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From: Jan Kara <jack@suse.cz>
To: Dan Williams <dan.j.williams@intel.com>
Cc: linux-xfs@vger.kernel.org, Jan Kara <jack@suse.cz>,
	linux-nvdimm@lists.01.org, linux-api@vger.kernel.org,
	"Darrick J . Wong" <darrick.wong@oracle.com>,
	Christoph Hellwig <hch@infradead.org>,
	linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
	linux-ext4@vger.kernel.org
Subject: [PATCH 10/18] dax: Allow dax_iomap_fault() to return pfn
Date: Wed,  1 Nov 2017 16:36:39 +0100	[thread overview]
Message-ID: <20171101153648.30166-11-jack@suse.cz> (raw)
In-Reply-To: <20171101153648.30166-1-jack@suse.cz>

For synchronous page fault dax_iomap_fault() will need to return PFN
which will then need to be inserted into page tables after fsync()
completes. Add necessary parameter to dax_iomap_fault().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/dax.c            | 13 +++++++------
 fs/ext2/file.c      |  2 +-
 fs/ext4/file.c      |  2 +-
 fs/xfs/xfs_file.c   |  4 ++--
 include/linux/dax.h |  2 +-
 5 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/fs/dax.c b/fs/dax.c
index 5214ed9ba508..5ddf15161390 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1079,7 +1079,7 @@ static int dax_fault_return(int error)
 	return VM_FAULT_SIGBUS;
 }
 
-static int dax_iomap_pte_fault(struct vm_fault *vmf,
+static int dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
 			       const struct iomap_ops *ops)
 {
 	struct vm_area_struct *vma = vmf->vma;
@@ -1280,7 +1280,7 @@ static int dax_pmd_load_hole(struct vm_fault *vmf, struct iomap *iomap,
 	return VM_FAULT_FALLBACK;
 }
 
-static int dax_iomap_pmd_fault(struct vm_fault *vmf,
+static int dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
 			       const struct iomap_ops *ops)
 {
 	struct vm_area_struct *vma = vmf->vma;
@@ -1425,7 +1425,7 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf,
 	return result;
 }
 #else
-static int dax_iomap_pmd_fault(struct vm_fault *vmf,
+static int dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
 			       const struct iomap_ops *ops)
 {
 	return VM_FAULT_FALLBACK;
@@ -1436,6 +1436,7 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf,
  * dax_iomap_fault - handle a page fault on a DAX file
  * @vmf: The description of the fault
  * @pe_size: Size of the page to fault in
+ * @pfnp: PFN to insert for synchronous faults if fsync is required
  * @ops: Iomap ops passed from the file system
  *
  * When a page fault occurs, filesystems may call this helper in
@@ -1444,13 +1445,13 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf,
  * successfully.
  */
 int dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
-		    const struct iomap_ops *ops)
+		    pfn_t *pfnp, const struct iomap_ops *ops)
 {
 	switch (pe_size) {
 	case PE_SIZE_PTE:
-		return dax_iomap_pte_fault(vmf, ops);
+		return dax_iomap_pte_fault(vmf, pfnp, ops);
 	case PE_SIZE_PMD:
-		return dax_iomap_pmd_fault(vmf, ops);
+		return dax_iomap_pmd_fault(vmf, pfnp, ops);
 	default:
 		return VM_FAULT_FALLBACK;
 	}
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index ff3a3636a5ca..d2bb7c96307d 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -99,7 +99,7 @@ static int ext2_dax_fault(struct vm_fault *vmf)
 	}
 	down_read(&ei->dax_sem);
 
-	ret = dax_iomap_fault(vmf, PE_SIZE_PTE, &ext2_iomap_ops);
+	ret = dax_iomap_fault(vmf, PE_SIZE_PTE, NULL, &ext2_iomap_ops);
 
 	up_read(&ei->dax_sem);
 	if (vmf->flags & FAULT_FLAG_WRITE)
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index b1da660ac3bc..3cec0b95672f 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -306,7 +306,7 @@ static int ext4_dax_huge_fault(struct vm_fault *vmf,
 		down_read(&EXT4_I(inode)->i_mmap_sem);
 	}
 	if (!IS_ERR(handle))
-		result = dax_iomap_fault(vmf, pe_size, &ext4_iomap_ops);
+		result = dax_iomap_fault(vmf, pe_size, NULL, &ext4_iomap_ops);
 	else
 		result = VM_FAULT_SIGBUS;
 	if (write) {
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 309e26c9dddb..7c6b8def6eed 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1040,7 +1040,7 @@ __xfs_filemap_fault(
 
