#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/mm.h>
-#include <linux/smp_lock.h>
-#include <linux/crc32.h>
#include <linux/kthread.h>
#include <linux/pagemap.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
-
-#include <cluster/heartbeat.h>
-#include <cluster/nodemanager.h>
-#include <cluster/tcp.h>
-
-#include <dlm/dlmapi.h>
+#include <linux/time.h>
+#include <linux/quotaops.h>
#define MLOG_MASK_PREFIX ML_DLM_GLUE
#include <cluster/masklog.h>
#include "ocfs2.h"
+#include "ocfs2_lockingver.h"
#include "alloc.h"
#include "dcache.h"
#include "dlmglue.h"
#include "extent_map.h"
+#include "file.h"
#include "heartbeat.h"
#include "inode.h"
#include "journal.h"
+#include "stackglue.h"
#include "slot_map.h"
#include "super.h"
#include "uptodate.h"
-#include "vote.h"
+#include "quota.h"
+#include "refcounttree.h"
#include "buffer_head_io.h"
struct completion mw_complete;
unsigned long mw_mask;
unsigned long mw_goal;
+#ifdef CONFIG_OCFS2_FS_STATS
+ unsigned long long mw_lock_start;
+#endif
};
static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres);
static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres);
+static struct ocfs2_super *ocfs2_get_file_osb(struct ocfs2_lock_res *lockres);
+static struct ocfs2_super *ocfs2_get_qinfo_osb(struct ocfs2_lock_res *lockres);
/*
- * Return value from ocfs2_convert_worker_t functions.
+ * Return value from ->downconvert_worker functions.
*
- * These control the precise actions of ocfs2_generic_unblock_lock()
+ * These control the precise actions of ocfs2_unblock_lock()
* and ocfs2_process_blocked_lock()
*
*/
enum ocfs2_unblock_action unblock_action;
};
-static int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres,
- struct ocfs2_unblock_ctl *ctl);
-static int ocfs2_unblock_data(struct ocfs2_lock_res *lockres,
- struct ocfs2_unblock_ctl *ctl);
-static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres,
- struct ocfs2_unblock_ctl *ctl);
-static int ocfs2_unblock_dentry_lock(struct ocfs2_lock_res *lockres,
- struct ocfs2_unblock_ctl *ctl);
-static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres,
- struct ocfs2_unblock_ctl *ctl);
+/* Lockdep class keys */
+struct lock_class_key lockdep_keys[OCFS2_NUM_LOCK_TYPES];
+
+static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres,
+ int new_level);
+static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres);
+
+static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
+ int blocking);
+
+static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres,
+ int blocking);
static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb,
struct ocfs2_lock_res *lockres);
+static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres);
+
+static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres,
+ int new_level);
+static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres,
+ int blocking);
+
+#define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres)
+
+/* This aids in debugging situations where a bad LVB might be involved. */
+static void ocfs2_dump_meta_lvb_info(u64 level,
+ const char *function,
+ unsigned int line,
+ struct ocfs2_lock_res *lockres)
+{
+ struct ocfs2_meta_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
+
+ mlog(level, "LVB information for %s (called from %s:%u):\n",
+ lockres->l_name, function, line);
+ mlog(level, "version: %u, clusters: %u, generation: 0x%x\n",
+ lvb->lvb_version, be32_to_cpu(lvb->lvb_iclusters),
+ be32_to_cpu(lvb->lvb_igeneration));
+ mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n",
+ (unsigned long long)be64_to_cpu(lvb->lvb_isize),
+ be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid),
+ be16_to_cpu(lvb->lvb_imode));
+ mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, "
+ "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink),
+ (long long)be64_to_cpu(lvb->lvb_iatime_packed),
+ (long long)be64_to_cpu(lvb->lvb_ictime_packed),
+ (long long)be64_to_cpu(lvb->lvb_imtime_packed),
+ be32_to_cpu(lvb->lvb_iattr));
+}
+
+
/*
* OCFS2 Lock Resource Operations
*
* These fine tune the behavior of the generic dlmglue locking infrastructure.
+ *
+ * The most basic of lock types can point ->l_priv to their respective
+ * struct ocfs2_super and allow the default actions to manage things.
+ *
+ * Right now, each lock type also needs to implement an init function,
+ * and trivial lock/unlock wrappers. ocfs2_simple_drop_lockres()
+ * should be called when the lock is no longer needed (i.e., object
+ * destruction time).
*/
struct ocfs2_lock_res_ops {
/*
* this callback if ->l_priv is not an ocfs2_super pointer
*/
struct ocfs2_super * (*get_osb)(struct ocfs2_lock_res *);
- int (*unblock)(struct ocfs2_lock_res *, struct ocfs2_unblock_ctl *);
+
+ /*
+ * Optionally called in the downconvert thread after a
+ * successful downconvert. The lockres will not be referenced
+ * after this callback is called, so it is safe to free
+ * memory, etc.
+ *
+ * The exact semantics of when this is called are controlled
+ * by ->downconvert_worker()
+ */
void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *);
/*
+ * Allow a lock type to add checks to determine whether it is
+ * safe to downconvert a lock. Return 0 to re-queue the
+ * downconvert at a later time, nonzero to continue.
+ *
+ * For most locks, the default checks that there are no
+ * incompatible holders are sufficient.
+ *
+ * Called with the lockres spinlock held.
+ */
+ int (*check_downconvert)(struct ocfs2_lock_res *, int);
+
+ /*
+ * Allows a lock type to populate the lock value block. This
+ * is called on downconvert, and when we drop a lock.
+ *
+ * Locks that want to use this should set LOCK_TYPE_USES_LVB
+ * in the flags field.
+ *
+ * Called with the lockres spinlock held.
+ */
+ void (*set_lvb)(struct ocfs2_lock_res *);
+
+ /*
+ * Called from the downconvert thread when it is determined
+ * that a lock will be downconverted. This is called without
+ * any locks held so the function can do work that might
+ * schedule (syncing out data, etc).
+ *
+ * This should return any one of the ocfs2_unblock_action
+ * values, depending on what it wants the thread to do.
+ */
+ int (*downconvert_worker)(struct ocfs2_lock_res *, int);
+
+ /*
* LOCK_TYPE_* flags which describe the specific requirements
* of a lock type. Descriptions of each individual flag follow.
*/
#define LOCK_TYPE_REQUIRES_REFRESH 0x1
/*
- * Indicate that a lock type makes use of the lock value block.
+ * Indicate that a lock type makes use of the lock value block. The
+ * ->set_lvb lock type callback must be defined.
*/
#define LOCK_TYPE_USES_LVB 0x2
-typedef int (ocfs2_convert_worker_t)(struct ocfs2_lock_res *, int);
-static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb,
- struct ocfs2_lock_res *lockres,
- struct ocfs2_unblock_ctl *ctl,
- ocfs2_convert_worker_t *worker);
-
static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = {
.get_osb = ocfs2_get_inode_osb,
- .unblock = ocfs2_unblock_inode_lock,
.flags = 0,
};
-static struct ocfs2_lock_res_ops ocfs2_inode_meta_lops = {
+static struct ocfs2_lock_res_ops ocfs2_inode_inode_lops = {
.get_osb = ocfs2_get_inode_osb,
- .unblock = ocfs2_unblock_meta,
+ .check_downconvert = ocfs2_check_meta_downconvert,
+ .set_lvb = ocfs2_set_meta_lvb,
+ .downconvert_worker = ocfs2_data_convert_worker,
.flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB,
};
-static struct ocfs2_lock_res_ops ocfs2_inode_data_lops = {
- .get_osb = ocfs2_get_inode_osb,
- .unblock = ocfs2_unblock_data,
- .flags = 0,
-};
-
static struct ocfs2_lock_res_ops ocfs2_super_lops = {
- .unblock = ocfs2_unblock_osb_lock,
.flags = LOCK_TYPE_REQUIRES_REFRESH,
};
static struct ocfs2_lock_res_ops ocfs2_rename_lops = {
- .unblock = ocfs2_unblock_osb_lock,
.flags = 0,
};
+static struct ocfs2_lock_res_ops ocfs2_nfs_sync_lops = {
+ .flags = 0,
+};
+
+static struct ocfs2_lock_res_ops ocfs2_orphan_scan_lops = {
+ .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB,
+};
+
static struct ocfs2_lock_res_ops ocfs2_dentry_lops = {
.get_osb = ocfs2_get_dentry_osb,
- .unblock = ocfs2_unblock_dentry_lock,
.post_unlock = ocfs2_dentry_post_unlock,
+ .downconvert_worker = ocfs2_dentry_convert_worker,
+ .flags = 0,
+};
+
+static struct ocfs2_lock_res_ops ocfs2_inode_open_lops = {
+ .get_osb = ocfs2_get_inode_osb,
+ .flags = 0,
+};
+
+static struct ocfs2_lock_res_ops ocfs2_flock_lops = {
+ .get_osb = ocfs2_get_file_osb,
+ .flags = 0,
+};
+
+static struct ocfs2_lock_res_ops ocfs2_qinfo_lops = {
+ .set_lvb = ocfs2_set_qinfo_lvb,
+ .get_osb = ocfs2_get_qinfo_osb,
+ .flags = LOCK_TYPE_REQUIRES_REFRESH | LOCK_TYPE_USES_LVB,
+};
+
+static struct ocfs2_lock_res_ops ocfs2_refcount_block_lops = {
+ .check_downconvert = ocfs2_check_refcount_downconvert,
+ .downconvert_worker = ocfs2_refcount_convert_worker,
.flags = 0,
};
static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres)
{
return lockres->l_type == OCFS2_LOCK_TYPE_META ||
- lockres->l_type == OCFS2_LOCK_TYPE_DATA ||
- lockres->l_type == OCFS2_LOCK_TYPE_RW;
+ lockres->l_type == OCFS2_LOCK_TYPE_RW ||
+ lockres->l_type == OCFS2_LOCK_TYPE_OPEN;
}
static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres)
return (struct ocfs2_dentry_lock *)lockres->l_priv;
}
+static inline struct ocfs2_mem_dqinfo *ocfs2_lock_res_qinfo(struct ocfs2_lock_res *lockres)
+{
+ BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_QINFO);
+
+ return (struct ocfs2_mem_dqinfo *)lockres->l_priv;
+}
+
+static inline struct ocfs2_refcount_tree *
+ocfs2_lock_res_refcount_tree(struct ocfs2_lock_res *res)
+{
+ return container_of(res, struct ocfs2_refcount_tree, rf_lockres);
+}
+
static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres)
{
if (lockres->l_ops->get_osb)
static int ocfs2_lock_create(struct ocfs2_super *osb,
struct ocfs2_lock_res *lockres,
int level,
- int dlm_flags);
+ u32 dlm_flags);
static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres,
int wanted);
-static void ocfs2_cluster_unlock(struct ocfs2_super *osb,
- struct ocfs2_lock_res *lockres,
- int level);
+static void __ocfs2_cluster_unlock(struct ocfs2_super *osb,
+ struct ocfs2_lock_res *lockres,
+ int level, unsigned long caller_ip);
+static inline void ocfs2_cluster_unlock(struct ocfs2_super *osb,
+ struct ocfs2_lock_res *lockres,
+ int level)
+{
+ __ocfs2_cluster_unlock(osb, lockres, level, _RET_IP_);
+}
+
static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres);
static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres);
static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres);
struct ocfs2_lock_res *lockres);
static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
int convert);
-#define ocfs2_log_dlm_error(_func, _stat, _lockres) do { \
- mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \
- "resource %s: %s\n", dlm_errname(_stat), _func, \
- _lockres->l_name, dlm_errmsg(_stat)); \
+#define ocfs2_log_dlm_error(_func, _err, _lockres) do { \
+ if ((_lockres)->l_type != OCFS2_LOCK_TYPE_DENTRY) \
+ mlog(ML_ERROR, "DLM error %d while calling %s on resource %s\n", \
+ _err, _func, _lockres->l_name); \
+ else \
+ mlog(ML_ERROR, "DLM error %d while calling %s on resource %.*s%08x\n", \
+ _err, _func, OCFS2_DENTRY_LOCK_INO_START - 1, (_lockres)->l_name, \
+ (unsigned int)ocfs2_get_dentry_lock_ino(_lockres)); \
} while (0)
-static void ocfs2_vote_on_unlock(struct ocfs2_super *osb,
- struct ocfs2_lock_res *lockres);
-static int ocfs2_meta_lock_update(struct inode *inode,
+static int ocfs2_downconvert_thread(void *arg);
+static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb,
+ struct ocfs2_lock_res *lockres);
+static int ocfs2_inode_lock_update(struct inode *inode,
struct buffer_head **bh);
static void ocfs2_drop_osb_locks(struct ocfs2_super *osb);
static inline int ocfs2_highest_compat_lock_level(int level);
-static inline int ocfs2_can_downconvert_meta_lock(struct inode *inode,
- struct ocfs2_lock_res *lockres,
- int new_level);
+static unsigned int ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres,
+ int new_level);
+static int ocfs2_downconvert_lock(struct ocfs2_super *osb,
+ struct ocfs2_lock_res *lockres,
+ int new_level,
+ int lvb,
+ unsigned int generation);
+static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb,
+ struct ocfs2_lock_res *lockres);
