ocfs2: local mounts
This allows users to format an ocfs2 file system with a special flag,
OCFS2_FEATURE_INCOMPAT_LOCAL_MOUNT. When the file system sees this flag, it
will not use any cluster services, nor will it require a cluster
configuration, thus acting like a 'local' file system.
Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index 69fba16..e622013 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -770,7 +770,7 @@
int dlm_flags)
{
int ret = 0;
- enum dlm_status status;
+ enum dlm_status status = DLM_NORMAL;
unsigned long flags;
mlog_entry_void();
@@ -1138,6 +1138,7 @@
{
int status, level;
struct ocfs2_lock_res *lockres;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
BUG_ON(!inode);
@@ -1147,6 +1148,9 @@
(unsigned long long)OCFS2_I(inode)->ip_blkno,
write ? "EXMODE" : "PRMODE");
+ if (ocfs2_mount_local(osb))
+ return 0;
+
lockres = &OCFS2_I(inode)->ip_rw_lockres;
level = write ? LKM_EXMODE : LKM_PRMODE;
@@ -1164,6 +1168,7 @@
{
int level = write ? LKM_EXMODE : LKM_PRMODE;
struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
mlog_entry_void();
@@ -1171,7 +1176,8 @@
(unsigned long long)OCFS2_I(inode)->ip_blkno,
write ? "EXMODE" : "PRMODE");
- ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
+ if (!ocfs2_mount_local(osb))
+ ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
mlog_exit_void();
}
@@ -1182,6 +1188,7 @@
{
int status = 0, level;
struct ocfs2_lock_res *lockres;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
BUG_ON(!inode);
@@ -1201,6 +1208,9 @@
goto out;
}
+ if (ocfs2_mount_local(osb))
+ goto out;
+
lockres = &OCFS2_I(inode)->ip_data_lockres;
level = write ? LKM_EXMODE : LKM_PRMODE;
@@ -1269,6 +1279,7 @@
{
int level = write ? LKM_EXMODE : LKM_PRMODE;
struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_data_lockres;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
mlog_entry_void();
@@ -1276,7 +1287,8 @@
(unsigned long long)OCFS2_I(inode)->ip_blkno,
write ? "EXMODE" : "PRMODE");
- if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)))
+ if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)) &&
+ !ocfs2_mount_local(osb))
ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
mlog_exit_void();
@@ -1467,8 +1479,9 @@
{
int status = 0;
struct ocfs2_inode_info *oi = OCFS2_I(inode);
- struct ocfs2_lock_res *lockres;
+ struct ocfs2_lock_res *lockres = NULL;
struct ocfs2_dinode *fe;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
mlog_entry_void();
@@ -1483,10 +1496,12 @@
}
spin_unlock(&oi->ip_lock);
- lockres = &oi->ip_meta_lockres;
+ if (!ocfs2_mount_local(osb)) {
+ lockres = &oi->ip_meta_lockres;
- if (!ocfs2_should_refresh_lock_res(lockres))
- goto bail;
+ if (!ocfs2_should_refresh_lock_res(lockres))
+ goto bail;
+ }
/* This will discard any caching information we might have had
* for the inode metadata. */
@@ -1496,7 +1511,7 @@
* map (directories, bitmap files, etc) */
ocfs2_extent_map_trunc(inode, 0);
- if (ocfs2_meta_lvb_is_trustable(inode, lockres)) {
+ if (lockres && ocfs2_meta_lvb_is_trustable(inode, lockres)) {
mlog(0, "Trusting LVB on inode %llu\n",
(unsigned long long)oi->ip_blkno);
ocfs2_refresh_inode_from_lvb(inode);
@@ -1543,7 +1558,8 @@
status = 0;
bail_refresh:
- ocfs2_complete_lock_res_refresh(lockres, status);
+ if (lockres)
+ ocfs2_complete_lock_res_refresh(lockres, status);
bail:
mlog_exit(status);
return status;
@@ -1585,7 +1601,7 @@
int arg_flags)
{
int status, level, dlm_flags, acquired;
- struct ocfs2_lock_res *lockres;
