bcachefs: Simplify bch2_write_inode_trans, fix lockdep splat

ei_update_lock isn't currently needed for write inode (but it will be
needed again when deferred btree updates are used for inode updates)

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

diff --git a/fs/bcachefs/fs-io.c b/fs/bcachefs/fs-io.c
index b53fbdc..29d289b 100644 (file)
--- a/fs/bcachefs/fs-io.c
+++ b/fs/bcachefs/fs-io.c
@@ -355,8 +355,6 @@ bchfs_extent_update_hook(struct extent_insert_hook *hook,
                h->inode_u.bi_size = offset;
                do_pack = true;
 
-               inode->ei_inode.bi_size = offset;
-
                spin_lock(&inode->v.i_lock);
                if (offset > inode->v.i_size) {
                        if (h->op->is_dio)
@@ -478,6 +476,7 @@ static int bchfs_write_index_update(struct bch_write_op *wop)
                                        &hook.hook, op_journal_seq(wop),
                                        BTREE_INSERT_NOFAIL|
                                        BTREE_INSERT_ATOMIC|
+                                       BTREE_INSERT_NOUNLOCK|
                                        BTREE_INSERT_USE_RESERVE,
                                        BTREE_INSERT_ENTRY(extent_iter, k));
                }
@@ -493,6 +492,9 @@ err:
                if (ret)
                        break;
 
+               if (hook.need_inode_update)
+                       op->inode->ei_inode = hook.inode_u;
+
                BUG_ON(bkey_cmp(extent_iter->pos, k->k.p) < 0);
                bch2_keylist_pop_front(keys);
        } while (!bch2_keylist_empty(keys));

diff --git a/fs/bcachefs/fs.c b/fs/bcachefs/fs.c
index 3f3d916..53107d0 100644 (file)
--- a/fs/bcachefs/fs.c
+++ b/fs/bcachefs/fs.c
@@ -157,35 +157,20 @@ int __must_check bch2_write_inode_trans(struct btree_trans *trans,
 {
        struct btree_iter *iter;
        struct bkey_inode_buf *inode_p;
-       struct bkey_s_c k;
-       u64 inum = inode->v.i_ino;
        int ret;
 
-       lockdep_assert_held(&inode->ei_update_lock);
-
-       iter = bch2_trans_get_iter(trans, BTREE_ID_INODES, POS(inum, 0),
-                                  BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
+       iter = bch2_trans_get_iter(trans, BTREE_ID_INODES,
+                       POS(inode->v.i_ino, 0),
+                       BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
        if (IS_ERR(iter))
                return PTR_ERR(iter);
 
-       k = bch2_btree_iter_peek_slot(iter);
-       if ((ret = btree_iter_err(k)))
+       /* The btree node lock is our lock on the inode: */
+       ret = bch2_btree_iter_traverse(iter);
+       if (ret)
                return ret;
 
-       if (WARN_ONCE(k.k->type != BCH_INODE_FS,
-                     "inode %llu not found when updating", inum))
-               return -ENOENT;
-
-       ret = bch2_inode_unpack(bkey_s_c_to_inode(k), inode_u);
-       if (WARN_ONCE(ret,
-                     "error %i unpacking inode %llu", ret, inum))
-               return -ENOENT;
-
-       BUG_ON(inode_u->bi_size != inode->ei_inode.bi_size);
-
-       BUG_ON(inode_u->bi_size != inode->ei_inode.bi_size &&
-              !(inode_u->bi_flags & BCH_INODE_I_SIZE_DIRTY) &&
-              inode_u->bi_size > i_size_read(&inode->v));
+       *inode_u = inode->ei_inode;
 
        if (set) {
                ret = set(inode, inode_u, p);
@@ -505,8 +490,6 @@ static int __bch2_link(struct bch_fs *c,
        struct bch_inode_unpacked inode_u;
        int ret;
 
-       lockdep_assert_held(&inode->v.i_rwsem);
-
        bch2_trans_init(&trans, c);
 retry:
        bch2_trans_begin(&trans);
@@ -543,6 +526,8 @@ static int bch2_link(struct dentry *old_dentry, struct inode *vdir,
        struct bch_inode_info *inode = to_bch_ei(old_dentry->d_inode);
        int ret;
 
+       lockdep_assert_held(&inode->v.i_rwsem);
+
        ret = __bch2_link(c, inode, dir, dentry);
        if (unlikely(ret))
                return ret;