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 <[email protected]>
---
fs/lockd/svcsubs.c | 39 +++++++++++++++++++++++++--------------
fs/nfsd/nfsctl.c | 15 ++++++++++-----
include/linux/lockd/lockd.h | 2 +-
3 files changed, 36 insertions(+), 20 deletions(-)
diff --git a/fs/lockd/svcsubs.c b/fs/lockd/svcsubs.c
index d1c48b5..723b6d5 100644
--- a/fs/lockd/svcsubs.c
+++ b/fs/lockd/svcsubs.c
@@ -373,18 +373,18 @@ 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. Previously, the code
+ * would call nlmsvc_free_host_resources for each client in turn,
+ * which is about as inefficient as it gets.
+ *
+ * Now we just do it once in nlm_traverse_files.
*/
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.
- * Now we just do it once in nlm_traverse_files.
- */
nlm_traverse_files(NULL, nlmsvc_is_client, NULL);
}
@@ -396,6 +396,12 @@ 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 +415,22 @@ 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);
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 5ac00c4..5b4a412 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -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;
+ if (b1 > 255 || b2 > 255 || b3 > 255 || b4 > 255)
return -EINVAL;
- server_ip = htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
+ 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)
diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h
index 102d928..a6d1215 100644
--- a/include/linux/lockd/lockd.h
+++ b/include/linux/lockd/lockd.h
@@ -224,7 +224,7 @@ 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)
{