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cifs: turn the pages list in cifs_readdata into an array
We'll need an array to put into a smb_rqst, so convert this into an array instead of (ab)using the lru list_head. Signed-off-by: Jeff Layton <jlayton@redhat.com>
This commit is contained in:
Jeff Layton
Steve French
parent
f4e49cd2dc
commit
c5fab6f4f0
@ -977,12 +977,13 @@ struct cifs_readdata {
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unsigned int bytes;
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pid_t pid;
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int result;
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struct list_head pages;
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struct work_struct work;
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int (*marshal_iov) (struct cifs_readdata *rdata,
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unsigned int remaining);
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unsigned int nr_iov;
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struct kvec *iov;
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unsigned int nr_pages;
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struct page *pages[];
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};
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struct cifs_writedata;
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@ -2419,13 +2419,13 @@ cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete)
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if (!iov)
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return (struct cifs_readdata *)iov;
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rdata = kzalloc(sizeof(*rdata), GFP_KERNEL);
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rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages),
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GFP_KERNEL);
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if (rdata != NULL) {
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kref_init(&rdata->refcount);
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INIT_LIST_HEAD(&rdata->list);
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init_completion(&rdata->done);
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INIT_WORK(&rdata->work, complete);
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INIT_LIST_HEAD(&rdata->pages);
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rdata->iov = iov;
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} else {
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kfree(iov);
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@ -2448,25 +2448,25 @@ cifs_readdata_release(struct kref *refcount)
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}
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static int
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cifs_read_allocate_pages(struct list_head *list, unsigned int npages)
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cifs_read_allocate_pages(struct cifs_readdata *rdata, unsigned int nr_pages)
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{
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int rc = 0;
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struct page *page, *tpage;
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struct page *page;
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unsigned int i;
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for (i = 0; i < npages; i++) {
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for (i = 0; i < nr_pages; i++) {
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page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
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if (!page) {
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rc = -ENOMEM;
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break;
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}
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list_add(&page->lru, list);
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rdata->pages[i] = page;
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}
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if (rc) {
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list_for_each_entry_safe(page, tpage, list, lru) {
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list_del(&page->lru);
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put_page(page);
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for (i = 0; i < nr_pages; i++) {
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put_page(rdata->pages[i]);
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rdata->pages[i] = NULL;
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}
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}
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return rc;
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@ -2475,13 +2475,13 @@ cifs_read_allocate_pages(struct list_head *list, unsigned int npages)
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static void
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cifs_uncached_readdata_release(struct kref *refcount)
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{
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struct page *page, *tpage;
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struct cifs_readdata *rdata = container_of(refcount,
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struct cifs_readdata, refcount);
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unsigned int i;
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list_for_each_entry_safe(page, tpage, &rdata->pages, lru) {
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list_del(&page->lru);
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put_page(page);
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for (i = 0; i < rdata->nr_pages; i++) {
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put_page(rdata->pages[i]);
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rdata->pages[i] = NULL;
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}
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cifs_readdata_release(refcount);
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}
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@ -2525,17 +2525,18 @@ cifs_readdata_to_iov(struct cifs_readdata *rdata, const struct iovec *iov,
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int rc = 0;
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struct iov_iter ii;
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size_t pos = rdata->offset - offset;
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struct page *page, *tpage;
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ssize_t remaining = rdata->bytes;
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unsigned char *pdata;
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unsigned int i;
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/* set up iov_iter and advance to the correct offset */
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iov_iter_init(&ii, iov, nr_segs, iov_length(iov, nr_segs), 0);
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iov_iter_advance(&ii, pos);
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*copied = 0;
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list_for_each_entry_safe(page, tpage, &rdata->pages, lru) {
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for (i = 0; i < rdata->nr_pages; i++) {
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ssize_t copy;
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struct page *page = rdata->pages[i];
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/* copy a whole page or whatever's left */
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copy = min_t(ssize_t, remaining, PAGE_SIZE);
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@ -2555,9 +2556,6 @@ cifs_readdata_to_iov(struct cifs_readdata *rdata, const struct iovec *iov,
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iov_iter_advance(&ii, copy);
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}
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}
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list_del(&page->lru);
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put_page(page);
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}
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return rc;
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@ -2568,13 +2566,12 @@ cifs_uncached_readv_complete(struct work_struct *work)
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{
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struct cifs_readdata *rdata = container_of(work,
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struct cifs_readdata, work);
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unsigned int i;
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/* if the result is non-zero then the pages weren't kmapped */
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if (rdata->result == 0) {
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struct page *page;
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list_for_each_entry(page, &rdata->pages, lru)
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kunmap(page);
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for (i = 0; i < rdata->nr_pages; i++)
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kunmap(rdata->pages[i]);
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}
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complete(&rdata->done);
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@ -2586,10 +2583,13 @@ cifs_uncached_read_marshal_iov(struct cifs_readdata *rdata,
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unsigned int remaining)
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{
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int len = 0;
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struct page *page, *tpage;
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unsigned int i;
