X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/2d21ac55c334faf3a56e5634905ed6987fc787d4..4d15aeb193b2c68f1d38666c317f8d3734f5f083:/bsd/vm/vnode_pager.c diff --git a/bsd/vm/vnode_pager.c b/bsd/vm/vnode_pager.c index e53ae4e15..b70717b92 100644 --- a/bsd/vm/vnode_pager.c +++ b/bsd/vm/vnode_pager.c @@ -52,9 +52,14 @@ #include /* needs internal due to fhandle_t */ #include #include +#include /* For DKIOC calls */ #include #include +#include +#include +#include +#include #include #include @@ -76,42 +81,115 @@ #include -unsigned int vp_pagein=0; -unsigned int vp_pgodirty=0; -unsigned int vp_pgoclean=0; -unsigned int dp_pgouts=0; /* Default pager pageouts */ -unsigned int dp_pgins=0; /* Default pager pageins */ + +void +vnode_pager_throttle() +{ + struct uthread *ut; + + ut = get_bsdthread_info(current_thread()); + + if (ut->uu_lowpri_window) + throttle_lowpri_io(1); +} + + +boolean_t +vnode_pager_isSSD(vnode_t vp) +{ + if (vp->v_mount->mnt_kern_flag & MNTK_SSD) + return (TRUE); + return (FALSE); +} + +#if CONFIG_IOSCHED +void +vnode_pager_issue_reprioritize_io(struct vnode *devvp, uint64_t blkno, uint32_t len, int priority) +{ + u_int32_t blocksize = 0; + dk_extent_t extent; + dk_set_tier_t set_tier; + int error = 0; + + error = VNOP_IOCTL(devvp, DKIOCGETBLOCKSIZE, (caddr_t)&blocksize, 0, vfs_context_kernel()); + if (error) + return; + + memset(&extent, 0, sizeof(dk_extent_t)); + memset(&set_tier, 0, sizeof(dk_set_tier_t)); + + extent.offset = blkno * (u_int64_t) blocksize; + extent.length = len; + + set_tier.extents = &extent; + set_tier.extentsCount = 1; + set_tier.tier = priority; + + error = VNOP_IOCTL(devvp, DKIOCSETTIER, (caddr_t)&set_tier, 0, vfs_context_kernel()); + return; +} +#endif + +uint32_t +vnode_pager_isinuse(struct vnode *vp) +{ + if (vp->v_usecount > vp->v_kusecount) + return (1); + return (0); +} + +uint32_t +vnode_pager_return_throttle_io_limit(struct vnode *vp, uint32_t *limit) +{ + return(cluster_throttle_io_limit(vp, limit)); +} vm_object_offset_t vnode_pager_get_filesize(struct vnode *vp) { - return (vm_object_offset_t) ubc_getsize(vp); } +extern int safe_getpath(struct vnode *dvp, char *leafname, char *path, int _len, int *truncated_path); + kern_return_t -vnode_pager_get_pathname( +vnode_pager_get_name( struct vnode *vp, char *pathname, - vm_size_t *length_p) + vm_size_t pathname_len, + char *filename, + vm_size_t filename_len, + boolean_t *truncated_path_p) { - int error, len; - - len = (int) *length_p; - error = vn_getpath(vp, pathname, &len); - if (error != 0) { - return KERN_FAILURE; + *truncated_path_p = FALSE; + if (pathname != NULL) { + /* get the path name */ + safe_getpath(vp, NULL, + pathname, (int) pathname_len, + truncated_path_p); + } + if ((pathname == NULL || *truncated_path_p) && + filename != NULL) { + /* get the file name */ + const char *name; + + name = vnode_getname_printable(vp); + strlcpy(filename, name, (size_t) filename_len); + vnode_putname_printable(name); } - *length_p = (vm_size_t) len; return KERN_SUCCESS; } kern_return_t -vnode_pager_get_filename( +vnode_pager_get_mtime( struct vnode *vp, - const char **filename) + struct timespec *current_mtime, + struct timespec *cs_mtime) { - *filename = vp->v_name; + vnode_mtime(vp, current_mtime, vfs_context_current()); + if (cs_mtime != NULL) { + ubc_get_cs_mtime(vp, cs_mtime); + } return KERN_SUCCESS; } @@ -124,12 +202,91 @@ vnode_pager_get_cs_blobs( return KERN_SUCCESS; } +/* + * vnode_trim: + * Used to call the DKIOCUNMAP ioctl on the underlying disk device for the specified vnode. + * Trims the region at offset bytes into the file, for length bytes. + * + * Care must be taken to ensure that the vnode is sufficiently reference counted at the time this + * function is called; no iocounts or usecounts are taken on the vnode. + * This function is non-idempotent in error cases; We cannot un-discard the blocks if only some of them + * are successfully discarded. + */ +u_int32_t vnode_trim ( + struct vnode *vp, + off_t offset, + size_t length) +{ + daddr64_t io_blockno; /* Block number corresponding to the start of the extent */ + size_t io_bytecount; /* Number of bytes in current extent for the specified range */ + size_t trimmed = 0; + off_t current_offset = offset; + size_t remaining_length = length; + int error = 0; + u_int32_t blocksize = 0; + struct vnode *devvp; + dk_extent_t extent; + dk_unmap_t unmap; + + + /* Get the underlying device vnode */ + devvp = vp->v_mount->mnt_devvp; + + /* Figure out the underlying device block size */ + error = VNOP_IOCTL(devvp, DKIOCGETBLOCKSIZE, (caddr_t)&blocksize, 0, vfs_context_kernel()); + if (error) { + goto trim_exit; + } + + /* + * We may not get the entire range from offset -> offset+length in a single + * extent from the blockmap call. Keep looping/going until we are sure we've hit + * the whole range or if we encounter an error. + */ + while (trimmed < length) { + /* + * VNOP_BLOCKMAP will tell us the logical to physical block number mapping for the + * specified offset. It returns blocks in contiguous chunks, so if the logical range is + * broken into multiple extents, it must be called multiple times, increasing the offset + * in each call to ensure that the entire range is covered. + */ + error = VNOP_BLOCKMAP (vp, current_offset, remaining_length, + &io_blockno, &io_bytecount, NULL, VNODE_READ, NULL); + + if (error) { + goto trim_exit; + } + /* + * We have a contiguous run. Prepare & issue the ioctl for the device. + * the DKIOCUNMAP ioctl takes offset in bytes from the start of the device. + */ + memset (&extent, 0, sizeof(dk_extent_t)); + memset (&unmap, 0, sizeof(dk_unmap_t)); + extent.offset = (uint64_t) io_blockno * (u_int64_t) blocksize; + extent.length = io_bytecount; + unmap.extents = &extent; + unmap.extentsCount = 1; + error = VNOP_IOCTL(devvp, DKIOCUNMAP, (caddr_t)&unmap, 0, vfs_context_kernel()); + + if (error) { + goto trim_exit; + } + remaining_length = remaining_length - io_bytecount; + trimmed = trimmed + io_bytecount; + current_offset = current_offset + io_bytecount; + } +trim_exit: + + return error; + +} + pager_return_t vnode_pageout(struct vnode *vp, upl_t upl, - vm_offset_t upl_offset, + upl_offset_t upl_offset, vm_object_offset_t f_offset, - vm_size_t size, + upl_size_t size, int flags, int *errorp) { @@ -140,7 +297,7 @@ vnode_pageout(struct vnode *vp, int isize; int pg_index; int base_index; - int offset; + upl_offset_t offset; upl_page_info_t *pl; vfs_context_t ctx = vfs_context_current(); /* pager context */ @@ -166,20 +323,83 @@ vnode_pageout(struct vnode *vp, * just go ahead and call vnop_pageout since * it has already sorted out the dirty ranges */ - dp_pgouts++; - - KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_START, - size, 1, 0, 0, 0); + KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, + (MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_START, + size, 1, 0, 0, 0); if ( (error_ret = VNOP_PAGEOUT(vp, upl, upl_offset, (off_t)f_offset, (size_t)size, flags, ctx)) ) result = PAGER_ERROR; - KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_END, - size, 1, 0, 0, 0); + KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, + (MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_END, + size, 1, 0, 0, 0); goto out; } + if (upl == NULL) { + int request_flags; + + if (vp->v_mount->mnt_vtable->vfc_vfsflags & VFC_VFSVNOP_PAGEOUTV2) { + /* + * filesystem has requested the new form of VNOP_PAGEOUT for file + * backed objects... we will not grab the UPL befofe calling VNOP_PAGEOUT... + * it is the fileystem's responsibility to grab the range we're denoting + * via 'f_offset' and 'size' into a UPL... this allows the filesystem to first + * take any locks it needs, before effectively locking the pages into a UPL... + */ + KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, + (MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_START, + size, (int)f_offset, 0, 0, 0); + + if ( (error_ret = VNOP_PAGEOUT(vp, NULL, upl_offset, (off_t)f_offset, + size, flags, ctx)) ) { + result = PAGER_ERROR; + } + KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, + (MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_END, + size, 0, 0, 0, 0); + + goto out; + } + if (flags & UPL_MSYNC) + request_flags = UPL_UBC_MSYNC | UPL_RET_ONLY_DIRTY; + else + request_flags = UPL_UBC_PAGEOUT | UPL_RET_ONLY_DIRTY; + + if (ubc_create_upl(vp, f_offset, size, &upl, &pl, request_flags) != KERN_SUCCESS) { + result = PAGER_ERROR; + error_ret = EINVAL; + goto out; + } + upl_offset = 0; + } else + pl = ubc_upl_pageinfo(upl); + + /* + * Ignore any non-present pages at the end of the + * UPL so that we aren't looking at a upl that + * may already have been freed by the preceeding + * aborts/completions. + */ + base_index = upl_offset / PAGE_SIZE; + + for (pg_index = (upl_offset + isize) / PAGE_SIZE; pg_index > base_index;) { + if (upl_page_present(pl, --pg_index)) + break; + if (pg_index == base_index) { + /* + * no pages were returned, so release + * our hold on the upl and leave + */ + if ( !(flags & UPL_NOCOMMIT)) + ubc_upl_abort_range(upl, upl_offset, isize, UPL_ABORT_FREE_ON_EMPTY); + + goto out; + } + } + isize = ((pg_index + 1) - base_index) * PAGE_SIZE; + /* * we come here for pageouts to 'real' files and * for msyncs... the upl may not contain any @@ -187,7 +407,6 @@ vnode_pageout(struct vnode *vp, * through it and find the 'runs' of dirty pages * to call VNOP_PAGEOUT on... */ - pl = ubc_upl_pageinfo(upl); if (ubc_getsize(vp) == 0) { /* @@ -221,29 +440,6 @@ vnode_pageout(struct vnode *vp, } goto out; } - /* - * Ignore any non-present pages at the end of the - * UPL so that we aren't looking at a upl that - * may already have been freed by the preceeding - * aborts/completions. - */ - base_index = upl_offset / PAGE_SIZE; - - for (pg_index = (upl_offset + isize) / PAGE_SIZE; pg_index > base_index;) { - if (upl_page_present(pl, --pg_index)) - break; - if (pg_index == base_index) { - /* - * no pages were returned, so release - * our hold on the upl and leave - */ - if ( !