[PATCH v11 05/25] xfs: Split apart xfs_attr_leaf_addname

Allison Collins
2020-07-21T00:16:19Z

Split out new helper function xfs_attr_leaf_try_add from
xfs_attr_leaf_addname. Because new delayed attribute routines cannot
roll transactions, we split off the parts of xfs_attr_leaf_addname that
we can use, and move the commit into the calling function.

Signed-off-by: Allison Collins <allison.henderson@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Chandan Rajendra <chandanrlinux@gmail.com>
---
fs/xfs/libxfs/xfs_attr.c | 95 +++++++++++++++++++++++++++++++-----------------
1 file changed, 61 insertions(+), 34 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index 28a9f8e..6fc6dc6 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -256,10 +256,31 @@ xfs_attr_set_args(
}
}

- if (xfs_bmap_one_block(dp, XFS_ATTR_FORK))
+ if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
error = xfs_attr_leaf_addname(args);
- else
- error = xfs_attr_node_addname(args);
+ if (error != -ENOSPC)
+ return error;
+
+ /*
+ * Finish any deferred work items and roll the transaction once
+ * more. The goal here is to call node_addname with the inode
+ * and transaction in the same state (inode locked and joined,
+ * transaction clean) no matter how we got to this step.
+ */
+ error = xfs_defer_finish(&args->trans);
+ if (error)
+ return error;
+
+ /*
+ * Commit the current trans (including the inode) and
+ * start a new one.
+ */
+ error = xfs_trans_roll_inode(&args->trans, dp);
+ if (error)
+ return error;
+ }
+
+ error = xfs_attr_node_addname(args);
return error;
}

@@ -507,20 +528,21 @@ xfs_attr_shortform_addname(xfs_da_args_t *args)
*========================================================================*/

/*
- * Add a name to the leaf attribute list structure
+ * Tries to add an attribute to an inode in leaf form
*
- * This leaf block cannot have a "remote" value, we only call this routine
- * if bmap_one_block() says there is only one block (ie: no remote blks).
+ * This function is meant to execute as part of a delayed operation and leaves
+ * the transaction handling to the caller. On success the attribute is added
+ * and the inode and transaction are left dirty. If there is not enough space,
+ * the attr data is converted to node format and -ENOSPC is returned. Caller is
+ * responsible for handling the dirty inode and transaction or adding the attr
+ * in node format.
*/
STATIC int
-xfs_attr_leaf_addname(
- struct xfs_da_args *args)
+xfs_attr_leaf_try_add(
+ struct xfs_da_args *args,
+ struct xfs_buf *bp)
{
- struct xfs_buf *bp;
- int retval, error, forkoff;
- struct xfs_inode *dp = args->dp;
-
- trace_xfs_attr_leaf_addname(args);
+ int retval, error;

/*
* Look up the given attribute in the leaf block. Figure out if
@@ -562,31 +584,39 @@ xfs_attr_leaf_addname(
retval = xfs_attr3_leaf_add(bp, args);
if (retval == -ENOSPC) {
/*
- * Promote the attribute list to the Btree format, then
- * Commit that transaction so that the node_addname() call
- * can manage its own transactions.
+ * Promote the attribute list to the Btree format. Unless an
+ * error occurs, retain the -ENOSPC retval
*/
error = xfs_attr3_leaf_to_node(args);
if (error)
return error;
- error = xfs_defer_finish(&args->trans);
- if (error)
- return error;
+ }
+ return retval;
+out_brelse:
+ xfs_trans_brelse(args->trans, bp);
+ return retval;
+}

- /*
- * Commit the current trans (including the inode) and start
- * a new one.
- */
- error = xfs_trans_roll_inode(&args->trans, dp);
- if (error)
- return error;

- /*
- * Fob the whole rest of the problem off on the Btree code.
- */
- error = xfs_attr_node_addname(args);
+/*
+ * Add a name to the leaf attribute list structure
+ *
+ * This leaf block cannot have a "remote" value, we only call this routine
+ * if bmap_one_block() says there is only one block (ie: no remote blks).
+ */
+STATIC int
+xfs_attr_leaf_addname(
+ struct xfs_da_args *args)
+{
+ int error, forkoff;
+ struct xfs_buf *bp = NULL;
+ struct xfs_inode *dp = args->dp;
+
+ trace_xfs_attr_leaf_addname(args);
+
+ error = xfs_attr_leaf_try_add(args, bp);
+ if (error)
return error;
- }

/*
* Commit the transaction that added the attr name so that
@@ -681,9 +711,6 @@ xfs_attr_leaf_addname(
error = xfs_attr3_leaf_clearflag(args);
}
return error;
-out_brelse:
- xfs_trans_brelse(args->trans, bp);
- return retval;
}

/*
--
2.7.4