#include "ocfs2.h"
#include "alloc.h"
+#include "dcache.h"
#include "dlmglue.h"
#include "extent_map.h"
#include "heartbeat.h"
unsigned long mw_goal;
};
-static void ocfs2_inode_ast_func(void *opaque);
-static void ocfs2_inode_bast_func(void *opaque,
- int level);
-static void ocfs2_super_ast_func(void *opaque);
-static void ocfs2_super_bast_func(void *opaque,
- int level);
-static void ocfs2_rename_ast_func(void *opaque);
-static void ocfs2_rename_bast_func(void *opaque,
- int level);
-
-/* so far, all locks have gotten along with the same unlock ast */
-static void ocfs2_unlock_ast_func(void *opaque,
- enum dlm_status status);
-static int ocfs2_do_unblock_meta(struct inode *inode,
- int *requeue);
-static int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres,
- int *requeue);
-static int ocfs2_unblock_data(struct ocfs2_lock_res *lockres,
- int *requeue);
-static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres,
- int *requeue);
-static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres,
- int *requeue);
-typedef void (ocfs2_convert_worker_t)(struct ocfs2_lock_res *, int);
-static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb,
- struct ocfs2_lock_res *lockres,
- int *requeue,
- ocfs2_convert_worker_t *worker);
+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);
+/*
+ * Return value from ->downconvert_worker functions.
+ *
+ * These control the precise actions of ocfs2_unblock_lock()
+ * and ocfs2_process_blocked_lock()
+ *
+ */
+enum ocfs2_unblock_action {
+ UNBLOCK_CONTINUE = 0, /* Continue downconvert */
+ UNBLOCK_CONTINUE_POST = 1, /* Continue downconvert, fire
+ * ->post_unlock callback */
+ UNBLOCK_STOP_POST = 2, /* Do not downconvert, fire
+ * ->post_unlock() callback. */
+};
+
+struct ocfs2_unblock_ctl {
+ int requeue;
+ enum ocfs2_unblock_action unblock_action;
+};
+
+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);
+
+/*
+ * 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 {
- void (*ast)(void *);
- void (*bast)(void *, int);
- void (*unlock_ast)(void *, enum dlm_status);
- int (*unblock)(struct ocfs2_lock_res *, int *);
+ /*
+ * Translate an ocfs2_lock_res * into an ocfs2_super *. Define
+ * this callback if ->l_priv is not an ocfs2_super pointer
+ */
+ struct ocfs2_super * (*get_osb)(struct ocfs2_lock_res *);
+
+ /*
+ * Optionally called in the downconvert (or "vote") 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.
+ */
+ int flags;
};
+/*
+ * Some locks want to "refresh" potentially stale data when a
+ * meaningful (PRMODE or EXMODE) lock level is first obtained. If this
+ * flag is set, the OCFS2_LOCK_NEEDS_REFRESH flag will be set on the
+ * individual lockres l_flags member from the ast function. It is
+ * expected that the locking wrapper will clear the
+ * OCFS2_LOCK_NEEDS_REFRESH flag when done.
+ */
+#define LOCK_TYPE_REQUIRES_REFRESH 0x1
+
+/*
+ * 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
+
static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = {
- .ast = ocfs2_inode_ast_func,
- .bast = ocfs2_inode_bast_func,
- .unlock_ast = ocfs2_unlock_ast_func,
- .unblock = ocfs2_unblock_inode_lock,
+ .get_osb = ocfs2_get_inode_osb,
+ .flags = 0,
};
static struct ocfs2_lock_res_ops ocfs2_inode_meta_lops = {
- .ast = ocfs2_inode_ast_func,
- .bast = ocfs2_inode_bast_func,
- .unlock_ast = ocfs2_unlock_ast_func,
- .unblock = ocfs2_unblock_meta,
+ .get_osb = ocfs2_get_inode_osb,
+ .check_downconvert = ocfs2_check_meta_downconvert,
+ .set_lvb = ocfs2_set_meta_lvb,
+ .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB,
};
-static void ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
- int blocking);
-
static struct ocfs2_lock_res_ops ocfs2_inode_data_lops = {
- .ast = ocfs2_inode_ast_func,
- .bast = ocfs2_inode_bast_func,
- .unlock_ast = ocfs2_unlock_ast_func,
- .unblock = ocfs2_unblock_data,
+ .get_osb = ocfs2_get_inode_osb,
+ .downconvert_worker = ocfs2_data_convert_worker,
+ .flags = 0,
};
static struct ocfs2_lock_res_ops ocfs2_super_lops = {
- .ast = ocfs2_super_ast_func,
- .bast = ocfs2_super_bast_func,
- .unlock_ast = ocfs2_unlock_ast_func,
- .unblock = ocfs2_unblock_osb_lock,
+ .flags = LOCK_TYPE_REQUIRES_REFRESH,
};
static struct ocfs2_lock_res_ops ocfs2_rename_lops = {
- .ast = ocfs2_rename_ast_func,
- .bast = ocfs2_rename_bast_func,
- .unlock_ast = ocfs2_unlock_ast_func,
- .unblock = ocfs2_unblock_osb_lock,
+ .flags = 0,
+};
+
+static struct ocfs2_lock_res_ops ocfs2_dentry_lops = {
+ .get_osb = ocfs2_get_dentry_osb,
+ .post_unlock = ocfs2_dentry_post_unlock,
+ .downconvert_worker = ocfs2_dentry_convert_worker,
+ .flags = 0,
};
static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres)
lockres->l_type == OCFS2_LOCK_TYPE_RW;
}
-static inline int ocfs2_is_super_lock(struct ocfs2_lock_res *lockres)
+static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres)
{
- return lockres->l_type == OCFS2_LOCK_TYPE_SUPER;
-}
+ BUG_ON(!ocfs2_is_inode_lock(lockres));
-static inline int ocfs2_is_rename_lock(struct ocfs2_lock_res *lockres)
-{
- return lockres->l_type == OCFS2_LOCK_TYPE_RENAME;
+ return (struct inode *) lockres->l_priv;
}
-static inline struct ocfs2_super *ocfs2_lock_res_super(struct ocfs2_lock_res *lockres)
+static inline struct ocfs2_dentry_lock *ocfs2_lock_res_dl(struct ocfs2_lock_res *lockres)
{
- BUG_ON(!ocfs2_is_super_lock(lockres)
- && !ocfs2_is_rename_lock(lockres));
+ BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_DENTRY);
- return (struct ocfs2_super *) lockres->l_priv;
+ return (struct ocfs2_dentry_lock *)lockres->l_priv;
}
-static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres)
+static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres)
{
- BUG_ON(!ocfs2_is_inode_lock(lockres));
+ if (lockres->l_ops->get_osb)
+ return lockres->l_ops->get_osb(lockres);
- return (struct inode *) lockres->l_priv;
+ return (struct ocfs2_super *)lockres->l_priv;
}
static int ocfs2_lock_create(struct ocfs2_super *osb,
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 char *ocfs2_lock_type_strings[] = {
- [OCFS2_LOCK_TYPE_META] = "Meta",
- [OCFS2_LOCK_TYPE_DATA] = "Data",
- [OCFS2_LOCK_TYPE_SUPER] = "Super",
- [OCFS2_LOCK_TYPE_RENAME] = "Rename",
- /* Need to differntiate from [R]ename.. serializing writes is the
- * important job it does, anyway. */
- [OCFS2_LOCK_TYPE_RW] = "Write/Read",
-};
-
-static char *ocfs2_lock_type_string(enum ocfs2_lock_type type)
-{
- mlog_bug_on_msg(type >= OCFS2_NUM_LOCK_TYPES, "%d\n", type);
- return ocfs2_lock_type_strings[type];
-}
static void ocfs2_build_lock_name(enum ocfs2_lock_type type,
u64 blkno,
static void ocfs2_lock_res_init_common(struct ocfs2_super *osb,
struct ocfs2_lock_res *res,
enum ocfs2_lock_type type,
- u64 blkno,
- u32 generation,
struct ocfs2_lock_res_ops *ops,
void *priv)
{
- ocfs2_build_lock_name(type, blkno, generation, res->l_name);
-
res->l_type = type;
res->l_ops = ops;
res->l_priv = priv;
void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
enum ocfs2_lock_type type,
+ unsigned int generation,
struct inode *inode)
{
struct ocfs2_lock_res_ops *ops;
break;
};
- ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type,
- OCFS2_I(inode)->ip_blkno,
- inode->i_generation, ops, inode);
+ ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno,
+ generation, res->l_name);
+ ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode);
+}
+
+static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres)
+{
+ struct inode *inode = ocfs2_lock_res_inode(lockres);
+
+ return OCFS2_SB(inode->i_sb);
+}
+
+static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres)
+{
+ __be64 inode_blkno_be;
+
+ memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START],
+ sizeof(__be64));
+
+ return be64_to_cpu(inode_blkno_be);
+}
+
+static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres)
+{
+ struct ocfs2_dentry_lock *dl = lockres->l_priv;
+
+ return OCFS2_SB(dl->dl_inode->i_sb);
+}
+
+void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl,
+ u64 parent, struct inode *inode)
+{
+ int len;
+ u64 inode_blkno = OCFS2_I(inode)->ip_blkno;
+ __be64 inode_blkno_be = cpu_to_be64(inode_blkno);
+ struct ocfs2_lock_res *lockres = &dl->dl_lockres;
+
+ ocfs2_lock_res_init_once(lockres);
+
+ /*
+ * Unfortunately, the standard lock naming scheme won't work
+ * here because we have two 16 byte values to use. Instead,
+ * we'll stuff the inode number as a binary value. We still
+ * want error prints to show something without garbling the
+ * display, so drop a null byte in there before the inode
+ * number. A future version of OCFS2 will likely use all
+ * binary lock names. The stringified names have been a
+ * tremendous aid in debugging, but now that the debugfs
+ * interface exists, we can mangle things there if need be.
+ *
+ * NOTE: We also drop the standard "pad" value (the total lock
+ * name size stays the same though - the last part is all
+ * zeros due to the memset in ocfs2_lock_res_init_once()
+ */
+ len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START,
+ "%c%016llx",
+ ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY),
+ (long long)parent);
+
+ BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1));
+
+ memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be,
+ sizeof(__be64));
+
+ ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres,
+ OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops,
+ dl);
}
static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res,
/* Superblock 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_SUPER, OCFS2_SUPER_BLOCK_BLKNO,
+ 0, res->l_name);
ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER,
- OCFS2_SUPER_BLOCK_BLKNO, 0,
&ocfs2_super_lops, osb);
}
/* Rename lockres doesn't come from a slab so we call init
* once on it manually. */
ocfs2_lock_res_init_once(res);
- ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME, 0, 0,
+ ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name);
+ ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME,
&ocfs2_rename_lops, osb);
}
* 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 == LKM_NLMODE &&
+ lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
lockres->l_level = lockres->l_requested;
BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED);
if (lockres->l_requested > LKM_NLMODE &&
- !(lockres->l_flags & OCFS2_LOCK_LOCAL))
+ !(lockres->l_flags & OCFS2_LOCK_LOCAL) &&
+ lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
lockres->l_level = lockres->l_requested;
mlog_exit_void();
}
-static void ocfs2_inode_ast_func(void *opaque)
-{
- struct ocfs2_lock_res *lockres = opaque;
- struct inode *inode;
- struct dlm_lockstatus *lksb;
- unsigned long flags;
-
- mlog_entry_void();
-
- inode = ocfs2_lock_res_inode(lockres);
-
- mlog(0, "AST fired for inode %llu, l_action = %u, type = %s\n",
- (unsigned long long)OCFS2_I(inode)->ip_blkno, lockres->l_action,
- ocfs2_lock_type_string(lockres->l_type));
-
- BUG_ON(!ocfs2_is_inode_lock(lockres));
-
- spin_lock_irqsave(&lockres->l_lock, flags);
-
- lksb = &(lockres->l_lksb);
- if (lksb->status != DLM_NORMAL) {
- mlog(ML_ERROR, "ocfs2_inode_ast_func: lksb status value of %u "
- "on inode %llu\n", lksb->status,
- (unsigned long long)OCFS2_I(inode)->ip_blkno);
- spin_unlock_irqrestore(&lockres->l_lock, flags);
- mlog_exit_void();
- return;
- }
-
- switch(lockres->l_action) {
- case OCFS2_AST_ATTACH:
- ocfs2_generic_handle_attach_action(lockres);
- lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL);
- break;
- case OCFS2_AST_CONVERT:
- ocfs2_generic_handle_convert_action(lockres);
- break;
- case OCFS2_AST_DOWNCONVERT:
- ocfs2_generic_handle_downconvert_action(lockres);
- break;
- default:
- mlog(ML_ERROR, "lockres %s: ast fired with invalid action: %u "
- "lockres flags = 0x%lx, unlock action: %u\n",
- lockres->l_name, lockres->l_action, lockres->l_flags,
- lockres->l_unlock_action);
-
- BUG();
- }
-
- /* data and rw locking ignores refresh flag for now. */
- if (lockres->l_type != OCFS2_LOCK_TYPE_META)
- lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
-
- /* set it to something invalid so if we get called again we
- * can catch it. */
- lockres->l_action = OCFS2_AST_INVALID;
- spin_unlock_irqrestore(&lockres->l_lock, flags);
- wake_up(&lockres->l_event);
-
- mlog_exit_void();
-}
-
static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres,
int level)
{
return needs_downconvert;
}
-static void ocfs2_generic_bast_func(struct ocfs2_super *osb,
- struct ocfs2_lock_res *lockres,
- int level)
+static void ocfs2_blocking_ast(void *opaque, int level)
{
+ struct ocfs2_lock_res *lockres = opaque;
+ struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres);
int needs_downconvert;
unsigned long flags;
