linux/fs/nfs
Jeff Layton 3064b6861d nfs: have flexfiles mirror keep creds for both ro and rw layouts
A mirror can be shared between multiple layouts, even with different
iomodes. That makes stats gathering simpler, but it causes a problem
when we get different creds in READ vs. RW layouts.

The current code drops the newer credentials onto the floor when this
occurs. That's problematic when you fetch a READ layout first, and then
a RW. If the READ layout doesn't have the correct creds to do a write,
then writes will fail.

We could just overwrite the READ credentials with the RW ones, but that
would break the ability for the server to fence the layout for reads if
things go awry. We need to be able to revert to the earlier READ creds
if the RW layout is returned afterward.

The simplest fix is to just keep two sets of creds per mirror. One for
READ layouts and one for RW, and then use the appropriate set depending
on the iomode of the layout segment.

Also fix up some RCU nits that sparse found.

Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
2016-05-09 09:05:40 -04:00
..
blocklayout mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
filelayout NFS: Save struct inode * inside nfs_commit_info to clarify usage of i_lock 2016-05-09 09:05:40 -04:00
flexfilelayout nfs: have flexfiles mirror keep creds for both ro and rw layouts 2016-05-09 09:05:40 -04:00
objlayout mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
cache_lib.c
cache_lib.h
callback_proc.c NFSv4.x: Fix NFS4ERR_RETRY_UNCACHED_REP in nfs4_callback_sequence 2016-02-01 12:06:24 -05:00
callback_xdr.c NFSv4.x: Allow multiple callbacks in flight 2016-01-25 09:36:21 -05:00
callback.c
callback.h NFSv4.x: Allow multiple callbacks in flight 2016-01-25 09:36:21 -05:00
client.c mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
delegation.c
delegation.h
dir.c These changes contains a fix for overlayfs interacting with some 2016-04-07 17:22:20 -07:00
direct.c NFS: Save struct inode * inside nfs_commit_info to clarify usage of i_lock 2016-05-09 09:05:40 -04:00
dns_resolve.c
dns_resolve.h
file.c mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
fscache-index.c
fscache.c
fscache.h
getroot.c
inode.c These changes contains a fix for overlayfs interacting with some 2016-04-07 17:22:20 -07:00
internal.h mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
iostat.h
Kconfig
Makefile
mount_clnt.c
namespace.c
netns.h
nfs2super.c
nfs2xdr.c
nfs3_fs.h
nfs3acl.c posix acls: Remove duplicate xattr name definitions 2015-12-06 21:25:17 -05:00
nfs3client.c
nfs3proc.c
nfs3super.c
nfs3xdr.c
nfs4_fs.h
nfs4client.c nfs4: start callback_ident at idr 1 2015-11-23 21:59:42 -05:00
nfs4file.c These changes contains a fix for overlayfs interacting with some 2016-04-07 17:22:20 -07:00
nfs4getroot.c
nfs4idmap.c
nfs4idmap.h
nfs4namespace.c
nfs4proc.c NFS client updates for Linux 4.6 2016-03-22 13:16:21 -07:00
nfs4renewd.c
nfs4session.c NFSv4.x: Allow multiple callbacks in flight 2016-01-25 09:36:21 -05:00
nfs4session.h NFSv4.x: Allow multiple callbacks in flight 2016-01-25 09:36:21 -05:00
nfs4state.c
nfs4super.c
nfs4sysctl.c nfs: do not initialise statics to 0 2015-12-28 09:57:15 -05:00
nfs4trace.c pNFS: Modify pnfs_update_layout tracepoints to use layout stateid 2015-12-28 09:57:14 -05:00
nfs4trace.h Merge branch 'bugfixes' 2016-01-07 18:45:36 -05:00
nfs4xdr.c mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
nfs42.h
nfs42proc.c nfs4: fix stateid handling for the NFS v4.2 operations 2016-02-17 11:38:07 -05:00
nfs42xdr.c
nfs.h
nfsroot.c
nfstrace.c
nfstrace.h NFS: Allow multiple commit requests in flight per file 2015-12-31 13:53:48 -05:00
pagelist.c mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
pnfs_dev.c
pnfs_nfs.c NFS: Save struct inode * inside nfs_commit_info to clarify usage of i_lock 2016-05-09 09:05:40 -04:00
pnfs.c pnfs: set NFS_IOHDR_REDO in pnfs_read_resend_pnfs 2016-05-09 09:05:40 -04:00
pnfs.h pnfs: set NFS_IOHDR_REDO in pnfs_read_resend_pnfs 2016-05-09 09:05:40 -04:00
proc.c
read.c mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
super.c
symlink.c switch ->get_link() to delayed_call, kill ->put_link() 2015-12-30 13:01:03 -05:00
sysctl.c
unlink.c
write.c NFS: Save struct inode * inside nfs_commit_info to clarify usage of i_lock 2016-05-09 09:05:40 -04:00