Btrfs: check return value of btrfs_alloc_path()

Adding the check on the return value of btrfs_alloc_path() to several places.
And, some of callers are modified by this change.

Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 992a4b9..41d1d7c 100644 (file)
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -663,8 +663,9 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
                        atomic_inc(&cb->pending_bios);
 
                        if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) {
-                               btrfs_lookup_bio_sums(root, inode, comp_bio,
-                                                     sums);
+                               ret = btrfs_lookup_bio_sums(root, inode,
+                                                       comp_bio, sums);
+                               BUG_ON(ret);
                        }
                        sums += (comp_bio->bi_size + root->sectorsize - 1) /
                                root->sectorsize;
@@ -689,8 +690,10 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
        ret = btrfs_bio_wq_end_io(root->fs_info, comp_bio, 0);
        BUG_ON(ret);
 
-       if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM))
-               btrfs_lookup_bio_sums(root, inode, comp_bio, sums);
+       if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) {
+               ret = btrfs_lookup_bio_sums(root, inode, comp_bio, sums);
+               BUG_ON(ret);
+       }
 
        ret = btrfs_map_bio(root, READ, comp_bio, mirror_num, 0);
        BUG_ON(ret);

diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index 02c97ad..c62f02f 100644 (file)
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -151,7 +151,7 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
                ret = PTR_ERR(dir_item);
                if (ret == -EEXIST)
                        goto second_insert;
-               goto out;
+               goto out_free;
        }
 
        leaf = path->nodes[0];
@@ -170,7 +170,7 @@ second_insert:
        /* FIXME, use some real flag for selecting the extra index */
        if (root == root->fs_info->tree_root) {
                ret = 0;
-               goto out;
+               goto out_free;
        }
        btrfs_release_path(root, path);
 
@@ -180,7 +180,7 @@ second_insert:
                                        name, name_len);
        if (IS_ERR(dir_item)) {
                ret2 = PTR_ERR(dir_item);
-               goto out;
+               goto out_free;
        }
        leaf = path->nodes[0];
        btrfs_cpu_key_to_disk(&disk_key, location);
@@ -192,7 +192,9 @@ second_insert:
        name_ptr = (unsigned long)(dir_item + 1);
        write_extent_buffer(leaf, name, name_ptr, name_len);
        btrfs_mark_buffer_dirty(leaf);
-out:
+
+out_free:
+
        btrfs_free_path(path);
        if (ret)
                return ret;

diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index a213419..a6a9d4e 100644 (file)
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -170,6 +170,8 @@ static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
        struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
 
        path = btrfs_alloc_path();
+       if (!path)
+               return -ENOMEM;
        if (bio->bi_size > PAGE_CACHE_SIZE * 8)
                path->reada = 2;
 

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index f739b25..04e9fff 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1467,8 +1467,11 @@ static int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
                if (bio_flags & EXTENT_BIO_COMPRESSED) {
                        return btrfs_submit_compressed_read(inode, bio,
                                                    mirror_num, bio_flags);
-               } else if (!skip_sum)
-                       btrfs_lookup_bio_sums(root, inode, bio, NULL);
+               } else if (!skip_sum) {
+                       ret = btrfs_lookup_bio_sums(root, inode, bio, NULL);
+                       if (ret)
+                               return ret;
+               }
                goto mapit;
        } else if (!skip_sum) {
                /* csum items have already been cloned */
@@ -1903,10 +1906,10 @@ static int btrfs_io_failed_hook(struct bio *failed_bio,
        else
                rw = READ;
 
-       BTRFS_I(inode)->io_tree.ops->submit_bio_hook(inode, rw, bio,
+       ret = BTRFS_I(inode)->io_tree.ops->submit_bio_hook(inode, rw, bio,
                                                      failrec->last_mirror,
                                                      failrec->bio_flags, 0);
-       return 0;
+       return ret;
 }
 
 /*
@@ -5943,9 +5946,12 @@ static inline int __btrfs_submit_dio_bio(struct bio *bio, struct inode *inode,
                                   __btrfs_submit_bio_start_direct_io,
                                   __btrfs_submit_bio_done);
                goto err;
-       } else if (!skip_sum)
-               btrfs_lookup_bio_sums_dio(root, inode, bio,
+       } else if (!skip_sum) {
+               ret = btrfs_lookup_bio_sums_dio(root, inode, bio,
                                          file_offset, csums);
+               if (ret)
+                       goto err;
+       }
 
        ret = btrfs_map_bio(root, rw, bio, 0, 1);
 err: