X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/d7e50217d7adf6e52786a38bcaa4cd698cb9a79e..8f6c56a50524aa785f7e596d52dddfb331e18961:/bsd/vm/vnode_pager.c diff --git a/bsd/vm/vnode_pager.c b/bsd/vm/vnode_pager.c index 8b1be2843..f6969d1bc 100644 --- a/bsd/vm/vnode_pager.c +++ b/bsd/vm/vnode_pager.c @@ -1,16 +1,19 @@ /* - * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ - * - * Copyright (c) 1999-2003 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. Please obtain a copy of the License at - * http://www.opensource.apple.com/apsl/ and read it before using this - * file. + * 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. + * + * 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 @@ -20,7 +23,7 @@ * Please see the License for the specific language governing rights and * limitations under the License. * - * @APPLE_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * Mach Operating System @@ -39,13 +42,15 @@ #include #include #include +#include #include +#include #include #include -#include +#include #include -#include -#include +#include /* needs internal due to fhandle_t */ +#include #include #include @@ -62,6 +67,13 @@ #include #include +#include + +#include +#include +#include + +#include unsigned int vp_pagein=0; unsigned int vp_pgodirty=0; @@ -72,12 +84,8 @@ unsigned int dp_pgins=0; /* Default pager pageins */ vm_object_offset_t vnode_pager_get_filesize(struct vnode *vp) { - if (UBCINVALID(vp)) { - return (vm_object_offset_t) 0; - } return (vm_object_offset_t) ubc_getsize(vp); - } pager_return_t @@ -89,98 +97,136 @@ vnode_pageout(struct vnode *vp, int flags, int *errorp) { - int result = PAGER_SUCCESS; struct proc *p = current_proc(); + int result = PAGER_SUCCESS; int error = 0; - int blkno=0, s; - int cnt, isize; + int error_ret = 0; + daddr64_t blkno; + int isize; int pg_index; + int base_index; int offset; - struct buf *bp; - boolean_t funnel_state; upl_page_info_t *pl; - upl_t vpupl = NULL; + struct vfs_context context; - funnel_state = thread_funnel_set(kernel_flock, TRUE); + context.vc_proc = p; + context.vc_ucred = kauth_cred_get(); isize = (int)size; if (isize <= 0) { - result = error = PAGER_ERROR; + result = PAGER_ERROR; + error_ret = EINVAL; goto out; } UBCINFOCHECK("vnode_pageout", vp); if (UBCINVALID(vp)) { - result = error = PAGER_ERROR; + result = PAGER_ERROR; + error_ret = EINVAL; if (upl && !(flags & UPL_NOCOMMIT)) ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY); goto out; } - if (upl) { + if ( !(flags & UPL_VNODE_PAGER)) { /* - * This is a pageout from the Default pager, - * just go ahead and call VOP_PAGEOUT + * This is a pageout from the default pager, + * just go ahead and call vnop_pageout since + * it has already sorted out the dirty ranges */ dp_pgouts++; KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_START, size, 1, 0, 0, 0); - if (error = VOP_PAGEOUT(vp, upl, upl_offset, (off_t)f_offset, - (size_t)size, p->p_ucred, flags)) - result = error = PAGER_ERROR; + if ( (error_ret = VNOP_PAGEOUT(vp, upl, upl_offset, (off_t)f_offset, + (size_t)size, flags, &context)) ) + result = PAGER_ERROR; KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_END, size, 1, 0, 0, 0); goto out; } - ubc_create_upl(vp, f_offset, isize, &vpupl, &pl, UPL_FOR_PAGEOUT | UPL_COPYOUT_FROM); - - if (vpupl == (upl_t) 0) { - result = error = PAGER_ABSENT; - goto out; - } /* - * if we get here, we've created the upl and - * are responsible for commiting/aborting it - * regardless of what the caller has passed in + * we come here for pageouts to 'real' files and + * for msyncs... the upl may not contain any + * dirty pages.. it's our responsibility to sort + * through it and find the 'runs' of