linux-toradex.git/fs/nfs, branch v6.12-rc1

Merge tag 'nfs-for-6.12-1' of git://git.linux-nfs.org/projects/anna/linux-nfs

2024-09-24T22:44:18+00:00

Pull NFS client updates from Anna Schumaker:
 "New Features:
   - Add a 'noalignwrite' mount option for lock-less 'lost writes' prevention
   - Add support for the LOCALIO protocol extention

  Bugfixes:
   - Fix memory leak in error path of nfs4_do_reclaim()
   - Simplify and guarantee lock owner uniqueness
   - Fix -Wformat-truncation warning
   - Fix folio refcounts by using folio_attach_private()
   - Fix failing the mount system call when the server is down
   - Fix detection of "Proxying of Times" server support

  Cleanups:
   - Annotate struct nfs_cache_array with __counted_by()
   - Remove unnecessary NULL checks before kfree()
   - Convert RPC_TASK_* constants to an enum
   - Remove obsolete or misleading comments and declerations"

* tag 'nfs-for-6.12-1' of git://git.linux-nfs.org/projects/anna/linux-nfs: (41 commits)
  nfs: Fix `make htmldocs` warnings in the localio documentation
  nfs: add "NFS Client and Server Interlock" section to localio.rst
  nfs: add FAQ section to Documentation/filesystems/nfs/localio.rst
  nfs: add Documentation/filesystems/nfs/localio.rst
  nfs: implement client support for NFS_LOCALIO_PROGRAM
  nfs/localio: use dedicated workqueues for filesystem read and write
  pnfs/flexfiles: enable localio support
  nfs: enable localio for non-pNFS IO
  nfs: add LOCALIO support
  nfs: pass struct nfsd_file to nfs_init_pgio and nfs_init_commit
  nfsd: implement server support for NFS_LOCALIO_PROGRAM
  nfsd: add LOCALIO support
  nfs_common: prepare for the NFS client to use nfsd_file for LOCALIO
  nfs_common: add NFS LOCALIO auxiliary protocol enablement
  SUNRPC: replace program list with program array
  SUNRPC: add svcauth_map_clnt_to_svc_cred_local
  SUNRPC: remove call_allocate() BUG_ONs
  nfsd: add nfsd_serv_try_get and nfsd_serv_put
  nfsd: add nfsd_file_acquire_local()
  nfsd: factor out __fh_verify to allow NULL rqstp to be passed
  ...

nfs: implement client support for NFS_LOCALIO_PROGRAM

2024-09-23T19:03:30+00:00

The LOCALIO auxiliary RPC protocol consists of a single "UUID_IS_LOCAL"
RPC method that allows the Linux NFS client to verify the local Linux
NFS server can see the nonce (single-use UUID) the client generated and
made available in nfs_common for subsequent lookup and verification
by the NFS server.  If matched, the NFS server populates members in the
nfs_uuid_t struct.  The NFS client then transfers these nfs_uuid_t
struct member pointers to the nfs_client struct and cleans up the
nfs_uuid_t struct.  See: fs/nfs/localio.c:nfs_local_probe()

This protocol isn't part of an IETF standard, nor does it need to be
considering it is Linux-to-Linux auxiliary RPC protocol that amounts
to an implementation detail.

Localio is only supported when UNIX-style authentication (AUTH_UNIX, aka
AUTH_SYS) is used (enforced by fs/nfs/localio.c:nfs_local_probe()).

The UUID_IS_LOCAL method encodes the client generated uuid_t in terms of
the fixed UUID_SIZE (16 bytes).  The fixed size opaque encode and decode
XDR methods are used instead of the less efficient variable sized
methods.

Having a nonce (single-use uuid) is better than using the same uuid
for the life of the server, and sending it proactively by client
rather than reactively by the server is also safer.

Signed-off-by: Mike Snitzer 
Co-developed-by: NeilBrown 
Signed-off-by: NeilBrown 
Reviewed-by: Jeff Layton 
Signed-off-by: Anna Schumaker

nfs/localio: use dedicated workqueues for filesystem read and write

2024-09-23T19:03:30+00:00

For localio access, don't call filesystem read() and write() routines
directly.  This solves two problems:

1) localio writes need to use a normal (non-memreclaim) unbound
   workqueue.  This avoids imposing new requirements on how underlying
   filesystems process frontend IO, which would cause a large amount
   of work to update all filesystems.  Without this change, when XFS
   starts getting low on space, XFS flushes work on a non-memreclaim
   work queue, which causes a priority inversion problem:

