*
*/
#include <linux/fs.h>
+#include <linux/filelock.h>
#include <linux/backing-dev.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
#include "cifs_ioctl.h"
#include "cached_dir.h"
+/*
+ * Remove the dirty flags from a span of pages.
+ */
+static void cifs_undirty_folios(struct inode *inode, loff_t start, unsigned int len)
+{
+ struct address_space *mapping = inode->i_mapping;
+ struct folio *folio;
+ pgoff_t end;
+
+ XA_STATE(xas, &mapping->i_pages, start / PAGE_SIZE);
+
+ rcu_read_lock();
+
+ end = (start + len - 1) / PAGE_SIZE;
+ xas_for_each_marked(&xas, folio, end, PAGECACHE_TAG_DIRTY) {
+ xas_pause(&xas);
+ rcu_read_unlock();
+ folio_lock(folio);
+ folio_clear_dirty_for_io(folio);
+ folio_unlock(folio);
+ rcu_read_lock();
+ }
+
+ rcu_read_unlock();
+}
+
+/*
+ * Completion of write to server.
+ */
+void cifs_pages_written_back(struct inode *inode, loff_t start, unsigned int len)
+{
+ struct address_space *mapping = inode->i_mapping;
+ struct folio *folio;
+ pgoff_t end;
+
+ XA_STATE(xas, &mapping->i_pages, start / PAGE_SIZE);
+
+ if (!len)
+ return;
+
+ rcu_read_lock();
+
+ end = (start + len - 1) / PAGE_SIZE;
+ xas_for_each(&xas, folio, end) {
+ if (!folio_test_writeback(folio)) {
+ WARN_ONCE(1, "bad %x @%llx page %lx %lx\n",
+ len, start, folio_index(folio), end);
+ continue;
+ }
+
+ folio_detach_private(folio);
+ folio_end_writeback(folio);
+ }
+
+ rcu_read_unlock();
+}
+
+/*
+ * Failure of write to server.
+ */
+void cifs_pages_write_failed(struct inode *inode, loff_t start, unsigned int len)
+{
+ struct address_space *mapping = inode->i_mapping;
+ struct folio *folio;
+ pgoff_t end;
+
+ XA_STATE(xas, &mapping->i_pages, start / PAGE_SIZE);
+
+ if (!len)
+ return;
+
+ rcu_read_lock();
+
+ end = (start + len - 1) / PAGE_SIZE;
+ xas_for_each(&xas, folio, end) {
+ if (!folio_test_writeback(folio)) {
+ WARN_ONCE(1, "bad %x @%llx page %lx %lx\n",
+ len, start, folio_index(folio), end);
+ continue;
+ }
+
+ folio_set_error(folio);
+ folio_end_writeback(folio);
+ }
+
+ rcu_read_unlock();
+}
+
+/*
+ * Redirty pages after a temporary failure.
+ */
+void cifs_pages_write_redirty(struct inode *inode, loff_t start, unsigned int len)
+{
+ struct address_space *mapping = inode->i_mapping;
+ struct folio *folio;
+ pgoff_t end;
+
+ XA_STATE(xas, &mapping->i_pages, start / PAGE_SIZE);
+
+ if (!len)
+ return;
+
+ rcu_read_lock();
+
+ end = (start + len - 1) / PAGE_SIZE;
+ xas_for_each(&xas, folio, end) {
+ if (!folio_test_writeback(folio)) {
+ WARN_ONCE(1, "bad %x @%llx page %lx %lx\n",
+ len, start, folio_index(folio), end);
+ continue;
+ }
+
+ filemap_dirty_folio(folio->mapping, folio);
+ folio_end_writeback(folio);
+ }
+
+ rcu_read_unlock();
+}
+
/*
* Mark as invalid, all open files on tree connections since they
* were closed when session to server was lost.
if (f_flags & O_DIRECT)
create_options |= CREATE_NO_BUFFER;
- oparms.tcon = tcon;
- oparms.cifs_sb = cifs_sb;
- oparms.desired_access = desired_access;
- oparms.create_options = cifs_create_options(cifs_sb, create_options);
- oparms.disposition = disposition;
- oparms.path = full_path;
- oparms.fid = fid;
- oparms.reconnect = false;
+ oparms = (struct cifs_open_parms) {
+ .tcon = tcon,
+ .cifs_sb = cifs_sb,
+ .desired_access = desired_access,
+ .create_options = cifs_create_options(cifs_sb, create_options),
+ .disposition = disposition,
+ .path = full_path,
+ .fid = fid,
+ };
rc = server->ops->open(xid, &oparms, oplock, buf);
if (rc)
if (server->ops->get_lease_key)
server->ops->get_lease_key(inode, &cfile->fid);
- oparms.tcon = tcon;
- oparms.cifs_sb = cifs_sb;
- oparms.desired_access = desired_access;
- oparms.create_options = cifs_create_options(cifs_sb, create_options);
- oparms.disposition = disposition;
- oparms.path = full_path;
- oparms.fid = &cfile->fid;
- oparms.reconnect = true;
+ oparms = (struct cifs_open_parms) {
+ .tcon = tcon,
+ .cifs_sb = cifs_sb,
+ .desired_access = desired_access,
+ .create_options = cifs_create_options(cifs_sb, create_options),
+ .disposition = disposition,
+ .path = full_path,
+ .fid = &cfile->fid,
+ .reconnect = true,
+ };
/*
* Can not refresh inode by passing in file_info buf to be returned by
if (wdata->cfile)
cifsFileInfo_put(wdata->cfile);
- kvfree(wdata->pages);
kfree(wdata);
}
static void
cifs_writev_requeue(struct cifs_writedata *wdata)
{
- int i, rc = 0;
+ int rc = 0;
struct inode *inode = d_inode(wdata->cfile->dentry);
struct TCP_Server_Info *server;
- unsigned int rest_len;
+ unsigned int rest_len = wdata->bytes;
+ loff_t fpos = wdata->offset;
server = tlink_tcon(wdata->cfile->tlink)->ses->server;
- i = 0;
- rest_len = wdata->bytes;
do {
struct cifs_writedata *wdata2;
- unsigned int j, nr_pages, wsize, tailsz, cur_len;
+ unsigned int wsize, cur_len;
wsize = server->ops->wp_retry_size(inode);
if (wsize < rest_len) {
- nr_pages = wsize / PAGE_SIZE;
- if (!nr_pages) {
+ if (wsize < PAGE_SIZE) {
rc = -EOPNOTSUPP;
break;
}
- cur_len = nr_pages * PAGE_SIZE;
- tailsz = PAGE_SIZE;
+ cur_len = min(round_down(wsize, PAGE_SIZE), rest_len);
} else {
- nr_pages = DIV_ROUND_UP(rest_len, PAGE_SIZE);
cur_len = rest_len;
- tailsz = rest_len - (nr_pages - 1) * PAGE_SIZE;
}
- wdata2 = cifs_writedata_alloc(nr_pages, cifs_writev_complete);
+ wdata2 = cifs_writedata_alloc(cifs_writev_complete);
if (!wdata2) {
rc = -ENOMEM;
break;
}
- for (j = 0; j < nr_pages; j++) {
- wdata2->pages[j] = wdata->pages[i + j];
- lock_page(wdata2->pages[j]);
- clear_page_dirty_for_io(wdata2->pages[j]);
- }
-
wdata2->sync_mode = wdata->sync_mode;
- wdata2->nr_pages = nr_pages;
- wdata2->offset = page_offset(wdata2->pages[0]);
- wdata2->pagesz = PAGE_SIZE;
- wdata2->tailsz = tailsz;
- wdata2->bytes = cur_len;
+ wdata2->offset = fpos;
+ wdata2->bytes = cur_len;
+ wdata2->iter = wdata->iter;
+
+ iov_iter_advance(&wdata2->iter, fpos - wdata->offset);
+ iov_iter_truncate(&wdata2->iter, wdata2->bytes);
+
+ if (iov_iter_is_xarray(&wdata2->iter))
+ /* Check for pages having been redirtied and clean
+ * them. We can do this by walking the xarray. If
+ * it's not an xarray, then it's a DIO and we shouldn't
+ * be mucking around with the page bits.