dirty pages + * to call VNOP_PAGEOUT on... */ - flags &= ~UPL_NOCOMMIT; + pl = ubc_upl_pageinfo(upl); if (ubc_getsize(vp) == 0) { - for (offset = 0; isize; isize -= PAGE_SIZE, - offset += PAGE_SIZE) { - blkno = ubc_offtoblk(vp, (off_t)f_offset); - f_offset += PAGE_SIZE; - if ((bp = incore(vp, blkno)) && - ISSET(bp->b_flags, B_BUSY)) { - ubc_upl_abort_range(vpupl, offset, PAGE_SIZE, - UPL_ABORT_FREE_ON_EMPTY); - result = error = PAGER_ERROR; - continue; - } else if (bp) { - bremfree(bp); - SET(bp->b_flags, B_BUSY | B_INVAL); - brelse(bp); + /* + * if the file has been effectively deleted, then + * we need to go through the UPL and invalidate any + * buffer headers we might have that reference any + * of it's pages + */ + for (offset = upl_offset; isize; isize -= PAGE_SIZE, offset += PAGE_SIZE) { +#if NFSCLIENT + if (vp->v_tag == VT_NFS) + /* check with nfs if page is OK to drop */ + error = nfs_buf_page_inval(vp, (off_t)f_offset); + else +#endif + { + blkno = ubc_offtoblk(vp, (off_t)f_offset); + error = buf_invalblkno(vp, blkno, 0); + } + if (error) { + if ( !(flags & UPL_NOCOMMIT)) + ubc_upl_abort_range(upl, offset, PAGE_SIZE, UPL_ABORT_FREE_ON_EMPTY); + if (error_ret == 0) + error_ret = error; + result = PAGER_ERROR; + + } else if ( !(flags & UPL_NOCOMMIT)) { + ubc_upl_commit_range(upl, offset, PAGE_SIZE, UPL_COMMIT_FREE_ON_EMPTY); } - ubc_upl_commit_range(vpupl, offset, PAGE_SIZE, - UPL_COMMIT_FREE_ON_EMPTY); + f_offset += PAGE_SIZE; } goto out; } - pg_index = 0; - offset = 0; + /* + * Ignore any non-present pages at the end of the + * UPL so that we aren't looking at a upl that + * may already have been freed by the preceeding + * aborts/completions. + */ + base_index = upl_offset / PAGE_SIZE; + + for (pg_index = (upl_offset + isize) / PAGE_SIZE; pg_index > base_index;) { + if (upl_page_present(pl, --pg_index)) + break; + if (pg_index == base_index) { + /* + * no pages were returned, so release + * our hold on the upl and leave + */ + if ( !(flags & UPL_NOCOMMIT)) + ubc_upl_abort_range(upl, upl_offset, isize, UPL_ABORT_FREE_ON_EMPTY); + + goto out; + } + } + isize = (pg_index + 1) * PAGE_SIZE; + + offset = upl_offset; + pg_index = base_index; while (isize) { int xsize; int num_of_pages; - if ( !upl_valid_page(pl, pg_index)) { - ubc_upl_abort_range(vpupl, offset, PAGE_SIZE, - UPL_ABORT_FREE_ON_EMPTY); + if ( !upl_page_present(pl, pg_index)) { + /* + * we asked for RET_ONLY_DIRTY, so it's possible + * to get back empty slots in the UPL + * just skip over them + */ offset += PAGE_SIZE; isize -= PAGE_SIZE; pg_index++; @@ -195,32 +241,31 @@ vnode_pageout(struct vnode *vp, * We also get here from vm_object_terminate() * So all you need to do in these * cases is to invalidate incore buffer if it is there - * Note we must not sleep here if B_BUSY - that is + * Note we must not sleep here if the buffer is busy - that is * a lock inversion which causes deadlock. */ - blkno = ubc_offtoblk(vp, (off_t)(f_offset + offset)); - s = splbio(); vp_pgoclean++; - if ((bp = incore(vp, blkno)) && - ISSET(bp->b_flags, B_BUSY | B_NEEDCOMMIT)) { - splx(s); - ubc_upl_abort_range(vpupl, offset, PAGE_SIZE, - UPL_ABORT_FREE_ON_EMPTY); - result = error = PAGER_ERROR; - offset += PAGE_SIZE; - isize -= PAGE_SIZE; - pg_index++; - continue; - } else if (bp) { - bremfree(bp); - SET(bp->b_flags, B_BUSY | B_INVAL ); - splx(s); - brelse(bp); - } else - splx(s); - - ubc_upl_commit_range(vpupl, offset, PAGE_SIZE, - UPL_COMMIT_FREE_ON_EMPTY); + +#if NFSCLIENT + if (vp->v_tag == VT_NFS) + /* check with nfs if page is OK to drop */ + error = nfs_buf_page_inval(vp, (off_t)(f_offset + offset)); + else +#endif + { + blkno = ubc_offtoblk(vp, (off_t)(f_offset + offset)); + error = buf_invalblkno(vp, blkno, 0); + } + if (error) { + if ( !