X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/0c530ab8987f0ae6a1a3d9284f40182b88852816..593a1d5fd87cdf5b46dd5fcb84467b432cea0f91:/bsd/vfs/vfs_cluster.c diff --git a/bsd/vfs/vfs_cluster.c b/bsd/vfs/vfs_cluster.c index e2b4b14d0..9b1a7af25 100644 --- a/bsd/vfs/vfs_cluster.c +++ b/bsd/vfs/vfs_cluster.c @@ -1,23 +1,29 @@ /* - * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2007 Apple Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * - * The contents of this file constitute Original Code as defined in and - * are subject to the Apple Public Source License Version 1.1 (the - * "License"). You may not use this file except in compliance with the - * License. Please obtain a copy of the License at - * http://www.apple.com/publicsource and read it before using this file. + * This file contains Original Code and/or Modifications of Original Code + * as defined in and that are subject to the Apple Public Source License + * Version 2.0 (the 'License'). You may not use this file except in + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. + * + * The Original Code and all software distributed under the License are + * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the - * License for the specific language governing rights and limitations - * under the License. + * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. + * Please see the License for the specific language governing rights and + * limitations under the License. * - * @APPLE_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ /* @@ -70,6 +76,7 @@ #include #include +#include #include #include @@ -82,19 +89,20 @@ #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 -#define CL_THROTTLE 0x800 -#define CL_KEEPCACHED 0x1000 +#define CL_READ 0x01 +#define CL_WRITE 0x02 +#define CL_ASYNC 0x04 +#define CL_COMMIT 0x08 +#define CL_PAGEOUT 0x10 +#define CL_AGE 0x20 +#define CL_NOZERO 0x40 +#define CL_PAGEIN 0x80 +#define CL_DEV_MEMORY 0x100 +#define CL_PRESERVE 0x200 +#define CL_THROTTLE 0x400 +#define CL_KEEPCACHED 0x800 +#define CL_DIRECT_IO 0x1000 +#define CL_PASSIVE 0x2000 struct clios { @@ -110,38 +118,82 @@ static lck_grp_attr_t *cl_mtx_grp_attr; static lck_mtx_t *cl_mtxp; +#define IO_UNKNOWN 0 +#define IO_DIRECT 1 +#define IO_CONTIG 2 +#define IO_COPY 3 + +#define PUSH_DELAY 0x01 +#define PUSH_ALL 0x02 +#define PUSH_SYNC 0x04 + + +static void cluster_EOT(buf_t cbp_head, buf_t cbp_tail, int zero_offset); +static void cluster_wait_IO(buf_t cbp_head, int async); +static void cluster_complete_transaction(buf_t *cbp_head, void *callback_arg, int *retval, int flags, int needwait); + +static int cluster_io_type(struct uio *uio, int *io_type, u_int32_t *io_length, u_int32_t min_length); + static int cluster_io(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int non_rounded_size, - int flags, buf_t real_bp, struct clios *iostate); -static int cluster_iodone(buf_t bp, void *dummy); -static int cluster_rd_prefetch(vnode_t vp, off_t f_offset, u_int size, off_t filesize); + int flags, buf_t real_bp, struct clios *iostate, int (*)(buf_t, void *), void *callback_arg); +static int cluster_iodone(buf_t bp, void *callback_arg); +static int cluster_ioerror(upl_t upl, int upl_offset, int abort_size, int error, int io_flags); static int cluster_hard_throttle_on(vnode_t vp); -static int cluster_read_x(vnode_t vp, struct uio *uio, off_t filesize, int flags); -static int cluster_write_x(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, - off_t headOff, off_t tailOff, int flags); -static int cluster_nocopy_read(vnode_t vp, struct uio *uio, off_t filesize); -static int cluster_nocopy_write(vnode_t vp, struct uio *uio, off_t newEOF); -static int cluster_phys_read(vnode_t vp, struct uio *uio, off_t filesize); -static int cluster_phys_write(vnode_t vp, struct uio *uio, off_t newEOF); -static int cluster_align_phys_io(vnode_t vp, struct uio *uio, addr64_t usr_paddr, int xsize, int flags); +static void cluster_syncup(vnode_t vp, off_t newEOF, int (*)(buf_t, void *), void *callback_arg); -static void cluster_rd_ahead(vnode_t vp, struct cl_extent *extent, off_t filesize, struct cl_readahead *ra); +static void cluster_read_upl_release(upl_t upl, int start_pg, int last_pg, int flags); +static int cluster_copy_ubc_data_internal(vnode_t vp, struct uio *uio, int *io_resid, int mark_dirty, int take_reference); -static int cluster_push_x(vnode_t vp, struct cl_extent *, off_t EOF, int flags); -static void cluster_push_EOF(vnode_t vp, off_t EOF); +static int cluster_read_copy(vnode_t vp, struct uio *uio, u_int32_t io_req_size, off_t filesize, int flags, + int (*)(buf_t, void *), void *callback_arg); +static int cluster_read_direct(vnode_t vp, struct uio *uio, off_t filesize, int *read_type, u_int32_t *read_length, + int flags, int (*)(buf_t, void *), void *callback_arg); +static int cluster_read_contig(vnode_t vp, struct uio *uio, off_t filesize, int *read_type, u_int32_t *read_length, + int (*)(buf_t, void *), void *callback_arg, int flags); -static int cluster_try_push(struct cl_writebehind *, vnode_t vp, off_t EOF, int can_delay, int push_all); +static int cluster_write_copy(vnode_t vp, struct uio *uio, u_int32_t io_req_size, off_t oldEOF, off_t newEOF, + off_t headOff, off_t tailOff, int flags, int (*)(buf_t, void *), void *callback_arg); +static int cluster_write_direct(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, + int *write_type, u_int32_t *write_length, int flags, int (*)(buf_t, void *), void *callback_arg); +static int cluster_write_contig(vnode_t vp, struct uio *uio, off_t newEOF, + int *write_type, u_int32_t *write_length, int (*)(buf_t, void *), void *callback_arg, int bflag); -static void sparse_cluster_switch(struct cl_writebehind *, vnode_t vp, off_t EOF); -static void sparse_cluster_push(struct cl_writebehind *, vnode_t vp, off_t EOF, int push_all); -static void sparse_cluster_add(struct cl_writebehind *, vnode_t vp, struct cl_extent *, off_t EOF); +static int cluster_align_phys_io(vnode_t vp, struct uio *uio, addr64_t usr_paddr, u_int32_t xsize, int flags, int (*)(buf_t, void *), void *callback_arg); -static kern_return_t vfs_drt_mark_pages(void **cmapp, off_t offset, u_int length, int *setcountp); +static int cluster_read_prefetch(vnode_t vp, off_t f_offset, u_int size, off_t filesize, int (*callback)(buf_t, void *), void *callback_arg, int bflag); +static void cluster_read_ahead(vnode_t vp, struct cl_extent *extent, off_t filesize, struct cl_readahead *ra, int (*callback)(buf_t, void *), void *callback_arg, int bflag); + +static int cluster_push_now(vnode_t vp, struct cl_extent *, off_t EOF, int flags, int (*)(buf_t, void *), void *callback_arg); + +static int cluster_try_push(struct cl_writebehind *, vnode_t vp, off_t EOF, int push_flag, int (*)(buf_t, void *), void *callback_arg); + +static void sparse_cluster_switch(struct cl_writebehind *, vnode_t vp, off_t EOF, int (*)(buf_t, void *), void *callback_arg); +static void sparse_cluster_push(struct cl_writebehind *, vnode_t vp, off_t EOF, int push_flag, int (*)(buf_t, void *), void *callback_arg); +static void sparse_cluster_add(struct cl_writebehind *, vnode_t vp, struct cl_extent *, off_t EOF, int (*)(buf_t, void *), void *callback_arg); + +static kern_return_t vfs_drt_mark_pages(void **cmapp, off_t offset, u_int length, u_int *setcountp); static kern_return_t vfs_drt_get_cluster(void **cmapp, off_t *offsetp, u_int *lengthp); static kern_return_t vfs_drt_control(void **cmapp, int op_type); int is_file_clean(vnode_t, off_t); +/* + * limit the internal I/O size so that we + * can represent it in a 32 bit int + */ +#define MAX_IO_REQUEST_SIZE (1024 * 1024 * 256) +#define MAX_IO_CONTIG_SIZE (MAX_UPL_SIZE * PAGE_SIZE) +#define MAX_VECTS 16 +#define MIN_DIRECT_WRITE_SIZE (4 * PAGE_SIZE) + + +#define MAX_CLUSTER_SIZE(vp) (cluster_max_io_size(vp->v_mount, CL_WRITE)) +#define MAX_PREFETCH(vp) (cluster_max_io_size(vp->v_mount, CL_READ) * 3); + + +int speculative_reads_disabled = 0; + /* * throttle the number of async writes that * can be outstanding on a single vnode @@ -156,10 +208,10 @@ struct timeval priority_IO_timestamp_for_root; void cluster_init(void) { - /* + /* * allocate lock group attribute and group */ - cl_mtx_grp_attr = lck_grp_attr_alloc_init(); + cl_mtx_grp_attr = lck_grp_attr_alloc_init(); cl_mtx_grp = lck_grp_alloc_init("cluster I/O", cl_mtx_grp_attr); /* @@ -178,9 +230,58 @@ cluster_init(void) { } +uint32_t +cluster_max_io_size(mount_t mp, int type) +{ + uint32_t max_io_size; + uint32_t segcnt; + uint32_t maxcnt; + + switch(type) { + + case CL_READ: + segcnt = mp->mnt_segreadcnt; + maxcnt = mp->mnt_maxreadcnt; + break; + case CL_WRITE: + segcnt = mp->mnt_segwritecnt; + maxcnt = mp->mnt_maxwritecnt; + break; + default: + segcnt = min(mp->mnt_segreadcnt, mp->mnt_segwritecnt); + maxcnt = min(mp->mnt_maxreadcnt, mp->mnt_maxwritecnt); + break; + } + if (segcnt > MAX_UPL_SIZE) { + /* + * don't allow a size beyond the max UPL size we can create + */ + segcnt = MAX_UPL_SIZE; + } + max_io_size = min((segcnt * PAGE_SIZE), maxcnt); + + if (max_io_size < (MAX_UPL_TRANSFER * PAGE_SIZE)) { + /* + * don't allow a size smaller than the old fixed limit + */ + max_io_size = (MAX_UPL_TRANSFER * PAGE_SIZE); + } else { + /* + * make sure the size specified is a multiple of PAGE_SIZE + */ + max_io_size &= ~PAGE_MASK; + } + return (max_io_size); +} + + + #define CLW_ALLOCATE 0x01 #define CLW_RETURNLOCKED 0x02 +#define CLW_IONOCACHE 0x04 +#define CLW_IOPASSIVE 0x08 + /* * if the read ahead context doesn't yet exist, * allocate and initialize it... @@ -220,7 +321,7 @@ cluster_get_rap(vnode_t vp) else { lck_mtx_destroy(&rap->cl_lockr, cl_mtx_grp); FREE_ZONE((void *)rap, sizeof *rap, M_CLRDAHEAD); - rap = ubc->cl_rahead; + rap = ubc->cl_rahead; } vnode_unlock(vp); } @@ -269,7 +370,7 @@ cluster_get_wbp(vnode_t vp, int flags) else { lck_mtx_destroy(&wbp->cl_lockw, cl_mtx_grp); FREE_ZONE((void *)wbp, sizeof *wbp, M_CLWRBEHIND); - wbp = ubc->cl_wbehind; + wbp = ubc->cl_wbehind; } vnode_unlock(vp); } @@ -280,6 +381,24 @@ cluster_get_wbp(vnode_t vp, int flags) } +static void +cluster_syncup(vnode_t vp, off_t newEOF, int (*callback)(buf_t, void *), void *callback_arg) +{ + struct cl_writebehind *wbp; + + if ((wbp = cluster_get_wbp(vp, 0)) != NULL) { + + if (wbp->cl_number) { + lck_mtx_lock(&wbp->cl_lockw); + + cluster_try_push(wbp, vp, newEOF, PUSH_ALL | PUSH_SYNC, callback, callback_arg); + + lck_mtx_unlock(&wbp->cl_lockw); + } + } +} + + static int cluster_hard_throttle_on(vnode_t vp) { @@ -297,12 +416,63 @@ cluster_hard_throttle_on(vnode_t vp) if (timevalcmp(&elapsed, &hard_throttle_maxelapsed, <)) return(1); } + struct uthread *ut; + if (throttle_get_io_policy(&ut) == IOPOL_THROTTLE) { + size_t devbsdunit; + if (vp->v_mount != NULL) + devbsdunit = vp->v_mount->mnt_devbsdunit; + else + devbsdunit = LOWPRI_MAX_NUM_DEV - 1; + if (throttle_io_will_be_throttled(-1, devbsdunit)) { + return(1); + } + } return(0); } static int -cluster_iodone(buf_t bp, __unused void *dummy) +cluster_ioerror(upl_t upl, int upl_offset, int abort_size, int error, int io_flags) +{ + int upl_abort_code = 0; + int page_in = 0; + int page_out = 0; + + if (io_flags & B_PHYS) + /* + * direct write of any flavor, or a direct read that wasn't aligned + */ + ubc_upl_commit_range(upl, upl_offset, abort_size, UPL_COMMIT_FREE_ON_EMPTY); + else { + if (io_flags & B_PAGEIO) { + if (io_flags & B_READ) + page_in = 1; + else + page_out = 1; + } + if (io_flags & B_CACHE) + /* + * leave pages in the cache unchanged on error + */ + upl_abort_code = UPL_ABORT_FREE_ON_EMPTY; + else if (page_out && (error != ENXIO)) + /* + * transient error... leave pages unchanged + */ + upl_abort_code = UPL_ABORT_FREE_ON_EMPTY; + else if (page_in) + 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, abort_size, upl_abort_code); + } + return (upl_abort_code); +} + + +static int +cluster_iodone(buf_t bp, void *callback_arg) { int b_flags; int error; @@ -310,14 +480,17 @@ cluster_iodone(buf_t bp, __unused void *dummy) int total_resid; int upl_offset; int zero_offset; + int pg_offset = 0; + int commit_size = 0; + int upl_flags = 0; + int transaction_size = 0; upl_t upl; buf_t cbp; buf_t cbp_head; buf_t cbp_next; buf_t real_bp; struct clios *iostate; - int commit_size; - int pg_offset; + boolean_t transaction_complete = FALSE; cbp_head = (buf_t)(bp->b_trans_head); @@ -334,8 +507,16 @@ cluster_iodone(buf_t bp, __unused void *dummy) KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END, (int)cbp_head, (int)cbp, cbp->b_bcount, cbp->b_flags, 0); - return 0; + return 0; } + if (cbp->b_flags & B_EOT) + transaction_complete = TRUE; + } + if (transaction_complete == FALSE) { + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END, + (int)cbp_head, 0, 0, 0, 0); + + return 0; } error = 0; total_size = 0; @@ -361,13 +542,37 @@ cluster_iodone(buf_t bp, __unused void *dummy) cbp_next = cbp->b_trans_next; - free_io_buf(cbp); + if (cbp_next == NULL) + /* + * compute the overall size of the transaction + * in case we created one that has 'holes' in it + * 'total_size' represents the amount of I/O we + * did, not the span of the transaction w/r to the UPL + */ + transaction_size = cbp->b_uploffset + cbp->b_bcount - upl_offset; + + if (cbp != cbp_head) + free_io_buf(cbp); cbp = cbp_next; } + if (error == 0 && total_resid) + error = EIO; + + if (error == 0) { + int (*cliodone_func)(buf_t, void *) = (int (*)(buf_t, void *))(cbp_head->b_cliodone); + + if (cliodone_func != NULL) { + cbp_head->b_bcount = transaction_size; + + error = (*cliodone_func)(cbp_head, callback_arg); + } + } if (zero_offset) cluster_zero(upl, zero_offset, PAGE_SIZE - (zero_offset & PAGE_MASK), real_bp); + free_io_buf(cbp_head); + if (iostate) { int need_wakeup = 0; @@ -375,7 +580,7 @@ cluster_iodone(buf_t bp, __unused void *dummy) * someone has issued multiple I/Os asynchrounsly * and is waiting for them to complete (streaming) */ - lck_mtx_lock(cl_mtxp); + lck_mtx_lock_spin(cl_mtxp); if (error && iostate->io_error == 0) iostate->io_error = error; @@ -395,69 +600,37 @@ cluster_iodone(buf_t bp, __unused void *dummy) if (need_wakeup) 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; - - buf_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_MASK; - - if (error || (b_flags & B_NOCACHE)) { - int upl_abort_code; - int page_in = 0; - int page_out = 0; - - if (b_flags & B_PAGEIO) { - if (b_flags & B_READ) - page_in = 1; - else - page_out = 1; - } - if (b_flags & B_CACHE) /* leave pages in the cache unchanged on error */ - upl_abort_code = UPL_ABORT_FREE_ON_EMPTY; - else if (page_out && (error != ENXIO)) /* transient error */ - upl_abort_code = UPL_ABORT_FREE_ON_EMPTY; - else if (page_in) - 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); + pg_offset = upl_offset & PAGE_MASK; + commit_size = (pg_offset + transaction_size + (PAGE_SIZE - 1)) & ~PAGE_MASK; - } else { - int upl_commit_flags = UPL_COMMIT_FREE_ON_EMPTY; + if (error) + upl_flags = cluster_ioerror(upl, upl_offset - pg_offset, commit_size, error, b_flags); + else { + upl_flags = UPL_COMMIT_FREE_ON_EMPTY; if ((b_flags & B_PHYS) && (b_flags & B_READ)) - upl_commit_flags |= UPL_COMMIT_SET_DIRTY; + upl_flags |= UPL_COMMIT_SET_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); + upl_flags |= UPL_COMMIT_INACTIVATE; - KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END, - (int)upl, upl_offset - pg_offset, commit_size, - upl_commit_flags, 0); + ubc_upl_commit_range(upl, upl_offset - pg_offset, commit_size, upl_flags); } - } else { - KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END, - (int)upl, upl_offset, 0, error, 0); } + 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; + + buf_biodone(real_bp); + } + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 20)) | DBG_FUNC_END, + (int)upl, upl_offset - pg_offset, commit_size, (error << 24) | upl_flags, 0); return (error); } @@ -466,31 +639,37 @@ cluster_iodone(buf_t bp, __unused void *dummy) void cluster_zero(upl_t upl, vm_offset_t upl_offset, int size, buf_t bp) { - upl_page_info_t *pl; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 23)) | DBG_FUNC_START, upl_offset, size, (int)bp, 0, 0); if (bp == NULL || bp->b_datap == 0) { + upl_page_info_t *pl; + addr64_t zero_addr; pl = ubc_upl_pageinfo(upl); - while (size) { - int page_offset; - int page_index; - addr64_t zero_addr; - int zero_cnt; + if (upl_device_page(pl) == TRUE) { + zero_addr = ((addr64_t)upl_phys_page(pl, 0) << 12) + upl_offset; - page_index = upl_offset / PAGE_SIZE; - page_offset = upl_offset & PAGE_MASK; + bzero_phys_nc(zero_addr, size); + } else { + while (size) { + int page_offset; + int page_index; + int zero_cnt; + + page_index = upl_offset / PAGE_SIZE; + page_offset = upl_offset & PAGE_MASK; - zero_addr = ((addr64_t)upl_phys_page(pl, page_index) << 12) + page_offset; - zero_cnt = min(PAGE_SIZE - page_offset, size); + zero_addr = ((addr64_t)upl_phys_page(pl, page_index) << 12) + page_offset; + zero_cnt = min(PAGE_SIZE - page_offset, size); - bzero_phys(zero_addr, zero_cnt); + bzero_phys(zero_addr, zero_cnt); - size -= zero_cnt; - upl_offset += zero_cnt; + size -= zero_cnt; + upl_offset += zero_cnt; + } } } else bzero((caddr_t)((vm_offset_t)bp->b_datap + upl_offset), size); @@ -500,9 +679,75 @@ cluster_zero(upl_t upl, vm_offset_t upl_offset, int size, buf_t bp) } +static void +cluster_EOT(buf_t cbp_head, buf_t cbp_tail, int zero_offset) +{ + cbp_head->b_validend = zero_offset; + cbp_tail->b_flags |= B_EOT; +} + +static void +cluster_wait_IO(buf_t cbp_head, int async) +{ + buf_t cbp; + + if (async) { + /* + * async callback completion will not normally + * generate a wakeup upon I/O completion... + * by setting BL_WANTED, we will force a wakeup + * to occur as any outstanding I/Os complete... + * I/Os already completed will have BL_CALLDONE already + * set and we won't block in buf_biowait_callback.. + * note that we're actually waiting for the bp to have + * completed the callback function... only then + * can we safely take back ownership of the bp + * need the main buf mutex in order to safely + * update b_lflags + */ + buf_list_lock(); + + for (cbp = cbp_head; cbp; cbp = cbp->b_trans_next) + cbp->b_lflags |= BL_WANTED; + + buf_list_unlock(); + } + for (cbp = cbp_head; cbp; cbp = cbp->b_trans_next) { + if (async) + buf_biowait_callback(cbp); + else + buf_biowait(cbp); + } +} + +static void +cluster_complete_transaction(buf_t *cbp_head, void *callback_arg, int *retval, int flags, int needwait) +{ + buf_t cbp; + int error; + + /* + * cluster_complete_transaction will + * only be called if we've issued a complete chain in synchronous mode + * or, we've already done a cluster_wait_IO on an incomplete chain + */ + if (needwait) { + for (cbp = *cbp_head; cbp; cbp = cbp->b_trans_next) + buf_biowait(cbp); + } + error = cluster_iodone(*cbp_head, callback_arg); + + if ( !