*/
#include <linux/slab.h>
-#include <linux/crc32.h>
#include <linux/kmod.h>
/* Needed for AOP_TRUNCATED_PAGE in mlog_errno() */
#include <linux/fs.h>
#include "cluster/masklog.h"
-#include "cluster/nodemanager.h"
-#include "cluster/heartbeat.h"
#include "stackglue.h"
-static struct ocfs2_locking_protocol *lproto;
-
-struct o2dlm_private {
- struct dlm_eviction_cb op_eviction_cb;
-};
-
-/* These should be identical */
-#if (DLM_LOCK_IV != LKM_IVMODE)
-# error Lock modes do not match
-#endif
-#if (DLM_LOCK_NL != LKM_NLMODE)
-# error Lock modes do not match
-#endif
-#if (DLM_LOCK_CR != LKM_CRMODE)
-# error Lock modes do not match
-#endif
-#if (DLM_LOCK_CW != LKM_CWMODE)
-# error Lock modes do not match
-#endif
-#if (DLM_LOCK_PR != LKM_PRMODE)
-# error Lock modes do not match
-#endif
-#if (DLM_LOCK_PW != LKM_PWMODE)
-# error Lock modes do not match
-#endif
-#if (DLM_LOCK_EX != LKM_EXMODE)
-# error Lock modes do not match
-#endif
-static inline int mode_to_o2dlm(int mode)
-{
- BUG_ON(mode > LKM_MAXMODE);
-
- return mode;
-}
-
-#define map_flag(_generic, _o2dlm) \
- if (flags & (_generic)) { \
- flags &= ~(_generic); \
- o2dlm_flags |= (_o2dlm); \
- }
-static int flags_to_o2dlm(u32 flags)
-{
- int o2dlm_flags = 0;
-
- map_flag(DLM_LKF_NOQUEUE, LKM_NOQUEUE);
- map_flag(DLM_LKF_CANCEL, LKM_CANCEL);
- map_flag(DLM_LKF_CONVERT, LKM_CONVERT);
- map_flag(DLM_LKF_VALBLK, LKM_VALBLK);
- map_flag(DLM_LKF_IVVALBLK, LKM_INVVALBLK);
- map_flag(DLM_LKF_ORPHAN, LKM_ORPHAN);
- map_flag(DLM_LKF_FORCEUNLOCK, LKM_FORCE);
- map_flag(DLM_LKF_TIMEOUT, LKM_TIMEOUT);
- map_flag(DLM_LKF_LOCAL, LKM_LOCAL);
-
- /* map_flag() should have cleared every flag passed in */
- BUG_ON(flags != 0);
-
- return o2dlm_flags;
-}
-#undef map_flag
-
-/*
- * Map an o2dlm status to standard errno values.
- *
- * o2dlm only uses a handful of these, and returns even fewer to the
- * caller. Still, we try to assign sane values to each error.
- *
- * The following value pairs have special meanings to dlmglue, thus
- * the right hand side needs to stay unique - never duplicate the
- * mapping elsewhere in the table!
