[PATCH] ext3_fsblk_t: filesystem, group blocks and bug fixes

Some of the in-kernel ext3 block variable type are treated as signed 4 bytes
int type, thus limited ext3 filesystem to 8TB (4kblock size based).  While
trying to fix them, it seems quite confusing in the ext3 code where some
blocks are filesystem-wide blocks, some are group relative offsets that need
to be signed value (as -1 has special meaning).  So it seem saner to define
two types of physical blocks: one is filesystem wide blocks, another is
group-relative blocks.  The following patches clarify these two types of
blocks in the ext3 code, and fix the type bugs which limit current 32 bit ext3
filesystem limit to 8TB.

With this series of patches and the percpu counter data type changes in the mm
tree, we are able to extend exts filesystem limit to 16TB.

This work is also a pre-request for the recent >32 bit ext3 work, and makes
the kernel to able to address 48 bit ext3 block a lot easier: Simply redefine
ext3_fsblk_t from unsigned long to sector_t and redefine the format string for
ext3 filesystem block corresponding.

Two RFC with a series patches have been posted to ext2-devel list and have
been reviewed and discussed:
http://marc.theaimsgroup.com/?l=ext2-devel&m=114722190816690&w=2

http://marc.theaimsgroup.com/?l=ext2-devel&m=114784919525942&w=2

Patches are tested on both 32 bit machine and 64 bit machine, <8TB ext3 and
>8TB ext3 filesystem(with the latest to be released e2fsprogs-1.39).  Tests
includes overnight fsx, tiobench, dbench and fsstress.

This patch:

Defines ext3_fsblk_t and ext3_grpblk_t, and the printk format string for
filesystem wide blocks.

This patch classifies all block group relative blocks, and ext3_fsblk_t blocks
occurs in the same function where used to be confusing before.  Also include
kernel bug fixes for filesystem wide in-kernel block variables.  There are
some fileystem wide blocks are treated as int/unsigned int type in the kernel
currently, especially in ext3 block allocation and reservation code.  This
patch fixed those bugs by converting those variables to ext3_fsblk_t(unsigned
long) type.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 24 insertions, 19 deletions

diff --git a/fs/ext3/resize.c b/fs/ext3/resize.c
index a31dff81ed7..82c678e9268 100644
--- a/fs/ext3/resize.c
+++ b/fs/ext3/resize.c
@@ -28,16 +28,16 @@ static int verify_group_input(struct super_block *sb,
 {
 	struct ext3_sb_info *sbi = EXT3_SB(sb);
 	struct ext3_super_block *es = sbi->s_es;
-	unsigned start = le32_to_cpu(es->s_blocks_count);
-	unsigned end = start + input->blocks_count;
+	ext3_fsblk_t start = le32_to_cpu(es->s_blocks_count);
+	ext3_fsblk_t end = start + input->blocks_count;
 	unsigned group = input->group;
-	unsigned itend = input->inode_table + sbi->s_itb_per_group;
+	ext3_fsblk_t itend = input->inode_table + sbi->s_itb_per_group;
 	unsigned overhead = ext3_bg_has_super(sb, group) ?
 		(1 + ext3_bg_num_gdb(sb, group) +
 		 le16_to_cpu(es->s_reserved_gdt_blocks)) : 0;
-	unsigned metaend = start + overhead;
+	ext3_fsblk_t metaend = start + overhead;
 	struct buffer_head *bh = NULL;
-	int free_blocks_count;
+	ext3_grpblk_t free_blocks_count;
 	int err = -EINVAL;
 
