diff options
| -rw-r--r-- | fs/gfs2/super.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c index 4089dbe617a6..a83fe8260d2e 100644 --- a/fs/gfs2/super.c +++ b/fs/gfs2/super.c @@ -1318,6 +1318,23 @@ static int gfs2_drop_inode(struct inode *inode) if (test_bit(GLF_DEMOTE, &gl->gl_flags)) clear_nlink(inode); } + + /* + * When under memory pressure when an inode's link count has dropped to + * zero, defer deleting the inode to the delete workqueue. This avoids + * calling into DLM under memory pressure, which can deadlock. + */ + if (!inode->i_nlink && + unlikely(current->flags & PF_MEMALLOC) && + gfs2_holder_initialized(&ip->i_iopen_gh)) { + struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; + + gfs2_glock_hold(gl); + if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0) + gfs2_glock_queue_put(gl); + return false; + } + return generic_drop_inode(inode); } @@ -1561,6 +1578,10 @@ static void gfs2_evict_inode(struct inode *inode) goto alloc_failed; } + /* Deletes should never happen under memory pressure anymore. */ + if (WARN_ON_ONCE(current->flags & PF_MEMALLOC)) + goto out; + /* Must not read inode block until block type has been verified */ error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh); if (unlikely(error)) { |