Merge branch 'gfs2-iopen' into for-next (300e549b) · Commits · EulixOS / Software / Kernel

fs/gfs2/export.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -134,7 +134,9 @@ static struct dentry gfs2_get_dentry(struct super_block sb,
		struct gfs2_sbd *sdp = sb->s_fs_info;
		struct inode *inode;

		inode = gfs2_lookup_by_inum(sdp, inum->no_addr, &inum->no_formal_ino,
		if (!inum->no_formal_ino)
		return ERR_PTR(-ESTALE);
		inode = gfs2_lookup_by_inum(sdp, inum->no_addr, inum->no_formal_ino,
		GFS2_BLKST_DINODE);
		if (IS_ERR(inode))
		return ERR_CAST(inode);

fs/gfs2/glock.c

+165 −11

Original line number	Diff line number	Diff line
		@@ -125,13 +125,12 @@ static void gfs2_glock_dealloc(struct rcu_head *rcu)
		{
		struct gfs2_glock *gl = container_of(rcu, struct gfs2_glock, gl_rcu);

		if (gl->gl_ops->go_flags & GLOF_ASPACE) {
		kmem_cache_free(gfs2_glock_aspace_cachep, gl);
		} else {
		kfree(gl->gl_lksb.sb_lvbptr);
		if (gl->gl_ops->go_flags & GLOF_ASPACE)
		kmem_cache_free(gfs2_glock_aspace_cachep, gl);
		else
		kmem_cache_free(gfs2_glock_cachep, gl);
		}
		}

		/**
		* glock_blocked_by_withdraw - determine if we can still use a glock
		@@ -465,6 +464,15 @@ static void state_change(struct gfs2_glock *gl, unsigned int new_state)
		gl->gl_tchange = jiffies;
		}

		static void gfs2_set_demote(struct gfs2_glock *gl)
		{
		struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;

		set_bit(GLF_DEMOTE, &gl->gl_flags);
		smp_mb();
		wake_up(&sdp->sd_async_glock_wait);
		}

		static void gfs2_demote_wake(struct gfs2_glock *gl)
		{
		gl->gl_demote_state = LM_ST_EXCLUSIVE;
		@@ -757,20 +765,127 @@ __acquires(&gl->gl_lockref.lock)
		return;
		}

		void gfs2_inode_remember_delete(struct gfs2_glock *gl, u64 generation)
		{
		struct gfs2_inode_lvb ri = (void )gl->gl_lksb.sb_lvbptr;

		if (ri->ri_magic == 0)
		ri->ri_magic = cpu_to_be32(GFS2_MAGIC);
		if (ri->ri_magic == cpu_to_be32(GFS2_MAGIC))
		ri->ri_generation_deleted = cpu_to_be64(generation);
		}

		bool gfs2_inode_already_deleted(struct gfs2_glock *gl, u64 generation)
		{
		struct gfs2_inode_lvb ri = (void )gl->gl_lksb.sb_lvbptr;

		if (ri->ri_magic != cpu_to_be32(GFS2_MAGIC))
		return false;
		return generation <= be64_to_cpu(ri->ri_generation_deleted);
		}

		static void gfs2_glock_poke(struct gfs2_glock *gl)
		{
		int flags = LM_FLAG_TRY_1CB \| LM_FLAG_ANY \| GL_SKIP;
		struct gfs2_holder gh;
		int error;

		error = gfs2_glock_nq_init(gl, LM_ST_SHARED, flags, &gh);
		if (!error)
		gfs2_glock_dq(&gh);
		}

		static bool gfs2_try_evict(struct gfs2_glock *gl)
		{
		struct gfs2_inode *ip;
		bool evicted = false;

		/*
		* If there is contention on the iopen glock and we have an inode, try
		* to grab and release the inode so that it can be evicted. This will
		* allow the remote node to go ahead and delete the inode without us
		* having to do it, which will avoid rgrp glock thrashing.
		*
		* The remote node is likely still holding the corresponding inode
		* glock, so it will run before we get to verify that the delete has
		* happened below.
		*/
		spin_lock(&gl->gl_lockref.lock);
		ip = gl->gl_object;
		if (ip && !igrab(&ip->i_inode))
		ip = NULL;
		spin_unlock(&gl->gl_lockref.lock);
		if (ip) {
		struct gfs2_glock *inode_gl = NULL;

		gl->gl_no_formal_ino = ip->i_no_formal_ino;
		set_bit(GIF_DEFERRED_DELETE, &ip->i_flags);
		d_prune_aliases(&ip->i_inode);
		iput(&ip->i_inode);

