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Chuck Lever e984a55a74 NFS: Use the same nfs_client_id4 for every server 
Currently, when identifying itself to NFS servers, the Linux NFS
client uses a unique nfs_client_id4.id string for each server IP
address it talks with.  For example, when client A talks to server X,
the client identifies itself using a string like "AX".  The
requirements for these strings are specified in detail by RFC 3530
(and bis).

This form of client identification presents a problem for Transparent
State Migration.  When client A's state on server X is migrated to
server Y, it continues to be associated with string "AX."  But,
according to the rules of client string construction above, client
A will present string "AY" when communicating with server Y.

Server Y thus has no way to know that client A should be associated
with the state migrated from server X.  "AX" is all but abandoned,
interfering with establishing fresh state for client A on server Y.

To support transparent state migration, then, NFSv4.0 clients must
instead use the same nfs_client_id4.id string to identify themselves
to every NFS server; something like "A".

Now a client identifies itself as "A" to server X.  When a file
system on server X transitions to server Y, and client A identifies
itself as "A" to server Y, Y will know immediately that the state
associated with "A," whether it is native or migrated, is owned by
the client, and can merge both into a single lease.

As a pre-requisite to adding support for NFSv4 migration to the Linux
NFS client, this patch changes the way Linux identifies itself to NFS
servers via the SETCLIENTID (NFSv4 minor version 0) and EXCHANGE_ID
(NFSv4 minor version 1) operations.

