| Message ID | 20210319015237.993880-7-ruansy.fnst@fujitsu.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | fsdax, xfs: Add reflink&dedupe support for fsdax | expand |
On 21/03/19 09:52AM, Shiyang Ruan wrote: > 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> > --- > fs/dax.c | 9 +++++++-- > fs/iomap/buffered-io.c | 2 +- > include/linux/dax.h | 3 ++- > 3 files changed, 10 insertions(+), 4 deletions(-) > > diff --git a/fs/dax.c b/fs/dax.c > index cfe513eb111e..348297b38f76 100644 > --- a/fs/dax.c > +++ b/fs/dax.c > @@ -1174,7 +1174,8 @@ 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) Do we know why does dax_iomap_zero() operates on PAGE_SIZE range? IIUC, dax_zero_page_range() can take nr_pages as a parameter. But we still always use one page at a time. Why is that? > { > sector_t sector = iomap_sector(iomap, pos & PAGE_MASK); > pgoff_t pgoff; > @@ -1204,7 +1205,11 @@ s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap) > } > > if (!page_aligned) { > - memset(kaddr + offset, 0, size); > + if (iomap->addr != srcmap->addr) > + dax_iomap_cow_copy(offset, size, PAGE_SIZE, srcmap, > + kaddr, true); > + else > + memset(kaddr + offset, 0, size); > dax_flush(iomap->dax_dev, kaddr + offset, size); > } > dax_read_unlock(id); > Maybe the above could be simplified to this? if (page_aligned) { rc = dax_zero_page_range(iomap->dax_dev, pgoff, 1); } else { rc = dax_direct_access(iomap->dax_dev, pgoff, 1, &kaddr, NULL); if (iomap->addr != srcmap->addr) dax_iomap_cow_copy(offset, size, PAGE_SIZE, srcmap, kaddr, true); else memset(kaddr + offset, 0, size); dax_flush(iomap->dax_dev, kaddr + offset, size); } dax_read_unlock(id); return rc < 0 ? rc : size; Other than that looks good. Feel free to add. Reviewed-by: Ritesh Harjani <ritesh.list@gmail.com>
> -----Original Message----- > From: Ritesh Harjani <ritesh.list@gmail.com> > Sent: Thursday, April 1, 2021 2:45 PM > Subject: Re: [PATCH v3 06/10] fsdax: Add dax_iomap_cow_copy() for > dax_iomap_zero > > On 21/03/19 09:52AM, Shiyang Ruan wrote: > > 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> > > --- > > fs/dax.c | 9 +++++++-- > > fs/iomap/buffered-io.c | 2 +- > > include/linux/dax.h | 3 ++- > > 3 files changed, 10 insertions(+), 4 deletions(-) > > > > diff --git a/fs/dax.c b/fs/dax.c > > index cfe513eb111e..348297b38f76 100644 > > --- a/fs/dax.c > > +++ b/fs/dax.c > > @@ -1174,7 +1174,8 @@ 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) > > Do we know why does dax_iomap_zero() operates on PAGE_SIZE range? > IIUC, dax_zero_page_range() can take nr_pages as a parameter. But we still > always use one page at a time. Why is that? I think we can handle more than one page here. The length can be more than one PAGE_SIZE. > > > { > > sector_t sector = iomap_sector(iomap, pos & PAGE_MASK); > > pgoff_t pgoff; > > @@ -1204,7 +1205,11 @@ s64 dax_iomap_zero(loff_t pos, u64 length, struct > iomap *iomap) > > } > > > > if (!page_aligned) { > > - memset(kaddr + offset, 0, size); > > + if (iomap->addr != srcmap->addr) > > + dax_iomap_cow_copy(offset, size, PAGE_SIZE, srcmap, > > + kaddr, true); > > + else > > + memset(kaddr + offset, 0, size); > > dax_flush(iomap->dax_dev, kaddr + offset, size); > > } > > dax_read_unlock(id); > > > > Maybe the above could be simplified to this? > > if (page_aligned) { > rc = dax_zero_page_range(iomap->dax_dev, pgoff, 1); > } else { > rc = dax_direct_access(iomap->dax_dev, pgoff, 1, &kaddr, NULL); This looks good. Need add check for rc here. > if (iomap->addr != srcmap->addr) > dax_iomap_cow_copy(offset, size, PAGE_SIZE, srcmap, > kaddr, true); > else > memset(kaddr + offset, 0, size); > dax_flush(iomap->dax_dev, kaddr + offset, size); > } > > dax_read_unlock(id); > return rc < 0 ? rc : size; > > Other than that looks good. > Feel free to add. > Reviewed-by: Ritesh Harjani <ritesh.list@gmail.com> > -- Thanks, Ruan Shiyang.
diff --git a/fs/dax.c b/fs/dax.c index cfe513eb111e..348297b38f76 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -1174,7 +1174,8 @@ 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; @@ -1204,7 +1205,11 @@ s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap) } if (!page_aligned) { - memset(kaddr + offset, 0, size); + if (iomap->addr != srcmap->addr) + dax_iomap_cow_copy(offset, size, PAGE_SIZE, srcmap, + kaddr, true); + else + memset(kaddr + offset, 0, size); dax_flush(iomap->dax_dev, kaddr + offset, size); } dax_read_unlock(id); diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 16a1e82e3aeb..d754b1f1a05d 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);
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> --- fs/dax.c | 9 +++++++-- fs/iomap/buffered-io.c | 2 +- include/linux/dax.h | 3 ++- 3 files changed, 10 insertions(+), 4 deletions(-)