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-rw-r--r--fs/nfsd/nfsctl.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 4e042105fb6e..ca73ca79a0ee 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -49,6 +49,7 @@ enum {
NFSD_Leasetime,
NFSD_Gracetime,
NFSD_RecoveryDir,
+ NFSD_V4EndGrace,
#endif
};
@@ -68,6 +69,7 @@ static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
+static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
#endif
static ssize_t (*write_op[])(struct file *, char *, size_t) = {
@@ -84,6 +86,7 @@ static ssize_t (*write_op[])(struct file *, char *, size_t) = {
[NFSD_Leasetime] = write_leasetime,
[NFSD_Gracetime] = write_gracetime,
[NFSD_RecoveryDir] = write_recoverydir,
+ [NFSD_V4EndGrace] = write_v4_end_grace,
#endif
};
@@ -1077,6 +1080,47 @@ static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
return rv;
}
+/**
+ * write_v4_end_grace - release grace period for nfsd's v4.x lock manager
+ *
+ * Input:
+ * buf: ignored
+ * size: zero
+ * OR
+ *
+ * Input:
+ * buf: any value
+ * size: non-zero length of C string in @buf
+ * Output:
+ * passed-in buffer filled with "Y" or "N" with a newline
+ * and NULL-terminated C string. This indicates whether
+ * the grace period has ended in the current net
+ * namespace. Return code is the size in bytes of the
+ * string. Writing a string that starts with 'Y', 'y', or
+ * '1' to the file will end the grace period for nfsd's v4
+ * lock manager.
+ */
+static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
+{
+ struct net *net = file->f_dentry->d_sb->s_fs_info;
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+
+ if (size > 0) {
+ switch(buf[0]) {
+ case 'Y':
+ case 'y':
+ case '1':
+ nfsd4_end_grace(nn);
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n",
+ nn->grace_ended ? 'Y' : 'N');
+}
+
#endif
/*----------------------------------------------------------------------------*/
@@ -1110,6 +1154,7 @@ static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
[NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
+ [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO},
#endif
/* last one */ {""}
};