From: Chuck Lever chuck.lever@oracle.com
[ Upstream commit d7064eaf688cfe454c50db9f59298463d80d403c ]
Add a tracepoint to capture the number of filecache-triggered fsync calls and which files needed it. Also, record when an fsync triggers a write verifier reset.
Examples:
<...>-97 [007] 262.505611: nfsd_file_free: inode=0xffff888171e08140 ref=0 flags=GC may=WRITE nf_file=0xffff8881373d2400 <...>-97 [007] 262.505612: nfsd_file_fsync: inode=0xffff888171e08140 ref=0 flags=GC may=WRITE nf_file=0xffff8881373d2400 ret=0 <...>-97 [007] 262.505623: nfsd_file_free: inode=0xffff888171e08dc0 ref=0 flags=GC may=WRITE nf_file=0xffff8881373d1e00 <...>-97 [007] 262.505624: nfsd_file_fsync: inode=0xffff888171e08dc0 ref=0 flags=GC may=WRITE nf_file=0xffff8881373d1e00 ret=0
Signed-off-by: Chuck Lever chuck.lever@oracle.com Reviewed-by: Jeff Layton jlayton@kernel.org Stable-dep-of: 0b3a551fa58b ("nfsd: fix handling of cached open files in nfsd4_open codepath") Signed-off-by: Sasha Levin sashal@kernel.org --- fs/nfsd/filecache.c | 5 ++++- fs/nfsd/trace.h | 31 +++++++++++++++++++++++++++++++ 2 files changed, 35 insertions(+), 1 deletion(-)
diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c index f54dd6695741..7c673f98f95c 100644 --- a/fs/nfsd/filecache.c +++ b/fs/nfsd/filecache.c @@ -314,10 +314,13 @@ static void nfsd_file_fsync(struct nfsd_file *nf) { struct file *file = nf->nf_file; + int ret;
if (!file || !(file->f_mode & FMODE_WRITE)) return; - if (vfs_fsync(file, 1) != 0) + ret = vfs_fsync(file, 1); + trace_nfsd_file_fsync(nf, ret); + if (ret) nfsd_reset_write_verifier(net_generic(nf->nf_net, nfsd_net_id)); }
diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h index 55e9e19cb1ec..08e2738adf8f 100644 --- a/fs/nfsd/trace.h +++ b/fs/nfsd/trace.h @@ -1182,6 +1182,37 @@ DEFINE_EVENT(nfsd_file_lruwalk_class, name, \ DEFINE_NFSD_FILE_LRUWALK_EVENT(nfsd_file_gc_removed); DEFINE_NFSD_FILE_LRUWALK_EVENT(nfsd_file_shrinker_removed);
+TRACE_EVENT(nfsd_file_fsync, + TP_PROTO( + const struct nfsd_file *nf, + int ret + ), + TP_ARGS(nf, ret), + TP_STRUCT__entry( + __field(void *, nf_inode) + __field(int, nf_ref) + __field(int, ret) + __field(unsigned long, nf_flags) + __field(unsigned char, nf_may) + __field(struct file *, nf_file) + ), + TP_fast_assign( + __entry->nf_inode = nf->nf_inode; + __entry->nf_ref = refcount_read(&nf->nf_ref); + __entry->ret = ret; + __entry->nf_flags = nf->nf_flags; + __entry->nf_may = nf->nf_may; + __entry->nf_file = nf->nf_file; + ), + TP_printk("inode=%p ref=%d flags=%s may=%s nf_file=%p ret=%d", + __entry->nf_inode, + __entry->nf_ref, + show_nf_flags(__entry->nf_flags), + show_nfsd_may_flags(__entry->nf_may), + __entry->nf_file, __entry->ret + ) +); + #include "cache.h"
TRACE_DEFINE_ENUM(RC_DROPIT);