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ceph: mark user pages dirty on direct-io reads

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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>
This commit is contained in:
Henry C Chang
2010-12-15 20:45:41 -08:00
committed by Sage Weil
parent 92cf765237
commit b6aa5901c7
3 changed files with 15 additions and 10 deletions
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11
net/ceph/pagevec.c
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@ -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);