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linux-2.6/fs/nfsd/nfsctl.c

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/*
* linux/fs/nfsd/nfsctl.c
*
* Syscall interface to knfsd.
*
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#include <linux/module.h>
#include <linux/linkage.h>
#include <linux/time.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/fcntl.h>
#include <linux/net.h>
#include <linux/in.h>
#include <linux/syscalls.h>
#include <linux/unistd.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/pagemap.h>
#include <linux/init.h>
lockd: unlock lockd locks associated with a given server ip For high-availability NFS service, we generally need to be able to drop file locks held on the exported filesystem before moving clients to a new server. Currently the only way to do that is by shutting down lockd entirely, which is often undesireable (for example, if you want to continue exporting other filesystems). This patch allows the administrator to release all locks held by clients accessing the client through a given server ip address, by echoing that address to a new file, /proc/fs/nfsd/unlock_ip, as in: shell> echo 10.1.1.2 > /proc/fs/nfsd/unlock_ip The expected sequence of events can be: 1. Tear down the IP address 2. Unexport the path 3. Write IP to /proc/fs/nfsd/unlock_ip to unlock files 4. Signal peer to begin take-over. For now we only support IPv4 addresses and NFSv2/v3 (NFSv4 locks are not affected). Also, if unmounting the filesystem is required, we assume at step 3 that clients using the given server ip are the only clients holding locks on the given filesystem; otherwise, an additional patch is required to allow revoking all locks held by lockd on a given filesystem. Signed-off-by: S. Wendy Cheng <wcheng@redhat.com> Cc: Lon Hohberger <lhh@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> fs/lockd/svcsubs.c | 66 +++++++++++++++++++++++++++++++++++++++----- fs/nfsd/nfsctl.c | 65 +++++++++++++++++++++++++++++++++++++++++++ include/linux/lockd/lockd.h | 7 ++++ 3 files changed, 131 insertions(+), 7 deletions(-)
2008-01-17 16:10:12 +00:00
#include <linux/inet.h>
#include <linux/string.h>
#include <linux/smp_lock.h>
#include <linux/ctype.h>
#include <linux/nfs.h>
#include <linux/nfsd_idmap.h>
#include <linux/lockd/bind.h>
#include <linux/sunrpc/svc.h>
#include <linux/sunrpc/svcsock.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/cache.h>
#include <linux/nfsd/xdr.h>
#include <linux/nfsd/syscall.h>
lockd: unlock lockd locks associated with a given server ip For high-availability NFS service, we generally need to be able to drop file locks held on the exported filesystem before moving clients to a new server. Currently the only way to do that is by shutting down lockd entirely, which is often undesireable (for example, if you want to continue exporting other filesystems). This patch allows the administrator to release all locks held by clients accessing the client through a given server ip address, by echoing that address to a new file, /proc/fs/nfsd/unlock_ip, as in: shell> echo 10.1.1.2 > /proc/fs/nfsd/unlock_ip The expected sequence of events can be: 1. Tear down the IP address 2. Unexport the path 3. Write IP to /proc/fs/nfsd/unlock_ip to unlock files 4. Signal peer to begin take-over. For now we only support IPv4 addresses and NFSv2/v3 (NFSv4 locks are not affected). Also, if unmounting the filesystem is required, we assume at step 3 that clients using the given server ip are the only clients holding locks on the given filesystem; otherwise, an additional patch is required to allow revoking all locks held by lockd on a given filesystem. Signed-off-by: S. Wendy Cheng <wcheng@redhat.com> Cc: Lon Hohberger <lhh@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> fs/lockd/svcsubs.c | 66 +++++++++++++++++++++++++++++++++++++++----- fs/nfsd/nfsctl.c | 65 +++++++++++++++++++++++++++++++++++++++++++ include/linux/lockd/lockd.h | 7 ++++ 3 files changed, 131 insertions(+), 7 deletions(-)
2008-01-17 16:10:12 +00:00
#include <linux/lockd/lockd.h>
#include <asm/uaccess.h>
#include <net/ipv6.h>
/*
* We have a single directory with 9 nodes in it.