+static int ocfs2_cancel_convert(struct ocfs2_super *osb,
+ struct ocfs2_lock_res *lockres);
+
static void ocfs2_build_lock_name(enum ocfs2_lock_type type,
u64 blkno,
spin_unlock(&ocfs2_dlm_tracking_lock);
}
+#ifdef CONFIG_OCFS2_FS_STATS
+static void ocfs2_init_lock_stats(struct ocfs2_lock_res *res)
+{
+ res->l_lock_num_prmode = 0;
+ res->l_lock_num_prmode_failed = 0;
+ res->l_lock_total_prmode = 0;
+ res->l_lock_max_prmode = 0;
+ res->l_lock_num_exmode = 0;
+ res->l_lock_num_exmode_failed = 0;
+ res->l_lock_total_exmode = 0;
+ res->l_lock_max_exmode = 0;
+ res->l_lock_refresh = 0;
+}
+
+static void ocfs2_update_lock_stats(struct ocfs2_lock_res *res, int level,
+ struct ocfs2_mask_waiter *mw, int ret)
+{
+ unsigned long long *num, *sum;
+ unsigned int *max, *failed;
+ struct timespec ts = current_kernel_time();
+ unsigned long long time = timespec_to_ns(&ts) - mw->mw_lock_start;
+
+ if (level == LKM_PRMODE) {
+ num = &res->l_lock_num_prmode;
+ sum = &res->l_lock_total_prmode;
+ max = &res->l_lock_max_prmode;
+ failed = &res->l_lock_num_prmode_failed;
+ } else if (level == LKM_EXMODE) {
+ num = &res->l_lock_num_exmode;
+ sum = &res->l_lock_total_exmode;
+ max = &res->l_lock_max_exmode;
+ failed = &res->l_lock_num_exmode_failed;
+ } else
+ return;
+
+ (*num)++;
+ (*sum) += time;
+ if (time > *max)
+ *max = time;
+ if (ret)
+ (*failed)++;
+}
+
+static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres)
+{
+ lockres->l_lock_refresh++;
+}
+
+static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw)
+{
+ struct timespec ts = current_kernel_time();
+ mw->mw_lock_start = timespec_to_ns(&ts);
+}
+#else
+static inline void ocfs2_init_lock_stats(struct ocfs2_lock_res *res)
+{
+}
+static inline void ocfs2_update_lock_stats(struct ocfs2_lock_res *res,
+ int level, struct ocfs2_mask_waiter *mw, int ret)
+{
+}
+static inline void ocfs2_track_lock_refresh(struct ocfs2_lock_res *lockres)
+{
+}
+static inline void ocfs2_init_start_time(struct ocfs2_mask_waiter *mw)
+{
+}
+#endif
+
static void ocfs2_lock_res_init_common(struct ocfs2_super *osb,
struct ocfs2_lock_res *res,
enum ocfs2_lock_type type,
res->l_ops = ops;
res->l_priv = priv;
- res->l_level = LKM_IVMODE;
- res->l_requested = LKM_IVMODE;
- res->l_blocking = LKM_IVMODE;
+ res->l_level = DLM_LOCK_IV;
+ res->l_requested = DLM_LOCK_IV;
+ res->l_blocking = DLM_LOCK_IV;
res->l_action = OCFS2_AST_INVALID;
res->l_unlock_action = OCFS2_UNLOCK_INVALID;
res->l_flags = OCFS2_LOCK_INITIALIZED;
ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug);
+
+ ocfs2_init_lock_stats(res);
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ if (type != OCFS2_LOCK_TYPE_OPEN)
+ lockdep_init_map(&res->l_lockdep_map, ocfs2_lock_type_strings[type],
+ &lockdep_keys[type], 0);
+ else
+ res->l_lockdep_map.key = NULL;
+#endif
}
void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res)
ops = &ocfs2_inode_rw_lops;
break;
case OCFS2_LOCK_TYPE_META:
- ops = &ocfs2_inode_meta_lops;
+ ops = &ocfs2_inode_inode_lops;
break;
- case OCFS2_LOCK_TYPE_DATA:
- ops = &ocfs2_inode_data_lops;
+ case OCFS2_LOCK_TYPE_OPEN:
+ ops = &ocfs2_inode_open_lops;
break;
default:
mlog_bug_on_msg(1, "type: %d\n", type);
return OCFS2_SB(inode->i_sb);
}
+static struct ocfs2_super *ocfs2_get_qinfo_osb(struct ocfs2_lock_res *lockres)
+{
+ struct ocfs2_mem_dqinfo *info = lockres->l_priv;
+
+ return OCFS2_SB(info->dqi_gi.dqi_sb);
+}
+
+static struct ocfs2_super *ocfs2_get_file_osb(struct ocfs2_lock_res *lockres)
+{
+ struct ocfs2_file_private *fp = lockres->l_priv;
+
+ return OCFS2_SB(fp->fp_file->f_mapping->host->i_sb);
+}
+
static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres)
{
__be64 inode_blkno_be;
&ocfs2_rename_lops, osb);
}
+static void ocfs2_nfs_sync_lock_res_init(struct ocfs2_lock_res *res,
+ struct ocfs2_super *osb)
+{
+ /* nfs_sync lockres doesn't come from a slab so we call init
+ * once on it manually. */
+ ocfs2_lock_res_init_once(res);
+ ocfs2_build_lock_name(OCFS2_LOCK_TYPE_NFS_SYNC, 0, 0, res->l_name);
+ ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_NFS_SYNC,
+ &ocfs2_nfs_sync_lops, osb);
+}
+
+static void ocfs2_orphan_scan_lock_res_init(struct ocfs2_lock_res *res,
+ struct ocfs2_super *osb)
+{
+ ocfs2_lock_res_init_once(res);
+ ocfs2_build_lock_name(OCFS2_LOCK_TYPE_ORPHAN_SCAN, 0, 0, res->l_name);
+ ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_ORPHAN_SCAN,
+ &ocfs2_orphan_scan_lops, osb);
+}
+
+void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres,
+ struct ocfs2_file_private *fp)
+{
+ struct inode *inode = fp->fp_file->f_mapping->host;
+ struct ocfs2_inode_info *oi = OCFS2_I(inode);
+
+ ocfs2_lock_res_init_once(lockres);
+ ocfs2_build_lock_name(OCFS2_LOCK_TYPE_FLOCK, oi->ip_blkno,
+ inode->i_generation, lockres->l_name);
+ ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres,
+ OCFS2_LOCK_TYPE_FLOCK, &ocfs2_flock_lops,
+ fp);
+ lockres->l_flags |= OCFS2_LOCK_NOCACHE;
+}
+
+void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res *lockres,
+ struct ocfs2_mem_dqinfo *info)
+{
+ ocfs2_lock_res_init_once(lockres);
+ ocfs2_build_lock_name(OCFS2_LOCK_TYPE_QINFO, info->dqi_gi.dqi_type,
+ 0, lockres->l_name);
+ ocfs2_lock_res_init_common(OCFS2_SB(info->dqi_gi.dqi_sb), lockres,
+ OCFS2_LOCK_TYPE_QINFO, &ocfs2_qinfo_lops,
+ info);
+}
+
+void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres,
+ struct ocfs2_super *osb, u64 ref_blkno,
+ unsigned int generation)
+{
+ ocfs2_lock_res_init_once(lockres);
+ ocfs2_build_lock_name(OCFS2_LOCK_TYPE_REFCOUNT, ref_blkno,
+ generation, lockres->l_name);
+ ocfs2_lock_res_init_common(osb, lockres, OCFS2_LOCK_TYPE_REFCOUNT,
+ &ocfs2_refcount_block_lops, osb);
+}
+
void ocfs2_lock_res_free(struct ocfs2_lock_res *res)
{
mlog_entry_void();
BUG_ON(!lockres);
switch(level) {
- case LKM_EXMODE:
+ case DLM_LOCK_EX:
lockres->l_ex_holders++;
break;
- case LKM_PRMODE:
+ case DLM_LOCK_PR:
lockres->l_ro_holders++;
break;
default:
BUG_ON(!lockres);
switch(level) {
- case LKM_EXMODE:
+ case DLM_LOCK_EX:
BUG_ON(!lockres->l_ex_holders);
lockres->l_ex_holders--;
break;
- case LKM_PRMODE:
+ case DLM_LOCK_PR:
BUG_ON(!lockres->l_ro_holders);
lockres->l_ro_holders--;
break;
* lock types are added. */
static inline int ocfs2_highest_compat_lock_level(int level)
{
- int new_level = LKM_EXMODE;
+ int new_level = DLM_LOCK_EX;
- if (level == LKM_EXMODE)
- new_level = LKM_NLMODE;
- else if (level == LKM_PRMODE)
- new_level = LKM_PRMODE;
+ if (level == DLM_LOCK_EX)
+ new_level = DLM_LOCK_NL;
+ else if (level == DLM_LOCK_PR)
+ new_level = DLM_LOCK_PR;
return new_level;
}
static void lockres_set_flags(struct ocfs2_lock_res *lockres,
unsigned long newflags)
{
- struct list_head *pos, *tmp;
- struct ocfs2_mask_waiter *mw;
+ struct ocfs2_mask_waiter *mw, *tmp;
assert_spin_locked(&lockres->l_lock);
lockres->l_flags = newflags;
- list_for_each_safe(pos, tmp, &lockres->l_mask_waiters) {
- mw = list_entry(pos, struct ocfs2_mask_waiter, mw_item);
+ list_for_each_entry_safe(mw, tmp, &lockres->l_mask_waiters, mw_item) {
if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal)
continue;
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY));
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED));
BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
- BUG_ON(lockres->l_blocking <= LKM_NLMODE);
+ BUG_ON(lockres->l_blocking <= DLM_LOCK_NL);
lockres->l_level = lockres->l_requested;
if (lockres->l_level <=
ocfs2_highest_compat_lock_level(lockres->l_blocking)) {
- lockres->l_blocking = LKM_NLMODE;
+ lockres->l_blocking = DLM_LOCK_NL;
lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED);
}
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
* information is already up to data. Convert from NL to
* *anything* however should mark ourselves as needing an
* update */
- if (lockres->l_level == LKM_NLMODE &&
+ if (lockres->l_level == DLM_LOCK_NL &&
lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
{
mlog_entry_void();
- BUG_ON((!lockres->l_flags & OCFS2_LOCK_BUSY));
+ BUG_ON((!(lockres->l_flags & OCFS2_LOCK_BUSY)));
BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED);
- if (lockres->l_requested > LKM_NLMODE &&
+ if (lockres->l_requested > DLM_LOCK_NL &&
!(lockres->l_flags & OCFS2_LOCK_LOCAL) &&
lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
return needs_downconvert;
}
+/*
+ * OCFS2_LOCK_PENDING and l_pending_gen.
+ *
+ * Why does OCFS2_LOCK_PENDING exist? To close a race between setting
+ * OCFS2_LOCK_BUSY and calling ocfs2_dlm_lock(). See ocfs2_unblock_lock()
+ * for more details on the race.
+ *
+ * OCFS2_LOCK_PENDING closes the race quite nicely. However, it introduces
+ * a race on itself. In o2dlm, we can get the ast before ocfs2_dlm_lock()
+ * returns. The ast clears OCFS2_LOCK_BUSY, and must therefore clear
+ * OCFS2_LOCK_PENDING at the same time. When ocfs2_dlm_lock() returns,
+ * the caller is going to try to clear PENDING again. If nothing else is
+ * happening, __lockres_clear_pending() sees PENDING is unset and does
+ * nothing.
+ *
+ * But what if another path (eg downconvert thread) has just started a
+ * new locking action? The other path has re-set PENDING. Our path
+ * cannot clear PENDING, because that will re-open the original race
+ * window.
+ *
+ * [Example]
+ *
+ * ocfs2_meta_lock()
+ * ocfs2_cluster_lock()
+ * set BUSY
+ * set PENDING
+ * drop l_lock
+ * ocfs2_dlm_lock()
+ * ocfs2_locking_ast() ocfs2_downconvert_thread()
+ * clear PENDING ocfs2_unblock_lock()
+ * take_l_lock
+ * !BUSY
+ * ocfs2_prepare_downconvert()
+ * set BUSY
+ * set PENDING
+ * drop l_lock
+ * take l_lock
+ * clear PENDING
+ * drop l_lock
+ * <window>
+ * ocfs2_dlm_lock()
+ *
+ * So as you can see, we now have a window where l_lock is not held,
+ * PENDING is not set, and ocfs2_dlm_lock() has not been called.
+ *
+ * The core problem is that ocfs2_cluster_lock() has cleared the PENDING
+ * set by ocfs2_prepare_downconvert(). That wasn't nice.
+ *
+ * To solve this we introduce l_pending_gen. A call to
+ * lockres_clear_pending() will only do so when it is passed a generation
+ * number that matches the lockres. lockres_set_pending() will return the
+ * current generation number. When ocfs2_cluster_lock() goes to clear
+ * PENDING, it passes the generation it got from set_pending(). In our
+ * example above, the generation numbers will *not* match. Thus,
+ * ocfs2_cluster_lock() will not clear the PENDING set by
+ * ocfs2_prepare_downconvert().
+ */
+
+/* Unlocked version for ocfs2_locking_ast() */
+static void __lockres_clear_pending(struct ocfs2_lock_res *lockres,
+ unsigned int generation,
+ struct ocfs2_super *osb)
+{
+ assert_spin_locked(&lockres->l_lock);
+
+ /*
+ * The ast and locking functions can race us here. The winner
+ * will clear pending, the loser will not.
+ */
+ if (!(lockres->l_flags & OCFS2_LOCK_PENDING) ||
+ (lockres->l_pending_gen != generation))
+ return;
+
+ lockres_clear_flags(lockres, OCFS2_LOCK_PENDING);
+ lockres->l_pending_gen++;
+
+ /*
+ * The downconvert thread may have skipped us because we
+ * were PENDING. Wake it up.
+ */
+ if (lockres->l_flags & OCFS2_LOCK_BLOCKED)
+ ocfs2_wake_downconvert_thread(osb);
+}
+
+/* Locked version for callers of ocfs2_dlm_lock() */
+static void lockres_clear_pending(struct ocfs2_lock_res *lockres,
+ unsigned int generation,
+ struct ocfs2_super *osb)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&lockres->l_lock, flags);
+ __lockres_clear_pending(lockres, generation, osb);
+ spin_unlock_irqrestore(&lockres->l_lock, flags);
+}
+
+static unsigned int lockres_set_pending(struct ocfs2_lock_res *lockres)
+{
+ assert_spin_locked(&lockres->l_lock);
+ BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY));
+
+ lockres_or_flags(lockres, OCFS2_LOCK_PENDING);
+
+ return lockres->l_pending_gen;
+}
+
+
static void ocfs2_blocking_ast(void *opaque, int level)
{
struct ocfs2_lock_res *lockres = opaque;
int needs_downconvert;
unsigned long flags;
- BUG_ON(level <= LKM_NLMODE);
+ BUG_ON(level <= DLM_LOCK_NL);
mlog(0, "BAST fired for lockres %s, blocking %d, level %d type %s\n",
lockres->l_name, level, lockres->l_level,
ocfs2_lock_type_string(lockres->l_type));
+ /*
+ * We can skip the bast for locks which don't enable caching -
+ * they'll be dropped at the earliest possible time anyway.
