Next3 uses a few reserved fields in the Ext2 super block, group
descriptor and inode structs.
Next3 defines the following compatible features:
'big_journal' (>2GB journal), 'exclude_inode' (special exclude inode).
Next3 defines the following read-only compatible features:
'has_snapshot' (contains snaphsots), 'is_snapshot' (a snapshot image),
'fix_snapshot' and 'fix_exclude' (corrupted snapshot/exclude bitmap).
Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxxxxx>
---
debugfs/set_fields.c | 8 +++++++-
lib/e2p/feature.c | 12 ++++++++++++
lib/e2p/ls.c | 11 +++++++++++
lib/ext2fs/ext2_fs.h | 26 ++++++++++++++++++++++----
lib/ext2fs/ext2fs.h | 6 ++++++
lib/ext2fs/swapfs.c | 6 ++++++
6 files changed, 64 insertions(+), 5 deletions(-)
diff --git a/debugfs/set_fields.c b/debugfs/set_fields.c
index 88cf411..036f22c 100644
--- a/debugfs/set_fields.c
+++ b/debugfs/set_fields.c
@@ -113,6 +113,11 @@ static struct field_set_info super_fields[] = {
{ "journal_inum", &set_sb.s_journal_inum, 4, parse_uint },
{ "journal_dev", &set_sb.s_journal_dev, 4, parse_uint },
{ "last_orphan", &set_sb.s_last_orphan, 4, parse_uint },
+ { "snapshot_inum", &set_sb.s_snapshot_inum, 4, parse_uint },
+ { "snapshot_id", &set_sb.s_snapshot_id, 4, parse_uint },
+ { "snapshot_r_blocks_count", &set_sb.s_snapshot_r_blocks_count,
+ 4, parse_uint },
+ { "snapshot_list", &set_sb.s_snapshot_list, 4, parse_uint },
{ "hash_seed", &set_sb.s_hash_seed, 16, parse_uuid },
{ "def_hash_version", &set_sb.s_def_hash_version, 1, parse_hashalg },
{ "jnl_backup_type", &set_sb.s_jnl_backup_type, 1, parse_uint },
@@ -183,7 +188,8 @@ static struct field_set_info ext2_bg_fields[] = {
{ "free_inodes_count", &set_gd.bg_free_inodes_count, 2, parse_uint },
{ "used_dirs_count", &set_gd.bg_used_dirs_count, 2, parse_uint },
{ "flags", &set_gd.bg_flags, 2, parse_uint },
- { "reserved", &set_gd.bg_reserved, 2, parse_uint, FLAG_ARRAY, 2 },
+ { "exclude_bitmap", &set_gd.bg_exclude_bitmap, 4, parse_uint },
+ { "cow_bitmap", &set_gd.bg_cow_bitmap, 4, parse_uint },
{ "itable_unused", &set_gd.bg_itable_unused, 2, parse_uint },
{ "checksum", &set_gd.bg_checksum, 2, parse_gd_csum },
{ 0, 0, 0, 0 }
diff --git a/lib/e2p/feature.c b/lib/e2p/feature.c
index 1da3c7d..15c0546 100644
--- a/lib/e2p/feature.c
+++ b/lib/e2p/feature.c
@@ -29,6 +29,8 @@ static struct feature feature_list[] = {
"dir_prealloc" },
{ E2P_FEATURE_COMPAT, EXT3_FEATURE_COMPAT_HAS_JOURNAL,
"has_journal" },
+ { E2P_FEATURE_COMPAT, NEXT3_FEATURE_COMPAT_BIG_JOURNAL,
+ "big_journal" },
{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_IMAGIC_INODES,
"imagic_inodes" },
{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_EXT_ATTR,
@@ -37,6 +39,8 @@ static struct feature feature_list[] = {
"dir_index" },
{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_RESIZE_INODE,
"resize_inode" },
+ { E2P_FEATURE_COMPAT, NEXT3_FEATURE_COMPAT_EXCLUDE_INODE,
+ "exclude_inode" },
