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lockd: Pass "struct sockaddr *" to new failover-by-IP function 

Pass a more generic socket address type to nlmsvc_unlock_all_by_ip() to
allow for future support of IPv6.  Also provide additional sanity
checking in failover_unlock_ip() when constructing the server's IP
address.

As an added bonus, provide clean kerneldoc comments on related NLM
interfaces which were recently added.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Chuck Lever 2008-06-30 18:58:14 -04:00 committed by J. Bruce Fields
parent 560de0e659
commit 367c8c7bd9
3 changed files with 34 additions and 15 deletions
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32
fs/lockd/svcsubs.c
View File

@ -373,13 +373,16 @@ nlmsvc_free_host_resources(struct nlm_host *host)
}
}
/*
* Remove all locks held for clients
/**
* nlmsvc_invalidate_all - remove all locks held for clients
*
* Release all locks held by NFS clients.
*
*/
void
nlmsvc_invalidate_all(void)
{
/* Release all locks held by NFS clients.
/*
* Previously, the code would call
* nlmsvc_free_host_resources for each client in
* turn, which is about as inefficient as it gets.
@ -396,6 +399,12 @@ nlmsvc_match_sb(void *datap, struct nlm_file *file)
return sb == file->f_file->f_path.mnt->mnt_sb;
}
/**
* nlmsvc_unlock_all_by_sb - release locks held on this file system
* @sb: super block
*
* Release all locks held by clients accessing this file system.
*/
int
nlmsvc_unlock_all_by_sb(struct super_block *sb)
{
@ -409,17 +418,22 @@ EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_sb);
static int
nlmsvc_match_ip(void *datap, struct nlm_host *host)
{
__be32 *server_addr = datap;
return host->h_saddr.sin_addr.s_addr == *server_addr;
return nlm_cmp_addr(&host->h_saddr, datap);
}
/**
* nlmsvc_unlock_all_by_ip - release local locks by IP address
* @server_addr: server's IP address as seen by clients
*
* Release all locks held by clients accessing this host
* via the passed in IP address.
*/
int
nlmsvc_unlock_all_by_ip(__be32 server_addr)
nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr)
{
int ret;
ret = nlm_traverse_files(&server_addr, nlmsvc_match_ip, NULL);
return ret ? -EIO : 0;
ret = nlm_traverse_files(server_addr, nlmsvc_match_ip, NULL);
return ret ? -EIO : 0;
}
EXPORT_SYMBOL_GPL(nlmsvc_unlock_all_by_ip);

15
fs/nfsd/nfsctl.c
View File

@ -310,9 +310,12 @@ static ssize_t write_getfd(struct file *file, char *buf, size_t size)
static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size)
{
__be32 server_ip;
char *fo_path, c;
struct sockaddr_in sin = {
.sin_family = AF_INET,
};
int b1, b2, b3, b4;
char c;
char *fo_path;
/* sanity check */
if (size == 0)
@ -326,11 +329,13 @@ static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size)
return -EINVAL;
/* get ipv4 address */
if (sscanf(fo_path, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
if (sscanf(fo_path, NIPQUAD_FMT "%c", &b1, &b2, &b3, &b4, &c) != 4)
return -EINVAL;
server_ip = htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
if (b1 > 255 || b2 > 255 || b3 > 255 || b4 > 255)
return -EINVAL;
sin.sin_addr.s_addr = htonl((b1 << 24) | (b2 << 16) | (b3 << 8) | b4);
return nlmsvc_unlock_all_by_ip(server_ip);
return nlmsvc_unlock_all_by_ip((struct sockaddr *)&sin);
}
static ssize_t failover_unlock_fs(struct file *file, char *buf, size_t size)

2
include/linux/lockd/lockd.h
View File

@ -226,7 +226,7 @@ void nlmsvc_invalidate_all(void);
* Cluster failover support
*/
int nlmsvc_unlock_all_by_sb(struct super_block *sb);
int nlmsvc_unlock_all_by_ip(__be32 server_addr);
int nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr);
static inline struct inode *nlmsvc_file_inode(struct nlm_file *file)
{