diff options
| author | Steve French <stfrench@microsoft.com> | 2020-02-06 06:00:14 -0600 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2020-02-06 09:14:28 -0600 |
| commit | d26c2ddd33569667e3eeb577c4c1d966ca9192e2 (patch) | |
| tree | 2b6285e86f3d90cf6f49fba3c160f76faf5d70d7 /fs/cifs/smb2pdu.c | |
| parent | 343a1b777a92af3022c95ab6c188bef4a6e9ff97 (diff) | |
cifs: add SMB3 change notification support
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>
Diffstat (limited to 'fs/cifs/smb2pdu.c')
| -rw-r--r-- | fs/cifs/smb2pdu.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index 1a732ff71de4..47cce0bd1afe 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -3363,6 +3363,7 @@ SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst, req->PersistentFileId = persistent_fid; req->VolatileFileId = volatile_fid; + /* See note 354 of MS-SMB2, 64K max */ req->OutputBufferLength = cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE); req->CompletionFilter = cpu_to_le32(completion_filter); |