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fsdax: add dax_iomap_cow_copy() for dax zero 

Punch hole on a reflinked file needs dax_iomap_cow_copy() too.  Otherwise,
data in not aligned area will be not correct.  So, add the CoW operation
for not aligned case in dax_memzero().

Link: https://lkml.kernel.org/r/20220603053738.1218681-12-ruansy.fnst@fujitsu.com
Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com>
Reviewed-by: Ritesh Harjani <riteshh@linux.ibm.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Dan Williams <dan.j.wiliams@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Goldwyn Rodrigues <rgoldwyn@suse.com>
Cc: Goldwyn Rodrigues <rgoldwyn@suse.de>
Cc: Jane Chu <jane.chu@oracle.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Shiyang Ruan 2022-06-03 13:37:35 +08:00 committed by akpm
parent e5d6df7330
commit 8dbfc76da3
1 changed files with 19 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
fs/dax.c
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@ -1221,17 +1221,28 @@ static vm_fault_t dax_pmd_load_hole(struct xa_state *xas, struct vm_fault *vmf,
}
#endif /* CONFIG_FS_DAX_PMD */
static int dax_memzero(struct dax_device *dax_dev, pgoff_t pgoff,
unsigned int offset, size_t size)
static int dax_memzero(struct iomap_iter *iter, loff_t pos, size_t size)
{
const struct iomap *iomap = &iter->iomap;
const struct iomap *srcmap = iomap_iter_srcmap(iter);
unsigned offset = offset_in_page(pos);
pgoff_t pgoff = dax_iomap_pgoff(iomap, pos);
void *kaddr;
long ret;
ret = dax_direct_access(dax_dev, pgoff, 1, DAX_ACCESS, &kaddr, NULL);
if (ret > 0) {
memset(kaddr + offset, 0, size);
dax_flush(dax_dev, kaddr + offset, size);
}
ret = dax_direct_access(iomap->dax_dev, pgoff, 1, DAX_ACCESS, &kaddr,
NULL);
if (ret < 0)
return ret;
memset(kaddr + offset, 0, size);
if (srcmap->addr != iomap->addr) {
ret = dax_iomap_cow_copy(pos, size, PAGE_SIZE, srcmap,
kaddr);
if (ret < 0)
return ret;
dax_flush(iomap->dax_dev, kaddr, PAGE_SIZE);
} else
dax_flush(iomap->dax_dev, kaddr + offset, size);
return ret;
}
@ -1258,7 +1269,7 @@ static s64 dax_zero_iter(struct iomap_iter *iter, bool *did_zero)
if (IS_ALIGNED(pos, PAGE_SIZE) && size == PAGE_SIZE)
rc = dax_zero_page_range(iomap->dax_dev, pgoff, 1);
else
rc = dax_memzero(iomap->dax_dev, pgoff, offset, size);
rc = dax_memzero(iter, pos, size);
dax_read_unlock(id);
if (rc < 0)