From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 988582034CF9C for ; Tue, 24 Oct 2017 08:21:48 -0700 (PDT) From: Jan Kara Subject: [PATCH 17/17] xfs: support for synchronous DAX faults Date: Tue, 24 Oct 2017 17:24:14 +0200 Message-Id: <20171024152415.22864-18-jack@suse.cz> In-Reply-To: <20171024152415.22864-1-jack@suse.cz> References: <20171024152415.22864-1-jack@suse.cz> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" To: Dan Williams Cc: linux-xfs@vger.kernel.org, Jan Kara , linux-nvdimm@lists.01.org, linux-api@vger.kernel.org, Christoph Hellwig , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, Christoph Hellwig List-ID: From: Christoph Hellwig Return IOMAP_F_DIRTY from xfs_file_iomap_begin() when asked to prepare blocks for writing and the inode is pinned, and has dirty fields other than the timestamps. In __xfs_filemap_fault() we then detect this case and call dax_finish_sync_fault() to make sure all metadata is committed, and to insert the page table entry. Note that this will also dirty corresponding radix tree entry which is what we want - fsync(2) will still provide data integrity guarantees for applications not using userspace flushing. And applications using userspace flushing can avoid calling fsync(2) and thus avoid the performance overhead. [JK: Added VM_SYNC flag handling] Signed-off-by: Christoph Hellwig Signed-off-by: Jan Kara --- fs/xfs/xfs_file.c | 15 ++++++++++++++- fs/xfs/xfs_iomap.c | 5 +++++ 2 files changed, 19 insertions(+), 1 deletion(-) diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 7c6b8def6eed..02093df4b314 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -44,6 +44,7 @@ #include #include #include +#include static const struct vm_operations_struct xfs_file_vm_ops; @@ -1040,7 +1041,11 @@ __xfs_filemap_fault( xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED); if (IS_DAX(inode)) { - ret = dax_iomap_fault(vmf, pe_size, NULL, &xfs_iomap_ops); + pfn_t pfn; + + ret = dax_iomap_fault(vmf, pe_size, &pfn, &xfs_iomap_ops); + if (ret & VM_FAULT_NEEDDSYNC) + ret = dax_finish_sync_fault(vmf, pe_size, pfn); } else { if (write_fault) ret = iomap_page_mkwrite(vmf, &xfs_iomap_ops); @@ -1131,6 +1136,13 @@ xfs_file_mmap( struct file *filp, struct vm_area_struct *vma) { + /* + * We don't support synchronous mappings for non-DAX files. At least + * until someone comes with a sensible use case. + */ + if (!IS_DAX(file_inode(filp)) && (vma->vm_flags & VM_SYNC)) + return -EOPNOTSUPP; + file_accessed(filp); vma->vm_ops = &xfs_file_vm_ops; if (IS_DAX(file_inode(filp))) @@ -1149,6 +1161,7 @@ const struct file_operations xfs_file_operations = { .compat_ioctl = xfs_file_compat_ioctl, #endif .mmap = xfs_file_mmap, + .mmap_supported_flags = MAP_SYNC, .open = xfs_file_open, .release = xfs_file_release, .fsync = xfs_file_fsync, diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index f179bdf1644d..b43be199fbdf 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -33,6 +33,7 @@ #include "xfs_error.h" #include "xfs_trans.h" #include "xfs_trans_space.h" +#include "xfs_inode_item.h" #include "xfs_iomap.h" #include "xfs_trace.h" #include "xfs_icache.h" @@ -1086,6 +1087,10 @@ xfs_file_iomap_begin( trace_xfs_iomap_found(ip, offset, length, 0, &imap); } + if ((flags & IOMAP_WRITE) && xfs_ipincount(ip) && + (ip->i_itemp->ili_fsync_fields & ~XFS_ILOG_TIMESTAMP)) + iomap->flags |= IOMAP_F_DIRTY; + xfs_bmbt_to_iomap(ip, iomap, &imap); if (shared) -- 2.12.3 _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx2.suse.de ([195.135.220.15]:36150 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932431AbdJXPZf (ORCPT ); Tue, 24 Oct 2017 11:25:35 -0400 From: Jan Kara To: Dan Williams Cc: Ross Zwisler , Christoph Hellwig , , linux-nvdimm@lists.01.org, , , linux-api@vger.kernel.org, , Christoph Hellwig , Jan Kara Subject: [PATCH 17/17] xfs: support for synchronous DAX faults Date: Tue, 24 Oct 2017 17:24:14 +0200 Message-Id: <20171024152415.22864-18-jack@suse.cz> In-Reply-To: <20171024152415.22864-1-jack@suse.cz> References: <20171024152415.22864-1-jack@suse.cz> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: From: Christoph Hellwig Return IOMAP_F_DIRTY from xfs_file_iomap_begin() when asked to prepare blocks for writing and the inode is pinned, and has dirty fields other than the timestamps. In __xfs_filemap_fault() we then detect this case and call dax_finish_sync_fault() to make sure all metadata is committed, and to insert the page table entry. Note that this will also dirty corresponding radix tree entry which is what we want - fsync(2) will still provide data integrity guarantees for applications not using userspace flushing. And applications using userspace flushing can avoid calling fsync(2) and thus avoid the performance overhead. [JK: Added VM_SYNC flag handling] Signed-off-by: Christoph Hellwig Signed-off-by: Jan Kara --- fs/xfs/xfs_file.c | 15 ++++++++++++++- fs/xfs/xfs_iomap.c | 5 +++++ 2 files changed, 19 insertions(+), 1 deletion(-) diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 7c6b8def6eed..02093df4b314 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -44,6 +44,7 @@ #include #include #include +#include static const struct vm_operations_struct xfs_file_vm_ops; @@ -1040,7 +1041,11 @@ __xfs_filemap_fault( xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED); if (IS_DAX(inode)) { - ret = dax_iomap_fault(vmf, pe_size, NULL, &xfs_iomap_ops); + pfn_t pfn; + + ret = dax_iomap_fault(vmf, pe_size, &pfn, &xfs_iomap_ops); + if (ret & VM_FAULT_NEEDDSYNC) + ret = dax_finish_sync_fault(vmf, pe_size, pfn); } else { if (write_fault) ret = iomap_page_mkwrite(vmf, &xfs_iomap_ops); @@ -1131,6 +1136,13 @@ xfs_file_mmap( struct file *filp, struct vm_area_struct *vma) { + /* + * We don't support synchronous mappings for non-DAX files. At least + * until someone comes with a sensible use case. + */ + if (!IS_DAX(file_inode(filp)) && (vma->vm_flags & VM_SYNC)) + return -EOPNOTSUPP; + file_accessed(filp); vma->vm_ops = &xfs_file_vm_ops; if (IS_DAX(file_inode(filp))) @@ -1149,6 +1161,7 @@ const struct file_operations xfs_file_operations = { .compat_ioctl = xfs_file_compat_ioctl, #endif .mmap = xfs_file_mmap, + .mmap_supported_flags = MAP_SYNC, .open = xfs_file_open, .release = xfs_file_release, .fsync = xfs_file_fsync, diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index f179bdf1644d..b43be199fbdf 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -33,6 +33,7 @@ #include "xfs_error.h" #include "xfs_trans.h" #include "xfs_trans_space.h" +#include "xfs_inode_item.h" #include "xfs_iomap.h" #include "xfs_trace.h" #include "xfs_icache.h" @@ -1086,6 +1087,10 @@ xfs_file_iomap_begin( trace_xfs_iomap_found(ip, offset, length, 0, &imap); } + if ((flags & IOMAP_WRITE) && xfs_ipincount(ip) && + (ip->i_itemp->ili_fsync_fields & ~XFS_ILOG_TIMESTAMP)) + iomap->flags |= IOMAP_F_DIRTY; + xfs_bmbt_to_iomap(ip, iomap, &imap); if (shared) -- 2.12.3 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx2.suse.de ([195.135.220.15]:36150 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932431AbdJXPZf (ORCPT ); Tue, 24 Oct 2017 11:25:35 -0400 From: Jan Kara Subject: [PATCH 17/17] xfs: support for synchronous DAX faults Date: Tue, 24 Oct 2017 17:24:14 +0200 