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| author | Olga Kornievskaia <olga.kornievskaia@gmail.com> | 2022-12-20 20:31:29 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-24 09:17:58 +0300 |
| commit | a869f7b0541174ee1e3b19df535cea0d29bbbbda (patch) | |
| tree | e7f5d8e231eafc0810498cd226ff64c51b30b705 /fs | |
| parent | 1349fe3a332ad3d1ece60806225ca7955aba9f56 (diff) | |
| download | linux-a869f7b0541174ee1e3b19df535cea0d29bbbbda.tar.xz | |
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>
Diffstat (limited to 'fs')
| -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 98b74cdabb99..8c72718d9fe0 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) { |