*/
enum {
NFSD_Root = 1,
NFSD_Svc,
NFSD_Add,
NFSD_Del,
NFSD_Export,
NFSD_Unexport,
NFSD_Getfd,
NFSD_Getfs,
NFSD_List,
NFSD_Fh,
lockd: unlock lockd locks associated with a given server ip For high-availability NFS service, we generally need to be able to drop file locks held on the exported filesystem before moving clients to a new server. Currently the only way to do that is by shutting down lockd entirely, which is often undesireable (for example, if you want to continue exporting other filesystems). This patch allows the administrator to release all locks held by clients accessing the client through a given server ip address, by echoing that address to a new file, /proc/fs/nfsd/unlock_ip, as in: shell> echo 10.1.1.2 > /proc/fs/nfsd/unlock_ip The expected sequence of events can be: 1. Tear down the IP address 2. Unexport the path 3. Write IP to /proc/fs/nfsd/unlock_ip to unlock files 4. Signal peer to begin take-over. For now we only support IPv4 addresses and NFSv2/v3 (NFSv4 locks are not affected). Also, if unmounting the filesystem is required, we assume at step 3 that clients using the given server ip are the only clients holding locks on the given filesystem; otherwise, an additional patch is required to allow revoking all locks held by lockd on a given filesystem. Signed-off-by: S. Wendy Cheng <wcheng@redhat.com> Cc: Lon Hohberger <lhh@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> fs/lockd/svcsubs.c | 66 +++++++++++++++++++++++++++++++++++++++----- fs/nfsd/nfsctl.c | 65 +++++++++++++++++++++++++++++++++++++++++++ include/linux/lockd/lockd.h | 7 ++++ 3 files changed, 131 insertions(+), 7 deletions(-)
2008-01-17 16:10:12 +00:00
NFSD_FO_UnlockIP,
NFSD_Threads,
NFSD_Pool_Threads,
NFSD_Versions,
NFSD_Ports,
NFSD_MaxBlkSize,
/*
* The below MUST come last. Otherwise we leave a hole in nfsd_files[]
* with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
*/
#ifdef CONFIG_NFSD_V4
NFSD_Leasetime,
NFSD_RecoveryDir,
#endif
};
/*
* write() for these nodes.
*/
static ssize_t write_svc(struct file *file, char *buf, size_t size);
static ssize_t write_add(struct file *file, char *buf, size_t size);
static ssize_t write_del(struct file *file, char *buf, size_t size);
static ssize_t write_export(struct file *file, char *buf, size_t size);
static ssize_t write_unexport(struct file *file, char *buf, size_t size);
static ssize_t write_getfd(struct file *file, char *buf, size_t size);
static ssize_t write_getfs(struct file *file, char *buf, size_t size);
static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
static ssize_t write_threads(struct file *file, char *buf, size_t size);
static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
static ssize_t write_versions(struct file *file, char *buf, size_t size);
static ssize_t write_ports(struct file *file, char *buf, size_t size);
static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
#ifdef CONFIG_NFSD_V4
static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
#endif
lockd: unlock lockd locks associated with a given server ip For high-availability NFS service, we generally need to be able to drop file locks held on the exported filesystem before moving clients to a new server. Currently the only way to do that is by shutting down lockd entirely, which is often undesireable (for example, if you want to continue exporting other filesystems). This patch allows the administrator to release all locks held by clients accessing the client through a given server ip address, by echoing that address to a new file, /proc/fs/nfsd/unlock_ip, as in: shell> echo 10.1.1.2 > /proc/fs/nfsd/unlock_ip The expected sequence of events can be: 1. Tear down the IP address 2. Unexport the path 3. Write IP to /proc/fs/nfsd/unlock_ip to unlock files 4. Signal peer to begin take-over. For now we only support IPv4 addresses and NFSv2/v3 (NFSv4 locks are not affected). Also, if unmounting the filesystem is required, we assume at step 3 that clients using the given server ip are the only clients holding locks on the given filesystem; otherwise, an additional patch is required to allow revoking all locks held by lockd on a given filesystem. Signed-off-by: S. Wendy Cheng <wcheng@redhat.com> Cc: Lon Hohberger <lhh@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> fs/lockd/svcsubs.c | 66 +++++++++++++++++++++++++++++++++++++++----- fs/nfsd/nfsctl.c | 65 +++++++++++++++++++++++++++++++++++++++++++ include/linux/lockd/lockd.h | 7 ++++ 3 files changed, 131 insertions(+), 7 deletions(-)