00573 workqueue: WQ_MEM_RECLAIM writeback:wb_workfn is flushing !WQ_MEM_RECLAIM xfs-sync/vdc:xfs_flush_inodes_worker
00573 WARNING: CPU: 6 PID: 8525 at kernel/workqueue.c:3706 check_flush_dependency+0x2a4/0x328
00573 Modules linked in:
00573 CPU: 6 PID: 8525 Comm: kworker/u71:5 Not tainted 6.10.0-rc3-ktest-00032-g2b0a133403ab #18502
00573 Hardware name: linux,dummy-virt (DT)
00573 Workqueue: writeback wb_workfn (flush-0:33)
00573 pstate: 400010c5 (nZcv daIF -PAN -UAO -TCO -DIT +SSBS BTYPE=--)
00573 pc : check_flush_dependency+0x2a4/0x328
00573 lr : check_flush_dependency+0x2a4/0x328
00573 sp : ffff0000c5f06bb0
00573 x29: ffff0000c5f06bb0 x28: ffff0000c998a908 x27: 1fffe00019331521
00573 x26: ffff0000d0620900 x25: ffff0000c5f06ca0 x24: ffff8000828848c0
00573 x23: 1fffe00018be0d8e x22: ffff0000c1210000 x21: ffff0000c75fde00
00573 x20: ffff800080bfd258 x19: ffff0000cad63400 x18: ffff0000cd3a4810
00573 x17: 0000000000000000 x16: 0000000000000000 x15: ffff800080508d98
00573 x14: 0000000000000000 x13: 204d49414c434552 x12: 1fffe0001b6eeab2
00573 x11: ffff60001b6eeab2 x10: dfff800000000000 x9 : ffff60001b6eeab3
00573 x8 : 0000000000000001 x7 : 00009fffe491154e x6 : ffff0000db775593
00573 x5 : ffff0000db775590 x4 : ffff0000db775590 x3 : 0000000000000000
00573 x2 : 0000000000000027 x1 : ffff600018be0d62 x0 : dfff800000000000
00573 Call trace:
00573  check_flush_dependency+0x2a4/0x328
00573  __flush_work+0x184/0x5c8
00573  flush_work+0x18/0x28
00573  xfs_flush_inodes+0x68/0x88
00573  xfs_file_buffered_write+0x128/0x6f0
00573  xfs_file_write_iter+0x358/0x448
00573  nfs_local_doio+0x854/0x1568
00573  nfs_initiate_pgio+0x214/0x418
00573  nfs_generic_pg_pgios+0x304/0x480
00573  nfs_pageio_doio+0xe8/0x240
00573  nfs_pageio_complete+0x160/0x480
00573  nfs_writepages+0x300/0x4f0
00573  do_writepages+0x12c/0x4a0
00573  __writeback_single_inode+0xd4/0xa68
00573  writeback_sb_inodes+0x470/0xcb0
00573  __writeback_inodes_wb+0xb0/0x1d0
00573  wb_writeback+0x594/0x808
00573  wb_workfn+0x5e8/0x9e0
00573  process_scheduled_works+0x53c/0xd90
00573  worker_thread+0x370/0x8c8
00573  kthread+0x258/0x2e8
00573  ret_from_fork+0x10/0x20

2) Some filesystem writeback routines can end up taking up a lot of
   stack space (particularly XFS).  Instead of risking running over
   due to the extra overhead from the NFS stack, we should just call
   these routines from a workqueue job.  Since we need to do this to
   address 1) above we're able to avoid possibly blowing the stack
   "for free".

Use of dedicated workqueues improves performance over using the
system_unbound_wq.

Also, the creds used to open the file are used to override_creds() in
both nfs_local_call_read() and nfs_local_call_write() -- otherwise the
workqueue could have elevated capabilities (which the caller may not).

Lastly, care is taken to set PF_LOCAL_THROTTLE | PF_MEMALLOC_NOIO in
nfs_do_local_write() to avoid writeback deadlocks.

The PF_LOCAL_THROTTLE flag prevents deadlocks in balance_dirty_pages()
by causing writes to only be throttled against other writes to the
same bdi (it keeps the throttling local).  Normally all writes to
bdi(s) are throttled equally (after throughput factors are allowed
for).

The PF_MEMALLOC_NOIO flag prevents the lower filesystem IO from
causing memory reclaim to re-enter filesystems or IO devices and so
prevents deadlocks from occuring where IO that cleans pages is
waiting on IO to complete.

