FSP_SEG_INODES_FULL and FSP_SEG_INODES_FREE

[Gu Lei(Tech)]

in file fsp0fsp.c
 
#define FSP_SEG_INODES_FULL (32 + 3 * FLST_BASE_NODE_SIZE)
     /* list of pages containing segment
     headers, where all the segment inode
     slots are reserved */
#define FSP_SEG_INODES_FREE (32 + 4 * FLST_BASE_NODE_SIZE)
     /* list of pages containing segment
     headers, where not all the segment
     header slots are reserved */
 
What does 'all the segment inode slots are reserved 'mean ? reserved for what ?
 
Thanks.
 
Gu Lei