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Btrfs: check return value of read_tree_block() 

This patch is checking return value of read_tree_block(),
and if it is NULL, error processing.

Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Tsutomu Itoh 2011-03-24 06:33:21 +00:00 committed by root
parent 7e75bf3ff3
commit 97d9a8a420
3 changed files with 15 additions and 0 deletions
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3
fs/btrfs/ctree.c
View File

@ -682,6 +682,8 @@ int btrfs_realloc_node(struct btrfs_trans_handle *trans,
if (!cur) {
cur = read_tree_block(root, blocknr,
blocksize, gen);
if (!cur)
return -EIO;
} else if (!uptodate) {
btrfs_read_buffer(cur, gen);
}
@ -4087,6 +4089,7 @@ find_next_key:
}
btrfs_set_path_blocking(path);
cur = read_node_slot(root, cur, slot);
BUG_ON(!cur);
btrfs_tree_lock(cur);

6
fs/btrfs/extent-tree.c
View File

@ -6067,6 +6067,8 @@ static noinline int do_walk_down(struct btrfs_trans_handle *trans,
if (reada && level == 1)
reada_walk_down(trans, root, wc, path);
next = read_tree_block(root, bytenr, blocksize, generation);
if (!next)
return -EIO;
btrfs_tree_lock(next);
btrfs_set_lock_blocking(next);
}
@ -7937,6 +7939,10 @@ static noinline int relocate_one_extent(struct btrfs_root *extent_root,
eb = read_tree_block(found_root, block_start,
block_size, 0);
if (!eb) {
ret = -EIO;
goto out;
}
btrfs_tree_lock(eb);
BUG_ON(level != btrfs_header_level(eb));

6
fs/btrfs/relocation.c
View File

@ -1724,6 +1724,7 @@ again:
eb = read_tree_block(dest, old_bytenr, blocksize,
old_ptr_gen);
BUG_ON(!eb);
btrfs_tree_lock(eb);
if (cow) {
ret = btrfs_cow_block(trans, dest, eb, parent,
@ -2513,6 +2514,10 @@ static int do_relocation(struct btrfs_trans_handle *trans,
blocksize = btrfs_level_size(root, node->level);
generation = btrfs_node_ptr_generation(upper->eb, slot);
eb = read_tree_block(root, bytenr, blocksize, generation);
if (!eb) {
err = -EIO;
goto next;
}
btrfs_tree_lock(eb);
btrfs_set_lock_blocking(eb);
@ -2670,6 +2675,7 @@ static int get_tree_block_key(struct reloc_control *rc,
BUG_ON(block->key_ready);
eb = read_tree_block(rc->extent_root, block->bytenr,
block->key.objectid, block->key.offset);
BUG_ON(!eb);
WARN_ON(btrfs_header_level(eb) != block->level);
if (block->level == 0)
btrfs_item_key_to_cpu(eb, &block->key, 0);