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authorSteven Whitehouse <swhiteho@redhat.com>2011-08-02 13:09:36 +0100
committerSteven Whitehouse <swhiteho@redhat.com>2011-10-21 12:39:20 +0100
commit75549186edf1515062fe2fcbfbd92bd99659afba (patch)
treec3942739398fdf76b2cfaa3e5f72575f7fa8d4f8 /fs/gfs2
parent2f0264d592e34cde99efbad7d616b04af138e913 (diff)
downloadlinux-75549186edf1515062fe2fcbfbd92bd99659afba.tar.bz2
GFS2: Fix bug-trap in ail flush code
The assert was being tested under the wrong lock, a legacy of the original code. Also, if it does trigger, the resulting information was not always a lot of help. This moves the patch under the correct lock and also prints out more useful information in tacking down the source of the problem. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2')
-rw-r--r--fs/gfs2/glops.c23
1 files changed, 19 insertions, 4 deletions
diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index da21ecaafcc2..99df4832f94c 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -28,6 +28,17 @@
#include "trans.h"
#include "dir.h"
+static void gfs2_ail_error(struct gfs2_glock *gl, const struct buffer_head *bh)
+{
+ fs_err(gl->gl_sbd, "AIL buffer %p: blocknr %llu state 0x%08lx mapping %p page state 0x%lx\n",
+ bh, (unsigned long long)bh->b_blocknr, bh->b_state,
+ bh->b_page->mapping, bh->b_page->flags);
+ fs_err(gl->gl_sbd, "AIL glock %u:%llu mapping %p\n",
+ gl->gl_name.ln_type, gl->gl_name.ln_number,
+ gfs2_glock2aspace(gl));
+ gfs2_lm_withdraw(gl->gl_sbd, "AIL error\n");
+}
+
/**
* __gfs2_ail_flush - remove all buffers for a given lock from the AIL
* @gl: the glock
@@ -41,20 +52,24 @@ static void __gfs2_ail_flush(struct gfs2_glock *gl)
struct list_head *head = &gl->gl_ail_list;
struct gfs2_bufdata *bd;
struct buffer_head *bh;
+ sector_t blocknr;
spin_lock(&sdp->sd_ail_lock);
while (!list_empty(head)) {
bd = list_entry(head->next, struct gfs2_bufdata,
bd_ail_gl_list);
bh = bd->bd_bh;
- gfs2_remove_from_ail(bd);
- bd->bd_bh = NULL;
+ blocknr = bh->b_blocknr;
+ if (buffer_busy(bh))
+ gfs2_ail_error(gl, bh);
bh->b_private = NULL;
+ gfs2_remove_from_ail(bd); /* drops ref on bh */
spin_unlock(&sdp->sd_ail_lock);
- bd->bd_blkno = bh->b_blocknr;
+ bd->bd_bh = NULL;
+ bd->bd_blkno = blocknr;
+
gfs2_log_lock(sdp);
- gfs2_assert_withdraw(sdp, !buffer_busy(bh));
gfs2_trans_add_revoke(sdp, bd);
gfs2_log_unlock(sdp);