		/* If the inode was evicted, gl->gl_object will now be NULL. */
		spin_lock(&gl->gl_lockref.lock);
		ip = gl->gl_object;
		if (ip) {
		inode_gl = ip->i_gl;
		lockref_get(&inode_gl->gl_lockref);
		clear_bit(GIF_DEFERRED_DELETE, &ip->i_flags);
		}
		spin_unlock(&gl->gl_lockref.lock);
		if (inode_gl) {
		gfs2_glock_poke(inode_gl);
		gfs2_glock_put(inode_gl);
		}
		evicted = !ip;
		}
		return evicted;
		}

		static void delete_work_func(struct work_struct *work)
		{
		struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_delete);
		struct delayed_work *dwork = to_delayed_work(work);
		struct gfs2_glock *gl = container_of(dwork, struct gfs2_glock, gl_delete);
		struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
		struct inode *inode;
		u64 no_addr = gl->gl_name.ln_number;

		spin_lock(&gl->gl_lockref.lock);
		clear_bit(GLF_PENDING_DELETE, &gl->gl_flags);
		spin_unlock(&gl->gl_lockref.lock);

		/* If someone's using this glock to create a new dinode, the block must
		have been freed by another node, then re-used, in which case our
		iopen callback is too late after the fact. Ignore it. */
		if (test_bit(GLF_INODE_CREATING, &gl->gl_flags))
		goto out;

		inode = gfs2_lookup_by_inum(sdp, no_addr, NULL, GFS2_BLKST_UNLINKED);
		if (test_bit(GLF_DEMOTE, &gl->gl_flags)) {
		/*
		* If we can evict the inode, give the remote node trying to
		* delete the inode some time before verifying that the delete
		* has happened. Otherwise, if we cause contention on the inode glock
		* immediately, the remote node will think that we still have
		* the inode in use, and so it will give up waiting.
		*
		* If we can't evict the inode, signal to the remote node that
		* the inode is still in use. We'll later try to delete the
		* inode locally in gfs2_evict_inode.
		*
		* FIXME: We only need to verify that the remote node has
		* deleted the inode because nodes before this remote delete
		* rework won't cooperate. At a later time, when we no longer
		* care about compatibility with such nodes, we can skip this
		* step entirely.
		*/
		if (gfs2_try_evict(gl)) {
		if (gfs2_queue_delete_work(gl, 5 * HZ))
		return;
		}
		goto out;
		}

		inode = gfs2_lookup_by_inum(sdp, no_addr, gl->gl_no_formal_ino,
		GFS2_BLKST_UNLINKED);
		if (!IS_ERR_OR_NULL(inode)) {
		d_prune_aliases(inode);
		iput(inode);
		@@ -801,7 +916,7 @@ static void glock_work_func(struct work_struct *work)

		if (!delay) {
		clear_bit(GLF_PENDING_DEMOTE, &gl->gl_flags);
		set_bit(GLF_DEMOTE, &gl->gl_flags);
		gfs2_set_demote(gl);
		}
		}
		run_queue(gl, 0);
		@@ -932,7 +1047,7 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
		gl->gl_object = NULL;
		gl->gl_hold_time = GL_GLOCK_DFT_HOLD;
		INIT_DELAYED_WORK(&gl->gl_work, glock_work_func);
		INIT_WORK(&gl->gl_delete, delete_work_func);
		INIT_DELAYED_WORK(&gl->gl_delete, delete_work_func);

		mapping = gfs2_glock2aspace(gl);
		if (mapping) {
		@@ -1146,9 +1261,10 @@ int gfs2_glock_async_wait(unsigned int num_gh, struct gfs2_holder *ghs)
		static void handle_callback(struct gfs2_glock *gl, unsigned int state,
		unsigned long delay, bool remote)
		{
		int bit = delay ? GLF_PENDING_DEMOTE : GLF_DEMOTE;

		set_bit(bit, &gl->gl_flags);
		if (delay)
		set_bit(GLF_PENDING_DEMOTE, &gl->gl_flags);
		else
		gfs2_set_demote(gl);
		if (gl->gl_demote_state == LM_ST_EXCLUSIVE) {
		gl->gl_demote_state = state;
		gl->gl_demote_time = jiffies;
		@@ -1755,6 +1871,44 @@ static void glock_hash_walk(glock_examiner examiner, const struct gfs2_sbd *sdp)
		rhashtable_walk_exit(&iter);
		}

		bool gfs2_queue_delete_work(struct gfs2_glock *gl, unsigned long delay)
		{
		bool queued;

		spin_lock(&gl->gl_lockref.lock);
		queued = queue_delayed_work(gfs2_delete_workqueue,
		&gl->gl_delete, delay);
		if (queued)
		set_bit(GLF_PENDING_DELETE, &gl->gl_flags);
		spin_unlock(&gl->gl_lockref.lock);
		return queued;
		}

		void gfs2_cancel_delete_work(struct gfs2_glock *gl)
		{
		if (cancel_delayed_work_sync(&gl->gl_delete)) {
		clear_bit(GLF_PENDING_DELETE, &gl->gl_flags);
		gfs2_glock_put(gl);
		}
		}

		bool gfs2_delete_work_queued(const struct gfs2_glock *gl)
		{
		return test_bit(GLF_PENDING_DELETE, &gl->gl_flags);
		}

		static void flush_delete_work(struct gfs2_glock *gl)
		{
		flush_delayed_work(&gl->gl_delete);
		gfs2_glock_queue_work(gl, 0);
		}

		void gfs2_flush_delete_work(struct gfs2_sbd *sdp)
		{
		glock_hash_walk(flush_delete_work, sdp);
		flush_workqueue(gfs2_delete_workqueue);
		}

