xfs: remove stale parameter from ->iop_unpin method

The staleness of a object being unpinned can be directly derived
from the object itself - there is no need to extract it from the
object then pass it as a parameter into IOP_UNPIN().

This means we can kill the XFS_LID_BUF_STALE flag - it is set,
checked and cleared in the same places XFS_BLI_STALE flag in the
xfs_buf_log_item so it is now redundant and hence safe to remove.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

7 files changed, 39 insertions, 52 deletions

diff --git a/fs/xfs/quota/xfs_dquot_item.c b/fs/xfs/quota/xfs_dquot_item.c
index 639d96554a9e..165bbdf44bea 100644
--- a/fs/xfs/quota/xfs_dquot_item.c
+++ b/fs/xfs/quota/xfs_dquot_item.c
@@ -107,8 +107,7 @@ xfs_qm_dquot_logitem_pin(
 /* ARGSUSED */
 STATIC void
 xfs_qm_dquot_logitem_unpin(
-        xfs_dq_logitem_t *logitem,
-        int               stale)
+        xfs_dq_logitem_t *logitem)
 {
         xfs_dquot_t *dqp = logitem->qli_dquot;
 
@@ -123,7 +122,7 @@ xfs_qm_dquot_logitem_unpin_remove(
         xfs_dq_logitem_t *logitem,
         xfs_trans_t      *tp)
 {
-        xfs_qm_dquot_logitem_unpin(logitem, 0);
+        xfs_qm_dquot_logitem_unpin(logitem);
 }
 
 /*
@@ -329,8 +328,7 @@ static struct xfs_item_ops xfs_dquot_item_ops = {
         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
                                         xfs_qm_dquot_logitem_format,
         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_pin,
-        .iop_unpin      = (void(*)(xfs_log_item_t*, int))
-                                        xfs_qm_dquot_logitem_unpin,
+        .iop_unpin      = (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_unpin,
         .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
                                         xfs_qm_dquot_logitem_unpin_remove,
         .iop_trylock    = (uint(*)(xfs_log_item_t*))
@@ -425,7 +423,7 @@ xfs_qm_qoff_logitem_pin(xfs_qoff_logitem_t *qf)
  */
 /*ARGSUSED*/
 STATIC void
-xfs_qm_qoff_logitem_unpin(xfs_qoff_logitem_t *qf, int stale)
+xfs_qm_qoff_logitem_unpin(xfs_qoff_logitem_t *qf)
 {
         return;
 }
@@ -536,8 +534,7 @@ static struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
                                         xfs_qm_qoff_logitem_format,
         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_pin,
-        .iop_unpin      = (void(*)(xfs_log_item_t* ,int))
-                                        xfs_qm_qoff_logitem_unpin,
+        .iop_unpin      = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_unpin,
         .iop_unpin_remove = (void(*)(xfs_log_item_t*,xfs_trans_t*))
                                         xfs_qm_qoff_logitem_unpin_remove,
         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_trylock,
@@ -558,8 +555,7 @@ static struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
                                         xfs_qm_qoff_logitem_format,
         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_pin,
-        .iop_unpin      = (void(*)(xfs_log_item_t*, int))
-                                        xfs_qm_qoff_logitem_unpin,
+        .iop_unpin      = (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_unpin,
         .iop_unpin_remove = (void(*)(xfs_log_item_t*,xfs_trans_t*))
                                         xfs_qm_qoff_logitem_unpin_remove,
         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_trylock,
diff --git a/fs/xfs/xfs_buf_item.c b/fs/xfs/xfs_buf_item.c
index aace237b4f46..240340a4727b 100644
--- a/fs/xfs/xfs_buf_item.c
+++ b/fs/xfs/xfs_buf_item.c
@@ -372,12 +372,12 @@ xfs_buf_item_pin(
  */
 STATIC void
 xfs_buf_item_unpin(
-        xfs_buf_log_item_t      *bip,
-        int                     stale)
+        xfs_buf_log_item_t      *bip)
 {
         struct xfs_ail  *ailp;
         xfs_buf_t       *bp;
         int             freed;
+        int             stale = bip->bli_flags & XFS_BLI_STALE;
 