(flags & CL_ASYNC) && error && *retval == 0) { + if (((flags & (CL_PAGEOUT | CL_KEEPCACHED)) != CL_PAGEOUT) || (error != ENXIO)) + *retval = error; + } + *cbp_head = (buf_t)NULL; +} + + static int cluster_io(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int non_rounded_size, - int flags, buf_t real_bp, struct clios *iostate) + int flags, buf_t real_bp, struct clios *iostate, int (*callback)(buf_t, void *), void *callback_arg) { buf_t cbp; u_int size; @@ -514,6 +759,7 @@ cluster_io(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int no buf_t cbp_head = NULL; buf_t cbp_tail = NULL; int trans_count = 0; + int max_trans_count; u_int pg_count; int pg_offset; u_int max_iosize; @@ -522,10 +768,27 @@ cluster_io(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int no int zero_offset = 0; int async_throttle = 0; mount_t mp; + vm_offset_t upl_end_offset; + boolean_t need_EOT = FALSE; + + /* + * we currently don't support buffers larger than a page + */ + if (real_bp && non_rounded_size > PAGE_SIZE) + panic("%s(): Called with real buffer of size %d bytes which " + "is greater than the maximum allowed size of " + "%d bytes (the system PAGE_SIZE).\n", + __FUNCTION__, non_rounded_size, PAGE_SIZE); mp = vp->v_mount; - if (mp->mnt_devblocksize > 1) { + /* + * we don't want to do any funny rounding of the size for IO requests + * coming through the DIRECT or CONTIGUOUS paths... those pages don't + * belong to us... we can't extend (nor do we need to) the I/O to fill + * out a page + */ + if (mp->mnt_devblocksize > 1 && !(flags & (CL_DEV_MEMORY | CL_DIRECT_IO))) { /* * round the requested size up so that this I/O ends on a * page boundary in case this is a 'write'... if the filesystem @@ -549,17 +812,26 @@ cluster_io(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int no */ size = non_rounded_size; } - KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 22)) | DBG_FUNC_START, - (int)f_offset, size, upl_offset, flags, 0); + upl_end_offset = upl_offset + size; + + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 22)) | DBG_FUNC_START, (int)f_offset, size, upl_offset, flags, 0); + + /* + * Set the maximum transaction size to the maximum desired number of + * buffers. + */ + max_trans_count = 8; + if (flags & CL_DEV_MEMORY) + max_trans_count = 16; if (flags & CL_READ) { - io_flags = (B_READ); + io_flags = B_READ; bmap_flags = VNODE_READ; max_iosize = mp->mnt_maxreadcnt; max_vectors = mp->mnt_segreadcnt; } else { - io_flags = 0; + io_flags = B_WRITE; bmap_flags = VNODE_WRITE; max_iosize = mp->mnt_maxwritecnt; @@ -573,18 +845,42 @@ cluster_io(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int no */ max_iosize &= ~PAGE_MASK; + /* + * Ensure the maximum iosize is sensible. + */ + if (!max_iosize) + max_iosize = PAGE_SIZE; + if (flags & CL_THROTTLE) { if ( !(flags & CL_PAGEOUT) && cluster_hard_throttle_on(vp)) { if (max_iosize > HARD_THROTTLE_MAXSIZE) max_iosize = HARD_THROTTLE_MAXSIZE; async_throttle = HARD_THROTTLE_MAXCNT; - } else - async_throttle = VNODE_ASYNC_THROTTLE; + } else { + if ( (flags & CL_DEV_MEMORY) ) + async_throttle = VNODE_ASYNC_THROTTLE; + else { + u_int max_cluster; + u_int max_cluster_size; + u_int max_prefetch; + + max_cluster_size = MAX_CLUSTER_SIZE(vp); + max_prefetch = MAX_PREFETCH(vp); + + if (max_iosize > max_cluster_size) + max_cluster = max_cluster_size; + else + max_cluster = max_iosize; + + if (size < max_cluster) + max_cluster = size; + + async_throttle = min(VNODE_ASYNC_THROTTLE, (max_prefetch / max_cluster) - 1); + } + } } if (flags & CL_AGE) io_flags |= B_AGE; - if (flags & CL_DUMP) - io_flags |= B_NOCACHE; if (flags & (CL_PAGEIN | CL_PAGEOUT)) io_flags |= B_PAGEIO; if (flags & CL_COMMIT) @@ -593,6 +889,10 @@ cluster_io(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int no io_flags |= B_PHYS; if (flags & CL_KEEPCACHED) io_flags |= B_CACHE; + if (flags & CL_PASSIVE) + io_flags |= B_PASSIVE; + if (vp->v_flag & VSYSTEM) + io_flags |= B_META; if ((flags & CL_READ) && ((upl_offset + non_rounded_size) & PAGE_MASK) && (!(flags & CL_NOZERO))) { /* @@ -605,23 +905,28 @@ cluster_io(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int no zero_offset = upl_offset + non_rounded_size; } while (size) { - int pg_resid; daddr64_t blkno; daddr64_t lblkno; + u_int io_size_wanted; if (size > max_iosize) io_size = max_iosize; else io_size = size; + + io_size_wanted = io_size; - if ((error = VNOP_BLOCKMAP(vp, f_offset, io_size, &blkno, (size_t *)&io_size, NULL, bmap_flags, NULL))) { + if ((error = VNOP_BLOCKMAP(vp, f_offset, io_size, &blkno, (size_t *)&io_size, NULL, bmap_flags, NULL))) break; - } + + if (io_size > io_size_wanted) + io_size = io_size_wanted; + if (real_bp && (real_bp->b_blkno == real_bp->b_lblkno)) real_bp->b_blkno = blkno; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 24)) | DBG_FUNC_NONE, - (int)f_offset, (int)blkno, io_size, zero_offset, 0); + (int)f_offset, (int)(blkno>>32), (int)blkno, io_size, 0); if (io_size == 0) { /* @@ -635,7 +940,8 @@ cluster_io(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int no break; } if ( !(flags & CL_READ) && blkno == -1) { - off_t e_offset; + off_t e_offset; + int pageout_flags; /* * we're writing into a 'hole' @@ -649,17 +955,6 @@ cluster_io(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int no error = EINVAL; break; } - if ( !(flags & CL_COMMIT)) { - /* - * currently writes always request the commit to happen - * as part of the io completion... however, if the CL_COMMIT - * flag isn't specified, than we can't issue the abort_range - * since the call site is going to abort or commit the same upl.. - * in this case we can only return an error - */ - error = EINVAL; - break; - } /* * we can get here if the cluster code happens to * pick up a page that was dirtied via mmap vs @@ -678,15 +973,84 @@ cluster_io(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int no * giving up entirely and dumping it (the pageout * path will insure that the zero extent accounting * has been taken care of before we get back into cluster_io) + * + * go direct to vnode_pageout so that we don't have to + * unbusy the page from the UPL... we used to do this + * so that we could call ubc_sync_range, but that results + * in a potential deadlock if someone else races us to acquire + * that page and wins and in addition needs one of the pages + * we're continuing to hold in the UPL */ - ubc_upl_abort_range(upl, trunc_page(upl_offset), PAGE_SIZE, UPL_ABORT_FREE_ON_EMPTY); + pageout_flags = UPL_MSYNC | UPL_VNODE_PAGER | UPL_NESTED_PAGEOUT; - e_offset = round_page_64(f_offset + 1); + if ( !(flags & CL_ASYNC)) + pageout_flags |= UPL_IOSYNC; + if ( !(flags & CL_COMMIT)) + pageout_flags |= UPL_NOCOMMIT; + + if (cbp_head) { + buf_t last_cbp; + + /* + * first we have to wait for the the current outstanding I/Os + * to complete... EOT hasn't been set yet on this transaction + * so the pages won't be released just because all of the current + * I/O linked to this transaction has completed... + */ + cluster_wait_IO(cbp_head, (flags & CL_ASYNC)); + + /* + * we've got a transcation that + * includes the page we're about to push out through vnode_pageout... + * find the last bp in the list which will be the one that + * includes the head of this page and round it's iosize down + * to a page boundary... + */ + for (last_cbp = cbp = cbp_head; cbp->b_trans_next; cbp = cbp->b_trans_next) + last_cbp = cbp; + + cbp->b_bcount &= ~PAGE_MASK; + + if (cbp->b_bcount == 0) { + /* + * this buf no longer has any I/O associated with it + */ + free_io_buf(cbp); + + if (cbp == cbp_head) { + /* + * the buf we just freed was the only buf in + * this transaction... so there's no I/O to do + */ + cbp_head = NULL; + } else { + /* + * remove the buf we just freed from + * the transaction list + */ + last_cbp->b_trans_next = NULL; + cbp_tail = last_cbp; + } + } + if (cbp_head) { + /* + * there was more to the current transaction + * than just the page we are pushing out via vnode_pageout... + * mark it as finished and complete it... we've already + * waited for the I/Os to complete above in the call to cluster_wait_IO + */ + cluster_EOT(cbp_head, cbp_tail, 0); + + cluster_complete_transaction(&cbp_head, callback_arg, &retval, flags, 0); - if (ubc_sync_range(vp, f_offset, e_offset, UBC_PUSHDIRTY) == 0) { + trans_count = 0; + } + } + if (vnode_pageout(vp, upl, trunc_page(upl_offset), trunc_page_64(f_offset), PAGE_SIZE, pageout_flags, NULL) != PAGER_SUCCESS) { error = EINVAL; break; } + e_offset = round_page_64(f_offset + 1); io_size = e_offset - f_offset; f_offset += io_size; @@ -724,13 +1088,6 @@ cluster_io(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int no pg_offset = upl_offset & PAGE_MASK; if (flags & CL_DEV_MEMORY) { - /* - * currently, can't deal with reading 'holes' in file - */ - if (blkno == -1) { - error = EINVAL; - break; - } /* * treat physical requests as one 'giant' page */ @@ -739,14 +1096,16 @@ cluster_io(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int no pg_count = (io_size + pg_offset + (PAGE_SIZE - 1)) / PAGE_SIZE; if ((flags & CL_READ) && blkno == -1) { + vm_offset_t commit_offset; int bytes_to_zero; + int complete_transaction_now = 0; /* * 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 (io_size >= (u_int)non_rounded_size) { /* * if this upl contains the EOF and it is not a multiple of PAGE_SIZE * than 'zero_offset' will be non-zero @@ -756,56 +1115,73 @@ cluster_io(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int no * 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; + bytes_to_zero = non_rounded_size; + if (!(flags & CL_NOZERO)) + 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); + pg_count = 0; + + cluster_zero(upl, upl_offset, bytes_to_zero, real_bp); - if (cbp_head) + if (cbp_head) { + int pg_resid; + /* * 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)) + commit_offset = (upl_offset + (PAGE_SIZE - 1)) & ~PAGE_MASK; + + pg_resid = commit_offset - upl_offset; + + if (bytes_to_zero >= pg_resid) { + /* + * the last page of the current I/O + * has been completed... + * compute the number of fully zero'd + * pages that are beyond it + * plus the last page if its partial + * and we have no more I/O to issue... + * otherwise a partial page is left + * to begin the next I/O + */ + if ((int)io_size >= non_rounded_size) + pg_count = (bytes_to_zero - pg_resid + (PAGE_SIZE - 1)) / PAGE_SIZE; + else + pg_count = (bytes_to_zero - pg_resid) / PAGE_SIZE; + + complete_transaction_now = 1; + } + } else { /* - * 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 + * no pending I/O to deal with + * so, commit all of the fully zero'd pages + * plus the last page if its partial + * and we have no more I/O to issue... + * otherwise a partial page is left + * to begin the next I/O */ - pg_count++; - - if (pg_count) { - if (pg_offset) - pg_resid = PAGE_SIZE - pg_offset; + if ((int)io_size >= non_rounded_size) + pg_count = (pg_offset + bytes_to_zero + (PAGE_SIZE - 1)) / PAGE_SIZE; else - pg_resid = 0; + pg_count = (pg_offset + bytes_to_zero) / PAGE_SIZE; - 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); + commit_offset = upl_offset & ~PAGE_MASK; + } + if ( (flags & CL_COMMIT) && pg_count) { + ubc_upl_commit_range(upl, commit_offset, pg_count * PAGE_SIZE, + UPL_COMMIT_CLEAR_DIRTY | UPL_COMMIT_FREE_ON_EMPTY); } upl_offset += io_size; f_offset += io_size; size -= io_size; + /* * keep track of how much of the original request * that we've actually completed... non_rounded_size @@ -823,10 +1199,16 @@ cluster_io(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int no */ size = 0; } - if (cbp_head && pg_count) - goto start_io; - continue; + if (cbp_head && (complete_transaction_now || size == 0)) { + cluster_wait_IO(cbp_head, (flags & CL_ASYNC)); + + cluster_EOT(cbp_head, cbp_tail, size == 0 ? zero_offset : 0); + + cluster_complete_transaction(&cbp_head, callback_arg, &retval, flags, 0); + trans_count = 0; + } + continue; } if (pg_count > max_vectors) { if (((pg_count - max_vectors) * PAGE_SIZE) > io_size) { @@ -837,6 +1219,35 @@ cluster_io(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int no pg_count = max_vectors; } } + /* + * If the transaction is going to reach the maximum number of + * desired elements, truncate the i/o to the nearest page so + * that the actual i/o is initiated after this buffer is + * created and added to the i/o chain. + * + * I/O directed to physically contiguous memory + * doesn't have a requirement to make sure we 'fill' a page + */ + if ( !(flags & CL_DEV_MEMORY) && trans_count >= max_trans_count && + ((upl_offset + io_size) & PAGE_MASK)) { + vm_offset_t aligned_ofs; + + aligned_ofs = (upl_offset + io_size) & ~PAGE_MASK; + /* + * If the io_size does not actually finish off even a + * single page we have to keep adding buffers to the + * transaction despite having reached the desired limit. + * + * Eventually we get here with the page being finished + * off (and exceeded) and then we truncate the size of + * this i/o request so that it is page aligned so that + * we can finally issue the i/o on the transaction. + */ + if (aligned_ofs > upl_offset) { + io_size = aligned_ofs - upl_offset; + pg_count--; + } + } if ( !(mp->mnt_kern_flag & MNTK_VIRTUALDEV)) /* @@ -865,9 +1276,10 @@ cluster_io(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int no } } if (flags & CL_ASYNC) { - if (buf_setcallback(cbp, (void *)cluster_iodone, NULL)) + if (buf_setcallback(cbp, (void *)cluster_iodone, callback_arg)) panic("buf_setcallback failed\n"); } + cbp->b_cliodone = (void *)callback; cbp->b_flags |= io_flags; cbp->b_lblkno = lblkno; @@ -901,8 +1313,14 @@ cluster_io(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int no } else { cbp_head = cbp; cbp_tail = cbp; + + if ( (cbp_head->b_real_bp = real_bp) ) { + cbp_head->b_flags |= B_NEED_IODONE; + real_bp = (buf_t)NULL; + } } - (buf_t)(cbp->b_trans_head) = cbp_head; + *(buf_t *)(&cbp->b_trans_head) = cbp_head; + trans_count++; upl_offset += io_size; @@ -925,86 +1343,77 @@ cluster_io(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int no */ size = 0; } - if ( (!(upl_offset & PAGE_MASK) && !(flags & CL_DEV_MEMORY) && ((flags & CL_ASYNC) || trans_count > 8)) || size == 0) { + if (size == 0) { + /* + * we have no more I/O to issue, so go + * finish the final transaction + */ + need_EOT = TRUE; + } else if ( ((flags & CL_DEV_MEMORY) || (upl_offset & PAGE_MASK) == 0) && + ((flags & CL_ASYNC) || trans_count > max_trans_count) ) { /* - * if we have no more I/O to issue or + * I/O directed to physically contiguous memory... + * which doesn't have a requirement to make sure we 'fill' a page + * or... * the current I/O we've prepared fully * completes the last page in this request - * and it's either an ASYNC request or + * 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 + * this transaction so mark it as complete so that + * it can finish asynchronously or via the cluster_complete_transaction + * below if the request is synchronous */ -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 = (buf_t)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; - - if (flags & CL_THROTTLE) - (void)vnode_waitforwrites(vp, async_throttle, 0, 0, (char *)"cluster_io"); - - for (cbp = cbp_head; cbp;) { - buf_t cbp_next; + need_EOT = TRUE; + } + if (need_EOT == TRUE) + cluster_EOT(cbp_head, cbp_tail, size == 0 ? zero_offset : 0); - if ( !(io_flags & B_READ)) - vnode_startwrite(vp); + if (flags & CL_THROTTLE) + (void)vnode_waitforwrites(vp, async_throttle, 0, 0, "cluster_io"); - cbp_next = cbp->b_trans_next; + if ( !(io_flags & B_READ)) + vnode_startwrite(vp); - (void) VNOP_STRATEGY(cbp); - cbp = cbp_next; - } - if ( !(flags & CL_ASYNC)) { - int dummy; - - for (cbp = cbp_head; cbp; cbp = cbp->b_trans_next) - buf_biowait(cbp); - - if ((error = cluster_iodone(cbp_head, (void *)&dummy))) { - if (((flags & (CL_PAGEOUT | CL_KEEPCACHED)) == CL_PAGEOUT) && (error == ENXIO)) - error = 0; /* drop the error */ - else { - if (retval == 0) - retval = error; - error = 0; - } - } - } - cbp_head = (buf_t)NULL; - cbp_tail = (buf_t)NULL; + (void) VNOP_STRATEGY(cbp); + + if (need_EOT == TRUE) { + if ( !(flags & CL_ASYNC)) + cluster_complete_transaction(&cbp_head, callback_arg, &retval, flags, 1); + need_EOT = FALSE; trans_count = 0; + cbp_head = NULL; } - } + } if (error) { int abort_size; io_size = 0; - for (cbp = cbp_head; cbp;) { - buf_t cbp_next; - - upl_offset -= cbp->b_bcount; - size += cbp->b_bcount; - io_size += cbp->b_bcount; + if (cbp_head) { + /* + * first wait until all of the outstanding I/O + * for this partial transaction has completed + */ + cluster_wait_IO(cbp_head, (flags & CL_ASYNC)); - cbp_next = cbp->b_trans_next; - free_io_buf(cbp); - cbp = cbp_next; + /* + * Rewind the upl offset to the beginning of the + * transaction. + */ + upl_offset = cbp_head->b_uploffset; + + for (cbp = cbp_head; cbp;) { + buf_t cbp_next; + + size += cbp->b_bcount; + io_size += cbp->b_bcount; + + cbp_next = cbp->b_trans_next; + free_io_buf(cbp); + cbp = cbp_next; + } } if (iostate) { int need_wakeup = 0; @@ -1014,7 +1423,7 @@ start_io: * since we never really issued the io * just go ahead and adjust it back */ - lck_mtx_lock(cl_mtxp); + lck_mtx_lock_spin(cl_mtxp); if (iostate->io_error == 0) iostate->io_error = error; @@ -1026,54 +1435,49 @@ start_io: * this io stream to change */ iostate->io_wanted = 0; - need_wakeup = 0; + need_wakeup = 1; } lck_mtx_unlock(cl_mtxp); if (need_wakeup) wakeup((caddr_t)&iostate->io_wanted); } - pg_offset = upl_offset & PAGE_MASK; - abort_size = (size + pg_offset + (PAGE_SIZE - 1)) & ~PAGE_MASK; - if (flags & CL_COMMIT) { - int upl_abort_code; + int upl_flags; - if (flags & CL_PRESERVE) { - ubc_upl_commit_range(upl, upl_offset - pg_offset, abort_size, - UPL_COMMIT_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); - } + pg_offset = upl_offset & PAGE_MASK; + abort_size = (upl_end_offset - upl_offset + PAGE_MASK) & ~PAGE_MASK; + + upl_flags = cluster_ioerror(upl, upl_offset - pg_offset, abort_size, error, io_flags); + 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; - - buf_biodone(real_bp); + (int)upl, upl_offset - pg_offset, abort_size, (error << 24) | upl_flags, 0); } if (retval == 0) retval = error; + } else if (cbp_head) + panic("%s(): cbp_head is not NULL.