+ */
+ if (lockres->l_flags & OCFS2_LOCK_NOCACHE)
+ return;
+
spin_lock_irqsave(&lockres->l_lock, flags);
needs_downconvert = ocfs2_generic_handle_bast(lockres, level);
if (needs_downconvert)
wake_up(&lockres->l_event);
- ocfs2_kick_vote_thread(osb);
+ ocfs2_wake_downconvert_thread(osb);
}
static void ocfs2_locking_ast(void *opaque)
{
struct ocfs2_lock_res *lockres = opaque;
- struct dlm_lockstatus *lksb = &lockres->l_lksb;
+ struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres);
unsigned long flags;
+ int status;
spin_lock_irqsave(&lockres->l_lock, flags);
- if (lksb->status != DLM_NORMAL) {
- mlog(ML_ERROR, "lockres %s: lksb status value of %u!\n",
- lockres->l_name, lksb->status);
+ status = ocfs2_dlm_lock_status(&lockres->l_lksb);
+
+ if (status == -EAGAIN) {
+ lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
+ goto out;
+ }
+
+ if (status) {
+ mlog(ML_ERROR, "lockres %s: lksb status value of %d!\n",
+ lockres->l_name, status);
spin_unlock_irqrestore(&lockres->l_lock, flags);
return;
}
lockres->l_unlock_action);
BUG();
}
-
+out:
/* set it to something invalid so if we get called again we
* can catch it. */
lockres->l_action = OCFS2_AST_INVALID;
+ /* Did we try to cancel this lock? Clear that state */
+ if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT)
+ lockres->l_unlock_action = OCFS2_UNLOCK_INVALID;
+
+ /*
+ * We may have beaten the locking functions here. We certainly
+ * know that dlm_lock() has been called :-)
+ * Because we can't have two lock calls in flight at once, we
+ * can use lockres->l_pending_gen.
+ */
+ __lockres_clear_pending(lockres, lockres->l_pending_gen, osb);
+
wake_up(&lockres->l_event);
spin_unlock_irqrestore(&lockres->l_lock, flags);
}
static int ocfs2_lock_create(struct ocfs2_super *osb,
struct ocfs2_lock_res *lockres,
int level,
- int dlm_flags)
+ u32 dlm_flags)
{
int ret = 0;
- enum dlm_status status;
unsigned long flags;
+ unsigned int gen;
mlog_entry_void();
- mlog(0, "lock %s, level = %d, flags = %d\n", lockres->l_name, level,
+ mlog(0, "lock %s, level = %d, flags = %u\n", lockres->l_name, level,
dlm_flags);
spin_lock_irqsave(&lockres->l_lock, flags);
lockres->l_action = OCFS2_AST_ATTACH;
lockres->l_requested = level;
lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
+ gen = lockres_set_pending(lockres);
spin_unlock_irqrestore(&lockres->l_lock, flags);
- status = dlmlock(osb->dlm,
- level,
- &lockres->l_lksb,
- dlm_flags,
- lockres->l_name,
- OCFS2_LOCK_ID_MAX_LEN - 1,
- ocfs2_locking_ast,
- lockres,
- ocfs2_blocking_ast);
- if (status != DLM_NORMAL) {
- ocfs2_log_dlm_error("dlmlock", status, lockres);
- ret = -EINVAL;
+ ret = ocfs2_dlm_lock(osb->cconn,
+ level,
+ &lockres->l_lksb,
+ dlm_flags,
+ lockres->l_name,
+ OCFS2_LOCK_ID_MAX_LEN - 1,
+ lockres);
+ lockres_clear_pending(lockres, gen, osb);
+ if (ret) {
+ ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres);
ocfs2_recover_from_dlm_error(lockres, 1);
}
- mlog(0, "lock %s, successfull return from dlmlock\n", lockres->l_name);
+ mlog(0, "lock %s, return from ocfs2_dlm_lock\n", lockres->l_name);
bail:
mlog_exit(ret);
{
INIT_LIST_HEAD(&mw->mw_item);
init_completion(&mw->mw_complete);
+ ocfs2_init_start_time(mw);
}
static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw)
}
-static int ocfs2_cluster_lock(struct ocfs2_super *osb,
- struct ocfs2_lock_res *lockres,
- int level,
- int lkm_flags,
- int arg_flags)
+static int ocfs2_wait_for_mask_interruptible(struct ocfs2_mask_waiter *mw,
+ struct ocfs2_lock_res *lockres)
+{
+ int ret;
+
+ ret = wait_for_completion_interruptible(&mw->mw_complete);
+ if (ret)
+ lockres_remove_mask_waiter(lockres, mw);
+ else
+ ret = mw->mw_status;
+ /* Re-arm the completion in case we want to wait on it again */
+ INIT_COMPLETION(mw->mw_complete);
+ return ret;
+}
+
+static int __ocfs2_cluster_lock(struct ocfs2_super *osb,
+ struct ocfs2_lock_res *lockres,
+ int level,
+ u32 lkm_flags,
+ int arg_flags,
+ int l_subclass,
+ unsigned long caller_ip)
{
struct ocfs2_mask_waiter mw;
- enum dlm_status status;
int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR);
int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */
unsigned long flags;
+ unsigned int gen;
+ int noqueue_attempted = 0;
mlog_entry_void();
ocfs2_init_mask_waiter(&mw);
if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB)
- lkm_flags |= LKM_VALBLK;
+ lkm_flags |= DLM_LKF_VALBLK;
again:
wait = 0;
goto unlock;
}
- if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
- /* lock has not been created yet. */
- spin_unlock_irqrestore(&lockres->l_lock, flags);
-
- ret = ocfs2_lock_create(osb, lockres, LKM_NLMODE, 0);
- if (ret < 0) {
- mlog_errno(ret);
- goto out;
- }
- goto again;
- }
-
if (lockres->l_flags & OCFS2_LOCK_BLOCKED &&
!ocfs2_may_continue_on_blocked_lock(lockres, level)) {
/* is the lock is currently blocked on behalf of
}
if (level > lockres->l_level) {
+ if (noqueue_attempted > 0) {
+ ret = -EAGAIN;
+ goto unlock;
+ }
+ if (lkm_flags & DLM_LKF_NOQUEUE)
+ noqueue_attempted = 1;
+
if (lockres->l_action != OCFS2_AST_INVALID)
mlog(ML_ERROR, "lockres %s has action %u pending\n",
lockres->l_name, lockres->l_action);
- lockres->l_action = OCFS2_AST_CONVERT;
+ if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
+ lockres->l_action = OCFS2_AST_ATTACH;
+ lkm_flags &= ~DLM_LKF_CONVERT;
+ } else {
+ lockres->l_action = OCFS2_AST_CONVERT;
+ lkm_flags |= DLM_LKF_CONVERT;
+ }
+
lockres->l_requested = level;
lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
+ gen = lockres_set_pending(lockres);
spin_unlock_irqrestore(&lockres->l_lock, flags);
- BUG_ON(level == LKM_IVMODE);
- BUG_ON(level == LKM_NLMODE);
+ BUG_ON(level == DLM_LOCK_IV);
+ BUG_ON(level == DLM_LOCK_NL);
mlog(0, "lock %s, convert from %d to level = %d\n",
lockres->l_name, lockres->l_level, level);
/* call dlm_lock to upgrade lock now */
- status = dlmlock(osb->dlm,
- level,
- &lockres->l_lksb,
- lkm_flags|LKM_CONVERT,
- lockres->l_name,
- OCFS2_LOCK_ID_MAX_LEN - 1,
- ocfs2_locking_ast,
- lockres,
- ocfs2_blocking_ast);
- if (status != DLM_NORMAL) {
- if ((lkm_flags & LKM_NOQUEUE) &&
- (status == DLM_NOTQUEUED))
- ret = -EAGAIN;
- else {
- ocfs2_log_dlm_error("dlmlock", status,
- lockres);
- ret = -EINVAL;
+ ret = ocfs2_dlm_lock(osb->cconn,
+ level,
+ &lockres->l_lksb,
+ lkm_flags,
+ lockres->l_name,
+ OCFS2_LOCK_ID_MAX_LEN - 1,
+ lockres);
+ lockres_clear_pending(lockres, gen, osb);
+ if (ret) {
+ if (!(lkm_flags & DLM_LKF_NOQUEUE) ||
+ (ret != -EAGAIN)) {
+ ocfs2_log_dlm_error("ocfs2_dlm_lock",
+ ret, lockres);
}
ocfs2_recover_from_dlm_error(lockres, 1);
goto out;
}
- mlog(0, "lock %s, successfull return from dlmlock\n",
+ mlog(0, "lock %s, successful return from ocfs2_dlm_lock\n",
lockres->l_name);
/* At this point we've gone inside the dlm and need to
goto again;
mlog_errno(ret);
}
+ ocfs2_update_lock_stats(lockres, level, &mw, ret);
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ if (!ret && lockres->l_lockdep_map.key != NULL) {
+ if (level == DLM_LOCK_PR)
+ rwsem_acquire_read(&lockres->l_lockdep_map, l_subclass,
+ !!(arg_flags & OCFS2_META_LOCK_NOQUEUE),
+ caller_ip);
+ else
+ rwsem_acquire(&lockres->l_lockdep_map, l_subclass,
+ !!(arg_flags & OCFS2_META_LOCK_NOQUEUE),
+ caller_ip);
+ }
+#endif
mlog_exit(ret);
return ret;
}
-static void ocfs2_cluster_unlock(struct ocfs2_super *osb,
- struct ocfs2_lock_res *lockres,
- int level)
+static inline int ocfs2_cluster_lock(struct ocfs2_super *osb,
+ struct ocfs2_lock_res *lockres,
+ int level,
+ u32 lkm_flags,
+ int arg_flags)
+{
+ return __ocfs2_cluster_lock(osb, lockres, level, lkm_flags, arg_flags,
+ 0, _RET_IP_);
+}
+
+
+static void __ocfs2_cluster_unlock(struct ocfs2_super *osb,
+ struct ocfs2_lock_res *lockres,
+ int level,
+ unsigned long caller_ip)
{
unsigned long flags;
mlog_entry_void();
spin_lock_irqsave(&lockres->l_lock, flags);
ocfs2_dec_holders(lockres, level);
- ocfs2_vote_on_unlock(osb, lockres);
+ ocfs2_downconvert_on_unlock(osb, lockres);
spin_unlock_irqrestore(&lockres->l_lock, flags);
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ if (lockres->l_lockdep_map.key != NULL)
+ rwsem_release(&lockres->l_lockdep_map, 1, caller_ip);
+#endif
mlog_exit_void();
}
-int ocfs2_create_new_lock(struct ocfs2_super *osb,
- struct ocfs2_lock_res *lockres,
- int ex,
- int local)
+static int ocfs2_create_new_lock(struct ocfs2_super *osb,
+ struct ocfs2_lock_res *lockres,
+ int ex,
+ int local)
{
- int level = ex ? LKM_EXMODE : LKM_PRMODE;
+ int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
unsigned long flags;
- int lkm_flags = local ? LKM_LOCAL : 0;
+ u32 lkm_flags = local ? DLM_LKF_LOCAL : 0;
spin_lock_irqsave(&lockres->l_lock, flags);
BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED);
}
/*
- * We don't want to use LKM_LOCAL on a meta data lock as they
+ * We don't want to use DLM_LKF_LOCAL on a meta data lock as they
* don't use a generation in their lock names.
*/
- ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_meta_lockres, 1, 0);
+ ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_inode_lockres, 1, 0);
if (ret) {
mlog_errno(ret);
goto bail;
}
- ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_data_lockres, 1, 1);
+ ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_open_lockres, 0, 0);
if (ret) {
mlog_errno(ret);
goto bail;
{
int status, level;
struct ocfs2_lock_res *lockres;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
BUG_ON(!inode);
(unsigned long long)OCFS2_I(inode)->ip_blkno,
write ? "EXMODE" : "PRMODE");
+ if (ocfs2_mount_local(osb)) {
+ mlog_exit(0);
+ return 0;
+ }
+
lockres = &OCFS2_I(inode)->ip_rw_lockres;
- level = write ? LKM_EXMODE : LKM_PRMODE;
+ level = write ? DLM_LOCK_EX : DLM_LOCK_PR;
status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0,
0);
void ocfs2_rw_unlock(struct inode *inode, int write)
{
- int level = write ? LKM_EXMODE : LKM_PRMODE;
+ int level = write ? DLM_LOCK_EX : DLM_LOCK_PR;
struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
mlog_entry_void();
(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();
}
-int ocfs2_data_lock_full(struct inode *inode,
- int write,
- int arg_flags)
+/*
+ * ocfs2_open_lock always get PR mode lock.
+ */
+int ocfs2_open_lock(struct inode *inode)
{
- int status = 0, level;
+ int status = 0;
struct ocfs2_lock_res *lockres;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
BUG_ON(!inode);
mlog_entry_void();
- mlog(0, "inode %llu take %s DATA lock\n",
- (unsigned long long)OCFS2_I(inode)->ip_blkno,
- write ? "EXMODE" : "PRMODE");
+ mlog(0, "inode %llu take PRMODE open lock\n",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno);
- /* We'll allow faking a readonly data lock for
- * rodevices. */
- if (ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) {
- if (write) {
- status = -EROFS;
- mlog_errno(status);
- }
+ if (ocfs2_mount_local(osb))
goto out;
- }
- lockres = &OCFS2_I(inode)->ip_data_lockres;
+ lockres = &OCFS2_I(inode)->ip_open_lockres;
- level = write ? LKM_EXMODE : LKM_PRMODE;
-
- status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level,
- 0, arg_flags);
- if (status < 0 && status != -EAGAIN)
+ status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres,
+ DLM_LOCK_PR, 0, 0);
+ if (status < 0)
mlog_errno(status);
out:
return status;
}
-/* see ocfs2_meta_lock_with_page() */
-int ocfs2_data_lock_with_page(struct inode *inode,
- int write,
- struct page *page)
+int ocfs2_try_open_lock(struct inode *inode, int write)
+{
+ int status = 0, level;
+ struct ocfs2_lock_res *lockres;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+ BUG_ON(!inode);
+
+ mlog_entry_void();
+
+ mlog(0, "inode %llu try to take %s open lock\n",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno,
+ write ? "EXMODE" : "PRMODE");
+
+ if (ocfs2_mount_local(osb))
+ goto out;
+
+ lockres = &OCFS2_I(inode)->ip_open_lockres;
+
+ level = write ? DLM_LOCK_EX : DLM_LOCK_PR;
+
+ /*
+ * The file system may already holding a PRMODE/EXMODE open lock.
