@@ -463,14 +463,20 @@ static int ceph_readpages(struct file *file, struct address_space *mapping,
return rc;
}
+struct ceph_writeback_ctl
+{
+ loff_t i_size;
+ u64 truncate_size;
+ u32 truncate_seq;
+ bool size_stable;
+};
+
/*
* Get ref for the oldest snapc for an inode with dirty data... that is, the
* only snap context we are allowed to write back.
*/
-static struct ceph_snap_context *get_oldest_context(struct inode *inode,
- loff_t *snap_size,
- u64 *truncate_size,
- u32 *truncate_seq)
+static struct ceph_snap_context *
+get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_snap_context *snapc = NULL;
@@ -482,12 +488,17 @@ static struct ceph_snap_context *get_oldest_context(struct inode *inode,
capsnap->context, capsnap->dirty_pages);
if (capsnap->dirty_pages) {
snapc = ceph_get_snap_context(capsnap->context);
- if (snap_size)
- *snap_size = capsnap->size;
- if (truncate_size)
- *truncate_size = capsnap->truncate_size;
- if (truncate_seq)
- *truncate_seq = capsnap->truncate_seq;
+ 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;
+ }
break;
}
}
@@ -495,15 +506,44 @@ static struct ceph_snap_context *get_oldest_context(struct inode *inode,
snapc = ceph_get_snap_context(ci->i_head_snapc);
dout(" head snapc %p has %d dirty pages\n",
snapc, ci->i_wrbuffer_ref_head);
- if (truncate_size)
- *truncate_size = ci->i_truncate_size;
- if (truncate_seq)
- *truncate_seq = ci->i_truncate_seq;
+ if (ctl) {
+ ctl->i_size = i_size_read(inode);
+ ctl->truncate_size = ci->i_truncate_size;
+ ctl->truncate_seq = ci->i_truncate_seq;
+ ctl->size_stable = false;
+ }
}
spin_unlock(&ci->i_ceph_lock);
return snapc;
}
+static u64 get_writepages_data_length(struct inode *inode,
+ struct page *page, u64 start)
+{
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ struct ceph_snap_context *snapc = page_snap_context(page);
+ struct ceph_cap_snap *capsnap = NULL;
+ u64 end = i_size_read(inode);
+
+ if (snapc != ci->i_head_snapc) {
+ bool found = false;
+ spin_lock(&ci->i_ceph_lock);
+ list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
+ if (capsnap->context == snapc) {
+ if (!capsnap->writing)
+ end = capsnap->size;
+ found = true;
+ break;
+ }
+ }
+ spin_unlock(&ci->i_ceph_lock);
+ WARN_ON(!found);
+ }
+ if (end > page_offset(page) + PAGE_SIZE)
+ end = page_offset(page) + PAGE_SIZE;
+ return end > start ? end - start : 0;
+}
+
/*
* Write a single page, but leave the page locked.
*
@@ -515,21 +555,17 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
struct inode *inode;
struct ceph_inode_info *ci;
struct ceph_fs_client *fsc;
- struct ceph_osd_client *osdc;
struct ceph_snap_context *snapc, *oldest;
loff_t page_off = page_offset(page);
- loff_t snap_size = -1;
long writeback_stat;
- u64 truncate_size;
- u32 truncate_seq;
int err, len = PAGE_SIZE;
+ struct ceph_writeback_ctl ceph_wbc;
dout("writepage %p idx %lu\n", page, page->index);
inode = page->mapping->host;
ci = ceph_inode(inode);
fsc = ceph_inode_to_client(inode);
- osdc = &fsc->client->osdc;
/* verify this is a writeable snap context */
snapc = page_snap_context(page);
@@ -537,8 +573,7 @@ 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, &snap_size,
- &truncate_size, &truncate_seq);
+ oldest = get_oldest_context(inode, &ceph_wbc);
if (snapc->seq > oldest->seq) {
dout("writepage %p page %p snapc %p not writeable - noop\n",
inode, page, snapc);
@@ -550,17 +585,14 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
}
ceph_put_snap_context(oldest);
- if (snap_size == -1)
- snap_size = i_size_read(inode);
-
/* is this a partial page at end of file? */
- if (page_off >= snap_size) {
- dout("%p page eof %llu\n", page, snap_size);
+ if (page_off >= ceph_wbc.i_size) {
+ dout("%p page eof %llu\n", page, ceph_wbc.i_size);
return 0;
}
- if (snap_size < page_off + len)
- len = snap_size - page_off;
+ if (ceph_wbc.i_size < page_off + len)
+ len = ceph_wbc.i_size - page_off;
dout("writepage %p page %p index %lu on %llu~%u snapc %p seq %lld\n",
inode, page, page->index, page_off, len, snapc, snapc->seq);
@@ -571,10 +603,10 @@ static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC);
set_page_writeback(page);
- err = ceph_osdc_writepages(osdc, ceph_vino(inode),
- &ci->i_layout, snapc,
