nfsd: new interface to advertise export features
Soon we will add the new V4ROOT flag, and allow the INSECURE flag to
vary by pseudoflavor. It would be useful for nfs-utils (for example,
for improved exportfs error reporting) to be able to know when this
happens. Use this new interface for that purpose.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 0415680..e7051ac 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -31,6 +31,7 @@
NFSD_Getfd,
NFSD_Getfs,
NFSD_List,
+ NFSD_Export_features,
NFSD_Fh,
NFSD_FO_UnlockIP,
NFSD_FO_UnlockFS,
@@ -149,6 +150,24 @@
.owner = THIS_MODULE,
};
+static int export_features_show(struct seq_file *m, void *v)
+{
+ seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS);
+ return 0;
+}
+
+static int export_features_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, export_features_show, NULL);
+}
+
+static struct file_operations export_features_operations = {
+ .open = export_features_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
@@ -1306,6 +1325,8 @@
[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_Export_features] = {"export_features",
+ &export_features_operations, S_IRUGO},
[NFSD_FO_UnlockIP] = {"unlock_ip",
&transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_FO_UnlockFS] = {"unlock_filesystem",
diff --git a/include/linux/nfsd/export.h b/include/linux/nfsd/export.h
index ef3d416..4f1df1d 100644
--- a/include/linux/nfsd/export.h
+++ b/include/linux/nfsd/export.h
@@ -39,7 +39,8 @@
#define NFSEXP_FSID 0x2000
#define NFSEXP_CROSSMOUNT 0x4000
#define NFSEXP_NOACL 0x8000 /* reserved for possible ACL related use */
-#define NFSEXP_ALLFLAGS 0xFE3F
+/* All flags that we claim to support. (Note we don't support NOACL.) */
+#define NFSEXP_ALLFLAGS 0x7E3F
/* The flags that may vary depending on security flavor: */
#define NFSEXP_SECINFO_FLAGS (NFSEXP_READONLY | NFSEXP_ROOTSQUASH \