In addition to removing the server's IP address from nfs_client_id4,
the Linux NFS client will also no longer use its own source IP address
as part of the nfs_client_id4 string.  On multi-homed clients, the
value of this address depends on the address family and network
routing used to contact the server, thus it can be different for each
server.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
 		2012-10-01 15:33:33 -07:00
..
9p 9p: Push file_update_time() into v9fs_vm_page_mkwrite() 2012-07-31 01:02:46 +04:00
adfs stop passing nameidata to ->lookup() 2012-07-14 16:34:32 +04:00
affs affs: use memweight() 2012-07-30 17:25:16 -07:00
afs VFS: Pass mount flags to sget() 2012-07-14 16:38:34 +04:00
autofs4 autofs4 - fix expire check 2012-08-17 06:56:39 -07:00
befs stop passing nameidata to ->lookup() 2012-07-14 16:34:32 +04:00
bfs don't pass nameidata to ->create() 2012-07-14 16:34:47 +04:00
btrfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs 2012-09-16 12:58:44 -07:00
cachefiles fs: cachefiles: add support for large files in filesystem caching 2012-07-30 17:25:21 -07:00
ceph ceph: avoid divide by zero in __validate_layout() 2012-08-21 15:55:28 -07:00
cifs CIFS: Fix endianness conversion 2012-09-06 12:42:35 -05:00
coda don't pass nameidata to ->create() 2012-07-14 16:34:47 +04:00
configfs stop passing nameidata to ->lookup() 2012-07-14 16:34:32 +04:00
cramfs stop passing nameidata to ->lookup() 2012-07-14 16:34:32 +04:00
debugfs Driver core merge for 3.6-rc1 2012-07-26 11:25:33 -07:00
devpts VFS: Pass mount flags to sget() 2012-07-14 16:38:34 +04:00
dlm dlm: fix missing dir remove 2012-07-16 14:24:43 -05:00
ecryptfs eCryptfs: Copy up attributes of the lower target inode after rename 2012-09-14 09:36:03 -07:00
efs stop passing nameidata to ->lookup() 2012-07-14 16:34:32 +04:00
exofs Merge branch 'for-linus' of git://git.open-osd.org/linux-open-osd 2012-08-03 13:24:07 -07:00
exportfs switch dentry_open() to struct path, make it grab references itself 2012-07-23 00:01:29 +04:00
ext2 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-08-01 10:26:23 -07:00
ext3 ext3: Fix fdatasync() for files with only i_size changes 2012-09-04 00:04:43 +02:00
ext4 The following are all bug fixes and regressions. The most notable are 2012-08-17 08:04:47 -07:00
fat Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-08-01 10:26:23 -07:00
freevxfs stop passing nameidata to ->lookup() 2012-07-14 16:34:32 +04:00
fscache
…
fuse fuse: fix retrieve length 2012-09-04 18:45:54 +02:00
gfs2 Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-3.0-fixes 2012-09-14 18:05:14 -07:00
hfs hfs: nuke write_super from comments 2012-08-04 12:15:38 +04:00
hfsplus hfsplus: use -ENOMEM when kzalloc() fails 2012-07-30 17:25:19 -07:00
hostfs don't pass nameidata to ->create() 2012-07-14 16:34:47 +04:00
hpfs don't pass nameidata to ->create() 2012-07-14 16:34:47 +04:00
hppfs switch dentry_open() to struct path, make it grab references itself 2012-07-23 00:01:29 +04:00
hugetlbfs hugetlb: use mmu_gather instead of a temporary linked list for accumulating pages 2012-07-31 18:42:40 -07:00
isofs Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs 2012-07-24 17:40:44 -07:00
jbd jbd: don't write superblock when unmounting an ro filesystem 2012-08-15 13:53:30 +02:00
jbd2 The following are all bug fixes and regressions. The most notable are 2012-08-17 08:04:47 -07:00
jffs2 don't expose I_NEW inodes via dentry->d_inode 2012-07-23 00:00:58 +04:00
jfs don't expose I_NEW inodes via dentry->d_inode 2012-07-23 00:00:58 +04:00
lockd lockd: create and use per-net NSM RPC clients on MON/UNMON requests 2012-10-01 15:27:43 -07:00
logfs Pull request from git://github.com/prasad-joshi/logfs_upstream.git 2012-08-26 10:14:11 -07:00
minix minixfs: fix block limit check 2012-07-30 17:25:19 -07:00
ncpfs don't pass nameidata to ->create() 2012-07-14 16:34:47 +04:00
nfs NFS: Use the same nfs_client_id4 for every server 2012-10-01 15:33:33 -07:00
nfs_common
…
nfsd nfsd4: fix security flavor of NFSv4.0 callback 2012-08-20 18:38:36 -04:00
nilfs2 nilfs2: nuke write_super from comments 2012-08-04 12:15:38 +04:00
nls nls: fix (and rename) mac NLS table files and config options 2012-06-01 19:51:22 -07:00
notify switch dentry_open() to struct path, make it grab references itself 2012-07-23 00:01:29 +04:00
ntfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-08-01 10:26:23 -07:00
ocfs2 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-08-01 10:26:23 -07:00
omfs don't pass nameidata to ->create() 2012-07-14 16:34:47 +04:00
openpromfs stop passing nameidata to ->lookup() 2012-07-14 16:34:32 +04:00
proc fs/proc: fix potential unregister_sysctl_table hang 2012-09-17 10:32:03 -07:00
pstore pstore/ram: Make tracing log versioned 2012-07-17 16:48:09 -07:00
qnx4 qnx4fs: use memweight() 2012-07-30 17:25:16 -07:00
qnx6 stop passing nameidata to ->lookup() 2012-07-14 16:34:32 +04:00
quota quota: Move down dqptr_sem read after initializing default warn[] type at __dquot_alloc_space(). 2012-08-15 00:22:57 +02:00
ramfs don't pass nameidata to ->create() 2012-07-14 16:34:47 +04:00
reiserfs reiserfs: fix deadlocks with quotas 2012-08-15 00:22:57 +02:00
romfs stop passing nameidata to ->lookup() 2012-07-14 16:34:32 +04:00
squashfs stop passing nameidata to ->lookup() 2012-07-14 16:34:32 +04:00
sysfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-08-01 10:26:23 -07:00
sysv fs/sysv: stop using write_super and s_dirt 2012-07-22 23:58:12 +04:00
ubifs UBIFS: fix error messages spelling 2012-08-22 17:41:09 +03:00
udf udf: Fix data corruption for files in ICB 2012-09-05 16:06:03 +02:00
ufs fs/ufs: get rid of write_super 2012-07-22 23:58:16 +04:00
