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{
    "id": 2219176,
    "url": "http://patchwork.ozlabs.org/api/1.0/patches/2219176/?format=api",
    "project": {
        "id": 12,
        "url": "http://patchwork.ozlabs.org/api/1.0/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": "<20260402141839.461257-6-huiwen.he@linux.dev>",
    "date": "2026-04-02T14:18:31",
    "name": "[v3,05/13] smb/client: use binary search for NT status to DOS mapping",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "a569730464fb08cceb6206e98ec5d96a1c368c9e",
    "submitter": {
        "id": 93029,
        "url": "http://patchwork.ozlabs.org/api/1.0/people/93029/?format=api",
        "name": null,
        "email": "huiwen.he@linux.dev"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/linux-cifs-client/patch/20260402141839.461257-6-huiwen.he@linux.dev/mbox/",
    "series": [
        {
            "id": 498490,
            "url": "http://patchwork.ozlabs.org/api/1.0/series/498490/?format=api",
            "date": "2026-04-02T14:18:28",
            "name": "smb: improve search speed of SMB1 maperror",
            "version": 3,
            "mbox": "http://patchwork.ozlabs.org/series/498490/mbox/"
        }
    ],
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/2219176/checks/",
    "tags": {},
    "headers": {
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        "From": "huiwen.he@linux.dev",
        "To": "smfrench@gmail.com,\n\tlinkinjeon@kernel.org,\n\tdhowells@redhat.com,\n\tchenxiaosong@kylinos.cn,\n\tchenxiaosong@chenxiaosong.com,\n\ttangyouling@kylinos.cn",
        "Cc": "linux-cifs@vger.kernel.org,\n\tHuiwen He <hehuiwen@kylinos.cn>",
        "Subject": "[PATCH v3 05/13] smb/client: use binary search for NT status to DOS\n mapping",
        "Date": "Thu,  2 Apr 2026 14:18:31 +0000",
        "Message-ID": "<20260402141839.461257-6-huiwen.he@linux.dev>",
        "In-Reply-To": "<20260402141839.461257-1-huiwen.he@linux.dev>",
        "References": "<20260402141839.461257-1-huiwen.he@linux.dev>",
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        "X-Migadu-Flow": "FLOW_OUT"
    },
    "content": "From: Huiwen He <hehuiwen@kylinos.cn>\n\nThe ntstatus_to_dos_map[] table is sorted now. Replace the linear search\nwith binary search to improve lookup performance.\n\nAlso remove the sentinel entry as it is no longer needed with ARRAY_SIZE().\n\nSigned-off-by: Huiwen He <hehuiwen@kylinos.cn>\nReviewed-by: ChenXiaoSong <chenxiaosong@kylinos.cn>\n---\n fs/smb/client/smb1maperror.c | 32 +++++++++++++++++++-------------\n 1 file changed, 19 insertions(+), 13 deletions(-)",
    "diff": "diff --git a/fs/smb/client/smb1maperror.c b/fs/smb/client/smb1maperror.c\nindex c906f233ac64..fb985d2fc0d9 100644\n--- a/fs/smb/client/smb1maperror.c\n+++ b/fs/smb/client/smb1maperror.c\n@@ -106,6 +106,19 @@ static const struct smb_to_posix_error mapping_table_ERRSRV[] = {\n /*****************************************************************************\n  *convert a NT status code to a dos class/code\n  *****************************************************************************/\n+\n+static __always_inline int ntstatus_to_dos_cmp(const void *_key, const void *_pivot)\n+{\n+\t__u32 key = *(__u32 *)_key;\n+\tconst struct ntstatus_to_dos_err *pivot = _pivot;\n+\n+\tif (key < pivot->ntstatus)\n+\t\treturn -1;\n+\tif (key > pivot->ntstatus)\n+\t\treturn 1;\n+\treturn 0;\n+}\n+\n /* NT status -> dos error map */\n static const struct ntstatus_to_dos_err ntstatus_to_dos_map[] = {\n /*\n@@ -113,22 +126,15 @@ static const struct ntstatus_to_dos_err ntstatus_to_dos_map[] = {\n  * sorted by NT status code (ascending).\n  */\n #include \"smb1_mapping_table.c\"\n-\t{0, 0, 0, NULL}\n };\n \n static const struct ntstatus_to_dos_err *\n-ntstatus_to_dos(__u32 ntstatus)\n+search_ntstatus_to_dos_map(__u32 ntstatus)\n {\n-\tint i;\n-\n-\t/* Check nt_errstr to allow mapping of NT_STATUS_OK (0) */\n-\tfor (i = 0; ntstatus_to_dos_map[i].nt_errstr; i++) {\n-\t\tif (ntstatus == ntstatus_to_dos_map[i].ntstatus) {\n-\t\t\treturn &ntstatus_to_dos_map[i];\n-\t\t}\n-\t}\n-\n-\treturn NULL;\n+\treturn __inline_bsearch(&ntstatus, ntstatus_to_dos_map,\n+\t\t\t\tARRAY_SIZE(ntstatus_to_dos_map),\n+\t\t\t\tsizeof(struct ntstatus_to_dos_err),\n+\t\t\t\tntstatus_to_dos_cmp);\n }\n \n int\n@@ -150,7 +156,7 @@ map_smb_to_linux_error(char *buf, bool logErr)\n \t\t/* translate the newer STATUS codes to old style SMB errors\n \t\t * and then to POSIX errors */\n \t\t__u32 err = le32_to_cpu(smb->Status.CifsError);\n-\t\tconst struct ntstatus_to_dos_err *map = ntstatus_to_dos(err);\n+\t\tconst struct ntstatus_to_dos_err *map = search_ntstatus_to_dos_map(err);\n \n \t\tif (map) {\n \t\t\tif ((logErr && err != NT_STATUS_MORE_PROCESSING_REQUIRED) ||\n",
    "prefixes": [
        "v3",
        "05/13"
    ]
}