2008-01-17 16:10:12 +00:00
static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size);
static ssize_t (*write_op[])(struct file *, char *, size_t) = {
[NFSD_Svc] = write_svc,
[NFSD_Add] = write_add,
[NFSD_Del] = write_del,
[NFSD_Export] = write_export,
[NFSD_Unexport] = write_unexport,
[NFSD_Getfd] = write_getfd,
[NFSD_Getfs] = write_getfs,
[NFSD_Fh] = write_filehandle,
lockd: unlock lockd locks associated with a given server ip For high-availability NFS service, we generally need to be able to drop file locks held on the exported filesystem before moving clients to a new server. Currently the only way to do that is by shutting down lockd entirely, which is often undesireable (for example, if you want to continue exporting other filesystems). This patch allows the administrator to release all locks held by clients accessing the client through a given server ip address, by echoing that address to a new file, /proc/fs/nfsd/unlock_ip, as in: shell> echo 10.1.1.2 > /proc/fs/nfsd/unlock_ip The expected sequence of events can be: 1. Tear down the IP address 2. Unexport the path 3. Write IP to /proc/fs/nfsd/unlock_ip to unlock files 4. Signal peer to begin take-over. For now we only support IPv4 addresses and NFSv2/v3 (NFSv4 locks are not affected). Also, if unmounting the filesystem is required, we assume at step 3 that clients using the given server ip are the only clients holding locks on the given filesystem; otherwise, an additional patch is required to allow revoking all locks held by lockd on a given filesystem. Signed-off-by: S. Wendy Cheng <wcheng@redhat.com> Cc: Lon Hohberger <lhh@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> fs/lockd/svcsubs.c | 66 +++++++++++++++++++++++++++++++++++++++----- fs/nfsd/nfsctl.c | 65 +++++++++++++++++++++++++++++++++++++++++++ include/linux/lockd/lockd.h | 7 ++++ 3 files changed, 131 insertions(+), 7 deletions(-)
2008-01-17 16:10:12 +00:00
[NFSD_FO_UnlockIP] = failover_unlock_ip,
[NFSD_Threads] = write_threads,
[NFSD_Pool_Threads] = write_pool_threads,
[NFSD_Versions] = write_versions,
[NFSD_Ports] = write_ports,
[NFSD_MaxBlkSize] = write_maxblksize,
#ifdef CONFIG_NFSD_V4
[NFSD_Leasetime] = write_leasetime,
[NFSD_RecoveryDir] = write_recoverydir,
#endif
};
static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
{
ino_t ino = file->f_path.dentry->d_inode->i_ino;
char *data;
ssize_t rv;
if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
return -EINVAL;
data = simple_transaction_get(file, buf, size);
if (IS_ERR(data))
return PTR_ERR(data);
rv = write_op[ino](file, data, size);
if (rv >= 0) {
simple_transaction_set(file, rv);
rv = size;
}
return rv;
}
static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
{
if (! file->private_data) {
/* An attempt to read a transaction file without writing
* causes a 0-byte write so that the file can return
* state information
*/
ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
if (rv < 0)
return rv;
}
return simple_transaction_read(file, buf, size, pos);
}
static const struct file_operations transaction_ops = {
.write = nfsctl_transaction_write,
.read = nfsctl_transaction_read,
.release = simple_transaction_release,
};
static int exports_open(struct inode *inode, struct file *file)
{
return seq_open(file, &nfs_exports_op);
}
static const struct file_operations exports_operations = {
.open = exports_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
/*----------------------------------------------------------------------------*/
/*
* payload - write methods
* If the method has a response, the response should be put in buf,
* and the length returned. Otherwise return 0 or and -error.
