5 files changed, 258 insertions, 14 deletions

diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index c150b6df6261..6e151f170c08 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -1301,6 +1301,15 @@ static void udf_fill_inode(struct inode *inode, struct buffer_head *bh)
                 inode->i_op = &page_symlink_inode_operations;
                 inode->i_mode = S_IFLNK | S_IRWXUGO;
                 break;
+        case ICBTAG_FILE_TYPE_MAIN:
+                udf_debug("METADATA FILE-----\n");
+                break;
+        case ICBTAG_FILE_TYPE_MIRROR:
+                udf_debug("METADATA MIRROR FILE-----\n");
+                break;
+        case ICBTAG_FILE_TYPE_BITMAP:
+                udf_debug("METADATA BITMAP FILE-----\n");
+                break;
         default:
                 printk(KERN_ERR "udf: udf_fill_inode(ino %ld) failed unknown "
                                 "file type=%d\n", inode->i_ino,
diff --git a/fs/udf/partition.c b/fs/udf/partition.c
index b2e6e1eddb90..2dfe4be2eeb2 100644
--- a/fs/udf/partition.c
+++ b/fs/udf/partition.c
@@ -266,3 +266,58 @@ int udf_relocate_blocks(struct super_block *sb, long old_block, long *new_block)
 
         return 0;
 }
+
+static uint32_t udf_try_read_meta(struct inode *inode, uint32_t block,
+                                        uint16_t partition, uint32_t offset)
+{
+        struct super_block *sb = inode->i_sb;
+        struct udf_part_map *map;
+        kernel_lb_addr eloc;
+        uint32_t elen;
+        sector_t ext_offset;
+        struct extent_position epos = {};
+        uint32_t phyblock;
+
+        if (inode_bmap(inode, block, &epos, &eloc, &elen, &ext_offset) !=
+                                                (EXT_RECORDED_ALLOCATED >> 30))
+                phyblock = 0xFFFFFFFF;
+        else {
+                map = &UDF_SB(sb)->s_partmaps[partition];
+                /* map to sparable/physical partition desc */
+                phyblock = udf_get_pblock(sb, eloc.logicalBlockNum,
+                        map->s_partition_num, ext_offset + offset);
+        }
+
+        brelse(epos.bh);
+        return phyblock;
+}
+
+uint32_t udf_get_pblock_meta25(struct super_block *sb, uint32_t block,
+                                uint16_t partition, uint32_t offset)
+{
+        struct udf_sb_info *sbi = UDF_SB(sb);
+        struct udf_part_map *map;
+        struct udf_meta_data *mdata;
+        uint32_t retblk;
+        struct inode *inode;
+
+        udf_debug("READING from METADATA\n");
+
+        map = &sbi->s_partmaps[partition];
+        mdata = &map->s_type_specific.s_metadata;
+        inode = mdata->s_metadata_fe ? : mdata->s_mirror_fe;
+
+        /* We shouldn't mount such media... */
+        BUG_ON(!inode);
+        retblk = udf_try_read_meta(inode, block, partition, offset);
+        if (retblk == 0xFFFFFFFF) {
+                udf_warning(sb, __func__, "error reading from METADATA, "
+                        "trying to read from MIRROR");
+                inode = mdata->s_mirror_fe;
+                if (!inode)
+                        return 0xFFFFFFFF;
+                retblk = udf_try_read_meta(inode, block, partition, offset);
+        }
+
+        return retblk;
+}
diff --git a/fs/udf/super.c b/fs/udf/super.c
index 787cedf6cc07..29b19678327a 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -950,6 +950,101 @@ static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
         return 0;
 }
 
