| Message ID | 20230713035512.4139457-2-willy@infradead.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | More filesystem folio conversions for 6.6 | expand |
Am Do., 13. Juli 2023 um 06:04 Uhr schrieb Matthew Wilcox (Oracle) <willy@infradead.org>: > These are the folio equivalent of memcpy_to_page() and memcpy_from_page(). > > Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> > --- > include/linux/highmem.h | 44 +++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 44 insertions(+) > > diff --git a/include/linux/highmem.h b/include/linux/highmem.h > index 68da30625a6c..0280f57d4744 100644 > --- a/include/linux/highmem.h > +++ b/include/linux/highmem.h > @@ -439,6 +439,50 @@ static inline void memzero_page(struct page *page, size_t offset, size_t len) > kunmap_local(addr); > } > > +static inline void memcpy_from_folio(char *to, struct folio *folio, > + size_t offset, size_t len) > +{ > + VM_BUG_ON(offset + len > folio_size(folio)); > + > + do { > + char *from = kmap_local_folio(folio, offset); > + size_t chunk = len; > + > + if (folio_test_highmem(folio) && > + (chunk > (PAGE_SIZE - offset_in_page(offset)))) > + chunk = PAGE_SIZE - offset_in_page(offset); > + memcpy(to, from, len); We want memcpy(to, from, chunk) here. > + kunmap_local(from); > + > + from += chunk; > + offset += chunk; > + len -= chunk; > + } while (len > 0); > +} > + > +static inline void memcpy_to_folio(struct folio *folio, size_t offset, > + const char *from, size_t len) > +{ > + VM_BUG_ON(offset + len > folio_size(folio)); > + > + do { > + char *to = kmap_local_folio(folio, offset); > + size_t chunk = len; > + > + if (folio_test_highmem(folio) && > + (chunk > (PAGE_SIZE - offset_in_page(offset)))) > + chunk = PAGE_SIZE - offset_in_page(offset); > + memcpy(to, from, len); And also here. > + kunmap_local(to); > + > + from += chunk; > + offset += chunk; > + len -= chunk; > + } while (len > 0); > + > + flush_dcache_folio(folio); > +} > + > /** > * memcpy_from_file_folio - Copy some bytes from a file folio. > * @to: The destination buffer. > -- > 2.39.2 > Thanks, Andreas
diff --git a/include/linux/highmem.h b/include/linux/highmem.h index 68da30625a6c..0280f57d4744 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -439,6 +439,50 @@ static inline void memzero_page(struct page *page, size_t offset, size_t len) kunmap_local(addr); } +static inline void memcpy_from_folio(char *to, struct folio *folio, + size_t offset, size_t len) +{ + VM_BUG_ON(offset + len > folio_size(folio)); + + do { + char *from = kmap_local_folio(folio, offset); + size_t chunk = len; + + if (folio_test_highmem(folio) && + (chunk > (PAGE_SIZE - offset_in_page(offset)))) + chunk = PAGE_SIZE - offset_in_page(offset); + memcpy(to, from, len); + kunmap_local(from); + + from += chunk; + offset += chunk; + len -= chunk; + } while (len > 0); +} + +static inline void memcpy_to_folio(struct folio *folio, size_t offset, + const char *from, size_t len) +{ + VM_BUG_ON(offset + len > folio_size(folio)); + + do { + char *to = kmap_local_folio(folio, offset); + size_t chunk = len; + + if (folio_test_highmem(folio) && + (chunk > (PAGE_SIZE - offset_in_page(offset)))) + chunk = PAGE_SIZE - offset_in_page(offset); + memcpy(to, from, len); + kunmap_local(to); + + from += chunk; + offset += chunk; + len -= chunk; + } while (len > 0); + + flush_dcache_folio(folio); +} + /** * memcpy_from_file_folio - Copy some bytes from a file folio. * @to: The destination buffer.
These are the folio equivalent of memcpy_to_page() and memcpy_from_page(). Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> --- include/linux/highmem.h | 44 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+)