forked from Minki/linux
NFS: Use super.c for NFSROOT mount option parsing
Replace duplicate code in NFSROOT for mounting an NFS server on '/' with logic that uses the existing mainline text-based logic in the NFS client. Add documenting comments where appropriate. Note that this means NFSROOT mounts now use the same default settings as v2/v3 mounts done via mount(2) from user space. vers=3,tcp,rsize=<negotiated default>,wsize=<negotiated default> As before, however, no version/protocol negotiation with the server is done. 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
Trond Myklebust
parent
60ac03685b
commit
56463e50d1
182
fs/nfs/nfsroot.c
182
fs/nfs/nfsroot.c
@ -3,9 +3,10 @@
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*
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* Allow an NFS filesystem to be mounted as root. The way this works is:
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* (1) Use the IP autoconfig mechanism to set local IP addresses and routes.
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* (2) Handle RPC negotiation with the system which replied to RARP or
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* was reported as a boot server by BOOTP or manually.
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* (3) The actual mounting is done later, when init() is running.
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* (2) Construct the device string and the options string using DHCP
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* option 17 and/or kernel command line options.
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* (3) When mount_root() sets up the root file system, pass these strings
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* to the NFS client's regular mount interface via sys_mount().
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*
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*
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* Changes:
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@ -65,7 +66,8 @@
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* Hua Qin : Support for mounting root file system via
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* NFS over TCP.
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* Fabian Frederick: Option parser rebuilt (using parser lib)
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*/
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* Chuck Lever : Use super.c's text-based mount option parsing
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*/
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#include <linux/types.h>
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#include <linux/string.h>
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@ -101,11 +103,17 @@
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/* Parameters passed from the kernel command line */
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static char nfs_root_parms[256] __initdata = "";
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/* Text-based mount options passed to super.c */
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static char nfs_root_options[256] __initdata = "";
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/* Address of NFS server */
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static __be32 servaddr __initdata = 0;
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/* Name of directory to mount */
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static char nfs_export_path[NFS_MAXPATHLEN + 1] __initdata = { 0, };
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static char nfs_export_path[NFS_MAXPATHLEN + 1] __initdata = "";
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/* server:export path string passed to super.c */
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static char nfs_root_device[NFS_MAXPATHLEN + 1] __initdata = "";
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/* NFS-related data */
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static struct nfs_mount_data nfs_data __initdata = { 0, };/* NFS mount info */
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@ -537,7 +545,7 @@ out:
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* Get the NFS port numbers and file handle, and return the prepared 'data'
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* argument for mount() if everything went OK. Return NULL otherwise.
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*/
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void * __init nfs_root_data(void)
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void * __init old_nfs_root_data(void)
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{
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if (root_nfs_init() < 0
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|| root_nfs_ports() < 0
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@ -546,3 +554,165 @@ void * __init nfs_root_data(void)
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set_sockaddr((struct sockaddr_in *) &nfs_data.addr, servaddr, htons(nfs_port));
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return (void*)&nfs_data;
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}
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static int __init root_nfs_copy(char *dest, const char *src,
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const size_t destlen)
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{
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if (strlcpy(dest, src, destlen) > destlen)
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return -1;
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return 0;
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}
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static int __init root_nfs_cat(char *dest, const char *src,
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const size_t destlen)
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{
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if (strlcat(dest, src, destlen) > destlen)
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return -1;
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return 0;
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}
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/*
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* Parse out root export path and mount options from
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* passed-in string @incoming.
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*
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* Copy the export path into @exppath.
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*/
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static int __init root_nfs_parse_options(char *incoming, char *exppath,
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const size_t exppathlen)
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{
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char *p;
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/*
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* Set the NFS remote path
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*/
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p = strsep(&incoming, ",");
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if (*p != '\0' && strcmp(p, "default") != 0)
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if (root_nfs_copy(exppath, p, exppathlen))
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return -1;
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/*
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* @incoming now points to the rest of the string; if it
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* contains something, append it to our root options buffer
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*/
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if (incoming != NULL && *incoming != '\0')
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if (root_nfs_cat(nfs_root_options, incoming,
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sizeof(nfs_root_options)))
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return -1;
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/*
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* Possibly prepare for more options to be appended
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*/
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if (nfs_root_options[0] != '\0' &&
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nfs_root_options[strlen(nfs_root_options)] != ',')
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if (root_nfs_cat(nfs_root_options, ",",
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sizeof(nfs_root_options)))
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return -1;
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return 0;
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}
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/*
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* Decode the export directory path name and NFS options from
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* the kernel command line. This has to be done late in order to
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* use a dynamically acquired client IP address for the remote
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* root directory path.
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*
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* Returns zero if successful; otherwise -1 is returned.
