/* * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. * * 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. * * 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, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ /* * Copyright (c) 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)vfs_cluster.c 8.10 (Berkeley) 3/28/95 */ #include #include #include #include #include #include #include #include #include #include #include #include #define CL_READ 0x01 #define CL_ASYNC 0x02 #define CL_COMMIT 0x04 #define CL_PAGEOUT 0x10 #define CL_AGE 0x20 #define CL_DUMP 0x40 #define CL_NOZERO 0x80 #define CL_PAGEIN 0x100 #define CL_DEV_MEMORY 0x200 #define CL_PRESERVE 0x400 struct clios { u_int io_completed; /* amount of io that has currently completed */ u_int io_issued; /* amount of io that was successfully issued */ int io_error; /* error code of first error encountered */ int io_wanted; /* someone is sleeping waiting for a change in state */ }; static void cluster_zero(upl_t upl, vm_offset_t upl_offset, int size, struct buf *bp); static int cluster_read_x(struct vnode *vp, struct uio *uio, off_t filesize, int devblocksize, int flags); static int cluster_write_x(struct vnode *vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t headOff, off_t tailOff, int devblocksize, int flags); static int cluster_nocopy_read(struct vnode *vp, struct uio *uio, off_t filesize, int devblocksize, int flags); static int cluster_nocopy_write(struct vnode *vp, struct uio *uio, off_t newEOF, int devblocksize, int flags); static int cluster_phys_read(struct vnode *vp, struct uio *uio, off_t filesize, int devblocksize, int flags); static int cluster_phys_write(struct vnode *vp, struct uio *uio, off_t newEOF, int devblocksize, int flags); static int cluster_align_phys_io(struct vnode *vp, struct uio *uio, vm_offset_t usr_paddr, int xsize, int devblocksize, int flags); static int cluster_push_x(struct vnode *vp, off_t EOF, daddr_t first, daddr_t last, int can_delay); static int cluster_try_push(struct vnode *vp, off_t newEOF, int can_delay, int push_all); /* * throttle the number of async writes that * can be outstanding on a single vnode * before we issue a synchronous write */ #define ASYNC_THROTTLE 9 static int cluster_iodone(bp) struct buf *bp; { int b_flags; int error; int total_size; int total_resid; int upl_offset; int zero_offset; upl_t upl; struct buf *cbp; struct buf *cbp_head; struct buf *cbp_next; struct buf *real_bp; struct vnode *vp; struct clios *iostate; int commit_size; int pg_offset; cbp_head = (struct buf *)(bp->b_trans_head); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_START, (int)cbp_head, bp->b_lblkno, bp->b_bcount, bp->b_flags, 0); for (cbp = cbp_head; cbp; cbp = cbp->b_trans_next) { /* * all I/O requests that are part of this transaction * have to complete before we can process it */ if ( !(cbp->b_flags & B_DONE)) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END, (int)cbp_head, (int)cbp, cbp->b_bcount, cbp->b_flags, 0); return 0; } } error = 0; total_size = 0; total_resid = 0; cbp = cbp_head; upl_offset = cbp->b_uploffset; upl = cbp->b_pagelist; b_flags = cbp->b_flags; real_bp = cbp->b_real_bp; vp = cbp->b_vp; zero_offset= cbp->b_validend; iostate = (struct clios *)cbp->b_iostate; while (cbp) { if (cbp->b_vectorcount > 1) _FREE(cbp->b_vectorlist, M_SEGMENT); if ((cbp->b_flags & B_ERROR) && error == 0) error = cbp->b_error; total_resid += cbp->b_resid; total_size += cbp->b_bcount; cbp_next = cbp->b_trans_next; free_io_buf(cbp); cbp = cbp_next; } if (zero_offset) cluster_zero(upl, zero_offset, PAGE_SIZE - (zero_offset & PAGE_MASK), real_bp); if ((vp->v_flag & VTHROTTLED) && (vp->v_numoutput <= (ASYNC_THROTTLE / 3))) { vp->v_flag &= ~VTHROTTLED; wakeup((caddr_t)&vp->v_numoutput); } if (iostate) { /* * someone has issued multiple I/Os asynchrounsly * and is waiting for them to complete (streaming) */ if (error && iostate->io_error == 0) iostate->io_error = error; iostate->io_completed += total_size; if (iostate->io_wanted) { /* * someone is waiting for the state of * this io stream to change */ iostate->io_wanted = 0; wakeup((caddr_t)&iostate->io_wanted); } } if ((b_flags & B_NEED_IODONE) && real_bp) { if (error) { real_bp->b_flags |= B_ERROR; real_bp->b_error = error; } real_bp->b_resid = total_resid; biodone(real_bp); } if (error == 0 && total_resid) error = EIO; if (b_flags & B_COMMIT_UPL) { pg_offset = upl_offset & PAGE_MASK; commit_size = (((pg_offset + total_size) + (PAGE_SIZE - 1)) / PAGE_SIZE) * PAGE_SIZE; if (error || (b_flags & B_NOCACHE) || ((b_flags & B_PHYS) && !(b_flags & B_READ))) { int upl_abort_code; if (b_flags & B_PHYS) upl_abort_code = UPL_ABORT_FREE_ON_EMPTY; else if ((b_flags & B_PAGEOUT) && (error != ENXIO)) /* transient error */ upl_abort_code = UPL_ABORT_FREE_ON_EMPTY; else if (b_flags & B_PGIN) upl_abort_code = UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_ERROR; else upl_abort_code = UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_DUMP_PAGES; ubc_upl_abort_range(upl, upl_offset - pg_offset, commit_size, upl_abort_code); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END, (int)upl, upl_offset - pg_offset, commit_size, 0x80000000|upl_abort_code, 0); } else { int upl_commit_flags = UPL_COMMIT_FREE_ON_EMPTY; if (b_flags & B_PHYS) upl_commit_flags |= UPL_COMMIT_SET_DIRTY; else if ( !(b_flags & B_PAGEOUT)) upl_commit_flags |= UPL_COMMIT_CLEAR_DIRTY; if (b_flags & B_AGE) upl_commit_flags |= UPL_COMMIT_INACTIVATE; ubc_upl_commit_range(upl, upl_offset - pg_offset, commit_size, upl_commit_flags); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END, (int)upl, upl_offset - pg_offset, commit_size, upl_commit_flags, 0); } } else KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END, (int)upl, upl_offset, 0, error, 0); return (error); } static void cluster_zero(upl, upl_offset, size, bp) upl_t upl; vm_offset_t upl_offset; int size; struct buf *bp; { vm_offset_t io_addr = 0; int must_unmap = 0; kern_return_t kret; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 23)) | DBG_FUNC_NONE, upl_offset, size, (int)bp, 0, 0); if (bp == NULL || bp->b_data == NULL) { kret = ubc_upl_map(upl, &io_addr); if (kret != KERN_SUCCESS) panic("cluster_zero: ubc_upl_map() failed with (%d)", kret); if (io_addr == 0) panic("cluster_zero: ubc_upl_map() mapped 0"); must_unmap = 1; } else io_addr = (vm_offset_t)bp->b_data; bzero((caddr_t)(io_addr + upl_offset), size); if (must_unmap) { kret = ubc_upl_unmap(upl); if (kret != KERN_SUCCESS) panic("cluster_zero: kernel_upl_unmap failed"); } } static int cluster_io(vp, upl, upl_offset, f_offset, non_rounded_size, devblocksize, flags, real_bp, iostate) struct vnode *vp; upl_t upl; vm_offset_t upl_offset; off_t f_offset; int non_rounded_size; int devblocksize; int flags; struct buf *real_bp; struct clios *iostate; { struct buf *cbp; struct iovec *iovp; u_int size; u_int io_size; int io_flags; int error = 0; int retval = 0; struct buf *cbp_head = 0; struct buf *cbp_tail = 0; upl_page_info_t *pl; int buf_count = 0; int pg_count; int pg_offset; u_int max_iosize; u_int max_vectors; int priv; int zero_offset = 0; u_int first_lblkno; if (flags & CL_READ) { io_flags = (B_VECTORLIST | B_READ); vfs_io_attributes(vp, B_READ, &max_iosize, &max_vectors); } else { io_flags = (B_VECTORLIST | B_WRITEINPROG); vfs_io_attributes(vp, B_WRITE, &max_iosize, &max_vectors); } pl = ubc_upl_pageinfo(upl); if (flags & CL_AGE) io_flags |= B_AGE; if (flags & CL_DUMP) io_flags |= B_NOCACHE; if (flags & CL_PAGEIN) io_flags |= B_PGIN; if (flags & CL_PAGEOUT) io_flags |= B_PAGEOUT; if (flags & CL_COMMIT) io_flags |= B_COMMIT_UPL; if (flags & CL_PRESERVE) io_flags |= B_PHYS; if (devblocksize) size = (non_rounded_size + (devblocksize - 1)) & ~(devblocksize - 1); else size = non_rounded_size; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 22)) | DBG_FUNC_START, (int)f_offset, size, upl_offset, flags, 0); if ((flags & CL_READ) && ((upl_offset + non_rounded_size) & PAGE_MASK) && (!(flags & CL_NOZERO))) { /* * then we are going to end up * with a page that we can't complete (the file size wasn't a multiple * of PAGE_SIZE and we're trying to read to the end of the file * so we'll go ahead and zero out the portion of the page we can't * read in from the file */ zero_offset = upl_offset + non_rounded_size; } while (size) { int vsize; int i; int pl_index; int pg_resid; int num_contig; daddr_t lblkno; daddr_t blkno; if (size > max_iosize) io_size = max_iosize; else io_size = size; if (error = VOP_CMAP(vp, f_offset, io_size, &blkno, (size_t *)&io_size, NULL)) { if (error == EOPNOTSUPP) panic("VOP_CMAP Unimplemented"); break; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 24)) | DBG_FUNC_NONE, (int)f_offset, (int)blkno, io_size, zero_offset, 0); if ( (!(flags & CL_READ) && (long)blkno == -1) || io_size == 0) { if (flags & CL_PAGEOUT) { error = EINVAL; break; }; /* Try paging out the page individually before giving up entirely and dumping it (it could be mapped in a "hole" and require allocation before the I/O: */ ubc_upl_abort_range(upl, upl_offset, PAGE_SIZE_64, UPL_ABORT_FREE_ON_EMPTY); if (ubc_pushdirty_range(vp, f_offset, PAGE_SIZE_64) == 0) { error = EINVAL; break; }; upl_offset += PAGE_SIZE_64; f_offset += PAGE_SIZE_64; size -= PAGE_SIZE_64; continue; } lblkno = (daddr_t)(f_offset / PAGE_SIZE_64); /* * we have now figured out how much I/O we can do - this is in 'io_size' * pl_index represents the first page in the 'upl' that the I/O will occur for * pg_offset is the starting point in the first page for the I/O * pg_count is the number of full and partial pages that 'io_size' encompasses */ pl_index = upl_offset / PAGE_SIZE; pg_offset = upl_offset & PAGE_MASK; pg_count = (io_size + pg_offset + (PAGE_SIZE - 1)) / PAGE_SIZE; if (flags & CL_DEV_MEMORY) { /* * currently, can't deal with reading 'holes' in file */ if ((long)blkno == -1) { error = EINVAL; break; } /* * treat physical requests as one 'giant' page */ pg_count = 1; } if ((flags & CL_READ) && (long)blkno == -1) { int bytes_to_zero; /* * if we're reading and blkno == -1, then we've got a * 'hole' in the file that we need to deal with by zeroing * out the affected area in the upl */ if (zero_offset && io_size == size) { /* * if this upl contains the EOF and it is not a multiple of PAGE_SIZE * than 'zero_offset' will be non-zero * if the 'hole' returned by VOP_CMAP extends all the way to the eof * (indicated by the io_size finishing off the I/O request for this UPL) * than we're not going to issue an I/O for the * last page in this upl... we need to zero both the hole and the tail * of the page beyond the EOF, since the delayed zero-fill won't kick in */ bytes_to_zero = (((upl_offset + io_size) + (PAGE_SIZE - 1)) & ~PAGE_MASK) - upl_offset; zero_offset = 0; } else bytes_to_zero = io_size; cluster_zero(upl, upl_offset, bytes_to_zero, real_bp); if (cbp_head) /* * if there is a current I/O chain pending * then the first page of the group we just zero'd * will be handled by the I/O completion if the zero * fill started in the middle of the page */ pg_count = (io_size - pg_offset) / PAGE_SIZE; else { /* * no pending I/O to pick up that first page * so, we have to make sure it gets committed * here. * set the pg_offset to 0 so that the upl_commit_range * starts with this page */ pg_count = (io_size + pg_offset) / PAGE_SIZE; pg_offset = 0; } if (io_size == size && ((upl_offset + io_size) & PAGE_MASK)) /* * if we're done with the request for this UPL * then we have to make sure to commit the last page * even if we only partially zero-filled it */ pg_count++; if (pg_count) { if (pg_offset) pg_resid = PAGE_SIZE - pg_offset; else pg_resid = 0; if (flags & CL_COMMIT) ubc_upl_commit_range(upl, (upl_offset + pg_resid) & ~PAGE_MASK, pg_count * PAGE_SIZE, UPL_COMMIT_CLEAR_DIRTY | UPL_COMMIT_FREE_ON_EMPTY); } upl_offset += io_size; f_offset += io_size; size -= io_size; if (cbp_head && pg_count) goto start_io; continue; } else if (real_bp && (real_bp->b_blkno == real_bp->b_lblkno)) { real_bp->b_blkno = blkno; } if (pg_count > 1) { if (pg_count > max_vectors) { io_size -= (pg_count - max_vectors) * PAGE_SIZE; if (io_size < 0) { io_size = PAGE_SIZE - pg_offset; pg_count = 1; } else pg_count = max_vectors; } /* * we need to allocate space for the vector list */ if (pg_count > 1) { iovp = (struct iovec *)_MALLOC(sizeof(struct iovec) * pg_count, M_SEGMENT, M_NOWAIT); if (iovp == (struct iovec *) 0) { /* * if the allocation fails, then throttle down to a single page */ io_size = PAGE_SIZE - pg_offset; pg_count = 1; } } } /* Throttle the speculative IO */ if ((flags & CL_ASYNC) && !