On Tue, Sep 10, 2024 at 07:28:44AM +0300, Christoph Hellwig wrote:
> Currently only the new agcount is passed to xfs_initialize_perag, which
> requires lookups of existing AGs to skip them and complicates error
> handling. Also pass the previous agcount so that the range that
> xfs_initialize_perag operates on is exactly defined. That way the
> extra lookups can be avoided, and error handling can clean up the
> exact range from the old count to the last added perag structure.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
> fs/xfs/libxfs/xfs_ag.c | 23 +++++------------------
> fs/xfs/libxfs/xfs_ag.h | 5 +++--
> fs/xfs/xfs_fsops.c | 18 ++++++++----------
> fs/xfs/xfs_log_recover.c | 5 +++--
> fs/xfs/xfs_mount.c | 4 ++--
> 5 files changed, 21 insertions(+), 34 deletions(-)
>
> diff --git a/fs/xfs/libxfs/xfs_ag.c b/fs/xfs/libxfs/xfs_ag.c
> index 5f0494702e0b55..5186735da5d45a 100644
> --- a/fs/xfs/libxfs/xfs_ag.c
> +++ b/fs/xfs/libxfs/xfs_ag.c
> @@ -296,27 +296,19 @@ xfs_free_unused_perag_range(
> int
> xfs_initialize_perag(
> struct xfs_mount *mp,
> + xfs_agnumber_t old_agcount,
> xfs_agnumber_t agcount,
Might want to rename this new_agcount for clarity?
Otherwise looks pretty straightforward to me, so:
Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx>
--D
> xfs_rfsblock_t dblocks,
> xfs_agnumber_t *maxagi)
> {
> struct xfs_perag *pag;
> xfs_agnumber_t index;
> - xfs_agnumber_t first_initialised = NULLAGNUMBER;
> int error;
>
> - /*
> - * Walk the current per-ag tree so we don't try to initialise AGs
> - * that already exist (growfs case). Allocate and insert all the
> - * AGs we don't find ready for initialisation.
> - */
> - for (index = 0; index < agcount; index++) {
> - pag = xfs_perag_get(mp, index);
> - if (pag) {
> - xfs_perag_put(pag);
> - continue;
> - }
> + if (old_agcount >= agcount)
> + return 0;
>
> + for (index = old_agcount; index < agcount; index++) {
> pag = kzalloc(sizeof(*pag), GFP_KERNEL | __GFP_RETRY_MAYFAIL);
> if (!pag) {
> error = -ENOMEM;
> @@ -353,10 +345,6 @@ xfs_initialize_perag(
> /* Active ref owned by mount indicates AG is online. */
> atomic_set(&pag->pag_active_ref, 1);
>
> - /* first new pag is fully initialized */
> - if (first_initialised == NULLAGNUMBER)
> - first_initialised = index;
> -
> /*
> * Pre-calculated geometry
> */
> @@ -381,8 +369,7 @@ xfs_initialize_perag(
> out_free_pag:
> kfree(pag);
> out_unwind_new_pags:
> - /* unwind any prior newly initialized pags */
> - xfs_free_unused_perag_range(mp, first_initialised, agcount);
> + xfs_free_unused_perag_range(mp, old_agcount, index);
> return error;
> }
>
> diff --git a/fs/xfs/libxfs/xfs_ag.h b/fs/xfs/libxfs/xfs_ag.h
> index d9cccd093b60e0..69fc31e7b84728 100644
> --- a/fs/xfs/libxfs/xfs_ag.h
> +++ b/fs/xfs/libxfs/xfs_ag.h
> @@ -146,8 +146,9 @@ __XFS_AG_OPSTATE(agfl_needs_reset, AGFL_NEEDS_RESET)
>
> void xfs_free_unused_perag_range(struct xfs_mount *mp, xfs_agnumber_t agstart,
> xfs_agnumber_t agend);
> -int xfs_initialize_perag(struct xfs_mount *mp, xfs_agnumber_t agcount,
> - xfs_rfsblock_t dcount, xfs_agnumber_t *maxagi);
> +int xfs_initialize_perag(struct xfs_mount *mp, xfs_agnumber_t old_agcount,