(flags & UPL_NOCOMMIT)) - ubc_upl_abort_range(upl, upl_offset, isize, UPL_ABORT_FREE_ON_EMPTY); - - goto out; - } - } - isize = ((pg_index + 1) - base_index) * PAGE_SIZE; offset = upl_offset; pg_index = base_index; @@ -276,8 +472,6 @@ vnode_pageout(struct vnode *vp, * Note we must not sleep here if the buffer is busy - that is * a lock inversion which causes deadlock. */ - vp_pgoclean++; - #if NFSCLIENT if (vp->v_tag == VT_NFS) /* check with nfs if page is OK to drop */ @@ -305,8 +499,6 @@ vnode_pageout(struct vnode *vp, continue; } - vp_pgodirty++; - num_of_pages = 1; xsize = isize - PAGE_SIZE; @@ -318,17 +510,19 @@ vnode_pageout(struct vnode *vp, } xsize = num_of_pages * PAGE_SIZE; - KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_START, - xsize, (int)f_offset, 0, 0, 0); + KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, + (MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_START, + xsize, (int)f_offset, 0, 0, 0); - if ( (error = VNOP_PAGEOUT(vp, upl, (vm_offset_t)offset, (off_t)f_offset, + if ( (error = VNOP_PAGEOUT(vp, upl, offset, (off_t)f_offset, xsize, flags, ctx)) ) { if (error_ret == 0) error_ret = error; result = PAGER_ERROR; } - KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_END, - xsize, 0, 0, 0, 0); + KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, + (MACHDBG_CODE(DBG_MACH_VM, 1)) | DBG_FUNC_END, + xsize, 0, 0, 0, 0); f_offset += xsize; offset += xsize; @@ -343,19 +537,16 @@ out: } -extern void throttle_lowpri_io(int *lowpri_window,mount_t v_mount); - pager_return_t vnode_pagein( struct vnode *vp, upl_t upl, - vm_offset_t upl_offset, + upl_offset_t upl_offset, vm_object_offset_t f_offset, - vm_size_t size, + upl_size_t size, int flags, int *errorp) { - struct uthread *ut; upl_page_info_t *pl; int result = PAGER_SUCCESS; int error = 0; @@ -365,10 +556,14 @@ vnode_pagein( int first_pg; int xsize; int must_commit = 1; + int ignore_valid_page_check = 0; if (flags & UPL_NOCOMMIT) must_commit = 0; + if (flags & UPL_IGNORE_VALID_PAGE_CHECK) + ignore_valid_page_check = 1; + if (UBCINFOEXISTS(vp) == 0) { result = PAGER_ERROR; error = PAGER_ERROR; @@ -379,24 +574,42 @@ vnode_pagein( goto out; } if (upl == (upl_t)NULL) { - if (size > (MAX_UPL_TRANSFER * PAGE_SIZE)) { - - panic("vnode_pagein: size = %x\n", size); + flags &= ~UPL_NOCOMMIT; + if (size > MAX_UPL_SIZE_BYTES) { result = PAGER_ERROR; error = PAGER_ERROR; goto out; } - ubc_create_upl(vp, f_offset, size, &upl, &pl, UPL_NOBLOCK | UPL_RET_ONLY_ABSENT | UPL_SET_LITE); + if (vp->v_mount->mnt_vtable->vfc_vfsflags & VFC_VFSVNOP_PAGEINV2) { + /* + * filesystem has requested the new form of VNOP_PAGEIN for file + * backed objects... we will not grab the UPL befofe calling VNOP_PAGEIN... + * it is the fileystem's responsibility to grab the range we're denoting + * via 'f_offset' and 'size' into a UPL... this allows the filesystem to first + * take any locks it needs, before effectively locking the pages into a UPL... + * so we pass a NULL into the filesystem instead of a UPL pointer... the 'upl_offset' + * is used to identify the "must have" page in the extent... the filesystem is free + * to clip the extent to better fit the underlying FS blocksize if it desires as + * long as it continues to include the "must have" page... 