xfs xfs: check for possible overflow in xfs_ioc_trim 2012-08-23 14:48:44 -05:00
Kconfig Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-03-21 13:36:41 -07:00
Kconfig.binfmt C6X: add support to build with BINFMT_ELF_FDPIC 2012-05-15 09:17:34 -04:00
Makefile fs: initial qnx6fs addition 2012-03-20 21:29:38 -04:00
aio.c aio: now fput() is OK from interrupt context; get rid of manual delayed __fput() 2012-07-22 23:57:59 +04:00
anon_inodes.c anon_inodes: move allocation of anon_inode into ->mount() 2012-03-20 21:29:45 -04:00
attr.c notify_change(): check that i_mutex is held 2012-07-14 16:35:42 +04:00
bad_inode.c don't pass nameidata to ->create() 2012-07-14 16:34:47 +04:00
binfmt_aout.c VM: add "vm_mmap()" helper function 2012-04-20 17:29:13 -07:00
binfmt_elf.c binfmt_elf: switch elf_map() to vm_mmap/vm_munmap 2012-05-30 21:04:55 -04:00
binfmt_elf_fdpic.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2012-05-23 17:42:39 -07:00
binfmt_em86.c __register_binfmt() made void 2012-03-20 21:29:46 -04:00
binfmt_flat.c binfmt_flat: use vm_munmap, we are missing ->mmap_sem there 2012-05-30 21:04:56 -04:00
binfmt_misc.c vfs: Rename end_writeback() to clear_inode() 2012-05-06 13:43:41 +08:00
binfmt_script.c __register_binfmt() made void 2012-03-20 21:29:46 -04:00
binfmt_som.c VM: add "vm_mmap()" helper function 2012-04-20 17:29:13 -07:00
bio-integrity.c fs: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:21 +08:00
bio.c Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2012-08-25 11:36:43 -07:00
block_dev.c fs/block-dev.c:fix performance regression in O_DIRECT writes to md block devices 2012-08-02 09:50:39 +02:00
buffer.c block: replace __getblk_slow misfix by grow_dev_page fix 2012-08-23 12:17:36 +02:00
char_dev.c
…
compat.c vfs: missed source of ->f_pos races 2012-08-20 10:11:47 -07:00
compat_binfmt_elf.c
…
compat_ioctl.c The following text was taken from the original review request: 2012-03-24 10:24:31 -07:00
dcache.c vfs: dcache: use DCACHE_DENTRY_KILLED instead of DCACHE_DISCONNECTED in d_kill() 2012-09-18 11:23:51 -07:00
dcookies.c fs: reduce the use of module.h wherever possible 2012-02-28 19:31:58 -05:00
direct-io.c block: move down direct IO plugging 2012-08-09 15:23:09 +02:00
drop_caches.c
…
eventfd.c eventfd: change int to __u64 in eventfd_signal() 2012-05-31 17:49:32 -07:00
eventpoll.c eventpoll: use-after-possible-free in epoll_create1() 2012-08-22 10:26:55 -04:00
exec.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-08-01 10:26:23 -07:00
fcntl.c c/r: fcntl: add F_GETOWNER_UIDS option 2012-07-30 17:25:21 -07:00
fhandle.c
…
fifo.c fifo: Do not restart open() if it already found a partner 2012-07-16 08:33:14 -07:00
file.c Merge branch 'x86-x32-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-03-29 18:12:23 -07:00
file_table.c fs: Add freezing handling to mnt_want_write() / mnt_drop_write() 2012-07-31 09:40:38 +04:00
filesystems.c
…
fs-writeback.c mm: prepare for removal of obsolete /proc/sys/vm/nr_pdflush_threads 2012-07-31 18:42:40 -07:00
fs_struct.c get rid of ->mnt_longterm 2012-07-14 16:32:47 +04:00
generic_acl.c
…
inode.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-08-01 10:26:23 -07:00
internal.h fs: Add freezing handling to mnt_want_write() / mnt_drop_write() 2012-07-31 09:40:38 +04:00
ioctl.c fs: reduce the use of module.h wherever possible 2012-02-28 19:31:58 -05:00
ioprio.c Merge branch 'for-3.5/core' of git://git.kernel.dk/linux-block 2012-05-30 08:52:42 -07:00
libfs.c VFS: Pass mount flags to sget() 2012-07-14 16:38:34 +04:00
locks.c locks: remove unused lm_release_private 2012-08-01 09:01:46 -07:00
mbcache.c
…
mount.h get rid of magic in proc_namespace.c 2012-07-14 16:32:48 +04:00
mpage.c fs: reduce the use of module.h wherever possible 2012-02-28 19:31:58 -05:00
namei.c fs: fix fs/namei.c kernel-doc warnings 2012-08-22 10:30:10 -04:00
namespace.c fs: Add freezing handling to mnt_want_write() / mnt_drop_write() 2012-07-31 09:40:38 +04:00
no-block.c
…
open.c vfs: canonicalize create mode in build_open_flags() 2012-08-15 13:01:24 +02:00
pipe.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-08-01 10:26:23 -07:00
pnode.c VFS: Make clone_mnt()/copy_tree()/collect_mounts() return errors 2012-07-14 16:37:27 +04:00
pnode.h
…
posix_acl.c fs: reduce the use of module.h wherever possible 2012-02-28 19:31:58 -05:00
proc_namespace.c get rid of magic in proc_namespace.c 2012-07-14 16:32:48 +04:00
read_write.c vfs: allow custom EOF in generic_file_llseek code 2012-07-23 00:00:15 +04:00
read_write.h
…
readdir.c switch readdir/getdents to fget_light/fput_light 2012-05-29 23:28:29 -04:00
select.c posix_types.h: Cleanup stale __NFDBITS and related definitions 2012-07-26 13:36:43 -07:00
seq_file.c seq_file: Add seq_vprintf function and export it 2012-06-11 13:16:35 +01:00
signalfd.c switch signalfd4() to fget_light/fput_light 2012-05-29 23:28:30 -04:00
splice.c fs: Protect write paths by sb_start_write - sb_end_write 2012-07-31 09:45:47 +04:00
stack.c fs: reduce the use of module.h wherever possible 2012-02-28 19:31:58 -05:00
stat.c vfs: make O_PATH file descriptors usable for 'fstat()' 2012-09-14 14:48:21 -07:00
statfs.c switch statfs to fget_light/fput_light 2012-05-29 23:28:31 -04:00
super.c vfs: kill write_super and sync_supers 2012-08-04 01:24:44 +04:00
sync.c vfs: Avoid unnecessary WB_SYNC_NONE writeback during sys_sync and reorder sync passes 2012-07-22 23:59:01 +04:00
timerfd.c
…
utimes.c switch utimes() to fget_light/fput_light 2012-05-29 23:28:32 -04:00
xattr.c fs/xattr.c:getxattr(): improve handling of allocation failures 2012-07-30 17:25:11 -07:00
xattr_acl.c fs: reduce the use of module.h wherever possible 2012-02-28 19:31:58 -05:00