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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>
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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8
fs/ceph/file.c
View File

@ -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 @@ static ssize_t ceph_sync_write(struct file *file, const char __user *data,
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 @@ static ssize_t ceph_sync_write(struct file *file, const char __user *data,
}
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);

6
include/linux/ceph/libceph.h
View File

@ -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,

11
net/ceph/pagevec.c
View File

@ -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 @@ struct page **ceph_get_direct_page_vector(const char __user *data,
}
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);