2012/7/18 Jeff Layton <jlayton@xxxxxxxxxx>:
> Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
> ---
> fs/cifs/cifsproto.h | 4 ++--
> fs/cifs/cifssmb.c | 33 ++++++++++-----------------------
> fs/cifs/file.c | 47 +++++++++--------------------------------------
> 3 files changed, 21 insertions(+), 63 deletions(-)
>
> diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
> index dbb9c61..64a4297 100644
> --- a/fs/cifs/cifsproto.h
> +++ b/fs/cifs/cifsproto.h
> @@ -515,8 +515,8 @@ 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];
> };
> diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
> index 727f35e..cb7de86 100644
> --- a/fs/cifs/cifssmb.c
> +++ b/fs/cifs/cifssmb.c
> @@ -2052,7 +2052,7 @@ cifs_async_writev(struct cifs_writedata *wdata)
> 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) {
> @@ -2069,15 +2069,6 @@ 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));
>
> @@ -2094,18 +2085,15 @@ 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;
Now we are not kmapping here but still kunmaping below:
2105 >-------/* send is done, unmap pages */
2106 >-------for (i = 0; i < wdata->nr_pages; i++)
2107 >------->-------kunmap(wdata->pages[i]);
Is it ok? (seems like we've already kunmap'ed them in smb_send_rqst)
>
> cFYI(1, "async write at %llu %u bytes", wdata->offset, wdata->bytes);
>
> @@ -2121,7 +2109,7 @@ 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);
> @@ -2139,7 +2127,6 @@ cifs_async_writev(struct cifs_writedata *wdata)
>
> async_writev_out:
> cifs_small_buf_release(smb);
> - kfree(iov);
> return rc;
> }
>
> diff --git a/fs/cifs/file.c b/fs/cifs/file.c
> index dd28caa..d5f8c60 100644
> --- a/fs/cifs/file.c
> +++ b/fs/cifs/file.c
> @@ -1710,27 +1710,6 @@ 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)
> {
> @@ -1740,6 +1719,7 @@ static int cifs_writepages(struct address_space *mapping,
> struct cifs_writedata *wdata;
> 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
> @@ -1844,7 +1824,7 @@ retry:
> */
> 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);
> @@ -1875,7 +1855,11 @@ retry:
> 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)
> @@ -2164,20 +2148,6 @@ size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len)
> }
>
> 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)
> {
> int i;
> @@ -2290,7 +2260,8 @@ 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);
> --
> 1.7.10.4
>
> --
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--
Best regards,
Pavel Shilovsky.
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