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

Allison Collins
2020-07-25T00:09:27Z

On 7/21/20 4:19 PM, Darrick J. Wong wrote:
> On Mon, Jul 20, 2020 at 05:15:46PM -0700, Allison Collins wrote:
>> 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>
>
> Looks ok,
> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Ok, thank you!

Allison
>
> --D
>
>> ---
>> 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
>>