region. + * @param fl Description of file region to lock. l_whence is as with "lseek." + * Includes a type: F_RDLCK (shared lock), F_UNLCK (unlock) , and F_WRLCK (exclusive lock). + * @param flags F_FLOCK: use flock() semantics. F_POSIX: use POSIX semantics. F_WAIT: sleep if necessary. + * F_PROV: Non-coelesced provisional lock (unused in xnu). + * @param ctx Context to authenticate for advisory locking request. + * @param timeout Timespec for timeout in case of F_SETLKWTIMEOUT. + * @return 0 for success, or an error code. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_ADVLOCK(vnode_t, caddr_t, int, struct flock *, int, vfs_context_t, struct timespec *); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_allocate_args { struct vnodeop_desc *a_desc; vnode_t a_vp; @@ -666,87 +1217,157 @@ struct vnop_allocate_args { off_t a_offset; vfs_context_t a_context; }; -extern errno_t VNOP_ALLOCATE(vnode_t, off_t, u_int32_t, off_t *, off_t, vfs_context_t); -/* - *# - *#% pagein vp = = = - *# +/*! + * @function VNOP_ALLOCATE + * @abstract Pre-allocate space for a file. + * @discussion VNOP_ALLOCATE() changes the amount of backing store set aside to + * a file. It can be used to either shrink or grow a file. If the file shrinks, + * its ubc size will be modified accordingly, but if it grows, then the ubc size is unchanged; + * space is set aside without being actively used by the file. VNOP_ALLOCATE() is currently only + * called as part of the F_PREALLOCATE fcntl. + * @param vp The vnode for which to preallocate space. + * @param length Desired preallocated file length. + * @param flags + * PREALLOCATE: preallocate allocation blocks. + * ALLOCATECONTIG: allocate contigious space. + * ALLOCATEALL: allocate all requested space or no space at all. + * FREEREMAINDER: deallocate allocated but unfilled blocks. + * ALLOCATEFROMPEOF: allocate from the physical eof. + * ALLOCATEFROMVOL: allocate from the volume offset. + * @param bytesallocated Additional bytes set aside for file. Set to 0 if none are allocated + * OR if the file is contracted. + * @param offset Hint for where to find free blocks. + * @param ctx Context to authenticate for allocation request. + * @return 0 for success, or an error code. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_ALLOCATE(vnode_t, off_t, u_int32_t, off_t *, off_t, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_pagein_args { struct vnodeop_desc *a_desc; vnode_t a_vp; upl_t a_pl; - vm_offset_t a_pl_offset; + upl_offset_t a_pl_offset; off_t a_f_offset; size_t a_size; int a_flags; vfs_context_t a_context; }; -extern errno_t VNOP_PAGEIN(vnode_t, upl_t, vm_offset_t, off_t, size_t, int, vfs_context_t); /* vm_offset_t ? */ - -/* - *# - *#% pageout vp = = = - *# +/*! + * @function VNOP_PAGEIN + * @abstract Pull file data into memory. + * @discussion VNOP_PAGEIN() is called by when a process faults on data mapped from a file or + * when madvise() demands pre-fetching. It is conceptually somewhat similar to VNOP_READ(). Filesystems + * are typically expected to call cluster_pagein() to handle the labor of mapping and committing the UPL. + * @param vp The vnode for which to page in data. + * @param pl UPL describing pages needing to be paged in. + * @param pl_offset Offset in UPL at which to start placing data. + * @param f_offset Offset in file of data needing to be paged in. + * @param size Amount of data to page in (in bytes). + * @param flags UPL-style flags: UPL_IOSYNC, UPL_NOCOMMIT, UPL_NORDAHEAD, UPL_VNODE_PAGER, UPL_MSYNC. + * Filesystems should generally leave it to the cluster layer to handle these flags. See the + * memory_object_types.h header in the kernel framework if interested. + * @param ctx Context to authenticate for pagein request. + * @return 0 for success, or an error code. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_PAGEIN(vnode_t, upl_t, upl_offset_t, off_t, size_t, int, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_pageout_args { struct vnodeop_desc *a_desc; vnode_t a_vp; upl_t a_pl; - vm_offset_t a_pl_offset; + upl_offset_t a_pl_offset; off_t a_f_offset; size_t a_size; int a_flags; vfs_context_t a_context; }; -extern errno_t VNOP_PAGEOUT(vnode_t, upl_t, vm_offset_t, off_t, size_t, int, vfs_context_t); - -#ifdef BSD_KERNEL_PRIVATE -/* - *#% devblocksize vp = = = - *# +/*! + * @function VNOP_PAGEOUT + * @abstract Write data from a mapped file back to disk. + * @discussion VNOP_PAGEOUT() is called when data from a mapped file needs to be flushed to disk, either + * because of an msync() call or due to memory pressure. Filesystems are for the most part expected to + * just call cluster_pageout(). However, if they opt into the VFC_VFSVNOP_PAGEOUTV2 flag, then + * they will be responsible for creating their own UPLs. + * @param vp The vnode for which to page out data. + * @param pl UPL describing pages needed to be paged out. If UPL is NULL, then it means the filesystem + * has opted into VFC_VFSVNOP_PAGEOUTV2 semantics, which means that it will create and operate on its own UPLs + * as opposed to relying on the one passed down into the filesystem. This means that the filesystem must be + * responsible for N cluster_pageout calls for N dirty ranges in the UPL. + * @param pl_offset Offset in UPL from which to start paging out data. Under the new VFC_VFSVNOP_PAGEOUTV2 + * semantics, this is the offset in the range specified that must be paged out if the associated page is dirty. + * @param f_offset Offset in file of data needing to be paged out. Under the new VFC_VFSVNOP_PAGEOUTV2 + * semantics, this represents the offset in the file where we should start looking for dirty pages. + * @param size Amount of data to page out (in bytes). Under VFC_VFSVNOP_PAGEOUTV2, this represents + * the size of the range to be considered. The fileystem is free to extend or shrink the specified range + * to better fit its blocking model as long as the page at 'pl_offset' is included. + * @param flags UPL-style flags: UPL_IOSYNC, UPL_NOCOMMIT, UPL_NORDAHEAD, UPL_VNODE_PAGER, UPL_MSYNC. + * Filesystems should generally leave it to the cluster layer to handle these flags. See the + * memory_object_types.h header in the kernel framework if interested. + * @param ctx Context to authenticate for pageout request. + * @return 0 for success, or an error code. */ -struct vnop_devblocksize_args { - struct vnodeop_desc *a_desc; - vnode_t a_vp; - register_t *a_retval; -}; -#endif /* BSD_KERNEL_PRIVATE */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_PAGEOUT(vnode_t, upl_t, upl_offset_t, off_t, size_t, int, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ -/* - *# - *#% searchfs vp L L L - *# - */ struct vnop_searchfs_args { struct vnodeop_desc *a_desc; vnode_t a_vp; void *a_searchparams1; void *a_searchparams2; struct attrlist *a_searchattrs; - u_long a_maxmatches; + uint32_t a_maxmatches; struct timeval *a_timelimit; struct attrlist *a_returnattrs; - u_long *a_nummatches; - u_long a_scriptcode; - u_long a_options; + uint32_t *a_nummatches; + uint32_t a_scriptcode; + uint32_t a_options; struct uio *a_uio; struct searchstate *a_searchstate; vfs_context_t a_context; }; -extern errno_t VNOP_SEARCHFS(vnode_t, void *, void *, struct attrlist *, u_long, struct timeval *, struct attrlist *, u_long *, u_long, u_long, struct uio *, struct searchstate *, vfs_context_t); - /* - *# - *#% copyfile fvp U U U - *#% copyfile tdvp L U U - *#% copyfile tvp X U U - *# + * @function VNOP_SEARCHFS + * @abstract Search a filesystem quickly for files or directories that match the passed-in search criteria. + * @discussion VNOP_SEARCHFS is a getattrlist-based system call which is implemented almost entirely inside + * supported filesystems. Callers provide a set of criteria to match against, and the filesystem is responsible + * for finding all files or directories that match the criteria. Once these files or directories are found, + * the user-requested attributes of these files is provided as output. The set