[patch v4 06/13] [PATCH 06/13] xfs: xfs_sync_data is redundant.

[Mark Tinguely]

On 10/05/12 12:18, Ben Myers wrote:
> Index: xfs/fs/xfs/xfs_mount.h
> ===================================================================
> --- xfs.orig/fs/xfs/xfs_mount.h
> +++ xfs/fs/xfs/xfs_mount.h
> @@ -198,7 +198,6 @@ typedef struct xfs_mount {
>   #endif
>   	struct xfs_mru_cache	*m_filestream;  /* per-mount filestream data */
>   	struct delayed_work	m_reclaim_work;	/* background inode reclaim */
> -	struct work_struct	m_flush_work;	/* background inode flush */
>   	__int64_t		m_update_flags;	/* sb flags we need to update
>   						   on the next remount,rw */
>   	struct shrinker		m_inode_shrink;	/* inode reclaim shrinker */
> @@ -381,6 +380,27 @@ extern int	xfs_dev_is_read_only(struct x
>
>   extern void	xfs_set_low_space_thresholds(struct xfs_mount *);
>
> +/*
> + * Flush all dirty data to disk. Must not be called while holding an XFS_ILOCK
> + * or a page lock.
> + *
> + * We have to hold the s_umount lock here, but because this call can nest
> + * inside i_mutex (the parent directory in the create case, held by the VFS),
> + * we have to use down_read_trylock() to avoid potential deadlocks. In
> + * practice, this trylock will succeed on almost every attempt as
> + * unmount/remount type operations are exceedingly rare.
> + */
> +static inline void
> +xfs_flush_inodes(struct xfs_mount *mp)
> +{
> +	struct super_block *sb = mp->m_super;
> +
> +	if (down_read_trylock(&sb->s_umount)) {
> +		sync_inodes_sb(sb);
> +		up_read(&sb->s_umount);
> +	}
> +}
> +


Was this suppose to be in xfs_inode.h? Otherwise....

Reviewed-by: Mark Tinguely <tinguely at sgi.com>