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cifs: add "mfsymlinks" mount option

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This is the start for an implementation of "Minshall+French Symlinks"
(see http://wiki.samba.org/index.php/UNIX_Extensions#Minshall.2BFrench_symlinks).

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Stefan Metzmacher 2010-07-30 14:56:00 +02:00 committed by Steve French
parent 1b12b9c15b
commit 736a332059
3 changed files with 18 additions and 0 deletions
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5
fs/cifs/README
View file

@ -527,6 +527,11 @@ A partial list of the supported mount options follows:
SFU does). In the future the bottom 9 bits of the
mode also will be emulated using queries of the security
descriptor (ACL).
mfsymlinks Enable support for Minshall+French symlinks
(see http://wiki.samba.org/index.php/UNIX_Extensions#Minshall.2BFrench_symlinks)
This option is ignored when specified together with the
'sfu' option. Minshall+French symlinks are used even if
the server supports the CIFS Unix Extensions.
sign Must use packet signing (helps avoid unwanted data modification
by intermediate systems in the route). Note that signing
does not work with lanman or plaintext authentication.

2
fs/cifs/cifsfs.c
View file

@ -441,6 +441,8 @@ cifs_show_options(struct seq_file *s, struct vfsmount *m)
seq_printf(s, ",dynperm");
if (m->mnt_sb->s_flags & MS_POSIXACL)
seq_printf(s, ",acl");
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
seq_printf(s, ",mfsymlinks");
seq_printf(s, ",rsize=%d", cifs_sb->rsize);
seq_printf(s, ",wsize=%d", cifs_sb->wsize);

11
fs/cifs/connect.c
View file

@ -100,6 +100,7 @@ struct smb_vol {
bool noautotune:1;
bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
bool fsc:1; /* enable fscache */
bool mfsymlinks:1; /* use Minshall+French Symlinks */
unsigned int rsize;
unsigned int wsize;
bool sockopt_tcp_nodelay:1;
@ -1342,6 +1343,8 @@ cifs_parse_mount_options(char *options, const char *devname,
"/proc/fs/cifs/LookupCacheEnabled to 0\n");
} else if (strnicmp(data, "fsc", 3) == 0) {
vol->fsc = true;
} else if (strnicmp(data, "mfsymlinks", 10) == 0) {
vol->mfsymlinks = true;
} else
printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
data);
@ -2554,6 +2557,14 @@ static void setup_cifs_sb(struct smb_vol *pvolume_info,
cFYI(1, "mounting share using direct i/o");
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
}
if (pvolume_info->mfsymlinks) {
if (pvolume_info->sfu_emul) {
cERROR(1, "mount option mfsymlinks ignored if sfu "
"mount option is used");
} else {
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
}
}
if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
cERROR(1, "mount option dynperm ignored if cifsacl "