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unsigned int nr_pages = rdata->nr_pages;
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rdata->nr_iov = 1;
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list_for_each_entry_safe(page, tpage, &rdata->pages, lru) {
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for (i = 0; i < nr_pages; i++) {
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struct page *page = rdata->pages[i];
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if (remaining >= PAGE_SIZE) {
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/* enough data to fill the page */
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rdata->iov[rdata->nr_iov].iov_base = kmap(page);
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@ -2616,7 +2616,8 @@ cifs_uncached_read_marshal_iov(struct cifs_readdata *rdata,
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remaining = 0;
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} else {
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/* no need to hold page hostage */
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list_del(&page->lru);
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rdata->pages[i] = NULL;
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rdata->nr_pages--;
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put_page(page);
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}
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}
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@ -2675,11 +2676,12 @@ cifs_iovec_read(struct file *file, const struct iovec *iov,
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goto error;
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}
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rc = cifs_read_allocate_pages(&rdata->pages, npages);
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rc = cifs_read_allocate_pages(rdata, npages);
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if (rc)
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goto error;
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rdata->cfile = cifsFileInfo_get(open_file);
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rdata->nr_pages = npages;
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rdata->offset = offset;
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rdata->bytes = cur_len;
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rdata->pid = pid;
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@ -2923,12 +2925,13 @@ int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
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static void
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cifs_readv_complete(struct work_struct *work)
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{
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unsigned int i;
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struct cifs_readdata *rdata = container_of(work,
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struct cifs_readdata, work);
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struct page *page, *tpage;
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list_for_each_entry_safe(page, tpage, &rdata->pages, lru) {
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list_del(&page->lru);
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for (i = 0; i < rdata->nr_pages; i++) {
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struct page *page = rdata->pages[i];
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lru_cache_add_file(page);
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if (rdata->result == 0) {
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@ -2943,6 +2946,7 @@ cifs_readv_complete(struct work_struct *work)
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cifs_readpage_to_fscache(rdata->mapping->host, page);
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page_cache_release(page);
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rdata->pages[i] = NULL;
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}
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kref_put(&rdata->refcount, cifs_readdata_release);
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}
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@ -2951,9 +2955,10 @@ static int
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cifs_readpages_marshal_iov(struct cifs_readdata *rdata, unsigned int remaining)
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{
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int len = 0;
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struct page *page, *tpage;
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unsigned int i;
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u64 eof;
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pgoff_t eof_index;
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unsigned int nr_pages = rdata->nr_pages;
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/* determine the eof that the server (probably) has */
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eof = CIFS_I(rdata->mapping->host)->server_eof;
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@ -2961,7 +2966,9 @@ cifs_readpages_marshal_iov(struct cifs_readdata *rdata, unsigned int remaining)
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cFYI(1, "eof=%llu eof_index=%lu", eof, eof_index);
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rdata->nr_iov = 1;
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list_for_each_entry_safe(page, tpage, &rdata->pages, lru) {
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for (i = 0; i < nr_pages; i++) {
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struct page *page = rdata->pages[i];
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if (remaining >= PAGE_CACHE_SIZE) {
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/* enough data to fill the page */
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rdata->iov[rdata->nr_iov].iov_base = kmap(page);
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@ -2996,18 +3003,20 @@ cifs_readpages_marshal_iov(struct cifs_readdata *rdata, unsigned int remaining)
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* fill them until the writes are flushed.
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*/
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zero_user(page, 0, PAGE_CACHE_SIZE);
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list_del(&page->lru);
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lru_cache_add_file(page);
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flush_dcache_page(page);
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SetPageUptodate(page);
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unlock_page(page);
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page_cache_release(page);
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rdata->pages[i] = NULL;
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rdata->nr_pages--;
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} else {
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/* no need to hold page hostage */
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list_del(&page->lru);
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lru_cache_add_file(page);
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unlock_page(page);
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page_cache_release(page);
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rdata->pages[i] = NULL;
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rdata->nr_pages--;
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}
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}
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@ -3065,6 +3074,7 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
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* the rdata->pages, then we want them in increasing order.
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*/
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while (!list_empty(page_list)) {
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unsigned int i;
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unsigned int bytes = PAGE_CACHE_SIZE;
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unsigned int expected_index;
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unsigned int nr_pages = 1;
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@ -3135,13 +3145,16 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
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rdata->bytes = bytes;
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rdata->pid = pid;
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rdata->marshal_iov = cifs_readpages_marshal_iov;
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list_splice_init(&tmplist, &rdata->pages);
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list_for_each_entry_safe(page, tpage, &tmplist, lru) {
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list_del(&page->lru);
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rdata->pages[rdata->nr_pages++] = page;
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}
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rc = cifs_retry_async_readv(rdata);
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if (rc != 0) {
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list_for_each_entry_safe(page, tpage, &rdata->pages,
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lru) {
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list_del(&page->lru);
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for (i = 0; i < rdata->nr_pages; i++) {
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page = rdata->pages[i];
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lru_cache_add_file(page);
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unlock_page(page);
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page_cache_release(page);
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