From: Tom Talpey <tom@talpey.com>
To: longli@microsoft.com, 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
Subject: Re: [Patch v2 02/15] CIFS: Add support for direct pages in rdata
Date: Sat, 23 Jun 2018 21:50:20 -0400 [thread overview]
Message-ID: <67b8afe7-f5e0-b36a-fcc1-87f1ae08eaa4@talpey.com> (raw)
In-Reply-To: <20180530194807.31657-3-longli@linuxonhyperv.com>
On 5/30/2018 3:47 PM, Long Li wrote:
> 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.
"Caller" is still responsible? Or is the rdata somehow freeing itself
via another mechanism?
>
> 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;
Technically speaking, these are syntactically equivalent. It may not
be worth changing this historic definition.
Tom.
> };
>
> 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);
> kfree(rdata);
> }
>
>
next prev parent reply other threads:[~2018-06-24 1:50 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
2018-06-24 1:50 ` Tom Talpey [this message]
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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