+ * Since we pass DLM_LKF_NOQUEUE, the request won't block waiting on
+ * other nodes and the -EAGAIN will indicate to the caller that
+ * this inode is still in use.
+ */
+ status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres,
+ level, DLM_LKF_NOQUEUE, 0);
+
+out:
+ mlog_exit(status);
+ return status;
+}
+
+/*
+ * ocfs2_open_unlock unlock PR and EX mode open locks.
+ */
+void ocfs2_open_unlock(struct inode *inode)
+{
+ struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_open_lockres;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+
+ mlog_entry_void();
+
+ mlog(0, "inode %llu drop open lock\n",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno);
+
+ if (ocfs2_mount_local(osb))
+ goto out;
+
+ if(lockres->l_ro_holders)
+ ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres,
+ DLM_LOCK_PR);
+ if(lockres->l_ex_holders)
+ ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres,
+ DLM_LOCK_EX);
+
+out:
+ mlog_exit_void();
+}
+
+static int ocfs2_flock_handle_signal(struct ocfs2_lock_res *lockres,
+ int level)
{
int ret;
+ struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres);
+ unsigned long flags;
+ struct ocfs2_mask_waiter mw;
- ret = ocfs2_data_lock_full(inode, write, OCFS2_LOCK_NONBLOCK);
- if (ret == -EAGAIN) {
- unlock_page(page);
- if (ocfs2_data_lock(inode, write) == 0)
- ocfs2_data_unlock(inode, write);
- ret = AOP_TRUNCATED_PAGE;
+ ocfs2_init_mask_waiter(&mw);
+
+retry_cancel:
+ spin_lock_irqsave(&lockres->l_lock, flags);
+ if (lockres->l_flags & OCFS2_LOCK_BUSY) {
+ ret = ocfs2_prepare_cancel_convert(osb, lockres);
+ if (ret) {
+ spin_unlock_irqrestore(&lockres->l_lock, flags);
+ ret = ocfs2_cancel_convert(osb, lockres);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out;
+ }
+ goto retry_cancel;
+ }
+ lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
+ spin_unlock_irqrestore(&lockres->l_lock, flags);
+
+ ocfs2_wait_for_mask(&mw);
+ goto retry_cancel;
+ }
+
+ ret = -ERESTARTSYS;
+ /*
+ * We may still have gotten the lock, in which case there's no
+ * point to restarting the syscall.
+ */
+ if (lockres->l_level == level)
+ ret = 0;
+
+ mlog(0, "Cancel returning %d. flags: 0x%lx, level: %d, act: %d\n", ret,
+ lockres->l_flags, lockres->l_level, lockres->l_action);
+
+ spin_unlock_irqrestore(&lockres->l_lock, flags);
+
+out:
+ return ret;
+}
+
+/*
+ * ocfs2_file_lock() and ocfs2_file_unlock() map to a single pair of
+ * flock() calls. The locking approach this requires is sufficiently
+ * different from all other cluster lock types that we implement a
+ * seperate path to the "low-level" dlm calls. In particular:
+ *
+ * - No optimization of lock levels is done - we take at exactly
+ * what's been requested.
+ *
+ * - No lock caching is employed. We immediately downconvert to
+ * no-lock at unlock time. This also means flock locks never go on
+ * the blocking list).
+ *
+ * - Since userspace can trivially deadlock itself with flock, we make
+ * sure to allow cancellation of a misbehaving applications flock()
+ * request.
+ *
+ * - Access to any flock lockres doesn't require concurrency, so we
+ * can simplify the code by requiring the caller to guarantee
+ * serialization of dlmglue flock calls.
+ */
+int ocfs2_file_lock(struct file *file, int ex, int trylock)
+{
+ int ret, level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
+ unsigned int lkm_flags = trylock ? DLM_LKF_NOQUEUE : 0;
+ unsigned long flags;
+ struct ocfs2_file_private *fp = file->private_data;
+ struct ocfs2_lock_res *lockres = &fp->fp_flock;
+ struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb);
+ struct ocfs2_mask_waiter mw;
+
+ ocfs2_init_mask_waiter(&mw);
+
+ if ((lockres->l_flags & OCFS2_LOCK_BUSY) ||
+ (lockres->l_level > DLM_LOCK_NL)) {
+ mlog(ML_ERROR,
+ "File lock \"%s\" has busy or locked state: flags: 0x%lx, "
+ "level: %u\n", lockres->l_name, lockres->l_flags,
+ lockres->l_level);
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&lockres->l_lock, flags);
+ if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) {
+ lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
+ spin_unlock_irqrestore(&lockres->l_lock, flags);
+
+ /*
+ * Get the lock at NLMODE to start - that way we
+ * can cancel the upconvert request if need be.
+ */
+ ret = ocfs2_lock_create(osb, lockres, DLM_LOCK_NL, 0);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ret = ocfs2_wait_for_mask(&mw);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+ spin_lock_irqsave(&lockres->l_lock, flags);
+ }
+
+ lockres->l_action = OCFS2_AST_CONVERT;
+ lkm_flags |= DLM_LKF_CONVERT;
+ lockres->l_requested = level;
+ lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
+
+ lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
+ spin_unlock_irqrestore(&lockres->l_lock, flags);
+
+ ret = ocfs2_dlm_lock(osb->cconn, level, &lockres->l_lksb, lkm_flags,
+ lockres->l_name, OCFS2_LOCK_ID_MAX_LEN - 1,
+ lockres);
+ if (ret) {
+ if (!trylock || (ret != -EAGAIN)) {
+ ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres);
+ ret = -EINVAL;
+ }
+
+ ocfs2_recover_from_dlm_error(lockres, 1);
+ lockres_remove_mask_waiter(lockres, &mw);
+ goto out;
+ }
+
+ ret = ocfs2_wait_for_mask_interruptible(&mw, lockres);
+ if (ret == -ERESTARTSYS) {
+ /*
+ * Userspace can cause deadlock itself with
+ * flock(). Current behavior locally is to allow the
+ * deadlock, but abort the system call if a signal is
+ * received. We follow this example, otherwise a
+ * poorly written program could sit in kernel until
+ * reboot.
+ *
+ * Handling this is a bit more complicated for Ocfs2
+ * though. We can't exit this function with an
+ * outstanding lock request, so a cancel convert is
+ * required. We intentionally overwrite 'ret' - if the
+ * cancel fails and the lock was granted, it's easier
+ * to just bubble success back up to the user.
+ */
+ ret = ocfs2_flock_handle_signal(lockres, level);
+ } else if (!ret && (level > lockres->l_level)) {
+ /* Trylock failed asynchronously */
+ BUG_ON(!trylock);
+ ret = -EAGAIN;
}
+out:
+
+ mlog(0, "Lock: \"%s\" ex: %d, trylock: %d, returns: %d\n",
+ lockres->l_name, ex, trylock, ret);
return ret;
}
-static void ocfs2_vote_on_unlock(struct ocfs2_super *osb,
- struct ocfs2_lock_res *lockres)
+void ocfs2_file_unlock(struct file *file)
+{
+ int ret;
+ unsigned int gen;
+ unsigned long flags;
+ struct ocfs2_file_private *fp = file->private_data;
+ struct ocfs2_lock_res *lockres = &fp->fp_flock;
+ struct ocfs2_super *osb = OCFS2_SB(file->f_mapping->host->i_sb);
+ struct ocfs2_mask_waiter mw;
+
+ ocfs2_init_mask_waiter(&mw);
+
+ if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED))
+ return;
+
+ if (lockres->l_level == DLM_LOCK_NL)
+ return;
+
+ mlog(0, "Unlock: \"%s\" flags: 0x%lx, level: %d, act: %d\n",
+ lockres->l_name, lockres->l_flags, lockres->l_level,
+ lockres->l_action);
+
+ spin_lock_irqsave(&lockres->l_lock, flags);
+ /*
+ * Fake a blocking ast for the downconvert code.
+ */
+ lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED);
+ lockres->l_blocking = DLM_LOCK_EX;
+
+ gen = ocfs2_prepare_downconvert(lockres, DLM_LOCK_NL);
+ lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0);
+ spin_unlock_irqrestore(&lockres->l_lock, flags);
+
+ ret = ocfs2_downconvert_lock(osb, lockres, DLM_LOCK_NL, 0, gen);
+ if (ret) {
+ mlog_errno(ret);
+ return;
+ }
+
+ ret = ocfs2_wait_for_mask(&mw);
+ if (ret)
+ mlog_errno(ret);
+}
+
+static void ocfs2_downconvert_on_unlock(struct ocfs2_super *osb,
+ struct ocfs2_lock_res *lockres)
{
int kick = 0;
mlog_entry_void();
/* If we know that another node is waiting on our lock, kick
- * the vote thread * pre-emptively when we reach a release
+ * the downconvert thread * pre-emptively when we reach a release
* condition. */
if (lockres->l_flags & OCFS2_LOCK_BLOCKED) {
switch(lockres->l_blocking) {
- case LKM_EXMODE:
+ case DLM_LOCK_EX:
if (!lockres->l_ex_holders && !lockres->l_ro_holders)
kick = 1;
break;
- case LKM_PRMODE:
+ case DLM_LOCK_PR:
if (!lockres->l_ex_holders)
kick = 1;
break;
}
if (kick)
- ocfs2_kick_vote_thread(osb);
-
- mlog_exit_void();
-}
-
-void ocfs2_data_unlock(struct inode *inode,
- int write)
-{
- int level = write ? LKM_EXMODE : LKM_PRMODE;
- struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_data_lockres;
-
- mlog_entry_void();
-
- mlog(0, "inode %llu drop %s DATA lock\n",
- (unsigned long long)OCFS2_I(inode)->ip_blkno,
- write ? "EXMODE" : "PRMODE");
-
- if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)))
- ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level);
+ ocfs2_wake_downconvert_thread(osb);
mlog_exit_void();
}
/* Call this with the lockres locked. I am reasonably sure we don't
* need ip_lock in this function as anyone who would be changing those
- * values is supposed to be blocked in ocfs2_meta_lock right now. */
+ * values is supposed to be blocked in ocfs2_inode_lock right now. */
static void __ocfs2_stuff_meta_lvb(struct inode *inode)
{
struct ocfs2_inode_info *oi = OCFS2_I(inode);
- struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres;
+ struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres;
struct ocfs2_meta_lvb *lvb;
mlog_entry_void();
- lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
+ lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
/*
* Invalidate the LVB of a deleted inode - this way other
lvb->lvb_imtime_packed =
cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime));
lvb->lvb_iattr = cpu_to_be32(oi->ip_attr);
+ lvb->lvb_idynfeatures = cpu_to_be16(oi->ip_dyn_features);
lvb->lvb_igeneration = cpu_to_be32(inode->i_generation);
out:
static void ocfs2_refresh_inode_from_lvb(struct inode *inode)
{
struct ocfs2_inode_info *oi = OCFS2_I(inode);
- struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres;
+ struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres;
struct ocfs2_meta_lvb *lvb;
mlog_entry_void();
mlog_meta_lvb(0, lockres);
- lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
+ lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
/* We're safe here without the lockres lock... */
spin_lock(&oi->ip_lock);
i_size_write(inode, be64_to_cpu(lvb->lvb_isize));
oi->ip_attr = be32_to_cpu(lvb->lvb_iattr);
+ oi->ip_dyn_features = be16_to_cpu(lvb->lvb_idynfeatures);
ocfs2_set_inode_flags(inode);
/* fast-symlinks are a special case */
if (S_ISLNK(inode->i_mode) && !oi->ip_clusters)
inode->i_blocks = 0;
else
- inode->i_blocks =
- ocfs2_align_bytes_to_sectors(i_size_read(inode));
+ inode->i_blocks = ocfs2_inode_sector_count(inode);
inode->i_uid = be32_to_cpu(lvb->lvb_iuid);
inode->i_gid = be32_to_cpu(lvb->lvb_igid);
static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode,
struct ocfs2_lock_res *lockres)
{
- struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
+ struct ocfs2_meta_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
- if (lvb->lvb_version == OCFS2_LVB_VERSION
+ if (ocfs2_dlm_lvb_valid(&lockres->l_lksb)
+ && lvb->lvb_version == OCFS2_LVB_VERSION
&& be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation)
return 1;
return 0;
}
/* may or may not return a bh if it went to disk. */
-static int ocfs2_meta_lock_update(struct inode *inode,
+static int ocfs2_inode_lock_update(struct inode *inode,
struct buffer_head **bh)
{
int status = 0;
struct ocfs2_inode_info *oi = OCFS2_I(inode);
- struct ocfs2_lock_res *lockres;
+ struct ocfs2_lock_res *lockres = &oi->ip_inode_lockres;
struct ocfs2_dinode *fe;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
mlog_entry_void();
+ if (ocfs2_mount_local(osb))
+ goto bail;
+
spin_lock(&oi->ip_lock);
if (oi->ip_flags & OCFS2_INODE_DELETED) {
mlog(0, "Orphaned inode %llu was deleted while we "
}
spin_unlock(&oi->ip_lock);
- lockres = &oi->ip_meta_lockres;
-
if (!ocfs2_should_refresh_lock_res(lockres))
goto bail;
/* This will discard any caching information we might have had
* for the inode metadata. */
- ocfs2_metadata_cache_purge(inode);
+ ocfs2_metadata_cache_purge(INODE_CACHE(inode));
- /* will do nothing for inode types that don't use the extent
- * map (directories, bitmap files, etc) */
ocfs2_extent_map_trunc(inode, 0);
if (ocfs2_meta_lvb_is_trustable(inode, lockres)) {
} else {
/* Boo, we have to go to disk. */
/* read bh, cast, ocfs2_refresh_inode */
- status = ocfs2_read_block(OCFS2_SB(inode->i_sb), oi->ip_blkno,
- bh, OCFS2_BH_CACHED, inode);
+ status = ocfs2_read_inode_block(inode, bh);
if (status < 0) {
mlog_errno(status);
goto bail_refresh;
fe = (struct ocfs2_dinode *) (*bh)->b_data;
/* This is a good chance to make sure we're not
- * locking an invalid object.
