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Date: Wed, 2 Jun 2010 10:43:15 -0400
From: Theodore Ts'o <tytso@....edu>
To: Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc: amir73il@...rs.sourceforge.net, Theodore Ts'o <tytso@....edu>
Subject: [PATCH] Reserve feature flags and fields needed for the Next3 snapshot feature
The documentation is not (as of this writing) fully complete, but
there is some documentation here:
http://sourceforge.net/apps/mediawiki/next3/index.php?title=Code_documentation
http://sourceforge.net/apps/mediawiki/next3/index.php?title=On-disk_format
http://sourceforge.net/projects/next3/files/Next3_Snapshots.pdf/download
... which will hopefully be updated soon to be fully up to date with
these assignments and more details about how things work.
For now, the assignments should avoid collisions with other new work
that people might want to do on ext3/4.
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
---
lib/ext2fs/ext2_fs.h | 16 +++++++++++++++-
1 files changed, 15 insertions(+), 1 deletions(-)
diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
index cb21318..8735105 100644
--- a/lib/ext2fs/ext2_fs.h
+++ b/lib/ext2fs/ext2_fs.h
@@ -50,6 +50,7 @@
#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
#define EXT2_RESIZE_INO 7 /* Reserved group descriptors inode */
#define EXT2_JOURNAL_INO 8 /* Journal inode */
+#define EXT2_EXCLUDE_INO 9 /* The "exclude" inode, for snapshots */
/* First non-reserved inode for old ext2 filesystems */
#define EXT2_GOOD_OLD_FIRST_INO 11
@@ -275,6 +276,9 @@ struct ext2_dx_countlimit {
#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
+#define EXT4_SNAPFILE_FL 0x01000000 /* Inode is a snapshot */
+#define EXT4_SNAPFILE_DELETED_FL 0x04000000 /* Snapshot is being deleted */
+#define EXT4_SNAPFILE_SHRUNK_FL 0x08000000 /* Snapshot shrink has completed */
#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
#define EXT2_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
@@ -463,6 +467,9 @@ struct ext2_inode_large {
#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* OK for use on development code */
+#define EXT2_FLAGS_IS_SNAPSHOT 0x0010 /* This is a snapshot image */
+#define EXT2_FLAGS_FIX_SNAPSHOT 0x0020 /* Snapshot inodes corrupted */
+#define EXT2_FLAGS_FIX_EXCLUDE 0x0040 /* Exclude bitmaps corrupted */
/*
* Mount flags
@@ -582,7 +589,12 @@ 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_snapshot_inum; /* Inode number of active snapshot */
+ __u32 s_snapshot_id; /* sequential ID of active snapshot */
+ __u64 s_snapshot_r_blocks_count; /* reserved blocks for active
+ snapshot's future use */
+ __u32 s_snapshot_list; /* inode number of the head of the on-disk snapshot list */
+ __u32 s_reserved[155]; /* Padding to the end of the block */
};
/*
@@ -628,6 +640,7 @@ 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 EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080
#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
@@ -636,6 +649,7 @@ 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 EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080
#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
--
1.6.6.1.1.g974db.dirty
--
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