 	xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
 	if (IS_DAX(inode)) {
-		ret = dax_iomap_fault(vmf, pe_size, &xfs_iomap_ops);
+		ret = dax_iomap_fault(vmf, pe_size, NULL, &xfs_iomap_ops);
 	} else {
 		if (write_fault)
 			ret = iomap_page_mkwrite(vmf, &xfs_iomap_ops);
@@ -1111,7 +1111,7 @@ xfs_filemap_pfn_mkwrite(
 	if (vmf->pgoff >= size)
 		ret = VM_FAULT_SIGBUS;
 	else if (IS_DAX(inode))
-		ret = dax_iomap_fault(vmf, PE_SIZE_PTE, &xfs_iomap_ops);
+		ret = dax_iomap_fault(vmf, PE_SIZE_PTE, NULL, &xfs_iomap_ops);
 	xfs_iunlock(ip, XFS_MMAPLOCK_SHARED);
 	sb_end_pagefault(inode->i_sb);
 	return ret;
diff --git a/include/linux/dax.h b/include/linux/dax.h
index 122197124b9d..e7fa4b8f45bc 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -95,7 +95,7 @@ bool dax_write_cache_enabled(struct dax_device *dax_dev);
 ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter,
 		const struct iomap_ops *ops);
 int dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
-		    const struct iomap_ops *ops);
+		    pfn_t *pfnp, const struct iomap_ops *ops);
 int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
 int dax_invalidate_mapping_entry_sync(struct address_space *mapping,
 				      pgoff_t index);
-- 
2.12.3

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WARNING: multiple messages have this Message-ID (diff)
From: Jan Kara <jack@suse.cz>
To: Dan Williams <dan.j.williams@intel.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>,
	Christoph Hellwig <hch@infradead.org>,
	<linux-fsdevel@vger.kernel.org>,
	linux-nvdimm@lists.01.org, <linux-mm@kvack.org>,
	linux-api@vger.kernel.org, <linux-ext4@vger.kernel.org>,
	<linux-xfs@vger.kernel.org>,
	"Darrick J . Wong" <darrick.wong@oracle.com>,
	Jan Kara <jack@suse.cz>
Subject: [PATCH 10/18] dax: Allow dax_iomap_fault() to return pfn
Date: Wed,  1 Nov 2017 16:36:39 +0100	[thread overview]
Message-ID: <20171101153648.30166-11-jack@suse.cz> (raw)
In-Reply-To: <20171101153648.30166-1-jack@suse.cz>

For synchronous page fault dax_iomap_fault() will need to return PFN
which will then need to be inserted into page tables after fsync()
completes. Add necessary parameter to dax_iomap_fault().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/dax.c            | 13 +++++++------
 fs/ext2/file.c      |  2 +-
 fs/ext4/file.c      |  2 +-
 fs/xfs/xfs_file.c   |  4 ++--
 include/linux/dax.h |  2 +-
 5 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/fs/dax.c b/fs/dax.c
index 5214ed9ba508..5ddf15161390 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1079,7 +1079,7 @@ static int dax_fault_return(int error)
 	return VM_FAULT_SIGBUS;
 }
 
-static int dax_iomap_pte_fault(struct vm_fault *vmf,
+static int dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
 			       const struct iomap_ops *ops)
 {
 	struct vm_area_struct *vma = vmf->vma;
@@ -1280,7 +1280,7 @@ static int dax_pmd_load_hole(struct vm_fault *vmf, struct iomap *iomap,
 	return VM_FAULT_FALLBACK;
 }
 
