>-----Original Message----- >From: linux-rdma-owner@xxxxxxxxxxxxxxx [mailto:linux-rdma- >owner@xxxxxxxxxxxxxxx] On Behalf Of Long Li >Sent: Wednesday, May 30, 2018 3:48 PM >To: Steve French <sfrench@xxxxxxxxx>; linux-cifs@xxxxxxxxxxxxxxx; samba- >technical@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux- >rdma@xxxxxxxxxxxxxxx >Cc: Long Li <longli@xxxxxxxxxxxxx> >Subject: [Patch v2 02/15] CIFS: Add support for direct pages in rdata > >From: Long Li <longli@xxxxxxxxxxxxx> > >Add a function to allocate rdata without allocating pages for data >transfer. This gives the caller an option to pass a number of pages >that point to the data buffer. > >rdata is still reponsible for free those pages after it's done. > >Signed-off-by: Long Li <longli@xxxxxxxxxxxxx> >--- > fs/cifs/cifsglob.h | 2 +- > fs/cifs/file.c | 23 ++++++++++++++++++++--- > 2 files changed, 21 insertions(+), 4 deletions(-) > >diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h >index 8d16c3e..56864a87 100644 >--- a/fs/cifs/cifsglob.h >+++ b/fs/cifs/cifsglob.h >@@ -1179,7 +1179,7 @@ struct cifs_readdata { > unsigned int tailsz; > unsigned int credits; > unsigned int nr_pages; >- struct page *pages[]; >+ struct page **pages; > }; > > struct cifs_writedata; >diff --git a/fs/cifs/file.c b/fs/cifs/file.c >index 23fd430..1c98293 100644 >--- a/fs/cifs/file.c >+++ b/fs/cifs/file.c >@@ -2880,13 +2880,13 @@ cifs_strict_writev(struct kiocb *iocb, struct >iov_iter *from) > } > > static struct cifs_readdata * >-cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) >+cifs_readdata_direct_alloc(struct page **pages, work_func_t complete) > { > struct cifs_readdata *rdata; > >- rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages), >- GFP_KERNEL); >+ rdata = kzalloc(sizeof(*rdata), GFP_KERNEL); > if (rdata != NULL) { >+ rdata->pages = pages; > kref_init(&rdata->refcount); > INIT_LIST_HEAD(&rdata->list); > init_completion(&rdata->done); >@@ -2896,6 +2896,22 @@ cifs_readdata_alloc(unsigned int nr_pages, >work_func_t complete) > return rdata; > } > >+static struct cifs_readdata * >+cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) >+{ >+ struct page **pages = >+ kzalloc(sizeof(struct page *) * nr_pages, GFP_KERNEL); >+ struct cifs_readdata *ret = NULL; >+ >+ if (pages) { >+ ret = cifs_readdata_direct_alloc(pages, complete); >+ if (!ret) >+ kfree(pages); >+ } >+ >+ return ret; >+} >+ > void > cifs_readdata_release(struct kref *refcount) > { >@@ -2910,6 +2926,7 @@ cifs_readdata_release(struct kref *refcount) > if (rdata->cfile) > cifsFileInfo_put(rdata->cfile); > >+ kvfree(rdata->pages); Is the kvfree() correct? You use kzalloc() and kfree in cifs_readdata_alloc(). Mike > kfree(rdata); > } > >-- >2.7.4 > >-- >To unsubscribe from this list: send the line "unsubscribe linux-rdma" in >the body of a message to majordomo@xxxxxxxxxxxxxxx >More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