- mlog_entry_void();
-
BUG_ON(level <= LKM_NLMODE);
+ 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));
+
spin_lock_irqsave(&lockres->l_lock, flags);
needs_downconvert = ocfs2_generic_handle_bast(lockres, level);
if (needs_downconvert)
ocfs2_schedule_blocked_lock(osb, lockres);
spin_unlock_irqrestore(&lockres->l_lock, flags);
- ocfs2_kick_vote_thread(osb);
-
wake_up(&lockres->l_event);
- mlog_exit_void();
-}
-
-static void ocfs2_inode_bast_func(void *opaque, int level)
-{
- struct ocfs2_lock_res *lockres = opaque;
- struct inode *inode;
- struct ocfs2_super *osb;
-
- mlog_entry_void();
-
- BUG_ON(!ocfs2_is_inode_lock(lockres));
- inode = ocfs2_lock_res_inode(lockres);
- osb = OCFS2_SB(inode->i_sb);
-
- mlog(0, "BAST fired for inode %llu, blocking %d, level %d type %s\n",
- (unsigned long long)OCFS2_I(inode)->ip_blkno, level,
- lockres->l_level, ocfs2_lock_type_string(lockres->l_type));
-
- ocfs2_generic_bast_func(osb, lockres, level);
-
- mlog_exit_void();
+ ocfs2_kick_vote_thread(osb);
}
-static void ocfs2_generic_ast_func(struct ocfs2_lock_res *lockres,
- int ignore_refresh)
+static void ocfs2_locking_ast(void *opaque)
{
+ struct ocfs2_lock_res *lockres = opaque;
struct dlm_lockstatus *lksb = &lockres->l_lksb;
unsigned long flags;
switch(lockres->l_action) {
case OCFS2_AST_ATTACH:
ocfs2_generic_handle_attach_action(lockres);
+ lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL);
break;
case OCFS2_AST_CONVERT:
ocfs2_generic_handle_convert_action(lockres);
ocfs2_generic_handle_downconvert_action(lockres);
break;
default:
+ mlog(ML_ERROR, "lockres %s: ast fired with invalid action: %u "
+ "lockres flags = 0x%lx, unlock action: %u\n",
+ lockres->l_name, lockres->l_action, lockres->l_flags,
+ lockres->l_unlock_action);
BUG();
}
- if (ignore_refresh)
- lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH);
-
/* set it to something invalid so if we get called again we
* can catch it. */
lockres->l_action = OCFS2_AST_INVALID;
- spin_unlock_irqrestore(&lockres->l_lock, flags);
wake_up(&lockres->l_event);
-}
-
-static void ocfs2_super_ast_func(void *opaque)
-{
- struct ocfs2_lock_res *lockres = opaque;
-
- mlog_entry_void();
- mlog(0, "Superblock AST fired\n");
-
- BUG_ON(!ocfs2_is_super_lock(lockres));
- ocfs2_generic_ast_func(lockres, 0);
-
- mlog_exit_void();
-}
-
-static void ocfs2_super_bast_func(void *opaque,
- int level)
-{
- struct ocfs2_lock_res *lockres = opaque;
- struct ocfs2_super *osb;
-
- mlog_entry_void();
- mlog(0, "Superblock BAST fired\n");
-
- BUG_ON(!ocfs2_is_super_lock(lockres));
- osb = ocfs2_lock_res_super(lockres);
- ocfs2_generic_bast_func(osb, lockres, level);
-
- mlog_exit_void();
-}
-
-static void ocfs2_rename_ast_func(void *opaque)
-{
- struct ocfs2_lock_res *lockres = opaque;
-
- mlog_entry_void();
-
- mlog(0, "Rename AST fired\n");
-
- BUG_ON(!ocfs2_is_rename_lock(lockres));
-
- ocfs2_generic_ast_func(lockres, 1);
-
- mlog_exit_void();
-}
-
-static void ocfs2_rename_bast_func(void *opaque,
- int level)
-{
- struct ocfs2_lock_res *lockres = opaque;
- struct ocfs2_super *osb;
-
- mlog_entry_void();
-
- mlog(0, "Rename BAST fired\n");
-
- BUG_ON(!ocfs2_is_rename_lock(lockres));
-
- osb = ocfs2_lock_res_super(lockres);
- ocfs2_generic_bast_func(osb, lockres, level);
-
- mlog_exit_void();
+ spin_unlock_irqrestore(&lockres->l_lock, flags);
}
static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres,
&lockres->l_lksb,
dlm_flags,
lockres->l_name,
- lockres->l_ops->ast,
+ OCFS2_LOCK_ID_MAX_LEN - 1,
+ ocfs2_locking_ast,
lockres,
- lockres->l_ops->bast);
+ ocfs2_blocking_ast);
if (status != DLM_NORMAL) {
ocfs2_log_dlm_error("dlmlock", status, lockres);
ret = -EINVAL;
ocfs2_init_mask_waiter(&mw);
+ if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB)
+ lkm_flags |= LKM_VALBLK;
+
again:
wait = 0;
status = dlmlock(osb->dlm,
level,
&lockres->l_lksb,
- lkm_flags|LKM_CONVERT|LKM_VALBLK,
+ lkm_flags|LKM_CONVERT,