+ * locking an invalid object. ocfs2_read_inode_block()
+ * already checked that the inode block is sane.
*
* We bug on a stale inode here because we checked
* above whether it was wiped from disk. The wiping
* node provides a guarantee that we receive that
* message and can mark the inode before dropping any
* locks associated with it. */
- if (!OCFS2_IS_VALID_DINODE(fe)) {
- OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
- status = -EIO;
- goto bail_refresh;
- }
mlog_bug_on_msg(inode->i_generation !=
le32_to_cpu(fe->i_generation),
"Invalid dinode %llu disk generation: %u "
le32_to_cpu(fe->i_flags));
ocfs2_refresh_inode(inode, fe);
+ ocfs2_track_lock_refresh(lockres);
}
status = 0;
return 0;
}
- status = ocfs2_read_block(OCFS2_SB(inode->i_sb),
- OCFS2_I(inode)->ip_blkno,
- ret_bh,
- OCFS2_BH_CACHED,
- inode);
+ status = ocfs2_read_inode_block(inode, ret_bh);
if (status < 0)
mlog_errno(status);
* returns < 0 error if the callback will never be called, otherwise
* the result of the lock will be communicated via the callback.
*/
-int ocfs2_meta_lock_full(struct inode *inode,
- struct ocfs2_journal_handle *handle,
- struct buffer_head **ret_bh,
- int ex,
- int arg_flags)
-{
- int status, level, dlm_flags, acquired;
- struct ocfs2_lock_res *lockres;
+int ocfs2_inode_lock_full_nested(struct inode *inode,
+ struct buffer_head **ret_bh,
+ int ex,
+ int arg_flags,
+ int subclass)
+{
+ int status, level, acquired;
+ u32 dlm_flags;
+ struct ocfs2_lock_res *lockres = NULL;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct buffer_head *local_bh = NULL;
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));
+ ocfs2_wait_for_recovery(osb);
- acquired = 0;
- lockres = &OCFS2_I(inode)->ip_meta_lockres;
- level = ex ? LKM_EXMODE : LKM_PRMODE;
+ lockres = &OCFS2_I(inode)->ip_inode_lockres;
+ level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
dlm_flags = 0;
if (arg_flags & OCFS2_META_LOCK_NOQUEUE)
- dlm_flags |= LKM_NOQUEUE;
+ dlm_flags |= DLM_LKF_NOQUEUE;
- status = ocfs2_cluster_lock(osb, lockres, level, dlm_flags, arg_flags);
+ status = __ocfs2_cluster_lock(osb, lockres, level, dlm_flags,
+ arg_flags, subclass, _RET_IP_);
if (status < 0) {
if (status != -EAGAIN && status != -EIOCBRETRY)
mlog_errno(status);
* committed to owning this lock so we don't allow signals to
* abort the operation. */
if (!(arg_flags & OCFS2_META_LOCK_RECOVERY))
- wait_event(osb->recovery_event,
- ocfs2_node_map_is_empty(osb, &osb->recovery_map));
+ ocfs2_wait_for_recovery(osb);
+local:
/*
* We only see this flag if we're being called from
* ocfs2_read_locked_inode(). It means we're locking an inode
*/
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;
}
/* This is fun. The caller may want a bh back, or it may
- * not. ocfs2_meta_lock_update definitely wants one in, but
+ * not. ocfs2_inode_lock_update definitely wants one in, but
* may or may not read one, depending on what's in the
* LVB. The result of all of this is that we've *only* gone to
* disk if we have to, so the complexity is worthwhile. */
- status = ocfs2_meta_lock_update(inode, &local_bh);
+ status = ocfs2_inode_lock_update(inode, &local_bh);
if (status < 0) {
if (status != -ENOENT)
mlog_errno(status);
}
}
- if (handle) {
- status = ocfs2_handle_add_lock(handle, inode);
- if (status < 0)
- mlog_errno(status);
- }
-
bail:
if (status < 0) {
if (ret_bh && (*ret_bh)) {
*ret_bh = NULL;
}
if (acquired)
- ocfs2_meta_unlock(inode, ex);
+ ocfs2_inode_unlock(inode, ex);
}
if (local_bh)
}
/*
- * This is working around a lock inversion between tasks acquiring DLM locks
- * while holding a page lock and the vote thread which blocks dlm lock acquiry
- * while acquiring page locks.
+ * This is working around a lock inversion between tasks acquiring DLM
+ * locks while holding a page lock and the downconvert thread which
+ * blocks dlm lock acquiry while acquiring page locks.
*
* ** These _with_page variantes are only intended to be called from aop
* methods that hold page locks and return a very specific *positive* error
* code that aop methods pass up to the VFS -- test for errors with != 0. **
*
- * The DLM is called such that it returns -EAGAIN if it would have blocked
- * waiting for the vote thread. In that case we unlock our page so the vote
- * thread can make progress. Once we've done this we have to return
- * AOP_TRUNCATED_PAGE so the aop method that called us can bubble that back up
- * into the VFS who will then immediately retry the aop call.
+ * The DLM is called such that it returns -EAGAIN if it would have
+ * blocked waiting for the downconvert thread. In that case we unlock
+ * our page so the downconvert thread can make progress. Once we've
+ * done this we have to return AOP_TRUNCATED_PAGE so the aop method
+ * that called us can bubble that back up into the VFS who will then
+ * immediately retry the aop call.
*
* We do a blocking lock and immediate unlock before returning, though, so that
* the lock has a great chance of being cached on this node by the time the VFS
* ping locks back and forth, but that's a risk we're willing to take to avoid
* the lock inversion simply.
*/
-int ocfs2_meta_lock_with_page(struct inode *inode,
- struct ocfs2_journal_handle *handle,
+int ocfs2_inode_lock_with_page(struct inode *inode,
struct buffer_head **ret_bh,
int ex,
struct page *page)
{
int ret;
- ret = ocfs2_meta_lock_full(inode, handle, ret_bh, ex,
- OCFS2_LOCK_NONBLOCK);
+ ret = ocfs2_inode_lock_full(inode, ret_bh, ex, OCFS2_LOCK_NONBLOCK);
if (ret == -EAGAIN) {
unlock_page(page);
- if (ocfs2_meta_lock(inode, handle, ret_bh, ex) == 0)
- ocfs2_meta_unlock(inode, ex);
+ if (ocfs2_inode_lock(inode, ret_bh, ex) == 0)
+ ocfs2_inode_unlock(inode, ex);
ret = AOP_TRUNCATED_PAGE;
}
return ret;
}
-void ocfs2_meta_unlock(struct inode *inode,
+int ocfs2_inode_lock_atime(struct inode *inode,
+ struct vfsmount *vfsmnt,
+ int *level)
+{
+ int ret;
+
+ mlog_entry_void();
+ ret = ocfs2_inode_lock(inode, NULL, 0);
+ if (ret < 0) {
+ mlog_errno(ret);
+ return ret;
+ }
+
+ /*
+ * If we should update atime, we will get EX lock,
+ * otherwise we just get PR lock.
+ */
+ if (ocfs2_should_update_atime(inode, vfsmnt)) {
+ struct buffer_head *bh = NULL;
+
+ ocfs2_inode_unlock(inode, 0);
+ ret = ocfs2_inode_lock(inode, &bh, 1);
+ if (ret < 0) {
+ mlog_errno(ret);
+ return ret;
+ }
+ *level = 1;
+ if (ocfs2_should_update_atime(inode, vfsmnt))
+ ocfs2_update_inode_atime(inode, bh);
+ if (bh)
+ brelse(bh);
+ } else
+ *level = 0;
+
+ mlog_exit(ret);
+ return ret;
+}
+
+void ocfs2_inode_unlock(struct inode *inode,
int ex)
{
- int level = ex ? LKM_EXMODE : LKM_PRMODE;
- struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres;
+ int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
+ struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_inode_lockres;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
mlog_entry_void();
(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();
}
+int ocfs2_orphan_scan_lock(struct ocfs2_super *osb, u32 *seqno)
+{
+ struct ocfs2_lock_res *lockres;
+ struct ocfs2_orphan_scan_lvb *lvb;
+ int status = 0;
+
+ if (ocfs2_is_hard_readonly(osb))
+ return -EROFS;
+
+ if (ocfs2_mount_local(osb))
+ return 0;
+
+ lockres = &osb->osb_orphan_scan.os_lockres;
+ status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, 0, 0);
+ if (status < 0)
+ return status;
+
+ lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
+ if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) &&
+ lvb->lvb_version == OCFS2_ORPHAN_LVB_VERSION)
+ *seqno = be32_to_cpu(lvb->lvb_os_seqno);
+ else
+ *seqno = osb->osb_orphan_scan.os_seqno + 1;
+
+ return status;
+}
+
+void ocfs2_orphan_scan_unlock(struct ocfs2_super *osb, u32 seqno)
+{
+ struct ocfs2_lock_res *lockres;
+ struct ocfs2_orphan_scan_lvb *lvb;
+
+ if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb)) {
+ lockres = &osb->osb_orphan_scan.os_lockres;
+ lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
+ lvb->lvb_version = OCFS2_ORPHAN_LVB_VERSION;
+ lvb->lvb_os_seqno = cpu_to_be32(seqno);
+ ocfs2_cluster_unlock(osb, lockres, DLM_LOCK_EX);
+ }
+}
+
int ocfs2_super_lock(struct ocfs2_super *osb,
int ex)
{
- int status;
- int level = ex ? LKM_EXMODE : LKM_PRMODE;
+ int status = 0;
+ int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
struct ocfs2_lock_res *lockres = &osb->osb_super_lockres;
- struct buffer_head *bh;
- struct ocfs2_slot_info *si = osb->slot_info;
mlog_entry_void();
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);
goto bail;
}
if (status) {
- bh = si->si_bh;
- status = ocfs2_read_block(osb, bh->b_blocknr, &bh, 0,
- si->si_inode);
- if (status == 0)
- ocfs2_update_slot_info(si);
+ status = ocfs2_refresh_slot_info(osb);
ocfs2_complete_lock_res_refresh(lockres, status);
if (status < 0)
mlog_errno(status);
+ ocfs2_track_lock_refresh(lockres);
}
bail:
mlog_exit(status);
void ocfs2_super_unlock(struct ocfs2_super *osb,
int ex)
{
- int level = ex ? LKM_EXMODE : LKM_PRMODE;
+ int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
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)
if (ocfs2_is_hard_readonly(osb))
return -EROFS;
- status = ocfs2_cluster_lock(osb, lockres, LKM_EXMODE, 0, 0);
+ if (ocfs2_mount_local(osb))
+ return 0;
+
+ status = ocfs2_cluster_lock(osb, lockres, DLM_LOCK_EX, 0, 0);
if (status < 0)
mlog_errno(status);
{
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, DLM_LOCK_EX);
+}
+
+int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex)
+{
+ int status;
+ struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres;
+
+ if (ocfs2_is_hard_readonly(osb))
+ return -EROFS;
+
+ if (ocfs2_mount_local(osb))
+ return 0;
+
+ status = ocfs2_cluster_lock(osb, lockres, ex ? LKM_EXMODE : LKM_PRMODE,
+ 0, 0);
+ if (status < 0)
+ mlog(ML_ERROR, "lock on nfs sync lock failed %d\n", status);
+
+ return status;
+}
+
+void ocfs2_nfs_sync_unlock(struct ocfs2_super *osb, int ex)
+{
+ struct ocfs2_lock_res *lockres = &osb->osb_nfs_sync_lockres;
+
+ if (!ocfs2_mount_local(osb))
+ ocfs2_cluster_unlock(osb, lockres,
+ ex ? LKM_EXMODE : LKM_PRMODE);
}
int ocfs2_dentry_lock(struct dentry *dentry, int ex)
{
int ret;
- int level = ex ? LKM_EXMODE : LKM_PRMODE;
+ int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
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);
void ocfs2_dentry_unlock(struct dentry *dentry, int ex)
{
- int level = ex ? LKM_EXMODE : LKM_PRMODE;
+ int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
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
}
/* So that debugfs.ocfs2 can determine which format is being used */
-#define OCFS2_DLM_DEBUG_STR_VERSION 1
+#define OCFS2_DLM_DEBUG_STR_VERSION 2
static int ocfs2_dlm_seq_show(struct seq_file *m, void *v)
{
int i;
lockres->l_blocking);
/* Dump the raw LVB */
- lvb = lockres->l_lksb.lvb;
+ lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
for(i = 0; i < DLM_LVB_LEN; i++)
seq_printf(m, "0x%x\t", lvb[i]);
+#ifdef CONFIG_OCFS2_FS_STATS
+# define lock_num_prmode(_l) (_l)->l_lock_num_prmode
+# define lock_num_exmode(_l) (_l)->l_lock_num_exmode
+# define lock_num_prmode_failed(_l) (_l)->l_lock_num_prmode_failed
+# define lock_num_exmode_failed(_l) (_l)->l_lock_num_exmode_failed
+# define lock_total_prmode(_l) (_l)->l_lock_total_prmode
+# define lock_total_exmode(_l) (_l)->l_lock_total_exmode
+# define lock_max_prmode(_l) (_l)->l_lock_max_prmode
+# define lock_max_exmode(_l) (_l)->l_lock_max_exmode
