Ok, I played around with this and cleaned up the ip/path codepathes to
be entirely setup which helped the code quite a bit. Also a few other
cleanups and two bugfixes (postive error code returned and missing
path_release) fell out of it. I still don't like what's going on in
fs/lockd/svcsubs.c, it would be much better if the cluster unlock code
simply didn't use nlm_traverse_files but did it's own loop over
the nlm hosts. That should also absolete the second patch.
Index: linux-2.6/fs/nfsd/nfsctl.c
===================================================================
--- linux-2.6.orig/fs/nfsd/nfsctl.c 2008-01-08 18:36:37.000000000 +0100
+++ linux-2.6/fs/nfsd/nfsctl.c 2008-01-08 18:45:55.000000000 +0100
@@ -22,6 +22,7 @@
#include <linux/seq_file.h>
#include <linux/pagemap.h>
#include <linux/init.h>
+#include <linux/inet.h>
#include <linux/string.h>
#include <linux/smp_lock.h>
#include <linux/ctype.h>
@@ -35,6 +36,7 @@
#include <linux/nfsd/cache.h>
#include <linux/nfsd/xdr.h>
#include <linux/nfsd/syscall.h>
+#include <linux/lockd/lockd.h>
#include <asm/uaccess.h>
@@ -52,6 +54,8 @@ enum {
NFSD_Getfs,
NFSD_List,
NFSD_Fh,
+ NFSD_FO_UnlockIP,
+ NFSD_FO_UnlockFS,
NFSD_Threads,
NFSD_Pool_Threads,
NFSD_Versions,
@@ -88,6 +92,9 @@ static ssize_t write_leasetime(struct fi
static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
#endif
+static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size);
+static ssize_t failover_unlock_fs(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,
@@ -97,6 +104,8 @@ static ssize_t (*write_op[])(struct file
[NFSD_Getfd] = write_getfd,
[NFSD_Getfs] = write_getfs,
[NFSD_Fh] = write_filehandle,
+ [NFSD_FO_UnlockIP] = failover_unlock_ip,
+ [NFSD_FO_UnlockFS] = failover_unlock_fs,
[NFSD_Threads] = write_threads,
[NFSD_Pool_Threads] = write_pool_threads,
[NFSD_Versions] = write_versions,
@@ -288,6 +297,55 @@ static ssize_t write_getfd(struct file *
return err;
}
+static ssize_t failover_unlock_ip(struct file *file, char *buf, size_t size)
+{
+ __be32 server_ip;
+ char *fo_path;
+ char *mesg;
+
+ /* sanity check */
+ if (size <= 0)
+ return -EINVAL;
+
+ if (buf[size-1] == '\n')
+ buf[size-1] = 0;
+
+ fo_path = mesg = buf;
+ if (qword_get(&mesg, fo_path, size) < 0)
+ return -EINVAL;
+
+ server_ip = in_aton(fo_path);
+ return nlmsvc_failover_ip(server_ip[0]);
+}
+
+static ssize_t failover_unlock_fs(struct file *file, char *buf, size_t size)
+{
+ struct nameidata nd;
+ char *fo_path;
+ char *mesg;
+ int error;
+
+ /* sanity check */
+ if (size <= 0)
+ return -EINVAL;
+
+ if (buf[size-1] == '\n')
+ buf[size-1] = 0;
+
+ fo_path = mesg = buf;
+ if (qword_get(&mesg, fo_path, size) < 0)
+ return -EINVAL;
+
+ error = path_lookup(fo_path, 0, &nd);
+ if (error)
+ return error;
+
+ error = nlmsvc_failover_path(&nd);
+
+ path_release(&nd);
+ return error;
+}
+
static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
{
/* request is:
@@ -646,6 +704,8 @@ static int nfsd_fill_super(struct super_
[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},
+ [NFSD_FO_UnlockIP] = {"unlock_ip", &transaction_ops,
S_IWUSR|S_IRUSR},
+ [NFSD_FO_UnlockFS] = {"unlock_filesystem", &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},
Index: linux-2.6/fs/lockd/svcsubs.c
===================================================================
--- linux-2.6.orig/fs/lockd/svcsubs.c 2008-01-08 18:36:37.000000000 +0100
+++ linux-2.6/fs/lockd/svcsubs.c 2008-01-08 18:44:11.000000000 +0100
@@ -18,6 +18,8 @@
#include <linux/lockd/lockd.h>
#include <linux/lockd/share.h>
#include <linux/lockd/sm_inter.h>
+#include <linux/module.h>
+#include <linux/mount.h>
#define NLMDBG_FACILITY NLMDBG_SVCSUBS
@@ -87,7 +89,7 @@ nlm_lookup_file(struct svc_rqst *rqstp,
unsigned int hash;
__be32 nfserr;
- nlm_debug_print_fh("nlm_file_lookup", f);
+ nlm_debug_print_fh("nlm_lookup_file", f);
hash = file_hash(f);
@@ -123,6 +125,9 @@ nlm_lookup_file(struct svc_rqst *rqstp,
hlist_add_head(&file->f_list, &nlm_files[hash]);
+ /* fill in f_iaddr for nlm lock failover */
+ file->f_iaddr = rqstp->rq_daddr;
+
found:
dprintk("lockd: found file %p (count %d)\n", file, file->f_count);
*result = file;
@@ -194,12 +199,63 @@ again:
return 0;
}
+static int
+nlmsvc_fo_unlock_match_path(void *datap, struct nlm_file *file)
+{
+ struct nameidata *nd = datap;
+ return nd->mnt == file->f_file->f_path.mnt;
+}
+
+static int
+nlmsvc_fo_unlock_match_ip(void *datap, struct nlm_file *file)
+{
+ struct in_addr *in = datap;
+
+ return file->f_iaddr.addr.s_addr == in->s_addr;
+}
+
+/*
+ * To fit the logic into current lockd code structure, we add a
+ * little wrapper function here. The real matching task should be
+ * carried out by nlm_fo_check_fsid().