         bp = bip->bli_buf;
         ASSERT(bp != NULL);
@@ -428,40 +428,34 @@ xfs_buf_item_unpin_remove(
         xfs_buf_log_item_t      *bip,
         xfs_trans_t             *tp)
 {
-        xfs_buf_t               *bp;
-        xfs_log_item_desc_t     *lidp;
-        int                     stale = 0;
-
-        bp = bip->bli_buf;
-        /*
-         * will xfs_buf_item_unpin() call xfs_buf_item_relse()?
-         */
+        /* will xfs_buf_item_unpin() call xfs_buf_item_relse()? */
         if ((atomic_read(&bip->bli_refcount) == 1) &&
             (bip->bli_flags & XFS_BLI_STALE)) {
+                /*
+                 * yes -- We can safely do some work here and then call
+                 * buf_item_unpin to do the rest because we are
+                 * are holding the buffer locked so no one else will be
+                 * able to bump up the refcount. We have to remove the
+                 * log item from the transaction as we are about to release
+                 * our reference to the buffer. If we don't, the unlock that
+                 * occurs later in the xfs_trans_uncommit() will try to
+                 * reference the buffer which we no longer have a hold on.
+                 */
+                struct xfs_log_item_desc *lidp;
+
                 ASSERT(XFS_BUF_VALUSEMA(bip->bli_buf) <= 0);
                 trace_xfs_buf_item_unpin_stale(bip);
 
-                /*
-                 * yes -- clear the xaction descriptor in-use flag
-                 * and free the chunk if required.  We can safely
-                 * do some work here and then call buf_item_unpin
-                 * to do the rest because if the if is true, then
-                 * we are holding the buffer locked so no one else
-                 * will be able to bump up the refcount.
-                 */
-                lidp = xfs_trans_find_item(tp, (xfs_log_item_t *) bip);
-                stale = lidp->lid_flags & XFS_LID_BUF_STALE;
+                lidp = xfs_trans_find_item(tp, (xfs_log_item_t *)bip);
                 xfs_trans_free_item(tp, lidp);
+
                 /*
-                 * Since the transaction no longer refers to the buffer,
-                 * the buffer should no longer refer to the transaction.
+                 * Since the transaction no longer refers to the buffer, the
+                 * buffer should no longer refer to the transaction.
                  */
-                XFS_BUF_SET_FSPRIVATE2(bp, NULL);
+                XFS_BUF_SET_FSPRIVATE2(bip->bli_buf, NULL);
         }
-
-        xfs_buf_item_unpin(bip, stale);
-
-        return;
+        xfs_buf_item_unpin(bip);
 }
 
 /*
@@ -675,7 +669,7 @@ static struct xfs_item_ops xfs_buf_item_ops = {
         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
                                         xfs_buf_item_format,
         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_buf_item_pin,
-        .iop_unpin      = (void(*)(xfs_log_item_t*, int))xfs_buf_item_unpin,
+        .iop_unpin      = (void(*)(xfs_log_item_t*))xfs_buf_item_unpin,
         .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t *))
                                         xfs_buf_item_unpin_remove,
         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_buf_item_trylock,
diff --git a/fs/xfs/xfs_extfree_item.c b/fs/xfs/xfs_extfree_item.c
index e461e93b0350..409fe81585fd 100644
--- a/fs/xfs/xfs_extfree_item.c
+++ b/fs/xfs/xfs_extfree_item.c
@@ -106,7 +106,7 @@ xfs_efi_item_pin(xfs_efi_log_item_t *efip)
  */
 /*ARGSUSED*/
 STATIC void
-xfs_efi_item_unpin(xfs_efi_log_item_t *efip, int stale)
+xfs_efi_item_unpin(xfs_efi_log_item_t *efip)
 {
         struct xfs_ail          *ailp = efip->efi_item.li_ailp;
 
@@ -224,7 +224,7 @@ static struct xfs_item_ops xfs_efi_item_ops = {
         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
                                         xfs_efi_item_format,
         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_efi_item_pin,
-        .iop_unpin      = (void(*)(xfs_log_item_t*, int))xfs_efi_item_unpin,
+        .iop_unpin      = (void(*)(xfs_log_item_t*))xfs_efi_item_unpin,
         .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t *))
                                         xfs_efi_item_unpin_remove,
         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_efi_item_trylock,
@@ -425,7 +425,7 @@ xfs_efd_item_pin(xfs_efd_log_item_t *efdp)
  */
 /*ARGSUSED*/
 STATIC void
-xfs_efd_item_unpin(xfs_efd_log_item_t *efdp, int stale)
+xfs_efd_item_unpin(xfs_efd_log_item_t *efdp)
 {
         return;
 }
@@ -515,7 +515,7 @@ static struct xfs_item_ops xfs_efd_item_ops = {
         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
                                         xfs_efd_item_format,
         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_efd_item_pin,
-        .iop_unpin      = (void(*)(xfs_log_item_t*, int))xfs_efd_item_unpin,
+        .iop_unpin      = (void(*)(xfs_log_item_t*))xfs_efd_item_unpin,
         .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
                                         xfs_efd_item_unpin_remove,
         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_efd_item_trylock,
diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c
index 03471757bc88..cf8249a60004 100644
--- a/fs/xfs/xfs_inode_item.c
+++ b/fs/xfs/xfs_inode_item.c
@@ -557,8 +557,7 @@ xfs_inode_item_pin(
 /* ARGSUSED */
 STATIC void
 xfs_inode_item_unpin(
-        xfs_inode_log_item_t    *iip,
-        int                     stale)
+        xfs_inode_log_item_t    *iip)
 {
         struct xfs_inode        *ip = iip->ili_inode;
 
