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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>
This commit is contained in:
Andreas Gruenbacher 2018-06-07 11:56:46 +01:00 committed by Bob Peterson
parent f85c10e24a
commit 9e1a9ecd13
5 changed files with 49 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
fs/gfs2/log.c
View File

@ -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;
}

2
fs/gfs2/lops.c
View File

@ -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.

4
fs/gfs2/meta_io.c
View File

@ -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)))

38
fs/gfs2/util.c
View File

@ -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);
}

10
fs/gfs2/util.h
View File

@ -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;