Btrfs: fix no reserved space for writing out inode cache

I-node cache forgets to reserve the space when writing out it. And when
we do some stress test, such as synctest, it will trigger WARN_ON() in
use_block_rsv().

WARNING: at fs/btrfs/extent-tree.c:5718 btrfs_alloc_free_block+0xbf/0x281 [btrfs]()
...
Call Trace:
 [<ffffffff8104df86>] warn_slowpath_common+0x80/0x98
 [<ffffffff8104dfb3>] warn_slowpath_null+0x15/0x17
 [<ffffffffa0369c60>] btrfs_alloc_free_block+0xbf/0x281 [btrfs]
 [<ffffffff810cbcb8>] ? __set_page_dirty_nobuffers+0xfe/0x108
 [<ffffffffa035c040>] __btrfs_cow_block+0x118/0x3b5 [btrfs]
 [<ffffffffa035c7ba>] btrfs_cow_block+0x103/0x14e [btrfs]
 [<ffffffffa035e4c4>] btrfs_search_slot+0x249/0x6a4 [btrfs]
 [<ffffffffa036d086>] btrfs_lookup_inode+0x2a/0x8a [btrfs]
 [<ffffffffa03788b7>] btrfs_update_inode+0xaa/0x141 [btrfs]
 [<ffffffffa036d7ec>] btrfs_save_ino_cache+0xea/0x202 [btrfs]
 [<ffffffffa03a761e>] ? btrfs_update_reloc_root+0x17e/0x197 [btrfs]
 [<ffffffffa0373867>] commit_fs_roots+0xaa/0x158 [btrfs]
 [<ffffffffa03746a6>] btrfs_commit_transaction+0x405/0x731 [btrfs]
 [<ffffffff810690df>] ? wake_up_bit+0x25/0x25
 [<ffffffffa039d652>] ? btrfs_log_dentry_safe+0x43/0x51 [btrfs]
 [<ffffffffa0381c5f>] btrfs_sync_file+0x16a/0x198 [btrfs]
 [<ffffffff81122806>] ? mntput+0x21/0x23
 [<ffffffff8112d150>] vfs_fsync_range+0x18/0x21
 [<ffffffff8112d170>] vfs_fsync+0x17/0x19
 [<ffffffff8112d316>] do_fsync+0x29/0x3e
 [<ffffffff8112d348>] sys_fsync+0xb/0xf
 [<ffffffff81468352>] system_call_fastpath+0x16/0x1b

Sometimes it causes BUG_ON() in the reservation code of the delayed inode
is triggered.

So we must reserve enough space for inode cache.

Note: If we can not reserve the enough space for inode cache, we will
give up writing out it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/inode-map.c b/fs/btrfs/inode-map.c
index 53dcbdf..f8962a9 100644 (file)
--- a/fs/btrfs/inode-map.c
+++ b/fs/btrfs/inode-map.c
@@ -398,6 +398,8 @@ int btrfs_save_ino_cache(struct btrfs_root *root,
        struct btrfs_free_space_ctl *ctl = root->free_ino_ctl;
        struct btrfs_path *path;
        struct inode *inode;
+       struct btrfs_block_rsv *rsv;
+       u64 num_bytes;
        u64 alloc_hint = 0;
        int ret;
        int prealloc;
@@ -421,11 +423,26 @@ int btrfs_save_ino_cache(struct btrfs_root *root,
        if (!path)
                return -ENOMEM;
 
+       rsv = trans->block_rsv;
+       trans->block_rsv = &root->fs_info->trans_block_rsv;
+
+       num_bytes = trans->bytes_reserved;
+       /*
+        * 1 item for inode item insertion if need
+        * 3 items for inode item update (in the worst case)
+        * 1 item for free space object
+        * 3 items for pre-allocation
+        */
+       trans->bytes_reserved = btrfs_calc_trans_metadata_size(root, 8);
+       ret = btrfs_block_rsv_add_noflush(root, trans->block_rsv,
+                                         trans->bytes_reserved);
+       if (ret)
+               goto out;
 again:
        inode = lookup_free_ino_inode(root, path);
        if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) {
                ret = PTR_ERR(inode);
-               goto out;
+               goto out_release;
        }
 
        if (IS_ERR(inode)) {
@@ -434,7 +451,7 @@ again:
 
                ret = create_free_ino_inode(root, trans, path);
                if (ret)
-                       goto out;
+                       goto out_release;
                goto again;
        }
 
@@ -477,11 +494,14 @@ again:
        }
        btrfs_free_reserved_data_space(inode, prealloc);
 
+       ret = btrfs_write_out_ino_cache(root, trans, path);
 out_put:
        iput(inode);
+out_release:
+       btrfs_block_rsv_release(root, trans->block_rsv, trans->bytes_reserved);
 out:
-       if (ret == 0)
-               ret = btrfs_write_out_ino_cache(root, trans, path);
+       trans->block_rsv = rsv;
+       trans->bytes_reserved = num_bytes;
 
        btrfs_free_path(path);
        return ret;