+# define lock_refresh(_l) (_l)->l_lock_refresh
+#else
+# define lock_num_prmode(_l) (0ULL)
+# define lock_num_exmode(_l) (0ULL)
+# define lock_num_prmode_failed(_l) (0)
+# define lock_num_exmode_failed(_l) (0)
+# define lock_total_prmode(_l) (0ULL)
+# define lock_total_exmode(_l) (0ULL)
+# define lock_max_prmode(_l) (0)
+# define lock_max_exmode(_l) (0)
+# define lock_refresh(_l) (0)
+#endif
+ /* The following seq_print was added in version 2 of this output */
+ seq_printf(m, "%llu\t"
+ "%llu\t"
+ "%u\t"
+ "%u\t"
+ "%llu\t"
+ "%llu\t"
+ "%u\t"
+ "%u\t"
+ "%u\t",
+ lock_num_prmode(lockres),
+ lock_num_exmode(lockres),
+ lock_num_prmode_failed(lockres),
+ lock_num_exmode_failed(lockres),
+ lock_total_prmode(lockres),
+ lock_total_exmode(lockres),
+ lock_max_prmode(lockres),
+ lock_max_exmode(lockres),
+ lock_refresh(lockres));
+
/* End the line */
seq_printf(m, "\n");
return 0;
}
-static struct seq_operations ocfs2_dlm_seq_ops = {
+static const struct seq_operations ocfs2_dlm_seq_ops = {
.start = ocfs2_dlm_seq_start,
.stop = ocfs2_dlm_seq_stop,
.next = ocfs2_dlm_seq_next,
mlog_errno(ret);
goto out;
}
- osb = (struct ocfs2_super *) inode->u.generic_ip;
+ osb = inode->i_private;
ocfs2_get_dlm_debug(osb->osb_dlm_debug);
priv->p_dlm_debug = osb->osb_dlm_debug;
INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list);
int ocfs2_dlm_init(struct ocfs2_super *osb)
{
- int status;
- u32 dlm_key;
- struct dlm_ctxt *dlm;
+ int status = 0;
+ struct ocfs2_cluster_connection *conn = NULL;
mlog_entry_void();
+ if (ocfs2_mount_local(osb)) {
+ osb->node_num = 0;
+ goto local;
+ }
+
status = ocfs2_dlm_init_debug(osb);
if (status < 0) {
mlog_errno(status);
goto bail;
}
- /* launch vote thread */
- osb->vote_task = kthread_run(ocfs2_vote_thread, osb, "ocfs2vote");
- if (IS_ERR(osb->vote_task)) {
- status = PTR_ERR(osb->vote_task);
- osb->vote_task = NULL;
+ /* launch downconvert thread */
+ osb->dc_task = kthread_run(ocfs2_downconvert_thread, osb, "ocfs2dc");
+ if (IS_ERR(osb->dc_task)) {
+ status = PTR_ERR(osb->dc_task);
+ osb->dc_task = NULL;
mlog_errno(status);
goto bail;
}
- /* used by the dlm code to make message headers unique, each
- * node in this domain must agree on this. */
- dlm_key = crc32_le(0, osb->uuid_str, strlen(osb->uuid_str));
-
/* for now, uuid == domain */
- dlm = dlm_register_domain(osb->uuid_str, dlm_key);
- if (IS_ERR(dlm)) {
- status = PTR_ERR(dlm);
+ status = ocfs2_cluster_connect(osb->osb_cluster_stack,
+ osb->uuid_str,
+ strlen(osb->uuid_str),
+ ocfs2_do_node_down, osb,
+ &conn);
+ if (status) {
mlog_errno(status);
goto bail;
}
+ status = ocfs2_cluster_this_node(&osb->node_num);
+ if (status < 0) {
+ mlog_errno(status);
+ mlog(ML_ERROR,
+ "could not find this host's node number\n");
+ ocfs2_cluster_disconnect(conn, 0);
+ goto bail;
+ }
+
+local:
ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb);
ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb);
+ ocfs2_nfs_sync_lock_res_init(&osb->osb_nfs_sync_lockres, osb);
+ ocfs2_orphan_scan_lock_res_init(&osb->osb_orphan_scan.os_lockres, osb);
- dlm_register_eviction_cb(dlm, &osb->osb_eviction_cb);
-
- osb->dlm = dlm;
+ osb->cconn = conn;
status = 0;
bail:
if (status < 0) {
ocfs2_dlm_shutdown_debug(osb);
- if (osb->vote_task)
- kthread_stop(osb->vote_task);
+ if (osb->dc_task)
+ kthread_stop(osb->dc_task);
}
mlog_exit(status);
return status;
}
-void ocfs2_dlm_shutdown(struct ocfs2_super *osb)
+void ocfs2_dlm_shutdown(struct ocfs2_super *osb,
+ int hangup_pending)
{
mlog_entry_void();
- dlm_unregister_eviction_cb(&osb->osb_eviction_cb);
-
ocfs2_drop_osb_locks(osb);
- if (osb->vote_task) {
- kthread_stop(osb->vote_task);
- osb->vote_task = NULL;
+ /*
+ * Now that we have dropped all locks and ocfs2_dismount_volume()
+ * has disabled recovery, the DLM won't be talking to us. It's
+ * safe to tear things down before disconnecting the cluster.
+ */
+
+ if (osb->dc_task) {
+ kthread_stop(osb->dc_task);
+ osb->dc_task = NULL;
}
ocfs2_lock_res_free(&osb->osb_super_lockres);
ocfs2_lock_res_free(&osb->osb_rename_lockres);
+ ocfs2_lock_res_free(&osb->osb_nfs_sync_lockres);
+ ocfs2_lock_res_free(&osb->osb_orphan_scan.os_lockres);
- dlm_unregister_domain(osb->dlm);
- osb->dlm = NULL;
+ ocfs2_cluster_disconnect(osb->cconn, hangup_pending);
+ osb->cconn = NULL;
ocfs2_dlm_shutdown_debug(osb);
mlog_exit_void();
}
-static void ocfs2_unlock_ast(void *opaque, enum dlm_status status)
+static void ocfs2_unlock_ast(void *opaque, int error)
{
struct ocfs2_lock_res *lockres = opaque;
unsigned long flags;
lockres->l_unlock_action);
spin_lock_irqsave(&lockres->l_lock, flags);
- /* We tried to cancel a convert request, but it was already
- * granted. All we want to do here is clear our unlock
- * state. The wake_up call done at the bottom is redundant
- * (ocfs2_prepare_cancel_convert doesn't sleep on this) but doesn't
- * hurt anything anyway */
- if (status == DLM_CANCELGRANT &&
- lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) {
- mlog(0, "Got cancelgrant for %s\n", lockres->l_name);
-
- /* We don't clear the busy flag in this case as it
- * should have been cleared by the ast which the dlm
- * has called. */
- goto complete_unlock;
- }
-
- if (status != DLM_NORMAL) {
- mlog(ML_ERROR, "Dlm passes status %d for lock %s, "
- "unlock_action %d\n", status, lockres->l_name,
+ if (error) {
+ mlog(ML_ERROR, "Dlm passes error %d for lock %s, "
+ "unlock_action %d\n", error, lockres->l_name,
lockres->l_unlock_action);
spin_unlock_irqrestore(&lockres->l_lock, flags);
+ mlog_exit_void();
return;
}
case OCFS2_UNLOCK_CANCEL_CONVERT:
mlog(0, "Cancel convert success for %s\n", lockres->l_name);
lockres->l_action = OCFS2_AST_INVALID;
+ /* Downconvert thread may have requeued this lock, we
+ * need to wake it. */
+ if (lockres->l_flags & OCFS2_LOCK_BLOCKED)
+ ocfs2_wake_downconvert_thread(ocfs2_get_lockres_osb(lockres));
break;
case OCFS2_UNLOCK_DROP_LOCK:
- lockres->l_level = LKM_IVMODE;
+ lockres->l_level = DLM_LOCK_IV;
break;
default:
BUG();
}
lockres_clear_flags(lockres, OCFS2_LOCK_BUSY);
-complete_unlock:
lockres->l_unlock_action = OCFS2_UNLOCK_INVALID;
- spin_unlock_irqrestore(&lockres->l_lock, flags);
-
wake_up(&lockres->l_event);
+ spin_unlock_irqrestore(&lockres->l_lock, flags);
mlog_exit_void();
}
-typedef void (ocfs2_pre_drop_cb_t)(struct ocfs2_lock_res *, void *);
-
-struct drop_lock_cb {
- ocfs2_pre_drop_cb_t *drop_func;
- void *drop_data;
-};
-
static int ocfs2_drop_lock(struct ocfs2_super *osb,
- struct ocfs2_lock_res *lockres,
- struct drop_lock_cb *dcb)
+ struct ocfs2_lock_res *lockres)
{
- enum dlm_status status;
+ int ret;
unsigned long flags;
- int lkm_flags = 0;
+ u32 lkm_flags = 0;
/* We didn't get anywhere near actually using this lockres. */
if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED))
goto out;
if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB)
- lkm_flags |= LKM_VALBLK;
+ lkm_flags |= DLM_LKF_VALBLK;
spin_lock_irqsave(&lockres->l_lock, flags);
spin_lock_irqsave(&lockres->l_lock, flags);
}
- if (dcb)
- dcb->drop_func(lockres, dcb->drop_data);
+ if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) {
+ if (lockres->l_flags & OCFS2_LOCK_ATTACHED &&
+ lockres->l_level == DLM_LOCK_EX &&
+ !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH))
+ lockres->l_ops->set_lvb(lockres);
+ }
if (lockres->l_flags & OCFS2_LOCK_BUSY)
mlog(ML_ERROR, "destroying busy lock: \"%s\"\n",
mlog(0, "lock %s\n", lockres->l_name);
- status = dlmunlock(osb->dlm, &lockres->l_lksb, lkm_flags,
- ocfs2_unlock_ast, lockres);
- if (status != DLM_NORMAL) {
- ocfs2_log_dlm_error("dlmunlock", status, lockres);
+ ret = ocfs2_dlm_unlock(osb->cconn, &lockres->l_lksb, lkm_flags,
+ lockres);
+ if (ret) {
+ ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres);
mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags);
- dlm_print_one_lock(lockres->l_lksb.lockid);
+ ocfs2_dlm_dump_lksb(&lockres->l_lksb);
BUG();
}
- mlog(0, "lock %s, successfull return from dlmunlock\n",
+ mlog(0, "lock %s, successful return from ocfs2_dlm_unlock\n",
lockres->l_name);
ocfs2_wait_on_busy_lock(lockres);
/* Mark the lockres as being dropped. It will no longer be
* queued if blocking, but we still may have to wait on it
- * being dequeued from the vote thread before we can consider
+ * being dequeued from the downconvert thread before we can consider
* it safe to drop.
*
* You can *not* attempt to call cluster_lock on this lockres anymore. */
int ret;
ocfs2_mark_lockres_freeing(lockres);
- ret = ocfs2_drop_lock(osb, lockres, NULL);
+ ret = ocfs2_drop_lock(osb, lockres);
if (ret)
mlog_errno(ret);
}
{
ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres);
ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres);
-}
-
-static void ocfs2_meta_pre_drop(struct ocfs2_lock_res *lockres, void *data)
-{
- struct inode *inode = data;
-
- /* the metadata lock requires a bit more work as we have an
- * LVB to worry about. */
- if (lockres->l_flags & OCFS2_LOCK_ATTACHED &&
- lockres->l_level == LKM_EXMODE &&
- !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH))
- __ocfs2_stuff_meta_lvb(inode);
+ ocfs2_simple_drop_lockres(osb, &osb->osb_nfs_sync_lockres);
+ ocfs2_simple_drop_lockres(osb, &osb->osb_orphan_scan.os_lockres);
}
int ocfs2_drop_inode_locks(struct inode *inode)
{
int status, err;
- struct drop_lock_cb meta_dcb = { ocfs2_meta_pre_drop, inode, };
mlog_entry_void();
* ocfs2_clear_inode has done it for us. */
err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
- &OCFS2_I(inode)->ip_data_lockres,
- NULL);
+ &OCFS2_I(inode)->ip_open_lockres);
if (err < 0)
mlog_errno(err);
status = err;
err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
- &OCFS2_I(inode)->ip_meta_lockres,
- &meta_dcb);
+ &OCFS2_I(inode)->ip_inode_lockres);
if (err < 0)
mlog_errno(err);
if (err < 0 && !status)
status = err;
err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb),
- &OCFS2_I(inode)->ip_rw_lockres,
- NULL);
+ &OCFS2_I(inode)->ip_rw_lockres);
if (err < 0)
mlog_errno(err);
if (err < 0 && !status)
return status;
}
-static void ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres,
- int new_level)
+static unsigned int ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres,
+ int new_level)
{
assert_spin_locked(&lockres->l_lock);
- BUG_ON(lockres->l_blocking <= LKM_NLMODE);
+ BUG_ON(lockres->l_blocking <= DLM_LOCK_NL);
if (lockres->l_level <= new_level) {
- mlog(ML_ERROR, "lockres->l_level (%u) <= new_level (%u)\n",
+ mlog(ML_ERROR, "lockres->l_level (%d) <= new_level (%d)\n",
lockres->l_level, new_level);
BUG();
}
lockres->l_action = OCFS2_AST_DOWNCONVERT;
lockres->l_requested = new_level;
lockres_or_flags(lockres, OCFS2_LOCK_BUSY);
+ return lockres_set_pending(lockres);
}
static int ocfs2_downconvert_lock(struct ocfs2_super *osb,
struct ocfs2_lock_res *lockres,
int new_level,
- int lvb)
+ int lvb,
+ unsigned int generation)
{
- int ret, dlm_flags = LKM_CONVERT;
- enum dlm_status status;
+ int ret;
+ u32 dlm_flags = DLM_LKF_CONVERT;
mlog_entry_void();
if (lvb)
- dlm_flags |= LKM_VALBLK;
-
- status = dlmlock(osb->dlm,
- new_level,
- &lockres->l_lksb,
- dlm_flags,
- lockres->l_name,
- OCFS2_LOCK_ID_MAX_LEN - 1,
- ocfs2_locking_ast,
- lockres,
- ocfs2_blocking_ast);
- if (status != DLM_NORMAL) {
- ocfs2_log_dlm_error("dlmlock", status, lockres);
- ret = -EINVAL;
+ dlm_flags |= DLM_LKF_VALBLK;
+
+ ret = ocfs2_dlm_lock(osb->cconn,
+ new_level,
+ &lockres->l_lksb,
