{"id":2229736,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2229736/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260428160804.281745-16-sprasad@microsoft.com/","project":{"id":12,"url":"http://patchwork.ozlabs.org/api/1.1/projects/12/?format=json","name":"Linux CIFS Client","link_name":"linux-cifs-client","list_id":"linux-cifs.vger.kernel.org","list_email":"linux-cifs@vger.kernel.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20260428160804.281745-16-sprasad@microsoft.com>","date":"2026-04-28T16:08:01","name":"[v3,16/19] cifs: trace points for cached_dir operations","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"a76cfca1ea5838df8f488c8ce7849a90792f1550","submitter":{"id":79368,"url":"http://patchwork.ozlabs.org/api/1.1/people/79368/?format=json","name":"Shyam Prasad N","email":"nspmangalore@gmail.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260428160804.281745-16-sprasad@microsoft.com/mbox/","series":[{"id":501896,"url":"http://patchwork.ozlabs.org/api/1.1/series/501896/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-cifs-client/list/?series=501896","date":"2026-04-28T16:07:57","name":"[v3,01/19] cifs: change_conf needs to be called for session setup","version":3,"mbox":"http://patchwork.ozlabs.org/series/501896/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2229736/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2229736/checks/","tags":{},"headers":{"Return-Path":"\n <linux-cifs+bounces-11253-incoming=patchwork.ozlabs.org@vger.kernel.org>","X-Original-To":["incoming@patchwork.ozlabs.org","linux-cifs@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass 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(PDT)","From":"nspmangalore@gmail.com","X-Google-Original-From":"sprasad@microsoft.com","To":"linux-cifs@vger.kernel.org,\n\tsmfrench@gmail.com,\n\tpc@manguebit.org,\n\tbharathsm@microsoft.com,\n\tdhowells@redhat.com,\n\thenrique.carvalho@suse.com,\n\tematsumiya@suse.de","Cc":"Shyam Prasad N <sprasad@microsoft.com>","Subject":"[PATCH v3 16/19] cifs: trace points for cached_dir operations","Date":"Tue, 28 Apr 2026 21:38:01 +0530","Message-ID":"<20260428160804.281745-16-sprasad@microsoft.com>","X-Mailer":"git-send-email 2.43.0","In-Reply-To":"<20260428160804.281745-1-sprasad@microsoft.com>","References":"<20260428160804.281745-1-sprasad@microsoft.com>","Precedence":"bulk","X-Mailing-List":"linux-cifs@vger.kernel.org","List-Id":"<linux-cifs.vger.kernel.org>","List-Subscribe":"<mailto:linux-cifs+subscribe@vger.kernel.org>","List-Unsubscribe":"<mailto:linux-cifs+unsubscribe@vger.kernel.org>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit"},"content":"From: Shyam Prasad N <sprasad@microsoft.com>\n\nThis change introduces ftrace tracepoints for cached_dir operations.\nIntended to be used for debugging cached_dir.