\n", __FUNCTION__); + + if (real_bp) { + /* + * can get here if we either encountered an error + * or we completely zero-filled the request and + * no I/O was issued + */ + if (error) { + real_bp->b_flags |= B_ERROR; + real_bp->b_error = error; + } + buf_biodone(real_bp); } - KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 22)) | DBG_FUNC_END, - (int)f_offset, size, upl_offset, retval, 0); + 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(vnode_t vp, off_t f_offset, u_int size, off_t filesize) +cluster_read_prefetch(vnode_t vp, off_t f_offset, u_int size, off_t filesize, int (*callback)(buf_t, void *), void *callback_arg, int bflag) { int pages_in_prefetch; @@ -1085,16 +1489,11 @@ cluster_rd_prefetch(vnode_t vp, off_t f_offset, u_int size, off_t filesize) (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_MASK; - if ((off_t)size > (filesize - f_offset)) size = filesize - f_offset; pages_in_prefetch = (size + (PAGE_SIZE - 1)) / PAGE_SIZE; - advisory_read(vp, filesize, f_offset, size); + advisory_read_ext(vp, filesize, f_offset, size, callback, callback_arg, bflag); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 49)) | DBG_FUNC_END, (int)f_offset + size, pages_in_prefetch, 0, 1, 0); @@ -1105,11 +1504,13 @@ cluster_rd_prefetch(vnode_t vp, off_t f_offset, u_int size, off_t filesize) static void -cluster_rd_ahead(vnode_t vp, struct cl_extent *extent, off_t filesize, struct cl_readahead *rap) +cluster_read_ahead(vnode_t vp, struct cl_extent *extent, off_t filesize, struct cl_readahead *rap, int (*callback)(buf_t, void *), void *callback_arg, + int bflag) { daddr64_t r_addr; off_t f_offset; int size_of_prefetch; + u_int max_prefetch; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_START, @@ -1120,8 +1521,7 @@ cluster_rd_ahead(vnode_t vp, struct cl_extent *extent, off_t filesize, struct cl rap->cl_ralen, (int)rap->cl_maxra, (int)rap->cl_lastr, 0, 0); return; } - if (rap->cl_lastr == -1 || (extent->b_addr != rap->cl_lastr && extent->b_addr != (rap->cl_lastr + 1) && - (extent->b_addr != (rap->cl_maxra + 1) || rap->cl_ralen == 0))) { + if (rap->cl_lastr == -1 || (extent->b_addr != rap->cl_lastr && extent->b_addr != (rap->cl_lastr + 1))) { rap->cl_ralen = 0; rap->cl_maxra = 0; @@ -1130,8 +1530,10 @@ cluster_rd_ahead(vnode_t vp, struct cl_extent *extent, off_t filesize, struct cl return; } + max_prefetch = MAX_PREFETCH(vp); + if (extent->e_addr < rap->cl_maxra) { - if ((rap->cl_maxra - extent->e_addr) > (MAX_UPL_TRANSFER / 4)) { + if ((rap->cl_maxra - extent->e_addr) > ((max_prefetch / PAGE_SIZE) / 4)) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 48)) | DBG_FUNC_END, rap->cl_ralen, (int)rap->cl_maxra, (int)rap->cl_lastr, 2, 0); @@ -1153,17 +1555,17 @@ cluster_rd_ahead(vnode_t vp, struct cl_extent *extent, off_t filesize, struct cl if (f_offset < filesize) { daddr64_t read_size; - rap->cl_ralen = rap->cl_ralen ? min(MAX_UPL_TRANSFER, rap->cl_ralen << 1) : 1; + rap->cl_ralen = rap->cl_ralen ? min(max_prefetch / PAGE_SIZE, rap->cl_ralen << 1) : 1; read_size = (extent->e_addr + 1) - extent->b_addr; if (read_size > rap->cl_ralen) { - if (read_size > MAX_UPL_TRANSFER) - rap->cl_ralen = MAX_UPL_TRANSFER; + if (read_size > max_prefetch / PAGE_SIZE) + rap->cl_ralen = max_prefetch / PAGE_SIZE; else rap->cl_ralen = read_size; } - size_of_prefetch = cluster_rd_prefetch(vp, f_offset, rap->cl_ralen * PAGE_SIZE, filesize); + size_of_prefetch = cluster_read_prefetch(vp, f_offset, rap->cl_ralen * PAGE_SIZE, filesize, callback, callback_arg, bflag); if (size_of_prefetch) rap->cl_maxra = (r_addr + size_of_prefetch) - 1; @@ -1172,15 +1574,24 @@ cluster_rd_ahead(vnode_t vp, struct cl_extent *extent, off_t filesize, struct cl rap->cl_ralen, (int)rap->cl_maxra, (int)rap->cl_lastr, 4, 0); } + int cluster_pageout(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int size, off_t filesize, int flags) +{ + return cluster_pageout_ext(vp, upl, upl_offset, f_offset, size, filesize, flags, NULL, NULL); + +} + + +int +cluster_pageout_ext(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, + int size, off_t filesize, int flags, int (*callback)(buf_t, void *), void *callback_arg) { int io_size; int rounded_size; off_t max_size; int local_flags; - struct cl_writebehind *wbp; if (vp->v_mount->mnt_kern_flag & MNTK_VIRTUALDEV) /* @@ -1201,6 +1612,8 @@ cluster_pageout(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, local_flags |= CL_COMMIT; if ((flags & UPL_KEEPCACHED)) local_flags |= CL_KEEPCACHED; + if (flags & IO_PASSIVE) + local_flags |= CL_PASSIVE; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 52)) | DBG_FUNC_NONE, @@ -1245,16 +1658,22 @@ cluster_pageout(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, ubc_upl_abort_range(upl, upl_offset + rounded_size, size - rounded_size, UPL_ABORT_FREE_ON_EMPTY); } - if ((wbp = cluster_get_wbp(vp, 0)) != NULL) - wbp->cl_hasbeenpaged = 1; - return (cluster_io(vp, upl, upl_offset, f_offset, io_size, - local_flags, (buf_t)NULL, (struct clios *)NULL)); + local_flags, (buf_t)NULL, (struct clios *)NULL, callback, callback_arg)); } + int cluster_pagein(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, int size, off_t filesize, int flags) +{ + return cluster_pagein_ext(vp, upl, upl_offset, f_offset, size, filesize, flags, NULL, NULL); +} + + +int +cluster_pagein_ext(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, + int size, off_t filesize, int flags, int (*callback)(buf_t, void *), void *callback_arg) { u_int io_size; int rounded_size; @@ -1269,6 +1688,8 @@ cluster_pagein(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, local_flags |= CL_ASYNC; if ((flags & UPL_NOCOMMIT) == 0) local_flags |= CL_COMMIT; + if (flags & IO_PASSIVE) + local_flags |= CL_PASSIVE; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 56)) | DBG_FUNC_NONE, @@ -1300,37 +1721,21 @@ cluster_pagein(vnode_t vp, upl_t upl, vm_offset_t upl_offset, off_t f_offset, size - rounded_size, UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_ERROR); retval = cluster_io(vp, upl, upl_offset, f_offset, io_size, - local_flags | CL_READ | CL_PAGEIN, (buf_t)NULL, (struct clios *)NULL); - - if (retval == 0 && !(flags & UPL_NORDAHEAD) && !(vp->v_flag & VRAOFF)) { - struct cl_readahead *rap; - - rap = cluster_get_rap(vp); - - if (rap != NULL) { - struct cl_extent extent; - - extent.b_addr = (daddr64_t)(f_offset / PAGE_SIZE_64); - extent.e_addr = (daddr64_t)((f_offset + ((off_t)io_size - 1)) / PAGE_SIZE_64); - - if (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, &extent, filesize, rap); - } - rap->cl_lastr = extent.e_addr; + local_flags | CL_READ | CL_PAGEIN, (buf_t)NULL, (struct clios *)NULL, callback, callback_arg); - lck_mtx_unlock(&rap->cl_lockr); - } - } return (retval); } + int cluster_bp(buf_t bp) +{ + return cluster_bp_ext(bp, NULL, NULL); +} + + +int +cluster_bp_ext(buf_t bp, int (*callback)(buf_t, void *), void *callback_arg) { off_t f_offset; int flags; @@ -1342,244 +1747,249 @@ cluster_bp(buf_t bp) flags = CL_ASYNC | CL_READ; else flags = CL_ASYNC; + if (bp->b_flags & B_PASSIVE) + flags |= CL_PASSIVE; f_offset = ubc_blktooff(bp->b_vp, bp->b_lblkno); - return (cluster_io(bp->b_vp, bp->b_upl, 0, f_offset, bp->b_bcount, flags, bp, (struct clios *)NULL)); + return (cluster_io(bp->b_vp, bp->b_upl, 0, f_offset, bp->b_bcount, flags, bp, (struct clios *)NULL, callback, callback_arg)); } + + int cluster_write(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t headOff, off_t tailOff, int xflags) { - int prev_resid; - u_int clip_size; - off_t max_io_size; - int upl_size; - int upl_flags; - upl_t upl; - int retval = 0; - int flags; + return cluster_write_ext(vp, uio, oldEOF, newEOF, headOff, tailOff, xflags, NULL, NULL); +} + + +int +cluster_write_ext(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t headOff, off_t tailOff, + int xflags, int (*callback)(buf_t, void *), void *callback_arg) +{ + user_ssize_t cur_resid; + int retval = 0; + int flags; + int zflags; + int bflag; + int write_type = IO_COPY; + u_int32_t write_length; flags = xflags; + if (flags & IO_PASSIVE) + bflag = CL_PASSIVE; + else + bflag = 0; + if (vp->v_flag & VNOCACHE_DATA) flags |= IO_NOCACHE; - if ( (!(flags & IO_NOCACHE)) || (!uio) || (!UIO_SEG_IS_USER_SPACE(uio->uio_segflg))) { + if (uio == NULL) { /* - * go do a write through the cache if one of the following is true.... - * NOCACHE is not true - * there is no uio structure or it doesn't target USERSPACE + * no user data... + * this call is being made to zero-fill some range in the file */ - return (cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, flags)); - } + retval = cluster_write_copy(vp, NULL, (u_int32_t)0, oldEOF, newEOF, headOff, tailOff, flags, callback, callback_arg); -#if LP64_DEBUG - if (IS_VALID_UIO_SEGFLG(uio->uio_segflg) == 0) { - panic("%s :%d - invalid uio_segflg\n", __FILE__, __LINE__); + return(retval); } -#endif /* LP64_DEBUG */ - - while (uio_resid(uio) && uio->uio_offset < newEOF && retval == 0) { - user_size_t iov_len; - user_addr_t iov_base; - - /* - * we know we have a resid, so this is safe - * skip over any emtpy vectors - */ - uio_update(uio, (user_size_t)0); - - iov_len = uio_curriovlen(uio); - iov_base = uio_curriovbase(uio); - - upl_size = PAGE_SIZE; - upl_flags = UPL_QUERY_OBJECT_TYPE; - - // LP64todo - fix this! - if ((vm_map_get_upl(current_map(), - (vm_map_offset_t)(iov_base & ~((user_addr_t)PAGE_MASK)), - &upl_size, &upl, NULL, NULL, &upl_flags, 0)) != KERN_SUCCESS) { - /* - * the user app must have passed in an invalid address - */ - return (EFAULT); - } - - /* - * We check every vector target but if it is physically - * contiguous space, we skip the sanity checks. + /* + * do a write through the cache if one of the following is true.... + * NOCACHE is not true and + * the uio request doesn't target USERSPACE + * otherwise, find out if we want the direct or contig variant for + * the first vector in the uio request + */ + if ( (flags & IO_NOCACHE) && UIO_SEG_IS_USER_SPACE(uio->uio_segflg) ) + retval = cluster_io_type(uio, &write_type, &write_length, MIN_DIRECT_WRITE_SIZE); + + if ( (flags & (IO_TAILZEROFILL | IO_HEADZEROFILL)) && write_type == IO_DIRECT) + /* + * must go through the cached variant in this case */ - if (upl_flags & UPL_PHYS_CONTIG) { - int zflags; - - zflags = flags & ~IO_TAILZEROFILL; - zflags |= IO_HEADZEROFILL; - - if (flags & IO_HEADZEROFILL) { - /* - * in case we have additional vectors, we don't want to do this again - */ - flags &= ~IO_HEADZEROFILL; + write_type = IO_COPY; - if ((retval = cluster_write_x(vp, (struct uio *)0, 0, uio->uio_offset, headOff, 0, zflags))) - return(retval); - } - retval = cluster_phys_write(vp, uio, newEOF); + while ((cur_resid = uio_resid(uio)) && uio->uio_offset < newEOF && retval == 0) { + + switch (write_type) { - if (uio_resid(uio) == 0 && (flags & IO_TAILZEROFILL)) { - return (cluster_write_x(vp, (struct uio *)0, 0, tailOff, uio->uio_offset, 0, zflags)); - } - } - else if ((uio_resid(uio) < PAGE_SIZE) || (flags & (IO_TAILZEROFILL | IO_HEADZEROFILL))) { + case IO_COPY: /* - * we're here because we're don't have a physically contiguous target buffer - * go do a write through the cache if one of the following is true.... - * the total xfer size is less than a page... - * we're being asked to ZEROFILL either the head or the tail of the I/O... + * make sure the uio_resid isn't too big... + * internally, we want to handle all of the I/O in + * chunk sizes that fit in a 32 bit int */ - return (cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, flags)); - } - // LP64todo - fix this! - else if (((int)uio->uio_offset & PAGE_MASK) || (CAST_DOWN(int, iov_base) & PAGE_MASK)) { - if (((int)uio->uio_offset & PAGE_MASK) == (CAST_DOWN(int, iov_base) & PAGE_MASK)) { + if (cur_resid > (user_ssize_t)(MAX_IO_REQUEST_SIZE)) { /* - * Bring the file offset write up to a pagesize boundary - * this will also bring the base address to a page boundary - * since they both are currently on the same offset within a page - * note: if we get here, uio->uio_resid is greater than PAGE_SIZE - * so the computed clip_size must always be less than the current uio_resid + * we're going to have to call cluster_write_copy + * more than once... + * + * only want the last call to cluster_write_copy to + * have the IO_TAILZEROFILL flag set and only the + * first call should have IO_HEADZEROFILL */ - clip_size = (PAGE_SIZE - (uio->uio_offset & PAGE_MASK_64)); + zflags = flags & ~IO_TAILZEROFILL; + flags &= ~IO_HEADZEROFILL; - /* - * Fake the resid going into the cluster_write_x call - * and restore it on the way out. + write_length = MAX_IO_REQUEST_SIZE; + } else { + /* + * last call to cluster_write_copy */ - // LP64todo - fix this - prev_resid = uio_resid(uio); - uio_setresid(uio, clip_size); + zflags = flags; + + write_length = (u_int32_t)cur_resid; + } + retval = cluster_write_copy(vp, uio, write_length, oldEOF, newEOF, headOff, tailOff, zflags, callback, callback_arg); + break; - retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, flags); + case IO_CONTIG: + zflags = flags & ~(IO_TAILZEROFILL | IO_HEADZEROFILL); - uio_setresid(uio, prev_resid - (clip_size - uio_resid(uio))); - } else { - /* - * can't get both the file offset and the buffer offset aligned to a page boundary - * so fire an I/O through the cache for this entire vector + if (flags & IO_HEADZEROFILL) { + /* + * only do this once per request */ - // LP64todo - fix this - clip_size = iov_len; - // LP64todo - fix this - prev_resid = uio_resid(uio); - uio_setresid(uio, clip_size); - - retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, flags); + flags &= ~IO_HEADZEROFILL; - uio_setresid(uio, prev_resid - (clip_size - uio_resid(uio))); + retval = cluster_write_copy(vp, (struct uio *)0, (u_int32_t)0, (off_t)0, uio->uio_offset, + headOff, (off_t)0, zflags | IO_HEADZEROFILL | IO_SYNC, callback, callback_arg); + if (retval) + break; } - } else { - /* - * If we come in here, we know the offset into - * the file is on a pagesize boundary and the - * target buffer address is also on a page boundary - */ - max_io_size = newEOF - uio->uio_offset; - // LP64todo - fix this - clip_size = uio_resid(uio); - if (iov_len < clip_size) - // LP64todo - fix this! - clip_size = 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 + retval = cluster_write_contig(vp, uio, newEOF, &write_type, &write_length, callback, callback_arg, bflag); + + if (retval == 0 && (flags & IO_TAILZEROFILL) && uio_resid(uio) == 0) { + /* + * we're done with the data from the user specified buffer(s) + * and we've been requested to zero fill at the tail + * treat this as an IO_HEADZEROFILL which doesn't require a uio + * by rearranging the args and passing in IO_HEADZEROFILL */ - // LP64todo - fix this - prev_resid = uio_resid(uio); - uio_setresid(uio, clip_size); - - retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, flags); - - uio_setresid(uio, prev_resid - (clip_size - uio_resid(uio))); - } else { - /* round clip_size down to a multiple of pagesize */ - clip_size = clip_size & ~(PAGE_MASK); - // LP64todo - fix this - prev_resid = uio_resid(uio); - uio_setresid(uio, clip_size); - - retval = cluster_nocopy_write(vp, uio, newEOF); - - if ((retval == 0) && uio_resid(uio)) - retval = cluster_write_x(vp, uio, oldEOF, newEOF, headOff, tailOff, flags); - - uio_setresid(uio, prev_resid - (clip_size - uio_resid(uio))); + retval = cluster_write_copy(vp, (struct uio *)0, (u_int32_t)0, (off_t)0, tailOff, uio->uio_offset, + (off_t)0, zflags | IO_HEADZEROFILL | IO_SYNC, callback, callback_arg); } - } /* end else */ - } /* end while */ + break; - return(retval); + case IO_DIRECT: + /* + * cluster_write_direct is never called with IO_TAILZEROFILL || IO_HEADZEROFILL + */ + retval = cluster_write_direct(vp, uio, oldEOF, newEOF, &write_type, &write_length, flags, callback, callback_arg); + break; + + case IO_UNKNOWN: + retval = cluster_io_type(uio, &write_type, &write_length, MIN_DIRECT_WRITE_SIZE); + break; + } + } + return (retval); } static int -cluster_nocopy_write(vnode_t vp, struct uio *uio, off_t newEOF) +cluster_write_direct(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, int *write_type, u_int32_t *write_length, + int flags, int (*callback)(buf_t, void *), void *callback_arg) { upl_t upl; upl_page_info_t *pl; vm_offset_t upl_offset; - int io_size; + u_int32_t io_req_size; + u_int32_t offset_in_file; + u_int32_t offset_in_iovbase; + u_int32_t io_size; int io_flag; - int upl_size; - int upl_needed_size; - int pages_in_pl; + int bflag; + vm_size_t upl_size; + vm_size_t upl_needed_size; + mach_msg_type_number_t pages_in_pl; int upl_flags; kern_return_t kret; - int i; + mach_msg_type_number_t i; int force_data_sync; - int error = 0; + int retval = 0; + int first_IO = 1; struct clios iostate; - struct cl_writebehind *wbp; + user_addr_t iov_base; + u_int32_t mem_alignment_mask; + u_int32_t devblocksize; + u_int32_t max_upl_size; - KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 75)) | DBG_FUNC_START, - (int)uio->uio_offset, (int)uio_resid(uio), - (int)newEOF, 0, 0); + max_upl_size = cluster_max_io_size(vp->v_mount, CL_WRITE); + + if (flags & IO_PASSIVE) + bflag = CL_PASSIVE; + else + bflag = 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 */ - - if ((wbp = cluster_get_wbp(vp, CLW_RETURNLOCKED)) != NULL) { - - cluster_try_push(wbp, vp, newEOF, 0, 1); + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 75)) | DBG_FUNC_START, + (int)uio->uio_offset, *write_length, (int)newEOF, 0, 0); - lck_mtx_unlock(&wbp->cl_lockw); - } iostate.io_completed = 0; iostate.io_issued = 0; iostate.io_error = 0; iostate.io_wanted = 0; - while (uio_resid(uio) && uio->uio_offset < newEOF && error == 0) { - user_addr_t iov_base; + mem_alignment_mask = (u_int32_t)vp->v_mount->mnt_alignmentmask; + devblocksize = (u_int32_t)vp->v_mount->mnt_devblocksize; + + if (devblocksize == 1) { + /* + * the AFP client advertises a devblocksize of 1 + * however, its BLOCKMAP routine maps to physical + * blocks that are PAGE_SIZE in size... + * therefore we can't ask for I/Os that aren't page aligned + * or aren't multiples of PAGE_SIZE in size + * by setting devblocksize to PAGE_SIZE, we re-instate + * the old behavior we had before the mem_alignment_mask + * changes went in... + */ + devblocksize = PAGE_SIZE; + } + +next_dwrite: + io_req_size = *write_length; + iov_base = uio_curriovbase(uio); - io_size = uio_resid(uio); + offset_in_file = (u_int32_t)uio->uio_offset & PAGE_MASK; + offset_in_iovbase = (u_int32_t)iov_base & mem_alignment_mask; + + if (offset_in_file || offset_in_iovbase) { + /* + * one of the 2 important offsets is misaligned + * so fire an I/O through the cache for this entire vector + */ + goto wait_for_dwrites; + } + if (iov_base & (devblocksize - 1)) { + /* + * the offset in memory must be on a device block boundary + * so that we can guarantee that we can generate an + * I/O that ends on a