From 9e733d3923fb0e4eeae7b827019332d246576a22 Mon Sep 17 00:00:00 2001 From: Steven Whitehouse Date: Thu, 23 Aug 2012 15:37:59 +0100 Subject: [PATCH] GFS2: Improve block reservation tracing This patch improves the tracing of block reservations by removing some corner cases and also providing more useful detail in the traces. A new field is added to the reservation structure to contain the inode number. This is used since in certain contexts it is not possible to access the inode itself to obtain this information. As a result we can then display the inode number for all tracepoints and also in case we dump the resource group. The "del" tracepoint operation has been removed. This could be called with the reservation rgrp set to NULL. That resulted in not printing the device number, and thus making the information largely useless anyway. Also, the conditional on the rgrp being NULL can then be removed from the tracepoint. After this change, all the block reservation tracepoint calls will be called with the rgrp information. The existing ins,clm and tdel calls to the block reservation tracepoint are sufficient to track the entire life of the block reservation. In gfs2_block_alloc() the error detection is updated to print out the inode number of the problematic inode. This can then be compared against the information in the glock dump,tracepoints, etc. Signed-off-by: Steven Whitehouse --- fs/gfs2/incore.h | 6 ++---- fs/gfs2/rgrp.c | 22 ++++++++++------------ fs/gfs2/trace_gfs2.h | 18 ++++++++---------- 3 files changed, 20 insertions(+), 26 deletions(-) diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h index 99d7c64b5091..6aaa07c7c731 100644 --- a/fs/gfs2/incore.h +++ b/fs/gfs2/incore.h @@ -268,13 +268,11 @@ struct gfs2_blkreserv { /* components used during write (step 1): */ atomic_t rs_sizehint; /* hint of the write size */ - /* components used during get_local_rgrp (step 3): */ - struct gfs2_rbm rs_rbm; struct gfs2_holder rs_rgd_gh; /* Filled in by get_local_rgrp */ struct rb_node rs_node; /* link to other block reservations */ - - /* components used during block searches and assignments (step 4): */ + struct gfs2_rbm rs_rbm; /* Start of reservation */ u32 rs_free; /* how many blocks are still free */ + u64 rs_inum; /* Inode number for reservation */ /* ancillary quota stuff */ struct gfs2_quota_data *rs_qa_qd[2 * MAXQUOTAS]; diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c index 30c864e70298..87ee0b70f818 100644 --- a/fs/gfs2/rgrp.c +++ b/fs/gfs2/rgrp.c @@ -448,10 +448,11 @@ int gfs2_rs_alloc(struct gfs2_inode *ip) return error; } -static void dump_rs(struct seq_file *seq, struct gfs2_blkreserv *rs) +static void dump_rs(struct seq_file *seq, const struct gfs2_blkreserv *rs) { - gfs2_print_dbg(seq, " r: %llu s:%llu b:%u f:%u\n", - rs->rs_rbm.rgd->rd_addr, gfs2_rbm_to_block(&rs->rs_rbm), + gfs2_print_dbg(seq, " B: n:%llu s:%llu b:%u f:%u\n", + (unsigned long long)rs->rs_inum, + (unsigned long long)gfs2_rbm_to_block(&rs->rs_rbm), rs->rs_rbm.offset, rs->rs_free); } @@ -468,7 +469,7 @@ static void __rs_deltree(struct gfs2_inode *ip, struct gfs2_blkreserv *rs) return; rgd = rs->rs_rbm.rgd; - trace_gfs2_rs(ip, rs, TRACE_RS_TREEDEL); + trace_gfs2_rs(rs, TRACE_RS_TREEDEL); rb_erase(&rs->rs_node, &rgd->rd_rstree); RB_CLEAR_NODE(&rs->rs_node); BUG_ON(!rgd->rd_rs_cnt); @@ -511,7 +512,6 @@ void gfs2_rs_delete(struct gfs2_inode *ip) down_write(&ip->i_rw_mutex); if (ip->i_res) { gfs2_rs_deltree(ip, ip->i_res); - trace_gfs2_rs(ip, ip->i_res, TRACE_RS_DELETE); BUG_ON(ip->i_res->rs_free); kmem_cache_free(gfs2_rsrv_cachep, ip->i_res); ip->i_res = NULL; @@ -1253,6 +1253,7 @@ static struct gfs2_blkreserv *rs_insert(struct gfs2_bitmap *bi, rs->rs_free = amount; rs->rs_rbm.offset = biblk; rs->rs_rbm.bi = bi; + rs->rs_inum = ip->i_no_addr; rb_link_node(&rs->rs_node, parent, newn); rb_insert_color(&rs->rs_node, &rgd->rd_rstree); @@ -1260,7 +1261,7 @@ static struct gfs2_blkreserv *rs_insert(struct gfs2_bitmap *bi, rgd->rd_reserved += amount; /* blocks reserved */ rgd->rd_rs_cnt++; /* number of in-tree reservations */ spin_unlock(&rgd->rd_rsspin); - trace_gfs2_rs(ip, rs, TRACE_RS_INSERT); + trace_gfs2_rs(rs, TRACE_RS_INSERT); return rs; } @@ -1966,7 +1967,7 @@ static void gfs2_adjust_reservation(struct gfs2_inode *ip, rlen = min(rs->rs_free, len); rs->rs_free -= rlen; rgd->rd_reserved -= rlen; - trace_gfs2_rs(ip, rs, TRACE_RS_CLAIM); + trace_gfs2_rs(rs, TRACE_RS_CLAIM); if (rs->rs_free && !ret) goto out; } @@ -2005,10 +2006,6 @@ int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *nblocks, else goal = rbm.rgd->rd_last_alloc + rbm.rgd->rd_data0; - if ((goal < rbm.rgd->rd_data0) || - (goal >= rbm.rgd->rd_data0 + rbm.rgd->rd_data)) - rbm.rgd = gfs2_blk2rgrpd(sdp, goal, 1); - gfs2_rbm_from_block(&rbm, goal); error = gfs2_rbm_find(&rbm, GFS2_BLKST_FREE, ip, false); @@ -2019,7 +2016,8 @@ int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *nblocks, /* Since all blocks are reserved in advance, this shouldn't happen */ if (error) { - fs_warn(sdp, "error=%d, nblocks=%u, full=%d\n", error, *nblocks, + fs_warn(sdp, "inum=%llu error=%d, nblocks=%u, full=%d\n", + (unsigned long long)ip->i_no_addr, error, *nblocks, test_bit(GBF_FULL, &rbm.rgd->rd_bits->bi_flags)); goto rgrp_error; } diff --git a/fs/gfs2/trace_gfs2.h b/fs/gfs2/trace_gfs2.h index b947aa4dfca4..bbdc78af60ca 100644 --- a/fs/gfs2/trace_gfs2.h +++ b/fs/gfs2/trace_gfs2.h @@ -509,10 +509,9 @@ TRACE_EVENT(gfs2_block_alloc, /* Keep track of multi-block reservations as they are allocated/freed */ TRACE_EVENT(gfs2_rs, - TP_PROTO(const struct gfs2_inode *ip, const struct gfs2_blkreserv *rs, - u8 func), + TP_PROTO(const struct gfs2_blkreserv *rs, u8 func), - TP_ARGS(ip, rs, func), + TP_ARGS(rs, func), TP_STRUCT__entry( __field( dev_t, dev ) @@ -526,18 +525,17 @@ TRACE_EVENT(gfs2_rs, ), TP_fast_assign( - __entry->dev = rs->rs_rbm.rgd ? rs->rs_rbm.rgd->rd_sbd->sd_vfs->s_dev : 0; - __entry->rd_addr = rs->rs_rbm.rgd ? rs->rs_rbm.rgd->rd_addr : 0; - __entry->rd_free_clone = rs->rs_rbm.rgd ? rs->rs_rbm.rgd->rd_free_clone : 0; - __entry->rd_reserved = rs->rs_rbm.rgd ? rs->rs_rbm.rgd->rd_reserved : 0; - __entry->inum = ip ? ip->i_no_addr : 0; + __entry->dev = rs->rs_rbm.rgd->rd_sbd->sd_vfs->s_dev; + __entry->rd_addr = rs->rs_rbm.rgd->rd_addr; + __entry->rd_free_clone = rs->rs_rbm.rgd->rd_free_clone; + __entry->rd_reserved = rs->rs_rbm.rgd->rd_reserved; + __entry->inum = rs->rs_inum; __entry->start = gfs2_rbm_to_block(&rs->rs_rbm); __entry->free = rs->rs_free; __entry->func = func; ), - TP_printk("%u,%u bmap %llu resrv %llu rg:%llu rf:%lu rr:%lu %s " - "f:%lu", + TP_printk("%u,%u bmap %llu resrv %llu rg:%llu rf:%lu rr:%lu %s f:%lu", MAJOR(__entry->dev), MINOR(__entry->dev), (unsigned long long)__entry->inum, (unsigned long long)__entry->start, -- GitLab