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| author | Olga Kornievskaia <olga.kornievskaia@gmail.com> | 2022-12-20 12:31:29 -0500 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@hammerspace.com> | 2022-12-20 12:52:39 -0500 |
| commit | a6b9d2fa0024e7e399c26facd0fb466b7396e2b9 (patch) | |
| tree | 095f5ac75fd942d0410be9f583bed23a5f8415af /fs/nfs/filelayout | |
| parent | b18cba09e374637a0a3759d856a6bca94c133952 (diff) | |
| download | linux-stable-a6b9d2fa0024e7e399c26facd0fb466b7396e2b9.tar.gz linux-stable-a6b9d2fa0024e7e399c26facd0fb466b7396e2b9.tar.bz2 linux-stable-a6b9d2fa0024e7e399c26facd0fb466b7396e2b9.zip | |
pNFS/filelayout: Fix coalescing test for single DS
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>
Diffstat (limited to 'fs/nfs/filelayout')
| -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 ad34a33b0737..4974cd18ca46 100644 --- a/fs/nfs/filelayout/filelayout.c +++ b/fs/nfs/filelayout/filelayout.c @@ -783,6 +783,12 @@ 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() * @@ -803,6 +809,8 @@ 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) { |