lockres->l_name,
- lockres->l_ops->ast,
+ OCFS2_LOCK_ID_MAX_LEN - 1,
+ ocfs2_locking_ast,
lockres,
- lockres->l_ops->bast);
+ ocfs2_blocking_ast);
if (status != DLM_NORMAL) {
if ((lkm_flags & LKM_NOQUEUE) &&
(status == DLM_NOTQUEUED))
mlog_exit_void();
}
-static int ocfs2_create_new_inode_lock(struct inode *inode,
- struct ocfs2_lock_res *lockres)
+int ocfs2_create_new_lock(struct ocfs2_super *osb,
+ struct ocfs2_lock_res *lockres,
+ int ex,
+ int local)
{
- struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ int level = ex ? LKM_EXMODE : LKM_PRMODE;
unsigned long flags;
+ int lkm_flags = local ? LKM_LOCAL : 0;
spin_lock_irqsave(&lockres->l_lock, flags);
BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED);
lockres_or_flags(lockres, OCFS2_LOCK_LOCAL);
spin_unlock_irqrestore(&lockres->l_lock, flags);
- return ocfs2_lock_create(osb, lockres, LKM_EXMODE, LKM_LOCAL);
+ return ocfs2_lock_create(osb, lockres, level, lkm_flags);
}
/* Grants us an EX lock on the data and metadata resources, skipping
int ocfs2_create_new_inode_locks(struct inode *inode)
{
int ret;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
BUG_ON(!inode);
BUG_ON(!ocfs2_inode_is_new(inode));
* on a resource which has an invalid one -- we'll set it
* valid when we release the EX. */
- ret = ocfs2_create_new_inode_lock(inode,
- &OCFS2_I(inode)->ip_rw_lockres);
+ ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1);
if (ret) {
mlog_errno(ret);
goto bail;
}
- ret = ocfs2_create_new_inode_lock(inode,
- &OCFS2_I(inode)->ip_meta_lockres);
+ /*
+ * We don't want to use LKM_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);
if (ret) {
mlog_errno(ret);
goto bail;
}
- ret = ocfs2_create_new_inode_lock(inode,
- &OCFS2_I(inode)->ip_data_lockres);
+ ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_data_lockres, 1, 1);
if (ret) {
mlog_errno(ret);
goto bail;
lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb;
- lvb->lvb_version = cpu_to_be32(OCFS2_LVB_VERSION);
+ /*
+ * Invalidate the LVB of a deleted inode - this way other
+ * nodes are forced to go to disk and discover the new inode
+ * status.
+ */
+ if (oi->ip_flags & OCFS2_INODE_DELETED) {
+ lvb->lvb_version = 0;
+ goto out;
+ }
+
+ lvb->lvb_version = OCFS2_LVB_VERSION;
lvb->lvb_isize = cpu_to_be64(i_size_read(inode));
lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters);
lvb->lvb_iuid = cpu_to_be32(inode->i_uid);
cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime));
lvb->lvb_imtime_packed =
cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime));
+ lvb->lvb_iattr = cpu_to_be32(oi->ip_attr);
+ lvb->lvb_igeneration = cpu_to_be32(inode->i_generation);
+out:
mlog_meta_lvb(0, lockres);
mlog_exit_void();
oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters);
i_size_write(inode, be64_to_cpu(lvb->lvb_isize));
+ oi->ip_attr = be32_to_cpu(lvb->lvb_iattr);
+ ocfs2_set_inode_flags(inode);
+
/* fast-symlinks are a special case */
if (S_ISLNK(inode->i_mode) && !oi->ip_clusters)
inode->i_blocks = 0;
mlog_exit_void();
}
-static inline int ocfs2_meta_lvb_is_trustable(struct ocfs2_lock_res *lockres)
+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;
- if (be32_to_cpu(lvb->lvb_version) == OCFS2_LVB_VERSION)
+ if (lvb->lvb_version == OCFS2_LVB_VERSION
+ && be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation)
return 1;
return 0;
}
* map (directories, bitmap files, etc) */
ocfs2_extent_map_trunc(inode, 0);
- if (ocfs2_meta_lvb_is_trustable(lockres)) {
+ if (ocfs2_meta_lvb_is_trustable(inode, lockres)) {
mlog(0, "Trusting LVB on inode %llu\n",
(unsigned long long)oi->ip_blkno);
ocfs2_refresh_inode_from_lvb(inode);
wait_event(osb->recovery_event,
ocfs2_node_map_is_empty(osb, &osb->recovery_map));
+ /*
+ * We only see this flag if we're being called from
+ * ocfs2_read_locked_inode(). It means we're locking an inode
+ * which hasn't been populated yet, so clear the refresh flag
+ * and let the caller handle it.
