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GET /api/1.1/patches/2231746/?format=api
{ "id": 2231746, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2231746/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260501112023.338005-15-sprasad@microsoft.com/", "project": { "id": 12, "url": "http://patchwork.ozlabs.org/api/1.1/projects/12/?format=api", "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": "<20260501112023.338005-15-sprasad@microsoft.com>", "date": "2026-05-01T11:20:18", "name": "[v4,15/19] cifs: allow dcache population to happen asynchronously", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "3879ac026b7dfb70e0a2c3c0a7041408ecdf7ef7", "submitter": { "id": 79368, "url": "http://patchwork.ozlabs.org/api/1.1/people/79368/?format=api", "name": "Shyam Prasad N", "email": "nspmangalore@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260501112023.338005-15-sprasad@microsoft.com/mbox/", "series": [ { "id": 502444, "url": "http://patchwork.ozlabs.org/api/1.1/series/502444/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-cifs-client/list/?series=502444", "date": "2026-05-01T11:20:06", "name": "[v4,01/19] cifs: change_conf needs to be called for session setup", "version": 4, "mbox": "http://patchwork.ozlabs.org/series/502444/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2231746/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2231746/checks/", "tags": {}, "headers": { "Return-Path": "\n <linux-cifs+bounces-11340-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 (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=pFrnLPzD;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c09:e001:a7::12fc:5321; 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This introduces a perf bottleneck in\nreaddir performance.\n\nThis change attempts to make dcache population asynchronous\nand parallel by doing this inside workers. It introduces a new\nflag that lets reval and lookup wait for dentry population instead.\n\nSigned-off-by: Shyam Prasad N <sprasad@microsoft.com>\n---\n fs/smb/client/cifs_fs_sb.h | 1 +\n fs/smb/client/cifsfs.c | 22 +++++++++-\n fs/smb/client/cifsglob.h | 2 +\n fs/smb/client/readdir.c | 88 +++++++++++++++++++++++++++++++++++++-\n 4 files changed, 110 insertions(+), 3 deletions(-)", "diff": "diff --git a/fs/smb/client/cifs_fs_sb.h b/fs/smb/client/cifs_fs_sb.h\nindex 84e7e366b0ff4..0efc1483f3ab4 100644\n--- a/fs/smb/client/cifs_fs_sb.h\n+++ b/fs/smb/client/cifs_fs_sb.h\n@@ -71,5 +71,6 @@ struct cifs_sb_info {\n \t * Available once the mount has completed.\n \t */\n \tstruct dentry *root;\n+\tbool sb_dying:1; /* superblock is being destroyed, skip dcache ops */\n };\n #endif\t\t\t\t/* _CIFS_FS_SB_H */\ndiff --git a/fs/smb/client/cifsfs.c b/fs/smb/client/cifsfs.c\nindex 79a6a4c297ee3..f8f3b27ba60bc 100644\n--- a/fs/smb/client/cifsfs.c\n+++ b/fs/smb/client/cifsfs.c\n@@ -69,6 +69,7 @@ bool disable_legacy_dialects; /* false by default */\n bool enable_gcm_256 = true;\n bool require_gcm_256; /* false by default */\n bool enable_negotiate_signing; /* false by default */\n+bool dcache_populate_async; /* false by default */\n unsigned int global_secflags = CIFSSEC_DEF;\n /* unsigned int ntlmv2_support = 0; */\n \n@@ -241,6 +242,9 @@ MODULE_PARM_DESC(require_gcm_256, \"Require strongest (256 bit) GCM encryption. D\n module_param(enable_negotiate_signing, bool, 0644);\n MODULE_PARM_DESC(enable_negotiate_signing, \"Enable negotiating packet signing algorithm with server. Default: n/N/0\");\n \n+module_param(dcache_populate_async, bool, 0644);\n+MODULE_PARM_DESC(dcache_populate_async, \"Enable asynchronous dcache population during readdir to improve performance on large directories. Default: n/N/0\");\n+\n module_param(disable_legacy_dialects, bool, 0644);\n MODULE_PARM_DESC(disable_legacy_dialects, \"To improve security it may be \"\n \t\t\t\t \"helpful to restrict the ability to \"\n@@ -395,6 +399,11 @@ static void cifs_kill_sb(struct super_block *sb)\n \t * and close all deferred file handles before we kill the sb.