Date: Fri, 24 Sep 2021 00:08:40 GMT From: Rick Macklem <rmacklem@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: ed03973908e5 - stable/13 - VOP_COPY_FILE_RANGE: Add a COPY_FILE_RANGE_TIMEO1SEC flag Message-ID: <202109240008.18O08e6K009436@gitrepo.freebsd.org>
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The branch stable/13 has been updated by rmacklem: URL: https://cgit.FreeBSD.org/src/commit/?id=ed03973908e5b9cfe41a156f8b78445c332fc864 commit ed03973908e5b9cfe41a156f8b78445c332fc864 Author: Rick Macklem <rmacklem@FreeBSD.org> AuthorDate: 2021-09-08 00:35:26 +0000 Commit: Rick Macklem <rmacklem@FreeBSD.org> CommitDate: 2021-09-24 00:04:29 +0000 VOP_COPY_FILE_RANGE: Add a COPY_FILE_RANGE_TIMEO1SEC flag Although it is not specified in the RFCs, the concept that the NFSv4 server should reply to an RPC request within a reasonable time is accepted practice within the NFSv4 community. Without this patch, the NFSv4.2 server attempts to reply to a Copy operation within 1second by limiting the copy to vfs.nfs.maxcopyrange bytes (default 10Mbytes). This is crude at best, given the large variation in I/O subsystem performance. This patch adds a kernel only flag COPY_FILE_RANGE_TIMEO1SEC that the NFSv4.2 can specify, which tells VOP_COPY_FILE_RANGE() to return after approximately 1 second with a partial result and implements this in vn_generic_copy_file_range(), used by vop_stdcopyfilerange(). Modifying the NFSv4.2 server to set this flag will be done in a separate patch. Also under consideration is exposing the COPY_FILE_RANGE_TIMEO1SEC to userland for use on the FreeBSD copy_file_range(2) syscall. Although this technically does change the VFS/VOP KAPI, I do not think the MFC will cause problems. (cherry picked from commit c5128c48df3c2f3828432aff2ea536bb9c887e14) --- sys/kern/vfs_vnops.c | 31 +++++++++++++++++++++++++++++-- sys/sys/vnode.h | 4 ++++ 2 files changed, 33 insertions(+), 2 deletions(-) diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c index 8f5442bf3429..8ff78b9d6319 100644 --- a/sys/kern/vfs_vnops.c +++ b/sys/kern/vfs_vnops.c @@ -3142,6 +3142,7 @@ vn_generic_copy_file_range(struct vnode *invp, off_t *inoffp, size_t copylen, len, rem, savlen; char *dat; long holein, holeout; + struct timespec curts, endts; holein = holeout = 0; savlen = len = *lenp; @@ -3238,7 +3239,15 @@ vn_generic_copy_file_range(struct vnode *invp, off_t *inoffp, * in the inner loop where the data copying is done. * Note that some file systems such as NFSv3, NFSv4.0 and NFSv4.1 may * support holes on the server, but do not support FIOSEEKHOLE. + * The kernel flag COPY_FILE_RANGE_TIMEO1SEC is used to indicate + * that this function should return after 1second with a partial + * completion. */ + if ((flags & COPY_FILE_RANGE_TIMEO1SEC) != 0) { + getnanouptime(&endts); + endts.tv_sec++; + } else + timespecclear(&endts); holetoeof = eof = false; while (len > 0 && error == 0 && !eof && interrupted == 0) { endoff = 0; /* To shut up compilers. */ @@ -3307,8 +3316,17 @@ vn_generic_copy_file_range(struct vnode *invp, off_t *inoffp, *inoffp += xfer; *outoffp += xfer; len -= xfer; - if (len < savlen) + if (len < savlen) { interrupted = sig_intr(); + if (timespecisset(&endts) && + interrupted == 0) { + getnanouptime(&curts); + if (timespeccmp(&curts, + &endts, >=)) + interrupted = + EINTR; + } + } } } copylen = MIN(len, endoff - startoff); @@ -3371,8 +3389,17 @@ vn_generic_copy_file_range(struct vnode *invp, off_t *inoffp, *outoffp += xfer; copylen -= xfer; len -= xfer; - if (len < savlen) + if (len < savlen) { interrupted = sig_intr(); + if (timespecisset(&endts) && + interrupted == 0) { + getnanouptime(&curts); + if (timespeccmp(&curts, + &endts, >=)) + interrupted = + EINTR; + } + } } } xfer = blksize; diff --git a/sys/sys/vnode.h b/sys/sys/vnode.h index 8336fd859781..4a2581cb3db3 100644 --- a/sys/sys/vnode.h +++ b/sys/sys/vnode.h @@ -613,6 +613,10 @@ typedef void vop_getpages_iodone_t(void *, vm_page_t *, int, int); #define VN_OPEN_NAMECACHE 0x00000004 #define VN_OPEN_INVFS 0x00000008 +/* copy_file_range kernel flags */ +#define COPY_FILE_RANGE_KFLAGS 0xff000000 +#define COPY_FILE_RANGE_TIMEO1SEC 0x01000000 /* Return after 1sec. */ + /* * Public vnode manipulation functions. */
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