- *
- * DLM_NORMAL: 0
- * DLM_NOTQUEUED: -EAGAIN
- * DLM_CANCELGRANT: -EBUSY
- * DLM_CANCEL: -DLM_ECANCEL
- */
-/* Keep in sync with dlmapi.h */
-static int status_map[] = {
- [DLM_NORMAL] = 0, /* Success */
- [DLM_GRANTED] = -EINVAL,
- [DLM_DENIED] = -EACCES,
- [DLM_DENIED_NOLOCKS] = -EACCES,
- [DLM_WORKING] = -EACCES,
- [DLM_BLOCKED] = -EINVAL,
- [DLM_BLOCKED_ORPHAN] = -EINVAL,
- [DLM_DENIED_GRACE_PERIOD] = -EACCES,
- [DLM_SYSERR] = -ENOMEM, /* It is what it is */
- [DLM_NOSUPPORT] = -EPROTO,
- [DLM_CANCELGRANT] = -EBUSY, /* Cancel after grant */
- [DLM_IVLOCKID] = -EINVAL,
- [DLM_SYNC] = -EINVAL,
- [DLM_BADTYPE] = -EINVAL,
- [DLM_BADRESOURCE] = -EINVAL,
- [DLM_MAXHANDLES] = -ENOMEM,
- [DLM_NOCLINFO] = -EINVAL,
- [DLM_NOLOCKMGR] = -EINVAL,
- [DLM_NOPURGED] = -EINVAL,
- [DLM_BADARGS] = -EINVAL,
- [DLM_VOID] = -EINVAL,
- [DLM_NOTQUEUED] = -EAGAIN, /* Trylock failed */
- [DLM_IVBUFLEN] = -EINVAL,
- [DLM_CVTUNGRANT] = -EPERM,
- [DLM_BADPARAM] = -EINVAL,
- [DLM_VALNOTVALID] = -EINVAL,
- [DLM_REJECTED] = -EPERM,
- [DLM_ABORT] = -EINVAL,
- [DLM_CANCEL] = -DLM_ECANCEL, /* Successful cancel */
- [DLM_IVRESHANDLE] = -EINVAL,
- [DLM_DEADLOCK] = -EDEADLK,
- [DLM_DENIED_NOASTS] = -EINVAL,
- [DLM_FORWARD] = -EINVAL,
- [DLM_TIMEOUT] = -ETIMEDOUT,
- [DLM_IVGROUPID] = -EINVAL,
- [DLM_VERS_CONFLICT] = -EOPNOTSUPP,
- [DLM_BAD_DEVICE_PATH] = -ENOENT,
- [DLM_NO_DEVICE_PERMISSION] = -EPERM,
- [DLM_NO_CONTROL_DEVICE] = -ENOENT,
- [DLM_RECOVERING] = -ENOTCONN,
- [DLM_MIGRATING] = -ERESTART,
- [DLM_MAXSTATS] = -EINVAL,
-};
-
-static int dlm_status_to_errno(enum dlm_status status)
-{
- BUG_ON(status > (sizeof(status_map) / sizeof(status_map[0])));
+struct ocfs2_locking_protocol *stack_glue_lproto;
- return status_map[status];
-}
-
-static void o2dlm_lock_ast_wrapper(void *astarg)
-{
- BUG_ON(lproto == NULL);
-
- lproto->lp_lock_ast(astarg);
-}
-
-static void o2dlm_blocking_ast_wrapper(void *astarg, int level)
-{
- BUG_ON(lproto == NULL);
-
- lproto->lp_blocking_ast(astarg, level);
-}
-
-static void o2dlm_unlock_ast_wrapper(void *astarg, enum dlm_status status)
-{
- int error = dlm_status_to_errno(status);
-
- BUG_ON(lproto == NULL);
-
- /*
- * In o2dlm, you can get both the lock_ast() for the lock being
- * granted and the unlock_ast() for the CANCEL failing. A
- * successful cancel sends DLM_NORMAL here. If the
- * lock grant happened before the cancel arrived, you get
- * DLM_CANCELGRANT.
- *
- * There's no need for the double-ast. If we see DLM_CANCELGRANT,
- * we just ignore it. We expect the lock_ast() to handle the
- * granted lock.
