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-rw-r--r--fs/nfs/namespace.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index db6aa36..78c0ebb 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -49,11 +49,17 @@ char *nfs_path(const char *base,
const struct dentry *dentry,
char *buffer, ssize_t buflen)
{
- char *end = buffer+buflen;
+ char *end;
int namelen;
+ unsigned seq;
+rename_retry:
+ end = buffer+buflen;
*--end = '\0';
buflen--;
+
+ seq = read_seqbegin(&rename_lock);
+ rcu_read_lock();
spin_lock(&dcache_lock);
while (!IS_ROOT(dentry) && dentry != droot) {
namelen = dentry->d_name.len;
@@ -66,6 +72,9 @@ char *nfs_path(const char *base,
dentry = dentry->d_parent;
}
spin_unlock(&dcache_lock);
+ rcu_read_unlock();
+ if (read_seqretry(&rename_lock, seq))
+ goto rename_retry;
if (*end != '/') {
if (--buflen < 0)
goto Elong;
@@ -83,6 +92,9 @@ char *nfs_path(const char *base,
return end;
Elong_unlock:
spin_unlock(&dcache_lock);
+ rcu_read_unlock();
+ if (read_seqretry(&rename_lock, seq))
+ goto rename_retry;
Elong:
return ERR_PTR(-ENAMETOOLONG);
}
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