(flags & CL_PAGEOUT)) priv = 0; else priv = 1; cbp = alloc_io_buf(vp, priv); if (pg_count == 1) /* * we use the io vector that's reserved in the buffer header * this insures we can always issue an I/O even in a low memory * condition that prevents the _MALLOC from succeeding... this * is necessary to prevent deadlocks with the pager */ iovp = (struct iovec *)(&cbp->b_vects[0]); cbp->b_vectorlist = (void *)iovp; cbp->b_vectorcount = pg_count; if (flags & CL_DEV_MEMORY) { iovp->iov_len = io_size; iovp->iov_base = (caddr_t)upl_phys_page(pl, 0); if (iovp->iov_base == (caddr_t) 0) { free_io_buf(cbp); error = EINVAL; } else iovp->iov_base += upl_offset; } else { for (i = 0, vsize = io_size; i < pg_count; i++, iovp++) { int psize; psize = PAGE_SIZE - pg_offset; if (psize > vsize) psize = vsize; iovp->iov_len = psize; iovp->iov_base = (caddr_t)upl_phys_page(pl, pl_index + i); if (iovp->iov_base == (caddr_t) 0) { if (pg_count > 1) _FREE(cbp->b_vectorlist, M_SEGMENT); free_io_buf(cbp); error = EINVAL; break; } iovp->iov_base += pg_offset; pg_offset = 0; if (flags & CL_PAGEOUT) { int s; struct buf *bp; s = splbio(); if (bp = incore(vp, lblkno + i)) { if (!ISSET(bp->b_flags, B_BUSY)) { bremfree(bp); SET(bp->b_flags, (B_BUSY | B_INVAL)); splx(s); brelse(bp); } else panic("BUSY bp found in cluster_io"); } splx(s); } vsize -= psize; } } if (error) break; if (flags & CL_ASYNC) { cbp->b_flags |= (B_CALL | B_ASYNC); cbp->b_iodone = (void *)cluster_iodone; } cbp->b_flags |= io_flags; cbp->b_lblkno = lblkno; cbp->b_blkno = blkno; cbp->b_bcount = io_size; cbp->b_pagelist = upl; cbp->b_uploffset = upl_offset; cbp->b_trans_next = (struct buf *)0; if (cbp->b_iostate = (void *)iostate) /* * caller wants to track the state of this * io... bump the amount issued against this stream */ iostate->io_issued += io_size; if (flags & CL_READ) KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 26)) | DBG_FUNC_NONE, cbp->b_lblkno, cbp->b_blkno, upl_offset, io_size, 0); else KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 27)) | DBG_FUNC_NONE, cbp->b_lblkno, cbp->b_blkno, upl_offset, io_size, 0); if (cbp_head) { cbp_tail->b_trans_next = cbp; cbp_tail = cbp; } else { cbp_head = cbp; cbp_tail = cbp; } (struct buf *)(cbp->b_trans_head) = cbp_head; buf_count++; upl_offset += io_size; f_offset += io_size; size -= io_size; if ( (!(upl_offset & PAGE_MASK) && !(flags & CL_DEV_MEMORY) && ((flags & CL_ASYNC) || buf_count > 8)) || size == 0) { /* * if we have no more I/O to issue or * the current I/O we've prepared fully * completes the last page in this request * and it's either an ASYNC request or * we've already accumulated more than 8 I/O's into * this transaction and it's not an I/O directed to * special DEVICE memory * then go ahead and issue the I/O */ start_io: if (real_bp) { cbp_head->b_flags |= B_NEED_IODONE; cbp_head->b_real_bp = real_bp; } else cbp_head->b_real_bp = (struct buf *)NULL; if (size == 0) { /* * we're about to issue the last I/O for this upl * if this was a read to the eof and the eof doesn't * finish on a page boundary, than we need to zero-fill * the rest of the page.... */ cbp_head->b_validend = zero_offset; } else cbp_head->b_validend = 0; for (cbp = cbp_head; cbp;) { struct buf * cbp_next; if (io_flags & B_WRITEINPROG) cbp->b_vp->v_numoutput++; cbp_next = cbp->b_trans_next; (void) VOP_STRATEGY(cbp); cbp = cbp_next; } if ( !(flags & CL_ASYNC)) { for (cbp = cbp_head; cbp; cbp = cbp->b_trans_next) biowait(cbp); if (error = cluster_iodone(cbp_head)) { if ((flags & CL_PAGEOUT) && (error == ENXIO)) retval = 0; /* drop the error */ else retval = error; error = 0; } } cbp_head = (struct buf *)0; cbp_tail = (struct buf *)0; buf_count = 0; } } if (error) { int abort_size; io_size = 0; for (cbp = cbp_head; cbp;) { struct buf * cbp_next; if (cbp->b_vectorcount > 1) _FREE(cbp->b_vectorlist, M_SEGMENT); upl_offset -= cbp->b_bcount; size += cbp->b_bcount; io_size += cbp->b_bcount; cbp_next = cbp->b_trans_next; free_io_buf(cbp); cbp = cbp_next; } if (iostate) { /* * update the error condition for this stream * since we never really issued the io * just go ahead and adjust it back */ if (iostate->io_error == 0) iostate->io_error = error; iostate->io_issued -= io_size; if (iostate->io_wanted) { /* * someone is waiting for the state of * this io stream to change */ iostate->io_wanted = 0; wakeup((caddr_t)&iostate->io_wanted); } } pg_offset = upl_offset & PAGE_MASK; abort_size = ((size + pg_offset + (PAGE_SIZE - 1)) / PAGE_SIZE) * PAGE_SIZE; if (flags & CL_COMMIT) { int upl_abort_code; if (flags & CL_PRESERVE) upl_abort_code = UPL_ABORT_FREE_ON_EMPTY; else if ((flags & CL_PAGEOUT) && (error != ENXIO)) /* transient error */ upl_abort_code = UPL_ABORT_FREE_ON_EMPTY; else if (flags & CL_PAGEIN) upl_abort_code = UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_ERROR; else upl_abort_code = UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_DUMP_PAGES; ubc_upl_abort_range(upl, upl_offset - pg_offset, abort_size, upl_abort_code); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 28)) | DBG_FUNC_NONE, (int)upl, upl_offset - pg_offset, abort_size, error, 0); } if (real_bp) { real_bp->b_flags |= B_ERROR; real_bp->b_error = error; biodone(real_bp); } if (retval == 0) retval = error; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 22)) | DBG_FUNC_END, (int)f_offset, size, upl_offset, retval, 0); return (retval); } static int cluster_rd_prefetch(vp, f_offset, size, filesize, devblocksize) struct vnode *vp; off_t f_offset; u_int size; off_t filesize; int devblocksize; { int pages_to_fetch; int skipped_pages; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 49)) | DBG_FUNC_START, (int)f_offset, size, (int)filesize, 0, 0); if (f_offset >= filesize) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 49)) | DBG_FUNC_END, (int)f_offset, 0, 0, 0, 0); return(0); } if (size > (MAX_UPL_TRANSFER * PAGE_SIZE)) size = MAX_UPL_TRANSFER * PAGE_SIZE; else size = (size + (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1); if ((off_t)size > (filesize - f_offset)) size = filesize - f_offset; pages_to_fetch = (size + (PAGE_SIZE - 1)) / PAGE_SIZE; for (skipped_pages = 0; skipped_pages < pages_to_fetch; skipped_pages++) { if (ubc_page_op(vp, f_offset, 0, 0, 0) != KERN_SUCCESS) break; f_offset += PAGE_SIZE; size -= PAGE_SIZE; } if (skipped_pages < pages_to_fetch) advisory_read(vp, filesize, f_offset, size, devblocksize); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 49)) | DBG_FUNC_END, (int)f_offset + (pages_to_fetch * PAGE_SIZE), skipped_pages, 0, 1, 0); return (pages_to_fetch); } static void cluster_rd_ahead(vp, b_lblkno, e_lblkno, filesize, devblocksize) struct vnode *vp; daddr_t b_lblkno; daddr_t e_lblkno; off_t filesize; int devblocksize; { daddr_t r_lblkno; off_t f_offset; int size_of_prefetch; int max_pages; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_START, b_lblkno, e_lblkno, vp->v_lastr, 0, 0); if (b_lblkno == vp->v_lastr && b_lblkno == e_lblkno) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_END, vp->v_ralen, vp->v_maxra, vp->v_lastr, 0, 0); return; } if (vp->v_lastr == -1 || (b_lblkno != vp->v_lastr && b_lblkno != (vp->v_lastr + 1) && (b_lblkno != (vp->v_maxra + 1) || vp->v_ralen == 0))) { vp->v_ralen = 0; vp->v_maxra = 0; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_END, vp->v_ralen, vp->v_maxra, vp->v_lastr, 1, 0); return; } max_pages = MAX_UPL_TRANSFER; vp->v_ralen = vp->v_ralen ? min(max_pages, vp->v_ralen << 1) : 1; if (((e_lblkno + 1) - b_lblkno) > vp->v_ralen) vp->v_ralen = min(max_pages, (e_lblkno + 1) - b_lblkno); if (e_lblkno < vp->v_maxra) { if ((vp->v_maxra - e_lblkno) > max(max_pages / 16, 4)) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_END, vp->v_ralen, vp->v_maxra, vp->v_lastr, 2, 0); return; } } r_lblkno = max(e_lblkno, vp->v_maxra) + 1; f_offset = (off_t)r_lblkno * PAGE_SIZE_64; if (f_offset < filesize) { size_of_prefetch = cluster_rd_prefetch(vp, f_offset, vp->v_ralen * PAGE_SIZE, filesize, devblocksize); if (size_of_prefetch) vp->v_maxra = (r_lblkno + size_of_prefetch) - 1; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_END, vp->v_ralen, vp->v_maxra, vp->v_lastr, 3, 0); } int cluster_pageout(vp, upl, upl_offset, f_offset, size, filesize, devblocksize, flags) struct vnode *vp; upl_t upl; vm_offset_t upl_offset; off_t f_offset; int size; off_t filesize; int devblocksize; int flags; { int io_size; int pg_size; off_t max_size; int local_flags = CL_PAGEOUT; if ((flags & UPL_IOSYNC) == 0) local_flags |= CL_ASYNC; if ((flags & UPL_NOCOMMIT) == 0) local_flags |= CL_COMMIT; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 52)) | DBG_FUNC_NONE, (int)f_offset, size, (int)filesize, local_flags, 0); /* * If they didn't specify any I/O, then we are done... * we can't issue an abort because we don't know how * big the upl really is */ if (size <= 0) return (EINVAL); if (vp->v_mount->mnt_flag & MNT_RDONLY) { if (local_flags & CL_COMMIT) ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY); return (EROFS); } /* * can't page-in from a negative offset * or if we're starting beyond the EOF * or if the file offset isn't page aligned * or the size requested isn't a multiple of PAGE_SIZE */ if (f_offset < 0 || f_offset >= filesize || (f_offset & PAGE_MASK_64) || (size & PAGE_MASK)) { if (local_flags & CL_COMMIT) ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY); return (EINVAL); } max_size = filesize - f_offset; if (size < max_size) io_size = size; else io_size = max_size; pg_size = (io_size + (PAGE_SIZE - 1)) & ~PAGE_MASK; if (size > pg_size) { if (local_flags & CL_COMMIT) ubc_upl_abort_range(upl, upl_offset + pg_size, size - pg_size, UPL_ABORT_FREE_ON_EMPTY); } while (vp->v_numoutput >= ASYNC_THROTTLE) { vp->v_flag |= VTHROTTLED; tsleep((caddr_t)&vp->v_numoutput, PRIBIO + 1, "cluster_pageout", 0); } return (cluster_io(vp, upl, upl_offset, f_offset, io_size, devblocksize, local_flags, (struct buf *)0, (struct clios *)0)); } int cluster_pagein(vp, upl, upl_offset, f_offset, size, filesize, devblocksize, flags) struct vnode *vp; upl_t upl; vm_offset_t upl_offset; off_t f_offset; int size; off_t filesize; int devblocksize; int flags; { u_int io_size; int rounded_size; off_t max_size; int retval; int local_flags = 0; if (upl == NULL || size < 0) panic("cluster_pagein: NULL upl passed in"); if ((flags & UPL_IOSYNC) == 0) local_flags |= CL_ASYNC; if ((flags & UPL_NOCOMMIT) == 0) local_flags |= CL_COMMIT; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 56)) | DBG_FUNC_NONE, (int)f_offset, size, (int)filesize, local_flags, 0); /* * can't page-in from a negative offset * or if we're starting beyond the EOF * or if the file offset isn't page aligned * or the size requested isn't a multiple of PAGE_SIZE */ if (f_offset < 0 || f_offset >= filesize || (f_offset & PAGE_MASK_64) || (size & PAGE_MASK) || (upl_offset & PAGE_MASK)) { if (local_flags & CL_COMMIT) ubc_upl_abort_range(upl, upl_offset, size, UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_ERROR); return (EINVAL); } max_size = filesize - f_offset; if (size < max_size) io_size = size; else io_size = max_size; rounded_size = (io_size + (PAGE_SIZE - 1)) & ~PAGE_MASK; if (size > rounded_size && (local_flags & CL_COMMIT)) ubc_upl_abort_range(upl, upl_offset + rounded_size, size - (upl_offset + rounded_size), UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_ERROR); retval = cluster_io(vp, upl, upl_offset, f_offset, io_size, devblocksize, local_flags | CL_READ | CL_PAGEIN, (struct buf *)0, (struct clios *)0); if (retval == 0) { int b_lblkno; int e_lblkno; b_lblkno = (int)(f_offset / PAGE_SIZE_64); e_lblkno = (int) ((f_offset + ((off_t)io_size - 1)) / PAGE_SIZE_64); if (!(flags & UPL_NORDAHEAD) && !(vp->v_flag & VRAOFF) && rounded_size == PAGE_SIZE) { /* * we haven't read the last page in of the file yet * so let's try to read ahead if we're in * a sequential access pattern */ cluster_rd_ahead(vp, b_lblkno, e_lblkno, filesize, devblocksize); } vp->v_lastr = e_lblkno; } return (retval); } int cluster_bp(bp) struct buf *bp; { off_t f_offset; int flags; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 19)) | DBG_FUNC_START, (int)bp, bp->b_lblkno, bp->b_bcount, bp->b_flags, 0); if (bp->b_pagelist == (upl_t) 0) panic("cluster_bp: can't handle NULL upl yet\n"); if (bp->b_flags & B_READ) flags = CL_ASYNC | CL_READ; else flags = CL_ASYNC; f_offset = ubc_blktooff(bp->b_vp, bp->b_lblkno); return (cluster_io(bp->b_vp, bp->b_pagelist, 0, f_offset, bp->b_bcount, 0, flags, bp, (struct clios *)0)); } int cluster_write(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags) struct vnode *vp; struct uio *uio; off_t oldEOF; off_t newEOF; off_t headOff; off_t tailOff; int devblocksize; int flags; { int prev_resid; int clip_size; off_t max_io_size; struct iovec *iov; vm_offset_t upl_offset; int upl_size; int pages_in_pl; upl_page_info_t *pl; int upl_flags; upl_t upl; int retval = 0; if ( (!(vp->v_flag & VNOCACHE_DATA)) || (!uio) || (uio->uio_segflg != UIO_USERSPACE)) { retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags); return(retval); } while (uio->uio_resid && uio->uio_offset < newEOF && retval == 0) { /* we know we have a resid, so this is safe */ iov = uio->uio_iov; while (iov->iov_len == 0) { uio->uio_iov++; uio->uio_iovcnt--; iov = uio->uio_iov; } /* * We check every vector target and if it is physically * contiguous space, we skip the sanity checks. */ upl_offset = (vm_offset_t)iov->iov_base & ~PAGE_MASK; upl_size = (upl_offset + PAGE_SIZE +(PAGE_SIZE -1)) & ~PAGE_MASK; pages_in_pl = 0; upl_flags = UPL_QUERY_OBJECT_TYPE; if ((vm_map_get_upl(current_map(), (vm_offset_t)iov->iov_base & ~PAGE_MASK, &upl_size, &upl, NULL, &pages_in_pl, &upl_flags, 0)) != KERN_SUCCESS) { /* * the user app must have passed in an invalid address */ return (EFAULT); } if (upl_flags & UPL_PHYS_CONTIG) { if (flags & IO_HEADZEROFILL) { flags &= ~IO_HEADZEROFILL; if (retval = cluster_write_x(vp, (struct uio *)0, 0, uio->uio_offset, headOff, 0, devblocksize, IO_HEADZEROFILL)) return(retval); } retval = cluster_phys_write(vp, uio, newEOF, devblocksize, flags); if (uio->uio_resid == 0 && (flags & IO_TAILZEROFILL)) { retval = cluster_write_x(vp, (struct uio *)0, 0, tailOff, uio->uio_offset, 0, devblocksize, IO_HEADZEROFILL); return(retval); } } else if ((uio->uio_resid < 4 * PAGE_SIZE) || (flags & (IO_TAILZEROFILL | IO_HEADZEROFILL))) { /* * We set a threshhold of 4 pages to decide if the nocopy * write loop is worth the trouble... * we also come here if we're trying to zero the head and/or tail * of a partially written page, and the user source is not a physically contiguous region */ retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags); return(retval); } else if (uio->uio_offset & PAGE_MASK_64) { /* Bring the file offset write up to a pagesize boundary */ clip_size = (PAGE_SIZE - (uio->uio_offset & PAGE_MASK_64)); if (uio->uio_resid < clip_size) clip_size = uio->uio_resid; /* * Fake the resid going into the cluster_write_x call * and restore it on the way out. */ prev_resid = uio->uio_resid; uio->uio_resid = clip_size; retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags); uio->uio_resid = prev_resid - (clip_size - uio->uio_resid); } else if ((int)iov->iov_base & PAGE_MASK_64) { clip_size = iov->iov_len; prev_resid = uio->uio_resid; uio->uio_resid = clip_size; retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags); uio->uio_resid = prev_resid - (clip_size - uio->uio_resid); } else { /* * If we come in here, we know the offset into * the file is on a pagesize boundary */ max_io_size = newEOF - uio->uio_offset; clip_size = uio->uio_resid; if (iov->iov_len < clip_size) clip_size = iov->iov_len; if (max_io_size < clip_size) clip_size = max_io_size; if (clip_size < PAGE_SIZE) { /* * Take care of tail end of write in this vector */ prev_resid = uio->uio_resid; uio->uio_resid = clip_size; retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags); uio->uio_resid = prev_resid - (clip_size - uio->uio_resid); } else { /* round clip_size down to a multiple of pagesize */ clip_size = clip_size & ~(PAGE_MASK); prev_resid = uio->uio_resid; uio->uio_resid = clip_size; retval = cluster_nocopy_write(vp, uio, newEOF, devblocksize, flags); if ((retval == 0) && uio->uio_resid) retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags); uio->uio_resid = prev_resid - (clip_size - uio->uio_resid); } } /* end else */ } /* end while */ return(retval); } static int cluster_nocopy_write(vp, uio, newEOF, devblocksize, flags) struct vnode *vp; struct uio *uio; off_t newEOF; int devblocksize; int flags; { upl_t upl; upl_page_info_t *pl; off_t upl_f_offset; vm_offset_t upl_offset; off_t max_io_size; int io_size; int io_flag; int upl_size; int upl_needed_size; int pages_in_pl; int upl_flags; kern_return_t kret; struct iovec *iov; int i; int first = 1; int force_data_sync; int error = 0; struct clios iostate; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 75)) | DBG_FUNC_START, (int)uio->uio_offset, (int)uio->uio_resid, (int)newEOF, devblocksize, 0); /* * When we enter this routine, we know * -- the offset into the file is on a pagesize boundary * -- the resid is a page multiple * -- the resid will not exceed iov_len */ cluster_try_push(vp, newEOF, 0, 1); iostate.io_completed = 0; iostate.io_issued = 0; iostate.io_error = 0; iostate.io_wanted = 0; iov = uio->uio_iov; while (uio->uio_resid && uio->uio_offset < newEOF && error == 0) { io_size = uio->uio_resid; if (io_size > (MAX_UPL_TRANSFER * PAGE_SIZE)) io_size = MAX_UPL_TRANSFER * PAGE_SIZE; if (first) { if (io_size > (MAX_UPL_TRANSFER * PAGE_SIZE) / 4) io_size = (MAX_UPL_TRANSFER * PAGE_SIZE) / 8; first = 0; } upl_offset = (vm_offset_t)iov->iov_base & PAGE_MASK_64; upl_needed_size = (upl_offset + io_size + (PAGE_SIZE -1)) & ~PAGE_MASK; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_START, (int)upl_offset, upl_needed_size, (int)iov->iov_base, io_size, 0); for (force_data_sync = 0; force_data_sync < 3; force_data_sync++) { pages_in_pl = 0; upl_size = upl_needed_size; upl_flags = UPL_FILE_IO | UPL_COPYOUT_FROM | UPL_NO_SYNC | UPL_CLEAN_IN_PLACE | UPL_SET_INTERNAL; kret = vm_map_get_upl(current_map(), (vm_offset_t)iov->iov_base & ~PAGE_MASK, &upl_size, &upl, NULL, &pages_in_pl, &upl_flags, force_data_sync); if (kret != KERN_SUCCESS) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_END, 0, 0, 0, kret, 0); /* * cluster_nocopy_write: failed to get pagelist * * we may have already spun some portion of this request * off as async requests... we need to wait for the I/O * to complete before returning */ goto wait_for_writes; } pl = UPL_GET_INTERNAL_PAGE_LIST(upl); pages_in_pl = upl_size / PAGE_SIZE; for (i = 0; i < pages_in_pl; i++) { if (!upl_valid_page(pl, i)) break; } if (i == pages_in_pl) break; /* * didn't get all the pages back that we * needed... release this upl and try again */ ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size, UPL_ABORT_FREE_ON_EMPTY); } if (force_data_sync >= 3) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_END, i, pages_in_pl, upl_size, kret, 0); /* * for some reason, we couldn't acquire a hold on all * the pages needed in the user's address space * * we may have already spun some portion of this request * off as async requests... we need to wait for the I/O * to complete before returning */ goto wait_for_writes; } /* * Consider the possibility that upl_size wasn't satisfied. */ if (upl_size != upl_needed_size) io_size = (upl_size - (int)upl_offset) & ~PAGE_MASK; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_END, (int)upl_offset, upl_size, (int)iov->iov_base, io_size, 0); if (io_size == 0) { ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size, UPL_ABORT_FREE_ON_EMPTY); /* * we may have already spun some portion of this request * off as async requests... we need to wait for the I/O * to complete before returning */ goto wait_for_writes; } /* * Now look for pages already in the cache * and throw them away. */ upl_f_offset = uio->uio_offset; /* this is page aligned in the file */ max_io_size = io_size; while (max_io_size) { /* * Flag UPL_POP_DUMP says if the page is found * in the page cache it must be thrown away. */ ubc_page_op(vp, upl_f_offset, UPL_POP_SET | UPL_POP_BUSY | UPL_POP_DUMP, 0, 0); max_io_size -= PAGE_SIZE_64; upl_f_offset += PAGE_SIZE_64; } /* * we