{ E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_LAZY_BG,
"lazy_bg" },
@@ -44,6 +48,14 @@ static struct feature feature_list[] = {
"sparse_super" },
{ E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_LARGE_FILE,
"large_file" },
+ { E2P_FEATURE_RO_INCOMPAT, NEXT3_FEATURE_RO_COMPAT_HAS_SNAPSHOT,
+ "has_snapshot" },
+ { E2P_FEATURE_RO_INCOMPAT, NEXT3_FEATURE_RO_COMPAT_IS_SNAPSHOT,
+ "is_snapshot" },
+ { E2P_FEATURE_RO_INCOMPAT, NEXT3_FEATURE_RO_COMPAT_FIX_SNAPSHOT,
+ "fix_snapshot" },
+ { E2P_FEATURE_RO_INCOMPAT, NEXT3_FEATURE_RO_COMPAT_FIX_EXCLUDE,
+ "fix_exclude" },
{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_HUGE_FILE,
"huge_file" },
{ E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_GDT_CSUM,
diff --git a/lib/e2p/ls.c b/lib/e2p/ls.c
index f385fd7..eea8dc5 100644
--- a/lib/e2p/ls.c
+++ b/lib/e2p/ls.c
@@ -331,6 +331,17 @@ void list_super2(struct ext2_super_block * sb, FILE *f)
if (sb->s_last_orphan)
fprintf(f, "First orphan inode: %u\n",
sb->s_last_orphan);
+ if (sb->s_snapshot_inum) {
+ fprintf(f, "Snapshot inode: %u\n",
+ sb->s_snapshot_inum);
+ fprintf(f, "Snapshot ID: %u\n",
+ sb->s_snapshot_id);
+ fprintf(f, "Snapshot reserved blocks: %u\n",
+ sb->s_snapshot_r_blocks_count);
+ }
+ if (sb->s_snapshot_list)
+ fprintf(f, "Snapshot list first inode: %u\n",
+ sb->s_snapshot_list);
if ((sb->s_feature_compat & EXT2_FEATURE_COMPAT_DIR_INDEX) ||
sb->s_def_hash_version)
fprintf(f, "Default directory hash: %s\n",
diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
index 6e31c0d..35b9ac3 100644
--- a/lib/ext2fs/ext2_fs.h
+++ b/lib/ext2fs/ext2_fs.h
@@ -144,7 +144,8 @@ struct ext2_group_desc
__u16 bg_free_inodes_count; /* Free inodes count */
__u16 bg_used_dirs_count; /* Directories count */
__u16 bg_flags;
- __u32 bg_reserved[2];
+ __u32 bg_exclude_bitmap; /* Exclude bitmap block */
+ __u32 bg_cow_bitmap; /* COW bitmap block of last snapshot */
__u16 bg_itable_unused; /* Unused inodes count */
__u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/
};
@@ -426,14 +427,14 @@ struct ext2_inode_large {
#define i_dir_acl i_size_high
#if defined(__KERNEL__) || defined(__linux__)
-#define i_reserved1 osd1.linux1.l_i_reserved1
+#define i_next_snapshot osd1.linux1.l_i_version
#define i_frag osd2.linux2.l_i_frag
#define i_fsize osd2.linux2.l_i_fsize
#define i_uid_low i_uid
#define i_gid_low i_gid
#define i_uid_high osd2.linux2.l_i_uid_high
#define i_gid_high osd2.linux2.l_i_gid_high
-#define i_reserved2 osd2.linux2.l_i_reserved2
+#define i_snapshot_blocks osd2.linux2.l_i_reserved2
#else
#if defined(__GNU__)
@@ -584,7 +585,14 @@ struct ext2_super_block {
__u8 s_reserved_char_pad;
__u16 s_reserved_pad; /* Padding to next 32bits */
__u64 s_kbytes_written; /* nr of lifetime kilobytes written */
- __u32 s_reserved[160]; /* Padding to the end of the block */
+ __u32 s_reserved[156]; /* Padding to the end of the block */
+ /*
+ * Snapshots support valid if NEXT3_FEATURE_RO_COMPAT_HAS_SNAPSHOT is set.
