lib-fs: Optimized fs_stat() for fs-metawrap after writing a file.

diff --git a/src/lib-fs/fs-metawrap.c b/src/lib-fs/fs-metawrap.c
index 8e7aaadb480de69b764e72d0ceead5979f603dcb..06cb64ff3a000055478c8c4985cbf7edbe4172ca 100644 (file)
--- a/src/lib-fs/fs-metawrap.c
+++ b/src/lib-fs/fs-metawrap.c
@@ -354,6 +354,8 @@ fs_metawrap_create_updated_istream(struct metawrap_fs_file *file,
        input2 = i_stream_create_concat(inputs);
        i_stream_unref(&inputs[0]);
        i_stream_unref(&inputs[1]);
+
+       file->metadata_write_size = str_len(file->metadata_header);
        return input2;
 }
 
@@ -450,6 +452,16 @@ static int fs_metawrap_stat(struct fs_file *_file, struct stat *st_r)
 
        if (!file->fs->wrap_metadata)
                return fs_stat(file->super, st_r);
+
+       if (file->metadata_write_size != 0) {
+               /* fs_stat() after a write. we can do this quickly. */
+               if (fs_stat(file->super, st_r) < 0)
+                       return -1;
+               i_assert((uoff_t)st_r->st_size > file->metadata_write_size);
+               st_r->st_size -= file->metadata_write_size;
+               return 0;
+       }
+
        input = fs_read_stream(_file, IO_BLOCK_SIZE);
        if ((ret = i_stream_get_size(input, TRUE, &input_size)) < 0) {
                fs_set_error(_file->fs, "i_stream_get_size(%s) failed: %m",