		/**
		* thaw_glock - thaw out a glock which has an unprocessed reply waiting
		* @gl: The glock to thaw

fs/gfs2/glock.h

+7 −0

Original line number	Diff line number	Diff line
		@@ -244,6 +244,10 @@ static inline int gfs2_glock_nq_init(struct gfs2_glock *gl,

		extern void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state);
		extern void gfs2_glock_complete(struct gfs2_glock *gl, int ret);
		extern bool gfs2_queue_delete_work(struct gfs2_glock *gl, unsigned long delay);
		extern void gfs2_cancel_delete_work(struct gfs2_glock *gl);
		extern bool gfs2_delete_work_queued(const struct gfs2_glock *gl);
		extern void gfs2_flush_delete_work(struct gfs2_sbd *sdp);
		extern void gfs2_gl_hash_clear(struct gfs2_sbd *sdp);
		extern void gfs2_glock_finish_truncate(struct gfs2_inode *ip);
		extern void gfs2_glock_thaw(struct gfs2_sbd *sdp);
		@@ -315,4 +319,7 @@ static inline void glock_clear_object(struct gfs2_glock gl, void object)
		spin_unlock(&gl->gl_lockref.lock);
		}

		extern void gfs2_inode_remember_delete(struct gfs2_glock *gl, u64 generation);
		extern bool gfs2_inode_already_deleted(struct gfs2_glock *gl, u64 generation);

		#endif /* __GLOCK_DOT_H__ */

fs/gfs2/glops.c

+9 −2

Original line number	Diff line number	Diff line
		@@ -612,11 +612,17 @@ static void iopen_go_callback(struct gfs2_glock *gl, bool remote)
		if (gl->gl_demote_state == LM_ST_UNLOCKED &&
		gl->gl_state == LM_ST_SHARED && ip) {
		gl->gl_lockref.count++;
		if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
		if (!queue_delayed_work(gfs2_delete_workqueue,
		&gl->gl_delete, 0))
		gl->gl_lockref.count--;
		}
		}

		static int iopen_go_demote_ok(const struct gfs2_glock *gl)
		{
		return !gfs2_delete_work_queued(gl);
		}

		/**
		* inode_go_free - wake up anyone waiting for dlm's unlock ast to free it
		* @gl: glock being freed
		@@ -696,7 +702,7 @@ const struct gfs2_glock_operations gfs2_inode_glops = {
		.go_lock = inode_go_lock,
		.go_dump = inode_go_dump,
		.go_type = LM_TYPE_INODE,
		.go_flags = GLOF_ASPACE \| GLOF_LRU,
		.go_flags = GLOF_ASPACE \| GLOF_LRU \| GLOF_LVB,
		.go_free = inode_go_free,
		};

		@@ -720,6 +726,7 @@ const struct gfs2_glock_operations gfs2_freeze_glops = {
		const struct gfs2_glock_operations gfs2_iopen_glops = {
		.go_type = LM_TYPE_IOPEN,
		.go_callback = iopen_go_callback,
		.go_demote_ok = iopen_go_demote_ok,
		.go_flags = GLOF_LRU \| GLOF_NONDISK,
		};

fs/gfs2/incore.h

+7 −2

Original line number	Diff line number	Diff line
		@@ -345,6 +345,7 @@ enum {
		GLF_OBJECT = 14, /* Used only for tracing */
		GLF_BLOCKING = 15,
		GLF_INODE_CREATING = 16, /* Inode creation occurring */
		GLF_PENDING_DELETE = 17,
		GLF_FREEING = 18, /* Wait for glock to be freed */
		};

		@@ -378,8 +379,11 @@ struct gfs2_glock {
		atomic_t gl_revokes;
		struct delayed_work gl_work;
		union {
		/* For inode and iopen glocks only */
		struct work_struct gl_delete;
		/* For iopen glocks only */
		struct {
		struct delayed_work gl_delete;
		u64 gl_no_formal_ino;
		};
		/* For rgrp glocks only */
		struct {
		loff_t start;
		@@ -398,6 +402,7 @@ enum {
		GIF_ORDERED = 4,
		GIF_FREE_VFS_INODE = 5,
		GIF_GLOP_PENDING = 6,
		GIF_DEFERRED_DELETE = 7,
		};

		struct gfs2_inode {