xfs: xfs_defer_capture should absorb remaining transaction reservation

When xfs_defer_capture extracts the deferred ops and transaction state
from a transaction, it should record the transaction reservation type
from the old transaction so that when we continue the dfops chain, we
still use the same reservation parameters.

Doing this means that the log item recovery functions get to determine
the transaction reservation instead of abusing tr_itruncate in yet
another part of xfs.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

diff --git a/fs/xfs/libxfs/xfs_defer.c b/fs/xfs/libxfs/xfs_defer.c
index 10aeae7..e19dc1c 100644 (file)
--- a/fs/xfs/libxfs/xfs_defer.c
+++ b/fs/xfs/libxfs/xfs_defer.c
@@ -579,6 +579,9 @@ xfs_defer_ops_capture(
        dfc->dfc_blkres = tp->t_blk_res - tp->t_blk_res_used;
        dfc->dfc_rtxres = tp->t_rtx_res - tp->t_rtx_res_used;
 
+       /* Preserve the log reservation size. */
+       dfc->dfc_logres = tp->t_log_res;
+
        return dfc;
 }
 

diff --git a/fs/xfs/libxfs/xfs_defer.h b/fs/xfs/libxfs/xfs_defer.h
index 5c0e59b..6cde6f0 100644 (file)
--- a/fs/xfs/libxfs/xfs_defer.h
+++ b/fs/xfs/libxfs/xfs_defer.h
@@ -79,6 +79,9 @@ struct xfs_defer_capture {
        /* Block reservations for the data and rt devices. */
        unsigned int            dfc_blkres;
        unsigned int            dfc_rtxres;
+
+       /* Log reservation saved from the transaction. */
+       unsigned int            dfc_logres;
 };
 
 /*

diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 1be5208..001e158 100644 (file)
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -2442,9 +2442,20 @@ xlog_finish_defer_ops(
        int                     error = 0;
 
        list_for_each_entry_safe(dfc, next, capture_list, dfc_list) {
-               error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate,
-                               dfc->dfc_blkres, dfc->dfc_rtxres,
-                               XFS_TRANS_RESERVE, &tp);
+               struct xfs_trans_res    resv;
+
+               /*
+                * Create a new transaction reservation from the captured
+                * information.  Set logcount to 1 to force the new transaction
+                * to regrant every roll so that we can make forward progress
+                * in recovery no matter how full the log might be.
+                */
+               resv.tr_logres = dfc->dfc_logres;
+               resv.tr_logcount = 1;
+               resv.tr_logflags = XFS_TRANS_PERM_LOG_RES;
+
+               error = xfs_trans_alloc(mp, &resv, dfc->dfc_blkres,
+                               dfc->dfc_rtxres, XFS_TRANS_RESERVE, &tp);
                if (error)
                        return error;