+ */
+ if (inode->i_state & I_NEW) {
+ status = 0;
+ 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
* may or may not read one, depending on what's in the
ocfs2_cluster_unlock(osb, lockres, LKM_EXMODE);
}
+int ocfs2_dentry_lock(struct dentry *dentry, int ex)
+{
+ int ret;
+ int level = ex ? LKM_EXMODE : LKM_PRMODE;
+ struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
+ struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
+
+ BUG_ON(!dl);
+
+ if (ocfs2_is_hard_readonly(osb))
+ return -EROFS;
+
+ ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0);
+ if (ret < 0)
+ mlog_errno(ret);
+
+ return ret;
+}
+
+void ocfs2_dentry_unlock(struct dentry *dentry, int ex)
+{
+ int level = ex ? LKM_EXMODE : LKM_PRMODE;
+ 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);
+}
+
/* Reference counting of the dlm debug structure. We want this because
* open references on the debug inodes can live on after a mount, so
* we can't rely on the ocfs2_super to always exist. */
if (!lockres)
return -EINVAL;
- seq_printf(m, "0x%x\t"
- "%.*s\t"
- "%d\t"
+ seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION);
+
+ if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY)
+ seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1,
+ lockres->l_name,
+ (unsigned int)ocfs2_get_dentry_lock_ino(lockres));
+ else
+ seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name);
+
+ seq_printf(m, "%d\t"
"0x%lx\t"
"0x%x\t"
"0x%x\t"
"%u\t"
"%d\t"
"%d\t",
- OCFS2_DLM_DEBUG_STR_VERSION,
- OCFS2_LOCK_ID_MAX_LEN, lockres->l_name,
lockres->l_level,
lockres->l_flags,
lockres->l_action,
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);
}
/* launch vote thread */
- osb->vote_task = kthread_run(ocfs2_vote_thread, osb, "ocfs2vote-%d",
- osb->osb_id);
+ 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;
mlog_exit_void();
}
-static void ocfs2_unlock_ast_func(void *opaque, enum dlm_status status)
+static void ocfs2_unlock_ast(void *opaque, enum dlm_status status)
{
struct ocfs2_lock_res *lockres = opaque;
unsigned long 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;
unsigned long flags;
+ int 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;
+
spin_lock_irqsave(&lockres->l_lock, flags);
mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING),
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 == LKM_EXMODE &&
+ !(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_VALBLK,
- lockres->l_ops->unlock_ast, lockres);
+ status = dlmunlock(osb->dlm, &lockres->l_lksb, lkm_flags,
+ ocfs2_unlock_ast, lockres);
if (status != DLM_NORMAL) {
ocfs2_log_dlm_error("dlmunlock", status, lockres);
mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags);
spin_unlock_irqrestore(&lockres->l_lock, flags);
}
-static void ocfs2_drop_osb_locks(struct ocfs2_super *osb)
+void ocfs2_simple_drop_lockres(struct ocfs2_super *osb,
+ struct ocfs2_lock_res *lockres)
{
- int status;
-
- mlog_entry_void();
-
- ocfs2_mark_lockres_freeing(&osb->osb_super_lockres);
-
- status = ocfs2_drop_lock(osb, &osb->osb_super_lockres, NULL);
- if (status < 0)
- mlog_errno(status);
-
- ocfs2_mark_lockres_freeing(&osb->osb_rename_lockres);
-
- status = ocfs2_drop_lock(osb, &osb->osb_rename_lockres, NULL);
- if (status < 0)
- mlog_errno(status);
+ int ret;
- mlog_exit(status);
+ ocfs2_mark_lockres_freeing(lockres);
+ ret = ocfs2_drop_lock(osb, lockres);
+ if (ret)
+ mlog_errno(ret);
}
-static void ocfs2_meta_pre_drop(struct ocfs2_lock_res *lockres, void *data)
+static void ocfs2_drop_osb_locks(struct ocfs2_super *osb)
{
- 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_super_lockres);
+ ocfs2_simple_drop_lockres(osb, &osb->osb_rename_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_data_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_meta_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)
&lockres->l_lksb,
dlm_flags,
lockres->l_name,
- lockres->l_ops->ast,
+ OCFS2_LOCK_ID_MAX_LEN - 1,
+ ocfs2_locking_ast,
lockres,
- lockres->l_ops->bast);
+ ocfs2_blocking_ast);
if (status != DLM_NORMAL) {
ocfs2_log_dlm_error("dlmlock", status, lockres);
ret = -EINVAL;
status = dlmunlock(osb->dlm,
&lockres->l_lksb,
LKM_CANCEL,
- lockres->l_ops->unlock_ast,
+ ocfs2_unlock_ast,
lockres);
if (status != DLM_NORMAL) {
ocfs2_log_dlm_error("dlmunlock", status, lockres);
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);
-
- *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,
- int *requeue,
- 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;
mlog_entry_void();
recheck:
if (lockres->l_flags & OCFS2_LOCK_BUSY) {
- *requeue = 1;
+ ctl->requeue = 1;
ret = ocfs2_prepare_cancel_convert(osb, lockres);
spin_unlock_irqrestore(&lockres->l_lock, flags);
if (ret) {
/* if we're blocking an exclusive and we have *any* holders,
* then requeue. */
if ((lockres->l_blocking == LKM_EXMODE)
- && (lockres->l_ex_holders || lockres->l_ro_holders)) {
- spin_unlock_irqrestore(&lockres->l_lock, flags);
- *requeue = 1;
- ret = 0;
- goto leave;
- }
+ && (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 &&
- lockres->l_ex_holders) {
- spin_unlock_irqrestore(&lockres->l_lock, flags);
- *requeue = 1;
- ret = 0;
- goto leave;
- }
+ lockres->l_ex_holders)
+ goto leave_requeue;
+
+ /*
+ * Can we get a lock in this state if the holder counts are
+ * zero? The meta data unblock code used to check this.