*/
static ssize_t write_svc(struct file *file, char *buf, size_t size)
{
struct nfsctl_svc *data;
if (size < sizeof(*data))
return -EINVAL;
data = (struct nfsctl_svc*) buf;
return nfsd_svc(data->svc_port, data->svc_nthreads);
}
static ssize_t write_add(struct file *file, char *buf, size_t size)
{
struct nfsctl_client *data;
if (size < sizeof(*data))
return -EINVAL;
data = (struct nfsctl_client *)buf;
return exp_addclient(data);
}
static ssize_t write_del(struct file *file, char *buf, size_t size)
{
struct nfsctl_client *data;
if (size < sizeof(*data))
return -EINVAL;
data = (struct nfsctl_client *)buf;
return exp_delclient(data);
}
static ssize_t write_export(struct file *file, char *buf, size_t size)
{
struct nfsctl_export *data;
if (size < sizeof(*data))
return -EINVAL;
data = (struct nfsctl_export*)buf;
return exp_export(data);
}
static ssize_t write_unexport(struct file *file, char *buf, size_t size)
{
struct nfsctl_export *data;
if (size < sizeof(*data))
return -EINVAL;
data = (struct nfsctl_export*)buf;
return exp_unexport(data);
}
static ssize_t write_getfs(struct file *file, char *buf, size_t size)
{
struct nfsctl_fsparm *data;
struct sockaddr_in *sin;
struct auth_domain *clp;
int err = 0;
struct knfsd_fh *res;
struct in6_addr in6;
if (size < sizeof(*data))
return -EINVAL;
data = (struct nfsctl_fsparm*)buf;
err = -EPROTONOSUPPORT;
if (data->gd_addr.sa_family != AF_INET)
goto out;
sin = (struct sockaddr_in *)&data->gd_addr;
if (data->gd_maxlen > NFS3_FHSIZE)
data->gd_maxlen = NFS3_FHSIZE;
res = (struct knfsd_fh*)buf;
exp_readlock();
ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
clp = auth_unix_lookup(&in6);
if (!clp)
err = -EPERM;
else {
err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
auth_domain_put(clp);
}
exp_readunlock();
if (err == 0)
err = res->fh_size + offsetof(struct knfsd_fh, fh_base);
out:
return err;
}
static ssize_t write_getfd(struct file *file, char *buf, size_t size)
{
struct nfsctl_fdparm *data;
struct sockaddr_in *sin;
struct auth_domain *clp;
int err = 0;
struct knfsd_fh fh;
char *res;
struct in6_addr in6;
if (size < sizeof(*data))
return -EINVAL;
data = (struct nfsctl_fdparm*)buf;
err = -EPROTONOSUPPORT;
if (data->gd_addr.sa_family != AF_INET)
goto out;
err = -EINVAL;
if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
goto out;
res = buf;
sin = (struct sockaddr_in *)&data->gd_addr;
exp_readlock();
ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &in6);
clp = auth_unix_lookup(&in6);
if (!clp)
err = -EPERM;
else {
err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
auth_domain_put(clp);
}
exp_readunlock();
if (err == 0) {
memset(res,0, NFS_FHSIZE);
memcpy(res, &fh.fh_base, fh.fh_size);
err = NFS_FHSIZE;
}
out:
return err;
}
lockd: unlock lockd locks associated with a given server ip For high-availability NFS service, we generally need to be able to drop file locks held on the exported filesystem before moving clients to a new server. Currently the only way to do that is by shutting down lockd entirely, which is often undesireable (for example, if you want to continue exporting other filesystems). This patch allows the administrator to release all locks held by clients accessing the client through a given server ip address, by echoing that address to a new file, /proc/fs/nfsd/unlock_ip, as in: shell> echo 10.1.1.2 > /proc/fs/nfsd/unlock_ip The expected sequence of events can be: 1. Tear down the IP address 2. Unexport the path 3. Write IP to /proc/fs/nfsd/unlock_ip to unlock files 4. Signal peer to begin take-over. For now we only support IPv4 addresses and NFSv2/v3 (NFSv4 locks are not affected). Also, if unmounting the filesystem is required, we assume at step 3 that clients using the given server ip are the only clients holding locks on the given filesystem; otherwise, an additional patch is required to allow revoking all locks held by lockd on a given filesystem. Signed-off-by: S. Wendy Cheng <wcheng@redhat.com> Cc: Lon Hohberger <lhh@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> fs/lockd/svcsubs.c | 66 +++++++++++++++++++++++++++++++++++++++----- fs/nfsd/nfsctl.c | 65 +++++++++++++++++++++++++++++++++++++++++++ include/linux/lockd/lockd.h | 7 ++++ 3 files changed, 131 insertions(+), 7 deletions(-)
2008-01-17 16:10:12 +00:00
static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size)
{
__be32 server_ip;
char *fo_path, c;
int b1, b2, b3, b4;
/* sanity check */
if (size == 0)
return -EINVAL;
if (buf[size-1] != '\n')
return -EINVAL;
fo_path = buf;
if (qword_get(&buf, fo_path, size) < 0)
return -EINVAL;
/* get ipv4 address */
if (sscanf(fo_path, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
return -EINVAL;
server_ip = htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
return nlmsvc_unlock_all_by_ip(server_ip);
}
static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
{
/* request is:
* domain path maxsize
* response is
* filehandle
*
* qword quoting is used, so filehandle will be \x....
