From d890be159a71395bd4ceca09233a8a56d7da69ee Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Tue, 27 Mar 2018 10:53:27 -0400 Subject: nfsd: Add I/O trace points in the NFSv4 write path NFSv4 write compound processing invokes nfsd_vfs_write directly. The trace points currently in nfsd_write are not effective for NFSv4 writes. Move the trace points into the shared nfsd_vfs_write() helper. After the I/O, we also want to record any local I/O error that might have occurred, and the total count of bytes that were actually moved (rather than the requested number). Signed-off-by: Chuck Lever Signed-off-by: J. Bruce Fields --- fs/nfsd/vfs.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) (limited to 'fs/nfsd/vfs.c') diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c index 857031952970..ee59a0b24fab 100644 --- a/fs/nfsd/vfs.c +++ b/fs/nfsd/vfs.c @@ -965,13 +965,15 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, { struct svc_export *exp; struct iov_iter iter; - __be32 err = 0; + __be32 nfserr; int host_err; int use_wgather; loff_t pos = offset; unsigned int pflags = current->flags; rwf_t flags = 0; + trace_nfsd_write_opened(rqstp, fhp, offset, *cnt); + if (test_bit(RQ_LOCAL, &rqstp->rq_flags)) /* * We want less throttling in balance_dirty_pages() @@ -994,22 +996,23 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, host_err = vfs_iter_write(file, &iter, &pos, flags); if (host_err < 0) goto out_nfserr; - *cnt = host_err; - nfsdstats.io_write += host_err; + nfsdstats.io_write += *cnt; fsnotify_modify(file); if (stable && use_wgather) host_err = wait_for_concurrent_writes(file); out_nfserr: - dprintk("nfsd: write complete host_err=%d\n", host_err); - if (host_err >= 0) - err = 0; - else - err = nfserrno(host_err); + if (host_err >= 0) { + trace_nfsd_write_io_done(rqstp, fhp, offset, *cnt); + nfserr = nfs_ok; + } else { + trace_nfsd_write_err(rqstp, fhp, offset, host_err); + nfserr = nfserrno(host_err); + } if (test_bit(RQ_LOCAL, &rqstp->rq_flags)) current_restore_flags(pflags, PF_LESS_THROTTLE); - return err; + return nfserr; } /* @@ -1067,9 +1070,7 @@ nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t offset, if (err) goto out; - trace_nfsd_write_opened(rqstp, fhp, offset, *cnt); err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, stable); - trace_nfsd_write_io_done(rqstp, fhp, offset, *cnt); fput(file); out: trace_nfsd_write_done(rqstp, fhp, offset, *cnt); -- cgit