+ */
+ cifs_undirty_folios(inode, fpos, cur_len);
rc = cifs_get_writable_file(CIFS_I(inode), FIND_WR_ANY,
&wdata2->cfile);
cifs_writedata_release);
}
- for (j = 0; j < nr_pages; j++) {
- unlock_page(wdata2->pages[j]);
- if (rc != 0 && !is_retryable_error(rc)) {
- SetPageError(wdata2->pages[j]);
- end_page_writeback(wdata2->pages[j]);
- put_page(wdata2->pages[j]);
- }
- }
-
kref_put(&wdata2->refcount, cifs_writedata_release);
if (rc) {
if (is_retryable_error(rc))
continue;
- i += nr_pages;
+ fpos += cur_len;
+ rest_len -= cur_len;
break;
}
+ fpos += cur_len;
rest_len -= cur_len;
- i += nr_pages;
- } while (i < wdata->nr_pages);
+ } while (rest_len > 0);
- /* cleanup remaining pages from the original wdata */
- for (; i < wdata->nr_pages; i++) {
- SetPageError(wdata->pages[i]);
- end_page_writeback(wdata->pages[i]);
- put_page(wdata->pages[i]);
- }
+ /* Clean up remaining pages from the original wdata */
+ if (iov_iter_is_xarray(&wdata->iter))
+ cifs_pages_write_failed(inode, fpos, rest_len);
if (rc != 0 && !is_retryable_error(rc))
mapping_set_error(inode->i_mapping, rc);
struct cifs_writedata *wdata = container_of(work,
struct cifs_writedata, work);
struct inode *inode = d_inode(wdata->cfile->dentry);
- int i = 0;
if (wdata->result == 0) {
spin_lock(&inode->i_lock);
} else if (wdata->sync_mode == WB_SYNC_ALL && wdata->result == -EAGAIN)
return cifs_writev_requeue(wdata);
- for (i = 0; i < wdata->nr_pages; i++) {
- struct page *page = wdata->pages[i];
+ if (wdata->result == -EAGAIN)
+ cifs_pages_write_redirty(inode, wdata->offset, wdata->bytes);
+ else if (wdata->result < 0)
+ cifs_pages_write_failed(inode, wdata->offset, wdata->bytes);
+ else
+ cifs_pages_written_back(inode, wdata->offset, wdata->bytes);
- if (wdata->result == -EAGAIN)
- __set_page_dirty_nobuffers(page);
- else if (wdata->result < 0)
- SetPageError(page);
- end_page_writeback(page);
- cifs_readpage_to_fscache(inode, page);
- put_page(page);
- }
if (wdata->result != -EAGAIN)
mapping_set_error(inode->i_mapping, wdata->result);
kref_put(&wdata->refcount, cifs_writedata_release);
}
-struct cifs_writedata *
-cifs_writedata_alloc(unsigned int nr_pages, work_func_t complete)
-{
- struct cifs_writedata *writedata = NULL;
- struct page **pages =
- kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS);
- if (pages) {
- writedata = cifs_writedata_direct_alloc(pages, complete);
- if (!writedata)
- kvfree(pages);
- }
-
- return writedata;
-}
-
-struct cifs_writedata *
-cifs_writedata_direct_alloc(struct page **pages, work_func_t complete)
+struct cifs_writedata *cifs_writedata_alloc(work_func_t complete)
{
struct cifs_writedata *wdata;
wdata = kzalloc(sizeof(*wdata), GFP_NOFS);
if (wdata != NULL) {
- wdata->pages = pages;
kref_init(&wdata->refcount);
INIT_LIST_HEAD(&wdata->list);
init_completion(&wdata->done);
return wdata;
}
-
static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
{
struct address_space *mapping = page->mapping;
return rc;
}
-static struct cifs_writedata *
-wdata_alloc_and_fillpages(pgoff_t tofind, struct address_space *mapping,
- pgoff_t end, pgoff_t *index,
- unsigned int *found_pages)
+/*
+ * Extend the region to be written back to include subsequent contiguously
+ * dirty pages if possible, but don't sleep while doing so.
+ */
+static void cifs_extend_writeback(struct address_space *mapping,
+ long *_count,
+ loff_t start,
+ int max_pages,
+ size_t max_len,
+ unsigned int *_len)
{
- struct cifs_writedata *wdata;
- struct folio_batch fbatch;
- unsigned int i, idx, p, nr;
- wdata = cifs_writedata_alloc((unsigned int)tofind,
- cifs_writev_complete);
- if (!wdata)
- return NULL;
-
- folio_batch_init(&fbatch);
- *found_pages = 0;
-
-again:
- nr = filemap_get_folios_tag(mapping, index, end,
- PAGECACHE_TAG_DIRTY, &fbatch);
- if (!nr)
- goto out; /* No dirty pages left in the range */
-
- for (i = 0; i < nr; i++) {
- struct folio *folio = fbatch.folios[i];
-
- idx = 0;
- p = folio_nr_pages(folio);
-add_more:
- wdata->pages[*found_pages] = folio_page(folio, idx);
- folio_get(folio);
- if (++*found_pages == tofind) {
- folio_batch_release(&fbatch);
- goto out;
- }
- if (++idx < p)
- goto add_more;
- }
- folio_batch_release(&fbatch);
- goto again;
-out:
- return wdata;
-}
+ struct folio_batch batch;
+ struct folio *folio;
+ unsigned int psize, nr_pages;
+ size_t len = *_len;
+ pgoff_t index = (start + len) / PAGE_SIZE;
+ bool stop = true;
+ unsigned int i;
+ XA_STATE(xas, &mapping->i_pages, index);
-static unsigned int
-wdata_prepare_pages(struct cifs_writedata *wdata, unsigned int found_pages,
- struct address_space *mapping,
- struct writeback_control *wbc,
- pgoff_t end, pgoff_t *index, pgoff_t *next, bool *done)
-{
- unsigned int nr_pages = 0, i;
- struct page *page;
+ folio_batch_init(&batch);
- for (i = 0; i < found_pages; i++) {
- page = wdata->pages[i];
- /*
- * At this point we hold neither the i_pages lock nor the
- * page lock: the page may be truncated or invalidated
- * (changing page->mapping to NULL), or even swizzled
- * back from swapper_space to tmpfs file mapping
+ do {
+ /* Firstly, we gather up a batch of contiguous dirty pages
+ * under the RCU read lock - but we can't clear the dirty flags
+ * there if any of those pages are mapped.
*/
+ rcu_read_lock();
- if (nr_pages == 0)
- lock_page(page);
- else if (!trylock_page(page))
- break;
-
- if (unlikely(page->mapping != mapping)) {
- unlock_page(page);
- break;
- }
+ xas_for_each(&xas, folio, ULONG_MAX) {
+ stop = true;
+ if (xas_retry(&xas, folio))
+ continue;
+ if (xa_is_value(folio))
+ break;
+ if (folio_index(folio) != index)
+ break;
+ if (!folio_try_get_rcu(folio)) {
+ xas_reset(&xas);
+ continue;
+ }
+ nr_pages = folio_nr_pages(folio);
+ if (nr_pages > max_pages)
+ break;
- if (!wbc->range_cyclic && page->index > end) {
- *done = true;
- unlock_page(page);
- break;
- }
+ /* Has the page moved or been split? */
+ if (unlikely(folio != xas_reload(&xas))) {
+ folio_put(folio);
+ break;
+ }
- if (*next && (page->index != *next)) {
- /* Not next consecutive page */
- unlock_page(page);
- break;
- }
+ if (!folio_trylock(folio)) {
+ folio_put(folio);
+ break;
+ }
+ if (!folio_test_dirty(folio) || folio_test_writeback(folio)) {
+ folio_unlock(folio);
+ folio_put(folio);
+ break;
+ }
- if (wbc->sync_mode != WB_SYNC_NONE)
- wait_on_page_writeback(page);
+ max_pages -= nr_pages;
+ psize = folio_size(folio);
+ len += psize;
+ stop = false;
+ if (max_pages <= 0 || len >= max_len || *_count <= 0)
+ stop = true;
- if (PageWriteback(page) ||
- !clear_page_dirty_for_io(page)) {
- unlock_page(page);
- break;
+ index += nr_pages;
+ if (!folio_batch_add(&batch, folio))
+ break;
+ if (stop)
+ break;
}
- /*
- * This actually clears the dirty bit in the radix tree.
- * See cifs_writepage() for more commentary.
+ if (!stop)
+ xas_pause(&xas);
+ rcu_read_unlock();
+
+ /* Now, if we obtained any pages, we can shift them to being
+ * writable and mark them for caching.
*/
- set_page_writeback(page);
- if (page_offset(page) >= i_size_read(mapping->host)) {
- *done = true;
- unlock_page(page);
- end_page_writeback(page);
+ if (!folio_batch_count(&batch))
break;
- }
- wdata->pages[i] = page;
- *next = page->index + 1;
- ++nr_pages;
- }
+ for (i = 0; i < folio_batch_count(&batch); i++) {
+ folio = batch.folios[i];
+ /* The folio should be locked, dirty and not undergoing
+ * writeback from the loop above.
+ */
+ if (!folio_clear_dirty_for_io(folio))
+ WARN_ON(1);
+ if (folio_start_writeback(folio))
+ WARN_ON(1);
- /* reset index to refind any pages skipped */
- if (nr_pages == 0)
- *index = wdata->pages[0]->index + 1;
+ *_count -= folio_nr_pages(folio);
+ folio_unlock(folio);
+ }
- /* put any pages we aren't going to use */
- for (i = nr_pages; i < found_pages; i++) {
- put_page(wdata->pages[i]);
- wdata->pages[i] = NULL;
- }
+ folio_batch_release(&batch);
+ cond_resched();
+ } while (!stop);
- return nr_pages;
+ *_len = len;
}
-static int
-wdata_send_pages(struct cifs_writedata *wdata, unsigned int nr_pages,
- struct address_space *mapping, struct writeback_control *wbc)
+/*
+ * Write back the locked page and any subsequent non-locked dirty pages.