\n \t */\n \tif (cifs_sb->root) {\n+\t\t/* Mark superblock as dying to skip expensive dcache ops in flight */\n+\t\tcifs_sb->sb_dying = true;\n+\t\t/* Wait for dcache work to complete and clean up */\n+\t\tflush_workqueue(cifs_dcache_wq);\n+\n \t\tclose_all_cached_dirs(cifs_sb);\n \t\tcifs_close_all_deferred_files_sb(cifs_sb);\n \n@@ -2082,9 +2091,17 @@ init_cifs(void)\n \t\tgoto out_destroy_serverclose_wq;\n \t}\n \n+\t/* WQ_UNBOUND allows dcache work to run on any CPU for parallelism */\n+\tcifs_dcache_wq = alloc_workqueue(\"cifs_dcache\",\n+\t\t\t\t\t WQ_UNBOUND | WQ_FREEZABLE, 0);\n+\tif (!cifs_dcache_wq) {\n+\t\trc = -ENOMEM;\n+\t\tgoto out_destroy_cfid_put_wq;\n+\t}\n+\n \trc = cifs_init_inodecache();\n \tif (rc)\n-\t\tgoto out_destroy_cfid_put_wq;\n+\t\tgoto out_destroy_dcache_wq;\n \n \trc = cifs_init_netfs();\n \tif (rc)\n@@ -2164,6 +2181,8 @@ init_cifs(void)\n \tcifs_destroy_netfs();\n out_destroy_inodecache:\n \tcifs_destroy_inodecache();\n+out_destroy_dcache_wq:\n+\tdestroy_workqueue(cifs_dcache_wq);\n out_destroy_cfid_put_wq:\n \tdestroy_workqueue(cfid_put_wq);\n out_destroy_serverclose_wq:\n@@ -2212,6 +2231,7 @@ exit_cifs(void)\n \tdestroy_workqueue(fileinfo_put_wq);\n \tdestroy_workqueue(serverclose_wq);\n \tdestroy_workqueue(cfid_put_wq);\n+\tdestroy_workqueue(cifs_dcache_wq);\n \tdestroy_workqueue(cifsiod_wq);\n \tcifs_proc_clean();\n }\ndiff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h\nindex 2a3fad071564a..278bf2bf11e97 100644\n--- a/fs/smb/client/cifsglob.h\n+++ b/fs/smb/client/cifsglob.h\n@@ -2144,6 +2144,7 @@ extern unsigned int sign_CIFS_PDUs; /* enable smb packet signing */\n extern bool enable_gcm_256; /* allow optional negotiate of strongest signing (aes-gcm-256) */\n extern bool require_gcm_256; /* require use of strongest signing (aes-gcm-256) */\n extern bool enable_negotiate_signing; /* request use of faster (GMAC) signing if available */\n+extern bool dcache_populate_async; /* enable async dcache population during readdir */\n extern bool linuxExtEnabled;/*enable Linux/Unix CIFS extensions*/\n extern unsigned int CIFSMaxBufSize; /* max size not including hdr */\n extern unsigned int cifs_min_rcv; /* min size of big ntwrk buf pool */\n@@ -2165,6 +2166,7 @@ extern struct workqueue_struct *cifsoplockd_wq;\n extern struct workqueue_struct *deferredclose_wq;\n extern struct workqueue_struct *serverclose_wq;\n extern struct workqueue_struct *cfid_put_wq;\n+extern struct workqueue_struct *cifs_dcache_wq;\n extern __u32 cifs_lock_secret;\n \n extern mempool_t *cifs_sm_req_poolp;\ndiff --git a/fs/smb/client/readdir.c b/fs/smb/client/readdir.c\nindex ef81fdb503c0a..a1202a82be4e8 100644\n--- a/fs/smb/client/readdir.c\n+++ b/fs/smb/client/readdir.c\n@@ -13,6 +13,7 @@\n #include <linux/pagemap.h>\n #include <linux/slab.h>\n #include <linux/stat.h>\n+#include <linux/workqueue.h>\n #include \"cifsglob.h\"\n #include \"cifsproto.h\"\n #include \"cifs_unicode.h\"\n@@ -24,6 +25,19 @@\n #include \"cached_dir.h\"\n #include \"reparse.h\"\n \n+/* Workqueue for async dcache population */\n+struct workqueue_struct *cifs_dcache_wq;\n+\n+/* Work item for