cifs: add "mfsymlinks" mount option
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>
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@ -527,6 +527,11 @@ A partial list of the supported mount options follows:
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SFU does). In the future the bottom 9 bits of the
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mode also will be emulated using queries of the security
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descriptor (ACL).
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mfsymlinks Enable support for Minshall+French symlinks
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(see http://wiki.samba.org/index.php/UNIX_Extensions#Minshall.2BFrench_symlinks)
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This option is ignored when specified together with the
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'sfu' option. Minshall+French symlinks are used even if
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the server supports the CIFS Unix Extensions.
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sign Must use packet signing (helps avoid unwanted data modification
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by intermediate systems in the route). Note that signing
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does not work with lanman or plaintext authentication.
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@ -441,6 +441,8 @@ cifs_show_options(struct seq_file *s, struct vfsmount *m)
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seq_printf(s, ",dynperm");
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if (m->mnt_sb->s_flags & MS_POSIXACL)
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seq_printf(s, ",acl");
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
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seq_printf(s, ",mfsymlinks");
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seq_printf(s, ",rsize=%d", cifs_sb->rsize);
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seq_printf(s, ",wsize=%d", cifs_sb->wsize);
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@ -100,6 +100,7 @@ struct smb_vol {
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bool noautotune:1;
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bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
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bool fsc:1; /* enable fscache */
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bool mfsymlinks:1; /* use Minshall+French Symlinks */
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unsigned int rsize;
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unsigned int wsize;
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bool sockopt_tcp_nodelay:1;
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@ -1342,6 +1343,8 @@ cifs_parse_mount_options(char *options, const char *devname,
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"/proc/fs/cifs/LookupCacheEnabled to 0\n");
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} else if (strnicmp(data, "fsc", 3) == 0) {
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vol->fsc = true;
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} else if (strnicmp(data, "mfsymlinks", 10) == 0) {
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vol->mfsymlinks = true;
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} else
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printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
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data);
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@ -2554,6 +2557,14 @@ static void setup_cifs_sb(struct smb_vol *pvolume_info,
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cFYI(1, "mounting share using direct i/o");
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cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
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}
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if (pvolume_info->mfsymlinks) {
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if (pvolume_info->sfu_emul) {
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cERROR(1, "mount option mfsymlinks ignored if sfu "
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"mount option is used");
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} else {
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cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
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}
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}
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if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
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cERROR(1, "mount option dynperm ignored if cifsacl "
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