On Sat 03-09-11 02:22:31, Jan Kara wrote: > On Fri 02-09-11 16:23:43, Myklebust, Trond wrote: > > > -----Original Message----- > > > From: Jan Kara [mailto:jack@xxxxxxx] > > > Sent: Friday, September 02, 2011 7:10 PM > > > To: Myklebust, Trond > > > Cc: linux-nfs@xxxxxxxxxxxxxxx; Jan Kara; Josh Boyer; Myklebust, Trond > > > Subject: [PATCH] nfs: Enclose hostname in brackets when needed in > > > nfs_do_root_mount > > > > > > When hostname contains colon (e.g. when it is an IPv6 address) it > > needs > > > to be enclosed in brackets to make parsing of NFS device string > > > possible. > > > Fix nfs_do_root_mount() to enclose hostname properly when needed. NFS > > > code > > > actually does not need this as it does not parse the string passed by > > > nfs_do_root_mount() but the device string is exposed to userspace in > > > /proc/mounts. > > > > > > CC: Josh Boyer <jwboyer@xxxxxxxxxx> > > > CC: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx> > > > Signed-off-by: Jan Kara <jack@xxxxxxx> > > > --- > > > fs/nfs/super.c | 8 ++++++-- > > > 1 files changed, 6 insertions(+), 2 deletions(-) > > > > > > diff --git a/fs/nfs/super.c b/fs/nfs/super.c > > > index b961cea..42b74f8 100644 > > > --- a/fs/nfs/super.c > > > +++ b/fs/nfs/super.c > > > @@ -2694,11 +2694,15 @@ static struct vfsmount > > > *nfs_do_root_mount(struct file_system_type *fs_type, > > > char *root_devname; > > > size_t len; > > > > > > - len = strlen(hostname) + 3; > > > + len = strlen(hostname) + 5; > > > root_devname = kmalloc(len, GFP_KERNEL); > > > if (root_devname == NULL) > > > return ERR_PTR(-ENOMEM); > > > - snprintf(root_devname, len, "%s:/", hostname); > > > + /* Does hostname needs to be enclosed in brackets? */ > > > + if (strchr(hostname, ':')) > > > + snprintf(root_devname, len, "[%s]:/", hostname); > > > + else > > > + snprintf(root_devname, len, "%s:/", hostname); > > > > What if the hostname is already enclosed in brackets, as is usually the > > case if I enter an IPv6 address instead of a DNS name? Won't this cause > > it to be bracketed twice? > > > > IOW: If I try to > > > > mount -t nfs [fe80::20c:29ff:fee9:83e6]:/export /mnt > > > > won't the above end up returning a hostname of [[::20c:29ff:fee9:83e6]]? > No it won't - I've actually verified my patch with experiment ;). The > hostname nfs_do_root_mount() gets is already without possible brackets > (these have been removed when we first parsed the string passed from > userspace by nfs_parse_devname() - yes, it took me some time to drill > through the NFS call stack during mount to actually find out who removes > the brackets from the passed hostname and who composes the device name back > without them). Ping? Trond, will you merge the patch please? I guess it got somehow lost. Honza -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
