[PATCH 2/8] xfs: re-order initial space accounting checks in xlog_write
From: Christoph Hellwig <hch@lst.de>
Date: 2020-03-25 18:49:44
Subsystem:
filesystems (vfs and infrastructure), the rest, xfs filesystem · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds, Carlos Maiolino
From: Dave Chinner <redacted> Commit and unmount records records do not need start records to be written, so rearrange the logic in xlog_write() to remove the need to check for XLOG_TIC_INITED to determine if we should account for the space used by a start record. Signed-off-by: Dave Chinner <redacted> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Brian Foster <redacted> Reviewed-by: Darrick J. Wong <redacted> --- fs/xfs/xfs_log.c | 31 ++++++++++--------------------- 1 file changed, 10 insertions(+), 21 deletions(-)
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 617b393272de..c14f8f14a381 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c@@ -2350,10 +2350,10 @@ xlog_write( bool need_start_rec) { struct xlog_in_core *iclog = NULL; - struct xfs_log_iovec *vecp; - struct xfs_log_vec *lv; + struct xfs_log_vec *lv = log_vector; + struct xfs_log_iovec *vecp = lv->lv_iovecp; + int index = 0; int len; - int index; int partial_copy = 0; int partial_copy_len = 0; int contwr = 0;
@@ -2361,24 +2361,16 @@ xlog_write( int data_cnt = 0; int error = 0; - *start_lsn = 0; - - /* - * Region headers and bytes are already accounted for. We only need to - * take into account start records and split regions in this function. + * If this is a commit or unmount transaction, we don't need a start + * record to be written. We do, however, have to account for the + * commit or unmount header that gets written. Hence we always have + * to account for an extra xlog_op_header here. */ - if (ticket->t_flags & XLOG_TIC_INITED) { - ticket->t_curr_res -= sizeof(struct xlog_op_header); + ticket->t_curr_res -= sizeof(struct xlog_op_header); + if (ticket->t_flags & XLOG_TIC_INITED) ticket->t_flags &= ~XLOG_TIC_INITED; - } - /* - * Commit record headers and unmount records need to be accounted for. - * These come in as separate writes so are easy to detect. - */ - if (!need_start_rec) - ticket->t_curr_res -= sizeof(struct xlog_op_header); if (ticket->t_curr_res < 0) { xfs_alert_tag(log->l_mp, XFS_PTAG_LOGRES, "ctx ticket reservation ran out. Need to up reservation");
@@ -2387,10 +2379,7 @@ xlog_write( } len = xlog_write_calc_vec_length(ticket, log_vector, need_start_rec); - - index = 0; - lv = log_vector; - vecp = lv->lv_iovecp; + *start_lsn = 0; while (lv && (!lv->lv_niovecs || index < lv->lv_niovecs)) { void *ptr; int log_offset;
--
2.25.1