-static int dax_iomap_pmd_fault(struct vm_fault *vmf,
+static int dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
 			       const struct iomap_ops *ops)
 {
 	struct vm_area_struct *vma = vmf->vma;
@@ -1425,7 +1425,7 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf,
 	return result;
 }
 #else
-static int dax_iomap_pmd_fault(struct vm_fault *vmf,
+static int dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
 			       const struct iomap_ops *ops)
 {
 	return VM_FAULT_FALLBACK;
@@ -1436,6 +1436,7 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf,
  * dax_iomap_fault - handle a page fault on a DAX file
  * @vmf: The description of the fault
  * @pe_size: Size of the page to fault in
+ * @pfnp: PFN to insert for synchronous faults if fsync is required
  * @ops: Iomap ops passed from the file system
  *
  * When a page fault occurs, filesystems may call this helper in
@@ -1444,13 +1445,13 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf,
  * successfully.
  */
 int dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
-		    const struct iomap_ops *ops)
+		    pfn_t *pfnp, const struct iomap_ops *ops)
 {
 	switch (pe_size) {
 	case PE_SIZE_PTE:
-		return dax_iomap_pte_fault(vmf, ops);
+		return dax_iomap_pte_fault(vmf, pfnp, ops);
 	case PE_SIZE_PMD:
-		return dax_iomap_pmd_fault(vmf, ops);
+		return dax_iomap_pmd_fault(vmf, pfnp, ops);
 	default:
 		return VM_FAULT_FALLBACK;
 	}
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index ff3a3636a5ca..d2bb7c96307d 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -99,7 +99,7 @@ static int ext2_dax_fault(struct vm_fault *vmf)
 	}
 	down_read(&ei->dax_sem);
 
-	ret = dax_iomap_fault(vmf, PE_SIZE_PTE, &ext2_iomap_ops);
+	ret = dax_iomap_fault(vmf, PE_SIZE_PTE, NULL, &ext2_iomap_ops);
 
 	up_read(&ei->dax_sem);
 	if (vmf->flags & FAULT_FLAG_WRITE)
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index b1da660ac3bc..3cec0b95672f 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -306,7 +306,7 @@ static int ext4_dax_huge_fault(struct vm_fault *vmf,
 		down_read(&EXT4_I(inode)->i_mmap_sem);
 	}
 	if (!IS_ERR(handle))
-		result = dax_iomap_fault(vmf, pe_size, &ext4_iomap_ops);
+		result = dax_iomap_fault(vmf, pe_size, NULL, &ext4_iomap_ops);
 	else
 		result = VM_FAULT_SIGBUS;
 	if (write) {
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 309e26c9dddb..7c6b8def6eed 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1040,7 +1040,7 @@ __xfs_filemap_fault(
 
 	xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
 	if (IS_DAX(inode)) {
-		ret = dax_iomap_fault(vmf, pe_size, &xfs_iomap_ops);
+		ret = dax_iomap_fault(vmf, pe_size, NULL, &xfs_iomap_ops);
 	} else {
 		if (write_fault)
 			ret = iomap_page_mkwrite(vmf, &xfs_iomap_ops);
@@ -1111,7 +1111,7 @@ xfs_filemap_pfn_mkwrite(
 	if (vmf->pgoff >= size)
 		ret = VM_FAULT_SIGBUS;
 	else if (IS_DAX(inode))
-		ret = dax_iomap_fault(vmf, PE_SIZE_PTE, &xfs_iomap_ops);
+		ret = dax_iomap_fault(vmf, PE_SIZE_PTE, NULL, &xfs_iomap_ops);
 	xfs_iunlock(ip, XFS_MMAPLOCK_SHARED);
 	sb_end_pagefault(inode->i_sb);
 	return ret;
diff --git a/include/linux/dax.h b/include/linux/dax.h
index 122197124b9d..e7fa4b8f45bc 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -95,7 +95,7 @@ bool dax_write_cache_enabled(struct dax_device *dax_dev);
 ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter,
 		const struct iomap_ops *ops);
 int dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
-		    const struct iomap_ops *ops);
+		    pfn_t *pfnp, const struct iomap_ops *ops);
 int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
 int dax_invalidate_mapping_entry_sync(struct address_space *mapping,
 				      pgoff_t index);
-- 
2.12.3

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WARNING: multiple messages have this Message-ID (diff)
From: Jan Kara <jack-AlSwsSmVLrQ@public.gmane.org>
To: Dan Williams <dan.j.williams-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: linux-xfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Jan Kara <jack-AlSwsSmVLrQ@public.gmane.org>,
	linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org,
	linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	"Darrick J . Wong"
	<darrick.wong-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>,
	Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
	linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
	linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-ext4-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: [PATCH 10/18] dax: Allow dax_iomap_fault() to return pfn
Date: Wed,  1 Nov 2017 16:36:39 +0100	[thread overview]
Message-ID: <20171101153648.30166-11-jack@suse.cz> (raw)
In-Reply-To: <20171101153648.30166-1-jack-AlSwsSmVLrQ@public.gmane.org>

For synchronous page fault dax_iomap_fault() will need to return PFN
which will then need to be inserted into page tables after fsync()
completes. Add necessary parameter to dax_iomap_fault().