+ struct ocfs2_lock_res *lockres = NULL;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct buffer_head *local_bh = NULL;
@@ -1607,6 +1623,9 @@
goto bail;
}
+ if (ocfs2_mount_local(osb))
+ goto local;
+
if (!(arg_flags & OCFS2_META_LOCK_RECOVERY))
wait_event(osb->recovery_event,
ocfs2_node_map_is_empty(osb, &osb->recovery_map));
@@ -1636,6 +1655,7 @@
wait_event(osb->recovery_event,
ocfs2_node_map_is_empty(osb, &osb->recovery_map));
+local:
/*
* We only see this flag if we're being called from
* ocfs2_read_locked_inode(). It means we're locking an inode
@@ -1644,7 +1664,8 @@
*/
if (inode->i_state & I_NEW) {
status = 0;
- ocfs2_complete_lock_res_refresh(lockres, 0);
+ if (lockres)
+ ocfs2_complete_lock_res_refresh(lockres, 0);
goto bail;
}
@@ -1767,6 +1788,7 @@
{
int level = ex ? LKM_EXMODE : LKM_PRMODE;
struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
mlog_entry_void();
@@ -1774,7 +1796,8 @@
(unsigned long long)OCFS2_I(inode)->ip_blkno,
ex ? "EXMODE" : "PRMODE");
- if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)))
+ if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)) &&
+ !ocfs2_mount_local(osb))
ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
mlog_exit_void();
@@ -1783,7 +1806,7 @@
int ocfs2_super_lock(struct ocfs2_super *osb,
int ex)
{
- int status;
+ int status = 0;
int level = ex ? LKM_EXMODE : LKM_PRMODE;
struct ocfs2_lock_res *lockres = &osb->osb_super_lockres;
struct buffer_head *bh;
@@ -1794,6 +1817,9 @@
if (ocfs2_is_hard_readonly(osb))
return -EROFS;
+ if (ocfs2_mount_local(osb))
+ goto bail;
+
status = ocfs2_cluster_lock(osb, lockres, level, 0, 0);
if (status < 0) {
mlog_errno(status);
@@ -1832,7 +1858,8 @@
int level = ex ? LKM_EXMODE : LKM_PRMODE;
struct ocfs2_lock_res *lockres = &osb->osb_super_lockres;
- ocfs2_cluster_unlock(osb, lockres, level);
+ if (!ocfs2_mount_local(osb))
+ ocfs2_cluster_unlock(osb, lockres, level);
}
int ocfs2_rename_lock(struct ocfs2_super *osb)
@@ -1843,6 +1870,9 @@
if (ocfs2_is_hard_readonly(osb))
return -EROFS;
+ if (ocfs2_mount_local(osb))
+ return 0;
+
status = ocfs2_cluster_lock(osb, lockres, LKM_EXMODE, 0, 0);
if (status < 0)
mlog_errno(status);
@@ -1854,7 +1884,8 @@
{
struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres;
- ocfs2_cluster_unlock(osb, lockres, LKM_EXMODE);
+ if (!ocfs2_mount_local(osb))
+ ocfs2_cluster_unlock(osb, lockres, LKM_EXMODE);
}
int ocfs2_dentry_lock(struct dentry *dentry, int ex)
@@ -1869,6 +1900,9 @@
if (ocfs2_is_hard_readonly(osb))
return -EROFS;
+ if (ocfs2_mount_local(osb))
+ return 0;
+
ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0);
if (ret < 0)
mlog_errno(ret);
@@ -1882,7 +1916,8 @@
struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
- ocfs2_cluster_unlock(osb, &dl->dl_lockres, level);
+ if (!ocfs2_mount_local(osb))
+ ocfs2_cluster_unlock(osb, &dl->dl_lockres, level);
}
/* Reference counting of the dlm debug structure. We want this because
@@ -2145,12 +2180,15 @@
int ocfs2_dlm_init(struct ocfs2_super *osb)
{
- int status;
+ int status = 0;
u32 dlm_key;
- struct dlm_ctxt *dlm;
+ struct dlm_ctxt *dlm = NULL;
mlog_entry_void();
+ if (ocfs2_mount_local(osb))
+ goto local;
+
status = ocfs2_dlm_init_debug(osb);
if (status < 0) {
mlog_errno(status);
@@ -2178,11 +2216,12 @@
goto bail;
}
+ dlm_register_eviction_cb(dlm, &osb->osb_eviction_cb);
+
+local:
ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb);
ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb);
- dlm_register_eviction_cb(dlm, &osb->osb_eviction_cb);
-
osb->dlm = dlm;
status = 0;