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| author | Jeff Mahoney <jeffm@suse.com> | 2011-10-03 23:23:15 -0400 |
|---|---|---|
| committer | David Sterba <dsterba@suse.cz> | 2012-03-22 01:45:34 +0100 |
| commit | ffd7b33944f4573a063af7a55f8a5199c8185665 (patch) | |
| tree | bb7b3b2293bedc58b0d09f146ef68d0614432072 | |
| parent | 355808c296c6923db6705f43639969a80b16d15d (diff) | |
| download | linux-stable-ffd7b33944f4573a063af7a55f8a5199c8185665.tar.gz linux-stable-ffd7b33944f4573a063af7a55f8a5199c8185665.tar.bz2 linux-stable-ffd7b33944f4573a063af7a55f8a5199c8185665.zip | |
btrfs: __add_reloc_root error push-up
This patch pushes kmalloc errors up to the caller and BUGs in the caller.
The BUG_ON for duplicate reloc tree root insertion is replaced with a
panic explaining the issue.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
| -rw-r--r-- | fs/btrfs/relocation.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c index e5996ff8aaa4..974b0dfeffa3 100644 --- a/fs/btrfs/relocation.c +++ b/fs/btrfs/relocation.c @@ -1221,14 +1221,15 @@ fail: /* * helper to add 'address of tree root -> reloc tree' mapping */ -static int __add_reloc_root(struct btrfs_root *root) +static int __must_check __add_reloc_root(struct btrfs_root *root) { struct rb_node *rb_node; struct mapping_node *node; struct reloc_control *rc = root->fs_info->reloc_ctl; node = kmalloc(sizeof(*node), GFP_NOFS); - BUG_ON(!node); + if (!node) + return -ENOMEM; node->bytenr = root->node->start; node->data = root; @@ -1237,7 +1238,12 @@ static int __add_reloc_root(struct btrfs_root *root) rb_node = tree_insert(&rc->reloc_root_tree.rb_root, node->bytenr, &node->rb_node); spin_unlock(&rc->reloc_root_tree.lock); - BUG_ON(rb_node); + if (rb_node) { + kfree(node); + btrfs_panic(root->fs_info, -EEXIST, "Duplicate root found " + "for start=%llu while inserting into relocation " + "tree\n"); + } list_add_tail(&root->root_list, &rc->reloc_roots); return 0; @@ -1353,6 +1359,7 @@ int btrfs_init_reloc_root(struct btrfs_trans_handle *trans, struct btrfs_root *reloc_root; struct reloc_control *rc = root->fs_info->reloc_ctl; int clear_rsv = 0; + int ret; if (root->reloc_root) { reloc_root = root->reloc_root; @@ -1372,7 +1379,8 @@ int btrfs_init_reloc_root(struct btrfs_trans_handle *trans, if (clear_rsv) trans->block_rsv = NULL; - __add_reloc_root(reloc_root); + ret = __add_reloc_root(reloc_root); + BUG_ON(ret < 0); root->reloc_root = reloc_root; return 0; } @@ -4226,7 +4234,8 @@ int btrfs_recover_relocation(struct btrfs_root *root) reloc_root->root_key.offset); BUG_ON(IS_ERR(fs_root)); - __add_reloc_root(reloc_root); + err = __add_reloc_root(reloc_root); + BUG_ON(err < 0); fs_root->reloc_root = reloc_root; } @@ -4428,7 +4437,8 @@ void btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans, reloc_root = create_reloc_root(trans, root->reloc_root, new_root->root_key.objectid); - __add_reloc_root(reloc_root); + ret = __add_reloc_root(reloc_root); + BUG_ON(ret < 0); new_root->reloc_root = reloc_root; if (rc->create_reloc_tree) { |