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authorSrinivas Eeda <srinivas.eeda@oracle.com>2009-06-04 04:02:55 +0400
committerJoel Becker <joel.becker@oracle.com>2009-06-04 06:14:31 +0400
commit83273932fbefb6ceef9c0b82ac4d23900728f4d9 (patch)
tree7ece8471af3d2a22543542e990369aca47aa3d25 /fs/ocfs2/ocfs2_lockid.h
parentedd45c08499a3e9d4c25431cd2b6a9ce5f692c92 (diff)
downloadlinux-83273932fbefb6ceef9c0b82ac4d23900728f4d9.tar.xz
ocfs2: timer to queue scan of all orphan slots
When a dentry is unlinked, the unlinking node takes an EX on the dentry lock before moving the dentry to the orphan directory. Other nodes that have this dentry in cache have a PR on the same dentry lock. When the EX is requested, the other nodes flag the corresponding inode as MAYBE_ORPHANED during downconvert. The inode is finally deleted when the last node to iput the inode sees that i_nlink==0 and the MAYBE_ORPHANED flag is set. A problem arises if a node is forced to free dentry locks because of memory pressure. If this happens, the node will no longer get downconvert notifications for the dentries that have been unlinked on another node. If it also happens that node is actively using the corresponding inode and happens to be the one performing the last iput on that inode, it will fail to delete the inode as it will not have the MAYBE_ORPHANED flag set. This patch fixes this shortcoming by introducing a periodic scan of the orphan directories to delete such inodes. Care has been taken to distribute the workload across the cluster so that no one node has to perform the task all the time. Signed-off-by: Srinivas Eeda <srinivas.eeda@oracle.com> Signed-off-by: Joel Becker <joel.becker@oracle.com>
Diffstat (limited to 'fs/ocfs2/ocfs2_lockid.h')
-rw-r--r--fs/ocfs2/ocfs2_lockid.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/ocfs2/ocfs2_lockid.h b/fs/ocfs2/ocfs2_lockid.h
index a53ce87481bf..fcdba091af3d 100644
--- a/fs/ocfs2/ocfs2_lockid.h
+++ b/fs/ocfs2/ocfs2_lockid.h
@@ -48,6 +48,7 @@ enum ocfs2_lock_type {
OCFS2_LOCK_TYPE_FLOCK,
OCFS2_LOCK_TYPE_QINFO,
OCFS2_LOCK_TYPE_NFS_SYNC,
+ OCFS2_LOCK_TYPE_ORPHAN_SCAN,
OCFS2_NUM_LOCK_TYPES
};
@@ -85,6 +86,9 @@ static inline char ocfs2_lock_type_char(enum ocfs2_lock_type type)
case OCFS2_LOCK_TYPE_NFS_SYNC:
c = 'Y';
break;
+ case OCFS2_LOCK_TYPE_ORPHAN_SCAN:
+ c = 'P';
+ break;
default:
c = '\0';
}
@@ -104,6 +108,7 @@ static char *ocfs2_lock_type_strings[] = {
[OCFS2_LOCK_TYPE_OPEN] = "Open",
[OCFS2_LOCK_TYPE_FLOCK] = "Flock",
[OCFS2_LOCK_TYPE_QINFO] = "Quota",
+ [OCFS2_LOCK_TYPE_ORPHAN_SCAN] = "OrphanScan",
};
static inline const char *ocfs2_lock_type_string(enum ocfs2_lock_type type)