'f_offset' + 'upl_offset' + * identifies that page + */ + if ( (error = VNOP_PAGEIN(vp, NULL, upl_offset, (off_t)f_offset, + size, flags, vfs_context_current())) ) { + result = PAGER_ERROR; + error = PAGER_ERROR; + } + goto out; + } + ubc_create_upl(vp, f_offset, size, &upl, &pl, UPL_UBC_PAGEIN | UPL_RET_ONLY_ABSENT); if (upl == (upl_t)NULL) { - - panic("vnode_pagein: ubc_create_upl failed\n"); - result = PAGER_ABSENT; error = PAGER_ABSENT; goto out; } + ubc_upl_range_needed(upl, upl_offset / PAGE_SIZE, 1); + upl_offset = 0; first_pg = 0; @@ -405,15 +618,10 @@ vnode_pagein( * are responsible for commiting/aborting it * regardless of what the caller has passed in */ - flags &= ~UPL_NOCOMMIT; must_commit = 1; - - vp_pagein++; } else { pl = ubc_upl_pageinfo(upl); first_pg = upl_offset / PAGE_SIZE; - - dp_pgins++; } pages_in_upl = size / PAGE_SIZE; DTRACE_VM2(pgpgin, int, pages_in_upl, (uint64_t *), NULL); @@ -446,13 +654,19 @@ vnode_pagein( if (upl_page_present(pl, last_pg)) break; } - /* - * skip over 'valid' pages... we don't want to issue I/O for these - */ - for (start_pg = last_pg; last_pg < pages_in_upl; last_pg++) { - if (!upl_valid_page(pl, last_pg)) - break; + + if (ignore_valid_page_check == 1) { + start_pg = last_pg; + } else { + /* + * skip over 'valid' pages... we don't want to issue I/O for these + */ + for (start_pg = last_pg; last_pg < pages_in_upl; last_pg++) { + if (!upl_valid_page(pl, last_pg)) + break; + } } + if (last_pg > start_pg) { /* * we've found a range of valid pages @@ -489,7 +703,7 @@ vnode_pagein( * 'cluster_io' */ for (start_pg = last_pg; last_pg < pages_in_upl; last_pg++) { - if (upl_valid_page(pl, last_pg) || !upl_page_present(pl, last_pg)) + if (( !ignore_valid_page_check && upl_valid_page(pl, last_pg)) || !upl_page_present(pl, last_pg)) break; } if (last_pg > start_pg) { @@ -497,9 +711,27 @@ vnode_pagein( xsize = (last_pg - start_pg) * PAGE_SIZE; xoff = start_pg * PAGE_SIZE; - if ( (error = VNOP_PAGEIN(vp, upl, (vm_offset_t) xoff, + if ( (error = VNOP_PAGEIN(vp, upl, (upl_offset_t) xoff, (off_t)f_offset + xoff, xsize, flags, vfs_context_current())) ) { + /* + * Usually this UPL will be aborted/committed by the lower cluster layer. + * + * a) In the case of decmpfs, however, we may return an error (EAGAIN) to avoid + * a deadlock with another thread already inflating the file. + * + * b) In the case of content protection, EPERM is a valid error and we should respect it. + * + * In those cases, we must take care of our UPL at this layer itself. + */ + if (must_commit) { + if(error == EAGAIN) { + ubc_upl_abort_range(upl, (upl_offset_t) xoff, xsize, UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_RESTART); + } + if(error == EPERM) { + ubc_upl_abort_range(upl, (upl_offset_t) xoff, xsize, UPL_ABORT_FREE_ON_EMPTY | UPL_ABORT_ERROR); + } + } result = PAGER_ERROR; error = PAGER_ERROR; @@ -510,39 +742,9 @@ out: if (errorp) *errorp = result; - ut = get_bsdthread_info(current_thread()); - - if (ut->uu_lowpri_window && ut->v_mount) { - /* - * task is marked as a low priority I/O type - * and the I/O we issued while in this system call - * collided with normal I/O operations... we'll - * delay in order to mitigate the impact of this - * task on the normal operation of the system - */ - throttle_lowpri_io(&ut->uu_lowpri_window,ut->v_mount); - } return (error); } -void -vnode_pager_shutdown(void) -{ - int i; - vnode_t vp; - - for(i = 0; i < MAX_BACKING_STORE; i++) { - vp = (vnode_t)(bs_port_table[i]).vp; - if (vp) { - (bs_port_table[i]).vp = 0; - - /* get rid of macx_swapon() reference */ - vnode_rele(vp); - } - } -} - - void * upl_get_internal_page_list(upl_t upl) {