Message-Id: <20171024152415.22864-18-jack@suse.cz> In-Reply-To: <20171024152415.22864-1-jack@suse.cz> References: <20171024152415.22864-1-jack@suse.cz> Sender: linux-xfs-owner@vger.kernel.org List-ID: List-Id: xfs To: Dan Williams Cc: Ross Zwisler , Christoph Hellwig , linux-ext4@vger.kernel.org, linux-nvdimm@lists.01.org, linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-api@vger.kernel.org, linux-mm@kvack.org, Christoph Hellwig , Jan Kara From: Christoph Hellwig Return IOMAP_F_DIRTY from xfs_file_iomap_begin() when asked to prepare blocks for writing and the inode is pinned, and has dirty fields other than the timestamps. In __xfs_filemap_fault() we then detect this case and call dax_finish_sync_fault() to make sure all metadata is committed, and to insert the page table entry. Note that this will also dirty corresponding radix tree entry which is what we want - fsync(2) will still provide data integrity guarantees for applications not using userspace flushing. And applications using userspace flushing can avoid calling fsync(2) and thus avoid the performance overhead. [JK: Added VM_SYNC flag handling] Signed-off-by: Christoph Hellwig Signed-off-by: Jan Kara --- fs/xfs/xfs_file.c | 15 ++++++++++++++- fs/xfs/xfs_iomap.c | 5 +++++ 2 files changed, 19 insertions(+), 1 deletion(-) diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 7c6b8def6eed..02093df4b314 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -44,6 +44,7 @@ #include #include #include +#include static const struct vm_operations_struct xfs_file_vm_ops; @@ -1040,7 +1041,11 @@ __xfs_filemap_fault( xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED); if (IS_DAX(inode)) { - ret = dax_iomap_fault(vmf, pe_size, NULL, &xfs_iomap_ops); + pfn_t pfn; + + ret = dax_iomap_fault(vmf, pe_size, &pfn, &xfs_iomap_ops); + if (ret & VM_FAULT_NEEDDSYNC) + ret = dax_finish_sync_fault(vmf, pe_size, pfn); } else { if (write_fault) ret = iomap_page_mkwrite(vmf, &xfs_iomap_ops); @@ -1131,6 +1136,13 @@ xfs_file_mmap( struct file *filp, struct vm_area_struct *vma) { + /* + * We don't support synchronous mappings for non-DAX files. At least + * until someone comes with a sensible use case. + */ + if (!IS_DAX(file_inode(filp)) && (vma->vm_flags & VM_SYNC)) + return -EOPNOTSUPP; + file_accessed(filp); vma->vm_ops = &xfs_file_vm_ops; if (IS_DAX(file_inode(filp))) @@ -1149,6 +1161,7 @@ const struct file_operations xfs_file_operations = { .compat_ioctl = xfs_file_compat_ioctl, #endif .mmap = xfs_file_mmap, + .mmap_supported_flags = MAP_SYNC, .open = xfs_file_open, .release = xfs_file_release, .fsync = xfs_file_fsync, diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index f179bdf1644d..b43be199fbdf 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -33,6 +33,7 @@ #include "xfs_error.h" #include "xfs_trans.h" #include "xfs_trans_space.h" +#include "xfs_inode_item.h" #include "xfs_iomap.h" #include "xfs_trace.h" #include "xfs_icache.h" @@ -1086,6 +1087,10 @@ xfs_file_iomap_begin( trace_xfs_iomap_found(ip, offset, length, 0, &imap); } + if ((flags & IOMAP_WRITE) && xfs_ipincount(ip) && + (ip->i_itemp->ili_fsync_fields & ~XFS_ILOG_TIMESTAMP)) + iomap->flags |= IOMAP_F_DIRTY; + xfs_bmbt_to_iomap(ip, iomap, &imap); if (shared) -- 2.12.3 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f70.google.com (mail-wm0-f70.google.com [74.125.82.70]) by kanga.kvack.org (Postfix) with ESMTP id 4DE216B0281 for ; Tue, 24 Oct 2017 11:27:09 -0400 (EDT) Received: by mail-wm0-f70.google.com with SMTP id n8so2423387wmg.4 for ; Tue, 24 Oct 2017 08:27:09 -0700 (PDT) Received: from mx2.