want push out these writes asynchronously so that we can overlap * the preparation of the next I/O * if there are already too many outstanding writes * wait until some complete before issuing the next */ while ((iostate.io_issued - iostate.io_completed) > (2 * MAX_UPL_TRANSFER * PAGE_SIZE)) { iostate.io_wanted = 1; tsleep((caddr_t)&iostate.io_wanted, PRIBIO + 1, "cluster_nocopy_write", 0); } if (iostate.io_error) { /* * one of the earlier writes we issued ran into a hard error * don't issue any more writes, cleanup the UPL * that was just created but not used, then * go wait for all writes that are part of this stream * to complete before returning the error to the caller */ ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size, UPL_ABORT_FREE_ON_EMPTY); goto wait_for_writes; } io_flag = CL_ASYNC | CL_PRESERVE | CL_COMMIT; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 77)) | DBG_FUNC_START, (int)upl_offset, (int)uio->uio_offset, io_size, io_flag, 0); error = cluster_io(vp, upl, upl_offset, uio->uio_offset, io_size, devblocksize, io_flag, (struct buf *)0, &iostate); iov->iov_len -= io_size; iov->iov_base += io_size; uio->uio_resid -= io_size; uio->uio_offset += io_size; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 77)) | DBG_FUNC_END, (int)upl_offset, (int)uio->uio_offset, (int)uio->uio_resid, error, 0); } /* end while */ wait_for_writes: /* * make sure all async writes issued as part of this stream * have completed before we return */ while (iostate.io_issued != iostate.io_completed) { iostate.io_wanted = 1; tsleep((caddr_t)&iostate.io_wanted, PRIBIO + 1, "cluster_nocopy_write", 0); } if (iostate.io_error) error = iostate.io_error; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 75)) | DBG_FUNC_END, (int)uio->uio_offset, (int)uio->uio_resid, error, 4, 0); return (error); } static int cluster_phys_write(vp, uio, newEOF, devblocksize, flags) struct vnode *vp; struct uio *uio; off_t newEOF; int devblocksize; int flags; { upl_page_info_t *pl; vm_offset_t src_paddr; upl_t upl; vm_offset_t upl_offset; int tail_size; int io_size; int upl_size; int upl_needed_size; int pages_in_pl; int upl_flags; kern_return_t kret; struct iovec *iov; int error = 0; /* * When we enter this routine, we know * -- the resid will not exceed iov_len * -- the vector target address is physcially contiguous */ cluster_try_push(vp, newEOF, 0, 1); iov = uio->uio_iov; io_size = iov->iov_len; upl_offset = (vm_offset_t)iov->iov_base & PAGE_MASK_64; upl_needed_size = upl_offset + io_size; pages_in_pl = 0; upl_size = upl_needed_size; upl_flags = UPL_FILE_IO | UPL_COPYOUT_FROM | UPL_NO_SYNC | UPL_CLEAN_IN_PLACE | UPL_SET_INTERNAL; kret = vm_map_get_upl(current_map(), (vm_offset_t)iov->iov_base & ~PAGE_MASK, &upl_size, &upl, NULL, &pages_in_pl, &upl_flags, 0); if (kret != KERN_SUCCESS) { /* * cluster_phys_write: failed to get pagelist * note: return kret here */ return(EINVAL); } /* * Consider the possibility that upl_size wasn't satisfied. * This is a failure in the physical memory case. */ if (upl_size < upl_needed_size) { kernel_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); return(EINVAL); } pl = ubc_upl_pageinfo(upl); src_paddr = (vm_offset_t)upl_phys_page(pl, 0) + ((vm_offset_t)iov->iov_base & PAGE_MASK); while (((uio->uio_offset & (devblocksize - 1)) || io_size < devblocksize) && io_size) { int head_size; head_size = devblocksize - (int)(uio->uio_offset & (devblocksize - 1)); if (head_size > io_size) head_size = io_size; error = cluster_align_phys_io(vp, uio, src_paddr, head_size, devblocksize, 0); if (error) { ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); return(EINVAL); } upl_offset += head_size; src_paddr += head_size; io_size -= head_size; } tail_size = io_size & (devblocksize - 1); io_size -= tail_size; if (io_size) { /* * issue a synchronous write to cluster_io */ error = cluster_io(vp, upl, upl_offset, uio->uio_offset, io_size, 0, CL_DEV_MEMORY, (struct buf *)0, (struct clios *)0); } if (error == 0) { /* * The cluster_io write completed successfully, * update the uio structure */ uio->uio_resid -= io_size; iov->iov_len -= io_size; iov->iov_base += io_size; uio->uio_offset += io_size; src_paddr += io_size; if (tail_size) error = cluster_align_phys_io(vp, uio, src_paddr, tail_size, devblocksize, 0); } /* * just release our hold on the physically contiguous * region without changing any state */ ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); return (error); } static int cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, devblocksize, flags) struct vnode *vp; struct uio *uio; off_t oldEOF; off_t newEOF; off_t headOff; off_t tailOff; int devblocksize; int flags; { upl_page_info_t *pl; upl_t upl; vm_offset_t upl_offset; int upl_size; off_t upl_f_offset; int pages_in_upl; int start_offset; int xfer_resid; int io_size; int io_flags; vm_offset_t io_address; int io_offset; int bytes_to_zero; int bytes_to_move; kern_return_t kret; int retval = 0; int uio_resid; long long total_size; long long zero_cnt; off_t zero_off; long long zero_cnt1; off_t zero_off1; daddr_t start_blkno; daddr_t last_blkno; if (uio) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 40)) | DBG_FUNC_START, (int)uio->uio_offset, uio->uio_resid, (int)oldEOF, (int)newEOF, 0); uio_resid = uio->uio_resid; } else { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 40)) | DBG_FUNC_START, 0, 0, (int)oldEOF, (int)newEOF, 0); uio_resid = 0; } zero_cnt = 0; zero_cnt1 = 0; if (flags & IO_HEADZEROFILL) { /* * some filesystems (HFS is one) don't support unallocated holes within a file... * so we zero fill the intervening space between the old EOF and the offset * where the next chunk of real data begins.... ftruncate will also use this * routine to zero fill to the new EOF when growing a file... in this case, the * uio structure will not be provided */ if (uio) { if (headOff < uio->uio_offset) { zero_cnt = uio->uio_offset - headOff; zero_off = headOff; } } else if (headOff < newEOF) { zero_cnt = newEOF - headOff; zero_off = headOff; } } if (flags & IO_TAILZEROFILL) { if (uio) { zero_off1 = uio->uio_offset + uio->uio_resid; if (zero_off1 < tailOff) zero_cnt1 = tailOff - zero_off1; } } if (zero_cnt == 0 && uio == (struct uio *) 0) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 40)) | DBG_FUNC_END, retval, 0, 0, 0, 0); return (0); } while ((total_size = (uio_resid + zero_cnt + zero_cnt1)) && retval == 0) { /* * for this iteration of the loop, figure out where our starting point is */ if (zero_cnt) { start_offset = (int)(zero_off & PAGE_MASK_64); upl_f_offset = zero_off - start_offset; } else if (uio_resid) { start_offset = (int)(uio->uio_offset & PAGE_MASK_64); upl_f_offset = uio->uio_offset - start_offset; } else { start_offset = (int)(zero_off1 & PAGE_MASK_64); upl_f_offset = zero_off1 - start_offset; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 46)) | DBG_FUNC_NONE, (int)zero_off, (int)zero_cnt, (int)zero_off1, (int)zero_cnt1, 0); if (total_size > (MAX_UPL_TRANSFER * PAGE_SIZE)) total_size = MAX_UPL_TRANSFER * PAGE_SIZE; /* * compute the size of the upl needed to encompass * the requested write... limit each call to cluster_io * to the maximum UPL size... cluster_io will clip if * this exceeds the maximum io_size for the device, * make sure to account for * a starting offset that's not page aligned */ upl_size = (start_offset + total_size + (PAGE_SIZE - 1)) & ~PAGE_MASK; if (upl_size > (MAX_UPL_TRANSFER * PAGE_SIZE)) upl_size = MAX_UPL_TRANSFER * PAGE_SIZE; pages_in_upl = upl_size / PAGE_SIZE; io_size = upl_size - start_offset; if ((long long)io_size > total_size) io_size = total_size; start_blkno = (daddr_t)(upl_f_offset / PAGE_SIZE_64); last_blkno = start_blkno + pages_in_upl; kret = ubc_create_upl(vp, upl_f_offset, upl_size, &upl, &pl, UPL_FLAGS_NONE); if (kret != KERN_SUCCESS) panic("cluster_write: failed to get pagelist"); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 41)) | DBG_FUNC_NONE, (int)upl, (int)upl_f_offset, upl_size, start_offset, 0); if (start_offset && !upl_valid_page(pl, 0)) { int read_size; /* * we're starting in the middle of the first page of the upl * and the page isn't currently valid, so we're going to have * to read it in first... this is a synchronous operation */ read_size = PAGE_SIZE; if ((upl_f_offset + read_size) > newEOF) read_size = newEOF - upl_f_offset; retval = cluster_io(vp, upl, 0, upl_f_offset, read_size, devblocksize, CL_READ, (struct buf *)0, (struct clios *)0); if (retval) { /* * we had an error during the read which causes us to abort * the current cluster_write request... before we do, we need * to release the rest of the pages in the upl without modifying * there state and mark the failed page in error */ ubc_upl_abort_range(upl, 0, PAGE_SIZE, UPL_ABORT_DUMP_PAGES); ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 45)) | DBG_FUNC_NONE, (int)upl, 0, 0, retval, 0); break; } } if ((start_offset == 0 || upl_size > PAGE_SIZE) && ((start_offset + io_size) & PAGE_MASK)) { /* * the last offset we're writing to in this upl does not end on a page * boundary... if it's not beyond the old EOF, then we'll also need to * pre-read this page in if it isn't already valid */ upl_offset = upl_size - PAGE_SIZE; if ((upl_f_offset + start_offset + io_size) < oldEOF && !upl_valid_page(pl, upl_offset / PAGE_SIZE)) { int read_size; read_size = PAGE_SIZE; if ((upl_f_offset + upl_offset + read_size) > newEOF) read_size = newEOF - (upl_f_offset + upl_offset); retval = cluster_io(vp, upl, upl_offset, upl_f_offset + upl_offset, read_size, devblocksize, CL_READ, (struct buf *)0, (struct clios *)0); if (retval) { /* * we had an error during the read which causes us to abort * the current cluster_write request... before we do, we * need to release the rest of the pages in the upl without * modifying there state and mark the failed page in error */ ubc_upl_abort_range(upl, upl_offset, PAGE_SIZE, UPL_ABORT_DUMP_PAGES); ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 45)) | DBG_FUNC_NONE, (int)upl, 0, 0, retval, 0); break; } } } if ((kret = ubc_upl_map(upl, &io_address)) != KERN_SUCCESS) panic("cluster_write: ubc_upl_map failed\n"); xfer_resid = io_size; io_offset = start_offset; while (zero_cnt && xfer_resid) { if (zero_cnt < (long long)xfer_resid) bytes_to_zero = zero_cnt; else bytes_to_zero = xfer_resid; if ( !