+ */
+static ssize_t cifs_write_back_from_locked_folio(struct address_space *mapping,
+ struct writeback_control *wbc,
+ struct folio *folio,
+ loff_t start, loff_t end)
{
+ struct inode *inode = mapping->host;
+ struct TCP_Server_Info *server;
+ struct cifs_writedata *wdata;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+ struct cifs_credits credits_on_stack;
+ struct cifs_credits *credits = &credits_on_stack;
+ struct cifsFileInfo *cfile = NULL;
+ unsigned int xid, wsize, len;
+ loff_t i_size = i_size_read(inode);
+ size_t max_len;
+ long count = wbc->nr_to_write;
int rc;
- wdata->sync_mode = wbc->sync_mode;
- wdata->nr_pages = nr_pages;
- wdata->offset = page_offset(wdata->pages[0]);
- wdata->pagesz = PAGE_SIZE;
- wdata->tailsz = min(i_size_read(mapping->host) -
- page_offset(wdata->pages[nr_pages - 1]),
- (loff_t)PAGE_SIZE);
- wdata->bytes = ((nr_pages - 1) * PAGE_SIZE) + wdata->tailsz;
- wdata->pid = wdata->cfile->pid;
-
- rc = adjust_credits(wdata->server, &wdata->credits, wdata->bytes);
- if (rc)
- return rc;
-
- if (wdata->cfile->invalidHandle)
- rc = -EAGAIN;
- else
- rc = wdata->server->ops->async_writev(wdata,
- cifs_writedata_release);
+ /* The folio should be locked, dirty and not undergoing writeback. */
+ if (folio_start_writeback(folio))
+ WARN_ON(1);
- return rc;
-}
+ count -= folio_nr_pages(folio);
+ len = folio_size(folio);
-static int
-cifs_writepage_locked(struct page *page, struct writeback_control *wbc);
+ xid = get_xid();
+ server = cifs_pick_channel(cifs_sb_master_tcon(cifs_sb)->ses);
-static int cifs_write_one_page(struct folio *folio,
- struct writeback_control *wbc, void *data)
-{
- struct address_space *mapping = data;
- int ret;
+ rc = cifs_get_writable_file(CIFS_I(inode), FIND_WR_ANY, &cfile);
+ if (rc) {
+ cifs_dbg(VFS, "No writable handle in writepages rc=%d\n", rc);
+ goto err_xid;
+ }
- ret = cifs_writepage_locked(&folio->page, wbc);
- folio_unlock(folio);
- mapping_set_error(mapping, ret);
- return ret;
-}
+ rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->wsize,
+ &wsize, credits);
+ if (rc != 0)
+ goto err_close;
-static int cifs_writepages(struct address_space *mapping,
- struct writeback_control *wbc)
-{
- struct inode *inode = mapping->host;
- struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
- struct TCP_Server_Info *server;
- bool done = false, scanned = false, range_whole = false;
- pgoff_t end, index;
- struct cifs_writedata *wdata;
- struct cifsFileInfo *cfile = NULL;
- int rc = 0;
- int saved_rc = 0;
- unsigned int xid;
+ wdata = cifs_writedata_alloc(cifs_writev_complete);
+ if (!wdata) {
+ rc = -ENOMEM;
+ goto err_uncredit;
+ }
- /*
- * If wsize is smaller than the page cache size, default to writing
- * one page at a time.
+ wdata->sync_mode = wbc->sync_mode;
+ wdata->offset = folio_pos(folio);
+ wdata->pid = cfile->pid;
+ wdata->credits = credits_on_stack;
+ wdata->cfile = cfile;
+ wdata->server = server;
+ cfile = NULL;
+
+ /* Find all consecutive lockable dirty pages, stopping when we find a
+ * page that is not immediately lockable, is not dirty or is missing,
+ * or we reach the end of the range.
*/
- if (cifs_sb->ctx->wsize < PAGE_SIZE)
- return write_cache_pages(mapping, wbc, cifs_write_one_page,
- mapping);
+ if (start < i_size) {
+ /* Trim the write to the EOF; the extra data is ignored. Also
+ * put an upper limit on the size of a single storedata op.
+ */
+ max_len = wsize;
+ max_len = min_t(unsigned long long, max_len, end - start + 1);
+ max_len = min_t(unsigned long long, max_len, i_size - start);
- xid = get_xid();
- if (wbc->range_cyclic) {
- index = mapping->writeback_index; /* Start from prev offset */
- end = -1;
- } else {
- index = wbc->range_start >> PAGE_SHIFT;
- end = wbc->range_end >> PAGE_SHIFT;
- if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
- range_whole = true;
- scanned = true;
+ if (len < max_len) {
+ int max_pages = INT_MAX;
+
+#ifdef CONFIG_CIFS_SMB_DIRECT
+ if (server->smbd_conn)
+ max_pages = server->smbd_conn->max_frmr_depth;
+#endif
+ max_pages -= folio_nr_pages(folio);
+
+ if (max_pages > 0)
+ cifs_extend_writeback(mapping, &count, start,
+ max_pages, max_len, &len);
+ }
+ len = min_t(loff_t, len, max_len);
}
- server = cifs_pick_channel(cifs_sb_master_tcon(cifs_sb)->ses);
-retry:
- while (!done && index <= end) {
- unsigned int i, nr_pages, found_pages, wsize;
- pgoff_t next = 0, tofind, saved_index = index;
- struct cifs_credits credits_on_stack;
- struct cifs_credits *credits = &credits_on_stack;
- int get_file_rc = 0;
+ wdata->bytes = len;
- if (cfile)
- cifsFileInfo_put(cfile);
+ /* We now have a contiguous set of dirty pages, each with writeback
+ * set; the first page is still locked at this point, but all the rest
+ * have been unlocked.
+ */
+ folio_unlock(folio);
- rc = cifs_get_writable_file(CIFS_I(inode), FIND_WR_ANY, &cfile);
+ if (start < i_size) {
+ iov_iter_xarray(&wdata->iter, ITER_SOURCE, &mapping->i_pages,
+ start, len);
- /* in case of an error store it to return later */
+ rc = adjust_credits(wdata->server, &wdata->credits, wdata->bytes);
if (rc)
- get_file_rc = rc;
+ goto err_wdata;
- rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->wsize,
- &wsize, credits);
- if (rc != 0) {
- done = true;
- break;
+ if (wdata->cfile->invalidHandle)
+ rc = -EAGAIN;
+ else
+ rc = wdata->server->ops->async_writev(wdata,
+ cifs_writedata_release);
+ if (rc >= 0) {
+ kref_put(&wdata->refcount, cifs_writedata_release);
+ goto err_close;
}
+ } else {
+ /* The dirty region was entirely beyond the EOF. */
+ cifs_pages_written_back(inode, start, len);
+ rc = 0;
+ }
- tofind = min((wsize / PAGE_SIZE) - 1, end - index) + 1;
+err_wdata:
+ kref_put(&wdata->refcount, cifs_writedata_release);
+err_uncredit:
+ add_credits_and_wake_if(server, credits, 0);
+err_close:
+ if (cfile)
+ cifsFileInfo_put(cfile);
+err_xid:
+ free_xid(xid);
+ if (rc == 0) {
+ wbc->nr_to_write = count;
+ } else if (is_retryable_error(rc)) {
+ cifs_pages_write_redirty(inode, start, len);
+ } else {
+ cifs_pages_write_failed(inode, start, len);
+ mapping_set_error(mapping, rc);
+ }
+ /* Indication to update ctime and mtime as close is deferred */
+ set_bit(CIFS_INO_MODIFIED_ATTR, &CIFS_I(inode)->flags);
+ return rc;
+}
- wdata = wdata_alloc_and_fillpages(tofind, mapping, end, &index,
- &found_pages);
- if (!wdata) {
- rc = -ENOMEM;
- done = true;
- add_credits_and_wake_if(server, credits, 0);
- break;
- }
+/*
+ * write a region of pages back to the server
+ */
+static int cifs_writepages_region(struct address_space *mapping,
+ struct writeback_control *wbc,
+ loff_t start, loff_t end, loff_t *_next)
+{
+ struct folio_batch fbatch;
+ int skips = 0;
- if (found_pages == 0) {
- kref_put(&wdata->refcount, cifs_writedata_release);
- add_credits_and_wake_if(server, credits, 0);
+ folio_batch_init(&fbatch);
+ do {
+ int nr;
+ pgoff_t index = start / PAGE_SIZE;
+
+ nr = filemap_get_folios_tag(mapping, &index, end / PAGE_SIZE,
+ PAGECACHE_TAG_DIRTY, &fbatch);
+ if (!nr)
break;
- }
- nr_pages = wdata_prepare_pages(wdata, found_pages, mapping, wbc,
- end, &index, &next, &done);
+ for (int i = 0; i < nr; i++) {
+ ssize_t ret;
+ struct folio *folio = fbatch.folios[i];
- /* nothing to write? */
- if (nr_pages == 0) {
- kref_put(&wdata->refcount, cifs_writedata_release);
- add_credits_and_wake_if(server, credits, 0);
- continue;
- }
+redo_folio:
+ start = folio_pos(folio); /* May regress with THPs */
- wdata->credits = credits_on_stack;
- wdata->cfile = cfile;
- wdata->server = server;
- cfile = NULL;
+ /* At this point we hold neither the i_pages lock nor the
+ * page lock: the page may be truncated or invalidated
+ * (changing page->mapping to NULL), or even swizzled
+ * back from swapper_space to tmpfs file mapping
+ */
+ if (wbc->sync_mode != WB_SYNC_NONE) {
+ ret = folio_lock_killable(folio);
+ if (ret < 0)
+ goto write_error;
+ } else {
+ if (!folio_trylock(folio))
+ goto skip_write;
+ }
- if (!wdata->cfile) {
- cifs_dbg(VFS, "No writable handle in writepages rc=%d\n",
- get_file_rc);
- if (is_retryable_error(get_file_rc))
- rc = get_file_rc;
- else
- rc = -EBADF;
- } else
- rc = wdata_send_pages(wdata, nr_pages, mapping, wbc);
+ if (folio_mapping(folio) != mapping ||
+ !folio_test_dirty(folio)) {
+ folio_unlock(folio);
+ goto skip_write;
+ }
- for (i = 0; i < nr_pages; ++i)
- unlock_page(wdata->pages[i]);
+ if (folio_test_writeback(folio) ||
+ folio_test_fscache(folio)) {
+ folio_unlock(folio);
+ if (wbc->sync_mode == WB_SYNC_NONE)
+ goto skip_write;
- /* send failure -- clean up the mess */
- if (rc != 0) {
- add_credits_and_wake_if(server, &wdata->credits, 0);
- for (i = 0; i < nr_pages; ++i) {
- if (is_retryable_error(rc))
- redirty_page_for_writepage(wbc,
- wdata->pages[i]);
- else
- SetPageError(wdata->pages[i]);
- end_page_writeback(wdata->pages[i]);
- put_page(wdata->pages[i]);
+ folio_wait_writeback(folio);
+#ifdef CONFIG_CIFS_FSCACHE
+ folio_wait_fscache(folio);
+#endif
+ goto redo_folio;
}
- if (!is_retryable_error(rc))
- mapping_set_error(mapping, rc);
- }
- kref_put(&wdata->refcount, cifs_writedata_release);
- if (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN) {
- index = saved_index;
- continue;
- }
+ if (!folio_clear_dirty_for_io(folio))
+ /* We hold the page lock - it should've been dirty. */
+ WARN_ON(1);
- /* Return immediately if we received a signal during writing */
- if (is_interrupt_error(rc)) {
- done = true;
- break;
- }
+ ret = cifs_write_back_from_locked_folio(mapping, wbc, folio, start, end);
+ if (ret < 0)
+ goto write_error;
- if (rc != 0 && saved_rc == 0)
- saved_rc = rc;
+ start += ret;
+ continue;
- wbc->nr_to_write -= nr_pages;
- if (wbc->nr_to_write <= 0)
- done = true;
+write_error:
+ folio_batch_release(&fbatch);
+ *_next = start;
+ return ret;
- index = next;
- }
+skip_write:
+ /*
+ * Too many skipped writes, or need to reschedule?
