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| author | Olga Kornievskaia <olga.kornievskaia@gmail.com> | 2022-12-20 12:31:29 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-24 07:05:18 +0100 |
| commit | 9bf15159c70ed5fcb50168495f8a306752cc43e8 (patch) | |
| tree | 550c3aaeb48abc37549af449765f7f6fec39427d | |
| parent | 97205fccccdc5c145b77c434135ee8429b03ed98 (diff) | |
| download | linux-stable-9bf15159c70ed5fcb50168495f8a306752cc43e8.tar.gz linux-stable-9bf15159c70ed5fcb50168495f8a306752cc43e8.tar.bz2 linux-stable-9bf15159c70ed5fcb50168495f8a306752cc43e8.zip | |
pNFS/filelayout: Fix coalescing test for single DS
[ Upstream commit a6b9d2fa0024e7e399c26facd0fb466b7396e2b9 ]
When there is a single DS no striping constraints need to be placed on
the IO. When such constraint is applied then buffered reads don't
coalesce to the DS's rsize.
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | fs/nfs/filelayout/filelayout.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/nfs/filelayout/filelayout.c b/fs/nfs/filelayout/filelayout.c index 38179e5a6a00..9b24d0bc9b39 100644 --- a/fs/nfs/filelayout/filelayout.c +++ b/fs/nfs/filelayout/filelayout.c @@ -837,6 +837,12 @@ filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid, return &fl->generic_hdr; } +static bool +filelayout_lseg_is_striped(const struct nfs4_filelayout_segment *flseg) +{ + return flseg->num_fh > 1; +} + /* * filelayout_pg_test(). Called by nfs_can_coalesce_requests() * @@ -857,6 +863,8 @@ filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, size = pnfs_generic_pg_test(pgio, prev, req); if (!size) return 0; + else if (!filelayout_lseg_is_striped(FILELAYOUT_LSEG(pgio->pg_lseg))) + return size; /* see if req and prev are in the same stripe */ if (prev) { |