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/segment.c b/fs/nilfs2/segment.c
index 3ae4a38..097f9c4 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -1457,21 +1457,16 @@
struct inode *sufile)
{
struct nilfs_segment_buffer *segbuf;
- struct buffer_head *bh_su;
- struct nilfs_segment_usage *raw_su;
unsigned long live_blocks;
int ret;
list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
- ret = nilfs_sufile_get_segment_usage(sufile, segbuf->sb_segnum,
- &raw_su, &bh_su);
- WARN_ON(ret); /* always succeed because bh_su is dirty */
live_blocks = segbuf->sb_sum.nblocks +
(segbuf->sb_pseg_start - segbuf->sb_fseg_start);
- raw_su->su_lastmod = cpu_to_le64(sci->sc_seg_ctime);
- raw_su->su_nblocks = cpu_to_le32(live_blocks);
- nilfs_sufile_put_segment_usage(sufile, segbuf->sb_segnum,
- bh_su);
+ ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
+ live_blocks,
+ sci->sc_seg_ctime);
+ WARN_ON(ret); /* always succeed because the segusage is dirty */
}
}
@@ -1479,25 +1474,18 @@
struct inode *sufile)
{
struct nilfs_segment_buffer *segbuf;
- struct buffer_head *bh_su;
- struct nilfs_segment_usage *raw_su;
int ret;
segbuf = NILFS_FIRST_SEGBUF(&sci->sc_segbufs);
- ret = nilfs_sufile_get_segment_usage(sufile, segbuf->sb_segnum,
- &raw_su, &bh_su);
- WARN_ON(ret); /* always succeed because bh_su is dirty */
- raw_su->su_nblocks = cpu_to_le32(segbuf->sb_pseg_start -
- segbuf->sb_fseg_start);
- nilfs_sufile_put_segment_usage(sufile, segbuf->sb_segnum, bh_su);
+ ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
+ segbuf->sb_pseg_start -
+ segbuf->sb_fseg_start, 0);
+ WARN_ON(ret); /* always succeed because the segusage is dirty */
list_for_each_entry_continue(segbuf, &sci->sc_segbufs, sb_list) {
- ret = nilfs_sufile_get_segment_usage(sufile, segbuf->sb_segnum,
- &raw_su, &bh_su);
+ ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
+ 0, 0);
WARN_ON(ret); /* always succeed */
- raw_su->su_nblocks = 0;
- nilfs_sufile_put_segment_usage(sufile, segbuf->sb_segnum,
- bh_su);
}
}
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
diff --git a/fs/nilfs2/sufile.h b/fs/nilfs2/sufile.h
index 4146a65..e1186bf 100644
--- a/fs/nilfs2/sufile.h
+++ b/fs/nilfs2/sufile.h
@@ -43,6 +43,8 @@
void nilfs_sufile_put_segment_usage(struct inode *, __u64,
struct buffer_head *);
int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum);
+int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
+ unsigned long nblocks, time_t modtime);
int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *);
ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, void *, unsigned,
size_t);