(flags & (IO_NOZEROVALID | IO_NOZERODIRTY))) { bzero((caddr_t)(io_address + io_offset), bytes_to_zero); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 43)) | DBG_FUNC_NONE, (int)upl_f_offset + io_offset, bytes_to_zero, (int)io_offset, xfer_resid, 0); } else { int zero_pg_index; bytes_to_zero = min(bytes_to_zero, PAGE_SIZE - (int)(zero_off & PAGE_MASK_64)); zero_pg_index = (int)((zero_off - upl_f_offset) / PAGE_SIZE_64); if ( !upl_valid_page(pl, zero_pg_index)) { bzero((caddr_t)(io_address + io_offset), bytes_to_zero); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 43)) | DBG_FUNC_NONE, (int)upl_f_offset + io_offset, bytes_to_zero, (int)io_offset, xfer_resid, 0); } else if ((flags & (IO_NOZERODIRTY | IO_NOZEROVALID)) == IO_NOZERODIRTY && !upl_dirty_page(pl, zero_pg_index)) { bzero((caddr_t)(io_address + io_offset), bytes_to_zero); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 43)) | DBG_FUNC_NONE, (int)upl_f_offset + io_offset, bytes_to_zero, (int)io_offset, xfer_resid, 0); } } xfer_resid -= bytes_to_zero; zero_cnt -= bytes_to_zero; zero_off += bytes_to_zero; io_offset += bytes_to_zero; } if (xfer_resid && uio_resid) { bytes_to_move = min(uio_resid, xfer_resid); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 42)) | DBG_FUNC_NONE, (int)uio->uio_offset, bytes_to_move, uio_resid, xfer_resid, 0); retval = uiomove((caddr_t)(io_address + io_offset), bytes_to_move, uio); if (retval) { if ((kret = ubc_upl_unmap(upl)) != KERN_SUCCESS) panic("cluster_write: kernel_upl_unmap failed\n"); ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 45)) | DBG_FUNC_NONE, (int)upl, 0, 0, retval, 0); } else { uio_resid -= bytes_to_move; xfer_resid -= bytes_to_move; io_offset += bytes_to_move; } } while (xfer_resid && zero_cnt1 && retval == 0) { if (zero_cnt1 < (long long)xfer_resid) bytes_to_zero = zero_cnt1; else bytes_to_zero = xfer_resid; if ( !(flags & (IO_NOZEROVALID | IO_NOZERODIRTY))) { bzero((caddr_t)(io_address + io_offset), bytes_to_zero); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 43)) | DBG_FUNC_NONE, (int)upl_f_offset + io_offset, bytes_to_zero, (int)io_offset, xfer_resid, 0); } else { int zero_pg_index; bytes_to_zero = min(bytes_to_zero, PAGE_SIZE - (int)(zero_off1 & PAGE_MASK_64)); zero_pg_index = (int)((zero_off1 - upl_f_offset) / PAGE_SIZE_64); if ( !upl_valid_page(pl, zero_pg_index)) { bzero((caddr_t)(io_address + io_offset), bytes_to_zero); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 43)) | DBG_FUNC_NONE, (int)upl_f_offset + io_offset, bytes_to_zero, (int)io_offset, xfer_resid, 0); } else if ((flags & (IO_NOZERODIRTY | IO_NOZEROVALID)) == IO_NOZERODIRTY && !upl_dirty_page(pl, zero_pg_index)) { bzero((caddr_t)(io_address + io_offset), bytes_to_zero); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 43)) | DBG_FUNC_NONE, (int)upl_f_offset + io_offset, bytes_to_zero, (int)io_offset, xfer_resid, 0); } } xfer_resid -= bytes_to_zero; zero_cnt1 -= bytes_to_zero; zero_off1 += bytes_to_zero; io_offset += bytes_to_zero; } if (retval == 0) { int cl_index; int can_delay; io_size += start_offset; if ((upl_f_offset + io_size) >= newEOF && io_size < upl_size) { /* * if we're extending the file with this write * we'll zero fill the rest of the page so that * if the file gets extended again in such a way as to leave a * hole starting at this EOF, we'll have zero's in the correct spot */ bzero((caddr_t)(io_address + io_size), upl_size - io_size); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 43)) | DBG_FUNC_NONE, (int)upl_f_offset + io_size, upl_size - io_size, 0, 0, 0); } if ((kret = ubc_upl_unmap(upl)) != KERN_SUCCESS) panic("cluster_write: kernel_upl_unmap failed\n"); if (flags & IO_SYNC) /* * if the IO_SYNC flag is set than we need to * bypass any clusters and immediately issue * the I/O */ goto issue_io; if (vp->v_clen == 0) /* * no clusters currently present */ goto start_new_cluster; /* * keep track of the overall dirty page * range we've developed * in case we have to fall back to the * VHASDIRTY method of flushing */ if (vp->v_flag & VHASDIRTY) goto delay_io; for (cl_index = 0; cl_index < vp->v_clen; cl_index++) { /* * we have an existing cluster... see if this write will extend it nicely */ if (start_blkno >= vp->v_clusters[cl_index].start_pg) { /* * the current write starts at or after the current cluster */ if (last_blkno <= (vp->v_clusters[cl_index].start_pg + MAX_UPL_TRANSFER)) { /* * we have a write that fits entirely * within the existing cluster limits */ if (last_blkno > vp->v_clusters[cl_index].last_pg) /* * update our idea of where the cluster ends */ vp->v_clusters[cl_index].last_pg = last_blkno; break; } if (start_blkno < (vp->v_clusters[cl_index].start_pg + MAX_UPL_TRANSFER)) { /* * we have a write that starts in the middle of the current cluster * but extends beyond the cluster's limit * we'll clip the current cluster if we actually * overlap with the new write * and start a new cluster with the current write */ if (vp->v_clusters[cl_index].last_pg > start_blkno) vp->v_clusters[cl_index].last_pg = start_blkno; } /* * we also get here for the case where the current write starts * beyond the limit of the existing cluster * * in either case, we'll check the remaining clusters before * starting a new one */ } else { /* * the current write starts in front of the current cluster */ if ((vp->v_clusters[cl_index].last_pg - start_blkno) <= MAX_UPL_TRANSFER) { /* * we can just merge the old cluster * with the new request and leave it * in the cache */ vp->v_clusters[cl_index].start_pg = start_blkno; if (last_blkno > vp->v_clusters[cl_index].last_pg) { /* * the current write completely * envelops the existing cluster */ vp->v_clusters[cl_index].last_pg = last_blkno; } break; } /* * if we were to combine this write with the current cluster * we would exceed the cluster size limit.... so, * let's see if there's any overlap of the new I/O with * the existing cluster... * */ if (last_blkno > vp->v_clusters[cl_index].start_pg) /* * the current write extends into the existing cluster * clip the current cluster by moving the start position * to where the current write ends */ vp->v_clusters[cl_index].start_pg = last_blkno; /* * if we get here, there was no way to merge * the new I/O with this cluster and * keep it under our maximum cluster length * we'll check the remaining clusters before starting a new one */ } } if (cl_index < vp->v_clen) /* * we found an existing cluster that we * could merger this I/O into */ goto delay_io; if (vp->v_clen < MAX_CLUSTERS && !(vp->v_flag & VNOCACHE_DATA)) /* * we didn't find an existing cluster to * merge into, but there's room to start * a new one */ goto start_new_cluster; /* * no exisitng cluster to merge with and no * room to start a new one... we'll try * pushing the existing ones... if none of * them are able to be pushed, we'll have * to fall back on the VHASDIRTY mechanism * cluster_try_push will set v_clen to the * number of remaining clusters if it is * unable to push all of them */ if (vp->v_flag & VNOCACHE_DATA) can_delay = 0; else can_delay = 1; if (cluster_try_push(vp, newEOF, 0, 0) == 0) { vp->v_flag |= VHASDIRTY; goto delay_io; } start_new_cluster: if (vp->v_clen == 0) { vp->v_ciosiz = devblocksize; vp->v_cstart = start_blkno; vp->v_lastw = last_blkno; } vp->v_clusters[vp->v_clen].start_pg = start_blkno; vp->v_clusters[vp->v_clen].last_pg = last_blkno; vp->v_clen++; delay_io: /* * make sure we keep v_cstart and v_lastw up to * date in case we have to fall back on the * V_HASDIRTY mechanism (or we've already entered it) */ if (start_blkno < vp->v_cstart) vp->v_cstart = start_blkno; if (last_blkno > vp->v_lastw) vp->v_lastw = last_blkno; ubc_upl_commit_range(upl, 0, upl_size, UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY); continue; issue_io: /* * in order to maintain some semblance of coherency with mapped writes * we need to write the cluster back out as a multiple of the PAGESIZE * unless the cluster encompasses the last page of the file... in this * case we'll round out to the nearest device block boundary */ io_size = upl_size; if ((upl_f_offset + io_size) > newEOF) { io_size = newEOF - upl_f_offset; io_size = (io_size + (devblocksize - 1)) & ~(devblocksize - 1); } if (flags & IO_SYNC) io_flags = CL_COMMIT | CL_AGE; else io_flags = CL_COMMIT | CL_AGE | CL_ASYNC; if (vp->v_flag & VNOCACHE_DATA) io_flags |= CL_DUMP; while (vp->v_numoutput >= ASYNC_THROTTLE) { vp->v_flag |= VTHROTTLED; tsleep((caddr_t)&vp->v_numoutput, PRIBIO + 1, "cluster_write", 0); } retval = cluster_io(vp, upl, 0, upl_f_offset, io_size, devblocksize, io_flags, (struct buf *)0, (struct clios *)0); } } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 40)) | DBG_FUNC_END, retval, 0, 0, 0, 0); return (retval); } int cluster_read(vp, uio, filesize, devblocksize, flags) struct vnode *vp; struct uio *uio; off_t filesize; int devblocksize; int flags; { int prev_resid; int clip_size; off_t max_io_size; struct iovec *iov; vm_offset_t upl_offset; int upl_size; int pages_in_pl; upl_page_info_t *pl; int upl_flags; upl_t upl; int retval = 0; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 32)) | DBG_FUNC_START, (int)uio->uio_offset, uio->uio_resid, (int)filesize, devblocksize, 0); /* * We set a threshhold of 4 pages to decide if the nocopy * read loop is worth the trouble... */ if (!((vp->v_flag & VNOCACHE_DATA) && (uio->uio_segflg == UIO_USERSPACE))) { retval = cluster_read_x(vp, uio, filesize, devblocksize, flags); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 32)) | DBG_FUNC_END, (int)uio->uio_offset, uio->uio_resid, vp->v_lastr, retval, 0); return(retval); } while (uio->uio_resid && uio->uio_offset < filesize && retval == 0) { /* we know we have a resid, so this is safe */ iov = uio->uio_iov; while (iov->iov_len == 0) { uio->uio_iov++; uio->uio_iovcnt--; iov = uio->uio_iov; } /* * We check every vector target and if it is physically * contiguous space, we skip the sanity checks. */ upl_offset = (vm_offset_t)iov->iov_base & ~PAGE_MASK; upl_size = (upl_offset + PAGE_SIZE +(PAGE_SIZE -1)) & ~PAGE_MASK; pages_in_pl = 0; upl_flags = UPL_QUERY_OBJECT_TYPE; if((vm_map_get_upl(current_map(), (vm_offset_t)iov->iov_base & ~PAGE_MASK, &upl_size, &upl, NULL, &pages_in_pl, &upl_flags, 0)) != KERN_SUCCESS) { /* * the user app must have passed in an invalid address */ return (EFAULT); } if (upl_flags & UPL_PHYS_CONTIG) { retval = cluster_phys_read(vp, uio, filesize, devblocksize, flags); } else if (uio->uio_resid < 4 * PAGE_SIZE) { /* * We set a threshhold of 4 pages to decide if the nocopy * read loop is worth the trouble... */ retval = cluster_read_x(vp, uio, filesize, devblocksize, flags); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 32)) | DBG_FUNC_END, (int)uio->uio_offset, uio->uio_resid, vp->v_lastr, retval, 0); return(retval); } else if (uio->uio_offset & PAGE_MASK_64) { /* Bring the file offset read up to a pagesize boundary */ clip_size = (PAGE_SIZE - (int)(uio->uio_offset & PAGE_MASK_64)); if (uio->uio_resid < clip_size) clip_size = uio->uio_resid; /* * Fake the resid going into the cluster_read_x call * and restore it on the way out. */ prev_resid = uio->uio_resid; uio->uio_resid = clip_size; retval = cluster_read_x(vp, uio, filesize, devblocksize, flags); uio->uio_resid = prev_resid - (clip_size - uio->uio_resid); } else if ((int)iov->iov_base & PAGE_MASK_64) { clip_size = iov->iov_len; prev_resid = uio->uio_resid; uio->uio_resid = clip_size; retval = cluster_read_x(vp, uio, filesize, devblocksize, flags); uio->uio_resid = prev_resid - (clip_size - uio->uio_resid); } else { /* * If we come in here, we know the