From: Chandan Babu R <chandanrlinux@gmail.com>
To: Allison Henderson <allison.henderson@oracle.com>
Cc: linux-xfs@vger.kernel.org
Subject: Re: [PATCH v22 07/16] xfs: Handle krealloc errors in xlog_recover_add_to_cont_trans
Date: Thu, 29 Jul 2021 13:57:31 +0530 [thread overview]
Message-ID: <874kcdfrt8.fsf@garuda> (raw)
In-Reply-To: <20210727062053.11129-8-allison.henderson@oracle.com>
On 27 Jul 2021 at 11:50, Allison Henderson wrote:
> Because xattrs can be over a page in size, we need to handle possible
> krealloc errors to avoid warnings. If the allocation does fail, fall
> back to kmem_alloc_large, with a memcpy.
>
> The warning:
> WARNING: CPU: 1 PID: 20255 at mm/page_alloc.c:3446
> get_page_from_freelist+0x100b/0x1690
>
> is caused when sizes larger that a page are allocated with the
> __GFP_NOFAIL flag option. We encounter this error now because attr
> values can be up to 64k in size. So we cannot use __GFP_NOFAIL, and
> we need to handle the error code if the allocation fails.
>
Looks good to me.
Reviewed-by: Chandan Babu R <chandanrlinux@gmail.com>
> Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
> Reviewed-by: Darrick J. Wong <djwong@kernel.org>
> ---
> fs/xfs/xfs_log_recover.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
> index 12118d5..1212fa1 100644
> --- a/fs/xfs/xfs_log_recover.c
> +++ b/fs/xfs/xfs_log_recover.c
> @@ -2088,7 +2088,15 @@ xlog_recover_add_to_cont_trans(
> old_ptr = item->ri_buf[item->ri_cnt-1].i_addr;
> old_len = item->ri_buf[item->ri_cnt-1].i_len;
>
> - ptr = krealloc(old_ptr, len + old_len, GFP_KERNEL | __GFP_NOFAIL);
> + ptr = krealloc(old_ptr, len + old_len, GFP_KERNEL);
> + if (ptr == NULL) {
> + ptr = kmem_alloc_large(len + old_len, KM_ZERO);
> + if (ptr == NULL)
> + return -ENOMEM;
> +
> + memcpy(ptr, old_ptr, old_len);
> + }
> +
> memcpy(&ptr[old_len], dp, len);
> item->ri_buf[item->ri_cnt-1].i_len += len;
> item->ri_buf[item->ri_cnt-1].i_addr = ptr;
--
chandan
next prev parent reply other threads:[~2021-07-29 8:27 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-27 6:20 [PATCH v22 00/16] Delayed Attributes Allison Henderson
2021-07-27 6:20 ` [PATCH v22 01/16] xfs: allow setting and clearing of log incompat feature flags Allison Henderson
2021-07-27 12:24 ` Chandan Babu R
2021-07-28 9:01 ` Allison Henderson
2021-07-27 6:20 ` [PATCH v22 02/16] xfs: clear log incompat feature bits when the log is idle Allison Henderson
2021-07-27 12:46 ` Chandan Babu R
2021-07-28 9:02 ` Allison Henderson
2021-07-27 6:20 ` [PATCH v22 03/16] xfs: refactor xfs_iget calls from log intent recovery Allison Henderson
2021-07-28 11:54 ` Chandan Babu R
2021-07-30 9:17 ` Allison Henderson
2021-07-27 6:20 ` [PATCH v22 04/16] xfs: Return from xfs_attr_set_iter if there are no more rmtblks to process Allison Henderson
2021-07-27 23:30 ` Darrick J. Wong
2021-07-28 9:01 ` Allison Henderson
2021-07-28 12:18 ` Chandan Babu R
2021-07-30 9:17 ` Allison Henderson
2021-08-09 17:24 ` Darrick J. Wong
2021-07-27 6:20 ` [PATCH v22 05/16] xfs: Add state machine tracepoints Allison Henderson
2021-07-28 13:42 ` Chandan Babu R
2021-07-30 9:17 ` Allison Henderson
2021-07-27 6:20 ` [PATCH v22 06/16] xfs: Rename __xfs_attr_rmtval_remove Allison Henderson
2021-07-29 7:56 ` Chandan Babu R
2021-07-30 9:17 ` Allison Henderson
2021-07-27 6:20 ` [PATCH v22 07/16] xfs: Handle krealloc errors in xlog_recover_add_to_cont_trans Allison Henderson
2021-07-29 8:27 ` Chandan Babu R [this message]
2021-07-30 9:17 ` Allison Henderson
2021-07-27 6:20 ` [PATCH v22 08/16] xfs: Set up infrastructure for deferred attribute operations Allison Henderson
2021-07-28 0:56 ` Darrick J. Wong
2021-07-28 9:04 ` Allison Henderson
2021-07-30 4:46 ` Chandan Babu R
2021-07-30 9:17 ` Allison Henderson
2021-07-27 6:20 ` [PATCH v22 09/16] xfs: Implement attr logging and replay Allison Henderson
2021-07-27 9:38 ` Chandan Babu R
2021-07-28 9:01 ` Allison Henderson
2021-07-28 0:39 ` Darrick J. Wong
2021-07-28 9:05 ` Allison Henderson
2021-07-30 12:21 ` Chandan Babu R
2021-08-02 8:33 ` Allison Henderson
2021-07-27 6:20 ` [PATCH v22 10/16] RFC xfs: Skip flip flags for delayed attrs Allison Henderson
2021-07-28 19:18 ` Darrick J. Wong
2021-07-31 5:11 ` Allison Henderson
2021-08-02 7:47 ` Allison Henderson
2021-07-30 14:40 ` Chandan Babu R
2021-08-02 8:33 ` Allison Henderson
2021-07-27 6:20 ` [PATCH v22 11/16] xfs: Add xfs_attr_set_deferred and xfs_attr_remove_deferred Allison Henderson
2021-07-28 19:24 ` Darrick J. Wong
2021-08-02 8:18 ` Allison Henderson
2021-07-30 14:58 ` Chandan Babu R
2021-08-02 8:33 ` Allison Henderson
2021-07-27 6:20 ` [PATCH v22 12/16] xfs: Remove unused xfs_attr_*_args Allison Henderson
2021-07-28 19:31 ` Darrick J. Wong
2021-08-02 8:11 ` Allison Henderson
2021-08-02 3:26 ` Chandan Babu R
2021-08-02 8:33 ` Allison Henderson
2021-07-27 6:20 ` [PATCH v22 13/16] xfs: Add delayed attributes error tag Allison Henderson
2021-08-02 3:27 ` Chandan Babu R
2021-08-02 8:33 ` Allison Henderson
2021-07-27 6:20 ` [PATCH v22 14/16] xfs: Add delattr mount option Allison Henderson
2021-07-28 0:47 ` Darrick J. Wong
2021-07-28 2:13 ` Dave Chinner
2021-07-28 9:05 ` Allison Henderson
2021-07-28 9:02 ` Allison Henderson
2021-07-27 6:20 ` [PATCH v22 15/16] xfs: Merge xfs_delattr_context into xfs_attr_item Allison Henderson
2021-08-02 3:27 ` Chandan Babu R
2021-08-02 8:33 ` Allison Henderson
2021-07-27 6:20 ` [PATCH v22 16/16] xfs: Add helper function xfs_attr_leaf_addname Allison Henderson
2021-07-28 19:52 ` Darrick J. Wong
2021-08-02 8:18 ` Allison Henderson
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