> + xfs_agnumber_t agcount, xfs_rfsblock_t dcount,
> + xfs_agnumber_t *maxagi);
> int xfs_initialize_perag_data(struct xfs_mount *mp, xfs_agnumber_t agno);
> void xfs_free_perag(struct xfs_mount *mp);
>
> diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
> index 3643cc843f6271..de2bf0594cb474 100644
> --- a/fs/xfs/xfs_fsops.c
> +++ b/fs/xfs/xfs_fsops.c
> @@ -87,6 +87,7 @@ xfs_growfs_data_private(
> struct xfs_mount *mp, /* mount point for filesystem */
> struct xfs_growfs_data *in) /* growfs data input struct */
> {
> + xfs_agnumber_t oagcount = mp->m_sb.sb_agcount;
> struct xfs_buf *bp;
> int error;
> xfs_agnumber_t nagcount;
> @@ -94,7 +95,6 @@ xfs_growfs_data_private(
> xfs_rfsblock_t nb, nb_div, nb_mod;
> int64_t delta;
> bool lastag_extended = false;
> - xfs_agnumber_t oagcount;
> struct xfs_trans *tp;
> struct aghdr_init_data id = {};
> struct xfs_perag *last_pag;
> @@ -138,16 +138,14 @@ xfs_growfs_data_private(
> if (delta == 0)
> return 0;
>
> - oagcount = mp->m_sb.sb_agcount;
> - /* allocate the new per-ag structures */
> - if (nagcount > oagcount) {
> - error = xfs_initialize_perag(mp, nagcount, nb, &nagimax);
> - if (error)
> - return error;
> - } else if (nagcount < oagcount) {
> - /* TODO: shrinking the entire AGs hasn't yet completed */
> + /* TODO: shrinking the entire AGs hasn't yet completed */
> + if (nagcount < oagcount)
> return -EINVAL;
> - }
> +
> + /* allocate the new per-ag structures */
> + error = xfs_initialize_perag(mp, oagcount, nagcount, nb, &nagimax);
> + if (error)
> + return error;
>
> if (delta > 0)
> error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growdata,
> diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
> index 1a74fe22672e3e..2af02b32f419c2 100644
> --- a/fs/xfs/xfs_log_recover.c
> +++ b/fs/xfs/xfs_log_recover.c
> @@ -3346,6 +3346,7 @@ xlog_do_recover(
> struct xfs_mount *mp = log->l_mp;
> struct xfs_buf *bp = mp->m_sb_bp;
> struct xfs_sb *sbp = &mp->m_sb;
> + xfs_agnumber_t old_agcount = sbp->sb_agcount;
> int error;
>
> trace_xfs_log_recover(log, head_blk, tail_blk);
> @@ -3393,8 +3394,8 @@ xlog_do_recover(
> /* re-initialise in-core superblock and geometry structures */
> mp->m_features |= xfs_sb_version_to_features(sbp);
> xfs_reinit_percpu_counters(mp);
> - error = xfs_initialize_perag(mp, sbp->sb_agcount, sbp->sb_dblocks,
> - &mp->m_maxagi);
> + error = xfs_initialize_perag(mp, old_agcount, sbp->sb_agcount,
> + sbp->sb_dblocks, &mp->m_maxagi);
> if (error) {
> xfs_warn(mp, "Failed post-recovery per-ag init: %d", error);
> return error;
> diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
> index 460f93a9ce00d1..0f4f56a7f02d9a 100644
> --- a/fs/xfs/xfs_mount.c
> +++ b/fs/xfs/xfs_mount.c
> @@ -806,8 +806,8 @@ xfs_mountfs(
> /*
> * Allocate and initialize the per-ag data.
> */
> - error = xfs_initialize_perag(mp, sbp->sb_agcount, mp->m_sb.sb_dblocks,
> - &mp->m_maxagi);
> + error = xfs_initialize_perag(mp, 0, sbp->sb_agcount,
> + mp->m_sb.sb_dblocks, &mp->m_maxagi);
> if (error) {
> xfs_warn(mp, "Failed per-ag init: %d", error);
> goto out_free_dir;
> --
> 2.45.2
>
>