+ */
+ __u32 s_snapshot_list; /* Start of list of snapshot inodes */
+ __u32 s_snapshot_r_blocks_count; /* Reserved for active snapshot */
+ __u32 s_snapshot_id; /* Sequential ID of active snapshot */
+ __u32 s_snapshot_inum; /* Inode number of active snapshot */
};
/*
@@ -630,6 +638,8 @@ struct ext2_super_block {
#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010
#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
#define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040
+#define NEXT3_FEATURE_COMPAT_BIG_JOURNAL 0x1000 /* Has big journal */
+#define NEXT3_FEATURE_COMPAT_EXCLUDE_INODE 0x2000 /* Has exclude inode */
#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
@@ -638,6 +648,10 @@ struct ext2_super_block {
#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
+#define NEXT3_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x1000 /* Next3 has snapshots */
+#define NEXT3_FEATURE_RO_COMPAT_IS_SNAPSHOT 0x2000 /* Is a snapshot image */
+#define NEXT3_FEATURE_RO_COMPAT_FIX_SNAPSHOT 0x4000 /* Corrupted snapshot */
+#define NEXT3_FEATURE_RO_COMPAT_FIX_EXCLUDE 0x8000 /* Bad exclude bitmap */
#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
@@ -654,6 +668,10 @@ struct ext2_super_block {
#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE)
#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
+ NEXT3_FEATURE_RO_COMPAT_HAS_SNAPSHOT|\
+ NEXT3_FEATURE_RO_COMPAT_IS_SNAPSHOT|\
+ NEXT3_FEATURE_RO_COMPAT_FIX_SNAPSHOT|\
+ NEXT3_FEATURE_RO_COMPAT_FIX_EXCLUDE|\
EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \
EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index 213a819..c2d9fb9 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -507,6 +507,8 @@ typedef struct ext2_icount *ext2_icount_t;
#define EXT2_LIB_FEATURE_COMPAT_SUPP (EXT2_FEATURE_COMPAT_DIR_PREALLOC|\
EXT2_FEATURE_COMPAT_IMAGIC_INODES|\
EXT3_FEATURE_COMPAT_HAS_JOURNAL|\
+ NEXT3_FEATURE_COMPAT_BIG_JOURNAL|\
+ NEXT3_FEATURE_COMPAT_EXCLUDE_INODE|\
EXT2_FEATURE_COMPAT_RESIZE_INODE|\
EXT2_FEATURE_COMPAT_DIR_INDEX|\
EXT2_FEATURE_COMPAT_EXT_ATTR)
@@ -537,6 +539,10 @@ typedef struct ext2_icount *ext2_icount_t;
#define EXT2_LIB_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER|\
EXT4_FEATURE_RO_COMPAT_HUGE_FILE|\
EXT2_FEATURE_RO_COMPAT_LARGE_FILE|\
+ NEXT3_FEATURE_RO_COMPAT_HAS_SNAPSHOT|\
+ NEXT3_FEATURE_RO_COMPAT_IS_SNAPSHOT|\
+ NEXT3_FEATURE_RO_COMPAT_FIX_SNAPSHOT|\
+ NEXT3_FEATURE_RO_COMPAT_FIX_EXCLUDE|\
EXT4_FEATURE_RO_COMPAT_DIR_NLINK|\
EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE|\
EXT4_FEATURE_RO_COMPAT_GDT_CSUM)
diff --git a/lib/ext2fs/swapfs.c b/lib/ext2fs/swapfs.c
index acdb7e9..f9e224f 100644
--- a/lib/ext2fs/swapfs.c
+++ b/lib/ext2fs/swapfs.c
@@ -60,6 +60,10 @@ void ext2fs_swap_super(struct ext2_super_block * sb)
sb->s_journal_inum = ext2fs_swab32(sb->s_journal_inum);
sb->s_journal_dev = ext2fs_swab32(sb->s_journal_dev);
sb->s_last_orphan = ext2fs_swab32(sb->s_last_orphan);
+ sb->s_snapshot_inum = ext2fs_swab32(sb->s_snapshot_inum);
+ sb->s_snapshot_id = ext2fs_swab32(sb->s_snapshot_id);
+ sb->s_snapshot_r_blocks_count = ext2fs_swab32(sb->s_snapshot_r_blocks_count);
+ sb->s_snapshot_list = ext2fs_swab32(sb->s_snapshot_list);
sb->s_desc_size = ext2fs_swab16(sb->s_desc_size);
sb->s_default_mount_opts = ext2fs_swab32(sb->s_default_mount_opts);
sb->s_first_meta_bg = ext2fs_swab32(sb->s_first_meta_bg);
@@ -98,6 +102,8 @@ void ext2fs_swap_group_desc2(ext2_filsys fs, struct ext2_group_desc *gdp)
gdp->bg_free_inodes_count = ext2fs_swab16(gdp->bg_free_inodes_count);
gdp->bg_used_dirs_count = ext2fs_swab16(gdp->bg_used_dirs_count);
gdp->bg_flags = ext2fs_swab16(gdp->bg_flags);
+ gdp->bg_exclude_bitmap = ext2fs_swab32(gdp->bg_exclude_bitmap);
+ gdp->bg_cow_bitmap = ext2fs_swab32(gdp->bg_cow_bitmap);
gdp->bg_itable_unused = ext2fs_swab16(gdp->bg_itable_unused);
gdp->bg_checksum = ext2fs_swab16(gdp->bg_checksum);
/* If we're 32-bit, we're done */
--
1.6.6
--
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