ceph: mark user pages dirty on direct-io reads

For read operation, we have to set the argument _write_ of get_user_pages
to 1 since we will write data to pages. Also, we need to SetPageDirty before
releasing these pages.

Signed-off-by: Henry C Chang <henry_c_chang@tcloudcomputing.com>
Signed-off-by: Sage Weil <sage@newdream.net>

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index e860d8f..7d0e4a8 100644 (file)
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -384,7 +384,7 @@ static ssize_t ceph_sync_read(struct file *file, char __user *data,
 
        if (file->f_flags & O_DIRECT) {
                num_pages = calc_pages_for((unsigned long)data, len);
-               pages = ceph_get_direct_page_vector(data, num_pages);
+               pages = ceph_get_direct_page_vector(data, num_pages, true);
        } else {
                num_pages = calc_pages_for(off, len);
                pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
@@ -413,7 +413,7 @@ static ssize_t ceph_sync_read(struct file *file, char __user *data,
 
 done:
        if (file->f_flags & O_DIRECT)
-               ceph_put_page_vector(pages, num_pages);
+               ceph_put_page_vector(pages, num_pages, true);
        else
                ceph_release_page_vector(pages, num_pages);
        dout("sync_read result %d\n", ret);
@@ -522,7 +522,7 @@ more:
                return -ENOMEM;
 
        if (file->f_flags & O_DIRECT) {
-               pages = ceph_get_direct_page_vector(data, num_pages);
+               pages = ceph_get_direct_page_vector(data, num_pages, false);
                if (IS_ERR(pages)) {
                        ret = PTR_ERR(pages);
                        goto out;
@@ -572,7 +572,7 @@ more:
        }
 
        if (file->f_flags & O_DIRECT)
-               ceph_put_page_vector(pages, num_pages);
+               ceph_put_page_vector(pages, num_pages, false);
        else if (file->f_flags & O_SYNC)
                ceph_release_page_vector(pages, num_pages);
 

diff --git a/include/linux/ceph/libceph.h b/include/linux/ceph/libceph.h
index 9e76d35..72c72bf 100644 (file)
--- a/include/linux/ceph/libceph.h
+++ b/include/linux/ceph/libceph.h
@@ -227,8 +227,10 @@ extern int ceph_open_session(struct ceph_client *client);
 extern void ceph_release_page_vector(struct page **pages, int num_pages);
 
 extern struct page **ceph_get_direct_page_vector(const char __user *data,
-                                                int num_pages);
-extern void ceph_put_page_vector(struct page **pages, int num_pages);
+                                                int num_pages,
+                                                bool write_page);
+extern void ceph_put_page_vector(struct page **pages, int num_pages,
+                                bool dirty);
 extern void ceph_release_page_vector(struct page **pages, int num_pages);
 extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
 extern int ceph_copy_user_to_page_vector(struct page **pages,

diff --git a/net/ceph/pagevec.c b/net/ceph/pagevec.c
index ac34fee..01947a5 100644 (file)
--- a/net/ceph/pagevec.c
+++ b/net/ceph/pagevec.c
@@ -13,7 +13,7 @@
  * build a vector of user pages
  */
 struct page **ceph_get_direct_page_vector(const char __user *data,
-                                         int num_pages)
+                                         int num_pages, bool write_page)
 {
        struct page **pages;
        int rc;
@@ -24,7 +24,7 @@ struct page **ceph_get_direct_page_vector(const char __user *data,
 
        down_read(&current->mm->mmap_sem);
        rc = get_user_pages(current, current->mm, (unsigned long)data,
-                           num_pages, 0, 0, pages, NULL);
+                           num_pages, write_page, 0, pages, NULL);
        up_read(&current->mm->mmap_sem);
        if (rc < 0)
                goto fail;
@@ -36,12 +36,15 @@ fail:
 }
 EXPORT_SYMBOL(ceph_get_direct_page_vector);
 
-void ceph_put_page_vector(struct page **pages, int num_pages)
+void ceph_put_page_vector(struct page **pages, int num_pages, bool dirty)
 {
        int i;
 
-       for (i = 0; i < num_pages; i++)
+       for (i = 0; i < num_pages; i++) {
+               if (dirty)
+                       set_page_dirty_lock(pages[i]);
                put_page(pages[i]);
+       }
        kfree(pages);
 }
 EXPORT_SYMBOL(ceph_put_page_vector);