(flags & UPL_NOCOMMIT)) + ubc_upl_abort_range(upl, offset, PAGE_SIZE, UPL_ABORT_FREE_ON_EMPTY); + if (error_ret == 0) + error_ret = error; + result = PAGER_ERROR; + + } else if ( !(flags & UPL_NOCOMMIT)) { + ubc_upl_commit_range(upl, offset, PAGE_SIZE, UPL_COMMIT_FREE_ON_EMPTY); + } offset += PAGE_SIZE; isize -= PAGE_SIZE; pg_index++; @@ -233,8 +278,6 @@ vnode_pageout(struct vnode *vp, xsize = isize - PAGE_SIZE; while (xsize) { - if ( !upl_valid_page(pl, pg_index + num_of_pages)) - break; if ( !upl_dirty_page(pl, pg_index + num_of_pages)) break; num_of_pages++; @@ -243,13 +286,15 @@ vnode_pageout(struct vnode *vp, xsize = num_of_pages * PAGE_SIZE; KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_START, - xsize, 0, 0, 0, 0); + xsize, (int)(f_offset + offset), 0, 0, 0); - if (error = VOP_PAGEOUT(vp, vpupl, (vm_offset_t)offset, + if ( (error = VNOP_PAGEOUT(vp, upl, (vm_offset_t)offset, (off_t)(f_offset + offset), xsize, - p->p_ucred, flags)) - result = error = PAGER_ERROR; - + flags, &context)) ) { + if (error_ret == 0) + error_ret = error; + result = PAGER_ERROR; + } KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_END, xsize, 0, 0, 0, 0); @@ -259,14 +304,14 @@ vnode_pageout(struct vnode *vp, } out: if (errorp) - *errorp = result; - - thread_funnel_set(kernel_flock, funnel_state); + *errorp = error_ret; - return (error); + return (result); } +void IOSleep(int); + pager_return_t vnode_pagein( struct vnode *vp, @@ -278,20 +323,17 @@ vnode_pagein( int *errorp) { struct proc *p = current_proc(); + struct uthread *ut; upl_page_info_t *pl; int result = PAGER_SUCCESS; int error = 0; - int xfer_size; int pages_in_upl; int start_pg; int last_pg; int first_pg; int xsize; int abort_needed = 1; - boolean_t funnel_state; - - funnel_state = thread_funnel_set(kernel_flock, TRUE); UBCINFOCHECK("vnode_pagein", vp); @@ -309,7 +351,7 @@ vnode_pagein( error = PAGER_ERROR; goto out; } - ubc_create_upl(vp, f_offset, size, &upl, &pl, UPL_RET_ONLY_ABSENT); + ubc_create_upl(vp, f_offset, size, &upl, &pl, UPL_RET_ONLY_ABSENT | UPL_SET_LITE); if (upl == (upl_t)NULL) { result = PAGER_ABSENT; @@ -404,14 +446,16 @@ vnode_pagein( } if (last_pg > start_pg) { int xoff; + struct vfs_context context; + context.vc_proc = p; + context.vc_ucred = kauth_cred_get(); xsize = (last_pg - start_pg) * PAGE_SIZE; xoff = start_pg * PAGE_SIZE; - if (error = VOP_PAGEIN(vp, upl, (vm_offset_t) xoff, + if ( (error = VNOP_PAGEIN(vp, upl, (vm_offset_t) xoff, (off_t)f_offset + xoff, - xsize, p->p_ucred, - flags)) { + xsize, flags, &context)) ) { result = PAGER_ERROR; error = PAGER_ERROR; @@ -424,28 +468,36 @@ vnode_pagein( out: if (errorp) *errorp = result; - thread_funnel_set(kernel_flock, funnel_state); + ut = get_bsdthread_info(current_thread()); + + if (ut->uu_lowpri_delay) { + /* + * task is marked as a low priority I/O type + * and the I/O we issued while in this system call + * collided with normal I/O operations... we'll + * delay in order to mitigate the impact of this + * task on the normal operation of the system + */ + IOSleep(ut->uu_lowpri_delay); + ut->uu_lowpri_delay = 0; + } return (error); } void -vnode_pager_shutdown() +vnode_pager_shutdown(void) { int i; - extern struct bs_map bs_port_table[]; - struct vnode *vp; + vnode_t vp; for(i = 0; i < MAX_BACKING_STORE; i++) { - vp = (struct vnode *)(bs_port_table[i]).vp; + vp = (vnode_t)(bs_port_table[i]).vp; if (vp) { (bs_port_table[i]).vp = 0; - ubc_rele(vp); - /* get rid of macx_swapon() namei() reference */ - vrele(vp); - /* get rid of macx_swapon() "extra" reference */ - vrele(vp); + /* get rid of macx_swapon() reference */ + vnode_rele(vp); } } }