page boundary in cluster_io + */ + goto wait_for_dwrites; + } - if (io_size > (MAX_UPL_TRANSFER * PAGE_SIZE)) - io_size = MAX_UPL_TRANSFER * PAGE_SIZE; + while (io_req_size >= PAGE_SIZE && uio->uio_offset < newEOF && retval == 0) { + if (first_IO) { + cluster_syncup(vp, newEOF, callback, callback_arg); + first_IO = 0; + } + io_size = io_req_size & ~PAGE_MASK; iov_base = uio_curriovbase(uio); - // LP64todo - fix this! - upl_offset = CAST_DOWN(vm_offset_t, iov_base) & PAGE_MASK; - + if (io_size > max_upl_size) + io_size = max_upl_size; + + upl_offset = (vm_offset_t)((u_int32_t)iov_base & PAGE_MASK); upl_needed_size = (upl_offset + io_size + (PAGE_SIZE -1)) & ~PAGE_MASK; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_START, @@ -1591,7 +2001,6 @@ cluster_nocopy_write(vnode_t vp, struct uio *uio, off_t newEOF) upl_flags = UPL_FILE_IO | UPL_COPYOUT_FROM | UPL_NO_SYNC | UPL_CLEAN_IN_PLACE | UPL_SET_INTERNAL | UPL_SET_LITE | UPL_SET_IO_WIRE; - // LP64todo - fix this! kret = vm_map_get_upl(current_map(), (vm_map_offset_t)(iov_base & ~((user_addr_t)PAGE_MASK)), &upl_size, @@ -1605,13 +2014,13 @@ cluster_nocopy_write(vnode_t vp, struct uio *uio, off_t newEOF) KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_END, 0, 0, 0, kret, 0); /* - * cluster_nocopy_write: failed to get pagelist + * 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; + goto wait_for_dwrites; } pl = UPL_GET_INTERNAL_PAGE_LIST(upl); pages_in_pl = upl_size / PAGE_SIZE; @@ -1627,8 +2036,7 @@ cluster_nocopy_write(vnode_t vp, struct uio *uio, off_t newEOF) * 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); + ubc_upl_abort(upl, 0); } if (force_data_sync >= 3) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_END, @@ -1641,28 +2049,31 @@ cluster_nocopy_write(vnode_t vp, struct uio *uio, off_t newEOF) * off as async requests... we need to wait for the I/O * to complete before returning */ - goto wait_for_writes; + goto wait_for_dwrites; } /* * 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 (upl_size < upl_needed_size) { + if (upl_size && upl_offset == 0) + io_size = upl_size; + else + io_size = 0; + } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 76)) | DBG_FUNC_END, (int)upl_offset, upl_size, (int)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); + ubc_upl_abort(upl, 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_writes; + goto wait_for_dwrites; } + /* * Now look for pages already in the cache * and throw them away. @@ -1679,9 +2090,16 @@ cluster_nocopy_write(vnode_t vp, struct uio *uio, off_t newEOF) */ lck_mtx_lock(cl_mtxp); - while ((iostate.io_issued - iostate.io_completed) > (2 * MAX_UPL_TRANSFER * PAGE_SIZE)) { + while ((iostate.io_issued - iostate.io_completed) > (2 * max_upl_size)) { + + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 95)) | DBG_FUNC_START, + iostate.io_issued, iostate.io_completed, 2 * max_upl_size, 0, 0); + iostate.io_wanted = 1; - msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_nocopy_write", 0); + msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_write_direct", NULL); + + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 95)) | DBG_FUNC_END, + iostate.io_issued, iostate.io_completed, 2 * max_upl_size, 0, 0); } lck_mtx_unlock(cl_mtxp); @@ -1693,91 +2111,132 @@ cluster_nocopy_write(vnode_t vp, struct uio *uio, off_t newEOF) * 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); + ubc_upl_abort(upl, 0); - goto wait_for_writes; + goto wait_for_dwrites; } - io_flag = CL_ASYNC | CL_PRESERVE | CL_COMMIT | CL_THROTTLE; + io_flag = CL_ASYNC | CL_PRESERVE | CL_COMMIT | CL_THROTTLE | CL_DIRECT_IO | bflag; 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, io_flag, (buf_t)NULL, &iostate); + retval = cluster_io(vp, upl, upl_offset, uio->uio_offset, + io_size, io_flag, (buf_t)NULL, &iostate, callback, callback_arg); + /* + * update the uio structure to + * reflect the I/O that we just issued + */ uio_update(uio, (user_size_t)io_size); + io_req_size -= io_size; + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 77)) | DBG_FUNC_END, - (int)upl_offset, (int)uio->uio_offset, (int)uio_resid(uio), error, 0); + (int)upl_offset, (int)uio->uio_offset, io_req_size, retval, 0); + + } /* end while */ + + if (retval == 0 && iostate.io_error == 0 && io_req_size == 0) { + + retval = cluster_io_type(uio, write_type, write_length, MIN_DIRECT_WRITE_SIZE); + + if (retval == 0 && *write_type == IO_DIRECT) { + + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 75)) | DBG_FUNC_NONE, + (int)uio->uio_offset, *write_length, (int)newEOF, 0, 0); + + goto next_dwrite; + } + } - } /* end while */ +wait_for_dwrites: + if (iostate.io_issued) { + /* + * make sure all async writes issued as part of this stream + * have completed before we return + */ + lck_mtx_lock(cl_mtxp); -wait_for_writes: - /* - * make sure all async writes issued as part of this stream - * have completed before we return - */ - lck_mtx_lock(cl_mtxp); + while (iostate.io_issued != iostate.io_completed) { + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 95)) | DBG_FUNC_START, + iostate.io_issued, iostate.io_completed, 0, 0, 0); - while (iostate.io_issued != iostate.io_completed) { - iostate.io_wanted = 1; - msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_nocopy_write", 0); - } - lck_mtx_unlock(cl_mtxp); + iostate.io_wanted = 1; + msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_write_direct", NULL); + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 95)) | DBG_FUNC_END, + iostate.io_issued, iostate.io_completed, 0, 0, 0); + } + lck_mtx_unlock(cl_mtxp); + } if (iostate.io_error) - error = iostate.io_error; + retval = iostate.io_error; + + if (io_req_size && retval == 0) { + /* + * we couldn't handle the tail of this request in DIRECT mode + * so fire it through the copy path + * + * note that flags will never have IO_HEADZEROFILL or IO_TAILZEROFILL set + * so we can just pass 0 in for the headOff and tailOff + */ + retval = cluster_write_copy(vp, uio, io_req_size, oldEOF, newEOF, (off_t)0, (off_t)0, flags, callback, callback_arg); + *write_type = IO_UNKNOWN; + } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 75)) | DBG_FUNC_END, - (int)uio->uio_offset, (int)uio->uio_resid, error, 4, 0); + (int)uio->uio_offset, io_req_size, retval, 4, 0); - return (error); + return (retval); } static int -cluster_phys_write(vnode_t vp, struct uio *uio, off_t newEOF) +cluster_write_contig(vnode_t vp, struct uio *uio, off_t newEOF, int *write_type, u_int32_t *write_length, + int (*callback)(buf_t, void *), void *callback_arg, int bflag) { upl_page_info_t *pl; - addr64_t src_paddr; - upl_t upl; + addr64_t src_paddr = 0; + upl_t upl[MAX_VECTS]; vm_offset_t upl_offset; - int tail_size; - int io_size; - int upl_size; - int upl_needed_size; - int pages_in_pl; + u_int32_t tail_size = 0; + u_int32_t io_size; + u_int32_t xsize; + vm_size_t upl_size; + vm_size_t upl_needed_size; + mach_msg_type_number_t pages_in_pl; int upl_flags; kern_return_t kret; + struct clios iostate; int error = 0; + int cur_upl = 0; + int num_upl = 0; + int n; user_addr_t iov_base; - int devblocksize; - struct cl_writebehind *wbp; + u_int32_t devblocksize; + u_int32_t mem_alignment_mask; - devblocksize = vp->v_mount->mnt_devblocksize; /* * When we enter this routine, we know - * -- the resid will not exceed iov_len - * -- the vector target address is physcially contiguous + * -- the io_req_size will not exceed iov_len + * -- the target address is physically contiguous */ - if ((wbp = cluster_get_wbp(vp, CLW_RETURNLOCKED)) != NULL) { + cluster_syncup(vp, newEOF, callback, callback_arg); - cluster_try_push(wbp, vp, newEOF, 0, 1); + devblocksize = (u_int32_t)vp->v_mount->mnt_devblocksize; + mem_alignment_mask = (u_int32_t)vp->v_mount->mnt_alignmentmask; - lck_mtx_unlock(&wbp->cl_lockw); - } -#if LP64_DEBUG - if (IS_VALID_UIO_SEGFLG(uio->uio_segflg) == 0) { - panic("%s :%d - invalid uio_segflg\n", __FILE__, __LINE__); - } -#endif /* LP64_DEBUG */ + iostate.io_completed = 0; + iostate.io_issued = 0; + iostate.io_error = 0; + iostate.io_wanted = 0; + +next_cwrite: + io_size = *write_length; - // LP64todo - fix this! - io_size = (int)uio_curriovlen(uio); iov_base = uio_curriovbase(uio); - upl_offset = CAST_DOWN(upl_offset_t, iov_base) & PAGE_MASK; + upl_offset = (vm_offset_t)((u_int32_t)iov_base & PAGE_MASK); upl_needed_size = upl_offset + io_size; pages_in_pl = 0; @@ -1785,88 +2244,179 @@ cluster_phys_write(vnode_t vp, struct uio *uio, off_t newEOF) upl_flags = UPL_FILE_IO | UPL_COPYOUT_FROM | UPL_NO_SYNC | UPL_CLEAN_IN_PLACE | UPL_SET_INTERNAL | UPL_SET_LITE | UPL_SET_IO_WIRE; - // LP64todo - fix this! kret = vm_map_get_upl(current_map(), (vm_map_offset_t)(iov_base & ~((user_addr_t)PAGE_MASK)), - &upl_size, &upl, NULL, &pages_in_pl, &upl_flags, 0); + &upl_size, &upl[cur_upl], NULL, &pages_in_pl, &upl_flags, 0); if (kret != KERN_SUCCESS) { /* - * cluster_phys_write: failed to get pagelist - * note: return kret here + * failed to get pagelist */ - return(EINVAL); + error = EINVAL; + goto wait_for_cwrites; } + num_upl++; + /* * Consider the possibility that upl_size wasn't satisfied. - * This is a failure in the physical memory case. */ if (upl_size < upl_needed_size) { - ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); - return(EINVAL); + /* + * This is a failure in the physical memory case. + */ + error = EINVAL; + goto wait_for_cwrites; } - pl = ubc_upl_pageinfo(upl); + pl = ubc_upl_pageinfo(upl[cur_upl]); src_paddr = ((addr64_t)upl_phys_page(pl, 0) << 12) + (addr64_t)upl_offset; while (((uio->uio_offset & (devblocksize - 1)) || io_size < devblocksize) && io_size) { - int head_size; + u_int32_t head_size; - head_size = devblocksize - (int)(uio->uio_offset & (devblocksize - 1)); + head_size = devblocksize - (u_int32_t)(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, 0); + error = cluster_align_phys_io(vp, uio, src_paddr, head_size, 0, callback, callback_arg); - if (error) { - ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); + if (error) + goto wait_for_cwrites; - return(EINVAL); - } upl_offset += head_size; src_paddr += head_size; io_size -= head_size; + + iov_base += head_size; + } + if ((u_int32_t)iov_base & mem_alignment_mask) { + /* + * request doesn't set up on a memory boundary + * the underlying DMA engine can handle... + * return an error instead of going through + * the slow copy path since the intent of this + * path is direct I/O from device memory + */ + error = EINVAL; + goto wait_for_cwrites; } + tail_size = io_size & (devblocksize - 1); io_size -= tail_size; - if (io_size) { - /* - * issue a synchronous write to cluster_io + while (io_size && error == 0) { + + if (io_size > MAX_IO_CONTIG_SIZE) + xsize = MAX_IO_CONTIG_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 writes + * wait until some have completed before issuing the next */ - error = cluster_io(vp, upl, upl_offset, uio->uio_offset, - io_size, CL_DEV_MEMORY, (buf_t)NULL, (struct clios *)NULL); - } - if (error == 0) { + if (iostate.io_issued) { + lck_mtx_lock(cl_mtxp); + + while ((iostate.io_issued - iostate.io_completed) > (2 * MAX_IO_CONTIG_SIZE)) { + + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 95)) | DBG_FUNC_START, + iostate.io_issued, iostate.io_completed, 2 * MAX_IO_CONTIG_SIZE, 0, 0); + + iostate.io_wanted = 1; + msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_write_contig", NULL); + + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 95)) | DBG_FUNC_END, + iostate.io_issued, iostate.io_completed, 2 * MAX_IO_CONTIG_SIZE, 0, 0); + } + lck_mtx_unlock(cl_mtxp); + } + if (iostate.io_error) { + /* + * one of the earlier writes we issued ran into a hard error + * don't issue any more writes... + * go wait for all writes that are part of this stream + * to complete before returning the error to the caller + */ + goto wait_for_cwrites; + } /* - * The cluster_io write completed successfully, - * update the uio structure + * issue an asynchronous write to cluster_io */ - uio_update(uio, (user_size_t)io_size); + error = cluster_io(vp, upl[cur_upl], upl_offset, uio->uio_offset, + xsize, CL_DEV_MEMORY | CL_ASYNC | bflag, (buf_t)NULL, (struct clios *)&iostate, callback, callback_arg); - src_paddr += io_size; + if (error == 0) { + /* + * The cluster_io write completed successfully, + * update the uio structure + */ + uio_update(uio, (user_size_t)xsize); - if (tail_size) - error = cluster_align_phys_io(vp, uio, src_paddr, tail_size, 0); + upl_offset += xsize; + src_paddr += xsize; + io_size -= xsize; + } } + if (error == 0 && iostate.io_error == 0 && tail_size == 0 && num_upl < MAX_VECTS) { + + error = cluster_io_type(uio, write_type, write_length, 0); + + if (error == 0 && *write_type == IO_CONTIG) { + cur_upl++; + goto next_cwrite; + } + } else + *write_type = IO_UNKNOWN; + +wait_for_cwrites: /* - * 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); + * make sure all async writes that are part of this stream + * have completed before we proceed + */ + lck_mtx_lock(cl_mtxp); + + while (iostate.io_issued != iostate.io_completed) { + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 95)) | DBG_FUNC_START, + iostate.io_issued, iostate.io_completed, 0, 0, 0); + + iostate.io_wanted = 1; + msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_write_contig", NULL); + + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 95)) | DBG_FUNC_END, + iostate.io_issued, iostate.io_completed, 0, 0, 0); + } + lck_mtx_unlock(cl_mtxp); + + if (iostate.io_error) + error = iostate.io_error; + + if (error == 0 && tail_size) + error = cluster_align_phys_io(vp, uio, src_paddr, tail_size, 0, callback, callback_arg); + + for (n = 0; n < num_upl; n++) + /* + * just release our hold on each physically contiguous + * region without changing any state + */ + ubc_upl_abort(upl[n], 0); return (error); } static int -cluster_write_x(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t headOff, off_t tailOff, int flags) +cluster_write_copy(vnode_t vp, struct uio *uio, u_int32_t io_req_size, off_t oldEOF, off_t newEOF, off_t headOff, + off_t tailOff, int flags, int (*callback)(buf_t, void *), void *callback_arg) { upl_page_info_t *pl; upl_t upl; vm_offset_t upl_offset = 0; - int upl_size; + vm_size_t upl_size; off_t upl_f_offset; int pages_in_upl; int start_offset; @@ -1884,38 +2434,21 @@ cluster_write_x(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t h long long zero_cnt1; off_t zero_off1; struct cl_extent cl; - int intersection; struct cl_writebehind *wbp; + int bflag; + u_int max_cluster_pgcount; + u_int max_io_size; - if ((wbp = cluster_get_wbp(vp, 0)) != NULL) - { - if (wbp->cl_hasbeenpaged) { - /* - * this vnode had pages cleaned to it by - * the pager which indicates that either - * it's not very 'hot', or the system is - * being overwhelmed by a lot of dirty - * data being delayed in the VM cache... - * in either event, we'll push our remaining - * delayed data at this point... this will - * be more efficient than paging out 1 page at - * a time, and will also act as a throttle - * by delaying this client from writing any - * more data until all his delayed data has - * at least been queued to the uderlying driver. - */ - if (wbp->cl_number || wbp->cl_scmap) - cluster_push_EOF(vp, newEOF); + if (flags & IO_PASSIVE) + bflag = CL_PASSIVE; + else + bflag = 0; - wbp->cl_hasbeenpaged = 0; - } - } if (uio) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 40)) | DBG_FUNC_START, - (int)uio->uio_offset, uio_resid(uio), (int)oldEOF, (int)newEOF, 0); + (int)uio->uio_offset, io_req_size, (int)oldEOF, (int)newEOF, 0); - // LP64todo - fix this - io_resid = uio_resid(uio); + io_resid = io_req_size; } else { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 40)) | DBG_FUNC_START, 0, 0, (int)oldEOF, (int)newEOF, 0); @@ -1927,6 +2460,9 @@ cluster_write_x(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t h zero_off = 0; zero_off1 = 0; + max_cluster_pgcount = MAX_CLUSTER_SIZE(vp) / PAGE_SIZE; + max_io_size = cluster_max_io_size(vp->v_mount, CL_WRITE); + if (flags & IO_HEADZEROFILL) { /* * some filesystems (HFS is one) don't support unallocated holes within a file... @@ -1947,8 +2483,7 @@ cluster_write_x(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t h } if (flags & IO_TAILZEROFILL) { if (uio) { - // LP64todo - fix this - zero_off1 = uio->uio_offset + uio_resid(uio); + zero_off1 = uio->uio_offset + io_req_size; if (zero_off1 < tailOff) zero_cnt1 = tailOff - zero_off1; @@ -1977,26 +2512,26 @@ cluster_write_x(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t h 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; + if (total_size > max_io_size) + total_size = max_io_size; cl.b_addr = (daddr64_t)(upl_f_offset / PAGE_SIZE_64); - if (uio && ((flags & (IO_NOCACHE | IO_SYNC | IO_HEADZEROFILL | IO_TAILZEROFILL)) == 0)) { + if (uio && ((flags & (IO_SYNC | IO_HEADZEROFILL | IO_TAILZEROFILL)) == 0)) { /* * assumption... total_size <= io_resid * because IO_HEADZEROFILL and IO_TAILZEROFILL not set */ - if ((start_offset + total_size) > (MAX_UPL_TRANSFER * PAGE_SIZE)) + if ((start_offset + total_size) > max_io_size) total_size -= start_offset; xfer_resid = total_size; - retval = cluster_copy_ubc_data(vp, uio, &xfer_resid, 1); + retval = cluster_copy_ubc_data_internal(vp, uio, &xfer_resid, 1, 1); if (retval) break; - io_resid -= (total_size - xfer_resid); + io_resid -= (total_size - xfer_resid); total_size = xfer_resid; start_offset = (int)(uio->uio_offset & PAGE_MASK_64); upl_f_offset = uio->uio_offset - start_offset; @@ -2028,8 +2563,8 @@ cluster_write_x(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t h */ 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; + if (upl_size > max_io_size) + upl_size = max_io_size; pages_in_upl = upl_size / PAGE_SIZE; io_size = upl_size - start_offset; @@ -2052,7 +2587,7 @@ cluster_write_x(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t h &pl, UPL_SET_LITE | UPL_WILL_MODIFY); if (kret != KERN_SUCCESS) - panic("cluster_write: failed to get pagelist"); + panic("cluster_write_copy: failed to get pagelist"); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 41)) | DBG_FUNC_END, (int)upl, (int)upl_f_offset, start_offset, 0, 0); @@ -2071,7 +2606,7 @@ cluster_write_x(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t h read_size = newEOF - upl_f_offset; retval = cluster_io(vp, upl, 0, upl_f_offset, read_size, - CL_READ, (buf_t)NULL, (struct clios *)NULL); + CL_READ | bflag, (buf_t)NULL, (struct clios *)NULL, callback, callback_arg); if (retval) { /* * we had an error during the read which causes us to abort @@ -2079,7 +2614,7 @@ cluster_write_x(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t h * 