+ */
+
+static int nlmsvc_fo_match_path(struct nlm_host *dummy1,
+ struct nlm_host *dummy2)
+{
+ return 1;
+}
+
+static int nlmsvc_fo_match_ip(struct nlm_host *dummy1, struct nlm_host *dummy2)
+{
+ return 1;
+}
+
/*
* Inspect a single file
*/
static inline int
nlm_inspect_file(struct nlm_host *host, struct nlm_file *file,
nlm_host_match_fn_t match)
{
+ /*
+ * Cluster failover has timing constraints. There is a slight
+ * performance hit if nlm_fo_unlock_match() is implemented as
+ * a match fn (since it will be invoked for each block, share,
+ * and lock later when the lists are traversed). Instead, we
+ * add path-matching logic into the following unlikely clause.
+ * If matches, the dummy nlmsvc_fo_match will always return
+ * true.
+ */
+ dprintk("nlm_inspect_files: file=%p\n", file);
+ if (unlikely(match == nlmsvc_fo_match_path)) {
+ if (!nlmsvc_fo_unlock_match_path(host, file))
+ return 0;
+ }
+ if (unlikely(match == nlmsvc_fo_match_ip)) {
+ if (!nlmsvc_fo_unlock_match_ip(host, file))
+ return 0;
+ }
+
nlmsvc_traverse_blocks(host, file, match);
nlmsvc_traverse_shares(host, file, match);
return nlm_traverse_locks(host, file, match);
@@ -370,3 +426,22 @@ nlmsvc_invalidate_all(void)
*/
nlm_traverse_files(NULL, nlmsvc_is_client);
}
+
+/*
+ * Release locks associated with an export fsid upon failover
+ * invoked via nfsd nfsctl call (write_fo_unlock).
+ */
+int
+nlmsvc_failover_path(struct nameidata *nd)
+{
+ return nlm_traverse_files((struct nlm_host*)nd, nlmsvc_fo_match_path);
+}
+EXPORT_SYMBOL_GPL(nlmsvc_failover_path);
+
+int
+nlmsvc_failover_ip(__be32 server_addr)
+{
+ return nlm_traverse_files((struct nlm_host *)&server_addr,
+ nlmsvc_fo_match_ip);
+}
+EXPORT_SYMBOL_GPL(nlmsvc_failover_ip);
Index: linux-2.6/include/linux/lockd/lockd.h
===================================================================
--- linux-2.6.orig/include/linux/lockd/lockd.h 2008-01-08 18:36:37.000000000
+0100
+++ linux-2.6/include/linux/lockd/lockd.h 2008-01-08 18:44:44.000000000
+0100
@@ -113,6 +113,7 @@ struct nlm_file {
unsigned int f_locks; /* guesstimate # of locks */
unsigned int f_count; /* reference count */
struct mutex f_mutex; /* avoid concurrent access */
+ union svc_addr_u f_iaddr; /* server ip for failover */
};
/*
@@ -214,6 +215,12 @@ void nlmsvc_mark_resources(void);
void nlmsvc_free_host_resources(struct nlm_host *);
void nlmsvc_invalidate_all(void);
+/*
+ * Cluster failover support
+ */
+int nlmsvc_failover_path(struct nameidata *nd);
+int nlmsvc_failover_ip(__be32 server_addr);
+
static __inline__ struct inode *
nlmsvc_file_inode(struct nlm_file *file)
{