\n\nSigned-off-by: Shyam Prasad N <sprasad@microsoft.com>\n---\n fs/smb/client/cached_dir.c | 21 ++++++++++-\n fs/smb/client/inode.c      | 13 +++++++\n fs/smb/client/trace.h      | 73 ++++++++++++++++++++++++++++++++++++++\n 3 files changed, 106 insertions(+), 1 deletion(-)","diff":"diff --git a/fs/smb/client/cached_dir.c b/fs/smb/client/cached_dir.c\nindex 863b8d666ea95..6fb88c4c97dc1 100644\n--- a/fs/smb/client/cached_dir.c\n+++ b/fs/smb/client/cached_dir.c\n@@ -1011,6 +1011,7 @@ bool add_to_cached_dir(struct cached_fid *cfid,\n \t\tatomic64_sub(-bytes_diff, &cfid->cfids->total_dirents_bytes);\n \t\tatomic64_sub(-bytes_diff, &cifs_dircache_bytes_used);\n \t}\n+\ttrace_smb3_add_to_cached_dir(cfid, name, namelen, added ? 0 : -1);\n \n \n \treturn added;\n@@ -1041,6 +1042,9 @@ void complete_cached_dir(struct cached_fid *cfid,\n \tcde = &cfid->dirents;\n \tmutex_lock(&cfid->dirents.de_mutex);\n \tfinished_cached_dirents_count(cde, ctx, file);\n+\ttrace_smb3_complete_cached_dir(cfid, ctx->pos, cde->pos,\n+\t\t\t\t\t cde->is_valid,\n+\t\t\t\t\t cde->is_failed);\n \tmutex_unlock(&cfid->dirents.de_mutex);\n }\n \n@@ -1076,12 +1080,14 @@ int lookup_cached_dir(struct cached_fid *cfid,\n \tentry = lookup_cached_dirent_entry_locked(&cfid->dirents, name, namelen);\n \tif (!entry || !entry->dirent) {\n \t\tmutex_unlock(&cfid->dirents.de_mutex);\n+\t\ttrace_smb3_lookup_cached_dir(cfid, name, namelen, -ENOENT);\n \t\treturn -ENOENT;\n \t}\n \n \tdirent = entry->dirent;\n \tif (dirent->tombstone) {\n \t\tmutex_unlock(&cfid->dirents.de_mutex);\n+\t\ttrace_smb3_lookup_cached_dir(cfid, name, namelen, -ENOENT);\n \t\treturn -ENOENT;\n \t}\n \n@@ -1089,6 +1095,7 @@ int lookup_cached_dir(struct cached_fid *cfid,\n \tmemcpy(&result->fattr, &dirent->fattr, sizeof(result->fattr));\n \n \tmutex_unlock(&cfid->dirents.de_mutex);\n+\ttrace_smb3_lookup_cached_dir(cfid, name, namelen, 0);\n \treturn 0;\n }\n \n@@ -1126,6 +1133,8 @@ bool update_dirent_in_cached_dir(struct cached_fid *cfid,\n \tupdated = update_cached_dirent_locked(&cfid->dirents, name,\n \t\t\t\t\t\t      namelen, fattr);\n \tmutex_unlock(&cfid->dirents.de_mutex);\n+\ttrace_smb3_update_dirent_in_cached_dir(cfid, name, namelen,\n+\t\t\t\t\t      updated ? 0 : -ENOENT);\n \treturn updated;\n }\n \n@@ -1185,6 +1194,7 @@ void cifs_complete_pending_dcache(struct cached_fid *cfid,\n \tmutex_unlock(&cfid->dirents.de_mutex);\n \tcifs_dbg(FYI, \"Dcache population of %.*s. status: %d\\n\",\n \t\t\t\t\tnamelen, name, ret);\n+\ttrace_smb3_dcache_complete(cfid, name, namelen, ret);\n }\n \n /*\n@@ -1226,6 +1236,7 @@ int cifs_wait_for_pending_dcache(struct cached_fid *cfid,\n \t\t}\n \t}\n \n+\ttrace_smb3_dcache_wait(cfid, name, namelen, ret);\n \treturn ret;\n }\n \n@@ -1399,6 +1410,7 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,\n \tif (cfid == NULL) {\n \t\tspin_unlock(&cfids->cfid_list_lock);\n \t\tkfree(utf16_path);\n+\t\ttrace_smb3_open_cached_dir(NULL, path, strlen(path), -ENOENT);\n \t\treturn -ENOENT;\n \t}\n \tspin_unlock(&cfids->cfid_list_lock);\n@@ -1637,6 +1649,7 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,\n \t\t*ret_cfid = cfid;\n \t\tatomic_inc(&tcon->num_remote_opens);\n \t}\n+\ttrace_smb3_open_cached_dir(cfid, path, strlen(path), rc);\n \tkfree(utf16_path);\n \n \tif (is_replayable_error(rc) &&\n@@ -1651,7 +1664,6 @@ int open_cached_dir_by_dentry(struct cifs_tcon *tcon,\n \t\t\t      struct cached_fid **ret_cfid)\n {\n \tstruct cached_fid *cfid;\n-\tstruct cached_fid *trace_cfid = NULL;\n \tstruct cached_fids *cfids = tcon->cfids;\n \tint rc = -ENOENT;\n \n@@ -1667,6 +1679,7 @@ int open_cached_dir_by_dentry(struct cifs_tcon *tcon,\n \t\t\tspin_lock(&cfid->cfid_lock);\n \t\t\tif (!is_valid_cached_dir(cfid)) {\n \t\t\t\tspin_unlock(&cfid->cfid_lock);\n+\t\t\t\trc = -ENOENT;\n \t\t\t\tbreak;\n \t\t\t}\n \t\t\tcifs_dbg(FYI, \"found a cached file handle by dentry\\n\");\n@@ -1677,10 +1690,15 @@ int open_cached_dir_by_dentry(struct cifs_tcon *tcon,\n \t\t\ttrace_cfid = cfid;\n \t\t\tspin_unlock(&cfid->cfid_lock);\n \t\t\tspin_unlock(&cfids->cfid_list_lock);\n+\t\t\ttrace_smb3_open_cached_dir_by_dentry(cfid, dentry->d_name.name,\n+\t\t\t\t\t\t\t dentry->d_name.len, 0);\n \t\t\treturn rc;\n \t\t}\n \t}\n \tspin_unlock(&cfids->cfid_list_lock);\n+\ttrace_smb3_open_cached_dir_by_dentry(NULL, dentry->d_name.name,\n+\t\t\t\t\t     dentry->d_name.len, rc);\n+\n \treturn rc;\n }\n \n@@ -1982,6 +2000,7 @@ static void free_cached_dir(struct cached_fid *cfid)\n \n \tWARN_ON(work_pending(&cfid->close_work));\n \tWARN_ON(work_pending(&cfid->put_work));\n+\ttrace_smb3_free_cached_dir(cfid, cfid->path, strlen(cfid->path), 0);\n \n \n \tdput(cfid->dentry);\ndiff --git a/fs/smb/client/inode.c b/fs/smb/client/inode.c\nindex f03371abcfef9..75f9f29d303f2 100644\n--- a/fs/smb/client/inode.c\n+++ b/fs/smb/client/inode.c\n@@ -2865,20 +2865,31 @@ cifs_dentry_needs_reval(struct dentry *dentry)\n \t\t\tif (!rc && lookup.found && lookup.under_active_lease) {\n \t\t\t\tif (cifs_inode_has_writable_handle(inode)) {\n \t\t\t\t\tcifs_set_time(dentry, jiffies);\n+\t\t\t\t\ttrace_smb3_dcache_revalidate(cfid,\n+\t\t\t\t\t\t\t dentry->d_name.name,\n+\t\t\t\t\t\t\t     dentry->d_name.len, 0);\n \t\t\t\t\tcifs_put_tlink(tlink);\n \t\t\t\t\treturn false;\n \t\t\t\t}\n \t\t\t\trc = cifs_fattr_to_inode(inode, &lookup.fattr, false);\n \t\t\t\tif (!rc) {\n \t\t\t\t\tcifs_set_time(dentry, jiffies);\n+\t\t\t\t\ttrace_smb3_dcache_revalidate(cfid,\n+\t\t\t\t\t\t\t dentry->d_name.name,\n+\t\t\t\t\t\t\t     dentry->d_name.len, 0);\n \t\t\t\t\tcifs_put_tlink(tlink);\n \t\t\t\t\treturn false;\n \t\t\t\t}\n \t\t\t\tif (rc != -ESTALE) {\n+\t\t\t\t\ttrace_smb3_dcache_revalidate(cfid,\n+\t\t\t\t\t\t\t dentry->d_name.name,\n+\t\t\t\t\t\t\t     dentry->d_name.len, rc);\n \t\t\t\t\tcifs_put_tlink(tlink);\n \t\t\t\t\treturn true;\n \t\t\t\t}\n \t\t\t}\n+\t\t\ttrace_smb3_dcache_revalidate(cfid, dentry->d_name.name,\n+\t\t\t\t\t\t     dentry->d_name.len, rc);\n \t\t}\n \t}\n \n@@ -2888,6 +2899,8 @@ cifs_dentry_needs_reval(struct dentry *dentry)\n \t * cache lookup/update did not satisfy this dentry.