[XFS] Allocate the struct xfs_ail

Rather than embedding the struct xfs_ail in the struct xfs_mount, allocate
it during AIL initialisation. Add a back pointer to the struct xfs_ail so
that we can pass around the xfs_ail and still be able to access the
xfs_mount if need be. This is th first step involved in isolating the AIL
implementation from the surrounding filesystem code.

SGI-PV: 988143

SGI-Modid: xfs-linux-melb:xfs-kern:32346a

Signed-off-by: David Chinner <david@fromorbit.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>

1 files changed, 2 insertions, 8 deletions

diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 67cf0b2bb848..287f90011ed5 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -63,6 +63,7 @@ struct xfs_extdelta;
 struct xfs_swapext;
 struct xfs_mru_cache;
 struct xfs_nameops;
+struct xfs_ail;
 
 /*
  * Prototypes and functions for the Data Migration subsystem.
@@ -224,18 +225,11 @@ extern void	xfs_icsb_sync_counters_locked(struct xfs_mount *, int);
 #define xfs_icsb_sync_counters_locked(mp, flags) do { } while (0)
 #endif
 
-typedef struct xfs_ail {
-        struct list_head        xa_ail;
-        uint                    xa_gen;
-        struct task_struct      *xa_task;
-        xfs_lsn_t               xa_target;
-} xfs_ail_t;
-
 typedef struct xfs_mount {
         struct super_block      *m_super;
         xfs_tid_t               m_tid;          /* next unused tid for fs */
         spinlock_t              m_ail_lock;     /* fs AIL mutex */
-        xfs_ail_t               m_ail;          /* fs active log item list */
+        struct xfs_ail          *m_ail;         /* fs active log item list */
         xfs_sb_t                m_sb;           /* copy of fs superblock */
         spinlock_t              m_sb_lock;      /* sb counter lock */
         struct xfs_buf          *m_sb_bp;       /* buffer for superblock */