offset into * the file is on a pagesize boundary */ max_io_size = filesize - uio->uio_offset; clip_size = uio->uio_resid; if (iov->iov_len < clip_size) clip_size = iov->iov_len; if (max_io_size < clip_size) clip_size = (int)max_io_size; if (clip_size < PAGE_SIZE) { /* * Take care of the tail end of the read in this vector. */ prev_resid = uio->uio_resid; uio->uio_resid = clip_size; retval = cluster_read_x(vp, uio, filesize, devblocksize, flags); uio->uio_resid = prev_resid - (clip_size - uio->uio_resid); } else { /* round clip_size down to a multiple of pagesize */ clip_size = clip_size & ~(PAGE_MASK); prev_resid = uio->uio_resid; uio->uio_resid = clip_size; retval = cluster_nocopy_read(vp, uio, filesize, devblocksize, flags); if ((retval==0) && uio->uio_resid) retval = cluster_read_x(vp, uio, filesize, devblocksize, flags); uio->uio_resid = prev_resid - (clip_size - uio->uio_resid); } } /* end else */ } /* end while */ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 32)) | DBG_FUNC_END, (int)uio->uio_offset, uio->uio_resid, vp->v_lastr, retval, 0); return(retval); } static int cluster_read_x(vp, uio, filesize, devblocksize, flags) struct vnode *vp; struct uio *uio; off_t filesize; int devblocksize; int flags; { upl_page_info_t *pl; upl_t upl; vm_offset_t upl_offset; int upl_size; off_t upl_f_offset; int start_offset; int start_pg; int last_pg; int uio_last; int pages_in_upl; off_t max_size; int io_size; vm_offset_t io_address; kern_return_t kret; int segflg; int error = 0; int retval = 0; int b_lblkno; int e_lblkno; b_lblkno = (int)(uio->uio_offset / PAGE_SIZE_64); while (uio->uio_resid && uio->uio_offset < filesize && retval == 0) { /* * compute the size of the upl needed to encompass * the requested read... limit each call to cluster_io * to the maximum UPL size... cluster_io will clip if * this exceeds the maximum io_size for the device, * make sure to account for * a starting offset that's not page aligned */ start_offset = (int)(uio->uio_offset & PAGE_MASK_64); upl_f_offset = uio->uio_offset - (off_t)start_offset; max_size = filesize - uio->uio_offset; if ((off_t)((unsigned int)uio->uio_resid) < max_size) io_size = uio->uio_resid; else io_size = max_size; if (uio->uio_segflg == UIO_USERSPACE && !(vp->v_flag & VNOCACHE_DATA)) { segflg = uio->uio_segflg; uio->uio_segflg = UIO_PHYS_USERSPACE; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_START, (int)uio->uio_offset, io_size, uio->uio_resid, 0, 0); while (io_size && retval == 0) { int xsize; vm_offset_t paddr; if (ubc_page_op(vp, upl_f_offset, UPL_POP_SET | UPL_POP_BUSY, &paddr, 0) != KERN_SUCCESS) break; xsize = PAGE_SIZE - start_offset; if (xsize > io_size) xsize = io_size; retval = uiomove((caddr_t)(paddr + start_offset), xsize, uio); ubc_page_op(vp, upl_f_offset, UPL_POP_CLR | UPL_POP_BUSY, 0, 0); io_size -= xsize; start_offset = (int) (uio->uio_offset & PAGE_MASK_64); upl_f_offset = uio->uio_offset - start_offset; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_END, (int)uio->uio_offset, io_size, uio->uio_resid, 0, 0); uio->uio_segflg = segflg; if (retval) break; if (io_size == 0) { /* * we're already finished with this read request * let's see if we should do a read-ahead */ e_lblkno = (int) ((uio->uio_offset - 1) / PAGE_SIZE_64); if (!(vp->v_flag & VRAOFF)) /* * let's try to read ahead if we're in * a sequential access pattern */ cluster_rd_ahead(vp, b_lblkno, e_lblkno, filesize, devblocksize); vp->v_lastr = e_lblkno; break; } max_size = filesize - uio->uio_offset; } upl_size = (start_offset + io_size + (PAGE_SIZE - 1)) & ~PAGE_MASK; if (upl_size > (MAX_UPL_TRANSFER * PAGE_SIZE)) upl_size = MAX_UPL_TRANSFER * PAGE_SIZE; pages_in_upl = upl_size / PAGE_SIZE; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 33)) | DBG_FUNC_START, (int)upl, (int)upl_f_offset, upl_size, start_offset, 0); kret = ubc_create_upl(vp, upl_f_offset, upl_size, &upl, &pl, UPL_FLAGS_NONE); if (kret != KERN_SUCCESS) panic("cluster_read: failed to get pagelist"); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 33)) | DBG_FUNC_END, (int)upl, (int)upl_f_offset, upl_size, start_offset, 0); /* * scan from the beginning of the upl looking for the first * non-valid page.... this will become the first page in * the request we're going to make to 'cluster_io'... if all * of the pages are valid, we won't call through to 'cluster_io' */ for (start_pg = 0; start_pg < pages_in_upl; start_pg++) { if (!upl_valid_page(pl, start_pg)) break; } /* * scan from the starting invalid page looking for a valid * page before the end of the upl is reached, if we * find one, then it will be the last page of the request to * 'cluster_io' */ for (last_pg = start_pg; last_pg < pages_in_upl; last_pg++) { if (upl_valid_page(pl, last_pg)) break; } if (start_pg < last_pg) { /* * we found a range of 'invalid' pages that must be filled * if the last page in this range is the last page of the file * we may have to clip the size of it to keep from reading past * the end of the last physical block associated with the file */ upl_offset = start_pg * PAGE_SIZE; io_size = (last_pg - start_pg) * PAGE_SIZE; if ((upl_f_offset + upl_offset + io_size) > filesize) io_size = filesize - (upl_f_offset + upl_offset); /* * issue a synchronous read to cluster_io */ error = cluster_io(vp, upl, upl_offset, upl_f_offset + upl_offset, io_size, devblocksize, CL_READ, (struct buf *)0, (struct clios *)0); } if (error == 0) { /* * if the read completed successfully, or there was no I/O request * issued, than map the upl into kernel address space and * move the data into user land.... we'll first add on any 'valid' * pages that were present in the upl when we acquired it. */ u_int val_size; u_int size_of_prefetch; for (uio_last = last_pg; uio_last < pages_in_upl; uio_last++) { if (!upl_valid_page(pl, uio_last)) break; } /* * compute size to transfer this round, if uio->uio_resid is * still non-zero after this uiomove, we'll loop around and * set up for another I/O. */ val_size = (uio_last * PAGE_SIZE) - start_offset; if (max_size < val_size) val_size = max_size; if (uio->uio_resid < val_size) val_size = uio->uio_resid; e_lblkno = (int)((uio->uio_offset + ((off_t)val_size - 1)) / PAGE_SIZE_64); if (size_of_prefetch = (uio->uio_resid - val_size)) { /* * if there's still I/O left to do for this request, then issue a * pre-fetch I/O... the I/O wait time will overlap * with the copying of the data */ cluster_rd_prefetch(vp, uio->uio_offset + val_size, size_of_prefetch, filesize, devblocksize); } else { if (!(vp->v_flag & VRAOFF) && !(vp->v_flag & VNOCACHE_DATA)) /* * let's try to read ahead if we're in * a sequential access pattern */ cluster_rd_ahead(vp, b_lblkno, e_lblkno, filesize, devblocksize); vp->v_lastr = e_lblkno; } if (uio->uio_segflg == UIO_USERSPACE) { int offset; segflg = uio->uio_segflg; uio->uio_segflg = UIO_PHYS_USERSPACE; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_START, (int)uio->uio_offset, val_size, uio->uio_resid, 0, 0); offset = start_offset; while (val_size && retval == 0) { int csize; int i; caddr_t paddr; i = offset / PAGE_SIZE; csize = min(PAGE_SIZE - start_offset, val_size); paddr = (caddr_t)upl_phys_page(pl, i) + start_offset; retval = uiomove(paddr, csize, uio); val_size -= csize; offset += csize; start_offset = offset & PAGE_MASK; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_END, (int)uio->uio_offset, val_size, uio->uio_resid, 0, 0); uio->uio_segflg = segflg; } else { if ((kret = ubc_upl_map(upl, &io_address)) != KERN_SUCCESS) panic("cluster_read: ubc_upl_map() failed\n"); retval = uiomove((caddr_t)(io_address + start_offset), val_size, uio); if ((kret = ubc_upl_unmap(upl)) != KERN_SUCCESS) panic("cluster_read: ubc_upl_unmap() failed\n"); } } if (start_pg < last_pg) { /* * compute the range of pages that we actually issued an I/O for * and either commit them as valid if the I/O succeeded * or abort them if the I/O failed */ io_size = (last_pg - start_pg) * PAGE_SIZE; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 35)) | DBG_FUNC_START, (int)upl, start_pg * PAGE_SIZE, io_size, error, 0); if (error || (vp->v_flag & VNOCACHE_DATA)) ubc_upl_abort_range(upl, start_pg * PAGE_SIZE, io_size, UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY); else ubc_upl_commit_range(upl, start_pg * PAGE_SIZE, io_size, UPL_COMMIT_CLEAR_DIRTY | UPL_COMMIT_FREE_ON_EMPTY | UPL_COMMIT_INACTIVATE); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 35)) | DBG_FUNC_END, (int)upl, start_pg * PAGE_SIZE, io_size, error, 0); } if ((last_pg - start_pg) < pages_in_upl) { int cur_pg; int commit_flags; /* * the set of pages that we issued an I/O for did not encompass * the entire upl... so just release these without modifying * there state */ if (error) ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); else { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 35)) | DBG_FUNC_START, (int)upl, -1, pages_in_upl - (last_pg - start_pg), 0, 0); if (start_pg) { /* * we found some already valid pages at the beginning of * the upl commit these back to the inactive list with * reference cleared */ for (cur_pg = 0; cur_pg < start_pg; cur_pg++) { commit_flags = UPL_COMMIT_FREE_ON_EMPTY | UPL_COMMIT_INACTIVATE; if (upl_dirty_page(pl, cur_pg)) commit_flags |= UPL_COMMIT_SET_DIRTY; if ( !(commit_flags & UPL_COMMIT_SET_DIRTY) && (vp->v_flag & VNOCACHE_DATA)) ubc_upl_abort_range(upl, cur_pg * PAGE_SIZE, PAGE_SIZE, UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY); else ubc_upl_commit_range(upl, cur_pg * PAGE_SIZE, PAGE_SIZE, commit_flags); } } if (last_pg < uio_last) { /* * we found some already valid pages immediately after the * pages we issued I/O for, commit these back to the * inactive list with reference cleared */ for (cur_pg = last_pg; cur_pg < uio_last; cur_pg++) { commit_flags = UPL_COMMIT_FREE_ON_EMPTY | UPL_COMMIT_INACTIVATE; if (upl_dirty_page(pl, cur_pg)) commit_flags |= UPL_COMMIT_SET_DIRTY; if ( !