+ * Treat it as a write error without an error code.
+ */
+ if (skips >= 5 || need_resched()) {
+ ret = 0;
+ goto write_error;
+ }
- if (!scanned && !done) {
- /*
- * We hit the last page and there is more work to be done: wrap
- * back to the start of the file
- */
- scanned = true;
- index = 0;
- goto retry;
- }
+ /* Otherwise, just skip that folio and go on to the next */
+ skips++;
+ start += folio_size(folio);
+ continue;
+ }
- if (saved_rc != 0)
- rc = saved_rc;
+ folio_batch_release(&fbatch);
+ cond_resched();
+ } while (wbc->nr_to_write > 0);
- if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
- mapping->writeback_index = index;
+ *_next = start;
+ return 0;
+}
- if (cfile)
- cifsFileInfo_put(cfile);
- free_xid(xid);
- /* Indication to update ctime and mtime as close is deferred */
- set_bit(CIFS_INO_MODIFIED_ATTR, &CIFS_I(inode)->flags);
- return rc;
+/*
+ * Write some of the pending data back to the server
+ */
+static int cifs_writepages(struct address_space *mapping,
+ struct writeback_control *wbc)
+{
+ loff_t start, next;
+ int ret;
+
+ /* We have to be careful as we can end up racing with setattr()
+ * truncating the pagecache since the caller doesn't take a lock here
+ * to prevent it.
+ */
+
+ if (wbc->range_cyclic) {
+ start = mapping->writeback_index * PAGE_SIZE;
+ ret = cifs_writepages_region(mapping, wbc, start, LLONG_MAX, &next);
+ if (ret == 0) {
+ mapping->writeback_index = next / PAGE_SIZE;
+ if (start > 0 && wbc->nr_to_write > 0) {
+ ret = cifs_writepages_region(mapping, wbc, 0,
+ start, &next);
+ if (ret == 0)
+ mapping->writeback_index =
+ next / PAGE_SIZE;
+ }
+ }
+ } else if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) {
+ ret = cifs_writepages_region(mapping, wbc, 0, LLONG_MAX, &next);
+ if (wbc->nr_to_write > 0 && ret == 0)
+ mapping->writeback_index = next / PAGE_SIZE;
+ } else {
+ ret = cifs_writepages_region(mapping, wbc,
+ wbc->range_start, wbc->range_end, &next);
+ }
+
+ return ret;
}
static int
struct inode *inode = mapping->host;
struct cifsFileInfo *cfile = file->private_data;
struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
+ struct folio *folio = page_folio(page);
__u32 pid;
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
cifs_dbg(FYI, "write_end for page %p from pos %lld with %d bytes\n",
page, pos, copied);
- if (PageChecked(page)) {
+ if (folio_test_checked(folio)) {
if (copied == len)
- SetPageUptodate(page);
- ClearPageChecked(page);
- } else if (!PageUptodate(page) && copied == PAGE_SIZE)
- SetPageUptodate(page);
+ folio_mark_uptodate(folio);
+ folio_clear_checked(folio);
+ } else if (!folio_test_uptodate(folio) && copied == PAGE_SIZE)
+ folio_mark_uptodate(folio);
- if (!PageUptodate(page)) {
+ if (!folio_test_uptodate(folio)) {
char *page_data;
unsigned offset = pos & (PAGE_SIZE - 1);
unsigned int xid;
return rc;
}
-static int
-cifs_write_allocate_pages(struct page **pages, unsigned long num_pages)
-{
- int rc = 0;
- unsigned long i;
-
- for (i = 0; i < num_pages; i++) {
- pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
- if (!pages[i]) {
- /*
- * save number of pages we have already allocated and
- * return with ENOMEM error
- */
- num_pages = i;
- rc = -ENOMEM;
- break;
- }
- }
-
- if (rc) {
- for (i = 0; i < num_pages; i++)
- put_page(pages[i]);
- }
- return rc;
-}
-
-static inline
-size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len)
-{
- size_t num_pages;
- size_t clen;
-
- clen = min_t(const size_t, len, wsize);
- num_pages = DIV_ROUND_UP(clen, PAGE_SIZE);
-
- if (cur_len)
- *cur_len = clen;
-
- return num_pages;
-}
-
static void
cifs_uncached_writedata_release(struct kref *refcount)
{
- int i;
struct cifs_writedata *wdata = container_of(refcount,
struct cifs_writedata, refcount);
kref_put(&wdata->ctx->refcount, cifs_aio_ctx_release);
- for (i = 0; i < wdata->nr_pages; i++)
- put_page(wdata->pages[i]);
cifs_writedata_release(refcount);
}
kref_put(&wdata->refcount, cifs_uncached_writedata_release);
}
-static int
-wdata_fill_from_iovec(struct cifs_writedata *wdata, struct iov_iter *from,
- size_t *len, unsigned long *num_pages)
-{
- size_t save_len, copied, bytes, cur_len = *len;
- unsigned long i, nr_pages = *num_pages;
-
- save_len = cur_len;
- for (i = 0; i < nr_pages; i++) {
- bytes = min_t(const size_t, cur_len, PAGE_SIZE);
- copied = copy_page_from_iter(wdata->pages[i], 0, bytes, from);
- cur_len -= copied;
- /*
- * If we didn't copy as much as we expected, then that
- * may mean we trod into an unmapped area. Stop copying
- * at that point. On the next pass through the big
- * loop, we'll likely end up getting a zero-length
- * write and bailing out of it.
- */
- if (copied < bytes)
- break;
- }
- cur_len = save_len - cur_len;
- *len = cur_len;
-
- /*
- * If we have no data to send, then that probably means that
- * the copy above failed altogether. That's most likely because
- * the address in the iovec was bogus. Return -EFAULT and let
- * the caller free anything we allocated and bail out.
- */
- if (!cur_len)
- return -EFAULT;
-
- /*
- * i + 1 now represents the number of pages we actually used in
- * the copy phase above.
- */
- *num_pages = i + 1;
- return 0;
-}
-
static int
cifs_resend_wdata(struct cifs_writedata *wdata, struct list_head *wdata_list,
struct cifs_aio_ctx *ctx)
return rc;
}
+/*
+ * Select span of a bvec iterator we're going to use. Limit it by both maximum
+ * size and maximum number of segments.
