kernel/linux.git/fs/nfs/sysfs.c, branch linux-7.1.y

Merge tag 'nfsd-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux

2026-04-20T17:44:02+00:00

Pull nfsd updates from Chuck Lever: - filehandle signing to defend against filehandle-guessing attacks (Benjamin Coddington) The server now appends a SipHash-2-4 MAC to each filehandle when the new "sign_fh" export option is enabled. NFSD then verifies filehandles received from clients against the expected MAC; mismatches return NFS error STALE - convert the entire NLMv4 server-side XDR layer from hand-written C to xdrgen-generated code, spanning roughly thirty patches (Chuck Lever) XDR functions are generally boilerplate code and are easy to get wrong. The goals of this conversion are improved memory safety, lower maintenance burden, and groundwork for eventual Rust code generation for these functions. - improve pNFS block/SCSI layout robustness with two related changes (Dai Ngo) SCSI persistent reservation fencing is now tracked per client and per device via an xarray, to avoid both redundant preempt operations on devices already fenced and a potential NFSD deadlock when all nfsd threads are waiting for a layout return. - scalability and infrastructure improvements Sincere thanks to all contributors, reviewers, testers, and bug reporters who participated in the v7.1 NFSD development cycle. * tag 'nfsd-7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux: (83 commits) NFSD: Docs: clean up pnfs server timeout docs nfsd: fix comment typo in nfsxdr nfsd: fix comment typo in nfs3xdr NFSD: convert callback RPC program to per-net namespace NFSD: use per-operation statidx for callback procedures svcrdma: Use contiguous pages for RDMA Read sink buffers SUNRPC: Add svc_rqst_page_release() helper SUNRPC: xdr.h: fix all kernel-doc warnings svcrdma: Factor out WR chain linking into helper svcrdma: Add Write chunk WRs to the RPC's Send WR chain svcrdma: Clean up use of rdma->sc_pd->device svcrdma: Clean up use of rdma->sc_pd->device in Receive paths svcrdma: Add fair queuing for Send Queue access SUNRPC: Optimize rq_respages allocation in svc_alloc_arg SUNRPC: Track consumed rq_pages entries svcrdma: preserve rq_next_page in svc_rdma_save_io_pages SUNRPC: Handle NULL entries in svc_rqst_release_pages SUNRPC: Allocate a separate Reply page array SUNRPC: Tighten bounds checking in svc_rqst_replace_page NFSD: Sign filehandles ...

kernfs: pass struct ns_common instead of const void * for namespace tags

2026-04-09T12:36:52+00:00

kernfs has historically used const void * to pass around namespace tags used for directory-level namespace filtering. The only current user of this is sysfs network namespace tagging where struct net pointers are cast to void *. Replace all const void * namespace parameters with const struct ns_common * throughout the kernfs, sysfs, and kobject namespace layers. This includes the kobj_ns_type_operations callbacks, kobject_namespace(), and all sysfs/kernfs APIs that accept or return namespace tags. Passing struct ns_common is needed because various codepaths require access to the underlying namespace. A struct ns_common can always be converted back to the concrete namespace type (e.g., struct net) via container_of() or to_ns_common() in the reverse direction. This is a preparatory change for switching to ns_id-based directory iteration to prevent a KASLR pointer leak through the current use of raw namespace pointers as hash seeds and comparison keys. Signed-off-by: Christian Brauner

NFS: Use nlmclnt_shutdown_rpc_clnt() to safely shut down NLM

2026-03-30T01:25:09+00:00

A race condition exists in shutdown_store() when writing to the sysfs "shutdown" file concurrently with nlm_shutdown_hosts_net(). Without synchronization, the following sequence can occur: 1. shutdown_store() reads server->nlm_host (non-NULL) 2. nlm_shutdown_hosts_net() acquires nlm_host_mutex, calls rpc_shutdown_client(), sets h_rpcclnt to NULL, and potentially frees the host via nlm_gc_hosts() 3. shutdown_store() dereferences the now-stale or freed host Introduce nlmclnt_shutdown_rpc_clnt(), which acquires nlm_host_mutex before accessing h_rpcclnt. This synchronizes with nlm_shutdown_hosts_net() and ensures the rpc_clnt pointer remains valid during the shutdown operation. This change also improves API layering: NFS client code no longer needs to include the internal lockd header to access nlm_host fields. The new helper resides in bind.h alongside other public lockd interfaces. Reported-by: Jeff Layton Reviewed-by: Jeff Layton Signed-off-by: Chuck Lever

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

NFS: Merge CONFIG_NFS_V4_1 with CONFIG_NFS_V4

2026-01-30T16:42:21+00:00

Compiling the NFSv4 module without any minorversion support doesn't make much sense, so this patch sets NFS v4.1 as the default, always enabled NFS version allowing us to replace all the CONFIG_NFS_V4_1s scattered throughout the code with CONFIG_NFS_V4. Signed-off-by: Anna Schumaker

NFS: sysfs: fix leak when nfs_client kobject add fails

2025-11-10T19:30:45+00:00

If adding the second kobject fails, drop both references to avoid sysfs residue and memory leak. Fixes: e96f9268eea6 ("NFS: Make all of /sys/fs/nfs network-namespace unique") Signed-off-by: Yang Xiuwei Reviewed-by: Benjamin Coddington Signed-off-by: Anna Schumaker

NFS: add localio to sysfs

2025-05-28T21:17:13+00:00

The Linux NFS client and server added support for LOCALIO in Linux v6.12. It is useful to know if a client and server negotiated LOCALIO be used, so expose it through the 'localio' attribute. Suggested-by: Anna Schumaker Signed-off-by: Mike Snitzer Signed-off-by: Anna Schumaker

NFS: Shut down the nfs_client only after all the superblocks

2025-03-26T16:17:48+00:00

The nfs_client manages state for all the superblocks in the "cl_superblocks" list, so it must not be shut down until all of them are gone. Fixes: 7d3e26a054c8 ("NFS: Cancel all existing RPC tasks when shutdown") Reviewed-by: Benjamin Coddington Signed-off-by: Trond Myklebust

NFS: Add implid to sysfs

2025-03-21T13:34:52+00:00

The Linux NFS server added support for returning this information during an EXCHANGE_ID in Linux v6.13. This is something and admin might want to query, so let's add it to sysfs. Reviewed-by: Benjamin Coddington Signed-off-by: Anna Schumaker Link: https://lore.kernel.org/r/20250207204225.594002-2-anna@kernel.org Signed-off-by: Trond Myklebust