Btrfs: fix page->private races

There is a race where btrfs_releasepage can drop the
page->private contents just as alloc_extent_buffer is setting
up pages for metadata.  Because of how the Btrfs page flags work,
this results in us skipping the crc on the page during IO.

This patch sovles the race by waiting until after the extent buffer
is inserted into the radix tree before it sets page private.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index b36eeef19194ecf384330a2d1e7eda5e552b2a09..3e1ea3e0477e6249435d30286cba7690f6d48874 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -359,10 +359,14 @@ static int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
 
        tree = &BTRFS_I(page->mapping->host)->io_tree;
 
-       if (page->private == EXTENT_PAGE_PRIVATE)
+       if (page->private == EXTENT_PAGE_PRIVATE) {
+               WARN_ON(1);
                goto out;
-       if (!page->private)
+       }
+       if (!page->private) {
+               WARN_ON(1);
                goto out;
+       }
        len = page->private >> 2;
        WARN_ON(len == 0);
 

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 8862dda46ff6ad5984be8519dbc9988a2e881f86..0418bf2c9757f08f15fe897652ee59d2d2534e88 100644 (file)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1946,6 +1946,7 @@ void set_page_extent_mapped(struct page *page)
 
 static void set_page_extent_head(struct page *page, unsigned long len)
 {
+       WARN_ON(!PagePrivate(page));
        set_page_private(page, EXTENT_PAGE_PRIVATE_FIRST_PAGE | len << 2);
 }
 
@@ -3195,7 +3196,13 @@ struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
                }
                if (!PageUptodate(p))
                        uptodate = 0;
-               unlock_page(p);
+
+               /*
+                * see below about how we avoid a nasty race with release page
+                * and why we unlock later
+                */
+               if (i != 0)
+                       unlock_page(p);
        }
        if (uptodate)
                set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
@@ -3219,9 +3226,26 @@ struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
        atomic_inc(&eb->refs);
        spin_unlock(&tree->buffer_lock);
        radix_tree_preload_end();
+
+       /*
+        * there is a race where release page may have
+        * tried to find this extent buffer in the radix
+        * but failed.  It will tell the VM it is safe to
+        * reclaim the, and it will clear the page private bit.
+        * We must make sure to set the page private bit properly
+        * after the extent buffer is in the radix tree so
+        * it doesn't get lost
+        */
+       set_page_extent_mapped(eb->first_page);
+       set_page_extent_head(eb->first_page, eb->len);
+       if (!page0)
+               unlock_page(eb->first_page);
        return eb;
 
 free_eb:
+       if (eb->first_page && !page0)
+               unlock_page(eb->first_page);
+
        if (!atomic_dec_and_test(&eb->refs))
                return exists;
        btrfs_release_extent_buffer(eb);
@@ -3272,10 +3296,11 @@ int clear_extent_buffer_dirty(struct extent_io_tree *tree,
                        continue;
 
                lock_page(page);
+               WARN_ON(!PagePrivate(page));
+
+               set_page_extent_mapped(page);
                if (i == 0)
                        set_page_extent_head(page, eb->len);
-               else
-                       set_page_private(page, EXTENT_PAGE_PRIVATE);
 
                clear_page_dirty_for_io(page);
                spin_lock_irq(&page->mapping->tree_lock);
@@ -3465,6 +3490,13 @@ int read_extent_buffer_pages(struct extent_io_tree *tree,
 
        for (i = start_i; i < num_pages; i++) {
                page = extent_buffer_page(eb, i);
+
+               WARN_ON(!PagePrivate(page));
+
+               set_page_extent_mapped(page);
+               if (i == 0)
+                       set_page_extent_head(page, eb->len);
+
                if (inc_all_pages)
                        page_cache_get(page);
                if (!PageUptodate(page)) {