From: Allison Henderson <allison.henderson@oracle.com>
To: "Darrick J. Wong" <djwong@kernel.org>
Cc: linux-xfs@vger.kernel.org
Subject: Re: [PATCH v15 17/22] xfs: Skip flip flags for delayed attrs
Date: Fri, 26 Feb 2021 17:56:52 -0700 [thread overview]
Message-ID: <1a02f8a4-f6fd-de0e-c044-367f819abcce@oracle.com> (raw)
In-Reply-To: <20210226050241.GZ7272@magnolia>
On 2/25/21 10:02 PM, Darrick J. Wong wrote:
> On Thu, Feb 18, 2021 at 09:53:43AM -0700, Allison Henderson wrote:
>> This is a clean up patch that skips the flip flag logic for delayed attr
>> renames. Since the log replay keeps the inode locked, we do not need to
>> worry about race windows with attr lookups. So we can skip over
>> flipping the flag and the extra transaction roll for it
>>
>> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
>
> I wonder, have you done much performance analysis of the old vs. new
> xattr code paths? Does skipping the extra step + roll make attr
> operations faster?
I dont have any analysis right now, but maybe I could put some together.
I'm sure there's some impact, but not sure how much. If it does, I
suspect it will become of more interest when we bring in pptrs since the
code path with be in heavier use then.
>
> This looks pretty straightforward though:
> Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Thank you!
Allison
>
> --D
>
>> ---
>> fs/xfs/libxfs/xfs_attr.c | 51 +++++++++++++++++++++++++------------------
>> fs/xfs/libxfs/xfs_attr_leaf.c | 3 ++-
>> 2 files changed, 32 insertions(+), 22 deletions(-)
>>
>> diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
>> index e4c1b4b..666cc69 100644
>> --- a/fs/xfs/libxfs/xfs_attr.c
>> +++ b/fs/xfs/libxfs/xfs_attr.c
>> @@ -337,6 +337,7 @@ xfs_attr_set_iter(
>> struct xfs_da_state *state = NULL;
>> int forkoff, error = 0;
>> int retval = 0;
>> + struct xfs_mount *mp = args->dp->i_mount;
>>
>> /* State machine switch */
>> switch (dac->dela_state) {
>> @@ -470,16 +471,21 @@ xfs_attr_set_iter(
>> * "old" attr and clear the incomplete flag on the "new" attr.
>> */
>>
>> - error = xfs_attr3_leaf_flipflags(args);
>> - if (error)
>> - return error;
>> - /*
>> - * Commit the flag value change and start the next trans in
>> - * series.
>> - */
>> - dac->dela_state = XFS_DAS_FLIP_LFLAG;
>> - trace_xfs_attr_set_iter_return(dac->dela_state, args->dp);
>> - return -EAGAIN;
>> + if (!xfs_hasdelattr(mp)) {
>> + error = xfs_attr3_leaf_flipflags(args);
>> + if (error)
>> + return error;
>> + /*
>> + * Commit the flag value change and start the next trans
>> + * in series.
>> + */
>> + dac->dela_state = XFS_DAS_FLIP_LFLAG;
>> + trace_xfs_attr_set_iter_return(dac->dela_state,
>> + args->dp);
>> + return -EAGAIN;
>> + }
>> +
>> + /* fallthrough */
>> case XFS_DAS_FLIP_LFLAG:
>> /*
>> * Dismantle the "old" attribute/value pair by removing a
>> @@ -588,17 +594,21 @@ xfs_attr_set_iter(
>> * In a separate transaction, set the incomplete flag on the
>> * "old" attr and clear the incomplete flag on the "new" attr.
>> */
>> - error = xfs_attr3_leaf_flipflags(args);
>> - if (error)
>> - goto out;
>> - /*
>> - * Commit the flag value change and start the next trans in
>> - * series
>> - */
>> - dac->dela_state = XFS_DAS_FLIP_NFLAG;
>> - trace_xfs_attr_set_iter_return(dac->dela_state, args->dp);
>> - return -EAGAIN;
>> + if (!xfs_hasdelattr(mp)) {
>> + error = xfs_attr3_leaf_flipflags(args);
>> + if (error)
>> + goto out;
>> + /*
>> + * Commit the flag value change and start the next trans
>> + * in series
>> + */
>> + dac->dela_state = XFS_DAS_FLIP_NFLAG;
>> + trace_xfs_attr_set_iter_return(dac->dela_state,
>> + args->dp);
>> + return -EAGAIN;
>> + }
>>
>> + /* fallthrough */
>> case XFS_DAS_FLIP_NFLAG:
>> /*
>> * Dismantle the "old" attribute/value pair by removing a
>> @@ -1277,7 +1287,6 @@ int xfs_attr_node_addname_work(
>> * Re-find the "old" attribute entry after any split ops. The INCOMPLETE
>> * flag means that we will find the "old" attr, not the "new" one.
>> */
>> - args->attr_filter |= XFS_ATTR_INCOMPLETE;
>> state = xfs_da_state_alloc(args);
>> state->inleaf = 0;
>> error = xfs_da3_node_lookup_int(state, &retval);
>> diff --git a/fs/xfs/libxfs/xfs_attr_leaf.c b/fs/xfs/libxfs/xfs_attr_leaf.c
>> index 3780141..ec707bd 100644
>> --- a/fs/xfs/libxfs/xfs_attr_leaf.c
>> +++ b/fs/xfs/libxfs/xfs_attr_leaf.c
>> @@ -1486,7 +1486,8 @@ xfs_attr3_leaf_add_work(
>> if (tmp)
>> entry->flags |= XFS_ATTR_LOCAL;
>> if (args->op_flags & XFS_DA_OP_RENAME) {
>> - entry->flags |= XFS_ATTR_INCOMPLETE;
>> + if (!xfs_hasdelattr(mp))
>> + entry->flags |= XFS_ATTR_INCOMPLETE;
>> if ((args->blkno2 == args->blkno) &&
>> (args->index2 <= args->index)) {
>> args->index2++;
>> --
>> 2.7.4
>>
next prev parent reply other threads:[~2021-02-27 0:57 UTC|newest]
Thread overview: 87+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-18 16:53 [PATCH v15 00/22] xfs: Delayed Attributes Allison Henderson
2021-02-18 16:53 ` [PATCH v15 01/22] xfs: Add helper xfs_attr_node_remove_step Allison Henderson
2021-02-24 15:03 ` Brian Foster
2021-02-25 6:17 ` Allison Henderson
2021-02-18 16:53 ` [PATCH v15 02/22] xfs: Add xfs_attr_node_remove_cleanup Allison Henderson
2021-02-24 15:03 ` Brian Foster
2021-02-25 6:17 ` Allison Henderson
2021-02-26 3:00 ` Darrick J. Wong
2021-02-27 0:48 ` Allison Henderson
2021-02-18 16:53 ` [PATCH v15 03/22] xfs: Hoist transaction handling in xfs_attr_node_remove_step Allison Henderson
2021-02-24 15:04 ` Brian Foster
2021-02-25 6:18 ` Allison Henderson
2021-02-26 3:02 ` Darrick J. Wong
2021-02-27 0:48 ` Allison Henderson
2021-02-18 16:53 ` [PATCH v15 04/22] xfs: Hoist xfs_attr_set_shortform Allison Henderson
2021-02-24 15:04 ` Brian Foster
2021-02-25 6:18 ` Allison Henderson
2021-02-26 3:03 ` Darrick J. Wong
2021-02-27 0:48 ` Allison Henderson
2021-02-18 16:53 ` [PATCH v15 05/22] xfs: Add helper xfs_attr_set_fmt Allison Henderson
2021-02-24 15:04 ` Brian Foster
2021-02-25 6:18 ` Allison Henderson
2021-02-26 3:07 ` Darrick J. Wong
2021-02-27 0:49 ` Allison Henderson
2021-02-18 16:53 ` [PATCH v15 06/22] xfs: Separate xfs_attr_node_addname and xfs_attr_node_addname_work Allison Henderson
2021-02-24 15:04 ` Brian Foster
2021-02-25 6:18 ` Allison Henderson
2021-02-26 4:02 ` Darrick J. Wong
2021-02-27 0:54 ` Allison Henderson
2021-03-01 18:00 ` Darrick J. Wong
2021-03-02 8:26 ` Allison Henderson
2021-02-18 16:53 ` [PATCH v15 07/22] xfs: Add helper xfs_attr_node_addname_find_attr Allison Henderson
2021-02-24 15:04 ` Brian Foster
2021-02-25 6:18 ` Allison Henderson
2021-02-26 4:06 ` Darrick J. Wong
2021-02-27 0:54 ` Allison Henderson
2021-02-18 16:53 ` [PATCH v15 08/22] xfs: Hoist xfs_attr_node_addname Allison Henderson
2021-02-24 18:42 ` Brian Foster
2021-02-25 6:19 ` Allison Henderson
2021-03-01 18:05 ` Darrick J. Wong
2021-03-02 8:26 ` Allison Henderson
2021-02-18 16:53 ` [PATCH v15 09/22] xfs: Hoist xfs_attr_leaf_addname Allison Henderson
2021-02-24 18:42 ` Brian Foster
2021-02-25 6:19 ` Allison Henderson
2021-02-25 14:20 ` Brian Foster
2021-03-01 18:19 ` Darrick J. Wong
2021-03-02 8:26 ` Allison Henderson
2021-02-18 16:53 ` [PATCH v15 10/22] xfs: Hoist node transaction handling Allison Henderson
2021-02-24 18:43 ` Brian Foster
2021-02-25 6:20 ` Allison Henderson
2021-03-01 18:20 ` Darrick J. Wong
2021-03-02 8:26 ` Allison Henderson
2021-02-18 16:53 ` [PATCH v15 11/22] xfs: Add delay ready attr remove routines Allison Henderson
2021-02-24 18:45 ` Brian Foster
2021-02-25 7:01 ` Allison Henderson
2021-02-25 14:22 ` Brian Foster
2021-02-25 22:28 ` Allison Henderson
2021-02-28 15:39 ` Brian Foster
2021-03-02 8:26 ` Allison Henderson
2021-02-18 16:53 ` [PATCH v15 12/22] xfs: Add delay ready attr set routines Allison Henderson
2021-03-02 1:39 ` Darrick J. Wong
2021-02-18 16:53 ` [PATCH v15 13/22] xfs: Add state machine tracepoints Allison Henderson
2021-02-26 5:06 ` Darrick J. Wong
2021-02-27 0:57 ` Allison Henderson
2021-02-18 16:53 ` [PATCH v15 14/22] xfs: Rename __xfs_attr_rmtval_remove Allison Henderson
2021-02-18 16:53 ` [PATCH v15 15/22] xfs: Handle krealloc errors in xlog_recover_add_to_cont_trans Allison Henderson
2021-02-26 5:06 ` Darrick J. Wong
2021-02-27 0:57 ` Allison Henderson
2021-02-18 16:53 ` [PATCH v15 16/22] xfs: Set up infastructure for deferred attribute operations Allison Henderson
2021-02-26 4:58 ` Darrick J. Wong
2021-02-27 0:56 ` Allison Henderson
2021-03-02 7:13 ` Allison Henderson
2021-03-03 11:50 ` Brian Foster
2021-02-18 16:53 ` [PATCH v15 17/22] xfs: Skip flip flags for delayed attrs Allison Henderson
2021-02-26 5:02 ` Darrick J. Wong
2021-02-27 0:56 ` Allison Henderson [this message]
2021-02-18 16:53 ` [PATCH v15 18/22] xfs: Add xfs_attr_set_deferred and xfs_attr_remove_deferred Allison Henderson
2021-02-26 5:00 ` Darrick J. Wong
2021-02-27 0:57 ` Allison Henderson
2021-02-18 16:53 ` [PATCH v15 19/22] xfs: Remove unused xfs_attr_*_args Allison Henderson
2021-02-26 4:58 ` Darrick J. Wong
2021-02-27 0:57 ` Allison Henderson
2021-02-18 16:53 ` [PATCH v15 20/22] xfs: Add delayed attributes error tag Allison Henderson
2021-02-18 16:53 ` [PATCH v15 21/22] xfs: Add delattr mount option Allison Henderson
2021-02-26 4:29 ` Darrick J. Wong
2021-02-27 0:55 ` Allison Henderson
2021-02-18 16:53 ` [PATCH v15 22/22] xfs: Merge xfs_delattr_context into xfs_attr_item Allison Henderson
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