X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/fe8ab488e9161c46dd9885d58fc52996dc0249ff..4d15aeb193b2c68f1d38666c317f8d3734f5f083:/bsd/vm/dp_backing_file.c diff --git a/bsd/vm/dp_backing_file.c b/bsd/vm/dp_backing_file.c index 31b87e8a0..5548f11fd 100644 --- a/bsd/vm/dp_backing_file.c +++ b/bsd/vm/dp_backing_file.c @@ -44,12 +44,8 @@ #include #include #include -#if CONFIG_PROTECT -#include -#endif #include -#include #include #include @@ -65,7 +61,7 @@ #include #include #include -#include +#include #include @@ -80,43 +76,6 @@ #include -void macx_init(void); - -static lck_grp_t *macx_lock_group; -static lck_mtx_t *macx_lock; - -/* - * 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}}; - -/* ###################################################### */ - -/* - * Routine: macx_init - * Function: - * Initialize locks so that only one caller can change - * state at a time. - */ -void -macx_init(void) -{ - macx_lock_group = lck_grp_alloc_init("macx", NULL); - macx_lock = lck_mtx_alloc_init(macx_lock_group, NULL); -} /* * Routine: macx_backing_store_recovery @@ -127,26 +86,9 @@ macx_init(void) */ 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(); - - 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: - return(error); + return ENOTSUP; } /* @@ -158,24 +100,12 @@ 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; - - lck_mtx_lock(macx_lock); - if ((error = suser(kauth_cred_get(), 0))) - goto backing_store_suspend_return; - - /* Multiple writers protected by macx_lock */ - vm_backing_store_disable(suspend); - -backing_store_suspend_return: - lck_mtx_unlock(macx_lock); - return(error); + return ENOTSUP; } -extern boolean_t backing_store_stop_compaction; + extern boolean_t compressor_store_stop_compaction; /* @@ -198,21 +128,18 @@ macx_backing_store_compaction(int flags) { int error; - lck_mtx_assert(macx_lock, LCK_MTX_ASSERT_OWNED); if ((error = suser(kauth_cred_get(), 0))) return error; if (flags & SWAP_COMPACT_DISABLE) { - backing_store_stop_compaction = TRUE; compressor_store_stop_compaction = TRUE; - kprintf("backing_store_stop_compaction = TRUE\n"); + kprintf("compressor_store_stop_compaction = TRUE\n"); } else if (flags & SWAP_COMPACT_ENABLE) { - backing_store_stop_compaction = FALSE; compressor_store_stop_compaction = FALSE; - kprintf("backing_store_stop_compaction = FALSE\n"); + kprintf("compressor_store_stop_compaction = FALSE\n"); } return 0; @@ -228,244 +155,23 @@ int macx_triggers( struct macx_triggers_args *args) { - int error; + int flags = args->flags; - lck_mtx_lock(macx_lock); - error = suser(kauth_cred_get(), 0); - if (error) - return error; + if (flags & (SWAP_COMPACT_DISABLE | SWAP_COMPACT_ENABLE)) + return (macx_backing_store_compaction(flags)); - error = mach_macx_triggers(args); - - lck_mtx_unlock(macx_lock); - return error; + return ENOTSUP; } -extern boolean_t dp_isssd; - -/* - * In the compressed pager world, the swapfiles are created by the kernel. - * Well, all except the first one. That swapfile is absorbed by the kernel at - * the end of the macx_swapon function (if swap is enabled). That's why - * we allow the first invocation of macx_swapon to succeed. - * - * If the compressor pool is running low, the kernel messages the dynamic pager - * on the port it has registered with the kernel. That port can transport 1 of 2 - * pieces of information to dynamic pager: create a swapfile or delete a swapfile. - * - * We choose to transmit the former. So, that message tells dynamic pager - * to create a swapfile and activate it by calling macx_swapon. - * - * We deny this new macx_swapon request. That leads dynamic pager to interpret the - * failure as a serious error and notify all it's clients that swap is running low. - * That's how we get the loginwindow "Resume / Force Quit Applications" dialog to appear. - * - * NOTE: - * If the kernel has already created multiple swapfiles by the time the compressor - * pool is running low (and it has to play this trick), dynamic pager won't be able to - * create a file in user-space and, that too will lead to a similar notification blast - * to all of it's clients. So, that behaves as desired too. - */ -boolean_t macx_swapon_allowed = TRUE; - -/* - * Routine: macx_swapon - * Function: - * Syscall interface to add a file to backing store - */ int macx_swapon( - struct macx_swapon_args *args) + __unused struct macx_swapon_args *args) { - int size = args->size; - vnode_t vp = (vnode_t)NULL; - struct nameidata nd, *ndp; - register int error; - kern_return_t kr; - mach_port_t backing_store; - memory_object_default_t default_pager; - int i; - off_t file_size; - vfs_context_t ctx = vfs_context_current(); - struct proc *p = current_proc(); - int dp_cluster_size; - - AUDIT_MACH_SYSCALL_ENTER(AUE_SWAPON); - AUDIT_ARG(value32, args->priority); - - lck_mtx_lock(macx_lock); - - if (COMPRESSED_PAGER_IS_ACTIVE) { - if (macx_swapon_allowed == FALSE) { - error = EINVAL; - goto swapon_bailout; - } else { - macx_swapon_allowed = FALSE; - error = 0; - goto swapon_bailout; - } - } - - ndp = &nd; - - if ((error = suser(kauth_cred_get(), 0))) - goto swapon_bailout; - - /* - * Get a vnode for the