+ */
+static size_t cifs_limit_bvec_subset(const struct iov_iter *iter, size_t max_size,
+ size_t max_segs, unsigned int *_nsegs)
+{
+ const struct bio_vec *bvecs = iter->bvec;
+ unsigned int nbv = iter->nr_segs, ix = 0, nsegs = 0;
+ size_t len, span = 0, n = iter->count;
+ size_t skip = iter->iov_offset;
+
+ if (WARN_ON(!iov_iter_is_bvec(iter)) || n == 0)
+ return 0;
+
+ while (n && ix < nbv && skip) {
+ len = bvecs[ix].bv_len;
+ if (skip < len)
+ break;
+ skip -= len;
+ n -= len;
+ ix++;
+ }
+
+ while (n && ix < nbv) {
+ len = min3(n, bvecs[ix].bv_len - skip, max_size);
+ span += len;
+ nsegs++;
+ ix++;
+ if (span >= max_size || nsegs >= max_segs)
+ break;
+ skip = 0;
+ n -= len;
+ }
+
+ *_nsegs = nsegs;
+ return span;
+}
+
static int
-cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from,
+cifs_write_from_iter(loff_t fpos, size_t len, struct iov_iter *from,
struct cifsFileInfo *open_file,
struct cifs_sb_info *cifs_sb, struct list_head *wdata_list,
struct cifs_aio_ctx *ctx)
{
int rc = 0;
- size_t cur_len;
- unsigned long nr_pages, num_pages, i;
+ size_t cur_len, max_len;
struct cifs_writedata *wdata;
- struct iov_iter saved_from = *from;
- loff_t saved_offset = offset;
pid_t pid;
struct TCP_Server_Info *server;
- struct page **pagevec;
- size_t start;
- unsigned int xid;
+ unsigned int xid, max_segs = INT_MAX;
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
pid = open_file->pid;
server = cifs_pick_channel(tlink_tcon(open_file->tlink)->ses);
xid = get_xid();
+#ifdef CONFIG_CIFS_SMB_DIRECT
+ if (server->smbd_conn)
+ max_segs = server->smbd_conn->max_frmr_depth;
+#endif
+
do {
- unsigned int wsize;
struct cifs_credits credits_on_stack;
struct cifs_credits *credits = &credits_on_stack;
+ unsigned int wsize, nsegs = 0;
+
+ if (signal_pending(current)) {
+ rc = -EINTR;
+ break;
+ }
if (open_file->invalidHandle) {
rc = cifs_reopen_file(open_file, false);
if (rc)
break;
- cur_len = min_t(const size_t, len, wsize);
-
- if (ctx->direct_io) {
- ssize_t result;
-
- result = iov_iter_get_pages_alloc2(
- from, &pagevec, cur_len, &start);
- if (result < 0) {
- cifs_dbg(VFS,
- "direct_writev couldn't get user pages (rc=%zd) iter type %d iov_offset %zd count %zd\n",
- result, iov_iter_type(from),
- from->iov_offset, from->count);
- dump_stack();
-
- rc = result;
- add_credits_and_wake_if(server, credits, 0);
- break;
- }
- cur_len = (size_t)result;
-
- nr_pages =
- (cur_len + start + PAGE_SIZE - 1) / PAGE_SIZE;
-
- wdata = cifs_writedata_direct_alloc(pagevec,
- cifs_uncached_writev_complete);
- if (!wdata) {
- rc = -ENOMEM;
- for (i = 0; i < nr_pages; i++)
- put_page(pagevec[i]);
- kvfree(pagevec);
- add_credits_and_wake_if(server, credits, 0);
- break;
- }
-
-
- wdata->page_offset = start;
- wdata->tailsz =
- nr_pages > 1 ?
- cur_len - (PAGE_SIZE - start) -
- (nr_pages - 2) * PAGE_SIZE :
- cur_len;
- } else {
- nr_pages = get_numpages(wsize, len, &cur_len);
- wdata = cifs_writedata_alloc(nr_pages,
- cifs_uncached_writev_complete);
- if (!wdata) {
- rc = -ENOMEM;
- add_credits_and_wake_if(server, credits, 0);
- break;
- }
-
- rc = cifs_write_allocate_pages(wdata->pages, nr_pages);
- if (rc) {
- kvfree(wdata->pages);
- kfree(wdata);
- add_credits_and_wake_if(server, credits, 0);
- break;
- }
-
- num_pages = nr_pages;
- rc = wdata_fill_from_iovec(
- wdata, from, &cur_len, &num_pages);
- if (rc) {
- for (i = 0; i < nr_pages; i++)
- put_page(wdata->pages[i]);
- kvfree(wdata->pages);
- kfree(wdata);
- add_credits_and_wake_if(server, credits, 0);
- break;
- }
+ max_len = min_t(const size_t, len, wsize);
+ if (!max_len) {
+ rc = -EAGAIN;
+ add_credits_and_wake_if(server, credits, 0);
+ break;
+ }
- /*
- * Bring nr_pages down to the number of pages we
- * actually used, and free any pages that we didn't use.
- */
- for ( ; nr_pages > num_pages; nr_pages--)
- put_page(wdata->pages[nr_pages - 1]);
+ cur_len = cifs_limit_bvec_subset(from, max_len, max_segs, &nsegs);
+ cifs_dbg(FYI, "write_from_iter len=%zx/%zx nsegs=%u/%lu/%u\n",
+ cur_len, max_len, nsegs, from->nr_segs, max_segs);
+ if (cur_len == 0) {
+ rc = -EIO;
+ add_credits_and_wake_if(server, credits, 0);
+ break;
+ }
- wdata->tailsz = cur_len - ((nr_pages - 1) * PAGE_SIZE);
+ wdata = cifs_writedata_alloc(cifs_uncached_writev_complete);
+ if (!wdata) {
+ rc = -ENOMEM;
+ add_credits_and_wake_if(server, credits, 0);
+ break;
}
wdata->sync_mode = WB_SYNC_ALL;
- wdata->nr_pages = nr_pages;
- wdata->offset = (__u64)offset;
- wdata->cfile = cifsFileInfo_get(open_file);
- wdata->server = server;
- wdata->pid = pid;
- wdata->bytes = cur_len;
- wdata->pagesz = PAGE_SIZE;
- wdata->credits = credits_on_stack;
- wdata->ctx = ctx;
+ wdata->offset = (__u64)fpos;
+ wdata->cfile = cifsFileInfo_get(open_file);
+ wdata->server = server;
+ wdata->pid = pid;
+ wdata->bytes = cur_len;
+ wdata->credits = credits_on_stack;
+ wdata->iter = *from;
+ wdata->ctx = ctx;
kref_get(&ctx->refcount);
+ iov_iter_truncate(&wdata->iter, cur_len);
+
rc = adjust_credits(server, &wdata->credits, wdata->bytes);
if (!rc) {
add_credits_and_wake_if(server, &wdata->credits, 0);
kref_put(&wdata->refcount,
cifs_uncached_writedata_release);
- if (rc == -EAGAIN) {
- *from = saved_from;
- iov_iter_advance(from, offset - saved_offset);
+ if (rc == -EAGAIN)
continue;
- }
break;
}
list_add_tail(&wdata->list, wdata_list);
- offset += cur_len;
+ iov_iter_advance(from, cur_len);
+ fpos += cur_len;
len -= cur_len;
} while (len > 0);
struct cifs_tcon *tcon;
struct cifs_sb_info *cifs_sb;
struct cifs_aio_ctx *ctx;
- struct iov_iter saved_from = *from;
- size_t len = iov_iter_count(from);
int rc;
- /*
- * iov_iter_get_pages_alloc doesn't work with ITER_KVEC.
- * In this case, fall back to non-direct write function.
- * this could be improved by getting pages directly in ITER_KVEC
- */
- if (direct && iov_iter_is_kvec(from)) {
- cifs_dbg(FYI, "use non-direct cifs_writev for kvec I/O\n");
- direct = false;
- }
-
rc = generic_write_checks(iocb, from);
if (rc <= 0)
return rc;
ctx->iocb = iocb;
ctx->pos = iocb->ki_pos;
+ ctx->direct_io = direct;
+ ctx->nr_pinned_pages = 0;
- if (direct) {
- ctx->direct_io = true;
- ctx->iter = *from;
- ctx->len = len;
- } else {
- rc = setup_aio_ctx_iter(ctx, from, ITER_SOURCE);
- if (rc) {
+ if (user_backed_iter(from)) {
+ /*
+ * Extract IOVEC/UBUF-type iterators to a BVEC-type iterator as
+ * they contain references to the calling process's virtual
+ * memory layout which won't be available in an async worker
+ * thread. This also takes a pin on every folio involved.
+ */
+ rc = netfs_extract_user_iter(from, iov_iter_count(from),
+ &ctx->iter, 0);
+ if (rc < 0) {
kref_put(&ctx->refcount, cifs_aio_ctx_release);
return rc;
}
+
+ ctx->nr_pinned_pages = rc;
+ ctx->bv = (void *)ctx->iter.bvec;
+ ctx->bv_need_unpin = iov_iter_extract_will_pin(&ctx->iter);
+ } else if ((iov_iter_is_bvec(from) || iov_iter_is_kvec(from)) &&
+ !is_sync_kiocb(iocb)) {
+ /*
+ * If the op is asynchronous, we need to copy the list attached
+ * to a BVEC/KVEC-type iterator, but we assume that the storage
+ * will be pinned by the caller; in any case, we may or may not
+ * be able to pin the pages, so we don't try.
+ */
+ ctx->bv = (void *)dup_iter(&ctx->iter, from, GFP_KERNEL);
+ if (!ctx->bv) {
+ kref_put(&ctx->refcount, cifs_aio_ctx_release);
+ return -ENOMEM;
+ }
+ } else {
+ /*
+ * Otherwise, we just pass the iterator down as-is and rely on
+ * the caller to make sure the pages referred to by the
+ * iterator don't evaporate.