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, PAGE_SIZE, UPL_ABORT_DUMP_PAGES|UPL_ABORT_FREE_ON_EMPTY); if (upl_size > PAGE_SIZE) ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); @@ -2107,7 +2642,7 @@ cluster_write_x(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t h read_size = newEOF - (upl_f_offset + upl_offset); retval = cluster_io(vp, upl, upl_offset, upl_f_offset + upl_offset, read_size, - CL_READ, (buf_t)NULL, (struct clios *)NULL); + CL_READ | bflag, (buf_t)NULL, (struct clios *)NULL, callback, callback_arg); if (retval) { /* * we had an error during the read which causes us to abort @@ -2115,7 +2650,7 @@ cluster_write_x(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t h * 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, upl_offset, PAGE_SIZE, UPL_ABORT_DUMP_PAGES|UPL_ABORT_FREE_ON_EMPTY); if (upl_size > PAGE_SIZE) ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); @@ -2158,9 +2693,12 @@ cluster_write_x(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t h io_offset += bytes_to_zero; } if (xfer_resid && io_resid) { + u_int32_t io_requested; + bytes_to_move = min(io_resid, xfer_resid); + io_requested = bytes_to_move; - retval = cluster_copy_upl_data(uio, upl, io_offset, bytes_to_move); + retval = cluster_copy_upl_data(uio, upl, io_offset, (int *)&io_requested); if (retval) { @@ -2169,7 +2707,7 @@ cluster_write_x(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t h KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 45)) | DBG_FUNC_NONE, (int)upl, 0, 0, retval, 0); } else { - io_resid -= bytes_to_move; + io_resid -= bytes_to_move; xfer_resid -= bytes_to_move; io_offset += bytes_to_move; } @@ -2204,11 +2742,11 @@ cluster_write_x(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t h if (retval == 0) { int cl_index; - int can_delay; + int ret_cluster_try_push; io_size += start_offset; - if ((upl_f_offset + io_size) >= newEOF && io_size < upl_size) { + if ((upl_f_offset + io_size) >= newEOF && (u_int)io_size < upl_size) { /* * if we're extending the file with this write * we'll zero fill the rest of the page so that @@ -2217,6 +2755,33 @@ cluster_write_x(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t h */ cluster_zero(upl, io_size, upl_size - io_size, NULL); } + /* + * release the upl now if we hold one since... + * 1) pages in it may be present in the sparse cluster map + * and may span 2 separate buckets there... if they do and + * we happen to have to flush a bucket to make room and it intersects + * this upl, a deadlock may result on page BUSY + * 2) we're delaying the I/O... from this point forward we're just updating + * the cluster state... no need to hold the pages, so commit them + * 3) IO_SYNC is set... + * because we had to ask for a UPL that provides currenty non-present pages, the + * UPL has been automatically set to clear the dirty flags (both software and hardware) + * upon committing it... this is not the behavior we want since it's possible for + * pages currently present as part of a mapped file to be dirtied while the I/O is in flight. + * we'll pick these pages back up later with the correct behavior specified. + * 4) we don't want to hold pages busy in a UPL and then block on the cluster lock... if a flush + * of this vnode is in progress, we will deadlock if the pages being flushed intersect the pages + * we hold since the flushing context is holding the cluster lock. + */ + ubc_upl_commit_range(upl, 0, upl_size, + UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY); +check_cluster: + /* + * calculate the last logical block number + * that this delayed I/O encompassed + */ + cl.e_addr = (daddr64_t)((upl_f_offset + (off_t)upl_size) / PAGE_SIZE_64); + if (flags & IO_SYNC) /* * if the IO_SYNC flag is set than we need to @@ -2224,36 +2789,21 @@ cluster_write_x(vnode_t vp, struct uio *uio, off_t oldEOF, off_t newEOF, off_t h * the I/O */ goto issue_io; -check_cluster: + /* * take the lock to protect our accesses * of the writebehind and sparse cluster state */ wbp = cluster_get_wbp(vp, CLW_ALLOCATE | CLW_RETURNLOCKED); - /* - * calculate the last logical block number - * that this delayed I/O encompassed - */ - cl.e_addr = (daddr64_t)((upl_f_offset + (off_t)upl_size) / PAGE_SIZE_64); - if (wbp->cl_scmap) { if ( !(flags & IO_NOCACHE)) { /* * we've fallen into the sparse * cluster method of delaying dirty pages - * first, we need to release the upl if we hold one - * since pages in it may be present in the sparse cluster map - * and may span 2 separate buckets there... if they do and - * we happen to have to flush a bucket to make room and it intersects - * this upl, a deadlock may result on page BUSY */ - if (upl_size) - ubc_upl_commit_range(upl, 0, upl_size, - UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY); - - sparse_cluster_add(wbp, vp, &cl, newEOF); + sparse_cluster_add(wbp, vp, &cl, newEOF, callback, callback_arg); lck_mtx_unlock(&wbp->cl_lockw); @@ -2265,21 +2815,10 @@ check_cluster: * to uncached writes on the file, so go ahead * and push whatever's in the sparse map * and switch back to normal clustering - * - * see the comment above concerning a possible deadlock... */ - if (upl_size) { - ubc_upl_commit_range(upl, 0, upl_size, - UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY); - /* - * setting upl_size to 0 keeps us from committing a - * second time in the start_new_cluster path - */ - upl_size = 0; - } - sparse_cluster_push(wbp, vp, newEOF, 1); - wbp->cl_number = 0; + + sparse_cluster_push(wbp, vp, newEOF, PUSH_ALL, callback, callback_arg); /* * no clusters of either type present at this point * so just go directly to start_new_cluster since @@ -2289,8 +2828,6 @@ check_cluster: */ goto start_new_cluster; } - upl_offset = 0; - if (wbp->cl_number == 0) /* * no clusters currently present @@ -2309,7 +2846,7 @@ check_cluster: /* * the current write starts at or after the current cluster */ - if (cl.e_addr <= (wbp->cl_clusters[cl_index].b_addr + MAX_UPL_TRANSFER)) { + if (cl.e_addr <= (wbp->cl_clusters[cl_index].b_addr + max_cluster_pgcount)) { /* * we have a write that fits entirely * within the existing cluster limits @@ -2321,7 +2858,7 @@ check_cluster: wbp->cl_clusters[cl_index].e_addr = cl.e_addr; break; } - if (cl.b_addr < (wbp->cl_clusters[cl_index].b_addr + MAX_UPL_TRANSFER)) { + if (cl.b_addr < (wbp->cl_clusters[cl_index].b_addr + max_cluster_pgcount)) { /* * we have a write that starts in the middle of the current cluster * but extends beyond the cluster's limit... we know this because @@ -2332,23 +2869,8 @@ check_cluster: * note that we'll always have a leftover tail in this case since * full absorbtion would have occurred in the clause above */ - wbp->cl_clusters[cl_index].e_addr = wbp->cl_clusters[cl_index].b_addr + MAX_UPL_TRANSFER; - - if (upl_size) { - daddr64_t start_pg_in_upl; - - start_pg_in_upl = (daddr64_t)(upl_f_offset / PAGE_SIZE_64); - - if (start_pg_in_upl < wbp->cl_clusters[cl_index].e_addr) { - intersection = (int)((wbp->cl_clusters[cl_index].e_addr - start_pg_in_upl) * PAGE_SIZE); - - ubc_upl_commit_range(upl, upl_offset, intersection, - UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY); - upl_f_offset += intersection; - upl_offset += intersection; - upl_size -= intersection; - } - } + wbp->cl_clusters[cl_index].e_addr = wbp->cl_clusters[cl_index].b_addr + max_cluster_pgcount; + cl.b_addr = wbp->cl_clusters[cl_index].e_addr; } /* @@ -2363,7 +2885,7 @@ check_cluster: /* * the current write starts in front of the cluster we're currently considering */ - if ((wbp->cl_clusters[cl_index].e_addr - cl.b_addr) <= MAX_UPL_TRANSFER) { + if ((wbp->cl_clusters[cl_index].e_addr - cl.b_addr) <= max_cluster_pgcount) { /* * we can just merge the new request into * this cluster and leave it in the cache @@ -2376,7 +2898,7 @@ check_cluster: /* * the current write completely * envelops the existing cluster and since - * each write is limited to at most MAX_UPL_TRANSFER bytes + * each write is limited to at most max_cluster_pgcount pages * we can just use the start and last blocknos of the write * to generate the cluster limits */ @@ -2394,29 +2916,14 @@ check_cluster: * get an intersection with the current write * */ - if (cl.e_addr > wbp->cl_clusters[cl_index].e_addr - MAX_UPL_TRANSFER) { + if (cl.e_addr > wbp->cl_clusters[cl_index].e_addr - max_cluster_pgcount) { /* * the current write extends into the proposed cluster * clip the length of the current write after first combining it's * tail with the newly shaped cluster */ - wbp->cl_clusters[cl_index].b_addr = wbp->cl_clusters[cl_index].e_addr - MAX_UPL_TRANSFER; - - if (upl_size) { - intersection = (int)((cl.e_addr - wbp->cl_clusters[cl_index].b_addr) * PAGE_SIZE); - - if (intersection > upl_size) - /* - * because the current write may consist of a number of pages found in the cache - * which are not part of the UPL, we may have an intersection that exceeds - * the size of the UPL that is also part of this write - */ - intersection = upl_size; - - ubc_upl_commit_range(upl, upl_offset + (upl_size - intersection), intersection, - UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY); - upl_size -= intersection; - } + wbp->cl_clusters[cl_index].b_addr = wbp->cl_clusters[cl_index].e_addr - max_cluster_pgcount; + cl.e_addr = wbp->cl_clusters[cl_index].b_addr; } /* @@ -2435,7 +2942,7 @@ check_cluster: */ goto delay_io; - if (wbp->cl_number < MAX_CLUSTERS && !(flags & IO_NOCACHE)) + if (wbp->cl_number < MAX_CLUSTERS) /* * we didn't find an existing cluster to * merge into, but there's room to start @@ -2453,35 +2960,27 @@ check_cluster: * number of remaining clusters... and * returns the number of currently unused clusters */ - int ret_cluster_try_push = 0; - /* if writes are not deferred, call cluster push immediately */ + ret_cluster_try_push = 0; + + /* + * if writes are not deferred, call cluster push immediately + */ if (!((unsigned int)vfs_flags(vp->v_mount) & MNT_DEFWRITE)) { - if (flags & IO_NOCACHE) - can_delay = 0; - else - can_delay = 1; - ret_cluster_try_push = cluster_try_push(wbp, vp, newEOF, can_delay, 0); + ret_cluster_try_push = cluster_try_push(wbp, vp, newEOF, (flags & IO_NOCACHE) ? 0 : PUSH_DELAY, callback, callback_arg); } - /* execute following regardless writes are deferred or not */ + /* + * execute following regardless of writes being deferred or not + */ if (ret_cluster_try_push == 0) { /* * no more room in the normal cluster mechanism * so let's switch to the more expansive but expensive * sparse mechanism.... - * first, we need to release the upl if we hold one - * since pages in it may be present in the sparse cluster map (after the cluster_switch) - * and may span 2 separate buckets there... if they do and - * we happen to have to flush a bucket to make room and it intersects - * this upl, a deadlock may result on page BUSY */ - if (upl_size) - ubc_upl_commit_range(upl, upl_offset, upl_size, - UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY); - - sparse_cluster_switch(wbp, vp, newEOF); - sparse_cluster_add(wbp, vp, &cl, newEOF); + sparse_cluster_switch(wbp, vp, newEOF, callback, callback_arg); + sparse_cluster_add(wbp, vp, &cl, newEOF, callback, callback_arg); lck_mtx_unlock(&wbp->cl_lockw); @@ -2490,226 +2989,144 @@ check_cluster: /* * we pushed one cluster successfully, so we must be sequentially writing this file * otherwise, we would have failed and fallen into the sparse cluster support - * so let's take the opportunity to push out additional clusters as long as we - * remain below the throttle... this will give us better I/O locality if we're - * in a copy loop (i.e. we won't jump back and forth between the read and write points - * however, we don't want to push so much out that the write throttle kicks in and - * hangs this thread up until some of the I/O completes... + * so let's take the opportunity to push out additional clusters... + * this will give us better I/O locality if we're in a copy loop + * (i.e. we won't jump back and forth between the read and write points */ if (!((unsigned int)vfs_flags(vp->v_mount) & MNT_DEFWRITE)) { - while (wbp->cl_number && (vp->v_numoutput <= (VNODE_ASYNC_THROTTLE / 2))) - cluster_try_push(wbp, vp, newEOF, 0, 0); + while (wbp->cl_number) + cluster_try_push(wbp, vp, newEOF, 0, callback, callback_arg); } start_new_cluster: wbp->cl_clusters[wbp->cl_number].b_addr = cl.b_addr; wbp->cl_clusters[wbp->cl_number].e_addr = cl.e_addr; + wbp->cl_clusters[wbp->cl_number].io_flags = 0; + if (flags & IO_NOCACHE) - wbp->cl_clusters[wbp->cl_number].io_nocache = 1; - else - wbp->cl_clusters[wbp->cl_number].io_nocache = 0; + wbp->cl_clusters[wbp->cl_number].io_flags |= CLW_IONOCACHE; + + if (bflag & CL_PASSIVE) + wbp->cl_clusters[wbp->cl_number].io_flags |= CLW_IOPASSIVE; + wbp->cl_number++; delay_io: - if (upl_size) - ubc_upl_commit_range(upl, upl_offset, upl_size, - UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY); - lck_mtx_unlock(&wbp->cl_lockw); continue; issue_io: /* - * we don't hold the vnode lock at this point + * we don't hold the lock at this point * - * because we had to ask for a UPL that provides currenty non-present pages, the - * UPL has been automatically set to clear the dirty flags (both software and hardware) - * upon committing it... this is not the behavior we want since it's possible for - * pages currently present as part of a mapped file to be dirtied while the I/O is in flight. - * in order to maintain some semblance of coherency with mapped writes - * we need to drop the current upl and pick it back up with COPYOUT_FROM set + * we've already dropped the current upl, so pick it back up with COPYOUT_FROM set * so that we correctly deal with a change in state of the hardware modify bit... - * we do this via cluster_push_x... by passing along the IO_SYNC flag, we force - * cluster_push_x to wait until all the I/Os have completed... cluster_push_x is also + * we do this via cluster_push_now... by passing along the IO_SYNC flag, we force + * cluster_push_now to wait until all the I/Os have completed... cluster_push_now is also * responsible for generating the correct sized I/O(s) */ - ubc_upl_commit_range(upl, 0, upl_size, - UPL_COMMIT_SET_DIRTY | UPL_COMMIT_INACTIVATE | UPL_COMMIT_FREE_ON_EMPTY); - - cl.e_addr = (upl_f_offset + (off_t)upl_size) / PAGE_SIZE_64; - - retval = cluster_push_x(vp, &cl, newEOF, flags); + retval = cluster_push_now(vp, &cl, newEOF, flags, callback, callback_arg); } } - KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 40)) | DBG_FUNC_END, - retval, 0, io_resid, 0, 0); + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 40)) | DBG_FUNC_END, retval, 0, io_resid, 0, 0); return (retval); } + + int cluster_read(vnode_t vp, struct uio *uio, off_t filesize, int xflags) { - int prev_resid; - u_int clip_size; - off_t max_io_size; - int upl_size; - int upl_flags; - upl_t upl; - int retval = 0; - int flags; + return cluster_read_ext(vp, uio, filesize, xflags, NULL, NULL); +} + + +int +cluster_read_ext(vnode_t vp, struct uio *uio, off_t filesize, int xflags, int (*callback)(buf_t, void *), void *callback_arg) +{ + int retval = 0; + int flags; + user_ssize_t cur_resid; + u_int32_t io_size; + u_int32_t read_length = 0; + int read_type = IO_COPY; flags = xflags; if (vp->v_flag & VNOCACHE_DATA) flags |= IO_NOCACHE; - if (vp->v_flag & VRAOFF) + if ((vp->v_flag & VRAOFF) || speculative_reads_disabled) flags |= IO_RAOFF; - if (!((flags & IO_NOCACHE) && UIO_SEG_IS_USER_SPACE(uio->uio_segflg))) { - /* - * go do a read through the cache if one of the following is true.... - * NOCACHE is not true - * the uio request doesn't target USERSPACE - */ - return (cluster_read_x(vp, uio, filesize, flags)); - } - -#if LP64_DEBUG - if (IS_VALID_UIO_SEGFLG(uio->uio_segflg) == 0) { - panic("%s :%d - invalid uio_segflg\n", __FILE__, __LINE__); - } -#endif /* LP64_DEBUG */ - - while (uio_resid(uio) && uio->uio_offset < filesize && retval == 0) { - user_size_t iov_len; - user_addr_t iov_base; - - /* - * we know we have a resid, so this is safe - * skip over any emtpy vectors - */ - uio_update(uio, (user_size_t)0); + /* + * do a read through the cache if one of the following is true.... + * NOCACHE is not true + * the uio request doesn't target USERSPACE + * otherwise, find out if we want the direct or contig variant for + * the first vector in the uio request + */ + if ( (flags & IO_NOCACHE) && UIO_SEG_IS_USER_SPACE(uio->uio_segflg) ) + retval = cluster_io_type(uio, &read_type, &read_length, 0); - iov_len = uio_curriovlen(uio); - iov_base = uio_curriovbase(uio); + while ((cur_resid = uio_resid(uio)) && uio->uio_offset < filesize && retval == 0) { - upl_size = PAGE_SIZE; - upl_flags = UPL_QUERY_OBJECT_TYPE; - - // LP64todo - fix this! - if ((vm_map_get_upl(current_map(), - (vm_map_offset_t)(iov_base & ~((user_addr_t)PAGE_MASK)), - &upl_size, &upl, NULL, NULL, &upl_flags, 0)) != KERN_SUCCESS) { + switch (read_type) { + + case IO_COPY: /* - * the user app must have passed in an invalid address + * make sure the uio_resid isn't too big... + * internally, we want to handle all of the I/O in + * chunk sizes that fit in a 32 bit int */ - return (EFAULT); - } + if (cur_resid > (user_ssize_t)(MAX_IO_REQUEST_SIZE)) + io_size = MAX_IO_REQUEST_SIZE; + else + io_size = (u_int32_t)cur_resid; - /* - * We check every vector target but if it is physically - * contiguous space, we skip the sanity checks. - */ - if (upl_flags & UPL_PHYS_CONTIG) { - retval = cluster_phys_read(vp, uio, filesize); - } - else if (uio_resid(uio) < PAGE_SIZE) { - /* - * we're here because we're don't have a physically contiguous target buffer - * go do a read through the cache if - * the total xfer size is less than a page... - */ - return (cluster_read_x(vp, uio, filesize, flags)); - } - // LP64todo - fix this! - else if (((int)uio->uio_offset & PAGE_MASK) || (CAST_DOWN(int, iov_base) & PAGE_MASK)) { - if (((int)uio->uio_offset & PAGE_MASK) == (CAST_DOWN(int, iov_base) & PAGE_MASK)) { - /* - * Bring the file offset read up to a pagesize boundary - * this will also bring the base address to a page boundary - * since they both are currently on the same offset within a page - * note: if we get here, uio->uio_resid is greater than PAGE_SIZE - * so the computed clip_size must always be less than the current uio_resid - */ - clip_size = (PAGE_SIZE - (int)(uio->uio_offset & PAGE_MASK_64)); - - /* - * Fake the resid going into the cluster_read_x call - * and restore it on the way out. - */ - prev_resid = uio_resid(uio); - // LP64todo - fix this - uio_setresid(uio, clip_size); - - retval = cluster_read_x(vp, uio, filesize, flags); - - uio_setresid(uio, prev_resid - (clip_size - uio_resid(uio))); - } else { - /* - * can't get both the file offset and the buffer offset aligned to a page boundary - * so fire an I/O through the cache for this entire vector - */ - // LP64todo - fix this! - clip_size = iov_len; - prev_resid = uio_resid(uio); - uio_setresid(uio, clip_size); - - retval = cluster_read_x(vp, uio, filesize, flags); - - uio_setresid(uio, prev_resid - (clip_size - uio_resid(uio))); - } - } 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; - // LP64todo - fix this - clip_size = uio_resid(uio); - if (iov_len < clip_size) - clip_size = 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. - */ - // LP64todo - fix this - prev_resid = uio_resid(uio); - uio_setresid(uio, clip_size); + retval = cluster_read_copy(vp, uio, io_size, filesize, flags, callback, callback_arg); + break; - retval = cluster_read_x(vp, uio, filesize, flags); + case IO_DIRECT: + retval = cluster_read_direct(vp, uio, filesize, &read_type, &read_length, flags, callback, callback_arg); + break; - uio_setresid(uio, prev_resid - (clip_size - uio_resid(uio))); - } else { - /* round clip_size down to a multiple of pagesize */ - clip_size = clip_size & ~(PAGE_MASK); - // LP64todo - fix this - prev_resid = uio_resid(uio); - uio_setresid(uio, clip_size); + case IO_CONTIG: + retval = cluster_read_contig(vp, uio, filesize, &read_type, &read_length, callback, callback_arg, flags); + break; + + case IO_UNKNOWN: + retval = cluster_io_type(uio, &read_type, &read_length, 0); + break; + } + } + return (retval); +} - retval = cluster_nocopy_read(vp, uio, filesize); - if ((retval==0) && uio_resid(uio)) - retval = cluster_read_x(vp, uio, filesize, flags); - uio_setresid(uio, prev_resid - (clip_size - uio_resid(uio))); - } - } /* end else */ - } /* end while */ +static void +cluster_read_upl_release(upl_t upl, int start_pg, int last_pg, int flags) +{ + int range; + int abort_flags = UPL_ABORT_FREE_ON_EMPTY; - return(retval); + if ((range = last_pg - start_pg)) { + if ( !