Re: [PATCH v4 15/24] smb: move FILE_SYSTEM_POSIX_INFO to common/smb1pdu.h

Steve French
2025-10-31T01:53:17Z

Ralph,
Is this link current? or do you have the link to a more current
version of the POSIX extensions documentation?

On Thu, Oct 30, 2025 at 8:42 PM ChenXiaoSong
<chenxiaosong.chenxiaosong@linux.dev> wrote:
>
> Hi Namjae and Steve,
>
> I couldn’t find the definition of FILE_SYSTEM_POSIX_INFO in any of the
> following MS documents:
>
> - MS-FSCC:
> https://learn.microsoft.com/pdf?url=https%3A%2F%2Flearn.microsoft.com%2Fen-us%2Fopenspecs%2Fwindows_protocols%2Fms-fscc%2Ftoc.json
> - MS-CIFS:
> https://learn.microsoft.com/pdf?url=https%3A%2F%2Flearn.microsoft.com%2Fen-us%2Fopenspecs%2Fwindows_protocols%2Fms-cifs%2Ftoc.json
> - MS-SMB:
> https://learn.microsoft.com/pdf?url=https%3A%2F%2Flearn.microsoft.com%2Fen-us%2Fopenspecs%2Fwindows_protocols%2Fms-smb%2Ftoc.json
> - MS-SMB2:
> https://learn.microsoft.com/pdf?url=https%3A%2F%2Flearn.microsoft.com%2Fen-us%2Fopenspecs%2Fwindows_protocols%2Fms-smb2%2Ftoc.json
>
> Is this structure defined in other MS document?
>
> On 10/27/25 3:21 PM, chenxiaosong.chenxiaosong@linux.dev wrote:
> > From: ChenXiaoSong <chenxiaosong@kylinos.cn>
> >
> > Rename "struct filesystem_posix_info" to "FILE_SYSTEM_POSIX_INFO",
> > then move duplicate definitions to common header file.
> >
> > Signed-off-by: ChenXiaoSong <chenxiaosong@kylinos.cn>
> > ---
> > fs/smb/client/cifspdu.h | 22 ----------------------
> > fs/smb/common/smb1pdu.h | 23 +++++++++++++++++++++++
> > fs/smb/server/smb2pdu.c | 4 ++--
> > fs/smb/server/smb_common.h | 23 -----------------------
> > 4 files changed, 25 insertions(+), 47 deletions(-)
> >
> > diff --git a/fs/smb/client/cifspdu.h b/fs/smb/client/cifspdu.h
> > index d106c6850807..55aaae6dbc86 100644
> > --- a/fs/smb/client/cifspdu.h
> > +++ b/fs/smb/client/cifspdu.h
> > @@ -1875,28 +1875,6 @@ typedef struct {
> >
> > #define CIFS_POSIX_EXTENSIONS 0x00000010 /* support for new QFSInfo */
> >
> > -typedef struct {
> > - /* For undefined recommended transfer size return -1 in that field */
> > - __le32 OptimalTransferSize; /* bsize on some os, iosize on other os */
> > - __le32 BlockSize;
> > - /* The next three fields are in terms of the block size.
> > - (above). If block size is unknown, 4096 would be a
> > - reasonable block size for a server to report.
> > - Note that returning the blocks/blocksavail removes need
> > - to make a second call (to QFSInfo level 0x103 to get this info.
> > - UserBlockAvail is typically less than or equal to BlocksAvail,
> > - if no distinction is made return the same value in each */
> > - __le64 TotalBlocks;
> > - __le64 BlocksAvail; /* bfree */
> > - __le64 UserBlocksAvail; /* bavail */
> > - /* For undefined Node fields or FSID return -1 */
> > - __le64 TotalFileNodes;
> > - __le64 FreeFileNodes;
> > - __le64 FileSysIdentifier; /* fsid */
> > - /* NB Namelen comes from FILE_SYSTEM_ATTRIBUTE_INFO call */
> > - /* NB flags can come from FILE_SYSTEM_DEVICE_INFO call */
> > -} __attribute__((packed)) FILE_SYSTEM_POSIX_INFO;
> > -
> > /* DeviceType Flags */
> > #define FILE_DEVICE_CD_ROM 0x00000002
> > #define FILE_DEVICE_CD_ROM_FILE_SYSTEM 0x00000003
> > diff --git a/fs/smb/common/smb1pdu.h b/fs/smb/common/smb1pdu.h
> > index 82331a8f70e8..38b9c091baab 100644
> > --- a/fs/smb/common/smb1pdu.h
> > +++ b/fs/smb/common/smb1pdu.h
> > @@ -327,6 +327,29 @@ typedef struct {
> > __le32 BytesPerSector;
> > } __packed FILE_SYSTEM_INFO; /* size info, level 0x103 */
> >
> > +typedef struct {
