kernel/git/stable/linux-stable.git/fs/nfs/flexfilelayout/flexfilelayout.h, branch master

NFSv4/flexfiles: honor FF_FLAGS_NO_IO_THRU_MDS in pg_get_mirror_count_write

2026-06-08T16:06:41+00:00

The FF_FLAGS_NO_IO_THRU_MDS flag lives on each lseg, so any fallback decision made when there is no current lseg (e.g. between LAYOUTRETURN and the next LAYOUTGET) cannot run the per-lseg check. Introduce a sticky hdr-level ditto for FF_FLAGS_NO_IO_THRU_MDS in struct nfs4_flexfile_layout::flags (NFS4_FF_HDR_NO_IO_THRU_MDS bit), set whenever ff_layout_alloc_lseg() parses an lseg with the flag. The bit is never cleared for the lifetime of the layout hdr; the server is assumed to be consistent in its no-fallback policy per file. kzalloc() in ff_layout_alloc_layout_hdr() zero-initializes the field. Use the new ff_layout_hdr_no_fallback_to_mds() helper to gate ff_layout_pg_get_mirror_count_write(): when pnfs_update_layout() returns NULL (e.g. NFS_LAYOUT_BULK_RECALL, pnfs_layout_io_test_failed, pnfs_layoutgets_blocked) the existing code unconditionally calls nfs_pageio_reset_write_mds(). This is a source of unwanted WRITE to MDS. Fix it by checking NFS4_FF_HDR_NO_IO_THRU_MDS bit, and if set surface -EAGAIN instead; the writepage-side caller (nfs_do_writepage() for buffered, nfs_direct_write_reschedule() for O_DIRECT) then redirties the request so writeback retries via pNFS. Fixes: 260074cd8413 ("pNFS/flexfiles: Add support for FF_FLAGS_NO_IO_THRU_MDS") Assisted-by: Claude:claude-opus-4-7 Signed-off-by: Mike Snitzer Signed-off-by: Anna Schumaker

NFSv4/flexfiles: Add support for striped layouts

2025-09-26T19:43:40+00:00

Updates lseg creation path to parse and add striped layouts. Enable support for striped layouts. Limitations: 1. All mirrors must have the same number of stripes. Signed-off-by: Jonathan Curley Signed-off-by: Anna Schumaker

NFSv4/flexfiles: Update low level helper functions to be DS stripe aware.

2025-09-26T19:35:02+00:00

Updates common helper functions to be dss_id aware. Most cases simply add a dss_id parameter. The has_available functions have been updated with a loop. Signed-off-by: Jonathan Curley Signed-off-by: Anna Schumaker

NFSv4/flexfiles: Add data structure support for striped layouts

2025-09-26T19:32:24+00:00

Adds a new struct nfs4_ff_layout_ds_stripe that represents a data server stripe within a layout. A new dynamically allocated array of this type has been added to nfs4_ff_layout_mirror and per stripe configuration information has been moved from the mirror type to the stripe based on the RFC. Signed-off-by: Jonathan Curley Signed-off-by: Anna Schumaker

nfs: cache all open LOCALIO nfsd_file(s) in client

2025-01-14T22:04:05+00:00

This commit switches from leaning heavily on NFSD's filecache (in terms of GC'd nfsd_files) back to caching nfsd_files in the client. A later commit will add the callback mechanism needed to allow NFSD to force the NFS client to cleanup all cached nfsd_files. Add nfs_fh_localio_init() and 'struct nfs_fh_localio' to cache opened nfsd_file(s) (both a RO and RW nfsd_file is able to be opened and cached for a given nfs_fh). Update nfs_local_open_fh() to cache the nfsd_file once it is opened using __nfs_local_open_fh(). Introduce nfs_close_local_fh() to clear the cached open nfsd_files and call nfs_to_nfsd_file_put_local(). Refcounting is such that: - nfs_local_open_fh() is paired with nfs_close_local_fh(). - __nfs_local_open_fh() is paired with nfs_to_nfsd_file_put_local(). - nfs_local_file_get() is paired with nfs_local_file_put(). Signed-off-by: Mike Snitzer Reviewed-by: Jeff Layton Signed-off-by: Anna Schumaker

NFS/flexfiles: Annotate struct nfs4_ff_layout_segment with __counted_by

2023-10-02T16:48:53+00:00

Prepare for the coming implementation by GCC and Clang of the __counted_by attribute. Flexible array members annotated with __counted_by can have their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family functions). As found with Coccinelle[1], add __counted_by for struct nfs4_ff_layout_segment. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Trond Myklebust Cc: Anna Schumaker Cc: linux-nfs@vger.kernel.org Reviewed-by: "Gustavo A. R. Silva" Link: https://lore.kernel.org/r/20230915201434.never.346-kees@kernel.org Signed-off-by: Kees Cook

pNFS/flexfiles: Simplify allocation of the mirror array

2020-03-26T14:52:04+00:00

Just allocate the array at the end of the layout segment structure, instead of allocating it as a separate array of pointers. Signed-off-by: Trond Myklebust

NFS/flexfile: Simplify nfs4_ff_layout_select_ds_stateid()

2019-03-02T03:37:38+00:00

Pass in a pointer to the mirror rather than forcing another array access. Signed-off-by: Trond Myklebust

NFS/flexfile: Simplify nfs4_ff_layout_ds_version()

2019-03-02T03:37:38+00:00

Pass in a pointer to the mirror rather than forcing another array access. Signed-off-by: Trond Myklebust

NFS/flexfiles: Simplify ff_layout_get_ds_cred()

2019-03-02T03:37:38+00:00

Pass in a pointer to the mirror rather than forcing another array access. Signed-off-by: Trond Myklebust