nilfs2: fix wrong accounting and duplicate brelse in nilfs_sufile_set_error

The nilfs_sufile_set_error() function wrongly adjusts the number of
dirty segments instead of the number of clean segments.  In addition,
the function calls brelse() twice for the same buffer head.

This fixes these bugs.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

diff --git a/fs/nilfs2/sufile.c b/fs/nilfs2/sufile.c
index 1ef2b4d9d794e2290a84650a4483bec168e5d402..8b2f93ca1e165a66837db5d9e58b79624ad5f83b 100644 (file)
--- a/fs/nilfs2/sufile.c
+++ b/fs/nilfs2/sufile.c
@@ -523,7 +523,7 @@ int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum)
        struct nilfs_segment_usage *su;
        struct nilfs_sufile_header *header;
        void *kaddr;
-       int ret;
+       int suclean, ret;
 
        if (unlikely(segnum >= nilfs_sufile_get_nsegments(sufile))) {
                printk(KERN_WARNING "%s: invalid segment number: %llu\n",
@@ -546,16 +546,19 @@ int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum)
                brelse(su_bh);
                goto out_header;
        }
+       suclean = nilfs_segment_usage_clean(su);
 
        nilfs_segment_usage_set_error(su);
        kunmap_atomic(kaddr, KM_USER0);
-       brelse(su_bh);
 
-       kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
-       header = nilfs_sufile_block_get_header(sufile, header_bh, kaddr);
-       le64_add_cpu(&header->sh_ndirtysegs, -1);
-       kunmap_atomic(kaddr, KM_USER0);
-       nilfs_mdt_mark_buffer_dirty(header_bh);
+       if (suclean) {
+               kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
+               header = nilfs_sufile_block_get_header(sufile, header_bh,
+                                                      kaddr);
+               le64_add_cpu(&header->sh_ncleansegs, -1);
+               kunmap_atomic(kaddr, KM_USER0);
+               nilfs_mdt_mark_buffer_dirty(header_bh);
+       }
        nilfs_mdt_mark_buffer_dirty(su_bh);
        nilfs_mdt_mark_dirty(sufile);
        brelse(su_bh);