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authorOndrej Zary <linux@rainbow-software.org>2010-10-27 15:33:30 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-27 18:03:08 -0700
commite45c9effed903ba3fdbd6ef0498ee8989c35af0a (patch)
treefb754f3858b2188e95e63c435b2844fe5c476661 /fs/isofs
parentb4754ebc319ca2e8eb95e51a5d2e2d00047c4db9 (diff)
downloadlinaro-lsk-e45c9effed903ba3fdbd6ef0498ee8989c35af0a.tar.gz
isofs: work-around for Rock Ridge+Joliet CDs with empty ISO root directory
If a CD has both Rock Ridge and Joliet extensions and the ISO root directory is empty, no files are visible. Disable Rock Ridge extensions in this case and use Joliet root directory instead. Signed-off-by: Ondrej Zary <linux@rainbow-software.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Guenter Roeck <guenter.roeck@ericsson.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/isofs')
-rw-r--r--fs/isofs/inode.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index 60c2b944d76..79cf7f616bb 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -544,6 +544,34 @@ static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
}
/*
+ * Check if root directory is empty (has less than 3 files).
+ *
+ * Used to detect broken CDs where ISO root directory is empty but Joliet root
+ * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
+ * (and Joliet used instead) or else no files would be visible.
+ */
+static bool rootdir_empty(struct super_block *sb, unsigned long block)
+{
+ int offset = 0, files = 0, de_len;
+ struct iso_directory_record *de;
+ struct buffer_head *bh;
+
+ bh = sb_bread(sb, block);
+ if (!bh)
+ return true;
+ while (files < 3) {
+ de = (struct iso_directory_record *) (bh->b_data + offset);
+ de_len = *(unsigned char *) de;
+ if (de_len == 0)
+ break;
+ files++;
+ offset += de_len;
+ }
+ brelse(bh);
+ return files < 3;
+}
+
+/*
* Initialize the superblock and read the root inode.
*
* Note: a check_disk_change() has been done immediately prior
@@ -843,6 +871,18 @@ root_found:
goto out_no_root;
/*
+ * Fix for broken CDs with Rock Ridge and empty ISO root directory but
+ * correct Joliet root directory.
+ */
+ if (sbi->s_rock == 1 && joliet_level &&
+ rootdir_empty(s, sbi->s_firstdatazone)) {
+ printk(KERN_NOTICE
+ "ISOFS: primary root directory is empty. "
+ "Disabling Rock Ridge and switching to Joliet.");
+ sbi->s_rock = 0;
+ }
+
+ /*
* If this disk has both Rock Ridge and Joliet on it, then we
* want to use Rock Ridge by default. This can be overridden
* by using the norock mount option. There is still one other