From 30fe70a85a909a23dcbc2c628ca6655b2c85e7a1 Mon Sep 17 00:00:00 2001 From: Bob Peterson Date: Wed, 13 Nov 2019 11:47:09 -0600 Subject: gfs2: clear ail1 list when gfs2 withdraws This patch fixes a bug in which function gfs2_log_flush can get into an infinite loop when a gfs2 file system is withdrawn. The problem is the infinite loop "for (;;)" in gfs2_log_flush which would never finish because the io error and subsequent withdraw prevented the items from being taken off the ail list. This patch tries to clean up the mess by allowing withdraw situations to move not-in-flight buffer_heads to the ail2 list, where they will be dealt with later. Signed-off-by: Bob Peterson Reviewed-by: Andreas Gruenbacher --- fs/gfs2/log.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) (limited to 'fs/gfs2/log.c') diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c index d1ab04135b2f..9ebec6f93fa3 100644 --- a/fs/gfs2/log.c +++ b/fs/gfs2/log.c @@ -103,16 +103,22 @@ __acquires(&sdp->sd_ail_lock) gfs2_assert(sdp, bd->bd_tr == tr); if (!buffer_busy(bh)) { - if (!buffer_uptodate(bh) && - !test_and_set_bit(SDF_AIL1_IO_ERROR, + if (buffer_uptodate(bh)) { + list_move(&bd->bd_ail_st_list, + &tr->tr_ail2_list); + continue; + } + if (!test_and_set_bit(SDF_AIL1_IO_ERROR, &sdp->sd_flags)) { gfs2_io_error_bh(sdp, bh); gfs2_withdraw_delayed(sdp); } - list_move(&bd->bd_ail_st_list, &tr->tr_ail2_list); - continue; } + if (gfs2_withdrawn(sdp)) { + gfs2_remove_from_ail(bd); + continue; + } if (!buffer_dirty(bh)) continue; if (gl == bd->bd_gl) @@ -859,6 +865,8 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, u32 flags) if (gfs2_ail1_empty(sdp)) break; } + if (gfs2_withdrawn(sdp)) + goto out; atomic_dec(&sdp->sd_log_blks_free); /* Adjust for unreserved buffer */ trace_gfs2_log_blocks(sdp, -1); log_write_header(sdp, flags); @@ -871,6 +879,7 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl, u32 flags) atomic_set(&sdp->sd_freeze_state, SFS_FROZEN); } +out: trace_gfs2_log_flush(sdp, 0, flags); up_write(&sdp->sd_log_flush_lock); -- cgit v1.2.3