Signed-off-by: Trond Myklebust 
Co-developed-by: Mike Snitzer 
Signed-off-by: Mike Snitzer 
Co-developed-by: NeilBrown 
Signed-off-by: NeilBrown  # eliminated wait_for_completion
Reviewed-by: Jeff Layton 
Signed-off-by: Anna Schumaker

pnfs/flexfiles: enable localio support

2024-09-23T19:03:30+00:00

If the DS is local to this client use localio to write the data.

Signed-off-by: Trond Myklebust 
Signed-off-by: Mike Snitzer 
Reviewed-by: NeilBrown 
Reviewed-by: Jeff Layton 
Signed-off-by: Anna Schumaker

nfs: enable localio for non-pNFS IO

2024-09-23T19:03:30+00:00

Try a local open of the file being written to, and if it succeeds,
then use localio to issue IO.

Signed-off-by: Trond Myklebust 
Signed-off-by: Mike Snitzer 
Reviewed-by: NeilBrown 
Reviewed-by: Jeff Layton 
Signed-off-by: Anna Schumaker

nfs: add LOCALIO support

2024-09-23T19:03:30+00:00

Add client support for bypassing NFS for localhost reads, writes, and
commits. This is only useful when the client and the server are
running on the same host.

nfs_local_probe() is stubbed out, later commits will enable client and
server handshake via a Linux-only LOCALIO auxiliary RPC protocol.

This has dynamic binding with the nfsd module (via nfs_localio module
which is part of nfs_common). LOCALIO will only work if nfsd is
already loaded.

The "localio_enabled" nfs kernel module parameter can be used to
disable and enable the ability to use LOCALIO support.

CONFIG_NFS_LOCALIO enables NFS client support for LOCALIO.

Lastly, LOCALIO uses an nfsd_file to initiate all IO. To make proper
use of nfsd_file (and nfsd's filecache) its lifetime (duration before
nfsd_file_put is called) must extend until after commit, read and
write operations. So rather than immediately drop the nfsd_file
reference in nfs_local_open_fh(), that doesn't happen until
nfs_local_pgio_release() for read/write and not until
nfs_local_release_commit_data() for commit. The same applies to the
reference held on nfsd's nn->nfsd_serv. Both objects' lifetimes and
associated references are managed through calls to
nfs_to->nfsd_file_put_local().

Signed-off-by: Weston Andros Adamson 
Signed-off-by: Trond Myklebust 
Co-developed-by: Mike Snitzer 
Signed-off-by: Mike Snitzer 
Signed-off-by: NeilBrown  # nfs_open_local_fh
Reviewed-by: Jeff Layton 
Signed-off-by: Anna Schumaker

nfs: pass struct nfsd_file to nfs_init_pgio and nfs_init_commit

2024-09-23T19:03:30+00:00

The nfsd_file will be passed, in future commits, by callers
that enable LOCALIO support (for both regular NFS and pNFS IO).

[Derived from patch authored by Weston Andros Adamson, but switched
 from passing struct file to struct nfsd_file]

Signed-off-by: Mike Snitzer 
Reviewed-by: NeilBrown 
Reviewed-by: Jeff Layton 
Signed-off-by: Anna Schumaker

nfs: factor out {encode,decode}_opaque_fixed to nfs_xdr.h

2024-09-23T19:03:29+00:00

Eliminates duplicate functions in various files to allow for
additional callers.

Signed-off-by: Mike Snitzer 
Reviewed-by: NeilBrown 
Reviewed-by: Jeff Layton 
Signed-off-by: Anna Schumaker

nfs_common: factor out nfs4_errtbl and nfs4_stat_to_errno

2024-09-23T19:03:29+00:00

Common nfs4_stat_to_errno() is used by fs/nfs/nfs4xdr.c and will be
used by fs/nfs/localio.c

Signed-off-by: Mike Snitzer 
Reviewed-by: Jeff Layton 
Reviewed-by: NeilBrown 
Signed-off-by: Anna Schumaker

nfs_common: factor out nfs_errtbl and nfs_stat_to_errno

2024-09-23T19:03:29+00:00

Common nfs_stat_to_errno() is used by both fs/nfs/nfs2xdr.c and
fs/nfs/nfs3xdr.c

Will also be used by fs/nfsd/localio.c

Signed-off-by: Mike Snitzer 
Reviewed-by: Jeff Layton 
Reviewed-by: NeilBrown 
Signed-off-by: Anna Schumaker