+ */
+ ctx->iter = *from;
}
+ ctx->len = iov_iter_count(&ctx->iter);
+
/* grab a lock here due to read response handlers can access ctx */
mutex_lock(&ctx->aio_mutex);
- rc = cifs_write_from_iter(iocb->ki_pos, ctx->len, &saved_from,
+ rc = cifs_write_from_iter(iocb->ki_pos, ctx->len, &ctx->iter,
cfile, cifs_sb, &ctx->list, ctx);
/*
return written;
}
-static struct cifs_readdata *
-cifs_readdata_direct_alloc(struct page **pages, work_func_t complete)
+static struct cifs_readdata *cifs_readdata_alloc(work_func_t complete)
{
struct cifs_readdata *rdata;
rdata = kzalloc(sizeof(*rdata), GFP_KERNEL);
- if (rdata != NULL) {
- rdata->pages = pages;
+ if (rdata) {
kref_init(&rdata->refcount);
INIT_LIST_HEAD(&rdata->list);
init_completion(&rdata->done);
return rdata;
}
-static struct cifs_readdata *
-cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete)
-{
- struct page **pages =
- kcalloc(nr_pages, sizeof(struct page *), GFP_KERNEL);
- struct cifs_readdata *ret = NULL;
-
- if (pages) {
- ret = cifs_readdata_direct_alloc(pages, complete);
- if (!ret)
- kfree(pages);
- }
-
- return ret;
-}
-
void
cifs_readdata_release(struct kref *refcount)
{
struct cifs_readdata *rdata = container_of(refcount,
struct cifs_readdata, refcount);
+
+ if (rdata->ctx)
+ kref_put(&rdata->ctx->refcount, cifs_aio_ctx_release);
#ifdef CONFIG_CIFS_SMB_DIRECT
if (rdata->mr) {
smbd_deregister_mr(rdata->mr);
if (rdata->cfile)
cifsFileInfo_put(rdata->cfile);
- kvfree(rdata->pages);
kfree(rdata);
}
-static int
-cifs_read_allocate_pages(struct cifs_readdata *rdata, unsigned int nr_pages)
-{
- int rc = 0;
- struct page *page;
- unsigned int i;
-
- for (i = 0; i < nr_pages; i++) {
- page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
- if (!page) {
- rc = -ENOMEM;
- break;
- }
- rdata->pages[i] = page;
- }
-
- if (rc) {
- unsigned int nr_page_failed = i;
-
- for (i = 0; i < nr_page_failed; i++) {
- put_page(rdata->pages[i]);
- rdata->pages[i] = NULL;
- }
- }
- return rc;
-}
-
-static void
-cifs_uncached_readdata_release(struct kref *refcount)
-{
- struct cifs_readdata *rdata = container_of(refcount,
- struct cifs_readdata, refcount);
- unsigned int i;
-
- kref_put(&rdata->ctx->refcount, cifs_aio_ctx_release);
- for (i = 0; i < rdata->nr_pages; i++) {
- put_page(rdata->pages[i]);
- }
- cifs_readdata_release(refcount);
-}
-
-/**
- * cifs_readdata_to_iov - copy data from pages in response to an iovec
- * @rdata: the readdata response with list of pages holding data
- * @iter: destination for our data
- *
- * This function copies data from a list of pages in a readdata response into
- * an array of iovecs. It will first calculate where the data should go
- * based on the info in the readdata and then copy the data into that spot.
- */
-static int
-cifs_readdata_to_iov(struct cifs_readdata *rdata, struct iov_iter *iter)
-{
- size_t remaining = rdata->got_bytes;
- unsigned int i;
-
- for (i = 0; i < rdata->nr_pages; i++) {
- struct page *page = rdata->pages[i];
- size_t copy = min_t(size_t, remaining, PAGE_SIZE);
- size_t written;
-
- if (unlikely(iov_iter_is_pipe(iter))) {
- void *addr = kmap_atomic(page);
-
- written = copy_to_iter(addr, copy, iter);
- kunmap_atomic(addr);
- } else
- written = copy_page_to_iter(page, 0, copy, iter);
- remaining -= written;
- if (written < copy && iov_iter_count(iter) > 0)
- break;
- }
- return remaining ? -EFAULT : 0;
-}
-
static void collect_uncached_read_data(struct cifs_aio_ctx *ctx);
static void
complete(&rdata->done);
collect_uncached_read_data(rdata->ctx);
/* the below call can possibly free the last ref to aio ctx */
- kref_put(&rdata->refcount, cifs_uncached_readdata_release);
-}
-
-static int
-uncached_fill_pages(struct TCP_Server_Info *server,
- struct cifs_readdata *rdata, struct iov_iter *iter,
- unsigned int len)
-{
- int result = 0;
- unsigned int i;
- unsigned int nr_pages = rdata->nr_pages;
- unsigned int page_offset = rdata->page_offset;
-
- rdata->got_bytes = 0;
- rdata->tailsz = PAGE_SIZE;
- for (i = 0; i < nr_pages; i++) {
- struct page *page = rdata->pages[i];
- size_t n;
- unsigned int segment_size = rdata->pagesz;
-
- if (i == 0)
- segment_size -= page_offset;
- else
- page_offset = 0;
-
-
- if (len <= 0) {
- /* no need to hold page hostage */
- rdata->pages[i] = NULL;
- rdata->nr_pages--;
- put_page(page);
- continue;
- }
-
- n = len;
- if (len >= segment_size)
- /* enough data to fill the page */
- n = segment_size;
- else
- rdata->tailsz = len;
- len -= n;
-
- if (iter)
- result = copy_page_from_iter(
- page, page_offset, n, iter);
-#ifdef CONFIG_CIFS_SMB_DIRECT
- else if (rdata->mr)
- result = n;
-#endif
- else
- result = cifs_read_page_from_socket(
- server, page, page_offset, n);
- if (result < 0)
- break;
-
- rdata->got_bytes += result;
- }
-
- return rdata->got_bytes > 0 && result != -ECONNABORTED ?
- rdata->got_bytes : result;
-}
-
-static int
-cifs_uncached_read_into_pages(struct TCP_Server_Info *server,
- struct cifs_readdata *rdata, unsigned int len)
-{
- return uncached_fill_pages(server, rdata, NULL, len);
-}
-
-static int
-cifs_uncached_copy_into_pages(struct TCP_Server_Info *server,
- struct cifs_readdata *rdata,
- struct iov_iter *iter)
-{
- return uncached_fill_pages(server, rdata, iter, iter->count);
+ kref_put(&rdata->refcount, cifs_readdata_release);
}
static int cifs_resend_rdata(struct cifs_readdata *rdata,
} while (rc == -EAGAIN);
fail:
- kref_put(&rdata->refcount, cifs_uncached_readdata_release);
+ kref_put(&rdata->refcount, cifs_readdata_release);
return rc;
}
static int
-cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file,
+cifs_send_async_read(loff_t fpos, size_t len, struct cifsFileInfo *open_file,
struct cifs_sb_info *cifs_sb, struct list_head *rdata_list,
struct cifs_aio_ctx *ctx)
{
struct cifs_readdata *rdata;
- unsigned int npages, rsize;
+ unsigned int rsize, nsegs, max_segs = INT_MAX;
struct cifs_credits credits_on_stack;
struct cifs_credits *credits = &credits_on_stack;
- size_t cur_len;
+ size_t cur_len, max_len;
int rc;
pid_t pid;
struct TCP_Server_Info *server;
- struct page **pagevec;
- size_t start;
- struct iov_iter direct_iov = ctx->iter;
server = cifs_pick_channel(tlink_tcon(open_file->tlink)->ses);
+#ifdef CONFIG_CIFS_SMB_DIRECT
+ if (server->smbd_conn)
+ max_segs = server->smbd_conn->max_frmr_depth;
+#endif
+
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
pid = open_file->pid;
else
pid = current->tgid;
- if (ctx->direct_io)
- iov_iter_advance(&direct_iov, offset - ctx->pos);
-
do {
if (open_file->invalidHandle) {
rc = cifs_reopen_file(open_file, true);
if (rc)
break;
- cur_len = min_t(const size_t, len, rsize);
-
- if (ctx->direct_io) {
- ssize_t result;
-
- result = iov_iter_get_pages_alloc2(
- &direct_iov, &pagevec,
- cur_len, &start);
- if (result < 0) {
- cifs_dbg(VFS,
- "Couldn't get user pages (rc=%zd) iter type %d iov_offset %zd count %zd\n",
- result, iov_iter_type(&direct_iov),
- direct_iov.iov_offset,
- direct_iov.count);
- dump_stack();
-
- rc = result;
- add_credits_and_wake_if(server, credits, 0);
- break;
- }
- cur_len = (size_t)result;
-
- rdata = cifs_readdata_direct_alloc(
- pagevec, cifs_uncached_readv_complete);
- if (!rdata) {
- add_credits_and_wake_if(server, credits, 0);
- rc = -ENOMEM;
- break;
- }
-
- npages = (cur_len + start + PAGE_SIZE-1) / PAGE_SIZE;
- rdata->page_offset = start;
- rdata->tailsz = npages > 1 ?
- cur_len-(PAGE_SIZE-start)-(npages-2)*PAGE_SIZE :
- cur_len;
+ max_len = min_t(size_t, len, rsize);
- } else {
-
- npages = DIV_ROUND_UP(cur_len, PAGE_SIZE);
- /* allocate a readdata struct */
- rdata = cifs_readdata_alloc(npages,
- cifs_uncached_readv_complete);
- if (!rdata) {
- add_credits_and_wake_if(server, credits, 0);
- rc = -ENOMEM;
- break;
- }
-
- rc = cifs_read_allocate_pages(rdata, npages);
- if (rc) {
- kvfree(rdata->pages);
- kfree(rdata);
- add_credits_and_wake_if(server, credits, 0);
- break;
- }
+ cur_len = cifs_limit_bvec_subset(&ctx->iter, max_len,
+ max_segs, &nsegs);
+ cifs_dbg(FYI, "read-to-iter len=%zx/%zx nsegs=%u/%lu/%u\n",
+ cur_len, max_len, nsegs, ctx->iter.nr_segs, max_segs);
+ if (cur_len == 0) {
+ rc = -EIO;
+ add_credits_and_wake_if(server, credits, 0);
+ break;
+ }
- rdata->tailsz = PAGE_SIZE;
+ rdata = cifs_readdata_alloc(cifs_uncached_readv_complete);
+ if (!rdata) {
+ add_credits_and_wake_if(server, credits, 0);
+ rc = -ENOMEM;
+ break;
}
- rdata->server = server;
- rdata->cfile = cifsFileInfo_get(open_file);
- rdata->nr_pages = npages;
- rdata->offset = offset;
- rdata->bytes = cur_len;
- rdata->pid = pid;
- rdata->pagesz = PAGE_SIZE;
- rdata->read_into_pages = cifs_uncached_read_into_pages;
- rdata->copy_into_pages = cifs_uncached_copy_into_pages;
- rdata->credits = credits_on_stack;
- rdata->ctx = ctx;
+ rdata->server = server;
+ rdata->cfile = cifsFileInfo_get(open_file);
+ rdata->offset = fpos;
+ rdata->bytes = cur_len;
+ rdata->pid = pid;
+ rdata->credits = credits_on_stack;
+ rdata->ctx = ctx;
kref_get(&ctx->refcount);
+ rdata->iter = ctx->iter;
+ iov_iter_truncate(&rdata->iter, cur_len);
+
rc = adjust_credits(server, &rdata->credits, rdata->bytes);
if (!rc) {
if (rc) {
add_credits_and_wake_if(server, &rdata->credits, 0);
- kref_put(&rdata->refcount,
- cifs_uncached_readdata_release);
- if (rc == -EAGAIN) {
- iov_iter_revert(&direct_iov, cur_len);
+ kref_put(&rdata->refcount, cifs_readdata_release);
+ if (rc == -EAGAIN)
continue;
- }
break;
}
list_add_tail(&rdata->list, rdata_list);
- offset += cur_len;
+ iov_iter_advance(&ctx->iter, cur_len);
+ fpos += cur_len;
len -= cur_len;
} while (len > 0);
list_del_init(&rdata->list);
INIT_LIST_HEAD(&tmp_list);
- /*
- * Got a part of data and then reconnect has
- * happened -- fill the buffer and continue
- * reading.