of searchable attributes is a + * subset of the getattrlist attributes. For example, ATTR_CMN_UUID is not a valid searchable attribute as of + * 10.6. A common usage scenario could be to request all files whose mod dates is greater than time X, less than + * time Y, and provide the inode ID and filename of the matching objects as output. + * @param vp The vnode representing the mountpoint of the filesystem to be searched. + * @param a_searchparams1 If one-argument search criteria is requested, the search criteria would go here. However, + * some search criteria, like ATTR_CMN_MODTIME, can be bounded. The user could request files modified between time X + * and time Y. In this case, the lower bound goes in a_searchparams1. + * @param a_searchparams2 If two-argument search criteria is requested, the upper bound goes in here. + * @param a_searchattrs Contains the getattrlist-style attribute bits which are requested by the current search. + * @param a_maxmatches The maximum number of matches to return in a single system call. + * @param a_timelimit The suggested maximum amount of time we can spend in the kernel to service this system call. + * Filesystems should use this as a guide only, and set their own internal maximum time to avoid denial of service. + * @param a_returnattrs The getattrlist-style attributes to return for items in the filesystem that match the search + * criteria above. + * @param a_scriptcode Currently ignored. + * @param a_uio The uio in which to write out the search matches. + * @param a_searchstate Sometimes searches cannot be completed in a single system call. In this case, we provide + * an identifier back to the user which indicates where to resume a previously-started search. This is an opaque structure + * used by the filesystem to identify where to resume said search. + * @param a_context The context in which to perform the filesystem search. + * @return 0 on success, EAGAIN for searches which could not be completed in 1 call, and other ERRNOS as needed. */ + +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_SEARCHFS(vnode_t, void *, void *, struct attrlist *, uint32_t, struct timeval *, struct attrlist *, uint32_t *, uint32_t, uint32_t, struct uio *, struct searchstate *, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_copyfile_args { struct vnodeop_desc *a_desc; vnode_t a_fvp; @@ -757,41 +1378,125 @@ struct vnop_copyfile_args { int a_flags; vfs_context_t a_context; }; + +#ifdef XNU_KERNEL_PRIVATE extern errno_t VNOP_COPYFILE(vnode_t, vnode_t, vnode_t, struct componentname *, int, int, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ +typedef enum dir_clone_authorizer_op { + OP_AUTHORIZE = 0, /* request authorization of action */ + OP_VATTR_SETUP = 1, /* query for attributes that are required for OP_AUTHORIZE */ + OP_VATTR_CLEANUP = 2 /* request to cleanup any state or free any memory allocated in OP_AUTHORIZE */ +} dir_clone_authorizer_op_t; + +struct vnop_clonefile_args { + struct vnodeop_desc *a_desc; + vnode_t a_fvp; + vnode_t a_dvp; + vnode_t *a_vpp; + struct componentname *a_cnp; + struct vnode_attr *a_vap; + uint32_t a_flags; + vfs_context_t a_context; + int (*a_dir_clone_authorizer)( /* Authorization callback */ + struct vnode_attr *vap, /* attribute to be authorized */ + kauth_action_t action, /* action for which attribute is to be authorized */ + struct vnode_attr *dvap, /* target directory attributes */ + vnode_t sdvp, /* source directory vnode pointer (optional) */ + mount_t mp, /* mount point of filesystem */ + dir_clone_authorizer_op_t vattr_op, /* specific operation requested : setup, authorization or cleanup */ + uint32_t flags, /* needs to have the value passed to a_flags */ + vfs_context_t ctx, /* As passed to VNOP */ + void *reserved); /* Always NULL */ + void *a_reserved; /* Currently unused */ +}; + +/*! + * @function VNOP_CLONEFILE + * @abstract Call down to a filesystem to clone a filesystem object (regular file, directory or symbolic link.) + * @discussion