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NFS: Clean up NFSROOT command line parsing 

Clean up: To reduce confusion, rename nfs_root_name as nfs_root_parms,
as this buffer contains more than just the name of the remote server.

Introduce documenting comments around nfs_root_setup().

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 2010-09-17 10:54:37 -04:00 committed by Trond Myklebust
parent ed58b2917b
commit 60ac03685b
1 changed files with 23 additions and 9 deletions
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32
fs/nfs/nfsroot.c
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@ -99,7 +99,7 @@
#define NFS_ROOT "/tftpboot/%s"
/* Parameters passed from the kernel command line */
static char nfs_root_name[256] __initdata = "";
static char nfs_root_parms[256] __initdata = "";
/* Address of NFS server */
static __be32 servaddr __initdata = 0;
@ -369,7 +369,7 @@ static int __init root_nfs_init(void)
* be able to use the client IP address for the remote root
* directory (necessary for pure RARP booting).
*/
if (root_nfs_name(nfs_root_name) < 0 ||
if (root_nfs_name(nfs_root_parms) < 0 ||
root_nfs_addr() < 0)
return -1;
@ -380,23 +380,37 @@ static int __init root_nfs_init(void)
return 0;
}
/*
* Parse NFS server and directory information passed on the kernel
* command line.
*
* nfsroot=[<server-ip>:]<root-dir>[,<nfs-options>]
*
* If there is a "%s" token in the <root-dir> string, it is replaced
* by the ASCII-representation of the client's IP address.
*/
static int __init nfs_root_setup(char *line)
{
ROOT_DEV = Root_NFS;
if (line[0] == '/' || line[0] == ',' || (line[0] >= '0' && line[0] <= '9')) {
strlcpy(nfs_root_name, line, sizeof(nfs_root_name));
strlcpy(nfs_root_parms, line, sizeof(nfs_root_parms));
} else {
int n = strlen(line) + sizeof(NFS_ROOT) - 1;
if (n >= sizeof(nfs_root_name))
line[sizeof(nfs_root_name) - sizeof(NFS_ROOT) - 2] = '\0';
sprintf(nfs_root_name, NFS_ROOT, line);
size_t n = strlen(line) + sizeof(NFS_ROOT) - 1;
if (n >= sizeof(nfs_root_parms))
line[sizeof(nfs_root_parms) - sizeof(NFS_ROOT) - 2] = '\0';
sprintf(nfs_root_parms, NFS_ROOT, line);
}
root_server_addr = root_nfs_parse_addr(nfs_root_name);
/*
* Extract the IP address of the NFS server containing our
* root file system, if one was specified.
*
* Note: root_nfs_parse_addr() removes the server-ip from
* nfs_root_parms, if it exists.
*/
root_server_addr = root_nfs_parse_addr(nfs_root_parms);
return 1;
}