- page_off, len,
- truncate_seq, truncate_size,
+ err = ceph_osdc_writepages(&fsc->client->osdc, ceph_vino(inode),
+ &ci->i_layout, snapc, page_off, len,
+ ceph_wbc.truncate_seq,
+ ceph_wbc.truncate_size,
&inode->i_mtime, &page, 1);
if (err < 0) {
struct writeback_control tmp_wbc;
@@ -745,9 +777,7 @@ static int ceph_writepages_start(struct address_space *mapping,
int rc = 0;
unsigned int wsize = i_blocksize(inode);
struct ceph_osd_request *req = NULL;
- loff_t snap_size, i_size;
- u64 truncate_size;
- u32 truncate_seq;
+ struct ceph_writeback_ctl ceph_wbc;
dout("writepages_start %p (mode=%s)\n", inode,
wbc->sync_mode == WB_SYNC_NONE ? "NONE" :
@@ -786,9 +816,7 @@ static int ceph_writepages_start(struct address_space *mapping,
retry:
/* find oldest snap context with dirty data */
ceph_put_snap_context(snapc);
- snap_size = -1;
- snapc = get_oldest_context(inode, &snap_size,
- &truncate_size, &truncate_seq);
+ snapc = get_oldest_context(inode, &ceph_wbc);
if (!snapc) {
/* hmm, why does writepages get called when there
is no dirty data? */
@@ -798,8 +826,6 @@ static int ceph_writepages_start(struct address_space *mapping,
dout(" oldest snapc is %p seq %lld (%d snaps)\n",
snapc, snapc->seq, snapc->num_snaps);
- i_size = i_size_read(inode);
-
if (last_snapc && snapc != last_snapc) {
/* if we switched to a newer snapc, restart our scan at the
* start of the original file range. */
@@ -865,10 +891,9 @@ static int ceph_writepages_start(struct address_space *mapping,
dout("waiting on writeback %p\n", page);
wait_on_page_writeback(page);
}
- if (page_offset(page) >=
- (snap_size == -1 ? i_size : snap_size)) {
- dout("%p page eof %llu\n", page,
- (snap_size == -1 ? i_size : snap_size));
+ if (page_offset(page) >= ceph_wbc.i_size) {
+ dout("%p page eof %llu\n",
+ page, ceph_wbc.i_size);
done = 1;
unlock_page(page);
break;
@@ -996,10 +1021,9 @@ static int ceph_writepages_start(struct address_space *mapping,
req = ceph_osdc_new_request(&fsc->client->osdc,
&ci->i_layout, vino,
offset, &len, 0, num_ops,
- CEPH_OSD_OP_WRITE,
- CEPH_OSD_FLAG_WRITE,
- snapc, truncate_seq,
- truncate_size, false);
+ CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
+ snapc, ceph_wbc.truncate_seq,
+ ceph_wbc.truncate_size, false);
if (IS_ERR(req)) {
req = ceph_osdc_new_request(&fsc->client->osdc,
&ci->i_layout, vino,
@@ -1008,8 +1032,8 @@ static int ceph_writepages_start(struct address_space *mapping,
CEPH_OSD_SLAB_OPS),
CEPH_OSD_OP_WRITE,
CEPH_OSD_FLAG_WRITE,
- snapc, truncate_seq,
- truncate_size, true);
+ snapc, ceph_wbc.truncate_seq,
+ ceph_wbc.truncate_size, true);
BUG_ON(IS_ERR(req));
}
BUG_ON(len < page_offset(pages[locked_pages - 1]) +
@@ -1046,14 +1070,15 @@ static int ceph_writepages_start(struct address_space *mapping,
len += PAGE_SIZE;
}
- if (snap_size != -1) {
- len = min(len, snap_size - offset);
+ if (ceph_wbc.size_stable) {
+ len = min(len, ceph_wbc.i_size - offset);
} else if (i == locked_pages) {
/* writepages_finish() clears writeback pages
* according to the data length, so make sure
* data length covers all locked pages */
u64 min_len = len + 1 - PAGE_SIZE;
- len = min(len, (u64)i_size_read(inode) - offset);
+ len = get_writepages_data_length(inode, pages[i - 1],
+ offset);
len = max(len, min_len);
}
dout("writepages got pages at %llu~%llu\n", offset, len);
@@ -1137,8 +1162,7 @@ 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,
- NULL, NULL);
+ struct ceph_snap_context *oldest = get_oldest_context(inode, NULL);
int ret = !oldest || snapc->seq <= oldest->seq;
ceph_put_snap_context(oldest);
@@ -1183,8 +1207,7 @@ 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, NULL, NULL);
-
+ oldest = get_oldest_context(inode, NULL);
if (snapc->seq > oldest->seq) {
ceph_put_snap_context(oldest);
dout(" page %p snapc %p not current or oldest\n",
capsnap's size is set by __ceph_finish_cap_snap(). If capsnap is under writing, its size is zero. In this case, get_oldest_context() should read i_size. Besides, ceph_writepages_start() should re-check capsnap's size after dirty pages get locked. Signed-off-by: "Yan, Zheng" <zyan@redhat.com> --- fs/ceph/addr.c | 137 +++++++++++++++++++++++++++++++++------------------------ 1 file changed, 80 insertions(+), 57 deletions(-)