From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Source kernel commit: 4f9a60c48078c0efa3459678fa8d6e050e8ada5d
When xfs_defer_capture extracts the deferred ops and transaction state
from a transaction, it should record the remaining block reservations so
that when we continue the dfops chain, we can reserve the same number of
blocks to use. We capture the reservations for both data and realtime
volumes.
This adds the requirement that every log intent item recovery function
must be careful to reserve enough blocks to handle both itself and all
defer ops that it can queue. On the other hand, this enables us to do
away with the handwaving block estimation nonsense that was going on in
xlog_finish_defer_ops.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
include/xfs_trans.h | 2 ++
libxfs/trans.c | 1 +
libxfs/xfs_defer.c | 4 ++++
libxfs/xfs_defer.h | 4 ++++
4 files changed, 11 insertions(+)
diff --git a/include/xfs_trans.h b/include/xfs_trans.h
index 9292a4a54237..f19914068030 100644
--- a/include/xfs_trans.h
+++ b/include/xfs_trans.h
@@ -64,9 +64,11 @@ typedef struct xfs_trans {
unsigned int t_log_res; /* amt of log space resvd */
unsigned int t_log_count; /* count for perm log res */
unsigned int t_blk_res; /* # of blocks resvd */
+ unsigned int t_rtx_res;
xfs_fsblock_t t_firstblock; /* first block allocated */
struct xfs_mount *t_mountp; /* ptr to fs mount struct */
unsigned int t_blk_res_used; /* # of resvd blocks used */
+ unsigned int t_rtx_res_used;
unsigned int t_flags; /* misc flags */
long t_icount_delta; /* superblock icount change */
long t_ifree_delta; /* superblock ifree change */
diff --git a/libxfs/trans.c b/libxfs/trans.c
index 6838b727350b..6499a30aef05 100644
--- a/libxfs/trans.c
+++ b/libxfs/trans.c
@@ -230,6 +230,7 @@ xfs_trans_reserve(
error = -ENOSPC;
goto undo_blocks;
}
+ tp->t_rtx_res += rtextents;
}
return 0;
diff --git a/libxfs/xfs_defer.c b/libxfs/xfs_defer.c
index 90dc9ce92106..fc5c860e5d56 100644
--- a/libxfs/xfs_defer.c
+++ b/libxfs/xfs_defer.c
@@ -573,6 +573,10 @@ xfs_defer_ops_capture(
dfc->dfc_tpflags = tp->t_flags & XFS_TRANS_LOWMODE;
tp->t_flags &= ~XFS_TRANS_LOWMODE;
+ /* Capture the remaining block reservations along with the dfops. */
+ dfc->dfc_blkres = tp->t_blk_res - tp->t_blk_res_used;
+ dfc->dfc_rtxres = tp->t_rtx_res - tp->t_rtx_res_used;
+
return dfc;
}
diff --git a/libxfs/xfs_defer.h b/libxfs/xfs_defer.h
index 3af82ebc1249..5c0e59b69ffa 100644
--- a/libxfs/xfs_defer.h
+++ b/libxfs/xfs_defer.h
@@ -75,6 +75,10 @@ struct xfs_defer_capture {
/* Deferred ops state saved from the transaction. */
struct list_head dfc_dfops;
unsigned int dfc_tpflags;
+
+ /* Block reservations for the data and rt devices. */
+ unsigned int dfc_blkres;
+ unsigned int dfc_rtxres;
};
/*
