bcachefs: Use bch2_inode_find_by_inum() in truncate

This is needed for snapshots because we need to start handling lock
restarts even when just calling bch2_inode_peek().

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

diff --git a/fs/bcachefs/fs-io.c b/fs/bcachefs/fs-io.c
index 30c12864d53767e58bfdaf58c92b017f9dbe8ea6..4af8cd018e3aafe4be4e6c3fb9de24618484add8 100644 (file)
--- a/fs/bcachefs/fs-io.c
+++ b/fs/bcachefs/fs-io.c
@@ -2296,8 +2296,6 @@ int bch2_truncate(struct mnt_idmap *idmap,
        struct bch_fs *c = inode->v.i_sb->s_fs_info;
        struct address_space *mapping = inode->v.i_mapping;
        struct bch_inode_unpacked inode_u;
-       struct btree_trans trans;
-       struct btree_iter *iter;
        u64 new_i_size = iattr->ia_size;
        s64 i_sectors_delta = 0;
        int ret = 0;
@@ -2318,16 +2316,7 @@ int bch2_truncate(struct mnt_idmap *idmap,
        inode_dio_wait(&inode->v);
        bch2_pagecache_block_get(&inode->ei_pagecache_lock);
 
-       /*
-        * fetch current on disk i_size: inode is locked, i_size can only
-        * increase underneath us:
-        */
-       bch2_trans_init(&trans, c, 0, 0);
-       iter = bch2_inode_peek(&trans, &inode_u, inode->v.i_ino, 0);
-       ret = PTR_ERR_OR_ZERO(iter);
-       bch2_trans_iter_put(&trans, iter);
-       bch2_trans_exit(&trans);
-
+       ret = bch2_inode_find_by_inum(c, inode->v.i_ino, &inode_u);
        if (ret)
                goto err;