ocfs2-devel.oss.oracle.com archive mirror
 help / color / mirror / Atom feed
From: Shiyang Ruan <ruansy.fnst@fujitsu.com>
To: <linux-kernel@vger.kernel.org>, <linux-xfs@vger.kernel.org>,
	<linux-nvdimm@lists.01.org>, <linux-fsdevel@vger.kernel.org>
Cc: jack@suse.cz, darrick.wong@oracle.com, david@fromorbit.com,
	ocfs2-devel@oss.oracle.com, viro@zeniv.linux.org.uk,
	dan.j.williams@intel.com, linux-btrfs@vger.kernel.org
Subject: [Ocfs2-devel] [PATCH v3 03/10] fsdax: Output address in dax_iomap_pfn() and rename it
Date: Fri, 19 Mar 2021 09:52:30 +0800	[thread overview]
Message-ID: <20210319015237.993880-4-ruansy.fnst@fujitsu.com> (raw)
In-Reply-To: <20210319015237.993880-1-ruansy.fnst@fujitsu.com>

Add address output in dax_iomap_pfn() in order to perform a memcpy() in
CoW case.  Since this function both output address and pfn, rename it to
dax_iomap_direct_access().

Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 fs/dax.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/fs/dax.c b/fs/dax.c
index 33ddad0f3091..a70e6aa285bb 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -997,8 +997,8 @@ static sector_t dax_iomap_sector(struct iomap *iomap, loff_t pos)
 	return (iomap->addr + (pos & PAGE_MASK) - iomap->offset) >> 9;
 }
 
-static int dax_iomap_pfn(struct iomap *iomap, loff_t pos, size_t size,
-			 pfn_t *pfnp)
+static int dax_iomap_direct_access(struct iomap *iomap, loff_t pos, size_t size,
+		void **kaddr, pfn_t *pfnp)
 {
 	const sector_t sector = dax_iomap_sector(iomap, pos);
 	pgoff_t pgoff;
@@ -1010,11 +1010,13 @@ static int dax_iomap_pfn(struct iomap *iomap, loff_t pos, size_t size,
 		return rc;
 	id = dax_read_lock();
 	length = dax_direct_access(iomap->dax_dev, pgoff, PHYS_PFN(size),
-				   NULL, pfnp);
+				   kaddr, pfnp);
 	if (length < 0) {
 		rc = length;
 		goto out;
 	}
+	if (!pfnp)
+		goto out_check_addr;
 	rc = -EINVAL;
 	if (PFN_PHYS(length) < size)
 		goto out;
@@ -1024,6 +1026,12 @@ static int dax_iomap_pfn(struct iomap *iomap, loff_t pos, size_t size,
 	if (length > 1 && !pfn_t_devmap(*pfnp))
 		goto out;
 	rc = 0;
+
+out_check_addr:
+	if (!kaddr)
+		goto out;
+	if (!*kaddr)
+		rc = -EFAULT;
 out:
 	dax_read_unlock(id);
 	return rc;
@@ -1386,7 +1394,7 @@ static vm_fault_t dax_fault_actor(struct vm_fault *vmf, pfn_t *pfnp,
 		return VM_FAULT_SIGBUS;
 	}
 
-	err = dax_iomap_pfn(iomap, pos, size, &pfn);
+	err = dax_iomap_direct_access(iomap, pos, size, NULL, &pfn);
 	if (err)
 		return dax_fault_return(err);
 
-- 
2.30.1




_______________________________________________
Ocfs2-devel mailing list
Ocfs2-devel@oss.oracle.com
https://oss.oracle.com/mailman/listinfo/ocfs2-devel

  parent reply	other threads:[~2021-03-19  1:53 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-19  1:52 [Ocfs2-devel] [PATCH v3 00/10] fsdax, xfs: Add reflink&dedupe support for fsdax Shiyang Ruan
2021-03-19  1:52 ` [Ocfs2-devel] [PATCH v3 01/10] fsdax: Factor helpers to simplify dax fault code Shiyang Ruan
2021-03-23 15:33   ` Ritesh Harjani
2021-03-19  1:52 ` [Ocfs2-devel] [PATCH v3 02/10] fsdax: Factor helper: dax_fault_actor() Shiyang Ruan
2021-03-23 15:48   ` Ritesh Harjani
2021-03-31  3:57     ` ruansy.fnst
2021-04-02  7:47   ` Christoph Hellwig
2021-03-19  1:52 ` Shiyang Ruan [this message]
2021-03-23 15:54   ` [Ocfs2-devel] [PATCH v3 03/10] fsdax: Output address in dax_iomap_pfn() and rename it Ritesh Harjani
2021-03-19  1:52 ` [Ocfs2-devel] [PATCH v3 04/10] fsdax: Introduce dax_iomap_cow_copy() Shiyang Ruan
2021-03-23 16:08   ` Ritesh Harjani
2021-03-19  1:52 ` [Ocfs2-devel] [PATCH v3 05/10] fsdax: Replace mmap entry in case of CoW Shiyang Ruan
2021-04-01  6:39   ` Ritesh Harjani
2021-04-01  7:03     ` ruansy.fnst
2021-03-19  1:52 ` [Ocfs2-devel] [PATCH v3 06/10] fsdax: Add dax_iomap_cow_copy() for dax_iomap_zero Shiyang Ruan
2021-04-01  6:45   ` Ritesh Harjani
2021-04-01  7:00     ` ruansy.fnst
2021-03-19  1:52 ` [Ocfs2-devel] [PATCH v3 07/10] iomap: Introduce iomap_apply2() for operations on two files Shiyang Ruan
2021-04-01  7:12   ` Ritesh Harjani
2021-03-19  1:52 ` [Ocfs2-devel] [PATCH v3 08/10] fsdax: Dedup file range to use a compare function Shiyang Ruan
2021-04-01 11:11   ` Ritesh Harjani
2021-04-08  3:21     ` ruansy.fnst
2021-03-19  1:52 ` [Ocfs2-devel] [PATCH v3 09/10] fs/xfs: Handle CoW for fsdax write() path Shiyang Ruan
2021-03-19  1:52 ` [Ocfs2-devel] [PATCH v3 10/10] fs/xfs: Add dedupe support for fsdax Shiyang Ruan
2021-03-23 15:27 ` [Ocfs2-devel] [PATCH v3 00/10] fsdax, xfs: Add reflink&dedupe " Ritesh Harjani
2021-04-02  7:49 ` Christoph Hellwig
2021-04-02  8:18   ` ruansy.fnst

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210319015237.993880-4-ruansy.fnst@fujitsu.com \
    --to=ruansy.fnst@fujitsu.com \
    --cc=dan.j.williams@intel.com \
    --cc=darrick.wong@oracle.com \
    --cc=david@fromorbit.com \
    --cc=jack@suse.cz \
    --cc=linux-btrfs@vger.kernel.org \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-nvdimm@lists.01.org \
    --cc=linux-xfs@vger.kernel.org \
    --cc=ocfs2-devel@oss.oracle.com \
    --cc=viro@zeniv.linux.org.uk \
    --subject='Re: [Ocfs2-devel] [PATCH v3 03/10] fsdax: Output address in dax_iomap_pfn() and rename it' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).