+ */
+ if ((lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH)
+ && (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);
- worker(lockres, blocking);
+ ctl->unblock_action = lockres->l_ops->downconvert_worker(lockres, blocking);
+
+ if (ctl->unblock_action == UNBLOCK_STOP_POST)
+ goto leave;
spin_lock_irqsave(&lockres->l_lock, flags);
if (blocking != lockres->l_blocking) {
}
downconvert:
- *requeue = 0;
- new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking);
+ ctl->requeue = 0;
+
+ if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) {
+ if (lockres->l_level == LKM_EXMODE)
+ 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);
+ }
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);
leave:
mlog_exit(ret);
return ret;
+
+leave_requeue:
+ spin_unlock_irqrestore(&lockres->l_lock, flags);
+ ctl->requeue = 1;
+
+ mlog_exit(0);
+ return 0;
}
-static void ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
- int blocking)
+static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres,
+ int blocking)
{
struct inode *inode;
struct address_space *mapping;
- mlog_entry_void();
-
inode = ocfs2_lock_res_inode(lockres);
mapping = inode->i_mapping;
filemap_fdatawait(mapping);
}
- mlog_exit_void();
+ return UNBLOCK_CONTINUE;
}
-int ocfs2_unblock_data(struct ocfs2_lock_res *lockres,
- int *requeue)
+static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres,
+ int new_level)
{
- int status;
- struct inode *inode;
- struct ocfs2_super *osb;
-
- 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);
+ struct inode *inode = ocfs2_lock_res_inode(lockres);
+ int checkpointed = ocfs2_inode_fully_checkpointed(inode);
- status = ocfs2_generic_unblock_lock(osb,
- lockres,
- requeue,
- ocfs2_data_convert_worker);
- if (status < 0)
- mlog_errno(status);
+ BUG_ON(new_level != LKM_NLMODE && new_level != LKM_PRMODE);
+ BUG_ON(lockres->l_level != LKM_EXMODE && !checkpointed);
- mlog(0, "inode %llu, requeue = %d\n",
- (unsigned long long)OCFS2_I(inode)->ip_blkno, *requeue);
+ if (checkpointed)
+ return 1;
- mlog_exit(status);
- return status;
+ ocfs2_start_checkpoint(OCFS2_SB(inode->i_sb));
+ return 0;
}
-static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres,
- int *requeue)
+static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres)
{
- int status;
- struct inode *inode;
-
- mlog_entry_void();
-
- mlog(0, "Unblock lockres %s\n", lockres->l_name);
-
- inode = ocfs2_lock_res_inode(lockres);
+ struct inode *inode = ocfs2_lock_res_inode(lockres);
- status = ocfs2_generic_unblock_lock(OCFS2_SB(inode->i_sb),
- lockres,
- requeue,
- NULL);
- if (status < 0)
- mlog_errno(status);
-
- mlog_exit(status);
- return status;
+ __ocfs2_stuff_meta_lvb(inode);
}
-
-int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres,
- int *requeue)
+/*
+ * Does the final reference drop on our dentry lock. Right now this
+ * happens in the vote 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,
+ struct ocfs2_lock_res *lockres)
{
- int status;
- struct inode *inode;
-
- mlog_entry_void();
+ struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres);
+ ocfs2_dentry_lock_put(osb, dl);
+}
- inode = ocfs2_lock_res_inode(lockres);
+/*
+ * d_delete() matching dentries before the lock downconvert.
+ *
+ * At this point, any process waiting to destroy the
+ * dentry_lock due to last ref count is stopped by the
+ * OCFS2_LOCK_QUEUED flag.
+ *
+ * We have two potential problems
+ *
+ * 1) If we do the last reference drop on our dentry_lock (via dput)
+ * we'll wind up in ocfs2_release_dentry_lock(), waiting on
+ * the downconvert to finish. Instead we take an elevated
+ * reference and push the drop until after we've completed our
+ * unblock processing.
+ *
+ * 2) There might be another process with a final reference,
+ * waiting on us to finish processing. If this is the case, we
+ * detect it and exit out - there's no more dentries anyway.
+ */
+static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres,
+ int blocking)
+{
+ struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres);
+ struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode);
+ struct dentry *dentry;
+ unsigned long flags;
+ int extra_ref = 0;
- mlog(0, "unblock inode %llu\n",
- (unsigned long long)OCFS2_I(inode)->ip_blkno);
+ /*
+ * This node is blocking another node from getting a read
+ * lock. This happens when we've renamed within a
+ * directory. We've forced the other nodes to d_delete(), but
+ * we never actually dropped our lock because it's still
+ * valid. The downconvert code will retain a PR for this node,
+ * so there's no further work to do.
+ */
+ if (blocking == LKM_PRMODE)
+ return UNBLOCK_CONTINUE;
- status = ocfs2_do_unblock_meta(inode, requeue);
- if (status < 0)
- mlog_errno(status);
+ /*
+ * Mark this inode as potentially orphaned. The code in
+ * ocfs2_delete_inode() will figure out whether it actually
+ * needs to be freed or not.
