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Btrfs: Fix data=ordered vs wait_on_inode deadlock on older kernels 

Using ilookup5 during data=ordered writeback could deadlock on I_LOCK.  This
saves a pointer to the inode instead.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-01-16 16:09:22 -05:00
parent 2da98f003f
commit 4d5e74bc0a
3 changed files with 27 additions and 21 deletions
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12
fs/btrfs/ordered-data.c
View File

@ -25,6 +25,7 @@
struct tree_entry {
u64 root_objectid;
u64 objectid;
struct inode *inode;
struct rb_node rb_node;
};
@ -144,6 +145,7 @@ int btrfs_add_ordered_inode(struct inode *inode)
write_lock(&tree->lock);
entry->objectid = inode->i_ino;
entry->root_objectid = root_objectid;
entry->inode = inode;
node = tree_insert(&tree->tree, root_objectid,
inode->i_ino, &entry->rb_node);
@ -159,7 +161,8 @@ int btrfs_add_ordered_inode(struct inode *inode)
}
int btrfs_find_first_ordered_inode(struct btrfs_ordered_inode_tree *tree,
u64 *root_objectid, u64 *objectid)
u64 *root_objectid, u64 *objectid,
struct inode **inode)
{
struct tree_entry *entry;
struct rb_node *node;
@ -184,13 +187,16 @@ int btrfs_find_first_ordered_inode(struct btrfs_ordered_inode_tree *tree,
}
*root_objectid = entry->root_objectid;
*inode = entry->inode;
atomic_inc(&entry->inode->i_count);
*objectid = entry->objectid;
write_unlock(&tree->lock);
return 1;
}
int btrfs_find_del_first_ordered_inode(struct btrfs_ordered_inode_tree *tree,
u64 *root_objectid, u64 *objectid)
u64 *root_objectid, u64 *objectid,
struct inode **inode)
{
struct tree_entry *entry;
struct rb_node *node;
@ -216,6 +222,8 @@ int btrfs_find_del_first_ordered_inode(struct btrfs_ordered_inode_tree *tree,
*root_objectid = entry->root_objectid;
*objectid = entry->objectid;
*inode = entry->inode;
atomic_inc(&entry->inode->i_count);
rb_erase(node, &tree->tree);
write_unlock(&tree->lock);
kfree(entry);

6
fs/btrfs/ordered-data.h
View File

@ -33,8 +33,10 @@ btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t)
int btrfs_add_ordered_inode(struct inode *inode);
int btrfs_find_del_first_ordered_inode(struct btrfs_ordered_inode_tree *tree,
u64 *root_objectid, u64 *objectid);
u64 *root_objectid, u64 *objectid,
struct inode **inode);
int btrfs_find_first_ordered_inode(struct btrfs_ordered_inode_tree *tree,
u64 *root_objectid, u64 *objectid);
u64 *root_objectid, u64 *objectid,
struct inode **inode);
int btrfs_del_ordered_inode(struct inode *inode);
#endif

30
fs/btrfs/transaction.c
View File

@ -490,19 +490,17 @@ int btrfs_write_ordered_inodes(struct btrfs_trans_handle *trans,
while(1) {
ret = btrfs_find_first_ordered_inode(
&cur_trans->ordered_inode_tree,
&root_objectid, &objectid);
&root_objectid, &objectid, &inode);
if (!ret)
break;
mutex_unlock(&root->fs_info->trans_mutex);
mutex_unlock(&root->fs_info->fs_mutex);
inode = btrfs_ilookup(root->fs_info->sb, objectid,
root_objectid);
if (inode) {
if (S_ISREG(inode->i_mode))
filemap_fdatawrite(inode->i_mapping);
iput(inode);
}
if (S_ISREG(inode->i_mode))
filemap_fdatawrite(inode->i_mapping);
iput(inode);
mutex_lock(&root->fs_info->fs_mutex);
mutex_lock(&root->fs_info->trans_mutex);
}
@ -511,19 +509,17 @@ int btrfs_write_ordered_inodes(struct btrfs_trans_handle *trans,
objectid = 0;
ret = btrfs_find_del_first_ordered_inode(
&cur_trans->ordered_inode_tree,
&root_objectid, &objectid);
&root_objectid, &objectid, &inode);
if (!ret)
break;
mutex_unlock(&root->fs_info->trans_mutex);
mutex_unlock(&root->fs_info->fs_mutex);
inode = btrfs_ilookup(root->fs_info->sb, objectid,
root_objectid);
if (inode) {
if (S_ISREG(inode->i_mode))
filemap_write_and_wait(inode->i_mapping);
atomic_dec(&inode->i_count);
iput(inode);
}
if (S_ISREG(inode->i_mode))
filemap_write_and_wait(inode->i_mapping);
atomic_dec(&inode->i_count);
iput(inode);
mutex_lock(&root->fs_info->fs_mutex);
mutex_lock(&root->fs_info->trans_mutex);
}