| Message ID | 20221229-cifs-kmap-v1-1-c70d0e9a53eb@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | cifs: Fix kmap_local_page() unmapping | expand |
Ira Weiny <ira.weiny@intel.com> writes: > kmap_local_page() requires kunmap_local() to unmap the mapping. In > addition memcpy_page() is provided to perform this common memcpy > pattern. > > Replace the kmap_local_page() and broken kunmap() with memcpy_page() > > Fixes: d406d26745ab ("cifs: skip alloc when request has no pages") > Cc: Paulo Alcantara <pc@cjr.nz> > Cc: Steve French <sfrench@samba.org> > Cc: "Fabio M. De Francesco" <fmdefrancesco@gmail.com> > Cc: linux-cifs@vger.kernel.org > Cc: samba-technical@lists.samba.org > Signed-off-by: Ira Weiny <ira.weiny@intel.com> > --- > fs/cifs/smb2ops.c | 9 ++------- > 1 file changed, 2 insertions(+), 7 deletions(-) Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
On giovedì 29 dicembre 2022 23:04:46 CET Ira Weiny wrote: > kmap_local_page() requires kunmap_local() to unmap the mapping. In > addition memcpy_page() is provided to perform this common memcpy > pattern. > > Replace the kmap_local_page() and broken kunmap() with memcpy_page() > > Fixes: d406d26745ab ("cifs: skip alloc when request has no pages") > Cc: Paulo Alcantara <pc@cjr.nz> > Cc: Steve French <sfrench@samba.org> > Cc: "Fabio M. De Francesco" <fmdefrancesco@gmail.com> > Cc: linux-cifs@vger.kernel.org > Cc: samba-technical@lists.samba.org > Signed-off-by: Ira Weiny <ira.weiny@intel.com> > --- > fs/cifs/smb2ops.c | 9 ++------- > 1 file changed, 2 insertions(+), 7 deletions(-) > > diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c > index dc160de7a6de..0d7e9bcd9f34 100644 > --- a/fs/cifs/smb2ops.c > +++ b/fs/cifs/smb2ops.c > @@ -4488,17 +4488,12 @@ smb3_init_transform_rq(struct TCP_Server_Info *server, > int num_rqst, > > /* copy pages form the old */ > for (j = 0; j < npages; j++) { > - char *dst, *src; > unsigned int offset, len; > > rqst_page_get_length(new, j, &len, &offset); > > - dst = kmap_local_page(new->rq_pages[j]) + offset; > - src = kmap_local_page(old->rq_pages[j]) + offset; > - > - memcpy(dst, src, len); > - kunmap(new->rq_pages[j]); > - kunmap(old->rq_pages[j]); > + memcpy_page(new->rq_pages[j], offset, > + old->rq_pages[j], offset, len); > FWIW, it looks good to me... Reviewed-by: Fabio M. De Francesco Thanks, Fabio > } > } > > > --- > base-commit: 1b929c02afd37871d5afb9d498426f83432e71c2 > change-id: 20221229-cifs-kmap-6700dabafcdf > > Best regards, > -- > Ira Weiny <ira.weiny@intel.com>
merged into cifs-2.6.git for-next pending testing On Thu, Dec 29, 2022 at 4:38 PM Fabio M. De Francesco <fmdefrancesco@gmail.com> wrote: > > On giovedì 29 dicembre 2022 23:04:46 CET Ira Weiny wrote: > > kmap_local_page() requires kunmap_local() to unmap the mapping. In > > addition memcpy_page() is provided to perform this common memcpy > > pattern. > > > > Replace the kmap_local_page() and broken kunmap() with memcpy_page() > > > > Fixes: d406d26745ab ("cifs: skip alloc when request has no pages") > > Cc: Paulo Alcantara <pc@cjr.nz> > > Cc: Steve French <sfrench@samba.org> > > Cc: "Fabio M. De Francesco" <fmdefrancesco@gmail.com> > > Cc: linux-cifs@vger.kernel.org > > Cc: samba-technical@lists.samba.org > > Signed-off-by: Ira Weiny <ira.weiny@intel.com> > > --- > > fs/cifs/smb2ops.c | 9 ++------- > > 1 file changed, 2 insertions(+), 7 deletions(-) > > > > diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c > > index dc160de7a6de..0d7e9bcd9f34 100644 > > --- a/fs/cifs/smb2ops.c > > +++ b/fs/cifs/smb2ops.c > > @@ -4488,17 +4488,12 @@ smb3_init_transform_rq(struct TCP_Server_Info > *server, > > int num_rqst, > > > > /* copy pages form the old */ > > for (j = 0; j < npages; j++) { > > - char *dst, *src; > > unsigned int offset, len; > > > > rqst_page_get_length(new, j, &len, &offset); > > > > - dst = kmap_local_page(new->rq_pages[j]) + > offset; > > - src = kmap_local_page(old->rq_pages[j]) + > offset; > > - > > - memcpy(dst, src, len); > > - kunmap(new->rq_pages[j]); > > - kunmap(old->rq_pages[j]); > > + memcpy_page(new->rq_pages[j], offset, > > + old->rq_pages[j], offset, len); > > > FWIW, it looks good to me... > > Reviewed-by: Fabio M. De Francesco > > Thanks, > > Fabio > > } > > } > > > > > > --- > > base-commit: 1b929c02afd37871d5afb9d498426f83432e71c2 > > change-id: 20221229-cifs-kmap-6700dabafcdf > > > > Best regards, > > -- > > Ira Weiny <ira.weiny@intel.com> > > >
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index dc160de7a6de..0d7e9bcd9f34 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -4488,17 +4488,12 @@ smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst, /* copy pages form the old */ for (j = 0; j < npages; j++) { - char *dst, *src; unsigned int offset, len; rqst_page_get_length(new, j, &len, &offset); - dst = kmap_local_page(new->rq_pages[j]) + offset; - src = kmap_local_page(old->rq_pages[j]) + offset; - - memcpy(dst, src, len); - kunmap(new->rq_pages[j]); - kunmap(old->rq_pages[j]); + memcpy_page(new->rq_pages[j], offset, + old->rq_pages[j], offset, len); } }
kmap_local_page() requires kunmap_local() to unmap the mapping. In addition memcpy_page() is provided to perform this common memcpy pattern. Replace the kmap_local_page() and broken kunmap() with memcpy_page() Fixes: d406d26745ab ("cifs: skip alloc when request has no pages") Cc: Paulo Alcantara <pc@cjr.nz> Cc: Steve French <sfrench@samba.org> Cc: "Fabio M. De Francesco" <fmdefrancesco@gmail.com> Cc: linux-cifs@vger.kernel.org Cc: samba-technical@lists.samba.org Signed-off-by: Ira Weiny <ira.weiny@intel.com> --- fs/cifs/smb2ops.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) --- base-commit: 1b929c02afd37871d5afb9d498426f83432e71c2 change-id: 20221229-cifs-kmap-6700dabafcdf Best regards,