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: darrick.wong@oracle.com, willy@infradead.org,
viro@zeniv.linux.org.uk, david@fromorbit.com, hch@lst.de,
rgoldwyn@suse.de
Subject: [PATCH v6 3/7] fsdax: Add dax_iomap_cow_copy() for dax_iomap_zero
Date: Wed, 19 May 2021 14:00:41 +0800 [thread overview]
Message-ID: <20210519060045.1051226-4-ruansy.fnst@fujitsu.com> (raw)
In-Reply-To: <20210519060045.1051226-1-ruansy.fnst@fujitsu.com>
Punch hole on a reflinked file needs dax_copy_edge() too. Otherwise,
data in not aligned area will be not correct. So, add the srcmap to
dax_iomap_zero() and replace memset() as dax_copy_edge().
Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com>
Reviewed-by: Ritesh Harjani <riteshh@linux.ibm.com>
---
fs/dax.c | 25 +++++++++++++++----------
fs/iomap/buffered-io.c | 2 +-
include/linux/dax.h | 3 ++-
3 files changed, 18 insertions(+), 12 deletions(-)
diff --git a/fs/dax.c b/fs/dax.c
index 98531c53d613..baee584cb8ae 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1197,7 +1197,8 @@ static vm_fault_t dax_pmd_load_hole(struct xa_state *xas, struct vm_fault *vmf,
}
#endif /* CONFIG_FS_DAX_PMD */
-s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap)
+s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap,
+ struct iomap *srcmap)
{
sector_t sector = iomap_sector(iomap, pos & PAGE_MASK);
pgoff_t pgoff;
@@ -1219,19 +1220,23 @@ s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap)
if (page_aligned)
rc = dax_zero_page_range(iomap->dax_dev, pgoff, 1);
- else
+ else {
rc = dax_direct_access(iomap->dax_dev, pgoff, 1, &kaddr, NULL);
- if (rc < 0) {
- dax_read_unlock(id);
- return rc;
- }
-
- if (!page_aligned) {
- memset(kaddr + offset, 0, size);
+ if (rc < 0)
+ goto out;
+ if (iomap->addr != srcmap->addr) {
+ rc = dax_iomap_cow_copy(pos, size, PAGE_SIZE, srcmap,
+ kaddr);
+ if (rc < 0)
+ goto out;
+ } else
+ memset(kaddr + offset, 0, size);
dax_flush(iomap->dax_dev, kaddr + offset, size);
}
+
+out:
dax_read_unlock(id);
- return size;
+ return rc < 0 ? rc : size;
}
static loff_t
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 9023717c5188..fdaac4ba9b9d 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -933,7 +933,7 @@ static loff_t iomap_zero_range_actor(struct inode *inode, loff_t pos,
s64 bytes;
if (IS_DAX(inode))
- bytes = dax_iomap_zero(pos, length, iomap);
+ bytes = dax_iomap_zero(pos, length, iomap, srcmap);
else
bytes = iomap_zero(inode, pos, length, iomap, srcmap);
if (bytes < 0)
diff --git a/include/linux/dax.h b/include/linux/dax.h
index b52f084aa643..3275e01ed33d 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -237,7 +237,8 @@ vm_fault_t dax_finish_sync_fault(struct vm_fault *vmf,
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);
-s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap);
+s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap,
+ struct iomap *srcmap);
static inline bool dax_mapping(struct address_space *mapping)
{
return mapping->host && IS_DAX(mapping->host);
--
2.31.1
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next prev parent reply other threads:[~2021-05-19 6:01 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-19 6:00 [PATCH v6 0/7] fsdax,xfs: Add reflink&dedupe support for fsdax Shiyang Ruan
2021-05-19 6:00 ` [PATCH v6 1/7] fsdax: Introduce dax_iomap_cow_copy() Shiyang Ruan
2021-05-19 6:00 ` [PATCH v6 2/7] fsdax: Replace mmap entry in case of CoW Shiyang Ruan
2021-05-19 6:00 ` Shiyang Ruan [this message]
2021-05-19 6:00 ` [PATCH v6 4/7] iomap: Introduce iomap_apply2() for operations on two files Shiyang Ruan
2021-05-19 6:00 ` [PATCH v6 5/7] fsdax: Dedup file range to use a compare function Shiyang Ruan
2021-05-19 6:00 ` [PATCH v6 6/7] fs/xfs: Handle CoW for fsdax write() path Shiyang Ruan
2021-05-19 6:00 ` [PATCH v6 7/7] fs/xfs: Add dax dedupe support Shiyang Ruan
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