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smb: client: add tracepoints for deferred handle caching 

Add tracepoints to observe handle caching behavior.

smb3_open_cached: emitted when an open reuses a cached handle from
a previous deferred close, avoiding a network round-trip

smb3_close_cached: emitted when a close is deferred (handle cached
for potential reuse by subsequent opens)

Signed-off-by: Bharath SM <bharathsm@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
master
Bharath SM 2026-04-14 21:48:05 +05:30 committed by Steve French
parent 4c46b677f3
commit abce65948c
2 changed files with 59 additions and 0 deletions
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8
fs/smb/client/file.c
View File

@ -1083,6 +1083,9 @@ int cifs_open(struct inode *inode, struct file *file)
rc = cfile ? 0 : -ENOENT;
}
if (rc == 0) {
trace_smb3_open_cached(xid, tcon->tid, tcon->ses->Suid,
cfile->fid.persistent_fid,
file->f_flags, cfile->f_flags);
file->private_data = cfile;
spin_lock(&CIFS_I(inode)->deferred_lock);
cifs_del_deferred_close(cfile);
@ -1442,6 +1445,7 @@ int cifs_close(struct inode *inode, struct file *file)
struct cifsInodeInfo *cinode = CIFS_I(inode);
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifs_deferred_close *dclose;
struct cifs_tcon *tcon;
cifs_fscache_unuse_inode_cookie(inode, file->f_mode & FMODE_WRITE);
@ -1468,6 +1472,10 @@ int cifs_close(struct inode *inode, struct file *file)
cifsFileInfo_get(cfile);
} else {
/* Deferred close for files */
tcon = tlink_tcon(cfile->tlink);
trace_smb3_close_cached(tcon->tid, tcon->ses->Suid,
cfile->fid.persistent_fid,
cifs_sb->ctx->closetimeo);
queue_delayed_work(deferredclose_wq,
&cfile->deferred, cifs_sb->ctx->closetimeo);
cfile->deferred_close_scheduled = true;

51
fs/smb/client/trace.h
View File

@ -1361,6 +1361,57 @@ DEFINE_EVENT(smb3_open_done_class, smb3_##name, \
DEFINE_SMB3_OPEN_DONE_EVENT(open_done);
DEFINE_SMB3_OPEN_DONE_EVENT(posix_mkdir_done);
TRACE_EVENT(smb3_open_cached,
TP_PROTO(unsigned int xid,
__u32 tid,
__u64 sesid,
__u64 fid,
unsigned int oflags,
unsigned int cflags),
TP_ARGS(xid, tid, sesid, fid, oflags, cflags),
TP_STRUCT__entry(
__field(unsigned int, xid)
__field(__u32, tid)
__field(__u64, sesid)
__field(__u64, fid)
__field(unsigned int, oflags)
__field(unsigned int, cflags)
),
TP_fast_assign(
__entry->xid = xid;
__entry->tid = tid;
__entry->sesid = sesid;
__entry->fid = fid;
__entry->oflags = oflags;
__entry->cflags = cflags;
),
TP_printk("xid=%u sid=0x%llx tid=0x%x fid=0x%llx oflags=0x%x cflags=0x%x",
__entry->xid, __entry->sesid, __entry->tid, __entry->fid,
__entry->oflags, __entry->cflags)
);
TRACE_EVENT(smb3_close_cached,
TP_PROTO(__u32 tid,
__u64 sesid,
__u64 fid,
unsigned long delay_jiffies),
TP_ARGS(tid, sesid, fid, delay_jiffies),
TP_STRUCT__entry(
__field(__u32, tid)
__field(__u64, sesid)
__field(__u64, fid)
__field(unsigned long, delay_jiffies)
),
TP_fast_assign(
__entry->tid = tid;
__entry->sesid = sesid;
__entry->fid = fid;
__entry->delay_jiffies = delay_jiffies;
),
TP_printk("sid=0x%llx tid=0x%x fid=0x%llx delay_jiffies=%lu",
__entry->sesid, __entry->tid, __entry->fid, __entry->delay_jiffies)
);
DECLARE_EVENT_CLASS(smb3_lease_done_class,
TP_PROTO(__u32 lease_state,