- */
- if (status == DLM_CANCELGRANT)
- return;
-
- lproto->lp_unlock_ast(astarg, error);
-}
-
-static int o2cb_dlm_lock(struct ocfs2_cluster_connection *conn,
- int mode,
- union ocfs2_dlm_lksb *lksb,
- u32 flags,
- void *name,
- unsigned int namelen,
- void *astarg)
-{
- enum dlm_status status;
- int o2dlm_mode = mode_to_o2dlm(mode);
- int o2dlm_flags = flags_to_o2dlm(flags);
- int ret;
-
- status = dlmlock(conn->cc_lockspace, o2dlm_mode, &lksb->lksb_o2dlm,
- o2dlm_flags, name, namelen,
- o2dlm_lock_ast_wrapper, astarg,
- o2dlm_blocking_ast_wrapper);
- ret = dlm_status_to_errno(status);
- return ret;
-}
int ocfs2_dlm_lock(struct ocfs2_cluster_connection *conn,
int mode,
unsigned int namelen,
void *astarg)
{
- BUG_ON(lproto == NULL);
-
- return o2cb_dlm_lock(conn, mode, lksb, flags,
- name, namelen, astarg);
-}
-
-static int o2cb_dlm_unlock(struct ocfs2_cluster_connection *conn,
- union ocfs2_dlm_lksb *lksb,
- u32 flags,
- void *astarg)
-{
- enum dlm_status status;
- int o2dlm_flags = flags_to_o2dlm(flags);
- int ret;
+ BUG_ON(stack_glue_lproto == NULL);
- status = dlmunlock(conn->cc_lockspace, &lksb->lksb_o2dlm,
- o2dlm_flags, o2dlm_unlock_ast_wrapper, astarg);
- ret = dlm_status_to_errno(status);
- return ret;
+ return o2cb_stack_ops.dlm_lock(conn, mode, lksb, flags,
+ name, namelen, astarg);
}
int ocfs2_dlm_unlock(struct ocfs2_cluster_connection *conn,
u32 flags,
void *astarg)
{
- BUG_ON(lproto == NULL);
+ BUG_ON(stack_glue_lproto == NULL);
- return o2cb_dlm_unlock(conn, lksb, flags, astarg);
-}
-
-static int o2cb_dlm_lock_status(union ocfs2_dlm_lksb *lksb)
-{
- return dlm_status_to_errno(lksb->lksb_o2dlm.status);
+ return o2cb_stack_ops.dlm_unlock(conn, lksb, flags, astarg);
}
int ocfs2_dlm_lock_status(union ocfs2_dlm_lksb *lksb)
{
- return o2cb_dlm_lock_status(lksb);
+ return o2cb_stack_ops.lock_status(lksb);
}
/*
* don't cast at the glue level. The real answer is that the header
* ordering is nigh impossible.
*/
-static void *o2cb_dlm_lvb(union ocfs2_dlm_lksb *lksb)
-{
- return (void *)(lksb->lksb_o2dlm.lvb);
-}
-
void *ocfs2_dlm_lvb(union ocfs2_dlm_lksb *lksb)
{
- return o2cb_dlm_lvb(lksb);
-}
-
-static void o2cb_dlm_dump_lksb(union ocfs2_dlm_lksb *lksb)
-{
- dlm_print_one_lock(lksb->lksb_o2dlm.lockid);
+ return o2cb_stack_ops.lock_lvb(lksb);
}
void ocfs2_dlm_dump_lksb(union ocfs2_dlm_lksb *lksb)
{
- o2cb_dlm_dump_lksb(lksb);
-}
-
-/*
- * Called from the dlm when it's about to evict a node. This is how the
- * classic stack signals node death.
- */
-static void o2dlm_eviction_cb(int node_num, void *data)
-{
- struct ocfs2_cluster_connection *conn = data;
-
- mlog(ML_NOTICE, "o2dlm has evicted node %d from group %.*s\n",
- node_num, conn->cc_namelen, conn->cc_name);
-
- conn->cc_recovery_handler(node_num, conn->cc_recovery_data);
-}
-
-static int o2cb_cluster_connect(struct ocfs2_cluster_connection *conn)
-{
- int rc = 0;
- u32 dlm_key;
- struct dlm_ctxt *dlm;
- struct o2dlm_private *priv;
- struct dlm_protocol_version dlm_version;
-
- BUG_ON(conn == NULL);
-
- /* for now we only have one cluster/node, make sure we see it
- * in the heartbeat universe */
- if (!o2hb_check_local_node_heartbeating()) {
- rc = -EINVAL;
- goto out;
- }
-
- priv = kzalloc(sizeof(struct o2dlm_private), GFP_KERNEL);
- if (!priv) {
- rc = -ENOMEM;
- goto out_free;
- }
-
- /* This just fills the structure in. It is safe to pass conn. */
- dlm_setup_eviction_cb(&priv->op_eviction_cb, o2dlm_eviction_cb,
- conn);
-
- conn->cc_private = priv;
-
- /* used by the dlm code to make message headers unique, each
