Several FS mtime support.

* grub-core/fs/affs.c (grub_affs_time): New struct.
	(grub_affs_file): New field mtime.
	(grub_fshelp_node): Changed 'block' and 'parent' to more appropriate
	type. Removed 'size'. New field 'di'. All users updated.
	(grub_affs_mount): Simplify checsum checking.
	(grub_affs_iterate_dir): New helper grub_affs_create_node.
	(grub_affs_dir): Handle mtime.
	* grub-core/fs/cpio.c (grub_cpio_find_file): Handle mtime.
	(grub_cpio_dir): Likewise.
	* grub-core/fs/hfs.c (grub_hfs_dirrec): New fields 'ctime' and 'mtime'.
	(grub_hfs_filerec): New field mtime.
	(grub_hfs_dir): Handle mtime.
	(grub_hfs_mtime): New function.
	(grub_hfs_fs): Register grub_hfs_mtime.
	* grub-core/fs/iso9660.c (grub_iso9660_date2): New struct.
	(grub_iso9660_dir): New field mtime.
	(grub_fshelp_node): New field dirent.
	(iso9660_to_unixtime): New function.
	(iso9660_to_unixtime2): Likewise.
	(grub_iso9660_read_symlink): Use node->dirent.
	(grub_iso9660_iterate_dir): Likewise.
	(grub_iso9660_dir): Set mtime.
	(grub_iso9660_mtime): New function.
	(grub_iso9660_fs): Register grub_iso9660_mtime.
	* grub-core/fs/jfs.c (grub_jfs_time): New struct.
	(grub_jfs_inode): New fields atime, ctime and mtime.
	(grub_jfs_dir): Set mtime.
	* grub-core/fs/minix.c (grub_minix_dir): Likewise.
	* grub-core/fs/ntfs.c (list_file): Set mtime.
	(grub_ntfs_dir): Likewise.
	* grub-core/fs/reiserfs.c (grub_fshelp_node): New field 'mtime'.
	(grub_reiserfs_iterate_dir): Set mtime.
	(grub_reiserfs_dir): Likewise.
	* grub-core/fs/sfs.c (grub_sfs_obj): New field mtime.
	(grub_fshelp_node): Likewise.
	(grub_sfs_iterate_dir): Set mtime.
	(grub_sfs_dir): Likewise.
	* grub-core/fs/udf.c (grub_udf_dir): Set mtime.
	* grub-core/fs/xfs.c (grub_xfs_time): New struct.
	(grub_xfs_inode): New fields atime, mtime, ctime.
	(grub_xfs_dir): Set mtime.
	* include/grub/datetime.h (grub_datetime2unixtime): New function.
	* include/grub/hfs.h (grub_hfs_sblock): New fields ctime and mtime.
	* include/grub/ntfs.h (grub_fshelp_node): New field mtime.

	Support UDF symlinks.

	* grub-core/fs/udf.c (grub_udf_iterate_dir): Handle symlinks.
	(grub_ufs_read_symlink): New function. All users updated.

	Check amiga partmap checksum.

	* grub-core/partmap/amiga.c (grub_amiga_rdsk): Pad to 128 bytes.
	(grub_amiga_partition): Likewise.
	(amiga_partition_map_checksum): New function.
	(amiga_partition_map_iterate): Check checksum.

include/grub/datetime.h

@@ -51,5 +51,78 @@ char *grub_get_weekday_name (struct grub_datetime *datetime);
 void grub_unixtime2datetime (grub_int32_t nix,
 			     struct grub_datetime *datetime);
 
+static inline int
+grub_datetime2unixtime (const struct grub_datetime *datetime, grub_int32_t *nix)
+{
+  grub_int32_t ret;
+  int y4, ay;
+  const grub_uint16_t monthssum[12]
+    = { 0,
+	31, 
+	31 + 28,
+	31 + 28 + 31,
+	31 + 28 + 31 + 30,
+	31 + 28 + 31 + 30 + 31, 
+	31 + 28 + 31 + 30 + 31 + 30,
+	31 + 28 + 31 + 30 + 31 + 30 + 31,
+	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31,
+	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
+	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
+	31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30};
+  const grub_uint8_t months[12] = {31, 28, 31, 30, 31, 30,
+				   31, 31, 30, 31, 30, 31};
+  const int SECPERMIN = 60;
+  const int SECPERHOUR = 60 * SECPERMIN;
+  const int SECPERDAY = 24 * SECPERHOUR;
+  const int SECPERYEAR = 365 * SECPERDAY;
+  const int SECPER4YEARS = 4 * SECPERYEAR + SECPERDAY;
+
+  if (datetime->year > 2038 || datetime->year < 1901)
+    return 0;
+  if (datetime->month > 12 || datetime->month < 1)
+    return 0;
+
+  /* In the period of validity of unixtime all years divisible by 4
+     are bissextile*/
+  /* Convenience: let's have 3 consecutive non-bissextile years
+     at the beginning of the epoch. So count from 1971 instead of 1970 */
+  ret = SECPERYEAR + SECPERDAY;
+
+  /* Transform C divisions and modulos to mathematical ones */
+  y4 = (datetime->year - 1971) / 4;
+  if (datetime->year < 1971)
+    y4--;
+  ay = datetime->year - 1971 - 4 * y4;
+  ret += y4 * SECPER4YEARS;
+  ret += ay * SECPERYEAR;
+
+  ret += monthssum[datetime->month - 1] * SECPERDAY;
+  if (ay == 0 && datetime->month >= 3)
+    ret += SECPERDAY;
+
+  ret += (datetime->day - 1) * SECPERDAY;
+  if ((datetime->day > months[datetime->month - 1]
+       && (!ay || datetime->month != 2 || datetime->day != 29))
+      || datetime->day < 1)
+    return 0;
+
+  ret += datetime->hour * SECPERHOUR;
+  if (datetime->hour > 23)
+    return 0;
+  ret += datetime->minute * 60;
+  if (datetime->minute > 59)
+    return 0;
+
+  ret += datetime->second;
+  /* Accept leap seconds.  */
+  if (datetime->second > 60)
+    return 0;
+
+  if ((datetime->year > 1980 && ret < 0)
+      || (datetime->year < 1960 && ret > 0))
+    return 0;
+  *nix = ret;
+  return 1;
+}
 
 #endif /* ! KERNEL_DATETIME_HEADER */

include/grub/hfs.h

@@ -39,7 +39,9 @@ typedef struct grub_hfs_extent grub_hfs_datarecord_t[3];
 struct grub_hfs_sblock
 {
   grub_uint16_t magic;
-  grub_uint8_t unused[18];
+  grub_uint32_t ctime;
+  grub_uint32_t mtime;
+  grub_uint8_t unused[10];
   grub_uint32_t blksz;
   grub_uint8_t unused2[4];
   grub_uint16_t first_block;

include/grub/ntfs.h

@@ -135,6 +135,7 @@ struct grub_fshelp_node
   struct grub_ntfs_data *data;
   char *buf;
   grub_uint64_t size;
+  grub_uint64_t mtime;
   grub_uint32_t ino;
   int inode_read;
   struct grub_ntfs_attr attr;