@@ -574,7 +573,7 @@ xfs_inode_item_unpin_remove(
         xfs_inode_log_item_t    *iip,
         xfs_trans_t             *tp)
 {
-        xfs_inode_item_unpin(iip, 0);
+        xfs_inode_item_unpin(iip);
 }
 
 /*
@@ -840,7 +839,7 @@ static struct xfs_item_ops xfs_inode_item_ops = {
         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
                                         xfs_inode_item_format,
         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_inode_item_pin,
-        .iop_unpin      = (void(*)(xfs_log_item_t*, int))xfs_inode_item_unpin,
+        .iop_unpin      = (void(*)(xfs_log_item_t*))xfs_inode_item_unpin,
         .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
                                         xfs_inode_item_unpin_remove,
         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_inode_item_trylock,
diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index f73e358bae8d..6962f2bd3da3 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -1451,6 +1451,6 @@ xfs_trans_chunk_committed(
                  * flags, if anyone else stales the buffer we do not
                  * want to pay any attention to it.
                  */
-                IOP_UNPIN(lip, lidp->lid_flags & XFS_LID_BUF_STALE);
+                IOP_UNPIN(lip);
         }
 }
diff --git a/fs/xfs/xfs_trans.h b/fs/xfs/xfs_trans.h
index 79c8bab9dfff..82574ef36580 100644
--- a/fs/xfs/xfs_trans.h
+++ b/fs/xfs/xfs_trans.h
@@ -159,7 +159,6 @@ typedef struct xfs_log_item_desc {
 
 #define XFS_LID_DIRTY           0x1
 #define XFS_LID_PINNED          0x2
-#define XFS_LID_BUF_STALE       0x8
 
 /*
  * This structure is used to maintain a chunk list of log_item_desc
@@ -833,7 +832,7 @@ typedef struct xfs_item_ops {
         uint (*iop_size)(xfs_log_item_t *);
         void (*iop_format)(xfs_log_item_t *, struct xfs_log_iovec *);
         void (*iop_pin)(xfs_log_item_t *);
-        void (*iop_unpin)(xfs_log_item_t *, int);
+        void (*iop_unpin)(xfs_log_item_t *);
         void (*iop_unpin_remove)(xfs_log_item_t *, struct xfs_trans *);
         uint (*iop_trylock)(xfs_log_item_t *);
         void (*iop_unlock)(xfs_log_item_t *);
@@ -846,7 +845,7 @@ typedef struct xfs_item_ops {
 #define IOP_SIZE(ip)            (*(ip)->li_ops->iop_size)(ip)
 #define IOP_FORMAT(ip,vp)       (*(ip)->li_ops->iop_format)(ip, vp)
 #define IOP_PIN(ip)             (*(ip)->li_ops->iop_pin)(ip)
-#define IOP_UNPIN(ip, flags)    (*(ip)->li_ops->iop_unpin)(ip, flags)
+#define IOP_UNPIN(ip)           (*(ip)->li_ops->iop_unpin)(ip)
 #define IOP_UNPIN_REMOVE(ip,tp) (*(ip)->li_ops->iop_unpin_remove)(ip, tp)
 #define IOP_TRYLOCK(ip)         (*(ip)->li_ops->iop_trylock)(ip)
 #define IOP_UNLOCK(ip)          (*(ip)->li_ops->iop_unlock)(ip)
diff --git a/fs/xfs/xfs_trans_buf.c b/fs/xfs/xfs_trans_buf.c
index fb586360d1c9..4e1b6892c106 100644
--- a/fs/xfs/xfs_trans_buf.c
+++ b/fs/xfs/xfs_trans_buf.c
@@ -696,7 +696,6 @@ xfs_trans_log_buf(xfs_trans_t	*tp,
 
         tp->t_flags |= XFS_TRANS_DIRTY;
         lidp->lid_flags |= XFS_LID_DIRTY;
-        lidp->lid_flags &= ~XFS_LID_BUF_STALE;
         bip->bli_flags |= XFS_BLI_LOGGED;
         xfs_buf_item_log(bip, first, last);
 }
@@ -782,7 +781,7 @@ xfs_trans_binval(
         bip->bli_format.blf_flags |= XFS_BLI_CANCEL;
         memset((char *)(bip->bli_format.blf_data_map), 0,
               (bip->bli_format.blf_map_size * sizeof(uint)));
-        lidp->lid_flags |= XFS_LID_DIRTY|XFS_LID_BUF_STALE;
+        lidp->lid_flags |= XFS_LID_DIRTY;
         tp->t_flags |= XFS_TRANS_DIRTY;
 }