(commit_flags & UPL_COMMIT_SET_DIRTY) && (vp->v_flag & VNOCACHE_DATA)) ubc_upl_abort_range(upl, cur_pg * PAGE_SIZE, PAGE_SIZE, UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY); else ubc_upl_commit_range(upl, cur_pg * PAGE_SIZE, PAGE_SIZE, commit_flags); } } if (uio_last < pages_in_upl) { /* * there were some invalid pages beyond the valid pages * that we didn't issue an I/O for, just release them * unchanged */ ubc_upl_abort_range(upl, uio_last * PAGE_SIZE, (pages_in_upl - uio_last) * PAGE_SIZE, UPL_ABORT_FREE_ON_EMPTY); } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 35)) | DBG_FUNC_END, (int)upl, -1, -1, 0, 0); } } if (retval == 0) retval = error; } return (retval); } static int cluster_nocopy_read(vp, uio, filesize, devblocksize, flags) struct vnode *vp; struct uio *uio; off_t filesize; int devblocksize; int flags; { upl_t upl; upl_page_info_t *pl; off_t upl_f_offset; vm_offset_t upl_offset; off_t start_upl_f_offset; off_t max_io_size; int io_size; int upl_size; int upl_needed_size; int pages_in_pl; vm_offset_t paddr; int upl_flags; kern_return_t kret; int segflg; struct iovec *iov; int i; int force_data_sync; int retval = 0; int first = 1; struct clios iostate; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 70)) | DBG_FUNC_START, (int)uio->uio_offset, uio->uio_resid, (int)filesize, devblocksize, 0); /* * When we enter this routine, we know * -- the offset into the file is on a pagesize boundary * -- the resid is a page multiple * -- the resid will not exceed iov_len */ iostate.io_completed = 0; iostate.io_issued = 0; iostate.io_error = 0; iostate.io_wanted = 0; iov = uio->uio_iov; while (uio->uio_resid && uio->uio_offset < filesize && retval == 0) { max_io_size = filesize - uio->uio_offset; if (max_io_size < (off_t)((unsigned int)uio->uio_resid)) io_size = max_io_size; else io_size = uio->uio_resid; /* * We don't come into this routine unless * UIO_USERSPACE is set. */ segflg = uio->uio_segflg; uio->uio_segflg = UIO_PHYS_USERSPACE; /* * First look for pages already in the cache * and move them to user space. */ while (io_size && (retval == 0)) { upl_f_offset = uio->uio_offset; /* * If this call fails, it means the page is not * in the page cache. */ if (ubc_page_op(vp, upl_f_offset, UPL_POP_SET | UPL_POP_BUSY, &paddr, 0) != KERN_SUCCESS) break; retval = uiomove((caddr_t)(paddr), PAGE_SIZE, uio); ubc_page_op(vp, upl_f_offset, UPL_POP_CLR | UPL_POP_BUSY, 0, 0); io_size -= PAGE_SIZE; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 71)) | DBG_FUNC_NONE, (int)uio->uio_offset, io_size, uio->uio_resid, 0, 0); } uio->uio_segflg = segflg; if (retval) { /* * we may have already spun some portion of this request * off as async requests... we need to wait for the I/O * to complete before returning */ goto wait_for_reads; } /* * If we are already finished with this read, then return */ if (io_size == 0) { /* * we may have already spun some portion of this request * off as async requests... we need to wait for the I/O * to complete before returning */ goto wait_for_reads; } max_io_size = io_size; if (max_io_size > (MAX_UPL_TRANSFER * PAGE_SIZE)) max_io_size = MAX_UPL_TRANSFER * PAGE_SIZE; if (first) { if (max_io_size > (MAX_UPL_TRANSFER * PAGE_SIZE) / 4) max_io_size = (MAX_UPL_TRANSFER * PAGE_SIZE) / 8; first = 0; } start_upl_f_offset = uio->uio_offset; /* this is page aligned in the file */ upl_f_offset = start_upl_f_offset; io_size = 0; while (io_size < max_io_size) { if (ubc_page_op(vp, upl_f_offset, UPL_POP_SET | UPL_POP_BUSY, &paddr, 0) == KERN_SUCCESS) { ubc_page_op(vp, upl_f_offset, UPL_POP_CLR | UPL_POP_BUSY, 0, 0); break; } /* * Build up the io request parameters. */ io_size += PAGE_SIZE_64; upl_f_offset += PAGE_SIZE_64; } if (io_size == 0) /* * we may have already spun some portion of this request * off as async requests... we need to wait for the I/O * to complete before returning */ goto wait_for_reads; upl_offset = (vm_offset_t)iov->iov_base & PAGE_MASK_64; upl_needed_size = (upl_offset + io_size + (PAGE_SIZE -1)) & ~PAGE_MASK; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 72)) | DBG_FUNC_START, (int)upl_offset, upl_needed_size, (int)iov->iov_base, io_size, 0); for (force_data_sync = 0; force_data_sync < 3; force_data_sync++) { pages_in_pl = 0; upl_size = upl_needed_size; upl_flags = UPL_FILE_IO | UPL_NO_SYNC | UPL_CLEAN_IN_PLACE | UPL_SET_INTERNAL; kret = vm_map_get_upl(current_map(), (vm_offset_t)iov->iov_base & ~PAGE_MASK, &upl_size, &upl, NULL, &pages_in_pl, &upl_flags, force_data_sync); if (kret != KERN_SUCCESS) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 72)) | DBG_FUNC_END, (int)upl_offset, upl_size, io_size, kret, 0); /* * cluster_nocopy_read: failed to get pagelist * * we may have already spun some portion of this request * off as async requests... we need to wait for the I/O * to complete before returning */ goto wait_for_reads; } pages_in_pl = upl_size / PAGE_SIZE; pl = UPL_GET_INTERNAL_PAGE_LIST(upl); for (i = 0; i < pages_in_pl; i++) { if (!upl_valid_page(pl, i)) break; } if (i == pages_in_pl) break; ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size, UPL_ABORT_FREE_ON_EMPTY); } if (force_data_sync >= 3) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 72)) | DBG_FUNC_END, (int)upl_offset, upl_size, io_size, kret, 0); goto wait_for_reads; } /* * Consider the possibility that upl_size wasn't satisfied. */ if (upl_size != upl_needed_size) io_size = (upl_size - (int)upl_offset) & ~PAGE_MASK; if (io_size == 0) { ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size, UPL_ABORT_FREE_ON_EMPTY); goto wait_for_reads; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 72)) | DBG_FUNC_END, (int)upl_offset, upl_size, io_size, kret, 0); /* * request asynchronously so that we can overlap * the preparation of the next I/O * if there are already too many outstanding reads * wait until some have completed before issuing the next read */ while ((iostate.io_issued - iostate.io_completed) > (2 * MAX_UPL_TRANSFER * PAGE_SIZE)) { iostate.io_wanted = 1; tsleep((caddr_t)&iostate.io_wanted, PRIBIO + 1, "cluster_nocopy_read", 0); } if (iostate.io_error) { /* * one of the earlier reads we issued ran into a hard error * don't issue any more reads, cleanup the UPL * that was just created but not used, then * go wait for any other reads to complete before * returning the error to the caller */ ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size, UPL_ABORT_FREE_ON_EMPTY); goto wait_for_reads; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 73)) | DBG_FUNC_START, (int)upl, (int)upl_offset, (int)start_upl_f_offset, io_size, 0); retval = cluster_io(vp, upl, upl_offset, start_upl_f_offset, io_size, devblocksize, CL_PRESERVE | CL_COMMIT | CL_READ | CL_ASYNC | CL_NOZERO, (struct buf *)0, &iostate); /* * update the uio structure */ iov->iov_base += io_size; iov->iov_len -= io_size; uio->uio_resid -= io_size; uio->uio_offset += io_size; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 73)) | DBG_FUNC_END, (int)upl, (int)uio->uio_offset, (int)uio->uio_resid, retval, 0); } /* end while */ wait_for_reads: /* * make sure all async reads that are part of this stream * have completed before we return */ while (iostate.io_issued != iostate.io_completed) { iostate.io_wanted = 1; tsleep((caddr_t)&iostate.io_wanted, PRIBIO + 1, "cluster_nocopy_read", 0); } if (iostate.io_error) retval = iostate.io_error; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 70)) | DBG_FUNC_END, (int)uio->uio_offset, (int)uio->uio_resid, 6, retval, 0); return (retval); } static int cluster_phys_read(vp, uio, filesize, devblocksize, flags) struct vnode *vp; struct uio *uio; off_t filesize; int devblocksize; int flags; { upl_page_info_t *pl; upl_t upl; vm_offset_t upl_offset; vm_offset_t dst_paddr; off_t max_size; int io_size; int tail_size; int upl_size; int upl_needed_size; int pages_in_pl; int upl_flags; kern_return_t kret; struct iovec *iov; struct clios iostate; int error; /* * When we enter this routine, we know * -- the resid will not exceed iov_len * -- the target address is physically contiguous */ iov = uio->uio_iov; max_size = filesize - uio->uio_offset; if (max_size > (off_t)((unsigned int)iov->iov_len)) io_size = iov->iov_len; else io_size = max_size; upl_offset = (vm_offset_t)iov->iov_base & PAGE_MASK_64; upl_needed_size = upl_offset + io_size; error = 0; pages_in_pl = 0; upl_size = upl_needed_size; upl_flags = UPL_FILE_IO | UPL_NO_SYNC | UPL_CLEAN_IN_PLACE | UPL_SET_INTERNAL; kret = vm_map_get_upl(current_map(), (vm_offset_t)iov->iov_base & ~PAGE_MASK, &upl_size, &upl, NULL, &pages_in_pl, &upl_flags, 0); if (kret != KERN_SUCCESS) { /* * cluster_phys_read: failed to get pagelist */ return(EINVAL); } if (upl_size < upl_needed_size) { /* * The upl_size wasn't satisfied. */ ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); return(EINVAL); } pl = ubc_upl_pageinfo(upl); dst_paddr = (vm_offset_t)upl_phys_page(pl, 0) + ((vm_offset_t)iov->iov_base & PAGE_MASK); while (((uio->uio_offset & (devblocksize - 1)) || io_size < devblocksize) && io_size) { int head_size; head_size = devblocksize - (int)(uio->uio_offset & (devblocksize - 1)); if (head_size > io_size) head_size = io_size; error = cluster_align_phys_io(vp, uio, dst_paddr, head_size, devblocksize, CL_READ); if (error) { ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); return(EINVAL); } upl_offset += head_size; dst_paddr += head_size; io_size -= head_size; } tail_size = io_size & (devblocksize - 1); io_size -= tail_size; iostate.io_completed = 0; iostate.io_issued = 0; iostate.io_error = 0; iostate.io_wanted = 0; while (io_size && error == 0) { int xsize; if (io_size > (MAX_UPL_TRANSFER * PAGE_SIZE)) xsize = MAX_UPL_TRANSFER * PAGE_SIZE; else xsize = io_size; /* * request asynchronously so that we can overlap * the preparation of the next I/O... we'll do * the commit after all the I/O has completed * since its all issued against the same UPL * if there are already too many outstanding reads * wait until some have completed before issuing the next */ while ((iostate.io_issued - iostate.io_completed) > (2 * MAX_UPL_TRANSFER * PAGE_SIZE)) { iostate.io_wanted = 1; tsleep((caddr_t)&iostate.io_wanted, PRIBIO + 1, "cluster_phys_read", 0); } error = cluster_io(vp, upl, upl_offset, uio->uio_offset, xsize, 0, CL_READ | CL_NOZERO | CL_DEV_MEMORY | CL_ASYNC, (struct buf *)0, &iostate); /* * The cluster_io read was issued successfully, * update the uio structure */ if (error == 0) { uio->uio_resid -= xsize; iov->iov_len -= xsize; iov->iov_base += xsize; uio->uio_offset += xsize; dst_paddr += xsize; upl_offset += xsize; io_size -= xsize; } } /* * make sure all async reads that are part of this stream * have completed before we proceed */ while (iostate.io_issued != iostate.io_completed) { iostate.io_wanted = 1; tsleep((caddr_t)&iostate.io_wanted, PRIBIO + 1, "cluster_phys_read", 0); } if (iostate.io_error) { error = iostate.io_error; } if (error == 0 && tail_size) error = cluster_align_phys_io(vp, uio, dst_paddr, tail_size, devblocksize, CL_READ); /* * just release our hold on the physically contiguous * region without changing any state */ ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); return (error); } /* * generate advisory I/O's in the largest chunks possible * the completed pages will be released into the VM cache */ int advisory_read(vp, filesize, f_offset, resid, devblocksize) struct vnode *vp; off_t filesize; off_t f_offset; int resid; int devblocksize; { upl_page_info_t *pl; upl_t upl; vm_offset_t upl_offset; int upl_size; off_t upl_f_offset; int start_offset; int start_pg; int last_pg; int pages_in_upl; off_t max_size; int io_size; kern_return_t kret; int retval = 0; int issued_io; if (!UBCINFOEXISTS(vp)) return(EINVAL); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 60)) | DBG_FUNC_START, (int)f_offset, resid, (int)filesize, devblocksize, 0); while (resid && f_offset < filesize && retval == 0) { /* * compute the size of the upl needed to encompass * the requested read... limit each call to cluster_io * to