X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/13fec9890cf095cc781fdf7b8917cb03bf32dd4c..4d15aeb193b2c68f1d38666c317f8d3734f5f083:/bsd/vm/dp_backing_file.c diff --git a/bsd/vm/dp_backing_file.c b/bsd/vm/dp_backing_file.c index 92eb65eb9..5548f11fd 100644 --- a/bsd/vm/dp_backing_file.c +++ b/bsd/vm/dp_backing_file.c @@ -1,23 +1,35 @@ /* - * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2010 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@ + */ +/* + * 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. */ #include @@ -31,11 +43,11 @@ #include #include #include +#include #include -#include -#include +#include #include #include @@ -44,11 +56,12 @@ #include #include +#include #include #include #include #include -#include +#include #include @@ -57,28 +70,11 @@ #include #include #include +#if CONFIG_MACF +#include +#endif -extern thread_t current_act(void); - -/* - * temporary support for delayed instantiation - * of default_pager - */ -int default_pager_init_flag = 0; - -struct bs_map bs_port_table[MAX_BACKING_STORE] = { - {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, - {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, - {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, - {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, - {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, - {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, - {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, - {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, - {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, - {0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}}; - -/* ###################################################### */ +#include /* @@ -90,29 +86,9 @@ struct bs_map bs_port_table[MAX_BACKING_STORE] = { */ int macx_backing_store_recovery( - struct macx_backing_store_recovery_args *args) + __unused struct macx_backing_store_recovery_args *args) { - int pid = args->pid; - int error; - struct proc *p = current_proc(); - boolean_t funnel_state; - - funnel_state = thread_funnel_set(kernel_flock, TRUE); - if ((error = suser(kauth_cred_get(), 0))) - goto backing_store_recovery_return; - - /* for now restrict backing_store_recovery */ - /* usage to only present task */ - if(pid != proc_selfpid()) { - error = EINVAL; - goto backing_store_recovery_return; - } - - task_backing_store_privileged(p->task); - -backing_store_recovery_return: - (void) thread_funnel_set(kernel_flock, FALSE); - return(error); + return ENOTSUP; } /* @@ -124,168 +100,78 @@ backing_store_recovery_return: int macx_backing_store_suspend( - struct macx_backing_store_suspend_args *args) + __unused struct macx_backing_store_suspend_args *args) { - boolean_t suspend = args->suspend; - int error; - boolean_t funnel_state; - - funnel_state = thread_funnel_set(kernel_flock, TRUE); - if ((error = suser(kauth_cred_get(), 0))) - goto backing_store_suspend_return; + return ENOTSUP; +} - vm_backing_store_disable(suspend); -backing_store_suspend_return: - (void) thread_funnel_set(kernel_flock, FALSE); - return(error); -} +extern boolean_t compressor_store_stop_compaction; /* - * Routine: macx_swapon + * Routine: macx_backing_store_compaction * Function: - * Syscall interface to add a file to backing store + * Turn compaction of swap space on or off. This is + * used during shutdown/restart so that the kernel + * doesn't waste time compacting swap files that are + * about to be deleted anyway. Compaction is always + * on by default when the system comes up and is turned + * off when a shutdown/restart is requested. It is + * re-enabled if the shutdown/restart is aborted for any reason. + * + * This routine assumes macx_lock has been locked by macx_triggers -> + * mach_macx_triggers -> macx_backing_store_compaction */ + int -macx_swapon( - struct macx_swapon_args *args) +macx_backing_store_compaction(int flags) { - int size = args->size; - vnode_t