Reviewed-by: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Reviewed-by: Ross Zwisler <ross.zwisler-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Signed-off-by: Jan Kara <jack-AlSwsSmVLrQ@public.gmane.org>
---
 fs/dax.c            | 13 +++++++------
 fs/ext2/file.c      |  2 +-
 fs/ext4/file.c      |  2 +-
 fs/xfs/xfs_file.c   |  4 ++--
 include/linux/dax.h |  2 +-
 5 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/fs/dax.c b/fs/dax.c
index 5214ed9ba508..5ddf15161390 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1079,7 +1079,7 @@ static int dax_fault_return(int error)
 	return VM_FAULT_SIGBUS;
 }
 
-static int dax_iomap_pte_fault(struct vm_fault *vmf,
+static int dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
 			       const struct iomap_ops *ops)
 {
 	struct vm_area_struct *vma = vmf->vma;
@@ -1280,7 +1280,7 @@ static int dax_pmd_load_hole(struct vm_fault *vmf, struct iomap *iomap,
 	return VM_FAULT_FALLBACK;
 }
 
-static int dax_iomap_pmd_fault(struct vm_fault *vmf,
+static int dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
 			       const struct iomap_ops *ops)
 {
 	struct vm_area_struct *vma = vmf->vma;
@@ -1425,7 +1425,7 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf,
 	return result;
 }
 #else
-static int dax_iomap_pmd_fault(struct vm_fault *vmf,
+static int dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
 			       const struct iomap_ops *ops)
 {
 	return VM_FAULT_FALLBACK;
@@ -1436,6 +1436,7 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf,
  * dax_iomap_fault - handle a page fault on a DAX file
  * @vmf: The description of the fault
  * @pe_size: Size of the page to fault in
+ * @pfnp: PFN to insert for synchronous faults if fsync is required
  * @ops: Iomap ops passed from the file system
  *
  * When a page fault occurs, filesystems may call this helper in
@@ -1444,13 +1445,13 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf,
  * successfully.
  */
 int dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
-		    const struct iomap_ops *ops)
+		    pfn_t *pfnp, const struct iomap_ops *ops)
 {
 	switch (pe_size) {
 	case PE_SIZE_PTE:
-		return dax_iomap_pte_fault(vmf, ops);
+		return dax_iomap_pte_fault(vmf, pfnp, ops);
 	case PE_SIZE_PMD:
-		return dax_iomap_pmd_fault(vmf, ops);
+		return dax_iomap_pmd_fault(vmf, pfnp, ops);
 	default:
 		return VM_FAULT_FALLBACK;
 	}
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index ff3a3636a5ca..d2bb7c96307d 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -99,7 +99,7 @@ static int ext2_dax_fault(struct vm_fault *vmf)
 	}
 	down_read(&ei->dax_sem);
 
-	ret = dax_iomap_fault(vmf, PE_SIZE_PTE, &ext2_iomap_ops);
+	ret = dax_iomap_fault(vmf, PE_SIZE_PTE, NULL, &ext2_iomap_ops);
 
 	up_read(&ei->dax_sem);
 	if (vmf->flags & FAULT_FLAG_WRITE)
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index b1da660ac3bc..3cec0b95672f 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -306,7 +306,7 @@ static int ext4_dax_huge_fault(struct vm_fault *vmf,
 		down_read(&EXT4_I(inode)->i_mmap_sem);
 	}
 	if (!IS_ERR(handle))
-		result = dax_iomap_fault(vmf, pe_size, &ext4_iomap_ops);
+		result = dax_iomap_fault(vmf, pe_size, NULL, &ext4_iomap_ops);
 	else
 		result = VM_FAULT_SIGBUS;
 	if (write) {
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 309e26c9dddb..7c6b8def6eed 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1040,7 +1040,7 @@ __xfs_filemap_fault(
 
