From: Steve French Date: Fri, 29 Jun 2018 21:06:15 +0000 (-0500) Subject: smb3: snapshot mounts are read-only and make sure info is displayable about the mount X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=8a69e96e610b3ec8a55f6fd4e44363452838caa7;p=linux.git smb3: snapshot mounts are read-only and make sure info is displayable about the mount snapshot mounts were not marked as read-only and did not display the snapshot time (in /proc/mounts) specified on mount With this patch - note that can not write to the snapshot mount (see "ro" in /proc/mounts line) and also the missing snapshot timewarp token time is dumped. Sample line from /proc/mounts with the patch: //127.0.0.1/scratch /mnt2 smb3 ro,relatime,vers=default,cache=strict,username=testuser,domain=,uid=0,noforceuid,gid=0,noforcegid,addr=127.0.0.1,file_mode=0755,dir_mode=0755,soft,nounix,serverino,mapposix,noperm,rsize=1048576,wsize=1048576,echo_interval=60,snapshot=1234567,actimeo=1 0 0 Signed-off-by: Steve French Reviewed-by: Paulo Alcantara --- diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index c162a416ddbfc..de16078e456b1 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -139,6 +139,9 @@ cifs_read_super(struct super_block *sb) if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL) sb->s_flags |= SB_POSIXACL; + if (tcon->snapshot_time) + sb->s_flags |= SB_RDONLY; + if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files) sb->s_maxbytes = MAX_LFS_FILESIZE; else @@ -540,6 +543,8 @@ cifs_show_options(struct seq_file *s, struct dentry *root) seq_printf(s, ",wsize=%u", cifs_sb->wsize); seq_printf(s, ",echo_interval=%lu", tcon->ses->server->echo_interval / HZ); + if (tcon->snapshot_time) + seq_printf(s, ",snapshot=%llu", tcon->snapshot_time); /* convert actimeo and display it in seconds */ seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);