+ dlm_flags,
+ lockres->l_name,
+ OCFS2_LOCK_ID_MAX_LEN - 1,
+ lockres);
+ lockres_clear_pending(lockres, generation, osb);
+ if (ret) {
+ ocfs2_log_dlm_error("ocfs2_dlm_lock", ret, lockres);
ocfs2_recover_from_dlm_error(lockres, 1);
goto bail;
}
return ret;
}
-/* returns 1 when the caller should unlock and call dlmunlock */
+/* returns 1 when the caller should unlock and call ocfs2_dlm_unlock */
static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb,
struct ocfs2_lock_res *lockres)
{
struct ocfs2_lock_res *lockres)
{
int ret;
- enum dlm_status status;
mlog_entry_void();
mlog(0, "lock %s\n", lockres->l_name);
- ret = 0;
- status = dlmunlock(osb->dlm,
- &lockres->l_lksb,
- LKM_CANCEL,
- ocfs2_unlock_ast,
- lockres);
- if (status != DLM_NORMAL) {
- ocfs2_log_dlm_error("dlmunlock", status, lockres);
- ret = -EINVAL;
+ ret = ocfs2_dlm_unlock(osb->cconn, &lockres->l_lksb,
+ DLM_LKF_CANCEL, lockres);
+ if (ret) {
+ ocfs2_log_dlm_error("ocfs2_dlm_unlock", ret, lockres);
ocfs2_recover_from_dlm_error(lockres, 0);
}
- mlog(0, "lock %s return from dlmunlock\n", lockres->l_name);
-
- mlog_exit(ret);
- return ret;
-}
-
-static inline int ocfs2_can_downconvert_meta_lock(struct inode *inode,
- struct ocfs2_lock_res *lockres,
- int new_level)
-{
- int ret;
-
- mlog_entry_void();
-
- BUG_ON(new_level != LKM_NLMODE && new_level != LKM_PRMODE);
-
- if (lockres->l_flags & OCFS2_LOCK_REFRESHING) {
- ret = 0;
- mlog(0, "lockres %s currently being refreshed -- backing "
- "off!\n", lockres->l_name);
- } else if (new_level == LKM_PRMODE)
- ret = !lockres->l_ex_holders &&
- ocfs2_inode_fully_checkpointed(inode);
- else /* Must be NLMODE we're converting to. */
- ret = !lockres->l_ro_holders && !lockres->l_ex_holders &&
- ocfs2_inode_fully_checkpointed(inode);
-
- mlog_exit(ret);
- return ret;
-}
-
-static int ocfs2_do_unblock_meta(struct inode *inode,
- int *requeue)
-{
- int new_level;
- int set_lvb = 0;
- int ret = 0;
- struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres;
- unsigned long flags;
-
- struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
-
- mlog_entry_void();
-
- spin_lock_irqsave(&lockres->l_lock, flags);
-
- BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED));
-
- mlog(0, "l_level=%d, l_blocking=%d\n", lockres->l_level,
- lockres->l_blocking);
-
- BUG_ON(lockres->l_level != LKM_EXMODE &&
- lockres->l_level != LKM_PRMODE);
-
- if (lockres->l_flags & OCFS2_LOCK_BUSY) {
- *requeue = 1;
- ret = ocfs2_prepare_cancel_convert(osb, lockres);
- spin_unlock_irqrestore(&lockres->l_lock, flags);
- if (ret) {
- ret = ocfs2_cancel_convert(osb, lockres);
- if (ret < 0)
- mlog_errno(ret);
- }
- goto leave;
- }
-
- new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking);
-
- mlog(0, "l_level=%d, l_blocking=%d, new_level=%d\n",
- lockres->l_level, lockres->l_blocking, new_level);
-
- if (ocfs2_can_downconvert_meta_lock(inode, lockres, new_level)) {
- if (lockres->l_level == LKM_EXMODE)
- set_lvb = 1;
-
- /* If the lock hasn't been refreshed yet (rare), then
- * our memory inode values are old and we skip
- * stuffing the lvb. There's no need to actually clear
- * out the lvb here as it's value is still valid. */
- if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) {
- if (set_lvb)
- __ocfs2_stuff_meta_lvb(inode);
- } else
- mlog(0, "lockres %s: downconverting stale lock!\n",
- lockres->l_name);
-
- mlog(0, "calling ocfs2_downconvert_lock with l_level=%d, "
- "l_blocking=%d, new_level=%d\n",
- lockres->l_level, lockres->l_blocking, new_level);
-
- ocfs2_prepare_downconvert(lockres, new_level);
- spin_unlock_irqrestore(&lockres->l_lock, flags);
- ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb);
- goto leave;
- }
- if (!ocfs2_inode_fully_checkpointed(inode))
- ocfs2_start_checkpoint(osb);
+ mlog(0, "lock %s return from ocfs2_dlm_unlock\n", lockres->l_name);
- *requeue = 1;
- spin_unlock_irqrestore(&lockres->l_lock, flags);
- ret = 0;
-leave:
mlog_exit(ret);
return ret;
}
-static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb,
- struct ocfs2_lock_res *lockres,
- struct ocfs2_unblock_ctl *ctl,
- ocfs2_convert_worker_t *worker)
+static int ocfs2_unblock_lock(struct ocfs2_super *osb,
+ struct ocfs2_lock_res *lockres,
+ struct ocfs2_unblock_ctl *ctl)
{
unsigned long flags;
int blocking;
int new_level;
int ret = 0;
+ int set_lvb = 0;
+ unsigned int gen;
mlog_entry_void();
recheck:
if (lockres->l_flags & OCFS2_LOCK_BUSY) {
+ /* XXX
+ * This is a *big* race. The OCFS2_LOCK_PENDING flag
+ * exists entirely for one reason - another thread has set
+ * OCFS2_LOCK_BUSY, but has *NOT* yet called dlm_lock().
+ *
+ * If we do ocfs2_cancel_convert() before the other thread
+ * calls dlm_lock(), our cancel will do nothing. We will
+ * get no ast, and we will have no way of knowing the
+ * cancel failed. Meanwhile, the other thread will call
+ * into dlm_lock() and wait...forever.
+ *
+ * Why forever? Because another node has asked for the
+ * lock first; that's why we're here in unblock_lock().
+ *
+ * The solution is OCFS2_LOCK_PENDING. When PENDING is
+ * set, we just requeue the unblock. Only when the other
+ * thread has called dlm_lock() and cleared PENDING will
+ * we then cancel their request.
+ *
+ * All callers of dlm_lock() must set OCFS2_DLM_PENDING
+ * at the same time they set OCFS2_DLM_BUSY. They must
+ * clear OCFS2_DLM_PENDING after dlm_lock() returns.
+ */
+ if (lockres->l_flags & OCFS2_LOCK_PENDING)
+ goto leave_requeue;
+
ctl->requeue = 1;
ret = ocfs2_prepare_cancel_convert(osb, lockres);
spin_unlock_irqrestore(&lockres->l_lock, flags);
/* if we're blocking an exclusive and we have *any* holders,
* then requeue. */
- if ((lockres->l_blocking == LKM_EXMODE)
+ if ((lockres->l_blocking == DLM_LOCK_EX)
&& (lockres->l_ex_holders || lockres->l_ro_holders))
goto leave_requeue;
/* If it's a PR we're blocking, then only
* requeue if we've got any EX holders */
- if (lockres->l_blocking == LKM_PRMODE &&
+ if (lockres->l_blocking == DLM_LOCK_PR &&
lockres->l_ex_holders)
goto leave_requeue;
&& (lockres->l_flags & OCFS2_LOCK_REFRESHING))
goto leave_requeue;
+ new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking);
+
+ if (lockres->l_ops->check_downconvert
+ && !lockres->l_ops->check_downconvert(lockres, new_level))
+ goto leave_requeue;
+
/* If we get here, then we know that there are no more
* incompatible holders (and anyone asking for an incompatible
* lock is blocked). We can now downconvert the lock */
- if (!worker)
+ if (!lockres->l_ops->downconvert_worker)
goto downconvert;
/* Some lockres types want to do a bit of work before
blocking = lockres->l_blocking;
spin_unlock_irqrestore(&lockres->l_lock, flags);
- ctl->unblock_action = worker(lockres, blocking);
+ ctl->unblock_action = lockres->l_ops->downconvert_worker(lockres, blocking);
if (ctl->unblock_action == UNBLOCK_STOP_POST)
goto leave;
downconvert:
ctl->requeue = 0;
- new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking);
- ocfs2_prepare_downconvert(lockres, new_level);
+ if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) {
+ if (lockres->l_level == DLM_LOCK_EX)
+ set_lvb = 1;
+
+ /*
+ * We only set the lvb if the lock has been fully
+ * refreshed - otherwise we risk setting stale
+ * data. Otherwise, there's no need to actually clear
+ * out the lvb here as it's value is still valid.
+ */
+ if (set_lvb && !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH))
+ lockres->l_ops->set_lvb(lockres);
+ }
+
+ gen = ocfs2_prepare_downconvert(lockres, new_level);
spin_unlock_irqrestore(&lockres->l_lock, flags);
- ret = ocfs2_downconvert_lock(osb, lockres, new_level, 0);
+ ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb,
+ gen);
+
leave:
mlog_exit(ret);
return ret;
inode = ocfs2_lock_res_inode(lockres);
mapping = inode->i_mapping;
+ if (!S_ISREG(inode->i_mode))
+ goto out;
+
+ /*
+ * We need this before the filemap_fdatawrite() so that it can
+ * transfer the dirty bit from the PTE to the
+ * page. Unfortunately this means that even for EX->PR
+ * downconverts, we'll lose our mappings and have to build
+ * them up again.
+ */
+ unmap_mapping_range(mapping, 0, 0, 0);
+
if (filemap_fdatawrite(mapping)) {
mlog(ML_ERROR, "Could not sync inode %llu for downconvert!",
(unsigned long long)OCFS2_I(inode)->ip_blkno);
}
sync_mapping_buffers(mapping);
- if (blocking == LKM_EXMODE) {
+ if (blocking == DLM_LOCK_EX) {
truncate_inode_pages(mapping, 0);
- unmap_mapping_range(mapping, 0, 0, 0);
} else {
/* We only need to wait on the I/O if we're not also
* truncating pages because truncate_inode_pages waits
filemap_fdatawait(mapping);
}
+out:
return UNBLOCK_CONTINUE;
}
-int ocfs2_unblock_data(struct ocfs2_lock_res *lockres,
- struct ocfs2_unblock_ctl *ctl)
+static int ocfs2_ci_checkpointed(struct ocfs2_caching_info *ci,
+ struct ocfs2_lock_res *lockres,
+ int new_level)
{
- int status;
- struct inode *inode;
- struct ocfs2_super *osb;
+ int checkpointed = ocfs2_ci_fully_checkpointed(ci);
- mlog_entry_void();
-
- inode = ocfs2_lock_res_inode(lockres);
- osb = OCFS2_SB(inode->i_sb);
-
- mlog(0, "unblock inode %llu\n",
- (unsigned long long)OCFS2_I(inode)->ip_blkno);
+ BUG_ON(new_level != DLM_LOCK_NL && new_level != DLM_LOCK_PR);
+ BUG_ON(lockres->l_level != DLM_LOCK_EX && !checkpointed);
- status = ocfs2_generic_unblock_lock(osb, lockres, ctl,
- ocfs2_data_convert_worker);
- if (status < 0)
- mlog_errno(status);
-
- mlog(0, "inode %llu, requeue = %d\n",
- (unsigned long long)OCFS2_I(inode)->ip_blkno, ctl->requeue);
+ if (checkpointed)
+ return 1;
- mlog_exit(status);
- return status;
+ ocfs2_start_checkpoint(OCFS2_SB(ocfs2_metadata_cache_get_super(ci)));
+ return 0;
}
-static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres,
- struct ocfs2_unblock_ctl *ctl)
+static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres,
+ int new_level)
{
- int status;
- struct inode *inode;
-
- mlog_entry_void();
-
- mlog(0, "Unblock lockres %s\n", lockres->l_name);
-
- inode = ocfs2_lock_res_inode(lockres);
-
- status = ocfs2_generic_unblock_lock(OCFS2_SB(inode->i_sb),
- lockres, ctl, NULL);
- if (status < 0)
- mlog_errno(status);
+ struct inode *inode = ocfs2_lock_res_inode(lockres);
- mlog_exit(status);
- return status;
+ return ocfs2_ci_checkpointed(INODE_CACHE(inode), lockres, new_level);
}
-static int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres,
- struct ocfs2_unblock_ctl *ctl)
+static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres)
{
- int status;
- struct inode *inode;
-
- mlog_entry_void();
-
- inode = ocfs2_lock_res_inode(lockres);
-
- mlog(0, "unblock inode %llu\n",
- (unsigned long long)OCFS2_I(inode)->ip_blkno);
-
- status = ocfs2_do_unblock_meta(inode, &ctl->requeue);
- if (status < 0)
- mlog_errno(status);
-
- mlog(0, "inode %llu, requeue = %d\n",
- (unsigned long long)OCFS2_I(inode)->ip_blkno, ctl->requeue);
+ struct inode *inode = ocfs2_lock_res_inode(lockres);
- mlog_exit(status);
- return status;
+ __ocfs2_stuff_meta_lvb(inode);
}
/*
* Does the final reference drop on our dentry lock. Right now this
- * happens in the vote thread, but we could choose to simplify the
+ * happens in the downconvert thread, but we could choose to simplify the
* dlmglue API and push these off to the ocfs2_wq in the future.
*/
static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb,
* valid. The downconvert code will retain a PR for this node,
* so there's no further work to do.
