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 <agrue...@redhat.com>
Signed-off-by: Bob Peterson <rpete...@redhat.com>
Reviewed-by: Andrew Price <anpr...@redhat.com>
---
fs/gfs2/log.c | 26 +++++++++++++++++++-------
fs/gfs2/lops.c | 2 +-
fs/gfs2/meta_io.c | 4 ++--
fs/gfs2/util.c | 38 ++++++++++++++++++++------------------
fs/gfs2/util.h | 10 +++++++---
5 files changed, 49 insertions(+), 31 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 @@ void gfs2_ail1_flush(struct gfs2_sbd *sdp, struct
writeback_control *wbc)
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;
}
diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
index 4d6567990baf..f2567f958d00 100644
--- a/fs/gfs2/lops.c
+++ b/fs/gfs2/lops.c
@@ -49,7 +49,7 @@ void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh)
if (test_set_buffer_pinned(bh))
gfs2_assert_withdraw(sdp, 0);
if (!buffer_uptodate(bh))
- gfs2_io_error_bh(sdp, bh);
+ gfs2_io_error_bh_wd(sdp, bh);
bd = bh->b_private;
/* If this buffer is in the AIL and it has already been written
* to in-place disk block, remove it from the AIL.
diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index 52de1036d9f9..be9c0bf697fe 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -293,7 +293,7 @@ int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int
flags,
if (unlikely(!buffer_uptodate(bh))) {
struct gfs2_trans *tr = current->journal_info;
if (tr && test_bit(TR_TOUCHED, &tr->tr_flags))
- gfs2_io_error_bh(sdp, bh);
+ gfs2_io_error_bh_wd(sdp, bh);
brelse(bh);
*bhp = NULL;
return -EIO;
@@ -320,7 +320,7 @@ int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head
*bh)
if (!buffer_uptodate(bh)) {
struct gfs2_trans *tr = current->journal_info;
if (tr && test_bit(TR_TOUCHED, &tr->tr_flags))
- gfs2_io_error_bh(sdp, bh);
+ gfs2_io_error_bh_wd(sdp, bh);
return -EIO;
}
if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
diff --git a/fs/gfs2/util.c b/fs/gfs2/util.c
index 763d659db91b..59c811de0dc7 100644
--- a/fs/gfs2/util.c
+++ b/fs/gfs2/util.c
@@ -46,14 +46,16 @@ int gfs2_lm_withdraw(struct gfs2_sbd *sdp, const char *fmt,
...)
test_and_set_bit(SDF_SHUTDOWN, &sdp->sd_flags))
return 0;
- va_start(args, fmt);
+ if (fmt) {
+ va_start(args, fmt);
- vaf.fmt = fmt;
- vaf.va = &args;
+ vaf.fmt = fmt;
+ vaf.va = &args;
- fs_err(sdp, "%pV", &vaf);
+ fs_err(sdp, "%pV", &vaf);
- va_end(args);
+ va_end(args);
+ }
if (sdp->sd_args.ar_errors == GFS2_ERRORS_WITHDRAW) {
fs_err(sdp, "about to withdraw this file system\n");
@@ -246,21 +248,21 @@ int gfs2_io_error_i(struct gfs2_sbd *sdp, const char
*function, char *file,
}
/**
- * gfs2_io_error_bh_i - Flag a buffer I/O error and withdraw
- * Returns: -1 if this call withdrew the machine,
- * 0 if it was already withdrawn
+ * gfs2_io_error_bh_i - Flag a buffer I/O error
+ * @withdraw: withdraw the filesystem
*/
-int gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
- const char *function, char *file, unsigned int line)
+void gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
+ const char *function, char *file, unsigned int line,
+ bool withdraw)
{
- int rv;
- rv = gfs2_lm_withdraw(sdp,
- "fatal: I/O error\n"
- " block = %llu\n"
- " function = %s, file = %s, line = %u\n",
- (unsigned long long)bh->b_blocknr,
- function, file, line);
- return rv;
+ fs_err(sdp,
+ "fatal: I/O error\n"
+ " block = %llu\n"
+ " function = %s, file = %s, line = %u\n",
+ (unsigned long long)bh->b_blocknr,
+ function, file, line);
+ if (withdraw)
+ gfs2_lm_withdraw(sdp, NULL);
}
diff --git a/fs/gfs2/util.h b/fs/gfs2/util.h
index 3926f95a6eb7..96ac4aba4738 100644
--- a/fs/gfs2/util.h
+++ b/fs/gfs2/util.h
@@ -136,11 +136,15 @@ int gfs2_io_error_i(struct gfs2_sbd *sdp, const char
*function,
gfs2_io_error_i((sdp), __func__, __FILE__, __LINE__);
-int gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
- const char *function, char *file, unsigned int line);
+void gfs2_io_error_bh_i(struct gfs2_sbd *sdp, struct buffer_head *bh,
+ const char *function, char *file, unsigned int line,
+ bool withdraw);
+
+#define gfs2_io_error_bh_wd(sdp, bh) \
+gfs2_io_error_bh_i((sdp), (bh), __func__, __FILE__, __LINE__, true);
#define gfs2_io_error_bh(sdp, bh) \
-gfs2_io_error_bh_i((sdp), (bh), __func__, __FILE__, __LINE__);
+gfs2_io_error_bh_i((sdp), (bh), __func__, __FILE__, __LINE__, false);
extern struct kmem_cache *gfs2_glock_cachep;
--
2.17.1