> > + /* For undefined recommended transfer size return -1 in that field */
> > + __le32 OptimalTransferSize; /* bsize on some os, iosize on other os */
> > + __le32 BlockSize;
> > + /* The next three fields are in terms of the block size.
> > + * (above). If block size is unknown, 4096 would be a
> > + * reasonable block size for a server to report.
> > + * Note that returning the blocks/blocksavail removes need
> > + * to make a second call (to QFSInfo level 0x103 to get this info.
> > + * UserBlockAvail is typically less than or equal to BlocksAvail,
> > + * if no distinction is made return the same value in each
> > + */
> > + __le64 TotalBlocks;
> > + __le64 BlocksAvail; /* bfree */
> > + __le64 UserBlocksAvail; /* bavail */
> > + /* For undefined Node fields or FSID return -1 */
> > + __le64 TotalFileNodes;
> > + __le64 FreeFileNodes;
> > + __le64 FileSysIdentifier; /* fsid */
> > + /* NB Namelen comes from FILE_SYSTEM_ATTRIBUTE_INFO call */
> > + /* NB flags can come from FILE_SYSTEM_DEVICE_INFO call */
> > +} __packed FILE_SYSTEM_POSIX_INFO;
> > +
> > /* See MS-CIFS 2.2.8.2.5 */
> > typedef struct {
> > __le32 DeviceType;
> > diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c
> > index 47fab72a3588..dc0f0ed4ccb6 100644
> > --- a/fs/smb/server/smb2pdu.c
> > +++ b/fs/smb/server/smb2pdu.c
> > @@ -5633,14 +5633,14 @@ static int smb2_get_info_filesystem(struct ksmbd_work *work,
> > }
> > case FS_POSIX_INFORMATION:
> > {
> > - struct filesystem_posix_info *info;
> > + FILE_SYSTEM_POSIX_INFO *info;
> >
> > if (!work->tcon->posix_extensions) {
> > pr_err("client doesn't negotiate with SMB3.1.1 POSIX Extensions\n");
> > path_put(&path);
> > return -EOPNOTSUPP;
> > } else {
> > - info = (struct filesystem_posix_info *)(rsp->Buffer);
> > + info = (FILE_SYSTEM_POSIX_INFO *)(rsp->Buffer);
> > info->OptimalTransferSize = cpu_to_le32(stfs.f_bsize);
> > info->BlockSize = cpu_to_le32(stfs.f_bsize);
> > info->TotalBlocks = cpu_to_le64(stfs.f_blocks);
> > diff --git a/fs/smb/server/smb_common.h b/fs/smb/server/smb_common.h
> > index 6141ca8f7e1c..61048568f4c7 100644
> > --- a/fs/smb/server/smb_common.h
> > +++ b/fs/smb/server/smb_common.h
> > @@ -108,29 +108,6 @@ struct file_id_both_directory_info {
> > char FileName[];
> > } __packed;
> >
> > -struct filesystem_posix_info {
> > - /* For undefined recommended transfer size return -1 in that field */
> > - __le32 OptimalTransferSize; /* bsize on some os, iosize on other os */
> > - __le32 BlockSize;
> > - /* The next three fields are in terms of the block size.
> > - * (above). If block size is unknown, 4096 would be a
> > - * reasonable block size for a server to report.
> > - * Note that returning the blocks/blocksavail removes need
> > - * to make a second call (to QFSInfo level 0x103 to get this info.
> > - * UserBlockAvail is typically less than or equal to BlocksAvail,
> > - * if no distinction is made return the same value in each
> > - */
> > - __le64 TotalBlocks;
> > - __le64 BlocksAvail; /* bfree */
> > - __le64 UserBlocksAvail; /* bavail */
> > - /* For undefined Node fields or FSID return -1 */
> > - __le64 TotalFileNodes;
> > - __le64 FreeFileNodes;
> > - __le64 FileSysIdentifier; /* fsid */
> > - /* NB Namelen comes from FILE_SYSTEM_ATTRIBUTE_INFO call */
> > - /* NB flags can come from FILE_SYSTEM_DEVICE_INFO call */
> > -} __packed;
> > -
> > struct smb_version_ops {
> > u16 (*get_cmd_val)(struct ksmbd_work *swork);
> > int (*init_rsp_hdr)(struct ksmbd_work *swork);
>

--
Thanks,

Steve