- */
- if (got_bytes && got_bytes < rdata->bytes) {
- rc = 0;
- if (!ctx->direct_io)
- rc = cifs_readdata_to_iov(rdata, to);
- if (rc) {
- kref_put(&rdata->refcount,
- cifs_uncached_readdata_release);
- continue;
- }
- }
-
if (ctx->direct_io) {
/*
* Re-use rdata as this is a
&tmp_list, ctx);
kref_put(&rdata->refcount,
- cifs_uncached_readdata_release);
+ cifs_readdata_release);
}
list_splice(&tmp_list, &ctx->list);
goto again;
} else if (rdata->result)
rc = rdata->result;
- else if (!ctx->direct_io)
- rc = cifs_readdata_to_iov(rdata, to);
/* if there was a short read -- discard anything left */
if (rdata->got_bytes && rdata->got_bytes < rdata->bytes)
ctx->total_len += rdata->got_bytes;
}
list_del_init(&rdata->list);
- kref_put(&rdata->refcount, cifs_uncached_readdata_release);
+ kref_put(&rdata->refcount, cifs_readdata_release);
}
if (!ctx->direct_io)
loff_t offset = iocb->ki_pos;
struct cifs_aio_ctx *ctx;
- /*
- * iov_iter_get_pages_alloc() doesn't work with ITER_KVEC,
- * fall back to data copy read path
- * this could be improved by getting pages directly in ITER_KVEC
- */
- if (direct && iov_iter_is_kvec(to)) {
- cifs_dbg(FYI, "use non-direct cifs_user_readv for kvec I/O\n");
- direct = false;
- }
-
len = iov_iter_count(to);
if (!len)
return 0;
if (!ctx)
return -ENOMEM;
- ctx->cfile = cifsFileInfo_get(cfile);
+ ctx->pos = offset;
+ ctx->direct_io = direct;
+ ctx->len = len;
+ ctx->cfile = cifsFileInfo_get(cfile);
+ ctx->nr_pinned_pages = 0;
if (!is_sync_kiocb(iocb))
ctx->iocb = iocb;
- if (user_backed_iter(to))
- ctx->should_dirty = true;
-
- if (direct) {
- ctx->pos = offset;
- ctx->direct_io = true;
- ctx->iter = *to;
- ctx->len = len;
- } else {
- rc = setup_aio_ctx_iter(ctx, to, ITER_DEST);
- if (rc) {
+ if (user_backed_iter(to)) {
+ /*
+ * Extract IOVEC/UBUF-type iterators to a BVEC-type iterator as
+ * they contain references to the calling process's virtual
+ * memory layout which won't be available in an async worker
+ * thread. This also takes a pin on every folio involved.
+ */
+ rc = netfs_extract_user_iter(to, iov_iter_count(to),
+ &ctx->iter, 0);
+ if (rc < 0) {
kref_put(&ctx->refcount, cifs_aio_ctx_release);
return rc;
}
- len = ctx->len;
+
+ ctx->nr_pinned_pages = rc;
+ ctx->bv = (void *)ctx->iter.bvec;
+ ctx->bv_need_unpin = iov_iter_extract_will_pin(&ctx->iter);
+ ctx->should_dirty = true;
+ } else if ((iov_iter_is_bvec(to) || iov_iter_is_kvec(to)) &&
+ !is_sync_kiocb(iocb)) {
+ /*
+ * If the op is asynchronous, we need to copy the list attached
+ * to a BVEC/KVEC-type iterator, but we assume that the storage
+ * will be retained by the caller; in any case, we may or may
+ * not be able to pin the pages, so we don't try.
+ */
+ ctx->bv = (void *)dup_iter(&ctx->iter, to, GFP_KERNEL);
+ if (!ctx->bv) {
+ kref_put(&ctx->refcount, cifs_aio_ctx_release);
+ return -ENOMEM;
+ }
+ } else {
+ /*
+ * Otherwise, we just pass the iterator down as-is and rely on
+ * the caller to make sure the pages referred to by the
+ * iterator don't evaporate.
+ */
+ ctx->iter = *to;
}
if (direct) {
* If the page is mmap'ed into a process' page tables, then we need to make
* sure that it doesn't change while being written back.
*/
-static vm_fault_t
-cifs_page_mkwrite(struct vm_fault *vmf)
+static vm_fault_t cifs_page_mkwrite(struct vm_fault *vmf)
{
- struct page *page = vmf->page;
+ struct folio *folio = page_folio(vmf->page);
- /* Wait for the page to be written to the cache before we allow it to
- * be modified. We then assume the entire page will need writing back.
+ /* Wait for the folio to be written to the cache before we allow it to
+ * be modified. We then assume the entire folio will need writing back.
*/
#ifdef CONFIG_CIFS_FSCACHE
- if (PageFsCache(page) &&
- wait_on_page_fscache_killable(page) < 0)
+ if (folio_test_fscache(folio) &&
+ folio_wait_fscache_killable(folio) < 0)
return VM_FAULT_RETRY;
#endif
- wait_on_page_writeback(page);
+ folio_wait_writeback(folio);
- if (lock_page_killable(page) < 0)
+ if (folio_lock_killable(folio) < 0)
return VM_FAULT_RETRY;
return VM_FAULT_LOCKED;
}
return rc;
}
-static void
-cifs_readv_complete(struct work_struct *work)
+/*
+ * Unlock a bunch of folios in the pagecache.
+ */
+static void cifs_unlock_folios(struct address_space *mapping, pgoff_t first, pgoff_t last)
{
- unsigned int i, got_bytes;
- struct cifs_readdata *rdata = container_of(work,
- struct cifs_readdata, work);
-
- got_bytes = rdata->got_bytes;
- for (i = 0; i < rdata->nr_pages; i++) {
- struct page *page = rdata->pages[i];
-
- if (rdata->result == 0 ||
- (rdata->result == -EAGAIN && got_bytes)) {
- flush_dcache_page(page);
- SetPageUptodate(page);
- } else
- SetPageError(page);
-
- if (rdata->result == 0 ||
- (rdata->result == -EAGAIN && got_bytes))
- cifs_readpage_to_fscache(rdata->mapping->host, page);
-
- unlock_page(page);
+ struct folio *folio;
+ XA_STATE(xas, &mapping->i_pages, first);
- got_bytes -= min_t(unsigned int, PAGE_SIZE, got_bytes);
-
- put_page(page);
- rdata->pages[i] = NULL;
+ rcu_read_lock();
+ xas_for_each(&xas, folio, last) {
+ folio_unlock(folio);
}
- kref_put(&rdata->refcount, cifs_readdata_release);
+ rcu_read_unlock();
}
-static int
-readpages_fill_pages(struct TCP_Server_Info *server,
- struct cifs_readdata *rdata, struct iov_iter *iter,
- unsigned int len)
+static void cifs_readahead_complete(struct work_struct *work)
{
- int result = 0;
- unsigned int i;
- u64 eof;
- pgoff_t eof_index;
- unsigned int nr_pages = rdata->nr_pages;
- unsigned int page_offset = rdata->page_offset;
-
- /* determine the eof that the server (probably) has */
- eof = CIFS_I(rdata->mapping->host)->server_eof;
- eof_index = eof ? (eof - 1) >> PAGE_SHIFT : 0;
- cifs_dbg(FYI, "eof=%llu eof_index=%lu\n", eof, eof_index);
-
- rdata->got_bytes = 0;
- rdata->tailsz = PAGE_SIZE;
- for (i = 0; i < nr_pages; i++) {
- struct page *page = rdata->pages[i];
- unsigned int to_read = rdata->pagesz;
- size_t n;
-
- if (i == 0)
- to_read -= page_offset;
- else
- page_offset = 0;
-
- n = to_read;
-
- if (len >= to_read) {
- len -= to_read;
- } else if (len > 0) {
- /* enough for partial page, fill and zero the rest */
- zero_user(page, len + page_offset, to_read - len);
- n = rdata->tailsz = len;
- len = 0;
- } else if (page->index > eof_index) {
- /*
- * The VFS will not try to do readahead past the
- * i_size, but it's possible that we have outstanding
- * writes with gaps in the middle and the i_size hasn't
- * caught up yet. Populate those with zeroed out pages
- * to prevent the VFS from repeatedly attempting to
- * fill them until the writes are flushed.
