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| author | Mike Snitzer <snitzer@kernel.org> | 2024-11-16 04:40:53 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-09-19 17:35:43 +0300 |
| commit | a707c9a8380f1f4da0ee907a7ff9eaa976df29b1 (patch) | |
| tree | b3c73419652163d7096019b053784a39618c9ee9 /include | |
| parent | b0bf81e05b7aed44a9f1a5a09eca2e671bcff0d5 (diff) | |
| download | linux-a707c9a8380f1f4da0ee907a7ff9eaa976df29b1.tar.xz | |
nfs/localio: add direct IO enablement with sync and async IO support
[ Upstream commit 3feec68563dda59517f83d19123aa287a1dfd068 ]
This commit simply adds the required O_DIRECT plumbing. It doesn't
address the fact that NFS doesn't ensure all writes are page aligned
(nor device logical block size aligned as required by O_DIRECT).
Because NFS will read-modify-write for IO that isn't aligned, LOCALIO
will not use O_DIRECT semantics by default if/when an application
requests the use of O_DIRECT. Allow the use of O_DIRECT semantics by:
1: Adding a flag to the nfs_pgio_header struct to allow the NFS
O_DIRECT layer to signal that O_DIRECT was used by the application
2: Adding a 'localio_O_DIRECT_semantics' NFS module parameter that
when enabled will cause LOCALIO to use O_DIRECT semantics (this may
cause IO to fail if applications do not properly align their IO).
This commit is derived from code developed by Weston Andros Adamson.
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
Stable-dep-of: 992203a1fba5 ("nfs/localio: restore creds before releasing pageio data")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/nfs_xdr.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h index 12d8e47bc5a3..b48d94f09965 100644 --- a/include/linux/nfs_xdr.h +++ b/include/linux/nfs_xdr.h @@ -1637,6 +1637,7 @@ enum { NFS_IOHDR_RESEND_PNFS, NFS_IOHDR_RESEND_MDS, NFS_IOHDR_UNSTABLE_WRITES, + NFS_IOHDR_ODIRECT, }; struct nfs_io_completion; |