From f9bccfcc3b59b9aba64791ab3a2bfefe681ab75b Mon Sep 17 00:00:00 2001 From: Brian Foster Date: Wed, 6 May 2020 13:25:21 -0700 Subject: [PATCH] xfs: refactor ratelimited buffer error messages into helper XFS has some inconsistent log message rate limiting with respect to buffer alerts. The metadata I/O error notification uses the generic ratelimited alert, the buffer push code uses a custom rate limit and the similar quiesce time failure checks are not rate limited at all (when they should be). The custom rate limit defined in the buf item code is specifically crafted for buffer alerts. It is more aggressive than generic rate limiting code because it must accommodate a high frequency of I/O error events in a relative short timeframe. Factor out the custom rate limit state from the buf item code into a per-buftarg rate limit so various alerts are limited based on the target. Define a buffer alert helper function and use it for the buffer alerts that are already ratelimited. Signed-off-by: Brian Foster Reviewed-by: Darrick J. Wong Reviewed-by: Christoph Hellwig Reviewed-by: Allison Collins Signed-off-by: Darrick J. Wong --- fs/xfs/xfs_buf.c | 15 +++++++++++---- fs/xfs/xfs_buf.h | 1 + fs/xfs/xfs_buf_item.c | 17 ++++------------- fs/xfs/xfs_message.c | 22 ++++++++++++++++++++++ fs/xfs/xfs_message.h | 3 +++ 5 files changed, 41 insertions(+), 17 deletions(-) diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c index fd76a84cefdd..594d5e1df6f8 100644 --- a/fs/xfs/xfs_buf.c +++ b/fs/xfs/xfs_buf.c @@ -1244,10 +1244,10 @@ xfs_buf_ioerror_alert( struct xfs_buf *bp, xfs_failaddr_t func) { - xfs_alert_ratelimited(bp->b_mount, -"metadata I/O error in \"%pS\" at daddr 0x%llx len %d error %d", - func, (uint64_t)XFS_BUF_ADDR(bp), bp->b_length, - -bp->b_error); + xfs_buf_alert_ratelimited(bp, "XFS: metadata IO error", + "metadata I/O error in \"%pS\" at daddr 0x%llx len %d error %d", + func, (uint64_t)XFS_BUF_ADDR(bp), + bp->b_length, -bp->b_error); } /* @@ -1828,6 +1828,13 @@ xfs_alloc_buftarg( btp->bt_bdev = bdev; btp->bt_daxdev = dax_dev; + /* + * Buffer IO error rate limiting. Limit it to no more than 10 messages + * per 30 seconds so as to not spam logs too much on repeated errors. + */ + ratelimit_state_init(&btp->bt_ioerror_rl, 30 * HZ, + DEFAULT_RATELIMIT_BURST); + if (xfs_setsize_buftarg_early(btp, bdev)) goto error_free; diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h index 06ea3eef866e..050c53b739e2 100644 --- a/fs/xfs/xfs_buf.h +++ b/fs/xfs/xfs_buf.h @@ -91,6 +91,7 @@ typedef struct xfs_buftarg { struct list_lru bt_lru; struct percpu_counter bt_io_count; + struct ratelimit_state bt_ioerror_rl; } xfs_buftarg_t; struct xfs_buf; diff --git a/fs/xfs/xfs_buf_item.c b/fs/xfs/xfs_buf_item.c index b452a399a441..1f7acffc99ba 100644 --- a/fs/xfs/xfs_buf_item.c +++ b/fs/xfs/xfs_buf_item.c @@ -481,14 +481,6 @@ xfs_buf_item_unpin( } } -/* - * Buffer IO error rate limiting. Limit it to no more than 10 messages per 30 - * seconds so as to not spam logs too much on repeated detection of the same - * buffer being bad.. - */ - -static DEFINE_RATELIMIT_STATE(xfs_buf_write_fail_rl_state, 30 * HZ, 10); - STATIC uint xfs_buf_item_push( struct xfs_log_item *lip, @@ -518,11 +510,10 @@ xfs_buf_item_push( trace_xfs_buf_item_push(bip); /* has a previous flush failed due to IO errors? */ - if ((bp->b_flags & XBF_WRITE_FAIL) && - ___ratelimit(&xfs_buf_write_fail_rl_state, "XFS: Failing async write")) { - xfs_warn(bp->b_mount, -"Failing async write on buffer block 0x%llx. Retrying async write.", - (long long)bp->b_bn); + if (bp->b_flags & XBF_WRITE_FAIL) { + xfs_buf_alert_ratelimited(bp, "XFS: Failing async write", + "Failing async write on buffer block 0x%llx. Retrying async write.", + (long long)bp->b_bn); } if (!xfs_buf_delwri_queue(bp, buffer_list)) diff --git a/fs/xfs/xfs_message.c b/fs/xfs/xfs_message.c index e0f9d3b6abe9..bc66d95c8d4c 100644 --- a/fs/xfs/xfs_message.c +++ b/fs/xfs/xfs_message.c @@ -117,3 +117,25 @@ xfs_hex_dump(const void *p, int length) { print_hex_dump(KERN_ALERT, "", DUMP_PREFIX_OFFSET, 16, 1, p, length, 1); } + +void +xfs_buf_alert_ratelimited( + struct xfs_buf *bp, + const char *rlmsg, + const char *fmt, + ...) +{ + struct xfs_mount *mp = bp->b_mount; + struct va_format vaf; + va_list args; + + /* use the more aggressive per-target rate limit for buffers */ + if (!___ratelimit(&bp->b_target->bt_ioerror_rl, rlmsg)) + return; + + va_start(args, fmt); + vaf.fmt = fmt; + vaf.va = &args; + __xfs_printk(KERN_ALERT, mp, &vaf); + va_end(args); +} diff --git a/fs/xfs/xfs_message.h b/fs/xfs/xfs_message.h index 802a96190d22..4d9bd6bb63ca 100644 --- a/fs/xfs/xfs_message.h +++ b/fs/xfs/xfs_message.h @@ -79,4 +79,7 @@ void asswarn(struct xfs_mount *mp, char *expr, char *f, int l); extern void xfs_hex_dump(const void *p, int length); +void xfs_buf_alert_ratelimited(struct xfs_buf *bp, const char *rlmsg, + const char *fmt, ...); + #endif /* __XFS_MESSAGE_H */ -- 2.39.5