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Commit eddb079d authored by Jeff Layton's avatar Jeff Layton Committed by Steve French
Browse files

cifs: convert async write code to pass in data via rq_pages array 



Reviewed-by: default avatarPavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: default avatarJeff Layton <jlayton@redhat.com>
Signed-off-by: default avatarSteve French <smfrench@gmail.com>
parent fec344e3

fs/cifs/cifsglob.h

+2 −2
Original line number Diff line number Diff line
@@ -999,8 +999,8 @@ struct cifs_writedata { 
	pid_t				pid;

	unsigned int			bytes;

	int				result;

	void (*marshal_iov) (struct kvec *iov,

			     struct cifs_writedata *wdata);

	unsigned int			pagesz;

	unsigned int			tailsz;

	unsigned int			nr_pages;

	struct page			*pages[1];

};

fs/cifs/cifssmb.c

+11 −28
Original line number Diff line number Diff line
@@ -2033,11 +2033,11 @@ cifs_writev_callback(struct mid_q_entry *mid) 
int

cifs_async_writev(struct cifs_writedata *wdata)

{

	int i, rc = -EACCES;

	int rc = -EACCES;

	WRITE_REQ *smb = NULL;

	int wct;

	struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);

	struct kvec *iov = NULL;

	struct kvec iov;

	struct smb_rqst rqst = { };



	if (tcon->ses->capabilities & CAP_LARGE_FILES) {
@@ -2054,15 +2054,6 @@ cifs_async_writev(struct cifs_writedata *wdata) 
	if (rc)

		goto async_writev_out;



	/* 1 iov per page + 1 for header */

	rqst.rq_nvec = wdata->nr_pages + 1;

	iov = kzalloc((rqst.rq_nvec) * sizeof(*iov), GFP_NOFS);

	if (iov == NULL) {

		rc = -ENOMEM;

		goto async_writev_out;

	}

	rqst.rq_iov = iov;



	smb->hdr.Pid = cpu_to_le16((__u16)wdata->pid);

	smb->hdr.PidHigh = cpu_to_le16((__u16)(wdata->pid >> 16));
@@ -2079,18 +2070,15 @@ cifs_async_writev(struct cifs_writedata *wdata) 
	    cpu_to_le16(offsetof(struct smb_com_write_req, Data) - 4);



	/* 4 for RFC1001 length + 1 for BCC */

	iov[0].iov_len = be32_to_cpu(smb->hdr.smb_buf_length) + 4 + 1;

	iov[0].iov_base = smb;

	iov.iov_len = be32_to_cpu(smb->hdr.smb_buf_length) + 4 + 1;

	iov.iov_base = smb;



	/*

	 * This function should marshal up the page array into the kvec

	 * array, reserving [0] for the header. It should kmap the pages

	 * and set the iov_len properly for each one. It may also set

	 * wdata->bytes too.

	 */

	cifs_kmap_lock();

	wdata->marshal_iov(iov, wdata);

	cifs_kmap_unlock();

	rqst.rq_iov = &iov;

	rqst.rq_nvec = 1;

	rqst.rq_pages = wdata->pages;

	rqst.rq_npages = wdata->nr_pages;

	rqst.rq_pagesz = wdata->pagesz;

	rqst.rq_tailsz = wdata->tailsz;



	cFYI(1, "async write at %llu %u bytes", wdata->offset, wdata->bytes);
@@ -2106,7 +2094,7 @@ cifs_async_writev(struct cifs_writedata *wdata) 
				(struct smb_com_writex_req *)smb;

		inc_rfc1001_len(&smbw->hdr, wdata->bytes + 5);

		put_bcc(wdata->bytes + 5, &smbw->hdr);

		iov[0].iov_len += 4; /* pad bigger by four bytes */

		iov.iov_len += 4; /* pad bigger by four bytes */

	}



	kref_get(&wdata->refcount);
@@ -2118,13 +2106,8 @@ cifs_async_writev(struct cifs_writedata *wdata) 
	else

		kref_put(&wdata->refcount, cifs_writedata_release);



	/* send is done, unmap pages */

	for (i = 0; i < wdata->nr_pages; i++)

		kunmap(wdata->pages[i]);



async_writev_out:

	cifs_small_buf_release(smb);

	kfree(iov);

	return rc;

}

fs/cifs/file.c

+10 −38
Original line number Diff line number Diff line
@@ -1738,27 +1738,6 @@ static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) 
	return rc;

}



/*

 * Marshal up the iov array, reserving the first one for the header. Also,

 * set wdata->bytes.