+static int udf_load_metadata_files(struct super_block *sb, int partition)
+{
+        struct udf_sb_info *sbi = UDF_SB(sb);
+        struct udf_part_map *map;
+        struct udf_meta_data *mdata;
+        kernel_lb_addr addr;
+        int fe_error = 0;
+
+        map = &sbi->s_partmaps[partition];
+        mdata = &map->s_type_specific.s_metadata;
+
+        /* metadata address */
+        addr.logicalBlockNum =  mdata->s_meta_file_loc;
+        addr.partitionReferenceNum = map->s_partition_num;
+
+        udf_debug("Metadata file location: block = %d part = %d\n",
+                          addr.logicalBlockNum, addr.partitionReferenceNum);
+
+        mdata->s_metadata_fe = udf_iget(sb, addr);
+
+        if (mdata->s_metadata_fe == NULL) {
+                udf_warning(sb, __func__, "metadata inode efe not found, "
+                                "will try mirror inode.");
+                fe_error = 1;
+        } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type !=
+                 ICBTAG_FLAG_AD_SHORT) {
+                udf_warning(sb, __func__, "metadata inode efe does not have "
+                        "short allocation descriptors!");
+                fe_error = 1;
+                iput(mdata->s_metadata_fe);
+                mdata->s_metadata_fe = NULL;
+        }
+
+        /* mirror file entry */
+        addr.logicalBlockNum = mdata->s_mirror_file_loc;
+        addr.partitionReferenceNum = map->s_partition_num;
+
+        udf_debug("Mirror metadata file location: block = %d part = %d\n",
+                          addr.logicalBlockNum, addr.partitionReferenceNum);
+
+        mdata->s_mirror_fe = udf_iget(sb, addr);
+
+        if (mdata->s_mirror_fe == NULL) {
+                if (fe_error) {
+                        udf_error(sb, __func__, "mirror inode efe not found "
+                        "and metadata inode is missing too, exiting...");
+                        goto error_exit;
+                } else
+                        udf_warning(sb, __func__, "mirror inode efe not found,"
+                                        " but metadata inode is OK");
+        } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type !=
+                 ICBTAG_FLAG_AD_SHORT) {
+                udf_warning(sb, __func__, "mirror inode efe does not have "
+                        "short allocation descriptors!");
+                iput(mdata->s_mirror_fe);
+                mdata->s_mirror_fe = NULL;
+                if (fe_error)
+                        goto error_exit;
+        }
+
+        /*
+         * bitmap file entry
+         * Note:
+         * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
+        */
+        if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
+                addr.logicalBlockNum = mdata->s_bitmap_file_loc;
+                addr.partitionReferenceNum = map->s_partition_num;
+
+                udf_debug("Bitmap file location: block = %d part = %d\n",
+                        addr.logicalBlockNum, addr.partitionReferenceNum);
+
+                mdata->s_bitmap_fe = udf_iget(sb, addr);
+
+                if (mdata->s_bitmap_fe == NULL) {
+                        if (sb->s_flags & MS_RDONLY)
+                                udf_warning(sb, __func__, "bitmap inode efe "
+                                        "not found but it's ok since the disc"
+                                        " is mounted read-only");
+                        else {
+                                udf_error(sb, __func__, "bitmap inode efe not "
+                                        "found and attempted read-write mount");
+                                goto error_exit;
+                        }
+                }
+        }
+
+        udf_debug("udf_load_metadata_files Ok\n");
+
+        return 0;
+
+error_exit:
+        return 1;
+}
+
 static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
                              kernel_lb_addr *root)
 {
@@ -1169,7 +1264,7 @@ static int udf_load_partdesc(struct super_block *sb, sector_t block)
         p = (struct partitionDesc *)bh->b_data;
         partitionNumber = le16_to_cpu(p->partitionNumber);
 
-        /* First scan for TYPE1 and SPARABLE partitions */
+        /* First scan for TYPE1, SPARABLE and METADATA partitions */
         for (i = 0; i < sbi->s_partitions; i++) {
                 map = &sbi->s_partmaps[i];
                 udf_debug("Searching map: (%d == %d)\n",
@@ -1189,8 +1284,8 @@ static int udf_load_partdesc(struct super_block *sb, sector_t block)
         ret = udf_fill_partdesc_info(sb, p, i);
 
         /*
-         * Now rescan for VIRTUAL partitions when TYPE1 partitions are
-         * already set up
+         * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
+         * PHYSICAL partitions are already set up
          */
         type1_idx = i;
         for (i = 0; i < sbi->s_partitions; i++) {
@@ -1198,7 +1293,8 @@ static int udf_load_partdesc(struct super_block *sb, sector_t block)
 
                 if (map->s_partition_num == partitionNumber &&
                     (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
-                     map->s_partition_type == UDF_VIRTUAL_MAP20))
+                     map->s_partition_type == UDF_VIRTUAL_MAP20 ||
+                     map->s_partition_type == UDF_METADATA_MAP25))
                         break;
         }
 