- * node in this domain must agree on this. */
- dlm_key = crc32_le(0, conn->cc_name, conn->cc_namelen);
- dlm_version.pv_major = conn->cc_version.pv_major;
- dlm_version.pv_minor = conn->cc_version.pv_minor;
-
- dlm = dlm_register_domain(conn->cc_name, dlm_key, &dlm_version);
- if (IS_ERR(dlm)) {
- rc = PTR_ERR(dlm);
- mlog_errno(rc);
- goto out_free;
- }
-
- conn->cc_version.pv_major = dlm_version.pv_major;
- conn->cc_version.pv_minor = dlm_version.pv_minor;
- conn->cc_lockspace = dlm;
-
- dlm_register_eviction_cb(dlm, &priv->op_eviction_cb);
-
-out_free:
- if (rc && conn->cc_private)
- kfree(conn->cc_private);
-
-out:
- return rc;
+ o2cb_stack_ops.dump_lksb(lksb);
}
int ocfs2_cluster_connect(const char *group,
new_conn->cc_recovery_data = recovery_data;
/* Start the new connection at our maximum compatibility level */
- new_conn->cc_version = lproto->lp_max_version;
+ new_conn->cc_version = stack_glue_lproto->lp_max_version;
- rc = o2cb_cluster_connect(new_conn);
+ rc = o2cb_stack_ops.connect(new_conn);
if (rc) {
mlog_errno(rc);
goto out_free;
return rc;
}
-
-static int o2cb_cluster_disconnect(struct ocfs2_cluster_connection *conn)
-{
- struct dlm_ctxt *dlm = conn->cc_lockspace;
- struct o2dlm_private *priv = conn->cc_private;
-
- dlm_unregister_eviction_cb(&priv->op_eviction_cb);
- conn->cc_private = NULL;
- kfree(priv);
-
- dlm_unregister_domain(dlm);
- conn->cc_lockspace = NULL;
-
- return 0;
-}
-
int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn)
{
int ret;
BUG_ON(conn == NULL);
- ret = o2cb_cluster_disconnect(conn);
+ ret = o2cb_stack_ops.disconnect(conn);
/* XXX Should we free it anyway? */
if (!ret)
return ret;
}
-static void o2hb_stop(const char *group)
-{
- int ret;
- char *argv[5], *envp[3];
-
- argv[0] = (char *)o2nm_get_hb_ctl_path();
- argv[1] = "-K";
- argv[2] = "-u";
- argv[3] = (char *)group;
- argv[4] = NULL;
-
- mlog(0, "Run: %s %s %s %s\n", argv[0], argv[1], argv[2], argv[3]);
-
- /* minimal command environment taken from cpu_run_sbin_hotplug */
- envp[0] = "HOME=/";
- envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
- envp[2] = NULL;
-
- ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
- if (ret < 0)
- mlog_errno(ret);
-}
-
-/*
- * Hangup is a hack for tools compatibility. Older ocfs2-tools software
- * expects the filesystem to call "ocfs2_hb_ctl" during unmount. This
- * happens regardless of whether the DLM got started, so we can't do it
- * in ocfs2_cluster_disconnect(). We bring the o2hb_stop() function into
- * the glue and provide a "hangup" API for super.c to call.
- *
- * Other stacks will eventually provide a NULL ->hangup() pointer.
- */
-static void o2cb_cluster_hangup(const char *group, int grouplen)
-{
- o2hb_stop(group);
-}
-
void ocfs2_cluster_hangup(const char *group, int grouplen)
{
BUG_ON(group == NULL);
BUG_ON(group[grouplen] != '\0');
- o2cb_cluster_hangup(group, grouplen);
-}
-
-static int o2cb_cluster_this_node(unsigned int *node)
-{
- int node_num;
-
- node_num = o2nm_this_node();
- if (node_num == O2NM_INVALID_NODE_NUM)
- return -ENOENT;
-
- if (node_num >= O2NM_MAX_NODES)
- return -EOVERFLOW;
-
- *node = node_num;
- return 0;
+ o2cb_stack_ops.hangup(group, grouplen);
}
int ocfs2_cluster_this_node(unsigned int *node)
{
- return o2cb_cluster_this_node(node);
+ return o2cb_stack_ops.this_node(node);
}
void ocfs2_stack_glue_set_locking_protocol(struct ocfs2_locking_protocol *proto)
{
BUG_ON(proto != NULL);
- lproto = proto;
+ stack_glue_lproto = proto;
}
projects / linux-2.6-omap-h63xx.git / blobdiff