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authorChuck Lever <chuck.lever@oracle.com>2018-03-28 13:29:11 -0400
committerJ. Bruce Fields <bfields@redhat.com>2018-04-03 15:08:15 -0400
commit87c5942e8fae81ac296267654a047eb2db81592b (patch)
treede00193297b93692cfc86f475fe7cb6d6dbdc56a /fs/nfsd/vfs.c
parentd890be159a71395bd4ceca09233a8a56d7da69ee (diff)
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nfsd: Add I/O trace points in the NFSv4 read proc
NFSv4 read compound processing invokes nfsd_splice_read and nfs_readv directly, so the trace points currently in nfsd_read are not invoked for NFSv4 reads. Move the NFSD READ trace points to common helpers so that NFSv4 reads are captured. Also, record any local I/O error that occurs, the total count of bytes that were actually returned, and whether splice or vectored read was used. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd/vfs.c')
-rw-r--r--fs/nfsd/vfs.c34
1 files changed, 18 insertions, 16 deletions
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index ee59a0b24fab..2410b093a2e6 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -881,20 +881,24 @@ static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe,
return __splice_from_pipe(pipe, sd, nfsd_splice_actor);
}
-static __be32
-nfsd_finish_read(struct file *file, unsigned long *count, int host_err)
+static __be32 nfsd_finish_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
+ struct file *file, loff_t offset,
+ unsigned long *count, int host_err)
{
if (host_err >= 0) {
nfsdstats.io_read += host_err;
*count = host_err;
fsnotify_access(file);
+ trace_nfsd_read_io_done(rqstp, fhp, offset, *count);
return 0;
- } else
+ } else {
+ trace_nfsd_read_err(rqstp, fhp, offset, host_err);
return nfserrno(host_err);
+ }
}
-__be32 nfsd_splice_read(struct svc_rqst *rqstp,
- struct file *file, loff_t offset, unsigned long *count)
+__be32 nfsd_splice_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
+ struct file *file, loff_t offset, unsigned long *count)
{
struct splice_desc sd = {
.len = 0,
@@ -904,21 +908,23 @@ __be32 nfsd_splice_read(struct svc_rqst *rqstp,
};
int host_err;
+ trace_nfsd_read_splice(rqstp, fhp, offset, *count);
rqstp->rq_next_page = rqstp->rq_respages + 1;
host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor);
- return nfsd_finish_read(file, count, host_err);
+ return nfsd_finish_read(rqstp, fhp, file, offset, count, host_err);
}
-__be32 nfsd_readv(struct file *file, loff_t offset, struct kvec *vec, int vlen,
- unsigned long *count)
+__be32 nfsd_readv(struct svc_rqst *rqstp, struct svc_fh *fhp,
+ struct file *file, loff_t offset,
+ struct kvec *vec, int vlen, unsigned long *count)
{
struct iov_iter iter;
int host_err;
+ trace_nfsd_read_vector(rqstp, fhp, offset, *count);
iov_iter_kvec(&iter, READ | ITER_KVEC, vec, vlen, *count);
host_err = vfs_iter_read(file, &iter, &offset, 0);
-
- return nfsd_finish_read(file, count, host_err);
+ return nfsd_finish_read(rqstp, fhp, file, offset, count, host_err);
}
/*
@@ -1034,14 +1040,10 @@ __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
ra = nfsd_init_raparms(file);
- trace_nfsd_read_opened(rqstp, fhp, offset, *count);
-
if (file->f_op->splice_read && test_bit(RQ_SPLICE_OK, &rqstp->rq_flags))
- err = nfsd_splice_read(rqstp, file, offset, count);
+ err = nfsd_splice_read(rqstp, fhp, file, offset, count);
else
- err = nfsd_readv(file, offset, vec, vlen, count);
-
- trace_nfsd_read_io_done(rqstp, fhp, offset, *count);
+ err = nfsd_readv(rqstp, fhp, file, offset, vec, vlen, count);
if (ra)
nfsd_put_raparams(file, ra);