 	xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
 	if (IS_DAX(inode)) {
-		ret = dax_iomap_fault(vmf, pe_size, &xfs_iomap_ops);
+		ret = dax_iomap_fault(vmf, pe_size, NULL, &xfs_iomap_ops);
 	} else {
 		if (write_fault)
 			ret = iomap_page_mkwrite(vmf, &xfs_iomap_ops);
@@ -1111,7 +1111,7 @@ xfs_filemap_pfn_mkwrite(
 	if (vmf->pgoff >= size)
 		ret = VM_FAULT_SIGBUS;
 	else if (IS_DAX(inode))
-		ret = dax_iomap_fault(vmf, PE_SIZE_PTE, &xfs_iomap_ops);
+		ret = dax_iomap_fault(vmf, PE_SIZE_PTE, NULL, &xfs_iomap_ops);
 	xfs_iunlock(ip, XFS_MMAPLOCK_SHARED);
 	sb_end_pagefault(inode->i_sb);
 	return ret;
diff --git a/include/linux/dax.h b/include/linux/dax.h
index 122197124b9d..e7fa4b8f45bc 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -95,7 +95,7 @@ bool dax_write_cache_enabled(struct dax_device *dax_dev);
 ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter,
 		const struct iomap_ops *ops);
 int dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
-		    const struct iomap_ops *ops);
+		    pfn_t *pfnp, const struct iomap_ops *ops);
 int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
 int dax_invalidate_mapping_entry_sync(struct address_space *mapping,
 				      pgoff_t index);
-- 
2.12.3

WARNING: multiple messages have this Message-ID (diff)
From: Jan Kara <jack@suse.cz>
To: Dan Williams <dan.j.williams@intel.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>,
	Christoph Hellwig <hch@infradead.org>,
	linux-fsdevel@vger.kernel.org, linux-nvdimm@lists.01.org,
	linux-mm@kvack.org, linux-api@vger.kernel.org,
	linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org,
	"Darrick J . Wong" <darrick.wong@oracle.com>,
	Jan Kara <jack@suse.cz>
Subject: [PATCH 10/18] dax: Allow dax_iomap_fault() to return pfn
Date: Wed,  1 Nov 2017 16:36:39 +0100	[thread overview]
Message-ID: <20171101153648.30166-11-jack@suse.cz> (raw)
In-Reply-To: <20171101153648.30166-1-jack@suse.cz>

For synchronous page fault dax_iomap_fault() will need to return PFN
which will then need to be inserted into page tables after fsync()
completes. Add necessary parameter to dax_iomap_fault().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/dax.c            | 13 +++++++------
 fs/ext2/file.c      |  2 +-
 fs/ext4/file.c      |  2 +-
 fs/xfs/xfs_file.c   |  4 ++--
 include/linux/dax.h |  2 +-
 5 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/fs/dax.c b/fs/dax.c
index 5214ed9ba508..5ddf15161390 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1079,7 +1079,7 @@ static int dax_fault_return(int error)
 	return VM_FAULT_SIGBUS;
 }
 
-static int dax_iomap_pte_fault(struct vm_fault *vmf,
+static int dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
 			       const struct iomap_ops *ops)
 {
 	struct vm_area_struct *vma = vmf->vma;
@@ -1280,7 +1280,7 @@ static int dax_pmd_load_hole(struct vm_fault *vmf, struct iomap *iomap,
 	return VM_FAULT_FALLBACK;
 }
 
-static int dax_iomap_pmd_fault(struct vm_fault *vmf,
+static int dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
 			       const struct iomap_ops *ops)
 {
 	struct vm_area_struct *vma = vmf->vma;
@@ -1425,7 +1425,7 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf,
 	return result;
 }
 #else
-static int dax_iomap_pmd_fault(struct vm_fault *vmf,
+static int dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
 			       const struct iomap_ops *ops)
 {
 	return VM_FAULT_FALLBACK;
@@ -1436,6 +1436,7 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf,
  * dax_iomap_fault - handle a page fault on a DAX file
  * @vmf: The description of the fault
  * @pe_size: Size of the page to fault in
+ * @pfnp: PFN to insert for synchronous faults if fsync is required
  * @ops: Iomap ops passed from the file system
  *
  * When a page fault occurs, filesystems may call this helper in
@@ -1444,13 +1445,13 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf,
  * successfully.
  */
 int dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
-		    const struct iomap_ops *ops)
+		    pfn_t *pfnp, const struct iomap_ops *ops)
 {
 	switch (pe_size) {
 	case PE_SIZE_PTE:
-		return dax_iomap_pte_fault(vmf, ops);
+		return dax_iomap_pte_fault(vmf, pfnp, ops);
 	case PE_SIZE_PMD:
-		return dax_iomap_pmd_fault(vmf, ops);
+		return dax_iomap_pmd_fault(vmf, pfnp, ops);
 	default:
 		return VM_FAULT_FALLBACK;
 	}
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index ff3a3636a5ca..d2bb7c96307d 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -99,7 +99,7 @@ static int ext2_dax_fault(struct vm_fault *vmf)
 	}
 	down_read(&ei->dax_sem);
 
