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authorJeff Layton <jlayton@primarydata.com>2014-09-12 16:40:21 -0400
committerJ. Bruce Fields <bfields@redhat.com>2014-09-17 16:33:14 -0400
commit7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 (patch)
treede3eb667a4b70e6534e603af7a076f4cce57815d /fs/nfsd/nfsctl.c
parentd68e3c4aa416d592d79152a49af121e4ecb204e3 (diff)
downloadop-kernel-dev-7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6.zip
op-kernel-dev-7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6.tar.gz
nfsd: add a v4_end_grace file to /proc/fs/nfsd
Allow a privileged userland process to end the v4 grace period early. Writing "Y", "y", or "1" to the file will cause the v4 grace period to be lifted. The basic idea with this will be to allow the userland client tracking program to lift the grace period once it knows that no more clients will be reclaiming state. Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Diffstat (limited to 'fs/nfsd/nfsctl.c')
-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 4e04210..ca73ca7 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 */ {""}
};
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