- */
- zero_user(page, 0, PAGE_SIZE);
- flush_dcache_page(page);
- SetPageUptodate(page);
- unlock_page(page);
- put_page(page);
- rdata->pages[i] = NULL;
- rdata->nr_pages--;
- continue;
- } else {
- /* no need to hold page hostage */
- unlock_page(page);
- put_page(page);
- rdata->pages[i] = NULL;
- rdata->nr_pages--;
- continue;
- }
+ struct cifs_readdata *rdata = container_of(work,
+ struct cifs_readdata, work);
+ struct folio *folio;
+ pgoff_t last;
+ bool good = rdata->result == 0 || (rdata->result == -EAGAIN && rdata->got_bytes);
- if (iter)
- result = copy_page_from_iter(
- page, page_offset, n, iter);
-#ifdef CONFIG_CIFS_SMB_DIRECT
- else if (rdata->mr)
- result = n;
-#endif
- else
- result = cifs_read_page_from_socket(
- server, page, page_offset, n);
- if (result < 0)
- break;
+ XA_STATE(xas, &rdata->mapping->i_pages, rdata->offset / PAGE_SIZE);
- rdata->got_bytes += result;
- }
+ if (good)
+ cifs_readahead_to_fscache(rdata->mapping->host,
+ rdata->offset, rdata->bytes);
- return rdata->got_bytes > 0 && result != -ECONNABORTED ?
- rdata->got_bytes : result;
-}
+ if (iov_iter_count(&rdata->iter) > 0)
+ iov_iter_zero(iov_iter_count(&rdata->iter), &rdata->iter);
-static int
-cifs_readpages_read_into_pages(struct TCP_Server_Info *server,
- struct cifs_readdata *rdata, unsigned int len)
-{
- return readpages_fill_pages(server, rdata, NULL, len);
-}
+ last = (rdata->offset + rdata->bytes - 1) / PAGE_SIZE;
-static int
-cifs_readpages_copy_into_pages(struct TCP_Server_Info *server,
- struct cifs_readdata *rdata,
- struct iov_iter *iter)
-{
- return readpages_fill_pages(server, rdata, iter, iter->count);
+ rcu_read_lock();
+ xas_for_each(&xas, folio, last) {
+ if (good) {
+ flush_dcache_folio(folio);
+ folio_mark_uptodate(folio);
+ }
+ folio_unlock(folio);
+ }
+ rcu_read_unlock();
+
+ kref_put(&rdata->refcount, cifs_readdata_release);
}
static void cifs_readahead(struct readahead_control *ractl)
{
- int rc;
struct cifsFileInfo *open_file = ractl->file->private_data;
struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(ractl->file);
struct TCP_Server_Info *server;
- pid_t pid;
- unsigned int xid, nr_pages, last_batch_size = 0, cache_nr_pages = 0;
- pgoff_t next_cached = ULONG_MAX;
+ unsigned int xid, nr_pages, cache_nr_pages = 0;
+ unsigned int ra_pages;
+ pgoff_t next_cached = ULONG_MAX, ra_index;
bool caching = fscache_cookie_enabled(cifs_inode_cookie(ractl->mapping->host)) &&
cifs_inode_cookie(ractl->mapping->host)->cache_priv;
bool check_cache = caching;
+ pid_t pid;
+ int rc = 0;
+
+ /* Note that readahead_count() lags behind our dequeuing of pages from
+ * the ractl, wo we have to keep track for ourselves.
+ */
+ ra_pages = readahead_count(ractl);
+ ra_index = readahead_index(ractl);
xid = get_xid();
else
pid = current->tgid;
- rc = 0;
server = cifs_pick_channel(tlink_tcon(open_file->tlink)->ses);
cifs_dbg(FYI, "%s: file=%p mapping=%p num_pages=%u\n",
- __func__, ractl->file, ractl->mapping, readahead_count(ractl));
+ __func__, ractl->file, ractl->mapping, ra_pages);
/*
* Chop the readahead request up into rsize-sized read requests.
*/
- while ((nr_pages = readahead_count(ractl) - last_batch_size)) {
- unsigned int i, got, rsize;
- struct page *page;
+ while ((nr_pages = ra_pages)) {
+ unsigned int i, rsize;
struct cifs_readdata *rdata;
struct cifs_credits credits_on_stack;
struct cifs_credits *credits = &credits_on_stack;
- pgoff_t index = readahead_index(ractl) + last_batch_size;
+ struct folio *folio;
+ pgoff_t fsize;
/*
* Find out if we have anything cached in the range of
if (caching) {
if (check_cache) {
rc = cifs_fscache_query_occupancy(
- ractl->mapping->host, index, nr_pages,
+ ractl->mapping->host, ra_index, nr_pages,
&next_cached, &cache_nr_pages);
if (rc < 0)
caching = false;
check_cache = false;
}
- if (index == next_cached) {
+ if (ra_index == next_cached) {
/*
* TODO: Send a whole batch of pages to be read
* by the cache.
*/
- struct folio *folio = readahead_folio(ractl);
-
- last_batch_size = folio_nr_pages(folio);
+ folio = readahead_folio(ractl);
+ fsize = folio_nr_pages(folio);
+ ra_pages -= fsize;
+ ra_index += fsize;
if (cifs_readpage_from_fscache(ractl->mapping->host,
&folio->page) < 0) {
/*
caching = false;
}
folio_unlock(folio);
- next_cached++;
- cache_nr_pages--;
+ next_cached += fsize;
+ cache_nr_pages -= fsize;
if (cache_nr_pages == 0)
check_cache = true;
continue;
&rsize, credits);
if (rc)
break;
- nr_pages = min_t(size_t, rsize / PAGE_SIZE, readahead_count(ractl));
- nr_pages = min_t(size_t, nr_pages, next_cached - index);
+ nr_pages = min_t(size_t, rsize / PAGE_SIZE, ra_pages);
+ if (next_cached != ULONG_MAX)
+ nr_pages = min_t(size_t, nr_pages, next_cached - ra_index);
/*
* Give up immediately if rsize is too small to read an entire
break;
}
- rdata = cifs_readdata_alloc(nr_pages, cifs_readv_complete);
+ rdata = cifs_readdata_alloc(cifs_readahead_complete);
if (!rdata) {
/* best to give up if we're out of mem */
add_credits_and_wake_if(server, credits, 0);
break;
}
- got = __readahead_batch(ractl, rdata->pages, nr_pages);
- if (got != nr_pages) {
- pr_warn("__readahead_batch() returned %u/%u\n",
- got, nr_pages);
- nr_pages = got;
- }
-
- rdata->nr_pages = nr_pages;
- rdata->bytes = readahead_batch_length(ractl);
+ rdata->offset = ra_index * PAGE_SIZE;
+ rdata->bytes = nr_pages * PAGE_SIZE;
rdata->cfile = cifsFileInfo_get(open_file);
rdata->server = server;
rdata->mapping = ractl->mapping;
- rdata->offset = readahead_pos(ractl);
rdata->pid = pid;
- rdata->pagesz = PAGE_SIZE;
- rdata->tailsz = PAGE_SIZE;
- rdata->read_into_pages = cifs_readpages_read_into_pages;
- rdata->copy_into_pages = cifs_readpages_copy_into_pages;
rdata->credits = credits_on_stack;
+ for (i = 0; i < nr_pages; i++) {
+ if (!readahead_folio(ractl))
+ WARN_ON(1);
+ }
+ ra_pages -= nr_pages;
+ ra_index += nr_pages;
+
+ iov_iter_xarray(&rdata->iter, ITER_DEST, &rdata->mapping->i_pages,
+ rdata->offset, rdata->bytes);
+
rc = adjust_credits(server, &rdata->credits, rdata->bytes);
if (!rc) {
if (rdata->cfile->invalidHandle)
if (rc) {
add_credits_and_wake_if(server, &rdata->credits, 0);
- for (i = 0; i < rdata->nr_pages; i++) {
- page = rdata->pages[i];
- unlock_page(page);
- put_page(page);
- }
+ cifs_unlock_folios(rdata->mapping,
+ rdata->offset / PAGE_SIZE,
+ (rdata->offset + rdata->bytes - 1) / PAGE_SIZE);
/* Fallback to the readpage in error/reconnect cases */
kref_put(&rdata->refcount, cifs_readdata_release);
break;
}
kref_put(&rdata->refcount, cifs_readdata_release);
- last_batch_size = nr_pages;
}
free_xid(xid);
flush_dcache_page(page);
SetPageUptodate(page);
-
- /* send this page to the cache */
- cifs_readpage_to_fscache(file_inode(file), page);
-
rc = 0;
io_error:
.launder_folio = cifs_launder_folio,
.migrate_folio = filemap_migrate_folio,
};
+
+/*
+ * Splice data from a file into a pipe.
+ */
+ssize_t cifs_splice_read(struct file *in, loff_t *ppos,
+ struct pipe_inode_info *pipe, size_t len,
+ unsigned int flags)
+{
+ if (unlikely(*ppos >= file_inode(in)->i_sb->s_maxbytes))
+ return 0;
+ if (unlikely(!len))
+ return 0;
+ if (in->f_flags & O_DIRECT)
+ return direct_splice_read(in, ppos, pipe, len, flags);
+ return filemap_splice_read(in, ppos, pipe, len, flags);
+}
projects / linux.git / blobdiff