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fsdax: factor out a dax_memzero helper

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Factor out a helper for the "manual" zeroing of a DAX range to clean
up dax_iomap_zero a lot.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/20211129102203.2243509-18-hch@lst.de
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Christoph Hellwig 2021-11-29 11:21:51 +01:00 committed by Dan Williams
parent 4a2d7d5950
commit e5c71954ca
1 changed files with 19 additions and 17 deletions
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34
fs/dax.c
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@ -1121,34 +1121,36 @@ 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)
{
void *kaddr;
long ret;
ret = dax_direct_access(dax_dev, pgoff, 1, &kaddr, NULL);
if (ret > 0) {
memset(kaddr + offset, 0, size);
dax_flush(dax_dev, kaddr + offset, size);
}
return ret;
}
s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap)
{
pgoff_t pgoff = dax_iomap_pgoff(iomap, pos);
long rc, id;
void *kaddr;
bool page_aligned = false;
unsigned offset = offset_in_page(pos);
unsigned size = min_t(u64, PAGE_SIZE - offset, length);
if (IS_ALIGNED(pos, PAGE_SIZE) && size == PAGE_SIZE)
page_aligned = true;
id = dax_read_lock();
if (page_aligned)
if (IS_ALIGNED(pos, PAGE_SIZE) && size == PAGE_SIZE)
rc = dax_zero_page_range(iomap->dax_dev, pgoff, 1);
else
rc = dax_direct_access(iomap->dax_dev, pgoff, 1, &kaddr, NULL);
if (rc < 0) {
rc = dax_memzero(iomap->dax_dev, pgoff, offset, size);
dax_read_unlock(id);
return rc;
}
if (!page_aligned) {
memset(kaddr + offset, 0, size);
dax_flush(iomap->dax_dev, kaddr + offset, size);
}
dax_read_unlock(id);
if (rc < 0)
return rc;
return size;
}