UBIFS: increment commit number earlier

Increment the commit number at the beginnig of the commit, instead
of doing this after the commit. This is needed for further
optimizations.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

diff --git a/fs/ubifs/commit.c b/fs/ubifs/commit.c
index 3b51631..0a6aa2c 100644 (file)
--- a/fs/ubifs/commit.c
+++ b/fs/ubifs/commit.c
@@ -74,6 +74,7 @@ static int do_commit(struct ubifs_info *c)
                        goto out_up;
        }
 
+       c->cmt_no += 1;
        err = ubifs_gc_start_commit(c);
        if (err)
                goto out_up;
@@ -115,7 +116,7 @@ static int do_commit(struct ubifs_info *c)
                goto out;
 
        mutex_lock(&c->mst_mutex);
-       c->mst_node->cmt_no      = cpu_to_le64(++c->cmt_no);
+       c->mst_node->cmt_no      = cpu_to_le64(c->cmt_no);
        c->mst_node->log_lnum    = cpu_to_le32(new_ltail_lnum);
        c->mst_node->root_lnum   = cpu_to_le32(zroot.lnum);
        c->mst_node->root_offs   = cpu_to_le32(zroot.offs);

diff --git a/fs/ubifs/log.c b/fs/ubifs/log.c
index e14829e..3e0aa73 100644 (file)
--- a/fs/ubifs/log.c
+++ b/fs/ubifs/log.c
@@ -412,7 +412,7 @@ int ubifs_log_start_commit(struct ubifs_info *c, int *ltail_lnum)
                return -ENOMEM;
 
        cs->ch.node_type = UBIFS_CS_NODE;
-       cs->cmt_no = cpu_to_le64(c->cmt_no + 1);
+       cs->cmt_no = cpu_to_le64(c->cmt_no);
        ubifs_prepare_node(c, cs, UBIFS_CS_NODE_SZ, 0);
 
        /*

diff --git a/fs/ubifs/orphan.c b/fs/ubifs/orphan.c
index 3afeb92..02d3462 100644 (file)
--- a/fs/ubifs/orphan.c
+++ b/fs/ubifs/orphan.c
@@ -310,10 +310,10 @@ static int write_orph_node(struct ubifs_info *c, int atomic)
        c->cmt_orphans -= cnt;
        spin_unlock(&c->orphan_lock);
        if (c->cmt_orphans)
-               orph->cmt_no = cpu_to_le64(c->cmt_no + 1);
+               orph->cmt_no = cpu_to_le64(c->cmt_no);
        else
                /* Mark the last node of the commit */
-               orph->cmt_no = cpu_to_le64((c->cmt_no + 1) | (1ULL << 63));
+               orph->cmt_no = cpu_to_le64((c->cmt_no) | (1ULL << 63));
        ubifs_assert(c->ohead_offs + len <= c->leb_size);
        ubifs_assert(c->ohead_lnum >= c->orph_first);
        ubifs_assert(c->ohead_lnum <= c->orph_last);

diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index de83471..1ee3ae4 100644 (file)
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -870,7 +870,8 @@ struct ubifs_mount_opts {
  * @highest_inum: highest used inode number
  * @vfs_gen: VFS inode generation counter
  * @max_sqnum: current global sequence number
- * @cmt_no: commit number (last successfully completed commit)
+ * @cmt_no: commit number of the last successfully completed commit, protected
+ *          by @commit_sem
  * @cnt_lock: protects @highest_inum, @vfs_gen, and @max_sqnum counters
  * @fmt_version: UBIFS on-flash format version
  * @uuid: UUID from super block