linux-toradex.git/fs/nfs/read.c, branch v3.12-rc2

NFSv4: Don't try to recover NFSv4 locks when they are lost.

2013-09-04T16:26:32+00:00

When an NFSv4 client loses contact with the server it can lose any
locks that it holds.

Currently when it reconnects to the server it simply tries to reclaim
those locks.  This might succeed even though some other client has
held and released a lock in the mean time.  So the first client might
think the file is unchanged, but it isn't.  This isn't good.

If, when recovery happens, the locks cannot be claimed because some
other client still holds the lock, then we get a message in the kernel
logs, but the client can still write.  So two clients can both think
they have a lock and can both write at the same time.  This is equally
not good.

There was a patch a while ago
  http://comments.gmane.org/gmane.linux.nfs/41917

which tried to address some of this, but it didn't seem to go
anywhere.  That patch would also send a signal to the process.  That
might be useful but for now this patch just causes writes to fail.

For NFSv4 (unlike v2/v3) there is a strong link between the lock and
the write request so we can fairly easily fail any IO of the lock is
gone.  While some applications might not expect this, it is still
safer than allowing the write to succeed.

Because this is a fairly big change in behaviour a module parameter,
"recover_locks", is introduced which defaults to true (the current
behaviour) but can be set to "false" to tell the client not to try to
recover things that were lost.

Signed-off-by: NeilBrown 
Signed-off-by: Trond Myklebust

NFS: Don't accept more reads/writes if the open context recovery failed

2013-03-25T16:04:10+00:00

If the state recovery failed, we want to ensure that the application
doesn't try to use the same file descriptor for more reads or writes.

Signed-off-by: Trond Myklebust

NFS: Ensure that we free the rpc_task after read and write cleanups are done

2013-01-04T17:59:10+00:00

This patch ensures that we free the rpc_task after the cleanup callbacks
are done in order to avoid a deadlock problem that can be triggered if
the callback needs to wait for another workqueue item to complete.

Signed-off-by: Trond Myklebust 
Cc: Weston Andros Adamson 
Cc: Tejun Heo 
Cc: Bruce Fields 
Cc: stable@vger.kernel.org [>= 3.5]

Merge branch 'akpm' (Andrew's patch-bomb)

2012-08-01T02:25:39+00:00

Merge Andrew's second set of patches:
 - MM
 - a few random fixes
 - a couple of RTC leftovers

* emailed patches from Andrew Morton : (120 commits)
  rtc/rtc-88pm80x: remove unneed devm_kfree
  rtc/rtc-88pm80x: assign ret only when rtc_register_driver fails
  mm: hugetlbfs: close race during teardown of hugetlbfs shared page tables
  tmpfs: distribute interleave better across nodes
  mm: remove redundant initialization
  mm: warn if pg_data_t isn't initialized with zero
  mips: zero out pg_data_t when it's allocated
  memcg: gix memory accounting scalability in shrink_page_list
  mm/sparse: remove index_init_lock
  mm/sparse: more checks on mem_section number
  mm/sparse: optimize sparse_index_alloc
  memcg: add mem_cgroup_from_css() helper
  memcg: further prevent OOM with too many dirty pages
  memcg: prevent OOM with too many dirty pages
  mm: mmu_notifier: fix freed page still mapped in secondary MMU
  mm: memcg: only check anon swapin page charges for swap cache
  mm: memcg: only check swap cache pages for repeated charging
  mm: memcg: split swapin charge function into private and public part
  mm: memcg: remove needless !mm fixup to init_mm when charging
  mm: memcg: remove unneeded shmem charge type
  ...

nfs: teach the NFS client how to treat PG_swapcache pages

2012-08-01T01:42:47+00:00

Replace all relevant occurences of page->index and page->mapping in the
NFS client with the new page_file_index() and page_file_mapping()
functions.

Signed-off-by: Peter Zijlstra 
Signed-off-by: Mel Gorman 
Acked-by: Rik van Riel 
Cc: Christoph Hellwig 
Cc: David S. Miller 
Cc: Eric B Munson 
Cc: Eric Paris 
Cc: James Morris 
Cc: Mel Gorman 
Cc: Mike Christie 
Cc: Neil Brown 
Cc: Sebastian Andrzej Siewior 
Cc: Trond Myklebust 
Cc: Xiaotian Feng 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

NFS: Convert v4 into a module

2012-07-30T23:06:52+00:00

This patch exports symbols needed by the v4 module.  In addition, I also
switch over to using IS_ENABLED() to check if CONFIG_NFS_V4 or
CONFIG_NFS_V4_MODULE are set.

The module (nfs4.ko) will be created in the same directory as nfs.ko and
will be automatically loaded the first time you try to mount over NFS v4.

Signed-off-by: Bryan Schumaker 
Signed-off-by: Trond Myklebust

NFS: Convert v2 into a module

2012-07-30T23:06:41+00:00

The module (nfs2.ko) will be created in the same directory as nfs.ko and
will be automatically loaded the first time you try to mount over NFS v2.

Signed-off-by: Bryan Schumaker 
Signed-off-by: Trond Myklebust

NFS: Create an read_pageio_init() function

2012-06-29T15:46:46+00:00

pNFS needs to select a read function based on the layout driver
currently in use, so I let each NFS version decide how to best handle
initializing reads.

Signed-off-by: Bryan Schumaker 
Signed-off-by: Trond Myklebust

NFSv4.1 add nfs_inode book keeping for mdsthreshold

2012-05-24T20:15:48+00:00

Keep track of the number of bytes read or written via buffered, direct, and
mem-mapped i/o for use by mdsthreshold size_io hints.

Signed-off-by: Andy Adamson 
Signed-off-by: Trond Myklebust

NFSv4.1 set RPC_TASK_SOFTCONN for filelayout DS RPC calls

2012-05-19T21:54:19+00:00

RPC_TASK_SOFTCONN returns connection errors to the caller which allows the pNFS
file layout to quickly try the MDS or perhaps another DS.

Signed-off-by: Andy Adamson 
Signed-off-by: Trond Myklebust