[PATCH] knfsd: nfsd4 reboot dirname fix

Set the recovery directory via /proc/fs/nfsd/nfs4recoverydir.

It may be changed any time, but is used only on startup.

Signed-off-by: Andy Adamson <andros@citi.umich.edu>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 58 insertions, 3 deletions

diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index 2805c5245eac..095f1740f3ae 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -50,7 +50,6 @@
 #define NFSDDBG_FACILITY                NFSDDBG_PROC
 
 /* Globals */
-char recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
 static struct nameidata rec_dir;
 static int rec_dir_init = 0;
 
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 6cca358cd650..89e36526d7f2 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -48,6 +48,7 @@
 #include <linux/nfs4.h>
 #include <linux/nfsd/state.h>
 #include <linux/nfsd/xdr4.h>
+#include <linux/namei.h>
 
 #define NFSDDBG_FACILITY                NFSDDBG_PROC
 
@@ -71,7 +72,8 @@ static stateid_t onestateid;              /* bits all 1 */
 static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
 static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
-extern char recovery_dirname[];
+static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
+static void nfs4_set_recdir(char *recdir);
 
 /* Locking:
  *
@@ -3224,8 +3226,10 @@ nfsd4_load_reboot_recovery_data(void)
 {
         int status;
 
-        nfsd4_init_recdir(recovery_dirname);
+        nfs4_lock_state();
+        nfsd4_init_recdir(user_recovery_dirname);
         status = nfsd4_recdir_load();
+        nfs4_unlock_state();
         if (status)
                 printk("NFSD: Failure reading reboot recovery data\n");
 }
@@ -3329,6 +3333,35 @@ nfs4_state_shutdown(void)
         nfs4_unlock_state();
 }
 
+static void
+nfs4_set_recdir(char *recdir)
+{
+        nfs4_lock_state();
+        strcpy(user_recovery_dirname, recdir);
+        nfs4_unlock_state();
+}
+
+/*
+ * Change the NFSv4 recovery directory to recdir.
+ */
+int
+nfs4_reset_recoverydir(char *recdir)
+{
+        int status;
+        struct nameidata nd;
+
+        status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
+        if (status)
+                return status;
+        status = -ENOTDIR;
+        if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
+                nfs4_set_recdir(recdir);
+                status = 0;
+        }
+        path_release(&nd);
+        return status;
+}
+
 /*
  * Called when leasetime is changed.
  *
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 3da43a3ed32c..841c562991e8 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -51,6 +51,7 @@ enum {
         NFSD_Fh,
         NFSD_Threads,
         NFSD_Leasetime,
+        NFSD_RecoveryDir,
 };
 
 /*
@@ -66,6 +67,7 @@ static ssize_t write_getfs(struct file *file, char *buf, size_t size);
 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
 static ssize_t write_threads(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_recoverydir(struct file *file, char *buf, size_t size);
 
 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
         [NFSD_Svc] = write_svc,
@@ -78,6 +80,7 @@ static ssize_t (*write_op[])(struct file *, char *, size_t) = {
         [NFSD_Fh] = write_filehandle,
         [NFSD_Threads] = write_threads,
         [NFSD_Leasetime] = write_leasetime,
+        [NFSD_RecoveryDir] = write_recoverydir,
 };
 
 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
@@ -349,6 +352,25 @@ static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
         return strlen(buf);
 }
 
+static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
+{
+        char *mesg = buf;
+        char *recdir;
+        int len, status;
+
+        if (size > PATH_MAX || buf[size-1] != '\n')
+                return -EINVAL;
+        buf[size-1] = 0;
+
+        recdir = mesg;
+        len = qword_get(&mesg, recdir, size);
+        if (len <= 0)
+                return -EINVAL;
+
+        status = nfs4_reset_recoverydir(recdir);
+        return strlen(buf);
+}
+
 /*----------------------------------------------------------------------------*/
 /*
  *      populating the filesystem.
@@ -369,6 +391,7 @@ static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
 #ifdef CONFIG_NFSD_V4
                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
+                [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
 #endif
                 /* last one */ {""}
         };