diff options
Diffstat (limited to 'include/sys/zfs_ioctl.h')
| -rw-r--r-- | include/sys/zfs_ioctl.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/include/sys/zfs_ioctl.h b/include/sys/zfs_ioctl.h index 0ab095c1a..c7bd789e8 100644 --- a/include/sys/zfs_ioctl.h +++ b/include/sys/zfs_ioctl.h @@ -371,8 +371,15 @@ enum zfsdev_state_type { ZST_ALL, }; +/* + * The zfsdev_state_t structure is managed as a singly-linked list + * from which items are never deleted. This allows for lock-free + * reading of the list so long as assignments to the zs_next and + * reads from zs_minor are performed atomically. Empty items are + * indicated by storing -1 into zs_minor. + */ typedef struct zfsdev_state { - list_node_t zs_next; /* next zfsdev_state_t link */ + struct zfsdev_state *zs_next; /* next zfsdev_state_t link */ struct file *zs_file; /* associated file struct */ minor_t zs_minor; /* made up minor number */ void *zs_onexit; /* onexit data */ |