@@ -1208,16 +1304,28 @@ static int udf_load_partdesc(struct super_block *sb, sector_t block)
         ret = udf_fill_partdesc_info(sb, p, i);
         if (ret)
                 goto out_bh;
-        /*
-         * Mark filesystem read-only if we have a partition with virtual map
-         * since we don't handle writing to it (we overwrite blocks instead of
-         * relocating them).
-         */
-        sb->s_flags |= MS_RDONLY;
-        printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only because "
-                "writing to pseudooverwrite partition is not implemented.\n");
 
-        ret = udf_load_vat(sb, i, type1_idx);
+        if (map->s_partition_type == UDF_METADATA_MAP25) {
+                ret = udf_load_metadata_files(sb, i);
+                if (ret) {
+                        printk(KERN_ERR "UDF-fs: error loading MetaData "
+                        "partition map %d\n", i);
+                        goto out_bh;
+                }
+        } else {
+                ret = udf_load_vat(sb, i, type1_idx);
+                if (ret)
+                        goto out_bh;
+                /*
+                 * Mark filesystem read-only if we have a partition with
+                 * virtual map since we don't handle writing to it (we
+                 * overwrite blocks instead of relocating them).
+                 */
+                sb->s_flags |= MS_RDONLY;
+                printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only "
+                        "because writing to pseudooverwrite partition is "
+                        "not implemented.\n");
+        }
 out_bh:
         /* In case loading failed, we handle cleanup in udf_fill_super */
         brelse(bh);
@@ -1316,6 +1424,50 @@ static int udf_load_logicalvol(struct super_block *sb, sector_t block,
                                         }
                                 }
                                 map->s_partition_func = udf_get_pblock_spar15;
+                        } else if (!strncmp(upm2->partIdent.ident,
+                                                UDF_ID_METADATA,
+                                                strlen(UDF_ID_METADATA))) {
+                                struct udf_meta_data *mdata =
+                                        &map->s_type_specific.s_metadata;
+                                struct metadataPartitionMap *mdm =
+                                                (struct metadataPartitionMap *)
+                                                &(lvd->partitionMaps[offset]);
+                                udf_debug("Parsing Logical vol part %d "
+                                        "type %d  id=%s\n", i, type,
+                                        UDF_ID_METADATA);
+
+                                map->s_partition_type = UDF_METADATA_MAP25;
+                                map->s_partition_func = udf_get_pblock_meta25;
+
+                                mdata->s_meta_file_loc   =
+                                        le32_to_cpu(mdm->metadataFileLoc);
+                                mdata->s_mirror_file_loc =
+                                        le32_to_cpu(mdm->metadataMirrorFileLoc);
+                                mdata->s_bitmap_file_loc =
+                                        le32_to_cpu(mdm->metadataBitmapFileLoc);
+                                mdata->s_alloc_unit_size =
+                                        le32_to_cpu(mdm->allocUnitSize);
+                                mdata->s_align_unit_size =
+                                        le16_to_cpu(mdm->alignUnitSize);
+                                mdata->s_dup_md_flag     =
+                                        mdm->flags & 0x01;
+
+                                udf_debug("Metadata Ident suffix=0x%x\n",
+                                        (le16_to_cpu(
+                                         ((__le16 *)
+                                              mdm->partIdent.identSuffix)[0])));
+                                udf_debug("Metadata part num=%d\n",
+                                        le16_to_cpu(mdm->partitionNum));
+                                udf_debug("Metadata part alloc unit size=%d\n",
+                                        le32_to_cpu(mdm->allocUnitSize));
+                                udf_debug("Metadata file loc=%d\n",
+                                        le32_to_cpu(mdm->metadataFileLoc));
+                                udf_debug("Mirror file loc=%d\n",
+                                       le32_to_cpu(mdm->metadataMirrorFileLoc));
+                                udf_debug("Bitmap file loc=%d\n",
+                                       le32_to_cpu(mdm->metadataBitmapFileLoc));
+                                udf_debug("Duplicate Flag: %d %d\n",
+                                        mdata->s_dup_md_flag, mdm->flags);
                         } else {
                                 udf_debug("Unknown ident: %s\n",
                                           upm2->partIdent.ident);
@@ -1677,6 +1829,7 @@ static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
 static void udf_free_partition(struct udf_part_map *map)
 {
         int i;
+        struct udf_meta_data *mdata;
 