-	ret = dax_iomap_fault(vmf, PE_SIZE_PTE, &ext2_iomap_ops);
+	ret = dax_iomap_fault(vmf, PE_SIZE_PTE, NULL, &ext2_iomap_ops);
 
 	up_read(&ei->dax_sem);
 	if (vmf->flags & FAULT_FLAG_WRITE)
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index b1da660ac3bc..3cec0b95672f 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -306,7 +306,7 @@ static int ext4_dax_huge_fault(struct vm_fault *vmf,
 		down_read(&EXT4_I(inode)->i_mmap_sem);
 	}
 	if (!IS_ERR(handle))
-		result = dax_iomap_fault(vmf, pe_size, &ext4_iomap_ops);
+		result = dax_iomap_fault(vmf, pe_size, NULL, &ext4_iomap_ops);
 	else
 		result = VM_FAULT_SIGBUS;
 	if (write) {
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 309e26c9dddb..7c6b8def6eed 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1040,7 +1040,7 @@ __xfs_filemap_fault(
 
 	xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
 	if (IS_DAX(inode)) {
-		ret = dax_iomap_fault(vmf, pe_size, &xfs_iomap_ops);
+		ret = dax_iomap_fault(vmf, pe_size, NULL, &xfs_iomap_ops);
 	} else {
 		if (write_fault)
 			ret = iomap_page_mkwrite(vmf, &xfs_iomap_ops);
@@ -1111,7 +1111,7 @@ xfs_filemap_pfn_mkwrite(
 	if (vmf->pgoff >= size)
 		ret = VM_FAULT_SIGBUS;
 	else if (IS_DAX(inode))
-		ret = dax_iomap_fault(vmf, PE_SIZE_PTE, &xfs_iomap_ops);
+		ret = dax_iomap_fault(vmf, PE_SIZE_PTE, NULL, &xfs_iomap_ops);
 	xfs_iunlock(ip, XFS_MMAPLOCK_SHARED);
 	sb_end_pagefault(inode->i_sb);
 	return ret;
diff --git a/include/linux/dax.h b/include/linux/dax.h
index 122197124b9d..e7fa4b8f45bc 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -95,7 +95,7 @@ bool dax_write_cache_enabled(struct dax_device *dax_dev);
 ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter,
 		const struct iomap_ops *ops);
 int dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
-		    const struct iomap_ops *ops);
+		    pfn_t *pfnp, const struct iomap_ops *ops);
 int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
 int dax_invalidate_mapping_entry_sync(struct address_space *mapping,
 				      pgoff_t index);
-- 
2.12.3


WARNING: multiple messages have this Message-ID (diff)
From: Jan Kara <jack@suse.cz>
To: Dan Williams <dan.j.williams@intel.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>,
	Christoph Hellwig <hch@infradead.org>,
	linux-fsdevel@vger.kernel.org, linux-nvdimm@lists.01.org,
	linux-mm@kvack.org, linux-api@vger.kernel.org,
	linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org,
	"Darrick J . Wong" <darrick.wong@oracle.com>,
	Jan Kara <jack@suse.cz>
Subject: [PATCH 10/18] dax: Allow dax_iomap_fault() to return pfn
Date: Wed,  1 Nov 2017 16:36:39 +0100	[thread overview]
Message-ID: <20171101153648.30166-11-jack@suse.cz> (raw)
In-Reply-To: <20171101153648.30166-1-jack@suse.cz>

For synchronous page fault dax_iomap_fault() will need to return PFN
which will then need to be inserted into page tables after fsync()
completes. Add necessary parameter to dax_iomap_fault().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/dax.c            | 13 +++++++------
 fs/ext2/file.c      |  2 +-
 fs/ext4/file.c      |  2 +-
 fs/xfs/xfs_file.c   |  4 ++--
 include/linux/dax.h |  2 +-
 5 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/fs/dax.c b/fs/dax.c
index 5214ed9ba508..5ddf15161390 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1079,7 +1079,7 @@ static int dax_fault_return(int error)
 	return VM_FAULT_SIGBUS;
 }
 
-static int dax_iomap_pte_fault(struct vm_fault *vmf,
+static int dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
 			       const struct iomap_ops *ops)
 {
 	struct vm_area_struct *vma = vmf->vma;
@@ -1280,7 +1280,7 @@ static int dax_pmd_load_hole(struct vm_fault *vmf, struct iomap *iomap,
 	return VM_FAULT_FALLBACK;
 }
 