+ */
+ spin_lock(&oi->ip_lock);
+ oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED;
+ spin_unlock(&oi->ip_lock);
- mlog(0, "inode %llu, requeue = %d\n",
- (unsigned long long)OCFS2_I(inode)->ip_blkno, *requeue);
+ /*
+ * Yuck. We need to make sure however that the check of
+ * OCFS2_LOCK_FREEING and the extra reference are atomic with
+ * respect to a reference decrement or the setting of that
+ * flag.
+ */
+ spin_lock_irqsave(&lockres->l_lock, flags);
+ spin_lock(&dentry_attach_lock);
+ if (!(lockres->l_flags & OCFS2_LOCK_FREEING)
+ && dl->dl_count) {
+ dl->dl_count++;
+ extra_ref = 1;
+ }
+ spin_unlock(&dentry_attach_lock);
+ spin_unlock_irqrestore(&lockres->l_lock, flags);
- mlog_exit(status);
- return status;
-}
+ mlog(0, "extra_ref = %d\n", extra_ref);
-/* 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,
- int *requeue)
-{
- int status;
- struct ocfs2_super *osb;
+ /*
+ * We have a process waiting on us in ocfs2_dentry_iput(),
+ * which means we can't have any more outstanding
+ * aliases. There's no need to do any more work.
+ */
+ if (!extra_ref)
+ return UNBLOCK_CONTINUE;
+
+ spin_lock(&dentry_attach_lock);
+ while (1) {
+ dentry = ocfs2_find_local_alias(dl->dl_inode,
+ dl->dl_parent_blkno, 1);
+ if (!dentry)
+ break;
+ spin_unlock(&dentry_attach_lock);
- mlog_entry_void();
+ mlog(0, "d_delete(%.*s);\n", dentry->d_name.len,
+ dentry->d_name.name);
- mlog(0, "Unblock lockres %s\n", lockres->l_name);
+ /*
+ * The following dcache calls may do an
+ * iput(). Normally we don't want that from the
+ * downconverting thread, but in this case it's ok
+ * because the requesting node already has an
+ * exclusive lock on the inode, so it can't be queued
+ * for a downconvert.
+ */
+ d_delete(dentry);
+ dput(dentry);
- osb = ocfs2_lock_res_super(lockres);
+ spin_lock(&dentry_attach_lock);
+ }
+ spin_unlock(&dentry_attach_lock);
- status = ocfs2_generic_unblock_lock(osb,
- lockres,
- requeue,
- NULL);
- if (status < 0)
- mlog_errno(status);
+ /*
+ * If we are the last holder of this dentry lock, there is no
+ * reason to downconvert so skip straight to the unlock.
+ */
+ if (dl->dl_count == 1)
+ return UNBLOCK_STOP_POST;
- mlog_exit(status);
- return status;
+ return UNBLOCK_CONTINUE_POST;
}
void ocfs2_process_blocked_lock(struct ocfs2_super *osb,
struct ocfs2_lock_res *lockres)
{
int status;
- int requeue = 0;
+ struct ocfs2_unblock_ctl ctl = {0, 0,};
unsigned long flags;
/* Our reference to the lockres in this function can be
BUG_ON(!lockres);
BUG_ON(!lockres->l_ops);
- BUG_ON(!lockres->l_ops->unblock);
mlog(0, "lockres %s blocked.\n", lockres->l_name);
goto unqueue;
spin_unlock_irqrestore(&lockres->l_lock, flags);
- status = lockres->l_ops->unblock(lockres, &requeue);
+ status = ocfs2_unblock_lock(osb, lockres, &ctl);
if (status < 0)
mlog_errno(status);
spin_lock_irqsave(&lockres->l_lock, flags);
unqueue:
- if (lockres->l_flags & OCFS2_LOCK_FREEING || !requeue) {
+ if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) {
lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED);
} else
ocfs2_schedule_blocked_lock(osb, lockres);
mlog(0, "lockres %s, requeue = %s.\n", lockres->l_name,
- requeue ? "yes" : "no");
+ ctl.requeue ? "yes" : "no");
spin_unlock_irqrestore(&lockres->l_lock, flags);
+ if (ctl.unblock_action != UNBLOCK_CONTINUE
+ && lockres->l_ops->post_unlock)
+ lockres->l_ops->post_unlock(osb, lockres);
+
mlog_exit_void();
}
mlog(level, "LVB information for %s (called from %s:%u):\n",
lockres->l_name, function, line);
- mlog(level, "version: %u, clusters: %u\n",
- be32_to_cpu(lvb->lvb_version), be32_to_cpu(lvb->lvb_iclusters));
+ 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\n", be16_to_cpu(lvb->lvb_inlink),
+ "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));
+ (long long)be64_to_cpu(lvb->lvb_imtime_packed),
+ be32_to_cpu(lvb->lvb_iattr));
}
git.openpandora.org / pandora-kernel.git / blobdiff