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ext4: Introduce ext4_lblk_t

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This patch adds a new data type ext4_lblk_t to represent
the logical file blocks.

This is the preparatory patch to support large files in ext4
The follow up patch with convert the ext4_inode i_blocks to
represent the number of blocks in file system block size. This
changes makes it possible to have a block number 2**32 -1 which
will result in overflow if the block number is represented by
signed long. This patch convert all the block number to type
ext4_lblk_t which is typedef to __u32

Also remove dead code ext4_ext_walk_space

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
This commit is contained in:
Aneesh Kumar K.V
2008-01-28 23:58:27 -05:00
committed by Theodore Ts'o
parent a72d7f834e
commit 725d26d3f0
8 changed files with 143 additions and 226 deletions
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29
include/linux/ext4_fs.h
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@@ -935,11 +935,14 @@ extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
/* inode.c */
int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
struct buffer_head *bh, ext4_fsblk_t blocknr);
struct buffer_head * ext4_getblk (handle_t *, struct inode *, long, int, int *);
struct buffer_head * ext4_bread (handle_t *, struct inode *, int, int, int *);
struct buffer_head *ext4_getblk(handle_t *, struct inode *,
ext4_lblk_t, int, int *);
struct buffer_head *ext4_bread(handle_t *, struct inode *,
ext4_lblk_t, int, int *);
int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
int create, int extend_disksize);
ext4_lblk_t iblock, unsigned long maxblocks,
struct buffer_head *bh_result,
int create, int extend_disksize);
extern void ext4_read_inode (struct inode *);
extern int ext4_write_inode (struct inode *, int);
@@ -1068,7 +1071,7 @@ extern const struct inode_operations ext4_fast_symlink_inode_operations;
extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
ext4_fsblk_t iblock,
ext4_lblk_t iblock,
unsigned long max_blocks, struct buffer_head *bh_result,
int create, int extend_disksize);
extern void ext4_ext_truncate(struct inode *, struct page *);
@@ -1081,11 +1084,17 @@ ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
unsigned long max_blocks, struct buffer_head *bh,
int create, int extend_disksize)
{
if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)
return ext4_ext_get_blocks(handle, inode, block, max_blocks,
bh, create, extend_disksize);
return ext4_get_blocks_handle(handle, inode, block, max_blocks, bh,
create, extend_disksize);
int retval;
if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) {
retval = ext4_ext_get_blocks(handle, inode,
(ext4_lblk_t)block, max_blocks,
bh, create, extend_disksize);
} else {
retval = ext4_get_blocks_handle(handle, inode,
(ext4_lblk_t)block, max_blocks,
bh, create, extend_disksize);
}
return retval;
}