nilfs2: move routine to set segment usage into sufile
This adds nilfs_sufile_set_segment_usage() function in sufile to
replace direct access to the sufile metadata in log writer code.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
diff --git a/fs/nilfs2/sufile.c b/fs/nilfs2/sufile.c
index d560f88..3eed998 100644
--- a/fs/nilfs2/sufile.c
+++ b/fs/nilfs2/sufile.c
@@ -521,6 +521,43 @@
}
/**
+ * nilfs_sufile_set_segment_usage - set usage of a segment
+ * @sufile: inode of segment usage file
+ * @segnum: segment number
+ * @nblocks: number of live blocks in the segment
+ * @modtime: modification time (option)
+ */
+int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
+ unsigned long nblocks, time_t modtime)
+{
+ struct buffer_head *bh;
+ struct nilfs_segment_usage *su;
+ void *kaddr;
+ int ret;
+
+ down_write(&NILFS_MDT(sufile)->mi_sem);
+ ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh);
+ if (ret < 0)
+ goto out_sem;
+
+ kaddr = kmap_atomic(bh->b_page, KM_USER0);
+ su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr);
+ WARN_ON(nilfs_segment_usage_error(su));
+ if (modtime)
+ su->su_lastmod = cpu_to_le64(modtime);
+ su->su_nblocks = cpu_to_le32(nblocks);
+ kunmap_atomic(kaddr, KM_USER0);
+
+ nilfs_mdt_mark_buffer_dirty(bh);
+ nilfs_mdt_mark_dirty(sufile);
+ brelse(bh);
+
+ out_sem:
+ up_write(&NILFS_MDT(sufile)->mi_sem);
+ return ret;
+}
+
+/**
* nilfs_sufile_get_stat - get segment usage statistics
* @sufile: inode of segment usage file
* @stat: pointer to a structure of segment usage statistics
