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authorAndreas Gruenbacher <agruenba@redhat.com>2018-06-07 11:56:46 +0100
committerBob Peterson <rpeterso@redhat.com>2018-06-21 07:39:44 -0500
commit9e1a9ecd13b9bb421c88135b178577caf4d54f6a (patch)
treebe518fb982b7f8f47c3ed3fa864772d4dd974985 /fs/gfs2/log.c
parentf85c10e24ab9fd8ccb6de3d6061a3110ff3581df (diff)
gfs2: Don't withdraw under a spin lock
In two places, the gfs2_io_error_bh macro is called while holding the sd_ail_lock spin lock. This isn't allowed because gfs2_io_error_bh withdraws the filesystem, which can sleep because it issues a uevent. To fix that, add a gfs2_io_error_bh_wd macro that does withdraw the filesystem and change gfs2_io_error_bh to not withdraw the filesystem. In those places where the new gfs2_io_error_bh is used, withdraw the filesystem after releasing sd_ail_lock. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Signed-off-by: Bob Peterson <rpeterso@redhat.com> Reviewed-by: Andrew Price <anprice@redhat.com>
Diffstat (limited to 'fs/gfs2/log.c')
-rw-r--r--fs/gfs2/log.c26
1 files changed, 19 insertions, 7 deletions
diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c
index 0248835625f1..a767fad02386 100644
--- a/fs/gfs2/log.c
+++ b/fs/gfs2/log.c
@@ -92,7 +92,8 @@ static void gfs2_remove_from_ail(struct gfs2_bufdata *bd)
static int gfs2_ail1_start_one(struct gfs2_sbd *sdp,
struct writeback_control *wbc,
- struct gfs2_trans *tr)
+ struct gfs2_trans *tr,
+ bool *withdraw)
__releases(&sdp->sd_ail_lock)
__acquires(&sdp->sd_ail_lock)
{
@@ -107,8 +108,10 @@ __acquires(&sdp->sd_ail_lock)
gfs2_assert(sdp, bd->bd_tr == tr);
if (!buffer_busy(bh)) {
- if (!buffer_uptodate(bh))
+ if (!buffer_uptodate(bh)) {
gfs2_io_error_bh(sdp, bh);
+ *withdraw = true;
+ }
list_move(&bd->bd_ail_st_list, &tr->tr_ail2_list);
continue;
}
@@ -148,6 +151,7 @@ void gfs2_ail1_flush(struct gfs2_sbd *sdp, struct writeback_control *wbc)
struct list_head *head = &sdp->sd_ail1_list;
struct gfs2_trans *tr;
struct blk_plug plug;
+ bool withdraw = false;
trace_gfs2_ail_flush(sdp, wbc, 1);
blk_start_plug(&plug);
@@ -156,11 +160,13 @@ restart:
list_for_each_entry_reverse(tr, head, tr_list) {
if (wbc->nr_to_write <= 0)
break;
- if (gfs2_ail1_start_one(sdp, wbc, tr))
+ if (gfs2_ail1_start_one(sdp, wbc, tr, &withdraw))
goto restart;
}
spin_unlock(&sdp->sd_ail_lock);
blk_finish_plug(&plug);
+ if (withdraw)
+ gfs2_lm_withdraw(sdp, NULL);
trace_gfs2_ail_flush(sdp, wbc, 0);
}
@@ -188,7 +194,8 @@ static void gfs2_ail1_start(struct gfs2_sbd *sdp)
*
*/
-static void gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
+static void gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_trans *tr,
+ bool *withdraw)
{
struct gfs2_bufdata *bd, *s;
struct buffer_head *bh;
@@ -199,11 +206,12 @@ static void gfs2_ail1_empty_one(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
gfs2_assert(sdp, bd->bd_tr == tr);
if (buffer_busy(bh))
continue;
- if (!buffer_uptodate(bh))
+ if (!buffer_uptodate(bh)) {
gfs2_io_error_bh(sdp, bh);
+ *withdraw = true;
+ }
list_move(&bd->bd_ail_st_list, &tr->tr_ail2_list);
}
-
}
/**
@@ -218,10 +226,11 @@ static int gfs2_ail1_empty(struct gfs2_sbd *sdp)
struct gfs2_trans *tr, *s;
int oldest_tr = 1;
int ret;
+ bool withdraw = false;
spin_lock(&sdp->sd_ail_lock);
list_for_each_entry_safe_reverse(tr, s, &sdp->sd_ail1_list, tr_list) {
- gfs2_ail1_empty_one(sdp, tr);
+ gfs2_ail1_empty_one(sdp, tr, &withdraw);
if (list_empty(&tr->tr_ail1_list) && oldest_tr)
list_move(&tr->tr_list, &sdp->sd_ail2_list);
else
@@ -230,6 +239,9 @@ static int gfs2_ail1_empty(struct gfs2_sbd *sdp)
ret = list_empty(&sdp->sd_ail1_list);
spin_unlock(&sdp->sd_ail_lock);
+ if (withdraw)
+ gfs2_lm_withdraw(sdp, "fatal: I/O error(s)\n");
+
return ret;
}