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-rw-r--r--fs/ubifs/dir.c30
1 files changed, 27 insertions, 3 deletions
diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index 8e587afd7732..605af512aec2 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -365,6 +365,24 @@ static int ubifs_readdir(struct file *file, void *dirent, filldir_t filldir)
*/
return 0;
+ if (file->f_version == 0) {
+ /*
+ * The file was seek'ed, which means that @file->private_data
+ * is now invalid. This may also be just the first
+ * 'ubifs_readdir()' invocation, in which case
+ * @file->private_data is NULL, and the below code is
+ * basically a no-op.
+ */
+ kfree(file->private_data);
+ file->private_data = NULL;
+ }
+
+ /*
+ * 'generic_file_llseek()' unconditionally sets @file->f_version to
+ * zero, and we use this for detecting whether the file was seek'ed.
+ */
+ file->f_version = 1;
+
/* File positions 0 and 1 correspond to "." and ".." */
if (pos == 0) {
ubifs_assert(!file->private_data);
@@ -438,6 +456,14 @@ static int ubifs_readdir(struct file *file, void *dirent, filldir_t filldir)
file->f_pos = pos = key_hash_flash(c, &dent->key);
file->private_data = dent;
cond_resched();
+
+ if (file->f_version == 0)
+ /*
+ * The file was seek'ed meanwhile, lets return and start
+ * reading direntries from the new position on the next
+ * invocation.
+ */
+ return 0;
}
out:
@@ -448,15 +474,13 @@ out:
kfree(file->private_data);
file->private_data = NULL;
+ /* 2 is a special value indicating that there are no more direntries */
file->f_pos = 2;
return 0;
}
-/* If a directory is seeked, we have to free saved readdir() state */
static loff_t ubifs_dir_llseek(struct file *file, loff_t offset, int whence)
{
- kfree(file->private_data);
- file->private_data = NULL;
return generic_file_llseek(file, offset, whence);
}