\n \t */\n \tif (force_reval) {\n+\t\ttrace_smb3_dcache_revalidate(cfid, dentry->d_name.name,\n+\t\t\t\t\t     dentry->d_name.len, -1);\n \t\tcifs_put_tlink(tlink);\n \t\treturn true;\n \t}\ndiff --git a/fs/smb/client/trace.h b/fs/smb/client/trace.h\nindex 54ee1317c5b12..9907a89ee4001 100644\n--- a/fs/smb/client/trace.h\n+++ b/fs/smb/client/trace.h\n@@ -1813,6 +1813,79 @@ TRACE_EVENT(smb3_eio,\n \t\t      __entry->info, __entry->info2)\n \t    );\n \n+/*\n+ * Trace events for async directory cache population work\n+ */\n+DECLARE_EVENT_CLASS(smb3_dcache,\n+\tTP_PROTO(const void *cfid,\n+\t\tconst char *name,\n+\t\tint namelen,\n+\t\tint result),\n+\tTP_ARGS(cfid, name, namelen, result),\n+\tTP_STRUCT__entry(\n+\t\t__field(const void *, cfid)\n+\t\t__string(name, name)\n+\t\t__field(int, namelen)\n+\t\t__field(int, result)\n+\t),\n+\tTP_fast_assign(\n+\t\t__entry->cfid = cfid;\n+\t\t__assign_str(name);\n+\t\t__entry->namelen = namelen;\n+\t\t__entry->result = result;\n+\t),\n+\tTP_printk(\"cfid=%p name=%.*s result=%d\",\n+\t\t__entry->cfid,\n+\t\t__entry->namelen, __get_str(name), __entry->result)\n+);\n+\n+#define DEFINE_SMB3_DCACHE_EVENT(name)          \\\n+DEFINE_EVENT(smb3_dcache, smb3_##name,    \\\n+\tTP_PROTO(const void *cfid,\t\t\\\n+\t\tconst char *name,\t\t\\\n+\t\tint namelen,\t\t\t\\\n+\t\tint result),\t\t\t\\\n+\tTP_ARGS(cfid, name, namelen, result))\n+\n+DEFINE_SMB3_DCACHE_EVENT(dcache_complete);\n+DEFINE_SMB3_DCACHE_EVENT(dcache_wait);\n+DEFINE_SMB3_DCACHE_EVENT(dcache_revalidate);\n+DEFINE_SMB3_DCACHE_EVENT(open_cached_dir);\n+DEFINE_SMB3_DCACHE_EVENT(open_cached_dir_by_dentry);\n+DEFINE_SMB3_DCACHE_EVENT(free_cached_dir);\n+DEFINE_SMB3_DCACHE_EVENT(add_to_cached_dir);\n+DEFINE_SMB3_DCACHE_EVENT(lookup_cached_dir);\n+DEFINE_SMB3_DCACHE_EVENT(update_dirent_in_cached_dir);\n+\n+TRACE_EVENT(smb3_complete_cached_dir,\n+\tTP_PROTO(const void *cfid,\n+\t\t loff_t ctx_pos,\n+\t\t loff_t cached_pos,\n+\t\t int is_valid,\n+\t\t int is_failed),\n+\tTP_ARGS(cfid, ctx_pos, cached_pos, is_valid, is_failed),\n+\tTP_STRUCT__entry(\n+\t\t__field(const void *, cfid)\n+\t\t__field(loff_t, ctx_pos)\n+\t\t__field(loff_t, cached_pos)\n+\t\t__field(int, is_valid)\n+\t\t__field(int, is_failed)\n+\t),\n+\tTP_fast_assign(\n+\t\t__entry->cfid = cfid;\n+\t\t__entry->ctx_pos = ctx_pos;\n+\t\t__entry->cached_pos = cached_pos;\n+\t\t__entry->is_valid = is_valid;\n+\t\t__entry->is_failed = is_failed;\n+\t),\n+\tTP_printk(\"cfid=%p ctx_pos=%lld cached_pos=%lld is_valid=%d is_failed=%d\",\n+\t\t__entry->cfid,\n+\t\t(long long)__entry->ctx_pos,\n+\t\t(long long)__entry->cached_pos,\n+\t\t__entry->is_valid,\n+\t\t__entry->is_failed)\n+);\n+\n #undef EM\n #undef E_\n #endif /* _CIFS_TRACE_H */\n","prefixes":["v3","16/19"]}