commit b175e2441b0cd9fae60341ba92b0f7f192e71446
Author: girish <girish>

b=16893
i=adilger
i=johann

ext4 ldiskfs patches for rhel5

---
 fs/ext4/ext4.h   |   23 ++++++++++++++++++++++-
 fs/ext4/ext4_jbd2.c | 1 +
 fs/ext4/ialloc.c |    3 ++-
 fs/ext4/inode.c  |   15 +++++++++++++++
 fs/ext4/namei.c  |    9 ++++++---
 fs/ext4/super.c  |   10 ++--------
 5 files changed, 48 insertions(+), 13 deletions(-)

diff -ur a/fs/ext4/ext4.h b/fs/ext4/ext4.h
--- a/fs/ext4/ext4.h	2021-06-28 08:45:39.093954644 -0600
+++ b/fs/ext4/ext4.h	2021-06-28 08:46:06.913523572 -0600
@@ -1995,7 +1997,21 @@
 
 EXTN_FEATURE_FUNCS(2)
 EXTN_FEATURE_FUNCS(3)
-EXTN_FEATURE_FUNCS(4)
+static inline bool ext4_has_unknown_ext4_compat_features(struct super_block *sb)
+{
+	return ((EXT4_SB(sb)->s_es->s_feature_compat &
+		cpu_to_le32(~EXT4_FEATURE_COMPAT_SUPP)) != 0);
+}
+static inline bool ext4_has_unknown_ext4_ro_compat_features(struct super_block *sb)
+{
+	return ((EXT4_SB(sb)->s_es->s_feature_ro_compat &
+		cpu_to_le32(~EXT4_FEATURE_RO_COMPAT_SUPP)) != 0);
+}
+static inline bool ext4_has_unknown_ext4_incompat_features(struct super_block *sb)
+{
+	return ((EXT4_SB(sb)->s_es->s_feature_incompat &
+		cpu_to_le32(~EXT4_FEATURE_INCOMPAT_SUPP)) != 0);
+}
 
 static inline bool ext4_has_compat_features(struct super_block *sb)
 {
@@ -3399,6 +3415,13 @@
 #define EXT_MAX_BLOCKS	0xffffffff
 
 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
+extern struct buffer_head *ext4_read_inode_bitmap(struct super_block *sb,
+						  ext4_group_t block_group);
+extern void ext4_inc_count(handle_t *handle, struct inode *inode);
+extern void ext4_dec_count(handle_t *handle, struct inode *inode);
+extern struct buffer_head *ext4_append(handle_t *handle,
+				       struct inode *inode,
+				       ext4_lblk_t *block);
 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
 			       struct ext4_map_blocks *map, int flags);
diff -ur a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c
--- a/fs/ext4/ext4_jbd2.c	2021-06-28 08:45:38.905957595 -0600
+++ b/fs/ext4/ext4_jbd2.c	2021-06-28 08:49:18.306817373 -0600
@@ -169,6 +169,7 @@
 	revoke_cred = max(0, revoke_cred - handle->h_revoke_credits);
 	return ext4_journal_extend(handle, extend_cred, revoke_cred);
 }
+EXPORT_SYMBOL(__ext4_journal_ensure_credits);
 
 static void ext4_journal_abort_handle(const char *caller, unsigned int line,
 				      const char *err_fn,
diff -ur a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
--- a/fs/ext4/ialloc.c	2021-06-28 08:45:38.993956213 -0600
+++ b/fs/ext4/ialloc.c	2021-06-28 08:46:06.917523511 -0600
@@ -115,7 +115,7 @@
  *
  * Return buffer_head of bitmap on success, or an ERR_PTR on error.
  */
-static struct buffer_head *
+struct buffer_head *
 ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group)
 {
 	struct ext4_group_desc *desc;
@@ -214,6 +214,7 @@
 	put_bh(bh);
 	return ERR_PTR(err);
 }
+EXPORT_SYMBOL(ext4_read_inode_bitmap);
 
