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Diffstat (limited to 'fs/dcache.c')
-rw-r--r--fs/dcache.c17
1 files changed, 12 insertions, 5 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index 6055d61811d3..265e0ce9769c 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -3061,8 +3061,13 @@ char *d_path(const struct path *path, char *buf, int buflen)
* thus don't need to be hashed. They also don't need a name until a
* user wants to identify the object in /proc/pid/fd/. The little hack
* below allows us to generate a name for these objects on demand:
+ *
+ * Some pseudo inodes are mountable. When they are mounted
+ * path->dentry == path->mnt->mnt_root. In that case don't call d_dname
+ * and instead have d_path return the mounted path.
*/
- if (path->dentry->d_op && path->dentry->d_op->d_dname)
+ if (path->dentry->d_op && path->dentry->d_op->d_dname &&
+ (!IS_ROOT(path->dentry) || path->dentry != path->mnt->mnt_root))
return path->dentry->d_op->d_dname(path->dentry, buf, buflen);
rcu_read_lock();
@@ -3111,26 +3116,28 @@ char *simple_dname(struct dentry *dentry, char *buffer, int buflen)
/*
* Write full pathname from the root of the filesystem into the buffer.
*/
-static char *__dentry_path(struct dentry *dentry, char *buf, int buflen)
+static char *__dentry_path(struct dentry *d, char *buf, int buflen)
{
+ struct dentry *dentry;
char *end, *retval;
int len, seq = 0;
int error = 0;
+ if (buflen < 2)
+ goto Elong;
+
rcu_read_lock();
restart:
+ dentry = d;
end = buf + buflen;
len = buflen;
prepend(&end, &len, "\0", 1);
- if (buflen < 1)
- goto Elong;
/* Get '/' right */
retval = end-1;
*retval = '/';
read_seqbegin_or_lock(&rename_lock, &seq);
while (!IS_ROOT(dentry)) {
struct dentry *parent = dentry->d_parent;
- int error;
prefetch(parent);
error = prepend_name(&end, &len, &dentry->d_name);