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*/
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static int __init root_nfs_data(char *cmdline)
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{
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char addr_option[sizeof("nolock,addr=") + INET_ADDRSTRLEN + 1];
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int len, retval = -1;
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char *tmp = NULL;
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const size_t tmplen = sizeof(nfs_export_path);
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tmp = kzalloc(tmplen, GFP_KERNEL);
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if (tmp == NULL)
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goto out_nomem;
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strcpy(tmp, NFS_ROOT);
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if (root_server_path[0] != '\0') {
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dprintk("Root-NFS: DHCPv4 option 17: %s\n",
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root_server_path);
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if (root_nfs_parse_options(root_server_path, tmp, tmplen))
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goto out_optionstoolong;
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}
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if (cmdline[0] != '\0') {
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dprintk("Root-NFS: nfsroot=%s\n", cmdline);
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if (root_nfs_parse_options(cmdline, tmp, tmplen))
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goto out_optionstoolong;
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}
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/*
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* Append mandatory options for nfsroot so they override
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* what has come before
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*/
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snprintf(addr_option, sizeof(addr_option), "nolock,addr=%pI4",
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&servaddr);
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if (root_nfs_cat(nfs_root_options, addr_option,
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sizeof(nfs_root_options)))
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goto out_optionstoolong;
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/*
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* Set up nfs_root_device. For NFS mounts, this looks like
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*
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* server:/path
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*
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* At this point, utsname()->nodename contains our local
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* IP address or hostname, set by ipconfig. If "%s" exists
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* in tmp, substitute the nodename, then shovel the whole
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* mess into nfs_root_device.
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*/
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len = snprintf(nfs_export_path, sizeof(nfs_export_path),
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tmp, utsname()->nodename);
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if (len > (int)sizeof(nfs_export_path))
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goto out_devnametoolong;
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len = snprintf(nfs_root_device, sizeof(nfs_root_device),
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"%pI4:%s", &servaddr, nfs_export_path);
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if (len > (int)sizeof(nfs_root_device))
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goto out_devnametoolong;
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retval = 0;
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out:
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kfree(tmp);
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return retval;
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out_nomem:
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printk(KERN_ERR "Root-NFS: could not allocate memory\n");
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goto out;
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out_optionstoolong:
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printk(KERN_ERR "Root-NFS: mount options string too long\n");
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goto out;
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out_devnametoolong:
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printk(KERN_ERR "Root-NFS: root device name too long.\n");
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goto out;
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}
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/**
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* nfs_root_data - Return prepared 'data' for NFSROOT mount
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* @root_device: OUT: address of string containing NFSROOT device
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* @root_data: OUT: address of string containing NFSROOT mount options
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*
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* Returns zero and sets @root_device and @root_data if successful,
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* otherwise -1 is returned.
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*/
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int __init nfs_root_data(char **root_device, char **root_data)
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{
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#ifdef NFSROOT_DEBUG
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nfs_debug |= NFSDBG_ROOT | NFSDBG_MOUNT;
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#endif /* NFSROOT_DEBUG */
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servaddr = root_server_addr;
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if (servaddr == htonl(INADDR_NONE)) {
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printk(KERN_ERR "Root-NFS: no NFS server address\n");
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return -1;
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}
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if (root_nfs_data(nfs_root_parms) < 0)
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return -1;
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*root_device = nfs_root_device;
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*root_data = nfs_root_options;
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return 0;
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}
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@ -364,6 +364,7 @@ extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ct
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extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
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extern u64 nfs_compat_user_ino64(u64 fileid);
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extern void nfs_fattr_init(struct nfs_fattr *fattr);
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extern unsigned long nfs_inc_attr_generation_counter(void);
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extern struct nfs_fattr *nfs_alloc_fattr(void);
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@ -379,9 +380,12 @@ static inline void nfs_free_fhandle(const struct nfs_fh *fh)
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kfree(fh);
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}
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/*
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* linux/fs/nfs/nfsroot.c
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*/
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extern int nfs_root_data(char **root_device, char **root_data); /*__init*/
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/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
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extern __be32 root_nfs_parse_addr(char *name); /*__init*/
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extern unsigned long nfs_inc_attr_generation_counter(void);
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/*
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* linux/fs/nfs/file.c
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@ -584,10 +588,6 @@ nfs_fileid_to_ino_t(u64 fileid)
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return ino;
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}
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/* NFS root */
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extern void * nfs_root_data(void);
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#define nfs_wait_event(clnt, wq, condition) \
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({ \
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int __retval = wait_event_killable(wq, condition); \
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@ -291,13 +291,13 @@ out:
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#ifdef CONFIG_ROOT_NFS
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static int __init mount_nfs_root(void)
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{
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void *data = nfs_root_data();
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char *root_dev, *root_data;
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create_dev("/dev/root", ROOT_DEV);
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if (data &&
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do_mount_root("/dev/root", "nfs", root_mountflags, data) == 0)
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return 1;
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return 0;
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if (nfs_root_data(&root_dev, &root_data) != 0)
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return 0;
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if (do_mount_root(root_dev, "nfs", root_mountflags, root_data) != 0)
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return 0;
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return 1;
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}
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#endif
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