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id s63si370341wmb.56.2017.10.24.08.25.29 for (version=TLS1 cipher=AES128-SHA bits=128/128); Tue, 24 Oct 2017 08:25:29 -0700 (PDT) From: Jan Kara Subject: [PATCH 17/17] xfs: support for synchronous DAX faults Date: Tue, 24 Oct 2017 17:24:14 +0200 Message-Id: <20171024152415.22864-18-jack@suse.cz> In-Reply-To: <20171024152415.22864-1-jack@suse.cz> References: <20171024152415.22864-1-jack@suse.cz> Sender: owner-linux-mm@kvack.org List-ID: To: Dan Williams Cc: Ross Zwisler , Christoph Hellwig , linux-ext4@vger.kernel.org, linux-nvdimm@lists.01.org, linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-api@vger.kernel.org, linux-mm@kvack.org, Christoph Hellwig , Jan Kara From: Christoph Hellwig Return IOMAP_F_DIRTY from xfs_file_iomap_begin() when asked to prepare blocks for writing and the inode is pinned, and has dirty fields other than the timestamps. In __xfs_filemap_fault() we then detect this case and call dax_finish_sync_fault() to make sure all metadata is committed, and to insert the page table entry. Note that this will also dirty corresponding radix tree entry which is what we want - fsync(2) will still provide data integrity guarantees for applications not using userspace flushing. And applications using userspace flushing can avoid calling fsync(2) and thus avoid the performance overhead. [JK: Added VM_SYNC flag handling] Signed-off-by: Christoph Hellwig Signed-off-by: Jan Kara --- fs/xfs/xfs_file.c | 15 ++++++++++++++- fs/xfs/xfs_iomap.c | 5 +++++ 2 files changed, 19 insertions(+), 1 deletion(-) diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 7c6b8def6eed..02093df4b314 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -44,6 +44,7 @@ #include #include #include +#include static const struct vm_operations_struct xfs_file_vm_ops; @@ -1040,7 +1041,11 @@ __xfs_filemap_fault( xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED); if (IS_DAX(inode)) { - ret = dax_iomap_fault(vmf, pe_size, NULL, &xfs_iomap_ops); + pfn_t pfn; + + ret = dax_iomap_fault(vmf, pe_size, &pfn, &xfs_iomap_ops); + if (ret & VM_FAULT_NEEDDSYNC) + ret = dax_finish_sync_fault(vmf, pe_size, pfn); } else { if (write_fault) ret = iomap_page_mkwrite(vmf, &xfs_iomap_ops); @@ -1131,6 +1136,13 @@ xfs_file_mmap( struct file *filp, struct vm_area_struct *vma) { + /* + * We don't support synchronous mappings for non-DAX files. At least + * until someone comes with a sensible use case. + */ + if (!IS_DAX(file_inode(filp)) && (vma->vm_flags & VM_SYNC)) + return -EOPNOTSUPP; + file_accessed(filp); vma->vm_ops = &xfs_file_vm_ops; if (IS_DAX(file_inode(filp))) @@ -1149,6 +1161,7 @@ const struct file_operations xfs_file_operations = { .compat_ioctl = xfs_file_compat_ioctl, #endif .mmap = xfs_file_mmap, + .mmap_supported_flags = MAP_SYNC, .open = xfs_file_open, .release = xfs_file_release, .fsync = xfs_file_fsync, diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index f179bdf1644d..b43be199fbdf 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -33,6 +33,7 @@ #include "xfs_error.h" #include "xfs_trans.h" #include "xfs_trans_space.h" +#include "xfs_inode_item.h" #include "xfs_iomap.h" #include "xfs_trace.h" #include "xfs_icache.h" @@ -1086,6 +1087,10 @@ xfs_file_iomap_begin( trace_xfs_iomap_found(ip, offset, length, 0, &imap); } + if ((flags & IOMAP_WRITE) && xfs_ipincount(ip) && + (ip->i_itemp->ili_fsync_fields & ~XFS_ILOG_TIMESTAMP)) + iomap->flags |= IOMAP_F_DIRTY; + xfs_bmbt_to_iomap(ip, iomap, &imap); if (shared) -- 2.12.3 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. 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