-static int dax_iomap_pmd_fault(struct vm_fault *vmf,
+static int dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
 			       const struct iomap_ops *ops)
 {
 	struct vm_area_struct *vma = vmf->vma;
@@ -1425,7 +1425,7 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf,
 	return result;
 }
 #else
-static int dax_iomap_pmd_fault(struct vm_fault *vmf,
+static int dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
 			       const struct iomap_ops *ops)
 {
 	return VM_FAULT_FALLBACK;
@@ -1436,6 +1436,7 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf,
  * dax_iomap_fault - handle a page fault on a DAX file
  * @vmf: The description of the fault
  * @pe_size: Size of the page to fault in
+ * @pfnp: PFN to insert for synchronous faults if fsync is required
  * @ops: Iomap ops passed from the file system
  *
  * When a page fault occurs, filesystems may call this helper in
@@ -1444,13 +1445,13 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf,
  * successfully.
  */
 int dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
-		    const struct iomap_ops *ops)
+		    pfn_t *pfnp, const struct iomap_ops *ops)
 {
 	switch (pe_size) {
 	case PE_SIZE_PTE:
-		return dax_iomap_pte_fault(vmf, ops);
+		return dax_iomap_pte_fault(vmf, pfnp, ops);
 	case PE_SIZE_PMD:
-		return dax_iomap_pmd_fault(vmf, ops);
+		return dax_iomap_pmd_fault(vmf, pfnp, ops);
 	default:
 		return VM_FAULT_FALLBACK;
 	}
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index ff3a3636a5ca..d2bb7c96307d 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -99,7 +99,7 @@ static int ext2_dax_fault(struct vm_fault *vmf)
 	}
 	down_read(&ei->dax_sem);
 
-	ret = dax_iomap_fault(vmf, PE_SIZE_PTE, &ext2_iomap_ops);
+	ret = dax_iomap_fault(vmf, PE_SIZE_PTE, NULL, &ext2_iomap_ops);
 
 	up_read(&ei->dax_sem);
 	if (vmf->flags & FAULT_FLAG_WRITE)
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index b1da660ac3bc..3cec0b95672f 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -306,7 +306,7 @@ static int ext4_dax_huge_fault(struct vm_fault *vmf,
 		down_read(&EXT4_I(inode)->i_mmap_sem);
 	}
 	if (!IS_ERR(handle))
-		result = dax_iomap_fault(vmf, pe_size, &ext4_iomap_ops);
+		result = dax_iomap_fault(vmf, pe_size, NULL, &ext4_iomap_ops);
 	else
 		result = VM_FAULT_SIGBUS;
 	if (write) {
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 309e26c9dddb..7c6b8def6eed 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1040,7 +1040,7 @@ __xfs_filemap_fault(
 
 	xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
 	if (IS_DAX(inode)) {
-		ret = dax_iomap_fault(vmf, pe_size, &xfs_iomap_ops);
+		ret = dax_iomap_fault(vmf, pe_size, NULL, &xfs_iomap_ops);
 	} else {
 		if (write_fault)
 			ret = iomap_page_mkwrite(vmf, &xfs_iomap_ops);
@@ -1111,7 +1111,7 @@ xfs_filemap_pfn_mkwrite(
 	if (vmf->pgoff >= size)
 		ret = VM_FAULT_SIGBUS;
 	else if (IS_DAX(inode))
-		ret = dax_iomap_fault(vmf, PE_SIZE_PTE, &xfs_iomap_ops);
+		ret = dax_iomap_fault(vmf, PE_SIZE_PTE, NULL, &xfs_iomap_ops);
 	xfs_iunlock(ip, XFS_MMAPLOCK_SHARED);
 	sb_end_pagefault(inode->i_sb);
 	return ret;
diff --git a/include/linux/dax.h b/include/linux/dax.h
index 122197124b9d..e7fa4b8f45bc 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -95,7 +95,7 @@ bool dax_write_cache_enabled(struct dax_device *dax_dev);
 ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter,
 		const struct iomap_ops *ops);
 int dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
-		    const struct iomap_ops *ops);
+		    pfn_t *pfnp, const struct iomap_ops *ops);
 int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
 int dax_invalidate_mapping_entry_sync(struct address_space *mapping,
 				      pgoff_t index);
-- 
2.12.3

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  parent reply	other threads:[~2017-11-01 15:33 UTC|newest]

