From: Long Li <longli@microsoft.com>
To: "Ruhl, Michael J" <michael.j.ruhl@intel.com>,
Steve French <sfrench@samba.org>,
"linux-cifs@vger.kernel.org" <linux-cifs@vger.kernel.org>,
"samba-technical@lists.samba.org"
<samba-technical@lists.samba.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>
Subject: RE: [Patch v2 02/15] CIFS: Add support for direct pages in rdata
Date: Wed, 30 May 2018 20:57:59 +0000 [thread overview]
Message-ID: <SN4PR2101MB07338FEF563C5EE974191591CE6C0@SN4PR2101MB0733.namprd21.prod.outlook.com> (raw)
In-Reply-To: <14063C7AD467DE4B82DEDB5C278E8663B38F01CD@FMSMSX108.amr.corp.intel.com>
> Subject: RE: [Patch v2 02/15] CIFS: Add support for direct pages in rdata
>
> >-----Original Message-----
> >From: linux-rdma-owner@vger.kernel.org [mailto:linux-rdma-
> >owner@vger.kernel.org] On Behalf Of Long Li
> >Sent: Wednesday, May 30, 2018 3:48 PM
> >To: Steve French <sfrench@samba.org>; linux-cifs@vger.kernel.org;
> >samba- technical@lists.samba.org; linux-kernel@vger.kernel.org; linux-
> >rdma@vger.kernel.org
> >Cc: Long Li <longli@microsoft.com>
> >Subject: [Patch v2 02/15] CIFS: Add support for direct pages in rdata
> >
> >From: Long Li <longli@microsoft.com>
> >
> >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@microsoft.com>
> >---
> > 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().
This function is shared by both non-direct I/O and direct I/O code paths.
Direct I/O uses kvmalloc to allocate pages, so kvfree is used here to handle both cases.
>
> Mike
>
> > kfree(rdata);
> > }
> >
> >--
> >2.7.4
> >
> >--
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> >info at
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> e
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next prev parent reply other threads:[~2018-05-30 20:57 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-30 19:47 [Patch v2 00/15] CIFS: Add direct I/O support Long Li
2018-05-30 19:47 ` [Patch v2 01/15] CIFS: Introduce offset for the 1st page in data transfer structures Long Li
2018-05-30 19:47 ` [Patch v2 02/15] CIFS: Add support for direct pages in rdata Long Li
2018-05-30 20:27 ` Ruhl, Michael J
2018-05-30 20:57 ` Long Li [this message]
2018-06-24 1:50 ` Tom Talpey
2018-06-25 20:25 ` Long Li
2018-06-25 21:01 ` Jason Gunthorpe
2018-06-26 15:13 ` Tom Talpey
2018-06-27 3:21 ` Long Li
2018-05-30 19:47 ` [Patch v2 03/15] CIFS: Use offset when reading pages Long Li
2018-06-24 1:58 ` Tom Talpey
2018-06-25 20:27 ` Long Li
2018-05-30 19:47 ` [Patch v2 04/15] CIFS: Add support for direct pages in wdata Long Li
2018-06-24 2:01 ` Tom Talpey
2018-06-25 20:34 ` Long Li
2018-05-30 19:47 ` [Patch v2 05/15] CIFS: Calculate the correct request length based on page offset and tail size Long Li
2018-06-24 2:07 ` Tom Talpey
2018-06-25 21:07 ` Long Li
2018-05-30 19:47 ` [Patch v2 06/15] CIFS: Introduce helper function to get page offset and length in smb_rqst Long Li
2018-06-24 2:09 ` Tom Talpey
2018-06-25 21:14 ` Long Li
2018-06-26 13:16 ` Tom Talpey
2018-06-27 3:24 ` Long Li
2018-05-30 19:47 ` [Patch v2 07/15] CIFS: When sending data on socket, pass the correct page offset Long Li
2018-05-30 19:48 ` [Patch v2 08/15] CIFS: SMBD: Support page offset in RDMA send Long Li
2018-06-24 2:11 ` Tom Talpey
2018-06-25 21:23 ` Long Li
2018-05-30 19:48 ` [Patch v2 09/15] CIFS: SMBD: Support page offset in RDMA recv Long Li
2018-06-24 2:16 ` Tom Talpey
2018-06-25 21:29 ` Long Li
2018-05-30 19:48 ` [Patch v2 10/15] CIFS: SMBD: Support page offset in memory registration Long Li
2018-06-24 2:24 ` Tom Talpey
2018-05-30 19:48 ` [Patch v2 11/15] CIFS: Pass page offset for calculating signature Long Li
2018-06-24 2:27 ` Tom Talpey
2018-06-26 4:15 ` Long Li
2018-05-30 19:48 ` [Patch v2 12/15] CIFS: Pass page offset for encrypting Long Li
2018-06-24 2:28 ` Tom Talpey
2018-05-30 19:48 ` [Patch v2 13/15] CIFS: Add support for direct I/O read Long Li
2018-06-02 5:51 ` kbuild test robot
2018-06-02 7:15 ` kbuild test robot
2018-06-24 2:39 ` Tom Talpey
2018-06-26 4:34 ` Long Li
2018-05-30 19:48 ` [Patch v2 14/15] CIFS: Add support for direct I/O write Long Li
2018-06-24 2:48 ` Tom Talpey
2018-06-26 4:39 ` Long Li
2018-06-26 13:29 ` Tom Talpey
2018-06-27 3:44 ` Long Li
2018-05-30 19:48 ` [Patch v2 15/15] CIFS: Add direct I/O functions to file_operations Long Li
2018-06-07 11:17 ` Pavel Shilovsky
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