@@ -476,7 +476,8 @@ struct ceph_writeback_ctl
* only snap context we are allowed to write back.
*/
static struct ceph_snap_context *
-get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl)
+get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl,
+ struct ceph_snap_context *page_snapc)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_snap_context *snapc = NULL;
@@ -486,21 +487,33 @@ get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl)
list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap,
capsnap->context, capsnap->dirty_pages);
- if (capsnap->dirty_pages) {
- snapc = ceph_get_snap_context(capsnap->context);
- if (ctl) {
- if (capsnap->writing) {
- ctl->i_size = i_size_read(inode);
- ctl->size_stable = false;
- } else {
- ctl->i_size = capsnap->size;
- ctl->size_stable = true;
- }
- ctl->truncate_size = capsnap->truncate_size;
- ctl->truncate_seq = capsnap->truncate_seq;
+ if (!capsnap->dirty_pages)
+ continue;
+
+ /* get i_size, truncate_{seq,size} for page_snapc? */
+ if (snapc && capsnap->context != page_snapc)
+ continue;
+
+ if (ctl) {
+ if (capsnap->writing) {
+ ctl->i_size = i_size_read(inode);
+ ctl->size_stable = false;
+ } else {
+ ctl->i_size = capsnap->size;
+ ctl->size_stable = true;
}
- break;
+ ctl->truncate_size = capsnap->truncate_size;
+ ctl->truncate_seq = capsnap->truncate_seq;
}
+
+ if (snapc)
+ break;
+
+ snapc = ceph_get_snap_context(capsnap->context);
+ if (!page_snapc ||
+ page_snapc == snapc ||
+ page_snapc->seq > snapc->seq)
+ break;
}
if (!snapc && ci->i_wrbuffer_ref_head) {
snapc = ceph_get_snap_context(ci->i_head_snapc);
@@ -573,7 +586,7 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
dout("writepage %p page %p not dirty?\n", inode, page);
return 0;
}
- oldest = get_oldest_context(inode, &ceph_wbc);
+ oldest = get_oldest_context(inode, &ceph_wbc, snapc);
if (snapc->seq > oldest->seq) {
dout("writepage %p page %p snapc %p not writeable - noop\n",
inode, page, snapc);
@@ -588,6 +601,7 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
/* is this a partial page at end of file? */
if (page_off >= ceph_wbc.i_size) {
dout("%p page eof %llu\n", page, ceph_wbc.i_size);
+ page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE);
return 0;
}
@@ -816,7 +830,7 @@ static int ceph_writepages_start(struct address_space *mapping,
retry:
/* find oldest snap context with dirty data */
ceph_put_snap_context(snapc);
- snapc = get_oldest_context(inode, &ceph_wbc);
+ snapc = get_oldest_context(inode, &ceph_wbc, NULL);
if (!snapc) {
/* hmm, why does writepages get called when there
is no dirty data? */
@@ -1162,7 +1176,7 @@ static int ceph_writepages_start(struct address_space *mapping,
static int context_is_writeable_or_written(struct inode *inode,
struct ceph_snap_context *snapc)
{
- struct ceph_snap_context *oldest = get_oldest_context(inode, NULL);
+ struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL);
int ret = !oldest || snapc->seq <= oldest->seq;
ceph_put_snap_context(oldest);
@@ -1207,7 +1221,7 @@ static int ceph_update_writeable_page(struct file *file,
* this page is already dirty in another (older) snap
* context! is it writeable now?
*/
- oldest = get_oldest_context(inode, NULL);
+ oldest = get_oldest_context(inode, NULL, NULL);
if (snapc->seq > oldest->seq) {
ceph_put_snap_context(oldest);
dout(" page %p snapc %p not current or oldest\n",
Otherwise, the page left in state that page is assocated with a snapc, but (PageDirty(page) || PageWriteback(page)) is false. Signed-off-by: "Yan, Zheng" <zyan@redhat.com> --- fs/ceph/addr.c | 50 ++++++++++++++++++++++++++++++++------------------ 1 file changed, 32 insertions(+), 18 deletions(-)