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authorSteve French <stfrench@microsoft.com>2020-02-06 15:00:14 +0300
committerSteve French <stfrench@microsoft.com>2020-02-06 18:14:28 +0300
commitd26c2ddd33569667e3eeb577c4c1d966ca9192e2 (patch)
tree2b6285e86f3d90cf6f49fba3c160f76faf5d70d7 /fs/cifs/ioctl.c
parent343a1b777a92af3022c95ab6c188bef4a6e9ff97 (diff)
downloadlinux-d26c2ddd33569667e3eeb577c4c1d966ca9192e2.tar.xz
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/ioctl.c')
-rw-r--r--fs/cifs/ioctl.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c
index e4c935026d5e..4a73e63c4d43 100644
--- a/fs/cifs/ioctl.c
+++ b/fs/cifs/ioctl.c
@@ -169,6 +169,7 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
unsigned int xid;
struct cifsFileInfo *pSMBFile = filep->private_data;
struct cifs_tcon *tcon;
+ struct cifs_sb_info *cifs_sb;
__u64 ExtAttrBits = 0;
__u64 caps;
@@ -299,6 +300,21 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
else
rc = 0;
break;
+ case CIFS_IOC_NOTIFY:
+ if (!S_ISDIR(inode->i_mode)) {
+ /* Notify can only be done on directories */
+ rc = -EOPNOTSUPP;
+ break;
+ }
+ cifs_sb = CIFS_SB(inode->i_sb);
+ tcon = tlink_tcon(cifs_sb_tlink(cifs_sb));
+ if (tcon && tcon->ses->server->ops->notify) {
+ rc = tcon->ses->server->ops->notify(xid,
+ filep, (void __user *)arg);
+ cifs_dbg(FYI, "ioctl notify rc %d\n", rc);
+ } else
+ rc = -EOPNOTSUPP;
+ break;
default:
cifs_dbg(FYI, "unsupported ioctl\n");
break;