Ext2/3 forward compatibility: inode size
This patch allows filesystems with expanded inodes to be mounted.
(compatibility feature flags will be used to control whether or not the
filesystem should be mounted in case the new inode fields will result in
compatibility issues). This allows for future compatibility with newer
versions of ext2fs.
ext2/ext2.h | 7 +++++++
ext2/ialloc.c | 1 +
ext2/inode.c | 7 +++++++
ext2/super.c | 4 +++-
ext3/inode.c | 14 +++++---------
ext3/super.c | 4 +++-
6 files changed, 26 insertions(+), 11 deletions(-)
diff -Nru a/fs/ext2/ext2.h b/fs/ext2/ext2.h
--- a/fs/ext2/ext2.h Tue Oct 29 09:54:39 2002
+++ b/fs/ext2/ext2.h Tue Oct 29 09:54:39 2002
@@ -10,6 +10,7 @@
__u32 i_faddr;
__u8 i_frag_no;
__u8 i_frag_size;
+ __u16 i_state;
__u32 i_file_acl;
__u32 i_dir_acl;
__u32 i_dtime;
@@ -22,6 +23,12 @@
rwlock_t i_meta_lock;
struct inode vfs_inode;
};
+
+/*
+ * Inode dynamic state flags
+ */
+#define EXT2_STATE_NEW 0x00000001 /* inode is newly created */
+
/*
* Function prototypes
diff -Nru a/fs/ext2/ialloc.c b/fs/ext2/ialloc.c
--- a/fs/ext2/ialloc.c Tue Oct 29 09:54:39 2002
+++ b/fs/ext2/ialloc.c Tue Oct 29 09:54:39 2002
@@ -386,6 +386,7 @@
ei->i_prealloc_block = 0;
ei->i_prealloc_count = 0;
ei->i_dir_start_lookup = 0;
+ ei->i_state = EXT2_STATE_NEW;
if (ei->i_flags & EXT2_SYNC_FL)
inode->i_flags |= S_SYNC;
if (ei->i_flags & EXT2_DIRSYNC_FL)
diff -Nru a/fs/ext2/inode.c b/fs/ext2/inode.c
--- a/fs/ext2/inode.c Tue Oct 29 09:54:39 2002
+++ b/fs/ext2/inode.c Tue Oct 29 09:54:39 2002
@@ -1012,6 +1012,7 @@
ei->i_dir_acl = le32_to_cpu(raw_inode->i_dir_acl);
ei->i_dtime = 0;
inode->i_generation = le32_to_cpu(raw_inode->i_generation);
+ ei->i_state = 0;
ei->i_next_alloc_block = 0;
ei->i_next_alloc_goal = 0;
ei->i_prealloc_count = 0;
@@ -1076,6 +1077,11 @@
if (IS_ERR(raw_inode))
return -EIO;
+ /* For fields not not tracking in the in-memory inode,
+ * initialise them to zero for new inodes. */
+ if (ei->i_state & EXT2_STATE_NEW)
+ memset(raw_inode, 0, EXT2_SB(sb)->s_inode_size);
+
if (ino == EXT2_ACL_IDX_INO || ino == EXT2_ACL_DATA_INO) {
ext2_error (sb, "ext2_write_inode", "bad inode number: %lu",
(unsigned long) ino);
@@ -1152,6 +1158,7 @@
err = -EIO;
}
}
+ ei->i_state &= ~EXT2_STATE_NEW;
brelse (bh);
return err;
}
diff -Nru a/fs/ext2/super.c b/fs/ext2/super.c
--- a/fs/ext2/super.c Tue Oct 29 09:54:39 2002
+++ b/fs/ext2/super.c Tue Oct 29 09:54:39 2002
@@ -630,7 +630,9 @@
} else {
sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
- if (sbi->s_inode_size != EXT2_GOOD_OLD_INODE_SIZE) {
+ if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
+ (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
+ (sbi->s_inode_size > blocksize)) {
printk ("EXT2-fs: unsupported inode size: %d\n",
sbi->s_inode_size);
goto failed_mount;
diff -Nru a/fs/ext3/inode.c b/fs/ext3/inode.c
--- a/fs/ext3/inode.c Tue Oct 29 09:54:39 2002
+++ b/fs/ext3/inode.c Tue Oct 29 09:54:39 2002
@@ -2325,6 +2325,11 @@
if (err)
goto out_brelse;
}
+ /* For fields not not tracking in the in-memory inode,
+ * initialise them to zero for new inodes. */
+ if (ei->i_state & EXT3_STATE_NEW)
+ memset(raw_inode, 0, EXT3_SB(inode->i_sb)->s_inode_size);
+
raw_inode->i_mode = cpu_to_le16(inode->i_mode);
if(!(test_opt(inode->i_sb, NO_UID32))) {
raw_inode->i_uid_low = cpu_to_le16(low_16_bits(inode->i_uid));
@@ -2362,15 +2367,6 @@
raw_inode->i_faddr = cpu_to_le32(ei->i_faddr);
raw_inode->i_frag = ei->i_frag_no;
raw_inode->i_fsize = ei->i_frag_size;
-#else
- /* If we are not tracking these fields in the in-memory inode,
- * then preserve them on disk, but still initialise them to zero
- * for new inodes. */
- if (ei->i_state & EXT3_STATE_NEW) {
- raw_inode->i_faddr = 0;
- raw_inode->i_frag = 0;
- raw_inode->i_fsize = 0;
- }
#endif
raw_inode->i_file_acl = cpu_to_le32(ei->i_file_acl);
if (!S_ISREG(inode->i_mode)) {
diff -Nru a/fs/ext3/super.c b/fs/ext3/super.c
--- a/fs/ext3/super.c Tue Oct 29 09:54:39 2002
+++ b/fs/ext3/super.c Tue Oct 29 09:54:39 2002
@@ -1116,7 +1116,9 @@
} else {
sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
- if (sbi->s_inode_size != EXT3_GOOD_OLD_INODE_SIZE) {
+ if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
+ (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
+ (sbi->s_inode_size > blocksize)) {
printk (KERN_ERR
"EXT3-fs: unsupported inode size: %d\n",
sbi->s_inode_size);
-
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This archive was generated by hypermail 2b29 : Thu Oct 31 2002 - 22:00:42 EST