vp = (vnode_t)NULL; - struct nameidata nd, *ndp; - struct proc *p = current_proc(); - register int error; - kern_return_t kr; - mach_port_t backing_store; - memory_object_default_t default_pager; - int i; - boolean_t funnel_state; - off_t file_size; - struct vfs_context context; - - context.vc_proc = p; - context.vc_ucred = kauth_cred_get(); - - AUDIT_MACH_SYSCALL_ENTER(AUE_SWAPON); - AUDIT_ARG(value, args->priority); - - funnel_state = thread_funnel_set(kernel_flock, TRUE); - ndp = &nd; + int error; if ((error = suser(kauth_cred_get(), 0))) - goto swapon_bailout; + return error; - if(default_pager_init_flag == 0) { - start_def_pager(NULL); - default_pager_init_flag = 1; - } + if (flags & SWAP_COMPACT_DISABLE) { + compressor_store_stop_compaction = TRUE; - /* - * Get a vnode for the paging area. - */ - NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNPATH1, - ((IS_64BIT_PROCESS(p)) ? UIO_USERSPACE64 : UIO_USERSPACE32), - CAST_USER_ADDR_T(args->filename), &context); - - if ((error = namei(ndp))) - goto swapon_bailout; - nameidone(ndp); - vp = ndp->ni_vp; - - if (vp->v_type != VREG) { - error = EINVAL; - goto swapon_bailout; - } - UBCINFOCHECK("macx_swapon", vp); - - /* get file size */ - if ((error = vnode_size(vp, &file_size, &context)) != 0) - goto swapon_bailout; - - /* resize to desired size if it's too small */ - if ((file_size < (off_t)size) && ((error = vnode_setsize(vp, (off_t)size, 0, &context)) != 0)) - goto swapon_bailout; - - /* add new backing store to list */ - i = 0; - while(bs_port_table[i].vp != 0) { - if(i == MAX_BACKING_STORE) - break; - i++; - } - if(i == MAX_BACKING_STORE) { - error = ENOMEM; - goto swapon_bailout; - } + kprintf("compressor_store_stop_compaction = TRUE\n"); - /* remember the vnode. This vnode has namei() reference */ - bs_port_table[i].vp = vp; - - /* - * Look to see if we are already paging to this file. - */ - /* make certain the copy send of kernel call will work */ - default_pager = MEMORY_OBJECT_DEFAULT_NULL; - kr = host_default_memory_manager(host_priv_self(), &default_pager, 0); - if(kr != KERN_SUCCESS) { - error = EAGAIN; - bs_port_table[i].vp = 0; - goto swapon_bailout; - } + } else if (flags & SWAP_COMPACT_ENABLE) { + compressor_store_stop_compaction = FALSE; - kr = default_pager_backing_store_create(default_pager, - -1, /* default priority */ - 0, /* default cluster size */ - &backing_store); - memory_object_default_deallocate(default_pager); - - if(kr != KERN_SUCCESS) { - error = ENOMEM; - bs_port_table[i].vp = 0; - goto swapon_bailout; + kprintf("compressor_store_stop_compaction = FALSE\n"); } - /* - * NOTE: we are able to supply PAGE_SIZE here instead of - * an actual record size or block number because: - * a: we do not support offsets from the beginning of the - * file (allowing for non page size/record modulo offsets. - * b: because allow paging will be done modulo page size - */ - - kr = default_pager_add_file(backing_store, (vnode_ptr_t) vp, - PAGE_SIZE, (int)(file_size/PAGE_SIZE)); - if(kr != KERN_SUCCESS) { - bs_port_table[i].vp = 0; - if(kr == KERN_INVALID_ARGUMENT) - error = EINVAL; - else - error = ENOMEM; - goto swapon_bailout; - } - bs_port_table[i].bs = (void *)backing_store; - error = 0; + return 0; +} + +/* + * Routine: macx_triggers + * Function: + * Syscall interface to set the call backs for low and + * high water marks. + */ +int +macx_triggers( + struct macx_triggers_args *args) +{ + int flags = args->flags; - /* Mark this vnode as being used for swapfile */ - SET(vp->v_flag, VSWAP); + if (flags & (SWAP_COMPACT_DISABLE | SWAP_COMPACT_ENABLE)) + return (macx_backing_store_compaction(flags)); - ubc_setthreadcred(vp, p, current_thread()); + return ENOTSUP; +} - /* - * take a long term reference on the vnode to keep - * vnreclaim() away from this vnode. - */ - vnode_ref(vp); -swapon_bailout: - if (vp) { - vnode_put(vp); - } - (void) thread_funnel_set(kernel_flock, FALSE); - AUDIT_MACH_SYSCALL_EXIT(error); - return(error); +int +macx_swapon( + __unused struct macx_swapon_args *args) +{ + return ENOTSUP; } + /* * Routine: macx_swapoff * Function: @@ -293,88 +179,9 @@ swapon_bailout: */ int macx_swapoff( - struct macx_swapoff_args *args) + __unused struct macx_swapoff_args *args) { - __unused int flags = args->flags; - kern_return_t kr; - mach_port_t backing_store; - - struct vnode *vp = 0; - struct nameidata nd, *ndp; - struct proc *p = current_proc(); - int i; - int error; - boolean_t funnel_state; - struct vfs_context context; - - context.vc_proc = p; - context.vc_ucred = kauth_cred_get(); - - AUDIT_MACH_SYSCALL_ENTER(AUE_SWAPOFF); - - funnel_state = thread_funnel_set(kernel_flock, TRUE); - backing_store = NULL; - ndp = &nd; - - if ((error = suser(kauth_cred_get(), 0))) - goto swapoff_bailout; - - /* - * Get the vnode for the paging area. - */ - NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNPATH1, - ((IS_64BIT_PROCESS(p)) ? UIO_USERSPACE64 : UIO_USERSPACE32), - CAST_USER_ADDR_T(args->filename), &context); - - if ((error = namei(ndp))) - goto swapoff_bailout; - nameidone(ndp); - vp = ndp->ni_vp; - - if (vp->v_type != VREG) { - error = EINVAL; - goto swapoff_bailout; - } - - for(i = 0; i < MAX_BACKING_STORE; i++) { - if(bs_port_table[i].vp == vp) { - break; - } - } - if (i == MAX_BACKING_STORE) { - error = EINVAL; - goto swapoff_bailout; - } - backing_store = (mach_port_t)bs_port_table[i].bs; - - kr = default_pager_backing_store_delete(backing_store); - switch (kr) { - case KERN_SUCCESS: - error = 0; - bs_port_table[i].vp = 0; - /* This vnode is no longer used for swapfile */ - CLR(vp->v_flag, VSWAP); - - /* get rid of macx_swapon() "long term" reference */ - vnode_rele(vp); - - break; - case KERN_FAILURE: - error = EAGAIN; - break; - default: - error = EAGAIN; - break; - } - -swapoff_bailout: - /* get rid of macx_swapoff() namei() reference */ - if (vp) - vnode_put(vp); - - (void) thread_funnel_set(kernel_flock, FALSE); - AUDIT_MACH_SYSCALL_EXIT(error); - return(error); + return ENOTSUP; } /* @@ -382,6 +189,10 @@ swapoff_bailout: * Function: * Syscall interface to get general swap statistics */ +extern uint64_t vm_swap_get_total_space(void); +extern uint64_t vm_swap_get_free_space(void); +extern boolean_t vm_swap_up; + int macx_swapinfo( memory_object_size_t *total_p, @@ -389,59 +200,19 @@ macx_swapinfo( vm_size_t *pagesize_p, boolean_t *encrypted_p) { - int error; - memory_object_default_t default_pager; - default_pager_info_64_t dpi64; - kern_return_t kr; - - error = 0; - - /* - * Get a handle on the default pager. - */ - default_pager = MEMORY_OBJECT_DEFAULT_NULL; - kr = host_default_memory_manager(host_priv_self(), &default_pager, 0); - if (kr != KERN_SUCCESS) { - error = EAGAIN; /* XXX why EAGAIN ? */ - goto done; - } - if (default_pager == MEMORY_OBJECT_DEFAULT_NULL) { - /* - * The default pager has not initialized yet, - * so it can't be using any swap space at all. - */ - *total_p = 0; - *avail_p = 0; - *pagesize_p = 0; - *encrypted_p = FALSE; - goto done; - } - - /* - * Get swap usage data from default pager. - */ - kr = default_pager_info_64(default_pager, &dpi64); - if (kr != KERN_SUCCESS) { - error = ENOTSUP; - goto done; - } + if (VM_CONFIG_SWAP_IS_PRESENT) { - /* - * Provide default pager info to caller. - */ - *total_p = dpi64.dpi_total_space; - *avail_p = dpi64.dpi_free_space; - *pagesize_p = dpi64.dpi_page_size; - if (dpi64.dpi_flags & DPI_ENCRYPTED) { + *total_p = vm_swap_get_total_space(); + *avail_p = vm_swap_get_free_space(); + *pagesize_p = (vm_size_t)PAGE_SIZE_64; *encrypted_p = TRUE; + } else { + + *total_p = 0; + *avail_p = 0; + *pagesize_p = 0; *encrypted_p = FALSE; } - -done: - if (default_pager != MEMORY_OBJECT_DEFAULT_NULL) { - /* release our handle on default pager */ - memory_object_default_deallocate(default_pager); - } - return error; + return 0; }