If file creation succeeds, "vpp" should be returned with an iocount to be dropped by the caller. + * @param dvp Directory in which to clone object. + * @param vpp Destination for vnode for newly cloned object. + * @param cnp Description of name of object to clone. + * @param vap File creation properties, as seen in vnode_getattr(). Manipulated with VATTR_ISACTIVE, VATTR_RETURN, + * VATTR_SET_SUPPORTED, and so forth. All attributes not set here should either be copied + * from the source object + * or set to values which are used for creating new filesystem objects + * @param ctx Context against which to authenticate file creation. + * @return 0 for success or a filesystem-specific error. + */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_CLONEFILE(vnode_t, vnode_t, vnode_t *, struct componentname *, struct vnode_attr *, uint32_t, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ struct vnop_getxattr_args { struct vnodeop_desc *a_desc; vnode_t a_vp; - char * a_name; + const char * a_name; uio_t a_uio; size_t *a_size; int a_options; vfs_context_t a_context; }; extern struct vnodeop_desc vnop_getxattr_desc; -extern errno_t VNOP_GETXATTR(vnode_t, const char *, uio_t, size_t *, int, vfs_context_t); + +/*! + * @function VNOP_GETXATTR + * @abstract Get extended file attributes. + * @param vp The vnode to get extended attributes for. + * @param name Which property to extract. + * @param uio Destination information for attribute value. + * @param size Should be set to the amount of data written. + * @param options XATTR_NOSECURITY: bypass security-checking. + * @param ctx Context to authenticate for getxattr request. + * @return 0 for success, or an error code. + */ +extern errno_t VNOP_GETXATTR(vnode_t vp, const char *name, uio_t uio, size_t *size, int options, vfs_context_t ctx); struct vnop_setxattr_args { struct vnodeop_desc *a_desc; vnode_t a_vp; - char * a_name; + const char * a_name; uio_t a_uio; int a_options; vfs_context_t a_context; }; extern struct vnodeop_desc vnop_setxattr_desc; -extern errno_t VNOP_SETXATTR(vnode_t, const char *, uio_t, int, vfs_context_t); + +/*! + * @function VNOP_SETXATTR + * @abstract Set extended file attributes. + * @param vp The vnode to set extended attributes for. + * @param name Which property to extract. + * @param uio Source information for attribute value. + * @param options XATTR_NOSECURITY: bypass security-checking. XATTR_CREATE: set value, fail if exists. + * XATTR_REPLACE: set value, fail if does not exist. + * @param ctx Context to authenticate for setxattr request. + * @return 0 for success, or an error code. + */ +extern errno_t VNOP_SETXATTR(vnode_t vp, const char *name, uio_t uio, int options, vfs_context_t ctx); struct vnop_removexattr_args { struct vnodeop_desc *a_desc; vnode_t a_vp; - char * a_name; + const char * a_name; int a_options; vfs_context_t a_context; }; extern struct vnodeop_desc vnop_removexattr_desc; + +/*! + * @function VNOP_REMOVEXATTR + * @abstract Remove extended file attributes. + * @param vp The vnode from which to remove extended attributes. + * @param name Which attribute to delete. + * @param options XATTR_NOSECURITY: bypass security-checking. + * @param ctx Context to authenticate for attribute delete request. + * @return 0 for success, or an error code. + */ +#ifdef XNU_KERNEL_PRIVATE extern errno_t VNOP_REMOVEXATTR(vnode_t, const char *, int, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ struct vnop_listxattr_args { struct vnodeop_desc *a_desc; @@ -802,42 +1507,63 @@ struct vnop_listxattr_args { vfs_context_t a_context; }; extern struct vnodeop_desc vnop_listxattr_desc; -extern errno_t VNOP_LISTXATTR(vnode_t, uio_t, size_t *, int, vfs_context_t); - -/* - *# - *#% blktooff vp = = = - *# +/*! + * @function VNOP_LISTXATTR + * @abstract List extended attribute keys. + * @discussion Should write a sequence of unseparated, null-terminated extended-attribute + * names into the space described by the provided uio. These keys can then be passed to + * getxattr() (and VNOP_GETXATTR()). + * @param vp The vnode for which to get extended attribute keys. + * @param uio Description of target memory for attribute keys. + * @param size Should be set to amount of data written to buffer. + * @param options XATTR_NOSECURITY: bypass security checking. + * @param ctx Context to authenticate for attribute name request. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_LISTXATTR(vnode_t, uio_t, size_t *, int, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_blktooff_args { struct vnodeop_desc *a_desc; vnode_t a_vp; daddr64_t a_lblkno; off_t *a_offset; }; -extern errno_t VNOP_BLKTOOFF(vnode_t, daddr64_t, off_t *); - -/* - *# - *#% offtoblk vp = = = - *# +/*! + * @function VNOP_BLKTOOFF + * @abstract Call down to a filesystem to convert a logical block number to a file offset. + * @discussion VNOP_BLKTOOFF() converts a logical block to a file offset in bytes. That offset + * can be passed to VNOP_BLOCKMAP(), then, to get a physical block number--buf_strategy() does this. + * @param vp The vnode for which to convert a logical block to an offset. + * @param lblkno Logical block number to turn into offset. + * @param offset Destination for file offset. + * @return 0 for success, else an error code. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_BLKTOOFF(vnode_t, daddr64_t, off_t *); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_offtoblk_args { struct vnodeop_desc *a_desc; vnode_t a_vp; off_t a_offset; daddr64_t *a_lblkno; }; -extern errno_t VNOP_OFFTOBLK(vnode_t, off_t, daddr64_t *); - -/* - *# - *#% blockmap vp L L L - *# +/*! + * @function VNOP_OFFTOBLK + * @abstract Call down to a filesystem to convert a file offset to a logical block number. + * @param vp The vnode for which to convert an offset to a logical block number. + * @param offset File offset to convert. + * @param lblkno Destination for corresponding logical block number. + * @return 0 for success, else an error code. */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_OFFTOBLK(vnode_t, off_t, daddr64_t *); +#endif /* XNU_KERNEL_PRIVATE */ + struct vnop_blockmap_args { struct vnodeop_desc *a_desc; vnode_t a_vp; @@ -849,21 +1575,59 @@ struct vnop_blockmap_args { int a_flags; vfs_context_t a_context; }; + +/*! + * @function VNOP_BLOCKMAP + * @abstract Call down to a filesystem to get information about the on-disk layout of a file region. + * @discussion VNOP_BLOCKMAP() returns the information required to pass a request for a contiguous region + * down to a device's strategy routine. + * @param vp The vnode for which to get on-disk information. + * @param foffset Offset (in bytes) at which region starts. + * @param size Size of region. + * @param bpn Destination for physical block number at which region begins on disk. + * @param run Destination for number of bytes which can be found contiguously on-disk before + * first discontinuity. + * @param poff Currently unused. + * @param flags VNODE_READ: request is for a read. VNODE_WRITE: request is for a write. + * @param ctx Context to authenticate for blockmap request; currently often set to NULL. + * @return 0 for success, else an error code. + */ +#ifdef XNU_KERNEL_PRIVATE extern errno_t VNOP_BLOCKMAP(vnode_t, off_t, size_t, daddr64_t *, size_t *, void *, - int, vfs_context_t); + int, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ struct vnop_strategy_args { struct vnodeop_desc *a_desc; struct buf *a_bp; }; + +/*! + * @function VNOP_STRATEGY + * @abstract Initiate I/O on a file (both read and write). + * @discussion A filesystem strategy routine takes a buffer, performs whatever manipulations are necessary for passing + * the I/O request down to the device layer, and calls the appropriate device's strategy routine. Most filesystems should + * just call buf_strategy() with "bp" as the argument. + * @param bp Complete specificiation of requested I/O: region of data involved, whether request is for read or write, and