From 4f468171adff3be4ad4c939b36d454afa3c7f5e9 Mon Sep 17 00:00:00 2001
From: Thomas Schmitt <scdbackup@gmx.net>
Date: Sat, 7 Mar 2009 08:28:35 +0100
Subject: [PATCH] Experiments about inode number generation for nodes out of
 the loaded image.

---
 libisofs/filesrc.c  | 28 ++++++++++++++++++++
 libisofs/fs_image.c | 64 ++++++++++++++++++++++++++++++++++++++++-----
 libisofs/libisofs.h | 19 ++++++++++++++
 3 files changed, 104 insertions(+), 7 deletions(-)

diff --git a/libisofs/filesrc.c b/libisofs/filesrc.c
index d7e79b7..55272a3 100644
--- a/libisofs/filesrc.c
+++ b/libisofs/filesrc.c
@@ -24,6 +24,12 @@ int iso_file_src_cmp(const void *n1, const void *n2)
     dev_t dev_id1, dev_id2;
     ino_t ino_id1, ino_id2;
 
+#ifdef Libisofs_file_src_cmp_sizE
+
+    off_t size1, size2;
+
+#endif /* Libisofs_file_src_cmp_sizE */
+
     f1 = (const IsoFileSrc *)n1;
     f2 = (const IsoFileSrc *)n2;
 
@@ -40,9 +46,31 @@ int iso_file_src_cmp(const void *n1, const void *n2)
             return -1;
         } else if (dev_id1 < dev_id2) {
             return 1;
+
+#ifdef Libisofs_file_src_cmp_sizE
+
+        } else if (ino_id1 > ino_id2) {
+            return -1;
+        } else if (ino_id1 < ino_id2) {
+            return 1;
+        } else {
+            size1 = iso_stream_get_size(f1->stream);
+            size2 = iso_stream_get_size(f2->stream);
+            if (size1 < size2) {
+                return -1;
+            } else if (size1 > size2) {
+                return 1;
+            }
+            return 0;
+
+#else /* Libisofs_file_src_cmp_sizE */
+
         } else {
             /* files belong to same device in same fs */
             return (ino_id1 < ino_id2) ? -1 : (ino_id1 > ino_id2) ? 1 : 0;
+
+#endif /* ! Libisofs_file_src_cmp_sizE */
+
         }
     }
 }
diff --git a/libisofs/fs_image.c b/libisofs/fs_image.c
index ad5293f..cb392eb 100644
--- a/libisofs/fs_image.c
+++ b/libisofs/fs_image.c
@@ -241,6 +241,10 @@ typedef struct
     uint32_t imgblock; /**< Block for El-Torito boot image */
     uint32_t catblock; /**< Block for El-Torito catalog */
 
+    /* ts A90303 */
+    /* Inode number generator counter */
+    ino_t inode_counter;
+
 } _ImageFsData;
 
 typedef struct image_fs_data ImageFileSourceData;
@@ -1013,6 +1017,31 @@ char *get_name(_ImageFsData *fsdata, const char *str, size_t len)
     return name;
 }
 
+
+/* ts A90303 */
+/**
+ * A global counter for default inode numbers for the ISO image filesystem.
+ * @param fs    The filesystem where the number shall be used
+ * @param flag  bit0= reset count
+ */
+static
+ino_t fs_give_ino_number(IsoImageFilesystem *fs, int flag)
+{
+    _ImageFsData *fsdata;
+
+    fsdata = (_ImageFsData*)fs->data;
+    if (flag & 1)
+        fsdata->inode_counter = 0;
+    fsdata->inode_counter++;
+    if (fsdata->inode_counter == 0) {
+
+        /* >>> raise alert because of inode rollover */;
+     
+    }
+    return fsdata->inode_counter;
+}
+
+
 /**
  *
  * @param src
@@ -1460,6 +1489,18 @@ int iso_file_source_new_ifs(IsoImageFilesystem *fs, IsoFileSource *parent,
         return ISO_SUCCESS;
     }
 
+
+#ifdef Libisofs_new_fs_image_inO
+
+    if (fsdata->rr != RR_EXT_112) {
+        if (fsdata->rr == 0) {
+            atts.st_nlink = 1;
+        }
+    }
+    atts.st_ino = fs_give_ino_number(fs, 0);
+
+#else /* Libisofs_new_fs_image_inO */
+
     /* ts Nov 25 2008: TODO
        This seems not fully consistent with read_rr_PX() which decides
        by (px->len_sue[0] == 44) whether an inode number is present or not.
@@ -1480,16 +1521,13 @@ int iso_file_source_new_ifs(IsoImageFilesystem *fs, IsoFileSource *parent,
          * It BREAKS POSIX SEMANTICS, but its suitable for our needs
          */
 
+#ifndef Libisofs_ino_from_lbA
 #define Libisofs_patch_ticket_144 yes
+#endif
 #ifdef Libisofs_patch_ticket_144
-        /* Trying to ensure unique inode numbers */
-        {
-            static ino_t iso_global_inode= 0;
 
-            if(iso_global_inode <= 0)
-                iso_global_inode= 1;
-            atts.st_ino = iso_global_inode++;
-        }
+        atts.st_ino = fs_give_ino_number(fs, 0);
+
 #else
         /* Ticket 144: This produces duplicate numbers with empty files.
         */
@@ -1500,6 +1538,8 @@ int iso_file_source_new_ifs(IsoImageFilesystem *fs, IsoFileSource *parent,
         }
     }
 
+#endif /* ! Libisofs_new_fs_image_inO */
+
     /*
      * if we haven't RR extensions, or a needed TF time stamp is not present,
      * we use plain iso recording time
@@ -2586,7 +2626,17 @@ int create_boot_img_filesrc(IsoImageFilesystem *fs, IsoFileSource **src)
 
     memset(&atts, 0, sizeof(struct stat));
     atts.st_mode = S_IFREG;
+
+#ifdef Libisofs_new_fs_image_inO
+
+    atts.st_ino = fs_give_ino_number(fs, 0);
+
+#else /* Libisofs_new_fs_image_inO */
+
     atts.st_ino = fsdata->imgblock; /* not the best solution, but... */
+
+#endif /* ! Libisofs_new_fs_image_inO */
+
     atts.st_nlink = 1;
 
     /*
diff --git a/libisofs/libisofs.h b/libisofs/libisofs.h
index 2cc9903..ea0a2e7 100644
--- a/libisofs/libisofs.h
+++ b/libisofs/libisofs.h
@@ -4771,4 +4771,23 @@ struct burn_source {
 
 #endif /* LIBISOFS_WITHOUT_LIBBURN */
 
+
+/* Attempt to fix several issues about inode numbers from ISO images */
+
+/* Experiment: Ignore PX inode numbers,
+               have boot image inode number counted by fs_give_ino_number()
+*/
+#define Libisofs_new_fs_image_inO yes
+
+/* Experiment: Trying to avoid the risk of losing file content by duplicate
+               inodes. iso_file_src_cmp() shall compare sizes too.
+*/
+#define Libisofs_file_src_cmp_sizE yes
+
+/* Experiment: Revoke Ticket 144, use data file LBAs again.
+               (will work only if not Libisofs_new_fs_image_inO
+                and wll only be safe with Libisofs_file_src_cmp_sizE)
+ #define Libisofs_ino_from_lbA yes
+*/
+
 #endif /*LIBISO_LIBISOFS_H_*/