the maximum UPL size... cluster_io will clip if * this exceeds the maximum io_size for the device, * make sure to account for * a starting offset that's not page aligned */ start_offset = (int)(f_offset & PAGE_MASK_64); upl_f_offset = f_offset - (off_t)start_offset; max_size = filesize - f_offset; if (resid < max_size) io_size = resid; else io_size = max_size; upl_size = (start_offset + io_size + (PAGE_SIZE - 1)) & ~PAGE_MASK; if (upl_size > (MAX_UPL_TRANSFER * PAGE_SIZE)) upl_size = MAX_UPL_TRANSFER * PAGE_SIZE; pages_in_upl = upl_size / PAGE_SIZE; kret = ubc_create_upl(vp, upl_f_offset, upl_size, &upl, &pl, UPL_RET_ONLY_ABSENT); if (kret != KERN_SUCCESS) return(retval); issued_io = 0; /* * before we start marching forward, we must make sure we end on * a present page, otherwise we will be working with a freed * upl */ for (last_pg = pages_in_upl - 1; last_pg >= 0; last_pg--) { if (upl_page_present(pl, last_pg)) break; } pages_in_upl = last_pg + 1; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 61)) | DBG_FUNC_NONE, (int)upl, (int)upl_f_offset, upl_size, start_offset, 0); for (last_pg = 0; last_pg < pages_in_upl; ) { /* * scan from the beginning of the upl looking for the first * page that is present.... this will become the first page in * the request we're going to make to 'cluster_io'... if all * of the pages are absent, we won't call through to 'cluster_io' */ for (start_pg = last_pg; start_pg < pages_in_upl; start_pg++) { if (upl_page_present(pl, start_pg)) break; } /* * scan from the starting present page looking for an absent * page before the end of the upl is reached, if we * find one, then it will terminate the range of pages being * presented to 'cluster_io' */ for (last_pg = start_pg; last_pg < pages_in_upl; last_pg++) { if (!upl_page_present(pl, last_pg)) break; } if (last_pg > start_pg) { /* * we found a range of pages that must be filled * if the last page in this range is the last page of the file * we may have to clip the size of it to keep from reading past * the end of the last physical block associated with the file */ upl_offset = start_pg * PAGE_SIZE; io_size = (last_pg - start_pg) * PAGE_SIZE; if ((upl_f_offset + upl_offset + io_size) > filesize) io_size = filesize - (upl_f_offset + upl_offset); /* * issue an asynchronous read to cluster_io */ retval = cluster_io(vp, upl, upl_offset, upl_f_offset + upl_offset, io_size, devblocksize, CL_ASYNC | CL_READ | CL_COMMIT | CL_AGE, (struct buf *)0, (struct clios *)0); issued_io = 1; } } if (issued_io == 0) ubc_upl_abort(upl, 0); io_size = upl_size - start_offset; if (io_size > resid) io_size = resid; f_offset += io_size; resid -= io_size; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 60)) | DBG_FUNC_END, (int)f_offset, resid, retval, 0, 0); return(retval); } int cluster_push(vp) struct vnode *vp; { int retval; if (!UBCINFOEXISTS(vp) || vp->v_clen == 0) { vp->v_flag &= ~VHASDIRTY; return(0); } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 53)) | DBG_FUNC_START, vp->v_flag & VHASDIRTY, vp->v_clen, 0, 0, 0); if (vp->v_flag & VHASDIRTY) { daddr_t start_pg; daddr_t last_pg; daddr_t end_pg; start_pg = vp->v_cstart; end_pg = vp->v_lastw; vp->v_flag &= ~VHASDIRTY; vp->v_clen = 0; while (start_pg < end_pg) { last_pg = start_pg + MAX_UPL_TRANSFER; if (last_pg > end_pg) last_pg = end_pg; cluster_push_x(vp, ubc_getsize(vp), start_pg, last_pg, 0); start_pg = last_pg; } return (1); } retval = cluster_try_push(vp, ubc_getsize(vp), 0, 1); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 53)) | DBG_FUNC_END, vp->v_flag & VHASDIRTY, vp->v_clen, retval, 0, 0); return (retval); } static int cluster_try_push(vp, EOF, can_delay, push_all) struct vnode *vp; off_t EOF; int can_delay; int push_all; { int cl_index; int cl_index1; int min_index; int cl_len; int cl_total; int cl_pushed; struct v_cluster l_clusters[MAX_CLUSTERS]; /* * make a local 'sorted' copy of the clusters * and clear vp->v_clen so that new clusters can * be developed */ for (cl_index = 0; cl_index < vp->v_clen; cl_index++) { for (min_index = -1, cl_index1 = 0; cl_index1 < vp->v_clen; cl_index1++) { if (vp->v_clusters[cl_index1].start_pg == vp->v_clusters[cl_index1].last_pg) continue; if (min_index == -1) min_index = cl_index1; else if (vp->v_clusters[cl_index1].start_pg < vp->v_clusters[min_index].start_pg) min_index = cl_index1; } if (min_index == -1) break; l_clusters[cl_index].start_pg = vp->v_clusters[min_index].start_pg; l_clusters[cl_index].last_pg = vp->v_clusters[min_index].last_pg; vp->v_clusters[min_index].start_pg = vp->v_clusters[min_index].last_pg; } cl_len = cl_index; vp->v_clen = 0; for (cl_pushed = 0, cl_index = 0; cl_index < cl_len; cl_index++) { /* * try to push each cluster in turn... cluster_push_x may not * push the cluster if can_delay is TRUE and the cluster doesn't * meet the critera for an immediate push */ if (cluster_push_x(vp, EOF, l_clusters[cl_index].start_pg, l_clusters[cl_index].last_pg, can_delay)) { l_clusters[cl_index].start_pg = 0; l_clusters[cl_index].last_pg = 0; cl_pushed++; if (push_all == 0) break; } } if (cl_len > cl_pushed) { /* * we didn't push all of the clusters, so * lets try to merge them back in to the vnode */ if ((MAX_CLUSTERS - vp->v_clen) < (cl_len - cl_pushed)) { /* * we picked up some new clusters while we were trying to * push the old ones (I don't think this can happen because * I'm holding the lock, but just in case)... the sum of the * leftovers plus the new cluster count exceeds our ability * to represent them, so fall back to the VHASDIRTY mechanism */ for (cl_index = 0; cl_index < cl_len; cl_index++) { if (l_clusters[cl_index].start_pg == l_clusters[cl_index].last_pg) continue; if (l_clusters[cl_index].start_pg < vp->v_cstart) vp->v_cstart = l_clusters[cl_index].start_pg; if (l_clusters[cl_index].last_pg > vp->v_lastw) vp->v_lastw = l_clusters[cl_index].last_pg; } vp->v_flag |= VHASDIRTY; } else { /* * we've got room to merge the leftovers back in * just append them starting at the next 'hole' * represented by vp->v_clen */ for (cl_index = 0, cl_index1 = vp->v_clen; cl_index < cl_len; cl_index++) { if (l_clusters[cl_index].start_pg == l_clusters[cl_index].last_pg) continue; vp->v_clusters[cl_index1].start_pg = l_clusters[cl_index].start_pg; vp->v_clusters[cl_index1].last_pg = l_clusters[cl_index].last_pg; if (cl_index1 == 0) { vp->v_cstart = l_clusters[cl_index].start_pg; vp->v_lastw = l_clusters[cl_index].last_pg; } else { if (l_clusters[cl_index].start_pg < vp->v_cstart) vp->v_cstart = l_clusters[cl_index].start_pg; if (l_clusters[cl_index].last_pg > vp->v_lastw) vp->v_lastw = l_clusters[cl_index].last_pg; } cl_index1++; } /* * update the cluster count */ vp->v_clen = cl_index1; } } return(MAX_CLUSTERS - vp->v_clen); } static int cluster_push_x(vp, EOF, first, last, can_delay) struct vnode *vp; off_t EOF; daddr_t first; daddr_t last; int can_delay; { upl_page_info_t *pl; upl_t upl; vm_offset_t upl_offset; int upl_size; off_t upl_f_offset; int pages_in_upl; int start_pg; int last_pg; int io_size; int io_flags; int size; kern_return_t kret; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 51)) | DBG_FUNC_START, vp->v_clen, first, last, EOF, 0); if ((pages_in_upl = last - first) == 0) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 51)) | DBG_FUNC_END, 1, 0, 0, 0, 0); return (1); } upl_size = pages_in_upl * PAGE_SIZE; upl_f_offset = ((off_t)first) * PAGE_SIZE_64; if (upl_f_offset + upl_size >= EOF) { if (upl_f_offset >= EOF) { /* * must have truncated the file and missed * clearing a dangling cluster (i.e. it's completely * beyond the new EOF */ KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 51)) | DBG_FUNC_END, 1, 1, 0, 0, 0); return(1); } size = EOF - upl_f_offset; upl_size = (size + (PAGE_SIZE - 1) ) & ~(PAGE_SIZE - 1); pages_in_upl = upl_size / PAGE_SIZE; } else { if (can_delay && (pages_in_upl < (MAX_UPL_TRANSFER - (MAX_UPL_TRANSFER / 2)))) return(0); size = upl_size; } kret = ubc_create_upl(vp, upl_f_offset, upl_size, &upl, &pl, UPL_RET_ONLY_DIRTY); if (kret != KERN_SUCCESS) panic("cluster_push: failed to get pagelist"); if (can_delay) { int num_of_dirty; for (num_of_dirty = 0, start_pg = 0; start_pg < pages_in_upl; start_pg++) { if (upl_valid_page(pl, start_pg) && upl_dirty_page(pl, start_pg)) num_of_dirty++; } if (num_of_dirty < pages_in_upl / 2) { ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 51)) | DBG_FUNC_END, 0, 2, num_of_dirty, (pages_in_upl / 2), 0); return(0); } } last_pg = 0; while (size) { for (start_pg = last_pg; start_pg < pages_in_upl; start_pg++) { if (upl_valid_page(pl, start_pg) && upl_dirty_page(pl, start_pg)) break; } if (start_pg > last_pg) { io_size = (start_pg - last_pg) * PAGE_SIZE; ubc_upl_abort_range(upl, last_pg * PAGE_SIZE, io_size, UPL_ABORT_FREE_ON_EMPTY); if (io_size < size) size -= io_size; else break; } for (last_pg = start_pg; last_pg < pages_in_upl; last_pg++) { if (!upl_valid_page(pl, last_pg) || !upl_dirty_page(pl, last_pg)) break; } upl_offset = start_pg * PAGE_SIZE; io_size = min(size, (last_pg - start_pg) * PAGE_SIZE); if (vp->v_flag & VNOCACHE_DATA) io_flags = CL_COMMIT | CL_AGE | CL_ASYNC | CL_DUMP; else io_flags = CL_COMMIT | CL_AGE | CL_ASYNC; while (vp->v_numoutput >= ASYNC_THROTTLE) { vp->v_flag |= VTHROTTLED; tsleep((caddr_t)&vp->v_numoutput, PRIBIO + 1, "cluster_push", 0); } cluster_io(vp, upl, upl_offset, upl_f_offset + upl_offset, io_size, vp->v_ciosiz, io_flags, (struct buf *)0, (struct clios *)0); size -= io_size; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 51)) | DBG_FUNC_END, 1, 3, 0, 0, 0); return(1); } static int cluster_align_phys_io(struct vnode *vp, struct uio *uio, vm_offset_t usr_paddr, int xsize, int devblocksize, int flags) { struct iovec *iov; upl_page_info_t *pl; upl_t upl; vm_offset_t ubc_paddr; kern_return_t kret; int error = 0; iov = uio->uio_iov; kret = ubc_create_upl(vp, uio->uio_offset & ~PAGE_MASK_64, PAGE_SIZE, &upl, &pl, UPL_FLAGS_NONE); if (kret != KERN_SUCCESS) return(EINVAL); if (!upl_valid_page(pl, 0)) { /* * issue a synchronous read to cluster_io */ error = cluster_io(vp, upl, 0, uio->uio_offset & ~PAGE_MASK_64, PAGE_SIZE, devblocksize, CL_READ, (struct buf *)0, (struct clios *)0); if (error) { ubc_upl_abort_range(upl, 0, PAGE_SIZE, UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY); return(error); } } ubc_paddr = (vm_offset_t)upl_phys_page(pl, 0) + (int)(uio->uio_offset & PAGE_MASK_64); if (flags & CL_READ) copyp2p(ubc_paddr, usr_paddr, xsize, 2); else copyp2p(usr_paddr, ubc_paddr, xsize, 1); if ( !(flags & CL_READ) || upl_dirty_page(pl, 0)) { /* * issue a synchronous write to cluster_io */ error = cluster_io(vp, upl, 0, uio->uio_offset & ~PAGE_MASK_64, PAGE_SIZE, devblocksize, 0, (struct buf *)0, (struct clios *)0); } if (error == 0) { uio->uio_offset += xsize; iov->iov_base += xsize; iov->iov_len -= xsize; uio->uio_resid -= xsize; } ubc_upl_abort_range(upl, 0, PAGE_SIZE, UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY); return (error); }