 /*
  * NOTE! When we get the inode, we're the only people
diff -ur a/fs/ext4/inode.c b/fs/ext4/inode.c
--- a/fs/ext4/inode.c	2021-06-28 08:45:39.069955021 -0600
+++ b/fs/ext4/inode.c	2021-06-28 08:46:06.921523449 -0600
@@ -6088,3 +6088,19 @@
 
 	return ret;
 }
+EXPORT_SYMBOL(ext4_map_blocks);
+EXPORT_SYMBOL(ext4_truncate);
+EXPORT_SYMBOL(ext4_iget);
+EXPORT_SYMBOL(ext4_bread);
+EXPORT_SYMBOL(ext4_itable_unused_count);
+EXPORT_SYMBOL(ext4_force_commit);
+EXPORT_SYMBOL(__ext4_mark_inode_dirty);
+EXPORT_SYMBOL(ext4_get_group_desc);
+EXPORT_SYMBOL(__ext4_journal_get_write_access);
+EXPORT_SYMBOL(__ext4_journal_start_sb);
+EXPORT_SYMBOL(__ext4_journal_stop);
+EXPORT_SYMBOL(__ext4_handle_dirty_metadata);
+EXPORT_SYMBOL(__ext4_std_error);
+EXPORT_SYMBOL(ext4fs_dirhash);
+EXPORT_SYMBOL(ext4_get_inode_loc);
+EXPORT_SYMBOL(ext4_chunk_trans_blocks);
diff -ur a/fs/ext4/namei.c b/fs/ext4/namei.c
--- a/fs/ext4/namei.c	2021-06-28 08:45:39.093954644 -0600
+++ b/fs/ext4/namei.c	2021-06-28 08:46:06.921523449 -0600
@@ -50,7 +50,7 @@
 #define NAMEI_RA_BLOCKS  4
 #define NAMEI_RA_SIZE	     (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
 
-static struct buffer_head *ext4_append(handle_t *handle,
+struct buffer_head *ext4_append(handle_t *handle,
 					struct inode *inode,
 					ext4_lblk_t *block)
 {
@@ -181,6 +181,7 @@
 	}
 	return bh;
 }
+EXPORT_SYMBOL(ext4_append);
 
 #ifndef assert
 #define assert(test) J_ASSERT(test)
@@ -2584,23 +2585,25 @@
  * for checking S_ISDIR(inode) (since the INODE_INDEX feature will not be set
  * on regular files) and to avoid creating huge/slow non-HTREE directories.
  */
-static void ext4_inc_count(handle_t *handle, struct inode *inode)
+void ext4_inc_count(handle_t *handle, struct inode *inode)
 {
 	inc_nlink(inode);
 	if (is_dx(inode) &&
 	    (inode->i_nlink > EXT4_LINK_MAX || inode->i_nlink == 2))
 		set_nlink(inode, 1);
 }
+EXPORT_SYMBOL(ext4_inc_count);
 
 /*
  * If a directory had nlink == 1, then we should let it be 1. This indicates
  * directory has >EXT4_LINK_MAX subdirs.
  */
-static void ext4_dec_count(handle_t *handle, struct inode *inode)
+void ext4_dec_count(handle_t *handle, struct inode *inode)
 {
 	if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2)
 		drop_nlink(inode);
 }
+EXPORT_SYMBOL(ext4_dec_count);
 
 
 /*
diff -ur a/fs/ext4/super.c b/fs/ext4/super.c
--- a/fs/ext4/super.c	2021-06-28 08:45:38.909957532 -0600
+++ b/fs/ext4/super.c	2021-06-28 08:46:06.921523449 -0600
@@ -348,7 +348,7 @@
 		return;
 	es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
 	ext4_update_tstamp(es, s_last_error_time);
-	strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
+	strlcpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
 	es->s_last_error_line = cpu_to_le32(line);
 	es->s_last_error_ino = cpu_to_le32(ino);
 	es->s_last_error_block = cpu_to_le64(block);
@@ -409,7 +409,7 @@
 	if (!es->s_first_error_time) {
 		es->s_first_error_time = es->s_last_error_time;
 		es->s_first_error_time_hi = es->s_last_error_time_hi;
-		strncpy(es->s_first_error_func, func,
+		strlcpy(es->s_first_error_func, func,
 			sizeof(es->s_first_error_func));
 		es->s_first_error_line = cpu_to_le32(line);
 		es->s_first_error_ino = es->s_last_error_ino;
@@ -6382,16 +6382,12 @@
 	err = init_inodecache();
 	if (err)
 		goto out1;
-	register_as_ext3();
-	register_as_ext2();
 	err = register_filesystem(&ext4_fs_type);
 	if (err)
 		goto out;
 
 	return 0;
 out:
-	unregister_as_ext2();
-	unregister_as_ext3();
 	destroy_inodecache();
 out1:
 	ext4_exit_mballoc();
@@ -6414,8 +6410,6 @@
 static void __exit ext4_exit_fs(void)
 {
 	ext4_destroy_lazyinit_thread();
-	unregister_as_ext2();
-	unregister_as_ext3();
 	unregister_filesystem(&ext4_fs_type);
 	destroy_inodecache();
 	ext4_exit_mballoc();