*/
- if (blocking == LKM_PRMODE)
+ if (blocking == DLM_LOCK_PR)
return UNBLOCK_CONTINUE;
/*
return UNBLOCK_CONTINUE_POST;
}
-static int ocfs2_unblock_dentry_lock(struct ocfs2_lock_res *lockres,
- struct ocfs2_unblock_ctl *ctl)
+static int ocfs2_check_refcount_downconvert(struct ocfs2_lock_res *lockres,
+ int new_level)
{
- int ret;
- struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres);
- struct ocfs2_super *osb = OCFS2_SB(dl->dl_inode->i_sb);
+ struct ocfs2_refcount_tree *tree =
+ ocfs2_lock_res_refcount_tree(lockres);
- mlog(0, "unblock dentry lock: %llu\n",
- (unsigned long long)OCFS2_I(dl->dl_inode)->ip_blkno);
+ return ocfs2_ci_checkpointed(&tree->rf_ci, lockres, new_level);
+}
- ret = ocfs2_generic_unblock_lock(osb,
- lockres,
- ctl,
- ocfs2_dentry_convert_worker);
- if (ret < 0)
- mlog_errno(ret);
+static int ocfs2_refcount_convert_worker(struct ocfs2_lock_res *lockres,
+ int blocking)
+{
+ struct ocfs2_refcount_tree *tree =
+ ocfs2_lock_res_refcount_tree(lockres);
- mlog(0, "requeue = %d, post = %d\n", ctl->requeue, ctl->unblock_action);
+ ocfs2_metadata_cache_purge(&tree->rf_ci);
- return ret;
+ return UNBLOCK_CONTINUE;
}
-/* Generic unblock function for any lockres whose private data is an
- * ocfs2_super pointer. */
-static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres,
- struct ocfs2_unblock_ctl *ctl)
+static void ocfs2_set_qinfo_lvb(struct ocfs2_lock_res *lockres)
{
- int status;
- struct ocfs2_super *osb;
+ struct ocfs2_qinfo_lvb *lvb;
+ struct ocfs2_mem_dqinfo *oinfo = ocfs2_lock_res_qinfo(lockres);
+ struct mem_dqinfo *info = sb_dqinfo(oinfo->dqi_gi.dqi_sb,
+ oinfo->dqi_gi.dqi_type);
mlog_entry_void();
- mlog(0, "Unblock lockres %s\n", lockres->l_name);
+ lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
+ lvb->lvb_version = OCFS2_QINFO_LVB_VERSION;
+ lvb->lvb_bgrace = cpu_to_be32(info->dqi_bgrace);
+ lvb->lvb_igrace = cpu_to_be32(info->dqi_igrace);
+ lvb->lvb_syncms = cpu_to_be32(oinfo->dqi_syncms);
+ lvb->lvb_blocks = cpu_to_be32(oinfo->dqi_gi.dqi_blocks);
+ lvb->lvb_free_blk = cpu_to_be32(oinfo->dqi_gi.dqi_free_blk);
+ lvb->lvb_free_entry = cpu_to_be32(oinfo->dqi_gi.dqi_free_entry);
+
+ mlog_exit_void();
+}
+
+void ocfs2_qinfo_unlock(struct ocfs2_mem_dqinfo *oinfo, int ex)
+{
+ struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock;
+ struct ocfs2_super *osb = OCFS2_SB(oinfo->dqi_gi.dqi_sb);
+ int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
+
+ mlog_entry_void();
+ if (!ocfs2_is_hard_readonly(osb) && !ocfs2_mount_local(osb))
+ ocfs2_cluster_unlock(osb, lockres, level);
+ mlog_exit_void();
+}
+
+static int ocfs2_refresh_qinfo(struct ocfs2_mem_dqinfo *oinfo)
+{
+ struct mem_dqinfo *info = sb_dqinfo(oinfo->dqi_gi.dqi_sb,
+ oinfo->dqi_gi.dqi_type);
+ struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock;
+ struct ocfs2_qinfo_lvb *lvb = ocfs2_dlm_lvb(&lockres->l_lksb);
+ struct buffer_head *bh = NULL;
+ struct ocfs2_global_disk_dqinfo *gdinfo;
+ int status = 0;
+
+ if (ocfs2_dlm_lvb_valid(&lockres->l_lksb) &&
+ lvb->lvb_version == OCFS2_QINFO_LVB_VERSION) {
+ info->dqi_bgrace = be32_to_cpu(lvb->lvb_bgrace);
+ info->dqi_igrace = be32_to_cpu(lvb->lvb_igrace);
+ oinfo->dqi_syncms = be32_to_cpu(lvb->lvb_syncms);
+ oinfo->dqi_gi.dqi_blocks = be32_to_cpu(lvb->lvb_blocks);
+ oinfo->dqi_gi.dqi_free_blk = be32_to_cpu(lvb->lvb_free_blk);
+ oinfo->dqi_gi.dqi_free_entry =
+ be32_to_cpu(lvb->lvb_free_entry);
+ } else {
+ status = ocfs2_read_quota_block(oinfo->dqi_gqinode, 0, &bh);
+ if (status) {
+ mlog_errno(status);
+ goto bail;
+ }
+ gdinfo = (struct ocfs2_global_disk_dqinfo *)
+ (bh->b_data + OCFS2_GLOBAL_INFO_OFF);
+ info->dqi_bgrace = le32_to_cpu(gdinfo->dqi_bgrace);
+ info->dqi_igrace = le32_to_cpu(gdinfo->dqi_igrace);
+ oinfo->dqi_syncms = le32_to_cpu(gdinfo->dqi_syncms);
+ oinfo->dqi_gi.dqi_blocks = le32_to_cpu(gdinfo->dqi_blocks);
+ oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(gdinfo->dqi_free_blk);
+ oinfo->dqi_gi.dqi_free_entry =
+ le32_to_cpu(gdinfo->dqi_free_entry);
+ brelse(bh);
+ ocfs2_track_lock_refresh(lockres);
+ }
+
+bail:
+ return status;
+}
+
+/* Lock quota info, this function expects at least shared lock on the quota file
+ * so that we can safely refresh quota info from disk. */
+int ocfs2_qinfo_lock(struct ocfs2_mem_dqinfo *oinfo, int ex)
+{
+ struct ocfs2_lock_res *lockres = &oinfo->dqi_gqlock;
+ struct ocfs2_super *osb = OCFS2_SB(oinfo->dqi_gi.dqi_sb);
+ int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
+ int status = 0;
+
+ mlog_entry_void();
+
+ /* On RO devices, locking really isn't needed... */
+ if (ocfs2_is_hard_readonly(osb)) {
+ if (ex)
+ status = -EROFS;
+ goto bail;
+ }
+ if (ocfs2_mount_local(osb))
+ goto bail;
+
+ status = ocfs2_cluster_lock(osb, lockres, level, 0, 0);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ if (!ocfs2_should_refresh_lock_res(lockres))
+ goto bail;
+ /* OK, we have the lock but we need to refresh the quota info */
+ status = ocfs2_refresh_qinfo(oinfo);
+ if (status)
+ ocfs2_qinfo_unlock(oinfo, ex);
+ ocfs2_complete_lock_res_refresh(lockres, status);
+bail:
+ mlog_exit(status);
+ return status;
+}
+
+int ocfs2_refcount_lock(struct ocfs2_refcount_tree *ref_tree, int ex)
+{
+ int status;
+ int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
+ struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres;
+ struct ocfs2_super *osb = lockres->l_priv;
+
+
+ if (ocfs2_is_hard_readonly(osb))
+ return -EROFS;
- osb = ocfs2_get_lockres_osb(lockres);
+ if (ocfs2_mount_local(osb))
+ return 0;
- status = ocfs2_generic_unblock_lock(osb,
- lockres,
- ctl,
- NULL);
+ status = ocfs2_cluster_lock(osb, lockres, level, 0, 0);
if (status < 0)
mlog_errno(status);
- mlog_exit(status);
return status;
}
-void ocfs2_process_blocked_lock(struct ocfs2_super *osb,
- struct ocfs2_lock_res *lockres)
+void ocfs2_refcount_unlock(struct ocfs2_refcount_tree *ref_tree, int ex)
+{
+ int level = ex ? DLM_LOCK_EX : DLM_LOCK_PR;
+ struct ocfs2_lock_res *lockres = &ref_tree->rf_lockres;
+ struct ocfs2_super *osb = lockres->l_priv;
+
+ if (!ocfs2_mount_local(osb))
+ ocfs2_cluster_unlock(osb, lockres, level);
+}
+
+/*
+ * This is the filesystem locking protocol. It provides the lock handling
+ * hooks for the underlying DLM. It has a maximum version number.
+ * The version number allows interoperability with systems running at
+ * the same major number and an equal or smaller minor number.
+ *
+ * Whenever the filesystem does new things with locks (adds or removes a
+ * lock, orders them differently, does different things underneath a lock),
+ * the version must be changed. The protocol is negotiated when joining
+ * the dlm domain. A node may join the domain if its major version is
+ * identical to all other nodes and its minor version is greater than
+ * or equal to all other nodes. When its minor version is greater than
+ * the other nodes, it will run at the minor version specified by the
+ * other nodes.
+ *
+ * If a locking change is made that will not be compatible with older
+ * versions, the major number must be increased and the minor version set
+ * to zero. If a change merely adds a behavior that can be disabled when
+ * speaking to older versions, the minor version must be increased. If a
+ * change adds a fully backwards compatible change (eg, LVB changes that
+ * are just ignored by older versions), the version does not need to be
+ * updated.
+ */
+static struct ocfs2_locking_protocol lproto = {
+ .lp_max_version = {
+ .pv_major = OCFS2_LOCKING_PROTOCOL_MAJOR,
+ .pv_minor = OCFS2_LOCKING_PROTOCOL_MINOR,
+ },
+ .lp_lock_ast = ocfs2_locking_ast,
+ .lp_blocking_ast = ocfs2_blocking_ast,
+ .lp_unlock_ast = ocfs2_unlock_ast,
+};
+
+void ocfs2_set_locking_protocol(void)
+{
+ ocfs2_stack_glue_set_locking_protocol(&lproto);
+}
+
+
+static void ocfs2_process_blocked_lock(struct ocfs2_super *osb,
+ struct ocfs2_lock_res *lockres)
{
int status;
struct ocfs2_unblock_ctl ctl = {0, 0,};
BUG_ON(!lockres);
BUG_ON(!lockres->l_ops);
- BUG_ON(!lockres->l_ops->unblock);
mlog(0, "lockres %s blocked.\n", lockres->l_name);
/* Detect whether a lock has been marked as going away while
- * the vote thread was processing other things. A lock can
+ * the downconvert thread was processing other things. A lock can
* still be marked with OCFS2_LOCK_FREEING after this check,
* but short circuiting here will still save us some
* performance. */
goto unqueue;
spin_unlock_irqrestore(&lockres->l_lock, flags);
- status = lockres->l_ops->unblock(lockres, &ctl);
+ status = ocfs2_unblock_lock(osb, lockres, &ctl);
if (status < 0)
mlog_errno(status);
lockres_or_flags(lockres, OCFS2_LOCK_QUEUED);
- spin_lock(&osb->vote_task_lock);
+ spin_lock(&osb->dc_task_lock);
if (list_empty(&lockres->l_blocked_list)) {
list_add_tail(&lockres->l_blocked_list,
&osb->blocked_lock_list);
osb->blocked_lock_count++;
}
- spin_unlock(&osb->vote_task_lock);
+ spin_unlock(&osb->dc_task_lock);
mlog_exit_void();
}
-/* This aids in debugging situations where a bad LVB might be involved. */
-void ocfs2_dump_meta_lvb_info(u64 level,
- const char *function,
- unsigned int line,
- struct ocfs2_lock_res *lockres)
+static void ocfs2_downconvert_thread_do_work(struct ocfs2_super *osb)
{
- struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
+ unsigned long processed;
+ struct ocfs2_lock_res *lockres;
- mlog(level, "LVB information for %s (called from %s:%u):\n",
- lockres->l_name, function, line);
- mlog(level, "version: %u, clusters: %u, generation: 0x%x\n",
- lvb->lvb_version, be32_to_cpu(lvb->lvb_iclusters),
- be32_to_cpu(lvb->lvb_igeneration));
- mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n",
- (unsigned long long)be64_to_cpu(lvb->lvb_isize),
- be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid),
- be16_to_cpu(lvb->lvb_imode));
- mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, "
- "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink),
- (long long)be64_to_cpu(lvb->lvb_iatime_packed),
- (long long)be64_to_cpu(lvb->lvb_ictime_packed),
- (long long)be64_to_cpu(lvb->lvb_imtime_packed),
- be32_to_cpu(lvb->lvb_iattr));
+ mlog_entry_void();
+
+ spin_lock(&osb->dc_task_lock);
+ /* grab this early so we know to try again if a state change and
+ * wake happens part-way through our work */
+ osb->dc_work_sequence = osb->dc_wake_sequence;
+
+ processed = osb->blocked_lock_count;
+ while (processed) {
+ BUG_ON(list_empty(&osb->blocked_lock_list));
+
+ lockres = list_entry(osb->blocked_lock_list.next,
+ struct ocfs2_lock_res, l_blocked_list);
+ list_del_init(&lockres->l_blocked_list);
+ osb->blocked_lock_count--;
+ spin_unlock(&osb->dc_task_lock);
+
+ BUG_ON(!processed);
+ processed--;
+
+ ocfs2_process_blocked_lock(osb, lockres);
+
+ spin_lock(&osb->dc_task_lock);
+ }
+ spin_unlock(&osb->dc_task_lock);
+
+ mlog_exit_void();
+}
+
+static int ocfs2_downconvert_thread_lists_empty(struct ocfs2_super *osb)
+{
+ int empty = 0;
+
+ spin_lock(&osb->dc_task_lock);
+ if (list_empty(&osb->blocked_lock_list))
+ empty = 1;
+
+ spin_unlock(&osb->dc_task_lock);
+ return empty;
+}
+
+static int ocfs2_downconvert_thread_should_wake(struct ocfs2_super *osb)
+{
+ int should_wake = 0;
+
+ spin_lock(&osb->dc_task_lock);
+ if (osb->dc_work_sequence != osb->dc_wake_sequence)
+ should_wake = 1;
+ spin_unlock(&osb->dc_task_lock);
+
+ return should_wake;
+}
+
+static int ocfs2_downconvert_thread(void *arg)
+{
+ int status = 0;
+ struct ocfs2_super *osb = arg;
+
+ /* only quit once we've been asked to stop and there is no more
+ * work available */
+ while (!(kthread_should_stop() &&
+ ocfs2_downconvert_thread_lists_empty(osb))) {
+
+ wait_event_interruptible(osb->dc_event,
+ ocfs2_downconvert_thread_should_wake(osb) ||
+ kthread_should_stop());
+
+ mlog(0, "downconvert_thread: awoken\n");
+
+ ocfs2_downconvert_thread_do_work(osb);
+ }
+
+ osb->dc_task = NULL;
+ return status;
+}
+
+void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb)
+{
+ spin_lock(&osb->dc_task_lock);
+ /* make sure the voting thread gets a swipe at whatever changes
+ * the caller may have made to the voting state */
+ osb->dc_wake_sequence++;
+ spin_unlock(&osb->dc_task_lock);
+ wake_up(&osb->dc_event);
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff