Re: [PATCH v11 2/4] xfs: use memalloc_nofs_{save,restore} in xfs transaction

Darrick J. Wong
2020-12-08T21:54:28Z

On Tue, Dec 08, 2020 at 08:28:22PM +0800, Yafang Shao wrote:
> Introduce a new API to mark the start and end of XFS transactions.
> For now, just save and restore the memalloc_nofs flags.
>
> The new helpers as follows,
> - xfs_trans_context_set
> Mark the start of XFS transactions
> - xfs_trans_context_clear
> Mark the end of XFS transactions
>
> Cc: Darrick J. Wong <darrick.wong@oracle.com>
> Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
> Cc: Christoph Hellwig <hch@lst.de>
> Cc: Dave Chinner <david@fromorbit.com>
> Cc: Michal Hocko <mhocko@kernel.org>
> Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
> ---
> fs/xfs/xfs_aops.c | 4 ++--
> fs/xfs/xfs_linux.h | 4 ----
> fs/xfs/xfs_trans.c | 13 +++++++------
> fs/xfs/xfs_trans.h | 12 ++++++++++++
> 4 files changed, 21 insertions(+), 12 deletions(-)
>
> diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
> index 4304c6416fbb..2371187b7615 100644
> --- a/fs/xfs/xfs_aops.c
> +++ b/fs/xfs/xfs_aops.c
> @@ -62,7 +62,7 @@ xfs_setfilesize_trans_alloc(
> * We hand off the transaction to the completion thread now, so
> * clear the flag here.
> */
> - current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
> + xfs_trans_context_clear(tp);
> return 0;
> }
>
> @@ -125,7 +125,7 @@ xfs_setfilesize_ioend(
> * thus we need to mark ourselves as being in a transaction manually.
> * Similarly for freeze protection.
> */
> - current_set_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
> + xfs_trans_context_set(tp);
> __sb_writers_acquired(VFS_I(ip)->i_sb, SB_FREEZE_FS);
>
> /* we abort the update if there was an IO error */
> diff --git a/fs/xfs/xfs_linux.h b/fs/xfs/xfs_linux.h
> index 5b7a1e201559..6ab0f8043c73 100644
> --- a/fs/xfs/xfs_linux.h
> +++ b/fs/xfs/xfs_linux.h
> @@ -102,10 +102,6 @@ typedef __u32 xfs_nlink_t;
> #define xfs_cowb_secs xfs_params.cowb_timer.val
>
> #define current_cpu() (raw_smp_processor_id())
> -#define current_set_flags_nested(sp, f) \
> - (*(sp) = current->flags, current->flags |= (f))
> -#define current_restore_flags_nested(sp, f) \
> - (current->flags = ((current->flags & ~(f)) | (*(sp) & (f))))
>
> #define NBBY 8 /* number of bits per byte */
>
> diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
> index c94e71f741b6..11d390f0d3f2 100644
> --- a/fs/xfs/xfs_trans.c
> +++ b/fs/xfs/xfs_trans.c
> @@ -154,7 +154,7 @@ xfs_trans_reserve(
> bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
>
> /* Mark this thread as being in a transaction */
> - current_set_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
> + xfs_trans_context_set(tp);
>
> /*
> * Attempt to reserve the needed disk blocks by decrementing
> @@ -164,7 +164,7 @@ xfs_trans_reserve(
> if (blocks > 0) {
> error = xfs_mod_fdblocks(mp, -((int64_t)blocks), rsvd);
> if (error != 0) {
> - current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
> + xfs_trans_context_clear(tp);
> return -ENOSPC;
> }
> tp->t_blk_res += blocks;
> @@ -241,7 +241,7 @@ xfs_trans_reserve(
> tp->t_blk_res = 0;
> }
>
> - current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
> + xfs_trans_context_clear(tp);
>
> return error;
> }
> @@ -878,7 +878,7 @@ __xfs_trans_commit(
>
> xfs_log_commit_cil(mp, tp, &commit_lsn, regrant);
>
> - current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
> + xfs_trans_context_clear(tp);
> xfs_trans_free(tp);
>
> /*
> @@ -910,7 +910,8 @@ __xfs_trans_commit(
> xfs_log_ticket_ungrant(mp->m_log, tp->t_ticket);
> tp->t_ticket = NULL;
> }
> - current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
> +
> + xfs_trans_context_clear(tp);
> xfs_trans_free_items(tp, !!error);
> xfs_trans_free(tp);
>
> @@ -971,7 +972,7 @@ xfs_trans_cancel(
> }
>
> /* mark this thread as no longer being in a transaction */
> - current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
> + xfs_trans_context_clear(tp);
>
> xfs_trans_free_items(tp, dirty);
> xfs_trans_free(tp);
> diff --git a/fs/xfs/xfs_trans.h b/fs/xfs/xfs_trans.h
> index 084658946cc8..44b11c64a15e 100644
> --- a/fs/xfs/xfs_trans.h
> +++ b/fs/xfs/xfs_trans.h
> @@ -268,4 +268,16 @@ xfs_trans_item_relog(
> return lip->li_ops->iop_relog(lip, tp);
> }
>
> +static inline void
> +xfs_trans_context_set(struct xfs_trans *tp)
> +{
> + tp->t_pflags = memalloc_nofs_save();
> +}
> +
> +static inline void
> +xfs_trans_context_clear(struct xfs_trans *tp)
> +{
> + memalloc_nofs_restore(tp->t_pflags);

It's a little strange to add the wrappers and convert the current->flags
modification macros to the memalloc_nofs_* functions in one patch, but
whatever, I'm more concerned about the things I complained about in the
next two patches.

Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>

--D

> +}
> +
> #endif /* __XFS_TRANS_H__ */
> --
> 2.18.4
>