[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>

2 files changed, 19 insertions, 8 deletions

diff --git a/include/linux/ext3_fs.h b/include/linux/ext3_fs.h
index 757d54d8f1a5..34136ff02aca 100644
--- a/include/linux/ext3_fs.h
+++ b/include/linux/ext3_fs.h
@@ -730,13 +730,15 @@ struct dir_private_info {
 /* balloc.c */
 extern int ext3_bg_has_super(struct super_block *sb, int group);
 extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
-extern int ext3_new_block (handle_t *, struct inode *, unsigned long, int *);
-extern int ext3_new_blocks (handle_t *, struct inode *, unsigned long,
-                        unsigned long *, int *);
-extern void ext3_free_blocks (handle_t *, struct inode *, unsigned long,
-                              unsigned long);
-extern void ext3_free_blocks_sb (handle_t *, struct super_block *,
-                                 unsigned long, unsigned long, int *);
+extern ext3_fsblk_t ext3_new_block (handle_t *handle, struct inode *inode,
+                        ext3_fsblk_t goal, int *errp);
+extern ext3_fsblk_t ext3_new_blocks (handle_t *handle, struct inode *inode,
+                        ext3_fsblk_t goal, unsigned long *count, int *errp);
+extern void ext3_free_blocks (handle_t *handle, struct inode *inode,
+                        ext3_fsblk_t block, unsigned long count);
+extern void ext3_free_blocks_sb (handle_t *handle, struct super_block *sb,
+                                 ext3_fsblk_t block, unsigned long count,
+                                unsigned long *pdquot_freed_blocks);
 extern unsigned long ext3_count_free_blocks (struct super_block *);
 extern void ext3_check_blocks_bitmap (struct super_block *);
 extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
@@ -773,7 +775,8 @@ extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
 
 
 /* inode.c */
-int ext3_forget(handle_t *, int, struct inode *, struct buffer_head *, int);
+int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode,
+                struct buffer_head *bh, ext3_fsblk_t blocknr);
 struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
 struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
 int ext3_get_blocks_handle(handle_t *handle, struct inode *inode,
diff --git a/include/linux/ext3_fs_i.h b/include/linux/ext3_fs_i.h
index 7abf90147180..e1c7509c0c9f 100644
--- a/include/linux/ext3_fs_i.h
+++ b/include/linux/ext3_fs_i.h
@@ -21,6 +21,14 @@
 #include <linux/seqlock.h>
 #include <linux/mutex.h>
 
+/* data type for block offset of block group */
+typedef int ext3_grpblk_t;
+
+/* data type for filesystem-wide blocks number */
+typedef unsigned long ext3_fsblk_t;
+
+#define E3FSBLK "%lu"
+
 struct ext3_reserve_window {
         __u32                   _rsv_start;     /* First byte reserved */
         __u32                   _rsv_end;       /* Last byte reserved or 0 */