Joseph Qi
2015-Sep-28 12:38 UTC
[Ocfs2-devel] [PATCH 2/2] ocfs2: only take lock if dio entry when recover orphans
We have no need to take inode mutex, rw and inode lock if it is not dio
entry when recover orphans. Optimize it by adding a flag
OCFS2_INODE_DIO_ORPHAN_ENTRY to ocfs2_inode_info to reduce contention.
Signed-off-by: Joseph Qi <joseph.qi at huawei.com>
---
fs/ocfs2/inode.h | 2 ++
fs/ocfs2/journal.c | 86 +++++++++++++++++++++++++++++-------------------------
2 files changed, 49 insertions(+), 39 deletions(-)
diff --git a/fs/ocfs2/inode.h b/fs/ocfs2/inode.h
index ca3431e..aac8b86 100644
--- a/fs/ocfs2/inode.h
+++ b/fs/ocfs2/inode.h
@@ -112,6 +112,8 @@ struct ocfs2_inode_info
#define OCFS2_INODE_OPEN_DIRECT 0x00000020
/* Tell the inode wipe code it's not in orphan dir */
#define OCFS2_INODE_SKIP_ORPHAN_DIR 0x00000040
+/* Entry in orphan dir with 'dio-' prefix */
+#define OCFS2_INODE_DIO_ORPHAN_ENTRY 0x00000080
static inline struct ocfs2_inode_info *OCFS2_I(struct inode *inode)
{
diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index bde475f..627d88c 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -2033,6 +2033,10 @@ static int ocfs2_orphan_filldir(struct dir_context *ctx,
const char *name,
if (IS_ERR(iter))
return 0;
+ if (!strncmp(name, OCFS2_DIO_ORPHAN_PREFIX,
+ OCFS2_DIO_ORPHAN_PREFIX_LEN))
+ OCFS2_I(iter)->ip_flags |= OCFS2_INODE_DIO_ORPHAN_ENTRY;
+
/* Skip inodes which are already added to recover list, since dio may
* happen concurrently with unlink/rename */
if (OCFS2_I(iter)->ip_next_orphan) {
@@ -2179,25 +2183,51 @@ static int ocfs2_recover_orphans(struct ocfs2_super
*osb,
iter = oi->ip_next_orphan;
oi->ip_next_orphan = NULL;
- mutex_lock(&inode->i_mutex);
- ret = ocfs2_rw_lock(inode, 1);
- if (ret < 0) {
- mlog_errno(ret);
- goto next;
- }
- /*
- * We need to take and drop the inode lock to
- * force read inode from disk.
- */
- ret = ocfs2_inode_lock(inode, &di_bh, 1);
- if (ret) {
- mlog_errno(ret);
- goto unlock_rw;
- }
+ if (oi->ip_flags & OCFS2_INODE_DIO_ORPHAN_ENTRY) {
+ mutex_lock(&inode->i_mutex);
+ ret = ocfs2_rw_lock(inode, 1);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto unlock_mutex;
+ }
+ /*
+ * We need to take and drop the inode lock to
+ * force read inode from disk.
+ */
+ ret = ocfs2_inode_lock(inode, &di_bh, 1);
+ if (ret) {
+ mlog_errno(ret);
+ goto unlock_rw;
+ }
- di = (struct ocfs2_dinode *)di_bh->b_data;
+ di = (struct ocfs2_dinode *)di_bh->b_data;
- if (inode->i_nlink == 0) {
+ if (di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL)) {
+ ret = ocfs2_truncate_file(inode, di_bh,
+ i_size_read(inode));
+ if (ret < 0) {
+ if (ret != -ENOSPC)
+ mlog_errno(ret);
+ goto unlock_inode;
+ }
+
+ ret = ocfs2_del_inode_from_orphan(osb, inode,
+ di_bh, 0, 0);
+ if (ret)
+ mlog_errno(ret);
+ }
+unlock_inode:
+ ocfs2_inode_unlock(inode, 1);
+ brelse(di_bh);
+ di_bh = NULL;
+unlock_rw:
+ ocfs2_rw_unlock(inode, 1);
+unlock_mutex:
+ mutex_unlock(&inode->i_mutex);
+
+ /* clear dio flag in ocfs2_inode_info */
+ oi->ip_flags &= ~OCFS2_INODE_DIO_ORPHAN_ENTRY;
+ } else {
spin_lock(&oi->ip_lock);
/* Set the proper information to get us going into
* ocfs2_delete_inode. */
@@ -2205,28 +2235,6 @@ static int ocfs2_recover_orphans(struct ocfs2_super *osb,
spin_unlock(&oi->ip_lock);
}
- if ((orphan_reco_type == ORPHAN_NEED_TRUNCATE) &&
- (di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL))) {
- ret = ocfs2_truncate_file(inode, di_bh,
- i_size_read(inode));
- if (ret < 0) {
- if (ret != -ENOSPC)
- mlog_errno(ret);
- goto unlock_inode;
- }
-
- ret = ocfs2_del_inode_from_orphan(osb, inode, di_bh, 0, 0);
- if (ret)
- mlog_errno(ret);
- } /* else if ORPHAN_NO_NEED_TRUNCATE, do nothing */
-unlock_inode:
- ocfs2_inode_unlock(inode, 1);
- brelse(di_bh);
- di_bh = NULL;
-unlock_rw:
- ocfs2_rw_unlock(inode, 1);
-next:
- mutex_unlock(&inode->i_mutex);
iput(inode);
inode = iter;
}
--
1.8.4.3