There are some places that don't check at all btrfs_alloc_path() failures,
I added BUG_ON's for all of them, as many other codepaths that don't know
how to handle the failures seem to do.
In case of not applying this patch, I must notice that there's one real
bugfix that should be applied, it's a null pointer dereference on inode.c:
2506: path = btrfs_alloc_path();
2507: path->reada = -1;
2508: BUG_ON(!path);
Index: btrfs-unstable-standalone/dir-item.c
===================================================================
--- btrfs-unstable-standalone.orig/dir-item.c 2008-12-29 21:23:16.940588725
+0100
+++ btrfs-unstable-standalone/dir-item.c 2008-12-29 21:30:13.654588510
+0100
@@ -146,6 +146,7 @@
btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
key.offset = btrfs_name_hash(name, name_len);
path = btrfs_alloc_path();
+ BUG_ON(!path);
data_size = sizeof(*dir_item) + name_len;
dir_item = insert_with_overflow(trans, root, path, &key, data_size,
name, name_len);
Index: btrfs-unstable-standalone/export.c
===================================================================
--- btrfs-unstable-standalone.orig/export.c 2008-12-29 21:25:33.317589186
+0100
+++ btrfs-unstable-standalone/export.c 2008-12-29 21:26:46.658692859 +0100
@@ -146,6 +146,7 @@
int ret;
path = btrfs_alloc_path();
+ BUG_ON(!path);
key.objectid = dir->i_ino;
btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
Index: btrfs-unstable-standalone/extent-tree.c
===================================================================
--- btrfs-unstable-standalone.orig/extent-tree.c 2008-12-29
21:26:52.133589589 +0100
+++ btrfs-unstable-standalone/extent-tree.c 2008-12-29 21:29:33.000589414
+0100
@@ -1337,6 +1337,7 @@
WARN_ON(num_bytes < root->sectorsize);
path = btrfs_alloc_path();
+ BUG_ON(!path);
path->reada = 1;
key.objectid = bytenr;
key.offset = num_bytes;
@@ -1377,6 +1378,7 @@
key.type = BTRFS_EXTENT_ITEM_KEY;
path = btrfs_alloc_path();
+ BUG_ON(!path);
ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
if (ret < 0)
goto out;
@@ -2132,6 +2134,7 @@
int num_inserts = 0, max_inserts;
path = btrfs_alloc_path();
+ BUG_ON(!path);
INIT_LIST_HEAD(&insert_list);
INIT_LIST_HEAD(&update_list);
Index: btrfs-unstable-standalone/file-item.c
===================================================================
--- btrfs-unstable-standalone.orig/file-item.c 2008-12-29 21:30:59.441588913
+0100
+++ btrfs-unstable-standalone/file-item.c 2008-12-29 21:31:58.836588923
+0100
@@ -160,6 +160,7 @@
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
path = btrfs_alloc_path();
+ BUG_ON(!path);
if (bio->bi_size > PAGE_CACHE_SIZE * 8)
path->reada = 2;
@@ -506,6 +507,7 @@
root = root->fs_info->csum_root;
path = btrfs_alloc_path();
+ BUG_ON(!path);
while(1) {
key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
Index: btrfs-unstable-standalone/file.c
===================================================================
--- btrfs-unstable-standalone.orig/file.c 2008-12-29 21:30:18.940839123
+0100
+++ btrfs-unstable-standalone/file.c 2008-12-29 21:30:38.941774195 +0100
@@ -293,6 +293,7 @@
u64 extent_end = 0;
path = btrfs_alloc_path();
+ BUG_ON(!path);
ret = btrfs_lookup_file_extent(NULL, root, path, inode->i_ino,
last_offset, 0);
while(1) {
Index: btrfs-unstable-standalone/inode.c
===================================================================
--- btrfs-unstable-standalone.orig/inode.c 2008-12-29 21:32:03.109588918
+0100
+++ btrfs-unstable-standalone/inode.c 2008-12-29 21:35:12.321588484 +0100
@@ -2504,8 +2504,8 @@
if (root->ref_cows)
btrfs_drop_extent_cache(inode, new_size & (~mask), (u64)-1, 0);
path = btrfs_alloc_path();
- path->reada = -1;
BUG_ON(!path);
+ path->reada = -1;
/* FIXME, add redo link to tree so we don't leak on crash */
key.objectid = inode->i_ino;
@@ -3182,6 +3182,7 @@
filp->f_pos = 2;
}
path = btrfs_alloc_path();
+ BUG_ON(!path);
path->reada = 2;
btrfs_set_key_type(&key, key_type);
Index: btrfs-unstable-standalone/ioctl.c
===================================================================
--- btrfs-unstable-standalone.orig/ioctl.c 2008-12-29 21:35:26.854838809
+0100
+++ btrfs-unstable-standalone/ioctl.c 2008-12-29 21:36:27.742591734 +0100
@@ -292,6 +292,7 @@
u64 test_oid;
u64 parent_oid = BTRFS_I(dir->d_inode)->root->root_key.objectid;
+ BUG_ON(!path);
test_oid = snap_src->root_key.objectid;
ret = btrfs_find_root_ref(snap_src->fs_info->tree_root,
Index: btrfs-unstable-standalone/root-tree.c
===================================================================
--- btrfs-unstable-standalone.orig/root-tree.c 2008-12-29 21:36:49.242838916
+0100
+++ btrfs-unstable-standalone/root-tree.c 2008-12-29 21:37:53.940590092
+0100
@@ -286,6 +286,7 @@
struct btrfs_path *path;
path = btrfs_alloc_path();
+ BUG_ON(!path);
key.objectid = root_id;
key.type = type;
@@ -346,6 +347,7 @@
path = btrfs_alloc_path();
+ BUG_ON(!path);
key.objectid = root_id;
key.type = type;
Index: btrfs-unstable-standalone/tree-log.c
===================================================================
--- btrfs-unstable-standalone.orig/tree-log.c 2008-12-29 21:38:05.420838636
+0100
+++ btrfs-unstable-standalone/tree-log.c 2008-12-29 21:40:13.594588854
+0100
@@ -708,6 +708,7 @@
int match = 0;
path = btrfs_alloc_path();
+ BUG_ON(!path);
ret = btrfs_search_slot(NULL, log, key, path, 0, 0);
if (ret != 0)
goto out;
@@ -989,6 +990,7 @@
key.offset = (u64)-1;
path = btrfs_alloc_path();
+ BUG_ON(!path);
while(1) {
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
@@ -2109,6 +2111,7 @@
log = root->log_root;
path = btrfs_alloc_path();
+ BUG_ON(!path);
di = btrfs_lookup_dir_item(trans, log, path, dir->i_ino,
name, name_len, -1);
if (di && !IS_ERR(di)) {
@@ -2476,6 +2479,7 @@
list_add_tail(&sums->list, list);
path = btrfs_alloc_path();
+ BUG_ON(!path);
while(disk_bytenr < end) {
if (!item || disk_bytenr < item_start_offset ||
disk_bytenr >= item_last_offset) {
@@ -2683,7 +2687,9 @@
log = root->log_root;
path = btrfs_alloc_path();
+ BUG_ON(!path);
dst_path = btrfs_alloc_path();
+ BUG_ON(!dst_path);
min_key.objectid = inode->i_ino;
min_key.type = BTRFS_INODE_ITEM_KEY;
--
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