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gfs2: Dequeue waiters when withdrawn

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When a withdraw occurs, ordinary (not system) glocks may not be granted
anymore. Later, when the file system is unmounted, gfs2_gl_hash_clear()
tries to clear out all the glocks, but these un-grantable pending
waiters prevent some glocks from being freed. So the unmount hangs, at
least for its ten-minute timeout period.

This patch takes measures to remove any pending waiters from
the glocks that will never be granted. This allows the unmount to
proceed in a reasonable period of time.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Bob Peterson 2022-08-18 13:32:37 -05:00 committed by Andreas Gruenbacher
parent 04133b607a
commit 053640a738
3 changed files with 20 additions and 0 deletions
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14
fs/gfs2/glock.c
View File

@ -2196,6 +2196,20 @@ static void dump_glock_func(struct gfs2_glock *gl)
dump_glock(NULL, gl, true);
}
static void withdraw_dq(struct gfs2_glock *gl)
{
spin_lock(&gl->gl_lockref.lock);
if (!__lockref_is_dead(&gl->gl_lockref) &&
glock_blocked_by_withdraw(gl))
do_error(gl, LM_OUT_ERROR); /* remove pending waiters */
spin_unlock(&gl->gl_lockref.lock);
}
void gfs2_gl_dq_holders(struct gfs2_sbd *sdp)
{
glock_hash_walk(withdraw_dq, sdp);
}
/**
* gfs2_gl_hash_clear - Empty out the glock hash table
* @sdp: the filesystem

1
fs/gfs2/glock.h
View File

@ -274,6 +274,7 @@ extern void gfs2_cancel_delete_work(struct gfs2_glock *gl);
extern bool gfs2_delete_work_queued(const struct gfs2_glock *gl);
extern void gfs2_flush_delete_work(struct gfs2_sbd *sdp);
extern void gfs2_gl_hash_clear(struct gfs2_sbd *sdp);
extern void gfs2_gl_dq_holders(struct gfs2_sbd *sdp);
extern void gfs2_glock_thaw(struct gfs2_sbd *sdp);
extern void gfs2_glock_add_to_lru(struct gfs2_glock *gl);
extern void gfs2_glock_free(struct gfs2_glock *gl);

5
fs/gfs2/util.c
View File

@ -164,6 +164,11 @@ static void signal_our_withdraw(struct gfs2_sbd *sdp)
}
if (!ret)
gfs2_make_fs_ro(sdp);
/*
* Dequeue any pending non-system glock holders that can no
* longer be granted because the file system is withdrawn.
*/
gfs2_gl_dq_holders(sdp);
gfs2_freeze_unlock(&freeze_gh);
}