*/
char *dname, *path;
int uninitialized_var(maxsize);
char *mesg = buf;
int len;
struct auth_domain *dom;
struct knfsd_fh fh;
if (size == 0)
return -EINVAL;
if (buf[size-1] != '\n')
return -EINVAL;
buf[size-1] = 0;
dname = mesg;
len = qword_get(&mesg, dname, size);
if (len <= 0) return -EINVAL;
path = dname+len+1;
len = qword_get(&mesg, path, size);
if (len <= 0) return -EINVAL;
len = get_int(&mesg, &maxsize);
if (len)
return len;
if (maxsize < NFS_FHSIZE)
return -EINVAL;
if (maxsize > NFS3_FHSIZE)
maxsize = NFS3_FHSIZE;
if (qword_get(&mesg, mesg, size)>0)
return -EINVAL;
/* we have all the words, they are in buf.. */
dom = unix_domain_find(dname);
if (!dom)
return -ENOMEM;
len = exp_rootfh(dom, path, &fh, maxsize);
auth_domain_put(dom);
if (len)
return len;
mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
mesg[-1] = '\n';
return mesg - buf;
}
static ssize_t write_threads(struct file *file, char *buf, size_t size)
{
/* if size > 0, look for a number of threads and call nfsd_svc
* then write out number of threads as reply
*/
char *mesg = buf;
int rv;
if (size > 0) {
int newthreads;
rv = get_int(&mesg, &newthreads);
if (rv)
return rv;
if (newthreads <0)
return -EINVAL;
rv = nfsd_svc(2049, newthreads);
if (rv)
return rv;
}
sprintf(buf, "%d\n", nfsd_nrthreads());
return strlen(buf);
}
static ssize_t write_pool_threads(struct file *file, char *buf, size_t size)
{
/* if size > 0, look for an array of number of threads per node
* and apply them then write out number of threads per node as reply
*/
char *mesg = buf;
int i;
int rv;
int len;
int npools = nfsd_nrpools();
int *nthreads;
if (npools == 0) {
/*
* NFS is shut down. The admin can start it by
* writing to the threads file but NOT the pool_threads
* file, sorry. Report zero threads.
*/
strcpy(buf, "0\n");
return strlen(buf);
}
nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL);
if (nthreads == NULL)
return -ENOMEM;
if (size > 0) {
for (i = 0; i < npools; i++) {
rv = get_int(&mesg, &nthreads[i]);
if (rv == -ENOENT)
break; /* fewer numbers than pools */
if (rv)
goto out_free; /* syntax error */
rv = -EINVAL;
if (nthreads[i] < 0)
goto out_free;
}
rv = nfsd_set_nrthreads(i, nthreads);
if (rv)
goto out_free;
}
rv = nfsd_get_nrthreads(npools, nthreads);
if (rv)
goto out_free;
mesg = buf;
size = SIMPLE_TRANSACTION_LIMIT;
for (i = 0; i < npools && size > 0; i++) {
snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' '));
len = strlen(mesg);
size -= len;
mesg += len;
}
return (mesg-buf);
out_free:
kfree(nthreads);
return rv;
}
static ssize_t write_versions(struct file *file, char *buf, size_t size)
{
/*
* Format:
* [-/+]vers [-/+]vers ...
*/
char *mesg = buf;
char *vers, sign;
int len, num;
ssize_t tlen = 0;
char *sep;
if (size>0) {
if (nfsd_serv)
/* Cannot change versions without updating
* nfsd_serv->sv_xdrsize, and reallocing
* rq_argp and rq_resp
*/
return -EBUSY;
if (buf[size-1] != '\n')
return -EINVAL;
buf[size-1] = 0;
vers = mesg;
len = qword_get(&mesg, vers, size);
if (len <= 0) return -EINVAL;
do {
sign = *vers;
if (sign == '+' || sign == '-')
num = simple_strtol((vers+1), NULL, 0);
else
num = simple_strtol(vers, NULL, 0);
switch(num) {
case 2:
case 3:
case 4:
nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);
break;
default:
return -EINVAL;
}
vers += len + 1;
tlen += len;
} while ((len = qword_get(&mesg, vers, size)) > 0);
/* If all get turned off, turn them back on, as
* having no versions is BAD
*/
nfsd_reset_versions();
}
/* Now write current state into reply buffer */
len = 0;
sep = "";
for (num=2 ; num <= 4 ; num++)
if (nfsd_vers(num, NFSD_AVAIL)) {
len += sprintf(buf+len, "%s%c%d", sep,
nfsd_vers(num, NFSD_TEST)?'+':'-',
num);
sep = " ";
}
len += sprintf(buf+len, "\n");
return len;
}
static ssize_t write_ports(struct file *file, char *buf, size_t size)
{
if (size == 0) {
int len = 0;
lock_kernel();
if (nfsd_serv)
len = svc_xprt_names(nfsd_serv, buf, 0);
unlock_kernel();
return len;
}
/* Either a single 'fd' number is written, in which
* case it must be for a socket of a supported family/protocol,
* and we use it as an nfsd socket, or
* A '-' followed by the 'name' of a socket in which case
* we close the socket.