 	input->free_blocks_count = free_blocks_count =
@@ -64,7 +64,8 @@ static int verify_group_input(struct super_block *sb,
 		ext3_warning(sb, __FUNCTION__, "Bad blocks count %u",
 			     input->blocks_count);
 	else if (!(bh = sb_bread(sb, end - 1)))
-		ext3_warning(sb, __FUNCTION__, "Cannot read last block (%u)",
+		ext3_warning(sb, __FUNCTION__,
+			     "Cannot read last block ("E3FSBLK")",
 			     end - 1);
 	else if (outside(input->block_bitmap, start, end))
 		ext3_warning(sb, __FUNCTION__,
@@ -77,7 +78,7 @@ static int verify_group_input(struct super_block *sb,
 	else if (outside(input->inode_table, start, end) ||
 	         outside(itend - 1, start, end))
 		ext3_warning(sb, __FUNCTION__,
-			     "Inode table not in group (blocks %u-%u)",
+			     "Inode table not in group (blocks %u-"E3FSBLK")",
 			     input->inode_table, itend - 1);
 	else if (input->inode_bitmap == input->block_bitmap)
 		ext3_warning(sb, __FUNCTION__,
@@ -85,24 +86,27 @@ static int verify_group_input(struct super_block *sb,
 			     input->block_bitmap);
 	else if (inside(input->block_bitmap, input->inode_table, itend))
 		ext3_warning(sb, __FUNCTION__,
-			     "Block bitmap (%u) in inode table (%u-%u)",
+			     "Block bitmap (%u) in inode table (%u-"E3FSBLK")",
 			     input->block_bitmap, input->inode_table, itend-1);
 	else if (inside(input->inode_bitmap, input->inode_table, itend))
 		ext3_warning(sb, __FUNCTION__,
-			     "Inode bitmap (%u) in inode table (%u-%u)",
+			     "Inode bitmap (%u) in inode table (%u-"E3FSBLK")",
 			     input->inode_bitmap, input->inode_table, itend-1);
 	else if (inside(input->block_bitmap, start, metaend))
 		ext3_warning(sb, __FUNCTION__,
-			     "Block bitmap (%u) in GDT table (%u-%u)",
+			     "Block bitmap (%u) in GDT table"
+			     " ("E3FSBLK"-"E3FSBLK")",
 			     input->block_bitmap, start, metaend - 1);
 	else if (inside(input->inode_bitmap, start, metaend))
 		ext3_warning(sb, __FUNCTION__,
-			     "Inode bitmap (%u) in GDT table (%u-%u)",
+			     "Inode bitmap (%u) in GDT table"
+			     " ("E3FSBLK"-"E3FSBLK")",
 			     input->inode_bitmap, start, metaend - 1);
 	else if (inside(input->inode_table, start, metaend) ||
 	         inside(itend - 1, start, metaend))
 		ext3_warning(sb, __FUNCTION__,
-			     "Inode table (%u-%u) overlaps GDT table (%u-%u)",
+			     "Inode table (%u-"E3FSBLK") overlaps"
+			     "GDT table ("E3FSBLK"-"E3FSBLK")",
 			     input->inode_table, itend - 1, start, metaend - 1);
 	else
 		err = 0;
@@ -171,7 +175,7 @@ static int setup_new_group_blocks(struct super_block *sb,
 	struct buffer_head *bh;
 	handle_t *handle;
 	unsigned long block;
-	int bit;
+	ext3_grpblk_t bit;
 	int i;
 	int err = 0, err2;
 
@@ -340,7 +344,7 @@ static int verify_reserved_gdb(struct super_block *sb,
 	while ((grp = ext3_list_backups(sb, &three, &five, &seven)) < end) {
 		if (le32_to_cpu(*p++) != grp * EXT3_BLOCKS_PER_GROUP(sb) + blk){
 			ext3_warning(sb, __FUNCTION__,
-				     "reserved GDT %ld missing grp %d (%ld)",
+				     "reserved GDT %lu missing grp %d (%lu)",
 				     blk, grp,
 				     grp * EXT3_BLOCKS_PER_GROUP(sb) + blk);
 			return -EINVAL;
@@ -906,11 +910,12 @@ int ext3_group_extend(struct super_block *sb, struct ext3_super_block *es,
 {
 	unsigned long o_blocks_count;
 	unsigned long o_groups_count;
-	unsigned long last;
-	int add;
+	ext3_grpblk_t last;
+	ext3_grpblk_t add;
 	struct buffer_head * bh;
 	handle_t *handle;
-	int err, freed_blocks;
+	int err;
+	unsigned long freed_blocks;
 
 	/* We don't need to worry about locking wrt other resizers just
 	 * yet: we're going to revalidate es->s_blocks_count after
@@ -1001,10 +1006,10 @@ int ext3_group_extend(struct super_block *sb, struct ext3_super_block *es,
 	ext3_journal_dirty_metadata(handle, EXT3_SB(sb)->s_sbh);
 	sb->s_dirt = 1;
 	unlock_super(sb);
-	ext3_debug("freeing blocks %ld through %ld\n", o_blocks_count,
+	ext3_debug("freeing blocks %lu through %lu\n", o_blocks_count,
 		   o_blocks_count + add);
 	ext3_free_blocks_sb(handle, sb, o_blocks_count, add, &freed_blocks);
-	ext3_debug("freed blocks %ld through %ld\n", o_blocks_count,
+	ext3_debug("freed blocks %lu through %lu\n", o_blocks_count,
 		   o_blocks_count + add);
 	if ((err = ext3_journal_stop(handle)))
 		goto exit_put;