Commit 4510d86f authored by Kirill Tkhai's avatar Kirill Tkhai Committed by Miklos Szeredi
Browse files

fuse: Convert fc->attr_version into atomic64_t 



This patch makes fc->attr_version of atomic64_t type, so fc->lock won't be
needed to read or modify it anymore.

Signed-off-by: default avatarKirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent ebf84d0c

fs/fuse/dir.c

+2 −17
Original line number Diff line number Diff line
@@ -149,21 +149,6 @@ static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_args *args, 
	args->out.args[0].value = outarg;

}



u64 fuse_get_attr_version(struct fuse_conn *fc)

{

	u64 curr_version;



	/*

	 * The spin lock isn't actually needed on 64bit archs, but we

	 * don't yet care too much about such optimizations.

	 */

	spin_lock(&fc->lock);

	curr_version = fc->attr_version;

	spin_unlock(&fc->lock);



	return curr_version;

}



/*

 * Check whether the dentry is still valid

 *
@@ -674,7 +659,7 @@ static int fuse_unlink(struct inode *dir, struct dentry *entry) 
		struct fuse_inode *fi = get_fuse_inode(inode);



		spin_lock(&fc->lock);

		fi->attr_version = ++fc->attr_version;

		fi->attr_version = atomic64_inc_return(&fc->attr_version);

		/*

		 * If i_nlink == 0 then unlink doesn't make sense, yet this can

		 * happen if userspace filesystem is careless.  It would be
@@ -828,7 +813,7 @@ static int fuse_link(struct dentry *entry, struct inode *newdir, 
		struct fuse_inode *fi = get_fuse_inode(inode);



		spin_lock(&fc->lock);

		fi->attr_version = ++fc->attr_version;

		fi->attr_version = atomic64_inc_return(&fc->attr_version);

		inc_nlink(inode);

		spin_unlock(&fc->lock);

		fuse_invalidate_attr(inode);

fs/fuse/file.c

+4 −4
Original line number Diff line number Diff line
@@ -187,7 +187,7 @@ void fuse_finish_open(struct inode *inode, struct file *file) 
		struct fuse_inode *fi = get_fuse_inode(inode);



		spin_lock(&fc->lock);

		fi->attr_version = ++fc->attr_version;

		fi->attr_version = atomic64_inc_return(&fc->attr_version);

		i_size_write(inode, 0);

		spin_unlock(&fc->lock);

		fuse_invalidate_attr(inode);
@@ -608,7 +608,7 @@ static void fuse_aio_complete(struct fuse_io_priv *io, int err, ssize_t pos) 
			struct fuse_inode *fi = get_fuse_inode(inode);



			spin_lock(&fc->lock);

			fi->attr_version = ++fc->attr_version;

			fi->attr_version = atomic64_inc_return(&fc->attr_version);

			spin_unlock(&fc->lock);

		}
@@ -687,7 +687,7 @@ static void fuse_read_update_size(struct inode *inode, loff_t size, 
	spin_lock(&fc->lock);

	if (attr_ver == fi->attr_version && size < inode->i_size &&

	    !test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) {

		fi->attr_version = ++fc->attr_version;

		fi->attr_version = atomic64_inc_return(&fc->attr_version);

		i_size_write(inode, size);

	}

	spin_unlock(&fc->lock);
@@ -1006,7 +1006,7 @@ bool fuse_write_update_size(struct inode *inode, loff_t pos) 
	bool ret = false;



	spin_lock(&fc->lock);

	fi->attr_version = ++fc->attr_version;

	fi->attr_version = atomic64_inc_return(&fc->attr_version);

	if (pos > inode->i_size) {

		i_size_write(inode, pos);

		ret = true;

fs/fuse/fuse_i.h

+6 −3
Original line number Diff line number Diff line
@@ -730,7 +730,7 @@ struct fuse_conn { 
	struct fuse_req *destroy_req;



	/** Version counter for attribute changes */

	u64 attr_version;

	atomic64_t attr_version;



	/** Called on final put */

	void (*release)(struct fuse_conn *);
@@ -770,6 +770,11 @@ static inline int invalid_nodeid(u64 nodeid) 
	return !nodeid || nodeid == FUSE_ROOT_ID;

}



static inline u64 fuse_get_attr_version(struct fuse_conn *fc)

{

	return atomic64_read(&fc->attr_version);

}



/** Device operations */

extern const struct file_operations fuse_dev_operations;
@@ -1000,8 +1005,6 @@ void fuse_flush_writepages(struct inode *inode); 
void fuse_set_nowrite(struct inode *inode);

void fuse_release_nowrite(struct inode *inode);



u64 fuse_get_attr_version(struct fuse_conn *fc);



/**

 * File-system tells the kernel to invalidate cache for the given node id.

 */

fs/fuse/inode.c

+2 −2
Original line number Diff line number Diff line
@@ -163,7 +163,7 @@ void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, 
	struct fuse_conn *fc = get_fuse_conn(inode);

	struct fuse_inode *fi = get_fuse_inode(inode);



	fi->attr_version = ++fc->attr_version;

	fi->attr_version = atomic64_inc_return(&fc->attr_version);

	fi->i_time = attr_valid;

	WRITE_ONCE(fi->inval_mask, 0);
@@ -624,7 +624,7 @@ void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns) 
	fc->blocked = 0;

	fc->initialized = 0;

	fc->connected = 1;

	fc->attr_version = 1;

	atomic64_set(&fc->attr_version, 1);

	get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));

	fc->pid_ns = get_pid_ns(task_active_pid_ns(current));

	fc->user_ns = get_user_ns(user_ns);

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