so on. + * @return 0 for success, else an error code. + */ extern errno_t VNOP_STRATEGY(struct buf *bp); struct vnop_bwrite_args { struct vnodeop_desc *a_desc; buf_t a_bp; }; -extern errno_t VNOP_BWRITE(buf_t); +/*! + * @function VNOP_BWRITE + * @abstract Write a buffer to backing store. + * @discussion VNOP_BWRITE() is called by buf_bawrite() (asynchronous write) and potentially by buf_bdwrite() (delayed write) + * but not by buf_bwrite(). A filesystem may choose to perform some kind of manipulation of the buffer in this routine; it + * generally will end up calling VFS's default implementation, vn_bwrite() (which calls buf_bwrite() without further ado). + * @param bp The buffer to write. + * @return 0 for success, else an error code. + */ +extern errno_t VNOP_BWRITE(buf_t bp); struct vnop_kqfilt_add_args { struct vnodeop_desc *a_desc; @@ -872,7 +1636,10 @@ struct vnop_kqfilt_add_args { vfs_context_t a_context; }; extern struct vnodeop_desc vnop_kqfilt_add_desc; -extern errno_t VNOP_KQFILT_ADD(vnode_t , struct knote *, vfs_context_t); + +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_KQFILT_ADD(vnode_t, struct knote *, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ struct vnop_kqfilt_remove_args { struct vnodeop_desc *a_desc; @@ -881,7 +1648,167 @@ struct vnop_kqfilt_remove_args { vfs_context_t a_context; }; extern struct vnodeop_desc vnop_kqfilt_remove_desc; -errno_t VNOP_KQFILT_REMOVE(vnode_t , uintptr_t , vfs_context_t); + +#ifdef XNU_KERNEL_PRIVATE +errno_t VNOP_KQFILT_REMOVE(vnode_t, uintptr_t, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + + +#ifdef KERNEL_PRIVATE +#define VNODE_MONITOR_BEGIN 0x01 +#define VNODE_MONITOR_END 0x02 +#define VNODE_MONITOR_UPDATE 0x04 +struct vnop_monitor_args { + struct vnodeop_desc *a_desc; + vnode_t a_vp; + uint32_t a_events; + uint32_t a_flags; + void *a_handle; + vfs_context_t a_context; +}; +extern struct vnodeop_desc vnop_monitor_desc; +#endif /* KERNEL_PRIVATE */ + +#ifdef XNU_KERNEL_PRIVATE +/*! + * @function VNOP_MONITOR + * @abstract Indicate to a filesystem that the number of watchers of a file has changed. + * @param vp The vnode whose watch state has changed. + * @param events Unused. Filesystems can ignore this parameter. + * @param flags Type of change to the watch state. VNODE_MONITOR_BEGIN is passed when the kernel + * begins tracking a new watcher of a file. VNODE_MONITOR_END is passed when a watcher stops watching a file. + * VNODE_MONITOR_UPDATE is currently unused. A filesystem is guaranteed that each VNODE_MONITOR_BEGIN + * will be matched by a VNODE_MONITOR_END with the same "handle" argument. + * @param handle Unique identifier for a given watcher. A VNODE_MONITOR_BEGIN for a given handle will be matched with a + * VNODE_MONITOR_END for the same handle; a filesystem need not consider this parameter unless + * it for some reason wants be able to match specific VNOP_MONITOR calls rather than just keeping + * a count. + * @param ctx The context which is starting to monitor a file or ending a watch on a file. A matching + * pair of VNODE_MONITOR_BEGIN and VNODE_MONITOR_END need not have the same context. + * @discussion VNOP_MONITOR() is intended to let networked filesystems know when they should bother + * listening for changes to files which occur remotely, so that they can post notifications using + * vnode_notify(). Local filesystems should not implement a monitor vnop. + * It is called when there is a new watcher for a file or when a watcher for a file goes away. + * Each BEGIN will be matched with an END with the same handle. Note that vnode_ismonitored() can + * be used to see if there are currently watchers for a file. + */ +errno_t VNOP_MONITOR(vnode_t vp, uint32_t events, uint32_t flags, void *handle, vfs_context_t ctx); +#endif /* XNU_KERNEL_PRIVATE */ + +struct label; +struct vnop_setlabel_args { + struct vnodeop_desc *a_desc; + struct vnode *a_vp; + struct label *a_vl; + vfs_context_t a_context; +}; +extern struct vnodeop_desc