(flags & IO_NOCACHE)) + abort_flags |= UPL_ABORT_REFERENCE; + + ubc_upl_abort_range(upl, start_pg * PAGE_SIZE, range * PAGE_SIZE, abort_flags); + } } + static int -cluster_read_x(vnode_t vp, struct uio *uio, off_t filesize, int flags) +cluster_read_copy(vnode_t vp, struct uio *uio, u_int32_t io_req_size, off_t filesize, int flags, int (*callback)(buf_t, void *), void *callback_arg) { upl_page_info_t *pl; upl_t upl; vm_offset_t upl_offset; - int upl_size; + u_int32_t upl_size; off_t upl_f_offset; int start_offset; int start_pg; @@ -2719,26 +3136,50 @@ cluster_read_x(vnode_t vp, struct uio *uio, off_t filesize, int flags) off_t max_size; off_t last_ioread_offset; off_t last_request_offset; - u_int size_of_prefetch; - u_int io_size; kern_return_t kret; int error = 0; int retval = 0; - u_int max_rd_size = MAX_UPL_TRANSFER * PAGE_SIZE; + u_int32_t size_of_prefetch; + u_int32_t xsize; + u_int32_t io_size; + u_int32_t max_rd_size; + u_int32_t max_io_size; + u_int32_t max_prefetch; u_int rd_ahead_enabled = 1; u_int prefetch_enabled = 1; struct cl_readahead * rap; struct clios iostate; struct cl_extent extent; + int bflag; + int take_reference = 1; + struct uthread *ut; + int policy = IOPOL_DEFAULT; + + policy = current_proc()->p_iopol_disk; + + ut = get_bsdthread_info(current_thread()); + + if (ut->uu_iopol_disk != IOPOL_DEFAULT) + policy = ut->uu_iopol_disk; + + if (policy == IOPOL_THROTTLE) + take_reference = 0; + + if (flags & IO_PASSIVE) + bflag = CL_PASSIVE; + else + bflag = 0; + + max_prefetch = MAX_PREFETCH(vp); + max_rd_size = max_prefetch; + max_io_size = cluster_max_io_size(vp->v_mount, CL_READ); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 32)) | DBG_FUNC_START, - (int)uio->uio_offset, uio_resid(uio), (int)filesize, 0, 0); + (int)uio->uio_offset, io_req_size, (int)filesize, flags, 0); - // LP64todo - fix this - last_request_offset = uio->uio_offset + uio_resid(uio); + last_request_offset = uio->uio_offset + io_req_size; - if ((flags & (IO_RAOFF|IO_NOCACHE)) || - ((last_request_offset & ~PAGE_MASK_64) == (uio->uio_offset & ~PAGE_MASK_64))) { + if ((flags & (IO_RAOFF|IO_NOCACHE)) || ((last_request_offset & ~PAGE_MASK_64) == (uio->uio_offset & ~PAGE_MASK_64))) { rd_ahead_enabled = 0; rap = NULL; } else { @@ -2773,7 +3214,7 @@ cluster_read_x(vnode_t vp, struct uio *uio, off_t filesize, int flags) } else last_ioread_offset = (off_t)0; - while (uio_resid(uio) && uio->uio_offset < filesize && retval == 0) { + while (io_req_size && uio->uio_offset < filesize && retval == 0) { /* * compute the size of the upl needed to encompass * the requested read... limit each call to cluster_io @@ -2786,21 +3227,20 @@ cluster_read_x(vnode_t vp, struct uio *uio, off_t filesize, int flags) upl_f_offset = uio->uio_offset - (off_t)start_offset; max_size = filesize - uio->uio_offset; - // LP64todo - fix this! - if ((off_t)((unsigned int)uio_resid(uio)) < max_size) - io_size = uio_resid(uio); + if ((off_t)(io_req_size) < max_size) + io_size = io_req_size; else io_size = max_size; if (!(flags & IO_NOCACHE)) { while (io_size) { - u_int io_resid; - u_int io_requested; + u_int32_t io_resid; + u_int32_t io_requested; /* * if we keep finding the pages we need already in the cache, then - * don't bother to call cluster_rd_prefetch since it costs CPU cycles + * don't bother to call cluster_read_prefetch since it costs CPU cycles * to determine that we have all the pages we need... once we miss in * the cache and have issued an I/O, than we'll assume that we're likely * to continue to miss in the cache and it's to our advantage to try and prefetch @@ -2817,7 +3257,7 @@ cluster_read_x(vnode_t vp, struct uio *uio, off_t filesize, int flags) if (size_of_prefetch > max_rd_size) size_of_prefetch = max_rd_size; - size_of_prefetch = cluster_rd_prefetch(vp, last_ioread_offset, size_of_prefetch, filesize); + size_of_prefetch = cluster_read_prefetch(vp, last_ioread_offset, size_of_prefetch, filesize, callback, callback_arg, bflag); last_ioread_offset += (off_t)(size_of_prefetch * PAGE_SIZE); @@ -2830,16 +3270,19 @@ cluster_read_x(vnode_t vp, struct uio *uio, off_t filesize, int flags) * we can notice that our I/O pipe is running dry and * get the next I/O issued before it does go dry */ - if (last_ioread_offset && io_size > ((MAX_UPL_TRANSFER * PAGE_SIZE) / 4)) - io_resid = ((MAX_UPL_TRANSFER * PAGE_SIZE) / 4); + if (last_ioread_offset && io_size > (max_io_size / 4)) + io_resid = (max_io_size / 4); else io_resid = io_size; io_requested = io_resid; - retval = cluster_copy_ubc_data(vp, uio, &io_resid, 0); + retval = cluster_copy_ubc_data_internal(vp, uio, (int *)&io_resid, 0, take_reference); - io_size -= (io_requested - io_resid); + xsize = io_requested - io_resid; + + io_size -= xsize; + io_req_size -= xsize; if (retval || io_resid) /* @@ -2854,7 +3297,7 @@ cluster_read_x(vnode_t vp, struct uio *uio, off_t filesize, int flags) * we're already finished the I/O for this read request * let's see if we should do a read-ahead */ - cluster_rd_ahead(vp, &extent, filesize, rap); + cluster_read_ahead(vp, &extent, filesize, rap, callback, callback_arg, bflag); } } if (retval) @@ -2876,8 +3319,13 @@ cluster_read_x(vnode_t vp, struct uio *uio, off_t filesize, int flags) upl_size = (start_offset + io_size + (PAGE_SIZE - 1)) & ~PAGE_MASK; - if (upl_size > (MAX_UPL_TRANSFER * PAGE_SIZE) / 4) - upl_size = (MAX_UPL_TRANSFER * PAGE_SIZE) / 4; + if (flags & IO_NOCACHE) { + if (upl_size > max_io_size) + upl_size = max_io_size; + } else { + if (upl_size > max_io_size / 4) + upl_size = max_io_size / 4; + } pages_in_upl = upl_size / PAGE_SIZE; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 33)) | DBG_FUNC_START, @@ -2888,9 +3336,9 @@ cluster_read_x(vnode_t vp, struct uio *uio, off_t filesize, int flags) upl_size, &upl, &pl, - UPL_SET_LITE); + UPL_FILE_IO | UPL_SET_LITE); if (kret != KERN_SUCCESS) - panic("cluster_read: failed to get pagelist"); + panic("cluster_read_copy: 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); @@ -2939,7 +3387,7 @@ cluster_read_x(vnode_t vp, struct uio *uio, off_t filesize, int flags) */ error = cluster_io(vp, upl, upl_offset, upl_f_offset + upl_offset, - io_size, CL_READ | CL_ASYNC, (buf_t)NULL, &iostate); + io_size, CL_READ | CL_ASYNC | bflag, (buf_t)NULL, &iostate, callback, callback_arg); } if (error == 0) { /* @@ -2954,8 +3402,19 @@ cluster_read_x(vnode_t vp, struct uio *uio, off_t filesize, int flags) if (!upl_valid_page(pl, uio_last)) break; } + 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 now, so that any prefetch/readahed can + * include them + */ + ubc_upl_abort_range(upl, uio_last * PAGE_SIZE, + (pages_in_upl - uio_last) * PAGE_SIZE, UPL_ABORT_FREE_ON_EMPTY); + } + /* - * compute size to transfer this round, if uio->uio_resid is + * compute size to transfer this round, if io_req_size is * still non-zero after this attempt, we'll loop around and * set up for another I/O. */ @@ -2964,26 +3423,32 @@ cluster_read_x(vnode_t vp, struct uio *uio, off_t filesize, int flags) if (val_size > max_size) val_size = max_size; - if (val_size > uio_resid(uio)) - // LP64todo - fix this - val_size = uio_resid(uio); + if (val_size > io_req_size) + val_size = io_req_size; - if (last_ioread_offset == 0) + if ((uio->uio_offset + val_size) > last_ioread_offset) last_ioread_offset = uio->uio_offset + val_size; if ((size_of_prefetch = (last_request_offset - last_ioread_offset)) && prefetch_enabled) { - /* - * if there's still I/O left to do for this request, and... - * we're not in hard throttle mode, then issue a - * pre-fetch I/O... the I/O latency will overlap - * with the copying of the data - */ - size_of_prefetch = cluster_rd_prefetch(vp, last_ioread_offset, size_of_prefetch, filesize); - last_ioread_offset += (off_t)(size_of_prefetch * PAGE_SIZE); + if ((last_ioread_offset - (uio->uio_offset + val_size)) <= upl_size) { + /* + * if there's still I/O left to do for this request, and... + * we're not in hard throttle mode, and... + * we're close to using up the previous prefetch, then issue a + * new pre-fetch I/O... the I/O latency will overlap + * with the copying of the data + */ + if (size_of_prefetch > max_rd_size) + size_of_prefetch = max_rd_size; + + size_of_prefetch = cluster_read_prefetch(vp, last_ioread_offset, size_of_prefetch, filesize, callback, callback_arg, bflag); + + last_ioread_offset += (off_t)(size_of_prefetch * PAGE_SIZE); - if (last_ioread_offset > last_request_offset) - last_ioread_offset = last_request_offset; + if (last_ioread_offset > last_request_offset) + last_ioread_offset = last_request_offset; + } } else if ((uio->uio_offset + val_size) == last_request_offset) { /* @@ -2993,7 +3458,7 @@ cluster_read_x(vnode_t vp, struct uio *uio, off_t filesize, int flags) * explicitly disabled it */ if (rd_ahead_enabled) - cluster_rd_ahead(vp, &extent, filesize, rap); + cluster_read_ahead(vp, &extent, filesize, rap, callback, callback_arg, bflag); if (rap != NULL) { if (extent.e_addr < rap->cl_lastr) @@ -3004,43 +3469,50 @@ cluster_read_x(vnode_t vp, struct uio *uio, off_t filesize, int flags) lck_mtx_lock(cl_mtxp); while (iostate.io_issued != iostate.io_completed) { + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 95)) | DBG_FUNC_START, + iostate.io_issued, iostate.io_completed, 0, 0, 0); + iostate.io_wanted = 1; - msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_read_x", 0); + msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_read_copy", NULL); + + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 95)) | DBG_FUNC_END, + iostate.io_issued, iostate.io_completed, 0, 0, 0); } lck_mtx_unlock(cl_mtxp); if (iostate.io_error) error = iostate.io_error; - else - retval = cluster_copy_upl_data(uio, upl, start_offset, val_size); + else { + u_int32_t io_requested; + + io_requested = val_size; + + retval = cluster_copy_upl_data(uio, upl, start_offset, (int *)&io_requested); + + io_req_size -= (val_size - io_requested); + } } 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 + * or abort them if the I/O failed or we're not supposed to + * keep them in the cache */ 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); + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 35)) | DBG_FUNC_START, (int)upl, start_pg * PAGE_SIZE, io_size, error, 0); if (error || (flags & IO_NOCACHE)) ubc_upl_abort_range(upl, start_pg * PAGE_SIZE, io_size, - UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY); + 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); + 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); + 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 @@ -3049,91 +3521,57 @@ cluster_read_x(vnode_t vp, struct uio *uio, off_t filesize, int flags) 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) && (flags & IO_NOCACHE)) - 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) && (flags & IO_NOCACHE)) - 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); - } + /* + * handle any valid pages at the beginning of + * the upl... release these appropriately + */ + cluster_read_upl_release(upl, 0, start_pg, flags); + + /* + * handle any valid pages immediately after the + * pages we issued I/O for... ... release these appropriately + */ + cluster_read_upl_release(upl, last_pg, uio_last, flags); - KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 35)) | DBG_FUNC_END, - (int)upl, -1, -1, 0, 0); + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 35)) | DBG_FUNC_END, (int)upl, -1, -1, 0, 0); } } if (retval == 0) retval = error; - if ( uio_resid(uio) ) { + if (io_req_size) { if (cluster_hard_throttle_on(vp)) { rd_ahead_enabled = 0; prefetch_enabled = 0; max_rd_size = HARD_THROTTLE_MAXSIZE; } else { - if (rap != NULL) - rd_ahead_enabled = 1; - prefetch_enabled = 1; + if (max_rd_size == HARD_THROTTLE_MAXSIZE) { + /* + * coming out of throttled state + */ + if (rap != NULL) + rd_ahead_enabled = 1; + prefetch_enabled = 1; - max_rd_size = MAX_UPL_TRANSFER * PAGE_SIZE; + max_rd_size = max_prefetch; + last_ioread_offset = 0; + } } } } if (rap != NULL) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 32)) | DBG_FUNC_END, - (int)uio->uio_offset, uio_resid(uio), rap->cl_lastr, retval, 0); + (int)uio->uio_offset, io_req_size, rap->cl_lastr, retval, 0); lck_mtx_unlock(&rap->cl_lockr); } else { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 32)) | DBG_FUNC_END, - (int)uio->uio_offset, uio_resid(uio), 0, retval, 0); + (int)uio->uio_offset, io_req_size, 0, retval, 0); } return (retval); @@ -3141,107 +3579,205 @@ cluster_read_x(vnode_t vp, struct uio *uio, off_t filesize, int flags) static int -cluster_nocopy_read(vnode_t vp, struct uio *uio, off_t filesize) +cluster_read_direct(vnode_t vp, struct uio *uio, off_t filesize, int *read_type, u_int32_t *read_length, + int flags, int (*callback)(buf_t, void *), void *callback_arg) { upl_t upl; upl_page_info_t *pl; + off_t max_io_size; vm_offset_t upl_offset; - off_t max_io_size; - int io_size; - int upl_size; - int upl_needed_size; - int pages_in_pl; + vm_size_t upl_size; + vm_size_t upl_needed_size; + unsigned int pages_in_pl; int upl_flags; + int bflag; kern_return_t kret; - int i; + unsigned int i; int force_data_sync; int retval = 0; int no_zero_fill = 0; int abort_flag = 0; + int io_flag = 0; + int misaligned = 0; struct clios iostate; - u_int max_rd_size = MAX_UPL_TRANSFER * PAGE_SIZE; - u_int max_rd_ahead = MAX_UPL_TRANSFER * PAGE_SIZE * 2; + user_addr_t iov_base; + u_int32_t io_req_size; + u_int32_t offset_in_file; + u_int32_t offset_in_iovbase; + u_int32_t io_size; + u_int32_t io_min; + u_int32_t xsize; + u_int32_t devblocksize; + u_int32_t mem_alignment_mask; + u_int32_t max_upl_size; + u_int32_t max_rd_size; + u_int32_t max_rd_ahead; + + + max_upl_size = cluster_max_io_size(vp->v_mount, CL_READ); + max_rd_size = max_upl_size; + max_rd_ahead = max_rd_size * 2; - KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 70)) | DBG_FUNC_START, - (int)uio->uio_offset, uio_resid(uio), (int)filesize, 0, 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 - */ + if (flags & IO_PASSIVE) + bflag = CL_PASSIVE; + else + bflag = 0; + + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 70)) | DBG_FUNC_START, + (int)uio->uio_offset, (int)filesize, *read_type, *read_length, 0); iostate.io_completed = 0; iostate.io_issued = 0; iostate.io_error = 0; iostate.io_wanted = 0; - while (uio_resid(uio) && uio->uio_offset < filesize && retval == 0) { - user_addr_t iov_base; + devblocksize = (u_int32_t)vp->v_mount->mnt_devblocksize; + mem_alignment_mask = (u_int32_t)vp->v_mount->mnt_alignmentmask; + + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 70)) | DBG_FUNC_NONE, + (int)devblocksize, (int)mem_alignment_mask, 0, 0, 0); + + if (devblocksize == 1) { + /* + * the AFP client advertises a devblocksize of 1 + * however, its BLOCKMAP routine maps to physical + * blocks that are PAGE_SIZE in size... + * therefore we can't ask for I/Os that aren't page aligned + * or aren't multiples of PAGE_SIZE in size + * by setting devblocksize to PAGE_SIZE, we re-instate + * the old behavior we had before the mem_alignment_mask + * changes went in... + */ + devblocksize = PAGE_SIZE; + } +next_dread: + io_req_size = *read_length; + iov_base = uio_curriovbase(uio); + + max_io_size = filesize - uio->uio_offset; + + if ((off_t)io_req_size > max_io_size) + io_req_size = max_io_size; + + offset_in_file = (u_int32_t)uio->uio_offset & (devblocksize - 1); + offset_in_iovbase = (u_int32_t)iov_base & mem_alignment_mask; + + if (offset_in_file || offset_in_iovbase) { + /* + * one of the 2 important offsets is misaligned + * so fire an I/O through the cache for this entire vector + */ + misaligned = 1; + } + if (iov_base & (devblocksize - 1)) { + /* + * the offset in memory must be on a device block boundary + * so that we can guarantee that we can generate an + * I/O that ends on a page boundary in cluster_io + */ + misaligned = 1; + } + /* + * When we get to this point, we know... + * -- the offset into the file is on a devblocksize boundary + */ + + while (io_req_size && retval == 0) { + u_int32_t io_start; if (cluster_hard_throttle_on(vp)) { max_rd_size = HARD_THROTTLE_MAXSIZE; max_rd_ahead = HARD_THROTTLE_MAXSIZE - 1; } else { - max_rd_size = MAX_UPL_TRANSFER * PAGE_SIZE; - max_rd_ahead = MAX_UPL_TRANSFER * PAGE_SIZE * 8; + max_rd_size = max_upl_size; + max_rd_ahead = max_rd_size * 2; } - max_io_size = filesize - uio->uio_offset; - - // LP64todo - fix this - if (max_io_size < (off_t)((unsigned int)uio_resid(uio))) - io_size = max_io_size; - else - io_size = uio_resid(uio); + io_start = io_size = io_req_size; /* * First look for pages already in the cache * and move them to user space. + * + * cluster_copy_ubc_data returns the resid + * in io_size */ - retval = cluster_copy_ubc_data(vp, uio, &io_size, 0); + retval = cluster_copy_ubc_data_internal(vp, uio, (int *)&io_size, 0, 0); - 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 + /* + * calculate the number of bytes actually copied + * starting size - residual + */ + xsize = io_start - io_size; + + io_req_size -= xsize; + + /* + * check to see if we are finished with this request... + */ + if (io_req_size == 0 || misaligned) { + /* + * see if there's another uio vector to + * process that's of type IO_DIRECT + * + * break out of while loop to get there */ - goto wait_for_reads; + break; } /* - * If we are already finished with this read, then return + * assume the request ends on a device block boundary */ - if (io_size == 0) { - /* + io_min = devblocksize; + + /* + * we can handle I/O's in multiples of the device block size + * however, if io_size isn't a multiple of devblocksize we + * want to clip it back to the nearest page boundary since + * we are going to have to go through cluster_read_copy to + * deal with the 'overhang'... by clipping it to a PAGE_SIZE + * multiple, we avoid asking the drive for the same physical + * blocks twice.. once for the partial page at the end of the + * request and a 2nd time for the page we read into the cache + * (which overlaps the end of the direct read) in order to + * get at the overhang bytes + */ + if (io_size & (devblocksize - 1)) { + /* + * request does NOT end on a device block boundary + * so clip it back to a PAGE_SIZE boundary + */ + io_size &= ~PAGE_MASK; + io_min = PAGE_SIZE; + } + if (retval || io_size < io_min) { + /* + * either an error or we only have the tail left to + * complete via the copy path... * 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; + goto wait_for_dreads; } - max_io_size = io_size; - - if (max_io_size > max_rd_size) - max_io_size = max_rd_size; + if ((xsize = io_size) > max_rd_size) + xsize = max_rd_size; io_size = 0; - ubc_range_op(vp, uio->uio_offset, uio->uio_offset + max_io_size, UPL_ROP_ABSENT, &io_size); + ubc_range_op(vp, uio->uio_offset, uio->uio_offset + xsize, UPL_ROP_ABSENT, (int *)&io_size); - if (io_size == 0) + 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 + * a page must have just come into the cache + * since the first page in this range is no + * longer absent, go back and re-evaluate */ - goto wait_for_reads; - + continue; + } iov_base = uio_curriovbase(uio); - // LP64todo - fix this! - upl_offset = CAST_DOWN(vm_offset_t, iov_base) & PAGE_MASK; + upl_offset = (vm_offset_t)((u_int32_t)iov_base & PAGE_MASK); upl_needed_size = (upl_offset + io_size + (PAGE_SIZE -1)) & ~PAGE_MASK; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 72)) | DBG_FUNC_START, @@ -3264,7 +3800,6 @@ cluster_nocopy_read(vnode_t vp, struct uio *uio, off_t filesize) if (force_data_sync) upl_flags |= UPL_FORCE_DATA_SYNC; - // LP64todo - fix this! kret = vm_map_create_upl(current_map(), (vm_map_offset_t)(iov_base & ~((user_addr_t)PAGE_MASK)), &upl_size, &upl, NULL, &pages_in_pl, &upl_flags); @@ -3273,13 +3808,13 @@ cluster_nocopy_read(vnode_t vp, struct uio *uio, off_t filesize) 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 + * 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; + goto wait_for_dreads; } pages_in_pl = upl_size / PAGE_SIZE; pl = UPL_GET_INTERNAL_PAGE_LIST(upl); @@ -3291,23 +3826,26 @@ cluster_nocopy_read(vnode_t vp, struct uio *uio, off_t filesize) if (i == pages_in_pl) break; - ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size, abort_flag); + ubc_upl_abort(upl, abort_flag); } 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; + goto wait_for_dreads; } /* * 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 (upl_size < upl_needed_size) { + if (upl_size && upl_offset == 0) + io_size = upl_size; + else + io_size = 0; + } if (io_size == 0) { - ubc_upl_abort_range(upl, (upl_offset & ~PAGE_MASK), upl_size, abort_flag); - goto wait_for_reads; + ubc_upl_abort(upl, abort_flag); + goto wait_for_dreads; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 72)) | DBG_FUNC_END, (int)upl_offset, upl_size, io_size, kret, 0); @@ -3321,8 +3859,14 @@ cluster_nocopy_read(vnode_t vp, struct uio *uio, off_t filesize) lck_mtx_lock(cl_mtxp); while ((iostate.io_issued - iostate.io_completed) > max_rd_ahead) { + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 95)) | DBG_FUNC_START, + iostate.io_issued, iostate.io_completed, max_rd_ahead, 0, 0); + iostate.io_wanted = 1; - msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_nocopy_read", 0); + msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_read_direct", NULL); + + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 95)) | DBG_FUNC_END, + iostate.io_issued, iostate.io_completed, max_rd_ahead, 0, 0); } lck_mtx_unlock(cl_mtxp); @@ -3334,158 +3878,219 @@ cluster_nocopy_read(vnode_t vp, struct uio *uio, off_t filesize) * 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, abort_flag); + ubc_upl_abort(upl, abort_flag); - goto wait_for_reads; + goto wait_for_dreads; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 73)) | DBG_FUNC_START, (int)upl, (int)upl_offset, (int)uio->uio_offset, io_size, 0); - retval = cluster_io(vp, upl, upl_offset, uio->uio_offset, io_size, - CL_PRESERVE | CL_COMMIT | CL_READ | CL_ASYNC | CL_NOZERO, - (buf_t)NULL, &iostate); + if (no_zero_fill) + io_flag = CL_COMMIT | CL_READ | CL_ASYNC | CL_NOZERO | CL_DIRECT_IO | bflag; + else + io_flag = CL_COMMIT | CL_READ | CL_ASYNC | CL_NOZERO | CL_DIRECT_IO | CL_PRESERVE | bflag; + + retval = cluster_io(vp, upl, upl_offset, uio->uio_offset, io_size, io_flag, (buf_t)NULL, &iostate, callback, callback_arg); /* * update the uio structure */ uio_update(uio, (user_size_t)io_size); + io_req_size -= io_size; + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 73)) | DBG_FUNC_END, - (int)upl, (int)uio->uio_offset, (int)uio_resid(uio), retval, 0); + (int)upl, (int)uio->uio_offset, io_req_size, retval, 0); } /* end while */ -wait_for_reads: - /* - * make sure all async reads that are part of this stream - * have completed before we return - */ - lck_mtx_lock(cl_mtxp); + if (retval == 0 && iostate.io_error == 0 && io_req_size == 0 && uio->uio_offset < filesize) { - while (iostate.io_issued != iostate.io_completed) { - iostate.io_wanted = 1; - msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_nocopy_read", 0); - } - lck_mtx_unlock(cl_mtxp); + retval = cluster_io_type(uio, read_type, read_length, 0); + + if (retval == 0 && *read_type == IO_DIRECT) { + + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 70)) | DBG_FUNC_NONE, + (int)uio->uio_offset, (int)filesize, *read_type, *read_length, 0); + + goto next_dread; + } + } + +wait_for_dreads: + if (iostate.io_issued) { + /* + * make sure all async reads that are part of this stream + * have completed before we return + */ + lck_mtx_lock(cl_mtxp); + + while (iostate.io_issued != iostate.io_completed) { + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 95)) | DBG_FUNC_START, + iostate.io_issued, iostate.io_completed, 0, 0, 0); + + iostate.io_wanted = 1; + msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_read_direct", NULL); + + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 95)) | DBG_FUNC_END, + iostate.io_issued, iostate.io_completed, 0, 0, 0); + } + lck_mtx_unlock(cl_mtxp); + } if (iostate.io_error) - retval = iostate.io_error; + retval = iostate.io_error; + + if (io_req_size && retval == 0) { + /* + * we couldn't handle the tail of this request in DIRECT mode + * so fire it through the copy path + */ + retval = cluster_read_copy(vp, uio, io_req_size, filesize, flags, callback, callback_arg); + *read_type = IO_UNKNOWN; + } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 70)) | DBG_FUNC_END, - (int)uio->uio_offset, (int)uio_resid(uio), 6, retval, 0); + (int)uio->uio_offset, (int)uio_resid(uio), io_req_size, retval, 0); return (retval); } static int -cluster_phys_read(vnode_t vp, struct uio *uio, off_t filesize) +cluster_read_contig(vnode_t vp, struct uio *uio, off_t filesize, int *read_type, u_int32_t *read_length, + int (*callback)(buf_t, void *), void *callback_arg, int flags) { upl_page_info_t *pl; - upl_t upl; + upl_t upl[MAX_VECTS]; vm_offset_t upl_offset; - addr64_t dst_paddr; - off_t max_size; - int io_size; - user_size_t iov_len; + addr64_t dst_paddr = 0; user_addr_t iov_base; - int tail_size; - int upl_size; - int upl_needed_size; - int pages_in_pl; + off_t max_size; + vm_size_t upl_size; + vm_size_t upl_needed_size; + mach_msg_type_number_t pages_in_pl; int upl_flags; kern_return_t kret; struct clios iostate; - int error; - int devblocksize; + int error= 0; + int cur_upl = 0; + int num_upl = 0; + int n; + u_int32_t xsize; + u_int32_t io_size; + u_int32_t devblocksize; + u_int32_t mem_alignment_mask; + u_int32_t tail_size = 0; + int bflag; + + if (flags & IO_PASSIVE) + bflag = CL_PASSIVE; + else + bflag = 0; - devblocksize = vp->v_mount->mnt_devblocksize; /* * When we enter this routine, we know - * -- the resid will not exceed iov_len - * -- the target address is physically contiguous + * -- the read_length will not exceed the current iov_len + * -- the target address is physically contiguous for read_length */ + cluster_syncup(vp, filesize, callback, callback_arg); -#if LP64_DEBUG - if (IS_VALID_UIO_SEGFLG(uio->uio_segflg) == 0) { - panic("%s :%d - invalid uio_segflg\n", __FILE__, __LINE__); - } -#endif /* LP64_DEBUG */ + devblocksize = (u_int32_t)vp->v_mount->mnt_devblocksize; + mem_alignment_mask = (u_int32_t)vp->v_mount->mnt_alignmentmask; - iov_len = uio_curriovlen(uio); - iov_base = uio_curriovbase(uio); + iostate.io_completed = 0; + iostate.io_issued = 0; + iostate.io_error = 0; + iostate.io_wanted = 0; + +next_cread: + io_size = *read_length; max_size = filesize - uio->uio_offset; - // LP64todo - fix this! - if (max_size < 0 || (u_int64_t)max_size > iov_len) - io_size = iov_len; - else + if (io_size > max_size) io_size = max_size; - // LP64todo - fix this! - upl_offset = CAST_DOWN(vm_offset_t, iov_base) & PAGE_MASK; + iov_base = uio_curriovbase(uio); + + upl_offset = (vm_offset_t)((u_int32_t)iov_base & PAGE_MASK); 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 | UPL_SET_LITE | UPL_SET_IO_WIRE; + + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 92)) | DBG_FUNC_START, + (int)upl_offset, (int)upl_size, (int)iov_base, io_size, 0); + kret = vm_map_get_upl(current_map(), (vm_map_offset_t)(iov_base & ~((user_addr_t)PAGE_MASK)), - &upl_size, &upl, NULL, &pages_in_pl, &upl_flags, 0); + &upl_size, &upl[cur_upl], NULL, &pages_in_pl, &upl_flags, 0); + + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 92)) | DBG_FUNC_END, + (int)upl_offset, upl_size, io_size, kret, 0); if (kret != KERN_SUCCESS) { /* - * cluster_phys_read: failed to get pagelist + * failed to get pagelist */ - return(EINVAL); + error = EINVAL; + goto wait_for_creads; } + num_upl++; + 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); + error = EINVAL; + goto wait_for_creads; } - pl = ubc_upl_pageinfo(upl); + pl = ubc_upl_pageinfo(upl[cur_upl]); dst_paddr = ((addr64_t)upl_phys_page(pl, 0) << 12) + (addr64_t)upl_offset; while (((uio->uio_offset & (devblocksize - 1)) || io_size < devblocksize) && io_size) { - int head_size; + u_int32_t head_size; - head_size = devblocksize - (int)(uio->uio_offset & (devblocksize - 1)); + head_size = devblocksize - (u_int32_t)(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, CL_READ); + error = cluster_align_phys_io(vp, uio, dst_paddr, head_size, CL_READ, callback, callback_arg); - if (error) { - ubc_upl_abort_range(upl, 0, upl_size, UPL_ABORT_FREE_ON_EMPTY); + if (error) + goto wait_for_creads; - return(EINVAL); - } upl_offset += head_size; dst_paddr += head_size; io_size -= head_size; + + iov_base += head_size; } + if ((u_int32_t)iov_base & mem_alignment_mask) { + /* + * request doesn't set up on a memory boundary + * the underlying DMA engine can handle... + * return an error instead of going through + * the slow copy path since the intent of this + * path is direct I/O to device memory + */ + error = EINVAL; + goto wait_for_creads; + } + 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; + io_size -= tail_size; while (io_size && error == 0) { - int xsize; - if (io_size > (MAX_UPL_TRANSFER * PAGE_SIZE)) - xsize = MAX_UPL_TRANSFER * PAGE_SIZE; + if (io_size > MAX_IO_CONTIG_SIZE) + xsize = MAX_IO_CONTIG_SIZE; else xsize = io_size; /* @@ -3496,17 +4101,33 @@ cluster_phys_read(vnode_t vp, struct uio *uio, off_t filesize) * if there are already too many outstanding reads * wait until some have completed before issuing the next */ - lck_mtx_lock(cl_mtxp); + if (iostate.io_issued) { + lck_mtx_lock(cl_mtxp); - while ((iostate.io_issued - iostate.io_completed) > (8 * MAX_UPL_TRANSFER * PAGE_SIZE)) { - iostate.io_wanted = 1; - msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_phys_read", 0); - } - lck_mtx_unlock(cl_mtxp); + while ((iostate.io_issued - iostate.io_completed) > (2 * MAX_IO_CONTIG_SIZE)) { + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 95)) | DBG_FUNC_START, + iostate.io_issued, iostate.io_completed, 2 * MAX_IO_CONTIG_SIZE, 0, 0); + + iostate.io_wanted = 1; + msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_read_contig", NULL); - error = cluster_io(vp, upl, upl_offset, uio->uio_offset, xsize, - CL_READ | CL_NOZERO | CL_DEV_MEMORY | CL_ASYNC, - (buf_t)NULL, &iostate); + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 95)) | DBG_FUNC_END, + iostate.io_issued, iostate.io_completed, 2 * MAX_IO_CONTIG_SIZE, 0, 0); + } + lck_mtx_unlock(cl_mtxp); + } + if (iostate.io_error) { + /* + * one of the earlier reads we issued ran into a hard error + * don't issue any more reads... + * go wait for any other reads to complete before + * returning the error to the caller + */ + goto wait_for_creads; + } + error = cluster_io(vp, upl[cur_upl], upl_offset, uio->uio_offset, xsize, + CL_READ | CL_NOZERO | CL_DEV_MEMORY | CL_ASYNC | bflag, + (buf_t)NULL, &iostate, callback, callback_arg); /* * The cluster_io read was issued successfully, * update the uio structure @@ -3519,6 +4140,18 @@ cluster_phys_read(vnode_t vp, struct uio *uio, off_t filesize) io_size -= xsize; } } + if (error == 0 && iostate.io_error == 0 && tail_size == 0 && num_upl < MAX_VECTS && uio->uio_offset < filesize) { + + error = cluster_io_type(uio, read_type, read_length, 0); + + if (error == 0 && *read_type == IO_CONTIG) { + cur_upl++; + goto next_cread; + } + } else + *read_type = IO_UNKNOWN; + +wait_for_creads: /* * make sure all async reads that are part of this stream * have completed before we proceed @@ -3526,8 +4159,14 @@ cluster_phys_read(vnode_t vp, struct uio *uio, off_t filesize) lck_mtx_lock(cl_mtxp); while (iostate.io_issued != iostate.io_completed) { + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 95)) | DBG_FUNC_START, + iostate.io_issued, iostate.io_completed, 0, 0, 0); + iostate.io_wanted = 1; - msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_phys_read", 0); + msleep((caddr_t)&iostate.io_wanted, cl_mtxp, PRIBIO + 1, "cluster_read_contig", NULL); + + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 95)) | DBG_FUNC_END, + iostate.io_issued, iostate.io_completed, 0, 0, 0); } lck_mtx_unlock(cl_mtxp); @@ -3535,24 +4174,96 @@ cluster_phys_read(vnode_t vp, struct uio *uio, off_t filesize) error = iostate.io_error; if (error == 0 && tail_size) - error = cluster_align_phys_io(vp, uio, dst_paddr, tail_size, CL_READ); + error = cluster_align_phys_io(vp, uio, dst_paddr, tail_size, CL_READ, callback, callback_arg); - /* - * 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); + for (n = 0; n < num_upl; n++) + /* + * just release our hold on each physically contiguous + * region without changing any state + */ + ubc_upl_abort(upl[n], 0); return (error); } +static int +cluster_io_type(struct uio *uio, int *io_type, u_int32_t *io_length, u_int32_t min_length) +{ + user_size_t iov_len; + user_addr_t iov_base = 0; + upl_t upl; + vm_size_t upl_size; + int upl_flags; + int retval = 0; + + /* + * skip over any emtpy vectors + */ + uio_update(uio, (user_size_t)0); + + iov_len = uio_curriovlen(uio); + + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 94)) | DBG_FUNC_START, (int)uio, (int)iov_len, 0, 0, 0); + + if (iov_len) { + iov_base = uio_curriovbase(uio); + /* + * make sure the size of the vector isn't too big... + * internally, we want to handle all of the I/O in + * chunk sizes that fit in a 32 bit int + */ + if (iov_len > (user_size_t)MAX_IO_REQUEST_SIZE) + upl_size = MAX_IO_REQUEST_SIZE; + else + upl_size = (u_int32_t)iov_len; + + upl_flags = UPL_QUERY_OBJECT_TYPE; + + if ((vm_map_get_upl(current_map(), + (vm_map_offset_t)(iov_base & ~((user_addr_t)PAGE_MASK)), + &upl_size, &upl, NULL, NULL, &upl_flags, 0)) != KERN_SUCCESS) { + /* + * the user app must have passed in an invalid address + */ + retval = EFAULT; + } + if (upl_size == 0) + retval = EFAULT; + + *io_length = upl_size; + + if (upl_flags & UPL_PHYS_CONTIG) + *io_type = IO_CONTIG; + else if (iov_len >= min_length) + *io_type = IO_DIRECT; + else + *io_type = IO_COPY; + } else { + /* + * nothing left to do for this uio + */ + *io_length = 0; + *io_type = IO_UNKNOWN; + } + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 94)) | DBG_FUNC_END, (int)iov_base, *io_type, *io_length, retval, 0); + + return (retval); +} + + /* * generate advisory I/O's in the largest chunks possible * the completed pages will be released into the VM cache */ int advisory_read(vnode_t vp, off_t filesize, off_t f_offset, int resid) +{ + return advisory_read_ext(vp, filesize, f_offset, resid, NULL, NULL, CL_PASSIVE); +} + +int +advisory_read_ext(vnode_t vp, off_t filesize, off_t f_offset, int resid, int (*callback)(buf_t, void *), void *callback_arg, int bflag) { upl_page_info_t *pl; upl_t upl; @@ -3569,12 +4280,19 @@ advisory_read(vnode_t vp, off_t filesize, off_t f_offset, int resid) int retval = 0; int issued_io; int skip_range; - + uint32_t max_io_size; + + if ( !UBCINFOEXISTS(vp)) return(EINVAL); + if (resid < 0) + return(EINVAL); + + max_io_size = cluster_max_io_size(vp->v_mount, CL_READ); + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 60)) | DBG_FUNC_START, - (int)f_offset, resid, (int)filesize, 0, 0); + (int)f_offset, resid, (int)filesize, 0, 0); while (resid && f_offset < filesize && retval == 0) { /* @@ -3595,8 +4313,8 @@ advisory_read(vnode_t vp, off_t filesize, off_t f_offset, int resid) 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; + if ((uint32_t)upl_size > max_io_size) + upl_size = max_io_size; skip_range = 0; /* @@ -3696,7 +4414,7 @@ advisory_read(vnode_t vp, off_t filesize, off_t f_offset, int