diff options
Diffstat (limited to 'fs/dcache.c')
| -rw-r--r-- | fs/dcache.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/fs/dcache.c b/fs/dcache.c index 91e551b5af59..dddc67fed732 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -2869,6 +2869,16 @@ static int prepend_unreachable(char **buffer, int *buflen) return prepend(buffer, buflen, "(unreachable)", 13); } +static void get_fs_root_rcu(struct fs_struct *fs, struct path *root) +{ + unsigned seq; + + do { + seq = read_seqcount_begin(&fs->seq); + *root = fs->root; + } while (read_seqcount_retry(&fs->seq, seq)); +} + /** * d_path - return the path of a dentry * @path: path to report @@ -2901,13 +2911,15 @@ char *d_path(const struct path *path, char *buf, int buflen) if (path->dentry->d_op && path->dentry->d_op->d_dname) return path->dentry->d_op->d_dname(path->dentry, buf, buflen); - get_fs_root(current->fs, &root); + rcu_read_lock(); + get_fs_root_rcu(current->fs, &root); br_read_lock(&vfsmount_lock); error = path_with_deleted(path, &root, &res, &buflen); br_read_unlock(&vfsmount_lock); + rcu_read_unlock(); + if (error < 0) res = ERR_PTR(error); - path_put(&root); return res; } EXPORT_SYMBOL(d_path); |