vnop_setlabel_desc; + +/*! + * @function VNOP_SETLABEL + * @abstract Associate a MACF label with a file. + * @param vp The vnode to label. + * @param label The desired label. + * @param ctx Context to authenticate for label change. + * @return 0 for success, else an error code. + */ +#ifdef XNU_KERNEL_PRIVATE +errno_t VNOP_SETLABEL(vnode_t, struct label *, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + +#ifdef __APPLE_API_UNSTABLE + +#if NAMEDSTREAMS + +enum nsoperation { NS_OPEN, NS_CREATE, NS_DELETE }; + +/* a_flags for vnop_getnamedstream_args: */ +#define NS_GETRAWENCRYPTED 0x00000001 + +struct vnop_getnamedstream_args { + struct vnodeop_desc *a_desc; + vnode_t a_vp; + vnode_t *a_svpp; + const char *a_name; + enum nsoperation a_operation; + int a_flags; + vfs_context_t a_context; +}; + +/*! + * @function VNOP_GETNAMEDSTREAM + * @abstract Get a named stream associated with a file. + * @discussion If this call sucecss, svpp should be returned with an iocount which the caller + * will drop. VFS provides a facility for simulating named streams when interacting with filesystems + * which do not support them. + * @param vp The vnode for which to get a named stream. + * @param svpp Destination for pointer to named stream's vnode. + * @param name The name of the named stream, e.g. "com.apple.ResourceFork". + * @param operation Operation to perform. In HFS and AFP, this parameter is only considered as follows: + * if the resource fork has not been opened and the operation is not NS_OPEN, fail with ENOATTR. Currently + * only passed as NS_OPEN by VFS. + * @param flags Flags used to control getnamedstream behavior. Currently only used for raw-encrypted-requests. + * @param ctx Context to authenticate for getting named stream. + * @return 0 for success, else an error code. + */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_GETNAMEDSTREAM(vnode_t, vnode_t *, const char *, enum nsoperation, int flags, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + +struct vnop_makenamedstream_args { + struct vnodeop_desc *a_desc; + vnode_t *a_svpp; + vnode_t a_vp; + const char *a_name; + int a_flags; + vfs_context_t a_context; +}; + +/*! + * @function VNOP_MAKENAMEDSTREAM + * @abstract Create a named stream associated with a file. + * @discussion If this call succeeds, svpp should be returned with an iocount which the caller will drop. + * VFS provides a facility for simulating named streams when interacting with filesystems + * which do not support them. + * @param vp The vnode for which to get a named stream. + * @param svpp Destination for pointer to named stream's vnode. + * @param name The name of the named stream, e.g. "com.apple.ResourceFork". + * @param flags Currently unused. + * @param ctx Context to authenticate creating named stream. + * @return 0 for success, else an error code. + */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_MAKENAMEDSTREAM(vnode_t, vnode_t *, const char *, int flags, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + +struct vnop_removenamedstream_args { + struct vnodeop_desc *a_desc; + vnode_t a_vp; + vnode_t a_svp; + const char *a_name; + int a_flags; + vfs_context_t a_context; +}; + +/*! + * @function VNOP_REMOVENAMEDSTREAM + * @abstract Delete a named stream associated with a file. + * @discussion VFS provides a facility for simulating named streams when interacting with filesystems + * which do not support them. + * @param vp The vnode to which the named stream belongs. + * @param svp The named stream's vnode. + * @param name The name of the named stream, e.g. "com.apple.ResourceFork". + * @param flags Currently unused. + * @param ctx Context to authenticate deleting named stream. + * @return 0 for success, else an error code. + */ +#ifdef XNU_KERNEL_PRIVATE +extern errno_t VNOP_REMOVENAMEDSTREAM(vnode_t, vnode_t, const char *, int flags, vfs_context_t); +#endif /* XNU_KERNEL_PRIVATE */ + +#endif // NAMEDSTREAMS + +#endif // defined(__APPLE_API_UNSTABLE) __END_DECLS