Btrfs: Hold csum mutex while reading in sums during readpages

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

diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index a5ff19b..70af24a 100644 (file)
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -150,7 +150,6 @@ int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
        struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
 
        path = btrfs_alloc_path();
-       path->reada = 2;
 
        WARN_ON(bio->bi_vcnt <= 0);
 
@@ -177,6 +176,7 @@ int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
                                printk("no csum found for inode %lu start "
                                       "%llu\n", inode->i_ino,
                                       (unsigned long long)offset);
+                               item = NULL;
                                goto found;
                        }
                        btrfs_item_key_to_cpu(path->nodes[0], &found_key,

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 76365ad..640648c 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -376,7 +376,9 @@ int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
        if (!(rw & (1 << BIO_RW))) {
                if (!btrfs_test_opt(root, NODATASUM) &&
                    !btrfs_test_flag(inode, NODATASUM)) {
+                       mutex_lock(&BTRFS_I(inode)->csum_mutex);
                        btrfs_lookup_bio_sums(root, inode, bio);
+                       mutex_unlock(&BTRFS_I(inode)->csum_mutex);
                }
                goto mapit;
        }