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A commonly used SMB3 feature is change notification, allowing an
app to be notified about changes to a directory. The SMB3
Notify request blocks until the server detects a change to that
directory or its contents that matches the completion flags
that were passed in and the "watch_tree" flag (which indicates
whether subdirectories under this directory should be also
included). See MS-SMB2 2.2.35 for additional detail.
To use this simply pass in the following structure to ioctl:
struct __attribute__((__packed__)) smb3_notify {
uint32_t completion_filter;
bool watch_tree;
} __packed;
using CIFS_IOC_NOTIFY 0x4005cf09
or equivalently _IOW(CIFS_IOCTL_MAGIC, 9, struct smb3_notify)
SMB3 change notification is supported by all major servers.
The ioctl will block until the server detects a change to that
directory or its subdirectories (if watch_tree is set).
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Acked-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/*
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* fs/cifs/cifs_ioctl.h
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*
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* Structure definitions for io control for cifs/smb3
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*
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* Copyright (c) 2015 Steve French <steve.french@primarydata.com>
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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*/
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struct smb_mnt_fs_info {
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__u32 version; /* 0001 */
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__u16 protocol_id;
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__u16 tcon_flags;
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__u32 vol_serial_number;
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__u32 vol_create_time;
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__u32 share_caps;
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__u32 share_flags;
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__u32 sector_flags;
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__u32 optimal_sector_size;
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__u32 max_bytes_chunk;
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__u32 fs_attributes;
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__u32 max_path_component;
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__u32 device_type;
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__u32 device_characteristics;
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__u32 maximal_access;
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__u64 cifs_posix_caps;
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} __packed;
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struct smb_snapshot_array {
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__u32 number_of_snapshots;
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__u32 number_of_snapshots_returned;
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__u32 snapshot_array_size;
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/* snapshots[]; */
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} __packed;
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/* query_info flags */
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#define PASSTHRU_QUERY_INFO 0x00000000
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#define PASSTHRU_FSCTL 0x00000001
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#define PASSTHRU_SET_INFO 0x00000002
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struct smb_query_info {
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__u32 info_type;
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__u32 file_info_class;
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__u32 additional_information;
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__u32 flags;
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__u32 input_buffer_length;
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__u32 output_buffer_length;
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/* char buffer[]; */
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} __packed;
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struct smb3_key_debug_info {
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__u64 Suid;
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__u16 cipher_type;
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__u8 auth_key[16]; /* SMB2_NTLMV2_SESSKEY_SIZE */
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__u8 smb3encryptionkey[SMB3_SIGN_KEY_SIZE];
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__u8 smb3decryptionkey[SMB3_SIGN_KEY_SIZE];
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} __packed;
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struct smb3_notify {
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__u32 completion_filter;
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bool watch_tree;
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} __packed;
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#define CIFS_IOCTL_MAGIC 0xCF
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#define CIFS_IOC_COPYCHUNK_FILE _IOW(CIFS_IOCTL_MAGIC, 3, int)
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#define CIFS_IOC_SET_INTEGRITY _IO(CIFS_IOCTL_MAGIC, 4)
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#define CIFS_IOC_GET_MNT_INFO _IOR(CIFS_IOCTL_MAGIC, 5, struct smb_mnt_fs_info)
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#define CIFS_ENUMERATE_SNAPSHOTS _IOR(CIFS_IOCTL_MAGIC, 6, struct smb_snapshot_array)
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#define CIFS_QUERY_INFO _IOWR(CIFS_IOCTL_MAGIC, 7, struct smb_query_info)
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#define CIFS_DUMP_KEY _IOWR(CIFS_IOCTL_MAGIC, 8, struct smb3_key_debug_info)
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#define CIFS_IOC_NOTIFY _IOW(CIFS_IOCTL_MAGIC, 9, struct smb3_notify)
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