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ceph: invalidate pages that beyond EOF in ceph_writepages_start() 

Dirty pages can be associated with different capsnap. Different capsnap
may have different EOF value. So invalidating dirty pages according to
the largest EOF value is wrong. Dirty pages beyond EOF, but associated
with other capsnap, do not get invalidated.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Yan, Zheng 2018-03-04 16:36:01 +08:00 committed by Ilya Dryomov
parent bc4b5ad3a6
commit af9cc401ce
2 changed files with 18 additions and 29 deletions
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36
fs/ceph/addr.c
View File

@ -801,7 +801,7 @@ static int ceph_writepages_start(struct address_space *mapping,
struct ceph_osd_request *req = NULL;
struct ceph_writeback_ctl ceph_wbc;
bool should_loop, range_whole = false;
bool stop, done = false;
bool done = false;
dout("writepages_start %p (mode=%s)\n", inode,
wbc->sync_mode == WB_SYNC_NONE ? "NONE" :
@ -865,8 +865,7 @@ retry:
ceph_put_snap_context(last_snapc);
last_snapc = snapc;
stop = false;
while (!stop && index <= end) {
while (!done && index <= end) {
int num_ops = 0, op_idx;
unsigned i, pvec_pages, max_pages, locked_pages = 0;
struct page **pages = NULL, **data_pages;
@ -899,16 +898,26 @@ get_more_pages:
unlock_page(page);
continue;
}
if (strip_unit_end && (page->index > strip_unit_end)) {
dout("end of strip unit %p\n", page);
/* only if matching snap context */
pgsnapc = page_snap_context(page);
if (pgsnapc != snapc) {
dout("page snapc %p %lld != oldest %p %lld\n",
pgsnapc, pgsnapc->seq, snapc, snapc->seq);
unlock_page(page);
break;
continue;
}
if (page_offset(page) >= ceph_wbc.i_size) {
dout("%p page eof %llu\n",
page, ceph_wbc.i_size);
/* not done if range_cyclic */
stop = true;
if (ceph_wbc.size_stable ||
page_offset(page) >= i_size_read(inode))
mapping->a_ops->invalidatepage(page,
0, PAGE_SIZE);
unlock_page(page);
continue;
}
if (strip_unit_end && (page->index > strip_unit_end)) {
dout("end of strip unit %p\n", page);
unlock_page(page);
break;
}
@ -922,15 +931,6 @@ get_more_pages:
wait_on_page_writeback(page);
}
/* only if matching snap context */
pgsnapc = page_snap_context(page);
if (pgsnapc != snapc) {
dout("page snapc %p %lld != oldest %p %lld\n",
pgsnapc, pgsnapc->seq, snapc, snapc->seq);
unlock_page(page);
continue;
}
if (!clear_page_dirty_for_io(page)) {
dout("%p !clear_page_dirty_for_io\n", page);
unlock_page(page);
@ -1143,7 +1143,7 @@ new_request:
* we tagged for writeback prior to entering this loop.
*/
if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE)
done = stop = true;
done = true;
release_pvec_pages:
dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr,

11
fs/ceph/inode.c
View File

@ -1867,20 +1867,9 @@ retry:
* possibly truncate them.. so write AND block!
*/
if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
struct ceph_cap_snap *capsnap;
to = ci->i_truncate_size;
list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
// MDS should have revoked Frw caps
WARN_ON_ONCE(capsnap->writing);
if (capsnap->dirty_pages && capsnap->size > to)
to = capsnap->size;
}
spin_unlock(&ci->i_ceph_lock);
dout("__do_pending_vmtruncate %p flushing snaps first\n",
inode);
truncate_pagecache(inode, to);
filemap_write_and_wait_range(&inode->i_data, 0,
inode->i_sb->s_maxbytes);
goto retry;