         if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
                 iput(map->s_uspace.s_table);
@@ -1689,6 +1842,17 @@ static void udf_free_partition(struct udf_part_map *map)
         if (map->s_partition_type == UDF_SPARABLE_MAP15)
                 for (i = 0; i < 4; i++)
                         brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
+        else if (map->s_partition_type == UDF_METADATA_MAP25) {
+                mdata = &map->s_type_specific.s_metadata;
+                iput(mdata->s_metadata_fe);
+                mdata->s_metadata_fe = NULL;
+
+                iput(mdata->s_mirror_fe);
+                mdata->s_mirror_fe = NULL;
+
+                iput(mdata->s_bitmap_fe);
+                mdata->s_bitmap_fe = NULL;
+        }
 }
 
 static int udf_fill_super(struct super_block *sb, void *options, int silent)
diff --git a/fs/udf/udf_sb.h b/fs/udf/udf_sb.h
index 8308a12e1232..1c1c514a9725 100644
--- a/fs/udf/udf_sb.h
+++ b/fs/udf/udf_sb.h
@@ -6,7 +6,7 @@
 /* Since UDF 2.01 is ISO 13346 based... */
 #define UDF_SUPER_MAGIC                 0x15013346
 
-#define UDF_MAX_READ_VERSION            0x0201
+#define UDF_MAX_READ_VERSION            0x0250
 #define UDF_MAX_WRITE_VERSION           0x0201
 
 #define UDF_FLAG_USE_EXTENDED_FE        0
@@ -46,9 +46,22 @@
 #define UDF_VIRTUAL_MAP15               0x1512U
 #define UDF_VIRTUAL_MAP20               0x2012U
 #define UDF_SPARABLE_MAP15              0x1522U
+#define UDF_METADATA_MAP25              0x2511U
 
 #pragma pack(1) /* XXX(hch): Why?  This file just defines in-core structures */
 
+struct udf_meta_data {
+        __u32   s_meta_file_loc;
+        __u32   s_mirror_file_loc;
+        __u32   s_bitmap_file_loc;
+        __u32   s_alloc_unit_size;
+        __u16   s_align_unit_size;
+        __u8    s_dup_md_flag;
+        struct inode *s_metadata_fe;
+        struct inode *s_mirror_fe;
+        struct inode *s_bitmap_fe;
+};
+
 struct udf_sparing_data {
         __u16   s_packet_len;
         struct buffer_head *s_spar_map[4];
@@ -82,6 +95,7 @@ struct udf_part_map {
         union {
                 struct udf_sparing_data s_sparing;
                 struct udf_virtual_data s_virtual;
+                struct udf_meta_data s_metadata;
         } s_type_specific;
         __u32   (*s_partition_func)(struct super_block *, __u32, __u16, __u32);
         __u16   s_volumeseqnum;
diff --git a/fs/udf/udfdecl.h b/fs/udf/udfdecl.h
index 2cb2f5de4245..30f664ab0cd9 100644
--- a/fs/udf/udfdecl.h
+++ b/fs/udf/udfdecl.h
@@ -177,6 +177,8 @@ extern uint32_t udf_get_pblock_virt20(struct super_block *, uint32_t, uint16_t,
                                       uint32_t);
 extern uint32_t udf_get_pblock_spar15(struct super_block *, uint32_t, uint16_t,
                                       uint32_t);
+extern uint32_t udf_get_pblock_meta25(struct super_block *, uint32_t, uint16_t,
+                                          uint32_t);
 extern int udf_relocate_blocks(struct super_block *, long, long *);
 
 /* unicode.c */