resid) * issue an asynchronous read to cluster_io */ retval = cluster_io(vp, upl, upl_offset, upl_f_offset + upl_offset, io_size, - CL_ASYNC | CL_READ | CL_COMMIT | CL_AGE, (buf_t)NULL, (struct clios *)NULL); + CL_ASYNC | CL_READ | CL_COMMIT | CL_AGE | bflag, (buf_t)NULL, (struct clios *)NULL, callback, callback_arg); issued_io = 1; } @@ -3721,6 +4439,13 @@ advisory_read(vnode_t vp, off_t filesize, off_t f_offset, int resid) int cluster_push(vnode_t vp, int flags) +{ + return cluster_push_ext(vp, flags, NULL, NULL); +} + + +int +cluster_push_ext(vnode_t vp, int flags, int (*callback)(buf_t, void *), void *callback_arg) { int retval; struct cl_writebehind *wbp; @@ -3747,16 +4472,16 @@ cluster_push(vnode_t vp, int flags) (int)wbp->cl_scmap, wbp->cl_number, flags, 0, 0); if (wbp->cl_scmap) { - sparse_cluster_push(wbp, vp, ubc_getsize(vp), 1); + sparse_cluster_push(wbp, vp, ubc_getsize(vp), PUSH_ALL | IO_PASSIVE, callback, callback_arg); retval = 1; } else - retval = cluster_try_push(wbp, vp, ubc_getsize(vp), 0, 1); + retval = cluster_try_push(wbp, vp, ubc_getsize(vp), PUSH_ALL | IO_PASSIVE, callback, callback_arg); lck_mtx_unlock(&wbp->cl_lockw); if (flags & IO_SYNC) - (void)vnode_waitforwrites(vp, 0, 0, 0, (char *)"cluster_push"); + (void)vnode_waitforwrites(vp, 0, 0, 0, "cluster_push"); KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 53)) | DBG_FUNC_END, (int)wbp->cl_scmap, wbp->cl_number, retval, 0, 0); @@ -3798,30 +4523,8 @@ cluster_release(struct ubc_info *ubc) } -static void -cluster_push_EOF(vnode_t vp, off_t EOF) -{ - struct cl_writebehind *wbp; - - wbp = cluster_get_wbp(vp, CLW_ALLOCATE | CLW_RETURNLOCKED); - - KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 53)) | DBG_FUNC_START, - (int)wbp->cl_scmap, wbp->cl_number, (int)EOF, 0, 0); - - if (wbp->cl_scmap) - sparse_cluster_push(wbp, vp, EOF, 1); - else - cluster_try_push(wbp, vp, EOF, 0, 1); - - KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 53)) | DBG_FUNC_END, - (int)wbp->cl_scmap, wbp->cl_number, 0, 0, 0); - - lck_mtx_unlock(&wbp->cl_lockw); -} - - static int -cluster_try_push(struct cl_writebehind *wbp, vnode_t vp, off_t EOF, int can_delay, int push_all) +cluster_try_push(struct cl_writebehind *wbp, vnode_t vp, off_t EOF, int push_flag, int (*callback)(buf_t, void *), void *callback_arg) { int cl_index; int cl_index1; @@ -3829,11 +4532,22 @@ cluster_try_push(struct cl_writebehind *wbp, vnode_t vp, off_t EOF, int can_dela int cl_len; int cl_pushed = 0; struct cl_wextent l_clusters[MAX_CLUSTERS]; - + u_int max_cluster_pgcount; + + + max_cluster_pgcount = MAX_CLUSTER_SIZE(vp) / PAGE_SIZE; /* * the write behind context exists and has * already been locked... - * + */ + if (wbp->cl_number == 0) + /* + * no clusters to push + * return number of empty slots + */ + return (MAX_CLUSTERS); + + /* * make a local 'sorted' copy of the clusters * and clear wbp->cl_number so that new clusters can * be developed @@ -3851,7 +4565,7 @@ cluster_try_push(struct cl_writebehind *wbp, vnode_t vp, off_t EOF, int can_dela break; l_clusters[cl_index].b_addr = wbp->cl_clusters[min_index].b_addr; l_clusters[cl_index].e_addr = wbp->cl_clusters[min_index].e_addr; - l_clusters[cl_index].io_nocache = wbp->cl_clusters[min_index].io_nocache; + l_clusters[cl_index].io_flags = wbp->cl_clusters[min_index].io_flags; wbp->cl_clusters[min_index].b_addr = wbp->cl_clusters[min_index].e_addr; } @@ -3859,7 +4573,7 @@ cluster_try_push(struct cl_writebehind *wbp, vnode_t vp, off_t EOF, int can_dela cl_len = cl_index; - if (can_delay && cl_len == MAX_CLUSTERS) { + if ( (push_flag & PUSH_DELAY) && cl_len == MAX_CLUSTERS ) { int i; /* @@ -3869,7 +4583,7 @@ cluster_try_push(struct cl_writebehind *wbp, vnode_t vp, off_t EOF, int can_dela * used for managing more random I/O patterns * * we know that we've got all clusters currently in use and the next write doesn't fit into one of them... - * that's why we're in try_push with can_delay true... + * that's why we're in try_push with PUSH_DELAY... * * check to make sure that all the clusters except the last one are 'full'... and that each cluster * is adjacent to the next (i.e. we're looking for sequential writes) they were sorted above @@ -3882,46 +4596,43 @@ cluster_try_push(struct cl_writebehind *wbp, vnode_t vp, off_t EOF, int can_dela * of order... if this occurs at the tail of the last cluster, we don't want to fall into the sparse cluster world... */ for (i = 0; i < MAX_CLUSTERS - 1; i++) { - if ((l_clusters[i].e_addr - l_clusters[i].b_addr) != MAX_UPL_TRANSFER) + if ((l_clusters[i].e_addr - l_clusters[i].b_addr) != max_cluster_pgcount) goto dont_try; if (l_clusters[i].e_addr != l_clusters[i+1].b_addr) goto dont_try; } } - /* - * drop the lock while we're firing off the I/Os... - * this is safe since I'm working off of a private sorted copy - * of the clusters, and I'm going to re-evaluate the public - * state after I retake the lock - */ - lck_mtx_unlock(&wbp->cl_lockw); - for (cl_index = 0; cl_index < cl_len; cl_index++) { - int flags; - struct cl_extent cl; + int flags; + struct cl_extent cl; /* * try to push each cluster in turn... */ - if (l_clusters[cl_index].io_nocache) + if (l_clusters[cl_index].io_flags & CLW_IONOCACHE) flags = IO_NOCACHE; else flags = 0; + + if ((l_clusters[cl_index].io_flags & CLW_IOPASSIVE) || (push_flag & IO_PASSIVE)) + flags |= IO_PASSIVE; + + if (push_flag & PUSH_SYNC) + flags |= IO_SYNC; + cl.b_addr = l_clusters[cl_index].b_addr; cl.e_addr = l_clusters[cl_index].e_addr; - cluster_push_x(vp, &cl, EOF, flags); + cluster_push_now(vp, &cl, EOF, flags, callback, callback_arg); l_clusters[cl_index].b_addr = 0; l_clusters[cl_index].e_addr = 0; cl_pushed++; - if (push_all == 0) + if ( !(push_flag & PUSH_ALL) ) break; } - lck_mtx_lock(&wbp->cl_lockw); - dont_try: if (cl_len > cl_pushed) { /* @@ -3938,14 +4649,14 @@ dont_try: * * collect the active public clusters... */ - sparse_cluster_switch(wbp, vp, EOF); + sparse_cluster_switch(wbp, vp, EOF, callback, callback_arg); for (cl_index = 0, cl_index1 = 0; cl_index < cl_len; cl_index++) { if (l_clusters[cl_index].b_addr == l_clusters[cl_index].e_addr) continue; wbp->cl_clusters[cl_index1].b_addr = l_clusters[cl_index].b_addr; wbp->cl_clusters[cl_index1].e_addr = l_clusters[cl_index].e_addr; - wbp->cl_clusters[cl_index1].io_nocache = l_clusters[cl_index].io_nocache; + wbp->cl_clusters[cl_index1].io_flags = l_clusters[cl_index].io_flags; cl_index1++; } @@ -3958,7 +4669,7 @@ dont_try: * and collect the original clusters that were moved into the * local storage for sorting purposes */ - sparse_cluster_switch(wbp, vp, EOF); + sparse_cluster_switch(wbp, vp, EOF, callback, callback_arg); } else { /* @@ -3972,7 +4683,7 @@ dont_try: wbp->cl_clusters[cl_index1].b_addr = l_clusters[cl_index].b_addr; wbp->cl_clusters[cl_index1].e_addr = l_clusters[cl_index].e_addr; - wbp->cl_clusters[cl_index1].io_nocache = l_clusters[cl_index].io_nocache; + wbp->cl_clusters[cl_index1].io_flags = l_clusters[cl_index].io_flags; cl_index1++; } @@ -3982,13 +4693,13 @@ dont_try: wbp->cl_number = cl_index1; } } - return(MAX_CLUSTERS - wbp->cl_number); + return (MAX_CLUSTERS - wbp->cl_number); } static int -cluster_push_x(vnode_t vp, struct cl_extent *cl, off_t EOF, int flags) +cluster_push_now(vnode_t vp, struct cl_extent *cl, off_t EOF, int flags, int (*callback)(buf_t, void *), void *callback_arg) { upl_page_info_t *pl; upl_t upl; @@ -4001,11 +4712,16 @@ cluster_push_x(vnode_t vp, struct cl_extent *cl, off_t EOF, int flags) int io_size; int io_flags; int upl_flags; + int bflag; int size; int error = 0; int retval; kern_return_t kret; + if (flags & IO_PASSIVE) + bflag = CL_PASSIVE; + else + bflag = 0; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 51)) | DBG_FUNC_START, (int)cl->b_addr, (int)cl->e_addr, (int)EOF, flags, 0); @@ -4127,13 +4843,13 @@ cluster_push_x(vnode_t vp, struct cl_extent *cl, off_t EOF, int flags) io_size = min(size, (last_pg - start_pg) * PAGE_SIZE); - io_flags = CL_THROTTLE | CL_COMMIT; + io_flags = CL_THROTTLE | CL_COMMIT | CL_AGE | bflag; if ( !(flags & IO_SYNC)) io_flags |= CL_ASYNC; retval = cluster_io(vp, upl, upl_offset, upl_f_offset + upl_offset, io_size, - io_flags, (buf_t)NULL, (struct clios *)NULL); + io_flags, (buf_t)NULL, (struct clios *)NULL, callback, callback_arg); if (error == 0 && retval) error = retval; @@ -4150,7 +4866,7 @@ cluster_push_x(vnode_t vp, struct cl_extent *cl, off_t EOF, int flags) * sparse_cluster_switch is called with the write behind lock held */ static void -sparse_cluster_switch(struct cl_writebehind *wbp, vnode_t vp, off_t EOF) +sparse_cluster_switch(struct cl_writebehind *wbp, vnode_t vp, off_t EOF, int (*callback)(buf_t, void *), void *callback_arg) { int cl_index; @@ -4165,11 +4881,11 @@ sparse_cluster_switch(struct cl_writebehind *wbp, vnode_t vp, off_t EOF) for (cl.b_addr = wbp->cl_clusters[cl_index].b_addr; cl.b_addr < wbp->cl_clusters[cl_index].e_addr; cl.b_addr++) { - if (ubc_page_op(vp, (off_t)(cl.b_addr * PAGE_SIZE_64), 0, 0, &flags) == KERN_SUCCESS) { + if (ubc_page_op(vp, (off_t)(cl.b_addr * PAGE_SIZE_64), 0, NULL, &flags) == KERN_SUCCESS) { if (flags & UPL_POP_DIRTY) { cl.e_addr = cl.b_addr + 1; - sparse_cluster_add(wbp, vp, &cl, EOF); + sparse_cluster_add(wbp, vp, &cl, EOF, callback, callback_arg); } } } @@ -4184,15 +4900,15 @@ sparse_cluster_switch(struct cl_writebehind *wbp, vnode_t vp, off_t EOF) * sparse_cluster_push is called with the write behind lock held */ static void -sparse_cluster_push(struct cl_writebehind *wbp, vnode_t vp, off_t EOF, int push_all) +sparse_cluster_push(struct cl_writebehind *wbp, vnode_t vp, off_t EOF, int push_flag, int (*callback)(buf_t, void *), void *callback_arg) { struct cl_extent cl; off_t offset; u_int length; - KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 79)) | DBG_FUNC_START, (int)vp, (int)wbp->cl_scmap, wbp->cl_scdirty, push_all, 0); + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 79)) | DBG_FUNC_START, (int)vp, (int)wbp->cl_scmap, wbp->cl_scdirty, push_flag, 0); - if (push_all) + if (push_flag & PUSH_ALL) vfs_drt_control(&(wbp->cl_scmap), 1); for (;;) { @@ -4204,9 +4920,9 @@ sparse_cluster_push(struct cl_writebehind *wbp, vnode_t vp, off_t EOF, int push_ wbp->cl_scdirty -= (int)(cl.e_addr - cl.b_addr); - cluster_push_x(vp, &cl, EOF, 0); + cluster_push_now(vp, &cl, EOF, push_flag & IO_PASSIVE, callback, callback_arg); - if (push_all == 0) + if ( !(push_flag & PUSH_ALL) ) break; } KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 79)) | DBG_FUNC_END, (int)vp, (int)wbp->cl_scmap, wbp->cl_scdirty, 0, 0); @@ -4217,7 +4933,7 @@ sparse_cluster_push(struct cl_writebehind *wbp, vnode_t vp, off_t EOF, int push_ * sparse_cluster_add is called with the write behind lock held */ static void -sparse_cluster_add(struct cl_writebehind *wbp, vnode_t vp, struct cl_extent *cl, off_t EOF) +sparse_cluster_add(struct cl_writebehind *wbp, vnode_t vp, struct cl_extent *cl, off_t EOF, int (*callback)(buf_t, void *), void *callback_arg) { u_int new_dirty; u_int length; @@ -4236,7 +4952,7 @@ sparse_cluster_add(struct cl_writebehind *wbp, vnode_t vp, struct cl_extent *cl, */ wbp->cl_scdirty += new_dirty; - sparse_cluster_push(wbp, vp, EOF, 0); + sparse_cluster_push(wbp, vp, EOF, 0, callback, callback_arg); offset += (new_dirty * PAGE_SIZE_64); length -= (new_dirty * PAGE_SIZE); @@ -4248,7 +4964,7 @@ sparse_cluster_add(struct cl_writebehind *wbp, vnode_t vp, struct cl_extent *cl, static int -cluster_align_phys_io(vnode_t vp, struct uio *uio, addr64_t usr_paddr, int xsize, int flags) +cluster_align_phys_io(vnode_t vp, struct uio *uio, addr64_t usr_paddr, u_int32_t xsize, int flags, int (*callback)(buf_t, void *), void *callback_arg) { upl_page_info_t *pl; upl_t upl; @@ -4258,17 +4974,30 @@ cluster_align_phys_io(vnode_t vp, struct uio *uio, addr64_t usr_paddr, int xsize int did_read = 0; int abort_flags; int upl_flags; + int bflag; + + if (flags & IO_PASSIVE) + bflag = CL_PASSIVE; + else + bflag = 0; upl_flags = UPL_SET_LITE; - if (! (flags & CL_READ)) { + + if ( !(flags & CL_READ) ) { /* * "write" operation: let the UPL subsystem know * that we intend to modify the buffer cache pages * we're gathering. */ upl_flags |= UPL_WILL_MODIFY; + } else { + /* + * indicate that there is no need to pull the + * mapping for this page... we're only going + * to read from it, not modify it. + */ + upl_flags |= UPL_FILE_IO; } - kret = ubc_create_upl(vp, uio->uio_offset & ~PAGE_MASK_64, PAGE_SIZE, @@ -4284,7 +5013,7 @@ cluster_align_phys_io(vnode_t vp, struct uio *uio, addr64_t usr_paddr, int xsize * issue a synchronous read to cluster_io */ error = cluster_io(vp, upl, 0, uio->uio_offset & ~PAGE_MASK_64, PAGE_SIZE, - CL_READ, (buf_t)NULL, (struct clios *)NULL); + CL_READ | bflag, (buf_t)NULL, (struct clios *)NULL, callback, callback_arg); if (error) { ubc_upl_abort_range(upl, 0, PAGE_SIZE, UPL_ABORT_DUMP_PAGES | UPL_ABORT_FREE_ON_EMPTY); @@ -4312,9 +5041,9 @@ cluster_align_phys_io(vnode_t vp, struct uio *uio, addr64_t usr_paddr, int xsize * issue a synchronous write to cluster_io */ error = cluster_io(vp, upl, 0, uio->uio_offset & ~PAGE_MASK_64, PAGE_SIZE, - 0, (buf_t)NULL, (struct clios *)NULL); + bflag, (buf_t)NULL, (struct clios *)NULL, callback, callback_arg); } - if (error == 0) + if (error == 0) uio_update(uio, (user_size_t)xsize); if (did_read) @@ -4330,17 +5059,20 @@ cluster_align_phys_io(vnode_t vp, struct uio *uio, addr64_t usr_paddr, int xsize int -cluster_copy_upl_data(struct uio *uio, upl_t upl, int upl_offset, int xsize) +cluster_copy_upl_data(struct uio *uio, upl_t upl, int upl_offset, int *io_resid) { int pg_offset; int pg_index; int csize; int segflg; int retval = 0; + int xsize; upl_page_info_t *pl; + xsize = *io_resid; + KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_START, - (int)uio->uio_offset, uio_resid(uio), upl_offset, xsize, 0); + (int)uio->uio_offset, upl_offset, xsize, 0, 0); segflg = uio->uio_segflg; @@ -4391,10 +5123,12 @@ cluster_copy_upl_data(struct uio *uio, upl_t upl, int upl_offset, int xsize) xsize -= csize; csize = min(PAGE_SIZE, xsize); } + *io_resid = xsize; + uio->uio_segflg = segflg; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_END, - (int)uio->uio_offset, uio_resid(uio), retval, segflg, 0); + (int)uio->uio_offset, xsize, retval, segflg, 0); return (retval); } @@ -4402,6 +5136,14 @@ cluster_copy_upl_data(struct uio *uio, upl_t upl, int upl_offset, int xsize) int cluster_copy_ubc_data(vnode_t vp, struct uio *uio, int *io_resid, int mark_dirty) +{ + + return (cluster_copy_ubc_data_internal(vp, uio, io_resid, mark_dirty, 1)); +} + + +static int +cluster_copy_ubc_data_internal(vnode_t vp, struct uio *uio, int *io_resid, int mark_dirty, int take_reference) { int segflg; int io_size; @@ -4410,14 +5152,16 @@ cluster_copy_ubc_data(vnode_t vp, struct uio *uio, int *io_resid, int mark_dirty int retval = 0; memory_object_control_t control; + io_size = *io_resid; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_START, - (int)uio->uio_offset, uio_resid(uio), 0, *io_resid, 0); + (int)uio->uio_offset, 0, io_size, 0, 0); control = ubc_getobject(vp, UBC_FLAGS_NONE); + if (control == MEMORY_OBJECT_CONTROL_NULL) { KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_END, - (int)uio->uio_offset, uio_resid(uio), retval, 3, 0); + (int)uio->uio_offset, io_size, retval, 3, 0); return(0); } @@ -4457,8 +5201,8 @@ cluster_copy_ubc_data(vnode_t vp, struct uio *uio, int *io_resid, int mark_dirty start_offset = (int)(uio->uio_offset & PAGE_MASK_64); xsize = uio_resid(uio); - retval = memory_object_control_uiomove(control, uio->uio_offset - start_offset, - uio, start_offset, io_size, mark_dirty); + retval = memory_object_control_uiomove(control, uio->uio_offset - start_offset, uio, + start_offset, io_size, mark_dirty, take_reference); xsize -= uio_resid(uio); io_size -= xsize; } @@ -4466,7 +5210,7 @@ cluster_copy_ubc_data(vnode_t vp, struct uio *uio, int *io_resid, int mark_dirty *io_resid = io_size; KERNEL_DEBUG((FSDBG_CODE(DBG_FSRW, 34)) | DBG_FUNC_END, - (int)uio->uio_offset, uio_resid(uio), retval, 0x80000000 | segflg, 0); + (int)uio->uio_offset, io_size, retval, 0x80000000 | segflg, 0); return(retval); } @@ -4480,7 +5224,7 @@ is_file_clean(vnode_t vp, off_t filesize) int total_dirty = 0; for (f_offset = 0; f_offset < filesize; f_offset += PAGE_SIZE_64) { - if (ubc_page_op(vp, f_offset, 0, 0, &flags) == KERN_SUCCESS) { + if (ubc_page_op(vp, f_offset, 0, NULL, &flags) == KERN_SUCCESS) { if (flags & UPL_POP_DIRTY) { total_dirty++; } @@ -4667,7 +5411,7 @@ static kern_return_t vfs_drt_do_mark_pages( void **cmapp, u_int64_t offset, u_int length, - int *setcountp, + u_int *setcountp, int dirty); static void vfs_drt_trace( struct vfs_drt_clustermap *cmap, @@ -4692,7 +5436,8 @@ vfs_drt_alloc_map(struct vfs_drt_clustermap **cmapp) struct vfs_drt_clustermap *cmap, *ocmap; kern_return_t kret; u_int64_t offset; - int nsize, i, active_buckets, index, copycount; + u_int32_t i; + int nsize, active_buckets, index, copycount; ocmap = NULL; if (cmapp != NULL) @@ -4771,6 +5516,7 @@ vfs_drt_alloc_map(struct vfs_drt_clustermap **cmapp) if (kret != KERN_SUCCESS) { /* XXX need to bail out gracefully here */ panic("vfs_drt: new cluster map mysteriously too small"); + index = 0; } /* copy */ DRT_HASH_COPY(ocmap, i, cmap, index); @@ -4819,7 +5565,8 @@ vfs_drt_free_map(struct vfs_drt_clustermap *cmap) static kern_return_t vfs_drt_search_index(struct vfs_drt_clustermap *cmap, u_int64_t offset, int *indexp) { - int index, i; + int index; + u_int32_t i; offset = DRT_ALIGN_ADDRESS(offset); index = DRT_HASH(cmap, offset); @@ -4863,7 +5610,8 @@ vfs_drt_get_index(struct vfs_drt_clustermap **cmapp, u_int64_t offset, int *inde { struct vfs_drt_clustermap *cmap; kern_return_t kret; - int index, i; + u_int32_t index; + u_int32_t i; cmap = *cmapp; @@ -4918,7 +5666,7 @@ vfs_drt_do_mark_pages( void **private, u_int64_t offset, u_int length, - int *setcountp, + u_int *setcountp, int dirty) { struct vfs_drt_clustermap *cmap, **cmapp; @@ -5033,7 +5781,7 @@ vfs_drt_do_mark_pages( * Returns KERN_SUCCESS if all the pages were successfully marked. */ static kern_return_t -vfs_drt_mark_pages(void **cmapp, off_t offset, u_int length, int *setcountp) +vfs_drt_mark_pages(void **cmapp, off_t offset, u_int length, u_int *setcountp) { /* XXX size unused, drop from interface */ return(vfs_drt_do_mark_pages(cmapp, offset, length, setcountp, 1)); @@ -5073,7 +5821,8 @@ vfs_drt_get_cluster(void **cmapp, off_t *offsetp, u_int *lengthp) struct vfs_drt_clustermap *cmap; u_int64_t offset; u_int length; - int index, i, j, fs, ls; + u_int32_t j; + int index, i, fs, ls; /* sanity */ if ((cmapp == NULL) || (*cmapp == NULL))