TL;DR：我不明白为什么我可以访问一个文件但不能访问另一个文件（在同一个目录中），尽管它们似乎具有相同的权限。
我有一个运行 Solaris 10 10/08 的 NFS 服务器和一个运行 Ubuntu 12.04 的客户端。我像这样挂载 ZFS 快照：
# mount | grep homes
server:/homes/.zfs/snapshot on /u/homes type nfs (ro,noatime,vers=3,intr,sloppy,addr=1.2.3.4)
然后我查看这两个文件/u/homes：
# ls -l 1.txt 2.txt
-rw-r--r--+ 1 usr grp 2.2K Oct 12 13:42 1.txt
-rw-r--r--+ 1 usr grp 2.1K May 31 2013 2.txt
# stat 1.txt
File: `1.txt'
Size: 2170 Blocks: 4 IO Block: 1048576 regular file
Device: 43h/67d Inode: 1621536 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 2428/ usr) Gid: ( 2000/ grp)
Birth: -
# stat 2.txt
File: `2.txt'
Size: 2146 Blocks: 3 IO Block: 1048576 regular file
Device: 43h/67d Inode: 7975730 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 2428/ usr) Gid: ( 2000/ grp)
Birth: -
在服务器上查看相同的文件：
File: `1.txt'
Size: 2170 Blocks: 4 IO Block: 2560 regular file
Device: 2d50005h/47513605d Inode: 1621536 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 2428/ UNKNOWN) Gid: ( 2000/ UNKNOWN)
File: `2.txt'
Size: 2146 Blocks: 3 IO Block: 2560 regular file
Device: 2d50005h/47513605d Inode: 7975730 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 2428/ UNKNOWN) Gid: ( 2000/ UNKNOWN)
它们在我看来非常相似。现在，当我尝试从客户端访问它们时，我得到了
# cat 2.txt >/dev/null; echo $?
0
# cat 1.txt >/dev/null; echo $?
cat: 1.txt: Permission denied
1
怎么回事？它们具有相同的权限！我还在snoop服务器端对 NFS 数据包进行了 -ed 处理，通信没有任何差异（数据包长度、校验和、时间戳等除外），但一个文件返回
NFS: Access = read
和另一个
NFS: Access =
怎么会这样？我做错了什么？
编辑1
# zfs get all homes | sort
NAME PROPERTY VALUE SOURCE
homes aclinherit restricted default
homes aclmode groupmask default
homes atime on default
homes available 1.36T -
homes canmount on default
homes casesensitivity sensitive -
homes checksum on default
homes compression on inherited from homes
homes compressratio 1.57x -
homes copies 1 default
homes creation Mon Aug 17 18:53 2015 -
homes devices on default
homes exec on default
homes logbias latency default
homes mounted yes -
homes mountpoint /homes local
homes nbmand off default
homes normalization none -
homes primarycache all default
homes quota none default
homes readonly off inherited from homes
homes recordsize 128K default
homes referenced 800G -
homes refquota none default
homes refreservation none default
homes reservation none default
homes secondarycache all default
homes setuid on default
homes shareiscsi off default
homes sharenfs on inherited from homes
homes sharesmb off default
homes snapdir hidden default
homes type filesystem -
homes used 1.31T -
homes usedbychildren 0 -
homes usedbydataset 800G -
homes usedbyrefreservation 0 -
homes usedbysnapshots 544G -
homes utf8only off -
homes version 4 -
homes vscan off default
homes xattr on default
homes zoned off default
# zfs get all homes@backup_2016-01-21 | sort
NAME PROPERTY VALUE SOURCE
homes@backup_2016-01-21 casesensitivity sensitive -
homes@backup_2016-01-21 compressratio 1.53x -
homes@backup_2016-01-21 creation Thu Jan 21 0:00 2016 -
homes@backup_2016-01-21 defer_destroy off -
homes@backup_2016-01-21 devices on default
homes@backup_2016-01-21 exec on default
homes@backup_2016-01-21 nbmand off default
homes@backup_2016-01-21 normalization none -
homes@backup_2016-01-21 primarycache all default
homes@backup_2016-01-21 referenced 800G -
homes@backup_2016-01-21 secondarycache all default
homes@backup_2016-01-21 setuid on default
homes@backup_2016-01-21 shareiscsi off default
homes@backup_2016-01-21 type snapshot -
homes@backup_2016-01-21 used 0 -
homes@backup_2016-01-21 userrefs 0 -
homes@backup_2016-01-21 utf8only off -
homes@backup_2016-01-21 version 4 -
homes@backup_2016-01-21 xattr on default
编辑2
# share
- /homes rw ""