*/
if (isdigit(buf[0])) {
char *mesg = buf;
int fd;
int err;
err = get_int(&mesg, &fd);
if (err)
return -EINVAL;
if (fd < 0)
return -EINVAL;
err = nfsd_create_serv();
if (!err) {
int proto = 0;
err = svc_addsock(nfsd_serv, fd, buf, &proto);
if (err >= 0) {
err = lockd_up(proto);
if (err < 0)
svc_sock_names(buf+strlen(buf)+1, nfsd_serv, buf);
}
/* Decrease the count, but don't shutdown the
* the service
*/
lock_kernel();
nfsd_serv->sv_nrthreads--;
unlock_kernel();
}
return err < 0 ? err : 0;
}
if (buf[0] == '-' && isdigit(buf[1])) {
char *toclose = kstrdup(buf+1, GFP_KERNEL);
int len = 0;
if (!toclose)
return -ENOMEM;
lock_kernel();
if (nfsd_serv)
len = svc_sock_names(buf, nfsd_serv, toclose);
unlock_kernel();
if (len >= 0)
lockd_down();
kfree(toclose);
return len;
}
/*
* Add a transport listener by writing it's transport name
*/
if (isalpha(buf[0])) {
int err;
char transport[16];
int port;
if (sscanf(buf, "%15s %4d", transport, &port) == 2) {
err = nfsd_create_serv();
if (!err) {
err = svc_create_xprt(nfsd_serv,
transport, port,
SVC_SOCK_ANONYMOUS);
if (err == -ENOENT)
/* Give a reasonable perror msg for
* bad transport string */
err = -EPROTONOSUPPORT;
}
return err < 0 ? err : 0;
}
}
/*
* Remove a transport by writing it's transport name and port number
*/
if (buf[0] == '-' && isalpha(buf[1])) {
struct svc_xprt *xprt;
int err = -EINVAL;
char transport[16];
int port;
if (sscanf(&buf[1], "%15s %4d", transport, &port) == 2) {
if (port == 0)
return -EINVAL;
lock_kernel();
if (nfsd_serv) {
xprt = svc_find_xprt(nfsd_serv, transport,
AF_UNSPEC, port);
if (xprt) {
svc_close_xprt(xprt);
svc_xprt_put(xprt);
err = 0;
} else
err = -ENOTCONN;
}
unlock_kernel();
return err < 0 ? err : 0;
}
}
return -EINVAL;
}
int nfsd_max_blksize;
static ssize_t write_maxblksize(struct file *file, char *buf, size_t size)
{
char *mesg = buf;
if (size > 0) {
int bsize;
int rv = get_int(&mesg, &bsize);
if (rv)
return rv;
/* force bsize into allowed range and
* required alignment.
*/
if (bsize < 1024)
bsize = 1024;
if (bsize > NFSSVC_MAXBLKSIZE)
bsize = NFSSVC_MAXBLKSIZE;
bsize &= ~(1024-1);
lock_kernel();
if (nfsd_serv && nfsd_serv->sv_nrthreads) {
unlock_kernel();
return -EBUSY;
}
nfsd_max_blksize = bsize;
unlock_kernel();
}
return sprintf(buf, "%d\n", nfsd_max_blksize);
}
#ifdef CONFIG_NFSD_V4
extern time_t nfs4_leasetime(void);
static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
{
/* if size > 10 seconds, call
* nfs4_reset_lease() then write out the new lease (seconds) as reply
*/
char *mesg = buf;
int rv;
if (size > 0) {
int lease;
rv = get_int(&mesg, &lease);
if (rv)
return rv;
if (lease < 10 || lease > 3600)
return -EINVAL;
nfs4_reset_lease(lease);
}
sprintf(buf, "%ld\n", nfs4_lease_time());
return strlen(buf);
}
static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
{
char *mesg = buf;
char *recdir;
int len, status;
if (size == 0 || size > PATH_MAX || buf[size-1] != '\n')
return -EINVAL;
buf[size-1] = 0;
recdir = mesg;
len = qword_get(&mesg, recdir, size);
if (len <= 0)
return -EINVAL;
status = nfs4_reset_recoverydir(recdir);
return strlen(buf);
}
#endif
/*----------------------------------------------------------------------------*/
/*
* populating the filesystem.
