diff options
Diffstat (limited to 'module/zfs/zfs_vfsops.c')
| -rw-r--r-- | module/zfs/zfs_vfsops.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/module/zfs/zfs_vfsops.c b/module/zfs/zfs_vfsops.c index 3c9a8476c..2f1f44207 100644 --- a/module/zfs/zfs_vfsops.c +++ b/module/zfs/zfs_vfsops.c @@ -1415,6 +1415,24 @@ zfs_preumount(struct super_block *sb) if (zsb) zfsctl_destroy(sb->s_fs_info); + /* + * Wait for iput_async before entering evict_inodes in + * generic_shutdown_super. The reason we must finish before + * evict_inodes is when lazytime is on, or when zfs_purgedir calls + * zfs_zget, iput would bump i_count from 0 to 1. This would race + * with the i_count check in evict_inodes. This means it could + * destroy the inode while we are still using it. + * + * We wait for two passes. xattr directories in the first pass may + * add xattr entries in zfs_purgedir, so in the second pass we wait + * for them. We don't use taskq_wait here because it is a pool wide + * taskq. Other mounted filesystems can constantly do iput_async + * and there's no guarantee when taskq will be empty. + */ + taskq_wait_outstanding(dsl_pool_iput_taskq( + dmu_objset_pool(zsb->z_os)), 0); + taskq_wait_outstanding(dsl_pool_iput_taskq( + dmu_objset_pool(zsb->z_os)), 0); } EXPORT_SYMBOL(zfs_preumount); |