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NFS: Use common device name parsing logic for NFSv4 and NFSv2/v3

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To support passing a raw IPv6 address as a server hostname, we need to
expand the logic that handles splitting the passed-in device name into
a server hostname and export path

Start by pulling device name parsing out of the mount option validation
functions and into separate helper functions.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2008-06-23 12:36:37 -04:00 committed by Trond Myklebust
parent cd10072562
commit dc04589827
1 changed files with 79 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

124
fs/nfs/super.c
View File

@ -1195,6 +1195,67 @@ static int nfs_try_mount(struct nfs_parsed_mount_data *args,
return status;
}
/*
* Split "dev_name" into "hostname:export_path".
*
* Note: caller frees hostname and export path, even on error.
*/
static int nfs_parse_devname(const char *dev_name,
char **hostname, size_t maxnamlen,
char **export_path, size_t maxpathlen)
{
size_t len;
char *colon, *comma;
colon = strchr(dev_name, ':');
if (colon == NULL)
goto out_bad_devname;
len = colon - dev_name;
if (len > maxnamlen)
goto out_hostname;
/* N.B. caller will free nfs_server.hostname in all cases */
*hostname = kstrndup(dev_name, len, GFP_KERNEL);
if (!*hostname)
goto out_nomem;
/* kill possible hostname list: not supported */
comma = strchr(*hostname, ',');
if (comma != NULL) {
if (comma == *hostname)
goto out_bad_devname;
*comma = '\0';
}
colon++;
len = strlen(colon);
if (len > maxpathlen)
goto out_path;
*export_path = kstrndup(colon, len, GFP_KERNEL);
if (!*export_path)
goto out_nomem;
dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
return 0;
out_bad_devname:
dfprintk(MOUNT, "NFS: device name not in host:path format\n");
return -EINVAL;
out_nomem:
dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
return -ENOMEM;
out_hostname:
dfprintk(MOUNT, "NFS: server hostname too long\n");
return -ENAMETOOLONG;
out_path:
dfprintk(MOUNT, "NFS: export pathname too long\n");
return -ENAMETOOLONG;
}
/*
* Validate the NFS2/NFS3 mount data
* - fills in the mount root filehandle
@ -1323,8 +1384,6 @@ static int nfs_validate_mount_data(void *options,
break;
default: {
unsigned int len;
char *c;
int status;
if (nfs_parse_mount_options((char *)options, args) == 0)
@ -1334,21 +1393,17 @@ static int nfs_validate_mount_data(void *options,
&args->nfs_server.address))
goto out_no_address;
c = strchr(dev_name, ':');
if (c == NULL)
return -EINVAL;
len = c - dev_name;
/* N.B. caller will free nfs_server.hostname in all cases */
args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
if (!args->nfs_server.hostname)
goto out_nomem;
status = nfs_parse_devname(dev_name,
&args->nfs_server.hostname,
PAGE_SIZE,
&args->nfs_server.export_path,
NFS_MAXPATHLEN);
if (!status)
status = nfs_try_mount(args, mntfh);
c++;
if (strlen(c) > NFS_MAXPATHLEN)
return -ENAMETOOLONG;
args->nfs_server.export_path = c;
kfree(args->nfs_server.export_path);
args->nfs_server.export_path = NULL;
status = nfs_try_mount(args, mntfh);
if (status)
return status;
@ -1958,7 +2013,7 @@ static int nfs4_validate_mount_data(void *options,
break;
default: {
unsigned int len;
int status;
if (nfs_parse_mount_options((char *)options, args) == 0)
return -EINVAL;
@ -1977,34 +2032,17 @@ static int nfs4_validate_mount_data(void *options,
goto out_inval_auth;
}
/*
* Split "dev_name" into "hostname:mntpath".
*/
c = strchr(dev_name, ':');
if (c == NULL)
return -EINVAL;
/* while calculating len, pretend ':' is '\0' */
len = c - dev_name;
if (len > NFS4_MAXNAMLEN)
return -ENAMETOOLONG;
/* N.B. caller will free nfs_server.hostname in all cases */
args->nfs_server.hostname = kstrndup(dev_name, len, GFP_KERNEL);
if (!args->nfs_server.hostname)
goto out_nomem;
c++; /* step over the ':' */
len = strlen(c);
if (len > NFS4_MAXPATHLEN)
return -ENAMETOOLONG;
args->nfs_server.export_path = kstrndup(c, len, GFP_KERNEL);
if (!args->nfs_server.export_path)
goto out_nomem;
dprintk("NFS: MNTPATH: '%s'\n", args->nfs_server.export_path);
if (args->client_address == NULL)
goto out_no_client_address;
status = nfs_parse_devname(dev_name,
&args->nfs_server.hostname,
NFS4_MAXNAMLEN,
&args->nfs_server.export_path,
NFS4_MAXPATHLEN);
if (status < 0)
return status;
break;
}
}
@ -2020,10 +2058,6 @@ out_inval_auth:
data->auth_flavourlen);
return -EINVAL;
out_nomem:
dfprintk(MOUNT, "NFS4: not enough memory to handle mount options\n");
return -ENOMEM;
out_no_address:
dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n");
return -EINVAL;