*/
static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
{
static struct tree_descr nfsd_files[] = {
[NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
[NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
[NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
[NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
[NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
[NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_List] = {"exports", &exports_operations, S_IRUGO},
lockd: unlock lockd locks associated with a given server ip For high-availability NFS service, we generally need to be able to drop file locks held on the exported filesystem before moving clients to a new server. Currently the only way to do that is by shutting down lockd entirely, which is often undesireable (for example, if you want to continue exporting other filesystems). This patch allows the administrator to release all locks held by clients accessing the client through a given server ip address, by echoing that address to a new file, /proc/fs/nfsd/unlock_ip, as in: shell> echo 10.1.1.2 > /proc/fs/nfsd/unlock_ip The expected sequence of events can be: 1. Tear down the IP address 2. Unexport the path 3. Write IP to /proc/fs/nfsd/unlock_ip to unlock files 4. Signal peer to begin take-over. For now we only support IPv4 addresses and NFSv2/v3 (NFSv4 locks are not affected). Also, if unmounting the filesystem is required, we assume at step 3 that clients using the given server ip are the only clients holding locks on the given filesystem; otherwise, an additional patch is required to allow revoking all locks held by lockd on a given filesystem. Signed-off-by: S. Wendy Cheng <wcheng@redhat.com> Cc: Lon Hohberger <lhh@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> fs/lockd/svcsubs.c | 66 +++++++++++++++++++++++++++++++++++++++----- fs/nfsd/nfsctl.c | 65 +++++++++++++++++++++++++++++++++++++++++++ include/linux/lockd/lockd.h | 7 ++++ 3 files changed, 131 insertions(+), 7 deletions(-)
2008-01-17 16:10:12 +00:00
[NFSD_FO_UnlockIP] = {"unlock_ip",
&transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO},
[NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO},
#ifdef CONFIG_NFSD_V4
[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
#endif
/* last one */ {""}
};
return simple_fill_super(sb, 0x6e667364, nfsd_files);
}
[PATCH] VFS: Permit filesystem to override root dentry on mount Extend the get_sb() filesystem operation to take an extra argument that permits the VFS to pass in the target vfsmount that defines the mountpoint. The filesystem is then required to manually set the superblock and root dentry pointers. For most filesystems, this should be done with simple_set_mnt() which will set the superblock pointer and then set the root dentry to the superblock's s_root (as per the old default behaviour). The get_sb() op now returns an integer as there's now no need to return the superblock pointer. This patch permits a superblock to be implicitly shared amongst several mount points, such as can be done with NFS to avoid potential inode aliasing. In such a case, simple_set_mnt() would not be called, and instead the mnt_root and mnt_sb would be set directly. The patch also makes the following changes: (*) the get_sb_*() convenience functions in the core kernel now take a vfsmount pointer argument and return an integer, so most filesystems have to change very little. (*) If one of the convenience function is not used, then get_sb() should normally call simple_set_mnt() to instantiate the vfsmount. This will always return 0, and so can be tail-called from get_sb(). (*) generic_shutdown_super() now calls shrink_dcache_sb() to clean up the dcache upon superblock destruction rather than shrink_dcache_anon(). This is required because the superblock may now have multiple trees that aren't actually bound to s_root, but that still need to be cleaned up. The currently called functions assume that the whole tree is rooted at s_root, and that anonymous dentries are not the roots of trees which results in dentries being left unculled. However, with the way NFS superblock sharing are currently set to be implemented, these assumptions are violated: the root of the filesystem is simply a dummy dentry and inode (the real inode for '/' may well be inaccessible), and all the vfsmounts are rooted on anonymous[*] dentries with child trees. [*] Anonymous until discovered from another tree. (*) The documentation has been adjusted, including the additional bit of changing ext2_* into foo_* in the documentation. [akpm@osdl.org: convert ipath_fs, do other stuff] Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Cc: Nathan Scott <nathans@sgi.com> Cc: Roland Dreier <rolandd@cisco.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-23 09:02:57 +00:00
