From: Long Li <longli@microsoft.com>
To: Tom Talpey <tom@talpey.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 06/15] CIFS: Introduce helper function to get page offset and length in smb_rqst
Date: Mon, 25 Jun 2018 21:14:31 +0000 [thread overview]
Message-ID: <CY4PR2101MB0722840106EDFEFBBA42D45FCE4A0@CY4PR2101MB0722.namprd21.prod.outlook.com> (raw)
In-Reply-To: <a6613388-0dc5-7646-b71f-75b8bec4e4d9@talpey.com>
> Subject: Re: [Patch v2 06/15] CIFS: Introduce helper function to get page
> offset and length in smb_rqst
>
> On 5/30/2018 3:47 PM, Long Li wrote:
> > From: Long Li <longli@microsoft.com>
> >
> > Introduce a function rqst_page_get_length to return the page offset
> > and length for a given page in smb_rqst. This function is to be used
> > by following patches.
> >
> > Signed-off-by: Long Li <longli@microsoft.com>
> > ---
> > fs/cifs/cifsproto.h | 3 +++
> > fs/cifs/misc.c | 17 +++++++++++++++++
> > 2 files changed, 20 insertions(+)
> >
> > diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h index
> > 7933c5f..89dda14 100644
> > --- a/fs/cifs/cifsproto.h
> > +++ b/fs/cifs/cifsproto.h
> > @@ -557,4 +557,7 @@ int cifs_alloc_hash(const char *name, struct
> crypto_shash **shash,
> > struct sdesc **sdesc);
> > void cifs_free_hash(struct crypto_shash **shash, struct sdesc
> > **sdesc);
> >
> > +extern void rqst_page_get_length(struct smb_rqst *rqst, unsigned int
> page,
> > + unsigned int *len, unsigned int *offset);
> > +
> > #endif /* _CIFSPROTO_H */
> > diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c index 96849b5..e951417
> > 100644
> > --- a/fs/cifs/misc.c
> > +++ b/fs/cifs/misc.c
> > @@ -905,3 +905,20 @@ cifs_free_hash(struct crypto_shash **shash,
> struct sdesc **sdesc)
> > crypto_free_shash(*shash);
> > *shash = NULL;
> > }
> > +
> > +/**
> > + * rqst_page_get_length - obtain the length and offset for a page in
> > +smb_rqst
> > + * Input: rqst - a smb_rqst, page - a page index for rqst
> > + * Output: *len - the length for this page, *offset - the offset for
> > +this page */ void rqst_page_get_length(struct smb_rqst *rqst,
> > +unsigned int page,
> > + unsigned int *len, unsigned int *offset) {
> > + *len = rqst->rq_pagesz;
> > + *offset = (page == 0) ? rqst->rq_offset : 0;
>
> Really? Page 0 always has a zero offset??
I think you are misreading this line. The offset for page 0 is rq_offset, the offset for all subsequent pages are 0.
>
> > +
> > + if (rqst->rq_npages == 1 || page == rqst->rq_npages-1)
> > + *len = rqst->rq_tailsz;
> > + else if (page == 0)
> > + *len = rqst->rq_pagesz - rqst->rq_offset; }
> >
>
> This subroutine does what patch 5 does inline. Why not push this patch up in
> the sequence and use the helper?
This is actually a little different. This function returns the length and offset for a given page in the request. There might be multiple pages in a request.
The other function calculates the total length of all the pages in a request.
>
> Tom.
next prev parent reply other threads:[~2018-06-25 21:14 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
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 [this message]
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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