Thread overview: 132+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-01 15:36 [PATCH 0/18 v6] dax, ext4, xfs: Synchronous page faults Jan Kara
2017-11-01 15:36 ` Jan Kara
2017-11-01 15:36 ` Jan Kara
2017-11-01 15:36 ` Jan Kara
2017-11-01 15:36 ` Jan Kara
2017-11-01 15:36 ` [PATCH 01/18] mm: introduce MAP_SHARED_VALIDATE, a mechanism to safely define new mmap flags Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-22 12:02   ` Vlastimil Babka
2017-11-22 12:02     ` Vlastimil Babka
2017-11-22 12:02     ` Vlastimil Babka
2017-11-22 12:02     ` Vlastimil Babka
2017-11-22 16:52     ` Dan Williams
2017-11-22 16:52       ` Dan Williams
2017-11-22 16:52       ` Dan Williams
2017-11-22 19:53       ` Matthew Wilcox
2017-11-22 19:53         ` Matthew Wilcox
2017-11-22 19:53         ` Matthew Wilcox
2017-11-22 19:53         ` Matthew Wilcox
2017-11-25 18:45         ` Helge Deller
2017-11-25 18:45           ` Helge Deller
2017-11-27 15:55           ` Vlastimil Babka
2017-11-27 15:55             ` Vlastimil Babka
2017-11-01 15:36 ` [PATCH 02/18] mm: Remove VM_FAULT_HWPOISON_LARGE_MASK Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36 ` [PATCH 03/18] dax: Simplify arguments of dax_insert_mapping() Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36 ` [PATCH 04/18] dax: Factor out getting of pfn out of iomap Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36 ` [PATCH 05/18] dax: Create local variable for VMA in dax_iomap_pte_fault() Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36 ` [PATCH 06/18] dax: Create local variable for vmf->flags & FAULT_FLAG_WRITE test Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36 ` [PATCH 07/18] dax: Inline dax_insert_mapping() into the callsite Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36 ` [PATCH 08/18] dax: Inline dax_pmd_insert_mapping() " Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36 ` [PATCH 09/18] dax: Fix comment describing dax_iomap_fault() Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36 ` Jan Kara [this message]
2017-11-01 15:36   ` [PATCH 10/18] dax: Allow dax_iomap_fault() to return pfn Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36 ` [PATCH 11/18] dax: Allow tuning whether dax_insert_mapping_entry() dirties entry Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36 ` [PATCH 12/18] mm: Define MAP_SYNC and VM_SYNC flags Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36 ` [PATCH 13/18] dax, iomap: Add support for synchronous faults Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36 ` [PATCH 14/18] dax: Implement dax_finish_sync_fault() Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36 ` [PATCH 15/18] ext4: Simplify error handling in ext4_dax_huge_fault() Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36 ` [PATCH 16/18] ext4: Support for synchronous DAX faults Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36 ` [PATCH 17/18] xfs: Implement xfs_filemap_pfn_mkwrite() using __xfs_filemap_fault() Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-14  2:19   ` Darrick J. Wong
2017-11-14  2:19     ` Darrick J. Wong
2017-11-14  2:19     ` Darrick J. Wong
2017-11-14  2:19     ` Darrick J. Wong
2017-11-01 15:36 ` [PATCH 18/18] xfs: support for synchronous DAX faults Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-14  2:19   ` Darrick J. Wong
2017-11-14  2:19     ` Darrick J. Wong
2017-11-01 15:36 ` [PATCH] mmap.2: Add description of MAP_SHARED_VALIDATE and MAP_SYNC Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2017-11-01 15:36   ` Jan Kara
2018-04-12 13:00   ` Michael Kerrisk (man-pages)
2018-04-12 13:00     ` Michael Kerrisk (man-pages)
2018-04-12 13:00     ` Michael Kerrisk (man-pages)
2018-04-12 14:00     ` Ross Zwisler
2018-04-12 14:00       ` Ross Zwisler
2018-04-12 14:22     ` Jan Kara
2018-04-12 14:22       ` Jan Kara
2018-04-12 14:22       ` Jan Kara
2018-04-12 18:20       ` Michael Kerrisk (man-pages)
2018-04-12 18:20         ` Michael Kerrisk (man-pages)
2018-04-12 18:20         ` Michael Kerrisk (man-pages)
2018-04-13 11:17         ` Jan Kara
2018-04-13 11:17           ` Jan Kara
2018-04-13 11:17           ` Jan Kara

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