static int nfsd_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
[PATCH] VFS: Permit filesystem to override root dentry on mount Extend the get_sb() filesystem operation to take an extra argument that permits the VFS to pass in the target vfsmount that defines the mountpoint. The filesystem is then required to manually set the superblock and root dentry pointers. For most filesystems, this should be done with simple_set_mnt() which will set the superblock pointer and then set the root dentry to the superblock's s_root (as per the old default behaviour). The get_sb() op now returns an integer as there's now no need to return the superblock pointer. This patch permits a superblock to be implicitly shared amongst several mount points, such as can be done with NFS to avoid potential inode aliasing. In such a case, simple_set_mnt() would not be called, and instead the mnt_root and mnt_sb would be set directly. The patch also makes the following changes: (*) the get_sb_*() convenience functions in the core kernel now take a vfsmount pointer argument and return an integer, so most filesystems have to change very little. (*) If one of the convenience function is not used, then get_sb() should normally call simple_set_mnt() to instantiate the vfsmount. This will always return 0, and so can be tail-called from get_sb(). (*) generic_shutdown_super() now calls shrink_dcache_sb() to clean up the dcache upon superblock destruction rather than shrink_dcache_anon(). This is required because the superblock may now have multiple trees that aren't actually bound to s_root, but that still need to be cleaned up. The currently called functions assume that the whole tree is rooted at s_root, and that anonymous dentries are not the roots of trees which results in dentries being left unculled. However, with the way NFS superblock sharing are currently set to be implemented, these assumptions are violated: the root of the filesystem is simply a dummy dentry and inode (the real inode for '/' may well be inaccessible), and all the vfsmounts are rooted on anonymous[*] dentries with child trees. [*] Anonymous until discovered from another tree. (*) The documentation has been adjusted, including the additional bit of changing ext2_* into foo_* in the documentation. [akpm@osdl.org: convert ipath_fs, do other stuff] Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Cc: Nathan Scott <nathans@sgi.com> Cc: Roland Dreier <rolandd@cisco.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-23 09:02:57 +00:00
return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
}
static struct file_system_type nfsd_fs_type = {
.owner = THIS_MODULE,
.name = "nfsd",
.get_sb = nfsd_get_sb,
.kill_sb = kill_litter_super,
};
#ifdef CONFIG_PROC_FS
static int create_proc_exports_entry(void)
{
struct proc_dir_entry *entry;
entry = proc_mkdir("fs/nfs", NULL);
if (!entry)
return -ENOMEM;
entry = create_proc_entry("fs/nfs/exports", 0, NULL);
if (!entry)
return -ENOMEM;
entry->proc_fops = &exports_operations;
return 0;
}
#else /* CONFIG_PROC_FS */
static int create_proc_exports_entry(void)
{
return 0;
}
#endif
static int __init init_nfsd(void)
{
int retval;
printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
retval = nfs4_state_init(); /* nfs4 locking state */
if (retval)
return retval;
nfsd_stat_init(); /* Statistics */
retval = nfsd_reply_cache_init();
if (retval)
goto out_free_stat;
retval = nfsd_export_init();
if (retval)
goto out_free_cache;
nfsd_lockd_init(); /* lockd->nfsd callbacks */
retval = nfsd_idmap_init();
if (retval)
goto out_free_lockd;
retval = create_proc_exports_entry();
if (retval)
goto out_free_idmap;
retval = register_filesystem(&nfsd_fs_type);
if (retval)
goto out_free_all;
return 0;
out_free_all:
remove_proc_entry("fs/nfs/exports", NULL);
remove_proc_entry("fs/nfs", NULL);
out_free_idmap:
nfsd_idmap_shutdown();
out_free_lockd:
nfsd_lockd_shutdown();
nfsd_export_shutdown();
out_free_cache:
nfsd_reply_cache_shutdown();
out_free_stat:
nfsd_stat_shutdown();
nfsd4_free_slabs();
return retval;
}
static void __exit exit_nfsd(void)
{
nfsd_export_shutdown();
nfsd_reply_cache_shutdown();
remove_proc_entry("fs/nfs/exports", NULL);
remove_proc_entry("fs/nfs", NULL);
nfsd_stat_shutdown();
nfsd_lockd_shutdown();
nfsd_idmap_shutdown();
nfsd4_free_slabs();
unregister_filesystem(&nfsd_fs_type);
}
MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
MODULE_LICENSE("GPL");
module_init(init_nfsd)
module_exit(exit_nfsd)