xfs: push down inactive transaction mgmt for truncate

Create the new xfs_inactive_truncate() function to handle the
truncate portion of xfs_inactive(). Push the locking and
transaction management into the new function.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

1 files changed, 68 insertions, 49 deletions

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index c26990b50941..7b86f643046b 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -1663,6 +1663,58 @@ xfs_release(
 }
 
 /*
+ * xfs_inactive_truncate
+ *
+ * Called to perform a truncate when an inode becomes unlinked.
+ */
+STATIC int
+xfs_inactive_truncate(
+        struct xfs_inode *ip)
+{
+        struct xfs_mount        *mp = ip->i_mount;
+        struct xfs_trans        *tp;
+        int                     error;
+
+        tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
+        error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0);
+        if (error) {
+                ASSERT(XFS_FORCED_SHUTDOWN(mp));
+                xfs_trans_cancel(tp, 0);
+                return error;
+        }
+
+        xfs_ilock(ip, XFS_ILOCK_EXCL);
+        xfs_trans_ijoin(tp, ip, 0);
+
+        /*
+         * Log the inode size first to prevent stale data exposure in the event
+         * of a system crash before the truncate completes. See the related
+         * comment in xfs_setattr_size() for details.
+         */
+        ip->i_d.di_size = 0;
+        xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+
+        error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
+        if (error)
+                goto error_trans_cancel;
+
+        ASSERT(ip->i_d.di_nextents == 0);
+
+        error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
+        if (error)
+                goto error_unlock;
+
+        xfs_iunlock(ip, XFS_ILOCK_EXCL);
+        return 0;
+
+error_trans_cancel:
+        xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
+error_unlock:
+        xfs_iunlock(ip, XFS_ILOCK_EXCL);
+        return error;
+}
+
+/*
  * xfs_inactive
  *
  * This is called when the vnode reference count for the vnode
@@ -1679,7 +1731,6 @@ xfs_inactive(
         int                     committed;
         struct xfs_trans        *tp;
         struct xfs_mount        *mp;
-        struct xfs_trans_res    *resp;
         int                     error;
         int                     truncate = 0;
 
@@ -1724,35 +1775,12 @@ xfs_inactive(
         if (error)
                 return VN_INACTIVE_CACHE;
 
-        if (S_ISLNK(ip->i_d.di_mode)) {
+        if (S_ISLNK(ip->i_d.di_mode))
                 error = xfs_inactive_symlink(ip);
-                if (error)
-                        goto out;
-        }
-
-        tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
-        resp = truncate ? &M_RES(mp)->tr_itruncate : &M_RES(mp)->tr_ifree;
-
-        error = xfs_trans_reserve(tp, resp, 0, 0);
-        if (error) {
-                ASSERT(XFS_FORCED_SHUTDOWN(mp));
-                xfs_trans_cancel(tp, 0);
-                return VN_INACTIVE_CACHE;
-        }
-
-        xfs_ilock(ip, XFS_ILOCK_EXCL);
-        xfs_trans_ijoin(tp, ip, 0);
-
-        if (truncate) {
-                ip->i_d.di_size = 0;
-                xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
-
-                error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
-                if (error)
-                        goto out_cancel;
-
-                ASSERT(ip->i_d.di_nextents == 0);
-        }
+        else if (truncate)
+                error = xfs_inactive_truncate(ip);
+        if (error)
+                goto out;
 
         /*
          * If there are attributes associated with the file then blow them away
@@ -1763,25 +1791,9 @@ xfs_inactive(
         if (ip->i_d.di_anextents > 0) {
                 ASSERT(ip->i_d.di_forkoff != 0);
 
-                error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
-                if (error)
-                        goto out_unlock;
-
-                xfs_iunlock(ip, XFS_ILOCK_EXCL);
-
                 error = xfs_attr_inactive(ip);
                 if (error)
                         goto out;
-
-                tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
-                error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ifree, 0, 0);
-                if (error) {
-                        xfs_trans_cancel(tp, 0);
-                        goto out;
-                }
-
-                xfs_ilock(ip, XFS_ILOCK_EXCL);
-                xfs_trans_ijoin(tp, ip, 0);
         }
 
         if (ip->i_afp)
@@ -1789,6 +1801,17 @@ xfs_inactive(
 
         ASSERT(ip->i_d.di_anextents == 0);
 
+        tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
+        error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ifree, 0, 0);
+        if (error) {
+                ASSERT(XFS_FORCED_SHUTDOWN(mp));
+                xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES);
+                goto out;
+        }
+
+        xfs_ilock(ip, XFS_ILOCK_EXCL);
+        xfs_trans_ijoin(tp, ip, 0);
+
         /*
          * Free the inode.
          */
@@ -1831,13 +1854,9 @@ xfs_inactive(
          * Release the dquots held by inode, if any.
          */
         xfs_qm_dqdetach(ip);
-out_unlock:
         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 out:
         return VN_INACTIVE_CACHE;
-out_cancel:
-        xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
-        goto out_unlock;
 }
 
 /*