 */

static void

cifs_writepages_marshal_iov(struct kvec *iov, struct cifs_writedata *wdata)

{

	int i;

	struct inode *inode = wdata->cfile->dentry->d_inode;

	loff_t size = i_size_read(inode);



	/* marshal up the pages into iov array */

	wdata->bytes = 0;

	for (i = 0; i < wdata->nr_pages; i++) {

		iov[i + 1].iov_len = min(size - page_offset(wdata->pages[i]),

					(loff_t)PAGE_CACHE_SIZE);

		iov[i + 1].iov_base = kmap(wdata->pages[i]);

		wdata->bytes += iov[i + 1].iov_len;

	}

}



static int cifs_writepages(struct address_space *mapping,

			   struct writeback_control *wbc)

{
@@ -1769,6 +1748,7 @@ static int cifs_writepages(struct address_space *mapping, 
	struct TCP_Server_Info *server;

	struct page *page;

	int rc = 0;

	loff_t isize = i_size_read(mapping->host);



	/*

	 * If wsize is smaller than the page cache size, default to writing
@@ -1873,7 +1853,7 @@ static int cifs_writepages(struct address_space *mapping, 
			 */

			set_page_writeback(page);



			if (page_offset(page) >= mapping->host->i_size) {

			if (page_offset(page) >= isize) {

				done = true;

				unlock_page(page);

				end_page_writeback(page);
@@ -1904,7 +1884,12 @@ static int cifs_writepages(struct address_space *mapping, 
		wdata->sync_mode = wbc->sync_mode;

		wdata->nr_pages = nr_pages;

		wdata->offset = page_offset(wdata->pages[0]);

		wdata->marshal_iov = cifs_writepages_marshal_iov;

		wdata->pagesz = PAGE_CACHE_SIZE;

		wdata->tailsz =

			min(isize - page_offset(wdata->pages[nr_pages - 1]),

			    (loff_t)PAGE_CACHE_SIZE);

		wdata->bytes = ((nr_pages - 1) * PAGE_CACHE_SIZE) +

					wdata->tailsz;



		do {

			if (wdata->cfile != NULL)
@@ -2205,20 +2190,6 @@ size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) 
	return num_pages;

}



static void

cifs_uncached_marshal_iov(struct kvec *iov, struct cifs_writedata *wdata)

{

	int i;

	size_t bytes = wdata->bytes;



	/* marshal up the pages into iov array */

	for (i = 0; i < wdata->nr_pages; i++) {

		iov[i + 1].iov_len = min_t(size_t, bytes, PAGE_SIZE);

		iov[i + 1].iov_base = kmap(wdata->pages[i]);

		bytes -= iov[i + 1].iov_len;

	}

}



static void

cifs_uncached_writev_complete(struct work_struct *work)

{
@@ -2339,7 +2310,8 @@ cifs_iovec_write(struct file *file, const struct iovec *iov, 
		wdata->cfile = cifsFileInfo_get(open_file);

		wdata->pid = pid;

		wdata->bytes = cur_len;

		wdata->marshal_iov = cifs_uncached_marshal_iov;

		wdata->pagesz = PAGE_SIZE;

		wdata->tailsz = cur_len - ((nr_pages - 1) * PAGE_SIZE);

		rc = cifs_uncached_retry_writev(wdata);

		if (rc) {

			kref_put(&wdata->refcount, cifs_writedata_release);

fs/cifs/smb2pdu.c

+10 −27
Original line number Diff line number Diff line
@@ -1484,25 +1484,16 @@ smb2_writev_callback(struct mid_q_entry *mid) 
int

smb2_async_writev(struct cifs_writedata *wdata)

{

	int i, rc = -EACCES;

	int rc = -EACCES;

	struct smb2_write_req *req = NULL;

	struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);

	struct kvec *iov = NULL;

	struct kvec iov;

	struct smb_rqst rqst;



	rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);

	if (rc)

		goto async_writev_out;



	/* 1 iov per page + 1 for header */

	iov = kzalloc((wdata->nr_pages + 1) * sizeof(*iov), GFP_NOFS);

	if (iov == NULL) {

		rc = -ENOMEM;

		goto async_writev_out;

	}

	rqst.rq_iov = iov;

	rqst.rq_nvec = wdata->nr_pages + 1;



	req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);



	req->PersistentFileId = wdata->cfile->fid.persistent_fid;
@@ -1517,18 +1508,15 @@ smb2_async_writev(struct cifs_writedata *wdata) 
	req->RemainingBytes = 0;



	/* 4 for rfc1002 length field and 1 for Buffer */

	iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;

	iov[0].iov_base = (char *)req;

	iov.iov_len = get_rfc1002_length(req) + 4 - 1;

	iov.iov_base = req;



	/*

	 * This function should marshal up the page array into the kvec

	 * array, reserving [0] for the header. It should kmap the pages

	 * and set the iov_len properly for each one. It may also set

	 * wdata->bytes too.

	 */

	cifs_kmap_lock();

	wdata->marshal_iov(iov, wdata);

	cifs_kmap_unlock();

	rqst.rq_iov = &iov;

	rqst.rq_nvec = 1;

	rqst.rq_pages = wdata->pages;

	rqst.rq_npages = wdata->nr_pages;

	rqst.rq_pagesz = wdata->pagesz;

	rqst.rq_tailsz = wdata->tailsz;



	cFYI(1, "async write at %llu %u bytes", wdata->offset, wdata->bytes);
@@ -1543,13 +1531,8 @@ smb2_async_writev(struct cifs_writedata *wdata) 
	if (rc)

		kref_put(&wdata->refcount, cifs_writedata_release);



	/* send is done, unmap pages */

	for (i = 0; i < wdata->nr_pages; i++)

		kunmap(wdata->pages[i]);



async_writev_out:

	cifs_small_buf_release(req);

	kfree(iov);

	return rc;

}