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authorChuck Lever2018-03-27 10:53:27 -0400
committerJ. Bruce Fields2018-04-03 15:08:15 -0400
commitd890be159a71395bd4ceca09233a8a56d7da69ee (patch)
treec8e7089ab7e52770d57842ecd189275de08bd789 /fs/nfsd
parentf394b62b7b0dd24757e9813e19f4b6091c5a28f6 (diff)
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 <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/nfs4proc.c7
-rw-r--r--fs/nfsd/trace.h33
-rw-r--r--fs/nfsd/vfs.c23
3 files changed, 50 insertions, 13 deletions
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 792fbb851046..b773b314f599 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1001,6 +1001,9 @@ nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
if (write->wr_offset >= OFFSET_MAX)
return nfserr_inval;
+ cnt = write->wr_buflen;
+ trace_nfsd_write_start(rqstp, &cstate->current_fh,
+ write->wr_offset, cnt);
status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
stateid, WR_STATE, &filp, NULL);
if (status) {
@@ -1008,7 +1011,6 @@ nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
return status;
}
- cnt = write->wr_buflen;
write->wr_how_written = write->wr_stable_how;
gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
@@ -1021,7 +1023,8 @@ nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
fput(filp);
write->wr_bytes_written = cnt;
-
+ trace_nfsd_write_done(rqstp, &cstate->current_fh,
+ write->wr_offset, cnt);
return status;
}
diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index 30e04852a4e0..653e9ee754d2 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -51,6 +51,39 @@ DEFINE_NFSD_IO_EVENT(write_opened);
DEFINE_NFSD_IO_EVENT(write_io_done);
DEFINE_NFSD_IO_EVENT(write_done);
+DECLARE_EVENT_CLASS(nfsd_err_class,
+ TP_PROTO(struct svc_rqst *rqstp,
+ struct svc_fh *fhp,
+ loff_t offset,
+ int status),
+ TP_ARGS(rqstp, fhp, offset, status),
+ TP_STRUCT__entry(
+ __field(u32, xid)
+ __field(u32, fh_hash)
+ __field(loff_t, offset)
+ __field(int, status)
+ ),
+ TP_fast_assign(
+ __entry->xid = be32_to_cpu(rqstp->rq_xid);
+ __entry->fh_hash = knfsd_fh_hash(&fhp->fh_handle);
+ __entry->offset = offset;
+ __entry->status = status;
+ ),
+ TP_printk("xid=0x%08x fh_hash=0x%08x offset=%lld status=%d",
+ __entry->xid, __entry->fh_hash,
+ __entry->offset, __entry->status)
+)
+
+#define DEFINE_NFSD_ERR_EVENT(name) \
+DEFINE_EVENT(nfsd_err_class, nfsd_##name, \
+ TP_PROTO(struct svc_rqst *rqstp, \
+ struct svc_fh *fhp, \
+ loff_t offset, \
+ int len), \
+ TP_ARGS(rqstp, fhp, offset, len))
+
+DEFINE_NFSD_ERR_EVENT(write_err);
+
#include "state.h"
DECLARE_EVENT_CLASS(nfsd_stateid_class,
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);