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Btrfs: Keep extent mappings in ram until pending ordered extents are done

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It was possible for stale mappings from disk to be used instead of the
new pending ordered extent.  This adds a flag to the extent map struct
to keep it pinned until the pending ordered extent is actually on disk.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-07-18 12:01:11 -04:00
parent 211f90e68b
commit 7f3c74fb83
6 changed files with 48 additions and 20 deletions
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27
fs/btrfs/extent_io.c
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@@ -2000,7 +2000,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
struct block_device *bdev;
int ret;
int nr = 0;
size_t page_offset = 0;
size_t pg_offset = 0;
size_t blocksize;
loff_t i_size = i_size_read(inode);
unsigned long end_index = i_size >> PAGE_CACHE_SHIFT;
@@ -2008,9 +2008,9 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
u64 delalloc_end;
WARN_ON(!PageLocked(page));
page_offset = i_size & (PAGE_CACHE_SIZE - 1);
pg_offset = i_size & (PAGE_CACHE_SIZE - 1);
if (page->index > end_index ||
(page->index == end_index && !page_offset)) {
(page->index == end_index && !pg_offset)) {
page->mapping->a_ops->invalidatepage(page, 0);
unlock_page(page);
return 0;
@@ -2020,12 +2020,12 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
char *userpage;
userpage = kmap_atomic(page, KM_USER0);
memset(userpage + page_offset, 0,
PAGE_CACHE_SIZE - page_offset);
memset(userpage + pg_offset, 0,
PAGE_CACHE_SIZE - pg_offset);
kunmap_atomic(userpage, KM_USER0);
flush_dcache_page(page);
}
page_offset = 0;
pg_offset = 0;
set_page_extent_mapped(page);
@@ -2088,7 +2088,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
unlock_start = page_end + 1;
break;
}
em = epd->get_extent(inode, page, page_offset, cur,
em = epd->get_extent(inode, page, pg_offset, cur,
end - cur + 1, 1);
if (IS_ERR(em) || !em) {
SetPageError(page);
@@ -2113,12 +2113,13 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
unlock_extent(tree, unlock_start, cur + iosize -1,
GFP_NOFS);
if (tree->ops && tree->ops->writepage_end_io_hook)
tree->ops->writepage_end_io_hook(page, cur,
cur + iosize - 1,
NULL, 1);
cur = cur + iosize;
page_offset += iosize;
pg_offset += iosize;
unlock_start = cur;
continue;
}
@@ -2127,7 +2128,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
if (0 && !test_range_bit(tree, cur, cur + iosize - 1,
EXTENT_DIRTY, 0)) {
cur = cur + iosize;
page_offset += iosize;
pg_offset += iosize;
continue;
}
clear_extent_dirty(tree, cur, cur + iosize - 1, GFP_NOFS);
@@ -2141,6 +2142,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
SetPageError(page);
} else {
unsigned long max_nr = end_index + 1;
set_range_writeback(tree, cur, cur + iosize - 1);
if (!PageWriteback(page)) {
printk("warning page %lu not writeback, "
@@ -2150,14 +2152,14 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
}
ret = submit_extent_page(WRITE, tree, page, sector,
iosize, page_offset, bdev,
iosize, pg_offset, bdev,
&epd->bio, max_nr,
end_bio_extent_writepage, 0);
if (ret)
SetPageError(page);
}
cur = cur + iosize;
page_offset += iosize;
pg_offset += iosize;
nr++;
}
done:
@@ -2579,7 +2581,8 @@ int try_release_extent_mapping(struct extent_map_tree *map,
spin_unlock(&map->lock);
break;
}
if (em->start != start) {
if (test_bit(EXTENT_FLAG_PINNED, &em->flags) ||
em->start != start) {
spin_unlock(&map->lock);
free_extent_map(em);
break;