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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-11-18 12:23:34 +0300
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-11-20 04:05:51 +0300
commit071ec54dd730307ee0e703a105872b9a1c6fd2aa (patch)
treefb6629e471adf24d432487e0641549fd38d20ef3 /fs/nilfs2/sufile.c
parent61a189e9c62359cd12b2aa3bd6ab9cffa6cf2745 (diff)
downloadlinux-071ec54dd730307ee0e703a105872b9a1c6fd2aa.tar.xz
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>
Diffstat (limited to 'fs/nilfs2/sufile.c')
-rw-r--r--fs/nilfs2/sufile.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/fs/nilfs2/sufile.c b/fs/nilfs2/sufile.c
index d560f882a868..3eed998df1c8 100644
--- a/fs/nilfs2/sufile.c
+++ b/fs/nilfs2/sufile.c
@@ -521,6 +521,43 @@ int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum)
}
/**
+ * 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