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CIFS: Optimize readpages in a short read case on reconnects 

by marking pages with a data from a partially received response up-to-date.
This is suitable for non-signed connections.

Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Pavel Shilovsky 2014-07-10 11:31:53 +04:00 committed by Steve French
parent d913ed17f0
commit b770ddfa26
1 changed files with 8 additions and 3 deletions
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11
fs/cifs/file.c
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@ -3281,25 +3281,30 @@ int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
static void static void
cifs_readv_complete(struct work_struct *work) cifs_readv_complete(struct work_struct *work)
{ {
unsigned int i; unsigned int i, got_bytes;
struct cifs_readdata *rdata = container_of(work, struct cifs_readdata *rdata = container_of(work,
struct cifs_readdata, work); struct cifs_readdata, work);
got_bytes = rdata->got_bytes;
for (i = 0; i < rdata->nr_pages; i++) { for (i = 0; i < rdata->nr_pages; i++) {
struct page *page = rdata->pages[i]; struct page *page = rdata->pages[i];
lru_cache_add_file(page); lru_cache_add_file(page);
if (rdata->result == 0) { if (rdata->result == 0 ||
(rdata->result == -EAGAIN && got_bytes)) {
flush_dcache_page(page); flush_dcache_page(page);
SetPageUptodate(page); SetPageUptodate(page);
} }
unlock_page(page); unlock_page(page);
if (rdata->result == 0) if (rdata->result == 0 ||
(rdata->result == -EAGAIN && got_bytes))
cifs_readpage_to_fscache(rdata->mapping->host, page); cifs_readpage_to_fscache(rdata->mapping->host, page);
got_bytes -= min_t(unsigned int, PAGE_CACHE_SIZE, got_bytes);
page_cache_release(page); page_cache_release(page);
rdata->pages[i] = NULL; rdata->pages[i] = NULL;
} }