paging area. - */ - NDINIT(ndp, LOOKUP, OP_LOOKUP, FOLLOW | LOCKLEAF | AUDITVNPATH1, - ((IS_64BIT_PROCESS(p)) ? UIO_USERSPACE64 : UIO_USERSPACE32), - (user_addr_t) args->filename, ctx); - - if ((error = namei(ndp))) - goto swapon_bailout; - nameidone(ndp); - vp = ndp->ni_vp; - - if (vp->v_type != VREG) { - error = EINVAL; - goto swapon_bailout; - } - - /* get file size */ - if ((error = vnode_size(vp, &file_size, ctx)) != 0) - goto swapon_bailout; -#if CONFIG_MACF - vnode_lock(vp); - error = mac_system_check_swapon(vfs_context_ucred(ctx), vp); - vnode_unlock(vp); - if (error) - goto swapon_bailout; -#endif - - /* resize to desired size if it's too small */ - if ((file_size < (off_t)size) && ((error = vnode_setsize(vp, (off_t)size, 0, ctx)) != 0)) - goto swapon_bailout; - -#if CONFIG_PROTECT - { - /* initialize content protection keys manually */ - if ((error = cp_handle_vnop(vp, CP_WRITE_ACCESS, 0)) != 0) { - goto swapon_bailout; - } - } -#endif - - - if (default_pager_init_flag == 0) { - start_def_pager(NULL); - default_pager_init_flag = 1; - } - - /* 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; - } - - /* 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; - } - - if ((dp_isssd = vnode_pager_isSSD(vp)) == TRUE) { - /* - * keep the cluster size small since the - * seek cost is effectively 0 which means - * we don't care much about fragmentation - */ - dp_cluster_size = 2 * PAGE_SIZE; - } else { - /* - * use the default cluster size - */ - dp_cluster_size = 0; - } - kr = default_pager_backing_store_create(default_pager, - -1, /* default priority */ - dp_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; - } - - /* Mark this vnode as being used for swapfile */ - vnode_lock_spin(vp); - SET(vp->v_flag, VSWAP); - vnode_unlock(vp); - - /* - * 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; - - /* This vnode is not to be used for swapfile */ - vnode_lock_spin(vp); - CLR(vp->v_flag, VSWAP); - vnode_unlock(vp); - - goto swapon_bailout; - } - bs_port_table[i].bs = (void *)backing_store; - error = 0; - - ubc_setthreadcred(vp, p, current_thread()); - - /* - * 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); - } - lck_mtx_unlock(macx_lock); - AUDIT_MACH_SYSCALL_EXIT(error); - - if (error) - printf("macx_swapon FAILED - %d\n", error); - else - printf("macx_swapon SUCCESS\n"); - - return(error); + return ENOTSUP; } + /* * Routine: macx_swapoff * Function: @@ -473,110 +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; - vfs_context_t ctx = vfs_context_current(); - int orig_iopol_disk; - - AUDIT_MACH_SYSCALL_ENTER(AUE_SWAPOFF); - - lck_mtx_lock(macx_lock); - - 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, OP_LOOKUP, FOLLOW | LOCKLEAF | AUDITVNPATH1, - ((IS_64BIT_PROCESS(p)) ? UIO_USERSPACE64 : UIO_USERSPACE32), - (user_addr_t) args->filename, ctx); - - if ((error = namei(ndp))) - goto swapoff_bailout; - nameidone(ndp); - vp = ndp->ni_vp; - - if (vp->v_type != VREG) { - error = EINVAL; - goto swapoff_bailout; - } -#if CONFIG_MACF - vnode_lock(vp); - error = mac_system_check_swapoff(vfs_context_ucred(ctx), vp); - vnode_unlock(vp); - if (error) - goto swapoff_bailout; -#endif - - 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; - - orig_iopol_disk = proc_get_task_policy(current_task(), current_thread(), - TASK_POLICY_INTERNAL, TASK_POLICY_IOPOL); - - proc_set_task_policy(current_task(), current_thread(), TASK_POLICY_INTERNAL, - TASK_POLICY_IOPOL, IOPOL_THROTTLE); - - kr = default_pager_backing_store_delete(backing_store); - - proc_set_task_policy(current_task(), current_thread(), TASK_POLICY_INTERNAL, - TASK_POLICY_IOPOL, orig_iopol_disk); - - switch (kr) { - case KERN_SUCCESS: - error = 0; - bs_port_table[i].vp = 0; - /* This vnode is no longer used for swapfile */ - vnode_lock_spin(vp); - CLR(vp->v_flag, VSWAP); - vnode_unlock(vp); - - /* 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); - lck_mtx_unlock(macx_lock); - AUDIT_MACH_SYSCALL_EXIT(error); - - if (error) - printf("macx_swapoff FAILED - %d\n", error); - else - printf("macx_swapoff SUCCESS\n"); - - return(error); + return ENOTSUP; } /* @@ -585,7 +190,6 @@ swapoff_bailout: * Syscall interface to get general swap statistics */ extern uint64_t vm_swap_get_total_space(void); -extern uint64_t vm_swap_get_used_space(void); extern uint64_t vm_swap_get_free_space(void); extern boolean_t vm_swap_up; @@ -596,77 +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; + if (VM_CONFIG_SWAP_IS_PRESENT) { - error = 0; - if (COMPRESSED_PAGER_IS_ACTIVE) { + *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; - if (vm_swap_up == TRUE) { - - *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; - } } else { - - /* - * 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; - } - - /* - * 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) { - *encrypted_p = TRUE; - } else { - *encrypted_p = FALSE; - } - -done: - if (default_pager != MEMORY_OBJECT_DEFAULT_NULL) { - /* release our handle on default pager */ - memory_object_default_deallocate(default_pager); - } + *total_p = 0; + *avail_p = 0; + *pagesize_p = 0; + *encrypted_p = FALSE; } - return error; + return 0; }