async dcache population */\n+struct cifs_dcache_work {\n+\tstruct work_struct work;\n+\tstruct dentry *parent;\t\t/* dget() reference to parent dir */\n+\tchar *name;\t\t\t/* kstrdup() copy of filename */\n+\tunsigned int namelen;\n+\tstruct cifs_fattr fattr;\t/* Copy of attributes */\n+\tstruct cached_fid *cfid;\t/* ref-counted cfid for cifs_complete_pending_dcache */\n+};\n+\n /*\n * To be safe - for UCS to UTF-8 with strings loaded with the rare long\n * characters alloc more to account for such multibyte target UTF-8\n@@ -171,6 +185,65 @@ cifs_prime_dcache(struct dentry *parent, struct qstr *name,\n \tdput(dentry);\n }\n \n+/*\n+ * Async dcache population work handler.\n+ * Delegates to cifs_prime_dcache then signals completion to unblock waiters.\n+ */\n+static void cifs_dcache_work_handler(struct work_struct *work)\n+{\n+\tstruct cifs_dcache_work *dcache_work =\n+\t\tcontainer_of(work, struct cifs_dcache_work, work);\n+\tstruct qstr name = QSTR_INIT(dcache_work->name, dcache_work->namelen);\n+\tstruct cifs_sb_info *cifs_sb = CIFS_SB(dcache_work->parent->d_sb);\n+\n+\tcifs_dbg(FYI, \"%s: async dcache for %s\\n\", __func__, name.name);\n+\n+\t/* Skip expensive dcache operations if superblock is being torn down */\n+\tif (!cifs_sb->sb_dying) {\n+\t\tcifs_prime_dcache(dcache_work->parent, &name, &dcache_work->fattr);\n+\t\tcifs_complete_pending_dcache(dcache_work->cfid, dcache_work->name,\n+\t\t\t\t\t dcache_work->namelen);\n+\t}\n+\tclose_cached_dir(dcache_work->cfid);\n+\tdput(dcache_work->parent);\n+\tkfree(dcache_work->name);\n+\tkfree(dcache_work);\n+}\n+\n+/*\n+ * Queue async dcache population work.\n+ * Returns true if work was queued, false if sync fallback needed.\n+ */\n+static bool cifs_queue_dcache_work(struct dentry *parent, const char *name,\n+\t\t\t\t unsigned int namelen, struct cifs_fattr *fattr,\n+\t\t\t\t struct cached_fid *cfid)\n+{\n+\tstruct cifs_dcache_work *work;\n+\n+\tif (!cfid)\n+\t\treturn false;\n+\n+\twork = kzalloc(sizeof(*work), GFP_KERNEL);\n+\tif (!work)\n+\t\treturn false;\n+\n+\twork->name = kstrndup(name, namelen, GFP_KERNEL);\n+\tif (!work->name) {\n+\t\tkfree(work);\n+\t\treturn false;\n+\t}\n+\n+\twork->parent = dget(parent);\n+\twork->namelen = namelen;\n+\tmemcpy(&work->fattr, fattr, sizeof(work->fattr));\n+\tkref_get(&cfid->refcount);\n+\twork->cfid = cfid;\n+\n+\tINIT_WORK(&work->work, cifs_dcache_work_handler);\n+\tqueue_work(cifs_dcache_wq, &work->work);\n+\treturn true;\n+}\n+\n static void\n cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)\n {\n@@ -923,8 +996,19 @@ static int cifs_filldir(char *find_entry, struct file *file,\n \t\t */\n \t\tfattr.cf_flags |= CIFS_FATTR_NEED_REVAL;\n \n-\tadd_to_cached_dir(cfid, ctx, name.name, name.len, &fattr, file);\n-\tcifs_prime_dcache(file_dentry(file), &name, &fattr);\n+\t/* queue async dcache population if enabled; fallback to sync if disabled or queueing fails */\n+\tbool cached = add_to_cached_dir(cfid, ctx, name.name, name.len, &fattr, file);\n+\n+\tif (dcache_populate_async && cached &&\n+\t cifs_queue_dcache_work(file_dentry(file), name.name, name.len,\n+\t\t\t\t &fattr, cfid)) {\n+\t\t/* Async: handler will call cifs_prime_dcache + cifs_complete_pending_dcache */\n+\t\tcifs_dbg(FYI, \"Queued async dcache population for %.*s\\n\", name.len, name.name);\n+\t} else {\n+\t\tcifs_prime_dcache(file_dentry(file), &name, &fattr);\n+\t\tif (cached)\n+\t\t\tcifs_complete_pending_dcache(cfid, name.name, name.len);\n+\t}\n \n \treturn !cifs_dir_emit(ctx, name.name, name.len, &fattr);\n }\n", "prefixes": [ "v4", "15/19" ] }