diff options
| -rw-r--r-- | fs/gfs2/super.c | 53 |
1 files changed, 47 insertions, 6 deletions
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c index 7d8caf169efd..bcb56f13f50a 100644 --- a/fs/gfs2/super.c +++ b/fs/gfs2/super.c @@ -1258,6 +1258,50 @@ static void gfs2_glock_put_eventually(struct gfs2_glock *gl) gfs2_glock_put(gl); } +static bool gfs2_upgrade_iopen_glock(struct inode *inode) +{ + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_sbd *sdp = GFS2_SB(inode); + struct gfs2_holder *gh = &ip->i_iopen_gh; + long timeout = 5 * HZ; + int error; + + gh->gh_flags |= GL_NOCACHE; + gfs2_glock_dq_wait(gh); + + /* + * If there are no other lock holders, we'll get the lock immediately. + * Otherwise, the other nodes holding the lock will be notified about + * our locking request. If they don't have the inode open, they'll + * evict the cached inode and release the lock. As a last resort, + * we'll eventually time out. + * + * Note that we're passing the LM_FLAG_TRY_1CB flag to the first + * locking request as an optimization to notify lock holders as soon as + * possible. Without that flag, they'd be notified implicitly by the + * second locking request. + */ + + gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, gh); + error = gfs2_glock_nq(gh); + if (error != GLR_TRYFAILED) + return !error; + + gfs2_holder_reinit(LM_ST_EXCLUSIVE, GL_ASYNC | GL_NOCACHE, gh); + error = gfs2_glock_nq(gh); + if (error) + return false; + + timeout = wait_event_interruptible_timeout(sdp->sd_async_glock_wait, + !test_bit(HIF_WAIT, &gh->gh_iflags), + timeout); + if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) { + gfs2_glock_dq(gh); + return false; + } + return true; +} + /** * gfs2_evict_inode - Remove an inode from cache * @inode: The inode to evict @@ -1339,13 +1383,10 @@ static void gfs2_evict_inode(struct inode *inode) out_delete: if (gfs2_holder_initialized(&ip->i_iopen_gh) && test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) { - ip->i_iopen_gh.gh_flags |= GL_NOCACHE; - gfs2_glock_dq_wait(&ip->i_iopen_gh); - gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, - &ip->i_iopen_gh); - error = gfs2_glock_nq(&ip->i_iopen_gh); - if (error) + if (!gfs2_upgrade_iopen_glock(inode)) { + gfs2_holder_uninit(&ip->i_iopen_gh); goto out_truncate; + } } if (S_ISDIR(inode->i_mode) && |