mirror of https://gitee.com/openkylin/linux.git
CIFS: Separate pages initialization from writepages
Reviewed-by: Shirish Pargaonkar <spargaonkar@suse.com> Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steve French <smfrench@gmail.com>
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@ -1878,6 +1878,40 @@ static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
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return rc;
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}
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static struct cifs_writedata *
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wdata_alloc_and_fillpages(pgoff_t tofind, struct address_space *mapping,
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pgoff_t end, pgoff_t *index,
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unsigned int *found_pages)
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{
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unsigned int nr_pages;
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struct page **pages;
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struct cifs_writedata *wdata;
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wdata = cifs_writedata_alloc((unsigned int)tofind,
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cifs_writev_complete);
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if (!wdata)
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return NULL;
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/*
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* find_get_pages_tag seems to return a max of 256 on each
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* iteration, so we must call it several times in order to
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* fill the array or the wsize is effectively limited to
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* 256 * PAGE_CACHE_SIZE.
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*/
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*found_pages = 0;
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pages = wdata->pages;
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do {
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nr_pages = find_get_pages_tag(mapping, index,
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PAGECACHE_TAG_DIRTY, tofind,
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pages);
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*found_pages += nr_pages;
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tofind -= nr_pages;
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pages += nr_pages;
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} while (nr_pages && tofind && *index <= end);
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return wdata;
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}
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static unsigned int
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wdata_prepare_pages(struct cifs_writedata *wdata, unsigned int found_pages,
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struct address_space *mapping,
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@ -2025,35 +2059,17 @@ static int cifs_writepages(struct address_space *mapping,
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while (!done && index <= end) {
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unsigned int i, nr_pages, found_pages;
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pgoff_t next = 0, tofind;
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struct page **pages;
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tofind = min((cifs_sb->wsize / PAGE_CACHE_SIZE) - 1,
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end - index) + 1;
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wdata = cifs_writedata_alloc((unsigned int)tofind,
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cifs_writev_complete);
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wdata = wdata_alloc_and_fillpages(tofind, mapping, end, &index,
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&found_pages);
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if (!wdata) {
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rc = -ENOMEM;
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break;
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}
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/*
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* find_get_pages_tag seems to return a max of 256 on each
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* iteration, so we must call it several times in order to
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* fill the array or the wsize is effectively limited to
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* 256 * PAGE_CACHE_SIZE.
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*/
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found_pages = 0;
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pages = wdata->pages;
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do {
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nr_pages = find_get_pages_tag(mapping, &index,
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PAGECACHE_TAG_DIRTY,
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tofind, pages);
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found_pages += nr_pages;
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tofind -= nr_pages;
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pages += nr_pages;
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} while (nr_pages && tofind && index <= end);
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if (found_pages == 0) {
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kref_put(&wdata->refcount, cifs_writedata_release);
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break;
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